1 //===- DebugInfo.cpp - Debug Information Helper Classes -------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file implements the helper classes used to build and interpret debug
10 // information in LLVM IR form.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "llvm-c/DebugInfo.h"
15 #include "llvm/ADT/DenseMap.h"
16 #include "llvm/ADT/DenseSet.h"
17 #include "llvm/ADT/None.h"
18 #include "llvm/ADT/STLExtras.h"
19 #include "llvm/ADT/SmallPtrSet.h"
20 #include "llvm/ADT/SmallVector.h"
21 #include "llvm/ADT/StringRef.h"
22 #include "llvm/IR/BasicBlock.h"
23 #include "llvm/IR/Constants.h"
24 #include "llvm/IR/DebugInfoMetadata.h"
25 #include "llvm/IR/DebugLoc.h"
26 #include "llvm/IR/DebugInfo.h"
27 #include "llvm/IR/DIBuilder.h"
28 #include "llvm/IR/Function.h"
29 #include "llvm/IR/GVMaterializer.h"
30 #include "llvm/IR/Instruction.h"
31 #include "llvm/IR/IntrinsicInst.h"
32 #include "llvm/IR/LLVMContext.h"
33 #include "llvm/IR/Metadata.h"
34 #include "llvm/IR/Module.h"
35 #include "llvm/Support/Casting.h"
36 #include <algorithm>
37 #include <cassert>
38 #include <utility>
39 
40 using namespace llvm;
41 using namespace llvm::dwarf;
42 
43 /// Finds all intrinsics declaring local variables as living in the memory that
44 /// 'V' points to. This may include a mix of dbg.declare and
45 /// dbg.addr intrinsics.
46 TinyPtrVector<DbgVariableIntrinsic *> llvm::FindDbgAddrUses(Value *V) {
47   // This function is hot. Check whether the value has any metadata to avoid a
48   // DenseMap lookup.
49   if (!V->isUsedByMetadata())
50     return {};
51   auto *L = LocalAsMetadata::getIfExists(V);
52   if (!L)
53     return {};
54   auto *MDV = MetadataAsValue::getIfExists(V->getContext(), L);
55   if (!MDV)
56     return {};
57 
58   TinyPtrVector<DbgVariableIntrinsic *> Declares;
59   for (User *U : MDV->users()) {
60     if (auto *DII = dyn_cast<DbgVariableIntrinsic>(U))
61       if (DII->isAddressOfVariable())
62         Declares.push_back(DII);
63   }
64 
65   return Declares;
66 }
67 
68 TinyPtrVector<DbgDeclareInst *> llvm::FindDbgDeclareUses(Value *V) {
69   TinyPtrVector<DbgDeclareInst *> DDIs;
70   for (DbgVariableIntrinsic *DVI : FindDbgAddrUses(V))
71     if (auto *DDI = dyn_cast<DbgDeclareInst>(DVI))
72       DDIs.push_back(DDI);
73   return DDIs;
74 }
75 
76 void llvm::findDbgValues(SmallVectorImpl<DbgValueInst *> &DbgValues, Value *V) {
77   // This function is hot. Check whether the value has any metadata to avoid a
78   // DenseMap lookup.
79   if (!V->isUsedByMetadata())
80     return;
81   // TODO: If this value appears multiple times in a DIArgList, we should still
82   // only add the owning DbgValueInst once; use this set to track ArgListUsers.
83   // This behaviour can be removed when we can automatically remove duplicates.
84   SmallPtrSet<DbgValueInst *, 4> EncounteredDbgValues;
85   if (auto *L = LocalAsMetadata::getIfExists(V)) {
86     if (auto *MDV = MetadataAsValue::getIfExists(V->getContext(), L)) {
87       for (User *U : MDV->users())
88         if (DbgValueInst *DVI = dyn_cast<DbgValueInst>(U))
89           DbgValues.push_back(DVI);
90     }
91     for (Metadata *AL : L->getAllArgListUsers()) {
92       if (auto *MDV = MetadataAsValue::getIfExists(V->getContext(), AL)) {
93         for (User *U : MDV->users())
94           if (DbgValueInst *DVI = dyn_cast<DbgValueInst>(U))
95             if (EncounteredDbgValues.insert(DVI).second)
96               DbgValues.push_back(DVI);
97       }
98     }
99   }
100 }
101 
102 void llvm::findDbgUsers(SmallVectorImpl<DbgVariableIntrinsic *> &DbgUsers,
103                         Value *V) {
104   // This function is hot. Check whether the value has any metadata to avoid a
105   // DenseMap lookup.
106   if (!V->isUsedByMetadata())
107     return;
108   // TODO: If this value appears multiple times in a DIArgList, we should still
109   // only add the owning DbgValueInst once; use this set to track ArgListUsers.
110   // This behaviour can be removed when we can automatically remove duplicates.
111   SmallPtrSet<DbgVariableIntrinsic *, 4> EncounteredDbgValues;
112   if (auto *L = LocalAsMetadata::getIfExists(V)) {
113     if (auto *MDV = MetadataAsValue::getIfExists(V->getContext(), L)) {
114       for (User *U : MDV->users())
115         if (DbgVariableIntrinsic *DII = dyn_cast<DbgVariableIntrinsic>(U))
116           DbgUsers.push_back(DII);
117     }
118     for (Metadata *AL : L->getAllArgListUsers()) {
119       if (auto *MDV = MetadataAsValue::getIfExists(V->getContext(), AL)) {
120         for (User *U : MDV->users())
121           if (DbgVariableIntrinsic *DII = dyn_cast<DbgVariableIntrinsic>(U))
122             if (EncounteredDbgValues.insert(DII).second)
123               DbgUsers.push_back(DII);
124       }
125     }
126   }
127 }
128 
129 DISubprogram *llvm::getDISubprogram(const MDNode *Scope) {
130   if (auto *LocalScope = dyn_cast_or_null<DILocalScope>(Scope))
131     return LocalScope->getSubprogram();
132   return nullptr;
133 }
134 
135 //===----------------------------------------------------------------------===//
136 // DebugInfoFinder implementations.
137 //===----------------------------------------------------------------------===//
138 
139 void DebugInfoFinder::reset() {
140   CUs.clear();
141   SPs.clear();
142   GVs.clear();
143   TYs.clear();
144   Scopes.clear();
145   NodesSeen.clear();
146 }
147 
148 void DebugInfoFinder::processModule(const Module &M) {
149   for (auto *CU : M.debug_compile_units())
150     processCompileUnit(CU);
151   for (auto &F : M.functions()) {
152     if (auto *SP = cast_or_null<DISubprogram>(F.getSubprogram()))
153       processSubprogram(SP);
154     // There could be subprograms from inlined functions referenced from
155     // instructions only. Walk the function to find them.
156     for (const BasicBlock &BB : F)
157       for (const Instruction &I : BB)
158         processInstruction(M, I);
159   }
160 }
161 
162 void DebugInfoFinder::processCompileUnit(DICompileUnit *CU) {
163   if (!addCompileUnit(CU))
164     return;
165   for (auto DIG : CU->getGlobalVariables()) {
166     if (!addGlobalVariable(DIG))
167       continue;
168     auto *GV = DIG->getVariable();
169     processScope(GV->getScope());
170     processType(GV->getType());
171   }
172   for (auto *ET : CU->getEnumTypes())
173     processType(ET);
174   for (auto *RT : CU->getRetainedTypes())
175     if (auto *T = dyn_cast<DIType>(RT))
176       processType(T);
177     else
178       processSubprogram(cast<DISubprogram>(RT));
179   for (auto *Import : CU->getImportedEntities()) {
180     auto *Entity = Import->getEntity();
181     if (auto *T = dyn_cast<DIType>(Entity))
182       processType(T);
183     else if (auto *SP = dyn_cast<DISubprogram>(Entity))
184       processSubprogram(SP);
185     else if (auto *NS = dyn_cast<DINamespace>(Entity))
186       processScope(NS->getScope());
187     else if (auto *M = dyn_cast<DIModule>(Entity))
188       processScope(M->getScope());
189   }
190 }
191 
192 void DebugInfoFinder::processInstruction(const Module &M,
193                                          const Instruction &I) {
194   if (auto *DVI = dyn_cast<DbgVariableIntrinsic>(&I))
195     processVariable(M, *DVI);
196 
197   if (auto DbgLoc = I.getDebugLoc())
198     processLocation(M, DbgLoc.get());
199 }
200 
201 void DebugInfoFinder::processLocation(const Module &M, const DILocation *Loc) {
202   if (!Loc)
203     return;
204   processScope(Loc->getScope());
205   processLocation(M, Loc->getInlinedAt());
206 }
207 
208 void DebugInfoFinder::processType(DIType *DT) {
209   if (!addType(DT))
210     return;
211   processScope(DT->getScope());
212   if (auto *ST = dyn_cast<DISubroutineType>(DT)) {
213     for (DIType *Ref : ST->getTypeArray())
214       processType(Ref);
215     return;
216   }
217   if (auto *DCT = dyn_cast<DICompositeType>(DT)) {
218     processType(DCT->getBaseType());
219     for (Metadata *D : DCT->getElements()) {
220       if (auto *T = dyn_cast<DIType>(D))
221         processType(T);
222       else if (auto *SP = dyn_cast<DISubprogram>(D))
223         processSubprogram(SP);
224     }
225     return;
226   }
227   if (auto *DDT = dyn_cast<DIDerivedType>(DT)) {
228     processType(DDT->getBaseType());
229   }
230 }
231 
232 void DebugInfoFinder::processScope(DIScope *Scope) {
233   if (!Scope)
234     return;
235   if (auto *Ty = dyn_cast<DIType>(Scope)) {
236     processType(Ty);
237     return;
238   }
239   if (auto *CU = dyn_cast<DICompileUnit>(Scope)) {
240     addCompileUnit(CU);
241     return;
242   }
243   if (auto *SP = dyn_cast<DISubprogram>(Scope)) {
244     processSubprogram(SP);
245     return;
246   }
247   if (!addScope(Scope))
248     return;
249   if (auto *LB = dyn_cast<DILexicalBlockBase>(Scope)) {
250     processScope(LB->getScope());
251   } else if (auto *NS = dyn_cast<DINamespace>(Scope)) {
252     processScope(NS->getScope());
253   } else if (auto *M = dyn_cast<DIModule>(Scope)) {
254     processScope(M->getScope());
255   }
256 }
257 
258 void DebugInfoFinder::processSubprogram(DISubprogram *SP) {
259   if (!addSubprogram(SP))
260     return;
261   processScope(SP->getScope());
262   // Some of the users, e.g. CloneFunctionInto / CloneModule, need to set up a
263   // ValueMap containing identity mappings for all of the DICompileUnit's, not
264   // just DISubprogram's, referenced from anywhere within the Function being
265   // cloned prior to calling MapMetadata / RemapInstruction to avoid their
266   // duplication later as DICompileUnit's are also directly referenced by
267   // llvm.dbg.cu list. Thefore we need to collect DICompileUnit's here as well.
