void StackAnalyzer::get_symbols(std::function<void (const backtrace_symbol *)> cb, bool reversed) const {
info_cb_data_t info_cb_data;
for (void *pc : this->stack_addrs) {
info_cb_data.pc = reinterpret_cast<uintptr_t>(pc);
// note: a call to backtrace_pcinfo may, in semi-rare cases, push back
// multiple symbols to result. That's nothing to worry about, though.
// If you decide you don't like it, make pcinfo_callback return 1.
backtrace_pcinfo(
bt_state,
info_cb_data.pc,
backtrace_pcinfo_callback,
backtrace_pcinfo_error_callback,
reinterpret_cast<void *>(&info_cb_data)
);
}
if (reversed) {
// this entire vector thing would only be needed for reversed=true...
for (size_t idx = info_cb_data.symbols.size(); idx-- > 0;) {
cb(&info_cb_data.symbols[idx]);
}
} else {
for (backtrace_symbol &symbol : info_cb_data.symbols) {
cb(&symbol);
}
}
}
static _Unwind_Reason_Code
unwind (struct _Unwind_Context *context, void *vdata)
{
struct backtrace_data *bdata = (struct backtrace_data *) vdata;
uintptr_t pc;
int ip_before_insn = 0;
#ifdef HAVE_GETIPINFO
pc = _Unwind_GetIPInfo (context, &ip_before_insn);
#else
pc = _Unwind_GetIP (context);
#endif
if (bdata->skip > 0)
{
--bdata->skip;
return _URC_NO_REASON;
}
if (!ip_before_insn)
--pc;
if (!bdata->can_alloc)
bdata->ret = bdata->callback (bdata->data, pc, NULL, 0, NULL);
else
bdata->ret = backtrace_pcinfo (bdata->state, pc, bdata->callback,
bdata->error_callback, bdata->data);
if (bdata->ret != 0)
return _URC_END_OF_STACK;
return _URC_NO_REASON;
}
