| /* |
| * Copyright (c) 2010, 2013, 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * 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 jdk.nashorn.internal.ir; |
| |
| import jdk.nashorn.internal.ir.annotations.Immutable; |
| import jdk.nashorn.internal.ir.visitor.NodeVisitor; |
| |
| /** |
| * IR representation for THROW statements. |
| */ |
| @Immutable |
| public final class ThrowNode extends Statement implements JoinPredecessor { |
| private static final long serialVersionUID = 1L; |
| |
| /** Exception expression. */ |
| private final Expression expression; |
| |
| private final LocalVariableConversion conversion; |
| |
| private final boolean isSyntheticRethrow; |
| |
| /** |
| * Constructor |
| * |
| * @param lineNumber line number |
| * @param token token |
| * @param finish finish |
| * @param expression expression to throw |
| * @param isSyntheticRethrow true if this throw node is part of a synthetic rethrow. |
| */ |
| public ThrowNode(final int lineNumber, final long token, final int finish, final Expression expression, final boolean isSyntheticRethrow) { |
| super(lineNumber, token, finish); |
| this.expression = expression; |
| this.isSyntheticRethrow = isSyntheticRethrow; |
| this.conversion = null; |
| } |
| |
| private ThrowNode(final ThrowNode node, final Expression expression, final boolean isSyntheticRethrow, |
| final LocalVariableConversion conversion) { |
| super(node); |
| this.expression = expression; |
| this.isSyntheticRethrow = isSyntheticRethrow; |
| this.conversion = conversion; |
| } |
| |
| @Override |
| public boolean isTerminal() { |
| return true; |
| } |
| |
| /** |
| * Assist in IR navigation. |
| * @param visitor IR navigating visitor. |
| */ |
| @Override |
| public Node accept(final NodeVisitor<? extends LexicalContext> visitor) { |
| if (visitor.enterThrowNode(this)) { |
| return visitor.leaveThrowNode(setExpression((Expression)expression.accept(visitor))); |
| } |
| |
| return this; |
| } |
| |
| @Override |
| public void toString(final StringBuilder sb, final boolean printType) { |
| sb.append("throw "); |
| |
| if (expression != null) { |
| expression.toString(sb, printType); |
| } |
| if (conversion != null) { |
| conversion.toString(sb); |
| } |
| } |
| |
| /** |
| * Get the expression that is being thrown by this node |
| * @return expression |
| */ |
| public Expression getExpression() { |
| return expression; |
| } |
| |
| /** |
| * Reset the expression being thrown by this node |
| * @param expression new expression |
| * @return new or same thrownode |
| */ |
| public ThrowNode setExpression(final Expression expression) { |
| if (this.expression == expression) { |
| return this; |
| } |
| return new ThrowNode(this, expression, isSyntheticRethrow, conversion); |
| } |
| |
| /** |
| * Is this a throw a synthetic rethrow in a synthetic catch-all block |
| * created when inlining finally statements? In that case we never |
| * wrap whatever is thrown into an ECMAException, just rethrow it. |
| * @return true if synthetic throw node |
| */ |
| public boolean isSyntheticRethrow() { |
| return isSyntheticRethrow; |
| } |
| |
| @Override |
| public JoinPredecessor setLocalVariableConversion(final LexicalContext lc, final LocalVariableConversion conversion) { |
| if(this.conversion == conversion) { |
| return this; |
| } |
| return new ThrowNode(this, expression, isSyntheticRethrow, conversion); |
| } |
| |
| @Override |
| public LocalVariableConversion getLocalVariableConversion() { |
| return conversion; |
| } |
| |
| } |