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XCache is a fast, stable PHP opcode cacher that has been proven and is now running on production servers under high load. https://xcache.lighttpd.net/
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xcache/xcache.h

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#ifndef __XCACHE_H
#define __XCACHE_H
#define XCACHE_NAME "XCache"
#define XCACHE_VERSION "2.0.0-dev"
#define XCACHE_AUTHOR "mOo"
#define XCACHE_COPYRIGHT "Copyright (c) 2005-2011"
#define XCACHE_URL "http://xcache.lighttpd.net"
#define XCACHE_WIKI_URL XCACHE_URL "/wiki"
#include <php.h>
#include <zend_compile.h>
#include <zend_API.h>
#include <zend.h>
#include "php_ini.h"
#include "zend_hash.h"
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "xc_shm.h"
#include "lock.h"
#define HAVE_INODE
#if !defined(ZEND_ENGINE_2_4) && (PHP_MAJOR_VERSION == 5 && PHP_MINOR_VERSION >= 4 || PHP_MAJOR_VERSION > 5)
# define ZEND_ENGINE_2_4
#endif
#if !defined(ZEND_ENGINE_2_3) && (PHP_MAJOR_VERSION == 5 && PHP_MINOR_VERSION == 3 || defined(ZEND_ENGINE_2_4))
# define ZEND_ENGINE_2_3
#endif
#if !defined(ZEND_ENGINE_2_2) && (PHP_MAJOR_VERSION == 5 && PHP_MINOR_VERSION == 2 || defined(ZEND_ENGINE_2_3))
# define ZEND_ENGINE_2_2
#endif
#if !defined(ZEND_ENGINE_2_1) && (PHP_MAJOR_VERSION == 5 && PHP_MINOR_VERSION == 1 || defined(ZEND_ENGINE_2_2))
# define ZEND_ENGINE_2_1
#endif
#define NOTHING
/* ZendEngine code Switcher */
#ifndef ZEND_ENGINE_2
# define ZESW(v1, v2) v1
#else
# define ZESW(v1, v2) v2
#endif
#ifdef ZEND_ENGINE_2_4
# define ZEND_24(pre24, v24) v24
#else
# define ZEND_24(pre24, v24) pre24
#endif
#ifdef do_alloca_with_limit
# define my_do_alloca(size, use_heap) do_alloca_with_limit(size, use_heap)
# define my_free_alloca(size, use_heap) free_alloca_with_limit(size, use_heap)
#elif defined(ALLOCA_FLAG)
# define my_do_alloca(size, use_heap) do_alloca(size, use_heap)
# define my_free_alloca(size, use_heap) free_alloca(size, use_heap)
#else
# define my_do_alloca(size, use_heap) do_alloca(size)
# define my_free_alloca(size, use_heap) free_alloca(size)
# define ALLOCA_FLAG(x)
#endif
#ifndef Z_ISREF
# define Z_ISREF(z) (z).is_ref
#endif
#ifndef Z_SET_ISREF
# define Z_SET_ISREF(z) (z).is_ref = 1
#endif
#ifndef Z_UNSET_ISREF
# define Z_UNSET_ISREF(z) (z).is_ref = 0
#endif
#ifndef Z_REFCOUNT
# define Z_REFCOUNT(z) (z).refcount
#endif
#ifndef Z_SET_REFCOUNT
# define Z_SET_REFCOUNT(z, rc) (z).refcount = rc
#endif
#ifndef IS_CONSTANT_TYPE_MASK
# define IS_CONSTANT_TYPE_MASK (~IS_CONSTANT_INDEX)
#endif
/* {{{ dirty fix for PHP 6 */
#ifdef add_assoc_long_ex
static inline void my_add_assoc_long_ex(zval *arg, char *key, uint key_len, long value)
{
add_assoc_long_ex(arg, key, key_len, value);
}
# undef add_assoc_long_ex
# define add_assoc_long_ex my_add_assoc_long_ex
#endif
#ifdef add_assoc_bool_ex
static inline void my_add_assoc_bool_ex(zval *arg, char *key, uint key_len, zend_bool value)
{
add_assoc_bool_ex(arg, key, key_len, value);
}
# undef add_assoc_bool_ex
# define add_assoc_bool_ex my_add_assoc_bool_ex
#endif
#ifdef add_assoc_null_ex
