/*
* $Id: RefNode.java,v 1.5 2002/09/16 08:05:05 jkl Exp $
*
* Copyright (c) 2002 Njet Communications Ltd. All Rights Reserved.
*
* Use is subject to license terms, as defined in
* Anvil Sofware License, Version 1.1. See LICENSE
* file, or http://njet.org/license-1.1.txt
*/
package anvil.script.expression;
import anvil.Location;
import anvil.ErrorListener;
import anvil.core.Any;
import anvil.codec.Code;
import anvil.codec.ConstantPool;
import anvil.script.compiler.ByteCompiler;
import anvil.script.Context;
import anvil.script.statements.LocalVariableStatement;
import java.io.IOException;
/**
* class RefNode
*
* @author: Jani Lehtim�ki
*/
public class RefNode extends UnaryParent
{
protected Location _location;
protected boolean _isassignment;
public RefNode(Location location, Node child, boolean isassignment)
{
super(child);
_location = location;
_isassignment = isassignment;
}
public int typeOf()
{
return Node.EXPR_VARIABLE;
}
public boolean isConstant()
{
return false;
}
public void check(ErrorListener listener)
{
super.check(listener);
if (!_isassignment) {
Node child = _child;
if (child instanceof VariableNode) {
((VariableNode)child).getVariable().markEscaped();
} else if (child instanceof EscapedVariableNode) {
// pass
} else {
listener.error(_location, "Right side of '&' does not point to local variable");
}
}
}
public void compile(ByteCompiler context, Node child)
{
Code code = context.getCode();
ConstantPool pool = code.getPool();
_child.compile(context, GET);
child.compile(context, GET);
code.dup_x1();
code.invokevirtual(pool.addMethodRef(context.TYPE_ANY, "setRef",
"(Lanvil/core/Any;)V"));
}
public void compile(ByteCompiler context, int operation)
{
Code code = context.getCode();
ConstantPool pool = code.getPool();
switch(operation) {
case GET:
case CHECK:
_child.compile(context, GET_REF);
break;
case GET_BOOLEAN:
_child.compile(context, GET_BOOLEAN);
break;
case DELETE:
code.iconst(false);
break;
}
}
}