wait_to_be_seated.cpp

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#include "gui/graph_widget/layouters/wait_to_be_seated.h"
 
#include "gui/gui_globals.h"
#include "hal_core/netlist/endpoint.h"
#include "hal_core/netlist/netlist.h"
#include "hal_core/utilities/utils.h"
 
#include <QDebug>
#include <QMap>
#include <QTextStream>
 
namespace hal
{
    WaitToBeSeatedEntry::WaitToBeSeatedEntry(Node::NodeType t, u32 id)
    {
        mNode = Node(id, t);
    }
 
    void WaitToBeSeatedEntry::setPredecessorIds(const QMap<u32, WaitToBeSeatedEntry*>& gateMap)
    {
        if (getId() <= 0)
            return;
 
        std::vector<Net*> inputNets;
        if (isModule())
        {
            const Module* m = gNetlist->get_module_by_id(getId());
            if (m)
            {
                inputNets = utils::to_vector(m->get_input_nets());
            }
        }
        else
        {
            const Gate* g = gNetlist->get_gate_by_id(getId());
            if (g)
                inputNets = g->get_fan_in_nets();
        }
 
        for (Net* n : inputNets)
        {
            for (const Endpoint* ep : n->get_sources())
            {
                Gate* inpGate = ep->get_gate();
                if (inpGate->is_gnd_gate() || inpGate->is_vcc_gate())
                    break;
                u32 inpGateId                 = inpGate->get_id();
                WaitToBeSeatedEntry* inpEntry = gateMap.value(inpGateId);
                if (inpEntry)
                    mPredecessorSet.insert(inpEntry);
            }
        }
    }
 
    QString WaitToBeSeatedEntry::tagName() const
    {
        return QString("%1%2").arg(isModule() ? 'M' : 'G').arg(getId());
    }
 
    bool WaitToBeSeatedEntry::isModule() const
    {
        return mNode.isModule() && mNode.id() > 0;
    }
 
    //---------------------------------------------------
    bool compareWaitToBeSeated(const WaitToBeSeatedEntry* a, const WaitToBeSeatedEntry* b)
    {
        return a->getId() < b->getId();
    }
 
    double WaitToBeSeatedEntry::distance(const QPoint& pos, double defaultDistance) const
    {
        double retval = 0;
        int n         = mPredecessorSet.size();
        Q_ASSERT(n > 0);
 
        // distance to predecessors already placed
        for (const QPoint& source : mPredecessorPositions)
            retval += distance(source, pos);
 
        // predecessors not placed yet
        retval += (n - mPredecessorPositions.size()) * defaultDistance * 4;
 
        // average
        retval /= n;
 
        // to break a tie : add module/gate id
        retval += getId() / 1000000.;
        return retval;
    }
 
    int WaitToBeSeatedEntry::distance(const QPoint& source, const QPoint& pos)
    {
        int dx = abs(source.x() + 1 - pos.x());
        int dy = abs(source.y() - pos.y()) - 1;
        if (dy < 0)
        {
            // immediate neighbour
            if (!dx)
                return 1;
            dy = 0;
        }
        return 5 + 4 * (dx + dy);
    }
 
    //---------------------------------------------------
    WaitToBeSeatedList::WaitToBeSeatedList() : mPlacementRound(0), mSideLength(0)
    {
        ;
    }
 
    WaitToBeSeatedList::~WaitToBeSeatedList()
    {
        for (WaitToBeSeatedEntry* wtse : *this)
            delete wtse;
    }
 
    void WaitToBeSeatedList::setLinks()
    {
        for (WaitToBeSeatedEntry* wtse : *this)
            wtse->setPredecessorIds(mGateMap);
 
        for (WaitToBeSeatedEntry* wtse : *this)
            for (WaitToBeSeatedEntry* wtsePred : wtse->mPredecessorSet)
                if (wtsePred)
                    wtsePred->mSuccessorSet.insert(wtse);
 
        for (WaitToBeSeatedEntry* wtse : *this)
            if (wtse->mPredecessorSet.isEmpty())
            {
                if (wtse->mSuccessorSet.isEmpty())
                    mIsolated.append(wtse);
                else
                    mStartpoint.append(wtse);
            }
 
