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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_CORE_PROCESS_HH__
#define __SYSTEMC_CORE_PROCESS_HH__
#include <functional>
#include <vector>
#include "base/fiber.hh"
#include "sim/eventq.hh"
#include "systemc/core/bindinfo.hh"
#include "systemc/core/list.hh"
#include "systemc/core/object.hh"
#include "systemc/ext/core/sc_event.hh"
#include "systemc/ext/core/sc_export.hh"
#include "systemc/ext/core/sc_interface.hh"
#include "systemc/ext/core/sc_module.hh"
#include "systemc/ext/core/sc_port.hh"
#include "systemc/ext/core/sc_process_handle.hh"
namespace sc_gem5
{
class Sensitivity
{
protected:
Process *process;
public:
Sensitivity(Process *p) : process(p) {}
virtual ~Sensitivity() {}
virtual void notifyWork(Event *e);
void notify(Event *e);
void notify() { notify(nullptr); }
const std::string name();
};
class SensitivityTimeout : virtual public Sensitivity
{
private:
void timeout();
EventWrapper<SensitivityTimeout,
&SensitivityTimeout::timeout> timeoutEvent;
::sc_core::sc_time time;
public:
SensitivityTimeout(Process *p, ::sc_core::sc_time t);
~SensitivityTimeout();
};
class SensitivityEvent : virtual public Sensitivity
{
private:
const ::sc_core::sc_event *event;
public:
SensitivityEvent(Process *p, const ::sc_core::sc_event *e);
~SensitivityEvent();
};
//XXX This sensitivity can't be reused. To reset it, it has to be deleted and
//recreated. That works for dynamic sensitivities, but not for static.
//Fortunately processes can't be statically sensitive to sc_event_and_lists.
class SensitivityEventAndList : virtual public Sensitivity
{
private:
const ::sc_core::sc_event_and_list *list;
int count;
public:
SensitivityEventAndList(
Process *p, const ::sc_core::sc_event_and_list *list);
~SensitivityEventAndList();
void notifyWork(Event *e) override;
};
class SensitivityEventOrList : virtual public Sensitivity
{
private:
const ::sc_core::sc_event_or_list *list;
public:
SensitivityEventOrList(
Process *p, const ::sc_core::sc_event_or_list *list);
~SensitivityEventOrList();
};
// Combined sensitivities. These trigger when any of their parts do.
class SensitivityTimeoutAndEvent :
public SensitivityTimeout, public SensitivityEvent
{
public:
SensitivityTimeoutAndEvent(
Process *p, ::sc_core::sc_time t, const ::sc_core::sc_event *e) :
Sensitivity(p), SensitivityTimeout(p, t), SensitivityEvent(p, e)
{}
};
class SensitivityTimeoutAndEventAndList :
public SensitivityTimeout, public SensitivityEventAndList
{
public:
SensitivityTimeoutAndEventAndList(
Process *p, ::sc_core::sc_time t,
const ::sc_core::sc_event_and_list *eal) :
Sensitivity(p), SensitivityTimeout(p, t),
SensitivityEventAndList(p, eal)
{}
};
class SensitivityTimeoutAndEventOrList :
public SensitivityTimeout, public SensitivityEventOrList
{
public:
SensitivityTimeoutAndEventOrList(
Process *p, ::sc_core::sc_time t,
const ::sc_core::sc_event_or_list *eol) :
Sensitivity(p), SensitivityTimeout(p, t),
SensitivityEventOrList(p, eol)
{}
};
typedef std::vector<Sensitivity *> Sensitivities;
/*
* Pending sensitivities. These are records of sensitivities to install later,
* once all the information to configure them is available.
