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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>/**<a name="line.6"></a>
<span class="sourceLineNo">007</span> * Contains functionality common to the different switch types<a name="line.7"></a>
<span class="sourceLineNo">008</span> * (TableSwitch and LookupSwitch).<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * @author Eric Lindauer<a name="line.10"></a>
<span class="sourceLineNo">011</span> */<a name="line.11"></a>
<span class="sourceLineNo">012</span>public abstract class SwitchInstruction extends JumpInstruction {<a name="line.12"></a>
<span class="sourceLineNo">013</span> private List _cases = new LinkedList();<a name="line.13"></a>
<span class="sourceLineNo">014</span><a name="line.14"></a>
<span class="sourceLineNo">015</span> public SwitchInstruction(Code owner, int opcode) {<a name="line.15"></a>
<span class="sourceLineNo">016</span> super(owner, opcode);<a name="line.16"></a>
<span class="sourceLineNo">017</span> }<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span> /**<a name="line.19"></a>
<span class="sourceLineNo">020</span> * Returns the current byte offsets for the different<a name="line.20"></a>
<span class="sourceLineNo">021</span> * switch cases in this Instruction.<a name="line.21"></a>
<span class="sourceLineNo">022</span> */<a name="line.22"></a>
<span class="sourceLineNo">023</span> public int[] getOffsets() {<a name="line.23"></a>
<span class="sourceLineNo">024</span> int bi = getByteIndex();<a name="line.24"></a>
<span class="sourceLineNo">025</span> int[] offsets = new int[_cases.size()];<a name="line.25"></a>
<span class="sourceLineNo">026</span> for (int i = 0; i < offsets.length; i++)<a name="line.26"></a>
<span class="sourceLineNo">027</span> offsets[i] = ((InstructionPtrStrategy) _cases.get(i)).getByteIndex()<a name="line.27"></a>
<span class="sourceLineNo">028</span> - bi;<a name="line.28"></a>
<span class="sourceLineNo">029</span> return offsets;<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> * Sets the offsets for the instructions representing the different<a name="line.33"></a>
<span class="sourceLineNo">034</span> * switch statement cases. WARNING: these offsets will not be changed<a name="line.34"></a>
<span class="sourceLineNo">035</span> * in the event that the code is modified following this call. It is<a name="line.35"></a>
<span class="sourceLineNo">036</span> * typically a good idea to follow this call with a call to updateTargets<a name="line.36"></a>
<span class="sourceLineNo">037</span> * as soon as the instructions at the given offsets are valid, at which<a name="line.37"></a>
<span class="sourceLineNo">038</span> * point the Instructions themselves will be used as the targets and the<a name="line.38"></a>
<span class="sourceLineNo">039</span> * offsets will be updated as expected.<a name="line.39"></a>
<span class="sourceLineNo">040</span> */<a name="line.40"></a>
<span class="sourceLineNo">041</span> public void setOffsets(int[] offsets) {<a name="line.41"></a>
<span class="sourceLineNo">042</span> int bi = getByteIndex();<a name="line.42"></a>
<span class="sourceLineNo">043</span> _cases.clear();<a name="line.43"></a>
<span class="sourceLineNo">044</span> for (int i = 0; i < offsets.length; i++) {<a name="line.44"></a>
<span class="sourceLineNo">045</span> InstructionPtrStrategy next = new InstructionPtrStrategy(this);<a name="line.45"></a>
<span class="sourceLineNo">046</span> next.setByteIndex(offsets[i] + bi);<a name="line.46"></a>
<span class="sourceLineNo">047</span> _cases.add(next);<a name="line.47"></a>
<span class="sourceLineNo">048</span> }<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> public int countTargets() {<a name="line.51"></a>
<span class="sourceLineNo">052</span> return _cases.size();<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> int getLength() {<a name="line.55"></a>
<span class="sourceLineNo">056</span> // don't call super.getLength(), cause JumpInstruction will return<a name="line.56"></a>
<span class="sourceLineNo">057</span> // value assuming this is an 'if' or 'goto' instruction<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> return length;<a name="line.64"></a>
<span class="sourceLineNo">065</span> }<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> * Synonymous with {@link #getTarget}.<a name="line.68"></a>
<span class="sourceLineNo">069</span> */<a name="line.69"></a>
<span class="sourceLineNo">070</span> public Instruction getDefaultTarget() {<a name="line.70"></a>
<span class="sourceLineNo">071</span> return getTarget();<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> * Synonymous with {@link #getOffset}.<a name="line.75"></a>
