* flow.c (clear_log_links): Use free_INSN_LIST_list, not

[pf3gnuchains/gcc-fork.git] / gcc / ggc-page.c

diff --git a/gcc/ggc-page.c b/gcc/ggc-page.c
index 09a4ff9..7f4ac87 100644 (file)
--- a/gcc/ggc-page.c
+++ b/gcc/ggc-page.c
@@ -1,22 +1,22 @@
 /* "Bag-of-pages" garbage collector for the GNU compiler.
    Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
 
-This file is part of GNU CC.
+This file is part of GCC.
 
-GNU CC is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 2, or (at your option) any later
+version.
 
-GNU CC is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
 
 You should have received a copy of the GNU General Public License
-along with GNU CC; see the file COPYING.  If not, write to
-the Free Software Foundation, 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA.  */
+along with GCC; see the file COPYING.  If not, write to the Free
+Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+02111-1307, USA.  */
 
 #include "config.h"
 #include "system.h"
@@ -110,7 +110,7 @@ Boston, MA 02111-1307, USA.  */
      1: GC statistics only.
      2: Page-entry allocations/deallocations as well.
      3: Object allocations as well.
-     4: Object marks as well.   */
+     4: Object marks as well.  */
 #define GGC_DEBUG_LEVEL (0)
 \f
 #ifndef HOST_BITS_PER_PTR
@@ -1001,6 +1001,35 @@ ggc_set_mark (p)
   return 0;
 }
 
+/* Return 1 if P has been marked, zero otherwise. 
+   P must have been allocated by the GC allocator; it mustn't point to
+   static objects, stack variables, or memory allocated with malloc.  */
+
+int
+ggc_marked_p (p)
+     const void *p;
+{
+  page_entry *entry;
+  unsigned bit, word;
+  unsigned long mask;
+
+  /* Look up the page on which the object is alloced.  If the object
+     wasn't allocated by the collector, we'll probably die.  */
+  entry = lookup_page_table_entry (p);
+#ifdef ENABLE_CHECKING
+  if (entry == NULL)
+    abort ();
+#endif
+
+  /* Calculate the index of the object on the page; this is its bit
+     position in the in_use_p bitmap.  */
+  bit = (((const char *) p) - entry->page) / OBJECT_SIZE (entry->order);
+  word = bit / HOST_BITS_PER_LONG;
+  mask = (unsigned long) 1 << (bit % HOST_BITS_PER_LONG);
+  
+  return (entry->in_use_p[word] & mask) != 0;
+}
+
 /* Return the size of the gc-able object P.  */
 
 size_t