1 //===-- PdbUtil.cpp ---------------------------------------------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "PdbUtil.h"
11 
12 #include "DWARFLocationExpression.h"
13 #include "PdbIndex.h"
14 #include "PdbSymUid.h"
15 
16 #include "llvm/DebugInfo/CodeView/SymbolDeserializer.h"
17 #include "llvm/DebugInfo/CodeView/TypeDeserializer.h"
18 #include "llvm/DebugInfo/PDB/Native/TpiStream.h"
19 
20 #include "lldb/Utility/LLDBAssert.h"
21 
22 #include "lldb/lldb-enumerations.h"
23 
24 using namespace lldb_private;
25 using namespace lldb_private::npdb;
26 using namespace llvm::codeview;
27 using namespace llvm::pdb;
28 
29 static Variable::RangeList
30 MakeRangeList(const PdbIndex &index, const LocalVariableAddrRange &range,
31               llvm::ArrayRef<LocalVariableAddrGap> gaps) {
32   lldb::addr_t start =
33       index.MakeVirtualAddress(range.ISectStart, range.OffsetStart);
34   lldb::addr_t end = start + range.Range;
35 
36   Variable::RangeList result;
37   while (!gaps.empty()) {
38     const LocalVariableAddrGap &gap = gaps.front();
39 
40     lldb::addr_t size = gap.GapStartOffset - start;
41     result.Append(start, size);
42     start += gap.Range;
43     gaps = gaps.drop_front();
44   }
45 
46   result.Append(start, end);
47   return result;
48 }
49 
50 CVTagRecord CVTagRecord::create(CVType type) {
51   assert(IsTagRecord(type) && "type is not a tag record!");
52   switch (type.kind()) {
53   case LF_CLASS:
54   case LF_STRUCTURE:
55   case LF_INTERFACE: {
56     ClassRecord cr;
57     llvm::cantFail(TypeDeserializer::deserializeAs<ClassRecord>(type, cr));
58     return CVTagRecord(std::move(cr));
59   }
60   case LF_UNION: {
61     UnionRecord ur;
62     llvm::cantFail(TypeDeserializer::deserializeAs<UnionRecord>(type, ur));
63     return CVTagRecord(std::move(ur));
64   }
65   case LF_ENUM: {
66     EnumRecord er;
67     llvm::cantFail(TypeDeserializer::deserializeAs<EnumRecord>(type, er));
68     return CVTagRecord(std::move(er));
69   }
70   default:
71     llvm_unreachable("Unreachable!");
72   }
73 }
74 
75 CVTagRecord::CVTagRecord(ClassRecord &&c)
76     : cvclass(std::move(c)),
77       m_kind(cvclass.Kind == TypeRecordKind::Struct ? Struct : Class) {}
78 CVTagRecord::CVTagRecord(UnionRecord &&u)
79     : cvunion(std::move(u)), m_kind(Union) {}
80 CVTagRecord::CVTagRecord(EnumRecord &&e) : cvenum(std::move(e)), m_kind(Enum) {}
81 
82 PDB_SymType lldb_private::npdb::CVSymToPDBSym(SymbolKind kind) {
83   switch (kind) {
84   case S_COMPILE3:
85   case S_OBJNAME:
86     return PDB_SymType::CompilandDetails;
87   case S_ENVBLOCK:
88     return PDB_SymType::CompilandEnv;
89   case S_THUNK32:
90   case S_TRAMPOLINE:
91     return PDB_SymType::Thunk;
92   case S_COFFGROUP:
93     return PDB_SymType::CoffGroup;
94   case S_EXPORT:
95     return PDB_SymType::Export;
96   case S_LPROC32:
97   case S_GPROC32:
98   case S_LPROC32_DPC:
99     return PDB_SymType::Function;
100   case S_PUB32:
101     return PDB_SymType::PublicSymbol;
102   case S_INLINESITE:
103     return PDB_SymType::InlineSite;
104   case S_LOCAL:
105   case S_BPREL32:
106   case S_REGREL32:
107   case S_MANCONSTANT:
108   case S_CONSTANT:
109   case S_LDATA32:
110   case S_GDATA32:
111   case S_LMANDATA:
112   case S_GMANDATA:
113   case S_LTHREAD32:
114   case S_GTHREAD32:
115     return PDB_SymType::Data;
116   case S_BLOCK32:
117     return PDB_SymType::Block;
118   case S_LABEL32:
