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/Metadata.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 class DIHeaderFieldIterator
62 : public std::iterator<std::forward_iterator_tag, StringRef, std::ptrdiff_t,
63 const StringRef *, StringRef> {
68 DIHeaderFieldIterator() {}
69 DIHeaderFieldIterator(StringRef Header)
70 : Header(Header), Current(Header.slice(0, Header.find('\0'))) {}
71 StringRef operator*() const { return Current; }
72 const StringRef * operator->() const { return &Current; }
73 DIHeaderFieldIterator &operator++() {
77 DIHeaderFieldIterator operator++(int) {
78 DIHeaderFieldIterator X(*this);
82 bool operator==(const DIHeaderFieldIterator &X) const {
83 return Current.data() == X.Current.data();
85 bool operator!=(const DIHeaderFieldIterator &X) const {
89 StringRef getHeader() const { return Header; }
90 StringRef getCurrent() const { return Current; }
91 StringRef getPrefix() const {
92 if (Current.begin() == Header.begin())
94 return Header.slice(0, Current.begin() - Header.begin() - 1);
96 StringRef getSuffix() const {
97 if (Current.end() == Header.end())
99 return Header.slice(Current.end() - Header.begin() + 1, StringRef::npos);
104 assert(Current.data() != nullptr && "Cannot increment past the end");
105 StringRef Suffix = getSuffix();
106 Current = Suffix.slice(0, Suffix.find('\0'));
110 /// \brief A thin wraper around MDNode to access encoded debug info.
112 /// This should not be stored in a container, because the underlying MDNode may
113 /// change in certain situations.
115 // Befriends DIRef so DIRef can befriend the protected member
116 // function: getFieldAs<DIRef>.
117 template <typename T> friend class DIRef;
120 /// \brief Accessibility flags.
122 /// The three accessibility flags are mutually exclusive and rolled together
123 /// in the first two bits.
125 FlagAccessibility = 1 << 0 | 1 << 1,
130 FlagFwdDecl = 1 << 2,
131 FlagAppleBlock = 1 << 3,
132 FlagBlockByrefStruct = 1 << 4,
133 FlagVirtual = 1 << 5,
134 FlagArtificial = 1 << 6,
135 FlagExplicit = 1 << 7,
136 FlagPrototyped = 1 << 8,
137 FlagObjcClassComplete = 1 << 9,
138 FlagObjectPointer = 1 << 10,
139 FlagVector = 1 << 11,
140 FlagStaticMember = 1 << 12,
141 FlagLValueReference = 1 << 13,
142 FlagRValueReference = 1 << 14
146 const MDNode *DbgNode;
148 StringRef getStringField(unsigned Elt) const;
149 unsigned getUnsignedField(unsigned Elt) const {
150 return (unsigned)getUInt64Field(Elt);
152 uint64_t getUInt64Field(unsigned Elt) const;
153 int64_t getInt64Field(unsigned Elt) const;
154 DIDescriptor getDescriptorField(unsigned Elt) const;
156 template <typename DescTy> DescTy getFieldAs(unsigned Elt) const {
157 return DescTy(getDescriptorField(Elt));
160 GlobalVariable *getGlobalVariableField(unsigned Elt) const;
161 Constant *getConstantField(unsigned Elt) const;
162 Function *getFunctionField(unsigned Elt) const;
163 void replaceFunctionField(unsigned Elt, Function *F);
166 explicit DIDescriptor(const MDNode *N = nullptr) : DbgNode(N) {}
170 MDNode *get() const { return const_cast<MDNode *>(DbgNode); }
171 operator MDNode *() const { return get(); }
172 MDNode *operator->() const { return get(); }
174 // An explicit operator bool so that we can do testing of DI values
176 // FIXME: This operator bool isn't actually protecting anything at the
177 // moment due to the conversion operator above making DIDescriptor nodes
178 // implicitly convertable to bool.
179 LLVM_EXPLICIT operator bool() const { return DbgNode != nullptr; }
181 bool operator==(DIDescriptor Other) const { return DbgNode == Other.DbgNode; }
182 bool operator!=(DIDescriptor Other) const { return !operator==(Other); }
184 StringRef getHeader() const {
185 return getStringField(0);
188 size_t getNumHeaderFields() const {
189 return std::distance(DIHeaderFieldIterator(getHeader()),
190 DIHeaderFieldIterator());
193 DIHeaderFieldIterator getHeaderIterator(unsigned Index) const {
194 // Since callers expect an empty string for out-of-range accesses, we can't
195 // use std::advance() here.
