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Clear errors raised by PyObject_Compare() without losing any existing

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exception context.  This avoids improperly propogating errors raised by
a user-defined __cmp__() by a subsequent lookup operation.

This patch does *not* include the performance enhancement patch for
dictionaries with string keys only; that will be checked in separately.

This closes SourceForge patch #101277 and bug #112558.
This commit is contained in:
Fred Drake 2000-08-31 19:04:07 +00:00
parent a3895c0d29
commit c88b99ce06
1 changed files with 44 additions and 9 deletions
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53
Objects/dictobject.c
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@ -139,6 +139,10 @@ lookdict(dictobject *mp, PyObject *key, register long hash)
register unsigned int mask = mp->ma_size-1;
dictentry *ep0 = mp->ma_table;
register dictentry *ep;
register int restore_error = 0;
register int checked_error = 0;
register int cmp;
PyObject *err_type, *err_value, *err_tb;
/* We must come up with (i, incr) such that 0 <= i < ma_size
and 0 < incr < ma_size and both are a function of hash */
i = (~hash) & mask;
@ -151,14 +155,25 @@ lookdict(dictobject *mp, PyObject *key, register long hash)
if (ep->me_key == dummy)
freeslot = ep;
else {
if (ep->me_hash == hash &&
PyObject_Compare(ep->me_key, key) == 0)
{
return ep;
if (ep->me_hash == hash) {
/* error can't have been checked yet */
checked_error = 1;
if (PyErr_Occurred()) {
restore_error = 1;
PyErr_Fetch(&err_type, &err_value, &err_tb);
}
cmp = PyObject_Compare(ep->me_key, key);
if (PyErr_Occurred())
PyErr_Clear();
else if (cmp == 0) {
if (restore_error)
PyErr_Restore(err_type, err_value,
err_tb);
return ep;
}
}
freeslot = NULL;
}
/* XXX What if PyObject_Compare returned an exception? */
/* Derive incr from hash, just to make it more arbitrary. Note that
incr must not be 0, or we will get into an infinite loop.*/
incr = (hash ^ ((unsigned long)hash >> 3)) & mask;
@ -167,6 +182,8 @@ lookdict(dictobject *mp, PyObject *key, register long hash)
for (;;) {
ep = &ep0[(i+incr)&mask];
if (ep->me_key == NULL) {
if (restore_error)
PyErr_Restore(err_type, err_value, err_tb);
if (freeslot != NULL)
return freeslot;
else
@ -176,12 +193,30 @@ lookdict(dictobject *mp, PyObject *key, register long hash)
if (freeslot == NULL)
freeslot = ep;
}
else if (ep->me_key == key ||
(ep->me_hash == hash &&
PyObject_Compare(ep->me_key, key) == 0)) {
else if (ep->me_key == key) {
if (restore_error)
PyErr_Restore(err_type, err_value, err_tb);
return ep;
}
else if (ep->me_hash == hash) {
if (!checked_error) {
checked_error = 1;
if (PyErr_Occurred()) {
restore_error = 1;
PyErr_Fetch(&err_type, &err_value,
&err_tb);
}
}
cmp = PyObject_Compare(ep->me_key, key);
if (PyErr_Occurred())
PyErr_Clear();
else if (cmp == 0) {
if (restore_error)
PyErr_Restore(err_type, err_value,
err_tb);
return ep;
}
}
/* XXX What if PyObject_Compare returned an exception? */
/* Cycle through GF(2^n)-{0} */
incr = incr << 1;
if (incr > mask)