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Added an option to use libc backtrace function from execinfo.h #70

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Merged
apolukhin merged 3 commits into from
Jan 11, 2019
Merged

Added an option to use libc backtrace function from execinfo.h #70

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1b7956a
Added an ability to use libc backtrace() function (from execinfo.h) i…
ivanarh Jan 7, 2019
411d92c
Forced backtrace() function usage on iOS, 32-bit ARM architecture. Us…
ivanarh Jan 9, 2019
839a1a1
Update collect_unwind.ipp
apolukhin Jan 11, 2019
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35 changes: 33 additions & 2 deletions include/boost/stacktrace/detail/collect_unwind.ipp
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Original file line number Diff line number Diff line change
Expand Up @@ -14,7 +14,19 @@

#include <boost/stacktrace/safe_dump_to.hpp>

// On iOS 32-bit ARM architecture _Unwind_Backtrace function doesn't exist, symbol is undefined.
// Forcing libc backtrace() function usage.
#include <boost/predef.h>
#if defined(BOOST_OS_IOS_AVAILABLE) && defined(BOOST_ARCH_ARM_AVAILABLE) && BOOST_VERSION_NUMBER_MAJOR(BOOST_ARCH_ARM) < 8
#define BOOST_STACKTRACE_USE_LIBC_BACKTRACE_FUNCTION
#endif

#if defined(BOOST_STACKTRACE_USE_LIBC_BACKTRACE_FUNCTION)
#include <execinfo.h>
#include <algorithm>
#else
#include <unwind.h>
#endif
#include <cstdio>

#if !defined(_GNU_SOURCE) && !defined(BOOST_STACKTRACE_GNU_SOURCE_NOT_REQUIRED) && !defined(BOOST_WINDOWS)
Expand All @@ -23,6 +35,7 @@

namespace boost { namespace stacktrace { namespace detail {

#if !defined(BOOST_STACKTRACE_USE_LIBC_BACKTRACE_FUNCTION)
struct unwind_state {
std::size_t frames_to_skip;
native_frame_ptr_t* current;
Expand All @@ -48,16 +61,32 @@ inline _Unwind_Reason_Code unwind_callback(::_Unwind_Context* context, void* arg
}
return ::_URC_NO_REASON;
}
#endif //!defined(BOOST_STACKTRACE_USE_LIBC_BACKTRACE_FUNCTION)

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 };
skip += 1;

#if defined(BOOST_STACKTRACE_USE_LIBC_BACKTRACE_FUNCTION)
frames_count = static_cast<size_t>(::backtrace(const_cast<void **>(out_frames), static_cast<int>(max_frames_count)));
// NOTE: There is no way to pass "skip" count to backtrace function so we need to perform left shift operation.
// If number of elements in result backtrace is >= max_frames_count then "skip" elements are wasted.
if (frames_count && skip) {
if (skip >= frames_count) {
frames_count = 0;
} else {
std::copy(out_frames + skip, out_frames + frames_count, out_frames);
frames_count -= skip;
}
}
#else
boost::stacktrace::detail::unwind_state state = { skip, out_frames, out_frames + max_frames_count };
::_Unwind_Backtrace(&boost::stacktrace::detail::unwind_callback, &state);
frames_count = state.current - out_frames;
#endif //defined(BOOST_STACKTRACE_USE_LIBC_BACKTRACE_FUNCTION)

if (frames_count && out_frames[frames_count - 1] == 0) {
-- frames_count;
Expand All @@ -69,4 +98,6 @@ std::size_t this_thread_frames::collect(native_frame_ptr_t* out_frames, std::siz

}}} // namespace boost::stacktrace::detail

#undef BOOST_STACKTRACE_USE_LIBC_BACKTRACE_FUNCTION

#endif // BOOST_STACKTRACE_DETAIL_COLLECT_UNWIND_IPP