static inline void my_add_assoc_null_ex(zval *arg, char *key, uint key_len)
{
add_assoc_null_ex(arg, key, key_len);
}
# undef add_assoc_null_ex
# define add_assoc_null_ex my_add_assoc_null_ex
#endif
#ifdef ZEND_ENGINE_2_4
# define Z_OP(op) (op)
# define Z_OP_CONSTANT(op) (op).literal->constant
# define Z_OP_TYPE(op) op##_##type
# define Z_OP_TYPEOF_TYPE zend_uchar
# define Z_CLASS_INFO(className) (className).info.user
#else
# define Z_OP(op) (op).u
# define Z_OP_CONSTANT(op) (op).u.constant
# define Z_OP_TYPE(op) (op).op_type
# define Z_OP_TYPEOF_TYPE int
typedef znode znode_op;
# define Z_CLASS_INFO(className) (className)
#endif
/* }}} */
/* unicode */
#ifdef IS_UNICODE
# define UNISW(text, unicode) unicode
#else
# define UNISW(text, unicode) text
#endif
#define BUCKET_KEY_SIZE(b) \
(UNISW( \
(b)->nKeyLength, \
((b)->key.type == IS_UNICODE) \
? UBYTES(b->nKeyLength) \
: b->nKeyLength \
))
#define BUCKET_KEY(b) (UNISW((b)->arKey, (b)->key.arKey))
#define BUCKET_KEY_S(b) ZSTR_S(BUCKET_KEY(b))
#define BUCKET_KEY_U(b) ZSTR_U(BUCKET_KEY(b))
#define BUCKET_KEY_TYPE(b) (UNISW(IS_STRING, (b)->key.type))
#ifdef IS_UNICODE
# define BUCKET_HEAD_SIZE(b) XtOffsetOf(Bucket, key.arKey)
#else
# define BUCKET_HEAD_SIZE(b) XtOffsetOf(Bucket, arKey)
#endif
#ifdef ZEND_ENGINE_2_4
# define BUCKET_SIZE(b) (sizeof(Bucket) + BUCKET_KEY_SIZE(b))
#else
# define BUCKET_SIZE(b) (BUCKET_HEAD_SIZE(b) + BUCKET_KEY_SIZE(b))
#endif
#ifndef IS_UNICODE
typedef char *zstr;
typedef const char *const_zstr;
#ifdef ZEND_ENGINE_2_4
typedef const char *const24_zstr;
typedef const char *const24_str;
#else
typedef char *const24_zstr;
typedef char *const24_str;
#endif
# define ZSTR_S(s) (s)
# define ZSTR_U(s) (s)
# define ZSTR_V(s) (s)
# define ZSTR_PS(s) (s)
# define ZSTR_PU(s) (s)
# define ZSTR_PV(s) (s)
#else
typedef const zstr const_zstr;
# define ZSTR_S(zs) ((zs).s)
# define ZSTR_U(zs) ((zs).u)
# define ZSTR_V(zs) ((zs).v)
# define ZSTR_PS(pzs) ((pzs)->s)
# define ZSTR_PU(pzs) ((pzs)->u)
# define ZSTR_PV(pzs) ((pzs)->v)
#endif
#ifndef ZSTR
# define ZSTR(s) (s)
#endif
#ifndef Z_UNIVAL
# define Z_UNIVAL(zval) (zval).value.str.val
# define Z_UNILEN(zval) (zval).value.str.len
#endif
/* {{{ u hash wrapper */
#ifndef IS_UNICODE
# define zend_u_hash_add(ht, type, arKey, nKeyLength, pData, nDataSize, pDest) \
zend_hash_add(ht, ZEND_24((char *), NOTHING) arKey, nKeyLength, pData, nDataSize, pDest)
# define zend_u_hash_quick_add(ht, type, arKey, nKeyLength, h, pData, nDataSize, pDest) \
zend_hash_quick_add(ht, ZEND_24((char *), NOTHING) arKey, nKeyLength, h, pData, nDataSize, pDest)
# define zend_u_hash_update(ht, type, arKey, nKeyLength, pData, nDataSize, pDest) \
zend_hash_update(ht, ZEND_24((char *), NOTHING) arKey, nKeyLength, pData, nDataSize, pDest)
# define zend_u_hash_quick_update(ht, type, arKey, nKeyLength, h, pData, nDataSize, pDest) \
zend_hash_quick_update(ht, ZEND_24((char *), NOTHING) arKey, nKeyLength, h, pData, nDataSize, pDest)
# define zend_u_hash_find(ht, type, arKey, nKeyLength, pData) \
zend_hash_find(ht, ZEND_24((char *), NOTHING) arKey, nKeyLength, pData)
