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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.*;<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> * Efficient representation of the constant pool as a table. This class<a name="line.6"></a>
<span class="sourceLineNo">007</span> * can be used to parse out bits of information from bytecode without<a name="line.7"></a>
<span class="sourceLineNo">008</span> * instantiating a full {@link serp.bytecode.BCClass}.<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * @author Abe White<a name="line.10"></a>
<span class="sourceLineNo">011</span> */<a name="line.11"></a>
<span class="sourceLineNo">012</span>public class ConstantPoolTable {<a name="line.12"></a>
<span class="sourceLineNo">013</span> private byte[] _bytecode = null;<a name="line.13"></a>
<span class="sourceLineNo">014</span> private int[] _table = null;<a name="line.14"></a>
<span class="sourceLineNo">015</span> private int _idx = 0;<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span> /**<a name="line.17"></a>
<span class="sourceLineNo">018</span> * Constructor; supply class bytecode.<a name="line.18"></a>
<span class="sourceLineNo">019</span> */<a name="line.19"></a>
<span class="sourceLineNo">020</span> public ConstantPoolTable(byte[] b) {<a name="line.20"></a>
<span class="sourceLineNo">021</span> _bytecode = b;<a name="line.21"></a>
<span class="sourceLineNo">022</span> _table = new int[readUnsignedShort(b, 8)];<a name="line.22"></a>
<span class="sourceLineNo">023</span> _idx = parse(b, _table);<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> /**<a name="line.26"></a>
<span class="sourceLineNo">027</span> * Constructor; supply input stream to bytecode.<a name="line.27"></a>
<span class="sourceLineNo">028</span> */<a name="line.28"></a>
<span class="sourceLineNo">029</span> public ConstantPoolTable(InputStream in) throws IOException {<a name="line.29"></a>
<span class="sourceLineNo">030</span> this(toByteArray(in));<a name="line.30"></a>
<span class="sourceLineNo">031</span> }<a name="line.31"></a>
<span class="sourceLineNo">032</span><a name="line.32"></a>
<span class="sourceLineNo">033</span> /**<a name="line.33"></a>
<span class="sourceLineNo">034</span> * Allows static computation of the byte index after the constant<a name="line.34"></a>
<span class="sourceLineNo">035</span> * pool without caching constant pool information.<a name="line.35"></a>
<span class="sourceLineNo">036</span> */<a name="line.36"></a>
<span class="sourceLineNo">037</span> public static int getEndIndex(byte[] b) {<a name="line.37"></a>
<span class="sourceLineNo">038</span> return parse(b, null);<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> /**<a name="line.41"></a>
<span class="sourceLineNo">042</span> * Parse class bytecode, returning end index of pool.<a name="line.42"></a>
<span class="sourceLineNo">043</span> */<a name="line.43"></a>
<span class="sourceLineNo">044</span> private static int parse(byte[] b, int[] table) {<a name="line.44"></a>
<span class="sourceLineNo">045</span> // each entry is the index in the byte array of the data for a const<a name="line.45"></a>
<span class="sourceLineNo">046</span> // pool entry<a name="line.46"></a>
<span class="sourceLineNo">047</span> int entries = (table == null) ? readUnsignedShort(b, 8) : table.length;<a name="line.47"></a>
<span class="sourceLineNo">048</span> int idx = 10;<a name="line.48"></a>
<span class="sourceLineNo">049</span> for (int i = 1; i < entries; i++) {<a name="line.49"></a>
<span class="sourceLineNo">050</span> if (table != null)<a name="line.50"></a>
<span class="sourceLineNo">051</span> table[i] = idx + 1; // skip entry type<a name="line.51"></a>
<span class="sourceLineNo">052</span><a name="line.52"></a>
<span class="sourceLineNo">053</span> switch (b[idx]) {<a name="line.53"></a>
<span class="sourceLineNo">054</span> case 1: // utf8<a name="line.54"></a>
<span class="sourceLineNo">055</span> idx += (3 + readUnsignedShort(b, idx + 1));<a name="line.55"></a>
<span class="sourceLineNo">056</span> break;<a name="line.56"></a>
<span class="sourceLineNo">057</span> case 3: // integer<a name="line.57"></a>
<span class="sourceLineNo">058</span> case 4: // float<a name="line.58"></a>
<span class="sourceLineNo">059</span> case 9: // field<a name="line.59"></a>
<span class="sourceLineNo">060</span> case 10: // method<a name="line.60"></a>
<span class="sourceLineNo">061</span> case 11: // interface method<a name="line.61"></a>
