Package Instantiation in VHDL

[mewais]

Hi,

VHDL 2008 allows for instantiation of packages that have generics. For example:

library IEEE;

package fixed_pkg is new IEEE.fixed_generic_pkg
  generic map (
    fixed_round_style    => IEEE.fixed_float_types.fixed_round,
    fixed_overflow_style => IEEE.fixed_float_types.fixed_saturate,
    fixed_guard_bits     => 3,
    no_warning           => false
    );

This unfortunately does not get compiled correctly, or rather, does not get compiled at all. My AST for this file has only the following:

"fixed_pkg.vhdl": [
    {
        "__class__": "HdlLibrary",
        "position": [
            43,
            9,
            43,
            12
        ],
        "name": {
            "__class__": "str",
            "val": "IEEE"
        }
    }
]

[mewais]

In case you want the original fixed_generic_pkg, it's quiet big so I attached only the relevant part (generics and a bit after):

-- --------------------------------------------------------------------
--
-- Copyright � 2008 by IEEE.
--
-- This source file is an essential part of IEEE Std 1076-2008, 
-- IEEE Standard VHDL Language Reference Manual. Verbatim copies of this 
-- source file may be used and distributed without restriction. 
-- Modifications to this source file as permitted in IEEE Std 1076-2008
-- may also be made and distributed. All other uses require permission 
-- from the IEEE Standards Department(stds-ipr@ieee.org). 
-- All other rights reserved.
--
-- This source file is provided on an AS IS basis. The IEEE disclaims ANY 
-- WARRANTY EXPRESS OR IMPLIED INCLUDING ANY WARRANTY OF MERCHANTABILITY 
-- AND FITNESS FOR USE FOR A PARTICULAR PURPOSE. The user of the source file 
-- shall indemnify and hold IEEE harmless from any damages or liability 
-- arising out of the use thereof.
--
--   Title     :  Fixed-point package (Generic package declaration)
--             :
--   Library   :  This package shall be compiled into a library
--             :  symbolically named IEEE.
--             :
--   Developers:  Accellera VHDL-TC and IEEE P1076 Working Group
--             :
--   Purpose   :  This packages defines basic binary fixed point
--             :  arithmetic functions
--             :
--   Note      :  This package may be modified to include additional data
--             :  required by tools, but it must in no way change the
--             :  external interfaces or simulation behavior of the
--             :  description. It is permissible to add comments and/or
--             :  attributes to the package declarations, but not to change
--             :  or delete any original lines of the package declaration.
--             :  The package body may be changed only in accordance with
--             :  the terms of Clause 16 of this standard.
--             :
-- --------------------------------------------------------------------
-- $Revision: 1220 $
-- $Date: 2008-04-10 17:16:09 +0930 (Thu, 10 Apr 2008) $
-- --------------------------------------------------------------------

library STD;
use STD.TEXTIO.all;

library IEEE;
use IEEE.STD_LOGIC_1164.all;
use IEEE.NUMERIC_STD.all;
use IEEE.fixed_float_types.all;

package fixed_generic_pkg is
  generic (
    -- Rounding routine to use in fixed point, fixed_round or fixed_truncate
    fixed_round_style    : fixed_round_style_type    := fixed_round;
    -- Overflow routine to use in fixed point, fixed_saturate or fixed_wrap
    fixed_overflow_style : fixed_overflow_style_type := fixed_saturate;
    -- Extra bits used in divide routines
    fixed_guard_bits     : NATURAL                   := 3;
    -- If TRUE, then turn off warnings on "X" propagation
    no_warning           : BOOLEAN                   := false
    );

  -- Author David Bishop (dbishop@vhdl.org)
  constant CopyRightNotice : STRING :=
    "Copyright 2008 by IEEE. All rights reserved.";

  -- base Unsigned fixed point type, downto direction assumed
  type UNRESOLVED_ufixed is array (INTEGER range <>) of STD_ULOGIC;
  -- base Signed fixed point type, downto direction assumed
  type UNRESOLVED_sfixed is array (INTEGER range <>) of STD_ULOGIC;

  -- BLA BLA BLA

end package fixed_generic_pkg;

[Nic30]

This will require some API changes.

1. Extract shared code from HdlComponentInstance (name, parameter map, ...) to HdlTemplateInstance and then create HdlPackageInstance
2. Extract shared code from HdlModuleDec (name, parameter defs ...) to HdlTemplate, represent vhdl package/package body with HdlTemplate of HdlClassDef with type package/package body instead of HdlValueIdspace
3. HdlValueIdspace -> HdlNamespace as now it represents only namespaces