196 for (DIHeaderFieldIterator I(getHeader()), E; I != E; ++I, --Index)
202 StringRef getHeaderField(unsigned Index) const {
203 return *getHeaderIterator(Index);
206 template <class T> T getHeaderFieldAs(unsigned Index) const {
208 if (getHeaderField(Index).getAsInteger(0, Int))
213 uint16_t getTag() const { return getHeaderFieldAs<uint16_t>(0); }
215 bool isDerivedType() const;
216 bool isCompositeType() const;
217 bool isSubroutineType() const;
218 bool isBasicType() const;
219 bool isVariable() const;
220 bool isSubprogram() const;
221 bool isGlobalVariable() const;
222 bool isScope() const;
224 bool isCompileUnit() const;
225 bool isNameSpace() const;
226 bool isLexicalBlockFile() const;
227 bool isLexicalBlock() const;
228 bool isSubrange() const;
229 bool isEnumerator() const;
231 bool isTemplateTypeParameter() const;
232 bool isTemplateValueParameter() const;
233 bool isObjCProperty() const;
234 bool isImportedEntity() const;
235 bool isExpression() const;
237 void print(raw_ostream &OS) const;
240 /// \brief Replace all uses of debug info referenced by this descriptor.
241 void replaceAllUsesWith(LLVMContext &VMContext, DIDescriptor D);
242 void replaceAllUsesWith(MDNode *D);
245 /// \brief This is used to represent ranges, for array bounds.
246 class DISubrange : public DIDescriptor {
247 friend class DIDescriptor;
248 void printInternal(raw_ostream &OS) const;
251 explicit DISubrange(const MDNode *N = nullptr) : DIDescriptor(N) {}
253 int64_t getLo() const { return getHeaderFieldAs<int64_t>(1); }
254 int64_t getCount() const { return getHeaderFieldAs<int64_t>(2); }
258 /// \brief This descriptor holds an array of nodes with type T.
259 template <typename T> class DITypedArray : public DIDescriptor {
261 explicit DITypedArray(const MDNode *N = nullptr) : DIDescriptor(N) {}
262 unsigned getNumElements() const {
263 return DbgNode ? DbgNode->getNumOperands() : 0;
265 T getElement(unsigned Idx) const {
266 return getFieldAs<T>(Idx);
270 typedef DITypedArray<DIDescriptor> DIArray;
272 /// \brief A wrapper for an enumerator (e.g. X and Y in 'enum {X,Y}').
274 /// FIXME: it seems strange that this doesn't have either a reference to the
275 /// type/precision or a file/line pair for location info.
276 class DIEnumerator : public DIDescriptor {
277 friend class DIDescriptor;
278 void printInternal(raw_ostream &OS) const;
281 explicit DIEnumerator(const MDNode *N = nullptr) : DIDescriptor(N) {}
283 StringRef getName() const { return getHeaderField(1); }
284 int64_t getEnumValue() const { return getHeaderFieldAs<int64_t>(2); }
288 template <typename T> class DIRef;
289 typedef DIRef<DIScope> DIScopeRef;
290 typedef DIRef<DIType> DITypeRef;
291 typedef DITypedArray<DITypeRef> DITypeArray;
293 /// \brief A base class for various scopes.
295 /// Although, implementation-wise, DIScope is the parent class of most
296 /// other DIxxx classes, including DIType and its descendants, most of
297 /// DIScope's descendants are not a substitutable subtype of
298 /// DIScope. The DIDescriptor::isScope() method only is true for
299 /// DIScopes that are scopes in the strict lexical scope sense
300 /// (DICompileUnit, DISubprogram, etc.), but not for, e.g., a DIType.
301 class DIScope : public DIDescriptor {
303 friend class DIDescriptor;
304 void printInternal(raw_ostream &OS) const;
307 explicit DIScope(const MDNode *N = nullptr) : DIDescriptor(N) {}
309 /// \brief Get the parent scope.
311 /// Gets the parent scope for this scope node or returns a default
312 /// constructed scope.
313 DIScopeRef getContext() const;
314 /// \brief Get the scope name.
316 /// If the scope node has a name, return that, else return an empty string.
317 StringRef getName() const;
318 StringRef getFilename() const;
319 StringRef getDirectory() const;
321 /// \brief Generate a reference to this DIScope.
323 /// Uses the type identifier instead of the actual MDNode if possible, to
324 /// help type uniquing.
325 DIScopeRef getRef() const;
328 /// \brief Represents reference to a DIDescriptor.
330 /// Abstracts over direct and identifier-based metadata references.
331 template <typename T> class DIRef {
332 template <typename DescTy>
333 friend DescTy DIDescriptor::getFieldAs(unsigned Elt) const;
334 friend DIScopeRef DIScope::getContext() const;
335 friend DIScopeRef DIScope::getRef() const;
338 /// \brief Val can be either a MDNode or a MDString.
340 /// In the latter, MDString specifies the type identifier.
342 explicit DIRef(const Metadata *V);
345 T resolve(const DITypeIdentifierMap &Map) const;
346 StringRef getName() const;
347 operator Metadata *() const { return const_cast<Metadata *>(Val); }
350 template <typename T>
351 T DIRef<T>::resolve(const DITypeIdentifierMap &Map) const {
355 if (const MDNode *MD = dyn_cast<MDNode>(Val))
358 const MDString *MS = cast<MDString>(Val);
359 // Find the corresponding MDNode.
360 DITypeIdentifierMap::const_iterator Iter = Map.find(MS);
361 assert(Iter != Map.end() && "Identifier not in the type map?");
362 assert(DIDescriptor(Iter->second).isType() &&
363 "MDNode in DITypeIdentifierMap should be a DIType.");
364 return T(Iter->second);
367 template <typename T> StringRef DIRef<T>::getName() const {
371 if (const MDNode *MD = dyn_cast<MDNode>(Val))
372 return T(MD).getName();
374 const MDString *MS = cast<MDString>(Val);
375 return MS->getString();
378 /// \brief Handle fields that are references to DIScopes.
