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<pre><span class="sourceLineNo">001</span>package serp.bytecode.lowlevel;<a name="line.1"></a>
<span class="sourceLineNo">002</span><a name="line.2"></a>
<span class="sourceLineNo">003</span>import java.io.DataInput;<a name="line.3"></a>
<span class="sourceLineNo">004</span>import java.io.DataOutput;<a name="line.4"></a>
<span class="sourceLineNo">005</span>import java.io.IOException;<a name="line.5"></a>
<span class="sourceLineNo">006</span><a name="line.6"></a>
<span class="sourceLineNo">007</span>import serp.bytecode.visitor.VisitAcceptor;<a name="line.7"></a>
<span class="sourceLineNo">008</span><a name="line.8"></a>
<span class="sourceLineNo">009</span>/**<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Base type for all constant pool entries. Entries should generally be<a name="line.10"></a>
<span class="sourceLineNo">011</span> * considered immutable; modifying an entry directly can have dire<a name="line.11"></a>
<span class="sourceLineNo">012</span> * consequences, and often renders the resulting class file invalid.<a name="line.12"></a>
<span class="sourceLineNo">013</span> *<a name="line.13"></a>
<span class="sourceLineNo">014</span> * <p>Entries cannot be shared among constant pools.</p><a name="line.14"></a>
<span class="sourceLineNo">015</span> *<a name="line.15"></a>
<span class="sourceLineNo">016</span> * @author Abe White<a name="line.16"></a>
<span class="sourceLineNo">017</span> */<a name="line.17"></a>
<span class="sourceLineNo">018</span>public abstract class Entry implements VisitAcceptor {<a name="line.18"></a>
<span class="sourceLineNo">019</span> public static final int UTF8 = 1;<a name="line.19"></a>
<span class="sourceLineNo">020</span> public static final int INT = 3;<a name="line.20"></a>
<span class="sourceLineNo">021</span> public static final int FLOAT = 4;<a name="line.21"></a>
<span class="sourceLineNo">022</span> public static final int LONG = 5;<a name="line.22"></a>
<span class="sourceLineNo">023</span> public static final int DOUBLE = 6;<a name="line.23"></a>
<span class="sourceLineNo">024</span> public static final int CLASS = 7;<a name="line.24"></a>
<span class="sourceLineNo">025</span> public static final int STRING = 8;<a name="line.25"></a>
<span class="sourceLineNo">026</span> public static final int FIELD = 9;<a name="line.26"></a>
<span class="sourceLineNo">027</span> public static final int METHOD = 10;<a name="line.27"></a>
<span class="sourceLineNo">028</span> public static final int INTERFACEMETHOD = 11;<a name="line.28"></a>
<span class="sourceLineNo">029</span> public static final int NAMEANDTYPE = 12;<a name="line.29"></a>
<span class="sourceLineNo">030</span> public static final int METHODHANDLE = 15;<a name="line.30"></a>
<span class="sourceLineNo">031</span> public static final int METHODTYPE = 16;<a name="line.31"></a>
<span class="sourceLineNo">032</span> public static final int INVOKEDYNAMIC = 18;<a name="line.32"></a>
<span class="sourceLineNo">033</span> <a name="line.33"></a>
<span class="sourceLineNo">034</span> private ConstantPool _pool = null;<a name="line.34"></a>
<span class="sourceLineNo">035</span> private int _index = 0;<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> * Read a single entry from the given bytecode stream and returns it.<a name="line.38"></a>
<span class="sourceLineNo">039</span> */<a name="line.39"></a>
<span class="sourceLineNo">040</span> public static Entry read(DataInput in) throws IOException {<a name="line.40"></a>
<span class="sourceLineNo">041</span> Entry entry = create(in.readUnsignedByte());<a name="line.41"></a>
<span class="sourceLineNo">042</span> entry.readData(in);<a name="line.42"></a>
<span class="sourceLineNo">043</span> return entry;<a name="line.43"></a>
<span class="sourceLineNo">044</span> }<a name="line.44"></a>
<span class="sourceLineNo">045</span><a name="line.45"></a>
<span class="sourceLineNo">046</span> /**<a name="line.46"></a>
<span class="sourceLineNo">047</span> * Write the given entry to the given bytecode stream.<a name="line.47"></a>
<span class="sourceLineNo">048</span> */<a name="line.48"></a>
