mirror of
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535 lines
13 KiB
C
535 lines
13 KiB
C
/*
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+----------------------------------------------------------------------+
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| Zend Engine |
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+----------------------------------------------------------------------+
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| Copyright (c) 1998-2007 Zend Technologies Ltd. (http://www.zend.com) |
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+----------------------------------------------------------------------+
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| This source file is subject to version 2.00 of the Zend license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| http://www.zend.com/license/2_00.txt. |
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| If you did not receive a copy of the Zend license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@zend.com so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Authors: David Wang <planetbeing@gmail.com> |
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| Dmitry Stogov <dmitry@zend.com> |
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+----------------------------------------------------------------------+
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*/
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/* $Id$ */
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#include "zend.h"
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#include "zend_API.h"
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#define GC_ROOT_BUFFER_MAX_ENTRIES 10000
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#ifdef ZTS
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ZEND_API int gc_globals_id;
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#else
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ZEND_API zend_gc_globals gc_globals;
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#endif
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/* Forward declarations */
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static int children_scan_black(zval **pz TSRMLS_DC);
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static int children_mark_grey(zval **pz TSRMLS_DC);
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static int children_collect_white(zval **pz TSRMLS_DC);
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static int children_scan(zval **pz TSRMLS_DC);
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static void root_buffer_dtor(zend_gc_globals *gc_globals TSRMLS_DC)
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{
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if (gc_globals->buf) {
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free(gc_globals->buf);
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gc_globals->buf = NULL;
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}
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}
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static void gc_globals_ctor_ex(zend_gc_globals *gc_globals TSRMLS_DC)
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{
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gc_globals->gc_enabled = 0;
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gc_globals->gc_active = 0;
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gc_globals->buf = NULL;
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gc_globals->roots.next = NULL;
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gc_globals->roots.prev = NULL;
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gc_globals->unused = NULL;
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gc_globals->zval_to_free = NULL;
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gc_globals->gc_runs = 0;
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gc_globals->collected = 0;
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#if GC_BENCH
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gc_globals->root_buf_length = 0;
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gc_globals->root_buf_peak = 0;
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gc_globals->zval_possible_root = 0;
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gc_globals->zobj_possible_root = 0;
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gc_globals->zval_buffered = 0;
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gc_globals->zobj_buffered = 0;
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gc_globals->zval_remove_from_buffer = 0;
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gc_globals->zobj_remove_from_buffer = 0;
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gc_globals->zval_marked_grey = 0;
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gc_globals->zobj_marked_grey = 0;
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#endif
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}
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ZEND_API void gc_globals_ctor(TSRMLS_D)
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{
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#ifdef ZTS
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ts_allocate_id(&gc_globals_id, sizeof(zend_gc_globals), (ts_allocate_ctor) gc_globals_ctor_ex, (ts_allocate_dtor) root_buffer_dtor);
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#else
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gc_globals_ctor_ex(&gc_globals);
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#endif
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}
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ZEND_API void gc_globals_dtor(TSRMLS_D)
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{
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#ifndef ZTS
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root_buffer_dtor(&gc_globals TSRMLS_DC);
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#endif
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}
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ZEND_API void gc_reset(TSRMLS_D)
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{
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int i;
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GC_G(gc_runs) = 0;
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GC_G(collected) = 0;
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#if GC_BENCH
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GC_G(root_buf_length) = 0;
