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* 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.
*
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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
*/
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