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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.lowlevel.*;<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> * Pseudo-instruction used to place {@link Class} objects onto the stack.<a name="line.8"></a>
<span class="sourceLineNo">009</span> * This logical instruction may actually involve a large chunk of code, and<a name="line.9"></a>
<span class="sourceLineNo">010</span> * may even add static synthetic fields and methods to the owning class.<a name="line.10"></a>
<span class="sourceLineNo">011</span> * Therefore, once the type of class being loaded is set, it cannot<a name="line.11"></a>
<span class="sourceLineNo">012</span> * be changed. Also, this instruction is invalid as the target of<a name="line.12"></a>
<span class="sourceLineNo">013</span> * any jump instruction or exception handler.<a name="line.13"></a>
<span class="sourceLineNo">014</span> *<a name="line.14"></a>
<span class="sourceLineNo">015</span> * @author Abe White<a name="line.15"></a>
<span class="sourceLineNo">016</span> */<a name="line.16"></a>
<span class="sourceLineNo">017</span>public class ClassConstantInstruction {<a name="line.17"></a>
<span class="sourceLineNo">018</span> private static final Class[] _params = new Class[] { String.class };<a name="line.18"></a>
<span class="sourceLineNo">019</span> private static final Map _wrappers = new HashMap();<a name="line.19"></a>
<span class="sourceLineNo">020</span> static {<a name="line.20"></a>
<span class="sourceLineNo">021</span> _wrappers.put(byte.class.getName(), Byte.class);<a name="line.21"></a>
<span class="sourceLineNo">022</span> _wrappers.put(boolean.class.getName(), Boolean.class);<a name="line.22"></a>
<span class="sourceLineNo">023</span> _wrappers.put(char.class.getName(), Character.class);<a name="line.23"></a>
<span class="sourceLineNo">024</span> _wrappers.put(double.class.getName(), Double.class);<a name="line.24"></a>
<span class="sourceLineNo">025</span> _wrappers.put(float.class.getName(), Float.class);<a name="line.25"></a>
<span class="sourceLineNo">026</span> _wrappers.put(int.class.getName(), Integer.class);<a name="line.26"></a>
<span class="sourceLineNo">027</span> _wrappers.put(long.class.getName(), Long.class);<a name="line.27"></a>
<span class="sourceLineNo">028</span> _wrappers.put(short.class.getName(), Short.class);<a name="line.28"></a>
<span class="sourceLineNo">029</span> }<a name="line.29"></a>
<span class="sourceLineNo">030</span><a name="line.30"></a>
<span class="sourceLineNo">031</span> private Instruction _ins = null;<a name="line.31"></a>
<span class="sourceLineNo">032</span> private Code _code = null;<a name="line.32"></a>
<span class="sourceLineNo">033</span> private BCClass _class = null;<a name="line.33"></a>
<span class="sourceLineNo">034</span> private boolean _invalid = false;<a name="line.34"></a>
<span class="sourceLineNo">035</span><a name="line.35"></a>
<span class="sourceLineNo">036</span> ClassConstantInstruction(BCClass bc, Code code, Instruction nop) {<a name="line.36"></a>
<span class="sourceLineNo">037</span> _class = bc;<a name="line.37"></a>
<span class="sourceLineNo">038</span> _code = code;<a name="line.38"></a>
<span class="sourceLineNo">039</span> _ins = nop;<a name="line.39"></a>
<span class="sourceLineNo">040</span> }<a name="line.40"></a>
<span class="sourceLineNo">041</span><a name="line.41"></a>
<span class="sourceLineNo">042</span> /**<a name="line.42"></a>
<span class="sourceLineNo">043</span> * Set the type of class being loaded.<a name="line.43"></a>
<span class="sourceLineNo">044</span> *<a name="line.44"></a>
<span class="sourceLineNo">045</span> * @return the first Instruction of the block added by setting the type<a name="line.45"></a>
