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/*
* Copyright (c) 1998 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
*/
#if !defined(WINNT)
#ident "$Id: PExpr.cc,v 1.12 1999/12/31 17:38:37 steve Exp $"
#endif

# include "PExpr.h"
# include "Module.h"
# include <typeinfo>

PExpr::~PExpr()
{
}

bool PExpr::is_the_same(const PExpr*that) const
{
      return typeid(this) == typeid(that);
}

bool PExpr::is_constant(Module*) const
{
      return false;
}

NetNet* PExpr::elaborate_net(Design*des, const string&path, unsigned,
unsigned long,
unsigned long,
unsigned long) const
{
      cerr << get_line() << ": error: Unable to elaborate `"
<< *this << "' as gates." << endl;
      return 0;
}

NetNet* PExpr::elaborate_lnet(Design*des, const string&path) const
{
      cerr << get_line() << ": error: expression not valid in assign l-value: "
<< *this << endl;
      return 0;
}

bool PEBinary::is_constant(Module*mod) const
{
      return left_->is_constant(mod) && right_->is_constant(mod);
}

PECallFunction::PECallFunction(const string &n, const svector<PExpr *> &parms)
: name_(n), parms_(parms)
{
}

PECallFunction::~PECallFunction()
{
}

bool PEConcat::is_constant(Module *mod) const
{
      bool constant = repeat_? repeat_->is_constant(mod) : true;
      for (unsigned i = 0; constant && i < parms_.count(); ++i) {
constant = constant && parms_[i]->is_constant(mod);
      }
      return constant;
}

PEConcat::~PEConcat()
{
      delete repeat_;
}

/*
* An identifier can be in a constant expresion if (and only if) it is
* a parameter.
*/
bool PEIdent::is_constant(Module*mod) const
{
      map<string,PExpr*>::const_iterator cur = mod->parameters.find(text_);
      return cur != mod->parameters.end();
}

bool PENumber::is_the_same(const PExpr*that) const
{
      const PENumber*obj = dynamic_cast<const PENumber*>(that);
      if (obj == 0)
return false;

      return *value_ == *obj->value_;
}

bool PENumber::is_constant(Module*) const
{
      return true;
}

bool PEString::is_constant(Module*) const
{
      return true;
}

PETernary::PETernary(PExpr*e, PExpr*t, PExpr*f)
: expr_(e), tru_(t), fal_(f)
{
}

PETernary::~PETernary()
{
}

bool PETernary::is_constant(Module*) const
{
      return false;
}

/*
* $Log: PExpr.cc,v $
* Revision 1.12 1999/12/31 17:38:37 steve
* Standardize some of the error messages.
*
* Revision 1.11 1999/10/31 04:11:27 steve
* Add to netlist links pin name and instance number,
* and arrange in vvm for pin connections by name
* and instance number.
*
* Revision 1.10 1999/09/25 02:57:29 steve
* Parse system function calls.
*
* Revision 1.9 1999/09/16 04:18:15 steve
* elaborate concatenation repeats.
*
* Revision 1.8 1999/09/15 04:17:52 steve
* separate assign lval elaboration for error checking.
*
* Revision 1.7 1999/07/22 02:05:20 steve
* is_constant method for PEConcat.
*
* Revision 1.6 1999/07/17 19:50:59 steve
* netlist support for ternary operator.
*
* Revision 1.5 1999/06/16 03:13:29 steve
* More syntax parse with sorry stubs.
*
* Revision 1.4 1999/06/10 04:03:52 steve
* Add support for the Ternary operator,
* Add support for repeat concatenation,
* Correct some seg faults cause by elaboration
* errors,
* Parse the casex anc casez statements.
*
* Revision 1.3 1999/05/16 05:08:42 steve
* Redo constant expression detection to happen
* after parsing.
*
* Parse more operators and expressions.
*
* Revision 1.2 1998/11/11 00:01:51 steve
* Check net ranges in declarations.
*
* Revision 1.1 1998/11/03 23:28:53 steve
* Introduce verilog to CVS.
*
*/
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