test/perf/org/objectweb/asm/test/perf/BCEL.java

/***
 * ASM performance test: measures the performances of asm package
 * Copyright (c) 2002,2003 France Telecom
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.objectweb.asm.test.perf;

import org.apache.bcel.Constants;
import org.apache.bcel.classfile.ClassParser;
import org.apache.bcel.classfile.JavaClass;
import org.apache.bcel.classfile.Method;
import org.apache.bcel.generic.*;

import java.io.InputStream;

/**
 * @author Eric Bruneton
 */

public class BCEL extends ALL implements Constants {

  public static void main (final String args[]) throws Exception {
    System.out.println("BCEL PERFORMANCES\n");
    new BCEL().perfs(args);
  }

  ALL newInstance () {
    return new BCEL();
  }

  byte[] nullAdaptClass (final InputStream is, final String name)
    throws Exception
  {
    JavaClass jc = new ClassParser(is, name + ".class").parse();
    ClassGen cg = new ClassGen(jc);
    ConstantPoolGen cp = cg.getConstantPool();
    Method[] ms = cg.getMethods();
    for (int j = 0; j < ms.length; ++j) {
      MethodGen mg = new MethodGen(ms[j], cg.getClassName(), cp);
      boolean lv = ms[j].getLocalVariableTable() == null;
      boolean ln = ms[j].getLineNumberTable() == null;
      if (lv) {
        mg.removeLocalVariables();
      }
      if (ln) {
        mg.removeLineNumbers();
      }
      mg.stripAttributes(skipDebug);
      InstructionList il = mg.getInstructionList();
      if (il != null) {
        InstructionHandle ih = il.getStart();
        while (ih != null) {
          ih = ih.getNext();
        }
        if (compute) {
          mg.setMaxStack();
          mg.setMaxLocals();
        }
      }
      cg.replaceMethod(ms[j], mg.getMethod());
    }
    return cg.getJavaClass().getBytes();
  }

  byte[] counterAdaptClass (final InputStream is, final String name)
    throws Exception
  {
    JavaClass jc = new ClassParser(is, name + ".class").parse();
    ClassGen cg = new ClassGen(jc);
    ConstantPoolGen cp = cg.getConstantPool();
    if (!cg.isInterface()) {
      FieldGen fg = new FieldGen(ACC_PUBLIC, Type.getType("I"), "_counter", cp);
      cg.addField(fg.getField());
    }
    Method[] ms = cg.getMethods();
    for (int j = 0; j < ms.length; ++j) {
      MethodGen mg = new MethodGen(ms[j], cg.getClassName() ,cp);
      if (!mg.getName().equals("<init>") &&
          !mg.isStatic() && !mg.isAbstract() && !mg.isNative())
      {
        if (mg.getInstructionList() != null) {
          InstructionList il = new InstructionList();
          il.append(new ALOAD(0));
          il.append(new ALOAD(0));
          il.append(new GETFIELD(cp.addFieldref(name, "_counter", "I")));
          il.append(new ICONST(1));
          il.append(new IADD());
          il.append(new PUTFIELD(cp.addFieldref(name, "_counter", "I")));
          mg.getInstructionList().insert(il);
          mg.setMaxStack(Math.max(mg.getMaxStack(), 2));
          boolean lv = ms[j].getLocalVariableTable() == null;
          boolean ln = ms[j].getLineNumberTable() == null;
          if (lv) {
            mg.removeLocalVariables();
          }
          if (ln) {
            mg.removeLineNumbers();
          }
          cg.replaceMethod(ms[j], mg.getMethod());
        }
      }
    }
    return cg.getJavaClass().getBytes();
  }
}