aboutsummaryrefslogtreecommitdiffstats
path: root/source/Plugins/SymbolFile/PDB/SymbolFilePDB.cpp
blob: 854e735b5f83e39868cb0b7d7a4b940efc812162 (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
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
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
//===-- SymbolFilePDB.cpp ---------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "SymbolFilePDB.h"

#include "PDBASTParser.h"
#include "PDBLocationToDWARFExpression.h"

#include "clang/Lex/Lexer.h"

#include "lldb/Core/Module.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Symbol/ClangASTContext.h"
#include "lldb/Symbol/CompileUnit.h"
#include "lldb/Symbol/LineTable.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Symbol/SymbolContext.h"
#include "lldb/Symbol/SymbolVendor.h"
#include "lldb/Symbol/TypeList.h"
#include "lldb/Symbol/TypeMap.h"
#include "lldb/Symbol/Variable.h"
#include "lldb/Utility/Log.h"
#include "lldb/Utility/RegularExpression.h"

#include "llvm/DebugInfo/PDB/GenericError.h"
#include "llvm/DebugInfo/PDB/IPDBDataStream.h"
#include "llvm/DebugInfo/PDB/IPDBEnumChildren.h"
#include "llvm/DebugInfo/PDB/IPDBLineNumber.h"
#include "llvm/DebugInfo/PDB/IPDBSectionContrib.h"
#include "llvm/DebugInfo/PDB/IPDBSourceFile.h"
#include "llvm/DebugInfo/PDB/IPDBTable.h"
#include "llvm/DebugInfo/PDB/PDBSymbol.h"
#include "llvm/DebugInfo/PDB/PDBSymbolBlock.h"
#include "llvm/DebugInfo/PDB/PDBSymbolCompiland.h"
#include "llvm/DebugInfo/PDB/PDBSymbolCompilandDetails.h"
#include "llvm/DebugInfo/PDB/PDBSymbolData.h"
#include "llvm/DebugInfo/PDB/PDBSymbolExe.h"
#include "llvm/DebugInfo/PDB/PDBSymbolFunc.h"
#include "llvm/DebugInfo/PDB/PDBSymbolFuncDebugEnd.h"
#include "llvm/DebugInfo/PDB/PDBSymbolFuncDebugStart.h"
#include "llvm/DebugInfo/PDB/PDBSymbolPublicSymbol.h"
#include "llvm/DebugInfo/PDB/PDBSymbolTypeEnum.h"
#include "llvm/DebugInfo/PDB/PDBSymbolTypeTypedef.h"
#include "llvm/DebugInfo/PDB/PDBSymbolTypeUDT.h"

#include "Plugins/Language/CPlusPlus/CPlusPlusLanguage.h"
#include "Plugins/Language/CPlusPlus/MSVCUndecoratedNameParser.h"
#include "Plugins/SymbolFile/NativePDB/SymbolFileNativePDB.h"

#include <regex>

using namespace lldb;
using namespace lldb_private;
using namespace llvm::pdb;

namespace {
lldb::LanguageType TranslateLanguage(PDB_Lang lang) {
  switch (lang) {
  case PDB_Lang::Cpp:
    return lldb::LanguageType::eLanguageTypeC_plus_plus;
  case PDB_Lang::C:
    return lldb::LanguageType::eLanguageTypeC;
  case PDB_Lang::Swift:
    return lldb::LanguageType::eLanguageTypeSwift;
  default:
    return lldb::LanguageType::eLanguageTypeUnknown;
  }
}

bool ShouldAddLine(uint32_t requested_line, uint32_t actual_line,
                   uint32_t addr_length) {
  return ((requested_line == 0 || actual_line == requested_line) &&
          addr_length > 0);
}
} // namespace

static bool ShouldUseNativeReader() {
#if defined(_WIN32)
  llvm::StringRef use_native = ::getenv("LLDB_USE_NATIVE_PDB_READER");
  return use_native.equals_lower("on") || use_native.equals_lower("yes") ||
         use_native.equals_lower("1") || use_native.equals_lower("true");
#else
  return true;
#endif
}

void SymbolFilePDB::Initialize() {
  if (ShouldUseNativeReader()) {
    npdb::SymbolFileNativePDB::Initialize();
  } else {
    PluginManager::RegisterPlugin(GetPluginNameStatic(),
                                  GetPluginDescriptionStatic(), CreateInstance,
                                  DebuggerInitialize);
  }
}

void SymbolFilePDB::Terminate() {
  if (ShouldUseNativeReader()) {
    npdb::SymbolFileNativePDB::Terminate();
  } else {
    PluginManager::UnregisterPlugin(CreateInstance);
  }
}

void SymbolFilePDB::DebuggerInitialize(lldb_private::Debugger &debugger) {}

lldb_private::ConstString SymbolFilePDB::GetPluginNameStatic() {
  static ConstString g_name("pdb");
  return g_name;
}

const char *SymbolFilePDB::GetPluginDescriptionStatic() {
  return "Microsoft PDB debug symbol file reader.";
}

lldb_private::SymbolFile *
SymbolFilePDB::CreateInstance(ObjectFileSP objfile_sp) {
  return new SymbolFilePDB(std::move(objfile_sp));
}

SymbolFilePDB::SymbolFilePDB(lldb::ObjectFileSP objfile_sp)
    : SymbolFile(std::move(objfile_sp)), m_session_up(), m_global_scope_up() {}

SymbolFilePDB::~SymbolFilePDB() {}

uint32_t SymbolFilePDB::CalculateAbilities() {
  uint32_t abilities = 0;
  if (!m_objfile_sp)
    return 0;

  if (!m_session_up) {
    // Lazily load and match the PDB file, but only do this once.
    std::string exePath = m_objfile_sp->GetFileSpec().GetPath();
    auto error = loadDataForEXE(PDB_ReaderType::DIA, llvm::StringRef(exePath),
                                m_session_up);
    if (error) {
      llvm::consumeError(std::move(error));
      auto module_sp = m_objfile_sp->GetModule();
      if (!module_sp)
        return 0;
      // See if any symbol file is specified through `--symfile` option.
      FileSpec symfile = module_sp->GetSymbolFileFileSpec();
      if (!symfile)
        return 0;
      error = loadDataForPDB(PDB_ReaderType::DIA,
                             llvm::StringRef(symfile.GetPath()), m_session_up);
      if (error) {
        llvm::consumeError(std::move(error));
        return 0;
      }
    }
  }
  if (!m_session_up)
    return 0;

  auto enum_tables_up = m_session_up->getEnumTables();
  if (!enum_tables_up)
    return 0;
  while (auto table_up = enum_tables_up->getNext()) {
    if (table_up->getItemCount() == 0)
      continue;
    auto type = table_up->getTableType();
    switch (type) {
    case PDB_TableType::Symbols:
      // This table represents a store of symbols with types listed in
      // PDBSym_Type
      abilities |= (CompileUnits | Functions | Blocks | GlobalVariables |
                    LocalVariables | VariableTypes);
      break;
    case PDB_TableType::LineNumbers:
      abilities |= LineTables;
      break;
    default:
      break;
    }
  }
  return abilities;
}

void SymbolFilePDB::InitializeObject() {
  lldb::addr_t obj_load_address =
      m_objfile_sp->GetBaseAddress().GetFileAddress();
  lldbassert(obj_load_address && obj_load_address != LLDB_INVALID_ADDRESS);
  m_session_up->setLoadAddress(obj_load_address);
  if (!m_global_scope_up)
    m_global_scope_up = m_session_up->getGlobalScope();
  lldbassert(m_global_scope_up.get());
}

uint32_t SymbolFilePDB::CalculateNumCompileUnits() {
  auto compilands = m_global_scope_up->findAllChildren<PDBSymbolCompiland>();
  if (!compilands)
    return 0;

  // The linker could link *.dll (compiland language = LINK), or import
  // *.dll. For example, a compiland with name `Import:KERNEL32.dll` could be
  // found as a child of the global scope (PDB executable). Usually, such
  // compilands contain `thunk` symbols in which we are not interested for
  // now. However we still count them in the compiland list. If we perform
  // any compiland related activity, like finding symbols through
  // llvm::pdb::IPDBSession methods, such compilands will all be searched
  // automatically no matter whether we include them or not.
  uint32_t compile_unit_count = compilands->getChildCount();

  // The linker can inject an additional "dummy" compilation unit into the
  // PDB. Ignore this special compile unit for our purposes, if it is there.
  // It is always the last one.
  auto last_compiland_up = compilands->getChildAtIndex(compile_unit_count - 1);
  lldbassert(last_compiland_up.get());
  std::string name = last_compiland_up->getName();
  if (name == "* Linker *")
    --compile_unit_count;
  return compile_unit_count;
}

void SymbolFilePDB::GetCompileUnitIndex(
    const llvm::pdb::PDBSymbolCompiland &pdb_compiland, uint32_t &index) {
  auto results_up = m_global_scope_up->findAllChildren<PDBSymbolCompiland>();
  if (!results_up)
    return;
  auto uid = pdb_compiland.getSymIndexId();
  for (uint32_t cu_idx = 0; cu_idx < GetNumCompileUnits(); ++cu_idx) {
    auto compiland_up = results_up->getChildAtIndex(cu_idx);
    if (!compiland_up)
      continue;
    if (compiland_up->getSymIndexId() == uid) {
      index = cu_idx;
      return;
    }
  }
  index = UINT32_MAX;
  return;
}

std::unique_ptr<llvm::pdb::PDBSymbolCompiland>
SymbolFilePDB::GetPDBCompilandByUID(uint32_t uid) {
  return m_session_up->getConcreteSymbolById<PDBSymbolCompiland>(uid);
}

lldb::CompUnitSP SymbolFilePDB::ParseCompileUnitAtIndex(uint32_t index) {
  if (index >= GetNumCompileUnits())
    return CompUnitSP();

