mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-19 10:53:58 +00:00
93 lines
2.9 KiB
C
93 lines
2.9 KiB
C
/* gc.c -- Functions to remember and garbage collect unused node contents.
|
|
$Id: gc.c,v 1.3 2004/04/11 17:56:45 karl Exp $
|
|
|
|
Copyright (C) 1993, 2004 Free Software Foundation, Inc.
|
|
|
|
This program 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.
|
|
|
|
This program 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 this program; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
|
|
Written by Brian Fox (bfox@ai.mit.edu). */
|
|
|
|
#include "info.h"
|
|
|
|
/* Array of pointers to the contents of gc-able nodes. A pointer on this
|
|
list can be garbage collected when no info window contains a node whose
|
|
contents member match the pointer. */
|
|
static char **gcable_pointers = (char **)NULL;
|
|
static int gcable_pointers_index = 0;
|
|
static int gcable_pointers_slots = 0;
|
|
|
|
/* Add POINTER to the list of garbage collectible pointers. A pointer
|
|
is not actually garbage collected until no info window contains a node
|
|
whose contents member is equal to the pointer. */
|
|
void
|
|
add_gcable_pointer (char *pointer)
|
|
{
|
|
gc_pointers ();
|
|
add_pointer_to_array (pointer, gcable_pointers_index, gcable_pointers,
|
|
gcable_pointers_slots, 10, char *);
|
|
}
|
|
|
|
/* Grovel the list of info windows and gc-able pointers finding those
|
|
node->contents which are collectible, and free them. */
|
|
void
|
|
gc_pointers (void)
|
|
{
|
|
register int i, j, k;
|
|
INFO_WINDOW *iw;
|
|
char **new = (char **)NULL;
|
|
int new_index = 0;
|
|
int new_slots = 0;
|
|
|
|
if (!info_windows || !gcable_pointers_index)
|
|
return;
|
|
|
|
for (i = 0; (iw = info_windows[i]); i++)
|
|
{
|
|
for (j = 0; j < iw->nodes_index; j++)
|
|
{
|
|
NODE *node = iw->nodes[j];
|
|
|
|
/* If this node->contents appears in our list of gcable_pointers,
|
|
it is not gc-able, so save it. */
|
|
for (k = 0; k < gcable_pointers_index; k++)
|
|
if (gcable_pointers[k] == node->contents)
|
|
{
|
|
add_pointer_to_array
|
|
(node->contents, new_index, new, new_slots, 10, char *);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* We have gathered all of the pointers which need to be saved. Free any
|
|
of the original pointers which do not appear in the new list. */
|
|
for (i = 0; i < gcable_pointers_index; i++)
|
|
{
|
|
for (j = 0; j < new_index; j++)
|
|
if (gcable_pointers[i] == new[j])
|
|
break;
|
|
|
|
/* If we got all the way through the new list, then the old pointer
|
|
can be garbage collected. */
|
|
if (new && !new[j])
|
|
free (gcable_pointers[i]);
|
|
}
|
|
|
|
free (gcable_pointers);
|
|
gcable_pointers = new;
|
|
gcable_pointers_slots = new_slots;
|
|
gcable_pointers_index = new_index;
|
|
}
|