mem: Eliminate the Base(Slave|Master)Port classes.

The Port class has assumed all the duties of the less generic
Base*Port classes, making them unnecessary. Since they don't add
anything but make the code more complex, this change eliminates them.

Change-Id: Ibb9c56def04465f353362595c1f1c5ac5083e5e9
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/20236
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Maintainer: Gabe Black <gabeblack@google.com>

src/arch/generic/tlb.hh

@@ -48,7 +48,6 @@
 #include "sim/sim_object.hh"
 
 class ThreadContext;
-class BaseMasterPort;
 
 class BaseTLB : public SimObject
 {

src/mem/cache/base.cc

@@ -64,9 +64,6 @@
 #include "params/WriteAllocator.hh"
 #include "sim/core.hh"
 
-class BaseMasterPort;
-class BaseSlavePort;
-
 using namespace std;
 
 BaseCache::CacheSlavePort::CacheSlavePort(const std::string &_name,

src/mem/cache/base.hh

@@ -81,9 +81,7 @@
 #include "sim/sim_exit.hh"
 #include "sim/system.hh"
 
-class BaseMasterPort;
 class BasePrefetcher;
-class BaseSlavePort;
 class MSHR;
 class MasterPort;
 class QueueEntry;

src/mem/port.cc

@@ -51,81 +51,11 @@
 #include "base/trace.hh"
 #include "sim/sim_object.hh"
 
-BaseMasterPort::BaseMasterPort(const std::string &name, PortID _id)
-    : Port(name, _id), _baseSlavePort(NULL)
-{
-}
-
-BaseMasterPort::~BaseMasterPort()
-{
-}
-
-BaseSlavePort&
-BaseMasterPort::getSlavePort() const
-{
-    if (_baseSlavePort == NULL)
-        panic("Cannot getSlavePort on master port %s that is not connected\n",
-              name());
-
-    return *_baseSlavePort;
-}
-
-void
-BaseMasterPort::bind(Port &peer)
-{
-    _baseSlavePort = dynamic_cast<BaseSlavePort *>(&peer);
-    fatal_if(!_baseSlavePort, "Attempt to bind port %s to non-master port %s.",
-             name(), peer.name());
-    Port::bind(peer);
-}
-
-void
-BaseMasterPort::unbind()
-{
-    _baseSlavePort = nullptr;
-    Port::unbind();
-}
-
-BaseSlavePort::BaseSlavePort(const std::string &name, PortID _id)
-    : Port(name, _id), _baseMasterPort(NULL)
-{
-}
-
-BaseSlavePort::~BaseSlavePort()
-{
-}
-
-BaseMasterPort&
-BaseSlavePort::getMasterPort() const
-{
-    if (_baseMasterPort == NULL)
-        panic("Cannot getMasterPort on slave port %s that is not connected\n",
-              name());
-
-    return *_baseMasterPort;
-}
-
-void
-BaseSlavePort::bind(Port &peer)
-{
-    _baseMasterPort = dynamic_cast<BaseMasterPort *>(&peer);
-    fatal_if(!_baseMasterPort, "Attempt to bind port %s to non-slave port %s.",
-             name(), peer.name());
-    Port::bind(peer);
-}
-
-void
-BaseSlavePort::unbind()
-{
-    _baseMasterPort = nullptr;
-    Port::unbind();
-}
-
 /**
  * Master port
  */
 MasterPort::MasterPort(const std::string& name, SimObject* _owner, PortID _id)
-    : BaseMasterPort(name, _id), _slavePort(NULL), owner(*_owner)
+    : Port(name, _id), _slavePort(NULL), owner(*_owner)
 {
 }
 
@@ -143,7 +73,7 @@ MasterPort::bind(Port &peer)
     }
     // master port keeps track of the slave port
     _slavePort = slave_port;
-    BaseMasterPort::bind(peer);
+    Port::bind(peer);
     // slave port also keeps track of master port
     _slavePort->slaveBind(*this);
 }
@@ -156,7 +86,7 @@ MasterPort::unbind()
               name());
     _slavePort->slaveUnbind();
     _slavePort = nullptr;
-    BaseMasterPort::unbind();
+    Port::unbind();
 }
 
 AddrRangeList
@@ -182,7 +112,7 @@ MasterPort::printAddr(Addr a)
  * Slave port
  */
 SlavePort::SlavePort(const std::string& name, SimObject* _owner, PortID id)
-    : BaseSlavePort(name, id), _masterPort(NULL), defaultBackdoorWarned(false),
+    : Port(name, id), _masterPort(NULL), defaultBackdoorWarned(false),
     owner(*_owner)
 {
 }
@@ -195,14 +125,14 @@ void
 SlavePort::slaveUnbind()
 {
     _masterPort = NULL;
-    BaseSlavePort::unbind();
+    Port::unbind();
 }
 
 void
 SlavePort::slaveBind(MasterPort& master_port)
 {
     _masterPort = &master_port;
-    BaseSlavePort::bind(master_port);
+    Port::bind(master_port);
 }
 
 Tick

src/mem/port.hh

@@ -59,47 +59,6 @@
 
 class SimObject;
 
-/** Forward declaration */
-class BaseSlavePort;
-
-/**
- * A BaseMasterPort is a protocol-agnostic master port, responsible
- * only for the structural connection to a slave port. The final
- * master port that inherits from the base class must override the
- * bind member function for the specific slave port class.
- */
-class BaseMasterPort : public Port
-{
-  protected:
-    BaseSlavePort *_baseSlavePort;
-
-    BaseMasterPort(const std::string &name, PortID id=InvalidPortID);
-    virtual ~BaseMasterPort();
-
-  public:
-    BaseSlavePort& getSlavePort() const;
-    void bind(Port &peer) override;
-    void unbind() override;
-};
-
-/**
- * A BaseSlavePort is a protocol-agnostic slave port, responsible
- * only for the structural connection to a master port.
- */
-class BaseSlavePort : public Port
-{
-  protected:
-    BaseMasterPort *_baseMasterPort;
-
-    BaseSlavePort(const std::string &name, PortID id=InvalidPortID);
-    virtual ~BaseSlavePort();
-
-  public:
-    BaseMasterPort& getMasterPort() const;
-    void bind(Port &peer) override;
-    void unbind() override;
-};
-
 /** Forward declaration */
 class SlavePort;
 
@@ -113,7 +72,7 @@ class SlavePort;
  * The three protocols are atomic, timing, and functional, each with its own
  * header file.
  */
-class MasterPort : public BaseMasterPort, public AtomicRequestProtocol,
+class MasterPort : public Port, public AtomicRequestProtocol,
     public TimingRequestProtocol, public FunctionalRequestProtocol
 {
     friend class SlavePort;
@@ -296,7 +255,7 @@ class MasterPort : public BaseMasterPort, public AtomicRequestProtocol,
  * The three protocols are atomic, timing, and functional, each with its own
  * header file.
  */
-class SlavePort : public BaseSlavePort, public AtomicResponseProtocol,
+class SlavePort : public Port, public AtomicResponseProtocol,
     public TimingResponseProtocol, public FunctionalResponseProtocol
 {
     friend class MasterPort;