1 //===- DebugInfoMetadata.cpp - Implement debug info metadata --------------===//
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 file implements the debug info Metadata classes.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "llvm/IR/DebugInfoMetadata.h"
15 #include "LLVMContextImpl.h"
16 #include "MetadataImpl.h"
17 #include "llvm/ADT/SmallSet.h"
18 #include "llvm/ADT/StringSwitch.h"
19 #include "llvm/IR/DIBuilder.h"
20 #include "llvm/IR/Function.h"
21 #include "llvm/IR/Instructions.h"
22 
23 using namespace llvm;
24 
25 DILocation::DILocation(LLVMContext &C, StorageType Storage, unsigned Line,
26                        unsigned Column, ArrayRef<Metadata *> MDs,
27                        bool ImplicitCode)
28     : MDNode(C, DILocationKind, Storage, MDs) {
29   assert((MDs.size() == 1 || MDs.size() == 2) &&
30          "Expected a scope and optional inlined-at");
31 
32   // Set line and column.
33   assert(Column < (1u << 16) && "Expected 16-bit column");
34 
35   SubclassData32 = Line;
36   SubclassData16 = Column;
37 
38   setImplicitCode(ImplicitCode);
39 }
40 
41 static void adjustColumn(unsigned &Column) {
42   // Set to unknown on overflow.  We only have 16 bits to play with here.
43   if (Column >= (1u << 16))
44     Column = 0;
45 }
46 
47 DILocation *DILocation::getImpl(LLVMContext &Context, unsigned Line,
48                                 unsigned Column, Metadata *Scope,
49                                 Metadata *InlinedAt, bool ImplicitCode,
50                                 StorageType Storage, bool ShouldCreate) {
51   // Fixup column.
52   adjustColumn(Column);
53 
54   if (Storage == Uniqued) {
55     if (auto *N = getUniqued(Context.pImpl->DILocations,
56                              DILocationInfo::KeyTy(Line, Column, Scope,
57                                                    InlinedAt, ImplicitCode)))
58       return N;
59     if (!ShouldCreate)
60       return nullptr;
61   } else {
62     assert(ShouldCreate && "Expected non-uniqued nodes to always be created");
63   }
64 
65   SmallVector<Metadata *, 2> Ops;
66   Ops.push_back(Scope);
67   if (InlinedAt)
68     Ops.push_back(InlinedAt);
69   return storeImpl(new (Ops.size()) DILocation(Context, Storage, Line, Column,
70                                                Ops, ImplicitCode),
71                    Storage, Context.pImpl->DILocations);
72 }
73 
74 const DILocation *DILocation::getMergedLocation(const DILocation *LocA,
75                                                 const DILocation *LocB) {
76   if (!LocA || !LocB)
77     return nullptr;
78 
79   if (LocA == LocB)
80     return LocA;
81 
82   SmallPtrSet<DILocation *, 5> InlinedLocationsA;
83   for (DILocation *L = LocA->getInlinedAt(); L; L = L->getInlinedAt())
84     InlinedLocationsA.insert(L);
85   SmallSet<std::pair<DIScope *, DILocation *>, 5> Locations;
86   DIScope *S = LocA->getScope();
87   DILocation *L = LocA->getInlinedAt();
88   while (S) {
89     Locations.insert(std::make_pair(S, L));
90     S = S->getScope().resolve();
91     if (!S && L) {
92       S = L->getScope();
93       L = L->getInlinedAt();
94     }
95   }
96   const DILocation *Result = LocB;
97   S = LocB->getScope();
98   L = LocB->getInlinedAt();
99   while (S) {
100     if (Locations.count(std::make_pair(S, L)))
101       break;
102     S = S->getScope().resolve();
103     if (!S && L) {
104       S = L->getScope();
105       L = L->getInlinedAt();
106     }
107   }
108 
109   // If the two locations are irreconsilable, just pick one. This is misleading,
110   // but on the other hand, it's a "line 0" location.
111   if (!S || !isa<DILocalScope>(S))
112     S = LocA->getScope();
113   return DILocation::get(Result->getContext(), 0, 0, S, L);
114 }
115 
116 DINode::DIFlags DINode::getFlag(StringRef Flag) {
117   return StringSwitch<DIFlags>(Flag)
118 #define HANDLE_DI_FLAG(ID, NAME) .Case("DIFlag" #NAME, Flag##NAME)
119 #include "llvm/IR/DebugInfoFlags.def"
120       .Default(DINode::FlagZero);
121 }
122 
123 StringRef DINode::getFlagString(DIFlags Flag) {
124   switch (Flag) {
125 #define HANDLE_DI_FLAG(ID, NAME)                                               \
126   case Flag##NAME:                                                             \
127     return "DIFlag" #NAME;
128 #include "llvm/IR/DebugInfoFlags.def"
129   }
130   return "";
131 }
132 
133 DINode::DIFlags DINode::splitFlags(DIFlags Flags,
134                                    SmallVectorImpl<DIFlags> &SplitFlags) {
135   // Flags that are packed together need to be specially handled, so
136   // that, for example, we emit "DIFlagPublic" and not
137   // "DIFlagPrivate | DIFlagProtected".
