[patch] Better checking for cache line state

["Dave Brolley" <brolley@redhat.com>]

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Hi,

On the target I'm working on, the programmer can directly write into the
cache tags. This requires more vigilance regarding the state of the cache
tags. Specifically, we should check the result of valid_p () before using
the tag.

I've committed the attached patch.

Dave

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Index: sid/component/cache/cacheutil.cxx
===================================================================
RCS file: /cvs/src/src/sid/component/cache/cacheutil.cxx,v
retrieving revision 1.8
retrieving revision 1.9
diff -c -p -r1.8 -r1.9
*** sid/component/cache/cacheutil.cxx	29 Apr 2004 20:26:08 -0000	1.8
--- sid/component/cache/cacheutil.cxx	10 May 2004 21:51:10 -0000	1.9
*************** cache_set::find_any_dirty ()
*** 189,195 ****
    for (iterator_t it = lines.begin (); it != lines.end (); it++)
      {
        cache_line* i = * it;
!       if (i->dirty_p ()) return i;
      }
  
    return 0;
--- 189,195 ----
    for (iterator_t it = lines.begin (); it != lines.end (); it++)
      {
        cache_line* i = * it;
!       if (i->valid_p () && i->dirty_p ()) return i;
      }
  
    return 0;
*************** bool
*** 206,212 ****
  cache_set::vacancy_p () const
  {
    for (const_iterator_t it = lines.begin (); it != lines.end (); it++)
!     if (!(*it)->locked_p ())
        return true;
  
    return false;
--- 206,212 ----
  cache_set::vacancy_p () const
  {
    for (const_iterator_t it = lines.begin (); it != lines.end (); it++)
!     if (!(*it)->valid_p () || !(*it)->locked_p ())
        return true;
  
    return false;