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/*
* Copyright 2018 Google, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Gabe Black
*/
#ifndef __SYSTEMC_EXT_CHANNEL_SC_SIGNAL_HH__
#define __SYSTEMC_EXT_CHANNEL_SC_SIGNAL_HH__
#include <iostream>
#include <string>
#include <vector>
#include "../core/sc_event.hh"
#include "../core/sc_module.hh" // for sc_gen_unique_name
#include "../core/sc_prim.hh"
#include "../dt/bit/sc_logic.hh"
#include "sc_signal_inout_if.hh"
#include "warn_unimpl.hh" // for warn_unimpl
namespace sc_core
{
class sc_port_base;
template <class T, sc_writer_policy WRITER_POLICY=SC_ONE_WRITER>
class sc_signal : public sc_signal_inout_if<T>,
public sc_prim_channel
{
public:
sc_signal() : sc_signal_inout_if<T>(),
sc_prim_channel(sc_gen_unique_name("signal")),
m_cur_val(T()), m_new_val(T()), _changeStamp(~0ULL)
{}
explicit sc_signal(const char *name) :
sc_signal_inout_if<T>(), sc_prim_channel(name),
m_cur_val(T()), m_new_val(T()), _changeStamp(~0ULL)
{}
explicit sc_signal(const char *name, const T &initial_value) :
sc_signal_inout_if<T>(), sc_prim_channel(name),
m_cur_val(initial_value), m_new_val(initial_value), _changeStamp(~0ULL)
{}
virtual ~sc_signal() {}
virtual void
register_port(sc_port_base &, const char *)
{
sc_channel_warn_unimpl(__PRETTY_FUNCTION__);
}
virtual const T &read() const { return m_cur_val; }
operator const T&() const { return read(); }
virtual sc_writer_policy
get_writer_policy() const
{
return WRITER_POLICY;
}
virtual void
write(const T &t)
{
m_new_val = t;
bool changed = !(m_cur_val == m_new_val);
//TODO check whether this write follows the write policy.
if (changed)
request_update();
}
sc_signal<T, WRITER_POLICY> &
operator = (const T &t)
{
write(t);
return *this;
}
sc_signal<T, WRITER_POLICY> &
operator = (const sc_signal<T, WRITER_POLICY> &s)
{
write(s.read());
return *this;
}
virtual const sc_event &
default_event() const
{
return value_changed_event();
}
virtual const sc_event &
value_changed_event() const
{
return _valueChangedEvent;
}
virtual bool
event() const
{
return _changeStamp == ::sc_gem5::getChangeStamp();
}
virtual void print(std::ostream &os=std::cout) const { os << m_cur_val; }
virtual void
dump(std::ostream &os=std::cout) const
{
os << " name = " << name() << ::std::endl;
os << " value = " << m_cur_val << ::std::endl;
os << "new value = " << m_new_val << ::std::endl;
}
virtual const char *kind() const { return "sc_signal"; }
protected:
virtual void
update()
{
if (m_new_val == m_cur_val)
return;
m_cur_val = m_new_val;
_signalChange();
_changeStamp = ::sc_gem5::getChangeStamp();
_valueChangedEvent.notify(SC_ZERO_TIME);
}
void
_signalChange()
{
_changeStamp = ::sc_gem5::getChangeStamp();
_valueChangedEvent.notify(SC_ZERO_TIME);
}
// These members which store the current and future value of the signal
// are not specified in the standard but are referred to directly by one
// of the tests.
