ruby: get rid of RefCnt and Allocator stuff use base/refcnt.hh

This was somewhat tricky because the RefCnt API was somewhat odd.  The
biggest confusion was that the the RefCnt object's constructor that
took a TYPE& cloned the object.  I created an explicit virtual clone()
function for things that took advantage of this version of the
constructor.  I was conservative and used clone() when I was in doubt
of whether or not it was necessary.  I still think that there are
probably too many instances of clone(), but hopefully not too many.

I converted several instances of const MsgPtr & to a simple MsgPtr.
If the function wants to avoid the overhead of creating another
reference, then it should just use a regular pointer instead of a ref
counting ptr.

There were a couple of instances where refcounted objects were created
on the stack.  This seems pretty dangerous since if you ever
accidentally make a reference to that object with a ref counting
pointer, bad things are bound to happen.

1 files changed, 4 insertions, 4 deletions

diff --git a/src/mem/ruby/network/simple/PerfectSwitch.cc b/src/mem/ruby/network/simple/PerfectSwitch.cc
index cf3a5af9c..8e6114ba9 100644
--- a/src/mem/ruby/network/simple/PerfectSwitch.cc
+++ b/src/mem/ruby/network/simple/PerfectSwitch.cc
@@ -170,7 +170,7 @@ PerfectSwitch::wakeup()
 
                 // Peek at message
                 msg_ptr = m_in[incoming][vnet]->peekMsgPtr();
-                net_msg_ptr = dynamic_cast<NetworkMessage*>(msg_ptr.ref());
+                net_msg_ptr = safe_cast<NetworkMessage*>(msg_ptr.get());
                 DEBUG_EXPR(NETWORK_COMP, MedPrio, *net_msg_ptr);
 
                 output_links.clear();
@@ -272,7 +272,7 @@ PerfectSwitch::wakeup()
 
                     // This magic line creates a private copy of the
                     // message
-                    unmodified_msg_ptr = *(msg_ptr.ref());
+                    unmodified_msg_ptr = msg_ptr->clone();
                 }
 
                 // Enqueue it - for all outgoing queues
@@ -282,13 +282,13 @@ PerfectSwitch::wakeup()
                     if (i > 0) {
                         // create a private copy of the unmodified
                         // message
-                        msg_ptr = *(unmodified_msg_ptr.ref());
+                        msg_ptr = unmodified_msg_ptr->clone();
                     }
 
                     // Change the internal destination set of the
                     // message so it knows which destinations this
                     // link is responsible for.
-                    net_msg_ptr = safe_cast<NetworkMessage*>(msg_ptr.ref());
+                    net_msg_ptr = safe_cast<NetworkMessage*>(msg_ptr.get());
                     net_msg_ptr->getInternalDestination() =
                         output_link_destinations[i];