Restructure argument passing onto stack - #1679
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Zend/zend_API.c
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We should remove deprecated API by separate commit: zend_get_parameters(), zend_get_parameters_ex(), zend_copy_parameters_array().
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The patch is too big for github. zend_vm_def.h changes don't fit :( |
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December 16, 2015 20:31
Arguments now are prepended to the execute_data, inside the (last!) temporaries of the previous stack frame. Every stack frame has place for sent arguments plus five optional args (RECV_INIT...) and the execute_data. This allows EG(vm_stack_top) and EX(call) to be removed and saves us from expensive comparisons to push a call frame completely in some cases (every ICALL). The only downside is that arguments now are in reverse order causing variadics to be in reverse order on the stack; extensions might need some update ... Also, freeing of args and execute_data is now completely handled by liveness. Finally, the patch gives 0.5%-3% improvement on applications. There likely is still some room for optimization (e.g. eliminating ZEND_SEND_VAL with TMPs or speeding up the unpacking, removing INIT_FCALL for UCALLs, ...).
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* master: Fixed incorrect exception handling Align NEWS entry format Align NEWS entry format Align news entry format: Implement FR -> Implemented FR Align news entry format: Implement FR -> Implemented FR Update NEWs Fixed bug #71127 (Define in auto_prepend_file is overwrite) Fix proto and arg info Implemented FR #48532 (Allow pg_fetch_all() to index numerically). Implemented FR #31021 (pg_result_notice() is needed to get all notice messages). Remove sqlite extension leftover references (was removed in PHP 5.4) Fix ZTS build Fix naming
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Arguments now are prepended to the execute_data, inside the (last!) temporaries of the previous stack frame. Every stack frame has place for sent arguments plus five optional args (RECV_INIT...) and the execute_data.
This allows EG(vm_stack_top) and EX(call) to be removed and saves us from expensive comparisons to push a call frame completely in some cases (every ICALL).
The only downside is that arguments now are in reverse order causing variadics to be in reverse order on the stack; extensions might need some update ...
Also, freeing of args and execute_data is now completely handled by liveness.
Finally, the patch gives 0.5%-3% improvement on applications.
There likely is still some room for optimization (e.g. eliminating ZEND_SEND_VAL with TMPs or speeding up the unpacking, removing INIT_FCALL for UCALLs, ...).