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 "lsan_allocator.h"
  19
  20 namespace __lsan {
  21
  22 const u32 kInvalidTid = (u32) -1;
  23
  24 static ThreadRegistry *thread_registry;
  25 static THREADLOCAL u32 current_thread_tid = kInvalidTid;
  26
  27 static ThreadContextBase *CreateThreadContext(u32 tid) {
  28   void *mem = MmapOrDie(sizeof(ThreadContext), "ThreadContext");
  29   return new(mem) ThreadContext(tid);
  30 }
  31
  32 static const uptr kMaxThreads = 1 << 13;
  33 static const uptr kThreadQuarantineSize = 64;
  34
  35 void InitializeThreadRegistry() {
  36   static char thread_registry_placeholder[sizeof(ThreadRegistry)] ALIGNED(64);
  37   thread_registry = new(thread_registry_placeholder)
  38     ThreadRegistry(CreateThreadContext, kMaxThreads, kThreadQuarantineSize);
  39 }
  40
  41 u32 GetCurrentThread() {
  42   return current_thread_tid;
  43 }
  44
  45 void SetCurrentThread(u32 tid) {
  46   current_thread_tid = tid;
  47 }
  48
  49 ThreadContext::ThreadContext(int tid)
  50   : ThreadContextBase(tid),
  51     stack_begin_(0),
  52     stack_end_(0),
  53     cache_begin_(0),
  54     cache_end_(0),
  55     tls_begin_(0),
  56     tls_end_(0) {}
  57
  58 struct OnStartedArgs {
  59   uptr stack_begin, stack_end,
  60        cache_begin, cache_end,
  61        tls_begin, tls_end;
  62 };
  63
  64 void ThreadContext::OnStarted(void *arg) {
  65   OnStartedArgs *args = reinterpret_cast<OnStartedArgs *>(arg);
  66   stack_begin_ = args->stack_begin;
  67   stack_end_ = args->stack_end;
  68   tls_begin_ = args->tls_begin;
  69   tls_end_ = args->tls_end;
  70   cache_begin_ = args->cache_begin;
  71   cache_end_ = args->cache_end;
  72 }
  73
  74 void ThreadContext::OnFinished() {
  75   AllocatorThreadFinish();
  76 }
  77
  78 u32 ThreadCreate(u32 parent_tid, uptr user_id, bool detached) {
  79   return thread_registry->CreateThread(user_id, detached, parent_tid,
  80                                        /* arg */ nullptr);
  81 }
  82
  83 void ThreadStart(u32 tid, uptr os_id) {
  84   OnStartedArgs args;
  85   uptr stack_size = 0;
  86   uptr tls_size = 0;
  87   GetThreadStackAndTls(tid == 0, &args.stack_begin, &stack_size,
  88                        &args.tls_begin, &tls_size);
  89   args.stack_end = args.stack_begin + stack_size;
  90   args.tls_end = args.tls_begin + tls_size;
  91   GetAllocatorCacheRange(&args.cache_begin, &args.cache_end);
  92   thread_registry->StartThread(tid, os_id, &args);
  93 }
  94
  95 void ThreadFinish() {
  96   thread_registry->FinishThread(GetCurrentThread());
  97 }
  98
  99 ThreadContext *CurrentThreadContext() {
 100   if (!thread_registry) return nullptr;
 101   if (GetCurrentThread() == kInvalidTid)
 102     return nullptr;
 103   // No lock needed when getting current thread.
 104   return (ThreadContext *)thread_registry->GetThreadLocked(GetCurrentThread());
 105 }
 106
 107 static bool FindThreadByUid(ThreadContextBase *tctx, void *arg) {
 108   uptr uid = (uptr)arg;
 109   if (tctx->user_id == uid && tctx->status != ThreadStatusInvalid) {
 110     return true;
 111   }
 112   return false;
 113 }
 114
 115 u32 ThreadTid(uptr uid) {
 116   return thread_registry->FindThread(FindThreadByUid, (void*)uid);
 117 }
 118
 119 void ThreadJoin(u32 tid) {
 120   CHECK_NE(tid, kInvalidTid);
 121   thread_registry->JoinThread(tid, /* arg */nullptr);
 122 }
 123
 124 void EnsureMainThreadIDIsCorrect() {
 125   if (GetCurrentThread() == 0)
 126     CurrentThreadContext()->os_id = GetTid();
 127 }
 128
 129 ///// Interface to the common LSan module. /////
 130
 131 bool GetThreadRangesLocked(uptr os_id, uptr *stack_begin, uptr *stack_end,
 132                            uptr *tls_begin, uptr *tls_end,
 133                            uptr *cache_begin, uptr *cache_end) {
 134   ThreadContext *context = static_cast<ThreadContext *>(
 135       thread_registry->FindThreadContextByOsIDLocked(os_id));
 136   if (!context) return false;
 137   *stack_begin = context->stack_begin();
 138   *stack_end = context->stack_end();
 139   *tls_begin = context->tls_begin();
 140   *tls_end = context->tls_end();
 141   *cache_begin = context->cache_begin();
 142   *cache_end = context->cache_end();
 143   return true;
 144 }
 145
 146 void ForEachExtraStackRange(uptr os_id, RangeIteratorCallback callback,
 147                             void *arg) {
 148 }
 149
 150 void LockThreadRegistry() {
 151   thread_registry->Lock();
 152 }
 153
 154 void UnlockThreadRegistry() {
 155   thread_registry->Unlock();
 156 }
 157
 158 } // namespace __lsan