1 //===--- CGDebugInfo.h - DebugInfo for LLVM CodeGen -------------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This is the source-level debug info generator for llvm translation.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef LLVM_CLANG_LIB_CODEGEN_CGDEBUGINFO_H
15 #define LLVM_CLANG_LIB_CODEGEN_CGDEBUGINFO_H
16 
17 #include "CGBuilder.h"
18 #include "clang/AST/Expr.h"
19 #include "clang/AST/Type.h"
20 #include "clang/Basic/SourceLocation.h"
21 #include "clang/Frontend/CodeGenOptions.h"
22 #include "llvm/ADT/DenseMap.h"
23 #include "llvm/IR/DIBuilder.h"
24 #include "llvm/IR/DebugInfo.h"
25 #include "llvm/IR/ValueHandle.h"
26 #include "llvm/Support/Allocator.h"
27 
28 namespace llvm {
29   class MDNode;
30 }
31 
32 namespace clang {
33   class CXXMethodDecl;
34   class VarDecl;
35   class ObjCInterfaceDecl;
36   class ObjCIvarDecl;
37   class ClassTemplateSpecializationDecl;
38   class GlobalDecl;
39   class UsingDecl;
40 
41 namespace CodeGen {
42   class CodeGenModule;
43   class CodeGenFunction;
44   class CGBlockInfo;
45 
46 /// \brief This class gathers all debug information during compilation
47 /// and is responsible for emitting to llvm globals or pass directly to
48 /// the backend.
49 class CGDebugInfo {
50   friend class ApplyDebugLocation;
51   friend class SaveAndRestoreLocation;
52   CodeGenModule &CGM;
53   const CodeGenOptions::DebugInfoKind DebugKind;
54   llvm::DIBuilder DBuilder;
55   llvm::DICompileUnit TheCU;
56   SourceLocation CurLoc;
57   llvm::DIType VTablePtrType;
58   llvm::DIType ClassTy;
59   llvm::MDCompositeType *ObjTy = nullptr;
60   llvm::DIType SelTy;
61   llvm::DIType OCLImage1dDITy, OCLImage1dArrayDITy, OCLImage1dBufferDITy;
62   llvm::DIType OCLImage2dDITy, OCLImage2dArrayDITy;
63   llvm::DIType OCLImage3dDITy;
64   llvm::DIType OCLEventDITy;
65   llvm::DIType BlockLiteralGeneric;
66 
67   /// \brief Cache of previously constructed Types.
68   llvm::DenseMap<const void *, llvm::TrackingMDRef> TypeCache;
69 
70   struct ObjCInterfaceCacheEntry {
71     const ObjCInterfaceType *Type;
72     llvm::DIType Decl;
73     llvm::DIFile Unit;
ObjCInterfaceCacheEntryObjCInterfaceCacheEntry74     ObjCInterfaceCacheEntry(const ObjCInterfaceType *Type, llvm::DIType Decl,
75                             llvm::DIFile Unit)
76         : Type(Type), Decl(Decl), Unit(Unit) {}
77   };
78 
79   /// \brief Cache of previously constructed interfaces
80   /// which may change.
81   llvm::SmallVector<ObjCInterfaceCacheEntry, 32> ObjCInterfaceCache;
82 
83   /// \brief list of interfaces we want to keep even if orphaned.
84   std::vector<void *> RetainedTypes;
85 
86   /// \brief Cache of forward declared types to RAUW at the end of
87   /// compilation.
88   std::vector<std::pair<const TagType *, llvm::TrackingMDRef>> ReplaceMap;
89 
90   /// \brief Cache of replaceable forward declarartions (functions and
91   /// variables) to RAUW at the end of compilation.
92   std::vector<std::pair<const DeclaratorDecl *, llvm::TrackingMDRef>>
93       FwdDeclReplaceMap;
94 
95   // LexicalBlockStack - Keep track of our current nested lexical block.
96   std::vector<llvm::TrackingMDNodeRef> LexicalBlockStack;
97   llvm::DenseMap<const Decl *, llvm::TrackingMDRef> RegionMap;
98   // FnBeginRegionCount - Keep track of LexicalBlockStack counter at the
99   // beginning of a function. This is used to pop unbalanced regions at
100   // the end of a function.
