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Merged revisions 79843-79844 via svnmerge from 

svn+ssh://pythondev@svn.python.org/python/trunk

........
  r79843 | mark.dickinson | 2010-04-06 17:46:09 +0100 (Tue, 06 Apr 2010) | 4 lines

  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.
........
  r79844 | mark.dickinson | 2010-04-06 17:47:55 +0100 (Tue, 06 Apr 2010) | 1 line

  Misc/NEWS entry for r79843.
........
This commit is contained in:
Mark Dickinson 2010-04-06 16:53:17 +00:00
parent f96b78437b
commit 3318d29d22
2 changed files with 10 additions and 14 deletions
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4
Misc/NEWS
View File

@ -12,6 +12,10 @@ What's New in Python 3.2 Alpha 1?
Core and Builtins
-----------------
- Issue #8259: 1L << (2**31) no longer produces an 'outrageous shift error'
on 64-bit machines. The shift count for either left or right shift is
permitted to be up to sys.maxsize.
- Ensure that tokenization of identifiers is not affected by locale.
- Issue #1222585: Added LDCXXSHARED for C++ support. Patch by Arfrever.

20
Objects/longobject.c
View File

@ -3779,8 +3779,7 @@ static PyObject *
long_rshift(PyLongObject *a, PyLongObject *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;
CHECK_BINOP(a, b);
@ -3799,8 +3798,7 @@ long_rshift(PyLongObject *a, PyLongObject *b)
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) {
@ -3841,27 +3839,21 @@ long_lshift(PyObject *v, PyObject *w)
PyLongObject *a = (PyLongObject*)v;
PyLongObject *b = (PyLongObject*)w;
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;
CHECK_BINOP(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(Py_SIZE(a));
newsize = oldsize + wordshift;