1 //===- DebugInfo.h - Debug Information Helpers ------------------*- C++ -*-===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
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
13 // DWARF information.
14 //
15 //===----------------------------------------------------------------------===//
16
17 #ifndef LLVM_IR_DEBUGINFO_H
18 #define LLVM_IR_DEBUGINFO_H
19
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"
29 #include <iterator>
30
31 namespace llvm {
32 class BasicBlock;
33 class Constant;
34 class Function;
35 class GlobalVariable;
36 class Module;
37 class Type;
38 class Value;
39 class DbgDeclareInst;
40 class DbgValueInst;
41 class Instruction;
42 class Metadata;
43 class MDNode;
44 class MDString;
45 class NamedMDNode;
46 class LLVMContext;
47 class raw_ostream;
48
49 class DIFile;
50 class DISubprogram;
51 class DILexicalBlock;
52 class DILexicalBlockFile;
53 class DIVariable;
54 class DIType;
55 class DIScope;
56 class DIObjCProperty;
57
58 /// \brief Maps from type identifier to the actual MDNode.
59 typedef DenseMap<const MDString *, MDNode *> DITypeIdentifierMap;
60
61 class DIHeaderFieldIterator
62 : public std::iterator<std::input_iterator_tag, StringRef, std::ptrdiff_t,
63 const StringRef *, StringRef> {
64 StringRef Header;
65 StringRef Current;
66
67 public:
DIHeaderFieldIterator()68 DIHeaderFieldIterator() {}
DIHeaderFieldIterator(StringRef Header)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++() {
74 increment();
75 return *this;
76 }
77 DIHeaderFieldIterator operator++(int) {
78 DIHeaderFieldIterator X(*this);
79 increment();
80 return X;
81 }
82 bool operator==(const DIHeaderFieldIterator &X) const {
83 return Current.data() == X.Current.data();
84 }
85 bool operator!=(const DIHeaderFieldIterator &X) const {
86 return !(*this == X);
87 }
88
getHeader()89 StringRef getHeader() const { return Header; }
getCurrent()90 StringRef getCurrent() const { return Current; }
getPrefix()91 StringRef getPrefix() const {
92 if (Current.begin() == Header.begin())
93 return StringRef();
94 return Header.slice(0, Current.begin() - Header.begin() - 1);
95 }
getSuffix()96 StringRef getSuffix() const {
97 if (Current.end() == Header.end())
98 return StringRef();
99 return Header.slice(Current.end() - Header.begin() + 1, StringRef::npos);
100 }
101
102 private:
increment()103 void increment() {
104 assert(Current.data() != nullptr && "Cannot increment past the end");
105 StringRef Suffix = getSuffix();
106 Current = Suffix.slice(0, Suffix.find('\0'));
107 }
108 };
109
110 /// \brief A thin wraper around MDNode to access encoded debug info.
111 ///
112 /// This should not be stored in a container, because the underlying MDNode may
113 /// change in certain situations.
114 class DIDescriptor {
115 // Befriends DIRef so DIRef can befriend the protected member
116 // function: getFieldAs<DIRef>.
117 template <typename T> friend class DIRef;
118
119 public:
120 /// \brief Accessibility flags.
121 ///
122 /// The three accessibility flags are mutually exclusive and rolled together
123 /// in the first two bits.
124 enum {
125 FlagAccessibility = 1 << 0 | 1 << 1,
126 FlagPrivate = 1,
127 FlagProtected = 2,
128 FlagPublic = 3,
129
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 FlagIndirectVariable = 1 << 13,
142 FlagLValueReference = 1 << 14,
143 FlagRValueReference = 1 << 15
144 };
145
146 protected:
147 const MDNode *DbgNode;
148
149 StringRef getStringField(unsigned Elt) const;
getUnsignedField(unsigned Elt)150 unsigned getUnsignedField(unsigned Elt) const {
151 return (unsigned)getUInt64Field(Elt);
152 }
153 uint64_t getUInt64Field(unsigned Elt) const;
154 int64_t getInt64Field(unsigned Elt) const;
155 DIDescriptor getDescriptorField(unsigned Elt) const;
156
getFieldAs(unsigned Elt)157 template <typename DescTy> DescTy getFieldAs(unsigned Elt) const {
158 return DescTy(getDescriptorField(Elt));
159 }
160
161 GlobalVariable *getGlobalVariableField(unsigned Elt) const;
162 Constant *getConstantField(unsigned Elt) const;
163 Function *getFunctionField(unsigned Elt) const;
164 void replaceFunctionField(unsigned Elt, Function *F);
165
166 public:
DbgNode(N)167 explicit DIDescriptor(const MDNode *N = nullptr) : DbgNode(N) {}
168
169 bool Verify() const;
170
get()171 MDNode *get() const { return const_cast<MDNode *>(DbgNode); }
172 operator MDNode *() const { return get(); }
173 MDNode *operator->() const { return get(); }
174
175 // An explicit operator bool so that we can do testing of DI values
176 // easily.
177 // FIXME: This operator bool isn't actually protecting anything at the
178 // moment due to the conversion operator above making DIDescriptor nodes
179 // implicitly convertable to bool.
180 LLVM_EXPLICIT operator bool() const { return DbgNode != nullptr; }
181
182 bool operator==(DIDescriptor Other) const { return DbgNode == Other.DbgNode; }
183 bool operator!=(DIDescriptor Other) const { return !operator==(Other); }
184
getHeader()185 StringRef getHeader() const {
186 return getStringField(0);
187 }
188
getNumHeaderFields()189 size_t getNumHeaderFields() const {
190 return std::distance(DIHeaderFieldIterator(getHeader()),
191 DIHeaderFieldIterator());
192 }
193
getHeaderField(unsigned Index)194 StringRef getHeaderField(unsigned Index) const {
195 // Since callers expect an empty string for out-of-range accesses, we can't
196 // use std::advance() here.
