1 //===--- CGDebugInfo.h - DebugInfo for LLVM CodeGen -------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This is the source-level debug info generator for llvm translation.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_CLANG_LIB_CODEGEN_CGDEBUGINFO_H
15 #define LLVM_CLANG_LIB_CODEGEN_CGDEBUGINFO_H
17 #include "CGBuilder.h"
18 #include "clang/AST/Expr.h"
19 #include "clang/AST/ExternalASTSource.h"
20 #include "clang/AST/Type.h"
21 #include "clang/Basic/SourceLocation.h"
22 #include "clang/Frontend/CodeGenOptions.h"
23 #include "llvm/ADT/DenseMap.h"
24 #include "llvm/ADT/Optional.h"
25 #include "llvm/IR/DIBuilder.h"
26 #include "llvm/IR/DebugInfo.h"
27 #include "llvm/IR/ValueHandle.h"
28 #include "llvm/Support/Allocator.h"
36 class ClassTemplateSpecializationDecl;
39 class ObjCInterfaceDecl;
46 class CodeGenFunction;
49 /// This class gathers all debug information during compilation and is
50 /// responsible for emitting to llvm globals or pass directly to the
53 friend class ApplyDebugLocation;
54 friend class SaveAndRestoreLocation;
56 const codegenoptions::DebugInfoKind DebugKind;
57 bool DebugTypeExtRefs;
58 llvm::DIBuilder DBuilder;
59 llvm::DICompileUnit *TheCU = nullptr;
60 ModuleMap *ClangModuleMap = nullptr;
61 ExternalASTSource::ASTSourceDescriptor PCHDescriptor;
62 SourceLocation CurLoc;
63 llvm::DIType *VTablePtrType = nullptr;
64 llvm::DIType *ClassTy = nullptr;
65 llvm::DICompositeType *ObjTy = nullptr;
66 llvm::DIType *SelTy = nullptr;
67 #define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
68 llvm::DIType *SingletonId = nullptr;
69 #include "clang/Basic/OpenCLImageTypes.def"
70 llvm::DIType *OCLEventDITy = nullptr;
71 llvm::DIType *OCLClkEventDITy = nullptr;
72 llvm::DIType *OCLQueueDITy = nullptr;
73 llvm::DIType *OCLNDRangeDITy = nullptr;
74 llvm::DIType *OCLReserveIDDITy = nullptr;
76 /// Cache of previously constructed Types.
77 llvm::DenseMap<const void *, llvm::TrackingMDRef> TypeCache;
79 llvm::SmallDenseMap<llvm::StringRef, llvm::StringRef> DebugPrefixMap;
81 struct ObjCInterfaceCacheEntry {
82 const ObjCInterfaceType *Type;
85 ObjCInterfaceCacheEntry(const ObjCInterfaceType *Type, llvm::DIType *Decl,
87 : Type(Type), Decl(Decl), Unit(Unit) {}
90 /// Cache of previously constructed interfaces which may change.
91 llvm::SmallVector<ObjCInterfaceCacheEntry, 32> ObjCInterfaceCache;
93 /// Cache of references to clang modules and precompiled headers.
94 llvm::DenseMap<const Module *, llvm::TrackingMDRef> ModuleCache;
96 /// List of interfaces we want to keep even if orphaned.
97 std::vector<void *> RetainedTypes;
99 /// Cache of forward declared types to RAUW at the end of
101 std::vector<std::pair<const TagType *, llvm::TrackingMDRef>> ReplaceMap;
103 /// Cache of replaceable forward declarations (functions and
104 /// variables) to RAUW at the end of compilation.
105 std::vector<std::pair<const DeclaratorDecl *, llvm::TrackingMDRef>>
108 /// Keep track of our current nested lexical block.
109 std::vector<llvm::TypedTrackingMDRef<llvm::DIScope>> LexicalBlockStack;
110 llvm::DenseMap<const Decl *, llvm::TrackingMDRef> RegionMap;
111 /// Keep track of LexicalBlockStack counter at the beginning of a
112 /// function. This is used to pop unbalanced regions at the end of a
114 std::vector<unsigned> FnBeginRegionCount;
116 /// This is a storage for names that are constructed on demand. For
117 /// example, C++ destructors, C++ operators etc..
