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Issue #8259: Get rid of 'outrageous left shift count' error when 

left-shifting an integer by more than 2**31 on a 64-bit machine.  Also
convert shift counts to a Py_ssize_t instead of a C long.
This commit is contained in:
Mark Dickinson 2010-04-06 16:46:09 +00:00
parent 72ec2e2bdf
commit 3ec9b942b5
1 changed files with 6 additions and 14 deletions
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20
Objects/longobject.c
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@ -3614,8 +3614,7 @@ long_rshift(PyLongObject *v, PyLongObject *w)
{
PyLongObject *a, *b;
PyLongObject *z = NULL;
long shiftby;
Py_ssize_t newsize, wordshift, loshift, hishift, i, j;
Py_ssize_t shiftby, newsize, wordshift, loshift, hishift, i, j;
digit lomask, himask;
CONVERT_BINOP((PyObject *)v, (PyObject *)w, &a, &b);
@ -3634,8 +3633,7 @@ long_rshift(PyLongObject *v, PyLongObject *w)
Py_DECREF(a2);
}
else {
shiftby = PyLong_AsLong((PyObject *)b);
shiftby = PyLong_AsSsize_t((PyObject *)b);
if (shiftby == -1L && PyErr_Occurred())
goto rshift_error;
if (shiftby < 0) {
@ -3681,27 +3679,21 @@ long_lshift(PyObject *v, PyObject *w)
/* This version due to Tim Peters */
PyLongObject *a, *b;
PyLongObject *z = NULL;
long shiftby;
Py_ssize_t oldsize, newsize, wordshift, remshift, i, j;
Py_ssize_t shiftby, oldsize, newsize, wordshift, remshift, i, j;
twodigits accum;
CONVERT_BINOP(v, w, &a, &b);
shiftby = PyLong_AsLong((PyObject *)b);
shiftby = PyLong_AsSsize_t((PyObject *)b);
if (shiftby == -1L && PyErr_Occurred())
goto lshift_error;
if (shiftby < 0) {
PyErr_SetString(PyExc_ValueError, "negative shift count");
goto lshift_error;
}
if ((long)(int)shiftby != shiftby) {
PyErr_SetString(PyExc_ValueError,
"outrageous left shift count");
goto lshift_error;
}
/* wordshift, remshift = divmod(shiftby, PyLong_SHIFT) */
wordshift = (int)shiftby / PyLong_SHIFT;
remshift = (int)shiftby - wordshift * PyLong_SHIFT;
wordshift = shiftby / PyLong_SHIFT;
remshift = shiftby - wordshift * PyLong_SHIFT;
oldsize = ABS(a->ob_size);
newsize = oldsize + wordshift;