summaryrefslogtreecommitdiff
path: root/include/llvm/DebugInfo.h
blob: 3e4a960ea7ba73ddabaf427dd1f63990f1507360 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
//===--- llvm/Analysis/DebugInfo.h - Debug Information Helpers --*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines a bunch of datatypes that are useful for creating and
// walking debug info in LLVM IR form. They essentially provide wrappers around
// the information in the global variables that's needed when constructing the
// DWARF information.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_DEBUGINFO_H
#define LLVM_DEBUGINFO_H

#include "llvm/Support/Casting.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/IR/Metadata.h"
#include "llvm/Support/Dwarf.h"

namespace llvm {
class BasicBlock;
class Constant;
class Function;
class GlobalVariable;
class Module;
class Type;
class Value;
class DbgDeclareInst;
class DbgValueInst;
class Instruction;
class MDNode;
class MDString;
class NamedMDNode;
class LLVMContext;
class raw_ostream;

class DIFile;
class DISubprogram;
class DILexicalBlock;
class DILexicalBlockFile;
class DIVariable;
class DIType;
class DIScope;
class DIObjCProperty;

/// Maps from type identifier to the actual MDNode.
typedef DenseMap<const MDString *, MDNode *> DITypeIdentifierMap;

/// DIDescriptor - A thin wraper around MDNode to access encoded debug info.
/// This should not be stored in a container, because the underlying MDNode
/// may change in certain situations.
class DIDescriptor {
  // Befriends DIRef so DIRef can befriend the protected member
  // function: getFieldAs<DIRef>.
  template <typename T> friend class DIRef;

public:
  enum {
    FlagPrivate = 1 << 0,
    FlagProtected = 1 << 1,
    FlagFwdDecl = 1 << 2,
    FlagAppleBlock = 1 << 3,
    FlagBlockByrefStruct = 1 << 4,
    FlagVirtual = 1 << 5,
    FlagArtificial = 1 << 6,
    FlagExplicit = 1 << 7,
    FlagPrototyped = 1 << 8,
    FlagObjcClassComplete = 1 << 9,
    FlagObjectPointer = 1 << 10,
    FlagVector = 1 << 11,
    FlagStaticMember = 1 << 12,
    FlagIndirectVariable = 1 << 13
  };

protected:
  const MDNode *DbgNode;

  StringRef getStringField(unsigned Elt) const;
  unsigned getUnsignedField(unsigned Elt) const {
    return (unsigned)getUInt64Field(Elt);
  }
  uint64_t getUInt64Field(unsigned Elt) const;
  int64_t getInt64Field(unsigned Elt) const;
  DIDescriptor getDescriptorField(unsigned Elt) const;

  template <typename DescTy> DescTy getFieldAs(unsigned Elt) const {
    return DescTy(getDescriptorField(Elt));
  }

  GlobalVariable *getGlobalVariableField(unsigned Elt) const;
  Constant *getConstantField(unsigned Elt) const;
  Function *getFunctionField(unsigned Elt) const;
  void replaceFunctionField(unsigned Elt, Function *F);

public:
  explicit DIDescriptor(const MDNode *N = 0) : DbgNode(N) {}

  bool Verify() const;

  operator MDNode *() const { return const_cast<MDNode *>(DbgNode); }
  MDNode *operator->() const { return const_cast<MDNode *>(DbgNode); }

  // An explicit operator bool so that we can do testing of DI values
  // easily.
  // FIXME: This operator bool isn't actually protecting anything at the
  // moment due to the conversion operator above making DIDescriptor nodes
  // implicitly convertable to bool.
  LLVM_EXPLICIT operator bool() const { return DbgNode != 0; }

  bool operator==(DIDescriptor Other) const { return DbgNode == Other.DbgNode; }
  bool operator!=(DIDescriptor Other) const { return !operator==(Other); }

  uint16_t getTag() const {
    return getUnsignedField(0) & ~LLVMDebugVersionMask;
  }

  bool isDerivedType() const;
  bool isCompositeType() const;
  bool isBasicType() const;
  bool isVariable() const;
  bool isSubprogram() const;
  bool isGlobalVariable() const;
  bool isScope() const;
  bool isFile() const;
  bool isCompileUnit() const;
  bool isNameSpace() const;
  bool isLexicalBlockFile() const;
  bool isLexicalBlock() const;
  bool isSubrange() const;
  bool isEnumerator() const;
  bool isType() const;
  bool isUnspecifiedParameter() const;
  bool isTemplateTypeParameter() const;
  bool isTemplateValueParameter() const;
  bool isObjCProperty() const;
  bool isImportedEntity() const;

