Better handling of stepping out of a function...

src/debug.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 252 matching lines @@
 
   static Handle<Object> GetSourceBreakLocations(
       Handle<SharedFunctionInfo> shared);
 
   // Getter for the debug_context.
   inline static Handle<Context> debug_context() { return debug_context_; }
 
   // Check whether a global object is the debug global object.
   static bool IsDebugGlobal(GlobalObject* global);
 
+  // Check whether this frame is just about to return.
+  static bool IsBreakAtReturn(JavaScriptFrame* frame);
+
   // Fast check to see if any break points are active.
   inline static bool has_break_points() { return has_break_points_; }
 
   static void NewBreak(StackFrame::Id break_frame_id);
   static void SetBreak(StackFrame::Id break_frame_id, int break_id);
   static StackFrame::Id break_frame_id() {
     return thread_local_.break_frame_id_;
   }
   static int break_id() { return thread_local_.break_id_; }
 
@@ skipping 663 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(MessageDispatchHelperThread);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 #endif  // V8_DEBUG_H_