101   std::vector<unsigned> FnBeginRegionCount;
102 
103   /// \brief This is a storage for names that are
104   /// constructed on demand. For example, C++ destructors, C++ operators etc..
105   llvm::BumpPtrAllocator DebugInfoNames;
106   StringRef CWDName;
107 
108   llvm::DenseMap<const char *, llvm::TrackingMDRef> DIFileCache;
109   llvm::DenseMap<const FunctionDecl *, llvm::TrackingMDRef> SPCache;
110   /// \brief Cache declarations relevant to DW_TAG_imported_declarations (C++
111   /// using declarations) that aren't covered by other more specific caches.
112   llvm::DenseMap<const Decl *, llvm::TrackingMDRef> DeclCache;
113   llvm::DenseMap<const NamespaceDecl *, llvm::TrackingMDRef> NameSpaceCache;
114   llvm::DenseMap<const NamespaceAliasDecl *, llvm::TrackingMDRef>
115       NamespaceAliasCache;
116   llvm::DenseMap<const Decl *, llvm::TrackingMDRef> StaticDataMemberCache;
117 
118   /// Helper functions for getOrCreateType.
119   unsigned Checksum(const ObjCInterfaceDecl *InterfaceDecl);
120   llvm::DIType CreateType(const BuiltinType *Ty);
121   llvm::DIType CreateType(const ComplexType *Ty);
122   llvm::DIType CreateQualifiedType(QualType Ty, llvm::DIFile Fg);
123   llvm::DIType CreateType(const TypedefType *Ty, llvm::DIFile Fg);
124   llvm::DIType CreateType(const TemplateSpecializationType *Ty, llvm::DIFile Fg);
125   llvm::DIType CreateType(const ObjCObjectPointerType *Ty,
126                           llvm::DIFile F);
127   llvm::DIType CreateType(const PointerType *Ty, llvm::DIFile F);
128   llvm::DIType CreateType(const BlockPointerType *Ty, llvm::DIFile F);
129   llvm::DIType CreateType(const FunctionType *Ty, llvm::DIFile F);
130   llvm::DIType CreateType(const RecordType *Tyg);
131   llvm::DIType CreateTypeDefinition(const RecordType *Ty);
132   llvm::MDCompositeType *CreateLimitedType(const RecordType *Ty);
133   void CollectContainingType(const CXXRecordDecl *RD,
134                              llvm::MDCompositeType *CT);
135   llvm::DIType CreateType(const ObjCInterfaceType *Ty, llvm::DIFile F);
136   llvm::DIType CreateTypeDefinition(const ObjCInterfaceType *Ty, llvm::DIFile F);
137   llvm::DIType CreateType(const ObjCObjectType *Ty, llvm::DIFile F);
138   llvm::DIType CreateType(const VectorType *Ty, llvm::DIFile F);
139   llvm::DIType CreateType(const ArrayType *Ty, llvm::DIFile F);
140   llvm::DIType CreateType(const LValueReferenceType *Ty, llvm::DIFile F);
141   llvm::DIType CreateType(const RValueReferenceType *Ty, llvm::DIFile Unit);
142   llvm::DIType CreateType(const MemberPointerType *Ty, llvm::DIFile F);
143   llvm::DIType CreateType(const AtomicType *Ty, llvm::DIFile F);
144   llvm::DIType CreateEnumType(const EnumType *Ty);
145   llvm::DIType CreateTypeDefinition(const EnumType *Ty);
146   llvm::DIType CreateSelfType(const QualType &QualTy, llvm::DIType Ty);
147   llvm::DIType getTypeOrNull(const QualType);
148   llvm::MDSubroutineType *getOrCreateMethodType(const CXXMethodDecl *Method,
149                                                 llvm::DIFile F);
150   llvm::MDSubroutineType *
151   getOrCreateInstanceMethodType(QualType ThisPtr, const FunctionProtoType *Func,
152                                 llvm::DIFile Unit);
153   llvm::MDSubroutineType *
154   getOrCreateFunctionType(const Decl *D, QualType FnType, llvm::DIFile F);
155   llvm::DIType getOrCreateVTablePtrType(llvm::DIFile F);
156   llvm::DINameSpace getOrCreateNameSpace(const NamespaceDecl *N);
157   llvm::DIType getOrCreateTypeDeclaration(QualType PointeeTy, llvm::DIFile F);
158   llvm::DIType CreatePointerLikeType(llvm::dwarf::Tag Tag,
159                                      const Type *Ty, QualType PointeeTy,
160                                      llvm::DIFile F);
161 
162   llvm::Value *getCachedInterfaceTypeOrNull(const QualType Ty);
163   llvm::DIType getOrCreateStructPtrType(StringRef Name, llvm::DIType &Cache);
164 
