1 //===-- ThreadGDBRemote.cpp -------------------------------------*- 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
11 #include "ThreadGDBRemote.h"
12
13 #include "lldb/Core/ArchSpec.h"
14 #include "lldb/Core/DataExtractor.h"
15 #include "lldb/Core/StreamString.h"
16 #include "lldb/Core/State.h"
17 #include "lldb/Target/Process.h"
18 #include "lldb/Target/RegisterContext.h"
19 #include "lldb/Target/StopInfo.h"
20 #include "lldb/Target/Target.h"
21 #include "lldb/Target/Unwind.h"
22 #include "lldb/Breakpoint/Watchpoint.h"
23
24 #include "ProcessGDBRemote.h"
25 #include "ProcessGDBRemoteLog.h"
26 #include "Utility/StringExtractorGDBRemote.h"
27
28 using namespace lldb;
29 using namespace lldb_private;
30
31 //----------------------------------------------------------------------
32 // Thread Registers
33 //----------------------------------------------------------------------
34
ThreadGDBRemote(Process & process,lldb::tid_t tid)35 ThreadGDBRemote::ThreadGDBRemote (Process &process, lldb::tid_t tid) :
36 Thread(process, tid),
37 m_thread_name (),
38 m_dispatch_queue_name (),
39 m_thread_dispatch_qaddr (LLDB_INVALID_ADDRESS)
40 {
41 ProcessGDBRemoteLog::LogIf(GDBR_LOG_THREAD, "%p: ThreadGDBRemote::ThreadGDBRemote (pid = %i, tid = 0x%4.4x)",
42 this,
43 process.GetID(),
44 GetID());
45 }
46
~ThreadGDBRemote()47 ThreadGDBRemote::~ThreadGDBRemote ()
48 {
49 ProcessSP process_sp(GetProcess());
50 ProcessGDBRemoteLog::LogIf(GDBR_LOG_THREAD, "%p: ThreadGDBRemote::~ThreadGDBRemote (pid = %i, tid = 0x%4.4x)",
51 this,
52 process_sp ? process_sp->GetID() : LLDB_INVALID_PROCESS_ID,
53 GetID());
54 DestroyThread();
55 }
56
57 const char *
GetName()58 ThreadGDBRemote::GetName ()
59 {
60 if (m_thread_name.empty())
61 return NULL;
62 return m_thread_name.c_str();
63 }
64
65
66 const char *
GetQueueName()67 ThreadGDBRemote::GetQueueName ()
68 {
69 // Always re-fetch the dispatch queue name since it can change
70
71 if (m_thread_dispatch_qaddr != 0 || m_thread_dispatch_qaddr != LLDB_INVALID_ADDRESS)
72 {
73 ProcessSP process_sp (GetProcess());
74 if (process_sp)
75 {
76 ProcessGDBRemote *gdb_process = static_cast<ProcessGDBRemote *>(process_sp.get());
77 return gdb_process->GetDispatchQueueNameForThread (m_thread_dispatch_qaddr, m_dispatch_queue_name);
78 }
79 }
80 return NULL;
81 }
82
83 void
WillResume(StateType resume_state)84 ThreadGDBRemote::WillResume (StateType resume_state)
85 {
86 int signo = GetResumeSignal();
87 const lldb::user_id_t tid = GetProtocolID();
88 Log *log(lldb_private::GetLogIfAnyCategoriesSet (GDBR_LOG_THREAD));
89 if (log)
90 log->Printf ("Resuming thread: %4.4" PRIx64 " with state: %s.", tid, StateAsCString(resume_state));
91
92 ProcessSP process_sp (GetProcess());
93 if (process_sp)
94 {
95 ProcessGDBRemote *gdb_process = static_cast<ProcessGDBRemote *>(process_sp.get());
96 switch (resume_state)
97 {
98 case eStateSuspended:
99 case eStateStopped:
100 // Don't append anything for threads that should stay stopped.