  // Assuming we always retrieve same compilands listed in same order through
  // `PDBSymbolExe::findAllChildren` method, otherwise using `index` to get a
  // compile unit makes no sense.
  auto results = m_global_scope_up->findAllChildren<PDBSymbolCompiland>();
  if (!results)
    return CompUnitSP();
  auto compiland_up = results->getChildAtIndex(index);
  if (!compiland_up)
    return CompUnitSP();
  return ParseCompileUnitForUID(compiland_up->getSymIndexId(), index);
}

lldb::LanguageType SymbolFilePDB::ParseLanguage(CompileUnit &comp_unit) {
  std::lock_guard<std::recursive_mutex> guard(GetModuleMutex());
  auto compiland_up = GetPDBCompilandByUID(comp_unit.GetID());
  if (!compiland_up)
    return lldb::eLanguageTypeUnknown;
  auto details = compiland_up->findOneChild<PDBSymbolCompilandDetails>();
  if (!details)
    return lldb::eLanguageTypeUnknown;
  return TranslateLanguage(details->getLanguage());
}

lldb_private::Function *
SymbolFilePDB::ParseCompileUnitFunctionForPDBFunc(const PDBSymbolFunc &pdb_func,
                                                  CompileUnit &comp_unit) {
  if (FunctionSP result = comp_unit.FindFunctionByUID(pdb_func.getSymIndexId()))
    return result.get();

  auto file_vm_addr = pdb_func.getVirtualAddress();
  if (file_vm_addr == LLDB_INVALID_ADDRESS || file_vm_addr == 0)
    return nullptr;

  auto func_length = pdb_func.getLength();
  AddressRange func_range =
      AddressRange(file_vm_addr, func_length,
                   GetObjectFile()->GetModule()->GetSectionList());
  if (!func_range.GetBaseAddress().IsValid())
    return nullptr;

  lldb_private::Type *func_type = ResolveTypeUID(pdb_func.getSymIndexId());
  if (!func_type)
    return nullptr;

  user_id_t func_type_uid = pdb_func.getSignatureId();

  Mangled mangled = GetMangledForPDBFunc(pdb_func);

  FunctionSP func_sp =
      std::make_shared<Function>(&comp_unit, pdb_func.getSymIndexId(),
                                 func_type_uid, mangled, func_type, func_range);

  comp_unit.AddFunction(func_sp);

  LanguageType lang = ParseLanguage(comp_unit);
  auto type_system_or_err = GetTypeSystemForLanguage(lang);
  if (auto err = type_system_or_err.takeError()) {
    LLDB_LOG_ERROR(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_SYMBOLS),
                   std::move(err), "Unable to parse PDBFunc");
    return nullptr;
  }

  ClangASTContext *clang_type_system =
    llvm::dyn_cast_or_null<ClangASTContext>(&type_system_or_err.get());
  if (!clang_type_system)
    return nullptr;
  clang_type_system->GetPDBParser()->GetDeclForSymbol(pdb_func);

  return func_sp.get();
}

size_t SymbolFilePDB::ParseFunctions(CompileUnit &comp_unit) {
  std::lock_guard<std::recursive_mutex> guard(GetModuleMutex());
  size_t func_added = 0;
  auto compiland_up = GetPDBCompilandByUID(comp_unit.GetID());
  if (!compiland_up)
    return 0;
  auto results_up = compiland_up->findAllChildren<PDBSymbolFunc>();
  if (!results_up)
    return 0;
  while (auto pdb_func_up = results_up->getNext()) {
    auto func_sp = comp_unit.FindFunctionByUID(pdb_func_up->getSymIndexId());
    if (!func_sp) {
      if (ParseCompileUnitFunctionForPDBFunc(*pdb_func_up, comp_unit))
        ++func_added;
    }
  }
  return func_added;
}

bool SymbolFilePDB::ParseLineTable(CompileUnit &comp_unit) {
  std::lock_guard<std::recursive_mutex> guard(GetModuleMutex());
  if (comp_unit.GetLineTable())
    return true;
  return ParseCompileUnitLineTable(comp_unit, 0);
}

bool SymbolFilePDB::ParseDebugMacros(CompileUnit &comp_unit) {
  // PDB doesn't contain information about macros
  return false;
}

bool SymbolFilePDB::ParseSupportFiles(
    CompileUnit &comp_unit, lldb_private::FileSpecList &support_files) {

  // In theory this is unnecessary work for us, because all of this information
  // is easily (and quickly) accessible from DebugInfoPDB, so caching it a
  // second time seems like a waste.  Unfortunately, there's no good way around
  // this short of a moderate refactor since SymbolVendor depends on being able
  // to cache this list.
  std::lock_guard<std::recursive_mutex> guard(GetModuleMutex());
  auto compiland_up = GetPDBCompilandByUID(comp_unit.GetID());
  if (!compiland_up)
    return false;
  auto files = m_session_up->getSourceFilesForCompiland(*compiland_up);
  if (!files || files->getChildCount() == 0)
    return false;

  while (auto file = files->getNext()) {
    FileSpec spec(file->getFileName(), FileSpec::Style::windows);
    support_files.AppendIfUnique(spec);
  }

  // LLDB uses the DWARF-like file numeration (one based),
  // the zeroth file is the compile unit itself
  support_files.Insert(0, comp_unit);

  return true;
}

bool SymbolFilePDB::ParseImportedModules(
    const lldb_private::SymbolContext &sc,
    std::vector<SourceModule> &imported_modules) {
  // PDB does not yet support module debug info
  return false;
}

static size_t ParseFunctionBlocksForPDBSymbol(
    uint64_t func_file_vm_addr, const llvm::pdb::PDBSymbol *pdb_symbol,
    lldb_private::Block *parent_block, bool is_top_parent) {
  assert(pdb_symbol && parent_block);

  size_t num_added = 0;
  switch (pdb_symbol->getSymTag()) {
  case PDB_SymType::Block:
  case PDB_SymType::Function: {
    Block *block = nullptr;
    auto &raw_sym = pdb_symbol->getRawSymbol();
    if (auto *pdb_func = llvm::dyn_cast<PDBSymbolFunc>(pdb_symbol)) {
      if (pdb_func->hasNoInlineAttribute())
        break;
      if (is_top_parent)
        block = parent_block;
      else
        break;
    } else if (llvm::dyn_cast<PDBSymbolBlock>(pdb_symbol)) {
      auto uid = pdb_symbol->getSymIndexId();
      if (parent_block->FindBlockByID(uid))
        break;
      if (raw_sym.getVirtualAddress() < func_file_vm_addr)
        break;

      auto block_sp = std::make_shared<Block>(pdb_symbol->getSymIndexId());
      parent_block->AddChild(block_sp);
      block = block_sp.get();
    } else
      llvm_unreachable("Unexpected PDB symbol!");

    block->AddRange(Block::Range(
        raw_sym.getVirtualAddress() - func_file_vm_addr, raw_sym.getLength()));
    block->FinalizeRanges();
    ++num_added;

    auto results_up = pdb_symbol->findAllChildren();
    if (!results_up)
      break;
    while (auto symbol_up = results_up->getNext()) {
      num_added += ParseFunctionBlocksForPDBSymbol(
          func_file_vm_addr, symbol_up.get(), block, false);
    }
  } break;
  default:
    break;
  }
  return num_added;
}

size_t SymbolFilePDB::ParseBlocksRecursive(Function &func) {
  std::lock_guard<std::recursive_mutex> guard(GetModuleMutex());
  size_t num_added = 0;
  auto uid = func.GetID();
  auto pdb_func_up = m_session_up->getConcreteSymbolById<PDBSymbolFunc>(uid);
  if (!pdb_func_up)
    return 0;
  Block &parent_block = func.GetBlock(false);
  num_added = ParseFunctionBlocksForPDBSymbol(
      pdb_func_up->getVirtualAddress(), pdb_func_up.get(), &parent_block, true);
  return num_added;
}

size_t SymbolFilePDB::ParseTypes(CompileUnit &comp_unit) {
  std::lock_guard<std::recursive_mutex> guard(GetModuleMutex());

  size_t num_added = 0;
  auto compiland = GetPDBCompilandByUID(comp_unit.GetID());
  if (!compiland)
    return 0;

  auto ParseTypesByTagFn = [&num_added, this](const PDBSymbol &raw_sym) {
    std::unique_ptr<IPDBEnumSymbols> results;
    PDB_SymType tags_to_search[] = {PDB_SymType::Enum, PDB_SymType::Typedef,
                                    PDB_SymType::UDT};
    for (auto tag : tags_to_search) {
      results = raw_sym.findAllChildren(tag);
      if (!results || results->getChildCount() == 0)
        continue;
      while (auto symbol = results->getNext()) {
        switch (symbol->getSymTag()) {
        case PDB_SymType::Enum:
        case PDB_SymType::UDT:
        case PDB_SymType::Typedef:
          break;
        default:
          continue;
        }

        // This should cause the type to get cached and stored in the `m_types`
        // lookup.
        if (auto type = ResolveTypeUID(symbol->getSymIndexId())) {
          // Resolve the type completely to avoid a completion
          // (and so a list change, which causes an iterators invalidation)
          // during a TypeList dumping
          type->GetFullCompilerType();
          ++num_added;
        }
      }
    }
  };

  ParseTypesByTagFn(*compiland);

