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lookdict: Reduce obfuscating code duplication with a judicious goto. 

This code is likely to get even hairier to squash core dumps due to
mutating comparisons, and it's hard enough to follow without that.
This commit is contained in:
Tim Peters 2001-06-03 04:14:43 +00:00
parent 00d0cb6ec3
commit 7b5d0afb1e
1 changed files with 21 additions and 25 deletions
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46
Objects/dictobject.c
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@ -251,8 +251,8 @@ 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 restore_error;
register int checked_error;
register int cmp;
PyObject *err_type, *err_value, *err_tb;
@ -260,6 +260,8 @@ lookdict(dictobject *mp, PyObject *key, register long hash)
ep = &ep0[i];
if (ep->me_key == NULL || ep->me_key == key)
return ep;
restore_error = checked_error = 0;
if (ep->me_key == dummy)
freeslot = ep;
else {
@ -271,13 +273,9 @@ lookdict(dictobject *mp, PyObject *key, register long hash)
PyErr_Fetch(&err_type, &err_value, &err_tb);
}
cmp = PyObject_RichCompareBool(ep->me_key, key, Py_EQ);
if (cmp > 0) {
if (restore_error)
PyErr_Restore(err_type, err_value,
err_tb);
return ep;
}
else if (cmp < 0)
if (cmp > 0)
goto Done;
if (cmp < 0)
PyErr_Clear();
}
freeslot = NULL;
@ -289,16 +287,13 @@ lookdict(dictobject *mp, PyObject *key, register long hash)
i = (i << 2) + i + perturb + 1;
ep = &ep0[i & mask];
if (ep->me_key == NULL) {
if (restore_error)
PyErr_Restore(err_type, err_value, err_tb);
return freeslot == NULL ? ep : freeslot;
if (freeslot != NULL)
ep = freeslot;
break;
}
if (ep->me_key == key) {
if (restore_error)
PyErr_Restore(err_type, err_value, err_tb);
return ep;
}
else if (ep->me_hash == hash && ep->me_key != dummy) {
if (ep->me_key == key)
break;
if (ep->me_hash == hash && ep->me_key != dummy) {
if (!checked_error) {
checked_error = 1;
if (PyErr_Occurred()) {
@ -308,18 +303,19 @@ lookdict(dictobject *mp, PyObject *key, register long hash)
}
}
cmp = PyObject_RichCompareBool(ep->me_key, key, Py_EQ);
if (cmp > 0) {
if (restore_error)
PyErr_Restore(err_type, err_value,
err_tb);
return ep;
}
else if (cmp < 0)
if (cmp > 0)
break;
if (cmp < 0)
PyErr_Clear();
}
else if (ep->me_key == dummy && freeslot == NULL)
freeslot = ep;
}
Done:
if (restore_error)
PyErr_Restore(err_type, err_value, err_tb);
return ep;
}
/*