Main/src-client/MachineDebuggerImpl.cpp

	MachineDebuggerImpl.cpp revision 6ca8a1595bddf29de7894958ae74c255eb2693be
/* $Id$ */
/** @file
 * VBox IMachineDebugger COM class implementation.
 */

/*
 * Copyright (C) 2006-2010 Oracle Corporation
 *
 * This file is part of VirtualBox Open Source Edition (OSE), as
 * available from http://www.virtualbox.org. This file is free software;
 * you can redistribute it and/or modify it under the terms of the GNU
 * General Public License (GPL) as published by the Free Software
 * Foundation, in version 2 as it comes in the "COPYING" file of the
 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
 */

#include "MachineDebuggerImpl.h"

#include "Global.h"
#include "ConsoleImpl.h"

#include "AutoCaller.h"
#include "Logging.h"

#include <VBox/vmm/em.h>
#include <VBox/vmm/patm.h>
#include <VBox/vmm/csam.h>
#include <VBox/vmm/vm.h>
#include <VBox/vmm/tm.h>
#include <VBox/vmm/hwaccm.h>
#include <VBox/err.h>
#include <iprt/cpp/utils.h>

// defines
/////////////////////////////////////////////////////////////////////////////


// globals
/////////////////////////////////////////////////////////////////////////////


// constructor / destructor
/////////////////////////////////////////////////////////////////////////////

MachineDebugger::MachineDebugger()
    : mParent(NULL)
{
}

MachineDebugger::~MachineDebugger()
{
}

HRESULT MachineDebugger::FinalConstruct()
{
    unconst(mParent) = NULL;
    return S_OK;
}

void MachineDebugger::FinalRelease()
{
    uninit();
}

// public initializer/uninitializer for internal purposes only
/////////////////////////////////////////////////////////////////////////////

/**
 * Initializes the machine debugger object.
 *
 * @returns COM result indicator
 * @param aParent handle of our parent object
 */
HRESULT MachineDebugger::init (Console *aParent)
{
    LogFlowThisFunc(("aParent=%p\n", aParent));

    ComAssertRet(aParent, E_INVALIDARG);

    /* Enclose the state transition NotReady->InInit->Ready */
    AutoInitSpan autoInitSpan(this);
    AssertReturn(autoInitSpan.isOk(), E_FAIL);

    unconst(mParent) = aParent;

    mSinglestepQueued = ~0;
    mRecompileUserQueued = ~0;
    mRecompileSupervisorQueued = ~0;
    mPatmEnabledQueued = ~0;
    mCsamEnabledQueued = ~0;
    mLogEnabledQueued = ~0;
    mVirtualTimeRateQueued = ~0;
    mFlushMode = false;

    /* Confirm a successful initialization */
    autoInitSpan.setSucceeded();

    return S_OK;
}

/**
 *  Uninitializes the instance and sets the ready flag to FALSE.
 *  Called either from FinalRelease() or by the parent when it gets destroyed.
 */
void MachineDebugger::uninit()
{
    LogFlowThisFunc(("\n"));

    /* Enclose the state transition Ready->InUninit->NotReady */
    AutoUninitSpan autoUninitSpan(this);
    if (autoUninitSpan.uninitDone())
        return;

    unconst(mParent) = NULL;
    mFlushMode = false;
}

// IMachineDebugger properties
/////////////////////////////////////////////////////////////////////////////

/**
 * Returns the current singlestepping flag.
 *
 * @returns COM status code
 * @param   aEnabled address of result variable
 */
STDMETHODIMP MachineDebugger::COMGETTER(Singlestep) (BOOL *aEnabled)
{
    CheckComArgOutPointerValid(aEnabled);

    AutoCaller autoCaller(this);
    if (FAILED(autoCaller.rc())) return autoCaller.rc();

    /** @todo */
    ReturnComNotImplemented();
}

/**
 * Sets the singlestepping flag.
 *
 * @returns COM status code
 * @param aEnable new singlestepping flag
 */
STDMETHODIMP MachineDebugger::COMSETTER(Singlestep) (BOOL aEnable)
{
    AutoCaller autoCaller(this);
    if (FAILED(autoCaller.rc())) return autoCaller.rc();

    /** @todo */
    ReturnComNotImplemented();
}

/**
 * Returns the current recompile user mode code flag.
 *
 * @returns COM status code
 * @param   aEnabled address of result variable
 */
STDMETHODIMP MachineDebugger::COMGETTER(RecompileUser) (BOOL *aEnabled)
{
    CheckComArgOutPointerValid(aEnabled);

    AutoCaller autoCaller(this);
    if (FAILED(autoCaller.rc())) return autoCaller.rc();

    AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);

    Console::SafeVMPtrQuiet pVM (mParent);

    if (pVM.isOk())
        *aEnabled = !EMIsRawRing3Enabled (pVM.raw());
    else
        *aEnabled = false;

    return S_OK;
}

/**
 * Sets the recompile user mode code flag.
 *
 * @returns COM status
 * @param   aEnable new user mode code recompile flag.
 */
STDMETHODIMP MachineDebugger::COMSETTER(RecompileUser) (BOOL aEnable)
{
    LogFlowThisFunc(("enable=%d\n", aEnable));

    AutoCaller autoCaller(this);
    if (FAILED(autoCaller.rc())) return autoCaller.rc();

    AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);

    if (queueSettings())
    {
        // queue the request
        mRecompileUserQueued = aEnable;
        return S_OK;
    }

    Console::SafeVMPtr pVM (mParent);
    if (FAILED(pVM.rc())) return pVM.rc();

    EMRAWMODE rawModeFlag = aEnable ? EMRAW_RING3_DISABLE : EMRAW_RING3_ENABLE;
    int rcVBox = VMR3ReqCallWait(pVM, VMCPUID_ANY, (PFNRT)EMR3RawSetMode, 2, pVM.raw(), rawModeFlag);
    if (RT_SUCCESS(rcVBox))
        return S_OK;

    AssertMsgFailed (("Could not set raw mode flags to %d, rcVBox = %Rrc\n",
                      rawModeFlag, rcVBox));
    return E_FAIL;
}

/**
 * Returns the current recompile supervisor code flag.
 *
 * @returns COM status code
 * @param   aEnabled address of result variable
 */
STDMETHODIMP MachineDebugger::COMGETTER(RecompileSupervisor) (BOOL *aEnabled)
{
    CheckComArgOutPointerValid(aEnabled);

    AutoCaller autoCaller(this);
    if (FAILED(autoCaller.rc())) return autoCaller.rc();

    AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);

    Console::SafeVMPtrQuiet pVM (mParent);

    if (pVM.isOk())
        *aEnabled = !EMIsRawRing0Enabled (pVM.raw());
    else
        *aEnabled = false;

    return S_OK;
}

/**
 * Sets the new recompile supervisor code flag.
 *
 * @returns COM status code
 * @param   aEnable new recompile supervisor code flag
 */
STDMETHODIMP MachineDebugger::COMSETTER(RecompileSupervisor) (BOOL aEnable)
{
    LogFlowThisFunc(("enable=%d\n", aEnable));

    AutoCaller autoCaller(this);
    if (FAILED(autoCaller.rc())) return autoCaller.rc();

    AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);

    if (queueSettings())
    {
        // queue the request
        mRecompileSupervisorQueued = aEnable;
        return S_OK;
    }

    Console::SafeVMPtr pVM (mParent);
    if (FAILED(pVM.rc())) return pVM.rc();

    EMRAWMODE rawModeFlag = aEnable ? EMRAW_RING0_DISABLE : EMRAW_RING0_ENABLE;
    int rcVBox = VMR3ReqCallWait(pVM, VMCPUID_ANY, (PFNRT)EMR3RawSetMode, 2, pVM.raw(), rawModeFlag);
    if (RT_SUCCESS(rcVBox))
        return S_OK;

    AssertMsgFailed (("Could not set raw mode flags to %d, rcVBox = %Rrc\n",
                      rawModeFlag, rcVBox));
    return E_FAIL;
}

/**
 * Returns the current patch manager enabled flag.
 *
 * @returns COM status code
 * @param   aEnabled address of result variable
 */
STDMETHODIMP MachineDebugger::COMGETTER(PATMEnabled) (BOOL *aEnabled)
{
    CheckComArgOutPointerValid(aEnabled);

    AutoCaller autoCaller(this);
    if (FAILED(autoCaller.rc())) return autoCaller.rc();

    AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);

    Console::SafeVMPtrQuiet pVM (mParent);

    if (pVM.isOk())
        *aEnabled = PATMIsEnabled (pVM.raw());
    else
        *aEnabled = false;

    return S_OK;
}

/**
 * Set the new patch manager enabled flag.
 *
 * @returns COM status code
 * @param   aEnable new patch manager enabled flag
 */
STDMETHODIMP MachineDebugger::COMSETTER(PATMEnabled) (BOOL aEnable)
{
    LogFlowThisFunc(("enable=%d\n", aEnable));

    AutoCaller autoCaller(this);
    if (FAILED(autoCaller.rc())) return autoCaller.rc();

    AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);

    if (queueSettings())
    {
        // queue the request
        mPatmEnabledQueued = aEnable;
        return S_OK;
    }

    Console::SafeVMPtr pVM(mParent);
    if (FAILED(pVM.rc())) return pVM.rc();

    PATMR3AllowPatching (pVM, aEnable);

    return S_OK;
}

/**
 * Returns the current code scanner enabled flag.
 *
 * @returns COM status code
 * @param   aEnabled address of result variable
 */
STDMETHODIMP MachineDebugger::COMGETTER(CSAMEnabled) (BOOL *aEnabled)
{
    CheckComArgOutPointerValid(aEnabled);

    AutoCaller autoCaller(this);
    if (FAILED(autoCaller.rc())) return autoCaller.rc();

    AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);

    Console::SafeVMPtrQuiet pVM (mParent);

    if (pVM.isOk())
        *aEnabled = CSAMIsEnabled (pVM.raw());
    else
        *aEnabled = false;

    return S_OK;
}

/**
 * Sets the new code scanner enabled flag.
 *
 * @returns COM status code
 * @param   aEnable new code scanner enabled flag
 */
STDMETHODIMP MachineDebugger::COMSETTER(CSAMEnabled) (BOOL aEnable)
{
    LogFlowThisFunc(("enable=%d\n", aEnable));

