event.cc revision 12988
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 41namespace sc_gem5 42{ 43 44Event::Event(sc_core::sc_event *_sc_event) : Event(_sc_event, "") {} 45 46Event::Event(sc_core::sc_event *_sc_event, const char *_basename) : 47 _sc_event(_sc_event), _basename(_basename), delayedNotifyEvent(this) 48{ 49 Module *p = currentModule(); 50 51 if (p) 52 parent = p->obj()->sc_obj(); 53 else if (scheduler.current()) 54 parent = scheduler.current(); 55 else 56 parent = nullptr; 57 58 if (parent) { 59 Object *obj = Object::getFromScObject(parent); 60 obj->addChildEvent(_sc_event); 61 } else { 62 topLevelEvents.emplace(topLevelEvents.end(), _sc_event); 63 } 64 65 if (parent) 66 _name = std::string(parent->name()) + "." + _basename; 67 else 68 _name = _basename; 69 70 allEvents.emplace(allEvents.end(), _sc_event); 71 72 // Determine if we're in the hierarchy (created once initialization starts 73 // means no). 74} 75 76Event::~Event() 77{ 78 if (parent) { 79 Object *obj = Object::getFromScObject(parent); 80 obj->delChildEvent(_sc_event); 81 } else { 82 EventsIt it = find(topLevelEvents.begin(), topLevelEvents.end(), 83 _sc_event); 84 assert(it != topLevelEvents.end()); 85 std::swap(*it, topLevelEvents.back()); 86 topLevelEvents.pop_back(); 87 } 88 89 EventsIt it = findEvent(_name); 90 std::swap(*it, allEvents.back()); 91 allEvents.pop_back(); 92 93 if (delayedNotifyEvent.scheduled()) 94 scheduler.deschedule(&delayedNotifyEvent); 95} 96 97const std::string & 98Event::name() const 99{ 100 return _name; 101} 102 103const std::string & 104Event::basename() const 105{ 106 return _basename; 107} 108 109bool 110Event::inHierarchy() const 111{ 112 return _name.length() != 0; 113} 114 115sc_core::sc_object * 116Event::getParentObject() const 117{ 118 return parent; 119} 120 121void 122Event::notify() 123{ 124 auto local_sensitivities = sensitivities; 125 for (auto s: local_sensitivities) 126 s->notify(this); 127} 128 129void 130Event::delayedNotify() 131{ 132 scheduler.eventHappened(); 133 notify(); 134} 135 136void 137Event::notify(const sc_core::sc_time &t) 138{ 139 //XXX We're assuming the systemc time resolution is in ps. 140 Tick new_tick = t.value() * SimClock::Int::ps + scheduler.getCurTick(); 141 if (delayedNotifyEvent.scheduled()) { 142 Tick old_tick = delayedNotifyEvent.when(); 143 144 if (new_tick >= old_tick) 145 return; 146 147 scheduler.deschedule(&delayedNotifyEvent); 148 } 149 150 scheduler.schedule(&delayedNotifyEvent, new_tick); 151} 152 153void 154Event::cancel() 155{ 156 if (delayedNotifyEvent.scheduled()) 157 scheduler.deschedule(&delayedNotifyEvent); 158} 159 160bool 161Event::triggered() const 162{ 163 return false; 164} 165 166Events topLevelEvents; 167Events allEvents; 168 169EventsIt 170findEvent(const std::string &name) 171{ 172 EventsIt it; 173 for (it = allEvents.begin(); it != allEvents.end(); it++) 174 if (!strcmp((*it)->name(), name.c_str())) 175 break; 176 177 return it; 178} 179 180} // namespace sc_gem5 181