mirror of
https://github.com/openjdk/jdk.git
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116 lines
4.2 KiB
Java
116 lines
4.2 KiB
Java
/*
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* Copyright (c) 2025, 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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package org.openjdk.bench.java.lang;
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import org.openjdk.jmh.annotations.Benchmark;
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import org.openjdk.jmh.annotations.BenchmarkMode;
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import org.openjdk.jmh.annotations.Fork;
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import org.openjdk.jmh.annotations.Level;
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import org.openjdk.jmh.annotations.Measurement;
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import org.openjdk.jmh.annotations.Mode;
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import org.openjdk.jmh.annotations.OutputTimeUnit;
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import org.openjdk.jmh.annotations.Scope;
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import org.openjdk.jmh.annotations.Setup;
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import org.openjdk.jmh.annotations.State;
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import org.openjdk.jmh.annotations.Warmup;
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import org.openjdk.jmh.infra.Blackhole;
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import java.lang.foreign.Arena;
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import java.nio.ByteBuffer;
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import java.util.concurrent.TimeUnit;
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import java.util.HexFormat;
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/**
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* Tests java.lang.ClassLoader.defineClass(ByteBuffer)
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*/
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@BenchmarkMode(Mode.AverageTime)
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@OutputTimeUnit(TimeUnit.NANOSECONDS)
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@State(Scope.Thread)
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@Warmup(iterations = 5, time = 1)
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@Measurement(iterations = 5, time = 1)
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@Fork(3)
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public class ClassLoaderDefineClass {
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private byte[] classBytes;
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private ByteBuffer directBuffer;
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private ByteBuffer heapBuffer;
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@Setup(Level.Iteration)
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public void setup() throws Exception {
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classBytes = getTestClassBytes();
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directBuffer = Arena.ofConfined()
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.allocate(classBytes.length)
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.asByteBuffer()
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.put(classBytes)
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.flip();
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heapBuffer = ByteBuffer.wrap(classBytes);
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}
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@Benchmark
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public void testDefineClassByteBufferHeap(Blackhole bh) throws Exception {
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bh.consume(new DummyClassLoader().defineClassFromHeapBuffer(heapBuffer));
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}
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@Benchmark
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public void testDefineClassByteBufferDirect(Blackhole bh) throws Exception {
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bh.consume(new DummyClassLoader().defineClassFromDirectBuffer(directBuffer));
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}
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private static final class DummyClassLoader extends ClassLoader {
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Class<?> defineClassFromHeapBuffer(ByteBuffer bb) throws Exception {
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bb.rewind();
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return defineClass(null, bb, null);
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}
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Class<?> defineClassFromDirectBuffer(ByteBuffer bb) throws Exception {
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bb.rewind();
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return defineClass(null, bb, null);
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}
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}
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private static byte[] getTestClassBytes() throws Exception {
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final String source = """
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public class Greeting {
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public String hello() {
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return "Hello";
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}
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}
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""";
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// (externally) compiled content of the above source, represented as hex
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final String classBytesHex = """
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cafebabe0000004600110a000200030700040c000500060100106a617661
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2f6c616e672f4f626a6563740100063c696e69743e010003282956080008
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01000548656c6c6f07000a0100084772656574696e67010004436f646501
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000f4c696e654e756d6265725461626c6501000568656c6c6f0100142829
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4c6a6176612f6c616e672f537472696e673b01000a536f7572636546696c
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6501000d4772656574696e672e6a61766100210009000200000000000200
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01000500060001000b0000001d00010001000000052ab70001b100000001
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000c000000060001000000010001000d000e0001000b0000001b00010001
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000000031207b000000001000c000000060001000000030001000f000000
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020010
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""";
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return HexFormat.of().parseHex(classBytesHex.replaceAll("\n", ""));
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}
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}
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