1 //=-- lsan_thread.cc ------------------------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file is a part of LeakSanitizer.
11 // See lsan_thread.h for details.
13 //===----------------------------------------------------------------------===//
15 #include "lsan_thread.h"
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"
25 const u32 kInvalidTid = (u32) -1;
27 static ThreadRegistry *thread_registry;
28 static THREADLOCAL u32 current_thread_tid = kInvalidTid;
30 static ThreadContextBase *CreateThreadContext(u32 tid) {
31 void *mem = MmapOrDie(sizeof(ThreadContext), "ThreadContext");
32 return new(mem) ThreadContext(tid);
35 static const uptr kMaxThreads = 1 << 13;
36 static const uptr kThreadQuarantineSize = 64;
38 void InitializeThreadRegistry() {
39 static ALIGNED(64) char thread_registry_placeholder[sizeof(ThreadRegistry)];
40 thread_registry = new(thread_registry_placeholder)
41 ThreadRegistry(CreateThreadContext, kMaxThreads, kThreadQuarantineSize);
44 u32 GetCurrentThread() {
45 return current_thread_tid;
48 void SetCurrentThread(u32 tid) {
49 current_thread_tid = tid;
52 ThreadContext::ThreadContext(int tid)
53 : ThreadContextBase(tid),
62 struct OnStartedArgs {
63 uptr stack_begin, stack_end,
64 cache_begin, cache_end,
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;
80 void ThreadContext::OnFinished() {
81 AllocatorThreadFinish();
85 u32 ThreadCreate(u32 parent_tid, uptr user_id, bool detached) {
86 return thread_registry->CreateThread(user_id, detached, parent_tid,
90 void ThreadStart(u32 tid, uptr os_id) {
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);
103 void ThreadFinish() {
104 thread_registry->FinishThread(GetCurrentThread());
107 ThreadContext *CurrentThreadContext() {
108 if (!thread_registry) return nullptr;
109 if (GetCurrentThread() == kInvalidTid)
111 // No lock needed when getting current thread.
112 return (ThreadContext *)thread_registry->GetThreadLocked(GetCurrentThread());
115 static bool FindThreadByUid(ThreadContextBase *tctx, void *arg) {
116 uptr uid = (uptr)arg;
117 if (tctx->user_id == uid && tctx->status != ThreadStatusInvalid) {
123 u32 ThreadTid(uptr uid) {
124 return thread_registry->FindThread(FindThreadByUid, (void*)uid);
127 void ThreadJoin(u32 tid) {
128 CHECK_NE(tid, kInvalidTid);
129 thread_registry->JoinThread(tid, /* arg */nullptr);
132 void EnsureMainThreadIDIsCorrect() {
133 if (GetCurrentThread() == 0)
134 CurrentThreadContext()->os_id = GetTid();
137 ///// Interface to the common LSan module. /////
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();
155 void ForEachExtraStackRange(uptr os_id, RangeIteratorCallback callback,
159 void LockThreadRegistry() {
160 thread_registry->Lock();
163 void UnlockThreadRegistry() {
164 thread_registry->Unlock();
167 } // namespace __lsan