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comparison test/compiler/stable/StableConfiguration.java @ 18004:ee1c924763d2

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8043546: C1 optimizes @Stable instance fields with default values Reviewed-by: kvn, jrose
author vlivanov
date Thu, 10 Jul 2014 12:04:43 -0700
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18003:dda2ae6f9557 18004:ee1c924763d2
1 /*
2 * Copyright (c) 2014, 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 java.lang.invoke;
26
27 import java.lang.reflect.Method;
28 import java.util.Properties;
29 import sun.hotspot.WhiteBox;
30
31 public class StableConfiguration {
32 static final WhiteBox WB = WhiteBox.getWhiteBox();
33 static final boolean isStableEnabled;
34 static final boolean isServerWithStable;
35
36 static {
37 Boolean value = WB.getBooleanVMFlag("FoldStableValues");
38 isStableEnabled = (value == null ? false : value);
39 isServerWithStable = isStableEnabled && get();
40 System.out.println("@Stable: " + (isStableEnabled ? "enabled" : "disabled"));
41 System.out.println("Server Compiler: " + get());
42 }
43
44 // ::get() is among immediately compiled methods.
45 static boolean get() {
46 try {
47 Method m = StableConfiguration.class.getDeclaredMethod("get");
48 int level = WB.getMethodCompilationLevel(m);
49 if (level > 0) {
50 return (level == 4);
51 } else {
52 String javaVM = System.getProperty("java.vm.name", "");
53 if (javaVM.contains("Server")) return true;
54 if (javaVM.contains("Client")) return false;
55 throw new Error("Unknown VM type: "+javaVM);
56 }
57 } catch (NoSuchMethodException e) {
58 throw new Error(e);
59 }
60 }
61
62 }