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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.util.*;<a name="line.3"></a>
<span class="sourceLineNo">004</span><a name="line.4"></a>
<span class="sourceLineNo">005</span>import serp.bytecode.visitor.*;<a name="line.5"></a>
<span class="sourceLineNo">006</span><a name="line.6"></a>
<span class="sourceLineNo">007</span>/**<a name="line.7"></a>
<span class="sourceLineNo">008</span> * One of the math operations defined in the {@link Constants} interface.<a name="line.8"></a>
<span class="sourceLineNo">009</span> * Changing the type or operation of the instruction will automatically<a name="line.9"></a>
<span class="sourceLineNo">010</span> * update the underlying opcode.<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 class MathInstruction extends TypedInstruction {<a name="line.14"></a>
<span class="sourceLineNo">015</span> private static final Class[][] _mappings = new Class[][] {<a name="line.15"></a>
<span class="sourceLineNo">016</span> { byte.class, int.class },<a name="line.16"></a>
<span class="sourceLineNo">017</span> { boolean.class, int.class },<a name="line.17"></a>
<span class="sourceLineNo">018</span> { char.class, int.class },<a name="line.18"></a>
<span class="sourceLineNo">019</span> { short.class, int.class },<a name="line.19"></a>
<span class="sourceLineNo">020</span> { void.class, int.class },<a name="line.20"></a>
<span class="sourceLineNo">021</span> { Object.class, int.class },<a name="line.21"></a>
<span class="sourceLineNo">022</span> };<a name="line.22"></a>
<span class="sourceLineNo">023</span> private int _op = -1;<a name="line.23"></a>
<span class="sourceLineNo">024</span> private String _type = null;<a name="line.24"></a>
<span class="sourceLineNo">025</span><a name="line.25"></a>
<span class="sourceLineNo">026</span> MathInstruction(Code owner) {<a name="line.26"></a>
<span class="sourceLineNo">027</span> super(owner);<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> MathInstruction(Code owner, int opcode) {<a name="line.30"></a>
<span class="sourceLineNo">031</span> super(owner, opcode);<a name="line.31"></a>
<span class="sourceLineNo">032</span> _op = getOperation();<a name="line.32"></a>
<span class="sourceLineNo">033</span> }<a name="line.33"></a>
<span class="sourceLineNo">034</span><a name="line.34"></a>
<span class="sourceLineNo">035</span> public int getStackChange() {<a name="line.35"></a>
<span class="sourceLineNo">036</span> int op = getOperation();<a name="line.36"></a>
<span class="sourceLineNo">037</span> if (op == Constants.MATH_NEG || getOpcode() == Constants.NOP)<a name="line.37"></a>
<span class="sourceLineNo">038</span> return 0;<a name="line.38"></a>
<span class="sourceLineNo">039</span><a name="line.39"></a>
<span class="sourceLineNo">040</span> String type = getTypeName();<a name="line.40"></a>
<span class="sourceLineNo">041</span> if (long.class.getName().equals(type) <a name="line.41"></a>
<span class="sourceLineNo">042</span> || double.class.getName().equals(type)) {<a name="line.42"></a>
<span class="sourceLineNo">043</span> switch (getOpcode()) {<a name="line.43"></a>
<span class="sourceLineNo">044</span> case (Constants.LSHL):<a name="line.44"></a>
<span class="sourceLineNo">045</span> case (Constants.LSHR):<a name="line.45"></a>
<span class="sourceLineNo">046</span> case (Constants.LUSHR):<a name="line.46"></a>
<span class="sourceLineNo">047</span> return -1;<a name="line.47"></a>
<span class="sourceLineNo">048</span> default:<a name="line.48"></a>
<span class="sourceLineNo">049</span> return -2;<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> return -1;<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> public int getLogicalStackChange() {<a name="line.55"></a>