# define zend_u_hash_quick_find(ht, type, arKey, nKeyLength, h, pData) \
zend_hash_quick_find(ht, ZEND_24((char *), NOTHING) arKey, nKeyLength, h, pData)
# define zend_u_hash_exists(ht, type, arKey, nKeyLength) \
zend_hash_exists(ht, ZEND_24((char *), NOTHING) arKey, nKeyLength)
# define add_u_assoc_zval_ex(arg, type, key, key_len, value) \
add_assoc_zval_ex(arg, key, key_len, value)
# define zend_u_is_auto_global(type, name, name_len) \
zend_is_auto_global(name, name_len)
#endif
/* }}} */
#define ECALLOC_N(x, n) ((x) = ecalloc(n, sizeof((x)[0])))
#define ECALLOC_ONE(x) ECALLOC_N(x, 1)
typedef ulong xc_hash_value_t;
typedef struct {
int bits;
int size;
int mask;
} xc_hash_t;
/* the class entry type to be stored in class_table */
typedef ZESW(zend_class_entry, zend_class_entry*) xc_cest_t;
/* xc_cest_t to (zend_class_entry*) */
#define CestToCePtr(st) (ZESW(\
&(st), \
st \
) )
/* ZCEP=zend class entry ptr */
#define ZCEP_REFCOUNT_PTR(pce) (ZESW( \
(pce)->refcount, \
&((pce)->refcount) \
))
#define ZCE_REFCOUNT_PTR(ce) ZCE_REFCOUNT_PTR(&ce)
typedef zend_op_array *(zend_compile_file_t)(zend_file_handle *h, int type TSRMLS_DC);
typedef struct _xc_entry_t xc_entry_t;
typedef struct _xc_entry_data_php_t xc_entry_data_php_t;
/* {{{ xc_cache_t */
typedef struct {
int cacheid;
xc_hash_t *hcache; /* hash to cacheid */
time_t compiling;
zend_ulong misses;
zend_ulong hits;
zend_ulong clogs;
zend_ulong ooms;
zend_ulong errors;
xc_lock_t *lck;
xc_shm_t *shm; /* which shm contains us */
xc_mem_t *mem; /* which mem contains us */
xc_entry_t **entries;
int entries_count;
xc_entry_data_php_t **phps;
int phps_count;
xc_entry_t *deletes;
int deletes_count;
xc_hash_t *hentry; /* hash settings to entry */
xc_hash_t *hphp; /* hash settings to php */
time_t last_gc_deletes;
time_t last_gc_expires;
time_t hits_by_hour_cur_time;
zend_uint hits_by_hour_cur_slot;
zend_ulong hits_by_hour[24];
time_t hits_by_second_cur_time;
zend_uint hits_by_second_cur_slot;
zend_ulong hits_by_second[5];
} xc_cache_t;
/* }}} */
/* {{{ xc_op_array_info_detail_t */
typedef struct {
zend_uint index;
zend_uint info;
} xc_op_array_info_detail_t;
/* }}} */
/* {{{ xc_op_array_info_t */
typedef struct {
#ifdef ZEND_ENGINE_2_4
zend_uint literalinfo_cnt;
xc_op_array_info_detail_t *literalinfos;
#else
zend_uint oplineinfo_cnt;
xc_op_array_info_detail_t *oplineinfos;
#endif
} xc_op_array_info_t;
/* }}} */
/* {{{ xc_classinfo_t */
typedef struct {
#ifdef IS_UNICODE
zend_uchar type;
#endif
const24_zstr key;
zend_uint key_size;
ulong h;
zend_uint methodinfo_cnt;
xc_op_array_info_t *methodinfos;
xc_cest_t cest;
#ifndef ZEND_COMPILE_DELAYED_BINDING
int oplineno;
#endif
} xc_classinfo_t;
/* }}} */
#ifdef HAVE_XCACHE_CONSTANT
/* {{{ xc_constinfo_t */
typedef struct {
#ifdef IS_UNICODE
zend_uchar type;
#endif
const24_zstr key;
zend_uint key_size;
ulong h;
zend_constant constant;
} xc_constinfo_t;
/* }}} */
#endif
/* {{{ xc_funcinfo_t */
typedef struct {
#ifdef IS_UNICODE
zend_uchar type;
#endif
const24_zstr key;
zend_uint key_size;
ulong h;
xc_op_array_info_t op_array_info;
zend_function func;
