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comparison graal/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/BranchProfile.java @ 13335:8531c47138dc

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Truffle: introduced new profiling utility BranchProfile.
author Christian Humer <christian.humer@gmail.com>
date Sun, 15 Dec 2013 22:19:19 +0100
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children a0200c215fb2 64dcb92ee75a
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13334:39694f3b0ed9 13335:8531c47138dc
1 /*
2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25 package com.oracle.truffle.api.utilities;
26
27 import com.oracle.truffle.api.*;
28 import com.oracle.truffle.api.CompilerDirectives.*;
29
30 /**
31 * Utility class to speculate on branches to be never visited. If the {@link #enter()} method is
32 * invoked first the optimized code is invalidated and the branch where {@link #enter()} is invoked
33 * is enabled for compilation. Otherwise if the {@link #enter()} method was never invoked the branch
34 * will not get compiled.
35 */
36 public final class BranchProfile {
37
38 @CompilationFinal private boolean visited;
39
40 public void enter() {
41 if (!visited) {
42 CompilerDirectives.transferToInterpreterAndInvalidate();
43 visited = true;
44 }
45 }
46
47 }