1 //===- DebugInfo.h - Debug Information Helpers ------------------*- 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 file defines a bunch of datatypes that are useful for creating and
11 // walking debug info in LLVM IR form. They essentially provide wrappers around
12 // the information in the global variables that's needed when constructing the
15 //===----------------------------------------------------------------------===//
17 #ifndef LLVM_IR_DEBUGINFO_H
18 #define LLVM_IR_DEBUGINFO_H
20 #include "llvm/ADT/DenseMap.h"
21 #include "llvm/ADT/SmallPtrSet.h"
22 #include "llvm/ADT/SmallVector.h"
23 #include "llvm/ADT/StringRef.h"
24 #include "llvm/ADT/iterator_range.h"
25 #include "llvm/IR/DebugInfoMetadata.h"
26 #include "llvm/Support/Casting.h"
27 #include "llvm/Support/Dwarf.h"
28 #include "llvm/Support/ErrorHandling.h"
52 class DILexicalBlockFile;
58 /// \brief Maps from type identifier to the actual MDNode.
59 typedef DenseMap<const MDString *, MDNode *> DITypeIdentifierMap;
61 /// \brief A thin wraper around MDNode to access encoded debug info.
63 /// This should not be stored in a container, because the underlying MDNode may
64 /// change in certain situations.
66 // Befriends DIRef so DIRef can befriend the protected member
67 // function: getFieldAs<DIRef>.
68 template <typename T> friend class DIRef;
71 /// \brief Duplicated debug info flags.
73 /// \see DebugNode::DIFlags.
75 #define HANDLE_DI_FLAG(ID, NAME) Flag##NAME = DebugNode::Flag##NAME,
76 #include "llvm/IR/DebugInfoFlags.def"
77 FlagAccessibility = DebugNode::FlagAccessibility
81 const MDNode *DbgNode;
83 DIDescriptor getDescriptorField(unsigned Elt) const;
84 template <typename DescTy> DescTy getFieldAs(unsigned Elt) const {
85 return DescTy(getDescriptorField(Elt));
89 explicit DIDescriptor(const MDNode *N = nullptr) : DbgNode(N) {}
91 MDNode *get() const { return const_cast<MDNode *>(DbgNode); }
92 operator MDNode *() const { return get(); }
93 MDNode *operator->() const { return get(); }
94 MDNode &operator*() const {
95 assert(get() && "Expected valid pointer");
99 // An explicit operator bool so that we can do testing of DI values
101 // FIXME: This operator bool isn't actually protecting anything at the
102 // moment due to the conversion operator above making DIDescriptor nodes
103 // implicitly convertable to bool.
104 explicit operator bool() const { return DbgNode != nullptr; }
106 bool operator==(DIDescriptor Other) const { return DbgNode == Other.DbgNode; }
107 bool operator!=(DIDescriptor Other) const { return !operator==(Other); }
109 uint16_t getTag() const {
110 if (auto *N = dyn_cast_or_null<DebugNode>(get()))
115 void print(raw_ostream &OS) const;
118 /// \brief Replace all uses of debug info referenced by this descriptor.
119 void replaceAllUsesWith(LLVMContext &VMContext, DIDescriptor D);
120 void replaceAllUsesWith(MDNode *D);
123 #define DECLARE_SIMPLIFY_DESCRIPTOR(DESC) \
125 template <> struct simplify_type<const DESC>; \
126 template <> struct simplify_type<DESC>;
127 DECLARE_SIMPLIFY_DESCRIPTOR(DIDescriptor)
128 DECLARE_SIMPLIFY_DESCRIPTOR(DISubrange)
129 DECLARE_SIMPLIFY_DESCRIPTOR(DIEnumerator)
130 DECLARE_SIMPLIFY_DESCRIPTOR(DIScope)
131 DECLARE_SIMPLIFY_DESCRIPTOR(DIType)
132 DECLARE_SIMPLIFY_DESCRIPTOR(DIBasicType)
133 DECLARE_SIMPLIFY_DESCRIPTOR(DIDerivedType)
134 DECLARE_SIMPLIFY_DESCRIPTOR(DICompositeType)
135 DECLARE_SIMPLIFY_DESCRIPTOR(DISubroutineType)
136 DECLARE_SIMPLIFY_DESCRIPTOR(DIFile)
137 DECLARE_SIMPLIFY_DESCRIPTOR(DICompileUnit)
138 DECLARE_SIMPLIFY_DESCRIPTOR(DISubprogram)
139 DECLARE_SIMPLIFY_DESCRIPTOR(DILexicalBlock)
140 DECLARE_SIMPLIFY_DESCRIPTOR(DILexicalBlockFile)
141 DECLARE_SIMPLIFY_DESCRIPTOR(DINameSpace)
142 DECLARE_SIMPLIFY_DESCRIPTOR(DITemplateTypeParameter)
143 DECLARE_SIMPLIFY_DESCRIPTOR(DITemplateValueParameter)
144 DECLARE_SIMPLIFY_DESCRIPTOR(DIGlobalVariable)
145 DECLARE_SIMPLIFY_DESCRIPTOR(DIVariable)
146 DECLARE_SIMPLIFY_DESCRIPTOR(DIExpression)
147 DECLARE_SIMPLIFY_DESCRIPTOR(DILocation)
148 DECLARE_SIMPLIFY_DESCRIPTOR(DIObjCProperty)
149 DECLARE_SIMPLIFY_DESCRIPTOR(DIImportedEntity)
150 #undef DECLARE_SIMPLIFY_DESCRIPTOR
152 /// \brief This is used to represent ranges, for array bounds.
153 class DISubrange : public DIDescriptor {
155 DISubrange() = default;
156 DISubrange(const MDSubrange *N) : DIDescriptor(N) {}
158 MDSubrange *get() const {
159 return cast_or_null<MDSubrange>(DIDescriptor::get());
161 operator MDSubrange *() const { return get(); }
162 MDSubrange *operator->() const { return get(); }
163 MDSubrange &operator*() const {
164 assert(get() && "Expected valid pointer");
168 int64_t getLo() const { return get()->getLowerBound(); }
169 int64_t getCount() const { return get()->getCount(); }
172 /// \brief This descriptor holds an array of nodes with type T.
