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 #include "sanitizer_common/sanitizer_posix.h"
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   __sanitizer_sigset_t starting_sigset_;
49 
50  private:
51   // NOTE: There is no MsanThread constructor. It is allocated
52   // via mmap() and *must* be valid in zero-initialized state.
53   void SetThreadStackAndTls();
54   void ClearShadowForThreadStackAndTLS();
55   struct StackBounds {
56     uptr bottom;
57     uptr top;
58   };
59   StackBounds GetStackBounds() const;
60   thread_callback_t start_routine_;
61   void *arg_;
62 
63   bool stack_switching_;
64 
65   StackBounds stack_;
66   StackBounds next_stack_;
67 
68   uptr tls_begin_;
69   uptr tls_end_;
70 
71   unsigned in_signal_handler_;
72 
73   MsanThreadLocalMallocStorage malloc_storage_;
74 };
75 
76 MsanThread *GetCurrentThread();
77 void SetCurrentThread(MsanThread *t);
78 
79 } // namespace __msan
80 
81 #endif // MSAN_THREAD_H
82