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/DeclCXX.h"
19 #include "clang/AST/Expr.h"
20 #include "clang/AST/ExternalASTSource.h"
21 #include "clang/AST/Type.h"
22 #include "clang/AST/TypeOrdering.h"
23 #include "clang/Basic/SourceLocation.h"
24 #include "clang/Frontend/CodeGenOptions.h"
25 #include "llvm/ADT/DenseMap.h"
26 #include "llvm/ADT/DenseSet.h"
27 #include "llvm/ADT/Optional.h"
28 #include "llvm/IR/DIBuilder.h"
29 #include "llvm/IR/DebugInfo.h"
30 #include "llvm/IR/ValueHandle.h"
31 #include "llvm/Support/Allocator.h"
38 class ClassTemplateSpecializationDecl;
41 class ObjCInterfaceDecl;
48 class CodeGenFunction;
51 /// This class gathers all debug information during compilation and is
52 /// responsible for emitting to llvm globals or pass directly to the
55 friend class ApplyDebugLocation;
56 friend class SaveAndRestoreLocation;
58 const codegenoptions::DebugInfoKind DebugKind;
59 bool DebugTypeExtRefs;
60 llvm::DIBuilder DBuilder;
61 llvm::DICompileUnit *TheCU = nullptr;
62 ModuleMap *ClangModuleMap = nullptr;
63 ExternalASTSource::ASTSourceDescriptor PCHDescriptor;
64 SourceLocation CurLoc;
65 llvm::MDNode *CurInlinedAt = nullptr;
66 llvm::DIType *VTablePtrType = nullptr;
67 llvm::DIType *ClassTy = nullptr;
68 llvm::DICompositeType *ObjTy = nullptr;
69 llvm::DIType *SelTy = nullptr;
70 #define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
71 llvm::DIType *SingletonId = nullptr;
72 #include "clang/Basic/OpenCLImageTypes.def"
73 llvm::DIType *OCLSamplerDITy = nullptr;
74 llvm::DIType *OCLEventDITy = nullptr;
75 llvm::DIType *OCLClkEventDITy = nullptr;
76 llvm::DIType *OCLQueueDITy = nullptr;
77 llvm::DIType *OCLNDRangeDITy = nullptr;
78 llvm::DIType *OCLReserveIDDITy = nullptr;
80 /// Cache of previously constructed Types.
81 llvm::DenseMap<const void *, llvm::TrackingMDRef> TypeCache;
83 llvm::SmallDenseMap<llvm::StringRef, llvm::StringRef> DebugPrefixMap;
85 /// Cache that maps VLA types to size expressions for that type,
86 /// represented by instantiated Metadata nodes.
87 llvm::SmallDenseMap<QualType, llvm::Metadata *> SizeExprCache;
89 struct ObjCInterfaceCacheEntry {
90 const ObjCInterfaceType *Type;
93 ObjCInterfaceCacheEntry(const ObjCInterfaceType *Type, llvm::DIType *Decl,
95 : Type(Type), Decl(Decl), Unit(Unit) {}
98 /// Cache of previously constructed interfaces which may change.
99 llvm::SmallVector<ObjCInterfaceCacheEntry, 32> ObjCInterfaceCache;
101 /// Cache of forward declarations for methods belonging to the interface.
102 llvm::DenseMap<const ObjCInterfaceDecl *, std::vector<llvm::DISubprogram *>>
105 /// Cache of references to clang modules and precompiled headers.
106 llvm::DenseMap<const Module *, llvm::TrackingMDRef> ModuleCache;
108 /// List of interfaces we want to keep even if orphaned.
109 std::vector<void *> RetainedTypes;
111 /// Cache of forward declared types to RAUW at the end of compilation.
112 std::vector<std::pair<const TagType *, llvm::TrackingMDRef>> ReplaceMap;
114 /// Cache of replaceable forward declarations (functions and
115 /// variables) to RAUW at the end of compilation.
116 std::vector<std::pair<const DeclaratorDecl *, llvm::TrackingMDRef>>
119 /// Keep track of our current nested lexical block.
