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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> * Code blocks compiled from source have line number tables mapping<a name="line.9"></a>
<span class="sourceLineNo">010</span> * opcodes to source lines. This table automatically maintains line<a name="line.10"></a>
<span class="sourceLineNo">011</span> * numbers in ascending order by their start program counter position<a name="line.11"></a>
<span class="sourceLineNo">012</span> * at all times.<a name="line.12"></a>
<span class="sourceLineNo">013</span> *<a name="line.13"></a>
<span class="sourceLineNo">014</span> * @author Abe White<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span>public class LineNumberTable extends Attribute implements InstructionPtr {<a name="line.16"></a>
<span class="sourceLineNo">017</span> private List _lineNumbers = new ArrayList();<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span> LineNumberTable(int nameIndex, Attributes owner) {<a name="line.19"></a>
<span class="sourceLineNo">020</span> super(nameIndex, owner);<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> /**<a name="line.23"></a>
<span class="sourceLineNo">024</span> * Return the line numbers held in this table.<a name="line.24"></a>
<span class="sourceLineNo">025</span> */<a name="line.25"></a>
<span class="sourceLineNo">026</span> public LineNumber[] getLineNumbers() {<a name="line.26"></a>
<span class="sourceLineNo">027</span> Collections.sort(_lineNumbers);<a name="line.27"></a>
<span class="sourceLineNo">028</span> return (LineNumber[]) _lineNumbers.toArray<a name="line.28"></a>
<span class="sourceLineNo">029</span> (new LineNumber[_lineNumbers.size()]);<a name="line.29"></a>
<span class="sourceLineNo">030</span> }<a name="line.30"></a>
<span class="sourceLineNo">031</span><a name="line.31"></a>
<span class="sourceLineNo">032</span> /**<a name="line.32"></a>
<span class="sourceLineNo">033</span> * Return the line number for the given program counter, or null if none.<a name="line.33"></a>
<span class="sourceLineNo">034</span> */<a name="line.34"></a>
<span class="sourceLineNo">035</span> public LineNumber getLineNumber(int pc) {<a name="line.35"></a>
<span class="sourceLineNo">036</span> for (int i = _lineNumbers.size() - 1; i >= 0; i--)<a name="line.36"></a>
<span class="sourceLineNo">037</span> if (((LineNumber) _lineNumbers.get(i))._target.getByteIndex() <= pc)<a name="line.37"></a>
<span class="sourceLineNo">038</span> return (LineNumber) _lineNumbers.get(i);<a name="line.38"></a>
<span class="sourceLineNo">039</span> return null;<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> /**<a name="line.42"></a>
<span class="sourceLineNo">043</span> * Return the line number for the given instruction, or null if none.<a name="line.43"></a>
<span class="sourceLineNo">044</span> */<a name="line.44"></a>
<span class="sourceLineNo">045</span> public LineNumber getLineNumber(Instruction ins) {<a name="line.45"></a>
<span class="sourceLineNo">046</span> if (ins == null)<a name="line.46"></a>
<span class="sourceLineNo">047</span> return null;<a name="line.47"></a>
<span class="sourceLineNo">048</span> return getLineNumber(ins.getByteIndex());<a name="line.48"></a>
<span class="sourceLineNo">049</span> }<a name="line.49"></a>
<span class="sourceLineNo">050</span><a name="line.50"></a>
<span class="sourceLineNo">051</span> /**<a name="line.51"></a>
<span class="sourceLineNo">052</span> * Set the line numbers for the table. This method is useful when<a name="line.52"></a>
<span class="sourceLineNo">053</span> * importing line numbers from another method.<a name="line.53"></a>
<span class="sourceLineNo">054</span> */<a name="line.54"></a>
<span class="sourceLineNo">055</span> public void setLineNumbers(LineNumber[] lines) {<a name="line.55"></a>
<span class="sourceLineNo">056</span> clear();<a name="line.56"></a>
<span class="sourceLineNo">057</span> if (lines != null)<a name="line.57"></a>
<span class="sourceLineNo">058</span> for (int i = 0; i < lines.length; i++)<a name="line.58"></a>
<span class="sourceLineNo">059</span> addLineNumber(lines[i]);<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> * Import a line number from another method.<a name="line.63"></a>
<span class="sourceLineNo">064</span> *<a name="line.64"></a>
<span class="sourceLineNo">065</span> * @return the newly added line number<a name="line.65"></a>
<span class="sourceLineNo">066</span> */<a name="line.66"></a>
<span class="sourceLineNo">067</span> public LineNumber addLineNumber(LineNumber ln) {<a name="line.67"></a>
<span class="sourceLineNo">068</span> LineNumber line = addLineNumber();<a name="line.68"></a>
