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zend_gc.h
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/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) 1998-2017 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@zend.com> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#ifndef ZEND_GC_H
#define ZEND_GC_H
#ifndef GC_BENCH
# define GC_BENCH 0
#endif
#if GC_BENCH
# define GC_BENCH_INC(counter) GC_G(counter)++
# define GC_BENCH_DEC(counter) GC_G(counter)--
# define GC_BENCH_PEAK(peak, counter) do { \
if (GC_G(counter) > GC_G(peak)) { \
GC_G(peak) = GC_G(counter); \
} \
} while (0)
#else
# define GC_BENCH_INC(counter)
# define GC_BENCH_DEC(counter)
# define GC_BENCH_PEAK(peak, counter)
#endif
#define GC_COLOR 0xc000
#define GC_BLACK 0x0000
#define GC_WHITE 0x8000
#define GC_GREY 0x4000
#define GC_PURPLE 0xc000
#define GC_ADDRESS(v) \
((v) & ~GC_COLOR)
#define GC_INFO_GET_COLOR(v) \
(((zend_uintptr_t)(v)) & GC_COLOR)
#define GC_INFO_SET_ADDRESS(v, a) \
do {(v) = ((v) & GC_COLOR) | (a);} while (0)
#define GC_INFO_SET_COLOR(v, c) \
do {(v) = ((v) & ~GC_COLOR) | (c);} while (0)
#define GC_INFO_SET_BLACK(v) \
do {(v) = (v) & ~GC_COLOR;} while (0)
#define GC_INFO_SET_PURPLE(v) \
do {(v) = (v) | GC_COLOR;} while (0)
typedef struct _gc_root_buffer {
zend_refcounted *ref;
struct _gc_root_buffer *next; /* double-linked list */
struct _gc_root_buffer *prev;
uint32_t refcount;
} gc_root_buffer;
#define GC_NUM_ADDITIONAL_ENTRIES \
((4096 - ZEND_MM_OVERHEAD - sizeof(void*) * 2) / sizeof(gc_root_buffer))
typedef struct _gc_additional_bufer gc_additional_buffer;
struct _gc_additional_bufer {
uint32_t used;
gc_additional_buffer *next;
gc_root_buffer buf[GC_NUM_ADDITIONAL_ENTRIES];
};
typedef struct _zend_gc_globals {
zend_bool gc_enabled;
zend_bool gc_active;
zend_bool gc_full;
gc_root_buffer *buf; /* preallocated arrays of buffers */
gc_root_buffer roots; /* list of possible roots of cycles */
gc_root_buffer *unused; /* list of unused buffers */
gc_root_buffer *first_unused; /* pointer to first unused buffer */
gc_root_buffer *last_unused; /* pointer to last unused buffer */
gc_root_buffer to_free; /* list to free */
gc_root_buffer *next_to_free;
uint32_t gc_runs;
uint32_t collected;
#if GC_BENCH
uint32_t root_buf_length;
uint32_t root_buf_peak;
uint32_t zval_possible_root;
uint32_t zval_buffered;
uint32_t zval_remove_from_buffer;
uint32_t zval_marked_grey;
#endif
gc_additional_buffer *additional_buffer;
} zend_gc_globals;
#ifdef ZTS
BEGIN_EXTERN_C()
ZEND_API extern int gc_globals_id;
END_EXTERN_C()
#define GC_G(v) ZEND_TSRMG(gc_globals_id, zend_gc_globals *, v)
#else
#define GC_G(v) (gc_globals.v)
extern ZEND_API zend_gc_globals gc_globals;
#endif
BEGIN_EXTERN_C()
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);
ZEND_API void gc_globals_ctor(void);
ZEND_API void gc_globals_dtor(void);
ZEND_API void gc_init(void);
ZEND_API void gc_reset(void);
/* The default implementation of the gc_collect_cycles callback. */
ZEND_API int zend_gc_collect_cycles(void);
END_EXTERN_C()
#define GC_REMOVE_FROM_BUFFER(p) do { \
zend_refcounted *_p = (zend_refcounted*)(p); \
if (GC_ADDRESS(GC_INFO(_p))) { \
gc_remove_from_buffer(_p); \
} \
} while (0)
#define GC_MAY_LEAK(ref) \
((GC_TYPE_INFO(ref) & \
(GC_INFO_MASK | (GC_COLLECTABLE << GC_FLAGS_SHIFT))) == \
(GC_COLLECTABLE << GC_FLAGS_SHIFT))
static zend_always_inline void gc_check_possible_root(zend_refcounted *ref)
{
if (GC_TYPE(ref) == IS_REFERENCE) {
zval *zv = &((zend_reference*)ref)->val;
if (!Z_REFCOUNTED_P(zv)) {
return;
}
ref = Z_COUNTED_P(zv);
}
if (UNEXPECTED(GC_MAY_LEAK(ref))) {
gc_possible_root(ref);
}
}
#endif /* ZEND_GC_H */
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* indent-tabs-mode: t
* End:
*/