recursive bug in dwarf2read.c

Gaius Mulley gaius@glam.ac.uk
Thu Dec 10 00:15:00 GMT 2009


Daniel Jacobowitz <drow@false.org> writes:

> On Wed, Dec 09, 2009 at 10:55:30AM +0000, Gaius Mulley wrote:
>> 
>> Hi,
>> 
>> I think there is a bug in dwarf2read.c which can be exposed by
>> attempting to set a break point at RealIO_WriteFixed in this
>> executable.
>> 
>> I acknowledge the (gnu modula-2 generated executable) could probably
>> be at fault, nevertheless it does contain cyclic data structures which
>> are not explicitly created in the same way as C.  For example:
>> 
>> 
>> TYPE
>>   ScanState =  PROCEDURE (CHAR, VAR ScanClass, VAR ScanState);
>
> See e.g. this from read_structure_type:
>
>   /* We need to add the type field to the die immediately so we don't
>      infinitely recurse when dealing with pointers to the structure
>      type within the structure itself. */
>   set_die_type (die, type, cu);
>
> It looks as if read_subroutine_type does not do that, but now has to.

Hi Daniel,

thanks for the pointer - I'll work on a patch for this..

regards,
Gaius



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