/*
* @(#)SuperExpression.java 1.13 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 SuperExpression extends Expression {
LocalField field;
/**
* Constructor
*/
public SuperExpression(int where) {
super(SUPER, where, Type.tObject);
}
/**
* Check expression
*/
public long checkValue(Environment env, Context ctx, long vset, Hashtable exp) {
ClassDeclaration superClass = ctx.field.getClassDefinition().getSuperClass();
if (ctx.field.isStatic() || ctx.field.isVariable() || (superClass == null)) {
env.error(where, "undef.var", idSuper);
type = Type.tError;
return vset;
}
if ((vset & 1) == 0) {
env.error(where, "access.inst.before.super", idSuper);
type = Type.tError;
return vset;
}
type = superClass.getType();
field = ctx.getLocalField(idThis);
field.readcount++;
return vset;
}
/**
* Code
*/
public void codeValue(Environment env, Context ctx, Assembler asm) {
asm.add(where, opc_aload, new Integer(field.number));
}
}