Staging
v0.8.1
v0.8.1
swh:1:snp:635f4099902912592851108bcac178ff574f7c5f
Tip revision: 1da43e5e916949c8e849e656d9d05fa4b9d6836c authored by Benjamin Peterson on 26 June 2009, 13:21:52 UTC
rearrange the sections of the README, so they'll hopefully be more in the order people will interested in
rearrange the sections of the README, so they'll hopefully be more in the order people will interested in
Tip revision: 1da43e5
testcapi_long.h
/* Poor-man's template. Macros used:
TESTNAME name of the test (like test_long_api_inner)
TYPENAME the signed type (like long)
F_S_TO_PY convert signed to pylong; TYPENAME -> PyObject*
F_PY_TO_S convert pylong to signed; PyObject* -> TYPENAME
F_U_TO_PY convert unsigned to pylong; unsigned TYPENAME -> PyObject*
F_PY_TO_U convert pylong to unsigned; PyObject* -> unsigned TYPENAME
*/
static PyObject *
TESTNAME(PyObject *error(const char*))
{
const int NBITS = sizeof(TYPENAME) * 8;
unsigned TYPENAME base;
PyObject *pyresult;
int i;
/* Note: This test lets PyObjects leak if an error is raised. Since
an error should never be raised, leaks are impossible <wink>. */
/* Test native -> PyLong -> native roundtrip identity.
* Generate all powers of 2, and test them and their negations,
* plus the numbers +-1 off from them.
*/
base = 1;
for (i = 0;
i < NBITS + 1; /* on last, base overflows to 0 */
++i, base <<= 1)
{
int j;
for (j = 0; j < 6; ++j) {
TYPENAME in, out;
unsigned TYPENAME uin, uout;
/* For 0, 1, 2 use base; for 3, 4, 5 use -base */
uin = j < 3 ? base
: (unsigned TYPENAME)(-(TYPENAME)base);
/* For 0 & 3, subtract 1.
* For 1 & 4, leave alone.
* For 2 & 5, add 1.
*/
uin += (unsigned TYPENAME)(TYPENAME)(j % 3 - 1);
pyresult = F_U_TO_PY(uin);
if (pyresult == NULL)
return error(
"unsigned unexpected null result");
uout = F_PY_TO_U(pyresult);
if (uout == (unsigned TYPENAME)-1 && PyErr_Occurred())
return error(
"unsigned unexpected -1 result");
if (uout != uin)
return error(
"unsigned output != input");
UNBIND(pyresult);
in = (TYPENAME)uin;
pyresult = F_S_TO_PY(in);
if (pyresult == NULL)
return error(
"signed unexpected null result");
out = F_PY_TO_S(pyresult);
if (out == (TYPENAME)-1 && PyErr_Occurred())
return error(
"signed unexpected -1 result");
if (out != in)
return error(
"signed output != input");
UNBIND(pyresult);
}
}
/* Overflow tests. The loop above ensured that all limit cases that
* should not overflow don't overflow, so all we need to do here is
* provoke one-over-the-limit cases (not exhaustive, but sharp).
*/
{
PyObject *one, *x, *y;
TYPENAME out;
unsigned TYPENAME uout;
one = PyLong_FromLong(1);
if (one == NULL)
return error(
"unexpected NULL from PyLong_FromLong");
/* Unsigned complains about -1? */
x = PyNumber_Negative(one);
if (x == NULL)
return error(
"unexpected NULL from PyNumber_Negative");
uout = F_PY_TO_U(x);
if (uout != (unsigned TYPENAME)-1 || !PyErr_Occurred())
return error(
"PyLong_AsUnsignedXXX(-1) didn't complain");
if (!PyErr_ExceptionMatches(PyExc_OverflowError))
return error(
"PyLong_AsUnsignedXXX(-1) raised "
"something other than OverflowError");
PyErr_Clear();
UNBIND(x);
/* Unsigned complains about 2**NBITS? */
y = PyLong_FromLong((long)NBITS);
if (y == NULL)
return error(
"unexpected NULL from PyLong_FromLong");
x = PyNumber_Lshift(one, y); /* 1L << NBITS, == 2**NBITS */
UNBIND(y);
if (x == NULL)
return error(
"unexpected NULL from PyNumber_Lshift");
uout = F_PY_TO_U(x);
if (uout != (unsigned TYPENAME)-1 || !PyErr_Occurred())
return error(
"PyLong_AsUnsignedXXX(2**NBITS) didn't "
"complain");
if (!PyErr_ExceptionMatches(PyExc_OverflowError))
return error(
"PyLong_AsUnsignedXXX(2**NBITS) raised "
"something other than OverflowError");
PyErr_Clear();
/* Signed complains about 2**(NBITS-1)?
x still has 2**NBITS. */
y = PyNumber_Rshift(x, one); /* 2**(NBITS-1) */
UNBIND(x);
if (y == NULL)
return error(
"unexpected NULL from PyNumber_Rshift");
out = F_PY_TO_S(y);
if (out != (TYPENAME)-1 || !PyErr_Occurred())
return error(
"PyLong_AsXXX(2**(NBITS-1)) didn't "
"complain");
if (!PyErr_ExceptionMatches(PyExc_OverflowError))
return error(
"PyLong_AsXXX(2**(NBITS-1)) raised "
"something other than OverflowError");
PyErr_Clear();
/* Signed complains about -2**(NBITS-1)-1?;
y still has 2**(NBITS-1). */
x = PyNumber_Negative(y); /* -(2**(NBITS-1)) */
UNBIND(y);
if (x == NULL)
return error(
"unexpected NULL from PyNumber_Negative");
y = PyNumber_Subtract(x, one); /* -(2**(NBITS-1))-1 */
UNBIND(x);
if (y == NULL)
return error(
"unexpected NULL from PyNumber_Subtract");
out = F_PY_TO_S(y);
if (out != (TYPENAME)-1 || !PyErr_Occurred())
return error(
"PyLong_AsXXX(-2**(NBITS-1)-1) didn't "
"complain");
if (!PyErr_ExceptionMatches(PyExc_OverflowError))
return error(
"PyLong_AsXXX(-2**(NBITS-1)-1) raised "
"something other than OverflowError");
PyErr_Clear();
UNBIND(y);
Py_XDECREF(x);
Py_XDECREF(y);
Py_DECREF(one);
}
Py_INCREF(Py_None);
return Py_None;
}