sdc-plugin/propagation.h

/*
 *  yosys -- Yosys Open SYnthesis Suite
 *
 *  Copyright (C) 2020  The Symbiflow Authors
 *
 *  Permission to use, copy, modify, and/or distribute this software for any
 *  purpose with or without fee is hereby granted, provided that the above
 *  copyright notice and this permission notice appear in all copies.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
#ifndef _PROPAGATION_H_
#define _PROPAGATION_H_

#include "clocks.h"

USING_YOSYS_NAMESPACE

class Propagation
{
  public:
    Propagation(RTLIL::Design *design, Pass *pass) : design_(design), pass_(pass) {}
    virtual ~Propagation() {}

    virtual void Run() = 0;

  protected:
    RTLIL::Design *design_;
    Pass *pass_;

    // This propagation doesn't change the clock so the sink wire is only marked
    // as propagated clock signal, but has the properties of the driving clock
    void PropagateThroughBuffers(Buffer buffer);
    std::vector<RTLIL::Wire *> FindSinkWiresForCellType(RTLIL::Wire *driver_wire, const std::string &cell_type, const std::string &cell_port);
    RTLIL::Cell *FindSinkCellOfType(RTLIL::Wire *wire, const std::string &type);
    RTLIL::Cell *FindSinkCellOnPort(RTLIL::Wire *wire, const std::string &port);
    RTLIL::Wire *FindSinkWireOnPort(RTLIL::Cell *cell, const std::string &port_name);
    bool WireHasSinkCell(RTLIL::Wire *wire);
};

class NaturalPropagation : public Propagation
{
  public:
    NaturalPropagation(RTLIL::Design *design, Pass *pass) : Propagation(design, pass) {}

    void Run() override;
    std::vector<RTLIL::Wire *> FindAliasWires(RTLIL::Wire *wire);
};

class BufferPropagation : public Propagation
{
  public:
    BufferPropagation(RTLIL::Design *design, Pass *pass) : Propagation(design, pass) {}

    void Run() override;
};

class ClockDividerPropagation : public Propagation
{
  public:
    ClockDividerPropagation(RTLIL::Design *design, Pass *pass) : Propagation(design, pass) {}

    void Run() override;
    void PropagateClocksForCellType(RTLIL::Wire *driver_wire, const std::string &cell_type);
    void PropagateThroughClockDividers(ClockDivider divider);
};
#endif // PROPAGATION_H_