jdk8-mips64-public/hotspot: test/runtime/6925573/SortMethodsTest.java@6cbff0651f1a (annotated)

test/runtime/6925573/SortMethodsTest.java@6cbff0651f1a (annotated)

test/runtime/6925573/SortMethodsTest.java

Mon, 06 Nov 2017 16:51:47 +0800

author: aoqi
date: Mon, 06 Nov 2017 16:51:47 +0800
changeset 7997: 6cbff0651f1a
parent 6876: 710a3c8b516e
permissions: -rw-r--r--

[Code Reorganization] remove trailing whitespace to pass jcheck test

 /*
  * Copyright (c) 2008, 2010, Oracle and/or its affiliates. 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.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.OutputStream;
 import java.io.PrintWriter;
 import java.io.StringWriter;
 import java.lang.reflect.Method;
 import java.net.URI;
 import java.util.Arrays;
 import java.util.Vector;
 import javax.tools.Diagnostic;
 import javax.tools.DiagnosticCollector;
 import javax.tools.FileObject;
 import javax.tools.ForwardingJavaFileManager;
 import javax.tools.JavaCompiler;
 import javax.tools.JavaCompiler.CompilationTask;
 import javax.tools.JavaFileManager;
 import javax.tools.JavaFileObject;
 import javax.tools.JavaFileObject.Kind;
 import javax.tools.SimpleJavaFileObject;
 import javax.tools.StandardJavaFileManager;
 import javax.tools.ToolProvider;
 /*
  * @test SortMethodsTest
  * @bug 6925573
  * @summary verify that class loading does not need quadratic time with regard to the number of class
 methods.
  * @run main SortMethodsTest
  * @author volker.simonis@gmail.com
 */
 public class SortMethodsTest {
   static String createClass(String name, int nrOfMethods) {
     StringWriter sw = new StringWriter();
     PrintWriter pw = new PrintWriter(sw);
     pw.println("public class " + name + "{");
     for (int i = 0; i < nrOfMethods; i++) {
       pw.println("  public void m" + i + "() {}");
     }
     pw.println("  public static String sayHello() {");
     pw.println("    return \"Hello from class \" + " + name +
                ".class.getName() + \" with \" + " + name +
                ".class.getDeclaredMethods().length + \" methods\";");
     pw.println("  }");
     pw.println("}");
     pw.close();
     return sw.toString();
   }
   public static void main(String args[]) {
     JavaCompiler comp = ToolProvider.getSystemJavaCompiler();
     DiagnosticCollector<JavaFileObject> diags = new DiagnosticCollector<JavaFileObject>();
     final String cName = new String("ManyMethodsClass");
     Vector<Long> results = new Vector<Long>();
     for (int i = 6; i < 600000; i*=10) {
       String klass =  createClass(cName, i);
       JavaMemoryFileObject file = new JavaMemoryFileObject(cName, klass);
       MemoryFileManager mfm = new MemoryFileManager(comp.getStandardFileManager(diags, null, null), file);
       CompilationTask task = comp.getTask(null, mfm, diags, null, null, Arrays.asList(file));
       if (task.call()) {
         try {
           MemoryClassLoader mcl = new MemoryClassLoader(file);
           long start = System.nanoTime();
           Class<? extends Object> c = Class.forName(cName, true, mcl);
           long end = System.nanoTime();
           results.add(end - start);
           Method m = c.getDeclaredMethod("sayHello", new Class[0]);
           String ret = (String)m.invoke(null, new Object[0]);
           System.out.println(ret + " (loaded and resloved in " + (end - start) + "ns)");
         } catch (Exception e) {
           System.err.println(e);
         }
       }
       else {
         System.out.println(klass);
         System.out.println();
         for (Diagnostic diag : diags.getDiagnostics()) {
           System.out.println(diag.getCode() + "\n" + diag.getKind() + "\n" + diag.getPosition());
           System.out.println(diag.getSource() + "\n" + diag.getMessage(null));
         }
       }
     }
     long lastRatio = 0;
     for (int i = 2; i < results.size(); i++) {
       long normalized1 = Math.max(results.get(i-1) - results.get(0), 1);
       long normalized2 = Math.max(results.get(i) - results.get(0), 1);
       long ratio = normalized2/normalized1;
       lastRatio = ratio;
       System.out.println("10 x more methods requires " + ratio + " x more time");
     }
     // The following is just vague estimation but seems to work on current x86_64 and sparcv9 machines
     if (lastRatio > 80) {
       throw new RuntimeException("ATTENTION: it seems that class loading needs quadratic time with regard to the number of class methods!!!");
     }
   }
 }
 class JavaMemoryFileObject extends SimpleJavaFileObject {
   private final String code;
   private ByteArrayOutputStream byteCode;
   JavaMemoryFileObject(String name, String code) {
     super(URI.create("string:///" + name.replace('.','/') + Kind.SOURCE.extension), Kind.SOURCE);
     this.code = code;
   }
   @Override
   public CharSequence getCharContent(boolean ignoreEncodingErrors) {
     return code;
   }
   @Override
   public OutputStream openOutputStream() {
     byteCode = new ByteArrayOutputStream();
     return byteCode;
   }
   byte[] getByteCode() {
     return byteCode.toByteArray();
    }
 }
 class MemoryClassLoader extends ClassLoader {
   private final JavaMemoryFileObject jfo;
   public MemoryClassLoader(JavaMemoryFileObject jfo) {
     this.jfo = jfo;
   }
   public Class findClass(String name) {
     byte[] b = jfo.getByteCode();
     return defineClass(name, b, 0, b.length);
   }
 }
 class MemoryFileManager extends ForwardingJavaFileManager<JavaFileManager> {
   private final JavaFileObject jfo;
   public MemoryFileManager(StandardJavaFileManager jfm, JavaFileObject jfo) {
     super(jfm);
     this.jfo = jfo;
   }
   @Override
   public FileObject getFileForInput(Location location, String packageName,
                                     String relativeName) throws IOException {
     return jfo;
   }
   @Override
   public JavaFileObject getJavaFileForOutput(Location location, String qualifiedName,
                                              Kind kind, FileObject outputFile) throws IOException {
     return jfo;
   }
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

test/runtime/6925573/SortMethodsTest.java@6cbff0651f1a (annotated)

test/runtime/6925573/SortMethodsTest.java