xcache/xcache.c

#if 0
#define XCACHE_DEBUG
#endif

#if 0
#define SHOW_DPRINT
#endif

/* {{{ macros */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include <signal.h>

#include "php.h"
#include "ext/standard/info.h"
#include "ext/standard/md5.h"
#include "ext/standard/php_math.h"
#include "ext/standard/php_string.h"
#include "zend_extensions.h"
#include "SAPI.h"

#include "xcache.h"
#ifdef ZEND_ENGINE_2_1
#include "ext/date/php_date.h"
#endif
#include "optimizer.h"
#include "coverager.h"
#include "disassembler.h"
#include "align.h"
#include "stack.h"
#include "xcache_globals.h"
#include "processor.h"
#include "const_string.h"
#include "opcode_spec.h"
#include "utils.h"

#ifndef ZEND_ENGINE_2_3
ZEND_API size_t zend_dirname(char *path, size_t len)
{
	php_dirname(path, len);
	return strlen(path);
}
#endif

#define VAR_ENTRY_EXPIRED(pentry) ((pentry)->ttl && XG(request_time) > pentry->ctime + (pentry)->ttl)
#define CHECK(x, e) do { if ((x) == NULL) { zend_error(E_ERROR, "XCache: " e); goto err; } } while (0)
#define LOCK(x) xc_lock(x->lck)
#define UNLOCK(x) xc_unlock(x->lck)

#define ENTER_LOCK_EX(x) \
	xc_lock(x->lck); \
	zend_try { \
		do
#define LEAVE_LOCK_EX(x) \
		while (0); \
	} zend_catch { \
		catched = 1; \
	} zend_end_try(); \
	xc_unlock(x->lck)

#define ENTER_LOCK(x) do { \
	int catched = 0; \
	ENTER_LOCK_EX(x)
#define LEAVE_LOCK(x) \
	LEAVE_LOCK_EX(x); \
	if (catched) { \
		zend_bailout(); \
	} \
} while(0)

/* }}} */

/* {{{ globals */
static char *xc_shm_scheme = NULL;
static char *xc_mmap_path = NULL;
static char *xc_coredump_dir = NULL;

static xc_hash_t xc_php_hcache = {0};
static xc_hash_t xc_php_hentry = {0};
static xc_hash_t xc_var_hcache = {0};
static xc_hash_t xc_var_hentry = {0};

static zend_ulong xc_php_ttl    = 0;
static zend_ulong xc_var_maxttl = 0;

enum { xc_deletes_gc_interval = 120 };
static zend_ulong xc_php_gc_interval = 0;
static zend_ulong xc_var_gc_interval = 0;

/* total size */
static zend_ulong xc_php_size  = 0;
static zend_ulong xc_var_size  = 0;

static xc_cache_t **xc_php_caches = NULL;
static xc_cache_t **xc_var_caches = NULL;

static zend_bool xc_initized = 0;
static time_t xc_init_time = 0;
static long unsigned xc_init_instance_id = 0;
#ifdef ZTS
static long unsigned xc_init_instance_subid = 0;
#endif
static zend_compile_file_t *origin_compile_file = NULL;
static zend_compile_file_t *old_compile_file = NULL;
static zend_llist_element  *xc_llist_zend_extension = NULL;

static zend_bool xc_test = 0;
static zend_bool xc_readonly_protection = 0;

zend_bool xc_have_op_array_ctor = 0;

static zend_bool xc_module_gotup = 0;
static zend_bool xc_zend_extension_gotup = 0;
static zend_bool xc_zend_extension_faked = 0;
#if !COMPILE_DL_XCACHE
#	define zend_extension_entry xcache_zend_extension_entry
#endif
ZEND_DLEXPORT zend_extension zend_extension_entry;
ZEND_DECLARE_MODULE_GLOBALS(xcache);
/* }}} */

