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/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) Zend Technologies Ltd. (http://www.zend.com) |
+----------------------------------------------------------------------+
| This source file is subject to version 2.00 of the Zend license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.zend.com/license/2_00.txt. |
| If you did not receive a copy of the Zend license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@zend.com so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: David Wang <planetbeing@gmail.com> |
| Dmitry Stogov <dmitry@php.net> |
+----------------------------------------------------------------------+
*/
#ifndef ZEND_GC_H
#define ZEND_GC_H
BEGIN_EXTERN_C()
typedef struct _zend_gc_status {
uint32_t runs;
uint32_t collected;
uint32_t threshold;
uint32_t num_roots;
} zend_gc_status;
ZEND_API extern int (*gc_collect_cycles)(void);
ZEND_API void ZEND_FASTCALL gc_possible_root(zend_refcounted *ref);
ZEND_API void ZEND_FASTCALL gc_remove_from_buffer(zend_refcounted *ref);
/* enable/disable automatic start of GC collection */
ZEND_API bool gc_enable(bool enable);
ZEND_API bool gc_enabled(void);
/* enable/disable possible root additions */
ZEND_API bool gc_protect(bool protect);
ZEND_API bool gc_protected(void);
/* The default implementation of the gc_collect_cycles callback. */
ZEND_API int zend_gc_collect_cycles(void);
ZEND_API void zend_gc_get_status(zend_gc_status *status);
void gc_globals_ctor(void);
void gc_globals_dtor(void);
void gc_reset(void);
#ifdef ZTS
size_t zend_gc_globals_size(void);
#endif
#define GC_REMOVE_FROM_BUFFER(p) do { \
zend_refcounted *_p = (zend_refcounted*)(p); \
if (GC_TYPE_INFO(_p) & GC_INFO_MASK) { \
gc_remove_from_buffer(_p); \
} \
} while (0)
#define GC_MAY_LEAK(ref) \
((GC_TYPE_INFO(ref) & \
(GC_INFO_MASK | (GC_NOT_COLLECTABLE << GC_FLAGS_SHIFT))) == 0)
static zend_always_inline void gc_check_possible_root(zend_refcounted *ref)
{
if (EXPECTED(GC_TYPE_INFO(ref) == GC_REFERENCE)) {
zval *zv = &((zend_reference*)ref)->val;
if (!Z_COLLECTABLE_P(zv)) {
return;
}
ref = Z_COUNTED_P(zv);
}
if (UNEXPECTED(GC_MAY_LEAK(ref))) {
gc_possible_root(ref);
}
}
/* These APIs can be used to simplify object get_gc implementations
* over heterogeneous structures. See zend_generator_get_gc() for
* a usage example. */
typedef struct {
zval *cur;
zval *end;
zval *start;
} zend_get_gc_buffer;
ZEND_API zend_get_gc_buffer *zend_get_gc_buffer_create(void);
ZEND_API void zend_get_gc_buffer_grow(zend_get_gc_buffer *gc_buffer);
static zend_always_inline void zend_get_gc_buffer_add_zval(
zend_get_gc_buffer *gc_buffer, zval *zv) {
if (Z_REFCOUNTED_P(zv)) {
if (UNEXPECTED(gc_buffer->cur == gc_buffer->end)) {
zend_get_gc_buffer_grow(gc_buffer);
}
ZVAL_COPY_VALUE(gc_buffer->cur, zv);
gc_buffer->cur++;
}
}
static zend_always_inline void zend_get_gc_buffer_add_obj(
zend_get_gc_buffer *gc_buffer, zend_object *obj) {
if (UNEXPECTED(gc_buffer->cur == gc_buffer->end)) {
zend_get_gc_buffer_grow(gc_buffer);
}
ZVAL_OBJ(gc_buffer->cur, obj);
gc_buffer->cur++;
}
static zend_always_inline void zend_get_gc_buffer_use(
zend_get_gc_buffer *gc_buffer, zval **table, int *n) {
*table = gc_buffer->start;
*n = gc_buffer->cur - gc_buffer->start;
}
END_EXTERN_C()
#endif /* ZEND_GC_H */
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