Implement $feof() from 1364-2005.

[iverilog.git] / net_design.cc

/*
 * Copyright (c) 2000-2003 Stephen Williams (steve@icarus.com)
 *
 *    This source code is free software; you can redistribute it
 *    and/or modify it in source code form under the terms of the GNU
 *    General Public License as published by the Free Software
 *    Foundation; either version 2 of the License, or (at your option)
 *    any later version.
 *
 *    This program 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 this program; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 */
#ifdef HAVE_CVS_IDENT
#ident "$Id: net_design.cc,v 1.54 2007/06/05 04:18:09 steve Exp $"
#endif

# include "config.h"

# include  <iostream>

/*
 * This source file contains all the implementations of the Design
 * class declared in netlist.h.
 */

# include  "netlist.h"
# include  "util.h"
# include  "compiler.h"
# include  "netmisc.h"
# include  <sstream>

Design:: Design()
: errors(0), nodes_(0), procs_(0), lcounter_(0)
{
      procs_idx_ = 0;
      des_precision_ = 0;
      nodes_functor_cur_ = 0;
      nodes_functor_nxt_ = 0;
}

Design::~Design()
{
}

string Design::local_symbol(const string&path)
{
      ostringstream res;
      res << path << "." << "_L" << lcounter_;
      lcounter_ += 1;

      return res.str();
}

void Design::set_precision(int val)
{
      if (val < des_precision_)
            des_precision_ = val;
}

int Design::get_precision() const
{
      return des_precision_;
}

uint64_t Design::scale_to_precision(uint64_t val,
                                    const NetScope*scope) const
{
      int units = scope->time_unit();
      assert( units >= des_precision_ );

      while (units > des_precision_) {
            units -= 1;
            val *= 10;
      }

      return val;
}

NetScope* Design::make_root_scope(perm_string root)
{
      NetScope *root_scope_;
      root_scope_ = new NetScope(0, hname_t(root), NetScope::MODULE);
        /* This relies on the fact that the basename return value is
           permallocated. */
      root_scope_->set_module_name(root_scope_->basename());
      root_scopes_.push_back(root_scope_);
      return root_scope_;
}

NetScope* Design::find_root_scope()
{
      assert(root_scopes_.front());
      return root_scopes_.front();
}

list<NetScope*> Design::find_root_scopes()
{
      return root_scopes_;
}

const list<NetScope*> Design::find_root_scopes() const
{
      return root_scopes_;
}

/*
 * This method locates a scope in the design, given its rooted
 * hierarchical name. Each component of the key is used to scan one
 * more step down the tree until the name runs out or the search
 * fails.
 */
NetScope* Design::find_scope(const std::list<hname_t>&path) const
{
      if (path.empty())
            return 0;

      for (list<NetScope*>::const_iterator scope = root_scopes_.begin()
                 ; scope != root_scopes_.end(); scope++) {

            NetScope*cur = *scope;
            if (path.front() != cur->fullname())
                  continue;

            std::list<hname_t> tmp = path;
            tmp.pop_front();

            while (cur) {
                  if (tmp.empty()) return cur;

                  cur = cur->child( tmp.front() );

                  tmp.pop_front();
            }

      }

      return 0;
}

/*
 * This is a relative lookup of a scope by name. The starting point is
 * the scope parameter within which I start looking for the scope. If
 * I do not find the scope within the passed scope, start looking in
 * parent scopes until I find it, or I run out of parent scopes.
 */
NetScope* Design::find_scope(NetScope*scope, const std::list<hname_t>&path) const
{
      assert(scope);
      if (path.empty())
            return scope;

      for ( ; scope ;  scope = scope->parent()) {

            std::list<hname_t> tmp = path;

            NetScope*cur = scope;
            do {
                  hname_t key = tmp.front();
                  if (cur->type() == NetScope::MODULE
                      && cur->module_name()==key.peek_name()) {

                          /* Up references may match module name */

                  } else {
                        cur = cur->child( key );
                        if (cur == 0) break;
                  }
                  tmp.pop_front();
            } while (!tmp.empty());

            if (cur) return cur;
      }

        // Last chance. Look for the name starting at the root.
      return find_scope(path);
}