/* any function in *_dmz is only safe be called within locked(single thread) area */

static void xc_php_add_dmz(xc_entry_data_php_t *php) /* {{{ */
{
	xc_entry_data_php_t **head = &(php->cache->phps[php->hvalue]);
	php->next = *head;
	*head = php;
	php->cache->phps_count ++;
}
/* }}} */
static xc_entry_data_php_t *xc_php_store_dmz(xc_entry_data_php_t *php TSRMLS_DC) /* {{{ */
{
	xc_entry_data_php_t *stored_php;

	php->hits     = 0;
	php->refcount = 0;
	stored_php = xc_processor_store_xc_entry_data_php_t(php TSRMLS_CC);
	if (stored_php) {
		xc_php_add_dmz(stored_php);
		return stored_php;
	}
	else {
		php->cache->ooms ++;
		return NULL;
	}
}
/* }}} */
static xc_entry_data_php_t *xc_php_find_dmz(xc_entry_data_php_t *php TSRMLS_DC) /* {{{ */
{
	xc_entry_data_php_t *p;
	for (p = php->cache->phps[php->hvalue]; p; p = p->next) {
		if (memcmp(php->md5, p->md5, sizeof(php->md5)) == 0) {
			p->hits ++;
			return p;
		}
	}
	return NULL;
}
/* }}} */
static void xc_php_free_dmz(xc_entry_data_php_t *php) /* {{{ */
{
	php->cache->mem->handlers->free(php->cache->mem, (xc_entry_data_php_t *)php);
}
/* }}} */
static void xc_php_addref_dmz(xc_entry_data_php_t *php) /* {{{ */
{
	php->refcount ++;
}
/* }}} */
static void xc_php_release_dmz(xc_entry_data_php_t *php) /* {{{ */
{
	if (-- php->refcount == 0) {
		xc_entry_data_php_t **pp = &(php->cache->phps[php->hvalue]);
		xc_entry_data_php_t *p;
		for (p = *pp; p; pp = &(p->next), p = p->next) {
			if (memcmp(php->md5, p->md5, sizeof(php->md5)) == 0) {
				/* unlink */
				*pp = p->next;
				xc_php_free_dmz(php);
				return;
			}
		}
		assert(0);
	}
}
/* }}} */

static inline int xc_entry_equal_dmz(xc_entry_t *a, xc_entry_t *b) /* {{{ */
{
	/* this function isn't required but can be in dmz */

	if (a->type != b->type) {
		return 0;
	}
	switch (a->type) {
		case XC_TYPE_PHP:
#ifdef HAVE_INODE
			do {
				if (a->inode) {
					return a->inode == b->inode
						&& a->device == b->device;
				}
			} while(0);
#endif
			/* fall */

		case XC_TYPE_VAR:
			do {
#ifdef IS_UNICODE
				if (a->name_type == IS_UNICODE) {
					if (a->name.ustr.len != b->name.ustr.len) {
						return 0;
					}
					return memcmp(a->name.ustr.val, b->name.ustr.val, (a->name.ustr.len + 1) * sizeof(UChar)) == 0;
				}
				else {
					return memcmp(a->name.str.val, b->name.str.val, a->name.str.len + 1) == 0;
				}
#else
				return memcmp(a->name.str.val, b->name.str.val, a->name.str.len + 1) == 0;
#endif

			} while(0);
		default:
			assert(0);
	}
	return 0;
}
/* }}} */
static void xc_entry_add_dmz(xc_entry_t *xce) /* {{{ */
{
	xc_entry_t **head = &(xce->cache->entries[xce->hvalue]);
	xce->next = *head;
	*head = xce;
	xce->cache->entries_count ++;
}
/* }}} */
static xc_entry_t *xc_entry_store_dmz(xc_entry_t *xce TSRMLS_DC) /* {{{ */
{
	xc_entry_t *stored_xce;

