torc/physical/ModuleTransformer.hpp

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// Torc - Copyright 2011 University of Southern California.  All Rights Reserved.
// $HeadURL: https://torc-isi.svn.sourceforge.net/svnroot/torc-isi/branches/staging/0.9/src/torc/physical/ModuleTransformer.hpp $
// $Id: ModuleTransformer.hpp 10 2011-10-12 18:40:16Z nsteiner $

// This program is free software: you can redistribute it and/or modify it under the terms of the 
// GNU General Public License as published by the Free Software Foundation, either version 3 of the 
// License, or (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
// without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See 
// the GNU General Public License for more details.
// 
// You should have received a copy of the GNU General Public License along with this program.  If 
// not, see <http://www.gnu.org/licenses/>.

/// \file
/// \brief ModuleTransformer class to modularize/flatten designs.

#ifndef TORC_PHYSICAL_MODULETRANSFORMER_HPP
#define TORC_PHYSICAL_MODULETRANSFORMER_HPP

#include "torc/Architecture.hpp"
#include "torc/physical/Factory.hpp"
#include <boost/lexical_cast.hpp>

using namespace std;
using namespace torc::architecture;
using namespace torc::architecture::xilinx;

namespace torc {
namespace physical {

    /// \brief Utility class to modularize/flatten designs.
    class ModuleTransformer {

    protected:
    // typedefs
        /// \brief Imported type.
        typedef Design::InstanceSharedPtrConstIterator InstanceSharedPtrConstIterator;
        /// \brief Imported type.
        typedef Design::NetSharedPtrIterator NetSharedPtrIterator;
        /// \brief Imported type.
        typedef Design::ModuleSharedPtrIterator ModuleSharedPtrIterator;
        /// \brief Imported type.
        typedef Design::InstanceSharedPtrIterator InstanceSharedPtrIterator;
        /// \brief Imported type.
        typedef Module::PortSharedPtrConstIterator PortSharedPtrConstIterator;
        /// \brief Imported type.
        typedef Net::InstancePinSharedPtrIterator InstancePinSharedPtrIterator;
        /// \brief Imported type.
        typedef Net::InstancePinSharedPtrConstIterator InstancePinSharedPtrConstIterator;
        /// \brief Imported type.
        typedef Net::PipConstIterator PipConstIterator;
    // members
        /// \brief Design pointer.
        DesignSharedPtr mDesignPtr;
        /// \brief Hierarchy separator.
        static const string sHierarchySeparator;
        /// \brief Port index separator.
        static const string sPortIndexSeparator;
        /// \brief Valid characters in a pin name.
        static const boost::regex sValidPinNameCharactersRegEx;
        /// \brief Invalid first characters in a pin name.
        static const boost::regex sInvalidPinNameFirstCharactersRegEx;
    // types
        /// \brief Net connectivity with respect to module instance, either not connected
        ///     to module, internal to module, or external to module.
        enum ENetConnectivity {
            eNetConnectivityNotConnected = 0, eNetConnectivityInternal, eNetConnectivityExternal
        };

    public:
        // constructors
        /// \brief Public constructor.
        /// \param inDesignPtr Pointer to the design.
        ModuleTransformer(DesignSharedPtr& inDesignPtr) : mDesignPtr(inDesignPtr) {}

        /// \brief Group a set of instances into a module.
        /// \param inInstances The vector of instances to group.
        /// \param inModuleDefinitionName The module definition name.
        /// \param inModuleInstanceName The module instance name.
        /// \param inKeepPlacement A flag specifying whether placement should be retained after 
        ///     modularization.  Default to false.
        /// \param inKeepRouting A flag specifying whether routing should be retained afer 
        ///     modularization.  Defaults to false.
        /*
         * Function pseudocode
         *
         * bool modularize(InstanceSharedPtrVector inInstances,
         *                 string inModuleDefinitionName,
         *                 string inModuleInstanceNamebool,
         *                 bool inKeepPlacement = false,
         *                 bool inKeepRouting = false)
         * {
         *   if(inInstances size == 0)
         *   {
         *     warn user that inInstances is empty;
         *     return false;
         *   }
         *   create module definition, anchor point is first instance in inInstances;
         *   create module instance, placed where anchor point is placed;
         *   //handle instances
         *   iterate over inInstances
         *   {
         *     if(instance not found)
         *     {
         *       warn user that instance not found;
         *       return false;
         *     }
         *     if(!inKeepPlacement) unplace instance;
         *     move instance from design to module definition;
         *   }
         *   //handle nets
         *   iterate over design nets
         *   {
         *     if(!inKeepRouting) unroute net;
         *     if(net is internal to module)
         *     {
         *       move net from design to module definition;
         *     }
         *     else if(net is external to module)
         *     {
         *       //handle net sources
         *       iterate over net sources
         *       {
         *         if(source connects to instance in module definition)
         *         {
         *           create port for module definition;
         *           update net outpin;
         *         }
         *       }
         *       //handle net sinks
         *       iterate over net sinks
         *       {
         *         if(sink connects to instance in module definition)
         *         {
         *           create port for module definition;
         *           update net inpin;
         *         }
         *       }
         *     }
         *   }
         *   add module definition and instance to design;
         *   return true;
         * }
         */
        bool modularize(const InstanceSharedPtrVector& inInstances, 
            const string& inModuleDefinitionName, const string& inModuleInstanceName, 
            bool inKeepPlacement = false, bool inKeepRouting = false) {

