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CGDebugInfo.h
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1 //===--- CGDebugInfo.h - DebugInfo for LLVM CodeGen -------------*- C++ -*-===//
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 is the source-level debug info generator for llvm translation.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #ifndef LLVM_CLANG_LIB_CODEGEN_CGDEBUGINFO_H
14 #define LLVM_CLANG_LIB_CODEGEN_CGDEBUGINFO_H
15 
16 #include "CGBuilder.h"
17 #include "clang/AST/DeclCXX.h"
18 #include "clang/AST/Expr.h"
20 #include "clang/AST/Type.h"
21 #include "clang/AST/TypeOrdering.h"
24 #include "llvm/ADT/DenseMap.h"
25 #include "llvm/ADT/DenseSet.h"
26 #include "llvm/ADT/Optional.h"
27 #include "llvm/IR/DIBuilder.h"
28 #include "llvm/IR/DebugInfo.h"
29 #include "llvm/IR/ValueHandle.h"
30 #include "llvm/Support/Allocator.h"
31 
32 namespace llvm {
33 class MDNode;
34 }
35 
36 namespace clang {
37 class ClassTemplateSpecializationDecl;
38 class GlobalDecl;
39 class ModuleMap;
40 class ObjCInterfaceDecl;
41 class ObjCIvarDecl;
42 class UsingDecl;
43 class VarDecl;
44 
45 namespace CodeGen {
46 class CodeGenModule;
47 class CodeGenFunction;
48 class CGBlockInfo;
49 
50 /// This class gathers all debug information during compilation and is
51 /// responsible for emitting to llvm globals or pass directly to the
52 /// backend.
53 class CGDebugInfo {
54  friend class ApplyDebugLocation;
55  friend class SaveAndRestoreLocation;
56  CodeGenModule &CGM;
57  const codegenoptions::DebugInfoKind DebugKind;
58  bool DebugTypeExtRefs;
59  llvm::DIBuilder DBuilder;
60  llvm::DICompileUnit *TheCU = nullptr;
61  ModuleMap *ClangModuleMap = nullptr;
63  SourceLocation CurLoc;
64  llvm::MDNode *CurInlinedAt = nullptr;
65  llvm::DIType *VTablePtrType = nullptr;
66  llvm::DIType *ClassTy = nullptr;
67  llvm::DICompositeType *ObjTy = nullptr;
68  llvm::DIType *SelTy = nullptr;
69 #define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
70  llvm::DIType *SingletonId = nullptr;
71 #include "clang/Basic/OpenCLImageTypes.def"
72  llvm::DIType *OCLSamplerDITy = nullptr;
73  llvm::DIType *OCLEventDITy = nullptr;
74  llvm::DIType *OCLClkEventDITy = nullptr;
75  llvm::DIType *OCLQueueDITy = nullptr;
76  llvm::DIType *OCLNDRangeDITy = nullptr;
77  llvm::DIType *OCLReserveIDDITy = nullptr;
78 #define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \
79  llvm::DIType *Id##Ty = nullptr;
80 #include "clang/Basic/OpenCLExtensionTypes.def"
81 
82  /// Cache of previously constructed Types.
83  llvm::DenseMap<const void *, llvm::TrackingMDRef> TypeCache;
84 
85  llvm::SmallDenseMap<llvm::StringRef, llvm::StringRef> DebugPrefixMap;
86 
87  /// Cache that maps VLA types to size expressions for that type,
88  /// represented by instantiated Metadata nodes.
89  llvm::SmallDenseMap<QualType, llvm::Metadata *> SizeExprCache;
90 
91  struct ObjCInterfaceCacheEntry {
92  const ObjCInterfaceType *Type;
93  llvm::DIType *Decl;
94  llvm::DIFile *Unit;
95  ObjCInterfaceCacheEntry(const ObjCInterfaceType *Type, llvm::DIType *Decl,
96  llvm::DIFile *Unit)
97  : Type(Type), Decl(Decl), Unit(Unit) {}
98  };
99 
100  /// Cache of previously constructed interfaces which may change.
102 
103  /// Cache of forward declarations for methods belonging to the interface.
104  llvm::DenseMap<const ObjCInterfaceDecl *, std::vector<llvm::DISubprogram *>>
105  ObjCMethodCache;
106 
107  /// Cache of references to clang modules and precompiled headers.
108  llvm::DenseMap<const Module *, llvm::TrackingMDRef> ModuleCache;
109 
110  /// List of interfaces we want to keep even if orphaned.
111  std::vector<void *> RetainedTypes;
112 
113  /// Cache of forward declared types to RAUW at the end of compilation.
114  std::vector<std::pair<const TagType *, llvm::TrackingMDRef>> ReplaceMap;
115 
116  /// Cache of replaceable forward declarations (functions and
117  /// variables) to RAUW at the end of compilation.
118  std::vector<std::pair<const DeclaratorDecl *, llvm::TrackingMDRef>>
119  FwdDeclReplaceMap;
120 
121  /// Keep track of our current nested lexical block.
