98 lines
5.3 KiB
C++
98 lines
5.3 KiB
C++
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// -*- C++ -*-
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namespace Kite {
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/*! \mainpage Detailed Router Documentation
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*
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* This documentation adresses two level of explanations :
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*
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* <ul>
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* <li>The \b API description which explains how to use Kite,
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* thoses parts as flagged as \b API.
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* <li>The internal description which details how Kite do
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* things. It's mostly intended for myself to help me not to
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* forget how I've done things when debug time will come...
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* It may also be valuable to people who may want to use
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* or patch Kite for their own purpose (my secret hope).
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* </ul>
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*
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*
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* \defgroup AlgorithmOverview Algorithm Overview (internal)
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*
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* The algorithm top-level is implemented in the \c NegociateWindow.
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*
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* <b>First step :</b> NegociateWindow::_loadRouting()
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* <ol>
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* <li>Load routing wires (\c AutoSegment) from \c KatabaticEngine
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* inside the Kite \c GCell's. Then update the \c GCell's density.
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* <li>Sort the \c GCell's according to decreasing density (denser
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* \c GCell's are to be routed first).
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* <li>Agglomerate clusters of contiguous GCell's whose density
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* is superior to 0.7 to the seed GCell. See \c GCellRoutingSet
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* for the mechanism.
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*
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* GCellRoutingSet receive an increasing order number. The higher
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* the order the lower the density. This order is transmitted
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* to the \c TrackSegment of the \c GCellRoutingSet to be taken into
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* account by the track cost function.
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* </ol>
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*
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* <b>Second step :</b> \c NegociateWindow::_runOnGCellRoutingSet()
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*
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* For each \c GCellRoutingSet in decreasing density, negociate the
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* set of associated \c TrackSegment.
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* <ol>
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* <li>Build a \c RoutingEventQueue from the list of \c TrackSegment.
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* The queue is responsible for allocating the \c RoutingEvent
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* associated to each \c TrackSegment.
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* <li>The queue is sorted according to the "event level" then
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* to the priority, which is for now the slack of the \c TrackSegment.
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* That is, constrained \c TrackSegment are routed first.
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* <li>The queue is processed till it's empty (no unprocessed \c RoutingEvent
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* remains).
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*
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* Processing a \c RoutingEvent is trying to insert a \c TrackSegment in
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* a suitable Track. We proceed as follow :
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* <ul>
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* <li>The maximum ripup count for the to be inserted segment has
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* been reached. Issue a severe warning and left unrouted
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* this \c TrackSegment (for now).
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* <li>Compute the Tracks in which the \c TrackSegment can be inserted,
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* then compute the insertion cost in each one. The candidates
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* are ordered by the insertion cost.
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* <li>Now consider the lower cost \c Track. If there is a free interval
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* for the \c TrackSegment. Issue a \c Session::addInsertEvent() then
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* finish.
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*
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* If there is a <i>"soft overlap"</i>, that is the overlaping
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* \c TrackSegment already in the \c Track could be shrunk either to
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* the left or the right so the new \c TrackSegment can be inserted.
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* This is managed by \c RoutingEvent::_setAside(), for each soft
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* overlaping \c TrackSegment, gets its perpandiculars and issue
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* a displacement request for all of them. That is, re-post a
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* \c RoutingEvent with updated constraints and remove the
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* perpandicular from it's Track if it has already been routed.
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* Note that no request is issued for the overlaping \c TrackSegment
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* itself has it do not change of Track.
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*
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* If there is a <i>"hard overlap"</i>, that is the two \c TrackSegment
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* cannot share the same \c Track, remove the previous one from
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* the \c Track and re-post a \c RoutingEvent. Note that, the
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* cost object should have selected a \c TrackSegment which could
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* be ripped-up. Otherwise the \c Track would'nt even be a candidate.
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* </ul>
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*
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* When a TrackSegment is riped up, it is re-routed immediately
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* afterward. This is done by increasing his event level.
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* </ol>
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*/
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/*! \namespace Kite
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* \brief The namespace dedicated to Kite.
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*/
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}
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