Mercurial > hg > truffle
diff 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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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/test/compiler/stable/StableConfiguration.java Thu Jul 10 12:04:43 2014 -0700 @@ -0,0 +1,62 @@ +/* + * Copyright (c) 2014, 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 java.lang.invoke; + +import java.lang.reflect.Method; +import java.util.Properties; +import sun.hotspot.WhiteBox; + +public class StableConfiguration { + static final WhiteBox WB = WhiteBox.getWhiteBox(); + static final boolean isStableEnabled; + static final boolean isServerWithStable; + + static { + Boolean value = WB.getBooleanVMFlag("FoldStableValues"); + isStableEnabled = (value == null ? false : value); + isServerWithStable = isStableEnabled && get(); + System.out.println("@Stable: " + (isStableEnabled ? "enabled" : "disabled")); + System.out.println("Server Compiler: " + get()); + } + + // ::get() is among immediately compiled methods. + static boolean get() { + try { + Method m = StableConfiguration.class.getDeclaredMethod("get"); + int level = WB.getMethodCompilationLevel(m); + if (level > 0) { + return (level == 4); + } else { + String javaVM = System.getProperty("java.vm.name", ""); + if (javaVM.contains("Server")) return true; + if (javaVM.contains("Client")) return false; + throw new Error("Unknown VM type: "+javaVM); + } + } catch (NoSuchMethodException e) { + throw new Error(e); + } + } + +}