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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> * The <code>tableswitch</code> instruction.<a name="line.9"></a>
<span class="sourceLineNo">010</span> *<a name="line.10"></a>
<span class="sourceLineNo">011</span> * @author Abe White<a name="line.11"></a>
<span class="sourceLineNo">012</span> */<a name="line.12"></a>
<span class="sourceLineNo">013</span>public class TableSwitchInstruction extends JumpInstruction {<a name="line.13"></a>
<span class="sourceLineNo">014</span> // case info<a name="line.14"></a>
<span class="sourceLineNo">015</span> private int _low = 0;<a name="line.15"></a>
<span class="sourceLineNo">016</span> private int _high = 0;<a name="line.16"></a>
<span class="sourceLineNo">017</span> private List _cases = new LinkedList();<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span> TableSwitchInstruction(Code owner) {<a name="line.19"></a>
<span class="sourceLineNo">020</span> super(owner, Constants.TABLESWITCH);<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> * Returns the current byte offsets for the different<a name="line.24"></a>
<span class="sourceLineNo">025</span> * switch cases in this Instruction.<a name="line.25"></a>
<span class="sourceLineNo">026</span> */<a name="line.26"></a>
<span class="sourceLineNo">027</span> public int[] getOffsets() {<a name="line.27"></a>
<span class="sourceLineNo">028</span> int bi = getByteIndex();<a name="line.28"></a>
<span class="sourceLineNo">029</span> int[] offsets = new int[_cases.size()];<a name="line.29"></a>
<span class="sourceLineNo">030</span> for (int i = 0; i < _cases.size(); i++)<a name="line.30"></a>
<span class="sourceLineNo">031</span> offsets[i] = ((InstructionPtrStrategy) _cases.get(i)).getByteIndex()<a name="line.31"></a>
<span class="sourceLineNo">032</span> - bi;<a name="line.32"></a>
<span class="sourceLineNo">033</span> return offsets;<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> /**<a name="line.36"></a>
<span class="sourceLineNo">037</span> * Sets the offsets for the instructions representing the different<a name="line.37"></a>
<span class="sourceLineNo">038</span> * switch statement cases. WARNING: these offsets will not be changed<a name="line.38"></a>
<span class="sourceLineNo">039</span> * in the event that the code is modified following this call. It is<a name="line.39"></a>
<span class="sourceLineNo">040</span> * typically a good idea to follow this call with a call to updateTargets<a name="line.40"></a>
<span class="sourceLineNo">041</span> * as soon as the instructions at the given offsets are valid, at which<a name="line.41"></a>
<span class="sourceLineNo">042</span> * point the Instructions themselves will be used as the targets and the<a name="line.42"></a>
<span class="sourceLineNo">043</span> * offsets will be updated as expected.<a name="line.43"></a>
<span class="sourceLineNo">044</span> */<a name="line.44"></a>
<span class="sourceLineNo">045</span> public void setOffsets(int[] offsets) {<a name="line.45"></a>
<span class="sourceLineNo">046</span> int bi = getByteIndex();<a name="line.46"></a>
<span class="sourceLineNo">047</span> _cases.clear();<a name="line.47"></a>
<span class="sourceLineNo">048</span> for (int i = 0; i < offsets.length; i++) {<a name="line.48"></a>
<span class="sourceLineNo">049</span> InstructionPtrStrategy next = new InstructionPtrStrategy(this);<a name="line.49"></a>
<span class="sourceLineNo">050</span> next.setByteIndex(offsets[i] + bi);<a name="line.50"></a>
<span class="sourceLineNo">051</span> _cases.add(next);<a name="line.51"></a>
<span class="sourceLineNo">052</span> }<a name="line.52"></a>
<span class="sourceLineNo">053</span> invalidateByteIndexes();<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> int getLength() {<a name="line.56"></a>
<span class="sourceLineNo">057</span> // don't call super<a name="line.57"></a>
<span class="sourceLineNo">058</span> int length = 1;<a name="line.58"></a>
<span class="sourceLineNo">059</span><a name="line.59"></a>
<span class="sourceLineNo">060</span> // make the first byte of the 'default' a multiple of 4 from the<a name="line.60"></a>
<span class="sourceLineNo">061</span> // start of the method<a name="line.61"></a>
<span class="sourceLineNo">062</span> int byteIndex = getByteIndex() + 1;<a name="line.62"></a>
