xref: /freebsd/contrib/llvm-project/llvm/lib/IR/DebugInfo.cpp (revision 963f5dc7a30624e95d72fb7f87b8892651164e46) 
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 LLVMMetadataRef LLVMDIBuilderCreateCompileUnit(
913     LLVMDIBuilderRef Builder, LLVMDWARFSourceLanguage Lang,
914     LLVMMetadataRef FileRef, const char *Producer, size_t ProducerLen,
915     LLVMBool isOptimized, const char *Flags, size_t FlagsLen,
916     unsigned RuntimeVer, const char *SplitName, size_t SplitNameLen,
917     LLVMDWARFEmissionKind Kind, unsigned DWOId, LLVMBool SplitDebugInlining,
918     LLVMBool DebugInfoForProfiling, const char *SysRoot, size_t SysRootLen,
919     const char *SDK, size_t SDKLen) {
920   auto File = unwrapDI<DIFile>(FileRef);
921 
922   return wrap(unwrap(Builder)->createCompileUnit(
923       map_from_llvmDWARFsourcelanguage(Lang), File,
924       StringRef(Producer, ProducerLen), isOptimized, StringRef(Flags, FlagsLen),
925       RuntimeVer, StringRef(SplitName, SplitNameLen),
926       static_cast<DICompileUnit::DebugEmissionKind>(Kind), DWOId,
927       SplitDebugInlining, DebugInfoForProfiling,
928       DICompileUnit::DebugNameTableKind::Default, false,
929       StringRef(SysRoot, SysRootLen), StringRef(SDK, SDKLen)));
930 }
931 
932 LLVMMetadataRef
933 LLVMDIBuilderCreateFile(LLVMDIBuilderRef Builder, const char *Filename,
934                         size_t FilenameLen, const char *Directory,
935                         size_t DirectoryLen) {
936   return wrap(unwrap(Builder)->createFile(StringRef(Filename, FilenameLen),
937                                           StringRef(Directory, DirectoryLen)));
938 }
939 
940 LLVMMetadataRef
941 LLVMDIBuilderCreateModule(LLVMDIBuilderRef Builder, LLVMMetadataRef ParentScope,
942                           const char *Name, size_t NameLen,
943                           const char *ConfigMacros, size_t ConfigMacrosLen,
944                           const char *IncludePath, size_t IncludePathLen,
945                           const char *APINotesFile, size_t APINotesFileLen) {
946   return wrap(unwrap(Builder)->createModule(
947       unwrapDI<DIScope>(ParentScope), StringRef(Name, NameLen),
948       StringRef(ConfigMacros, ConfigMacrosLen),
949       StringRef(IncludePath, IncludePathLen),
950       StringRef(APINotesFile, APINotesFileLen)));
951 }
952 
953 LLVMMetadataRef LLVMDIBuilderCreateNameSpace(LLVMDIBuilderRef Builder,
954                                              LLVMMetadataRef ParentScope,
955                                              const char *Name, size_t NameLen,
956                                              LLVMBool ExportSymbols) {
957   return wrap(unwrap(Builder)->createNameSpace(
958       unwrapDI<DIScope>(ParentScope), StringRef(Name, NameLen), ExportSymbols));
959 }
960 
961 LLVMMetadataRef LLVMDIBuilderCreateFunction(
962     LLVMDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
963     size_t NameLen, const char *LinkageName, size_t LinkageNameLen,
964     LLVMMetadataRef File, unsigned LineNo, LLVMMetadataRef Ty,
965     LLVMBool IsLocalToUnit, LLVMBool IsDefinition,
966     unsigned ScopeLine, LLVMDIFlags Flags, LLVMBool IsOptimized) {
967   return wrap(unwrap(Builder)->createFunction(
968       unwrapDI<DIScope>(Scope), {Name, NameLen}, {LinkageName, LinkageNameLen},
969       unwrapDI<DIFile>(File), LineNo, unwrapDI<DISubroutineType>(Ty), ScopeLine,
970       map_from_llvmDIFlags(Flags),
971       pack_into_DISPFlags(IsLocalToUnit, IsDefinition, IsOptimized), nullptr,
972       nullptr, nullptr));
973 }
974 
975 
976 LLVMMetadataRef LLVMDIBuilderCreateLexicalBlock(
977     LLVMDIBuilderRef Builder, LLVMMetadataRef Scope,
978     LLVMMetadataRef File, unsigned Line, unsigned Col) {
979   return wrap(unwrap(Builder)->createLexicalBlock(unwrapDI<DIScope>(Scope),
980                                                   unwrapDI<DIFile>(File),
981                                                   Line, Col));
982 }
983 
984 LLVMMetadataRef
985 LLVMDIBuilderCreateLexicalBlockFile(LLVMDIBuilderRef Builder,
986                                     LLVMMetadataRef Scope,
987                                     LLVMMetadataRef File,
988                                     unsigned Discriminator) {
989   return wrap(unwrap(Builder)->createLexicalBlockFile(unwrapDI<DIScope>(Scope),
990                                                       unwrapDI<DIFile>(File),