  // Also parse global types particularly coming from this compiland.
  // Unfortunately, PDB has no compiland information for each global type. We
  // have to parse them all. But ensure we only do this once.
  static bool parse_all_global_types = false;
  if (!parse_all_global_types) {
    ParseTypesByTagFn(*m_global_scope_up);
    parse_all_global_types = true;
  }
  return num_added;
}

size_t
SymbolFilePDB::ParseVariablesForContext(const lldb_private::SymbolContext &sc) {
  std::lock_guard<std::recursive_mutex> guard(GetModuleMutex());
  if (!sc.comp_unit)
    return 0;

  size_t num_added = 0;
  if (sc.function) {
    auto pdb_func = m_session_up->getConcreteSymbolById<PDBSymbolFunc>(
        sc.function->GetID());
    if (!pdb_func)
      return 0;

    num_added += ParseVariables(sc, *pdb_func);
    sc.function->GetBlock(false).SetDidParseVariables(true, true);
  } else if (sc.comp_unit) {
    auto compiland = GetPDBCompilandByUID(sc.comp_unit->GetID());
    if (!compiland)
      return 0;

    if (sc.comp_unit->GetVariableList(false))
      return 0;

    auto results = m_global_scope_up->findAllChildren<PDBSymbolData>();
    if (results && results->getChildCount()) {
      while (auto result = results->getNext()) {
        auto cu_id = GetCompilandId(*result);
        // FIXME: We are not able to determine variable's compile unit.
        if (cu_id == 0)
          continue;

        if (cu_id == sc.comp_unit->GetID())
          num_added += ParseVariables(sc, *result);
      }
    }

    // FIXME: A `file static` or `global constant` variable appears both in
    // compiland's children and global scope's children with unexpectedly
    // different symbol's Id making it ambiguous.

    // FIXME: 'local constant', for example, const char var[] = "abc", declared
    // in a function scope, can't be found in PDB.

    // Parse variables in this compiland.
    num_added += ParseVariables(sc, *compiland);
  }

  return num_added;
}

lldb_private::Type *SymbolFilePDB::ResolveTypeUID(lldb::user_id_t type_uid) {
  std::lock_guard<std::recursive_mutex> guard(GetModuleMutex());
  auto find_result = m_types.find(type_uid);
  if (find_result != m_types.end())
    return find_result->second.get();

  auto type_system_or_err =
      GetTypeSystemForLanguage(lldb::eLanguageTypeC_plus_plus);
  if (auto err = type_system_or_err.takeError()) {
    LLDB_LOG_ERROR(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_SYMBOLS),
                   std::move(err), "Unable to ResolveTypeUID");
    return nullptr;
  }

  ClangASTContext *clang_type_system =
      llvm::dyn_cast_or_null<ClangASTContext>(&type_system_or_err.get());
  if (!clang_type_system)
    return nullptr;
  PDBASTParser *pdb = clang_type_system->GetPDBParser();
  if (!pdb)
    return nullptr;

  auto pdb_type = m_session_up->getSymbolById(type_uid);
  if (pdb_type == nullptr)
    return nullptr;

  lldb::TypeSP result = pdb->CreateLLDBTypeFromPDBType(*pdb_type);
  if (result) {
    m_types.insert(std::make_pair(type_uid, result));
    GetTypeList().Insert(result);
  }
  return result.get();
}

llvm::Optional<SymbolFile::ArrayInfo> SymbolFilePDB::GetDynamicArrayInfoForUID(
    lldb::user_id_t type_uid, const lldb_private::ExecutionContext *exe_ctx) {
  return llvm::None;
}

bool SymbolFilePDB::CompleteType(lldb_private::CompilerType &compiler_type) {
  std::lock_guard<std::recursive_mutex> guard(
      GetObjectFile()->GetModule()->GetMutex());

  auto type_system_or_err =
      GetTypeSystemForLanguage(lldb::eLanguageTypeC_plus_plus);
  if (auto err = type_system_or_err.takeError()) {
    LLDB_LOG_ERROR(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_SYMBOLS),
                   std::move(err), "Unable to get dynamic array info for UID");
    return false;
  }

  ClangASTContext *clang_ast_ctx =
      llvm::dyn_cast_or_null<ClangASTContext>(&type_system_or_err.get());

  if (!clang_ast_ctx)
    return false;

  PDBASTParser *pdb = clang_ast_ctx->GetPDBParser();
  if (!pdb)
    return false;

  return pdb->CompleteTypeFromPDB(compiler_type);
}

lldb_private::CompilerDecl SymbolFilePDB::GetDeclForUID(lldb::user_id_t uid) {
  auto type_system_or_err =
      GetTypeSystemForLanguage(lldb::eLanguageTypeC_plus_plus);
  if (auto err = type_system_or_err.takeError()) {
    LLDB_LOG_ERROR(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_SYMBOLS),
                   std::move(err), "Unable to get decl for UID");
    return CompilerDecl();
  }

  ClangASTContext *clang_ast_ctx =
      llvm::dyn_cast_or_null<ClangASTContext>(&type_system_or_err.get());
  if (!clang_ast_ctx)
    return CompilerDecl();

  PDBASTParser *pdb = clang_ast_ctx->GetPDBParser();
  if (!pdb)
    return CompilerDecl();

  auto symbol = m_session_up->getSymbolById(uid);
  if (!symbol)
    return CompilerDecl();

  auto decl = pdb->GetDeclForSymbol(*symbol);
  if (!decl)
    return CompilerDecl();

  return CompilerDecl(clang_ast_ctx, decl);
}

lldb_private::CompilerDeclContext
SymbolFilePDB::GetDeclContextForUID(lldb::user_id_t uid) {
  auto type_system_or_err =
      GetTypeSystemForLanguage(lldb::eLanguageTypeC_plus_plus);
  if (auto err = type_system_or_err.takeError()) {
    LLDB_LOG_ERROR(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_SYMBOLS),
                   std::move(err), "Unable to get DeclContext for UID");
    return CompilerDeclContext();
  }

  ClangASTContext *clang_ast_ctx =
      llvm::dyn_cast_or_null<ClangASTContext>(&type_system_or_err.get());
  if (!clang_ast_ctx)
    return CompilerDeclContext();

  PDBASTParser *pdb = clang_ast_ctx->GetPDBParser();
  if (!pdb)
    return CompilerDeclContext();

  auto symbol = m_session_up->getSymbolById(uid);
  if (!symbol)
    return CompilerDeclContext();

  auto decl_context = pdb->GetDeclContextForSymbol(*symbol);
  if (!decl_context)
    return GetDeclContextContainingUID(uid);

  return CompilerDeclContext(clang_ast_ctx, decl_context);
}

lldb_private::CompilerDeclContext
SymbolFilePDB::GetDeclContextContainingUID(lldb::user_id_t uid) {
  auto type_system_or_err =
      GetTypeSystemForLanguage(lldb::eLanguageTypeC_plus_plus);
  if (auto err = type_system_or_err.takeError()) {
    LLDB_LOG_ERROR(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_SYMBOLS),
                   std::move(err), "Unable to get DeclContext containing UID");
    return CompilerDeclContext();
  }

  ClangASTContext *clang_ast_ctx =
      llvm::dyn_cast_or_null<ClangASTContext>(&type_system_or_err.get());
  if (!clang_ast_ctx)
    return CompilerDeclContext();

  PDBASTParser *pdb = clang_ast_ctx->GetPDBParser();
  if (!pdb)
    return CompilerDeclContext();

  auto symbol = m_session_up->getSymbolById(uid);
  if (!symbol)
    return CompilerDeclContext();

  auto decl_context = pdb->GetDeclContextContainingSymbol(*symbol);
  assert(decl_context);

  return CompilerDeclContext(clang_ast_ctx, decl_context);
}

void SymbolFilePDB::ParseDeclsForContext(
    lldb_private::CompilerDeclContext decl_ctx) {
  auto type_system_or_err =
      GetTypeSystemForLanguage(lldb::eLanguageTypeC_plus_plus);
  if (auto err = type_system_or_err.takeError()) {
    LLDB_LOG_ERROR(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_SYMBOLS),
                   std::move(err), "Unable to parse decls for context");
    return;
  }

  ClangASTContext *clang_ast_ctx =
      llvm::dyn_cast_or_null<ClangASTContext>(&type_system_or_err.get());
  if (!clang_ast_ctx)
    return;

  PDBASTParser *pdb = clang_ast_ctx->GetPDBParser();
  if (!pdb)
    return;

  pdb->ParseDeclsForDeclContext(
      static_cast<clang::DeclContext *>(decl_ctx.GetOpaqueDeclContext()));
}

uint32_t
SymbolFilePDB::ResolveSymbolContext(const lldb_private::Address &so_addr,
                                    SymbolContextItem resolve_scope,
                                    lldb_private::SymbolContext &sc) {
  std::lock_guard<std::recursive_mutex> guard(GetModuleMutex());
  uint32_t resolved_flags = 0;
  if (resolve_scope & eSymbolContextCompUnit ||
      resolve_scope & eSymbolContextVariable ||
      resolve_scope & eSymbolContextFunction ||
      resolve_scope & eSymbolContextBlock ||
      resolve_scope & eSymbolContextLineEntry) {
    auto cu_sp = GetCompileUnitContainsAddress(so_addr);
    if (!cu_sp) {
      if (resolved_flags & eSymbolContextVariable) {
        // TODO: Resolve variables
      }
      return 0;
    }
    sc.comp_unit = cu_sp.get();
    resolved_flags |= eSymbolContextCompUnit;
    lldbassert(sc.module_sp == cu_sp->GetModule());
  }

