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
20namespace __dfsan {
21
22class 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
75DFsanThread *GetCurrentThread();
76void SetCurrentThread(DFsanThread *t);
77void DFsanTSDInit(void (*destructor)(void *tsd));
78void DFsanTSDDtor(void *tsd);
79
80} // namespace __dfsan
81
82#endif // DFSAN_THREAD_H
83