  /// print - print descriptor.
  void print(raw_ostream &OS) const;

  /// dump - print descriptor to dbgs() with a newline.
  void dump() const;
};

/// DISubrange - This is used to represent ranges, for array bounds.
class DISubrange : public DIDescriptor {
  friend class DIDescriptor;
  void printInternal(raw_ostream &OS) const;

public:
  explicit DISubrange(const MDNode *N = 0) : DIDescriptor(N) {}

  int64_t getLo() const { return getInt64Field(1); }
  int64_t getCount() const { return getInt64Field(2); }
  bool Verify() const;
};

/// DIArray - This descriptor holds an array of descriptors.
class DIArray : public DIDescriptor {
public:
  explicit DIArray(const MDNode *N = 0) : DIDescriptor(N) {}

  unsigned getNumElements() const;
  DIDescriptor getElement(unsigned Idx) const {
    return getDescriptorField(Idx);
  }
};

/// DIEnumerator - A wrapper for an enumerator (e.g. X and Y in 'enum {X,Y}').
/// FIXME: it seems strange that this doesn't have either a reference to the
/// type/precision or a file/line pair for location info.
class DIEnumerator : public DIDescriptor {
  friend class DIDescriptor;
  void printInternal(raw_ostream &OS) const;

public:
  explicit DIEnumerator(const MDNode *N = 0) : DIDescriptor(N) {}

  StringRef getName() const { return getStringField(1); }
  int64_t getEnumValue() const { return getInt64Field(2); }
  bool Verify() const;
};

template <typename T> class DIRef;
typedef DIRef<DIScope> DIScopeRef;
typedef DIRef<DIType> DITypeRef;

/// DIScope - A base class for various scopes.
class DIScope : public DIDescriptor {
protected:
  friend class DIDescriptor;
  void printInternal(raw_ostream &OS) const;

public:
  explicit DIScope(const MDNode *N = 0) : DIDescriptor(N) {}

  /// Gets the parent scope for this scope node or returns a
  /// default constructed scope.
  DIScopeRef getContext() const;
  /// If the scope node has a name, return that, else return an empty string.
  StringRef getName() const;
  StringRef getFilename() const;
  StringRef getDirectory() const;

  /// Generate a reference to this DIScope. Uses the type identifier instead
  /// of the actual MDNode if possible, to help type uniquing.
  DIScopeRef getRef() const;
};

/// Represents reference to a DIDescriptor, abstracts over direct and
/// identifier-based metadata references.
template <typename T> class DIRef {
  template <typename DescTy>
  friend DescTy DIDescriptor::getFieldAs(unsigned Elt) const;
  friend DIScopeRef DIScope::getContext() const;
  friend DIScopeRef DIScope::getRef() const;

  /// Val can be either a MDNode or a MDString, in the latter,
  /// MDString specifies the type identifier.
  const Value *Val;
  explicit DIRef(const Value *V);

public:
  T resolve(const DITypeIdentifierMap &Map) const;
  StringRef getName() const;
  operator Value *() const { return const_cast<Value *>(Val); }
};

template <typename T>
T DIRef<T>::resolve(const DITypeIdentifierMap &Map) const {
  if (!Val)
    return T();

  if (const MDNode *MD = dyn_cast<MDNode>(Val))
    return T(MD);

  const MDString *MS = cast<MDString>(Val);
  // Find the corresponding MDNode.
  DITypeIdentifierMap::const_iterator Iter = Map.find(MS);
  assert(Iter != Map.end() && "Identifier not in the type map?");
  assert(DIDescriptor(Iter->second).isType() &&
         "MDNode in DITypeIdentifierMap should be a DIType.");
  return T(Iter->second);
}

