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 CLANG_CODEGEN_CGDEBUGINFO_H
15 #define CLANG_CODEGEN_CGDEBUGINFO_H
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"
35 class ObjCInterfaceDecl;
37 class ClassTemplateSpecializationDecl;
43 class CodeGenFunction;
46 /// CGDebugInfo - This class gathers all debug information during compilation
47 /// and is responsible for emitting to llvm globals or pass directly to
50 friend class ArtificialLocation;
51 friend class SaveAndRestoreLocation;
53 const CodeGenOptions::DebugInfoKind DebugKind;
54 llvm::DIBuilder DBuilder;
55 llvm::DICompileUnit TheCU;
56 SourceLocation CurLoc, PrevLoc;
57 llvm::DIType VTablePtrType;
59 llvm::DICompositeType ObjTy;
61 llvm::DIType OCLImage1dDITy, OCLImage1dArrayDITy, OCLImage1dBufferDITy;
62 llvm::DIType OCLImage2dDITy, OCLImage2dArrayDITy;
63 llvm::DIType OCLImage3dDITy;
64 llvm::DIType OCLEventDITy;
65 llvm::DIType BlockLiteralGeneric;
67 /// TypeCache - Cache of previously constructed Types.
68 llvm::DenseMap<const void *, llvm::WeakVH> TypeCache;
70 struct ObjCInterfaceCacheEntry {
71 const ObjCInterfaceType *Type;
74 ObjCInterfaceCacheEntry(const ObjCInterfaceType *Type, llvm::DIType Decl,
76 : Type(Type), Decl(Decl), Unit(Unit) {}
79 /// ObjCInterfaceCache - Cache of previously constructed interfaces
81 llvm::SmallVector<ObjCInterfaceCacheEntry, 32> ObjCInterfaceCache;
83 /// RetainedTypes - list of interfaces we want to keep even if orphaned.
84 std::vector<void *> RetainedTypes;
86 /// ReplaceMap - Cache of forward declared types to RAUW at the end of
88 std::vector<std::pair<const TagType *, llvm::WeakVH>> ReplaceMap;
90 // LexicalBlockStack - Keep track of our current nested lexical block.
91 std::vector<llvm::TrackingVH<llvm::MDNode> > LexicalBlockStack;
92 llvm::DenseMap<const Decl *, llvm::WeakVH> RegionMap;
93 // FnBeginRegionCount - Keep track of LexicalBlockStack counter at the
94 // beginning of a function. This is used to pop unbalanced regions at
95 // the end of a function.
96 std::vector<unsigned> FnBeginRegionCount;
98 /// DebugInfoNames - This is a storage for names that are
99 /// constructed on demand. For example, C++ destructors, C++ operators etc..
100 llvm::BumpPtrAllocator DebugInfoNames;
103 llvm::DenseMap<const char *, llvm::WeakVH> DIFileCache;
104 llvm::DenseMap<const FunctionDecl *, llvm::WeakVH> SPCache;
105 /// \brief Cache declarations relevant to DW_TAG_imported_declarations (C++
106 /// using declarations) that aren't covered by other more specific caches.
107 llvm::DenseMap<const Decl *, llvm::WeakVH> DeclCache;
108 llvm::DenseMap<const NamespaceDecl *, llvm::WeakVH> NameSpaceCache;
109 llvm::DenseMap<const NamespaceAliasDecl *, llvm::WeakVH> NamespaceAliasCache;
110 llvm::DenseMap<const Decl *, llvm::WeakVH> StaticDataMemberCache;
112 /// Helper functions for getOrCreateType.
