1/*
2 * Copyright (c) 2017 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software

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41 *
42 * Authors: Nathan Binkert
43 * Andreas Sandberg
44 */
45
46#include "pybind11/pybind11.h"
47#include "pybind11/stl.h"
48
49#include "sim/eventq.hh"
50#include "sim/sim_events.hh"
51#include "sim/sim_exit.hh"
52#include "sim/simulate.hh"
53
54namespace py = pybind11;
55
56/**
57 * PyBind wrapper for Events
58 *
59 * We need to wrap the Event class with some Python glue code to
60 * enable method overrides in Python and memory management. Unlike its
61 * C++ cousin, PyEvents need to override __call__ instead of
62 * Event::process().
63 *
64 * Memory management is mostly done using reference counting in
65 * Python. However, PyBind can't keep track of the reference the event
66 * queue holds to a scheduled event. We therefore need to inhibit
67 * deletion and hand over ownership to the event queue in case a
68 * scheduled event loses all of its Python references.
69 */
70class PyEvent : public Event
71{
72 public:
73 struct Deleter {
74 void operator()(PyEvent *ev) {
75 assert(!ev->isAutoDelete());
76 if (ev->scheduled()) {
77 // The event is scheduled, give ownership to the event
78 // queue.
79 ev->setFlags(Event::AutoDelete);
80 } else {
81 // The event isn't scheduled, hence Python owns it and
82 // we need to free it here.
83 delete ev;
84 }
85 }
86 };
87
88 PyEvent(Event::Priority priority)
89 : Event(priority)
90 { }
91
92 void process() override {
93 if (isAutoDelete()) {
94 // Ownership of the event was handed over to the event queue
95 // because the last revference in Python land was GCed. We
96 // need to claim the object again since we're creating a new
97 // Python reference.
98 clearFlags(AutoDelete);
99 }
100
101 // Call the Python implementation as __call__. This provides a
102 // slightly more Python-friendly interface.
103 PYBIND11_OVERLOAD_PURE_NAME(void, PyEvent, "__call__", process);
104 }
105};
106
107void
108pybind_init_event(py::module &m_native)
109{
110 py::module m = m_native.def_submodule("event");
111
112 m.def("simulate", &simulate,

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119 py::return_value_policy::reference);
120
121 py::class_<EventQueue>(m, "EventQueue")
122 .def("name", [](EventQueue *eq) { return eq->name(); })
123 .def("dump", &EventQueue::dump)
124 .def("schedule", [](EventQueue *eq, PyEvent *e, Tick t) {
125 eq->schedule(e, t);
126 }, py::arg("event"), py::arg("when"))
127 .def("deschedule", [](EventQueue *eq, PyEvent *e) {
128 eq->deschedule(e);
129 }, py::arg("event"))
130 .def("reschedule", [](EventQueue *eq, PyEvent *e, Tick t, bool alw) {
131 eq->reschedule(e, t, alw);
132 }, py::arg("event"), py::arg("tick"), py::arg("always") = false)
133 ;
134
135 // TODO: Ownership of global exit events has always been a bit
136 // questionable. We currently assume they are owned by the C++
137 // word. This is what the old SWIG code did, but that will result
138 // in memory leaks.
139 py::class_<GlobalSimLoopExitEvent,
140 std::unique_ptr<GlobalSimLoopExitEvent, py::nodelete>>(
141 m, "GlobalSimLoopExitEvent")
142 .def("getCause", &GlobalSimLoopExitEvent::getCause)
143 .def("getCode", &GlobalSimLoopExitEvent::getCode)
144 ;
145
146 // TODO: We currently export a wrapper class and not the Event
147 // base class. This wil be problematic if we ever return an event
148 // from C++.
149 py::class_<PyEvent, std::unique_ptr<PyEvent, PyEvent::Deleter>>
150 c_event(m, "Event");
151 c_event
152 .def(py::init<Event::Priority>(),
153 py::arg("priority") = (int)Event::Default_Pri)
154 .def("name", &Event::name)
155 .def("dump", &Event::dump)
156 .def("scheduled", &Event::scheduled)
157 .def("squash", &Event::squash)
158 .def("squashed", &Event::squashed)
159 .def("isExitEvent", &Event::isExitEvent)
160 .def("isAutoDelete", &Event::isAutoDelete)
161 .def("when", &Event::when)
162 .def("priority", &Event::priority)
163 ;
164
165#define PRIO(n) c_event.attr(# n) = py::cast((int)Event::n)
166 PRIO(Minimum_Pri);
167 PRIO(Minimum_Pri);
168 PRIO(Debug_Enable_Pri);
169 PRIO(Debug_Break_Pri);
170 PRIO(CPU_Switch_Pri);
171 PRIO(Delayed_Writeback_Pri);
172 PRIO(Default_Pri);
173 PRIO(DVFS_Update_Pri);
174 PRIO(Serialize_Pri);
175 PRIO(CPU_Tick_Pri);
176 PRIO(Stat_Event_Pri);
177 PRIO(Progress_Event_Pri);
178 PRIO(Sim_Exit_Pri);
179 PRIO(Maximum_Pri);
180}