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//===-- ThreadGDBRemote.cpp -------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "ThreadGDBRemote.h"
#include "lldb/Core/ArchSpec.h"
#include "lldb/Core/DataExtractor.h"
#include "lldb/Core/StreamString.h"
#include "lldb/Core/State.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/RegisterContext.h"
#include "lldb/Target/StopInfo.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/Unwind.h"
#include "lldb/Breakpoint/Watchpoint.h"
#include "ProcessGDBRemote.h"
#include "ProcessGDBRemoteLog.h"
#include "Utility/StringExtractorGDBRemote.h"
using namespace lldb;
using namespace lldb_private;
//----------------------------------------------------------------------
// Thread Registers
//----------------------------------------------------------------------
ThreadGDBRemote::ThreadGDBRemote (const ProcessSP &process_sp, lldb::tid_t tid) :
Thread(process_sp, tid),
m_thread_name (),
m_dispatch_queue_name (),
m_thread_dispatch_qaddr (LLDB_INVALID_ADDRESS)
{
ProcessGDBRemoteLog::LogIf(GDBR_LOG_THREAD, "%p: ThreadGDBRemote::ThreadGDBRemote (pid = %i, tid = 0x%4.4x)",
this,
process_sp ? process_sp->GetID() : LLDB_INVALID_PROCESS_ID,
GetID());
}
ThreadGDBRemote::~ThreadGDBRemote ()
{
ProcessSP process_sp(GetProcess());
ProcessGDBRemoteLog::LogIf(GDBR_LOG_THREAD, "%p: ThreadGDBRemote::~ThreadGDBRemote (pid = %i, tid = 0x%4.4x)",
this,
process_sp ? process_sp->GetID() : LLDB_INVALID_PROCESS_ID,
GetID());
DestroyThread();
}
const char *
ThreadGDBRemote::GetName ()
{
if (m_thread_name.empty())
return NULL;
return m_thread_name.c_str();
}
const char *
ThreadGDBRemote::GetQueueName ()
{
// Always re-fetch the dispatch queue name since it can change
if (m_thread_dispatch_qaddr != 0 || m_thread_dispatch_qaddr != LLDB_INVALID_ADDRESS)
{
ProcessSP process_sp (GetProcess());
if (process_sp)
{
ProcessGDBRemote *gdb_process = static_cast<ProcessGDBRemote *>(process_sp.get());
return gdb_process->GetDispatchQueueNameForThread (m_thread_dispatch_qaddr, m_dispatch_queue_name);
}
}
return NULL;
}
bool
ThreadGDBRemote::WillResume (StateType resume_state)
{
ClearStackFrames();
// Call the Thread::WillResume first. If we stop at a signal, the stop info
// class for signal will set the resume signal that we need below. The signal
// stuff obeys the Process::UnixSignal defaults.
Thread::WillResume(resume_state);
int signo = GetResumeSignal();
lldb::LogSP log(lldb_private::GetLogIfAnyCategoriesSet (GDBR_LOG_THREAD));
if (log)
log->Printf ("Resuming thread: %4.4llx with state: %s.", GetID(), StateAsCString(resume_state));
ProcessSP process_sp (GetProcess());
if (process_sp)
{
ProcessGDBRemote *gdb_process = static_cast<ProcessGDBRemote *>(process_sp.get());
switch (resume_state)
{
case eStateSuspended:
case eStateStopped:
// Don't append anything for threads that should stay stopped.
break;
case eStateRunning:
if (gdb_process->GetUnixSignals().SignalIsValid (signo))
gdb_process->m_continue_C_tids.push_back(std::make_pair(GetID(), signo));
else
gdb_process->m_continue_c_tids.push_back(GetID());
break;
case eStateStepping:
if (gdb_process->GetUnixSignals().SignalIsValid (signo))
gdb_process->m_continue_S_tids.push_back(std::make_pair(GetID(), signo));
else
gdb_process->m_continue_s_tids.push_back(GetID());
break;
default:
break;
}
return true;
}
return false;
}
void
ThreadGDBRemote::RefreshStateAfterStop()
{
// Invalidate all registers in our register context. We don't set "force" to
// true because the stop reply packet might have had some register values
// that were expedited and these will already be copied into the register
// context by the time this function gets called. The GDBRemoteRegisterContext
// class has been made smart enough to detect when it needs to invalidate
// which registers are valid by putting hooks in the register read and
// register supply functions where they check the process stop ID and do
// the right thing.
