Mercurial > hg > truffle
view agent/src/share/classes/sun/jvm/hotspot/utilities/memo/MemoizedFloat.java @ 13705:ac5b0f31f7a2
Truffle API-change: FrameDescriptors are now stored in the RootNode in a final field instead of the CallTarget.
author | Christian Humer <christian.humer@gmail.com> |
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date | Fri, 17 Jan 2014 17:06:08 +0100 |
parents | c18cbe5936b8 |
children |
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/* * Copyright (c) 2000, 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. * * 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.jvm.hotspot.utilities.memo; /** A memoized float. Override {@link #computeValue} in subclasses; call {@link #getValue} in using code. */ public abstract class MemoizedFloat { private boolean computed; private float value; /** Should compute the value of this memoized object. This will only be called once, upon the first call to {@link #getValue}. */ protected abstract float computeValue(); /** Public accessor for the memoized value. */ public float getValue() { if (!computed) { value = computeValue(); computed = true; } return value; } }