Mercurial > hg > truffle
view graal/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/CyclicAssumption.java @ 16747:d9d496d77d37
Truffle: Added option to query a BranchProfile for visited.
author | Christian Humer <christian.humer@gmail.com> |
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date | Mon, 11 Aug 2014 15:53:04 +0200 |
parents | f28ea693056f |
children | dc7189b2bb5f |
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/* * 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.*; /** * Holds an {@link Assumption}, and knows how to recreate it with the same properties on * invalidation. Used so that mutability is isolated in this class, and all other classes that need * an assumption that may be recreated can have a final reference to an object of this class. Note * that you should be careful that repeated invalidations do not cause a deoptimization loop in that * same way that you would with any other assumption. */ public class CyclicAssumption { private final String name; private Assumption assumption; public CyclicAssumption(String name) { this.name = name; invalidate(); } public void invalidate() { if (assumption != null) { assumption.invalidate(); } assumption = Truffle.getRuntime().createAssumption(name); } public Assumption getAssumption() { return assumption; } }