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
  21 namespace __lsan {
  22
  23 const u32 kInvalidTid = (u32) -1;
  24
  25 static ThreadRegistry *thread_registry;
  26 static THREADLOCAL u32 current_thread_tid = kInvalidTid;
  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 u32 GetCurrentThread() {
  43   return current_thread_tid;
  44 }
  45
  46 void SetCurrentThread(u32 tid) {
  47   current_thread_tid = tid;
  48 }
  49
  50 ThreadContext::ThreadContext(int tid)
  51     : ThreadContextBase(tid),
  52       stack_begin_(0),
  53       stack_end_(0),
  54       cache_begin_(0),
  55       cache_end_(0),
  56       tls_begin_(0),
  57       tls_end_(0),
  58       dtls_(nullptr) {}
  59
  60 struct OnStartedArgs {
  61   uptr stack_begin, stack_end,
  62        cache_begin, cache_end,
  63        tls_begin, tls_end;
  64   DTLS *dtls;
  65 };
  66
  67 void ThreadContext::OnStarted(void *arg) {
  68   OnStartedArgs *args = reinterpret_cast<OnStartedArgs *>(arg);
  69   stack_begin_ = args->stack_begin;
  70   stack_end_ = args->stack_end;
  71   tls_begin_ = args->tls_begin;
  72   tls_end_ = args->tls_end;
  73   cache_begin_ = args->cache_begin;
  74   cache_end_ = args->cache_end;
  75   dtls_ = args->dtls;
  76 }
  77
  78 void ThreadContext::OnFinished() {
  79   AllocatorThreadFinish();
  80   DTLS_Destroy();
  81 }
  82
  83 u32 ThreadCreate(u32 parent_tid, uptr user_id, bool detached) {
  84   return thread_registry->CreateThread(user_id, detached, parent_tid,
  85                                        /* arg */ nullptr);
  86 }
  87
  88 void ThreadStart(u32 tid, uptr os_id) {
  89   OnStartedArgs args;
  90   uptr stack_size = 0;
  91   uptr tls_size = 0;
  92   GetThreadStackAndTls(tid == 0, &args.stack_begin, &stack_size,
  93                        &args.tls_begin, &tls_size);
  94   args.stack_end = args.stack_begin + stack_size;
  95   args.tls_end = args.tls_begin + tls_size;
  96   GetAllocatorCacheRange(&args.cache_begin, &args.cache_end);
  97   args.dtls = DTLS_Get();
  98   thread_registry->StartThread(tid, os_id, &args);
  99 }
 100
 101 void ThreadFinish() {
 102   thread_registry->FinishThread(GetCurrentThread());
 103 }
 104
 105 ThreadContext *CurrentThreadContext() {
 106   if (!thread_registry) return nullptr;
 107   if (GetCurrentThread() == kInvalidTid)
 108     return nullptr;
 109   // No lock needed when getting current thread.
 110   return (ThreadContext *)thread_registry->GetThreadLocked(GetCurrentThread());
 111 }
 112
 113 static bool FindThreadByUid(ThreadContextBase *tctx, void *arg) {
 114   uptr uid = (uptr)arg;
 115   if (tctx->user_id == uid && tctx->status != ThreadStatusInvalid) {
 116     return true;
 117   }
 118   return false;
 119 }
 120
 121 u32 ThreadTid(uptr uid) {
 122   return thread_registry->FindThread(FindThreadByUid, (void*)uid);
 123 }
 124
 125 void ThreadJoin(u32 tid) {
 126   CHECK_NE(tid, kInvalidTid);
 127   thread_registry->JoinThread(tid, /* arg */nullptr);
 128 }
 129
 130 void EnsureMainThreadIDIsCorrect() {
 131   if (GetCurrentThread() == 0)
 132     CurrentThreadContext()->os_id = GetTid();
 133 }
 134
 135 ///// Interface to the common LSan module. /////
 136
 137 bool GetThreadRangesLocked(uptr os_id, uptr *stack_begin, uptr *stack_end,
 138                            uptr *tls_begin, uptr *tls_end, uptr *cache_begin,
 139                            uptr *cache_end, DTLS **dtls) {
 140   ThreadContext *context = static_cast<ThreadContext *>(
 141       thread_registry->FindThreadContextByOsIDLocked(os_id));
 142   if (!context) return false;
 143   *stack_begin = context->stack_begin();
 144   *stack_end = context->stack_end();
 145   *tls_begin = context->tls_begin();
 146   *tls_end = context->tls_end();
 147   *cache_begin = context->cache_begin();
 148   *cache_end = context->cache_end();
 149   *dtls = context->dtls();
 150   return true;
 151 }
 152
 153 void ForEachExtraStackRange(uptr os_id, RangeIteratorCallback callback,
 154                             void *arg) {
 155 }
 156
 157 void LockThreadRegistry() {
 158   thread_registry->Lock();
 159 }
 160
 161 void UnlockThreadRegistry() {
 162   thread_registry->Unlock();
 163 }
 164
 165 } // namespace __lsan