Function unwind_callback

memory-hook/src/main/cpp/MemoryHook.cpp:24–35

};

static _Unwind_Reason_Code unwind_callback(struct _Unwind_Context *context, void *data) {
    auto *state = (struct backtrace_stack *) (data);
    uintptr_t pc = _Unwind_GetIP(context);  // 获取 pc 值，即绝对地址
    if (pc) {
        if (state->current == state->end) {
            return _URC_END_OF_STACK;
        } else {
            *state->current++ = (void *) (pc);
        }
    }
    return _URC_NO_REASON;
}

static size_t fill_backtraces_buffer(void **buffer, int max) {
    struct backtrace_stack stack = {buffer, buffer + max};