991                                                       Discriminator));
992 }
993 
994 LLVMMetadataRef
995 LLVMDIBuilderCreateImportedModuleFromNamespace(LLVMDIBuilderRef Builder,
996                                                LLVMMetadataRef Scope,
997                                                LLVMMetadataRef NS,
998                                                LLVMMetadataRef File,
999                                                unsigned Line) {
1000   return wrap(unwrap(Builder)->createImportedModule(unwrapDI<DIScope>(Scope),
1001                                                     unwrapDI<DINamespace>(NS),
1002                                                     unwrapDI<DIFile>(File),
1003                                                     Line));
1004 }
1005 
1006 LLVMMetadataRef
1007 LLVMDIBuilderCreateImportedModuleFromAlias(LLVMDIBuilderRef Builder,
1008                                            LLVMMetadataRef Scope,
1009                                            LLVMMetadataRef ImportedEntity,
1010                                            LLVMMetadataRef File,
1011                                            unsigned Line) {
1012   return wrap(unwrap(Builder)->createImportedModule(
1013                   unwrapDI<DIScope>(Scope),
1014                   unwrapDI<DIImportedEntity>(ImportedEntity),
1015                   unwrapDI<DIFile>(File), Line));
1016 }
1017 
1018 LLVMMetadataRef
1019 LLVMDIBuilderCreateImportedModuleFromModule(LLVMDIBuilderRef Builder,
1020                                             LLVMMetadataRef Scope,
1021                                             LLVMMetadataRef M,
1022                                             LLVMMetadataRef File,
1023                                             unsigned Line) {
1024   return wrap(unwrap(Builder)->createImportedModule(unwrapDI<DIScope>(Scope),
1025                                                     unwrapDI<DIModule>(M),
1026                                                     unwrapDI<DIFile>(File),
1027                                                     Line));
1028 }
1029 
1030 LLVMMetadataRef
1031 LLVMDIBuilderCreateImportedDeclaration(LLVMDIBuilderRef Builder,
1032                                        LLVMMetadataRef Scope,
1033                                        LLVMMetadataRef Decl,
1034                                        LLVMMetadataRef File,
1035                                        unsigned Line,
1036                                        const char *Name, size_t NameLen) {
1037   return wrap(unwrap(Builder)->createImportedDeclaration(
1038                   unwrapDI<DIScope>(Scope),
1039                   unwrapDI<DINode>(Decl),
1040                   unwrapDI<DIFile>(File), Line, {Name, NameLen}));
1041 }
1042 
1043 LLVMMetadataRef
1044 LLVMDIBuilderCreateDebugLocation(LLVMContextRef Ctx, unsigned Line,
1045                                  unsigned Column, LLVMMetadataRef Scope,
1046                                  LLVMMetadataRef InlinedAt) {
1047   return wrap(DILocation::get(*unwrap(Ctx), Line, Column, unwrap(Scope),
1048                               unwrap(InlinedAt)));
1049 }
1050 
1051 unsigned LLVMDILocationGetLine(LLVMMetadataRef Location) {
1052   return unwrapDI<DILocation>(Location)->getLine();
1053 }
1054 
1055 unsigned LLVMDILocationGetColumn(LLVMMetadataRef Location) {
1056   return unwrapDI<DILocation>(Location)->getColumn();
1057 }
1058 
1059 LLVMMetadataRef LLVMDILocationGetScope(LLVMMetadataRef Location) {
1060   return wrap(unwrapDI<DILocation>(Location)->getScope());
1061 }
1062 
1063 LLVMMetadataRef LLVMDILocationGetInlinedAt(LLVMMetadataRef Location) {
1064   return wrap(unwrapDI<DILocation>(Location)->getInlinedAt());
1065 }
1066 
1067 LLVMMetadataRef LLVMDIScopeGetFile(LLVMMetadataRef Scope) {
1068   return wrap(unwrapDI<DIScope>(Scope)->getFile());
1069 }
1070 
1071 const char *LLVMDIFileGetDirectory(LLVMMetadataRef File, unsigned *Len) {
1072   auto Dir = unwrapDI<DIFile>(File)->getDirectory();
1073   *Len = Dir.size();
1074   return Dir.data();
1075 }
1076 
1077 const char *LLVMDIFileGetFilename(LLVMMetadataRef File, unsigned *Len) {
1078   auto Name = unwrapDI<DIFile>(File)->getFilename();
1079   *Len = Name.size();
1080   return Name.data();
1081 }
1082 
1083 const char *LLVMDIFileGetSource(LLVMMetadataRef File, unsigned *Len) {
1084   if (auto Src = unwrapDI<DIFile>(File)->getSource()) {
1085     *Len = Src->size();