<span class="sourceLineNo">063</span> for (; (byteIndex % 4) != 0; byteIndex++, length++);<a name="line.63"></a>
<span class="sourceLineNo">064</span><a name="line.64"></a>
<span class="sourceLineNo">065</span> // default, low, high<a name="line.65"></a>
<span class="sourceLineNo">066</span> length += 12;<a name="line.66"></a>
<span class="sourceLineNo">067</span><a name="line.67"></a>
<span class="sourceLineNo">068</span> // offsets<a name="line.68"></a>
<span class="sourceLineNo">069</span> length += (4 * _cases.size());<a name="line.69"></a>
<span class="sourceLineNo">070</span> return length;<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> /**<a name="line.73"></a>
<span class="sourceLineNo">074</span> * Synonymous with {@link #getTarget}.<a name="line.74"></a>
<span class="sourceLineNo">075</span> */<a name="line.75"></a>
<span class="sourceLineNo">076</span> public Instruction getDefaultTarget() {<a name="line.76"></a>
<span class="sourceLineNo">077</span> return getTarget();<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> /**<a name="line.80"></a>
<span class="sourceLineNo">081</span> * Synonymous with {@link #setTarget}.<a name="line.81"></a>
<span class="sourceLineNo">082</span> */<a name="line.82"></a>
<span class="sourceLineNo">083</span> public TableSwitchInstruction setDefaultTarget(Instruction ins) {<a name="line.83"></a>
<span class="sourceLineNo">084</span> return (TableSwitchInstruction) setTarget(ins);<a name="line.84"></a>
<span class="sourceLineNo">085</span> }<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> * Synonymous with {@link #getOffset}.<a name="line.88"></a>
<span class="sourceLineNo">089</span> */<a name="line.89"></a>
<span class="sourceLineNo">090</span> public int getDefaultOffset() {<a name="line.90"></a>
<span class="sourceLineNo">091</span> return getOffset();<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> /**<a name="line.94"></a>
<span class="sourceLineNo">095</span> * Synonymous with {@link #setOffset}.<a name="line.95"></a>
<span class="sourceLineNo">096</span> */<a name="line.96"></a>
<span class="sourceLineNo">097</span> public TableSwitchInstruction setDefaultOffset(int offset) {<a name="line.97"></a>
<span class="sourceLineNo">098</span> setOffset(offset);<a name="line.98"></a>
<span class="sourceLineNo">099</span> return this;<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> public int getLow() {<a name="line.102"></a>
<span class="sourceLineNo">103</span> return _low;<a name="line.103"></a>
<span class="sourceLineNo">104</span> }<a name="line.104"></a>
<span class="sourceLineNo">105</span><a name="line.105"></a>
<span class="sourceLineNo">106</span> public TableSwitchInstruction setLow(int low) {<a name="line.106"></a>
<span class="sourceLineNo">107</span> _low = low;<a name="line.107"></a>
<span class="sourceLineNo">108</span> return this;<a name="line.108"></a>
<span class="sourceLineNo">109</span> }<a name="line.109"></a>
<span class="sourceLineNo">110</span><a name="line.110"></a>
<span class="sourceLineNo">111</span> public int getHigh() {<a name="line.111"></a>
<span class="sourceLineNo">112</span> return _high;<a name="line.112"></a>
<span class="sourceLineNo">113</span> }<a name="line.113"></a>
<span class="sourceLineNo">114</span><a name="line.114"></a>
<span class="sourceLineNo">115</span> public TableSwitchInstruction setHigh(int high) {<a name="line.115"></a>
<span class="sourceLineNo">116</span> _high = high;<a name="line.116"></a>
<span class="sourceLineNo">117</span> return this;<a name="line.117"></a>
<span class="sourceLineNo">118</span> }<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> * Return the targets for this switch, or empty array if not set.<a name="line.121"></a>
<span class="sourceLineNo">122</span> */<a name="line.122"></a>
<span class="sourceLineNo">123</span> public Instruction[] getTargets() {<a name="line.123"></a>
<span class="sourceLineNo">124</span> Instruction[] result = new Instruction[_cases.size()];<a name="line.124"></a>
<span class="sourceLineNo">125</span> for (int i = 0; i < _cases.size(); i++)<a name="line.125"></a>
<span class="sourceLineNo">126</span> result[i] = ((InstructionPtrStrategy) _cases.get(i)).<a name="line.126"></a>
<span class="sourceLineNo">127</span> getTargetInstruction();<a name="line.127"></a>
