[python] 2 bug fixes in new-backtrace

[Tom Tromey <tromey at redhat dot com>]

This fixes a couple of bugs in new-backtrace.
Now you can actually install a backtrace filter.

Tom

2008-12-02  Tom Tromey  <tromey@redhat.com>

	* python/lib/gdb/command/backtrace.py (FrameWrapper.__getattr__):
	Rename from __getattribute__.
	* python/lib/gdb/backtrace.py (push_frame_filter): Add missing
	'global'.
	(create_frame_filter): Likewise.

diff --git a/gdb/python/lib/gdb/backtrace.py b/gdb/python/lib/gdb/backtrace.py
index 317c6d8..2baab5f 100644
--- a/gdb/python/lib/gdb/backtrace.py
+++ b/gdb/python/lib/gdb/backtrace.py
@@ -28,12 +28,14 @@ def push_frame_filter (constructor):
 The filter will be passed an iterator as an argument.  The iterator
 will return gdb.Frame-like objects.  The filter should in turn act as
 an iterator returning such objects."""
+    global frame_filter
     if frame_filter == None:
         frame_filter = constructor
     else:
         frame_filter = lambda iterator: constructor (frame_filter (iterator))
 
 def create_frame_filter (iter):
+    global frame_filter
     if frame_filter is None:
         return iter
     return frame_filter (iter)
diff --git a/gdb/python/lib/gdb/command/backtrace.py b/gdb/python/lib/gdb/command/backtrace.py
index 2884b72..9e37cef 100644
--- a/gdb/python/lib/gdb/command/backtrace.py
+++ b/gdb/python/lib/gdb/command/backtrace.py
@@ -111,7 +111,7 @@ class FrameWrapper:
             if full:
                 self.print_frame_locals (stream, func)
 
-    def __getattribute__ (self, name):
+    def __getattr__ (self, name):
         return getattr (self.frame, name)
 
 class ReverseBacktraceParameter (gdb.Parameter):