	xce->hits  = 0;
	xce->ctime = XG(request_time);
	xce->atime = XG(request_time);
	stored_xce = xc_processor_store_xc_entry_t(xce TSRMLS_CC);
	if (stored_xce) {
		xc_entry_add_dmz(stored_xce);
		return stored_xce;
	}
	else {
		xce->cache->ooms ++;
		return NULL;
	}
}
/* }}} */
static void xc_entry_free_real_dmz(volatile xc_entry_t *xce) /* {{{ */
{
	if (xce->type == XC_TYPE_PHP) {
		xc_php_release_dmz(xce->data.php);
	}
	xce->cache->mem->handlers->free(xce->cache->mem, (xc_entry_t *)xce);
}
/* }}} */
static void xc_entry_free_dmz(xc_entry_t *xce TSRMLS_DC) /* {{{ */
{
	xce->cache->entries_count --;
	if (xce->refcount == 0) {
		xc_entry_free_real_dmz(xce);
	}
	else {
		xce->next = xce->cache->deletes;
		xce->cache->deletes = xce;
		xce->dtime = XG(request_time);
		xce->cache->deletes_count ++;
	}
	return;
}
/* }}} */
static void xc_entry_remove_dmz(xc_entry_t *xce TSRMLS_DC) /* {{{ */
{
	xc_entry_t **pp = &(xce->cache->entries[xce->hvalue]);
	xc_entry_t *p;
	for (p = *pp; p; pp = &(p->next), p = p->next) {
		if (xc_entry_equal_dmz(xce, p)) {
			/* unlink */
			*pp = p->next;
			xc_entry_free_dmz(xce TSRMLS_CC);
			return;
		}
	}
	assert(0);
}
/* }}} */
static xc_entry_t *xc_entry_find_dmz(xc_entry_t *xce TSRMLS_DC) /* {{{ */
{
	xc_entry_t *p;
	for (p = xce->cache->entries[xce->hvalue]; p; p = p->next) {
		if (xc_entry_equal_dmz(xce, p)) {
			if (p->type == XC_TYPE_VAR || /* PHP */ (p->mtime == xce->mtime && p->data.php->sourcesize == xce->data.php->sourcesize)) {
				p->hits ++;
				p->atime = XG(request_time);
				return p;
			}
			else {
				xc_entry_remove_dmz(p TSRMLS_CC);
				return NULL;
			}
		}
	}
	return NULL;
}
/* }}} */
static void xc_entry_hold_php_dmz(xc_entry_t *xce TSRMLS_DC) /* {{{ */
{
	TRACE("hold %s", xce->name.str.val);
	xce->refcount ++;
	xc_stack_push(&XG(php_holds)[xce->cache->cacheid], (void *)xce);
}
/* }}} */
#if 0
static void xc_entry_hold_var_dmz(xc_entry_t *xce TSRMLS_DC) /* {{{ */
{
	xce->refcount ++;
	xc_stack_push(&XG(var_holds)[xce->cache->cacheid], (void *)xce);
}
/* }}} */
#endif
static inline zend_uint advance_wrapped(zend_uint val, zend_uint count) /* {{{ */
{
	if (val + 1 >= count) {
		return 0;
	}
	return val + 1;
}
/* }}} */
static void xc_counters_inc(time_t *curtime, zend_uint *curslot, time_t period, zend_ulong *counters, zend_uint count TSRMLS_DC) /* {{{ */
{
	time_t n = XG(request_time) / period;
	if (*curtime != n) {
		zend_uint target_slot = n % count;
		if (n - *curtime > period) {
			memset(counters, 0, sizeof(counters[0]) * count);
		}
		else {
			zend_uint slot;
			for (slot = advance_wrapped(*curslot, count);
					slot != target_slot;
					slot = advance_wrapped(slot, count)) {
				counters[slot] = 0;
			}
			counters[target_slot] = 0;
		}
		*curtime = n;
		*curslot = target_slot;
	}
	counters[*curslot] ++;
}
/* }}} */
static void xc_cache_hit_dmz(xc_cache_t *cache TSRMLS_DC) /* {{{ */
{
	cache->hits ++;

