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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
*/
#ifdef HAVE_CVS_IDENT
#ident "$Id: PTask.h,v 1.13 2004/05/31 23:34:36 steve Exp $"
#endif

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

enum PTaskFuncEnum {
      PTF_NONE,
      PTF_REG,
      PTF_INTEGER,
      PTF_REAL,
      PTF_REALTIME,
      PTF_TIME
};

struct PTaskFuncArg {
      PTaskFuncEnum type;
      svector<PExpr*>*range;
};

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

    public:
      explicit PTask();
      ~PTask();

      void set_ports(svector<PWire *>*p);
      void set_statement(Statement *s);

// 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;

// Bind the ports to the regs that are the ports.
      void elaborate_sig(Design*des, NetScope*scope) const;

// Elaborate the statement to finish off the task definition.
      void elaborate(Design*des, NetScope*scope) 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.
*
* The output value is not elaborated until elaborate_sig.
*/
class PFunction : public LineInfo {

    public:
      explicit PFunction(perm_string name);
      ~PFunction();

      void set_ports(svector<PWire *>*p);
      void set_statement(Statement *s);
      void set_return(PTaskFuncArg t);

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

/* elaborate the ports and return value. */
      void elaborate_sig(Design *des, NetScope*) const;

/* Elaborate the behavioral statement. */
      void elaborate(Design *des, NetScope*) const;

      void dump(ostream&, unsigned) const;

    private:
      perm_string name_;
      PTaskFuncArg return_type_;
      svector<PWire *> *ports_;
      Statement *statement_;
};

/*
* $Log: PTask.h,v $
* Revision 1.13 2004/05/31 23:34:36 steve
* Rewire/generalize parsing an elaboration of
* function return values to allow for better
* speed and more type support.
*
* Revision 1.12 2002/08/12 01:34:58 steve
* conditional ident string using autoconfig.
*
* Revision 1.11 2001/11/22 06:20:59 steve
* Use NetScope instead of string for scope path.
*
* Revision 1.10 2001/01/13 22:20:08 steve
* Parse parameters within nested scopes.
*
* Revision 1.9 2000/07/30 18:25:43 steve
* Rearrange task and function elaboration so that the
* NetTaskDef and NetFuncDef functions are created during
* signal enaboration, and carry these objects in the
* NetScope class instead of the extra, useless map in
* the Design class.
*
* 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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