120 std::vector<llvm::TypedTrackingMDRef<llvm::DIScope>> LexicalBlockStack;
121 llvm::DenseMap<const Decl *, llvm::TrackingMDRef> RegionMap;
122 /// Keep track of LexicalBlockStack counter at the beginning of a
123 /// function. This is used to pop unbalanced regions at the end of a
125 std::vector<unsigned> FnBeginRegionCount;
127 /// This is a storage for names that are constructed on demand. For
128 /// example, C++ destructors, C++ operators etc..
129 llvm::BumpPtrAllocator DebugInfoNames;
132 llvm::DenseMap<const char *, llvm::TrackingMDRef> DIFileCache;
133 llvm::DenseMap<const FunctionDecl *, llvm::TrackingMDRef> SPCache;
134 /// Cache declarations relevant to DW_TAG_imported_declarations (C++
135 /// using declarations) that aren't covered by other more specific caches.
136 llvm::DenseMap<const Decl *, llvm::TrackingMDRef> DeclCache;
137 llvm::DenseMap<const NamespaceDecl *, llvm::TrackingMDRef> NamespaceCache;
138 llvm::DenseMap<const NamespaceAliasDecl *, llvm::TrackingMDRef>
140 llvm::DenseMap<const Decl *, llvm::TypedTrackingMDRef<llvm::DIDerivedType>>
141 StaticDataMemberCache;
143 /// Helper functions for getOrCreateType.
145 /// Currently the checksum of an interface includes the number of
146 /// ivars and property accessors.
147 llvm::DIType *CreateType(const BuiltinType *Ty);
148 llvm::DIType *CreateType(const ComplexType *Ty);
149 llvm::DIType *CreateQualifiedType(QualType Ty, llvm::DIFile *Fg);
150 llvm::DIType *CreateType(const TypedefType *Ty, llvm::DIFile *Fg);
151 llvm::DIType *CreateType(const TemplateSpecializationType *Ty,
153 llvm::DIType *CreateType(const ObjCObjectPointerType *Ty, llvm::DIFile *F);
154 llvm::DIType *CreateType(const PointerType *Ty, llvm::DIFile *F);
155 llvm::DIType *CreateType(const BlockPointerType *Ty, llvm::DIFile *F);
156 llvm::DIType *CreateType(const FunctionType *Ty, llvm::DIFile *F);
157 /// Get structure or union type.
158 llvm::DIType *CreateType(const RecordType *Tyg);
159 llvm::DIType *CreateTypeDefinition(const RecordType *Ty);
160 llvm::DICompositeType *CreateLimitedType(const RecordType *Ty);
161 void CollectContainingType(const CXXRecordDecl *RD,
162 llvm::DICompositeType *CT);
163 /// Get Objective-C interface type.
164 llvm::DIType *CreateType(const ObjCInterfaceType *Ty, llvm::DIFile *F);
165 llvm::DIType *CreateTypeDefinition(const ObjCInterfaceType *Ty,
167 /// Get Objective-C object type.
168 llvm::DIType *CreateType(const ObjCObjectType *Ty, llvm::DIFile *F);
169 llvm::DIType *CreateType(const ObjCTypeParamType *Ty, llvm::DIFile *Unit);
171 llvm::DIType *CreateType(const VectorType *Ty, llvm::DIFile *F);
172 llvm::DIType *CreateType(const ArrayType *Ty, llvm::DIFile *F);
173 llvm::DIType *CreateType(const LValueReferenceType *Ty, llvm::DIFile *F);
174 llvm::DIType *CreateType(const RValueReferenceType *Ty, llvm::DIFile *Unit);
175 llvm::DIType *CreateType(const MemberPointerType *Ty, llvm::DIFile *F);
176 llvm::DIType *CreateType(const AtomicType *Ty, llvm::DIFile *F);
177 llvm::DIType *CreateType(const PipeType *Ty, llvm::DIFile *F);
178 /// Get enumeration type.
