clang  3.7.0
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 "CodeGenFunction.h"
19 #include "CodeGenModule.h"
20 #include "clang/AST/ASTContext.h"
21 #include "clang/AST/DeclFriend.h"
22 #include "clang/AST/DeclObjC.h"
23 #include "clang/AST/DeclTemplate.h"
24 #include "clang/AST/Expr.h"
25 #include "clang/AST/RecordLayout.h"
28 #include "clang/Basic/Version.h"
32 #include "llvm/ADT/SmallVector.h"
33 #include "llvm/ADT/StringExtras.h"
34 #include "llvm/IR/Constants.h"
35 #include "llvm/IR/DataLayout.h"
36 #include "llvm/IR/DerivedTypes.h"
37 #include "llvm/IR/Instructions.h"
38 #include "llvm/IR/Intrinsics.h"
39 #include "llvm/IR/Module.h"
40 #include "llvm/Support/Dwarf.h"
41 #include "llvm/Support/FileSystem.h"
42 #include "llvm/Support/Path.h"
43 using namespace clang;
44 using namespace clang::CodeGen;
45 
47  : CGM(CGM), DebugKind(CGM.getCodeGenOpts().getDebugInfo()),
48  DBuilder(CGM.getModule()) {
49  CreateCompileUnit();
50 }
51 
53  assert(LexicalBlockStack.empty() &&
54  "Region stack mismatch, stack not empty!");
55 }
56 
57 ApplyDebugLocation::ApplyDebugLocation(CodeGenFunction &CGF,
58  SourceLocation TemporaryLocation)
59  : CGF(CGF) {
60  init(TemporaryLocation);
61 }
62 
63 ApplyDebugLocation::ApplyDebugLocation(CodeGenFunction &CGF,
64  bool DefaultToEmpty,
65  SourceLocation TemporaryLocation)
66  : CGF(CGF) {
67  init(TemporaryLocation, DefaultToEmpty);
68 }
69 
70 void ApplyDebugLocation::init(SourceLocation TemporaryLocation,
71  bool DefaultToEmpty) {
72  if (auto *DI = CGF.getDebugInfo()) {
73  OriginalLocation = CGF.Builder.getCurrentDebugLocation();
74  if (TemporaryLocation.isInvalid()) {
75  if (DefaultToEmpty)
76  CGF.Builder.SetCurrentDebugLocation(llvm::DebugLoc());
77  else {
78  // Construct a location that has a valid scope, but no line info.
79  assert(!DI->LexicalBlockStack.empty());
80  CGF.Builder.SetCurrentDebugLocation(
81  llvm::DebugLoc::get(0, 0, DI->LexicalBlockStack.back()));
82  }
83  } else
84  DI->EmitLocation(CGF.Builder, TemporaryLocation);
85  }
86 }
87 
88 ApplyDebugLocation::ApplyDebugLocation(CodeGenFunction &CGF, const Expr *E)
89  : CGF(CGF) {
90  init(E->getExprLoc());
91 }
92 
93 ApplyDebugLocation::ApplyDebugLocation(CodeGenFunction &CGF, llvm::DebugLoc Loc)
94  : CGF(CGF) {
95  if (CGF.getDebugInfo()) {
96  OriginalLocation = CGF.Builder.getCurrentDebugLocation();
97  if (Loc)
98  CGF.Builder.SetCurrentDebugLocation(std::move(Loc));
99  }
100 }
101 
103  // Query CGF so the location isn't overwritten when location updates are
104  // temporarily disabled (for C++ default function arguments)
105  if (CGF.getDebugInfo())
106  CGF.Builder.SetCurrentDebugLocation(std::move(OriginalLocation));
107 }
108 
110  // If the new location isn't valid return.
111  if (Loc.isInvalid())
112  return;
113 
114  CurLoc = CGM.getContext().getSourceManager().getExpansionLoc(Loc);
115 
116  // If we've changed files in the middle of a lexical scope go ahead
117  // and create a new lexical scope with file node if it's different
118  // from the one in the scope.
119  if (LexicalBlockStack.empty())
120  return;
121 
123  auto *Scope = cast<llvm::DIScope>(LexicalBlockStack.back());
124  PresumedLoc PCLoc = SM.getPresumedLoc(CurLoc);
125 
126  if (PCLoc.isInvalid() || Scope->getFilename() == PCLoc.getFilename())
127  return;
128 
129  if (auto *LBF = dyn_cast<llvm::DILexicalBlockFile>(Scope)) {
130  LexicalBlockStack.pop_back();
131  LexicalBlockStack.emplace_back(DBuilder.createLexicalBlockFile(
132  LBF->getScope(), getOrCreateFile(CurLoc)));
133  } else if (isa<llvm::DILexicalBlock>(Scope) ||
134  isa<llvm::DISubprogram>(Scope)) {
135  LexicalBlockStack.pop_back();
136  LexicalBlockStack.emplace_back(
137  DBuilder.createLexicalBlockFile(Scope, getOrCreateFile(CurLoc)));
138  }
139 }
140 
141 llvm::DIScope *CGDebugInfo::getContextDescriptor(const Decl *Context) {
142  if (!Context)
143  return TheCU;
144 
145  auto I = RegionMap.find(Context);
146  if (I != RegionMap.end()) {
147  llvm::Metadata *V = I->second;
148  return dyn_cast_or_null<llvm::DIScope>(V);
149  }
150 
151  // Check namespace.
152  if (const NamespaceDecl *NSDecl = dyn_cast<NamespaceDecl>(Context))
153  return getOrCreateNameSpace(NSDecl);
154 
155  if (const RecordDecl *RDecl = dyn_cast<RecordDecl>(Context))
156  if (!RDecl->isDependentType())
157  return getOrCreateType(CGM.getContext().getTypeDeclType(RDecl),
158  getOrCreateMainFile());
159  return TheCU;
160 }
161 
162 StringRef CGDebugInfo::getFunctionName(const FunctionDecl *FD) {
163  assert(FD && "Invalid FunctionDecl!");
164  IdentifierInfo *FII = FD->getIdentifier();
167  if (!Info && FII)
168  return FII->getName();
169 
170  // Otherwise construct human readable name for debug info.
171  SmallString<128> NS;
172  llvm::raw_svector_ostream OS(NS);
173  FD->printName(OS);
174 
175  // Add any template specialization args.
176  if (Info) {
177  const TemplateArgumentList *TArgs = Info->TemplateArguments;
178  const TemplateArgument *Args = TArgs->data();
179  unsigned NumArgs = TArgs->size();
180  PrintingPolicy Policy(CGM.getLangOpts());
182  Policy);
183  }
184 
185  // Copy this name on the side and use its reference.
186  return internString(OS.str());
187 }
188 
189 StringRef CGDebugInfo::getObjCMethodName(const ObjCMethodDecl *OMD) {
190  SmallString<256> MethodName;
191  llvm::raw_svector_ostream OS(MethodName);
192  OS << (OMD->isInstanceMethod() ? '-' : '+') << '[';
193  const DeclContext *DC = OMD->getDeclContext();
194  if (const ObjCImplementationDecl *OID =
195  dyn_cast<const ObjCImplementationDecl>(DC)) {
196  OS << OID->getName();
197  } else if (const ObjCInterfaceDecl *OID =
198  dyn_cast<const ObjCInterfaceDecl>(DC)) {
199  OS << OID->getName();
200  } else if (const ObjCCategoryImplDecl *OCD =
201  dyn_cast<const ObjCCategoryImplDecl>(DC)) {
202  OS << ((const NamedDecl *)OCD)->getIdentifier()->getNameStart() << '('
203  << OCD->getIdentifier()->getNameStart() << ')';
204  } else if (isa<ObjCProtocolDecl>(DC)) {
205  // We can extract the type of the class from the self pointer.
206  if (ImplicitParamDecl *SelfDecl = OMD->getSelfDecl()) {
207  QualType ClassTy =
208  cast<ObjCObjectPointerType>(SelfDecl->getType())->getPointeeType();
209  ClassTy.print(OS, PrintingPolicy(LangOptions()));
210  }
211  }
212  OS << ' ' << OMD->getSelector().getAsString() << ']';
213 
214  return internString(OS.str());
215 }
216 
217 StringRef CGDebugInfo::getSelectorName(Selector S) {
218  return internString(S.getAsString());
219 }
220 
221 StringRef CGDebugInfo::getClassName(const RecordDecl *RD) {
222  // quick optimization to avoid having to intern strings that are already
223  // stored reliably elsewhere
224  if (!isa<ClassTemplateSpecializationDecl>(RD))
225  return RD->getName();
226 
227  SmallString<128> Name;
228  {
229  llvm::raw_svector_ostream OS(Name);
231  /*Qualified*/ false);
232  }
233 
234  // Copy this name on the side and use its reference.
235  return internString(Name);
236 }
237 
238 llvm::DIFile *CGDebugInfo::getOrCreateFile(SourceLocation Loc) {
239  if (!Loc.isValid())
240  // If Location is not valid then use main input file.
241  return DBuilder.createFile(TheCU->getFilename(), TheCU->getDirectory());
242 
244  PresumedLoc PLoc = SM.getPresumedLoc(Loc);
245 
246  if (PLoc.isInvalid() || StringRef(PLoc.getFilename()).empty())
247  // If the location is not valid then use main input file.
248  return DBuilder.createFile(TheCU->getFilename(), TheCU->getDirectory());
249 
250  // Cache the results.
251  const char *fname = PLoc.getFilename();
252  auto it = DIFileCache.find(fname);
253 
254  if (it != DIFileCache.end()) {
255  // Verify that the information still exists.
256  if (llvm::Metadata *V = it->second)
257  return cast<llvm::DIFile>(V);
258  }
259 
260  llvm::DIFile *F =
261  DBuilder.createFile(PLoc.getFilename(), getCurrentDirname());
262 
263  DIFileCache[fname].reset(F);
264  return F;
265 }
266 
267 llvm::DIFile *CGDebugInfo::getOrCreateMainFile() {
268  return DBuilder.createFile(TheCU->getFilename(), TheCU->getDirectory());
269 }
270 
271 unsigned CGDebugInfo::getLineNumber(SourceLocation Loc) {
272  if (Loc.isInvalid() && CurLoc.isInvalid())
273  return 0;
275  PresumedLoc PLoc = SM.getPresumedLoc(Loc.isValid() ? Loc : CurLoc);
276  return PLoc.isValid() ? PLoc.getLine() : 0;
277 }
278 
279 unsigned CGDebugInfo::getColumnNumber(SourceLocation Loc, bool Force) {
280  // We may not want column information at all.
281  if (!Force && !CGM.getCodeGenOpts().DebugColumnInfo)
282  return 0;
283 
284  // If the location is invalid then use the current column.
285  if (Loc.isInvalid() && CurLoc.isInvalid())
286  return 0;
288  PresumedLoc PLoc = SM.getPresumedLoc(Loc.isValid() ? Loc : CurLoc);
289  return PLoc.isValid() ? PLoc.getColumn() : 0;
290 }
291 
292 StringRef CGDebugInfo::getCurrentDirname() {
293  if (!CGM.getCodeGenOpts().DebugCompilationDir.empty())
294  return CGM.getCodeGenOpts().DebugCompilationDir;
295 
296  if (!CWDName.empty())
297  return CWDName;
298  SmallString<256> CWD;
299  llvm::sys::fs::current_path(CWD);
300  return CWDName = internString(CWD);
301 }
302 
303 void CGDebugInfo::CreateCompileUnit() {
304 
305  // Should we be asking the SourceManager for the main file name, instead of
306  // accepting it as an argument? This just causes the main file name to
307  // mismatch with source locations and create extra lexical scopes or
308  // mismatched debug info (a CU with a DW_AT_file of "-", because that's what
309  // the driver passed, but functions/other things have DW_AT_file of "<stdin>"
310  // because that's what the SourceManager says)
311 
312  // Get absolute path name.
314  std::string MainFileName = CGM.getCodeGenOpts().MainFileName;
315  if (MainFileName.empty())
316  MainFileName = "<stdin>";
317 
318  // The main file name provided via the "-main-file-name" option contains just
319  // the file name itself with no path information. This file name may have had
320  // a relative path, so we look into the actual file entry for the main
321  // file to determine the real absolute path for the file.
322  std::string MainFileDir;
323  if (const FileEntry *MainFile = SM.getFileEntryForID(SM.getMainFileID())) {
324  MainFileDir = MainFile->getDir()->getName();
325  if (MainFileDir != ".") {
326  llvm::SmallString<1024> MainFileDirSS(MainFileDir);
327  llvm::sys::path::append(MainFileDirSS, MainFileName);
328  MainFileName = MainFileDirSS.str();
329  }
330  }
331 
332  // Save filename string.
333  StringRef Filename = internString(MainFileName);
334 
335  // Save split dwarf file string.
336  std::string SplitDwarfFile = CGM.getCodeGenOpts().SplitDwarfFile;
337  StringRef SplitDwarfFilename = internString(SplitDwarfFile);
338 
339  llvm::dwarf::SourceLanguage LangTag;
340  const LangOptions &LO = CGM.getLangOpts();
341  if (LO.CPlusPlus) {
342  if (LO.ObjC1)
343  LangTag = llvm::dwarf::DW_LANG_ObjC_plus_plus;
344  else
345  LangTag = llvm::dwarf::DW_LANG_C_plus_plus;
346  } else if (LO.ObjC1) {
347  LangTag = llvm::dwarf::DW_LANG_ObjC;
348  } else if (LO.C99) {
349  LangTag = llvm::dwarf::DW_LANG_C99;
350  } else {
351  LangTag = llvm::dwarf::DW_LANG_C89;
352  }
353 
354  std::string Producer = getClangFullVersion();
355 
356  // Figure out which version of the ObjC runtime we have.
357  unsigned RuntimeVers = 0;
358  if (LO.ObjC1)
359  RuntimeVers = LO.ObjCRuntime.isNonFragile() ? 2 : 1;
360 
361  // Create new compile unit.
362  // FIXME - Eliminate TheCU.
363  TheCU = DBuilder.createCompileUnit(
364  LangTag, Filename, getCurrentDirname(), Producer, LO.Optimize,
365  CGM.getCodeGenOpts().DwarfDebugFlags, RuntimeVers, SplitDwarfFilename,
367  ? llvm::DIBuilder::LineTablesOnly
368  : llvm::DIBuilder::FullDebug,
369  0 /* DWOid */,
370  DebugKind != CodeGenOptions::LocTrackingOnly);
371 }
372 
373 llvm::DIType *CGDebugInfo::CreateType(const BuiltinType *BT) {
374  llvm::dwarf::TypeKind Encoding;
375  StringRef BTName;
376  switch (BT->getKind()) {
377 #define BUILTIN_TYPE(Id, SingletonId)
378 #define PLACEHOLDER_TYPE(Id, SingletonId) case BuiltinType::Id:
379 #include "clang/AST/BuiltinTypes.def"
380  case BuiltinType::Dependent:
381  llvm_unreachable("Unexpected builtin type");
382  case BuiltinType::NullPtr:
383  return DBuilder.createNullPtrType();
384  case BuiltinType::Void:
385  return nullptr;
386  case BuiltinType::ObjCClass:
387  if (!ClassTy)
388  ClassTy = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
389  "objc_class", TheCU,
390  getOrCreateMainFile(), 0);
391  return ClassTy;
392  case BuiltinType::ObjCId: {
393  // typedef struct objc_class *Class;
394  // typedef struct objc_object {
395  // Class isa;
396  // } *id;
397 
398  if (ObjTy)
399  return ObjTy;
400 
401  if (!ClassTy)
402  ClassTy = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
403  "objc_class", TheCU,
404  getOrCreateMainFile(), 0);
405 
406  unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
407 
408  auto *ISATy = DBuilder.createPointerType(ClassTy, Size);
409 
410  ObjTy =
411  DBuilder.createStructType(TheCU, "objc_object", getOrCreateMainFile(),
412  0, 0, 0, 0, nullptr, llvm::DINodeArray());
413 
414  DBuilder.replaceArrays(
415  ObjTy,
416  DBuilder.getOrCreateArray(&*DBuilder.createMemberType(
417  ObjTy, "isa", getOrCreateMainFile(), 0, Size, 0, 0, 0, ISATy)));
418  return ObjTy;
419  }
420  case BuiltinType::ObjCSel: {
421  if (!SelTy)
422  SelTy = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
423  "objc_selector", TheCU,
424  getOrCreateMainFile(), 0);
425  return SelTy;
426  }
427 
428  case BuiltinType::OCLImage1d:
429  return getOrCreateStructPtrType("opencl_image1d_t", OCLImage1dDITy);
430  case BuiltinType::OCLImage1dArray:
431  return getOrCreateStructPtrType("opencl_image1d_array_t",
432  OCLImage1dArrayDITy);
433  case BuiltinType::OCLImage1dBuffer:
434  return getOrCreateStructPtrType("opencl_image1d_buffer_t",
435  OCLImage1dBufferDITy);
436  case BuiltinType::OCLImage2d:
437  return getOrCreateStructPtrType("opencl_image2d_t", OCLImage2dDITy);
438  case BuiltinType::OCLImage2dArray:
439  return getOrCreateStructPtrType("opencl_image2d_array_t",
440  OCLImage2dArrayDITy);
441  case BuiltinType::OCLImage3d:
442  return getOrCreateStructPtrType("opencl_image3d_t", OCLImage3dDITy);
443  case BuiltinType::OCLSampler:
444  return DBuilder.createBasicType(
445  "opencl_sampler_t", CGM.getContext().getTypeSize(BT),
446  CGM.getContext().getTypeAlign(BT), llvm::dwarf::DW_ATE_unsigned);
447  case BuiltinType::OCLEvent:
448  return getOrCreateStructPtrType("opencl_event_t", OCLEventDITy);
449 
450  case BuiltinType::UChar:
451  case BuiltinType::Char_U:
452  Encoding = llvm::dwarf::DW_ATE_unsigned_char;
453  break;
454  case BuiltinType::Char_S:
455  case BuiltinType::SChar:
456  Encoding = llvm::dwarf::DW_ATE_signed_char;
457  break;
458  case BuiltinType::Char16:
459  case BuiltinType::Char32:
460  Encoding = llvm::dwarf::DW_ATE_UTF;
461  break;
462  case BuiltinType::UShort:
463  case BuiltinType::UInt:
464  case BuiltinType::UInt128:
465  case BuiltinType::ULong:
466  case BuiltinType::WChar_U:
467  case BuiltinType::ULongLong:
468  Encoding = llvm::dwarf::DW_ATE_unsigned;
469  break;
470  case BuiltinType::Short:
471  case BuiltinType::Int:
472  case BuiltinType::Int128:
473  case BuiltinType::Long:
474  case BuiltinType::WChar_S:
475  case BuiltinType::LongLong:
476  Encoding = llvm::dwarf::DW_ATE_signed;
477  break;
478  case BuiltinType::Bool:
479  Encoding = llvm::dwarf::DW_ATE_boolean;
480  break;
481  case BuiltinType::Half:
482  case BuiltinType::Float:
483  case BuiltinType::LongDouble:
484  case BuiltinType::Double:
485  Encoding = llvm::dwarf::DW_ATE_float;
486  break;
487  }
488 
489  switch (BT->getKind()) {
490  case BuiltinType::Long:
491  BTName = "long int";
492  break;
493  case BuiltinType::LongLong:
494  BTName = "long long int";
495  break;
496  case BuiltinType::ULong:
497  BTName = "long unsigned int";
498  break;
499  case BuiltinType::ULongLong:
500  BTName = "long long unsigned int";
501  break;
502  default:
503  BTName = BT->getName(CGM.getLangOpts());
504  break;
505  }
506  // Bit size, align and offset of the type.
507  uint64_t Size = CGM.getContext().getTypeSize(BT);
508  uint64_t Align = CGM.getContext().getTypeAlign(BT);
509  return DBuilder.createBasicType(BTName, Size, Align, Encoding);
510 }
511 
512 llvm::DIType *CGDebugInfo::CreateType(const ComplexType *Ty) {
513  // Bit size, align and offset of the type.
514  llvm::dwarf::TypeKind Encoding = llvm::dwarf::DW_ATE_complex_float;
515  if (Ty->isComplexIntegerType())
516  Encoding = llvm::dwarf::DW_ATE_lo_user;
517 
518  uint64_t Size = CGM.getContext().getTypeSize(Ty);
519  uint64_t Align = CGM.getContext().getTypeAlign(Ty);
520  return DBuilder.createBasicType("complex", Size, Align, Encoding);
521 }
522 
523 llvm::DIType *CGDebugInfo::CreateQualifiedType(QualType Ty,
524  llvm::DIFile *Unit) {
526  const Type *T = Qc.strip(Ty);
527 
528  // Ignore these qualifiers for now.
529  Qc.removeObjCGCAttr();
530  Qc.removeAddressSpace();
531  Qc.removeObjCLifetime();
532 
533  // We will create one Derived type for one qualifier and recurse to handle any
534  // additional ones.
535  llvm::dwarf::Tag Tag;
536  if (Qc.hasConst()) {
537  Tag = llvm::dwarf::DW_TAG_const_type;
538  Qc.removeConst();
539  } else if (Qc.hasVolatile()) {
540  Tag = llvm::dwarf::DW_TAG_volatile_type;
541  Qc.removeVolatile();
542  } else if (Qc.hasRestrict()) {
543  Tag = llvm::dwarf::DW_TAG_restrict_type;
544  Qc.removeRestrict();
545  } else {
546  assert(Qc.empty() && "Unknown type qualifier for debug info");
547  return getOrCreateType(QualType(T, 0), Unit);
548  }
549 
550  auto *FromTy = getOrCreateType(Qc.apply(CGM.getContext(), T), Unit);
551 
552  // No need to fill in the Name, Line, Size, Alignment, Offset in case of
553  // CVR derived types.
554  return DBuilder.createQualifiedType(Tag, FromTy);
555 }
556 
557 llvm::DIType *CGDebugInfo::CreateType(const ObjCObjectPointerType *Ty,
558  llvm::DIFile *Unit) {
559 
560  // The frontend treats 'id' as a typedef to an ObjCObjectType,
561  // whereas 'id<protocol>' is treated as an ObjCPointerType. For the
562  // debug info, we want to emit 'id' in both cases.
563  if (Ty->isObjCQualifiedIdType())
564  return getOrCreateType(CGM.getContext().getObjCIdType(), Unit);
565 
566  return CreatePointerLikeType(llvm::dwarf::DW_TAG_pointer_type, Ty,
567  Ty->getPointeeType(), Unit);
568 }
569 
570 llvm::DIType *CGDebugInfo::CreateType(const PointerType *Ty,
571  llvm::DIFile *Unit) {
572  return CreatePointerLikeType(llvm::dwarf::DW_TAG_pointer_type, Ty,
573  Ty->getPointeeType(), Unit);
574 }
575 
576 /// \return whether a C++ mangling exists for the type defined by TD.