379 template <> DIScopeRef DIDescriptor::getFieldAs<DIScopeRef>(unsigned Elt) const;
380 /// \brief Specialize DIRef constructor for DIScopeRef.
381 template <> DIRef<DIScope>::DIRef(const Metadata *V);
383 /// \brief Handle fields that are references to DITypes.
384 template <> DITypeRef DIDescriptor::getFieldAs<DITypeRef>(unsigned Elt) const;
385 /// \brief Specialize DIRef constructor for DITypeRef.
386 template <> DIRef<DIType>::DIRef(const Metadata *V);
388 /// \briefThis is a wrapper for a type.
390 /// FIXME: Types should be factored much better so that CV qualifiers and
391 /// others do not require a huge and empty descriptor full of zeros.
392 class DIType : public DIScope {
394 friend class DIDescriptor;
395 void printInternal(raw_ostream &OS) const;
398 explicit DIType(const MDNode *N = nullptr) : DIScope(N) {}
399 operator DITypeRef () const {
401 "constructing DITypeRef from an MDNode that is not a type");
402 return DITypeRef(&*getRef());
407 DIScopeRef getContext() const { return getFieldAs<DIScopeRef>(2); }
408 StringRef getName() const { return getHeaderField(1); }
409 unsigned getLineNumber() const {
410 return getHeaderFieldAs<unsigned>(2);
412 uint64_t getSizeInBits() const {
413 return getHeaderFieldAs<unsigned>(3);
415 uint64_t getAlignInBits() const {
416 return getHeaderFieldAs<unsigned>(4);
418 // FIXME: Offset is only used for DW_TAG_member nodes. Making every type
419 // carry this is just plain insane.
420 uint64_t getOffsetInBits() const {
421 return getHeaderFieldAs<unsigned>(5);
423 unsigned getFlags() const { return getHeaderFieldAs<unsigned>(6); }
424 bool isPrivate() const {
425 return (getFlags() & FlagAccessibility) == FlagPrivate;
427 bool isProtected() const {
428 return (getFlags() & FlagAccessibility) == FlagProtected;
430 bool isPublic() const {
431 return (getFlags() & FlagAccessibility) == FlagPublic;
433 bool isForwardDecl() const { return (getFlags() & FlagFwdDecl) != 0; }
434 bool isAppleBlockExtension() const {
435 return (getFlags() & FlagAppleBlock) != 0;
437 bool isBlockByrefStruct() const {
438 return (getFlags() & FlagBlockByrefStruct) != 0;
440 bool isVirtual() const { return (getFlags() & FlagVirtual) != 0; }
441 bool isArtificial() const { return (getFlags() & FlagArtificial) != 0; }
442 bool isObjectPointer() const { return (getFlags() & FlagObjectPointer) != 0; }
443 bool isObjcClassComplete() const {
444 return (getFlags() & FlagObjcClassComplete) != 0;
446 bool isVector() const { return (getFlags() & FlagVector) != 0; }
447 bool isStaticMember() const { return (getFlags() & FlagStaticMember) != 0; }
448 bool isLValueReference() const {
449 return (getFlags() & FlagLValueReference) != 0;
451 bool isRValueReference() const {
452 return (getFlags() & FlagRValueReference) != 0;
454 bool isValid() const { return DbgNode && isType(); }
457 /// \brief A basic type, like 'int' or 'float'.
458 class DIBasicType : public DIType {
460 explicit DIBasicType(const MDNode *N = nullptr) : DIType(N) {}
462 unsigned getEncoding() const { return getHeaderFieldAs<unsigned>(7); }
467 /// \brief A simple derived type
469 /// Like a const qualified type, a typedef, a pointer or reference, et cetera.
470 /// Or, a data member of a class/struct/union.
471 class DIDerivedType : public DIType {
472 friend class DIDescriptor;
473 void printInternal(raw_ostream &OS) const;
476 explicit DIDerivedType(const MDNode *N = nullptr) : DIType(N) {}
478 DITypeRef getTypeDerivedFrom() const { return getFieldAs<DITypeRef>(3); }
480 /// \brief Return property node, if this ivar is associated with one.
481 MDNode *getObjCProperty() const;
483 DITypeRef getClassType() const {
484 assert(getTag() == dwarf::DW_TAG_ptr_to_member_type);
485 return getFieldAs<DITypeRef>(4);
488 Constant *getConstant() const {
489 assert((getTag() == dwarf::DW_TAG_member) && isStaticMember());
490 return getConstantField(4);
496 /// \brief Types that refer to multiple other types.
498 /// This descriptor holds a type that can refer to multiple other types, like a
499 /// function or struct.
501 /// DICompositeType is derived from DIDerivedType because some
502 /// composite types (such as enums) can be derived from basic types
503 // FIXME: Make this derive from DIType directly & just store the
504 // base type in a single DIType field.