            // Get a current iterator to inInstances
            InstanceSharedPtrConstIterator inInstanceSharedPtrConstIter = inInstances.begin();
            // Get an end iterator to inInstances
            InstanceSharedPtrConstIterator inInstanceSharedPtrConstEnd = inInstances.end();

            // Check if inInstances is empty
            if(inInstanceSharedPtrConstIter == inInstanceSharedPtrConstEnd) {

                // Warn the user that none of the instances specified are found in the design
                std::clog << "WARNING: There were no instances specified to be modularized. "
                    << std::endl;

                // Operation did not complete successfully
                return false;

            }

            // Set the first returned instance as a reference point
            InstanceSharedPtr moduleReferenceInst = *inInstanceSharedPtrConstIter;
            // Create module definition
            ModuleSharedPtr moduleDefinition = Factory::newModulePtr(inModuleDefinitionName,
                moduleReferenceInst->getName());
            // Create module instance
            InstanceSharedPtr moduleInst = Factory::newInstancePtr(inModuleInstanceName,
                inModuleDefinitionName, moduleReferenceInst->getTile(),
                moduleReferenceInst->getSite());

            // Unplace module instance if so requested
            if(!inKeepPlacement) moduleInst->unplace();

            // Begin handle instances
            // Iterate over all instances in inInstances
            while(inInstanceSharedPtrConstIter != inInstanceSharedPtrConstEnd) {

                // Get a pointer to the current instance
                InstanceSharedPtr instPtr = *inInstanceSharedPtrConstIter;

                // Look for the current instance in the design
                InstanceSharedPtrConstIterator instPtrIter 
                    = mDesignPtr->findInstance(instPtr->getName());

                // Warn if the instance was not found
                if(instPtrIter == mDesignPtr->instancesEnd()) {

                    // Warn the user that the instance was not found in the design.
                    std::clog << "WARNING: Instance " << instPtr->getName()
                        << "was not found in design " << mDesignPtr->getName() << std::endl;
                    // Operation did not complete successfully
                    return false;

                }

                // Get a pointer to the looked up instance
                InstanceSharedPtr designInstPtr = *instPtrIter;

                // Unplace instance if so requested
                if(!inKeepPlacement) designInstPtr->unplace();

                // Add instance to module
                moduleDefinition->addInstance(designInstPtr);
                // Remove instance from design
                mDesignPtr->removeInstance(designInstPtr);

                // Move to next instance
                inInstanceSharedPtrConstIter++;

            } // while(inInstanceSharedPtrConstIter != inInstanceSharedPtrConstEnd)
            // End handle instances

            // Begin handle connectivity
            // Get a begin iterator to design nets
            NetSharedPtrIterator designNetsIter = mDesignPtr->netsBegin();
            // Get an end iterator to design nets
            NetSharedPtrIterator designNetsEnd = mDesignPtr->netsEnd();
            // Get a begin iterator to module hosted instances
            InstanceSharedPtrConstIterator modHostedInstPtrConstBegin 
                = moduleDefinition->instancesBegin();
            // Get an end iterator to module hosted instances
            InstanceSharedPtrConstIterator modHostedInstPtrConstEnd 
                = moduleDefinition->instancesEnd();
            // Module instance source pins
            InstancePinSharedPtrVector modInstSourcePinPtrVector;
            // Module instance sink pins
            InstancePinSharedPtrVector modInstSinkPinPtrVector;

            // Iterate over all design nets
            while(designNetsIter != designNetsEnd) {

                // Get a pointer to the current net
                NetSharedPtr designNetPtr = *designNetsIter;
                // Compute net connectivity type
                ENetConnectivity eNet = getNetConnectivity(modHostedInstPtrConstBegin,
                    modHostedInstPtrConstEnd, designNetPtr);

                // For internal nets, move net from design to module
                if(eNet == eNetConnectivityInternal) {

                    // Unroute the net if so requested
                    if(!inKeepRouting) designNetPtr->unroute();

                    // Add net to module
                    moduleDefinition->addNet(designNetPtr);
                    // Remove net from design
                    mDesignPtr->removeNet(designNetPtr);
                    // Update designNetsEnd iterator
                    designNetsEnd = mDesignPtr->netsEnd();

                } else {

                    // For unconnected nets, increment the iterator and continue looping
                    if(eNet == eNetConnectivityNotConnected) {

