zend_shared_alloc.h

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/*
   +----------------------------------------------------------------------+
   | Zend OPcache                                                         |
   +----------------------------------------------------------------------+
   | Copyright (c) The PHP Group                                          |
   +----------------------------------------------------------------------+
   | This source file is subject to version 3.01 of the PHP license,      |
   | that is bundled with this package in the file LICENSE, and is        |
   | available through the world-wide-web at the following url:           |
   | https://www.php.net/license/3_01.txt                                 |
   | If you did not receive a copy of the PHP license and are unable to   |
   | obtain it through the world-wide-web, please send a note to          |
   | license@php.net so we can mail you a copy immediately.               |
   +----------------------------------------------------------------------+
   | Authors: Andi Gutmans <andi@php.net>                                 |
   |          Zeev Suraski <zeev@php.net>                                 |
   |          Stanislav Malyshev <stas@zend.com>                          |
   |          Dmitry Stogov <dmitry@php.net>                              |
   +----------------------------------------------------------------------+
*/
 
#ifndef ZEND_SHARED_ALLOC_H
#define ZEND_SHARED_ALLOC_H
 
#include "zend.h"
#include "ZendAccelerator.h"
 
#if defined(__APPLE__) && defined(__MACH__) /* darwin */
# ifdef HAVE_SHM_MMAP_POSIX
#  define USE_SHM_OPEN  1
# endif
# ifdef HAVE_SHM_MMAP_ANON
#  define USE_MMAP      1
# endif
#elif defined(__linux__) || defined(_AIX)
# ifdef HAVE_SHM_MMAP_POSIX
#  define USE_SHM_OPEN  1
# endif
# ifdef HAVE_SHM_IPC
#  define USE_SHM       1
# endif
# ifdef HAVE_SHM_MMAP_ANON
#  define USE_MMAP      1
# endif
#elif defined(__sparc) || defined(__sun)
# ifdef HAVE_SHM_MMAP_POSIX
#  define USE_SHM_OPEN  1
# endif
# ifdef HAVE_SHM_IPC
#  define USE_SHM       1
# endif
# if defined(__i386)
#  ifdef HAVE_SHM_MMAP_ANON
#   define USE_MMAP     1
#  endif
# endif
#else
# ifdef HAVE_SHM_MMAP_POSIX
#  define USE_SHM_OPEN  1
# endif
# ifdef HAVE_SHM_MMAP_ANON
#  define USE_MMAP      1
# endif
# ifdef HAVE_SHM_IPC
#  define USE_SHM       1
# endif
#endif
 
#define ALLOC_FAILURE           0
#define ALLOC_SUCCESS           1
#define FAILED_REATTACHED       2
#define SUCCESSFULLY_REATTACHED 4
#define ALLOC_FAIL_MAPPING      8
#define ALLOC_FALLBACK          9
 
typedef struct _zend_shared_segment {
    size_t  size;
    size_t  end;
    size_t  pos;  /* position for simple stack allocator */
    void   *p;
} zend_shared_segment;
 
typedef int (*create_segments_t)(size_t requested_size, zend_shared_segment ***shared_segments, int *shared_segment_count, const char **error_in);
typedef int (*detach_segment_t)(zend_shared_segment *shared_segment);
 
typedef struct {
    create_segments_t create_segments;
    detach_segment_t detach_segment;
    size_t (*segment_type_size)(void);
} zend_shared_memory_handlers;
 
typedef struct _handler_entry {
    const char                  *name;
    const zend_shared_memory_handlers *handler;
} zend_shared_memory_handler_entry;
 
typedef struct _zend_shared_memory_state {
    size_t *positions;  /* current positions for each segment */
    size_t shared_free; /* amount of free shared memory */
} zend_shared_memory_state;
 
typedef struct _zend_smm_shared_globals {
    /* Shared Memory Manager */
    zend_shared_segment      **shared_segments;
    /* Number of allocated shared segments */
    int                        shared_segments_count;
    /* Amount of free shared memory */
    size_t                     shared_free;
    /* Amount of shared memory allocated by garbage */
    size_t                     wasted_shared_memory;
    /* No more shared memory flag */
    bool                  memory_exhausted;
    /* Saved Shared Allocator State */
    zend_shared_memory_state   shared_memory_state;
    /* Pointer to the application's shared data structures */
    void                      *app_shared_globals;
    /* Reserved shared memory */
    void                      *reserved;
    size_t                     reserved_size;
} zend_smm_shared_globals;
 