122  std::vector<llvm::TypedTrackingMDRef<llvm::DIScope>> LexicalBlockStack;
123  llvm::DenseMap<const Decl *, llvm::TrackingMDRef> RegionMap;
124  /// Keep track of LexicalBlockStack counter at the beginning of a
125  /// function. This is used to pop unbalanced regions at the end of a
126  /// function.
127  std::vector<unsigned> FnBeginRegionCount;
128 
129  /// This is a storage for names that are constructed on demand. For
130  /// example, C++ destructors, C++ operators etc..
131  llvm::BumpPtrAllocator DebugInfoNames;
132  StringRef CWDName;
133 
134  llvm::DenseMap<const char *, llvm::TrackingMDRef> DIFileCache;
135  llvm::DenseMap<const FunctionDecl *, llvm::TrackingMDRef> SPCache;
136  /// Cache declarations relevant to DW_TAG_imported_declarations (C++
137  /// using declarations) that aren't covered by other more specific caches.
138  llvm::DenseMap<const Decl *, llvm::TrackingMDRef> DeclCache;
139  llvm::DenseMap<const NamespaceDecl *, llvm::TrackingMDRef> NamespaceCache;
140  llvm::DenseMap<const NamespaceAliasDecl *, llvm::TrackingMDRef>
141  NamespaceAliasCache;
142  llvm::DenseMap<const Decl *, llvm::TypedTrackingMDRef<llvm::DIDerivedType>>
143  StaticDataMemberCache;
144 
145  /// Helper functions for getOrCreateType.
146  /// @{
147  /// Currently the checksum of an interface includes the number of
148  /// ivars and property accessors.
149  llvm::DIType *CreateType(const BuiltinType *Ty);
150  llvm::DIType *CreateType(const ComplexType *Ty);
151  llvm::DIType *CreateQualifiedType(QualType Ty, llvm::DIFile *Fg);
152  llvm::DIType *CreateType(const TypedefType *Ty, llvm::DIFile *Fg);
153  llvm::DIType *CreateType(const TemplateSpecializationType *Ty,
154  llvm::DIFile *Fg);
155  llvm::DIType *CreateType(const ObjCObjectPointerType *Ty, llvm::DIFile *F);
156  llvm::DIType *CreateType(const PointerType *Ty, llvm::DIFile *F);
157  llvm::DIType *CreateType(const BlockPointerType *Ty, llvm::DIFile *F);
158  llvm::DIType *CreateType(const FunctionType *Ty, llvm::DIFile *F);
159  /// Get structure or union type.
160  llvm::DIType *CreateType(const RecordType *Tyg);
161  llvm::DIType *CreateTypeDefinition(const RecordType *Ty);
162  llvm::DICompositeType *CreateLimitedType(const RecordType *Ty);
163  void CollectContainingType(const CXXRecordDecl *RD,
164  llvm::DICompositeType *CT);
165  /// Get Objective-C interface type.
166  llvm::DIType *CreateType(const ObjCInterfaceType *Ty, llvm::DIFile *F);
167  llvm::DIType *CreateTypeDefinition(const ObjCInterfaceType *Ty,
168  llvm::DIFile *F);
169  /// Get Objective-C object type.
170  llvm::DIType *CreateType(const ObjCObjectType *Ty, llvm::DIFile *F);
171  llvm::DIType *CreateType(const ObjCTypeParamType *Ty, llvm::DIFile *Unit);
172 
173  llvm::DIType *CreateType(const VectorType *Ty, llvm::DIFile *F);
174  llvm::DIType *CreateType(const ArrayType *Ty, llvm::DIFile *F);
175  llvm::DIType *CreateType(const LValueReferenceType *Ty, llvm::DIFile *F);
176  llvm::DIType *CreateType(const RValueReferenceType *Ty, llvm::DIFile *Unit);
177  llvm::DIType *CreateType(const MemberPointerType *Ty, llvm::DIFile *F);
178  llvm::DIType *CreateType(const AtomicType *Ty, llvm::DIFile *F);
179  llvm::DIType *CreateType(const PipeType *Ty, llvm::DIFile *F);
180  /// Get enumeration type.
181  llvm::DIType *CreateEnumType(const EnumType *Ty);
182  llvm::DIType *CreateTypeDefinition(const EnumType *Ty);
183  /// Look up the completed type for a self pointer in the TypeCache and
184  /// create a copy of it with the ObjectPointer and Artificial flags
185  /// set. If the type is not cached, a new one is created. This should
186  /// never happen though, since creating a type for the implicit self
187  /// argument implies that we already parsed the interface definition
188  /// and the ivar declarations in the implementation.
189  llvm::DIType *CreateSelfType(const QualType &QualTy, llvm::DIType *Ty);
190  /// @}
191 
192  /// Get the type from the cache or return null type if it doesn't
193  /// exist.
194  llvm::DIType *getTypeOrNull(const QualType);
195  /// Return the debug type for a C++ method.
196  /// \arg CXXMethodDecl is of FunctionType. This function type is
197  /// not updated to include implicit \c this pointer. Use this routine
198  /// to get a method type which includes \c this pointer.