138   if (DIFlags A = Flags & FlagAccessibility) {
139     if (A == FlagPrivate)
140       SplitFlags.push_back(FlagPrivate);
141     else if (A == FlagProtected)
142       SplitFlags.push_back(FlagProtected);
143     else
144       SplitFlags.push_back(FlagPublic);
145     Flags &= ~A;
146   }
147   if (DIFlags R = Flags & FlagPtrToMemberRep) {
148     if (R == FlagSingleInheritance)
149       SplitFlags.push_back(FlagSingleInheritance);
150     else if (R == FlagMultipleInheritance)
151       SplitFlags.push_back(FlagMultipleInheritance);
152     else
153       SplitFlags.push_back(FlagVirtualInheritance);
154     Flags &= ~R;
155   }
156   if ((Flags & FlagIndirectVirtualBase) == FlagIndirectVirtualBase) {
157     Flags &= ~FlagIndirectVirtualBase;
158     SplitFlags.push_back(FlagIndirectVirtualBase);
159   }
160 
161 #define HANDLE_DI_FLAG(ID, NAME)                                               \
162   if (DIFlags Bit = Flags & Flag##NAME) {                                      \
163     SplitFlags.push_back(Bit);                                                 \
164     Flags &= ~Bit;                                                             \
165   }
166 #include "llvm/IR/DebugInfoFlags.def"
167   return Flags;
168 }
169 
170 DIScopeRef DIScope::getScope() const {
171   if (auto *T = dyn_cast<DIType>(this))
172     return T->getScope();
173 
174   if (auto *SP = dyn_cast<DISubprogram>(this))
175     return SP->getScope();
176 
177   if (auto *LB = dyn_cast<DILexicalBlockBase>(this))
178     return LB->getScope();
179 
180   if (auto *NS = dyn_cast<DINamespace>(this))
181     return NS->getScope();
182 
183   if (auto *M = dyn_cast<DIModule>(this))
184     return M->getScope();
185 
186   assert((isa<DIFile>(this) || isa<DICompileUnit>(this)) &&
187          "Unhandled type of scope.");
188   return nullptr;
189 }
190 
191 StringRef DIScope::getName() const {
192   if (auto *T = dyn_cast<DIType>(this))
193     return T->getName();
194   if (auto *SP = dyn_cast<DISubprogram>(this))
195     return SP->getName();
196   if (auto *NS = dyn_cast<DINamespace>(this))
197     return NS->getName();
198   if (auto *M = dyn_cast<DIModule>(this))
199     return M->getName();
200   assert((isa<DILexicalBlockBase>(this) || isa<DIFile>(this) ||
201           isa<DICompileUnit>(this)) &&
202          "Unhandled type of scope.");
203   return "";
204 }
205 
206 #ifndef NDEBUG
207 static bool isCanonical(const MDString *S) {
208   return !S || !S->getString().empty();
209 }
210 #endif
211 
212 GenericDINode *GenericDINode::getImpl(LLVMContext &Context, unsigned Tag,
213                                       MDString *Header,
214                                       ArrayRef<Metadata *> DwarfOps,
215                                       StorageType Storage, bool ShouldCreate) {
216   unsigned Hash = 0;
217   if (Storage == Uniqued) {
218     GenericDINodeInfo::KeyTy Key(Tag, Header, DwarfOps);
219     if (auto *N = getUniqued(Context.pImpl->GenericDINodes, Key))
220       return N;
221     if (!ShouldCreate)
222       return nullptr;
223     Hash = Key.getHash();
224   } else {
225     assert(ShouldCreate && "Expected non-uniqued nodes to always be created");
226   }
227 
228   // Use a nullptr for empty headers.
229   assert(isCanonical(Header) && "Expected canonical MDString");
230   Metadata *PreOps[] = {Header};
231   return storeImpl(new (DwarfOps.size() + 1) GenericDINode(
232                        Context, Storage, Hash, Tag, PreOps, DwarfOps),
233                    Storage, Context.pImpl->GenericDINodes);
234 }
235 
236 void GenericDINode::recalculateHash() {
237   setHash(GenericDINodeInfo::KeyTy::calculateHash(this));
238 }
239 
240 #define UNWRAP_ARGS_IMPL(...) __VA_ARGS__
241 #define UNWRAP_ARGS(ARGS) UNWRAP_ARGS_IMPL ARGS
242 #define DEFINE_GETIMPL_LOOKUP(CLASS, ARGS)                                     \
243   do {                                                                         \
244     if (Storage == Uniqued) {                                                  \
245       if (auto *N = getUniqued(Context.pImpl->CLASS##s,                        \
246                                CLASS##Info::KeyTy(UNWRAP_ARGS(ARGS))))         \
247         return N;                                                              \
248       if (!ShouldCreate)                                                       \
249         return nullptr;                                                        \
250     } else {                                                                   \
251       assert(ShouldCreate &&                                                   \
252              "Expected non-uniqued nodes to always be created");               \
253     }                                                                          \
254   } while (false)
255 #define DEFINE_GETIMPL_STORE(CLASS, ARGS, OPS)                                 \
256   return storeImpl(new (array_lengthof(OPS))                                   \
257                        CLASS(Context, Storage, UNWRAP_ARGS(ARGS), OPS),        \
258                    Storage, Context.pImpl->CLASS##s)
259 #define DEFINE_GETIMPL_STORE_NO_OPS(CLASS, ARGS)                               \
260   return storeImpl(new (0u) CLASS(Context, Storage, UNWRAP_ARGS(ARGS)),        \
261                    Storage, Context.pImpl->CLASS##s)
262 #define DEFINE_GETIMPL_STORE_NO_CONSTRUCTOR_ARGS(CLASS, OPS)                   \
263   return storeImpl(new (array_lengthof(OPS)) CLASS(Context, Storage, OPS),     \
264                    Storage, Context.pImpl->CLASS##s)
265 #define DEFINE_GETIMPL_STORE_N(CLASS, ARGS, OPS, NUM_OPS)                      \
266   return storeImpl(new (NUM_OPS)                                               \
267                        CLASS(Context, Storage, UNWRAP_ARGS(ARGS), OPS),        \
268                    Storage, Context.pImpl->CLASS##s)
269 
270 DISubrange *DISubrange::getImpl(LLVMContext &Context, int64_t Count, int64_t Lo,
271                                 StorageType Storage, bool ShouldCreate) {
272   auto *CountNode = ConstantAsMetadata::get(
273       ConstantInt::getSigned(Type::getInt64Ty(Context), Count));
274   return getImpl(Context, CountNode, Lo, Storage, ShouldCreate);
275 }
276 
277 DISubrange *DISubrange::getImpl(LLVMContext &Context, Metadata *CountNode,
278                                 int64_t Lo, StorageType Storage,
279                                 bool ShouldCreate) {
280   DEFINE_GETIMPL_LOOKUP(DISubrange, (CountNode, Lo));
281   Metadata *Ops[] = { CountNode };
282   DEFINE_GETIMPL_STORE(DISubrange, (CountNode, Lo), Ops);
283 }
284 
285 DIEnumerator *DIEnumerator::getImpl(LLVMContext &Context, int64_t Value,
286                                     bool IsUnsigned, MDString *Name,
287                                     StorageType Storage, bool ShouldCreate) {
288   assert(isCanonical(Name) && "Expected canonical MDString");
289   DEFINE_GETIMPL_LOOKUP(DIEnumerator, (Value, IsUnsigned, Name));
290   Metadata *Ops[] = {Name};
291   DEFINE_GETIMPL_STORE(DIEnumerator, (Value, IsUnsigned), Ops);
292 }
293 