505 class DICompositeType : public DIDerivedType {
506 friend class DIBuilder;
507 friend class DIDescriptor;
508 void printInternal(raw_ostream &OS) const;
510 /// \brief Set the array of member DITypes.
511 void setArraysHelper(MDNode *Elements, MDNode *TParams);
514 explicit DICompositeType(const MDNode *N = nullptr) : DIDerivedType(N) {}
516 DIArray getElements() const {
517 assert(!isSubroutineType() && "no elements for DISubroutineType");
518 return getFieldAs<DIArray>(4);
522 template <typename T>
523 void setArrays(DITypedArray<T> Elements, DIArray TParams = DIArray()) {
524 assert((!TParams || DbgNode->getNumOperands() == 8) &&
525 "If you're setting the template parameters this should include a slot "
527 setArraysHelper(Elements, TParams);
531 unsigned getRunTimeLang() const {
532 return getHeaderFieldAs<unsigned>(7);
534 DITypeRef getContainingType() const { return getFieldAs<DITypeRef>(5); }
537 /// \brief Set the containing type.
538 void setContainingType(DICompositeType ContainingType);
541 DIArray getTemplateParams() const { return getFieldAs<DIArray>(6); }
542 MDString *getIdentifier() const;
547 class DISubroutineType : public DICompositeType {
549 explicit DISubroutineType(const MDNode *N = nullptr) : DICompositeType(N) {}
550 DITypedArray<DITypeRef> getTypeArray() const {
551 return getFieldAs<DITypedArray<DITypeRef>>(4);
555 /// \brief This is a wrapper for a file.
556 class DIFile : public DIScope {
557 friend class DIDescriptor;
560 explicit DIFile(const MDNode *N = nullptr) : DIScope(N) {}
562 /// \brief Retrieve the MDNode for the directory/file pair.
563 MDNode *getFileNode() const;
567 /// \brief A wrapper for a compile unit.
568 class DICompileUnit : public DIScope {
569 friend class DIDescriptor;
570 void printInternal(raw_ostream &OS) const;
573 explicit DICompileUnit(const MDNode *N = nullptr) : DIScope(N) {}
575 dwarf::SourceLanguage getLanguage() const {
576 return static_cast<dwarf::SourceLanguage>(getHeaderFieldAs<unsigned>(1));
578 StringRef getProducer() const { return getHeaderField(2); }
580 bool isOptimized() const { return getHeaderFieldAs<bool>(3) != 0; }
581 StringRef getFlags() const { return getHeaderField(4); }
582 unsigned getRunTimeVersion() const { return getHeaderFieldAs<unsigned>(5); }
584 DIArray getEnumTypes() const;
585 DIArray getRetainedTypes() const;
586 DIArray getSubprograms() const;
587 DIArray getGlobalVariables() const;
588 DIArray getImportedEntities() const;
590 void replaceSubprograms(DIArray Subprograms);
591 void replaceGlobalVariables(DIArray GlobalVariables);
593 StringRef getSplitDebugFilename() const { return getHeaderField(6); }
594 unsigned getEmissionKind() const { return getHeaderFieldAs<unsigned>(7); }
599 /// \brief This is a wrapper for a subprogram (e.g. a function).
600 class DISubprogram : public DIScope {
601 friend class DIDescriptor;
602 void printInternal(raw_ostream &OS) const;
605 explicit DISubprogram(const MDNode *N = nullptr) : DIScope(N) {}
607 StringRef getName() const { return getHeaderField(1); }
608 StringRef getDisplayName() const { return getHeaderField(2); }
609 StringRef getLinkageName() const { return getHeaderField(3); }
610 unsigned getLineNumber() const { return getHeaderFieldAs<unsigned>(4); }
612 /// \brief Check if this is local (like 'static' in C).
613 unsigned isLocalToUnit() const { return getHeaderFieldAs<unsigned>(5); }
614 unsigned isDefinition() const { return getHeaderFieldAs<unsigned>(6); }
616 unsigned getVirtuality() const { return getHeaderFieldAs<unsigned>(7); }
617 unsigned getVirtualIndex() const { return getHeaderFieldAs<unsigned>(8); }
619 unsigned getFlags() const { return getHeaderFieldAs<unsigned>(9); }
621 unsigned isOptimized() const { return getHeaderFieldAs<bool>(10); }
623 /// \brief Get the beginning of the scope of the function (not the name).
624 unsigned getScopeLineNumber() const { return getHeaderFieldAs<unsigned>(11); }
626 DIScopeRef getContext() const { return getFieldAs<DIScopeRef>(2); }
627 DISubroutineType getType() const { return getFieldAs<DISubroutineType>(3); }
629 DITypeRef getContainingType() const { return getFieldAs<DITypeRef>(4); }
633 /// \brief Check if this provides debugging information for the function F.
634 bool describes(const Function *F);
636 Function *getFunction() const { return getFunctionField(5); }
637 void replaceFunction(Function *F) { replaceFunctionField(5, F); }
638 DIArray getTemplateParams() const { return getFieldAs<DIArray>(6); }
639 DISubprogram getFunctionDeclaration() const {
640 return getFieldAs<DISubprogram>(7);
642 MDNode *getVariablesNodes() const;
643 DIArray getVariables() const;
645 unsigned isArtificial() const { return (getFlags() & FlagArtificial) != 0; }
646 /// \brief Check for the "private" access specifier.
