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clang-p2996/compiler-rt/lib/tsan/rtl/tsan_interceptors_mac.cpp
Blue Gaston ae484c21c0 [TSAN][Darwin] Forward declare spinlock functions on darwin for TSAN interceptors 
Spinlock symbols are removed from headers in MacOS version 10.12 and greater.
Even though they are deprecated, the symbols remain available on the system.

The TSAN interceptors currently cause a build failure after this version because
of the change in availability of the symbol.

We want to continue intercepting the symbols available on the OS.
So we add forward declarations so that the TSAN interceptors can build.

This is tested with the existing osspinlock_norace test.

Differential Revision: https://reviews.llvm.org/D146537
2023-03-21 12:16:19 -07:00

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//===-- tsan_interceptors_mac.cpp -----------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file is a part of ThreadSanitizer (TSan), a race detector.
//
// Mac-specific interceptors.
//===----------------------------------------------------------------------===//
#include "sanitizer_common/sanitizer_platform.h"
#if SANITIZER_APPLE
#include "interception/interception.h"
#include "tsan_interceptors.h"
#include "tsan_interface.h"
#include "tsan_interface_ann.h"
#include "tsan_spinlock_defs_mac.h"
#include "sanitizer_common/sanitizer_addrhashmap.h"
#include <errno.h>
#include <libkern/OSAtomic.h>
#include <objc/objc-sync.h>
#include <os/lock.h>
#include <sys/ucontext.h>
#if defined(__has_include) && __has_include(<xpc/xpc.h>)
#include <xpc/xpc.h>
#endif // #if defined(__has_include) && __has_include(<xpc/xpc.h>)
typedef long long_t;
extern "C" {
int getcontext(ucontext_t *ucp) __attribute__((returns_twice));
int setcontext(const ucontext_t *ucp);
}
namespace __tsan {
// The non-barrier versions of OSAtomic* functions are semantically mo_relaxed,
// but the two variants (e.g. OSAtomicAdd32 and OSAtomicAdd32Barrier) are
// actually aliases of each other, and we cannot have different interceptors for
// them, because they're actually the same function. Thus, we have to stay
// conservative and treat the non-barrier versions as mo_acq_rel.
static constexpr morder kMacOrderBarrier = mo_acq_rel;
static constexpr morder kMacOrderNonBarrier = mo_acq_rel;
static constexpr morder kMacFailureOrder = mo_relaxed;
#define OSATOMIC_INTERCEPTOR(return_t, t, tsan_t, f, tsan_atomic_f, mo) \
TSAN_INTERCEPTOR(return_t, f, t x, volatile t *ptr) { \
SCOPED_TSAN_INTERCEPTOR(f, x, ptr); \
return tsan_atomic_f((volatile tsan_t *)ptr, x, mo); \
}
#define OSATOMIC_INTERCEPTOR_PLUS_X(return_t, t, tsan_t, f, tsan_atomic_f, mo) \
TSAN_INTERCEPTOR(return_t, f, t x, volatile t *ptr) { \
SCOPED_TSAN_INTERCEPTOR(f, x, ptr); \
return tsan_atomic_f((volatile tsan_t *)ptr, x, mo) + x; \
}
#define OSATOMIC_INTERCEPTOR_PLUS_1(return_t, t, tsan_t, f, tsan_atomic_f, mo) \
TSAN_INTERCEPTOR(return_t, f, volatile t *ptr) { \
SCOPED_TSAN_INTERCEPTOR(f, ptr); \
return tsan_atomic_f((volatile tsan_t *)ptr, 1, mo) + 1; \
}
#define OSATOMIC_INTERCEPTOR_MINUS_1(return_t, t, tsan_t, f, tsan_atomic_f, \
mo) \