294 DIBasicType *DIBasicType::getImpl(LLVMContext &Context, unsigned Tag,
295                                   MDString *Name, uint64_t SizeInBits,
296                                   uint32_t AlignInBits, unsigned Encoding,
297                                   DIFlags Flags, StorageType Storage,
298                                   bool ShouldCreate) {
299   assert(isCanonical(Name) && "Expected canonical MDString");
300   DEFINE_GETIMPL_LOOKUP(DIBasicType,
301                         (Tag, Name, SizeInBits, AlignInBits, Encoding, Flags));
302   Metadata *Ops[] = {nullptr, nullptr, Name};
303   DEFINE_GETIMPL_STORE(DIBasicType, (Tag, SizeInBits, AlignInBits, Encoding,
304                       Flags), Ops);
305 }
306 
307 Optional<DIBasicType::Signedness> DIBasicType::getSignedness() const {
308   switch (getEncoding()) {
309   case dwarf::DW_ATE_signed:
310   case dwarf::DW_ATE_signed_char:
311     return Signedness::Signed;
312   case dwarf::DW_ATE_unsigned:
313   case dwarf::DW_ATE_unsigned_char:
314     return Signedness::Unsigned;
315   default:
316     return None;
317   }
318 }
319 
320 DIDerivedType *DIDerivedType::getImpl(
321     LLVMContext &Context, unsigned Tag, MDString *Name, Metadata *File,
322     unsigned Line, Metadata *Scope, Metadata *BaseType, uint64_t SizeInBits,
323     uint32_t AlignInBits, uint64_t OffsetInBits,
324     Optional<unsigned> DWARFAddressSpace, DIFlags Flags, Metadata *ExtraData,
325     StorageType Storage, bool ShouldCreate) {
326   assert(isCanonical(Name) && "Expected canonical MDString");
327   DEFINE_GETIMPL_LOOKUP(DIDerivedType,
328                         (Tag, Name, File, Line, Scope, BaseType, SizeInBits,
329                          AlignInBits, OffsetInBits, DWARFAddressSpace, Flags,
330                          ExtraData));
331   Metadata *Ops[] = {File, Scope, Name, BaseType, ExtraData};
332   DEFINE_GETIMPL_STORE(
333       DIDerivedType, (Tag, Line, SizeInBits, AlignInBits, OffsetInBits,
334                       DWARFAddressSpace, Flags), Ops);
335 }
336 
337 DICompositeType *DICompositeType::getImpl(
338     LLVMContext &Context, unsigned Tag, MDString *Name, Metadata *File,
339     unsigned Line, Metadata *Scope, Metadata *BaseType, uint64_t SizeInBits,
340     uint32_t AlignInBits, uint64_t OffsetInBits, DIFlags Flags,
341     Metadata *Elements, unsigned RuntimeLang, Metadata *VTableHolder,
342     Metadata *TemplateParams, MDString *Identifier, Metadata *Discriminator,
343     StorageType Storage, bool ShouldCreate) {
344   assert(isCanonical(Name) && "Expected canonical MDString");
345 
346   // Keep this in sync with buildODRType.
347   DEFINE_GETIMPL_LOOKUP(
348       DICompositeType, (Tag, Name, File, Line, Scope, BaseType, SizeInBits,
349                         AlignInBits, OffsetInBits, Flags, Elements, RuntimeLang,
350                         VTableHolder, TemplateParams, Identifier, Discriminator));
351   Metadata *Ops[] = {File,     Scope,        Name,           BaseType,
352                      Elements, VTableHolder, TemplateParams, Identifier,
353                      Discriminator};
354   DEFINE_GETIMPL_STORE(DICompositeType, (Tag, Line, RuntimeLang, SizeInBits,
355                                          AlignInBits, OffsetInBits, Flags),
356                        Ops);
357 }
358 
359 DICompositeType *DICompositeType::buildODRType(
360     LLVMContext &Context, MDString &Identifier, unsigned Tag, MDString *Name,
361     Metadata *File, unsigned Line, Metadata *Scope, Metadata *BaseType,
362     uint64_t SizeInBits, uint32_t AlignInBits, uint64_t OffsetInBits,
363     DIFlags Flags, Metadata *Elements, unsigned RuntimeLang,
364     Metadata *VTableHolder, Metadata *TemplateParams, Metadata *Discriminator) {
365   assert(!Identifier.getString().empty() && "Expected valid identifier");
366   if (!Context.isODRUniquingDebugTypes())
367     return nullptr;
368   auto *&CT = (*Context.pImpl->DITypeMap)[&Identifier];
369   if (!CT)
370     return CT = DICompositeType::getDistinct(
371                Context, Tag, Name, File, Line, Scope, BaseType, SizeInBits,
372                AlignInBits, OffsetInBits, Flags, Elements, RuntimeLang,
373                VTableHolder, TemplateParams, &Identifier, Discriminator);
374 
375   // Only mutate CT if it's a forward declaration and the new operands aren't.
376   assert(CT->getRawIdentifier() == &Identifier && "Wrong ODR identifier?");
377   if (!CT->isForwardDecl() || (Flags & DINode::FlagFwdDecl))
378     return CT;
379 
380   // Mutate CT in place.  Keep this in sync with getImpl.
381   CT->mutate(Tag, Line, RuntimeLang, SizeInBits, AlignInBits, OffsetInBits,
382              Flags);
383   Metadata *Ops[] = {File,     Scope,        Name,           BaseType,
384                      Elements, VTableHolder, TemplateParams, &Identifier,
385                      Discriminator};
386   assert((std::end(Ops) - std::begin(Ops)) == (int)CT->getNumOperands() &&
387          "Mismatched number of operands");
388   for (unsigned I = 0, E = CT->getNumOperands(); I != E; ++I)
389     if (Ops[I] != CT->getOperand(I))
390       CT->setOperand(I, Ops[I]);
391   return CT;
392 }
393 
394 DICompositeType *DICompositeType::getODRType(
395     LLVMContext &Context, MDString &Identifier, unsigned Tag, MDString *Name,
396     Metadata *File, unsigned Line, Metadata *Scope, Metadata *BaseType,
397     uint64_t SizeInBits, uint32_t AlignInBits, uint64_t OffsetInBits,
398     DIFlags Flags, Metadata *Elements, unsigned RuntimeLang,
399     Metadata *VTableHolder, Metadata *TemplateParams, Metadata *Discriminator) {
400   assert(!Identifier.getString().empty() && "Expected valid identifier");
401   if (!Context.isODRUniquingDebugTypes())
402     return nullptr;
403   auto *&CT = (*Context.pImpl->DITypeMap)[&Identifier];
404   if (!CT)
405     CT = DICompositeType::getDistinct(
406         Context, Tag, Name, File, Line, Scope, BaseType, SizeInBits,
407         AlignInBits, OffsetInBits, Flags, Elements, RuntimeLang, VTableHolder,
408         TemplateParams, &Identifier, Discriminator);
409   return CT;
410 }
411 
412 DICompositeType *DICompositeType::getODRTypeIfExists(LLVMContext &Context,
413                                                      MDString &Identifier) {
414   assert(!Identifier.getString().empty() && "Expected valid identifier");
415   if (!Context.isODRUniquingDebugTypes())
416     return nullptr;
417   return Context.pImpl->DITypeMap->lookup(&Identifier);
418 }
419 
420 DISubroutineType *DISubroutineType::getImpl(LLVMContext &Context, DIFlags Flags,
421                                             uint8_t CC, Metadata *TypeArray,
422                                             StorageType Storage,
423                                             bool ShouldCreate) {
424   DEFINE_GETIMPL_LOOKUP(DISubroutineType, (Flags, CC, TypeArray));
425   Metadata *Ops[] = {nullptr, nullptr, nullptr, TypeArray};
426   DEFINE_GETIMPL_STORE(DISubroutineType, (Flags, CC), Ops);
427 }
428 
429 // FIXME: Implement this string-enum correspondence with a .def file and macros,
430 // so that the association is explicit rather than implied.
