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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 serp.bytecode.visitor.*;<a name="line.3"></a>
<span class="sourceLineNo">004</span><a name="line.4"></a>
<span class="sourceLineNo">005</span>/**<a name="line.5"></a>
<span class="sourceLineNo">006</span> * An instruction comparing two stack values. Examples include<a name="line.6"></a>
<span class="sourceLineNo">007</span> * <code>lcmp, fcmpl</code>, etc.<a name="line.7"></a>
<span class="sourceLineNo">008</span> *<a name="line.8"></a>
<span class="sourceLineNo">009</span> * @author Abe White<a name="line.9"></a>
<span class="sourceLineNo">010</span> */<a name="line.10"></a>
<span class="sourceLineNo">011</span>public class CmpInstruction extends TypedInstruction {<a name="line.11"></a>
<span class="sourceLineNo">012</span> private static Class[][] _mappings = new Class[][] {<a name="line.12"></a>
<span class="sourceLineNo">013</span> { int.class, long.class },<a name="line.13"></a>
<span class="sourceLineNo">014</span> { byte.class, long.class },<a name="line.14"></a>
<span class="sourceLineNo">015</span> { char.class, long.class },<a name="line.15"></a>
<span class="sourceLineNo">016</span> { short.class, long.class },<a name="line.16"></a>
<span class="sourceLineNo">017</span> { boolean.class, long.class },<a name="line.17"></a>
<span class="sourceLineNo">018</span> { void.class, long.class },<a name="line.18"></a>
<span class="sourceLineNo">019</span> { Object.class, long.class },<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> CmpInstruction(Code owner) {<a name="line.22"></a>
<span class="sourceLineNo">023</span> super(owner);<a name="line.23"></a>
<span class="sourceLineNo">024</span> }<a name="line.24"></a>
<span class="sourceLineNo">025</span><a name="line.25"></a>
<span class="sourceLineNo">026</span> CmpInstruction(Code owner, int opcode) {<a name="line.26"></a>
<span class="sourceLineNo">027</span> super(owner, opcode);<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> public int getLogicalStackChange() {<a name="line.30"></a>
<span class="sourceLineNo">031</span> switch (getOpcode()) {<a name="line.31"></a>
<span class="sourceLineNo">032</span> case Constants.NOP:<a name="line.32"></a>
<span class="sourceLineNo">033</span> return 0;<a name="line.33"></a>
<span class="sourceLineNo">034</span> default:<a name="line.34"></a>
<span class="sourceLineNo">035</span> return -1;<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> public int getStackChange() {<a name="line.39"></a>
<span class="sourceLineNo">040</span> switch (getOpcode()) {<a name="line.40"></a>
<span class="sourceLineNo">041</span> case Constants.LCMP:<a name="line.41"></a>
<span class="sourceLineNo">042</span> case Constants.DCMPL:<a name="line.42"></a>
<span class="sourceLineNo">043</span> case Constants.DCMPG:<a name="line.43"></a>
<span class="sourceLineNo">044</span> return -3;<a name="line.44"></a>
<span class="sourceLineNo">045</span> case Constants.NOP:<a name="line.45"></a>
<span class="sourceLineNo">046</span> return 0;<a name="line.46"></a>
<span class="sourceLineNo">047</span> default:<a name="line.47"></a>
<span class="sourceLineNo">048</span> return -1;<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> public String getTypeName() {<a name="line.52"></a>
<span class="sourceLineNo">053</span> switch (getOpcode()) {<a name="line.53"></a>
<span class="sourceLineNo">054</span> case Constants.LCMP:<a name="line.54"></a>
<span class="sourceLineNo">055</span> return long.class.getName();<a name="line.55"></a>
<span class="sourceLineNo">056</span> case Constants.FCMPL:<a name="line.56"></a>