<span class="sourceLineNo">069</span> line.setStartPc(ln.getStartPc());<a name="line.69"></a>
<span class="sourceLineNo">070</span> line.setLine(ln.getLine());<a name="line.70"></a>
<span class="sourceLineNo">071</span> return line;<a name="line.71"></a>
<span class="sourceLineNo">072</span> }<a name="line.72"></a>
<span class="sourceLineNo">073</span><a name="line.73"></a>
<span class="sourceLineNo">074</span> /**<a name="line.74"></a>
<span class="sourceLineNo">075</span> * Add a new line number to this table.<a name="line.75"></a>
<span class="sourceLineNo">076</span> */<a name="line.76"></a>
<span class="sourceLineNo">077</span> public LineNumber addLineNumber() {<a name="line.77"></a>
<span class="sourceLineNo">078</span> LineNumber ln = new LineNumber(this);<a name="line.78"></a>
<span class="sourceLineNo">079</span> _lineNumbers.add(ln);<a name="line.79"></a>
<span class="sourceLineNo">080</span> return ln;<a name="line.80"></a>
<span class="sourceLineNo">081</span> }<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> * Add a new line number to this table.<a name="line.84"></a>
<span class="sourceLineNo">085</span> */<a name="line.85"></a>
<span class="sourceLineNo">086</span> public LineNumber addLineNumber(int startPc, int line) {<a name="line.86"></a>
<span class="sourceLineNo">087</span> LineNumber ln = addLineNumber();<a name="line.87"></a>
<span class="sourceLineNo">088</span> ln.setStartPc(startPc);<a name="line.88"></a>
<span class="sourceLineNo">089</span> ln.setLine(line);<a name="line.89"></a>
<span class="sourceLineNo">090</span> return ln;<a name="line.90"></a>
<span class="sourceLineNo">091</span> }<a name="line.91"></a>
<span class="sourceLineNo">092</span><a name="line.92"></a>
<span class="sourceLineNo">093</span> /**<a name="line.93"></a>
<span class="sourceLineNo">094</span> * Add a new line number to this table.<a name="line.94"></a>
<span class="sourceLineNo">095</span> */<a name="line.95"></a>
<span class="sourceLineNo">096</span> public LineNumber addLineNumber(Instruction start, int line) {<a name="line.96"></a>
<span class="sourceLineNo">097</span> LineNumber ln = addLineNumber();<a name="line.97"></a>
<span class="sourceLineNo">098</span> ln.setStart(start);<a name="line.98"></a>
<span class="sourceLineNo">099</span> ln.setLine(line);<a name="line.99"></a>
<span class="sourceLineNo">100</span> return ln;<a name="line.100"></a>
<span class="sourceLineNo">101</span> }<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> * Clear the line numbers.<a name="line.104"></a>
<span class="sourceLineNo">105</span> */<a name="line.105"></a>
<span class="sourceLineNo">106</span> public void clear() {<a name="line.106"></a>
<span class="sourceLineNo">107</span> for (int i = 0; i < _lineNumbers.size(); i++)<a name="line.107"></a>
<span class="sourceLineNo">108</span> ((LineNumber) _lineNumbers.get(i)).invalidate();<a name="line.108"></a>
<span class="sourceLineNo">109</span> _lineNumbers.clear();<a name="line.109"></a>
<span class="sourceLineNo">110</span> }<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> * Remove the given line.<a name="line.113"></a>
<span class="sourceLineNo">114</span> *<a name="line.114"></a>
<span class="sourceLineNo">115</span> * @return true if the line was removed, false otherwise<a name="line.115"></a>
<span class="sourceLineNo">116</span> */<a name="line.116"></a>
<span class="sourceLineNo">117</span> public boolean removeLineNumber(LineNumber ln) {<a name="line.117"></a>
<span class="sourceLineNo">118</span> if (ln == null || !_lineNumbers.remove(ln))<a name="line.118"></a>
<span class="sourceLineNo">119</span> return false;<a name="line.119"></a>
<span class="sourceLineNo">120</span> ln.invalidate();<a name="line.120"></a>
<span class="sourceLineNo">121</span> return true;<a name="line.121"></a>
<span class="sourceLineNo">122</span> }<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> * Remove the line number for the given program counter.<a name="line.125"></a>
<span class="sourceLineNo">126</span> *<a name="line.126"></a>
<span class="sourceLineNo">127</span> * @return true if the line was removed, false otherwise<a name="line.127"></a>
<span class="sourceLineNo">128</span> */<a name="line.128"></a>
<span class="sourceLineNo">129</span> public boolean removeLineNumber(int pc) {<a name="line.129"></a>
<span class="sourceLineNo">130</span> return removeLineNumber(getLineNumber(pc));<a name="line.130"></a>
<span class="sourceLineNo">131</span> }<a name="line.131"></a>
<span class="sourceLineNo">132</span><a name="line.132"></a>
<span class="sourceLineNo">133</span> /**<a name="line.133"></a>
<span class="sourceLineNo">134</span> * Remove the line number for the given instruction.<a name="line.134"></a>
