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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.lowlevel.*;<a name="line.6"></a>
<span class="sourceLineNo">007</span>import serp.bytecode.visitor.*;<a name="line.7"></a>
<span class="sourceLineNo">008</span><a name="line.8"></a>
<span class="sourceLineNo">009</span>/**<a name="line.9"></a>
<span class="sourceLineNo">010</span> * A line number corresponds to a sequence of opcodes that map logically<a name="line.10"></a>
<span class="sourceLineNo">011</span> * to a line of source code.<a name="line.11"></a>
<span class="sourceLineNo">012</span> *<a name="line.12"></a>
<span class="sourceLineNo">013</span> * @author Abe White<a name="line.13"></a>
<span class="sourceLineNo">014</span> */<a name="line.14"></a>
<span class="sourceLineNo">015</span>public class LineNumber implements Comparable, InstructionPtr, BCEntity,<a name="line.15"></a>
<span class="sourceLineNo">016</span> VisitAcceptor {<a name="line.16"></a>
<span class="sourceLineNo">017</span> private int _line = 0;<a name="line.17"></a>
<span class="sourceLineNo">018</span> private LineNumberTable _owner = null;<a name="line.18"></a>
<span class="sourceLineNo">019</span> InstructionPtrStrategy _target = new InstructionPtrStrategy(this);<a name="line.19"></a>
<span class="sourceLineNo">020</span><a name="line.20"></a>
<span class="sourceLineNo">021</span> LineNumber(LineNumberTable owner) {<a name="line.21"></a>
<span class="sourceLineNo">022</span> _owner = owner;<a name="line.22"></a>
<span class="sourceLineNo">023</span> }<a name="line.23"></a>
<span class="sourceLineNo">024</span><a name="line.24"></a>
<span class="sourceLineNo">025</span> LineNumber(LineNumberTable owner, int startPc) {<a name="line.25"></a>
<span class="sourceLineNo">026</span> this(owner);<a name="line.26"></a>
<span class="sourceLineNo">027</span> setStartPc(startPc);<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> /**<a name="line.30"></a>
<span class="sourceLineNo">031</span> * Line numbers are stored in a {@link LineNumberTable}.<a name="line.31"></a>
<span class="sourceLineNo">032</span> */<a name="line.32"></a>
<span class="sourceLineNo">033</span> public LineNumberTable getTable() {<a name="line.33"></a>
<span class="sourceLineNo">034</span> return _owner;<a name="line.34"></a>
<span class="sourceLineNo">035</span> }<a name="line.35"></a>
<span class="sourceLineNo">036</span><a name="line.36"></a>
<span class="sourceLineNo">037</span> void invalidate() {<a name="line.37"></a>
<span class="sourceLineNo">038</span> _owner = null;<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> * Return source line number.<a name="line.42"></a>
<span class="sourceLineNo">043</span> */<a name="line.43"></a>
<span class="sourceLineNo">044</span> public int getLine() {<a name="line.44"></a>
<span class="sourceLineNo">045</span> return _line;<a name="line.45"></a>
<span class="sourceLineNo">046</span> }<a name="line.46"></a>
<span class="sourceLineNo">047</span><a name="line.47"></a>
<span class="sourceLineNo">048</span> /**<a name="line.48"></a>
<span class="sourceLineNo">049</span> * Set the source line number.<a name="line.49"></a>
<span class="sourceLineNo">050</span> */<a name="line.50"></a>
<span class="sourceLineNo">051</span> public void setLine(int lineNumber) {<a name="line.51"></a>
<span class="sourceLineNo">052</span> _line = lineNumber;<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> /**<a name="line.55"></a>
<span class="sourceLineNo">056</span> * Return the instruction marking the beginning of this line.<a name="line.56"></a>
<span class="sourceLineNo">057</span> */<a name="line.57"></a>
<span class="sourceLineNo">058</span> public Instruction getStart() {<a name="line.58"></a>
<span class="sourceLineNo">059</span> return _target.getTargetInstruction();<a name="line.59"></a>
<span class="sourceLineNo">060</span> }<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> * Return the index into the code byte array at which this line starts.<a name="line.63"></a>
<span class="sourceLineNo">064</span> */<a name="line.64"></a>
<span class="sourceLineNo">065</span> public int getStartPc() {<a name="line.65"></a>
<span class="sourceLineNo">066</span> return _target.getByteIndex();<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>
<span class="sourceLineNo">069</span> /**<a name="line.69"></a>
<span class="sourceLineNo">070</span> * Set the index into the code byte array at which this line starts.<a name="line.70"></a>
<span class="sourceLineNo">071</span> */<a name="line.71"></a>
<span class="sourceLineNo">072</span> public void setStartPc(int startPc) {<a name="line.72"></a>
<span class="sourceLineNo">073</span> _target.setByteIndex(startPc);<a name="line.73"></a>
<span class="sourceLineNo">074</span> }<a name="line.74"></a>
<span class="sourceLineNo">075</span><a name="line.75"></a>
