source: sources/src/sc_port.cc @ 51

/*------------------------------------------------------------\
|                                                             |
| Tool    :                  systemcass                       |
|                                                             |
| File    :                   sc_port.cc                      |
|                                                             |
| Author  :                 Buchmann Richard                  |
|                           Taktak Sami                       |
|                                                             |
| Date    :                   09_07_2004                      |
|                                                             |
\------------------------------------------------------------*/

/* 
 * This file is part of the Disydent Project
 * Copyright (C) Laboratoire LIP6 - Département ASIM
 * Universite Pierre et Marie Curie
 * 
 * Home page          : http://www-asim.lip6.fr/disydent
 * E-mail             : mailto:richard.buchmann@lip6.fr
 * 
 * This library is free software; you  can redistribute it and/or modify it
 * under the terms  of the GNU Library General Public  License as published
 * by the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 * 
 * Disydent is distributed  in the hope  that it  will be
 * useful, but WITHOUT  ANY WARRANTY; without even the  implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
 * Public License for more details.
 * 
 * You should have received a copy  of the GNU General Public License along
 * with the GNU C Library; see the  file COPYING. If not, write to the Free
 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */


#include <iomanip>
#include <map>
#include <cassert>

#include "sc_port.h"
#include "sc_signal.h"
#include "sc_module.h"
#include "entity.h"
#include "global_functions.h"

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

extern "C" {
        extern char unstable;
  char unstable = 0; // not in sc_core namespace because dynamic link support C linkage only
  int32_t pending_write_vector_nb = 0;
}

using namespace std;

namespace sc_core {

const char *const sc_port_base::kind_string = "sc_port";
const char *const sc_signal_base::kind_string = "sc_signal";

unsigned int pending_write_vector_capacity = 512;
pending_write_vector_t pending_write_vector = NULL;
extern equi_list_t equi_list;

const char* get_module_name (const tab_t *pointer)
{
        const equi_t &eq = get_equi (pointer);
  return get_module_name (eq);
}

//typedef std::map<const sc_port_base*, const sc_module*> port2module_t;
port2module_t port2module;

// KIND STRING
const char * const sc_inout_string = "sc_inout";
const char * const sc_in_string    = "sc_in";
const char * const sc_out_string   = "sc_out";

// ----------------------------------------------------------------------------
//  CLASS : sc_port_base
//
//                                               
// ----------------------------------------------------------------------------

sc_port_base::sc_port_base()
{
        init ();
}

sc_port_base::sc_port_base(const char* name_) : sc_object(name_)
{
        init ();
}

sc_port_base::sc_port_base(const sc_port_base& parent_) : sc_object (parent_.name ())
{
        init ();
}

void
sc_port_base::init ()
{
#ifdef CONFIG_DEBUG
        if (modules_stack.empty ()) {
                cerr << "Internal error : modules stack empty\n";
                exit (9);
        }
#endif
        const sc_module *last_module = sc_core::modules_stack.top ();
        port2module[this] = last_module;
        set_kind (kind_string);
}

const sc_module &
sc_port_base::get_module () const
{
        port2module_t::iterator i = port2module.find ((sc_port_base*)this);
        if (i == port2module.end ()) {
                cerr << "Internal error : Modules contain ports. "
            "SystemCASS needs to identify the module that contains the following port : '" 
        << name()
                          << "'\n";
                exit (17);
        }
  const sc_module *m = i->second;
        return *m;
}

static bool check_multiwriting2port_error_message = true;
void
sc_port_base::check_multiwriting2port () const
{
  static std::map<sc_port_base*, double> s;
  double t = sc_simulation_time ();
  if (t == 0)
    return;
  sc_port_base *port = (sc_port_base*)this;
  if ((s[port] == t) && (check_multiwriting2port_error_message))
  {
    check_multiwriting2port_error_message = 0;
    if (use_port_dependency)
    {
      std::cerr << "Error at cycle #" << t << " : "
                   "SystemCASS allows only 1 writing for each ports/signals.\n"
                << "Functions write several times into '" << name () << "'.\n";
    } else {
      std::cerr << "Error : "
                   "Multiwriting to port assertion works only "
                   "when SystemCASS uses port dependency information "
                   "(--p parameter).\n";
    }
    sc_core::sc_stop ();
    exit (31072006); // 6
  } else
    s[port] = t;
}

std::ostream& 
operator << (std::ostream &o, const sc_port_base &p)
{
  return o << p.name ();
}
// ----------------------------------------------------------------------------
//  CLASS : sc_signal_base
//
//  The sc_signal<T> primitive channel class.
// ----------------------------------------------------------------------------