119     return PDB_SymType::Label;
120   case S_CALLSITEINFO:
121     return PDB_SymType::CallSite;
122   case S_HEAPALLOCSITE:
123     return PDB_SymType::HeapAllocationSite;
124   case S_CALLEES:
125     return PDB_SymType::Callee;
126   case S_CALLERS:
127     return PDB_SymType::Caller;
128   default:
129     lldbassert(false && "Invalid symbol record kind!");
130   }
131   return PDB_SymType::None;
132 }
133 
134 PDB_SymType lldb_private::npdb::CVTypeToPDBType(TypeLeafKind kind) {
135   switch (kind) {
136   case LF_ARRAY:
137     return PDB_SymType::ArrayType;
138   case LF_ARGLIST:
139     return PDB_SymType::FunctionSig;
140   case LF_BCLASS:
141     return PDB_SymType::BaseClass;
142   case LF_BINTERFACE:
143     return PDB_SymType::BaseInterface;
144   case LF_CLASS:
145   case LF_STRUCTURE:
146   case LF_INTERFACE:
147   case LF_UNION:
148     return PDB_SymType::UDT;
149   case LF_POINTER:
150     return PDB_SymType::PointerType;
151   case LF_ENUM:
152     return PDB_SymType::Enum;
153   case LF_PROCEDURE:
154     return PDB_SymType::FunctionSig;
155   case LF_BITFIELD:
156     return PDB_SymType::BuiltinType;
157   default:
158     lldbassert(false && "Invalid type record kind!");
159   }
160   return PDB_SymType::None;
161 }
162 
163 bool lldb_private::npdb::SymbolHasAddress(const CVSymbol &sym) {
164   switch (sym.kind()) {
165   case S_GPROC32:
166   case S_LPROC32:
167   case S_GPROC32_ID:
168   case S_LPROC32_ID:
169   case S_LPROC32_DPC:
170   case S_LPROC32_DPC_ID:
171   case S_THUNK32:
172   case S_TRAMPOLINE:
173   case S_COFFGROUP:
174   case S_BLOCK32:
175   case S_LABEL32:
176   case S_CALLSITEINFO:
177   case S_HEAPALLOCSITE:
178   case S_LDATA32:
179   case S_GDATA32:
180   case S_LMANDATA:
181   case S_GMANDATA:
182   case S_LTHREAD32:
183   case S_GTHREAD32:
184     return true;
185   default:
186     return false;
187   }
188 }
189 
190 bool lldb_private::npdb::SymbolIsCode(const CVSymbol &sym) {
191   switch (sym.kind()) {
192   case S_GPROC32:
193   case S_LPROC32:
194   case S_GPROC32_ID:
195   case S_LPROC32_ID:
196   case S_LPROC32_DPC:
197   case S_LPROC32_DPC_ID:
198   case S_THUNK32:
199   case S_TRAMPOLINE:
200   case S_COFFGROUP:
201   case S_BLOCK32:
202     return true;
203   default:
204     return false;
205   }
206 }
207 
208 template <typename RecordT> RecordT createRecord(const CVSymbol &sym) {
209   RecordT record(static_cast<SymbolRecordKind>(sym.kind()));
210   cantFail(SymbolDeserializer::deserializeAs<RecordT>(sym, record));
211   return record;
212 }
213 
214 template <typename RecordT>
215 static SegmentOffset GetSegmentAndOffset(const CVSymbol &sym) {
216   RecordT record = createRecord<RecordT>(sym);
217   return {record.Segment, record.CodeOffset};
218 }
219 
220 template <>
221 SegmentOffset GetSegmentAndOffset<TrampolineSym>(const CVSymbol &sym) {
222   TrampolineSym record = createRecord<TrampolineSym>(sym);
223   return {record.ThunkSection, record.ThunkOffset};
224 }
225 
226 template <> SegmentOffset GetSegmentAndOffset<Thunk32Sym>(const CVSymbol &sym) {
227   Thunk32Sym record = createRecord<Thunk32Sym>(sym);
228   return {record.Segment, record.Offset};
229 }
230 
231 template <>
232 SegmentOffset GetSegmentAndOffset<CoffGroupSym>(const CVSymbol &sym) {
233   CoffGroupSym record = createRecord<CoffGroupSym>(sym);
234   return {record.Segment, record.Offset};
235 }
236 
