libsanitizer/lsan/lsan_thread.cc

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