llvm-project

Форк
0
/
sanitizer_symbolizer_mac.cpp 
208 строк · 6.7 Кб
1
//===-- sanitizer_symbolizer_mac.cpp --------------------------------------===//
2
//
3
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4
// See https://llvm.org/LICENSE.txt for license information.
5
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6
//
7
//===----------------------------------------------------------------------===//
8
//
9
// This file is shared between various sanitizers' runtime libraries.
10
//
11
// Implementation of Mac-specific "atos" symbolizer.
12
//===----------------------------------------------------------------------===//
13

14
#include "sanitizer_platform.h"
15
#if SANITIZER_APPLE
16

17
#  include <dlfcn.h>
18
#  include <errno.h>
19
#  include <stdlib.h>
20
#  include <sys/wait.h>
21
#  include <unistd.h>
22
#  include <util.h>
23

24
#  include "sanitizer_allocator_internal.h"
25
#  include "sanitizer_mac.h"
26
#  include "sanitizer_symbolizer_mac.h"
27

28
namespace __sanitizer {
29

30
bool DlAddrSymbolizer::SymbolizePC(uptr addr, SymbolizedStack *stack) {
31
  Dl_info info;
32
  int result = dladdr((const void *)addr, &info);
33
  if (!result) return false;
34

35
  // Compute offset if possible. `dladdr()` doesn't always ensure that `addr >=
36
  // sym_addr` so only compute the offset when this holds. Failure to find the
37
  // function offset is not treated as a failure because it might still be
38
  // possible to get the symbol name.
39
  uptr sym_addr = reinterpret_cast<uptr>(info.dli_saddr);
40
  if (addr >= sym_addr) {
41
    stack->info.function_offset = addr - sym_addr;
42
  }
43

44
  const char *demangled = DemangleSwiftAndCXX(info.dli_sname);
45
  if (!demangled)
46
    demangled = info.dli_sname;
47
  stack->info.function = internal_strdup(demangled);
48
  return true;
49
}
50

51
bool DlAddrSymbolizer::SymbolizeData(uptr addr, DataInfo *datainfo) {
52
  Dl_info info;
53
  int result = dladdr((const void *)addr, &info);
54
  if (!result) return false;
55
  const char *demangled = DemangleSwiftAndCXX(info.dli_sname);
56
  if (!demangled)
57
    demangled = info.dli_sname;
58
  datainfo->name = internal_strdup(demangled);
59
  datainfo->start = (uptr)info.dli_saddr;
60
  return true;
61
}
62

63
class AtosSymbolizerProcess final : public SymbolizerProcess {
64
 public:
65
  explicit AtosSymbolizerProcess(const char *path)
66
      : SymbolizerProcess(path, /*use_posix_spawn*/ true) {
67
    pid_str_[0] = '\0';
68
  }
69

70
 private:
71
  bool StartSymbolizerSubprocess() override {
72
    // Put the string command line argument in the object so that it outlives
73
    // the call to GetArgV.
74
    internal_snprintf(pid_str_, sizeof(pid_str_), "%d", (int)internal_getpid());
75

76
    // Configure sandbox before starting atos process.
77
    return SymbolizerProcess::StartSymbolizerSubprocess();
78
  }
79

80
  bool ReachedEndOfOutput(const char *buffer, uptr length) const override {
81
    return (length >= 1 && buffer[length - 1] == '\n');
82
  }
83

84
  void GetArgV(const char *path_to_binary,
85
               const char *(&argv)[kArgVMax]) const override {
86
    int i = 0;
87
    argv[i++] = path_to_binary;
88
    argv[i++] = "-p";
89
    argv[i++] = &pid_str_[0];
90
    if (GetMacosAlignedVersion() == MacosVersion(10, 9)) {
91
      // On Mavericks atos prints a deprecation warning which we suppress by
92
      // passing -d. The warning isn't present on other OSX versions, even the
93
      // newer ones.
94
      argv[i++] = "-d";
95
    }
96
    argv[i++] = nullptr;
97
    CHECK_LE(i, kArgVMax);
98
  }
99

100
  char pid_str_[16];
101
};
102

103
#undef K_ATOS_ENV_VAR
104

105
static bool ParseCommandOutput(const char *str, uptr addr, char **out_name,
106
                               char **out_module, char **out_file, uptr *line,
107
                               uptr *start_address) {
108
  // Trim ending newlines.
109
  char *trim;
110
  ExtractTokenUpToDelimiter(str, "\n", &trim);
111

