NULL out the execute_data before destroying it, otherwise GC may
trigger while the execute_data is partially destroyed, resulting
in double-frees.
The handling of call stack unfreezing is a bit awkward because it's
a ZEND_API function, so we can't change the signature.
The properties HT may be a GC root itself, so we need to remove it.
I'm not sure this issue actually applies to PHP 7.2, but committing
it there to be safe. As seen from the test case, the handling here
is rather buggy on 7.2.
In PHP 7.3 shadow properties are no longer duplicated. Make sure we
only release them if the property was defined on the parent class,
which means that it changed from private->shadow, which is where
duplication does happen.
When cleaning nops in the dfa pass, we were always keeping the
smart branch inhibiting nop that occurs directly before the jump
instruction. However, as we skip unreachable blocks entirely, it
may happen that we need to keep a nop that occurs further back,
prior to the unreachable blocks. Account for that case now.
We should really do something about the smart branch situation,
this is very fragile...
If we perform a class fetch that is not marked as exception safe,
convert exceptions thrown by autoloaders into a fatal error.
Ideally fetching the interfaces would be exception safe, but as it
isn't right now, we must abort at this point.
If a PHP file contains an invalid hex literal such as `0x_10`, the expected error
is `Parse error: syntax error, unexpected 'x_10' (T_STRING) in %s on line %d`.
This already worked correctly on Linux, but on Windows prior to this patch a different
error was produced: `Parse error: Invalid numeric literal in %s on line %d`.
When a HT iterator is one past the end and we rehash, we need to make
sure that it is move to the new one past the end position, to make
sure that newly inserted elements are picked up.
We only need to do this once we're running destructors. The current
approach interferes with some event loop code that runs everything
inside a shutdown function.
Dmitry Stogov