173 template <typename T> class DITypedArray : public DIDescriptor {
175 explicit DITypedArray(const MDNode *N = nullptr) : DIDescriptor(N) {}
176 operator MDTuple *() const {
177 return const_cast<MDTuple *>(cast_or_null<MDTuple>(DbgNode));
179 unsigned getNumElements() const {
180 return DbgNode ? DbgNode->getNumOperands() : 0;
182 T getElement(unsigned Idx) const { return getFieldAs<T>(Idx); }
185 typedef DITypedArray<DIDescriptor> DIArray;
187 /// \brief A wrapper for an enumerator (e.g. X and Y in 'enum {X,Y}').
189 /// FIXME: it seems strange that this doesn't have either a reference to the
190 /// type/precision or a file/line pair for location info.
191 class DIEnumerator : public DIDescriptor {
193 DIEnumerator() = default;
194 DIEnumerator(const MDEnumerator *N) : DIDescriptor(N) {}
196 MDEnumerator *get() const {
197 return cast_or_null<MDEnumerator>(DIDescriptor::get());
199 operator MDEnumerator *() const { return get(); }
200 MDEnumerator *operator->() const { return get(); }
201 MDEnumerator &operator*() const {
202 assert(get() && "Expected valid pointer");
206 StringRef getName() const { return get()->getName(); }
207 int64_t getEnumValue() const { return get()->getValue(); }
210 template <typename T> class DIRef;
211 typedef DIRef<DIDescriptor> DIDescriptorRef;
212 typedef DIRef<DIScope> DIScopeRef;
213 typedef DIRef<DIType> DITypeRef;
214 typedef DITypedArray<DITypeRef> DITypeArray;
216 /// \brief A base class for various scopes.
218 /// Although, implementation-wise, DIScope is the parent class of most
219 /// other DIxxx classes, including DIType and its descendants, most of
220 /// DIScope's descendants are not a substitutable subtype of
221 /// DIScope. The DIDescriptor::isScope() method only is true for
222 /// DIScopes that are scopes in the strict lexical scope sense
223 /// (DICompileUnit, DISubprogram, etc.), but not for, e.g., a DIType.
224 class DIScope : public DIDescriptor {
227 DIScope(const MDScope *N) : DIDescriptor(N) {}
229 MDScope *get() const { return cast_or_null<MDScope>(DIDescriptor::get()); }
230 operator MDScope *() const { return get(); }
231 MDScope *operator->() const { return get(); }
232 MDScope &operator*() const {
233 assert(get() && "Expected valid pointer");
237 /// \brief Get the parent scope.
239 /// Gets the parent scope for this scope node or returns a default
240 /// constructed scope.
241 DIScopeRef getContext() const;
242 /// \brief Get the scope name.
244 /// If the scope node has a name, return that, else return an empty string.
245 StringRef getName() const;
246 StringRef getFilename() const;
247 StringRef getDirectory() const;
249 /// \brief Generate a reference to this DIScope.
251 /// Uses the type identifier instead of the actual MDNode if possible, to
252 /// help type uniquing.
253 DIScopeRef getRef() const;
256 /// \brief Represents reference to a DIDescriptor.
258 /// Abstracts over direct and identifier-based metadata references.
259 template <typename T> class DIRef {
260 template <typename DescTy>
261 friend DescTy DIDescriptor::getFieldAs(unsigned Elt) const;
262 friend DIScopeRef DIScope::getContext() const;
263 friend DIScopeRef DIScope::getRef() const;
266 /// \brief Val can be either a MDNode or a MDString.
268 /// In the latter, MDString specifies the type identifier.
270 explicit DIRef(const Metadata *V);
274 DIRef(const TypedDebugNodeRef<U> &Ref,
275 typename std::enable_if<std::is_convertible<U *, T>::value>::type * =
279 T resolve(const DITypeIdentifierMap &Map) const;
280 operator Metadata *() const { return const_cast<Metadata *>(Val); }
282 static DIRef get(const Metadata *MD) { return DIRef(MD); }
286 DIDescriptor DIRef<DIDescriptor>::resolve(const DITypeIdentifierMap &Map) const;
288 DIScope DIRef<DIScope>::resolve(const DITypeIdentifierMap &Map) const;
289 template <> DIType DIRef<DIType>::resolve(const DITypeIdentifierMap &Map) const;
291 /// \brief Handle fields that are references to DIDescriptors.
293 DIDescriptorRef DIDescriptor::getFieldAs<DIDescriptorRef>(unsigned Elt) const;
294 /// \brief Specialize DIRef constructor for DIDescriptorRef.
295 template <> DIRef<DIDescriptor>::DIRef(const Metadata *V);
297 /// \brief Handle fields that are references to DIScopes.
298 template <> DIScopeRef DIDescriptor::getFieldAs<DIScopeRef>(unsigned Elt) const;
299 /// \brief Specialize DIRef constructor for DIScopeRef.
300 template <> DIRef<DIScope>::DIRef(const Metadata *V);
302 /// \brief Handle fields that are references to DITypes.
303 template <> DITypeRef DIDescriptor::getFieldAs<DITypeRef>(unsigned Elt) const;
304 /// \brief Specialize DIRef constructor for DITypeRef.
305 template <> DIRef<DIType>::DIRef(const Metadata *V);
307 /// \brief This is a wrapper for a type.
309 /// FIXME: Types should be factored much better so that CV qualifiers and
310 /// others do not require a huge and empty descriptor full of zeros.
