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