-ZEND_RESULT_CODE psi_parse_args(zend_execute_data *execute_data, impl *impl);
-impl_val *psi_do_let(decl_arg *darg);
-void psi_do_set(zval *return_value, set_func *func, decl_vars *vars);
-void psi_do_return(impl *impl, impl_val *ret_val, zval *return_value);
-void psi_do_free(free_stmt *fre);
-void psi_do_clean(impl *impl);