311 class DIType : public DIScope {
314 DIType(const MDType *N) : DIScope(N) {}
316 MDType *get() const { return cast_or_null<MDType>(DIDescriptor::get()); }
317 operator MDType *() const { return get(); }
318 MDType *operator->() const { return get(); }
319 MDType &operator*() const {
320 assert(get() && "Expected valid pointer");
324 DIScopeRef getContext() const { return DIScopeRef::get(get()->getScope()); }
325 StringRef getName() const { return get()->getName(); }
326 unsigned getLineNumber() const { return get()->getLine(); }
327 uint64_t getSizeInBits() const { return get()->getSizeInBits(); }
328 uint64_t getAlignInBits() const { return get()->getAlignInBits(); }
329 // FIXME: Offset is only used for DW_TAG_member nodes. Making every type
330 // carry this is just plain insane.
331 uint64_t getOffsetInBits() const { return get()->getOffsetInBits(); }
332 unsigned getFlags() const { return get()->getFlags(); }
333 bool isPrivate() const {
334 return (getFlags() & FlagAccessibility) == FlagPrivate;
336 bool isProtected() const {
337 return (getFlags() & FlagAccessibility) == FlagProtected;
339 bool isPublic() const {
340 return (getFlags() & FlagAccessibility) == FlagPublic;
342 bool isForwardDecl() const { return (getFlags() & FlagFwdDecl) != 0; }
343 bool isAppleBlockExtension() const {
344 return (getFlags() & FlagAppleBlock) != 0;
346 bool isBlockByrefStruct() const {
347 return (getFlags() & FlagBlockByrefStruct) != 0;
349 bool isVirtual() const { return (getFlags() & FlagVirtual) != 0; }
350 bool isArtificial() const { return (getFlags() & FlagArtificial) != 0; }
351 bool isObjectPointer() const { return (getFlags() & FlagObjectPointer) != 0; }
352 bool isObjcClassComplete() const {
353 return (getFlags() & FlagObjcClassComplete) != 0;
355 bool isVector() const { return (getFlags() & FlagVector) != 0; }
356 bool isStaticMember() const { return (getFlags() & FlagStaticMember) != 0; }
357 bool isLValueReference() const {
358 return (getFlags() & FlagLValueReference) != 0;
360 bool isRValueReference() const {
361 return (getFlags() & FlagRValueReference) != 0;
363 bool isValid() const { return DbgNode && isa<MDType>(*this); }
366 /// \brief A basic type, like 'int' or 'float'.
367 class DIBasicType : public DIType {
369 DIBasicType() = default;
370 DIBasicType(const MDBasicType *N) : DIType(N) {}
372 MDBasicType *get() const {
373 return cast_or_null<MDBasicType>(DIDescriptor::get());
375 operator MDBasicType *() const { return get(); }
376 MDBasicType *operator->() const { return get(); }
377 MDBasicType &operator*() const {
378 assert(get() && "Expected valid pointer");
382 unsigned getEncoding() const { return get()->getEncoding(); }
385 /// \brief A simple derived type
387 /// Like a const qualified type, a typedef, a pointer or reference, et cetera.
388 /// Or, a data member of a class/struct/union.
389 class DIDerivedType : public DIType {
391 DIDerivedType() = default;
392 DIDerivedType(const MDDerivedTypeBase *N) : DIType(N) {}
394 MDDerivedTypeBase *get() const {
395 return cast_or_null<MDDerivedTypeBase>(DIDescriptor::get());
397 operator MDDerivedTypeBase *() const { return get(); }
398 MDDerivedTypeBase *operator->() const { return get(); }
399 MDDerivedTypeBase &operator*() const {
400 assert(get() && "Expected valid pointer");
404 DITypeRef getTypeDerivedFrom() const {
405 return DITypeRef::get(get()->getBaseType());
408 /// \brief Return property node, if this ivar is associated with one.
409 MDNode *getObjCProperty() const {
410 if (auto *N = dyn_cast<MDDerivedType>(get()))
411 return dyn_cast_or_null<MDNode>(N->getExtraData());
415 DITypeRef getClassType() const {
416 assert(getTag() == dwarf::DW_TAG_ptr_to_member_type);
417 if (auto *N = dyn_cast<MDDerivedType>(get()))
418 return DITypeRef::get(N->getExtraData());
419 return DITypeRef::get(nullptr);
422 Constant *getConstant() const {
423 assert((getTag() == dwarf::DW_TAG_member) && isStaticMember());
424 if (auto *N = dyn_cast<MDDerivedType>(get()))
425 if (auto *C = dyn_cast_or_null<ConstantAsMetadata>(N->getExtraData()))
426 return C->getValue();
432 /// \brief Types that refer to multiple other types.
434 /// This descriptor holds a type that can refer to multiple other types, like a
435 /// function or struct.
437 /// DICompositeType is derived from DIDerivedType because some
438 /// composite types (such as enums) can be derived from basic types
439 // FIXME: Make this derive from DIType directly & just store the
440 // base type in a single DIType field.
441 class DICompositeType : public DIDerivedType {
442 friend class DIBuilder;
444 /// \brief Set the array of member DITypes.
445 void setArraysHelper(MDNode *Elements, MDNode *TParams);
448 DICompositeType() = default;
449 DICompositeType(const MDCompositeTypeBase *N) : DIDerivedType(N) {}
451 MDCompositeTypeBase *get() const {
452 return cast_or_null<MDCompositeTypeBase>(DIDescriptor::get());
454 operator MDCompositeTypeBase *() const { return get(); }
455 MDCompositeTypeBase *operator->() const { return get(); }
456 MDCompositeTypeBase &operator*() const {
457 assert(get() && "Expected valid pointer");
461 DIArray getElements() const {
462 assert(!isa<MDSubroutineType>(*this) && "no elements for DISubroutineType");
463 return DIArray(get()->getElements());
467 template <typename T>
468 void setArrays(DITypedArray<T> Elements, DIArray TParams = DIArray()) {
470 (!TParams || DbgNode->getNumOperands() == 8) &&
471 "If you're setting the template parameters this should include a slot "
473 setArraysHelper(Elements, TParams);
477 unsigned getRunTimeLang() const { return get()->getRuntimeLang(); }
478 DITypeRef getContainingType() const {
479 return DITypeRef::get(get()->getVTableHolder());
483 /// \brief Set the containing type.
