os/hal/boards/simulator/board.h


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/*
    ChibiOS - Copyright (C) 2006..2015 Giovanni Di Sirio

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

        http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
*/

#ifndef _BOARD_H_
#define _BOARD_H_

#if !defined(_FROM_ASM_)
#ifdef __cplusplus
extern "C" {
#endif
  void boardInit(void);
#ifdef __cplusplus
}
#endif
#endif /* _FROM_ASM_ */

#endif /* _BOARD_H_ */
--  Values in 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 Ada.Unchecked_Conversion;
with System;
with Mutils; use Mutils;

with Netlists.Utils;

package body Synth.Values is
   function To_Bound_Array_Acc is new Ada.Unchecked_Conversion
     (System.Address, Bound_Array_Acc);

   function To_Rec_El_Array_Acc is new Ada.Unchecked_Conversion
     (System.Address, Rec_El_Array_Acc);

   function To_Type_Acc is new Ada.Unchecked_Conversion
     (System.Address, Type_Acc);

   function To_Value_Acc is new Ada.Unchecked_Conversion
     (System.Address, Value_Acc);
   function To_Value_Array_Acc is new Ada.Unchecked_Conversion
     (System.Address, Values.Value_Array_Acc);

   function Is_Static (Val : Value_Acc) return Boolean is
   begin
      case Val.Kind is
         when Value_Discrete
           | Value_Float =>
            return True;
         when Value_Net
           | Value_Wire =>
            return False;
         when Value_Const_Array
           | Value_Const_Record =>
            return True;
         when Value_Array
           | Value_Record =>
            return False;
         when Value_Access
           | Value_File =>
            return True;
         when Value_Alias =>
            return Is_Static (Val.A_Obj);
         when Value_Const =>
            return True;
         when Value_Instance
           | Value_Subtype =>
            --  Not really a value.
            raise Internal_Error;
      end case;
   end Is_Static;

   function Is_Static_Val (Val : Value_Acc) return Boolean is
   begin
      case Val.Kind is
         when Value_Discrete
           | Value_Float =>
            return True;
         when Value_Net =>
            return Netlists.Utils.Is_Const_Net (Val.N);
         when Value_Wire =>
            return Is_Const_Wire (Val.W);
         when Value_Const_Array
           | Value_Const_Record =>
            return True;
         when Value_Array
           | Value_Record =>
            return False;
         when Value_Access
           | Value_File =>
            return True;
         when Value_Const =>
            return True;
         when Value_Alias =>
            return Is_Static_Val (Val.A_Obj);
         when Value_Instance
           | Value_Subtype =>
            --  Not really a value.
            raise Internal_Error;
      end case;
   end Is_Static_Val;

   function Is_Bounded_Type (Typ : Type_Acc) return Boolean is
   begin
      case Typ.Kind is
         when Type_Bit
           | Type_Logic
           | Type_Discrete
           | Type_Float
           | Type_Vector
           | Type_Slice
           | Type_Array
           | Type_Record
           | Type_Access
           | Type_File =>
            return True;
         when Type_Unbounded_Array
           | Type_Unbounded_Vector =>
            return False;
      end case;
   end Is_Bounded_Type;

   function Strip_Alias_Const (V : Value_Acc) return Value_Acc
   is
      Res : Value_Acc;
   begin
      Res := V;
      loop
         case Res.Kind is
            when Value_Const =>
               Res := Res.C_Val;
            when Value_Alias =>
               if Res.A_Off /= 0 then
                  raise Internal_Error;
               end if;
               Res := Res.A_Obj;
            when others =>
               return Res;
         end case;
      end loop;
   end Strip_Alias_Const;

   function Is_Equal (L, R : Value_Acc) return Boolean
   is
      L1 : constant Value_Acc := Strip_Alias_Const (L);
      R1 : constant Value_Acc := Strip_Alias_Const (R);
   begin
      pragma Unreferenced (L, R);
      if L1.Kind /= R1.Kind then
         return False;
      end if;
      if L1 = R1 then
         return True;
      end if;