577 static bool hasCXXMangling(const TagDecl *TD, llvm::DICompileUnit *TheCU) {
578  switch (TheCU->getSourceLanguage()) {
579  case llvm::dwarf::DW_LANG_C_plus_plus:
580  return true;
581  case llvm::dwarf::DW_LANG_ObjC_plus_plus:
582  return isa<CXXRecordDecl>(TD) || isa<EnumDecl>(TD);
583  default:
584  return false;
585  }
586 }
587 
588 /// In C++ mode, types have linkage, so we can rely on the ODR and
589 /// on their mangled names, if they're external.
590 static SmallString<256> getUniqueTagTypeName(const TagType *Ty,
591  CodeGenModule &CGM,
592  llvm::DICompileUnit *TheCU) {
593  SmallString<256> FullName;
594  const TagDecl *TD = Ty->getDecl();
595 
596  if (!hasCXXMangling(TD, TheCU) || !TD->isExternallyVisible())
597  return FullName;
598 
599  // Microsoft Mangler does not have support for mangleCXXRTTIName yet.
600  if (CGM.getTarget().getCXXABI().isMicrosoft())
601  return FullName;
602 
603  // TODO: This is using the RTTI name. Is there a better way to get
604  // a unique string for a type?
605  llvm::raw_svector_ostream Out(FullName);
607  Out.flush();
608  return FullName;
609 }
610 
611 /// \return the approproate DWARF tag for a composite type.
612 static llvm::dwarf::Tag getTagForRecord(const RecordDecl *RD) {
613  llvm::dwarf::Tag Tag;
614  if (RD->isStruct() || RD->isInterface())
615  Tag = llvm::dwarf::DW_TAG_structure_type;
616  else if (RD->isUnion())
617  Tag = llvm::dwarf::DW_TAG_union_type;
618  else {
619  // FIXME: This could be a struct type giving a default visibility different
620  // than C++ class type, but needs llvm metadata changes first.
621  assert(RD->isClass());
622  Tag = llvm::dwarf::DW_TAG_class_type;
623  }
624  return Tag;
625 }
626 
627 llvm::DICompositeType *
628 CGDebugInfo::getOrCreateRecordFwdDecl(const RecordType *Ty,
629  llvm::DIScope *Ctx) {
630  const RecordDecl *RD = Ty->getDecl();
631  if (llvm::DIType *T = getTypeOrNull(CGM.getContext().getRecordType(RD)))
632  return cast<llvm::DICompositeType>(T);
633  llvm::DIFile *DefUnit = getOrCreateFile(RD->getLocation());
634  unsigned Line = getLineNumber(RD->getLocation());
635  StringRef RDName = getClassName(RD);
636 
637  uint64_t Size = 0;
638  uint64_t Align = 0;
639 
640  const RecordDecl *D = RD->getDefinition();
641  if (D && D->isCompleteDefinition()) {
642  Size = CGM.getContext().getTypeSize(Ty);
643  Align = CGM.getContext().getTypeAlign(Ty);
644  }
645 
646  // Create the type.
647  SmallString<256> FullName = getUniqueTagTypeName(Ty, CGM, TheCU);
648  llvm::DICompositeType *RetTy = DBuilder.createReplaceableCompositeType(
649  getTagForRecord(RD), RDName, Ctx, DefUnit, Line, 0, Size, Align,
650  llvm::DINode::FlagFwdDecl, FullName);
651  ReplaceMap.emplace_back(
652  std::piecewise_construct, std::make_tuple(Ty),
653  std::make_tuple(static_cast<llvm::Metadata *>(RetTy)));
654  return RetTy;
655 }
656 
657 llvm::DIType *CGDebugInfo::CreatePointerLikeType(llvm::dwarf::Tag Tag,
658  const Type *Ty,
659  QualType PointeeTy,
660  llvm::DIFile *Unit) {
661  if (Tag == llvm::dwarf::DW_TAG_reference_type ||
662  Tag == llvm::dwarf::DW_TAG_rvalue_reference_type)
663  return DBuilder.createReferenceType(Tag, getOrCreateType(PointeeTy, Unit));
664 
665  // Bit size, align and offset of the type.
666  // Size is always the size of a pointer. We can't use getTypeSize here
667  // because that does not return the correct value for references.
668  unsigned AS = CGM.getContext().getTargetAddressSpace(PointeeTy);
669  uint64_t Size = CGM.getTarget().getPointerWidth(AS);
670  uint64_t Align = CGM.getContext().getTypeAlign(Ty);
671 
672  return DBuilder.createPointerType(getOrCreateType(PointeeTy, Unit), Size,
673  Align);
674 }
675 
676 llvm::DIType *CGDebugInfo::getOrCreateStructPtrType(StringRef Name,
677  llvm::DIType *&Cache) {
678  if (Cache)
679  return Cache;
680  Cache = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type, Name,
681  TheCU, getOrCreateMainFile(), 0);
682  unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
683  Cache = DBuilder.createPointerType(Cache, Size);
684  return Cache;
685 }
686 
687 llvm::DIType *CGDebugInfo::CreateType(const BlockPointerType *Ty,
688  llvm::DIFile *Unit) {
690  QualType FType;
691  uint64_t FieldSize, FieldOffset;
692  unsigned FieldAlign;
693  llvm::DINodeArray Elements;
694 
695  FieldOffset = 0;
696  FType = CGM.getContext().UnsignedLongTy;
697  EltTys.push_back(CreateMemberType(Unit, FType, "reserved", &FieldOffset));
698  EltTys.push_back(CreateMemberType(Unit, FType, "Size", &FieldOffset));
699 
700  Elements = DBuilder.getOrCreateArray(EltTys);
701  EltTys.clear();
702 
703  unsigned Flags = llvm::DINode::FlagAppleBlock;
704  unsigned LineNo = 0;
705 
706  auto *EltTy =
707  DBuilder.createStructType(Unit, "__block_descriptor", nullptr, LineNo,
708  FieldOffset, 0, Flags, nullptr, Elements);
709 
710  // Bit size, align and offset of the type.
711  uint64_t Size = CGM.getContext().getTypeSize(Ty);
712 
713  auto *DescTy = DBuilder.createPointerType(EltTy, Size);
714 
715  FieldOffset = 0;
716  FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
717  EltTys.push_back(CreateMemberType(Unit, FType, "__isa", &FieldOffset));
718  FType = CGM.getContext().IntTy;
719  EltTys.push_back(CreateMemberType(Unit, FType, "__flags", &FieldOffset));
720  EltTys.push_back(CreateMemberType(Unit, FType, "__reserved", &FieldOffset));
721  FType = CGM.getContext().getPointerType(Ty->getPointeeType());
722  EltTys.push_back(CreateMemberType(Unit, FType, "__FuncPtr", &FieldOffset));
723 
724  FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
725  FieldSize = CGM.getContext().getTypeSize(Ty);
726  FieldAlign = CGM.getContext().getTypeAlign(Ty);
727  EltTys.push_back(DBuilder.createMemberType(Unit, "__descriptor", nullptr, LineNo,
728  FieldSize, FieldAlign, FieldOffset,
729  0, DescTy));
730 
731  FieldOffset += FieldSize;
732  Elements = DBuilder.getOrCreateArray(EltTys);
733 
734  // The __block_literal_generic structs are marked with a special
735  // DW_AT_APPLE_BLOCK attribute and are an implementation detail only
736  // the debugger needs to know about. To allow type uniquing, emit
737  // them without a name or a location.
738  EltTy =
739  DBuilder.createStructType(Unit, "", nullptr, LineNo,
740  FieldOffset, 0, Flags, nullptr, Elements);
741 
742  return DBuilder.createPointerType(EltTy, Size);
743 }
744 
745 llvm::DIType *CGDebugInfo::CreateType(const TemplateSpecializationType *Ty,
746  llvm::DIFile *Unit) {
747  assert(Ty->isTypeAlias());
748  llvm::DIType *Src = getOrCreateType(Ty->getAliasedType(), Unit);
749 
750  SmallString<128> NS;
751  llvm::raw_svector_ostream OS(NS);
753  /*qualified*/ false);
754 
756  OS, Ty->getArgs(), Ty->getNumArgs(),
757  CGM.getContext().getPrintingPolicy());
758 
759  TypeAliasDecl *AliasDecl = cast<TypeAliasTemplateDecl>(
760  Ty->getTemplateName().getAsTemplateDecl())->getTemplatedDecl();
761 
762  SourceLocation Loc = AliasDecl->getLocation();
763  return DBuilder.createTypedef(
764  Src, internString(OS.str()), getOrCreateFile(Loc), getLineNumber(Loc),
765  getContextDescriptor(cast<Decl>(AliasDecl->getDeclContext())));
766 }
767 
768 llvm::DIType *CGDebugInfo::CreateType(const TypedefType *Ty,
769  llvm::DIFile *Unit) {
770  // We don't set size information, but do specify where the typedef was
771  // declared.
772  SourceLocation Loc = Ty->getDecl()->getLocation();
773 
774  // Typedefs are derived from some other type.
775  return DBuilder.createTypedef(
776  getOrCreateType(Ty->getDecl()->getUnderlyingType(), Unit),
777  Ty->getDecl()->getName(), getOrCreateFile(Loc), getLineNumber(Loc),
778  getContextDescriptor(cast<Decl>(Ty->getDecl()->getDeclContext())));
779 }
780 
781 llvm::DIType *CGDebugInfo::CreateType(const FunctionType *Ty,
782  llvm::DIFile *Unit) {
784 
785  // Add the result type at least.
786  EltTys.push_back(getOrCreateType(Ty->getReturnType(), Unit));
787 
788  // Set up remainder of arguments if there is a prototype.
789  // otherwise emit it as a variadic function.
790  if (isa<FunctionNoProtoType>(Ty))
791  EltTys.push_back(DBuilder.createUnspecifiedParameter());
792  else if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(Ty)) {
793  for (unsigned i = 0, e = FPT->getNumParams(); i != e; ++i)
794  EltTys.push_back(getOrCreateType(FPT->getParamType(i), Unit));
795  if (FPT->isVariadic())
796  EltTys.push_back(DBuilder.createUnspecifiedParameter());
797  }
798 
799  llvm::DITypeRefArray EltTypeArray = DBuilder.getOrCreateTypeArray(EltTys);
800  return DBuilder.createSubroutineType(Unit, EltTypeArray);
801 }
802 
803 /// Convert an AccessSpecifier into the corresponding DINode flag.
804 /// As an optimization, return 0 if the access specifier equals the
805 /// default for the containing type.
806 static unsigned getAccessFlag(AccessSpecifier Access, const RecordDecl *RD) {
808  if (RD && RD->isClass())
809  Default = clang::AS_private;
810  else if (RD && (RD->isStruct() || RD->isUnion()))
811  Default = clang::AS_public;
812 
813  if (Access == Default)
814  return 0;
815 
816  switch (Access) {
817  case clang::AS_private:
818  return llvm::DINode::FlagPrivate;
819  case clang::AS_protected:
820  return llvm::DINode::FlagProtected;
821  case clang::AS_public:
822  return llvm::DINode::FlagPublic;
823  case clang::AS_none:
824  return 0;
825  }
826  llvm_unreachable("unexpected access enumerator");
827 }
828 
829 llvm::DIType *CGDebugInfo::createFieldType(
830  StringRef name, QualType type, uint64_t sizeInBitsOverride,
831  SourceLocation loc, AccessSpecifier AS, uint64_t offsetInBits,
832  llvm::DIFile *tunit, llvm::DIScope *scope, const RecordDecl *RD) {
833  llvm::DIType *debugType = getOrCreateType(type, tunit);
834 
835  // Get the location for the field.
836  llvm::DIFile *file = getOrCreateFile(loc);
837  unsigned line = getLineNumber(loc);
838 
839  uint64_t SizeInBits = 0;
840  unsigned AlignInBits = 0;
841  if (!type->isIncompleteArrayType()) {
842  TypeInfo TI = CGM.getContext().getTypeInfo(type);
843  SizeInBits = TI.Width;
844  AlignInBits = TI.Align;
845 
846  if (sizeInBitsOverride)
847  SizeInBits = sizeInBitsOverride;
848  }
849 
850  unsigned flags = getAccessFlag(AS, RD);
851  return DBuilder.createMemberType(scope, name, file, line, SizeInBits,
852  AlignInBits, offsetInBits, flags, debugType);
853 }
854 
855 void CGDebugInfo::CollectRecordLambdaFields(
856  const CXXRecordDecl *CXXDecl, SmallVectorImpl<llvm::Metadata *> &elements,
857  llvm::DIType *RecordTy) {
858  // For C++11 Lambdas a Field will be the same as a Capture, but the Capture
859  // has the name and the location of the variable so we should iterate over
860  // both concurrently.
861  const ASTRecordLayout &layout = CGM.getContext().getASTRecordLayout(CXXDecl);
862  RecordDecl::field_iterator Field = CXXDecl->field_begin();
863  unsigned fieldno = 0;
865  E = CXXDecl->captures_end();
866  I != E; ++I, ++Field, ++fieldno) {
867  const LambdaCapture &C = *I;
868  if (C.capturesVariable()) {
869  VarDecl *V = C.getCapturedVar();
870  llvm::DIFile *VUnit = getOrCreateFile(C.getLocation());
871  StringRef VName = V->getName();
872  uint64_t SizeInBitsOverride = 0;
873  if (Field->isBitField()) {
874  SizeInBitsOverride = Field->getBitWidthValue(CGM.getContext());
875  assert(SizeInBitsOverride && "found named 0-width bitfield");
876  }
877  llvm::DIType *fieldType = createFieldType(
878  VName, Field->getType(), SizeInBitsOverride, C.getLocation(),
879  Field->getAccess(), layout.getFieldOffset(fieldno), VUnit, RecordTy,
880  CXXDecl);
881  elements.push_back(fieldType);
882  } else if (C.capturesThis()) {
883  // TODO: Need to handle 'this' in some way by probably renaming the
884  // this of the lambda class and having a field member of 'this' or
885  // by using AT_object_pointer for the function and having that be
886  // used as 'this' for semantic references.
887  FieldDecl *f = *Field;
888  llvm::DIFile *VUnit = getOrCreateFile(f->getLocation());
889  QualType type = f->getType();
890  llvm::DIType *fieldType = createFieldType(
891  "this", type, 0, f->getLocation(), f->getAccess(),
892  layout.getFieldOffset(fieldno), VUnit, RecordTy, CXXDecl);
893 
894  elements.push_back(fieldType);
895  }
896  }
897 }
898 
899 llvm::DIDerivedType *
900 CGDebugInfo::CreateRecordStaticField(const VarDecl *Var, llvm::DIType *RecordTy,
901  const RecordDecl *RD) {
902  // Create the descriptor for the static variable, with or without
903  // constant initializers.
904  Var = Var->getCanonicalDecl();
905  llvm::DIFile *VUnit = getOrCreateFile(Var->getLocation());
906  llvm::DIType *VTy = getOrCreateType(Var->getType(), VUnit);
907 
908  unsigned LineNumber = getLineNumber(Var->getLocation());
909  StringRef VName = Var->getName();
910  llvm::Constant *C = nullptr;
911  if (Var->getInit()) {
912  const APValue *Value = Var->evaluateValue();
913  if (Value) {
914  if (Value->isInt())
915  C = llvm::ConstantInt::get(CGM.getLLVMContext(), Value->getInt());
916  if (Value->isFloat())
917  C = llvm::ConstantFP::get(CGM.getLLVMContext(), Value->getFloat());
918  }
919  }
920 
921  unsigned Flags = getAccessFlag(Var->getAccess(), RD);
922  llvm::DIDerivedType *GV = DBuilder.createStaticMemberType(
923  RecordTy, VName, VUnit, LineNumber, VTy, Flags, C);
924  StaticDataMemberCache[Var->getCanonicalDecl()].reset(GV);
925  return GV;
926 }
927 
928 void CGDebugInfo::CollectRecordNormalField(
929  const FieldDecl *field, uint64_t OffsetInBits, llvm::DIFile *tunit,
930  SmallVectorImpl<llvm::Metadata *> &elements, llvm::DIType *RecordTy,
931  const RecordDecl *RD) {
932  StringRef name = field->getName();
933  QualType type = field->getType();
934 
935  // Ignore unnamed fields unless they're anonymous structs/unions.
936  if (name.empty() && !type->isRecordType())
937  return;
938 
939  uint64_t SizeInBitsOverride = 0;
940  if (field->isBitField()) {
941  SizeInBitsOverride = field->getBitWidthValue(CGM.getContext());
942  assert(SizeInBitsOverride && "found named 0-width bitfield");
943  }
944 
945  llvm::DIType *fieldType =
946  createFieldType(name, type, SizeInBitsOverride, field->getLocation(),
947  field->getAccess(), OffsetInBits, tunit, RecordTy, RD);
948 
949  elements.push_back(fieldType);
950 }
951 
952 void CGDebugInfo::CollectRecordFields(
953  const RecordDecl *record, llvm::DIFile *tunit,
955  llvm::DICompositeType *RecordTy) {
956  const CXXRecordDecl *CXXDecl = dyn_cast<CXXRecordDecl>(record);
957 
958  if (CXXDecl && CXXDecl->isLambda())
959  CollectRecordLambdaFields(CXXDecl, elements, RecordTy);
960  else {
961  const ASTRecordLayout &layout = CGM.getContext().getASTRecordLayout(record);
962 
963  // Field number for non-static fields.
964  unsigned fieldNo = 0;
965 
966  // Static and non-static members should appear in the same order as
967  // the corresponding declarations in the source program.
968  for (const auto *I : record->decls())
969  if (const auto *V = dyn_cast<VarDecl>(I)) {
970  // Reuse the existing static member declaration if one exists
971  auto MI = StaticDataMemberCache.find(V->getCanonicalDecl());
972  if (MI != StaticDataMemberCache.end()) {
973  assert(MI->second &&
974  "Static data member declaration should still exist");
975  elements.push_back(cast<llvm::DIDerivedTypeBase>(MI->second));
976  } else {
977  auto Field = CreateRecordStaticField(V, RecordTy, record);
978  elements.push_back(Field);
979  }
980  } else if (const auto *field = dyn_cast<FieldDecl>(I)) {
981  CollectRecordNormalField(field, layout.getFieldOffset(fieldNo), tunit,
982  elements, RecordTy, record);
983 
984  // Bump field number for next field.
985  ++fieldNo;
986  }
987  }
988 }
989 
990 llvm::DISubroutineType *
991 CGDebugInfo::getOrCreateMethodType(const CXXMethodDecl *Method,
992  llvm::DIFile *Unit) {
993  const FunctionProtoType *Func = Method->getType()->getAs<FunctionProtoType>();
994  if (Method->isStatic())
995  return cast_or_null<llvm::DISubroutineType>(
996  getOrCreateType(QualType(Func, 0), Unit));
997  return getOrCreateInstanceMethodType(Method->getThisType(CGM.getContext()),
998  Func, Unit);
999 }
1000 
1001 llvm::DISubroutineType *CGDebugInfo::getOrCreateInstanceMethodType(
1002  QualType ThisPtr, const FunctionProtoType *Func, llvm::DIFile *Unit) {
1003  // Add "this" pointer.
1004  llvm::DITypeRefArray Args(
1005  cast<llvm::DISubroutineType>(getOrCreateType(QualType(Func, 0), Unit))
1006  ->getTypeArray());
1007  assert(Args.size() && "Invalid number of arguments!");
1008 
1010 
1011  // First element is always return type. For 'void' functions it is NULL.
1012  Elts.push_back(Args[0]);
1013 
1014  // "this" pointer is always first argument.
1015  const CXXRecordDecl *RD = ThisPtr->getPointeeCXXRecordDecl();
1016  if (isa<ClassTemplateSpecializationDecl>(RD)) {
1017  // Create pointer type directly in this case.
1018  const PointerType *ThisPtrTy = cast<PointerType>(ThisPtr);
1019  QualType PointeeTy = ThisPtrTy->getPointeeType();
1020  unsigned AS = CGM.getContext().getTargetAddressSpace(PointeeTy);
1021  uint64_t Size = CGM.getTarget().getPointerWidth(AS);
1022  uint64_t Align = CGM.getContext().getTypeAlign(ThisPtrTy);
1023  llvm::DIType *PointeeType = getOrCreateType(PointeeTy, Unit);
1024  llvm::DIType *ThisPtrType =
1025  DBuilder.createPointerType(PointeeType, Size, Align);
1026  TypeCache[ThisPtr.getAsOpaquePtr()].reset(ThisPtrType);
1027  // TODO: This and the artificial type below are misleading, the
1028  // types aren't artificial the argument is, but the current
1029  // metadata doesn't represent that.
1030  ThisPtrType = DBuilder.createObjectPointerType(ThisPtrType);
1031  Elts.push_back(ThisPtrType);
1032  } else {
1033  llvm::DIType *ThisPtrType = getOrCreateType(ThisPtr, Unit);
1034  TypeCache[ThisPtr.getAsOpaquePtr()].reset(ThisPtrType);
1035  ThisPtrType = DBuilder.createObjectPointerType(ThisPtrType);
1036  Elts.push_back(ThisPtrType);
1037  }
1038 
1039  // Copy rest of the arguments.
1040  for (unsigned i = 1, e = Args.size(); i != e; ++i)
1041  Elts.push_back(Args[i]);
1042 
1043  llvm::DITypeRefArray EltTypeArray = DBuilder.getOrCreateTypeArray(Elts);
1044 
1045  unsigned Flags = 0;
1046  if (Func->getExtProtoInfo().RefQualifier == RQ_LValue)
1047  Flags |= llvm::DINode::FlagLValueReference;
1048  if (Func->getExtProtoInfo().RefQualifier == RQ_RValue)
1049  Flags |= llvm::DINode::FlagRValueReference;
1050 
1051  return DBuilder.createSubroutineType(Unit, EltTypeArray, Flags);
1052 }
1053 
1054 /// isFunctionLocalClass - Return true if CXXRecordDecl is defined
1055 /// inside a function.
1056 static bool isFunctionLocalClass(const CXXRecordDecl *RD) {
1057  if (const CXXRecordDecl *NRD = dyn_cast<CXXRecordDecl>(RD->getDeclContext()))
1058  return isFunctionLocalClass(NRD);
1059  if (isa<FunctionDecl>(RD->getDeclContext()))
1060  return true;
1061  return false;
1062 }
1063 
1064 llvm::DISubprogram *CGDebugInfo::CreateCXXMemberFunction(
1065  const CXXMethodDecl *Method, llvm::DIFile *Unit, llvm::DIType *RecordTy) {
1066  bool IsCtorOrDtor =
1067  isa<CXXConstructorDecl>(Method) || isa<CXXDestructorDecl>(Method);
1068 
1069  StringRef MethodName = getFunctionName(Method);
1070  llvm::DISubroutineType *MethodTy = getOrCreateMethodType(Method, Unit);
1071 
1072  // Since a single ctor/dtor corresponds to multiple functions, it doesn't
1073  // make sense to give a single ctor/dtor a linkage name.
