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gh-125323: Remove some unsafe stackref decrefs by Fidget-Spinner · Pull Request #125324 · python/cpython · GitHub

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gh-125323: Remove some unsafe stackref decrefs #125324

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Merged
markshannon merged 3 commits into from
Oct 14, 2024
Conversation 6 Commits 3 Checks 0 Files changed
Merged

gh-125323: Remove some unsafe stackref decrefs #125324

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3c52e5c
Fix unsafe stackref decrefs
Fidget-Spinner Oct 11, 2024
e128941
Use close specialized
Fidget-Spinner Oct 12, 2024
8278d07
regen cases
Fidget-Spinner Oct 12, 2024
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3 changes: 3 additions & 0 deletions Include/internal/pycore_stackref.h
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Original file line number Diff line number Diff line change
Expand Up @@ -153,6 +153,8 @@ PyStackRef_AsStrongReference(_PyStackRef stackref)
return PyStackRef_FromPyObjectSteal(PyStackRef_AsPyObjectSteal(stackref));
}

#define PyStackRef_CLOSE_SPECIALIZED(stackref, dealloc) PyStackRef_CLOSE(stackref)


#else // Py_GIL_DISABLED

Expand All @@ -177,6 +179,7 @@ static const _PyStackRef PyStackRef_NULL = { .bits = 0 };

#define PyStackRef_DUP(stackref) PyStackRef_FromPyObjectSteal(Py_NewRef(PyStackRef_AsPyObjectBorrow(stackref)))

#define PyStackRef_CLOSE_SPECIALIZED(stackref, dealloc) _Py_DECREF_SPECIALIZED(PyStackRef_AsPyObjectBorrow(stackref), dealloc)

#endif // Py_GIL_DISABLED

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40 changes: 20 additions & 20 deletions Python/bytecodes.c
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Original file line number Diff line number Diff line change
Expand Up @@ -474,8 +474,8 @@ dummy_func(

STAT_INC(BINARY_OP, hit);
PyObject *res_o = _PyLong_Multiply((PyLongObject *)left_o, (PyLongObject *)right_o);
_Py_DECREF_SPECIALIZED(right_o, (destructor)PyObject_Free);
_Py_DECREF_SPECIALIZED(left_o, (destructor)PyObject_Free);
PyStackRef_CLOSE_SPECIALIZED(right, (destructor)PyObject_Free);
PyStackRef_CLOSE_SPECIALIZED(left, (destructor)PyObject_Free);
INPUTS_DEAD();
ERROR_IF(res_o == NULL, error);
res = PyStackRef_FromPyObjectSteal(res_o);
Expand All @@ -487,8 +487,8 @@ dummy_func(

STAT_INC(BINARY_OP, hit);
PyObject *res_o = _PyLong_Add((PyLongObject *)left_o, (PyLongObject *)right_o);
_Py_DECREF_SPECIALIZED(right_o, (destructor)PyObject_Free);
_Py_DECREF_SPECIALIZED(left_o, (destructor)PyObject_Free);
PyStackRef_CLOSE_SPECIALIZED(right, (destructor)PyObject_Free);
PyStackRef_CLOSE_SPECIALIZED(left, (destructor)PyObject_Free);
INPUTS_DEAD();
ERROR_IF(res_o == NULL, error);
res = PyStackRef_FromPyObjectSteal(res_o);
Expand All @@ -500,8 +500,8 @@ dummy_func(

STAT_INC(BINARY_OP, hit);
PyObject *res_o = _PyLong_Subtract((PyLongObject *)left_o, (PyLongObject *)right_o);
_Py_DECREF_SPECIALIZED(right_o, (destructor)PyObject_Free);
_Py_DECREF_SPECIALIZED(left_o, (destructor)PyObject_Free);
PyStackRef_CLOSE_SPECIALIZED(right, (destructor)PyObject_Free);
PyStackRef_CLOSE_SPECIALIZED(left, (destructor)PyObject_Free);
INPUTS_DEAD();
ERROR_IF(res_o == NULL, error);
res = PyStackRef_FromPyObjectSteal(res_o);
Expand Down Expand Up @@ -594,8 +594,8 @@ dummy_func(

