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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/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/WatchpointLocation.h"
#include "LibUnwindRegisterContext.h"
#include "ProcessGDBRemote.h"
#include "ProcessGDBRemoteLog.h"
#include "Utility/StringExtractorGDBRemote.h"
#include "UnwindLibUnwind.h"
#include "UnwindMacOSXFrameBackchain.h"
#include "UnwindLLDB.h"
using namespace lldb;
using namespace lldb_private;
//----------------------------------------------------------------------
// Thread Registers
//----------------------------------------------------------------------
ThreadGDBRemote::ThreadGDBRemote (ProcessGDBRemote &process, lldb::tid_t tid) :
Thread(process, tid),
m_thread_name (),
m_dispatch_queue_name (),
m_thread_dispatch_qaddr (LLDB_INVALID_ADDRESS)
{
// ProcessGDBRemoteLog::LogIf(GDBR_LOG_THREAD | GDBR_LOG_VERBOSE, "ThreadGDBRemote::ThreadGDBRemote ( pid = %i, tid = 0x%4.4x, )", m_process.GetID(), GetID());
ProcessGDBRemoteLog::LogIf(GDBR_LOG_THREAD, "%p: ThreadGDBRemote::ThreadGDBRemote (pid = %i, tid = 0x%4.4x)", this, m_process.GetID(), GetID());
}
ThreadGDBRemote::~ThreadGDBRemote ()
{
ProcessGDBRemoteLog::LogIf(GDBR_LOG_THREAD, "%p: ThreadGDBRemote::~ThreadGDBRemote (pid = %i, tid = 0x%4.4x)", this, m_process.GetID(), GetID());
DestroyThread();
}
const char *
ThreadGDBRemote::GetInfo ()
{
return NULL;
}
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)
return GetGDBProcess().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();
switch (resume_state)
{
case eStateSuspended:
case eStateStopped:
// Don't append anything for threads that should stay stopped.
break;
case eStateRunning:
if (m_process.GetUnixSignals().SignalIsValid (signo))
GetGDBProcess().m_continue_packet.Printf(";C%2.2x:%4.4x", signo, GetID());
else
GetGDBProcess().m_continue_packet.Printf(";c:%4.4x", GetID());
break;
case eStateStepping:
if (m_process.GetUnixSignals().SignalIsValid (signo))
GetGDBProcess().m_continue_packet.Printf(";S%2.2x:%4.4x", signo, GetID());
else
GetGDBProcess().m_continue_packet.Printf(";s:%4.4x", GetID());
break;
default:
break;
}
return true;
}
void
ThreadGDBRemote::RefreshStateAfterStop()
{
// Invalidate all registers in our register context
GetRegisterContext()->Invalidate();
}
// Whether to use the new native unwinder (UnwindLLDB) or the libunwind-remote based unwinder for
// stack walks on i386/x86_64
#define USE_NATIVE_UNWINDER
Unwind *
ThreadGDBRemote::GetUnwinder ()
{
if (m_unwinder_ap.get() == NULL)
{
const ArchSpec target_arch (GetProcess().GetTarget().GetArchitecture ());
if (target_arch == ArchSpec("x86_64") || target_arch == ArchSpec("i386"))
{
#if defined (USE_NATIVE_UNWINDER)
m_unwinder_ap.reset (new UnwindLLDB (*this));
#else
m_unwinder_ap.reset (new UnwindLibUnwind (*this, GetGDBProcess().GetLibUnwindAddressSpace()));
#endif
}
else
{
m_unwinder_ap.reset (new UnwindMacOSXFrameBackchain (*this));
}
}
return m_unwinder_ap.get();
}
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;
}
RegisterContext *
ThreadGDBRemote::GetRegisterContext ()
{
if (m_reg_context_sp.get() == NULL)
m_reg_context_sp.reset (CreateRegisterContextForFrame (NULL));
return m_reg_context_sp.get();
}
RegisterContext *
ThreadGDBRemote::CreateRegisterContextForFrame (StackFrame *frame)
{
const bool read_all_registers_at_once = false;
uint32_t frame_idx = 0;
if (frame)
frame_idx = frame->GetFrameIndex ();
if (frame_idx == 0)
return new GDBRemoteRegisterContext (*this, frame, GetGDBProcess().m_register_info, read_all_registers_at_once);
else if (m_unwinder_ap.get())
return m_unwinder_ap->CreateRegisterContextForFrame (frame);
return NULL;
}
bool
ThreadGDBRemote::SaveFrameZeroState (RegisterCheckpoint &checkpoint)
{
lldb::StackFrameSP frame_sp(GetStackFrameAtIndex (0));
if (frame_sp)
{
checkpoint.SetStackID(frame_sp->GetStackID());
return frame_sp->GetRegisterContext()->ReadAllRegisterValues (checkpoint.GetData());
}
return false;
}
bool
ThreadGDBRemote::RestoreSaveFrameZero (const RegisterCheckpoint &checkpoint)
{
lldb::StackFrameSP frame_sp(GetStackFrameAtIndex (0));
if (frame_sp)
{
bool ret = frame_sp->GetRegisterContext()->WriteAllRegisterValues (checkpoint.GetData());
frame_sp->GetRegisterContext()->Invalidate();
ClearStackFrames();
return ret;
}
return false;
}
lldb::StopInfoSP
ThreadGDBRemote::GetPrivateStopReason ()
{
if (m_actual_stop_info_sp.get() == NULL || m_actual_stop_info_sp->IsValid() == false)
{
m_actual_stop_info_sp.reset();
char packet[256];
::snprintf(packet, sizeof(packet), "qThreadStopInfo%x", GetID());
StringExtractorGDBRemote stop_packet;
if (GetGDBProcess().GetGDBRemote().SendPacketAndWaitForResponse(packet, stop_packet, 1, false))
{
std::string copy(stop_packet.GetStringRef());
GetGDBProcess().SetThreadStopInfo (stop_packet);
}
}
return m_actual_stop_info_sp;
}
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