113 unsigned Checksum(const ObjCInterfaceDecl *InterfaceDecl);
114 llvm::DIType CreateType(const BuiltinType *Ty);
115 llvm::DIType CreateType(const ComplexType *Ty);
116 llvm::DIType CreateQualifiedType(QualType Ty, llvm::DIFile Fg);
117 llvm::DIType CreateType(const TypedefType *Ty, llvm::DIFile Fg);
118 llvm::DIType CreateType(const TemplateSpecializationType *Ty, llvm::DIFile Fg);
119 llvm::DIType CreateType(const ObjCObjectPointerType *Ty,
121 llvm::DIType CreateType(const PointerType *Ty, llvm::DIFile F);
122 llvm::DIType CreateType(const BlockPointerType *Ty, llvm::DIFile F);
123 llvm::DIType CreateType(const FunctionType *Ty, llvm::DIFile F);
124 llvm::DIType CreateType(const RecordType *Tyg);
125 llvm::DIType CreateTypeDefinition(const RecordType *Ty);
126 llvm::DICompositeType CreateLimitedType(const RecordType *Ty);
127 void CollectContainingType(const CXXRecordDecl *RD, llvm::DICompositeType CT);
128 llvm::DIType CreateType(const ObjCInterfaceType *Ty, llvm::DIFile F);
129 llvm::DIType CreateTypeDefinition(const ObjCInterfaceType *Ty, llvm::DIFile F);
130 llvm::DIType CreateType(const ObjCObjectType *Ty, llvm::DIFile F);
131 llvm::DIType CreateType(const VectorType *Ty, llvm::DIFile F);
132 llvm::DIType CreateType(const ArrayType *Ty, llvm::DIFile F);
133 llvm::DIType CreateType(const LValueReferenceType *Ty, llvm::DIFile F);
134 llvm::DIType CreateType(const RValueReferenceType *Ty, llvm::DIFile Unit);
135 llvm::DIType CreateType(const MemberPointerType *Ty, llvm::DIFile F);
136 llvm::DIType CreateType(const AtomicType *Ty, llvm::DIFile F);
137 llvm::DIType CreateEnumType(const EnumType *Ty);
138 llvm::DIType CreateSelfType(const QualType &QualTy, llvm::DIType Ty);
139 llvm::DIType getTypeOrNull(const QualType);
140 llvm::DICompositeType getOrCreateMethodType(const CXXMethodDecl *Method,
142 llvm::DICompositeType getOrCreateInstanceMethodType(
143 QualType ThisPtr, const FunctionProtoType *Func, llvm::DIFile Unit);
144 llvm::DICompositeType getOrCreateFunctionType(const Decl *D, QualType FnType,
146 llvm::DIType getOrCreateVTablePtrType(llvm::DIFile F);
147 llvm::DINameSpace getOrCreateNameSpace(const NamespaceDecl *N);
148 llvm::DIType getOrCreateTypeDeclaration(QualType PointeeTy, llvm::DIFile F);
149 llvm::DIType CreatePointerLikeType(unsigned Tag,
150 const Type *Ty, QualType PointeeTy,
153 llvm::Value *getCachedInterfaceTypeOrNull(const QualType Ty);
154 llvm::DIType getOrCreateStructPtrType(StringRef Name, llvm::DIType &Cache);
156 llvm::DISubprogram CreateCXXMemberFunction(const CXXMethodDecl *Method,
158 llvm::DIType RecordTy);
160 void CollectCXXMemberFunctions(const CXXRecordDecl *Decl,
162 SmallVectorImpl<llvm::Value *> &E,
165 void CollectCXXBases(const CXXRecordDecl *Decl,
167 SmallVectorImpl<llvm::Value *> &EltTys,
168 llvm::DIType RecordTy);
171 CollectTemplateParams(const TemplateParameterList *TPList,
172 ArrayRef<TemplateArgument> TAList,
175 CollectFunctionTemplateParams(const FunctionDecl *FD, llvm::DIFile Unit);
177 CollectCXXTemplateParams(const ClassTemplateSpecializationDecl *TS,
180 llvm::DIType createFieldType(StringRef name, QualType type,
181 uint64_t sizeInBitsOverride, SourceLocation loc,
182 AccessSpecifier AS, uint64_t offsetInBits,
184 llvm::DIScope scope);
186 // Helpers for collecting fields of a record.