      case L1.Kind is
         when Value_Discrete =>
            return L1.Scal = R1.Scal;
         when Value_Float =>
            return L1.Fp = R1.Fp;
         when Value_Const_Array =>
            if L1.Arr.Len /= R1.Arr.Len then
               return False;
            end if;
            for I in L1.Arr.V'Range loop
               if not Is_Equal (L1.Arr.V (I), R1.Arr.V (I)) then
                  return False;
               end if;
            end loop;
            return True;
         when Value_Const =>
            raise Internal_Error;
         when others =>
            --  TODO.
            raise Internal_Error;
      end case;
   end Is_Equal;

   function Are_Types_Equal (L, R : Type_Acc) return Boolean is
   begin
      if L.Kind /= R.Kind
        or else L.W /= R.W
      then
         return False;
      end if;
      if L = R then
         return True;
      end if;

      case L.Kind is
         when Type_Bit
           | Type_Logic =>
            return True;
         when Type_Discrete =>
            return L.Drange = R.Drange;
         when Type_Float =>
            return L.Frange = R.Frange;
         when Type_Vector =>
            return L.Vbound = R.Vbound
              and then Are_Types_Equal (L.Vec_El, R.Vec_El);
         when Type_Unbounded_Vector =>
            return Are_Types_Equal (L.Uvec_El, R.Uvec_El);
         when Type_Slice =>
            return Are_Types_Equal (L.Slice_El, R.Slice_El);
         when Type_Array =>
            if L.Abounds.Len /= R.Abounds.Len then
               return False;
            end if;
            for I in L.Abounds.D'Range loop
               if L.Abounds.D (I) /= R.Abounds.D (I) then
                  return False;
               end if;
            end loop;
            return Are_Types_Equal (L.Arr_El, R.Arr_El);
         when Type_Unbounded_Array =>
            return L.Uarr_Ndim = R.Uarr_Ndim
              and then Are_Types_Equal (L.Uarr_El, R.Uarr_El);
         when Type_Record =>
            if L.Rec.Len /= R.Rec.Len then
               return False;
            end if;
            for I in L.Rec.E'Range loop
               if not Are_Types_Equal (L.Rec.E (I).Typ, R.Rec.E (I).Typ) then
                  return False;
               end if;
            end loop;
            return True;
         when Type_Access =>
            return Are_Types_Equal (L.Acc_Acc, R.Acc_Acc);
         when Type_File =>
            return Are_Types_Equal (L.File_Typ, R.File_Typ);
      end case;
   end Are_Types_Equal;

   function Discrete_Range_Width (Rng : Discrete_Range_Type) return Width
   is
      Lo, Hi : Int64;
      W : Width;
   begin
      case Rng.Dir is
         when Iir_To =>
            Lo := Rng.Left;
            Hi := Rng.Right;
         when Iir_Downto =>
            Lo := Rng.Right;
            Hi := Rng.Left;
      end case;
      if Lo > Hi then
         --  Null range.
         W := 0;
      elsif Lo >= 0 then
         --  Positive.
         W := Width (Clog2 (Uns64 (Hi) + 1));
      elsif Lo = Int64'First then
         --  Handle possible overflow.
         W := 64;
      elsif Hi < 0 then
         --  Negative only.
         W := Width (Clog2 (Uns64 (-Lo))) + 1;
      else
         declare
            Wl : constant Width := Width (Clog2 (Uns64 (-Lo)));
            Wh : constant Width := Width (Clog2 (Uns64 (Hi)));
         begin
            W := Width'Max (Wl, Wh) + 1;
         end;
      end if;
      return W;
   end Discrete_Range_Width;

   function Create_Bit_Type return Type_Acc
   is
      subtype Bit_Type_Type is Type_Type (Type_Bit);
      function Alloc is new Areapools.Alloc_On_Pool_Addr (Bit_Type_Type);
   begin
      return To_Type_Acc (Alloc (Current_Pool, (Kind => Type_Bit,
                                                Is_Synth => True,
                                                W => 1)));
   end Create_Bit_Type;

   function Create_Logic_Type return Type_Acc
   is
      subtype Logic_Type_Type is Type_Type (Type_Logic);
      function Alloc is new Areapools.Alloc_On_Pool_Addr (Logic_Type_Type);
   begin
      return To_Type_Acc (Alloc (Current_Pool, (Kind => Type_Logic,
                                                Is_Synth => True,
                                                W => 1)));
   end Create_Logic_Type;