template <typename T>
StringRef DIRef<T>::getName() const {
  if (!Val)
    return StringRef();

  if (const MDNode *MD = dyn_cast<MDNode>(Val))
    return T(MD).getName();

  const MDString *MS = cast<MDString>(Val);
  return MS->getString();
}

/// Specialize getFieldAs to handle fields that are references to DIScopes.
template <> DIScopeRef DIDescriptor::getFieldAs<DIScopeRef>(unsigned Elt) const;
/// Specialize DIRef constructor for DIScopeRef.
template <> DIRef<DIScope>::DIRef(const Value *V);

/// Specialize getFieldAs to handle fields that are references to DITypes.
template <> DITypeRef DIDescriptor::getFieldAs<DITypeRef>(unsigned Elt) const;
/// Specialize DIRef constructor for DITypeRef.
template <> DIRef<DIType>::DIRef(const Value *V);

/// DIType - This is a wrapper for a type.
/// FIXME: Types should be factored much better so that CV qualifiers and
/// others do not require a huge and empty descriptor full of zeros.
class DIType : public DIScope {
protected:
  friend class DIDescriptor;
  void printInternal(raw_ostream &OS) const;

public:
  DIType(const MDNode *N = 0) : DIScope(N) {}

  /// Verify - Verify that a type descriptor is well formed.
  bool Verify() const;

  DIScopeRef getContext() const { return getFieldAs<DIScopeRef>(2); }
  StringRef getName() const { return getStringField(3); }
  unsigned getLineNumber() const { return getUnsignedField(4); }
  uint64_t getSizeInBits() const { return getUInt64Field(5); }
  uint64_t getAlignInBits() const { return getUInt64Field(6); }
  // FIXME: Offset is only used for DW_TAG_member nodes.  Making every type
  // carry this is just plain insane.
  uint64_t getOffsetInBits() const { return getUInt64Field(7); }
  unsigned getFlags() const { return getUnsignedField(8); }
  bool isPrivate() const { return (getFlags() & FlagPrivate) != 0; }
  bool isProtected() const { return (getFlags() & FlagProtected) != 0; }
  bool isForwardDecl() const { return (getFlags() & FlagFwdDecl) != 0; }
  // isAppleBlock - Return true if this is the Apple Blocks extension.
  bool isAppleBlockExtension() const {
    return (getFlags() & FlagAppleBlock) != 0;
  }
  bool isBlockByrefStruct() const {
    return (getFlags() & FlagBlockByrefStruct) != 0;
  }
  bool isVirtual() const { return (getFlags() & FlagVirtual) != 0; }
  bool isArtificial() const { return (getFlags() & FlagArtificial) != 0; }
  bool isObjectPointer() const { return (getFlags() & FlagObjectPointer) != 0; }
  bool isObjcClassComplete() const {
    return (getFlags() & FlagObjcClassComplete) != 0;
  }
  bool isVector() const { return (getFlags() & FlagVector) != 0; }
  bool isStaticMember() const { return (getFlags() & FlagStaticMember) != 0; }
  bool isValid() const { return DbgNode && isType(); }

  /// replaceAllUsesWith - Replace all uses of debug info referenced by
  /// this descriptor.
  void replaceAllUsesWith(DIDescriptor &D);
  void replaceAllUsesWith(MDNode *D);
};

/// DIBasicType - A basic type, like 'int' or 'float'.
class DIBasicType : public DIType {
public:
  explicit DIBasicType(const MDNode *N = 0) : DIType(N) {}

  unsigned getEncoding() const { return getUnsignedField(9); }

  /// Verify - Verify that a basic type descriptor is well formed.
  bool Verify() const;
};

