llvm-project/lldb/tools/lldb-mi/MICmdInvoker.cpp

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

//++
// File:		MICmdInvoker.cpp
//
// Overview:	CMICmdInvoker 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 "MICmdInvoker.h"
#include "MICmdBase.h"
#include "MICmdMgr.h"
#include "MICmnLog.h"
#include "MICmnStreamStdout.h"

//++ ------------------------------------------------------------------------------------
// Details:	CMICmdInvoker constructor.
// Type:	Method.
// Args:	None.
// Return:	None.
// Throws:	None.
//--
CMICmdInvoker::CMICmdInvoker( void )
:	m_rStreamOut( CMICmnStreamStdout::Instance() )
{
}

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

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

	if( m_bInitialized )
		return MIstatus::success;

	m_bInitialized = true;

	return  MIstatus::success;
}

//++ ------------------------------------------------------------------------------------
// Details:	Release resources for *this Stdin stream.
// Type:	Method.
// Args:	None.
// Return:	MIstatus::success - Functional succeeded.
//			MIstatus::failure - Functional failed.
// Throws:	None.
//--
bool CMICmdInvoker::Shutdown( void )
{
	if( --m_clientUsageRefCnt > 0 )
		return MIstatus::success;
	
	if( !m_bInitialized )
		return MIstatus::success;

	CmdDeleteAll();

	m_bInitialized = false;

	return MIstatus::success;
}	

//++ ------------------------------------------------------------------------------------
// Details:	Empty the map of invoked commands doing work. Command objects are deleted too.
// Type:	Method.
// Args:	None.
// Return:	None.
// Throws:	None.
//--
void CMICmdInvoker::CmdDeleteAll( void )
{
	CMICmdMgr & rMgr = CMICmdMgr::Instance();
	MapCmdIdToCmd_t::const_iterator it = m_mapCmdIdToCmd.begin();
	while( it != m_mapCmdIdToCmd.end() )
	{
		const MIuint cmdId( (*it).first );
		CMICmdBase * pCmd = (*it).second;
		const CMIUtilString & rCmdName( pCmd->GetCmdData().strMiCmd );
		rMgr.CmdDelete( pCmd->GetCmdData() );

		// Next
		++it;
	}
	m_mapCmdIdToCmd.clear();
}

//++ ------------------------------------------------------------------------------------
// Details:	Remove from the map of invoked commands doing work a command that has finished
//			its work. The command object is deleted too.
// Type:	Method.
// Args:	vId				- (R) Command object's unique ID.
//			vbYesDeleteCmd	- (R) True = Delete command object, false = delete via the Command Manager.
// Return:	None.
// Throws:	None.
//--
bool CMICmdInvoker::CmdDelete( const MIuint vId, const bool vbYesDeleteCmd /*= false*/ )
{
	CMICmdMgr & rMgr = CMICmdMgr::Instance();
	MapCmdIdToCmd_t::const_iterator it = m_mapCmdIdToCmd.find( vId );
	if( it != m_mapCmdIdToCmd.end() )
	{
		CMICmdBase * pCmd = (*it).second;
		if( vbYesDeleteCmd )
		{
			// Via registered interest command manager callback *this object to delete the command
			m_mapCmdIdToCmd.erase( it );
			delete pCmd;
		}
		else
			// Notify other interested object of this command's pending deletion
			rMgr.CmdDelete( pCmd->GetCmdData() );
	}

	if( m_mapCmdIdToCmd.empty() )
		rMgr.CmdUnregisterForDeleteNotification( *this );

	return MIstatus::success;
}

//++ ------------------------------------------------------------------------------------
// Details:	Add to the map of invoked commands doing work a command that is about to 
//			start to do work.
// Type:	Method.
// Args:	vCmd	- (R) Command object.
// Return:	None.
// Throws:	None.
//--
bool CMICmdInvoker::CmdAdd( const CMICmdBase & vCmd )
{
	if( m_mapCmdIdToCmd.empty() )
	{
		CMICmdMgr & rMgr = CMICmdMgr::Instance();
		rMgr.CmdRegisterForDeleteNotification( *this );
	}

	const MIuint & cmdId( vCmd.GetCmdData().id );
	MapCmdIdToCmd_t::const_iterator it = m_mapCmdIdToCmd.find( cmdId );
	if( it != m_mapCmdIdToCmd.end() )
		return MIstatus::success;

