synth: file renaming for decls, expr, insts and stmts.

1 files changed, 0 insertions, 2572 deletions

diff --git a/src/synth/synth-expr.adb b/src/synth/synth-expr.adb
deleted file mode 100644
index d05c0d089..000000000
--- a/src/synth/synth-expr.adb
+++ /dev/null
@@ -1,2572 +0,0 @@
---  Expressions 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, see <gnu.org/licenses>.
-
-with Types_Utils; use Types_Utils;
-with Name_Table;
-with Std_Names;
-with Str_Table;
-with Mutils; use Mutils;
-with Errorout; use Errorout;
-
-with Vhdl.Types;
-with Vhdl.Ieee.Std_Logic_1164; use Vhdl.Ieee.Std_Logic_1164;
-with Vhdl.Std_Package;
-with Vhdl.Errors; use Vhdl.Errors;
-with Vhdl.Utils; use Vhdl.Utils;
-with Vhdl.Evaluation; use Vhdl.Evaluation;
-with Vhdl.Annotations; use Vhdl.Annotations;
-
-with PSL.Nodes;
-with PSL.Errors;
-
-with Netlists.Gates; use Netlists.Gates;
-with Netlists.Folds; use Netlists.Folds;
-with Netlists.Utils; use Netlists.Utils;
-with Netlists.Locations;
-
-with Synth.Memtype; use Synth.Memtype;
-with Synth.Errors; use Synth.Errors;
-with Synth.Vhdl_Environment;
-with Synth.Decls;
-with Synth.Stmts; use Synth.Stmts;
-with Synth.Vhdl_Oper; use Synth.Vhdl_Oper;
-with Synth.Vhdl_Heap; use Synth.Vhdl_Heap;
-with Synth.Debugger;
-with Synth.Vhdl_Aggr;
-
-with Grt.Types;
-with Grt.To_Strings;
-
-package body Synth.Expr is
-   function Synth_Name (Syn_Inst : Synth_Instance_Acc; Name : Node)
-                       return Valtyp;
-
-   procedure Set_Location (N : Net; Loc : Node)
-     renames Synth.Source.Set_Location;
-
-   function Get_Value_Memtyp (V : Valtyp) return Memtyp is
-   begin
-      case V.Val.Kind is
-         when Value_Memory =>
-            return (V.Typ, V.Val.Mem);
-         when Value_Const =>
-            return Get_Memtyp (V);
-         when Value_Wire =>
-            return Synth.Vhdl_Environment.Env.Get_Static_Wire (V.Val.W);
-         when Value_Alias =>
-            declare
-               Res : Memtyp;
-            begin
-               Res := Get_Value_Memtyp ((V.Val.A_Typ, V.Val.A_Obj));
-               return (V.Typ, Res.Mem + V.Val.A_Off.Mem_Off);
-            end;
-         when others =>
-            raise Internal_Error;
-      end case;
-   end Get_Value_Memtyp;
-
-   function Get_Static_Discrete (V : Valtyp) return Int64 is
-   begin
-      case V.Val.Kind is
-         when Value_Memory =>
-            return Read_Discrete (V);
-         when Value_Const =>
-            return Read_Discrete (Get_Memtyp (V));
-         when Value_Wire =>
-            return Read_Discrete
-              (Synth.Vhdl_Environment.Env.Get_Static_Wire (V.Val.W));
-         when others =>
-            raise Internal_Error;
-      end case;
-   end Get_Static_Discrete;
-
-   function Is_Positive (V : Valtyp) return Boolean
-   is
-      N : Net;
-      Inst : Instance;
-   begin
-      pragma Assert (V.Typ.Kind = Type_Discrete);
-      case V.Val.Kind is
-         when Value_Const
-           | Value_Memory =>
-            return Read_Discrete (Get_Memtyp (V)) >= 0;
-         when Value_Net =>
-            N := V.Val.N;
-         when Value_Wire =>
-            if Synth.Vhdl_Environment.Env.Is_Static_Wire (V.Val.W) then
-               return Read_Discrete
-                 (Synth.Vhdl_Environment.Env.Get_Static_Wire (V.Val.W)) >= 0;
-            else
-               return False;
-            end if;
-         when others =>
-            raise Internal_Error;
-      end case;
-      Inst := Get_Net_Parent (N);
-      case Get_Id (Inst) is
-         when Id_Uextend
-           | Id_Const_UB32 =>
-            return True;
-         when others =>
-            --  Be conservative.
-            return False;
-      end case;
-   end Is_Positive;
-
-   procedure From_Std_Logic (Enum : Int64; Val : out Uns32; Zx : out Uns32) is
-   begin
-      case Enum is
-         when Vhdl.Ieee.Std_Logic_1164.Std_Logic_0_Pos
-           |  Vhdl.Ieee.Std_Logic_1164.Std_Logic_L_Pos =>
-            Val := 0;
-            Zx := 0;
-         when Vhdl.Ieee.Std_Logic_1164.Std_Logic_1_Pos
-           |  Vhdl.Ieee.Std_Logic_1164.Std_Logic_H_Pos =>
-            Val := 1;
-            Zx := 0;
-         when Vhdl.Ieee.Std_Logic_1164.Std_Logic_U_Pos
-           |  Vhdl.Ieee.Std_Logic_1164.Std_Logic_X_Pos
-           |  Vhdl.Ieee.Std_Logic_1164.Std_Logic_D_Pos =>
-            Val := 1;
-            Zx := 1;
-         when Vhdl.Ieee.Std_Logic_1164.Std_Logic_Z_Pos
-           |  Vhdl.Ieee.Std_Logic_1164.Std_Logic_W_Pos =>
-            Val := 0;
-            Zx := 1;
-         when others =>
-            --  Only 9 values.
-            raise Internal_Error;
-      end case;
-   end From_Std_Logic;
-
-   procedure From_Bit (Enum : Int64; Val : out Uns32) is
-   begin
-      if Enum = 0 then
-         Val := 0;
-      elsif Enum = 1 then
-         Val := 1;
-      else
-         raise Internal_Error;
-      end if;
-   end From_Bit;
-
-   procedure To_Logic
-     (Enum : Int64; Etype : Type_Acc; Val : out Uns32; Zx : out Uns32) is
-   begin
-      if Etype = Logic_Type then
-         pragma Assert (Etype.Kind = Type_Logic);
-         From_Std_Logic (Enum, Val, Zx);
-      elsif Etype = Boolean_Type or Etype = Bit_Type then
-         pragma Assert (Etype.Kind = Type_Bit);
-         From_Bit (Enum, Val);
-         Zx := 0;
-      else
-         raise Internal_Error;
-      end if;
-   end To_Logic;
-
-   procedure Uns2logvec (Val : Uns64;
-                         W : Width;
-                         Vec : in out Logvec_Array;
-                         Off : in out Uns32) is
-   begin
-      if W = 0 then
-         return;
-      end if;
-
-      for I in 0 .. W - 1 loop
-         declare
-            B : constant Uns32 := Uns32 (Shift_Right (Val, Natural (I)) and 1);
-            Idx : constant Digit_Index := Digit_Index (Off / 32);
-            Pos : constant Natural := Natural (Off mod 32);
-         begin
-            Vec (Idx).Val := Vec (Idx).Val or Shift_Left (B, Pos);
-         end;
-         Off := Off + 1;
-      end loop;
-   end Uns2logvec;
-
-   procedure Bit2logvec (Val : Uns32;
-                         Vec : in out Logvec_Array;
-                         Off : in out Uns32)
-   is
-      pragma Assert (Val <= 1);
-      Idx : constant Digit_Index := Digit_Index (Off / 32);
-      Pos : constant Natural := Natural (Off mod 32);
-      Va : Uns32;
-   begin
-      Va := Shift_Left (Val, Pos);
-      Vec (Idx).Val := Vec (Idx).Val or Va;
-      Vec (Idx).Zx := 0;
-      Off := Off + 1;
-   end Bit2logvec;
-
-   procedure Logic2logvec (Val : Int64;
-                           Vec : in out Logvec_Array;
-                           Off : in out Uns32;
-                           Has_Zx : in out Boolean)
-   is
-      pragma Assert (Val <= 8);
-      Idx : constant Digit_Index := Digit_Index (Off / 32);
-      Pos : constant Natural := Natural (Off mod 32);
-      Va : Uns32;
-      Zx : Uns32;
-   begin
-      From_Std_Logic (Val, Va, Zx);
-      Has_Zx := Has_Zx or Zx /= 0;
-      Va := Shift_Left (Va, Pos);
-      Zx := Shift_Left (Zx, Pos);
-      Vec (Idx).Val := Vec (Idx).Val or Va;
-      Vec (Idx).Zx := Vec (Idx).Zx or Zx;
-      Off := Off + 1;
-   end Logic2logvec;
-
-   procedure Value2logvec (Mem : Memory_Ptr;
-                           Typ : Type_Acc;
-                           Off : in out Uns32;
-                           W : in out Width;
-                           Vec : in out Logvec_Array;
-                           Vec_Off : in out Uns32;
-                           Has_Zx : in out Boolean) is
-   begin
-      if Off >= Typ.W then
-         --  Offset not yet reached.