1086     return Src->data();
1087   }
1088   *Len = 0;
1089   return "";
1090 }
1091 
1092 LLVMMetadataRef LLVMDIBuilderCreateMacro(LLVMDIBuilderRef Builder,
1093                                          LLVMMetadataRef ParentMacroFile,
1094                                          unsigned Line,
1095                                          LLVMDWARFMacinfoRecordType RecordType,
1096                                          const char *Name, size_t NameLen,
1097                                          const char *Value, size_t ValueLen) {
1098   return wrap(
1099       unwrap(Builder)->createMacro(unwrapDI<DIMacroFile>(ParentMacroFile), Line,
1100                                    static_cast<MacinfoRecordType>(RecordType),
1101                                    {Name, NameLen}, {Value, ValueLen}));
1102 }
1103 
1104 LLVMMetadataRef
1105 LLVMDIBuilderCreateTempMacroFile(LLVMDIBuilderRef Builder,
1106                                  LLVMMetadataRef ParentMacroFile, unsigned Line,
1107                                  LLVMMetadataRef File) {
1108   return wrap(unwrap(Builder)->createTempMacroFile(
1109       unwrapDI<DIMacroFile>(ParentMacroFile), Line, unwrapDI<DIFile>(File)));
1110 }
1111 
1112 LLVMMetadataRef LLVMDIBuilderCreateEnumerator(LLVMDIBuilderRef Builder,
1113                                               const char *Name, size_t NameLen,
1114                                               int64_t Value,
1115                                               LLVMBool IsUnsigned) {
1116   return wrap(unwrap(Builder)->createEnumerator({Name, NameLen}, Value,
1117                                                 IsUnsigned != 0));
1118 }
1119 
1120 LLVMMetadataRef LLVMDIBuilderCreateEnumerationType(
1121   LLVMDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
1122   size_t NameLen, LLVMMetadataRef File, unsigned LineNumber,
1123   uint64_t SizeInBits, uint32_t AlignInBits, LLVMMetadataRef *Elements,
1124   unsigned NumElements, LLVMMetadataRef ClassTy) {
1125 auto Elts = unwrap(Builder)->getOrCreateArray({unwrap(Elements),
1126                                                NumElements});
1127 return wrap(unwrap(Builder)->createEnumerationType(
1128     unwrapDI<DIScope>(Scope), {Name, NameLen}, unwrapDI<DIFile>(File),
1129     LineNumber, SizeInBits, AlignInBits, Elts, unwrapDI<DIType>(ClassTy)));
1130 }
1131 
1132 LLVMMetadataRef LLVMDIBuilderCreateUnionType(
1133   LLVMDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
1134   size_t NameLen, LLVMMetadataRef File, unsigned LineNumber,
1135   uint64_t SizeInBits, uint32_t AlignInBits, LLVMDIFlags Flags,
1136   LLVMMetadataRef *Elements, unsigned NumElements, unsigned RunTimeLang,
1137   const char *UniqueId, size_t UniqueIdLen) {
1138   auto Elts = unwrap(Builder)->getOrCreateArray({unwrap(Elements),
1139                                                  NumElements});
1140   return wrap(unwrap(Builder)->createUnionType(
1141      unwrapDI<DIScope>(Scope), {Name, NameLen}, unwrapDI<DIFile>(File),
1142      LineNumber, SizeInBits, AlignInBits, map_from_llvmDIFlags(Flags),
1143      Elts, RunTimeLang, {UniqueId, UniqueIdLen}));
1144 }
1145 
1146 
1147 LLVMMetadataRef
1148 LLVMDIBuilderCreateArrayType(LLVMDIBuilderRef Builder, uint64_t Size,
1149                              uint32_t AlignInBits, LLVMMetadataRef Ty,
1150                              LLVMMetadataRef *Subscripts,
1151                              unsigned NumSubscripts) {
1152   auto Subs = unwrap(Builder)->getOrCreateArray({unwrap(Subscripts),
1153                                                  NumSubscripts});
1154   return wrap(unwrap(Builder)->createArrayType(Size, AlignInBits,
1155                                                unwrapDI<DIType>(Ty), Subs));
1156 }
1157 
1158 LLVMMetadataRef
1159 LLVMDIBuilderCreateVectorType(LLVMDIBuilderRef Builder, uint64_t Size,
1160                               uint32_t AlignInBits, LLVMMetadataRef Ty,
1161                               LLVMMetadataRef *Subscripts,
1162                               unsigned NumSubscripts) {
1163   auto Subs = unwrap(Builder)->getOrCreateArray({unwrap(Subscripts),
1164                                                  NumSubscripts});
1165   return wrap(unwrap(Builder)->createVectorType(Size, AlignInBits,
1166                                                 unwrapDI<DIType>(Ty), Subs));
1167 }
1168 
1169 LLVMMetadataRef
