146 lines
4.9 KiB
Java
146 lines
4.9 KiB
Java
/*
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* Copyright (c) 2024, 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.javax.tools;
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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.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.TearDown;
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import org.openjdk.jmh.annotations.Warmup;
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import javax.tools.JavaCompiler;
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import javax.tools.SimpleJavaFileObject;
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import javax.tools.StandardJavaFileManager;
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import javax.tools.StandardLocation;
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import javax.tools.ToolProvider;
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import java.io.IOException;
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import java.io.File;
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import java.net.URI;
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import java.nio.file.Files;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.List;
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import java.util.concurrent.TimeUnit;
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@BenchmarkMode(Mode.AverageTime)
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@OutputTimeUnit(TimeUnit.MILLISECONDS)
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@State(Scope.Thread)
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@Warmup(iterations = 5, time = 3, timeUnit = TimeUnit.SECONDS)
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@Measurement(iterations = 5, time = 5, timeUnit = TimeUnit.SECONDS)
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@Fork(value = 2, jvmArgs = "-Xmx1g")
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public class JavacNameTable {
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private List<JavaSourceFromString> compilationUnits;
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private JavaCompiler compiler;
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private StandardJavaFileManager fileManager;
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private File classDir;
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@Setup
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public void prepare() throws IOException {
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// Create a source file with lots of names
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StringBuilder buf = new StringBuilder();
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buf.append("class BigSource {\n");
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for (int i = 0; i < 20000; i++) {
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buf.append(String.format(
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//"final String name%05d = \"some text #%5d\";\n", i, i));
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"String name%05d;\n", i, i));
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}
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buf.append("}\n");
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String bigSource = buf.toString();
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compiler = ToolProvider.getSystemJavaCompiler();
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fileManager = compiler.getStandardFileManager(null, null, null);
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classDir = Files.createTempDirectory(
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JavacNameTable.class.getName()).toFile();
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fileManager.setLocation(StandardLocation.CLASS_OUTPUT,
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Collections.singleton(classDir));
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compilationUnits = new ArrayList<>();
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compilationUnits.add(new JavaSourceFromString("BigSource", bigSource));
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}
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@TearDown
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public void tearDown() {
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for (File f : classDir.listFiles()) {
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if (f.isFile()) {
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f.delete();
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} else {
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throw new IllegalStateException("Unexpected non-file: " + f);
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}
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}
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classDir.delete();
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}
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@Benchmark
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public Boolean testSharedTable() throws Exception {
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return testCompile(null);
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}
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@Benchmark
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public Boolean testUnsharedTable() throws Exception {
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return testCompile("-XDuseUnsharedTable=true");
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}
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@Benchmark
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public Boolean testStringTable() throws Exception {
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return testCompile("-XDuseStringTable=true");
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}
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@Benchmark
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public Boolean testInternStringTable() throws Exception {
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return testCompile("-XDinternStringTable=true");
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}
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public Boolean testCompile(String flag) throws Exception {
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final List<String> options = flag != null ?
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Collections.singletonList(flag) : null;
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JavaCompiler.CompilationTask task = compiler.getTask(null, fileManager,
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null, options, null, compilationUnits);
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return task.call();
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}
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private static class JavaSourceFromString extends SimpleJavaFileObject {
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private final String code;
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JavaSourceFromString(String name, String code) {
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super(URI.create("string:///"
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+ name.replace('.', '/') + Kind.SOURCE.extension), Kind.SOURCE);
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this.code = code;
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}
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@Override
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public CharSequence getCharContent(boolean ignoreEncodingErrors) {
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return code;
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}
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}
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}
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