xcache/xcache.c

#undef DEBUG

/* {{{ 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 "zend_extensions.h"
#include "SAPI.h"

#include "xcache.h"
#include "optimizer.h"
#include "coverager.h"
#include "disassembler.h"
#include "align.h"
#include "stack.h"
#include "xcache_globals.h"
#include "processor.h"
#include "utils.h"
#include "const_string.h"
#include "opcode_spec.h"

#ifdef DEBUG
#	undef NDEBUG
#	undef inline
#	define inline
#else
#	ifndef NDEBUG
#		define NDEBUG
#	endif
#endif
#include <assert.h>

#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 zend_compile_file_t *origin_compile_file;

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

static zend_bool xc_module_gotup = 0;
static zend_bool xc_zend_extension_gotup = 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 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 {
				xc_entry_data_php_t *ap = a->data.php;
				xc_entry_data_php_t *bp = b->data.php;
				return ap->inode == bp->inode
					&& ap->device == bp->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_free_real_dmz(volatile xc_entry_t *xce) /* {{{ */
{
	xce->cache->mem->handlers->free(xce->cache->mem, (xc_entry_t *)xce);
}
/* }}} */
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_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->data.php->mtime == xce->data.php->mtime) {
				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) /* {{{ */
{
#ifdef DEBUG
	fprintf(stderr, "hold %s\n", ZSTR_S(xce->name));
#endif
	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

/* 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) /* {{{ */
{
#ifdef DEBUG
	fprintf(stderr, "ttl %d, %d %d\n", XG(request_time), entry->atime, xc_php_ttl);
#endif
	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) /* {{{ */
{
#ifdef DEBUG
	fprintf(stderr, "interval %d, %d %d\n", XG(request_time), cache->last_gc_expires, gc_interval);
#endif
	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) {
		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) {
		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;

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

	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;
	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 = (cachetype == XC_TYPE_PHP) ? xc_php_gc_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("cached"),    cache->entries_count);
	add_assoc_long_ex(return_value, ZEND_STRS("deleted"),   cache->deletes_count);
	if (interval) {
		add_assoc_long_ex(return_value, ZEND_STRS("gc"),    (cache->last_gc_expires + interval) - XG(request_time));
	}
	else {
		add_assoc_null_ex(return_value, ZEND_STRS("gc"));
	}

	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);
	assert(avail == handlers->avail(mem));
}
/* }}} */
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("size"),     entry->size);
	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);
	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("sourcesize"),    php->sourcesize);
#ifdef HAVE_INODE
			add_assoc_long_ex(ei, ZEND_STRS("device"),        php->device);
			add_assoc_long_ex(ei, ZEND_STRS("inode"),         php->inode);
#endif
			add_assoc_long_ex(ei, ZEND_STRS("mtime"),         php->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);
			break;
		case XC_TYPE_VAR:
			var = entry->data.var;
			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;
#ifndef ZEND_ENGINE_2
	/* new ptr which is stored inside CG(class_table) */
	xc_cest_t **new_cest_ptrs = (xc_cest_t **)do_alloca(sizeof(xc_cest_t*) * p->classinfo_cnt);
#endif

#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 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 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) ce->parent) - 1;
			assert(class_idx < i);
			ci->cest.parent = new_cest_ptrs[class_idx];
		}
		new_cest_ptrs[i] =
#endif
		xc_install_class(xce->name.str.val, &ci->cest,
				UNISW(0, ci->type), ci->key, ci->key_size TSRMLS_CC);
	}

	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
	free_alloca(new_cest_ptrs);
#endif
	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];
#ifdef DEBUG
		fprintf(stderr, "holded %d\n", xc_stack_size(s));
#endif
		if (xc_stack_size(s)) {
			cache = ((xc_entry_t *)xc_stack_top(s))->cache;
			ENTER_LOCK(cache) {
				while (xc_stack_size(s)) {
					xce = (xc_entry_t*) xc_stack_pop(s);
#ifdef DEBUG
					fprintf(stderr, "unhold %s\n", ZSTR_S(xce->name));
#endif
					xce->refcount --;
					assert(xce->refcount >= 0);
				}
			} LEAVE_LOCK(cache);
		}
	}
}
/* }}} */
static void xc_entry_unholds(TSRMLS_D) /* {{{ */
{
	xc_entry_unholds_real(XG(php_holds), xc_php_caches, xc_php_hcache.size TSRMLS_CC);
	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[1024];
	char *paths, *path;
	char *tokbuf;
	int size = strlen(include_path) + 1;
	char tokens[] = { DEFAULT_DIR_SEPARATOR, '\0' };

	paths = (char *)do_alloca(size);
	memcpy(paths, include_path, size);

	for (path = php_strtok_r(paths, tokens, &tokbuf); path; path = php_strtok_r(NULL, tokens, &tokbuf)) {
		if (strlen(path) + strlen(filename) + 1 > 1024) {
			continue;
		}
		snprintf(filepath, sizeof(filepath), "%s/%s", path, filename);
		if (VCWD_STAT(filepath, pbuf) == 0) {
			free_alloca(paths);
			return 0;
		}
	}