<span class="sourceLineNo">128</span> return result;<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> /**<a name="line.131"></a>
<span class="sourceLineNo">132</span> * Set the jump points for this switch.<a name="line.132"></a>
<span class="sourceLineNo">133</span> *<a name="line.133"></a>
<span class="sourceLineNo">134</span> * @return this instruction, for method chaining<a name="line.134"></a>
<span class="sourceLineNo">135</span> */<a name="line.135"></a>
<span class="sourceLineNo">136</span> public TableSwitchInstruction setTargets(Instruction[] targets) {<a name="line.136"></a>
<span class="sourceLineNo">137</span> _cases.clear();<a name="line.137"></a>
<span class="sourceLineNo">138</span> if (targets != null)<a name="line.138"></a>
<span class="sourceLineNo">139</span> for (int i = 0; i < targets.length; i++)<a name="line.139"></a>
<span class="sourceLineNo">140</span> addTarget(targets[i]);<a name="line.140"></a>
<span class="sourceLineNo">141</span> return this;<a name="line.141"></a>
<span class="sourceLineNo">142</span> }<a name="line.142"></a>
<span class="sourceLineNo">143</span><a name="line.143"></a>
<span class="sourceLineNo">144</span> /**<a name="line.144"></a>
<span class="sourceLineNo">145</span> * Add a target to this switch.<a name="line.145"></a>
<span class="sourceLineNo">146</span> *<a name="line.146"></a>
<span class="sourceLineNo">147</span> * @return this instruction, for method chaining<a name="line.147"></a>
<span class="sourceLineNo">148</span> */<a name="line.148"></a>
<span class="sourceLineNo">149</span> public TableSwitchInstruction addTarget(Instruction target) {<a name="line.149"></a>
<span class="sourceLineNo">150</span> _cases.add(new InstructionPtrStrategy(this, target));<a name="line.150"></a>
<span class="sourceLineNo">151</span> invalidateByteIndexes();<a name="line.151"></a>
<span class="sourceLineNo">152</span> return this;<a name="line.152"></a>
<span class="sourceLineNo">153</span> }<a name="line.153"></a>
<span class="sourceLineNo">154</span><a name="line.154"></a>
<span class="sourceLineNo">155</span> public int getStackChange() {<a name="line.155"></a>
<span class="sourceLineNo">156</span> return -1;<a name="line.156"></a>
<span class="sourceLineNo">157</span> }<a name="line.157"></a>
<span class="sourceLineNo">158</span><a name="line.158"></a>
<span class="sourceLineNo">159</span> private Instruction findTarget(int jumpByteIndex, List inss) {<a name="line.159"></a>
<span class="sourceLineNo">160</span> Instruction ins;<a name="line.160"></a>
<span class="sourceLineNo">161</span> for (Iterator itr = inss.iterator(); itr.hasNext();) {<a name="line.161"></a>
<span class="sourceLineNo">162</span> ins = (Instruction) itr.next();<a name="line.162"></a>
<span class="sourceLineNo">163</span> if (ins.getByteIndex() == jumpByteIndex)<a name="line.163"></a>
<span class="sourceLineNo">164</span> return ins;<a name="line.164"></a>
<span class="sourceLineNo">165</span> }<a name="line.165"></a>
<span class="sourceLineNo">166</span> return null;<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> public void updateTargets() {<a name="line.169"></a>
<span class="sourceLineNo">170</span> super.updateTargets();<a name="line.170"></a>
<span class="sourceLineNo">171</span> for (Iterator itr = _cases.iterator(); itr.hasNext();)<a name="line.171"></a>
<span class="sourceLineNo">172</span> ((InstructionPtrStrategy) itr.next()).updateTargets();<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> public void replaceTarget(Instruction oldTarget, Instruction newTarget) {<a name="line.175"></a>
<span class="sourceLineNo">176</span> super.replaceTarget(oldTarget, newTarget);<a name="line.176"></a>
<span class="sourceLineNo">177</span> for (Iterator itr = _cases.iterator(); itr.hasNext();)<a name="line.177"></a>
<span class="sourceLineNo">178</span> ((InstructionPtrStrategy) itr.next()).replaceTarget(oldTarget,<a name="line.178"></a>
<span class="sourceLineNo">179</span> newTarget);<a name="line.179"></a>
<span class="sourceLineNo">180</span> }<a name="line.180"></a>
<span class="sourceLineNo">181</span><a name="line.181"></a>
<span class="sourceLineNo">182</span> public void acceptVisit(BCVisitor visit) {<a name="line.182"></a>
<span class="sourceLineNo">183</span> visit.enterTableSwitchInstruction(this);<a name="line.183"></a>
<span class="sourceLineNo">184</span> visit.exitTableSwitchInstruction(this);<a name="line.184"></a>