179 llvm::DIType *CreateEnumType(const EnumType *Ty);
180 llvm::DIType *CreateTypeDefinition(const EnumType *Ty);
181 /// Look up the completed type for a self pointer in the TypeCache and
182 /// create a copy of it with the ObjectPointer and Artificial flags
183 /// set. If the type is not cached, a new one is created. This should
184 /// never happen though, since creating a type for the implicit self
185 /// argument implies that we already parsed the interface definition
186 /// and the ivar declarations in the implementation.
187 llvm::DIType *CreateSelfType(const QualType &QualTy, llvm::DIType *Ty);
190 /// Get the type from the cache or return null type if it doesn't
192 llvm::DIType *getTypeOrNull(const QualType);
193 /// Return the debug type for a C++ method.
194 /// \arg CXXMethodDecl is of FunctionType. This function type is
195 /// not updated to include implicit \c this pointer. Use this routine
196 /// to get a method type which includes \c this pointer.
197 llvm::DISubroutineType *getOrCreateMethodType(const CXXMethodDecl *Method,
199 llvm::DISubroutineType *
200 getOrCreateInstanceMethodType(QualType ThisPtr, const FunctionProtoType *Func,
202 llvm::DISubroutineType *
203 getOrCreateFunctionType(const Decl *D, QualType FnType, llvm::DIFile *F);
204 /// \return debug info descriptor for vtable.
205 llvm::DIType *getOrCreateVTablePtrType(llvm::DIFile *F);
207 /// \return namespace descriptor for the given namespace decl.
208 llvm::DINamespace *getOrCreateNamespace(const NamespaceDecl *N);
209 llvm::DIType *CreatePointerLikeType(llvm::dwarf::Tag Tag, const Type *Ty,
210 QualType PointeeTy, llvm::DIFile *F);
211 llvm::DIType *getOrCreateStructPtrType(StringRef Name, llvm::DIType *&Cache);
213 /// A helper function to create a subprogram for a single member
214 /// function GlobalDecl.
215 llvm::DISubprogram *CreateCXXMemberFunction(const CXXMethodDecl *Method,
217 llvm::DIType *RecordTy);
219 /// A helper function to collect debug info for C++ member
220 /// functions. This is used while creating debug info entry for a
222 void CollectCXXMemberFunctions(const CXXRecordDecl *Decl, llvm::DIFile *F,
223 SmallVectorImpl<llvm::Metadata *> &E,
226 /// A helper function to collect debug info for C++ base
227 /// classes. This is used while creating debug info entry for a
229 void CollectCXXBases(const CXXRecordDecl *Decl, llvm::DIFile *F,
230 SmallVectorImpl<llvm::Metadata *> &EltTys,
231 llvm::DIType *RecordTy);
233 /// Helper function for CollectCXXBases.
234 /// Adds debug info entries for types in Bases that are not in SeenTypes.
235 void CollectCXXBasesAux(
236 const CXXRecordDecl *RD, llvm::DIFile *Unit,
237 SmallVectorImpl<llvm::Metadata *> &EltTys, llvm::DIType *RecordTy,
238 const CXXRecordDecl::base_class_const_range &Bases,
239 llvm::DenseSet<CanonicalDeclPtr<const CXXRecordDecl>> &SeenTypes,
240 llvm::DINode::DIFlags StartingFlags);
242 /// A helper function to collect template parameters.
243 llvm::DINodeArray CollectTemplateParams(const TemplateParameterList *TPList,
244 ArrayRef<TemplateArgument> TAList,
246 /// A helper function to collect debug info for function template
248 llvm::DINodeArray CollectFunctionTemplateParams(const FunctionDecl *FD,
251 /// A helper function to collect debug info for template
254 CollectCXXTemplateParams(const ClassTemplateSpecializationDecl *TS,
257 llvm::DIType *createFieldType(StringRef name, QualType type,
258 SourceLocation loc, AccessSpecifier AS,
259 uint64_t offsetInBits, uint32_t AlignInBits,
260 llvm::DIFile *tunit, llvm::DIScope *scope,
261 const RecordDecl *RD = nullptr);
263 llvm::DIType *createFieldType(StringRef name, QualType type,
264 SourceLocation loc, AccessSpecifier AS,
265 uint64_t offsetInBits, llvm::DIFile *tunit,
266 llvm::DIScope *scope,
267 const RecordDecl *RD = nullptr) {
268 return createFieldType(name, type, loc, AS, offsetInBits, 0, tunit, scope,
272 /// Create new bit field member.
