Avoid leak caused by BLOCK pointing to LABEL_DECL pointing to CODE_LABEL pointing everywhere

[Graham Stott]

Jan,

This patch breaks bootstrap :-(

gcc3.5/gcc/gcc/passes.c: In function `rest_of_clean_state':
gcc3.5/gcc/gcc/passes.c:1637: warning: ISO C90 forbids mixed declarations and code

I can't see how this could have passed bootstrap.


Graham


Jan Hubicka wrote:
> Hi,

> 
> Bootstrapped/regtested i686-pc-gnu-linux without gcac
I can't see how did this patch could pass bootstrap!
> 
> OK?
> Honza
> 
> 	* passes.c (rest_of_clean_state):  Decompose the instruction stream.
> 
> Index: passes.c
> ===================================================================
> RCS file: /cvs/gcc/gcc/gcc/passes.c,v
> retrieving revision 2.2.4.9
> diff -c -3 -p -r2.2.4.9 passes.c
> *** passes.c	2 Aug 2004 23:11:52 -0000	2.2.4.9
> --- passes.c	3 Sep 2004 20:09:32 -0000
> *************** static void
> *** 1637,1642 ****
> --- 1637,1654 ----
>   rest_of_clean_state (void)
>   {
>     coverage_end_function ();
> +   rtx insn, next;
       ^^^^^^^^^^^^^^ mixing declarions and code breaks bootstrap.
> + 
> +   /* It is very important to decompose the RTL instruction chain here:
> +      debug information keeps pointing into CODE_LABEL insns inside the function
> +      body.  If these remain pointing to the other insns, we end up preserving
> +      whole RTL chain and attached detailed debug info in memory.  */
> +   for (insn = get_insns (); insn; insn = next)
> +     {
> +       next = NEXT_INSN (insn);
> +       NEXT_INSN (insn) = NULL;
> +       PREV_INSN (insn) = NULL;
> +     }
>   
>     /* In case the function was not output,
>        don't leave any temporary anonymous types
>