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gh-132775: Add _PyCode_VerifyStateless() (gh-133221)

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"Stateless" code is a function or code object which does not rely on external state or internal state.
It may rely on arguments and builtins, but not globals or a closure. I've left a comment in
pycore_code.h that provides more detail.

We also add _PyFunction_VerifyStateless(). The new functions will be used in several later changes
that facilitate "sharing" functions and code objects between interpreters.
This commit is contained in:
Eric Snow 2025-05-05 15:48:58 -06:00 • committed by GitHub
parent f610bbdf74
commit d270bb5792
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8 changed files with 442 additions and 38 deletions
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44
Modules/_testinternalcapi.c
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@ -1165,6 +1165,48 @@ error:
return NULL;
}
static PyObject *
verify_stateless_code(PyObject *self, PyObject *args, PyObject *kwargs)
{
PyThreadState *tstate = _PyThreadState_GET();
PyObject *codearg;
PyObject *globalnames = NULL;
PyObject *globalsns = NULL;
PyObject *builtinsns = NULL;
static char *kwlist[] = {"code", "globalnames",
"globalsns", "builtinsns", NULL};
if (!PyArg_ParseTupleAndKeywords(args, kwargs,
"O|O!O!O!:get_code_var_counts", kwlist,
&codearg, &PySet_Type, &globalnames,
&PyDict_Type, &globalsns, &PyDict_Type, &builtinsns))
{
return NULL;
}
if (PyFunction_Check(codearg)) {
if (globalsns == NULL) {
globalsns = PyFunction_GET_GLOBALS(codearg);
}
if (builtinsns == NULL) {
builtinsns = PyFunction_GET_BUILTINS(codearg);
}
codearg = PyFunction_GET_CODE(codearg);
}
else if (!PyCode_Check(codearg)) {
PyErr_SetString(PyExc_TypeError,
"argument must be a code object or a function");
return NULL;
}
PyCodeObject *code = (PyCodeObject *)codearg;
if (_PyCode_VerifyStateless(
tstate, code, globalnames, globalsns, builtinsns) < 0)
{
return NULL;
}
Py_RETURN_NONE;
}
static PyObject *
jit_enabled(PyObject *self, PyObject *arg)
{
@ -2293,6 +2335,8 @@ static PyMethodDef module_functions[] = {
{"get_co_localskinds", get_co_localskinds, METH_O, NULL},
{"get_code_var_counts", _PyCFunction_CAST(get_code_var_counts),
METH_VARARGS | METH_KEYWORDS, NULL},
{"verify_stateless_code", _PyCFunction_CAST(verify_stateless_code),
METH_VARARGS | METH_KEYWORDS, NULL},
{"jit_enabled", jit_enabled, METH_NOARGS, NULL},
#ifdef _Py_TIER2
{"add_executor_dependency", add_executor_dependency, METH_VARARGS, NULL},