/// DIDerivedType - A simple derived type, like a const qualified type,
/// a typedef, a pointer or reference, et cetera.  Or, a data member of
/// a class/struct/union.
class DIDerivedType : public DIType {
  friend class DIDescriptor;
  void printInternal(raw_ostream &OS) const;

public:
  explicit DIDerivedType(const MDNode *N = 0) : DIType(N) {}

  DITypeRef getTypeDerivedFrom() const { return getFieldAs<DITypeRef>(9); }

  /// getObjCProperty - Return property node, if this ivar is
  /// associated with one.
  MDNode *getObjCProperty() const;

  DITypeRef getClassType() const {
    assert(getTag() == dwarf::DW_TAG_ptr_to_member_type);
    return getFieldAs<DITypeRef>(10);
  }

  Constant *getConstant() const {
    assert((getTag() == dwarf::DW_TAG_member) && isStaticMember());
    return getConstantField(10);
  }

  /// Verify - Verify that a derived type descriptor is well formed.
  bool Verify() const;
};

/// DICompositeType - This descriptor holds a type that can refer to multiple
/// other types, like a function or struct.
/// DICompositeType is derived from DIDerivedType because some
/// composite types (such as enums) can be derived from basic types
// FIXME: Make this derive from DIType directly & just store the
// base type in a single DIType field.
class DICompositeType : public DIDerivedType {
  friend class DIDescriptor;
  void printInternal(raw_ostream &OS) const;

public:
  explicit DICompositeType(const MDNode *N = 0) : DIDerivedType(N) {}

  DIArray getTypeArray() const { return getFieldAs<DIArray>(10); }
  void setTypeArray(DIArray Elements, DIArray TParams = DIArray());
  void addMember(DIDescriptor D);
  unsigned getRunTimeLang() const { return getUnsignedField(11); }
  DITypeRef getContainingType() const { return getFieldAs<DITypeRef>(12); }
  void setContainingType(DICompositeType ContainingType);
  DIArray getTemplateParams() const { return getFieldAs<DIArray>(13); }
  MDString *getIdentifier() const;

  /// Verify - Verify that a composite type descriptor is well formed.
  bool Verify() const;
};

/// DIFile - This is a wrapper for a file.
class DIFile : public DIScope {
  friend class DIDescriptor;

public:
  explicit DIFile(const MDNode *N = 0) : DIScope(N) {}
  MDNode *getFileNode() const;
  bool Verify() const;
};

/// DICompileUnit - A wrapper for a compile unit.
class DICompileUnit : public DIScope {
  friend class DIDescriptor;
  void printInternal(raw_ostream &OS) const;

public:
  explicit DICompileUnit(const MDNode *N = 0) : DIScope(N) {}

  unsigned getLanguage() const { return getUnsignedField(2); }
  StringRef getProducer() const { return getStringField(3); }

  bool isOptimized() const { return getUnsignedField(4) != 0; }
  StringRef getFlags() const { return getStringField(5); }
  unsigned getRunTimeVersion() const { return getUnsignedField(6); }

  DIArray getEnumTypes() const;
  DIArray getRetainedTypes() const;
  DIArray getSubprograms() const;
  DIArray getGlobalVariables() const;
  DIArray getImportedEntities() const;

  StringRef getSplitDebugFilename() const { return getStringField(12); }

  /// Verify - Verify that a compile unit is well formed.
  bool Verify() const;
};

/// DISubprogram - This is a wrapper for a subprogram (e.g. a function).
class DISubprogram : public DIScope {
  friend class DIDescriptor;
  void printInternal(raw_ostream &OS) const;

public:
  explicit DISubprogram(const MDNode *N = 0) : DIScope(N) {}

  DIScopeRef getContext() const { return getFieldAs<DIScopeRef>(2); }
  StringRef getName() const { return getStringField(3); }
  StringRef getDisplayName() const { return getStringField(4); }
  StringRef getLinkageName() const { return getStringField(5); }
  unsigned getLineNumber() const { return getUnsignedField(6); }
  DICompositeType getType() const { return getFieldAs<DICompositeType>(7); }