199  llvm::DISubroutineType *getOrCreateMethodType(const CXXMethodDecl *Method,
200  llvm::DIFile *F);
201  llvm::DISubroutineType *
202  getOrCreateInstanceMethodType(QualType ThisPtr, const FunctionProtoType *Func,
203  llvm::DIFile *Unit);
204  llvm::DISubroutineType *
205  getOrCreateFunctionType(const Decl *D, QualType FnType, llvm::DIFile *F);
206  /// \return debug info descriptor for vtable.
207  llvm::DIType *getOrCreateVTablePtrType(llvm::DIFile *F);
208 
209  /// \return namespace descriptor for the given namespace decl.
210  llvm::DINamespace *getOrCreateNamespace(const NamespaceDecl *N);
211  llvm::DIType *CreatePointerLikeType(llvm::dwarf::Tag Tag, const Type *Ty,
212  QualType PointeeTy, llvm::DIFile *F);
213  llvm::DIType *getOrCreateStructPtrType(StringRef Name, llvm::DIType *&Cache);
214 
215  /// A helper function to create a subprogram for a single member
216  /// function GlobalDecl.
217  llvm::DISubprogram *CreateCXXMemberFunction(const CXXMethodDecl *Method,
218  llvm::DIFile *F,
219  llvm::DIType *RecordTy);
220 
221  /// A helper function to collect debug info for C++ member
222  /// functions. This is used while creating debug info entry for a
223  /// Record.
224  void CollectCXXMemberFunctions(const CXXRecordDecl *Decl, llvm::DIFile *F,
225  SmallVectorImpl<llvm::Metadata *> &E,
226  llvm::DIType *T);
227 
228  /// A helper function to collect debug info for C++ base
229  /// classes. This is used while creating debug info entry for a
230  /// Record.
231  void CollectCXXBases(const CXXRecordDecl *Decl, llvm::DIFile *F,
232  SmallVectorImpl<llvm::Metadata *> &EltTys,
233  llvm::DIType *RecordTy);
234 
235  /// Helper function for CollectCXXBases.
236  /// Adds debug info entries for types in Bases that are not in SeenTypes.
237  void CollectCXXBasesAux(
238  const CXXRecordDecl *RD, llvm::DIFile *Unit,
239  SmallVectorImpl<llvm::Metadata *> &EltTys, llvm::DIType *RecordTy,
240  const CXXRecordDecl::base_class_const_range &Bases,
241  llvm::DenseSet<CanonicalDeclPtr<const CXXRecordDecl>> &SeenTypes,
242  llvm::DINode::DIFlags StartingFlags);
243 
244  /// A helper function to collect template parameters.
245  llvm::DINodeArray CollectTemplateParams(const TemplateParameterList *TPList,
246  ArrayRef<TemplateArgument> TAList,
247  llvm::DIFile *Unit);
248  /// A helper function to collect debug info for function template
249  /// parameters.
250  llvm::DINodeArray CollectFunctionTemplateParams(const FunctionDecl *FD,
251  llvm::DIFile *Unit);
252 
253  /// A helper function to collect debug info for function template
254  /// parameters.
255  llvm::DINodeArray CollectVarTemplateParams(const VarDecl *VD,
256  llvm::DIFile *Unit);
257 
258  /// A helper function to collect debug info for template
259  /// parameters.
260  llvm::DINodeArray
261  CollectCXXTemplateParams(const ClassTemplateSpecializationDecl *TS,
262  llvm::DIFile *F);
263 
264  llvm::DIType *createFieldType(StringRef name, QualType type,
265  SourceLocation loc, AccessSpecifier AS,
266  uint64_t offsetInBits, uint32_t AlignInBits,
267  llvm::DIFile *tunit, llvm::DIScope *scope,
268  const RecordDecl *RD = nullptr);
269 
270  llvm::DIType *createFieldType(StringRef name, QualType type,
271  SourceLocation loc, AccessSpecifier AS,
272  uint64_t offsetInBits, llvm::DIFile *tunit,
273  llvm::DIScope *scope,
274  const RecordDecl *RD = nullptr) {
275  return createFieldType(name, type, loc, AS, offsetInBits, 0, tunit, scope,
276  RD);
277  }
278 
279  /// Create new bit field member.
280  llvm::DIType *createBitFieldType(const FieldDecl *BitFieldDecl,
281  llvm::DIScope *RecordTy,
282  const RecordDecl *RD);
283 
284  /// Helpers for collecting fields of a record.
285  /// @{
286  void CollectRecordLambdaFields(const CXXRecordDecl *CXXDecl,
287  SmallVectorImpl<llvm::Metadata *> &E,
288  llvm::DIType *RecordTy);
289  llvm::DIDerivedType *CreateRecordStaticField(const VarDecl *Var,
290  llvm::DIType *RecordTy,
291  const RecordDecl *RD);
292  void CollectRecordNormalField(const FieldDecl *Field, uint64_t OffsetInBits,
293  llvm::DIFile *F,
294  SmallVectorImpl<llvm::Metadata *> &E,
295  llvm::DIType *RecordTy, const RecordDecl *RD);
296  void CollectRecordNestedType(const TypeDecl *RD,
297  SmallVectorImpl<llvm::Metadata *> &E);
298  void CollectRecordFields(const RecordDecl *Decl, llvm::DIFile *F,
299  SmallVectorImpl<llvm::Metadata *> &E,
300  llvm::DICompositeType *RecordTy);
301 
302  /// If the C++ class has vtable info then insert appropriate debug
303  /// info entry in EltTys vector.
