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// Verilog Behavioral Simulator
// Copyright (C) 1995-1997,2001,2002 Lay Hoon Tho, Jimen Ching
// This file is part of the Verilog Behavioral Simulator package.
// See the file COPYRIGHT for copyright and disclaimer information.
// See the file COPYING for the licensing terms and conditions.
// See the file CONTRIBUTORS for a list of contributing authors.
// st_func.h
// Symbol table node to store a function definition.
// Note:  Function definitions are setup only if it is enabled in the
// module it was defined in. Thus, the tf declarations must be saved
// until setup is done.

#ifndef _ST_FUNC_H
#define _ST_FUNC_H

#include "common/ptr.h"
#include "common/event.h"
#include "stmt/stmtbase.h"
#include "moditm/tfbase.h"
#include "common/st_node.h"

class st_function : public st_node_base
      friend struct monitor_st_node;
      friend struct evaluate_st_node;
      friend struct setup_st_node;

      friend struct setup_expr;
      friend struct setup_stmt;
      friend struct trigger_stmt;
      friend struct setup_module_item;

      typedef num_type::position_type position_type;
      typedef num_type::size_type size_type;
      typedef stmt_base stmt_type;
      typedef tfdecl_base decl_type;
      typedef basic_ptr<decl_type> decl_ptr;
      typedef list_type<decl_ptr> decl_list;
      typedef list_type<hash_type> io_list;
      typedef event_base<stmt_type> event_type;
      typedef counted_ptr<event_type> event_ptr;
      typedef list_type<event_ptr> monitor_list;

      st_function(const str_type &, stmt_type *, decl_list * = 0);

      st_function *get_function();

      const size_type size() const
            { return _storage.size(); }

      ostream_type &display(ostream_type &) const;
      bool monitor(const monitor_type &);
      const num_type &evaluate(const evaluate_type &) const;
      void setup(const setup_type &);

      // Utility for function trigger.
      void assignment(const num_type &, position_type, position_type,
                              position_type, position_type);

      bool _done_setup;
      num_type _storage;
      stmt_type *_stmt;
      io_list *_iovariable;
      decl_list *_declaration;

      // List of monitor statements for functions.
      monitor_list *_monitor;

#endif // _ST_FUNC_H

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