Mercurial > hg > truffle
diff graal/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/NeverValidAssumption.java @ 17057:d51c097cca37
Truffle: Add NeverValidAssumption.
author | Chris Seaton <chris.seaton@oracle.com> |
---|---|
date | Sat, 06 Sep 2014 17:19:13 +0100 |
parents | |
children | e9c8742148c1 |
line wrap: on
line diff
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/NeverValidAssumption.java Sat Sep 06 17:19:13 2014 +0100 @@ -0,0 +1,61 @@ +/* + * Copyright (c) 2013, 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 com.oracle.truffle.api.utilities; + +import com.oracle.truffle.api.*; +import com.oracle.truffle.api.nodes.*; + +/** + * An assumption that is never valid. Used as a placeholder where an assumption is needed that + * should be invalid from the start. + */ +public final class NeverValidAssumption implements Assumption { + + public static final NeverValidAssumption INSTANCE = new NeverValidAssumption(); + + private NeverValidAssumption() { + } + + @Override + public void check() throws InvalidAssumptionException { + throw new InvalidAssumptionException(); + } + + @Override + public void invalidate() { + throw new UnsupportedOperationException("Cannot invalidate this assumption - it is never valid"); + } + + @Override + public String getName() { + return getClass().getName(); + } + + @Override + public boolean isValid() { + return false; + } + +}