<span class="sourceLineNo">049</span> public static void write(Entry entry, DataOutput out)<a name="line.49"></a>
<span class="sourceLineNo">050</span> throws IOException {<a name="line.50"></a>
<span class="sourceLineNo">051</span> out.writeByte(entry.getType());<a name="line.51"></a>
<span class="sourceLineNo">052</span> entry.writeData(out);<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> /**<a name="line.55"></a>
<span class="sourceLineNo">056</span> * Create an entry based on its type code.<a name="line.56"></a>
<span class="sourceLineNo">057</span> */<a name="line.57"></a>
<span class="sourceLineNo">058</span> public static Entry create(int type) {<a name="line.58"></a>
<span class="sourceLineNo">059</span> switch (type) {<a name="line.59"></a>
<span class="sourceLineNo">060</span> case CLASS:<a name="line.60"></a>
<span class="sourceLineNo">061</span> return new ClassEntry();<a name="line.61"></a>
<span class="sourceLineNo">062</span> case FIELD:<a name="line.62"></a>
<span class="sourceLineNo">063</span> return new FieldEntry();<a name="line.63"></a>
<span class="sourceLineNo">064</span> case METHOD:<a name="line.64"></a>
<span class="sourceLineNo">065</span> return new MethodEntry();<a name="line.65"></a>
<span class="sourceLineNo">066</span> case INTERFACEMETHOD:<a name="line.66"></a>
<span class="sourceLineNo">067</span> return new InterfaceMethodEntry();<a name="line.67"></a>
<span class="sourceLineNo">068</span> case STRING:<a name="line.68"></a>
<span class="sourceLineNo">069</span> return new StringEntry();<a name="line.69"></a>
<span class="sourceLineNo">070</span> case INT:<a name="line.70"></a>
<span class="sourceLineNo">071</span> return new IntEntry();<a name="line.71"></a>
<span class="sourceLineNo">072</span> case FLOAT:<a name="line.72"></a>
<span class="sourceLineNo">073</span> return new FloatEntry();<a name="line.73"></a>
<span class="sourceLineNo">074</span> case LONG:<a name="line.74"></a>
<span class="sourceLineNo">075</span> return new LongEntry();<a name="line.75"></a>
<span class="sourceLineNo">076</span> case DOUBLE:<a name="line.76"></a>
<span class="sourceLineNo">077</span> return new DoubleEntry();<a name="line.77"></a>
<span class="sourceLineNo">078</span> case NAMEANDTYPE:<a name="line.78"></a>
<span class="sourceLineNo">079</span> return new NameAndTypeEntry();<a name="line.79"></a>
<span class="sourceLineNo">080</span> case UTF8:<a name="line.80"></a>
<span class="sourceLineNo">081</span> return new UTF8Entry();<a name="line.81"></a>
<span class="sourceLineNo">082</span> case METHODHANDLE:<a name="line.82"></a>
<span class="sourceLineNo">083</span> return new MethodHandleEntry();<a name="line.83"></a>
<span class="sourceLineNo">084</span> case METHODTYPE:<a name="line.84"></a>
<span class="sourceLineNo">085</span> return new MethodTypeEntry();<a name="line.85"></a>
<span class="sourceLineNo">086</span> case INVOKEDYNAMIC:<a name="line.86"></a>
<span class="sourceLineNo">087</span> return new InvokeDynamicEntry();<a name="line.87"></a>
<span class="sourceLineNo">088</span> default:<a name="line.88"></a>
<span class="sourceLineNo">089</span> throw new IllegalArgumentException("type = " + type);<a name="line.89"></a>
<span class="sourceLineNo">090</span> }<a name="line.90"></a>
<span class="sourceLineNo">091</span> }<a name="line.91"></a>
<span class="sourceLineNo">092</span><a name="line.92"></a>
<span class="sourceLineNo">093</span> /**<a name="line.93"></a>
<span class="sourceLineNo">094</span> * Return the type code for this entry type.<a name="line.94"></a>
<span class="sourceLineNo">095</span> */<a name="line.95"></a>
<span class="sourceLineNo">096</span> public abstract int getType();<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> * Return true if this is a wide entry -- i.e. if it takes up two<a name="line.99"></a>
<span class="sourceLineNo">100</span> * places in the constant pool. Returns false by default.<a name="line.100"></a>
<span class="sourceLineNo">101</span> */<a name="line.101"></a>
<span class="sourceLineNo">102</span> public boolean isWide() {<a name="line.102"></a>
<span class="sourceLineNo">103</span> return false;<a name="line.103"></a>
