lib/lsan/lsan_thread.cc

   1 //=-- lsan_thread.cc ------------------------------------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file is a part of LeakSanitizer.
  11 // See lsan_thread.h for details.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "lsan_thread.h"
  16
  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 "lsan_allocator.h"
  21
  22 namespace __lsan {
  23
  24 const u32 kInvalidTid = (u32) -1;
  25
  26 static ThreadRegistry *thread_registry;
  27 static THREADLOCAL u32 current_thread_tid = kInvalidTid;
  28
  29 static ThreadContextBase *CreateThreadContext(u32 tid) {
  30   void *mem = MmapOrDie(sizeof(ThreadContext), "ThreadContext");
  31   return new(mem) ThreadContext(tid);
  32 }
  33
  34 static const uptr kMaxThreads = 1 << 13;
  35 static const uptr kThreadQuarantineSize = 64;
  36
  37 void InitializeThreadRegistry() {
  38   static char thread_registry_placeholder[sizeof(ThreadRegistry)] ALIGNED(64);
  39   thread_registry = new(thread_registry_placeholder)
  40     ThreadRegistry(CreateThreadContext, kMaxThreads, kThreadQuarantineSize);
  41 }
  42
  43 u32 GetCurrentThread() {
  44   return current_thread_tid;
  45 }
  46
  47 void SetCurrentThread(u32 tid) {
  48   current_thread_tid = tid;
  49 }
  50
  51 ThreadContext::ThreadContext(int tid)
  52   : ThreadContextBase(tid),
  53     stack_begin_(0),
  54     stack_end_(0),
  55     cache_begin_(0),
  56     cache_end_(0),
  57     tls_begin_(0),
  58     tls_end_(0) {}
  59
  60 struct OnStartedArgs {
  61   uptr stack_begin, stack_end,
  62        cache_begin, cache_end,
  63        tls_begin, tls_end;
  64 };
  65
  66 void ThreadContext::OnStarted(void *arg) {
  67   OnStartedArgs *args = reinterpret_cast<OnStartedArgs *>(arg);
  68   stack_begin_ = args->stack_begin;
  69   stack_end_ = args->stack_end;
  70   tls_begin_ = args->tls_begin;
  71   tls_end_ = args->tls_end;
  72   cache_begin_ = args->cache_begin;
  73   cache_end_ = args->cache_end;
  74 }
  75
  76 void ThreadContext::OnFinished() {
  77   AllocatorThreadFinish();
  78 }
  79
  80 u32 ThreadCreate(u32 parent_tid, uptr user_id, bool detached) {
  81   return thread_registry->CreateThread(user_id, detached, parent_tid,
  82                                        /* arg */ 0);
  83 }
  84
  85 void ThreadStart(u32 tid, uptr os_id) {
  86   OnStartedArgs args;
  87   uptr stack_size = 0;
  88   uptr tls_size = 0;
  89   GetThreadStackAndTls(tid == 0, &args.stack_begin, &stack_size,
  90                        &args.tls_begin, &tls_size);
  91   args.stack_end = args.stack_begin + stack_size;
  92   args.tls_end = args.tls_begin + tls_size;
  93   GetAllocatorCacheRange(&args.cache_begin, &args.cache_end);
  94   thread_registry->StartThread(tid, os_id, &args);
  95 }
  96
  97 void ThreadFinish() {
  98   thread_registry->FinishThread(GetCurrentThread());
  99 }
 100
 101 ThreadContext *CurrentThreadContext() {
 102   if (!thread_registry) return 0;
 103   if (GetCurrentThread() == kInvalidTid)
 104     return 0;
 105   // No lock needed when getting current thread.
 106   return (ThreadContext *)thread_registry->GetThreadLocked(GetCurrentThread());
 107 }
 108
 109 static bool FindThreadByUid(ThreadContextBase *tctx, void *arg) {
 110   uptr uid = (uptr)arg;
 111   if (tctx->user_id == uid && tctx->status != ThreadStatusInvalid) {
 112     return true;
 113   }
 114   return false;
 115 }
 116
 117 u32 ThreadTid(uptr uid) {
 118   return thread_registry->FindThread(FindThreadByUid, (void*)uid);
 119 }
 120
 121 void ThreadJoin(u32 tid) {
 122   CHECK_NE(tid, kInvalidTid);
 123   thread_registry->JoinThread(tid, /* arg */0);
 124 }
 125
 126 void EnsureMainThreadIDIsCorrect() {
 127   if (GetCurrentThread() == 0)
 128     CurrentThreadContext()->os_id = GetTid();
 129 }
 130
 131 ///// Interface to the common LSan module. /////
 132
 133 bool GetThreadRangesLocked(uptr os_id, uptr *stack_begin, uptr *stack_end,
 134                            uptr *tls_begin, uptr *tls_end,
 135                            uptr *cache_begin, uptr *cache_end) {
 136   ThreadContext *context = static_cast<ThreadContext *>(
 137       thread_registry->FindThreadContextByOsIDLocked(os_id));
 138   if (!context) return false;
 139   *stack_begin = context->stack_begin();
 140   *stack_end = context->stack_end();
 141   *tls_begin = context->tls_begin();
 142   *tls_end = context->tls_end();
 143   *cache_begin = context->cache_begin();
 144   *cache_end = context->cache_end();
 145   return true;
 146 }
 147
 148 void ForEachExtraStackRange(uptr os_id, RangeIteratorCallback callback,
 149                             void *arg) {
 150 }
 151
 152 void LockThreadRegistry() {
 153   thread_registry->Lock();
 154 }
 155
 156 void UnlockThreadRegistry() {
 157   thread_registry->Unlock();
 158 }
 159
 160 }  // namespace __lsan