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Date: Tue, 20 Jan 2026 18:27:00 +0100
Message-ID: <CABVsiphHB6M0Myj+5DvFT7xeJaz=LHrkPJdxsBfiDZCCgKMPHA@mail.gmail.com>
Subject: [PHP-DEV] Re: Optimization when extensions don't provide handlers
To: PHP internals <internals@lists.php.net>
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From: barel.barelon@gmail.com (Barel)

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On Tue, 20 Jan 2026 at 15:28, Barel <barel.barelon@gmail.com> wrote:

> Hi
>
> I have seen that the php-src uses some flags
> like ZEND_EXTENSIONS_HAVE_OP_ARRAY_HANDLER to optimise the code so that the
> loop that calls the op array handler is not called if no extension has set
> up an op array handler
>
> I wonder why this has not been done for
> the statement_handler, fcall_begin_handler and fcall_end_handler. This
> could be used to provide an optimised execution when no extension sets up a
> handler for these extension points
>
> Interested to know if there is a technical reason for this
>
> Cheers
>
> Carlos
>

OK, I reply to myself. I can see that these handlers are only called if the
corresponding opcodes are compiled and these are only compiled
if  ZEND_COMPILE_EXTENDED_STMT or ZEND_COMPILE_EXTENDED_FCALL are set. So
an extension that does not set these handlers would not set these compiler
flags, then there is no need to do any more optimization :-)

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<div dir=3D"ltr"><div dir=3D"ltr">On Tue, 20 Jan 2026 at 15:28, Barel &lt;<=
a href=3D"mailto:barel.barelon@gmail.com">barel.barelon@gmail.com</a>&gt; w=
rote:</div><div class=3D"gmail_quote gmail_quote_container"><blockquote cla=
ss=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid =
rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr">Hi<div><br></div><div>I=
 have seen that the php-src uses some flags like=C2=A0ZEND_EXTENSIONS_HAVE_=
OP_ARRAY_HANDLER to optimise the code so that the loop that calls the op ar=
ray handler is not called if no extension has set up an op array handler</d=
iv><div><br></div><div>I wonder why this has not been done for the=C2=A0sta=
tement_handler,=C2=A0fcall_begin_handler and=C2=A0fcall_end_handler. This c=
ould be used to provide an optimised execution when no extension sets up a =
handler for these extension points</div><div><br></div><div>Interested to k=
now if there is a technical reason for this<br><br>Cheers<br><br>Carlos</di=
v></div></blockquote><div><br>OK, I reply to myself. I can see that these h=
andlers are only called if the corresponding opcodes are compiled and these=
 are only compiled if=C2=A0=C2=A0ZEND_COMPILE_EXTENDED_STMT or=C2=A0ZEND_CO=
MPILE_EXTENDED_FCALL are set. So an extension that does not set these handl=
ers would not set these compiler flags, then there is no need to do any mor=
e optimization :-)<br></div></div></div>

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