  /// isLocalToUnit - Return true if this subprogram is local to the current
  /// compile unit, like 'static' in C.
  unsigned isLocalToUnit() const { return getUnsignedField(8); }
  unsigned isDefinition() const { return getUnsignedField(9); }

  unsigned getVirtuality() const { return getUnsignedField(10); }
  unsigned getVirtualIndex() const { return getUnsignedField(11); }

  DITypeRef getContainingType() const { return getFieldAs<DITypeRef>(12); }

  unsigned getFlags() const { return getUnsignedField(13); }

  unsigned isArtificial() const {
    return (getUnsignedField(13) & FlagArtificial) != 0;
  }
  /// isPrivate - Return true if this subprogram has "private"
  /// access specifier.
  bool isPrivate() const { return (getUnsignedField(13) & FlagPrivate) != 0; }
  /// isProtected - Return true if this subprogram has "protected"
  /// access specifier.
  bool isProtected() const {
    return (getUnsignedField(13) & FlagProtected) != 0;
  }
  /// isExplicit - Return true if this subprogram is marked as explicit.
  bool isExplicit() const { return (getUnsignedField(13) & FlagExplicit) != 0; }
  /// isPrototyped - Return true if this subprogram is prototyped.
  bool isPrototyped() const {
    return (getUnsignedField(13) & FlagPrototyped) != 0;
  }

  unsigned isOptimized() const;

  /// Verify - Verify that a subprogram descriptor is well formed.
  bool Verify() const;

  /// describes - Return true if this subprogram provides debugging
  /// information for the function F.
  bool describes(const Function *F);

  Function *getFunction() const { return getFunctionField(15); }
  void replaceFunction(Function *F) { replaceFunctionField(15, F); }
  DIArray getTemplateParams() const { return getFieldAs<DIArray>(16); }
  DISubprogram getFunctionDeclaration() const {
    return getFieldAs<DISubprogram>(17);
  }
  MDNode *getVariablesNodes() const;
  DIArray getVariables() const;

  /// getScopeLineNumber - Get the beginning of the scope of the
  /// function, not necessarily where the name of the program
  /// starts.
  unsigned getScopeLineNumber() const { return getUnsignedField(19); }
};

/// DILexicalBlock - This is a wrapper for a lexical block.
class DILexicalBlock : public DIScope {
public:
  explicit DILexicalBlock(const MDNode *N = 0) : DIScope(N) {}
  DIScope getContext() const { return getFieldAs<DIScope>(2); }
  unsigned getLineNumber() const { return getUnsignedField(3); }
  unsigned getColumnNumber() const { return getUnsignedField(4); }
  bool Verify() const;
};

/// DILexicalBlockFile - This is a wrapper for a lexical block with
/// a filename change.
class DILexicalBlockFile : public DIScope {
public:
  explicit DILexicalBlockFile(const MDNode *N = 0) : DIScope(N) {}
  DIScope getContext() const {
    if (getScope().isSubprogram())
      return getScope();
    return getScope().getContext();
  }
  unsigned getLineNumber() const { return getScope().getLineNumber(); }
  unsigned getColumnNumber() const { return getScope().getColumnNumber(); }
  DILexicalBlock getScope() const { return getFieldAs<DILexicalBlock>(2); }
  bool Verify() const;
};

/// DINameSpace - A wrapper for a C++ style name space.
class DINameSpace : public DIScope {
  friend class DIDescriptor;
  void printInternal(raw_ostream &OS) const;

public:
  explicit DINameSpace(const MDNode *N = 0) : DIScope(N) {}
  DIScope getContext() const { return getFieldAs<DIScope>(2); }
  StringRef getName() const { return getStringField(3); }
  unsigned getLineNumber() const { return getUnsignedField(4); }
  bool Verify() const;
};

/// DITemplateTypeParameter - This is a wrapper for template type parameter.
class DITemplateTypeParameter : public DIDescriptor {
public:
  explicit DITemplateTypeParameter(const MDNode *N = 0) : DIDescriptor(N) {}

