aboutsummaryrefslogtreecommitdiffstats
path: root/source/Plugins/ObjectFile/Breakpad/BreakpadRecords.cpp
blob: de17d986a8608c8aad445d0b289c4b15f705b8b8 (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
//===-- BreakpadRecords.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 "Plugins/ObjectFile/Breakpad/BreakpadRecords.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/FormatVariadic.h"

using namespace lldb_private;
using namespace lldb_private::breakpad;

namespace {
enum class Token {
  Unknown,
  Module,
  Info,
  CodeID,
  File,
  Func,
  Public,
  Stack,
  CFI,
  Init,
  Win,
};
}

template<typename T>
static T stringTo(llvm::StringRef Str);

template <> Token stringTo<Token>(llvm::StringRef Str) {
  return llvm::StringSwitch<Token>(Str)
      .Case("MODULE", Token::Module)
      .Case("INFO", Token::Info)
      .Case("CODE_ID", Token::CodeID)
      .Case("FILE", Token::File)
      .Case("FUNC", Token::Func)
      .Case("PUBLIC", Token::Public)
      .Case("STACK", Token::Stack)
      .Case("CFI", Token::CFI)
      .Case("INIT", Token::Init)
      .Case("WIN", Token::Win)
      .Default(Token::Unknown);
}

template <>
llvm::Triple::OSType stringTo<llvm::Triple::OSType>(llvm::StringRef Str) {
  using llvm::Triple;
  return llvm::StringSwitch<Triple::OSType>(Str)
      .Case("Linux", Triple::Linux)
      .Case("mac", Triple::MacOSX)
      .Case("windows", Triple::Win32)
      .Default(Triple::UnknownOS);
}

template <>
llvm::Triple::ArchType stringTo<llvm::Triple::ArchType>(llvm::StringRef Str) {
  using llvm::Triple;
  return llvm::StringSwitch<Triple::ArchType>(Str)
      .Case("arm", Triple::arm)
      .Cases("arm64", "arm64e", Triple::aarch64)
      .Case("mips", Triple::mips)
      .Case("ppc", Triple::ppc)
      .Case("ppc64", Triple::ppc64)
      .Case("s390", Triple::systemz)
      .Case("sparc", Triple::sparc)
      .Case("sparcv9", Triple::sparcv9)
      .Case("x86", Triple::x86)
      .Case("x86_64", Triple::x86_64)
      .Default(Triple::UnknownArch);
}

template<typename T>
static T consume(llvm::StringRef &Str) {
  llvm::StringRef Token;
  std::tie(Token, Str) = getToken(Str);
  return stringTo<T>(Token);
}

/// Return the number of hex digits needed to encode an (POD) object of a given
/// type.
template <typename T> static constexpr size_t hex_digits() {
  return 2 * sizeof(T);
}

static UUID parseModuleId(llvm::Triple::OSType os, llvm::StringRef str) {
  struct data_t {
    using uuid_t = uint8_t[16];
    uuid_t uuid;
    llvm::support::ubig32_t age;
  } data;
  static_assert(sizeof(data) == 20, "");
  // The textual module id encoding should be between 33 and 40 bytes long,
  // depending on the size of the age field, which is of variable length.
  // The first three chunks of the id are encoded in big endian, so we need to
  // byte-swap those.
  if (str.size() <= hex_digits<data_t::uuid_t>() ||
      str.size() > hex_digits<data_t>())
    return UUID();
  if (!all_of(str, llvm::isHexDigit))
    return UUID();

  llvm::StringRef uuid_str = str.take_front(hex_digits<data_t::uuid_t>());
  llvm::StringRef age_str = str.drop_front(hex_digits<data_t::uuid_t>());

  llvm::copy(fromHex(uuid_str), data.uuid);
  uint32_t age;
  bool success = to_integer(age_str, age, 16);
  assert(success);
  (void)success;
  data.age = age;

