3789983e89
Reviewed-by: darcy, ihse
142 lines
5.5 KiB
Java
142 lines
5.5 KiB
Java
/*
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* Copyright 2015 Google Inc. 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.io.File;
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import java.io.FileWriter;
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import java.io.PrintStream;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.lang.reflect.Type;
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import java.net.URL;
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import java.net.URLClassLoader;
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import java.util.Arrays;
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import java.util.List;
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import javax.tools.JavaCompiler;
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import javax.tools.StandardJavaFileManager;
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import javax.tools.ToolProvider;
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/**
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* A manual benchmark of the JVMTI RedefineClasses when a
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* single class (and its parent) contains many methods.
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*/
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public class ManyMethodsBenchmarkApp {
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// Limit is 64k but we can not put such many as the CP limit is 32k.
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// In practice, it means a real limit is much lower (less than 22000).
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static final int METHOD_COUNT = 20000;
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static Class<?> loadClassInNewClassLoader(String className) throws Exception {
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URL[] urls = { new File(".").toURI().toURL() };
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URLClassLoader ucl = new URLClassLoader(urls, null);
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Class<?> klazz = Class.forName(className, true, ucl);
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return klazz;
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}
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static void benchmarkClassOperations(String className) throws Exception {
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Class<?> klazz = loadClassInNewClassLoader(className);
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Method[] methods = klazz.getDeclaredMethods();
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if (methods.length != METHOD_COUNT) {
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throw new AssertionError("unexpected method count: " + methods.length +
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" expected: " + METHOD_COUNT);
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}
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methods = klazz.getMethods();
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// returned methods includes those inherited from Object
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int objectMethodSlop = 100;
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if (methods.length <= METHOD_COUNT ||
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methods.length >= METHOD_COUNT + objectMethodSlop) {
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throw new AssertionError("unexpected method count: " + methods.length);
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}
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// Invoke methods to make them appear in the constant pool cache
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Object obj = klazz.newInstance();
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Object[] args = new Object[0];
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for (Method m: methods) {
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try {
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Class<?>[] types = m.getParameterTypes();
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String name = m.getName();
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// System.out.println("method: " + name + "; argno: " + types.length);
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if (types.length == 0 && name.length() == 2 && name.startsWith("f")) {
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m.invoke(obj, args);
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}
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} catch (InvocationTargetException ex) {
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ex.printStackTrace();
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}
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}
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}
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public static void main(String[] args) throws Exception {
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System.out.println("test started: ManyMethodsBenchmarkApp");
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// Create source files with many methods
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File base = new File("Base.java");
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try (FileWriter fw = new FileWriter(base)) {
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fw.write("public class Base {\n");
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final int L = 10;
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// Each of the first L methods makes calls to its own chunk of METHOD_COUNT/L methods
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for (int k = 0; k < L; k++) {
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fw.write(" public void f" + k + "() {\n");
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int shift = (k == 0) ? L : 0;
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for (int i = (k * (METHOD_COUNT/L)) + shift; i < (k + 1) * METHOD_COUNT/L; i++) {
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fw.write(" f" + i + "();\n");
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}
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fw.write(" }\n");
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}
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// The rest of (METHOD_COUNT - L) methods have empty body
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for (int i = L; i < METHOD_COUNT; i++) {
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fw.write(" public static void f" + i + "() {}\n");
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}
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fw.write("}\n");
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}
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// Compile the generated source files.
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JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
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List<File> files = Arrays.asList(new File[] { base });
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try (StandardJavaFileManager fileManager =
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compiler.getStandardFileManager(null, null, null)) {
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compiler.getTask(null, fileManager, null, null, null,
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fileManager.getJavaFileObjectsFromFiles(files))
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.call();
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}
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benchmarkClassOperations("Base");
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ManyMethodsBenchmarkAgent.instr();
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// Cleanup
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base.delete();
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new File("Base.class").delete();
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if (!ManyMethodsBenchmarkAgent.completed) {
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throw new Exception("ERROR: ManyMethodsBenchmarkAgent did not complete.");
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}
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if (ManyMethodsBenchmarkAgent.fail) {
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throw new Exception("ERROR: ManyMethodsBenchmarkAgent failed.");
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} else {
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System.out.println("ManyMethodsBenchmarkAgent succeeded.");
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}
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System.out.println("test finished: ManyMethodsBenchmarkApp");
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}
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}
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