268   // Also, DICompileUnit's may reference DISubprogram's too and therefore need
269   // to be at least looked through.
270   processCompileUnit(SP->getUnit());
271   processType(SP->getType());
272   for (auto *Element : SP->getTemplateParams()) {
273     if (auto *TType = dyn_cast<DITemplateTypeParameter>(Element)) {
274       processType(TType->getType());
275     } else if (auto *TVal = dyn_cast<DITemplateValueParameter>(Element)) {
276       processType(TVal->getType());
277     }
278   }
279 }
280 
281 void DebugInfoFinder::processVariable(const Module &M,
282                                       const DbgVariableIntrinsic &DVI) {
283   auto *N = dyn_cast<MDNode>(DVI.getVariable());
284   if (!N)
285     return;
286 
287   auto *DV = dyn_cast<DILocalVariable>(N);
288   if (!DV)
289     return;
290 
291   if (!NodesSeen.insert(DV).second)
292     return;
293   processScope(DV->getScope());
294   processType(DV->getType());
295 }
296 
297 bool DebugInfoFinder::addType(DIType *DT) {
298   if (!DT)
299     return false;
300 
301   if (!NodesSeen.insert(DT).second)
302     return false;
303 
304   TYs.push_back(const_cast<DIType *>(DT));
305   return true;
306 }
307 
308 bool DebugInfoFinder::addCompileUnit(DICompileUnit *CU) {
309   if (!CU)
310     return false;
311   if (!NodesSeen.insert(CU).second)
312     return false;
313 
314   CUs.push_back(CU);
315   return true;
316 }
317 
318 bool DebugInfoFinder::addGlobalVariable(DIGlobalVariableExpression *DIG) {
319   if (!NodesSeen.insert(DIG).second)
320     return false;
321 
322   GVs.push_back(DIG);
323   return true;
324 }
325 
326 bool DebugInfoFinder::addSubprogram(DISubprogram *SP) {
327   if (!SP)
328     return false;
329 
330   if (!NodesSeen.insert(SP).second)
331     return false;
332 
333   SPs.push_back(SP);
334   return true;
335 }
336 
337 bool DebugInfoFinder::addScope(DIScope *Scope) {
338   if (!Scope)
339     return false;
340   // FIXME: Ocaml binding generates a scope with no content, we treat it
341   // as null for now.
342   if (Scope->getNumOperands() == 0)
343     return false;
344   if (!NodesSeen.insert(Scope).second)
345     return false;
346   Scopes.push_back(Scope);
347   return true;
348 }
349 
350 static MDNode *updateLoopMetadataDebugLocationsImpl(
351     MDNode *OrigLoopID, function_ref<Metadata *(Metadata *)> Updater) {
352   assert(OrigLoopID && OrigLoopID->getNumOperands() > 0 &&
353          "Loop ID needs at least one operand");
354   assert(OrigLoopID && OrigLoopID->getOperand(0).get() == OrigLoopID &&
355          "Loop ID should refer to itself");
356 
357   // Save space for the self-referential LoopID.
358   SmallVector<Metadata *, 4> MDs = {nullptr};
359 
360   for (unsigned i = 1; i < OrigLoopID->getNumOperands(); ++i) {
361     Metadata *MD = OrigLoopID->getOperand(i);
362     if (!MD)
363       MDs.push_back(nullptr);
364     else if (Metadata *NewMD = Updater(MD))
365       MDs.push_back(NewMD);
366   }
367 
368   MDNode *NewLoopID = MDNode::getDistinct(OrigLoopID->getContext(), MDs);
369   // Insert the self-referential LoopID.
370   NewLoopID->replaceOperandWith(0, NewLoopID);
371   return NewLoopID;
372 }
373 
374 void llvm::updateLoopMetadataDebugLocations(
375     Instruction &I, function_ref<Metadata *(Metadata *)> Updater) {
376   MDNode *OrigLoopID = I.getMetadata(LLVMContext::MD_loop);
377   if (!OrigLoopID)
378     return;
379   MDNode *NewLoopID = updateLoopMetadataDebugLocationsImpl(OrigLoopID, Updater);
380   I.setMetadata(LLVMContext::MD_loop, NewLoopID);
381 }
382 
383 /// Return true if a node is a DILocation or if a DILocation is
384 /// indirectly referenced by one of the node's children.
385 static bool isDILocationReachable(SmallPtrSetImpl<Metadata *> &Visited,
386                                   SmallPtrSetImpl<Metadata *> &Reachable,
387                                   Metadata *MD) {
388   MDNode *N = dyn_cast_or_null<MDNode>(MD);
389   if (!N)
390     return false;
391   if (isa<DILocation>(N) || Reachable.count(N))
392     return true;
393   if (!Visited.insert(N).second)
394     return false;
395   for (auto &OpIt : N->operands()) {
396     Metadata *Op = OpIt.get();
397     if (isDILocationReachable(Visited, Reachable, Op)) {
398       Reachable.insert(N);
399       return true;
400     }
401   }
402   return false;
403 }
404 
405 static MDNode *stripDebugLocFromLoopID(MDNode *N) {
406   assert(!N->operands().empty() && "Missing self reference?");
407   SmallPtrSet<Metadata *, 8> Visited, DILocationReachable;
408   // If we already visited N, there is nothing to do.
409   if (!Visited.insert(N).second)
410     return N;
411 
412   // If there is no debug location, we do not have to rewrite this
413   // MDNode. This loop also initializes DILocationReachable, later
414   // needed by updateLoopMetadataDebugLocationsImpl; the use of
415   // count_if avoids an early exit.
416   if (!std::count_if(N->op_begin() + 1, N->op_end(),
417                      [&Visited, &DILocationReachable](const MDOperand &Op) {
418                        return isDILocationReachable(
419                                   Visited, DILocationReachable, Op.get());
420                      }))
421     return N;
422 
423   // If there is only the debug location without any actual loop metadata, we
424   // can remove the metadata.
425   if (std::all_of(
426           N->op_begin() + 1, N->op_end(),
427           [&Visited, &DILocationReachable](const MDOperand &Op) {
428             return isDILocationReachable(Visited, DILocationReachable,
429                                          Op.get());
430           }))
431     return nullptr;
432 
433   return updateLoopMetadataDebugLocationsImpl(
434       N, [&DILocationReachable](Metadata *MD) -> Metadata * {
435         if (isa<DILocation>(MD) || DILocationReachable.count(MD))
436           return nullptr;
437         return MD;
438       });
439 }
440 
441 bool llvm::stripDebugInfo(Function &F) {
442   bool Changed = false;
443   if (F.hasMetadata(LLVMContext::MD_dbg)) {
444     Changed = true;
445     F.setSubprogram(nullptr);
446   }
447 
448   DenseMap<MDNode *, MDNode *> LoopIDsMap;
449   for (BasicBlock &BB : F) {
450     for (auto II = BB.begin(), End = BB.end(); II != End;) {
451       Instruction &I = *II++; // We may delete the instruction, increment now.
452       if (isa<DbgInfoIntrinsic>(&I)) {
453         I.eraseFromParent();
454         Changed = true;
455         continue;
456       }
457       if (I.getDebugLoc()) {
458         Changed = true;
459         I.setDebugLoc(DebugLoc());
460       }
461       if (auto *LoopID = I.getMetadata(LLVMContext::MD_loop)) {
462         auto *NewLoopID = LoopIDsMap.lookup(LoopID);
463         if (!NewLoopID)
464           NewLoopID = LoopIDsMap[LoopID] = stripDebugLocFromLoopID(LoopID);
465         if (NewLoopID != LoopID)
466           I.setMetadata(LLVMContext::MD_loop, NewLoopID);
467       }
468       // Strip heapallocsite attachments, they point into the DIType system.
469       if (I.hasMetadataOtherThanDebugLoc())
470         I.setMetadata("heapallocsite", nullptr);
471     }
472   }
473   return Changed;
474 }
475 
476 bool llvm::StripDebugInfo(Module &M) {
477   bool Changed = false;
478 
479   for (NamedMDNode &NMD : llvm::make_early_inc_range(M.named_metadata())) {
480     // We're stripping debug info, and without them, coverage information
481     // doesn't quite make sense.
482     if (NMD.getName().startswith("llvm.dbg.") ||
483         NMD.getName() == "llvm.gcov") {
484       NMD.eraseFromParent();
485       Changed = true;
486     }
487   }
488 
489   for (Function &F : M)
490     Changed |= stripDebugInfo(F);
491 
492   for (auto &GV : M.globals()) {
493     Changed |= GV.eraseMetadata(LLVMContext::MD_dbg);
494   }
495 
496   if (GVMaterializer *Materializer = M.getMaterializer())
497     Materializer->setStripDebugInfo();
498 
499   return Changed;
500 }
501 
502 namespace {
503 
504 /// Helper class to downgrade -g metadata to -gline-tables-only metadata.
