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1 //===-- ThreadPlanCallFunction.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_ThreadPlanCallFunction_h_
11 #define liblldb_ThreadPlanCallFunction_h_
12
13 // C Includes
14 // C++ Includes
15 // Other libraries and framework includes
16 // Project includes
17 #include "lldb/lldb-private.h"
18 #include "lldb/Target/Thread.h"
19 #include "lldb/Target/ThreadPlan.h"
20
21 namespace lldb_private {
22
23 class ThreadPlanCallFunction : public ThreadPlan
24 {
25     // Create a thread plan to call a function at the address passed in the "function"
26     // argument.  If you plan to call GetReturnValueObject, then pass in the 
27     // return type, otherwise just pass in an invalid ClangASTType.
28 public:
29     ThreadPlanCallFunction (Thread &thread,
30                             const Address &function,
31                             const ClangASTType &return_type,
32                             lldb::addr_t arg,
33                             bool stop_other_threads,
34                             bool unwind_on_error = true,
35                             bool ignore_breakpoints = false,
36                             lldb::addr_t *this_arg = 0,
37                             lldb::addr_t *cmd_arg = 0);
38
39     ThreadPlanCallFunction (Thread &thread,
40                             const Address &function,
41                             const ClangASTType &return_type,
42                             bool stop_other_threads,
43                             bool unwind_on_error,
44                             bool ignore_breakpoints,
45                             lldb::addr_t *arg1_ptr = NULL,
46                             lldb::addr_t *arg2_ptr = NULL,
47                             lldb::addr_t *arg3_ptr = NULL,
48                             lldb::addr_t *arg4_ptr = NULL,
49                             lldb::addr_t *arg5_ptr = NULL,
50                             lldb::addr_t *arg6_ptr = NULL);
51
52     virtual
53     ~ThreadPlanCallFunction ();
54
55     virtual void
56     GetDescription (Stream *s, lldb::DescriptionLevel level);
57
58     virtual bool
59     ValidatePlan (Stream *error);
60
61     virtual bool
62     ShouldStop (Event *event_ptr);
63     
64     virtual Vote
65     ShouldReportStop(Event *event_ptr);
66
67     virtual bool
68     StopOthers ();
69     
70     virtual void
71     SetStopOthers (bool new_value);
72
73     virtual lldb::StateType
74     GetPlanRunState ();
75
76     virtual void
77     DidPush ();
78
79     virtual bool
80     WillStop ();
81
82     virtual bool
83     MischiefManaged ();
84
85     // To get the return value from a function call you must create a 
86     // lldb::ValueSP that contains a valid clang type in its context and call
87     // RequestReturnValue. The ValueSP will be stored and when the function is
88     // done executing, the object will check if there is a requested return 
89     // value. If there is, the return value will be retrieved using the 
90     // ABI::GetReturnValue() for the ABI in the process. Then after the thread
91     // plan is complete, you can call "GetReturnValue()" to retrieve the value
92     // that was extracted.
93
94     virtual lldb::ValueObjectSP
95     GetReturnValueObject ()
96     {
97         return m_return_valobj_sp;
98     }
99
100     // Return the stack pointer that the function received
101     // on entry.  Any stack address below this should be 
102     // considered invalid after the function has been
103     // cleaned up.
104     lldb::addr_t
105     GetFunctionStackPointer()
106     {
107         return m_function_sp;
108     }
109     
110     // Classes that derive from ClangFunction, and implement
111     // their own WillPop methods should call this so that the
112     // thread state gets restored if the plan gets discarded.
113     virtual void
114     WillPop ();
115     
116     // If the thread plan stops mid-course, this will be the stop reason that interrupted us.
117     // Once DoTakedown is called, this will be the real stop reason at the end of the function call.
118     // If it hasn't been set for one or the other of these reasons, we'll return the PrivateStopReason.
119     // This is needed because we want the CallFunction thread plans not to show up as the stop reason.
120     // But if something bad goes wrong, it is nice to be able to tell the user what really happened.
121
122     virtual lldb::StopInfoSP
123     GetRealStopInfo()
124     {
125         if (m_real_stop_info_sp)
126             return m_real_stop_info_sp;
127         else
128             return GetPrivateStopInfo ();
129     }
130     
131     lldb::addr_t
132     GetStopAddress ()
133     {
134         return m_stop_address;
135     }
136
137     virtual bool
138     RestoreThreadState();
139
140 protected:    
141     void ReportRegisterState (const char *message);
142
143     virtual bool
144     DoPlanExplainsStop (Event *event_ptr);
145
146 private:
147
148     bool
149     ConstructorSetup (Thread &thread,
150                       ABI *& abi,
151                       lldb::addr_t &start_load_addr,
152                       lldb::addr_t &function_load_addr);
153
154     void
155     DoTakedown (bool success);
156     
157     void
158     SetBreakpoints ();
159     
160     void
161     ClearBreakpoints ();
162     
163     bool
164     BreakpointsExplainStop ();
165     
166     bool                                            m_valid;
167     bool                                            m_stop_other_threads;
168     Address                                         m_function_addr;
169     Address                                         m_start_addr;
170     lldb::addr_t                                    m_function_sp;
171     Thread::RegisterCheckpoint                      m_register_backup;
172     lldb::ThreadPlanSP                              m_subplan_sp;
173     LanguageRuntime                                *m_cxx_language_runtime;
174     LanguageRuntime                                *m_objc_language_runtime;
175     Thread::ThreadStateCheckpoint                   m_stored_thread_state;
176     lldb::StopInfoSP                                m_real_stop_info_sp; // In general we want to hide call function
177                                                                          // thread plans, but for reporting purposes,
178                                                                          // it's nice to know the real stop reason.
179                                                                          // This gets set in DoTakedown.
180     StreamString                                    m_constructor_errors;
181     ClangASTType                                    m_return_type;
182     lldb::ValueObjectSP                             m_return_valobj_sp;  // If this contains a valid pointer, use the ABI to extract values when complete
183     bool                                            m_takedown_done;    // We want to ensure we only do the takedown once.  This ensures that.
184     lldb::addr_t                                    m_stop_address;     // This is the address we stopped at.  Also set in DoTakedown;
185     bool                                            m_unwind_on_error;
186     bool                                            m_ignore_breakpoints;
187
188     DISALLOW_COPY_AND_ASSIGN (ThreadPlanCallFunction);
189 };
190
191 } // namespace lldb_private
192
193 #endif  // liblldb_ThreadPlanCallFunction_h_