[PHP-DEV] Reusing main VM stack for generators

[Dmitry Stogov]

Hi,


Could you please, take a look into the PoC.

It's incomplete, but may be you get ideas how to fix this.


https://gist.github.com/dstogov/285024375d15cacf2a9b


Few tests are failed, because YIELD may be used as expression in nested calls 
(between INIT_FCALL/DO_FCALL), and the caller function restores 
EG(vm_stack_top), loosing and overwriting that active frame.


<?php
function gen() {
    var_dump(yield 1);
}

for ($gen = gen(); $gen->valid(); $gen->send(0)) {
    var_dump($gen->current());
}
?>


Thanks. Dmitry.