                        // Move to next net
                        designNetsIter++;
                        continue;

                    }

                    // For external nets, expose corresponding pins and update connectivity
                    // Unroute the net if so requested
                    if(!inKeepRouting) designNetPtr->unroute();

                    // Get a begin iterator to net sources
                    InstancePinSharedPtrIterator designNetSourcesIter 
                        = designNetPtr->sourcesBegin();
                    // Get an end iterator to net sources
                    InstancePinSharedPtrIterator designNetSourcesEnd = designNetPtr->sourcesEnd();
                    // Wire index used when creating ports
                    u_int32_t portIndex = 0;

                    // Iterate over all net sources
                    while(designNetSourcesIter != designNetSourcesEnd) {

                        // Get a pointer to the current net source pin
                        InstancePinSharedPtr instPinPtr = *designNetSourcesIter;
                        // Get a pointer to the instance hosting the net source pin
                        InstanceSharedPtr pinInstPtr = instPinPtr->getInstancePtr().lock();

                        // Look for the instance in the vector of instances
                        if((std::find(modHostedInstPtrConstBegin, modHostedInstPtrConstEnd,
                            pinInstPtr)) != modHostedInstPtrConstEnd) {

                            // Build port name: netName_portIndex
                            string portName = sanitizePinName(designNetPtr->getName())
                                + sPortIndexSeparator 
                                + boost::lexical_cast<std::string>(portIndex++);
                            // Create port
                            PortSharedPtr portPtr = Factory::newPortPtr(portName, *(std::find(
                                modHostedInstPtrConstBegin, modHostedInstPtrConstEnd,
                                pinInstPtr)), instPinPtr->getPinName());
                            // Add port to module
                            moduleDefinition->addPort(portPtr);
                            // Create source pin from the module instance
                            modInstSourcePinPtrVector.push_back(
                                Factory::newInstancePinPtr(moduleInst, portName));
                            // Remove old source pin from net
                            designNetPtr->removeSource(instPinPtr);
                            // Update designNetSourcesEnd iterator
                            designNetSourcesEnd = designNetPtr->sourcesEnd();

                        } else {

                            // Move to next source
                            designNetSourcesIter++;

                        }
                    } // while(designNetSourcesIter != designNetSourcesEnd)

                    // Get a begin iterator to module source pins
                    InstancePinSharedPtrIterator modInstSourcesIter =
                        modInstSourcePinPtrVector.begin();
                    // Get an end iterator to module source pins
                    InstancePinSharedPtrIterator modInstSourcesEnd =
                        modInstSourcePinPtrVector.end();

                    // Update net sources with new source pins
                    while(modInstSourcesIter != modInstSourcesEnd) {

                        // Add source pin to net
                        designNetPtr->addSource(*modInstSourcesIter);
                        // Move to next source
                        modInstSourcesIter++;

                    }

                    // Reset module instance source pins vector
                    modInstSourcePinPtrVector.clear();
                    // Get a begin iterator to net sinks
                    InstancePinSharedPtrIterator designNetSinksIter = designNetPtr->sinksBegin();
                    // Get an end iterator to net sinks
                    InstancePinSharedPtrIterator designNetSinksEnd = designNetPtr->sinksEnd();

                    // Iterate over all net sinks
                    while(designNetSinksIter != designNetSinksEnd) {

                        // Get a pointer to the current net sink pin
                        InstancePinSharedPtr instPinPtr = *designNetSinksIter;
                        // Get a pointer to the instance hosting the net source pin
                        InstanceSharedPtr pinInstPtr = instPinPtr->getInstancePtr().lock();

                        // Look for the instance in the vector of instances
                        if((std::find(modHostedInstPtrConstBegin, modHostedInstPtrConstEnd,
                            pinInstPtr)) != modHostedInstPtrConstEnd) {

                            // Build port name: netName_portIndex
                            string portName = sanitizePinName(designNetPtr->getName())
                                + sPortIndexSeparator + boost::lexical_cast<std::string>(
                                portIndex++);
                            // Create port
                            PortSharedPtr portPtr = Factory::newPortPtr(portName, *(std::find(
                                modHostedInstPtrConstBegin, modHostedInstPtrConstEnd,
                                pinInstPtr)), instPinPtr->getPinName());
                            // Add port to module
                            moduleDefinition->addPort(portPtr);
                            // Create sink pin to the module instance
                            modInstSinkPinPtrVector.push_back(Factory::newInstancePinPtr(
                                moduleInst, portName));
                            // Remove old sink pin from net
                            designNetPtr->removeSink(instPinPtr);
                            // Update designNetSinksEnd iterator
                            designNetSinksEnd = designNetPtr->sinksEnd();

                        } else {

                            // Move to next sink
                            designNetSinksIter++;

                        }
                    } // while(designNetSinksIter != designNetSinksEnd)

