Dwarf2-related Internal error

[Michal Ludvig]

Hi Daniel, Elena and others,
this problem is still present in recent HEAD - could anyone who knows 
the internals of symbols handling and .debug_info please help me with 
fixing it, please? I tried to debug it myself but got quickly lost in 
all those symbols<->types<->other_types references and couldn't find 
where the problem originates.

Also pointing out the right direction where to look for the bug would 
help me a lot :-)

BTW I also filled a PR with a very nice number 1333 for this issue.

Thanks in advance!

Michal Ludvig

Michal Ludvig told me that:
> Hi all,
> I have problems debugging the attached code (real.f) on AMD64 platform. 
> However the problem doesn't seem to be AMD64-related, but Dwarf2-related 
> instead and it only happens if it is compiled by the PGI fortran 
> compiler (beta is available for free download at www.pgroup.com/AMD64).
> 
> Debugging the 'real' binary on AMD64/Linux systems leads to GDB internal 
> error:
> 
> $ ../gdb real
> GNU gdb 2003-07-08-cvs
> Copyright 2003 Free Software Foundation, Inc.
> [...]
> This GDB was configured as "x86_64-unknown-linux-gnu"...
> (gdb) b hurdgy
> Breakpoint 1 at 0x4000113c: file real.f, line 8.
> (gdb) r
> Starting program: /tmp/gdbbuild/gdb/fortran/real
> 
> Breakpoint 1, hurdgy (xx=
> /ttt/64/gdb-head/gdb/utils.c:1058: internal-error: virtual memory 
> exhausted: can't allocate 4294967404 bytes.
> A problem internal to GDB has been detected,
> further debugging may prove unreliable.
> Quit this debugging session? (y or n) y
> 
> /ttt/64/gdb-head/gdb/utils.c:1058: internal-error: virtual memory 
> exhausted: can't allocate 4294967404 bytes.
> A problem internal to GDB has been detected,
> further debugging may prove unreliable.
> Create a core file of GDB? (y or n) n
> $
> 
> Something is wrong in parsing the Dwarf2 .debug_info section - 
> unfortunately I don't understand the GDB internals in this field.
> Could someone help me with it, please?
> 
> All relevant files (source, asm, binaries, cores) are available at:
> http://tmp.logix.cz/amd/fortran/
> 
> Thanks in advance for any help!
> 
> Michal Ludvig
> 
> 
> ------------------------------------------------------------------------
> 
>       real flat(10)
>       call hurdgy(flat, 10)
> 
>       end
> 
>       subroutine hurdgy(xx,i)
>       integer i
>       real xx(i)
>       end