237 template <> SegmentOffset GetSegmentAndOffset<DataSym>(const CVSymbol &sym) {
238   DataSym record = createRecord<DataSym>(sym);
239   return {record.Segment, record.DataOffset};
240 }
241 
242 template <>
243 SegmentOffset GetSegmentAndOffset<ThreadLocalDataSym>(const CVSymbol &sym) {
244   ThreadLocalDataSym record = createRecord<ThreadLocalDataSym>(sym);
245   return {record.Segment, record.DataOffset};
246 }
247 
248 SegmentOffset lldb_private::npdb::GetSegmentAndOffset(const CVSymbol &sym) {
249   switch (sym.kind()) {
250   case S_GPROC32:
251   case S_LPROC32:
252   case S_GPROC32_ID:
253   case S_LPROC32_ID:
254   case S_LPROC32_DPC:
255   case S_LPROC32_DPC_ID:
256     return ::GetSegmentAndOffset<ProcSym>(sym);
257   case S_THUNK32:
258     return ::GetSegmentAndOffset<Thunk32Sym>(sym);
259     break;
260   case S_TRAMPOLINE:
261     return ::GetSegmentAndOffset<TrampolineSym>(sym);
262     break;
263   case S_COFFGROUP:
264     return ::GetSegmentAndOffset<CoffGroupSym>(sym);
265     break;
266   case S_BLOCK32:
267     return ::GetSegmentAndOffset<BlockSym>(sym);
268     break;
269   case S_LABEL32:
270     return ::GetSegmentAndOffset<LabelSym>(sym);
271     break;
272   case S_CALLSITEINFO:
273     return ::GetSegmentAndOffset<CallSiteInfoSym>(sym);
274     break;
275   case S_HEAPALLOCSITE:
276     return ::GetSegmentAndOffset<HeapAllocationSiteSym>(sym);
277     break;
278   case S_LDATA32:
279   case S_GDATA32:
280   case S_LMANDATA:
281   case S_GMANDATA:
282     return ::GetSegmentAndOffset<DataSym>(sym);
283     break;
284   case S_LTHREAD32:
285   case S_GTHREAD32:
286     return ::GetSegmentAndOffset<ThreadLocalDataSym>(sym);
287     break;
288   default:
289     lldbassert(false && "Record does not have a segment/offset!");
290   }
291   return {0, 0};
292 }
293 
294 template <typename RecordT>
295 SegmentOffsetLength GetSegmentOffsetAndLength(const CVSymbol &sym) {
296   RecordT record = createRecord<RecordT>(sym);
297   return {record.Segment, record.CodeOffset, record.CodeSize};
298 }
299 
300 template <>
301 SegmentOffsetLength
302 GetSegmentOffsetAndLength<TrampolineSym>(const CVSymbol &sym) {
303   TrampolineSym record = createRecord<TrampolineSym>(sym);
304   return {record.ThunkSection, record.ThunkOffset, record.Size};
305 }
306 
307 template <>
308 SegmentOffsetLength GetSegmentOffsetAndLength<Thunk32Sym>(const CVSymbol &sym) {
309   Thunk32Sym record = createRecord<Thunk32Sym>(sym);
310   return SegmentOffsetLength{record.Segment, record.Offset, record.Length};
311 }
312 
313 template <>
314 SegmentOffsetLength
315 GetSegmentOffsetAndLength<CoffGroupSym>(const CVSymbol &sym) {
316   CoffGroupSym record = createRecord<CoffGroupSym>(sym);
317   return SegmentOffsetLength{record.Segment, record.Offset, record.Size};
318 }
319 
320 SegmentOffsetLength
321 lldb_private::npdb::GetSegmentOffsetAndLength(const CVSymbol &sym) {
322   switch (sym.kind()) {
323   case S_GPROC32:
324   case S_LPROC32:
325   case S_GPROC32_ID:
326   case S_LPROC32_ID:
327   case S_LPROC32_DPC:
328   case S_LPROC32_DPC_ID:
329     return ::GetSegmentOffsetAndLength<ProcSym>(sym);
330   case S_THUNK32:
331     return ::GetSegmentOffsetAndLength<Thunk32Sym>(sym);
332     break;
333   case S_TRAMPOLINE:
334     return ::GetSegmentOffsetAndLength<TrampolineSym>(sym);
335     break;
336   case S_COFFGROUP:
337     return ::GetSegmentOffsetAndLength<CoffGroupSym>(sym);
338     break;
339   case S_BLOCK32:
340     return ::GetSegmentOffsetAndLength<BlockSym>(sym);
341     break;
342   default:
343     lldbassert(false && "Record does not have a segment/offset/length triple!");
344   }
345   return {0, 0, 0};
346 }
347 
348 bool lldb_private::npdb::IsForwardRefUdt(CVType cvt) {
349   ClassRecord cr;
350   UnionRecord ur;
351   EnumRecord er;
352   switch (cvt.kind()) {
353   case LF_CLASS:
354   case LF_STRUCTURE:
355   case LF_INTERFACE:
356     llvm::cantFail(TypeDeserializer::deserializeAs<ClassRecord>(cvt, cr));
357     return cr.isForwardRef();
358   case LF_UNION:
359     llvm::cantFail(TypeDeserializer::deserializeAs<UnionRecord>(cvt, ur));
360     return ur.isForwardRef();
361   case LF_ENUM:
362     llvm::cantFail(TypeDeserializer::deserializeAs<EnumRecord>(cvt, er));
363     return er.isForwardRef();
364   default:
365     return false;
366   }
367 }
368 
369 bool lldb_private::npdb::IsTagRecord(llvm::codeview::CVType cvt) {
370   switch (cvt.kind()) {
371   case LF_CLASS:
372   case LF_STRUCTURE:
373   case LF_UNION:
374   case LF_ENUM:
375     return true;
376   default:
377     return false;
378   }
379 }
380 
381 bool lldb_private::npdb::IsClassStructUnion(llvm::codeview::CVType cvt) {
382   switch (cvt.kind()) {
383   case LF_CLASS:
384   case LF_STRUCTURE:
385   case LF_UNION:
386     return true;
387   default:
388     return false;
389   }
390 }
391 
392 bool lldb_private::npdb::IsForwardRefUdt(const PdbTypeSymId &id,
393                                          TpiStream &tpi) {
394   if (id.is_ipi || id.index.isSimple())
395     return false;
396   return IsForwardRefUdt(tpi.getType(id.index));
397 }
398 
399 bool lldb_private::npdb::IsTagRecord(const PdbTypeSymId &id, TpiStream &tpi) {
400   if (id.is_ipi || id.index.isSimple())
401     return false;
402   return IsTagRecord(tpi.getType(id.index));
403 }
404 
405 lldb::AccessType
406 lldb_private::npdb::TranslateMemberAccess(MemberAccess access) {
407   switch (access) {
408   case MemberAccess::Private:
409     return lldb::eAccessPrivate;
410   case MemberAccess::Protected:
411     return lldb::eAccessProtected;
412   case MemberAccess::Public:
413     return lldb::eAccessPublic;
414   case MemberAccess::None:
415     return lldb::eAccessNone;
416   }
417   llvm_unreachable("unreachable");
418 }
419 
420 TypeIndex lldb_private::npdb::GetFieldListIndex(CVType cvt) {
421   switch (cvt.kind()) {
422   case LF_CLASS:
423   case LF_STRUCTURE:
424   case LF_INTERFACE: {
425     ClassRecord cr;
426     cantFail(TypeDeserializer::deserializeAs<ClassRecord>(cvt, cr));
427     return cr.FieldList;
428   }
429   case LF_UNION: {
430     UnionRecord ur;
431     cantFail(TypeDeserializer::deserializeAs<UnionRecord>(cvt, ur));
432     return ur.FieldList;
433   }
434   case LF_ENUM: {
435     EnumRecord er;
436     cantFail(TypeDeserializer::deserializeAs<EnumRecord>(cvt, er));
437     return er.FieldList;
438   }
439   default:
440     llvm_unreachable("Unreachable!");
441   }
442 }
443 
444 TypeIndex lldb_private::npdb::LookThroughModifierRecord(CVType modifier) {
445   lldbassert(modifier.kind() == LF_MODIFIER);
446   ModifierRecord mr;
447   llvm::cantFail(TypeDeserializer::deserializeAs<ModifierRecord>(modifier, mr));
448   return mr.ModifiedType;
449 }
450 
451 llvm::StringRef lldb_private::npdb::DropNameScope(llvm::StringRef name) {
452   // Not all PDB names can be parsed with CPlusPlusNameParser.