-         Off := Off - Typ.W;
-         return;
-      end if;
-      if W = 0 then
-         return;
-      end if;
-
-      case Typ.Kind is
-         when Type_Bit =>
-            --  Scalar bits cannot be cut.
-            pragma Assert (Off = 0 and W >= Typ.W);
-            Bit2logvec (Uns32 (Read_U8 (Mem)), Vec, Vec_Off);
-            W := W - Typ.W;
-         when Type_Logic =>
-            --  Scalar bits cannot be cut.
-            pragma Assert (Off = 0 and W >= Typ.W);
-            Logic2logvec (Int64 (Read_U8 (Mem)), Vec, Vec_Off, Has_Zx);
-            W := W - Typ.W;
-         when Type_Discrete =>
-            --  Scalar bits cannot be cut.
-            pragma Assert (Off = 0 and W >= Typ.W);
-            Uns2logvec (To_Uns64 (Read_Discrete (Memtyp'(Typ, Mem))),
-                        Typ.W, Vec, Vec_Off);
-            W := W - Typ.W;
-         when Type_Float =>
-            --  Fp64 is for sure 64 bits.  Assume the endianness of floats is
-            --  the same as integers endianness.
-            --  Scalar bits cannot be cut.
-            pragma Assert (Off = 0 and W >= Typ.W);
-            Uns2logvec (To_Uns64 (Read_Fp64 (Mem)), 64, Vec, Vec_Off);
-            W := W - Typ.W;
-         when Type_Vector =>
-            declare
-               Vlen : Uns32;
-            begin
-               Vlen := Uns32 (Vec_Length (Typ));
-               pragma Assert (Off < Vlen);
-               pragma Assert (Vlen > 0);
-
-               if Vlen > Off + W then
-                  Vlen := Off + W;
-               end if;
-               case Typ.Vec_El.Kind is
-                  when Type_Bit =>
-                     --  TODO: optimize off mod 32 = 0.
-                     for I in reverse Off + 1 .. Vlen loop
-                        Bit2logvec (Uns32 (Read_U8 (Mem + Size_Type (I - 1))),
-                                    Vec, Vec_Off);
-                     end loop;
-                  when Type_Logic =>
-                     for I in reverse Off + 1 .. Vlen loop
-                        Logic2logvec
-                          (Int64 (Read_U8 (Mem + Size_Type (I - 1))),
-                           Vec, Vec_Off, Has_Zx);
-                     end loop;
-                  when others =>
-                     raise Internal_Error;
-               end case;
-               W := W - (Vlen - Off);
-               Off := 0;
-            end;
-         when Type_Array =>
-            declare
-               Alen : constant Iir_Index32 := Get_Array_Flat_Length (Typ);
-               El_Typ : constant Type_Acc := Typ.Arr_El;
-            begin
-               for I in reverse 1 .. Alen loop
-                  Value2logvec (Mem + Size_Type (I - 1) * El_Typ.Sz, El_Typ,
-                                Off, W, Vec, Vec_Off, Has_Zx);
-                  exit when W = 0;
-               end loop;
-            end;
-         when Type_Record =>
-            for I in Typ.Rec.E'Range loop
-               Value2logvec (Mem + Typ.Rec.E (I).Moff, Typ.Rec.E (I).Typ,
-                             Off, W, Vec, Vec_Off, Has_Zx);
-               exit when W = 0;
-            end loop;
-         when others =>
-            raise Internal_Error;
-      end case;
-   end Value2logvec;
-
-   procedure Value2logvec (Val : Memtyp;
-                           Off : Uns32;
-                           W : Width;
-                           Vec : in out Logvec_Array;
-                           Vec_Off : in out Uns32;
-                           Has_Zx : in out Boolean)
-   is
-      Off1 : Uns32;
-      W1 : Width;
-   begin
-      Off1 := Off;
-      W1 := W;
-      Value2logvec (Val.Mem, Val.Typ, Off1, W1, Vec, Vec_Off, Has_Zx);
-      pragma Assert (Off1 = 0);
-      pragma Assert (W1 = 0);
-   end Value2logvec;
-
-   --  Resize for a discrete value.
-   function Synth_Resize
-     (Ctxt : Context_Acc; Val : Valtyp; W : Width; Loc : Node) return Net
-   is
-      Wn : constant Width := Val.Typ.W;
-      N : Net;
-      Res : Net;
-      V : Int64;
-   begin
-      if Is_Static (Val.Val)
-        and then Wn /= W
-      then
-         --  Optimization: resize directly.
-         V := Read_Discrete (Val);
-         if Val.Typ.Drange.Is_Signed then
-            Res := Build2_Const_Int (Ctxt, V, W);
-         else
-            Res := Build2_Const_Uns (Ctxt, To_Uns64 (V), W);
-         end if;
-         Set_Location (Res, Loc);
-         return Res;
-      end if;
-
-      N := Get_Net (Ctxt, Val);
-      if Wn > W then
-         return Build2_Trunc (Ctxt, Id_Utrunc, N, W, Get_Location (Loc));
-      elsif Wn < W then
-         if Val.Typ.Drange.Is_Signed then
-            Res := Build_Extend (Ctxt, Id_Sextend, N, W);
-         else
-            Res := Build_Extend (Ctxt, Id_Uextend, N, W);
-         end if;
-         Set_Location (Res, Loc);
-         return Res;
-      else
-         return N;
-      end if;
-   end Synth_Resize;
-
-   procedure Concat_Array (Ctxt : Context_Acc; Arr : in out Net_Array)
-   is
-      Last : Int32;
-      Idx, New_Idx : Int32;
-   begin
-      Last := Arr'Last;
-      while Last > Arr'First loop
-         Idx := Arr'First;
-         New_Idx := Arr'First - 1;
-         while Idx <= Last loop
-            --  Gather at most 4 nets.