1074  StringRef MethodLinkageName;
1075  if (!IsCtorOrDtor && !isFunctionLocalClass(Method->getParent()))
1076  MethodLinkageName = CGM.getMangledName(Method);
1077 
1078  // Get the location for the method.
1079  llvm::DIFile *MethodDefUnit = nullptr;
1080  unsigned MethodLine = 0;
1081  if (!Method->isImplicit()) {
1082  MethodDefUnit = getOrCreateFile(Method->getLocation());
1083  MethodLine = getLineNumber(Method->getLocation());
1084  }
1085 
1086  // Collect virtual method info.
1087  llvm::DIType *ContainingType = nullptr;
1088  unsigned Virtuality = 0;
1089  unsigned VIndex = 0;
1090 
1091  if (Method->isVirtual()) {
1092  if (Method->isPure())
1093  Virtuality = llvm::dwarf::DW_VIRTUALITY_pure_virtual;
1094  else
1095  Virtuality = llvm::dwarf::DW_VIRTUALITY_virtual;
1096 
1097  // It doesn't make sense to give a virtual destructor a vtable index,
1098  // since a single destructor has two entries in the vtable.
1099  // FIXME: Add proper support for debug info for virtual calls in
1100  // the Microsoft ABI, where we may use multiple vptrs to make a vftable
1101  // lookup if we have multiple or virtual inheritance.
1102  if (!isa<CXXDestructorDecl>(Method) &&
1103  !CGM.getTarget().getCXXABI().isMicrosoft())
1104  VIndex = CGM.getItaniumVTableContext().getMethodVTableIndex(Method);
1105  ContainingType = RecordTy;
1106  }
1107 
1108  unsigned Flags = 0;
1109  if (Method->isImplicit())
1110  Flags |= llvm::DINode::FlagArtificial;
1111  Flags |= getAccessFlag(Method->getAccess(), Method->getParent());
1112  if (const CXXConstructorDecl *CXXC = dyn_cast<CXXConstructorDecl>(Method)) {
1113  if (CXXC->isExplicit())
1114  Flags |= llvm::DINode::FlagExplicit;
1115  } else if (const CXXConversionDecl *CXXC =
1116  dyn_cast<CXXConversionDecl>(Method)) {
1117  if (CXXC->isExplicit())
1118  Flags |= llvm::DINode::FlagExplicit;
1119  }
1120  if (Method->hasPrototype())
1121  Flags |= llvm::DINode::FlagPrototyped;
1122  if (Method->getRefQualifier() == RQ_LValue)
1123  Flags |= llvm::DINode::FlagLValueReference;
1124  if (Method->getRefQualifier() == RQ_RValue)
1125  Flags |= llvm::DINode::FlagRValueReference;
1126 
1127  llvm::DINodeArray TParamsArray = CollectFunctionTemplateParams(Method, Unit);
1128  llvm::DISubprogram *SP = DBuilder.createMethod(
1129  RecordTy, MethodName, MethodLinkageName, MethodDefUnit, MethodLine,
1130  MethodTy, /*isLocalToUnit=*/false,
1131  /* isDefinition=*/false, Virtuality, VIndex, ContainingType, Flags,
1132  CGM.getLangOpts().Optimize, nullptr, TParamsArray.get());
1133 
1134  SPCache[Method->getCanonicalDecl()].reset(SP);
1135 
1136  return SP;
1137 }
1138 
1139 void CGDebugInfo::CollectCXXMemberFunctions(
1140  const CXXRecordDecl *RD, llvm::DIFile *Unit,
1141  SmallVectorImpl<llvm::Metadata *> &EltTys, llvm::DIType *RecordTy) {
1142 
1143  // Since we want more than just the individual member decls if we
1144  // have templated functions iterate over every declaration to gather
1145  // the functions.
1146  for (const auto *I : RD->decls()) {
1147  const auto *Method = dyn_cast<CXXMethodDecl>(I);
1148  // If the member is implicit, don't add it to the member list. This avoids
1149  // the member being added to type units by LLVM, while still allowing it
1150  // to be emitted into the type declaration/reference inside the compile
1151  // unit.
1152  // Ditto 'nodebug' methods, for consistency with CodeGenFunction.cpp.
1153  // FIXME: Handle Using(Shadow?)Decls here to create
1154  // DW_TAG_imported_declarations inside the class for base decls brought into
1155  // derived classes. GDB doesn't seem to notice/leverage these when I tried
1156  // it, so I'm not rushing to fix this. (GCC seems to produce them, if
1157  // referenced)
1158  if (!Method || Method->isImplicit() || Method->hasAttr<NoDebugAttr>())
1159  continue;
1160 
1161  if (Method->getType()->getAs<FunctionProtoType>()->getContainedAutoType())
1162  continue;
1163 
1164  // Reuse the existing member function declaration if it exists.
1165  // It may be associated with the declaration of the type & should be
1166  // reused as we're building the definition.
1167  //
1168  // This situation can arise in the vtable-based debug info reduction where
1169  // implicit members are emitted in a non-vtable TU.
1170  auto MI = SPCache.find(Method->getCanonicalDecl());
1171  EltTys.push_back(MI == SPCache.end()
1172  ? CreateCXXMemberFunction(Method, Unit, RecordTy)
1173  : static_cast<llvm::Metadata *>(MI->second));
1174  }
1175 }
1176 
1177 void CGDebugInfo::CollectCXXBases(const CXXRecordDecl *RD, llvm::DIFile *Unit,
1179  llvm::DIType *RecordTy) {
1180  const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
1181  for (const auto &BI : RD->bases()) {
1182  unsigned BFlags = 0;
1183  uint64_t BaseOffset;
1184 
1185  const CXXRecordDecl *Base =
1186  cast<CXXRecordDecl>(BI.getType()->getAs<RecordType>()->getDecl());
1187 
1188  if (BI.isVirtual()) {
1189  if (CGM.getTarget().getCXXABI().isItaniumFamily()) {
1190  // virtual base offset offset is -ve. The code generator emits dwarf
1191  // expression where it expects +ve number.
1192  BaseOffset = 0 - CGM.getItaniumVTableContext()
1193  .getVirtualBaseOffsetOffset(RD, Base)
1194  .getQuantity();
1195  } else {
1196  // In the MS ABI, store the vbtable offset, which is analogous to the
1197  // vbase offset offset in Itanium.
1198  BaseOffset =
1199  4 * CGM.getMicrosoftVTableContext().getVBTableIndex(RD, Base);
1200  }
1201  BFlags = llvm::DINode::FlagVirtual;
1202  } else
1203  BaseOffset = CGM.getContext().toBits(RL.getBaseClassOffset(Base));
1204  // FIXME: Inconsistent units for BaseOffset. It is in bytes when
1205  // BI->isVirtual() and bits when not.
1206 
1207  BFlags |= getAccessFlag(BI.getAccessSpecifier(), RD);
1208  llvm::DIType *DTy = DBuilder.createInheritance(
1209  RecordTy, getOrCreateType(BI.getType(), Unit), BaseOffset, BFlags);
1210  EltTys.push_back(DTy);
1211  }
1212 }
1213 
1214 llvm::DINodeArray
1215 CGDebugInfo::CollectTemplateParams(const TemplateParameterList *TPList,
1217  llvm::DIFile *Unit) {
1218  SmallVector<llvm::Metadata *, 16> TemplateParams;
1219  for (unsigned i = 0, e = TAList.size(); i != e; ++i) {
1220  const TemplateArgument &TA = TAList[i];
1221  StringRef Name;
1222  if (TPList)
1223  Name = TPList->getParam(i)->getName();
1224  switch (TA.getKind()) {
1225  case TemplateArgument::Type: {
1226  llvm::DIType *TTy = getOrCreateType(TA.getAsType(), Unit);
1227  TemplateParams.push_back(
1228  DBuilder.createTemplateTypeParameter(TheCU, Name, TTy));
1229  } break;
1231  llvm::DIType *TTy = getOrCreateType(TA.getIntegralType(), Unit);
1232  TemplateParams.push_back(DBuilder.createTemplateValueParameter(
1233  TheCU, Name, TTy,
1234  llvm::ConstantInt::get(CGM.getLLVMContext(), TA.getAsIntegral())));
1235  } break;
1237  const ValueDecl *D = TA.getAsDecl();
1239  llvm::DIType *TTy = getOrCreateType(T, Unit);
1240  llvm::Constant *V = nullptr;
1241  const CXXMethodDecl *MD;
1242  // Variable pointer template parameters have a value that is the address
1243  // of the variable.
1244  if (const auto *VD = dyn_cast<VarDecl>(D))
1245  V = CGM.GetAddrOfGlobalVar(VD);
1246  // Member function pointers have special support for building them, though
1247  // this is currently unsupported in LLVM CodeGen.
1248  else if ((MD = dyn_cast<CXXMethodDecl>(D)) && MD->isInstance())
1249  V = CGM.getCXXABI().EmitMemberFunctionPointer(MD);
1250  else if (const auto *FD = dyn_cast<FunctionDecl>(D))
1251  V = CGM.GetAddrOfFunction(FD);
1252  // Member data pointers have special handling too to compute the fixed
1253  // offset within the object.
1254  else if (const auto *MPT = dyn_cast<MemberPointerType>(T.getTypePtr())) {
1255  // These five lines (& possibly the above member function pointer
1256  // handling) might be able to be refactored to use similar code in
1257  // CodeGenModule::getMemberPointerConstant
1258  uint64_t fieldOffset = CGM.getContext().getFieldOffset(D);
1259  CharUnits chars =
1260  CGM.getContext().toCharUnitsFromBits((int64_t)fieldOffset);
1261  V = CGM.getCXXABI().EmitMemberDataPointer(MPT, chars);
1262  }
1263  TemplateParams.push_back(DBuilder.createTemplateValueParameter(
1264  TheCU, Name, TTy,
1265  cast_or_null<llvm::Constant>(V->stripPointerCasts())));
1266  } break;
1268  QualType T = TA.getNullPtrType();
1269  llvm::DIType *TTy = getOrCreateType(T, Unit);
1270  llvm::Constant *V = nullptr;
1271  // Special case member data pointer null values since they're actually -1
1272  // instead of zero.
1273  if (const MemberPointerType *MPT =
1274  dyn_cast<MemberPointerType>(T.getTypePtr()))
1275  // But treat member function pointers as simple zero integers because
1276  // it's easier than having a special case in LLVM's CodeGen. If LLVM
1277  // CodeGen grows handling for values of non-null member function
1278  // pointers then perhaps we could remove this special case and rely on
1279  // EmitNullMemberPointer for member function pointers.
1280  if (MPT->isMemberDataPointer())
1281  V = CGM.getCXXABI().EmitNullMemberPointer(MPT);
1282  if (!V)
1283  V = llvm::ConstantInt::get(CGM.Int8Ty, 0);
1284  TemplateParams.push_back(DBuilder.createTemplateValueParameter(
1285  TheCU, Name, TTy, cast<llvm::Constant>(V)));
1286  } break;
1288  TemplateParams.push_back(DBuilder.createTemplateTemplateParameter(
1289  TheCU, Name, nullptr,
1291  break;
1293  TemplateParams.push_back(DBuilder.createTemplateParameterPack(
1294  TheCU, Name, nullptr,
1295  CollectTemplateParams(nullptr, TA.getPackAsArray(), Unit)));
1296  break;
1298  const Expr *E = TA.getAsExpr();
1299  QualType T = E->getType();
1300  if (E->isGLValue())
1301  T = CGM.getContext().getLValueReferenceType(T);
1302  llvm::Constant *V = CGM.EmitConstantExpr(E, T);
1303  assert(V && "Expression in template argument isn't constant");
1304  llvm::DIType *TTy = getOrCreateType(T, Unit);
1305  TemplateParams.push_back(DBuilder.createTemplateValueParameter(
1306  TheCU, Name, TTy, cast<llvm::Constant>(V->stripPointerCasts())));
1307  } break;
1308  // And the following should never occur:
1311  llvm_unreachable(
1312  "These argument types shouldn't exist in concrete types");
1313  }
1314  }
1315  return DBuilder.getOrCreateArray(TemplateParams);
1316 }
1317 
1318 llvm::DINodeArray
1319 CGDebugInfo::CollectFunctionTemplateParams(const FunctionDecl *FD,
1320  llvm::DIFile *Unit) {
1321  if (FD->getTemplatedKind() ==
1324  ->getTemplate()
1326  return CollectTemplateParams(
1327  TList, FD->getTemplateSpecializationArgs()->asArray(), Unit);
1328  }
1329  return llvm::DINodeArray();
1330 }
1331 
1332 llvm::DINodeArray CGDebugInfo::CollectCXXTemplateParams(
1333  const ClassTemplateSpecializationDecl *TSpecial, llvm::DIFile *Unit) {
1334  // Always get the full list of parameters, not just the ones from
1335  // the specialization.
1336  TemplateParameterList *TPList =
1338  const TemplateArgumentList &TAList = TSpecial->getTemplateArgs();
1339  return CollectTemplateParams(TPList, TAList.asArray(), Unit);
1340 }
1341 
1342 llvm::DIType *CGDebugInfo::getOrCreateVTablePtrType(llvm::DIFile *Unit) {
1343  if (VTablePtrType)
1344  return VTablePtrType;
1345 
1346  ASTContext &Context = CGM.getContext();
1347 
1348  /* Function type */
1349  llvm::Metadata *STy = getOrCreateType(Context.IntTy, Unit);
1350  llvm::DITypeRefArray SElements = DBuilder.getOrCreateTypeArray(STy);
1351  llvm::DIType *SubTy = DBuilder.createSubroutineType(Unit, SElements);
1352  unsigned Size = Context.getTypeSize(Context.VoidPtrTy);
1353  llvm::DIType *vtbl_ptr_type =
1354  DBuilder.createPointerType(SubTy, Size, 0, "__vtbl_ptr_type");
1355  VTablePtrType = DBuilder.createPointerType(vtbl_ptr_type, Size);
1356  return VTablePtrType;
1357 }
1358 
1359 StringRef CGDebugInfo::getVTableName(const CXXRecordDecl *RD) {
1360  // Copy the gdb compatible name on the side and use its reference.
1361  return internString("_vptr$", RD->getNameAsString());
1362 }
1363 
1364 void CGDebugInfo::CollectVTableInfo(const CXXRecordDecl *RD, llvm::DIFile *Unit,
1366  const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
1367 
1368  // If there is a primary base then it will hold vtable info.
1369  if (RL.getPrimaryBase())
1370  return;
1371 
1372  // If this class is not dynamic then there is not any vtable info to collect.
1373  if (!RD->isDynamicClass())
1374  return;
1375 
1376  unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
1377  llvm::DIType *VPTR = DBuilder.createMemberType(
1378  Unit, getVTableName(RD), Unit, 0, Size, 0, 0,
1379  llvm::DINode::FlagArtificial, getOrCreateVTablePtrType(Unit));
1380  EltTys.push_back(VPTR);
1381 }
1382 
1384  SourceLocation Loc) {
1385  assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
1386  llvm::DIType *T = getOrCreateType(RTy, getOrCreateFile(Loc));
1387  return T;
1388 }
1389 
1391  SourceLocation Loc) {
1392  assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
1393  llvm::DIType *T = getOrCreateType(D, getOrCreateFile(Loc));
1394  RetainedTypes.push_back(D.getAsOpaquePtr());
1395  return T;
1396 }
1397 
1399  if (DebugKind <= CodeGenOptions::DebugLineTablesOnly)
1400  return;
1401  QualType Ty = CGM.getContext().getEnumType(ED);
1402  void *TyPtr = Ty.getAsOpaquePtr();
1403  auto I = TypeCache.find(TyPtr);
1404  if (I == TypeCache.end() || !cast<llvm::DIType>(I->second)->isForwardDecl())
1405  return;
1406  llvm::DIType *Res = CreateTypeDefinition(Ty->castAs<EnumType>());
1407  assert(!Res->isForwardDecl());
1408  TypeCache[TyPtr].reset(Res);
1409 }
1410 
1412  if (DebugKind > CodeGenOptions::LimitedDebugInfo ||
1413  !CGM.getLangOpts().CPlusPlus)
1415 }
1416 
1418  if (DebugKind <= CodeGenOptions::DebugLineTablesOnly)
1419  return;
1420 
1421  if (const CXXRecordDecl *CXXDecl = dyn_cast<CXXRecordDecl>(RD))
1422  if (CXXDecl->isDynamicClass())
1423  return;
1424 
1425  QualType Ty = CGM.getContext().getRecordType(RD);
1426  llvm::DIType *T = getTypeOrNull(Ty);
1427  if (T && T->isForwardDecl())
1428  completeClassData(RD);
1429 }
1430 
1432  if (DebugKind <= CodeGenOptions::DebugLineTablesOnly)
1433  return;
1434  QualType Ty = CGM.getContext().getRecordType(RD);
1435  void *TyPtr = Ty.getAsOpaquePtr();
1436  auto I = TypeCache.find(TyPtr);
1437  if (I != TypeCache.end() && !cast<llvm::DIType>(I->second)->isForwardDecl())
1438  return;
1439  llvm::DIType *Res = CreateTypeDefinition(Ty->castAs<RecordType>());
1440  assert(!Res->isForwardDecl());
1441  TypeCache[TyPtr].reset(Res);
1442 }
1443 
1446  for (; I != End; ++I)
1447  if (FunctionDecl *Tmpl = I->getInstantiatedFromMemberFunction())
1448  if (!Tmpl->isImplicit() && Tmpl->isThisDeclarationADefinition() &&
1449  !I->getMemberSpecializationInfo()->isExplicitSpecialization())
1450  return true;
1451  return false;
1452 }
1453 
1455  const RecordDecl *RD,
1456  const LangOptions &LangOpts) {
1457  if (DebugKind > CodeGenOptions::LimitedDebugInfo)
1458  return false;
1459 
1460  if (!LangOpts.CPlusPlus)
1461  return false;
1462 
1463  if (!RD->isCompleteDefinitionRequired())
1464  return true;
1465 
1466  const CXXRecordDecl *CXXDecl = dyn_cast<CXXRecordDecl>(RD);
1467 
1468  if (!CXXDecl)
1469  return false;
1470 
1471  if (CXXDecl->hasDefinition() && CXXDecl->isDynamicClass())
1472  return true;
1473 
1475  if (const ClassTemplateSpecializationDecl *SD =
1476  dyn_cast<ClassTemplateSpecializationDecl>(RD))
1477  Spec = SD->getSpecializationKind();
1478 
1481  CXXDecl->method_end()))
1482  return true;
1483 
1484  return false;
1485 }
1486 
1487 llvm::DIType *CGDebugInfo::CreateType(const RecordType *Ty) {
1488  RecordDecl *RD = Ty->getDecl();
1489  llvm::DIType *T = cast_or_null<llvm::DIType>(getTypeOrNull(QualType(Ty, 0)));
1490  if (T || shouldOmitDefinition(DebugKind, RD, CGM.getLangOpts())) {
1491  if (!T)
1492  T = getOrCreateRecordFwdDecl(
1493  Ty, getContextDescriptor(cast<Decl>(RD->getDeclContext())));
1494  return T;
1495  }
1496 
1497  return CreateTypeDefinition(Ty);
1498 }
1499 
1500 llvm::DIType *CGDebugInfo::CreateTypeDefinition(const RecordType *Ty) {
1501  RecordDecl *RD = Ty->getDecl();
1502 
1503  // Get overall information about the record type for the debug info.
1504  llvm::DIFile *DefUnit = getOrCreateFile(RD->getLocation());
1505 
1506  // Records and classes and unions can all be recursive. To handle them, we
1507  // first generate a debug descriptor for the struct as a forward declaration.
1508  // Then (if it is a definition) we go through and get debug info for all of
1509  // its members. Finally, we create a descriptor for the complete type (which
1510  // may refer to the forward decl if the struct is recursive) and replace all
1511  // uses of the forward declaration with the final definition.
1512 
1513  auto *FwdDecl =
1514  cast<llvm::DICompositeType>(getOrCreateLimitedType(Ty, DefUnit));
1515 
1516  const RecordDecl *D = RD->getDefinition();
1517  if (!D || !D->isCompleteDefinition())
1518  return FwdDecl;
1519 
1520  if (const CXXRecordDecl *CXXDecl = dyn_cast<CXXRecordDecl>(RD))
1521  CollectContainingType(CXXDecl, FwdDecl);
1522 
1523  // Push the struct on region stack.
1524  LexicalBlockStack.emplace_back(&*FwdDecl);
1525  RegionMap[Ty->getDecl()].reset(FwdDecl);
1526 
1527  // Convert all the elements.
1529  // what about nested types?
1530 
1531  // Note: The split of CXXDecl information here is intentional, the
1532  // gdb tests will depend on a certain ordering at printout. The debug
1533  // information offsets are still correct if we merge them all together
1534  // though.
1535  const CXXRecordDecl *CXXDecl = dyn_cast<CXXRecordDecl>(RD);
1536  if (CXXDecl) {
1537  CollectCXXBases(CXXDecl, DefUnit, EltTys, FwdDecl);
1538  CollectVTableInfo(CXXDecl, DefUnit, EltTys);
1539  }
1540 
1541  // Collect data fields (including static variables and any initializers).
1542  CollectRecordFields(RD, DefUnit, EltTys, FwdDecl);
1543  if (CXXDecl)
1544  CollectCXXMemberFunctions(CXXDecl, DefUnit, EltTys, FwdDecl);
1545 
1546  LexicalBlockStack.pop_back();
1547  RegionMap.erase(Ty->getDecl());
1548 
1549  llvm::DINodeArray Elements = DBuilder.getOrCreateArray(EltTys);
1550  DBuilder.replaceArrays(FwdDecl, Elements);
1551 
1552  if (FwdDecl->isTemporary())
1553  FwdDecl =
1554  llvm::MDNode::replaceWithPermanent(llvm::TempDICompositeType(FwdDecl));
1555 
1556  RegionMap[Ty->getDecl()].reset(FwdDecl);
1557  return FwdDecl;
1558 }
1559 
1560 llvm::DIType *CGDebugInfo::CreateType(const ObjCObjectType *Ty,
1561  llvm::DIFile *Unit) {
1562  // Ignore protocols.
1563  return getOrCreateType(Ty->getBaseType(), Unit);
1564 }
1565 
1566 /// \return true if Getter has the default name for the property PD.
1568  const ObjCMethodDecl *Getter) {
1569  assert(PD);
1570  if (!Getter)
1571  return true;
1572 
1573  assert(Getter->getDeclName().isObjCZeroArgSelector());
1574  return PD->getName() ==
1576 }
1577 
1578 /// \return true if Setter has the default name for the property PD.
1580  const ObjCMethodDecl *Setter) {
1581  assert(PD);
1582  if (!Setter)
1583  return true;
1584 
1585  assert(Setter->getDeclName().isObjCOneArgSelector());
1588 }
1589 
1590 llvm::DIType *CGDebugInfo::CreateType(const ObjCInterfaceType *Ty,
1591  llvm::DIFile *Unit) {
1592  ObjCInterfaceDecl *ID = Ty->getDecl();
1593  if (!ID)
1594  return nullptr;
1595 
1596  // Get overall information about the record type for the debug info.
