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-- Types synthesis.
-- Copyright (C) 2017 Tristan Gingold
--
-- This file is part of GHDL.
--
-- This program is free software; you can redistribute it and/or modify
-- it 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., 51 Franklin Street - Fifth Floor, Boston,
-- MA 02110-1301, USA.
with Types; use Types;
with Mutils; use Mutils;
with Vhdl.Std_Package;
with Vhdl.Ieee.Std_Logic_1164;
with Vhdl.Utils; use Vhdl.Utils;
package body Synth.Types is
function Is_Bit_Type (Atype : Node) return Boolean
is
Btype : Node;
begin
if Atype = Vhdl.Ieee.Std_Logic_1164.Std_Ulogic_Type
or else Atype = Vhdl.Ieee.Std_Logic_1164.Std_Logic_Type
or else Atype = Vhdl.Std_Package.Boolean_Type_Definition
or else Atype = Vhdl.Std_Package.Bit_Type_Definition
then
return True;
end if;
Btype := Get_Base_Type (Atype);
if Btype = Atype then
return False;
else
return Is_Bit_Type (Btype);
end if;
end Is_Bit_Type;
function Is_Vector_Type (Atype : Node) return Boolean is
begin
return Is_Bit_Type (Get_Element_Subtype (Atype))
and then Get_Nbr_Dimensions (Atype) = 1;
end Is_Vector_Type;
function Get_Range_Width (Rng : Value_Range_Type) return Width
is
Low : Int64;
High : Int64;
begin
case Rng.Dir is
when Iir_To =>
Low := Rng.Left;
High := Rng.Right;
when Iir_Downto =>
Low := Rng.Right;
High := Rng.Left;
end case;
if Low > High then
return 0;
end if;
if Low >= 0 then
-- Positive.
return Width (Clog2 (Uns64 (High)));
elsif High < 0 then
-- Negative only.
-- FIXME: overflow.
return Width (Clog2 (Uns64 (-Low))) + 1;
else
declare
-- FIXME: overflow.
L : constant Width := Width (Clog2 (Uns64 (-Low)));
H : constant Width := Width (Clog2 (Uns64 (-High)));
begin
return Width'Max (L, H) + 1;
end;
end if;
end Get_Range_Width;
end Synth.Types;
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