-            New_Idx := New_Idx + 1;
-
-            if Idx = Last then
-               Arr (New_Idx) := Arr (Idx);
-               Idx := Idx + 1;
-            elsif Idx + 1 = Last then
-               Arr (New_Idx) := Build_Concat2
-                 (Ctxt, Arr (Idx), Arr (Idx + 1));
-               Idx := Idx + 2;
-            elsif Idx + 2 = Last then
-               Arr (New_Idx) := Build_Concat3
-                 (Ctxt, Arr (Idx), Arr (Idx + 1), Arr (Idx + 2));
-               Idx := Idx + 3;
-            else
-               Arr (New_Idx) := Build_Concat4
-                 (Ctxt,
-                  Arr (Idx), Arr (Idx + 1), Arr (Idx + 2), Arr (Idx + 3));
-               Idx := Idx + 4;
-            end if;
-         end loop;
-         Last := New_Idx;
-      end loop;
-   end Concat_Array;
-
-   procedure Concat_Array
-     (Ctxt : Context_Acc; Arr : in out Net_Array; N : out Net) is
-   begin
-      Concat_Array (Ctxt, Arr);
-      N := Arr (Arr'First);
-   end Concat_Array;
-
-   function Build_Discrete_Range_Type
-     (L : Int64; R : Int64; Dir : Direction_Type) return Discrete_Range_Type is
-   begin
-      return (Dir => Dir,
-              Left => L,
-              Right => R,
-              Is_Signed => L < 0 or R < 0);
-   end Build_Discrete_Range_Type;
-
-   function Synth_Discrete_Range_Expression
-     (Syn_Inst : Synth_Instance_Acc; Rng : Node) return Discrete_Range_Type
-   is
-      L, R : Valtyp;
-      Lval, Rval : Int64;
-   begin
-      --  Static values.
-      L := Synth_Expression_With_Basetype (Syn_Inst, Get_Left_Limit (Rng));
-      R := Synth_Expression_With_Basetype (Syn_Inst, Get_Right_Limit (Rng));
-      Strip_Const (L);
-      Strip_Const (R);
-
-      if not (Is_Static (L.Val) and Is_Static (R.Val)) then
-         Error_Msg_Synth (+Rng, "limits of range are not constant");
-         Set_Error (Syn_Inst);
-         return (Dir => Get_Direction (Rng),
-                 Left => 0,
-                 Right => 0,
-                 Is_Signed => False);
-      end if;
-
-      Lval := Read_Discrete (L);
-      Rval := Read_Discrete (R);
-      return Build_Discrete_Range_Type (Lval, Rval, Get_Direction (Rng));
-   end Synth_Discrete_Range_Expression;
-
-   function Synth_Float_Range_Expression
-     (Syn_Inst : Synth_Instance_Acc; Rng : Node) return Float_Range_Type
-   is
-      L, R : Valtyp;
-   begin
-      --  Static values (so no enable).
-      L := Synth_Expression (Syn_Inst, Get_Left_Limit (Rng));
-      R := Synth_Expression (Syn_Inst, Get_Right_Limit (Rng));
-      return (Get_Direction (Rng), Read_Fp64 (L), Read_Fp64 (R));
-   end Synth_Float_Range_Expression;
-
-   --  Return the type of EXPR without evaluating it.
-   function Synth_Type_Of_Object (Syn_Inst : Synth_Instance_Acc; Expr : Node)
-                                 return Type_Acc is
-   begin
-      case Get_Kind (Expr) is
-         when Iir_Kinds_Object_Declaration =>
-            declare
-               Val : constant Valtyp := Get_Value (Syn_Inst, Expr);
-            begin
-               return Val.Typ;
-            end;
-         when Iir_Kind_Simple_Name =>
-            return Synth_Type_Of_Object (Syn_Inst, Get_Named_Entity (Expr));
-         when Iir_Kind_Slice_Name =>
-            declare
-               Pfx_Typ : Type_Acc;
-               Pfx_Bnd : Bound_Type;
-               El_Typ : Type_Acc;
-               Res_Bnd : Bound_Type;
-               Sl_Voff : Net;
-               Sl_Off : Value_Offsets;
-            begin
-               Pfx_Typ := Synth_Type_Of_Object (Syn_Inst, Get_Prefix (Expr));
-               Get_Onedimensional_Array_Bounds (Pfx_Typ, Pfx_Bnd, El_Typ);
-               Synth_Slice_Suffix (Syn_Inst, Expr, Pfx_Bnd, El_Typ,
-                                   Res_Bnd, Sl_Voff, Sl_Off);
-
-               if Sl_Voff /= No_Net then
-                  raise Internal_Error;
-               end if;
-               return Create_Onedimensional_Array_Subtype (Pfx_Typ, Res_Bnd);
-            end;
-         when Iir_Kind_Indexed_Name =>
-            declare
-               Pfx_Typ : Type_Acc;
-            begin
-               Pfx_Typ := Synth_Type_Of_Object (Syn_Inst, Get_Prefix (Expr));
-               return Get_Array_Element (Pfx_Typ);
-            end;
-         when Iir_Kind_Selected_Element =>
-            declare
-               Idx : constant Iir_Index32 :=
-                 Get_Element_Position (Get_Named_Entity (Expr));
-               Pfx_Typ : Type_Acc;
-            begin
-               Pfx_Typ := Synth_Type_Of_Object (Syn_Inst, Get_Prefix (Expr));
-               return Pfx_Typ.Rec.E (Idx + 1).Typ;
-            end;
-
-         when Iir_Kind_Implicit_Dereference
-           | Iir_Kind_Dereference =>
-            declare
-               Val : Valtyp;
-               Res : Valtyp;
-            begin
-               --  Maybe do not dereference it if its type is known ?
-               Val := Synth_Expression (Syn_Inst, Get_Prefix (Expr));
-               Res := Vhdl_Heap.Synth_Dereference (Read_Access (Val));
-               return Res.Typ;
-            end;
-
-         when Iir_Kind_String_Literal8 =>
-            --  TODO: the value should be computed (once) and its type
-            --  returned.
-            return Synth.Decls.Synth_Subtype_Indication
-              (Syn_Inst, Get_Type (Expr));
-
-         when others =>
-            Vhdl.Errors.Error_Kind ("synth_type_of_object", Expr);
-      end case;
-      return null;
-   end Synth_Type_Of_Object;
-
-   function Synth_Array_Attribute (Syn_Inst : Synth_Instance_Acc; Attr : Node)
-                                  return Bound_Type
-   is
-      Prefix_Name : constant Iir := Get_Prefix (Attr);
-      Prefix : constant Iir := Strip_Denoting_Name (Prefix_Name);
-      Dim    : constant Natural :=
-        Vhdl.Evaluation.Eval_Attribute_Parameter_Or_1 (Attr);
-      Typ    : Type_Acc;
-      Val    : Valtyp;
-   begin
-      --  Prefix is an array object or an array subtype.
-      if Get_Kind (Prefix) = Iir_Kind_Subtype_Declaration then
-         --  TODO: does this cover all the cases ?
-         Typ := Get_Subtype_Object (Syn_Inst, Get_Subtype_Indication (Prefix));
-      else
-         Val := Synth_Expression_With_Basetype (Syn_Inst, Prefix_Name);
-         Typ := Val.Typ;
-      end if;
-
-      return Get_Array_Bound (Typ, Dim_Type (Dim));
-   end Synth_Array_Attribute;
-
-   procedure Synth_Discrete_Range (Syn_Inst : Synth_Instance_Acc;
-                                   Bound : Node;
-                                   Rng : out Discrete_Range_Type) is
-   begin
-      case Get_Kind (Bound) is
-         when Iir_Kind_Range_Expression =>
-            Rng := Synth_Discrete_Range_Expression (Syn_Inst, Bound);
-         when Iir_Kind_Integer_Subtype_Definition
-           | Iir_Kind_Enumeration_Subtype_Definition =>
-            if Get_Type_Declarator (Bound) /= Null_Node then
-               declare
-                  Typ : Type_Acc;
-               begin
-                  --  This is a named subtype, so it has been evaluated.
