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-- Nodes recognizer for ieee.std_logic_1164.
-- Copyright (C) 2002, 2003, 2004, 2005 Tristan Gingold
--
-- GHDL 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, or (at your option) any later
-- version.
--
-- GHDL 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 GHDL; see the file COPYING. If not, write to the Free
-- Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-- 02111-1307, USA.
with Types; use Types;
with Std_Names; use Std_Names;
with Errorout; use Errorout;
with Std_Package;
package body Ieee.Std_Logic_1164 is
function Skip_Implicit (Decl : Iir) return Iir
is
Res : Iir;
begin
Res := Decl;
loop
exit when Res = Null_Iir;
exit when Get_Kind (Res) /= Iir_Kind_Implicit_Function_Declaration;
Res := Get_Chain (Res);
end loop;
return Res;
end Skip_Implicit;
procedure Extract_Declarations (Pkg : Iir_Package_Declaration)
is
Error : exception;
Decl : Iir;
Def : Iir;
begin
Std_Logic_1164_Pkg := Pkg;
Decl := Get_Declaration_Chain (Pkg);
-- Skip a potential copyright constant.
if Decl /= Null_Iir
and then Get_Kind (Decl) = Iir_Kind_Constant_Declaration
and then (Get_Base_Type (Get_Type (Decl))
= Std_Package.String_Type_Definition)
then
Decl := Get_Chain (Decl);
end if;
-- The first declaration should be type std_ulogic.
if Decl = Null_Iir
or else Get_Kind (Decl) /= Iir_Kind_Type_Declaration
or else Get_Identifier (Decl) /= Name_Std_Ulogic
then
raise Error;
end if;
Def := Get_Type (Decl);
if Get_Kind (Def) /= Iir_Kind_Enumeration_Type_Definition then
raise Error;
end if;
Std_Ulogic_Type := Def;
-- The second declaration should be std_ulogic_vector.
Decl := Get_Chain (Decl);
Decl := Skip_Implicit (Decl);
if Decl = Null_Iir
or else Get_Kind (Decl) /= Iir_Kind_Type_Declaration
or else Get_Identifier (Decl) /= Name_Std_Ulogic_Vector
then
raise Error;
end if;
Def := Get_Type (Decl);
if Get_Kind (Def) /= Iir_Kind_Array_Type_Definition then
raise Error;
end if;
Std_Ulogic_Vector_Type := Def;
-- The third declaration should be resolved.
Decl := Get_Chain (Decl);
Decl := Skip_Implicit (Decl);
if Decl = Null_Iir
or else Get_Kind (Decl) /= Iir_Kind_Function_Declaration
then
-- FIXME: check name ?
raise Error;
end if;
Resolved := Decl;
-- The fourth declaration should be std_logic.
Decl := Get_Chain (Decl);
Decl := Skip_Implicit (Decl);
if Decl = Null_Iir
or else Get_Kind (Decl) /= Iir_Kind_Subtype_Declaration
or else Get_Identifier (Decl) /= Name_Std_Logic
then
raise Error;
end if;
Def := Get_Type (Decl);
if Get_Kind (Def) /= Iir_Kind_Enumeration_Subtype_Definition then
raise Error;
end if;
Std_Logic_Type := Def;
-- The fifth declaration should be std_logic_vector.
Decl := Get_Chain (Decl);
Decl := Skip_Implicit (Decl);
if Decl = Null_Iir
or else (Get_Kind (Decl) /= Iir_Kind_Type_Declaration
and then Get_Kind (Decl) /= Iir_Kind_Subtype_Declaration)
or else Get_Identifier (Decl) /= Name_Std_Logic_Vector
then
raise Error;
end if;
Def := Get_Type (Decl);
-- if Get_Kind (Def) /= Iir_Kind_Array_Type_Definition then
-- raise Error;
-- end if;
Std_Logic_Vector_Type := Def;
-- Skip any declarations but functions.
loop
Decl := Get_Chain (Decl);
exit when Decl = Null_Iir;
if Get_Kind (Decl) = Iir_Kind_Function_Declaration then
if Get_Identifier (Decl) = Name_Rising_Edge then
Rising_Edge := Decl;
elsif Get_Identifier (Decl) = Name_Falling_Edge then
Falling_Edge := Decl;
end if;
end if;
end loop;
-- Since rising_edge and falling_edge do not read activity of its
-- parameter, clear the flag to allow more optimizations.
if Rising_Edge /= Null_Iir then
Set_Has_Active_Flag
(Get_Interface_Declaration_Chain (Rising_Edge), False);
else
raise Error;
end if;
if Falling_Edge /= Null_Iir then
Set_Has_Active_Flag
(Get_Interface_Declaration_Chain (Falling_Edge), False);
else
raise Error;
end if;
exception
when Error =>
Error_Msg_Sem ("package ieee.std_logic_1164 is ill-formed", Pkg);
-- Clear all definitions.
Std_Logic_1164_Pkg := Null_Iir;
Std_Ulogic_Type := Null_Iir;
Std_Ulogic_Vector_Type := Null_Iir;
Std_Logic_Type := Null_Iir;
Std_Logic_Vector_Type := Null_Iir;
Rising_Edge := Null_Iir;
Falling_Edge := Null_Iir;
end Extract_Declarations;
end Ieee.Std_Logic_1164;
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