1 //===-- dfsan_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 DataFlowSanitizer.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #ifndef DFSAN_THREAD_H
14 #define DFSAN_THREAD_H
15 
16 #include "dfsan_allocator.h"
17 #include "sanitizer_common/sanitizer_common.h"
18 #include "sanitizer_common/sanitizer_posix.h"
19 
20 namespace __dfsan {
21 
22 class DFsanThread {
23  public:
24   // NOTE: There is no DFsanThread constructor. It is allocated
25   // via mmap() and *must* be valid in zero-initialized state.
26 
27   static DFsanThread *Create(thread_callback_t start_routine, void *arg,
28                              bool track_origins = false);
29   static void TSDDtor(void *tsd);
30   void Destroy();
31 
32   void Init();  // Should be called from the thread itself.
33   thread_return_t ThreadStart();
34 
35   uptr stack_top();
36   uptr stack_bottom();
37   uptr tls_begin() { return tls_begin_; }
38   uptr tls_end() { return tls_end_; }
39   bool IsMainThread() { return start_routine_ == nullptr; }
40 
41   bool InSignalHandler() { return in_signal_handler_; }
42   void EnterSignalHandler() { in_signal_handler_++; }
43   void LeaveSignalHandler() { in_signal_handler_--; }
44 
45   DFsanThreadLocalMallocStorage &malloc_storage() { return malloc_storage_; }
46 
47   int destructor_iterations_;
48   __sanitizer_sigset_t starting_sigset_;
49 
50  private:
51   void SetThreadStackAndTls();
52   void ClearShadowForThreadStackAndTLS();
53   struct StackBounds {
54     uptr bottom;
55     uptr top;
56   };
57   StackBounds GetStackBounds() const;
58 
59   bool AddrIsInStack(uptr addr);
60 
61   thread_callback_t start_routine_;
62   void *arg_;
63   bool track_origins_;
64 
65   StackBounds stack_;
66 
67   uptr tls_begin_;
68   uptr tls_end_;
69 
70   unsigned in_signal_handler_;
71 
72   DFsanThreadLocalMallocStorage malloc_storage_;
73 };
74 
75 DFsanThread *GetCurrentThread();
76 void SetCurrentThread(DFsanThread *t);
77 void DFsanTSDInit(void (*destructor)(void *tsd));
78 void DFsanTSDDtor(void *tsd);
79 
80 }  // namespace __dfsan
81 
82 #endif  // DFSAN_THREAD_H
83