/*
 * This method runs through the scope, noticing the defparam
 * statements that were collected during the elaborate_scope pass and
 * applying them to the target parameters. The implementation actually
 * works by using a specialized method from the NetScope class that
 * does all the work for me.
 */
void Design::run_defparams()
{
      for (list<NetScope*>::const_iterator scope = root_scopes_.begin();
           scope != root_scopes_.end(); scope++)
            (*scope)->run_defparams(this);
}

void NetScope::run_defparams(Design*des)
{
      { NetScope*cur = sub_;
        while (cur) {
              cur->run_defparams(des);
              cur = cur->sib_;
        }
      }

      map<pform_name_t,NetExpr*>::const_iterator pp;
      for (pp = defparams.begin() ;  pp != defparams.end() ;  pp ++ ) {
            NetExpr*val = (*pp).second;
            pform_name_t path = (*pp).first;

            perm_string perm_name = peek_tail_name(path);
            path.pop_back();

            list<hname_t> eval_path = eval_scope_path(des, this, path);

              /* If there is no path on the name, then the targ_scope
                 is the current scope. */
            NetScope*targ_scope = des->find_scope(this, eval_path);
            if (targ_scope == 0) {
                  cerr << val->get_line() << ": warning: scope of " <<
                        path << "." << perm_name << " not found." << endl;
                  continue;
            }

            bool flag = targ_scope->replace_parameter(perm_name, val);
            if (! flag) {
                  cerr << val->get_line() << ": warning: parameter "
                       << perm_name << " not found in "
                       << scope_path(targ_scope) << "." << endl;
            }

      }
}

void Design::evaluate_parameters()
{
      for (list<NetScope*>::const_iterator scope = root_scopes_.begin();
           scope != root_scopes_.end(); scope++)
            (*scope)->evaluate_parameters(this);
}

void NetScope::evaluate_parameters(Design*des)
{
      NetScope*cur = sub_;
      while (cur) {
            cur->evaluate_parameters(des);
            cur = cur->sib_;
      }


        // Evaluate the parameter values. The parameter expressions
        // have already been elaborated and replaced by the scope
        // scanning code. Now the parameter expression can be fully
        // evaluated, or it cannot be evaluated at all.

      typedef map<perm_string,param_expr_t>::iterator mparm_it_t;

      for (mparm_it_t cur = parameters.begin()
                 ; cur != parameters.end() ;  cur ++) {

            long msb = 0;
            long lsb = 0;
            bool range_flag = false;
            NetExpr*expr;

              /* Evaluate the msb expression, if it is present. */
            expr = (*cur).second.msb;

            if (expr) {

                  NetEConst*tmp = dynamic_cast<NetEConst*>(expr);

                  if (! tmp) {

                        NetExpr*nexpr = expr->eval_tree();
                        if (nexpr == 0) {
                              cerr << (*cur).second.expr->get_line()
                                   << ": internal error: "
                                   << "unable to evaluate msb expression "
                                   << "for parameter " << (*cur).first << ": "
                                   << *expr << endl;
                              des->errors += 1;
                              continue;
                        }

                        assert(nexpr);
                        delete expr;
                        (*cur).second.msb = nexpr;

                        tmp = dynamic_cast<NetEConst*>(nexpr);
                  }

                  assert(tmp);
                  msb = tmp->value().as_long();
                  range_flag = true;
            }

              /* Evaluate the lsb expression, if it is present. */
            expr = (*cur).second.lsb;
            if (expr) {

                  NetEConst*tmp = dynamic_cast<NetEConst*>(expr);

                  if (! tmp) {

                        NetExpr*nexpr = expr->eval_tree();
                        if (nexpr == 0) {
                              cerr << (*cur).second.expr->get_line()
                                   << ": internal error: "
                                   << "unable to evaluate lsb expression "
                                   << "for parameter " << (*cur).first << ": "
                                   << *expr << endl;
                              des->errors += 1;
                              continue;
                        }

                        assert(nexpr);
                        delete expr;
                        (*cur).second.lsb = nexpr;

                        tmp = dynamic_cast<NetEConst*>(nexpr);
                  }

                  assert(tmp);
                  lsb = tmp->value().as_long();

                  assert(range_flag);
            }


              /* Evaluate the parameter expression, if necessary. */
            expr = (*cur).second.expr;
            assert(expr);

            switch (expr->expr_type()) {
                case IVL_VT_REAL:
                  if (! dynamic_cast<const NetECReal*>(expr)) {

                        NetExpr*nexpr = expr->eval_tree();
                        if (nexpr == 0) {
                              cerr << (*cur).second.expr->get_line()
                                   << ": internal error: "
                                   << "unable to evaluate real parameter value: "
                                   << *expr << endl;
                              des->errors += 1;
                              continue;
                        }

                        assert(nexpr);
                        delete expr;
                        (*cur).second.expr = nexpr;
                  }
                  break;

                case IVL_VT_LOGIC:
                case IVL_VT_BOOL:
                  if (! dynamic_cast<const NetEConst*>(expr)) {

