1 //===-- Watchpoint.h --------------------------------------------*- C++ -*-===//
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
7 //===----------------------------------------------------------------------===//
9 #ifndef liblldb_Watchpoint_h_
10 #define liblldb_Watchpoint_h_
15 #include "lldb/Breakpoint/StoppointLocation.h"
16 #include "lldb/Breakpoint/WatchpointOptions.h"
17 #include "lldb/Symbol/CompilerType.h"
18 #include "lldb/Target/Target.h"
19 #include "lldb/Utility/UserID.h"
20 #include "lldb/lldb-private.h"
22 namespace lldb_private {
24 class Watchpoint : public std::enable_shared_from_this<Watchpoint>,
25 public StoppointLocation {
27 class WatchpointEventData : public EventData {
29 WatchpointEventData(lldb::WatchpointEventType sub_type,
30 const lldb::WatchpointSP &new_watchpoint_sp);
32 ~WatchpointEventData() override;
34 static ConstString GetFlavorString();
36 ConstString GetFlavor() const override;
38 lldb::WatchpointEventType GetWatchpointEventType() const;
40 lldb::WatchpointSP &GetWatchpoint();
42 void Dump(Stream *s) const override;
44 static lldb::WatchpointEventType
45 GetWatchpointEventTypeFromEvent(const lldb::EventSP &event_sp);
47 static lldb::WatchpointSP
48 GetWatchpointFromEvent(const lldb::EventSP &event_sp);
50 static const WatchpointEventData *
51 GetEventDataFromEvent(const Event *event_sp);
54 lldb::WatchpointEventType m_watchpoint_event;
55 lldb::WatchpointSP m_new_watchpoint_sp;
57 DISALLOW_COPY_AND_ASSIGN(WatchpointEventData);
60 Watchpoint(Target &target, lldb::addr_t addr, uint32_t size,
61 const CompilerType *type, bool hardware = true);
63 ~Watchpoint() override;
65 void IncrementFalseAlarmsAndReviseHitCount();
67 bool IsEnabled() const;
69 // This doesn't really enable/disable the watchpoint. It is currently just
70 // for use in the Process plugin's {Enable,Disable}Watchpoint, which should
73 void SetEnabled(bool enabled, bool notify = true);
75 bool IsHardware() const override;
77 bool ShouldStop(StoppointCallbackContext *context) override;
79 bool WatchpointRead() const;
80 bool WatchpointWrite() const;
81 uint32_t GetIgnoreCount() const;
82 void SetIgnoreCount(uint32_t n);
83 void SetWatchpointType(uint32_t type, bool notify = true);
84 void SetDeclInfo(const std::string &str);
85 std::string GetWatchSpec();
86 void SetWatchSpec(const std::string &str);
88 // Snapshot management interface.
89 bool IsWatchVariable() const;
90 void SetWatchVariable(bool val);
91 bool CaptureWatchedValue(const ExecutionContext &exe_ctx);
93 void GetDescription(Stream *s, lldb::DescriptionLevel level);
94 void Dump(Stream *s) const override;
95 void DumpSnapshots(Stream *s, const char *prefix = nullptr) const;
96 void DumpWithLevel(Stream *s, lldb::DescriptionLevel description_level) const;
97 Target &GetTarget() { return m_target; }
98 const Status &GetError() { return m_error; }
100 /// Returns the WatchpointOptions structure set for this watchpoint.
103 /// A pointer to this watchpoint's WatchpointOptions.
104 WatchpointOptions *GetOptions() { return &m_options; }
106 /// Set the callback action invoked when the watchpoint is hit.
108 /// \param[in] callback
109 /// The method that will get called when the watchpoint is hit.
110 /// \param[in] callback_baton
111 /// A void * pointer that will get passed back to the callback function.
112 /// \param[in] is_synchronous
113 /// If \b true the callback will be run on the private event thread
114 /// before the stop event gets reported. If false, the callback will get
115 /// handled on the public event thread after the stop has been posted.
118 /// \b true if the process should stop when you hit the watchpoint.
119 /// \b false if it should continue.
120 void SetCallback(WatchpointHitCallback callback, void *callback_baton,
121 bool is_synchronous = false);
123 void SetCallback(WatchpointHitCallback callback,
124 const lldb::BatonSP &callback_baton_sp,
125 bool is_synchronous = false);
127 void ClearCallback();
129 /// Invoke the callback action when the watchpoint is hit.
131 /// \param[in] context
132 /// Described the watchpoint event.
135 /// \b true if the target should stop at this watchpoint and \b false not.
136 bool InvokeCallback(StoppointCallbackContext *context);
139 /// Set the watchpoint's condition.
141 /// \param[in] condition
142 /// The condition expression to evaluate when the watchpoint is hit.
143 /// Pass in nullptr to clear the condition.
144 void SetCondition(const char *condition);
146 /// Return a pointer to the text of the condition expression.
149 /// A pointer to the condition expression text, or nullptr if no
150 // condition has been set.
151 const char *GetConditionText() const;
153 void TurnOnEphemeralMode();
155 void TurnOffEphemeralMode();
157 bool IsDisabledDuringEphemeralMode();
159 const CompilerType &GetCompilerType() { return m_type; }
163 friend class WatchpointList;
165 void ResetHitCount() { m_hit_count = 0; }
167 void ResetHistoricValues() {
168 m_old_value_sp.reset(nullptr);
169 m_new_value_sp.reset(nullptr);
173 bool m_enabled; // Is this watchpoint enabled
174 bool m_is_hardware; // Is this a hardware watchpoint
175 bool m_is_watch_variable; // True if set via 'watchpoint set variable'.
176 bool m_is_ephemeral; // True if the watchpoint is in the ephemeral mode,
177 // meaning that it is
178 // undergoing a pair of temporary disable/enable actions to avoid recursively
179 // triggering further watchpoint events.
180 uint32_t m_disabled_count; // Keep track of the count that the watchpoint is
181 // disabled while in ephemeral mode.
182 // At the end of the ephemeral mode when the watchpoint is to be enabled
183 // again, we check the count, if it is more than 1, it means the user-
184 // supplied actions actually want the watchpoint to be disabled!
185 uint32_t m_watch_read : 1, // 1 if we stop when the watched data is read from
186 m_watch_write : 1, // 1 if we stop when the watched data is written to
187 m_watch_was_read : 1, // Set to 1 when watchpoint is hit for a read access
188 m_watch_was_written : 1; // Set to 1 when watchpoint is hit for a write
190 uint32_t m_ignore_count; // Number of times to ignore this watchpoint
191 uint32_t m_false_alarms; // Number of false alarms.
192 std::string m_decl_str; // Declaration information, if any.
193 std::string m_watch_spec_str; // Spec for the watchpoint.
194 lldb::ValueObjectSP m_old_value_sp;
195 lldb::ValueObjectSP m_new_value_sp;
197 Status m_error; // An error object describing errors associated with this
200 m_options; // Settable watchpoint options, which is a delegate to handle
201 // the callback machinery.
202 bool m_being_created;
204 std::unique_ptr<UserExpression> m_condition_up; // The condition to test.
206 void SetID(lldb::watch_id_t id) { m_loc_id = id; }
208 void SendWatchpointChangedEvent(lldb::WatchpointEventType eventKind);
210 void SendWatchpointChangedEvent(WatchpointEventData *data);
212 DISALLOW_COPY_AND_ASSIGN(Watchpoint);
215 } // namespace lldb_private
217 #endif // liblldb_Watchpoint_h_