505 class DebugTypeInfoRemoval {
506   DenseMap<Metadata *, Metadata *> Replacements;
507 
508 public:
509   /// The (void)() type.
510   MDNode *EmptySubroutineType;
511 
512 private:
513   /// Remember what linkage name we originally had before stripping. If we end
514   /// up making two subprograms identical who originally had different linkage
515   /// names, then we need to make one of them distinct, to avoid them getting
516   /// uniqued. Maps the new node to the old linkage name.
517   DenseMap<DISubprogram *, StringRef> NewToLinkageName;
518 
519   // TODO: Remember the distinct subprogram we created for a given linkage name,
520   // so that we can continue to unique whenever possible. Map <newly created
521   // node, old linkage name> to the first (possibly distinct) mdsubprogram
522   // created for that combination. This is not strictly needed for correctness,
523   // but can cut down on the number of MDNodes and let us diff cleanly with the
524   // output of -gline-tables-only.
525 
526 public:
527   DebugTypeInfoRemoval(LLVMContext &C)
528       : EmptySubroutineType(DISubroutineType::get(C, DINode::FlagZero, 0,
529                                                   MDNode::get(C, {}))) {}
530 
531   Metadata *map(Metadata *M) {
532     if (!M)
533       return nullptr;
534     auto Replacement = Replacements.find(M);
535     if (Replacement != Replacements.end())
536       return Replacement->second;
537 
538     return M;
539   }
540   MDNode *mapNode(Metadata *N) { return dyn_cast_or_null<MDNode>(map(N)); }
541 
542   /// Recursively remap N and all its referenced children. Does a DF post-order
543   /// traversal, so as to remap bottoms up.
544   void traverseAndRemap(MDNode *N) { traverse(N); }
545 
546 private:
547   // Create a new DISubprogram, to replace the one given.
548   DISubprogram *getReplacementSubprogram(DISubprogram *MDS) {
549     auto *FileAndScope = cast_or_null<DIFile>(map(MDS->getFile()));
550     StringRef LinkageName = MDS->getName().empty() ? MDS->getLinkageName() : "";
551     DISubprogram *Declaration = nullptr;
552     auto *Type = cast_or_null<DISubroutineType>(map(MDS->getType()));
553     DIType *ContainingType =
554         cast_or_null<DIType>(map(MDS->getContainingType()));
555     auto *Unit = cast_or_null<DICompileUnit>(map(MDS->getUnit()));
556     auto Variables = nullptr;
557     auto TemplateParams = nullptr;
558 
559     // Make a distinct DISubprogram, for situations that warrent it.
560     auto distinctMDSubprogram = [&]() {
561       return DISubprogram::getDistinct(
562           MDS->getContext(), FileAndScope, MDS->getName(), LinkageName,
563           FileAndScope, MDS->getLine(), Type, MDS->getScopeLine(),
564           ContainingType, MDS->getVirtualIndex(), MDS->getThisAdjustment(),
565           MDS->getFlags(), MDS->getSPFlags(), Unit, TemplateParams, Declaration,
566           Variables);
567     };
568 
569     if (MDS->isDistinct())
570       return distinctMDSubprogram();
571 
572     auto *NewMDS = DISubprogram::get(
573         MDS->getContext(), FileAndScope, MDS->getName(), LinkageName,
574         FileAndScope, MDS->getLine(), Type, MDS->getScopeLine(), ContainingType,
575         MDS->getVirtualIndex(), MDS->getThisAdjustment(), MDS->getFlags(),
576         MDS->getSPFlags(), Unit, TemplateParams, Declaration, Variables);
577 
578     StringRef OldLinkageName = MDS->getLinkageName();
579 
580     // See if we need to make a distinct one.
581     auto OrigLinkage = NewToLinkageName.find(NewMDS);
582     if (OrigLinkage != NewToLinkageName.end()) {
583       if (OrigLinkage->second == OldLinkageName)
584         // We're good.
585         return NewMDS;
586 
587       // Otherwise, need to make a distinct one.
588       // TODO: Query the map to see if we already have one.
589       return distinctMDSubprogram();
590     }
591 
592     NewToLinkageName.insert({NewMDS, MDS->getLinkageName()});
593     return NewMDS;
594   }
595 
596   /// Create a new compile unit, to replace the one given
597   DICompileUnit *getReplacementCU(DICompileUnit *CU) {
598     // Drop skeleton CUs.
599     if (CU->getDWOId())
600       return nullptr;
601 
602     auto *File = cast_or_null<DIFile>(map(CU->getFile()));
603     MDTuple *EnumTypes = nullptr;
604     MDTuple *RetainedTypes = nullptr;
605     MDTuple *GlobalVariables = nullptr;
606     MDTuple *ImportedEntities = nullptr;
607     return DICompileUnit::getDistinct(
608         CU->getContext(), CU->getSourceLanguage(), File, CU->getProducer(),
609         CU->isOptimized(), CU->getFlags(), CU->getRuntimeVersion(),
610         CU->getSplitDebugFilename(), DICompileUnit::LineTablesOnly, EnumTypes,
611         RetainedTypes, GlobalVariables, ImportedEntities, CU->getMacros(),
612         CU->getDWOId(), CU->getSplitDebugInlining(),
613         CU->getDebugInfoForProfiling(), CU->getNameTableKind(),
614         CU->getRangesBaseAddress(), CU->getSysRoot(), CU->getSDK());
615   }
616 
617   DILocation *getReplacementMDLocation(DILocation *MLD) {
618     auto *Scope = map(MLD->getScope());
619     auto *InlinedAt = map(MLD->getInlinedAt());
620     if (MLD->isDistinct())
621       return DILocation::getDistinct(MLD->getContext(), MLD->getLine(),
622                                      MLD->getColumn(), Scope, InlinedAt);
623     return DILocation::get(MLD->getContext(), MLD->getLine(), MLD->getColumn(),
624                            Scope, InlinedAt);
625   }
626 
627   /// Create a new generic MDNode, to replace the one given
628   MDNode *getReplacementMDNode(MDNode *N) {
629     SmallVector<Metadata *, 8> Ops;
630     Ops.reserve(N->getNumOperands());
631     for (auto &I : N->operands())
632       if (I)
633         Ops.push_back(map(I));
634     auto *Ret = MDNode::get(N->getContext(), Ops);
635     return Ret;
636   }
637 
638   /// Attempt to re-map N to a newly created node.
639   void remap(MDNode *N) {
640     if (Replacements.count(N))
641       return;
642 
643     auto doRemap = [&](MDNode *N) -> MDNode * {
644       if (!N)
645         return nullptr;
646       if (auto *MDSub = dyn_cast<DISubprogram>(N)) {
647         remap(MDSub->getUnit());
648         return getReplacementSubprogram(MDSub);
649       }
650       if (isa<DISubroutineType>(N))
651         return EmptySubroutineType;
652       if (auto *CU = dyn_cast<DICompileUnit>(N))
653         return getReplacementCU(CU);
654       if (isa<DIFile>(N))
655         return N;
656       if (auto *MDLB = dyn_cast<DILexicalBlockBase>(N))
657         // Remap to our referenced scope (recursively).
658         return mapNode(MDLB->getScope());
659       if (auto *MLD = dyn_cast<DILocation>(N))
660         return getReplacementMDLocation(MLD);
661 
662       // Otherwise, if we see these, just drop them now. Not strictly necessary,
663       // but this speeds things up a little.
664       if (isa<DINode>(N))
665         return nullptr;
666 
667       return getReplacementMDNode(N);
668     };
669     Replacements[N] = doRemap(N);
670   }
671 
672   /// Do the remapping traversal.
673   void traverse(MDNode *);
674 };
675 
676 } // end anonymous namespace
677 
678 void DebugTypeInfoRemoval::traverse(MDNode *N) {
679   if (!N || Replacements.count(N))
680     return;
681 
682   // To avoid cycles, as well as for efficiency sake, we will sometimes prune
683   // parts of the graph.
684   auto prune = [](MDNode *Parent, MDNode *Child) {
685     if (auto *MDS = dyn_cast<DISubprogram>(Parent))
686       return Child == MDS->getRetainedNodes().get();
687     return false;
688   };
689 
690   SmallVector<MDNode *, 16> ToVisit;
691   DenseSet<MDNode *> Opened;
692 
693   // Visit each node starting at N in post order, and map them.
694   ToVisit.push_back(N);
695   while (!ToVisit.empty()) {
696     auto *N = ToVisit.back();
697     if (!Opened.insert(N).second) {
698       // Close it.
699       remap(N);
700       ToVisit.pop_back();
701       continue;
702     }
703     for (auto &I : N->operands())
704       if (auto *MDN = dyn_cast_or_null<MDNode>(I))
705         if (!Opened.count(MDN) && !Replacements.count(MDN) && !prune(N, MDN) &&
706             !isa<DICompileUnit>(MDN))
707           ToVisit.push_back(MDN);
708   }
709 }
710 
711 bool llvm::stripNonLineTableDebugInfo(Module &M) {
712   bool Changed = false;
713 
714   // First off, delete the debug intrinsics.
715   auto RemoveUses = [&](StringRef Name) {
716     if (auto *DbgVal = M.getFunction(Name)) {
717       while (!DbgVal->use_empty())
718         cast<Instruction>(DbgVal->user_back())->eraseFromParent();
719       DbgVal->eraseFromParent();
720       Changed = true;
721     }
722   };
723   RemoveUses("llvm.dbg.addr");
724   RemoveUses("llvm.dbg.declare");
725   RemoveUses("llvm.dbg.label");
726   RemoveUses("llvm.dbg.value");
727 
728   // Delete non-CU debug info named metadata nodes.
