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Date: Mon, 28 Oct 2019 10:03:50 +0100
Message-ID: <CAG9XoMT0JB5NEN_CXrRUWmV3oNk6r5zMM1qhCTmkVBsQnBzdCg@mail.gmail.com>
To: Andreas Hennings <andreas@dqxtech.net>
Cc: Mike Schinkel <mike@newclarity.net>, Rowan Tommins <rowan.collins@gmail.com>, 
	PHP Internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] Optional pre-compiler for PHP8?
From: benjamin.morel@gmail.com (Benjamin Morel)

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>
> This would break as soon as we have two versions of a class, and a
> runtime choice which of them to use.
> (see also Mark Randall's comment)



That's why I'm suggesting to only make these optimizations when preloading
<https://wiki.php.net/rfc/preload>is in use, which means that you know
ahead of time the class definitions, and you cannot have 2 runtime
definitions of a given class.

No preloading =3D no optimizations.
Full preloading (whole codebase) =3D maximum optimizations.
Partial preloading =3D the compiler should still be able to optimize *some =
*of
the code involving only the preloaded classes.

We already have, since PHP 7.4, a mechanism to know static class
definitions on startup, so why not build further optimizations on top of it=
?

=E2=81=A0=E2=80=94 Benjamin

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