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gh-117139: Fix a few wrong steals in bytecodes.c #121127

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Merged
Fidget-Spinner merged 1 commit into from
Jun 28, 2024
Merged

gh-117139: Fix a few wrong steals in bytecodes.c #121127

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16 changes: 8 additions & 8 deletions 16 Python/bytecodes.c
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Original file line number Diff line number Diff line change
Expand Up @@ -230,7 +230,7 @@ dummy_func(
}

replicate(8) pure inst(LOAD_FAST, (-- value)) {
assert(PyStackRef_AsPyObjectBorrow(GETLOCAL(oparg)) != NULL);
assert(!PyStackRef_IsNull(GETLOCAL(oparg)));
value = PyStackRef_DUP(GETLOCAL(oparg));
}

Expand Down Expand Up @@ -673,7 +673,7 @@ dummy_func(
err = 1;
}
else {
err = PyObject_SetItem(PyStackRef_AsPyObjectBorrow(container), slice, PyStackRef_AsPyObjectSteal(v));
err = PyObject_SetItem(PyStackRef_AsPyObjectBorrow(container), slice, PyStackRef_AsPyObjectBorrow(v));

@Fidget-Spinner Fidget-Spinner Jun 28, 2024

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PyObject_SetItem and the entire family actually takes borrowed references to the container and item. So this steal is wrong, it should be borrow.

This was caught when the PyStackRef_CLOSE(v) below tried to close an already invalid stackref (it was made invalid by the steal).

Py_DECREF(slice);
}
PyStackRef_CLOSE(v);
Expand Down Expand Up @@ -789,7 +789,7 @@ dummy_func(

inst(SET_ADD, (set, unused[oparg-1], v -- set, unused[oparg-1])) {
int err = PySet_Add(PyStackRef_AsPyObjectBorrow(set),
PyStackRef_AsPyObjectSteal(v));
PyStackRef_AsPyObjectBorrow(v));

@Fidget-Spinner Fidget-Spinner Jun 28, 2024

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Same for PySet_Add

DECREF_INPUTS();
ERROR_IF(err, error);
}
Expand All @@ -813,7 +813,7 @@ dummy_func(

op(_STORE_SUBSCR, (v, container, sub -- )) {
/* container[sub] = v */
int err = PyObject_SetItem(PyStackRef_AsPyObjectBorrow(container), PyStackRef_AsPyObjectSteal(sub), PyStackRef_AsPyObjectSteal(v));
int err = PyObject_SetItem(PyStackRef_AsPyObjectBorrow(container), PyStackRef_AsPyObjectBorrow(sub), PyStackRef_AsPyObjectBorrow(v));
DECREF_INPUTS();
ERROR_IF(err, error);
}
Expand Down Expand Up @@ -1235,7 +1235,7 @@ dummy_func(
inst(POP_EXCEPT, (exc_value -- )) {
_PyErr_StackItem *exc_info = tstate->exc_info;
Py_XSETREF(exc_info->exc_value,
PyStackRef_AsPyObjectBorrow(exc_value) == Py_None
PyStackRef_Is(exc_value, PyStackRef_None)
? NULL : PyStackRef_AsPyObjectSteal(exc_value));
}

Expand Down Expand Up @@ -1330,9 +1330,9 @@ dummy_func(
ERROR_IF(true, error);
}
if (PyDict_CheckExact(ns))
err = PyDict_SetItem(ns, name, PyStackRef_AsPyObjectSteal(v));
err = PyDict_SetItem(ns, name, PyStackRef_AsPyObjectBorrow(v));
else
err = PyObject_SetItem(ns, name, PyStackRef_AsPyObjectSteal(v));
err = PyObject_SetItem(ns, name, PyStackRef_AsPyObjectBorrow(v));
DECREF_INPUTS();
ERROR_IF(err, error);
}
Expand Down Expand Up @@ -1450,7 +1450,7 @@ dummy_func(
op(_STORE_ATTR, (v, owner --)) {
PyObject *name = GETITEM(FRAME_CO_NAMES, oparg);
int err = PyObject_SetAttr(PyStackRef_AsPyObjectBorrow(owner),
name, PyStackRef_AsPyObjectSteal(v));
name, PyStackRef_AsPyObjectBorrow(v));

@Fidget-Spinner Fidget-Spinner Jun 28, 2024 •
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PyObject_SetAttr actually takes borrowed refs too, so this shouldn't be stolen. This was caught when the DECREF_INPUTS tried to close an already stolen stackref.

DECREF_INPUTS();
ERROR_IF(err, error);
}
Expand Down
2 changes: 1 addition & 1 deletion 2 Python/ceval.c
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Expand Up @@ -1619,7 +1619,7 @@ initialize_locals(PyThreadState *tstate, PyFunctionObject *func,
goto kw_fail;
}

if (PyDict_SetItem(kwdict, keyword, PyStackRef_AsPyObjectSteal(value_stackref)) == -1) {
if (PyDict_SetItem(kwdict, keyword, PyStackRef_AsPyObjectBorrow(value_stackref)) == -1) {
goto kw_fail;
}
PyStackRef_CLOSE(value_stackref);
Expand Down
32 changes: 16 additions & 16 deletions 32 Python/executor_cases.c.h
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16 changes: 8 additions & 8 deletions 16 Python/generated_cases.c.h
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