   function Create_Discrete_Type (Rng : Discrete_Range_Type; W : Width)
                                 return Type_Acc
   is
      subtype Discrete_Type_Type is Type_Type (Type_Discrete);
      function Alloc is new Areapools.Alloc_On_Pool_Addr (Discrete_Type_Type);
   begin
      return To_Type_Acc (Alloc (Current_Pool, (Kind => Type_Discrete,
                                                Is_Synth => True,
                                                W => W,
                                                Drange => Rng)));
   end Create_Discrete_Type;

   function Create_Float_Type (Rng : Float_Range_Type) return Type_Acc
   is
      subtype Float_Type_Type is Type_Type (Type_Float);
      function Alloc is new Areapools.Alloc_On_Pool_Addr (Float_Type_Type);
   begin
      return To_Type_Acc (Alloc (Current_Pool, (Kind => Type_Float,
                                                Is_Synth => True,
                                                W => 64,
                                                Frange => Rng)));
   end Create_Float_Type;

   function Create_Vector_Type (Bnd : Bound_Type; El_Type : Type_Acc)
                               return Type_Acc
   is
      subtype Vector_Type_Type is Type_Type (Type_Vector);
      function Alloc is new Areapools.Alloc_On_Pool_Addr (Vector_Type_Type);
   begin
      return To_Type_Acc (Alloc (Current_Pool, (Kind => Type_Vector,
                                                Is_Synth => True,
                                                W => Bnd.Len,
                                                Vbound => Bnd,
                                                Vec_El => El_Type)));
   end Create_Vector_Type;

   function Create_Slice_Type (W : Width; El_Type : Type_Acc) return Type_Acc
   is
      subtype Slice_Type_Type is Type_Type (Type_Slice);
      function Alloc is new Areapools.Alloc_On_Pool_Addr (Slice_Type_Type);
   begin
      return To_Type_Acc (Alloc (Current_Pool, (Kind => Type_Slice,
                                                Is_Synth => El_Type.Is_Synth,
                                                W => W,
                                                Slice_El => El_Type)));
   end Create_Slice_Type;

   function Create_Vec_Type_By_Length (Len : Width; El : Type_Acc)
                                      return Type_Acc is
   begin
      return Create_Vector_Type ((Dir => Iir_Downto,
                                  Left => Int32 (Len) - 1,
                                  Right => 0,
                                  Len => Len),
                                 El);
   end Create_Vec_Type_By_Length;

   function Create_Bound_Array (Ndims : Iir_Index32) return Bound_Array_Acc
   is
      use System;
      subtype Data_Type is Bound_Array (Ndims);
      Res : Address;
   begin
      --  Manually allocate the array to handle large arrays without
      --  creating a large temporary value.
      Areapools.Allocate
        (Current_Pool.all, Res,
         Data_Type'Size / Storage_Unit, Data_Type'Alignment);

      declare
         --  Discard the warnings for no pragma Import as we really want
         --  to use the default initialization.
         pragma Warnings (Off);
         Addr1 : constant Address := Res;
         Init : Data_Type;
         for Init'Address use Addr1;
         pragma Warnings (On);
      begin
         null;
      end;

      return To_Bound_Array_Acc (Res);
   end Create_Bound_Array;

   function Create_Array_Type (Bnd : Bound_Array_Acc; El_Type : Type_Acc)
                              return Type_Acc
   is
      subtype Array_Type_Type is Type_Type (Type_Array);
      function Alloc is new Areapools.Alloc_On_Pool_Addr (Array_Type_Type);
      W : Width;
   begin
      W := El_Type.W;
      for I in Bnd.D'Range loop
         W := W * Bnd.D (I).Len;
      end loop;
      return To_Type_Acc (Alloc (Current_Pool, (Kind => Type_Array,
                                                Is_Synth => El_Type.Is_Synth,
                                                W => W,
                                                Abounds => Bnd,
                                                Arr_El => El_Type)));
   end Create_Array_Type;

