Mercurial > hg > truffle
diff truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/BranchProfile.java @ 21951:9c8c0937da41
Moving all sources into truffle subdirectory
author | Jaroslav Tulach <jaroslav.tulach@oracle.com> |
---|---|
date | Wed, 17 Jun 2015 10:58:08 +0200 |
parents | graal/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/BranchProfile.java@62aac33db669 |
children | dc83cc1f94f2 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/BranchProfile.java Wed Jun 17 10:58:08 2015 +0200 @@ -0,0 +1,66 @@ +/* + * 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()); + } +}