*/
class PendingSensitivity
{
protected:
Process *process;
public:
virtual void finalize(Sensitivities &s) = 0;
PendingSensitivity(Process *p) : process(p) {}
virtual ~PendingSensitivity() {}
};
class PendingSensitivityEvent : public PendingSensitivity
{
private:
const sc_core::sc_event *event;
public:
PendingSensitivityEvent(Process *p, const sc_core::sc_event *e) :
PendingSensitivity(p), event(e) {}
void
finalize(Sensitivities &s) override
{
s.push_back(new SensitivityEvent(process, event));
}
};
class PendingSensitivityInterface : public PendingSensitivity
{
private:
const sc_core::sc_interface *interface;
public:
PendingSensitivityInterface(Process *p, const sc_core::sc_interface *i) :
PendingSensitivity(p), interface(i)
{}
void
finalize(Sensitivities &s) override
{
s.push_back(new SensitivityEvent(process,
&interface->default_event()));
}
};
class PendingSensitivityPort : public PendingSensitivity
{
private:
const sc_core::sc_port_base *port;
public:
PendingSensitivityPort(Process *p, const sc_core::sc_port_base *pb) :
PendingSensitivity(p), port(pb)
{}
void
finalize(Sensitivities &s) override
{
for (int i = 0; i < port->size(); i++) {
const ::sc_core::sc_event *e =
&port->_gem5BindInfo[i]->interface->default_event();
s.push_back(new SensitivityEvent(process, e));
}
}
};
class PendingSensitivityExport : public PendingSensitivity
{
private:
const sc_core::sc_export_base *exp;
public:
PendingSensitivityExport(Process *p, const sc_core::sc_export_base *exp) :
PendingSensitivity(p), exp(exp)
{}
void
finalize(Sensitivities &s) override
{
s.push_back(new SensitivityEvent(process,
&exp->get_interface()->default_event()));
}
};
class PendingSensitivityFinder : public PendingSensitivity
{
private:
const sc_core::sc_event_finder *finder;
public:
PendingSensitivityFinder(Process *p, const sc_core::sc_event_finder *f) :
PendingSensitivity(p), finder(f)
{}
void
finalize(Sensitivities &s) override
{
s.push_back(new SensitivityEvent(process, &finder->find_event()));
}
};
typedef std::vector<PendingSensitivity *> PendingSensitivities;
class Process : public ::sc_core::sc_object, public ListNode
{
public:
virtual ::sc_core::sc_curr_proc_kind procKind() const = 0;
bool needsStart() const { return _needsStart; }
bool dynamic() const { return _dynamic; }
bool isUnwinding() const { return _isUnwinding; }
bool terminated() const { return _terminated; }
void forEachKid(const std::function<void(Process *)> &work);
bool suspended() const { return _suspended; }
bool disabled() const { return _disabled; }
void suspend(bool inc_kids);
void resume(bool inc_kids);
void disable(bool inc_kids);
void enable(bool inc_kids);
void kill(bool inc_kids);
void reset(bool inc_kids);
virtual void throw_it(ExceptionWrapperBase &exc, bool inc_kids);
void injectException(ExceptionWrapperBase &exc);
ExceptionWrapperBase *excWrapper;
void syncResetOn(bool inc_kids);
void syncResetOff(bool inc_kids);
void incref() { refCount++; }
void decref() { refCount--; }
const ::sc_core::sc_event &resetEvent() { return _resetEvent; }
const ::sc_core::sc_event &terminatedEvent() { return _terminatedEvent; }
// This should only be called before initialization.
void dontInitialize();
void setStackSize(size_t size) { stackSize = size; }
void finalize();
void run();
void addStatic(PendingSensitivity *);
void setDynamic(Sensitivity *);
void satisfySensitivity(Sensitivity *);
void ready();
virtual Fiber *fiber() { return Fiber::primaryFiber(); }
static Process *newest() { return _newest; }
protected:
Process(const char *name, ProcessFuncWrapper *func, bool _dynamic,
bool needs_start);
static Process *_newest;
virtual ~Process()
{
delete func;
for (auto s: staticSensitivities)
delete s;
}
::sc_core::sc_event _resetEvent;
::sc_core::sc_event _terminatedEvent;
ProcessFuncWrapper *func;
sc_core::sc_curr_proc_kind _procKind;
bool _needsStart;
bool _dynamic;
bool _isUnwinding;
bool _terminated;
bool _suspended;
bool _suspendedReady;
bool _disabled;
bool _syncReset;
int refCount;
size_t stackSize;
Sensitivities staticSensitivities;
PendingSensitivities pendingStaticSensitivities;
Sensitivity *dynamicSensitivity;
};
inline void
Sensitivity::notifyWork(Event *e)
{
process->satisfySensitivity(this);
}
inline void
Sensitivity::notify(Event *e)
{
if (!process->disabled())
notifyWork(e);
}
inline const std::string
Sensitivity::name()
{
return std::string(process->name()) + ".timeout";
}
} // namespace sc_gem5
#endif //__SYSTEMC_CORE_PROCESS_HH__
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