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diff --git a/src/main/java/com/code_intelligence/jazzer/runtime/JazzerInternal.java b/src/main/java/com/code_intelligence/jazzer/runtime/JazzerInternal.java
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+// Copyright 2021 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.runtime;
+
+import java.util.ArrayList;
+
+final public class JazzerInternal {
+  public static Throwable lastFinding;
+  // The value is only relevant when regression testing. Read by the bytecode emitted by
+  // HookMethodVisitor to enable hooks only when invoked from a @FuzzTest.
+  //
+  // Alternatives considered:
+  // Making this thread local rather than global may potentially allow to run fuzz tests in
+  // parallel with regular unit tests, but it is next to impossible to determine which thread is
+  // currently doing work for a fuzz test versus a regular unit test. Instead, @FuzzTest is
+  // annotated with @Isolated.
+  @SuppressWarnings("unused") public static boolean hooksEnabled = true;
+
+  private static final ArrayList<Runnable> onFuzzTargetReadyCallbacks = new ArrayList<>();
+
+  // Accessed from api.Jazzer via reflection.
+  public static void reportFindingFromHook(Throwable finding) {
+    lastFinding = finding;
+    // Throw an Error that is hard to catch (short of outright ignoring it) in order to quickly
+    // terminate the execution of the fuzz target. The finding will be reported as soon as the fuzz
+    // target returns even if this Error is swallowed.
+    throw new HardToCatchError();
+  }
+
+  public static void registerOnFuzzTargetReadyCallback(Runnable callback) {
+    onFuzzTargetReadyCallbacks.add(callback);
+  }
+
+  public static void onFuzzTargetReady(String fuzzTargetClass) {
+    onFuzzTargetReadyCallbacks.forEach(Runnable::run);
+    onFuzzTargetReadyCallbacks.clear();
+  }
+}