-                  Typ := Get_Subtype_Object (Syn_Inst, Bound);
-                  Rng := Typ.Drange;
-               end;
-            else
-               Synth_Discrete_Range
-                 (Syn_Inst, Get_Range_Constraint (Bound), Rng);
-            end if;
-         when Iir_Kind_Range_Array_Attribute =>
-            declare
-               B : Bound_Type;
-            begin
-               B := Synth_Array_Attribute (Syn_Inst, Bound);
-               Rng := Build_Discrete_Range_Type
-                 (Int64 (B.Left), Int64 (B.Right), B.Dir);
-            end;
-         when Iir_Kind_Reverse_Range_Array_Attribute =>
-            declare
-               B : Bound_Type;
-               T : Int32;
-            begin
-               B := Synth_Array_Attribute (Syn_Inst, Bound);
-               --  Reverse
-               case B.Dir is
-                  when Dir_To =>
-                     B.Dir := Dir_Downto;
-                  when Dir_Downto =>
-                     B.Dir := Dir_To;
-               end case;
-               T := B.Right;
-               B.Right := B.Left;
-               B.Left := T;
-
-               Rng := Build_Discrete_Range_Type
-                 (Int64 (B.Left), Int64 (B.Right), B.Dir);
-            end;
-         when Iir_Kinds_Denoting_Name =>
-            --  A discrete subtype name.
-            Synth_Discrete_Range
-              (Syn_Inst, Get_Subtype_Indication (Get_Named_Entity (Bound)),
-               Rng);
-         when others =>
-            Error_Kind ("synth_discrete_range", Bound);
-      end case;
-   end Synth_Discrete_Range;
-
-   function Synth_Array_Bounds (Syn_Inst : Synth_Instance_Acc;
-                                Atype : Node;
-                                Dim : Dim_Type) return Bound_Type
-   is
-      Info : constant Sim_Info_Acc := Get_Info (Atype);
-   begin
-      if Info = null then
-         pragma Assert (Get_Type_Declarator (Atype) = Null_Node);
-         declare
-            Index_Type : constant Node :=
-              Get_Index_Type (Atype, Natural (Dim - 1));
-         begin
-            return Synth_Bounds_From_Range (Syn_Inst, Index_Type);
-         end;
-      else
-         declare
-            Bnds : constant Type_Acc := Get_Subtype_Object (Syn_Inst, Atype);
-         begin
-            case Bnds.Kind is
-               when Type_Vector =>
-                  pragma Assert (Dim = 1);
-                  return Bnds.Vbound;
-               when Type_Array =>
-                  return Bnds.Abounds.D (Dim);
-               when others =>
-                  raise Internal_Error;
-            end case;
-         end;
-      end if;
-   end Synth_Array_Bounds;
-
-   function Synth_Bounds_From_Range (Syn_Inst : Synth_Instance_Acc;
-                                     Atype : Node) return Bound_Type
-   is
-      Rng : Discrete_Range_Type;
-   begin
-      Synth_Discrete_Range (Syn_Inst, Atype, Rng);
-      return (Dir => Rng.Dir,
-              Left => Int32 (Rng.Left), Right => Int32 (Rng.Right),
-              Len => Get_Range_Length (Rng));
-   end Synth_Bounds_From_Range;
-
-   function Synth_Bounds_From_Length (Atype : Node; Len : Int32)
-                                     return Bound_Type
-   is
-      Rng : constant Node := Get_Range_Constraint (Atype);
-      Limit : Int32;
-   begin
-      Limit := Int32 (Eval_Pos (Get_Left_Limit (Rng)));
-      case Get_Direction (Rng) is
-         when Dir_To =>
-            return (Dir => Dir_To,
-                    Left => Limit,
-                    Right => Limit + Len - 1,
-                    Len => Uns32 (Len));
-         when Dir_Downto =>
-            return (Dir => Dir_Downto,
-                    Left => Limit,
-                    Right => Limit - Len + 1,
-                    Len => Uns32 (Len));
-      end case;
-   end Synth_Bounds_From_Length;
-
-   function Synth_Simple_Aggregate (Syn_Inst : Synth_Instance_Acc;
-                                    Aggr : Node) return Valtyp
-   is
-      Aggr_Type : constant Node := Get_Type (Aggr);
-      pragma Assert (Get_Nbr_Dimensions (Aggr_Type) = 1);
-      El_Type : constant Node := Get_Element_Subtype (Aggr_Type);
-      El_Typ : constant Type_Acc := Get_Subtype_Object (Syn_Inst, El_Type);
-      Els : constant Iir_Flist := Get_Simple_Aggregate_List (Aggr);
-      Last : constant Natural := Flist_Last (Els);
-      Bnd : Bound_Type;
-      Bnds : Bound_Array_Acc;
-      Res_Type : Type_Acc;
-      Val : Valtyp;
-      Res : Valtyp;
-   begin
-      --  Allocate the result.
-      Bnd := Synth_Array_Bounds (Syn_Inst, Aggr_Type, 1);
-      pragma Assert (Bnd.Len = Uns32 (Last + 1));
-
-      if El_Typ.Kind in Type_Nets then
-         Res_Type := Create_Vector_Type (Bnd, El_Typ);
-      else
-         Bnds := Create_Bound_Array (1);
-         Bnds.D (1) := Bnd;
-         Res_Type := Create_Array_Type (Bnds, El_Typ);
-      end if;
-
-      Res := Create_Value_Memory (Res_Type);
-
-      for I in Flist_First .. Last loop
-         --  Elements are supposed to be static, so no need for enable.
-         Val := Synth_Expression_With_Type
-           (Syn_Inst, Get_Nth_Element (Els, I), El_Typ);
-         pragma Assert (Is_Static (Val.Val));
-         Write_Value (Res.Val.Mem + Size_Type (I) * El_Typ.Sz, Val);
-      end loop;
-
-      return Res;
-   end Synth_Simple_Aggregate;
-
-   --  Change the bounds of VAL.
-   function Reshape_Value (Val : Valtyp; Ntype : Type_Acc) return Valtyp is
-   begin
-      case Val.Val.Kind is
-         when Value_Wire =>
-            return Create_Value_Wire (Val.Val.W, Ntype);
-         when Value_Net =>
-            return Create_Value_Net (Val.Val.N, Ntype);
-         when Value_Alias =>
-            return Create_Value_Alias
-              ((Val.Val.A_Typ, Val.Val.A_Obj), Val.Val.A_Off, Ntype);
-         when Value_Const =>
-            return Reshape_Value ((Val.Typ, Val.Val.C_Val), Ntype);
-         when Value_Memory =>
-            return (Ntype, Val.Val);
-         when others =>
-            raise Internal_Error;
-      end case;
-   end Reshape_Value;
-
-   function Synth_Subtype_Conversion (Ctxt : Context_Acc;
-                                      Vt : Valtyp;
-                                      Dtype : Type_Acc;
-                                      Bounds : Boolean;
-                                      Loc : Source.Syn_Src)
-                                     return Valtyp
-   is
-      Vtype : constant Type_Acc := Vt.Typ;
-   begin
-      if Vt = No_Valtyp then
-         --  Propagate error.
