src/compiler-rt/lib/msan/msan_thread.h

   1 //===-- msan_thread.h -------------------------------------------*- C++ -*-===//
   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 MemorySanitizer.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef MSAN_THREAD_H
  15 #define MSAN_THREAD_H
  16
  17 #include "msan_allocator.h"
  18 #include "sanitizer_common/sanitizer_common.h"
  19
  20 namespace __msan {
  21
  22 class MsanThread {
  23  public:
  24   static MsanThread *Create(thread_callback_t start_routine, void *arg);
  25   static void TSDDtor(void *tsd);
  26   void Destroy();
  27
  28   void Init();  // Should be called from the thread itself.
  29   thread_return_t ThreadStart();
  30
  31   uptr stack_top() { return stack_top_; }
  32   uptr stack_bottom() { return stack_bottom_; }
  33   uptr tls_begin() { return tls_begin_; }
  34   uptr tls_end() { return tls_end_; }
  35   bool IsMainThread() { return start_routine_ == nullptr; }
  36
  37   bool AddrIsInStack(uptr addr) {
  38     return addr >= stack_bottom_ && addr < stack_top_;
  39   }
  40
  41   bool InSignalHandler() { return in_signal_handler_; }
  42   void EnterSignalHandler() { in_signal_handler_++; }
  43   void LeaveSignalHandler() { in_signal_handler_--; }
  44
  45   MsanThreadLocalMallocStorage &malloc_storage() { return malloc_storage_; }
  46
  47   int destructor_iterations_;
  48
  49  private:
  50   // NOTE: There is no MsanThread constructor. It is allocated
  51   // via mmap() and *must* be valid in zero-initialized state.
  52   void SetThreadStackAndTls();
  53   void ClearShadowForThreadStackAndTLS();
  54   thread_callback_t start_routine_;
  55   void *arg_;
  56   uptr stack_top_;
  57   uptr stack_bottom_;
  58   uptr tls_begin_;
  59   uptr tls_end_;
  60
  61   unsigned in_signal_handler_;
  62
  63   MsanThreadLocalMallocStorage malloc_storage_;
  64 };
  65
  66 MsanThread *GetCurrentThread();
  67 void SetCurrentThread(MsanThread *t);
  68
  69 } // namespace __msan
  70
  71 #endif // MSAN_THREAD_H