aboutsummaryrefslogtreecommitdiffstats
path: root/source/Plugins/SymbolFile/DWARF/DWARFUnit.cpp
blob: f44b2bb97b2b08cb0c3d1c97dd153b1d4a9ddd96 (plain) (blame)
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
//===-- DWARFUnit.cpp -------------------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "DWARFUnit.h"

#include "lldb/Core/Module.h"
#include "lldb/Host/StringConvert.h"
#include "lldb/Symbol/CompileUnit.h"
#include "lldb/Symbol/LineTable.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Utility/LLDBAssert.h"
#include "lldb/Utility/StreamString.h"
#include "lldb/Utility/Timer.h"

#include "DWARFDIECollection.h"
#include "DWARFDebugAranges.h"
#include "DWARFDebugInfo.h"
#include "LogChannelDWARF.h"
#include "SymbolFileDWARFDebugMap.h"
#include "SymbolFileDWARFDwo.h"

using namespace lldb;
using namespace lldb_private;
using namespace std;

extern int g_verbose;

DWARFUnit::DWARFUnit(SymbolFileDWARF *dwarf)
    : m_dwarf(dwarf), m_cancel_scopes(false) {}

DWARFUnit::~DWARFUnit() {}

//----------------------------------------------------------------------
// Parses first DIE of a compile unit.
//----------------------------------------------------------------------
void DWARFUnit::ExtractUnitDIEIfNeeded() {
  {
    llvm::sys::ScopedReader lock(m_first_die_mutex);
    if (m_first_die)
      return; // Already parsed
  }
  llvm::sys::ScopedWriter lock(m_first_die_mutex);
  if (m_first_die)
    return; // Already parsed

  static Timer::Category func_cat(LLVM_PRETTY_FUNCTION);
  Timer scoped_timer(
      func_cat, "%8.8x: DWARFUnit::ExtractUnitDIEIfNeeded()", m_offset);

  // Set the offset to that of the first DIE and calculate the start of the
  // next compilation unit header.
  lldb::offset_t offset = GetFirstDIEOffset();

  // We are in our compile unit, parse starting at the offset we were told to
  // parse
  const DWARFDataExtractor &data = GetData();
  DWARFFormValue::FixedFormSizes fixed_form_sizes =
      DWARFFormValue::GetFixedFormSizesForAddressSize(GetAddressByteSize(),
                                                      IsDWARF64());
  if (offset < GetNextCompileUnitOffset() &&
      m_first_die.FastExtract(data, this, fixed_form_sizes, &offset)) {
    AddUnitDIE(m_first_die);
    return;
  }

  ExtractDIEsEndCheck(offset);
}

//----------------------------------------------------------------------
// Parses a compile unit and indexes its DIEs if it hasn't already been done.
// It will leave this compile unit extracted forever.
//----------------------------------------------------------------------
void DWARFUnit::ExtractDIEsIfNeeded() {
  m_cancel_scopes = true;

  {
    llvm::sys::ScopedReader lock(m_die_array_mutex);
    if (!m_die_array.empty())
      return; // Already parsed
  }
  llvm::sys::ScopedWriter lock(m_die_array_mutex);
  if (!m_die_array.empty())
    return; // Already parsed

  ExtractDIEsRWLocked();
}

//----------------------------------------------------------------------
// Parses a compile unit and indexes its DIEs if it hasn't already been done.
// It will clear this compile unit after returned instance gets out of scope,
// no other ScopedExtractDIEs instance is running for this compile unit
// and no ExtractDIEsIfNeeded() has been executed during this ScopedExtractDIEs
// lifetime.
//----------------------------------------------------------------------
DWARFUnit::ScopedExtractDIEs DWARFUnit::ExtractDIEsScoped() {
  ScopedExtractDIEs scoped(this);

  {
    llvm::sys::ScopedReader lock(m_die_array_mutex);
    if (!m_die_array.empty())
      return scoped; // Already parsed
  }
  llvm::sys::ScopedWriter lock(m_die_array_mutex);
  if (!m_die_array.empty())
    return scoped; // Already parsed

  // Otherwise m_die_array would be already populated.
  lldbassert(!m_cancel_scopes);