<span class="sourceLineNo">046</span> * @throws IllegalStateException if type has already been set<a name="line.46"></a>
<span class="sourceLineNo">047</span> */<a name="line.47"></a>
<span class="sourceLineNo">048</span> public Instruction setClass(String name) {<a name="line.48"></a>
<span class="sourceLineNo">049</span> name = _class.getProject().getNameCache().getExternalForm(name, false);<a name="line.49"></a>
<span class="sourceLineNo">050</span> setClassName(name, getWrapperClass(name));<a name="line.50"></a>
<span class="sourceLineNo">051</span> return _ins;<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> * Set the type of class being loaded.<a name="line.55"></a>
<span class="sourceLineNo">056</span> *<a name="line.56"></a>
<span class="sourceLineNo">057</span> * @return the first Instruction of the block added by setting the type<a name="line.57"></a>
<span class="sourceLineNo">058</span> * @throws IllegalStateException if type has already been set<a name="line.58"></a>
<span class="sourceLineNo">059</span> */<a name="line.59"></a>
<span class="sourceLineNo">060</span> public Instruction setClass(Class type) {<a name="line.60"></a>
<span class="sourceLineNo">061</span> return setClass(type.getName());<a name="line.61"></a>
<span class="sourceLineNo">062</span> }<a name="line.62"></a>
<span class="sourceLineNo">063</span><a name="line.63"></a>
<span class="sourceLineNo">064</span> /**<a name="line.64"></a>
<span class="sourceLineNo">065</span> * Set the type of class being loaded.<a name="line.65"></a>
<span class="sourceLineNo">066</span> *<a name="line.66"></a>
<span class="sourceLineNo">067</span> * @return the first Instruction of the block added by setting the type<a name="line.67"></a>
<span class="sourceLineNo">068</span> * @throws IllegalStateException if type has already been set<a name="line.68"></a>
<span class="sourceLineNo">069</span> */<a name="line.69"></a>
<span class="sourceLineNo">070</span> public Instruction setClass(BCClass type) {<a name="line.70"></a>
<span class="sourceLineNo">071</span> return setClass(type.getName());<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> * Set the name of the class to load.<a name="line.75"></a>
<span class="sourceLineNo">076</span> */<a name="line.76"></a>
<span class="sourceLineNo">077</span> private void setClassName(String name, Class wrapper) {<a name="line.77"></a>
<span class="sourceLineNo">078</span> if (_invalid)<a name="line.78"></a>
<span class="sourceLineNo">079</span> throw new IllegalStateException();<a name="line.79"></a>
<span class="sourceLineNo">080</span><a name="line.80"></a>
<span class="sourceLineNo">081</span> // remember the position of the code iterator<a name="line.81"></a>
<span class="sourceLineNo">082</span> Instruction before = (_code.hasNext()) ? _code.next() : null;<a name="line.82"></a>
<span class="sourceLineNo">083</span> _code.before(_ins);<a name="line.83"></a>
<span class="sourceLineNo">084</span> _code.next();<a name="line.84"></a>
<span class="sourceLineNo">085</span> if (wrapper != null)<a name="line.85"></a>
<span class="sourceLineNo">086</span> _code.getstatic().setField(wrapper, "TYPE", Class.class);<a name="line.86"></a>
<span class="sourceLineNo">087</span> else<a name="line.87"></a>
<span class="sourceLineNo">088</span> setObject(name);<a name="line.88"></a>
<span class="sourceLineNo">089</span><a name="line.89"></a>
<span class="sourceLineNo">090</span> // move to the old position<a name="line.90"></a>
<span class="sourceLineNo">091</span> if (before != null)<a name="line.91"></a>
<span class="sourceLineNo">092</span> _code.before(before);<a name="line.92"></a>
<span class="sourceLineNo">093</span> else<a name="line.93"></a>
