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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 abstract class JumpInstruction extends Instruction <a name="line.14"></a>
<span class="sourceLineNo">015</span> implements InstructionPtr {<a name="line.15"></a>
<span class="sourceLineNo">016</span> private InstructionPtrStrategy _target = new InstructionPtrStrategy(this);<a name="line.16"></a>
<span class="sourceLineNo">017</span><a name="line.17"></a>
<span class="sourceLineNo">018</span> JumpInstruction(Code owner, int opcode) {<a name="line.18"></a>
<span class="sourceLineNo">019</span> super(owner, opcode);<a name="line.19"></a>
<span class="sourceLineNo">020</span> }<a name="line.20"></a>
<span class="sourceLineNo">021</span><a name="line.21"></a>
<span class="sourceLineNo">022</span> /**<a name="line.22"></a>
<span class="sourceLineNo">023</span> * Get the current target instruction to jump to, if it has been set.<a name="line.23"></a>
<span class="sourceLineNo">024</span> */<a name="line.24"></a>
<span class="sourceLineNo">025</span> public Instruction getTarget() {<a name="line.25"></a>
<span class="sourceLineNo">026</span> return _target.getTargetInstruction();<a name="line.26"></a>
<span class="sourceLineNo">027</span> }<a name="line.27"></a>
<span class="sourceLineNo">028</span><a name="line.28"></a>
<span class="sourceLineNo">029</span> /**<a name="line.29"></a>
<span class="sourceLineNo">030</span> * Set the instruction to jump to; the instruction must already be<a name="line.30"></a>
<span class="sourceLineNo">031</span> * added to the code block.<a name="line.31"></a>
<span class="sourceLineNo">032</span> *<a name="line.32"></a>
<span class="sourceLineNo">033</span> * @return this instruction, for method chaining<a name="line.33"></a>
<span class="sourceLineNo">034</span> */<a name="line.34"></a>
<span class="sourceLineNo">035</span> public JumpInstruction setTarget(Instruction instruction) {<a name="line.35"></a>
<span class="sourceLineNo">036</span> _target.setTargetInstruction(instruction);<a name="line.36"></a>
<span class="sourceLineNo">037</span> return this;<a name="line.37"></a>
<span class="sourceLineNo">038</span> }<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> * JumpInstructions are equal if they represent the same operation and<a name="line.41"></a>
<span class="sourceLineNo">042</span> * the instruction they jump to is the<a name="line.42"></a>
<span class="sourceLineNo">043</span> * same, or if the jump Instruction of either is unset.<a name="line.43"></a>
<span class="sourceLineNo">044</span> */<a name="line.44"></a>
<span class="sourceLineNo">045</span> public boolean equalsInstruction(Instruction other) {<a name="line.45"></a>
<span class="sourceLineNo">046</span> if (this == other)<a name="line.46"></a>
<span class="sourceLineNo">047</span> return true;<a name="line.47"></a>
<span class="sourceLineNo">048</span> if (!super.equalsInstruction(other))<a name="line.48"></a>
<span class="sourceLineNo">049</span> return false;<a name="line.49"></a>
<span class="sourceLineNo">050</span><a name="line.50"></a>
<span class="sourceLineNo">051</span> Instruction target = ((JumpInstruction) other).getTarget();<a name="line.51"></a>
<span class="sourceLineNo">052</span> return target == null || getTarget() == null || target == getTarget();<a name="line.52"></a>
<span class="sourceLineNo">053</span> }<a name="line.53"></a>
<span class="sourceLineNo">054</span><a name="line.54"></a>
<span class="sourceLineNo">055</span> public void updateTargets() {<a name="line.55"></a>
<span class="sourceLineNo">056</span> _target.updateTargets();<a name="line.56"></a>
<span class="sourceLineNo">057</span> }<a name="line.57"></a>
<span class="sourceLineNo">058</span><a name="line.58"></a>
