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1a4d82fc JJ |
1 | //===-- sanitizer_stoptheworld.h --------------------------------*- C++ -*-===// |
2 | // | |
3 | // The LLVM Compiler Infrastructure | |
4 | // | |
5 | // This file is distributed under the University of Illinois Open Source | |
6 | // License. See LICENSE.TXT for details. | |
7 | // | |
8 | //===----------------------------------------------------------------------===// | |
9 | // | |
10 | // Defines the StopTheWorld function which suspends the execution of the current | |
11 | // process and runs the user-supplied callback in the same address space. | |
12 | // | |
13 | //===----------------------------------------------------------------------===// | |
14 | #ifndef SANITIZER_STOPTHEWORLD_H | |
15 | #define SANITIZER_STOPTHEWORLD_H | |
16 | ||
17 | #include "sanitizer_internal_defs.h" | |
18 | #include "sanitizer_common.h" | |
19 | ||
20 | namespace __sanitizer { | |
21 | typedef int SuspendedThreadID; | |
22 | ||
23 | // Holds the list of suspended threads and provides an interface to dump their | |
24 | // register contexts. | |
25 | class SuspendedThreadsList { | |
26 | public: | |
27 | SuspendedThreadsList() | |
28 | : thread_ids_(1024) {} | |
29 | SuspendedThreadID GetThreadID(uptr index) const { | |
30 | CHECK_LT(index, thread_ids_.size()); | |
31 | return thread_ids_[index]; | |
32 | } | |
33 | int GetRegistersAndSP(uptr index, uptr *buffer, uptr *sp) const; | |
34 | // The buffer in GetRegistersAndSP should be at least this big. | |
35 | static uptr RegisterCount(); | |
36 | uptr thread_count() const { return thread_ids_.size(); } | |
37 | bool Contains(SuspendedThreadID thread_id) const { | |
38 | for (uptr i = 0; i < thread_ids_.size(); i++) { | |
39 | if (thread_ids_[i] == thread_id) | |
40 | return true; | |
41 | } | |
42 | return false; | |
43 | } | |
44 | void Append(SuspendedThreadID thread_id) { | |
45 | thread_ids_.push_back(thread_id); | |
46 | } | |
47 | ||
48 | private: | |
49 | InternalMmapVector<SuspendedThreadID> thread_ids_; | |
50 | ||
51 | // Prohibit copy and assign. | |
52 | SuspendedThreadsList(const SuspendedThreadsList&); | |
53 | void operator=(const SuspendedThreadsList&); | |
54 | }; | |
55 | ||
56 | typedef void (*StopTheWorldCallback)( | |
57 | const SuspendedThreadsList &suspended_threads_list, | |
58 | void *argument); | |
59 | ||
60 | // Suspend all threads in the current process and run the callback on the list | |
61 | // of suspended threads. This function will resume the threads before returning. | |
92a42be0 SL |
62 | // The callback should not call any libc functions. The callback must not call |
63 | // exit() nor _exit() and instead return to the caller. | |
1a4d82fc JJ |
64 | // This function should NOT be called from multiple threads simultaneously. |
65 | void StopTheWorld(StopTheWorldCallback callback, void *argument); | |
66 | ||
67 | } // namespace __sanitizer | |
68 | ||
69 | #endif // SANITIZER_STOPTHEWORLD_H |