1 /* 2 * Copyright (c) 2010, 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 26 package jdk.nashorn.internal.runtime; 27 28 import static jdk.nashorn.internal.codegen.CompilerConstants.virtualCallNoLookup; 29 30 import java.util.concurrent.atomic.LongAdder; 31 import jdk.nashorn.internal.codegen.CompilerConstants; 32 33 /** 34 * A {@link ScriptObject} subclass for objects that act as scope. 35 */ 36 public class Scope extends ScriptObject { 37 38 /* This is used to store return state of split functions. */ 39 private int splitState = -1; 40 41 /** This is updated only in debug mode - counts number of {@code ScriptObject} instances created that are scope */ 42 private static final LongAdder count = Context.DEBUG ? new LongAdder() : null; 43 44 /** Method handle that points to {@link Scope#getSplitState}. */ 45 public static final CompilerConstants.Call GET_SPLIT_STATE = virtualCallNoLookup(Scope.class, "getSplitState", int.class); 46 /** Method handle that points to {@link Scope#setSplitState(int)}. */ 47 public static final CompilerConstants.Call SET_SPLIT_STATE = virtualCallNoLookup(Scope.class, "setSplitState", void.class, int.class); 48 49 /** 50 * Constructor 51 * 52 * @param map initial property map 53 */ 54 public Scope(final PropertyMap map) { 55 super(map); 56 incrementCount(); 57 } 58 59 /** 60 * Constructor 61 * 62 * @param proto parent scope 63 * @param map initial property map 64 */ 65 public Scope(final ScriptObject proto, final PropertyMap map) { 66 super(proto, map); 67 incrementCount(); 68 } 69 70 /** 71 * Constructor 72 * 73 * @param map property map 74 * @param primitiveSpill primitive spill array 75 * @param objectSpill reference spill array 76 */ 77 public Scope(final PropertyMap map, final long[] primitiveSpill, final Object[] objectSpill) { 78 super(map, primitiveSpill, objectSpill); 79 incrementCount(); 80 } 81 82 @Override 83 public boolean isScope() { 84 return true; 85 } 86 87 @Override 88 boolean hasWithScope() { 89 for (ScriptObject obj = this; obj != null; obj = obj.getProto()) { 90 if (obj instanceof WithObject) { 91 return true; 92 } 93 } 94 return false; 95 } 96 97 /** 98 * Get the scope's split method state. 99 * 100 * @return current split state 101 */ 102 public int getSplitState() { 103 return splitState; 104 } 105 106 /** 107 * Set the scope's split method state. 108 * 109 * @param state current split state 110 */ 111 public void setSplitState(final int state) { 112 splitState = state; 113 } 114 115 /** 116 * Get number of {@code Scope} instances created. If not running in debug 117 * mode this is always 0. 118 * 119 * @return number of scope ScriptObjects created 120 */ 121 public static long getScopeCount() { 122 return count != null ? count.sum() : 0; 123 } 124 125 private static void incrementCount() { 126 if (Context.DEBUG) { 127 count.increment(); 128 } 129 } 130 }