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234 lines
6.8 KiB
C
234 lines
6.8 KiB
C
/*
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+----------------------------------------------------------------------+
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| Zend Engine |
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+----------------------------------------------------------------------+
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| Copyright (c) 1998-2012 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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#ifndef ZEND_DEBUG_INTERNED_STRINGS
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# define ZEND_DEBUG_INTERNED_STRINGS 0
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#endif
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#if ZEND_DEBUG_INTERNED_STRINGS
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# include <sys/mman.h>
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#endif
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ZEND_API const char *(*zend_new_interned_string)(const char *str, int len, int free_src TSRMLS_DC);
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ZEND_API void (*zend_interned_strings_snapshot)(TSRMLS_D);
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ZEND_API void (*zend_interned_strings_restore)(TSRMLS_D);
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static const char *zend_new_interned_string_int(const char *str, int len, int free_src TSRMLS_DC);
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static void zend_interned_strings_snapshot_int(TSRMLS_D);
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static void zend_interned_strings_restore_int(TSRMLS_D);
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void zend_interned_strings_init(TSRMLS_D)
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{
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#ifndef ZTS
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size_t size = 1024 * 1024;
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#if ZEND_DEBUG_INTERNED_STRINGS
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CG(interned_strings_start) = valloc(size);
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#else
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CG(interned_strings_start) = malloc(size);
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#endif
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CG(interned_strings_top) = CG(interned_strings_start);
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CG(interned_strings_snapshot_top) = CG(interned_strings_start);
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CG(interned_strings_end) = CG(interned_strings_start) + size;
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zend_hash_init(&CG(interned_strings), 0, NULL, NULL, 1);
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CG(interned_strings).nTableMask = CG(interned_strings).nTableSize - 1;
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CG(interned_strings).arBuckets = (Bucket **) pecalloc(CG(interned_strings).nTableSize, sizeof(Bucket *), CG(interned_strings).persistent);
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#if ZEND_DEBUG_INTERNED_STRINGS
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mprotect(CG(interned_strings_start), CG(interned_strings_end) - CG(interned_strings_start), PROT_READ);
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#endif
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#endif
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zend_new_interned_string = zend_new_interned_string_int;
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zend_interned_strings_snapshot = zend_interned_strings_snapshot_int;
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zend_interned_strings_restore = zend_interned_strings_restore_int;
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}
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void zend_interned_strings_dtor(TSRMLS_D)
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{
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#ifndef ZTS
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#if ZEND_DEBUG_INTERNED_STRINGS
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mprotect(CG(interned_strings_start), CG(interned_strings_end) - CG(interned_strings_start), PROT_WRITE | PROT_READ);
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#endif
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free(CG(interned_strings).arBuckets);
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free(CG(interned_strings_start));
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#endif
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}
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static const char *zend_new_interned_string_int(const char *arKey, int nKeyLength, int free_src TSRMLS_DC)
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{
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#ifndef ZTS
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ulong h;
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uint nIndex;
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Bucket *p;
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if (IS_INTERNED(arKey)) {
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return arKey;
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}
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h = zend_inline_hash_func(arKey, nKeyLength);
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nIndex = h & CG(interned_strings).nTableMask;
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p = CG(interned_strings).arBuckets[nIndex];
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while (p != NULL) {
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if ((p->h == h) && (p->nKeyLength == nKeyLength)) {
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if (!memcmp(p->arKey, arKey, nKeyLength)) {
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if (free_src) {
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efree((void *)arKey);
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}
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return p->arKey;
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}
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}
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p = p->pNext;
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}
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if (CG(interned_strings_top) + ZEND_MM_ALIGNED_SIZE(sizeof(Bucket) + nKeyLength) >=
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CG(interned_strings_end)) {
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/* no memory */
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return arKey;
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}
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p = (Bucket *) CG(interned_strings_top);
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CG(interned_strings_top) += ZEND_MM_ALIGNED_SIZE(sizeof(Bucket) + nKeyLength);
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#if ZEND_DEBUG_INTERNED_STRINGS
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mprotect(CG(interned_strings_start), CG(interned_strings_end) - CG(interned_strings_start), PROT_READ | PROT_WRITE);
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#endif