  // On non-windows, the age field should always be zero, so we don't include to
  // match the native uuid format of these platforms.
  return UUID::fromData(&data, os == llvm::Triple::Win32 ? sizeof(data)
                                                         : sizeof(data.uuid));
}

llvm::Optional<Record::Kind> Record::classify(llvm::StringRef Line) {
  Token Tok = consume<Token>(Line);
  switch (Tok) {
  case Token::Module:
    return Record::Module;
  case Token::Info:
    return Record::Info;
  case Token::File:
    return Record::File;
  case Token::Func:
    return Record::Func;
  case Token::Public:
    return Record::Public;
  case Token::Stack:
    Tok = consume<Token>(Line);
    switch (Tok) {
    case Token::CFI:
      return Record::StackCFI;
    case Token::Win:
      return Record::StackWin;
    default:
      return llvm::None;
    }

  case Token::Unknown:
    // Optimistically assume that any unrecognised token means this is a line
    // record, those don't have a special keyword and start directly with a
    // hex number.
    return Record::Line;

  case Token::CodeID:
  case Token::CFI:
  case Token::Init:
  case Token::Win:
    // These should never appear at the start of a valid record.
    return llvm::None;
  }
  llvm_unreachable("Fully covered switch above!");
}

llvm::Optional<ModuleRecord> ModuleRecord::parse(llvm::StringRef Line) {
  // MODULE Linux x86_64 E5894855C35DCCCCCCCCCCCCCCCCCCCC0 a.out
  if (consume<Token>(Line) != Token::Module)
    return llvm::None;

  llvm::Triple::OSType OS = consume<llvm::Triple::OSType>(Line);
  if (OS == llvm::Triple::UnknownOS)
    return llvm::None;

  llvm::Triple::ArchType Arch = consume<llvm::Triple::ArchType>(Line);
  if (Arch == llvm::Triple::UnknownArch)
    return llvm::None;

  llvm::StringRef Str;
  std::tie(Str, Line) = getToken(Line);
  UUID ID = parseModuleId(OS, Str);
  if (!ID)
    return llvm::None;

  return ModuleRecord(OS, Arch, std::move(ID));
}

llvm::raw_ostream &breakpad::operator<<(llvm::raw_ostream &OS,
                                        const ModuleRecord &R) {
  return OS << "MODULE " << llvm::Triple::getOSTypeName(R.OS) << " "
            << llvm::Triple::getArchTypeName(R.Arch) << " "
            << R.ID.GetAsString();
}

llvm::Optional<InfoRecord> InfoRecord::parse(llvm::StringRef Line) {
  // INFO CODE_ID 554889E55DC3CCCCCCCCCCCCCCCCCCCC [a.exe]
  if (consume<Token>(Line) != Token::Info)
    return llvm::None;

  if (consume<Token>(Line) != Token::CodeID)
    return llvm::None;

  llvm::StringRef Str;
  std::tie(Str, Line) = getToken(Line);
  // If we don't have any text following the code ID (e.g. on linux), we should
  // use this as the UUID. Otherwise, we should revert back to the module ID.
  UUID ID;
  if (Line.trim().empty()) {
    if (Str.empty() || ID.SetFromStringRef(Str, Str.size() / 2) != Str.size())
      return llvm::None;
  }
  return InfoRecord(std::move(ID));
}

llvm::raw_ostream &breakpad::operator<<(llvm::raw_ostream &OS,
                                        const InfoRecord &R) {
  return OS << "INFO CODE_ID " << R.ID.GetAsString();
}

llvm::Optional<FileRecord> FileRecord::parse(llvm::StringRef Line) {
  // FILE number name
  if (consume<Token>(Line) != Token::File)
    return llvm::None;

  llvm::StringRef Str;
  size_t Number;
  std::tie(Str, Line) = getToken(Line);
  if (!to_integer(Str, Number))
    return llvm::None;

  llvm::StringRef Name = Line.trim();
  if (Name.empty())
    return llvm::None;

  return FileRecord(Number, Name);
}

llvm::raw_ostream &breakpad::operator<<(llvm::raw_ostream &OS,
                                        const FileRecord &R) {
  return OS << "FILE " << R.Number << " " << R.Name;
}

static bool parsePublicOrFunc(llvm::StringRef Line, bool &Multiple,
                              lldb::addr_t &Address, lldb::addr_t *Size,
                              lldb::addr_t &ParamSize, llvm::StringRef &Name) {
  // PUBLIC [m] address param_size name
  // or
  // FUNC [m] address size param_size name

  Token Tok = Size ? Token::Func : Token::Public;

  if (consume<Token>(Line) != Tok)
    return false;

  llvm::StringRef Str;
  std::tie(Str, Line) = getToken(Line);
  Multiple = Str == "m";

  if (Multiple)
    std::tie(Str, Line) = getToken(Line);
  if (!to_integer(Str, Address, 16))
    return false;

  if (Tok == Token::Func) {
    std::tie(Str, Line) = getToken(Line);
    if (!to_integer(Str, *Size, 16))
      return false;
  }

  std::tie(Str, Line) = getToken(Line);
  if (!to_integer(Str, ParamSize, 16))
    return false;