729   for (auto NMI = M.named_metadata_begin(), NME = M.named_metadata_end();
730        NMI != NME;) {
731     NamedMDNode *NMD = &*NMI;
732     ++NMI;
733     // Specifically keep dbg.cu around.
734     if (NMD->getName() == "llvm.dbg.cu")
735       continue;
736   }
737 
738   // Drop all dbg attachments from global variables.
739   for (auto &GV : M.globals())
740     GV.eraseMetadata(LLVMContext::MD_dbg);
741 
742   DebugTypeInfoRemoval Mapper(M.getContext());
743   auto remap = [&](MDNode *Node) -> MDNode * {
744     if (!Node)
745       return nullptr;
746     Mapper.traverseAndRemap(Node);
747     auto *NewNode = Mapper.mapNode(Node);
748     Changed |= Node != NewNode;
749     Node = NewNode;
750     return NewNode;
751   };
752 
753   // Rewrite the DebugLocs to be equivalent to what
754   // -gline-tables-only would have created.
755   for (auto &F : M) {
756     if (auto *SP = F.getSubprogram()) {
757       Mapper.traverseAndRemap(SP);
758       auto *NewSP = cast<DISubprogram>(Mapper.mapNode(SP));
759       Changed |= SP != NewSP;
760       F.setSubprogram(NewSP);
761     }
762     for (auto &BB : F) {
763       for (auto &I : BB) {
764         auto remapDebugLoc = [&](const DebugLoc &DL) -> DebugLoc {
765           auto *Scope = DL.getScope();
766           MDNode *InlinedAt = DL.getInlinedAt();
767           Scope = remap(Scope);
768           InlinedAt = remap(InlinedAt);
769           return DILocation::get(M.getContext(), DL.getLine(), DL.getCol(),
770                                  Scope, InlinedAt);
771         };
772 
773         if (I.getDebugLoc() != DebugLoc())
774           I.setDebugLoc(remapDebugLoc(I.getDebugLoc()));
775 
776         // Remap DILocations in llvm.loop attachments.
777         updateLoopMetadataDebugLocations(I, [&](Metadata *MD) -> Metadata * {
778           if (auto *Loc = dyn_cast_or_null<DILocation>(MD))
779             return remapDebugLoc(Loc).get();
780           return MD;
781         });
782 
783         // Strip heapallocsite attachments, they point into the DIType system.
784         if (I.hasMetadataOtherThanDebugLoc())
785           I.setMetadata("heapallocsite", nullptr);
786       }
787     }
788   }
789 
790   // Create a new llvm.dbg.cu, which is equivalent to the one
791   // -gline-tables-only would have created.
792   for (auto &NMD : M.getNamedMDList()) {
793     SmallVector<MDNode *, 8> Ops;
794     for (MDNode *Op : NMD.operands())
795       Ops.push_back(remap(Op));
796 
797     if (!Changed)
798       continue;
799 
800     NMD.clearOperands();
801     for (auto *Op : Ops)
802       if (Op)
803         NMD.addOperand(Op);
804   }
805   return Changed;
806 }
807 
808 unsigned llvm::getDebugMetadataVersionFromModule(const Module &M) {
809   if (auto *Val = mdconst::dyn_extract_or_null<ConstantInt>(
810           M.getModuleFlag("Debug Info Version")))
811     return Val->getZExtValue();
812   return 0;
813 }
814 
815 void Instruction::applyMergedLocation(const DILocation *LocA,
816                                       const DILocation *LocB) {
817   setDebugLoc(DILocation::getMergedLocation(LocA, LocB));
818 }
819 
820 void Instruction::updateLocationAfterHoist() { dropLocation(); }
821 
822 void Instruction::dropLocation() {
823   const DebugLoc &DL = getDebugLoc();
824   if (!DL)
825     return;
826 
827   // If this isn't a call, drop the location to allow a location from a
828   // preceding instruction to propagate.
829   if (!isa<CallBase>(this)) {
830     setDebugLoc(DebugLoc());
831     return;
832   }
833 
834   // Set a line 0 location for calls to preserve scope information in case
835   // inlining occurs.
836   DISubprogram *SP = getFunction()->getSubprogram();
837   if (SP)
838     // If a function scope is available, set it on the line 0 location. When
839     // hoisting a call to a predecessor block, using the function scope avoids
840     // making it look like the callee was reached earlier than it should be.
841     setDebugLoc(DILocation::get(getContext(), 0, 0, SP));
842   else
843     // The parent function has no scope. Go ahead and drop the location. If
844     // the parent function is inlined, and the callee has a subprogram, the
845     // inliner will attach a location to the call.
846     //
847     // One alternative is to set a line 0 location with the existing scope and
848     // inlinedAt info. The location might be sensitive to when inlining occurs.
849     setDebugLoc(DebugLoc());
850 }
851 
852 //===----------------------------------------------------------------------===//
853 // LLVM C API implementations.
854 //===----------------------------------------------------------------------===//
855 
856 static unsigned map_from_llvmDWARFsourcelanguage(LLVMDWARFSourceLanguage lang) {
857   switch (lang) {
858 #define HANDLE_DW_LANG(ID, NAME, LOWER_BOUND, VERSION, VENDOR)                 \
859   case LLVMDWARFSourceLanguage##NAME:                                          \
860     return ID;
861 #include "llvm/BinaryFormat/Dwarf.def"
862 #undef HANDLE_DW_LANG
863   }
864   llvm_unreachable("Unhandled Tag");
865 }
866 
867 template <typename DIT> DIT *unwrapDI(LLVMMetadataRef Ref) {
868   return (DIT *)(Ref ? unwrap<MDNode>(Ref) : nullptr);
869 }
870 
871 static DINode::DIFlags map_from_llvmDIFlags(LLVMDIFlags Flags) {
872   return static_cast<DINode::DIFlags>(Flags);
873 }
874 
875 static LLVMDIFlags map_to_llvmDIFlags(DINode::DIFlags Flags) {
876   return static_cast<LLVMDIFlags>(Flags);
877 }
878 
879 static DISubprogram::DISPFlags
880 pack_into_DISPFlags(bool IsLocalToUnit, bool IsDefinition, bool IsOptimized) {
881   return DISubprogram::toSPFlags(IsLocalToUnit, IsDefinition, IsOptimized);
882 }
883 
884 unsigned LLVMDebugMetadataVersion() {
885   return DEBUG_METADATA_VERSION;
886 }
887 
888 LLVMDIBuilderRef LLVMCreateDIBuilderDisallowUnresolved(LLVMModuleRef M) {
889   return wrap(new DIBuilder(*unwrap(M), false));
890 }
891 
892 LLVMDIBuilderRef LLVMCreateDIBuilder(LLVMModuleRef M) {
893   return wrap(new DIBuilder(*unwrap(M)));
894 }
895 
896 unsigned LLVMGetModuleDebugMetadataVersion(LLVMModuleRef M) {
897   return getDebugMetadataVersionFromModule(*unwrap(M));
898 }
899 
900 LLVMBool LLVMStripModuleDebugInfo(LLVMModuleRef M) {
901   return StripDebugInfo(*unwrap(M));
902 }
903 
904 void LLVMDisposeDIBuilder(LLVMDIBuilderRef Builder) {
905   delete unwrap(Builder);
906 }
907 
908 void LLVMDIBuilderFinalize(LLVMDIBuilderRef Builder) {
909   unwrap(Builder)->finalize();
910 }
911 
912 void LLVMDIBuilderFinalizeSubprogram(LLVMDIBuilderRef Builder,
913                                      LLVMMetadataRef subprogram) {
914   unwrap(Builder)->finalizeSubprogram(unwrapDI<DISubprogram>(subprogram));
915 }
916 
917 LLVMMetadataRef LLVMDIBuilderCreateCompileUnit(
918     LLVMDIBuilderRef Builder, LLVMDWARFSourceLanguage Lang,
919     LLVMMetadataRef FileRef, const char *Producer, size_t ProducerLen,
920     LLVMBool isOptimized, const char *Flags, size_t FlagsLen,
921     unsigned RuntimeVer, const char *SplitName, size_t SplitNameLen,
922     LLVMDWARFEmissionKind Kind, unsigned DWOId, LLVMBool SplitDebugInlining,
923     LLVMBool DebugInfoForProfiling, const char *SysRoot, size_t SysRootLen,
924     const char *SDK, size_t SDKLen) {
925   auto File = unwrapDI<DIFile>(FileRef);
926 
927   return wrap(unwrap(Builder)->createCompileUnit(
928       map_from_llvmDWARFsourcelanguage(Lang), File,
929       StringRef(Producer, ProducerLen), isOptimized, StringRef(Flags, FlagsLen),
930       RuntimeVer, StringRef(SplitName, SplitNameLen),
931       static_cast<DICompileUnit::DebugEmissionKind>(Kind), DWOId,
932       SplitDebugInlining, DebugInfoForProfiling,
933       DICompileUnit::DebugNameTableKind::Default, false,
934       StringRef(SysRoot, SysRootLen), StringRef(SDK, SDKLen)));
935 }
936 
937 LLVMMetadataRef
938 LLVMDIBuilderCreateFile(LLVMDIBuilderRef Builder, const char *Filename,
939                         size_t FilenameLen, const char *Directory,
940                         size_t DirectoryLen) {
941   return wrap(unwrap(Builder)->createFile(StringRef(Filename, FilenameLen),
942                                           StringRef(Directory, DirectoryLen)));
943 }
944 
945 LLVMMetadataRef
946 LLVMDIBuilderCreateModule(LLVMDIBuilderRef Builder, LLVMMetadataRef ParentScope,
947                           const char *Name, size_t NameLen,