                          // Try to evaluate the expression.
                        NetExpr*nexpr = expr->eval_tree();
                        if (nexpr == 0) {
                              cerr << (*cur).second.expr->get_line()
                                   << ": internal error: "
                                   << "unable to evaluate parameter "
                                   << (*cur).first
                                   << " value: " <<
                                    *expr << endl;
                              des->errors += 1;
                              continue;
                        }

                          // The evaluate worked, replace the old
                          // expression with this constant value.
                        assert(nexpr);
                        delete expr;
                        (*cur).second.expr = nexpr;

                          // Set the signedness flag.
                        (*cur).second.expr
                              ->cast_signed( (*cur).second.signed_flag );
                  }
                  break;

                default:
                  cerr << (*cur).second.expr->get_line()
                       << ": internal error: "
                       << "unhandled expression type?" << endl;
                  des->errors += 1;
                  continue;
            }

              /* If the parameter has range information, then make
                 sure the value is set right. */
            if (range_flag) {
                  unsigned long wid = (msb >= lsb)? msb - lsb : lsb - msb;
                  wid += 1;

                  NetEConst*val = dynamic_cast<NetEConst*>((*cur).second.expr);
                  assert(val);

                  verinum value = val->value();

                  if (! (value.has_len()
                         && (value.len() == wid)
                         && (value.has_sign() == (*cur).second.signed_flag))) {

                        verinum tmp (value, wid);
                        tmp.has_sign ( (*cur).second.signed_flag );
                        delete val;
                        val = new NetEConst(tmp);
                        (*cur).second.expr = val;
                  }
            }
      }

}

const char* Design::get_flag(const string&key) const
{
      map<string,const char*>::const_iterator tmp = flags_.find(key);
      if (tmp == flags_.end())
            return "";
      else
            return (*tmp).second;
}

/*
 * This method looks for a signal (reg, wire, whatever) starting at
 * the specified scope. If the name is hierarchical, it is split into
 * scope and name and the scope used to find the proper starting point
 * for the real search.
 *
 * It is the job of this function to properly implement Verilog scope
 * rules as signals are concerned.
 */
NetNet* Design::find_signal(NetScope*scope, pform_name_t path)
{
      assert(scope);

      perm_string key = peek_tail_name(path);
      path.pop_back();
      if (! path.empty()) {
            list<hname_t> eval_path = eval_scope_path(this, scope, path);
            scope = find_scope(scope, eval_path);
      }

      while (scope) {
            if (NetNet*net = scope->find_signal(key))
                  return net;

            if (scope->type() == NetScope::MODULE)
                  break;

            scope = scope->parent();
      }

      return 0;
}

NetFuncDef* Design::find_function(NetScope*scope, const pform_name_t&name)
{
      assert(scope);

      std::list<hname_t> eval_path = eval_scope_path(this, scope, name);
      NetScope*func = find_scope(scope, eval_path);
      if (func && (func->type() == NetScope::FUNC))
            return func->func_def();

      return 0;
}

NetScope* Design::find_task(NetScope*scope, const pform_name_t&name)
{
      std::list<hname_t> eval_path = eval_scope_path(this, scope, name);
      NetScope*task = find_scope(scope, eval_path);
      if (task && (task->type() == NetScope::TASK))
            return task;

      return 0;
}

void Design::add_node(NetNode*net)
{
      assert(net->design_ == 0);
      if (nodes_ == 0) {
            net->node_next_ = net;
            net->node_prev_ = net;
      } else {
            net->node_next_ = nodes_->node_next_;
            net->node_prev_ = nodes_;
            net->node_next_->node_prev_ = net;
            net->node_prev_->node_next_ = net;
      }
      nodes_ = net;
      net->design_ = this;
}

void Design::del_node(NetNode*net)
{
      assert(net->design_ == this);
      assert(net != 0);

        /* Interact with the Design::functor method by manipulating the
           cur and nxt pointers that it is using. */
      if (net == nodes_functor_nxt_)
            nodes_functor_nxt_ = nodes_functor_nxt_->node_next_;
      if (net == nodes_functor_nxt_)
            nodes_functor_nxt_ = 0;

      if (net == nodes_functor_cur_)
            nodes_functor_cur_ = 0;

        /* Now perform the actual delete. */
      if (nodes_ == net)
            nodes_ = net->node_prev_;

      if (nodes_ == net) {
            nodes_ = 0;
      } else {
            net->node_next_->node_prev_ = net->node_prev_;
            net->node_prev_->node_next_ = net->node_next_;
      }

      net->design_ = 0;
}

void Design::add_process(NetProcTop*pro)
{
      pro->next_ = procs_;
      procs_ = pro;
}

void Design::delete_process(NetProcTop*top)
{
      assert(top);
      if (procs_ == top) {
            procs_ = top->next_;

