1 /* 2 * Copyright (c) 2010, 2013, 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.ir; 27 28 import jdk.nashorn.internal.ir.annotations.Immutable; 29 import jdk.nashorn.internal.ir.visitor.NodeVisitor; 30 31 /** 32 * IR representation for THROW statements. 33 */ 34 @Immutable 35 public final class ThrowNode extends Statement implements JoinPredecessor { 36 private static final long serialVersionUID = 1L; 37 38 /** Exception expression. */ 39 private final Expression expression; 40 41 private final LocalVariableConversion conversion; 42 43 private final boolean isSyntheticRethrow; 44 45 /** 46 * Constructor 47 * 48 * @param lineNumber line number 49 * @param token token 50 * @param finish finish 51 * @param expression expression to throw 52 * @param isSyntheticRethrow true if this throw node is part of a synthetic rethrow. 53 */ 54 public ThrowNode(final int lineNumber, final long token, final int finish, final Expression expression, final boolean isSyntheticRethrow) { 55 super(lineNumber, token, finish); 56 this.expression = expression; 57 this.isSyntheticRethrow = isSyntheticRethrow; 58 this.conversion = null; 59 } 60 61 private ThrowNode(final ThrowNode node, final Expression expression, final boolean isSyntheticRethrow, 62 final LocalVariableConversion conversion) { 63 super(node); 64 this.expression = expression; 65 this.isSyntheticRethrow = isSyntheticRethrow; 66 this.conversion = conversion; 67 } 68 69 @Override 70 public boolean isTerminal() { 71 return true; 72 } 73 74 /** 75 * Assist in IR navigation. 76 * @param visitor IR navigating visitor. 77 */ 78 @Override 79 public Node accept(final NodeVisitor<? extends LexicalContext> visitor) { 80 if (visitor.enterThrowNode(this)) { 81 return visitor.leaveThrowNode(setExpression((Expression)expression.accept(visitor))); 82 } 83 84 return this; 85 } 86 87 @Override 88 public void toString(final StringBuilder sb, final boolean printType) { 89 sb.append("throw "); 90 91 if (expression != null) { 92 expression.toString(sb, printType); 93 } 94 if (conversion != null) { 95 conversion.toString(sb); 96 } 97 } 98 99 /** 100 * Get the expression that is being thrown by this node 101 * @return expression 102 */ 103 public Expression getExpression() { 104 return expression; 105 } 106 107 /** 108 * Reset the expression being thrown by this node 109 * @param expression new expression 110 * @return new or same thrownode 111 */ 112 public ThrowNode setExpression(final Expression expression) { 113 if (this.expression == expression) { 114 return this; 115 } 116 return new ThrowNode(this, expression, isSyntheticRethrow, conversion); 117 } 118 119 /** 120 * Is this a throw a synthetic rethrow in a synthetic catch-all block 121 * created when inlining finally statements? In that case we never 122 * wrap whatever is thrown into an ECMAException, just rethrow it. 123 * @return true if synthetic throw node 124 */ 125 public boolean isSyntheticRethrow() { 126 return isSyntheticRethrow; 127 } 128 129 @Override 130 public JoinPredecessor setLocalVariableConversion(final LexicalContext lc, final LocalVariableConversion conversion) { 131 if(this.conversion == conversion) { 132 return this; 133 } 134 return new ThrowNode(this, expression, isSyntheticRethrow, conversion); 135 } 136 137 @Override 138 public LocalVariableConversion getLocalVariableConversion() { 139 return conversion; 140 } 141 142 }