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[libc] Clean up sanitizer macros #98402

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Jul 10, 2024
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[libc] Clean up sanitizer macros #98402

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36 changes: 2 additions & 34 deletions libc/src/__support/macros/sanitizer.h
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Original file line number Diff line number Diff line change
Expand Up @@ -11,43 +11,11 @@

#include "src/__support/macros/config.h" //LIBC_HAS_FEATURE

//-----------------------------------------------------------------------------
// Properties to check the presence or absence or sanitizers
//-----------------------------------------------------------------------------

// MemorySanitizer (MSan) is a detector of uninitialized reads. It consists of
// a compiler instrumentation module and a run-time library. The
// MEMORY_SANITIZER macro is deprecated but we will continue to honor it for
// now.
#ifdef LIBC_HAVE_MEMORY_SANITIZER
#error "LIBC_HAVE_MEMORY_SANITIZER cannot be directly set."
#elif defined(MEMORY_SANITIZER) || defined(__SANITIZE_MEMORY__) || \
(LIBC_HAS_FEATURE(memory_sanitizer) && !defined(__native_client__))
#define LIBC_HAVE_MEMORY_SANITIZER
#endif

// AddressSanitizer (ASan) is a fast memory error detector. The
// ADDRESS_SANITIZER macro is deprecated but we will continue to honor it for
// now.
#ifdef LIBC_HAVE_ADDRESS_SANITIZER
#error "LIBC_HAVE_ADDRESS_SANITIZER cannot be directly set."
#elif defined(ADDRESS_SANITIZER) || defined(__SANITIZE_ADDRESS__) || \
LIBC_HAS_FEATURE(address_sanitizer)
#define LIBC_HAVE_ADDRESS_SANITIZER
#endif

// HWAddressSanitizer (HWASan) is a fast, low memory overhead error detector.
#ifdef LIBC_HAVE_HWADDRESS_SANITIZER
#error "LIBC_HAVE_HWADDRESS_SANITIZER cannot be directly set."
#elif LIBC_HAS_FEATURE(hwaddress_sanitizer)
#define LIBC_HAVE_HWADDRESS_SANITIZER
#endif

//-----------------------------------------------------------------------------
// Functions to unpoison memory
//-----------------------------------------------------------------------------

#if defined(LIBC_HAVE_MEMORY_SANITIZER)
#if LIBC_HAS_FEATURE(memory_sanitizer)
// Only perform MSAN unpoison in non-constexpr context.
#include <sanitizer/msan_interface.h>
#define MSAN_UNPOISON(addr, size) \
Expand All @@ -59,7 +27,7 @@
#define MSAN_UNPOISON(ptr, size)
#endif

#ifdef LIBC_HAVE_ADDRESS_SANITIZER
#if LIBC_HAS_FEATURE(address_sanitizer)
#include <sanitizer/asan_interface.h>
#define ASAN_POISON_MEMORY_REGION(addr, size) \
__asan_poison_memory_region((addr), (size))
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