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/*
* Copyright 2023 Code Intelligence GmbH
*
* Licensed 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.code_intelligence.jazzer.mutation.mutator.lang;
import static com.code_intelligence.jazzer.mutation.support.TypeSupport.isPrimitive;
import static com.code_intelligence.jazzer.mutation.support.TypeSupport.notNull;
import static java.util.Arrays.stream;
import com.code_intelligence.jazzer.mutation.api.Debuggable;
import com.code_intelligence.jazzer.mutation.api.MutatorFactory;
import com.code_intelligence.jazzer.mutation.api.PseudoRandom;
import com.code_intelligence.jazzer.mutation.api.SerializingMutator;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.lang.annotation.Annotation;
import java.lang.reflect.AnnotatedType;
import java.util.Optional;
import java.util.function.Predicate;
final class NullableMutatorFactory extends MutatorFactory {
private static boolean isNotNullAnnotation(Annotation annotation) {
// There are many NotNull annotations in the wild (including our own) and we want to recognize
// them all.
return annotation.annotationType().getSimpleName().equals("NotNull");
}
@Override
public Optional<SerializingMutator<?>> tryCreate(AnnotatedType type, MutatorFactory factory) {
if (isPrimitive(type)
|| stream(type.getAnnotations()).anyMatch(NullableMutatorFactory::isNotNullAnnotation)) {
return Optional.empty();
}
return factory.tryCreate(notNull(type), factory).map(NullableMutator::new);
}
private static final class NullableMutator<T> extends SerializingMutator<T> {
private static final int INVERSE_FREQUENCY_NULL = 100;
private final SerializingMutator<T> mutator;
NullableMutator(SerializingMutator<T> mutator) {
this.mutator = mutator;
}
@Override
public T read(DataInputStream in) throws IOException {
if (in.readBoolean()) {
return mutator.read(in);
} else {
return null;
}
}
@Override
public void write(T value, DataOutputStream out) throws IOException {
out.writeBoolean(value != null);
if (value != null) {
mutator.write(value, out);
}
}
@Override
public T init(PseudoRandom prng) {
if (prng.trueInOneOutOf(INVERSE_FREQUENCY_NULL)) {
return null;
} else {
return mutator.init(prng);
}
}
@Override
public T mutate(T value, PseudoRandom prng) {
if (value == null) {
return mutator.init(prng);
} else if (prng.trueInOneOutOf(INVERSE_FREQUENCY_NULL)) {
return null;
} else {
return mutator.mutate(value, prng);
}
}
@Override
public T crossOver(T value, T otherValue, PseudoRandom prng) {
// Prefer to cross over actual values and only return null if
// both are null or at INVERSE_FREQUENCY_NULL probability.
if (value != null && otherValue != null) {
return mutator.crossOver(value, otherValue, prng);
} else if (value == null && otherValue == null) {
return null;
} else if (prng.trueInOneOutOf(INVERSE_FREQUENCY_NULL)) {
return null;
} else {
return value != null ? value : otherValue;
}
}
@Override
public T detach(T value) {
if (value == null) {
return null;
} else {
return mutator.detach(value);
}
}
@Override
public String toDebugString(Predicate<Debuggable> isInCycle) {
return "Nullable<" + mutator.toDebugString(isInCycle) + ">";
}
}
}
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