	free_alloca(paths);

	return 1;
}
/* }}} */

#define HASH(i) (i)
#define HASH_USTR_L(t, s, l) HASH(zend_u_inline_hash_func(t, s, (l + 1) * sizeof(UChar)))
#define HASH_STR_L(s, l) HASH(zend_inline_hash_func(s, l + 1))
#define HASH_STR(s) HASH_STR_L(s, strlen(s) + 1)
#define HASH_NUM(n) HASH(n)
static inline xc_hash_value_t xc_entry_hash_var(xc_entry_t *xce TSRMLS_DC) /* {{{ */
{
	return UNISW(NOTHING, UG(unicode) ? HASH_USTR_L(xce->name_type, xce->name.uni.val, xce->name.uni.len) :)
		HASH_STR_L(xce->name.str.val, xce->name.str.len);
}
/* }}} */
static inline xc_hash_value_t xc_entry_hash_php(xc_entry_t *xce TSRMLS_DC) /* {{{ */
{
#ifdef HAVE_INODE
	return HASH(xce->data.php->device + xce->data.php->inode);
#else
	return xc_entry_hash_var(xce TSRMLS_CC);
#endif
}
/* }}} */
static int xc_entry_init_key_php(xc_entry_t *xce, char *filename TSRMLS_DC) /* {{{ */
{
	struct stat buf, *pbuf;
	xc_hash_value_t hv;
	int cacheid;
	xc_entry_data_php_t *php;
	char *ptr;

	if (!filename || !SG(request_info).path_translated) {
		return 0;
	}

	do {
		if (strcmp(SG(request_info).path_translated, filename) == 0) {
			/* sapi has already done this stat() for us */
			pbuf = sapi_get_stat(TSRMLS_C);
			if (pbuf) {
				break;
			}
		}

		/* absolute path */
		pbuf = &buf;
		if (IS_ABSOLUTE_PATH(filename, strlen(filename))) {
			if (VCWD_STAT(filename, pbuf) != 0) {
				return 0;
			}
			break;
		}

		/* relative path */
		if (*filename == '.' && (IS_SLASH(filename[1]) || filename[1] == '.')) {
			ptr = filename + 1;
			if (*ptr == '.') {
				while (*(++ptr) == '.');
				if (!IS_SLASH(*ptr)) {
					goto not_relative_path;
				}   
			}

			if (VCWD_STAT(filename, pbuf) != 0) {
				return 0;
			}
			break;
		}
not_relative_path:

		/* use include_path */
		if (xc_stat(filename, PG(include_path), pbuf TSRMLS_CC) != 0) {   
			return 0;
		}
	} while (0);

	if (XG(request_time) - pbuf->st_mtime < 2) {
		return 0;
	}

	UNISW(NOTHING, xce->name_type = IS_STRING;)
	xce->name.str.val = filename;
	xce->name.str.len = strlen(filename);

	php = xce->data.php;
	php->mtime        = pbuf->st_mtime;
#ifdef HAVE_INODE
	php->device       = pbuf->st_dev;
	php->inode        = pbuf->st_ino;
#endif
	php->sourcesize   = pbuf->st_size;


	hv = xc_entry_hash_php(xce TSRMLS_CC);
	cacheid = (hv & xc_php_hcache.mask);
	xce->cache = xc_php_caches[cacheid];
	hv >>= xc_php_hcache.bits;
	xce->hvalue = (hv & xc_php_hentry.mask);

	xce->type = XC_TYPE_PHP;
	return 1;
}
/* }}} */
static zend_op_array *xc_compile_file(zend_file_handle *h, int type TSRMLS_DC) /* {{{ */
{
	xc_sandbox_t sandbox;
	zend_op_array *op_array;
	xc_entry_t xce, *stored_xce;
	xc_entry_data_php_t php;
	xc_cache_t *cache;
	zend_bool clogged = 0;
	zend_bool catched = 0;
	char *filename;
	int old_constinfo_cnt, old_funcinfo_cnt, old_classinfo_cnt;

	if (!xc_initized) {
		assert(0);
	}

	if (!XG(cacher)) {
		op_array = origin_compile_file(h, type TSRMLS_CC);
#ifdef HAVE_XCACHE_OPTIMIZER
		if (XG(optimizer)) {
			xc_optimize(op_array TSRMLS_CC);
		}
#endif
		return op_array;
	}

