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<FONT color="green">001</FONT>    /*<a name="line.1"></a>
<FONT color="green">002</FONT>     * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a>
<FONT color="green">003</FONT>     * or more contributor license agreements. See the NOTICE file<a name="line.3"></a>
<FONT color="green">004</FONT>     * distributed with this work for additional information<a name="line.4"></a>
<FONT color="green">005</FONT>     * regarding copyright ownership. The ASF licenses this file<a name="line.5"></a>
<FONT color="green">006</FONT>     * to you under the Apache License, Version 2.0 (the  "License");<a name="line.6"></a>
<FONT color="green">007</FONT>     * you may not use this file except in compliance with the License.<a name="line.7"></a>
<FONT color="green">008</FONT>     * You may obtain a copy of the License at<a name="line.8"></a>
<FONT color="green">009</FONT>     *<a name="line.9"></a>
<FONT color="green">010</FONT>     *     http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a>
<FONT color="green">011</FONT>     *<a name="line.11"></a>
<FONT color="green">012</FONT>     * Unless required by applicable law or agreed to in writing, software<a name="line.12"></a>
<FONT color="green">013</FONT>     * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a>
<FONT color="green">014</FONT>     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a>
<FONT color="green">015</FONT>     * See the License for the specific language governing permissions and<a name="line.15"></a>
<FONT color="green">016</FONT>     * limitations under the License.<a name="line.16"></a>
<FONT color="green">017</FONT>     */<a name="line.17"></a>
<FONT color="green">018</FONT>    /*<a name="line.18"></a>
<FONT color="green">019</FONT>     * $Id: Variable.java 468650 2006-10-28 07:03:30Z minchau $<a name="line.19"></a>
<FONT color="green">020</FONT>     */<a name="line.20"></a>
<FONT color="green">021</FONT>    <a name="line.21"></a>
<FONT color="green">022</FONT>    package org.apache.xalan.xsltc.compiler;<a name="line.22"></a>
<FONT color="green">023</FONT>    <a name="line.23"></a>
<FONT color="green">024</FONT>    import org.apache.bcel.classfile.Field;<a name="line.24"></a>
<FONT color="green">025</FONT>    import org.apache.bcel.generic.ACONST_NULL;<a name="line.25"></a>
<FONT color="green">026</FONT>    import org.apache.bcel.generic.ConstantPoolGen;<a name="line.26"></a>
<FONT color="green">027</FONT>    import org.apache.bcel.generic.DCONST;<a name="line.27"></a>
<FONT color="green">028</FONT>    import org.apache.bcel.generic.ICONST;<a name="line.28"></a>
<FONT color="green">029</FONT>    import org.apache.bcel.generic.InstructionHandle;<a name="line.29"></a>
<FONT color="green">030</FONT>    import org.apache.bcel.generic.InstructionList;<a name="line.30"></a>
<FONT color="green">031</FONT>    import org.apache.bcel.generic.PUTFIELD;<a name="line.31"></a>
<FONT color="green">032</FONT>    import org.apache.xalan.xsltc.compiler.util.BooleanType;<a name="line.32"></a>
<FONT color="green">033</FONT>    import org.apache.xalan.xsltc.compiler.util.ClassGenerator;<a name="line.33"></a>
<FONT color="green">034</FONT>    import org.apache.xalan.xsltc.compiler.util.ErrorMsg;<a name="line.34"></a>
<FONT color="green">035</FONT>    import org.apache.xalan.xsltc.compiler.util.IntType;<a name="line.35"></a>
<FONT color="green">036</FONT>    import org.apache.xalan.xsltc.compiler.util.MethodGenerator;<a name="line.36"></a>
<FONT color="green">037</FONT>    import org.apache.xalan.xsltc.compiler.util.NodeType;<a name="line.37"></a>
<FONT color="green">038</FONT>    import org.apache.xalan.xsltc.compiler.util.RealType;<a name="line.38"></a>
<FONT color="green">039</FONT>    import org.apache.xalan.xsltc.compiler.util.Type;<a name="line.39"></a>
<FONT color="green">040</FONT>    import org.apache.xalan.xsltc.compiler.util.TypeCheckError;<a name="line.40"></a>
<FONT color="green">041</FONT>    <a name="line.41"></a>
<FONT color="green">042</FONT>    final class Variable extends VariableBase {<a name="line.42"></a>
<FONT color="green">043</FONT>    <a name="line.43"></a>
<FONT color="green">044</FONT>        public int getIndex() {<a name="line.44"></a>
<FONT color="green">045</FONT>            return (_local != null) ? _local.getIndex() : -1;<a name="line.45"></a>
<FONT color="green">046</FONT>        }<a name="line.46"></a>
<FONT color="green">047</FONT>    <a name="line.47"></a>
<FONT color="green">048</FONT>        /**<a name="line.48"></a>
<FONT color="green">049</FONT>         * Parse the contents of the variable<a name="line.49"></a>
<FONT color="green">050</FONT>         */<a name="line.50"></a>
<FONT color="green">051</FONT>        public void parseContents(Parser parser) {<a name="line.51"></a>
