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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;
/**
* Statement is something that becomes code and can be stepped past. A block is
* made up of statements. The only node subclass that needs to keep token and
* location information is the Statement
*/
public abstract class Statement extends Node implements Terminal {
private static final long serialVersionUID = 1L;
private final int lineNumber;
/**
* Constructor
*
* @param lineNumber line number
* @param token token
* @param finish finish
*/
public Statement(final int lineNumber, final long token, final int finish) {
super(token, finish);
this.lineNumber = lineNumber;
}
/**
* Constructor
*
* @param lineNumber line number
* @param token token
* @param start start
* @param finish finish
*/
protected Statement(final int lineNumber, final long token, final int start, final int finish) {
super(token, start, finish);
this.lineNumber = lineNumber;
}
/**
* Copy constructor
*
* @param node source node
*/
protected Statement(final Statement node) {
super(node);
this.lineNumber = node.lineNumber;
}
/**
* Return the line number
* @return line number
*/
public int getLineNumber() {
return lineNumber;
}
/**
* Is this a terminal statement, i.e. does it end control flow like a throw or return?
*
* @return true if this node statement is terminal
*/
@Override
public boolean isTerminal() {
return false;
}
/**
* Check if this statement repositions control flow with goto like
* semantics, for example {@link BreakNode} or a {@link ForNode} with no test
* @return true if statement has goto semantics
*/
public boolean hasGoto() {
return false;
}
/**
* Check if this statement has terminal flags, i.e. ends or breaks control flow
*
* @return true if has terminal flags
*/
public final boolean hasTerminalFlags() {
return isTerminal() || hasGoto();
}
}
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