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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.combinator;
import static com.code_intelligence.jazzer.mutation.support.InputStreamSupport.extendWithZeros;
import static com.code_intelligence.jazzer.mutation.support.Preconditions.require;
import static com.code_intelligence.jazzer.mutation.support.Preconditions.requireNonNullElements;
import static java.util.Arrays.stream;
import static java.util.stream.Collectors.joining;
import com.code_intelligence.jazzer.mutation.api.Debuggable;
import com.code_intelligence.jazzer.mutation.api.PseudoRandom;
import com.code_intelligence.jazzer.mutation.api.SerializingInPlaceMutator;
import com.code_intelligence.jazzer.mutation.api.SerializingMutator;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Arrays;
import java.util.function.Predicate;
@SuppressWarnings({"unchecked", "rawtypes"})
public final class ProductMutator extends SerializingInPlaceMutator<Object[]> {
// Inverse frequency in which product type mutators should be used in cross over.
private final static int INVERSE_PICK_VALUE_SUPPLIER_FREQUENCY = 100;
private final SerializingMutator[] mutators;
ProductMutator(SerializingMutator[] mutators) {
requireNonNullElements(mutators);
require(mutators.length > 0, "mutators must not be empty");
this.mutators = Arrays.copyOf(mutators, mutators.length);
}
@Override
public Object[] read(DataInputStream in) throws IOException {
Object[] value = new Object[mutators.length];
for (int i = 0; i < mutators.length; i++) {
value[i] = mutators[i].read(in);
}
return value;
}
@Override
public Object[] readExclusive(InputStream in) throws IOException {
Object[] value = new Object[mutators.length];
int lastIndex = mutators.length - 1;
DataInputStream endlessData = new DataInputStream(extendWithZeros(in));
for (int i = 0; i < lastIndex; i++) {
value[i] = mutators[i].read(endlessData);
}
value[lastIndex] = mutators[lastIndex].readExclusive(in);
return value;
}
@Override
public void write(Object[] value, DataOutputStream out) throws IOException {
for (int i = 0; i < mutators.length; i++) {
mutators[i].write(value[i], out);
}
}
@Override
public void writeExclusive(Object[] value, OutputStream out) throws IOException {
DataOutputStream dataOut = new DataOutputStream(out);
int lastIndex = mutators.length - 1;
for (int i = 0; i < lastIndex; i++) {
mutators[i].write(value[i], dataOut);
}
mutators[lastIndex].writeExclusive(value[lastIndex], out);
}
@Override
protected Object[] makeDefaultInstance() {
return new Object[mutators.length];
}
@Override
public void initInPlace(Object[] reference, PseudoRandom prng) {
for (int i = 0; i < mutators.length; i++) {
reference[i] = mutators[i].init(prng);
}
}
@Override
public void mutateInPlace(Object[] reference, PseudoRandom prng) {
int i = prng.indexIn(mutators);
reference[i] = mutators[i].mutate(reference[i], prng);
}
@Override
public void crossOverInPlace(Object[] reference, Object[] otherReference, PseudoRandom prng) {
for (int i = 0; i < mutators.length; i++) {
SerializingMutator mutator = mutators[i];
Object value = reference[i];
Object otherValue = otherReference[i];
Object crossedOver = prng.pickValue(value, otherValue,
() -> mutator.crossOver(value, otherValue, prng), INVERSE_PICK_VALUE_SUPPLIER_FREQUENCY);
if (crossedOver == otherReference) {
// If otherReference was picked, it needs to be detached as mutating
// it is prohibited in cross over.
crossedOver = mutator.detach(crossedOver);
}
reference[i] = crossedOver;
}
}
@Override
public Object[] detach(Object[] value) {
Object[] clone = new Object[mutators.length];
for (int i = 0; i < mutators.length; i++) {
clone[i] = mutators[i].detach(value[i]);
}
return clone;
}
@Override
public String toDebugString(Predicate<Debuggable> isInCycle) {
return stream(mutators)
.map(mutator -> mutator.toDebugString(isInCycle))
.collect(joining(", ", "[", "]"));
}
}
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