1597  llvm::DIFile *DefUnit = getOrCreateFile(ID->getLocation());
1598  unsigned Line = getLineNumber(ID->getLocation());
1599  auto RuntimeLang =
1600  static_cast<llvm::dwarf::SourceLanguage>(TheCU->getSourceLanguage());
1601 
1602  // If this is just a forward declaration return a special forward-declaration
1603  // debug type since we won't be able to lay out the entire type.
1604  ObjCInterfaceDecl *Def = ID->getDefinition();
1605  if (!Def || !Def->getImplementation()) {
1606  llvm::DIType *FwdDecl = DBuilder.createReplaceableCompositeType(
1607  llvm::dwarf::DW_TAG_structure_type, ID->getName(), TheCU, DefUnit, Line,
1608  RuntimeLang);
1609  ObjCInterfaceCache.push_back(ObjCInterfaceCacheEntry(Ty, FwdDecl, Unit));
1610  return FwdDecl;
1611  }
1612 
1613  return CreateTypeDefinition(Ty, Unit);
1614 }
1615 
1616 llvm::DIModule *
1617 CGDebugInfo::getOrCreateModuleRef(ExternalASTSource::ASTSourceDescriptor Mod) {
1618  auto it = ModuleRefCache.find(Mod.Signature);
1619  if (it != ModuleRefCache.end())
1620  return it->second;
1621 
1622  // Macro definitions that were defined with "-D" on the command line.
1623  SmallString<128> ConfigMacros;
1624  {
1625  llvm::raw_svector_ostream OS(ConfigMacros);
1626  const auto &PPOpts = CGM.getPreprocessorOpts();
1627  unsigned I = 0;
1628  // Translate the macro definitions back into a commmand line.
1629  for (auto &M : PPOpts.Macros) {
1630  if (++I > 1)
1631  OS << " ";
1632  const std::string &Macro = M.first;
1633  bool Undef = M.second;
1634  OS << "\"-" << (Undef ? 'U' : 'D');
1635  for (char c : Macro)
1636  switch (c) {
1637  case '\\' : OS << "\\\\"; break;
1638  case '"' : OS << "\\\""; break;
1639  default: OS << c;
1640  }
1641  OS << '\"';
1642  }
1643  }
1644  llvm::DIBuilder DIB(CGM.getModule());
1645  auto *CU = DIB.createCompileUnit(
1646  TheCU->getSourceLanguage(), internString(Mod.ModuleName),
1647  internString(Mod.Path), TheCU->getProducer(), true, StringRef(), 0,
1648  internString(Mod.ASTFile), llvm::DIBuilder::FullDebug, Mod.Signature);
1649  llvm::DIModule *ModuleRef =
1650  DIB.createModule(CU, Mod.ModuleName, ConfigMacros, internString(Mod.Path),
1651  internString(CGM.getHeaderSearchOpts().Sysroot));
1652  DIB.finalize();
1653  ModuleRefCache.insert(std::make_pair(Mod.Signature, ModuleRef));
1654  return ModuleRef;
1655 }
1656 
1657 llvm::DIType *CGDebugInfo::CreateTypeDefinition(const ObjCInterfaceType *Ty,
1658  llvm::DIFile *Unit) {
1659  ObjCInterfaceDecl *ID = Ty->getDecl();
1660  llvm::DIFile *DefUnit = getOrCreateFile(ID->getLocation());
1661  unsigned Line = getLineNumber(ID->getLocation());
1662  unsigned RuntimeLang = TheCU->getSourceLanguage();
1663 
1664  // Bit size, align and offset of the type.
1665  uint64_t Size = CGM.getContext().getTypeSize(Ty);
1666  uint64_t Align = CGM.getContext().getTypeAlign(Ty);
1667 
1668  unsigned Flags = 0;
1669  if (ID->getImplementation())
1670  Flags |= llvm::DINode::FlagObjcClassComplete;
1671 
1672  llvm::DICompositeType *RealDecl = DBuilder.createStructType(
1673  Unit, ID->getName(), DefUnit, Line, Size, Align, Flags, nullptr,
1674  llvm::DINodeArray(), RuntimeLang);
1675 
1676  QualType QTy(Ty, 0);
1677  TypeCache[QTy.getAsOpaquePtr()].reset(RealDecl);
1678 
1679  // Push the struct on region stack.
1680  LexicalBlockStack.emplace_back(RealDecl);
1681  RegionMap[Ty->getDecl()].reset(RealDecl);
1682 
1683  // Convert all the elements.
1685 
1686  ObjCInterfaceDecl *SClass = ID->getSuperClass();
1687  if (SClass) {
1688  llvm::DIType *SClassTy =
1689  getOrCreateType(CGM.getContext().getObjCInterfaceType(SClass), Unit);
1690  if (!SClassTy)
1691  return nullptr;
1692 
1693  llvm::DIType *InhTag = DBuilder.createInheritance(RealDecl, SClassTy, 0, 0);
1694  EltTys.push_back(InhTag);
1695  }
1696 
1697  // Create entries for all of the properties.
1698  for (const auto *PD : ID->properties()) {
1699  SourceLocation Loc = PD->getLocation();
1700  llvm::DIFile *PUnit = getOrCreateFile(Loc);
1701  unsigned PLine = getLineNumber(Loc);
1702  ObjCMethodDecl *Getter = PD->getGetterMethodDecl();
1703  ObjCMethodDecl *Setter = PD->getSetterMethodDecl();
1704  llvm::MDNode *PropertyNode = DBuilder.createObjCProperty(
1705  PD->getName(), PUnit, PLine,
1706  hasDefaultGetterName(PD, Getter) ? ""
1707  : getSelectorName(PD->getGetterName()),
1708  hasDefaultSetterName(PD, Setter) ? ""
1709  : getSelectorName(PD->getSetterName()),
1710  PD->getPropertyAttributes(), getOrCreateType(PD->getType(), PUnit));
1711  EltTys.push_back(PropertyNode);
1712  }
1713 
1714  const ASTRecordLayout &RL = CGM.getContext().getASTObjCInterfaceLayout(ID);
1715  unsigned FieldNo = 0;
1716  for (ObjCIvarDecl *Field = ID->all_declared_ivar_begin(); Field;
1717  Field = Field->getNextIvar(), ++FieldNo) {
1718  llvm::DIType *FieldTy = getOrCreateType(Field->getType(), Unit);
1719  if (!FieldTy)
1720  return nullptr;
1721 
1722  StringRef FieldName = Field->getName();
1723 
1724  // Ignore unnamed fields.
1725  if (FieldName.empty())
1726  continue;
1727 
1728  // Get the location for the field.
1729  llvm::DIFile *FieldDefUnit = getOrCreateFile(Field->getLocation());
1730  unsigned FieldLine = getLineNumber(Field->getLocation());
1731  QualType FType = Field->getType();
1732  uint64_t FieldSize = 0;
1733  unsigned FieldAlign = 0;
1734 
1735  if (!FType->isIncompleteArrayType()) {
1736 
1737  // Bit size, align and offset of the type.
1738  FieldSize = Field->isBitField()
1739  ? Field->getBitWidthValue(CGM.getContext())
1740  : CGM.getContext().getTypeSize(FType);
1741  FieldAlign = CGM.getContext().getTypeAlign(FType);
1742  }
1743 
1744  uint64_t FieldOffset;
1745  if (CGM.getLangOpts().ObjCRuntime.isNonFragile()) {
1746  // We don't know the runtime offset of an ivar if we're using the
1747  // non-fragile ABI. For bitfields, use the bit offset into the first
1748  // byte of storage of the bitfield. For other fields, use zero.
1749  if (Field->isBitField()) {
1750  FieldOffset =
1751  CGM.getObjCRuntime().ComputeBitfieldBitOffset(CGM, ID, Field);
1752  FieldOffset %= CGM.getContext().getCharWidth();
1753  } else {
1754  FieldOffset = 0;
1755  }
1756  } else {
1757  FieldOffset = RL.getFieldOffset(FieldNo);
1758  }
1759 
1760  unsigned Flags = 0;
1761  if (Field->getAccessControl() == ObjCIvarDecl::Protected)
1762  Flags = llvm::DINode::FlagProtected;
1763  else if (Field->getAccessControl() == ObjCIvarDecl::Private)
1764  Flags = llvm::DINode::FlagPrivate;
1765  else if (Field->getAccessControl() == ObjCIvarDecl::Public)
1766  Flags = llvm::DINode::FlagPublic;
1767 
1768  llvm::MDNode *PropertyNode = nullptr;
1769  if (ObjCImplementationDecl *ImpD = ID->getImplementation()) {
1770  if (ObjCPropertyImplDecl *PImpD =
1771  ImpD->FindPropertyImplIvarDecl(Field->getIdentifier())) {
1772  if (ObjCPropertyDecl *PD = PImpD->getPropertyDecl()) {
1773  SourceLocation Loc = PD->getLocation();
1774  llvm::DIFile *PUnit = getOrCreateFile(Loc);
1775  unsigned PLine = getLineNumber(Loc);
1776  ObjCMethodDecl *Getter = PD->getGetterMethodDecl();
1777  ObjCMethodDecl *Setter = PD->getSetterMethodDecl();
1778  PropertyNode = DBuilder.createObjCProperty(
1779  PD->getName(), PUnit, PLine,
1780  hasDefaultGetterName(PD, Getter) ? "" : getSelectorName(
1781  PD->getGetterName()),
1782  hasDefaultSetterName(PD, Setter) ? "" : getSelectorName(
1783  PD->getSetterName()),
1784  PD->getPropertyAttributes(),
1785  getOrCreateType(PD->getType(), PUnit));
1786  }
1787  }
1788  }
1789  FieldTy = DBuilder.createObjCIVar(FieldName, FieldDefUnit, FieldLine,
1790  FieldSize, FieldAlign, FieldOffset, Flags,
1791  FieldTy, PropertyNode);
1792  EltTys.push_back(FieldTy);
1793  }
1794 
1795  llvm::DINodeArray Elements = DBuilder.getOrCreateArray(EltTys);
1796  DBuilder.replaceArrays(RealDecl, Elements);
1797 
1798  LexicalBlockStack.pop_back();
1799  return RealDecl;
1800 }
1801 
1802 llvm::DIType *CGDebugInfo::CreateType(const VectorType *Ty,
1803  llvm::DIFile *Unit) {
1804  llvm::DIType *ElementTy = getOrCreateType(Ty->getElementType(), Unit);
1805  int64_t Count = Ty->getNumElements();
1806  if (Count == 0)
1807  // If number of elements are not known then this is an unbounded array.
1808  // Use Count == -1 to express such arrays.
1809  Count = -1;
1810 
1811  llvm::Metadata *Subscript = DBuilder.getOrCreateSubrange(0, Count);
1812  llvm::DINodeArray SubscriptArray = DBuilder.getOrCreateArray(Subscript);
1813 
1814  uint64_t Size = CGM.getContext().getTypeSize(Ty);
1815  uint64_t Align = CGM.getContext().getTypeAlign(Ty);
1816 
1817  return DBuilder.createVectorType(Size, Align, ElementTy, SubscriptArray);
1818 }
1819 
1820 llvm::DIType *CGDebugInfo::CreateType(const ArrayType *Ty, llvm::DIFile *Unit) {
1821  uint64_t Size;
1822  uint64_t Align;
1823 
1824  // FIXME: make getTypeAlign() aware of VLAs and incomplete array types
1825  if (const VariableArrayType *VAT = dyn_cast<VariableArrayType>(Ty)) {
1826  Size = 0;
1827  Align =
1828  CGM.getContext().getTypeAlign(CGM.getContext().getBaseElementType(VAT));
1829  } else if (Ty->isIncompleteArrayType()) {
1830  Size = 0;
1831  if (Ty->getElementType()->isIncompleteType())
1832  Align = 0;
1833  else
1834  Align = CGM.getContext().getTypeAlign(Ty->getElementType());
1835  } else if (Ty->isIncompleteType()) {
1836  Size = 0;
1837  Align = 0;
1838  } else {
1839  // Size and align of the whole array, not the element type.
1840  Size = CGM.getContext().getTypeSize(Ty);
1841  Align = CGM.getContext().getTypeAlign(Ty);
1842  }
1843 
1844  // Add the dimensions of the array. FIXME: This loses CV qualifiers from
1845  // interior arrays, do we care? Why aren't nested arrays represented the
1846  // obvious/recursive way?
1848  QualType EltTy(Ty, 0);
1849  while ((Ty = dyn_cast<ArrayType>(EltTy))) {
1850  // If the number of elements is known, then count is that number. Otherwise,
1851  // it's -1. This allows us to represent a subrange with an array of 0
1852  // elements, like this:
1853  //
1854  // struct foo {
1855  // int x[0];
1856  // };
1857  int64_t Count = -1; // Count == -1 is an unbounded array.
1858  if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(Ty))
1859  Count = CAT->getSize().getZExtValue();
1860 
1861  // FIXME: Verify this is right for VLAs.
1862  Subscripts.push_back(DBuilder.getOrCreateSubrange(0, Count));
1863  EltTy = Ty->getElementType();
1864  }
1865 
1866  llvm::DINodeArray SubscriptArray = DBuilder.getOrCreateArray(Subscripts);
1867 
1868  return DBuilder.createArrayType(Size, Align, getOrCreateType(EltTy, Unit),
1869  SubscriptArray);
1870 }
1871 
1872 llvm::DIType *CGDebugInfo::CreateType(const LValueReferenceType *Ty,
1873  llvm::DIFile *Unit) {
1874  return CreatePointerLikeType(llvm::dwarf::DW_TAG_reference_type, Ty,
1875  Ty->getPointeeType(), Unit);
1876 }
1877 
1878 llvm::DIType *CGDebugInfo::CreateType(const RValueReferenceType *Ty,
1879  llvm::DIFile *Unit) {
1880  return CreatePointerLikeType(llvm::dwarf::DW_TAG_rvalue_reference_type, Ty,
1881  Ty->getPointeeType(), Unit);
1882 }
1883 
1884 llvm::DIType *CGDebugInfo::CreateType(const MemberPointerType *Ty,
1885  llvm::DIFile *U) {
1886  uint64_t Size = CGM.getCXXABI().isTypeInfoCalculable(QualType(Ty, 0))
1887  ? CGM.getContext().getTypeSize(Ty)
1888  : 0;
1889  llvm::DIType *ClassType = getOrCreateType(QualType(Ty->getClass(), 0), U);
1890  if (Ty->isMemberDataPointerType())
1891  return DBuilder.createMemberPointerType(
1892  getOrCreateType(Ty->getPointeeType(), U), ClassType, Size);
1893 
1894  const FunctionProtoType *FPT =
1896  return DBuilder.createMemberPointerType(
1897  getOrCreateInstanceMethodType(CGM.getContext().getPointerType(QualType(
1898  Ty->getClass(), FPT->getTypeQuals())),
1899  FPT, U),
1900  ClassType, Size);
1901 }
1902 
1903 llvm::DIType *CGDebugInfo::CreateType(const AtomicType *Ty, llvm::DIFile *U) {
1904  // Ignore the atomic wrapping
1905  // FIXME: What is the correct representation?
1906  return getOrCreateType(Ty->getValueType(), U);
1907 }
1908 
1909 llvm::DIType *CGDebugInfo::CreateEnumType(const EnumType *Ty) {
1910  const EnumDecl *ED = Ty->getDecl();
1911  uint64_t Size = 0;
1912  uint64_t Align = 0;
1913  if (!ED->getTypeForDecl()->isIncompleteType()) {
1914  Size = CGM.getContext().getTypeSize(ED->getTypeForDecl());
1915  Align = CGM.getContext().getTypeAlign(ED->getTypeForDecl());
1916  }
1917 
1918  SmallString<256> FullName = getUniqueTagTypeName(Ty, CGM, TheCU);
1919 
1920  // If this is just a forward declaration, construct an appropriately
1921  // marked node and just return it.
1922  if (!ED->getDefinition()) {
1923  llvm::DIScope *EDContext =
1924  getContextDescriptor(cast<Decl>(ED->getDeclContext()));
1925  llvm::DIFile *DefUnit = getOrCreateFile(ED->getLocation());
1926  unsigned Line = getLineNumber(ED->getLocation());
1927  StringRef EDName = ED->getName();
1928  llvm::DIType *RetTy = DBuilder.createReplaceableCompositeType(
1929  llvm::dwarf::DW_TAG_enumeration_type, EDName, EDContext, DefUnit, Line,
1930  0, Size, Align, llvm::DINode::FlagFwdDecl, FullName);
1931  ReplaceMap.emplace_back(
1932  std::piecewise_construct, std::make_tuple(Ty),
1933  std::make_tuple(static_cast<llvm::Metadata *>(RetTy)));
1934  return RetTy;
1935  }
1936 
1937  return CreateTypeDefinition(Ty);
1938 }
1939 
1940 llvm::DIType *CGDebugInfo::CreateTypeDefinition(const EnumType *Ty) {
1941  const EnumDecl *ED = Ty->getDecl();
1942  uint64_t Size = 0;
1943  uint64_t Align = 0;
1944  if (!ED->getTypeForDecl()->isIncompleteType()) {
1945  Size = CGM.getContext().getTypeSize(ED->getTypeForDecl());
1946  Align = CGM.getContext().getTypeAlign(ED->getTypeForDecl());
1947  }
1948 
1949  SmallString<256> FullName = getUniqueTagTypeName(Ty, CGM, TheCU);
1950 
1951  // Create elements for each enumerator.
1953  ED = ED->getDefinition();
1954  for (const auto *Enum : ED->enumerators()) {
1955  Enumerators.push_back(DBuilder.createEnumerator(
1956  Enum->getName(), Enum->getInitVal().getSExtValue()));
1957  }
1958 
1959  // Return a CompositeType for the enum itself.
1960  llvm::DINodeArray EltArray = DBuilder.getOrCreateArray(Enumerators);
1961 
1962  llvm::DIFile *DefUnit = getOrCreateFile(ED->getLocation());
1963  unsigned Line = getLineNumber(ED->getLocation());
1964  llvm::DIScope *EnumContext =
1965  getContextDescriptor(cast<Decl>(ED->getDeclContext()));
1966  llvm::DIType *ClassTy =
1967  ED->isFixed() ? getOrCreateType(ED->getIntegerType(), DefUnit) : nullptr;
1968  return DBuilder.createEnumerationType(EnumContext, ED->getName(), DefUnit,
1969  Line, Size, Align, EltArray, ClassTy,
1970  FullName);
1971 }
1972 
1974  Qualifiers Quals;
1975  do {
1976  Qualifiers InnerQuals = T.getLocalQualifiers();
1977  // Qualifiers::operator+() doesn't like it if you add a Qualifier
1978  // that is already there.
1979  Quals += Qualifiers::removeCommonQualifiers(Quals, InnerQuals);
1980  Quals += InnerQuals;
1981  QualType LastT = T;
1982  switch (T->getTypeClass()) {
1983  default:
1984  return C.getQualifiedType(T.getTypePtr(), Quals);
1985  case Type::TemplateSpecialization: {
1986  const auto *Spec = cast<TemplateSpecializationType>(T);
1987  if (Spec->isTypeAlias())
1988  return C.getQualifiedType(T.getTypePtr(), Quals);
1989  T = Spec->desugar();
1990  break;
1991  }
1992  case Type::TypeOfExpr:
1993  T = cast<TypeOfExprType>(T)->getUnderlyingExpr()->getType();
1994  break;
1995  case Type::TypeOf:
1996  T = cast<TypeOfType>(T)->getUnderlyingType();
1997  break;
1998  case Type::Decltype:
1999  T = cast<DecltypeType>(T)->getUnderlyingType();
2000  break;
2001  case Type::UnaryTransform:
2002  T = cast<UnaryTransformType>(T)->getUnderlyingType();
2003  break;
2004  case Type::Attributed:
2005  T = cast<AttributedType>(T)->getEquivalentType();
2006  break;
2007  case Type::Elaborated:
2008  T = cast<ElaboratedType>(T)->getNamedType();
2009  break;
2010  case Type::Paren:
2011  T = cast<ParenType>(T)->getInnerType();
2012  break;
2013  case Type::SubstTemplateTypeParm:
2014  T = cast<SubstTemplateTypeParmType>(T)->getReplacementType();
2015  break;
2016  case Type::Auto:
2017  QualType DT = cast<AutoType>(T)->getDeducedType();
2018  assert(!DT.isNull() && "Undeduced types shouldn't reach here.");
2019  T = DT;
2020  break;
2021  }
2022 
2023  assert(T != LastT && "Type unwrapping failed to unwrap!");
2024  (void)LastT;
2025  } while (true);
2026 }
2027 
2028 llvm::DIType *CGDebugInfo::getTypeOrNull(QualType Ty) {
2029 
2030  // Unwrap the type as needed for debug information.
2031  Ty = UnwrapTypeForDebugInfo(Ty, CGM.getContext());
2032 
2033  auto it = TypeCache.find(Ty.getAsOpaquePtr());
2034  if (it != TypeCache.end()) {
2035  // Verify that the debug info still exists.
2036  if (llvm::Metadata *V = it->second)
2037  return cast<llvm::DIType>(V);
2038  }
2039 
2040  return nullptr;
2041 }
2042 
2043 void CGDebugInfo::completeTemplateDefinition(
2044  const ClassTemplateSpecializationDecl &SD) {
2045  if (DebugKind <= CodeGenOptions::DebugLineTablesOnly)
2046  return;
2047 
2048  completeClassData(&SD);
2049  // In case this type has no member function definitions being emitted, ensure
2050  // it is retained
2051  RetainedTypes.push_back(CGM.getContext().getRecordType(&SD).getAsOpaquePtr());
2052 }
2053 
2054 llvm::DIType *CGDebugInfo::getOrCreateType(QualType Ty, llvm::DIFile *Unit) {
2055  if (Ty.isNull())
2056  return nullptr;
2057 
2058  // Unwrap the type as needed for debug information.
2059  Ty = UnwrapTypeForDebugInfo(Ty, CGM.getContext());
2060 
2061  if (auto *T = getTypeOrNull(Ty))
2062  return T;
2063 
2064  // Otherwise create the type.
2065  llvm::DIType *Res = CreateTypeNode(Ty, Unit);
2066  void *TyPtr = Ty.getAsOpaquePtr();
2067 
2068  // And update the type cache.
2069  TypeCache[TyPtr].reset(Res);
2070 
2071  return Res;
2072 }
2073 
2074 unsigned CGDebugInfo::Checksum(const ObjCInterfaceDecl *ID) {
2075  // The assumption is that the number of ivars can only increase
2076  // monotonically, so it is safe to just use their current number as
2077  // a checksum.
