lldb/source/Plugins/Process/Windows/TargetThreadWindows.cpp

//===-- 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/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 "UnwindLLDB.h"

#if defined(_WIN64)
#include "x64/RegisterContextWindows_x64.h"
#else
#include "x86/RegisterContextWindows_x86.h"
#endif

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());

    GetRegisterContext()->InvalidateIfNeeded(false);
}

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

void
TargetThreadWindows::DidStop()
{
}

RegisterContextSP
TargetThreadWindows::GetRegisterContext()
{
    if (!m_reg_context_sp)
        m_reg_context_sp = CreateRegisterContextForFrameIndex(0);

    return m_reg_context_sp;
}

RegisterContextSP
TargetThreadWindows::CreateRegisterContextForFrame(StackFrame *frame)
{
    return CreateRegisterContextForFrameIndex(frame->GetConcreteFrameIndex());
}

RegisterContextSP
TargetThreadWindows::CreateRegisterContextForFrameIndex(uint32_t idx)
{
    if (!m_reg_context_sp)
    {
        ArchSpec arch = HostInfo::GetArchitecture();
        switch (arch.GetMachine())
        {
            case llvm::Triple::x86:
#if defined(_WIN64)
                // FIXME: This is a Wow64 process, create a RegisterContextWindows_Wow64
#else
                m_reg_context_sp.reset(new RegisterContextWindows_x86(*this, idx));
#endif
                break;
            case llvm::Triple::x86_64:
#if defined(_WIN64)
                m_reg_context_sp.reset(new RegisterContextWindows_x64(*this, idx));
#else
                // LLDB is 32-bit, but the target process is 64-bit.  We probably can't debug this.
#endif
            default:
                break;
        }
    }
    return m_reg_context_sp;
}

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 = GetResumeState();
    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;
}