  if (resolve_scope & eSymbolContextFunction ||
      resolve_scope & eSymbolContextBlock) {
    addr_t file_vm_addr = so_addr.GetFileAddress();
    auto symbol_up =
        m_session_up->findSymbolByAddress(file_vm_addr, PDB_SymType::Function);
    if (symbol_up) {
      auto *pdb_func = llvm::dyn_cast<PDBSymbolFunc>(symbol_up.get());
      assert(pdb_func);
      auto func_uid = pdb_func->getSymIndexId();
      sc.function = sc.comp_unit->FindFunctionByUID(func_uid).get();
      if (sc.function == nullptr)
        sc.function =
            ParseCompileUnitFunctionForPDBFunc(*pdb_func, *sc.comp_unit);
      if (sc.function) {
        resolved_flags |= eSymbolContextFunction;
        if (resolve_scope & eSymbolContextBlock) {
          auto block_symbol = m_session_up->findSymbolByAddress(
              file_vm_addr, PDB_SymType::Block);
          auto block_id = block_symbol ? block_symbol->getSymIndexId()
                                       : sc.function->GetID();
          sc.block = sc.function->GetBlock(true).FindBlockByID(block_id);
          if (sc.block)
            resolved_flags |= eSymbolContextBlock;
        }
      }
    }
  }

  if (resolve_scope & eSymbolContextLineEntry) {
    if (auto *line_table = sc.comp_unit->GetLineTable()) {
      Address addr(so_addr);
      if (line_table->FindLineEntryByAddress(addr, sc.line_entry))
        resolved_flags |= eSymbolContextLineEntry;
    }
  }

  return resolved_flags;
}

uint32_t SymbolFilePDB::ResolveSymbolContext(
    const lldb_private::FileSpec &file_spec, uint32_t line, bool check_inlines,
    SymbolContextItem resolve_scope, lldb_private::SymbolContextList &sc_list) {
  std::lock_guard<std::recursive_mutex> guard(GetModuleMutex());
  const size_t old_size = sc_list.GetSize();
  if (resolve_scope & lldb::eSymbolContextCompUnit) {
    // Locate all compilation units with line numbers referencing the specified
    // file.  For example, if `file_spec` is <vector>, then this should return
    // all source files and header files that reference <vector>, either
    // directly or indirectly.
    auto compilands = m_session_up->findCompilandsForSourceFile(
        file_spec.GetPath(), PDB_NameSearchFlags::NS_CaseInsensitive);

    if (!compilands)
      return 0;

    // For each one, either find its previously parsed data or parse it afresh
    // and add it to the symbol context list.
    while (auto compiland = compilands->getNext()) {
      // If we're not checking inlines, then don't add line information for
      // this file unless the FileSpec matches. For inline functions, we don't
      // have to match the FileSpec since they could be defined in headers
      // other than file specified in FileSpec.
      if (!check_inlines) {
        std::string source_file = compiland->getSourceFileFullPath();
        if (source_file.empty())
          continue;
        FileSpec this_spec(source_file, FileSpec::Style::windows);
        bool need_full_match = !file_spec.GetDirectory().IsEmpty();
        if (FileSpec::Compare(file_spec, this_spec, need_full_match) != 0)
          continue;
      }

      SymbolContext sc;
      auto cu = ParseCompileUnitForUID(compiland->getSymIndexId());
      if (!cu)
        continue;
      sc.comp_unit = cu.get();
      sc.module_sp = cu->GetModule();

      // If we were asked to resolve line entries, add all entries to the line
      // table that match the requested line (or all lines if `line` == 0).
      if (resolve_scope & (eSymbolContextFunction | eSymbolContextBlock |
                           eSymbolContextLineEntry)) {
        bool has_line_table = ParseCompileUnitLineTable(*sc.comp_unit, line);

        if ((resolve_scope & eSymbolContextLineEntry) && !has_line_table) {
          // The query asks for line entries, but we can't get them for the
          // compile unit. This is not normal for `line` = 0. So just assert
          // it.
          assert(line && "Couldn't get all line entries!\n");

          // Current compiland does not have the requested line. Search next.
          continue;
        }

        if (resolve_scope & (eSymbolContextFunction | eSymbolContextBlock)) {
          if (!has_line_table)
            continue;

          auto *line_table = sc.comp_unit->GetLineTable();
          lldbassert(line_table);

          uint32_t num_line_entries = line_table->GetSize();
          // Skip the terminal line entry.
          --num_line_entries;

          // If `line `!= 0, see if we can resolve function for each line entry
          // in the line table.
          for (uint32_t line_idx = 0; line && line_idx < num_line_entries;
               ++line_idx) {
            if (!line_table->GetLineEntryAtIndex(line_idx, sc.line_entry))
              continue;

            auto file_vm_addr =
                sc.line_entry.range.GetBaseAddress().GetFileAddress();
            if (file_vm_addr == LLDB_INVALID_ADDRESS || file_vm_addr == 0)
              continue;

            auto symbol_up = m_session_up->findSymbolByAddress(
                file_vm_addr, PDB_SymType::Function);
            if (symbol_up) {
              auto func_uid = symbol_up->getSymIndexId();
              sc.function = sc.comp_unit->FindFunctionByUID(func_uid).get();
              if (sc.function == nullptr) {
                auto pdb_func = llvm::dyn_cast<PDBSymbolFunc>(symbol_up.get());
                assert(pdb_func);
                sc.function = ParseCompileUnitFunctionForPDBFunc(*pdb_func,
                                                                 *sc.comp_unit);
              }
              if (sc.function && (resolve_scope & eSymbolContextBlock)) {
                Block &block = sc.function->GetBlock(true);
                sc.block = block.FindBlockByID(sc.function->GetID());
              }
            }
            sc_list.Append(sc);
          }
        } else if (has_line_table) {
          // We can parse line table for the compile unit. But no query to
          // resolve function or block. We append `sc` to the list anyway.
          sc_list.Append(sc);
        }
      } else {
        // No query for line entry, function or block. But we have a valid
        // compile unit, append `sc` to the list.
        sc_list.Append(sc);
      }
    }
  }
  return sc_list.GetSize() - old_size;
}

std::string SymbolFilePDB::GetMangledForPDBData(const PDBSymbolData &pdb_data) {
  // Cache public names at first
  if (m_public_names.empty())
    if (auto result_up =
            m_global_scope_up->findAllChildren(PDB_SymType::PublicSymbol))
      while (auto symbol_up = result_up->getNext())
        if (auto addr = symbol_up->getRawSymbol().getVirtualAddress())
          m_public_names[addr] = symbol_up->getRawSymbol().getName();

  // Look up the name in the cache
  return m_public_names.lookup(pdb_data.getVirtualAddress());
}

VariableSP SymbolFilePDB::ParseVariableForPDBData(
    const lldb_private::SymbolContext &sc,
    const llvm::pdb::PDBSymbolData &pdb_data) {
  VariableSP var_sp;
  uint32_t var_uid = pdb_data.getSymIndexId();
  auto result = m_variables.find(var_uid);
  if (result != m_variables.end())
    return result->second;

  ValueType scope = eValueTypeInvalid;
  bool is_static_member = false;
  bool is_external = false;
  bool is_artificial = false;

  switch (pdb_data.getDataKind()) {
  case PDB_DataKind::Global:
    scope = eValueTypeVariableGlobal;
    is_external = true;
    break;
  case PDB_DataKind::Local:
    scope = eValueTypeVariableLocal;
    break;
  case PDB_DataKind::FileStatic:
    scope = eValueTypeVariableStatic;
    break;
  case PDB_DataKind::StaticMember:
    is_static_member = true;
    scope = eValueTypeVariableStatic;
    break;
  case PDB_DataKind::Member:
    scope = eValueTypeVariableStatic;
    break;
  case PDB_DataKind::Param:
    scope = eValueTypeVariableArgument;
    break;
  case PDB_DataKind::Constant:
    scope = eValueTypeConstResult;
    break;
  default:
    break;
  }

  switch (pdb_data.getLocationType()) {
  case PDB_LocType::TLS:
    scope = eValueTypeVariableThreadLocal;
    break;
  case PDB_LocType::RegRel: {
    // It is a `this` pointer.
    if (pdb_data.getDataKind() == PDB_DataKind::ObjectPtr) {
      scope = eValueTypeVariableArgument;
      is_artificial = true;
    }
  } break;
  default:
    break;
  }

  Declaration decl;
  if (!is_artificial && !pdb_data.isCompilerGenerated()) {
    if (auto lines = pdb_data.getLineNumbers()) {
      if (auto first_line = lines->getNext()) {
        uint32_t src_file_id = first_line->getSourceFileId();
        auto src_file = m_session_up->getSourceFileById(src_file_id);
        if (src_file) {
          FileSpec spec(src_file->getFileName());
          decl.SetFile(spec);
          decl.SetColumn(first_line->getColumnNumber());
          decl.SetLine(first_line->getLineNumber());
        }
      }
    }
  }

  Variable::RangeList ranges;
  SymbolContextScope *context_scope = sc.comp_unit;
  if (scope == eValueTypeVariableLocal || scope == eValueTypeVariableArgument) {
    if (sc.function) {
      Block &function_block = sc.function->GetBlock(true);
      Block *block =
          function_block.FindBlockByID(pdb_data.getLexicalParentId());
      if (!block)
        block = &function_block;

      context_scope = block;

      for (size_t i = 0, num_ranges = block->GetNumRanges(); i < num_ranges;
           ++i) {
        AddressRange range;
        if (!block->GetRangeAtIndex(i, range))
          continue;

        ranges.Append(range.GetBaseAddress().GetFileAddress(),
                      range.GetByteSize());
      }
    }
  }

