107 lines
4.7 KiB
Java
107 lines
4.7 KiB
Java
/*
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* Copyright (c) 2020, 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.
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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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* @bug 8249719
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* @summary ResolvedMethodTable hash function should take method class into account
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* @run main/othervm/manual -Xmx256m -XX:MaxMetaspaceSize=256m ResolvedMethodTableHash 200000
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*/
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import java.lang.invoke.MethodHandle;
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import java.lang.invoke.MethodHandles;
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import java.lang.invoke.MethodType;
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import java.nio.ByteBuffer;
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import java.util.ArrayList;
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import java.util.List;
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// The test generates thousands MethodHandles to the methods of the same name
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// and the same signature. This should not take too long, unless Method hash
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// function takes only the name and the signature as an input.
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public class ResolvedMethodTableHash extends ClassLoader {
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// Generate a MethodHandle for ClassName.m()
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private MethodHandle generate(String className) throws ReflectiveOperationException {
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byte[] buf = new byte[100];
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int size = writeClass(buf, className);
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Class<?> cls = defineClass(null, buf, 0, size);
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return MethodHandles.publicLookup().findStatic(cls, "m", MethodType.methodType(void.class));
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}
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private MethodHandle generateWithSameName() throws ReflectiveOperationException {
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byte[] buf = new byte[100];
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int size = writeClass(buf, "MH$$");
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// use different classloader instances to load the classes with the same name
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Class<?> cls = new ResolvedMethodTableHash().defineClass(null, buf, 0, size);
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return MethodHandles.publicLookup().findStatic(cls, "m", MethodType.methodType(void.class));
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}
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// Produce a class file with the given name and a single method:
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// public static native void m();
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private int writeClass(byte[] buf, String className) {
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return ByteBuffer.wrap(buf)
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.putInt(0xCAFEBABE) // magic
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.putInt(50) // version: 50
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.putShort((short) 7) // constant_pool_count: 7
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.put((byte) 7).putShort((short) 2)
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.put((byte) 1).putShort((short) className.length()).put(className.getBytes())
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.put((byte) 7).putShort((short) 4)
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.put((byte) 1).putShort((short) 16).put("java/lang/Object".getBytes())
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.put((byte) 1).putShort((short) 1).put("m".getBytes())
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.put((byte) 1).putShort((short) 3).put("()V".getBytes())
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.putShort((short) 0x21) // access_flags: public super
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.putShort((short) 1) // this_class: #1
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.putShort((short) 3) // super_class: #3
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.putShort((short) 0) // interfaces_count: 0
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.putShort((short) 0) // fields_count: 0
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.putShort((short) 1) // methods_count: 1
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.putShort((short) 0x109) // access_flags: public static native
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.putShort((short) 5) // name_index: #5
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.putShort((short) 6) // descriptor_index: #6
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.putShort((short) 0) // attributes_count: 0
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.putShort((short) 0) // attributes_count: 0
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.position();
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}
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public static void main(String[] args) throws Exception {
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ResolvedMethodTableHash generator = new ResolvedMethodTableHash();
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List<MethodHandle> handles = new ArrayList<>();
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int count = args.length > 0 ? Integer.parseInt(args[0]) : 200000;
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for (int i = 0; i < count; i++) {
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// prevents metaspace oom
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if (i % 20 != 0) {
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handles.add(generator.generate("MH$" + i));
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} else {
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handles.add(generator.generateWithSameName());
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}
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if (i % 1000 == 0) {
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System.out.println("Generated " + i + " handles");
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}
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}
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System.out.println("Test passed");
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}
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}
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