Description
This issue started over in docker-library/php#1545 because I initially thought this was an issue with the Debian based Docker images for PHP 8.4.0RC, but since then @yosifkit and @tianon helped with realizing that it's not related to Docker at all.
The problem
This is a minimal example of a class with a property that has a set-hook, but specifically no get-hook. When you create a lazy ghost object from this class and try to access its property, PHP should call its initialization function. And it usually does.
Test code
<?php
class Foo {
public string $bar {
set => $value;
}
}
$reflector = new ReflectionClass(Foo::class);
$foo = $reflector->newLazyGhost(function ($ghost) {
$ghost->bar = 'bar';
});
echo $foo->bar;Expected output
Actual output
However, when PHP was compiled with GCC 12.2.0 (I did not have time to test any other versions) and CFLAGS="-O2", the code throws the following fatal error instead:
Fatal error: Uncaught Error: Typed property Foo::$bar must not be accessed before initialization in /workspace/test.php:15
Stack trace:
#0 {main}
thrown in /workspace/test.php on line 15
Some more information
GCC 12.2.0 is the current version shipped with Debian "Bookworm", hence why this bug appears in the official Docker images. However, I could reproduce it outside of Docker, on a different Linux distribution, but with the same compiler version. So GCC was the common denominator, as far as I could tell.
@yosifkit could also reproduce the issue with Debian's PHP 8.4 package from the experimental repository.
In the other thread, we suspected that this could be a compiler bug in GCC. However, I'm not well-versed enough in compilers - or the internals of PHP for that matter - to really tell. So I'm leaving this here with all the information I could gather for someone who can.
PHP Version
PHP 8.4.0RC3
Operating System
No response
Description
This issue started over in docker-library/php#1545 because I initially thought this was an issue with the Debian based Docker images for PHP 8.4.0RC, but since then @yosifkit and @tianon helped with realizing that it's not related to Docker at all.
The problem
This is a minimal example of a class with a property that has a set-hook, but specifically no get-hook. When you create a lazy ghost object from this class and try to access its property, PHP should call its initialization function. And it usually does.
Test code
Expected output
Actual output
However, when PHP was compiled with GCC 12.2.0 (I did not have time to test any other versions) and
CFLAGS="-O2", the code throws the following fatal error instead:Some more information
GCC 12.2.0 is the current version shipped with Debian "Bookworm", hence why this bug appears in the official Docker images. However, I could reproduce it outside of Docker, on a different Linux distribution, but with the same compiler version. So GCC was the common denominator, as far as I could tell.
@yosifkit could also reproduce the issue with Debian's PHP 8.4 package from the experimental repository.
In the other thread, we suspected that this could be a compiler bug in GCC. However, I'm not well-versed enough in compilers - or the internals of PHP for that matter - to really tell. So I'm leaving this here with all the information I could gather for someone who can.
PHP Version
PHP 8.4.0RC3
Operating System
No response