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68 lines
2.6 KiB
Java
68 lines
2.6 KiB
Java
/*
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* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @summary tests on constant folding of unsafe get operations
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* @library /testlibrary /test/lib
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*
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* @run main/bootclasspath -XX:+UnlockDiagnosticVMOptions
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* -Xbatch -XX:-TieredCompilation
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* -XX:+FoldStableValues
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* UnsafeGetStableArrayElement
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*
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* @run main/bootclasspath -XX:+UnlockDiagnosticVMOptions
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* -Xbatch -XX:+TieredCompilation -XX:TieredStopAtLevel=1
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* -XX:+FoldStableValues
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* UnsafeGetStableArrayElement
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*/
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import jdk.internal.misc.Unsafe;
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import jdk.internal.vm.annotation.Stable;
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import java.util.concurrent.Callable;
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import static jdk.internal.misc.Unsafe.*;
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import static jdk.test.lib.Asserts.*;
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public class UnsafeGetStableArrayElement {
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@Stable static final byte[] STABLE_BYTE_ARRAY = new byte[] { 0, 1, -128, 127};
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static final Unsafe U = Unsafe.getUnsafe();
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static int testChar() {
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return U.getChar(STABLE_BYTE_ARRAY, ARRAY_BYTE_BASE_OFFSET + 0 * ARRAY_CHAR_INDEX_SCALE) +
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U.getChar(STABLE_BYTE_ARRAY, ARRAY_BYTE_BASE_OFFSET + 1 * ARRAY_CHAR_INDEX_SCALE);
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}
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static void run(Callable c) throws Exception {
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Object first = c.call();
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for (int i = 0; i < 20_000; i++) {
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assertEQ(first, c.call());
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}
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}
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public static void main(String[] args) throws Exception {
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run(UnsafeGetStableArrayElement::testChar);
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}
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}
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