  SymbolFileTypeSP type_sp =
      std::make_shared<SymbolFileType>(*this, pdb_data.getTypeId());

  auto var_name = pdb_data.getName();
  auto mangled = GetMangledForPDBData(pdb_data);
  auto mangled_cstr = mangled.empty() ? nullptr : mangled.c_str();

  bool is_constant;
  DWARFExpression location = ConvertPDBLocationToDWARFExpression(
      GetObjectFile()->GetModule(), pdb_data, ranges, is_constant);

  var_sp = std::make_shared<Variable>(
      var_uid, var_name.c_str(), mangled_cstr, type_sp, scope, context_scope,
      ranges, &decl, location, is_external, is_artificial, is_static_member);
  var_sp->SetLocationIsConstantValueData(is_constant);

  m_variables.insert(std::make_pair(var_uid, var_sp));
  return var_sp;
}

size_t
SymbolFilePDB::ParseVariables(const lldb_private::SymbolContext &sc,
                              const llvm::pdb::PDBSymbol &pdb_symbol,
                              lldb_private::VariableList *variable_list) {
  size_t num_added = 0;

  if (auto pdb_data = llvm::dyn_cast<PDBSymbolData>(&pdb_symbol)) {
    VariableListSP local_variable_list_sp;

    auto result = m_variables.find(pdb_data->getSymIndexId());
    if (result != m_variables.end()) {
      if (variable_list)
        variable_list->AddVariableIfUnique(result->second);
    } else {
      // Prepare right VariableList for this variable.
      if (auto lexical_parent = pdb_data->getLexicalParent()) {
        switch (lexical_parent->getSymTag()) {
        case PDB_SymType::Exe:
          assert(sc.comp_unit);
          LLVM_FALLTHROUGH;
        case PDB_SymType::Compiland: {
          if (sc.comp_unit) {
            local_variable_list_sp = sc.comp_unit->GetVariableList(false);
            if (!local_variable_list_sp) {
              local_variable_list_sp = std::make_shared<VariableList>();
              sc.comp_unit->SetVariableList(local_variable_list_sp);
            }
          }
        } break;
        case PDB_SymType::Block:
        case PDB_SymType::Function: {
          if (sc.function) {
            Block *block = sc.function->GetBlock(true).FindBlockByID(
                lexical_parent->getSymIndexId());
            if (block) {
              local_variable_list_sp = block->GetBlockVariableList(false);
              if (!local_variable_list_sp) {
                local_variable_list_sp = std::make_shared<VariableList>();
                block->SetVariableList(local_variable_list_sp);
              }
            }
          }
        } break;
        default:
          break;
        }
      }

      if (local_variable_list_sp) {
        if (auto var_sp = ParseVariableForPDBData(sc, *pdb_data)) {
          local_variable_list_sp->AddVariableIfUnique(var_sp);
          if (variable_list)
            variable_list->AddVariableIfUnique(var_sp);
          ++num_added;
          PDBASTParser *ast = GetPDBAstParser();
          if (ast)
            ast->GetDeclForSymbol(*pdb_data);
        }
      }
    }
  }

  if (auto results = pdb_symbol.findAllChildren()) {
    while (auto result = results->getNext())
      num_added += ParseVariables(sc, *result, variable_list);
  }

  return num_added;
}

void SymbolFilePDB::FindGlobalVariables(
    lldb_private::ConstString name,
    const lldb_private::CompilerDeclContext *parent_decl_ctx,
    uint32_t max_matches, lldb_private::VariableList &variables) {
  std::lock_guard<std::recursive_mutex> guard(GetModuleMutex());
  if (!DeclContextMatchesThisSymbolFile(parent_decl_ctx))
    return;
  if (name.IsEmpty())
    return;

  auto results = m_global_scope_up->findAllChildren<PDBSymbolData>();
  if (!results)
    return;

  uint32_t matches = 0;
  size_t old_size = variables.GetSize();
  while (auto result = results->getNext()) {
    auto pdb_data = llvm::dyn_cast<PDBSymbolData>(result.get());
    if (max_matches > 0 && matches >= max_matches)
      break;

    SymbolContext sc;
    sc.module_sp = m_objfile_sp->GetModule();
    lldbassert(sc.module_sp.get());

    if (!name.GetStringRef().equals(
            MSVCUndecoratedNameParser::DropScope(pdb_data->getName())))
      continue;

    sc.comp_unit = ParseCompileUnitForUID(GetCompilandId(*pdb_data)).get();
    // FIXME: We are not able to determine the compile unit.
    if (sc.comp_unit == nullptr)
      continue;

    if (parent_decl_ctx && GetDeclContextContainingUID(
                               result->getSymIndexId()) != *parent_decl_ctx)
      continue;

    ParseVariables(sc, *pdb_data, &variables);
    matches = variables.GetSize() - old_size;
  }
}

void SymbolFilePDB::FindGlobalVariables(
    const lldb_private::RegularExpression &regex, uint32_t max_matches,
    lldb_private::VariableList &variables) {
  std::lock_guard<std::recursive_mutex> guard(GetModuleMutex());
  if (!regex.IsValid())
    return;
  auto results = m_global_scope_up->findAllChildren<PDBSymbolData>();
  if (!results)
    return;

  uint32_t matches = 0;
  size_t old_size = variables.GetSize();
  while (auto pdb_data = results->getNext()) {
    if (max_matches > 0 && matches >= max_matches)
      break;

    auto var_name = pdb_data->getName();
    if (var_name.empty())
      continue;
    if (!regex.Execute(var_name))
      continue;
    SymbolContext sc;
    sc.module_sp = m_objfile_sp->GetModule();
    lldbassert(sc.module_sp.get());

    sc.comp_unit = ParseCompileUnitForUID(GetCompilandId(*pdb_data)).get();
    // FIXME: We are not able to determine the compile unit.
    if (sc.comp_unit == nullptr)
      continue;

    ParseVariables(sc, *pdb_data, &variables);
    matches = variables.GetSize() - old_size;
  }
}

bool SymbolFilePDB::ResolveFunction(const llvm::pdb::PDBSymbolFunc &pdb_func,
                                    bool include_inlines,
                                    lldb_private::SymbolContextList &sc_list) {
  lldb_private::SymbolContext sc;
  sc.comp_unit = ParseCompileUnitForUID(pdb_func.getCompilandId()).get();
  if (!sc.comp_unit)
    return false;
  sc.module_sp = sc.comp_unit->GetModule();
  sc.function = ParseCompileUnitFunctionForPDBFunc(pdb_func, *sc.comp_unit);
  if (!sc.function)
    return false;

  sc_list.Append(sc);
  return true;
}

bool SymbolFilePDB::ResolveFunction(uint32_t uid, bool include_inlines,
                                    lldb_private::SymbolContextList &sc_list) {
  auto pdb_func_up = m_session_up->getConcreteSymbolById<PDBSymbolFunc>(uid);
  if (!pdb_func_up && !(include_inlines && pdb_func_up->hasInlineAttribute()))
    return false;
  return ResolveFunction(*pdb_func_up, include_inlines, sc_list);
}

void SymbolFilePDB::CacheFunctionNames() {
  if (!m_func_full_names.IsEmpty())
    return;

  std::map<uint64_t, uint32_t> addr_ids;

  if (auto results_up = m_global_scope_up->findAllChildren<PDBSymbolFunc>()) {
    while (auto pdb_func_up = results_up->getNext()) {
      if (pdb_func_up->isCompilerGenerated())
        continue;

      auto name = pdb_func_up->getName();
      auto demangled_name = pdb_func_up->getUndecoratedName();
      if (name.empty() && demangled_name.empty())
        continue;

      auto uid = pdb_func_up->getSymIndexId();
      if (!demangled_name.empty() && pdb_func_up->getVirtualAddress())
        addr_ids.insert(std::make_pair(pdb_func_up->getVirtualAddress(), uid));

      if (auto parent = pdb_func_up->getClassParent()) {

        // PDB have symbols for class/struct methods or static methods in Enum
        // Class. We won't bother to check if the parent is UDT or Enum here.
        m_func_method_names.Append(ConstString(name), uid);

        // To search a method name, like NS::Class:MemberFunc, LLDB searches
        // its base name, i.e. MemberFunc by default. Since PDBSymbolFunc does
        // not have inforamtion of this, we extract base names and cache them
        // by our own effort.
        llvm::StringRef basename = MSVCUndecoratedNameParser::DropScope(name);
        if (!basename.empty())
          m_func_base_names.Append(ConstString(basename), uid);
        else {
          m_func_base_names.Append(ConstString(name), uid);
        }

        if (!demangled_name.empty())
          m_func_full_names.Append(ConstString(demangled_name), uid);

      } else {
        // Handle not-method symbols.