197 for (DIHeaderFieldIterator I(getHeader()), E; I != E; ++I, --Index)
198 if (!Index)
199 return *I;
200 return StringRef();
201 }
202
getHeaderFieldAs(unsigned Index)203 template <class T> T getHeaderFieldAs(unsigned Index) const {
204 T Int;
205 if (getHeaderField(Index).getAsInteger(0, Int))
206 return 0;
207 return Int;
208 }
209
getTag()210 uint16_t getTag() const { return getHeaderFieldAs<uint16_t>(0); }
211
212 bool isDerivedType() const;
213 bool isCompositeType() const;
214 bool isSubroutineType() const;
215 bool isBasicType() const;
216 bool isVariable() const;
217 bool isSubprogram() const;
218 bool isGlobalVariable() const;
219 bool isScope() const;
220 bool isFile() const;
221 bool isCompileUnit() const;
222 bool isNameSpace() const;
223 bool isLexicalBlockFile() const;
224 bool isLexicalBlock() const;
225 bool isSubrange() const;
226 bool isEnumerator() const;
227 bool isType() const;
228 bool isTemplateTypeParameter() const;
229 bool isTemplateValueParameter() const;
230 bool isObjCProperty() const;
231 bool isImportedEntity() const;
232 bool isExpression() const;
233
234 void print(raw_ostream &OS) const;
235 void dump() const;
236
237 /// \brief Replace all uses of debug info referenced by this descriptor.
238 void replaceAllUsesWith(LLVMContext &VMContext, DIDescriptor D);
239 void replaceAllUsesWith(MDNode *D);
240 };
241
242 /// \brief This is used to represent ranges, for array bounds.
243 class DISubrange : public DIDescriptor {
244 friend class DIDescriptor;
245 void printInternal(raw_ostream &OS) const;
246
247 public:
DIDescriptor(N)248 explicit DISubrange(const MDNode *N = nullptr) : DIDescriptor(N) {}
249
getLo()250 int64_t getLo() const { return getHeaderFieldAs<int64_t>(1); }
getCount()251 int64_t getCount() const { return getHeaderFieldAs<int64_t>(2); }
252 bool Verify() const;
253 };
254
255 /// \brief This descriptor holds an array of nodes with type T.
256 template <typename T> class DITypedArray : public DIDescriptor {
257 public:
DIDescriptor(N)258 explicit DITypedArray(const MDNode *N = nullptr) : DIDescriptor(N) {}
getNumElements()259 unsigned getNumElements() const {
260 return DbgNode ? DbgNode->getNumOperands() : 0;
261 }
getElement(unsigned Idx)262 T getElement(unsigned Idx) const {
263 return getFieldAs<T>(Idx);
264 }
265 };
266
267 typedef DITypedArray<DIDescriptor> DIArray;
268
269 /// \brief A wrapper for an enumerator (e.g. X and Y in 'enum {X,Y}').
270 ///
271 /// FIXME: it seems strange that this doesn't have either a reference to the
272 /// type/precision or a file/line pair for location info.
273 class DIEnumerator : public DIDescriptor {
274 friend class DIDescriptor;
275 void printInternal(raw_ostream &OS) const;
276
277 public:
DIDescriptor(N)278 explicit DIEnumerator(const MDNode *N = nullptr) : DIDescriptor(N) {}
279
getName()280 StringRef getName() const { return getHeaderField(1); }
getEnumValue()281 int64_t getEnumValue() const { return getHeaderFieldAs<int64_t>(2); }
282 bool Verify() const;
283 };
284
285 template <typename T> class DIRef;
286 typedef DIRef<DIScope> DIScopeRef;
287 typedef DIRef<DIType> DITypeRef;
288 typedef DITypedArray<DITypeRef> DITypeArray;
289
290 /// \brief A base class for various scopes.
291 ///
292 /// Although, implementation-wise, DIScope is the parent class of most
293 /// other DIxxx classes, including DIType and its descendants, most of
294 /// DIScope's descendants are not a substitutable subtype of
295 /// DIScope. The DIDescriptor::isScope() method only is true for
296 /// DIScopes that are scopes in the strict lexical scope sense
297 /// (DICompileUnit, DISubprogram, etc.), but not for, e.g., a DIType.
298 class DIScope : public DIDescriptor {
299 protected:
300 friend class DIDescriptor;
301 void printInternal(raw_ostream &OS) const;
302
303 public:
DIDescriptor(N)304 explicit DIScope(const MDNode *N = nullptr) : DIDescriptor(N) {}
305
306 /// \brief Get the parent scope.
307 ///
308 /// Gets the parent scope for this scope node or returns a default
309 /// constructed scope.
310 DIScopeRef getContext() const;
311 /// \brief Get the scope name.
312 ///
313 /// If the scope node has a name, return that, else return an empty string.
314 StringRef getName() const;
315 StringRef getFilename() const;
316 StringRef getDirectory() const;
317
318 /// \brief Generate a reference to this DIScope.
319 ///
320 /// Uses the type identifier instead of the actual MDNode if possible, to
321 /// help type uniquing.
322 DIScopeRef getRef() const;
323 };
324
325 /// \brief Represents reference to a DIDescriptor.
326 ///
327 /// Abstracts over direct and identifier-based metadata references.
328 template <typename T> class DIRef {
329 template <typename DescTy>
330 friend DescTy DIDescriptor::getFieldAs(unsigned Elt) const;
331 friend DIScopeRef DIScope::getContext() const;
332 friend DIScopeRef DIScope::getRef() const;
333 friend class DIType;
334
335 /// \brief Val can be either a MDNode or a MDString.
336 ///
337 /// In the latter, MDString specifies the type identifier.