2078  unsigned Sum = 0;
2079  for (const ObjCIvarDecl *Ivar = ID->all_declared_ivar_begin();
2080  Ivar != nullptr; Ivar = Ivar->getNextIvar())
2081  ++Sum;
2082 
2083  return Sum;
2084 }
2085 
2086 ObjCInterfaceDecl *CGDebugInfo::getObjCInterfaceDecl(QualType Ty) {
2087  switch (Ty->getTypeClass()) {
2088  case Type::ObjCObjectPointer:
2089  return getObjCInterfaceDecl(
2090  cast<ObjCObjectPointerType>(Ty)->getPointeeType());
2091  case Type::ObjCInterface:
2092  return cast<ObjCInterfaceType>(Ty)->getDecl();
2093  default:
2094  return nullptr;
2095  }
2096 }
2097 
2098 llvm::DIType *CGDebugInfo::CreateTypeNode(QualType Ty, llvm::DIFile *Unit) {
2099  // Handle qualifiers, which recursively handles what they refer to.
2100  if (Ty.hasLocalQualifiers())
2101  return CreateQualifiedType(Ty, Unit);
2102 
2103  // Work out details of type.
2104  switch (Ty->getTypeClass()) {
2105 #define TYPE(Class, Base)
2106 #define ABSTRACT_TYPE(Class, Base)
2107 #define NON_CANONICAL_TYPE(Class, Base)
2108 #define DEPENDENT_TYPE(Class, Base) case Type::Class:
2109 #include "clang/AST/TypeNodes.def"
2110  llvm_unreachable("Dependent types cannot show up in debug information");
2111 
2112  case Type::ExtVector:
2113  case Type::Vector:
2114  return CreateType(cast<VectorType>(Ty), Unit);
2115  case Type::ObjCObjectPointer:
2116  return CreateType(cast<ObjCObjectPointerType>(Ty), Unit);
2117  case Type::ObjCObject:
2118  return CreateType(cast<ObjCObjectType>(Ty), Unit);
2119  case Type::ObjCInterface:
2120  return CreateType(cast<ObjCInterfaceType>(Ty), Unit);
2121  case Type::Builtin:
2122  return CreateType(cast<BuiltinType>(Ty));
2123  case Type::Complex:
2124  return CreateType(cast<ComplexType>(Ty));
2125  case Type::Pointer:
2126  return CreateType(cast<PointerType>(Ty), Unit);
2127  case Type::Adjusted:
2128  case Type::Decayed:
2129  // Decayed and adjusted types use the adjusted type in LLVM and DWARF.
2130  return CreateType(
2131  cast<PointerType>(cast<AdjustedType>(Ty)->getAdjustedType()), Unit);
2132  case Type::BlockPointer:
2133  return CreateType(cast<BlockPointerType>(Ty), Unit);
2134  case Type::Typedef:
2135  return CreateType(cast<TypedefType>(Ty), Unit);
2136  case Type::Record:
2137  return CreateType(cast<RecordType>(Ty));
2138  case Type::Enum:
2139  return CreateEnumType(cast<EnumType>(Ty));
2140  case Type::FunctionProto:
2141  case Type::FunctionNoProto:
2142  return CreateType(cast<FunctionType>(Ty), Unit);
2143  case Type::ConstantArray:
2144  case Type::VariableArray:
2145  case Type::IncompleteArray:
2146  return CreateType(cast<ArrayType>(Ty), Unit);
2147 
2148  case Type::LValueReference:
2149  return CreateType(cast<LValueReferenceType>(Ty), Unit);
2150  case Type::RValueReference:
2151  return CreateType(cast<RValueReferenceType>(Ty), Unit);
2152 
2153  case Type::MemberPointer:
2154  return CreateType(cast<MemberPointerType>(Ty), Unit);
2155 
2156  case Type::Atomic:
2157  return CreateType(cast<AtomicType>(Ty), Unit);
2158 
2159  case Type::TemplateSpecialization:
2160  return CreateType(cast<TemplateSpecializationType>(Ty), Unit);
2161 
2162  case Type::Auto:
2163  case Type::Attributed:
2164  case Type::Elaborated:
2165  case Type::Paren:
2166  case Type::SubstTemplateTypeParm:
2167  case Type::TypeOfExpr:
2168  case Type::TypeOf:
2169  case Type::Decltype:
2170  case Type::UnaryTransform:
2171  case Type::PackExpansion:
2172  break;
2173  }
2174 
2175  llvm_unreachable("type should have been unwrapped!");
2176 }
2177 
2178 llvm::DIType *CGDebugInfo::getOrCreateLimitedType(const RecordType *Ty,
2179  llvm::DIFile *Unit) {
2180  QualType QTy(Ty, 0);
2181 
2182  auto *T = cast_or_null<llvm::DICompositeTypeBase>(getTypeOrNull(QTy));
2183 
2184  // We may have cached a forward decl when we could have created
2185  // a non-forward decl. Go ahead and create a non-forward decl
2186  // now.
2187  if (T && !T->isForwardDecl())
2188  return T;
2189 
2190  // Otherwise create the type.
2191  llvm::DICompositeType *Res = CreateLimitedType(Ty);
2192 
2193  // Propagate members from the declaration to the definition
2194  // CreateType(const RecordType*) will overwrite this with the members in the
2195  // correct order if the full type is needed.
2196  DBuilder.replaceArrays(Res, T ? T->getElements() : llvm::DINodeArray());
2197 
2198  // And update the type cache.
2199  TypeCache[QTy.getAsOpaquePtr()].reset(Res);
2200  return Res;
2201 }
2202 
2203 // TODO: Currently used for context chains when limiting debug info.
2204 llvm::DICompositeType *CGDebugInfo::CreateLimitedType(const RecordType *Ty) {
2205  RecordDecl *RD = Ty->getDecl();
2206 
2207  // Get overall information about the record type for the debug info.
2208  llvm::DIFile *DefUnit = getOrCreateFile(RD->getLocation());
2209  unsigned Line = getLineNumber(RD->getLocation());
2210  StringRef RDName = getClassName(RD);
2211 
2212  llvm::DIScope *RDContext =
2213  getContextDescriptor(cast<Decl>(RD->getDeclContext()));
2214 
2215  // If we ended up creating the type during the context chain construction,
2216  // just return that.
2217  auto *T = cast_or_null<llvm::DICompositeType>(
2218  getTypeOrNull(CGM.getContext().getRecordType(RD)));
2219  if (T && (!T->isForwardDecl() || !RD->getDefinition()))
2220  return T;
2221 
2222  // If this is just a forward or incomplete declaration, construct an
2223  // appropriately marked node and just return it.
2224  const RecordDecl *D = RD->getDefinition();
2225  if (!D || !D->isCompleteDefinition())
2226  return getOrCreateRecordFwdDecl(Ty, RDContext);
2227 
2228  uint64_t Size = CGM.getContext().getTypeSize(Ty);
2229  uint64_t Align = CGM.getContext().getTypeAlign(Ty);
2230 
2231  SmallString<256> FullName = getUniqueTagTypeName(Ty, CGM, TheCU);
2232 
2233  llvm::DICompositeType *RealDecl = DBuilder.createReplaceableCompositeType(
2234  getTagForRecord(RD), RDName, RDContext, DefUnit, Line, 0, Size, Align, 0,
2235  FullName);
2236 
2237  RegionMap[Ty->getDecl()].reset(RealDecl);
2238  TypeCache[QualType(Ty, 0).getAsOpaquePtr()].reset(RealDecl);
2239 
2240  if (const ClassTemplateSpecializationDecl *TSpecial =
2241  dyn_cast<ClassTemplateSpecializationDecl>(RD))
2242  DBuilder.replaceArrays(RealDecl, llvm::DINodeArray(),
2243  CollectCXXTemplateParams(TSpecial, DefUnit));
2244  return RealDecl;
2245 }
2246 
2247 void CGDebugInfo::CollectContainingType(const CXXRecordDecl *RD,
2248  llvm::DICompositeType *RealDecl) {
2249  // A class's primary base or the class itself contains the vtable.
2250  llvm::DICompositeType *ContainingType = nullptr;
2251  const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
2252  if (const CXXRecordDecl *PBase = RL.getPrimaryBase()) {
2253  // Seek non-virtual primary base root.
2254  while (1) {
2255  const ASTRecordLayout &BRL = CGM.getContext().getASTRecordLayout(PBase);
2256  const CXXRecordDecl *PBT = BRL.getPrimaryBase();
2257  if (PBT && !BRL.isPrimaryBaseVirtual())
2258  PBase = PBT;
2259  else
2260  break;
2261  }
2262  ContainingType = cast<llvm::DICompositeType>(
2263  getOrCreateType(QualType(PBase->getTypeForDecl(), 0),
2264  getOrCreateFile(RD->getLocation())));
2265  } else if (RD->isDynamicClass())
2266  ContainingType = RealDecl;
2267 
2268  DBuilder.replaceVTableHolder(RealDecl, ContainingType);
2269 }
2270 
2271 llvm::DIType *CGDebugInfo::CreateMemberType(llvm::DIFile *Unit, QualType FType,
2272  StringRef Name, uint64_t *Offset) {
2273  llvm::DIType *FieldTy = CGDebugInfo::getOrCreateType(FType, Unit);
2274  uint64_t FieldSize = CGM.getContext().getTypeSize(FType);
2275  unsigned FieldAlign = CGM.getContext().getTypeAlign(FType);
2276  llvm::DIType *Ty = DBuilder.createMemberType(Unit, Name, Unit, 0, FieldSize,
2277  FieldAlign, *Offset, 0, FieldTy);
2278  *Offset += FieldSize;
2279  return Ty;
2280 }
2281 
2282 void CGDebugInfo::collectFunctionDeclProps(GlobalDecl GD, llvm::DIFile *Unit,
2283  StringRef &Name,
2284  StringRef &LinkageName,
2285  llvm::DIScope *&FDContext,
2286  llvm::DINodeArray &TParamsArray,
2287  unsigned &Flags) {
2288  const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl());
2289  Name = getFunctionName(FD);
2290  // Use mangled name as linkage name for C/C++ functions.
2291  if (FD->hasPrototype()) {
2292  LinkageName = CGM.getMangledName(GD);
2293  Flags |= llvm::DINode::FlagPrototyped;
2294  }
2295  // No need to replicate the linkage name if it isn't different from the
2296  // subprogram name, no need to have it at all unless coverage is enabled or
2297  // debug is set to more than just line tables.
2298  if (LinkageName == Name ||
2299  (!CGM.getCodeGenOpts().EmitGcovArcs &&
2300  !CGM.getCodeGenOpts().EmitGcovNotes &&
2302  LinkageName = StringRef();
2303 
2304  if (DebugKind >= CodeGenOptions::LimitedDebugInfo) {
2305  if (const NamespaceDecl *NSDecl =
2306  dyn_cast_or_null<NamespaceDecl>(FD->getDeclContext()))
2307  FDContext = getOrCreateNameSpace(NSDecl);
2308  else if (const RecordDecl *RDecl =
2309  dyn_cast_or_null<RecordDecl>(FD->getDeclContext()))
2310  FDContext = getContextDescriptor(cast<Decl>(RDecl));
2311  // Collect template parameters.
2312  TParamsArray = CollectFunctionTemplateParams(FD, Unit);
2313  }
2314 }
2315 
2316 void CGDebugInfo::collectVarDeclProps(const VarDecl *VD, llvm::DIFile *&Unit,
2317  unsigned &LineNo, QualType &T,
2318  StringRef &Name, StringRef &LinkageName,
2319  llvm::DIScope *&VDContext) {
2320  Unit = getOrCreateFile(VD->getLocation());
2321  LineNo = getLineNumber(VD->getLocation());
2322 
2323  setLocation(VD->getLocation());
2324 
2325  T = VD->getType();
2326  if (T->isIncompleteArrayType()) {
2327  // CodeGen turns int[] into int[1] so we'll do the same here.
2328  llvm::APInt ConstVal(32, 1);
2329  QualType ET = CGM.getContext().getAsArrayType(T)->getElementType();
2330 
2331  T = CGM.getContext().getConstantArrayType(ET, ConstVal,
2332  ArrayType::Normal, 0);
2333  }
2334 
2335  Name = VD->getName();
2336  if (VD->getDeclContext() && !isa<FunctionDecl>(VD->getDeclContext()) &&
2337  !isa<ObjCMethodDecl>(VD->getDeclContext()))
2338  LinkageName = CGM.getMangledName(VD);
2339  if (LinkageName == Name)
2340  LinkageName = StringRef();
2341 
2342  // Since we emit declarations (DW_AT_members) for static members, place the
2343  // definition of those static members in the namespace they were declared in
2344  // in the source code (the lexical decl context).
2345  // FIXME: Generalize this for even non-member global variables where the
2346  // declaration and definition may have different lexical decl contexts, once
2347  // we have support for emitting declarations of (non-member) global variables.
2348  const DeclContext *DC = VD->isStaticDataMember() ? VD->getLexicalDeclContext()
2349  : VD->getDeclContext();
2350  // When a record type contains an in-line initialization of a static data
2351  // member, and the record type is marked as __declspec(dllexport), an implicit
2352  // definition of the member will be created in the record context. DWARF
2353  // doesn't seem to have a nice way to describe this in a form that consumers
2354  // are likely to understand, so fake the "normal" situation of a definition
2355  // outside the class by putting it in the global scope.
2356  if (DC->isRecord())
2357  DC = CGM.getContext().getTranslationUnitDecl();
2358  VDContext = getContextDescriptor(dyn_cast<Decl>(DC));
2359 }
2360 
2361 llvm::DISubprogram *
2362 CGDebugInfo::getFunctionForwardDeclaration(const FunctionDecl *FD) {
2363  llvm::DINodeArray TParamsArray;
2364  StringRef Name, LinkageName;
2365  unsigned Flags = 0;
2366  SourceLocation Loc = FD->getLocation();
2367  llvm::DIFile *Unit = getOrCreateFile(Loc);
2368  llvm::DIScope *DContext = Unit;
2369  unsigned Line = getLineNumber(Loc);
2370 
2371  collectFunctionDeclProps(FD, Unit, Name, LinkageName, DContext,
2372  TParamsArray, Flags);
2373  // Build function type.
2374  SmallVector<QualType, 16> ArgTypes;
2375  for (const ParmVarDecl *Parm: FD->parameters())
2376  ArgTypes.push_back(Parm->getType());
2377  QualType FnType =
2378  CGM.getContext().getFunctionType(FD->getReturnType(), ArgTypes,
2380  llvm::DISubprogram *SP = DBuilder.createTempFunctionFwdDecl(
2381  DContext, Name, LinkageName, Unit, Line,
2382  getOrCreateFunctionType(FD, FnType, Unit), !FD->isExternallyVisible(),
2383  false /*declaration*/, 0, Flags, CGM.getLangOpts().Optimize, nullptr,
2384  TParamsArray.get(), getFunctionDeclaration(FD));
2385  const FunctionDecl *CanonDecl = cast<FunctionDecl>(FD->getCanonicalDecl());
2386  FwdDeclReplaceMap.emplace_back(std::piecewise_construct,
2387  std::make_tuple(CanonDecl),
2388  std::make_tuple(SP));
2389  return SP;
2390 }
2391 
2392 llvm::DIGlobalVariable *
2393 CGDebugInfo::getGlobalVariableForwardDeclaration(const VarDecl *VD) {
2394  QualType T;
2395  StringRef Name, LinkageName;
2396  SourceLocation Loc = VD->getLocation();
2397  llvm::DIFile *Unit = getOrCreateFile(Loc);
2398  llvm::DIScope *DContext = Unit;
2399  unsigned Line = getLineNumber(Loc);
2400 
2401  collectVarDeclProps(VD, Unit, Line, T, Name, LinkageName, DContext);
2402  auto *GV = DBuilder.createTempGlobalVariableFwdDecl(
2403  DContext, Name, LinkageName, Unit, Line, getOrCreateType(T, Unit),
2404  !VD->isExternallyVisible(), nullptr, nullptr);
2405  FwdDeclReplaceMap.emplace_back(
2406  std::piecewise_construct,
2407  std::make_tuple(cast<VarDecl>(VD->getCanonicalDecl())),
2408  std::make_tuple(static_cast<llvm::Metadata *>(GV)));
2409  return GV;
2410 }
2411 
2412 llvm::DINode *CGDebugInfo::getDeclarationOrDefinition(const Decl *D) {
2413  // We only need a declaration (not a definition) of the type - so use whatever
2414  // we would otherwise do to get a type for a pointee. (forward declarations in
2415  // limited debug info, full definitions (if the type definition is available)
2416  // in unlimited debug info)
2417  if (const TypeDecl *TD = dyn_cast<TypeDecl>(D))
2418  return getOrCreateType(CGM.getContext().getTypeDeclType(TD),
2419  getOrCreateFile(TD->getLocation()));
2420  auto I = DeclCache.find(D->getCanonicalDecl());
2421 
2422  if (I != DeclCache.end())
2423  return dyn_cast_or_null<llvm::DINode>(I->second);
2424 
2425  // No definition for now. Emit a forward definition that might be
2426  // merged with a potential upcoming definition.
2427  if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D))
2428  return getFunctionForwardDeclaration(FD);
2429  else if (const auto *VD = dyn_cast<VarDecl>(D))
2430  return getGlobalVariableForwardDeclaration(VD);
2431 
2432  return nullptr;
2433 }
2434 
2435 llvm::DISubprogram *CGDebugInfo::getFunctionDeclaration(const Decl *D) {
2436  if (!D || DebugKind <= CodeGenOptions::DebugLineTablesOnly)
2437  return nullptr;
2438 
2439  const FunctionDecl *FD = dyn_cast<FunctionDecl>(D);
2440  if (!FD)
2441  return nullptr;
2442 
2443  // Setup context.
2444  auto *S = getContextDescriptor(cast<Decl>(D->getDeclContext()));
2445 
2446  auto MI = SPCache.find(FD->getCanonicalDecl());
2447  if (MI == SPCache.end()) {
2448  if (const CXXMethodDecl *MD =
2449  dyn_cast<CXXMethodDecl>(FD->getCanonicalDecl())) {
2450  return CreateCXXMemberFunction(MD, getOrCreateFile(MD->getLocation()),
2451  cast<llvm::DICompositeType>(S));
2452  }
2453  }
2454  if (MI != SPCache.end()) {
2455  auto *SP = dyn_cast_or_null<llvm::DISubprogram>(MI->second);
2456  if (SP && !SP->isDefinition())
2457  return SP;
2458  }
2459 
2460  for (auto NextFD : FD->redecls()) {
2461  auto MI = SPCache.find(NextFD->getCanonicalDecl());
2462  if (MI != SPCache.end()) {
2463  auto *SP = dyn_cast_or_null<llvm::DISubprogram>(MI->second);
2464  if (SP && !SP->isDefinition())
2465  return SP;
2466  }
2467  }
2468  return nullptr;
2469 }
2470 
2471 // getOrCreateFunctionType - Construct type. If it is a c++ method, include
2472 // implicit parameter "this".
2473 llvm::DISubroutineType *CGDebugInfo::getOrCreateFunctionType(const Decl *D,
2474  QualType FnType,
2475  llvm::DIFile *F) {
2476  if (!D || DebugKind <= CodeGenOptions::DebugLineTablesOnly)
2477  // Create fake but valid subroutine type. Otherwise -verify would fail, and
2478  // subprogram DIE will miss DW_AT_decl_file and DW_AT_decl_line fields.
2479  return DBuilder.createSubroutineType(F,
2480  DBuilder.getOrCreateTypeArray(None));
2481 
2482  if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D))
2483  return getOrCreateMethodType(Method, F);
2484  if (const ObjCMethodDecl *OMethod = dyn_cast<ObjCMethodDecl>(D)) {
2485  // Add "self" and "_cmd"
2487 
2488  // First element is always return type. For 'void' functions it is NULL.
2489  QualType ResultTy = OMethod->getReturnType();
2490 
2491  // Replace the instancetype keyword with the actual type.
2492  if (ResultTy == CGM.getContext().getObjCInstanceType())
2493  ResultTy = CGM.getContext().getPointerType(
2494  QualType(OMethod->getClassInterface()->getTypeForDecl(), 0));
2495 
2496  Elts.push_back(getOrCreateType(ResultTy, F));
2497  // "self" pointer is always first argument.
2498  QualType SelfDeclTy = OMethod->getSelfDecl()->getType();
2499  Elts.push_back(CreateSelfType(SelfDeclTy, getOrCreateType(SelfDeclTy, F)));
2500  // "_cmd" pointer is always second argument.
2501  Elts.push_back(DBuilder.createArtificialType(
2502  getOrCreateType(OMethod->getCmdDecl()->getType(), F)));
2503  // Get rest of the arguments.
2504  for (const auto *PI : OMethod->params())
2505  Elts.push_back(getOrCreateType(PI->getType(), F));
2506  // Variadic methods need a special marker at the end of the type list.
2507  if (OMethod->isVariadic())
2508  Elts.push_back(DBuilder.createUnspecifiedParameter());
2509 
2510  llvm::DITypeRefArray EltTypeArray = DBuilder.getOrCreateTypeArray(Elts);
2511  return DBuilder.createSubroutineType(F, EltTypeArray);
2512  }
2513 
2514  // Handle variadic function types; they need an additional
2515  // unspecified parameter.
2516  if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D))
2517  if (FD->isVariadic()) {
2519  EltTys.push_back(getOrCreateType(FD->getReturnType(), F));
2520  if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(FnType))
2521  for (unsigned i = 0, e = FPT->getNumParams(); i != e; ++i)
2522  EltTys.push_back(getOrCreateType(FPT->getParamType(i), F));
2523  EltTys.push_back(DBuilder.createUnspecifiedParameter());
2524  llvm::DITypeRefArray EltTypeArray = DBuilder.getOrCreateTypeArray(EltTys);
2525  return DBuilder.createSubroutineType(F, EltTypeArray);
2526  }
2527 
2528  return cast<llvm::DISubroutineType>(getOrCreateType(FnType, F));
2529 }
2530 
2531 void CGDebugInfo::EmitFunctionStart(GlobalDecl GD, SourceLocation Loc,
2532  SourceLocation ScopeLoc, QualType FnType,
2533  llvm::Function *Fn, CGBuilderTy &Builder) {
2534 
2535  StringRef Name;
2536  StringRef LinkageName;
2537 
2538  FnBeginRegionCount.push_back(LexicalBlockStack.size());
2539 
2540  const Decl *D = GD.getDecl();
2541  bool HasDecl = (D != nullptr);
2542 
2543  unsigned Flags = 0;
2544  llvm::DIFile *Unit = getOrCreateFile(Loc);
2545  llvm::DIScope *FDContext = Unit;
2546  llvm::DINodeArray TParamsArray;
2547  if (!HasDecl) {
2548  // Use llvm function name.
2549  LinkageName = Fn->getName();
2550  } else if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
2551  // If there is a subprogram for this function available then use it.
