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   Error SetHardwareBreakpoint(lldb::addr_t addr, size_t size) override;
50 
51   Error RemoveHardwareBreakpoint(lldb::addr_t addr) override;
52 
53 private:
54   // ---------------------------------------------------------------------
55   // Interface for friend classes
56   // ---------------------------------------------------------------------
57 
58   /// Resumes the thread.  If @p signo is anything but
59   /// LLDB_INVALID_SIGNAL_NUMBER, deliver that signal to the thread.
60   Error Resume(uint32_t signo);
61 
62   /// Single steps the thread.  If @p signo is anything but
63   /// LLDB_INVALID_SIGNAL_NUMBER, deliver that signal to the thread.
64   Error SingleStep(uint32_t signo);
65 
66   void SetStoppedBySignal(uint32_t signo, const siginfo_t *info = nullptr);
67 
68   /// Return true if the thread is stopped.
69   /// If stopped by a signal, indicate the signo in the signo argument.
70   /// Otherwise, return LLDB_INVALID_SIGNAL_NUMBER.
71   bool IsStopped(int *signo);
72 
73   void SetStoppedByExec();
74 
75   void SetStoppedByBreakpoint();
76 
77   void SetStoppedByWatchpoint(uint32_t wp_index);
78 
79   bool IsStoppedAtBreakpoint();
80 
81   bool IsStoppedAtWatchpoint();
82 
83   void SetStoppedByTrace();
84 
85   void SetStoppedWithNoReason();
86 
87   void SetExited();
88 
89   Error RequestStop();
90 
91   // ---------------------------------------------------------------------
92   // Private interface
93   // ---------------------------------------------------------------------
94   void MaybeLogStateChange(lldb::StateType new_state);
95 
96   NativeProcessLinux &GetProcess();
97 
98   void SetStopped();
99 
100   // ---------------------------------------------------------------------
101   // Member Variables
102   // ---------------------------------------------------------------------
103   lldb::StateType m_state;
104   ThreadStopInfo m_stop_info;
105   NativeRegisterContextSP m_reg_context_sp;
106   std::string m_stop_description;
107   using WatchpointIndexMap = std::map<lldb::addr_t, uint32_t>;
108   WatchpointIndexMap m_watchpoint_index_map;
109   WatchpointIndexMap m_hw_break_index_map;
110   std::unique_ptr<SingleStepWorkaround> m_step_workaround;
111 };
112 
113 typedef std::shared_ptr<NativeThreadLinux> NativeThreadLinuxSP;
114 } // namespace process_linux
115 } // namespace lldb_private
116 
117 #endif // #ifndef liblldb_NativeThreadLinux_H_
118