sanitizers/src/main/java/com/code_intelligence/jazzer/sanitizers/utils/ReflectionUtils.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.sanitizers.utils;

import java.lang.reflect.Field;
import sun.misc.Unsafe;

public final class ReflectionUtils {
  public static final long INVALID_OFFSET = Long.MIN_VALUE;

  private static final boolean JAZZER_REFLECTION_DEBUG =
      "1".equals(System.getenv("JAZZER_REFLECTION_DEBUG"));

  public static Class<?> clazz(String className) {
    try {
      return Class.forName(className);
    } catch (ClassNotFoundException e) {
      if (JAZZER_REFLECTION_DEBUG)
        e.printStackTrace();
      return null;
    }
  }

  public static Class<?> nestedClass(Class<?> parentClass, String nestedClassName) {
    return clazz(parentClass.getName() + "$" + nestedClassName);
  }

  public static Field field(Class<?> clazz, String name, Class<?> type) {
    if (clazz == null)
      return null;
    try {
      Field field = clazz.getDeclaredField(name);
      if (!field.getType().equals(type)) {
        throw new NoSuchFieldException(
            "Expected " + name + " to be of type " + type + " (is: " + field.getType() + ")");
      }
      return field;
    } catch (NoSuchFieldException e) {
      if (JAZZER_REFLECTION_DEBUG)
        e.printStackTrace();
      return null;
    }
  }

  public static long offset(Unsafe unsafe, Field field) {
    if (unsafe == null || field == null)
      return INVALID_OFFSET;
    return unsafe.objectFieldOffset(field);
  }
}