[Python-checkins] python/dist/src/Objects setobject.c,1.37,1.38
rhettinger@users.sourceforge.net
rhettinger at users.sourceforge.net
Mon Aug 1 23:39:31 CEST 2005
Update of /cvsroot/python/python/dist/src/Objects
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv3433/Objects
Modified Files:
setobject.c
Log Message:
* Improve code for the empty frozenset singleton:
- Handle both frozenset() and frozenset([]).
- Do not use singleton for frozenset subclasses.
- Finalize the singleton.
- Add test cases.
* Factor-out set_update_internal() from set_update(). Simplifies the
code for several internal callers.
* Factor constant expressions out of loop in set_merge_internal().
* Minor comment touch-ups.
Index: setobject.c
===================================================================
RCS file: /cvsroot/python/python/dist/src/Objects/setobject.c,v
retrieving revision 1.37
retrieving revision 1.38
diff -u -d -r1.37 -r1.38
--- setobject.c 1 Aug 2005 05:26:41 -0000 1.37
+++ setobject.c 1 Aug 2005 21:39:28 -0000 1.38
@@ -311,9 +311,6 @@
return 0;
}
-/*** Internal functions (derived from public dictionary api functions ) ***/
-
-
/* CAUTION: set_add_internal() must guarantee that it won't resize the table */
static int
set_add_internal(register PySetObject *so, PyObject *key)
@@ -435,10 +432,10 @@
/*
* Iterate over a set table. Use like so:
*
- * int i;
+ * int pos;
* PyObject *key;
- * i = 0; # important! i should not otherwise be changed by you
- * while (set_next_internal(yourset, &i, &key)) {
+ * pos = 0; # important! pos should not otherwise be changed by you
+ * while (set_next_internal(yourset, &pos, &key)) {
* Refer to borrowed reference in key.
* }
*
@@ -467,14 +464,13 @@
return 1;
}
-/* Methods */
-
static int
set_merge_internal(PySetObject *so, PyObject *otherset)
{
- register PySetObject *other;
+ PySetObject *other;
register int i;
- setentry *entry;
+ register setentry *entry, *othertable;
+ register int othermask;
assert (PyAnySet_Check(so));
assert (PyAnySet_Check(otherset));
@@ -491,8 +487,10 @@
if (set_table_resize(so, (so->used + other->used)*2) != 0)
return -1;
}
- for (i = 0; i <= other->mask; i++) {
- entry = &other->table[i];
+ othermask = other->mask;
+ othertable = other->table;
+ for (i = 0; i <= othermask; i++) {
+ entry = &othertable[i];
if (entry->key != NULL &&
entry->key != dummy) {
Py_INCREF(entry->key);
@@ -517,9 +515,9 @@
return key != NULL && key != dummy;
}
-static PyTypeObject PySetIter_Type; /* Forward */
+/***** Set iterator types **********************************************/
-/* Set iterator types */
+static PyTypeObject PySetIter_Type; /* Forward */
typedef struct {
PyObject_HEAD
@@ -647,41 +645,52 @@
All rights reserved.