187 void CollectRecordLambdaFields(const CXXRecordDecl *CXXDecl,
188 SmallVectorImpl<llvm::Value *> &E,
189 llvm::DIType RecordTy);
190 llvm::DIDerivedType CreateRecordStaticField(const VarDecl *Var,
191 llvm::DIType RecordTy);
192 void CollectRecordNormalField(const FieldDecl *Field, uint64_t OffsetInBits,
194 SmallVectorImpl<llvm::Value *> &E,
195 llvm::DIType RecordTy);
196 void CollectRecordFields(const RecordDecl *Decl, llvm::DIFile F,
197 SmallVectorImpl<llvm::Value *> &E,
198 llvm::DICompositeType RecordTy);
200 void CollectVTableInfo(const CXXRecordDecl *Decl,
202 SmallVectorImpl<llvm::Value *> &EltTys);
204 // CreateLexicalBlock - Create a new lexical block node and push it on
206 void CreateLexicalBlock(SourceLocation Loc);
209 CGDebugInfo(CodeGenModule &CGM);
214 /// setLocation - Update the current source location. If \arg loc is
215 /// invalid it is ignored.
216 void setLocation(SourceLocation Loc);
218 /// getLocation - Return the current source location.
219 SourceLocation getLocation() const { return CurLoc; }
221 /// EmitLocation - Emit metadata to indicate a change in line/column
222 /// information in the source file.
223 /// \param ForceColumnInfo Assume DebugColumnInfo option is true.
224 void EmitLocation(CGBuilderTy &Builder, SourceLocation Loc,
225 bool ForceColumnInfo = false);
227 /// EmitFunctionStart - Emit a call to llvm.dbg.function.start to indicate
228 /// start of a new function.
229 /// \param Loc The location of the function header.
230 /// \param ScopeLoc The location of the function body.
231 void EmitFunctionStart(GlobalDecl GD,
232 SourceLocation Loc, SourceLocation ScopeLoc,
233 QualType FnType, llvm::Function *Fn,
234 CGBuilderTy &Builder);
236 /// EmitFunctionEnd - Constructs the debug code for exiting a function.
237 void EmitFunctionEnd(CGBuilderTy &Builder);
239 /// EmitLexicalBlockStart - Emit metadata to indicate the beginning of a
240 /// new lexical block and push the block onto the stack.
241 void EmitLexicalBlockStart(CGBuilderTy &Builder, SourceLocation Loc);
243 /// EmitLexicalBlockEnd - Emit metadata to indicate the end of a new lexical
244 /// block and pop the current block.
245 void EmitLexicalBlockEnd(CGBuilderTy &Builder, SourceLocation Loc);
247 /// EmitDeclareOfAutoVariable - Emit call to llvm.dbg.declare for an automatic
248 /// variable declaration.
249 void EmitDeclareOfAutoVariable(const VarDecl *Decl, llvm::Value *AI,
250 CGBuilderTy &Builder);
252 /// EmitDeclareOfBlockDeclRefVariable - Emit call to llvm.dbg.declare for an
253 /// imported variable declaration in a block.
254 void EmitDeclareOfBlockDeclRefVariable(const VarDecl *variable,
255 llvm::Value *storage,
256 CGBuilderTy &Builder,
257 const CGBlockInfo &blockInfo);
259 /// EmitDeclareOfArgVariable - Emit call to llvm.dbg.declare for an argument
260 /// variable declaration.
261 void EmitDeclareOfArgVariable(const VarDecl *Decl, llvm::Value *AI,
262 unsigned ArgNo, CGBuilderTy &Builder);
264 /// EmitDeclareOfBlockLiteralArgVariable - Emit call to
265 /// llvm.dbg.declare for the block-literal argument to a block
266 /// invocation function.
267 void EmitDeclareOfBlockLiteralArgVariable(const CGBlockInfo &block,
269 llvm::Value *LocalAddr,
270 CGBuilderTy &Builder);
272 /// EmitGlobalVariable - Emit information about a global variable.
