1 //=-- lsan_thread.cc ------------------------------------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file is a part of LeakSanitizer.
11 // See lsan_thread.h for details.
12 //
13 //===----------------------------------------------------------------------===//
14
15 #include "lsan_thread.h"
16
17 #include "sanitizer_common/sanitizer_common.h"
18 #include "sanitizer_common/sanitizer_placement_new.h"
19 #include "sanitizer_common/sanitizer_thread_registry.h"
20 #include "sanitizer_common/sanitizer_tls_get_addr.h"
21 #include "lsan_allocator.h"
22
23 namespace __lsan {
24
25 const u32 kInvalidTid = (u32) -1;
26
27 static ThreadRegistry *thread_registry;
28 static THREADLOCAL u32 current_thread_tid = kInvalidTid;
29
CreateThreadContext(u32 tid)30 static ThreadContextBase *CreateThreadContext(u32 tid) {
31 void *mem = MmapOrDie(sizeof(ThreadContext), "ThreadContext");
32 return new(mem) ThreadContext(tid);
33 }
34
35 static const uptr kMaxThreads = 1 << 13;
36 static const uptr kThreadQuarantineSize = 64;
37
InitializeThreadRegistry()38 void InitializeThreadRegistry() {
39 static char thread_registry_placeholder[sizeof(ThreadRegistry)] ALIGNED(64);
40 thread_registry = new(thread_registry_placeholder)
41 ThreadRegistry(CreateThreadContext, kMaxThreads, kThreadQuarantineSize);
42 }
43
GetCurrentThread()44 u32 GetCurrentThread() {
45 return current_thread_tid;
46 }
47
SetCurrentThread(u32 tid)48 void SetCurrentThread(u32 tid) {
49 current_thread_tid = tid;
50 }
51
ThreadContext(int tid)52 ThreadContext::ThreadContext(int tid)
53 : ThreadContextBase(tid),
54 stack_begin_(0),
55 stack_end_(0),
56 cache_begin_(0),
57 cache_end_(0),
58 tls_begin_(0),
59 tls_end_(0),
60 dtls_(nullptr) {}
61
62 struct OnStartedArgs {
63 uptr stack_begin, stack_end,
64 cache_begin, cache_end,
65 tls_begin, tls_end;
66 DTLS *dtls;
67 };
68
OnStarted(void * arg)69 void ThreadContext::OnStarted(void *arg) {
70 OnStartedArgs *args = reinterpret_cast<OnStartedArgs *>(arg);
71 stack_begin_ = args->stack_begin;
72 stack_end_ = args->stack_end;
73 tls_begin_ = args->tls_begin;
74 tls_end_ = args->tls_end;
75 cache_begin_ = args->cache_begin;
76 cache_end_ = args->cache_end;
77 dtls_ = args->dtls;
78 }
79
OnFinished()80 void ThreadContext::OnFinished() {
81 AllocatorThreadFinish();
82 DTLS_Destroy();
83 }
84
ThreadCreate(u32 parent_tid,uptr user_id,bool detached)85 u32 ThreadCreate(u32 parent_tid, uptr user_id, bool detached) {
86 return thread_registry->CreateThread(user_id, detached, parent_tid,
87 /* arg */ nullptr);
88 }
89
ThreadStart(u32 tid,uptr os_id)90 void ThreadStart(u32 tid, uptr os_id) {
91 OnStartedArgs args;
92 uptr stack_size = 0;
93 uptr tls_size = 0;
94 GetThreadStackAndTls(tid == 0, &args.stack_begin, &stack_size,
95 &args.tls_begin, &tls_size);
96 args.stack_end = args.stack_begin + stack_size;
97 args.tls_end = args.tls_begin + tls_size;
98 GetAllocatorCacheRange(&args.cache_begin, &args.cache_end);
99 args.dtls = DTLS_Get();
100 thread_registry->StartThread(tid, os_id, &args);
101 }
102
ThreadFinish()103 void ThreadFinish() {
104 thread_registry->FinishThread(GetCurrentThread());
105 }
106
CurrentThreadContext()107 ThreadContext *CurrentThreadContext() {
108 if (!thread_registry) return nullptr;
109 if (GetCurrentThread() == kInvalidTid)
110 return nullptr;
111 // No lock needed when getting current thread.
112 return (ThreadContext *)thread_registry->GetThreadLocked(GetCurrentThread());
113 }
114
FindThreadByUid(ThreadContextBase * tctx,void * arg)115 static bool FindThreadByUid(ThreadContextBase *tctx, void *arg) {
116 uptr uid = (uptr)arg;
117 if (tctx->user_id == uid && tctx->status != ThreadStatusInvalid) {
118 return true;
119 }
120 return false;
121 }
122
ThreadTid(uptr uid)123 u32 ThreadTid(uptr uid) {
124 return thread_registry->FindThread(FindThreadByUid, (void*)uid);
125 }
126
ThreadJoin(u32 tid)127 void ThreadJoin(u32 tid) {
128 CHECK_NE(tid, kInvalidTid);
129 thread_registry->JoinThread(tid, /* arg */nullptr);
130 }
131
EnsureMainThreadIDIsCorrect()132 void EnsureMainThreadIDIsCorrect() {
133 if (GetCurrentThread() == 0)
134 CurrentThreadContext()->os_id = GetTid();
135 }
136
137 ///// Interface to the common LSan module. /////
138
GetThreadRangesLocked(uptr os_id,uptr * stack_begin,uptr * stack_end,uptr * tls_begin,uptr * tls_end,uptr * cache_begin,uptr * cache_end,DTLS ** dtls)139 bool GetThreadRangesLocked(uptr os_id, uptr *stack_begin, uptr *stack_end,
140 uptr *tls_begin, uptr *tls_end, uptr *cache_begin,
141 uptr *cache_end, DTLS **dtls) {
142 ThreadContext *context = static_cast<ThreadContext *>(
143 thread_registry->FindThreadContextByOsIDLocked(os_id));
144 if (!context) return false;
145 *stack_begin = context->stack_begin();
146 *stack_end = context->stack_end();
147 *tls_begin = context->tls_begin();
148 *tls_end = context->tls_end();
149 *cache_begin = context->cache_begin();
150 *cache_end = context->cache_end();
151 *dtls = context->dtls();
152 return true;
153 }
154
ForEachExtraStackRange(uptr os_id,RangeIteratorCallback callback,void * arg)155 void ForEachExtraStackRange(uptr os_id, RangeIteratorCallback callback,
156 void *arg) {
157 }
158
LockThreadRegistry()159 void LockThreadRegistry() {
160 thread_registry->Lock();
161 }
162
UnlockThreadRegistry()163 void UnlockThreadRegistry() {
164 thread_registry->Unlock();
165 }
166
167 } // namespace __lsan
168