<span class="sourceLineNo">056</span> int op = getOperation();<a name="line.56"></a>
<span class="sourceLineNo">057</span> if (op == Constants.MATH_NEG || getOpcode() == Constants.NOP)<a name="line.57"></a>
<span class="sourceLineNo">058</span> return 0;<a name="line.58"></a>
<span class="sourceLineNo">059</span> return -1;<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> public String getTypeName() {<a name="line.62"></a>
<span class="sourceLineNo">063</span> switch (getOpcode()) {<a name="line.63"></a>
<span class="sourceLineNo">064</span> case Constants.IADD:<a name="line.64"></a>
<span class="sourceLineNo">065</span> case Constants.ISUB:<a name="line.65"></a>
<span class="sourceLineNo">066</span> case Constants.IMUL:<a name="line.66"></a>
<span class="sourceLineNo">067</span> case Constants.IDIV:<a name="line.67"></a>
<span class="sourceLineNo">068</span> case Constants.IREM:<a name="line.68"></a>
<span class="sourceLineNo">069</span> case Constants.INEG:<a name="line.69"></a>
<span class="sourceLineNo">070</span> case Constants.ISHL:<a name="line.70"></a>
<span class="sourceLineNo">071</span> case Constants.ISHR:<a name="line.71"></a>
<span class="sourceLineNo">072</span> case Constants.IUSHR:<a name="line.72"></a>
<span class="sourceLineNo">073</span> case Constants.IAND:<a name="line.73"></a>
<span class="sourceLineNo">074</span> case Constants.IOR:<a name="line.74"></a>
<span class="sourceLineNo">075</span> case Constants.IXOR:<a name="line.75"></a>
<span class="sourceLineNo">076</span> return int.class.getName();<a name="line.76"></a>
<span class="sourceLineNo">077</span> case Constants.LADD:<a name="line.77"></a>
<span class="sourceLineNo">078</span> case Constants.LSUB:<a name="line.78"></a>
<span class="sourceLineNo">079</span> case Constants.LMUL:<a name="line.79"></a>
<span class="sourceLineNo">080</span> case Constants.LDIV:<a name="line.80"></a>
<span class="sourceLineNo">081</span> case Constants.LREM:<a name="line.81"></a>
<span class="sourceLineNo">082</span> case Constants.LNEG:<a name="line.82"></a>
<span class="sourceLineNo">083</span> case Constants.LSHL:<a name="line.83"></a>
<span class="sourceLineNo">084</span> case Constants.LSHR:<a name="line.84"></a>
<span class="sourceLineNo">085</span> case Constants.LUSHR:<a name="line.85"></a>
<span class="sourceLineNo">086</span> case Constants.LAND:<a name="line.86"></a>
<span class="sourceLineNo">087</span> case Constants.LOR:<a name="line.87"></a>
<span class="sourceLineNo">088</span> case Constants.LXOR:<a name="line.88"></a>
<span class="sourceLineNo">089</span> return long.class.getName();<a name="line.89"></a>
<span class="sourceLineNo">090</span> case Constants.FADD:<a name="line.90"></a>
<span class="sourceLineNo">091</span> case Constants.FSUB:<a name="line.91"></a>
<span class="sourceLineNo">092</span> case Constants.FMUL:<a name="line.92"></a>
<span class="sourceLineNo">093</span> case Constants.FDIV:<a name="line.93"></a>
<span class="sourceLineNo">094</span> case Constants.FREM:<a name="line.94"></a>
<span class="sourceLineNo">095</span> case Constants.FNEG:<a name="line.95"></a>
<span class="sourceLineNo">096</span> return float.class.getName();<a name="line.96"></a>
<span class="sourceLineNo">097</span> case Constants.DADD:<a name="line.97"></a>
<span class="sourceLineNo">098</span> case Constants.DSUB:<a name="line.98"></a>
<span class="sourceLineNo">099</span> case Constants.DMUL:<a name="line.99"></a>
<span class="sourceLineNo">100</span> case Constants.DDIV:<a name="line.100"></a>
<span class="sourceLineNo">101</span> case Constants.DREM:<a name="line.101"></a>
