peq_with_cb_and_phase.h

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#ifndef __SYSTEMC_EXT_TLM_UTILS_PEQ_WITH_CB_AND_PHASE_H__
#define __SYSTEMC_EXT_TLM_UTILS_PEQ_WITH_CB_AND_PHASE_H__

#include <vector>

#include "../core/sc_main.hh"
#include "../core/sc_object.hh"
#include "../core/sc_spawn.hh"
#include "../core/sc_time.hh"
#include "../dt/int/sc_nbdefs.hh"
#include "../tlm_core/2/interfaces/fw_bw_ifs.hh"

namespace tlm_utils
{

template <typename PAYLOAD>
class time_ordered_list
{
  public:
    struct element
    {
        struct element *next;
        PAYLOAD p;
        sc_core::sc_time t;
        sc_dt::uint64 d;
        element(PAYLOAD &p, sc_core::sc_time t, sc_dt::uint64 d) :
            p(p), t(t), d(d)
        {}
        element() {}
    };

    element *nill;
    element *empties;
    element *list;
    unsigned int size;

    time_ordered_list() : nill(new element()), empties(NULL),
                          list(nill), size(0)
    {}

    ~time_ordered_list()
    {
        reset();
        while (empties) {
            struct element *e = empties->next;
            delete empties;
            empties = e;
        }
        delete nill;
    }

    void
    reset()
    {
        while (size) {
            delete_top();
        }
    }

    void
    insert(const PAYLOAD &p, sc_core::sc_time t)
    {
        if (!empties) {
            empties = new struct element();
            empties->next=NULL;
        }

        struct element *e = empties;
        empties = empties->next;
        e->p = p;
        e->t = t;
        e->d = sc_core::sc_delta_count();

        struct element *ancestor = nill;
        struct element *iterator = list;
        while (iterator != nill && iterator->t <= t) {
            ancestor = iterator;
            iterator = iterator->next;
        }
        if (ancestor == nill) {
            e->next = list;
            list = e;
        } else {
            e->next = iterator;
            ancestor->next = e;
        }
        size++;
    }

    void
    delete_top()
    {
        if (list != nill) {
            struct element *e = list;
            list = list->next;
            e->next = empties;
            empties = e;
            size--;
        }
    }

    unsigned int get_size() { return size; }
    PAYLOAD &top() { return list->p; }
    sc_core::sc_time top_time() { return list->t; }
    sc_dt::uint64 &top_delta() { return list->d; }
    sc_core::sc_time next_time() { return list->next->t; }
};

//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
template<typename OWNER, typename TYPES=tlm::tlm_base_protocol_types>
class peq_with_cb_and_phase : public sc_core::sc_object
{
    typedef typename TYPES::tlm_payload_type tlm_payload_type;
    typedef typename TYPES::tlm_phase_type tlm_phase_type;
    typedef std::pair<tlm_payload_type *, tlm_phase_type> PAYLOAD;
    typedef void (OWNER::*cb)(tlm_payload_type &, const tlm_phase_type &);

    class delta_list
    {
      public:
        delta_list()
        {
            reset();
            entries.resize(100);
        }

        inline void
        insert(const PAYLOAD &p)
        {
            if (size==entries.size()) {
                entries.resize(entries.size() * 2);
            }
            entries[size++] = p;
        }

        inline PAYLOAD &get() { return entries[out++]; }
        inline bool next() { return out < size; }
        inline void
        reset()
        {
            size=0;
            out=0;
        }

      public:
        unsigned int size;

      private:
        std::vector<PAYLOAD> entries;
        unsigned int out;
    };

  public:
    peq_with_cb_and_phase(OWNER *_owner, cb _cb) :
        sc_core::sc_object(sc_core::sc_gen_unique_name(
                    "peq_with_cb_and_phase")),
        m_owner(_owner), m_cb(_cb)
    {
        sc_core::sc_spawn_options opts;
        opts.spawn_method();
        opts.set_sensitivity(&m_e);
        opts.dont_initialize();
        sc_core::sc_spawn(sc_bind(&peq_with_cb_and_phase::fec, this),
                          sc_core::sc_gen_unique_name("fec"), &opts);
    }

