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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();
}
}
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