165   llvm::DISubprogram CreateCXXMemberFunction(const CXXMethodDecl *Method,
166                                              llvm::DIFile F,
167                                              llvm::DIType RecordTy);
168 
169   void CollectCXXMemberFunctions(const CXXRecordDecl *Decl, llvm::DIFile F,
170                                  SmallVectorImpl<llvm::Metadata *> &E,
171                                  llvm::DIType T);
172 
173   void CollectCXXBases(const CXXRecordDecl *Decl, llvm::DIFile F,
174                        SmallVectorImpl<llvm::Metadata *> &EltTys,
175                        llvm::DIType RecordTy);
176 
177   llvm::DIArray
178   CollectTemplateParams(const TemplateParameterList *TPList,
179                         ArrayRef<TemplateArgument> TAList,
180                         llvm::DIFile Unit);
181   llvm::DIArray
182   CollectFunctionTemplateParams(const FunctionDecl *FD, llvm::DIFile Unit);
183   llvm::DIArray
184   CollectCXXTemplateParams(const ClassTemplateSpecializationDecl *TS,
185                            llvm::DIFile F);
186 
187   llvm::DIType createFieldType(StringRef name, QualType type,
188                                uint64_t sizeInBitsOverride, SourceLocation loc,
189                                AccessSpecifier AS,
190                                uint64_t offsetInBits,
191                                llvm::DIFile tunit,
192                                llvm::DIScope scope,
193                                const RecordDecl* RD = nullptr);
194 
195   // Helpers for collecting fields of a record.
196   void CollectRecordLambdaFields(const CXXRecordDecl *CXXDecl,
197                                  SmallVectorImpl<llvm::Metadata *> &E,
198                                  llvm::DIType RecordTy);
199   llvm::DIDerivedType CreateRecordStaticField(const VarDecl *Var,
200                                               llvm::DIType RecordTy,
201                                               const RecordDecl* RD);
202   void CollectRecordNormalField(const FieldDecl *Field, uint64_t OffsetInBits,
203                                 llvm::DIFile F,
204                                 SmallVectorImpl<llvm::Metadata *> &E,
205                                 llvm::DIType RecordTy, const RecordDecl *RD);
206   void CollectRecordFields(const RecordDecl *Decl, llvm::DIFile F,
207                            SmallVectorImpl<llvm::Metadata *> &E,
208                            llvm::DICompositeType RecordTy);
209 
210   void CollectVTableInfo(const CXXRecordDecl *Decl, llvm::DIFile F,
211                          SmallVectorImpl<llvm::Metadata *> &EltTys);
212 
213   // CreateLexicalBlock - Create a new lexical block node and push it on
214   // the stack.
215   void CreateLexicalBlock(SourceLocation Loc);
216 
217 public:
218   CGDebugInfo(CodeGenModule &CGM);
219   ~CGDebugInfo();
220 
221   void finalize();
222 
223   /// \brief Update the current source location. If \arg loc is
224   /// invalid it is ignored.
225   void setLocation(SourceLocation Loc);
226 
227   /// \brief Emit metadata to indicate a change in line/column
228   /// information in the source file.
229   void EmitLocation(CGBuilderTy &Builder, SourceLocation Loc);
230 
231   /// \brief Emit a call to llvm.dbg.function.start to indicate
232   /// start of a new function.
233   /// \param Loc       The location of the function header.
234   /// \param ScopeLoc  The location of the function body.
235   void EmitFunctionStart(GlobalDecl GD,
236                          SourceLocation Loc, SourceLocation ScopeLoc,
237                          QualType FnType, llvm::Function *Fn,
238                          CGBuilderTy &Builder);
239 
240   /// \brief Constructs the debug code for exiting a function.
241   void EmitFunctionEnd(CGBuilderTy &Builder);
242 
243   /// \brief Emit metadata to indicate the beginning of a
244   /// new lexical block and push the block onto the stack.
