Implement appropriate __getnewargs__ for all immutable subclassable builtin

types.  The special handling for these can now be removed from save_newobj().
Add some testing for this.

Also add support for setting the 'fast' flag on the Python Pickler class,
which suppresses use of the memo.

Lib/pickle.py

@@ -191,6 +191,7 @@ class Pickler:
         self.memo = {}
         self.proto = int(proto)
         self.bin = proto >= 1
+        self.fast = 0
 
     def clear_memo(self):
         """Clears the pickler's "memo".
@@ -230,6 +231,8 @@ class Pickler:
         # But there appears no advantage to any other scheme, and this
         # scheme allows the Unpickler memo to be implemented as a plain (but
         # growable) array, indexed by memo key.
+        if self.fast:
+            return
         memo_len = len(self.memo)
         self.write(self.put(memo_len))
         self.memo[id(obj)] = memo_len, obj
@@ -378,14 +381,7 @@ class Pickler:
         if getnewargs:
             args = getnewargs()         # This bette not reference obj
         else:
-            # XXX These types should each grow a __getnewargs__
+            args = ()
-            # implementation so this special-casing is unnecessary.
-            for cls in int, long, float, complex, str, UnicodeType, tuple:
-                if cls and isinstance(obj, cls):
-                    args = (cls(obj),)
-                    break
-            else:
-                args = ()
 
         save = self.save
         write = self.write

Lib/test/pickletester.py

@@ -324,6 +324,21 @@ class AbstractPickleTests(unittest.TestCase):
 ##         print
 ##         pickletools.dis(s)
 
+    def test_newobj_generic(self):
+        for proto in [0, 1, 2]:
+            for C in myclasses:
+                B = C.__base__
+                x = C(C.sample)
+                x.foo = 42
+                s = self.dumps(x, proto)
+##                import pickletools
+##                print
+##                pickletools.dis(s)
+                y = self.loads(s)
+                detail = (proto, C, B, x, y, type(y))
+                self.assertEqual(B(x), B(y), detail)
+                self.assertEqual(x.__dict__, y.__dict__, detail)
+
 # XXX Temporary hack, so long as the C implementation of pickle protocol
 # XXX 2 isn't ready.  When it is, move the methods in TempAbstractPickleTests
 # XXX into AbstractPickleTests above, and get rid of TempAbstractPickleTests
@@ -405,11 +420,38 @@ class TempAbstractPickleTests(unittest.TestCase):
         finally:
             copy_reg.remove_extension(__name__, "MyList", 0xfffff0)
 
+class MyInt(int):
+    sample = 1
+
+class MyLong(long):
+    sample = 1L
+
+class MyFloat(float):
+    sample = 1.0
+
+class MyComplex(complex):
+    sample = 1.0 + 0.0j
+
+class MyStr(str):
+    sample = "hello"
+
+class MyUnicode(unicode):
+    sample = u"hello \u1234"
+
 class MyTuple(tuple):
-    pass
+    sample = (1, 2, 3)
 
 class MyList(list):
-    pass
+    sample = [1, 2, 3]
+
+class MyDict(dict):
+    sample = {"a": 1, "b": 2}
+
+myclasses = [MyInt, MyLong, MyFloat,
+             # MyComplex, # XXX complex somehow doesn't work here :-(
+             MyStr, MyUnicode,
+             MyTuple, MyList, MyDict]
+
 
 class SlotList(MyList):
     __slots__ = ["foo"]

Lib/test/test_pickle.py

@@ -11,9 +11,13 @@ from test.pickletester import AbstractPersistentPicklerTests
 
 class PickleTests(AbstractPickleTests, AbstractPickleModuleTests, XXXTemp):
 
-    def setUp(self):
+    def dumps(self, arg, proto=0, fast=0):
-        self.dumps = pickle.dumps
+        # Ignore fast
-        self.loads = pickle.loads
+        return pickle.dumps(arg, proto)
+
+    def loads(self, buf):
+        # Ignore fast
+        return pickle.loads(buf)
 
     module = pickle
     error = KeyError
@@ -22,9 +26,11 @@ class PicklerTests(AbstractPickleTests):
 
     error = KeyError
 
-    def dumps(self, arg, proto=0):
+    def dumps(self, arg, proto=0, fast=0):
         f = StringIO()
         p = pickle.Pickler(f, proto)
+        if fast:
+            p.fast = fast
         p.dump(arg)
         f.seek(0)
         return f.read()
@@ -36,12 +42,14 @@ class PicklerTests(AbstractPickleTests):
 
 class PersPicklerTests(AbstractPersistentPicklerTests):
 
-    def dumps(self, arg, proto=0):
+    def dumps(self, arg, proto=0, fast=0):
         class PersPickler(pickle.Pickler):
             def persistent_id(subself, obj):
                 return self.persistent_id(obj)
         f = StringIO()
         p = PersPickler(f, proto)
+        if fast:
+            p.fast = fast
         p.dump(arg)
         f.seek(0)
         return f.read()

Objects/complexobject.c

@@ -639,8 +639,15 @@ complex_conjugate(PyObject *self)
 	return PyComplex_FromCComplex(c);
 }
 
+static PyObject *
+complex_getnewargs(PyComplexObject *v)
+{
+	return Py_BuildValue("(D)", v->cval);
+}
+
 static PyMethodDef complex_methods[] = {
 	{"conjugate",	(PyCFunction)complex_conjugate,	METH_NOARGS},
+	{"__getnewargs__",	(PyCFunction)complex_getnewargs,	METH_NOARGS},
 	{NULL,		NULL}		/* sentinel */
 };
 