338 const Metadata *Val;
339 explicit DIRef(const Metadata *V);
340
341 public:
342 T resolve(const DITypeIdentifierMap &Map) const;
343 StringRef getName() const;
344 operator Metadata *() const { return const_cast<Metadata *>(Val); }
345 };
346
347 template <typename T>
resolve(const DITypeIdentifierMap & Map)348 T DIRef<T>::resolve(const DITypeIdentifierMap &Map) const {
349 if (!Val)
350 return T();
351
352 if (const MDNode *MD = dyn_cast<MDNode>(Val))
353 return T(MD);
354
355 const MDString *MS = cast<MDString>(Val);
356 // Find the corresponding MDNode.
357 DITypeIdentifierMap::const_iterator Iter = Map.find(MS);
358 assert(Iter != Map.end() && "Identifier not in the type map?");
359 assert(DIDescriptor(Iter->second).isType() &&
360 "MDNode in DITypeIdentifierMap should be a DIType.");
361 return T(Iter->second);
362 }
363
getName()364 template <typename T> StringRef DIRef<T>::getName() const {
365 if (!Val)
366 return StringRef();
367
368 if (const MDNode *MD = dyn_cast<MDNode>(Val))
369 return T(MD).getName();
370
371 const MDString *MS = cast<MDString>(Val);
372 return MS->getString();
373 }
374
375 /// \brief Handle fields that are references to DIScopes.
376 template <> DIScopeRef DIDescriptor::getFieldAs<DIScopeRef>(unsigned Elt) const;
377 /// \brief Specialize DIRef constructor for DIScopeRef.
378 template <> DIRef<DIScope>::DIRef(const Metadata *V);
379
380 /// \brief Handle fields that are references to DITypes.
381 template <> DITypeRef DIDescriptor::getFieldAs<DITypeRef>(unsigned Elt) const;
382 /// \brief Specialize DIRef constructor for DITypeRef.
383 template <> DIRef<DIType>::DIRef(const Metadata *V);
384
385 /// \briefThis is a wrapper for a type.
386 ///
387 /// FIXME: Types should be factored much better so that CV qualifiers and
388 /// others do not require a huge and empty descriptor full of zeros.
389 class DIType : public DIScope {
390 protected:
391 friend class DIDescriptor;
392 void printInternal(raw_ostream &OS) const;
393
394 public:
DIScope(N)395 explicit DIType(const MDNode *N = nullptr) : DIScope(N) {}
DITypeRef()396 operator DITypeRef () const {
397 assert(isType() &&
398 "constructing DITypeRef from an MDNode that is not a type");
399 return DITypeRef(&*getRef());
400 }
401
402 bool Verify() const;
403
getContext()404 DIScopeRef getContext() const { return getFieldAs<DIScopeRef>(2); }
getName()405 StringRef getName() const { return getHeaderField(1); }
getLineNumber()406 unsigned getLineNumber() const {
407 return getHeaderFieldAs<unsigned>(2);
408 }
getSizeInBits()409 uint64_t getSizeInBits() const {
410 return getHeaderFieldAs<unsigned>(3);
411 }
getAlignInBits()412 uint64_t getAlignInBits() const {
413 return getHeaderFieldAs<unsigned>(4);
414 }
415 // FIXME: Offset is only used for DW_TAG_member nodes. Making every type
416 // carry this is just plain insane.
getOffsetInBits()417 uint64_t getOffsetInBits() const {
418 return getHeaderFieldAs<unsigned>(5);
419 }
getFlags()420 unsigned getFlags() const { return getHeaderFieldAs<unsigned>(6); }
isPrivate()421 bool isPrivate() const {
422 return (getFlags() & FlagAccessibility) == FlagPrivate;
423 }
isProtected()424 bool isProtected() const {
425 return (getFlags() & FlagAccessibility) == FlagProtected;
426 }
isPublic()427 bool isPublic() const {
428 return (getFlags() & FlagAccessibility) == FlagPublic;
429 }
isForwardDecl()430 bool isForwardDecl() const { return (getFlags() & FlagFwdDecl) != 0; }
isAppleBlockExtension()431 bool isAppleBlockExtension() const {
432 return (getFlags() & FlagAppleBlock) != 0;
433 }
isBlockByrefStruct()434 bool isBlockByrefStruct() const {
435 return (getFlags() & FlagBlockByrefStruct) != 0;
436 }
isVirtual()437 bool isVirtual() const { return (getFlags() & FlagVirtual) != 0; }
isArtificial()438 bool isArtificial() const { return (getFlags() & FlagArtificial) != 0; }
isObjectPointer()439 bool isObjectPointer() const { return (getFlags() & FlagObjectPointer) != 0; }
isObjcClassComplete()440 bool isObjcClassComplete() const {
441 return (getFlags() & FlagObjcClassComplete) != 0;
442 }
isVector()443 bool isVector() const { return (getFlags() & FlagVector) != 0; }
isStaticMember()444 bool isStaticMember() const { return (getFlags() & FlagStaticMember) != 0; }
isLValueReference()445 bool isLValueReference() const {
446 return (getFlags() & FlagLValueReference) != 0;
447 }
isRValueReference()448 bool isRValueReference() const {
449 return (getFlags() & FlagRValueReference) != 0;
450 }
isValid()451 bool isValid() const { return DbgNode && isType(); }
452 };
453
454 /// \brief A basic type, like 'int' or 'float'.
455 class DIBasicType : public DIType {
456 public:
DIType(N)457 explicit DIBasicType(const MDNode *N = nullptr) : DIType(N) {}
458
getEncoding()459 unsigned getEncoding() const { return getHeaderFieldAs<unsigned>(7); }
460
461 bool Verify() const;
462 };
463
464 /// \brief A simple derived type
465 ///
466 /// Like a const qualified type, a typedef, a pointer or reference, et cetera.
467 /// Or, a data member of a class/struct/union.
468 class DIDerivedType : public DIType {
469 friend class DIDescriptor;
470 void printInternal(raw_ostream &OS) const;
471
472 public:
DIType(N)473 explicit DIDerivedType(const MDNode *N = nullptr) : DIType(N) {}
474
getTypeDerivedFrom()475 DITypeRef getTypeDerivedFrom() const { return getFieldAs<DITypeRef>(3); }
476
477 /// \brief Return property node, if this ivar is associated with one.