431 static const char *ChecksumKindName[DIFile::CSK_Last] = {
432   "CSK_MD5",
433   "CSK_SHA1"
434 };
435 
436 StringRef DIFile::getChecksumKindAsString(ChecksumKind CSKind) {
437   assert(CSKind <= DIFile::CSK_Last && "Invalid checksum kind");
438   // The first space was originally the CSK_None variant, which is now
439   // obsolete, but the space is still reserved in ChecksumKind, so we account
440   // for it here.
441   return ChecksumKindName[CSKind - 1];
442 }
443 
444 Optional<DIFile::ChecksumKind> DIFile::getChecksumKind(StringRef CSKindStr) {
445   return StringSwitch<Optional<DIFile::ChecksumKind>>(CSKindStr)
446       .Case("CSK_MD5", DIFile::CSK_MD5)
447       .Case("CSK_SHA1", DIFile::CSK_SHA1)
448       .Default(None);
449 }
450 
451 DIFile *DIFile::getImpl(LLVMContext &Context, MDString *Filename,
452                         MDString *Directory,
453                         Optional<DIFile::ChecksumInfo<MDString *>> CS,
454                         Optional<MDString *> Source, StorageType Storage,
455                         bool ShouldCreate) {
456   assert(isCanonical(Filename) && "Expected canonical MDString");
457   assert(isCanonical(Directory) && "Expected canonical MDString");
458   assert((!CS || isCanonical(CS->Value)) && "Expected canonical MDString");
459   assert((!Source || isCanonical(*Source)) && "Expected canonical MDString");
460   DEFINE_GETIMPL_LOOKUP(DIFile, (Filename, Directory, CS, Source));
461   Metadata *Ops[] = {Filename, Directory, CS ? CS->Value : nullptr,
462                      Source.getValueOr(nullptr)};
463   DEFINE_GETIMPL_STORE(DIFile, (CS, Source), Ops);
464 }
465 
466 DICompileUnit *DICompileUnit::getImpl(
467     LLVMContext &Context, unsigned SourceLanguage, Metadata *File,
468     MDString *Producer, bool IsOptimized, MDString *Flags,
469     unsigned RuntimeVersion, MDString *SplitDebugFilename,
470     unsigned EmissionKind, Metadata *EnumTypes, Metadata *RetainedTypes,
471     Metadata *GlobalVariables, Metadata *ImportedEntities, Metadata *Macros,
472     uint64_t DWOId, bool SplitDebugInlining, bool DebugInfoForProfiling,
473     unsigned NameTableKind, bool RangesBaseAddress, StorageType Storage,
474     bool ShouldCreate) {
475   assert(Storage != Uniqued && "Cannot unique DICompileUnit");
476   assert(isCanonical(Producer) && "Expected canonical MDString");
477   assert(isCanonical(Flags) && "Expected canonical MDString");
478   assert(isCanonical(SplitDebugFilename) && "Expected canonical MDString");
479 
480   Metadata *Ops[] = {
481       File,      Producer,      Flags,           SplitDebugFilename,
482       EnumTypes, RetainedTypes, GlobalVariables, ImportedEntities,
483       Macros};
484   return storeImpl(new (array_lengthof(Ops)) DICompileUnit(
485                        Context, Storage, SourceLanguage, IsOptimized,
486                        RuntimeVersion, EmissionKind, DWOId, SplitDebugInlining,
487                        DebugInfoForProfiling, NameTableKind, RangesBaseAddress,
488                        Ops),
489                    Storage);
490 }
491 
492 Optional<DICompileUnit::DebugEmissionKind>
493 DICompileUnit::getEmissionKind(StringRef Str) {
494   return StringSwitch<Optional<DebugEmissionKind>>(Str)
495       .Case("NoDebug", NoDebug)
496       .Case("FullDebug", FullDebug)
497       .Case("LineTablesOnly", LineTablesOnly)
498       .Case("DebugDirectivesOnly", DebugDirectivesOnly)
499       .Default(None);
500 }
501 
502 Optional<DICompileUnit::DebugNameTableKind>
503 DICompileUnit::getNameTableKind(StringRef Str) {
504   return StringSwitch<Optional<DebugNameTableKind>>(Str)
505       .Case("Default", DebugNameTableKind::Default)
506       .Case("GNU", DebugNameTableKind::GNU)
507       .Case("None", DebugNameTableKind::None)
508       .Default(None);
509 }
510 
511 const char *DICompileUnit::emissionKindString(DebugEmissionKind EK) {
512   switch (EK) {
513   case NoDebug:        return "NoDebug";
514   case FullDebug:      return "FullDebug";
515   case LineTablesOnly: return "LineTablesOnly";
516   case DebugDirectivesOnly: return "DebugDirectivesOnly";
517   }
518   return nullptr;
519 }
520 
521 const char *DICompileUnit::nameTableKindString(DebugNameTableKind NTK) {
522   switch (NTK) {
523   case DebugNameTableKind::Default:
524     return nullptr;
525   case DebugNameTableKind::GNU:
526     return "GNU";
527   case DebugNameTableKind::None:
528     return "None";
529   }
530   return nullptr;
531 }
532 
533 DISubprogram *DILocalScope::getSubprogram() const {
534   if (auto *Block = dyn_cast<DILexicalBlockBase>(this))
535     return Block->getScope()->getSubprogram();
536   return const_cast<DISubprogram *>(cast<DISubprogram>(this));
537 }
538 
539 DILocalScope *DILocalScope::getNonLexicalBlockFileScope() const {
540   if (auto *File = dyn_cast<DILexicalBlockFile>(this))
541     return File->getScope()->getNonLexicalBlockFileScope();
542   return const_cast<DILocalScope *>(this);
543 }
544 
545 DISubprogram::DISPFlags DISubprogram::getFlag(StringRef Flag) {
546   return StringSwitch<DISPFlags>(Flag)
547 #define HANDLE_DISP_FLAG(ID, NAME) .Case("DISPFlag" #NAME, SPFlag##NAME)
548 #include "llvm/IR/DebugInfoFlags.def"
549       .Default(SPFlagZero);
550 }
551 
552 StringRef DISubprogram::getFlagString(DISPFlags Flag) {
553   switch (Flag) {
554   case SPFlagVirtuality: // Appease a warning.