118 llvm::BumpPtrAllocator DebugInfoNames;
121 llvm::DenseMap<const char *, llvm::TrackingMDRef> DIFileCache;
122 llvm::DenseMap<const FunctionDecl *, llvm::TrackingMDRef> SPCache;
123 /// Cache declarations relevant to DW_TAG_imported_declarations (C++
124 /// using declarations) that aren't covered by other more specific caches.
125 llvm::DenseMap<const Decl *, llvm::TrackingMDRef> DeclCache;
126 llvm::DenseMap<const NamespaceDecl *, llvm::TrackingMDRef> NameSpaceCache;
127 llvm::DenseMap<const NamespaceAliasDecl *, llvm::TrackingMDRef>
129 llvm::DenseMap<const Decl *, llvm::TypedTrackingMDRef<llvm::DIDerivedType>>
130 StaticDataMemberCache;
132 /// Helper functions for getOrCreateType.
134 /// Currently the checksum of an interface includes the number of
135 /// ivars and property accessors.
136 llvm::DIType *CreateType(const BuiltinType *Ty);
137 llvm::DIType *CreateType(const ComplexType *Ty);
138 llvm::DIType *CreateQualifiedType(QualType Ty, llvm::DIFile *Fg);
139 llvm::DIType *CreateType(const TypedefType *Ty, llvm::DIFile *Fg);
140 llvm::DIType *CreateType(const TemplateSpecializationType *Ty,
142 llvm::DIType *CreateType(const ObjCObjectPointerType *Ty, llvm::DIFile *F);
143 llvm::DIType *CreateType(const PointerType *Ty, llvm::DIFile *F);
144 llvm::DIType *CreateType(const BlockPointerType *Ty, llvm::DIFile *F);
145 llvm::DIType *CreateType(const FunctionType *Ty, llvm::DIFile *F);
146 /// Get structure or union type.
147 llvm::DIType *CreateType(const RecordType *Tyg);
148 llvm::DIType *CreateTypeDefinition(const RecordType *Ty);
149 llvm::DICompositeType *CreateLimitedType(const RecordType *Ty);
150 void CollectContainingType(const CXXRecordDecl *RD,
151 llvm::DICompositeType *CT);
152 /// Get Objective-C interface type.
153 llvm::DIType *CreateType(const ObjCInterfaceType *Ty, llvm::DIFile *F);
154 llvm::DIType *CreateTypeDefinition(const ObjCInterfaceType *Ty,
156 /// Get Objective-C object type.
157 llvm::DIType *CreateType(const ObjCObjectType *Ty, llvm::DIFile *F);
158 llvm::DIType *CreateType(const VectorType *Ty, llvm::DIFile *F);
159 llvm::DIType *CreateType(const ArrayType *Ty, llvm::DIFile *F);
160 llvm::DIType *CreateType(const LValueReferenceType *Ty, llvm::DIFile *F);
161 llvm::DIType *CreateType(const RValueReferenceType *Ty, llvm::DIFile *Unit);
162 llvm::DIType *CreateType(const MemberPointerType *Ty, llvm::DIFile *F);
163 llvm::DIType *CreateType(const AtomicType *Ty, llvm::DIFile *F);
164 llvm::DIType *CreateType(const PipeType *Ty, llvm::DIFile *F);
165 /// Get enumeration type.
166 llvm::DIType *CreateEnumType(const EnumType *Ty);
167 llvm::DIType *CreateTypeDefinition(const EnumType *Ty);
168 /// Look up the completed type for a self pointer in the TypeCache and
169 /// create a copy of it with the ObjectPointer and Artificial flags
170 /// set. If the type is not cached, a new one is created. This should
171 /// never happen though, since creating a type for the implicit self
172 /// argument implies that we already parsed the interface definition
173 /// and the ivar declarations in the implementation.
174 llvm::DIType *CreateSelfType(const QualType &QualTy, llvm::DIType *Ty);
177 /// Get the type from the cache or return null type if it doesn't
179 llvm::DIType *getTypeOrNull(const QualType);
180 /// Return the debug type for a C++ method.
181 /// \arg CXXMethodDecl is of FunctionType. This function type is
182 /// not updated to include implicit \c this pointer. Use this routine
183 /// to get a method type which includes \c this pointer.
184 llvm::DISubroutineType *getOrCreateMethodType(const CXXMethodDecl *Method,
186 llvm::DISubroutineType *
187 getOrCreateInstanceMethodType(QualType ThisPtr, const FunctionProtoType *Func,
189 llvm::DISubroutineType *
190 getOrCreateFunctionType(const Decl *D, QualType FnType, llvm::DIFile *F);
191 /// \return debug info descriptor for vtable.
