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-rw-r--r--Doc/c-api/long.rst11
-rw-r--r--Modules/_testcapimodule.c167
-rw-r--r--Objects/longobject.c19
3 files changed, 184 insertions, 13 deletions
diff --git a/Doc/c-api/long.rst b/Doc/c-api/long.rst
index 19d65b8..083fe8b 100644
--- a/Doc/c-api/long.rst
+++ b/Doc/c-api/long.rst
@@ -121,10 +121,13 @@ All integers are implemented as "long" integer objects of arbitrary size.
.. cfunction:: long PyLong_AsLongAndOverflow(PyObject *pylong, int* overflow)
- Return a C :ctype:`long` representation of the contents of *pylong*. If
- *pylong* is greater than :const:`LONG_MAX`, return -1 and
- set `*overflow` to 1 (for overflow) or -1 (for underflow).
- If an exception is set because of type errors, also return -1.
+ Return a C :ctype:`long` representation of the contents of
+ *pylong*. If *pylong* is greater than :const:`LONG_MAX` or less
+ than :const:`LONG_MIN`, set `*overflow` to ``1`` or ``-1``,
+ respectively, and return ``-1``; otherwise, set `*overflow` to
+ ``0``. If any other exception occurs (for example a TypeError or
+ MemoryError), then ``-1`` will be returned and ``*overflow`` will
+ be ``0``.
.. cfunction:: Py_ssize_t PyLong_AsSsize_t(PyObject *pylong)
diff --git a/Modules/_testcapimodule.c b/Modules/_testcapimodule.c
index 70da707..e549151 100644
--- a/Modules/_testcapimodule.c
+++ b/Modules/_testcapimodule.c
@@ -359,6 +359,171 @@ test_longlong_api(PyObject* self, PyObject *args)
#undef F_U_TO_PY
#undef F_PY_TO_U
+/* Test the PyLong_AsLongAndOverflow API. General conversion to PY_LONG
+ is tested by test_long_api_inner. This test will concentrate on proper
+ handling of overflow.
+*/
+
+static PyObject *
+test_long_and_overflow(PyObject *self)
+{
+ PyObject *num, *one, *temp;
+ long value;
+ int overflow;
+
+ /* Test that overflow is set properly for a large value. */
+ /* num is a number larger than LONG_MAX even on 64-bit platforms */
+ num = PyLong_FromString("FFFFFFFFFFFFFFFFFFFFFFFF", NULL, 16);
+ if (num == NULL)
+ return NULL;
+ overflow = 1234;
+ value = PyLong_AsLongAndOverflow(num, &overflow);
+ Py_DECREF(num);
+ if (value == -1 && PyErr_Occurred())
+ return NULL;
+ if (value != -1)
+ return raiseTestError("test_long_and_overflow",
+ "return value was not set to -1");
+ if (overflow != 1)
+ return raiseTestError("test_long_and_overflow",
+ "overflow was not set to 1");
+
+ /* Same again, with num = LONG_MAX + 1 */
+ num = PyLong_FromLong(LONG_MAX);
+ if (num == NULL)
+ return NULL;
+ one = PyLong_FromLong(1L);
+ if (one == NULL) {
+ Py_DECREF(num);
+ return NULL;
+ }
+ temp = PyNumber_Add(num, one);
+ Py_DECREF(one);
+ Py_DECREF(num);
+ num = temp;
+ if (num == NULL)
+ return NULL;
+ overflow = 0;
+ value = PyLong_AsLongAndOverflow(num, &overflow);
+ Py_DECREF(num);
+ if (value == -1 && PyErr_Occurred())
+ return NULL;
+ if (value != -1)
+ return raiseTestError("test_long_and_overflow",
+ "return value was not set to -1");
+ if (overflow != 1)
+ return raiseTestError("test_long_and_overflow",
+ "overflow was not set to 1");
+
+ /* Test that overflow is set properly for a large negative value. */
+ /* num is a number smaller than LONG_MIN even on 64-bit platforms */
+ num = PyLong_FromString("-FFFFFFFFFFFFFFFFFFFFFFFF", NULL, 16);
+ if (num == NULL)
+ return NULL;
+ overflow = 1234;
+ value = PyLong_AsLongAndOverflow(num, &overflow);
+ Py_DECREF(num);
+ if (value == -1 && PyErr_Occurred())
+ return NULL;
+ if (value != -1)
+ return raiseTestError("test_long_and_overflow",
+ "return value was not set to -1");
+ if (overflow != -1)
+ return raiseTestError("test_long_and_overflow",
+ "overflow was not set to -1");
+
+ /* Same again, with num = LONG_MIN - 1 */
+ num = PyLong_FromLong(LONG_MIN);
+ if (num == NULL)
+ return NULL;
+ one = PyLong_FromLong(1L);
+ if (one == NULL) {
+ Py_DECREF(num);
+ return NULL;
+ }
+ temp = PyNumber_Subtract(num, one);
+ Py_DECREF(one);
+ Py_DECREF(num);
+ num = temp;
+ if (num == NULL)
+ return NULL;
+ overflow = 0;
+ value = PyLong_AsLongAndOverflow(num, &overflow);
+ Py_DECREF(num);
+ if (value == -1 && PyErr_Occurred())
