llvm.org GIT mirror llvm / release_70 tools / llvm-pdbutil / ExplainOutputStyle.cpp
release_70

Tree @release_70 (Download .tar.gz)

ExplainOutputStyle.cpp @release_70raw · history · 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
//===- ExplainOutputStyle.cpp --------------------------------- *- C++ --*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "ExplainOutputStyle.h"

#include "FormatUtil.h"
#include "InputFile.h"
#include "StreamUtil.h"
#include "llvm-pdbutil.h"

#include "llvm/DebugInfo/CodeView/Formatters.h"
#include "llvm/DebugInfo/MSF/MappedBlockStream.h"
#include "llvm/DebugInfo/PDB/Native/DbiStream.h"
#include "llvm/DebugInfo/PDB/Native/InfoStream.h"
#include "llvm/DebugInfo/PDB/Native/PDBFile.h"
#include "llvm/DebugInfo/PDB/Native/RawTypes.h"
#include "llvm/Support/BinaryByteStream.h"
#include "llvm/Support/BinaryStreamArray.h"
#include "llvm/Support/Error.h"

using namespace llvm;
using namespace llvm::codeview;
using namespace llvm::msf;
using namespace llvm::pdb;

ExplainOutputStyle::ExplainOutputStyle(InputFile &File, uint64_t FileOffset)
    : File(File), FileOffset(FileOffset), P(2, false, outs()) {}

Error ExplainOutputStyle::dump() {
  P.formatLine("Explaining file offset {0} of file '{1}'.", FileOffset,
               File.getFilePath());

  if (File.isPdb())
    return explainPdbFile();

  return explainBinaryFile();
}

Error ExplainOutputStyle::explainPdbFile() {
  bool IsAllocated = explainPdbBlockStatus();
  if (!IsAllocated)
    return Error::success();

  AutoIndent Indent(P);
  if (isPdbSuperBlock())
    explainPdbSuperBlockOffset();
  else if (isPdbFpmBlock())
    explainPdbFpmBlockOffset();
  else if (isPdbBlockMapBlock())
    explainPdbBlockMapOffset();
  else if (isPdbStreamDirectoryBlock())
    explainPdbStreamDirectoryOffset();
  else if (auto Index = getPdbBlockStreamIndex())
    explainPdbStreamOffset(*Index);
  else
    explainPdbUnknownBlock();
  return Error::success();
}

Error ExplainOutputStyle::explainBinaryFile() {
  std::unique_ptr<BinaryByteStream> Stream =
      llvm::make_unique<BinaryByteStream>(File.unknown().getBuffer(),
                                          llvm::support::little);
  switch (opts::explain::InputType) {
  case opts::explain::InputFileType::DBIStream: {
    DbiStream Dbi(std::move(Stream));
    if (auto EC = Dbi.reload(nullptr))
      return EC;
    explainStreamOffset(Dbi, FileOffset);
    break;
  }
  case opts::explain::InputFileType::PDBStream: {
    InfoStream Info(std::move(Stream));
    if (auto EC = Info.reload())
      return EC;
    explainStreamOffset(Info, FileOffset);
    break;
  }
  default:
    llvm_unreachable("Invalid input file type!");
  }
  return Error::success();
}

uint32_t ExplainOutputStyle::pdbBlockIndex() const {
  return FileOffset / File.pdb().getBlockSize();
}

uint32_t ExplainOutputStyle::pdbBlockOffset() const {
  uint64_t BlockStart = pdbBlockIndex() * File.pdb().getBlockSize();
  assert(FileOffset >= BlockStart);
  return FileOffset - BlockStart;
}

bool ExplainOutputStyle::isPdbSuperBlock() const {
  return pdbBlockIndex() == 0;
}

bool ExplainOutputStyle::isPdbFpm1() const {
  return ((pdbBlockIndex() - 1) % File.pdb().getBlockSize() == 0);
}
bool ExplainOutputStyle::isPdbFpm2() const {
  return ((pdbBlockIndex() - 2) % File.pdb().getBlockSize() == 0);
}

bool ExplainOutputStyle::isPdbFpmBlock() const {
  return isPdbFpm1() || isPdbFpm2();
}

bool ExplainOutputStyle::isPdbBlockMapBlock() const {
  return pdbBlockIndex() == File.pdb().getBlockMapIndex();
}

bool ExplainOutputStyle::isPdbStreamDirectoryBlock() const {
  const auto &Layout = File.pdb().getMsfLayout();
  return llvm::is_contained(Layout.DirectoryBlocks, pdbBlockIndex());
}