2552  auto FI = SPCache.find(FD->getCanonicalDecl());
2553  if (FI != SPCache.end()) {
2554  auto *SP = dyn_cast_or_null<llvm::DISubprogram>(FI->second);
2555  if (SP && SP->isDefinition()) {
2556  LexicalBlockStack.emplace_back(SP);
2557  RegionMap[D].reset(SP);
2558  return;
2559  }
2560  }
2561  collectFunctionDeclProps(GD, Unit, Name, LinkageName, FDContext,
2562  TParamsArray, Flags);
2563  } else if (const ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(D)) {
2564  Name = getObjCMethodName(OMD);
2565  Flags |= llvm::DINode::FlagPrototyped;
2566  } else {
2567  // Use llvm function name.
2568  Name = Fn->getName();
2569  Flags |= llvm::DINode::FlagPrototyped;
2570  }
2571  if (!Name.empty() && Name[0] == '\01')
2572  Name = Name.substr(1);
2573 
2574  if (!HasDecl || D->isImplicit()) {
2575  Flags |= llvm::DINode::FlagArtificial;
2576  // Artificial functions without a location should not silently reuse CurLoc.
2577  if (Loc.isInvalid())
2578  CurLoc = SourceLocation();
2579  }
2580  unsigned LineNo = getLineNumber(Loc);
2581  unsigned ScopeLine = getLineNumber(ScopeLoc);
2582 
2583  // FIXME: The function declaration we're constructing here is mostly reusing
2584  // declarations from CXXMethodDecl and not constructing new ones for arbitrary
2585  // FunctionDecls. When/if we fix this we can have FDContext be TheCU/null for
2586  // all subprograms instead of the actual context since subprogram definitions
2587  // are emitted as CU level entities by the backend.
2588  llvm::DISubprogram *SP = DBuilder.createFunction(
2589  FDContext, Name, LinkageName, Unit, LineNo,
2590  getOrCreateFunctionType(D, FnType, Unit), Fn->hasInternalLinkage(),
2591  true /*definition*/, ScopeLine, Flags, CGM.getLangOpts().Optimize, Fn,
2592  TParamsArray.get(), getFunctionDeclaration(D));
2593  // We might get here with a VarDecl in the case we're generating
2594  // code for the initialization of globals. Do not record these decls
2595  // as they will overwrite the actual VarDecl Decl in the cache.
2596  if (HasDecl && isa<FunctionDecl>(D))
2597  DeclCache[D->getCanonicalDecl()].reset(static_cast<llvm::Metadata *>(SP));
2598 
2599  // Push the function onto the lexical block stack.
2600  LexicalBlockStack.emplace_back(SP);
2601 
2602  if (HasDecl)
2603  RegionMap[D].reset(SP);
2604 }
2605 
2607  // Update our current location
2608  setLocation(Loc);
2609 
2610  if (CurLoc.isInvalid() || CurLoc.isMacroID())
2611  return;
2612 
2613  llvm::MDNode *Scope = LexicalBlockStack.back();
2614  Builder.SetCurrentDebugLocation(llvm::DebugLoc::get(
2615  getLineNumber(CurLoc), getColumnNumber(CurLoc), Scope));
2616 }
2617 
2618 void CGDebugInfo::CreateLexicalBlock(SourceLocation Loc) {
2619  llvm::MDNode *Back = nullptr;
2620  if (!LexicalBlockStack.empty())
2621  Back = LexicalBlockStack.back().get();
2622  LexicalBlockStack.emplace_back(DBuilder.createLexicalBlock(
2623  cast<llvm::DIScope>(Back), getOrCreateFile(CurLoc), getLineNumber(CurLoc),
2624  getColumnNumber(CurLoc)));
2625 }
2626 
2627 void CGDebugInfo::EmitLexicalBlockStart(CGBuilderTy &Builder,
2628  SourceLocation Loc) {
2629  // Set our current location.
2630  setLocation(Loc);
2631 
2632  // Emit a line table change for the current location inside the new scope.
2633  Builder.SetCurrentDebugLocation(llvm::DebugLoc::get(
2634  getLineNumber(Loc), getColumnNumber(Loc), LexicalBlockStack.back()));
2635 
2636  if (DebugKind <= CodeGenOptions::DebugLineTablesOnly)
2637  return;
2638 
2639  // Create a new lexical block and push it on the stack.
2640  CreateLexicalBlock(Loc);
2641 }
2642 
2643 void CGDebugInfo::EmitLexicalBlockEnd(CGBuilderTy &Builder,
2644  SourceLocation Loc) {
2645  assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
2646 
2647  // Provide an entry in the line table for the end of the block.
2648  EmitLocation(Builder, Loc);
2649 
2650  if (DebugKind <= CodeGenOptions::DebugLineTablesOnly)
2651  return;
2652 
2653  LexicalBlockStack.pop_back();
2654 }
2655 
2656 void CGDebugInfo::EmitFunctionEnd(CGBuilderTy &Builder) {
2657  assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
2658  unsigned RCount = FnBeginRegionCount.back();
2659  assert(RCount <= LexicalBlockStack.size() && "Region stack mismatch");
2660 
2661  // Pop all regions for this function.
2662  while (LexicalBlockStack.size() != RCount) {
2663  // Provide an entry in the line table for the end of the block.
2664  EmitLocation(Builder, CurLoc);
2665  LexicalBlockStack.pop_back();
2666  }
2667  FnBeginRegionCount.pop_back();
2668 }
2669 
2670 llvm::DIType *CGDebugInfo::EmitTypeForVarWithBlocksAttr(const VarDecl *VD,
2671  uint64_t *XOffset) {
2672 
2674  QualType FType;
2675  uint64_t FieldSize, FieldOffset;
2676  unsigned FieldAlign;
2677 
2678  llvm::DIFile *Unit = getOrCreateFile(VD->getLocation());
2679  QualType Type = VD->getType();
2680 
2681  FieldOffset = 0;
2682  FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
2683  EltTys.push_back(CreateMemberType(Unit, FType, "__isa", &FieldOffset));
2684  EltTys.push_back(CreateMemberType(Unit, FType, "__forwarding", &FieldOffset));
2685  FType = CGM.getContext().IntTy;
2686  EltTys.push_back(CreateMemberType(Unit, FType, "__flags", &FieldOffset));
2687  EltTys.push_back(CreateMemberType(Unit, FType, "__size", &FieldOffset));
2688 
2689  bool HasCopyAndDispose = CGM.getContext().BlockRequiresCopying(Type, VD);
2690  if (HasCopyAndDispose) {
2691  FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
2692  EltTys.push_back(
2693  CreateMemberType(Unit, FType, "__copy_helper", &FieldOffset));
2694  EltTys.push_back(
2695  CreateMemberType(Unit, FType, "__destroy_helper", &FieldOffset));
2696  }
2697  bool HasByrefExtendedLayout;
2698  Qualifiers::ObjCLifetime Lifetime;
2699  if (CGM.getContext().getByrefLifetime(Type, Lifetime,
2700  HasByrefExtendedLayout) &&
2701  HasByrefExtendedLayout) {
2702  FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
2703  EltTys.push_back(
2704  CreateMemberType(Unit, FType, "__byref_variable_layout", &FieldOffset));
2705  }
2706 
2707  CharUnits Align = CGM.getContext().getDeclAlign(VD);
2708  if (Align > CGM.getContext().toCharUnitsFromBits(
2709  CGM.getTarget().getPointerAlign(0))) {
2710  CharUnits FieldOffsetInBytes =
2711  CGM.getContext().toCharUnitsFromBits(FieldOffset);
2712  CharUnits AlignedOffsetInBytes =
2713  FieldOffsetInBytes.RoundUpToAlignment(Align);
2714  CharUnits NumPaddingBytes = AlignedOffsetInBytes - FieldOffsetInBytes;
2715 
2716  if (NumPaddingBytes.isPositive()) {
2717  llvm::APInt pad(32, NumPaddingBytes.getQuantity());
2718  FType = CGM.getContext().getConstantArrayType(CGM.getContext().CharTy,
2719  pad, ArrayType::Normal, 0);
2720  EltTys.push_back(CreateMemberType(Unit, FType, "", &FieldOffset));
2721  }
2722  }
2723 
2724  FType = Type;
2725  llvm::DIType *FieldTy = getOrCreateType(FType, Unit);
2726  FieldSize = CGM.getContext().getTypeSize(FType);
2727  FieldAlign = CGM.getContext().toBits(Align);
2728 
2729  *XOffset = FieldOffset;
2730  FieldTy = DBuilder.createMemberType(Unit, VD->getName(), Unit, 0, FieldSize,
2731  FieldAlign, FieldOffset, 0, FieldTy);
2732  EltTys.push_back(FieldTy);
2733  FieldOffset += FieldSize;
2734 
2735  llvm::DINodeArray Elements = DBuilder.getOrCreateArray(EltTys);
2736 
2737  unsigned Flags = llvm::DINode::FlagBlockByrefStruct;
2738 
2739  return DBuilder.createStructType(Unit, "", Unit, 0, FieldOffset, 0, Flags,
2740  nullptr, Elements);
2741 }
2742 
2743 void CGDebugInfo::EmitDeclare(const VarDecl *VD, llvm::dwarf::Tag Tag,
2744  llvm::Value *Storage, unsigned ArgNo,
2745  CGBuilderTy &Builder) {
2746  assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
2747  assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
2748 
2749  bool Unwritten =
2750  VD->isImplicit() || (isa<Decl>(VD->getDeclContext()) &&
2751  cast<Decl>(VD->getDeclContext())->isImplicit());
2752  llvm::DIFile *Unit = nullptr;
2753  if (!Unwritten)
2754  Unit = getOrCreateFile(VD->getLocation());
2755  llvm::DIType *Ty;
2756  uint64_t XOffset = 0;
2757  if (VD->hasAttr<BlocksAttr>())
2758  Ty = EmitTypeForVarWithBlocksAttr(VD, &XOffset);
2759  else
2760  Ty = getOrCreateType(VD->getType(), Unit);
2761 
2762  // If there is no debug info for this type then do not emit debug info
2763  // for this variable.
2764  if (!Ty)
2765  return;
2766 
2767  // Get location information.
2768  unsigned Line = 0;
2769  unsigned Column = 0;
2770  if (!Unwritten) {
2771  Line = getLineNumber(VD->getLocation());
2772  Column = getColumnNumber(VD->getLocation());
2773  }
2775  unsigned Flags = 0;
2776  if (VD->isImplicit())
2777  Flags |= llvm::DINode::FlagArtificial;
2778  // If this is the first argument and it is implicit then
2779  // give it an object pointer flag.
2780  // FIXME: There has to be a better way to do this, but for static
2781  // functions there won't be an implicit param at arg1 and
2782  // otherwise it is 'self' or 'this'.
2783  if (isa<ImplicitParamDecl>(VD) && ArgNo == 1)
2784  Flags |= llvm::DINode::FlagObjectPointer;
2785  if (llvm::Argument *Arg = dyn_cast<llvm::Argument>(Storage))
2786  if (Arg->getType()->isPointerTy() && !Arg->hasByValAttr() &&
2787  !VD->getType()->isPointerType())
2788  Expr.push_back(llvm::dwarf::DW_OP_deref);
2789 
2790  auto *Scope = cast<llvm::DIScope>(LexicalBlockStack.back());
2791 
2792  StringRef Name = VD->getName();
2793  if (!Name.empty()) {
2794  if (VD->hasAttr<BlocksAttr>()) {
2795  CharUnits offset = CharUnits::fromQuantity(32);
2796  Expr.push_back(llvm::dwarf::DW_OP_plus);
2797  // offset of __forwarding field
2798  offset = CGM.getContext().toCharUnitsFromBits(
2799  CGM.getTarget().getPointerWidth(0));
2800  Expr.push_back(offset.getQuantity());
2801  Expr.push_back(llvm::dwarf::DW_OP_deref);
2802  Expr.push_back(llvm::dwarf::DW_OP_plus);
2803  // offset of x field
2804  offset = CGM.getContext().toCharUnitsFromBits(XOffset);
2805  Expr.push_back(offset.getQuantity());
2806 
2807  // Create the descriptor for the variable.
2808  auto *D = DBuilder.createLocalVariable(Tag, Scope, VD->getName(), Unit,
2809  Line, Ty, ArgNo);
2810 
2811  // Insert an llvm.dbg.declare into the current block.
2812  DBuilder.insertDeclare(Storage, D, DBuilder.createExpression(Expr),
2813  llvm::DebugLoc::get(Line, Column, Scope),
2814  Builder.GetInsertBlock());
2815  return;
2816  } else if (isa<VariableArrayType>(VD->getType()))
2817  Expr.push_back(llvm::dwarf::DW_OP_deref);
2818  } else if (const RecordType *RT = dyn_cast<RecordType>(VD->getType())) {
2819  // If VD is an anonymous union then Storage represents value for
2820  // all union fields.
2821  const RecordDecl *RD = cast<RecordDecl>(RT->getDecl());
2822  if (RD->isUnion() && RD->isAnonymousStructOrUnion()) {
2823  // GDB has trouble finding local variables in anonymous unions, so we emit
2824  // artifical local variables for each of the members.
2825  //
2826  // FIXME: Remove this code as soon as GDB supports this.
2827  // The debug info verifier in LLVM operates based on the assumption that a
2828  // variable has the same size as its storage and we had to disable the check
2829  // for artificial variables.
2830  for (const auto *Field : RD->fields()) {
2831  llvm::DIType *FieldTy = getOrCreateType(Field->getType(), Unit);
2832  StringRef FieldName = Field->getName();
2833 
2834  // Ignore unnamed fields. Do not ignore unnamed records.
2835  if (FieldName.empty() && !isa<RecordType>(Field->getType()))
2836  continue;
2837 
2838  // Use VarDecl's Tag, Scope and Line number.
2839  auto *D = DBuilder.createLocalVariable(
2840  Tag, Scope, FieldName, Unit, Line, FieldTy,
2841  CGM.getLangOpts().Optimize, Flags | llvm::DINode::FlagArtificial,
2842  ArgNo);
2843 
2844  // Insert an llvm.dbg.declare into the current block.
2845  DBuilder.insertDeclare(Storage, D, DBuilder.createExpression(Expr),
2846  llvm::DebugLoc::get(Line, Column, Scope),
2847  Builder.GetInsertBlock());
2848  }
2849  }
2850  }
2851 
2852  // Create the descriptor for the variable.
2853  auto *D =
2854  DBuilder.createLocalVariable(Tag, Scope, Name, Unit, Line, Ty,
2855  CGM.getLangOpts().Optimize, Flags, ArgNo);
2856 
2857  // Insert an llvm.dbg.declare into the current block.
2858  DBuilder.insertDeclare(Storage, D, DBuilder.createExpression(Expr),
2859  llvm::DebugLoc::get(Line, Column, Scope),
2860  Builder.GetInsertBlock());
2861 }
2862 
2863 void CGDebugInfo::EmitDeclareOfAutoVariable(const VarDecl *VD,
2864  llvm::Value *Storage,
2865  CGBuilderTy &Builder) {
2866  assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
2867  EmitDeclare(VD, llvm::dwarf::DW_TAG_auto_variable, Storage, 0, Builder);
2868 }
2869 
2870 llvm::DIType *CGDebugInfo::CreateSelfType(const QualType &QualTy,
2871  llvm::DIType *Ty) {
2872  llvm::DIType *CachedTy = getTypeOrNull(QualTy);
2873  if (CachedTy)
2874  Ty = CachedTy;
2875  return DBuilder.createObjectPointerType(Ty);
2876 }
2877 
2878 void CGDebugInfo::EmitDeclareOfBlockDeclRefVariable(
2879  const VarDecl *VD, llvm::Value *Storage, CGBuilderTy &Builder,
2880  const CGBlockInfo &blockInfo, llvm::Instruction *InsertPoint) {
2881  assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
2882  assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
2883 
2884  if (Builder.GetInsertBlock() == nullptr)
2885  return;
2886 
2887  bool isByRef = VD->hasAttr<BlocksAttr>();
2888 
2889  uint64_t XOffset = 0;
2890  llvm::DIFile *Unit = getOrCreateFile(VD->getLocation());
2891  llvm::DIType *Ty;
2892  if (isByRef)
2893  Ty = EmitTypeForVarWithBlocksAttr(VD, &XOffset);
2894  else
2895  Ty = getOrCreateType(VD->getType(), Unit);
2896 
2897  // Self is passed along as an implicit non-arg variable in a
2898  // block. Mark it as the object pointer.
2899  if (isa<ImplicitParamDecl>(VD) && VD->getName() == "self")
2900  Ty = CreateSelfType(VD->getType(), Ty);
2901 
2902  // Get location information.
2903  unsigned Line = getLineNumber(VD->getLocation());
2904  unsigned Column = getColumnNumber(VD->getLocation());
2905 
2906  const llvm::DataLayout &target = CGM.getDataLayout();
2907 
2909  target.getStructLayout(blockInfo.StructureType)
2910  ->getElementOffset(blockInfo.getCapture(VD).getIndex()));
2911 
2913  if (isa<llvm::AllocaInst>(Storage))
2914  addr.push_back(llvm::dwarf::DW_OP_deref);
2915  addr.push_back(llvm::dwarf::DW_OP_plus);
2916  addr.push_back(offset.getQuantity());
2917  if (isByRef) {
2918  addr.push_back(llvm::dwarf::DW_OP_deref);
2919  addr.push_back(llvm::dwarf::DW_OP_plus);
2920  // offset of __forwarding field
2921  offset =
2922  CGM.getContext().toCharUnitsFromBits(target.getPointerSizeInBits(0));
2923  addr.push_back(offset.getQuantity());
2924  addr.push_back(llvm::dwarf::DW_OP_deref);
2925  addr.push_back(llvm::dwarf::DW_OP_plus);
2926  // offset of x field
2927  offset = CGM.getContext().toCharUnitsFromBits(XOffset);
2928  addr.push_back(offset.getQuantity());
2929  }
2930 
2931  // Create the descriptor for the variable.
2932  auto *D = DBuilder.createLocalVariable(
2933  llvm::dwarf::DW_TAG_auto_variable,
2934  cast<llvm::DILocalScope>(LexicalBlockStack.back()), VD->getName(), Unit,
2935  Line, Ty);
2936 
2937  // Insert an llvm.dbg.declare into the current block.
2938  auto DL = llvm::DebugLoc::get(Line, Column, LexicalBlockStack.back());
2939  if (InsertPoint)
2940  DBuilder.insertDeclare(Storage, D, DBuilder.createExpression(addr), DL,
2941  InsertPoint);
2942  else
2943  DBuilder.insertDeclare(Storage, D, DBuilder.createExpression(addr), DL,
2944  Builder.GetInsertBlock());
2945 }
2946 
2947 void CGDebugInfo::EmitDeclareOfArgVariable(const VarDecl *VD, llvm::Value *AI,
2948  unsigned ArgNo,
2949  CGBuilderTy &Builder) {
2950  assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
2951  EmitDeclare(VD, llvm::dwarf::DW_TAG_arg_variable, AI, ArgNo, Builder);
2952 }
2953 
2954 namespace {
2955 struct BlockLayoutChunk {
2956  uint64_t OffsetInBits;
2957  const BlockDecl::Capture *Capture;
2958 };
2959 bool operator<(const BlockLayoutChunk &l, const BlockLayoutChunk &r) {
2960  return l.OffsetInBits < r.OffsetInBits;
2961 }
2962 }
2963 
2964 void CGDebugInfo::EmitDeclareOfBlockLiteralArgVariable(const CGBlockInfo &block,
2965  llvm::Value *Arg,
2966  unsigned ArgNo,
2967  llvm::Value *LocalAddr,
2968  CGBuilderTy &Builder) {
2969  assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
2970  ASTContext &C = CGM.getContext();
2971  const BlockDecl *blockDecl = block.getBlockDecl();
2972 
2973  // Collect some general information about the block's location.
2974  SourceLocation loc = blockDecl->getCaretLocation();
2975  llvm::DIFile *tunit = getOrCreateFile(loc);
2976  unsigned line = getLineNumber(loc);
2977  unsigned column = getColumnNumber(loc);
2978 
2979  // Build the debug-info type for the block literal.
2980  getContextDescriptor(cast<Decl>(blockDecl->getDeclContext()));
2981 
2982  const llvm::StructLayout *blockLayout =
2983  CGM.getDataLayout().getStructLayout(block.StructureType);
2984 
2986  fields.push_back(createFieldType("__isa", C.VoidPtrTy, 0, loc, AS_public,
2987  blockLayout->getElementOffsetInBits(0),
2988  tunit, tunit));
2989  fields.push_back(createFieldType("__flags", C.IntTy, 0, loc, AS_public,
2990  blockLayout->getElementOffsetInBits(1),
2991  tunit, tunit));
2992  fields.push_back(createFieldType("__reserved", C.IntTy, 0, loc, AS_public,
2993  blockLayout->getElementOffsetInBits(2),
2994  tunit, tunit));
2995  auto *FnTy = block.getBlockExpr()->getFunctionType();
2996  auto FnPtrType = CGM.getContext().getPointerType(FnTy->desugar());
2997  fields.push_back(createFieldType("__FuncPtr", FnPtrType, 0, loc, AS_public,
2998  blockLayout->getElementOffsetInBits(3),
2999  tunit, tunit));
3000  fields.push_back(createFieldType(
3001  "__descriptor", C.getPointerType(block.NeedsCopyDispose
3003  : C.getBlockDescriptorType()),
3004  0, loc, AS_public, blockLayout->getElementOffsetInBits(4), tunit, tunit));
3005 
3006  // We want to sort the captures by offset, not because DWARF
3007  // requires this, but because we're paranoid about debuggers.
3009 
3010  // 'this' capture.
3011  if (blockDecl->capturesCXXThis()) {
3012  BlockLayoutChunk chunk;
3013  chunk.OffsetInBits =
3014  blockLayout->getElementOffsetInBits(block.CXXThisIndex);
3015  chunk.Capture = nullptr;
3016  chunks.push_back(chunk);
3017  }
3018 
3019  // Variable captures.
3020  for (const auto &capture : blockDecl->captures()) {
3021  const VarDecl *variable = capture.getVariable();
3022  const CGBlockInfo::Capture &captureInfo = block.getCapture(variable);
3023 
3024  // Ignore constant captures.
3025  if (captureInfo.isConstant())
3026  continue;
3027 
3028  BlockLayoutChunk chunk;
3029  chunk.OffsetInBits =
3030  blockLayout->getElementOffsetInBits(captureInfo.getIndex());
3031  chunk.Capture = &capture;
3032  chunks.push_back(chunk);
3033  }
3034 
3035  // Sort by offset.
3036  llvm::array_pod_sort(chunks.begin(), chunks.end());
3037 
3038  for (SmallVectorImpl<BlockLayoutChunk>::iterator i = chunks.begin(),
3039  e = chunks.end();
3040  i != e; ++i) {
3041  uint64_t offsetInBits = i->OffsetInBits;
3042  const BlockDecl::Capture *capture = i->Capture;
3043 
3044  // If we have a null capture, this must be the C++ 'this' capture.
