event.cc revision 13179 
1/*
2 * Copyright 2018 Google, Inc.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met: redistributions of source code must retain the above copyright
7 * notice, this list of conditions and the following disclaimer;
8 * redistributions in binary form must reproduce the above copyright
9 * notice, this list of conditions and the following disclaimer in the
10 * documentation and/or other materials provided with the distribution;
11 * neither the name of the copyright holders nor the names of its
12 * contributors may be used to endorse or promote products derived from
13 * this software without specific prior written permission.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
18 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
19 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
21 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
25 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 *
27 * Authors: Gabe Black
28 */
29
30#include "systemc/core/event.hh"
31
32#include <algorithm>
33#include <cstring>
34#include <utility>
35
36#include "base/logging.hh"
37#include "sim/core.hh"
38#include "systemc/core/module.hh"
39#include "systemc/core/scheduler.hh"
40#include "systemc/ext/core/sc_main.hh"
41#include "systemc/ext/core/sc_module.hh"
42
43namespace sc_gem5
44{
45
46Event::Event(sc_core::sc_event *_sc_event) : Event(_sc_event, nullptr) {}
47
48Event::Event(sc_core::sc_event *_sc_event, const char *_basename_cstr) :
49    _sc_event(_sc_event), _basename(_basename_cstr ? _basename_cstr : ""),
50    delayedNotify([this]() { this->notify(); })
51{
52    Module *p = currentModule();
53
54    if (_basename == "" && ::sc_core::sc_is_running())
55        _basename = ::sc_core::sc_gen_unique_name("event");
56
57    if (p)
58        parent = p->obj()->sc_obj();
59    else if (scheduler.current())
60        parent = scheduler.current();
61    else
62        parent = nullptr;
63
64    std::string original_name = _basename;
65    _basename = pickUniqueName(parent, _basename);
66
67    if (parent) {
68        Object *obj = Object::getFromScObject(parent);
69        obj->addChildEvent(_sc_event);
70    } else {
71        topLevelEvents.emplace(topLevelEvents.end(), _sc_event);
72    }
73
74    std::string path = parent ? (std::string(parent->name()) + ".") : "";
75
76    if (original_name != "" && _basename != original_name) {
77        std::string message = path + original_name +
78            ". Latter declaration will be renamed to " +
79            path + _basename;
80        SC_REPORT_WARNING("(W505) object already exists", message.c_str());
81    }
82
83    _name = path + _basename;
84
85    allEvents.emplace(allEvents.end(), _sc_event);
86
87    // Determine if we're in the hierarchy (created once initialization starts
88    // means no).
89}
90
91Event::~Event()
92{
93    if (parent) {
94        Object *obj = Object::getFromScObject(parent);
95        obj->delChildEvent(_sc_event);
96    } else {
97        EventsIt it = find(topLevelEvents.begin(), topLevelEvents.end(),
98                           _sc_event);
99        assert(it != topLevelEvents.end());
100        std::swap(*it, topLevelEvents.back());
101        topLevelEvents.pop_back();
102    }
103
104    EventsIt it = findEvent(_name);
105    std::swap(*it, allEvents.back());
106    allEvents.pop_back();
107
108    if (delayedNotify.scheduled())
109        scheduler.deschedule(&delayedNotify);
110}
111
112const std::string &
113Event::name() const
114{
115    return _name;
116}
117
118const std::string &
119Event::basename() const
120{
121    return _basename;
122}
123
124bool
125Event::inHierarchy() const
126{
127    return _name.length() != 0;
128}
129
130sc_core::sc_object *
131Event::getParentObject() const
132{
133    return parent;
134}
135
136void
137Event::notify()
138{
139    // An immediate notification overrides any pending delayed notification.
140    if (delayedNotify.scheduled())
141        scheduler.deschedule(&delayedNotify);
142
143    auto local_sensitivities = sensitivities;
144    for (auto s: local_sensitivities)
145        s->notify(this);
146}
147
148void
149Event::notify(const sc_core::sc_time &t)
150{
151    if (delayedNotify.scheduled()) {
152        if (scheduler.delayed(t) >= delayedNotify.when())
153            return;
154
155        scheduler.deschedule(&delayedNotify);
156    }
157    scheduler.schedule(&delayedNotify, t);
158}
159
160void
161Event::cancel()
162{
163    if (delayedNotify.scheduled())
164        scheduler.deschedule(&delayedNotify);
165}
166
167bool
168Event::triggered() const
169{
170    return false;
171}
172
173Events topLevelEvents;
174Events allEvents;
175
176EventsIt
177findEvent(const std::string &name)
178{
179    EventsIt it;
180    for (it = allEvents.begin(); it != allEvents.end(); it++)
181        if (!strcmp((*it)->name(), name.c_str()))
182            break;
183
184    return it;
185}
186
187} // namespace sc_gem5
188