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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.
*/
#pragma once
#include <jni.h>
#include <string>
#include "jvm_tooling.h"
namespace jazzer {
// The members of this struct are only accessed by libFuzzer.
struct __attribute__((packed)) PCTableEntry {
[[maybe_unused]] uintptr_t PC, PCFlags;
};
// CoverageTracker registers an array of 8-bit coverage counters with
// libFuzzer. The array is backed by a MappedByteBuffer on the Java
// side, where it is populated with the actual coverage information.
class CoverageTracker : public ExceptionPrinter {
private:
static uint8_t *counters_;
static uint32_t *fake_instructions_;
static PCTableEntry *pc_entries_;
static void JNICALL RegisterNewCoverageCounters(JNIEnv &env, jclass cls);
public:
static void Setup(JNIEnv &env);
// Clears the coverage counters array manually. It is cleared automatically
// by libFuzzer prior to running the fuzz target, so this function is only
// used in tests.
static void Clear();
// Returns the address of the coverage counters array.
static uint8_t *GetCoverageCounters();
static void RecordInitialCoverage(JNIEnv &env);
static void ReplayInitialCoverage(JNIEnv &env);
static std::string ComputeCoverage(JNIEnv &env);
};
} // namespace jazzer
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