} xc_funcinfo_t;
/* }}} */
#ifdef ZEND_ENGINE_2_1
/* {{{ xc_autoglobal_t */
typedef struct {
#ifdef IS_UNICODE
zend_uchar type;
#endif
const24_zstr key;
zend_uint key_len;
ulong h;
} xc_autoglobal_t;
/* }}} */
#endif
typedef struct {
char digest[16];
} xc_md5sum_t;
/* {{{ xc_compilererror_t */
typedef struct {
int type;
uint lineno;
int error_len;
char *error;
} xc_compilererror_t;
/* }}} */
/* {{{ xc_entry_data_php_t */
struct _xc_entry_data_php_t {
xc_entry_data_php_t *next;
xc_hash_value_t hvalue;
xc_md5sum_t md5; /* md5sum of the source */
zend_ulong refcount; /* count of entries referencing to this data */
zend_ulong hits; /* hits of this php */
size_t size;
xc_op_array_info_t op_array_info;
zend_op_array *op_array;
#ifdef HAVE_XCACHE_CONSTANT
zend_uint constinfo_cnt;
xc_constinfo_t *constinfos;
#endif
zend_uint funcinfo_cnt;
xc_funcinfo_t *funcinfos;
zend_uint classinfo_cnt;
xc_classinfo_t *classinfos;
#ifndef ZEND_COMPILE_DELAYED_BINDING
zend_bool have_early_binding;
#endif
#ifdef ZEND_ENGINE_2_1
zend_uint autoglobal_cnt;
xc_autoglobal_t *autoglobals;
#endif
#ifdef E_STRICT
zend_uint compilererror_cnt;
xc_compilererror_t *compilererrors;
#endif
zend_bool have_references;
};
/* }}} */
typedef zvalue_value xc_entry_name_t;
/* {{{ xc_entry_t */
struct _xc_entry_t {
xc_entry_t *next;
size_t size;
time_t ctime; /* creation ctime of this entry */
time_t atime; /* access atime of this entry */
time_t dtime; /* deletion time of this entry */
zend_ulong hits;
long ttl;
xc_entry_name_t name;
};
typedef struct {
xc_entry_t entry;
xc_entry_data_php_t *php;
zend_ulong refcount; /* count of php instances holding this entry */
time_t file_mtime;
size_t file_size;
#ifdef HAVE_INODE
int file_device;
int file_inode;
#endif
int filepath_len;
ZEND_24(NOTHING, const) char *filepath;
int dirpath_len;
char *dirpath;
#ifdef IS_UNICODE
int ufilepath_len;
UChar *ufilepath;
int udirpath_len;
UChar *udirpath;
#endif
} xc_entry_php_t;
typedef struct {
xc_entry_t entry;
#ifdef IS_UNICODE
zend_uchar name_type;
#endif
zval *value;
zend_bool have_references;
} xc_entry_var_t;
/* }}} */
typedef struct xc_entry_hash_t { /* {{{ */
xc_hash_value_t cacheid;
xc_hash_value_t entryslotid;
} xc_entry_hash_t;
/* }}} */
typedef struct xc_compiler_t { /* {{{ */
const char *filename;
size_t filename_len;
const char *opened_path;
char opened_path_buffer[MAXPATHLEN];
xc_entry_hash_t entry_hash;
xc_entry_php_t new_entry;
xc_entry_data_php_t new_php;
} xc_compiler_t;
/* }}} */
extern zend_module_entry xcache_module_entry;
#define phpext_xcache_ptr &xcache_module_entry
int xc_is_rw(const void *p);
int xc_is_ro(const void *p);
int xc_is_shm(const void *p);
/* {{{ xc_gc_op_array_t */
typedef struct {
#ifdef ZEND_ENGINE_2
zend_uint num_args;
zend_arg_info *arg_info;
#endif
zend_op *opcodes;
} xc_gc_op_array_t;
/* }}} */
void xc_gc_add_op_array(xc_gc_op_array_t *gc_op_array TSRMLS_DC);
void xc_fix_op_array_info(const xc_entry_php_t *xce, const xc_entry_data_php_t *php, zend_op_array *op_array, int shallow_copy, const xc_op_array_info_t *op_array_info TSRMLS_DC);
#endif /* __XCACHE_H */