10000 [3.13] gh-130851: Only intern constants of types generated by the compiler (GH-130901) by colesbury · Pull Request #130953 · python/cpython · GitHub
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[3.13] gh-130851: Only intern constants of types generated by the compiler (GH-130901) #130953

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Merged
merged 1 commit into from
Mar 8, 2025
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[3.13] gh-130851: Only intern constants of types generated by the compiler (GH-130901) #130953

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36 changes: 34 additions & 2 deletions Objects/codeobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -132,6 +132,38 @@ should_intern_string(PyObject *o)

#ifdef Py_GIL_DISABLED
static PyObject *intern_one_constant(PyObject *op);

// gh-130851: In the free threading build, we intern and immortalize most
// constants, except code objects. However, users can generate code objects
// with arbitrary co_consts. We don't want to immortalize or intern unexpected
// constants or tuples/sets containing unexpected constants.
static int
should_immortalize_constant(PyObject *v)
{
// Only immortalize containers if we've already immortalized all their
// elements.
if (PyTuple_CheckExact(v)) {
for (Py_ssize_t i = PyTuple_GET_SIZE(v); --i >= 0; ) {
if (!_Py_IsImmortal(PyTuple_GET_ITEM(v, i))) {
return 0;
}
}
return 1;
}
else if (PyFrozenSet_CheckExact(v)) {
PyObject *item;
Py_hash_t hash;
Py_ssize_t pos = 0;
while (_PySet_NextEntry(v, &pos, &item, &hash)) {
if (!_Py_IsImmortal(item)) {
return 0;
}
}
return 1;
}
return (PyLong_CheckExact(v) || PyFloat_CheckExact(v) ||
PyComplex_Check(v) || PyBytes_CheckExact(v));
}
#endif

static int
Expand Down Expand Up @@ -240,8 +272,8 @@ intern_constants(PyObject *tuple, int *modified)
// we are also immortalizing objects that use deferred reference
// counting.
PyThreadState *tstate = PyThreadState_GET();
if (!_Py_IsImmortal(v) && !PyCode_Check(v) &&
!PyUnicode_CheckExact(v) &&
if (!_Py_IsImmortal(v) && !PyUnicode_CheckExact(v) &&
should_immortalize_constant(v) &&
_Py_atomic_load_int(&tstate->interp->gc.immortalize) >= 0)
{
PyObject *interned = intern_one_constant(v);
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