  ExtractDIEsRWLocked();
  scoped.m_clear_dies = true;
  return scoped;
}

DWARFUnit::ScopedExtractDIEs::ScopedExtractDIEs(DWARFUnit *cu) : m_cu(cu) {
  lldbassert(m_cu);
  m_cu->m_die_array_scoped_mutex.lock_shared();
}

DWARFUnit::ScopedExtractDIEs::~ScopedExtractDIEs() {
  if (!m_cu)
    return;
  m_cu->m_die_array_scoped_mutex.unlock_shared();
  if (!m_clear_dies || m_cu->m_cancel_scopes)
    return;
  // Be sure no other ScopedExtractDIEs is running anymore.
  llvm::sys::ScopedWriter lock_scoped(m_cu->m_die_array_scoped_mutex);
  llvm::sys::ScopedWriter lock(m_cu->m_die_array_mutex);
  if (m_cu->m_cancel_scopes)
    return;
  m_cu->ClearDIEsRWLocked();
}

DWARFUnit::ScopedExtractDIEs::ScopedExtractDIEs(ScopedExtractDIEs &&rhs)
    : m_cu(rhs.m_cu), m_clear_dies(rhs.m_clear_dies) {
  rhs.m_cu = nullptr;
}

DWARFUnit::ScopedExtractDIEs &DWARFUnit::ScopedExtractDIEs::operator=(
    DWARFUnit::ScopedExtractDIEs &&rhs) {
  m_cu = rhs.m_cu;
  rhs.m_cu = nullptr;
  m_clear_dies = rhs.m_clear_dies;
  return *this;
}

//----------------------------------------------------------------------
// Parses a compile unit and indexes its DIEs, m_die_array_mutex must be
// held R/W and m_die_array must be empty.
//----------------------------------------------------------------------
void DWARFUnit::ExtractDIEsRWLocked() {
  llvm::sys::ScopedWriter first_die_lock(m_first_die_mutex);

  static Timer::Category func_cat(LLVM_PRETTY_FUNCTION);
  Timer scoped_timer(
      func_cat, "%8.8x: DWARFUnit::ExtractDIEsIfNeeded()", m_offset);

  // Set the offset to that of the first DIE and calculate the start of the
  // next compilation unit header.
  lldb::offset_t offset = GetFirstDIEOffset();
  lldb::offset_t next_cu_offset = GetNextCompileUnitOffset();

  DWARFDebugInfoEntry die;
  // Keep a flat array of the DIE for binary lookup by DIE offset
  Log *log(
      LogChannelDWARF::GetLogIfAny(DWARF_LOG_DEBUG_INFO | DWARF_LOG_LOOKUPS));
  if (log) {
    m_dwarf->GetObjectFile()->GetModule()->LogMessageVerboseBacktrace(
        log,
        "DWARFUnit::ExtractDIEsIfNeeded () for compile unit at "
        ".debug_info[0x%8.8x]",
        GetOffset());
  }

  uint32_t depth = 0;
  // We are in our compile unit, parse starting at the offset we were told to
  // parse
  const DWARFDataExtractor &data = GetData();
  std::vector<uint32_t> die_index_stack;
  die_index_stack.reserve(32);
  die_index_stack.push_back(0);
  bool prev_die_had_children = false;
  DWARFFormValue::FixedFormSizes fixed_form_sizes =
      DWARFFormValue::GetFixedFormSizesForAddressSize(GetAddressByteSize(),
                                                      IsDWARF64());
  while (offset < next_cu_offset &&
         die.FastExtract(data, this, fixed_form_sizes, &offset)) {
    //        if (log)
    //            log->Printf("0x%8.8x: %*.*s%s%s",
    //                        die.GetOffset(),
    //                        depth * 2, depth * 2, "",
    //                        DW_TAG_value_to_name (die.Tag()),
    //                        die.HasChildren() ? " *" : "");

    const bool null_die = die.IsNULL();
    if (depth == 0) {
      assert(m_die_array.empty() && "Compile unit DIE already added");

      // The average bytes per DIE entry has been seen to be around 14-20 so
      // lets pre-reserve half of that since we are now stripping the NULL
      // tags.

