1 files changed, 62 insertions, 0 deletions
diff --git a/sanitizers/src/main/java/com/code_intelligence/jazzer/sanitizers/utils/ReflectionUtils.java b/sanitizers/src/main/java/com/code_intelligence/jazzer/sanitizers/utils/ReflectionUtils.java
new file mode 100644
index 00000000..fd6ac72f
--- /dev/null
+++ b/sanitizers/src/main/java/com/code_intelligence/jazzer/sanitizers/utils/ReflectionUtils.java
@@ -0,0 +1,62 @@
+// 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);
+  }
+}