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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 Name_Table;
with Std_Names; use Std_Names;
with Vhdl.Errors; use Vhdl.Errors;
package body Vhdl.Ieee.Std_Logic_1164 is
function Is_Scalar_Parameter (Inter : Iir) return Boolean is
begin
return Get_Base_Type (Get_Type (Inter)) = Std_Ulogic_Type;
end Is_Scalar_Parameter;
function Is_Vector_Parameter (Inter : Iir) return Boolean
is
Base_Type : constant Iir := Get_Base_Type (Get_Type (Inter));
begin
return Base_Type = Std_Ulogic_Vector_Type
or Base_Type = Std_Logic_Vector_Type;
end Is_Vector_Parameter;
-- Return True iff the profile of FUNC is: (l, r : std_ulogic)
function Is_Scalar_Scalar_Function (Func : Iir) return Boolean
is
Inter : constant Iir := Get_Interface_Declaration_Chain (Func);
Inter2 : Iir;
begin
if Get_Implicit_Definition (Func) /= Iir_Predefined_None then
return False;
end if;
if Inter = Null_Iir or else not Is_Scalar_Parameter (Inter) then
return False;
end if;
Inter2 := Get_Chain (Inter);
if Inter2 = Null_Iir or else not Is_Scalar_Parameter (Inter2) then
return False;
end if;
if Get_Chain (Inter2) /= Null_Iir then
return False;
end if;
return True;
end Is_Scalar_Scalar_Function;
-- Return True iff the profile of FUNC is: (l : std_ulogic)
function Is_Scalar_Function (Func : Iir) return Boolean
is
Inter : constant Iir := Get_Interface_Declaration_Chain (Func);
begin
if Get_Implicit_Definition (Func) /= Iir_Predefined_None then
return False;
end if;
if Inter = Null_Iir or else not Is_Scalar_Parameter (Inter) then
return False;
end if;
if Get_Chain (Inter) /= Null_Iir then
return False;
end if;
return True;
end Is_Scalar_Function;
-- Return True iff the profile of FUNC is: (l, r : std_[u]logic_vector)
function Is_Vector_Vector_Function (Func : Iir) return Boolean
is
Inter : constant Iir := Get_Interface_Declaration_Chain (Func);
Inter2 : Iir;
begin
if Get_Implicit_Definition (Func) /= Iir_Predefined_None then
return False;
end if;
if Inter = Null_Iir or else not Is_Vector_Parameter (Inter) then
return False;
end if;
Inter2 := Get_Chain (Inter);
if Inter2 = Null_Iir or else not Is_Vector_Parameter (Inter2) then
return False;
end if;
if Get_Chain (Inter2) /= Null_Iir then
return False;
end if;
return True;
end Is_Vector_Vector_Function;
-- Return True iff the profile of FUNC is: (l : std_[u]logic_vector)
function Is_Vector_Function (Func : Iir) return Boolean
is
Inter : constant Iir := Get_Interface_Declaration_Chain (Func);
begin
if Get_Implicit_Definition (Func) /= Iir_Predefined_None then
return False;
end if;
if Inter = Null_Iir or else not Is_Vector_Parameter (Inter) then
return False;
end if;
if Get_Chain (Inter) /= Null_Iir then
return False;
end if;
return True;
end Is_Vector_Function;
procedure Extract_Declarations (Pkg : Iir_Package_Declaration)
is
Error : exception;
Decl : Iir;
Def : Iir;
Predefined : Iir_Predefined_Functions;
begin
Std_Logic_1164_Pkg := Pkg;
Decl := Get_Declaration_Chain (Pkg);
-- Skip a potential copyright constant.
Decl := Skip_Copyright_Notice (Decl);
-- 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_Definition (Decl);
if Get_Kind (Def) /= Iir_Kind_Enumeration_Type_Definition then
raise Error;
end if;
Std_Ulogic_Type := Def;
-- Get node of some literals.
declare
use Name_Table;
Lit_List : constant Iir_Flist := Get_Enumeration_Literal_List (Def);
begin
if Get_Nbr_Elements (Lit_List) /= 9 then
raise Error;
end if;
Std_Ulogic_0 := Get_Nth_Element (Lit_List, 2);
Std_Ulogic_1 := Get_Nth_Element (Lit_List, 3);
if Get_Identifier (Std_Ulogic_0) /= Get_Identifier ('0')
or else Get_Identifier (Std_Ulogic_1) /= Get_Identifier ('1')
then
raise Error;
end if;
end;
-- 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_Definition (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;
-- Recognize not-predefined functions.
if Get_Kind (Decl) = Iir_Kind_Function_Declaration
and then Get_Implicit_Definition (Decl) = Iir_Predefined_None
then
-- Useless assignment ?