void
sc_signal_base::init ()
{
        set_kind (kind_string);
        bind (*this);
}

sc_signal_base::sc_signal_base() { 
  init ();
}

sc_signal_base::sc_signal_base(const char* name_) : sc_object(name_) { 
  init ();
}

sc_signal_base::sc_signal_base(const char* name_, void*) : sc_object(name_) {
        // this overload is only used for SC_BIND_PROXY_NIL constant.
        // this signal should not be added to the signal list.
}

sc_signal_base::~sc_signal_base() { 
}

/*
 * Signals copy
 */

#ifdef DUMP_SIGNAL_STATS
typedef map<tab_t*,long long int> counter_t;
static counter_t  counter;
long long int unnecessary = 0;
long long int total_assig = 0;
#endif

} // end of sc_core namespace

extern "C" {
void
update ()
{
#if defined(DUMP_STAGE)
  cerr << "Updating... ";
#endif
// stl vectors are too slow
// memcopy is not better
// signal table sorting doesn't give any better performance     
#if 0
        cerr << pending_write_vector_nb << " " << pending_write_vector_capacity << endl;
#endif
#if defined(DUMP_STAGE)
  cerr << "(" << pending_write_vector_nb 
       << " internal pending writings) ";
#endif
        unsigned int i;
        for (i = 0; i < pending_write_vector_nb; ++i) {
#if 0
                cerr << "pending_write[" << i << "] : " << pending_write_vector[i];
#endif
#define iter (sc_core::pending_write_vector[i])
#ifdef CONFIG_DEBUG
                if (iter.pointer == NULL) {
                        cerr << "Internal error : trying to apply a posted write from an unassigned signal/port\n";
                        exit (8);
                }
#endif  
#ifdef DUMP_SIGNAL_STATS
                if (*(iter.pointer) == iter.value)
                        unnecessary++;
                counter[iter.pointer]++;
#endif
                *(iter.pointer) = iter.value;   
#undef iter
  }
#ifdef DUMP_SIGNAL_STATS
        total_assig += pending_write_vector_nb;
#endif
        pending_write_vector_nb = 0;

#if defined(DUMP_STAGE)
  cerr << "done.\n";
#endif
}

} // end of extern "C"

namespace sc_core {

void
print_registers_writing_stats (ostream &o)
{
#ifdef DUMP_SIGNAL_STATS
        o << "signal index / name / usage (>1%)\n";
        o << setprecision (2);
        double t = sc_simulation_time ();
        if (t == 0) {
                o << "Warning : simulation too short.\n";
                t = 0.01;
        }
        if (total_assig == 0)
                return;
        counter_t::iterator k;
        for (k = counter.begin (); k != counter.end (); ++k) {
                double usage = k->second / t * 100;
                if (usage <= 1)
                        continue;
                o << k->first 
                        << "   " << get_name (k->first) 
                        << "   " << usage << "%\n";
        }
        typedef map<string,int> counter_module_t;
        counter_module_t counter_by_module;
        for (k = counter.begin (); k != counter.end (); ++k) {
                string module_name = get_module_name (k->first);
                counter_by_module[module_name] += k->second;    
        }
        o << "module name / usage\n";
        counter_module_t::iterator i;
        for (i = counter_by_module.begin (); i != counter_by_module.end (); ++i) {
                o << i->first 
                        << "   " << (i->second * 100 / total_assig) << "%\n";
        }
        cerr << "average of assignment number per cycle " << (total_assig / t) << "\n";
        cerr << (unnecessary * 100 / total_assig) << "% of assignment are unecessary\n";
#else
        cerr << "Register usage not available.\n";
#endif
}

static
bool
is_bound (/*const*/ sc_port_base &port)
{
  const tab_t *pointer = port.get_pointer ();
  //assert(pointer != NULL);
  if (pointer == NULL)
    return false; // case : sc_in not bound
/*
  equi_t &e = get_equi (pointer);
  if (e.size () == 1)
    return true; // case : sc_out not bound
*/
  return has_equi (port);
}

static
void
check_port (/*const*/ sc_port_base &port)
{
  if (!is_bound (port))
  {
    cerr << "Error : '" << port.name () << "' port"
            " (" << port.kind() << ")"
            " is not bound.\n";
    exit (29);
  }
}

void
check_all_ports ()
{
  if (dump_stage)
    cerr << "checking ports...";
        port2module_t::/*const_*/iterator i;
  for (i = port2module.begin (); i != port2module.end (); ++i)
  {
    /*const*/ sc_port_base *port = i->first;
    assert(port != NULL);
    check_port (*port);
  }
  if (dump_stage)
    cerr << " done.";
}

} // end of sc_core namespace