245   void EmitLexicalBlockStart(CGBuilderTy &Builder, SourceLocation Loc);
246 
247   /// \brief Emit metadata to indicate the end of a new lexical
248   /// block and pop the current block.
249   void EmitLexicalBlockEnd(CGBuilderTy &Builder, SourceLocation Loc);
250 
251   /// \brief Emit call to llvm.dbg.declare for an automatic
252   /// variable declaration.
253   void EmitDeclareOfAutoVariable(const VarDecl *Decl, llvm::Value *AI,
254                                  CGBuilderTy &Builder);
255 
256   /// \brief Emit call to llvm.dbg.declare for an
257   /// imported variable declaration in a block.
258   void EmitDeclareOfBlockDeclRefVariable(const VarDecl *variable,
259                                          llvm::Value *storage,
260                                          CGBuilderTy &Builder,
261                                          const CGBlockInfo &blockInfo,
262                                          llvm::Instruction *InsertPoint = 0);
263 
264   /// \brief Emit call to llvm.dbg.declare for an argument
265   /// variable declaration.
266   void EmitDeclareOfArgVariable(const VarDecl *Decl, llvm::Value *AI,
267                                 unsigned ArgNo, CGBuilderTy &Builder);
268 
269   /// \brief Emit call to
270   /// llvm.dbg.declare for the block-literal argument to a block
271   /// invocation function.
272   void EmitDeclareOfBlockLiteralArgVariable(const CGBlockInfo &block,
273                                             llvm::Value *Arg, unsigned ArgNo,
274                                             llvm::Value *LocalAddr,
275                                             CGBuilderTy &Builder);
276 
277   /// \brief Emit information about a global variable.
278   void EmitGlobalVariable(llvm::GlobalVariable *GV, const VarDecl *Decl);
279 
280   /// \brief Emit global variable's debug info.
281   void EmitGlobalVariable(const ValueDecl *VD, llvm::Constant *Init);
282 
283   /// \brief Emit C++ using directive.
284   void EmitUsingDirective(const UsingDirectiveDecl &UD);
285 
286   /// \brief Emit the type explicitly casted to.
287   void EmitExplicitCastType(QualType Ty);
288 
289   /// \brief Emit C++ using declaration.
290   void EmitUsingDecl(const UsingDecl &UD);
291 
292   /// \brief Emit C++ namespace alias.
293   llvm::DIImportedEntity EmitNamespaceAlias(const NamespaceAliasDecl &NA);
294 
295   /// \brief Emit record type's standalone debug info.
296   llvm::DIType getOrCreateRecordType(QualType Ty, SourceLocation L);
297 
298   /// \brief Emit an objective c interface type standalone
299   /// debug info.
300   llvm::DIType getOrCreateInterfaceType(QualType Ty,
301                                         SourceLocation Loc);
302 
303   void completeType(const EnumDecl *ED);
304   void completeType(const RecordDecl *RD);
305   void completeRequiredType(const RecordDecl *RD);
306   void completeClassData(const RecordDecl *RD);
307 
308   void completeTemplateDefinition(const ClassTemplateSpecializationDecl &SD);
309 
310 private:
311   /// \brief Emit call to llvm.dbg.declare for a variable declaration.
312   /// Tag accepts custom types DW_TAG_arg_variable and DW_TAG_auto_variable,
313   /// otherwise would be of type llvm::dwarf::Tag.
314   void EmitDeclare(const VarDecl *decl, llvm::dwarf::Tag Tag, llvm::Value *AI,
315                    unsigned ArgNo, CGBuilderTy &Builder);
316 
317   // EmitTypeForVarWithBlocksAttr - Build up structure info for the byref.
318   // See BuildByRefType.
319   llvm::DIType EmitTypeForVarWithBlocksAttr(const VarDecl *VD,
320                                             uint64_t *OffSet);
321 
322   /// \brief Get context info for the decl.
323   llvm::DIScope getContextDescriptor(const Decl *Decl);
324 
325   llvm::DIScope getCurrentContextDescriptor(const Decl *Decl);
326 
327   /// \brief Create a forward decl for a RecordType in a given context.
328   llvm::MDCompositeType *getOrCreateRecordFwdDecl(const RecordType *,
329                                                   llvm::MDScope *);
330 
331   /// \brief Create a set of decls for the context chain.
