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Issue #1621: Fix undefined behaviour in bytes.__hash__, str.__hash__, tuple.__hash__, frozenset.__hash__ and set indexing operations.

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This commit is contained in:
Mark Dickinson 2011-09-24 18:18:40 +01:00
parent 0390151100
commit 57e683e53e
5 changed files with 26 additions and 25 deletions
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10
Objects/unicodeobject.c
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@ -7721,22 +7721,22 @@ unicode_getitem(PyUnicodeObject *self, Py_ssize_t index)
}
/* Believe it or not, this produces the same value for ASCII strings
as string_hash(). */
as bytes_hash(). */
static Py_hash_t
unicode_hash(PyUnicodeObject *self)
{
Py_ssize_t len;
Py_UNICODE *p;
Py_hash_t x;
Py_uhash_t x;
if (self->hash != -1)
return self->hash;
len = Py_SIZE(self);
p = self->str;
x = *p << 7;
x = (Py_uhash_t)*p << 7;
while (--len >= 0)
x = (1000003*x) ^ *p++;
x ^= Py_SIZE(self);
x = (1000003U*x) ^ (Py_uhash_t)*p++;
x ^= (Py_uhash_t)Py_SIZE(self);
if (x == -1)
x = -2;
self->hash = x;