TSAN_INTERCEPTOR(return_t, f, volatile t *ptr) { \
SCOPED_TSAN_INTERCEPTOR(f, ptr); \
return tsan_atomic_f((volatile tsan_t *)ptr, 1, mo) - 1; \
}
#define OSATOMIC_INTERCEPTORS_ARITHMETIC(f, tsan_atomic_f, m) \
m(int32_t, int32_t, a32, f##32, __tsan_atomic32_##tsan_atomic_f, \
kMacOrderNonBarrier) \
m(int32_t, int32_t, a32, f##32##Barrier, __tsan_atomic32_##tsan_atomic_f, \
kMacOrderBarrier) \
m(int64_t, int64_t, a64, f##64, __tsan_atomic64_##tsan_atomic_f, \
kMacOrderNonBarrier) \
m(int64_t, int64_t, a64, f##64##Barrier, __tsan_atomic64_##tsan_atomic_f, \
kMacOrderBarrier)
#define OSATOMIC_INTERCEPTORS_BITWISE(f, tsan_atomic_f, m, m_orig) \
m(int32_t, uint32_t, a32, f##32, __tsan_atomic32_##tsan_atomic_f, \
kMacOrderNonBarrier) \
m(int32_t, uint32_t, a32, f##32##Barrier, __tsan_atomic32_##tsan_atomic_f, \
kMacOrderBarrier) \
m_orig(int32_t, uint32_t, a32, f##32##Orig, __tsan_atomic32_##tsan_atomic_f, \
kMacOrderNonBarrier) \
m_orig(int32_t, uint32_t, a32, f##32##OrigBarrier, \
__tsan_atomic32_##tsan_atomic_f, kMacOrderBarrier)
OSATOMIC_INTERCEPTORS_ARITHMETIC(OSAtomicAdd, fetch_add,
OSATOMIC_INTERCEPTOR_PLUS_X)
OSATOMIC_INTERCEPTORS_ARITHMETIC(OSAtomicIncrement, fetch_add,
OSATOMIC_INTERCEPTOR_PLUS_1)
OSATOMIC_INTERCEPTORS_ARITHMETIC(OSAtomicDecrement, fetch_sub,
OSATOMIC_INTERCEPTOR_MINUS_1)
OSATOMIC_INTERCEPTORS_BITWISE(OSAtomicOr, fetch_or, OSATOMIC_INTERCEPTOR_PLUS_X,
OSATOMIC_INTERCEPTOR)
OSATOMIC_INTERCEPTORS_BITWISE(OSAtomicAnd, fetch_and,
OSATOMIC_INTERCEPTOR_PLUS_X, OSATOMIC_INTERCEPTOR)
OSATOMIC_INTERCEPTORS_BITWISE(OSAtomicXor, fetch_xor,
OSATOMIC_INTERCEPTOR_PLUS_X, OSATOMIC_INTERCEPTOR)
#define OSATOMIC_INTERCEPTORS_CAS(f, tsan_atomic_f, tsan_t, t) \
TSAN_INTERCEPTOR(bool, f, t old_value, t new_value, t volatile *ptr) { \
SCOPED_TSAN_INTERCEPTOR(f, old_value, new_value, ptr); \
return tsan_atomic_f##_compare_exchange_strong( \
(volatile tsan_t *)ptr, (tsan_t *)&old_value, (tsan_t)new_value, \
kMacOrderNonBarrier, kMacFailureOrder); \
} \
\
TSAN_INTERCEPTOR(bool, f##Barrier, t old_value, t new_value, \
t volatile *ptr) { \
SCOPED_TSAN_INTERCEPTOR(f##Barrier, old_value, new_value, ptr); \
return tsan_atomic_f##_compare_exchange_strong( \
(volatile tsan_t *)ptr, (tsan_t *)&old_value, (tsan_t)new_value, \
kMacOrderBarrier, kMacFailureOrder); \
}
OSATOMIC_INTERCEPTORS_CAS(OSAtomicCompareAndSwapInt, __tsan_atomic32, a32, int)
OSATOMIC_INTERCEPTORS_CAS(OSAtomicCompareAndSwapLong, __tsan_atomic64, a64,
long_t)
OSATOMIC_INTERCEPTORS_CAS(OSAtomicCompareAndSwapPtr, __tsan_atomic64, a64,
void *)
OSATOMIC_INTERCEPTORS_CAS(OSAtomicCompareAndSwap32, __tsan_atomic32, a32,
int32_t)
OSATOMIC_INTERCEPTORS_CAS(OSAtomicCompareAndSwap64, __tsan_atomic64, a64,
int64_t)
#define OSATOMIC_INTERCEPTOR_BITOP(f, op, clear, mo) \
TSAN_INTERCEPTOR(bool, f, uint32_t n, volatile void *ptr) { \
SCOPED_TSAN_INTERCEPTOR(f, n, ptr); \
volatile char *byte_ptr = ((volatile char *)ptr) + (n >> 3); \
char bit = 0x80u >> (n & 7); \
char mask = clear ? ~bit : bit; \
char orig_byte = op((volatile a8 *)byte_ptr, mask, mo); \
return orig_byte & bit; \
}
#define OSATOMIC_INTERCEPTORS_BITOP(f, op, clear) \
OSATOMIC_INTERCEPTOR_BITOP(f, op, clear, kMacOrderNonBarrier) \
