* output-radix breaks char output
@ 2011-11-08 4:39 Mike Frysinger
2011-11-08 15:13 ` Pedro Alves
2011-11-08 17:04 ` Tom Tromey
0 siblings, 2 replies; 4+ messages in thread
From: Mike Frysinger @ 2011-11-08 4:39 UTC (permalink / raw)
To: gdb
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am i doing something wrong here ? seems like setting output-radix to 16
breaks x/c output.
$ echo 'char f[]="abc";main(){}' | gcc -x c -g - -o a.out
$ gdb ./a.out
(gdb) b main
(gdb) r
(gdb) set output-radix 10
Output radix now set to decimal 10, hex a, octal 12.
(gdb) x/4c f
0x601018 <f>: 97 'a' 98 'b' 99 'c' 0 '\000'
(gdb) set output-radix 16
Output radix now set to decimal 16, hex 10, octal 20.
(gdb) x/4c f
0x601018 <f>: 0x61 0x62 0x63 0x0
i can understand the 0x61/97 change, but imo, the latter output shouldn't be
missing the 'a' bits.
-mike
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: output-radix breaks char output
2011-11-08 4:39 output-radix breaks char output Mike Frysinger
@ 2011-11-08 15:13 ` Pedro Alves
2011-11-08 17:04 ` Tom Tromey
1 sibling, 0 replies; 4+ messages in thread
From: Pedro Alves @ 2011-11-08 15:13 UTC (permalink / raw)
To: gdb; +Cc: Mike Frysinger
On Tuesday 08 November 2011 04:39:08, Mike Frysinger wrote:
> am i doing something wrong here ? seems like setting output-radix to 16
> breaks x/c output.
>
> $ echo 'char f[]="abc";main(){}' | gcc -x c -g - -o a.out
> $ gdb ./a.out
> (gdb) b main
> (gdb) r
> (gdb) set output-radix 10
> Output radix now set to decimal 10, hex a, octal 12.
> (gdb) x/4c f
> 0x601018 <f>: 97 'a' 98 'b' 99 'c' 0 '\000'
> (gdb) set output-radix 16
> Output radix now set to decimal 16, hex 10, octal 20.
> (gdb) x/4c f
> 0x601018 <f>: 0x61 0x62 0x63 0x0
>
> i can understand the 0x61/97 change, but imo, the latter output shouldn't be
> missing the 'a' bits.
I agree.
static void
set_output_radix_1 (int from_tty, unsigned radix)
{
/* Validate the radix and disallow ones that we aren't prepared to
handle correctly, leaving the radix unchanged. */
switch (radix)
{
case 16:
user_print_options.output_format = 'x'; /* hex */
break;
case 10:
user_print_options.output_format = 0; /* decimal */
break;
case 8:
user_print_options.output_format = 'o'; /* octal */
break;
default:
So radix==10 means "no format", and other radices work as if
the user overrode the format whenever printing, basically
the same as:
(top-gdb) p **argv
$3 = 47 '/'
GDB knew that was a char from the type.
(top-gdb) p /d **argv
$4 = 47
... when overridden as decimal number, the '/' is gone.
(top-gdb) x /d *argv
0x7fffffffe30a: 47
... same with `x' (the machinery that decides this is basically the same).
(top-gdb) p /x **argv
$5 = 0x2f
(top-gdb) p /o **argv
$6 = 057
(top-gdb) p /c **argv
$7 = 47 '/'
... and other formats too.
--
Pedro Alves
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: output-radix breaks char output
2011-11-08 4:39 output-radix breaks char output Mike Frysinger
2011-11-08 15:13 ` Pedro Alves
@ 2011-11-08 17:04 ` Tom Tromey
2011-11-08 18:11 ` Mike Frysinger
1 sibling, 1 reply; 4+ messages in thread
From: Tom Tromey @ 2011-11-08 17:04 UTC (permalink / raw)
To: Mike Frysinger; +Cc: gdb
>>>>> "Mike" == Mike Frysinger <vapier@gentoo.org> writes:
Mike> am i doing something wrong here ? seems like setting output-radix to 16
Mike> breaks x/c output.
I vaguely recall something in bugzilla about this.
Anyway it seems weird to me, too.
Tom
^ permalink raw reply [flat|nested] 4+ messages in thread
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2011-11-08 4:39 output-radix breaks char output Mike Frysinger
2011-11-08 15:13 ` Pedro Alves
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