// Licensed to the Apache Software Foundation (ASF) under one

// or more contributor license agreements.  See the NOTICE file

// distributed with this work for additional information

// regarding copyright ownership.  The ASF licenses this file

// to you 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 <sanitizer/asan_interface.h>

class AsanPoisonGuard {

#ifdef ADDRESS_SANITIZER

public:

    // Poison the memory region to prevent accidental access

    // during the lifetime of this object.

    AsanPoisonGuard(const void* start, size_t len) : start(start), len(len) {

        ASAN_POISON_MEMORY_REGION(start, len);

    }

    // Unpoison the memory region when this object goes out of scope.

    ~AsanPoisonGuard() { ASAN_UNPOISON_MEMORY_REGION(start, len); }

private:

    const void* start;

    size_t len;

#else

public:

    // No-op for platforms without ASAN_DEFINE_REGION_MACROS

    AsanPoisonGuard(const void*, size_t) {}

    ~AsanPoisonGuard() = default;

#endif

};