<span class="sourceLineNo">094</span> _code.afterLast();<a name="line.94"></a>
<span class="sourceLineNo">095</span> _invalid = true;<a name="line.95"></a>
<span class="sourceLineNo">096</span> }<a name="line.96"></a>
<span class="sourceLineNo">097</span><a name="line.97"></a>
<span class="sourceLineNo">098</span> /**<a name="line.98"></a>
<span class="sourceLineNo">099</span> * Adds fields and methods as necessary to load a class constant of<a name="line.99"></a>
<span class="sourceLineNo">100</span> * an object type.<a name="line.100"></a>
<span class="sourceLineNo">101</span> */<a name="line.101"></a>
<span class="sourceLineNo">102</span> private void setObject(String name) {<a name="line.102"></a>
<span class="sourceLineNo">103</span> BCField field = addClassField(name);<a name="line.103"></a>
<span class="sourceLineNo">104</span> BCMethod method = addClassLoadMethod();<a name="line.104"></a>
<span class="sourceLineNo">105</span><a name="line.105"></a>
<span class="sourceLineNo">106</span> // copied from the way jikes loads classes<a name="line.106"></a>
<span class="sourceLineNo">107</span> _code.getstatic().setField(field);<a name="line.107"></a>
<span class="sourceLineNo">108</span> JumpInstruction ifnull = _code.ifnull();<a name="line.108"></a>
<span class="sourceLineNo">109</span> _code.getstatic().setField(field);<a name="line.109"></a>
<span class="sourceLineNo">110</span> JumpInstruction go2 = _code.go2();<a name="line.110"></a>
<span class="sourceLineNo">111</span> ifnull.setTarget(_code.constant().setValue(name));<a name="line.111"></a>
<span class="sourceLineNo">112</span> _code.invokestatic().setMethod(method);<a name="line.112"></a>
<span class="sourceLineNo">113</span> _code.dup();<a name="line.113"></a>
<span class="sourceLineNo">114</span> _code.putstatic().setField(field);<a name="line.114"></a>
<span class="sourceLineNo">115</span> go2.setTarget(_code.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> /**<a name="line.118"></a>
<span class="sourceLineNo">119</span> * Adds a static field to hold the loaded class constant.<a name="line.119"></a>
<span class="sourceLineNo">120</span> */<a name="line.120"></a>
<span class="sourceLineNo">121</span> private BCField addClassField(String name) {<a name="line.121"></a>
<span class="sourceLineNo">122</span> String fieldName = "class$L" <a name="line.122"></a>
<span class="sourceLineNo">123</span> + name.replace('.', '$').replace('[', '$').replace(';', '$');<a name="line.123"></a>
<span class="sourceLineNo">124</span> BCField field = _class.getDeclaredField(fieldName);<a name="line.124"></a>
<span class="sourceLineNo">125</span> if (field == null) {<a name="line.125"></a>
<span class="sourceLineNo">126</span> field = _class.declareField(fieldName, Class.class);<a name="line.126"></a>
<span class="sourceLineNo">127</span> field.makePackage();<a name="line.127"></a>
<span class="sourceLineNo">128</span> field.setStatic(true);<a name="line.128"></a>
<span class="sourceLineNo">129</span> field.setSynthetic(true);<a name="line.129"></a>
<span class="sourceLineNo">130</span> }<a name="line.130"></a>
<span class="sourceLineNo">131</span> return field;<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> * Adds the standard <code>class$<code> method used inernally by classes<a name="line.135"></a>
<span class="sourceLineNo">136</span> * to load class constants for object types.<a name="line.136"></a>
<span class="sourceLineNo">137</span> */<a name="line.137"></a>
<span class="sourceLineNo">138</span> private BCMethod addClassLoadMethod() {<a name="line.138"></a>
<span class="sourceLineNo">139</span> BCMethod method = _class.getDeclaredMethod("class$", _params);<a name="line.139"></a>