647 bool isPrivate() const {
648 return (getFlags() & FlagAccessibility) == FlagPrivate;
650 /// \brief Check for the "protected" access specifier.
651 bool isProtected() const {
652 return (getFlags() & FlagAccessibility) == FlagProtected;
654 /// \brief Check for the "public" access specifier.
655 bool isPublic() const {
656 return (getFlags() & FlagAccessibility) == FlagPublic;
658 /// \brief Check for "explicit".
659 bool isExplicit() const { return (getFlags() & FlagExplicit) != 0; }
660 /// \brief Check if this is prototyped.
661 bool isPrototyped() const { return (getFlags() & FlagPrototyped) != 0; }
663 /// \brief Check if this is reference-qualified.
665 /// Return true if this subprogram is a C++11 reference-qualified non-static
666 /// member function (void foo() &).
667 unsigned isLValueReference() const {
668 return (getFlags() & FlagLValueReference) != 0;
671 /// \brief Check if this is rvalue-reference-qualified.
673 /// Return true if this subprogram is a C++11 rvalue-reference-qualified
674 /// non-static member function (void foo() &&).
675 unsigned isRValueReference() const {
676 return (getFlags() & FlagRValueReference) != 0;
681 /// \brief This is a wrapper for a lexical block.
682 class DILexicalBlock : public DIScope {
684 explicit DILexicalBlock(const MDNode *N = nullptr) : DIScope(N) {}
685 DIScope getContext() const { return getFieldAs<DIScope>(2); }
686 unsigned getLineNumber() const {
687 return getHeaderFieldAs<unsigned>(1);
689 unsigned getColumnNumber() const {
690 return getHeaderFieldAs<unsigned>(2);
695 /// \brief This is a wrapper for a lexical block with a filename change.
696 class DILexicalBlockFile : public DIScope {
698 explicit DILexicalBlockFile(const MDNode *N = nullptr) : DIScope(N) {}
699 DIScope getContext() const {
700 if (getScope().isSubprogram())
702 return getScope().getContext();
704 unsigned getLineNumber() const { return getScope().getLineNumber(); }
705 unsigned getColumnNumber() const { return getScope().getColumnNumber(); }
706 DILexicalBlock getScope() const { return getFieldAs<DILexicalBlock>(2); }
707 unsigned getDiscriminator() const { return getHeaderFieldAs<unsigned>(1); }
711 /// \brief A wrapper for a C++ style name space.
712 class DINameSpace : public DIScope {
713 friend class DIDescriptor;
714 void printInternal(raw_ostream &OS) const;
717 explicit DINameSpace(const MDNode *N = nullptr) : DIScope(N) {}
718 StringRef getName() const { return getHeaderField(1); }
719 unsigned getLineNumber() const { return getHeaderFieldAs<unsigned>(2); }
720 DIScope getContext() const { return getFieldAs<DIScope>(2); }
724 /// \brief This is a wrapper for template type parameter.
725 class DITemplateTypeParameter : public DIDescriptor {
727 explicit DITemplateTypeParameter(const MDNode *N = nullptr)
730 StringRef getName() const { return getHeaderField(1); }
731 unsigned getLineNumber() const { return getHeaderFieldAs<unsigned>(2); }
732 unsigned getColumnNumber() const { return getHeaderFieldAs<unsigned>(3); }
734 DIScopeRef getContext() const { return getFieldAs<DIScopeRef>(1); }
735 DITypeRef getType() const { return getFieldAs<DITypeRef>(2); }
736 StringRef getFilename() const { return getFieldAs<DIFile>(3).getFilename(); }
737 StringRef getDirectory() const {
738 return getFieldAs<DIFile>(3).getDirectory();
743 /// \brief This is a wrapper for template value parameter.
744 class DITemplateValueParameter : public DIDescriptor {
746 explicit DITemplateValueParameter(const MDNode *N = nullptr)
749 StringRef getName() const { return getHeaderField(1); }
750 unsigned getLineNumber() const { return getHeaderFieldAs<unsigned>(2); }
751 unsigned getColumnNumber() const { return getHeaderFieldAs<unsigned>(3); }
753 DIScopeRef getContext() const { return getFieldAs<DIScopeRef>(1); }
754 DITypeRef getType() const { return getFieldAs<DITypeRef>(2); }
755 Metadata *getValue() const;
756 StringRef getFilename() const { return getFieldAs<DIFile>(4).getFilename(); }
757 StringRef getDirectory() const {
758 return getFieldAs<DIFile>(4).getDirectory();
763 /// \brief This is a wrapper for a global variable.
