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// Copyright 2022 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.instrumentor;
import java.lang.reflect.Field;
import sun.misc.Unsafe;
public final class Unsafe2CoverageMap {
private static final Unsafe UNSAFE;
static {
Unsafe unsafe;
try {
Field f = Unsafe.class.getDeclaredField("theUnsafe");
f.setAccessible(true);
unsafe = (Unsafe) f.get(null);
} catch (IllegalAccessException | NoSuchFieldException e) {
e.printStackTrace();
System.exit(1);
// Not reached.
unsafe = null;
}
UNSAFE = unsafe;
}
// The current target, JsonSanitizer, uses less than 2048 coverage counters.
private static final long NUM_COUNTERS = 4096;
private static final long countersAddress = UNSAFE.allocateMemory(NUM_COUNTERS);
static {
UNSAFE.setMemory(countersAddress, NUM_COUNTERS, (byte) 0);
}
public static void enlargeIfNeeded(int nextId) {
// Statically sized counters buffer.
}
public static void recordCoverage(final int id) {
final long address = countersAddress + id;
final byte counter = UNSAFE.getByte(address);
UNSAFE.putByte(address, (byte) (counter == -1 ? 1 : counter + 1));
}
}
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