453   // E.g. it fails on names containing `anonymous namespace'.
454   // So we simply drop everything before '::'
455 
456   auto offset = name.rfind("::");
457   if (offset == llvm::StringRef::npos)
458     return name;
459   assert(offset + 2 <= name.size());
460 
461   return name.substr(offset + 2);
462 }
463 
464 VariableInfo lldb_private::npdb::GetVariableNameInfo(CVSymbol sym) {
465   VariableInfo result;
466 
467   if (sym.kind() == S_REGREL32) {
468     RegRelativeSym reg(SymbolRecordKind::RegRelativeSym);
469     cantFail(SymbolDeserializer::deserializeAs<RegRelativeSym>(sym, reg));
470     result.type = reg.Type;
471     result.name = reg.Name;
472     return result;
473   }
474 
475   if (sym.kind() == S_REGISTER) {
476     RegisterSym reg(SymbolRecordKind::RegisterSym);
477     cantFail(SymbolDeserializer::deserializeAs<RegisterSym>(sym, reg));
478     result.type = reg.Index;
479     result.name = reg.Name;
480     return result;
481   }
482 
483   if (sym.kind() == S_LOCAL) {
484     LocalSym local(SymbolRecordKind::LocalSym);
485     cantFail(SymbolDeserializer::deserializeAs<LocalSym>(sym, local));
486     result.type = local.Type;
487     result.name = local.Name;
488     return result;
489   }
490 
491   lldbassert(false && "Invalid variable record kind!");
492   return {};
493 }
494 
495 VariableInfo lldb_private::npdb::GetVariableLocationInfo(
496     PdbIndex &index, PdbCompilandSymId var_id, lldb::ModuleSP module) {
497 
498   CVSymbol sym = index.ReadSymbolRecord(var_id);
499 
500   VariableInfo result = GetVariableNameInfo(sym);
501 
502   if (sym.kind() == S_REGREL32) {
503     RegRelativeSym reg(SymbolRecordKind::RegRelativeSym);
504     cantFail(SymbolDeserializer::deserializeAs<RegRelativeSym>(sym, reg));
505     result.location =
506         MakeRegRelLocationExpression(reg.Register, reg.Offset, module);
507     result.ranges.emplace();
508     return result;
509   }
510 
511   if (sym.kind() == S_REGISTER) {
512     RegisterSym reg(SymbolRecordKind::RegisterSym);
513     cantFail(SymbolDeserializer::deserializeAs<RegisterSym>(sym, reg));
514     result.location = MakeEnregisteredLocationExpression(reg.Register, module);
515     result.ranges.emplace();
516     return result;
517   }
518 
519   if (sym.kind() == S_LOCAL) {
520     LocalSym local(SymbolRecordKind::LocalSym);
521     cantFail(SymbolDeserializer::deserializeAs<LocalSym>(sym, local));
522 
523     PdbCompilandSymId loc_specifier_id(var_id.modi,
524                                        var_id.offset + sym.RecordData.size());
525     CVSymbol loc_specifier_cvs = index.ReadSymbolRecord(loc_specifier_id);
526     if (loc_specifier_cvs.kind() == S_DEFRANGE_FRAMEPOINTER_REL) {
527       DefRangeFramePointerRelSym loc(
528           SymbolRecordKind::DefRangeFramePointerRelSym);
529       cantFail(SymbolDeserializer::deserializeAs<DefRangeFramePointerRelSym>(
530           loc_specifier_cvs, loc));
531       // FIXME: The register needs to come from the S_FRAMEPROC symbol.
