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73 lines
2.4 KiB
C
73 lines
2.4 KiB
C
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* Provides a common interface to the ASan (AddressSanitizer) and Valgrind
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* functions used to mark memory in certain ways. In detail, the following
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* three macros are provided:
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*
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* MOZ_MAKE_MEM_NOACCESS - Mark memory as unsafe to access (e.g. freed)
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* MOZ_MAKE_MEM_UNDEFINED - Mark memory as accessible, with content undefined
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* MOZ_MAKE_MEM_DEFINED - Mark memory as accessible, with content defined
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*
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* With Valgrind in use, these directly map to the three respective Valgrind
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* macros. With ASan in use, the NOACCESS macro maps to poisoning the memory,
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* while the UNDEFINED/DEFINED macros unpoison memory.
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*
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* With no memory checker available, all macros expand to the empty statement.
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*/
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#ifndef mozilla_MemoryChecking_h
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#define mozilla_MemoryChecking_h
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#if defined(MOZ_VALGRIND)
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#include "valgrind/memcheck.h"
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#endif
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#if defined(MOZ_ASAN) || defined(MOZ_VALGRIND)
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#define MOZ_HAVE_MEM_CHECKS 1
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#endif
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#if defined(MOZ_ASAN)
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#include <stddef.h>
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extern "C" {
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/* These definitions are usually provided through the
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* sanitizer/asan_interface.h header installed by ASan.
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*/
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void __asan_poison_memory_region(void const volatile *addr, size_t size)
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__attribute__((visibility("default")));
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void __asan_unpoison_memory_region(void const volatile *addr, size_t size)
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__attribute__((visibility("default")));
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#define MOZ_MAKE_MEM_NOACCESS(addr, size) \
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__asan_poison_memory_region((addr), (size))
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#define MOZ_MAKE_MEM_UNDEFINED(addr, size) \
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__asan_unpoison_memory_region((addr), (size))
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#define MOZ_MAKE_MEM_DEFINED(addr, size) \
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__asan_unpoison_memory_region((addr), (size))
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}
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#elif defined(MOZ_VALGRIND)
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#define MOZ_MAKE_MEM_NOACCESS(addr, size) \
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VALGRIND_MAKE_MEM_NOACCESS((addr), (size))
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#define MOZ_MAKE_MEM_UNDEFINED(addr, size) \
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VALGRIND_MAKE_MEM_UNDEFINED((addr), (size))
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#define MOZ_MAKE_MEM_DEFINED(addr, size) \
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VALGRIND_MAKE_MEM_DEFINED((addr), (size))
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#else
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#define MOZ_MAKE_MEM_NOACCESS(addr, size) do {} while(0)
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#define MOZ_MAKE_MEM_UNDEFINED(addr, size) do {} while(0)
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#define MOZ_MAKE_MEM_DEFINED(addr, size) do {} while(0)
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#endif
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#endif /* mozilla_MemoryChecking_h */
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