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LCOV - code coverage report
Current view: top level - Zend - zend_gc.h (source / functions) Hit Total Coverage
Test: PHP Code Coverage Lines: 6 6 100.0 %
Date: 2014-04-10 Functions: 0 0 -
Legend: Lines: hit not hit

          Line data    Source code
       1             : /*
       2             :    +----------------------------------------------------------------------+
       3             :    | Zend Engine                                                          |
       4             :    +----------------------------------------------------------------------+
       5             :    | Copyright (c) 1998-2014 Zend Technologies Ltd. (http://www.zend.com) |
       6             :    +----------------------------------------------------------------------+
       7             :    | This source file is subject to version 2.00 of the Zend license,     |
       8             :    | that is bundled with this package in the file LICENSE, and is        |
       9             :    | available through the world-wide-web at the following url:           |
      10             :    | http://www.zend.com/license/2_00.txt.                                |
      11             :    | If you did not receive a copy of the Zend license and are unable to  |
      12             :    | obtain it through the world-wide-web, please send a note to          |
      13             :    | license@zend.com so we can mail you a copy immediately.              |
      14             :    +----------------------------------------------------------------------+
      15             :    | Authors: David Wang <planetbeing@gmail.com>                          |
      16             :    |          Dmitry Stogov <dmitry@zend.com>                             |
      17             :    +----------------------------------------------------------------------+
      18             : */
      19             : 
      20             : /* $Id$ */
      21             : 
      22             : #ifndef ZEND_GC_H
      23             : #define ZEND_GC_H
      24             : 
      25             : #ifndef GC_BENCH
      26             : # define GC_BENCH 0
      27             : #endif
      28             : 
      29             : #if GC_BENCH
      30             : # define GC_BENCH_INC(counter) GC_G(counter)++
      31             : # define GC_BENCH_DEC(counter) GC_G(counter)--
      32             : # define GC_BENCH_PEAK(peak, counter) do {              \
      33             :                 if (GC_G(counter) > GC_G(peak)) {            \
      34             :                         GC_G(peak) = GC_G(counter);                     \
      35             :                 }                                                                               \
      36             :         } while (0)
      37             : #else
      38             : # define GC_BENCH_INC(counter)
      39             : # define GC_BENCH_DEC(counter)
      40             : # define GC_BENCH_PEAK(peak, counter)
      41             : #endif
      42             : 
      43             : #define GC_COLOR  0x03
      44             : 
      45             : #define GC_BLACK  0x00
      46             : #define GC_WHITE  0x01
      47             : #define GC_GREY   0x02
      48             : #define GC_PURPLE 0x03
      49             : 
      50             : #define GC_ADDRESS(v) \
      51             :         ((gc_root_buffer*)(((zend_uintptr_t)(v)) & ~GC_COLOR))
      52             : #define GC_SET_ADDRESS(v, a) \
      53             :         (v) = ((gc_root_buffer*)((((zend_uintptr_t)(v)) & GC_COLOR) | ((zend_uintptr_t)(a))))
      54             : #define GC_GET_COLOR(v) \
      55             :         (((zend_uintptr_t)(v)) & GC_COLOR)
      56             : #define GC_SET_COLOR(v, c) \
      57             :         (v) = ((gc_root_buffer*)((((zend_uintptr_t)(v)) & ~GC_COLOR) | (c)))
      58             : #define GC_SET_BLACK(v) \
      59             :         (v) = ((gc_root_buffer*)(((zend_uintptr_t)(v)) & ~GC_COLOR))
      60             : #define GC_SET_PURPLE(v) \
      61             :         (v) = ((gc_root_buffer*)(((zend_uintptr_t)(v)) | GC_PURPLE))
      62             : 
      63             : #define GC_ZVAL_INIT(z) \
      64             :         ((zval_gc_info*)(z))->u.buffered = NULL
      65             : #define GC_ZVAL_ADDRESS(v) \
      66             :         GC_ADDRESS(((zval_gc_info*)(v))->u.buffered)
      67             : #define GC_ZVAL_SET_ADDRESS(v, a) \
      68             :         GC_SET_ADDRESS(((zval_gc_info*)(v))->u.buffered, (a))
      69             : #define GC_ZVAL_GET_COLOR(v) \
      70             :         GC_GET_COLOR(((zval_gc_info*)(v))->u.buffered)
      71             : #define GC_ZVAL_SET_COLOR(v, c) \
      72             :         GC_SET_COLOR(((zval_gc_info*)(v))->u.buffered, (c))
      73             : #define GC_ZVAL_SET_BLACK(v) \
      74             :         GC_SET_BLACK(((zval_gc_info*)(v))->u.buffered)
      75             : #define GC_ZVAL_SET_PURPLE(v) \
      76             :         GC_SET_PURPLE(((zval_gc_info*)(v))->u.buffered)
      77             : 
      78             : #define GC_OBJ_INIT(z) \
      79             :         (z)->buffered = NULL
      80             : 
      81             : typedef struct _gc_root_buffer {
      82             :         struct _gc_root_buffer   *prev;         /* double-linked list               */