OSATOMIC_INTERCEPTOR_BITOP(f##Barrier, op, clear, kMacOrderBarrier)
OSATOMIC_INTERCEPTORS_BITOP(OSAtomicTestAndSet, __tsan_atomic8_fetch_or, false)
OSATOMIC_INTERCEPTORS_BITOP(OSAtomicTestAndClear, __tsan_atomic8_fetch_and,
true)
TSAN_INTERCEPTOR(void, OSAtomicEnqueue, OSQueueHead *list, void *item,
size_t offset) {
SCOPED_TSAN_INTERCEPTOR(OSAtomicEnqueue, list, item, offset);
__tsan_release(item);
REAL(OSAtomicEnqueue)(list, item, offset);
}
TSAN_INTERCEPTOR(void *, OSAtomicDequeue, OSQueueHead *list, size_t offset) {
SCOPED_TSAN_INTERCEPTOR(OSAtomicDequeue, list, offset);
void *item = REAL(OSAtomicDequeue)(list, offset);
if (item) __tsan_acquire(item);
return item;
}
// OSAtomicFifoEnqueue and OSAtomicFifoDequeue are only on OS X.
#if !SANITIZER_IOS
TSAN_INTERCEPTOR(void, OSAtomicFifoEnqueue, OSFifoQueueHead *list, void *item,
size_t offset) {
SCOPED_TSAN_INTERCEPTOR(OSAtomicFifoEnqueue, list, item, offset);
__tsan_release(item);
REAL(OSAtomicFifoEnqueue)(list, item, offset);
}
TSAN_INTERCEPTOR(void *, OSAtomicFifoDequeue, OSFifoQueueHead *list,
size_t offset) {
SCOPED_TSAN_INTERCEPTOR(OSAtomicFifoDequeue, list, offset);
void *item = REAL(OSAtomicFifoDequeue)(list, offset);
if (item) __tsan_acquire(item);
return item;
}
#endif
TSAN_INTERCEPTOR(void, OSSpinLockLock, volatile OSSpinLock *lock) {
CHECK(!cur_thread()->is_dead);
if (!cur_thread()->is_inited) {
return REAL(OSSpinLockLock)(lock);
}
SCOPED_TSAN_INTERCEPTOR(OSSpinLockLock, lock);
REAL(OSSpinLockLock)(lock);
Acquire(thr, pc, (uptr)lock);
}
TSAN_INTERCEPTOR(bool, OSSpinLockTry, volatile OSSpinLock *lock) {
CHECK(!cur_thread()->is_dead);
if (!cur_thread()->is_inited) {
return REAL(OSSpinLockTry)(lock);
}
SCOPED_TSAN_INTERCEPTOR(OSSpinLockTry, lock);
bool result = REAL(OSSpinLockTry)(lock);
if (result)
Acquire(thr, pc, (uptr)lock);
return result;
}
TSAN_INTERCEPTOR(void, OSSpinLockUnlock, volatile OSSpinLock *lock) {
CHECK(!cur_thread()->is_dead);
if (!cur_thread()->is_inited) {
return REAL(OSSpinLockUnlock)(lock);
}
SCOPED_TSAN_INTERCEPTOR(OSSpinLockUnlock, lock);
Release(thr, pc, (uptr)lock);
REAL(OSSpinLockUnlock)(lock);
}
TSAN_INTERCEPTOR(void, os_lock_lock, void *lock) {
CHECK(!cur_thread()->is_dead);
if (!cur_thread()->is_inited) {
return REAL(os_lock_lock)(lock);
}
SCOPED_TSAN_INTERCEPTOR(os_lock_lock, lock);
REAL(os_lock_lock)(lock);
Acquire(thr, pc, (uptr)lock);
}
TSAN_INTERCEPTOR(bool, os_lock_trylock, void *lock) {
CHECK(!cur_thread()->is_dead);
if (!cur_thread()->is_inited) {
return REAL(os_lock_trylock)(lock);
}
SCOPED_TSAN_INTERCEPTOR(os_lock_trylock, lock);
bool result = REAL(os_lock_trylock)(lock);
if (result)
Acquire(thr, pc, (uptr)lock);
return result;
}
TSAN_INTERCEPTOR(void, os_lock_unlock, void *lock) {
CHECK(!cur_thread()->is_dead);
if (!cur_thread()->is_inited) {
return REAL(os_lock_unlock)(lock);
}
SCOPED_TSAN_INTERCEPTOR(os_lock_unlock, lock);
Release(thr, pc, (uptr)lock);
REAL(os_lock_unlock)(lock);
}
TSAN_INTERCEPTOR(void, os_unfair_lock_lock, os_unfair_lock_t lock) {
if (!cur_thread()->is_inited || cur_thread()->is_dead) {
return REAL(os_unfair_lock_lock)(lock);
}
SCOPED_TSAN_INTERCEPTOR(os_unfair_lock_lock, lock);