                    // Get a begin iterator to module sink pins
                    InstancePinSharedPtrIterator modInstSinksIter =
                        modInstSinkPinPtrVector.begin();
                    // Get an end iterator to module sink pins
                    InstancePinSharedPtrIterator modInstSinksEnd =
                        modInstSinkPinPtrVector.end();

                    // Update net sources with new source pins
                    while(modInstSinksIter != modInstSinksEnd) {

                        // Add sink pin to net
                        designNetPtr->addSink(*modInstSinksIter);
                        // Move to next sink
                        modInstSinksIter++;

                    }

                    // Reset module instance sink pins vector
                    modInstSinkPinPtrVector.clear();

                    // Move to next net
                    designNetsIter++;

                } // else
            } // while(designNetsIter != designNetsEnd)
            // End handle connectivity

            // Add module to design
            mDesignPtr->addModule(moduleDefinition);
            // Add module instance to design
            mDesignPtr->addInstance(moduleInst);

            // Operation successfully completed
            return true;
        }

        /// \brief Flatten a module instance in a design.
        /// \param inModuleInstanceName The name of the module instance to be flattened.
        /// \param inKeepPlacement A flag specifying whether placement should be retained after 
        ///     flattening.  Default to false.
        /// \param inKeepRouting A flag specifying whether routing should be retained afer 
        ///     flattening.  Defaults to false.
        /*
         * Function pseudocode
         *
         * bool flatten(const string& inModuleInstanceName, bool inKeepPlacement = false,
         *              bool inKeepRouting = false)
         * {
         *   locate module instance in design;
         *   if(module instance not found)
         *   {
         *     warn user that module instance was not found;
         *     return false;
         *   }
         *   locate module definition corresponding to module instance in design;
         *   if(module definition not found)
         *   {
         *     warn user that module definition was not found;
         *     return false;
         *   }
         *   //handle instances
         *   iterate over module definition instances
         *   {
         *     clone every instance and set its name to moduleInstance/instanceName;
         *     if(!inKeepPlacement) unplace instance;
         *     add instance clone to design;
         *   }
         *   //handle internal nets
         *   iterate over module definition internal nets
         *   {
         *     clone every net and set its name to moduleInstance/netName;
         *     if(!inKeepRouting) unroute net;
         *     add net clone to design;
         *   }
         *   //handle external nets
         *   iterate over all design nets
         *   {
         *     if(!inKeepRouting) unroute net;
         *     //handle net sources
         *     iterate over all sources of a net
         *     {
         *       if(source is a port of the module)
         *       {
         *         update net outpin to reflect the flattened instance and the corresponding pin 
         *           that matches the port;
         *       }
         *     }
         *     //handle net sinks
         *     iterate over all sinks of a net
         *     {
         *       if(sink is a port of the module)
         *       {
         *         update net inpin to reflect the flattened instance and the corresponding pin 
         *           that matches the port;
         *       }
         *     }
         *   }
         *   remove module instance from design;
         * }
         */
        bool flatten(const string& inModuleInstanceName, bool inKeepPlacement = false,
            bool inKeepRouting = false) {

            // Flattened module source pins
            InstancePinSharedPtrVector flattenedModuleSourcePinPtrVector;
            // Flattened module sink pins
            InstancePinSharedPtrVector flattenedModuleSinkPinPtrVector;
            // Look for the module instance in the design
            InstanceSharedPtrConstIterator designModInstPtrConstIter 
                = mDesignPtr->findInstance(inModuleInstanceName);

            // Check for a non-existent module instance
            if(designModInstPtrConstIter == mDesignPtr->instancesEnd()) {

                // Warn the user that the module instance was not found in the design
                std::clog << "WARNING: Module instance of name " << inModuleInstanceName
                    << " was not found in design " << mDesignPtr->getName() << "." << std::endl;

                // Operation did not complete successfully
                return false;

            }

            // Get a pointer to the instance
            InstanceSharedPtr instPtr = *designModInstPtrConstIter;
            // Look for the module in the design
            ModuleSharedPtrIterator designModPtrConstIter 
                = mDesignPtr->findModule(instPtr->getType());

            // Check for a non-existent module
            if(designModPtrConstIter == mDesignPtr->modulesEnd()) {

                // Warn the user that the module was not found in the design
                std::clog << "WARNING: Module of name " << instPtr->getType()
                    << " was not found in design " << mDesignPtr->getName() << "." << std::endl;

                // Operation did not complete successfully
                return false;

            }

            // Current design module
            ModuleSharedPtr module = *designModPtrConstIter;

            // Check whether tile/site for module instance is same as tile/site for module def.
            // In case they don't match, the flattened module instance will be unplaced and any
            // external/internal nets to the module instance will be unrouted.
            InstanceSharedPtrIterator moduleAnchorInstIterator 
                = module->findInstance(module->getAnchor());
            InstanceSharedPtr moduleAnchorInst = *moduleAnchorInstIterator;
            // Begin handle instances inside module
            // Get a begin iterator to module instances
            InstanceSharedPtrIterator moduleInstancesIter = module->instancesBegin();
            // Get an end iterator to module instances
            InstanceSharedPtrIterator moduleInstancesEnd = module->instancesEnd();

