Clear func_version_cache in interpreter_clear()

This should fix leaks and hopefully most failing tests.

Author: gvanrossum

Include/internal/pycore_function.h

@@ -30,7 +30,7 @@ extern PyFunctionObject* _PyFunction_FromConstructor(PyFrameConstructor *constr)
 extern uint32_t _PyFunction_GetVersionForCurrentState(PyFunctionObject *func);
 extern void _PyFunction_SetVersion(PyFunctionObject *func, uint32_t version);
 PyFunctionObject *_PyFunction_LookupByVersion(uint32_t version);
-void _PyFunction_ClearByVersionCache(void);
+void _PyFunction_ClearByVersionCache(PyInterpreterState *interp);
 
 extern PyObject *_Py_set_function_type_params(
     PyThreadState* unused, PyObject *func, PyObject *type_params);

Objects/funcobject.c

@@ -250,9 +250,8 @@ _PyFunction_LookupByVersion(uint32_t version)
 }
 
 void
-_PyFunction_ClearByVersionCache(void)
+_PyFunction_ClearByVersionCache(PyInterpreterState *interp)
 {
-    PyInterpreterState *interp = _PyInterpreterState_GET();
     for (int i = 0; i < FUNC_VERSION_CACHE_SIZE; i++) {
         PyFunctionObject **slot = interp->func_state.func_version_cache + i;
         Py_CLEAR(*slot);

Python/pystate.c

@@ -840,6 +840,9 @@ interpreter_clear(PyInterpreterState *interp, PyThreadState *tstate)
      */
     // XXX Make sure we properly deal with problematic finalizers.
 
+    interp->func_state.next_version = 0;  // No more new versions
+    _PyFunction_ClearByVersionCache(interp);
+
     Py_CLEAR(interp->audit_hooks);
 
     for (int i = 0; i < _PY_MONITORING_UNGROUPED_EVENTS; i++) {

Python/sysmodule.c

@@ -2080,7 +2080,8 @@ sys__clear_type_cache_impl(PyObject *module)
 {
     PyType_ClearCache();
     // Also clear the function-by-version cache
-    _PyFunction_ClearByVersionCache();
+    PyInterpreterState *interp = _PyInterpreterState_GET();
+    _PyFunction_ClearByVersionCache(interp);
     Py_RETURN_NONE;
 }