    AutoCaller autoCaller(this);
    if (FAILED(autoCaller.rc())) return autoCaller.rc();

    AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);

    if (queueSettings())
    {
        // queue the request
        mCsamEnabledQueued = aEnable;
        return S_OK;
    }

    Console::SafeVMPtr pVM(mParent);
    if (FAILED(pVM.rc())) return pVM.rc();

    int vrc;
    if (aEnable)
        vrc = CSAMEnableScanning (pVM);
    else
        vrc = CSAMDisableScanning (pVM);

    if (RT_FAILURE(vrc))
    {
        /** @todo handle error case */
    }

    return S_OK;
}

/**
 * Returns the log enabled / disabled status.
 *
 * @returns COM status code
 * @param   aEnabled     address of result variable
 */
STDMETHODIMP MachineDebugger::COMGETTER(LogEnabled) (BOOL *aEnabled)
{
    CheckComArgOutPointerValid(aEnabled);

    AutoCaller autoCaller(this);
    if (FAILED(autoCaller.rc())) return autoCaller.rc();

#ifdef LOG_ENABLED
    AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);

    const PRTLOGGER pLogInstance = RTLogDefaultInstance();
    *aEnabled = pLogInstance && !(pLogInstance->fFlags & RTLOGFLAGS_DISABLED);
#else
    *aEnabled = false;
#endif

    return S_OK;
}

/**
 * Enables or disables logging.
 *
 * @returns COM status code
 * @param   aEnabled    The new code log state.
 */
STDMETHODIMP MachineDebugger::COMSETTER(LogEnabled) (BOOL aEnabled)
{
    LogFlowThisFunc(("aEnabled=%d\n", aEnabled));

    AutoCaller autoCaller(this);
    if (FAILED(autoCaller.rc())) return autoCaller.rc();

    AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);

    if (queueSettings())
    {
        // queue the request
        mLogEnabledQueued = aEnabled;
        return S_OK;
    }

    Console::SafeVMPtr pVM(mParent);
    if (FAILED(pVM.rc())) return pVM.rc();

#ifdef LOG_ENABLED
    int vrc = DBGFR3LogModifyFlags (pVM, aEnabled ? "enabled" : "disabled");
    if (RT_FAILURE(vrc))
    {
        /** @todo handle error code. */
    }
#endif

    return S_OK;
}

STDMETHODIMP MachineDebugger::COMGETTER(LogFlags)(BSTR *a_pbstrSettings)
{
    ReturnComNotImplemented();
}

STDMETHODIMP MachineDebugger::COMGETTER(LogGroups)(BSTR *a_pbstrSettings)
{
    ReturnComNotImplemented();
}

STDMETHODIMP MachineDebugger::COMGETTER(LogDestinations)(BSTR *a_pbstrSettings)
{
    ReturnComNotImplemented();
}

/**
 * Returns the current hardware virtualization flag.
 *
 * @returns COM status code
 * @param   aEnabled address of result variable
 */
STDMETHODIMP MachineDebugger::COMGETTER(HWVirtExEnabled) (BOOL *aEnabled)
{
    CheckComArgOutPointerValid(aEnabled);

    AutoCaller autoCaller(this);
    if (FAILED(autoCaller.rc())) return autoCaller.rc();

    AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);

    Console::SafeVMPtrQuiet pVM (mParent);

    if (pVM.isOk())
        *aEnabled = HWACCMIsEnabled (pVM.raw());
    else
        *aEnabled = false;

    return S_OK;
}

/**
 * Returns the current nested paging flag.
 *
 * @returns COM status code
 * @param   aEnabled address of result variable
 */
STDMETHODIMP MachineDebugger::COMGETTER(HWVirtExNestedPagingEnabled) (BOOL *aEnabled)
{
    CheckComArgOutPointerValid(aEnabled);

    AutoCaller autoCaller(this);
    if (FAILED(autoCaller.rc())) return autoCaller.rc();

    AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);

    Console::SafeVMPtrQuiet pVM (mParent);

    if (pVM.isOk())
        *aEnabled = HWACCMR3IsNestedPagingActive (pVM.raw());
    else
        *aEnabled = false;

    return S_OK;
}

/**
 * Returns the current VPID flag.
 *
 * @returns COM status code
 * @param   aEnabled address of result variable
 */
STDMETHODIMP MachineDebugger::COMGETTER(HWVirtExVPIDEnabled) (BOOL *aEnabled)
{
    CheckComArgOutPointerValid(aEnabled);

    AutoCaller autoCaller(this);
    if (FAILED(autoCaller.rc())) return autoCaller.rc();

    AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);

    Console::SafeVMPtrQuiet pVM (mParent);

    if (pVM.isOk())
        *aEnabled = HWACCMR3IsVPIDActive (pVM.raw());
    else
        *aEnabled = false;

    return S_OK;
}

STDMETHODIMP MachineDebugger::COMGETTER(OSName)(BSTR *a_pbstrName)
{
    LogFlowThisFunc(("\n"));
    CheckComArgNotNull(a_pbstrName);
    AutoCaller autoCaller(this);
    HRESULT hrc = autoCaller.rc();
    if (SUCCEEDED(hrc))
    {
        AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
        Console::SafeVMPtr ptrVM(mParent);
        hrc = ptrVM.rc();
        if (SUCCEEDED(hrc))
        {
            /*
             * Do the job and try convert the name.
             */
            char szName[64];
            int vrc = DBGFR3OSQueryNameAndVersion(ptrVM.raw(), szName, sizeof(szName), NULL, 0);
            if (RT_SUCCESS(vrc))
            {
                try
                {
                    Bstr bstrName(szName);
                    bstrName.detachTo(a_pbstrName);
                }
                catch (std::bad_alloc)
                {
                    hrc = E_OUTOFMEMORY;
                }
            }
            else
                hrc = setError(VBOX_E_VM_ERROR, tr("DBGFR3OSQueryNameAndVersion failed with %Rrc"), vrc);
        }
    }
    return hrc;
}