764 class DIGlobalVariable : public DIDescriptor {
765 friend class DIDescriptor;
766 void printInternal(raw_ostream &OS) const;
769 explicit DIGlobalVariable(const MDNode *N = nullptr) : DIDescriptor(N) {}
771 StringRef getName() const { return getHeaderField(1); }
772 StringRef getDisplayName() const { return getHeaderField(2); }
773 StringRef getLinkageName() const { return getHeaderField(3); }
774 unsigned getLineNumber() const { return getHeaderFieldAs<unsigned>(4); }
775 unsigned isLocalToUnit() const { return getHeaderFieldAs<bool>(5); }
776 unsigned isDefinition() const { return getHeaderFieldAs<bool>(6); }
778 DIScope getContext() const { return getFieldAs<DIScope>(1); }
779 StringRef getFilename() const { return getFieldAs<DIFile>(2).getFilename(); }
780 StringRef getDirectory() const {
781 return getFieldAs<DIFile>(2).getDirectory();
783 DITypeRef getType() const { return getFieldAs<DITypeRef>(3); }
785 GlobalVariable *getGlobal() const { return getGlobalVariableField(4); }
786 Constant *getConstant() const { return getConstantField(4); }
787 DIDerivedType getStaticDataMemberDeclaration() const {
788 return getFieldAs<DIDerivedType>(5);
794 /// \brief This is a wrapper for a variable (e.g. parameter, local, global etc).
795 class DIVariable : public DIDescriptor {
796 friend class DIDescriptor;
797 void printInternal(raw_ostream &OS) const;
800 explicit DIVariable(const MDNode *N = nullptr) : DIDescriptor(N) {}
802 StringRef getName() const { return getHeaderField(1); }
803 unsigned getLineNumber() const {
804 // FIXME: Line number and arg number shouldn't be merged together like this.
805 return (getHeaderFieldAs<unsigned>(2) << 8) >> 8;
807 unsigned getArgNumber() const { return getHeaderFieldAs<unsigned>(2) >> 24; }
809 DIScope getContext() const { return getFieldAs<DIScope>(1); }
810 DIFile getFile() const { return getFieldAs<DIFile>(2); }
811 DITypeRef getType() const { return getFieldAs<DITypeRef>(3); }
813 /// \brief Return true if this variable is marked as "artificial".
814 bool isArtificial() const {
815 return (getHeaderFieldAs<unsigned>(3) & FlagArtificial) != 0;
818 bool isObjectPointer() const {
819 return (getHeaderFieldAs<unsigned>(3) & FlagObjectPointer) != 0;
822 /// \brief If this variable is inlined then return inline location.
823 MDNode *getInlinedAt() const;
827 /// \brief Check if this is a "__block" variable (Apple Blocks).
828 bool isBlockByrefVariable(const DITypeIdentifierMap &Map) const {
829 return (getType().resolve(Map)).isBlockByrefStruct();
832 /// \brief Check if this is an inlined function argument.
833 bool isInlinedFnArgument(const Function *CurFn);
835 /// \brief Return the size reported by the variable's type.
836 unsigned getSizeInBits(const DITypeIdentifierMap &Map);
838 void printExtendedName(raw_ostream &OS) const;
841 class DIExpressionIterator;
843 /// \brief A complex location expression.
844 class DIExpression : public DIDescriptor {
845 friend class DIDescriptor;
846 void printInternal(raw_ostream &OS) const;
849 explicit DIExpression(const MDNode *N = nullptr) : DIDescriptor(N) {}
853 /// \brief Return the number of elements in the complex expression.
854 unsigned getNumElements() const {
857 unsigned N = getNumHeaderFields();
858 assert(N > 0 && "missing tag");
862 /// \brief return the Idx'th complex address element.
863 uint64_t getElement(unsigned Idx) const;
865 /// \brief Return whether this is a piece of an aggregate variable.
866 bool isVariablePiece() const;
867 /// \brief Return the offset of this piece in bytes.
868 uint64_t getPieceOffset() const;
869 /// \brief Return the size of this piece in bytes.
870 uint64_t getPieceSize() const;
872 DIExpressionIterator begin() const;
873 DIExpressionIterator end() const;
876 /// \brief An iterator for DIExpression elments.
877 class DIExpressionIterator
878 : public std::iterator<std::forward_iterator_tag, StringRef, unsigned,
879 const uint64_t *, uint64_t> {
880 DIHeaderFieldIterator I;
881 DIExpressionIterator(DIHeaderFieldIterator I) : I(I) {}
883 DIExpressionIterator() {}
884 DIExpressionIterator(const DIExpression Expr)
885 : I(Expr.getHeader()) { ++I; }
886 uint64_t operator*() const {
888 if (I->getAsInteger(0, UInt))
892 DIExpressionIterator &operator++() {
896 DIExpressionIterator operator++(int) {
897 DIExpressionIterator X(*this);
901 bool operator==(const DIExpressionIterator &X) const {
904 bool operator!=(const DIExpressionIterator &X) const {
905 return !(*this == X);
908 uint64_t getArg(unsigned N) const {
911 return *DIExpressionIterator(In);
914 const DIHeaderFieldIterator& getBase() const { return I; }
919 case dwarf::DW_OP_piece: std::advance(I, 3); break;
920 case dwarf::DW_OP_plus: std::advance(I, 2); break;
921 case dwarf::DW_OP_deref: std::advance(I, 1); break;
923 assert("unsupported operand");
929 /// \brief This object holds location information.