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GC_G(root_buf_peak) = 0;
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GC_G(zval_possible_root) = 0;
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GC_G(zobj_possible_root) = 0;
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GC_G(zval_buffered) = 0;
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GC_G(zobj_buffered) = 0;
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GC_G(zval_remove_from_buffer) = 0;
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GC_G(zobj_remove_from_buffer) = 0;
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GC_G(zval_marked_grey) = 0;
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GC_G(zobj_marked_grey) = 0;
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#endif
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if (GC_G(buf) &&
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(GC_G(roots).next != &GC_G(roots) ||
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GC_G(roots).prev != &GC_G(roots))) {
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GC_G(roots).next = &GC_G(roots);
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GC_G(roots).prev = &GC_G(roots);
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GC_G(unused) = &GC_G(buf)[0];
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for (i = 0; i < GC_ROOT_BUFFER_MAX_ENTRIES-1; i++) {
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GC_G(buf)[i].prev = &GC_G(buf)[i+1];
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}
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GC_G(buf)[GC_ROOT_BUFFER_MAX_ENTRIES-1].prev = NULL;
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GC_G(zval_to_free) = NULL;
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}
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}
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ZEND_API void gc_init(TSRMLS_D)
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{
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if (GC_G(buf) == NULL && GC_G(gc_enabled)) {
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GC_G(buf) = (gc_root_buffer*) malloc(sizeof(gc_root_buffer) * GC_ROOT_BUFFER_MAX_ENTRIES);
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gc_reset(TSRMLS_C);
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}
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}
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ZEND_API void gc_zval_possible_root(zval *zv TSRMLS_DC)
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{
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if (zv->type == IS_OBJECT) {
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GC_ZOBJ_CHECK_POSSIBLE_ROOT(zv);
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return;
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}
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GC_BENCH_INC(zval_possible_root);
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if (GC_ZVAL_GET_COLOR(zv) != GC_PURPLE) {
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GC_ZVAL_SET_PURPLE(zv);
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if (!GC_ZVAL_ADDRESS(zv)) {
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gc_root_buffer *newRoot = GC_G(unused);
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if (!newRoot) {
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if (!GC_G(gc_enabled)) {
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GC_ZVAL_SET_BLACK(zv);
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return;
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}
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zv->refcount__gc++;
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gc_collect_cycles(TSRMLS_C);
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zv->refcount__gc--;
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newRoot = GC_G(unused);
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if (!newRoot) {
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return;
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}
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GC_ZVAL_SET_PURPLE(zv);
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}
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GC_G(unused) = newRoot->prev;
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newRoot->next = GC_G(roots).next;
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newRoot->prev = &GC_G(roots);
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GC_G(roots).next->prev = newRoot;
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GC_G(roots).next = newRoot;
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GC_ZVAL_SET_ADDRESS(zv, newRoot);
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newRoot->handle = 0;
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newRoot->u.pz = zv;
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GC_BENCH_INC(zval_buffered);
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GC_BENCH_INC(root_buf_length);
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GC_BENCH_PEAK(root_buf_peak, root_buf_length);
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}
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}
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}
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ZEND_API void gc_zobj_possible_root(zval *zv TSRMLS_DC)
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{
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struct _store_object *obj;
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if (UNEXPECTED(Z_OBJ_HT_P(zv)->get_properties == NULL ||
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EG(objects_store).object_buckets == NULL)) {
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return;
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}
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GC_BENCH_INC(zobj_possible_root);
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obj = &EG(objects_store).object_buckets[Z_OBJ_HANDLE_P(zv)].bucket.obj;
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if (GC_GET_COLOR(obj->buffered) != GC_PURPLE) {
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GC_SET_PURPLE(obj->buffered);
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if (!GC_ADDRESS(obj->buffered)) {
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gc_root_buffer *newRoot = GC_G(unused);
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if (!newRoot) {
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if (!GC_G(gc_enabled)) {