1170 LLVMDIBuilderCreateBasicType(LLVMDIBuilderRef Builder, const char *Name,
1171                              size_t NameLen, uint64_t SizeInBits,
1172                              LLVMDWARFTypeEncoding Encoding,
1173                              LLVMDIFlags Flags) {
1174   return wrap(unwrap(Builder)->createBasicType({Name, NameLen},
1175                                                SizeInBits, Encoding,
1176                                                map_from_llvmDIFlags(Flags)));
1177 }
1178 
1179 LLVMMetadataRef LLVMDIBuilderCreatePointerType(
1180     LLVMDIBuilderRef Builder, LLVMMetadataRef PointeeTy,
1181     uint64_t SizeInBits, uint32_t AlignInBits, unsigned AddressSpace,
1182     const char *Name, size_t NameLen) {
1183   return wrap(unwrap(Builder)->createPointerType(unwrapDI<DIType>(PointeeTy),
1184                                          SizeInBits, AlignInBits,
1185                                          AddressSpace, {Name, NameLen}));
1186 }
1187 
1188 LLVMMetadataRef LLVMDIBuilderCreateStructType(
1189     LLVMDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
1190     size_t NameLen, LLVMMetadataRef File, unsigned LineNumber,
1191     uint64_t SizeInBits, uint32_t AlignInBits, LLVMDIFlags Flags,
1192     LLVMMetadataRef DerivedFrom, LLVMMetadataRef *Elements,
1193     unsigned NumElements, unsigned RunTimeLang, LLVMMetadataRef VTableHolder,
1194     const char *UniqueId, size_t UniqueIdLen) {
1195   auto Elts = unwrap(Builder)->getOrCreateArray({unwrap(Elements),
1196                                                  NumElements});
1197   return wrap(unwrap(Builder)->createStructType(
1198       unwrapDI<DIScope>(Scope), {Name, NameLen}, unwrapDI<DIFile>(File),
1199       LineNumber, SizeInBits, AlignInBits, map_from_llvmDIFlags(Flags),
1200       unwrapDI<DIType>(DerivedFrom), Elts, RunTimeLang,
1201       unwrapDI<DIType>(VTableHolder), {UniqueId, UniqueIdLen}));
1202 }
1203 
1204 LLVMMetadataRef LLVMDIBuilderCreateMemberType(
1205     LLVMDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
1206     size_t NameLen, LLVMMetadataRef File, unsigned LineNo, uint64_t SizeInBits,
1207     uint32_t AlignInBits, uint64_t OffsetInBits, LLVMDIFlags Flags,
1208     LLVMMetadataRef Ty) {
1209   return wrap(unwrap(Builder)->createMemberType(unwrapDI<DIScope>(Scope),
1210       {Name, NameLen}, unwrapDI<DIFile>(File), LineNo, SizeInBits, AlignInBits,
1211       OffsetInBits, map_from_llvmDIFlags(Flags), unwrapDI<DIType>(Ty)));
1212 }
1213 
1214 LLVMMetadataRef
1215 LLVMDIBuilderCreateUnspecifiedType(LLVMDIBuilderRef Builder, const char *Name,
1216                                    size_t NameLen) {
1217   return wrap(unwrap(Builder)->createUnspecifiedType({Name, NameLen}));
1218 }
1219 
1220 LLVMMetadataRef
1221 LLVMDIBuilderCreateStaticMemberType(
1222     LLVMDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
1223     size_t NameLen, LLVMMetadataRef File, unsigned LineNumber,
1224     LLVMMetadataRef Type, LLVMDIFlags Flags, LLVMValueRef ConstantVal,
1225     uint32_t AlignInBits) {
1226   return wrap(unwrap(Builder)->createStaticMemberType(
1227                   unwrapDI<DIScope>(Scope), {Name, NameLen},
1228                   unwrapDI<DIFile>(File), LineNumber, unwrapDI<DIType>(Type),
1229                   map_from_llvmDIFlags(Flags), unwrap<Constant>(ConstantVal),
1230                   AlignInBits));
1231 }
1232 
1233 LLVMMetadataRef
1234 LLVMDIBuilderCreateObjCIVar(LLVMDIBuilderRef Builder,
1235                             const char *Name, size_t NameLen,
1236                             LLVMMetadataRef File, unsigned LineNo,
1237                             uint64_t SizeInBits, uint32_t AlignInBits,
1238                             uint64_t OffsetInBits, LLVMDIFlags Flags,
1239                             LLVMMetadataRef Ty, LLVMMetadataRef PropertyNode) {
1240   return wrap(unwrap(Builder)->createObjCIVar(
1241                   {Name, NameLen}, unwrapDI<DIFile>(File), LineNo,
1242                   SizeInBits, AlignInBits, OffsetInBits,
1243                   map_from_llvmDIFlags(Flags), unwrapDI<DIType>(Ty),
1244                   unwrapDI<MDNode>(PropertyNode)));
1245 }
1246 
1247 LLVMMetadataRef
1248 LLVMDIBuilderCreateObjCProperty(LLVMDIBuilderRef Builder,
1249                                 const char *Name, size_t NameLen,
1250                                 LLVMMetadataRef File, unsigned LineNo,