  Name = Line.trim();
  if (Name.empty())
    return false;

  return true;
}

llvm::Optional<FuncRecord> FuncRecord::parse(llvm::StringRef Line) {
  bool Multiple;
  lldb::addr_t Address, Size, ParamSize;
  llvm::StringRef Name;

  if (parsePublicOrFunc(Line, Multiple, Address, &Size, ParamSize, Name))
    return FuncRecord(Multiple, Address, Size, ParamSize, Name);

  return llvm::None;
}

bool breakpad::operator==(const FuncRecord &L, const FuncRecord &R) {
  return L.Multiple == R.Multiple && L.Address == R.Address &&
         L.Size == R.Size && L.ParamSize == R.ParamSize && L.Name == R.Name;
}
llvm::raw_ostream &breakpad::operator<<(llvm::raw_ostream &OS,
                                        const FuncRecord &R) {
  return OS << llvm::formatv("FUNC {0}{1:x-} {2:x-} {3:x-} {4}",
                             R.Multiple ? "m " : "", R.Address, R.Size,
                             R.ParamSize, R.Name);
}

llvm::Optional<LineRecord> LineRecord::parse(llvm::StringRef Line) {
  lldb::addr_t Address;
  llvm::StringRef Str;
  std::tie(Str, Line) = getToken(Line);
  if (!to_integer(Str, Address, 16))
    return llvm::None;

  lldb::addr_t Size;
  std::tie(Str, Line) = getToken(Line);
  if (!to_integer(Str, Size, 16))
    return llvm::None;

  uint32_t LineNum;
  std::tie(Str, Line) = getToken(Line);
  if (!to_integer(Str, LineNum))
    return llvm::None;

  size_t FileNum;
  std::tie(Str, Line) = getToken(Line);
  if (!to_integer(Str, FileNum))
    return llvm::None;

  return LineRecord(Address, Size, LineNum, FileNum);
}

bool breakpad::operator==(const LineRecord &L, const LineRecord &R) {
  return L.Address == R.Address && L.Size == R.Size && L.LineNum == R.LineNum &&
         L.FileNum == R.FileNum;
}
llvm::raw_ostream &breakpad::operator<<(llvm::raw_ostream &OS,
                                        const LineRecord &R) {
  return OS << llvm::formatv("{0:x-} {1:x-} {2} {3}", R.Address, R.Size,
                             R.LineNum, R.FileNum);
}

llvm::Optional<PublicRecord> PublicRecord::parse(llvm::StringRef Line) {
  bool Multiple;
  lldb::addr_t Address, ParamSize;
  llvm::StringRef Name;

  if (parsePublicOrFunc(Line, Multiple, Address, nullptr, ParamSize, Name))
    return PublicRecord(Multiple, Address, ParamSize, Name);

  return llvm::None;
}

bool breakpad::operator==(const PublicRecord &L, const PublicRecord &R) {
  return L.Multiple == R.Multiple && L.Address == R.Address &&
         L.ParamSize == R.ParamSize && L.Name == R.Name;
}
llvm::raw_ostream &breakpad::operator<<(llvm::raw_ostream &OS,
                                        const PublicRecord &R) {
  return OS << llvm::formatv("PUBLIC {0}{1:x-} {2:x-} {3}",
                             R.Multiple ? "m " : "", R.Address, R.ParamSize,
                             R.Name);
}

llvm::Optional<StackCFIRecord> StackCFIRecord::parse(llvm::StringRef Line) {
  // STACK CFI INIT address size reg1: expr1 reg2: expr2 ...
  // or
  // STACK CFI address reg1: expr1 reg2: expr2 ...
  // No token in exprN ends with a colon.

