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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.lowlevel.*;<a name="line.3"></a>
<span class="sourceLineNo">004</span>import serp.bytecode.visitor.*;<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> * Represents an instruction that manipulates the stack of the current<a name="line.7"></a>
<span class="sourceLineNo">008</span> * frame. Using the {@link #setType} methods is a hint about the type being<a name="line.8"></a>
<span class="sourceLineNo">009</span> * manipulated that might cause this instruction to use the wide version<a name="line.9"></a>
<span class="sourceLineNo">010</span> * of the opcode it represents (if manipulating a long or double). This<a name="line.10"></a>
<span class="sourceLineNo">011</span> * saves the developer from having to decide at compile time whether to<a name="line.11"></a>
<span class="sourceLineNo">012</span> * use <code>pop</code> or <code>pop2</code>, etc.<a name="line.12"></a>
<span class="sourceLineNo">013</span> *<a name="line.13"></a>
<span class="sourceLineNo">014</span> * @author Abe White<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span>public class StackInstruction extends TypedInstruction {<a name="line.16"></a>
<span class="sourceLineNo">017</span> StackInstruction(Code owner, int opcode) {<a name="line.17"></a>
<span class="sourceLineNo">018</span> super(owner, opcode);<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> public int getStackChange() {<a name="line.21"></a>
<span class="sourceLineNo">022</span> switch (getOpcode()) {<a name="line.22"></a>
<span class="sourceLineNo">023</span> case Constants.POP:<a name="line.23"></a>
<span class="sourceLineNo">024</span> return -1;<a name="line.24"></a>
<span class="sourceLineNo">025</span> case Constants.POP2:<a name="line.25"></a>
<span class="sourceLineNo">026</span> return -2;<a name="line.26"></a>
<span class="sourceLineNo">027</span> case Constants.DUP:<a name="line.27"></a>
<span class="sourceLineNo">028</span> case Constants.DUPX1:<a name="line.28"></a>
<span class="sourceLineNo">029</span> case Constants.DUPX2:<a name="line.29"></a>
<span class="sourceLineNo">030</span> return 1;<a name="line.30"></a>
<span class="sourceLineNo">031</span> case Constants.DUP2:<a name="line.31"></a>
<span class="sourceLineNo">032</span> case Constants.DUP2X1:<a name="line.32"></a>
<span class="sourceLineNo">033</span> case Constants.DUP2X2:<a name="line.33"></a>
<span class="sourceLineNo">034</span> return 2;<a name="line.34"></a>
<span class="sourceLineNo">035</span> default:<a name="line.35"></a>
<span class="sourceLineNo">036</span> return 0;<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><a name="line.39"></a>
<span class="sourceLineNo">040</span> /**<a name="line.40"></a>
<span class="sourceLineNo">041</span> * This method will always return null; use {@link #isWide} to determine<a name="line.41"></a>
<span class="sourceLineNo">042</span> * if this is pop2, dup2, etc.<a name="line.42"></a>
<span class="sourceLineNo">043</span> */<a name="line.43"></a>
<span class="sourceLineNo">044</span> public String getTypeName() {<a name="line.44"></a>
<span class="sourceLineNo">045</span> return null;<a name="line.45"></a>
<span class="sourceLineNo">046</span> }<a name="line.46"></a>
<span class="sourceLineNo">047</span><a name="line.47"></a>
<span class="sourceLineNo">048</span> public TypedInstruction setType(String type) {<a name="line.48"></a>
<span class="sourceLineNo">049</span> type = getProject().getNameCache().getExternalForm(type, false);<a name="line.49"></a>
<span class="sourceLineNo">050</span> return setWide(long.class.getName().equals(type) <a name="line.50"></a>
<span class="sourceLineNo">051</span> || double.class.getName().equals(type));<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> /**<a name="line.54"></a>
<span class="sourceLineNo">055</span> * Return whether to use the wide form of the current opcode for<a name="line.55"></a>
<span class="sourceLineNo">056</span> * operations on longs or doubles.<a name="line.56"></a>
<span class="sourceLineNo">057</span> */<a name="line.57"></a>
<span class="sourceLineNo">058</span> public boolean isWide() {<a name="line.58"></a>
<span class="sourceLineNo">059</span> switch (getOpcode()) {<a name="line.59"></a>
<span class="sourceLineNo">060</span> case Constants.POP2:<a name="line.60"></a>