T m_cur_val;
T m_new_val;
private:
sc_event _valueChangedEvent;
uint64_t _changeStamp;
// Disabled
sc_signal(const sc_signal<T, WRITER_POLICY> &) :
sc_signal_inout_if<T>(), sc_prim_channel("")
{}
};
template <class T, sc_writer_policy WRITER_POLICY>
inline std::ostream &
operator << (std::ostream &os, const sc_signal<T, WRITER_POLICY> &s)
{
os << s.read();
return os;
}
template <sc_writer_policy WRITER_POLICY>
class sc_signal<bool, WRITER_POLICY> :
public sc_signal_inout_if<bool>, public sc_prim_channel
{
public:
sc_signal() : sc_signal_inout_if<bool>(),
sc_prim_channel(sc_gen_unique_name("signal")),
m_cur_val(bool()), m_new_val(bool()),
_changeStamp(~0ULL), _posStamp(~0ULL), _negStamp(~0ULL)
{}
explicit sc_signal(const char *name) :
sc_signal_inout_if<bool>(), sc_prim_channel(name),
m_cur_val(bool()), m_new_val(bool()),
_changeStamp(~0ULL), _posStamp(~0ULL), _negStamp(~0ULL)
{}
explicit sc_signal(const char *name, const bool &initial_value) :
sc_signal_inout_if<bool>(), sc_prim_channel(name),
m_cur_val(initial_value), m_new_val(initial_value),
_changeStamp(~0ULL), _posStamp(~0ULL), _negStamp(~0ULL)
{}
virtual ~sc_signal() {}
virtual void
register_port(sc_port_base &, const char *)
{
sc_channel_warn_unimpl(__PRETTY_FUNCTION__);
}
virtual const bool &read() const { return m_cur_val; }
operator const bool &() const { return read(); }
virtual sc_writer_policy
get_writer_policy() const
{
return WRITER_POLICY;
}
virtual void
write(const bool &b)
{
m_new_val = b;
bool changed = !(m_cur_val == m_new_val);
//TODO check whether this write follows the write policy.
if (changed)
request_update();
}
sc_signal<bool, WRITER_POLICY> &
operator = (const bool &b)
{
write(b);
return *this;
}
sc_signal<bool, WRITER_POLICY> &
operator = (const sc_signal<bool, WRITER_POLICY> &s)
{
write(s.read());
return *this;
}
virtual const sc_event &
default_event() const
{
return value_changed_event();
}
virtual const sc_event &
value_changed_event() const
{
return _valueChangedEvent;
}
virtual const sc_event &
posedge_event() const
{
return _posedgeEvent;
}
virtual const sc_event &
negedge_event() const
{
return _negedgeEvent;
}
virtual bool
event() const
{
return _changeStamp == ::sc_gem5::getChangeStamp();
}
virtual bool
posedge() const
{
return _posStamp == ::sc_gem5::getChangeStamp();
}
virtual bool
negedge() const
{
return _negStamp == ::sc_gem5::getChangeStamp();
}
virtual void print(std::ostream &os=std::cout) const { os << m_cur_val; }
virtual void
dump(std::ostream &os=std::cout) const
{
os << " name = " << name() << ::std::endl;
os << " value = " << m_cur_val << ::std::endl;
os << "new value = " << m_new_val << ::std::endl;
}
virtual const char *kind() const { return "sc_signal"; }
protected:
virtual void
update()
{
if (m_new_val == m_cur_val)
return;
m_cur_val = m_new_val;
_signalChange();
if (m_cur_val) {
_posStamp = ::sc_gem5::getChangeStamp();
_posedgeEvent.notify(SC_ZERO_TIME);
} else {
_negStamp = ::sc_gem5::getChangeStamp();
_negedgeEvent.notify(SC_ZERO_TIME);
}
}
void
_signalChange()
{
_changeStamp = ::sc_gem5::getChangeStamp();
_valueChangedEvent.notify(SC_ZERO_TIME);
}
bool m_cur_val;
bool m_new_val;
private:
sc_event _valueChangedEvent;
sc_event _posedgeEvent;
sc_event _negedgeEvent;
uint64_t _changeStamp;
uint64_t _posStamp;
uint64_t _negStamp;
// Disabled
sc_signal(const sc_signal<bool, WRITER_POLICY> &) :
sc_signal_inout_if<bool>(), sc_prim_channel("")
{}
};
