> -----Original Message-----
> From: Marcus Boerger [mailto:[EMAIL PROTECTED]
> Sent: Friday, March 14, 2008 9:28 PM
> To: Stas Malyshev
> Cc: [email protected]
> Subject: Re: [PHP-DEV] Patch for opcode caches
>
>
> Hello Stanislav,
>
> Friday, March 14, 2008, 6:48:52 PM, you wrote:
>
> > Hi!
>
> >> Lemme just think, doing inheritance at compile time before we send
> >> the stuff to an opcode cache can be slower then? How is that
> >> possible? After all late binding means we do it at run
> time. And no
> >> matter how much faster we can do it. It will always be slower than
> >> doing the same thing only once.
>
> > I'm taking this off-list because it doesn't seem to go any
> direction
> > it
> > can be useful for people to read.
>
> Hmm, so other people must not read what we discuss, that does
> not work.
>
> > Repeating again: it can not be done "only once". Not with opcode
> > caches
> > present and bound entities living in separate file. This
> thing is not
> > possible. If you do not believe it - try to implement it and see.
>
> That is my point. It can be done.
Look into the example:
parent1.php
<?php
class Foo {...}
?>
parent2.php
<?php
class Foo {...}
?>
child.php
<?php
class Bar extens Foo {...}
?>
index1.php
<?php
include "parent1.php";
include "child.php";
?>
index2.php
<?php
include "parent2.php";
include "child.php";
?>
Do you still think if early-binding for class Bar is possible at
compile-time with opcode caches?
And what "Foo" is the parent?
> The reason to delay
> inheritance is that we can have a conditional statement
> around a class definition.
There is no "if' statement in example above.
Also detection of conditional code is additional pine for caches.
> If we detect classes that do not
> have conditionals around them, then we can bind them early.
It's wrong.
> It is as easy as that. So instead of making the language more
> dynamic and even removing a chance of having inheritance
> dones early where possible we should work on making the
> desired case - eraly binding - as easy as possible.
The proposed patch allows caches to implement proper behavior of
early-biniding in most easy way. (~5 lines of code)
Thanks. Dmitry.
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