1 files changed, 105 insertions, 0 deletions
diff --git a/src/vhdl/vhdl-ieee-numeric_std_unsigned.adb b/src/vhdl/vhdl-ieee-numeric_std_unsigned.adb
new file mode 100644
index 000000000..16450f5a6
--- /dev/null
+++ b/src/vhdl/vhdl-ieee-numeric_std_unsigned.adb
@@ -0,0 +1,105 @@
+--  Nodes recognizer for ieee.std_logic_unsigned and ieee.std_logic_signed
+--  Copyright (C) 2021 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 Vhdl.Std_Package;
+with Std_Names; use Std_Names;
+with Vhdl.Ieee.Std_Logic_1164;
+with Vhdl.Errors;
+
+package body Vhdl.Ieee.Numeric_Std_Unsigned is
+   type Arg_Kind is (Arg_Slv, Arg_Int, Arg_Log);
+
+   Error : exception;
+
+   procedure Classify_Arg (Arg : Iir; Kind : out Arg_Kind)
+   is
+      Arg_Type : constant Iir := Get_Type (Arg);
+   begin
+      if Arg_Type = Vhdl.Std_Package.Integer_Subtype_Definition
+        or else Arg_Type = Vhdl.Std_Package.Natural_Subtype_Definition
+      then
+         Kind := Arg_Int;
+      elsif Arg_Type = Ieee.Std_Logic_1164.Std_Logic_Type
+        or else Arg_Type = Ieee.Std_Logic_1164.Std_Ulogic_Type
+      then
+         Kind := Arg_Log;
+      elsif Arg_Type = Ieee.Std_Logic_1164.Std_Logic_Vector_Type
+        or else Arg_Type = Ieee.Std_Logic_1164.Std_Ulogic_Vector_Type
+      then
+         Kind := Arg_Slv;
+      else
+         raise Error;
+      end if;
+   end Classify_Arg;
+
+   procedure Extract_Declaration (Decl : Iir)
+   is
+      Arg1, Arg2 : Iir;
+      Arg1_Kind  : Arg_Kind;
+      Res : Iir_Predefined_Functions;
+   begin
+      Arg1 := Get_Interface_Declaration_Chain (Decl);
+      if Is_Null (Arg1) then
+         raise Error;
+      end if;
+
+      Res := Iir_Predefined_None;
+
+      Classify_Arg (Arg1, Arg1_Kind);
+      Arg2 := Get_Chain (Arg1);
+      if Is_Valid (Arg2) then
+         --  Dyadic function.
+         null;
+      else
+         --  Monadic function.
+         case Get_Identifier (Decl) is
+            when Name_To_Integer =>
+               pragma Assert (Arg1_Kind = Arg_Slv);
+               Res :=
+                 Iir_Predefined_Ieee_Numeric_Std_Unsigned_To_Integer_Slv_Nat;
+            when others =>
+               null;
+         end case;
+      end if;
+      Set_Implicit_Definition (Decl, Res);
+   end Extract_Declaration;
+
+   procedure Extract_Declarations (Pkg : Iir_Package_Declaration)
+   is
+      Decl : Iir;
+   begin
+      Decl := Get_Declaration_Chain (Pkg);
+
+      Decl := Skip_Copyright_Notice (Decl);
+
+      --  Handle functions.
+      while Is_Valid (Decl) loop
+         case Get_Kind (Decl) is
+            when Iir_Kind_Function_Declaration =>
+               Extract_Declaration (Decl);
+            when Iir_Kind_Non_Object_Alias_Declaration =>
+               null;
+            when others =>
+               Vhdl.Errors.Error_Kind ("extract_declarations", Decl);
+               raise Error;
+         end case;
+
+         Decl := Get_Chain (Decl);
+      end loop;
+   end Extract_Declarations;
+end Vhdl.Ieee.Numeric_Std_Unsigned;