<span class="sourceLineNo">062</span> case 18: // invoke dynamic<a name="line.62"></a>
<span class="sourceLineNo">063</span> case 12: // name<a name="line.63"></a>
<span class="sourceLineNo">064</span> idx += 5;<a name="line.64"></a>
<span class="sourceLineNo">065</span> break;<a name="line.65"></a>
<span class="sourceLineNo">066</span> case 5: // long<a name="line.66"></a>
<span class="sourceLineNo">067</span> case 6: // double<a name="line.67"></a>
<span class="sourceLineNo">068</span> idx += 9;<a name="line.68"></a>
<span class="sourceLineNo">069</span> i++; // wide entry<a name="line.69"></a>
<span class="sourceLineNo">070</span> break;<a name="line.70"></a>
<span class="sourceLineNo">071</span> case 15: // method handle<a name="line.71"></a>
<span class="sourceLineNo">072</span> idx += 4;<a name="line.72"></a>
<span class="sourceLineNo">073</span> break;<a name="line.73"></a>
<span class="sourceLineNo">074</span> case 16: // method type<a name="line.74"></a>
<span class="sourceLineNo">075</span> default:<a name="line.75"></a>
<span class="sourceLineNo">076</span> idx += 3;<a name="line.76"></a>
<span class="sourceLineNo">077</span> }<a name="line.77"></a>
<span class="sourceLineNo">078</span> }<a name="line.78"></a>
<span class="sourceLineNo">079</span> return idx;<a name="line.79"></a>
<span class="sourceLineNo">080</span> }<a name="line.80"></a>
<span class="sourceLineNo">081</span><a name="line.81"></a>
<span class="sourceLineNo">082</span> /**<a name="line.82"></a>
<span class="sourceLineNo">083</span> * Read a byte value at the given offset into the given bytecode.<a name="line.83"></a>
<span class="sourceLineNo">084</span> */<a name="line.84"></a>
<span class="sourceLineNo">085</span> public static int readByte(byte[] b, int idx) {<a name="line.85"></a>
<span class="sourceLineNo">086</span> return b[idx] & 0xFF;<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> * Read an unsigned short value at the given offset into the given bytecode.<a name="line.90"></a>
<span class="sourceLineNo">091</span> */<a name="line.91"></a>
<span class="sourceLineNo">092</span> public static int readUnsignedShort(byte[] b, int idx) {<a name="line.92"></a>
<span class="sourceLineNo">093</span> return (readByte(b, idx) << 8) | readByte(b, idx + 1);<a name="line.93"></a>
<span class="sourceLineNo">094</span> }<a name="line.94"></a>
<span class="sourceLineNo">095</span><a name="line.95"></a>
<span class="sourceLineNo">096</span> /**<a name="line.96"></a>
<span class="sourceLineNo">097</span> * Read an int value at the given offset into the given bytecode.<a name="line.97"></a>
<span class="sourceLineNo">098</span> */<a name="line.98"></a>
<span class="sourceLineNo">099</span> public static int readInt(byte[] b, int idx) {<a name="line.99"></a>
<span class="sourceLineNo">100</span> return (readByte(b, idx) << 24) | (readByte(b, idx + 1) << 16) <a name="line.100"></a>
<span class="sourceLineNo">101</span> | (readByte(b, idx + 2) << 8) | readByte(b, idx + 3);<a name="line.101"></a>
<span class="sourceLineNo">102</span> }<a name="line.102"></a>
<span class="sourceLineNo">103</span><a name="line.103"></a>
<span class="sourceLineNo">104</span> /**<a name="line.104"></a>
<span class="sourceLineNo">105</span> * Read a long value at the given offset into the given bytecode.<a name="line.105"></a>
<span class="sourceLineNo">106</span> */<a name="line.106"></a>
<span class="sourceLineNo">107</span> public static long readLong(byte[] b, int idx) {<a name="line.107"></a>
<span class="sourceLineNo">108</span> return (readInt(b, idx) << 32) | readInt(b, idx + 4);<a name="line.108"></a>
<span class="sourceLineNo">109</span> }<a name="line.109"></a>
<span class="sourceLineNo">110</span><a name="line.110"></a>
<span class="sourceLineNo">111</span> /**<a name="line.111"></a>
<span class="sourceLineNo">112</span> * Read a UTF-8 string value at the given offset into the given bytecode.<a name="line.112"></a>
<span class="sourceLineNo">113</span> */<a name="line.113"></a>
<span class="sourceLineNo">114</span> public static String readString(byte[] b, int idx) {<a name="line.114"></a>
<span class="sourceLineNo">115</span> int len = readUnsignedShort(b, idx);<a name="line.115"></a>
<span class="sourceLineNo">116</span> try {<a name="line.116"></a>
<span class="sourceLineNo">117</span> return new String(b, idx + 2, len, "UTF-8");<a name="line.117"></a>
<span class="sourceLineNo">118</span> } catch (UnsupportedEncodingException uee) {<a name="line.118"></a>
<span class="sourceLineNo">119</span> throw new ClassFormatError(uee.toString());<a name="line.119"></a>
