Merged revisions 72907 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/trunk

........
  r72907 | benjamin.peterson | 2009-05-24 21:40:21 -0500 (Sun, 24 May 2009) | 1 line

  handle errors from _PyObject_LookupSpecial when __get__ fails
........

Lib/test/test_descr.py

@@ -1595,7 +1595,11 @@ order (MRO) for bases """
             def __get__(self, obj, owner):
                 record.append(1)
                 return self.impl.__get__(obj, owner)
-
+        class MyException(Exception):
+            pass
+        class ErrDescr(object):
+            def __get__(self, obj, owner):
+                raise MyException
 
         for name, runner, meth_impl, ok, env in specials:
             class X(Checker):
@@ -1614,6 +1618,18 @@ order (MRO) for bases """
             runner(X())
             self.assertEqual(record, [1], name)
 
+            class X(Checker):
+                pass
+            for attr, obj in env.items():
+                setattr(X, attr, obj)
+            setattr(X, name, ErrDescr())
+            try:
+                runner(X())
+            except MyException:
+                pass
+            else:
+                self.fail("{0!r} didn't raise".format(name))
+
     def test_specials(self):
         # Testing special operators...
         # Test operators like __hash__ for which a built-in default exists

Objects/abstract.c

@@ -90,8 +90,12 @@ _PyObject_LengthHint(PyObject *o, Py_ssize_t defaultvalue)
 
 	/* try o.__length_hint__() */
         hintmeth = _PyObject_LookupSpecial(o, "__length_hint__", &hintstrobj);
-	if (hintmeth == NULL)
-		return defaultvalue;
+	if (hintmeth == NULL) {
+		if (PyErr_Occurred())
+			return -1;
+		else
+			return defaultvalue;
+	}
 	ro = PyObject_CallFunctionObjArgs(hintmeth, NULL);
 	Py_DECREF(hintmeth);
 	if (ro == NULL) {
@@ -2592,6 +2596,8 @@ PyObject_IsInstance(PyObject *inst, PyObject *cls)
 		}
 		return ok;
 	}
+	else if (PyErr_Occurred())
+		return -1;
 	return recursive_isinstance(inst, cls);
 }
 
@@ -2655,6 +2661,8 @@ PyObject_IsSubclass(PyObject *derived, PyObject *cls)
 		}
 		return ok;
 	}
+	else if (PyErr_Occurred())
+		return -1;
 	return recursive_issubclass(derived, cls);
 }
 

Objects/enumobject.c

@@ -238,6 +238,8 @@ reversed_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 		Py_DECREF(reversed_meth);
 		return res;
 	}
+	else if (PyErr_Occurred())
+		return NULL;
 
 	if (!PySequence_Check(seq)) {
 		PyErr_SetString(PyExc_TypeError,

Objects/object.c

@@ -497,6 +497,8 @@ PyObject_Bytes(PyObject *v)
             }
             return result;
 	}
+	else if (PyErr_Occurred())
+		return NULL;
 	return PyBytes_FromObject(v);
 }
 

Python/sysmodule.c

@@ -652,10 +652,12 @@ sys_getsizeof(PyObject *self, PyObject *args, PyObject *kwds)
 
 	method = _PyObject_LookupSpecial(o, "__sizeof__",
 					 &str__sizeof__);
-	if (method == NULL)
-		PyErr_Format(PyExc_TypeError,
-			     "Type %.100s doesn't define __sizeof__",
-			     Py_TYPE(o)->tp_name);
+	if (method == NULL) {
+		if (!PyErr_Occurred())
+			PyErr_Format(PyExc_TypeError,
+				     "Type %.100s doesn't define __sizeof__",
+				     Py_TYPE(o)->tp_name);
+	}
 	else {
 		res = PyObject_CallFunctionObjArgs(method, NULL);
 		Py_DECREF(method);