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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.io.*;<a name="line.3"></a>
<span class="sourceLineNo">004</span>import java.util.*;<a name="line.4"></a>
<span class="sourceLineNo">005</span><a name="line.5"></a>
<span class="sourceLineNo">006</span>import serp.bytecode.lowlevel.*;<a name="line.6"></a>
<span class="sourceLineNo">007</span>import serp.bytecode.visitor.*;<a name="line.7"></a>
<span class="sourceLineNo">008</span>import serp.util.*;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>/**<a name="line.10"></a>
<span class="sourceLineNo">011</span> * A local variable or local variable type.<a name="line.11"></a>
<span class="sourceLineNo">012</span> *<a name="line.12"></a>
<span class="sourceLineNo">013</span> * @author Abe White<a name="line.13"></a>
<span class="sourceLineNo">014</span> * @author Sakir Murat Cengiz<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span>public abstract class Local implements BCEntity, InstructionPtr {<a name="line.16"></a>
<span class="sourceLineNo">017</span> private LocalTable _owner = null;<a name="line.17"></a>
<span class="sourceLineNo">018</span> private InstructionPtrStrategy _target = new InstructionPtrStrategy(this);<a name="line.18"></a>
<span class="sourceLineNo">019</span> private Instruction _end = null;<a name="line.19"></a>
<span class="sourceLineNo">020</span> private int _length = 0;<a name="line.20"></a>
<span class="sourceLineNo">021</span> private int _nameIndex = 0;<a name="line.21"></a>
<span class="sourceLineNo">022</span> private int _descriptorIndex = 0;<a name="line.22"></a>
<span class="sourceLineNo">023</span> private int _index = 0;<a name="line.23"></a>
<span class="sourceLineNo">024</span><a name="line.24"></a>
<span class="sourceLineNo">025</span> Local(LocalTable owner) {<a name="line.25"></a>
<span class="sourceLineNo">026</span> _owner = owner;<a name="line.26"></a>
<span class="sourceLineNo">027</span> }<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> * The owning table.<a name="line.30"></a>
<span class="sourceLineNo">031</span> */<a name="line.31"></a>
<span class="sourceLineNo">032</span> public LocalTable getTable() {<a name="line.32"></a>
<span class="sourceLineNo">033</span> return _owner;<a name="line.33"></a>
<span class="sourceLineNo">034</span> }<a name="line.34"></a>
<span class="sourceLineNo">035</span><a name="line.35"></a>
<span class="sourceLineNo">036</span> void invalidate() {<a name="line.36"></a>
<span class="sourceLineNo">037</span> _owner = null;<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> // Local index operations<a name="line.41"></a>
<span class="sourceLineNo">042</span> //////////////////////////<a name="line.42"></a>
<span class="sourceLineNo">043</span><a name="line.43"></a>
<span class="sourceLineNo">044</span> /**<a name="line.44"></a>
<span class="sourceLineNo">045</span> * Get the local variable index of the current frame for this local.<a name="line.45"></a>
<span class="sourceLineNo">046</span> */<a name="line.46"></a>
<span class="sourceLineNo">047</span> public int getLocal() {<a name="line.47"></a>
<span class="sourceLineNo">048</span> return _index;<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> * Set the local variable index of the current frame for this local.<a name="line.52"></a>
<span class="sourceLineNo">053</span> */<a name="line.53"></a>
<span class="sourceLineNo">054</span> public void setLocal(int index) {<a name="line.54"></a>
<span class="sourceLineNo">055</span> _index = index;<a name="line.55"></a>
<span class="sourceLineNo">056</span> }<a name="line.56"></a>
<span class="sourceLineNo">057</span><a name="line.57"></a>
<span class="sourceLineNo">058</span> /**<a name="line.58"></a>
<span class="sourceLineNo">059</span> * Return the parameter that this local corresponds to, or -1 if none.<a name="line.59"></a>
<span class="sourceLineNo">060</span> */<a name="line.60"></a>
<span class="sourceLineNo">061</span> public int getParam() {<a name="line.61"></a>
<span class="sourceLineNo">062</span> return getCode().getParamsIndex(getLocal());<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> /**<a name="line.65"></a>
<span class="sourceLineNo">066</span> * Set the method parameter that this local corresponds to.<a name="line.66"></a>