+ return NULL;
+ if (value != -1)
+ return raiseTestError("test_long_and_overflow",
+ "return value was not set to -1");
+ if (overflow != -1)
+ return raiseTestError("test_long_and_overflow",
+ "overflow was not set to -1");
+
+ /* Test that overflow is cleared properly for small values. */
+ num = PyLong_FromString("FF", NULL, 16);
+ if (num == NULL)
+ return NULL;
+ overflow = 1234;
+ value = PyLong_AsLongAndOverflow(num, &overflow);
+ Py_DECREF(num);
+ if (value == -1 && PyErr_Occurred())
+ return NULL;
+ if (value != 0xFF)
+ return raiseTestError("test_long_and_overflow",
+ "expected return value 0xFF");
+ if (overflow != 0)
+ return raiseTestError("test_long_and_overflow",
+ "overflow was not cleared");
+
+ num = PyLong_FromString("-FF", NULL, 16);
+ if (num == NULL)
+ return NULL;
+ overflow = 0;
+ value = PyLong_AsLongAndOverflow(num, &overflow);
+ Py_DECREF(num);
+ if (value == -1 && PyErr_Occurred())
+ return NULL;
+ if (value != -0xFF)
+ return raiseTestError("test_long_and_overflow",
+ "expected return value 0xFF");
+ if (overflow != 0)
+ return raiseTestError("test_long_and_overflow",
+ "overflow was set incorrectly");
+
+ num = PyLong_FromLong(LONG_MAX);
+ if (num == NULL)
+ return NULL;
+ overflow = 1234;
+ value = PyLong_AsLongAndOverflow(num, &overflow);
+ Py_DECREF(num);
+ if (value == -1 && PyErr_Occurred())
+ return NULL;
+ if (value != LONG_MAX)
+ return raiseTestError("test_long_and_overflow",
+ "expected return value LONG_MAX");
+ if (overflow != 0)
+ return raiseTestError("test_long_and_overflow",
+ "overflow was not cleared");
+
+ num = PyLong_FromLong(LONG_MIN);
+ if (num == NULL)
+ return NULL;
+ overflow = 0;
+ value = PyLong_AsLongAndOverflow(num, &overflow);
+ Py_DECREF(num);
+ if (value == -1 && PyErr_Occurred())
+ return NULL;
+ if (value != LONG_MIN)
+ return raiseTestError("test_long_and_overflow",
+ "expected return value LONG_MIN");
+ if (overflow != 0)
+ return raiseTestError("test_long_and_overflow",
+ "overflow was not cleared");
+
+ Py_INCREF(Py_None);
+ return Py_None;
+}
+
/* Test the L code for PyArg_ParseTuple. This should deliver a PY_LONG_LONG
for both long and int arguments. The test may leak a little memory if
it fails.
@@ -1560,6 +1725,8 @@ static PyMethodDef TestMethods[] = {
{"test_dict_iteration", (PyCFunction)test_dict_iteration,METH_NOARGS},
{"test_lazy_hash_inheritance", (PyCFunction)test_lazy_hash_inheritance,METH_NOARGS},
{"test_long_api", (PyCFunction)test_long_api, METH_NOARGS},
+ {"test_long_and_overflow", (PyCFunction)test_long_and_overflow,
+ METH_NOARGS},
{"test_long_numbits", (PyCFunction)test_long_numbits, METH_NOARGS},
{"test_k_code", (PyCFunction)test_k_code, METH_NOARGS},
{"test_empty_argparse", (PyCFunction)test_empty_argparse,METH_NOARGS},
diff --git a/Objects/longobject.c b/Objects/longobject.c
index b46ce4e..8e4093c 100644
--- a/Objects/longobject.c
+++ b/Objects/longobject.c
@@ -346,9 +346,10 @@ PyLong_AsLongAndOverflow(PyObject *vv, int *overflow)
if (!PyLong_Check(vv)) {
PyNumberMethods *nb;
- if ((nb = vv->ob_type->tp_as_number) == NULL ||
- nb->nb_int == NULL) {
- PyErr_SetString(PyExc_TypeError, "an integer is required");
+ nb = vv->ob_type->tp_as_number;
+ if (nb == NULL || nb->nb_int == NULL) {
+ PyErr_SetString(PyExc_TypeError,
+ "an integer is required");
return -1;
}
vv = (*nb->nb_int) (vv);
@@ -388,13 +389,13 @@ PyLong_AsLongAndOverflow(PyObject *vv, int *overflow)
prev = x;
x = (x << PyLong_SHIFT) | v->ob_digit[i];
if ((x >> PyLong_SHIFT) != prev) {
- *overflow = Py_SIZE(v) > 0 ? 1 : -1;
+ *overflow = sign;
goto exit;
}
}
- /* Haven't lost any bits, but casting to long requires extra care
- * (see comment above).
- */
+ /* Haven't lost any bits, but casting to long requires extra
+ * care (see comment above).
+ */
if (x <= (unsigned long)LONG_MAX) {
res = (long)x * sign;
}
@@ -402,9 +403,9 @@ PyLong_AsLongAndOverflow(PyObject *vv, int *overflow)
res = LONG_MIN;
}
else {
- *overflow = Py_SIZE(v) > 0 ? 1 : -1;
+ *overflow = sign;
/* res is already set to -1 */
- }
+ }
}
exit:
if (do_decref) {
generated by cgit v0.12 at 2024-11-19 16:33:27 (GMT)