        // The function name might contain namespace, or its lexical scope.
        llvm::StringRef basename = MSVCUndecoratedNameParser::DropScope(name);
        if (!basename.empty())
          m_func_base_names.Append(ConstString(basename), uid);
        else
          m_func_base_names.Append(ConstString(name), uid);

        if (name == "main") {
          m_func_full_names.Append(ConstString(name), uid);

          if (!demangled_name.empty() && name != demangled_name) {
            m_func_full_names.Append(ConstString(demangled_name), uid);
            m_func_base_names.Append(ConstString(demangled_name), uid);
          }
        } else if (!demangled_name.empty()) {
          m_func_full_names.Append(ConstString(demangled_name), uid);
        } else {
          m_func_full_names.Append(ConstString(name), uid);
        }
      }
    }
  }

  if (auto results_up =
          m_global_scope_up->findAllChildren<PDBSymbolPublicSymbol>()) {
    while (auto pub_sym_up = results_up->getNext()) {
      if (!pub_sym_up->isFunction())
        continue;
      auto name = pub_sym_up->getName();
      if (name.empty())
        continue;

      if (CPlusPlusLanguage::IsCPPMangledName(name.c_str())) {
        auto vm_addr = pub_sym_up->getVirtualAddress();

        // PDB public symbol has mangled name for its associated function.
        if (vm_addr && addr_ids.find(vm_addr) != addr_ids.end()) {
          // Cache mangled name.
          m_func_full_names.Append(ConstString(name), addr_ids[vm_addr]);
        }
      }
    }
  }
  // Sort them before value searching is working properly
  m_func_full_names.Sort();
  m_func_full_names.SizeToFit();
  m_func_method_names.Sort();
  m_func_method_names.SizeToFit();
  m_func_base_names.Sort();
  m_func_base_names.SizeToFit();
}

void SymbolFilePDB::FindFunctions(
    lldb_private::ConstString name,
    const lldb_private::CompilerDeclContext *parent_decl_ctx,
    FunctionNameType name_type_mask, bool include_inlines,
    lldb_private::SymbolContextList &sc_list) {
  std::lock_guard<std::recursive_mutex> guard(GetModuleMutex());
  lldbassert((name_type_mask & eFunctionNameTypeAuto) == 0);

  if (name_type_mask == eFunctionNameTypeNone)
    return;
  if (!DeclContextMatchesThisSymbolFile(parent_decl_ctx))
    return;
  if (name.IsEmpty())
    return;

  if (name_type_mask & eFunctionNameTypeFull ||
      name_type_mask & eFunctionNameTypeBase ||
      name_type_mask & eFunctionNameTypeMethod) {
    CacheFunctionNames();

    std::set<uint32_t> resolved_ids;
    auto ResolveFn = [this, &name, parent_decl_ctx, include_inlines, &sc_list,
                      &resolved_ids](UniqueCStringMap<uint32_t> &Names) {
      std::vector<uint32_t> ids;
      if (!Names.GetValues(name, ids))
        return;

      for (uint32_t id : ids) {
        if (resolved_ids.find(id) != resolved_ids.end())
          continue;

        if (parent_decl_ctx &&
            GetDeclContextContainingUID(id) != *parent_decl_ctx)
          continue;

        if (ResolveFunction(id, include_inlines, sc_list))
          resolved_ids.insert(id);
      }
    };
    if (name_type_mask & eFunctionNameTypeFull) {
      ResolveFn(m_func_full_names);
      ResolveFn(m_func_base_names);
      ResolveFn(m_func_method_names);
    }
    if (name_type_mask & eFunctionNameTypeBase)
      ResolveFn(m_func_base_names);
    if (name_type_mask & eFunctionNameTypeMethod)
      ResolveFn(m_func_method_names);
  }
}

void SymbolFilePDB::FindFunctions(const lldb_private::RegularExpression &regex,
                                  bool include_inlines,
                                  lldb_private::SymbolContextList &sc_list) {
  std::lock_guard<std::recursive_mutex> guard(GetModuleMutex());
  if (!regex.IsValid())
    return;

  CacheFunctionNames();

  std::set<uint32_t> resolved_ids;
  auto ResolveFn = [&regex, include_inlines, &sc_list, &resolved_ids,
                    this](UniqueCStringMap<uint32_t> &Names) {
    std::vector<uint32_t> ids;
    if (Names.GetValues(regex, ids)) {
      for (auto id : ids) {
        if (resolved_ids.find(id) == resolved_ids.end())
          if (ResolveFunction(id, include_inlines, sc_list))
            resolved_ids.insert(id);
      }
    }
  };
  ResolveFn(m_func_full_names);
  ResolveFn(m_func_base_names);
}

void SymbolFilePDB::GetMangledNamesForFunction(
    const std::string &scope_qualified_name,
    std::vector<lldb_private::ConstString> &mangled_names) {}

void SymbolFilePDB::AddSymbols(lldb_private::Symtab &symtab) {
  std::set<lldb::addr_t> sym_addresses;
  for (size_t i = 0; i < symtab.GetNumSymbols(); i++)
    sym_addresses.insert(symtab.SymbolAtIndex(i)->GetFileAddress());

  auto results = m_global_scope_up->findAllChildren<PDBSymbolPublicSymbol>();
  if (!results)
    return;

  auto section_list = m_objfile_sp->GetSectionList();
  if (!section_list)
    return;

  while (auto pub_symbol = results->getNext()) {
    auto section_id = pub_symbol->getAddressSection();

    auto section = section_list->FindSectionByID(section_id);
    if (!section)
      continue;

    auto offset = pub_symbol->getAddressOffset();

    auto file_addr = section->GetFileAddress() + offset;
    if (sym_addresses.find(file_addr) != sym_addresses.end())
      continue;
    sym_addresses.insert(file_addr);

    auto size = pub_symbol->getLength();
    symtab.AddSymbol(
        Symbol(pub_symbol->getSymIndexId(),   // symID
               pub_symbol->getName().c_str(), // name
               pub_symbol->isCode() ? eSymbolTypeCode : eSymbolTypeData, // type
               true,      // external
               false,     // is_debug
               false,     // is_trampoline
               false,     // is_artificial
               section,   // section_sp
               offset,    // value
               size,      // size
               size != 0, // size_is_valid
               false,     // contains_linker_annotations
               0          // flags
               ));
  }

  symtab.CalculateSymbolSizes();
  symtab.Finalize();
}

void SymbolFilePDB::FindTypes(
    lldb_private::ConstString name,
    const lldb_private::CompilerDeclContext *parent_decl_ctx,
    uint32_t max_matches,
    llvm::DenseSet<lldb_private::SymbolFile *> &searched_symbol_files,
    lldb_private::TypeMap &types) {
  std::lock_guard<std::recursive_mutex> guard(GetModuleMutex());
  if (!name)
    return;
  if (!DeclContextMatchesThisSymbolFile(parent_decl_ctx))
    return;

  searched_symbol_files.clear();
  searched_symbol_files.insert(this);

  // There is an assumption 'name' is not a regex
  FindTypesByName(name.GetStringRef(), parent_decl_ctx, max_matches, types);
}

void SymbolFilePDB::DumpClangAST(Stream &s) {
  auto type_system_or_err =
      GetTypeSystemForLanguage(lldb::eLanguageTypeC_plus_plus);
  if (auto err = type_system_or_err.takeError()) {
    LLDB_LOG_ERROR(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_SYMBOLS),
                   std::move(err), "Unable to dump ClangAST");
    return;
  }

  auto *clang_type_system =
      llvm::dyn_cast_or_null<ClangASTContext>(&type_system_or_err.get());
  if (!clang_type_system)
    return;
  clang_type_system->Dump(s);
}

void SymbolFilePDB::FindTypesByRegex(
    const lldb_private::RegularExpression &regex, uint32_t max_matches,
    lldb_private::TypeMap &types) {
  // When searching by regex, we need to go out of our way to limit the search
  // space as much as possible since this searches EVERYTHING in the PDB,
  // manually doing regex comparisons.  PDB library isn't optimized for regex
  // searches or searches across multiple symbol types at the same time, so the
  // best we can do is to search enums, then typedefs, then classes one by one,
  // and do a regex comparison against each of them.
  PDB_SymType tags_to_search[] = {PDB_SymType::Enum, PDB_SymType::Typedef,
                                  PDB_SymType::UDT};
  std::unique_ptr<IPDBEnumSymbols> results;

  uint32_t matches = 0;

  for (auto tag : tags_to_search) {
    results = m_global_scope_up->findAllChildren(tag);
    if (!results)
      continue;

    while (auto result = results->getNext()) {
      if (max_matches > 0 && matches >= max_matches)
        break;

      std::string type_name;
      if (auto enum_type = llvm::dyn_cast<PDBSymbolTypeEnum>(result.get()))
        type_name = enum_type->getName();
      else if (auto typedef_type =
                   llvm::dyn_cast<PDBSymbolTypeTypedef>(result.get()))
        type_name = typedef_type->getName();
      else if (auto class_type = llvm::dyn_cast<PDBSymbolTypeUDT>(result.get()))
        type_name = class_type->getName();
      else {
        // We're looking only for types that have names.  Skip symbols, as well
        // as unnamed types such as arrays, pointers, etc.
        continue;
      }

      if (!regex.Execute(type_name))
        continue;

      // This should cause the type to get cached and stored in the `m_types`
      // lookup.
      if (!ResolveTypeUID(result->getSymIndexId()))
        continue;

      auto iter = m_types.find(result->getSymIndexId());
      if (iter == m_types.end())
        continue;
      types.Insert(iter->second);
      ++matches;
    }
  }
}

void SymbolFilePDB::FindTypesByName(
    llvm::StringRef name,
    const lldb_private::CompilerDeclContext *parent_decl_ctx,
    uint32_t max_matches, lldb_private::TypeMap &types) {
  std::unique_ptr<IPDBEnumSymbols> results;
  if (name.empty())
    return;
  results = m_global_scope_up->findAllChildren(PDB_SymType::None);
  if (!results)
    return;

  uint32_t matches = 0;

  while (auto result = results->getNext()) {
    if (max_matches > 0 && matches >= max_matches)
      break;

    if (MSVCUndecoratedNameParser::DropScope(
            result->getRawSymbol().getName()) != name)
      continue;

    switch (result->getSymTag()) {
    case PDB_SymType::Enum:
    case PDB_SymType::UDT:
    case PDB_SymType::Typedef:
      break;
    default:
      // We're looking only for types that have names.  Skip symbols, as well
      // as unnamed types such as arrays, pointers, etc.
      continue;
    }

