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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 local tables mapping<a name="line.9"></a>
<span class="sourceLineNo">010</span> * locals used in opcodes to their names and descriptions.<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 LocalTable extends Attribute implements InstructionPtr {<a name="line.14"></a>
<span class="sourceLineNo">015</span> private List _locals = new ArrayList();<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span> LocalTable(int nameIndex, Attributes owner) {<a name="line.17"></a>
<span class="sourceLineNo">018</span> super(nameIndex, owner);<a name="line.18"></a>
<span class="sourceLineNo">019</span> }<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> * Return all the locals of this method.<a name="line.22"></a>
<span class="sourceLineNo">023</span> */<a name="line.23"></a>
<span class="sourceLineNo">024</span> public Local[] getLocals() {<a name="line.24"></a>
<span class="sourceLineNo">025</span> return (Local[]) _locals.toArray(newLocalArray(_locals.size()));<a name="line.25"></a>
<span class="sourceLineNo">026</span> }<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> * Return the local with the given locals index, or null if none.<a name="line.29"></a>
<span class="sourceLineNo">030</span> */<a name="line.30"></a>
<span class="sourceLineNo">031</span> public Local getLocal(int local) {<a name="line.31"></a>
<span class="sourceLineNo">032</span> for (int i = 0; i < _locals.size(); i++)<a name="line.32"></a>
<span class="sourceLineNo">033</span> if (((Local) _locals.get(i)).getLocal() == local)<a name="line.33"></a>
<span class="sourceLineNo">034</span> return (Local) _locals.get(i);<a name="line.34"></a>
<span class="sourceLineNo">035</span> return null;<a name="line.35"></a>
<span class="sourceLineNo">036</span> }<a name="line.36"></a>
<span class="sourceLineNo">037</span><a name="line.37"></a>
<span class="sourceLineNo">038</span> /**<a name="line.38"></a>
<span class="sourceLineNo">039</span> * Return the local with the given name, or null if none. If multiple<a name="line.39"></a>
<span class="sourceLineNo">040</span> * locals have the given name, which is returned is undefined.<a name="line.40"></a>
<span class="sourceLineNo">041</span> */<a name="line.41"></a>
<span class="sourceLineNo">042</span> public Local getLocal(String name) {<a name="line.42"></a>
<span class="sourceLineNo">043</span> String loc;<a name="line.43"></a>
<span class="sourceLineNo">044</span> for (int i = 0; i < _locals.size(); i++) {<a name="line.44"></a>
<span class="sourceLineNo">045</span> loc = ((Local) _locals.get(i)).getName();<a name="line.45"></a>
<span class="sourceLineNo">046</span> if ((loc == null && name == null) <a name="line.46"></a>
<span class="sourceLineNo">047</span> || (loc != null && loc.equals(name)))<a name="line.47"></a>
<span class="sourceLineNo">048</span> return (Local) _locals.get(i);<a name="line.48"></a>
<span class="sourceLineNo">049</span> }<a name="line.49"></a>
<span class="sourceLineNo">050</span> return null;<a name="line.50"></a>
<span class="sourceLineNo">051</span> }<a name="line.51"></a>
<span class="sourceLineNo">052</span><a name="line.52"></a>
<span class="sourceLineNo">053</span> /**<a name="line.53"></a>
<span class="sourceLineNo">054</span> * Return all locals with the given name, or empty array if none.<a name="line.54"></a>
<span class="sourceLineNo">055</span> */<a name="line.55"></a>
<span class="sourceLineNo">056</span> public Local[] getLocals(String name) {<a name="line.56"></a>
<span class="sourceLineNo">057</span> List matches = new LinkedList();<a name="line.57"></a>
<span class="sourceLineNo">058</span> String loc;<a name="line.58"></a>
<span class="sourceLineNo">059</span> for (int i = 0; i < _locals.size(); i++) {<a name="line.59"></a>
<span class="sourceLineNo">060</span> loc = ((Local) _locals.get(i)).getName();<a name="line.60"></a>
<span class="sourceLineNo">061</span> if ((loc == null && name == null) <a name="line.61"></a>
<span class="sourceLineNo">062</span> || (loc != null && loc.equals(name)))<a name="line.62"></a>
<span class="sourceLineNo">063</span> matches.add(_locals.get(i));<a name="line.63"></a>
<span class="sourceLineNo">064</span> }<a name="line.64"></a>
<span class="sourceLineNo">065</span> return (Local[]) matches.toArray(newLocalArray(matches.size()));<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> /**<a name="line.68"></a>
<span class="sourceLineNo">069</span> * Set the locals of this table. This method is useful when<a name="line.69"></a>
<span class="sourceLineNo">070</span> * importing locals from another method.<a name="line.70"></a>
<span class="sourceLineNo">071</span> */<a name="line.71"></a>
<span class="sourceLineNo">072</span> public void setLocals(Local[] locals) {<a name="line.72"></a>
