libsanitizer/lsan/lsan_thread.cpp

   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 static const uptr kMaxThreads = 1 << 13;
  34 static const uptr kThreadQuarantineSize = 64;
  35
  36 void InitializeThreadRegistry() {
  37   static ALIGNED(64) char thread_registry_placeholder[sizeof(ThreadRegistry)];
  38   thread_registry = new (thread_registry_placeholder)
  39       ThreadRegistry(CreateThreadContext, kMaxThreads, kThreadQuarantineSize);
  40 }
  41
  42 ThreadContextLsanBase::ThreadContextLsanBase(int tid)
  43     : ThreadContextBase(tid) {}
  44
  45 void ThreadContextLsanBase::OnFinished() {
  46   AllocatorThreadFinish();
  47   DTLS_Destroy();
  48 }
  49
  50 u32 ThreadCreate(u32 parent_tid, uptr user_id, bool detached, void *arg) {
  51   return thread_registry->CreateThread(user_id, detached, parent_tid, arg);
  52 }
  53
  54 void ThreadContextLsanBase::ThreadStart(u32 tid, tid_t os_id,
  55                                         ThreadType thread_type, void *arg) {
  56   thread_registry->StartThread(tid, os_id, thread_type, arg);
  57   SetCurrentThread(tid);
  58 }
  59
  60 void ThreadFinish() {
  61   thread_registry->FinishThread(GetCurrentThread());
  62   SetCurrentThread(kInvalidTid);
  63 }
  64
  65 ThreadContext *CurrentThreadContext() {
  66   if (!thread_registry)
  67     return nullptr;
  68   if (GetCurrentThread() == kInvalidTid)
  69     return nullptr;
  70   // No lock needed when getting current thread.
  71   return (ThreadContext *)thread_registry->GetThreadLocked(GetCurrentThread());
  72 }
  73
  74 static bool FindThreadByUid(ThreadContextBase *tctx, void *arg) {
  75   uptr uid = (uptr)arg;
  76   if (tctx->user_id == uid && tctx->status != ThreadStatusInvalid) {
  77     return true;
  78   }
  79   return false;
  80 }
  81
  82 u32 ThreadTid(uptr uid) {
  83   return thread_registry->FindThread(FindThreadByUid, (void *)uid);
  84 }
  85
  86 void ThreadJoin(u32 tid) {
  87   CHECK_NE(tid, kInvalidTid);
  88   thread_registry->JoinThread(tid, /* arg */ nullptr);
  89 }
  90
  91 void EnsureMainThreadIDIsCorrect() {
  92   if (GetCurrentThread() == 0)
  93     CurrentThreadContext()->os_id = GetTid();
  94 }
  95
  96 ///// Interface to the common LSan module. /////
  97
  98 void ForEachExtraStackRange(tid_t os_id, RangeIteratorCallback callback,
  99                             void *arg) {}
 100
 101 void LockThreadRegistry() { thread_registry->Lock(); }
 102
 103 void UnlockThreadRegistry() { thread_registry->Unlock(); }
 104
 105 ThreadRegistry *GetThreadRegistryLocked() {
 106   thread_registry->CheckLocked();
 107   return thread_registry;
 108 }
 109
 110 }  // namespace __lsan