1 files changed, 68 insertions, 0 deletions
diff --git a/boost/stacktrace/detail/collect_unwind.ipp b/boost/stacktrace/detail/collect_unwind.ipp
new file mode 100644
index 0000000000..3ee4e8f61e
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+++ b/boost/stacktrace/detail/collect_unwind.ipp
@@ -0,0 +1,68 @@
+// 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