type struct {
    OBJECT_HEADER;
    _PyInterpreterFrame *(*execute)(PyExecutorObject *self, _PyInterpreterFrame *frame, PyObject **stack_pointer);
    /* Data needed by the executor goes here, but is opaque to the VM */
} PyExecutorObject;

/* This would be nicer as an enum, but C doesn't define the size of enums */
#define PY_OPTIMIZE_FUNCTION_ENTRY 1
#define PY_OPTIMIZE_RESUME_AFTER_YIELD 2
#define PY_OPTIMIZE_BACK_EDGE 4
typedef uint32_t PyOptimizerCapabilities;

type struct {
    OBJECT_HEADER;
    PyExecutorObject *(*compile)(PyOptimizerObject* self, PyCodeObject *code, int offset);
    PyOptimizerCapabilities capabilities;
    float optimization_cost;
    float run_cost;
    /* Data needed by the compiler goes here, but is opaque to the VM */
} PyOptimizerObject;

void _Py_Executor_Replace(PyCodeObject *code, int offset, PyExecutorObject *executor);

int _Py_Optimizer_Register(PyOptimizerObject* optimizer);