<span class="sourceLineNo">057</span> case Constants.FCMPG:<a name="line.57"></a>
<span class="sourceLineNo">058</span> return float.class.getName();<a name="line.58"></a>
<span class="sourceLineNo">059</span> case Constants.DCMPL:<a name="line.59"></a>
<span class="sourceLineNo">060</span> case Constants.DCMPG:<a name="line.60"></a>
<span class="sourceLineNo">061</span> return double.class.getName();<a name="line.61"></a>
<span class="sourceLineNo">062</span> default:<a name="line.62"></a>
<span class="sourceLineNo">063</span> return null;<a name="line.63"></a>
<span class="sourceLineNo">064</span> }<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> public TypedInstruction setType(String type) {<a name="line.67"></a>
<span class="sourceLineNo">068</span> type = mapType(type, _mappings, true);<a name="line.68"></a>
<span class="sourceLineNo">069</span> if (type == null)<a name="line.69"></a>
<span class="sourceLineNo">070</span> return (TypedInstruction) setOpcode(Constants.NOP);<a name="line.70"></a>
<span class="sourceLineNo">071</span><a name="line.71"></a>
<span class="sourceLineNo">072</span> int opcode = getOpcode();<a name="line.72"></a>
<span class="sourceLineNo">073</span> switch (type.charAt(0)) {<a name="line.73"></a>
<span class="sourceLineNo">074</span> case 'l':<a name="line.74"></a>
<span class="sourceLineNo">075</span> return (TypedInstruction) setOpcode(Constants.LCMP);<a name="line.75"></a>
<span class="sourceLineNo">076</span> case 'f':<a name="line.76"></a>
<span class="sourceLineNo">077</span> if ((opcode == Constants.FCMPL) || (opcode == Constants.DCMPL))<a name="line.77"></a>
<span class="sourceLineNo">078</span> return (TypedInstruction) setOpcode(Constants.FCMPL);<a name="line.78"></a>
<span class="sourceLineNo">079</span> return (TypedInstruction) setOpcode(Constants.FCMPG);<a name="line.79"></a>
<span class="sourceLineNo">080</span> case 'd':<a name="line.80"></a>
<span class="sourceLineNo">081</span> if ((opcode == Constants.FCMPL) || (opcode == Constants.DCMPL))<a name="line.81"></a>
<span class="sourceLineNo">082</span> return (TypedInstruction) setOpcode(Constants.DCMPL);<a name="line.82"></a>
<span class="sourceLineNo">083</span> return (TypedInstruction) setOpcode(Constants.DCMPG);<a name="line.83"></a>
<span class="sourceLineNo">084</span> default:<a name="line.84"></a>
<span class="sourceLineNo">085</span> throw new IllegalStateException();<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><a name="line.88"></a>
<span class="sourceLineNo">089</span> /**<a name="line.89"></a>
<span class="sourceLineNo">090</span> * Return the number that will be placed on the stack if this instruction<a name="line.90"></a>
<span class="sourceLineNo">091</span> * is of type float or double and one of the operands is NaN. For<a name="line.91"></a>
<span class="sourceLineNo">092</span> * FCMPG or DCMPG, this value will be 1; for FCMPL or DCMPL this value<a name="line.92"></a>
<span class="sourceLineNo">093</span> * will be -1. For LCMP or if the type is unset, this value will be 0.<a name="line.93"></a>
<span class="sourceLineNo">094</span> */<a name="line.94"></a>
<span class="sourceLineNo">095</span> public int getNaNValue() {<a name="line.95"></a>
<span class="sourceLineNo">096</span> switch (getOpcode()) {<a name="line.96"></a>
<span class="sourceLineNo">097</span> case Constants.FCMPL:<a name="line.97"></a>
<span class="sourceLineNo">098</span> case Constants.DCMPL:<a name="line.98"></a>
<span class="sourceLineNo">099</span> return -1;<a name="line.99"></a>
<span class="sourceLineNo">100</span> case Constants.FCMPG:<a name="line.100"></a>
