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NpeThrowBenchmark.java
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NpeThrowBenchmark.java
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/*
* JVM Performance Benchmarks
*
* Copyright (C) 2019 - 2024 Ionut Balosin
*
* 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 com.ionutbalosin.jvm.performance.benchmarks.compiler;
import java.util.concurrent.TimeUnit;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.CompilerControl;
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.Param;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.Warmup;
/*
* Test how the Compiler deals with implicit versus explicit null pointer exception while accessing the elements of an array list.
* The values inside the array are generated, as follows:
* - all are different from null, hence none throws NPE
* - all of them are null, hence all throw NPE
* - only a part of them are null, hence only a part of them throw NPE
*/
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@Warmup(iterations = 5, time = 10, timeUnit = TimeUnit.SECONDS)
@Measurement(iterations = 5, time = 10, timeUnit = TimeUnit.SECONDS)
@Fork(value = 5)
@State(Scope.Benchmark)
public class NpeThrowBenchmark {
// $ java -jar */*/benchmarks.jar ".*NpeThrowBenchmark.*"
@Param({"1024"})
private int size;
@Param({"0.0", "0.5", "1.0"})
private double threshold;
private Wrapper[] A;
@Setup
public void setup() {
A = new Wrapper[size];
for (int i = 0; i < size; i++) {
if (Math.random() < threshold) {
A[i] = null;
} else {
A[i] = new Wrapper();
}
}
}
@Benchmark
public void implicit_throw_npe() {
for (Wrapper object : A) {
try {
implicitThrowNpe(object);
} catch (NullPointerException e) {
// swallow exception
}
}
}
@Benchmark
public void explicit_throw_npe() {
for (Wrapper o : A) {
try {
explicitThrowNpe(o);
} catch (NullPointerException e) {
// swallow exception
}
}
}
@CompilerControl(CompilerControl.Mode.DONT_INLINE)
private int explicitThrowNpe(Wrapper o) {
if (o == null) {
throw new NullPointerException("Oops!");
}
return o.x;
}
@CompilerControl(CompilerControl.Mode.DONT_INLINE)
private int implicitThrowNpe(Wrapper o) {
return o.x;
}
private static class Wrapper {
public int x;
}
}