<FONT color="green">052</FONT>            // Parse 'name' and 'select' attributes plus parameter contents<a name="line.52"></a>
<FONT color="green">053</FONT>            super.parseContents(parser);<a name="line.53"></a>
<FONT color="green">054</FONT>    <a name="line.54"></a>
<FONT color="green">055</FONT>            // Add a ref to this var to its enclosing construct<a name="line.55"></a>
<FONT color="green">056</FONT>            SyntaxTreeNode parent = getParent();<a name="line.56"></a>
<FONT color="green">057</FONT>            if (parent instanceof Stylesheet) {<a name="line.57"></a>
<FONT color="green">058</FONT>                // Mark this as a global variable<a name="line.58"></a>
<FONT color="green">059</FONT>                _isLocal = false;<a name="line.59"></a>
<FONT color="green">060</FONT>                // Check if a global variable with this name already exists...<a name="line.60"></a>
<FONT color="green">061</FONT>                Variable var = parser.getSymbolTable().lookupVariable(_name);<a name="line.61"></a>
<FONT color="green">062</FONT>                // ...and if it does we need to check import precedence<a name="line.62"></a>
<FONT color="green">063</FONT>                if (var != null) {<a name="line.63"></a>
<FONT color="green">064</FONT>                    final int us = this.getImportPrecedence();<a name="line.64"></a>
<FONT color="green">065</FONT>                    final int them = var.getImportPrecedence();<a name="line.65"></a>
<FONT color="green">066</FONT>                    // It is an error if the two have the same import precedence<a name="line.66"></a>
<FONT color="green">067</FONT>                    if (us == them) {<a name="line.67"></a>
<FONT color="green">068</FONT>                        final String name = _name.toString();<a name="line.68"></a>
<FONT color="green">069</FONT>                        reportError(this, parser, ErrorMsg.VARIABLE_REDEF_ERR,name);<a name="line.69"></a>
<FONT color="green">070</FONT>                    }<a name="line.70"></a>
<FONT color="green">071</FONT>                    // Ignore this if previous definition has higher precedence<a name="line.71"></a>
<FONT color="green">072</FONT>                    else if (them &gt; us) {<a name="line.72"></a>
<FONT color="green">073</FONT>                        _ignore = true;<a name="line.73"></a>
<FONT color="green">074</FONT>                        return;<a name="line.74"></a>
<FONT color="green">075</FONT>                    }<a name="line.75"></a>
<FONT color="green">076</FONT>                    else {<a name="line.76"></a>
<FONT color="green">077</FONT>                        var.disable();<a name="line.77"></a>
<FONT color="green">078</FONT>                    }<a name="line.78"></a>
<FONT color="green">079</FONT>                    // Add this variable if we have higher precedence<a name="line.79"></a>
<FONT color="green">080</FONT>                }<a name="line.80"></a>
<FONT color="green">081</FONT>                ((Stylesheet)parent).addVariable(this);<a name="line.81"></a>
<FONT color="green">082</FONT>                parser.getSymbolTable().addVariable(this);<a name="line.82"></a>
<FONT color="green">083</FONT>            }<a name="line.83"></a>
<FONT color="green">084</FONT>            else {<a name="line.84"></a>
<FONT color="green">085</FONT>                _isLocal = true;<a name="line.85"></a>
<FONT color="green">086</FONT>            }<a name="line.86"></a>
<FONT color="green">087</FONT>        }<a name="line.87"></a>
<FONT color="green">088</FONT>    <a name="line.88"></a>
<FONT color="green">089</FONT>        /**<a name="line.89"></a>
<FONT color="green">090</FONT>         * Runs a type check on either the variable element body or the<a name="line.90"></a>
<FONT color="green">091</FONT>         * expression in the 'select' attribute<a name="line.91"></a>
<FONT color="green">092</FONT>         */<a name="line.92"></a>
<FONT color="green">093</FONT>        public Type typeCheck(SymbolTable stable) throws TypeCheckError {<a name="line.93"></a>
<FONT color="green">094</FONT>    <a name="line.94"></a>
<FONT color="green">095</FONT>            // Type check the 'select' expression if present<a name="line.95"></a>
<FONT color="green">096</FONT>            if (_select != null) {<a name="line.96"></a>
<FONT color="green">097</FONT>                _type = _select.typeCheck(stable);<a name="line.97"></a>
<FONT color="green">098</FONT>            }<a name="line.98"></a>
<FONT color="green">099</FONT>            // Type check the element contents otherwise<a name="line.99"></a>
<FONT color="green">100</FONT>            else if (hasContents()) {<a name="line.100"></a>
<FONT color="green">101</FONT>                typeCheckContents(stable);<a name="line.101"></a>
<FONT color="green">102</FONT>                _type = Type.ResultTree;<a name="line.102"></a>