Predefined := Iir_Predefined_None;
case Get_Identifier (Decl) is
when Name_Rising_Edge =>
Predefined := Iir_Predefined_Ieee_1164_Rising_Edge;
-- Since rising_edge does not read activity of its
-- parameter, clear the flag to allow more optimizations.
Set_Has_Active_Flag
(Get_Interface_Declaration_Chain (Decl), False);
when Name_Falling_Edge =>
Predefined := Iir_Predefined_Ieee_1164_Falling_Edge;
-- Since falling_edge does not read activity of its
-- parameter, clear the flag to allow more optimizations.
Set_Has_Active_Flag
(Get_Interface_Declaration_Chain (Decl), False);
when Name_To_Bitvector =>
Predefined := Iir_Predefined_Ieee_1164_To_Bitvector;
when others =>
if Is_Scalar_Scalar_Function (Decl) then
case Get_Identifier (Decl) is
when Name_And =>
Predefined := Iir_Predefined_Ieee_1164_Scalar_And;
when Name_Nand =>
Predefined := Iir_Predefined_Ieee_1164_Scalar_Nand;
when Name_Or =>
Predefined := Iir_Predefined_Ieee_1164_Scalar_Or;
when Name_Nor =>
Predefined := Iir_Predefined_Ieee_1164_Scalar_Nor;
when Name_Xor =>
Predefined := Iir_Predefined_Ieee_1164_Scalar_Xor;
when Name_Xnor =>
Predefined := Iir_Predefined_Ieee_1164_Scalar_Xnor;
when others =>
Predefined := Iir_Predefined_None;
end case;
elsif Is_Scalar_Function (Decl) then
case Get_Identifier (Decl) is
when Name_Not =>
Predefined := Iir_Predefined_Ieee_1164_Scalar_Not;
when Name_Op_Condition =>
Predefined :=
Iir_Predefined_Ieee_1164_Condition_Operator;
when Name_Is_X =>
Predefined :=
Iir_Predefined_Ieee_1164_Scalar_Is_X;
when others =>
Predefined := Iir_Predefined_None;
end case;
elsif Is_Vector_Vector_Function (Decl) then
case Get_Identifier (Decl) is
when Name_And =>
Predefined := Iir_Predefined_Ieee_1164_Vector_And;
when Name_Nand =>
Predefined := Iir_Predefined_Ieee_1164_Vector_Nand;
when Name_Or =>
Predefined := Iir_Predefined_Ieee_1164_Vector_Or;
when Name_Nor =>
Predefined := Iir_Predefined_Ieee_1164_Vector_Nor;
when Name_Xor =>
Predefined := Iir_Predefined_Ieee_1164_Vector_Xor;
when Name_Xnor =>
Predefined := Iir_Predefined_Ieee_1164_Vector_Xnor;
when others =>
Predefined := Iir_Predefined_None;
end case;
elsif Is_Vector_Function (Decl) then
case Get_Identifier (Decl) is
when Name_Not =>
Predefined := Iir_Predefined_Ieee_1164_Vector_Not;
when Name_And =>
Predefined :=
Iir_Predefined_Ieee_1164_Vector_And_Reduce;
when Name_Or =>
Predefined :=
Iir_Predefined_Ieee_1164_Vector_Or_Reduce;
when Name_Is_X =>
Predefined :=
Iir_Predefined_Ieee_1164_Scalar_Is_X;
when others =>
Predefined := Iir_Predefined_None;
end case;
else
Predefined := Iir_Predefined_None;
end if;
end case;
Set_Implicit_Definition (Decl, Predefined);
end if;
end loop;
exception
when Error =>
Error_Msg_Sem (+Pkg, "package ieee.std_logic_1164 is ill-formed");
-- 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;
Std_Ulogic_0 := Null_Iir;
Std_Ulogic_1 := Null_Iir;
end Extract_Declarations;
end Vhdl.Ieee.Std_Logic_1164;
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