  if (consume<Token>(Line) != Token::Stack)
    return llvm::None;
  if (consume<Token>(Line) != Token::CFI)
    return llvm::None;

  llvm::StringRef Str;
  std::tie(Str, Line) = getToken(Line);

  bool IsInitRecord = stringTo<Token>(Str) == Token::Init;
  if (IsInitRecord)
    std::tie(Str, Line) = getToken(Line);

  lldb::addr_t Address;
  if (!to_integer(Str, Address, 16))
    return llvm::None;

  llvm::Optional<lldb::addr_t> Size;
  if (IsInitRecord) {
    Size.emplace();
    std::tie(Str, Line) = getToken(Line);
    if (!to_integer(Str, *Size, 16))
      return llvm::None;
  }

  return StackCFIRecord(Address, Size, Line.trim());
}

bool breakpad::operator==(const StackCFIRecord &L, const StackCFIRecord &R) {
  return L.Address == R.Address && L.Size == R.Size &&
         L.UnwindRules == R.UnwindRules;
}

llvm::raw_ostream &breakpad::operator<<(llvm::raw_ostream &OS,
                                        const StackCFIRecord &R) {
  OS << "STACK CFI ";
  if (R.Size)
    OS << "INIT ";
  OS << llvm::formatv("{0:x-} ", R.Address);
  if (R.Size)
    OS << llvm::formatv("{0:x-} ", *R.Size);
  return OS << " " << R.UnwindRules;
}

llvm::Optional<StackWinRecord> StackWinRecord::parse(llvm::StringRef Line) {
  // STACK WIN type rva code_size prologue_size epilogue_size parameter_size
  //     saved_register_size local_size max_stack_size has_program_string
  //     program_string_OR_allocates_base_pointer

  if (consume<Token>(Line) != Token::Stack)
    return llvm::None;
  if (consume<Token>(Line) != Token::Win)
    return llvm::None;

  llvm::StringRef Str;
  uint8_t Type;
  std::tie(Str, Line) = getToken(Line);
  // Right now we only support the "FrameData" frame type.
  if (!to_integer(Str, Type) || FrameType(Type) != FrameType::FrameData)
    return llvm::None;

  lldb::addr_t RVA;
  std::tie(Str, Line) = getToken(Line);
  if (!to_integer(Str, RVA, 16))
    return llvm::None;

  lldb::addr_t CodeSize;
  std::tie(Str, Line) = getToken(Line);
  if (!to_integer(Str, CodeSize, 16))
    return llvm::None;

  // Skip fields which we aren't using right now.
  std::tie(Str, Line) = getToken(Line); // prologue_size
  std::tie(Str, Line) = getToken(Line); // epilogue_size

  lldb::addr_t ParameterSize;
  std::tie(Str, Line) = getToken(Line);
  if (!to_integer(Str, ParameterSize, 16))
    return llvm::None;

  lldb::addr_t SavedRegisterSize;
  std::tie(Str, Line) = getToken(Line);
  if (!to_integer(Str, SavedRegisterSize, 16))
    return llvm::None;

  lldb::addr_t LocalSize;
  std::tie(Str, Line) = getToken(Line);
  if (!to_integer(Str, LocalSize, 16))
    return llvm::None;

  std::tie(Str, Line) = getToken(Line); // max_stack_size

  uint8_t HasProgramString;
  std::tie(Str, Line) = getToken(Line);
  if (!to_integer(Str, HasProgramString))
    return llvm::None;
  // FrameData records should always have a program string.
  if (!HasProgramString)
    return llvm::None;

  return StackWinRecord(RVA, CodeSize, ParameterSize, SavedRegisterSize,
                        LocalSize, Line.trim());
}

bool breakpad::operator==(const StackWinRecord &L, const StackWinRecord &R) {
  return L.RVA == R.RVA && L.CodeSize == R.CodeSize &&
         L.ParameterSize == R.ParameterSize &&
         L.SavedRegisterSize == R.SavedRegisterSize &&
         L.LocalSize == R.LocalSize && L.ProgramString == R.ProgramString;
}

llvm::raw_ostream &breakpad::operator<<(llvm::raw_ostream &OS,
                                        const StackWinRecord &R) {
  return OS << llvm::formatv(
             "STACK WIN 4 {0:x-} {1:x-} ? ? {2} {3} {4} ? 1 {5}", R.RVA,
             R.CodeSize, R.ParameterSize, R.SavedRegisterSize, R.LocalSize,
             R.ProgramString);
}

llvm::StringRef breakpad::toString(Record::Kind K) {
  switch (K) {
  case Record::Module:
    return "MODULE";
  case Record::Info:
    return "INFO";
  case Record::File:
    return "FILE";
  case Record::Func:
    return "FUNC";
  case Record::Line:
    return "LINE";
  case Record::Public:
    return "PUBLIC";
  case Record::StackCFI:
    return "STACK CFI";
  case Record::StackWin:
    return "STACK WIN";
  }
  llvm_unreachable("Unknown record kind!");
}