      } else {
            NetProcTop*cur = procs_;
            while (cur->next_ != top) {
                  assert(cur->next_);
                  cur = cur->next_;
            }

            cur->next_ = top->next_;
      }

      if (procs_idx_ == top)
            procs_idx_ = top->next_;

      delete top;
}

/*
 * $Log: net_design.cc,v $
 * Revision 1.54  2007/06/05 04:18:09  steve
 *  Upward names may reference modules by module_name.
 *
 * Revision 1.53  2007/06/02 03:42:13  steve
 *  Properly evaluate scope path expressions.
 *
 * Revision 1.52  2007/05/24 04:07:12  steve
 *  Rework the heirarchical identifier parse syntax and pform
 *  to handle more general combinations of heirarch and bit selects.
 *
 * Revision 1.51  2007/04/26 03:06:22  steve
 *  Rework hname_t to use perm_strings.
 *
 * Revision 1.50  2006/08/08 05:11:37  steve
 *  Handle 64bit delay constants.
 *
 * Revision 1.49  2006/07/31 03:50:17  steve
 *  Add support for power in constant expressions.
 *
 * Revision 1.48  2005/11/27 05:56:20  steve
 *  Handle bit select of parameter with ranges.
 *
 * Revision 1.47  2005/09/14 02:53:14  steve
 *  Support bool expressions and compares handle them optimally.
 *
 * Revision 1.46  2005/07/11 16:56:50  steve
 *  Remove NetVariable and ivl_variable_t structures.
 *
 * Revision 1.45  2004/10/04 01:10:54  steve
 *  Clean up spurious trailing white space.
 *
 * Revision 1.44  2004/02/20 06:22:56  steve
 *  parameter keys are per_strings.
 *
 * Revision 1.43  2004/02/18 17:11:56  steve
 *  Use perm_strings for named langiage items.
 *
 * Revision 1.42  2003/11/10 20:59:03  steve
 *  Design::get_flag returns const char* instead of string.
 *
 * Revision 1.41  2003/09/20 01:05:36  steve
 *  Obsolete find_symbol and find_event from the Design class.
 *
 * Revision 1.40  2003/09/19 03:50:12  steve
 *  Remove find_memory method from Design class.
 *
 * Revision 1.39  2003/09/19 03:30:05  steve
 *  Fix name search in elab_lval.
 *
 * Revision 1.38  2003/08/28 04:11:19  steve
 *  Spelling patch.
 *
 * Revision 1.37  2003/06/24 01:38:02  steve
 *  Various warnings fixed.
 *
 * Revision 1.36  2003/03/10 23:40:53  steve
 *  Keep parameter constants for the ivl_target API.
 *
 * Revision 1.35  2003/03/06 04:37:12  steve
 *  lex_strings.add module names earlier.
 *
 * Revision 1.34  2003/02/01 23:37:34  steve
 *  Allow parameter expressions to be type real.
 *
 * Revision 1.33  2003/01/27 05:09:17  steve
 *  Spelling fixes.
 *
 * Revision 1.32  2003/01/26 21:15:58  steve
 *  Rework expression parsing and elaboration to
 *  accommodate real/realtime values and expressions.
 *
 * Revision 1.31  2003/01/14 21:16:18  steve
 *  Move strstream to ostringstream for compatibility.
 *
 * Revision 1.30  2002/12/07 02:49:24  steve
 *  Named event triggers can take hierarchical names.
 *
 * Revision 1.29  2002/11/02 03:27:52  steve
 *  Allow named events to be referenced by
 *  hierarchical names.
 *
 * Revision 1.28  2002/10/19 22:59:49  steve
 *  Redo the parameter vector support to allow
 *  parameter names in range expressions.
 *
 * Revision 1.27  2002/08/16 05:18:27  steve
 *  Fix intermix of node functors and node delete.
 *
 * Revision 1.26  2002/08/12 01:34:59  steve
 *  conditional ident string using autoconfig.
 *
 * Revision 1.25  2002/07/03 05:34:59  steve
 *  Fix scope search for events.
 *
 * Revision 1.24  2002/06/25 02:39:34  steve
 *  Fix mishandling of incorect defparam error message.
 *
 * Revision 1.23  2001/12/03 04:47:15  steve
 *  Parser and pform use hierarchical names as hname_t
 *  objects instead of encoded strings.
 *
 * Revision 1.22  2001/10/20 05:21:51  steve
 *  Scope/module names are char* instead of string.
 */