332   llvm::DIDescriptor createContextChain(const Decl *Decl);
333 
334   /// \brief Return current directory name.
335   StringRef getCurrentDirname();
336 
337   /// \brief Create new compile unit.
338   void CreateCompileUnit();
339 
340   /// \brief Get the file debug info descriptor for the input
341   /// location.
342   llvm::DIFile getOrCreateFile(SourceLocation Loc);
343 
344   /// \brief Get the file info for main compile unit.
345   llvm::DIFile getOrCreateMainFile();
346 
347   /// \brief Get the type from the cache or create a new type if
348   /// necessary.
349   llvm::DIType getOrCreateType(QualType Ty, llvm::DIFile Fg);
350 
351   /// \brief Get the type from the cache or create a new
352   /// partial type if necessary.
353   llvm::DIType getOrCreateLimitedType(const RecordType *Ty, llvm::DIFile F);
354 
355   /// \brief Create type metadata for a source language type.
356   llvm::DIType CreateTypeNode(QualType Ty, llvm::DIFile Fg);
357 
358   /// \brief return the underlying ObjCInterfaceDecl
359   /// if Ty is an ObjCInterface or a pointer to one.
360   ObjCInterfaceDecl* getObjCInterfaceDecl(QualType Ty);
361 
362   /// \brief Create new member and increase Offset by FType's size.
363   llvm::DIType CreateMemberType(llvm::DIFile Unit, QualType FType,
364                                 StringRef Name, uint64_t *Offset);
365 
366   /// \brief Retrieve the DIDescriptor, if any, for the canonical form of this
367   /// declaration.
368   llvm::DebugNode *getDeclarationOrDefinition(const Decl *D);
369 
370   /// \brief Return debug info descriptor to describe method
371   /// declaration for the given method definition.
372   llvm::DISubprogram getFunctionDeclaration(const Decl *D);
373 
374   /// Return debug info descriptor to describe in-class static data member
375   /// declaration for the given out-of-class definition.
376   llvm::DIDerivedType
377   getOrCreateStaticDataMemberDeclarationOrNull(const VarDecl *D);
378 
379   /// \brief Create a DISubprogram describing the forward
380   /// decalration represented in the given FunctionDecl.
381   llvm::DISubprogram getFunctionForwardDeclaration(const FunctionDecl *FD);
382 
383   /// \brief Create a DIGlobalVariable describing the forward
384   /// decalration represented in the given VarDecl.
385   llvm::DIGlobalVariable getGlobalVariableForwardDeclaration(const VarDecl *VD);
386 
387   /// Return a global variable that represents one of the collection of
388   /// global variables created for an anonmyous union.
389   llvm::DIGlobalVariable
390   CollectAnonRecordDecls(const RecordDecl *RD, llvm::DIFile Unit,
391                          unsigned LineNo, StringRef LinkageName,
392                          llvm::GlobalVariable *Var, llvm::MDScope *DContext);
393 
394   /// \brief Get function name for the given FunctionDecl. If the
395   /// name is constructed on demand (e.g. C++ destructor) then the name
396   /// is stored on the side.
397   StringRef getFunctionName(const FunctionDecl *FD);
398 
399   /// \brief Returns the unmangled name of an Objective-C method.
400   /// This is the display name for the debugging info.
401   StringRef getObjCMethodName(const ObjCMethodDecl *FD);
402 
403   /// \brief Return selector name. This is used for debugging
404   /// info.
405   StringRef getSelectorName(Selector S);
406 
407   /// \brief Get class name including template argument list.
408   StringRef getClassName(const RecordDecl *RD);
409 
410   /// \brief Get vtable name for the given Class.
411   StringRef getVTableName(const CXXRecordDecl *Decl);
412 
413   /// \brief Get line number for the location. If location is invalid
414   /// then use current location.
415   unsigned getLineNumber(SourceLocation Loc);
416 
417   /// \brief Get column number for the location. If location is
418   /// invalid then use current location.
419   /// \param Force  Assume DebugColumnInfo option is true.
420   unsigned getColumnNumber(SourceLocation Loc, bool Force=false);
421 
422   /// \brief Collect various properties of a FunctionDecl.
423   /// \param GD  A GlobalDecl whose getDecl() must return a FunctionDecl.