-         return No_Valtyp;
-      end if;
-      if Dtype = Vtype then
-         return Vt;
-      end if;
-
-      case Dtype.Kind is
-         when Type_Bit =>
-            pragma Assert (Vtype.Kind = Type_Bit);
-            return Vt;
-         when Type_Logic =>
-            pragma Assert (Vtype.Kind = Type_Logic);
-            return Vt;
-         when Type_Discrete =>
-            pragma Assert (Vtype.Kind in Type_All_Discrete);
-            case Vt.Val.Kind is
-               when Value_Net
-                  | Value_Wire
-                  | Value_Alias =>
-                  if Vtype.W /= Dtype.W then
-                     --  Truncate.
-                     --  TODO: check overflow.
-                     declare
-                        N : Net;
-                     begin
-                        if Is_Static_Val (Vt.Val) then
-                           return Create_Value_Discrete
-                             (Get_Static_Discrete (Vt), Dtype);
-                        end if;
-
-                        N := Get_Net (Ctxt, Vt);
-                        if Vtype.Drange.Is_Signed then
-                           N := Build2_Sresize
-                             (Ctxt, N, Dtype.W, Get_Location (Loc));
-                        else
-                           N := Build2_Uresize
-                             (Ctxt, N, Dtype.W, Get_Location (Loc));
-                        end if;
-                        return Create_Value_Net (N, Dtype);
-                     end;
-                  else
-                     return Vt;
-                  end if;
-               when Value_Const =>
-                  return Synth_Subtype_Conversion
-                    (Ctxt, (Vt.Typ, Vt.Val.C_Val), Dtype, Bounds, Loc);
-               when Value_Memory =>
-                  --  Check for overflow.
-                  declare
-                     Val : constant Int64 := Read_Discrete (Vt);
-                  begin
-                     if not In_Range (Dtype.Drange, Val) then
-                        Error_Msg_Synth (+Loc, "value out of range");
-                        return No_Valtyp;
-                     end if;
-                     return Create_Value_Discrete (Val, Dtype);
-                  end;
-               when others =>
-                  raise Internal_Error;
-            end case;
-         when Type_Float =>
-            pragma Assert (Vtype.Kind = Type_Float);
-            --  TODO: check range
-            return Vt;
-         when Type_Vector =>
-            pragma Assert (Vtype.Kind = Type_Vector
-                             or Vtype.Kind = Type_Slice);
-            if Dtype.W /= Vtype.W then
-               Error_Msg_Synth
-                 (+Loc, "mismatching vector length; got %v, expect %v",
-                  (Errorout."+" (Vtype.W), +Dtype.W));
-               return No_Valtyp;
-            end if;
-            if Bounds then
-               return Reshape_Value (Vt, Dtype);
-            else
-               return Vt;
-            end if;
-         when Type_Slice =>
-            --  TODO: check width
-            return Vt;
-         when Type_Array =>
-            pragma Assert (Vtype.Kind = Type_Array);
-            --  Check bounds.
-            for I in Vtype.Abounds.D'Range loop
-               if Vtype.Abounds.D (I).Len /= Dtype.Abounds.D (I).Len then
-                  Error_Msg_Synth (+Loc, "mismatching array bounds");
-                  return No_Valtyp;
-               end if;
-            end loop;
-            --  TODO: check element.
-            if Bounds then
-               return Reshape_Value (Vt, Dtype);
-            else
-               return Vt;
-            end if;
-         when Type_Unbounded_Array =>
-            pragma Assert (Vtype.Kind = Type_Array);
-            return Vt;
-         when Type_Unbounded_Vector =>
-            pragma Assert (Vtype.Kind = Type_Vector
-                             or else Vtype.Kind = Type_Slice);
-            return Vt;
-         when Type_Record =>
-            pragma Assert (Vtype.Kind = Type_Record);
-            --  TODO: handle elements.
-            return Vt;
-         when Type_Unbounded_Record =>
-            pragma Assert (Vtype.Kind = Type_Record);
-            return Vt;
-         when Type_Access =>
-            return Vt;
-         when Type_File
-            | Type_Protected =>
-            --  No conversion expected.
-            --  As the subtype is identical, it is already handled by the
-            --  above check.
-            raise Internal_Error;
-      end case;
-   end Synth_Subtype_Conversion;
-
-   function Synth_Value_Attribute (Syn_Inst : Synth_Instance_Acc; Attr : Node)
-                                  return Valtyp
-   is
-      Param : constant Node := Get_Parameter (Attr);
-      Etype : constant Node := Get_Type (Attr);
-      Btype : constant Node := Get_Base_Type (Etype);
-      V : Valtyp;
-      Dtype : Type_Acc;
-   begin
-      --  The value is supposed to be static.
-      V := Synth_Expression (Syn_Inst, Param);
-      if V = No_Valtyp then
-         return No_Valtyp;
-      end if;
-
-      Dtype := Get_Subtype_Object (Syn_Inst, Etype);
-      if not Is_Static (V.Val) then
-         Error_Msg_Synth (+Attr, "parameter of 'value must be static");
-         return No_Valtyp;
-      end if;
-
-      declare
-         Str : constant String := Value_To_String (V);
-         Res_N : Node;
-         Val : Int64;
-      begin
-         case Get_Kind (Btype) is
-            when Iir_Kind_Enumeration_Type_Definition =>
-               Res_N := Eval_Value_Attribute (Str, Etype, Attr);
-               Val := Int64 (Get_Enum_Pos (Res_N));
-               Free_Iir (Res_N);
-            when Iir_Kind_Integer_Type_Definition =>
-               Val := Int64'Value (Str);
-            when others =>
-               Error_Msg_Synth (+Attr, "unhandled type for 'value");
-               return No_Valtyp;
-         end case;
-         return Create_Value_Discrete (Val, Dtype);
-      end;
-   end Synth_Value_Attribute;
-
-   function Synth_Image_Attribute_Str (Val : Valtyp; Expr_Type : Iir)
-                                      return String
-   is
-      use Grt.Types;
-   begin
-      case Get_Kind (Expr_Type) is
-         when Iir_Kind_Floating_Type_Definition
-           | Iir_Kind_Floating_Subtype_Definition =>
-            declare
-               Str : String (1 .. 24);
-               Last : Natural;
-            begin
-               Grt.To_Strings.To_String
-                 (Str, Last, Ghdl_F64 (Read_Fp64 (Val)));
-               return Str (Str'First .. Last);
-            end;
-         when Iir_Kind_Integer_Type_Definition
-           | Iir_Kind_Integer_Subtype_Definition =>
-            declare
-               Str : String (1 .. 21);
-               First : Natural;
-            begin
-               Grt.To_Strings.To_String
-                 (Str, First, Ghdl_I64 (Read_Discrete (Val)));
-               return Str (First .. Str'Last);
-            end;
-         when Iir_Kind_Enumeration_Type_Definition
-           | Iir_Kind_Enumeration_Subtype_Definition =>
-            declare
-               Lits : constant Iir_Flist :=
-                 Get_Enumeration_Literal_List (Get_Base_Type (Expr_Type));
-            begin
-               return Name_Table.Image
-                 (Get_Identifier
-                    (Get_Nth_Element (Lits, Natural (Read_Discrete (Val)))));
-            end;
-         when Iir_Kind_Physical_Type_Definition
-           | Iir_Kind_Physical_Subtype_Definition =>
-            declare
-               Str : String (1 .. 21);
-               First : Natural;
-               Id : constant Name_Id :=
-                 Get_Identifier (Get_Primary_Unit (Get_Base_Type (Expr_Type)));
-            begin
-               Grt.To_Strings.To_String
-                 (Str, First, Ghdl_I64 (Read_Discrete (Val)));
-               return Str (First .. Str'Last) & ' ' & Name_Table.Image (Id);
-            end;
-         when others =>
-            Error_Kind ("execute_image_attribute", Expr_Type);
-      end case;
-   end Synth_Image_Attribute_Str;
-
-   function String_To_Valtyp (Str : String; Styp : Type_Acc) return Valtyp
-   is
-      Len : constant Natural := Str'Length;
-      Bnd : Bound_Array_Acc;
-      Typ : Type_Acc;
-      Res : Valtyp;
-   begin
-      Bnd := Create_Bound_Array (1);
-      Bnd.D (1) := (Dir => Dir_To, Left => 1, Right => Int32 (Len),
-                    Len => Width (Len));
-      Typ := Create_Array_Type (Bnd, Styp.Uarr_El);
-
-      Res := Create_Value_Memory (Typ);
-      for I in Str'Range loop
-         Write_U8 (Res.Val.Mem + Size_Type (I - Str'First),
-                   Character'Pos (Str (I)));
-      end loop;
-      return Res;
-   end String_To_Valtyp;
-
-   function Synth_Image_Attribute (Syn_Inst : Synth_Instance_Acc; Attr : Node)
-                                  return Valtyp
-   is
-      Param : constant Node := Get_Parameter (Attr);
-      Etype : constant Node := Get_Type (Attr);
-      V : Valtyp;
-      Dtype : Type_Acc;
-   begin
-      --  The parameter is expected to be static.
