gh-142186: make PY_UNWIND available as a local event

[P403n1x87]

We make the PY_UNWIND monitoring event available as a code-local event to allow trapping on function exit events when an exception bubbles up. This complements the PY_RETURN event by allowing to catch any function exit event.

Example

importrandom, sysm, e=sys.monitoring, sys.monitoring.eventsm.use_tool_id(0, "debugger") defmonitor(event): def_(f): m.register_callback(0, event, f) return_@monitor(e.PY_START)def_(*_, **__): print("entering", sys._getframe(1)) @monitor(e.PY_UNWIND)def_(*_, **__): print("exiting ", sys._getframe(1), "with exception") deffoo(): raiseRuntimeError() defbar(): returnfoo() defbaz(): returnbar() m.set_local_events(0, random.choice([foo, bar, baz]).__code__, e.PY_UNWIND|e.PY_START) try: baz() exceptException: pass# entering <frame at 0x101602f80, file 'test_py_unwind_local.py', line 34, code baz># exiting <frame at 0x101602f80, file 'test_py_unwind_local.py', line 35, code baz> with exception

• Issue: Make the PY_UNWIND monitoring event local #142186

[P403n1x87]

IMO all these data should be encoded in a "table", e.g.

typedefstruct_monitoring_event{intid; boollocal; boolinstrumented; char*name; // maybe } monitoring_event_t; monitoring_event_tMONITORING_EVENTS[] ={... }; #definePY_MONITORING_IS_INSTRUMENTED_EVENT(ev) (MONITORING_EVENTS[ev].instrumented)