gem5/ext/systemc/src/sysc/kernel/sc_phase_callback_registry.cpp

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/*****************************************************************************

  sc_phase_callback_registry.cpp -- Implementation of phase callback registry

  Original Author: Philipp A. Hartmann, OFFIS, 2013-02-15

  CHANGE LOG AT END OF FILE
 *****************************************************************************/

#include "sysc/kernel/sc_object.h"
#include "sysc/kernel/sc_phase_callback_registry.h"
#include "sysc/kernel/sc_kernel_ids.h"
#include "sysc/utils/sc_report.h"

#include <algorithm>
#include <functional>

namespace sc_core {

#if SC_HAS_PHASE_CALLBACKS_

sc_phase_callback_registry::sc_phase_callback_registry( sc_simcontext& simc )
  : m_simc( &simc )
#if 0
  , m_cb_eval_vec()
#endif
  , m_cb_update_vec()
  , m_cb_timestep_vec()
{}

sc_phase_callback_registry::~sc_phase_callback_registry()
{}

static const sc_phase_callback_registry::mask_type
  SC_PHASE_CALLBACK_MASK = SC_STATUS_ANY;

namespace /* anonymous */ {

struct entry_match
  : std::unary_function< sc_phase_callback_registry::entry, bool >
{
    typedef sc_phase_callback_registry::cb_type* ref_type;

    explicit
    entry_match( ref_type ref )
      : ref_(ref)
    {}

    result_type operator()( argument_type e )
        { return e.target == ref_; }
private:
    sc_phase_callback_registry::cb_type * ref_;

}; // entry_match

template< typename T >
inline void
erase_remove( std::vector<T>* vec, T const& t )
{
    vec->erase( std::remove( vec->begin(), vec->end(), t ) );
}

}  // namespace anonymous


sc_phase_callback_registry::mask_type
sc_phase_callback_registry::validate_mask( cb_type& cb
                                         , mask_type m
                                         , bool warn = false )
{
    if( SC_UNLIKELY_(m & ~SC_PHASE_CALLBACK_MASK) )
    {
        if( warn )
        {
            std::stringstream ss;
            ss << cb.name() << ": invalid phase callback mask: "
               << (sc_status)m;
            SC_REPORT_WARNING( SC_ID_PHASE_CALLBACK_REGISTER_
                             , ss.str().c_str() );
        }
        m &= SC_PHASE_CALLBACK_MASK;
    }

    mask_type check_mask;

    // elaboration callbacks
    check_mask = ( SC_ELABORATION
                 | SC_BEFORE_END_OF_ELABORATION
                 | SC_END_OF_ELABORATION );
    if( SC_UNLIKELY_( (m & check_mask ) && m_simc->elaboration_done() ) )
    {
        if( warn )
        {
            std::stringstream ss;
            ss << cb.name() << ": elaboration done\n\t "
               << (sc_status)( m & check_mask ) << " callback(s) ignored";
            SC_REPORT_WARNING(SC_ID_PHASE_CALLBACK_REGISTER_
                             , ss.str().c_str() );
        }
        m &= ~check_mask;
    }

    check_mask = (SC_BEFORE_END_OF_ELABORATION | SC_END_OF_ELABORATION);
    if( SC_UNLIKELY_(m & SC_ELABORATION) )
    {
        if( warn )
        {
            std::stringstream ss;
            ss << cb.name() << ": " << SC_ELABORATION
               << ":\n\t substituted by " << (sc_status)(check_mask);
            SC_REPORT_WARNING( SC_ID_PHASE_CALLBACK_REGISTER_
                             , ss.str().c_str() );
        }
        m &= ~SC_ELABORATION;
        m |= check_mask;
    }

    check_mask = ( SC_END_OF_INITIALIZATION
#if 0
                 | SC_END_OF_EVALUATION
#endif
                 | SC_END_OF_UPDATE
                 | SC_BEFORE_TIMESTEP );
    if( SC_UNLIKELY_(m & SC_RUNNING) )
    {
        if( warn )
        {
            std::stringstream ss;
            ss << cb.name() << ": " << SC_RUNNING
               << ":\n\t substituted by " << (sc_status)(check_mask);
            SC_REPORT_WARNING( SC_ID_PHASE_CALLBACK_REGISTER_
                             , ss.str().c_str() );
        }
        m &= ~SC_RUNNING;
        m |= check_mask;
    }
    return m;
}