101 break;
102
103 case eStateRunning:
104 if (gdb_process->GetUnixSignals().SignalIsValid (signo))
105 gdb_process->m_continue_C_tids.push_back(std::make_pair(tid, signo));
106 else
107 gdb_process->m_continue_c_tids.push_back(tid);
108 break;
109
110 case eStateStepping:
111 if (gdb_process->GetUnixSignals().SignalIsValid (signo))
112 gdb_process->m_continue_S_tids.push_back(std::make_pair(tid, signo));
113 else
114 gdb_process->m_continue_s_tids.push_back(tid);
115 break;
116
117 default:
118 break;
119 }
120 }
121 }
122
123 void
RefreshStateAfterStop()124 ThreadGDBRemote::RefreshStateAfterStop()
125 {
126 // Invalidate all registers in our register context. We don't set "force" to
127 // true because the stop reply packet might have had some register values
128 // that were expedited and these will already be copied into the register
129 // context by the time this function gets called. The GDBRemoteRegisterContext
130 // class has been made smart enough to detect when it needs to invalidate
131 // which registers are valid by putting hooks in the register read and
132 // register supply functions where they check the process stop ID and do
133 // the right thing.
134 const bool force = false;
135 GetRegisterContext()->InvalidateIfNeeded (force);
136 }
137
138 bool
ThreadIDIsValid(lldb::tid_t thread)139 ThreadGDBRemote::ThreadIDIsValid (lldb::tid_t thread)
140 {
141 return thread != 0;
142 }
143
144 void
Dump(Log * log,uint32_t index)145 ThreadGDBRemote::Dump(Log *log, uint32_t index)
146 {
147 }
148
149
150 bool
ShouldStop(bool & step_more)151 ThreadGDBRemote::ShouldStop (bool &step_more)
152 {
153 return true;
154 }
155 lldb::RegisterContextSP
GetRegisterContext()156 ThreadGDBRemote::GetRegisterContext ()
157 {
158 if (m_reg_context_sp.get() == NULL)
159 m_reg_context_sp = CreateRegisterContextForFrame (NULL);
160 return m_reg_context_sp;
161 }
162
163 lldb::RegisterContextSP
CreateRegisterContextForFrame(StackFrame * frame)164 ThreadGDBRemote::CreateRegisterContextForFrame (StackFrame *frame)
165 {
166 lldb::RegisterContextSP reg_ctx_sp;
167 const bool read_all_registers_at_once = false;
168 uint32_t concrete_frame_idx = 0;
169
170 if (frame)
171 concrete_frame_idx = frame->GetConcreteFrameIndex ();
172
173
174 if (concrete_frame_idx == 0)
175 {
176 ProcessSP process_sp (GetProcess());
177 if (process_sp)
178 {
179 ProcessGDBRemote *gdb_process = static_cast<ProcessGDBRemote *>(process_sp.get());
180 reg_ctx_sp.reset (new GDBRemoteRegisterContext (*this, concrete_frame_idx, gdb_process->m_register_info, read_all_registers_at_once));
181 }
182 }
183 else
184 {
185 Unwind *unwinder = GetUnwinder ();
186 if (unwinder)
187 reg_ctx_sp = unwinder->CreateRegisterContextForFrame (frame);
188 }
189 return reg_ctx_sp;
190 }
191
192 bool
PrivateSetRegisterValue(uint32_t reg,StringExtractor & response)193 ThreadGDBRemote::PrivateSetRegisterValue (uint32_t reg, StringExtractor &response)
194 {
195 GDBRemoteRegisterContext *gdb_reg_ctx = static_cast<GDBRemoteRegisterContext *>(GetRegisterContext ().get());
196 assert (gdb_reg_ctx);
197 return gdb_reg_ctx->PrivateSetRegisterValue (reg, response);
198 }
199
200 bool
CalculateStopInfo()201 ThreadGDBRemote::CalculateStopInfo ()
202 {
203 ProcessSP process_sp (GetProcess());
204 if (process_sp)
205 {
206 StringExtractorGDBRemote stop_packet;
207 ProcessGDBRemote *gdb_process = static_cast<ProcessGDBRemote *>(process_sp.get());
208 if (gdb_process->GetGDBRemote().GetThreadStopInfo(GetProtocolID(), stop_packet))
209 return gdb_process->SetThreadStopInfo (stop_packet) == eStateStopped;
210 }
211 return false;
212 }
213
214
215