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();
31   uptr 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 
38   bool InSignalHandler() { return in_signal_handler_; }
39   void EnterSignalHandler() { in_signal_handler_++; }
40   void LeaveSignalHandler() { in_signal_handler_--; }
41 
42   void StartSwitchFiber(uptr bottom, uptr size);
43   void FinishSwitchFiber(uptr *bottom_old, uptr *size_old);
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   struct StackBounds {
55     uptr bottom;
56     uptr top;
57   };
58   StackBounds GetStackBounds() const;
59   thread_callback_t start_routine_;
60   void *arg_;
61 
62   bool stack_switching_;
63 
64   StackBounds stack_;
65   StackBounds next_stack_;
66 
67   uptr tls_begin_;
68   uptr tls_end_;
69 
70   unsigned in_signal_handler_;
71 
72   MsanThreadLocalMallocStorage malloc_storage_;
73 };
74 
75 MsanThread *GetCurrentThread();
76 void SetCurrentThread(MsanThread *t);
77 
78 } // namespace __msan
79 
80 #endif // MSAN_THREAD_H
81