xref: /llvm-project-15.0.7/lldb/source/Plugins/Process/Utility/HistoryThread.cpp (revision 16ff8604)

//===-- 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/HistoryUnwind.h"
#include "Plugins/Process/Utility/HistoryThread.h"
#include "Plugins/Process/Utility/RegisterContextHistory.h"

#include "lldb/Core/Log.h"
#include "lldb/Target/StackFrameList.h"
#include "lldb/Target/Process.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.release();
    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;
}