273 llvm::DIType *createBitFieldType(const FieldDecl *BitFieldDecl,
274 llvm::DIScope *RecordTy,
275 const RecordDecl *RD);
277 /// Helpers for collecting fields of a record.
279 void CollectRecordLambdaFields(const CXXRecordDecl *CXXDecl,
280 SmallVectorImpl<llvm::Metadata *> &E,
281 llvm::DIType *RecordTy);
282 llvm::DIDerivedType *CreateRecordStaticField(const VarDecl *Var,
283 llvm::DIType *RecordTy,
284 const RecordDecl *RD);
285 void CollectRecordNormalField(const FieldDecl *Field, uint64_t OffsetInBits,
287 SmallVectorImpl<llvm::Metadata *> &E,
288 llvm::DIType *RecordTy, const RecordDecl *RD);
289 void CollectRecordNestedType(const TypeDecl *RD,
290 SmallVectorImpl<llvm::Metadata *> &E);
291 void CollectRecordFields(const RecordDecl *Decl, llvm::DIFile *F,
292 SmallVectorImpl<llvm::Metadata *> &E,
293 llvm::DICompositeType *RecordTy);
295 /// If the C++ class has vtable info then insert appropriate debug
296 /// info entry in EltTys vector.
297 void CollectVTableInfo(const CXXRecordDecl *Decl, llvm::DIFile *F,
298 SmallVectorImpl<llvm::Metadata *> &EltTys,
299 llvm::DICompositeType *RecordTy);
302 /// Create a new lexical block node and push it on the stack.
303 void CreateLexicalBlock(SourceLocation Loc);
305 /// If target-specific LLVM \p AddressSpace directly maps to target-specific
306 /// DWARF address space, appends extended dereferencing mechanism to complex
307 /// expression \p Expr. Otherwise, does nothing.
309 /// Extended dereferencing mechanism is has the following format:
310 /// DW_OP_constu <DWARF Address Space> DW_OP_swap DW_OP_xderef
311 void AppendAddressSpaceXDeref(unsigned AddressSpace,
312 SmallVectorImpl<int64_t> &Expr) const;
315 CGDebugInfo(CodeGenModule &CGM);
320 /// Register VLA size expression debug node with the qualified type.
321 void registerVLASizeExpression(QualType Ty, llvm::Metadata *SizeExpr) {
322 SizeExprCache[Ty] = SizeExpr;
325 /// Module debugging: Support for building PCMs.
327 /// Set the main CU's DwoId field to \p Signature.
328 void setDwoId(uint64_t Signature);
330 /// When generating debug information for a clang module or
331 /// precompiled header, this module map will be used to determine
332 /// the module of origin of each Decl.
333 void setModuleMap(ModuleMap &MMap) { ClangModuleMap = &MMap; }
335 /// When generating debug information for a clang module or
336 /// precompiled header, this module map will be used to determine
337 /// the module of origin of each Decl.
338 void setPCHDescriptor(ExternalASTSource::ASTSourceDescriptor PCH) {
343 /// Update the current source location. If \arg loc is invalid it is
345 void setLocation(SourceLocation Loc);
347 /// Return the current source location. This does not necessarily correspond
348 /// to the IRBuilder's current DebugLoc.
349 SourceLocation getLocation() const { return CurLoc; }
351 /// Update the current inline scope. All subsequent calls to \p EmitLocation
352 /// will create a location with this inlinedAt field.
353 void setInlinedAt(llvm::MDNode *InlinedAt) { CurInlinedAt = InlinedAt; }
355 /// \return the current inline scope.