	/* {{{ prepare key
	 * include_once() and require_once() gives us opened_path
	 * however, include() and require() non-absolute path which break
	 * included_files, and may confuse with (include|require)_once
	 * -- Xuefer
	 */

	filename = h->opened_path ? h->opened_path : h->filename;
	xce.data.php = &php;
	if (!xc_entry_init_key_php(&xce, filename TSRMLS_CC)) {
		return origin_compile_file(h, type TSRMLS_CC);
	}
	cache = xce.cache;
	/* }}} */
	/* {{{ restore */
	/* stale precheck */
	if (cache->compiling) {
		cache->clogs ++; /* is it safe here? */
		return origin_compile_file(h, type TSRMLS_CC);
	}

	stored_xce = NULL;
	op_array = NULL;
	ENTER_LOCK_EX(cache) {
		/* clogged */
		if (cache->compiling) {
			cache->clogs ++;
			op_array = NULL;
			clogged = 1;
			break;
		}

		stored_xce = xc_entry_find_dmz(&xce TSRMLS_CC);
		/* found */
		if (stored_xce) {
#ifdef DEBUG
			fprintf(stderr, "found %s, catch it\n", stored_xce->name.str.val);
#endif
			xc_entry_hold_php_dmz(stored_xce TSRMLS_CC);
			cache->hits ++;
			break;
		}

		cache->compiling = XG(request_time);
		cache->misses ++;
	} LEAVE_LOCK_EX(cache);

	if (catched) {
		cache->compiling = 0;
		zend_bailout();
	}

	/* found */
	if (stored_xce) {
		goto restore;
	}

	/* clogged */
	if (clogged) {
		return origin_compile_file(h, type TSRMLS_CC);
	}
	/* }}} */

	/* {{{ compile */
#ifdef DEBUG
	fprintf(stderr, "compiling %s\n", filename);
#endif

	/* make compile inside sandbox */
	xc_sandbox_init(&sandbox, filename TSRMLS_CC);

	old_classinfo_cnt = zend_hash_num_elements(CG(class_table));
	old_funcinfo_cnt  = zend_hash_num_elements(CG(function_table));
	old_constinfo_cnt  = zend_hash_num_elements(EG(zend_constants));

	zend_try {
		op_array = origin_compile_file(h, type TSRMLS_CC);
	} zend_catch {
		catched = 1;
	} zend_end_try();

	if (catched) {
		goto err_bailout;
	}

	if (op_array == NULL) {
		goto err_oparray;
	}

	filename = h->opened_path ? h->opened_path : h->filename;
	if (xce.name.str.val != filename) {
		xce.name.str.val = filename;
		xce.name.str.len = strlen(filename);
	}

#ifdef HAVE_XCACHE_OPTIMIZER
	if (XG(optimizer)) {
		xc_optimize(op_array TSRMLS_CC);
	}
#endif

	php.op_array      = op_array;

#ifdef HAVE_XCACHE_CONSTANT
	php.constinfo_cnt = zend_hash_num_elements(EG(zend_constants)) - old_constinfo_cnt;
#endif
	php.funcinfo_cnt  = zend_hash_num_elements(CG(function_table)) - old_funcinfo_cnt;
	php.classinfo_cnt = zend_hash_num_elements(CG(class_table))    - old_classinfo_cnt;

#define X_ALLOC_N(var, cnt) do {     \
	if (php.cnt) {                   \
		ECALLOC_N(php.var, php.cnt); \
		if (!php.var) {              \
			goto err_##var;          \
		}                            \
	}                                \
	else {                           \
		php.var = NULL;              \
	}                                \
} while (0)

#ifdef HAVE_XCACHE_CONSTANT
	X_ALLOC_N(constinfos, constinfo_cnt);
#endif
	X_ALLOC_N(funcinfos,  funcinfo_cnt);
	X_ALLOC_N(classinfos, classinfo_cnt);
#undef X_ALLOC
	/* }}} */
	/* {{{ shallow copy, pointers only */ {
		Bucket *b;
		unsigned int i;

#define COPY_H(vartype, var, cnt, name, datatype) do {        \
	for (i = 0; b; i ++, b = b->pListNext) {                  \
		vartype *data = &php.var[i];                          \
                                                              \
		if (i < old_##cnt) {                                  \
			continue;                                         \
		}                                                     \
                                                              \
		assert(i < old_##cnt + php.cnt);                      \
		assert(b->pData);                                     \
		memcpy(&data->name, b->pData, sizeof(datatype));      \
		UNISW(NOTHING, data->type = b->key.type;)             \
		if (UNISW(1, b->key.type == IS_STRING)) {             \
			ZSTR_S(data->key)      = BUCKET_KEY(b);           \
		}                                                     \
		else {                                                \
			ZSTR_U(data->key)      = BUCKET_UKEY(b);          \
		}                                                     \
		data->key_size   = b->nKeyLength;                     \
	}                                                         \
} while(0)

#ifdef HAVE_XCACHE_CONSTANT
		b = EG(zend_constants)->pListHead; COPY_H(xc_constinfo_t, constinfos, constinfo_cnt, constant, zend_constant);
#endif
		b = CG(function_table)->pListHead; COPY_H(xc_funcinfo_t,  funcinfos,  funcinfo_cnt,  func,     zend_function);
		b = CG(class_table)->pListHead;    COPY_H(xc_classinfo_t, classinfos, classinfo_cnt, cest,     xc_cest_t);