libcruft-util/backtrace_execinfo.cpp

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/*
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* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
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*
* Copyright 2010-2014 Danny Robson <danny@nerdcruft.net>
*/
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#include "backtrace.hpp"
#include "./debug.hpp"
#include "./exe.hpp"
#include "./io.hpp"
#include "./cast.hpp"
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#include <sstream>
#include <iomanip>
#include <cstdio>
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#include <cstdlib>
#include <execinfo.h>
#include <algorithm>
#include <memory>
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///////////////////////////////////////////////////////////////////////////////
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debug::backtrace::backtrace (void):
m_frames (DEFAULT_DEPTH)
{
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size_t last;
size_t size = m_frames.size ();
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while ((last = ::backtrace (&m_frames[0], trunc_cast<int> (m_frames.size ()))) == size)
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m_frames.resize (size = m_frames.size () * 2);
CHECK_GT (last, 0u);
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m_frames.resize (last);
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}
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///////////////////////////////////////////////////////////////////////////////
static std::string
addr2line (const void *addr)
{
#if defined(ADDR2LINE)
using pstream_t = std::unique_ptr<FILE,decltype(&::pclose)>;
std::ostringstream cmd;
cmd << ADDR2LINE << " -e " << util::image_path () << ' ' << std::hex << addr;
pstream_t stream (
::popen (cmd.str ().c_str (), "r"),
::pclose
);
// inefficient to copy from vector to string, but it's not a high priority path
auto data = util::slurp (stream.get ());
return std::string (data.cbegin (), data.cend ());
#else
return "";
#endif
}
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///////////////////////////////////////////////////////////////////////////////
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std::ostream&
debug::operator <<(std::ostream &os, const debug::backtrace &rhs) {
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const auto frames = rhs.frames ();
// We don't use the array form of unique_ptr as clang fails on ambigious constructors
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typedef std::unique_ptr<char *, decltype(&std::free)> str_t;
str_t names (backtrace_symbols (frames.data (), trunc_cast<int> (frames.size ())), ::free);
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for (unsigned int i = 0; i < frames.size (); ++i)
os << frames[i] << '\t' << names.get()[i] << '\t' << addr2line (frames[i]);
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return os;
}