<span class="sourceLineNo">140</span> if (method != null)<a name="line.140"></a>
<span class="sourceLineNo">141</span> return method;<a name="line.141"></a>
<span class="sourceLineNo">142</span><a name="line.142"></a>
<span class="sourceLineNo">143</span> // add the special synthetic method<a name="line.143"></a>
<span class="sourceLineNo">144</span> method = _class.declareMethod("class$", Class.class, _params);<a name="line.144"></a>
<span class="sourceLineNo">145</span> method.setStatic(true);<a name="line.145"></a>
<span class="sourceLineNo">146</span> method.makePackage();<a name="line.146"></a>
<span class="sourceLineNo">147</span> method.setSynthetic(true);<a name="line.147"></a>
<span class="sourceLineNo">148</span><a name="line.148"></a>
<span class="sourceLineNo">149</span> // copied directly from the output of the jikes compiler<a name="line.149"></a>
<span class="sourceLineNo">150</span> Code code = method.getCode(true);<a name="line.150"></a>
<span class="sourceLineNo">151</span> code.setMaxStack(3);<a name="line.151"></a>
<span class="sourceLineNo">152</span> code.setMaxLocals(2);<a name="line.152"></a>
<span class="sourceLineNo">153</span><a name="line.153"></a>
<span class="sourceLineNo">154</span> Instruction tryStart = code.aload().setLocal(0);<a name="line.154"></a>
<span class="sourceLineNo">155</span> code.invokestatic().setMethod(Class.class, "forName", Class.class, <a name="line.155"></a>
<span class="sourceLineNo">156</span> _params);<a name="line.156"></a>
<span class="sourceLineNo">157</span> Instruction tryEnd = code.areturn();<a name="line.157"></a>
<span class="sourceLineNo">158</span> Instruction handlerStart = code.astore().setLocal(1);<a name="line.158"></a>
<span class="sourceLineNo">159</span> code.anew().setType(NoClassDefFoundError.class);<a name="line.159"></a>
<span class="sourceLineNo">160</span> code.dup();<a name="line.160"></a>
<span class="sourceLineNo">161</span> code.aload().setLocal(1);<a name="line.161"></a>
<span class="sourceLineNo">162</span> code.invokevirtual().setMethod(Throwable.class, "getMessage", <a name="line.162"></a>
<span class="sourceLineNo">163</span> String.class, null);<a name="line.163"></a>
<span class="sourceLineNo">164</span> code.invokespecial().setMethod(NoClassDefFoundError.class, "<init>", <a name="line.164"></a>
<span class="sourceLineNo">165</span> void.class, _params);<a name="line.165"></a>
<span class="sourceLineNo">166</span> code.athrow();<a name="line.166"></a>
<span class="sourceLineNo">167</span> code.addExceptionHandler(tryStart, tryEnd, handlerStart,<a name="line.167"></a>
<span class="sourceLineNo">168</span> ClassNotFoundException.class);<a name="line.168"></a>
<span class="sourceLineNo">169</span> return method;<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> /**<a name="line.172"></a>
<span class="sourceLineNo">173</span> * Return the wrapper type for the given primitive class, or null<a name="line.173"></a>
<span class="sourceLineNo">174</span> * if the given name is not a primitive type. The given name should<a name="line.174"></a>
<span class="sourceLineNo">175</span> * be in external form.<a name="line.175"></a>
<span class="sourceLineNo">176</span> */<a name="line.176"></a>
<span class="sourceLineNo">177</span> private static Class getWrapperClass(String name) {<a name="line.177"></a>
<span class="sourceLineNo">178</span> if (name == null)<a name="line.178"></a>
<span class="sourceLineNo">179</span> return null;<a name="line.179"></a>
<span class="sourceLineNo">180</span> return (Class) _wrappers.get(name);<a name="line.180"></a>
<span class="sourceLineNo">181</span> }<a name="line.181"></a>
<span class="sourceLineNo">182</span>}<a name="line.182"></a>
</pre>
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