ThreadGDBRemote.cpp revision 263363 
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/Target.h"
23#include "lldb/Target/Unwind.h"
24
25#include "ProcessGDBRemote.h"
26#include "ProcessGDBRemoteLog.h"
27#include "Utility/StringExtractorGDBRemote.h"
28
29using namespace lldb;
30using namespace lldb_private;
31
32//----------------------------------------------------------------------
33// Thread Registers
34//----------------------------------------------------------------------
35
36ThreadGDBRemote::ThreadGDBRemote (Process &process, lldb::tid_t tid) :
37    Thread(process, tid),
38    m_thread_name (),
39    m_dispatch_queue_name (),
40    m_thread_dispatch_qaddr (LLDB_INVALID_ADDRESS)
41{
42    ProcessGDBRemoteLog::LogIf(GDBR_LOG_THREAD, "%p: ThreadGDBRemote::ThreadGDBRemote (pid = %i, tid = 0x%4.4x)",
43                               this,
44                               process.GetID(),
45                               GetID());
46}
47
48ThreadGDBRemote::~ThreadGDBRemote ()
49{
50    ProcessSP process_sp(GetProcess());
51    ProcessGDBRemoteLog::LogIf(GDBR_LOG_THREAD, "%p: ThreadGDBRemote::~ThreadGDBRemote (pid = %i, tid = 0x%4.4x)",
52                               this,
53                               process_sp ? process_sp->GetID() : LLDB_INVALID_PROCESS_ID,
54                               GetID());
55    DestroyThread();
56}
57
58const char *
59ThreadGDBRemote::GetName ()
60{
61    if (m_thread_name.empty())
62        return NULL;
63    return m_thread_name.c_str();
64}
65
66
67const char *
68ThreadGDBRemote::GetQueueName ()
69{
70    // Always re-fetch the dispatch queue name since it can change
71
72    if (m_thread_dispatch_qaddr != 0 || m_thread_dispatch_qaddr != LLDB_INVALID_ADDRESS)
73    {
74        ProcessSP process_sp (GetProcess());
75        if (process_sp)
76        {
77            PlatformSP platform_sp (process_sp->GetTarget().GetPlatform());
78            if (platform_sp)
79            {
80                m_dispatch_queue_name = platform_sp->GetQueueNameForThreadQAddress (process_sp.get(), m_thread_dispatch_qaddr);
81            }
82            if (m_dispatch_queue_name.length() > 0)
83            {
84                return m_dispatch_queue_name.c_str();
85            }
86        }
87    }
88    return NULL;
89}
90
91queue_id_t
92ThreadGDBRemote::GetQueueID ()
93{
94    if (m_thread_dispatch_qaddr != 0 || m_thread_dispatch_qaddr != LLDB_INVALID_ADDRESS)
95    {
96        ProcessSP process_sp (GetProcess());
97        if (process_sp)
98        {
99            PlatformSP platform_sp (process_sp->GetTarget().GetPlatform());
100            if (platform_sp)
101            {
102                return platform_sp->GetQueueIDForThreadQAddress (process_sp.get(), m_thread_dispatch_qaddr);
103            }
104        }
105    }
106    return LLDB_INVALID_QUEUE_ID;
107}
108
109void
110ThreadGDBRemote::WillResume (StateType resume_state)
111{
112    int signo = GetResumeSignal();
113    const lldb::user_id_t tid = GetProtocolID();
114    Log *log(lldb_private::GetLogIfAnyCategoriesSet (GDBR_LOG_THREAD));
115    if (log)
116        log->Printf ("Resuming thread: %4.4" PRIx64 " with state: %s.", tid, StateAsCString(resume_state));
117
118    ProcessSP process_sp (GetProcess());
119    if (process_sp)
120    {
121        ProcessGDBRemote *gdb_process = static_cast<ProcessGDBRemote *>(process_sp.get());
122        switch (resume_state)
123        {
124        case eStateSuspended:
125        case eStateStopped:
126            // Don't append anything for threads that should stay stopped.