    // This should cause the type to get cached and stored in the `m_types`
    // lookup.
    if (!ResolveTypeUID(result->getSymIndexId()))
      continue;

    if (parent_decl_ctx && GetDeclContextContainingUID(
                               result->getSymIndexId()) != *parent_decl_ctx)
      continue;

    auto iter = m_types.find(result->getSymIndexId());
    if (iter == m_types.end())
      continue;
    types.Insert(iter->second);
    ++matches;
  }
}

void SymbolFilePDB::FindTypes(llvm::ArrayRef<CompilerContext> pattern,
                              LanguageSet languages,
                              lldb_private::TypeMap &types) {}

void SymbolFilePDB::GetTypesForPDBSymbol(const llvm::pdb::PDBSymbol &pdb_symbol,
                                         uint32_t type_mask,
                                         TypeCollection &type_collection) {
  bool can_parse = false;
  switch (pdb_symbol.getSymTag()) {
  case PDB_SymType::ArrayType:
    can_parse = ((type_mask & eTypeClassArray) != 0);
    break;
  case PDB_SymType::BuiltinType:
    can_parse = ((type_mask & eTypeClassBuiltin) != 0);
    break;
  case PDB_SymType::Enum:
    can_parse = ((type_mask & eTypeClassEnumeration) != 0);
    break;
  case PDB_SymType::Function:
  case PDB_SymType::FunctionSig:
    can_parse = ((type_mask & eTypeClassFunction) != 0);
    break;
  case PDB_SymType::PointerType:
    can_parse = ((type_mask & (eTypeClassPointer | eTypeClassBlockPointer |
                               eTypeClassMemberPointer)) != 0);
    break;
  case PDB_SymType::Typedef:
    can_parse = ((type_mask & eTypeClassTypedef) != 0);
    break;
  case PDB_SymType::UDT: {
    auto *udt = llvm::dyn_cast<PDBSymbolTypeUDT>(&pdb_symbol);
    assert(udt);
    can_parse = (udt->getUdtKind() != PDB_UdtType::Interface &&
                 ((type_mask & (eTypeClassClass | eTypeClassStruct |
                                eTypeClassUnion)) != 0));
  } break;
  default:
    break;
  }

  if (can_parse) {
    if (auto *type = ResolveTypeUID(pdb_symbol.getSymIndexId())) {
      auto result =
          std::find(type_collection.begin(), type_collection.end(), type);
      if (result == type_collection.end())
        type_collection.push_back(type);
    }
  }

  auto results_up = pdb_symbol.findAllChildren();
  while (auto symbol_up = results_up->getNext())
    GetTypesForPDBSymbol(*symbol_up, type_mask, type_collection);
}

void SymbolFilePDB::GetTypes(lldb_private::SymbolContextScope *sc_scope,
                             TypeClass type_mask,
                             lldb_private::TypeList &type_list) {
  std::lock_guard<std::recursive_mutex> guard(GetModuleMutex());
  TypeCollection type_collection;
  CompileUnit *cu =
      sc_scope ? sc_scope->CalculateSymbolContextCompileUnit() : nullptr;
  if (cu) {
    auto compiland_up = GetPDBCompilandByUID(cu->GetID());
    if (!compiland_up)
      return;
    GetTypesForPDBSymbol(*compiland_up, type_mask, type_collection);
  } else {
    for (uint32_t cu_idx = 0; cu_idx < GetNumCompileUnits(); ++cu_idx) {
      auto cu_sp = ParseCompileUnitAtIndex(cu_idx);
      if (cu_sp) {
        if (auto compiland_up = GetPDBCompilandByUID(cu_sp->GetID()))
          GetTypesForPDBSymbol(*compiland_up, type_mask, type_collection);
      }
    }
  }

  for (auto type : type_collection) {
    type->GetForwardCompilerType();
    type_list.Insert(type->shared_from_this());
  }
}

llvm::Expected<lldb_private::TypeSystem &>
SymbolFilePDB::GetTypeSystemForLanguage(lldb::LanguageType language) {
  auto type_system_or_err =
      m_objfile_sp->GetModule()->GetTypeSystemForLanguage(language);
  if (type_system_or_err) {
    type_system_or_err->SetSymbolFile(this);
  }
  return type_system_or_err;
}

PDBASTParser *SymbolFilePDB::GetPDBAstParser() {
  auto type_system_or_err =
      GetTypeSystemForLanguage(lldb::eLanguageTypeC_plus_plus);
  if (auto err = type_system_or_err.takeError()) {
    LLDB_LOG_ERROR(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_SYMBOLS),
                   std::move(err), "Unable to get PDB AST parser");
    return nullptr;
  }

  auto *clang_type_system =
      llvm::dyn_cast_or_null<ClangASTContext>(&type_system_or_err.get());
  if (!clang_type_system)
    return nullptr;

  return clang_type_system->GetPDBParser();
}


lldb_private::CompilerDeclContext SymbolFilePDB::FindNamespace(
    lldb_private::ConstString name,
    const lldb_private::CompilerDeclContext *parent_decl_ctx) {
  std::lock_guard<std::recursive_mutex> guard(GetModuleMutex());
  auto type_system_or_err =
      GetTypeSystemForLanguage(lldb::eLanguageTypeC_plus_plus);
  if (auto err = type_system_or_err.takeError()) {
    LLDB_LOG_ERROR(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_SYMBOLS),
                   std::move(err), "Unable to find namespace {}",
                   name.AsCString());
    return CompilerDeclContext();
  }

  auto *clang_type_system =
      llvm::dyn_cast_or_null<ClangASTContext>(&type_system_or_err.get());
  if (!clang_type_system)
    return CompilerDeclContext();

  PDBASTParser *pdb = clang_type_system->GetPDBParser();
  if (!pdb)
    return CompilerDeclContext();

  clang::DeclContext *decl_context = nullptr;
  if (parent_decl_ctx)
    decl_context = static_cast<clang::DeclContext *>(
        parent_decl_ctx->GetOpaqueDeclContext());

  auto namespace_decl =
      pdb->FindNamespaceDecl(decl_context, name.GetStringRef());
  if (!namespace_decl)
    return CompilerDeclContext();

  return CompilerDeclContext(clang_type_system,
                             static_cast<clang::DeclContext *>(namespace_decl));
}

lldb_private::ConstString SymbolFilePDB::GetPluginName() {
  static ConstString g_name("pdb");
  return g_name;
}

uint32_t SymbolFilePDB::GetPluginVersion() { return 1; }

IPDBSession &SymbolFilePDB::GetPDBSession() { return *m_session_up; }

const IPDBSession &SymbolFilePDB::GetPDBSession() const {
  return *m_session_up;
}

lldb::CompUnitSP SymbolFilePDB::ParseCompileUnitForUID(uint32_t id,
                                                       uint32_t index) {
  auto found_cu = m_comp_units.find(id);
  if (found_cu != m_comp_units.end())
    return found_cu->second;

  auto compiland_up = GetPDBCompilandByUID(id);
  if (!compiland_up)
    return CompUnitSP();

  lldb::LanguageType lang;
  auto details = compiland_up->findOneChild<PDBSymbolCompilandDetails>();
  if (!details)
    lang = lldb::eLanguageTypeC_plus_plus;
  else
    lang = TranslateLanguage(details->getLanguage());

  if (lang == lldb::LanguageType::eLanguageTypeUnknown)
    return CompUnitSP();

  std::string path = compiland_up->getSourceFileFullPath();
  if (path.empty())
    return CompUnitSP();

  // Don't support optimized code for now, DebugInfoPDB does not return this
  // information.
  LazyBool optimized = eLazyBoolNo;
  auto cu_sp = std::make_shared<CompileUnit>(m_objfile_sp->GetModule(), nullptr,
                                             path.c_str(), id, lang, optimized);

  if (!cu_sp)
    return CompUnitSP();

  m_comp_units.insert(std::make_pair(id, cu_sp));
  if (index == UINT32_MAX)
    GetCompileUnitIndex(*compiland_up, index);
  lldbassert(index != UINT32_MAX);
  SetCompileUnitAtIndex(index, cu_sp);
  return cu_sp;
}

bool SymbolFilePDB::ParseCompileUnitLineTable(CompileUnit &comp_unit,
                                              uint32_t match_line) {
  auto compiland_up = GetPDBCompilandByUID(comp_unit.GetID());
  if (!compiland_up)
    return false;

  // LineEntry needs the *index* of the file into the list of support files
  // returned by ParseCompileUnitSupportFiles.  But the underlying SDK gives us
  // a globally unique idenfitifier in the namespace of the PDB.  So, we have
  // to do a mapping so that we can hand out indices.
  llvm::DenseMap<uint32_t, uint32_t> index_map;
  BuildSupportFileIdToSupportFileIndexMap(*compiland_up, index_map);
  auto line_table = std::make_unique<LineTable>(&comp_unit);

  // Find contributions to `compiland` from all source and header files.
  std::string path = comp_unit.GetPath();
  auto files = m_session_up->getSourceFilesForCompiland(*compiland_up);
  if (!files)
    return false;

  // For each source and header file, create a LineSequence for contributions
  // to the compiland from that file, and add the sequence.
  while (auto file = files->getNext()) {
    std::unique_ptr<LineSequence> sequence(
        line_table->CreateLineSequenceContainer());
    auto lines = m_session_up->findLineNumbers(*compiland_up, *file);
    if (!lines)
      continue;
    int entry_count = lines->getChildCount();

    uint64_t prev_addr;
    uint32_t prev_length;
    uint32_t prev_line;
    uint32_t prev_source_idx;

    for (int i = 0; i < entry_count; ++i) {
      auto line = lines->getChildAtIndex(i);

      uint64_t lno = line->getLineNumber();
      uint64_t addr = line->getVirtualAddress();
      uint32_t length = line->getLength();
      uint32_t source_id = line->getSourceFileId();
      uint32_t col = line->getColumnNumber();
      uint32_t source_idx = index_map[source_id];

      // There was a gap between the current entry and the previous entry if
      // the addresses don't perfectly line up.
      bool is_gap = (i > 0) && (prev_addr + prev_length < addr);