   function Create_Unbounded_Array (Ndim : Iir_Index32; El_Type : Type_Acc)
                                   return Type_Acc
   is
      subtype Unbounded_Type_Type is Type_Type (Type_Unbounded_Array);
      function Alloc is new Areapools.Alloc_On_Pool_Addr (Unbounded_Type_Type);
   begin
      return To_Type_Acc (Alloc (Current_Pool, (Kind => Type_Unbounded_Array,
                                                Is_Synth => El_Type.Is_Synth,
                                                W => 0,
                                                Uarr_Ndim => Ndim,
                                                Uarr_El => El_Type)));
   end Create_Unbounded_Array;

   function Create_Unbounded_Vector (El_Type : Type_Acc) return Type_Acc
   is
      subtype Unbounded_Type_Type is Type_Type (Type_Unbounded_Vector);
      function Alloc is new Areapools.Alloc_On_Pool_Addr (Unbounded_Type_Type);
   begin
      return To_Type_Acc (Alloc (Current_Pool, (Kind => Type_Unbounded_Vector,
                                                Is_Synth => El_Type.Is_Synth,
                                                W => 0,
                                                Uvec_El => El_Type)));
   end Create_Unbounded_Vector;

   function Get_Array_Element (Arr_Type : Type_Acc) return Type_Acc is
   begin
      case Arr_Type.Kind is
         when Type_Vector =>
            return Arr_Type.Vec_El;
         when Type_Array =>
            return Arr_Type.Arr_El;
         when Type_Unbounded_Array =>
            return Arr_Type.Uarr_El;
         when Type_Unbounded_Vector =>
            return Arr_Type.Uvec_El;
         when others =>
            raise Internal_Error;
      end case;
   end Get_Array_Element;

   function Get_Array_Bound (Typ : Type_Acc; Dim : Dim_Type)
                            return Bound_Type is
   begin
      case Typ.Kind is
         when Type_Vector =>
            if Dim /= 1 then
               raise Internal_Error;
            end if;
            return Typ.Vbound;
         when Type_Array =>
            return Typ.Abounds.D (Iir_Index32 (Dim));
         when others =>
            raise Internal_Error;
      end case;
   end Get_Array_Bound;

   function Create_Rec_El_Array (Nels : Iir_Index32) return Rec_El_Array_Acc
   is
      use System;
      subtype Data_Type is Rec_El_Array (Nels);
      Res : Address;
   begin
      --  Manually allocate the array to handle large arrays without
      --  creating a large temporary value.
      Areapools.Allocate
        (Current_Pool.all, Res,
         Data_Type'Size / Storage_Unit, Data_Type'Alignment);

      declare
         --  Discard the warnings for no pragma Import as we really want
         --  to use the default initialization.
         pragma Warnings (Off);
         Addr1 : constant Address := Res;
         Init : Data_Type;
         for Init'Address use Addr1;
         pragma Warnings (On);
      begin
         null;
      end;

      return To_Rec_El_Array_Acc (Res);
   end Create_Rec_El_Array;

   function Create_Record_Type (Els : Rec_El_Array_Acc; W : Width)
                               return Type_Acc
   is
      subtype Record_Type_Type is Type_Type (Type_Record);
      function Alloc is new Areapools.Alloc_On_Pool_Addr (Record_Type_Type);
      Is_Synth : Boolean;
   begin
      Is_Synth := True;
      for I in Els.E'Range loop
         if not Els.E (I).Typ.Is_Synth then
            Is_Synth := False;
            exit;
         end if;
      end loop;
      return To_Type_Acc (Alloc (Current_Pool, (Kind => Type_Record,
                                                Is_Synth => Is_Synth,
                                                W => W,
                                                Rec => Els)));
   end Create_Record_Type;

   function Create_Access_Type (Acc_Type : Type_Acc) return Type_Acc
   is
      subtype Access_Type_Type is Type_Type (Type_Access);
      function Alloc is new Areapools.Alloc_On_Pool_Addr (Access_Type_Type);
   begin
      return To_Type_Acc (Alloc (Current_Pool, (Kind => Type_Access,
                                                Is_Synth => False,
                                                W => 32,
                                                Acc_Acc => Acc_Type)));
   end Create_Access_Type;

