1 /* 2 * Copyright (c) 2014, 2016, 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.nodes.cfg; 24 25 import org.graalvm.compiler.core.common.LocationIdentity; 26 import org.graalvm.compiler.core.common.cfg.Loop; 27 import org.graalvm.compiler.nodes.LoopBeginNode; 28 29 public final class HIRLoop extends Loop<Block> { 30 31 private LocationSet killLocations; 32 33 protected HIRLoop(Loop<Block> parent, int index, Block header) { 34 super(parent, index, header); 35 } 36 37 @Override 38 public long numBackedges() { 39 return ((LoopBeginNode) getHeader().getBeginNode()).loopEnds().count(); 40 } 41 42 public LocationSet getKillLocations() { 43 if (killLocations == null) { 44 killLocations = new LocationSet(); 45 for (Block b : this.getBlocks()) { 46 if (b.getLoop() == this) { 47 killLocations.addAll(b.getKillLocations()); 48 if (killLocations.isAny()) { 49 break; 50 } 51 } 52 } 53 } 54 for (Loop<Block> child : this.getChildren()) { 55 if (killLocations.isAny()) { 56 break; 57 } 58 killLocations.addAll(((HIRLoop) child).getKillLocations()); 59 } 60 return killLocations; 61 } 62 63 public boolean canKill(LocationIdentity location) { 64 return getKillLocations().contains(location); 65 } 66 67 @Override 68 public String toString() { 69 return super.toString() + " header:" + getHeader().getBeginNode(); 70 } 71 }