simulate.cc revision 4123:9c80390ea1bb
1/* 2 * Copyright (c) 2006 The Regents of The University of Michigan 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; 9 * redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Authors: Nathan Binkert 29 * Steve Reinhardt 30 */ 31 32#include "base/misc.hh" 33#include "base/pollevent.hh" 34#include "sim/stat_control.hh" 35#include "sim/async.hh" 36#include "sim/eventq.hh" 37#include "sim/host.hh" 38#include "sim/sim_events.hh" 39#include "sim/sim_exit.hh" 40#include "sim/simulate.hh" 41 42/** Simulate for num_cycles additional cycles. If num_cycles is -1 43 * (the default), do not limit simulation; some other event must 44 * terminate the loop. Exported to Python via SWIG. 45 * @return The SimLoopExitEvent that caused the loop to exit. 46 */ 47SimLoopExitEvent * 48simulate(Tick num_cycles) 49{ 50 warn("Entering event queue @ %d. Starting simulation...\n", curTick); 51 52 if (num_cycles < 0) 53 fatal("simulate: num_cycles must be >= 0 (was %d)\n", num_cycles); 54 else if (curTick + num_cycles < 0) //Overflow 55 num_cycles = MaxTick; 56 else 57 num_cycles = curTick + num_cycles; 58 59 Event *limit_event; 60 limit_event = schedExitSimLoop("simulate() limit reached", num_cycles); 61 62 while (1) { 63 // there should always be at least one event (the SimLoopExitEvent 64 // we just scheduled) in the queue 65 assert(!mainEventQueue.empty()); 66 assert(curTick <= mainEventQueue.nextTick() && 67 "event scheduled in the past"); 68 69 // forward current cycle to the time of the first event on the 70 // queue 71 curTick = mainEventQueue.nextTick(); 72 Event *exit_event = mainEventQueue.serviceOne(); 73 if (exit_event != NULL) { 74 // hit some kind of exit event; return to Python 75 // event must be subclass of SimLoopExitEvent... 76 SimLoopExitEvent *se_event; 77 se_event = dynamic_cast<SimLoopExitEvent *>(exit_event); 78 79 if (se_event == NULL) 80 panic("Bogus exit event class!"); 81 82 // if we didn't hit limit_event, delete it 83 if (se_event != limit_event) { 84 assert(limit_event->scheduled()); 85 limit_event->deschedule(); 86 delete limit_event; 87 } 88 89 return se_event; 90 } 91 92 if (async_event) { 93 async_event = false; 94 if (async_statdump || async_statreset) { 95 async_statdump = false; 96 async_statreset = false; 97 98 Stats::StatEvent(async_statdump, async_statreset); 99 } 100 101 if (async_exit) { 102 async_exit = false; 103 exitSimLoop("user interrupt received"); 104 } 105 106 if (async_io || async_alarm) { 107 async_io = false; 108 async_alarm = false; 109 pollQueue.service(); 110 } 111 112 if (async_exception) { 113 async_exception = false; 114 return NULL; 115 } 116 } 117 } 118 119 // not reached... only exit is return on SimLoopExitEvent 120} 121 122