-      V := Synth_Expression (Syn_Inst, Param);
-      if V = No_Valtyp then
-         return No_Valtyp;
-      end if;
-      Dtype := Get_Subtype_Object (Syn_Inst, Etype);
-      if not Is_Static (V.Val) then
-         Error_Msg_Synth (+Attr, "parameter of 'image must be static");
-         return No_Valtyp;
-      end if;
-
-      Strip_Const (V);
-      return String_To_Valtyp
-        (Synth_Image_Attribute_Str (V, Get_Type (Param)), Dtype);
-   end Synth_Image_Attribute;
-
-   function Synth_Instance_Name_Attribute
-     (Syn_Inst : Synth_Instance_Acc; Attr : Node) return Valtyp
-   is
-      Atype : constant Node := Get_Type (Attr);
-      Atyp  : constant Type_Acc := Get_Subtype_Object (Syn_Inst, Atype);
-      Name  : constant Path_Instance_Name_Type :=
-        Get_Path_Instance_Name_Suffix (Attr);
-   begin
-      --  Return a truncated name, as the prefix is not completly known.
-      return String_To_Valtyp (Name.Suffix, Atyp);
-   end Synth_Instance_Name_Attribute;
-
-   function Synth_Name (Syn_Inst : Synth_Instance_Acc; Name : Node)
-                       return Valtyp is
-   begin
-      case Get_Kind (Name) is
-         when Iir_Kind_Simple_Name
-           | Iir_Kind_Selected_Name =>
-            return Synth_Name (Syn_Inst, Get_Named_Entity (Name));
-         when Iir_Kind_Interface_Signal_Declaration
-           | Iir_Kind_Variable_Declaration
-           | Iir_Kind_Interface_Variable_Declaration
-           | Iir_Kind_Signal_Declaration
-           | Iir_Kind_Interface_Constant_Declaration
-           | Iir_Kind_Constant_Declaration
-           | Iir_Kind_Iterator_Declaration
-           | Iir_Kind_Object_Alias_Declaration
-           | Iir_Kind_File_Declaration
-           | Iir_Kind_Interface_File_Declaration =>
-            return Get_Value (Syn_Inst, Name);
-         when Iir_Kind_Enumeration_Literal =>
-            declare
-               Typ : constant Type_Acc :=
-                 Get_Subtype_Object (Syn_Inst, Get_Type (Name));
-               Res : Valtyp;
-            begin
-               Res := Create_Value_Memory (Typ);
-               Write_Discrete (Res, Int64 (Get_Enum_Pos (Name)));
-               return Res;
-            end;
-         when Iir_Kind_Unit_Declaration =>
-            declare
-               Typ : constant Type_Acc :=
-                 Get_Subtype_Object (Syn_Inst, Get_Type (Name));
-            begin
-               return Create_Value_Discrete
-                 (Vhdl.Evaluation.Get_Physical_Value (Name), Typ);
-            end;
-         when Iir_Kind_Implicit_Dereference
-           | Iir_Kind_Dereference =>
-            declare
-               Val : Valtyp;
-            begin
-               Val := Synth_Expression (Syn_Inst, Get_Prefix (Name));
-               return Vhdl_Heap.Synth_Dereference (Read_Access (Val));
-            end;
-         when others =>
-            Error_Kind ("synth_name", Name);
-      end case;
-   end Synth_Name;
-
-   --  Convert index IDX in PFX to an offset.
-   --  SYN_INST and LOC are used in case of error.
-   function Index_To_Offset
-     (Syn_Inst : Synth_Instance_Acc; Bnd : Bound_Type; Idx : Int64; Loc : Node)
-     return Value_Offsets
-   is
-      Res : Value_Offsets;
-   begin
-      if not In_Bounds (Bnd, Int32 (Idx)) then
-         Error_Msg_Synth (+Loc, "index not within bounds");
-         Synth.Debugger.Debug_Error (Syn_Inst, Loc);
-         return (0, 0);
-      end if;
-
-      --  The offset is from the LSB (bit 0).  Bit 0 is the rightmost one.
-      case Bnd.Dir is
-         when Dir_To =>
-            Res.Net_Off := Uns32 (Bnd.Right - Int32 (Idx));
-            Res.Mem_Off := Size_Type (Int32 (Idx) - Bnd.Left);
-         when Dir_Downto =>
-            Res.Net_Off := Uns32 (Int32 (Idx) - Bnd.Right);
-            Res.Mem_Off := Size_Type (Bnd.Left - Int32 (Idx));
-      end case;
-
-      return Res;
-   end Index_To_Offset;
-
-   function Dyn_Index_To_Offset
-     (Ctxt : Context_Acc; Bnd : Bound_Type; Idx_Val : Valtyp; Loc : Node)
-     return Net
-   is
-      Idx2 : Net;
-      Off : Net;
-      Right : Net;
-      Wbounds : Width;
-   begin
-      Wbounds := Clog2 (Bnd.Len);
-      Idx2 := Synth_Resize (Ctxt, Idx_Val, Wbounds, Loc);
-
-      if Bnd.Right = 0 and then Bnd.Dir = Dir_Downto then
-         --  Simple case without adjustments.
-         return Idx2;
-      end if;
-
-      Right := Build_Const_UB32 (Ctxt, To_Uns32 (Bnd.Right), Wbounds);
-      Set_Location (Right, Loc);
-
-      case Bnd.Dir is
-         when Dir_To =>
-            --  L <= I <= R    -->   off = R - I
-            Off := Build_Dyadic (Ctxt, Id_Sub, Right, Idx2);
-         when Dir_Downto =>
-            --  L >= I >= R    -->   off = I - R
-            Off := Build_Dyadic (Ctxt, Id_Sub, Idx2, Right);
-      end case;
-      Set_Location (Off, Loc);
-      return Off;
-   end Dyn_Index_To_Offset;
-
-   --  Return the bounds of a one dimensional array/vector type and the
-   --  width of the element.