<span class="sourceLineNo">185</span> }<a name="line.185"></a>
<span class="sourceLineNo">186</span><a name="line.186"></a>
<span class="sourceLineNo">187</span> void read(Instruction orig) {<a name="line.187"></a>
<span class="sourceLineNo">188</span> super.read(orig);<a name="line.188"></a>
<span class="sourceLineNo">189</span><a name="line.189"></a>
<span class="sourceLineNo">190</span> TableSwitchInstruction ins = (TableSwitchInstruction) orig;<a name="line.190"></a>
<span class="sourceLineNo">191</span> setLow(ins.getLow());<a name="line.191"></a>
<span class="sourceLineNo">192</span> setHigh(ins.getHigh());<a name="line.192"></a>
<span class="sourceLineNo">193</span> InstructionPtrStrategy incoming;<a name="line.193"></a>
<span class="sourceLineNo">194</span> for (Iterator itr = ins._cases.iterator(); itr.hasNext();) {<a name="line.194"></a>
<span class="sourceLineNo">195</span> incoming = (InstructionPtrStrategy) itr.next();<a name="line.195"></a>
<span class="sourceLineNo">196</span> InstructionPtrStrategy next = new InstructionPtrStrategy(this);<a name="line.196"></a>
<span class="sourceLineNo">197</span> next.setByteIndex(incoming.getByteIndex());<a name="line.197"></a>
<span class="sourceLineNo">198</span> _cases.add(next);<a name="line.198"></a>
<span class="sourceLineNo">199</span> }<a name="line.199"></a>
<span class="sourceLineNo">200</span> invalidateByteIndexes();<a name="line.200"></a>
<span class="sourceLineNo">201</span> }<a name="line.201"></a>
<span class="sourceLineNo">202</span><a name="line.202"></a>
<span class="sourceLineNo">203</span> void read(DataInput in) throws IOException {<a name="line.203"></a>
<span class="sourceLineNo">204</span> // don't call super<a name="line.204"></a>
<span class="sourceLineNo">205</span> int bi = getByteIndex();<a name="line.205"></a>
<span class="sourceLineNo">206</span> for (int byteIndex = bi + 1; (byteIndex % 4) != 0; byteIndex++)<a name="line.206"></a>
<span class="sourceLineNo">207</span> in.readByte();<a name="line.207"></a>
<span class="sourceLineNo">208</span><a name="line.208"></a>
<span class="sourceLineNo">209</span> setOffset(in.readInt());<a name="line.209"></a>
<span class="sourceLineNo">210</span> setLow(in.readInt());<a name="line.210"></a>
<span class="sourceLineNo">211</span> setHigh(in.readInt());<a name="line.211"></a>
<span class="sourceLineNo">212</span> _cases.clear();<a name="line.212"></a>
<span class="sourceLineNo">213</span> for (int i = 0; i < (_high - _low + 1); i++) {<a name="line.213"></a>
<span class="sourceLineNo">214</span> InstructionPtrStrategy next = new InstructionPtrStrategy(this);<a name="line.214"></a>
<span class="sourceLineNo">215</span> next.setByteIndex(bi + in.readInt());<a name="line.215"></a>
<span class="sourceLineNo">216</span> _cases.add(next);<a name="line.216"></a>
<span class="sourceLineNo">217</span> }<a name="line.217"></a>
<span class="sourceLineNo">218</span> }<a name="line.218"></a>
<span class="sourceLineNo">219</span><a name="line.219"></a>
<span class="sourceLineNo">220</span> void write(DataOutput out) throws IOException {<a name="line.220"></a>
<span class="sourceLineNo">221</span> // don't call super<a name="line.221"></a>
<span class="sourceLineNo">222</span> int bi = getByteIndex();<a name="line.222"></a>
<span class="sourceLineNo">223</span> for (int byteIndex = bi + 1; (byteIndex % 4) != 0; byteIndex++)<a name="line.223"></a>
<span class="sourceLineNo">224</span> out.writeByte(0);<a name="line.224"></a>
<span class="sourceLineNo">225</span><a name="line.225"></a>
<span class="sourceLineNo">226</span> out.writeInt(getOffset());<a name="line.226"></a>
<span class="sourceLineNo">227</span> out.writeInt(getLow());<a name="line.227"></a>
<span class="sourceLineNo">228</span> out.writeInt(getHigh());<a name="line.228"></a>
<span class="sourceLineNo">229</span> for (Iterator itr = _cases.iterator(); itr.hasNext();)<a name="line.229"></a>
<span class="sourceLineNo">230</span> out.writeInt(((InstructionPtrStrategy) itr.next()).getByteIndex() <a name="line.230"></a>
<span class="sourceLineNo">231</span> - bi);<a name="line.231"></a>
<span class="sourceLineNo">232</span> }<a name="line.232"></a>
<span class="sourceLineNo">233</span>}<a name="line.233"></a>
</pre>
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