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"
19namespace __msan {
20
21class 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
76MsanThread *GetCurrentThread();
77void SetCurrentThread(MsanThread *t);
78
79} // namespace __msan
80
81#endif // MSAN_THREAD_H
82