Move all rebinding checks into one function to make sure they stay
in sync. Normalize return value to be NULL for all rebinding
failures, instead of returning an improperly bound closure in some
cases.
As it turns out, there is actually no reason to prevent this, it even was a bigger BC break than expected...
Also fixes a memory leak (the Closure leaks) when calling internal functions via Closure by moving it out of leave helper onto caller side for TOP_CODE:
$z = new SplStack; $z->push(20);
$x = (new ReflectionMethod("SplStack", "pop"))->getClosure($z);
var_dump($x());
Now it is completely impossible to rebind a scoped method Closure (only the kind you get from ReflectionMethod::getClosure()) to a foreign scope
Adding a lot of tests to ensure this...
Also, properly return NULL in case the Closure could not be created instead of some crippled unbound Closure
This additionally removes support for binding to an unknown (not in parent hierarchy) scope.
Removing support for cross-scope is necessary for certain compile-time assumptions (like class constants) to prevent unexpected results
This also fixes a memory "leak" (memory is allocated on unbounded arena without limits) on each new Closure instantiation.
Closures with same scope now all share the same run_time_cache (as long as it is arena allocated)
It makes no sense that you can't write a closure using $this in a
static method, even though you can write one outside a class.
Now only closures that have been marked as static will be considered
to be static.
Fixes bug #65598.
Closures will now use the called_scope from their instantiation
site. If they are rebound either the class of $this is used or if
no $this is provided the bound scope is used.
With this change the scope for static closures can be changed back
to use EG(scope) rather than EX(called_scope), thus fixing
bug #69568.
Now each HashTable is also zend_array, so it's refcounted and may be a subject for Copy on Write
zend_array_dup() was changed to allocate and return HashTable, instead of taking preallocated HashTable as argument.
