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JQF: Feedback-directed Quickcheck for Java - Guided fuzzing interface
/*
* Copyright (c) 2017-2018 The Regents of the University of California
*
* 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.
*
* 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
* HOLDER 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
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package edu.berkeley.cs.jqf.fuzz.junit.quickcheck;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;
import com.pholser.junit.quickcheck.generator.GenerationStatus;
import com.pholser.junit.quickcheck.internal.GeometricDistribution;
import com.pholser.junit.quickcheck.random.SourceOfRandomness;
/**
* Provides a generation status that does not track the number of trials
* generated so far. This is useful for guided fuzzing where the burden
* of making choices is on the guidance system rather than on quickcheck.
*
* @author Rohan Padhye
*/
public class NonTrackingGenerationStatus implements GenerationStatus {
public static final int MEAN_SIZE = 10;
private final SourceOfRandomness random;
private final Map, Object> contextValues = new HashMap<>();
private final GeometricDistribution geometric = new GeometricDistribution();
public NonTrackingGenerationStatus(SourceOfRandomness random) {
this.random = random;
}
@Override
public int size() {
return geometric.sampleWithMean(MEAN_SIZE, random);
}
@Override
public int attempts() {
throw new UnsupportedOperationException("attempts() and @ValueOf" +
" is not supported in guided mode.");
}
@Override
public GenerationStatus setValue(Key key, T value) {
contextValues.put(key, value);
return this;
}
@Override
public Optional valueOf(Key key) {
return Optional.ofNullable(key.cast(contextValues.get(key)));
}
}