Method backtrace

src/backward.h:865–891

    }

    _Unwind_Reason_Code backtrace(_Unwind_Context* ctx)
    {
        if (_index >= 0 && static_cast<size_t>(_index) >= _depth)
            return _URC_END_OF_STACK;

        int ip_before_instruction = 0;
        uintptr_t ip = _Unwind_GetIPInfo(ctx, &ip_before_instruction);

        if (!ip_before_instruction) {
            // calculating 0-1 for unsigned, looks like a possible bug to sanitiziers,
            // so let's do it explicitly:
            if (ip == 0) {
                ip = std::numeric_limits<uintptr_t>::max(); // set it to 0xffff... (as
                                                            // from casting 0-1)
            }
            else {
                ip -= 1; // else just normally decrement it (no overflow/underflow will
                         // happen)
            }
        }

        if (_index >= 0) { // ignore first frame.
            (*_f)(static_cast<size_t>(_index), reinterpret_cast<void*>(ip));
        }
        _index += 1;
        return _URC_NO_REASON;
    }
};

template <typename F>