484 void setContainingType(DICompositeType ContainingType);
487 DIArray getTemplateParams() const {
488 return DIArray(get()->getTemplateParams());
490 MDString *getIdentifier() const { return get()->getRawIdentifier(); }
493 class DISubroutineType : public DICompositeType {
495 DISubroutineType() = default;
496 DISubroutineType(const MDSubroutineType *N) : DICompositeType(N) {}
498 MDSubroutineType *get() const {
499 return cast_or_null<MDSubroutineType>(DIDescriptor::get());
501 operator MDSubroutineType *() const { return get(); }
502 MDSubroutineType *operator->() const { return get(); }
503 MDSubroutineType &operator*() const {
504 assert(get() && "Expected valid pointer");
508 DITypedArray<DITypeRef> getTypeArray() const {
509 return DITypedArray<DITypeRef>(get()->getTypeArray());
513 /// \brief This is a wrapper for a file.
514 class DIFile : public DIScope {
517 DIFile(const MDFile *N) : DIScope(N) {}
519 MDFile *get() const { return cast_or_null<MDFile>(DIDescriptor::get()); }
520 operator MDFile *() const { return get(); }
521 MDFile *operator->() const { return get(); }
522 MDFile &operator*() const {
523 assert(get() && "Expected valid pointer");
527 /// \brief Retrieve the MDNode for the directory/file pair.
528 MDNode *getFileNode() const { return get(); }
531 /// \brief A wrapper for a compile unit.
532 class DICompileUnit : public DIScope {
534 DICompileUnit() = default;
535 DICompileUnit(const MDCompileUnit *N) : DIScope(N) {}
537 MDCompileUnit *get() const {
538 return cast_or_null<MDCompileUnit>(DIDescriptor::get());
540 operator MDCompileUnit *() const { return get(); }
541 MDCompileUnit *operator->() const { return get(); }
542 MDCompileUnit &operator*() const {
543 assert(get() && "Expected valid pointer");
547 dwarf::SourceLanguage getLanguage() const {
548 return static_cast<dwarf::SourceLanguage>(get()->getSourceLanguage());
550 StringRef getProducer() const { return get()->getProducer(); }
551 bool isOptimized() const { return get()->isOptimized(); }
552 StringRef getFlags() const { return get()->getFlags(); }
553 unsigned getRunTimeVersion() const { return get()->getRuntimeVersion(); }
555 DIArray getEnumTypes() const { return DIArray(get()->getEnumTypes()); }
556 DIArray getRetainedTypes() const {
557 return DIArray(get()->getRetainedTypes());
559 DIArray getSubprograms() const { return DIArray(get()->getSubprograms()); }
560 DIArray getGlobalVariables() const {
561 return DIArray(get()->getGlobalVariables());
563 DIArray getImportedEntities() const {
564 return DIArray(get()->getImportedEntities());
567 void replaceSubprograms(DIArray Subprograms);
568 void replaceGlobalVariables(DIArray GlobalVariables);
570 StringRef getSplitDebugFilename() const {
571 return get()->getSplitDebugFilename();
573 unsigned getEmissionKind() const { return get()->getEmissionKind(); }
576 /// \brief This is a wrapper for a subprogram (e.g. a function).
577 class DISubprogram : public DIScope {
579 DISubprogram() = default;
580 DISubprogram(const MDSubprogram *N) : DIScope(N) {}
582 MDSubprogram *get() const {
583 return cast_or_null<MDSubprogram>(DIDescriptor::get());
585 operator MDSubprogram *() const { return get(); }
586 MDSubprogram *operator->() const { return get(); }
587 MDSubprogram &operator*() const {
588 assert(get() && "Expected valid pointer");
592 StringRef getName() const { return get()->getName(); }
593 StringRef getDisplayName() const { return get()->getDisplayName(); }
594 StringRef getLinkageName() const { return get()->getLinkageName(); }
595 unsigned getLineNumber() const { return get()->getLine(); }
597 /// \brief Check if this is local (like 'static' in C).
598 unsigned isLocalToUnit() const { return get()->isLocalToUnit(); }
599 unsigned isDefinition() const { return get()->isDefinition(); }
601 unsigned getVirtuality() const { return get()->getVirtuality(); }
602 unsigned getVirtualIndex() const { return get()->getVirtualIndex(); }
604 unsigned getFlags() const { return get()->getFlags(); }
606 unsigned isOptimized() const { return get()->isOptimized(); }
608 /// \brief Get the beginning of the scope of the function (not the name).
609 unsigned getScopeLineNumber() const { return get()->getScopeLine(); }
611 DIScopeRef getContext() const { return DIScopeRef::get(get()->getScope()); }
612 DISubroutineType getType() const {
613 return DISubroutineType(get()->getType());
616 DITypeRef getContainingType() const {
617 return DITypeRef::get(get()->getContainingType());
620 /// \brief Check if this provides debugging information for the function F.
621 bool describes(const Function *F);
623 Function *getFunction() const;
625 void replaceFunction(Function *F) {
627 N->replaceFunction(F);
629 DIArray getTemplateParams() const {
630 return DIArray(get()->getTemplateParams());
632 DISubprogram getFunctionDeclaration() const {
633 return DISubprogram(get()->getDeclaration());
635 MDNode *getVariablesNodes() const { return getVariables(); }
636 DIArray getVariables() const { return DIArray(get()->getVariables()); }
638 unsigned isArtificial() const { return (getFlags() & FlagArtificial) != 0; }
639 /// \brief Check for the "private" access specifier.
640 bool isPrivate() const {
641 return (getFlags() & FlagAccessibility) == FlagPrivate;
643 /// \brief Check for the "protected" access specifier.
644 bool isProtected() const {
645 return (getFlags() & FlagAccessibility) == FlagProtected;
647 /// \brief Check for the "public" access specifier.
648 bool isPublic() const {
649 return (getFlags() & FlagAccessibility) == FlagPublic;
651 /// \brief Check for "explicit".