356 llvm::MDNode *getInlinedAt() const { return CurInlinedAt; }
358 // Converts a SourceLocation to a DebugLoc
359 llvm::DebugLoc SourceLocToDebugLoc(SourceLocation Loc);
361 /// Emit metadata to indicate a change in line/column information in
362 /// the source file. If the location is invalid, the previous
363 /// location will be reused.
364 void EmitLocation(CGBuilderTy &Builder, SourceLocation Loc);
366 /// Emit a call to llvm.dbg.function.start to indicate
367 /// start of a new function.
368 /// \param Loc The location of the function header.
369 /// \param ScopeLoc The location of the function body.
370 void EmitFunctionStart(GlobalDecl GD, SourceLocation Loc,
371 SourceLocation ScopeLoc, QualType FnType,
372 llvm::Function *Fn, bool CurFnIsThunk,
373 CGBuilderTy &Builder);
375 /// Start a new scope for an inlined function.
376 void EmitInlineFunctionStart(CGBuilderTy &Builder, GlobalDecl GD);
377 /// End an inlined function scope.
378 void EmitInlineFunctionEnd(CGBuilderTy &Builder);
380 /// Emit debug info for a function declaration.
381 void EmitFunctionDecl(GlobalDecl GD, SourceLocation Loc, QualType FnType);
383 /// Constructs the debug code for exiting a function.
384 void EmitFunctionEnd(CGBuilderTy &Builder, llvm::Function *Fn);
386 /// Emit metadata to indicate the beginning of a new lexical block
387 /// and push the block onto the stack.
388 void EmitLexicalBlockStart(CGBuilderTy &Builder, SourceLocation Loc);
390 /// Emit metadata to indicate the end of a new lexical block and pop
391 /// the current block.
392 void EmitLexicalBlockEnd(CGBuilderTy &Builder, SourceLocation Loc);
394 /// Emit call to \c llvm.dbg.declare for an automatic variable
396 /// Returns a pointer to the DILocalVariable associated with the
397 /// llvm.dbg.declare, or nullptr otherwise.
398 llvm::DILocalVariable *EmitDeclareOfAutoVariable(const VarDecl *Decl,
400 CGBuilderTy &Builder);
402 /// Emit call to \c llvm.dbg.declare for an imported variable
403 /// declaration in a block.
404 void EmitDeclareOfBlockDeclRefVariable(
405 const VarDecl *variable, llvm::Value *storage, CGBuilderTy &Builder,
406 const CGBlockInfo &blockInfo, llvm::Instruction *InsertPoint = nullptr);
408 /// Emit call to \c llvm.dbg.declare for an argument variable
410 void EmitDeclareOfArgVariable(const VarDecl *Decl, llvm::Value *AI,
411 unsigned ArgNo, CGBuilderTy &Builder);
413 /// Emit call to \c llvm.dbg.declare for the block-literal argument
414 /// to a block invocation function.
415 void EmitDeclareOfBlockLiteralArgVariable(const CGBlockInfo &block,
416 StringRef Name, unsigned ArgNo,
417 llvm::AllocaInst *LocalAddr,
418 CGBuilderTy &Builder);
420 /// Emit information about a global variable.
421 void EmitGlobalVariable(llvm::GlobalVariable *GV, const VarDecl *Decl);
423 /// Emit a constant global variable's debug info.
424 void EmitGlobalVariable(const ValueDecl *VD, const APValue &Init);
426 /// Emit C++ using directive.
427 void EmitUsingDirective(const UsingDirectiveDecl &UD);
429 /// Emit the type explicitly casted to.
430 void EmitExplicitCastType(QualType Ty);
432 /// Emit C++ using declaration.
433 void EmitUsingDecl(const UsingDecl &UD);
435 /// Emit an @import declaration.
436 void EmitImportDecl(const ImportDecl &ID);
438 /// Emit C++ namespace alias.
439 llvm::DIImportedEntity *EmitNamespaceAlias(const NamespaceAliasDecl &NA);
441 /// Emit record type's standalone debug info.