REAL(os_unfair_lock_lock)(lock);
Acquire(thr, pc, (uptr)lock);
}
TSAN_INTERCEPTOR(void, os_unfair_lock_lock_with_options, os_unfair_lock_t lock,
u32 options) {
if (!cur_thread()->is_inited || cur_thread()->is_dead) {
return REAL(os_unfair_lock_lock_with_options)(lock, options);
}
SCOPED_TSAN_INTERCEPTOR(os_unfair_lock_lock_with_options, lock, options);
REAL(os_unfair_lock_lock_with_options)(lock, options);
Acquire(thr, pc, (uptr)lock);
}
TSAN_INTERCEPTOR(bool, os_unfair_lock_trylock, os_unfair_lock_t lock) {
if (!cur_thread()->is_inited || cur_thread()->is_dead) {
return REAL(os_unfair_lock_trylock)(lock);
}
SCOPED_TSAN_INTERCEPTOR(os_unfair_lock_trylock, lock);
bool result = REAL(os_unfair_lock_trylock)(lock);
if (result)
Acquire(thr, pc, (uptr)lock);
return result;
}
TSAN_INTERCEPTOR(void, os_unfair_lock_unlock, os_unfair_lock_t lock) {
if (!cur_thread()->is_inited || cur_thread()->is_dead) {
return REAL(os_unfair_lock_unlock)(lock);
}
SCOPED_TSAN_INTERCEPTOR(os_unfair_lock_unlock, lock);
Release(thr, pc, (uptr)lock);
REAL(os_unfair_lock_unlock)(lock);
}
#if defined(__has_include) && __has_include(<xpc/xpc.h>)
TSAN_INTERCEPTOR(void, xpc_connection_set_event_handler,
xpc_connection_t connection, xpc_handler_t handler) {
SCOPED_TSAN_INTERCEPTOR(xpc_connection_set_event_handler, connection,
handler);
Release(thr, pc, (uptr)connection);
xpc_handler_t new_handler = ^(xpc_object_t object) {
{
SCOPED_INTERCEPTOR_RAW(xpc_connection_set_event_handler);
Acquire(thr, pc, (uptr)connection);
}
handler(object);
};
REAL(xpc_connection_set_event_handler)(connection, new_handler);
}
TSAN_INTERCEPTOR(void, xpc_connection_send_barrier, xpc_connection_t connection,
dispatch_block_t barrier) {
SCOPED_TSAN_INTERCEPTOR(xpc_connection_send_barrier, connection, barrier);
Release(thr, pc, (uptr)connection);
dispatch_block_t new_barrier = ^() {
{
SCOPED_INTERCEPTOR_RAW(xpc_connection_send_barrier);
Acquire(thr, pc, (uptr)connection);
}
barrier();
};
REAL(xpc_connection_send_barrier)(connection, new_barrier);
}
TSAN_INTERCEPTOR(void, xpc_connection_send_message_with_reply,
xpc_connection_t connection, xpc_object_t message,
dispatch_queue_t replyq, xpc_handler_t handler) {
SCOPED_TSAN_INTERCEPTOR(xpc_connection_send_message_with_reply, connection,
message, replyq, handler);
Release(thr, pc, (uptr)connection);
xpc_handler_t new_handler = ^(xpc_object_t object) {
{
SCOPED_INTERCEPTOR_RAW(xpc_connection_send_message_with_reply);
Acquire(thr, pc, (uptr)connection);
}
handler(object);
};
REAL(xpc_connection_send_message_with_reply)
(connection, message, replyq, new_handler);
}
TSAN_INTERCEPTOR(void, xpc_connection_cancel, xpc_connection_t connection) {
SCOPED_TSAN_INTERCEPTOR(xpc_connection_cancel, connection);
Release(thr, pc, (uptr)connection);
REAL(xpc_connection_cancel)(connection);
}
#endif // #if defined(__has_include) && __has_include(<xpc/xpc.h>)
// Determines whether the Obj-C object pointer is a tagged pointer. Tagged
// pointers encode the object data directly in their pointer bits and do not
// have an associated memory allocation. The Obj-C runtime uses tagged pointers
// to transparently optimize small objects.