const bool force = false;
GetRegisterContext()->InvalidateIfNeeded (force);
}
void
ThreadGDBRemote::ClearStackFrames ()
{
Unwind *unwinder = GetUnwinder ();
if (unwinder)
unwinder->Clear();
Thread::ClearStackFrames();
}
bool
ThreadGDBRemote::ThreadIDIsValid (lldb::tid_t thread)
{
return thread != 0;
}
void
ThreadGDBRemote::Dump(Log *log, uint32_t index)
{
}
bool
ThreadGDBRemote::ShouldStop (bool &step_more)
{
return true;
}
lldb::RegisterContextSP
ThreadGDBRemote::GetRegisterContext ()
{
if (m_reg_context_sp.get() == NULL)
m_reg_context_sp = CreateRegisterContextForFrame (NULL);
return m_reg_context_sp;
}
lldb::RegisterContextSP
ThreadGDBRemote::CreateRegisterContextForFrame (StackFrame *frame)
{
lldb::RegisterContextSP reg_ctx_sp;
const bool read_all_registers_at_once = false;
uint32_t concrete_frame_idx = 0;
if (frame)
concrete_frame_idx = frame->GetConcreteFrameIndex ();
if (concrete_frame_idx == 0)
{
ProcessSP process_sp (GetProcess());
if (process_sp)
{
ProcessGDBRemote *gdb_process = static_cast<ProcessGDBRemote *>(process_sp.get());
reg_ctx_sp.reset (new GDBRemoteRegisterContext (*this, concrete_frame_idx, gdb_process->m_register_info, read_all_registers_at_once));
}
}
else if (m_unwinder_ap.get())
reg_ctx_sp = m_unwinder_ap->CreateRegisterContextForFrame (frame);
return reg_ctx_sp;
}
bool
ThreadGDBRemote::PrivateSetRegisterValue (uint32_t reg, StringExtractor &response)
{
GDBRemoteRegisterContext *gdb_reg_ctx = static_cast<GDBRemoteRegisterContext *>(GetRegisterContext ().get());
assert (gdb_reg_ctx);
return gdb_reg_ctx->PrivateSetRegisterValue (reg, response);
}
lldb::StopInfoSP
ThreadGDBRemote::GetPrivateStopReason ()
{
ProcessSP process_sp (GetProcess());
if (process_sp)
{
const uint32_t process_stop_id = process_sp->GetStopID();
if (m_thread_stop_reason_stop_id != process_stop_id ||
(m_actual_stop_info_sp && !m_actual_stop_info_sp->IsValid()))
{
// If GetGDBProcess().SetThreadStopInfo() doesn't find a stop reason
// for this thread, then m_actual_stop_info_sp will not ever contain
// a valid stop reason and the "m_actual_stop_info_sp->IsValid() == false"
// check will never be able to tell us if we have the correct stop info
// for this thread and we will continually send qThreadStopInfo packets
// down to the remote GDB server, so we need to keep our own notion
// of the stop ID that m_actual_stop_info_sp is valid for (even if it
// contains nothing). We use m_thread_stop_reason_stop_id for this below.
m_thread_stop_reason_stop_id = process_stop_id;
m_actual_stop_info_sp.reset();
StringExtractorGDBRemote stop_packet;
ProcessGDBRemote *gdb_process = static_cast<ProcessGDBRemote *>(process_sp.get());
if (gdb_process->GetGDBRemote().GetThreadStopInfo(GetID(), stop_packet))
gdb_process->SetThreadStopInfo (stop_packet);
}
}
return m_actual_stop_info_sp;
}
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