1251                                 const char *GetterName, size_t GetterNameLen,
1252                                 const char *SetterName, size_t SetterNameLen,
1253                                 unsigned PropertyAttributes,
1254                                 LLVMMetadataRef Ty) {
1255   return wrap(unwrap(Builder)->createObjCProperty(
1256                   {Name, NameLen}, unwrapDI<DIFile>(File), LineNo,
1257                   {GetterName, GetterNameLen}, {SetterName, SetterNameLen},
1258                   PropertyAttributes, unwrapDI<DIType>(Ty)));
1259 }
1260 
1261 LLVMMetadataRef
1262 LLVMDIBuilderCreateObjectPointerType(LLVMDIBuilderRef Builder,
1263                                      LLVMMetadataRef Type) {
1264   return wrap(unwrap(Builder)->createObjectPointerType(unwrapDI<DIType>(Type)));
1265 }
1266 
1267 LLVMMetadataRef
1268 LLVMDIBuilderCreateTypedef(LLVMDIBuilderRef Builder, LLVMMetadataRef Type,
1269                            const char *Name, size_t NameLen,
1270                            LLVMMetadataRef File, unsigned LineNo,
1271                            LLVMMetadataRef Scope, uint32_t AlignInBits) {
1272   return wrap(unwrap(Builder)->createTypedef(
1273       unwrapDI<DIType>(Type), {Name, NameLen}, unwrapDI<DIFile>(File), LineNo,
1274       unwrapDI<DIScope>(Scope), AlignInBits));
1275 }
1276 
1277 LLVMMetadataRef
1278 LLVMDIBuilderCreateInheritance(LLVMDIBuilderRef Builder,
1279                                LLVMMetadataRef Ty, LLVMMetadataRef BaseTy,
1280                                uint64_t BaseOffset, uint32_t VBPtrOffset,
1281                                LLVMDIFlags Flags) {
1282   return wrap(unwrap(Builder)->createInheritance(
1283                   unwrapDI<DIType>(Ty), unwrapDI<DIType>(BaseTy),
1284                   BaseOffset, VBPtrOffset, map_from_llvmDIFlags(Flags)));
1285 }
1286 
1287 LLVMMetadataRef
1288 LLVMDIBuilderCreateForwardDecl(
1289     LLVMDIBuilderRef Builder, unsigned Tag, const char *Name,
1290     size_t NameLen, LLVMMetadataRef Scope, LLVMMetadataRef File, unsigned Line,
1291     unsigned RuntimeLang, uint64_t SizeInBits, uint32_t AlignInBits,
1292     const char *UniqueIdentifier, size_t UniqueIdentifierLen) {
1293   return wrap(unwrap(Builder)->createForwardDecl(
1294                   Tag, {Name, NameLen}, unwrapDI<DIScope>(Scope),
1295                   unwrapDI<DIFile>(File), Line, RuntimeLang, SizeInBits,
1296                   AlignInBits, {UniqueIdentifier, UniqueIdentifierLen}));
1297 }
1298 
1299 LLVMMetadataRef
1300 LLVMDIBuilderCreateReplaceableCompositeType(
1301     LLVMDIBuilderRef Builder, unsigned Tag, const char *Name,
1302     size_t NameLen, LLVMMetadataRef Scope, LLVMMetadataRef File, unsigned Line,
1303     unsigned RuntimeLang, uint64_t SizeInBits, uint32_t AlignInBits,
1304     LLVMDIFlags Flags, const char *UniqueIdentifier,
1305     size_t UniqueIdentifierLen) {
1306   return wrap(unwrap(Builder)->createReplaceableCompositeType(
1307                   Tag, {Name, NameLen}, unwrapDI<DIScope>(Scope),
1308                   unwrapDI<DIFile>(File), Line, RuntimeLang, SizeInBits,
1309                   AlignInBits, map_from_llvmDIFlags(Flags),
1310                   {UniqueIdentifier, UniqueIdentifierLen}));
1311 }
1312 
1313 LLVMMetadataRef
1314 LLVMDIBuilderCreateQualifiedType(LLVMDIBuilderRef Builder, unsigned Tag,
1315                                  LLVMMetadataRef Type) {
1316   return wrap(unwrap(Builder)->createQualifiedType(Tag,
1317                                                    unwrapDI<DIType>(Type)));
1318 }
1319 
1320 LLVMMetadataRef
1321 LLVMDIBuilderCreateReferenceType(LLVMDIBuilderRef Builder, unsigned Tag,
1322                                  LLVMMetadataRef Type) {
1323   return wrap(unwrap(Builder)->createReferenceType(Tag,
1324                                                    unwrapDI<DIType>(Type)));
1325 }
1326 
1327 LLVMMetadataRef
1328 LLVMDIBuilderCreateNullPtrType(LLVMDIBuilderRef Builder) {
1329   return wrap(unwrap(Builder)->createNullPtrType());
1330 }
1331 
1332 LLVMMetadataRef
1333 LLVMDIBuilderCreateMemberPointerType(LLVMDIBuilderRef Builder,
1334                                      LLVMMetadataRef PointeeType,
1335                                      LLVMMetadataRef ClassType,
1336                                      uint64_t SizeInBits,
1337                                      uint32_t AlignInBits,
1338                                      LLVMDIFlags Flags) {