STDMETHODIMP MachineDebugger::COMGETTER(OSVersion)(BSTR *a_pbstrVersion)
{
    LogFlowThisFunc(("\n"));
    CheckComArgNotNull(a_pbstrVersion);
    AutoCaller autoCaller(this);
    HRESULT hrc = autoCaller.rc();
    if (SUCCEEDED(hrc))
    {
        AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
        Console::SafeVMPtr ptrVM(mParent);
        hrc = ptrVM.rc();
        if (SUCCEEDED(hrc))
        {
            /*
             * Do the job and try convert the name.
             */
            char szVersion[256];
            int vrc = DBGFR3OSQueryNameAndVersion(ptrVM.raw(), NULL, 0, szVersion, sizeof(szVersion));
            if (RT_SUCCESS(vrc))
            {
                try
                {
                    Bstr bstrVersion(szVersion);
                    bstrVersion.detachTo(a_pbstrVersion);
                }
                catch (std::bad_alloc)
                {
                    hrc = E_OUTOFMEMORY;
                }
            }
            else
                hrc = setError(VBOX_E_VM_ERROR, tr("DBGFR3OSQueryNameAndVersion failed with %Rrc"), vrc);
        }
    }
    return hrc;
}

/**
 * Returns the current PAE flag.
 *
 * @returns COM status code
 * @param   aEnabled address of result variable
 */
STDMETHODIMP MachineDebugger::COMGETTER(PAEEnabled) (BOOL *aEnabled)
{
    CheckComArgOutPointerValid(aEnabled);

    AutoCaller autoCaller(this);
    if (FAILED(autoCaller.rc())) return autoCaller.rc();

    AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);

    Console::SafeVMPtrQuiet pVM (mParent);

    if (pVM.isOk())
    {
        uint64_t cr4 = CPUMGetGuestCR4 (VMMGetCpu0(pVM.raw()));
        *aEnabled = !!(cr4 & X86_CR4_PAE);
    }
    else
        *aEnabled = false;

    return S_OK;
}

/**
 * Returns the current virtual time rate.
 *
 * @returns COM status code.
 * @param   aPct     Where to store the rate.
 */
STDMETHODIMP MachineDebugger::COMGETTER(VirtualTimeRate) (ULONG *aPct)
{
    CheckComArgOutPointerValid(aPct);

    AutoCaller autoCaller(this);
    if (FAILED(autoCaller.rc())) return autoCaller.rc();

    AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);

    Console::SafeVMPtrQuiet pVM (mParent);

    if (pVM.isOk())
        *aPct = TMGetWarpDrive (pVM);
    else
        *aPct = 100;

    return S_OK;
}

/**
 * Returns the current virtual time rate.
 *
 * @returns COM status code.
 * @param   aPct     Where to store the rate.
 */
STDMETHODIMP MachineDebugger::COMSETTER(VirtualTimeRate) (ULONG aPct)
{
    if (aPct < 2 || aPct > 20000)
        return E_INVALIDARG;

    AutoCaller autoCaller(this);
    if (FAILED(autoCaller.rc())) return autoCaller.rc();

    AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);

    if (queueSettings())
    {
        // queue the request
        mVirtualTimeRateQueued = aPct;
        return S_OK;
    }

    Console::SafeVMPtr pVM(mParent);
    if (FAILED(pVM.rc())) return pVM.rc();

    int vrc = TMR3SetWarpDrive (pVM, aPct);
    if (RT_FAILURE(vrc))
    {
        /** @todo handle error code. */
    }

    return S_OK;
}

/**
 * Hack for getting the VM handle.
 * This is only temporary (promise) while prototyping the debugger.
 *
 * @returns COM status code
 * @param   aVm      Where to store the vm handle.
 *                  Since there is no uintptr_t in COM, we're using the max integer.
 *                  (No, ULONG is not pointer sized!)
 */
STDMETHODIMP MachineDebugger::COMGETTER(VM) (LONG64 *aVm)
{
    CheckComArgOutPointerValid(aVm);

    AutoCaller autoCaller(this);
    if (FAILED(autoCaller.rc())) return autoCaller.rc();

    AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);

    Console::SafeVMPtr pVM(mParent);
    if (FAILED(pVM.rc())) return pVM.rc();

    *aVm = (intptr_t)pVM.raw();

    /*
     *  Note: pVM protection provided by SafeVMPtr is no more effective
     *  after we return from this method.
     */

    return S_OK;
}

// IMachineDebugger methods
/////////////////////////////////////////////////////////////////////////////

