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/*
* Copyright (c) 2008 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
*/

# include "config.h"
# include "compiler.h"
# include "pform.h"
# include "parse_misc.h"
# include "discipline.h"

map<perm_string,ivl_nature_t> natures;
map<perm_string,ivl_discipline_t> disciplines;
map<perm_string,ivl_nature_t> access_function_nature;

static perm_string nature_name = perm_string();
static perm_string nature_access = perm_string();

void pform_start_nature(const char*name)
{
      nature_name = lex_strings.make(name);
}

void pform_nature_access(const struct vlltype&loc, const char*name)
{
      if (nature_access) {
cerr << loc.text << ":" << loc.first_line << ": error: "
<< "Too many access names for nature "
<< nature_name << "." << endl;
error_count += 1;
return;
      }

      nature_access = lex_strings.make(name);
}

void pform_end_nature(const struct vlltype&loc)
{
// The nature access function is required. If it is missing,
// then signal an error. For a temporary expedient, we can set
// the nature name as the access function, but don't expect it
// to work.
      if (! nature_access) {
cerr << loc.text << ":" << loc.first_line << ": error: "
<< "Missing access name for nature "
<< nature_name << "." << endl;
error_count += 1;
nature_access = nature_name;
      }

      ivl_nature_s*tmp = new ivl_nature_s(nature_name, nature_access);
      FILE_NAME(tmp, loc);

      natures[nature_name] = tmp;

// Make sure the access function is not used by multiple
// different natures.
      if (ivl_nature_t dup_access_nat = access_function_nature[nature_access]) {
cerr << tmp->get_fileline() << ": error: "
<< "Access function name " << nature_access
<< " is already used by nature " << dup_access_nat->name()
<< " declared at " << dup_access_nat->get_fileline()
<< "." << endl;
error_count += 1;
      }

// Map the access function back to the nature so that
// expressions that use the access function can find it.
      access_function_nature[nature_access] = tmp;

      nature_name = perm_string();
      nature_access = perm_string();
}


static perm_string discipline_name;
static ivl_dis_domain_t discipline_domain = IVL_DIS_NONE;
static ivl_nature_t discipline_potential = 0;
static ivl_nature_t discipline_flow = 0;

void pform_start_discipline(const char*name)
{
      discipline_name = lex_strings.make(name);
      discipline_domain = IVL_DIS_NONE;
}

void pform_discipline_domain(const struct vlltype&loc, ivl_dis_domain_t use_domain)
{
      assert(use_domain != IVL_DIS_NONE);

      if (discipline_domain != IVL_DIS_NONE) {
cerr << loc.text << ":" << loc.first_line << ": error: "
<< "Too many domain attributes for discipline "
<< discipline_name << "." << endl;
error_count += 1;
return;
      }

      discipline_domain = use_domain;
}

void pform_discipline_potential(const struct vlltype&loc, const char*name)
{
      if (discipline_potential) {
cerr << loc.text << ":" << loc.first_line << ": error: "
<< "Too many potential natures for discipline "
<< discipline_name << "." << endl;
error_count += 1;
return;
      }

      perm_string key = lex_strings.make(name);
      discipline_potential = natures[key];

      if (discipline_potential == 0) {
cerr << loc.text << ":" << loc.first_line << ": error: "
<< "nature " << key << " is not declared." << endl;
error_count += 1;
return;
      }
}

void pform_discipline_flow(const struct vlltype&loc, const char*name)
{
      if (discipline_flow) {
cerr << loc.text << ":" << loc.first_line << ": error: "
<< "Too many flow natures for discipline "
<< discipline_name << "." << endl;
error_count += 1;
return;
      }

      perm_string key = lex_strings.make(name);
      discipline_flow = natures[key];

      if (discipline_flow == 0) {
cerr << loc.text << ":" << loc.first_line << ": error: "
<< "nature " << key << " is not declared." << endl;
error_count += 1;
return;
      }
}

void pform_end_discipline(const struct vlltype&loc)
{
// If the domain is not otherwise specified, then take it to
// be continuous if potential or flow natures are given.
      if (discipline_domain == IVL_DIS_NONE && (discipline_potential||discipline_flow))
discipline_domain = IVL_DIS_CONTINUOUS;

      ivl_discipline_t tmp = new ivl_discipline_s(discipline_name,
discipline_domain,
discipline_potential,
discipline_flow);
      disciplines[discipline_name] = tmp;

      FILE_NAME(tmp, loc);

/* Clear the static variables for the next item. */
      discipline_name = perm_string();
      discipline_domain = IVL_DIS_NONE;
      discipline_potential = 0;
      discipline_flow = 0;
}

/*
* The parser uses this function to attach a discipline to a wire. The
* wire may be declared by now, or will be declared further later. If
* it is already declared, we just attach the discipline. If it is not
* declared yet, then this is the declaration and we create the signal
* in the current lexical scope.
*/
void pform_attach_discipline(const struct vlltype&loc,
ivl_discipline_t discipline, list<perm_string>*names)
{
      for (list<perm_string>::iterator cur = names->begin()
; cur != names->end() ; cur ++ ) {

PWire* cur_net = pform_get_wire_in_scope(*cur);
if (cur_net == 0) {
/* Not declared yet, declare it now. */
pform_makewire(loc, *cur, NetNet::WIRE,
NetNet::NOT_A_PORT, IVL_VT_REAL, 0);
cur_net = pform_get_wire_in_scope(*cur);
assert(cur_net);
}

if (ivl_discipline_t tmp = cur_net->get_discipline()) {
cerr << loc.text << ":" << loc.first_line << ": error: "
<< "discipline " << discipline->name()
<< " cannot override existing discipline " << tmp->name()
<< " on net " << cur_net->basename() << endl;
error_count += 1;

} else {
cur_net->set_data_type(IVL_VT_REAL);
cur_net->set_discipline(discipline);
}
      }
}
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