src/jmh/java/com/code_intelligence/jazzer/instrumentor/DirectByteBuffer2CoverageMap.java


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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.nio.ByteBuffer;

public final class DirectByteBuffer2CoverageMap {
  // The current target, JsonSanitizer, uses less than 2048 coverage counters.
  private static final int NUM_COUNTERS = 4096;
  public static final ByteBuffer counters = ByteBuffer.allocateDirect(NUM_COUNTERS);

  public static void enlargeIfNeeded(int nextId) {
    // Statically sized counters buffer.
  }

  public static void recordCoverage(final int id) {
    final byte counter = counters.get(id);
    counters.put(id, (byte) (counter == -1 ? 1 : counter + 1));
  }
}