Antoine Pitrou's patch for bug 2507; exception state lives too long in

3.0.

diff --git a/Lib/test/test_exceptions.py b/Lib/test/test_exceptions.py
index ae4687f17dfaedcd4724909f2358aa9992682035..0574356d133e13784d82a1bf980dde0c9574e97e 100644 (file)
--- a/Lib/test/test_exceptions.py
+++ b/Lib/test/test_exceptions.py
@@ -4,6 +4,7 @@ import os
 import sys
 import unittest
 import pickle
+import weakref
 
 from test.test_support import TESTFN, unlink, run_unittest
 
@@ -400,8 +401,9 @@ class ExceptionTests(unittest.TestCase):
         self.failUnless(str(Exception('a')))
         self.failUnless(str(Exception('a')))
 
-    def testExceptionCleanup(self):
-        # Make sure "except V as N" exceptions are cleaned up properly
+    def testExceptionCleanupNames(self):
+        # Make sure the local variable bound to the exception instance by
+        # an "except" statement is only visible inside the except block.
 
         try:
             raise Exception()
@@ -410,6 +412,31 @@ class ExceptionTests(unittest.TestCase):
             del e
         self.failIf('e' in locals())
 
+    def testExceptionCleanupState(self):
+        # Make sure exception state is cleaned up as soon as the except
+        # block is left. See #2507
+
+        class MyException(Exception):
+            def __init__(self, obj):
+                self.obj = obj
+        class MyObj:
+            pass
+
+        def inner_raising_func():
+            # Create some references in exception value and traceback
+            local_ref = obj
+            raise MyException(obj)
+
+        obj = MyObj()
+        wr = weakref.ref(obj)
+        try:
+            inner_raising_func()
+        except MyException as e:
+            pass
+        obj = None
+        obj = wr()
+        self.failUnless(obj is None, "%s" % obj)
+
 
 def test_main():
     run_unittest(ExceptionTests)

diff --git a/Python/ceval.c b/Python/ceval.c
index bac8278126ffe91efac75a9daa72ca14107ddadc..defd00299f127d8686a391a126538b87eebe60c7 100644 (file)
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -1477,6 +1477,19 @@ PyEval_EvalFrameEx(PyFrameObject *f, int throwflag)
                                        "'finally' pops bad exception");
                                why = WHY_EXCEPTION;
                        }
+                       /*
+                         Make sure the exception state is cleaned up before
+                         the end of an except block. This ensures objects
+                         referenced by the exception state are not kept
+                         alive too long.
+                         See #2507.
+                       */
+                       if (tstate->frame->f_exc_type != NULL)
+                               reset_exc_info(tstate);
+                       else {
+                               assert(tstate->frame->f_exc_value == NULL);
+                               assert(tstate->frame->f_exc_traceback == NULL);
+                       }
                        Py_DECREF(v);
                        break;