-   procedure Get_Onedimensional_Array_Bounds
-     (Typ : Type_Acc; Bnd : out Bound_Type; El_Typ : out Type_Acc) is
-   begin
-      case Typ.Kind is
-         when Type_Vector =>
-            El_Typ := Typ.Vec_El;
-            Bnd := Typ.Vbound;
-         when Type_Array =>
-            El_Typ := Typ.Arr_El;
-            Bnd := Typ.Abounds.D (1);
-         when others =>
-            raise Internal_Error;
-      end case;
-   end Get_Onedimensional_Array_Bounds;
-
-   function Create_Onedimensional_Array_Subtype
-     (Btyp : Type_Acc; Bnd : Bound_Type) return Type_Acc
-   is
-      Res : Type_Acc;
-      Bnds : Bound_Array_Acc;
-   begin
-      case Btyp.Kind is
-         when Type_Vector =>
-            Res := Create_Vector_Type (Bnd, Btyp.Vec_El);
-         when Type_Unbounded_Vector =>
-            Res := Create_Vector_Type (Bnd, Btyp.Uvec_El);
-         when Type_Array =>
-            pragma Assert (Btyp.Abounds.Ndim = 1);
-            Bnds := Create_Bound_Array (1);
-            Bnds.D (1) := Bnd;
-            Res := Create_Array_Type (Bnds, Btyp.Arr_El);
-         when Type_Unbounded_Array =>
-            pragma Assert (Btyp.Uarr_Ndim = 1);
-            Bnds := Create_Bound_Array (1);
-            Bnds.D (1) := Bnd;
-            Res := Create_Array_Type (Bnds, Btyp.Uarr_El);
-         when others =>
-            raise Internal_Error;
-      end case;
-      return Res;
-   end Create_Onedimensional_Array_Subtype;
-
-   procedure Synth_Indexed_Name (Syn_Inst : Synth_Instance_Acc;
-                                 Name : Node;
-                                 Pfx_Type : Type_Acc;
-                                 Voff : out Net;
-                                 Off : out Value_Offsets)
-   is
-      Ctxt : constant Context_Acc := Get_Build (Syn_Inst);
-      Indexes : constant Iir_Flist := Get_Index_List (Name);
-      El_Typ : constant Type_Acc := Get_Array_Element (Pfx_Type);
-      Idx_Expr : Node;
-      Idx_Val : Valtyp;
-      Bnd : Bound_Type;
-      Stride : Uns32;
-      Ivoff : Net;
-      Idx_Off : Value_Offsets;
-   begin
-      Voff := No_Net;
-      Off := (0, 0);
-
-      Stride := 1;
-      for I in reverse Flist_First .. Flist_Last (Indexes) loop
-         Idx_Expr := Get_Nth_Element (Indexes, I);
-
-         --  Use the base type as the subtype of the index is not synth-ed.
-         Idx_Val := Synth_Expression_With_Basetype (Syn_Inst, Idx_Expr);
-         if Idx_Val = No_Valtyp then
-            --  Propagate errorc
-            Voff := No_Net;
-            Off := (0, 0);
-            return;
-         end if;
-
-         Strip_Const (Idx_Val);
-
-         Bnd := Get_Array_Bound (Pfx_Type, Dim_Type (I + 1));
-
-         if Is_Static_Val (Idx_Val.Val) then
-            Idx_Off := Index_To_Offset (Syn_Inst, Bnd,
-                                        Get_Static_Discrete (Idx_Val), Name);
-            Off.Net_Off := Off.Net_Off + Idx_Off.Net_Off * Stride * El_Typ.W;
-            Off.Mem_Off := Off.Mem_Off
-              + Idx_Off.Mem_Off * Size_Type (Stride) * El_Typ.Sz;
-         else
-            Ivoff := Dyn_Index_To_Offset (Ctxt, Bnd, Idx_Val, Name);
-            Ivoff := Build_Memidx
-              (Get_Build (Syn_Inst), Ivoff, El_Typ.W * Stride,
-               Bnd.Len - 1,
-               Width (Clog2 (Uns64 (Stride * Bnd.Len))));
-            Set_Location (Ivoff, Idx_Expr);
-
-            if Voff = No_Net then
-               Voff := Ivoff;
-            else
-               Voff := Build_Addidx (Get_Build (Syn_Inst), Ivoff, Voff);
-               Set_Location (Voff, Idx_Expr);
-            end if;
-         end if;
-
-         Stride := Stride * Bnd.Len;
-      end loop;
-   end Synth_Indexed_Name;
-
-   function Is_Static (N : Net) return Boolean is
-   begin
-      case Get_Id (Get_Module (Get_Net_Parent (N))) is
-         when Id_Const_UB32 =>
-            return True;
-         when others =>
-            return False;
-      end case;
-   end Is_Static;
-
-   function Get_Const (N : Net) return Int32
-   is
-      Inst : constant Instance := Get_Net_Parent (N);
-   begin
-      case Get_Id (Get_Module (Inst)) is
-         when Id_Const_UB32 =>
-            return To_Int32 (Get_Param_Uns32 (Inst, 0));
-         when others =>
-            raise Internal_Error;
-      end case;
-   end Get_Const;
-
-   --  Decompose VAL as FACTOR * INP + ADDEND (where only INP is non-static).
-   procedure Decompose_Mul_Add (Val : Net;
-                                Inp : out Net;
-                                Factor : out Int32;
-                                Addend : out Int32)
-   is
-      Inst : Instance;
-      Val_I0, Val_I1 : Net;
-   begin
-      Factor := 1;
-      Addend := 0;
-      Inp := Val;
-
-      loop
-         Inst := Get_Net_Parent (Inp);
-         case Get_Id (Get_Module (Inst)) is
-            when Id_Add =>
-               Val_I0 := Get_Input_Net (Inst, 0);
-               Val_I1 := Get_Input_Net (Inst, 1);
-               if Is_Static (Val_I0) then
-                  Addend := Addend + Get_Const (Val_I0) * Factor;
-                  Inp := Val_I1;
-               elsif Is_Static (Val_I1) then
-                  Addend := Addend + Get_Const (Val_I1) * Factor;
-                  Inp := Val_I0;
-               else
-                  --  It's an addition, but without any constant value.
-                  return;
-               end if;
-            when Id_Sub =>
-               Val_I0 := Get_Input_Net (Inst, 0);
-               Val_I1 := Get_Input_Net (Inst, 1);
-               if Is_Static (Val_I1) then
-                  Addend := Addend - Get_Const (Val_I1) * Factor;
-                  Inp := Val_I0;
-               elsif Is_Static (Val_I0) then
-                  Addend := Addend + Get_Const (Val_I0) * Factor;
-                  Factor := -Factor;
-                  Inp := Val_I1;
-               else
-                  --  It's a substraction, but without any constant value.
-                  return;
-               end if;
-            when Id_Smul =>
-               Val_I0 := Get_Input_Net (Inst, 0);
-               Val_I1 := Get_Input_Net (Inst, 1);
-               if Is_Static (Val_I0) then
-                  Factor := Factor * Get_Const (Val_I0);
-                  Inp := Val_I1;
-               elsif Is_Static (Val_I1) then
-                  Factor := Factor * Get_Const (Val_I1);
-                  Inp := Val_I0;
-               else
-                  --  A mul but without any constant value.
-                  return;
-               end if;
-            when Id_Utrunc
-              | Id_Uextend =>
-               Inp := Get_Input_Net (Inst, 0);
-            when others =>
-               --  Cannot decompose it.
