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_history.h"
22#include "sanitizer_common/sanitizer_thread_registry.h"
23#include "sanitizer_common/sanitizer_tls_get_addr.h"
24
25namespace __lsan {
26
27static ThreadRegistry *thread_registry;
28static ThreadArgRetval *thread_arg_retval;
29
30static Mutex mu_for_thread_context;
31static LowLevelAllocator allocator_for_thread_context;
32
33static ThreadContextBase *CreateThreadContext(u32 tid) {
34 Lock lock(&mu_for_thread_context);
35 return new (allocator_for_thread_context) ThreadContext(tid);
36}
37
38void InitializeThreads() {
39 alignas(alignof(ThreadRegistry)) static char
40 thread_registry_placeholder[sizeof(ThreadRegistry)];
41 thread_registry =
42 new (thread_registry_placeholder) ThreadRegistry(CreateThreadContext);
43
44 alignas(alignof(ThreadArgRetval)) static char
45 thread_arg_retval_placeholder[sizeof(ThreadArgRetval)];
46 thread_arg_retval = new (thread_arg_retval_placeholder) ThreadArgRetval();
47}
48
49ThreadArgRetval &GetThreadArgRetval() { return *thread_arg_retval; }
50
51ThreadContextLsanBase::ThreadContextLsanBase(int tid)
52 : ThreadContextBase(tid) {}
53
54void ThreadContextLsanBase::OnStarted(void *arg) {
55 SetCurrentThread(this);
56 AllocatorThreadStart();
57}
58
59void ThreadContextLsanBase::OnFinished() {
60 AllocatorThreadFinish();
61 DTLS_Destroy();
62 SetCurrentThread(nullptr);
63}
64
65u32 ThreadCreate(u32 parent_tid, bool detached, void *arg) {
66 return thread_registry->CreateThread(user_id: 0, detached, parent_tid, arg);
67}
68
69void ThreadContextLsanBase::ThreadStart(u32 tid, tid_t os_id,
70 ThreadType thread_type, void *arg) {
71 thread_registry->StartThread(tid, os_id, thread_type, arg);
72}
73
74void ThreadFinish() { thread_registry->FinishThread(tid: GetCurrentThreadId()); }
75
76void EnsureMainThreadIDIsCorrect() {
77 if (GetCurrentThreadId() == kMainTid)
78 GetCurrentThread()->os_id = GetTid();
79}
80
81///// Interface to the common LSan module. /////
82
83void GetThreadExtraStackRangesLocked(tid_t os_id,
84 InternalMmapVector<Range> *ranges) {}
85void GetThreadExtraStackRangesLocked(InternalMmapVector<Range> *ranges) {}
86
87void LockThreads() {
88 thread_registry->Lock();
89 thread_arg_retval->Lock();
90}
91
92void UnlockThreads() {
93 thread_arg_retval->Unlock();
94 thread_registry->Unlock();
95}
96
97ThreadRegistry *GetLsanThreadRegistryLocked() {
98 thread_registry->CheckLocked();
99 return thread_registry;
100}
101
102void GetRunningThreadsLocked(InternalMmapVector<tid_t> *threads) {
103 GetLsanThreadRegistryLocked()->RunCallbackForEachThreadLocked(
104 cb: [](ThreadContextBase *tctx, void *threads) {
105 if (tctx->status == ThreadStatusRunning) {
106 reinterpret_cast<InternalMmapVector<tid_t> *>(threads)->push_back(
107 element: tctx->os_id);
108 }
109 },
110 arg: threads);
111}
112
113void PrintThreads() {
114 InternalScopedString out;
115 PrintThreadHistory(registry&: *thread_registry, out);
116 Report(format: "%s\n", out.data());
117}
118
119void GetAdditionalThreadContextPtrsLocked(InternalMmapVector<uptr> *ptrs) {
120 GetThreadArgRetval().GetAllPtrsLocked(ptrs);
121}
122
123} // namespace __lsan
124