1339   return wrap(unwrap(Builder)->createMemberPointerType(
1340                   unwrapDI<DIType>(PointeeType),
1341                   unwrapDI<DIType>(ClassType), AlignInBits, SizeInBits,
1342                   map_from_llvmDIFlags(Flags)));
1343 }
1344 
1345 LLVMMetadataRef
1346 LLVMDIBuilderCreateBitFieldMemberType(LLVMDIBuilderRef Builder,
1347                                       LLVMMetadataRef Scope,
1348                                       const char *Name, size_t NameLen,
1349                                       LLVMMetadataRef File, unsigned LineNumber,
1350                                       uint64_t SizeInBits,
1351                                       uint64_t OffsetInBits,
1352                                       uint64_t StorageOffsetInBits,
1353                                       LLVMDIFlags Flags, LLVMMetadataRef Type) {
1354   return wrap(unwrap(Builder)->createBitFieldMemberType(
1355                   unwrapDI<DIScope>(Scope), {Name, NameLen},
1356                   unwrapDI<DIFile>(File), LineNumber,
1357                   SizeInBits, OffsetInBits, StorageOffsetInBits,
1358                   map_from_llvmDIFlags(Flags), unwrapDI<DIType>(Type)));
1359 }
1360 
1361 LLVMMetadataRef LLVMDIBuilderCreateClassType(LLVMDIBuilderRef Builder,
1362     LLVMMetadataRef Scope, const char *Name, size_t NameLen,
1363     LLVMMetadataRef File, unsigned LineNumber, uint64_t SizeInBits,
1364     uint32_t AlignInBits, uint64_t OffsetInBits, LLVMDIFlags Flags,
1365     LLVMMetadataRef DerivedFrom,
1366     LLVMMetadataRef *Elements, unsigned NumElements,
1367     LLVMMetadataRef VTableHolder, LLVMMetadataRef TemplateParamsNode,
1368     const char *UniqueIdentifier, size_t UniqueIdentifierLen) {
1369   auto Elts = unwrap(Builder)->getOrCreateArray({unwrap(Elements),
1370                                                  NumElements});
1371   return wrap(unwrap(Builder)->createClassType(
1372                   unwrapDI<DIScope>(Scope), {Name, NameLen},
1373                   unwrapDI<DIFile>(File), LineNumber,
1374                   SizeInBits, AlignInBits, OffsetInBits,
1375                   map_from_llvmDIFlags(Flags), unwrapDI<DIType>(DerivedFrom),
1376                   Elts, unwrapDI<DIType>(VTableHolder),
1377                   unwrapDI<MDNode>(TemplateParamsNode),
1378                   {UniqueIdentifier, UniqueIdentifierLen}));
1379 }
1380 
1381 LLVMMetadataRef
1382 LLVMDIBuilderCreateArtificialType(LLVMDIBuilderRef Builder,
1383                                   LLVMMetadataRef Type) {
1384   return wrap(unwrap(Builder)->createArtificialType(unwrapDI<DIType>(Type)));
1385 }
1386 
1387 const char *LLVMDITypeGetName(LLVMMetadataRef DType, size_t *Length) {
1388   StringRef Str = unwrap<DIType>(DType)->getName();
1389   *Length = Str.size();
1390   return Str.data();
1391 }
1392 
1393 uint64_t LLVMDITypeGetSizeInBits(LLVMMetadataRef DType) {
1394   return unwrapDI<DIType>(DType)->getSizeInBits();
1395 }
1396 
1397 uint64_t LLVMDITypeGetOffsetInBits(LLVMMetadataRef DType) {
1398   return unwrapDI<DIType>(DType)->getOffsetInBits();
1399 }
1400 
1401 uint32_t LLVMDITypeGetAlignInBits(LLVMMetadataRef DType) {
1402   return unwrapDI<DIType>(DType)->getAlignInBits();
1403 }
1404 
1405 unsigned LLVMDITypeGetLine(LLVMMetadataRef DType) {
1406   return unwrapDI<DIType>(DType)->getLine();
1407 }
1408 
1409 LLVMDIFlags LLVMDITypeGetFlags(LLVMMetadataRef DType) {
1410   return map_to_llvmDIFlags(unwrapDI<DIType>(DType)->getFlags());
1411 }
1412 
1413 LLVMMetadataRef LLVMDIBuilderGetOrCreateTypeArray(LLVMDIBuilderRef Builder,
1414                                                   LLVMMetadataRef *Types,
1415                                                   size_t Length) {
1416   return wrap(
1417       unwrap(Builder)->getOrCreateTypeArray({unwrap(Types), Length}).get());
1418 }
1419 
1420 LLVMMetadataRef
1421 LLVMDIBuilderCreateSubroutineType(LLVMDIBuilderRef Builder,
1422                                   LLVMMetadataRef File,
1423                                   LLVMMetadataRef *ParameterTypes,
1424                                   unsigned NumParameterTypes,
1425                                   LLVMDIFlags Flags) {
1426   auto Elts = unwrap(Builder)->getOrCreateTypeArray({unwrap(ParameterTypes),
1427                                                      NumParameterTypes});
1428   return wrap(unwrap(Builder)->createSubroutineType(