478 MDNode *getObjCProperty() const;
479
getClassType()480 DITypeRef getClassType() const {
481 assert(getTag() == dwarf::DW_TAG_ptr_to_member_type);
482 return getFieldAs<DITypeRef>(4);
483 }
484
getConstant()485 Constant *getConstant() const {
486 assert((getTag() == dwarf::DW_TAG_member) && isStaticMember());
487 return getConstantField(4);
488 }
489
490 bool Verify() const;
491 };
492
493 /// \brief Types that refer to multiple other types.
494 ///
495 /// This descriptor holds a type that can refer to multiple other types, like a
496 /// function or struct.
497 ///
498 /// DICompositeType is derived from DIDerivedType because some
499 /// composite types (such as enums) can be derived from basic types
500 // FIXME: Make this derive from DIType directly & just store the
501 // base type in a single DIType field.
502 class DICompositeType : public DIDerivedType {
503 friend class DIBuilder;
504 friend class DIDescriptor;
505 void printInternal(raw_ostream &OS) const;
506
507 /// \brief Set the array of member DITypes.
508 void setArraysHelper(MDNode *Elements, MDNode *TParams);
509
510 public:
DIDerivedType(N)511 explicit DICompositeType(const MDNode *N = nullptr) : DIDerivedType(N) {}
512
getElements()513 DIArray getElements() const {
514 assert(!isSubroutineType() && "no elements for DISubroutineType");
515 return getFieldAs<DIArray>(4);
516 }
517
518 private:
519 template <typename T>
520 void setArrays(DITypedArray<T> Elements, DIArray TParams = DIArray()) {
521 assert((!TParams || DbgNode->getNumOperands() == 8) &&
522 "If you're setting the template parameters this should include a slot "
523 "for that!");
524 setArraysHelper(Elements, TParams);
525 }
526
527 public:
getRunTimeLang()528 unsigned getRunTimeLang() const {
529 return getHeaderFieldAs<unsigned>(7);
530 }
getContainingType()531 DITypeRef getContainingType() const { return getFieldAs<DITypeRef>(5); }
532
533 private:
534 /// \brief Set the containing type.
535 void setContainingType(DICompositeType ContainingType);
536
537 public:
getTemplateParams()538 DIArray getTemplateParams() const { return getFieldAs<DIArray>(6); }
539 MDString *getIdentifier() const;
540
541 bool Verify() const;
542 };
543
544 class DISubroutineType : public DICompositeType {
545 public:
DICompositeType(N)546 explicit DISubroutineType(const MDNode *N = nullptr) : DICompositeType(N) {}
getTypeArray()547 DITypedArray<DITypeRef> getTypeArray() const {
548 return getFieldAs<DITypedArray<DITypeRef>>(4);
549 }
550 };
551
552 /// \brief This is a wrapper for a file.
553 class DIFile : public DIScope {
554 friend class DIDescriptor;
555
556 public:
DIScope(N)557 explicit DIFile(const MDNode *N = nullptr) : DIScope(N) {}
558
559 /// \brief Retrieve the MDNode for the directory/file pair.
560 MDNode *getFileNode() const;
561 bool Verify() const;
562 };
563
564 /// \brief A wrapper for a compile unit.
565 class DICompileUnit : public DIScope {
566 friend class DIDescriptor;
567 void printInternal(raw_ostream &OS) const;
568
569 public:
DIScope(N)570 explicit DICompileUnit(const MDNode *N = nullptr) : DIScope(N) {}
571
getLanguage()572 dwarf::SourceLanguage getLanguage() const {
573 return static_cast<dwarf::SourceLanguage>(getHeaderFieldAs<unsigned>(1));
574 }
getProducer()575 StringRef getProducer() const { return getHeaderField(2); }
576
isOptimized()577 bool isOptimized() const { return getHeaderFieldAs<bool>(3) != 0; }
getFlags()578 StringRef getFlags() const { return getHeaderField(4); }
getRunTimeVersion()579 unsigned getRunTimeVersion() const { return getHeaderFieldAs<unsigned>(5); }
580
581 DIArray getEnumTypes() const;
582 DIArray getRetainedTypes() const;
583 DIArray getSubprograms() const;
584 DIArray getGlobalVariables() const;
585 DIArray getImportedEntities() const;
586
587 void replaceSubprograms(DIArray Subprograms);
588 void replaceGlobalVariables(DIArray GlobalVariables);
589
getSplitDebugFilename()590 StringRef getSplitDebugFilename() const { return getHeaderField(6); }
getEmissionKind()591 unsigned getEmissionKind() const { return getHeaderFieldAs<unsigned>(7); }
592
593 bool Verify() const;
594 };
595
596 /// \brief This is a wrapper for a subprogram (e.g. a function).
597 class DISubprogram : public DIScope {
598 friend class DIDescriptor;
599 void printInternal(raw_ostream &OS) const;
600
601 public:
DIScope(N)602 explicit DISubprogram(const MDNode *N = nullptr) : DIScope(N) {}
603
getName()604 StringRef getName() const { return getHeaderField(1); }
getDisplayName()605 StringRef getDisplayName() const { return getHeaderField(2); }
getLinkageName()606 StringRef getLinkageName() const { return getHeaderField(3); }
getLineNumber()607 unsigned getLineNumber() const { return getHeaderFieldAs<unsigned>(4); }
608
609 /// \brief Check if this is local (like 'static' in C).
isLocalToUnit()610 unsigned isLocalToUnit() const { return getHeaderFieldAs<unsigned>(5); }
isDefinition()611 unsigned isDefinition() const { return getHeaderFieldAs<unsigned>(6); }
612
getVirtuality()613 unsigned getVirtuality() const { return getHeaderFieldAs<unsigned>(7); }
getVirtualIndex()614 unsigned getVirtualIndex() const { return getHeaderFieldAs<unsigned>(8); }
615
getFlags()616 unsigned getFlags() const { return getHeaderFieldAs<unsigned>(9); }
617
isOptimized()618 unsigned isOptimized() const { return getHeaderFieldAs<bool>(10); }
619
620 /// \brief Get the beginning of the scope of the function (not the name).
getScopeLineNumber()621 unsigned getScopeLineNumber() const { return getHeaderFieldAs<unsigned>(11); }
622
getContext()623 DIScopeRef getContext() const { return getFieldAs<DIScopeRef>(2); }
getType()624 DISubroutineType getType() const { return getFieldAs<DISubroutineType>(3); }
625
getContainingType()626 DITypeRef getContainingType() const { return getFieldAs<DITypeRef>(4); }
627
628 bool Verify() const;
629
630 /// \brief Check if this provides debugging information for the function F.
