backtrace.c: small refactoring in `mrb_exc_backtrace()`; ref
add comment for unpacking
avoid saving the symbol in a local variable
@@ -224,16 +224,15 @@ mrb_unpack_backtrace(mrb_state *mrb, mrb_value backtrace)
MRB_API mrb_value
mrb_exc_backtrace(mrb_state *mrb, mrb_value exc)
{
- mrb_sym attr_name;
mrb_value backtrace;
- attr_name = MRB_SYM(backtrace);
- backtrace = mrb_iv_get(mrb, exc, attr_name);
+ backtrace = mrb_iv_get(mrb, exc, MRB_SYM(backtrace));
if (mrb_nil_p(backtrace) || mrb_array_p(backtrace)) {
return backtrace;
}
+ /* unpack packed-backtrace */
backtrace = mrb_unpack_backtrace(mrb, backtrace);
- mrb_iv_set(mrb, exc, attr_name, backtrace);
+ mrb_iv_set(mrb, exc, MRB_SYM(backtrace), backtrace);
return backtrace;
}
