text: //===-- HistoryThread.cpp ---------------------------------------*- C++ -*-===//
  //
  //                     The LLVM Compiler Infrastructure
  //
  // This file is distributed under the University of Illinois Open Source
  // License. See LICENSE.TXT for details.
  //
  //===----------------------------------------------------------------------===//
  
  #include "lldb/lldb-private.h"
  
  #include "Plugins/Process/Utility/HistoryThread.h"
  #include "Plugins/Process/Utility/HistoryUnwind.h"
  #include "Plugins/Process/Utility/RegisterContextHistory.h"
  
  #include "lldb/Core/Log.h"
  #include "lldb/Target/Process.h"
  #include "lldb/Target/StackFrameList.h"
  
  using namespace lldb;
  using namespace lldb_private;
  
  //  Constructor
  
  HistoryThread::HistoryThread(lldb_private::Process &process, lldb::tid_t tid,
                               std::vector<lldb::addr_t> pcs, uint32_t stop_id,
                               bool stop_id_is_valid)
      : Thread(process, tid, true), m_framelist_mutex(), m_framelist(),
        m_pcs(pcs), m_stop_id(stop_id), m_stop_id_is_valid(stop_id_is_valid),
        m_extended_unwind_token(LLDB_INVALID_ADDRESS), m_queue_name(),
        m_thread_name(), m_originating_unique_thread_id(tid),
        m_queue_id(LLDB_INVALID_QUEUE_ID) {
    m_unwinder_ap.reset(new HistoryUnwind(*this, pcs, stop_id_is_valid));
    Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_OBJECT));
    if (log)
      log->Printf("%p HistoryThread::HistoryThread", static_cast<void *>(this));
  }
  
  //  Destructor
  
  HistoryThread::~HistoryThread() {
    Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_OBJECT));
    if (log)
      log->Printf("%p HistoryThread::~HistoryThread (tid=0x%" PRIx64 ")",
                  static_cast<void *>(this), GetID());
    DestroyThread();
  }
  
  lldb::RegisterContextSP HistoryThread::GetRegisterContext() {
    RegisterContextSP rctx;
    if (m_pcs.size() > 0) {
      rctx.reset(new RegisterContextHistory(
          *this, 0, GetProcess()->GetAddressByteSize(), m_pcs[0]));
    }
    return rctx;
  }
  
  lldb::RegisterContextSP
  HistoryThread::CreateRegisterContextForFrame(StackFrame *frame) {
    return m_unwinder_ap->CreateRegisterContextForFrame(frame);
  }
  
  lldb::StackFrameListSP HistoryThread::GetStackFrameList() {
    // FIXME do not throw away the lock after we acquire it..
    std::unique_lock<std::mutex> lock(m_framelist_mutex);
    lock.unlock();
    if (m_framelist.get() == NULL) {
      m_framelist.reset(new StackFrameList(*this, StackFrameListSP(), true));
    }
  
    return m_framelist;
  }
  
  uint32_t HistoryThread::GetExtendedBacktraceOriginatingIndexID() {
    if (m_originating_unique_thread_id != LLDB_INVALID_THREAD_ID) {
      if (GetProcess()->HasAssignedIndexIDToThread(
              m_originating_unique_thread_id)) {
        return GetProcess()->AssignIndexIDToThread(
            m_originating_unique_thread_id);
      }
    }
    return LLDB_INVALID_THREAD_ID;
  }
  