mirror of
https://github.com/php/php-src.git
synced 2025-08-15 21:48:51 +02:00
c3f0797385
* Implement iteration cache, item cache and length cache for node list iteration The current implementation follows the spec requirement that the list must be "live". This means that changes in the document must be reflected in the existing node lists without requiring the user to refetch the node list. The consequence is that getting any item, or the length of the list, always starts searching from the root element of the node list. This results in O(n) time to get any item or the length. If there's a for loop over the node list, this means the iterations will take O(n²) time in total. This causes real-world performance issues with potential for downtime (see GH-11308 and its references for details). We fix this by introducing a caching strategy. We cache the last iterated object in the iterator, the last requested item in the node list, and the last length computation. To invalidate the cache, we simply count the number of modifications made to the containing document. If the modification number does not match what the number was during caching, we know the document has been modified and the cache is invalid. If this ever overflows, we saturate the modification number and don't do any caching anymore. Note that we don't check for overflow on 64-bit systems because it would take hundreds of years to overflow. Fixes GH-11308.
141 lines
3.7 KiB
C
141 lines
3.7 KiB
C
/*
|
|
+----------------------------------------------------------------------+
|
|
| Copyright (c) The PHP Group |
|
|
+----------------------------------------------------------------------+
|
|
| This source file is subject to version 3.01 of the PHP license, |
|
|
| that is bundled with this package in the file LICENSE, and is |
|
|
| available through the world-wide-web at the following url: |
|
|
| https://www.php.net/license/3_01.txt |
|
|
| If you did not receive a copy of the PHP license and are unable to |
|
|
| obtain it through the world-wide-web, please send a note to |
|
|
| license@php.net so we can mail you a copy immediately. |
|
|
+----------------------------------------------------------------------+
|
|
| Authors: Christian Stocker <chregu@php.net> |
|
|
| Rob Richards <rrichards@php.net> |
|
|
+----------------------------------------------------------------------+
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include "php.h"
|
|
#if defined(HAVE_LIBXML) && defined(HAVE_DOM)
|
|
#include "php_dom.h"
|
|
|
|
/*
|
|
* class DOMProcessingInstruction extends DOMNode
|
|
*
|
|
* URL: https://www.w3.org/TR/2003/WD-DOM-Level-3-Core-20030226/DOM3-Core.html#ID-1004215813
|
|
* Since:
|
|
*/
|
|
|
|
/* {{{ */
|
|
PHP_METHOD(DOMProcessingInstruction, __construct)
|
|
{
|
|
xmlNodePtr nodep = NULL, oldnode = NULL;
|
|
dom_object *intern;
|
|
char *name, *value = NULL;
|
|
size_t name_len, value_len;
|
|
int name_valid;
|
|
|
|
if (zend_parse_parameters(ZEND_NUM_ARGS(), "s|s", &name, &name_len, &value, &value_len) == FAILURE) {
|
|
RETURN_THROWS();
|
|
}
|
|
|
|
name_valid = xmlValidateName((xmlChar *) name, 0);
|
|
if (name_valid != 0) {
|
|
php_dom_throw_error(INVALID_CHARACTER_ERR, 1);
|
|
RETURN_THROWS();
|
|
}
|
|
|
|
nodep = xmlNewPI((xmlChar *) name, (xmlChar *) value);
|
|
|
|
if (!nodep) {
|
|
php_dom_throw_error(INVALID_STATE_ERR, 1);
|
|
RETURN_THROWS();
|
|
}
|
|
|
|
intern = Z_DOMOBJ_P(ZEND_THIS);
|
|
oldnode = dom_object_get_node(intern);
|
|
if (oldnode != NULL) {
|
|
php_libxml_node_free_resource(oldnode );
|
|
}
|
|
php_libxml_increment_node_ptr((php_libxml_node_object *)intern, nodep, (void *)intern);
|
|
}
|
|
/* }}} end DOMProcessingInstruction::__construct */
|
|
|
|
/* {{{ target string
|
|
readonly=yes
|
|
URL: http://www.w3.org/TR/2003/WD-DOM-Level-3-Core-20030226/DOM3-Core.html#ID-1478689192
|
|
Since:
|
|
*/
|
|
int dom_processinginstruction_target_read(dom_object *obj, zval *retval)
|
|
{
|
|
xmlNodePtr nodep = dom_object_get_node(obj);
|
|
|
|
if (nodep == NULL) {
|
|
php_dom_throw_error(INVALID_STATE_ERR, 1);
|
|
return FAILURE;
|
|
}
|
|
|
|
ZVAL_STRING(retval, (char *) (nodep->name));
|
|
|
|
return SUCCESS;
|
|
}
|
|
|
|
/* }}} */
|
|
|
|
/* {{{ data string
|
|
readonly=no
|
|
URL: http://www.w3.org/TR/2003/WD-DOM-Level-3-Core-20030226/DOM3-Core.html#ID-837822393
|
|
Since:
|
|
*/
|
|
int dom_processinginstruction_data_read(dom_object *obj, zval *retval)
|
|
{
|
|
xmlNodePtr nodep;
|
|
xmlChar *content;
|
|
|
|
nodep = dom_object_get_node(obj);
|
|
|
|
if (nodep == NULL) {
|
|
php_dom_throw_error(INVALID_STATE_ERR, 1);
|
|
return FAILURE;
|
|
}
|
|
|
|
if ((content = xmlNodeGetContent(nodep)) != NULL) {
|
|
ZVAL_STRING(retval, (char *) content);
|
|
xmlFree(content);
|
|
} else {
|
|
ZVAL_EMPTY_STRING(retval);
|
|
}
|
|
|
|
return SUCCESS;
|
|
}
|
|
|
|
int dom_processinginstruction_data_write(dom_object *obj, zval *newval)
|
|
{
|
|
xmlNode *nodep = dom_object_get_node(obj);
|
|
zend_string *str;
|
|
|
|
if (nodep == NULL) {
|
|
php_dom_throw_error(INVALID_STATE_ERR, 1);
|
|
return FAILURE;
|
|
}
|
|
|
|
str = zval_try_get_string(newval);
|
|
if (UNEXPECTED(!str)) {
|
|
return FAILURE;
|
|
}
|
|
|
|
php_libxml_invalidate_node_list_cache_from_doc(nodep->doc);
|
|
|
|
xmlNodeSetContentLen(nodep, (xmlChar *) ZSTR_VAL(str), ZSTR_LEN(str) + 1);
|
|
|
|
zend_string_release_ex(str, 0);
|
|
return SUCCESS;
|
|
}
|
|
|
|
/* }}} */
|
|
|
|
#endif
|