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/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) 1998-2012 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 0x03

#define GC_BLACK 0x00
#define GC_WHITE 0x01
#define GC_GREY 0x02
#define GC_PURPLE 0x03

#define GC_ADDRESS(v) \
((gc_root_buffer*)(((zend_uintptr_t)(v)) & ~GC_COLOR))
#define GC_SET_ADDRESS(v, a) \
(v) = ((gc_root_buffer*)((((zend_uintptr_t)(v)) & GC_COLOR) | ((zend_uintptr_t)(a))))
#define GC_GET_COLOR(v) \
(((zend_uintptr_t)(v)) & GC_COLOR)
#define GC_SET_COLOR(v, c) \
(v) = ((gc_root_buffer*)((((zend_uintptr_t)(v)) & ~GC_COLOR) | (c)))
#define GC_SET_BLACK(v) \
(v) = ((gc_root_buffer*)(((zend_uintptr_t)(v)) & ~GC_COLOR))
#define GC_SET_PURPLE(v) \
(v) = ((gc_root_buffer*)(((zend_uintptr_t)(v)) | GC_PURPLE))

#define GC_ZVAL_INIT(z) \
((zval_gc_info*)(z))->u.buffered = NULL
#define GC_ZVAL_ADDRESS(v) \
GC_ADDRESS(((zval_gc_info*)(v))->u.buffered)
#define GC_ZVAL_SET_ADDRESS(v, a) \
GC_SET_ADDRESS(((zval_gc_info*)(v))->u.buffered, (a))
#define GC_ZVAL_GET_COLOR(v) \
GC_GET_COLOR(((zval_gc_info*)(v))->u.buffered)
#define GC_ZVAL_SET_COLOR(v, c) \
GC_SET_COLOR(((zval_gc_info*)(v))->u.buffered, (c))
#define GC_ZVAL_SET_BLACK(v) \
GC_SET_BLACK(((zval_gc_info*)(v))->u.buffered)
#define GC_ZVAL_SET_PURPLE(v) \
GC_SET_PURPLE(((zval_gc_info*)(v))->u.buffered)

#define GC_OBJ_INIT(z) \
(z)->buffered = NULL

typedef struct _gc_root_buffer {
struct _gc_root_buffer *prev; /* double-linked list */
struct _gc_root_buffer *next;
zend_object_handle handle; /* must be 0 for zval */
union {
zval *pz;
const zend_object_handlers *handlers;
} u;
} gc_root_buffer;

typedef struct _zval_gc_info {
zval z;
union {
gc_root_buffer *buffered;
struct _zval_gc_info *next;
} u;
} zval_gc_info;

typedef struct _zend_gc_globals {
zend_bool gc_enabled;
zend_bool gc_active;

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 */

zval_gc_info *zval_to_free; /* temporaryt list of zvals to free */
zval_gc_info *free_list;
zval_gc_info *next_to_free;

zend_uint gc_runs;
zend_uint collected;

#if GC_BENCH
zend_uint root_buf_length;
zend_uint root_buf_peak;
zend_uint zval_possible_root;
zend_uint zobj_possible_root;
zend_uint zval_buffered;
zend_uint zobj_buffered;
zend_uint zval_remove_from_buffer;
zend_uint zobj_remove_from_buffer;
zend_uint zval_marked_grey;
zend_uint zobj_marked_grey;
#endif

} zend_gc_globals;

#ifdef ZTS
BEGIN_EXTERN_C()
ZEND_API extern int gc_globals_id;
END_EXTERN_C()
#define GC_G(v) 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 int gc_collect_cycles(TSRMLS_D);
ZEND_API void gc_zval_possible_root(zval *zv TSRMLS_DC);
ZEND_API void gc_zobj_possible_root(zval *zv TSRMLS_DC);
ZEND_API void gc_remove_zval_from_buffer(zval *zv TSRMLS_DC);
ZEND_API void gc_globals_ctor(TSRMLS_D);
ZEND_API void gc_globals_dtor(TSRMLS_D);
ZEND_API void gc_init(TSRMLS_D);
ZEND_API void gc_reset(TSRMLS_D);
END_EXTERN_C()

#define GC_ZVAL_CHECK_POSSIBLE_ROOT(z) \
gc_zval_check_possible_root((z) TSRMLS_CC)

#define GC_REMOVE_FROM_BUFFER(current) \
gc_remove_from_buffer((current) TSRMLS_CC)

#define GC_REMOVE_ZVAL_FROM_BUFFER(z) \
if (GC_ADDRESS(((zval_gc_info*)z)->u.buffered)) { \
gc_remove_zval_from_buffer(z TSRMLS_CC); \
}

#define GC_ZOBJ_CHECK_POSSIBLE_ROOT(zobject) \
do { \
if (EXPECTED(EG(objects_store).object_buckets != NULL) && \
EG(objects_store).object_buckets[Z_OBJ_HANDLE_P(zobject)].valid) { \
gc_zobj_possible_root(zobject TSRMLS_CC); \
} \
} while (0)

#define GC_REMOVE_ZOBJ_FROM_BUFFER(obj) \
do { \
if (GC_ADDRESS((obj)->buffered) && !GC_G(gc_active)) { \
GC_BENCH_INC(zobj_remove_from_buffer); \
GC_REMOVE_FROM_BUFFER(GC_ADDRESS((obj)->buffered)); \
(obj)->buffered = NULL; \
} \
} while (0)

static zend_always_inline void gc_zval_check_possible_root(zval *z TSRMLS_DC)
{
if (z->type == IS_ARRAY || z->type == IS_OBJECT) {
gc_zval_possible_root(z TSRMLS_CC);
}
}

static zend_always_inline void gc_remove_from_buffer(gc_root_buffer *root TSRMLS_DC)
{
root->next->prev = root->prev;
root->prev->next = root->next;
root->prev = GC_G(unused);
GC_G(unused) = root;
GC_BENCH_DEC(root_buf_length);
}

#define ALLOC_PERMANENT_ZVAL(z) \
do { \
(z) = (zval*)malloc(sizeof(zval_gc_info)); \
GC_ZVAL_INIT(z); \
} while (0)

/* The following macroses override macroses from zend_alloc.h */
#undef ALLOC_ZVAL
#define ALLOC_ZVAL(z) \
do { \
(z) = (zval*)emalloc(sizeof(zval_gc_info)); \
GC_ZVAL_INIT(z); \
} while (0)

#undef FREE_ZVAL
#define FREE_ZVAL(z) \
do { \
GC_REMOVE_ZVAL_FROM_BUFFER(z); \
efree(z); \
} while (0)

#undef ALLOC_ZVAL_REL
#define ALLOC_ZVAL_REL(z) \
do { \
(z) = (zval*)emalloc_rel(sizeof(zval_gc_info)); \
GC_ZVAL_INIT(z); \
} while (0)

#undef FREE_ZVAL_REL
#define FREE_ZVAL_REL(z) \
do { \
GC_REMOVE_ZVAL_FROM_BUFFER(z); \
efree_rel(z); \
} while (0)

#define FREE_ZVAL_EX(z) \
efree(z)

#define FREE_ZVAL_REL_EX(z) \
efree_rel(z)

#endif /* ZEND_GC_H */

/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* indent-tabs-mode: t
* End:
*/
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