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