            // Iterate over all instances hosted by the module
            while(moduleInstancesIter != moduleInstancesEnd) {

                // Get a pointer to the current instance hosted by the module
                InstanceSharedPtr modInstPtr = *moduleInstancesIter;
                // Clone the instance
                InstanceSharedPtr modInstPtrClone = cloneInstance(modInstPtr,
                    inModuleInstanceName + sHierarchySeparator + modInstPtr->getName());
                // Set clone instance reference
                modInstPtrClone->setInstanceReferencePtr(Factory::newInstanceReferencePtr(
                    inModuleInstanceName, module, modInstPtr));

                // Unplace the instance if so requested
                if(!inKeepPlacement) modInstPtrClone->unplace();

                // Add clone of instance to design
                mDesignPtr->addInstance(modInstPtrClone);

                // Next instance
                moduleInstancesIter++;

            } // while(moduleInstancesIter != moduleInstancesEnd)
            // End handle instances inside module

            // Begin handle internal module nets
            // Get a begin iterator to module nets
            NetSharedPtrIterator moduleNetsIter = module->netsBegin();
            // Get an end iterator to module nets
            NetSharedPtrIterator moduleNetsEnd = module->netsEnd();

            // Iterate over all nets inside module
            while(moduleNetsIter != moduleNetsEnd) {

                // Get a pointer to the current net
                NetSharedPtr moduleNetPtr = *moduleNetsIter;
                // Clone the net
                NetSharedPtr moduleNetPtrClone = cloneNet(moduleNetPtr, inModuleInstanceName
                    + sHierarchySeparator + moduleNetPtr->getName(), inModuleInstanceName);

                // Unroute the net if so requested
                if(!inKeepRouting) moduleNetPtrClone->unroute();

                // Add net to design
                mDesignPtr->addNet(moduleNetPtrClone);
                // Next net
                moduleNetsIter++;

            } // End handle internal module nets

            // Begin handle external module nets
            // Get a begin iterator to design nets
            NetSharedPtrIterator designNetsIter = mDesignPtr->netsBegin();
            // Get an end iterator to design nets
            NetSharedPtrIterator designNetsEnd = mDesignPtr->netsEnd();

            // Iterate over all nets connected to module and other instances outside module
            while(designNetsIter != designNetsEnd) {

                // Get a pointer to the current net
                NetSharedPtr designNetPtr = *designNetsIter;

                // Get a begin iterator to net sources
                InstancePinSharedPtrIterator designNetSourcesIter = designNetPtr->sourcesBegin();
                // Get an end iterator to net sources
                InstancePinSharedPtrIterator designNetSourcesEnd = designNetPtr->sourcesEnd();

                // Iterate over all net sources
                while(designNetSourcesIter != designNetSourcesEnd) {

                    // Net pin
                    InstancePinSharedPtr instPinPtr = *designNetSourcesIter;
                    // Pin instance
                    InstanceSharedPtr pinInstPtr = instPinPtr->getInstancePtr().lock();

                    // Net connects to module instance
                    if(pinInstPtr == instPtr) {

                        // Unroute the net if so requested
                        if(!inKeepRouting) designNetPtr->unroute();

                        // Look for the port in the module
                        PortSharedPtrConstIterator modulePortConstIter 
                            = module->findPort(instPinPtr->getPinName());

                        // Check if port was found
                        if(modulePortConstIter != module->portsEnd()) {

                            // Get a pointer to the current port
                            PortSharedPtr modPortPtr = *modulePortConstIter;
                            // Get module port reference instance
                            InstanceSharedPtr portInstPtr = modPortPtr->getInstancePtr().lock();
                            // Find the cloned instance corresponding to the pin reference instance
                            InstanceSharedPtrIterator pinInstPtrCloneItr 
                                = mDesignPtr->findInstance(inModuleInstanceName
                                + sHierarchySeparator + portInstPtr->getName());
                            // Create new pin referencing the port reference instance
                            flattenedModuleSourcePinPtrVector.push_back(
                                Factory::newInstancePinPtr(*pinInstPtrCloneItr,
                                modPortPtr->getPinName()));
                            // Remove pin reference module instance
                            designNetPtr->removeSource(instPinPtr);
                            // Update designNetSourcesEnd iterator
                            designNetSourcesEnd = designNetPtr->sourcesEnd();

                        }

                    } else {

                        // Move to next source
                        designNetSourcesIter++;

                    }
                } // while(designNetSourcesIter != designNetSourcesEnd)

