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// Copyright 2018 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// AddressSanitizer support.
#ifndef V8_BASE_SANITIZER_ASAN_H_
#define V8_BASE_SANITIZER_ASAN_H_
#include <type_traits>
#include "src/base/macros.h"
#ifdef V8_USE_ADDRESS_SANITIZER
#include <sanitizer/asan_interface.h>
#if !defined(ASAN_POISON_MEMORY_REGION) || !defined(ASAN_UNPOISON_MEMORY_REGION)
#error \
"ASAN_POISON_MEMORY_REGION and ASAN_UNPOISON_MEMORY_REGION must be defined"
#endif
#define DISABLE_ASAN __attribute__((no_sanitize_address))
// Check that all bytes in a memory region are poisoned. This is different from
// `__asan_region_is_poisoned()` which only requires a single byte in the region
// to be poisoned. Please note that the macro only works if both start and size
// are multiple of asan's shadow memory granularity.
#define ASAN_CHECK_WHOLE_MEMORY_REGION_IS_POISONED(start, size) \
do { \
for (size_t i = 0; i < size; i++) { \
CHECK(__asan_address_is_poisoned(reinterpret_cast<const char*>(start) + \
i)); \
} \
} while (0)
#else // !V8_USE_ADDRESS_SANITIZER
#define DISABLE_ASAN
#define ASAN_POISON_MEMORY_REGION(start, size) \
static_assert(std::is_pointer<decltype(start)>::value, \
"static type violation"); \
static_assert(std::is_convertible<decltype(size), size_t>::value, \
"static type violation"); \
USE(start, size)
#define ASAN_UNPOISON_MEMORY_REGION(start, size) \
ASAN_POISON_MEMORY_REGION(start, size)
#define ASAN_CHECK_WHOLE_MEMORY_REGION_IS_POISONED(start, size) \
ASAN_POISON_MEMORY_REGION(start, size)
#endif // !V8_USE_ADDRESS_SANITIZER
#endif // V8_BASE_SANITIZER_ASAN_H_
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