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GC_ZVAL_SET_BLACK(zv);
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return;
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}
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zv->refcount__gc++;
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gc_collect_cycles(TSRMLS_C);
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zv->refcount__gc--;
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newRoot = GC_G(unused);
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if (!newRoot) {
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return;
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}
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obj = &EG(objects_store).object_buckets[Z_OBJ_HANDLE_P(zv)].bucket.obj;
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GC_SET_PURPLE(obj->buffered);
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}
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GC_G(unused) = newRoot->prev;
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newRoot->next = GC_G(roots).next;
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newRoot->prev = &GC_G(roots);
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GC_G(roots).next->prev = newRoot;
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GC_G(roots).next = newRoot;
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GC_SET_ADDRESS(obj->buffered, newRoot);
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newRoot->handle = Z_OBJ_HANDLE_P(zv);
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newRoot->u.handlers = Z_OBJ_HT_P(zv);
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GC_BENCH_INC(zobj_buffered);
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GC_BENCH_INC(root_buf_length);
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GC_BENCH_PEAK(root_buf_peak, root_buf_length);
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}
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}
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}
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static void zobj_scan_black(struct _store_object *obj, zval *pz TSRMLS_DC)
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{
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GC_SET_BLACK(obj->buffered);
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if (EXPECTED(Z_OBJ_HANDLER_P(pz, get_properties) != NULL)) {
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zend_hash_apply(Z_OBJPROP_P(pz), (apply_func_t) children_scan_black TSRMLS_CC);
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}
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}
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static void zval_scan_black(zval *pz TSRMLS_DC)
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{
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GC_ZVAL_SET_BLACK(pz);
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if (Z_TYPE_P(pz) == IS_OBJECT && EG(objects_store).object_buckets) {
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struct _store_object *obj = &EG(objects_store).object_buckets[Z_OBJ_HANDLE_P(pz)].bucket.obj;
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obj->refcount++;
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if (GC_GET_COLOR(obj->buffered) != GC_BLACK) {
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zobj_scan_black(obj, pz TSRMLS_CC);
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}
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} else if (Z_TYPE_P(pz) == IS_ARRAY) {
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if (Z_ARRVAL_P(pz) != &EG(symbol_table)) {
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zend_hash_apply(Z_ARRVAL_P(pz), (apply_func_t) children_scan_black TSRMLS_CC);
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}
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}
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}
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static int children_scan_black(zval **pz TSRMLS_DC)
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{
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(*pz)->refcount__gc++;
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if (GC_ZVAL_GET_COLOR(*pz) != GC_BLACK) {
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zval_scan_black(*pz TSRMLS_CC);
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}
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return 0;
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}
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static void zobj_mark_grey(struct _store_object *obj, zval *pz TSRMLS_DC)
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{
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if (GC_GET_COLOR(obj->buffered) != GC_GREY) {
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GC_BENCH_INC(zobj_marked_grey);
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GC_SET_COLOR(obj->buffered, GC_GREY);
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if (EXPECTED(Z_OBJ_HANDLER_P(pz, get_properties) != NULL)) {
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zend_hash_apply(Z_OBJPROP_P(pz), (apply_func_t) children_mark_grey TSRMLS_CC);
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}
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}
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}
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static void zval_mark_grey(zval *pz TSRMLS_DC)
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{
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if (GC_ZVAL_GET_COLOR(pz) != GC_GREY) {
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GC_BENCH_INC(zval_marked_grey);
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GC_ZVAL_SET_COLOR(pz, GC_GREY);
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if (Z_TYPE_P(pz) == IS_OBJECT && EG(objects_store).object_buckets) {
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struct _store_object *obj = &EG(objects_store).object_buckets[Z_OBJ_HANDLE_P(pz)].bucket.obj;
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obj->refcount--;
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zobj_mark_grey(obj, pz TSRMLS_CC);
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} else if (Z_TYPE_P(pz) == IS_ARRAY) {
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if (Z_ARRVAL_P(pz) == &EG(symbol_table)) {
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GC_ZVAL_SET_BLACK(pz);
