1 //===-- tsan_sync.h ---------------------------------------------*- C++ -*-===//
3 // This file is distributed under the University of Illinois Open Source
4 // License. See LICENSE.TXT for details.
6 //===----------------------------------------------------------------------===//
8 // This file is a part of ThreadSanitizer (TSan), a race detector.
10 //===----------------------------------------------------------------------===//
14 #include "sanitizer_common/sanitizer_atomic.h"
15 #include "sanitizer_common/sanitizer_common.h"
16 #include "sanitizer_common/sanitizer_deadlock_detector_interface.h"
17 #include "tsan_defs.h"
18 #include "tsan_clock.h"
19 #include "tsan_mutex.h"
20 #include "tsan_dense_alloc.h"
24 // These need to match __tsan_mutex_* flags defined in tsan_interface.h.
25 // See documentation there as well.
27 MutexFlagLinkerInit
= 1 << 0, // __tsan_mutex_linker_init
28 MutexFlagWriteReentrant
= 1 << 1, // __tsan_mutex_write_reentrant
29 MutexFlagReadReentrant
= 1 << 2, // __tsan_mutex_read_reentrant
30 MutexFlagReadLock
= 1 << 3, // __tsan_mutex_read_lock
31 MutexFlagTryLock
= 1 << 4, // __tsan_mutex_try_lock
32 MutexFlagTryLockFailed
= 1 << 5, // __tsan_mutex_try_lock_failed
33 MutexFlagRecursiveLock
= 1 << 6, // __tsan_mutex_recursive_lock
34 MutexFlagRecursiveUnlock
= 1 << 7, // __tsan_mutex_recursive_unlock
35 MutexFlagNotStatic
= 1 << 8, // __tsan_mutex_not_static
37 // The following flags are runtime private.
38 // Mutex API misuse was detected, so don't report any more.
39 MutexFlagBroken
= 1 << 30,
40 // We did not intercept pre lock event, so handle it on post lock.
41 MutexFlagDoPreLockOnPostLock
= 1 << 29,
42 // Must list all mutex creation flags.
43 MutexCreationFlagMask
= MutexFlagLinkerInit
|
44 MutexFlagWriteReentrant
|
45 MutexFlagReadReentrant
|
52 static const int kInvalidTid
= -1;
54 uptr addr
; // overwritten by DenseSlabAlloc freelist
56 u64 uid
; // Globally unique id.
57 u32 creation_stack_id
;
58 int owner_tid
; // Set only by exclusive owners.
61 atomic_uint32_t flags
;
62 u32 next
; // in MetaMap
64 SyncClock read_clock
; // Used for rw mutexes only.
65 // The clock is placed last, so that it is situated on a different cache line
66 // with the mtx. This reduces contention for hot sync objects.
69 void Init(ThreadState
*thr
, uptr pc
, uptr addr
, u64 uid
);
70 void Reset(Processor
*proc
);
73 // 48 lsb is addr, then 14 bits is low part of uid, then 2 zero bits.
74 return GetLsb((u64
)addr
| (uid
<< 48), 60);
76 bool CheckId(u64 uid
) const {
77 CHECK_EQ(uid
, GetLsb(uid
, 14));
78 return GetLsb(this->uid
, 14) == uid
;
80 static uptr
SplitId(u64 id
, u64
*uid
) {
82 return (uptr
)GetLsb(id
, 48);
85 bool IsFlagSet(u32 f
) const {
86 return atomic_load_relaxed(&flags
) & f
;
89 void SetFlags(u32 f
) {
90 atomic_store_relaxed(&flags
, atomic_load_relaxed(&flags
) | f
);
93 void UpdateFlags(u32 flagz
) {
94 // Filter out operation flags.
95 if (!(flagz
& MutexCreationFlagMask
))
97 u32 current
= atomic_load_relaxed(&flags
);
98 if (current
& MutexCreationFlagMask
)
100 // Note: this can be called from MutexPostReadLock which holds only read
101 // lock on the SyncVar.
102 atomic_store_relaxed(&flags
, current
| (flagz
& MutexCreationFlagMask
));
106 /* MetaMap allows to map arbitrary user pointers onto various descriptors.
107 Currently it maps pointers to heap block descriptors and sync var descs.
108 It uses 1/2 direct shadow, see tsan_platform.h.
114 void AllocBlock(ThreadState
*thr
, uptr pc
, uptr p
, uptr sz
);
115 uptr
FreeBlock(Processor
*proc
, uptr p
);
116 bool FreeRange(Processor
*proc
, uptr p
, uptr sz
);
117 void ResetRange(Processor
*proc
, uptr p
, uptr sz
);
118 MBlock
* GetBlock(uptr p
);
120 SyncVar
* GetOrCreateAndLock(ThreadState
*thr
, uptr pc
,
121 uptr addr
, bool write_lock
);
122 SyncVar
* GetIfExistsAndLock(uptr addr
, bool write_lock
);
124 void MoveMemory(uptr src
, uptr dst
, uptr sz
);
126 void OnProcIdle(Processor
*proc
);
129 static const u32 kFlagMask
= 3u << 30;
130 static const u32 kFlagBlock
= 1u << 30;
131 static const u32 kFlagSync
= 2u << 30;
132 typedef DenseSlabAlloc
<MBlock
, 1<<16, 1<<12> BlockAlloc
;
133 typedef DenseSlabAlloc
<SyncVar
, 1<<16, 1<<10> SyncAlloc
;
134 BlockAlloc block_alloc_
;
135 SyncAlloc sync_alloc_
;
136 atomic_uint64_t uid_gen_
;
138 SyncVar
* GetAndLock(ThreadState
*thr
, uptr pc
, uptr addr
, bool write_lock
,
142 } // namespace __tsan
144 #endif // TSAN_SYNC_H