	xc_counters_inc(&cache->hits_by_hour_cur_time
			, &cache->hits_by_hour_cur_slot, 60 * 60
			, cache->hits_by_hour
			, sizeof(cache->hits_by_hour) / sizeof(cache->hits_by_hour[0])
			TSRMLS_CC);

	xc_counters_inc(&cache->hits_by_second_cur_time
			, &cache->hits_by_second_cur_slot
			, 1
			, cache->hits_by_second
			, sizeof(cache->hits_by_second) / sizeof(cache->hits_by_second[0])
			TSRMLS_CC);
}
/* }}} */

/* helper function that loop through each entry */
#define XC_ENTRY_APPLY_FUNC(name) int name(xc_entry_t *entry TSRMLS_DC)
typedef XC_ENTRY_APPLY_FUNC((*cache_apply_dmz_func_t));
static void xc_entry_apply_dmz(xc_cache_t *cache, cache_apply_dmz_func_t apply_func TSRMLS_DC) /* {{{ */
{
	xc_entry_t *p, **pp;
	int i, c;

	for (i = 0, c = cache->hentry->size; i < c; i ++) {
		pp = &(cache->entries[i]);
		for (p = *pp; p; p = *pp) {
			if (apply_func(p TSRMLS_CC)) {
				/* unlink */
				*pp = p->next;
				xc_entry_free_dmz(p TSRMLS_CC);
			}
			else {
				pp = &(p->next);
			}
		}
	}
}
/* }}} */

#define XC_CACHE_APPLY_FUNC(name) void name(xc_cache_t *cache TSRMLS_DC)
/* call graph:
 * xc_gc_expires_php -> xc_gc_expires_one -> xc_entry_apply_dmz -> xc_gc_expires_php_entry_dmz
 * xc_gc_expires_var -> xc_gc_expires_one -> xc_entry_apply_dmz -> xc_gc_expires_var_entry_dmz
 */
static XC_ENTRY_APPLY_FUNC(xc_gc_expires_php_entry_dmz) /* {{{ */
{
	TRACE("ttl %lu, %lu %lu", (zend_ulong) XG(request_time), (zend_ulong) entry->atime, xc_php_ttl);
	if (XG(request_time) > entry->atime + xc_php_ttl) {
		return 1;
	}
	return 0;
}
/* }}} */
static XC_ENTRY_APPLY_FUNC(xc_gc_expires_var_entry_dmz) /* {{{ */
{
	if (VAR_ENTRY_EXPIRED(entry)) {
		return 1;
	}
	return 0;
}
/* }}} */
static void xc_gc_expires_one(xc_cache_t *cache, zend_ulong gc_interval, cache_apply_dmz_func_t apply_func TSRMLS_DC) /* {{{ */
{
	TRACE("interval %lu, %lu %lu", (zend_ulong) XG(request_time), (zend_ulong) cache->last_gc_expires, gc_interval);
	if (XG(request_time) - cache->last_gc_expires >= gc_interval) {
		ENTER_LOCK(cache) {
			if (XG(request_time) - cache->last_gc_expires >= gc_interval) {
				cache->last_gc_expires = XG(request_time);
				xc_entry_apply_dmz(cache, apply_func TSRMLS_CC);
			}
		} LEAVE_LOCK(cache);
	}
}
/* }}} */
static void xc_gc_expires_php(TSRMLS_D) /* {{{ */
{
	int i, c;

	if (!xc_php_ttl || !xc_php_gc_interval || !xc_php_caches) {
		return;
	}

	for (i = 0, c = xc_php_hcache.size; i < c; i ++) {
		xc_gc_expires_one(xc_php_caches[i], xc_php_gc_interval, xc_gc_expires_php_entry_dmz TSRMLS_CC);
	}
}
/* }}} */
static void xc_gc_expires_var(TSRMLS_D) /* {{{ */
{
	int i, c;