<span class="sourceLineNo">067</span> */<a name="line.67"></a>
<span class="sourceLineNo">068</span> public void setParam(int param) {<a name="line.68"></a>
<span class="sourceLineNo">069</span> setLocal(_owner.getCode().getLocalsIndex(param));<a name="line.69"></a>
<span class="sourceLineNo">070</span> }<a name="line.70"></a>
<span class="sourceLineNo">071</span><a name="line.71"></a>
<span class="sourceLineNo">072</span> ////////////////////////////<a name="line.72"></a>
<span class="sourceLineNo">073</span> // Start, Length operations<a name="line.73"></a>
<span class="sourceLineNo">074</span> ////////////////////////////<a name="line.74"></a>
<span class="sourceLineNo">075</span><a name="line.75"></a>
<span class="sourceLineNo">076</span> /**<a name="line.76"></a>
<span class="sourceLineNo">077</span> * Return the index into the code byte array at which this local starts.<a name="line.77"></a>
<span class="sourceLineNo">078</span> */<a name="line.78"></a>
<span class="sourceLineNo">079</span> public int getStartPc() {<a name="line.79"></a>
<span class="sourceLineNo">080</span> return _target.getByteIndex();<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> /**<a name="line.83"></a>
<span class="sourceLineNo">084</span> * Return the instruction marking the beginning of this local.<a name="line.84"></a>
<span class="sourceLineNo">085</span> */<a name="line.85"></a>
<span class="sourceLineNo">086</span> public Instruction getStart() {<a name="line.86"></a>
<span class="sourceLineNo">087</span> return _target.getTargetInstruction();<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> /**<a name="line.90"></a>
<span class="sourceLineNo">091</span> * Set the index into the code byte array at which this local starts.<a name="line.91"></a>
<span class="sourceLineNo">092</span> */<a name="line.92"></a>
<span class="sourceLineNo">093</span> public void setStartPc(int startPc) {<a name="line.93"></a>
<span class="sourceLineNo">094</span> _target.setByteIndex(startPc);<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> /**<a name="line.97"></a>
<span class="sourceLineNo">098</span> * Set the {@link Instruction} marking the beginning this local.<a name="line.98"></a>
<span class="sourceLineNo">099</span> * The instruction must already be a part of the method.<a name="line.99"></a>
<span class="sourceLineNo">100</span> * WARNING: if this instruction is deleted, the results are undefined.<a name="line.100"></a>
<span class="sourceLineNo">101</span> */<a name="line.101"></a>
<span class="sourceLineNo">102</span> public void setStart(Instruction instruction) {<a name="line.102"></a>
<span class="sourceLineNo">103</span> _target.setTargetInstruction(instruction);<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> * The last {@link Instruction} for which this local is in scope.<a name="line.107"></a>
<span class="sourceLineNo">108</span> */<a name="line.108"></a>
<span class="sourceLineNo">109</span> public Instruction getEnd() {<a name="line.109"></a>
<span class="sourceLineNo">110</span> if (_end != null)<a name="line.110"></a>
<span class="sourceLineNo">111</span> return _end;<a name="line.111"></a>
<span class="sourceLineNo">112</span> int idx = _target.getByteIndex() + _length;<a name="line.112"></a>
<span class="sourceLineNo">113</span> Instruction end = getCode().getInstruction(idx);<a name="line.113"></a>
<span class="sourceLineNo">114</span> if (end != null && (end.prev instanceof Instruction)) {<a name="line.114"></a>
<span class="sourceLineNo">115</span> return (Instruction) end.prev;<a name="line.115"></a>
<span class="sourceLineNo">116</span> }<a name="line.116"></a>
<span class="sourceLineNo">117</span> return getCode().getLastInstruction();<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> * Get the number of bytes for which this local has a value in<a name="line.121"></a>
<span class="sourceLineNo">122</span> * the code byte array.<a name="line.122"></a>
<span class="sourceLineNo">123</span> */<a name="line.123"></a>
<span class="sourceLineNo">124</span> public int getLength() {<a name="line.124"></a>
<span class="sourceLineNo">125</span> if (_end != null)<a name="line.125"></a>
<span class="sourceLineNo">126</span> return _end.getByteIndex() + _end.getLength() <a name="line.126"></a>