112
  // The line from `atos` is in one of these formats:
113
  //   myfunction (in library.dylib) (sourcefile.c:17)
114
  //   myfunction (in library.dylib) + 0x1fe
115
  //   myfunction (in library.dylib) + 15
116
  //   0xdeadbeef (in library.dylib) + 0x1fe
117
  //   0xdeadbeef (in library.dylib) + 15
118
  //   0xdeadbeef (in library.dylib)
119
  //   0xdeadbeef
120

121
  const char *rest = trim;
122
  char *symbol_name;
123
  rest = ExtractTokenUpToDelimiter(rest, " (in ", &symbol_name);
124
  if (rest[0] == '\0') {
125
    InternalFree(symbol_name);
126
    InternalFree(trim);
127
    return false;
128
  }
129

130
  if (internal_strncmp(symbol_name, "0x", 2) != 0)
131
    *out_name = symbol_name;
132
  else
133
    InternalFree(symbol_name);
134
  rest = ExtractTokenUpToDelimiter(rest, ") ", out_module);
135

136
  if (rest[0] == '(') {
137
    if (out_file) {
138
      rest++;
139
      rest = ExtractTokenUpToDelimiter(rest, ":", out_file);
140
      char *extracted_line_number;
141
      rest = ExtractTokenUpToDelimiter(rest, ")", &extracted_line_number);
142
      if (line) *line = (uptr)internal_atoll(extracted_line_number);
143
      InternalFree(extracted_line_number);
144
    }
145
  } else if (rest[0] == '+') {
146
    rest += 2;
147
    uptr offset = internal_atoll(rest);
148
    if (start_address) *start_address = addr - offset;
149
  }
150

151
  InternalFree(trim);
152
  return true;
153
}
154

155
AtosSymbolizer::AtosSymbolizer(const char *path, LowLevelAllocator *allocator)
156
    : process_(new (*allocator) AtosSymbolizerProcess(path)) {}
157

158
bool AtosSymbolizer::SymbolizePC(uptr addr, SymbolizedStack *stack) {
159
  if (!process_) return false;
160
  if (addr == 0) return false;
161
  char command[32];
162
  internal_snprintf(command, sizeof(command), "0x%zx\n", addr);
163
  const char *buf = process_->SendCommand(command);
164
  if (!buf) return false;
165
  uptr line;
166
  uptr start_address = AddressInfo::kUnknown;
167
  if (!ParseCommandOutput(buf, addr, &stack->info.function, &stack->info.module,
168
                          &stack->info.file, &line, &start_address)) {
169
    Report("WARNING: atos failed to symbolize address \"0x%zx\"\n", addr);
170
    return false;
171
  }
172
  stack->info.line = (int)line;
173

174
  if (start_address == AddressInfo::kUnknown) {
175
    // Fallback to dladdr() to get function start address if atos doesn't report
176
    // it.
177
    Dl_info info;
178
    int result = dladdr((const void *)addr, &info);
179
    if (result)
180
      start_address = reinterpret_cast<uptr>(info.dli_saddr);
181
  }
182

183
  // Only assign to `function_offset` if we were able to get the function's
184
  // start address and we got a sensible `start_address` (dladdr doesn't always
185
  // ensure that `addr >= sym_addr`).
186
  if (start_address != AddressInfo::kUnknown && addr >= start_address) {
187
    stack->info.function_offset = addr - start_address;
188
  }
189
  return true;
190
}
191

192
bool AtosSymbolizer::SymbolizeData(uptr addr, DataInfo *info) {
193
  if (!process_) return false;
194
  char command[32];
195
  internal_snprintf(command, sizeof(command), "0x%zx\n", addr);
196
  const char *buf = process_->SendCommand(command);
197
  if (!buf) return false;
198
  if (!ParseCommandOutput(buf, addr, &info->name, &info->module, nullptr,
199
                          nullptr, &info->start)) {
200
    process_ = nullptr;
201
    return false;
202
  }
203
  return true;
204
}
205

206
}  // namespace __sanitizer
207

208
#endif  // SANITIZER_APPLE
209

Использование cookies

Мы используем файлы cookie в соответствии с Политикой конфиденциальности и Политикой использования cookies.

Нажимая кнопку «Принимаю», Вы даете АО «СберТех» согласие на обработку Ваших персональных данных в целях совершенствования нашего веб-сайта и Сервиса GitVerse, а также повышения удобства их использования.

Запретить использование cookies Вы можете самостоятельно в настройках Вашего браузера.