hanchenye-llvm-project/lldb/tools/lldb-mi/MIDriverBase.cpp

//===-- MIDriverBase.cpp ----------------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

// Third party headers:
#include "lldb/API/SBEvent.h"
#include "lldb/API/SBBroadcaster.h"

// In-house headers:
#include "MIDriverBase.h"

//++ ------------------------------------------------------------------------------------
// Details: CMIDriverBase constructor.
// Type:    Method.
// Args:    None.
// Return:  None.
// Throws:  None.
//--
CMIDriverBase::CMIDriverBase(void)
    : m_pDriverFallThru(nullptr)
    , m_pDriverParent(nullptr)
    , m_bExitApp(false)
{
}

//++ ------------------------------------------------------------------------------------
// Details: CMIDriverBase destructor.
// Type:    Overrideable.
// Args:    None.
// Return:  None.
// Throws:  None.
//--
CMIDriverBase::~CMIDriverBase(void)
{
    m_pDriverFallThru = NULL;
}

//++ ------------------------------------------------------------------------------------
// Details: This function allows *this driver to call on another driver to perform work
//          should this driver not be able to handle the client data input.
// Type:    Overrideable.
//          Check the error message if the function returns a failure.
// Type:    Overridden.
// Args:    vCmd        - (R) Command instruction to interpret.
//          vwErrMsg    - (W) Error description on command failing.
// Return:  MIstatus::success - Command succeeded.
//          MIstatus::failure - Command failed.
// Throws:  None.
//--
bool
CMIDriverBase::DoFallThruToAnotherDriver(const CMIUtilString &vCmd, CMIUtilString &vwErrMsg)
{
    // Do nothing - override and implement. Use m_pDriverFallThru.
    return MIstatus::success;
}

//++ ------------------------------------------------------------------------------------
// Details: This function allows *this driver to call on another driver to perform work
//          should this driver not be able to handle the client data input.
// Type:    Overrideable.
// Args:    vrOtherDriver   - (R) Reference to another driver object.
// Return:  MIstatus::success - Functional succeeded.
//          MIstatus::failure - Functional failed.
// Throws:  None.
//--
bool
CMIDriverBase::SetDriverToFallThruTo(const CMIDriverBase &vrOtherDriver)
{
    MIunused(vrOtherDriver);

    // Do nothing - override and implement. Set m_pDriverFallThru.

    return MIstatus::success;
}

//++ ------------------------------------------------------------------------------------
// Details: This function allows *this driver to call functionality on the parent driver
//          ask for information for example.
// Type:    Overrideable.
// Args:    vrOtherDriver     - (R) Reference to another driver object.
// Return:  MIstatus::success - Functional succeeded.
//          MIstatus::failure - Functional failed.
// Throws:  None.
//--
bool
CMIDriverBase::SetDriverParent(const CMIDriverBase &vrOtherDriver)
{
    MIunused(vrOtherDriver);

    // Do nothing - override and implement. Set m_pDriverParent.

    return MIstatus::success;
}

//++ ------------------------------------------------------------------------------------
// Details: Retrieve the parent driver to *this driver if one assigned. If assigned *this
//          is the pass through driver that the parent driver passes work to.
// Type:    Method.
// Args:    None.
// Return:  CMIDriverBase * - Pointer to a driver object.
//                          - NULL = there is not parent to *this driver.
// Throws:  None.
//--
CMIDriverBase *
CMIDriverBase::GetDriversParent(void) const
{
    return m_pDriverParent;
}

//++ ------------------------------------------------------------------------------------
// Details: Retrieve the pointer to the other fall through driver *this driver is using
//          (or not using).
// Type:    Method.
// Args:    None.
// Return:  CMIDriverBase * - Pointer to other driver.
//                          - NULL if no driver set.
// Throws:  None.
//--
CMIDriverBase *
CMIDriverBase::GetDriverToFallThruTo(void) const
{
    return m_pDriverFallThru;
}

//++ ------------------------------------------------------------------------------------
// Details: *this driver provides a file stream to other drivers on which *this driver
//          write's out to and they read as expected input. *this driver is passing
//          through commands to the (child) pass through assigned driver.
// Type:    Overrideable.
// Args:    None.
// Return:  FILE * - Pointer to stream.
// Throws:  None.
//--
FILE *
CMIDriverBase::GetStdin(void) const
{
    // Do nothing - override and implement
    return nullptr;
}

//++ ------------------------------------------------------------------------------------
// Details: *this driver provides a file stream to other pass through assigned drivers
//          so they know what to write to.
// Type:    Overrideable.
// Args:    None.
// Return:  FILE * - Pointer to stream.
// Throws:  None.
//--
FILE *
CMIDriverBase::GetStdout(void) const
{
    // Do nothing - override and implement
    return nullptr;
}

//++ ------------------------------------------------------------------------------------
// Details: *this driver provides a error file stream to other pass through assigned drivers
//          so they know what to write to.
// Type:    Overrideable.
// Args:    None.
// Return:  FILE * - Pointer to stream.
// Throws:  None.
//--
FILE *
CMIDriverBase::GetStderr(void) const
{
    // Do nothing - override and implement
    return nullptr;
}

//++ ------------------------------------------------------------------------------------
// Details: Set the MI Driver's exit application flag. The application checks this flag
//          after every stdin line is read so the exit may not be instantious.
//          If vbForceExit is false the MI Driver queries its state and determines if is
//          should exit or continue operating depending on that running state.
// Type:    Overrideable.
// Args:    vbForceExit - (R) True = Do not query, set state to exit, false = query if can/should exit right now.
// Return:  None.
// Throws:  None.
//--
void
CMIDriverBase::SetExitApplicationFlag(const bool vbForceExit)
{
    MIunused(vbForceExit);

    // Do nothing - override and implement
}