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/*
* Copyright 2020 Google LLC
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkASAN_DEFINED
#define SkASAN_DEFINED
#include <cstddef>
#ifdef MOZ_SKIA
#include "mozilla/MemoryChecking.h"
#ifdef MOZ_HAVE_MEM_CHECKS
#define SK_SANITIZE_ADDRESS MOZ_HAVE_MEM_CHECKS
#endif
static inline void sk_asan_poison_memory_region(void const volatile *addr, size_t size) {
MOZ_MAKE_MEM_NOACCESS(addr, size);
}
static inline void sk_asan_unpoison_memory_region(void const volatile *addr, size_t size) {
MOZ_MAKE_MEM_DEFINED(addr, size);
}
#else // !MOZ_SKIA
#ifdef __SANITIZE_ADDRESS__
#define SK_SANITIZE_ADDRESS 1
#endif
#if !defined(SK_SANITIZE_ADDRESS) && defined(__has_feature)
#if __has_feature(address_sanitizer)
#define SK_SANITIZE_ADDRESS 1
#endif
#endif
// Typically declared in LLVM's asan_interface.h.
#ifdef SK_SANITIZE_ADDRESS
extern "C" {
void __asan_poison_memory_region(void const volatile *addr, size_t size);
void __asan_unpoison_memory_region(void const volatile *addr, size_t size);
}
#endif
// Code that implements bespoke allocation arenas can poison the entire arena on creation, then
// unpoison chunks of arena memory as they are parceled out. Consider leaving gaps between blocks
// to detect buffer overrun.
static inline void sk_asan_poison_memory_region(void const volatile *addr, size_t size) {
#ifdef SK_SANITIZE_ADDRESS
__asan_poison_memory_region(addr, size);
#endif
}
static inline void sk_asan_unpoison_memory_region(void const volatile *addr, size_t size) {
#ifdef SK_SANITIZE_ADDRESS
__asan_unpoison_memory_region(addr, size);
#endif
}
#endif // !MOZ_SKIA
#endif // SkASAN_DEFINED