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<pre><span class="sourceLineNo">001</span>package serp.bytecode;<a name="line.1"></a>
<span class="sourceLineNo">002</span><a name="line.2"></a>
<span class="sourceLineNo">003</span>import java.io.*;<a name="line.3"></a>
<span class="sourceLineNo">004</span>import java.util.*;<a name="line.4"></a>
<span class="sourceLineNo">005</span><a name="line.5"></a>
<span class="sourceLineNo">006</span>import serp.bytecode.visitor.*;<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>/**<a name="line.8"></a>
<span class="sourceLineNo">009</span> * An instruction that specifies a position in the code block to jump to.<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Examples include <code>go2, jsr</code>, etc.<a name="line.10"></a>
<span class="sourceLineNo">011</span> *<a name="line.11"></a>
<span class="sourceLineNo">012</span> * @author Abe White<a name="line.12"></a>
<span class="sourceLineNo">013</span> */<a name="line.13"></a>
<span class="sourceLineNo">014</span>public class GotoInstruction extends JumpInstruction {<a name="line.14"></a>
<span class="sourceLineNo">015</span><a name="line.15"></a>
<span class="sourceLineNo">016</span> GotoInstruction(Code owner, int opcode) {<a name="line.16"></a>
<span class="sourceLineNo">017</span> super(owner, opcode);<a name="line.17"></a>
<span class="sourceLineNo">018</span> }<a name="line.18"></a>
<span class="sourceLineNo">019</span><a name="line.19"></a>
<span class="sourceLineNo">020</span> public int getStackChange() {<a name="line.20"></a>
<span class="sourceLineNo">021</span> if (getOpcode() == Constants.JSR)<a name="line.21"></a>
<span class="sourceLineNo">022</span> return 1;<a name="line.22"></a>
<span class="sourceLineNo">023</span> return 0;<a name="line.23"></a>
<span class="sourceLineNo">024</span> }<a name="line.24"></a>
<span class="sourceLineNo">025</span><a name="line.25"></a>
<span class="sourceLineNo">026</span> int getLength() {<a name="line.26"></a>
<span class="sourceLineNo">027</span> switch (getOpcode()) {<a name="line.27"></a>
<span class="sourceLineNo">028</span> case Constants.GOTOW:<a name="line.28"></a>
<span class="sourceLineNo">029</span> case Constants.JSRW:<a name="line.29"></a>
<span class="sourceLineNo">030</span> return super.getLength() + 4;<a name="line.30"></a>
<span class="sourceLineNo">031</span> default:<a name="line.31"></a>
<span class="sourceLineNo">032</span> return super.getLength() + 2;<a name="line.32"></a>
<span class="sourceLineNo">033</span> }<a name="line.33"></a>
<span class="sourceLineNo">034</span> }<a name="line.34"></a>
<span class="sourceLineNo">035</span><a name="line.35"></a>
<span class="sourceLineNo">036</span> public void setOffset(int offset) {<a name="line.36"></a>
<span class="sourceLineNo">037</span> super.setOffset(offset);<a name="line.37"></a>
<span class="sourceLineNo">038</span> calculateOpcode();<a name="line.38"></a>
<span class="sourceLineNo">039</span> }<a name="line.39"></a>
<span class="sourceLineNo">040</span><a name="line.40"></a>
<span class="sourceLineNo">041</span> /**<a name="line.41"></a>
<span class="sourceLineNo">042</span> * Calculate our opcode based on the offset size.<a name="line.42"></a>
<span class="sourceLineNo">043</span> */<a name="line.43"></a>
<span class="sourceLineNo">044</span> private void calculateOpcode() {<a name="line.44"></a>
<span class="sourceLineNo">045</span> int len = getLength();<a name="line.45"></a>
<span class="sourceLineNo">046</span> int offset;<a name="line.46"></a>
<span class="sourceLineNo">047</span> switch (getOpcode()) {<a name="line.47"></a>
<span class="sourceLineNo">048</span> case Constants.GOTO:<a name="line.48"></a>
<span class="sourceLineNo">049</span> case Constants.GOTOW:<a name="line.49"></a>
<span class="sourceLineNo">050</span> offset = getOffset();<a name="line.50"></a>
<span class="sourceLineNo">051</span> if (offset < (2 << 16))<a name="line.51"></a>
<span class="sourceLineNo">052</span> setOpcode(Constants.GOTO);<a name="line.52"></a>
<span class="sourceLineNo">053</span> else<a name="line.53"></a>
<span class="sourceLineNo">054</span> setOpcode(Constants.GOTOW);<a name="line.54"></a>
<span class="sourceLineNo">055</span> break;<a name="line.55"></a>
<span class="sourceLineNo">056</span> case Constants.JSR:<a name="line.56"></a>
<span class="sourceLineNo">057</span> case Constants.JSRW:<a name="line.57"></a>
<span class="sourceLineNo">058</span> offset = getOffset();<a name="line.58"></a>
<span class="sourceLineNo">059</span> if (offset < (2 << 16))<a name="line.59"></a>
<span class="sourceLineNo">060</span> setOpcode(Constants.JSR);<a name="line.60"></a>
<span class="sourceLineNo">061</span> else<a name="line.61"></a>
<span class="sourceLineNo">062</span> setOpcode(Constants.JSRW);<a name="line.62"></a>
<span class="sourceLineNo">063</span> break;<a name="line.63"></a>
<span class="sourceLineNo">064</span> }<a name="line.64"></a>
<span class="sourceLineNo">065</span> if (len != getLength())<a name="line.65"></a>
<span class="sourceLineNo">066</span> invalidateByteIndexes();<a name="line.66"></a>
<span class="sourceLineNo">067</span> }<a name="line.67"></a>
<span class="sourceLineNo">068</span>}<a name="line.68"></a>
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