<span class="sourceLineNo">102</span> case Constants.DNEG:<a name="line.102"></a>
<span class="sourceLineNo">103</span> return double.class.getName();<a name="line.103"></a>
<span class="sourceLineNo">104</span> default:<a name="line.104"></a>
<span class="sourceLineNo">105</span> return _type;<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><a name="line.108"></a>
<span class="sourceLineNo">109</span> public TypedInstruction setType(String type) {<a name="line.109"></a>
<span class="sourceLineNo">110</span> type = mapType(type, _mappings, true);<a name="line.110"></a>
<span class="sourceLineNo">111</span><a name="line.111"></a>
<span class="sourceLineNo">112</span> // if an invalid type or op, revert to nop<a name="line.112"></a>
<span class="sourceLineNo">113</span> if (type == null || _op < 0) {<a name="line.113"></a>
<span class="sourceLineNo">114</span> _type = type;<a name="line.114"></a>
<span class="sourceLineNo">115</span> return (TypedInstruction) setOpcode(Constants.NOP);<a name="line.115"></a>
<span class="sourceLineNo">116</span> }<a name="line.116"></a>
<span class="sourceLineNo">117</span><a name="line.117"></a>
<span class="sourceLineNo">118</span> // valid opcode, unset saved type<a name="line.118"></a>
<span class="sourceLineNo">119</span> _type = null;<a name="line.119"></a>
<span class="sourceLineNo">120</span> switch (type.charAt(0)) {<a name="line.120"></a>
<span class="sourceLineNo">121</span> case 'i':<a name="line.121"></a>
<span class="sourceLineNo">122</span> return (TypedInstruction) setOpcode(_op);<a name="line.122"></a>
<span class="sourceLineNo">123</span> case 'l':<a name="line.123"></a>
<span class="sourceLineNo">124</span> return (TypedInstruction) setOpcode(_op + 1);<a name="line.124"></a>
<span class="sourceLineNo">125</span> case 'f':<a name="line.125"></a>
<span class="sourceLineNo">126</span> return (TypedInstruction) setOpcode(_op + 2);<a name="line.126"></a>
<span class="sourceLineNo">127</span> case 'd':<a name="line.127"></a>
<span class="sourceLineNo">128</span> return (TypedInstruction) setOpcode(_op + 3);<a name="line.128"></a>
<span class="sourceLineNo">129</span> default:<a name="line.129"></a>
<span class="sourceLineNo">130</span> throw new IllegalStateException();<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> /**<a name="line.134"></a>
<span class="sourceLineNo">135</span> * Set the math operation to be performed. This should be one of the<a name="line.135"></a>
<span class="sourceLineNo">136</span> * math constant defined in {@link Constants}.<a name="line.136"></a>
<span class="sourceLineNo">137</span> *<a name="line.137"></a>
<span class="sourceLineNo">138</span> * @return this instruction, for method chaining<a name="line.138"></a>
<span class="sourceLineNo">139</span> */<a name="line.139"></a>
<span class="sourceLineNo">140</span> public MathInstruction setOperation(int operation) {<a name="line.140"></a>
<span class="sourceLineNo">141</span> _op = operation;<a name="line.141"></a>
<span class="sourceLineNo">142</span><a name="line.142"></a>
<span class="sourceLineNo">143</span> // this calculates the opcode<a name="line.143"></a>
<span class="sourceLineNo">144</span> setType(getTypeName());<a name="line.144"></a>
<span class="sourceLineNo">145</span> return this;<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> * Return the operation for this math instruction; will be one of the<a name="line.149"></a>
<span class="sourceLineNo">150</span> * math constant defined in {@link Constants}, or -1 if unset.<a name="line.150"></a>
<span class="sourceLineNo">151</span> */<a name="line.151"></a>
