001    /*
002     *  This file is part of the Jikes RVM project (http://jikesrvm.org).
003     *
004     *  This file is licensed to You under the Eclipse Public License (EPL);
005     *  You may not use this file except in compliance with the License. You
006     *  may obtain a copy of the License at
007     *
008     *      http://www.opensource.org/licenses/eclipse-1.0.php
009     *
010     *  See the COPYRIGHT.txt file distributed with this work for information
011     *  regarding copyright ownership.
012     */
013    package org.jikesrvm.adaptive;
014    
015    import org.jikesrvm.compilers.common.CompiledMethod;
016    import org.jikesrvm.compilers.common.CompiledMethods;
017    import org.jikesrvm.runtime.Magic;
018    import org.jikesrvm.scheduler.RVMThread;
019    import org.vmmagic.pragma.Unpreemptible;
020    import org.vmmagic.unboxed.Address;
021    import org.vmmagic.unboxed.Offset;
022    
023    /**
024     * Code invoked from Thread.yieldpoint for the purposes of OSR.
025     */
026    @Unpreemptible
027    public class OSRListener {
028    
029      public static boolean checkForOSRPromotion(int whereFrom, Address yieldpointServiceMethodFP) {
030        if (RVMThread.getCurrentThread().isSystemThread()) return false;
031    
032        if (whereFrom != RVMThread.BACKEDGE) return false;
033    
034        // See if we are at a loop backedge in an outdated baseline compiled method
035    
036        Address fp = yieldpointServiceMethodFP;
037        fp = Magic.getCallerFramePointer(fp);
038        int ypTakenInCMID = Magic.getCompiledMethodID(fp);
039        CompiledMethod ypTakenInCM = CompiledMethods.getCompiledMethod(ypTakenInCMID);
040        if (ypTakenInCM.isOutdated() && ypTakenInCM.getCompilerType() == CompiledMethod.BASELINE) {
041          Address tsFromFP = yieldpointServiceMethodFP;
042          Address realFP = Magic.getCallerFramePointer(tsFromFP);
043    
044          Address stackbeg = Magic.objectAsAddress(RVMThread.getCurrentThread().getStack());
045    
046          Offset tsFromFPoff = tsFromFP.diff(stackbeg);
047          Offset realFPoff = realFP.diff(stackbeg);
048    
049          OnStackReplacementTrigger.trigger(ypTakenInCMID, tsFromFPoff, realFPoff, whereFrom);
050          return true;
051        }
052        return false;
053      }
054    
055      public static void handleOSRFromOpt(Address yieldpointServiceMethodFP) {
056        Address tsFromFP = yieldpointServiceMethodFP;
057        Address realFP = Magic.getCallerFramePointer(tsFromFP);
058        int ypTakenInCMID = Magic.getCompiledMethodID(realFP);
059        Address stackbeg = Magic.objectAsAddress(RVMThread.getCurrentThread().getStack());
060    
061        Offset tsFromFPoff = tsFromFP.diff(stackbeg);
062        Offset realFPoff = realFP.diff(stackbeg);
063    
064        OnStackReplacementTrigger.trigger(ypTakenInCMID, tsFromFPoff, realFPoff, RVMThread.OSROPT);
065      }
066    }