   function Create_File_Type (File_Type : Type_Acc) return Type_Acc
   is
      subtype File_Type_Type is Type_Type (Type_File);
      function Alloc is new Areapools.Alloc_On_Pool_Addr (File_Type_Type);
   begin
      return To_Type_Acc (Alloc (Current_Pool, (Kind => Type_File,
                                                Is_Synth => False,
                                                W => 32,
                                                File_Typ => File_Type)));
   end Create_File_Type;

   function Create_Value_Wire (W : Wire_Id; Wtype : Type_Acc) return Value_Acc
   is
      subtype Value_Type_Wire is Value_Type (Values.Value_Wire);
      function Alloc is new Areapools.Alloc_On_Pool_Addr (Value_Type_Wire);
   begin
      pragma Assert (Wtype /= null);
      return To_Value_Acc (Alloc (Current_Pool,
                                  (Kind => Value_Wire,
                                   W => W,
                                   Typ => Wtype)));
   end Create_Value_Wire;

   function Create_Value_Net (N : Net; Ntype : Type_Acc) return Value_Acc
   is
      subtype Value_Type_Net is Value_Type (Value_Net);
      function Alloc is new Areapools.Alloc_On_Pool_Addr (Value_Type_Net);
   begin
      pragma Assert (Ntype /= null);
      return To_Value_Acc
        (Alloc (Current_Pool,
                Value_Type_Net'(Kind => Value_Net, N => N, Typ => Ntype)));
   end Create_Value_Net;

   function Create_Value_Discrete (Val : Int64; Vtype : Type_Acc)
                                  return Value_Acc
   is
      subtype Value_Type_Discrete is Value_Type (Value_Discrete);
      function Alloc is new Areapools.Alloc_On_Pool_Addr (Value_Type_Discrete);
   begin
      pragma Assert (Vtype /= null);
      return To_Value_Acc (Alloc (Current_Pool,
                                  (Kind => Value_Discrete, Scal => Val,
                                   Typ => Vtype)));
   end Create_Value_Discrete;

   function Create_Value_Float (Val : Fp64; Vtype : Type_Acc) return Value_Acc
   is
      subtype Value_Type_Float is Value_Type (Value_Float);
      function Alloc is new Areapools.Alloc_On_Pool_Addr (Value_Type_Float);
   begin
      pragma Assert (Vtype /= null);
      return To_Value_Acc (Alloc (Current_Pool,
                                  (Kind => Value_Float,
                                   Typ => Vtype,
                                   Fp => Val)));
   end Create_Value_Float;

   function Create_Value_Access (Vtype : Type_Acc; Acc : Heap_Index)
                                return Value_Acc
   is
      subtype Value_Type_Access is Value_Type (Value_Access);
      function Alloc is new Areapools.Alloc_On_Pool_Addr (Value_Type_Access);
   begin
      pragma Assert (Vtype /= null);
      return To_Value_Acc (Alloc (Current_Pool,
                                  (Kind => Value_Access,
                                   Typ => Vtype,
                                   Acc => Acc)));
   end Create_Value_Access;

   function Create_Value_File (Vtype : Type_Acc; File : File_Index)
                              return Value_Acc
   is
      subtype Value_Type_File is Value_Type (Value_File);
      function Alloc is new Areapools.Alloc_On_Pool_Addr (Value_Type_File);
   begin
      pragma Assert (Vtype /= null);
      return To_Value_Acc (Alloc (Current_Pool,
                                  (Kind => Value_File,
                                   Typ => Vtype,
                                   File => File)));
   end Create_Value_File;

   function Create_Value_Array (Len : Iir_Index32) return Value_Array_Acc
   is
      use System;
      subtype Data_Type is Values.Value_Array_Type (Len);
      Res : Address;
   begin
      --  Manually allocate the array to handle large arrays without
      --  creating a large temporary value.
      Areapools.Allocate
        (Current_Pool.all, Res,
         Data_Type'Size / Storage_Unit, Data_Type'Alignment);

      declare
         --  Discard the warnings for no pragma Import as we really want
         --  to use the default initialization.
         pragma Warnings (Off);
         Addr1 : constant Address := Res;
         Init : Data_Type;
         for Init'Address use Addr1;
         pragma Warnings (On);
      begin
         null;
      end;

      return To_Value_Array_Acc (Res);
   end Create_Value_Array;

   function Create_Value_Array (Bounds : Type_Acc; Arr : Value_Array_Acc)
                               return Value_Acc
   is
      subtype Value_Type_Array is Value_Type (Value_Array);
      function Alloc is new Areapools.Alloc_On_Pool_Addr (Value_Type_Array);