	if (!xc_var_gc_interval || !xc_var_caches) {
		return;
	}

	for (i = 0, c = xc_var_hcache.size; i < c; i ++) {
		xc_gc_expires_one(xc_var_caches[i], xc_var_gc_interval, xc_gc_expires_var_entry_dmz TSRMLS_CC);
	}
}
/* }}} */

static XC_CACHE_APPLY_FUNC(xc_gc_delete_dmz) /* {{{ */
{
	xc_entry_t *p, **pp;

	pp = &cache->deletes;
	for (p = *pp; p; p = *pp) {
		if (XG(request_time) - p->dtime > 3600) {
			p->refcount = 0;
			/* issue warning here */
		}
		if (p->refcount == 0) {
			/* unlink */
			*pp = p->next;
			cache->deletes_count --;
			xc_entry_free_real_dmz(p);
		}
		else {
			pp = &(p->next);
		}
	}
}
/* }}} */
static XC_CACHE_APPLY_FUNC(xc_gc_deletes_one) /* {{{ */
{
	if (cache->deletes && XG(request_time) - cache->last_gc_deletes > xc_deletes_gc_interval) {
		ENTER_LOCK(cache) {
			if (cache->deletes && XG(request_time) - cache->last_gc_deletes > xc_deletes_gc_interval) {
				cache->last_gc_deletes = XG(request_time);
				xc_gc_delete_dmz(cache TSRMLS_CC);
			}
		} LEAVE_LOCK(cache);
	}
}
/* }}} */
static void xc_gc_deletes(TSRMLS_D) /* {{{ */
{
	int i, c;

	if (xc_php_caches) {
		for (i = 0, c = xc_php_hcache.size; i < c; i ++) {
			xc_gc_deletes_one(xc_php_caches[i] TSRMLS_CC);
		}
	}

	if (xc_var_caches) {
		for (i = 0, c = xc_var_hcache.size; i < c; i ++) {
			xc_gc_deletes_one(xc_var_caches[i] TSRMLS_CC);
		}
	}
}
/* }}} */

/* helper functions for user functions */
static void xc_fillinfo_dmz(int cachetype, xc_cache_t *cache, zval *return_value TSRMLS_DC) /* {{{ */
{
	zval *blocks, *hits;
	int i;
	const xc_block_t *b;
#ifndef NDEBUG
	xc_memsize_t avail = 0;
#endif
	xc_mem_t *mem = cache->mem;
	const xc_mem_handlers_t *handlers = mem->handlers;
	zend_ulong interval;
	if (cachetype == XC_TYPE_PHP) {
		interval = xc_php_ttl ? xc_php_gc_interval : 0;
	}
	else {
		interval = xc_var_gc_interval;
	}

	add_assoc_long_ex(return_value, ZEND_STRS("slots"),     cache->hentry->size);
	add_assoc_long_ex(return_value, ZEND_STRS("compiling"), cache->compiling);
	add_assoc_long_ex(return_value, ZEND_STRS("misses"),    cache->misses);
	add_assoc_long_ex(return_value, ZEND_STRS("hits"),      cache->hits);
	add_assoc_long_ex(return_value, ZEND_STRS("clogs"),     cache->clogs);
	add_assoc_long_ex(return_value, ZEND_STRS("ooms"),      cache->ooms);
	add_assoc_long_ex(return_value, ZEND_STRS("errors"),    cache->errors);

	add_assoc_long_ex(return_value, ZEND_STRS("cached"),    cache->entries_count);
	add_assoc_long_ex(return_value, ZEND_STRS("deleted"),   cache->deletes_count);
	if (interval) {
		time_t gc = (cache->last_gc_expires + interval) - XG(request_time);
		add_assoc_long_ex(return_value, ZEND_STRS("gc"),    gc > 0 ? gc : 0);
	}
	else {
		add_assoc_null_ex(return_value, ZEND_STRS("gc"));
	}
	MAKE_STD_ZVAL(hits);
	array_init(hits);
	for (i = 0; i < sizeof(cache->hits_by_hour) / sizeof(cache->hits_by_hour[0]); i ++) {
		add_next_index_long(hits, (long) cache->hits_by_hour[i]);
	}
	add_assoc_zval_ex(return_value, ZEND_STRS("hits_by_hour"), hits);