*/
-static PyObject *
-set_update(PySetObject *so, PyObject *other)
+static int
+set_len(PyObject *so)
+{
+ return ((PySetObject *)so)->used;
+}
+
+static int
+set_update_internal(PySetObject *so, PyObject *other)
{
PyObject *key, *it;
- if (PyAnySet_Check(other)) {
- if (set_merge_internal(so, other) == -1)
- return NULL;
- Py_RETURN_NONE;
- }
+ if (PyAnySet_Check(other))
+ return set_merge_internal(so, other);
if (PyDict_Check(other)) {
PyObject *key, *value;
int pos = 0;
while (PyDict_Next(other, &pos, &key, &value)) {
if (set_add_internal(so, key) == -1)
- return NULL;
+ return -1;
}
- Py_RETURN_NONE;
+ return 0;
}
it = PyObject_GetIter(other);
if (it == NULL)
- return NULL;
+ return -1;
while ((key = PyIter_Next(it)) != NULL) {
if (set_add_internal(so, key) == -1) {
Py_DECREF(it);
Py_DECREF(key);
- return NULL;
+ return -1;
}
Py_DECREF(key);
}
Py_DECREF(it);
if (PyErr_Occurred())
+ return -1;
+ return 0;
+}
+
+static PyObject *
+set_update(PySetObject *so, PyObject *other)
+{
+ if (set_update_internal(so, other) == -1)
return NULL;
Py_RETURN_NONE;
}
@@ -692,7 +701,6 @@
static PyObject *
make_new_set(PyTypeObject *type, PyObject *iterable)
{
- PyObject *tmp;
register PySetObject *so = NULL;
if (dummy == NULL) { /* Auto-initialize dummy */
@@ -712,37 +720,51 @@
so->weakreflist = NULL;
if (iterable != NULL) {
- tmp = set_update(so, iterable);
- if (tmp == NULL) {
+ if (set_update_internal(so, iterable) == -1) {
Py_DECREF(so);
return NULL;
}
- Py_DECREF(tmp);
}
return (PyObject *)so;
}
+/* The empty frozenset is a singleton */
+static PyObject *emptyfrozenset = NULL;
+
static PyObject *
frozenset_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
- PyObject *iterable = NULL;
- static PyObject *emptyfrozenset = NULL;
+ PyObject *iterable = NULL, *result;
if (!PyArg_UnpackTuple(args, type->tp_name, 0, 1, &iterable))
return NULL;
- if (iterable == NULL) {
- if (type == &PyFrozenSet_Type) {
- if (emptyfrozenset == NULL)
- emptyfrozenset = make_new_set(type, NULL);
- Py_INCREF(emptyfrozenset);
- return emptyfrozenset;
+
+ if (type != &PyFrozenSet_Type)
+ return make_new_set(type, iterable);
+
+ if (iterable != NULL) {
+ /* frozenset(f) is idempotent */
+ if (PyFrozenSet_CheckExact(iterable)) {
+ Py_INCREF(iterable);
+ return iterable;
}
- } else if (PyFrozenSet_CheckExact(iterable)) {
- Py_INCREF(iterable);
- return iterable;
+ result = make_new_set(type, iterable);
+ if (result == NULL || set_len(result))
+ return result;
+ Py_DECREF(result);
}
- return make_new_set(type, iterable);
+ /* The empty frozenset is a singleton */
+ if (emptyfrozenset == NULL)
+ emptyfrozenset = make_new_set(type, NULL);
+ Py_XINCREF(emptyfrozenset);
+ return emptyfrozenset;
+}
+
+void
+PySet_Fini(void)
+{
+ Py_XDECREF(emptyfrozenset);
}
static PyObject *
@@ -786,12 +808,6 @@
return 0;
}
-static int
-set_len(PyObject *so)
-{
- return ((PySetObject *)so)->used;
-}
-
/* set_swap_bodies() switches the contents of any two sets by moving their
internal data pointers and, if needed, copying the internal smalltables.
Semantically equivalent to:
@@ -892,17 +908,14 @@
set_union(PySetObject *so, PyObject *other)
{
PySetObject *result;
- PyObject *rv;
result = (PySetObject *)set_copy(so);
if (result == NULL)
return NULL;
- rv = set_update(result, other);
- if (rv == NULL) {
+ if (set_update_internal(result, other) == -1) {
Py_DECREF(result);
return NULL;
}
- Py_DECREF(rv);
return (PyObject *)result;
}
@@ -924,16 +937,12 @@
static PyObject *
set_ior(PySetObject *so, PyObject *other)
{
- PyObject *result;
-
if (!PyAnySet_Check(other)) {
Py_INCREF(Py_NotImplemented);
return Py_NotImplemented;
}
- result = set_update(so, other);
- if (result == NULL)
+ if (set_update_internal(so, other) == -1)
return NULL;
- Py_DECREF(result);
Py_INCREF(so);
return (PyObject *)so;
}
@@ -1553,7 +1562,6 @@
set_init(PySetObject *self, PyObject *args, PyObject *kwds)
{
PyObject *iterable = NULL;
- PyObject *result;
if (!PyAnySet_Check(self))
return -1;
@@ -1563,12 +1571,7 @@
self->hash = -1;
if (iterable == NULL)
return 0;
- result = set_update(self, iterable);
- if (result != NULL) {
- Py_DECREF(result);
- return 0;
- }
- return -1;
+ return set_update_internal(self, iterable);
}
static PySequenceMethods set_as_sequence = {
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