1429     Elts, map_from_llvmDIFlags(Flags)));
1430 }
1431 
1432 LLVMMetadataRef LLVMDIBuilderCreateExpression(LLVMDIBuilderRef Builder,
1433                                               int64_t *Addr, size_t Length) {
1434   return wrap(unwrap(Builder)->createExpression(ArrayRef<int64_t>(Addr,
1435                                                                   Length)));
1436 }
1437 
1438 LLVMMetadataRef
1439 LLVMDIBuilderCreateConstantValueExpression(LLVMDIBuilderRef Builder,
1440                                            int64_t Value) {
1441   return wrap(unwrap(Builder)->createConstantValueExpression(Value));
1442 }
1443 
1444 LLVMMetadataRef LLVMDIBuilderCreateGlobalVariableExpression(
1445     LLVMDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
1446     size_t NameLen, const char *Linkage, size_t LinkLen, LLVMMetadataRef File,
1447     unsigned LineNo, LLVMMetadataRef Ty, LLVMBool LocalToUnit,
1448     LLVMMetadataRef Expr, LLVMMetadataRef Decl, uint32_t AlignInBits) {
1449   return wrap(unwrap(Builder)->createGlobalVariableExpression(
1450       unwrapDI<DIScope>(Scope), {Name, NameLen}, {Linkage, LinkLen},
1451       unwrapDI<DIFile>(File), LineNo, unwrapDI<DIType>(Ty), LocalToUnit,
1452       true, unwrap<DIExpression>(Expr), unwrapDI<MDNode>(Decl),
1453       nullptr, AlignInBits));
1454 }
1455 
1456 LLVMMetadataRef LLVMDIGlobalVariableExpressionGetVariable(LLVMMetadataRef GVE) {
1457   return wrap(unwrapDI<DIGlobalVariableExpression>(GVE)->getVariable());
1458 }
1459 
1460 LLVMMetadataRef LLVMDIGlobalVariableExpressionGetExpression(
1461     LLVMMetadataRef GVE) {
1462   return wrap(unwrapDI<DIGlobalVariableExpression>(GVE)->getExpression());
1463 }
1464 
1465 LLVMMetadataRef LLVMDIVariableGetFile(LLVMMetadataRef Var) {
1466   return wrap(unwrapDI<DIVariable>(Var)->getFile());
1467 }
1468 
1469 LLVMMetadataRef LLVMDIVariableGetScope(LLVMMetadataRef Var) {
1470   return wrap(unwrapDI<DIVariable>(Var)->getScope());
1471 }
1472 
1473 unsigned LLVMDIVariableGetLine(LLVMMetadataRef Var) {
1474   return unwrapDI<DIVariable>(Var)->getLine();
1475 }
1476 
1477 LLVMMetadataRef LLVMTemporaryMDNode(LLVMContextRef Ctx, LLVMMetadataRef *Data,
1478                                     size_t Count) {
1479   return wrap(
1480       MDTuple::getTemporary(*unwrap(Ctx), {unwrap(Data), Count}).release());
1481 }
1482 
1483 void LLVMDisposeTemporaryMDNode(LLVMMetadataRef TempNode) {
1484   MDNode::deleteTemporary(unwrapDI<MDNode>(TempNode));
1485 }
1486 
1487 void LLVMMetadataReplaceAllUsesWith(LLVMMetadataRef TargetMetadata,
1488                                     LLVMMetadataRef Replacement) {
1489   auto *Node = unwrapDI<MDNode>(TargetMetadata);
1490   Node->replaceAllUsesWith(unwrap<Metadata>(Replacement));
1491   MDNode::deleteTemporary(Node);
1492 }
1493 
1494 LLVMMetadataRef LLVMDIBuilderCreateTempGlobalVariableFwdDecl(
1495     LLVMDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
1496     size_t NameLen, const char *Linkage, size_t LnkLen, LLVMMetadataRef File,
1497     unsigned LineNo, LLVMMetadataRef Ty, LLVMBool LocalToUnit,
1498     LLVMMetadataRef Decl, uint32_t AlignInBits) {
1499   return wrap(unwrap(Builder)->createTempGlobalVariableFwdDecl(
1500       unwrapDI<DIScope>(Scope), {Name, NameLen}, {Linkage, LnkLen},
1501       unwrapDI<DIFile>(File), LineNo, unwrapDI<DIType>(Ty), LocalToUnit,
1502       unwrapDI<MDNode>(Decl), nullptr, AlignInBits));
1503 }
1504 
1505 LLVMValueRef
1506 LLVMDIBuilderInsertDeclareBefore(LLVMDIBuilderRef Builder, LLVMValueRef Storage,
1507                                  LLVMMetadataRef VarInfo, LLVMMetadataRef Expr,
1508                                  LLVMMetadataRef DL, LLVMValueRef Instr) {
1509   return wrap(unwrap(Builder)->insertDeclare(
1510                   unwrap(Storage), unwrap<DILocalVariable>(VarInfo),
1511                   unwrap<DIExpression>(Expr), unwrap<DILocation>(DL),
1512                   unwrap<Instruction>(Instr)));
1513 }
1514 
1515 LLVMValueRef LLVMDIBuilderInsertDeclareAtEnd(
1516     LLVMDIBuilderRef Builder, LLVMValueRef Storage, LLVMMetadataRef VarInfo,
1517     LLVMMetadataRef Expr, LLVMMetadataRef DL, LLVMBasicBlockRef Block) {
1518   return wrap(unwrap(Builder)->insertDeclare(
1519                   unwrap(Storage), unwrap<DILocalVariable>(VarInfo),
1520                   unwrap<DIExpression>(Expr), unwrap<DILocation>(DL),
1521                   unwrap(Block)));
1522 }
1523 