948                           const char *ConfigMacros, size_t ConfigMacrosLen,
949                           const char *IncludePath, size_t IncludePathLen,
950                           const char *APINotesFile, size_t APINotesFileLen) {
951   return wrap(unwrap(Builder)->createModule(
952       unwrapDI<DIScope>(ParentScope), StringRef(Name, NameLen),
953       StringRef(ConfigMacros, ConfigMacrosLen),
954       StringRef(IncludePath, IncludePathLen),
955       StringRef(APINotesFile, APINotesFileLen)));
956 }
957 
958 LLVMMetadataRef LLVMDIBuilderCreateNameSpace(LLVMDIBuilderRef Builder,
959                                              LLVMMetadataRef ParentScope,
960                                              const char *Name, size_t NameLen,
961                                              LLVMBool ExportSymbols) {
962   return wrap(unwrap(Builder)->createNameSpace(
963       unwrapDI<DIScope>(ParentScope), StringRef(Name, NameLen), ExportSymbols));
964 }
965 
966 LLVMMetadataRef LLVMDIBuilderCreateFunction(
967     LLVMDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
968     size_t NameLen, const char *LinkageName, size_t LinkageNameLen,
969     LLVMMetadataRef File, unsigned LineNo, LLVMMetadataRef Ty,
970     LLVMBool IsLocalToUnit, LLVMBool IsDefinition,
971     unsigned ScopeLine, LLVMDIFlags Flags, LLVMBool IsOptimized) {
972   return wrap(unwrap(Builder)->createFunction(
973       unwrapDI<DIScope>(Scope), {Name, NameLen}, {LinkageName, LinkageNameLen},
974       unwrapDI<DIFile>(File), LineNo, unwrapDI<DISubroutineType>(Ty), ScopeLine,
975       map_from_llvmDIFlags(Flags),
976       pack_into_DISPFlags(IsLocalToUnit, IsDefinition, IsOptimized), nullptr,
977       nullptr, nullptr));
978 }
979 
980 
981 LLVMMetadataRef LLVMDIBuilderCreateLexicalBlock(
982     LLVMDIBuilderRef Builder, LLVMMetadataRef Scope,
983     LLVMMetadataRef File, unsigned Line, unsigned Col) {
984   return wrap(unwrap(Builder)->createLexicalBlock(unwrapDI<DIScope>(Scope),
985                                                   unwrapDI<DIFile>(File),
986                                                   Line, Col));
987 }
988 
989 LLVMMetadataRef
990 LLVMDIBuilderCreateLexicalBlockFile(LLVMDIBuilderRef Builder,
991                                     LLVMMetadataRef Scope,
992                                     LLVMMetadataRef File,
993                                     unsigned Discriminator) {
994   return wrap(unwrap(Builder)->createLexicalBlockFile(unwrapDI<DIScope>(Scope),
995                                                       unwrapDI<DIFile>(File),
996                                                       Discriminator));
997 }
998 
999 LLVMMetadataRef
1000 LLVMDIBuilderCreateImportedModuleFromNamespace(LLVMDIBuilderRef Builder,
1001                                                LLVMMetadataRef Scope,
1002                                                LLVMMetadataRef NS,
1003                                                LLVMMetadataRef File,
1004                                                unsigned Line) {
1005   return wrap(unwrap(Builder)->createImportedModule(unwrapDI<DIScope>(Scope),
1006                                                     unwrapDI<DINamespace>(NS),
1007                                                     unwrapDI<DIFile>(File),
1008                                                     Line));
1009 }
1010 
1011 LLVMMetadataRef LLVMDIBuilderCreateImportedModuleFromAlias(
1012     LLVMDIBuilderRef Builder, LLVMMetadataRef Scope,
1013     LLVMMetadataRef ImportedEntity, LLVMMetadataRef File, unsigned Line,
1014     LLVMMetadataRef *Elements, unsigned NumElements) {
1015   auto Elts =
1016       (NumElements > 0)
1017           ? unwrap(Builder)->getOrCreateArray({unwrap(Elements), NumElements})
1018           : nullptr;
1019   return wrap(unwrap(Builder)->createImportedModule(
1020       unwrapDI<DIScope>(Scope), unwrapDI<DIImportedEntity>(ImportedEntity),
1021       unwrapDI<DIFile>(File), Line, Elts));
1022 }
1023 
1024 LLVMMetadataRef LLVMDIBuilderCreateImportedModuleFromModule(
1025     LLVMDIBuilderRef Builder, LLVMMetadataRef Scope, LLVMMetadataRef M,
1026     LLVMMetadataRef File, unsigned Line, LLVMMetadataRef *Elements,
1027     unsigned NumElements) {
1028   auto Elts =
1029       (NumElements > 0)
1030           ? unwrap(Builder)->getOrCreateArray({unwrap(Elements), NumElements})
1031           : nullptr;
1032   return wrap(unwrap(Builder)->createImportedModule(
1033       unwrapDI<DIScope>(Scope), unwrapDI<DIModule>(M), unwrapDI<DIFile>(File),
1034       Line, Elts));
1035 }
1036 
1037 LLVMMetadataRef LLVMDIBuilderCreateImportedDeclaration(
1038     LLVMDIBuilderRef Builder, LLVMMetadataRef Scope, LLVMMetadataRef Decl,
1039     LLVMMetadataRef File, unsigned Line, const char *Name, size_t NameLen,
1040     LLVMMetadataRef *Elements, unsigned NumElements) {
1041   auto Elts =
1042       (NumElements > 0)
1043           ? unwrap(Builder)->getOrCreateArray({unwrap(Elements), NumElements})
1044           : nullptr;
1045   return wrap(unwrap(Builder)->createImportedDeclaration(
1046       unwrapDI<DIScope>(Scope), unwrapDI<DINode>(Decl), unwrapDI<DIFile>(File),
1047       Line, {Name, NameLen}, Elts));
1048 }
1049 
1050 LLVMMetadataRef
1051 LLVMDIBuilderCreateDebugLocation(LLVMContextRef Ctx, unsigned Line,
1052                                  unsigned Column, LLVMMetadataRef Scope,
1053                                  LLVMMetadataRef InlinedAt) {
1054   return wrap(DILocation::get(*unwrap(Ctx), Line, Column, unwrap(Scope),
1055                               unwrap(InlinedAt)));
1056 }
1057 
1058 unsigned LLVMDILocationGetLine(LLVMMetadataRef Location) {
1059   return unwrapDI<DILocation>(Location)->getLine();
1060 }
1061 
1062 unsigned LLVMDILocationGetColumn(LLVMMetadataRef Location) {
1063   return unwrapDI<DILocation>(Location)->getColumn();
1064 }
1065 
1066 LLVMMetadataRef LLVMDILocationGetScope(LLVMMetadataRef Location) {
1067   return wrap(unwrapDI<DILocation>(Location)->getScope());
1068 }
1069 
1070 LLVMMetadataRef LLVMDILocationGetInlinedAt(LLVMMetadataRef Location) {
1071   return wrap(unwrapDI<DILocation>(Location)->getInlinedAt());
1072 }
1073 
1074 LLVMMetadataRef LLVMDIScopeGetFile(LLVMMetadataRef Scope) {
1075   return wrap(unwrapDI<DIScope>(Scope)->getFile());
1076 }
1077 
1078 const char *LLVMDIFileGetDirectory(LLVMMetadataRef File, unsigned *Len) {
1079   auto Dir = unwrapDI<DIFile>(File)->getDirectory();
1080   *Len = Dir.size();
1081   return Dir.data();
1082 }
1083 
1084 const char *LLVMDIFileGetFilename(LLVMMetadataRef File, unsigned *Len) {
1085   auto Name = unwrapDI<DIFile>(File)->getFilename();
1086   *Len = Name.size();
1087   return Name.data();
1088 }
1089 
1090 const char *LLVMDIFileGetSource(LLVMMetadataRef File, unsigned *Len) {
1091   if (auto Src = unwrapDI<DIFile>(File)->getSource()) {
1092     *Len = Src->size();
1093     return Src->data();
1094   }
1095   *Len = 0;
1096   return "";
1097 }
1098 
1099 LLVMMetadataRef LLVMDIBuilderCreateMacro(LLVMDIBuilderRef Builder,
1100                                          LLVMMetadataRef ParentMacroFile,
1101                                          unsigned Line,
1102                                          LLVMDWARFMacinfoRecordType RecordType,
1103                                          const char *Name, size_t NameLen,
1104                                          const char *Value, size_t ValueLen) {
1105   return wrap(
1106       unwrap(Builder)->createMacro(unwrapDI<DIMacroFile>(ParentMacroFile), Line,
1107                                    static_cast<MacinfoRecordType>(RecordType),
1108                                    {Name, NameLen}, {Value, ValueLen}));
1109 }
1110 
1111 LLVMMetadataRef
1112 LLVMDIBuilderCreateTempMacroFile(LLVMDIBuilderRef Builder,
1113                                  LLVMMetadataRef ParentMacroFile, unsigned Line,
1114                                  LLVMMetadataRef File) {
1115   return wrap(unwrap(Builder)->createTempMacroFile(
1116       unwrapDI<DIMacroFile>(ParentMacroFile), Line, unwrapDI<DIFile>(File)));
1117 }
1118 
1119 LLVMMetadataRef LLVMDIBuilderCreateEnumerator(LLVMDIBuilderRef Builder,
1120                                               const char *Name, size_t NameLen,
1121                                               int64_t Value,