      // Only reserve the memory if we are adding children of the main
      // compile unit DIE. The compile unit DIE is always the first entry, so
      // if our size is 1, then we are adding the first compile unit child
      // DIE and should reserve the memory.
      m_die_array.reserve(GetDebugInfoSize() / 24);
      m_die_array.push_back(die);

      if (!m_first_die)
        AddUnitDIE(m_die_array.front());
    } else {
      if (null_die) {
        if (prev_die_had_children) {
          // This will only happen if a DIE says is has children but all it
          // contains is a NULL tag. Since we are removing the NULL DIEs from
          // the list (saves up to 25% in C++ code), we need a way to let the
          // DIE know that it actually doesn't have children.
          if (!m_die_array.empty())
            m_die_array.back().SetEmptyChildren(true);
        }
      } else {
        die.SetParentIndex(m_die_array.size() - die_index_stack[depth - 1]);

        if (die_index_stack.back())
          m_die_array[die_index_stack.back()].SetSiblingIndex(
              m_die_array.size() - die_index_stack.back());

        // Only push the DIE if it isn't a NULL DIE
        m_die_array.push_back(die);
      }
    }

    if (null_die) {
      // NULL DIE.
      if (!die_index_stack.empty())
        die_index_stack.pop_back();

      if (depth > 0)
        --depth;
      if (depth == 0)
        break; // We are done with this compile unit!

      prev_die_had_children = false;
    } else {
      die_index_stack.back() = m_die_array.size() - 1;
      // Normal DIE
      const bool die_has_children = die.HasChildren();
      if (die_has_children) {
        die_index_stack.push_back(0);
        ++depth;
      }
      prev_die_had_children = die_has_children;
    }
  }

  if (!m_die_array.empty()) {
    lldbassert(!m_first_die || m_first_die == m_die_array.front());
    m_first_die = m_die_array.front();
  }

  m_die_array.shrink_to_fit();

  ExtractDIEsEndCheck(offset);

  if (m_dwo_symbol_file) {
    DWARFUnit *dwo_cu = m_dwo_symbol_file->GetCompileUnit();
    dwo_cu->ExtractDIEsIfNeeded();
  }
}

//--------------------------------------------------------------------------
// Final checks for both ExtractUnitDIEIfNeeded() and ExtractDIEsIfNeeded().
//--------------------------------------------------------------------------
void DWARFUnit::ExtractDIEsEndCheck(lldb::offset_t offset) const {
  // Give a little bit of info if we encounter corrupt DWARF (our offset should
  // always terminate at or before the start of the next compilation unit
  // header).
  if (offset > GetNextCompileUnitOffset()) {
    m_dwarf->GetObjectFile()->GetModule()->ReportWarning(
        "DWARF compile unit extends beyond its bounds cu 0x%8.8x at "
        "0x%8.8" PRIx64 "\n",
        GetOffset(), offset);
  }

  Log *log(LogChannelDWARF::GetLogIfAll(DWARF_LOG_DEBUG_INFO));
  if (log && log->GetVerbose()) {
    StreamString strm;
    Dump(&strm);
    if (m_die_array.empty())
      strm.Printf("error: no DIE for compile unit");
    else
      m_die_array[0].Dump(m_dwarf, this, strm, UINT32_MAX);
    log->PutString(strm.GetString());
  }
}

// m_die_array_mutex must be already held as read/write.
void DWARFUnit::AddUnitDIE(const DWARFDebugInfoEntry &cu_die) {
  uint64_t base_addr = cu_die.GetAttributeValueAsAddress(
      m_dwarf, this, DW_AT_low_pc, LLDB_INVALID_ADDRESS);
  if (base_addr == LLDB_INVALID_ADDRESS)
    base_addr = cu_die.GetAttributeValueAsAddress(
        m_dwarf, this, DW_AT_entry_pc, 0);
  SetBaseAddress(base_addr);

  std::unique_ptr<SymbolFileDWARFDwo> dwo_symbol_file =
      m_dwarf->GetDwoSymbolFileForCompileUnit(*this, cu_die);
  if (!dwo_symbol_file)
    return;

  DWARFUnit *dwo_cu = dwo_symbol_file->GetCompileUnit();
  if (!dwo_cu)
    return; // Can't fetch the compile unit from the dwo file.

