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//===-- ThreadKDP.cpp -------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "ThreadKDP.h"
#include "llvm/Support/MachO.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/WatchpointLocation.h"
#include "ProcessKDP.h"
#include "ProcessKDPLog.h"
#include "RegisterContextKDP_arm.h"
#include "RegisterContextKDP_i386.h"
#include "RegisterContextKDP_x86_64.h"
#include "Plugins/Process/Utility/UnwindLLDB.h"
#if defined(__APPLE__)
#include "UnwindMacOSXFrameBackchain.h"
#endif
using namespace lldb;
using namespace lldb_private;
//----------------------------------------------------------------------
// Thread Registers
//----------------------------------------------------------------------
ThreadKDP::ThreadKDP (ProcessKDP &process, lldb::tid_t tid) :
Thread(process, tid),
m_thread_name (),
m_dispatch_queue_name (),
m_thread_dispatch_qaddr (LLDB_INVALID_ADDRESS)
{
ProcessKDPLog::LogIf(KDP_LOG_THREAD, "%p: ThreadKDP::ThreadKDP (pid = %i, tid = 0x%4.4x)", this, m_process.GetID(), GetID());
}
ThreadKDP::~ThreadKDP ()
{
ProcessKDPLog::LogIf(KDP_LOG_THREAD, "%p: ThreadKDP::~ThreadKDP (pid = %i, tid = 0x%4.4x)", this, m_process.GetID(), GetID());
DestroyThread();
}
const char *
ThreadKDP::GetInfo ()
{
return NULL;
}
const char *
ThreadKDP::GetName ()
{
if (m_thread_name.empty())
return NULL;
return m_thread_name.c_str();
}
const char *
ThreadKDP::GetQueueName ()
{
return NULL;
}
bool
ThreadKDP::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);
lldb::LogSP log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_STEP));
if (log)
log->Printf ("Resuming thread: %4.4x with state: %s.", GetID(), StateAsCString(resume_state));
// ProcessKDP &process = GetKDPProcess();
// switch (resume_state)
// {
// case eStateSuspended:
// case eStateStopped:
// // Don't append anything for threads that should stay stopped.
// break;
//
// case eStateRunning:
// case eStateStepping:
// break;
//
// default:
// break;
// }
return true;
}
void
ThreadKDP::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 KDPRegisterContext
// 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);
}
Unwind *
ThreadKDP::GetUnwinder ()
{
if (m_unwinder_ap.get() == NULL)
{
const ArchSpec target_arch (GetProcess().GetTarget().GetArchitecture ());
const llvm::Triple::ArchType machine = target_arch.GetMachine();
switch (machine)
{
case llvm::Triple::x86_64:
case llvm::Triple::x86:
case llvm::Triple::arm:
case llvm::Triple::thumb:
m_unwinder_ap.reset (new UnwindLLDB (*this));
break;
default:
#if defined(__APPLE__)
m_unwinder_ap.reset (new UnwindMacOSXFrameBackchain (*this));
#endif
break;
}
}
return m_unwinder_ap.get();
}
void
ThreadKDP::ClearStackFrames ()
{
Unwind *unwinder = GetUnwinder ();
if (unwinder)
unwinder->Clear();
Thread::ClearStackFrames();
}
bool
ThreadKDP::ThreadIDIsValid (lldb::tid_t thread)
{
return thread != 0;
}
void
ThreadKDP::Dump(Log *log, uint32_t index)
{
}
bool
ThreadKDP::ShouldStop (bool &step_more)
{
return true;
}
lldb::RegisterContextSP
ThreadKDP::GetRegisterContext ()
{
if (m_reg_context_sp.get() == NULL)
m_reg_context_sp = CreateRegisterContextForFrame (NULL);
return m_reg_context_sp;
}
lldb::RegisterContextSP
ThreadKDP::CreateRegisterContextForFrame (StackFrame *frame)
{
lldb::RegisterContextSP reg_ctx_sp;
uint32_t concrete_frame_idx = 0;
if (frame)
concrete_frame_idx = frame->GetConcreteFrameIndex ();
if (concrete_frame_idx == 0)
{
switch (GetKDPProcess().GetCommunication().GetCPUType())
{
case llvm::MachO::CPUTypeARM:
reg_ctx_sp.reset (new RegisterContextKDP_arm (*this, concrete_frame_idx));
break;
case llvm::MachO::CPUTypeI386:
reg_ctx_sp.reset (new RegisterContextKDP_i386 (*this, concrete_frame_idx));
break;
case llvm::MachO::CPUTypeX86_64:
reg_ctx_sp.reset (new RegisterContextKDP_x86_64 (*this, concrete_frame_idx));
break;
default:
assert (!"Add CPU type support in KDP");
break;
}
}
else if (m_unwinder_ap.get())
reg_ctx_sp = m_unwinder_ap->CreateRegisterContextForFrame (frame);
return reg_ctx_sp;
}
lldb::StopInfoSP
ThreadKDP::GetPrivateStopReason ()
{
const uint32_t process_stop_id = GetProcess().GetStopID();
if (m_thread_stop_reason_stop_id != process_stop_id ||
(m_actual_stop_info_sp && !m_actual_stop_info_sp->IsValid()))
{
// TODO: can we query the initial state of the thread here?
// For now I am just going to pretend that a SIGSTOP happened.
SetStopInfo(StopInfo::CreateStopReasonWithSignal (*this, SIGSTOP));
// If GetKDPProcess().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 KDP 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();
}
return m_actual_stop_info_sp;
}
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