631 bool describes(const Function *F);
632
getFunction()633 Function *getFunction() const { return getFunctionField(5); }
replaceFunction(Function * F)634 void replaceFunction(Function *F) { replaceFunctionField(5, F); }
getTemplateParams()635 DIArray getTemplateParams() const { return getFieldAs<DIArray>(6); }
getFunctionDeclaration()636 DISubprogram getFunctionDeclaration() const {
637 return getFieldAs<DISubprogram>(7);
638 }
639 MDNode *getVariablesNodes() const;
640 DIArray getVariables() const;
641
isArtificial()642 unsigned isArtificial() const { return (getFlags() & FlagArtificial) != 0; }
643 /// \brief Check for the "private" access specifier.
isPrivate()644 bool isPrivate() const {
645 return (getFlags() & FlagAccessibility) == FlagPrivate;
646 }
647 /// \brief Check for the "protected" access specifier.
isProtected()648 bool isProtected() const {
649 return (getFlags() & FlagAccessibility) == FlagProtected;
650 }
651 /// \brief Check for the "public" access specifier.
isPublic()652 bool isPublic() const {
653 return (getFlags() & FlagAccessibility) == FlagPublic;
654 }
655 /// \brief Check for "explicit".
isExplicit()656 bool isExplicit() const { return (getFlags() & FlagExplicit) != 0; }
657 /// \brief Check if this is prototyped.
isPrototyped()658 bool isPrototyped() const { return (getFlags() & FlagPrototyped) != 0; }
659
660 /// \brief Check if this is reference-qualified.
661 ///
662 /// Return true if this subprogram is a C++11 reference-qualified non-static
663 /// member function (void foo() &).
isLValueReference()664 unsigned isLValueReference() const {
665 return (getFlags() & FlagLValueReference) != 0;
666 }
667
668 /// \brief Check if this is rvalue-reference-qualified.
669 ///
670 /// Return true if this subprogram is a C++11 rvalue-reference-qualified
671 /// non-static member function (void foo() &&).
isRValueReference()672 unsigned isRValueReference() const {
673 return (getFlags() & FlagRValueReference) != 0;
674 }
675
676 };
677
678 /// \brief This is a wrapper for a lexical block.
679 class DILexicalBlock : public DIScope {
680 public:
DIScope(N)681 explicit DILexicalBlock(const MDNode *N = nullptr) : DIScope(N) {}
getContext()682 DIScope getContext() const { return getFieldAs<DIScope>(2); }
getLineNumber()683 unsigned getLineNumber() const {
684 return getHeaderFieldAs<unsigned>(1);
685 }
getColumnNumber()686 unsigned getColumnNumber() const {
687 return getHeaderFieldAs<unsigned>(2);
688 }
689 bool Verify() const;
690 };
691
692 /// \brief This is a wrapper for a lexical block with a filename change.
693 class DILexicalBlockFile : public DIScope {
694 public:
DIScope(N)695 explicit DILexicalBlockFile(const MDNode *N = nullptr) : DIScope(N) {}
getContext()696 DIScope getContext() const {
697 if (getScope().isSubprogram())
698 return getScope();
699 return getScope().getContext();
700 }
getLineNumber()701 unsigned getLineNumber() const { return getScope().getLineNumber(); }
getColumnNumber()702 unsigned getColumnNumber() const { return getScope().getColumnNumber(); }
getScope()703 DILexicalBlock getScope() const { return getFieldAs<DILexicalBlock>(2); }
getDiscriminator()704 unsigned getDiscriminator() const { return getHeaderFieldAs<unsigned>(1); }
705 bool Verify() const;
706 };
707
708 /// \brief A wrapper for a C++ style name space.
709 class DINameSpace : public DIScope {
710 friend class DIDescriptor;
711 void printInternal(raw_ostream &OS) const;
712
713 public:
DIScope(N)714 explicit DINameSpace(const MDNode *N = nullptr) : DIScope(N) {}
getName()715 StringRef getName() const { return getHeaderField(1); }
getLineNumber()716 unsigned getLineNumber() const { return getHeaderFieldAs<unsigned>(2); }
getContext()717 DIScope getContext() const { return getFieldAs<DIScope>(2); }
718 bool Verify() const;
719 };
720
721 /// \brief This is a wrapper for template type parameter.
722 class DITemplateTypeParameter : public DIDescriptor {
723 public:
724 explicit DITemplateTypeParameter(const MDNode *N = nullptr)
DIDescriptor(N)725 : DIDescriptor(N) {}
726
getName()727 StringRef getName() const { return getHeaderField(1); }
getLineNumber()728 unsigned getLineNumber() const { return getHeaderFieldAs<unsigned>(2); }
getColumnNumber()729 unsigned getColumnNumber() const { return getHeaderFieldAs<unsigned>(3); }
730
getContext()731 DIScopeRef getContext() const { return getFieldAs<DIScopeRef>(1); }
getType()732 DITypeRef getType() const { return getFieldAs<DITypeRef>(2); }
getFilename()733 StringRef getFilename() const { return getFieldAs<DIFile>(3).getFilename(); }
getDirectory()734 StringRef getDirectory() const {
735 return getFieldAs<DIFile>(3).getDirectory();
736 }
737 bool Verify() const;
738 };
739
740 /// \brief This is a wrapper for template value parameter.