  DWARFBaseDIE dwo_cu_die = dwo_cu->GetUnitDIEOnly();
  if (!dwo_cu_die.IsValid())
    return; // Can't fetch the compile unit DIE from the dwo file.

  uint64_t main_dwo_id =
      cu_die.GetAttributeValueAsUnsigned(m_dwarf, this, DW_AT_GNU_dwo_id, 0);
  uint64_t sub_dwo_id =
      dwo_cu_die.GetAttributeValueAsUnsigned(DW_AT_GNU_dwo_id, 0);
  if (main_dwo_id != sub_dwo_id)
    return; // The 2 dwo ID isn't match. Don't use the dwo file as it belongs to
  // a differectn compilation.

  m_dwo_symbol_file = std::move(dwo_symbol_file);

  dw_addr_t addr_base =
      cu_die.GetAttributeValueAsUnsigned(m_dwarf, this, DW_AT_GNU_addr_base, 0);
  dw_addr_t ranges_base = cu_die.GetAttributeValueAsUnsigned(
      m_dwarf, this, DW_AT_GNU_ranges_base, 0);
  dwo_cu->SetAddrBase(addr_base, ranges_base, m_offset);
}

DWARFDIE DWARFUnit::LookupAddress(const dw_addr_t address) {
  if (DIE()) {
    const DWARFDebugAranges &func_aranges = GetFunctionAranges();

    // Re-check the aranges auto pointer contents in case it was created above
    if (!func_aranges.IsEmpty())
      return GetDIE(func_aranges.FindAddress(address));
  }
  return DWARFDIE();
}

size_t DWARFUnit::AppendDIEsWithTag(const dw_tag_t tag,
				    DWARFDIECollection &dies,
				    uint32_t depth) const {
  size_t old_size = dies.Size();
  {
    llvm::sys::ScopedReader lock(m_die_array_mutex);
    DWARFDebugInfoEntry::const_iterator pos;
    DWARFDebugInfoEntry::const_iterator end = m_die_array.end();
    for (pos = m_die_array.begin(); pos != end; ++pos) {
      if (pos->Tag() == tag)
        dies.Append(DWARFDIE(this, &(*pos)));
    }
  }

  // Return the number of DIEs added to the collection
  return dies.Size() - old_size;
}


lldb::user_id_t DWARFUnit::GetID() const {
  dw_offset_t local_id =
      m_base_obj_offset != DW_INVALID_OFFSET ? m_base_obj_offset : m_offset;
  if (m_dwarf)
    return DIERef(local_id, local_id).GetUID(m_dwarf);
  else
    return local_id;
}

dw_offset_t DWARFUnit::GetNextCompileUnitOffset() const {
  return m_offset + GetLengthByteSize() + GetLength();
}

size_t DWARFUnit::GetDebugInfoSize() const {
  return GetLengthByteSize() + GetLength() - GetHeaderByteSize();
}

const DWARFAbbreviationDeclarationSet *DWARFUnit::GetAbbreviations() const {
  return m_abbrevs;
}

dw_offset_t DWARFUnit::GetAbbrevOffset() const {
  return m_abbrevs ? m_abbrevs->GetOffset() : DW_INVALID_OFFSET;
}

void DWARFUnit::SetAddrBase(dw_addr_t addr_base,
                            dw_addr_t ranges_base,
                            dw_offset_t base_obj_offset) {
  m_addr_base = addr_base;
  m_ranges_base = ranges_base;
  m_base_obj_offset = base_obj_offset;
}

// It may be called only with m_die_array_mutex held R/W.
void DWARFUnit::ClearDIEsRWLocked() {
  m_die_array.clear();
  m_die_array.shrink_to_fit();

  if (m_dwo_symbol_file)
    m_dwo_symbol_file->GetCompileUnit()->ClearDIEsRWLocked();
}

void DWARFUnit::BuildAddressRangeTable(SymbolFileDWARF *dwarf,
                                       DWARFDebugAranges *debug_aranges) {
  // This function is usually called if there in no .debug_aranges section in
  // order to produce a compile unit level set of address ranges that is
  // accurate.

  size_t num_debug_aranges = debug_aranges->GetNumRanges();