<span class="sourceLineNo">152</span> public int getOperation() {<a name="line.152"></a>
<span class="sourceLineNo">153</span> switch (getOpcode()) {<a name="line.153"></a>
<span class="sourceLineNo">154</span> case Constants.IADD:<a name="line.154"></a>
<span class="sourceLineNo">155</span> case Constants.LADD:<a name="line.155"></a>
<span class="sourceLineNo">156</span> case Constants.FADD:<a name="line.156"></a>
<span class="sourceLineNo">157</span> case Constants.DADD:<a name="line.157"></a>
<span class="sourceLineNo">158</span> return Constants.MATH_ADD;<a name="line.158"></a>
<span class="sourceLineNo">159</span> case Constants.ISUB:<a name="line.159"></a>
<span class="sourceLineNo">160</span> case Constants.LSUB:<a name="line.160"></a>
<span class="sourceLineNo">161</span> case Constants.FSUB:<a name="line.161"></a>
<span class="sourceLineNo">162</span> case Constants.DSUB:<a name="line.162"></a>
<span class="sourceLineNo">163</span> return Constants.MATH_SUB;<a name="line.163"></a>
<span class="sourceLineNo">164</span> case Constants.IMUL:<a name="line.164"></a>
<span class="sourceLineNo">165</span> case Constants.LMUL:<a name="line.165"></a>
<span class="sourceLineNo">166</span> case Constants.FMUL:<a name="line.166"></a>
<span class="sourceLineNo">167</span> case Constants.DMUL:<a name="line.167"></a>
<span class="sourceLineNo">168</span> return Constants.MATH_MUL;<a name="line.168"></a>
<span class="sourceLineNo">169</span> case Constants.IDIV:<a name="line.169"></a>
<span class="sourceLineNo">170</span> case Constants.LDIV:<a name="line.170"></a>
<span class="sourceLineNo">171</span> case Constants.FDIV:<a name="line.171"></a>
<span class="sourceLineNo">172</span> case Constants.DDIV:<a name="line.172"></a>
<span class="sourceLineNo">173</span> return Constants.MATH_DIV;<a name="line.173"></a>
<span class="sourceLineNo">174</span> case Constants.IREM:<a name="line.174"></a>
<span class="sourceLineNo">175</span> case Constants.LREM:<a name="line.175"></a>
<span class="sourceLineNo">176</span> case Constants.FREM:<a name="line.176"></a>
<span class="sourceLineNo">177</span> case Constants.DREM:<a name="line.177"></a>
<span class="sourceLineNo">178</span> return Constants.MATH_REM;<a name="line.178"></a>
<span class="sourceLineNo">179</span> case Constants.INEG:<a name="line.179"></a>
<span class="sourceLineNo">180</span> case Constants.LNEG:<a name="line.180"></a>
<span class="sourceLineNo">181</span> case Constants.FNEG:<a name="line.181"></a>
<span class="sourceLineNo">182</span> case Constants.DNEG:<a name="line.182"></a>
<span class="sourceLineNo">183</span> return Constants.MATH_NEG;<a name="line.183"></a>
<span class="sourceLineNo">184</span> case Constants.ISHL:<a name="line.184"></a>
<span class="sourceLineNo">185</span> case Constants.LSHL:<a name="line.185"></a>
<span class="sourceLineNo">186</span> return Constants.MATH_SHL;<a name="line.186"></a>
<span class="sourceLineNo">187</span> case Constants.ISHR:<a name="line.187"></a>
<span class="sourceLineNo">188</span> case Constants.LSHR:<a name="line.188"></a>
<span class="sourceLineNo">189</span> return Constants.MATH_SHR;<a name="line.189"></a>
<span class="sourceLineNo">190</span> case Constants.IUSHR:<a name="line.190"></a>
<span class="sourceLineNo">191</span> case Constants.LUSHR:<a name="line.191"></a>
<span class="sourceLineNo">192</span> return Constants.MATH_USHR;<a name="line.192"></a>
<span class="sourceLineNo">193</span> case Constants.IAND:<a name="line.193"></a>
<span class="sourceLineNo">194</span> case Constants.LAND:<a name="line.194"></a>
<span class="sourceLineNo">195</span> return Constants.MATH_AND;<a name="line.195"></a>
