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// Copyright Antony Polukhin, 2016-2017.
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_STACKTRACE_DETAIL_COLLECT_UNWIND_IPP
#define BOOST_STACKTRACE_DETAIL_COLLECT_UNWIND_IPP
#include <boost/config.hpp>
#ifdef BOOST_HAS_PRAGMA_ONCE
# pragma once
#endif
#include <boost/stacktrace/safe_dump_to.hpp>
#include <unwind.h>
#include <cstdio>
namespace boost { namespace stacktrace { namespace detail {
struct unwind_state {
std::size_t frames_to_skip;
native_frame_ptr_t* current;
native_frame_ptr_t* end;
};
inline _Unwind_Reason_Code unwind_callback(::_Unwind_Context* context, void* arg) {
// Note: do not write `::_Unwind_GetIP` because it is a macro on some platforms.
// Use `_Unwind_GetIP` instead!
unwind_state* const state = static_cast<unwind_state*>(arg);
if (state->frames_to_skip) {
--state->frames_to_skip;
return _Unwind_GetIP(context) ? ::_URC_NO_REASON : ::_URC_END_OF_STACK;
}
*state->current = reinterpret_cast<native_frame_ptr_t>(
_Unwind_GetIP(context)
);
++state->current;
if (!*(state->current - 1) || state->current == state->end) {
return ::_URC_END_OF_STACK;
}
return ::_URC_NO_REASON;
}
std::size_t this_thread_frames::collect(native_frame_ptr_t* out_frames, std::size_t max_frames_count, std::size_t skip) BOOST_NOEXCEPT {
std::size_t frames_count = 0;
if (!max_frames_count) {
return frames_count;
}
boost::stacktrace::detail::unwind_state state = { skip + 1, out_frames, out_frames + max_frames_count };
::_Unwind_Backtrace(&boost::stacktrace::detail::unwind_callback, &state);
frames_count = state.current - out_frames;
if (frames_count && out_frames[frames_count - 1] == 0) {
-- frames_count;
}
return frames_count;
}
}}} // namespace boost::stacktrace::detail
#endif // BOOST_STACKTRACE_DETAIL_COLLECT_UNWIND_IPP
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