STDMETHODIMP MachineDebugger::DumpGuestCore(IN_BSTR a_bstrFilename, IN_BSTR a_bstrCompression)
{
    CheckComArgStrNotEmptyOrNull(a_bstrFilename);
    Utf8Str strFilename(a_bstrFilename);
    if (a_bstrCompression && *a_bstrCompression)
        return setError(E_INVALIDARG, tr("The compression parameter must be empty"));

    AutoCaller autoCaller(this);
    HRESULT hrc = autoCaller.rc();
    if (SUCCEEDED(hrc))
    {
        AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
        Console::SafeVMPtr ptrVM(mParent);
        hrc = ptrVM.rc();
        if (SUCCEEDED(hrc))
        {
            int vrc = DBGFR3CoreWrite(ptrVM, strFilename.c_str(), false /*fReplaceFile*/);
            if (RT_SUCCESS(vrc))
                hrc = S_OK;
            else
                hrc = setError(E_FAIL, tr("DBGFR3CoreWrite failed with %Rrc"), vrc);
        }
    }

    return hrc;
}

STDMETHODIMP MachineDebugger::DumpHostProcessCore(IN_BSTR a_bstrFilename, IN_BSTR a_bstrCompression)
{
    ReturnComNotImplemented();
}

/**
 * Debug info string buffer formatter.
 */
typedef struct MACHINEDEBUGGERINOFHLP
{
    /** The core info helper structure. */
    DBGFINFOHLP Core;
    /** Pointer to the buffer. */
    char       *pszBuf;
    /** The size of the buffer. */
    size_t      cbBuf;
    /** The offset into the buffer */
    size_t      offBuf;
    /** Indicates an out-of-memory condition. */
    bool        fOutOfMemory;
} MACHINEDEBUGGERINOFHLP;
/** Pointer to a Debug info string buffer formatter. */
typedef MACHINEDEBUGGERINOFHLP *PMACHINEDEBUGGERINOFHLP;


/**
 * @callback_method_impl{FNRTSTROUTPUT}
 */
static DECLCALLBACK(size_t) MachineDebuggerInfoOutput(void *pvArg, const char *pachChars, size_t cbChars)
{
    PMACHINEDEBUGGERINOFHLP pHlp = (PMACHINEDEBUGGERINOFHLP)pvArg;

    /*
     * Grow the buffer if required.
     */
    size_t const cbRequired  = cbChars + pHlp->offBuf + 1;
    if (cbRequired > pHlp->cbBuf)
    {
        if (RT_UNLIKELY(pHlp->fOutOfMemory))
            return 0;

        size_t cbBufNew = pHlp->cbBuf * 2;
        if (cbRequired > cbBufNew)
            cbBufNew = RT_ALIGN_Z(cbRequired, 256);
        void *pvBufNew = RTMemRealloc(pHlp->pszBuf, cbBufNew);
        if (RT_UNLIKELY(!pvBufNew))
        {
            pHlp->fOutOfMemory = true;
            RTMemFree(pHlp->pszBuf);
            pHlp->pszBuf = NULL;
            pHlp->cbBuf  = 0;
            pHlp->offBuf = 0;
            return 0;
        }

        pHlp->pszBuf = (char *)pvBufNew;
        pHlp->cbBuf  = cbBufNew;
    }

    /*
     * Copy the bytes into the buffer and terminate it.
     */
    memcpy(&pHlp->pszBuf[pHlp->offBuf], pachChars, cbChars);
    pHlp->offBuf += cbChars;
    pHlp->pszBuf[pHlp->offBuf] = '\0';
    Assert(pHlp->offBuf < pHlp->cbBuf);
    return cbChars;
}

/**
 * @interface_method_impl{DBGFINFOHLP, pfnPrintfV}
 */
static DECLCALLBACK(void) MachineDebuggerInfoPrintfV(PCDBGFINFOHLP pHlp, const char *pszFormat, va_list va)
{
    RTStrFormatV(MachineDebuggerInfoOutput, (void *)pHlp, NULL,  NULL, pszFormat, va);
}

/**
 * @interface_method_impl{DBGFINFOHLP, pfnPrintf}
 */
static DECLCALLBACK(void) MachineDebuggerInfoPrintf(PCDBGFINFOHLP pHlp, const char *pszFormat, ...)
{
    va_list va;
    va_start(va, pszFormat);
    MachineDebuggerInfoPrintfV(pHlp, pszFormat, va);
    va_end(va);
}

/**
 * Initializes the debug info string buffer formatter
 *
 * @param   pHlp                The help structure to init.
 */
static void MachineDebuggerInfoInit(PMACHINEDEBUGGERINOFHLP pHlp)
{
    pHlp->Core.pfnPrintf    = MachineDebuggerInfoPrintf;
    pHlp->Core.pfnPrintfV   = MachineDebuggerInfoPrintfV;
    pHlp->pszBuf            = NULL;
    pHlp->cbBuf             = 0;
    pHlp->offBuf            = 0;
    pHlp->fOutOfMemory      = false;
}

/**
 * Deletes the debug info string buffer formatter.
 * @param   pHlp                The helper structure to delete.
 */
static void MachineDebuggerInfoDelete(PMACHINEDEBUGGERINOFHLP pHlp)
{
    RTMemFree(pHlp->pszBuf);
    pHlp->pszBuf = NULL;
}