Objects/floatobject.c

@@ -726,6 +726,17 @@ float_subtype_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 	return new;
 }
 
+static PyObject *
+float_getnewargs(PyFloatObject *v)
+{
+	return Py_BuildValue("(d)", v->ob_fval);
+}
+
+static PyMethodDef float_methods[] = {
+	{"__getnewargs__",	(PyCFunction)float_getnewargs,	METH_NOARGS},
+	{NULL,		NULL}		/* sentinel */
+};
+
 PyDoc_STRVAR(float_doc,
 "float(x) -> floating point number\n\
 \n\
@@ -803,7 +814,7 @@ PyTypeObject PyFloat_Type = {
 	0,					/* tp_weaklistoffset */
 	0,					/* tp_iter */
 	0,					/* tp_iternext */
-	0,					/* tp_methods */
+	float_methods,				/* tp_methods */
 	0,					/* tp_members */
 	0,					/* tp_getset */
 	0,					/* tp_base */

Objects/intobject.c

@@ -850,6 +850,17 @@ int_subtype_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 	return new;
 }
 
+static PyObject *
+int_getnewargs(PyIntObject *v)
+{
+	return Py_BuildValue("(l)", v->ob_ival);
+}
+
+static PyMethodDef int_methods[] = {
+	{"__getnewargs__",	(PyCFunction)int_getnewargs,	METH_NOARGS},
+	{NULL,		NULL}		/* sentinel */
+};
+
 PyDoc_STRVAR(int_doc,
 "int(x[, base]) -> integer\n\
 \n\
@@ -931,7 +942,7 @@ PyTypeObject PyInt_Type = {
 	0,					/* tp_weaklistoffset */
 	0,					/* tp_iter */
 	0,					/* tp_iternext */
-	0,					/* tp_methods */
+	int_methods,				/* tp_methods */
 	0,					/* tp_members */
 	0,					/* tp_getset */
 	0,					/* tp_base */

Objects/longobject.c

@@ -2646,6 +2646,17 @@ long_subtype_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 	return (PyObject *)new;
 }
 
+static PyObject *
+long_getnewargs(PyLongObject *v)
+{
+	return Py_BuildValue("(N)", _PyLong_Copy(v));
+}
+
+static PyMethodDef long_methods[] = {
+	{"__getnewargs__",	(PyCFunction)long_getnewargs,	METH_NOARGS},
+	{NULL,		NULL}		/* sentinel */
+};
+
 PyDoc_STRVAR(long_doc,
 "long(x[, base]) -> integer\n\
 \n\
@@ -2726,7 +2737,7 @@ PyTypeObject PyLong_Type = {
 	0,					/* tp_weaklistoffset */
 	0,					/* tp_iter */
 	0,					/* tp_iternext */
-	0,					/* tp_methods */
+	long_methods,				/* tp_methods */
 	0,					/* tp_members */
 	0,					/* tp_getset */
 	0,					/* tp_base */

Objects/stringobject.c

@@ -3045,6 +3045,12 @@ string_splitlines(PyStringObject *self, PyObject *args)
 
 #undef SPLIT_APPEND
 
+static PyObject *
+string_getnewargs(PyStringObject *v)
+{
+	return Py_BuildValue("(s#)", v->ob_sval, v->ob_size);
+}
+
 
 static PyMethodDef
 string_methods[] = {
@@ -3091,6 +3097,7 @@ string_methods[] = {
 	 expandtabs__doc__},
 	{"splitlines", (PyCFunction)string_splitlines, METH_VARARGS,
 	 splitlines__doc__},
+	{"__getnewargs__",	(PyCFunction)string_getnewargs,	METH_NOARGS},
 	{NULL,     NULL}		     /* sentinel */
 };
 

Objects/tupleobject.c

@@ -587,6 +587,18 @@ tuplesubscript(PyTupleObject* self, PyObject* item)
 	}
 }
 
+static PyObject *
+tuple_getnewargs(PyTupleObject *v)
+{
+	return Py_BuildValue("(N)", tupleslice(v, 0, v->ob_size));
+	
+}
+
+static PyMethodDef tuple_methods[] = {
+	{"__getnewargs__",	(PyCFunction)tuple_getnewargs,	METH_NOARGS},
+	{NULL,		NULL}		/* sentinel */
+};
+
 static PyMappingMethods tuple_as_mapping = {
 	(inquiry)tuplelength,
 	(binaryfunc)tuplesubscript,
@@ -625,7 +637,7 @@ PyTypeObject PyTuple_Type = {
 	0,					/* tp_weaklistoffset */
 	tuple_iter,	    			/* tp_iter */
 	0,					/* tp_iternext */
-	0,					/* tp_methods */
+	tuple_methods,				/* tp_methods */
 	0,					/* tp_members */
 	0,					/* tp_getset */
 	0,					/* tp_base */

Objects/unicodeobject.c

@@ -5741,6 +5741,14 @@ unicode_endswith(PyUnicodeObject *self,
 }
 
 
+
+static PyObject *
+unicode_getnewargs(PyUnicodeObject *v)
+{
+	return Py_BuildValue("(u#)", v->str, v->length);
+}
+
+
 static PyMethodDef unicode_methods[] = {
 
     /* Order is according to common usage: often used methods should
@@ -5791,6 +5799,7 @@ static PyMethodDef unicode_methods[] = {
     {"freelistsize", (PyCFunction) unicode_freelistsize, METH_NOARGS},
 #endif
 
+    {"__getnewargs__",	(PyCFunction)unicode_getnewargs, METH_NOARGS},
     {NULL, NULL}
 };