304  void CollectVTableInfo(const CXXRecordDecl *Decl, llvm::DIFile *F,
305  SmallVectorImpl<llvm::Metadata *> &EltTys,
306  llvm::DICompositeType *RecordTy);
307  /// @}
308 
309  /// Create a new lexical block node and push it on the stack.
310  void CreateLexicalBlock(SourceLocation Loc);
311 
312  /// If target-specific LLVM \p AddressSpace directly maps to target-specific
313  /// DWARF address space, appends extended dereferencing mechanism to complex
314  /// expression \p Expr. Otherwise, does nothing.
315  ///
316  /// Extended dereferencing mechanism is has the following format:
317  /// DW_OP_constu <DWARF Address Space> DW_OP_swap DW_OP_xderef
318  void AppendAddressSpaceXDeref(unsigned AddressSpace,
319  SmallVectorImpl<int64_t> &Expr) const;
320 
321  /// A helper function to collect debug info for the default elements of a
322  /// block.
323  ///
324  /// \returns The next available field offset after the default elements.
325  uint64_t collectDefaultElementTypesForBlockPointer(
326  const BlockPointerType *Ty, llvm::DIFile *Unit,
327  llvm::DIDerivedType *DescTy, unsigned LineNo,
328  SmallVectorImpl<llvm::Metadata *> &EltTys);
329 
330  /// A helper function to collect debug info for the default fields of a
331  /// block.
332  void collectDefaultFieldsForBlockLiteralDeclare(
333  const CGBlockInfo &Block, const ASTContext &Context, SourceLocation Loc,
334  const llvm::StructLayout &BlockLayout, llvm::DIFile *Unit,
335  SmallVectorImpl<llvm::Metadata *> &Fields);
336 
337 public:
338  CGDebugInfo(CodeGenModule &CGM);
339  ~CGDebugInfo();
340 
341  void finalize();
342 
343  /// Remap a given path with the current debug prefix map
344  std::string remapDIPath(StringRef) const;
345 
346  /// Register VLA size expression debug node with the qualified type.
347  void registerVLASizeExpression(QualType Ty, llvm::Metadata *SizeExpr) {
348  SizeExprCache[Ty] = SizeExpr;
349  }
350 
351  /// Module debugging: Support for building PCMs.
352  /// @{
353  /// Set the main CU's DwoId field to \p Signature.
354  void setDwoId(uint64_t Signature);
355 
356  /// When generating debug information for a clang module or
357  /// precompiled header, this module map will be used to determine
358  /// the module of origin of each Decl.
359  void setModuleMap(ModuleMap &MMap) { ClangModuleMap = &MMap; }
360 
361  /// When generating debug information for a clang module or
362  /// precompiled header, this module map will be used to determine
363  /// the module of origin of each Decl.
365  PCHDescriptor = PCH;
366  }
367  /// @}
368 
369  /// Update the current source location. If \arg loc is invalid it is
370  /// ignored.
371  void setLocation(SourceLocation Loc);
372 
373  /// Return the current source location. This does not necessarily correspond
374  /// to the IRBuilder's current DebugLoc.
375  SourceLocation getLocation() const { return CurLoc; }
376 
377  /// Update the current inline scope. All subsequent calls to \p EmitLocation
378  /// will create a location with this inlinedAt field.
379  void setInlinedAt(llvm::MDNode *InlinedAt) { CurInlinedAt = InlinedAt; }
380 
381  /// \return the current inline scope.
382  llvm::MDNode *getInlinedAt() const { return CurInlinedAt; }
383 
384  // Converts a SourceLocation to a DebugLoc
385  llvm::DebugLoc SourceLocToDebugLoc(SourceLocation Loc);
386 
387  /// Emit metadata to indicate a change in line/column information in
388  /// the source file. If the location is invalid, the previous
389  /// location will be reused.
390  void EmitLocation(CGBuilderTy &Builder, SourceLocation Loc);
391 
392  /// Emit a call to llvm.dbg.function.start to indicate
393  /// start of a new function.
394  /// \param Loc The location of the function header.
395  /// \param ScopeLoc The location of the function body.
396  void EmitFunctionStart(GlobalDecl GD, SourceLocation Loc,
397  SourceLocation ScopeLoc, QualType FnType,
398  llvm::Function *Fn, bool CurFnIsThunk,
399  CGBuilderTy &Builder);
400 
401  /// Start a new scope for an inlined function.
402  void EmitInlineFunctionStart(CGBuilderTy &Builder, GlobalDecl GD);
403  /// End an inlined function scope.
404  void EmitInlineFunctionEnd(CGBuilderTy &Builder);
405 
406  /// Emit debug info for a function declaration.
407  void EmitFunctionDecl(GlobalDecl GD, SourceLocation Loc, QualType FnType);
408 
409  /// Constructs the debug code for exiting a function.
410  void EmitFunctionEnd(CGBuilderTy &Builder, llvm::Function *Fn);
411 
412  /// Emit metadata to indicate the beginning of a new lexical block
413  /// and push the block onto the stack.
