Newsgroups: php.internals
Path: news.php.net
Xref: news.php.net php.internals:6751
Mailing-List: contact internals-help@lists.php.net; run by ezmlm
Date: Fri, 2 Jan 2004 16:09:21 -0800
To: internals@lists.php.net
Message-ID: <20040103000921.GA3712@gravitonic.com>
References: <20040103000120.GA23760@csh.rit.edu>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20040103000120.GA23760@csh.rit.edu>
User-Agent: Mutt/1.4.1i
Subject: Re: [PHP-DEV] Custom object creation and reference counts
From: andrei@gravitonic.com (Andrei Zmievski)

On Fri, 02 Jan 2004, Jon Parise wrote:
> It looks like this code from zend_execute.c is responsible for the
> added reference:
> 
>     if (PZVAL_IS_REF(value) && value->refcount > 0) {
>         ALLOC_ZVAL(variable_ptr);
>         *variable_ptr_ptr = variable_ptr;
>         *variable_ptr = *value;
>         zval_copy_ctor(variable_ptr);
>         variable_ptr->refcount=1;
>         break;
>     }
> 
> In my case, 'value' is a reference (PZVAL_IS_REF(value) == 1), and in
> the case of the native PHP object, it isn't.  zval_copy_ctor() calls
> zend_objects_store_add_ref(), which increments the store object's
> reference count.
> 
> Two questions:
> 
> Why is my object being treated as a reference while the native PHP
> object is not?

I guess that is a question for you really: are you doing anything
special to make your object a reference? I've used the new object model
for PHP-GTK and my objects were not treated as references.


> 'variable_ptr->refcount=1;' resets the reference count of the
> variable's zval to 1, but the underlying _store_object's reference
> count is still incremented.  What will ever reclaim that reference on
> the _store_object?

zval_dtor() will. It calls del_ref on the underlying object.

- Andrei