Re: problem with euc on Win10 64bit AND Mint 32bit
- Posted by SDPringle Oct 08, 2015
- 1631 views
In the case of n=5, we have a temporary getting the value of NOVALUE returned from a function:
(gdb) continue
Continuing.
Breakpoint 1, _1Bin (_n_11027=_n_11027@entry=5, _s_11028=-2130608542) at t_bugmagnet_15a.c:6
6 {
(gdb) n
49 Concat((object_ptr)&_6222, _6221, _s_11028);
(gdb)
6 {
(gdb)
10 object _6222 = NOVALUE;
(gdb)
17 if (!IS_ATOM_INT(_n_11027)) {
(gdb)
24 if (_n_11027 <= 0)
(gdb)
29 _6220 = _2mod(_n_11027, 2);
(gdb) p _6220
$14 = -1073741825
(gdb) n
28 _6219 = _n_11027 >> 1;
(gdb)
29 _6220 = _2mod(_n_11027, 2);
(gdb) p _6220
$15 = -1073741825
Yet if you step into this function gdb reports it returns an integer value
(gdb) s
28 _6219 = _n_11027 >> 1;
(gdb)
29 _6220 = _2mod(_n_11027, 2);
(gdb)
_2mod (_x_477=5, _y_478=_y_478@entry=2) at math.c:241
241 {
(gdb) n
264 _sign_1__tmp_at19_486 = (_y_478 > 0);
(gdb)
265 _sign_2__tmp_at19_487 = (_y_478 < 0);
(gdb)
264 _sign_1__tmp_at19_486 = (_y_478 > 0);
(gdb)
260 _sign_2__tmp_at2_483 = (_x_477 < 0);
(gdb)
259 _sign_1__tmp_at2_482 = (_x_477 > 0);
(gdb)
260 _sign_2__tmp_at2_483 = (_x_477 < 0);
(gdb)
261 _sign_inlined_sign_at_2_481 = _sign_1__tmp_at2_482 - _sign_2__tmp_at2_483;
(gdb)
264 _sign_1__tmp_at19_486 = (_y_478 > 0);
(gdb)
265 _sign_2__tmp_at19_487 = (_y_478 < 0);
(gdb)
266 _sign_inlined_sign_at_19_485 = _sign_1__tmp_at19_486 - _sign_2__tmp_at19_487;
(gdb)
267 if (_sign_inlined_sign_at_2_481 == _sign_inlined_sign_at_19_485)
(gdb)
284 return _154;
(gdb) p _sign_inlined_sign_at_2_481
$16 = 1
(gdb) p _154
$17 = 1
(gdb) n
326 }
(gdb) finish
Run till exit from #0 _2mod (_x_477=5, _y_478=_y_478@entry=2) at math.c:326
_1Bin (_n_11027=<optimized out>, _n_11027@entry=5, _s_11028=-2130608542) at t_bugmagnet_15a.c:31
31 if (IS_ATOM_INT(_6220)) {
Value returned is $18 = 1
(gdb) n
29 _6220 = _2mod(_n_11027, 2);
(gdb) p _6220
$19 = -1073741825
gdb tells me _2mod() returns 1, yet when I inspect the value of the returned variable the value is the same as the special NOVALUE number used to indicate the value has not been assigned.
