ThreadGDBRemote.cpp revision 276479 
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/Breakpoint/Watchpoint.h"
14#include "lldb/Core/ArchSpec.h"
15#include "lldb/Core/DataExtractor.h"
16#include "lldb/Core/State.h"
17#include "lldb/Core/StreamString.h"
18#include "lldb/Target/Platform.h"
19#include "lldb/Target/Process.h"
20#include "lldb/Target/RegisterContext.h"
21#include "lldb/Target/StopInfo.h"
22#include "lldb/Target/SystemRuntime.h"
23#include "lldb/Target/Target.h"
24#include "lldb/Target/Unwind.h"
25
26#include "ProcessGDBRemote.h"
27#include "ProcessGDBRemoteLog.h"
28#include "Utility/StringExtractorGDBRemote.h"
29
30using namespace lldb;
31using namespace lldb_private;
32
33//----------------------------------------------------------------------
34// Thread Registers
35//----------------------------------------------------------------------
36
37ThreadGDBRemote::ThreadGDBRemote (Process &process, lldb::tid_t tid) :
38    Thread(process, tid),
39    m_thread_name (),
40    m_dispatch_queue_name (),
41    m_thread_dispatch_qaddr (LLDB_INVALID_ADDRESS)
42{
43    ProcessGDBRemoteLog::LogIf(GDBR_LOG_THREAD, "%p: ThreadGDBRemote::ThreadGDBRemote (pid = %i, tid = 0x%4.4x)",
44                               this,
45                               process.GetID(),
46                               GetID());
47}
48
49ThreadGDBRemote::~ThreadGDBRemote ()
50{
51    ProcessSP process_sp(GetProcess());
52    ProcessGDBRemoteLog::LogIf(GDBR_LOG_THREAD, "%p: ThreadGDBRemote::~ThreadGDBRemote (pid = %i, tid = 0x%4.4x)",
53                               this,
54                               process_sp ? process_sp->GetID() : LLDB_INVALID_PROCESS_ID,
55                               GetID());
56    DestroyThread();
57}
58
59const char *
60ThreadGDBRemote::GetName ()
61{
62    if (m_thread_name.empty())
63        return NULL;
64    return m_thread_name.c_str();
65}
66
67
68const char *
69ThreadGDBRemote::GetQueueName ()
70{
71    // Always re-fetch the dispatch queue name since it can change
72
73    if (m_thread_dispatch_qaddr != 0 || m_thread_dispatch_qaddr != LLDB_INVALID_ADDRESS)
74    {
75        ProcessSP process_sp (GetProcess());
76        if (process_sp)
77        {
78            SystemRuntime *runtime = process_sp->GetSystemRuntime ();
79            if (runtime)
80            {
81                m_dispatch_queue_name = runtime->GetQueueNameFromThreadQAddress (m_thread_dispatch_qaddr);
82            }
83            if (m_dispatch_queue_name.length() > 0)
84            {
85                return m_dispatch_queue_name.c_str();
86            }
87        }
88    }
89    return NULL;
90}
91
92queue_id_t
93ThreadGDBRemote::GetQueueID ()
94{
95    if (m_thread_dispatch_qaddr != 0 || m_thread_dispatch_qaddr != LLDB_INVALID_ADDRESS)
96    {
97        ProcessSP process_sp (GetProcess());
98        if (process_sp)
99        {
100            SystemRuntime *runtime = process_sp->GetSystemRuntime ();
101            if (runtime)
102            {
103                return runtime->GetQueueIDFromThreadQAddress (m_thread_dispatch_qaddr);
104            }
105        }
106    }
107    return LLDB_INVALID_QUEUE_ID;
108}
109
110QueueSP
111ThreadGDBRemote::GetQueue ()
112{
113    queue_id_t queue_id = GetQueueID();
114    QueueSP queue;
115    if (queue_id != LLDB_INVALID_QUEUE_ID)
116    {
117        ProcessSP process_sp (GetProcess());
118        if (process_sp)
119        {
120            queue = process_sp->GetQueueList().FindQueueByID (queue_id);
121        }
122    }
123    return queue;
124}
125
126addr_t
127ThreadGDBRemote::GetQueueLibdispatchQueueAddress ()
128{
129    addr_t dispatch_queue_t_addr = LLDB_INVALID_ADDRESS;
130    if (m_thread_dispatch_qaddr != 0 || m_thread_dispatch_qaddr != LLDB_INVALID_ADDRESS)
131    {
132        ProcessSP process_sp (GetProcess());
133        if (process_sp)
134        {
135            SystemRuntime *runtime = process_sp->GetSystemRuntime ();
136            if (runtime)
137            {
138                dispatch_queue_t_addr = runtime->GetLibdispatchQueueAddressFromThreadQAddress (m_thread_dispatch_qaddr);
139            }
140        }
141    }
142    return dispatch_queue_t_addr;
143}
144
145StructuredData::ObjectSP
146ThreadGDBRemote::FetchThreadExtendedInfo ()
147{
148    StructuredData::ObjectSP object_sp;
149    const lldb::user_id_t tid = GetProtocolID();
150    Log *log(lldb_private::GetLogIfAnyCategoriesSet (GDBR_LOG_THREAD));
151    if (log)
152        log->Printf ("Fetching extended information for thread %4.4" PRIx64, tid);
153    ProcessSP process_sp (GetProcess());
154    if (process_sp)
155    {
156        ProcessGDBRemote *gdb_process = static_cast<ProcessGDBRemote *>(process_sp.get());
157        object_sp = gdb_process->GetExtendedInfoForThread (tid);
158    }
159    return object_sp;
160}
161
162void
163ThreadGDBRemote::WillResume (StateType resume_state)
164{
165    int signo = GetResumeSignal();
166    const lldb::user_id_t tid = GetProtocolID();
167    Log *log(lldb_private::GetLogIfAnyCategoriesSet (GDBR_LOG_THREAD));
168    if (log)
169        log->Printf ("Resuming thread: %4.4" PRIx64 " with state: %s.", tid, StateAsCString(resume_state));
170
171    ProcessSP process_sp (GetProcess());
172    if (process_sp)
173    {
174        ProcessGDBRemote *gdb_process = static_cast<ProcessGDBRemote *>(process_sp.get());
175        switch (resume_state)
176        {
177        case eStateSuspended:
178        case eStateStopped:
179            // Don't append anything for threads that should stay stopped.