1122                                               LLVMBool IsUnsigned) {
1123   return wrap(unwrap(Builder)->createEnumerator({Name, NameLen}, Value,
1124                                                 IsUnsigned != 0));
1125 }
1126 
1127 LLVMMetadataRef LLVMDIBuilderCreateEnumerationType(
1128   LLVMDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
1129   size_t NameLen, LLVMMetadataRef File, unsigned LineNumber,
1130   uint64_t SizeInBits, uint32_t AlignInBits, LLVMMetadataRef *Elements,
1131   unsigned NumElements, LLVMMetadataRef ClassTy) {
1132 auto Elts = unwrap(Builder)->getOrCreateArray({unwrap(Elements),
1133                                                NumElements});
1134 return wrap(unwrap(Builder)->createEnumerationType(
1135     unwrapDI<DIScope>(Scope), {Name, NameLen}, unwrapDI<DIFile>(File),
1136     LineNumber, SizeInBits, AlignInBits, Elts, unwrapDI<DIType>(ClassTy)));
1137 }
1138 
1139 LLVMMetadataRef LLVMDIBuilderCreateUnionType(
1140   LLVMDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
1141   size_t NameLen, LLVMMetadataRef File, unsigned LineNumber,
1142   uint64_t SizeInBits, uint32_t AlignInBits, LLVMDIFlags Flags,
1143   LLVMMetadataRef *Elements, unsigned NumElements, unsigned RunTimeLang,
1144   const char *UniqueId, size_t UniqueIdLen) {
1145   auto Elts = unwrap(Builder)->getOrCreateArray({unwrap(Elements),
1146                                                  NumElements});
1147   return wrap(unwrap(Builder)->createUnionType(
1148      unwrapDI<DIScope>(Scope), {Name, NameLen}, unwrapDI<DIFile>(File),
1149      LineNumber, SizeInBits, AlignInBits, map_from_llvmDIFlags(Flags),
1150      Elts, RunTimeLang, {UniqueId, UniqueIdLen}));
1151 }
1152 
1153 
1154 LLVMMetadataRef
1155 LLVMDIBuilderCreateArrayType(LLVMDIBuilderRef Builder, uint64_t Size,
1156                              uint32_t AlignInBits, LLVMMetadataRef Ty,
1157                              LLVMMetadataRef *Subscripts,
1158                              unsigned NumSubscripts) {
1159   auto Subs = unwrap(Builder)->getOrCreateArray({unwrap(Subscripts),
1160                                                  NumSubscripts});
1161   return wrap(unwrap(Builder)->createArrayType(Size, AlignInBits,
1162                                                unwrapDI<DIType>(Ty), Subs));
1163 }
1164 
1165 LLVMMetadataRef
1166 LLVMDIBuilderCreateVectorType(LLVMDIBuilderRef Builder, uint64_t Size,
1167                               uint32_t AlignInBits, LLVMMetadataRef Ty,
1168                               LLVMMetadataRef *Subscripts,
1169                               unsigned NumSubscripts) {
1170   auto Subs = unwrap(Builder)->getOrCreateArray({unwrap(Subscripts),
1171                                                  NumSubscripts});
1172   return wrap(unwrap(Builder)->createVectorType(Size, AlignInBits,
1173                                                 unwrapDI<DIType>(Ty), Subs));
1174 }
1175 
1176 LLVMMetadataRef
1177 LLVMDIBuilderCreateBasicType(LLVMDIBuilderRef Builder, const char *Name,
1178                              size_t NameLen, uint64_t SizeInBits,
1179                              LLVMDWARFTypeEncoding Encoding,
1180                              LLVMDIFlags Flags) {
1181   return wrap(unwrap(Builder)->createBasicType({Name, NameLen},
1182                                                SizeInBits, Encoding,
1183                                                map_from_llvmDIFlags(Flags)));
1184 }
1185 
1186 LLVMMetadataRef LLVMDIBuilderCreatePointerType(
1187     LLVMDIBuilderRef Builder, LLVMMetadataRef PointeeTy,
1188     uint64_t SizeInBits, uint32_t AlignInBits, unsigned AddressSpace,
1189     const char *Name, size_t NameLen) {
1190   return wrap(unwrap(Builder)->createPointerType(unwrapDI<DIType>(PointeeTy),
1191                                          SizeInBits, AlignInBits,
1192                                          AddressSpace, {Name, NameLen}));
1193 }
1194 
1195 LLVMMetadataRef LLVMDIBuilderCreateStructType(
1196     LLVMDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
1197     size_t NameLen, LLVMMetadataRef File, unsigned LineNumber,
1198     uint64_t SizeInBits, uint32_t AlignInBits, LLVMDIFlags Flags,
1199     LLVMMetadataRef DerivedFrom, LLVMMetadataRef *Elements,
1200     unsigned NumElements, unsigned RunTimeLang, LLVMMetadataRef VTableHolder,
1201     const char *UniqueId, size_t UniqueIdLen) {
1202   auto Elts = unwrap(Builder)->getOrCreateArray({unwrap(Elements),
1203                                                  NumElements});
1204   return wrap(unwrap(Builder)->createStructType(
1205       unwrapDI<DIScope>(Scope), {Name, NameLen}, unwrapDI<DIFile>(File),
1206       LineNumber, SizeInBits, AlignInBits, map_from_llvmDIFlags(Flags),
1207       unwrapDI<DIType>(DerivedFrom), Elts, RunTimeLang,
1208       unwrapDI<DIType>(VTableHolder), {UniqueId, UniqueIdLen}));
1209 }
1210 
1211 LLVMMetadataRef LLVMDIBuilderCreateMemberType(
1212     LLVMDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
1213     size_t NameLen, LLVMMetadataRef File, unsigned LineNo, uint64_t SizeInBits,
1214     uint32_t AlignInBits, uint64_t OffsetInBits, LLVMDIFlags Flags,
1215     LLVMMetadataRef Ty) {
1216   return wrap(unwrap(Builder)->createMemberType(unwrapDI<DIScope>(Scope),
1217       {Name, NameLen}, unwrapDI<DIFile>(File), LineNo, SizeInBits, AlignInBits,
1218       OffsetInBits, map_from_llvmDIFlags(Flags), unwrapDI<DIType>(Ty)));
1219 }
1220 
1221 LLVMMetadataRef
1222 LLVMDIBuilderCreateUnspecifiedType(LLVMDIBuilderRef Builder, const char *Name,
1223                                    size_t NameLen) {
1224   return wrap(unwrap(Builder)->createUnspecifiedType({Name, NameLen}));
1225 }
1226 
1227 LLVMMetadataRef
1228 LLVMDIBuilderCreateStaticMemberType(
1229     LLVMDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
1230     size_t NameLen, LLVMMetadataRef File, unsigned LineNumber,
1231     LLVMMetadataRef Type, LLVMDIFlags Flags, LLVMValueRef ConstantVal,
1232     uint32_t AlignInBits) {
1233   return wrap(unwrap(Builder)->createStaticMemberType(
1234                   unwrapDI<DIScope>(Scope), {Name, NameLen},
1235                   unwrapDI<DIFile>(File), LineNumber, unwrapDI<DIType>(Type),
1236                   map_from_llvmDIFlags(Flags), unwrap<Constant>(ConstantVal),
1237                   AlignInBits));
1238 }
1239 
1240 LLVMMetadataRef
1241 LLVMDIBuilderCreateObjCIVar(LLVMDIBuilderRef Builder,
1242                             const char *Name, size_t NameLen,
1243                             LLVMMetadataRef File, unsigned LineNo,
1244                             uint64_t SizeInBits, uint32_t AlignInBits,
1245                             uint64_t OffsetInBits, LLVMDIFlags Flags,
1246                             LLVMMetadataRef Ty, LLVMMetadataRef PropertyNode) {
1247   return wrap(unwrap(Builder)->createObjCIVar(
1248                   {Name, NameLen}, unwrapDI<DIFile>(File), LineNo,
1249                   SizeInBits, AlignInBits, OffsetInBits,
1250                   map_from_llvmDIFlags(Flags), unwrapDI<DIType>(Ty),
1251                   unwrapDI<MDNode>(PropertyNode)));
1252 }
1253 
1254 LLVMMetadataRef
1255 LLVMDIBuilderCreateObjCProperty(LLVMDIBuilderRef Builder,
1256                                 const char *Name, size_t NameLen,
1257                                 LLVMMetadataRef File, unsigned LineNo,
1258                                 const char *GetterName, size_t GetterNameLen,
1259                                 const char *SetterName, size_t SetterNameLen,
1260                                 unsigned PropertyAttributes,
1261                                 LLVMMetadataRef Ty) {
1262   return wrap(unwrap(Builder)->createObjCProperty(
1263                   {Name, NameLen}, unwrapDI<DIFile>(File), LineNo,
1264                   {GetterName, GetterNameLen}, {SetterName, SetterNameLen},
1265                   PropertyAttributes, unwrapDI<DIType>(Ty)));
1266 }
1267 
1268 LLVMMetadataRef
1269 LLVMDIBuilderCreateObjectPointerType(LLVMDIBuilderRef Builder,
1270                                      LLVMMetadataRef Type) {
1271   return wrap(unwrap(Builder)->createObjectPointerType(unwrapDI<DIType>(Type)));
1272 }
1273 
1274 LLVMMetadataRef
1275 LLVMDIBuilderCreateTypedef(LLVMDIBuilderRef Builder, LLVMMetadataRef Type,
1276                            const char *Name, size_t NameLen,