STDMETHODIMP MachineDebugger::Info(IN_BSTR a_bstrName, IN_BSTR a_bstrArgs, BSTR *a_pbstrInfo)
{
    LogFlowThisFunc(("\n"));

    /*
     * Validate and convert input.
     */
    CheckComArgStrNotEmptyOrNull(a_bstrName);
    Utf8Str strName, strArgs;
    try
    {
        strName = a_bstrName;
        strArgs = a_bstrArgs;
    }
    catch (std::bad_alloc)
    {
        return E_OUTOFMEMORY;
    }

    /*
     * Do the autocaller and lock bits.
     */
    AutoCaller autoCaller(this);
    HRESULT hrc = autoCaller.rc();
    if (SUCCEEDED(hrc))
    {
        AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
        Console::SafeVMPtr ptrVM(mParent);
        hrc = ptrVM.rc();
        if (SUCCEEDED(hrc))
        {
            /*
             * Create a helper and call DBGFR3Info.
             */
            MACHINEDEBUGGERINOFHLP Hlp;
            MachineDebuggerInfoInit(&Hlp);
            int vrc = DBGFR3Info(ptrVM.raw(),  strName.c_str(),  strArgs.c_str(), &Hlp.Core);
            if (RT_SUCCESS(vrc))
            {
                if (!Hlp.fOutOfMemory)
                {
                    /*
                     * Convert the info string, watching out for allocation errors.
                     */
                    try
                    {
                        Bstr bstrInfo(Hlp.pszBuf);
                        bstrInfo.detachTo(a_pbstrInfo);
                    }
                    catch (std::bad_alloc)
                    {
                        hrc = E_OUTOFMEMORY;
                    }
                }
                else
                    hrc = E_OUTOFMEMORY;
            }
            else
                hrc = setError(VBOX_E_VM_ERROR, tr("DBGFR3Info failed with %Rrc"), vrc);
            MachineDebuggerInfoDelete(&Hlp);
        }
    }
    return hrc;
}

STDMETHODIMP MachineDebugger::InjectNMI()
{
    LogFlowThisFunc(("\n"));

    AutoCaller autoCaller(this);
    HRESULT hrc = autoCaller.rc();
    if (SUCCEEDED(hrc))
    {
        AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
        Console::SafeVMPtr ptrVM(mParent);
        hrc = ptrVM.rc();
        if (SUCCEEDED(hrc))
        {
            int vrc = HWACCMR3InjectNMI(ptrVM);
            if (RT_SUCCESS(vrc))
                hrc = S_OK;
            else
                hrc = setError(E_FAIL, tr("HWACCMR3InjectNMI failed with %Rrc"), vrc);
        }
    }
    return hrc;
}

STDMETHODIMP MachineDebugger::ModifyLogFlags(IN_BSTR a_bstrSettings)
{
    ReturnComNotImplemented();
}

STDMETHODIMP MachineDebugger::ModifyLogGroups(IN_BSTR a_bstrSettings)
{
    ReturnComNotImplemented();
}

STDMETHODIMP MachineDebugger::ModifyLogDestinations(IN_BSTR a_bstrSettings)
{
    ReturnComNotImplemented();
}

STDMETHODIMP MachineDebugger::ReadPhysicalMemory(LONG64 a_Address, ULONG a_cbRead, ComSafeArrayOut(BYTE, a_abData))
{
    ReturnComNotImplemented();
}

STDMETHODIMP MachineDebugger::WritePhysicalMemory(LONG64 a_Address, ULONG a_cbRead, ComSafeArrayIn(BYTE, a_abData))
{
    ReturnComNotImplemented();
}

STDMETHODIMP MachineDebugger::ReadVirtualMemory(ULONG a_idCpu, LONG64 a_Address, ULONG a_cbRead, ComSafeArrayOut(BYTE, a_abData))
{
    ReturnComNotImplemented();
}

STDMETHODIMP MachineDebugger::WriteVirtualMemory(ULONG a_idCpu, LONG64 a_Address, ULONG a_cbRead, ComSafeArrayIn(BYTE, a_abData))
{
    ReturnComNotImplemented();
}

STDMETHODIMP MachineDebugger::DetectOS(BSTR *a_pbstrName)
{
    LogFlowThisFunc(("\n"));
    CheckComArgNotNull(a_pbstrName);

    /*
     * Do the autocaller and lock bits.
     */
    AutoCaller autoCaller(this);
    HRESULT hrc = autoCaller.rc();
    if (SUCCEEDED(hrc))
    {
        AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
        Console::SafeVMPtr ptrVM(mParent);
        hrc = ptrVM.rc();
        if (SUCCEEDED(hrc))
        {
            /*
             * Do the job and try convert the name.
             */
/** @todo automatically load the DBGC plugins or this is a waste of time. */
            char szName[64];
            int vrc = DBGFR3OSDetect(ptrVM.raw(), szName, sizeof(szName));
            if (RT_SUCCESS(vrc) && vrc != VINF_DBGF_OS_NOT_DETCTED)
            {
                try
                {
                    Bstr bstrName(szName);
                    bstrName.detachTo(a_pbstrName);
                }
                catch (std::bad_alloc)
                {
                    hrc = E_OUTOFMEMORY;
                }
            }
            else
                hrc = setError(VBOX_E_VM_ERROR, tr("DBGFR3OSDetect failed with %Rrc"), vrc);
        }
    }
    return hrc;
}

