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mdbx: minor alignment fix for lck-less stub to avoid false-positive alarm from UndefinedBehaviorSanitize.

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Change-Id: I8d9bc00ccfc7228cb42f9419cf77e8eadb92f918
This commit is contained in:
Leonid Yuriev 2021-05-08 22:43:16 +03:00
parent 7c45f75010
commit 43f1823cdc
2 changed files with 14 additions and 7 deletions
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14
src/core.c
View File

@ -10852,6 +10852,14 @@ static void __cold mdbx_setup_pagesize(MDBX_env *env, const size_t pagesize) {
env->me_options.dp_initial = env->me_options.dp_limit;
}
static __inline MDBX_CONST_FUNCTION MDBX_lockinfo *
lckless_stub(const MDBX_env *env) {
uintptr_t stub = (uintptr_t)&env->x_lckless_stub;
/* align to avoid false-positive alarm from UndefinedBehaviorSanitizer */
stub = (stub + MDBX_CACHELINE_SIZE - 1) & ~(MDBX_CACHELINE_SIZE - 1);
return (MDBX_lockinfo *)stub;
}
__cold int mdbx_env_create(MDBX_env **penv) {
MDBX_env *env = mdbx_calloc(1, sizeof(MDBX_env));
if (unlikely(!env))
@ -10905,7 +10913,7 @@ __cold int mdbx_env_create(MDBX_env **penv) {
}
#if MDBX_LOCKING > MDBX_LOCKING_SYSV
MDBX_lockinfo *const stub = (MDBX_lockinfo *)&env->me_lckless_stub;
MDBX_lockinfo *const stub = lckless_stub(env);
rc = mdbx_ipclock_stub(&stub->mti_wlock);
#endif /* MDBX_LOCKING */
if (unlikely(rc != MDBX_SUCCESS)) {
@ -11838,7 +11846,7 @@ static __cold int mdbx_setup_lck(MDBX_env *env, char *lck_pathname,
lcklist_unlock();
/* end of a locked section ---------------------------------------------- */
env->me_lck = (MDBX_lockinfo *)&env->me_lckless_stub;
env->me_lck = lckless_stub(env);
env->me_maxreaders = UINT_MAX;
mdbx_debug("lck-setup:%s%s%s", " lck-less",
(env->me_flags & MDBX_RDONLY) ? " readonly" : "",
@ -12695,7 +12703,7 @@ __cold int mdbx_env_close_ex(MDBX_env *env, bool dont_sync) {
#endif /* Windows */
#if MDBX_LOCKING > MDBX_LOCKING_SYSV
MDBX_lockinfo *const stub = (MDBX_lockinfo *)&env->me_lckless_stub;
MDBX_lockinfo *const stub = lckless_stub(env);
mdbx_ensure(env, mdbx_ipclock_destroy(&stub->mti_wlock) == 0);
#endif /* MDBX_LOCKING */

7
src/internals.h
View File

@ -1236,10 +1236,9 @@ struct MDBX_env {
#endif /* xMDBX_DEBUG_SPILLING */
/* ------------------------------------------------- stub for lck-less mode */
alignas(MDBX_CACHELINE_SIZE) uint64_t
me_lckless_stub[((sizeof(MDBX_lockinfo) + MDBX_CACHELINE_SIZE - 1) &
~(MDBX_CACHELINE_SIZE - 1)) /
8];
MDBX_atomic_uint64_t
x_lckless_stub[(sizeof(MDBX_lockinfo) + MDBX_CACHELINE_SIZE - 1) /
sizeof(MDBX_atomic_uint64_t)];
};
#ifndef __cplusplus