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// Copyright 2020 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.
#ifndef V8_HEAP_CPPGC_SANITIZERS_H_
#define V8_HEAP_CPPGC_SANITIZERS_H_
#include <stdint.h>
#include <string.h>
#include "src/base/macros.h"
//
// TODO(chromium:1056170): Find a place in base for sanitizer support.
//
#ifdef V8_USE_ADDRESS_SANITIZER
#include <sanitizer/asan_interface.h>
#define NO_SANITIZE_ADDRESS __attribute__((no_sanitize_address))
#if !defined(ASAN_POISON_MEMORY_REGION) || !defined(ASAN_UNPOISON_MEMORY_REGION)
#error "ASAN_POISON_MEMORY_REGION must be defined"
#endif
#else // !V8_USE_ADDRESS_SANITIZER
#define NO_SANITIZE_ADDRESS
#define ASAN_POISON_MEMORY_REGION(addr, size) ((void)(addr), (void)(size))
#define ASAN_UNPOISON_MEMORY_REGION(addr, size) ((void)(addr), (void)(size))
#endif // V8_USE_ADDRESS_SANITIZER
#ifdef V8_USE_MEMORY_SANITIZER
#include <sanitizer/msan_interface.h>
#define MSAN_POISON(addr, size) __msan_allocated_memory(addr, size)
#define MSAN_UNPOISON(addr, size) __msan_unpoison(addr, size)
#else // !V8_USE_MEMORY_SANITIZER
#define MSAN_POISON(addr, size) ((void)(addr), (void)(size))
#define MSAN_UNPOISON(addr, size) ((void)(addr), (void)(size))
#endif // V8_USE_MEMORY_SANITIZER
// API for newly allocated or reclaimed memory.
#if defined(V8_USE_MEMORY_SANITIZER)
#define SET_MEMORY_ACCESIBLE(address, size) \
MSAN_UNPOISON(address, size); \
memset((address), 0, (size))
#define SET_MEMORY_INACCESIBLE(address, size) MSAN_POISON((address), (size))
#elif DEBUG || defined(V8_USE_ADDRESS_SANITIZER)
#define SET_MEMORY_ACCESIBLE(address, size) \
ASAN_UNPOISON_MEMORY_REGION(address, size); \
memset((address), 0, (size))
#define SET_MEMORY_INACCESIBLE(address, size) \
::cppgc::internal::ZapMemory((address), (size)); \
ASAN_POISON_MEMORY_REGION(address, size)
#else
#define SET_MEMORY_ACCESIBLE(address, size) memset((address), 0, (size))
#define SET_MEMORY_INACCESIBLE(address, size) ((void)(address), (void)(size))
#endif
namespace cppgc {
namespace internal {
inline void ZapMemory(void* address, size_t size) {
static constexpr uint8_t kZappedValue = 0xcd;
memset(address, kZappedValue, size);
}
} // namespace internal
} // namespace cppgc
#endif // V8_HEAP_CPPGC_SANITIZERS_H_
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