template <sc_writer_policy WRITER_POLICY>
class sc_signal<sc_dt::sc_logic, WRITER_POLICY> :
public sc_signal_inout_if<sc_dt::sc_logic>, public sc_prim_channel
{
public:
sc_signal() : sc_signal_inout_if<sc_dt::sc_logic>(),
sc_prim_channel(sc_gen_unique_name("signal")),
m_cur_val(sc_dt::sc_logic()), m_new_val(sc_dt::sc_logic()),
_changeStamp(~0ULL), _posStamp(~0ULL), _negStamp(~0ULL)
{}
explicit sc_signal(const char *name) :
sc_signal_inout_if<sc_dt::sc_logic>(), sc_prim_channel(name),
m_cur_val(sc_dt::sc_logic()), m_new_val(sc_dt::sc_logic()),
_changeStamp(~0ULL), _posStamp(~0ULL), _negStamp(~0ULL)
{}
explicit sc_signal(const char *name,
const sc_dt::sc_logic &initial_value) :
sc_signal_inout_if<sc_dt::sc_logic>(), sc_prim_channel(name),
m_cur_val(initial_value), m_new_val(initial_value),
_changeStamp(~0ULL), _posStamp(~0ULL), _negStamp(~0ULL)
{}
virtual ~sc_signal() {}
virtual void
register_port(sc_port_base &, const char *)
{
sc_channel_warn_unimpl(__PRETTY_FUNCTION__);
}
virtual const sc_dt::sc_logic &read() const { return m_cur_val; }
operator const sc_dt::sc_logic &() const { return read(); }
virtual sc_writer_policy
get_writer_policy() const
{
return WRITER_POLICY;
}
virtual void
write(const sc_dt::sc_logic &l)
{
m_new_val = l;
bool changed = !(m_cur_val == m_new_val);
//TODO check whether this write follows the write policy.
if (changed)
request_update();
}
sc_signal<sc_dt::sc_logic, WRITER_POLICY> &
operator = (const sc_dt::sc_logic &l)
{
write(l);
return *this;
}
sc_signal<sc_dt::sc_logic, WRITER_POLICY> &
operator = (const sc_signal<sc_dt::sc_logic, WRITER_POLICY> &s)
{
write(s.read());
return *this;
}
virtual const sc_event &
default_event() const
{
return value_changed_event();
}
virtual const sc_event &
value_changed_event() const
{
return _valueChangedEvent;
}
virtual const sc_event &
posedge_event() const
{
return _posedgeEvent;
}
virtual const sc_event &
negedge_event() const
{
return _negedgeEvent;
}
virtual bool
event() const
{
return _changeStamp == ::sc_gem5::getChangeStamp();
}
virtual bool
posedge() const
{
return _posStamp == ::sc_gem5::getChangeStamp();
}
virtual bool
negedge() const
{
return _negStamp == ::sc_gem5::getChangeStamp();
}
virtual void print(std::ostream &os=std::cout) const { os << m_cur_val; }
virtual void
dump(std::ostream &os=std::cout) const
{
os << " name = " << name() << ::std::endl;
os << " value = " << m_cur_val << ::std::endl;
os << "new value = " << m_new_val << ::std::endl;
}
virtual const char *kind() const { return "sc_signal"; }
protected:
virtual void
update()
{
if (m_new_val == m_cur_val)
return;
m_cur_val = m_new_val;
_signalChange();
if (m_cur_val == sc_dt::SC_LOGIC_1) {
_posStamp = ::sc_gem5::getChangeStamp();
_posedgeEvent.notify(SC_ZERO_TIME);
} else if (m_cur_val == sc_dt::SC_LOGIC_0) {
_negStamp = ::sc_gem5::getChangeStamp();
_negedgeEvent.notify(SC_ZERO_TIME);
}
}
void
_signalChange()
{
_changeStamp = ::sc_gem5::getChangeStamp();
_valueChangedEvent.notify(SC_ZERO_TIME);
}
sc_dt::sc_logic m_cur_val;
sc_dt::sc_logic m_new_val;
private:
sc_event _valueChangedEvent;
sc_event _posedgeEvent;
sc_event _negedgeEvent;
uint64_t _changeStamp;
uint64_t _posStamp;
uint64_t _negStamp;
// Disabled
sc_signal(const sc_signal<sc_dt::sc_logic, WRITER_POLICY> &) :
sc_signal_inout_if<sc_dt::sc_logic>(), sc_prim_channel("")
{}
};
} // namespace sc_core
#endif //__SYSTEMC_EXT_CHANNEL_SC_SIGNAL_HH__
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