<span class="sourceLineNo">059</span> public void replaceTarget(Instruction oldTarget, Instruction newTarget) {<a name="line.59"></a>
<span class="sourceLineNo">060</span> _target.replaceTarget(oldTarget, newTarget);<a name="line.60"></a>
<span class="sourceLineNo">061</span> }<a name="line.61"></a>
<span class="sourceLineNo">062</span><a name="line.62"></a>
<span class="sourceLineNo">063</span> public void acceptVisit(BCVisitor visit) {<a name="line.63"></a>
<span class="sourceLineNo">064</span> visit.enterJumpInstruction(this);<a name="line.64"></a>
<span class="sourceLineNo">065</span> visit.exitJumpInstruction(this);<a name="line.65"></a>
<span class="sourceLineNo">066</span> }<a name="line.66"></a>
<span class="sourceLineNo">067</span><a name="line.67"></a>
<span class="sourceLineNo">068</span> void read(Instruction orig) {<a name="line.68"></a>
<span class="sourceLineNo">069</span> super.read(orig);<a name="line.69"></a>
<span class="sourceLineNo">070</span> _target.setByteIndex(((JumpInstruction) orig)._target.getByteIndex());<a name="line.70"></a>
<span class="sourceLineNo">071</span> }<a name="line.71"></a>
<span class="sourceLineNo">072</span><a name="line.72"></a>
<span class="sourceLineNo">073</span> void read(DataInput in) throws IOException {<a name="line.73"></a>
<span class="sourceLineNo">074</span> super.read(in);<a name="line.74"></a>
<span class="sourceLineNo">075</span> switch (getOpcode()) {<a name="line.75"></a>
<span class="sourceLineNo">076</span> case Constants.GOTOW:<a name="line.76"></a>
<span class="sourceLineNo">077</span> case Constants.JSRW:<a name="line.77"></a>
<span class="sourceLineNo">078</span> _target.setByteIndex(getByteIndex() + in.readInt());<a name="line.78"></a>
<span class="sourceLineNo">079</span> break;<a name="line.79"></a>
<span class="sourceLineNo">080</span> default:<a name="line.80"></a>
<span class="sourceLineNo">081</span> _target.setByteIndex(getByteIndex() + in.readShort());<a name="line.81"></a>
<span class="sourceLineNo">082</span> }<a name="line.82"></a>
<span class="sourceLineNo">083</span> }<a name="line.83"></a>
<span class="sourceLineNo">084</span><a name="line.84"></a>
<span class="sourceLineNo">085</span> void write(DataOutput out) throws IOException {<a name="line.85"></a>
<span class="sourceLineNo">086</span> super.write(out);<a name="line.86"></a>
<span class="sourceLineNo">087</span> switch (getOpcode()) {<a name="line.87"></a>
<span class="sourceLineNo">088</span> case Constants.GOTOW:<a name="line.88"></a>
<span class="sourceLineNo">089</span> case Constants.JSRW:<a name="line.89"></a>
<span class="sourceLineNo">090</span> out.writeInt(_target.getByteIndex() - getByteIndex());<a name="line.90"></a>
<span class="sourceLineNo">091</span> break;<a name="line.91"></a>
<span class="sourceLineNo">092</span> default:<a name="line.92"></a>
<span class="sourceLineNo">093</span> out.writeShort(_target.getByteIndex() - getByteIndex());<a name="line.93"></a>
<span class="sourceLineNo">094</span> }<a name="line.94"></a>
<span class="sourceLineNo">095</span> }<a name="line.95"></a>
<span class="sourceLineNo">096</span><a name="line.96"></a>
<span class="sourceLineNo">097</span> public void setOffset(int offset) {<a name="line.97"></a>
<span class="sourceLineNo">098</span> _target.setByteIndex(getByteIndex() + offset);<a name="line.98"></a>
<span class="sourceLineNo">099</span> }<a name="line.99"></a>
<span class="sourceLineNo">100</span><a name="line.100"></a>
<span class="sourceLineNo">101</span> public int getOffset() {<a name="line.101"></a>
<span class="sourceLineNo">102</span> return _target.getByteIndex() - getByteIndex();<a name="line.102"></a>
<span class="sourceLineNo">103</span> }<a name="line.103"></a>
<span class="sourceLineNo">104</span>}<a name="line.104"></a>
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