static bool IsTaggedObjCPointer(id obj) {
const uptr kPossibleTaggedBits = 0x8000000000000001ull;
return ((uptr)obj & kPossibleTaggedBits) != 0;
}
// Returns an address which can be used to inform TSan about synchronization
// points (MutexLock/Unlock). The TSan infrastructure expects this to be a valid
// address in the process space. We do a small allocation here to obtain a
// stable address (the array backing the hash map can change). The memory is
// never free'd (leaked) and allocation and locking are slow, but this code only
// runs for @synchronized with tagged pointers, which is very rare.
static uptr GetOrCreateSyncAddress(uptr addr, ThreadState *thr, uptr pc) {
typedef AddrHashMap<uptr, 5> Map;
static Map Addresses;
Map::Handle h(&Addresses, addr);
if (h.created()) {
ThreadIgnoreBegin(thr, pc);
*h = (uptr) user_alloc(thr, pc, /*size=*/1);
ThreadIgnoreEnd(thr);
}
return *h;
}
// Returns an address on which we can synchronize given an Obj-C object pointer.
// For normal object pointers, this is just the address of the object in memory.
// Tagged pointers are not backed by an actual memory allocation, so we need to
// synthesize a valid address.
static uptr SyncAddressForObjCObject(id obj, ThreadState *thr, uptr pc) {
if (IsTaggedObjCPointer(obj))
return GetOrCreateSyncAddress((uptr)obj, thr, pc);
return (uptr)obj;
}
TSAN_INTERCEPTOR(int, objc_sync_enter, id obj) {
SCOPED_TSAN_INTERCEPTOR(objc_sync_enter, obj);
if (!obj) return REAL(objc_sync_enter)(obj);
uptr addr = SyncAddressForObjCObject(obj, thr, pc);
MutexPreLock(thr, pc, addr, MutexFlagWriteReentrant);
int result = REAL(objc_sync_enter)(obj);
CHECK_EQ(result, OBJC_SYNC_SUCCESS);
MutexPostLock(thr, pc, addr, MutexFlagWriteReentrant);
return result;
}
TSAN_INTERCEPTOR(int, objc_sync_exit, id obj) {
SCOPED_TSAN_INTERCEPTOR(objc_sync_exit, obj);
if (!obj) return REAL(objc_sync_exit)(obj);
uptr addr = SyncAddressForObjCObject(obj, thr, pc);
MutexUnlock(thr, pc, addr);
int result = REAL(objc_sync_exit)(obj);
if (result != OBJC_SYNC_SUCCESS) MutexInvalidAccess(thr, pc, addr);
return result;
}
TSAN_INTERCEPTOR(int, swapcontext, ucontext_t *oucp, const ucontext_t *ucp) {
{
SCOPED_INTERCEPTOR_RAW(swapcontext, oucp, ucp);
}
// Because of swapcontext() semantics we have no option but to copy its
// implementation here
if (!oucp || !ucp) {
errno = EINVAL;
return -1;
}
ThreadState *thr = cur_thread();
const int UCF_SWAPPED = 0x80000000;
oucp->uc_onstack &= ~UCF_SWAPPED;
thr->ignore_interceptors++;
int ret = getcontext(oucp);
if (!(oucp->uc_onstack & UCF_SWAPPED)) {
thr->ignore_interceptors--;
if (!ret) {
oucp->uc_onstack |= UCF_SWAPPED;
ret = setcontext(ucp);
}
}
return ret;
}
// On macOS, libc++ is always linked dynamically, so intercepting works the
// usual way.
