Working on this

docs/REFCOUNTING.md

@@ -15,7 +15,7 @@ Unless specified, arguments are borrowed and return values are owned.  This can
 Exception safety
 
 Helpers:
-AUTO_DECREF, autoDecref, incref
+AUTO_DECREF, autoDecref, incref. DecrefHandle
 
 Invariant: all paths through a function should leave each variable with 0 net refs.  (This includes paths out via exceptions.)
 

pyston_gdbinit.txt

@@ -2,6 +2,10 @@ handle SIGUSR2 pass nostop noprint
 
 skip file /usr/include/c++/4.8/bits/stl_vector.h
 skip file /usr/include/c++/4.9/bits/stl_vector.h
+skip file /usr/include/c++/4.8/bits/unique_ptr.h
+skip file /usr/include/c++/4.9/bits/unique_ptr.h
+skip file /usr/include/c++/4.8/bits/move.h
+skip file /usr/include/c++/4.9/bits/move.h
 
 skip pyston::ArgPassSpec::ArgPassSpec(int, int, bool, bool)
 skip pyston::InternedString::getBox() const

test/tests/descr_selfdelete.py

@@ -24,16 +24,20 @@ def make_closure(f):
         return r
     return inner
 
-# The standard case, when the function is obtained via standard evaluation rules:
-class C(object):
+def f():
+    # The standard case, when the function is obtained via standard evaluation rules:
+    class C(object):
         @make_closure
         def f(self, other_arg=2.5**10):
             print "f"
             print other_arg
             del C.f
             print other_arg
-c = C()
-c.f()
+    c = C()
+    c.f()
+f()
+f()
+f()
 
 def f():
     class C(object):
@@ -53,6 +57,7 @@ def f():
         print e
 f()
 f()
+f()
 
 def f():
     class C(object):
@@ -73,6 +78,7 @@ def f():
         print e
 f()
 f()
+f()
 
 def f():
     class C(object):
@@ -92,9 +98,12 @@ def f():
         print e
 f()
 f()
+f()
 
 
 def f():
+    class C(object):
+        pass
     class D(object):
         @make_closure
         def __get__(self, obj, type, other_arg=2.4**10):
@@ -125,14 +134,41 @@ def f():
     print c.x
 f()
 f()
+f()
+
+
+# Deleting the descriptor object itself:
+def f():
+    class C(object):
+        pass
+    class D(object):
+        def __get__(self, obj, type, other_arg=2.4**10):
+            print "D.__get__"
+            print other_arg
+            del C.x
+            print other_arg
+            sys._clear_type_cache()
+            print other_arg
+            return 1
+
+    C.x = D()
+    c = C()
+    print c.x
+    print c.x
+f()
+f()
+f()
 
-# TODO: lots of other cases that could/should get tested.
 
 
 # Related:
-@make_closure
-def f(a1=2.0**10, a2=2.1**10):
+def f():
+    @make_closure
+    def g(a1=2.0**10, a2=2.1**10):
         f.func_defaults = ()
         print a1, a2
         del globals()['f']
+    g()
+f()
+f()
 f()