652 bool isExplicit() const { return (getFlags() & FlagExplicit) != 0; }
653 /// \brief Check if this is prototyped.
654 bool isPrototyped() const { return (getFlags() & FlagPrototyped) != 0; }
656 /// \brief Check if this is reference-qualified.
658 /// Return true if this subprogram is a C++11 reference-qualified non-static
659 /// member function (void foo() &).
660 unsigned isLValueReference() const {
661 return (getFlags() & FlagLValueReference) != 0;
664 /// \brief Check if this is rvalue-reference-qualified.
666 /// Return true if this subprogram is a C++11 rvalue-reference-qualified
667 /// non-static member function (void foo() &&).
668 unsigned isRValueReference() const {
669 return (getFlags() & FlagRValueReference) != 0;
673 /// \brief This is a wrapper for a lexical block.
674 class DILexicalBlock : public DIScope {
676 DILexicalBlock() = default;
677 DILexicalBlock(const MDLexicalBlockBase *N) : DIScope(N) {}
679 MDLexicalBlockBase *get() const {
680 return cast_or_null<MDLexicalBlockBase>(DIDescriptor::get());
682 operator MDLexicalBlockBase *() const { return get(); }
683 MDLexicalBlockBase *operator->() const { return get(); }
684 MDLexicalBlockBase &operator*() const {
685 assert(get() && "Expected valid pointer");
689 DIScope getContext() const { return DIScope(get()->getScope()); }
690 unsigned getLineNumber() const {
691 if (auto *N = dyn_cast<MDLexicalBlock>(get()))
695 unsigned getColumnNumber() const {
696 if (auto *N = dyn_cast<MDLexicalBlock>(get()))
697 return N->getColumn();
702 /// \brief This is a wrapper for a lexical block with a filename change.
703 class DILexicalBlockFile : public DIScope {
705 DILexicalBlockFile() = default;
706 DILexicalBlockFile(const MDLexicalBlockFile *N) : DIScope(N) {}
708 MDLexicalBlockFile *get() const {
709 return cast_or_null<MDLexicalBlockFile>(DIDescriptor::get());
711 operator MDLexicalBlockFile *() const { return get(); }
712 MDLexicalBlockFile *operator->() const { return get(); }
713 MDLexicalBlockFile &operator*() const {
714 assert(get() && "Expected valid pointer");
718 DIScope getContext() const { return get()->getScope(); }
719 unsigned getDiscriminator() const { return get()->getDiscriminator(); }
722 /// \brief A wrapper for a C++ style name space.
723 class DINameSpace : public DIScope {
725 DINameSpace() = default;
726 DINameSpace(const MDNamespace *N) : DIScope(N) {}
728 MDNamespace *get() const {
729 return cast_or_null<MDNamespace>(DIDescriptor::get());
731 operator MDNamespace *() const { return get(); }
732 MDNamespace *operator->() const { return get(); }
733 MDNamespace &operator*() const {
734 assert(get() && "Expected valid pointer");
738 StringRef getName() const { return get()->getName(); }
739 unsigned getLineNumber() const { return get()->getLine(); }
740 DIScope getContext() const { return DIScope(get()->getScope()); }
743 /// \brief This is a wrapper for template type parameter.
744 class DITemplateTypeParameter : public DIDescriptor {
746 DITemplateTypeParameter() = default;
747 DITemplateTypeParameter(const MDTemplateTypeParameter *N) : DIDescriptor(N) {}
749 MDTemplateTypeParameter *get() const {
750 return cast_or_null<MDTemplateTypeParameter>(DIDescriptor::get());
752 operator MDTemplateTypeParameter *() const { return get(); }
753 MDTemplateTypeParameter *operator->() const { return get(); }
754 MDTemplateTypeParameter &operator*() const {
755 assert(get() && "Expected valid pointer");
759 StringRef getName() const { return get()->getName(); }
761 DITypeRef getType() const { return DITypeRef::get(get()->getType()); }
764 /// \brief This is a wrapper for template value parameter.
765 class DITemplateValueParameter : public DIDescriptor {
767 DITemplateValueParameter() = default;
768 DITemplateValueParameter(const MDTemplateValueParameter *N)
771 MDTemplateValueParameter *get() const {
772 return cast_or_null<MDTemplateValueParameter>(DIDescriptor::get());
774 operator MDTemplateValueParameter *() const { return get(); }
775 MDTemplateValueParameter *operator->() const { return get(); }
776 MDTemplateValueParameter &operator*() const {
777 assert(get() && "Expected valid pointer");
781 StringRef getName() const { return get()->getName(); }
782 DITypeRef getType() const { return DITypeRef::get(get()->getType()); }
783 Metadata *getValue() const { return get()->getValue(); }
786 /// \brief This is a wrapper for a global variable.
787 class DIGlobalVariable : public DIDescriptor {
788 DIFile getFile() const { return DIFile(get()->getFile()); }
791 DIGlobalVariable() = default;
792 DIGlobalVariable(const MDGlobalVariable *N) : DIDescriptor(N) {}
794 MDGlobalVariable *get() const {
795 return cast_or_null<MDGlobalVariable>(DIDescriptor::get());
797 operator MDGlobalVariable *() const { return get(); }
798 MDGlobalVariable *operator->() const { return get(); }
799 MDGlobalVariable &operator*() const {
800 assert(get() && "Expected valid pointer");
804 StringRef getName() const { return get()->getName(); }
805 StringRef getDisplayName() const { return get()->getDisplayName(); }
806 StringRef getLinkageName() const { return get()->getLinkageName(); }
807 unsigned getLineNumber() const { return get()->getLine(); }
808 unsigned isLocalToUnit() const { return get()->isLocalToUnit(); }
809 unsigned isDefinition() const { return get()->isDefinition(); }
811 DIScope getContext() const { return DIScope(get()->getScope()); }
812 StringRef getFilename() const { return getFile().getFilename(); }
813 StringRef getDirectory() const { return getFile().getDirectory(); }
814 DITypeRef getType() const { return DITypeRef::get(get()->getType()); }
816 GlobalVariable *getGlobal() const;
817 Constant *getConstant() const {
819 if (auto *C = dyn_cast_or_null<ConstantAsMetadata>(N->getVariable()))
820 return C->getValue();
823 DIDerivedType getStaticDataMemberDeclaration() const {
824 return DIDerivedType(get()->getStaticDataMemberDeclaration());
828 /// \brief This is a wrapper for a variable (e.g. parameter, local, global etc).
