mem: Add predecessor to SenderState base class

This patch adds a predecessor field to the SenderState base class to
make the process of linking them up more uniform, and enable a
traversal of the stack without knowing the specific type of the
subclasses.

There are a number of simplifications done as part of changing the
SenderState, particularly in the RubyTest.

1 files changed, 16 insertions, 14 deletions

diff --git a/src/cpu/testers/rubytest/RubyTester.hh b/src/cpu/testers/rubytest/RubyTester.hh
index 2fed84e2d..df1bc1fbb 100644
--- a/src/cpu/testers/rubytest/RubyTester.hh
+++ b/src/cpu/testers/rubytest/RubyTester.hh
@@ -1,4 +1,16 @@
 /*
+ * Copyright (c) 2013 ARM Limited
+ * All rights reserved
+ *
+ * The license below extends only to copyright in the software and shall
+ * not be construed as granting a license to any other intellectual
+ * property including but not limited to intellectual property relating
+ * to a hardware implementation of the functionality of the software
+ * licensed hereunder.  You may use the software subject to the license
+ * terms below provided that you ensure that this notice is replicated
+ * unmodified and in its entirety in all distributions of the software,
+ * modified or unmodified, in source code or in binary form.
+ *
  * Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
  * Copyright (c) 2009 Advanced Micro Devices, Inc.
  * All rights reserved.
@@ -69,20 +81,10 @@ class RubyTester : public MemObject
 
     struct SenderState : public Packet::SenderState
     {
-        SubBlock* subBlock;
-        Packet::SenderState *saved;
-
-        SenderState(Address addr, int size,
-                    Packet::SenderState *sender_state = NULL)
-            : saved(sender_state)
-        {
-            subBlock = new SubBlock(addr, size);
-        }
-
-        ~SenderState()
-        {
-            delete subBlock;
-        }
+        SubBlock subBlock;
+
+        SenderState(Address addr, int size) : subBlock(addr, size) {}
+
     };
 
     typedef RubyTesterParams Params;