192 llvm::DIType *getOrCreateVTablePtrType(llvm::DIFile *F);
193 /// \return namespace descriptor for the given namespace decl.
194 llvm::DINamespace *getOrCreateNameSpace(const NamespaceDecl *N);
195 llvm::DIType *CreatePointerLikeType(llvm::dwarf::Tag Tag, const Type *Ty,
196 QualType PointeeTy, llvm::DIFile *F);
197 llvm::DIType *getOrCreateStructPtrType(StringRef Name, llvm::DIType *&Cache);
199 /// A helper function to create a subprogram for a single member
200 /// function GlobalDecl.
201 llvm::DISubprogram *CreateCXXMemberFunction(const CXXMethodDecl *Method,
203 llvm::DIType *RecordTy);
205 /// A helper function to collect debug info for C++ member
206 /// functions. This is used while creating debug info entry for a
208 void CollectCXXMemberFunctions(const CXXRecordDecl *Decl, llvm::DIFile *F,
209 SmallVectorImpl<llvm::Metadata *> &E,
212 /// A helper function to collect debug info for C++ base
213 /// classes. This is used while creating debug info entry for a
215 void CollectCXXBases(const CXXRecordDecl *Decl, llvm::DIFile *F,
216 SmallVectorImpl<llvm::Metadata *> &EltTys,
217 llvm::DIType *RecordTy);
219 /// A helper function to collect template parameters.
220 llvm::DINodeArray CollectTemplateParams(const TemplateParameterList *TPList,
221 ArrayRef<TemplateArgument> TAList,
223 /// A helper function to collect debug info for function template
225 llvm::DINodeArray CollectFunctionTemplateParams(const FunctionDecl *FD,
228 /// A helper function to collect debug info for template
231 CollectCXXTemplateParams(const ClassTemplateSpecializationDecl *TS,
234 llvm::DIType *createFieldType(StringRef name, QualType type,
235 SourceLocation loc, AccessSpecifier AS,
236 uint64_t offsetInBits, llvm::DIFile *tunit,
237 llvm::DIScope *scope,
238 const RecordDecl *RD = nullptr);
240 /// Create new bit field member.
241 llvm::DIType *createBitFieldType(const FieldDecl *BitFieldDecl,
242 llvm::DIScope *RecordTy,
243 const RecordDecl *RD);
245 /// Helpers for collecting fields of a record.
247 void CollectRecordLambdaFields(const CXXRecordDecl *CXXDecl,
248 SmallVectorImpl<llvm::Metadata *> &E,
249 llvm::DIType *RecordTy);
250 llvm::DIDerivedType *CreateRecordStaticField(const VarDecl *Var,
251 llvm::DIType *RecordTy,
252 const RecordDecl *RD);
253 void CollectRecordNormalField(const FieldDecl *Field, uint64_t OffsetInBits,
255 SmallVectorImpl<llvm::Metadata *> &E,
256 llvm::DIType *RecordTy, const RecordDecl *RD);
257 void CollectRecordFields(const RecordDecl *Decl, llvm::DIFile *F,
258 SmallVectorImpl<llvm::Metadata *> &E,
259 llvm::DICompositeType *RecordTy);
261 /// If the C++ class has vtable info then insert appropriate debug
262 /// info entry in EltTys vector.
263 void CollectVTableInfo(const CXXRecordDecl *Decl, llvm::DIFile *F,
264 SmallVectorImpl<llvm::Metadata *> &EltTys);
267 /// Create a new lexical block node and push it on the stack.
268 void CreateLexicalBlock(SourceLocation Loc);
271 CGDebugInfo(CodeGenModule &CGM);
276 /// Module debugging: Support for building PCMs.
278 /// Set the main CU's DwoId field to \p Signature.
279 void setDwoId(uint64_t Signature);
281 /// When generating debug information for a clang module or
282 /// precompiled header, this module map will be used to determine
283 /// the module of origin of each Decl.
284 void setModuleMap(ModuleMap &MMap) { ClangModuleMap = &MMap; }
286 /// When generating debug information for a clang module or
287 /// precompiled header, this module map will be used to determine
288 /// the module of origin of each Decl.
