/*
* Copyright (c) 1994, 2003, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.tools.tree;
import sun.tools.java.*;
import sun.tools.asm.Assembler;
import sun.tools.asm.Label;
import java.io.PrintStream;
import java.util.Hashtable;
/**
* WARNING: The contents of this source file are not part of any
* supported API. Code that depends on them does so at its own risk:
* they are subject to change or removal without notice.
*/
public
class BooleanExpression extends ConstantExpression {
boolean value;
/**
* Constructor
*/
public BooleanExpression(long where, boolean value) {
super(BOOLEANVAL, where, Type.tBoolean);
this.value = value;
}
/**
* Get the value
*/
public Object getValue() {
return value ? 1 : 0;
}
/**
* Check if the expression is equal to a value
*/
public boolean equals(boolean b) {
return value == b;
}
/**
* Check if the expression is equal to its default static value
*/
public boolean equalsDefault() {
return !value;
}
/*
* Check a "not" expression.
*
* cvars is modified so that
* cvar.vsTrue indicates variables with a known value if
* the expression is true.
* cvars.vsFalse indicates variables with a known value if
* the expression is false
*
* For constant expressions, set the side that corresponds to our
* already known value to vset. Set the side that corresponds to the
* other way to "impossible"
*/
public void checkCondition(Environment env, Context ctx,
Vset vset, Hashtable<Object, Object> exp, ConditionVars cvars) {
if (value) {
cvars.vsFalse = Vset.DEAD_END;
cvars.vsTrue = vset;
} else {
cvars.vsFalse = vset;
cvars.vsTrue = Vset.DEAD_END;
}
}
/**
* Code
*/
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