Discussion list for gdb, the GNU source debugger

andy_westken | 25 Jul 2011 19:47

Setting a breakpoint at a line number and character offset


Hi

I apologise if this question has been answered elsewhere, but my web
searches were swamped by noise... 

Is is possible to get gdb to set a breakpoint at a line number and a
character offset (or column) on the line?

From what I understand, this is not possible (at least for Ubuntu and
GnuWin32 versions of the debugger). But I wanted to cross-check before using
this to justify an item in some coding conventions.

Thanks, Andy

P.S. My contention is that code of the following form is intrinsically evil,
from a debugging perspective.

if(condition) function1() else function2();

whereas

if(condition)
    function1()
else
    function2();

is debuggable!
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Charles Manning | 28 Jul 2011 00:10

Re: Setting a breakpoint at a line number and character offset

On Tuesday 26 July 2011 05:47:15 andy_westken wrote:
> Hi
>
> I apologise if this question has been answered elsewhere, but my web
> searches were swamped by noise...
>
> Is is possible to get gdb to set a breakpoint at a line number and a
> character offset (or column) on the line?

Only a line number AFAIK.

Setting it at an actual column offset would be challenging.

>
> From what I understand, this is not possible (at least for Ubuntu and
> GnuWin32 versions of the debugger). But I wanted to cross-check before
> using this to justify an item in some coding conventions.
>
> Thanks, Andy
>
> P.S. My contention is that code of the following form is intrinsically
> evil, from a debugging perspective.

Some might argue the corollary that debugging is evil from a coding 
perspective .
>
> if(condition) function1() else function2();

I guess you could do something like:

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andy_westken | 2 Aug 2011 00:25

Re: Setting a breakpoint at a line number and character offset


Charles Manning-2 wrote:
> 
> On Tuesday 26 July 2011 05:47:15 andy_westken wrote:
>> Hi
>>
>> I apologise if this question has been answered elsewhere, but my web
>> searches were swamped by noise...
>>
>> Is is possible to get gdb to set a breakpoint at a line number and a
>> character offset (or column) on the line?
> 
> Only a line number AFAIK.
> 
> Setting it at an actual column offset would be challenging.
> 

Thanks for the info.

Andy

P.S. Debugging is totally evil, but unfortunately necessary!

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