289 void setPCHDescriptor(ExternalASTSource::ASTSourceDescriptor PCH) {
294 /// Update the current source location. If \arg loc is invalid it is
296 void setLocation(SourceLocation Loc);
298 /// Emit metadata to indicate a change in line/column information in
299 /// the source file. If the location is invalid, the previous
300 /// location will be reused.
301 void EmitLocation(CGBuilderTy &Builder, SourceLocation Loc);
303 /// Emit a call to llvm.dbg.function.start to indicate
304 /// start of a new function.
305 /// \param Loc The location of the function header.
306 /// \param ScopeLoc The location of the function body.
307 void EmitFunctionStart(GlobalDecl GD, SourceLocation Loc,
308 SourceLocation ScopeLoc, QualType FnType,
309 llvm::Function *Fn, CGBuilderTy &Builder);
311 /// Emit debug info for a function declaration.
312 void EmitFunctionDecl(GlobalDecl GD, SourceLocation Loc, QualType FnType);
314 /// Constructs the debug code for exiting a function.
315 void EmitFunctionEnd(CGBuilderTy &Builder);
317 /// Emit metadata to indicate the beginning of a new lexical block
318 /// and push the block onto the stack.
319 void EmitLexicalBlockStart(CGBuilderTy &Builder, SourceLocation Loc);
321 /// Emit metadata to indicate the end of a new lexical block and pop
322 /// the current block.
323 void EmitLexicalBlockEnd(CGBuilderTy &Builder, SourceLocation Loc);
325 /// Emit call to \c llvm.dbg.declare for an automatic variable
327 void EmitDeclareOfAutoVariable(const VarDecl *Decl, llvm::Value *AI,
328 CGBuilderTy &Builder);
330 /// Emit call to \c llvm.dbg.declare for an imported variable
331 /// declaration in a block.
332 void EmitDeclareOfBlockDeclRefVariable(const VarDecl *variable,
333 llvm::Value *storage,
334 CGBuilderTy &Builder,
335 const CGBlockInfo &blockInfo,
336 llvm::Instruction *InsertPoint = nullptr);
338 /// Emit call to \c llvm.dbg.declare for an argument variable
340 void EmitDeclareOfArgVariable(const VarDecl *Decl, llvm::Value *AI,
341 unsigned ArgNo, CGBuilderTy &Builder);
343 /// Emit call to \c llvm.dbg.declare for the block-literal argument
344 /// to a block invocation function.
345 void EmitDeclareOfBlockLiteralArgVariable(const CGBlockInfo &block,
346 llvm::Value *Arg, unsigned ArgNo,
347 llvm::Value *LocalAddr,
348 CGBuilderTy &Builder);
350 /// Emit information about a global variable.
351 void EmitGlobalVariable(llvm::GlobalVariable *GV, const VarDecl *Decl);
353 /// Emit global variable's debug info.
354 void EmitGlobalVariable(const ValueDecl *VD, llvm::Constant *Init);
356 /// Emit C++ using directive.
357 void EmitUsingDirective(const UsingDirectiveDecl &UD);
359 /// Emit the type explicitly casted to.
360 void EmitExplicitCastType(QualType Ty);
362 /// Emit C++ using declaration.
363 void EmitUsingDecl(const UsingDecl &UD);
365 /// Emit an @import declaration.
366 void EmitImportDecl(const ImportDecl &ID);
368 /// Emit C++ namespace alias.
369 llvm::DIImportedEntity *EmitNamespaceAlias(const NamespaceAliasDecl &NA);
371 /// Emit record type's standalone debug info.
372 llvm::DIType *getOrCreateRecordType(QualType Ty, SourceLocation L);
374 /// Emit an Objective-C interface type standalone debug info.
375 llvm::DIType *getOrCreateInterfaceType(QualType Ty, SourceLocation Loc);
377 /// Emit standalone debug info for a type.
378 llvm::DIType *getOrCreateStandaloneType(QualType Ty, SourceLocation Loc);
380 void completeType(const EnumDecl *ED);
381 void completeType(const RecordDecl *RD);
382 void completeRequiredType(const RecordDecl *RD);
383 void completeClassData(const RecordDecl *RD);
385 void completeTemplateDefinition(const ClassTemplateSpecializationDecl &SD);
388 /// Emit call to llvm.dbg.declare for a variable declaration.
389 void EmitDeclare(const VarDecl *decl, llvm::Value *AI,
390 llvm::Optional<unsigned> ArgNo, CGBuilderTy &Builder);
392 /// Build up structure info for the byref. See \a BuildByRefType.
