138 lines
3.4 KiB
C
138 lines
3.4 KiB
C
/***********************************************************************/
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/* */
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/* Objective Caml */
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/* */
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/* Xavier Leroy and Damien Doligez, INRIA Rocquencourt */
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/* */
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/* Copyright 1996 Institut National de Recherche en Informatique et */
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/* en Automatique. All rights reserved. This file is distributed */
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/* under the terms of the GNU Library General Public License. */
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/* */
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/***********************************************************************/
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/* $Id$ */
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/* To walk the memory roots for garbage collection */
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#include "major_gc.h"
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#include "memory.h"
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#include "minor_gc.h"
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#include "misc.h"
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#include "mlvalues.h"
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#include "roots.h"
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#include "stacks.h"
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struct caml__roots_block *local_roots = NULL;
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struct global_root {
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value * root;
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struct global_root * next;
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};
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static struct global_root * global_roots = NULL;
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void (*scan_roots_hook) (scanning_action f) = NULL;
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/* Register a global C root */
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void register_global_root(value *r)
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{
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struct global_root * gr;
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Assert (((long) r & 3) == 0); /* compact.c demands this (for now) */
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gr = (struct global_root *) stat_alloc(sizeof(struct global_root));
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gr->root = r;
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gr->next = global_roots;
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global_roots = gr;
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}
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/* Un-register a global C root */
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void remove_global_root(value *r)
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{
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struct global_root ** gp, * gr;
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for (gp = &global_roots; *gp != NULL; gp = &(*gp)->next) {
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gr = *gp;
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if (gr->root == r) {
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*gp = gr->next;
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stat_free(gr);
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return;
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}
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}
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}
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/* Call [oldify] on all roots except [global_data] */
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void oldify_local_roots (void)
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{
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register value * sp;
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struct global_root * gr;
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struct caml__roots_block *lr;
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long i, j;
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/* The stack */
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for (sp = extern_sp; sp < stack_high; sp++) {
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oldify (*sp, sp);
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}
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/* Local C roots */
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for (lr = local_roots; lr != NULL; lr = lr->next) {
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for (i = 0; i < lr->ntables; i++){
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for (j = 0; j < lr->nitems; j++){
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sp = &(lr->tables[i][j]);
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oldify (*sp, sp);
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}
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}
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}
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/* Global C roots */
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for (gr = global_roots; gr != NULL; gr = gr->next) {
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oldify(*(gr->root), gr->root);
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}
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/* Hook */
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if (scan_roots_hook != NULL) (*scan_roots_hook)(oldify);
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}
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/* Call [darken] on all roots */
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void darken_all_roots (void)
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{
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do_roots (darken);
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}
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void do_roots (scanning_action f)
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{
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struct global_root * gr;
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/* Global variables */
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f(global_data, &global_data);
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/* The stack and the local C roots */
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do_local_roots(f, extern_sp, stack_high, local_roots);
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/* Global C roots */
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for (gr = global_roots; gr != NULL; gr = gr->next) {
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f (*(gr->root), gr->root);
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}
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/* Hook */
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if (scan_roots_hook != NULL) (*scan_roots_hook)(f);
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}
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void do_local_roots (scanning_action f, value *stack_low, value *stack_high, struct caml__roots_block *local_roots)
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{
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register value * sp;
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struct caml__roots_block *lr;
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int i, j;
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for (sp = stack_low; sp < stack_high; sp++) {
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f (*sp, sp);
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}
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for (lr = local_roots; lr != NULL; lr = lr->next) {
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for (i = 0; i < lr->ntables; i++){
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for (j = 0; j < lr->nitems; j++){
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sp = &(lr->tables[i][j]);
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f (*sp, sp);
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}
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}
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}
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}
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