414  void EmitLexicalBlockStart(CGBuilderTy &Builder, SourceLocation Loc);
415 
416  /// Emit metadata to indicate the end of a new lexical block and pop
417  /// the current block.
418  void EmitLexicalBlockEnd(CGBuilderTy &Builder, SourceLocation Loc);
419 
420  /// Emit call to \c llvm.dbg.declare for an automatic variable
421  /// declaration.
422  /// Returns a pointer to the DILocalVariable associated with the
423  /// llvm.dbg.declare, or nullptr otherwise.
424  llvm::DILocalVariable *EmitDeclareOfAutoVariable(const VarDecl *Decl,
425  llvm::Value *AI,
426  CGBuilderTy &Builder);
427 
428  /// Emit call to \c llvm.dbg.label for an label.
429  void EmitLabel(const LabelDecl *D, CGBuilderTy &Builder);
430 
431  /// Emit call to \c llvm.dbg.declare for an imported variable
432  /// declaration in a block.
433  void EmitDeclareOfBlockDeclRefVariable(
434  const VarDecl *variable, llvm::Value *storage, CGBuilderTy &Builder,
435  const CGBlockInfo &blockInfo, llvm::Instruction *InsertPoint = nullptr);
436 
437  /// Emit call to \c llvm.dbg.declare for an argument variable
438  /// declaration.
439  void EmitDeclareOfArgVariable(const VarDecl *Decl, llvm::Value *AI,
440  unsigned ArgNo, CGBuilderTy &Builder);
441 
442  /// Emit call to \c llvm.dbg.declare for the block-literal argument
443  /// to a block invocation function.
444  void EmitDeclareOfBlockLiteralArgVariable(const CGBlockInfo &block,
445  StringRef Name, unsigned ArgNo,
446  llvm::AllocaInst *LocalAddr,
447  CGBuilderTy &Builder);
448 
449  /// Emit information about a global variable.
450  void EmitGlobalVariable(llvm::GlobalVariable *GV, const VarDecl *Decl);
451 
452  /// Emit a constant global variable's debug info.
453  void EmitGlobalVariable(const ValueDecl *VD, const APValue &Init);
454 
455  /// Emit C++ using directive.
456  void EmitUsingDirective(const UsingDirectiveDecl &UD);
457 
458  /// Emit the type explicitly casted to.
459  void EmitExplicitCastType(QualType Ty);
460 
461  /// Emit C++ using declaration.
462  void EmitUsingDecl(const UsingDecl &UD);
463 
464  /// Emit an @import declaration.
465  void EmitImportDecl(const ImportDecl &ID);
466 
467  /// Emit C++ namespace alias.
468  llvm::DIImportedEntity *EmitNamespaceAlias(const NamespaceAliasDecl &NA);
469 
470  /// Emit record type's standalone debug info.
471  llvm::DIType *getOrCreateRecordType(QualType Ty, SourceLocation L);
472 
473  /// Emit an Objective-C interface type standalone debug info.
474  llvm::DIType *getOrCreateInterfaceType(QualType Ty, SourceLocation Loc);
475 
476  /// Emit standalone debug info for a type.
477  llvm::DIType *getOrCreateStandaloneType(QualType Ty, SourceLocation Loc);
478 
479  void completeType(const EnumDecl *ED);
480  void completeType(const RecordDecl *RD);
481  void completeRequiredType(const RecordDecl *RD);
482  void completeClassData(const RecordDecl *RD);
483  void completeClass(const RecordDecl *RD);
484 
485  void completeTemplateDefinition(const ClassTemplateSpecializationDecl &SD);
486  void completeUnusedClass(const CXXRecordDecl &D);
487 
488  /// Create debug info for a macro defined by a #define directive or a macro
489  /// undefined by a #undef directive.
490  llvm::DIMacro *CreateMacro(llvm::DIMacroFile *Parent, unsigned MType,
491  SourceLocation LineLoc, StringRef Name,
492  StringRef Value);
493 
494  /// Create debug info for a file referenced by an #include directive.
495  llvm::DIMacroFile *CreateTempMacroFile(llvm::DIMacroFile *Parent,
496  SourceLocation LineLoc,
497  SourceLocation FileLoc);
498 
499 private:
500  /// Emit call to llvm.dbg.declare for a variable declaration.
501  /// Returns a pointer to the DILocalVariable associated with the
502  /// llvm.dbg.declare, or nullptr otherwise.
503  llvm::DILocalVariable *EmitDeclare(const VarDecl *decl, llvm::Value *AI,
505  CGBuilderTy &Builder);
506 
507  struct BlockByRefType {
508  /// The wrapper struct used inside the __block_literal struct.
509  llvm::DIType *BlockByRefWrapper;
510  /// The type as it appears in the source code.
511  llvm::DIType *WrappedType;
512  };
513 
514  /// Build up structure info for the byref. See \a BuildByRefType.
515  BlockByRefType EmitTypeForVarWithBlocksAttr(const VarDecl *VD,
516  uint64_t *OffSet);
517 
518  /// Get context info for the DeclContext of \p Decl.
519  llvm::DIScope *getDeclContextDescriptor(const Decl *D);
520  /// Get context info for a given DeclContext \p Decl.