Optional<uint32_t> ExplainOutputStyle::getPdbBlockStreamIndex() const {
  const auto &Layout = File.pdb().getMsfLayout();
  for (const auto &Entry : enumerate(Layout.StreamMap)) {
    if (!llvm::is_contained(Entry.value(), pdbBlockIndex()))
      continue;
    return Entry.index();
  }
  return None;
}

bool ExplainOutputStyle::explainPdbBlockStatus() {
  if (FileOffset >= File.pdb().getFileSize()) {
    P.formatLine("Address {0} is not in the file (file size = {1}).",
                 FileOffset, File.pdb().getFileSize());
    return false;
  }
  P.formatLine("Block:Offset = {2:X-}:{1:X-4}.", FileOffset, pdbBlockOffset(),
               pdbBlockIndex());

  bool IsFree = File.pdb().getMsfLayout().FreePageMap[pdbBlockIndex()];
  P.formatLine("Address is in block {0} ({1}allocated).", pdbBlockIndex(),
               IsFree ? "un" : "");
  return !IsFree;
}

#define endof(Class, Field) (offsetof(Class, Field) + sizeof(Class::Field))

void ExplainOutputStyle::explainPdbSuperBlockOffset() {
  P.formatLine("This corresponds to offset {0} of the MSF super block, ",
               pdbBlockOffset());
  if (pdbBlockOffset() < endof(SuperBlock, MagicBytes))
    P.printLine("which is part of the MSF file magic.");
  else if (pdbBlockOffset() < endof(SuperBlock, BlockSize)) {
    P.printLine("which contains the block size of the file.");
    P.formatLine("The current value is {0}.",
                 uint32_t(File.pdb().getMsfLayout().SB->BlockSize));
  } else if (pdbBlockOffset() < endof(SuperBlock, FreeBlockMapBlock)) {
    P.printLine("which contains the index of the FPM block (e.g. 1 or 2).");
    P.formatLine("The current value is {0}.",
                 uint32_t(File.pdb().getMsfLayout().SB->FreeBlockMapBlock));
  } else if (pdbBlockOffset() < endof(SuperBlock, NumBlocks)) {
    P.printLine("which contains the number of blocks in the file.");
    P.formatLine("The current value is {0}.",
                 uint32_t(File.pdb().getMsfLayout().SB->NumBlocks));
  } else if (pdbBlockOffset() < endof(SuperBlock, NumDirectoryBytes)) {
    P.printLine("which contains the number of bytes in the stream directory.");
    P.formatLine("The current value is {0}.",
                 uint32_t(File.pdb().getMsfLayout().SB->NumDirectoryBytes));
  } else if (pdbBlockOffset() < endof(SuperBlock, Unknown1)) {
    P.printLine("whose purpose is unknown.");
    P.formatLine("The current value is {0}.",
                 uint32_t(File.pdb().getMsfLayout().SB->Unknown1));
  } else if (pdbBlockOffset() < endof(SuperBlock, BlockMapAddr)) {
    P.printLine("which contains the file offset of the block map.");
    P.formatLine("The current value is {0}.",
                 uint32_t(File.pdb().getMsfLayout().SB->BlockMapAddr));
  } else {
    assert(pdbBlockOffset() > sizeof(SuperBlock));
    P.printLine(
        "which is outside the range of valid data for the super block.");
  }
}

static std::string toBinaryString(uint8_t Byte) {
  char Result[9] = {0};
  for (int I = 0; I < 8; ++I) {
    char C = (Byte & 1) ? '1' : '0';
    Result[I] = C;
    Byte >>= 1;
  }
  return std::string(Result);
}

void ExplainOutputStyle::explainPdbFpmBlockOffset() {
  const MSFLayout &Layout = File.pdb().getMsfLayout();
  uint32_t MainFpm = Layout.mainFpmBlock();
  uint32_t AltFpm = Layout.alternateFpmBlock();

  assert(isPdbFpmBlock());
  uint32_t Fpm = isPdbFpm1() ? 1 : 2;
  uint32_t FpmChunk = pdbBlockIndex() / File.pdb().getBlockSize();
  assert((Fpm == MainFpm) || (Fpm == AltFpm));
  (void)AltFpm;
  bool IsMain = (Fpm == MainFpm);
  P.formatLine("Address is in FPM{0} ({1} FPM)", Fpm, IsMain ? "Main" : "Alt");
  uint32_t DescribedBlockStart =
      8 * (FpmChunk * File.pdb().getBlockSize() + pdbBlockOffset());
  if (DescribedBlockStart > File.pdb().getBlockCount()) {
    P.printLine("Address is in extraneous FPM space.");
    return;
  }

