1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/toolkit/crashreporter/google-breakpad/src/common/dwarf_line_to_module.cc Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,142 @@
1.4 +// Copyright (c) 2010 Google Inc.
1.5 +// All rights reserved.
1.6 +//
1.7 +// Redistribution and use in source and binary forms, with or without
1.8 +// modification, are permitted provided that the following conditions are
1.9 +// met:
1.10 +//
1.11 +// * Redistributions of source code must retain the above copyright
1.12 +// notice, this list of conditions and the following disclaimer.
1.13 +// * Redistributions in binary form must reproduce the above
1.14 +// copyright notice, this list of conditions and the following disclaimer
1.15 +// in the documentation and/or other materials provided with the
1.16 +// distribution.
1.17 +// * Neither the name of Google Inc. nor the names of its
1.18 +// contributors may be used to endorse or promote products derived from
1.19 +// this software without specific prior written permission.
1.20 +//
1.21 +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
1.22 +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
1.23 +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
1.24 +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
1.25 +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
1.26 +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
1.27 +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
1.28 +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
1.29 +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
1.30 +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
1.31 +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.32 +
1.33 +// Original author: Jim Blandy <jimb@mozilla.com> <jimb@red-bean.com>
1.34 +
1.35 +// dwarf_line_to_module.cc: Implementation of DwarfLineToModule class.
1.36 +// See dwarf_line_to_module.h for details.
1.37 +
1.38 +#include <string>
1.39 +
1.40 +#include "common/dwarf_line_to_module.h"
1.41 +#include "common/using_std_string.h"
1.42 +#include "common/logging.h"
1.43 +
1.44 +// Trying to support Windows paths in a reasonable way adds a lot of
1.45 +// variations to test; it would be better to just put off dealing with
1.46 +// it until we actually have to deal with DWARF on Windows.
1.47 +
1.48 +// Return true if PATH is an absolute path, false if it is relative.
1.49 +static bool PathIsAbsolute(const string &path) {
1.50 + return (path.size() >= 1 && path[0] == '/');
1.51 +}
1.52 +
1.53 +static bool HasTrailingSlash(const string &path) {
1.54 + return (path.size() >= 1 && path[path.size() - 1] == '/');
1.55 +}
1.56 +
1.57 +// If PATH is an absolute path, return PATH. If PATH is a relative path,
1.58 +// treat it as relative to BASE and return the combined path.
1.59 +static string ExpandPath(const string &path,
1.60 + const string &base) {
1.61 + if (PathIsAbsolute(path) || base.empty())
1.62 + return path;
1.63 + return base + (HasTrailingSlash(base) ? "" : "/") + path;
1.64 +}
1.65 +
1.66 +namespace google_breakpad {
1.67 +
1.68 +void DwarfLineToModule::DefineDir(const string &name, uint32 dir_num) {
1.69 + // Directory number zero is reserved to mean the compilation
1.70 + // directory. Silently ignore attempts to redefine it.
1.71 + if (dir_num != 0)
1.72 + directories_[dir_num] = ExpandPath(name, compilation_dir_);
1.73 +}
1.74 +
1.75 +void DwarfLineToModule::DefineFile(const string &name, int32 file_num,
1.76 + uint32 dir_num, uint64 mod_time,
1.77 + uint64 length) {
1.78 + if (file_num == -1)
1.79 + file_num = ++highest_file_number_;
1.80 + else if (file_num > highest_file_number_)
1.81 + highest_file_number_ = file_num;
1.82 +
1.83 + string dir_name;
1.84 + if (dir_num == 0) {
1.85 + // Directory number zero is the compilation directory, and is stored as
1.86 + // an attribute on the compilation unit, rather than in the program table.
1.87 + dir_name = compilation_dir_;
1.88 + } else {
1.89 + DirectoryTable::const_iterator directory_it = directories_.find(dir_num);
1.90 + if (directory_it != directories_.end()) {
1.91 + dir_name = directory_it->second;
1.92 + } else {
1.93 + if (!warned_bad_directory_number_) {
1.94 + BPLOG(INFO) << "warning: DWARF line number data refers to undefined"
1.95 + << " directory numbers";
1.96 + warned_bad_directory_number_ = true;
1.97 + }
1.98 + }
1.99 + }
1.100 +
1.101 + string full_name = ExpandPath(name, dir_name);
1.102 +
1.103 + // Find a Module::File object of the given name, and add it to the
1.104 + // file table.
1.105 + files_[file_num] = module_->FindFile(full_name);
1.106 +}
1.107 +
1.108 +void DwarfLineToModule::AddLine(uint64 address, uint64 length,
1.109 + uint32 file_num, uint32 line_num,
1.110 + uint32 column_num) {
1.111 + if (length == 0)
1.112 + return;
1.113 +
1.114 + // Clip lines not to extend beyond the end of the address space.
1.115 + if (address + length < address)
1.116 + length = -address;
1.117 +
1.118 + // Should we omit this line? (See the comments for omitted_line_end_.)
1.119 + if (address == 0 || address == omitted_line_end_) {
1.120 + omitted_line_end_ = address + length;
1.121 + return;
1.122 + } else {
1.123 + omitted_line_end_ = 0;
1.124 + }
1.125 +
1.126 + // Find the source file being referred to.
1.127 + Module::File *file = files_[file_num];
1.128 + if (!file) {
1.129 + if (!warned_bad_file_number_) {
1.130 + BPLOG(INFO) << "warning: DWARF line number data refers to "
1.131 + << "undefined file numbers";
1.132 + warned_bad_file_number_ = true;
1.133 + }
1.134 + return;
1.135 + }
1.136 + Module::Line line;
1.137 + line.address = address;
1.138 + // We set the size when we get the next line or the EndSequence call.
1.139 + line.size = length;
1.140 + line.file = file;
1.141 + line.number = line_num;
1.142 + lines_->push_back(line);
1.143 +}
1.144 +
1.145 +} // namespace google_breakpad