<span class="sourceLineNo">073</span> clear();<a name="line.73"></a>
<span class="sourceLineNo">074</span> if (locals != null)<a name="line.74"></a>
<span class="sourceLineNo">075</span> for (int i = 0; i < locals.length; i++)<a name="line.75"></a>
<span class="sourceLineNo">076</span> addLocal(locals[i]);<a name="line.76"></a>
<span class="sourceLineNo">077</span> }<a name="line.77"></a>
<span class="sourceLineNo">078</span><a name="line.78"></a>
<span class="sourceLineNo">079</span> /**<a name="line.79"></a>
<span class="sourceLineNo">080</span> * Import a local from another method/class. Note that<a name="line.80"></a>
<span class="sourceLineNo">081</span> * the program counter and length from the given local is copied<a name="line.81"></a>
<span class="sourceLineNo">082</span> * directly, and thus will be incorrect unless this method is the same<a name="line.82"></a>
<span class="sourceLineNo">083</span> * as the one the local is copied from, or the pc and length are reset.<a name="line.83"></a>
<span class="sourceLineNo">084</span> */<a name="line.84"></a>
<span class="sourceLineNo">085</span> public Local addLocal(Local local) {<a name="line.85"></a>
<span class="sourceLineNo">086</span> Local newLocal = addLocal(local.getName(), local.getTypeName());<a name="line.86"></a>
<span class="sourceLineNo">087</span> newLocal.setStartPc(local.getStartPc());<a name="line.87"></a>
<span class="sourceLineNo">088</span> newLocal.setLength(local.getLength());<a name="line.88"></a>
<span class="sourceLineNo">089</span> return newLocal;<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> /**<a name="line.92"></a>
<span class="sourceLineNo">093</span> * Add a local to this table.<a name="line.93"></a>
<span class="sourceLineNo">094</span> */<a name="line.94"></a>
<span class="sourceLineNo">095</span> public Local addLocal() {<a name="line.95"></a>
<span class="sourceLineNo">096</span> Local local = newLocal();<a name="line.96"></a>
<span class="sourceLineNo">097</span> _locals.add(local);<a name="line.97"></a>
<span class="sourceLineNo">098</span> return local;<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> /**<a name="line.101"></a>
<span class="sourceLineNo">102</span> * Create a new element of this table.<a name="line.102"></a>
<span class="sourceLineNo">103</span> */<a name="line.103"></a>
<span class="sourceLineNo">104</span> protected abstract Local newLocal();<a name="line.104"></a>
<span class="sourceLineNo">105</span><a name="line.105"></a>
<span class="sourceLineNo">106</span> /**<a name="line.106"></a>
<span class="sourceLineNo">107</span> * Create a new array.<a name="line.107"></a>
<span class="sourceLineNo">108</span> */<a name="line.108"></a>
<span class="sourceLineNo">109</span> protected abstract Local[] newLocalArray(int size);<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> * Add a local to this table.<a name="line.112"></a>
<span class="sourceLineNo">113</span> */<a name="line.113"></a>
<span class="sourceLineNo">114</span> public Local addLocal(String name, String type) {<a name="line.114"></a>
<span class="sourceLineNo">115</span> Local local = addLocal();<a name="line.115"></a>
<span class="sourceLineNo">116</span> local.setName(name);<a name="line.116"></a>
<span class="sourceLineNo">117</span> local.setType(type);<a name="line.117"></a>
<span class="sourceLineNo">118</span> return local;<a name="line.118"></a>
<span class="sourceLineNo">119</span> }<a name="line.119"></a>
<span class="sourceLineNo">120</span><a name="line.120"></a>
<span class="sourceLineNo">121</span> /**<a name="line.121"></a>
<span class="sourceLineNo">122</span> * Clear all locals from this table.<a name="line.122"></a>
<span class="sourceLineNo">123</span> */<a name="line.123"></a>
<span class="sourceLineNo">124</span> public void clear() {<a name="line.124"></a>
<span class="sourceLineNo">125</span> for (int i = 0; i < _locals.size(); i++)<a name="line.125"></a>
<span class="sourceLineNo">126</span> ((Local) _locals.get(i)).invalidate();<a name="line.126"></a>
<span class="sourceLineNo">127</span> _locals.clear();<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> /**<a name="line.130"></a>
<span class="sourceLineNo">131</span> * Removes the local with the given locals index from the table.<a name="line.131"></a>
<span class="sourceLineNo">132</span> *<a name="line.132"></a>
<span class="sourceLineNo">133</span> * @return true if a local was removed, false otherwise<a name="line.133"></a>
<span class="sourceLineNo">134</span> */<a name="line.134"></a>
<span class="sourceLineNo">135</span> public boolean removeLocal(int local) {<a name="line.135"></a>
<span class="sourceLineNo">136</span> return removeLocal(getLocal(local));<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>
