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