RE: [cdt-dev] Pretty printing in gdb7

["Marc Khouzam" <marc.khouzam@xxxxxxxxxxxx>]

> -----Original Message-----
> From: cdt-dev-bounces@xxxxxxxxxxx 
> [mailto:cdt-dev-bounces@xxxxxxxxxxx] On Behalf Of Terry Parker
> Sent: June-05-09 2:05 PM
> To: CDT General developers list.
> Subject: [cdt-dev] Pretty printing in gdb7
> 
> I've been playing with the DSF-GDB framework (rc3) and a recent build
> of gdb7.  Together they make a compelling story for debugging C++
> binaries with Eclipse.
> 
> I'm seeing some problems with the Python pretty printing support.  The
> pretty printing works well for non-MI commands, but some of the MI
> commands are reporting the actual implementation structure while
> others report the underlying data.  A quick summary:
> 
> 1) std::string objects work great.  No more digging down 3-4 levels of
> basic_string structure to get the char* (which sometimes only shows
> the first character, so you need to copy the address to a memory view)
> 
> 2) std::set and std:map objects don't expose their elements.  The
> "var-list-children" MI command on these objects always returns a value
> of "0", making it appear that the set/map is empty.
> 
> 3) std::vectors cause an internal gdb assertion and exit.
> "var-list-children" returns the correct number of elements in the
> vector, but "var-info-path-expression var.[N]" commands, which should
> return the vector's parameterized type, instead return the vector's
> implementation structure. So "var-info-path-expression var.[0]"
> returns "std:_Vector_base..." and "var-info-path-expression var.[1]"
> asserts because vector only contains a single child member.
> 
> Is anyone having any success with gdb7's new pretty printing under the
> DSF-GDB framework?  Any insight on whether what I am seeing is
> requires a gdb fix or can be fixed in the Python scripts for pretty
> printing?  Or would it be easier to tackle this by modifying DSF-GDB
> itself?  Any pointers are welcome.

Hi Terry,

I personnally have not tried the new python support in GDB 7 and to 
be honnest, I'm not familiar with how it should be used at all.
No effort has been put in DSF-GDB to support it, but there seems
to be some interest from different people.

Sorry I can't be more helpful, but I wanted to at least let you know
that you are in uncharted territory.

I'll try to give it a spin as soon as I have some time, but I'm afraid
that won't be for a week or two.  If you make any progress, please share
your findings.  And feel free to write a bug to track this issue.

Best regards,

Marc


> 
> Thanks,
> Terry Parker
> Google, Inc.
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