/*
* @(#)NullExpression.java 1.10 95/09/14 Arthur van Hoff
*
* Copyright (c) 1994 Sun Microsystems, Inc. All Rights Reserved.
*
* Permission to use, copy, modify, and distribute this software
* and its documentation for NON-COMMERCIAL purposes and without
* fee is hereby granted provided that this copyright notice
* appears in all copies. Please refer to the file "copyright.html"
* for further important copyright and licensing information.
*
* SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
* THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
* TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
*/
package sun.tools.tree;
import sun.tools.java.*;
import sun.tools.asm.Assembler;
import java.io.PrintStream;
public
class NullExpression extends ConstantExpression {
/**
* Constructor
*/
public NullExpression(int where) {
super(NULL, where, Type.tNull);
}
/**
* Check if the expression is equal to a value
*/
public boolean equals(int i) {
return i == 0;
}
/**
* Code
*/
public void codeValue(Environment env, Context ctx, Assembler asm) {
asm.add(where, opc_aconst_null);
}
/**
* Print
*/
public void print(PrintStream out) {
out.print("null");
}
}