1 //===-- msan_thread.h -------------------------------------------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file is a part of MemorySanitizer.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #ifndef MSAN_THREAD_H
14 #define MSAN_THREAD_H
15 
16 #include "msan_allocator.h"
17 #include "sanitizer_common/sanitizer_common.h"
18 
19 namespace __msan {
20 
21 class MsanThread {
22  public:
23   static MsanThread *Create(thread_callback_t start_routine, void *arg);
24   static void TSDDtor(void *tsd);
25   void Destroy();
26 
27   void Init();  // Should be called from the thread itself.
28   thread_return_t ThreadStart();
29 
30   uptr stack_top() { return stack_top_; }
31   uptr stack_bottom() { return stack_bottom_; }
32   uptr tls_begin() { return tls_begin_; }
33   uptr tls_end() { return tls_end_; }
34   bool IsMainThread() { return start_routine_ == nullptr; }
35 
36   bool AddrIsInStack(uptr addr) {
37     return addr >= stack_bottom_ && addr < stack_top_;
38   }
39 
40   bool InSignalHandler() { return in_signal_handler_; }
41   void EnterSignalHandler() { in_signal_handler_++; }
42   void LeaveSignalHandler() { in_signal_handler_--; }
43 
44   MsanThreadLocalMallocStorage &malloc_storage() { return malloc_storage_; }
45 
46   int destructor_iterations_;
47 
48  private:
49   // NOTE: There is no MsanThread constructor. It is allocated
50   // via mmap() and *must* be valid in zero-initialized state.
51   void SetThreadStackAndTls();
52   void ClearShadowForThreadStackAndTLS();
53   thread_callback_t start_routine_;
54   void *arg_;
55   uptr stack_top_;
56   uptr stack_bottom_;
57   uptr tls_begin_;
58   uptr tls_end_;
59 
60   unsigned in_signal_handler_;
61 
62   MsanThreadLocalMallocStorage malloc_storage_;
63 };
64 
65 MsanThread *GetCurrentThread();
66 void SetCurrentThread(MsanThread *t);
67 
68 } // namespace __msan
69 
70 #endif // MSAN_THREAD_H
71