  DIScopeRef getContext() const { return getFieldAs<DIScopeRef>(1); }
  StringRef getName() const { return getStringField(2); }
  DITypeRef getType() const { return getFieldAs<DITypeRef>(3); }
  StringRef getFilename() const { return getFieldAs<DIFile>(4).getFilename(); }
  StringRef getDirectory() const {
    return getFieldAs<DIFile>(4).getDirectory();
  }
  unsigned getLineNumber() const { return getUnsignedField(5); }
  unsigned getColumnNumber() const { return getUnsignedField(6); }
  bool Verify() const;
};

/// DITemplateValueParameter - This is a wrapper for template value parameter.
class DITemplateValueParameter : public DIDescriptor {
public:
  explicit DITemplateValueParameter(const MDNode *N = 0) : DIDescriptor(N) {}

  DIScopeRef getContext() const { return getFieldAs<DIScopeRef>(1); }
  StringRef getName() const { return getStringField(2); }
  DITypeRef getType() const { return getFieldAs<DITypeRef>(3); }
  Value *getValue() const;
  StringRef getFilename() const { return getFieldAs<DIFile>(5).getFilename(); }
  StringRef getDirectory() const {
    return getFieldAs<DIFile>(5).getDirectory();
  }
  unsigned getLineNumber() const { return getUnsignedField(6); }
  unsigned getColumnNumber() const { return getUnsignedField(7); }
  bool Verify() const;
};

/// DIGlobalVariable - This is a wrapper for a global variable.
class DIGlobalVariable : public DIDescriptor {
  friend class DIDescriptor;
  void printInternal(raw_ostream &OS) const;

public:
  explicit DIGlobalVariable(const MDNode *N = 0) : DIDescriptor(N) {}

  DIScope getContext() const { return getFieldAs<DIScope>(2); }
  StringRef getName() const { return getStringField(3); }
  StringRef getDisplayName() const { return getStringField(4); }
  StringRef getLinkageName() const { return getStringField(5); }
  StringRef getFilename() const { return getFieldAs<DIFile>(6).getFilename(); }
  StringRef getDirectory() const {
    return getFieldAs<DIFile>(6).getDirectory();
  }

  unsigned getLineNumber() const { return getUnsignedField(7); }
  DIType getType() const { return getFieldAs<DIType>(8); }
  unsigned isLocalToUnit() const { return getUnsignedField(9); }
  unsigned isDefinition() const { return getUnsignedField(10); }

  GlobalVariable *getGlobal() const { return getGlobalVariableField(11); }
  Constant *getConstant() const { return getConstantField(11); }
  DIDerivedType getStaticDataMemberDeclaration() const {
    return getFieldAs<DIDerivedType>(12);
  }

  /// Verify - Verify that a global variable descriptor is well formed.
  bool Verify() const;
};

/// DIVariable - This is a wrapper for a variable (e.g. parameter, local,
/// global etc).
class DIVariable : public DIDescriptor {
  friend class DIDescriptor;
  void printInternal(raw_ostream &OS) const;

public:
  explicit DIVariable(const MDNode *N = 0) : DIDescriptor(N) {}

  DIScope getContext() const { return getFieldAs<DIScope>(1); }
  StringRef getName() const { return getStringField(2); }
  DIFile getFile() const { return getFieldAs<DIFile>(3); }
  unsigned getLineNumber() const { return (getUnsignedField(4) << 8) >> 8; }
  unsigned getArgNumber() const {
    unsigned L = getUnsignedField(4);
    return L >> 24;
  }
  DIType getType() const { return getFieldAs<DIType>(5); }

  /// isArtificial - Return true if this variable is marked as "artificial".
  bool isArtificial() const {
    return (getUnsignedField(6) & FlagArtificial) != 0;
  }

  bool isObjectPointer() const {
    return (getUnsignedField(6) & FlagObjectPointer) != 0;
  }

  /// \brief Return true if this variable is represented as a pointer.
  bool isIndirect() const {
    return (getUnsignedField(6) & FlagIndirectVariable) != 0;
  }

  /// getInlinedAt - If this variable is inlined then return inline location.
  MDNode *getInlinedAt() const;

  /// Verify - Verify that a variable descriptor is well formed.
  bool Verify() const;

