xref: /freebsd/contrib/llvm-project/compiler-rt/lib/lsan/lsan_thread.cpp (revision c1d255d3ffdbe447de3ab875bf4e7d7accc5bfc5)
1 //=-- lsan_thread.cpp -----------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file is a part of LeakSanitizer.
10 // See lsan_thread.h for details.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "lsan_thread.h"
15 
16 #include "lsan.h"
17 #include "lsan_allocator.h"
18 #include "lsan_common.h"
19 #include "sanitizer_common/sanitizer_common.h"
20 #include "sanitizer_common/sanitizer_placement_new.h"
21 #include "sanitizer_common/sanitizer_thread_registry.h"
22 #include "sanitizer_common/sanitizer_tls_get_addr.h"
23 
24 namespace __lsan {
25 
26 static ThreadRegistry *thread_registry;
27 
28 static ThreadContextBase *CreateThreadContext(u32 tid) {
29   void *mem = MmapOrDie(sizeof(ThreadContext), "ThreadContext");
30   return new (mem) ThreadContext(tid);
31 }
32 
33 static const uptr kMaxThreads = 1 << 13;
34 static const uptr kThreadQuarantineSize = 64;
35 
36 void InitializeThreadRegistry() {
37   static ALIGNED(64) char thread_registry_placeholder[sizeof(ThreadRegistry)];
38   thread_registry = new (thread_registry_placeholder)
39       ThreadRegistry(CreateThreadContext, kMaxThreads, kThreadQuarantineSize);
40 }
41 
42 ThreadContextLsanBase::ThreadContextLsanBase(int tid)
43     : ThreadContextBase(tid) {}
44 
45 void ThreadContextLsanBase::OnFinished() {
46   AllocatorThreadFinish();
47   DTLS_Destroy();
48 }
49 
50 u32 ThreadCreate(u32 parent_tid, uptr user_id, bool detached, void *arg) {
51   return thread_registry->CreateThread(user_id, detached, parent_tid, arg);
52 }
53 
54 void ThreadContextLsanBase::ThreadStart(u32 tid, tid_t os_id,
55                                         ThreadType thread_type, void *arg) {
56   thread_registry->StartThread(tid, os_id, thread_type, arg);
57   SetCurrentThread(tid);
58 }
59 
60 void ThreadFinish() {
61   thread_registry->FinishThread(GetCurrentThread());
62   SetCurrentThread(kInvalidTid);
63 }
64 
65 ThreadContext *CurrentThreadContext() {
66   if (!thread_registry)
67     return nullptr;
68   if (GetCurrentThread() == kInvalidTid)
69     return nullptr;
70   // No lock needed when getting current thread.
71   return (ThreadContext *)thread_registry->GetThreadLocked(GetCurrentThread());
72 }
73 
74 static bool FindThreadByUid(ThreadContextBase *tctx, void *arg) {
75   uptr uid = (uptr)arg;
76   if (tctx->user_id == uid && tctx->status != ThreadStatusInvalid) {
77     return true;
78   }
79   return false;
80 }
81 
82 u32 ThreadTid(uptr uid) {
83   return thread_registry->FindThread(FindThreadByUid, (void *)uid);
84 }
85 
86 void ThreadDetach(u32 tid) {
87   CHECK_NE(tid, kInvalidTid);
88   thread_registry->DetachThread(tid, /* arg */ nullptr);
89 }
90 
91 void ThreadJoin(u32 tid) {
92   CHECK_NE(tid, kInvalidTid);
93   thread_registry->JoinThread(tid, /* arg */ nullptr);
94 }
95 
96 void EnsureMainThreadIDIsCorrect() {
97   if (GetCurrentThread() == 0)
98     CurrentThreadContext()->os_id = GetTid();
99 }
100 
101 ///// Interface to the common LSan module. /////
102 
103 void ForEachExtraStackRange(tid_t os_id, RangeIteratorCallback callback,
104                             void *arg) {}
105 
106 void LockThreadRegistry() { thread_registry->Lock(); }
107 
108 void UnlockThreadRegistry() { thread_registry->Unlock(); }
109 
110 ThreadRegistry *GetThreadRegistryLocked() {
111   thread_registry->CheckLocked();
112   return thread_registry;
113 }
114 
115 }  // namespace __lsan
116