117 lines
2.5 KiB
C
117 lines
2.5 KiB
C
/*
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garbage.c
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Object system garbage collector.
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Copyright (C) 2003 Brian Koropoff
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Author: Brian Koropoff
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Date: November 28, 2003
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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static __attribute__ ((used)) const char rcsid[] =
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"$Id$";
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#include <stdlib.h>
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#include "QF/sys.h"
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#include "QF/object.h"
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#include "garbage.h"
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Object *junk = NULL;
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unsigned int junked = 0;
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void
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Garbage_Do_Mark (Object *root)
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{
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if (!root->marked) {
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ObjRefs_t *allrefs;
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root->marked = true;
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Sys_DPrintf ("GC: Marked %s@%p.\n", root->cl->name, root);
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if (root->allRefs)
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for (allrefs = methodCall(root, allRefs); allrefs; allrefs = allrefs->next) {
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unsigned int i;
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for (i = 0; i < allrefs->count; i++)
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Garbage_Do_Mark (allrefs->objs[i]);
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}
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}
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}
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Object *
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Garbage_Do_Sweep (Object **allobjs)
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{
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Object **prevNext;
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Object *obj;
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for (prevNext = allobjs, obj = *allobjs;; obj = *prevNext) {
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if (obj->marked) {
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obj->marked = false;
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prevNext = &obj->next;
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} else if (!obj->refs) {
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if (!obj->finalized && methodCall(obj, finalize)) {
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obj->finalized = true;
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Garbage_Do_Mark (obj);
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prevNext = &obj->next;
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} else {
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*prevNext = obj->next;
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obj->next = junk;
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junk = obj;
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junked++;
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Sys_DPrintf ("GC: %s@%p is ready for disposal...\n", obj->cl->name, obj);
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}
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} else
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*prevNext = obj->next;
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if (!*prevNext)
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return obj;
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}
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}
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unsigned int
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Garbage_Pending (void)
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{
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return junked;
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}
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void
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Garbage_Dispose (Object **allobjs, unsigned int amount)
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{
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Object *next;
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for (; junk && amount; junk = next, amount--) {
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next = junk->next;
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if (junk->marked) {
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junk->marked = false;
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junk->next = *allobjs;
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*allobjs = junk;
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} else {
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Sys_DPrintf ("GC: Disposing of %s@%p...\n", junk->cl->name, junk);
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Object_Delete (junk);
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junked--;
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}
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}
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}
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