                // Get a begin iterator to flattened module source pins
                InstancePinSharedPtrIterator flattenedModuleSourcesIter 
                    = flattenedModuleSourcePinPtrVector.begin();
                // Get an end iterator to flattened module source pins
                InstancePinSharedPtrIterator flattenedModuleSourcesEnd 
                    = flattenedModuleSourcePinPtrVector.end();

                // Update net sources with new source pins
                while(flattenedModuleSourcesIter != flattenedModuleSourcesEnd) {

                    // Add source pin to net
                    designNetPtr->addSource(*flattenedModuleSourcesIter);
                    // Move to next source
                    flattenedModuleSourcesIter++;
                }

                // Reset vector
                flattenedModuleSourcePinPtrVector.clear();
                // Get a begin iterator to net sinks
                InstancePinSharedPtrIterator designNetSinksIter = designNetPtr->sinksBegin();
                // Get an end iterator to net sinks
                InstancePinSharedPtrIterator designNetSinksEnd = designNetPtr->sinksEnd();

                // Iterate over all net sinks
                while(designNetSinksIter != designNetSinksEnd) {

                    // Net pin
                    InstancePinSharedPtr instPinPtr = *designNetSinksIter;
                    // Pin instance
                    InstanceSharedPtr pinInstPtr = instPinPtr->getInstancePtr().lock();

                    // Net connets to module instance
                    if(pinInstPtr == instPtr) {

                        // Unroute the net if so requested
                        if(!inKeepRouting) designNetPtr->unroute();

                        // Look for the port in the module
                        PortSharedPtrConstIterator modulePortConstIter 
                            = module->findPort(instPinPtr->getPinName());

                        // Check if port was found
                        if(modulePortConstIter != module->portsEnd()) {

                            // Get a pointer to the current port
                            PortSharedPtr modPortPtr = *modulePortConstIter;
                            // Get module port reference instance
                            InstanceSharedPtr portInstPtr = modPortPtr->getInstancePtr().lock();
                            // Find the cloned instance corresponding to the pin reference instance
                            InstanceSharedPtrIterator pinInstPtrCloneItr 
                                = mDesignPtr->findInstance(inModuleInstanceName
                                + sHierarchySeparator + portInstPtr->getName());
                            // Create new pin referencing the port reference instance
                            flattenedModuleSinkPinPtrVector.push_back(
                                Factory::newInstancePinPtr(*pinInstPtrCloneItr,
                                modPortPtr->getPinName()));
                            // Remove pin reference module instance
                            designNetPtr->removeSink(instPinPtr);
                            // Update designNetSinksEnd iterator
                            designNetSinksEnd = designNetPtr->sinksEnd();
                        }

                    } else {

                        // Move to next source
                        designNetSinksIter++;

                    }
                } // while(designNetSinksIter != designNetSinksEnd)

                // Get a begin iterator to flattened module sink pins
                InstancePinSharedPtrIterator flattenedModuleSinksBegin 
                    = flattenedModuleSinkPinPtrVector.begin();
                // Get an end iterator to flattened module sink pins
                InstancePinSharedPtrIterator flattenedModuleSinksEnd 
                    = flattenedModuleSinkPinPtrVector.end();

                // Update net sources with new source pins
                while(flattenedModuleSinksBegin != flattenedModuleSinksEnd) {

                    // Add sink pin to net
                    designNetPtr->addSink(*flattenedModuleSinksBegin);
                    // Move to next sink
                    flattenedModuleSinksBegin++;

                }

                // Reset vector
                flattenedModuleSinkPinPtrVector.clear();

                // Move to next net
                designNetsIter++;

            } // while(designNetsIter != designNetsEnd)
            // End handle external module nets

            // Remove module instance from design
            mDesignPtr->removeInstance(instPtr);

            // Operation successfully completed
            return true;
        }

    private:

        /// \brief Generate net connectivity type based on module boundary.
        /// \param inInstanceSharedPtrConstBegin A begin iterator to instances contained in module.
        /// \param inInstanceSharedPtrConstEnd An end iterator to instances contained in module.
        /// \param inNetPtr A pointer to a net.
        ENetConnectivity getNetConnectivity(
            InstanceSharedPtrConstIterator inInstanceSharedPtrConstBegin,
            InstanceSharedPtrConstIterator inInstanceSharedPtrConstEnd, NetSharedPtr inNetPtr) {

            // Net connectivity type
            ENetConnectivity netConnectivity = eNetConnectivityNotConnected;
            // Is net connected to module?
            bool isNetConnectedToModule = false;
            // Is net crossing module boundary?
            bool isNetInterToModule = false;
            // Get a begin iterator to net sources
            InstancePinSharedPtrIterator sourcesBegin = inNetPtr->sourcesBegin();
            // Get an end iterator to net sources
            InstancePinSharedPtrIterator sourcesEnd = inNetPtr->sourcesEnd();