STAT_INC(BINARY_OP, hit);
PyObject *res_o = PyUnicode_Concat(left_o, right_o);
_Py_DECREF_SPECIALIZED(left_o, _PyUnicode_ExactDealloc);
_Py_DECREF_SPECIALIZED(right_o, _PyUnicode_ExactDealloc);
PyStackRef_CLOSE_SPECIALIZED(left, _PyUnicode_ExactDealloc);
PyStackRef_CLOSE_SPECIALIZED(right, _PyUnicode_ExactDealloc);
INPUTS_DEAD();
ERROR_IF(res_o == NULL, error);
res = PyStackRef_FromPyObjectSteal(res_o);
Expand Down Expand Up @@ -636,12 +636,12 @@ dummy_func(
* that the string is safe to mutate.
*/
assert(Py_REFCNT(left_o) >= 2);
_Py_DECREF_NO_DEALLOC(left_o);
PyStackRef_CLOSE(left);
DEAD(left);
PyObject *temp = PyStackRef_AsPyObjectBorrow(*target_local);
PyUnicode_Append(&temp, right_o);
*target_local = PyStackRef_FromPyObjectSteal(temp);
_Py_DECREF_SPECIALIZED(right_o, _PyUnicode_ExactDealloc);
PyStackRef_CLOSE_SPECIALIZED(right, _PyUnicode_ExactDealloc);
DEAD(right);
ERROR_IF(PyStackRef_IsNull(*target_local), error);
#if TIER_ONE
Expand Down Expand Up @@ -755,7 +755,7 @@ dummy_func(
PyObject *res_o = PyList_GET_ITEM(list, index);
assert(res_o != NULL);
Py_INCREF(res_o);
_Py_DECREF_SPECIALIZED(sub, (destructor)PyObject_Free);
PyStackRef_CLOSE_SPECIALIZED(sub_st, (destructor)PyObject_Free);
DEAD(sub_st);
PyStackRef_CLOSE(list_st);
res = PyStackRef_FromPyObjectSteal(res_o);
Expand All @@ -775,7 +775,7 @@ dummy_func(
DEOPT_IF(Py_ARRAY_LENGTH(_Py_SINGLETON(strings).ascii) <= c);
STAT_INC(BINARY_SUBSCR, hit);
PyObject *res_o = (PyObject*)&_Py_SINGLETON(strings).ascii[c];
_Py_DECREF_SPECIALIZED(sub, (destructor)PyObject_Free);
PyStackRef_CLOSE_SPECIALIZED(sub_st, (destructor)PyObject_Free);
DEAD(sub_st);
PyStackRef_CLOSE(str_st);
res = PyStackRef_FromPyObjectSteal(res_o);
Expand All @@ -796,7 +796,7 @@ dummy_func(
PyObject *res_o = PyTuple_GET_ITEM(tuple, index);
assert(res_o != NULL);
Py_INCREF(res_o);
_Py_DECREF_SPECIALIZED(sub, (destructor)PyObject_Free);
PyStackRef_CLOSE_SPECIALIZED(sub_st, (destructor)PyObject_Free);
DEAD(sub_st);
PyStackRef_CLOSE(tuple_st);
res = PyStackRef_FromPyObjectSteal(res_o);
Expand Down Expand Up @@ -908,7 +908,7 @@ dummy_func(
PyList_SET_ITEM(list, index, PyStackRef_AsPyObjectSteal(value));
assert(old_value != NULL);
Py_DECREF(old_value);
_Py_DECREF_SPECIALIZED(sub, (destructor)PyObject_Free);
PyStackRef_CLOSE_SPECIALIZED(sub_st, (destructor)PyObject_Free);
DEAD(sub_st);
PyStackRef_CLOSE(list_st);
}
Expand Down Expand Up @@ -2398,9 +2398,9 @@ dummy_func(
double dright = PyFloat_AS_DOUBLE(right_o);
// 1 if NaN, 2 if <, 4 if >, 8 if ==; this matches low four bits of the oparg
int sign_ish = COMPARISON_BIT(dleft, dright);
_Py_DECREF_SPECIALIZED(left_o, _PyFloat_ExactDealloc);
PyStackRef_CLOSE_SPECIALIZED(left, _PyFloat_ExactDealloc);
DEAD(left);
_Py_DECREF_SPECIALIZED(right_o, _PyFloat_ExactDealloc);
PyStackRef_CLOSE_SPECIALIZED(right, _PyFloat_ExactDealloc);
DEAD(right);
res = (sign_ish & oparg) ? PyStackRef_True : PyStackRef_False;
// It's always a bool, so we don't care about oparg & 16.
Expand All @@ -2420,9 +2420,9 @@ dummy_func(
Py_ssize_t iright = _PyLong_CompactValue((PyLongObject *)right_o);
// 2 if <, 4 if >, 8 if ==; this matches the low 4 bits of the oparg
int sign_ish = COMPARISON_BIT(ileft, iright);
_Py_DECREF_SPECIALIZED(left_o, (destructor)PyObject_Free);
PyStackRef_CLOSE_SPECIALIZED(left, (destructor)PyObject_Free);
DEAD(left);
_Py_DECREF_SPECIALIZED(right_o, (destructor)PyObject_Free);
PyStackRef_CLOSE_SPECIALIZED(right, (destructor)PyObject_Free);
DEAD(right);
res = (sign_ish & oparg) ? PyStackRef_True : PyStackRef_False;
// It's always a bool, so we don't care about oparg & 16.
Expand All @@ -2436,9 +2436,9 @@ dummy_func(
STAT_INC(COMPARE_OP, hit);
int eq = _PyUnicode_Equal(left_o, right_o);
assert((oparg >> 5) == Py_EQ || (oparg >> 5) == Py_NE);
_Py_DECREF_SPECIALIZED(left_o, _PyUnicode_ExactDealloc);
PyStackRef_CLOSE_SPECIALIZED(left, _PyUnicode_ExactDealloc);
DEAD(left);
_Py_DECREF_SPECIALIZED(right_o, _PyUnicode_ExactDealloc);
PyStackRef_CLOSE_SPECIALIZED(right, _PyUnicode_ExactDealloc);
DEAD(right);
assert(eq == 0 || eq == 1);
assert((oparg & 0xf) == COMPARISON_NOT_EQUALS || (oparg & 0xf) == COMPARISON_EQUALS);
Expand Down
40 changes: 20 additions & 20 deletions Python/executor_cases.c.h
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