      83             :         struct _gc_root_buffer   *next;
      84             :         zend_object_handle        handle;       /* must be 0 for zval               */
      85             :         union {
      86             :                 zval                 *pz;
      87             :                 const zend_object_handlers *handlers;
      88             :         } u;
      89             : } gc_root_buffer;
      90             : 
      91             : typedef struct _zval_gc_info {
      92             :         zval z;
      93             :         union {
      94             :                 gc_root_buffer       *buffered;
      95             :                 struct _zval_gc_info *next;
      96             :         } u;
      97             : } zval_gc_info;
      98             : 
      99             : typedef struct _zend_gc_globals {
     100             :         zend_bool         gc_enabled;
     101             :         zend_bool         gc_active;
     102             : 
     103             :         gc_root_buffer   *buf;                          /* preallocated arrays of buffers   */
     104             :         gc_root_buffer    roots;                        /* list of possible roots of cycles */
     105             :         gc_root_buffer   *unused;                       /* list of unused buffers           */
     106             :         gc_root_buffer   *first_unused;         /* pointer to first unused buffer   */
     107             :         gc_root_buffer   *last_unused;          /* pointer to last unused buffer    */
     108             : 
     109             :         zval_gc_info     *zval_to_free;         /* temporary list of zvals to free */
     110             :         zval_gc_info     *free_list;
     111             :         zval_gc_info     *next_to_free;
     112             : 
     113             :         zend_uint gc_runs;
     114             :         zend_uint collected;
     115             : 
     116             : #if GC_BENCH
     117             :         zend_uint root_buf_length;
     118             :         zend_uint root_buf_peak;
     119             :         zend_uint zval_possible_root;
     120             :         zend_uint zobj_possible_root;
     121             :         zend_uint zval_buffered;
     122             :         zend_uint zobj_buffered;
     123             :         zend_uint zval_remove_from_buffer;
     124             :         zend_uint zobj_remove_from_buffer;
     125             :         zend_uint zval_marked_grey;
     126             :         zend_uint zobj_marked_grey;
     127             : #endif
     128             : 
     129             : } zend_gc_globals;
     130             : 
     131             : #ifdef ZTS
     132             : BEGIN_EXTERN_C()
     133             : ZEND_API extern int gc_globals_id;
     134             : END_EXTERN_C()
     135             : #define GC_G(v) TSRMG(gc_globals_id, zend_gc_globals *, v)
     136             : #else
     137             : #define GC_G(v) (gc_globals.v)
     138             : extern ZEND_API zend_gc_globals gc_globals;
     139             : #endif
     140             : 
     141             : BEGIN_EXTERN_C()
     142             : ZEND_API int  gc_collect_cycles(TSRMLS_D);
     143             : ZEND_API void gc_zval_possible_root(zval *zv TSRMLS_DC);
     144             : ZEND_API void gc_zobj_possible_root(zval *zv TSRMLS_DC);
     145             : ZEND_API void gc_remove_zval_from_buffer(zval *zv TSRMLS_DC);
     146             : ZEND_API void gc_globals_ctor(TSRMLS_D);
     147             : ZEND_API void gc_globals_dtor(TSRMLS_D);
     148             : ZEND_API void gc_init(TSRMLS_D);
     149             : ZEND_API void gc_reset(TSRMLS_D);
     150             : END_EXTERN_C()
     151             : 
     152             : #define GC_ZVAL_CHECK_POSSIBLE_ROOT(z) \
     153             :         gc_zval_check_possible_root((z) TSRMLS_CC)
     154             : 
     155             : #define GC_REMOVE_FROM_BUFFER(current) \
     156             :         gc_remove_from_buffer((current) TSRMLS_CC)
     157             : 
     158             : #define GC_REMOVE_ZVAL_FROM_BUFFER(z)                                   \
     159             :         if (GC_ADDRESS(((zval_gc_info*)z)->u.buffered)) {    \
     160             :                 gc_remove_zval_from_buffer(z TSRMLS_CC);                \
     161             :         }
     162             : 
     163             : #define GC_ZOBJ_CHECK_POSSIBLE_ROOT(zobject)                                                                    \
     164             :         do {                                                                                                                                            \
     165             :                 if (EXPECTED(EG(objects_store).object_buckets != NULL) &&                               \
     166             :                     EG(objects_store).object_buckets[Z_OBJ_HANDLE_P(zobject)].valid) {  \
     167             :                         gc_zobj_possible_root(zobject TSRMLS_CC);                                                       \
     168             :                 }                                                                                                                                               \
     169             :         } while (0)
     170             : 