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p->arKey = (char*)(p+1);
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memcpy((char*)p->arKey, arKey, nKeyLength);
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if (free_src) {
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efree((void *)arKey);
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}
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p->nKeyLength = nKeyLength;
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p->h = h;
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p->pData = &p->pDataPtr;
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p->pDataPtr = p;
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p->pNext = CG(interned_strings).arBuckets[nIndex];
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p->pLast = NULL;
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if (p->pNext) {
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p->pNext->pLast = p;
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}
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HANDLE_BLOCK_INTERRUPTIONS();
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p->pListLast = CG(interned_strings).pListTail;
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CG(interned_strings).pListTail = p;
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p->pListNext = NULL;
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if (p->pListLast != NULL) {
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p->pListLast->pListNext = p;
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}
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if (!CG(interned_strings).pListHead) {
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CG(interned_strings).pListHead = p;
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}
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CG(interned_strings).arBuckets[nIndex] = p;
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HANDLE_UNBLOCK_INTERRUPTIONS();
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CG(interned_strings).nNumOfElements++;
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if (CG(interned_strings).nNumOfElements > CG(interned_strings).nTableSize) {
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if ((CG(interned_strings).nTableSize << 1) > 0) { /* Let's double the table size */
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Bucket **t = (Bucket **) perealloc_recoverable(CG(interned_strings).arBuckets, (CG(interned_strings).nTableSize << 1) * sizeof(Bucket *), CG(interned_strings).persistent);
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if (t) {
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HANDLE_BLOCK_INTERRUPTIONS();
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CG(interned_strings).arBuckets = t;
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CG(interned_strings).nTableSize = (CG(interned_strings).nTableSize << 1);
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CG(interned_strings).nTableMask = CG(interned_strings).nTableSize - 1;
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zend_hash_rehash(&CG(interned_strings));
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HANDLE_UNBLOCK_INTERRUPTIONS();
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}
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}
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}
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#if ZEND_DEBUG_INTERNED_STRINGS
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mprotect(CG(interned_strings_start), CG(interned_strings_end) - CG(interned_strings_start), PROT_READ);
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#endif
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return p->arKey;
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#else
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return arKey;
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#endif
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}
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static void zend_interned_strings_snapshot_int(TSRMLS_D)
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{
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CG(interned_strings_snapshot_top) = CG(interned_strings_top);
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}
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static void zend_interned_strings_restore_int(TSRMLS_D)
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{
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#ifndef ZTS
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Bucket *p;
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int i;
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#endif
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CG(interned_strings_top) = CG(interned_strings_snapshot_top);
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#ifndef ZTS
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#if ZEND_DEBUG_INTERNED_STRINGS
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mprotect(CG(interned_strings_start), CG(interned_strings_end) - CG(interned_strings_start), PROT_WRITE | PROT_READ);
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#endif
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for (i = 0; i < CG(interned_strings).nTableSize; i++) {
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p = CG(interned_strings).arBuckets[i];
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while (p && p->arKey > CG(interned_strings_top)) {
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CG(interned_strings).nNumOfElements--;
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if (p->pListLast != NULL) {
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p->pListLast->pListNext = p->pListNext;
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} else {
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CG(interned_strings).pListHead = p->pListNext;
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}
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if (p->pListNext != NULL) {
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p->pListNext->pListLast = p->pListLast;
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} else {
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CG(interned_strings).pListTail = p->pListLast;
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}
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p = p->pNext;
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}
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if (p) {
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p->pLast = NULL;
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}
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CG(interned_strings).arBuckets[i] = p;
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}
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#if ZEND_DEBUG_INTERNED_STRINGS
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mprotect(CG(interned_strings_start), CG(interned_strings_end) - CG(interned_strings_start), PROT_READ);
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#endif
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#endif
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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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*/
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