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/*
* $Id: AbsoluteLocationPath.java,v 1.10 2010-11-01 04:34:14 joehw Exp $
*/
package com.sun.org.apache.xalan.internal.xsltc.compiler;
import com.sun.org.apache.bcel.internal.generic.ALOAD;
import com.sun.org.apache.bcel.internal.generic.ASTORE;
import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
import com.sun.org.apache.bcel.internal.generic.INVOKEINTERFACE;
import com.sun.org.apache.bcel.internal.generic.INVOKESPECIAL;
import com.sun.org.apache.bcel.internal.generic.InstructionList;
import com.sun.org.apache.bcel.internal.generic.LocalVariableGen;
import com.sun.org.apache.bcel.internal.generic.NEW;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.NodeType;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Util;
/**
* @author Jacek Ambroziak
* @author Santiago Pericas-Geertsen
*/
final class AbsoluteLocationPath extends Expression {
private Expression _path; // may be null
public AbsoluteLocationPath() {
_path = null;
}
public AbsoluteLocationPath(Expression path) {
_path = path;
if (path != null) {
_path.setParent(this);
}
}
public void setParser(Parser parser) {
super.setParser(parser);
if (_path != null) {
_path.setParser(parser);
}
}
public Expression getPath() {
return(_path);
}
public String toString() {
return "AbsoluteLocationPath(" +
(_path != null ? _path.toString() : "null") + ')';
}
public Type typeCheck(SymbolTable stable) throws TypeCheckError {
if (_path != null) {
final Type ptype = _path.typeCheck(stable);
if (ptype instanceof NodeType) { // promote to node-set
_path = new CastExpr(_path, Type.NodeSet);
}
}
return _type = Type.NodeSet;
}
public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
if (_path != null) {
final int initAI = cpg.addMethodref(ABSOLUTE_ITERATOR,
"",
"("
+ NODE_ITERATOR_SIG
+ ")V");
// Compile relative path iterator(s)
//
// Backwards branches are prohibited if an uninitialized object is
// on the stack by section 4.9.4 of the JVM Specification, 2nd Ed.
// We don't know whether this code might contain backwards branches,
// so we mustn't create the new object until after we've created
// this argument to its constructor. Instead we calculate the
// value of the argument to the constructor first, store it in
// a temporary variable, create the object and reload the argument
// from the temporary to avoid the problem.
_path.translate(classGen, methodGen);
LocalVariableGen relPathIterator
= methodGen.addLocalVariable("abs_location_path_tmp",
Util.getJCRefType(NODE_ITERATOR_SIG),
il.getEnd(), null);
il.append(new ASTORE(relPathIterator.getIndex()));
// Create new AbsoluteIterator
il.append(new NEW(cpg.addClass(ABSOLUTE_ITERATOR)));
il.append(DUP);
il.append(new ALOAD(relPathIterator.getIndex()));
// Initialize AbsoluteIterator with iterator from the stack
il.append(new INVOKESPECIAL(initAI));
}
else {
final int gitr = cpg.addInterfaceMethodref(DOM_INTF,
"getIterator",
"()"+NODE_ITERATOR_SIG);
il.append(methodGen.loadDOM());
il.append(new INVOKEINTERFACE(gitr, 1));
}
}
}