<span class="sourceLineNo">135</span> *<a name="line.135"></a>
<span class="sourceLineNo">136</span> * @return true if the line was removed, false otherwise<a name="line.136"></a>
<span class="sourceLineNo">137</span> */<a name="line.137"></a>
<span class="sourceLineNo">138</span> public boolean removeLineNumber(Instruction ins) {<a name="line.138"></a>
<span class="sourceLineNo">139</span> return removeLineNumber(getLineNumber(ins));<a name="line.139"></a>
<span class="sourceLineNo">140</span> }<a name="line.140"></a>
<span class="sourceLineNo">141</span><a name="line.141"></a>
<span class="sourceLineNo">142</span> public void updateTargets() {<a name="line.142"></a>
<span class="sourceLineNo">143</span> for (int i = 0; i < _lineNumbers.size(); i++)<a name="line.143"></a>
<span class="sourceLineNo">144</span> ((LineNumber) _lineNumbers.get(i)).updateTargets();<a name="line.144"></a>
<span class="sourceLineNo">145</span> }<a name="line.145"></a>
<span class="sourceLineNo">146</span><a name="line.146"></a>
<span class="sourceLineNo">147</span> public void replaceTarget(Instruction oldTarget, Instruction newTarget) {<a name="line.147"></a>
<span class="sourceLineNo">148</span> for (int i = 0; i < _lineNumbers.size(); i++)<a name="line.148"></a>
<span class="sourceLineNo">149</span> ((LineNumber) _lineNumbers.get(i)).replaceTarget(oldTarget,<a name="line.149"></a>
<span class="sourceLineNo">150</span> newTarget);<a name="line.150"></a>
<span class="sourceLineNo">151</span> }<a name="line.151"></a>
<span class="sourceLineNo">152</span><a name="line.152"></a>
<span class="sourceLineNo">153</span> public void acceptVisit(BCVisitor visit) {<a name="line.153"></a>
<span class="sourceLineNo">154</span> visit.enterLineNumberTable(this);<a name="line.154"></a>
<span class="sourceLineNo">155</span> LineNumber[] lines = getLineNumbers();<a name="line.155"></a>
<span class="sourceLineNo">156</span> for (int i = 0; i < lines.length; i++)<a name="line.156"></a>
<span class="sourceLineNo">157</span> lines[i].acceptVisit(visit);<a name="line.157"></a>
<span class="sourceLineNo">158</span> visit.exitLineNumberTable(this);<a name="line.158"></a>
<span class="sourceLineNo">159</span> }<a name="line.159"></a>
<span class="sourceLineNo">160</span><a name="line.160"></a>
<span class="sourceLineNo">161</span> int getLength() {<a name="line.161"></a>
<span class="sourceLineNo">162</span> return 2 + (4 * _lineNumbers.size());<a name="line.162"></a>
<span class="sourceLineNo">163</span> }<a name="line.163"></a>
<span class="sourceLineNo">164</span><a name="line.164"></a>
<span class="sourceLineNo">165</span> void read(Attribute other) {<a name="line.165"></a>
<span class="sourceLineNo">166</span> setLineNumbers(((LineNumberTable) other).getLineNumbers());<a name="line.166"></a>
<span class="sourceLineNo">167</span> }<a name="line.167"></a>
<span class="sourceLineNo">168</span><a name="line.168"></a>
<span class="sourceLineNo">169</span> void read(DataInput in, int length) throws IOException {<a name="line.169"></a>
<span class="sourceLineNo">170</span> clear();<a name="line.170"></a>
<span class="sourceLineNo">171</span> int numLines = in.readUnsignedShort();<a name="line.171"></a>
<span class="sourceLineNo">172</span> LineNumber lineNumber;<a name="line.172"></a>
<span class="sourceLineNo">173</span> for (int i = 0; i < numLines; i++) {<a name="line.173"></a>
<span class="sourceLineNo">174</span> lineNumber = addLineNumber();<a name="line.174"></a>
<span class="sourceLineNo">175</span> lineNumber.read(in);<a name="line.175"></a>
<span class="sourceLineNo">176</span> }<a name="line.176"></a>
<span class="sourceLineNo">177</span> }<a name="line.177"></a>
<span class="sourceLineNo">178</span><a name="line.178"></a>
<span class="sourceLineNo">179</span> void write(DataOutput out, int length) throws IOException {<a name="line.179"></a>
<span class="sourceLineNo">180</span> LineNumber[] lines = getLineNumbers();<a name="line.180"></a>
<span class="sourceLineNo">181</span> out.writeShort(lines.length);<a name="line.181"></a>
<span class="sourceLineNo">182</span> for (int i = 0; i < lines.length; i++)<a name="line.182"></a>
<span class="sourceLineNo">183</span> lines[i].write(out);<a name="line.183"></a>
<span class="sourceLineNo">184</span> }<a name="line.184"></a>
<span class="sourceLineNo">185</span><a name="line.185"></a>
<span class="sourceLineNo">186</span> public Code getCode() {<a name="line.186"></a>
<span class="sourceLineNo">187</span> return (Code) getOwner();<a name="line.187"></a>
<span class="sourceLineNo">188</span> }<a name="line.188"></a>
<span class="sourceLineNo">189</span>}<a name="line.189"></a>
</pre>
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