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 void InitializeThreadRegistry() {
34   static ALIGNED(64) char thread_registry_placeholder[sizeof(ThreadRegistry)];
35   thread_registry =
36       new (thread_registry_placeholder) ThreadRegistry(CreateThreadContext);
37 }
38 
39 ThreadContextLsanBase::ThreadContextLsanBase(int tid)
40     : ThreadContextBase(tid) {}
41 
42 void ThreadContextLsanBase::OnFinished() {
43   AllocatorThreadFinish();
44   DTLS_Destroy();
45 }
46 
47 u32 ThreadCreate(u32 parent_tid, uptr user_id, bool detached, void *arg) {
48   return thread_registry->CreateThread(user_id, detached, parent_tid, arg);
49 }
50 
51 void ThreadContextLsanBase::ThreadStart(u32 tid, tid_t os_id,
52                                         ThreadType thread_type, void *arg) {
53   thread_registry->StartThread(tid, os_id, thread_type, arg);
54   SetCurrentThread(tid);
55 }
56 
57 void ThreadFinish() {
58   thread_registry->FinishThread(GetCurrentThread());
59   SetCurrentThread(kInvalidTid);
60 }
61 
62 ThreadContext *CurrentThreadContext() {
63   if (!thread_registry)
64     return nullptr;
65   if (GetCurrentThread() == kInvalidTid)
66     return nullptr;
67   // No lock needed when getting current thread.
68   return (ThreadContext *)thread_registry->GetThreadLocked(GetCurrentThread());
69 }
70 
71 static bool FindThreadByUid(ThreadContextBase *tctx, void *arg) {
72   uptr uid = (uptr)arg;
73   if (tctx->user_id == uid && tctx->status != ThreadStatusInvalid) {
74     return true;
75   }
76   return false;
77 }
78 
79 u32 ThreadTid(uptr uid) {
80   return thread_registry->FindThread(FindThreadByUid, (void *)uid);
81 }
82 
83 void ThreadDetach(u32 tid) {
84   CHECK_NE(tid, kInvalidTid);
85   thread_registry->DetachThread(tid, /* arg */ nullptr);
86 }
87 
88 void ThreadJoin(u32 tid) {
89   CHECK_NE(tid, kInvalidTid);
90   thread_registry->JoinThread(tid, /* arg */ nullptr);
91 }
92 
93 void EnsureMainThreadIDIsCorrect() {
94   if (GetCurrentThread() == kMainTid)
95     CurrentThreadContext()->os_id = GetTid();
96 }
97 
98 ///// Interface to the common LSan module. /////
99 
100 void ForEachExtraStackRange(tid_t os_id, RangeIteratorCallback callback,
101                             void *arg) {}
102 
103 void LockThreadRegistry() { thread_registry->Lock(); }
104 
105 void UnlockThreadRegistry() { thread_registry->Unlock(); }
106 
107 ThreadRegistry *GetThreadRegistryLocked() {
108   thread_registry->CheckLocked();
109   return thread_registry;
110 }
111 
112 }  // namespace __lsan
113