1524 LLVMValueRef LLVMDIBuilderInsertDbgValueBefore(LLVMDIBuilderRef Builder,
1525                                                LLVMValueRef Val,
1526                                                LLVMMetadataRef VarInfo,
1527                                                LLVMMetadataRef Expr,
1528                                                LLVMMetadataRef DebugLoc,
1529                                                LLVMValueRef Instr) {
1530   return wrap(unwrap(Builder)->insertDbgValueIntrinsic(
1531                   unwrap(Val), unwrap<DILocalVariable>(VarInfo),
1532                   unwrap<DIExpression>(Expr), unwrap<DILocation>(DebugLoc),
1533                   unwrap<Instruction>(Instr)));
1534 }
1535 
1536 LLVMValueRef LLVMDIBuilderInsertDbgValueAtEnd(LLVMDIBuilderRef Builder,
1537                                               LLVMValueRef Val,
1538                                               LLVMMetadataRef VarInfo,
1539                                               LLVMMetadataRef Expr,
1540                                               LLVMMetadataRef DebugLoc,
1541                                               LLVMBasicBlockRef Block) {
1542   return wrap(unwrap(Builder)->insertDbgValueIntrinsic(
1543                   unwrap(Val), unwrap<DILocalVariable>(VarInfo),
1544                   unwrap<DIExpression>(Expr), unwrap<DILocation>(DebugLoc),
1545                   unwrap(Block)));
1546 }
1547 
1548 LLVMMetadataRef LLVMDIBuilderCreateAutoVariable(
1549     LLVMDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
1550     size_t NameLen, LLVMMetadataRef File, unsigned LineNo, LLVMMetadataRef Ty,
1551     LLVMBool AlwaysPreserve, LLVMDIFlags Flags, uint32_t AlignInBits) {
1552   return wrap(unwrap(Builder)->createAutoVariable(
1553                   unwrap<DIScope>(Scope), {Name, NameLen}, unwrap<DIFile>(File),
1554                   LineNo, unwrap<DIType>(Ty), AlwaysPreserve,
1555                   map_from_llvmDIFlags(Flags), AlignInBits));
1556 }
1557 
1558 LLVMMetadataRef LLVMDIBuilderCreateParameterVariable(
1559     LLVMDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
1560     size_t NameLen, unsigned ArgNo, LLVMMetadataRef File, unsigned LineNo,
1561     LLVMMetadataRef Ty, LLVMBool AlwaysPreserve, LLVMDIFlags Flags) {
1562   return wrap(unwrap(Builder)->createParameterVariable(
1563                   unwrap<DIScope>(Scope), {Name, NameLen}, ArgNo, unwrap<DIFile>(File),
1564                   LineNo, unwrap<DIType>(Ty), AlwaysPreserve,
1565                   map_from_llvmDIFlags(Flags)));
1566 }
1567 
1568 LLVMMetadataRef LLVMDIBuilderGetOrCreateSubrange(LLVMDIBuilderRef Builder,
1569                                                  int64_t Lo, int64_t Count) {
1570   return wrap(unwrap(Builder)->getOrCreateSubrange(Lo, Count));
1571 }
1572 
1573 LLVMMetadataRef LLVMDIBuilderGetOrCreateArray(LLVMDIBuilderRef Builder,
1574                                               LLVMMetadataRef *Data,
1575                                               size_t Length) {
1576   Metadata **DataValue = unwrap(Data);
1577   return wrap(unwrap(Builder)->getOrCreateArray({DataValue, Length}).get());
1578 }
1579 
1580 LLVMMetadataRef LLVMGetSubprogram(LLVMValueRef Func) {
1581   return wrap(unwrap<Function>(Func)->getSubprogram());
1582 }
1583 
1584 void LLVMSetSubprogram(LLVMValueRef Func, LLVMMetadataRef SP) {
1585   unwrap<Function>(Func)->setSubprogram(unwrap<DISubprogram>(SP));
1586 }
1587 
1588 unsigned LLVMDISubprogramGetLine(LLVMMetadataRef Subprogram) {
1589   return unwrapDI<DISubprogram>(Subprogram)->getLine();
1590 }
1591 
1592 LLVMMetadataRef LLVMInstructionGetDebugLoc(LLVMValueRef Inst) {
1593   return wrap(unwrap<Instruction>(Inst)->getDebugLoc().getAsMDNode());
1594 }
1595 
1596 void LLVMInstructionSetDebugLoc(LLVMValueRef Inst, LLVMMetadataRef Loc) {
1597   if (Loc)
1598     unwrap<Instruction>(Inst)->setDebugLoc(DebugLoc(unwrap<MDNode>(Loc)));
1599   else
1600     unwrap<Instruction>(Inst)->setDebugLoc(DebugLoc());
1601 }
1602 
1603 LLVMMetadataKind LLVMGetMetadataKind(LLVMMetadataRef Metadata) {
1604   switch(unwrap(Metadata)->getMetadataID()) {
1605 #define HANDLE_METADATA_LEAF(CLASS) \
1606   case Metadata::CLASS##Kind: \
1607     return (LLVMMetadataKind)LLVM##CLASS##MetadataKind;
1608 #include "llvm/IR/Metadata.def"
1609   default:
1610     return (LLVMMetadataKind)LLVMGenericDINodeMetadataKind;
1611   }
1612 }
1613