  P.formatLine("Address describes the allocation status of blocks [{0},{1})",
               DescribedBlockStart, DescribedBlockStart + 8);
  ArrayRef<uint8_t> Bytes;
  cantFail(File.pdb().getMsfBuffer().readBytes(FileOffset, 1, Bytes));
  P.formatLine("Status = {0} (Note: 0 = allocated, 1 = free)",
               toBinaryString(Bytes[0]));
}

void ExplainOutputStyle::explainPdbBlockMapOffset() {
  uint64_t BlockMapOffset = File.pdb().getBlockMapOffset();
  uint32_t OffsetInBlock = FileOffset - BlockMapOffset;
  P.formatLine("Address is at offset {0} of the directory block list",
               OffsetInBlock);
}

static uint32_t getOffsetInStream(ArrayRef<support::ulittle32_t> StreamBlocks,
                                  uint64_t FileOffset, uint32_t BlockSize) {
  uint32_t BlockIndex = FileOffset / BlockSize;
  uint32_t OffsetInBlock = FileOffset - BlockIndex * BlockSize;

  auto Iter = llvm::find(StreamBlocks, BlockIndex);
  assert(Iter != StreamBlocks.end());
  uint32_t StreamBlockIndex = std::distance(StreamBlocks.begin(), Iter);
  return StreamBlockIndex * BlockSize + OffsetInBlock;
}

void ExplainOutputStyle::explainPdbStreamOffset(uint32_t Stream) {
  SmallVector<StreamInfo, 12> Streams;
  discoverStreamPurposes(File.pdb(), Streams);

  assert(Stream <= Streams.size());
  const StreamInfo &S = Streams[Stream];
  const auto &Layout = File.pdb().getStreamLayout(Stream);
  uint32_t StreamOff =
      getOffsetInStream(Layout.Blocks, FileOffset, File.pdb().getBlockSize());
  P.formatLine("Address is at offset {0}/{1} of Stream {2} ({3}){4}.",
               StreamOff, Layout.Length, Stream, S.getLongName(),
               (StreamOff > Layout.Length) ? " in unused space" : "");
  switch (S.getPurpose()) {
  case StreamPurpose::DBI: {
    DbiStream &Dbi = cantFail(File.pdb().getPDBDbiStream());
    explainStreamOffset(Dbi, StreamOff);
    break;
  }
  case StreamPurpose::PDB: {
    InfoStream &Info = cantFail(File.pdb().getPDBInfoStream());
    explainStreamOffset(Info, StreamOff);
    break;
  }
  case StreamPurpose::IPI:
  case StreamPurpose::TPI:
  case StreamPurpose::ModuleStream:
  case StreamPurpose::NamedStream:
  default:
    break;
  }
}

void ExplainOutputStyle::explainPdbStreamDirectoryOffset() {
  auto DirectoryBlocks = File.pdb().getDirectoryBlockArray();
  const auto &Layout = File.pdb().getMsfLayout();
  uint32_t StreamOff =
      getOffsetInStream(DirectoryBlocks, FileOffset, File.pdb().getBlockSize());
  P.formatLine("Address is at offset {0}/{1} of Stream Directory{2}.",
               StreamOff, uint32_t(Layout.SB->NumDirectoryBytes),
               uint32_t(StreamOff > Layout.SB->NumDirectoryBytes)
                   ? " in unused space"
                   : "");
}

void ExplainOutputStyle::explainPdbUnknownBlock() {
  P.formatLine("Address has unknown purpose.");
}

template <typename T>
static void printStructField(LinePrinter &P, StringRef Label, T Value) {
  P.formatLine("which contains {0}.", Label);
  P.formatLine("The current value is {0}.", Value);
}

static void explainDbiHeaderOffset(LinePrinter &P, DbiStream &Dbi,
                                   uint32_t Offset) {
  const DbiStreamHeader *Header = Dbi.getHeader();
  assert(Header != nullptr);