127            break;
128
129        case eStateRunning:
130            if (gdb_process->GetUnixSignals().SignalIsValid (signo))
131                gdb_process->m_continue_C_tids.push_back(std::make_pair(tid, signo));
132            else
133                gdb_process->m_continue_c_tids.push_back(tid);
134            break;
135
136        case eStateStepping:
137            if (gdb_process->GetUnixSignals().SignalIsValid (signo))
138                gdb_process->m_continue_S_tids.push_back(std::make_pair(tid, signo));
139            else
140                gdb_process->m_continue_s_tids.push_back(tid);
141            break;
142
143        default:
144            break;
145        }
146    }
147}
148
149void
150ThreadGDBRemote::RefreshStateAfterStop()
151{
152    // Invalidate all registers in our register context. We don't set "force" to
153    // true because the stop reply packet might have had some register values
154    // that were expedited and these will already be copied into the register
155    // context by the time this function gets called. The GDBRemoteRegisterContext
156    // class has been made smart enough to detect when it needs to invalidate
157    // which registers are valid by putting hooks in the register read and
158    // register supply functions where they check the process stop ID and do
159    // the right thing.
160    const bool force = false;
161    GetRegisterContext()->InvalidateIfNeeded (force);
162}
163
164bool
165ThreadGDBRemote::ThreadIDIsValid (lldb::tid_t thread)
166{
167    return thread != 0;
168}
169
170void
171ThreadGDBRemote::Dump(Log *log, uint32_t index)
172{
173}
174
175
176bool
177ThreadGDBRemote::ShouldStop (bool &step_more)
178{
179    return true;
180}
181lldb::RegisterContextSP
182ThreadGDBRemote::GetRegisterContext ()
183{
184    if (m_reg_context_sp.get() == NULL)
185        m_reg_context_sp = CreateRegisterContextForFrame (NULL);
186    return m_reg_context_sp;
187}
188
189lldb::RegisterContextSP
190ThreadGDBRemote::CreateRegisterContextForFrame (StackFrame *frame)
191{
192    lldb::RegisterContextSP reg_ctx_sp;
193    uint32_t concrete_frame_idx = 0;
194
195    if (frame)
196        concrete_frame_idx = frame->GetConcreteFrameIndex ();
197
198
199    if (concrete_frame_idx == 0)
200    {
201        ProcessSP process_sp (GetProcess());
202        if (process_sp)
203        {
204            ProcessGDBRemote *gdb_process = static_cast<ProcessGDBRemote *>(process_sp.get());
205            // read_all_registers_at_once will be true if 'p' packet is not supported.
206            bool read_all_registers_at_once = !gdb_process->GetGDBRemote().GetpPacketSupported (GetID());
207            reg_ctx_sp.reset (new GDBRemoteRegisterContext (*this, concrete_frame_idx, gdb_process->m_register_info, read_all_registers_at_once));
208        }
209    }
210    else
211    {
212        Unwind *unwinder = GetUnwinder ();
213        if (unwinder)
214            reg_ctx_sp = unwinder->CreateRegisterContextForFrame (frame);
215    }
216    return reg_ctx_sp;
217}
218
219bool
220ThreadGDBRemote::PrivateSetRegisterValue (uint32_t reg, StringExtractor &response)
221{
222    GDBRemoteRegisterContext *gdb_reg_ctx = static_cast<GDBRemoteRegisterContext *>(GetRegisterContext ().get());
223    assert (gdb_reg_ctx);
224    return gdb_reg_ctx->PrivateSetRegisterValue (reg, response);
225}
226
227bool
228ThreadGDBRemote::CalculateStopInfo ()
229{
230    ProcessSP process_sp (GetProcess());
231    if (process_sp)
232    {
233        StringExtractorGDBRemote stop_packet;
234        ProcessGDBRemote *gdb_process = static_cast<ProcessGDBRemote *>(process_sp.get());
235        if (gdb_process->GetGDBRemote().GetThreadStopInfo(GetProtocolID(), stop_packet))
236            return gdb_process->SetThreadStopInfo (stop_packet) == eStateStopped;
237    }
238    return false;
239}
240
241
242