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#ifndef __PTask_H
#define __PTask_H
/*
* Copyright (c) 1999-2000 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) && !defined(macintosh)
#ident "$Id: PTask.h,v 1.8 2000/03/08 04:36:53 steve Exp $"
#endif

# include "LineInfo.h"
# include "svector.h"
# include <string>
class Design;
class NetScope;
class PWire;
class Statement;

/*
* The PTask holds the parsed definitions of a task.
*/
class PTask : public LineInfo {

    public:
      explicit PTask(svector<PWire*>*p, Statement*s);
      ~PTask();

// Tasks introduce scope, to need to be handled during the
// scope elaboration pass. The scope passed is my scope,
// created by the containing scope. I fill it in with stuff if
// I need to.
      void elaborate_scope(Design*des, NetScope*scope) const;

      void elaborate_1(Design*des, const string&path) const;
      void elaborate_2(Design*des, const string&path) const;

      void dump(ostream&, unsigned) const;

    private:
      svector<PWire*>*ports_;
      Statement*statement_;

    private: // Not implemented
      PTask(const PTask&);
      PTask& operator=(const PTask&);
};

/*
* The function is similar to a task (in this context) but there is a
* single output port and a set of input ports. The output port is the
* function return value.
*/
class PFunction : public LineInfo {

    public:
      explicit PFunction(svector<PWire *>*p, Statement *s);
      ~PFunction();

      void set_output(PWire*);

      void elaborate_scope(Design*des, NetScope*scope) const;

/* Functions are elaborated in 2 passes. */
      void elaborate_1(Design *des, NetScope*) const;
      void elaborate_2(Design *des, NetScope*) const;

      void dump(ostream&, unsigned) const;

    private:
      PWire*out_;
      svector<PWire *> *ports_;
      Statement *statement_;
};

/*
* $Log: PTask.h,v $
* Revision 1.8 2000/03/08 04:36:53 steve
* Redesign the implementation of scopes and parameters.
* I now generate the scopes and notice the parameters
* in a separate pass over the pform. Once the scopes
* are generated, I can process overrides and evalutate
* paremeters before elaboration begins.
*
* Revision 1.7 2000/02/23 02:56:53 steve
* Macintosh compilers do not support ident.
*
* Revision 1.6 1999/09/30 21:28:34 steve
* Handle mutual reference of tasks by elaborating
* task definitions in two passes, like functions.
*
* Revision 1.5 1999/09/01 20:46:19 steve
* Handle recursive functions and arbitrary function
* references to other functions, properly pass
* function parameters and save function results.
*
* Revision 1.4 1999/08/25 22:22:41 steve
* elaborate some aspects of functions.
*
* Revision 1.3 1999/07/31 19:14:47 steve
* Add functions up to elaboration (Ed Carter)
*
* Revision 1.2 1999/07/24 02:11:19 steve
* Elaborate task input ports.
*
* Revision 1.1 1999/07/03 02:12:51 steve
* Elaborate user defined tasks.
*
*/
#endif
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