| /* |
| * Copyright (c) 2009, 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package org.graalvm.compiler.java; |
| |
| import org.graalvm.compiler.java.BciBlockMapping.BciBlock; |
| |
| public final class SmallLocalLiveness extends LocalLiveness { |
| /* |
| * local n is represented by the bit accessible as (1 << n) |
| */ |
| |
| private final long[] localsLiveIn; |
| private final long[] localsLiveOut; |
| private final long[] localsLiveGen; |
| private final long[] localsLiveKill; |
| private final long[] localsChangedInLoop; |
| private final int maxLocals; |
| |
| public SmallLocalLiveness(BciBlock[] blocks, int maxLocals, int loopCount) { |
| super(blocks); |
| this.maxLocals = maxLocals; |
| int blockSize = blocks.length; |
| localsLiveIn = new long[blockSize]; |
| localsLiveOut = new long[blockSize]; |
| localsLiveGen = new long[blockSize]; |
| localsLiveKill = new long[blockSize]; |
| localsChangedInLoop = new long[loopCount]; |
| } |
| |
| private String debugString(long value) { |
| StringBuilder str = new StringBuilder("{"); |
| long current = value; |
| for (int i = 0; i < maxLocals; i++) { |
| if ((current & 1L) == 1L) { |
| if (str.length() > 1) { |
| str.append(", "); |
| } |
| str.append(i); |
| } |
| current >>= 1; |
| } |
| return str.append('}').toString(); |
| } |
| |
| @Override |
| protected String debugLiveIn(int blockID) { |
| return debugString(localsLiveIn[blockID]); |
| } |
| |
| @Override |
| protected String debugLiveOut(int blockID) { |
| return debugString(localsLiveOut[blockID]); |
| } |
| |
| @Override |
| protected String debugLiveGen(int blockID) { |
| return debugString(localsLiveGen[blockID]); |
| } |
| |
| @Override |
| protected String debugLiveKill(int blockID) { |
| return debugString(localsLiveKill[blockID]); |
| } |
| |
| @Override |
| protected int liveOutCardinality(int blockID) { |
| return Long.bitCount(localsLiveOut[blockID]); |
| } |
| |
| @Override |
| protected void propagateLiveness(int blockID, int successorID) { |
| localsLiveOut[blockID] |= localsLiveIn[successorID]; |
| } |
| |
| @Override |
| protected void updateLiveness(int blockID) { |
| localsLiveIn[blockID] = (localsLiveOut[blockID] & ~localsLiveKill[blockID]) | localsLiveGen[blockID]; |
| } |
| |
| @Override |
| protected void loadOne(int blockID, int local) { |
| long bit = 1L << local; |
| if ((localsLiveKill[blockID] & bit) == 0L) { |
| localsLiveGen[blockID] |= bit; |
| } |
| } |
| |
| @Override |
| protected void storeOne(int blockID, int local) { |
| long bit = 1L << local; |
| if ((localsLiveGen[blockID] & bit) == 0L) { |
| localsLiveKill[blockID] |= bit; |
| } |
| |
| BciBlock block = blocks[blockID]; |
| long tmp = block.loops; |
| int pos = 0; |
| while (tmp != 0) { |
| if ((tmp & 1L) == 1L) { |
| this.localsChangedInLoop[pos] |= bit; |
| } |
| tmp >>>= 1; |
| ++pos; |
| } |
| } |
| |
| @Override |
| public boolean localIsLiveIn(BciBlock block, int local) { |
| int blockID = block.getId(); |
| return blockID >= Integer.MAX_VALUE ? false : (localsLiveIn[blockID] & (1L << local)) != 0L; |
| } |
| |
| @Override |
| public boolean localIsLiveOut(BciBlock block, int local) { |
| int blockID = block.getId(); |
| return blockID >= Integer.MAX_VALUE ? false : (localsLiveOut[blockID] & (1L << local)) != 0L; |
| } |
| |
| @Override |
| public boolean localIsChangedInLoop(int loopId, int local) { |
| return (localsChangedInLoop[loopId] & (1L << local)) != 0L; |
| } |
| } |