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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 > 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() && !_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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| </PRE> |
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