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| <FONT color="green">001</FONT> /*<a name="line.1"></a> |
| <FONT color="green">002</FONT> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a> |
| <FONT color="green">003</FONT> * or more contributor license agreements. See the NOTICE file<a name="line.3"></a> |
| <FONT color="green">004</FONT> * distributed with this work for additional information<a name="line.4"></a> |
| <FONT color="green">005</FONT> * regarding copyright ownership. The ASF licenses this file<a name="line.5"></a> |
| <FONT color="green">006</FONT> * to you under the Apache License, Version 2.0 (the "License");<a name="line.6"></a> |
| <FONT color="green">007</FONT> * you may not use this file except in compliance with the License.<a name="line.7"></a> |
| <FONT color="green">008</FONT> * You may obtain a copy of the License at<a name="line.8"></a> |
| <FONT color="green">009</FONT> *<a name="line.9"></a> |
| <FONT color="green">010</FONT> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a> |
| <FONT color="green">011</FONT> *<a name="line.11"></a> |
| <FONT color="green">012</FONT> * Unless required by applicable law or agreed to in writing, software<a name="line.12"></a> |
| <FONT color="green">013</FONT> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a> |
| <FONT color="green">014</FONT> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a> |
| <FONT color="green">015</FONT> * See the License for the specific language governing permissions and<a name="line.15"></a> |
| <FONT color="green">016</FONT> * limitations under the License.<a name="line.16"></a> |
| <FONT color="green">017</FONT> */<a name="line.17"></a> |
| <FONT color="green">018</FONT> /*<a name="line.18"></a> |
| <FONT color="green">019</FONT> * $Id: MarkerInstruction.java 1225426 2011-12-29 04:13:08Z mrglavas $<a name="line.19"></a> |
| <FONT color="green">020</FONT> */<a name="line.20"></a> |
| <FONT color="green">021</FONT> <a name="line.21"></a> |
| <FONT color="green">022</FONT> package org.apache.xalan.xsltc.compiler.util;<a name="line.22"></a> |
| <FONT color="green">023</FONT> <a name="line.23"></a> |
| <FONT color="green">024</FONT> import java.io.DataOutputStream;<a name="line.24"></a> |
| <FONT color="green">025</FONT> import java.io.IOException;<a name="line.25"></a> |
| <FONT color="green">026</FONT> <a name="line.26"></a> |
| <FONT color="green">027</FONT> import org.apache.bcel.Constants;<a name="line.27"></a> |
| <FONT color="green">028</FONT> import org.apache.bcel.generic.ConstantPoolGen;<a name="line.28"></a> |
| <FONT color="green">029</FONT> import org.apache.bcel.generic.Instruction;<a name="line.29"></a> |
| <FONT color="green">030</FONT> import org.apache.bcel.generic.Visitor;<a name="line.30"></a> |
| <FONT color="green">031</FONT> <a name="line.31"></a> |
| <FONT color="green">032</FONT> /**<a name="line.32"></a> |
| <FONT color="green">033</FONT> * A special abstract dummy subclass of<a name="line.33"></a> |
| <FONT color="green">034</FONT> * {@link org.apache.bcel.generic.Instruction} used to mark locations of<a name="line.34"></a> |
| <FONT color="green">035</FONT> * interest in an {@link org.apache.bcel.generic.InstructionList}. It and<a name="line.35"></a> |
| <FONT color="green">036</FONT> * its subclasses are only used as placeholders, and do not contribute to the<a name="line.36"></a> |
| <FONT color="green">037</FONT> * actual byte code instruction stream.<a name="line.37"></a> |
| <FONT color="green">038</FONT> */<a name="line.38"></a> |
| <FONT color="green">039</FONT> abstract class MarkerInstruction extends Instruction {<a name="line.39"></a> |
| <FONT color="green">040</FONT> /**<a name="line.40"></a> |
| <FONT color="green">041</FONT> * Zero-argument constructor. Sets the opcode to an invalid value and <a name="line.41"></a> |
| <FONT color="green">042</FONT> * sets the length to zero, as it will not be written as part of the<a name="line.42"></a> |
| <FONT color="green">043</FONT> * generated byte code.<a name="line.43"></a> |
| <FONT color="green">044</FONT> */<a name="line.44"></a> |
| <FONT color="green">045</FONT> public MarkerInstruction() {<a name="line.45"></a> |
| <FONT color="green">046</FONT> super(Constants.UNDEFINED, (short) 0);<a name="line.46"></a> |
| <FONT color="green">047</FONT> }<a name="line.47"></a> |
| <FONT color="green">048</FONT> <a name="line.48"></a> |