STDMETHODIMP MachineDebugger::GetRegister(ULONG a_idCpu, IN_BSTR a_bstrName, BSTR *a_pbstrValue)
{
    ReturnComNotImplemented();
}

STDMETHODIMP MachineDebugger::GetRegisters(ULONG a_idCpu, ComSafeArrayOut(BSTR, a_bstrNames), ComSafeArrayOut(BSTR, a_bstrValues))
{
    /*
     * The prologue.
     */
    LogFlowThisFunc(("\n"));
    AutoCaller autoCaller(this);
    HRESULT hrc = autoCaller.rc();
    if (SUCCEEDED(hrc))
    {
        AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
        Console::SafeVMPtr ptrVM(mParent);
        hrc = ptrVM.rc();
        if (SUCCEEDED(hrc))
        {
            /*
             * Real work.
             */
            DBGFREGENTRY aRegs[DBGFREG_ALL_COUNT];
            int vrc = DBGFR3RegCpuQueryAll(ptrVM.raw(), a_idCpu, aRegs, RT_ELEMENTS(aRegs));
            if (RT_SUCCESS(vrc))
            {
                try
                {
                    com::SafeArray<BSTR> abstrNames(RT_ELEMENTS(aRegs));
                    com::SafeArray<BSTR> abstrValues(RT_ELEMENTS(aRegs));

                    for (uint32_t iReg = 0; iReg < RT_ELEMENTS(aRegs); iReg++)
                    {
                        char szHex[128];

                        szHex[0] = '\0';
                        switch (aRegs[iReg].enmType)
                        {
                            case DBGFREGVALTYPE_U8:
                                RTStrFormatNumber(szHex, aRegs[iReg].Val.u8,  16,  2+2, 0, RTSTR_F_SPECIAL | RTSTR_F_ZEROPAD | RTSTR_F_8BIT);
                                break;
                            case DBGFREGVALTYPE_U16:
                                RTStrFormatNumber(szHex, aRegs[iReg].Val.u16, 16,  2+4, 0, RTSTR_F_SPECIAL | RTSTR_F_ZEROPAD | RTSTR_F_16BIT);
                                break;
                            case DBGFREGVALTYPE_U32:
                                RTStrFormatNumber(szHex, aRegs[iReg].Val.u32, 16,  2+8, 0, RTSTR_F_SPECIAL | RTSTR_F_ZEROPAD | RTSTR_F_32BIT);
                                break;
                            case DBGFREGVALTYPE_U64:
                                RTStrFormatNumber(szHex, aRegs[iReg].Val.u64, 16, 2+16, 0, RTSTR_F_SPECIAL | RTSTR_F_ZEROPAD | RTSTR_F_64BIT);
                                break;
                            case DBGFREGVALTYPE_U128:
                                RTStrFormatNumber(szHex, aRegs[iReg].Val.au64[1], 16, 2+16, 0, RTSTR_F_SPECIAL | RTSTR_F_ZEROPAD | RTSTR_F_64BIT);
                                RTStrFormatNumber(&szHex[2+16], aRegs[iReg].Val.au64[0], 16, 16, 0, RTSTR_F_ZEROPAD | RTSTR_F_64BIT);
                                break;
                            case DBGFREGVALTYPE_80:
                                RTStrFormatNumber(szHex, aRegs[iReg].Val.au16[5], 16, 2+4, 0, RTSTR_F_SPECIAL | RTSTR_F_ZEROPAD | RTSTR_F_16BIT);
                                RTStrFormatNumber(&szHex[2+4], aRegs[iReg].Val.au64[0], 16, 16, 0, RTSTR_F_ZEROPAD | RTSTR_F_64BIT);
                                break;
                            case DBGFREGVALTYPE_DTR:
                                RTStrFormatNumber(szHex, aRegs[iReg].Val.dtr.u64Base, 16, 2+16, 0, RTSTR_F_SPECIAL | RTSTR_F_ZEROPAD | RTSTR_F_64BIT);
                                szHex[2+16] = ':';
                                RTStrFormatNumber(&szHex[2+16+1], aRegs[iReg].Val.dtr.u32Limit, 16, 4, 0, RTSTR_F_ZEROPAD | RTSTR_F_32BIT);
                                break;

                            case DBGFREGVALTYPE_LRD:
                            case DBGFREGVALTYPE_END:
                            case DBGFREGVALTYPE_INVALID:
                            case DBGFREGVALTYPE_32BIT_HACK:
                                break;
                        }
                        Assert(szHex[0]);

                        Bstr bstrValue(szHex);
                        bstrValue.detachTo(&abstrValues[iReg]);

                        Bstr bstrName(DBGFR3RegCpuName(aRegs[iReg].enmReg, DBGFREGVALTYPE_INVALID));
                        bstrName.detachTo(&abstrNames[iReg]);
                    }

                    abstrValues.detachTo(ComSafeArrayOutArg(a_bstrNames));
                    abstrValues.detachTo(ComSafeArrayOutArg(a_bstrValues));
                }
                catch (std::bad_alloc)
                {
                    hrc = E_OUTOFMEMORY;
                }
            }
            else
                hrc = setError(E_FAIL, tr("DBGFR3RegQueryAll failed with %Rrc"), vrc);
        }
    }
    return hrc;
}