555     return "";
556 #define HANDLE_DISP_FLAG(ID, NAME)                                             \
557   case SPFlag##NAME:                                                           \
558     return "DISPFlag" #NAME;
559 #include "llvm/IR/DebugInfoFlags.def"
560   }
561   return "";
562 }
563 
564 DISubprogram::DISPFlags
565 DISubprogram::splitFlags(DISPFlags Flags,
566                          SmallVectorImpl<DISPFlags> &SplitFlags) {
567   // Multi-bit fields can require special handling. In our case, however, the
568   // only multi-bit field is virtuality, and all its values happen to be
569   // single-bit values, so the right behavior just falls out.
570 #define HANDLE_DISP_FLAG(ID, NAME)                                             \
571   if (DISPFlags Bit = Flags & SPFlag##NAME) {                                  \
572     SplitFlags.push_back(Bit);                                                 \
573     Flags &= ~Bit;                                                             \
574   }
575 #include "llvm/IR/DebugInfoFlags.def"
576   return Flags;
577 }
578 
579 DISubprogram *DISubprogram::getImpl(
580     LLVMContext &Context, Metadata *Scope, MDString *Name,
581     MDString *LinkageName, Metadata *File, unsigned Line, Metadata *Type,
582     unsigned ScopeLine, Metadata *ContainingType, unsigned VirtualIndex,
583     int ThisAdjustment, DIFlags Flags, DISPFlags SPFlags, Metadata *Unit,
584     Metadata *TemplateParams, Metadata *Declaration, Metadata *RetainedNodes,
585     Metadata *ThrownTypes, StorageType Storage, bool ShouldCreate) {
586   assert(isCanonical(Name) && "Expected canonical MDString");
587   assert(isCanonical(LinkageName) && "Expected canonical MDString");
588   DEFINE_GETIMPL_LOOKUP(DISubprogram,
589                         (Scope, Name, LinkageName, File, Line, Type, ScopeLine,
590                          ContainingType, VirtualIndex, ThisAdjustment, Flags,
591                          SPFlags, Unit, TemplateParams, Declaration,
592                          RetainedNodes, ThrownTypes));
593   SmallVector<Metadata *, 11> Ops = {
594       File,        Scope,         Name,           LinkageName,    Type,       Unit,
595       Declaration, RetainedNodes, ContainingType, TemplateParams, ThrownTypes};
596   if (!ThrownTypes) {
597     Ops.pop_back();
598     if (!TemplateParams) {
599       Ops.pop_back();
600       if (!ContainingType)
601         Ops.pop_back();
602     }
603   }
604   DEFINE_GETIMPL_STORE_N(
605       DISubprogram,
606       (Line, ScopeLine, VirtualIndex, ThisAdjustment, Flags, SPFlags), Ops,
607       Ops.size());
608 }
609 
610 bool DISubprogram::describes(const Function *F) const {
611   assert(F && "Invalid function");
612   if (F->getSubprogram() == this)
613     return true;
614   StringRef Name = getLinkageName();
615   if (Name.empty())
616     Name = getName();
617   return F->getName() == Name;
618 }
619 
620 DILexicalBlock *DILexicalBlock::getImpl(LLVMContext &Context, Metadata *Scope,
621                                         Metadata *File, unsigned Line,
622                                         unsigned Column, StorageType Storage,
623                                         bool ShouldCreate) {
624   // Fixup column.
625   adjustColumn(Column);
626 
627   assert(Scope && "Expected scope");
628   DEFINE_GETIMPL_LOOKUP(DILexicalBlock, (Scope, File, Line, Column));
629   Metadata *Ops[] = {File, Scope};
630   DEFINE_GETIMPL_STORE(DILexicalBlock, (Line, Column), Ops);
631 }
632 
633 DILexicalBlockFile *DILexicalBlockFile::getImpl(LLVMContext &Context,
634                                                 Metadata *Scope, Metadata *File,
635                                                 unsigned Discriminator,
636                                                 StorageType Storage,
637                                                 bool ShouldCreate) {
638   assert(Scope && "Expected scope");
639   DEFINE_GETIMPL_LOOKUP(DILexicalBlockFile, (Scope, File, Discriminator));
640   Metadata *Ops[] = {File, Scope};
641   DEFINE_GETIMPL_STORE(DILexicalBlockFile, (Discriminator), Ops);
642 }
643 
644 DINamespace *DINamespace::getImpl(LLVMContext &Context, Metadata *Scope,
645                                   MDString *Name, bool ExportSymbols,
646                                   StorageType Storage, bool ShouldCreate) {
647   assert(isCanonical(Name) && "Expected canonical MDString");
648   DEFINE_GETIMPL_LOOKUP(DINamespace, (Scope, Name, ExportSymbols));
649   // The nullptr is for DIScope's File operand. This should be refactored.