829 class DIVariable : public DIDescriptor {
830 unsigned getFlags() const { return get()->getFlags(); }
833 DIVariable() = default;
834 DIVariable(const MDLocalVariable *N) : DIDescriptor(N) {}
836 MDLocalVariable *get() const {
837 return cast_or_null<MDLocalVariable>(DIDescriptor::get());
839 operator MDLocalVariable *() const { return get(); }
840 MDLocalVariable *operator->() const { return get(); }
841 MDLocalVariable &operator*() const {
842 assert(get() && "Expected valid pointer");
846 StringRef getName() const { return get()->getName(); }
847 unsigned getLineNumber() const { return get()->getLine(); }
848 unsigned getArgNumber() const { return get()->getArg(); }
850 DIScope getContext() const { return DIScope(get()->getScope()); }
851 DIFile getFile() const { return DIFile(get()->getFile()); }
852 DITypeRef getType() const { return DITypeRef::get(get()->getType()); }
854 /// \brief Return true if this variable is marked as "artificial".
855 bool isArtificial() const {
856 return (getFlags() & FlagArtificial) != 0;
859 bool isObjectPointer() const {
860 return (getFlags() & FlagObjectPointer) != 0;
863 /// \brief If this variable is inlined then return inline location.
864 MDNode *getInlinedAt() const { return DIDescriptor(get()->getInlinedAt()); }
866 /// \brief Check if this is a "__block" variable (Apple Blocks).
867 bool isBlockByrefVariable(const DITypeIdentifierMap &Map) const {
868 return (getType().resolve(Map)).isBlockByrefStruct();
871 /// \brief Check if this is an inlined function argument.
872 bool isInlinedFnArgument(const Function *CurFn);
874 /// \brief Return the size reported by the variable's type.
875 unsigned getSizeInBits(const DITypeIdentifierMap &Map);
877 void printExtendedName(raw_ostream &OS) const;
880 /// \brief A complex location expression in postfix notation.
882 /// This is (almost) a DWARF expression that modifies the location of a
883 /// variable or (or the location of a single piece of a variable).
885 /// FIXME: Instead of DW_OP_plus taking an argument, this should use DW_OP_const
886 /// and have DW_OP_plus consume the topmost elements on the stack.
887 class DIExpression : public DIDescriptor {
889 DIExpression() = default;
890 DIExpression(const MDExpression *N) : DIDescriptor(N) {}
892 MDExpression *get() const {
893 return cast_or_null<MDExpression>(DIDescriptor::get());
895 operator MDExpression *() const { return get(); }
896 MDExpression *operator->() const { return get(); }
897 MDExpression &operator*() const {
898 assert(get() && "Expected valid pointer");
902 /// \brief Return the number of elements in the complex expression.
903 unsigned getNumElements() const { return get()->getNumElements(); }
905 /// \brief return the Idx'th complex address element.
906 uint64_t getElement(unsigned I) const { return get()->getElement(I); }
908 /// \brief Return whether this is a piece of an aggregate variable.
909 bool isBitPiece() const;
910 /// \brief Return the offset of this piece in bits.
911 uint64_t getBitPieceOffset() const;
912 /// \brief Return the size of this piece in bits.
913 uint64_t getBitPieceSize() const;
916 /// \brief A lightweight wrapper around an element of a DIExpression.
918 friend class iterator;
919 MDExpression::element_iterator I;
921 Operand(MDExpression::element_iterator I) : I(I) {}
923 /// \brief Operands such as DW_OP_piece have explicit (non-stack) arguments.
924 /// Argument 0 is the operand itself.
925 uint64_t getArg(unsigned N) const {
926 MDExpression::element_iterator In = I;
930 operator uint64_t () const { return *I; }
931 /// \brief Returns underlying MDExpression::element_iterator.
932 const MDExpression::element_iterator &getBase() const { return I; }
933 /// \brief Returns the next operand.
934 iterator getNext() const;
937 /// \brief An iterator for DIExpression elements.
938 class iterator : public std::iterator<std::input_iterator_tag, StringRef,
939 unsigned, const Operand*, Operand> {
940 friend class Operand;
941 MDExpression::element_iterator I;
945 iterator(MDExpression::element_iterator I) : I(I) {}
946 const Operand &operator*() { return Tmp = Operand(I); }
947 const Operand *operator->() { return &(Tmp = Operand(I)); }
948 iterator &operator++() {
952 iterator operator++(int) {
957 bool operator==(const iterator &X) const { return I == X.I; }
958 bool operator!=(const iterator &X) const { return !(*this == X); }
963 case dwarf::DW_OP_bit_piece: std::advance(I, 3); break;
964 case dwarf::DW_OP_plus: std::advance(I, 2); break;
965 case dwarf::DW_OP_deref: std::advance(I, 1); break;
967 llvm_unreachable("unsupported operand");
972 iterator begin() const { return get()->elements_begin(); }
973 iterator end() const { return get()->elements_end(); }
976 /// \brief This object holds location information.
978 /// This object is not associated with any DWARF tag.