STDMETHODIMP MachineDebugger::SetRegister(ULONG a_idCpu, IN_BSTR a_bstrName, IN_BSTR a_bstrValue)
{
    ReturnComNotImplemented();
}

STDMETHODIMP MachineDebugger::SetRegisters(ULONG a_idCpu, ComSafeArrayIn(IN_BSTR, a_bstrNames), ComSafeArrayIn(IN_BSTR, a_bstrValues))
{
    ReturnComNotImplemented();
}

STDMETHODIMP MachineDebugger::DumpGuestStack(ULONG a_idCpu, BSTR *a_pbstrStack)
{
    ReturnComNotImplemented();
}

/**
 * Resets VM statistics.
 *
 * @returns COM status code.
 * @param   aPattern            The selection pattern. A bit similar to filename globbing.
 */
STDMETHODIMP MachineDebugger::ResetStats(IN_BSTR aPattern)
{
    Console::SafeVMPtrQuiet pVM (mParent);

    if (!pVM.isOk())
        return setError(VBOX_E_INVALID_VM_STATE, "Machine is not running");

    STAMR3Reset(pVM, Utf8Str(aPattern).c_str());

    return S_OK;
}

/**
 * Dumps VM statistics to the log.
 *
 * @returns COM status code.
 * @param   aPattern            The selection pattern. A bit similar to filename globbing.
 */
STDMETHODIMP MachineDebugger::DumpStats (IN_BSTR aPattern)
{
    Console::SafeVMPtrQuiet pVM (mParent);

    if (!pVM.isOk())
        return setError(VBOX_E_INVALID_VM_STATE, "Machine is not running");

    STAMR3Dump(pVM, Utf8Str(aPattern).c_str());

    return S_OK;
}

/**
 * Get the VM statistics in an XML format.
 *
 * @returns COM status code.
 * @param   aPattern            The selection pattern. A bit similar to filename globbing.
 * @param   aWithDescriptions   Whether to include the descriptions.
 * @param   aStats              The XML document containing the statistics.
 */
STDMETHODIMP MachineDebugger::GetStats (IN_BSTR aPattern, BOOL aWithDescriptions, BSTR *aStats)
{
    Console::SafeVMPtrQuiet pVM (mParent);

    if (!pVM.isOk())
        return setError(VBOX_E_INVALID_VM_STATE, "Machine is not running");

    char *pszSnapshot;
    int vrc = STAMR3Snapshot(pVM, Utf8Str(aPattern).c_str(), &pszSnapshot, NULL,
                             !!aWithDescriptions);
    if (RT_FAILURE(vrc))
        return vrc == VERR_NO_MEMORY ? E_OUTOFMEMORY : E_FAIL;

    /** @todo this is horribly inefficient! And it's kinda difficult to tell whether it failed...
     * Must use UTF-8 or ASCII here and completely avoid these two extra copy operations.
     * Until that's done, this method is kind of useless for debugger statistics GUI because
     * of the amount statistics in a debug build. */
    Bstr(pszSnapshot).detachTo(aStats);

    return S_OK;
}


// public methods only for internal purposes
/////////////////////////////////////////////////////////////////////////////

void MachineDebugger::flushQueuedSettings()
{
    mFlushMode = true;
    if (mSinglestepQueued != ~0)
    {
        COMSETTER(Singlestep) (mSinglestepQueued);
        mSinglestepQueued = ~0;
    }
    if (mRecompileUserQueued != ~0)
    {
        COMSETTER(RecompileUser) (mRecompileUserQueued);
        mRecompileUserQueued = ~0;
    }
    if (mRecompileSupervisorQueued != ~0)
    {
        COMSETTER(RecompileSupervisor) (mRecompileSupervisorQueued);
        mRecompileSupervisorQueued = ~0;
    }
    if (mPatmEnabledQueued != ~0)
    {
        COMSETTER(PATMEnabled) (mPatmEnabledQueued);
        mPatmEnabledQueued = ~0;
    }
    if (mCsamEnabledQueued != ~0)
    {
        COMSETTER(CSAMEnabled) (mCsamEnabledQueued);
        mCsamEnabledQueued = ~0;
    }
    if (mLogEnabledQueued != ~0)
    {
        COMSETTER(LogEnabled) (mLogEnabledQueued);
        mLogEnabledQueued = ~0;
    }
    if (mVirtualTimeRateQueued != ~(uint32_t)0)
    {
        COMSETTER(VirtualTimeRate) (mVirtualTimeRateQueued);
        mVirtualTimeRateQueued = ~0;
    }
    mFlushMode = false;
}

// private methods
/////////////////////////////////////////////////////////////////////////////

bool MachineDebugger::queueSettings() const
{
    if (!mFlushMode)
    {
        // check if the machine is running
        MachineState_T machineState;
        mParent->COMGETTER(State) (&machineState);
        switch (machineState)
        {
            // queue the request
            default:
                return true;

            case MachineState_Running:
            case MachineState_Paused:
            case MachineState_Stuck:
            case MachineState_LiveSnapshotting:
            case MachineState_Teleporting:
                break;
        }
    }
    return false;
}
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