<span class="sourceLineNo">076</span> */<a name="line.76"></a>
<span class="sourceLineNo">077</span> public int getDefaultOffset() {<a name="line.77"></a>
<span class="sourceLineNo">078</span> return getOffset();<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> /**<a name="line.81"></a>
<span class="sourceLineNo">082</span> * Synonymous with {@link #setOffset}.<a name="line.82"></a>
<span class="sourceLineNo">083</span> */<a name="line.83"></a>
<span class="sourceLineNo">084</span> public SwitchInstruction setDefaultOffset(int offset) {<a name="line.84"></a>
<span class="sourceLineNo">085</span> setOffset(offset);<a name="line.85"></a>
<span class="sourceLineNo">086</span> return this;<a name="line.86"></a>
<span class="sourceLineNo">087</span> }<a name="line.87"></a>
<span class="sourceLineNo">088</span><a name="line.88"></a>
<span class="sourceLineNo">089</span> /**<a name="line.89"></a>
<span class="sourceLineNo">090</span> * Synonymous with {@link #setTarget}.<a name="line.90"></a>
<span class="sourceLineNo">091</span> */<a name="line.91"></a>
<span class="sourceLineNo">092</span> public SwitchInstruction setDefaultTarget(Instruction ins) {<a name="line.92"></a>
<span class="sourceLineNo">093</span> return (SwitchInstruction) setTarget(ins);<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> * Return the targets for this switch, or empty array if not set.<a name="line.97"></a>
<span class="sourceLineNo">098</span> */<a name="line.98"></a>
<span class="sourceLineNo">099</span> public Instruction[] getTargets() {<a name="line.99"></a>
<span class="sourceLineNo">100</span> Instruction[] result = new Instruction[_cases.size()];<a name="line.100"></a>
<span class="sourceLineNo">101</span> for (int i = 0; i < _cases.size(); i++)<a name="line.101"></a>
<span class="sourceLineNo">102</span> result[i] = ((InstructionPtrStrategy) _cases.get(i)).<a name="line.102"></a>
<span class="sourceLineNo">103</span> getTargetInstruction();<a name="line.103"></a>
<span class="sourceLineNo">104</span> return result;<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> /**<a name="line.107"></a>
<span class="sourceLineNo">108</span> * Set the jump points for this switch.<a name="line.108"></a>
<span class="sourceLineNo">109</span> *<a name="line.109"></a>
<span class="sourceLineNo">110</span> * @return this instruction, for method chaining<a name="line.110"></a>
<span class="sourceLineNo">111</span> */<a name="line.111"></a>
<span class="sourceLineNo">112</span> public SwitchInstruction setTargets(Instruction[] targets) {<a name="line.112"></a>
<span class="sourceLineNo">113</span> _cases.clear();<a name="line.113"></a>
<span class="sourceLineNo">114</span> if (targets != null)<a name="line.114"></a>
<span class="sourceLineNo">115</span> for (int i = 0; i < targets.length; i++)<a name="line.115"></a>
<span class="sourceLineNo">116</span> addTarget(targets[i]);<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> * Add a target to this switch.<a name="line.121"></a>
<span class="sourceLineNo">122</span> *<a name="line.122"></a>
<span class="sourceLineNo">123</span> * @return this instruction, for method chaining<a name="line.123"></a>
<span class="sourceLineNo">124</span> */<a name="line.124"></a>
<span class="sourceLineNo">125</span> public SwitchInstruction addTarget(Instruction target) {<a name="line.125"></a>
<span class="sourceLineNo">126</span> _cases.add(new InstructionPtrStrategy(this, target));<a name="line.126"></a>
<span class="sourceLineNo">127</span> return this;<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> public int getStackChange() {<a name="line.130"></a>
<span class="sourceLineNo">131</span> return -1;<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> public void updateTargets() {<a name="line.134"></a>
<span class="sourceLineNo">135</span> super.updateTargets();<a name="line.135"></a>
<span class="sourceLineNo">136</span> for (Iterator itr = _cases.iterator(); itr.hasNext();)<a name="line.136"></a>
<span class="sourceLineNo">137</span> ((InstructionPtrStrategy) itr.next()).updateTargets();<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> public void replaceTarget(Instruction oldTarget, Instruction newTarget) {<a name="line.140"></a>
<span class="sourceLineNo">141</span> super.replaceTarget(oldTarget, newTarget);<a name="line.141"></a>
<span class="sourceLineNo">142</span> for (Iterator itr = _cases.iterator(); itr.hasNext();)<a name="line.142"></a>
<span class="sourceLineNo">143</span> ((InstructionPtrStrategy) itr.next()).replaceTarget(oldTarget,<a name="line.143"></a>