273 void EmitGlobalVariable(llvm::GlobalVariable *GV, const VarDecl *Decl);
275 /// EmitGlobalVariable - Emit information about an objective-c interface.
276 void EmitGlobalVariable(llvm::GlobalVariable *GV, ObjCInterfaceDecl *Decl);
278 /// EmitGlobalVariable - Emit global variable's debug info.
279 void EmitGlobalVariable(const ValueDecl *VD, llvm::Constant *Init);
281 /// \brief - Emit C++ using directive.
282 void EmitUsingDirective(const UsingDirectiveDecl &UD);
284 /// \brief - Emit C++ using declaration.
285 void EmitUsingDecl(const UsingDecl &UD);
287 /// \brief - Emit C++ namespace alias.
288 llvm::DIImportedEntity EmitNamespaceAlias(const NamespaceAliasDecl &NA);
290 /// getOrCreateRecordType - Emit record type's standalone debug info.
291 llvm::DIType getOrCreateRecordType(QualType Ty, SourceLocation L);
293 /// getOrCreateInterfaceType - Emit an objective c interface type standalone
295 llvm::DIType getOrCreateInterfaceType(QualType Ty,
298 void completeType(const RecordDecl *RD);
299 void completeRequiredType(const RecordDecl *RD);
300 void completeClassData(const RecordDecl *RD);
302 void completeTemplateDefinition(const ClassTemplateSpecializationDecl &SD);
305 /// EmitDeclare - Emit call to llvm.dbg.declare for a variable declaration.
306 void EmitDeclare(const VarDecl *decl, unsigned Tag, llvm::Value *AI,
307 unsigned ArgNo, CGBuilderTy &Builder);
309 // EmitTypeForVarWithBlocksAttr - Build up structure info for the byref.
310 // See BuildByRefType.
311 llvm::DIType EmitTypeForVarWithBlocksAttr(const VarDecl *VD,
314 /// getContextDescriptor - Get context info for the decl.
315 llvm::DIScope getContextDescriptor(const Decl *Decl);
317 llvm::DIScope getCurrentContextDescriptor(const Decl *Decl);
319 /// \brief Create a forward decl for a RecordType in a given context.
320 llvm::DICompositeType getOrCreateRecordFwdDecl(const RecordType *,
323 /// createContextChain - Create a set of decls for the context chain.
324 llvm::DIDescriptor createContextChain(const Decl *Decl);
326 /// getCurrentDirname - Return current directory name.
327 StringRef getCurrentDirname();
329 /// CreateCompileUnit - Create new compile unit.
330 void CreateCompileUnit();
332 /// getOrCreateFile - Get the file debug info descriptor for the input
334 llvm::DIFile getOrCreateFile(SourceLocation Loc);
336 /// getOrCreateMainFile - Get the file info for main compile unit.
337 llvm::DIFile getOrCreateMainFile();
339 /// getOrCreateType - Get the type from the cache or create a new type if
341 llvm::DIType getOrCreateType(QualType Ty, llvm::DIFile Fg);
343 /// getOrCreateLimitedType - Get the type from the cache or create a new
344 /// partial type if necessary.
345 llvm::DIType getOrCreateLimitedType(const RecordType *Ty, llvm::DIFile F);
347 /// CreateTypeNode - Create type metadata for a source language type.
348 llvm::DIType CreateTypeNode(QualType Ty, llvm::DIFile Fg);
350 /// getObjCInterfaceDecl - return the underlying ObjCInterfaceDecl
351 /// if Ty is an ObjCInterface or a pointer to one.
352 ObjCInterfaceDecl* getObjCInterfaceDecl(QualType Ty);
354 /// CreateMemberType - Create new member and increase Offset by FType's size.
355 llvm::DIType CreateMemberType(llvm::DIFile Unit, QualType FType,
356 StringRef Name, uint64_t *Offset);
358 /// \brief Retrieve the DIScope, if any, for the canonical form of this
360 llvm::DIScope getDeclarationOrDefinition(const Decl *D);
362 /// getFunctionDeclaration - Return debug info descriptor to describe method
363 /// declaration for the given method definition.
