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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.bcel;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.util.concurrent.TimeUnit;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import org.apache.bcel.classfile.ClassParser;
import org.apache.bcel.classfile.JavaClass;
import org.apache.bcel.classfile.Method;
import org.apache.bcel.generic.ClassGen;
import org.apache.bcel.generic.InstructionList;
import org.apache.bcel.generic.MethodGen;
import org.apache.commons.collections4.Predicate;
import org.apache.commons.collections4.iterators.EnumerationIterator;
import org.apache.commons.collections4.iterators.FilterIterator;
import org.apache.commons.collections4.iterators.IteratorIterable;
import org.apache.commons.io.IOUtils;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Measurement;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Threads;
import org.openjdk.jmh.annotations.Warmup;
import org.openjdk.jmh.infra.Blackhole;
@BenchmarkMode(Mode.AverageTime)
@Fork(value = 1, jvmArgs = "-server")
@Threads(1)
@Warmup(iterations = 10)
@Measurement(iterations = 20)
@OutputTimeUnit(TimeUnit.MILLISECONDS)
public class BCELBenchmark {
private JarFile getJarFile() throws IOException {
String javaHome = System.getProperty("java.home");
return new JarFile(javaHome + "/lib/rt.jar");
}
private Iterable<JarEntry> getClasses(JarFile jar) {
return new IteratorIterable<>(new FilterIterator<>(new EnumerationIterator<>(jar.entries()), new Predicate<JarEntry>() {
@Override
public boolean evaluate(JarEntry entry) {
return entry.getName().endsWith(".class");
}
}));
}
/**
* Baseline benchmark. Read the classes but don't parse them.
*/
@Benchmark
public void baseline(Blackhole bh) throws IOException {
JarFile jar = getJarFile();
for (JarEntry entry : getClasses(jar)) {
byte[] bytes = IOUtils.toByteArray(jar.getInputStream(entry));
bh.consume(bytes);
}
jar.close();
}
@Benchmark
public void parser(Blackhole bh) throws IOException {
JarFile jar = getJarFile();
for (JarEntry entry : getClasses(jar)) {
byte[] bytes = IOUtils.toByteArray(jar.getInputStream(entry));
JavaClass clazz = new ClassParser(new ByteArrayInputStream(bytes), entry.getName()).parse();
bh.consume(clazz);
}
jar.close();
}
@Benchmark
public void generator(Blackhole bh) throws IOException {
JarFile jar = getJarFile();
for (JarEntry entry : getClasses(jar)) {
byte[] bytes = IOUtils.toByteArray(jar.getInputStream(entry));
JavaClass clazz = new ClassParser(new ByteArrayInputStream(bytes), entry.getName()).parse();
ClassGen cg = new ClassGen(clazz);
for (Method m : cg.getMethods()) {
MethodGen mg = new MethodGen(m, cg.getClassName(), cg.getConstantPool());
InstructionList il = mg.getInstructionList();
if (il != null) {
mg.getInstructionList().setPositions();
mg.setMaxLocals();
mg.setMaxStack();
}
cg.replaceMethod(m, mg.getMethod());
}
bh.consume(cg.getJavaClass().getBytes());
}
jar.close();
}
}
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