424   void collectFunctionDeclProps(GlobalDecl GD, llvm::DIFile Unit,
425                                 StringRef &Name, StringRef &LinkageName,
426                                 llvm::MDScope *&FDContext,
427                                 llvm::DIArray &TParamsArray, unsigned &Flags);
428 
429   /// \brief Collect various properties of a VarDecl.
430   void collectVarDeclProps(const VarDecl *VD, llvm::DIFile &Unit,
431                            unsigned &LineNo, QualType &T, StringRef &Name,
432                            StringRef &LinkageName, llvm::MDScope *&VDContext);
433 
434   /// \brief Allocate a copy of \p A using the DebugInfoNames allocator
435   /// and return a reference to it. If multiple arguments are given the strings
436   /// are concatenated.
437   StringRef internString(StringRef A, StringRef B = StringRef()) {
438     char *Data = DebugInfoNames.Allocate<char>(A.size() + B.size());
439     std::memcpy(Data, A.data(), A.size());
440     std::memcpy(Data + A.size(), B.data(), B.size());
441     return StringRef(Data, A.size() + B.size());
442   }
443 };
444 
445 /// \brief A scoped helper to set the current debug location to the specified
446 /// location or preferred location of the specified Expr.
447 class ApplyDebugLocation {
448 private:
449   void init(SourceLocation TemporaryLocation, bool DefaultToEmpty = false);
450   ApplyDebugLocation(CodeGenFunction &CGF, bool DefaultToEmpty,
451                      SourceLocation TemporaryLocation);
452 
453   llvm::DebugLoc OriginalLocation;
454   CodeGenFunction &CGF;
455 public:
456 
457   /// \brief Set the location to the (valid) TemporaryLocation.
458   ApplyDebugLocation(CodeGenFunction &CGF, SourceLocation TemporaryLocation);
459   ApplyDebugLocation(CodeGenFunction &CGF, const Expr *E);
460   ApplyDebugLocation(CodeGenFunction &CGF, llvm::DebugLoc Loc);
461 
462   ~ApplyDebugLocation();
463 
464   /// \brief Apply TemporaryLocation if it is valid. Otherwise switch to an
465   /// artificial debug location that has a valid scope, but no line information.
466   ///
467   /// Artificial locations are useful when emitting compiler-generated helper
468   /// functions that have no source location associated with them. The DWARF
469   /// specification allows the compiler to use the special line number 0 to
470   /// indicate code that can not be attributed to any source location. Note that
471   /// passing an empty SourceLocation to CGDebugInfo::setLocation() will result
472   /// in the last valid location being reused.
CreateArtificial(CodeGenFunction & CGF)473   static ApplyDebugLocation CreateArtificial(CodeGenFunction &CGF) {
474     return ApplyDebugLocation(CGF, false, SourceLocation());
475   }
476   /// \brief Apply TemporaryLocation if it is valid. Otherwise switch to an
477   /// artificial debug location that has a valid scope, but no line information.
CreateDefaultArtificial(CodeGenFunction & CGF,SourceLocation TemporaryLocation)478   static ApplyDebugLocation CreateDefaultArtificial(CodeGenFunction &CGF,
479                                              SourceLocation TemporaryLocation) {
480     return ApplyDebugLocation(CGF, false, TemporaryLocation);
481   }
482 
483   /// \brief Set the IRBuilder to not attach debug locations.  Note that passing
484   /// an empty SourceLocation to CGDebugInfo::setLocation() will result in the
485   /// last valid location being reused.  Note that all instructions that do not
486   /// have a location at the beginning of a function are counted towards to
487   /// funciton prologue.
CreateEmpty(CodeGenFunction & CGF)488   static ApplyDebugLocation CreateEmpty(CodeGenFunction &CGF) {
489     return ApplyDebugLocation(CGF, true, SourceLocation());
490   }
491 
492   /// \brief Apply TemporaryLocation if it is valid. Otherwise set the IRBuilder
493   /// to not attach debug locations.
CreateDefaultEmpty(CodeGenFunction & CGF,SourceLocation TemporaryLocation)494   static ApplyDebugLocation CreateDefaultEmpty(CodeGenFunction &CGF,
495                                              SourceLocation TemporaryLocation) {
496     return ApplyDebugLocation(CGF, true, TemporaryLocation);
497   }
498 
499 };
500 
501 
502 } // namespace CodeGen
503 } // namespace clang
504 
505 
506 #endif
507