sc_phase_callback_registry::mask_type
sc_phase_callback_registry::register_callback( cb_type& cb, mask_type m )
{
    storage_type::iterator it =
      find_if( m_cb_vec.begin(), m_cb_vec.end(), entry_match(&cb) );

    m = validate_mask(cb, m, /* warn */ true );

    mask_type diff_mask = m;
    mask_type new_mask  = m;

    if( it != m_cb_vec.end() ) // update existing entry
    {
        // update masks
        new_mask   =  (*it).mask | m;
        diff_mask  = ~(*it).mask & m;
        (*it).mask = new_mask;
    }
    else // new entry
    {
        if( !m ) // empty, do nothing
            return SC_UNITIALIZED;

        entry new_entry = { &cb, new_mask };
        m_cb_vec.push_back( new_entry );
    }

    // add to callback shortcut sets
#if 0
    if( diff_mask & SC_END_OF_EVALUATION )
        m_cb_eval_vec.push_back( &cb );
#endif
    if( diff_mask & SC_END_OF_UPDATE )
        m_cb_update_vec.push_back( &cb );
    if( diff_mask & SC_BEFORE_TIMESTEP )
        m_cb_timestep_vec.push_back( &cb );

    return new_mask;
}


sc_phase_callback_registry::mask_type
sc_phase_callback_registry::unregister_callback( cb_type& cb, mask_type m )
{
    storage_type::iterator it =
      find_if( m_cb_vec.begin(), m_cb_vec.end(), entry_match(&cb) );

    m = validate_mask(cb, m);

    mask_type diff_mask = m;
    mask_type new_mask  = m;

    if( it == m_cb_vec.end() ) { // not registered
        return SC_UNITIALIZED;
    }

    // update masks
    new_mask   = (*it).mask & ~m;
    diff_mask  = (*it).mask & m;
    (*it).mask = new_mask;

    if( !new_mask )
        m_cb_vec.erase(it);

    // drop from callback shortcut sets
#if 0
    if( diff_mask & SC_END_OF_EVALUATION )
        erase_remove( &m_cb_eval_vec, &cb );
#endif
    if( diff_mask & SC_END_OF_UPDATE )
        erase_remove( &m_cb_update_vec, &cb );
    if( diff_mask & SC_BEFORE_TIMESTEP )
        erase_remove( &m_cb_timestep_vec, &cb );

    return new_mask;
}


// generic implementation (for non-critical callbacks)
//  - also restores hierarchy around callback object
void
sc_phase_callback_registry::do_callback( sc_status s ) const
{
    typedef storage_type::const_iterator it_type;
    storage_type const & vec = m_cb_vec;

    for(it_type it = vec.begin(), end = vec.end(); it != end; ++it) {
        if( s & it->mask ) {
            sc_object::hierarchy_scope scope(it->target);
            it->target->do_simulation_phase_callback();
        }
    }
}

#else // ! SC_HAS_PHASE_CALLBACKS_

sc_phase_callback_registry::sc_phase_callback_registry( sc_simcontext& ){}
sc_phase_callback_registry::~sc_phase_callback_registry(){}

static inline void
warn_phase_callbacks( sc_core::sc_object const& obj )
{
    static bool warned = false;
    if (!warned)
    {
        std::stringstream ss;
        ss << obj.name() << ".\n"
           << "Please recompile SystemC with "
              "\"SC_ENABLE_SIMULATION_PHASE_CALLBACKS\" defined.";
        SC_REPORT_WARNING( SC_ID_PHASE_CALLBACKS_UNSUPPORTED_
                         , ss.str().c_str() );
    }
}

sc_phase_callback_registry::mask_type
sc_phase_callback_registry::register_callback( cb_type& cb, mask_type )
{
    warn_phase_callbacks( cb );
    return SC_UNITIALIZED;
}

sc_phase_callback_registry::mask_type
sc_phase_callback_registry::unregister_callback( cb_type& cb, mask_type )
{
    warn_phase_callbacks( cb );
    return SC_UNITIALIZED;
}

#endif // ! SC_HAS_PHASE_CALLBACKS_

} // namespace sc_core

/*****************************************************************************

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  changes you are making here.

      Name, Affiliation, Date:
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 *****************************************************************************/
// Taf!