            // Iterate over all sources
            while(sourcesBegin != sourcesEnd) {

                // Get a pointer to the current source pin
                InstancePinSharedPtr instPinPtr = *sourcesBegin;
                // Get a pointer to the instance that hosts the pin
                InstanceSharedPtr pinInst = instPinPtr->getInstancePtr().lock();

                // Look for the instance in the vector of instances
                if((std::find(inInstanceSharedPtrConstBegin, inInstanceSharedPtrConstEnd, pinInst))
                    != inInstanceSharedPtrConstEnd) {

                    // Net connects to instance inside module boundary
                    isNetConnectedToModule = true;

                } else {

                    // Net connects to instance outside module boundary
                    isNetInterToModule = true;

                }

                // Move to next source
                sourcesBegin++;
            }

            // Get a begin iterator to net sinks
            InstancePinSharedPtrIterator sinksBegin = inNetPtr->sinksBegin();
            // Get an end iterator to net sinks
            InstancePinSharedPtrIterator sinksEnd = inNetPtr->sinksEnd();

            // Iterate over all sinks
            while(sinksBegin != sinksEnd) {

                // Get a pointer to the current sink pin
                InstancePinSharedPtr instPinPtr = *sinksBegin;
                // Get a pointer to the instance that hosts the pin
                InstanceSharedPtr pinInst = instPinPtr->getInstancePtr().lock();
                // Look for the instance in the vector of instances
                if((std::find(inInstanceSharedPtrConstBegin, inInstanceSharedPtrConstEnd, pinInst))
                    != inInstanceSharedPtrConstEnd) {
                    // Net connects to instance inside module boundary
                    isNetConnectedToModule = true;
                } else {
                    // Net connects to instance outside module boundary
                    isNetInterToModule = true;
                }
                // Move to the next sink
                sinksBegin++;
            }

            if(isNetConnectedToModule) { // Net connects to module
                if(isNetInterToModule) {
                    netConnectivity = eNetConnectivityExternal; // Net crosses module boundary
                } else {
                    netConnectivity = eNetConnectivityInternal; // Net lies within module boundary
                }
            }

            // Return net connectivity type
            return netConnectivity;
        }

        /// \brief Sanitize a pin name.
        /// \param inPinName The pin name to be sanitized.
        string sanitizePinName(string inPinName) {

            // Sanitized pin name
            string sanitizedPinName;

            // Iterate over all characters in inString
            for(u_int32_t i = 0; i < inPinName.length(); i++) {

                // Match character against valid characters
                if(boost::regex_match(inPinName.substr(i, 1), sValidPinNameCharactersRegEx)) {
                    sanitizedPinName += inPinName.substr(i, 1);
                }
            }

            // Make sure sanitizedPinName does not start with an invalid first character
            while(sanitizedPinName.size() > 0 && boost::regex_match(sanitizedPinName.substr(0, 1),
                sInvalidPinNameFirstCharactersRegEx)) {

                // Remove invalid character
                sanitizedPinName = sanitizedPinName.substr(1, sanitizedPinName.size() - 1);

            }

            // Return sanitizedPinName
            return sanitizedPinName;
        }

        /// \brief Clone an instance.
        /// \param inIntancePtr A pointer to the instance to be cloned.
        /// \param inCloneInstanceName The name of the clone.
        /// \details Clone an instance and its configuration. This function does not clone the 
        ///     instance pins. Instance pins are handled when cloning nets, in function cloneNet.
        InstanceSharedPtr cloneInstance(InstanceSharedPtr inIntancePtr,
            const string& inCloneInstanceName) {

            // Clone inInstancePtr
            InstanceSharedPtr inInstanceClonePtr = Factory::newInstancePtr(inCloneInstanceName,
                inIntancePtr->getType(), inIntancePtr->getTile(), inIntancePtr->getSite(),
                inIntancePtr->getBonding());

            // Begin clone inIntance configuration
            // Get a begin iterator to inIntance config
            ConfigMap::const_iterator instanceConfigBegin = inIntancePtr->configBegin();
            // Get an end iterator to inIntance config
            ConfigMap::const_iterator instanceConfigEnd = inIntancePtr->configEnd();
            // Configuration map
            ConfigMap configMap;

            // Iterate over all configuration
            while(instanceConfigBegin != instanceConfigEnd) {

                // Get current setting
                const string setting = instanceConfigBegin->first;
                // Get current configuration
                const Config config = instanceConfigBegin->second;
                // Add (setting,configuration) to configuration map
                configMap.setConfig(setting, config);
                // Move to the next configuration
                instanceConfigBegin++;

            }

            // Add configurations to instance clone
            inInstanceClonePtr->addConfigs(configMap);
            // End clone inInstance configuration

            // Return cloned instance
            return inInstanceClonePtr;
        }

        /// \brief Clone a net.
        /// \param inNetPtr A pointer to the net to be cloned.
        /// \param inNetCloneName The name of the clone.
        /// \param inModuleInstanceName The module instance name.
        /// \details Clone a net, its configuration, its sources, sinks and pips. For pips, the
        ///     routethrough instances are droppped and not cloned.
        NetSharedPtr cloneNet(NetSharedPtr inNetPtr, const string& inNetCloneName,
            const string& inModuleInstanceName) {