      Res : Value_Acc;
   begin
      pragma Assert (Bounds /= null);
      Res := To_Value_Acc (Alloc (Current_Pool,
                                  (Kind => Value_Array,
                                   Arr => Arr, Typ => Bounds)));
      return Res;
   end Create_Value_Array;

   function Create_Value_Const_Array (Bounds : Type_Acc; Arr : Value_Array_Acc)
                               return Value_Acc
   is
      subtype Value_Type_Const_Array is Value_Type (Value_Const_Array);
      function Alloc is
         new Areapools.Alloc_On_Pool_Addr (Value_Type_Const_Array);

      Res : Value_Acc;
   begin
      pragma Assert (Bounds /= null);
      Res := To_Value_Acc (Alloc (Current_Pool,
                                  (Kind => Value_Const_Array,
                                   Arr => Arr, Typ => Bounds)));
      return Res;
   end Create_Value_Const_Array;

   function Get_Array_Flat_Length (Typ : Type_Acc) return Width is
   begin
      case Typ.Kind is
         when Type_Vector =>
            return Typ.Vbound.Len;
         when Type_Array =>
            declare
               Len : Width;
            begin
               Len := 1;
               for I in Typ.Abounds.D'Range loop
                  Len := Len * Typ.Abounds.D (I).Len;
               end loop;
               return Len;
            end;
         when others =>
            raise Internal_Error;
      end case;
   end Get_Array_Flat_Length;

   procedure Create_Array_Data (Arr : Value_Acc)
   is
      Len : Width;
   begin
      case Arr.Typ.Kind is
         when Type_Array =>
            Len := Get_Array_Flat_Length (Arr.Typ);
         when Type_Vector =>
            Len := Arr.Typ.Vbound.Len;
         when others =>
            raise Internal_Error;
      end case;

      Arr.Arr := Create_Value_Array (Iir_Index32 (Len));
   end Create_Array_Data;

   function Create_Value_Array (Bounds : Type_Acc) return Value_Acc
   is
      Res : Value_Acc;
   begin
      Res := Create_Value_Array (Bounds, null);
      Create_Array_Data (Res);
      return Res;
   end Create_Value_Array;

   function Create_Value_Record (Typ : Type_Acc; Els : Value_Array_Acc)
                                return Value_Acc
   is
      subtype Value_Type_Record is Value_Type (Value_Record);
      function Alloc is new Areapools.Alloc_On_Pool_Addr (Value_Type_Record);
   begin
      return To_Value_Acc (Alloc (Current_Pool,
                                  (Kind => Value_Record,
                                   Typ => Typ,
                                   Rec => Els)));
   end Create_Value_Record;

   function Create_Value_Const_Record (Typ : Type_Acc; Els : Value_Array_Acc)
                                      return Value_Acc
   is
      subtype Value_Type_Const_Record is Value_Type (Value_Const_Record);
      function Alloc is
         new Areapools.Alloc_On_Pool_Addr (Value_Type_Const_Record);
   begin
      return To_Value_Acc (Alloc (Current_Pool,
                                  (Kind => Value_Const_Record,
                                   Typ => Typ,
                                   Rec => Els)));
   end Create_Value_Const_Record;

   function Create_Value_Instance (Inst : Instance_Id) return Value_Acc
   is
      subtype Value_Type_Instance is Value_Type (Value_Instance);
      function Alloc is new Areapools.Alloc_On_Pool_Addr (Value_Type_Instance);
   begin
      return To_Value_Acc
        (Alloc (Current_Pool,
                (Kind => Value_Instance, Instance => Inst, Typ => null)));
   end Create_Value_Instance;

   function Create_Value_Subtype (Typ : Type_Acc) return Value_Acc
   is
      subtype Value_Type_Subtype is Value_Type (Value_Subtype);
      function Alloc is new Areapools.Alloc_On_Pool_Addr (Value_Type_Subtype);
   begin
      return To_Value_Acc (Alloc (Current_Pool,
                                  (Kind => Value_Subtype, Typ => Typ)));
   end Create_Value_Subtype;

