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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"
#ifndef ZEND_DEBUG_INTERNED_STRINGS
# define ZEND_DEBUG_INTERNED_STRINGS 0
#endif
#if ZEND_DEBUG_INTERNED_STRINGS
# include <sys/mman.h>
#endif
ZEND_API const char *(*zend_new_interned_string)(const char *str, int len, int free_src TSRMLS_DC);
ZEND_API void (*zend_interned_strings_snapshot)(TSRMLS_D);
ZEND_API void (*zend_interned_strings_restore)(TSRMLS_D);
static const char *zend_new_interned_string_int(const char *str, int len, int free_src TSRMLS_DC);
static void zend_interned_strings_snapshot_int(TSRMLS_D);
static void zend_interned_strings_restore_int(TSRMLS_D);
void zend_interned_strings_init(TSRMLS_D)
{
#ifndef ZTS
size_t size = 1024 * 1024;
#if ZEND_DEBUG_INTERNED_STRINGS
CG(interned_strings_start) = valloc(size);
#else
CG(interned_strings_start) = malloc(size);
#endif
CG(interned_strings_top) = CG(interned_strings_start);
CG(interned_strings_snapshot_top) = CG(interned_strings_start);
CG(interned_strings_end) = CG(interned_strings_start) + size;
zend_hash_init(&CG(interned_strings), 0, NULL, NULL, 1);
CG(interned_strings).nTableMask = CG(interned_strings).nTableSize - 1;
CG(interned_strings).arBuckets = (Bucket **) pecalloc(CG(interned_strings).nTableSize, sizeof(Bucket *), CG(interned_strings).persistent);
#if ZEND_DEBUG_INTERNED_STRINGS
mprotect(CG(interned_strings_start), CG(interned_strings_end) - CG(interned_strings_start), PROT_READ);
#endif
/* interned empty string */
CG(interned_empty_string) = zend_new_interned_string_int("", sizeof(""), 0 TSRMLS_CC);
#endif
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(TSRMLS_D)
{
#ifndef ZTS
#if ZEND_DEBUG_INTERNED_STRINGS
mprotect(CG(interned_strings_start), CG(interned_strings_end) - CG(interned_strings_start), PROT_WRITE | PROT_READ);
#endif
free(CG(interned_strings).arBuckets);
free(CG(interned_strings_start));
#endif
}
static const char *zend_new_interned_string_int(const char *arKey, int nKeyLength, int free_src TSRMLS_DC)
{
#ifndef ZTS
ulong h;
uint nIndex;
Bucket *p;
if (IS_INTERNED(arKey)) {
return arKey;
}
h = zend_inline_hash_func(arKey, nKeyLength);
nIndex = h & CG(interned_strings).nTableMask;
p = CG(interned_strings).arBuckets[nIndex];
while (p != NULL) {
if ((p->h == h) && (p->nKeyLength == nKeyLength)) {
if (!memcmp(p->arKey, arKey, nKeyLength)) {
if (free_src) {
efree((void *)arKey);
}
return p->arKey;
}
}
p = p->pNext;
}
if (CG(interned_strings_top) + ZEND_MM_ALIGNED_SIZE(sizeof(Bucket) + nKeyLength) >=
CG(interned_strings_end)) {
/* no memory */
return arKey;
}
p = (Bucket *) CG(interned_strings_top);
CG(interned_strings_top) += ZEND_MM_ALIGNED_SIZE(sizeof(Bucket) + nKeyLength);
#if ZEND_DEBUG_INTERNED_STRINGS
mprotect(CG(interned_strings_start), CG(interned_strings_end) - CG(interned_strings_start), PROT_READ | PROT_WRITE);
#endif
p->arKey = (char*)(p+1);
memcpy((char*)p->arKey, arKey, nKeyLength);
if (free_src) {
efree((void *)arKey);
}
p->nKeyLength = nKeyLength;
p->h = h;
p->pData = &p->pDataPtr;
p->pDataPtr = p;
p->pNext = CG(interned_strings).arBuckets[nIndex];
p->pLast = NULL;
if (p->pNext) {
p->pNext->pLast = p;
}
HANDLE_BLOCK_INTERRUPTIONS();
p->pListLast = CG(interned_strings).pListTail;
CG(interned_strings).pListTail = p;
p->pListNext = NULL;
if (p->pListLast != NULL) {
p->pListLast->pListNext = p;
}
if (!CG(interned_strings).pListHead) {
CG(interned_strings).pListHead = p;
}
CG(interned_strings).arBuckets[nIndex] = p;
HANDLE_UNBLOCK_INTERRUPTIONS();
CG(interned_strings).nNumOfElements++;
if (CG(interned_strings).nNumOfElements > CG(interned_strings).nTableSize) {
if ((CG(interned_strings).nTableSize << 1) > 0) { /* Let's double the table size */
Bucket **t = (Bucket **) perealloc_recoverable(CG(interned_strings).arBuckets, (CG(interned_strings).nTableSize << 1) * sizeof(Bucket *), CG(interned_strings).persistent);
if (t) {
HANDLE_BLOCK_INTERRUPTIONS();
CG(interned_strings).arBuckets = t;
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();
}
}
}
#if ZEND_DEBUG_INTERNED_STRINGS
mprotect(CG(interned_strings_start), CG(interned_strings_end) - CG(interned_strings_start), PROT_READ);
#endif
return p->arKey;
#else
return arKey;
#endif
}
static void zend_interned_strings_snapshot_int(TSRMLS_D)
{
CG(interned_strings_snapshot_top) = CG(interned_strings_top);
}
static void zend_interned_strings_restore_int(TSRMLS_D)
{
#ifndef ZTS
Bucket *p;
int i;
#endif
CG(interned_strings_top) = CG(interned_strings_snapshot_top);
#ifndef ZTS
#if ZEND_DEBUG_INTERNED_STRINGS
mprotect(CG(interned_strings_start), CG(interned_strings_end) - CG(interned_strings_start), PROT_WRITE | PROT_READ);
#endif
for (i = 0; i < CG(interned_strings).nTableSize; i++) {
p = CG(interned_strings).arBuckets[i];
while (p && p->arKey > CG(interned_strings_top)) {
CG(interned_strings).nNumOfElements--;
if (p->pListLast != NULL) {
p->pListLast->pListNext = p->pListNext;
} else {
CG(interned_strings).pListHead = p->pListNext;
}
if (p->pListNext != NULL) {
p->pListNext->pListLast = p->pListLast;
} else {
CG(interned_strings).pListTail = p->pListLast;
}
p = p->pNext;
}
if (p) {
p->pLast = NULL;
}
CG(interned_strings).arBuckets[i] = p;
}
#if ZEND_DEBUG_INTERNED_STRINGS
mprotect(CG(interned_strings_start), CG(interned_strings_end) - CG(interned_strings_start), PROT_READ);
#endif
#endif
}
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* indent-tabs-mode: t
* End:
*/
|