<FONT color="green">103</FONT>            }<a name="line.103"></a>
<FONT color="green">104</FONT>            else {<a name="line.104"></a>
<FONT color="green">105</FONT>                _type = Type.Reference;<a name="line.105"></a>
<FONT color="green">106</FONT>            }<a name="line.106"></a>
<FONT color="green">107</FONT>            // The return type is void as the variable element does not leave<a name="line.107"></a>
<FONT color="green">108</FONT>            // anything on the JVM's stack. The '_type' global will be returned<a name="line.108"></a>
<FONT color="green">109</FONT>            // by the references to this variable, and not by the variable itself.<a name="line.109"></a>
<FONT color="green">110</FONT>            return Type.Void;<a name="line.110"></a>
<FONT color="green">111</FONT>        }<a name="line.111"></a>
<FONT color="green">112</FONT>    <a name="line.112"></a>
<FONT color="green">113</FONT>        /**<a name="line.113"></a>
<FONT color="green">114</FONT>         * This method is part of a little trick that is needed to use local<a name="line.114"></a>
<FONT color="green">115</FONT>         * variables inside nested for-each loops. See the initializeVariables()<a name="line.115"></a>
<FONT color="green">116</FONT>         * method in the ForEach class for an explanation<a name="line.116"></a>
<FONT color="green">117</FONT>         */<a name="line.117"></a>
<FONT color="green">118</FONT>        public void initialize(ClassGenerator classGen, MethodGenerator methodGen) {<a name="line.118"></a>
<FONT color="green">119</FONT>            final ConstantPoolGen cpg = classGen.getConstantPool();<a name="line.119"></a>
<FONT color="green">120</FONT>            final InstructionList il = methodGen.getInstructionList();<a name="line.120"></a>
<FONT color="green">121</FONT>    <a name="line.121"></a>
<FONT color="green">122</FONT>            // This is only done for local variables that are actually used<a name="line.122"></a>
<FONT color="green">123</FONT>            if (isLocal() &amp;&amp; !_refs.isEmpty()) {<a name="line.123"></a>
<FONT color="green">124</FONT>                // Create a variable slot if none is allocated<a name="line.124"></a>
<FONT color="green">125</FONT>                if (_local == null) {<a name="line.125"></a>
<FONT color="green">126</FONT>                    _local = methodGen.addLocalVariable2(getEscapedName(),<a name="line.126"></a>
<FONT color="green">127</FONT>                                                         _type.toJCType(),<a name="line.127"></a>
<FONT color="green">128</FONT>                                                         null);<a name="line.128"></a>
<FONT color="green">129</FONT>                }<a name="line.129"></a>
<FONT color="green">130</FONT>                // Push the default value on the JVM's stack<a name="line.130"></a>
<FONT color="green">131</FONT>                if ((_type instanceof IntType) ||<a name="line.131"></a>
<FONT color="green">132</FONT>                    (_type instanceof NodeType) ||<a name="line.132"></a>
<FONT color="green">133</FONT>                    (_type instanceof BooleanType))<a name="line.133"></a>
<FONT color="green">134</FONT>                    il.append(new ICONST(0)); // 0 for node-id, integer and boolean<a name="line.134"></a>
<FONT color="green">135</FONT>                else if (_type instanceof RealType)<a name="line.135"></a>
<FONT color="green">136</FONT>                    il.append(new DCONST(0)); // 0.0 for floating point numbers<a name="line.136"></a>
<FONT color="green">137</FONT>                else<a name="line.137"></a>
<FONT color="green">138</FONT>                    il.append(new ACONST_NULL()); // and 'null' for anything else<a name="line.138"></a>
<FONT color="green">139</FONT>    <a name="line.139"></a>
<FONT color="green">140</FONT>                // Mark the store as the start of the live range of the variable<a name="line.140"></a>
<FONT color="green">141</FONT>                _local.setStart(il.append(_type.STORE(_local.getIndex())));<a name="line.141"></a>
<FONT color="green">142</FONT>            }<a name="line.142"></a>
<FONT color="green">143</FONT>        }<a name="line.143"></a>
<FONT color="green">144</FONT>    <a name="line.144"></a>
<FONT color="green">145</FONT>        public void translate(ClassGenerator classGen, MethodGenerator methodGen) {<a name="line.145"></a>
<FONT color="green">146</FONT>            final ConstantPoolGen cpg = classGen.getConstantPool();<a name="line.146"></a>
<FONT color="green">147</FONT>            final InstructionList il = methodGen.getInstructionList();<a name="line.147"></a>
<FONT color="green">148</FONT>    <a name="line.148"></a>
<FONT color="green">149</FONT>            // Don't generate code for unreferenced variables<a name="line.149"></a>
<FONT color="green">150</FONT>            if (_refs.isEmpty()) {<a name="line.150"></a>