	MAKE_STD_ZVAL(hits);
	array_init(hits);
	for (i = 0; i < sizeof(cache->hits_by_second) / sizeof(cache->hits_by_second[0]); i ++) {
		add_next_index_long(hits, (long) cache->hits_by_second[i]);
	}
	add_assoc_zval_ex(return_value, ZEND_STRS("hits_by_second"), hits);

	MAKE_STD_ZVAL(blocks);
	array_init(blocks);

	add_assoc_long_ex(return_value, ZEND_STRS("size"),  handlers->size(mem));
	add_assoc_long_ex(return_value, ZEND_STRS("avail"), handlers->avail(mem));
	add_assoc_bool_ex(return_value, ZEND_STRS("can_readonly"), xc_readonly_protection);

	for (b = handlers->freeblock_first(mem); b; b = handlers->freeblock_next(b)) {
		zval *bi;

		MAKE_STD_ZVAL(bi);
		array_init(bi);

		add_assoc_long_ex(bi, ZEND_STRS("size"),   handlers->block_size(b));
		add_assoc_long_ex(bi, ZEND_STRS("offset"), handlers->block_offset(mem, b));
		add_next_index_zval(blocks, bi);
#ifndef NDEBUG
		avail += handlers->block_size(b);
#endif
	}
	add_assoc_zval_ex(return_value, ZEND_STRS("free_blocks"), blocks);
#ifndef NDEBUG
	assert(avail == handlers->avail(mem));
#endif
}
/* }}} */
static void xc_fillentry_dmz(xc_entry_t *entry, int del, zval *list TSRMLS_DC) /* {{{ */
{
	zval* ei;
	xc_entry_data_php_t *php;
	xc_entry_data_var_t *var;

	ALLOC_INIT_ZVAL(ei);
	array_init(ei);

	add_assoc_long_ex(ei, ZEND_STRS("refcount"), entry->refcount);
	add_assoc_long_ex(ei, ZEND_STRS("hits"),     entry->hits);
	add_assoc_long_ex(ei, ZEND_STRS("ctime"),    entry->ctime);
	add_assoc_long_ex(ei, ZEND_STRS("atime"),    entry->atime);
	add_assoc_long_ex(ei, ZEND_STRS("hvalue"),   entry->hvalue);
	if (del) {
		add_assoc_long_ex(ei, ZEND_STRS("dtime"), entry->dtime);
	}
#ifdef IS_UNICODE
	do {
		zval *zv;
		ALLOC_INIT_ZVAL(zv);
		switch (entry->name_type) {
			case IS_UNICODE:
					ZVAL_UNICODEL(zv, entry->name.ustr.val, entry->name.ustr.len, 1);
				break;
			case IS_STRING:
				ZVAL_STRINGL(zv, entry->name.str.val, entry->name.str.len, 1);
				break;
			default:
				assert(0);
		}
		zv->type = entry->name_type;
		add_assoc_zval_ex(ei, ZEND_STRS("name"), zv);
	} while (0);
#else
	add_assoc_stringl_ex(ei, ZEND_STRS("name"), entry->name.str.val, entry->name.str.len, 1);
#endif
	switch (entry->type) {
		case XC_TYPE_PHP:
			php = entry->data.php;
			add_assoc_long_ex(ei, ZEND_STRS("size"),          entry->size + php->size);
			add_assoc_long_ex(ei, ZEND_STRS("phprefcount"),   php->refcount);
			add_assoc_long_ex(ei, ZEND_STRS("sourcesize"),    php->sourcesize);
#ifdef HAVE_INODE
			add_assoc_long_ex(ei, ZEND_STRS("device"),        entry->device);
			add_assoc_long_ex(ei, ZEND_STRS("inode"),         entry->inode);
#endif
			add_assoc_long_ex(ei, ZEND_STRS("mtime"),         entry->mtime);

