Ruby: Use MasterPort base-class pointers where possible

This patch simplifies future patches by changing the pointer type used
in a number of the Ruby testers to use MasterPort instead of using a
derived CpuPort class. There is no reason for using the more
specialised pointers, and there is no longer a need to do any casting.

With the latest changes to the tester, organising ports as readers and
writes, things got a bit more complicated, and the "type" now had to
be removed to be able to fall back to using MasterPort rather than
CpuPort.

3 files changed, 22 insertions, 31 deletions

diff --git a/src/cpu/testers/rubytest/Check.cc b/src/cpu/testers/rubytest/Check.cc
index 892e05dd0..8188fecbb 100644
--- a/src/cpu/testers/rubytest/Check.cc
+++ b/src/cpu/testers/rubytest/Check.cc
@@ -82,8 +82,7 @@ Check::initiatePrefetch()
     DPRINTF(RubyTest, "initiating prefetch\n");
 
     int index = random() % m_num_readers;
-    RubyTester::CpuPort* port =
-      safe_cast<RubyTester::CpuPort*>(m_tester_ptr->getReadableCpuPort(index));
+    MasterPort* port = m_tester_ptr->getReadableCpuPort(index);
 
     Request::Flags flags;
     flags.set(Request::PREFETCH);
@@ -95,7 +94,7 @@ Check::initiatePrefetch()
         cmd = MemCmd::ReadReq;
 
         // if necessary, make the request an instruction fetch
-        if (port->type == RubyTester::CpuPort::InstOnly) {
+        if (m_tester_ptr->isInstReadableCpuPort(index)) {
             flags.set(Request::INST_FETCH);
         }
     } else {
@@ -137,8 +136,7 @@ Check::initiateFlush()
     DPRINTF(RubyTest, "initiating Flush\n");
 
     int index = random() % m_num_writers;
-    RubyTester::CpuPort* port =
-      safe_cast<RubyTester::CpuPort*>(m_tester_ptr->getWritableCpuPort(index));
+    MasterPort* port = m_tester_ptr->getWritableCpuPort(index);
 
     Request::Flags flags;
 
@@ -168,8 +166,7 @@ Check::initiateAction()
     assert(m_status == TesterStatus_Idle);
 
     int index = random() % m_num_writers;
-    RubyTester::CpuPort* port =
-      safe_cast<RubyTester::CpuPort*>(m_tester_ptr->getWritableCpuPort(index));
+    MasterPort* port = m_tester_ptr->getWritableCpuPort(index);
 
     Request::Flags flags;
 
@@ -233,13 +230,12 @@ Check::initiateCheck()
     assert(m_status == TesterStatus_Ready);
 
     int index = random() % m_num_readers;
-    RubyTester::CpuPort* port =
-      safe_cast<RubyTester::CpuPort*>(m_tester_ptr->getReadableCpuPort(index));
+    MasterPort* port = m_tester_ptr->getReadableCpuPort(index);
 
     Request::Flags flags;
 
     // If necessary, make the request an instruction fetch
-    if (port->type == RubyTester::CpuPort::InstOnly) {
+    if (m_tester_ptr->isInstReadableCpuPort(index)) {
         flags.set(Request::INST_FETCH);
     }
 
diff --git a/src/cpu/testers/rubytest/RubyTester.cc b/src/cpu/testers/rubytest/RubyTester.cc
index 67f4c372a..1e9827515 100644
--- a/src/cpu/testers/rubytest/RubyTester.cc
+++ b/src/cpu/testers/rubytest/RubyTester.cc
@@ -75,13 +75,11 @@ RubyTester::RubyTester(const Params *p)
     //
     for (int i = 0; i < p->port_cpuInstPort_connection_count; ++i) {
         readPorts.push_back(new CpuPort(csprintf("%s-instPort%d", name(), i),
-                                        this, i,
-                                        RubyTester::CpuPort::InstOnly));
+                                        this, i));
     }
     for (int i = 0; i < p->port_cpuDataPort_connection_count; ++i) {
-        CpuPort *port = NULL;
-        port = new CpuPort(csprintf("%s-dataPort%d", name(), i), this, i,
-                           RubyTester::CpuPort::DataOnly);
+        CpuPort *port = new CpuPort(csprintf("%s-dataPort%d", name(), i),
+                                    this, i);
         readPorts.push_back(port);
         writePorts.push_back(port);
     }
@@ -168,6 +166,12 @@ RubyTester::CpuPort::recvTiming(PacketPtr pkt)
     return true;
 }
 
+bool
+RubyTester::isInstReadableCpuPort(int idx)
+{
+    return idx < m_num_inst_ports;
+}
+
 MasterPort*
 RubyTester::getReadableCpuPort(int idx)
 {
diff --git a/src/cpu/testers/rubytest/RubyTester.hh b/src/cpu/testers/rubytest/RubyTester.hh
index aaf609e1e..266209b8f 100644
--- a/src/cpu/testers/rubytest/RubyTester.hh
+++ b/src/cpu/testers/rubytest/RubyTester.hh
@@ -56,23 +56,12 @@ class RubyTester : public MemObject
         // only instruction or data requests, not both.  However, for those
         // RubyPorts that support both types of requests, separate InstOnly
         // and DataOnly CpuPorts will map to that RubyPort
-        //
-        enum Type
-        {
-            // Port supports only instruction requests
-            InstOnly,
-            // Port supports only data requests
-            DataOnly
-        };
-
-        CpuPort(const std::string &_name, RubyTester *_tester, int _idx,
-                Type _type)
-            : MasterPort(_name, _tester), tester(_tester), idx(_idx),
-              type(_type)
+
+        CpuPort(const std::string &_name, RubyTester *_tester, int _idx)
+            : MasterPort(_name, _tester), tester(_tester), idx(_idx)
         {}
 
         int idx;
-        Type type;
 
       protected:
         virtual bool recvTiming(PacketPtr pkt);
@@ -105,6 +94,8 @@ class RubyTester : public MemObject
     virtual MasterPort &getMasterPort(const std::string &if_name,
                                       int idx = -1);
 
+    bool isInstReadableCpuPort(int idx);
+
     MasterPort* getReadableCpuPort(int idx);
     MasterPort* getWritableCpuPort(int idx);
 
@@ -154,8 +145,8 @@ class RubyTester : public MemObject
 
     int m_num_cpus;
     uint64 m_checks_completed;
-    std::vector<CpuPort*> writePorts;
-    std::vector<CpuPort*> readPorts;
+    std::vector<MasterPort*> writePorts;
+    std::vector<MasterPort*> readPorts;
     uint64 m_checks_to_complete;
     int m_deadlock_threshold;
     int m_num_writers;