1277                            LLVMMetadataRef File, unsigned LineNo,
1278                            LLVMMetadataRef Scope, uint32_t AlignInBits) {
1279   return wrap(unwrap(Builder)->createTypedef(
1280       unwrapDI<DIType>(Type), {Name, NameLen}, unwrapDI<DIFile>(File), LineNo,
1281       unwrapDI<DIScope>(Scope), AlignInBits));
1282 }
1283 
1284 LLVMMetadataRef
1285 LLVMDIBuilderCreateInheritance(LLVMDIBuilderRef Builder,
1286                                LLVMMetadataRef Ty, LLVMMetadataRef BaseTy,
1287                                uint64_t BaseOffset, uint32_t VBPtrOffset,
1288                                LLVMDIFlags Flags) {
1289   return wrap(unwrap(Builder)->createInheritance(
1290                   unwrapDI<DIType>(Ty), unwrapDI<DIType>(BaseTy),
1291                   BaseOffset, VBPtrOffset, map_from_llvmDIFlags(Flags)));
1292 }
1293 
1294 LLVMMetadataRef
1295 LLVMDIBuilderCreateForwardDecl(
1296     LLVMDIBuilderRef Builder, unsigned Tag, const char *Name,
1297     size_t NameLen, LLVMMetadataRef Scope, LLVMMetadataRef File, unsigned Line,
1298     unsigned RuntimeLang, uint64_t SizeInBits, uint32_t AlignInBits,
1299     const char *UniqueIdentifier, size_t UniqueIdentifierLen) {
1300   return wrap(unwrap(Builder)->createForwardDecl(
1301                   Tag, {Name, NameLen}, unwrapDI<DIScope>(Scope),
1302                   unwrapDI<DIFile>(File), Line, RuntimeLang, SizeInBits,
1303                   AlignInBits, {UniqueIdentifier, UniqueIdentifierLen}));
1304 }
1305 
1306 LLVMMetadataRef
1307 LLVMDIBuilderCreateReplaceableCompositeType(
1308     LLVMDIBuilderRef Builder, unsigned Tag, const char *Name,
1309     size_t NameLen, LLVMMetadataRef Scope, LLVMMetadataRef File, unsigned Line,
1310     unsigned RuntimeLang, uint64_t SizeInBits, uint32_t AlignInBits,
1311     LLVMDIFlags Flags, const char *UniqueIdentifier,
1312     size_t UniqueIdentifierLen) {
1313   return wrap(unwrap(Builder)->createReplaceableCompositeType(
1314                   Tag, {Name, NameLen}, unwrapDI<DIScope>(Scope),
1315                   unwrapDI<DIFile>(File), Line, RuntimeLang, SizeInBits,
1316                   AlignInBits, map_from_llvmDIFlags(Flags),
1317                   {UniqueIdentifier, UniqueIdentifierLen}));
1318 }
1319 
1320 LLVMMetadataRef
1321 LLVMDIBuilderCreateQualifiedType(LLVMDIBuilderRef Builder, unsigned Tag,
1322                                  LLVMMetadataRef Type) {
1323   return wrap(unwrap(Builder)->createQualifiedType(Tag,
1324                                                    unwrapDI<DIType>(Type)));
1325 }
1326 
1327 LLVMMetadataRef
1328 LLVMDIBuilderCreateReferenceType(LLVMDIBuilderRef Builder, unsigned Tag,
1329                                  LLVMMetadataRef Type) {
1330   return wrap(unwrap(Builder)->createReferenceType(Tag,
1331                                                    unwrapDI<DIType>(Type)));
1332 }
1333 
1334 LLVMMetadataRef
1335 LLVMDIBuilderCreateNullPtrType(LLVMDIBuilderRef Builder) {
1336   return wrap(unwrap(Builder)->createNullPtrType());
1337 }
1338 
1339 LLVMMetadataRef
1340 LLVMDIBuilderCreateMemberPointerType(LLVMDIBuilderRef Builder,
1341                                      LLVMMetadataRef PointeeType,
1342                                      LLVMMetadataRef ClassType,
1343                                      uint64_t SizeInBits,
1344                                      uint32_t AlignInBits,
1345                                      LLVMDIFlags Flags) {
1346   return wrap(unwrap(Builder)->createMemberPointerType(
1347                   unwrapDI<DIType>(PointeeType),
1348                   unwrapDI<DIType>(ClassType), AlignInBits, SizeInBits,
1349                   map_from_llvmDIFlags(Flags)));
1350 }
1351 
1352 LLVMMetadataRef
1353 LLVMDIBuilderCreateBitFieldMemberType(LLVMDIBuilderRef Builder,
1354                                       LLVMMetadataRef Scope,
1355                                       const char *Name, size_t NameLen,
1356                                       LLVMMetadataRef File, unsigned LineNumber,
1357                                       uint64_t SizeInBits,
1358                                       uint64_t OffsetInBits,
1359                                       uint64_t StorageOffsetInBits,
1360                                       LLVMDIFlags Flags, LLVMMetadataRef Type) {
1361   return wrap(unwrap(Builder)->createBitFieldMemberType(
1362                   unwrapDI<DIScope>(Scope), {Name, NameLen},
1363                   unwrapDI<DIFile>(File), LineNumber,
1364                   SizeInBits, OffsetInBits, StorageOffsetInBits,
1365                   map_from_llvmDIFlags(Flags), unwrapDI<DIType>(Type)));
1366 }
1367 
1368 LLVMMetadataRef LLVMDIBuilderCreateClassType(LLVMDIBuilderRef Builder,
1369     LLVMMetadataRef Scope, const char *Name, size_t NameLen,
1370     LLVMMetadataRef File, unsigned LineNumber, uint64_t SizeInBits,
1371     uint32_t AlignInBits, uint64_t OffsetInBits, LLVMDIFlags Flags,
1372     LLVMMetadataRef DerivedFrom,
1373     LLVMMetadataRef *Elements, unsigned NumElements,
1374     LLVMMetadataRef VTableHolder, LLVMMetadataRef TemplateParamsNode,
1375     const char *UniqueIdentifier, size_t UniqueIdentifierLen) {
1376   auto Elts = unwrap(Builder)->getOrCreateArray({unwrap(Elements),
1377                                                  NumElements});
1378   return wrap(unwrap(Builder)->createClassType(
1379                   unwrapDI<DIScope>(Scope), {Name, NameLen},
1380                   unwrapDI<DIFile>(File), LineNumber,
1381                   SizeInBits, AlignInBits, OffsetInBits,
1382                   map_from_llvmDIFlags(Flags), unwrapDI<DIType>(DerivedFrom),
1383                   Elts, unwrapDI<DIType>(VTableHolder),
1384                   unwrapDI<MDNode>(TemplateParamsNode),
1385                   {UniqueIdentifier, UniqueIdentifierLen}));
1386 }
1387 
1388 LLVMMetadataRef
1389 LLVMDIBuilderCreateArtificialType(LLVMDIBuilderRef Builder,
1390                                   LLVMMetadataRef Type) {
1391   return wrap(unwrap(Builder)->createArtificialType(unwrapDI<DIType>(Type)));
1392 }
1393 
1394 const char *LLVMDITypeGetName(LLVMMetadataRef DType, size_t *Length) {
1395   StringRef Str = unwrap<DIType>(DType)->getName();
1396   *Length = Str.size();
1397   return Str.data();
1398 }
1399 
1400 uint64_t LLVMDITypeGetSizeInBits(LLVMMetadataRef DType) {
1401   return unwrapDI<DIType>(DType)->getSizeInBits();
1402 }
1403 
1404 uint64_t LLVMDITypeGetOffsetInBits(LLVMMetadataRef DType) {
1405   return unwrapDI<DIType>(DType)->getOffsetInBits();
1406 }
1407 
1408 uint32_t LLVMDITypeGetAlignInBits(LLVMMetadataRef DType) {
1409   return unwrapDI<DIType>(DType)->getAlignInBits();
1410 }
1411 
1412 unsigned LLVMDITypeGetLine(LLVMMetadataRef DType) {
1413   return unwrapDI<DIType>(DType)->getLine();
1414 }
1415 
1416 LLVMDIFlags LLVMDITypeGetFlags(LLVMMetadataRef DType) {
1417   return map_to_llvmDIFlags(unwrapDI<DIType>(DType)->getFlags());
1418 }
1419 
1420 LLVMMetadataRef LLVMDIBuilderGetOrCreateTypeArray(LLVMDIBuilderRef Builder,
1421                                                   LLVMMetadataRef *Types,
1422                                                   size_t Length) {
1423   return wrap(
1424       unwrap(Builder)->getOrCreateTypeArray({unwrap(Types), Length}).get());
1425 }
1426 
1427 LLVMMetadataRef
1428 LLVMDIBuilderCreateSubroutineType(LLVMDIBuilderRef Builder,
1429                                   LLVMMetadataRef File,
1430                                   LLVMMetadataRef *ParameterTypes,
1431                                   unsigned NumParameterTypes,
1432                                   LLVMDIFlags Flags) {
1433   auto Elts = unwrap(Builder)->getOrCreateTypeArray({unwrap(ParameterTypes),
1434                                                      NumParameterTypes});
1435   return wrap(unwrap(Builder)->createSubroutineType(
1436     Elts, map_from_llvmDIFlags(Flags)));
1437 }
1438 
1439 LLVMMetadataRef LLVMDIBuilderCreateExpression(LLVMDIBuilderRef Builder,
1440                                               int64_t *Addr, size_t Length) {
1441   return wrap(unwrap(Builder)->createExpression(ArrayRef<int64_t>(Addr,
1442                                                                   Length)));
1443 }
1444 
1445 LLVMMetadataRef
1446 LLVMDIBuilderCreateConstantValueExpression(LLVMDIBuilderRef Builder,
