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
CreateThreadContext(u32 tid)28 static ThreadContextBase *CreateThreadContext(u32 tid) {
29 void *mem = MmapOrDie(sizeof(ThreadContext), "ThreadContext");
30 return new (mem) ThreadContext(tid);
31 }
32
InitializeThreadRegistry()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
ThreadContextLsanBase(int tid)39 ThreadContextLsanBase::ThreadContextLsanBase(int tid)
40 : ThreadContextBase(tid) {}
41
OnFinished()42 void ThreadContextLsanBase::OnFinished() {
43 AllocatorThreadFinish();
44 DTLS_Destroy();
45 }
46
ThreadCreate(u32 parent_tid,uptr user_id,bool detached,void * arg)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
ThreadStart(u32 tid,tid_t os_id,ThreadType thread_type,void * arg)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
ThreadFinish()57 void ThreadFinish() {
58 thread_registry->FinishThread(GetCurrentThread());
59 SetCurrentThread(kInvalidTid);
60 }
61
CurrentThreadContext()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
FindThreadByUid(ThreadContextBase * tctx,void * arg)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
ThreadTid(uptr uid)79 u32 ThreadTid(uptr uid) {
80 return thread_registry->FindThread(FindThreadByUid, (void *)uid);
81 }
82
ThreadDetach(u32 tid)83 void ThreadDetach(u32 tid) {
84 CHECK_NE(tid, kInvalidTid);
85 thread_registry->DetachThread(tid, /* arg */ nullptr);
86 }
87
ThreadJoin(u32 tid)88 void ThreadJoin(u32 tid) {
89 CHECK_NE(tid, kInvalidTid);
90 thread_registry->JoinThread(tid, /* arg */ nullptr);
91 }
92
EnsureMainThreadIDIsCorrect()93 void EnsureMainThreadIDIsCorrect() {
94 if (GetCurrentThread() == kMainTid)
95 CurrentThreadContext()->os_id = GetTid();
96 }
97
98 ///// Interface to the common LSan module. /////
99
ForEachExtraStackRange(tid_t os_id,RangeIteratorCallback callback,void * arg)100 void ForEachExtraStackRange(tid_t os_id, RangeIteratorCallback callback,
101 void *arg) {}
102
LockThreadRegistry()103 void LockThreadRegistry() { thread_registry->Lock(); }
104
UnlockThreadRegistry()105 void UnlockThreadRegistry() { thread_registry->Unlock(); }
106
GetThreadRegistryLocked()107 ThreadRegistry *GetThreadRegistryLocked() {
108 thread_registry->CheckLocked();
109 return thread_registry;
110 }
111
112 } // namespace __lsan
113