        if (mIsolated.size() > 1)
            std::sort(mIsolated.begin(), mIsolated.end(), compareWaitToBeSeated);
 
        if (mStartpoint.size() > 1)
            std::sort(mStartpoint.begin(), mStartpoint.end(), compareWaitToBeSeated);
 
        mSideLength = sqrt(size());
    }
 
    void WaitToBeSeatedList::add(WaitToBeSeatedEntry* wtse)
    {
        Q_ASSERT(wtse);
        append(wtse);
        if (wtse->isModule())
        {
            const Module* m = gNetlist->get_module_by_id(wtse->getId());
            if (m)
            {
                for (const Gate* g : m->get_gates(nullptr, true))
                    if (g)
                        mGateMap.insert(g->get_id(), wtse);
            }
        }
        else
            mGateMap.insert(wtse->getId(), wtse);
    }
 
    const WaitToBeSeatedEntry* WaitToBeSeatedList::nextPlacement(const QPoint& pos)
    {
        bool isEdge = pos.x() == 0 || pos.y() == 0;
        if (!mIsolated.isEmpty() && (isEdge || mWaiting.isEmpty()))
        {
            return doPlacement(pos, mIsolated.takeFirst());
        }
        if (!mStartpoint.isEmpty() && (isEdge || mWaiting.isEmpty()))
        {
            return doPlacement(pos, mStartpoint.takeFirst());
        }
 
        if (mWaiting.isEmpty() && !placementDone())
        {
            for (WaitToBeSeatedEntry* wtse : *this)
                if (!mPlaced.contains(wtse))
                {
                    mWaiting.insert(wtse, mPlacementRound);
                    break;
                }
        }
 
        if (!mWaiting.isEmpty())
        {
            double minDistance                           = 0;
            QMap<WaitToBeSeatedEntry*, int>::iterator jt = mWaiting.end();
            for (QMap<WaitToBeSeatedEntry*, int>::iterator it = mWaiting.begin(); it != mWaiting.end(); ++it)
            {
                double distance = it.key()->distance(pos, mSideLength) - 0.5 * (mPlacementRound - it.value());
                if (jt == mWaiting.end() || distance < minDistance)
                {
                    minDistance = distance;
                    jt          = it;
                }
            }
            Q_ASSERT(jt != mWaiting.end());
            WaitToBeSeatedEntry* closest = jt.key();
            mWaiting.erase(jt);
            return doPlacement(pos, closest);
        }
 
        return nullptr;
    }
 
    const WaitToBeSeatedEntry* WaitToBeSeatedList::doPlacement(const QPoint& pos, WaitToBeSeatedEntry* wtse)
    {
        assert(!mPlaced.contains(wtse));
        ++mPlacementRound;
        mPlaced.insert(wtse);
        for (WaitToBeSeatedEntry* wtseSucc : wtse->mSuccessorSet)
        {
            wtseSucc->mPredecessorPositions.append(pos);
            if (!mWaiting.contains(wtseSucc) && !mPlaced.contains(wtseSucc))
                mWaiting.insert(wtseSucc, mPlacementRound);
        }
        return wtse;
    }
 
    void WaitToBeSeatedList::dump() const
    {
        QTextStream xout(stdout, QIODevice::WriteOnly);
        xout << "WaitToBeSeatedList\n";
        for (WaitToBeSeatedEntry* wtse : *this)
        {
            xout.setFieldWidth(4);
            xout << wtse->getId();
            xout << (wtse->isModule() ? "MOD" : "GAT");
            xout << "<<<";
            for (WaitToBeSeatedEntry* wtsePred : wtse->mPredecessorSet)
            {
                xout << wtsePred->tagName();
            }
            xout << ">>>";
            for (WaitToBeSeatedEntry* wtseSucc : wtse->mSuccessorSet)
            {
                xout << wtseSucc->tagName();
            }
            xout.setFieldWidth(0);
            xout << "\n";
        }
        xout << "------------------------\n";
    }
 
}    // namespace hal