xref: /llvm-project-15.0.7/lldb/source/Plugins/Process/Windows/Common/TargetThreadWindows.cpp (revision 18a9135d)

//===-- TargetThreadWindows.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/Core/Log.h"
#include "lldb/Core/Logging.h"
#include "lldb/Core/State.h"
#include "lldb/Host/HostInfo.h"
#include "lldb/Host/HostNativeThreadBase.h"
#include "lldb/Host/windows/HostThreadWindows.h"
#include "lldb/Host/windows/windows.h"
#include "lldb/Target/RegisterContext.h"

#include "TargetThreadWindows.h"
#include "ProcessWindows.h"
#include "ProcessWindowsLog.h"
#include "UnwindLLDB.h"

using namespace lldb;
using namespace lldb_private;

TargetThreadWindows::TargetThreadWindows(ProcessWindows &process, const HostThread &thread)
    : Thread(process, thread.GetNativeThread().GetThreadId())
    , m_host_thread(thread)
{
}

TargetThreadWindows::~TargetThreadWindows()
{
    DestroyThread();
}

void
TargetThreadWindows::RefreshStateAfterStop()
{
    ::SuspendThread(m_host_thread.GetNativeThread().GetSystemHandle());
    SetState(eStateStopped);
    GetRegisterContext()->InvalidateIfNeeded(false);
}

void
TargetThreadWindows::WillResume(lldb::StateType resume_state)
{
}

void
TargetThreadWindows::DidStop()
{
}

bool
TargetThreadWindows::CalculateStopInfo()
{
    SetStopInfo(m_stop_info_sp);
    return true;
}

Unwind *
TargetThreadWindows::GetUnwinder()
{
    // FIXME: Implement an unwinder based on the Windows unwinder exposed through DIA SDK.
    if (m_unwinder_ap.get() == NULL)
        m_unwinder_ap.reset(new UnwindLLDB(*this));
    return m_unwinder_ap.get();
}

bool
TargetThreadWindows::DoResume()
{
    StateType resume_state = GetTemporaryResumeState();
    StateType current_state = GetState();
    if (resume_state == current_state)
        return true;

    if (resume_state == eStateStepping)
    {
        uint32_t flags_index = GetRegisterContext()->ConvertRegisterKindToRegisterNumber(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_FLAGS);
        uint64_t flags_value = GetRegisterContext()->ReadRegisterAsUnsigned(flags_index, 0);
        flags_value |= 0x100; // Set the trap flag on the CPU
        GetRegisterContext()->WriteRegisterFromUnsigned(flags_index, flags_value);
    }

    if (resume_state == eStateStepping || resume_state == eStateRunning)
    {
        DWORD previous_suspend_count = 0;
        HANDLE thread_handle = m_host_thread.GetNativeThread().GetSystemHandle();
        do
        {
            previous_suspend_count = ::ResumeThread(thread_handle);
        } while (previous_suspend_count > 0);
    }
    return true;
}