532       result.location =
533           MakeRegRelLocationExpression(RegisterId::RSP, loc.Offset, module);
534       result.ranges = MakeRangeList(index, loc.Range, loc.Gaps);
535     } else {
536       // FIXME: Handle other kinds
537       llvm::APSInt value;
538       value = 42;
539       result.location = MakeConstantLocationExpression(
540           TypeIndex::Int32(), index.tpi(), value, module);
541     }
542     return result;
543   }
544   llvm_unreachable("Symbol is not a local variable!");
545   return result;
546 }
547 
548 lldb::BasicType
549 lldb_private::npdb::GetCompilerTypeForSimpleKind(SimpleTypeKind kind) {
550   switch (kind) {
551   case SimpleTypeKind::Boolean128:
552   case SimpleTypeKind::Boolean16:
553   case SimpleTypeKind::Boolean32:
554   case SimpleTypeKind::Boolean64:
555   case SimpleTypeKind::Boolean8:
556     return lldb::eBasicTypeBool;
557   case SimpleTypeKind::Byte:
558   case SimpleTypeKind::UnsignedCharacter:
559     return lldb::eBasicTypeUnsignedChar;
560   case SimpleTypeKind::NarrowCharacter:
561     return lldb::eBasicTypeChar;
562   case SimpleTypeKind::SignedCharacter:
563   case SimpleTypeKind::SByte:
564     return lldb::eBasicTypeSignedChar;
565   case SimpleTypeKind::Character16:
566     return lldb::eBasicTypeChar16;
567   case SimpleTypeKind::Character32:
568     return lldb::eBasicTypeChar32;
569   case SimpleTypeKind::Complex80:
570     return lldb::eBasicTypeLongDoubleComplex;
571   case SimpleTypeKind::Complex64:
572     return lldb::eBasicTypeDoubleComplex;
573   case SimpleTypeKind::Complex32:
574     return lldb::eBasicTypeFloatComplex;
575   case SimpleTypeKind::Float128:
576   case SimpleTypeKind::Float80:
577     return lldb::eBasicTypeLongDouble;
578   case SimpleTypeKind::Float64:
579     return lldb::eBasicTypeDouble;
580   case SimpleTypeKind::Float32:
581     return lldb::eBasicTypeFloat;
582   case SimpleTypeKind::Float16:
583     return lldb::eBasicTypeHalf;
584   case SimpleTypeKind::Int128:
585     return lldb::eBasicTypeInt128;
586   case SimpleTypeKind::Int64:
587   case SimpleTypeKind::Int64Quad:
588     return lldb::eBasicTypeLongLong;
589   case SimpleTypeKind::Int32:
590     return lldb::eBasicTypeInt;
591   case SimpleTypeKind::Int16:
592   case SimpleTypeKind::Int16Short:
593     return lldb::eBasicTypeShort;
594   case SimpleTypeKind::UInt128:
595     return lldb::eBasicTypeUnsignedInt128;
596   case SimpleTypeKind::UInt64:
597   case SimpleTypeKind::UInt64Quad:
598     return lldb::eBasicTypeUnsignedLongLong;
599   case SimpleTypeKind::HResult:
600   case SimpleTypeKind::UInt32:
601     return lldb::eBasicTypeUnsignedInt;
602   case SimpleTypeKind::UInt16:
603   case SimpleTypeKind::UInt16Short:
604     return lldb::eBasicTypeUnsignedShort;
605   case SimpleTypeKind::Int32Long:
606     return lldb::eBasicTypeLong;
607   case SimpleTypeKind::UInt32Long:
608     return lldb::eBasicTypeUnsignedLong;
609   case SimpleTypeKind::Void:
610     return lldb::eBasicTypeVoid;
611   case SimpleTypeKind::WideCharacter:
612     return lldb::eBasicTypeWChar;
613   default:
614     return lldb::eBasicTypeInvalid;
615   }
616 }
617 
618 size_t lldb_private::npdb::GetTypeSizeForSimpleKind(SimpleTypeKind kind) {
619   switch (kind) {
620   case SimpleTypeKind::Boolean128:
621   case SimpleTypeKind::Int128:
622   case SimpleTypeKind::UInt128:
623   case SimpleTypeKind::Float128:
624     return 16;
625   case SimpleTypeKind::Complex80:
626   case SimpleTypeKind::Float80:
627     return 10;
