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/* -*- Mode: C++; tab-width: 2; 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>
extern "C" {
/* These definitions are usually provided through the
* sanitizer/asan_interface.h header installed by ASan.
*/
void __asan_poison_memory_region(void const volatile *addr, size_t size)
__attribute__((visibility("default")));
void __asan_unpoison_memory_region(void const volatile *addr, size_t size)
__attribute__((visibility("default")));
#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))
}
#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
#endif /* mozilla_MemoryChecking_h_ */
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