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// SPDX-FileCopyrightText: 2023 Olivier Dion <odion@efficios.com>
//
// SPDX-License-Identifier: LGPL-2.1-or-later
#ifndef _URCU_ANNOTATE_H
#define _URCU_ANNOTATE_H
/*
* urcu/annotate.h
*
* Userspace RCU - annotation header.
*/
/*
* WARNING!
*
* This API is highly experimental. There is zero guarantees of stability
* between releases.
*
* You have been warned.
*/
#include <stdio.h>
#include <stdlib.h>
#include <urcu/compiler.h>
enum cmm_annotate {
CMM_ANNOTATE_VOID,
CMM_ANNOTATE_LOAD,
CMM_ANNOTATE_STORE,
CMM_ANNOTATE_MB,
};
typedef enum cmm_annotate cmm_annotate_t __attribute__((__unused__));
#define cmm_annotate_define(name) \
cmm_annotate_t name = CMM_ANNOTATE_VOID
#ifdef CMM_SANITIZE_THREAD
# ifdef __cplusplus
extern "C" {
# endif
extern void __tsan_acquire(void *);
extern void __tsan_release(void *);
# ifdef __cplusplus
}
# endif
# define cmm_annotate_die(msg) \
do { \
fprintf(stderr, \
"(" __FILE__ ":%s@%u) Annotation ERROR: %s\n", \
__func__, __LINE__, msg); \
abort(); \
} while (0)
/* Only used for typechecking in macros. */
static inline cmm_annotate_t cmm_annotate_dereference(cmm_annotate_t *group)
{
return *group;
}
# define cmm_annotate_group_mb_acquire(group) \
do { \
switch (cmm_annotate_dereference(group)) { \
case CMM_ANNOTATE_VOID: \
break; \
case CMM_ANNOTATE_LOAD: \
break; \
case CMM_ANNOTATE_STORE: \
cmm_annotate_die("store for acquire group"); \
break; \
case CMM_ANNOTATE_MB: \
cmm_annotate_die( \
"redundant mb for acquire group" \
); \
break; \
} \
*(group) = CMM_ANNOTATE_MB; \
} while (0)
# define cmm_annotate_group_mb_release(group) \
do { \
switch (cmm_annotate_dereference(group)) { \
case CMM_ANNOTATE_VOID: \
break; \
case CMM_ANNOTATE_LOAD: \
cmm_annotate_die("load before release group"); \
break; \
case CMM_ANNOTATE_STORE: \
cmm_annotate_die( \
"store before release group" \
); \
break; \
case CMM_ANNOTATE_MB: \
cmm_annotate_die( \
"redundant mb of release group" \
); \
break; \
} \
*(group) = CMM_ANNOTATE_MB; \
} while (0)
# define cmm_annotate_group_mem_acquire(group, mem) \
do { \
__tsan_acquire((void*)(mem)); \
switch (cmm_annotate_dereference(group)) { \
case CMM_ANNOTATE_VOID: \
*(group) = CMM_ANNOTATE_LOAD; \
break; \
case CMM_ANNOTATE_MB: \
cmm_annotate_die( \
"load after mb for acquire group" \
); \
break; \
default: \
break; \
} \
} while (0)
# define cmm_annotate_group_mem_release(group, mem) \
do { \
__tsan_release((void*)(mem)); \
switch (cmm_annotate_dereference(group)) { \
case CMM_ANNOTATE_MB: \
break; \
default: \
cmm_annotate_die( \
"missing mb for release group" \
); \
} \
} while (0)
# define cmm_annotate_mem_acquire(mem) \
__tsan_acquire((void*)(mem))
# define cmm_annotate_mem_release(mem) \
__tsan_release((void*)(mem))
#else
# define cmm_annotate_group_mb_acquire(group) \
(void) (group)
# define cmm_annotate_group_mb_release(group) \
(void) (group)
# define cmm_annotate_group_mem_acquire(group, mem) \
(void) (group)
# define cmm_annotate_group_mem_release(group, mem) \
(void) (group)
# define cmm_annotate_mem_acquire(mem) \
do { } while (0)
# define cmm_annotate_mem_release(mem) \
do { } while (0)
#endif /* CMM_SANITIZE_THREAD */
#endif /* _URCU_ANNOTATE_H */
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