741 class DITemplateValueParameter : public DIDescriptor {
742 public:
743 explicit DITemplateValueParameter(const MDNode *N = nullptr)
DIDescriptor(N)744 : DIDescriptor(N) {}
745
getName()746 StringRef getName() const { return getHeaderField(1); }
getLineNumber()747 unsigned getLineNumber() const { return getHeaderFieldAs<unsigned>(2); }
getColumnNumber()748 unsigned getColumnNumber() const { return getHeaderFieldAs<unsigned>(3); }
749
getContext()750 DIScopeRef getContext() const { return getFieldAs<DIScopeRef>(1); }
getType()751 DITypeRef getType() const { return getFieldAs<DITypeRef>(2); }
752 Metadata *getValue() const;
getFilename()753 StringRef getFilename() const { return getFieldAs<DIFile>(4).getFilename(); }
getDirectory()754 StringRef getDirectory() const {
755 return getFieldAs<DIFile>(4).getDirectory();
756 }
757 bool Verify() const;
758 };
759
760 /// \brief This is a wrapper for a global variable.
761 class DIGlobalVariable : public DIDescriptor {
762 friend class DIDescriptor;
763 void printInternal(raw_ostream &OS) const;
764
765 public:
DIDescriptor(N)766 explicit DIGlobalVariable(const MDNode *N = nullptr) : DIDescriptor(N) {}
767
getName()768 StringRef getName() const { return getHeaderField(1); }
getDisplayName()769 StringRef getDisplayName() const { return getHeaderField(2); }
getLinkageName()770 StringRef getLinkageName() const { return getHeaderField(3); }
getLineNumber()771 unsigned getLineNumber() const { return getHeaderFieldAs<unsigned>(4); }
isLocalToUnit()772 unsigned isLocalToUnit() const { return getHeaderFieldAs<bool>(5); }
isDefinition()773 unsigned isDefinition() const { return getHeaderFieldAs<bool>(6); }
774
getContext()775 DIScope getContext() const { return getFieldAs<DIScope>(1); }
getFilename()776 StringRef getFilename() const { return getFieldAs<DIFile>(2).getFilename(); }
getDirectory()777 StringRef getDirectory() const {
778 return getFieldAs<DIFile>(2).getDirectory();
779 }
getType()780 DITypeRef getType() const { return getFieldAs<DITypeRef>(3); }
781
getGlobal()782 GlobalVariable *getGlobal() const { return getGlobalVariableField(4); }
getConstant()783 Constant *getConstant() const { return getConstantField(4); }
getStaticDataMemberDeclaration()784 DIDerivedType getStaticDataMemberDeclaration() const {
785 return getFieldAs<DIDerivedType>(5);
786 }
787
788 bool Verify() const;
789 };
790
791 /// \brief This is a wrapper for a variable (e.g. parameter, local, global etc).
792 class DIVariable : public DIDescriptor {
793 friend class DIDescriptor;
794 void printInternal(raw_ostream &OS) const;
795
796 public:
DIDescriptor(N)797 explicit DIVariable(const MDNode *N = nullptr) : DIDescriptor(N) {}
798
getName()799 StringRef getName() const { return getHeaderField(1); }
getLineNumber()800 unsigned getLineNumber() const {
801 // FIXME: Line number and arg number shouldn't be merged together like this.
802 return (getHeaderFieldAs<unsigned>(2) << 8) >> 8;
803 }
getArgNumber()804 unsigned getArgNumber() const { return getHeaderFieldAs<unsigned>(2) >> 24; }
805
getContext()806 DIScope getContext() const { return getFieldAs<DIScope>(1); }
getFile()807 DIFile getFile() const { return getFieldAs<DIFile>(2); }
getType()808 DITypeRef getType() const { return getFieldAs<DITypeRef>(3); }
809
810 /// \brief Return true if this variable is marked as "artificial".
isArtificial()811 bool isArtificial() const {
812 return (getHeaderFieldAs<unsigned>(3) & FlagArtificial) != 0;
813 }
814
isObjectPointer()815 bool isObjectPointer() const {
816 return (getHeaderFieldAs<unsigned>(3) & FlagObjectPointer) != 0;
817 }
818
819 /// \brief Return true if this variable is represented as a pointer.
isIndirect()820 bool isIndirect() const {
821 return (getHeaderFieldAs<unsigned>(3) & FlagIndirectVariable) != 0;
822 }
823
824 /// \brief If this variable is inlined then return inline location.
825 MDNode *getInlinedAt() const;
826
827 bool Verify() const;
828
829 /// \brief Check if this is a "__block" variable (Apple Blocks).
isBlockByrefVariable(const DITypeIdentifierMap & Map)830 bool isBlockByrefVariable(const DITypeIdentifierMap &Map) const {
831 return (getType().resolve(Map)).isBlockByrefStruct();
832 }
833
834 /// \brief Check if this is an inlined function argument.
835 bool isInlinedFnArgument(const Function *CurFn);
836
837 /// \brief Return the size reported by the variable's type.
838 unsigned getSizeInBits(const DITypeIdentifierMap &Map);
839
840 void printExtendedName(raw_ostream &OS) const;
841 };
842
843 /// \brief A complex location expression.
844 class DIExpression : public DIDescriptor {
845 friend class DIDescriptor;
846 void printInternal(raw_ostream &OS) const;
847
848 public:
DIDescriptor(N)849 explicit DIExpression(const MDNode *N = nullptr) : DIDescriptor(N) {}
850
851 bool Verify() const;
852
853 /// \brief Return the number of elements in the complex expression.
getNumElements()854 unsigned getNumElements() const {
855 if (!DbgNode)
856 return 0;
857 unsigned N = getNumHeaderFields();
858 assert(N > 0 && "missing tag");
859 return N - 1;
860 }
861
862 /// \brief return the Idx'th complex address element.
