Bug #80634 [Opn->Ver]: write_property handler of internal classes is skipped on preloaded JITted code
Edit report at https://bugs.php.net/bug.php?id=80634&edit=1
ID: 80634
Updated by: nikic@php.net
Reported by: dktapps at pmmp dot io
Summary: write_property handler of internal classes is
skipped on preloaded JITted code
-Status: Open
+Status: Verified
Type: Bug
Package: JIT
Operating System: Linux
PHP Version: 8.0.1
-Assigned To:
+Assigned To: dmitry
Block user comment: N
Private report: N
New Comment:
Confirm the behavior. I believe the problem is that under preloading we have a prop_info available
here and will generate code based on that and end up ignoring the write_property handler (under
needs_slow_path) entirely. Without preloading we only inherit the class at runtime and the problem
doesn't occur (but I think as tracing also collects classes at runtime, there is probably some
way for it to occur without preloading as well).
Unfortunately, we don't have static information on whether a class of an object has overwritten
write_property -- this is determined by the create_object handler and not stored in the class entry.
I think the correct thing to do here is to conservatively not use any prop_info from internal
classes (or classes with internal parents).
@dmitry What do you think about this?
Previous Comments:
------------------------------------------------------------------------
[2021-01-15 23:13:39] dktapps at pmmp dot io
Description:
------------
When a class which extends an internal class is preloaded and JIT-compiled, the internal class'
write_property handler doesn't get executed. Without preloading it works correctly.
This requires quite an exotic test case to reproduce. While the test case itself doesn't make
any sense, it's a case that I've encountered while updating an extension with real code,
and I spent some time to create a reproducing test case only using PHP's own builtin classes to
ensure that it wasn't some crazy bug in my extension.
Command line is php -dopcache.enable_cli=1 -dopcache.jit=1205 -dopcache.preload=preload.php
test.php
Test script:
---------------
preload.php:
<?php
class SomeClass extends \DatePeriod{
public $interval;
public function __construct(int $v){
parent::__construct(new \DateTime('2020-12-31'), new \DateInterval("P1Y"), 1);
$this->interval = $v;
var_dump($this->interval);
}
}
test.php:
<?php
$v = new SomeClass(5);
Expected result:
----------------
(this output is produced without preloading or JIT)
PHP Fatal error: Uncaught Error: Writing to DatePeriod->interval is unsupported in
/home/user/pocketmine-mp/preload.php:8
Stack trace:
#0 /home/user/pocketmine-mp/test.php(3): SomeClass->__construct()
#1 {main}
thrown in /home/user/pocketmine-mp/preload.php on line 8
Actual result:
--------------
int(5)
------------------------------------------------------------------------
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Edit this bug report at https://bugs.php.net/bug.php?id=80634&edit=1
Thread (3 messages)