| /* |
| * 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(); |
| } |
| } |
| |