<span class="sourceLineNo">104</span> }<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> * Returns the constant pool containing this entry, or null if none.<a name="line.107"></a>
<span class="sourceLineNo">108</span> */<a name="line.108"></a>
<span class="sourceLineNo">109</span> public ConstantPool getPool() {<a name="line.109"></a>
<span class="sourceLineNo">110</span> return _pool;<a name="line.110"></a>
<span class="sourceLineNo">111</span> }<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> * Returns the index of the entry in the owning constant pool, or 0.<a name="line.114"></a>
<span class="sourceLineNo">115</span> */<a name="line.115"></a>
<span class="sourceLineNo">116</span> public int getIndex() {<a name="line.116"></a>
<span class="sourceLineNo">117</span> return _index;<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> * This method is called after reading the entry type from bytecode.<a name="line.121"></a>
<span class="sourceLineNo">122</span> * It should read all the data for this entry from the given stream.<a name="line.122"></a>
<span class="sourceLineNo">123</span> */<a name="line.123"></a>
<span class="sourceLineNo">124</span> abstract void readData(DataInput in) throws IOException;<a name="line.124"></a>
<span class="sourceLineNo">125</span><a name="line.125"></a>
<span class="sourceLineNo">126</span> /**<a name="line.126"></a>
<span class="sourceLineNo">127</span> * This method is called after writing the entry type to bytecode.<a name="line.127"></a>
<span class="sourceLineNo">128</span> * It should write all data for this entry to the given stream.<a name="line.128"></a>
<span class="sourceLineNo">129</span> */<a name="line.129"></a>
<span class="sourceLineNo">130</span> abstract void writeData(DataOutput out) throws IOException;<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> * Subclasses must call this method before their state is mutated.<a name="line.133"></a>
<span class="sourceLineNo">134</span> */<a name="line.134"></a>
<span class="sourceLineNo">135</span> Object beforeModify() {<a name="line.135"></a>
<span class="sourceLineNo">136</span> if (_pool == null)<a name="line.136"></a>
<span class="sourceLineNo">137</span> return null;<a name="line.137"></a>
<span class="sourceLineNo">138</span> return _pool.getKey(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> /**<a name="line.141"></a>
<span class="sourceLineNo">142</span> * Subclasses must call this method when their state is mutated.<a name="line.142"></a>
<span class="sourceLineNo">143</span> */<a name="line.143"></a>
<span class="sourceLineNo">144</span> void afterModify(Object key) {<a name="line.144"></a>
<span class="sourceLineNo">145</span> if (_pool != null)<a name="line.145"></a>
<span class="sourceLineNo">146</span> _pool.modifyEntry(key, this);<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> /**<a name="line.149"></a>
<span class="sourceLineNo">150</span> * Sets the owning pool of the entry.<a name="line.150"></a>
<span class="sourceLineNo">151</span> */<a name="line.151"></a>
<span class="sourceLineNo">152</span> void setPool(ConstantPool pool) {<a name="line.152"></a>
<span class="sourceLineNo">153</span> // attempting to overwrite current pool?<a name="line.153"></a>
<span class="sourceLineNo">154</span> if (_pool != null && pool != null && _pool != pool)<a name="line.154"></a>
<span class="sourceLineNo">155</span> throw new IllegalStateException("Entry already belongs to a pool");<a name="line.155"></a>
<span class="sourceLineNo">156</span> _pool = pool;<a name="line.156"></a>
<span class="sourceLineNo">157</span> }<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> * Set the index of this entry within the pool.<a name="line.160"></a>
<span class="sourceLineNo">161</span> */<a name="line.161"></a>
<span class="sourceLineNo">162</span> void setIndex(int index) {<a name="line.162"></a>
<span class="sourceLineNo">163</span> _index = index;<a name="line.163"></a>
<span class="sourceLineNo">164</span> }<a name="line.164"></a>
<span class="sourceLineNo">165</span>}<a name="line.165"></a>
</pre>
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