src/libcompiler_builtins/compiler-rt/lib/hwasan/hwasan_thread.h

   1 //===-- hwasan_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 HWAddressSanitizer.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef HWASAN_THREAD_H
  15 #define HWASAN_THREAD_H
  16
  17 #include "hwasan_allocator.h"
  18 #include "sanitizer_common/sanitizer_common.h"
  19
  20 namespace __hwasan {
  21
  22 class HwasanThread {
  23  public:
  24   static HwasanThread *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   bool InSymbolizer() { return in_symbolizer_; }
  46   void EnterSymbolizer() { in_symbolizer_++; }
  47   void LeaveSymbolizer() { in_symbolizer_--; }
  48
  49   bool InInterceptorScope() { return in_interceptor_scope_; }
  50   void EnterInterceptorScope() { in_interceptor_scope_++; }
  51   void LeaveInterceptorScope() { in_interceptor_scope_--; }
  52
  53   HwasanThreadLocalMallocStorage &malloc_storage() { return malloc_storage_; }
  54
  55   int destructor_iterations_;
  56
  57  private:
  58   // NOTE: There is no HwasanThread constructor. It is allocated
  59   // via mmap() and *must* be valid in zero-initialized state.
  60   void SetThreadStackAndTls();
  61   void ClearShadowForThreadStackAndTLS();
  62   thread_callback_t start_routine_;
  63   void *arg_;
  64   uptr stack_top_;
  65   uptr stack_bottom_;
  66   uptr tls_begin_;
  67   uptr tls_end_;
  68
  69   unsigned in_signal_handler_;
  70   unsigned in_symbolizer_;
  71   unsigned in_interceptor_scope_;
  72
  73   HwasanThreadLocalMallocStorage malloc_storage_;
  74 };
  75
  76 HwasanThread *GetCurrentThread();
  77 void SetCurrentThread(HwasanThread *t);
  78
  79 } // namespace __hwasan
  80
  81 #endif // HWASAN_THREAD_H