393 llvm::DIType *EmitTypeForVarWithBlocksAttr(const VarDecl *VD,
396 /// Get context info for the DeclContext of \p Decl.
397 llvm::DIScope *getDeclContextDescriptor(const Decl *D);
398 /// Get context info for a given DeclContext \p Decl.
399 llvm::DIScope *getContextDescriptor(const Decl *Context,
400 llvm::DIScope *Default);
402 llvm::DIScope *getCurrentContextDescriptor(const Decl *Decl);
404 /// Create a forward decl for a RecordType in a given context.
405 llvm::DICompositeType *getOrCreateRecordFwdDecl(const RecordType *,
408 /// Return current directory name.
409 StringRef getCurrentDirname();
411 /// Create new compile unit.
412 void CreateCompileUnit();
414 /// Remap a given path with the current debug prefix map
415 std::string remapDIPath(StringRef) const;
417 /// Get the file debug info descriptor for the input location.
418 llvm::DIFile *getOrCreateFile(SourceLocation Loc);
420 /// Get the file info for main compile unit.
421 llvm::DIFile *getOrCreateMainFile();
423 /// Get the type from the cache or create a new type if necessary.
424 llvm::DIType *getOrCreateType(QualType Ty, llvm::DIFile *Fg);
426 /// Get a reference to a clang module. If \p CreateSkeletonCU is true,
427 /// this also creates a split dwarf skeleton compile unit.
429 getOrCreateModuleRef(ExternalASTSource::ASTSourceDescriptor Mod,
430 bool CreateSkeletonCU);
432 /// DebugTypeExtRefs: If \p D originated in a clang module, return it.
433 llvm::DIModule *getParentModuleOrNull(const Decl *D);
435 /// Get the type from the cache or create a new partial type if
437 llvm::DICompositeType *getOrCreateLimitedType(const RecordType *Ty,
440 /// Create type metadata for a source language type.
441 llvm::DIType *CreateTypeNode(QualType Ty, llvm::DIFile *Fg);
443 /// Create new member and increase Offset by FType's size.
444 llvm::DIType *CreateMemberType(llvm::DIFile *Unit, QualType FType,
445 StringRef Name, uint64_t *Offset);
447 /// Retrieve the DIDescriptor, if any, for the canonical form of this
449 llvm::DINode *getDeclarationOrDefinition(const Decl *D);
451 /// \return debug info descriptor to describe method
452 /// declaration for the given method definition.
453 llvm::DISubprogram *getFunctionDeclaration(const Decl *D);
455 /// \return debug info descriptor to describe in-class static data
456 /// member declaration for the given out-of-class definition. If D
457 /// is an out-of-class definition of a static data member of a
458 /// class, find its corresponding in-class declaration.
459 llvm::DIDerivedType *
460 getOrCreateStaticDataMemberDeclarationOrNull(const VarDecl *D);
462 /// Create a subprogram describing the forward declaration
463 /// represented in the given FunctionDecl.
464 llvm::DISubprogram *getFunctionForwardDeclaration(const FunctionDecl *FD);
466 /// Create a global variable describing the forward decalration
467 /// represented in the given VarDecl.
468 llvm::DIGlobalVariable *
469 getGlobalVariableForwardDeclaration(const VarDecl *VD);
471 /// \brief Return a global variable that represents one of the
472 /// collection of global variables created for an anonmyous union.
474 /// Recursively collect all of the member fields of a global
475 /// anonymous decl and create static variables for them. The first
476 /// time this is called it needs to be on a union and then from
477 /// there we can have additional unnamed fields.
478 llvm::DIGlobalVariable *
479 CollectAnonRecordDecls(const RecordDecl *RD, llvm::DIFile *Unit,
480 unsigned LineNo, StringRef LinkageName,
481 llvm::GlobalVariable *Var, llvm::DIScope *DContext);
483 /// Get function name for the given FunctionDecl. If the name is
484 /// constructed on demand (e.g., C++ destructor) then the name is
485 /// stored on the side.
486 StringRef getFunctionName(const FunctionDecl *FD);
488 /// Returns the unmangled name of an Objective-C method.
489 /// This is the display name for the debugging info.
490 StringRef getObjCMethodName(const ObjCMethodDecl *FD);
492 /// Return selector name. This is used for debugging
494 StringRef getSelectorName(Selector S);
496 /// Get class name including template argument list.