364 llvm::DISubprogram getFunctionDeclaration(const Decl *D);
366 /// Return debug info descriptor to describe in-class static data member
367 /// declaration for the given out-of-class definition.
369 getOrCreateStaticDataMemberDeclarationOrNull(const VarDecl *D);
371 /// Return a global variable that represents one of the collection of
372 /// global variables created for an anonmyous union.
373 llvm::DIGlobalVariable
374 CollectAnonRecordDecls(const RecordDecl *RD, llvm::DIFile Unit, unsigned LineNo,
375 StringRef LinkageName, llvm::GlobalVariable *Var,
376 llvm::DIDescriptor DContext);
378 /// getFunctionName - Get function name for the given FunctionDecl. If the
379 /// name is constructed on demand (e.g. C++ destructor) then the name
380 /// is stored on the side.
381 StringRef getFunctionName(const FunctionDecl *FD);
383 /// getObjCMethodName - Returns the unmangled name of an Objective-C method.
384 /// This is the display name for the debugging info.
385 StringRef getObjCMethodName(const ObjCMethodDecl *FD);
387 /// getSelectorName - Return selector name. This is used for debugging
389 StringRef getSelectorName(Selector S);
391 /// getClassName - Get class name including template argument list.
392 StringRef getClassName(const RecordDecl *RD);
394 /// getVTableName - Get vtable name for the given Class.
395 StringRef getVTableName(const CXXRecordDecl *Decl);
397 /// getLineNumber - Get line number for the location. If location is invalid
398 /// then use current location.
399 unsigned getLineNumber(SourceLocation Loc);
401 /// getColumnNumber - Get column number for the location. If location is
402 /// invalid then use current location.
403 /// \param Force Assume DebugColumnInfo option is true.
404 unsigned getColumnNumber(SourceLocation Loc, bool Force=false);
406 /// internString - Allocate a copy of \p A using the DebugInfoNames allocator
407 /// and return a reference to it. If multiple arguments are given the strings
408 /// are concatenated.
409 StringRef internString(StringRef A, StringRef B = StringRef()) {
410 char *Data = DebugInfoNames.Allocate<char>(A.size() + B.size());
411 std::memcpy(Data, A.data(), A.size());
412 std::memcpy(Data + A.size(), B.data(), B.size());
413 return StringRef(Data, A.size() + B.size());
417 /// SaveAndRestoreLocation - An RAII object saves the current location
418 /// and automatically restores it to the original value.
419 class SaveAndRestoreLocation {
421 SourceLocation SavedLoc;
423 CGBuilderTy &Builder;
425 SaveAndRestoreLocation(CodeGenFunction &CGF, CGBuilderTy &B);
426 /// Autorestore everything back to normal.
427 ~SaveAndRestoreLocation();
430 /// NoLocation - An RAII object that temporarily disables debug
431 /// locations. This is useful for emitting instructions that should be
432 /// counted towards the function prologue.
433 class NoLocation : public SaveAndRestoreLocation {
435 NoLocation(CodeGenFunction &CGF, CGBuilderTy &B);
436 /// Autorestore everything back to normal.
440 /// ArtificialLocation - An RAII object that temporarily switches to
441 /// an artificial debug location that has a valid scope, but no line
442 /// information. This is useful when emitting compiler-generated
443 /// helper functions that have no source location associated with
444 /// them. The DWARF specification allows the compiler to use the
445 /// special line number 0 to indicate code that can not be attributed
446 /// to any source location.
448 /// This is necessary because passing an empty SourceLocation to
449 /// CGDebugInfo::setLocation() will result in the last valid location
451 class ArtificialLocation : public SaveAndRestoreLocation {
453 ArtificialLocation(CodeGenFunction &CGF, CGBuilderTy &B);
455 /// Set the current location to line 0, but within the current scope
456 /// (= the top of the LexicalBlockStack).
459 /// Autorestore everything back to normal.
460 ~ArtificialLocation();
464 } // namespace CodeGen