628   case SimpleTypeKind::Boolean64:
629   case SimpleTypeKind::Complex64:
630   case SimpleTypeKind::UInt64:
631   case SimpleTypeKind::UInt64Quad:
632   case SimpleTypeKind::Float64:
633   case SimpleTypeKind::Int64:
634   case SimpleTypeKind::Int64Quad:
635     return 8;
636   case SimpleTypeKind::Boolean32:
637   case SimpleTypeKind::Character32:
638   case SimpleTypeKind::Complex32:
639   case SimpleTypeKind::Float32:
640   case SimpleTypeKind::Int32:
641   case SimpleTypeKind::Int32Long:
642   case SimpleTypeKind::UInt32Long:
643   case SimpleTypeKind::HResult:
644   case SimpleTypeKind::UInt32:
645     return 4;
646   case SimpleTypeKind::Boolean16:
647   case SimpleTypeKind::Character16:
648   case SimpleTypeKind::Float16:
649   case SimpleTypeKind::Int16:
650   case SimpleTypeKind::Int16Short:
651   case SimpleTypeKind::UInt16:
652   case SimpleTypeKind::UInt16Short:
653   case SimpleTypeKind::WideCharacter:
654     return 2;
655   case SimpleTypeKind::Boolean8:
656   case SimpleTypeKind::Byte:
657   case SimpleTypeKind::UnsignedCharacter:
658   case SimpleTypeKind::NarrowCharacter:
659   case SimpleTypeKind::SignedCharacter:
660   case SimpleTypeKind::SByte:
661     return 1;
662   case SimpleTypeKind::Void:
663   default:
664     return 0;
665   }
666 }
667 
668 PdbTypeSymId lldb_private::npdb::GetBestPossibleDecl(PdbTypeSymId id,
669                                                      TpiStream &tpi) {
670   if (id.index.isSimple())
671     return id;
672 
673   CVType cvt = tpi.getType(id.index);
674 
675   // Only tag records have a best and a worst record.
676   if (!IsTagRecord(cvt))
677     return id;
678 
679   // Tag records that are not forward decls are full decls, hence they are the
680   // best.
681   if (!IsForwardRefUdt(cvt))
682     return id;
683 
684   return llvm::cantFail(tpi.findFullDeclForForwardRef(id.index));
685 }
686 
687 template <typename RecordType> static size_t GetSizeOfTypeInternal(CVType cvt) {
688   RecordType record;
689   llvm::cantFail(TypeDeserializer::deserializeAs<RecordType>(cvt, record));
690   return record.getSize();
691 }
692 
693 size_t lldb_private::npdb::GetSizeOfType(PdbTypeSymId id,
694                                          llvm::pdb::TpiStream &tpi) {
695   if (id.index.isSimple()) {
696     switch (id.index.getSimpleMode()) {
697     case SimpleTypeMode::Direct:
698       return GetTypeSizeForSimpleKind(id.index.getSimpleKind());
699     case SimpleTypeMode::NearPointer32:
700     case SimpleTypeMode::FarPointer32:
701       return 4;
702     case SimpleTypeMode::NearPointer64:
703       return 8;
704     case SimpleTypeMode::NearPointer128:
705       return 16;
706     default:
707       break;
708     }
709     return 0;
710   }
711 
712   CVType cvt = tpi.getType(id.index);
713   switch (cvt.kind()) {
714   case LF_MODIFIER:
715     return GetSizeOfType({LookThroughModifierRecord(cvt)}, tpi);
716   case LF_ENUM: {
717     EnumRecord record;
718     llvm::cantFail(TypeDeserializer::deserializeAs<EnumRecord>(cvt, record));
719     return GetSizeOfType({record.UnderlyingType}, tpi);
720   }
721   case LF_POINTER:
722     return GetSizeOfTypeInternal<PointerRecord>(cvt);
723   case LF_ARRAY:
724     return GetSizeOfTypeInternal<ArrayRecord>(cvt);
725   case LF_CLASS:
726   case LF_STRUCTURE:
727   case LF_INTERFACE:
728     return GetSizeOfTypeInternal<ClassRecord>(cvt);
729   case LF_UNION:
730     return GetSizeOfTypeInternal<UnionRecord>(cvt);
731   default:
732     break;
733   }
734   return 0;
735 }
736