180            break;
181
182        case eStateRunning:
183            if (gdb_process->GetUnixSignals().SignalIsValid (signo))
184                gdb_process->m_continue_C_tids.push_back(std::make_pair(tid, signo));
185            else
186                gdb_process->m_continue_c_tids.push_back(tid);
187            break;
188
189        case eStateStepping:
190            if (gdb_process->GetUnixSignals().SignalIsValid (signo))
191                gdb_process->m_continue_S_tids.push_back(std::make_pair(tid, signo));
192            else
193                gdb_process->m_continue_s_tids.push_back(tid);
194            break;
195
196        default:
197            break;
198        }
199    }
200}
201
202void
203ThreadGDBRemote::RefreshStateAfterStop()
204{
205    // Invalidate all registers in our register context. We don't set "force" to
206    // true because the stop reply packet might have had some register values
207    // that were expedited and these will already be copied into the register
208    // context by the time this function gets called. The GDBRemoteRegisterContext
209    // class has been made smart enough to detect when it needs to invalidate
210    // which registers are valid by putting hooks in the register read and
211    // register supply functions where they check the process stop ID and do
212    // the right thing.
213    const bool force = false;
214    GetRegisterContext()->InvalidateIfNeeded (force);
215}
216
217bool
218ThreadGDBRemote::ThreadIDIsValid (lldb::tid_t thread)
219{
220    return thread != 0;
221}
222
223void
224ThreadGDBRemote::Dump(Log *log, uint32_t index)
225{
226}
227
228
229bool
230ThreadGDBRemote::ShouldStop (bool &step_more)
231{
232    return true;
233}
234lldb::RegisterContextSP
235ThreadGDBRemote::GetRegisterContext ()
236{
237    if (m_reg_context_sp.get() == NULL)
238        m_reg_context_sp = CreateRegisterContextForFrame (NULL);
239    return m_reg_context_sp;
240}
241
242lldb::RegisterContextSP
243ThreadGDBRemote::CreateRegisterContextForFrame (StackFrame *frame)
244{
245    lldb::RegisterContextSP reg_ctx_sp;
246    uint32_t concrete_frame_idx = 0;
247
248    if (frame)
249        concrete_frame_idx = frame->GetConcreteFrameIndex ();
250
251
252    if (concrete_frame_idx == 0)
253    {
254        ProcessSP process_sp (GetProcess());
255        if (process_sp)
256        {
257            ProcessGDBRemote *gdb_process = static_cast<ProcessGDBRemote *>(process_sp.get());
258            // read_all_registers_at_once will be true if 'p' packet is not supported.
259            bool read_all_registers_at_once = !gdb_process->GetGDBRemote().GetpPacketSupported (GetID());
260            reg_ctx_sp.reset (new GDBRemoteRegisterContext (*this, concrete_frame_idx, gdb_process->m_register_info, read_all_registers_at_once));
261        }
262    }
263    else
264    {
265        Unwind *unwinder = GetUnwinder ();
266        if (unwinder)
267            reg_ctx_sp = unwinder->CreateRegisterContextForFrame (frame);
268    }
269    return reg_ctx_sp;
270}
271
272bool
273ThreadGDBRemote::PrivateSetRegisterValue (uint32_t reg, StringExtractor &response)
274{
275    GDBRemoteRegisterContext *gdb_reg_ctx = static_cast<GDBRemoteRegisterContext *>(GetRegisterContext ().get());
276    assert (gdb_reg_ctx);
277    return gdb_reg_ctx->PrivateSetRegisterValue (reg, response);
278}
279
280bool
281ThreadGDBRemote::CalculateStopInfo ()
282{
283    ProcessSP process_sp (GetProcess());
284    if (process_sp)
285    {
286        StringExtractorGDBRemote stop_packet;
287        ProcessGDBRemote *gdb_process = static_cast<ProcessGDBRemote *>(process_sp.get());
288        if (gdb_process->GetGDBRemote().GetThreadStopInfo(GetProtocolID(), stop_packet))
289            return gdb_process->SetThreadStopInfo (stop_packet) == eStateStopped;
290    }
291    return false;
292}
293
294
295