521  llvm::DIScope *getContextDescriptor(const Decl *Context,
522  llvm::DIScope *Default);
523 
524  llvm::DIScope *getCurrentContextDescriptor(const Decl *Decl);
525 
526  /// Create a forward decl for a RecordType in a given context.
527  llvm::DICompositeType *getOrCreateRecordFwdDecl(const RecordType *,
528  llvm::DIScope *);
529 
530  /// Return current directory name.
531  StringRef getCurrentDirname();
532 
533  /// Create new compile unit.
534  void CreateCompileUnit();
535 
536  /// Compute the file checksum debug info for input file ID.
538  computeChecksum(FileID FID, SmallString<32> &Checksum) const;
539 
540  /// Get the source of the given file ID.
541  Optional<StringRef> getSource(const SourceManager &SM, FileID FID);
542 
543  /// Convenience function to get the file debug info descriptor for the input
544  /// location.
545  llvm::DIFile *getOrCreateFile(SourceLocation Loc);
546 
547  /// Create a file debug info descriptor for a source file.
548  llvm::DIFile *
549  createFile(StringRef FileName,
550  Optional<llvm::DIFile::ChecksumInfo<StringRef>> CSInfo,
551  Optional<StringRef> Source);
552 
553  /// Get the type from the cache or create a new type if necessary.
554  llvm::DIType *getOrCreateType(QualType Ty, llvm::DIFile *Fg);
555 
556  /// Get a reference to a clang module. If \p CreateSkeletonCU is true,
557  /// this also creates a split dwarf skeleton compile unit.
558  llvm::DIModule *
559  getOrCreateModuleRef(ExternalASTSource::ASTSourceDescriptor Mod,
560  bool CreateSkeletonCU);
561 
562  /// DebugTypeExtRefs: If \p D originated in a clang module, return it.
563  llvm::DIModule *getParentModuleOrNull(const Decl *D);
564 
565  /// Get the type from the cache or create a new partial type if
566  /// necessary.
567  llvm::DICompositeType *getOrCreateLimitedType(const RecordType *Ty,
568  llvm::DIFile *F);
569 
570  /// Create type metadata for a source language type.
571  llvm::DIType *CreateTypeNode(QualType Ty, llvm::DIFile *Fg);
572 
573  /// Create new member and increase Offset by FType's size.
574  llvm::DIType *CreateMemberType(llvm::DIFile *Unit, QualType FType,
575  StringRef Name, uint64_t *Offset);
576 
577  /// Retrieve the DIDescriptor, if any, for the canonical form of this
578  /// declaration.
579  llvm::DINode *getDeclarationOrDefinition(const Decl *D);
580 
581  /// \return debug info descriptor to describe method
582  /// declaration for the given method definition.
583  llvm::DISubprogram *getFunctionDeclaration(const Decl *D);
584 
585  /// \return debug info descriptor to describe in-class static data
586  /// member declaration for the given out-of-class definition. If D
587  /// is an out-of-class definition of a static data member of a
588  /// class, find its corresponding in-class declaration.
589  llvm::DIDerivedType *
590  getOrCreateStaticDataMemberDeclarationOrNull(const VarDecl *D);
591 
592  /// Helper that either creates a forward declaration or a stub.
593  llvm::DISubprogram *getFunctionFwdDeclOrStub(GlobalDecl GD, bool Stub);
594 
595  /// Create a subprogram describing the forward declaration
596  /// represented in the given FunctionDecl wrapped in a GlobalDecl.
597  llvm::DISubprogram *getFunctionForwardDeclaration(GlobalDecl GD);
598 
599  /// Create a DISubprogram describing the function
600  /// represented in the given FunctionDecl wrapped in a GlobalDecl.
601  llvm::DISubprogram *getFunctionStub(GlobalDecl GD);
602 
603  /// Create a global variable describing the forward declaration
604  /// represented in the given VarDecl.
605  llvm::DIGlobalVariable *
606  getGlobalVariableForwardDeclaration(const VarDecl *VD);
607 
608  /// Return a global variable that represents one of the collection of global
609  /// variables created for an anonmyous union.
610  ///
611  /// Recursively collect all of the member fields of a global
612  /// anonymous decl and create static variables for them. The first
613  /// time this is called it needs to be on a union and then from
614  /// there we can have additional unnamed fields.
615  llvm::DIGlobalVariableExpression *
616  CollectAnonRecordDecls(const RecordDecl *RD, llvm::DIFile *Unit,
617  unsigned LineNo, StringRef LinkageName,
618  llvm::GlobalVariable *Var, llvm::DIScope *DContext);
619 
620 
621  /// Return flags which enable debug info emission for call sites, provided
622  /// that it is supported and enabled.
623  llvm::DINode::DIFlags getCallSiteRelatedAttrs() const;
624 
625  /// Get the printing policy for producing names for debug info.
626  PrintingPolicy getPrintingPolicy() const;
627 
628  /// Get function name for the given FunctionDecl. If the name is
629  /// constructed on demand (e.g., C++ destructor) then the name is
630  /// stored on the side.
631  StringRef getFunctionName(const FunctionDecl *FD);
632 
633  /// Returns the unmangled name of an Objective-C method.
