1 //===-- NativeThreadLinux.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 #ifndef liblldb_NativeThreadLinux_H_
11 #define liblldb_NativeThreadLinux_H_
12 
13 #include "SingleStepCheck.h"
14 #include "lldb/Host/common/NativeThreadProtocol.h"
15 #include "lldb/lldb-private-forward.h"
16 
17 #include <map>
18 #include <memory>
19 #include <string>
20 
21 namespace lldb_private {
22 namespace process_linux {
23 
24 class NativeProcessLinux;
25 
26 class NativeThreadLinux : public NativeThreadProtocol {
27   friend class NativeProcessLinux;
28 
29 public:
30   NativeThreadLinux(NativeProcessLinux *process, lldb::tid_t tid);
31 
32   // ---------------------------------------------------------------------
33   // NativeThreadProtocol Interface
34   // ---------------------------------------------------------------------
35   std::string GetName() override;
36 
37   lldb::StateType GetState() override;
38 
39   bool GetStopReason(ThreadStopInfo &stop_info,
40                      std::string &description) override;
41 
42   NativeRegisterContextSP GetRegisterContext() override;
43 
44   Error SetWatchpoint(lldb::addr_t addr, size_t size, uint32_t watch_flags,
45                       bool hardware) override;
46 
47   Error RemoveWatchpoint(lldb::addr_t addr) override;
48 
49 private:
50   // ---------------------------------------------------------------------
51   // Interface for friend classes
52   // ---------------------------------------------------------------------
53 
54   /// Resumes the thread.  If @p signo is anything but
55   /// LLDB_INVALID_SIGNAL_NUMBER, deliver that signal to the thread.
56   Error Resume(uint32_t signo);
57 
58   /// Single steps the thread.  If @p signo is anything but
59   /// LLDB_INVALID_SIGNAL_NUMBER, deliver that signal to the thread.
60   Error SingleStep(uint32_t signo);
61 
62   void SetStoppedBySignal(uint32_t signo, const siginfo_t *info = nullptr);
63 
64   /// Return true if the thread is stopped.
65   /// If stopped by a signal, indicate the signo in the signo argument.
66   /// Otherwise, return LLDB_INVALID_SIGNAL_NUMBER.
67   bool IsStopped(int *signo);
68 
69   void SetStoppedByExec();
70 
71   void SetStoppedByBreakpoint();
72 
73   void SetStoppedByWatchpoint(uint32_t wp_index);
74 
75   bool IsStoppedAtBreakpoint();
76 
77   bool IsStoppedAtWatchpoint();
78 
79   void SetStoppedByTrace();
80 
81   void SetStoppedWithNoReason();
82 
83   void SetExited();
84 
85   Error RequestStop();
86 
87   // ---------------------------------------------------------------------
88   // Private interface
89   // ---------------------------------------------------------------------
90   void MaybeLogStateChange(lldb::StateType new_state);
91 
92   NativeProcessLinux &GetProcess();
93 
94   void SetStopped();
95 
96   // ---------------------------------------------------------------------
97   // Member Variables
98   // ---------------------------------------------------------------------
99   lldb::StateType m_state;
100   ThreadStopInfo m_stop_info;
101   NativeRegisterContextSP m_reg_context_sp;
102   std::string m_stop_description;
103   using WatchpointIndexMap = std::map<lldb::addr_t, uint32_t>;
104   WatchpointIndexMap m_watchpoint_index_map;
105   llvm::Optional<SingleStepWorkaround> m_step_workaround;
106 };
107 
108 typedef std::shared_ptr<NativeThreadLinux> NativeThreadLinuxSP;
109 } // namespace process_linux
110 } // namespace lldb_private
111 
112 #endif // #ifndef liblldb_NativeThreadLinux_H_
113