442 llvm::DIType *getOrCreateRecordType(QualType Ty, SourceLocation L);
444 /// Emit an Objective-C interface type standalone debug info.
445 llvm::DIType *getOrCreateInterfaceType(QualType Ty, SourceLocation Loc);
447 /// Emit standalone debug info for a type.
448 llvm::DIType *getOrCreateStandaloneType(QualType Ty, SourceLocation Loc);
450 void completeType(const EnumDecl *ED);
451 void completeType(const RecordDecl *RD);
452 void completeRequiredType(const RecordDecl *RD);
453 void completeClassData(const RecordDecl *RD);
454 void completeClass(const RecordDecl *RD);
456 void completeTemplateDefinition(const ClassTemplateSpecializationDecl &SD);
457 void completeUnusedClass(const CXXRecordDecl &D);
459 /// Create debug info for a macro defined by a #define directive or a macro
460 /// undefined by a #undef directive.
461 llvm::DIMacro *CreateMacro(llvm::DIMacroFile *Parent, unsigned MType,
462 SourceLocation LineLoc, StringRef Name,
465 /// Create debug info for a file referenced by an #include directive.
466 llvm::DIMacroFile *CreateTempMacroFile(llvm::DIMacroFile *Parent,
467 SourceLocation LineLoc,
468 SourceLocation FileLoc);
471 /// Emit call to llvm.dbg.declare for a variable declaration.
472 /// Returns a pointer to the DILocalVariable associated with the
473 /// llvm.dbg.declare, or nullptr otherwise.
474 llvm::DILocalVariable *EmitDeclare(const VarDecl *decl, llvm::Value *AI,
475 llvm::Optional<unsigned> ArgNo,
476 CGBuilderTy &Builder);
478 /// Build up structure info for the byref. See \a BuildByRefType.
479 llvm::DIType *EmitTypeForVarWithBlocksAttr(const VarDecl *VD,
482 /// Get context info for the DeclContext of \p Decl.
483 llvm::DIScope *getDeclContextDescriptor(const Decl *D);
484 /// Get context info for a given DeclContext \p Decl.
485 llvm::DIScope *getContextDescriptor(const Decl *Context,
486 llvm::DIScope *Default);
488 llvm::DIScope *getCurrentContextDescriptor(const Decl *Decl);
490 /// Create a forward decl for a RecordType in a given context.
491 llvm::DICompositeType *getOrCreateRecordFwdDecl(const RecordType *,
494 /// Return current directory name.
495 StringRef getCurrentDirname();
497 /// Create new compile unit.
498 void CreateCompileUnit();
500 /// Remap a given path with the current debug prefix map
501 std::string remapDIPath(StringRef) const;
503 /// Compute the file checksum debug info for input file ID.
504 Optional<llvm::DIFile::ChecksumKind>
505 computeChecksum(FileID FID, SmallString<32> &Checksum) const;
507 /// Get the source of the given file ID.
508 Optional<StringRef> getSource(const SourceManager &SM, FileID FID);
510 /// Get the file debug info descriptor for the input location.
511 llvm::DIFile *getOrCreateFile(SourceLocation Loc);
513 /// Get the file info for main compile unit.
514 llvm::DIFile *getOrCreateMainFile();
516 /// Get the type from the cache or create a new type if necessary.
517 llvm::DIType *getOrCreateType(QualType Ty, llvm::DIFile *Fg);
519 /// Get a reference to a clang module. If \p CreateSkeletonCU is true,
520 /// this also creates a split dwarf skeleton compile unit.
522 getOrCreateModuleRef(ExternalASTSource::ASTSourceDescriptor Mod,
523 bool CreateSkeletonCU);
525 /// DebugTypeExtRefs: If \p D originated in a clang module, return it.
526 llvm::DIModule *getParentModuleOrNull(const Decl *D);
528 /// Get the type from the cache or create a new partial type if
530 llvm::DICompositeType *getOrCreateLimitedType(const RecordType *Ty,
533 /// Create type metadata for a source language type.