  if (Offset < endof(DbiStreamHeader, VersionSignature))
    printStructField(P, "the DBI Stream Version Signature",
                     int32_t(Header->VersionSignature));
  else if (Offset < endof(DbiStreamHeader, VersionHeader))
    printStructField(P, "the DBI Stream Version Header",
                     uint32_t(Header->VersionHeader));
  else if (Offset < endof(DbiStreamHeader, Age))
    printStructField(P, "the age of the DBI Stream", uint32_t(Header->Age));
  else if (Offset < endof(DbiStreamHeader, GlobalSymbolStreamIndex))
    printStructField(P, "the index of the Global Symbol Stream",
                     uint16_t(Header->GlobalSymbolStreamIndex));
  else if (Offset < endof(DbiStreamHeader, BuildNumber))
    printStructField(P, "the build number", uint16_t(Header->BuildNumber));
  else if (Offset < endof(DbiStreamHeader, PublicSymbolStreamIndex))
    printStructField(P, "the index of the Public Symbol Stream",
                     uint16_t(Header->PublicSymbolStreamIndex));
  else if (Offset < endof(DbiStreamHeader, PdbDllVersion))
    printStructField(P, "the version of mspdb.dll",
                     uint16_t(Header->PdbDllVersion));
  else if (Offset < endof(DbiStreamHeader, SymRecordStreamIndex))
    printStructField(P, "the index of the Symbol Record Stream",
                     uint16_t(Header->SymRecordStreamIndex));
  else if (Offset < endof(DbiStreamHeader, PdbDllRbld))
    printStructField(P, "the rbld of mspdb.dll", uint16_t(Header->PdbDllRbld));
  else if (Offset < endof(DbiStreamHeader, ModiSubstreamSize))
    printStructField(P, "the size of the Module Info Substream",
                     int32_t(Header->ModiSubstreamSize));
  else if (Offset < endof(DbiStreamHeader, SecContrSubstreamSize))
    printStructField(P, "the size of the Section Contribution Substream",
                     int32_t(Header->SecContrSubstreamSize));
  else if (Offset < endof(DbiStreamHeader, SectionMapSize))
    printStructField(P, "the size of the Section Map Substream",
                     int32_t(Header->SectionMapSize));
  else if (Offset < endof(DbiStreamHeader, FileInfoSize))
    printStructField(P, "the size of the File Info Substream",
                     int32_t(Header->FileInfoSize));
  else if (Offset < endof(DbiStreamHeader, TypeServerSize))
    printStructField(P, "the size of the Type Server Map",
                     int32_t(Header->TypeServerSize));
  else if (Offset < endof(DbiStreamHeader, MFCTypeServerIndex))
    printStructField(P, "the index of the MFC Type Server stream",
                     uint32_t(Header->MFCTypeServerIndex));
  else if (Offset < endof(DbiStreamHeader, OptionalDbgHdrSize))
    printStructField(P, "the size of the Optional Debug Stream array",
                     int32_t(Header->OptionalDbgHdrSize));
  else if (Offset < endof(DbiStreamHeader, ECSubstreamSize))
    printStructField(P, "the size of the Edit & Continue Substream",
                     int32_t(Header->ECSubstreamSize));
  else if (Offset < endof(DbiStreamHeader, Flags))
    printStructField(P, "the DBI Stream flags", uint16_t(Header->Flags));
  else if (Offset < endof(DbiStreamHeader, MachineType))
    printStructField(P, "the machine type", uint16_t(Header->MachineType));
  else if (Offset < endof(DbiStreamHeader, Reserved))
    printStructField(P, "reserved data", uint32_t(Header->Reserved));
}

static void explainDbiModiSubstreamOffset(LinePrinter &P, DbiStream &Dbi,
                                          uint32_t Offset) {
  VarStreamArray<DbiModuleDescriptor> ModuleDescriptors;
  BinaryStreamRef ModiSubstreamData = Dbi.getModiSubstreamData().StreamData;
  BinaryStreamReader Reader(ModiSubstreamData);

  cantFail(Reader.readArray(ModuleDescriptors, ModiSubstreamData.getLength()));
  auto Prev = ModuleDescriptors.begin();
  assert(Prev.offset() == 0);
  auto Current = Prev;
  uint32_t Index = 0;
  while (true) {
    Prev = Current;
    ++Current;
    if (Current == ModuleDescriptors.end() || Offset < Current.offset())
      break;
    ++Index;
  }