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} else {
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zend_hash_apply(Z_ARRVAL_P(pz), (apply_func_t) children_mark_grey TSRMLS_CC);
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}
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}
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}
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}
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static int children_mark_grey(zval **pz TSRMLS_DC)
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{
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(*pz)->refcount__gc--;
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zval_mark_grey(*pz TSRMLS_CC);
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return 0;
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}
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static void gc_mark_roots(TSRMLS_D)
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{
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gc_root_buffer *current = GC_G(roots).next;
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while (current != &GC_G(roots)) {
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if (current->handle && EG(objects_store).object_buckets) {
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struct _store_object *obj = &EG(objects_store).object_buckets[current->handle].bucket.obj;
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if (GC_GET_COLOR(obj->buffered) == GC_PURPLE) {
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zval z;
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INIT_PZVAL(&z);
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Z_OBJ_HANDLE(z) = current->handle;
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Z_OBJ_HT(z) = current->u.handlers;
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zobj_mark_grey(obj, &z TSRMLS_CC);
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} else {
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GC_SET_ADDRESS(obj->buffered, NULL);
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GC_REMOVE_FROM_BUFFER(current);
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}
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} else {
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if (GC_ZVAL_GET_COLOR(current->u.pz) == GC_PURPLE) {
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zval_mark_grey(current->u.pz TSRMLS_CC);
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} else {
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GC_ZVAL_SET_ADDRESS(current->u.pz, NULL);
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GC_REMOVE_FROM_BUFFER(current);
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}
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}
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current = current->next;
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}
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}
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static void zobj_scan(zval *pz TSRMLS_DC)
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{
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if (EG(objects_store).object_buckets) {
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struct _store_object *obj = &EG(objects_store).object_buckets[Z_OBJ_HANDLE_P(pz)].bucket.obj;
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if (GC_GET_COLOR(obj->buffered) == GC_GREY) {
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if (obj->refcount > 0) {
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zobj_scan_black(obj, pz TSRMLS_CC);
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} else {
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GC_SET_COLOR(obj->buffered, GC_WHITE);
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if (EXPECTED(Z_OBJ_HANDLER_P(pz, get_properties) != NULL)) {
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zend_hash_apply(Z_OBJPROP_P(pz), (apply_func_t) children_scan TSRMLS_CC);
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}
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}
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}
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}
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}
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static int zval_scan(zval *pz TSRMLS_DC)
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{
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if (GC_ZVAL_GET_COLOR(pz) == GC_GREY) {
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if (pz->refcount__gc > 0) {
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zval_scan_black(pz TSRMLS_CC);
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} else {
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GC_ZVAL_SET_COLOR(pz, GC_WHITE);
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if (Z_TYPE_P(pz) == IS_OBJECT) {
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zobj_scan(pz TSRMLS_CC);
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} else if (Z_TYPE_P(pz) == IS_ARRAY) {
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if (Z_ARRVAL_P(pz) == &EG(symbol_table)) {
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GC_ZVAL_SET_BLACK(pz);
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} else {
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zend_hash_apply(Z_ARRVAL_P(pz), (apply_func_t) children_scan TSRMLS_CC);
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}
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}
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}
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}
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return 0;
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}
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static int children_scan(zval **pz TSRMLS_DC)
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{
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zval_scan(*pz TSRMLS_CC);
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return 0;
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}
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static void gc_scan_roots(TSRMLS_D)
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{
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gc_root_buffer *current = GC_G(roots).next;
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while (current != &GC_G(roots)) {
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if (current->handle) {
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zval z;
