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gh-140000: Traverse `name` attribute for `TypeVar`, `TypeVarTuple`, `TypeAliasType`, `ParamSpec` by efimov-mikhail · Pull Request #140016 · python/cpython · GitHub

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gh-140000: Traverse name attribute for TypeVar, TypeVarTuple, TypeAliasType, ParamSpec #140016

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Merged
JelleZijlstra merged 2 commits into from
Oct 13, 2025
Conversation 8 Commits 2 Checks 55 Files changed
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gh-140000: Traverse name attribute for TypeVar, TypeVarTuple, TypeAliasType, ParamSpec #140016

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Correct traversing name attribute for TypeVar, TypeVarTuple, TypeAlia…
efimov-mikhail Oct 12, 2025
585de5b
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efimov-mikhail Oct 13, 2025
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4 changes: 4 additions & 0 deletions Misc/NEWS.d/next/Core_and_Builtins/2025-10-13-17-56-23.gh-issue-140000.tLhn3e.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,4 @@
Fix potential memory leak when a reference cycle exists between an instance
of :class:`typing.TypeAliasType`, :class:`typing.TypeVar`,
:class:`typing.ParamSpec`, or :class:`typing.TypeVarTuple` and its
``__name__`` attribute. Patch by Mikhail Efimov.
16 changes: 12 additions & 4 deletions Objects/typevarobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -472,7 +472,7 @@ typevar_dealloc(PyObject *self)

_PyObject_GC_UNTRACK(self);

Py_DECREF(tv->name);
Py_XDECREF(tv->name);
Py_XDECREF(tv->bound);
Py_XDECREF(tv->evaluate_bound);
Py_XDECREF(tv->constraints);
Expand All @@ -491,6 +491,7 @@ typevar_traverse(PyObject *self, visitproc visit, void *arg)
{
Py_VISIT(Py_TYPE(self));
typevarobject *tv = typevarobject_CAST(self);
Py_VISIT(tv->name);
Py_VISIT(tv->bound);
Py_VISIT(tv->evaluate_bound);
Py_VISIT(tv->constraints);
Expand All @@ -505,6 +506,7 @@ static int
typevar_clear(PyObject *op)
{
typevarobject *self = typevarobject_CAST(op);
Py_CLEAR(self->name);
Py_CLEAR(self->bound);
Py_CLEAR(self->evaluate_bound);
Py_CLEAR(self->constraints);
Expand Down Expand Up @@ -1171,7 +1173,7 @@ paramspec_dealloc(PyObject *self)

_PyObject_GC_UNTRACK(self);

Py_DECREF(ps->name);
Py_XDECREF(ps->name);
Py_XDECREF(ps->bound);
Py_XDECREF(ps->default_value);
Py_XDECREF(ps->evaluate_default);
Expand All @@ -1187,6 +1189,7 @@ paramspec_traverse(PyObject *self, visitproc visit, void *arg)
{
Py_VISIT(Py_TYPE(self));
paramspecobject *ps = paramspecobject_CAST(self);
Py_VISIT(ps->name);
Py_VISIT(ps->bound);
Py_VISIT(ps->default_value);
Py_VISIT(ps->evaluate_default);
Expand All @@ -1198,6 +1201,7 @@ static int
paramspec_clear(PyObject *op)
{
paramspecobject *self = paramspecobject_CAST(op);
Py_CLEAR(self->name);
Py_CLEAR(self->bound);
Py_CLEAR(self->default_value);
Py_CLEAR(self->evaluate_default);
Expand Down Expand Up @@ -1519,7 +1523,7 @@ typevartuple_dealloc(PyObject *self)
_PyObject_GC_UNTRACK(self);
typevartupleobject *tvt = typevartupleobject_CAST(self);

Py_DECREF(tvt->name);
Py_XDECREF(tvt->name);
Py_XDECREF(tvt->default_value);
Py_XDECREF(tvt->evaluate_default);
PyObject_ClearManagedDict(self);
Expand Down Expand Up @@ -1683,6 +1687,7 @@ typevartuple_traverse(PyObject *self, visitproc visit, void *arg)
{
Py_VISIT(Py_TYPE(self));
typevartupleobject *tvt = typevartupleobject_CAST(self);
Py_VISIT(tvt->name);
Py_VISIT(tvt->default_value);
Py_VISIT(tvt->evaluate_default);
PyObject_VisitManagedDict(self, visit, arg);
Expand All @@ -1693,6 +1698,7 @@ static int
typevartuple_clear(PyObject *self)
{
typevartupleobject *tvt = typevartupleobject_CAST(self);
Py_CLEAR(tvt->name);
Py_CLEAR(tvt->default_value);
Py_CLEAR(tvt->evaluate_default);
PyObject_ClearManagedDict(self);
Expand Down Expand Up @@ -1851,7 +1857,7 @@ typealias_dealloc(PyObject *self)
PyTypeObject *tp = Py_TYPE(self);
_PyObject_GC_UNTRACK(self);
typealiasobject *ta = typealiasobject_CAST(self);
Py_DECREF(ta->name);
Py_XDECREF(ta->name);
Py_XDECREF(ta->type_params);
Py_XDECREF(ta->compute_value);
Py_XDECREF(ta->value);
Expand Down Expand Up @@ -2032,6 +2038,7 @@ static int
typealias_traverse(PyObject *op, visitproc visit, void *arg)
{
typealiasobject *self = typealiasobject_CAST(op);
Py_VISIT(self->name);
Py_VISIT(self->type_params);
Py_VISIT(self->compute_value);
Py_VISIT(self->value);
Expand All @@ -2043,6 +2050,7 @@ static int
typealias_clear(PyObject *op)
{
typealiasobject *self = typealiasobject_CAST(op);
Py_CLEAR(self->name);
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Py_CLEAR(self->type_params);
Py_CLEAR(self->compute_value);
Py_CLEAR(self->value);
Expand Down
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