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gh-142186: make PY_UNWIND available as a local event by P403n1x87 · Pull Request #142179 · python/cpython · GitHub

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gh-142186: make PY_UNWIND available as a local event - #142179

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P403n1x87:py-unwind-local-event
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gh-142186: make PY_UNWIND available as a local event#142179
P403n1x87 wants to merge 2 commits into
python:mainfrom
P403n1x87:py-unwind-local-event

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P403n1x87 commented Dec 2, 2025 •
edited by bedevere-app Bot
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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.

Example

import random, sys

m, e = sys.monitoring, sys.monitoring.events

m.use_tool_id(0, "debugger")

def monitor(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")

def foo():
    raise RuntimeError()

def bar():
    return foo()

def baz():
    return bar()

m.set_local_events(0, random.choice([foo, bar, baz]).__code__, e.PY_UNWIND | e.PY_START)

try:
    baz()
except Exception:
    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

P403n1x87 changed the title Make PY_UNWIND available as a local event gh-142186: make PY_UNWIND available as a local event Dec 2, 2025
bedevere-app Bot mentioned this pull request Dec 2, 2025
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P403n1x87 commented Dec 2, 2025
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Comment thread Include/cpython/monitoring.h
Comment on lines +27 to +33
((ev) <= PY_MONITORING_EVENT_STOP_ITERATION)

#define PY_MONITORING_EVENT_PY_UNWIND 11

#define PY_MONITORING_IS_LOCAL_EVENT(ev) \
((ev) < _PY_MONITORING_LOCAL_EVENTS)

P403n1x87 Dec 2, 2025

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

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

typedef struct _monitoring_event {
    int id;
    bool local;
    bool instrumented;
    char* name; // maybe
} monitoring_event_t;

monitoring_event_t MONITORING_EVENTS[] = { ... };

#define PY_MONITORING_IS_INSTRUMENTED_EVENT(ev) (MONITORING_EVENTS[ev].instrumented)

P403n1x87 marked this pull request as ready for review December 16, 2025 13:57
Make PY_UNWIND available as a local event
07a26bd 
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.
break local == instrumented assumption
1a3e828
P403n1x87 force-pushed the py-unwind-local-event branch from b5553ab to 1a3e828 Compare March 19, 2026 12:04

github-actions Bot commented May 3, 2026

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This PR is stale because it has been open for 30 days with no activity.

github-actions Bot added the stale Stale PR or inactive for long period of time. label May 3, 2026
P403n1x87 closed this May 3, 2026
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