  // First get the compile unit DIE only and check if it has a DW_AT_ranges
  const DWARFDebugInfoEntry *die = GetUnitDIEPtrOnly();

  const dw_offset_t cu_offset = GetOffset();
  if (die) {
    DWARFRangeList ranges;
    const size_t num_ranges =
        die->GetAttributeAddressRanges(dwarf, this, ranges, false);
    if (num_ranges > 0) {
      // This compile unit has DW_AT_ranges, assume this is correct if it is
      // present since clang no longer makes .debug_aranges by default and it
      // emits DW_AT_ranges for DW_TAG_compile_units. GCC also does this with
      // recent GCC builds.
      for (size_t i = 0; i < num_ranges; ++i) {
        const DWARFRangeList::Entry &range = ranges.GetEntryRef(i);
        debug_aranges->AppendRange(cu_offset, range.GetRangeBase(),
                                   range.GetRangeEnd());
      }

      return; // We got all of our ranges from the DW_AT_ranges attribute
    }
  }
  // We don't have a DW_AT_ranges attribute, so we need to parse the DWARF

  // If the DIEs weren't parsed, then we don't want all dies for all compile
  // units to stay loaded when they weren't needed. So we can end up parsing
  // the DWARF and then throwing them all away to keep memory usage down.
  ScopedExtractDIEs clear_dies(ExtractDIEsScoped());

  die = DIEPtr();
  if (die)
    die->BuildAddressRangeTable(dwarf, this, debug_aranges);

  if (debug_aranges->GetNumRanges() == num_debug_aranges) {
    // We got nothing from the functions, maybe we have a line tables only
    // situation. Check the line tables and build the arange table from this.
    SymbolContext sc;
    sc.comp_unit = dwarf->GetCompUnitForDWARFCompUnit(this);
    if (sc.comp_unit) {
      SymbolFileDWARFDebugMap *debug_map_sym_file =
          m_dwarf->GetDebugMapSymfile();
      if (debug_map_sym_file == NULL) {
        LineTable *line_table = sc.comp_unit->GetLineTable();

        if (line_table) {
          LineTable::FileAddressRanges file_ranges;
          const bool append = true;
          const size_t num_ranges =
              line_table->GetContiguousFileAddressRanges(file_ranges, append);
          for (uint32_t idx = 0; idx < num_ranges; ++idx) {
            const LineTable::FileAddressRanges::Entry &range =
                file_ranges.GetEntryRef(idx);
            debug_aranges->AppendRange(cu_offset, range.GetRangeBase(),
                                       range.GetRangeEnd());
          }
        }
      } else
        debug_map_sym_file->AddOSOARanges(dwarf, debug_aranges);
    }
  }

  if (debug_aranges->GetNumRanges() == num_debug_aranges) {
    // We got nothing from the functions, maybe we have a line tables only
    // situation. Check the line tables and build the arange table from this.
    SymbolContext sc;
    sc.comp_unit = dwarf->GetCompUnitForDWARFCompUnit(this);
    if (sc.comp_unit) {
      LineTable *line_table = sc.comp_unit->GetLineTable();

      if (line_table) {
        LineTable::FileAddressRanges file_ranges;
        const bool append = true;
        const size_t num_ranges =
            line_table->GetContiguousFileAddressRanges(file_ranges, append);
        for (uint32_t idx = 0; idx < num_ranges; ++idx) {
          const LineTable::FileAddressRanges::Entry &range =
              file_ranges.GetEntryRef(idx);
          debug_aranges->AppendRange(GetOffset(), range.GetRangeBase(),
                                     range.GetRangeEnd());
        }
      }
    }
  }
}

lldb::ByteOrder DWARFUnit::GetByteOrder() const {
  return m_dwarf->GetObjectFile()->GetByteOrder();
}

TypeSystem *DWARFUnit::GetTypeSystem() {
  if (m_dwarf)
    return m_dwarf->GetTypeSystemForLanguage(GetLanguageType());
  else
    return nullptr;
}

DWARFFormValue::FixedFormSizes DWARFUnit::GetFixedFormSizes() {
  return DWARFFormValue::GetFixedFormSizesForAddressSize(GetAddressByteSize(),
                                                         IsDWARF64());
}

void DWARFUnit::SetBaseAddress(dw_addr_t base_addr) { m_base_addr = base_addr; }

//----------------------------------------------------------------------
// Compare function DWARFDebugAranges::Range structures
//----------------------------------------------------------------------
static bool CompareDIEOffset(const DWARFDebugInfoEntry &die,
                             const dw_offset_t die_offset) {
  return die.GetOffset() < die_offset;
}