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INIT_PZVAL(&z);
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Z_OBJ_HANDLE(z) = current->handle;
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Z_OBJ_HT(z) = current->u.handlers;
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zobj_scan(&z TSRMLS_CC);
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} else {
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zval_scan(current->u.pz TSRMLS_CC);
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}
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current = current->next;
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}
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}
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static void zobj_collect_white(zval *pz TSRMLS_DC)
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{
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if (EG(objects_store).object_buckets) {
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zend_object_handle handle = Z_OBJ_HANDLE_P(pz);
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struct _store_object *obj = &EG(objects_store).object_buckets[handle].bucket.obj;
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if (obj->buffered == (gc_root_buffer*)GC_WHITE) {
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GC_SET_BLACK(obj->buffered);
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if (EXPECTED(Z_OBJ_HANDLER_P(pz, get_properties) != NULL)) {
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zend_hash_apply(Z_OBJPROP_P(pz), (apply_func_t) children_collect_white TSRMLS_CC);
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}
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}
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}
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}
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static void zval_collect_white(zval *pz TSRMLS_DC)
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{
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if (((zval_gc_info*)(pz))->u.buffered == (gc_root_buffer*)GC_WHITE) {
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GC_ZVAL_SET_BLACK(pz);
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if (Z_TYPE_P(pz) == IS_OBJECT) {
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zobj_collect_white(pz TSRMLS_CC);
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} else {
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if (Z_TYPE_P(pz) == IS_ARRAY) {
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if (Z_ARRVAL_P(pz) == &EG(symbol_table)) {
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return;
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}
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zend_hash_apply(Z_ARRVAL_P(pz), (apply_func_t) children_collect_white TSRMLS_CC);
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}
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/* restore refcount */
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pz->refcount__gc++;
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}
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((zval_gc_info*)pz)->u.next = GC_G(zval_to_free);
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GC_G(zval_to_free) = (zval_gc_info*)pz;
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}
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}
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static int children_collect_white(zval **pz TSRMLS_DC)
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{
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zval_collect_white(*pz TSRMLS_CC);
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return 0;
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}
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static void gc_collect_roots(TSRMLS_D)
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{
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gc_root_buffer *current = GC_G(roots).next;
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while (current != &GC_G(roots)) {
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if (current->handle && EG(objects_store).object_buckets) {
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struct _store_object *obj = &EG(objects_store).object_buckets[current->handle].bucket.obj;
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zval z;
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GC_SET_ADDRESS(obj->buffered, NULL);
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INIT_PZVAL(&z);
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Z_OBJ_HANDLE(z) = current->handle;
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Z_OBJ_HT(z) = current->u.handlers;
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zobj_collect_white(&z TSRMLS_CC);
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} else {
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GC_ZVAL_SET_ADDRESS(current->u.pz, NULL);
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zval_collect_white(current->u.pz TSRMLS_CC);
|
|
}
|
|
|
|
GC_REMOVE_FROM_BUFFER(current);
|
|
current = current->next;
|
|
}
|
|
}
|
|
|
|
ZEND_API int gc_collect_cycles(TSRMLS_D)
|
|
{
|
|
int count = 0;
|
|
|
|
if (GC_G(roots).next != &GC_G(roots)) {
|
|
zval_gc_info *p, *q;
|
|
|
|
if (GC_G(gc_active)) {
|
|
return 0;
|
|
}
|
|
GC_G(gc_runs)++;
|
|
GC_G(zval_to_free) = NULL;
|
|
gc_mark_roots(TSRMLS_C);
|
|
GC_G(gc_active) = 1;
|
|
gc_scan_roots(TSRMLS_C);
|
|
gc_collect_roots(TSRMLS_C);
|
|
GC_G(gc_active) = 0;
|
|
|
|
p = GC_G(zval_to_free);
|
|
GC_G(zval_to_free) = NULL;
|
|
while (p) {
|
|
q = p->u.next;
|
|
if (Z_TYPE(p->z) == IS_OBJECT) {
|
|
if (EG(objects_store).object_buckets &&
|
|
EG(objects_store).object_buckets[Z_OBJ_HANDLE(p->z)].valid &&
|
|
EG(objects_store).object_buckets[Z_OBJ_HANDLE(p->z)].bucket.obj.refcount <= 1) {
|
|
if (EXPECTED(Z_OBJ_HANDLER(p->z, get_properties) != NULL)) {
|
|
Z_OBJPROP(p->z)->pDestructor = NULL;
|
|
}
|
|
EG(objects_store).object_buckets[Z_OBJ_HANDLE(p->z)].bucket.obj.refcount = 1;
|
|
zend_objects_store_del_ref_by_handle(Z_OBJ_HANDLE(p->z) TSRMLS_CC);
|
|
}
|
|
} else {
|
|
if (Z_TYPE(p->z) == IS_ARRAY) {
|
|
Z_ARRVAL(p->z)->pDestructor = NULL;
|
|
}
|
|
zval_dtor(&p->z);
|
|
}
|
|
FREE_ZVAL_EX(&p->z);
|
|
p = q;
|
|
count++;
|
|
}
|
|
GC_G(collected) += count;
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
/*
|
|
* Local variables:
|
|
* tab-width: 4
|
|
* c-basic-offset: 4
|
|
* indent-tabs-mode: t
|
|
* End:
|
|
*/
|