3045  if (!capture) {
3046  const CXXMethodDecl *method =
3047  cast<CXXMethodDecl>(blockDecl->getNonClosureContext());
3048  QualType type = method->getThisType(C);
3049 
3050  fields.push_back(createFieldType("this", type, 0, loc, AS_public,
3051  offsetInBits, tunit, tunit));
3052  continue;
3053  }
3054 
3055  const VarDecl *variable = capture->getVariable();
3056  StringRef name = variable->getName();
3057 
3058  llvm::DIType *fieldType;
3059  if (capture->isByRef()) {
3060  TypeInfo PtrInfo = C.getTypeInfo(C.VoidPtrTy);
3061 
3062  // FIXME: this creates a second copy of this type!
3063  uint64_t xoffset;
3064  fieldType = EmitTypeForVarWithBlocksAttr(variable, &xoffset);
3065  fieldType = DBuilder.createPointerType(fieldType, PtrInfo.Width);
3066  fieldType =
3067  DBuilder.createMemberType(tunit, name, tunit, line, PtrInfo.Width,
3068  PtrInfo.Align, offsetInBits, 0, fieldType);
3069  } else {
3070  fieldType = createFieldType(name, variable->getType(), 0, loc, AS_public,
3071  offsetInBits, tunit, tunit);
3072  }
3073  fields.push_back(fieldType);
3074  }
3075 
3076  SmallString<36> typeName;
3077  llvm::raw_svector_ostream(typeName) << "__block_literal_"
3078  << CGM.getUniqueBlockCount();
3079 
3080  llvm::DINodeArray fieldsArray = DBuilder.getOrCreateArray(fields);
3081 
3082  llvm::DIType *type = DBuilder.createStructType(
3083  tunit, typeName.str(), tunit, line,
3084  CGM.getContext().toBits(block.BlockSize),
3085  CGM.getContext().toBits(block.BlockAlign), 0, nullptr, fieldsArray);
3086  type = DBuilder.createPointerType(type, CGM.PointerWidthInBits);
3087 
3088  // Get overall information about the block.
3089  unsigned flags = llvm::DINode::FlagArtificial;
3090  auto *scope = cast<llvm::DILocalScope>(LexicalBlockStack.back());
3091 
3092  // Create the descriptor for the parameter.
3093  auto *debugVar = DBuilder.createLocalVariable(
3094  llvm::dwarf::DW_TAG_arg_variable, scope, Arg->getName(), tunit, line,
3095  type, CGM.getLangOpts().Optimize, flags, ArgNo);
3096 
3097  if (LocalAddr) {
3098  // Insert an llvm.dbg.value into the current block.
3099  DBuilder.insertDbgValueIntrinsic(
3100  LocalAddr, 0, debugVar, DBuilder.createExpression(),
3101  llvm::DebugLoc::get(line, column, scope), Builder.GetInsertBlock());
3102  }
3103 
3104  // Insert an llvm.dbg.declare into the current block.
3105  DBuilder.insertDeclare(Arg, debugVar, DBuilder.createExpression(),
3106  llvm::DebugLoc::get(line, column, scope),
3107  Builder.GetInsertBlock());
3108 }
3109 
3110 llvm::DIDerivedType *
3111 CGDebugInfo::getOrCreateStaticDataMemberDeclarationOrNull(const VarDecl *D) {
3112  if (!D->isStaticDataMember())
3113  return nullptr;
3114 
3115  auto MI = StaticDataMemberCache.find(D->getCanonicalDecl());
3116  if (MI != StaticDataMemberCache.end()) {
3117  assert(MI->second && "Static data member declaration should still exist");
3118  return cast<llvm::DIDerivedType>(MI->second);
3119  }
3120 
3121  // If the member wasn't found in the cache, lazily construct and add it to the
3122  // type (used when a limited form of the type is emitted).
3123  auto DC = D->getDeclContext();
3124  auto *Ctxt =
3125  cast<llvm::DICompositeType>(getContextDescriptor(cast<Decl>(DC)));
3126  return CreateRecordStaticField(D, Ctxt, cast<RecordDecl>(DC));
3127 }
3128 
3129 llvm::DIGlobalVariable *CGDebugInfo::CollectAnonRecordDecls(
3130  const RecordDecl *RD, llvm::DIFile *Unit, unsigned LineNo,
3131  StringRef LinkageName, llvm::GlobalVariable *Var, llvm::DIScope *DContext) {
3132  llvm::DIGlobalVariable *GV = nullptr;
3133 
3134  for (const auto *Field : RD->fields()) {
3135  llvm::DIType *FieldTy = getOrCreateType(Field->getType(), Unit);
3136  StringRef FieldName = Field->getName();
3137 
3138  // Ignore unnamed fields, but recurse into anonymous records.
3139  if (FieldName.empty()) {
3140  const RecordType *RT = dyn_cast<RecordType>(Field->getType());
3141  if (RT)
3142  GV = CollectAnonRecordDecls(RT->getDecl(), Unit, LineNo, LinkageName,
3143  Var, DContext);
3144  continue;
3145  }
3146  // Use VarDecl's Tag, Scope and Line number.
3147  GV = DBuilder.createGlobalVariable(DContext, FieldName, LinkageName, Unit,
3148  LineNo, FieldTy,
3149  Var->hasInternalLinkage(), Var, nullptr);
3150  }
3151  return GV;
3152 }
3153 
3154 void CGDebugInfo::EmitGlobalVariable(llvm::GlobalVariable *Var,
3155  const VarDecl *D) {
3156  assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
3157  // Create global variable debug descriptor.
3158  llvm::DIFile *Unit = nullptr;
3159  llvm::DIScope *DContext = nullptr;
3160  unsigned LineNo;
3161  StringRef DeclName, LinkageName;
3162  QualType T;
3163  collectVarDeclProps(D, Unit, LineNo, T, DeclName, LinkageName, DContext);
3164 
3165  // Attempt to store one global variable for the declaration - even if we
3166  // emit a lot of fields.
3167  llvm::DIGlobalVariable *GV = nullptr;
3168 
3169  // If this is an anonymous union then we'll want to emit a global
3170  // variable for each member of the anonymous union so that it's possible
3171  // to find the name of any field in the union.
3172  if (T->isUnionType() && DeclName.empty()) {
3173  const RecordDecl *RD = cast<RecordType>(T)->getDecl();
3174  assert(RD->isAnonymousStructOrUnion() &&
3175  "unnamed non-anonymous struct or union?");
3176  GV = CollectAnonRecordDecls(RD, Unit, LineNo, LinkageName, Var, DContext);
3177  } else {
3178  GV = DBuilder.createGlobalVariable(
3179  DContext, DeclName, LinkageName, Unit, LineNo, getOrCreateType(T, Unit),
3180  Var->hasInternalLinkage(), Var,
3181  getOrCreateStaticDataMemberDeclarationOrNull(D));
3182  }
3183  DeclCache[D->getCanonicalDecl()].reset(static_cast<llvm::Metadata *>(GV));
3184 }
3185 
3186 void CGDebugInfo::EmitGlobalVariable(const ValueDecl *VD,
3187  llvm::Constant *Init) {
3188  assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
3189  // Create the descriptor for the variable.
3190  llvm::DIFile *Unit = getOrCreateFile(VD->getLocation());
3191  StringRef Name = VD->getName();
3192  llvm::DIType *Ty = getOrCreateType(VD->getType(), Unit);
3193  if (const EnumConstantDecl *ECD = dyn_cast<EnumConstantDecl>(VD)) {
3194  const EnumDecl *ED = cast<EnumDecl>(ECD->getDeclContext());
3195  assert(isa<EnumType>(ED->getTypeForDecl()) && "Enum without EnumType?");
3196  Ty = getOrCreateType(QualType(ED->getTypeForDecl(), 0), Unit);
3197  }
3198  // Do not use global variables for enums.
3199  //
3200  // FIXME: why not?
3201  if (Ty->getTag() == llvm::dwarf::DW_TAG_enumeration_type)
3202  return;
3203  // Do not emit separate definitions for function local const/statics.
3204  if (isa<FunctionDecl>(VD->getDeclContext()))
3205  return;
3206  VD = cast<ValueDecl>(VD->getCanonicalDecl());
3207  auto *VarD = cast<VarDecl>(VD);
3208  if (VarD->isStaticDataMember()) {
3209  auto *RD = cast<RecordDecl>(VarD->getDeclContext());
3210  getContextDescriptor(RD);
3211  // Ensure that the type is retained even though it's otherwise unreferenced.
3212  RetainedTypes.push_back(
3213  CGM.getContext().getRecordType(RD).getAsOpaquePtr());
3214  return;
3215  }
3216 
3217  llvm::DIScope *DContext =
3218  getContextDescriptor(dyn_cast<Decl>(VD->getDeclContext()));
3219 
3220  auto &GV = DeclCache[VD];
3221  if (GV)
3222  return;
3223  GV.reset(DBuilder.createGlobalVariable(
3224  DContext, Name, StringRef(), Unit, getLineNumber(VD->getLocation()), Ty,
3225  true, Init, getOrCreateStaticDataMemberDeclarationOrNull(VarD)));
3226 }
3227 
3228 llvm::DIScope *CGDebugInfo::getCurrentContextDescriptor(const Decl *D) {
3229  if (!LexicalBlockStack.empty())
3230  return LexicalBlockStack.back();
3231  return getContextDescriptor(D);
3232 }
3233 
3234 void CGDebugInfo::EmitUsingDirective(const UsingDirectiveDecl &UD) {
3235  if (CGM.getCodeGenOpts().getDebugInfo() < CodeGenOptions::LimitedDebugInfo)
3236  return;
3237  DBuilder.createImportedModule(
3238  getCurrentContextDescriptor(cast<Decl>(UD.getDeclContext())),
3239  getOrCreateNameSpace(UD.getNominatedNamespace()),
3240  getLineNumber(UD.getLocation()));
3241 }
3242 
3243 void CGDebugInfo::EmitUsingDecl(const UsingDecl &UD) {
3244  if (CGM.getCodeGenOpts().getDebugInfo() < CodeGenOptions::LimitedDebugInfo)
3245  return;
3246  assert(UD.shadow_size() &&
3247  "We shouldn't be codegening an invalid UsingDecl containing no decls");
3248  // Emitting one decl is sufficient - debuggers can detect that this is an
3249  // overloaded name & provide lookup for all the overloads.
3250  const UsingShadowDecl &USD = **UD.shadow_begin();
3251  if (llvm::DINode *Target =
3252  getDeclarationOrDefinition(USD.getUnderlyingDecl()))
3253  DBuilder.createImportedDeclaration(
3254  getCurrentContextDescriptor(cast<Decl>(USD.getDeclContext())), Target,
3255  getLineNumber(USD.getLocation()));
3256 }
3257 
3258 void CGDebugInfo::EmitImportDecl(const ImportDecl &ID) {
3259  auto *Reader = CGM.getContext().getExternalSource();
3260  auto Info = Reader->getSourceDescriptor(*ID.getImportedModule());
3261  DBuilder.createImportedDeclaration(
3262  getCurrentContextDescriptor(cast<Decl>(ID.getDeclContext())),
3263  getOrCreateModuleRef(Info),
3264  getLineNumber(ID.getLocation()));
3265 }
3266 
3267 llvm::DIImportedEntity *
3268 CGDebugInfo::EmitNamespaceAlias(const NamespaceAliasDecl &NA) {
3269  if (CGM.getCodeGenOpts().getDebugInfo() < CodeGenOptions::LimitedDebugInfo)
3270  return nullptr;
3271  auto &VH = NamespaceAliasCache[&NA];
3272  if (VH)
3273  return cast<llvm::DIImportedEntity>(VH);
3274  llvm::DIImportedEntity *R;
3275  if (const NamespaceAliasDecl *Underlying =
3276  dyn_cast<NamespaceAliasDecl>(NA.getAliasedNamespace()))
3277  // This could cache & dedup here rather than relying on metadata deduping.
3278  R = DBuilder.createImportedDeclaration(
3279  getCurrentContextDescriptor(cast<Decl>(NA.getDeclContext())),
3280  EmitNamespaceAlias(*Underlying), getLineNumber(NA.getLocation()),
3281  NA.getName());
3282  else
3283  R = DBuilder.createImportedDeclaration(
3284  getCurrentContextDescriptor(cast<Decl>(NA.getDeclContext())),
3285  getOrCreateNameSpace(cast<NamespaceDecl>(NA.getAliasedNamespace())),
3286  getLineNumber(NA.getLocation()), NA.getName());
3287  VH.reset(R);
3288  return R;
3289 }
3290 
3291 llvm::DINamespace *
3292 CGDebugInfo::getOrCreateNameSpace(const NamespaceDecl *NSDecl) {
3293  NSDecl = NSDecl->getCanonicalDecl();
3294  auto I = NameSpaceCache.find(NSDecl);
3295  if (I != NameSpaceCache.end())
3296  return cast<llvm::DINamespace>(I->second);
3297 
3298  unsigned LineNo = getLineNumber(NSDecl->getLocation());
3299  llvm::DIFile *FileD = getOrCreateFile(NSDecl->getLocation());
3300  llvm::DIScope *Context =
3301  getContextDescriptor(dyn_cast<Decl>(NSDecl->getDeclContext()));
3302  llvm::DINamespace *NS =
3303  DBuilder.createNameSpace(Context, NSDecl->getName(), FileD, LineNo);
3304  NameSpaceCache[NSDecl].reset(NS);
3305  return NS;
3306 }
3307 
3308 void CGDebugInfo::finalize() {
3309  // Creating types might create further types - invalidating the current
3310  // element and the size(), so don't cache/reference them.
3311  for (size_t i = 0; i != ObjCInterfaceCache.size(); ++i) {
3312  ObjCInterfaceCacheEntry E = ObjCInterfaceCache[i];
3313  llvm::DIType *Ty = E.Type->getDecl()->getDefinition()
3314  ? CreateTypeDefinition(E.Type, E.Unit)
3315  : E.Decl;
3316  DBuilder.replaceTemporary(llvm::TempDIType(E.Decl), Ty);
3317  }
3318 
3319  for (auto p : ReplaceMap) {
3320  assert(p.second);
3321  auto *Ty = cast<llvm::DIType>(p.second);
3322  assert(Ty->isForwardDecl());
3323 
3324  auto it = TypeCache.find(p.first);
3325  assert(it != TypeCache.end());
3326  assert(it->second);
3327 
3328  DBuilder.replaceTemporary(llvm::TempDIType(Ty),
3329  cast<llvm::DIType>(it->second));
3330  }
3331 
3332  for (const auto &p : FwdDeclReplaceMap) {
3333  assert(p.second);
3334  llvm::TempMDNode FwdDecl(cast<llvm::MDNode>(p.second));
3335  llvm::Metadata *Repl;
3336 
3337  auto it = DeclCache.find(p.first);
3338  // If there has been no definition for the declaration, call RAUW
3339  // with ourselves, that will destroy the temporary MDNode and
3340  // replace it with a standard one, avoiding leaking memory.
3341  if (it == DeclCache.end())
3342  Repl = p.second;
3343  else
3344  Repl = it->second;
3345 
3346  DBuilder.replaceTemporary(std::move(FwdDecl), cast<llvm::MDNode>(Repl));
3347  }
3348 
3349  // We keep our own list of retained types, because we need to look
3350  // up the final type in the type cache.
3351  for (std::vector<void *>::const_iterator RI = RetainedTypes.begin(),
3352  RE = RetainedTypes.end(); RI != RE; ++RI)
3353  DBuilder.retainType(cast<llvm::DIType>(TypeCache[*RI]));
3354 
3355  DBuilder.finalize();
3356 }
3357 
3358 void CGDebugInfo::EmitExplicitCastType(QualType Ty) {
3359  if (CGM.getCodeGenOpts().getDebugInfo() < CodeGenOptions::LimitedDebugInfo)
3360  return;
3361 
3362  if (auto *DieTy = getOrCreateType(Ty, getOrCreateMainFile()))
3363  // Don't ignore in case of explicit cast where it is referenced indirectly.
3364  DBuilder.retainType(DieTy);
3365 }
Kind getKind() const
Definition: Type.h:2006
unsigned getNumElements() const
Definition: Type.h:2724
ArrayRef< ParmVarDecl * > parameters() const
Definition: Decl.h:1982
Defines the clang::ASTContext interface.
bool isObjCOneArgSelector() const
Qualifiers getLocalQualifiers() const
Retrieve the set of qualifiers local to this particular QualType instance, not including any qualifie...
Definition: Type.h:5035
ObjCInterfaceDecl * getDecl() const
getDecl - Get the declaration of this interface.
Definition: Type.h:4736
void print(raw_ostream &OS, const PrintingPolicy &Policy, bool SuppressNNS=false) const
Print the template name.
static bool hasDefaultSetterName(const ObjCPropertyDecl *PD, const ObjCMethodDecl *Setter)
StringRef getName() const
Definition: Decl.h:168
Smart pointer class that efficiently represents Objective-C method names.
std::string DwarfDebugFlags
CanQualType VoidPtrTy
Definition: ASTContext.h:831
void EmitLocation(raw_ostream &o, const SourceManager &SM, SourceLocation L, const FIDMap &FM, unsigned indent)
Definition: PlistSupport.h:90
APValue * evaluateValue() const
Attempt to evaluate the value of the initializer attached to this declaration, and produce notes expl...
Definition: Decl.cpp:2101
base_class_range bases()
Definition: DeclCXX.h:713
static unsigned getAccessFlag(AccessSpecifier Access, const RecordDecl *RD)
unsigned getColumn() const
Return the presumed column number of this location.
llvm::APSInt getAsIntegral() const
Retrieve the template argument as an integral value.
Definition: TemplateBase.h:284
bool isValid() const
bool isBitField() const
Determines whether this field is a bitfield.
Definition: Decl.h:2330
bool isByRef() const
Definition: Decl.h:3452
Defines the clang::FileManager interface and associated types.
llvm::LLVMContext & getLLVMContext()
IdentifierInfo * getIdentifier() const
Definition: Decl.h:163
std::string getClangFullVersion()
Retrieves a string representing the complete clang version, which includes the clang version number...
Definition: Version.cpp:118
QualType getQualifiedType(SplitQualType split) const
Un-split a SplitQualType.
Definition: ASTContext.h:1581
bool isFixed() const
Returns true if this is an Objective-C, C++11, or Microsoft-style enumeration with a fixed underlying...
Definition: Decl.h:3177
decl_range decls() const
Definition: DeclBase.h:1413
llvm::DIType * getOrCreateRecordType(QualType Ty, SourceLocation L)
Emit record type's standalone debug info.
bool isInvalid() const
Return true if this object is invalid or uninitialized.
TemplateDecl * getAsTemplateDecl() const
Retrieve the underlying template declaration that this template name refers to, if known...
Defines the SourceManager interface.
QuantityType getQuantity() const
getQuantity - Get the raw integer representation of this quantity.
Definition: CharUnits.h:163
bool isRecordType() const
Definition: Type.h:5289
QualType getUnderlyingType() const
Definition: Decl.h:2616
capture_const_iterator captures_begin() const
Definition: DeclCXX.h:1073
Defines the C++ template declaration subclasses.
method_iterator method_begin() const
Method begin iterator. Iterates in the order the methods were declared.
Definition: DeclCXX.h:761
static QualType UnwrapTypeForDebugInfo(QualType T, const ASTContext &C)
TypePropertyCache< Private > Cache
Definition: Type.cpp:3132
bool hasDefinition() const
Definition: DeclCXX.h:680
static bool hasDefaultGetterName(const ObjCPropertyDecl *PD, const ObjCMethodDecl *Getter)
QualType getLValueReferenceType(QualType T, bool SpelledAsLValue=true) const
Return the uniqued reference to the type for an lvalue reference to the specified type...
RefQualifierKind getRefQualifier() const
Retrieve the ref-qualifier associated with this method.
Definition: DeclCXX.h:1848
QualType getPointeeType() const
Definition: Type.h:2364
QualType getRecordType(const RecordDecl *Decl) const
encoding::Encoding Encoding
Definition: Format.cpp:1210
const Expr * getInit() const
Definition: Decl.h:1068
NamespaceDecl - Represent a C++ namespace.
Definition: Decl.h:400
bool isPrimaryBaseVirtual() const
Definition: RecordLayout.h:217
NamedDecl * getParam(unsigned Idx)
Definition: DeclTemplate.h:96
const PreprocessorOptions & getPreprocessorOpts() const
AccessSpecifier
A C++ access specifier (public, private, protected), plus the special value "none" which means differ...
Definition: Specifiers.h:83
Expr * getAsExpr() const
Retrieve the template argument as an expression.
Definition: TemplateBase.h:307
Describes the capture of a variable or of this, or of a C++1y init-capture.
Definition: LambdaCapture.h:26
llvm::IntegerType * Int8Ty
i8, i16, i32, and i64
Represents a C++ constructor within a class.
Definition: DeclCXX.h:2147
void * getAsOpaquePtr() const
Definition: Type.h:614
void removeObjCLifetime()
Definition: Type.h:293
bool capturesCXXThis() const
Definition: Decl.h:3575
Represents an empty template argument, e.g., one that has not been deduced.
Definition: TemplateBase.h:45
ExtProtoInfo - Extra information about a function prototype.
Definition: Type.h:3042
AccessSpecifier getAccess() const
Definition: DeclBase.h:416
field_iterator field_begin() const
Definition: Decl.cpp:3629
const FunctionProtoType * getFunctionType() const
getFunctionType - Return the underlying function type for this block.
Definition: Expr.cpp:1987
uint64_t getTypeSize(QualType T) const
Return the size of the specified (complete) type T, in bits.
Definition: ASTContext.h:1701
QualType getThisType(ASTContext &C) const
Returns the type of the this pointer.
Definition: DeclCXX.cpp:1592
llvm::Constant * GetAddrOfGlobalVar(const VarDecl *D, llvm::Type *Ty=nullptr)
NamespaceDecl * getCanonicalDecl() override
Retrieves the canonical declaration of this namespace.
Definition: Decl.h:496
std::string SplitDwarfFile
Stores a list of template parameters for a TemplateDecl and its derived classes.
Definition: DeclTemplate.h:46
bool isMemberDataPointerType() const
Definition: Type.h:5265
capture_range captures()
Definition: Decl.h:3563
Describes how types, statements, expressions, and declarations should be printed. ...
Definition: PrettyPrinter.h:35
ParmVarDecl - Represents a parameter to a function.
Definition: Decl.h:1334
unsigned getNumArgs() const
Retrieve the number of template arguments.
Definition: Type.h:4038
bool isUnionType() const
Definition: Type.cpp:390
static llvm::dwarf::Tag getTagForRecord(const RecordDecl *RD)
unsigned getNumParams() const
Definition: Type.h:3133
Represents a class template specialization, which refers to a class template with a given set of temp...
QualType apply(const ASTContext &Context, QualType QT) const
Apply the collected qualifiers to the given type.
Definition: Type.cpp:3029
bool hasAttr() const
Definition: DeclBase.h:487
void removeRestrict()
Definition: Type.h:244
const TemplateArgumentList * getTemplateSpecializationArgs() const
Retrieve the template arguments used to produce this function template specialization from the primar...