650   Metadata *Ops[] = {nullptr, Scope, Name};
651   DEFINE_GETIMPL_STORE(DINamespace, (ExportSymbols), Ops);
652 }
653 
654 DIModule *DIModule::getImpl(LLVMContext &Context, Metadata *Scope,
655                             MDString *Name, MDString *ConfigurationMacros,
656                             MDString *IncludePath, MDString *ISysRoot,
657                             StorageType Storage, bool ShouldCreate) {
658   assert(isCanonical(Name) && "Expected canonical MDString");
659   DEFINE_GETIMPL_LOOKUP(
660       DIModule, (Scope, Name, ConfigurationMacros, IncludePath, ISysRoot));
661   Metadata *Ops[] = {Scope, Name, ConfigurationMacros, IncludePath, ISysRoot};
662   DEFINE_GETIMPL_STORE_NO_CONSTRUCTOR_ARGS(DIModule, Ops);
663 }
664 
665 DITemplateTypeParameter *DITemplateTypeParameter::getImpl(LLVMContext &Context,
666                                                           MDString *Name,
667                                                           Metadata *Type,
668                                                           StorageType Storage,
669                                                           bool ShouldCreate) {
670   assert(isCanonical(Name) && "Expected canonical MDString");
671   DEFINE_GETIMPL_LOOKUP(DITemplateTypeParameter, (Name, Type));
672   Metadata *Ops[] = {Name, Type};
673   DEFINE_GETIMPL_STORE_NO_CONSTRUCTOR_ARGS(DITemplateTypeParameter, Ops);
674 }
675 
676 DITemplateValueParameter *DITemplateValueParameter::getImpl(
677     LLVMContext &Context, unsigned Tag, MDString *Name, Metadata *Type,
678     Metadata *Value, StorageType Storage, bool ShouldCreate) {
679   assert(isCanonical(Name) && "Expected canonical MDString");
680   DEFINE_GETIMPL_LOOKUP(DITemplateValueParameter, (Tag, Name, Type, Value));
681   Metadata *Ops[] = {Name, Type, Value};
682   DEFINE_GETIMPL_STORE(DITemplateValueParameter, (Tag), Ops);
683 }
684 
685 DIGlobalVariable *
686 DIGlobalVariable::getImpl(LLVMContext &Context, Metadata *Scope, MDString *Name,
687                           MDString *LinkageName, Metadata *File, unsigned Line,
688                           Metadata *Type, bool IsLocalToUnit, bool IsDefinition,
689                           Metadata *StaticDataMemberDeclaration,
690                           Metadata *TemplateParams, uint32_t AlignInBits,
691                           StorageType Storage, bool ShouldCreate) {
692   assert(isCanonical(Name) && "Expected canonical MDString");
693   assert(isCanonical(LinkageName) && "Expected canonical MDString");
694   DEFINE_GETIMPL_LOOKUP(DIGlobalVariable, (Scope, Name, LinkageName, File, Line,
695                                            Type, IsLocalToUnit, IsDefinition,
696                                            StaticDataMemberDeclaration,
697                                            TemplateParams, AlignInBits));
698   Metadata *Ops[] = {Scope,
699                      Name,
700                      File,
701                      Type,
702                      Name,
703                      LinkageName,
704                      StaticDataMemberDeclaration,
705                      TemplateParams};
706   DEFINE_GETIMPL_STORE(DIGlobalVariable,
707                        (Line, IsLocalToUnit, IsDefinition, AlignInBits), Ops);
708 }
709 
710 DILocalVariable *DILocalVariable::getImpl(LLVMContext &Context, Metadata *Scope,
711                                           MDString *Name, Metadata *File,
712                                           unsigned Line, Metadata *Type,
713                                           unsigned Arg, DIFlags Flags,
714                                           uint32_t AlignInBits,
715                                           StorageType Storage,
716                                           bool ShouldCreate) {
717   // 64K ought to be enough for any frontend.
718   assert(Arg <= UINT16_MAX && "Expected argument number to fit in 16-bits");
719 
720   assert(Scope && "Expected scope");
721   assert(isCanonical(Name) && "Expected canonical MDString");
722   DEFINE_GETIMPL_LOOKUP(DILocalVariable,
723                         (Scope, Name, File, Line, Type, Arg, Flags,
724                          AlignInBits));
725   Metadata *Ops[] = {Scope, Name, File, Type};
726   DEFINE_GETIMPL_STORE(DILocalVariable, (Line, Arg, Flags, AlignInBits), Ops);
727 }
728 
729 Optional<uint64_t> DIVariable::getSizeInBits() const {
730   // This is used by the Verifier so be mindful of broken types.
731   const Metadata *RawType = getRawType();
732   while (RawType) {
733     // Try to get the size directly.
734     if (auto *T = dyn_cast<DIType>(RawType))
735       if (uint64_t Size = T->getSizeInBits())
736         return Size;
737 
738     if (auto *DT = dyn_cast<DIDerivedType>(RawType)) {
739       // Look at the base type.
740       RawType = DT->getRawBaseType();
741       continue;
742     }
743 
744     // Missing type or size.
745     break;
746   }
747 
748   // Fail gracefully.
749   return None;
750 }
751 
752 DILabel *DILabel::getImpl(LLVMContext &Context, Metadata *Scope,
753                           MDString *Name, Metadata *File, unsigned Line,
754                           StorageType Storage,
755                           bool ShouldCreate) {
756   assert(Scope && "Expected scope");
757   assert(isCanonical(Name) && "Expected canonical MDString");
758   DEFINE_GETIMPL_LOOKUP(DILabel,
759                         (Scope, Name, File, Line));
760   Metadata *Ops[] = {Scope, Name, File};
761   DEFINE_GETIMPL_STORE(DILabel, (Line), Ops);
762 }
763 
764 DIExpression *DIExpression::getImpl(LLVMContext &Context,
765                                     ArrayRef<uint64_t> Elements,
766                                     StorageType Storage, bool ShouldCreate) {
767   DEFINE_GETIMPL_LOOKUP(DIExpression, (Elements));
768   DEFINE_GETIMPL_STORE_NO_OPS(DIExpression, (Elements));
769 }
770 
771 unsigned DIExpression::ExprOperand::getSize() const {
772   switch (getOp()) {
773   case dwarf::DW_OP_LLVM_fragment:
774     return 3;
775   case dwarf::DW_OP_constu:
776   case dwarf::DW_OP_plus_uconst:
777     return 2;
778   default:
779     return 1;
780   }
781 }
782 
783 bool DIExpression::isValid() const {
784   for (auto I = expr_op_begin(), E = expr_op_end(); I != E; ++I) {
785     // Check that there's space for the operand.
786     if (I->get() + I->getSize() > E->get())
787       return false;
788 
789     // Check that the operand is valid.
790     switch (I->getOp()) {
791     default:
792       return false;
793     case dwarf::DW_OP_LLVM_fragment:
794       // A fragment operator must appear at the end.
795       return I->get() + I->getSize() == E->get();
796     case dwarf::DW_OP_stack_value: {
797       // Must be the last one or followed by a DW_OP_LLVM_fragment.
798       if (I->get() + I->getSize() == E->get())
799         break;
800       auto J = I;
801       if ((++J)->getOp() != dwarf::DW_OP_LLVM_fragment)
802         return false;
803       break;
804     }
805     case dwarf::DW_OP_swap: {
806       // Must be more than one implicit element on the stack.