<FONT color="green">151</FONT>                _ignore = true;<a name="line.151"></a>
<FONT color="green">152</FONT>            }<a name="line.152"></a>
<FONT color="green">153</FONT>    <a name="line.153"></a>
<FONT color="green">154</FONT>            // Make sure that a variable instance is only compiled once<a name="line.154"></a>
<FONT color="green">155</FONT>            if (_ignore) return;<a name="line.155"></a>
<FONT color="green">156</FONT>            _ignore = true;<a name="line.156"></a>
<FONT color="green">157</FONT>    <a name="line.157"></a>
<FONT color="green">158</FONT>            final String name = getEscapedName();<a name="line.158"></a>
<FONT color="green">159</FONT>    <a name="line.159"></a>
<FONT color="green">160</FONT>            if (isLocal()) {<a name="line.160"></a>
<FONT color="green">161</FONT>                // Compile variable value computation<a name="line.161"></a>
<FONT color="green">162</FONT>                translateValue(classGen, methodGen);<a name="line.162"></a>
<FONT color="green">163</FONT>    <a name="line.163"></a>
<FONT color="green">164</FONT>                // Add a new local variable and store value<a name="line.164"></a>
<FONT color="green">165</FONT>                boolean createLocal = _local == null;<a name="line.165"></a>
<FONT color="green">166</FONT>                if (createLocal) {<a name="line.166"></a>
<FONT color="green">167</FONT>                    mapRegister(methodGen);<a name="line.167"></a>
<FONT color="green">168</FONT>                }<a name="line.168"></a>
<FONT color="green">169</FONT>                InstructionHandle storeInst =<a name="line.169"></a>
<FONT color="green">170</FONT>                                      il.append(_type.STORE(_local.getIndex()));<a name="line.170"></a>
<FONT color="green">171</FONT>    <a name="line.171"></a>
<FONT color="green">172</FONT>                // If the local is just being created, mark the store as the start<a name="line.172"></a>
<FONT color="green">173</FONT>                // of its live range.  Note that it might have been created by<a name="line.173"></a>
<FONT color="green">174</FONT>                // initializeVariables already, which would have set the start of<a name="line.174"></a>
<FONT color="green">175</FONT>                // the live range already.<a name="line.175"></a>
<FONT color="green">176</FONT>                if (createLocal) {<a name="line.176"></a>
<FONT color="green">177</FONT>                    _local.setStart(storeInst);<a name="line.177"></a>
<FONT color="green">178</FONT>                }<a name="line.178"></a>
<FONT color="green">179</FONT>            }<a name="line.179"></a>
<FONT color="green">180</FONT>            else {<a name="line.180"></a>
<FONT color="green">181</FONT>                String signature = _type.toSignature();<a name="line.181"></a>
<FONT color="green">182</FONT>    <a name="line.182"></a>
<FONT color="green">183</FONT>                // Global variables are store in class fields<a name="line.183"></a>
<FONT color="green">184</FONT>                if (classGen.containsField(name) == null) {<a name="line.184"></a>
<FONT color="green">185</FONT>                    classGen.addField(new Field(ACC_PUBLIC, <a name="line.185"></a>
<FONT color="green">186</FONT>                                                cpg.addUtf8(name),<a name="line.186"></a>
<FONT color="green">187</FONT>                                                cpg.addUtf8(signature),<a name="line.187"></a>
<FONT color="green">188</FONT>                                                null, cpg.getConstantPool()));<a name="line.188"></a>
<FONT color="green">189</FONT>    <a name="line.189"></a>
<FONT color="green">190</FONT>                    // Push a reference to "this" for putfield<a name="line.190"></a>
<FONT color="green">191</FONT>                    il.append(classGen.loadTranslet());<a name="line.191"></a>
<FONT color="green">192</FONT>                    // Compile variable value computation<a name="line.192"></a>
<FONT color="green">193</FONT>                    translateValue(classGen, methodGen);<a name="line.193"></a>
<FONT color="green">194</FONT>                    // Store the variable in the allocated field<a name="line.194"></a>
<FONT color="green">195</FONT>                    il.append(new PUTFIELD(cpg.addFieldref(classGen.getClassName(),<a name="line.195"></a>
<FONT color="green">196</FONT>                                                           name, signature)));<a name="line.196"></a>
<FONT color="green">197</FONT>                }<a name="line.197"></a>
<FONT color="green">198</FONT>            }<a name="line.198"></a>
<FONT color="green">199</FONT>        }<a name="line.199"></a>
<FONT color="green">200</FONT>    }<a name="line.200"></a>


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