  /// HasComplexAddr - Return true if the variable has a complex address.
  bool hasComplexAddress() const { return getNumAddrElements() > 0; }

  unsigned getNumAddrElements() const;

  uint64_t getAddrElement(unsigned Idx) const {
    return getUInt64Field(Idx + 8);
  }

  /// isBlockByrefVariable - Return true if the variable was declared as
  /// a "__block" variable (Apple Blocks).
  bool isBlockByrefVariable() const { return getType().isBlockByrefStruct(); }

  /// isInlinedFnArgument - Return true if this variable provides debugging
  /// information for an inlined function arguments.
  bool isInlinedFnArgument(const Function *CurFn);

  void printExtendedName(raw_ostream &OS) const;
};

/// DILocation - This object holds location information. This object
/// is not associated with any DWARF tag.
class DILocation : public DIDescriptor {
public:
  explicit DILocation(const MDNode *N) : DIDescriptor(N) {}

  unsigned getLineNumber() const { return getUnsignedField(0); }
  unsigned getColumnNumber() const { return getUnsignedField(1); }
  DIScope getScope() const { return getFieldAs<DIScope>(2); }
  DILocation getOrigLocation() const { return getFieldAs<DILocation>(3); }
  StringRef getFilename() const { return getScope().getFilename(); }
  StringRef getDirectory() const { return getScope().getDirectory(); }
  bool Verify() const;
};

class DIObjCProperty : public DIDescriptor {
  friend class DIDescriptor;
  void printInternal(raw_ostream &OS) const;

public:
  explicit DIObjCProperty(const MDNode *N) : DIDescriptor(N) {}

  StringRef getObjCPropertyName() const { return getStringField(1); }
  DIFile getFile() const { return getFieldAs<DIFile>(2); }
  unsigned getLineNumber() const { return getUnsignedField(3); }

  StringRef getObjCPropertyGetterName() const { return getStringField(4); }
  StringRef getObjCPropertySetterName() const { return getStringField(5); }
  bool isReadOnlyObjCProperty() const {
    return (getUnsignedField(6) & dwarf::DW_APPLE_PROPERTY_readonly) != 0;
  }
  bool isReadWriteObjCProperty() const {
    return (getUnsignedField(6) & dwarf::DW_APPLE_PROPERTY_readwrite) != 0;
  }
  bool isAssignObjCProperty() const {
    return (getUnsignedField(6) & dwarf::DW_APPLE_PROPERTY_assign) != 0;
  }
  bool isRetainObjCProperty() const {
    return (getUnsignedField(6) & dwarf::DW_APPLE_PROPERTY_retain) != 0;
  }
  bool isCopyObjCProperty() const {
    return (getUnsignedField(6) & dwarf::DW_APPLE_PROPERTY_copy) != 0;
  }
  bool isNonAtomicObjCProperty() const {
    return (getUnsignedField(6) & dwarf::DW_APPLE_PROPERTY_nonatomic) != 0;
  }

  DIType getType() const { return getFieldAs<DIType>(7); }

  /// Verify - Verify that a derived type descriptor is well formed.
  bool Verify() const;
};

/// \brief An imported module (C++ using directive or similar).
class DIImportedEntity : public DIDescriptor {
  friend class DIDescriptor;
  void printInternal(raw_ostream &OS) const;

public:
  explicit DIImportedEntity(const MDNode *N) : DIDescriptor(N) {}
  DIScope getContext() const { return getFieldAs<DIScope>(1); }
  DIDescriptor getEntity() const { return getFieldAs<DIDescriptor>(2); }
  unsigned getLineNumber() const { return getUnsignedField(3); }
  StringRef getName() const { return getStringField(4); }
  bool Verify() const;
};

/// getDISubprogram - Find subprogram that is enclosing this scope.
DISubprogram getDISubprogram(const MDNode *Scope);

/// getDICompositeType - Find underlying composite type.
DICompositeType getDICompositeType(DIType T);

/// getOrInsertFnSpecificMDNode - Return a NameMDNode that is suitable
/// to hold function specific information.
NamedMDNode *getOrInsertFnSpecificMDNode(Module &M, DISubprogram SP);