//----------------------------------------------------------------------
// GetDIE()
//
// Get the DIE (Debug Information Entry) with the specified offset by first
// checking if the DIE is contained within this compile unit and grabbing the
// DIE from this compile unit. Otherwise we grab the DIE from the DWARF file.
//----------------------------------------------------------------------
DWARFDIE
DWARFUnit::GetDIE(dw_offset_t die_offset) {
  if (die_offset != DW_INVALID_OFFSET) {
    if (GetDwoSymbolFile())
      return GetDwoSymbolFile()->GetCompileUnit()->GetDIE(die_offset);

    if (ContainsDIEOffset(die_offset)) {
      ExtractDIEsIfNeeded();
      DWARFDebugInfoEntry::const_iterator end = m_die_array.cend();
      DWARFDebugInfoEntry::const_iterator pos =
          lower_bound(m_die_array.cbegin(), end, die_offset, CompareDIEOffset);
      if (pos != end) {
        if (die_offset == (*pos).GetOffset())
          return DWARFDIE(this, &(*pos));
      }
    } else {
      // Don't specify the compile unit offset as we don't know it because the
      // DIE belongs to
      // a different compile unit in the same symbol file.
      return m_dwarf->DebugInfo()->GetDIEForDIEOffset(die_offset);
    }
  }
  return DWARFDIE(); // Not found
}

uint8_t DWARFUnit::GetAddressByteSize(const DWARFUnit *cu) {
  if (cu)
    return cu->GetAddressByteSize();
  return DWARFUnit::GetDefaultAddressSize();
}

bool DWARFUnit::IsDWARF64(const DWARFUnit *cu) {
  if (cu)
    return cu->IsDWARF64();
  return false;
}

uint8_t DWARFUnit::GetDefaultAddressSize() { return 4; }

void *DWARFUnit::GetUserData() const { return m_user_data; }

void DWARFUnit::SetUserData(void *d) {
  m_user_data = d;
  if (m_dwo_symbol_file)
    m_dwo_symbol_file->GetCompileUnit()->SetUserData(d);
}

bool DWARFUnit::Supports_DW_AT_APPLE_objc_complete_type() {
  if (GetProducer() == eProducerLLVMGCC)
    return false;
  return true;
}

bool DWARFUnit::DW_AT_decl_file_attributes_are_invalid() {
  // llvm-gcc makes completely invalid decl file attributes and won't ever be
  // fixed, so we need to know to ignore these.
  return GetProducer() == eProducerLLVMGCC;
}

bool DWARFUnit::Supports_unnamed_objc_bitfields() {
  if (GetProducer() == eProducerClang) {
    const uint32_t major_version = GetProducerVersionMajor();
    if (major_version > 425 ||
        (major_version == 425 && GetProducerVersionUpdate() >= 13))
      return true;
    else
      return false;
  }
  return true; // Assume all other compilers didn't have incorrect ObjC bitfield
               // info
}

SymbolFileDWARF *DWARFUnit::GetSymbolFileDWARF() const { return m_dwarf; }

void DWARFUnit::ParseProducerInfo() {
  m_producer_version_major = UINT32_MAX;
  m_producer_version_minor = UINT32_MAX;
  m_producer_version_update = UINT32_MAX;

  const DWARFDebugInfoEntry *die = GetUnitDIEPtrOnly();
  if (die) {

    const char *producer_cstr =
        die->GetAttributeValueAsString(m_dwarf, this, DW_AT_producer, NULL);
    if (producer_cstr) {
      RegularExpression llvm_gcc_regex(
          llvm::StringRef("^4\\.[012]\\.[01] \\(Based on Apple "
                          "Inc\\. build [0-9]+\\) \\(LLVM build "
                          "[\\.0-9]+\\)$"));
      if (llvm_gcc_regex.Execute(llvm::StringRef(producer_cstr))) {
        m_producer = eProducerLLVMGCC;
      } else if (strstr(producer_cstr, "clang")) {
        static RegularExpression g_clang_version_regex(
            llvm::StringRef("clang-([0-9]+)\\.([0-9]+)\\.([0-9]+)"));
        RegularExpression::Match regex_match(3);
        if (g_clang_version_regex.Execute(llvm::StringRef(producer_cstr),
                                          &regex_match)) {
          std::string str;
          if (regex_match.GetMatchAtIndex(producer_cstr, 1, str))
            m_producer_version_major =
                StringConvert::ToUInt32(str.c_str(), UINT32_MAX, 10);
          if (regex_match.GetMatchAtIndex(producer_cstr, 2, str))
            m_producer_version_minor =
                StringConvert::ToUInt32(str.c_str(), UINT32_MAX, 10);
          if (regex_match.GetMatchAtIndex(producer_cstr, 3, str))
            m_producer_version_update =
                StringConvert::ToUInt32(str.c_str(), UINT32_MAX, 10);
        }
        m_producer = eProducerClang;
      } else if (strstr(producer_cstr, "GNU"))
        m_producer = eProducerGCC;
    }
  }
  if (m_producer == eProducerInvalid)
    m_producer = eProcucerOther;
}