#ifdef HAVE_XCACHE_CONSTANT
			add_assoc_long_ex(ei, ZEND_STRS("constinfo_cnt"), php->constinfo_cnt);
#endif
			add_assoc_long_ex(ei, ZEND_STRS("function_cnt"),  php->funcinfo_cnt);
			add_assoc_long_ex(ei, ZEND_STRS("class_cnt"),     php->classinfo_cnt);
#ifdef ZEND_ENGINE_2_1
			add_assoc_long_ex(ei, ZEND_STRS("autoglobal_cnt"),php->autoglobal_cnt);
#endif
			break;

		case XC_TYPE_VAR:
			var = entry->data.var;
			add_assoc_long_ex(ei, ZEND_STRS("size"),          entry->size);
			break;

		default:
			assert(0);
	}

	add_next_index_zval(list, ei);
}
/* }}} */
static void xc_filllist_dmz(xc_cache_t *cache, zval *return_value TSRMLS_DC) /* {{{ */
{
	zval* list;
	int i, c;
	xc_entry_t *e;

	ALLOC_INIT_ZVAL(list);
	array_init(list);

	for (i = 0, c = cache->hentry->size; i < c; i ++) {
		for (e = cache->entries[i]; e; e = e->next) {
			xc_fillentry_dmz(e, 0, list TSRMLS_CC);
		}
	}
	add_assoc_zval(return_value, "cache_list", list);

	ALLOC_INIT_ZVAL(list);
	array_init(list);
	for (e = cache->deletes; e; e = e->next) {
		xc_fillentry_dmz(e, 1, list TSRMLS_CC);
	}
	add_assoc_zval(return_value, "deleted_list", list);
}
/* }}} */

static zend_op_array *xc_entry_install(xc_entry_t *xce, zend_file_handle *h TSRMLS_DC) /* {{{ */
{
	zend_uint i;
	xc_entry_data_php_t *p = xce->data.php;
	zend_op_array *old_active_op_array = CG(active_op_array);
#ifndef ZEND_ENGINE_2
	ALLOCA_FLAG(use_heap)
	/* new ptr which is stored inside CG(class_table) */
	xc_cest_t **new_cest_ptrs = (xc_cest_t **)my_do_alloca(sizeof(xc_cest_t*) * p->classinfo_cnt, use_heap);
#endif

	CG(active_op_array) = p->op_array;

#ifdef HAVE_XCACHE_CONSTANT
	/* install constant */
	for (i = 0; i < p->constinfo_cnt; i ++) {
		xc_constinfo_t *ci = &p->constinfos[i];
		xc_install_constant(xce->name.str.val, &ci->constant,
				UNISW(0, ci->type), ci->key, ci->key_size, ci->h TSRMLS_CC);
	}
#endif

	/* install function */
	for (i = 0; i < p->funcinfo_cnt; i ++) {
		xc_funcinfo_t  *fi = &p->funcinfos[i];
		xc_install_function(xce->name.str.val, &fi->func,
				UNISW(0, fi->type), fi->key, fi->key_size, fi->h TSRMLS_CC);
	}

	/* install class */
	for (i = 0; i < p->classinfo_cnt; i ++) {
		xc_classinfo_t *ci = &p->classinfos[i];
#ifndef ZEND_ENGINE_2
		zend_class_entry *ce = CestToCePtr(ci->cest);
		/* fix pointer to the be which inside class_table */
		if (ce->parent) {
			zend_uint class_idx = (/* class_num */ (int) (long) ce->parent) - 1;
			assert(class_idx < i);
			ci->cest.parent = new_cest_ptrs[class_idx];
		}
		new_cest_ptrs[i] =
#endif
#ifdef ZEND_COMPILE_DELAYED_BINDING
		xc_install_class(xce->name.str.val, &ci->cest, -1,
				UNISW(0, ci->type), ci->key, ci->key_size, ci->h TSRMLS_CC);
#else
		xc_install_class(xce->name.str.val, &ci->cest, ci->oplineno,
				UNISW(0, ci->type), ci->key, ci->key_size, ci->h TSRMLS_CC);
#endif
	}

