mem: Use shared_ptr for Ruby Message classes

This patch transitions the Ruby Message and its derived classes from
the ad-hoc RefCountingPtr to the c++11 shared_ptr. There are no
changes in behaviour, and the code modifications are mainly replacing
"new" with "make_shared".

The cloning of derived messages is slightly changed as they previously
relied on overriding the base-class through covariant return types.

3 files changed, 8 insertions, 6 deletions

diff --git a/src/mem/ruby/slicc_interface/Message.hh b/src/mem/ruby/slicc_interface/Message.hh
index 1c842ae69..786c656bc 100644
--- a/src/mem/ruby/slicc_interface/Message.hh
+++ b/src/mem/ruby/slicc_interface/Message.hh
@@ -30,14 +30,14 @@
 #define __MEM_RUBY_SLICC_INTERFACE_MESSAGE_HH__
 
 #include <iostream>
+#include <memory>
 
-#include "base/refcnt.hh"
 #include "mem/packet.hh"
 
 class Message;
-typedef RefCountingPtr<Message> MsgPtr;
+typedef std::shared_ptr<Message> MsgPtr;
 
-class Message : public RefCounted
+class Message
 {
   public:
     Message(Tick curTime)
@@ -54,7 +54,7 @@ class Message : public RefCounted
 
     virtual ~Message() { }
 
-    virtual Message* clone() const = 0;
+    virtual MsgPtr clone() const = 0;
     virtual void print(std::ostream& out) const = 0;
     virtual void setIncomingLink(int) {}
     virtual void setVnet(int) {}
diff --git a/src/mem/ruby/slicc_interface/NetworkMessage.hh b/src/mem/ruby/slicc_interface/NetworkMessage.hh
index 10d78251a..1b5edcfcd 100644
--- a/src/mem/ruby/slicc_interface/NetworkMessage.hh
+++ b/src/mem/ruby/slicc_interface/NetworkMessage.hh
@@ -30,13 +30,14 @@
 #define __MEM_RUBY_SLICC_INTERFACE_NETWORKMESSAGE_HH__
 
 #include <iostream>
+#include <memory>
 
 #include "mem/protocol/MessageSizeType.hh"
 #include "mem/ruby/common/NetDest.hh"
 #include "mem/ruby/slicc_interface/Message.hh"
 
 class NetworkMessage;
-typedef RefCountingPtr<NetworkMessage> NetMsgPtr;
+typedef std::shared_ptr<NetworkMessage> NetMsgPtr;
 
 class NetworkMessage : public Message
 {
diff --git a/src/mem/ruby/slicc_interface/RubyRequest.hh b/src/mem/ruby/slicc_interface/RubyRequest.hh
index 49964ebb9..357eddbb5 100644
--- a/src/mem/ruby/slicc_interface/RubyRequest.hh
+++ b/src/mem/ruby/slicc_interface/RubyRequest.hh
@@ -71,7 +71,8 @@ class RubyRequest : public Message
     }
 
     RubyRequest(Tick curTime) : Message(curTime) {}
-    RubyRequest* clone() const { return new RubyRequest(*this); }
+    MsgPtr clone() const
+    { return std::shared_ptr<Message>(new RubyRequest(*this)); }
 
     const Address& getLineAddress() const { return m_LineAddress; }
     const Address& getPhysicalAddress() const { return m_PhysicalAddress; }