1 files changed, 124 insertions, 0 deletions
diff --git a/src/vhdl/vhdl-ieee-std_logic_unsigned.adb b/src/vhdl/vhdl-ieee-std_logic_unsigned.adb
new file mode 100644
index 000000000..643c75ddd
--- /dev/null
+++ b/src/vhdl/vhdl-ieee-std_logic_unsigned.adb
@@ -0,0 +1,124 @@
+--  Nodes recognizer for ieee.numeric_std and ieee.numeric_bit.
+--  Copyright (C) 2016 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;
+
+package body Vhdl.Ieee.Std_Logic_Unsigned is
+   type Arg_Kind is (Arg_Slv, Arg_Int, Arg_Sl);
+   type Args_Kind is (Arg_Slv_Slv, Arg_Slv_Int, Arg_Int_Slv,
+                      Arg_Slv_Sl, Arg_Sl_Slv);
+
+   type Binary_Pattern_Type is array (Args_Kind) of Iir_Predefined_Functions;
+
+   Eq_Patterns : constant Binary_Pattern_Type :=
+     (Arg_Slv_Slv => Iir_Predefined_Ieee_Std_Logic_Unsigned_Eq_Slv_Slv,
+      Arg_Slv_Int => Iir_Predefined_Ieee_Std_Logic_Unsigned_Eq_Slv_Int,
+      Arg_Int_Slv => Iir_Predefined_Ieee_Std_Logic_Unsigned_Eq_Int_Slv,
+      others => Iir_Predefined_None);
+
+   Error : exception;
+
+   procedure Extract_Declarations (Pkg : Iir_Package_Declaration)
+   is
+      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 then
+            Kind := Arg_Int;
+         elsif Arg_Type = Ieee.Std_Logic_1164.Std_Logic_Type then
+            Kind := Arg_Sl;
+         elsif Arg_Type = Ieee.Std_Logic_1164.Std_Logic_Vector_Type then
+            Kind := Arg_Slv;
+         else
+            raise Error;
+         end if;
+      end Classify_Arg;
+
+      Decl : Iir;
+
+      Arg1, Arg2 : Iir;
+      Arg1_Kind, Arg2_Kind : Arg_Kind;
+
+      procedure Handle_Binary (Pats : Binary_Pattern_Type)
+      is
+         Kind : Args_Kind;
+      begin
+         case Arg1_Kind is
+            when Arg_Slv =>
+               case Arg2_Kind is
+                  when Arg_Slv => Kind := Arg_Slv_Slv;
+                  when Arg_Sl => Kind := Arg_Slv_Sl;
+                  when Arg_Int => Kind := Arg_Slv_Int;
+               end case;
+            when Arg_Int =>
+               case Arg2_Kind is
+                  when Arg_Slv => Kind := Arg_Int_Slv;
+                  when Arg_Sl
+                    | Arg_Int => raise Error;
+               end case;
+            when Arg_Sl =>
+               case Arg2_Kind is
+                  when Arg_Slv => Kind := Arg_Sl_Slv;
+                  when Arg_Sl
+                    | Arg_Int => raise Error;
+               end case;
+         end case;
+
+         Set_Implicit_Definition (Decl, Pats (Kind));
+      end Handle_Binary;
+   begin
+      Decl := Get_Declaration_Chain (Pkg);
+
+      --  Handle functions.
+      while Is_Valid (Decl) loop
+         if Get_Kind (Decl) /= Iir_Kind_Function_Declaration then
+            raise Error;
+         end if;
+
+         Arg1 := Get_Interface_Declaration_Chain (Decl);
+         if Is_Null (Arg1) then
+            raise Error;
+         end if;
+
+         Classify_Arg (Arg1, Arg1_Kind);
+         Arg2 := Get_Chain (Arg1);
+         if Is_Valid (Arg2) then
+            --  Dyadic function.
+            Classify_Arg (Arg2, Arg2_Kind);
+
+            case Get_Identifier (Decl) is
+               when Name_Op_Equality =>
+                  Handle_Binary (Eq_Patterns);
+               when others =>
+                  null;
+            end case;
+         else
+            --  Monadic function.
+            case Get_Identifier (Decl) is
+               when others =>
+                  null;
+            end case;
+         end if;
+         Decl := Get_Chain (Decl);
+      end loop;
+   end Extract_Declarations;
+
+end Vhdl.Ieee.Std_Logic_Unsigned;