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235 lines
6.7 KiB
C
235 lines
6.7 KiB
C
/*
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+----------------------------------------------------------------------+
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| Zend Engine |
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+----------------------------------------------------------------------+
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| Copyright (c) 1998-2018 Zend Technologies Ltd. (http://www.zend.com) |
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+----------------------------------------------------------------------+
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| This source file is subject to version 2.00 of the Zend license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| http://www.zend.com/license/2_00.txt. |
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| If you did not receive a copy of the Zend license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@zend.com so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Authors: Dmitry Stogov <dmitry@zend.com> |
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+----------------------------------------------------------------------+
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*/
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/* $Id: $ */
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#include "zend.h"
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#include "zend_globals.h"
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ZEND_API zend_string *(*zend_new_interned_string)(zend_string *str);
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static zend_string *zend_new_interned_string_permanent(zend_string *str);
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static zend_string *zend_new_interned_string_request(zend_string *str);
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/* Any strings interned in the startup phase. Common to all the threads,
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won't be free'd until process exit. If we want an ability to
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add permanent strings even after startup, it would be still
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possible on costs of locking in the thread safe builds. */
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static HashTable interned_strings_permanent;
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static zend_new_interned_string_func_t interned_string_request_handler = zend_new_interned_string_request;
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static zend_string_copy_storage_func_t interned_string_copy_storage = NULL;
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ZEND_API zend_string *zend_empty_string = NULL;
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ZEND_API zend_string *zend_one_char_string[256];
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ZEND_API zend_string **zend_known_strings = NULL;
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ZEND_API zend_ulong zend_hash_func(const char *str, size_t len)
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{
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return zend_inline_hash_func(str, len);
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}
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static void _str_dtor(zval *zv)
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{
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zend_string *str = Z_STR_P(zv);
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pefree(str, GC_FLAGS(str) & IS_STR_PERSISTENT);
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}
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static const char *known_strings[] = {
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#define _ZEND_STR_DSC(id, str) str,
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ZEND_KNOWN_STRINGS(_ZEND_STR_DSC)
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#undef _ZEND_STR_DSC
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NULL
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};
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static void zend_init_interned_strings_ht(HashTable *interned_strings, int permanent)
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{
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zend_hash_init(interned_strings, 1024, NULL, _str_dtor, permanent);
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zend_hash_real_init(interned_strings, 0);
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}
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ZEND_API void zend_interned_strings_init(void)
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{
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char s[2];
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int i;
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zend_string *str;
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interned_string_request_handler = zend_new_interned_string_request;
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interned_string_copy_storage = NULL;
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zend_empty_string = NULL;
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zend_known_strings = NULL;
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zend_init_interned_strings_ht(&interned_strings_permanent, 1);
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zend_new_interned_string = zend_new_interned_string_permanent;
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/* interned empty string */
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str = zend_string_alloc(sizeof("")-1, 1);
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ZSTR_VAL(str)[0] = '\000';
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zend_empty_string = zend_new_interned_string_permanent(str);
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s[1] = 0;
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for (i = 0; i < 256; i++) {
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s[0] = i;
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zend_one_char_string[i] = zend_new_interned_string_permanent(zend_string_init(s, 1, 1));
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}
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/* known strings */
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zend_known_strings = pemalloc(sizeof(zend_string*) * ((sizeof(known_strings) / sizeof(known_strings[0]) - 1)), 1);
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for (i = 0; i < (sizeof(known_strings) / sizeof(known_strings[0])) - 1; i++) {
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str = zend_string_init(known_strings[i], strlen(known_strings[i]), 1);
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zend_known_strings[i] = zend_new_interned_string_permanent(str);
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}
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}
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ZEND_API void zend_interned_strings_dtor(void)
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{
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zend_hash_destroy(&interned_strings_permanent);
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free(zend_known_strings);
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zend_known_strings = NULL;
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}
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static zend_always_inline zend_string *zend_interned_string_ht_lookup(zend_string *str, HashTable *interned_strings)
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{
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zend_ulong h;
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uint32_t nIndex;
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uint32_t idx;
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Bucket *p;
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h = zend_string_hash_val(str);
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nIndex = h | interned_strings->nTableMask;
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idx = HT_HASH(interned_strings, nIndex);
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while (idx != HT_INVALID_IDX) {
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p = HT_HASH_TO_BUCKET(interned_strings, idx);
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if ((p->h == h) && (ZSTR_LEN(p->key) == ZSTR_LEN(str))) {
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if (!memcmp(ZSTR_VAL(p->key), ZSTR_VAL(str), ZSTR_LEN(str))) {
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return p->key;
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}
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}
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idx = Z_NEXT(p->val);
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}
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return NULL;
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}
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/* This function might be not thread safe at least because it would update the
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hash val in the passed string. Be sure it is called in the appropriate context. */
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static zend_always_inline zend_string *zend_add_interned_string(zend_string *str, HashTable *interned_strings, uint32_t flags)
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{
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zval val;
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GC_REFCOUNT(str) = 1;
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GC_FLAGS(str) |= IS_STR_INTERNED | flags;
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ZVAL_INTERNED_STR(&val, str);
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zend_hash_add_new(interned_strings, str, &val);
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return str;
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}
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ZEND_API zend_string *zend_interned_string_find_permanent(zend_string *str)
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{
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return zend_interned_string_ht_lookup(str, &interned_strings_permanent);
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}
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static zend_string *zend_new_interned_string_permanent(zend_string *str)
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{
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zend_string *ret;
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if (ZSTR_IS_INTERNED(str)) {
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return str;
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}
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ret = zend_interned_string_ht_lookup(str, &interned_strings_permanent);
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if (ret) {
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zend_string_release(str);
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return ret;
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}
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return zend_add_interned_string(str, &interned_strings_permanent, IS_STR_PERMANENT);
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}
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static zend_string *zend_new_interned_string_request(zend_string *str)
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{
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zend_string *ret;
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if (ZSTR_IS_INTERNED(str)) {
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return str;
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}
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/* Check for permanent strings, the table is readonly at this point. */
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ret = zend_interned_string_ht_lookup(str, &interned_strings_permanent);
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if (ret) {
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zend_string_release(str);
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return ret;
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}
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ret = zend_interned_string_ht_lookup(str, &CG(interned_strings));
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if (ret) {
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zend_string_release(str);
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return ret;
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}
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/* Create a short living interned, freed after the request. */
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ret = zend_add_interned_string(str, &CG(interned_strings), 0);
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return ret;
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}
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ZEND_API void zend_interned_strings_activate(void)
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{
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zend_init_interned_strings_ht(&CG(interned_strings), 0);
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}
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ZEND_API void zend_interned_strings_deactivate(void)
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{
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zend_hash_destroy(&CG(interned_strings));
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}
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ZEND_API void zend_interned_strings_set_request_storage_handler(zend_new_interned_string_func_t handler)
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{
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interned_string_request_handler = handler;
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}
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ZEND_API void zend_interned_strings_set_permanent_storage_copy_handler(zend_string_copy_storage_func_t handler)
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{
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interned_string_copy_storage = handler;
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}
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ZEND_API void zend_interned_strings_switch_storage(void)
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{
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if (interned_string_copy_storage) {
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interned_string_copy_storage();
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}
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zend_new_interned_string = interned_string_request_handler;
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}
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/*
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* Local variables:
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* tab-width: 4
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* c-basic-offset: 4
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* indent-tabs-mode: t
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* End:
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* vim600: sw=4 ts=4 fdm=marker
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* vim<600: sw=4 ts=4
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*/
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