sc_port_wrapper.hh

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#ifndef __SYSTEMC_SC_PORT_WRAPPER_HH__
#define __SYSTEMC_SC_PORT_WRAPPER_HH__
 
#include <string>
#include <type_traits>
 
#include "base/logging.hh"
#include "sim/port.hh"
#include "systemc/ext/core/sc_export.hh"
#include "systemc/ext/core/sc_interface.hh"
#include "systemc/ext/core/sc_port.hh"
 
namespace sc_gem5
{
 
// Forward declaration
template <typename IF>
class ScPortWrapper;
template <typename IF>
class ScInterfaceWrapper;
template <typename IF>
class ScExportWrapper;
 
template <typename IF>
class ScPortWrapper : public gem5::Port
{
  public:
    using ScPort = sc_core::sc_port_b<IF>;
 
    ScPortWrapper(ScPort& p, const std::string& name, gem5::PortID id)
        : gem5::Port(name, id), port_(p)
    {}
 
    ScPort&
    port()
    {
        return port_;
    }
 
    void
    unbind() override
    {
        using namespace gem5;
 
        panic("sc_port can't be unbound.");
    }
 
    void
    bind(gem5::Port& peer) override
    {
        using namespace gem5;
 
        // Try ScPortWrapper or ScInterfaceWrapper
        if (auto* beer = dynamic_cast<ScPortWrapper<IF>*>(&peer)) {
            port_.bind(beer->port());
        } else if (auto* iface =
                       dynamic_cast<ScInterfaceWrapper<IF>*>(&peer)) {
            port_.bind(iface->interface());
        } else {
            fatal("Attempt to bind sc_port %s to incompatible port %s.",
                  name(), peer.name());
        }
        gem5::Port::bind(peer);
    }
 
  private:
    ScPort& port_;
};
 
template <typename IF>
class ScInterfaceWrapper : public gem5::Port
{
  public:
    ScInterfaceWrapper(IF& i, const std::string name, gem5::PortID id)
        : gem5::Port(name, id), iface_(i)
    {}
 
    IF&
    interface()
    {
        return iface_;
    }
 
    void
    unbind() override
    {
        using namespace gem5;
 
        panic("sc_interface can't be unbound.");
    }
 
    void
    bind(gem5::Port& peer) override
    {
        using namespace gem5;
 
        // fatal error if peer is neither ScPortWrapper nor ScExportWrapper
        fatal_if(!dynamic_cast<ScPortWrapper<IF>*>(&peer) &&
                     !dynamic_cast<ScExportWrapper<IF>*>(&peer),
                 "Attempt to bind sc_interface %s to incompatible port %s.",
                 name(), peer.name());
 
        // Don't bind to peer otherwise we may have error messages saying that
        // this interface has already be bound since the peer may already did
        // that. Just let sc_port or sc_export do the binding
        gem5::Port::bind(peer);
    }
 
  private:
    IF& iface_;
};
 
template <typename IF>
class ScExportWrapper : public gem5::Port
{
  public:
    using ScExport = sc_core::sc_export<IF>;
 
    ScExportWrapper(ScExport& p, const std::string& name, gem5::PortID id)
        : gem5::Port(name, id), port_(p)
    {}
 
    ScExport&
    port()
    {
        return port_;
    }
 
    void
    unbind() override
    {
        using namespace gem5;
 
        panic("sc_export cannot be unbound.");
    }
 
    void
    bind(gem5::Port& peer) override
    {
        using namespace gem5;
 
        auto* iface = dynamic_cast<ScInterfaceWrapper<IF>*>(&peer);
        fatal_if(!iface,
                 "Attempt to bind sc_export %s to incompatible port %s.",
                 name(), peer.name());
 
        port_.bind(iface->interface());
        gem5::Port::bind(peer);
    }
 
  private:
    ScExport& port_;
};
 
}  // namespace sc_gem5
 
#endif  // __SYSTEMC_SC_PORT_WRAPPER_HH__