863 uint64_t getElement(unsigned Idx) const;
864
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;
871 };
872
873 /// \brief This object holds location information.
874 ///
875 /// This object is not associated with any DWARF tag.
876 class DILocation : public DIDescriptor {
877 public:
DILocation(const MDNode * N)878 explicit DILocation(const MDNode *N) : DIDescriptor(N) {}
879
getLineNumber()880 unsigned getLineNumber() const {
881 if (auto *L = dyn_cast_or_null<MDLocation>(DbgNode))
882 return L->getLine();
883 return 0;
884 }
getColumnNumber()885 unsigned getColumnNumber() const {
886 if (auto *L = dyn_cast_or_null<MDLocation>(DbgNode))
887 return L->getColumn();
888 return 0;
889 }
getScope()890 DIScope getScope() const {
891 if (auto *L = dyn_cast_or_null<MDLocation>(DbgNode))
892 return DIScope(dyn_cast_or_null<MDNode>(L->getScope()));
893 return DIScope(nullptr);
894 }
getOrigLocation()895 DILocation getOrigLocation() const {
896 if (auto *L = dyn_cast_or_null<MDLocation>(DbgNode))
897 return DILocation(dyn_cast_or_null<MDNode>(L->getInlinedAt()));
898 return DILocation(nullptr);
899 }
getFilename()900 StringRef getFilename() const { return getScope().getFilename(); }
getDirectory()901 StringRef getDirectory() const { return getScope().getDirectory(); }
902 bool Verify() const;
atSameLineAs(const DILocation & Other)903 bool atSameLineAs(const DILocation &Other) const {
904 return (getLineNumber() == Other.getLineNumber() &&
905 getFilename() == Other.getFilename());
906 }
907 /// \brief Get the DWAF discriminator.
908 ///
909 /// DWARF discriminators are used to distinguish identical file locations for
910 /// instructions that are on different basic blocks. If two instructions are
911 /// inside the same lexical block and are in different basic blocks, we
912 /// create a new lexical block with identical location as the original but
913 /// with a different discriminator value
914 /// (lib/Transforms/Util/AddDiscriminators.cpp for details).
getDiscriminator()915 unsigned getDiscriminator() const {
916 // Since discriminators are associated with lexical blocks, make
917 // sure this location is a lexical block before retrieving its
918 // value.
919 return getScope().isLexicalBlockFile()
920 ? DILexicalBlockFile(
921 cast<MDNode>(cast<MDLocation>(DbgNode)->getScope()))
922 .getDiscriminator()
923 : 0;
924 }
925
926 /// \brief Generate a new discriminator value for this location.
927 unsigned computeNewDiscriminator(LLVMContext &Ctx);
928
929 /// \brief Return a copy of this location with a different scope.
930 DILocation copyWithNewScope(LLVMContext &Ctx, DILexicalBlockFile NewScope);
931 };
932
933 class DIObjCProperty : public DIDescriptor {
934 friend class DIDescriptor;
935 void printInternal(raw_ostream &OS) const;
936
937 public:
DIObjCProperty(const MDNode * N)938 explicit DIObjCProperty(const MDNode *N) : DIDescriptor(N) {}
939
getObjCPropertyName()940 StringRef getObjCPropertyName() const { return getHeaderField(1); }
getFile()941 DIFile getFile() const { return getFieldAs<DIFile>(1); }
getLineNumber()942 unsigned getLineNumber() const { return getHeaderFieldAs<unsigned>(2); }
943
getObjCPropertyGetterName()944 StringRef getObjCPropertyGetterName() const { return getHeaderField(3); }
getObjCPropertySetterName()945 StringRef getObjCPropertySetterName() const { return getHeaderField(4); }
getAttributes()946 unsigned getAttributes() const { return getHeaderFieldAs<unsigned>(5); }
isReadOnlyObjCProperty()947 bool isReadOnlyObjCProperty() const {
948 return (getAttributes() & dwarf::DW_APPLE_PROPERTY_readonly) != 0;
949 }
isReadWriteObjCProperty()950 bool isReadWriteObjCProperty() const {
951 return (getAttributes() & dwarf::DW_APPLE_PROPERTY_readwrite) != 0;
952 }
isAssignObjCProperty()953 bool isAssignObjCProperty() const {
954 return (getAttributes() & dwarf::DW_APPLE_PROPERTY_assign) != 0;
955 }
isRetainObjCProperty()956 bool isRetainObjCProperty() const {
957 return (getAttributes() & dwarf::DW_APPLE_PROPERTY_retain) != 0;
958 }
isCopyObjCProperty()959 bool isCopyObjCProperty() const {
960 return (getAttributes() & dwarf::DW_APPLE_PROPERTY_copy) != 0;
961 }
isNonAtomicObjCProperty()962 bool isNonAtomicObjCProperty() const {
963 return (getAttributes() & dwarf::DW_APPLE_PROPERTY_nonatomic) != 0;
964 }
965
966 /// \brief Get the type.
967 ///
968 /// \note Objective-C doesn't have an ODR, so there is no benefit in storing
969 /// the type as a DITypeRef here.
getType()970 DIType getType() const { return getFieldAs<DIType>(2); }
971
972 bool Verify() const;
973 };
974
975 /// \brief An imported module (C++ using directive or similar).
976 class DIImportedEntity : public DIDescriptor {
977 friend class DIDescriptor;
978 void printInternal(raw_ostream &OS) const;
979
980 public:
DIImportedEntity(const MDNode * N)981 explicit DIImportedEntity(const MDNode *N) : DIDescriptor(N) {}
getContext()982 DIScope getContext() const { return getFieldAs<DIScope>(1); }
getEntity()983 DIScopeRef getEntity() const { return getFieldAs<DIScopeRef>(2); }
getLineNumber()984 unsigned getLineNumber() const { return getHeaderFieldAs<unsigned>(1); }
getName()985 StringRef getName() const { return getHeaderField(2); }
986 bool Verify() const;
987 };
988
989 /// \brief Find subprogram that is enclosing this scope.
