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// Copyright © Tavian Barnes <tavianator@tavianator.com>
// SPDX-License-Identifier: 0BSD
/**
* Sanitizer interface.
*/
#ifndef BFS_SANITY_H
#define BFS_SANITY_H
#include <stddef.h>
// Call macro(ptr, size) or macro(ptr, sizeof(*ptr))
#define SANITIZE_CALL(...) \
SANITIZE_CALL_(__VA_ARGS__, )
#define SANITIZE_CALL_(macro, ptr, ...) \
SANITIZE_CALL__(macro, ptr, __VA_ARGS__ sizeof(*(ptr)), )
#define SANITIZE_CALL__(macro, ptr, size, ...) \
macro(ptr, size)
#if __SANITIZE_ADDRESS__
# include <sanitizer/asan_interface.h>
/**
* sanitize_alloc(ptr, size = sizeof(*ptr))
*
* Mark a memory region as allocated.
*/
#define sanitize_alloc(...) SANITIZE_CALL(__asan_unpoison_memory_region, __VA_ARGS__)
/**
* sanitize_free(ptr, size = sizeof(*ptr))
*
* Mark a memory region as free.
*/
#define sanitize_free(...) SANITIZE_CALL(__asan_poison_memory_region, __VA_ARGS__)
/**
* Adjust the size of an allocated region, for things like dynamic arrays.
*
* @ptr
* The memory region.
* @old
* The previous usable size of the region.
* @new
* The new usable size of the region.
* @cap
* The total allocated capacity of the region.
*/
static inline void sanitize_resize(const void *ptr, size_t old, size_t new, size_t cap) {
const char *beg = ptr;
__sanitizer_annotate_contiguous_container(beg, beg + cap, beg + old, beg + new);
}
#else
# define sanitize_alloc(...) ((void)0)
# define sanitize_free(...) ((void)0)
# define sanitize_resize(ptr, old, new, cap) ((void)0)
#endif
#if __SANITIZE_MEMORY__
# include <sanitizer/msan_interface.h>
/**
* sanitize_init(ptr, size = sizeof(*ptr))
*
* Mark a memory region as initialized.
*/
#define sanitize_init(...) SANITIZE_CALL(__msan_unpoison, __VA_ARGS__)
/**
* sanitize_uninit(ptr, size = sizeof(*ptr))
*
* Mark a memory region as uninitialized.
*/
#define sanitize_uninit(...) SANITIZE_CALL(__msan_allocated_memory, __VA_ARGS__)
#else
# define sanitize_init(...) ((void)0)
# define sanitize_uninit(...) ((void)0)
#endif
/**
* Initialize a variable, unless sanitizers would detect uninitialized uses.
*/
#if __SANITIZE_MEMORY__
# define uninit(value)
#else
# define uninit(value) = value
#endif
#endif // BFS_SANITY_H
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