  DbiModuleDescriptor &Descriptor = *Prev;
  P.formatLine("which contains the descriptor for module {0} ({1}).", Index,
               Descriptor.getModuleName());
}

template <typename T>
static void dontExplain(LinePrinter &Printer, T &Stream, uint32_t Offset) {}

template <typename T, typename SubstreamRangeT>
static void explainSubstreamOffset(LinePrinter &P, uint32_t OffsetInStream,
                                   T &Stream,
                                   const SubstreamRangeT &Substreams) {
  uint32_t SubOffset = OffsetInStream;
  for (const auto &Entry : Substreams) {
    if (Entry.Size <= 0)
      continue;
    uint32_t S = static_cast<uint32_t>(Entry.Size);
    if (SubOffset < S) {
      P.formatLine("address is at offset {0}/{1} of the {2}.", SubOffset, S,
                   Entry.Label);
      Entry.Explain(P, Stream, SubOffset);
      return;
    }
    SubOffset -= S;
  }
}

void ExplainOutputStyle::explainStreamOffset(DbiStream &Dbi,
                                             uint32_t OffsetInStream) {
  P.printLine("Within the DBI stream:");
  AutoIndent Indent(P);
  const DbiStreamHeader *Header = Dbi.getHeader();
  assert(Header != nullptr);

  struct SubstreamInfo {
    int32_t Size;
    StringRef Label;
    void (*Explain)(LinePrinter &, DbiStream &, uint32_t);
  } Substreams[] = {
      {sizeof(DbiStreamHeader), "DBI Stream Header", explainDbiHeaderOffset},
      {int32_t(Header->ModiSubstreamSize), "Module Info Substream",
       explainDbiModiSubstreamOffset},
      {int32_t(Header->SecContrSubstreamSize), "Section Contribution Substream",
       dontExplain<DbiStream>},
      {int32_t(Header->SectionMapSize), "Section Map", dontExplain<DbiStream>},
      {int32_t(Header->FileInfoSize), "File Info Substream",
       dontExplain<DbiStream>},
      {int32_t(Header->TypeServerSize), "Type Server Map Substream",
       dontExplain<DbiStream>},
      {int32_t(Header->ECSubstreamSize), "Edit & Continue Substream",
       dontExplain<DbiStream>},
      {int32_t(Header->OptionalDbgHdrSize), "Optional Debug Stream Array",
       dontExplain<DbiStream>},
  };

  explainSubstreamOffset(P, OffsetInStream, Dbi, Substreams);
}

static void explainPdbStreamHeaderOffset(LinePrinter &P, InfoStream &Info,
                                         uint32_t Offset) {
  const InfoStreamHeader *Header = Info.getHeader();
  assert(Header != nullptr);

  if (Offset < endof(InfoStreamHeader, Version))
    printStructField(P, "the PDB Stream Version Signature",
                     uint32_t(Header->Version));
  else if (Offset < endof(InfoStreamHeader, Signature))
    printStructField(P, "the signature of the PDB Stream",
                     uint32_t(Header->Signature));
  else if (Offset < endof(InfoStreamHeader, Age))
    printStructField(P, "the age of the PDB", uint32_t(Header->Age));
  else if (Offset < endof(InfoStreamHeader, Guid))
    printStructField(P, "the guid of the PDB", fmt_guid(Header->Guid.Guid));
}

void ExplainOutputStyle::explainStreamOffset(InfoStream &Info,
                                             uint32_t OffsetInStream) {
  P.printLine("Within the PDB stream:");
  AutoIndent Indent(P);

  struct SubstreamInfo {
    uint32_t Size;
    StringRef Label;
    void (*Explain)(LinePrinter &, InfoStream &, uint32_t);
  } Substreams[] = {{sizeof(InfoStreamHeader), "PDB Stream Header",
                     explainPdbStreamHeaderOffset},
                    {Info.getNamedStreamMapByteSize(), "Named Stream Map",
                     dontExplain<InfoStream>},
                    {Info.getStreamSize(), "PDB Feature Signatures",
                     dontExplain<InfoStream>}};

  explainSubstreamOffset(P, OffsetInStream, Info, Substreams);
}