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|
/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) 1998-2014 Zend Technologies Ltd. (http://www.zend.com) |
+----------------------------------------------------------------------+
| This source file is subject to version 2.00 of the Zend license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.zend.com/license/2_00.txt. |
| If you did not receive a copy of the Zend license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@zend.com so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Dmitry Stogov <dmitry@zend.com> |
+----------------------------------------------------------------------+
*/
/* $Id: $ */
#include "zend.h"
#include "zend_globals.h"
ZEND_API zend_string *(*zend_new_interned_string)(zend_string *str);
ZEND_API void (*zend_interned_strings_snapshot)(void);
ZEND_API void (*zend_interned_strings_restore)(void);
static zend_string *zend_new_interned_string_int(zend_string *str);
static void zend_interned_strings_snapshot_int(void);
static void zend_interned_strings_restore_int(void);
ZEND_API zend_ulong zend_hash_func(const char *str, size_t len)
{
return zend_inline_hash_func(str, len);
}
#ifndef ZTS
static void _str_dtor(zval *zv)
{
zend_string *str = Z_STR_P(zv);
GC_FLAGS(str) &= ~IS_STR_INTERNED;
GC_REFCOUNT(str) = 1;
}
#endif
void zend_interned_strings_init(void)
{
#ifndef ZTS
zend_string *str;
zend_hash_init(&CG(interned_strings), 1024, NULL, _str_dtor, 1);
CG(interned_strings).nTableMask = CG(interned_strings).nTableSize - 1;
CG(interned_strings).arData = (Bucket*) pecalloc(CG(interned_strings).nTableSize, sizeof(Bucket), 1);
CG(interned_strings).arHash = (uint32_t*) pecalloc(CG(interned_strings).nTableSize, sizeof(uint32_t), 1);
memset(CG(interned_strings).arHash, INVALID_IDX, CG(interned_strings).nTableSize * sizeof(uint32_t));
/* interned empty string */
str = zend_string_alloc(sizeof("")-1, 1);
str->val[0] = '\000';
CG(empty_string) = zend_new_interned_string_int(str);
#endif
/* one char strings (the actual interned strings are going to be created by ext/opcache) */
memset(CG(one_char_string), 0, sizeof(CG(one_char_string)));
zend_new_interned_string = zend_new_interned_string_int;
zend_interned_strings_snapshot = zend_interned_strings_snapshot_int;
zend_interned_strings_restore = zend_interned_strings_restore_int;
}
void zend_interned_strings_dtor(void)
{
#ifndef ZTS
zend_hash_destroy(&CG(interned_strings));
#endif
}
static zend_string *zend_new_interned_string_int(zend_string *str)
{
#ifndef ZTS
zend_ulong h;
uint nIndex;
uint idx;
Bucket *p;
if (IS_INTERNED(str)) {
return str;
}
h = zend_string_hash_val(str);
nIndex = h & CG(interned_strings).nTableMask;
idx = CG(interned_strings).arHash[nIndex];
while (idx != INVALID_IDX) {
p = CG(interned_strings).arData + idx;
if ((p->h == h) && (p->key->len == str->len)) {
if (!memcmp(p->key->val, str->val, str->len)) {
zend_string_release(str);
return p->key;
}
}
idx = Z_NEXT(p->val);
}
GC_REFCOUNT(str) = 1;
GC_FLAGS(str) |= IS_STR_INTERNED;
if (CG(interned_strings).nNumUsed >= CG(interned_strings).nTableSize) {
if ((CG(interned_strings).nTableSize << 1) > 0) { /* Let's double the table size */
Bucket *d = (Bucket *) perealloc_recoverable(CG(interned_strings).arData, (CG(interned_strings).nTableSize << 1) * sizeof(Bucket), 1);
uint32_t *h = (uint32_t *) perealloc_recoverable(CG(interned_strings).arHash, (CG(interned_strings).nTableSize << 1) * sizeof(uint32_t), 1);
if (d && h) {
HANDLE_BLOCK_INTERRUPTIONS();
CG(interned_strings).arData = d;
CG(interned_strings).arHash = h;
CG(interned_strings).nTableSize = (CG(interned_strings).nTableSize << 1);
CG(interned_strings).nTableMask = CG(interned_strings).nTableSize - 1;
zend_hash_rehash(&CG(interned_strings));
HANDLE_UNBLOCK_INTERRUPTIONS();
}
}
}
HANDLE_BLOCK_INTERRUPTIONS();
idx = CG(interned_strings).nNumUsed++;
CG(interned_strings).nNumOfElements++;
p = CG(interned_strings).arData + idx;
p->h = h;
p->key = str;
Z_STR(p->val) = str;
Z_TYPE_INFO(p->val) = IS_INTERNED_STRING_EX;
nIndex = h & CG(interned_strings).nTableMask;
Z_NEXT(p->val) = CG(interned_strings).arHash[nIndex];
CG(interned_strings).arHash[nIndex] = idx;
HANDLE_UNBLOCK_INTERRUPTIONS();
return str;
#else
return str;
#endif
}
static void zend_interned_strings_snapshot_int(void)
{
#ifndef ZTS
uint idx;
Bucket *p;
idx = CG(interned_strings).nNumUsed;
while (idx > 0) {
idx--;
p = CG(interned_strings).arData + idx;
ZEND_ASSERT(GC_FLAGS(p->key) & IS_STR_PERSISTENT);
GC_FLAGS(p->key) |= IS_STR_PERMANENT;
}
#endif
}
static void zend_interned_strings_restore_int(void)
{
#ifndef ZTS
uint nIndex;
uint idx;
Bucket *p;
idx = CG(interned_strings).nNumUsed;
while (idx > 0) {
idx--;
p = CG(interned_strings).arData + idx;
if (GC_FLAGS(p->key) & IS_STR_PERMANENT) break;
CG(interned_strings).nNumUsed--;
CG(interned_strings).nNumOfElements--;
GC_FLAGS(p->key) &= ~IS_STR_INTERNED;
GC_REFCOUNT(p->key) = 1;
zend_string_free(p->key);
nIndex = p->h & CG(interned_strings).nTableMask;
if (CG(interned_strings).arHash[nIndex] == idx) {
CG(interned_strings).arHash[nIndex] = Z_NEXT(p->val);
} else {
uint prev = CG(interned_strings).arHash[nIndex];
while (Z_NEXT(CG(interned_strings).arData[prev].val) != idx) {
prev = Z_NEXT(CG(interned_strings).arData[prev].val);
}
Z_NEXT(CG(interned_strings).arData[prev].val) = Z_NEXT(p->val);
}
}
#endif
}
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* indent-tabs-mode: t
* End:
*/
|