<span class="sourceLineNo">076</span> /**<a name="line.76"></a>
<span class="sourceLineNo">077</span> * Set the {@link Instruction} marking the beginning this line.<a name="line.77"></a>
<span class="sourceLineNo">078</span> * The instruction must already be a part of the method.<a name="line.78"></a>
<span class="sourceLineNo">079</span> */<a name="line.79"></a>
<span class="sourceLineNo">080</span> public void setStart(Instruction instruction) {<a name="line.80"></a>
<span class="sourceLineNo">081</span> _target.setTargetInstruction(instruction);<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> public void updateTargets() {<a name="line.84"></a>
<span class="sourceLineNo">085</span> _target.updateTargets();<a name="line.85"></a>
<span class="sourceLineNo">086</span> }<a name="line.86"></a>
<span class="sourceLineNo">087</span><a name="line.87"></a>
<span class="sourceLineNo">088</span> public void replaceTarget(Instruction oldTarget, Instruction newTarget) {<a name="line.88"></a>
<span class="sourceLineNo">089</span> _target.replaceTarget(oldTarget, newTarget);<a name="line.89"></a>
<span class="sourceLineNo">090</span> }<a name="line.90"></a>
<span class="sourceLineNo">091</span><a name="line.91"></a>
<span class="sourceLineNo">092</span> public Project getProject() {<a name="line.92"></a>
<span class="sourceLineNo">093</span> return _owner.getProject();<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> public ConstantPool getPool() {<a name="line.96"></a>
<span class="sourceLineNo">097</span> return _owner.getPool();<a name="line.97"></a>
<span class="sourceLineNo">098</span> }<a name="line.98"></a>
<span class="sourceLineNo">099</span><a name="line.99"></a>
<span class="sourceLineNo">100</span> public ClassLoader getClassLoader() {<a name="line.100"></a>
<span class="sourceLineNo">101</span> return _owner.getClassLoader();<a name="line.101"></a>
<span class="sourceLineNo">102</span> }<a name="line.102"></a>
<span class="sourceLineNo">103</span><a name="line.103"></a>
<span class="sourceLineNo">104</span> public boolean isValid() {<a name="line.104"></a>
<span class="sourceLineNo">105</span> return _owner != null;<a name="line.105"></a>
<span class="sourceLineNo">106</span> }<a name="line.106"></a>
<span class="sourceLineNo">107</span><a name="line.107"></a>
<span class="sourceLineNo">108</span> public void acceptVisit(BCVisitor visit) {<a name="line.108"></a>
<span class="sourceLineNo">109</span> visit.enterLineNumber(this);<a name="line.109"></a>
<span class="sourceLineNo">110</span> visit.exitLineNumber(this);<a name="line.110"></a>
<span class="sourceLineNo">111</span> }<a name="line.111"></a>
<span class="sourceLineNo">112</span><a name="line.112"></a>
<span class="sourceLineNo">113</span> public int compareTo(Object other) {<a name="line.113"></a>
<span class="sourceLineNo">114</span> if (!(other instanceof LineNumber))<a name="line.114"></a>
<span class="sourceLineNo">115</span> return -1;<a name="line.115"></a>
<span class="sourceLineNo">116</span><a name="line.116"></a>
<span class="sourceLineNo">117</span> LineNumber ln = (LineNumber) other;<a name="line.117"></a>
<span class="sourceLineNo">118</span> if (getStartPc() == ln.getStartPc())<a name="line.118"></a>
<span class="sourceLineNo">119</span> return 0;<a name="line.119"></a>
<span class="sourceLineNo">120</span> if (getStartPc() < ln.getStartPc())<a name="line.120"></a>
<span class="sourceLineNo">121</span> return -1;<a name="line.121"></a>
<span class="sourceLineNo">122</span> return 1;<a name="line.122"></a>
<span class="sourceLineNo">123</span> }<a name="line.123"></a>
<span class="sourceLineNo">124</span><a name="line.124"></a>
<span class="sourceLineNo">125</span> void read(DataInput in) throws IOException {<a name="line.125"></a>
<span class="sourceLineNo">126</span> setStartPc(in.readUnsignedShort());<a name="line.126"></a>
<span class="sourceLineNo">127</span> setLine(in.readUnsignedShort());<a name="line.127"></a>
<span class="sourceLineNo">128</span> }<a name="line.128"></a>
<span class="sourceLineNo">129</span><a name="line.129"></a>
<span class="sourceLineNo">130</span> void write(DataOutput out) throws IOException {<a name="line.130"></a>
<span class="sourceLineNo">131</span> out.writeShort(getStartPc());<a name="line.131"></a>
<span class="sourceLineNo">132</span> out.writeShort(getLine());<a name="line.132"></a>
<span class="sourceLineNo">133</span> }<a name="line.133"></a>
<span class="sourceLineNo">134</span><a name="line.134"></a>
<span class="sourceLineNo">135</span> public Code getCode() {<a name="line.135"></a>
<span class="sourceLineNo">136</span> return _owner.getCode();<a name="line.136"></a>
<span class="sourceLineNo">137</span> }<a name="line.137"></a>
<span class="sourceLineNo">138</span>}<a name="line.138"></a>
</pre>
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