979 class DILocation : public DIDescriptor {
981 DILocation() = default;
982 DILocation(const MDLocation *N) : DIDescriptor(N) {}
984 MDLocation *get() const {
985 return cast_or_null<MDLocation>(DIDescriptor::get());
987 operator MDLocation *() const { return get(); }
988 MDLocation *operator->() const { return get(); }
989 MDLocation &operator*() const {
990 assert(get() && "Expected valid pointer");
994 unsigned getLineNumber() const { return get()->getLine(); }
995 unsigned getColumnNumber() const { return get()->getColumn(); }
996 DIScope getScope() const { return DIScope(get()->getScope()); }
997 DILocation getOrigLocation() const {
998 return DILocation(get()->getInlinedAt());
1000 StringRef getFilename() const { return getScope().getFilename(); }
1001 StringRef getDirectory() const { return getScope().getDirectory(); }
1002 bool atSameLineAs(const DILocation &Other) const {
1003 return (getLineNumber() == Other.getLineNumber() &&
1004 getFilename() == Other.getFilename());
1006 /// \brief Get the DWAF discriminator.
1008 /// DWARF discriminators are used to distinguish identical file locations for
1009 /// instructions that are on different basic blocks. If two instructions are
1010 /// inside the same lexical block and are in different basic blocks, we
1011 /// create a new lexical block with identical location as the original but
1012 /// with a different discriminator value
1013 /// (lib/Transforms/Util/AddDiscriminators.cpp for details).
1014 unsigned getDiscriminator() const {
1015 // Since discriminators are associated with lexical blocks, make
1016 // sure this location is a lexical block before retrieving its
1018 if (auto *F = dyn_cast<MDLexicalBlockFile>(get()->getScope()))
1019 return F->getDiscriminator();
1023 /// \brief Generate a new discriminator value for this location.
1024 unsigned computeNewDiscriminator(LLVMContext &Ctx);
1026 /// \brief Return a copy of this location with a different scope.
1027 DILocation copyWithNewScope(LLVMContext &Ctx, DILexicalBlockFile NewScope);
1030 class DIObjCProperty : public DIDescriptor {
1032 DIObjCProperty() = default;
1033 DIObjCProperty(const MDObjCProperty *N) : DIDescriptor(N) {}
1035 MDObjCProperty *get() const {
1036 return cast_or_null<MDObjCProperty>(DIDescriptor::get());
1038 operator MDObjCProperty *() const { return get(); }
1039 MDObjCProperty *operator->() const { return get(); }
1040 MDObjCProperty &operator*() const {
1041 assert(get() && "Expected valid pointer");
1045 StringRef getObjCPropertyName() const { return get()->getName(); }
1046 DIFile getFile() const { return DIFile(get()->getFile()); }
1047 unsigned getLineNumber() const { return get()->getLine(); }
1049 StringRef getObjCPropertyGetterName() const { return get()->getGetterName(); }
1050 StringRef getObjCPropertySetterName() const { return get()->getSetterName(); }
1051 unsigned getAttributes() const { return get()->getAttributes(); }
1052 bool isReadOnlyObjCProperty() const {
1053 return (getAttributes() & dwarf::DW_APPLE_PROPERTY_readonly) != 0;
1055 bool isReadWriteObjCProperty() const {
1056 return (getAttributes() & dwarf::DW_APPLE_PROPERTY_readwrite) != 0;
1058 bool isAssignObjCProperty() const {
1059 return (getAttributes() & dwarf::DW_APPLE_PROPERTY_assign) != 0;
1061 bool isRetainObjCProperty() const {
1062 return (getAttributes() & dwarf::DW_APPLE_PROPERTY_retain) != 0;
1064 bool isCopyObjCProperty() const {
1065 return (getAttributes() & dwarf::DW_APPLE_PROPERTY_copy) != 0;
1067 bool isNonAtomicObjCProperty() const {
1068 return (getAttributes() & dwarf::DW_APPLE_PROPERTY_nonatomic) != 0;
1071 /// \brief Get the type.
1073 /// \note Objective-C doesn't have an ODR, so there is no benefit in storing
1074 /// the type as a DITypeRef here.
1075 DIType getType() const { return DIType(get()->getType()); }
1078 /// \brief An imported module (C++ using directive or similar).
1079 class DIImportedEntity : public DIDescriptor {
1081 DIImportedEntity() = default;
1082 DIImportedEntity(const MDImportedEntity *N) : DIDescriptor(N) {}
1084 MDImportedEntity *get() const {
1085 return cast_or_null<MDImportedEntity>(DIDescriptor::get());
1087 operator MDImportedEntity *() const { return get(); }
1088 MDImportedEntity *operator->() const { return get(); }
1089 MDImportedEntity &operator*() const {
1090 assert(get() && "Expected valid pointer");
1094 DIScope getContext() const { return DIScope(get()->getScope()); }
1095 DIDescriptorRef getEntity() const {
1096 return DIDescriptorRef::get(get()->getEntity());
1098 unsigned getLineNumber() const { return get()->getLine(); }
1099 StringRef getName() const { return get()->getName(); }
1102 #define SIMPLIFY_DESCRIPTOR(DESC) \
1103 template <> struct simplify_type<const DESC> { \
1104 typedef Metadata *SimpleType; \
1105 static SimpleType getSimplifiedValue(const DESC &DI) { return DI; } \
1107 template <> struct simplify_type<DESC> : simplify_type<const DESC> {};
1108 SIMPLIFY_DESCRIPTOR(DIDescriptor)
1109 SIMPLIFY_DESCRIPTOR(DISubrange)
1110 SIMPLIFY_DESCRIPTOR(DIEnumerator)
1111 SIMPLIFY_DESCRIPTOR(DIScope)
1112 SIMPLIFY_DESCRIPTOR(DIType)
1113 SIMPLIFY_DESCRIPTOR(DIBasicType)
1114 SIMPLIFY_DESCRIPTOR(DIDerivedType)
1115 SIMPLIFY_DESCRIPTOR(DICompositeType)
1116 SIMPLIFY_DESCRIPTOR(DISubroutineType)
1117 SIMPLIFY_DESCRIPTOR(DIFile)
1118 SIMPLIFY_DESCRIPTOR(DICompileUnit)
1119 SIMPLIFY_DESCRIPTOR(DISubprogram)
1120 SIMPLIFY_DESCRIPTOR(DILexicalBlock)
1121 SIMPLIFY_DESCRIPTOR(DILexicalBlockFile)
1122 SIMPLIFY_DESCRIPTOR(DINameSpace)
1123 SIMPLIFY_DESCRIPTOR(DITemplateTypeParameter)
1124 SIMPLIFY_DESCRIPTOR(DITemplateValueParameter)
1125 SIMPLIFY_DESCRIPTOR(DIGlobalVariable)
1126 SIMPLIFY_DESCRIPTOR(DIVariable)
1127 SIMPLIFY_DESCRIPTOR(DIExpression)
1128 SIMPLIFY_DESCRIPTOR(DILocation)
1129 SIMPLIFY_DESCRIPTOR(DIObjCProperty)
1130 SIMPLIFY_DESCRIPTOR(DIImportedEntity)
1131 #undef SIMPLIFY_DESCRIPTOR
1133 /// \brief Find subprogram that is enclosing this scope.