807 
808       // FIXME: A better way to implement this would be to add a local variable
809       // that keeps track of the stack depth and introduce something like a
810       // DW_LLVM_OP_implicit_location as a placeholder for the location this
811       // DIExpression is attached to, or else pass the number of implicit stack
812       // elements into isValid.
813       if (getNumElements() == 1)
814         return false;
815       break;
816     }
817     case dwarf::DW_OP_constu:
818     case dwarf::DW_OP_plus_uconst:
819     case dwarf::DW_OP_plus:
820     case dwarf::DW_OP_minus:
821     case dwarf::DW_OP_mul:
822     case dwarf::DW_OP_div:
823     case dwarf::DW_OP_mod:
824     case dwarf::DW_OP_or:
825     case dwarf::DW_OP_and:
826     case dwarf::DW_OP_xor:
827     case dwarf::DW_OP_shl:
828     case dwarf::DW_OP_shr:
829     case dwarf::DW_OP_shra:
830     case dwarf::DW_OP_deref:
831     case dwarf::DW_OP_xderef:
832     case dwarf::DW_OP_lit0:
833     case dwarf::DW_OP_not:
834     case dwarf::DW_OP_dup:
835       break;
836     }
837   }
838   return true;
839 }
840 
841 Optional<DIExpression::FragmentInfo>
842 DIExpression::getFragmentInfo(expr_op_iterator Start, expr_op_iterator End) {
843   for (auto I = Start; I != End; ++I)
844     if (I->getOp() == dwarf::DW_OP_LLVM_fragment) {
845       DIExpression::FragmentInfo Info = {I->getArg(1), I->getArg(0)};
846       return Info;
847     }
848   return None;
849 }
850 
851 void DIExpression::appendOffset(SmallVectorImpl<uint64_t> &Ops,
852                                 int64_t Offset) {
853   if (Offset > 0) {
854     Ops.push_back(dwarf::DW_OP_plus_uconst);
855     Ops.push_back(Offset);
856   } else if (Offset < 0) {
857     Ops.push_back(dwarf::DW_OP_constu);
858     Ops.push_back(-Offset);
859     Ops.push_back(dwarf::DW_OP_minus);
860   }
861 }
862 
863 bool DIExpression::extractIfOffset(int64_t &Offset) const {
864   if (getNumElements() == 0) {
865     Offset = 0;
866     return true;
867   }
868 
869   if (getNumElements() == 2 && Elements[0] == dwarf::DW_OP_plus_uconst) {
870     Offset = Elements[1];
871     return true;
872   }
873 
874   if (getNumElements() == 3 && Elements[0] == dwarf::DW_OP_constu) {
875     if (Elements[2] == dwarf::DW_OP_plus) {
876       Offset = Elements[1];
877       return true;
878     }
879     if (Elements[2] == dwarf::DW_OP_minus) {
880       Offset = -Elements[1];
881       return true;
882     }
883   }
884 
885   return false;
886 }
887 
888 DIExpression *DIExpression::prepend(const DIExpression *Expr, bool DerefBefore,
889                                     int64_t Offset, bool DerefAfter,
890                                     bool StackValue) {
891   SmallVector<uint64_t, 8> Ops;
892   if (DerefBefore)
893     Ops.push_back(dwarf::DW_OP_deref);
894 
895   appendOffset(Ops, Offset);
896   if (DerefAfter)
897     Ops.push_back(dwarf::DW_OP_deref);
898 
899   return prependOpcodes(Expr, Ops, StackValue);
900 }
901 
902 DIExpression *DIExpression::prependOpcodes(const DIExpression *Expr,
903                                            SmallVectorImpl<uint64_t> &Ops,
904                                            bool StackValue) {
905   assert(Expr && "Can't prepend ops to this expression");
906 
907   // If there are no ops to prepend, do not even add the DW_OP_stack_value.
908   if (Ops.empty())
909     StackValue = false;
910   for (auto Op : Expr->expr_ops()) {
911     // A DW_OP_stack_value comes at the end, but before a DW_OP_LLVM_fragment.
912     if (StackValue) {
913       if (Op.getOp() == dwarf::DW_OP_stack_value)
914         StackValue = false;
915       else if (Op.getOp() == dwarf::DW_OP_LLVM_fragment) {
916         Ops.push_back(dwarf::DW_OP_stack_value);
917         StackValue = false;
918       }
919     }
920     Op.appendToVector(Ops);
921   }
922   if (StackValue)
923     Ops.push_back(dwarf::DW_OP_stack_value);
924   return DIExpression::get(Expr->getContext(), Ops);
925 }
926 
927 DIExpression *DIExpression::append(const DIExpression *Expr,
928                                    ArrayRef<uint64_t> Ops) {
929   assert(Expr && !Ops.empty() && "Can't append ops to this expression");
930 
931   // Copy Expr's current op list.
932   SmallVector<uint64_t, 16> NewOps;
933   for (auto Op : Expr->expr_ops()) {
934     // Append new opcodes before DW_OP_{stack_value, LLVM_fragment}.
935     if (Op.getOp() == dwarf::DW_OP_stack_value ||
936         Op.getOp() == dwarf::DW_OP_LLVM_fragment) {
937       NewOps.append(Ops.begin(), Ops.end());
938 
939       // Ensure that the new opcodes are only appended once.
940       Ops = None;
941     }
942     Op.appendToVector(NewOps);
943   }
944 
945   NewOps.append(Ops.begin(), Ops.end());
946   return DIExpression::get(Expr->getContext(), NewOps);
947 }
948 
949 DIExpression *DIExpression::appendToStack(const DIExpression *Expr,
950                                           ArrayRef<uint64_t> Ops) {
951   assert(Expr && !Ops.empty() && "Can't append ops to this expression");
952   assert(none_of(Ops,
953                  [](uint64_t Op) {
954                    return Op == dwarf::DW_OP_stack_value ||
955                           Op == dwarf::DW_OP_LLVM_fragment;
956                  }) &&
957          "Can't append this op");
958 
959   // Append a DW_OP_deref after Expr's current op list if it's non-empty and
960   // has no DW_OP_stack_value.
961   //
962   // Match .* DW_OP_stack_value (DW_OP_LLVM_fragment A B)?.