634  /// This is the display name for the debugging info.
635  StringRef getObjCMethodName(const ObjCMethodDecl *FD);
636 
637  /// Return selector name. This is used for debugging
638  /// info.
639  StringRef getSelectorName(Selector S);
640 
641  /// Get class name including template argument list.
642  StringRef getClassName(const RecordDecl *RD);
643 
644  /// Get the vtable name for the given class.
645  StringRef getVTableName(const CXXRecordDecl *Decl);
646 
647  /// Get line number for the location. If location is invalid
648  /// then use current location.
649  unsigned getLineNumber(SourceLocation Loc);
650 
651  /// Get column number for the location. If location is
652  /// invalid then use current location.
653  /// \param Force Assume DebugColumnInfo option is true.
654  unsigned getColumnNumber(SourceLocation Loc, bool Force = false);
655 
656  /// Collect various properties of a FunctionDecl.
657  /// \param GD A GlobalDecl whose getDecl() must return a FunctionDecl.
658  void collectFunctionDeclProps(GlobalDecl GD, llvm::DIFile *Unit,
659  StringRef &Name, StringRef &LinkageName,
660  llvm::DIScope *&FDContext,
661  llvm::DINodeArray &TParamsArray,
662  llvm::DINode::DIFlags &Flags);
663 
664  /// Collect various properties of a VarDecl.
665  void collectVarDeclProps(const VarDecl *VD, llvm::DIFile *&Unit,
666  unsigned &LineNo, QualType &T, StringRef &Name,
667  StringRef &LinkageName,
668  llvm::MDTuple *&TemplateParameters,
669  llvm::DIScope *&VDContext);
670 
671  /// Allocate a copy of \p A using the DebugInfoNames allocator
672  /// and return a reference to it. If multiple arguments are given the strings
673  /// are concatenated.
674  StringRef internString(StringRef A, StringRef B = StringRef()) {
675  char *Data = DebugInfoNames.Allocate<char>(A.size() + B.size());
676  if (!A.empty())
677  std::memcpy(Data, A.data(), A.size());
678  if (!B.empty())
679  std::memcpy(Data + A.size(), B.data(), B.size());
680  return StringRef(Data, A.size() + B.size());
681  }
682 };
683 
684 /// A scoped helper to set the current debug location to the specified
685 /// location or preferred location of the specified Expr.
687 private:
688  void init(SourceLocation TemporaryLocation, bool DefaultToEmpty = false);
689  ApplyDebugLocation(CodeGenFunction &CGF, bool DefaultToEmpty,
690  SourceLocation TemporaryLocation);
691 
692  llvm::DebugLoc OriginalLocation;
693  CodeGenFunction *CGF;
694 
695 public:
696  /// Set the location to the (valid) TemporaryLocation.
697  ApplyDebugLocation(CodeGenFunction &CGF, SourceLocation TemporaryLocation);
698  ApplyDebugLocation(CodeGenFunction &CGF, const Expr *E);
699  ApplyDebugLocation(CodeGenFunction &CGF, llvm::DebugLoc Loc);
700  ApplyDebugLocation(ApplyDebugLocation &&Other) : CGF(Other.CGF) {
701  Other.CGF = nullptr;
702  }
703 
705 
706  /// Apply TemporaryLocation if it is valid. Otherwise switch
707  /// to an artificial debug location that has a valid scope, but no
708  /// line information.
709  ///
710  /// Artificial locations are useful when emitting compiler-generated
711  /// helper functions that have no source location associated with
712  /// them. The DWARF specification allows the compiler to use the
713  /// special line number 0 to indicate code that can not be
714  /// attributed to any source location. Note that passing an empty
715  /// SourceLocation to CGDebugInfo::setLocation() will result in the
716  /// last valid location being reused.
718  return ApplyDebugLocation(CGF, false, SourceLocation());
719  }
720  /// Apply TemporaryLocation if it is valid. Otherwise switch
721  /// to an artificial debug location that has a valid scope, but no
722  /// line information.
723  static ApplyDebugLocation
725  SourceLocation TemporaryLocation) {
726  return ApplyDebugLocation(CGF, false, TemporaryLocation);
727  }
728 
729  /// Set the IRBuilder to not attach debug locations. Note that
730  /// passing an empty SourceLocation to \a CGDebugInfo::setLocation()
731  /// will result in the last valid location being reused. Note that
732  /// all instructions that do not have a location at the beginning of
733  /// a function are counted towards to function prologue.
735  return ApplyDebugLocation(CGF, true, SourceLocation());
736  }
737 };
738 
739 /// A scoped helper to set the current debug location to an inlined location.
741  SourceLocation SavedLocation;
742  CodeGenFunction *CGF;
743 
744 public:
745  /// Set up the CodeGenFunction's DebugInfo to produce inline locations for the
746  /// function \p InlinedFn. The current debug location becomes the inlined call
747  /// site of the inlined function.
749  /// Restore everything back to the original state.
751 };
752 
753 } // namespace CodeGen
754 } // namespace clang
755 
756 #endif // LLVM_CLANG_LIB_CODEGEN_CGDEBUGINFO_H
Represents a function declaration or definition.
