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__pycache__	-	Open
bogus_code_obj.py	628 B	View DL Edit
gc_inspection.py	1.07 MB	View DL Edit
infinite_loop_re.py	653 B	View DL Edit
mutation_inside_cyclegc.py	753 B	View DL Edit
README	830 B	View DL Edit
recursive_call.py	372 B	View DL Edit
trace_at_recursion_limit.py	376 B	View DL Edit
underlying_dict.py	282 B	View DL Edit

Edit file: /opt/alt/python313/lib64/python3.13/test/crashers/gc_inspection.py

"""
gc.get_referrers() can be used to see objects before they are fully built.

Note that this is only an example.  There are many ways to crash Python
by using gc.get_referrers(), as well as many extension modules (even
when they are using perfectly documented patterns to build objects).

Identifying and removing all places that expose to the GC a
partially-built object is a long-term project.  A patch was proposed on
SF specifically for this example but I consider fixing just this single
example a bit pointless (#1517042).

A fix would include a whole-scale code review, possibly with an API
change to decouple object creation and GC registration, and according
fixes to the documentation for extension module writers.  It's unlikely
to happen, though.  So this is currently classified as
"gc.get_referrers() is dangerous, use only for debugging".
"""

import gc

def g():
    marker = object()
    yield marker
    # now the marker is in the tuple being constructed
    [tup] = [x for x in gc.get_referrers(marker) if type(x) is tuple]
    print(tup)
    print(tup[1])

tuple(g())

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