     171             : #define GC_REMOVE_ZOBJ_FROM_BUFFER(obj)                                                                 \
     172             :         do {                                                                                                                            \
     173             :                 if (GC_ADDRESS((obj)->buffered) && !GC_G(gc_active)) {                       \
     174             :                         GC_BENCH_INC(zobj_remove_from_buffer);                                          \
     175             :                         GC_REMOVE_FROM_BUFFER(GC_ADDRESS((obj)->buffered));                  \
     176             :                         (obj)->buffered = NULL;                                                                              \
     177             :                 }                                                                                                                               \
     178             :         } while (0)
     179             : 
     180             : static zend_always_inline void gc_zval_check_possible_root(zval *z TSRMLS_DC)
     181             : {
     182    73511498 :         if (z->type == IS_ARRAY || z->type == IS_OBJECT) {
     183    12673946 :                 gc_zval_possible_root(z TSRMLS_CC);
     184             :         }
     185             : }
     186             : 
     187             : static zend_always_inline void gc_remove_from_buffer(gc_root_buffer *root TSRMLS_DC)
     188             : {
     189     3746134 :         root->next->prev = root->prev;
     190     3746134 :         root->prev->next = root->next;
     191     3746134 :         root->prev = GC_G(unused);
     192     3746134 :         GC_G(unused) = root;
     193             :         GC_BENCH_DEC(root_buf_length);
     194             : }
     195             : 
     196             : #define ALLOC_PERMANENT_ZVAL(z)                                                 \
     197             :         do {                                                                                            \
     198             :                 (z) = (zval*)malloc(sizeof(zval_gc_info));              \
     199             :                 GC_ZVAL_INIT(z);                                                                \
     200             :         } while (0)
     201             : 
     202             : /* The following macros override macros from zend_alloc.h */
     203             : #undef  ALLOC_ZVAL
     204             : #define ALLOC_ZVAL(z)                                                                   \
     205             :         do {                                                                                            \
     206             :                 (z) = (zval*)emalloc(sizeof(zval_gc_info));             \
     207             :                 GC_ZVAL_INIT(z);                                                                \
     208             :         } while (0)
     209             : 
     210             : #undef  FREE_ZVAL
     211             : #define FREE_ZVAL(z)                                                                    \
     212             :         do {                                                                                            \
     213             :             GC_REMOVE_ZVAL_FROM_BUFFER(z);                                      \
     214             :                 efree(z);                                                                               \
     215             :         } while (0)
     216             : 
     217             : #undef  ALLOC_ZVAL_REL
     218             : #define ALLOC_ZVAL_REL(z)                                                               \
     219             :         do {                                                                                            \
     220             :                 (z) = (zval*)emalloc_rel(sizeof(zval_gc_info)); \
     221             :                 GC_ZVAL_INIT(z);                                                                \
     222             :         } while (0)
     223             : 
     224             : #undef  FREE_ZVAL_REL
     225             : #define FREE_ZVAL_REL(z)                                                                \
     226             :         do {                                                                                            \
     227             :             GC_REMOVE_ZVAL_FROM_BUFFER(z);                                      \
     228             :                 efree_rel(z);                                                                   \
     229             :         } while (0)
     230             : 
     231             : #define FREE_ZVAL_EX(z)                                                                 \
     232             :         efree(z)
     233             : 
     234             : #define FREE_ZVAL_REL_EX(z)                                                             \
     235             :         efree_rel(z)
     236             : 
     237             : #endif /* ZEND_GC_H */
     238             : 
     239             : /*
     240             :  * Local variables:
     241             :  * tab-width: 4
     242             :  * c-basic-offset: 4
     243             :  * indent-tabs-mode: t
     244             :  * End:
     245             :  */

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