1 /*
   2  * Copyright (c) 2009, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 package org.graalvm.compiler.java;
  24 
  25 import java.util.BitSet;
  26 
  27 import org.graalvm.compiler.java.BciBlockMapping.BciBlock;
  28 
  29 public final class LargeLocalLiveness extends LocalLiveness {
  30     private BitSet[] localsLiveIn;
  31     private BitSet[] localsLiveOut;
  32     private BitSet[] localsLiveGen;
  33     private BitSet[] localsLiveKill;
  34     private BitSet[] localsChangedInLoop;
  35 
  36     public LargeLocalLiveness(BciBlock[] blocks, int maxLocals, int loopCount) {
  37         super(blocks);
  38         int blocksSize = blocks.length;
  39         localsLiveIn = new BitSet[blocksSize];
  40         localsLiveOut = new BitSet[blocksSize];
  41         localsLiveGen = new BitSet[blocksSize];
  42         localsLiveKill = new BitSet[blocksSize];
  43         for (int i = 0; i < blocksSize; i++) {
  44             localsLiveIn[i] = new BitSet(maxLocals);
  45             localsLiveOut[i] = new BitSet(maxLocals);
  46             localsLiveGen[i] = new BitSet(maxLocals);
  47             localsLiveKill[i] = new BitSet(maxLocals);
  48         }
  49         localsChangedInLoop = new BitSet[loopCount];
  50         for (int i = 0; i < loopCount; ++i) {
  51             localsChangedInLoop[i] = new BitSet(maxLocals);
  52         }
  53     }
  54 
  55     @Override
  56     protected String debugLiveIn(int blockID) {
  57         return localsLiveIn[blockID].toString();
  58     }
  59 
  60     @Override
  61     protected String debugLiveOut(int blockID) {
  62         return localsLiveOut[blockID].toString();
  63     }
  64 
  65     @Override
  66     protected String debugLiveGen(int blockID) {
  67         return localsLiveGen[blockID].toString();
  68     }
  69 
  70     @Override
  71     protected String debugLiveKill(int blockID) {
  72         return localsLiveKill[blockID].toString();
  73     }
  74 
  75     @Override
  76     protected int liveOutCardinality(int blockID) {
  77         return localsLiveOut[blockID].cardinality();
  78     }
  79 
  80     @Override
  81     protected void propagateLiveness(int blockID, int successorID) {
  82         localsLiveOut[blockID].or(localsLiveIn[successorID]);
  83     }
  84 
  85     @Override
  86     protected void updateLiveness(int blockID) {
  87         BitSet liveIn = localsLiveIn[blockID];
  88         liveIn.clear();
  89         liveIn.or(localsLiveOut[blockID]);
  90         liveIn.andNot(localsLiveKill[blockID]);
  91         liveIn.or(localsLiveGen[blockID]);
  92     }
  93 
  94     @Override
  95     protected void loadOne(int blockID, int local) {
  96         if (!localsLiveKill[blockID].get(local)) {
  97             localsLiveGen[blockID].set(local);
  98         }
  99     }
 100 
 101     @Override
 102     protected void storeOne(int blockID, int local) {
 103         if (!localsLiveGen[blockID].get(local)) {
 104             localsLiveKill[blockID].set(local);
 105         }
 106 
 107         BciBlock block = blocks[blockID];
 108         long tmp = block.loops;
 109         int pos = 0;
 110         while (tmp != 0) {
 111             if ((tmp & 1L) == 1L) {
 112                 this.localsChangedInLoop[pos].set(local);
 113             }
 114             tmp >>>= 1;
 115             ++pos;
 116         }
 117     }
 118 
 119     @Override
 120     public boolean localIsLiveIn(BciBlock block, int local) {
 121         return block.getId() >= Integer.MAX_VALUE ? true : localsLiveIn[block.getId()].get(local);
 122     }
 123 
 124     @Override
 125     public boolean localIsLiveOut(BciBlock block, int local) {
 126         return block.getId() >= Integer.MAX_VALUE ? true : localsLiveOut[block.getId()].get(local);
 127     }
 128 
 129     @Override
 130     public boolean localIsChangedInLoop(int loopId, int local) {
 131         return localsChangedInLoop[loopId].get(local);
 132     }
 133 }