aboutsummaryrefslogtreecommitdiff
path: root/src/processor/source_line_resolver_base.cc
blob: 6eff1f991803fb9c9a22eccd4ed21cbe3751158c (plain)
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
// Copyright (c) 2010 Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// source_line_resolver_base.cc: Implementation of SourceLineResolverBase.
//
// See source_line_resolver_base.h and source_line_resolver_base_types.h for
// more documentation.
//
// Author: Siyang Xie (lambxsy@google.com)

#include <stdio.h>
#include <string.h>
#include <sys/stat.h>

#include <map>
#include <utility>

#include "google_breakpad/processor/source_line_resolver_base.h"
#include "processor/source_line_resolver_base_types.h"
#include "processor/module_factory.h"

using std::map;
using std::make_pair;

namespace google_breakpad {

SourceLineResolverBase::SourceLineResolverBase(
    ModuleFactory *module_factory)
  : modules_(new ModuleMap),
    corrupt_modules_(new ModuleSet),
    memory_buffers_(new MemoryMap),
    module_factory_(module_factory) {
}

SourceLineResolverBase::~SourceLineResolverBase() {
  ModuleMap::iterator it;
  // Iterate through ModuleMap and delete all loaded modules.
  for (it = modules_->begin(); it != modules_->end(); ++it) {
    // Delete individual module.
    delete it->second;
  }
  // Delete the map of modules.
  delete modules_;
  modules_ = NULL;

  // Delete the set of corrupt modules.
  delete corrupt_modules_;
  corrupt_modules_ = NULL;

  MemoryMap::iterator iter = memory_buffers_->begin();
  for (; iter != memory_buffers_->end(); ++iter) {
    delete [] iter->second;
  }
  // Delete the map of memory buffers.
  delete memory_buffers_;
  memory_buffers_ = NULL;

  delete module_factory_;
  module_factory_ = NULL;
}

bool SourceLineResolverBase::ReadSymbolFile(const string &map_file,
                                            char **symbol_data,
                                            size_t *symbol_data_size) {
  if (symbol_data == NULL || symbol_data_size == NULL) {
    BPLOG(ERROR) << "Could not Read file into Null memory pointer";
    return false;
  }

  struct stat buf;
  int error_code = stat(map_file.c_str(), &buf);
  if (error_code == -1) {
    string error_string;
    error_code = ErrnoString(&error_string);
    BPLOG(ERROR) << "Could not open " << map_file <<
        ", error " << error_code << ": " << error_string;
    return false;
  }

  off_t file_size = buf.st_size;

  // Allocate memory for file contents, plus a null terminator
  // since we may use strtok() on the contents.
  *symbol_data_size = file_size + 1;
  *symbol_data = new char[file_size + 1];

  if (*symbol_data == NULL) {
    BPLOG(ERROR) << "Could not allocate memory for " << map_file;
    return false;
  }

  BPLOG(INFO) << "Opening " << map_file;

  FILE *f = fopen(map_file.c_str(), "rt");
  if (!f) {
    string error_string;
    error_code = ErrnoString(&error_string);
    BPLOG(ERROR) << "Could not open " << map_file <<
        ", error " << error_code << ": " << error_string;
    delete [] (*symbol_data);
    *symbol_data = NULL;
    return false;
  }

  AutoFileCloser closer(f);

  int items_read = 0;

  items_read = fread(*symbol_data, 1, file_size, f);

  if (items_read != file_size) {
    string error_string;
    error_code = ErrnoString(&error_string);
    BPLOG(ERROR) << "Could not slurp " << map_file <<
        ", error " << error_code << ": " << error_string;
    delete [] (*symbol_data);
    *symbol_data = NULL;
    return false;
  }

  (*symbol_data)[file_size] = '\0';
  return true;
}

bool SourceLineResolverBase::LoadModule(const CodeModule *module,
                                        const string &map_file) {
  if (module == NULL)
    return false;

  // Make sure we don't already have a module with the given name.
  if (modules_->find(module->code_file()) != modules_->end()) {
    BPLOG(INFO) << "Symbols for module " << module->code_file()
                << " already loaded";
    return false;
  }

  BPLOG(INFO) << "Loading symbols for module " << module->code_file()
              << " from " << map_file;

  char *memory_buffer;
  size_t memory_buffer_size;
  if (!ReadSymbolFile(map_file, &memory_buffer, &memory_buffer_size))
    return false;

  BPLOG(INFO) << "Read symbol file " << map_file << " succeeded";

  bool load_result = LoadModuleUsingMemoryBuffer(module, memory_buffer,
                                                 memory_buffer_size);

  if (load_result && !ShouldDeleteMemoryBufferAfterLoadModule()) {
    // memory_buffer has to stay alive as long as the module.
    memory_buffers_->insert(make_pair(module->code_file(), memory_buffer));
  } else {
    delete [] memory_buffer;
  }

  return load_result;
}

bool SourceLineResolverBase::LoadModuleUsingMapBuffer(
    const CodeModule *module, const string &map_buffer) {
  if (module == NULL)
    return false;