	MapPairCmdIdToCmd_t pr( cmdId, const_cast< CMICmdBase *>( &vCmd ));
	m_mapCmdIdToCmd.insert( pr );

	return MIstatus::success;
}

//++ ------------------------------------------------------------------------------------
// Details:	Having previously had the potential command validated and found valid now
//			get the command executed.
//			If the Functionalityity returns MIstatus::failure call GetErrorDescription().
//			This function is used by the application's main thread.
// Type:	Method.
// Args:	vCmd	- (RW) Command object.
// Return:	MIstatus::success - Functionality succeeded.
//			MIstatus::failure - Functionality failed.
// Throws:	None.
//--
bool CMICmdInvoker::CmdExecute( CMICmdBase & vCmd )
{
	bool bOk = CmdAdd( vCmd );

	if( bOk && !vCmd.ParseArgs() )
	{
		// Report command execution failed
		const SMICmdData cmdData( vCmd.GetCmdData() );
		CmdStdout( cmdData );
		CmdDelete( cmdData.id );

		// Proceed to wait or execute next command
		return MIstatus::success;
	}
	
	if( bOk && !vCmd.Execute() )
	{
		// Report command execution failed
		const SMICmdData cmdData( vCmd.GetCmdData() );
		CmdStdout( cmdData );
		CmdDelete( cmdData.id );

		// Proceed to wait or execute next command
		return MIstatus::success;
	}

	bOk = CmdExecuteFinished( vCmd );

	return bOk;
}

//++ ------------------------------------------------------------------------------------
// Details:	Called when a command has finished its Execution() work either synchronously
//			because the command executed was the type a non event type or asynchronoulsy
//			via the command's callback (because of an SB Listener event). Needs to be called
//			so that *this invoker call do some house keeping and then proceed to call 
//			the command's Acknowledge() function.
// Type:	Method.
// Args:	vCmd	- (R) Command object.
// Return:	MIstatus::success - Functionality succeeded.
//			MIstatus::failure - Functionality failed.
// Throws:	None.
//--
bool CMICmdInvoker::CmdExecuteFinished( CMICmdBase & vCmd )
{
	// Command finished now get the command to gather it's information and form the MI
	// Result record
	if( !vCmd.Acknowledge() )
	{
		// Report command acknowledge functionality failed
		const SMICmdData cmdData( vCmd.GetCmdData() );
		CmdStdout( cmdData );
		CmdDelete( cmdData.id );

		// Proceed to wait or execute next command
		return MIstatus::success;
	}
	
	// Retrieve the command's latest data/information. Needed for commands of the event type so have 
	// a record of commands pending finishing execution.
	const CMIUtilString & rMIResultRecord( vCmd.GetMIResultRecord() );
	SMICmdData cmdData( vCmd.GetCmdData() );		// Make a copy as the command will be deleted soon
	cmdData.strMiCmdResultRecord = rMIResultRecord;	// Precautionary copy as the command might forget to do this
	if( vCmd.HasMIResultRecordExtra() )
	{
		cmdData.bHasResultRecordExtra = true;
		const CMIUtilString & rMIExtra( vCmd.GetMIResultRecordExtra() );
		cmdData.strMiCmdResultRecordExtra = rMIExtra;	// Precautionary copy as the command might forget to do this
	}
	
	// Delete the command object as do not require anymore
	bool bOk = CmdStdout( cmdData );
	bOk = bOk && CmdDelete( vCmd.GetCmdData().id );
		
	return bOk;
}

//++ ------------------------------------------------------------------------------------
// Details:	Write to stdout and the Log file the command's MI formatted result.
// Type:	vCmdData	- (R) A command's information.
// Return:	MIstatus::success - Functionality succeeded.
//			MIstatus::failure - Functionality failed.
// Return:	None.
// Throws:	None.
//--
bool CMICmdInvoker::CmdStdout( const SMICmdData & vCmdData ) const
{
	bool bOk = m_pLog->WriteLog( vCmdData.strMiCmdAll );
	const bool bLock = bOk && m_rStreamOut.Lock();
	bOk = bOk && bLock && m_rStreamOut.WriteMIResponse( vCmdData.strMiCmdResultRecord );
	if( bOk && vCmdData.bHasResultRecordExtra )
	{
		bOk = bOk && m_rStreamOut.WriteMIResponse( vCmdData.strMiCmdResultRecordExtra );
	}
	bOk = bLock && m_rStreamOut.Unlock();
	
	return bOk;
}

//++ ------------------------------------------------------------------------------------
// Details:	Required by the CMICmdMgr::ICmdDeleteCallback. *this object is registered
//			with the Command Manager to receive callbacks when a command is being deleted.
//			An object, *this invoker, does not delete a command object itself but calls
//			the Command Manager to delete a command object. This function is the Invoker's
//			called. 
//			The Invoker owns the command objects and so can delete them but must do it 
//			via the manager so other objects can be notified of the deletion.
// Type:	Method.
// Args:	vCmd	- (RW) Command.
// Return:	None.
// Throws:	None.
//--
void CMICmdInvoker::Delete( SMICmdData & vCmd )
{
	CmdDelete( vCmd.id, true );
}