<span class="sourceLineNo">196</span> case Constants.IOR:<a name="line.196"></a>
<span class="sourceLineNo">197</span> case Constants.LOR:<a name="line.197"></a>
<span class="sourceLineNo">198</span> return Constants.MATH_OR;<a name="line.198"></a>
<span class="sourceLineNo">199</span> case Constants.IXOR:<a name="line.199"></a>
<span class="sourceLineNo">200</span> case Constants.LXOR:<a name="line.200"></a>
<span class="sourceLineNo">201</span> return Constants.MATH_XOR;<a name="line.201"></a>
<span class="sourceLineNo">202</span> default:<a name="line.202"></a>
<span class="sourceLineNo">203</span> return _op;<a name="line.203"></a>
<span class="sourceLineNo">204</span> }<a name="line.204"></a>
<span class="sourceLineNo">205</span> }<a name="line.205"></a>
<span class="sourceLineNo">206</span><a name="line.206"></a>
<span class="sourceLineNo">207</span> /**<a name="line.207"></a>
<span class="sourceLineNo">208</span> * MathInstructions are equal if they have the same operation and type,<a name="line.208"></a>
<span class="sourceLineNo">209</span> * or the operation and type of either is unset.<a name="line.209"></a>
<span class="sourceLineNo">210</span> */<a name="line.210"></a>
<span class="sourceLineNo">211</span> public boolean equalsInstruction(Instruction other) {<a name="line.211"></a>
<span class="sourceLineNo">212</span> if (this == other)<a name="line.212"></a>
<span class="sourceLineNo">213</span> return true;<a name="line.213"></a>
<span class="sourceLineNo">214</span> if (!(other instanceof MathInstruction))<a name="line.214"></a>
<span class="sourceLineNo">215</span> return false;<a name="line.215"></a>
<span class="sourceLineNo">216</span><a name="line.216"></a>
<span class="sourceLineNo">217</span> MathInstruction ins = (MathInstruction) other;<a name="line.217"></a>
<span class="sourceLineNo">218</span> int op = getOperation();<a name="line.218"></a>
<span class="sourceLineNo">219</span> int otherOp = ins.getOperation();<a name="line.219"></a>
<span class="sourceLineNo">220</span> boolean opEq = op == -1 || otherOp == -1 || op == otherOp;<a name="line.220"></a>
<span class="sourceLineNo">221</span><a name="line.221"></a>
<span class="sourceLineNo">222</span> String type = getTypeName();<a name="line.222"></a>
<span class="sourceLineNo">223</span> String otherType = ins.getTypeName();<a name="line.223"></a>
<span class="sourceLineNo">224</span> boolean typeEq = type == null || otherType == null <a name="line.224"></a>
<span class="sourceLineNo">225</span> || type.equals(otherType);<a name="line.225"></a>
<span class="sourceLineNo">226</span> return opEq && typeEq;<a name="line.226"></a>
<span class="sourceLineNo">227</span> }<a name="line.227"></a>
<span class="sourceLineNo">228</span><a name="line.228"></a>
<span class="sourceLineNo">229</span> public void acceptVisit(BCVisitor visit) {<a name="line.229"></a>
<span class="sourceLineNo">230</span> visit.enterMathInstruction(this);<a name="line.230"></a>
<span class="sourceLineNo">231</span> visit.exitMathInstruction(this);<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>
<span class="sourceLineNo">234</span> void read(Instruction orig) {<a name="line.234"></a>
<span class="sourceLineNo">235</span> super.read(orig);<a name="line.235"></a>
<span class="sourceLineNo">236</span> MathInstruction ins = (MathInstruction) orig;<a name="line.236"></a>
<span class="sourceLineNo">237</span> _type = ins._type;<a name="line.237"></a>
<span class="sourceLineNo">238</span> _op = ins._op;<a name="line.238"></a>
<span class="sourceLineNo">239</span> }<a name="line.239"></a>
<span class="sourceLineNo">240</span>}<a name="line.240"></a>
</pre>
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