ZEND_EXT_API extern zend_smm_shared_globals *smm_shared_globals;
 
#define ZSMMG(element)      (smm_shared_globals->element)
 
#define SHARED_ALLOC_REATTACHED     (SUCCESS+1)
 
BEGIN_EXTERN_C()
 
int zend_shared_alloc_startup(size_t requested_size, size_t reserved_size);
void zend_shared_alloc_shutdown(void);
 
/* allocate shared memory block */
void *zend_shared_alloc(size_t size);

static inline void *zend_shared_alloc_aligned(size_t size) {
#if defined(__AVX__) || defined(__SSE2__)
    /* Align to 64-byte boundary */
    void *p = zend_shared_alloc(size + 64);
    return (void *)(((uintptr_t)p + 63L) & ~63L);
#else
    return zend_shared_alloc(size);
#endif
}
 
/* copy into shared memory */
void *zend_shared_memdup_get_put_free(void *source, size_t size);
void *zend_shared_memdup_put_free(void *source, size_t size);
void *zend_shared_memdup_free(void *source, size_t size);
void *zend_shared_memdup_get_put(void *source, size_t size);
void *zend_shared_memdup_put(void *source, size_t size);
void *zend_shared_memdup(void *source, size_t size);
 
int  zend_shared_memdup_size(void *p, size_t size);
 
bool zend_accel_in_shm(void *ptr);
 
typedef union _align_test {
    void   *ptr;
    double  dbl;
    zend_long  lng;
} align_test;
 
#if ZEND_GCC_VERSION >= 2000
# define PLATFORM_ALIGNMENT (__alignof__(align_test) < 8 ? 8 : __alignof__(align_test))
#else
# define PLATFORM_ALIGNMENT (sizeof(align_test))
#endif
 
#define ZEND_ALIGNED_SIZE(size) \
    ZEND_MM_ALIGNED_SIZE_EX(size, PLATFORM_ALIGNMENT)
 
/* exclusive locking */
void zend_shared_alloc_lock(void);
void zend_shared_alloc_unlock(void); /* returns the allocated size during lock..unlock */
void zend_shared_alloc_safe_unlock(void);
 
/* old/new mapping functions */
void zend_shared_alloc_init_xlat_table(void);
void zend_shared_alloc_destroy_xlat_table(void);
void zend_shared_alloc_clear_xlat_table(void);
uint32_t zend_shared_alloc_checkpoint_xlat_table(void);
void zend_shared_alloc_restore_xlat_table(uint32_t checkpoint);
void zend_shared_alloc_register_xlat_entry(const void *key, const void *value);
void *zend_shared_alloc_get_xlat_entry(const void *key);
 
size_t zend_shared_alloc_get_free_memory(void);
void zend_shared_alloc_save_state(void);
void zend_shared_alloc_restore_state(void);
const char *zend_accel_get_shared_model(void);

void zend_accel_shared_protect(bool protected);
 
#ifdef USE_MMAP
extern const zend_shared_memory_handlers zend_alloc_mmap_handlers;
#endif
 
#ifdef USE_SHM
extern const zend_shared_memory_handlers zend_alloc_shm_handlers;
#endif
 
#ifdef USE_SHM_OPEN
extern const zend_shared_memory_handlers zend_alloc_posix_handlers;
#endif
 
#ifdef ZEND_WIN32
extern const zend_shared_memory_handlers zend_alloc_win32_handlers;
void zend_shared_alloc_create_lock(void);
void zend_shared_alloc_lock_win32(void);
void zend_shared_alloc_unlock_win32(void);
#endif
 
END_EXTERN_C()
 
#endif /* ZEND_SHARED_ALLOC_H */