Mercurial > hg > truffle
comparison test/compiler/stable/StableConfiguration.java @ 18004:ee1c924763d2
8043546: C1 optimizes @Stable instance fields with default values
Reviewed-by: kvn, jrose
author | vlivanov |
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date | Thu, 10 Jul 2014 12:04:43 -0700 |
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18003:dda2ae6f9557 | 18004:ee1c924763d2 |
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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 } |