<span class="sourceLineNo">127</span> - _target.getByteIndex();<a name="line.127"></a>
<span class="sourceLineNo">128</span> return _length;<a name="line.128"></a>
<span class="sourceLineNo">129</span> }<a name="line.129"></a>
<span class="sourceLineNo">130</span><a name="line.130"></a>
<span class="sourceLineNo">131</span> /**<a name="line.131"></a>
<span class="sourceLineNo">132</span> * Set the last {@link Instruction} for which this local is in scope.<a name="line.132"></a>
<span class="sourceLineNo">133</span> * The instruction must already be a part of the method.<a name="line.133"></a>
<span class="sourceLineNo">134</span> * WARNING: if this instruction is deleted, the results are undefined.<a name="line.134"></a>
<span class="sourceLineNo">135</span> */<a name="line.135"></a>
<span class="sourceLineNo">136</span> public void setEnd(Instruction end) {<a name="line.136"></a>
<span class="sourceLineNo">137</span> if (end.getCode() != getCode())<a name="line.137"></a>
<span class="sourceLineNo">138</span> throw new IllegalArgumentException("Instruction pointers and " <a name="line.138"></a>
<span class="sourceLineNo">139</span> + "targets must be part of the same code block.");<a name="line.139"></a>
<span class="sourceLineNo">140</span> _end = end;<a name="line.140"></a>
<span class="sourceLineNo">141</span> _length = -1;<a name="line.141"></a>
<span class="sourceLineNo">142</span> }<a name="line.142"></a>
<span class="sourceLineNo">143</span><a name="line.143"></a>
<span class="sourceLineNo">144</span> /**<a name="line.144"></a>
<span class="sourceLineNo">145</span> * Set the number of bytes for which this local has a value in<a name="line.145"></a>
<span class="sourceLineNo">146</span> * the code byte array.<a name="line.146"></a>
<span class="sourceLineNo">147</span> */<a name="line.147"></a>
<span class="sourceLineNo">148</span> public void setLength(int length) {<a name="line.148"></a>
<span class="sourceLineNo">149</span> if (length < 0)<a name="line.149"></a>
<span class="sourceLineNo">150</span> throw new IllegalArgumentException(String.valueOf(length));<a name="line.150"></a>
<span class="sourceLineNo">151</span> _length = length;<a name="line.151"></a>
<span class="sourceLineNo">152</span> _end = null;<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> public void updateTargets() {<a name="line.155"></a>
<span class="sourceLineNo">156</span> _target.updateTargets();<a name="line.156"></a>
<span class="sourceLineNo">157</span> _end = getEnd();<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> public void replaceTarget(Instruction oldTarget, Instruction newTarget) {<a name="line.160"></a>
<span class="sourceLineNo">161</span> _target.replaceTarget(oldTarget, newTarget);<a name="line.161"></a>
<span class="sourceLineNo">162</span> if (getEnd() == oldTarget)<a name="line.162"></a>
<span class="sourceLineNo">163</span> setEnd(newTarget);<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>
<span class="sourceLineNo">166</span> /////////////////////////<a name="line.166"></a>
<span class="sourceLineNo">167</span> // Name, Type operations<a name="line.167"></a>
<span class="sourceLineNo">168</span> /////////////////////////<a name="line.168"></a>
<span class="sourceLineNo">169</span><a name="line.169"></a>
<span class="sourceLineNo">170</span> /**<a name="line.170"></a>
<span class="sourceLineNo">171</span> * Return the {@link ConstantPool} index of the {@link UTF8Entry} that<a name="line.171"></a>
<span class="sourceLineNo">172</span> * describes the name of this local. Defaults to 0.<a name="line.172"></a>
<span class="sourceLineNo">173</span> */<a name="line.173"></a>
<span class="sourceLineNo">174</span> public int getNameIndex() {<a name="line.174"></a>
<span class="sourceLineNo">175</span> return _nameIndex;<a name="line.175"></a>
<span class="sourceLineNo">176</span> }<a name="line.176"></a>
<span class="sourceLineNo">177</span><a name="line.177"></a>
<span class="sourceLineNo">178</span> /**<a name="line.178"></a>
<span class="sourceLineNo">179</span> * Set the {@link ConstantPool} index of the {@link UTF8Entry} that<a name="line.179"></a>
<span class="sourceLineNo">180</span> * describes the name of this local.<a name="line.180"></a>
<span class="sourceLineNo">181</span> */<a name="line.181"></a>