  // Make sure we don't already have a module with the given name.
  if (modules_->find(module->code_file()) != modules_->end()) {
    BPLOG(INFO) << "Symbols for module " << module->code_file()
                << " already loaded";
    return false;
  }

  size_t memory_buffer_size = map_buffer.size() + 1;
  char *memory_buffer = new char[memory_buffer_size];
  if (memory_buffer == NULL) {
    BPLOG(ERROR) << "Could not allocate memory for " << module->code_file();
    return false;
  }

  // Can't use strcpy, as the data may contain '\0's before the end.
  memcpy(memory_buffer, map_buffer.c_str(), map_buffer.size());
  memory_buffer[map_buffer.size()] = '\0';

  bool load_result = LoadModuleUsingMemoryBuffer(module, memory_buffer,
                                                 memory_buffer_size);

  if (load_result && !ShouldDeleteMemoryBufferAfterLoadModule()) {
    // memory_buffer has to stay alive as long as the module.
    memory_buffers_->insert(make_pair(module->code_file(), memory_buffer));
  } else {
    delete [] memory_buffer;
  }

  return load_result;
}

bool SourceLineResolverBase::LoadModuleUsingMemoryBuffer(
    const CodeModule *module,
    char *memory_buffer,
    size_t memory_buffer_size) {
  if (!module)
    return false;

  // Make sure we don't already have a module with the given name.
  if (modules_->find(module->code_file()) != modules_->end()) {
    BPLOG(INFO) << "Symbols for module " << module->code_file()
                << " already loaded";
    return false;
  }

  BPLOG(INFO) << "Loading symbols for module " << module->code_file()
             << " from memory buffer";

  Module *basic_module = module_factory_->CreateModule(module->code_file());

  // Ownership of memory is NOT transfered to Module::LoadMapFromMemory().
  if (!basic_module->LoadMapFromMemory(memory_buffer, memory_buffer_size)) {
    BPLOG(ERROR) << "Too many error while parsing symbol data for module "
                 << module->code_file();
    // Returning false from here would be an indication that the symbols for
    // this module are missing which would be wrong.  Intentionally fall through
    // and add the module to both the modules_ and the corrupt_modules_ lists.
    assert(basic_module->IsCorrupt());
  }

  modules_->insert(make_pair(module->code_file(), basic_module));
  if (basic_module->IsCorrupt()) {
    corrupt_modules_->insert(module->code_file());
  }
  return true;
}

bool SourceLineResolverBase::ShouldDeleteMemoryBufferAfterLoadModule() {
  return true;
}

void SourceLineResolverBase::UnloadModule(const CodeModule *code_module) {
  if (!code_module)
    return;

  ModuleMap::iterator mod_iter = modules_->find(code_module->code_file());
  if (mod_iter != modules_->end()) {
    Module *symbol_module = mod_iter->second;
    delete symbol_module;
    corrupt_modules_->erase(mod_iter->first);
    modules_->erase(mod_iter);
  }

  if (ShouldDeleteMemoryBufferAfterLoadModule()) {
    // No-op.  Because we never store any memory buffers.
  } else {
    // There may be a buffer stored locally, we need to find and delete it.
    MemoryMap::iterator iter = memory_buffers_->find(code_module->code_file());
    if (iter != memory_buffers_->end()) {
      delete [] iter->second;
      memory_buffers_->erase(iter);
    }
  }
}

bool SourceLineResolverBase::HasModule(const CodeModule *module) {
  if (!module)
    return false;
  return modules_->find(module->code_file()) != modules_->end();
}

bool SourceLineResolverBase::IsModuleCorrupt(const CodeModule *module) {
  if (!module)
    return false;
  return corrupt_modules_->find(module->code_file()) != corrupt_modules_->end();
}

void SourceLineResolverBase::FillSourceLineInfo(StackFrame *frame) {
  if (frame->module) {
    ModuleMap::const_iterator it = modules_->find(frame->module->code_file());
    if (it != modules_->end()) {
      it->second->LookupAddress(frame);
    }
  }
}

WindowsFrameInfo *SourceLineResolverBase::FindWindowsFrameInfo(
    const StackFrame *frame) {
  if (frame->module) {
    ModuleMap::const_iterator it = modules_->find(frame->module->code_file());
    if (it != modules_->end()) {
      return it->second->FindWindowsFrameInfo(frame);
    }
  }
  return NULL;
}

CFIFrameInfo *SourceLineResolverBase::FindCFIFrameInfo(
    const StackFrame *frame) {
  if (frame->module) {
    ModuleMap::const_iterator it = modules_->find(frame->module->code_file());
    if (it != modules_->end()) {
      return it->second->FindCFIFrameInfo(frame);
    }
  }
  return NULL;
}

bool SourceLineResolverBase::CompareString::operator()(
    const string &s1, const string &s2) const {
  return strcmp(s1.c_str(), s2.c_str()) < 0;
}

bool SourceLineResolverBase::Module::ParseCFIRuleSet(
    const string &rule_set, CFIFrameInfo *frame_info) const {
  CFIFrameInfoParseHandler handler(frame_info);
  CFIRuleParser parser(&handler);
  return parser.Parse(rule_set);
}

}  // namespace google_breakpad