<span class="sourceLineNo">120</span> }<a name="line.120"></a>
<span class="sourceLineNo">121</span> }<a name="line.121"></a>
<span class="sourceLineNo">122</span><a name="line.122"></a>
<span class="sourceLineNo">123</span> /**<a name="line.123"></a>
<span class="sourceLineNo">124</span> * Read the contents of the given stream.<a name="line.124"></a>
<span class="sourceLineNo">125</span> */<a name="line.125"></a>
<span class="sourceLineNo">126</span> private static byte[] toByteArray(InputStream in) throws IOException {<a name="line.126"></a>
<span class="sourceLineNo">127</span> ByteArrayOutputStream bout = new ByteArrayOutputStream();<a name="line.127"></a>
<span class="sourceLineNo">128</span> byte[] buf = new byte[1024];<a name="line.128"></a>
<span class="sourceLineNo">129</span> for (int r; (r = in.read(buf)) != -1; bout.write(buf, 0, r));<a name="line.129"></a>
<span class="sourceLineNo">130</span> return bout.toByteArray();<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> * Return the index into the bytecode of the end of the constant pool.<a name="line.134"></a>
<span class="sourceLineNo">135</span> */<a name="line.135"></a>
<span class="sourceLineNo">136</span> public int getEndIndex() {<a name="line.136"></a>
<span class="sourceLineNo">137</span> return _idx;<a name="line.137"></a>
<span class="sourceLineNo">138</span> }<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> * Return the given table entry.<a name="line.141"></a>
<span class="sourceLineNo">142</span> */<a name="line.142"></a>
<span class="sourceLineNo">143</span> public int get(int idx) {<a name="line.143"></a>
<span class="sourceLineNo">144</span> return _table[idx];<a name="line.144"></a>
<span class="sourceLineNo">145</span> }<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> * Read a byte value at the given offset.<a name="line.148"></a>
<span class="sourceLineNo">149</span> */<a name="line.149"></a>
<span class="sourceLineNo">150</span> public int readByte(int idx) {<a name="line.150"></a>
<span class="sourceLineNo">151</span> return readByte(_bytecode, idx);<a name="line.151"></a>
<span class="sourceLineNo">152</span> }<a name="line.152"></a>
<span class="sourceLineNo">153</span><a name="line.153"></a>
<span class="sourceLineNo">154</span> /**<a name="line.154"></a>
<span class="sourceLineNo">155</span> * Read an unsigned short value at the given offset.<a name="line.155"></a>
<span class="sourceLineNo">156</span> */<a name="line.156"></a>
<span class="sourceLineNo">157</span> public int readUnsignedShort(int idx) {<a name="line.157"></a>
<span class="sourceLineNo">158</span> return readUnsignedShort(_bytecode, idx);<a name="line.158"></a>
<span class="sourceLineNo">159</span> }<a name="line.159"></a>
<span class="sourceLineNo">160</span><a name="line.160"></a>
<span class="sourceLineNo">161</span> /**<a name="line.161"></a>
<span class="sourceLineNo">162</span> * Read an int value at the given offset.<a name="line.162"></a>
<span class="sourceLineNo">163</span> */<a name="line.163"></a>
<span class="sourceLineNo">164</span> public int readInt(int idx) {<a name="line.164"></a>
<span class="sourceLineNo">165</span> return readInt(_bytecode, idx);<a name="line.165"></a>
<span class="sourceLineNo">166</span> }<a name="line.166"></a>
<span class="sourceLineNo">167</span><a name="line.167"></a>
<span class="sourceLineNo">168</span> /**<a name="line.168"></a>
<span class="sourceLineNo">169</span> * Read a long value at the given offset.<a name="line.169"></a>
<span class="sourceLineNo">170</span> */<a name="line.170"></a>
<span class="sourceLineNo">171</span> public long readLong(int idx) {<a name="line.171"></a>
<span class="sourceLineNo">172</span> return readLong(_bytecode, idx);<a name="line.172"></a>
<span class="sourceLineNo">173</span> }<a name="line.173"></a>
<span class="sourceLineNo">174</span><a name="line.174"></a>
<span class="sourceLineNo">175</span> /**<a name="line.175"></a>
<span class="sourceLineNo">176</span> * Read a UTF-8 string value at the given offset.<a name="line.176"></a>
<span class="sourceLineNo">177</span> */<a name="line.177"></a>
<span class="sourceLineNo">178</span> public String readString(int idx) {<a name="line.178"></a>
<span class="sourceLineNo">179</span> return readString(_bytecode, idx);<a name="line.179"></a>
<span class="sourceLineNo">180</span> }<a name="line.180"></a>
<span class="sourceLineNo">181</span>}<a name="line.181"></a>
</pre>
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