Mercurial > hg > graal-jvmci-8
view graal/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/BranchProfile.java @ 21554:b1530a6cce8c
renamed com.oracle.graal.[debug|options|hotspotvmconfig]* modules to com.oracle.jvmci.[debug|options|hotspotvmconfig]* modules (JBS:GRAAL-53)
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 26 May 2015 23:21:15 +0200 |
parents | 62aac33db669 |
children |
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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.*; import com.oracle.truffle.api.CompilerDirectives.CompilationFinal; import com.oracle.truffle.api.nodes.*; /** * Utility class to speculate on branches to be never visited. If the {@link #enter()} method is * invoked first the optimized code is invalidated and the branch where {@link #enter()} is invoked * is enabled for compilation. Otherwise if the {@link #enter()} method was never invoked the branch * will not get compiled. * * All {@code BranchProfile} instances must be held in {@code final} fields for compiler * optimizations to take effect. */ public final class BranchProfile extends NodeCloneable { @CompilationFinal private boolean visited; private BranchProfile() { } public void enter() { if (!visited) { CompilerDirectives.transferToInterpreterAndInvalidate(); visited = true; } } public boolean isVisited() { return visited; } public static BranchProfile create() { return new BranchProfile(); } @Override public String toString() { return String.format("%s(%s)@%x", getClass().getSimpleName(), visited ? "visited" : "not-visited", hashCode()); } }