/// getFnSpecificMDNode - Return a NameMDNode, if available, that is
/// suitable to hold function specific information.
NamedMDNode *getFnSpecificMDNode(const Module &M, DISubprogram SP);

/// createInlinedVariable - Create a new inlined variable based on current
/// variable.
/// @param DV            Current Variable.
/// @param InlinedScope  Location at current variable is inlined.
DIVariable createInlinedVariable(MDNode *DV, MDNode *InlinedScope,
                                 LLVMContext &VMContext);

/// cleanseInlinedVariable - Remove inlined scope from the variable.
DIVariable cleanseInlinedVariable(MDNode *DV, LLVMContext &VMContext);

/// Construct DITypeIdentifierMap by going through retained types of each CU.
DITypeIdentifierMap generateDITypeIdentifierMap(const NamedMDNode *CU_Nodes);

/// DebugInfoFinder tries to list all debug info MDNodes used in a module. To
/// list debug info MDNodes used by an instruction, DebugInfoFinder uses
/// processDeclare, processValue and processLocation to handle DbgDeclareInst,
/// DbgValueInst and DbgLoc attached to instructions. processModule will go
/// through all DICompileUnits in llvm.dbg.cu and list debug info MDNodes
/// used by the CUs.
class DebugInfoFinder {
public:
  /// processModule - Process entire module and collect debug info
  /// anchors.
  void processModule(const Module &M);

  /// processDeclare - Process DbgDeclareInst.
  void processDeclare(const DbgDeclareInst *DDI);
  /// Process DbgValueInst.
  void processValue(const DbgValueInst *DVI);
  /// processLocation - Process DILocation.
  void processLocation(DILocation Loc);

  /// Clear all lists.
  void reset();

private:
  /// processType - Process DIType.
  void processType(DIType DT);

  /// processLexicalBlock - Process DILexicalBlock.
  void processLexicalBlock(DILexicalBlock LB);

  /// processSubprogram - Process DISubprogram.
  void processSubprogram(DISubprogram SP);

  void processScope(DIScope Scope);

  /// addCompileUnit - Add compile unit into CUs.
  bool addCompileUnit(DICompileUnit CU);

  /// addGlobalVariable - Add global variable into GVs.
  bool addGlobalVariable(DIGlobalVariable DIG);

  // addSubprogram - Add subprogram into SPs.
  bool addSubprogram(DISubprogram SP);

  /// addType - Add type into Tys.
  bool addType(DIType DT);

  bool addScope(DIScope Scope);

public:
  typedef SmallVectorImpl<MDNode *>::const_iterator iterator;
  iterator compile_unit_begin() const { return CUs.begin(); }
  iterator compile_unit_end() const { return CUs.end(); }
  iterator subprogram_begin() const { return SPs.begin(); }
  iterator subprogram_end() const { return SPs.end(); }
  iterator global_variable_begin() const { return GVs.begin(); }
  iterator global_variable_end() const { return GVs.end(); }
  iterator type_begin() const { return TYs.begin(); }
  iterator type_end() const { return TYs.end(); }
  iterator scope_begin() const { return Scopes.begin(); }
  iterator scope_end() const { return Scopes.end(); }

  unsigned compile_unit_count() const { return CUs.size(); }
  unsigned global_variable_count() const { return GVs.size(); }
  unsigned subprogram_count() const { return SPs.size(); }
  unsigned type_count() const { return TYs.size(); }
  unsigned scope_count() const { return Scopes.size(); }

private:
  SmallVector<MDNode *, 8> CUs;    // Compile Units
  SmallVector<MDNode *, 8> SPs;    // Subprograms
  SmallVector<MDNode *, 8> GVs;    // Global Variables;
  SmallVector<MDNode *, 8> TYs;    // Types
  SmallVector<MDNode *, 8> Scopes; // Scopes
  SmallPtrSet<MDNode *, 64> NodesSeen;
  DITypeIdentifierMap TypeIdentifierMap;
};
} // end namespace llvm

#endif