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// 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.
// Original author: Jim Blandy <jimb@mozilla.com> <jimb@red-bean.com>
// dwarf_line_to_module.cc: Implementation of DwarfLineToModule class.
// See dwarf_line_to_module.h for details.
#include <stdio.h>
#include <string>
#include "common/dwarf_line_to_module.h"
#include "common/using_std_string.h"
// Trying to support Windows paths in a reasonable way adds a lot of
// variations to test; it would be better to just put off dealing with
// it until we actually have to deal with DWARF on Windows.
// Return true if PATH is an absolute path, false if it is relative.
static bool PathIsAbsolute(const string &path) {
return (path.size() >= 1 && path[0] == '/');
}
static bool HasTrailingSlash(const string &path) {
return (path.size() >= 1 && path[path.size() - 1] == '/');
}
// If PATH is an absolute path, return PATH. If PATH is a relative path,
// treat it as relative to BASE and return the combined path.
static string ExpandPath(const string &path,
const string &base) {
if (PathIsAbsolute(path) || base.empty())
return path;
return base + (HasTrailingSlash(base) ? "" : "/") + path;
}
namespace google_breakpad {
void DwarfLineToModule::DefineDir(const string &name, uint32 dir_num) {
// Directory number zero is reserved to mean the compilation
// directory. Silently ignore attempts to redefine it.
if (dir_num != 0)
directories_[dir_num] = ExpandPath(name, compilation_dir_);
}
void DwarfLineToModule::DefineFile(const string &name, int32 file_num,
uint32 dir_num, uint64 mod_time,
uint64 length) {
if (file_num == -1)
file_num = ++highest_file_number_;
else if (file_num > highest_file_number_)
highest_file_number_ = file_num;
string dir_name;
if (dir_num == 0) {
// Directory number zero is the compilation directory, and is stored as
// an attribute on the compilation unit, rather than in the program table.
dir_name = compilation_dir_;
} else {
DirectoryTable::const_iterator directory_it = directories_.find(dir_num);
if (directory_it != directories_.end()) {
dir_name = directory_it->second;
} else {
if (!warned_bad_directory_number_) {
fprintf(stderr, "warning: DWARF line number data refers to undefined"
" directory numbers\n");
warned_bad_directory_number_ = true;
}
}
}
string full_name = ExpandPath(name, dir_name);
// Find a Module::File object of the given name, and add it to the
// file table.
files_[file_num] = module_->FindFile(full_name);
}
void DwarfLineToModule::AddLine(uint64 address, uint64 length,
uint32 file_num, uint32 line_num,
uint32 column_num) {
if (length == 0)
return;
// Clip lines not to extend beyond the end of the address space.
if (address + length < address)
length = -address;
// Should we omit this line? (See the comments for omitted_line_end_.)
if (address == 0 || address == omitted_line_end_) {
omitted_line_end_ = address + length;
return;
} else {
omitted_line_end_ = 0;
}
// Find the source file being referred to.
Module::File *file = files_[file_num];
if (!file) {
if (!warned_bad_file_number_) {
fprintf(stderr, "warning: DWARF line number data refers to "
"undefined file numbers\n");
warned_bad_file_number_ = true;
}
return;
}
Module::Line line;
line.address = address;
// We set the size when we get the next line or the EndSequence call.
line.size = length;
line.file = file;
line.number = line_num;
lines_->push_back(line);
}
} // namespace google_breakpad