1/* 2 * Copyright (c) 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26package jdk.nashorn.internal.ir; 27 28import java.io.Serializable; 29import java.util.List; 30import jdk.nashorn.internal.codegen.CompileUnit; 31 32/** 33 * An interface for splittable expressions. 34 */ 35public interface Splittable { 36 37 /** 38 * Get a list of split ranges for this splittable expression, or null 39 * if the expression should not be split. 40 * 41 * @return a list of split ranges 42 */ 43 List<SplitRange> getSplitRanges(); 44 45 /** 46 * A SplitRange is a range in a splittable expression. It defines the 47 * boundaries of the split range and provides a compile unit for code generation. 48 */ 49 final class SplitRange implements CompileUnitHolder, Serializable { 50 private static final long serialVersionUID = 1L; 51 52 /** Compile unit associated with the postsets range. */ 53 private final CompileUnit compileUnit; 54 55 /** postsets range associated with the unit (hi not inclusive). */ 56 private final int low, high; 57 58 /** 59 * Constructor 60 * @param compileUnit compile unit 61 * @param low lowest array index in unit 62 * @param high highest array index in unit + 1 63 */ 64 public SplitRange(final CompileUnit compileUnit, final int low, final int high) { 65 this.compileUnit = compileUnit; 66 this.low = low; 67 this.high = high; 68 } 69 70 /** 71 * Get the high index position of the ArrayUnit (exclusive) 72 * @return high index position 73 */ 74 public int getHigh() { 75 return high; 76 } 77 78 /** 79 * Get the low index position of the ArrayUnit (inclusive) 80 * @return low index position 81 */ 82 public int getLow() { 83 return low; 84 } 85 86 /** 87 * The array compile unit 88 * @return array compile unit 89 */ 90 @Override 91 public CompileUnit getCompileUnit() { 92 return compileUnit; 93 } 94 } 95} 96