            // Clone inNetPtr
            NetSharedPtr inNetClonePtr = Factory::newNetPtr(inNetCloneName, inNetPtr->getNetType());

            // Begin clone inNetPtr configuration
            // Get a begin iterator to net config
            ConfigMap::const_iterator netConfigBegin = inNetPtr->configBegin();
            // Get an end iterator to net config
            ConfigMap::const_iterator netConfigEnd = inNetPtr->configEnd();
            // Configuration map
            ConfigMap configMap;

            // Iterate over all configuration
            while(netConfigBegin != netConfigEnd) {

                // Get current setting
                const string setting = netConfigBegin->first;
                // Get current configuration
                const Config config = netConfigBegin->second;
                // Add (setting,configuration) to configuration map
                configMap.setConfig(setting, config);
                // Move to the next configuration
                netConfigBegin++;

            }

            // Add configurations to net clone
            inNetClonePtr->addConfigs(configMap);
            // End clone inNetPtr configuration

            // Begin clone inNetPtr sources
            // Get a begin iterator to net sources
            InstancePinSharedPtrConstIterator inNetSourcesBegin = inNetPtr->sourcesBegin();
            // Get an end iterator to net sources
            InstancePinSharedPtrConstIterator inNetSourcesEnd = inNetPtr->sourcesEnd();

            // Iterate over all source pins
            while(inNetSourcesBegin != inNetSourcesEnd) {

                // Get pointer to current net pin
                InstancePinSharedPtr instPinPtr = *inNetSourcesBegin;
                // Get net pin reference instance
                InstanceSharedPtr pinInstPtr = instPinPtr->getInstancePtr().lock();
                // Find the cloned instance that correspond to the pin reference instance
                InstanceSharedPtrIterator pinInstPtrCloneItr = mDesignPtr->findInstance(
                    inModuleInstanceName + sHierarchySeparator + pinInstPtr->getName());
                // Clone source pin
                InstancePinSharedPtr instPinPtrClone 
                    = Factory::newInstancePinPtr(*pinInstPtrCloneItr, instPinPtr->getPinName());
                // Add pin clone to the net clone
                inNetClonePtr->addSource(instPinPtrClone);
                // Move to next source
                inNetSourcesBegin++;

            }
            // End clone inNetPtr sources

            // Begin clone inNetPtr sinks
            // Get a begin iterator to net sinks
            InstancePinSharedPtrConstIterator inNetSinksBegin = inNetPtr->sinksBegin();
            // Get an end iterator to net sinks
            InstancePinSharedPtrConstIterator inNetSinksEnd = inNetPtr->sinksEnd();

            // Iterate over all sink pins
            while(inNetSinksBegin != inNetSinksEnd) {

                // Get pointer to current net pin
                InstancePinSharedPtr instPinPtr = *inNetSinksBegin;
                // Get net pin reference instance
                InstanceSharedPtr pinInstPtr = instPinPtr->getInstancePtr().lock();
                // Find the cloned instance that correspond to the pin reference instance
                InstanceSharedPtrIterator pinInstPtrCloneItr = mDesignPtr->findInstance(
                    inModuleInstanceName + sHierarchySeparator + pinInstPtr->getName());
                // Clone sink pin
                InstancePinSharedPtr instPinPtrClone 
                    = Factory::newInstancePinPtr(*pinInstPtrCloneItr, instPinPtr->getPinName());
                // Add pin clone to the net clone
                inNetClonePtr->addSink(instPinPtrClone);
                // Move to next sink
                inNetSinksBegin++;

            }
            // End clone inNetPtr sinks

            // Begin clone inNetPtr pips
            // Get a begin iterator to net pips
            PipConstIterator inNetPipsBegin = inNetPtr->pipsBegin();
            // Get an end iterator to net pips
            PipConstIterator inNetPipsEnd = inNetPtr->pipsEnd();

            // Iterate over all pips
            while(inNetPipsBegin != inNetPipsEnd) {

                // Get a pointer to the current pip
                Pip pipPtr = *inNetPipsBegin;
                /// \todo We are dropping routethrough instances.
                // Clone the pip
                Pip pipClone = Factory::newPip(pipPtr.getTileName(), pipPtr.getSourceWireName(),
                    pipPtr.getSinkWireName(), pipPtr.getDirection());
                // Add pip clone to cloned net
                inNetClonePtr->addPip(pipClone);
                // Move to next pip
                inNetPipsBegin++;

            }
            // End clone inNetPtr pips

            // Return cloned net
            return inNetClonePtr;
        }
    };

} // namespace physical
} // namespace torc

#endif // TORC_PHYSICAL_MODULETRANSFORMER_HPP

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