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

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

//++
// File:        MICmdFactory.cpp
//
// Overview:    CMICmdFactory implementation.
//
// Environment: Compilers:  Visual C++ 12.
//                          gcc (Ubuntu/Linaro 4.8.1-10ubuntu9) 4.8.1
//              Libraries:  See MIReadmetxt.
//
// Copyright:   None.
//--

// In-house headers:
#include "MICmdFactory.h"
#include "MICmnResources.h"
#include "MICmdData.h"
#include "MICmdBase.h"
#include "MICmdCommands.h"

//++ ------------------------------------------------------------------------------------
// Details: CMICmdFactory constructor.
// Type:    Method.
// Args:    None.
// Return:  None.
// Throws:  None.
//--
CMICmdFactory::CMICmdFactory(void)
{
}

//++ ------------------------------------------------------------------------------------
// Details: CMICmdFactory destructor.
// Type:    Overridable.
// Args:    None.
// Return:  None.
// Throws:  None.
//--
CMICmdFactory::~CMICmdFactory(void)
{
    Shutdown();
}

//++ ------------------------------------------------------------------------------------
// Details: Initialize resources for *this Command factory.
// Type:    Method.
// Args:    None.
// Return:  MIstatus::success - Functionality succeeded.
//          MIstatus::failure - Functionality failed.
// Throws:  None.
//--
bool
CMICmdFactory::Initialize(void)
{
    m_clientUsageRefCnt++;

    if (m_bInitialized)
        return MIstatus::success;

    m_bInitialized = true;

    MICmnCommands::RegisterAll();

    return MIstatus::success;
}

//++ ------------------------------------------------------------------------------------
// Details: Release resources for *this Command Factory.
// Type:    Method.
// Args:    None.
// Return:  MIstatus::success - Functionality succeeded.
//          MIstatus::failure - Functionality failed.
// Throws:  None.
//--
bool
CMICmdFactory::Shutdown(void)
{
    if (--m_clientUsageRefCnt > 0)
        return MIstatus::success;

    if (!m_bInitialized)
        return MIstatus::success;

    m_mapMiCmdToCmdCreatorFn.clear();

    m_bInitialized = false;

    return MIstatus::success;
}

//++ ------------------------------------------------------------------------------------
// Details: Register a command's creator function with the command identitier the MI
//          command name i.e. 'file-exec-and-symbols'.
// Type:    Method.
// Args:    vMiCmd          - (R) Command's name, the MI command.
//          vCmdCreateFn    - (R) Command's creator function pointer.
// Return:  MIstatus::success - Functionality succeeded.
//          MIstatus::failure - Functionality failed.
// Throws:  None.
//--
bool
CMICmdFactory::CmdRegister(const CMIUtilString &vMiCmd, CmdCreatorFnPtr vCmdCreateFn)
{
    if (!IsValid(vMiCmd))
    {
        SetErrorDescription(CMIUtilString::Format(MIRSRC(IDS_CMDFACTORY_ERR_INVALID_CMD_NAME), vMiCmd.c_str()));
        return MIstatus::failure;
    }
    if (vCmdCreateFn == nullptr)
    {
        SetErrorDescription(CMIUtilString::Format(MIRSRC(IDS_CMDFACTORY_ERR_INVALID_CMD_CR8FN), vMiCmd.c_str()));
        return MIstatus::failure;
    }

    if (HaveAlready(vMiCmd))
    {
        SetErrorDescription(CMIUtilString::Format(MIRSRC(IDS_CMDFACTORY_ERR_CMD_ALREADY_REGED), vMiCmd.c_str()));
        return MIstatus::failure;
    }

    MapPairMiCmdToCmdCreatorFn_t pr(vMiCmd, vCmdCreateFn);
    m_mapMiCmdToCmdCreatorFn.insert(pr);

    return MIstatus::success;
}

//++ ------------------------------------------------------------------------------------
// Details: Check a command is already registered.
// Type:    Method.
// Args:    vMiCmd  - (R) Command's name, the MI command.
// Return:  True - registered.
//          False - not found.
// Throws:  None.
//--
bool
CMICmdFactory::HaveAlready(const CMIUtilString &vMiCmd) const
{
    const MapMiCmdToCmdCreatorFn_t::const_iterator it = m_mapMiCmdToCmdCreatorFn.find(vMiCmd);
    if (it != m_mapMiCmdToCmdCreatorFn.end())
        return true;

    return false;
}

//++ ------------------------------------------------------------------------------------
// Details: Check a command's name is valid:
//              - name is not empty
//              - name does not have spaces
// Type:    Method.
// Args:    vMiCmd  - (R) Command's name, the MI command.
// Return:  True - valid.
//          False - not valid.
// Throws:  None.
//--
bool
CMICmdFactory::IsValid(const CMIUtilString &vMiCmd) const
{
    bool bValid = true;

    if (vMiCmd.empty())
    {
        bValid = false;
        return false;
    }

    const MIint nPos = vMiCmd.find(" ");
    if (nPos != (MIint)std::string::npos)
        bValid = false;

    return bValid;
}

//++ ------------------------------------------------------------------------------------
// Details: Check a command is already registered.
// Type:    Method.
// Args:    vMiCmd  - (R) Command's name, the MI command.
// Return:  True - registered.
//          False - not found.
// Throws:  None.
//--
bool
CMICmdFactory::CmdExist(const CMIUtilString &vMiCmd) const
{
    return HaveAlready(vMiCmd);
}

//++ ------------------------------------------------------------------------------------
// Details: Create a command given the specified MI command name. The command data object
//          contains the options for the command.
// Type:    Method.
// Args:    vMiCmd      - (R) Command's name, the MI command.
//          vCmdData    - (RW) Command's metadata status/information/result object.
//          vpNewCmd    - (W) New command instance.
// Return:  MIstatus::success - Functionality succeeded.
//          MIstatus::failure - Functionality failed.
// Throws:  None.
//--
bool
CMICmdFactory::CmdCreate(const CMIUtilString &vMiCmd, const SMICmdData &vCmdData, CMICmdBase *&vpNewCmd)
{
    bool bOk = MIstatus::success;

    vpNewCmd = nullptr;

    if (!IsValid(vMiCmd))
    {
        SetErrorDescription(CMIUtilString::Format(MIRSRC(IDS_CMDFACTORY_ERR_INVALID_CMD_NAME), vMiCmd.c_str()));
        return MIstatus::failure;
    }
    if (!HaveAlready(vMiCmd))
    {
        SetErrorDescription(CMIUtilString::Format(MIRSRC(IDS_CMDFACTORY_ERR_CMD_NOT_REGISTERED), vMiCmd.c_str()));
        return MIstatus::failure;
    }

    const MapMiCmdToCmdCreatorFn_t::const_iterator it = m_mapMiCmdToCmdCreatorFn.find(vMiCmd);
    const CMIUtilString &rMiCmd((*it).first);
    MIunused(rMiCmd);
    CmdCreatorFnPtr pFn = (*it).second;
    CMICmdBase *pCmd = (*pFn)();

    SMICmdData cmdData(vCmdData);
    cmdData.id = pCmd->GetGUID();
    bOk = pCmd->SetCmdData(cmdData);
    if (bOk)
        vpNewCmd = pCmd;

    return bOk;
}