70 lines
2.7 KiB
Java
70 lines
2.7 KiB
Java
/*
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* Copyright (c) 2024, Alibaba Group Holding Limited. 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.
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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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import java.lang.StringBuilder;
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import java.lang.invoke.*;
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import java.lang.management.ManagementFactory;
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/**
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* @test
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* @summary Test whether the hidden class unloading of StringConcatFactory works
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*
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* @requires vm.flagless
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* @run main/othervm -Xmx8M -Xms8M -Xverify:all HiddenClassUnloading
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* @run main/othervm -Xmx8M -Xms8M -Xverify:all -XX:-CompactStrings HiddenClassUnloading
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*/
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public class HiddenClassUnloading {
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public static void main(String[] args) throws Throwable {
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var lookup = MethodHandles.lookup();
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var types = new Class<?>[] {
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int.class, long.class, double.class, float.class, char.class, boolean.class, String.class,
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};
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long initUnloadedClassCount = ManagementFactory.getClassLoadingMXBean().getUnloadedClassCount();
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for (int i = 0; i < 12000; i++) {
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int radix = types.length;
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String str = Integer.toString(i, radix);
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int length = str.length();
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var ptypes = new Class[length];
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for (int j = 0; j < length; j++) {
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int index = Integer.parseInt(str.substring(j, j + 1), radix);
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ptypes[j] = types[index];
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}
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StringConcatFactory.makeConcatWithConstants(
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lookup,
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"concat",
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MethodType.methodType(String.class, ptypes),
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"\1".repeat(length), // recipe
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new Object[0]
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);
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}
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long unloadedClassCount = ManagementFactory.getClassLoadingMXBean().getUnloadedClassCount();
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if (initUnloadedClassCount == unloadedClassCount) {
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throw new RuntimeException("unloadedClassCount is zero");
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}
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}
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}
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