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author | Armin Rigo <arigo@tunes.org> | 2006-10-04 12:17:45 +0000 |
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committer | Armin Rigo <arigo@tunes.org> | 2006-10-04 12:17:45 +0000 |
commit | b7e7c5c59135a809f20ff3fa43693212a482f77c (patch) | |
tree | 648132f9483e77768a626370315d91432be2ea62 /Lib/test/test_long.py | |
parent | 48adc0c998c826c00bda04c950dd240842151a9b (diff) | |
download | cpython-b7e7c5c59135a809f20ff3fa43693212a482f77c.tar.gz |
Forward-port of r52136,52138: a review of overflow-detecting code.
* unified the way intobject, longobject and mystrtoul handle
values around -sys.maxint-1.
* in general, trying to entierely avoid overflows in any computation
involving signed ints or longs is extremely involved. Fixed a few
simple cases where a compiler might be too clever (but that's all
guesswork).
* more overflow checks against bad data in marshal.c.
* 2.5 specific: fixed a number of places that were still confusing int
and Py_ssize_t. Some of them could potentially have caused
"real-world" breakage.
* list.pop(x): fixing overflow issues on x was messy. I just reverted
to PyArg_ParseTuple("n"), which does the right thing. (An obscure
test was trying to give a Decimal to list.pop()... doesn't make
sense any more IMHO)
* trying to write a few tests...
Diffstat (limited to 'Lib/test/test_long.py')
-rw-r--r-- | Lib/test/test_long.py | 23 |
1 files changed, 20 insertions, 3 deletions
diff --git a/Lib/test/test_long.py b/Lib/test/test_long.py index 7b0c7b0798..ae132adad9 100644 --- a/Lib/test/test_long.py +++ b/Lib/test/test_long.py @@ -247,17 +247,23 @@ class LongTest(unittest.TestCase): "long(-sys.maxint-1) != -sys.maxint-1") # long -> int should not fail for hugepos_aslong or hugeneg_aslong + x = int(hugepos_aslong) try: - self.assertEqual(int(hugepos_aslong), hugepos, + self.assertEqual(x, hugepos, "converting sys.maxint to long and back to int fails") except OverflowError: self.fail("int(long(sys.maxint)) overflowed!") + if not isinstance(x, int): + raise TestFailed("int(long(sys.maxint)) should have returned int") + x = int(hugeneg_aslong) try: - self.assertEqual(int(hugeneg_aslong), hugeneg, + self.assertEqual(x, hugeneg, "converting -sys.maxint-1 to long and back to int fails") except OverflowError: self.fail("int(long(-sys.maxint-1)) overflowed!") - + if not isinstance(x, int): + raise TestFailed("int(long(-sys.maxint-1)) should have " + "returned int") # but long -> int should overflow for hugepos+1 and hugeneg-1 x = hugepos_aslong + 1 try: @@ -282,6 +288,17 @@ class LongTest(unittest.TestCase): self.assert_(type(y) is long, "overflowing int conversion must return long not long subtype") + # long -> Py_ssize_t conversion + class X(object): + def __getslice__(self, i, j): + return i, j + + self.assertEqual(X()[-5L:7L], (-5, 7)) + # use the clamping effect to test the smallest and largest longs + # that fit a Py_ssize_t + slicemin, slicemax = X()[-2L**100:2L**100] + self.assertEqual(X()[slicemin:slicemax], (slicemin, slicemax)) + # ----------------------------------- tests of auto int->long conversion def test_auto_overflow(self): |