   function Create_Value_Alias (Obj : Value_Acc; Off : Uns32; Typ : Type_Acc)
                               return Value_Acc
   is
      subtype Value_Type_Alias is Value_Type (Value_Alias);
      function Alloc is new Areapools.Alloc_On_Pool_Addr (Value_Type_Alias);
   begin
      return To_Value_Acc (Alloc (Current_Pool,
                                  (Kind => Value_Alias,
                                   A_Obj => Obj,
                                   A_Off => Off,
                                   Typ => Typ)));
   end Create_Value_Alias;

   function Create_Value_Const (Val : Value_Acc; Loc : Syn_Src)
                               return Value_Acc
   is
      subtype Value_Type_Const is Value_Type (Value_Const);
      function Alloc is new Areapools.Alloc_On_Pool_Addr (Value_Type_Const);
   begin
      pragma Assert (Val = null or else Val.Kind /= Value_Const);
      return To_Value_Acc (Alloc (Current_Pool,
                                  (Kind => Value_Const,
                                   C_Val => Val,
                                   C_Loc => Loc,
                                   C_Net => No_Net,
                                   Typ => Val.Typ)));
   end Create_Value_Const;

   procedure Strip_Const (Val : in out Value_Acc) is
   begin
      if Val.Kind = Value_Const then
         Val := Val.C_Val;
      end if;
   end Strip_Const;

   function Strip_Const (Val : Value_Acc) return Value_Acc is
   begin
      if Val.Kind = Value_Const then
         return Val.C_Val;
      else
         return Val;
      end if;
   end Strip_Const;

   function Copy (Src : Value_Acc) return Value_Acc;

   function Copy_Array (Arr : Value_Array_Acc) return Value_Array_Acc
   is
      Res : Value_Array_Acc;
   begin
      Res := Create_Value_Array (Arr.Len);
      for I in Res.V'Range loop
         Res.V (I) := Copy (Arr.V (I));
      end loop;
      return Res;
   end Copy_Array;

   function Copy (Src : Value_Acc) return Value_Acc
   is
      Res : Value_Acc;
      Arr : Value_Array_Acc;
   begin
      case Src.Kind is
         when Value_Net =>
            Res := Create_Value_Net (Src.N, Src.Typ);
         when Value_Wire =>
            Res := Create_Value_Wire (Src.W, Src.Typ);
         when Value_Discrete =>
            Res := Create_Value_Discrete (Src.Scal, Src.Typ);
         when Value_Float =>
            Res := Create_Value_Float (Src.Fp, Src.Typ);
         when Value_Subtype =>
            Res := Create_Value_Subtype (Src.Typ);
         when Value_Array =>
            Arr := Copy_Array (Src.Arr);
            Res := Create_Value_Array (Src.Typ, Arr);
         when Value_Const_Array =>
            Arr := Copy_Array (Src.Arr);
            Res := Create_Value_Const_Array (Src.Typ, Arr);
         when Value_Record =>
            Arr := Copy_Array (Src.Rec);
            Res := Create_Value_Record (Src.Typ, Arr);
         when Value_Const_Record =>
            Arr := Copy_Array (Src.Rec);
            Res := Create_Value_Const_Record (Src.Typ, Arr);
         when Value_Access =>
            Res := Create_Value_Access (Src.Typ, Src.Acc);
         when Value_File =>
            Res := Create_Value_File (Src.Typ, Src.File);
         when Value_Instance =>
            raise Internal_Error;
         when Value_Const =>
            raise Internal_Error;
         when Value_Alias =>
            raise Internal_Error;
      end case;
      return Res;
   end Copy;

   function Unshare (Src : Value_Acc; Pool : Areapool_Acc)
                    return Value_Acc
   is
      Prev_Pool : constant Areapool_Acc := Current_Pool;
      Res : Value_Acc;
   begin
      Current_Pool := Pool;
      Res := Copy (Src);
      Current_Pool := Prev_Pool;
      return Res;
   end Unshare;

   function Get_Type_Width (Atype : Type_Acc) return Width is
   begin
      pragma Assert (Atype.Kind /= Type_Unbounded_Array);
      return Atype.W;
   end Get_Type_Width;

