Prevent opcache from inlining functions with return-value rules on PHP 8.5+optim85

PHP 8.5's opcache optimizer can inline trivial user functions (constant
return values), completely eliminating the DO_UCALL opcode. When this
happens, zend_execute_ex is never invoked and snuffleupagus's
return-value monitoring hooks never fire.

Fix this by setting ZEND_ACC_HAS_TYPE_HINTS on monitored functions'
op_arrays during compilation (via sp_op_array_handler). This flag is
checked by opcache's zend_try_inline_call() and prevents inlining.
For 0-arg functions — the only ones eligible for inlining — there are
no RECV opcodes, so the runtime impact is zero.

To enable sp_op_array_handler when return-value rules are configured,
the extension now registers itself as a zend extension and sets
ZEND_COMPILE_HANDLE_OP_ARRAY (previously only done for global_strict).

The disabled_function_echo_2 test is updated to use separate echo
statements and opcache.optimization_level=0, since opcache's echo
merging is a compile-time string concatenation that cannot be prevented
per-function.

This is a bit ugly, but it's the less awful solution to be able to hook return
values.

0 files changed, 0 insertions, 0 deletions