php-src/Zend/zend_variables.c

/*
   +----------------------------------------------------------------------+
   | Zend Engine                                                          |
   +----------------------------------------------------------------------+
   | Copyright (c) 1998, 1999 Andi Gutmans, Zeev Suraski                  |
   +----------------------------------------------------------------------+
   | This source file is subject to version 0.91 of the Zend license,     |
   | that is bundled with this package in the file LICENSE, and is        | 
   | available at through the world-wide-web at                           |
   | http://www.zend.com/license/0_91.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: Andi Gutmans <andi@zend.com>                                |
   |          Zeev Suraski <zeev@zend.com>                                |
   +----------------------------------------------------------------------+
*/


#include <stdio.h>
#include "zend.h"
#include "zend_API.h"
#include "zend_globals.h"
#include "zend_constants.h"
#include "zend_variables.h"
#include "zend_list.h"

ZEND_API char *empty_string = "";	/* in order to save emalloc() and efree() time for
									 * empty strings (usually used to denote empty
									 * return values in failed functions).
									 * The macro STR_FREE() will not efree() it.
									 */

ZEND_API char *undefined_variable_string = "\0";

/* this function MUST set the value for the variable to an empty string */
/* and empty strings must be evaluated as FALSE */
ZEND_API inline void var_reset(zval *var)
{
	var->type = IS_STRING;
	var->value.str.val = empty_string;
	var->value.str.len = 0;
}

ZEND_API inline void var_uninit(zval *var)
{
	var->type = IS_STRING;
	var->value.str.val = undefined_variable_string;
	var->value.str.len = 0;
}
		

ZEND_API int _zval_dtor(zval *zvalue ZEND_FILE_LINE_DC)
{
	if (zvalue->type==IS_LONG) {
		return 1;
	}
	switch(zvalue->type) {
		case IS_STRING:
		case IS_CONSTANT:
			STR_FREE_REL(zvalue->value.str.val);
			break;
		case IS_ARRAY: {
				ELS_FETCH();

				if (zvalue->value.ht && (zvalue->value.ht != &EG(symbol_table))) {
					zend_hash_destroy(zvalue->value.ht);
					efree_rel(zvalue->value.ht);
				}
			}
			break;
		case IS_OBJECT:
			zend_hash_destroy(zvalue->value.obj.properties);
			efree_rel(zvalue->value.obj.properties);
			break;
		case IS_RESOURCE:
			/* destroy resource */
			zend_list_delete(zvalue->value.lval);
			break;
		case IS_LONG:
		case IS_DOUBLE:
		case IS_BOOL:
		default:
			return 1;
			break;
	}
	return 1;
}


void zval_del_ref(zval **p)
{
	(*p)->refcount--;
	if ((*p)->refcount==0) {
		zval_dtor(*p);
		efree(*p);
	}
}                                                                                                                               


void zval_add_ref(zval **p)
{
	(*p)->refcount++;
}


ZEND_API int _zval_copy_ctor(zval *zvalue ZEND_FILE_LINE_DC)
{
	switch (zvalue->type) {
		case IS_RESOURCE:
			zend_list_addref(zvalue->value.lval);
			break;
		case IS_BOOL:
		case IS_LONG:
			break;
		case IS_STRING:
			if (zvalue->value.str.val) {
				if (zvalue->value.str.len==0) {
					if (zvalue->value.str.val==undefined_variable_string) {
						zvalue->value.str.val = undefined_variable_string;
					} else {
						zvalue->value.str.val = empty_string;
					}
					return SUCCESS;
				}
			}
			zvalue->value.str.val = (char *) estrndup_rel(zvalue->value.str.val, zvalue->value.str.len);
			break;
		case IS_ARRAY: {
				zval *tmp;
				HashTable *original_ht = zvalue->value.ht;
				ELS_FETCH();

				if (!zvalue->value.ht) {
					var_reset(zvalue);
					return FAILURE;
				} else if (zvalue->value.ht==&EG(symbol_table)) {
					return SUCCESS; /* do nothing */
				}
				zvalue->value.ht = (HashTable *) emalloc_rel(sizeof(HashTable));
				zend_hash_init(zvalue->value.ht, 0, NULL, PVAL_PTR_DTOR, 0);
				zend_hash_copy(zvalue->value.ht, original_ht, (void (*)(void *)) zval_add_ref, (void *) &tmp, sizeof(zval *));
			}
			break;
		case IS_OBJECT: {
				zval *tmp;
				HashTable *original_ht = zvalue->value.obj.properties;

				zvalue->value.obj.properties = (HashTable *) emalloc_rel(sizeof(HashTable));
				zend_hash_init(zvalue->value.obj.properties, 0, NULL, PVAL_PTR_DTOR, 0);
				zend_hash_copy(zvalue->value.obj.properties, original_ht, (void (*)(void *)) zval_add_ref, (void *) &tmp, sizeof(zval *));
			}
			break;
	}
	return SUCCESS;
}


ZEND_API int zend_print_variable(zval *var) 
{
	return zend_print_zval(var, 0);
}


#if ZEND_DEBUG
ZEND_API int _zval_copy_ctor_wrapper(zval *zvalue)
{
	return zval_copy_ctor(zvalue);
}


ZEND_API int _zval_dtor_wrapper(zval *zvalue)
{
	return zval_dtor(zvalue);
}



ZEND_API int _zval_ptr_dtor_wrapper(zval **zval_ptr)
{
	return zval_ptr_dtor(zval_ptr);
}
#endif


/*
 * Local variables:
 * tab-width: 4
 * c-basic-offset: 4
 * End:
 */