event.cc

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/*
 * Copyright (c) 2017 ARM Limited
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 *
 * The license below extends only to copyright in the software and shall
 * not be construed as granting a license to any other intellectual
 * property including but not limited to intellectual property relating
 * to a hardware implementation of the functionality of the software
 * licensed hereunder.  You may use the software subject to the license
 * terms below provided that you ensure that this notice is replicated
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 * modified or unmodified, in source code or in binary form.
 *
 * Copyright (c) 2006 The Regents of The University of Michigan
 * Copyright (c) 2013 Advanced Micro Devices, Inc.
 * Copyright (c) 2013 Mark D. Hill and David A. Wood
 * All rights reserved.
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#include "pybind11/pybind11.h"
#include "pybind11/stl.h"
 
#include "base/logging.hh"
#include "sim/eventq.hh"
#include "sim/sim_events.hh"
#include "sim/sim_exit.hh"
#include "sim/simulate.hh"
 
namespace py = pybind11;
 
 
class PyEvent : public Event
{
  public:
    PyEvent(Event::Priority priority)
        : Event(priority, Event::Managed)
    {
    }
 
    void process() override {
        // Call the Python implementation as __call__. This provides a
        // slightly more Python-friendly interface.
        PYBIND11_OVERLOAD_PURE_NAME(void, PyEvent, "__call__", process);
    }
 
  protected:
    void acquireImpl() override {
        py::object obj = py::cast(this);
 
        if (obj) {
            obj.inc_ref();
        } else {
            panic("Failed to get PyBind object to increase ref count\n");
        }
    }
 
    void releaseImpl() override {
        py::object obj = py::cast(this);
 
        if (obj) {
            obj.dec_ref();
        } else {
            panic("Failed to get PyBind object to decrease ref count\n");
        }
    }
};
 
void
pybind_init_event(py::module &m_native)
{
    py::module m = m_native.def_submodule("event");
 
    m.def("simulate", &simulate,
          py::arg("ticks") = MaxTick);
    m.def("exitSimLoop", &exitSimLoop);
    m.def("getEventQueue", []() { return curEventQueue(); },
          py::return_value_policy::reference);
    m.def("setEventQueue", [](EventQueue *q) { return curEventQueue(q); });
    m.def("getEventQueue", &getEventQueue,
          py::return_value_policy::reference);
 
    py::class_<EventQueue>(m, "EventQueue")
        .def("name",  [](EventQueue *eq) { return eq->name(); })
        .def("dump", &EventQueue::dump)
        .def("schedule", [](EventQueue *eq, PyEvent *e, Tick t) {
                eq->schedule(e, t);
            }, py::arg("event"), py::arg("when"))
        .def("deschedule", &EventQueue::deschedule,
             py::arg("event"))
        .def("reschedule", &EventQueue::reschedule,
             py::arg("event"), py::arg("tick"), py::arg("always") = false)
        ;
 
    // TODO: Ownership of global exit events has always been a bit
    // questionable. We currently assume they are owned by the C++
    // world. This is what the old SWIG code did, but that will result
    // in memory leaks.
    py::class_<GlobalSimLoopExitEvent,
               std::unique_ptr<GlobalSimLoopExitEvent, py::nodelete>>(
               m, "GlobalSimLoopExitEvent")
        .def("getCause", &GlobalSimLoopExitEvent::getCause)
#if PY_MAJOR_VERSION >= 3
        .def("getCode", &GlobalSimLoopExitEvent::getCode)
#else
        // Workaround for an issue where PyBind11 converts the exit
        // code to a long. This is normally fine, but sys.exit treats
        // any non-int type as an error and exits with status 1 if it
        // is passed a long.
        .def("getCode", [](GlobalSimLoopExitEvent *e) {
                return py::reinterpret_steal<py::object>(
                    PyInt_FromLong(e->getCode()));
            })
#endif
        ;
 
    // Event base class. These should never be returned directly to
    // Python since they don't have a well-defined life cycle. Python
    // events should be derived from PyEvent instead.
    py::class_<Event> c_event(
        m, "Event");
    c_event
        .def("name", &Event::name)
        .def("dump", &Event::dump)
        .def("scheduled", &Event::scheduled)
        .def("squash", &Event::squash)
        .def("squashed", &Event::squashed)
        .def("isExitEvent", &Event::isExitEvent)
        .def("when", &Event::when)
        .def("priority", &Event::priority)
        ;
 
    py::class_<PyEvent, Event>(m, "PyEvent")
        .def(py::init<Event::Priority>(),
             py::arg("priority") = (int)Event::Default_Pri)
        ;
 
#define PRIO(n) c_event.attr(# n) = py::cast((int)Event::n)
    PRIO(Minimum_Pri);
    PRIO(Minimum_Pri);
    PRIO(Debug_Enable_Pri);
    PRIO(Debug_Break_Pri);
    PRIO(CPU_Switch_Pri);
    PRIO(Delayed_Writeback_Pri);
    PRIO(Default_Pri);
    PRIO(DVFS_Update_Pri);
    PRIO(Serialize_Pri);
    PRIO(CPU_Tick_Pri);
    PRIO(Stat_Event_Pri);
    PRIO(Progress_Event_Pri);
    PRIO(Sim_Exit_Pri);
    PRIO(Maximum_Pri);
}