DWARFProducer DWARFUnit::GetProducer() {
  if (m_producer == eProducerInvalid)
    ParseProducerInfo();
  return m_producer;
}

uint32_t DWARFUnit::GetProducerVersionMajor() {
  if (m_producer_version_major == 0)
    ParseProducerInfo();
  return m_producer_version_major;
}

uint32_t DWARFUnit::GetProducerVersionMinor() {
  if (m_producer_version_minor == 0)
    ParseProducerInfo();
  return m_producer_version_minor;
}

uint32_t DWARFUnit::GetProducerVersionUpdate() {
  if (m_producer_version_update == 0)
    ParseProducerInfo();
  return m_producer_version_update;
}
LanguageType DWARFUnit::LanguageTypeFromDWARF(uint64_t val) {
  // Note: user languages between lo_user and hi_user must be handled
  // explicitly here.
  switch (val) {
  case DW_LANG_Mips_Assembler:
    return eLanguageTypeMipsAssembler;
  case DW_LANG_GOOGLE_RenderScript:
    return eLanguageTypeExtRenderScript;
  default:
    return static_cast<LanguageType>(val);
  }
}

LanguageType DWARFUnit::GetLanguageType() {
  if (m_language_type != eLanguageTypeUnknown)
    return m_language_type;

  const DWARFDebugInfoEntry *die = GetUnitDIEPtrOnly();
  if (die)
    m_language_type = LanguageTypeFromDWARF(
        die->GetAttributeValueAsUnsigned(m_dwarf, this, DW_AT_language, 0));
  return m_language_type;
}

bool DWARFUnit::GetIsOptimized() {
  if (m_is_optimized == eLazyBoolCalculate) {
    const DWARFDebugInfoEntry *die = GetUnitDIEPtrOnly();
    if (die) {
      m_is_optimized = eLazyBoolNo;
      if (die->GetAttributeValueAsUnsigned(m_dwarf, this, DW_AT_APPLE_optimized,
                                           0) == 1) {
        m_is_optimized = eLazyBoolYes;
      }
    }
  }
  return m_is_optimized == eLazyBoolYes;
}

SymbolFileDWARFDwo *DWARFUnit::GetDwoSymbolFile() const {
  return m_dwo_symbol_file.get();
}

dw_offset_t DWARFUnit::GetBaseObjOffset() const { return m_base_obj_offset; }

const DWARFDebugAranges &DWARFUnit::GetFunctionAranges() {
  if (m_func_aranges_ap.get() == NULL) {
    m_func_aranges_ap.reset(new DWARFDebugAranges());
    Log *log(LogChannelDWARF::GetLogIfAll(DWARF_LOG_DEBUG_ARANGES));

    if (log) {
      m_dwarf->GetObjectFile()->GetModule()->LogMessage(
          log,
          "DWARFUnit::GetFunctionAranges() for compile unit at "
          ".debug_info[0x%8.8x]",
          GetOffset());
    }
    const DWARFDebugInfoEntry *die = DIEPtr();
    if (die)
      die->BuildFunctionAddressRangeTable(m_dwarf, this,
                                          m_func_aranges_ap.get());

    if (m_dwo_symbol_file) {
      DWARFUnit *dwo_cu = m_dwo_symbol_file->GetCompileUnit();
      const DWARFDebugInfoEntry *dwo_die = dwo_cu->DIEPtr();
      if (dwo_die)
        dwo_die->BuildFunctionAddressRangeTable(m_dwo_symbol_file.get(), dwo_cu,
                                                m_func_aranges_ap.get());
    }

    const bool minimize = false;
    m_func_aranges_ap->Sort(minimize);
  }
  return *m_func_aranges_ap.get();
}