Definition: Decl.h:1737
llvm::MDNode * getInlinedAt() const
Definition: CGDebugInfo.h:382
Smart pointer class that efficiently represents Objective-C method names.
void EmitLocation(raw_ostream &o, const SourceManager &SM, SourceLocation L, const FIDMap &FM, unsigned indent)
Definition: PlistSupport.h:107
A (possibly-)qualified type.
Definition: Type.h:639
DominatorTree GraphTraits specialization so the DominatorTree can be iterable by generic graph iterat...
Definition: Dominators.h:29
C Language Family Type Representation.
AccessSpecifier
A C++ access specifier (public, private, protected), plus the special value "none" which means differ...
Definition: Specifiers.h:97
void finalize(TemplateInstantiationCallbackPtrs &Callbacks, const Sema &TheSema)
void setPCHDescriptor(ExternalASTSource::ASTSourceDescriptor PCH)
When generating debug information for a clang module or precompiled header, this module map will be u...
Definition: CGDebugInfo.h:364
Represents a variable declaration or definition.
Definition: Decl.h:812
This class gathers all debug information during compilation and is responsible for emitting to llvm g...
Definition: CGDebugInfo.h:53
ObjCMethodDecl - Represents an instance or class method declaration.
Definition: DeclObjC.h:138
Describes how types, statements, expressions, and declarations should be printed. ...
Definition: PrettyPrinter.h:37
void setInlinedAt(llvm::MDNode *InlinedAt)
Update the current inline scope.
Definition: CGDebugInfo.h:379
Represents a struct/union/class.
Definition: Decl.h:3592
Represents a class template specialization, which refers to a class template with a given set of temp...
CodeGenFunction - This class organizes the per-function state that is used while generating LLVM code...
static ApplyDebugLocation CreateArtificial(CodeGenFunction &CGF)
Apply TemporaryLocation if it is valid.
Definition: CGDebugInfo.h:717
Represents a C++ using-declaration.
Definition: DeclCXX.h:3359
void registerVLASizeExpression(QualType Ty, llvm::Metadata *SizeExpr)
Register VLA size expression debug node with the qualified type.
Definition: CGDebugInfo.h:347
NodeId Parent
Definition: ASTDiff.cpp:191
CGBlockInfo - Information to generate a block literal.
Definition: CGBlocks.h:152
unsigned Offset
Definition: Format.cpp:1640
Allows QualTypes to be sorted and hence used in maps and sets.
Represent the declaration of a variable (in which case it is an lvalue) a function (in which case it ...
Definition: Decl.h:636
This represents one expression.
Definition: Expr.h:108
const internal::VariadicAllOfMatcher< Decl > decl
Matches declarations.
A scoped helper to set the current debug location to an inlined location.
Definition: CGDebugInfo.h:740
static json::Object createFile(const FileEntry &FE)
const SourceManager & SM
Definition: Format.cpp:1499
GlobalDecl - represents a global declaration.
Definition: GlobalDecl.h:34
Encodes a location in the source.
Represents the declaration of a label.
Definition: Decl.h:468
A scoped helper to set the current debug location to the specified location or preferred location of ...
Definition: CGDebugInfo.h:686
__DEVICE__ void * memcpy(void *__a, const void *__b, size_t __c)
Describes a module import declaration, which makes the contents of the named module visible in the cu...
Definition: Decl.h:4155
SourceLocation getLocation() const
Return the current source location.
Definition: CGDebugInfo.h:375
An opaque identifier used by SourceManager which refers to a source file (MemoryBuffer) along with it...
This class organizes the cross-function state that is used while generating LLVM code.
Optional< types::ID > Type
Dataflow Directional Tag Classes.
static ApplyDebugLocation CreateDefaultArtificial(CodeGenFunction &CGF, SourceLocation TemporaryLocation)
Apply TemporaryLocation if it is valid.
Definition: CGDebugInfo.h:724
Represents an enum.
Definition: Decl.h:3325
void setModuleMap(ModuleMap &MMap)
When generating debug information for a clang module or precompiled header, this module map will be u...
Definition: CGDebugInfo.h:359
A helper class that allows the use of isa/cast/dyncast to detect TagType objects of structs/unions/cl...
Definition: Type.h:4380
ApplyDebugLocation(ApplyDebugLocation &&Other)
Definition: CGDebugInfo.h:700
APValue - This class implements a discriminated union of [uninitialized] [APSInt] [APFloat]...
Definition: APValue.h:38
The type-property cache.
Definition: Type.cpp:3527
Defines the C++ Decl subclasses, other than those for templates (found in DeclTemplate.h) and friends (in DeclFriend.h).
Defines the clang::SourceLocation class and associated facilities.
Represents a C++ struct/union/class.
Definition: DeclCXX.h:299
Abstracts clang modules and precompiled header files and holds everything needed to generate debug in...
static ApplyDebugLocation CreateEmpty(CodeGenFunction &CGF)
Set the IRBuilder to not attach debug locations.
Definition: CGDebugInfo.h:734
Represents a C++ namespace alias.
Definition: DeclCXX.h:3027
Represents C++ using-directive.
Definition: DeclCXX.h:2923
This class handles loading and caching of source files into memory.