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|
/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) 1998-2016 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);
pefree(str, GC_FLAGS(str) & IS_STR_PERSISTENT);
}
#endif
/* Readonly, so assigned also per thread. */
static const zend_string **known_interned_strings = NULL;
static uint32_t known_interned_strings_count = 0;
ZEND_API uint32_t zend_intern_known_strings(const char **strings, uint32_t count)
{
uint32_t i, old_count = known_interned_strings_count;
known_interned_strings = perealloc(known_interned_strings, sizeof(char*) * (old_count + count), 1);
for (i = 0; i < count; i++) {
#ifndef ZTS
zend_string *str = zend_string_init(strings[i], strlen(strings[i]), 1);
known_interned_strings[known_interned_strings_count + i] =
zend_new_interned_string_int(str);
#else
known_interned_strings[known_interned_strings_count + i] =
zend_zts_interned_string_init(strings[i], strlen(strings[i]));
#endif
}
known_interned_strings_count = old_count + count;
return old_count;
}
static const char *known_strings[] = {
#define _ZEND_STR_DSC(id, str) str,
ZEND_KNOWN_STRINGS(_ZEND_STR_DSC)
#undef _ZEND_STR_DSC
NULL
};
void zend_known_interned_strings_init(zend_string ***strings, uint32_t *count)
{
*strings = known_interned_strings;
*count = known_interned_strings_count;
}
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;
HT_SET_DATA_ADDR(&CG(interned_strings), pemalloc(HT_SIZE(&CG(interned_strings)), 1));
HT_HASH_RESET(&CG(interned_strings));
CG(interned_strings).u.flags |= HASH_FLAG_INITIALIZED;
/* interned empty string */
str = zend_string_alloc(sizeof("")-1, 1);
ZSTR_VAL(str)[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)));
/* known strings */
zend_intern_known_strings(known_strings, (sizeof(known_strings) / sizeof(known_strings[0])) - 1);
zend_known_interned_strings_init(&CG(known_strings), &CG(known_strings_count));
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));
#else
uint32_t i;
for (i = 0; i < CG(known_strings_count); i++) {
zend_zts_interned_string_free(&CG(known_strings)[i]);
}
#endif
free(CG(known_strings));
CG(known_strings) = NULL;
CG(known_strings_count) = 0;
}
static zend_string *zend_new_interned_string_int(zend_string *str)
{
#ifndef ZTS
zend_ulong h;
uint nIndex;
uint idx;
Bucket *p;
if (ZSTR_IS_INTERNED(str)) {
return str;
}
h = zend_string_hash_val(str);
nIndex = h | CG(interned_strings).nTableMask;
idx = HT_HASH(&CG(interned_strings), nIndex);
while (idx != HT_INVALID_IDX) {
p = HT_HASH_TO_BUCKET(&CG(interned_strings), idx);
if ((p->h == h) && (ZSTR_LEN(p->key) == ZSTR_LEN(str))) {
if (!memcmp(ZSTR_VAL(p->key), ZSTR_VAL(str), ZSTR_LEN(str))) {
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 < HT_MAX_SIZE) { /* Let's double the table size */
void *new_data;
void *old_data = HT_GET_DATA_ADDR(&CG(interned_strings));
Bucket *old_buckets = CG(interned_strings).arData;
HANDLE_BLOCK_INTERRUPTIONS();
CG(interned_strings).nTableSize += CG(interned_strings).nTableSize;
CG(interned_strings).nTableMask = -CG(interned_strings).nTableSize;
new_data = malloc(HT_SIZE(&CG(interned_strings)));
if (new_data) {
HT_SET_DATA_ADDR(&CG(interned_strings), new_data);
memcpy(CG(interned_strings).arData, old_buckets, sizeof(Bucket) * CG(interned_strings).nNumUsed);
free(old_data);
zend_hash_rehash(&CG(interned_strings));
} else {
CG(interned_strings).nTableSize = CG(interned_strings).nTableSize >> 1;
CG(interned_strings).nTableMask = -CG(interned_strings).nTableSize;
}
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) = HT_HASH(&CG(interned_strings), nIndex);
HT_HASH(&CG(interned_strings), nIndex) = HT_IDX_TO_HASH(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 (HT_HASH(&CG(interned_strings), nIndex) == HT_IDX_TO_HASH(idx)) {
HT_HASH(&CG(interned_strings), nIndex) = Z_NEXT(p->val);
} else {
uint32_t prev = HT_HASH(&CG(interned_strings), nIndex);
while (Z_NEXT(HT_HASH_TO_BUCKET(&CG(interned_strings), prev)->val) != idx) {
prev = Z_NEXT(HT_HASH_TO_BUCKET(&CG(interned_strings), prev)->val);
}
Z_NEXT(HT_HASH_TO_BUCKET(&CG(interned_strings), prev)->val) = Z_NEXT(p->val);
}
}
#endif
}
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* indent-tabs-mode: t
* End:
*/
|