<span class="sourceLineNo">182</span> public void setNameIndex(int nameIndex) {<a name="line.182"></a>
<span class="sourceLineNo">183</span> _nameIndex = nameIndex;<a name="line.183"></a>
<span class="sourceLineNo">184</span> }<a name="line.184"></a>
<span class="sourceLineNo">185</span><a name="line.185"></a>
<span class="sourceLineNo">186</span> /**<a name="line.186"></a>
<span class="sourceLineNo">187</span> * Return the name of this local, or null if unset.<a name="line.187"></a>
<span class="sourceLineNo">188</span> */<a name="line.188"></a>
<span class="sourceLineNo">189</span> public String getName() {<a name="line.189"></a>
<span class="sourceLineNo">190</span> if (getNameIndex() == 0)<a name="line.190"></a>
<span class="sourceLineNo">191</span> return null;<a name="line.191"></a>
<span class="sourceLineNo">192</span> return ((UTF8Entry) getPool().getEntry(getNameIndex())).getValue();<a name="line.192"></a>
<span class="sourceLineNo">193</span> }<a name="line.193"></a>
<span class="sourceLineNo">194</span><a name="line.194"></a>
<span class="sourceLineNo">195</span> /**<a name="line.195"></a>
<span class="sourceLineNo">196</span> * Set the name of this inner local.<a name="line.196"></a>
<span class="sourceLineNo">197</span> */<a name="line.197"></a>
<span class="sourceLineNo">198</span> public void setName(String name) {<a name="line.198"></a>
<span class="sourceLineNo">199</span> if (name == null)<a name="line.199"></a>
<span class="sourceLineNo">200</span> setNameIndex(0);<a name="line.200"></a>
<span class="sourceLineNo">201</span> else<a name="line.201"></a>
<span class="sourceLineNo">202</span> setNameIndex(getPool().findUTF8Entry(name, true));<a name="line.202"></a>
<span class="sourceLineNo">203</span> }<a name="line.203"></a>
<span class="sourceLineNo">204</span><a name="line.204"></a>
<span class="sourceLineNo">205</span> /**<a name="line.205"></a>
<span class="sourceLineNo">206</span> * Return the {@link ConstantPool} index of the {@link UTF8Entry} that<a name="line.206"></a>
<span class="sourceLineNo">207</span> * describes this local. Defaults to 0.<a name="line.207"></a>
<span class="sourceLineNo">208</span> */<a name="line.208"></a>
<span class="sourceLineNo">209</span> public int getTypeIndex() {<a name="line.209"></a>
<span class="sourceLineNo">210</span> return _descriptorIndex;<a name="line.210"></a>
<span class="sourceLineNo">211</span> }<a name="line.211"></a>
<span class="sourceLineNo">212</span><a name="line.212"></a>
<span class="sourceLineNo">213</span> /**<a name="line.213"></a>
<span class="sourceLineNo">214</span> * Set the {@link ConstantPool} index of the {@link UTF8Entry} that<a name="line.214"></a>
<span class="sourceLineNo">215</span> * describes this local.<a name="line.215"></a>
<span class="sourceLineNo">216</span> */<a name="line.216"></a>
<span class="sourceLineNo">217</span> public void setTypeIndex(int index) {<a name="line.217"></a>
<span class="sourceLineNo">218</span> _descriptorIndex = index;<a name="line.218"></a>
<span class="sourceLineNo">219</span> }<a name="line.219"></a>
<span class="sourceLineNo">220</span><a name="line.220"></a>
<span class="sourceLineNo">221</span> /**<a name="line.221"></a>
<span class="sourceLineNo">222</span> * Return the full name of the local's type, or null if unset.<a name="line.222"></a>
<span class="sourceLineNo">223</span> */<a name="line.223"></a>
<span class="sourceLineNo">224</span> public String getTypeName() {<a name="line.224"></a>
<span class="sourceLineNo">225</span> if (getTypeIndex() == 0)<a name="line.225"></a>
<span class="sourceLineNo">226</span> return null;<a name="line.226"></a>
<span class="sourceLineNo">227</span> UTF8Entry entry = (UTF8Entry) getPool().getEntry(getTypeIndex());<a name="line.227"></a>
<span class="sourceLineNo">228</span> return getProject().getNameCache().getExternalForm(entry.getValue(), <a name="line.228"></a>
<span class="sourceLineNo">229</span> false);<a name="line.229"></a>
<span class="sourceLineNo">230</span> }<a name="line.230"></a>
<span class="sourceLineNo">231</span><a name="line.231"></a>
<span class="sourceLineNo">232</span> /**<a name="line.232"></a>
<span class="sourceLineNo">233</span> * Set the type of this local.<a name="line.233"></a>
<span class="sourceLineNo">234</span> */<a name="line.234"></a>
