[Bug middle-end/25636] cc1 and cc1plus --help core

["drab at kepler dot fjfi dot cvut dot cz" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #15 from drab at kepler dot fjfi dot cvut dot cz  2006-01-16 03:02 -------
(In reply to comment #13)
> This is how the (relevant) thing looks like, when compiled with -O2
> -fomit-frame-pointer. I removed the "static" modifier of the function, since
> then it got merged within other functions and didn't get its own instance, but
> the failure is still there.
> 
> ------------------------------
>         .p2align 4,,15
>         .type   print_filtered_help, @function
> print_filtered_help:
> .LFB197:
>         .loc 1 1290 0
> .LVL93:
>         pushl   %ebp
> .LCFI22:
>         pushl   %edi
> .LCFI23:
>         pushl   %esi
> .LCFI24:
>         pushl   %ebx
> .LCFI25:
>         subl    $28, %esp
> .LCFI26:
>         .loc 1 1296 0
>         cmpl    $536870912, %eax
>         sete    %dl
>         cmpl    $4194304, %eax
>         .loc 1 1290 0
>         movl    %eax, 16(%esp)
>         .loc 1 1296 0
>         sete    %al
> .LVL94:
>         orb     %al, %dl
>         je      .L155
>         .loc 1 1299 0
>         movl    printed.20731, %eax
>         testl   %eax, %eax
>         je      .L211
>         movl    cl_options_count, %ebx
> .L157:
>         .loc 1 1301 0
>         movl    printed.20731, %eax
>         movl    %ebx, cl_options_count
> .LBB59:
> .LBB60:
>         .file 3 "/usr/include/bits/stdio.h"
>         .loc 3 94 0
>         xorl    %esi, %esi
> .LVL95:
> .LBE60:
> .LBE59:
>         .loc 1 1301 0
>         movl    %ebx, 8(%esp)
>         movl    $0, 4(%esp)
> .LBB61:
> .LBB62:
>         .loc 3 94 0
>         xorl    %ebx, %ebx
> .LBE62:
> .LBE61:
>         .loc 1 1301 0
>         movl    %eax, (%esp)
>         call    memset

I guess the third parameter isn't set at all! Is it supposed to be %ecx or what
is supposed to be the third register parameter of the memset call? Anyway, it
should be set to the 'cl_options_count', but you may notice, that
'cl_options_count' resides in %ebx all the time, and just before the call to
the 'memset' function there is a 'xorl %ebx, %ebx', which is perhaps correct as
it is the second argument of the 'memset' and that should be 0. But the third
argument is left totally unset, though random, and though causes the segfault!
(I think)

> ...
> 
> .L211:
>         .loc 1 1300 0
>         movl    cl_options_count, %ebx
>         movl    %ebx, (%esp)
>         call    xmalloc
>         movl    %eax, printed.20731
>         jmp     .L157
> 
> ...
> ------------------------------
> 


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25636