| <FONT color="green">049</FONT> /**<a name="line.49"></a> |
| <FONT color="green">050</FONT> * {@link org.apache.bcel.generic.Visitor}s will know nothing about this<a name="line.50"></a> |
| <FONT color="green">051</FONT> * kind of {@link org.apche.bcel.generic.Instruction}, so this method does<a name="line.51"></a> |
| <FONT color="green">052</FONT> * nothing.<a name="line.52"></a> |
| <FONT color="green">053</FONT> */<a name="line.53"></a> |
| <FONT color="green">054</FONT> public void accept(Visitor v) {<a name="line.54"></a> |
| <FONT color="green">055</FONT> }<a name="line.55"></a> |
| <FONT color="green">056</FONT> <a name="line.56"></a> |
| <FONT color="green">057</FONT> /**<a name="line.57"></a> |
| <FONT color="green">058</FONT> * The number of JVM stack entries consumed by the instruction.<a name="line.58"></a> |
| <FONT color="green">059</FONT> * This instruction is just a place holder, so it does not consume any<a name="line.59"></a> |
| <FONT color="green">060</FONT> * stack entries.<a name="line.60"></a> |
| <FONT color="green">061</FONT> * @param cpg The {@link org.apache.bcel.generic.ConstantPoolGen} for the<a name="line.61"></a> |
| <FONT color="green">062</FONT> * current {@link org.apache.bcel.generic.ClassGen}<a name="line.62"></a> |
| <FONT color="green">063</FONT> * @return <code>0</code> always <a name="line.63"></a> |
| <FONT color="green">064</FONT> */<a name="line.64"></a> |
| <FONT color="green">065</FONT> final public int consumeStack(ConstantPoolGen cpg) {<a name="line.65"></a> |
| <FONT color="green">066</FONT> return 0;<a name="line.66"></a> |
| <FONT color="green">067</FONT> }<a name="line.67"></a> |
| <FONT color="green">068</FONT> /**<a name="line.68"></a> |
| <FONT color="green">069</FONT> * The number of JVM stack entries produced by the instruction.<a name="line.69"></a> |
| <FONT color="green">070</FONT> * This instruction is just a place holder, so it does not produce any<a name="line.70"></a> |
| <FONT color="green">071</FONT> * stack entries.<a name="line.71"></a> |
| <FONT color="green">072</FONT> * @param cpg The {@link org.apache.bcel.generic.ConstantPoolGen} for the<a name="line.72"></a> |
| <FONT color="green">073</FONT> * current {@link org.apache.bcel.generic.ClassGen}<a name="line.73"></a> |
| <FONT color="green">074</FONT> * @return <code>0</code> always <a name="line.74"></a> |
| <FONT color="green">075</FONT> */<a name="line.75"></a> |
| <FONT color="green">076</FONT> final public int produceStack(ConstantPoolGen cpg) {<a name="line.76"></a> |
| <FONT color="green">077</FONT> return 0;<a name="line.77"></a> |
| <FONT color="green">078</FONT> }<a name="line.78"></a> |
| <FONT color="green">079</FONT> <a name="line.79"></a> |
| <FONT color="green">080</FONT> /**<a name="line.80"></a> |
| <FONT color="green">081</FONT> * Produce a copy of the instruction. By default a<a name="line.81"></a> |
| <FONT color="green">082</FONT> * {@link MarkerInstruction} has no parameters, so the base implementation<a name="line.82"></a> |
| <FONT color="green">083</FONT> * of {@link #copy()} returns the instruction itself.<a name="line.83"></a> |
| <FONT color="green">084</FONT> * @return The instruction itself.<a name="line.84"></a> |
| <FONT color="green">085</FONT> */<a name="line.85"></a> |
| <FONT color="green">086</FONT> public Instruction copy() {<a name="line.86"></a> |
| <FONT color="green">087</FONT> return this;<a name="line.87"></a> |
| <FONT color="green">088</FONT> }<a name="line.88"></a> |
| <FONT color="green">089</FONT> /**<a name="line.89"></a> |
| <FONT color="green">090</FONT> * Dump instruction as byte code to stream out. A {@link MarkerInstruction}<a name="line.90"></a> |
| <FONT color="green">091</FONT> * has no effect on the generated byte code so it is never emitted to the<a name="line.91"></a> |
| <FONT color="green">092</FONT> * output stream.<a name="line.92"></a> |
| <FONT color="green">093</FONT> * @param out Output stream<a name="line.93"></a> |
| <FONT color="green">094</FONT> */<a name="line.94"></a> |
| <FONT color="green">095</FONT> final public void dump(DataOutputStream out) throws IOException {<a name="line.95"></a> |
| <FONT color="green">096</FONT> }<a name="line.96"></a> |
| <FONT color="green">097</FONT> }<a name="line.97"></a> |
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| </PRE> |
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