963   Optional<FragmentInfo> FI = Expr->getFragmentInfo();
964   unsigned DropUntilStackValue = FI.hasValue() ? 3 : 0;
965   ArrayRef<uint64_t> ExprOpsBeforeFragment =
966       Expr->getElements().drop_back(DropUntilStackValue);
967   bool NeedsDeref = (Expr->getNumElements() > DropUntilStackValue) &&
968                     (ExprOpsBeforeFragment.back() != dwarf::DW_OP_stack_value);
969   bool NeedsStackValue = NeedsDeref || ExprOpsBeforeFragment.empty();
970 
971   // Append a DW_OP_deref after Expr's current op list if needed, then append
972   // the new ops, and finally ensure that a single DW_OP_stack_value is present.
973   SmallVector<uint64_t, 16> NewOps;
974   if (NeedsDeref)
975     NewOps.push_back(dwarf::DW_OP_deref);
976   NewOps.append(Ops.begin(), Ops.end());
977   if (NeedsStackValue)
978     NewOps.push_back(dwarf::DW_OP_stack_value);
979   return DIExpression::append(Expr, NewOps);
980 }
981 
982 Optional<DIExpression *> DIExpression::createFragmentExpression(
983     const DIExpression *Expr, unsigned OffsetInBits, unsigned SizeInBits) {
984   SmallVector<uint64_t, 8> Ops;
985   // Copy over the expression, but leave off any trailing DW_OP_LLVM_fragment.
986   if (Expr) {
987     for (auto Op : Expr->expr_ops()) {
988       switch (Op.getOp()) {
989       default: break;
990       case dwarf::DW_OP_plus:
991       case dwarf::DW_OP_minus:
992         // We can't safely split arithmetic into multiple fragments because we
993         // can't express carry-over between fragments.
994         //
995         // FIXME: We *could* preserve the lowest fragment of a constant offset
996         // operation if the offset fits into SizeInBits.
997         return None;
998       case dwarf::DW_OP_LLVM_fragment: {
999         // Make the new offset point into the existing fragment.
1000         uint64_t FragmentOffsetInBits = Op.getArg(0);
1001         uint64_t FragmentSizeInBits = Op.getArg(1);
1002         (void)FragmentSizeInBits;
1003         assert((OffsetInBits + SizeInBits <= FragmentSizeInBits) &&
1004                "new fragment outside of original fragment");
1005         OffsetInBits += FragmentOffsetInBits;
1006         continue;
1007       }
1008       }
1009       Op.appendToVector(Ops);
1010     }
1011   }
1012   Ops.push_back(dwarf::DW_OP_LLVM_fragment);
1013   Ops.push_back(OffsetInBits);
1014   Ops.push_back(SizeInBits);
1015   return DIExpression::get(Expr->getContext(), Ops);
1016 }
1017 
1018 bool DIExpression::isConstant() const {
1019   // Recognize DW_OP_constu C DW_OP_stack_value (DW_OP_LLVM_fragment Len Ofs)?.
1020   if (getNumElements() != 3 && getNumElements() != 6)
1021     return false;
1022   if (getElement(0) != dwarf::DW_OP_constu ||
1023       getElement(2) != dwarf::DW_OP_stack_value)
1024     return false;
1025   if (getNumElements() == 6 && getElement(3) != dwarf::DW_OP_LLVM_fragment)
1026     return false;
1027   return true;
1028 }
1029 
1030 DIGlobalVariableExpression *
1031 DIGlobalVariableExpression::getImpl(LLVMContext &Context, Metadata *Variable,
1032                                     Metadata *Expression, StorageType Storage,
1033                                     bool ShouldCreate) {
1034   DEFINE_GETIMPL_LOOKUP(DIGlobalVariableExpression, (Variable, Expression));
1035   Metadata *Ops[] = {Variable, Expression};
1036   DEFINE_GETIMPL_STORE_NO_CONSTRUCTOR_ARGS(DIGlobalVariableExpression, Ops);
1037 }
1038 
1039 DIObjCProperty *DIObjCProperty::getImpl(
1040     LLVMContext &Context, MDString *Name, Metadata *File, unsigned Line,
1041     MDString *GetterName, MDString *SetterName, unsigned Attributes,
1042     Metadata *Type, StorageType Storage, bool ShouldCreate) {
1043   assert(isCanonical(Name) && "Expected canonical MDString");
1044   assert(isCanonical(GetterName) && "Expected canonical MDString");
1045   assert(isCanonical(SetterName) && "Expected canonical MDString");
1046   DEFINE_GETIMPL_LOOKUP(DIObjCProperty, (Name, File, Line, GetterName,
1047                                          SetterName, Attributes, Type));
1048   Metadata *Ops[] = {Name, File, GetterName, SetterName, Type};
1049   DEFINE_GETIMPL_STORE(DIObjCProperty, (Line, Attributes), Ops);
1050 }
1051 
1052 DIImportedEntity *DIImportedEntity::getImpl(LLVMContext &Context, unsigned Tag,
1053                                             Metadata *Scope, Metadata *Entity,
1054                                             Metadata *File, unsigned Line,
1055                                             MDString *Name, StorageType Storage,
1056                                             bool ShouldCreate) {
1057   assert(isCanonical(Name) && "Expected canonical MDString");
1058   DEFINE_GETIMPL_LOOKUP(DIImportedEntity,
1059                         (Tag, Scope, Entity, File, Line, Name));
1060   Metadata *Ops[] = {Scope, Entity, Name, File};
1061   DEFINE_GETIMPL_STORE(DIImportedEntity, (Tag, Line), Ops);
1062 }
1063 
1064 DIMacro *DIMacro::getImpl(LLVMContext &Context, unsigned MIType,
1065                           unsigned Line, MDString *Name, MDString *Value,
1066                           StorageType Storage, bool ShouldCreate) {
1067   assert(isCanonical(Name) && "Expected canonical MDString");
1068   DEFINE_GETIMPL_LOOKUP(DIMacro, (MIType, Line, Name, Value));
1069   Metadata *Ops[] = { Name, Value };
1070   DEFINE_GETIMPL_STORE(DIMacro, (MIType, Line), Ops);
1071 }
1072 
1073 DIMacroFile *DIMacroFile::getImpl(LLVMContext &Context, unsigned MIType,
1074                                   unsigned Line, Metadata *File,
1075                                   Metadata *Elements, StorageType Storage,
1076                                   bool ShouldCreate) {
1077   DEFINE_GETIMPL_LOOKUP(DIMacroFile,
1078                         (MIType, Line, File, Elements));
1079   Metadata *Ops[] = { File, Elements };
1080   DEFINE_GETIMPL_STORE(DIMacroFile, (MIType, Line), Ops);
1081 }
1082