<span class="sourceLineNo">061</span> case Constants.DUP2:<a name="line.61"></a>
<span class="sourceLineNo">062</span> case Constants.DUP2X1:<a name="line.62"></a>
<span class="sourceLineNo">063</span> case Constants.DUP2X2:<a name="line.63"></a>
<span class="sourceLineNo">064</span> return true;<a name="line.64"></a>
<span class="sourceLineNo">065</span> default:<a name="line.65"></a>
<span class="sourceLineNo">066</span> return false;<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><a name="line.69"></a>
<span class="sourceLineNo">070</span> /**<a name="line.70"></a>
<span class="sourceLineNo">071</span> * Set whether to use the wide form of the current opcode for operations<a name="line.71"></a>
<span class="sourceLineNo">072</span> * on longs or doubles.<a name="line.72"></a>
<span class="sourceLineNo">073</span> *<a name="line.73"></a>
<span class="sourceLineNo">074</span> * @return this instruction, for method chaining<a name="line.74"></a>
<span class="sourceLineNo">075</span> */<a name="line.75"></a>
<span class="sourceLineNo">076</span> public StackInstruction setWide(boolean wide) {<a name="line.76"></a>
<span class="sourceLineNo">077</span> switch (getOpcode()) {<a name="line.77"></a>
<span class="sourceLineNo">078</span> case Constants.POP:<a name="line.78"></a>
<span class="sourceLineNo">079</span> if (wide)<a name="line.79"></a>
<span class="sourceLineNo">080</span> setOpcode(Constants.POP2);<a name="line.80"></a>
<span class="sourceLineNo">081</span> break;<a name="line.81"></a>
<span class="sourceLineNo">082</span> case Constants.POP2:<a name="line.82"></a>
<span class="sourceLineNo">083</span> if (!wide)<a name="line.83"></a>
<span class="sourceLineNo">084</span> setOpcode(Constants.POP);<a name="line.84"></a>
<span class="sourceLineNo">085</span> break;<a name="line.85"></a>
<span class="sourceLineNo">086</span> case Constants.DUP:<a name="line.86"></a>
<span class="sourceLineNo">087</span> if (wide)<a name="line.87"></a>
<span class="sourceLineNo">088</span> setOpcode(Constants.DUP2);<a name="line.88"></a>
<span class="sourceLineNo">089</span> break;<a name="line.89"></a>
<span class="sourceLineNo">090</span> case Constants.DUP2:<a name="line.90"></a>
<span class="sourceLineNo">091</span> if (!wide)<a name="line.91"></a>
<span class="sourceLineNo">092</span> setOpcode(Constants.DUP);<a name="line.92"></a>
<span class="sourceLineNo">093</span> break;<a name="line.93"></a>
<span class="sourceLineNo">094</span> case Constants.DUPX1:<a name="line.94"></a>
<span class="sourceLineNo">095</span> if (wide)<a name="line.95"></a>
<span class="sourceLineNo">096</span> setOpcode(Constants.DUP2X1);<a name="line.96"></a>
<span class="sourceLineNo">097</span> break;<a name="line.97"></a>
<span class="sourceLineNo">098</span> case Constants.DUP2X1:<a name="line.98"></a>
<span class="sourceLineNo">099</span> if (!wide)<a name="line.99"></a>
<span class="sourceLineNo">100</span> setOpcode(Constants.DUPX1);<a name="line.100"></a>
<span class="sourceLineNo">101</span> break;<a name="line.101"></a>
<span class="sourceLineNo">102</span> case Constants.DUPX2:<a name="line.102"></a>
<span class="sourceLineNo">103</span> if (wide)<a name="line.103"></a>
<span class="sourceLineNo">104</span> setOpcode(Constants.DUP2X2);<a name="line.104"></a>
<span class="sourceLineNo">105</span> break;<a name="line.105"></a>
<span class="sourceLineNo">106</span> case Constants.DUP2X2:<a name="line.106"></a>
<span class="sourceLineNo">107</span> if (!wide)<a name="line.107"></a>
<span class="sourceLineNo">108</span> setOpcode(Constants.DUPX2);<a name="line.108"></a>
<span class="sourceLineNo">109</span> break;<a name="line.109"></a>
<span class="sourceLineNo">110</span> }<a name="line.110"></a>
<span class="sourceLineNo">111</span> return this;<a name="line.111"></a>
<span class="sourceLineNo">112</span> }<a name="line.112"></a>
<span class="sourceLineNo">113</span><a name="line.113"></a>
<span class="sourceLineNo">114</span> public void acceptVisit(BCVisitor visit) {<a name="line.114"></a>
<span class="sourceLineNo">115</span> visit.enterStackInstruction(this);<a name="line.115"></a>
<span class="sourceLineNo">116</span> visit.exitStackInstruction(this);<a name="line.116"></a>
<span class="sourceLineNo">117</span> }<a name="line.117"></a>
<span class="sourceLineNo">118</span>}<a name="line.118"></a>
</pre>
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