* execution does not run in the source line's order
@ 2012-08-11 3:14 rivers horse
2012-08-11 6:24 ` Jan Kratochvil
2012-08-11 6:31 ` Eli Zaretskii
0 siblings, 2 replies; 3+ messages in thread
From: rivers horse @ 2012-08-11 3:14 UTC (permalink / raw)
To: gdb
hi,
I debug gdb using itself, i find a strange issue ：
the programme being debugged execute not in line
order,for example, it goes into line 20,then it goes into line 18 ,
which are simply assignment operations,
what is the reasin for this?
thanks!
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: execution does not run in the source line's order
2012-08-11 3:14 execution does not run in the source line's order rivers horse
@ 2012-08-11 6:24 ` Jan Kratochvil
2012-08-11 6:31 ` Eli Zaretskii
1 sibling, 0 replies; 3+ messages in thread
From: Jan Kratochvil @ 2012-08-11 6:24 UTC (permalink / raw)
To: rivers horse; +Cc: gdb
On Sat, 11 Aug 2012 05:14:41 +0200, rivers horse wrote:
> I debug gdb using itself, i find a strange issue ：
> the programme being debugged execute not in line
> order,for example, it goes into line 20,then it goes into line 18 ,
> which are simply assignment operations,
>
> what is the reasin for this?
You have probably compiled the file with -O2, use/force -O0 (gcc options).
Regards,
Jan
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: execution does not run in the source line's order
2012-08-11 3:14 execution does not run in the source line's order rivers horse
2012-08-11 6:24 ` Jan Kratochvil
@ 2012-08-11 6:31 ` Eli Zaretskii
1 sibling, 0 replies; 3+ messages in thread
From: Eli Zaretskii @ 2012-08-11 6:31 UTC (permalink / raw)
To: rivers horse; +Cc: gdb
> Date: Sat, 11 Aug 2012 11:14:41 +0800
> From: rivers horse <horserivers@gmail.com>
>
> I debug gdb using itself, i find a strange issue 拢潞
> the programme being debugged execute not in line
> order,for example, it goes into line 20,then it goes into line 18 ,
> which are simply assignment operations,
>
> what is the reasin for this?
Compiler optimizations are known to reorder code, if doing so cannot
affect the result. If your GDB is compiled with optimizations, that's
the reason.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2012-08-11 3:14 execution does not run in the source line's order rivers horse
2012-08-11 6:24 ` Jan Kratochvil
2012-08-11 6:31 ` Eli Zaretskii
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