| /* |
| * Copyright 2015 Google Inc. All Rights Reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| import java.io.File; |
| import java.io.FileWriter; |
| import java.io.PrintStream; |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Method; |
| import java.lang.reflect.Type; |
| import java.net.URL; |
| import java.net.URLClassLoader; |
| import java.util.Arrays; |
| import java.util.List; |
| import javax.tools.JavaCompiler; |
| import javax.tools.StandardJavaFileManager; |
| import javax.tools.ToolProvider; |
| |
| /** |
| * A manual benchmark of the JVMTI RedefineClasses when a |
| * single class (and its parent) contains many methods. |
| */ |
| public class ManyMethodsBenchmarkApp { |
| // Limit is 64k but we can not put such many as the CP limit is 32k. |
| // In practice, it means a real limit is much lower (less than 22000). |
| static final int METHOD_COUNT = 20000; |
| |
| static Class<?> loadClassInNewClassLoader(String className) throws Exception { |
| URL[] urls = { new File(".").toURI().toURL() }; |
| URLClassLoader ucl = new URLClassLoader(urls, null); |
| Class<?> klazz = Class.forName(className, true, ucl); |
| return klazz; |
| } |
| |
| static void benchmarkClassOperations(String className) throws Exception { |
| Class<?> klazz = loadClassInNewClassLoader(className); |
| |
| Method[] methods = klazz.getDeclaredMethods(); |
| if (methods.length != METHOD_COUNT) { |
| throw new AssertionError("unexpected method count: " + methods.length + |
| " expected: " + METHOD_COUNT); |
| } |
| |
| methods = klazz.getMethods(); |
| // returned methods includes those inherited from Object |
| int objectMethodSlop = 100; |
| if (methods.length <= METHOD_COUNT || |
| methods.length >= METHOD_COUNT + objectMethodSlop) { |
| throw new AssertionError("unexpected method count: " + methods.length); |
| } |
| |
| // Invoke methods to make them appear in the constant pool cache |
| Object obj = klazz.newInstance(); |
| Object[] args = new Object[0]; |
| for (Method m: methods) { |
| try { |
| Class<?>[] types = m.getParameterTypes(); |
| String name = m.getName(); |
| // System.out.println("method: " + name + "; argno: " + types.length); |
| if (types.length == 0 && name.length() == 2 && name.startsWith("f")) { |
| m.invoke(obj, args); |
| } |
| } catch (InvocationTargetException ex) { |
| ex.printStackTrace(); |
| } |
| } |
| } |
| |
| public static void main(String[] args) throws Exception { |
| System.out.println("test started: ManyMethodsBenchmarkApp"); |
| |
| // Create source files with many methods |
| File base = new File("Base.java"); |
| try (FileWriter fw = new FileWriter(base)) { |
| fw.write("public class Base {\n"); |
| final int L = 10; |
| // Each of the first L methods makes calls to its own chunk of METHOD_COUNT/L methods |
| for (int k = 0; k < L; k++) { |
| fw.write(" public void f" + k + "() {\n"); |
| int shift = (k == 0) ? L : 0; |
| for (int i = (k * (METHOD_COUNT/L)) + shift; i < (k + 1) * METHOD_COUNT/L; i++) { |
| fw.write(" f" + i + "();\n"); |
| } |
| fw.write(" }\n"); |
| } |
| |
| // The rest of (METHOD_COUNT - L) methods have empty body |
| for (int i = L; i < METHOD_COUNT; i++) { |
| fw.write(" public static void f" + i + "() {}\n"); |
| } |
| fw.write("}\n"); |
| } |
| |
| // Compile the generated source files. |
| JavaCompiler compiler = ToolProvider.getSystemJavaCompiler(); |
| List<File> files = Arrays.asList(new File[] { base }); |
| try (StandardJavaFileManager fileManager = |
| compiler.getStandardFileManager(null, null, null)) { |
| compiler.getTask(null, fileManager, null, null, null, |
| fileManager.getJavaFileObjectsFromFiles(files)) |
| .call(); |
| } |
| |
| benchmarkClassOperations("Base"); |
| |
| ManyMethodsBenchmarkAgent.instr(); |
| |
| // Cleanup |
| base.delete(); |
| new File("Base.class").delete(); |
| if (!ManyMethodsBenchmarkAgent.completed) { |
| throw new Exception("ERROR: ManyMethodsBenchmarkAgent did not complete."); |
| } |
| |
| if (ManyMethodsBenchmarkAgent.fail) { |
| throw new Exception("ERROR: ManyMethodsBenchmarkAgent failed."); |
| } else { |
| System.out.println("ManyMethodsBenchmarkAgent succeeded."); |
| } |
| System.out.println("test finished: ManyMethodsBenchmarkApp"); |
| } |
| } |