534 llvm::DIType *CreateTypeNode(QualType Ty, llvm::DIFile *Fg);
536 /// Create new member and increase Offset by FType's size.
537 llvm::DIType *CreateMemberType(llvm::DIFile *Unit, QualType FType,
538 StringRef Name, uint64_t *Offset);
540 /// Retrieve the DIDescriptor, if any, for the canonical form of this
542 llvm::DINode *getDeclarationOrDefinition(const Decl *D);
544 /// \return debug info descriptor to describe method
545 /// declaration for the given method definition.
546 llvm::DISubprogram *getFunctionDeclaration(const Decl *D);
548 /// \return debug info descriptor to describe in-class static data
549 /// member declaration for the given out-of-class definition. If D
550 /// is an out-of-class definition of a static data member of a
551 /// class, find its corresponding in-class declaration.
552 llvm::DIDerivedType *
553 getOrCreateStaticDataMemberDeclarationOrNull(const VarDecl *D);
555 /// Helper that either creates a forward declaration or a stub.
556 llvm::DISubprogram *getFunctionFwdDeclOrStub(GlobalDecl GD, bool Stub);
558 /// Create a subprogram describing the forward declaration
559 /// represented in the given FunctionDecl wrapped in a GlobalDecl.
560 llvm::DISubprogram *getFunctionForwardDeclaration(GlobalDecl GD);
562 /// Create a DISubprogram describing the function
563 /// represented in the given FunctionDecl wrapped in a GlobalDecl.
564 llvm::DISubprogram *getFunctionStub(GlobalDecl GD);
566 /// Create a global variable describing the forward declaration
567 /// represented in the given VarDecl.
568 llvm::DIGlobalVariable *
569 getGlobalVariableForwardDeclaration(const VarDecl *VD);
571 /// Return a global variable that represents one of the collection of global
572 /// variables created for an anonmyous union.
574 /// Recursively collect all of the member fields of a global
575 /// anonymous decl and create static variables for them. The first
576 /// time this is called it needs to be on a union and then from
577 /// there we can have additional unnamed fields.
578 llvm::DIGlobalVariableExpression *
579 CollectAnonRecordDecls(const RecordDecl *RD, llvm::DIFile *Unit,
580 unsigned LineNo, StringRef LinkageName,
581 llvm::GlobalVariable *Var, llvm::DIScope *DContext);
583 /// Get the printing policy for producing names for debug info.
584 PrintingPolicy getPrintingPolicy() const;
586 /// Get function name for the given FunctionDecl. If the name is
587 /// constructed on demand (e.g., C++ destructor) then the name is
588 /// stored on the side.
589 StringRef getFunctionName(const FunctionDecl *FD);
591 /// Returns the unmangled name of an Objective-C method.
592 /// This is the display name for the debugging info.
593 StringRef getObjCMethodName(const ObjCMethodDecl *FD);
595 /// Return selector name. This is used for debugging
597 StringRef getSelectorName(Selector S);
599 /// Get class name including template argument list.
600 StringRef getClassName(const RecordDecl *RD);
602 /// Get the vtable name for the given class.
603 StringRef getVTableName(const CXXRecordDecl *Decl);
605 /// Get line number for the location. If location is invalid
606 /// then use current location.
607 unsigned getLineNumber(SourceLocation Loc);
609 /// Get column number for the location. If location is
610 /// invalid then use current location.
611 /// \param Force Assume DebugColumnInfo option is true.
612 unsigned getColumnNumber(SourceLocation Loc, bool Force = false);
614 /// Collect various properties of a FunctionDecl.
615 /// \param GD A GlobalDecl whose getDecl() must return a FunctionDecl.
616 void collectFunctionDeclProps(GlobalDecl GD, llvm::DIFile *Unit,
617 StringRef &Name, StringRef &LinkageName,
618 llvm::DIScope *&FDContext,
619 llvm::DINodeArray &TParamsArray,
620 llvm::DINode::DIFlags &Flags);
622 /// Collect various properties of a VarDecl.