931 /// This object is not associated with any DWARF tag.
932 class DILocation : public DIDescriptor {
934 explicit DILocation(const MDNode *N) : DIDescriptor(N) {}
936 unsigned getLineNumber() const {
937 if (auto *L = dyn_cast_or_null<MDLocation>(DbgNode))
941 unsigned getColumnNumber() const {
942 if (auto *L = dyn_cast_or_null<MDLocation>(DbgNode))
943 return L->getColumn();
946 DIScope getScope() const {
947 if (auto *L = dyn_cast_or_null<MDLocation>(DbgNode))
948 return DIScope(dyn_cast_or_null<MDNode>(L->getScope()));
949 return DIScope(nullptr);
951 DILocation getOrigLocation() const {
952 if (auto *L = dyn_cast_or_null<MDLocation>(DbgNode))
953 return DILocation(dyn_cast_or_null<MDNode>(L->getInlinedAt()));
954 return DILocation(nullptr);
956 StringRef getFilename() const { return getScope().getFilename(); }
957 StringRef getDirectory() const { return getScope().getDirectory(); }
959 bool atSameLineAs(const DILocation &Other) const {
960 return (getLineNumber() == Other.getLineNumber() &&
961 getFilename() == Other.getFilename());
963 /// \brief Get the DWAF discriminator.
965 /// DWARF discriminators are used to distinguish identical file locations for
966 /// instructions that are on different basic blocks. If two instructions are
967 /// inside the same lexical block and are in different basic blocks, we
968 /// create a new lexical block with identical location as the original but
969 /// with a different discriminator value
970 /// (lib/Transforms/Util/AddDiscriminators.cpp for details).
971 unsigned getDiscriminator() const {
972 // Since discriminators are associated with lexical blocks, make
973 // sure this location is a lexical block before retrieving its
975 return getScope().isLexicalBlockFile()
976 ? DILexicalBlockFile(
977 cast<MDNode>(cast<MDLocation>(DbgNode)->getScope()))
982 /// \brief Generate a new discriminator value for this location.
983 unsigned computeNewDiscriminator(LLVMContext &Ctx);
985 /// \brief Return a copy of this location with a different scope.
986 DILocation copyWithNewScope(LLVMContext &Ctx, DILexicalBlockFile NewScope);
989 class DIObjCProperty : public DIDescriptor {
990 friend class DIDescriptor;
991 void printInternal(raw_ostream &OS) const;
994 explicit DIObjCProperty(const MDNode *N) : DIDescriptor(N) {}
996 StringRef getObjCPropertyName() const { return getHeaderField(1); }
997 DIFile getFile() const { return getFieldAs<DIFile>(1); }
998 unsigned getLineNumber() const { return getHeaderFieldAs<unsigned>(2); }
1000 StringRef getObjCPropertyGetterName() const { return getHeaderField(3); }
1001 StringRef getObjCPropertySetterName() const { return getHeaderField(4); }
1002 unsigned getAttributes() const { return getHeaderFieldAs<unsigned>(5); }
1003 bool isReadOnlyObjCProperty() const {
1004 return (getAttributes() & dwarf::DW_APPLE_PROPERTY_readonly) != 0;
1006 bool isReadWriteObjCProperty() const {
1007 return (getAttributes() & dwarf::DW_APPLE_PROPERTY_readwrite) != 0;
1009 bool isAssignObjCProperty() const {
1010 return (getAttributes() & dwarf::DW_APPLE_PROPERTY_assign) != 0;
1012 bool isRetainObjCProperty() const {
1013 return (getAttributes() & dwarf::DW_APPLE_PROPERTY_retain) != 0;
1015 bool isCopyObjCProperty() const {
1016 return (getAttributes() & dwarf::DW_APPLE_PROPERTY_copy) != 0;
1018 bool isNonAtomicObjCProperty() const {
1019 return (getAttributes() & dwarf::DW_APPLE_PROPERTY_nonatomic) != 0;
1022 /// \brief Get the type.
1024 /// \note Objective-C doesn't have an ODR, so there is no benefit in storing
1025 /// the type as a DITypeRef here.
1026 DIType getType() const { return getFieldAs<DIType>(2); }
1028 bool Verify() const;
1031 /// \brief An imported module (C++ using directive or similar).
1032 class DIImportedEntity : public DIDescriptor {
1033 friend class DIDescriptor;
1034 void printInternal(raw_ostream &OS) const;
1037 explicit DIImportedEntity(const MDNode *N) : DIDescriptor(N) {}
1038 DIScope getContext() const { return getFieldAs<DIScope>(1); }
1039 DIScopeRef getEntity() const { return getFieldAs<DIScopeRef>(2); }
1040 unsigned getLineNumber() const { return getHeaderFieldAs<unsigned>(1); }
1041 StringRef getName() const { return getHeaderField(2); }
1042 bool Verify() const;
1045 /// \brief Find subprogram that is enclosing this scope.
1046 DISubprogram getDISubprogram(const MDNode *Scope);
1048 /// \brief Find debug info for a given function.