497 StringRef getClassName(const RecordDecl *RD);
499 /// Get the vtable name for the given class.
500 StringRef getVTableName(const CXXRecordDecl *Decl);
502 /// Get line number for the location. If location is invalid
503 /// then use current location.
504 unsigned getLineNumber(SourceLocation Loc);
506 /// Get column number for the location. If location is
507 /// invalid then use current location.
508 /// \param Force Assume DebugColumnInfo option is true.
509 unsigned getColumnNumber(SourceLocation Loc, bool Force = false);
511 /// Collect various properties of a FunctionDecl.
512 /// \param GD A GlobalDecl whose getDecl() must return a FunctionDecl.
513 void collectFunctionDeclProps(GlobalDecl GD, llvm::DIFile *Unit,
514 StringRef &Name, StringRef &LinkageName,
515 llvm::DIScope *&FDContext,
516 llvm::DINodeArray &TParamsArray,
519 /// Collect various properties of a VarDecl.
520 void collectVarDeclProps(const VarDecl *VD, llvm::DIFile *&Unit,
521 unsigned &LineNo, QualType &T, StringRef &Name,
522 StringRef &LinkageName, llvm::DIScope *&VDContext);
524 /// Allocate a copy of \p A using the DebugInfoNames allocator
525 /// and return a reference to it. If multiple arguments are given the strings
526 /// are concatenated.
527 StringRef internString(StringRef A, StringRef B = StringRef()) {
528 char *Data = DebugInfoNames.Allocate<char>(A.size() + B.size());
530 std::memcpy(Data, A.data(), A.size());
532 std::memcpy(Data + A.size(), B.data(), B.size());
533 return StringRef(Data, A.size() + B.size());
537 /// A scoped helper to set the current debug location to the specified
538 /// location or preferred location of the specified Expr.
539 class ApplyDebugLocation {
541 void init(SourceLocation TemporaryLocation, bool DefaultToEmpty = false);
542 ApplyDebugLocation(CodeGenFunction &CGF, bool DefaultToEmpty,
543 SourceLocation TemporaryLocation);
545 llvm::DebugLoc OriginalLocation;
546 CodeGenFunction *CGF;
549 /// Set the location to the (valid) TemporaryLocation.
550 ApplyDebugLocation(CodeGenFunction &CGF, SourceLocation TemporaryLocation);
551 ApplyDebugLocation(CodeGenFunction &CGF, const Expr *E);
552 ApplyDebugLocation(CodeGenFunction &CGF, llvm::DebugLoc Loc);
553 ApplyDebugLocation(ApplyDebugLocation &&Other) : CGF(Other.CGF) {
557 ~ApplyDebugLocation();
559 /// \brief Apply TemporaryLocation if it is valid. Otherwise switch
560 /// to an artificial debug location that has a valid scope, but no
561 /// line information.
563 /// Artificial locations are useful when emitting compiler-generated
564 /// helper functions that have no source location associated with
565 /// them. The DWARF specification allows the compiler to use the
566 /// special line number 0 to indicate code that can not be
567 /// attributed to any source location. Note that passing an empty
568 /// SourceLocation to CGDebugInfo::setLocation() will result in the
569 /// last valid location being reused.
570 static ApplyDebugLocation CreateArtificial(CodeGenFunction &CGF) {
571 return ApplyDebugLocation(CGF, false, SourceLocation());
573 /// \brief Apply TemporaryLocation if it is valid. Otherwise switch
574 /// to an artificial debug location that has a valid scope, but no
575 /// line information.
576 static ApplyDebugLocation
577 CreateDefaultArtificial(CodeGenFunction &CGF,
578 SourceLocation TemporaryLocation) {
579 return ApplyDebugLocation(CGF, false, TemporaryLocation);
582 /// Set the IRBuilder to not attach debug locations. Note that
583 /// passing an empty SourceLocation to \a CGDebugInfo::setLocation()
584 /// will result in the last valid location being reused. Note that
585 /// all instructions that do not have a location at the beginning of
586 /// a function are counted towards to function prologue.
587 static ApplyDebugLocation CreateEmpty(CodeGenFunction &CGF) {
588 return ApplyDebugLocation(CGF, true, SourceLocation());
593 } // namespace CodeGen
596 #endif // LLVM_CLANG_LIB_CODEGEN_CGDEBUGINFO_H