<span class="sourceLineNo">101</span> case Constants.DCMPG:<a name="line.101"></a>
<span class="sourceLineNo">102</span> return 1;<a name="line.102"></a>
<span class="sourceLineNo">103</span> default:<a name="line.103"></a>
<span class="sourceLineNo">104</span> return 0;<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> /**<a name="line.108"></a>
<span class="sourceLineNo">109</span> * Set the number that will be placed on the stack if this instruction<a name="line.109"></a>
<span class="sourceLineNo">110</span> * is of type float or double and one of the operands is NaN. For<a name="line.110"></a>
<span class="sourceLineNo">111</span> * FCMPG or DCMPG, this value should be 1; for FCMPL or DCMPL this value<a name="line.111"></a>
<span class="sourceLineNo">112</span> * should be -1. For LCMP, this value should be 0.<a name="line.112"></a>
<span class="sourceLineNo">113</span> *<a name="line.113"></a>
<span class="sourceLineNo">114</span> * @return this instruction, for method chaining<a name="line.114"></a>
<span class="sourceLineNo">115</span> */<a name="line.115"></a>
<span class="sourceLineNo">116</span> public CmpInstruction setNaNValue(int nan) {<a name="line.116"></a>
<span class="sourceLineNo">117</span> switch (getOpcode()) {<a name="line.117"></a>
<span class="sourceLineNo">118</span> case Constants.FCMPL:<a name="line.118"></a>
<span class="sourceLineNo">119</span> case Constants.FCMPG:<a name="line.119"></a>
<span class="sourceLineNo">120</span> if (nan == 1)<a name="line.120"></a>
<span class="sourceLineNo">121</span> setOpcode(Constants.FCMPG);<a name="line.121"></a>
<span class="sourceLineNo">122</span> else if (nan == -1)<a name="line.122"></a>
<span class="sourceLineNo">123</span> setOpcode(Constants.FCMPL);<a name="line.123"></a>
<span class="sourceLineNo">124</span> else<a name="line.124"></a>
<span class="sourceLineNo">125</span> throw new IllegalArgumentException("Invalid nan for type");<a name="line.125"></a>
<span class="sourceLineNo">126</span> case Constants.DCMPL:<a name="line.126"></a>
<span class="sourceLineNo">127</span> case Constants.DCMPG:<a name="line.127"></a>
<span class="sourceLineNo">128</span> if (nan == 1)<a name="line.128"></a>
<span class="sourceLineNo">129</span> setOpcode(Constants.DCMPG);<a name="line.129"></a>
<span class="sourceLineNo">130</span> else if (nan == -1)<a name="line.130"></a>
<span class="sourceLineNo">131</span> setOpcode(Constants.DCMPL);<a name="line.131"></a>
<span class="sourceLineNo">132</span> else<a name="line.132"></a>
<span class="sourceLineNo">133</span> throw new IllegalArgumentException("Invalid nan for type");<a name="line.133"></a>
<span class="sourceLineNo">134</span> default:<a name="line.134"></a>
<span class="sourceLineNo">135</span> if (nan != 0)<a name="line.135"></a>
<span class="sourceLineNo">136</span> throw new IllegalArgumentException("Invalid nan for type");<a name="line.136"></a>
<span class="sourceLineNo">137</span> }<a name="line.137"></a>
<span class="sourceLineNo">138</span> return this;<a name="line.138"></a>
<span class="sourceLineNo">139</span> }<a name="line.139"></a>
<span class="sourceLineNo">140</span><a name="line.140"></a>
<span class="sourceLineNo">141</span> public void acceptVisit(BCVisitor visit) {<a name="line.141"></a>
<span class="sourceLineNo">142</span> visit.enterCmpInstruction(this);<a name="line.142"></a>
<span class="sourceLineNo">143</span> visit.exitCmpInstruction(this);<a name="line.143"></a>
<span class="sourceLineNo">144</span> }<a name="line.144"></a>
<span class="sourceLineNo">145</span>}<a name="line.145"></a>
</pre>
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