/*
* @(#)LengthExpression.java 1.11 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.util.Hashtable;
public
class LengthExpression extends UnaryExpression {
/**
* Constructor
*/
public LengthExpression(int where, Expression right) {
super(LENGTH, where, Type.tInt, right);
}
/**
* Select the type of the expression
*/
public long checkValue(Environment env, Context ctx, long vset, Hashtable exp) {
vset = right.checkValue(env, ctx, vset, exp);
if (!right.type.isType(TC_ARRAY)) {
env.error(where, "invalid.length", right.type);
}
return vset;
}
/**
* Code
*/
public void codeValue(Environment env, Context ctx, Assembler asm) {
right.codeValue(env, ctx, asm);
asm.add(where, opc_arraylength);
}
}