<span class="sourceLineNo">139</span> /**<a name="line.139"></a>
<span class="sourceLineNo">140</span> * Removes the local with the given name from this method.<a name="line.140"></a>
<span class="sourceLineNo">141</span> *<a name="line.141"></a>
<span class="sourceLineNo">142</span> * @return true if a local was removed, false otherwise<a name="line.142"></a>
<span class="sourceLineNo">143</span> */<a name="line.143"></a>
<span class="sourceLineNo">144</span> public boolean removeLocal(String name) {<a name="line.144"></a>
<span class="sourceLineNo">145</span> return removeLocal(getLocal(name));<a name="line.145"></a>
<span class="sourceLineNo">146</span> }<a name="line.146"></a>
<span class="sourceLineNo">147</span><a name="line.147"></a>
<span class="sourceLineNo">148</span> /**<a name="line.148"></a>
<span class="sourceLineNo">149</span> * Removes a local from this method. After this method, the local<a name="line.149"></a>
<span class="sourceLineNo">150</span> * will be invalid, and the result of any operations on it is undefined.<a name="line.150"></a>
<span class="sourceLineNo">151</span> *<a name="line.151"></a>
<span class="sourceLineNo">152</span> * @return true if a local was removed, false otherwise<a name="line.152"></a>
<span class="sourceLineNo">153</span> */<a name="line.153"></a>
<span class="sourceLineNo">154</span> public boolean removeLocal(Local local) {<a name="line.154"></a>
<span class="sourceLineNo">155</span> if (local == null || !_locals.remove(local))<a name="line.155"></a>
<span class="sourceLineNo">156</span> return false;<a name="line.156"></a>
<span class="sourceLineNo">157</span> local.invalidate();<a name="line.157"></a>
<span class="sourceLineNo">158</span> return true;<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> public void updateTargets() {<a name="line.161"></a>
<span class="sourceLineNo">162</span> for (int i = 0; i < _locals.size(); i++)<a name="line.162"></a>
<span class="sourceLineNo">163</span> ((Local) _locals.get(i)).updateTargets();<a name="line.163"></a>
<span class="sourceLineNo">164</span> }<a name="line.164"></a>
<span class="sourceLineNo">165</span><a name="line.165"></a>
<span class="sourceLineNo">166</span> public void replaceTarget(Instruction oldTarget, Instruction newTarget) {<a name="line.166"></a>
<span class="sourceLineNo">167</span> for (int i = 0; i < _locals.size(); i++)<a name="line.167"></a>
<span class="sourceLineNo">168</span> ((Local) _locals.get(i)).replaceTarget(oldTarget, newTarget);<a name="line.168"></a>
<span class="sourceLineNo">169</span> }<a name="line.169"></a>
<span class="sourceLineNo">170</span><a name="line.170"></a>
<span class="sourceLineNo">171</span> public Code getCode() {<a name="line.171"></a>
<span class="sourceLineNo">172</span> return (Code) getOwner();<a name="line.172"></a>
<span class="sourceLineNo">173</span> }<a name="line.173"></a>
<span class="sourceLineNo">174</span><a name="line.174"></a>
<span class="sourceLineNo">175</span> int getLength() {<a name="line.175"></a>
<span class="sourceLineNo">176</span> return 2 + (10 * _locals.size());<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 read(Attribute other) {<a name="line.179"></a>
<span class="sourceLineNo">180</span> setLocals(((LocalTable) other).getLocals());<a name="line.180"></a>
<span class="sourceLineNo">181</span> }<a name="line.181"></a>
<span class="sourceLineNo">182</span><a name="line.182"></a>
<span class="sourceLineNo">183</span> void read(DataInput in, int length) throws IOException {<a name="line.183"></a>
<span class="sourceLineNo">184</span> clear();<a name="line.184"></a>
<span class="sourceLineNo">185</span> int numLocals = in.readUnsignedShort();<a name="line.185"></a>
<span class="sourceLineNo">186</span> Local Local;<a name="line.186"></a>
<span class="sourceLineNo">187</span> for (int i = 0; i < numLocals; i++) {<a name="line.187"></a>
<span class="sourceLineNo">188</span> Local = addLocal();<a name="line.188"></a>
<span class="sourceLineNo">189</span> Local.read(in);<a name="line.189"></a>
<span class="sourceLineNo">190</span> }<a name="line.190"></a>
<span class="sourceLineNo">191</span> }<a name="line.191"></a>
<span class="sourceLineNo">192</span><a name="line.192"></a>
<span class="sourceLineNo">193</span> void write(DataOutput out, int length) throws IOException {<a name="line.193"></a>
<span class="sourceLineNo">194</span> out.writeShort(_locals.size());<a name="line.194"></a>
<span class="sourceLineNo">195</span> for (int i = 0; i < _locals.size(); i++)<a name="line.195"></a>
<span class="sourceLineNo">196</span> ((Local) _locals.get(i)).write(out);<a name="line.196"></a>
<span class="sourceLineNo">197</span> }<a name="line.197"></a>
<span class="sourceLineNo">198</span>}<a name="line.198"></a>
</pre>
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