#define STDCXX_INTERCEPTOR TSAN_INTERCEPTOR
namespace {
struct fake_shared_weak_count {
volatile a64 shared_owners;
volatile a64 shared_weak_owners;
virtual void _unused_0x0() = 0;
virtual void _unused_0x8() = 0;
virtual void on_zero_shared() = 0;
virtual void _unused_0x18() = 0;
virtual void on_zero_shared_weak() = 0;
virtual ~fake_shared_weak_count() = 0; // suppress -Wnon-virtual-dtor
};
} // namespace
// The following code adds libc++ interceptors for:
// void __shared_weak_count::__release_shared() _NOEXCEPT;
// bool __shared_count::__release_shared() _NOEXCEPT;
// Shared and weak pointers in C++ maintain reference counts via atomics in
// libc++.dylib, which are TSan-invisible, and this leads to false positives in
// destructor code. These interceptors re-implements the whole functions so that
// the mo_acq_rel semantics of the atomic decrement are visible.
//
// Unfortunately, the interceptors cannot simply Acquire/Release some sync
// object and call the original function, because it would have a race between
// the sync and the destruction of the object. Calling both under a lock will
// not work because the destructor can invoke this interceptor again (and even
// in a different thread, so recursive locks don't help).
STDCXX_INTERCEPTOR(void, _ZNSt3__119__shared_weak_count16__release_sharedEv,
fake_shared_weak_count *o) {
if (!flags()->shared_ptr_interceptor)
return REAL(_ZNSt3__119__shared_weak_count16__release_sharedEv)(o);
SCOPED_TSAN_INTERCEPTOR(_ZNSt3__119__shared_weak_count16__release_sharedEv,
o);
if (__tsan_atomic64_fetch_add(&o->shared_owners, -1, mo_release) == 0) {
Acquire(thr, pc, (uptr)&o->shared_owners);
o->on_zero_shared();
if (__tsan_atomic64_fetch_add(&o->shared_weak_owners, -1, mo_release) ==
0) {
Acquire(thr, pc, (uptr)&o->shared_weak_owners);
o->on_zero_shared_weak();
}
}
}
STDCXX_INTERCEPTOR(bool, _ZNSt3__114__shared_count16__release_sharedEv,
fake_shared_weak_count *o) {
if (!flags()->shared_ptr_interceptor)
return REAL(_ZNSt3__114__shared_count16__release_sharedEv)(o);
SCOPED_TSAN_INTERCEPTOR(_ZNSt3__114__shared_count16__release_sharedEv, o);
if (__tsan_atomic64_fetch_add(&o->shared_owners, -1, mo_release) == 0) {
Acquire(thr, pc, (uptr)&o->shared_owners);
o->on_zero_shared();
return true;
}
return false;
}
namespace {
struct call_once_callback_args {
void (*orig_func)(void *arg);
void *orig_arg;
void *flag;
};
void call_once_callback_wrapper(void *arg) {
call_once_callback_args *new_args = (call_once_callback_args *)arg;
new_args->orig_func(new_args->orig_arg);
__tsan_release(new_args->flag);
}
} // namespace
// This adds a libc++ interceptor for:
// void __call_once(volatile unsigned long&, void*, void(*)(void*));
// C++11 call_once is implemented via an internal function __call_once which is
// inside libc++.dylib, and the atomic release store inside it is thus
// TSan-invisible. To avoid false positives, this interceptor wraps the callback
// function and performs an explicit Release after the user code has run.
STDCXX_INTERCEPTOR(void, _ZNSt3__111__call_onceERVmPvPFvS2_E, void *flag,
void *arg, void (*func)(void *arg)) {
call_once_callback_args new_args = {func, arg, flag};
REAL(_ZNSt3__111__call_onceERVmPvPFvS2_E)(flag, &new_args,
call_once_callback_wrapper);
}
} // namespace __tsan
#endif // SANITIZER_APPLE
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