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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/*
* Provides a common interface to the ASan (AddressSanitizer) and Valgrind
* functions used to mark memory in certain ways. In detail, the following
* three macros are provided:
*
* MOZ_MAKE_MEM_NOACCESS - Mark memory as unsafe to access (e.g. freed)
* MOZ_MAKE_MEM_UNDEFINED - Mark memory as accessible, with content undefined
* MOZ_MAKE_MEM_DEFINED - Mark memory as accessible, with content defined
*
* With Valgrind in use, these directly map to the three respective Valgrind
* macros. With ASan in use, the NOACCESS macro maps to poisoning the memory,
* while the UNDEFINED/DEFINED macros unpoison memory.
*
* With no memory checker available, all macros expand to the empty statement.
*/
#ifndef mozilla_MemoryChecking_h
#define mozilla_MemoryChecking_h
#if defined(MOZ_VALGRIND)
#include "valgrind/memcheck.h"
#endif
#if defined(MOZ_ASAN) || defined(MOZ_VALGRIND)
#define MOZ_HAVE_MEM_CHECKS 1
#endif
#if defined(MOZ_ASAN)
#include <stddef.h>
#include "mozilla/Attributes.h"
#include "mozilla/Types.h"
#ifdef _MSC_VER
// In clang-cl based ASAN, we link against the memory poisoning functions
// statically.
#define MOZ_ASAN_VISIBILITY
#else
#define MOZ_ASAN_VISIBILITY MOZ_EXPORT
#endif
extern "C" {
/* These definitions are usually provided through the
* sanitizer/asan_interface.h header installed by ASan.
*/
void MOZ_ASAN_VISIBILITY
__asan_poison_memory_region(void const volatile *addr, size_t size);
void MOZ_ASAN_VISIBILITY
__asan_unpoison_memory_region(void const volatile *addr, size_t size);
#define MOZ_MAKE_MEM_NOACCESS(addr, size) \
__asan_poison_memory_region((addr), (size))
#define MOZ_MAKE_MEM_UNDEFINED(addr, size) \
__asan_unpoison_memory_region((addr), (size))
#define MOZ_MAKE_MEM_DEFINED(addr, size) \
__asan_unpoison_memory_region((addr), (size))
/*
* These definitions are usually provided through the
* sanitizer/lsan_interface.h header installed by LSan.
*/
void MOZ_EXPORT
__lsan_ignore_object(const void *p);
}
#elif defined(MOZ_MSAN)
#include <stddef.h>
#include "mozilla/Types.h"
extern "C" {
/* These definitions are usually provided through the
* sanitizer/msan_interface.h header installed by MSan.
*/
void MOZ_EXPORT
__msan_poison(void const volatile *addr, size_t size);
void MOZ_EXPORT
__msan_unpoison(void const volatile *addr, size_t size);
#define MOZ_MAKE_MEM_NOACCESS(addr, size) \
__msan_poison((addr), (size))
#define MOZ_MAKE_MEM_UNDEFINED(addr, size) \
__msan_poison((addr), (size))
#define MOZ_MAKE_MEM_DEFINED(addr, size) \
__msan_unpoison((addr), (size))
}
#elif defined(MOZ_VALGRIND)
#define MOZ_MAKE_MEM_NOACCESS(addr, size) \
VALGRIND_MAKE_MEM_NOACCESS((addr), (size))
#define MOZ_MAKE_MEM_UNDEFINED(addr, size) \
VALGRIND_MAKE_MEM_UNDEFINED((addr), (size))
#define MOZ_MAKE_MEM_DEFINED(addr, size) \
VALGRIND_MAKE_MEM_DEFINED((addr), (size))
#else
#define MOZ_MAKE_MEM_NOACCESS(addr, size) do {} while (0)
#define MOZ_MAKE_MEM_UNDEFINED(addr, size) do {} while (0)
#define MOZ_MAKE_MEM_DEFINED(addr, size) do {} while (0)
#endif
/*
* MOZ_LSAN_INTENTIONAL_LEAK(X) is a macro to tell LeakSanitizer that X
* points to a value that will intentionally never be deallocated during
* the execution of the process.
*
* Additional uses of this macro should be reviewed by people
* conversant in leak-checking and/or MFBT peers.
*/
#if defined(MOZ_ASAN)
# define MOZ_LSAN_INTENTIONALLY_LEAK_OBJECT(X) __lsan_ignore_object(X)
#else
# define MOZ_LSAN_INTENTIONALLY_LEAK_OBJECT(X) /* nothing */
#endif // defined(MOZ_ASAN)
#endif /* mozilla_MemoryChecking_h */
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