gh-142186: all-local PEP-669 events#146182
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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.
We make all the events of the low-impact monitoring API local, shifting the distinction to whether they are instrumented or non-instrumented.
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P403n1x87
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Mar 19, 2026
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| assert(_PY_MONITORING_IS_UNGROUPED_EVENT(event)); | ||
| CHECK(debug_check_sanity(interp, code)); | ||
| if (code->_co_monitoring->tools) { | ||
| tools = code->_co_monitoring->tools[i]; | ||
| } | ||
| else { | ||
| tools = interp->monitors.tools[event]; | ||
| tools = code->_co_monitoring->active_monitors.tools[event]; |
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We make all the low-impact monitoring API events implemented by PEP-669 local on a per-code object basis. All the events can now be enabled on selected code objects. The distinction is now between instrumented and non-instrumented events, whereby the behaviour of the
DISABLEsentinel value differs. For instrumented events,DISABLEwill remove the instrumentation at the specific code location where the value was returned. For non-instrumented events,DISABLEwill simply disable the event for the whole code object.PY_UNWINDmonitoring event local #142186📚 Documentation preview 📚: https://cpython-previews--146182.org.readthedocs.build/