1049 /// \returns a valid DISubprogram, if found. Otherwise, it returns an empty
1051 DISubprogram getDISubprogram(const Function *F);
1053 /// \brief Find underlying composite type.
1054 DICompositeType getDICompositeType(DIType T);
1056 /// \brief Create a new inlined variable based on current variable.
1058 /// @param DV Current Variable.
1059 /// @param InlinedScope Location at current variable is inlined.
1060 DIVariable createInlinedVariable(MDNode *DV, MDNode *InlinedScope,
1061 LLVMContext &VMContext);
1063 /// \brief Remove inlined scope from the variable.
1064 DIVariable cleanseInlinedVariable(MDNode *DV, LLVMContext &VMContext);
1066 /// \brief Generate map by visiting all retained types.
1067 DITypeIdentifierMap generateDITypeIdentifierMap(const NamedMDNode *CU_Nodes);
1069 /// \brief Strip debug info in the module if it exists.
1071 /// To do this, we remove all calls to the debugger intrinsics and any named
1072 /// metadata for debugging. We also remove debug locations for instructions.
1073 /// Return true if module is modified.
1074 bool StripDebugInfo(Module &M);
1076 /// \brief Return Debug Info Metadata Version by checking module flags.
1077 unsigned getDebugMetadataVersionFromModule(const Module &M);
1079 /// \brief Utility to find all debug info in a module.
1081 /// DebugInfoFinder tries to list all debug info MDNodes used in a module. To
1082 /// list debug info MDNodes used by an instruction, DebugInfoFinder uses
1083 /// processDeclare, processValue and processLocation to handle DbgDeclareInst,
1084 /// DbgValueInst and DbgLoc attached to instructions. processModule will go
1085 /// through all DICompileUnits in llvm.dbg.cu and list debug info MDNodes
1086 /// used by the CUs.
1087 class DebugInfoFinder {
1089 DebugInfoFinder() : TypeMapInitialized(false) {}
1091 /// \brief Process entire module and collect debug info anchors.
1092 void processModule(const Module &M);
1094 /// \brief Process DbgDeclareInst.
1095 void processDeclare(const Module &M, const DbgDeclareInst *DDI);
1096 /// \brief Process DbgValueInst.
1097 void processValue(const Module &M, const DbgValueInst *DVI);
1098 /// \brief Process DILocation.
1099 void processLocation(const Module &M, DILocation Loc);
1101 /// \brief Process DIExpression.
1102 void processExpression(DIExpression Expr);
1104 /// \brief Clear all lists.
1108 void InitializeTypeMap(const Module &M);
1110 void processType(DIType DT);
1111 void processSubprogram(DISubprogram SP);
1112 void processScope(DIScope Scope);
1113 bool addCompileUnit(DICompileUnit CU);
1114 bool addGlobalVariable(DIGlobalVariable DIG);
1115 bool addSubprogram(DISubprogram SP);
1116 bool addType(DIType DT);
1117 bool addScope(DIScope Scope);
1120 typedef SmallVectorImpl<DICompileUnit>::const_iterator compile_unit_iterator;
1121 typedef SmallVectorImpl<DISubprogram>::const_iterator subprogram_iterator;
1122 typedef SmallVectorImpl<DIGlobalVariable>::const_iterator global_variable_iterator;
1123 typedef SmallVectorImpl<DIType>::const_iterator type_iterator;
1124 typedef SmallVectorImpl<DIScope>::const_iterator scope_iterator;
1126 iterator_range<compile_unit_iterator> compile_units() const {
1127 return iterator_range<compile_unit_iterator>(CUs.begin(), CUs.end());
1130 iterator_range<subprogram_iterator> subprograms() const {
1131 return iterator_range<subprogram_iterator>(SPs.begin(), SPs.end());
1134 iterator_range<global_variable_iterator> global_variables() const {
1135 return iterator_range<global_variable_iterator>(GVs.begin(), GVs.end());
1138 iterator_range<type_iterator> types() const {
1139 return iterator_range<type_iterator>(TYs.begin(), TYs.end());
1142 iterator_range<scope_iterator> scopes() const {
1143 return iterator_range<scope_iterator>(Scopes.begin(), Scopes.end());
1146 unsigned compile_unit_count() const { return CUs.size(); }
1147 unsigned global_variable_count() const { return GVs.size(); }
1148 unsigned subprogram_count() const { return SPs.size(); }
1149 unsigned type_count() const { return TYs.size(); }
1150 unsigned scope_count() const { return Scopes.size(); }
1153 SmallVector<DICompileUnit, 8> CUs;
1154 SmallVector<DISubprogram, 8> SPs;
1155 SmallVector<DIGlobalVariable, 8> GVs;
1156 SmallVector<DIType, 8> TYs;
1157 SmallVector<DIScope, 8> Scopes;
1158 SmallPtrSet<MDNode *, 64> NodesSeen;
1159 DITypeIdentifierMap TypeIdentifierMap;
1161 /// \brief Specify if TypeIdentifierMap is initialized.
1162 bool TypeMapInitialized;
1165 DenseMap<const Function *, DISubprogram> makeSubprogramMap(const Module &M);
1167 } // end namespace llvm