1134 DISubprogram getDISubprogram(const MDNode *Scope);
1136 /// \brief Find debug info for a given function.
1137 /// \returns a valid DISubprogram, if found. Otherwise, it returns an empty
1139 DISubprogram getDISubprogram(const Function *F);
1141 /// \brief Find underlying composite type.
1142 DICompositeType getDICompositeType(DIType T);
1144 /// \brief Create a new inlined variable based on current variable.
1146 /// @param DV Current Variable.
1147 /// @param InlinedScope Location at current variable is inlined.
1148 DIVariable createInlinedVariable(MDNode *DV, MDNode *InlinedScope,
1149 LLVMContext &VMContext);
1151 /// \brief Remove inlined scope from the variable.
1152 DIVariable cleanseInlinedVariable(MDNode *DV, LLVMContext &VMContext);
1154 /// \brief Generate map by visiting all retained types.
1155 DITypeIdentifierMap generateDITypeIdentifierMap(const NamedMDNode *CU_Nodes);
1157 /// \brief Strip debug info in the module if it exists.
1159 /// To do this, we remove all calls to the debugger intrinsics and any named
1160 /// metadata for debugging. We also remove debug locations for instructions.
1161 /// Return true if module is modified.
1162 bool StripDebugInfo(Module &M);
1163 bool stripDebugInfo(Function &F);
1165 /// \brief Return Debug Info Metadata Version by checking module flags.
1166 unsigned getDebugMetadataVersionFromModule(const Module &M);
1168 /// \brief Utility to find all debug info in a module.
1170 /// DebugInfoFinder tries to list all debug info MDNodes used in a module. To
1171 /// list debug info MDNodes used by an instruction, DebugInfoFinder uses
1172 /// processDeclare, processValue and processLocation to handle DbgDeclareInst,
1173 /// DbgValueInst and DbgLoc attached to instructions. processModule will go
1174 /// through all DICompileUnits in llvm.dbg.cu and list debug info MDNodes
1175 /// used by the CUs.
1176 class DebugInfoFinder {
1178 DebugInfoFinder() : TypeMapInitialized(false) {}
1180 /// \brief Process entire module and collect debug info anchors.
1181 void processModule(const Module &M);
1183 /// \brief Process DbgDeclareInst.
1184 void processDeclare(const Module &M, const DbgDeclareInst *DDI);
1185 /// \brief Process DbgValueInst.
1186 void processValue(const Module &M, const DbgValueInst *DVI);
1187 /// \brief Process DILocation.
1188 void processLocation(const Module &M, DILocation Loc);
1190 /// \brief Clear all lists.
1194 void InitializeTypeMap(const Module &M);
1196 void processType(DIType DT);
1197 void processSubprogram(DISubprogram SP);
1198 void processScope(DIScope Scope);
1199 bool addCompileUnit(DICompileUnit CU);
1200 bool addGlobalVariable(DIGlobalVariable DIG);
1201 bool addSubprogram(DISubprogram SP);
1202 bool addType(DIType DT);
1203 bool addScope(DIScope Scope);
1206 typedef SmallVectorImpl<DICompileUnit>::const_iterator compile_unit_iterator;
1207 typedef SmallVectorImpl<DISubprogram>::const_iterator subprogram_iterator;
1208 typedef SmallVectorImpl<DIGlobalVariable>::const_iterator
1209 global_variable_iterator;
1210 typedef SmallVectorImpl<DIType>::const_iterator type_iterator;
1211 typedef SmallVectorImpl<DIScope>::const_iterator scope_iterator;
1213 iterator_range<compile_unit_iterator> compile_units() const {
1214 return iterator_range<compile_unit_iterator>(CUs.begin(), CUs.end());
1217 iterator_range<subprogram_iterator> subprograms() const {
1218 return iterator_range<subprogram_iterator>(SPs.begin(), SPs.end());
1221 iterator_range<global_variable_iterator> global_variables() const {
1222 return iterator_range<global_variable_iterator>(GVs.begin(), GVs.end());
1225 iterator_range<type_iterator> types() const {
1226 return iterator_range<type_iterator>(TYs.begin(), TYs.end());
1229 iterator_range<scope_iterator> scopes() const {
1230 return iterator_range<scope_iterator>(Scopes.begin(), Scopes.end());
1233 unsigned compile_unit_count() const { return CUs.size(); }
1234 unsigned global_variable_count() const { return GVs.size(); }
1235 unsigned subprogram_count() const { return SPs.size(); }
1236 unsigned type_count() const { return TYs.size(); }
1237 unsigned scope_count() const { return Scopes.size(); }
1240 SmallVector<DICompileUnit, 8> CUs;
1241 SmallVector<DISubprogram, 8> SPs;
1242 SmallVector<DIGlobalVariable, 8> GVs;
1243 SmallVector<DIType, 8> TYs;
1244 SmallVector<DIScope, 8> Scopes;
1245 SmallPtrSet<MDNode *, 64> NodesSeen;
1246 DITypeIdentifierMap TypeIdentifierMap;
1248 /// \brief Specify if TypeIdentifierMap is initialized.
1249 bool TypeMapInitialized;
1252 DenseMap<const Function *, DISubprogram> makeSubprogramMap(const Module &M);
1254 } // end namespace llvm