      // Before inserting the current entry, insert a terminal entry at the end
      // of the previous entry's address range if the current entry resulted in
      // a gap from the previous entry.
      if (is_gap && ShouldAddLine(match_line, prev_line, prev_length)) {
        line_table->AppendLineEntryToSequence(
            sequence.get(), prev_addr + prev_length, prev_line, 0,
            prev_source_idx, false, false, false, false, true);

        line_table->InsertSequence(sequence.release());
        sequence.reset(line_table->CreateLineSequenceContainer());
      }

      if (ShouldAddLine(match_line, lno, length)) {
        bool is_statement = line->isStatement();
        bool is_prologue = false;
        bool is_epilogue = false;
        auto func =
            m_session_up->findSymbolByAddress(addr, PDB_SymType::Function);
        if (func) {
          auto prologue = func->findOneChild<PDBSymbolFuncDebugStart>();
          if (prologue)
            is_prologue = (addr == prologue->getVirtualAddress());

          auto epilogue = func->findOneChild<PDBSymbolFuncDebugEnd>();
          if (epilogue)
            is_epilogue = (addr == epilogue->getVirtualAddress());
        }

        line_table->AppendLineEntryToSequence(sequence.get(), addr, lno, col,
                                              source_idx, is_statement, false,
                                              is_prologue, is_epilogue, false);
      }

      prev_addr = addr;
      prev_length = length;
      prev_line = lno;
      prev_source_idx = source_idx;
    }

    if (entry_count > 0 && ShouldAddLine(match_line, prev_line, prev_length)) {
      // The end is always a terminal entry, so insert it regardless.
      line_table->AppendLineEntryToSequence(
          sequence.get(), prev_addr + prev_length, prev_line, 0,
          prev_source_idx, false, false, false, false, true);
    }

    line_table->InsertSequence(sequence.release());
  }

  if (line_table->GetSize()) {
    comp_unit.SetLineTable(line_table.release());
    return true;
  }
  return false;
}

void SymbolFilePDB::BuildSupportFileIdToSupportFileIndexMap(
    const PDBSymbolCompiland &compiland,
    llvm::DenseMap<uint32_t, uint32_t> &index_map) const {
  // This is a hack, but we need to convert the source id into an index into
  // the support files array.  We don't want to do path comparisons to avoid
  // basename / full path issues that may or may not even be a problem, so we
  // use the globally unique source file identifiers.  Ideally we could use the
  // global identifiers everywhere, but LineEntry currently assumes indices.
  auto source_files = m_session_up->getSourceFilesForCompiland(compiland);
  if (!source_files)
    return;

  // LLDB uses the DWARF-like file numeration (one based)
  int index = 1;

  while (auto file = source_files->getNext()) {
    uint32_t source_id = file->getUniqueId();
    index_map[source_id] = index++;
  }
}

lldb::CompUnitSP SymbolFilePDB::GetCompileUnitContainsAddress(
    const lldb_private::Address &so_addr) {
  lldb::addr_t file_vm_addr = so_addr.GetFileAddress();
  if (file_vm_addr == LLDB_INVALID_ADDRESS || file_vm_addr == 0)
    return nullptr;

  // If it is a PDB function's vm addr, this is the first sure bet.
  if (auto lines =
          m_session_up->findLineNumbersByAddress(file_vm_addr, /*Length=*/1)) {
    if (auto first_line = lines->getNext())
      return ParseCompileUnitForUID(first_line->getCompilandId());
  }

  // Otherwise we resort to section contributions.
  if (auto sec_contribs = m_session_up->getSectionContribs()) {
    while (auto section = sec_contribs->getNext()) {
      auto va = section->getVirtualAddress();
      if (file_vm_addr >= va && file_vm_addr < va + section->getLength())
        return ParseCompileUnitForUID(section->getCompilandId());
    }
  }
  return nullptr;
}

Mangled
SymbolFilePDB::GetMangledForPDBFunc(const llvm::pdb::PDBSymbolFunc &pdb_func) {
  Mangled mangled;
  auto func_name = pdb_func.getName();
  auto func_undecorated_name = pdb_func.getUndecoratedName();
  std::string func_decorated_name;

  // Seek from public symbols for non-static function's decorated name if any.
  // For static functions, they don't have undecorated names and aren't exposed
  // in Public Symbols either.
  if (!func_undecorated_name.empty()) {
    auto result_up = m_global_scope_up->findChildren(
        PDB_SymType::PublicSymbol, func_undecorated_name,
        PDB_NameSearchFlags::NS_UndecoratedName);
    if (result_up) {
      while (auto symbol_up = result_up->getNext()) {
        // For a public symbol, it is unique.
        lldbassert(result_up->getChildCount() == 1);
        if (auto *pdb_public_sym =
                llvm::dyn_cast_or_null<PDBSymbolPublicSymbol>(
                    symbol_up.get())) {
          if (pdb_public_sym->isFunction()) {
            func_decorated_name = pdb_public_sym->getName();
            break;
          }
        }
      }
    }
  }
  if (!func_decorated_name.empty()) {
    mangled.SetMangledName(ConstString(func_decorated_name));

    // For MSVC, format of C funciton's decorated name depends on calling
    // conventon. Unfortunately none of the format is recognized by current
    // LLDB. For example, `_purecall` is a __cdecl C function. From PDB,
    // `__purecall` is retrieved as both its decorated and undecorated name
    // (using PDBSymbolFunc::getUndecoratedName method). However `__purecall`
    // string is not treated as mangled in LLDB (neither `?` nor `_Z` prefix).
    // Mangled::GetDemangledName method will fail internally and caches an
    // empty string as its undecorated name. So we will face a contradition
    // here for the same symbol:
    //   non-empty undecorated name from PDB
    //   empty undecorated name from LLDB
    if (!func_undecorated_name.empty() &&
        mangled.GetDemangledName(mangled.GuessLanguage()).IsEmpty())
      mangled.SetDemangledName(ConstString(func_undecorated_name));

    // LLDB uses several flags to control how a C++ decorated name is
    // undecorated for MSVC. See `safeUndecorateName` in Class Mangled. So the
    // yielded name could be different from what we retrieve from
    // PDB source unless we also apply same flags in getting undecorated
    // name through PDBSymbolFunc::getUndecoratedNameEx method.
    if (!func_undecorated_name.empty() &&
        mangled.GetDemangledName(mangled.GuessLanguage()) !=
            ConstString(func_undecorated_name))
      mangled.SetDemangledName(ConstString(func_undecorated_name));
  } else if (!func_undecorated_name.empty()) {
    mangled.SetDemangledName(ConstString(func_undecorated_name));
  } else if (!func_name.empty())
    mangled.SetValue(ConstString(func_name), false);

  return mangled;
}

bool SymbolFilePDB::DeclContextMatchesThisSymbolFile(
    const lldb_private::CompilerDeclContext *decl_ctx) {
  if (decl_ctx == nullptr || !decl_ctx->IsValid())
    return true;

  TypeSystem *decl_ctx_type_system = decl_ctx->GetTypeSystem();
  if (!decl_ctx_type_system)
    return false;
  auto type_system_or_err = GetTypeSystemForLanguage(
      decl_ctx_type_system->GetMinimumLanguage(nullptr));
  if (auto err = type_system_or_err.takeError()) {
    LLDB_LOG_ERROR(
        lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_SYMBOLS),
        std::move(err),
        "Unable to determine if DeclContext matches this symbol file");
    return false;
  }

  if (decl_ctx_type_system == &type_system_or_err.get())
    return true; // The type systems match, return true

  return false;
}

uint32_t SymbolFilePDB::GetCompilandId(const llvm::pdb::PDBSymbolData &data) {
  static const auto pred_upper = [](uint32_t lhs, SecContribInfo rhs) {
    return lhs < rhs.Offset;
  };

  // Cache section contributions
  if (m_sec_contribs.empty()) {
    if (auto SecContribs = m_session_up->getSectionContribs()) {
      while (auto SectionContrib = SecContribs->getNext()) {
        auto comp_id = SectionContrib->getCompilandId();
        if (!comp_id)
          continue;

        auto sec = SectionContrib->getAddressSection();
        auto &sec_cs = m_sec_contribs[sec];

        auto offset = SectionContrib->getAddressOffset();
        auto it =
            std::upper_bound(sec_cs.begin(), sec_cs.end(), offset, pred_upper);

        auto size = SectionContrib->getLength();
        sec_cs.insert(it, {offset, size, comp_id});
      }
    }
  }

  // Check by line number
  if (auto Lines = data.getLineNumbers()) {
    if (auto FirstLine = Lines->getNext())
      return FirstLine->getCompilandId();
  }

  // Retrieve section + offset
  uint32_t DataSection = data.getAddressSection();
  uint32_t DataOffset = data.getAddressOffset();
  if (DataSection == 0) {
    if (auto RVA = data.getRelativeVirtualAddress())
      m_session_up->addressForRVA(RVA, DataSection, DataOffset);
  }

  if (DataSection) {
    // Search by section contributions
    auto &sec_cs = m_sec_contribs[DataSection];
    auto it =
        std::upper_bound(sec_cs.begin(), sec_cs.end(), DataOffset, pred_upper);
    if (it != sec_cs.begin()) {
      --it;
      if (DataOffset < it->Offset + it->Size)
        return it->CompilandId;
    }
  } else {
    // Search in lexical tree
    auto LexParentId = data.getLexicalParentId();
    while (auto LexParent = m_session_up->getSymbolById(LexParentId)) {
      if (LexParent->getSymTag() == PDB_SymType::Exe)
        break;
      if (LexParent->getSymTag() == PDB_SymType::Compiland)
        return LexParentId;
      LexParentId = LexParent->getRawSymbol().getLexicalParentId();
    }
  }

  return 0;
}