ThreadGDBRemote.cpp revision 254721 
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
28using namespace lldb;
29using namespace lldb_private;
30
31//----------------------------------------------------------------------
32// Thread Registers
33//----------------------------------------------------------------------
34
35ThreadGDBRemote::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
47ThreadGDBRemote::~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
57const char *
58ThreadGDBRemote::GetName ()
59{
60    if (m_thread_name.empty())
61        return NULL;
62    return m_thread_name.c_str();
63}
64
65
66const char *
67ThreadGDBRemote::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
83void
84ThreadGDBRemote::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
123void
124ThreadGDBRemote::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
138bool
139ThreadGDBRemote::ThreadIDIsValid (lldb::tid_t thread)
140{
141    return thread != 0;
142}
143
144void
145ThreadGDBRemote::Dump(Log *log, uint32_t index)
146{
147}
148
149
150bool
151ThreadGDBRemote::ShouldStop (bool &step_more)
152{
153    return true;
154}
155lldb::RegisterContextSP
156ThreadGDBRemote::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
163lldb::RegisterContextSP
164ThreadGDBRemote::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
192bool
193ThreadGDBRemote::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
200bool
201ThreadGDBRemote::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