    peq_with_cb_and_phase(const char *_name, OWNER *_owner, cb _cb) :
        sc_core::sc_object(_name), m_owner(_owner), m_cb(_cb)
    {
        sc_core::sc_spawn_options opts;
        opts.spawn_method();
        opts.set_sensitivity(&m_e);
        opts.dont_initialize();
        sc_core::sc_spawn(sc_bind(&peq_with_cb_and_phase::fec, this),
                          sc_core::sc_gen_unique_name("fec"), &opts);
    }

    ~peq_with_cb_and_phase() {}

    void
    notify(tlm_payload_type &t, const tlm_phase_type &p,
            const sc_core::sc_time &when)
    {
        if (when == sc_core::SC_ZERO_TIME) {
            if (sc_core::sc_delta_count() & (sc_dt::uint64)0x1) {
                // Uneven delta cycle so delta delay is for even cycle.
                m_even_delta.insert(PAYLOAD(&t,p));
            } else {
                // Even delta cycle so delta delay is for uneven delta.
                m_uneven_delta.insert(PAYLOAD(&t, p));
            }
            m_e.notify(sc_core::SC_ZERO_TIME);
        } else {
            m_ppq.insert(PAYLOAD(&t, p), when + sc_core::sc_time_stamp());
            // Note, this will only overwrite the "newest" event.
            m_e.notify(when);
        }
    }

    void
    notify(tlm_payload_type &t, const tlm_phase_type &p)
    {
        m_immediate_yield.insert(PAYLOAD(&t, p));
        m_e.notify(); // Immediate notification.
    }

    // Cancel all events from the event queue.
    void
    cancel_all()
    {
        m_ppq.reset();
        m_uneven_delta.reset();
        m_even_delta.reset();
        m_immediate_yield.reset();
        m_e.cancel();
    }

  private:
    void
    fec()
    {
        // Immediate yield notifications.
        while (m_immediate_yield.next()) {
            PAYLOAD &tmp = m_immediate_yield.get();
            (m_owner->*m_cb)(*tmp.first, tmp.second);
        }
        m_immediate_yield.reset();

        // Delta notifications.
        if (sc_core::sc_delta_count() & (sc_dt::uint64)0x1) {
            // Uneven delta so put out all payloads for uneven delta.
            while (m_uneven_delta.next()) {
                PAYLOAD &tmp = m_uneven_delta.get();
                (m_owner->*m_cb)(*tmp.first, tmp.second);
            }
            m_uneven_delta.reset();
            if (m_even_delta.size)
                m_e.notify(sc_core::SC_ZERO_TIME);
        } else {
            while (m_even_delta.next()) {
                PAYLOAD &tmp = m_even_delta.get();
                (m_owner->*m_cb)(*tmp.first, tmp.second);
            }
            m_even_delta.reset();
            if (m_uneven_delta.size)
                m_e.notify(sc_core::SC_ZERO_TIME);
        }
        if (!m_ppq.get_size())
            return; // There were only delta notification.

        // Timed notifications.
        const sc_core::sc_time now = sc_core::sc_time_stamp();
        sc_core::sc_time top = m_ppq.top_time();

        while (m_ppq.get_size() && top == now) {
            // Push all active ones into target.
            PAYLOAD &tmp = m_ppq.top();
            (m_owner->*m_cb)(*tmp.first, tmp.second);
            m_ppq.delete_top();
            top = m_ppq.top_time();
        }
        if (m_ppq.get_size()) {
            m_e.notify(top - now);
        }
    }

    OWNER *m_owner;
    cb m_cb;

    time_ordered_list<PAYLOAD> m_ppq;
    delta_list m_uneven_delta;
    delta_list m_even_delta;
    delta_list m_immediate_yield;

    sc_core::sc_event m_e; // Default event.
};

} // namespace tlm_utils

#endif /* __SYSTEMC_EXT_TLM_UTILS_PEQ_WITH_CB_AND_PHASE_H__ */