   function Get_Bound_Length (T : Type_Acc; Dim : Iir_Index32) return Width is
   begin
      case T.Kind is
         when Type_Vector =>
            if Dim /= 1 then
               raise Internal_Error;
            end if;
            return T.Vbound.Len;
         when Type_Slice =>
            if Dim /= 1 then
               raise Internal_Error;
            end if;
            return T.W;
         when Type_Array =>
            return T.Abounds.D (Dim).Len;
         when others =>
            raise Internal_Error;
      end case;
   end Get_Bound_Length;

   function Is_Matching_Bounds (L, R : Type_Acc) return Boolean is
   begin
      case L.Kind is
         when Type_Bit
           | Type_Logic
           | Type_Discrete
           | Type_Float =>
            pragma Assert (L.Kind = R.Kind);
            return True;
         when Type_Vector
           | Type_Slice =>
            return Get_Bound_Length (L, 1) = Get_Bound_Length (R, 1);
         when Type_Array =>
            for I in L.Abounds.D'Range loop
               if Get_Bound_Length (L, I) /= Get_Bound_Length (R, I) then
                  return False;
               end if;
            end loop;
            return True;
         when Type_Unbounded_Array
           | Type_Unbounded_Vector =>
            raise Internal_Error;
         when Type_Record =>
            --  FIXME: handle vhdl-08
            return True;
         when Type_Access =>
            return True;
         when Type_File =>
            raise Internal_Error;
      end case;
   end Is_Matching_Bounds;

   function Create_Value_Default (Typ : Type_Acc) return Value_Acc is
   begin
      case Typ.Kind is
         when Type_Bit
           | Type_Logic =>
            --  FIXME: what about subtype ?
            return Create_Value_Discrete (0, Typ);
         when Type_Discrete =>
            return Create_Value_Discrete (Typ.Drange.Left, Typ);
         when Type_Float =>
            return Create_Value_Float (Typ.Frange.Left, Typ);
         when Type_Vector =>
            declare
               El_Typ : constant Type_Acc := Typ.Vec_El;
               Arr : Value_Array_Acc;
            begin
               Arr := Create_Value_Array (Iir_Index32 (Typ.Vbound.Len));
               for I in Arr.V'Range loop
                  Arr.V (I) := Create_Value_Default (El_Typ);
               end loop;
               return Create_Value_Const_Array (Typ, Arr);
            end;
         when Type_Unbounded_Vector =>
            raise Internal_Error;
         when Type_Slice =>
            raise Internal_Error;
         when Type_Array =>
            declare
               El_Typ : constant Type_Acc := Get_Array_Element (Typ);
               Arr : Value_Array_Acc;
            begin
               Arr := Create_Value_Array
                 (Iir_Index32 (Get_Array_Flat_Length (Typ)));
               for I in Arr.V'Range loop
                  Arr.V (I) := Create_Value_Default (El_Typ);
               end loop;
               return Create_Value_Const_Array (Typ, Arr);
            end;
         when Type_Unbounded_Array =>
            raise Internal_Error;
         when Type_Record =>
            declare
               Els : Value_Array_Acc;
            begin
               Els := Create_Value_Array (Typ.Rec.Len);
               for I in Els.V'Range loop
                  Els.V (I) := Create_Value_Default (Typ.Rec.E (I).Typ);
               end loop;
               return Create_Value_Const_Record (Typ, Els);
            end;
         when Type_Access =>
            return Create_Value_Access (Typ, Null_Heap_Index);
         when Type_File =>
            raise Internal_Error;
      end case;
   end Create_Value_Default;

   function Value_To_String (Val : Value_Acc) return String
   is
      Str : String (1 .. Natural (Val.Arr.Len));
   begin
      for I in Val.Arr.V'Range loop
         Str (Natural (I)) := Character'Val (Val.Arr.V (I).Scal);
      end loop;
      return Str;
   end Value_To_String;

   procedure Init is
   begin
      Instance_Pool := Global_Pool'Access;
      Boolean_Type := Create_Bit_Type;
      Logic_Type := Create_Logic_Type;
      Bit_Type := Create_Bit_Type;
   end Init;
end Synth.Values;