DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Header

Mercurial (115a4bcdb596)

VCS Links

Line Code
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
// Copyright (c) 2006, 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.

// basic_code_modules.cc: Contains all of the CodeModule objects that
// were loaded into a single process.
//
// See basic_code_modules.h for documentation.
//
// Author: Mark Mentovai

#include "processor/basic_code_modules.h"

#include <assert.h>

#include <vector>

#include "google_breakpad/processor/code_module.h"
#include "processor/linked_ptr.h"
#include "processor/logging.h"
#include "processor/range_map-inl.h"

namespace google_breakpad {

using std::vector;

BasicCodeModules::BasicCodeModules(const CodeModules *that)
    : main_address_(0), map_() {
  BPLOG_IF(ERROR, !that) << "BasicCodeModules::BasicCodeModules requires "
                            "|that|";
  assert(that);

  map_.SetEnableShrinkDown(that->IsModuleShrinkEnabled());

  const CodeModule *main_module = that->GetMainModule();
  if (main_module)
    main_address_ = main_module->base_address();

  unsigned int count = that->module_count();
  for (unsigned int i = 0; i < count; ++i) {
    // Make a copy of the module and insert it into the map.  Use
    // GetModuleAtIndex because ordering is unimportant when slurping the
    // entire list, and GetModuleAtIndex may be faster than
    // GetModuleAtSequence.
    linked_ptr<const CodeModule> module(that->GetModuleAtIndex(i)->Copy());
    if (!map_.StoreRange(module->base_address(), module->size(), module)) {
      BPLOG(ERROR) << "Module " << module->code_file()
                   << " could not be stored";
    }
  }

  // Report modules with shrunk ranges.
  for (unsigned int i = 0; i < count; ++i) {
    linked_ptr<const CodeModule> module(that->GetModuleAtIndex(i)->Copy());
    uint64_t delta = 0;
    if (map_.RetrieveRange(module->base_address() + module->size() - 1,
                           &module, NULL /* base */, &delta, NULL /* size */) &&
        delta > 0) {
      BPLOG(INFO) << "The range for module " << module->code_file()
                  << " was shrunk down by " << HexString(delta) << " bytes.";
      linked_ptr<CodeModule> shrunk_range_module(module->Copy());
      shrunk_range_module->SetShrinkDownDelta(delta);
      shrunk_range_modules_.push_back(shrunk_range_module);
    }
  }

  // TODO(ivanpe): Report modules with conflicting ranges.  The list of such
  // modules should be copied from |that|.
}

BasicCodeModules::BasicCodeModules() : main_address_(0), map_() { }

BasicCodeModules::~BasicCodeModules() {
}

unsigned int BasicCodeModules::module_count() const {
  return map_.GetCount();
}

const CodeModule* BasicCodeModules::GetModuleForAddress(
    uint64_t address) const {
  linked_ptr<const CodeModule> module;
  if (!map_.RetrieveRange(address, &module, NULL /* base */, NULL /* delta */,
                          NULL /* size */)) {
    BPLOG(INFO) << "No module at " << HexString(address);
    return NULL;
  }

  return module.get();
}

const CodeModule* BasicCodeModules::GetMainModule() const {
  return GetModuleForAddress(main_address_);
}

const CodeModule* BasicCodeModules::GetModuleAtSequence(
    unsigned int sequence) const {
  linked_ptr<const CodeModule> module;
  if (!map_.RetrieveRangeAtIndex(sequence, &module, NULL /* base */,
                                 NULL /* delta */, NULL /* size */)) {
    BPLOG(ERROR) << "RetrieveRangeAtIndex failed for sequence " << sequence;
    return NULL;
  }

  return module.get();
}

const CodeModule* BasicCodeModules::GetModuleAtIndex(
    unsigned int index) const {
  // This class stores everything in a RangeMap, without any more-efficient
  // way to walk the list of CodeModule objects.  Implement GetModuleAtIndex
  // using GetModuleAtSequence, which meets all of the requirements, and
  // in addition, guarantees ordering.
  return GetModuleAtSequence(index);
}

const CodeModules* BasicCodeModules::Copy() const {
  return new BasicCodeModules(this);
}

vector<linked_ptr<const CodeModule> >
BasicCodeModules::GetShrunkRangeModules() const {
  return shrunk_range_modules_;
}

bool BasicCodeModules::IsModuleShrinkEnabled() const {
  return map_.IsShrinkDownEnabled();
}

}  // namespace google_breakpad