- generators API exported for extensions
- improved RETURN sequence to avoid redundant check if op_array is a generator

Optimized access to temporary and compiled VM variables

- Fixed ZTS build

. The VM stacks for passing function arguments and syntaticaly nested calls were merged into a single stack. The stack size needed for op_array execution is calculated at compile time and preallocate

. The VM stacks for passing function arguments and syntaticaly nested calls were merged into a single stack. The stack size needed for op_array execution is calculated at compile time and preallocated at once. As result all the stack push operatins don't require checks for stack overflow any more.
. Generators implementation was improved using the new VM stack. Now it's a bit more clear and faster.

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Fix bug #63596: finally in generators segfaults

EX(fast_ret) wasn't initialized in this case so the code ended up
dereferencing an invalid pointer after the jump.

Improved "finally" im[plementation

Fixed bug #63428 (The behavior of execute() changed)

Fixed bug #63132

EG(arg_types_stack) is now also backed up when generators are used. This
allows the use of yield in nested method calls.

This commit adds two new functions to t

Fixed bug #63132

EG(arg_types_stack) is now also backed up when generators are used. This
allows the use of yield in nested method calls.

This commit adds two new functions to the zend_ptr_stack API:

zend_ptr_stack_push_from_memory
zend_ptr_stack_pop_into_memory

both taking the following arguments:

zend_ptr_stack *stack, int count, void **pointers

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Fix two op_array -> function cast warnings

- fix build, declarations must be 1st in a contextgit checkout -f master

Fixed bug #62991 (Segfault with generator and closure)

Fix typos

Fix segfault when traversing a by-ref generator twice

If you try to traverse an already closed generator an exception will now be
thrown.

Furthermore this changes the error for

Fix segfault when traversing a by-ref generator twice

If you try to traverse an already closed generator an exception will now be
thrown.

Furthermore this changes the error for traversing a by-val generator by-ref
from an E_ERROR to an Exception.

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Make sure that exception is thrown on rewind() after closing too

Fix several issues and allow rewind only at/before first yield

* Trying to resume a generator while it is already running now throws a
fatal error.
* Trying to use yield in fina

Fix several issues and allow rewind only at/before first yield

* Trying to resume a generator while it is already running now throws a
fatal error.
* Trying to use yield in finally while the generator is being force-closed
(by GC) throws a fatal error.
* Rewinding after the first yield now throws an Exception

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Run finally if generator is closed before finishing

Disallow serialization and unserialization

Drop Generator::close() method

Fix implementation of Iterator interface

It looks like you have to implement the Iterator interface *before*
assigning get_iterator. Otherwise the structure for user iterators isn't

Fix implementation of Iterator interface

It looks like you have to implement the Iterator interface *before*
assigning get_iterator. Otherwise the structure for user iterators isn't
correctly zeroed out.

Additionaly I'm setting class_entry->iterator_funcs.funcs now. Not sure if
this is strictly necessary, but better safe than sorry ;)

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Fix throwing of exceptions within a generator

If a generator threw an exception and was iterated using foreach (i.e. not
manually) an infinite loop was triggered. The reason was that the

Fix throwing of exceptions within a generator

If a generator threw an exception and was iterated using foreach (i.e. not
manually) an infinite loop was triggered. The reason was that the exception
was not properly rethrown using zend_throw_exception_internal.

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Remove asterix modifier (*) for generators

Generators are now automatically detected by the presence of a `yield`
expression in their body.

This removes the ZEND_SUSPEND_AND_RET

Remove asterix modifier (*) for generators

Generators are now automatically detected by the presence of a `yield`
expression in their body.

This removes the ZEND_SUSPEND_AND_RETURN_GENERATOR opcode. Instead
additional checks for ZEND_ACC_GENERATOR are added to the fcall_common
helper and zend_call_function.

This also adds a new function zend_generator_create_zval, which handles
the actual creation of the generator zval from an op array.

I feel like I should deglobalize the zend_create_execute_data_from_op_array
code a bit. It currently changes EG(current_execute_data) and
EG(opline_ptr) which is somewhat confusing (given the name).

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Add support by yielding by-reference

Disallow closing a generator during its execution

If a generator is closed while it is running an E_WARNING is thrown and the
call is ignored. Maybe a fatal error should be thrown instea

Disallow closing a generator during its execution

If a generator is closed while it is running an E_WARNING is thrown and the
call is ignored. Maybe a fatal error should be thrown instead?

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Pass zend_generator directly to Zend VM

Previously the zval* of the generator was passed into the VM by misusing
EG(return_value_ptr_ptr). Now the zend_generator* itself is directly pass

Pass zend_generator directly to Zend VM

Previously the zval* of the generator was passed into the VM by misusing
EG(return_value_ptr_ptr). Now the zend_generator* itself is directly passed
in. This saves us from always having to pass the zval* around everywhere.

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Implement get_iterator

This implements the get_iterator handler for Generator objects, thus making
direct foreach() iteration significantly faster.