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Re: Consistency with object to boolean conversions

From "Christoph M. Becker" <cmbecker69@arcor.de>
Newsgroups comp.lang.php
Subject Re: Consistency with object to boolean conversions
Date 2014-12-03 19:30 +0100
Organization solani.org
Message-ID <m5nkr6$mtk$1@solani.org> (permalink)
References <m5n8a7$gra$1@dont-email.me> <m5neof$125$6@dont-email.me> <m5ng47$k3d$1@dont-email.me> <m5ngtb$8dj$1@solani.org> <m5njqb$4cf$1@dont-email.me>

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Gregor Kofler wrote:

> Am 2014-12-03 um 18:22 schrieb Christoph M. Becker:
>> Gregor Kofler wrote:
>>
>>> it still doesn't explain why casting to boolean in the if condition
>>> doesn't throw an error.
>>
>> Indeed.  Might that be caused by some dubious optimization (e.g. by
>> OPcache)?
> 
> Indeed. Since my 5.5.9 shows the above behaviour but 5.4.35 already
> fails at line 50.

It seems I found the cause.  The if statement emits the opcodes
BOOL_NOT, JMPZ (according to VLD), what is optimized by OPcache to NOP,
JMPNZ[1].  So when the code is executed by OPcache, there is no
conversion involved for the if clause.  IMHO that makes changing the
behavior of SplFileInfo objects wrt. issue #65213 even more important.

[1] <http://lxr.php.net/xref/PHP_5_5/ext/opcache/Optimizer/block_pass.c#816>
[2] <https://bugs.php.net/bug.php?id=65213>

-- 
Christoph M. Becker

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Thread

Consistency with object to boolean conversions Gregor Kofler <usenet@gregorkofler.com> - 2014-12-03 15:56 +0100
  Re: Consistency with object to boolean conversions "Christoph M. Becker" <cmbecker69@arcor.de> - 2014-12-03 16:19 +0100
    Re: Consistency with object to boolean conversions Gregor Kofler <usenet@gregorkofler.com> - 2014-12-03 16:39 +0100
      Re: Consistency with object to boolean conversions Matthew Carter <m@ahungry.com> - 2014-12-03 11:42 -0500
        Re: Consistency with object to boolean conversions Gregor Kofler <usenet@gregorkofler.com> - 2014-12-03 18:06 +0100
          Re: Consistency with object to boolean conversions Matthew Carter <m@ahungry.com> - 2014-12-03 13:13 -0500
  Re: Consistency with object to boolean conversions Denis McMahon <denismfmcmahon@gmail.com> - 2014-12-03 16:46 +0000
    Re: Consistency with object to boolean conversions Gregor Kofler <usenet@gregorkofler.com> - 2014-12-03 18:09 +0100
      Re: Consistency with object to boolean conversions "Christoph M. Becker" <cmbecker69@arcor.de> - 2014-12-03 18:22 +0100
        Re: Consistency with object to boolean conversions Gregor Kofler <usenet@gregorkofler.com> - 2014-12-03 19:12 +0100
          Re: Consistency with object to boolean conversions "Christoph M. Becker" <cmbecker69@arcor.de> - 2014-12-03 19:30 +0100
            Re: Consistency with object to boolean conversions Gregor Kofler <usenet@gregorkofler.com> - 2014-12-03 20:58 +0100

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