#ifdef ZEND_ENGINE_2_1
	/* trigger auto_globals jit */
	for (i = 0; i < p->autoglobal_cnt; i ++) {
		xc_autoglobal_t *aginfo = &p->autoglobals[i];
		/*
		zend_auto_global *auto_global;
		if (zend_u_hash_quick_find(CG(auto_globals), aginfo->type, aginfo->key, aginfo->key_len+1, aginfo->h, (void **) &auto_global)==SUCCESS) {
			if (auto_global->armed) {
				auto_global->armed = auto_global->auto_global_callback(auto_global->name, auto_global->name_len TSRMLS_CC);
			}
		}
		*/
		zend_u_is_auto_global(aginfo->type, aginfo->key, aginfo->key_len TSRMLS_CC);
	}
#endif
#ifdef E_STRICT
	/* restore trigger errors */
	for (i = 0; i < p->compilererror_cnt; i ++) {
		xc_compilererror_t *error = &p->compilererrors[i];
		CG(zend_lineno) = error->lineno;
		zend_error(error->type, "%s", error->error);
	}
	CG(zend_lineno) = 0;
#endif

	i = 1;
	zend_hash_add(&EG(included_files), xce->name.str.val, xce->name.str.len+1, (void *)&i, sizeof(int), NULL);
	if (h) {
		zend_llist_add_element(&CG(open_files), h);
	}

#ifndef ZEND_ENGINE_2
	my_free_alloca(new_cest_ptrs, use_heap);
#endif
	CG(active_op_array) = old_active_op_array;
	return p->op_array;
}
/* }}} */

static inline void xc_entry_unholds_real(xc_stack_t *holds, xc_cache_t **caches, int cachecount TSRMLS_DC) /* {{{ */
{
	int i;
	xc_stack_t *s;
	xc_cache_t *cache;
	xc_entry_t *xce;

	for (i = 0; i < cachecount; i ++) {
		s = &holds[i];
		TRACE("holded %d", xc_stack_count(s));
		if (xc_stack_count(s)) {
			cache = ((xc_entry_t *)xc_stack_top(s))->cache;
			ENTER_LOCK(cache) {
				while (xc_stack_count(s)) {
					xce = (xc_entry_t*) xc_stack_pop(s);
					TRACE("unhold %s", xce->name.str.val);
					xce->refcount --;
					assert(xce->refcount >= 0);
				}
			} LEAVE_LOCK(cache);
		}
	}
}
/* }}} */
static void xc_entry_unholds(TSRMLS_D) /* {{{ */
{
	if (xc_php_caches) {
		xc_entry_unholds_real(XG(php_holds), xc_php_caches, xc_php_hcache.size TSRMLS_CC);
	}

	if (xc_var_caches) {
		xc_entry_unholds_real(XG(var_holds), xc_var_caches, xc_var_hcache.size TSRMLS_CC);
	}
}
/* }}} */
static int xc_stat(const char *filename, const char *include_path, struct stat *pbuf TSRMLS_DC) /* {{{ */
{
	char filepath[MAXPATHLEN];
	char *paths, *path;
	char *tokbuf;
	int size = strlen(include_path) + 1;
	char tokens[] = { DEFAULT_DIR_SEPARATOR, '\0' };
	int ret;
	ALLOCA_FLAG(use_heap)

	paths = (char *)my_do_alloca(size, use_heap);
	memcpy(paths, include_path, size);

	for (path = php_strtok_r(paths, tokens, &tokbuf); path; path = php_strtok_r(NULL, tokens, &tokbuf)) {