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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.
*
* 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 {
/** Exception expression. */
private final Expression expression;
private final int flags;
/** Is this block a synthethic rethrow created by finally inlining? */
public static final int IS_SYNTHETIC_RETHROW = 1;
/**
* Constructor
*
* @param lineNumber line number
* @param token token
* @param finish finish
* @param expression expression to throw
* @param flags flags
*/
public ThrowNode(final int lineNumber, final long token, final int finish, final Expression expression, final int flags) {
super(lineNumber, token, finish);
this.expression = expression;
this.flags = flags;
}
private ThrowNode(final ThrowNode node, final Expression expression, final int flags) {
super(node);
this.expression = expression;
this.flags = flags;
}
@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) {
sb.append("throw ");
if (expression != null) {
expression.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, flags);
}
/**
* 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 (flags & IS_SYNTHETIC_RETHROW) == IS_SYNTHETIC_RETHROW;
}
}
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