990 DISubprogram getDISubprogram(const MDNode *Scope);
991
992 /// \brief Find debug info for a given function.
993 /// \returns a valid DISubprogram, if found. Otherwise, it returns an empty
994 /// DISubprogram.
995 DISubprogram getDISubprogram(const Function *F);
996
997 /// \brief Find underlying composite type.
998 DICompositeType getDICompositeType(DIType T);
999
1000 /// \brief Create a new inlined variable based on current variable.
1001 ///
1002 /// @param DV Current Variable.
1003 /// @param InlinedScope Location at current variable is inlined.
1004 DIVariable createInlinedVariable(MDNode *DV, MDNode *InlinedScope,
1005 LLVMContext &VMContext);
1006
1007 /// \brief Remove inlined scope from the variable.
1008 DIVariable cleanseInlinedVariable(MDNode *DV, LLVMContext &VMContext);
1009
1010 /// \brief Generate map by visiting all retained types.
1011 DITypeIdentifierMap generateDITypeIdentifierMap(const NamedMDNode *CU_Nodes);
1012
1013 /// \brief Strip debug info in the module if it exists.
1014 ///
1015 /// To do this, we remove all calls to the debugger intrinsics and any named
1016 /// metadata for debugging. We also remove debug locations for instructions.
1017 /// Return true if module is modified.
1018 bool StripDebugInfo(Module &M);
1019
1020 /// \brief Return Debug Info Metadata Version by checking module flags.
1021 unsigned getDebugMetadataVersionFromModule(const Module &M);
1022
1023 /// \brief Utility to find all debug info in a module.
1024 ///
1025 /// DebugInfoFinder tries to list all debug info MDNodes used in a module. To
1026 /// list debug info MDNodes used by an instruction, DebugInfoFinder uses
1027 /// processDeclare, processValue and processLocation to handle DbgDeclareInst,
1028 /// DbgValueInst and DbgLoc attached to instructions. processModule will go
1029 /// through all DICompileUnits in llvm.dbg.cu and list debug info MDNodes
1030 /// used by the CUs.
1031 class DebugInfoFinder {
1032 public:
DebugInfoFinder()1033 DebugInfoFinder() : TypeMapInitialized(false) {}
1034
1035 /// \brief Process entire module and collect debug info anchors.
1036 void processModule(const Module &M);
1037
1038 /// \brief Process DbgDeclareInst.
1039 void processDeclare(const Module &M, const DbgDeclareInst *DDI);
1040 /// \brief Process DbgValueInst.
1041 void processValue(const Module &M, const DbgValueInst *DVI);
1042 /// \brief Process DILocation.
1043 void processLocation(const Module &M, DILocation Loc);
1044
1045 /// \brief Clear all lists.
1046 void reset();
1047
1048 private:
1049 void InitializeTypeMap(const Module &M);
1050
1051 void processType(DIType DT);
1052 void processSubprogram(DISubprogram SP);
1053 void processScope(DIScope Scope);
1054 bool addCompileUnit(DICompileUnit CU);
1055 bool addGlobalVariable(DIGlobalVariable DIG);
1056 bool addSubprogram(DISubprogram SP);
1057 bool addType(DIType DT);
1058 bool addScope(DIScope Scope);
1059
1060 public:
1061 typedef SmallVectorImpl<DICompileUnit>::const_iterator compile_unit_iterator;
1062 typedef SmallVectorImpl<DISubprogram>::const_iterator subprogram_iterator;
1063 typedef SmallVectorImpl<DIGlobalVariable>::const_iterator global_variable_iterator;
1064 typedef SmallVectorImpl<DIType>::const_iterator type_iterator;
1065 typedef SmallVectorImpl<DIScope>::const_iterator scope_iterator;
1066
compile_units()1067 iterator_range<compile_unit_iterator> compile_units() const {
1068 return iterator_range<compile_unit_iterator>(CUs.begin(), CUs.end());
1069 }
1070
subprograms()1071 iterator_range<subprogram_iterator> subprograms() const {
1072 return iterator_range<subprogram_iterator>(SPs.begin(), SPs.end());
1073 }
1074
global_variables()1075 iterator_range<global_variable_iterator> global_variables() const {
1076 return iterator_range<global_variable_iterator>(GVs.begin(), GVs.end());
1077 }
1078
types()1079 iterator_range<type_iterator> types() const {
1080 return iterator_range<type_iterator>(TYs.begin(), TYs.end());
1081 }
1082
scopes()1083 iterator_range<scope_iterator> scopes() const {
1084 return iterator_range<scope_iterator>(Scopes.begin(), Scopes.end());
1085 }
1086
compile_unit_count()1087 unsigned compile_unit_count() const { return CUs.size(); }
global_variable_count()1088 unsigned global_variable_count() const { return GVs.size(); }
subprogram_count()1089 unsigned subprogram_count() const { return SPs.size(); }
type_count()1090 unsigned type_count() const { return TYs.size(); }
scope_count()1091 unsigned scope_count() const { return Scopes.size(); }
1092
1093 private:
1094 SmallVector<DICompileUnit, 8> CUs;
1095 SmallVector<DISubprogram, 8> SPs;
1096 SmallVector<DIGlobalVariable, 8> GVs;
1097 SmallVector<DIType, 8> TYs;
1098 SmallVector<DIScope, 8> Scopes;
1099 SmallPtrSet<MDNode *, 64> NodesSeen;
1100 DITypeIdentifierMap TypeIdentifierMap;
1101
1102 /// \brief Specify if TypeIdentifierMap is initialized.
1103 bool TypeMapInitialized;
1104 };
1105
1106 DenseMap<const Function *, DISubprogram> makeSubprogramMap(const Module &M);
1107
1108 } // end namespace llvm
1109
1110 #endif
1111