<span class="sourceLineNo">235</span> public void setType(String type) {<a name="line.235"></a>
<span class="sourceLineNo">236</span> if (type == null)<a name="line.236"></a>
<span class="sourceLineNo">237</span> setTypeIndex(0);<a name="line.237"></a>
<span class="sourceLineNo">238</span> else {<a name="line.238"></a>
<span class="sourceLineNo">239</span> type = getProject().getNameCache().getInternalForm(type, true);<a name="line.239"></a>
<span class="sourceLineNo">240</span> setTypeIndex(getPool().findUTF8Entry(type, true));<a name="line.240"></a>
<span class="sourceLineNo">241</span> }<a name="line.241"></a>
<span class="sourceLineNo">242</span> }<a name="line.242"></a>
<span class="sourceLineNo">243</span><a name="line.243"></a>
<span class="sourceLineNo">244</span> ///////////////////////////<a name="line.244"></a>
<span class="sourceLineNo">245</span> // BCEntity implementation<a name="line.245"></a>
<span class="sourceLineNo">246</span> ///////////////////////////<a name="line.246"></a>
<span class="sourceLineNo">247</span><a name="line.247"></a>
<span class="sourceLineNo">248</span> public Project getProject() {<a name="line.248"></a>
<span class="sourceLineNo">249</span> return _owner.getProject();<a name="line.249"></a>
<span class="sourceLineNo">250</span> }<a name="line.250"></a>
<span class="sourceLineNo">251</span><a name="line.251"></a>
<span class="sourceLineNo">252</span> public ConstantPool getPool() {<a name="line.252"></a>
<span class="sourceLineNo">253</span> return _owner.getPool();<a name="line.253"></a>
<span class="sourceLineNo">254</span> }<a name="line.254"></a>
<span class="sourceLineNo">255</span><a name="line.255"></a>
<span class="sourceLineNo">256</span> public ClassLoader getClassLoader() {<a name="line.256"></a>
<span class="sourceLineNo">257</span> return _owner.getClassLoader();<a name="line.257"></a>
<span class="sourceLineNo">258</span> }<a name="line.258"></a>
<span class="sourceLineNo">259</span><a name="line.259"></a>
<span class="sourceLineNo">260</span> public boolean isValid() {<a name="line.260"></a>
<span class="sourceLineNo">261</span> return _owner != null;<a name="line.261"></a>
<span class="sourceLineNo">262</span> }<a name="line.262"></a>
<span class="sourceLineNo">263</span><a name="line.263"></a>
<span class="sourceLineNo">264</span> //////////////////<a name="line.264"></a>
<span class="sourceLineNo">265</span> // I/O operations<a name="line.265"></a>
<span class="sourceLineNo">266</span> //////////////////<a name="line.266"></a>
<span class="sourceLineNo">267</span><a name="line.267"></a>
<span class="sourceLineNo">268</span> void read(DataInput in) throws IOException {<a name="line.268"></a>
<span class="sourceLineNo">269</span> setStartPc(in.readUnsignedShort());<a name="line.269"></a>
<span class="sourceLineNo">270</span> setLength(in.readUnsignedShort());<a name="line.270"></a>
<span class="sourceLineNo">271</span> setNameIndex(in.readUnsignedShort());<a name="line.271"></a>
<span class="sourceLineNo">272</span> setTypeIndex(in.readUnsignedShort());<a name="line.272"></a>
<span class="sourceLineNo">273</span> setLocal(in.readUnsignedShort());<a name="line.273"></a>
<span class="sourceLineNo">274</span> }<a name="line.274"></a>
<span class="sourceLineNo">275</span><a name="line.275"></a>
<span class="sourceLineNo">276</span> void write(DataOutput out) throws IOException {<a name="line.276"></a>
<span class="sourceLineNo">277</span> out.writeShort(getStartPc());<a name="line.277"></a>
<span class="sourceLineNo">278</span> out.writeShort(getLength());<a name="line.278"></a>
<span class="sourceLineNo">279</span> out.writeShort(getNameIndex());<a name="line.279"></a>
<span class="sourceLineNo">280</span> out.writeShort(getTypeIndex());<a name="line.280"></a>
<span class="sourceLineNo">281</span> out.writeShort(getLocal());<a name="line.281"></a>
<span class="sourceLineNo">282</span> }<a name="line.282"></a>
<span class="sourceLineNo">283</span><a name="line.283"></a>
<span class="sourceLineNo">284</span> public Code getCode() {<a name="line.284"></a>
<span class="sourceLineNo">285</span> return _owner.getCode();<a name="line.285"></a>
<span class="sourceLineNo">286</span> }<a name="line.286"></a>
<span class="sourceLineNo">287</span>}<a name="line.287"></a>
</pre>
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