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Date: Sun, 30 Nov 2014 14:14:48 +0400
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To: Ferenc Kovacs <tyra3l@gmail.com>
Cc: PHP Internals <internals@lists.php.net>, Matteo Beccati <matteo@beccati.com>, 
	Nikita Popov <nikita.ppv@gmail.com>, Xinchen Hui <xinchen.h@zend.com>
Content-Type: multipart/alternative; boundary=20cf30334e258c0f4f050910c35c
Subject: Re: [PHP-DEV] Re: EX(scope) removing
From: dmitry@zend.com (Dmitry Stogov)

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Sorry, I'll try to fix it on Monday.
is it a compilation problem, or how can reproduce it?

Thanks. Dmitry.

On Sat, Nov 29, 2014 at 1:01 AM, Ferenc Kovacs <tyra3l@gmail.com> wrote:

> 2014.11.28. 9:24 ezt =C3=ADrta ("Dmitry Stogov" <dmitry@zend.com>):
>
> >
> > On Fri, Nov 28, 2014 at 7:33 AM, Xinchen Hui <xinchen.h@zend.com> wrote=
:
> >
> > > Hey:
> > >
> > > On Fri, Nov 28, 2014 at 1:27 AM, Dmitry Stogov <dmitry@zend.com>
> wrote:
> > > > Hi,
> > > >
> > > > I'm working on call/return sequence optimization. As part of this
> work
> > > I'm
> > > > minimizing the size of call frame (zend_execute_data) and number of
> > > > read/write operations on call/return.
> > > >
> > > > Could you please take a look into the patch that removes EX(scope)
> > > > https://gist.github.com/dstogov/5ad50d582346385d587e
> > >
> >
> > committed.
> >
> > > All phpt tests are passed, but I'm not completely sure about one line=
 -
> > > >
> > >
> https://gist.github.com/dstogov/5ad50d582346385d587e#file-ex_scope-05-dif=
f-L193
> > > >
> > > > On the other hand I can't imagine what it may break.
> > > neither do I.
> > >
> > > >
> > > > Matteo, can you please run your test suites with this patch.
> > > >
> > > > PS: I'm also going to:
> > > > - pack EX(num_args) into reserved space of EX(This)
> > >
> >
> > done.
> >
> >
> > > > - try to get rid of EX(frame_info)
> > >
> >
> > done.
> >
> >
> > > > - try to merge EX(called_scope) and EX(This). Only one of them
> matters.
> > > > - try to replace zval EX(This) with a pointer to zend_object
> EX(object)
> > >
> > > Hmm, EX(This) is not like EX(object), it will be accessed by vm
> > > handler: get_obj_zval_ptr_unused
> > >
> > > it suppores to return a zval * there. if EX(This) became a zend_objec=
t
> > > *, then we may face different handlers for  IS_UNUSED and other types
> > > :<
> > >
> >
> > Yes, I know. After the latest changes it doesn't make a lot of sense to
> > replace ZVAL with ZEND_OBJECT*, because other data is already packed in=
to
> > the same ZVAL and it won't save any memory.
> >
> > Also zend_execute_data structure is aligned on zval boundary (16 bytes)=
,
> so
> > it makes sense to save another 16 bytes, but saving 8 bytes won't affec=
t
> VM
> > stack memory consumption.
> >
> > Thanks. Dmitry.
> >
>
> Fyi this change broke phpdbg in master.
>

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