Definition: Decl.cpp:3073
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:89
static bool isFunctionLocalClass(const CXXRecordDecl *RD)
QualType getReturnType() const
Definition: Decl.h:1997
bool isCompleteDefinition() const
Definition: Decl.h:2838
void removeConst()
Definition: Type.h:230
bool isClass() const
Definition: Decl.h:2905
Don't generate debug info.
bool isPure() const
Definition: Decl.h:1789
QualType getBlockDescriptorType() const
CXXMethodDecl * getCanonicalDecl() override
Retrieves the "canonical" declaration of the given declaration.
Definition: DeclCXX.h:1785
const CXXRecordDecl * getPointeeCXXRecordDecl() const
Definition: Type.cpp:1490
unsigned size() const
Retrieve the number of template arguments in this template argument list.
Definition: DeclTemplate.h:212
unsigned shadow_size() const
Return the number of shadowed declarations associated with this using declaration.
Definition: DeclCXX.h:2978
void completeClassData(const RecordDecl *RD)
Keeps track of the various options that can be enabled, which controls the dialect of C or C++ that i...
Definition: LangOptions.h:48
QualType getTypeDeclType(const TypeDecl *Decl, const TypeDecl *PrevDecl=nullptr) const
Return the unique reference to the type for the specified type declaration.
Definition: ASTContext.h:1114
const Decl * getDecl() const
Definition: GlobalDecl.h:60
virtual void getNameForDiagnostic(raw_ostream &OS, const PrintingPolicy &Policy, bool Qualified) const
Definition: Decl.cpp:1445
Provides information about a function template specialization, which is a FunctionDecl that has been ...
Definition: DeclTemplate.h:371
const Capture & getCapture(const VarDecl *var) const
Definition: CGBlocks.h:233
Represents a C++ using-declaration.
Definition: DeclCXX.h:2871
const TemplateArgumentList * TemplateArguments
The template arguments used to produce the function template specialization from the function templat...
Definition: DeclTemplate.h:404
static SmallString< 64 > constructSetterName(StringRef Name)
Return the default setter name for the given identifier.
An lvalue ref-qualifier was provided (&).
Definition: Type.h:1204
bool isImplicit() const
Definition: DeclBase.h:503
uint32_t Offset
Definition: CacheTokens.cpp:43
QualType getBaseType() const
Definition: Type.h:4569
TemplateName getTemplateName() const
Retrieve the name of the template that we are specializing.
Definition: Type.h:4030
NamedDecl * getAliasedNamespace() const
Retrieve the namespace that this alias refers to, which may either be a NamespaceDecl or a NamespaceA...
Definition: DeclCXX.h:2756
QualType getReturnType() const
Definition: Type.h:2952
const CXXRecordDecl * getParent() const
Definition: DeclCXX.h:1817
shadow_iterator shadow_begin() const
Definition: DeclCXX.h:2971
field_range fields() const
Definition: Decl.h:3349
RecordDecl * getDecl() const
Definition: Type.h:3527
static bool hasCXXMangling(const TagDecl *TD, llvm::DICompileUnit *TheCU)
std::string getNameAsString() const
Definition: Decl.h:183
bool isVariadic() const
Whether this function is variadic.
Definition: Decl.cpp:2362
static Qualifiers removeCommonQualifiers(Qualifiers &L, Qualifiers &R)
Returns the common set of qualifiers while removing them from the given sets.
Definition: Type.h:166
llvm::DIType * getOrCreateInterfaceType(QualType Ty, SourceLocation Loc)
Emit an Objective-C interface type standalone debug info.
unsigned Align
Definition: ASTContext.h:80
const ASTRecordLayout & getASTRecordLayout(const RecordDecl *D) const
Get or compute information about the layout of the specified record (struct/union/class) D...
uint64_t getFieldOffset(unsigned FieldNo) const
Definition: RecordLayout.h:181
TypeClass getTypeClass() const
Definition: Type.h:1486
VarDecl * getCapturedVar() const
Retrieve the declaration of the local variable being captured.
Definition: LambdaCapture.h:93
bool isIncompleteType(NamedDecl **Def=nullptr) const
Def If non-NULL, and the type refers to some kind of declaration that can be completed (such as a C s...
Definition: Type.cpp:1869
bool hasConst() const
Definition: Type.h:226
DeclContext * getLexicalDeclContext()
Definition: DeclBase.h:697
unsigned getLine() const
Return the presumed line number of this location.
Represents an ObjC class declaration.
Definition: DeclObjC.h:851
uint64_t getMethodVTableIndex(GlobalDecl GD)
Locate a virtual function in the vtable.
bool empty() const
Definition: Type.h:356
QualType getAliasedType() const
Definition: Type.h:4019
void removeVolatile()
Definition: Type.h:237
CharUnits getVirtualBaseOffsetOffset(const CXXRecordDecl *RD, const CXXRecordDecl *VBase)
QualType getType() const
Definition: Decl.h:538
bool isInvalid() const
virtual Decl * getCanonicalDecl()
Retrieves the "canonical" declaration of the given declaration.
Definition: DeclBase.h:733
bool NeedsCopyDispose
True if the block needs a custom copy or dispose function.
Definition: CGBlocks.h:191
bool hasPrototype() const
Whether this function has a prototype, either because one was explicitly written or because it was "i...
Definition: Decl.h:1823
bool isPositive() const
isPositive - Test whether the quantity is greater than zero.
Definition: CharUnits.h:122
EnumDecl * getDecl() const
Definition: Type.h:3550
bool isStatic() const
Definition: DeclCXX.cpp:1402
bool isUnion() const
Definition: Decl.h:2906
QualType getValueType() const
Definition: Type.h:4965
const FileEntry * getFileEntryForID(FileID FID) const
Returns the FileEntry record for the provided FileID.
QualType getParamType(unsigned i) const
Definition: Type.h:3134
CGBlockInfo - Information to generate a block literal.
Definition: CGBlocks.h:144
const TargetInfo & getTarget() const
ASTContext * Context
const SmallVectorImpl< AnnotatedLine * >::const_iterator End
ArrayRef< TemplateArgument > asArray() const
Produce this as an array ref.
Definition: DeclTemplate.h:206
ID
Defines the set of possible language-specific address spaces.
Definition: AddressSpaces.h:27
SourceManager & SM
bool hasLocalQualifiers() const
Determine whether this particular QualType instance has any qualifiers, without looking through any t...
Definition: Type.h:670
bool hasVolatile() const
Definition: Type.h:233
bool isMicrosoft() const
Is this ABI an MSVC-compatible ABI?
Definition: TargetCXXABI.h:133
const Type * getTypeForDecl() const
Definition: Decl.h:2557
QualType getPointeeType() const
Definition: Type.h:2246
QualType getBlockDescriptorExtendedType() const
StringRef getName() const
Return the actual identifier string.
bool isInstance() const
Definition: DeclCXX.h:1744
CGCXXABI & getCXXABI() const
VarDecl * getVariable() const
The variable being captured.
Definition: Decl.h:3448
bool isStruct() const
Definition: Decl.h:2903
bool isVirtual() const
Definition: DeclCXX.h:1761
bool isTypeAlias() const
Determine if this template specialization type is for a type alias template that has been substituted...
Definition: Type.h:4015
Defines version macros and version-related utility functions for Clang.
ArgKind getKind() const
Return the kind of stored template argument.
Definition: TemplateBase.h:218
ExtProtoInfo getExtProtoInfo() const
Definition: Type.h:3142
DeclContext * getDeclContext()
Definition: DeclBase.h:381
CharUnits getBaseClassOffset(const CXXRecordDecl *Base) const
getBaseClassOffset - Get the offset, in chars, for the given base class.
Definition: RecordLayout.h:224
ASTContext & getContext() const
SourceLocation getLocation() const
Retrieve the source location of the capture.
static CharUnits fromQuantity(QuantityType Quantity)
fromQuantity - Construct a CharUnits quantity from a raw integer type.
Definition: CharUnits.h:63
MicrosoftVTableContext & getMicrosoftVTableContext()
ImplicitParamDecl * getSelfDecl() const
Definition: DeclObjC.h:411
QualType getDesugaredType(const ASTContext &Context) const
Definition: Type.h:864
CharUnits toCharUnitsFromBits(int64_t BitSize) const
Convert a size in bits to a size in characters.
void print(raw_ostream &OS, const PrintingPolicy &Policy, const Twine &PlaceHolder=Twine()) const
Definition: Type.h:907
bool isInstanceMethod() const
Definition: DeclObjC.h:419
clang::ObjCRuntime ObjCRuntime
Definition: LangOptions.h:85
virtual llvm::Constant * EmitMemberFunctionPointer(const CXXMethodDecl *MD)
Create a member pointer for the given method.
Definition: CGCXXABI.cpp:133
bool isObjCQualifiedIdType() const
Definition: Type.h:4859
QualType getObjCIdType() const
Represents the Objective-CC id type.
Definition: ASTContext.h:1510
const TemplateArgument * data() const
Retrieve a pointer to the template argument list.
Definition: DeclTemplate.h:215
Represents an unpacked "presumed" location which can be presented to the user.
bool isExternallyVisible() const
Definition: Decl.h:279
DeclarationName getDeclName() const
Definition: Decl.h:189
ClassTemplateDecl * getSpecializedTemplate() const
Retrieve the template that this specialization specializes.
QualType getElementType() const
Definition: Type.h:2723
bool isGLValue() const
Definition: Expr.h:253
Represents a C++ conversion function within a class.
Definition: DeclCXX.h:2405
bool isComplexIntegerType() const
Definition: Type.cpp:402
RecordDecl * getDefinition() const
Definition: Decl.h:3339
FunctionTemplateDecl * getTemplate() const
Retrieve the template from which this function was specialized.
Definition: DeclTemplate.h:414
llvm::IRBuilder< PreserveNames, llvm::ConstantFolder, CGBuilderInserterTy > CGBuilderTy
Definition: CGBuilder.h:49
VarDecl * getCanonicalDecl() override
Retrieves the "canonical" declaration of the given declaration.
Definition: Decl.cpp:1893
const clang::PrintingPolicy & getPrintingPolicy() const
Definition: ASTContext.h:486
uint64_t getFieldOffset(const ValueDecl *FD) const
Get the offset of a FieldDecl or IndirectFieldDecl, in bits.
unsigned getVBTableIndex(const CXXRecordDecl *Derived, const CXXRecordDecl *VBase)
Returns the index of VBase in the vbtable of Derived. VBase must be a morally virtual base of Derived...
redecl_range redecls() const
Returns an iterator range for all the redeclarations of the same decl. It will iterate at least once ...
Definition: Redeclarable.h:228
unsigned getTypeAlign(QualType T) const
Return the ABI-specified alignment of a (complete) type T, in bits.
Definition: ASTContext.h:1722
TypeInfo getTypeInfo(const Type *T) const
Get the size and alignment of the specified complete type in bits.
bool isNonFragile() const
Does this runtime follow the set of implied behaviors for a "non-fragile" ABI?
Definition: ObjCRuntime.h:76
virtual void mangleCXXRTTIName(QualType T, raw_ostream &)=0
const char * getFilename() const
Return the presumed filename of this location.
llvm::Constant * EmitConstantExpr(const Expr *E, QualType DestType, CodeGenFunction *CGF=nullptr)
bool isInterface() const
Definition: Decl.h:2904
Encodes a location in the source. The SourceManager can decode this to get at the full include stack...
enumerator_range enumerators() const
Definition: Decl.h:3087
const Type * getTypePtr() const
Definition: Type.h:5016
TemplateName getAsTemplate() const
Retrieve the template name for a template name argument.
Definition: TemplateBase.h:264
unsigned getBitWidthValue(const ASTContext &Ctx) const
Definition: Decl.cpp:3344
AnnotatedLine & Line
const CXXRecordDecl * getPrimaryBase() const
getPrimaryBase - Get the primary base for this record.
Definition: RecordLayout.h:209
llvm::StructType * StructureType
Definition: CGBlocks.h:209
void completeRequiredType(const RecordDecl *RD)
bool isValid() const
Return true if this is a valid SourceLocation object.
TagDecl - Represents the declaration of a struct/union/class/enum.
Definition: Decl.h:2694
StringRef getNameForSlot(unsigned argIndex) const
Retrieve the name at a given position in the selector.
static QualType getUnderlyingType(const SubRegion *R)
Cached information about one file (either on disk or in the virtual file system). ...
Definition: FileManager.h:53
APFloat & getFloat()
Definition: APValue.h:208
void printName(raw_ostream &os) const
Definition: Decl.h:185
Represents a static or instance method of a struct/union/class.
Definition: DeclCXX.h:1717
Module * getImportedModule() const
Retrieve the module that was imported by the import declaration.
Definition: Decl.h:3746
CanQualType VoidTy
Definition: ASTContext.h:817
Capture(VarDecl *variable, bool byRef, bool nested, Expr *copy)
Definition: Decl.h:3442
const CodeGenOptions & getCodeGenOpts() const
const LangOptions & getLangOpts() const
Represents one property declaration in an Objective-C interface.
Definition: DeclObjC.h:2424
std::string getAsString() const
Derive the full selector name (e.g. "foo:bar:") and return it as an std::string.
TypedefNameDecl * getDecl() const
Definition: Type.h:3348
const T * castAs() const
Definition: Type.h:5586
MangleContext & getMangleContext()
Gets the mangle context.
Definition: CGCXXABI.h:85
FileID getMainFileID() const
Returns the FileID of the main source file.
bool operator<(DeclarationName LHS, DeclarationName RHS)
method_iterator method_end() const
Method past-the-end iterator.
Definition: DeclCXX.h:765
ItaniumVTableContext & getItaniumVTableContext()
unsigned CXXThisIndex
The field index of 'this' within the block, if there is one.
Definition: CGBlocks.h:150
An rvalue ref-qualifier was provided (&&).
Definition: Type.h:1206
void removeObjCGCAttr()
Definition: Type.h:270
virtual llvm::Constant * EmitNullMemberPointer(const MemberPointerType *MPT)
Create a null member pointer of the given type.
Definition: CGCXXABI.cpp:129
static bool hasExplicitMemberDefinition(CXXRecordDecl::method_iterator I, CXXRecordDecl::method_iterator End)
static std::string getFunctionName(const Decl *D)
bool isDynamicClass() const
Definition: DeclCXX.h:693
ValueDecl * getAsDecl() const
Retrieve the declaration for a declaration non-type template argument.
Definition: TemplateBase.h:247
Describes a module import declaration, which makes the contents of the named module visible in the cu...
Definition: Decl.h:3704
SourceLocation getExprLoc() const LLVM_READONLY
Definition: Expr.cpp:193
QualType getPointeeType() const
Definition: Type.h:2139
ObjCIvarDecl * getNextIvar()
Definition: DeclObjC.h:1645
QualType getType() const
Definition: Expr.h:125
bool isAnonymousStructOrUnion() const
Definition: Decl.h:3294
Represents a template argument.
Definition: TemplateBase.h:39
QualType getAsType() const
Retrieve the type for a type template argument.
Definition: TemplateBase.h:240
Selector getObjCSelector() const
NamespaceDecl * getNominatedNamespace()
Returns the namespace nominated by this using-directive.
Definition: DeclCXX.cpp:1994
TemplatedKind getTemplatedKind() const
What kind of templated function this is.
Definition: Decl.cpp:2932
A qualifier set is used to build a set of qualifiers.
Definition: Type.h:4982
llvm::Constant * GetAddrOfFunction(GlobalDecl GD, llvm::Type *Ty=0, bool ForVTable=false, bool DontDefer=false)
prop_range properties() const
Definition: DeclObjC.h:714
const internal::VariadicAllOfMatcher< Type > type
Matches Types in the clang AST.
Definition: ASTMatchers.h:1639
static __inline__ uint32_t volatile uint32_t * p
Definition: arm_acle.h:75
ObjCInterfaceDecl * getDefinition()
Retrieve the definition of this class, or NULL if this class has been forward-declared (with @class) ...
Definition: DeclObjC.h:1219
QualType getEnumType(const EnumDecl *Decl) const
QualType getPointerType(QualType T) const
Return the uniqued reference to the type for a pointer to the specified type.
const Type * strip(QualType type)
Definition: Type.h:4989
Decl * getNonClosureContext()
Definition: DeclBase.cpp:782
CGDebugInfo(CodeGenModule &CGM)
Definition: CGDebugInfo.cpp:46
std::string DebugCompilationDir
The string to embed in debug information as the current working directory.
Selector getSelector() const
Definition: DeclObjC.h:328
TemplateSpecializationKind
Describes the kind of template specialization that a particular template specialization declaration r...
Definition: Specifiers.h:131
bool isFloat() const
Definition: APValue.h:183
bool isLambda() const
Determine whether this class describes a lambda function object.
Definition: DeclCXX.h:1022
QualType getPointeeType() const
Definition: Type.h:4794
bool isCompleteDefinitionRequired() const
Return true if this complete decl is required to be complete for some existing use.
Definition: Decl.h:2844
const TemplateArgument * getArgs() const
Retrieve the template arguments.
Definition: Type.h:4033
SourceLocation getCaretLocation() const
Definition: Decl.h:3497
const T * getAs() const
Definition: Type.h:5555
unsigned getTypeQuals() const
Definition: Type.h:3240
CanQualType UnsignedLongTy
Definition: ASTContext.h:826
QualType getIntegralType() const
Retrieve the type of the integral value.
Definition: TemplateBase.h:296
void completeType(const EnumDecl *ED)
QualType getIntegerType() const
Definition: Decl.h:3115
virtual llvm::Constant * EmitMemberDataPointer(const MemberPointerType *MPT, CharUnits offset)
Create a member pointer for the given field.
Definition: CGCXXABI.cpp:138
StringRef getMangledName(GlobalDecl GD)
The template argument is a type.
Definition: TemplateBase.h:47
ObjCImplementationDecl * getImplementation() const
Definition: DeclObjC.cpp:1393
bool isStaticDataMember() const
Determines whether this is a static data member.
Definition: Decl.h:982
bool isObjCZeroArgSelector() const
QualType getPointeeType() const
Definition: Type.h:2286
SourceManager & getSourceManager()
Definition: ASTContext.h:494
uint64_t getPointerWidth(unsigned AddrSpace) const
Return the width of pointers on this target, for the specified address space.
std::string getQualifiedNameAsString() const
Definition: Decl.cpp:1360
A template argument list.
Definition: DeclTemplate.h:150
const TemplateArgumentList & getTemplateArgs() const
Retrieve the template arguments of the class template specialization.
const Type * getClass() const
Definition: Type.h:2378
QualType getNullPtrType() const
Retrieve the type for null non-type template argument.
Definition: TemplateBase.h:258
ArrayRef< TemplateArgument > getPackAsArray() const
Return the array of arguments in this template argument pack.
Definition: TemplateBase.h:343
FunctionTemplateSpecializationInfo * getTemplateSpecializationInfo() const
If this function is actually a function template specialization, retrieve information about this func...
Definition: Decl.h:2131
Represents a C++ struct/union/class.
Definition: DeclCXX.h:285
BoundNodesTreeBuilder *const Builder
TargetCXXABI getCXXABI() const
Get the C++ ABI currently in use.
bool isItaniumFamily() const
Does this ABI generally fall into the Itanium family of ABIs?
Definition: TargetCXXABI.h:116
const BlockDecl * getBlockDecl() const
Definition: CGBlocks.h:243
TemplateParameterList * getTemplateParameters() const
Get the list of template parameters.
Definition: DeclTemplate.h:335
QualType getParamTypeForDecl() const
Definition: TemplateBase.h:252
capture_const_iterator captures_end() const
Definition: DeclCXX.h:1076
ObjCInterfaceDecl * getSuperClass() const
Definition: DeclObjC.cpp:271
void setLocation(SourceLocation Loc)
uint64_t Width
Definition: ASTContext.h:79
TagDecl * getDecl() const
Definition: Type.cpp:2858
bool isIncompleteArrayType() const
Definition: Type.h:5277
bool isInt() const
Definition: APValue.h:182
CanQualType IntTy
Definition: ASTContext.h:825
bool isRecord() const
Definition: DeclBase.h:1247
unsigned getTargetAddressSpace(QualType T) const
Definition: ASTContext.h:2089
Represents a type template specialization; the template must be a class template, a type alias templa...
Definition: Type.h:3941
bool hasRestrict() const
Definition: Type.h:240
QualType getElementType() const
Definition: Type.h:2434
bool capturesThis() const
Determine whether this capture handles the C++ this pointer.
Definition: LambdaCapture.h:71
static void PrintTemplateArgumentList(raw_ostream &OS, const TemplateArgument *Args, unsigned NumArgs, const PrintingPolicy &Policy, bool SkipBrackets=false)
Print a template argument list, including the '<' and '>' enclosing the template arguments...
int64_t toBits(CharUnits CharSize) const
Convert a size in characters to a size in bits.
const BlockExpr * getBlockExpr() const
Definition: CGBlocks.h:244
SourceLocation getLocation() const
Definition: DeclBase.h:372
FunctionDecl * getCanonicalDecl() override
Retrieves the "canonical" declaration of the given declaration.
Definition: Decl.cpp:2590
ObjCIvarDecl * all_declared_ivar_begin()
Definition: DeclObjC.cpp:1433
static SmallString< 256 > getUniqueTagTypeName(const TagType *Ty, CodeGenModule &CGM, llvm::DICompileUnit *TheCU)
StringRef getName(const PrintingPolicy &Policy) const
Definition: Type.cpp:2474
SourceLocation getExpansionLoc(SourceLocation Loc) const
Given a SourceLocation object Loc, return the expansion location referenced by the ID...
EnumDecl * getDefinition() const
Definition: Decl.h:3060
Represents a C++ namespace alias.
Definition: DeclCXX.h:2662
APSInt & getInt()
Definition: APValue.h:200
Represents C++ using-directive.
Definition: DeclCXX.h:2559
bool isNull() const
isNull - Return true if this QualType doesn't point to a type yet.
Definition: Type.h:633
static bool shouldOmitDefinition(CodeGenOptions::DebugInfoKind DebugKind, const RecordDecl *RD, const LangOptions &LangOpts)
CharUnits RoundUpToAlignment(const CharUnits &Align) const
Definition: CharUnits.h:168
void removeAddressSpace()
Definition: Type.h:319
This class handles loading and caching of source files into memory.
Holds everything needed to generate debug info for an imported module or precompiled header file...
Represents a shadow declaration introduced into a scope by a (resolved) using declaration.
Definition: DeclCXX.h:2779
unsigned Column
Definition: Format.cpp:1202
bool capturesVariable() const
Determine whether this capture handles a variable.
Definition: LambdaCapture.h:77
bool isPointerType() const
Definition: Type.h:5232
PresumedLoc getPresumedLoc(SourceLocation Loc, bool UseLineDirectives=true) const
Returns the "presumed" location of a SourceLocation specifies.