623 void collectVarDeclProps(const VarDecl *VD, llvm::DIFile *&Unit,
624 unsigned &LineNo, QualType &T, StringRef &Name,
625 StringRef &LinkageName, llvm::DIScope *&VDContext);
627 /// Allocate a copy of \p A using the DebugInfoNames allocator
628 /// and return a reference to it. If multiple arguments are given the strings
629 /// are concatenated.
630 StringRef internString(StringRef A, StringRef B = StringRef()) {
631 char *Data = DebugInfoNames.Allocate<char>(A.size() + B.size());
633 std::memcpy(Data, A.data(), A.size());
635 std::memcpy(Data + A.size(), B.data(), B.size());
636 return StringRef(Data, A.size() + B.size());
640 /// A scoped helper to set the current debug location to the specified
641 /// location or preferred location of the specified Expr.
642 class ApplyDebugLocation {
644 void init(SourceLocation TemporaryLocation, bool DefaultToEmpty = false);
645 ApplyDebugLocation(CodeGenFunction &CGF, bool DefaultToEmpty,
646 SourceLocation TemporaryLocation);
648 llvm::DebugLoc OriginalLocation;
649 CodeGenFunction *CGF;
652 /// Set the location to the (valid) TemporaryLocation.
653 ApplyDebugLocation(CodeGenFunction &CGF, SourceLocation TemporaryLocation);
654 ApplyDebugLocation(CodeGenFunction &CGF, const Expr *E);
655 ApplyDebugLocation(CodeGenFunction &CGF, llvm::DebugLoc Loc);
656 ApplyDebugLocation(ApplyDebugLocation &&Other) : CGF(Other.CGF) {
660 ~ApplyDebugLocation();
662 /// Apply TemporaryLocation if it is valid. Otherwise switch
663 /// to an artificial debug location that has a valid scope, but no
664 /// line information.
666 /// Artificial locations are useful when emitting compiler-generated
667 /// helper functions that have no source location associated with
668 /// them. The DWARF specification allows the compiler to use the
669 /// special line number 0 to indicate code that can not be
670 /// attributed to any source location. Note that passing an empty
671 /// SourceLocation to CGDebugInfo::setLocation() will result in the
672 /// last valid location being reused.
673 static ApplyDebugLocation CreateArtificial(CodeGenFunction &CGF) {
674 return ApplyDebugLocation(CGF, false, SourceLocation());
676 /// Apply TemporaryLocation if it is valid. Otherwise switch
677 /// to an artificial debug location that has a valid scope, but no
678 /// line information.
679 static ApplyDebugLocation
680 CreateDefaultArtificial(CodeGenFunction &CGF,
681 SourceLocation TemporaryLocation) {
682 return ApplyDebugLocation(CGF, false, TemporaryLocation);
685 /// Set the IRBuilder to not attach debug locations. Note that
686 /// passing an empty SourceLocation to \a CGDebugInfo::setLocation()
687 /// will result in the last valid location being reused. Note that
688 /// all instructions that do not have a location at the beginning of
689 /// a function are counted towards to function prologue.
690 static ApplyDebugLocation CreateEmpty(CodeGenFunction &CGF) {
691 return ApplyDebugLocation(CGF, true, SourceLocation());
695 /// A scoped helper to set the current debug location to an inlined location.
696 class ApplyInlineDebugLocation {
697 SourceLocation SavedLocation;
698 CodeGenFunction *CGF;
701 /// Set up the CodeGenFunction's DebugInfo to produce inline locations for the
702 /// function \p InlinedFn. The current debug location becomes the inlined call
703 /// site of the inlined function.
704 ApplyInlineDebugLocation(CodeGenFunction &CGF, GlobalDecl InlinedFn);
705 /// Restore everything back to the orginial state.
706 ~ApplyInlineDebugLocation();
709 } // namespace CodeGen
712 #endif // LLVM_CLANG_LIB_CODEGEN_CGDEBUGINFO_H