1447                                            int64_t Value) {
1448   return wrap(unwrap(Builder)->createConstantValueExpression(Value));
1449 }
1450 
1451 LLVMMetadataRef LLVMDIBuilderCreateGlobalVariableExpression(
1452     LLVMDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
1453     size_t NameLen, const char *Linkage, size_t LinkLen, LLVMMetadataRef File,
1454     unsigned LineNo, LLVMMetadataRef Ty, LLVMBool LocalToUnit,
1455     LLVMMetadataRef Expr, LLVMMetadataRef Decl, uint32_t AlignInBits) {
1456   return wrap(unwrap(Builder)->createGlobalVariableExpression(
1457       unwrapDI<DIScope>(Scope), {Name, NameLen}, {Linkage, LinkLen},
1458       unwrapDI<DIFile>(File), LineNo, unwrapDI<DIType>(Ty), LocalToUnit,
1459       true, unwrap<DIExpression>(Expr), unwrapDI<MDNode>(Decl),
1460       nullptr, AlignInBits));
1461 }
1462 
1463 LLVMMetadataRef LLVMDIGlobalVariableExpressionGetVariable(LLVMMetadataRef GVE) {
1464   return wrap(unwrapDI<DIGlobalVariableExpression>(GVE)->getVariable());
1465 }
1466 
1467 LLVMMetadataRef LLVMDIGlobalVariableExpressionGetExpression(
1468     LLVMMetadataRef GVE) {
1469   return wrap(unwrapDI<DIGlobalVariableExpression>(GVE)->getExpression());
1470 }
1471 
1472 LLVMMetadataRef LLVMDIVariableGetFile(LLVMMetadataRef Var) {
1473   return wrap(unwrapDI<DIVariable>(Var)->getFile());
1474 }
1475 
1476 LLVMMetadataRef LLVMDIVariableGetScope(LLVMMetadataRef Var) {
1477   return wrap(unwrapDI<DIVariable>(Var)->getScope());
1478 }
1479 
1480 unsigned LLVMDIVariableGetLine(LLVMMetadataRef Var) {
1481   return unwrapDI<DIVariable>(Var)->getLine();
1482 }
1483 
1484 LLVMMetadataRef LLVMTemporaryMDNode(LLVMContextRef Ctx, LLVMMetadataRef *Data,
1485                                     size_t Count) {
1486   return wrap(
1487       MDTuple::getTemporary(*unwrap(Ctx), {unwrap(Data), Count}).release());
1488 }
1489 
1490 void LLVMDisposeTemporaryMDNode(LLVMMetadataRef TempNode) {
1491   MDNode::deleteTemporary(unwrapDI<MDNode>(TempNode));
1492 }
1493 
1494 void LLVMMetadataReplaceAllUsesWith(LLVMMetadataRef TargetMetadata,
1495                                     LLVMMetadataRef Replacement) {
1496   auto *Node = unwrapDI<MDNode>(TargetMetadata);
1497   Node->replaceAllUsesWith(unwrap<Metadata>(Replacement));
1498   MDNode::deleteTemporary(Node);
1499 }
1500 
1501 LLVMMetadataRef LLVMDIBuilderCreateTempGlobalVariableFwdDecl(
1502     LLVMDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
1503     size_t NameLen, const char *Linkage, size_t LnkLen, LLVMMetadataRef File,
1504     unsigned LineNo, LLVMMetadataRef Ty, LLVMBool LocalToUnit,
1505     LLVMMetadataRef Decl, uint32_t AlignInBits) {
1506   return wrap(unwrap(Builder)->createTempGlobalVariableFwdDecl(
1507       unwrapDI<DIScope>(Scope), {Name, NameLen}, {Linkage, LnkLen},
1508       unwrapDI<DIFile>(File), LineNo, unwrapDI<DIType>(Ty), LocalToUnit,
1509       unwrapDI<MDNode>(Decl), nullptr, AlignInBits));
1510 }
1511 
1512 LLVMValueRef
1513 LLVMDIBuilderInsertDeclareBefore(LLVMDIBuilderRef Builder, LLVMValueRef Storage,
1514                                  LLVMMetadataRef VarInfo, LLVMMetadataRef Expr,
1515                                  LLVMMetadataRef DL, LLVMValueRef Instr) {
1516   return wrap(unwrap(Builder)->insertDeclare(
1517                   unwrap(Storage), unwrap<DILocalVariable>(VarInfo),
1518                   unwrap<DIExpression>(Expr), unwrap<DILocation>(DL),
1519                   unwrap<Instruction>(Instr)));
1520 }
1521 
1522 LLVMValueRef LLVMDIBuilderInsertDeclareAtEnd(
1523     LLVMDIBuilderRef Builder, LLVMValueRef Storage, LLVMMetadataRef VarInfo,
1524     LLVMMetadataRef Expr, LLVMMetadataRef DL, LLVMBasicBlockRef Block) {
1525   return wrap(unwrap(Builder)->insertDeclare(
1526                   unwrap(Storage), unwrap<DILocalVariable>(VarInfo),
1527                   unwrap<DIExpression>(Expr), unwrap<DILocation>(DL),
1528                   unwrap(Block)));
1529 }
1530 
1531 LLVMValueRef LLVMDIBuilderInsertDbgValueBefore(LLVMDIBuilderRef Builder,
1532                                                LLVMValueRef Val,
1533                                                LLVMMetadataRef VarInfo,
1534                                                LLVMMetadataRef Expr,
1535                                                LLVMMetadataRef DebugLoc,
1536                                                LLVMValueRef Instr) {
1537   return wrap(unwrap(Builder)->insertDbgValueIntrinsic(
1538                   unwrap(Val), unwrap<DILocalVariable>(VarInfo),
1539                   unwrap<DIExpression>(Expr), unwrap<DILocation>(DebugLoc),
1540                   unwrap<Instruction>(Instr)));
1541 }
1542 
1543 LLVMValueRef LLVMDIBuilderInsertDbgValueAtEnd(LLVMDIBuilderRef Builder,
1544                                               LLVMValueRef Val,
1545                                               LLVMMetadataRef VarInfo,
1546                                               LLVMMetadataRef Expr,
1547                                               LLVMMetadataRef DebugLoc,
1548                                               LLVMBasicBlockRef Block) {
1549   return wrap(unwrap(Builder)->insertDbgValueIntrinsic(
1550                   unwrap(Val), unwrap<DILocalVariable>(VarInfo),
1551                   unwrap<DIExpression>(Expr), unwrap<DILocation>(DebugLoc),
1552                   unwrap(Block)));
1553 }
1554 
1555 LLVMMetadataRef LLVMDIBuilderCreateAutoVariable(
1556     LLVMDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
1557     size_t NameLen, LLVMMetadataRef File, unsigned LineNo, LLVMMetadataRef Ty,
1558     LLVMBool AlwaysPreserve, LLVMDIFlags Flags, uint32_t AlignInBits) {
1559   return wrap(unwrap(Builder)->createAutoVariable(
1560                   unwrap<DIScope>(Scope), {Name, NameLen}, unwrap<DIFile>(File),
1561                   LineNo, unwrap<DIType>(Ty), AlwaysPreserve,
1562                   map_from_llvmDIFlags(Flags), AlignInBits));
1563 }
1564 
1565 LLVMMetadataRef LLVMDIBuilderCreateParameterVariable(
1566     LLVMDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
1567     size_t NameLen, unsigned ArgNo, LLVMMetadataRef File, unsigned LineNo,
1568     LLVMMetadataRef Ty, LLVMBool AlwaysPreserve, LLVMDIFlags Flags) {
1569   return wrap(unwrap(Builder)->createParameterVariable(
1570                   unwrap<DIScope>(Scope), {Name, NameLen}, ArgNo, unwrap<DIFile>(File),
1571                   LineNo, unwrap<DIType>(Ty), AlwaysPreserve,
1572                   map_from_llvmDIFlags(Flags)));
1573 }
1574 
1575 LLVMMetadataRef LLVMDIBuilderGetOrCreateSubrange(LLVMDIBuilderRef Builder,
1576                                                  int64_t Lo, int64_t Count) {
1577   return wrap(unwrap(Builder)->getOrCreateSubrange(Lo, Count));
1578 }
1579 
1580 LLVMMetadataRef LLVMDIBuilderGetOrCreateArray(LLVMDIBuilderRef Builder,
1581                                               LLVMMetadataRef *Data,
1582                                               size_t Length) {
1583   Metadata **DataValue = unwrap(Data);
1584   return wrap(unwrap(Builder)->getOrCreateArray({DataValue, Length}).get());
1585 }
1586 
1587 LLVMMetadataRef LLVMGetSubprogram(LLVMValueRef Func) {
1588   return wrap(unwrap<Function>(Func)->getSubprogram());
1589 }
1590 
1591 void LLVMSetSubprogram(LLVMValueRef Func, LLVMMetadataRef SP) {
1592   unwrap<Function>(Func)->setSubprogram(unwrap<DISubprogram>(SP));
1593 }
1594 
1595 unsigned LLVMDISubprogramGetLine(LLVMMetadataRef Subprogram) {
1596   return unwrapDI<DISubprogram>(Subprogram)->getLine();
1597 }
1598 
1599 LLVMMetadataRef LLVMInstructionGetDebugLoc(LLVMValueRef Inst) {
1600   return wrap(unwrap<Instruction>(Inst)->getDebugLoc().getAsMDNode());
1601 }
1602 
1603 void LLVMInstructionSetDebugLoc(LLVMValueRef Inst, LLVMMetadataRef Loc) {
1604   if (Loc)
1605     unwrap<Instruction>(Inst)->setDebugLoc(DebugLoc(unwrap<MDNode>(Loc)));
1606   else
1607     unwrap<Instruction>(Inst)->setDebugLoc(DebugLoc());
1608 }
1609 
1610 LLVMMetadataKind LLVMGetMetadataKind(LLVMMetadataRef Metadata) {
1611   switch(unwrap(Metadata)->getMetadataID()) {
1612 #define HANDLE_METADATA_LEAF(CLASS) \
1613   case Metadata::CLASS##Kind: \
1614     return (LLVMMetadataKind)LLVM##CLASS##MetadataKind;
1615 #include "llvm/IR/Metadata.def"
1616   default:
1617     return (LLVMMetadataKind)LLVMGenericDINodeMetadataKind;
1618   }
1619 }
1620