<span class="sourceLineNo">144</span> newTarget);<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> void read(Instruction orig) {<a name="line.147"></a>
<span class="sourceLineNo">148</span> super.read(orig);<a name="line.148"></a>
<span class="sourceLineNo">149</span><a name="line.149"></a>
<span class="sourceLineNo">150</span> SwitchInstruction ins = (SwitchInstruction) orig;<a name="line.150"></a>
<span class="sourceLineNo">151</span> _cases.clear();<a name="line.151"></a>
<span class="sourceLineNo">152</span> InstructionPtrStrategy incoming;<a name="line.152"></a>
<span class="sourceLineNo">153</span> for (Iterator itr = ins._cases.iterator(); itr.hasNext();) {<a name="line.153"></a>
<span class="sourceLineNo">154</span> incoming = (InstructionPtrStrategy) itr.next();<a name="line.154"></a>
<span class="sourceLineNo">155</span> InstructionPtrStrategy next = new InstructionPtrStrategy(this);<a name="line.155"></a>
<span class="sourceLineNo">156</span> next.setByteIndex(incoming.getByteIndex());<a name="line.156"></a>
<span class="sourceLineNo">157</span> _cases.add(next);<a name="line.157"></a>
<span class="sourceLineNo">158</span> }<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> void clearTargets() {<a name="line.161"></a>
<span class="sourceLineNo">162</span> _cases.clear();<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 readTarget(DataInput in) throws IOException {<a name="line.165"></a>
<span class="sourceLineNo">166</span> InstructionPtrStrategy next = new InstructionPtrStrategy(this);<a name="line.166"></a>
<span class="sourceLineNo">167</span> next.setByteIndex(getByteIndex() + in.readInt());<a name="line.167"></a>
<span class="sourceLineNo">168</span> _cases.add(next);<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> /**<a name="line.171"></a>
<span class="sourceLineNo">172</span> * Set the match-jumppt pairs for this switch.<a name="line.172"></a>
<span class="sourceLineNo">173</span> *<a name="line.173"></a>
<span class="sourceLineNo">174</span> * @return this instruction, for method chaining<a name="line.174"></a>
<span class="sourceLineNo">175</span> */<a name="line.175"></a>
<span class="sourceLineNo">176</span> public SwitchInstruction setCases(int[] matches, Instruction[] targets) {<a name="line.176"></a>
<span class="sourceLineNo">177</span> setMatches(matches);<a name="line.177"></a>
<span class="sourceLineNo">178</span> setTargets(targets);<a name="line.178"></a>
<span class="sourceLineNo">179</span> return this;<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 SwitchInstruction setMatches(int[] matches) {<a name="line.182"></a>
<span class="sourceLineNo">183</span> clearMatches();<a name="line.183"></a>
<span class="sourceLineNo">184</span> for (int i = 0; i < matches.length; i++)<a name="line.184"></a>
<span class="sourceLineNo">185</span> addMatch(matches[i]);<a name="line.185"></a>
<span class="sourceLineNo">186</span> return this;<a name="line.186"></a>
<span class="sourceLineNo">187</span> }<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>
<span class="sourceLineNo">190</span> * Add a case to this switch.<a name="line.190"></a>
<span class="sourceLineNo">191</span> *<a name="line.191"></a>
<span class="sourceLineNo">192</span> * @return this instruction, for method chaining<a name="line.192"></a>
<span class="sourceLineNo">193</span> */<a name="line.193"></a>
<span class="sourceLineNo">194</span> public SwitchInstruction addCase(int match, Instruction target) {<a name="line.194"></a>
<span class="sourceLineNo">195</span> addMatch(match);<a name="line.195"></a>
<span class="sourceLineNo">196</span> addTarget(target);<a name="line.196"></a>
<span class="sourceLineNo">197</span> return this;<a name="line.197"></a>
<span class="sourceLineNo">198</span> }<a name="line.198"></a>
<span class="sourceLineNo">199</span><a name="line.199"></a>
<span class="sourceLineNo">200</span> public abstract SwitchInstruction addMatch(int match);<a name="line.200"></a>
<span class="sourceLineNo">201</span><a name="line.201"></a>
<span class="sourceLineNo">202</span> public abstract int[] getMatches();<a name="line.202"></a>
<span class="sourceLineNo">203</span><a name="line.203"></a>
<span class="sourceLineNo">204</span> abstract void clearMatches();<a name="line.204"></a>
<span class="sourceLineNo">205</span><a name="line.205"></a>
<span class="sourceLineNo">206</span> void calculateOpcode() {<a name="line.206"></a>
<span class="sourceLineNo">207</span> }<a name="line.207"></a>
<span class="sourceLineNo">208</span>}<a name="line.208"></a>
</pre>
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