-               return;
-         end case;
-      end loop;
-   end Decompose_Mul_Add;
-
-   --  Identify LEFT to/downto RIGHT as:
-   --  INP * STEP + WIDTH - 1 + OFF to/downto INP * STEP + OFF
-   procedure Synth_Extract_Dyn_Suffix (Ctxt : Context_Acc;
-                                       Loc : Node;
-                                       Pfx_Bnd : Bound_Type;
-                                       Left : Net;
-                                       Right : Net;
-                                       Inp : out Net;
-                                       Step : out Uns32;
-                                       Off : out Uns32;
-                                       Width : out Uns32)
-   is
-      L_Inp, R_Inp : Net;
-      L_Fac, R_Fac : Int32;
-      L_Add, R_Add : Int32;
-   begin
-      Inp := No_Net;
-      Step := 0;
-      Off := 0;
-      Width := 0;
-
-      if Left = Right then
-         L_Inp := Left;
-         R_Inp := Right;
-         L_Fac := 1;
-         R_Fac := 1;
-         L_Add := 0;
-         R_Add := 0;
-      else
-         Decompose_Mul_Add (Left, L_Inp, L_Fac, L_Add);
-         Decompose_Mul_Add (Right, R_Inp, R_Fac, R_Add);
-      end if;
-
-      if not Same_Net (L_Inp, R_Inp) then
-         Error_Msg_Synth
-           (+Loc, "cannot extract same variable part for dynamic slice");
-         return;
-      end if;
-      Inp := L_Inp;
-
-      if L_Fac /= R_Fac then
-         Error_Msg_Synth
-           (+Loc, "cannot extract same constant factor for dynamic slice");
-         return;
-      end if;
-      if L_Fac < 0 then
-         Step := Uns32 (-L_Fac);
-         Inp := Build_Monadic (Ctxt, Id_Neg, Inp);
-         Set_Location (Inp, Loc);
-      else
-         Step := Uns32 (L_Fac);
-      end if;
-
-      case Pfx_Bnd.Dir is
-         when Dir_To =>
-            Width := Uns32 (R_Add - L_Add + 1);
-            Off := Uns32 (L_Add - Pfx_Bnd.Left);
-         when Dir_Downto =>
-            Width := Uns32 (L_Add - R_Add + 1);
-            if R_Add >= Pfx_Bnd.Right then
-               Off := Uns32 (R_Add - Pfx_Bnd.Right);
-            else
-               --  Handle biased values.
-               declare
-                  Bias : constant Uns32 :=
-                    (Uns32 (Pfx_Bnd.Right - R_Add) + Step - 1) / Step;
-                  Bias_Net : Net;
-               begin
-                  --  Add bias to INP and adjust the offset.
-                  Bias_Net := Build2_Const_Uns
-                    (Ctxt, Uns64 (Bias), Get_Width (Inp));
-                  Inp := Build_Dyadic (Ctxt, Id_Add, Inp, Bias_Net);
-                  Set_Location (Inp, Loc);
-                  Off := Uns32 (Int32 (Bias * Step) + R_Add - Pfx_Bnd.Right);
-               end;
-            end if;
-      end case;
-   end Synth_Extract_Dyn_Suffix;
-
-   procedure Synth_Slice_Const_Suffix (Syn_Inst: Synth_Instance_Acc;
-                                       Expr : Node;
-                                       Name : Node;
-                                       Pfx_Bnd : Bound_Type;
-                                       L, R : Int64;
-                                       Dir : Direction_Type;
-                                       El_Typ : Type_Acc;
-                                       Res_Bnd : out Bound_Type;
-                                       Off : out Value_Offsets)
-   is
-      Is_Null : Boolean;
-      Len : Uns32;
-   begin
-      if Pfx_Bnd.Dir /= Dir then
-         Error_Msg_Synth (+Name, "direction mismatch in slice");
-         Off := (0, 0);
-         if Dir = Dir_To then
-            Res_Bnd := (Dir => Dir_To, Left => 1, Right => 0, Len => 0);
-         else
-            Res_Bnd := (Dir => Dir_Downto, Left => 0, Right => 1, Len => 0);
-         end if;
-         return;
-      end if;
-
-      --  Might be a null slice.
-      case Pfx_Bnd.Dir is
-         when Dir_To =>
-            Is_Null := L > R;
-         when Dir_Downto =>
-            Is_Null := L < R;
-      end case;
-      if Is_Null then
-         Len := 0;
-         Off := (0, 0);
-      else
-         if not In_Bounds (Pfx_Bnd, Int32 (L))
-           or else not In_Bounds (Pfx_Bnd, Int32 (R))
-         then
-            Error_Msg_Synth (+Name, "index not within bounds");
-            Synth.Debugger.Debug_Error (Syn_Inst, Expr);
-            Off := (0, 0);
-            return;
-         end if;
-
-         case Pfx_Bnd.Dir is
-            when Dir_To =>
-               Len := Uns32 (R - L + 1);
-               Off.Net_Off := Uns32 (Pfx_Bnd.Right - Int32 (R)) * El_Typ.W;
-               Off.Mem_Off := Size_Type (Int32 (L) - Pfx_Bnd.Left) * El_Typ.Sz;
-            when Dir_Downto =>
-               Len := Uns32 (L - R + 1);
-               Off.Net_Off := Uns32 (Int32 (R) - Pfx_Bnd.Right) * El_Typ.W;
-               Off.Mem_Off := Size_Type (Pfx_Bnd.Left - Int32 (L)) * El_Typ.Sz;
-         end case;
-      end if;
-      Res_Bnd := (Dir => Pfx_Bnd.Dir,
-                  Len => Len,
-                  Left => Int32 (L),
-                  Right => Int32 (R));
-   end Synth_Slice_Const_Suffix;
-
-   procedure Synth_Slice_Suffix (Syn_Inst : Synth_Instance_Acc;
-                                 Name : Node;
-                                 Pfx_Bnd : Bound_Type;
-                                 El_Typ : Type_Acc;
-                                 Res_Bnd : out Bound_Type;
-                                 Inp : out Net;
-                                 Off : out Value_Offsets)
-   is
-      Ctxt : constant Context_Acc := Get_Build (Syn_Inst);
-      Expr : constant Node := Get_Suffix (Name);
-      Left, Right : Valtyp;
-      Dir : Direction_Type;
-      Step : Uns32;
-      Max : Uns32;
-      Inp_W : Width;
-   begin
-      Off := (0, 0);
-      Inp := No_Net;
-
-      case Get_Kind (Expr) is
-         when Iir_Kind_Range_Expression =>
-            --  As the range may be dynamic, cannot use synth_discrete_range.
-            Left := Synth_Expression_With_Basetype
-              (Syn_Inst, Get_Left_Limit (Expr));
-            Right := Synth_Expression_With_Basetype
-              (Syn_Inst, Get_Right_Limit (Expr));
-            Dir := Get_Direction (Expr);
-
-         when Iir_Kind_Range_Array_Attribute
-           | Iir_Kind_Reverse_Range_Array_Attribute
-           | Iir_Kinds_Denoting_Name =>
-            declare
-               Rng : Discrete_Range_Type;
-            begin
-               Synth_Discrete_Range (Syn_Inst, Expr, Rng);
-               Synth_Slice_Const_Suffix (Syn_Inst, Expr,
-                                         Name, Pfx_Bnd,
-                                         Rng.Left, Rng.Right, Rng.Dir,
-                                         El_Typ, Res_Bnd, Off);
-               return;
-            end;
-         when others =>
-            Error_Msg_Synth
-              (+Expr, "only range expression supported for slices");
-            Res_Bnd := (Dir => Dir_To, Left => 1, Right => 0, Len => 0);
-            return;
-      end case;
-
-      if Is_Static_Val (Left.Val) and then Is_Static_Val (Right.Val) then
-         Synth_Slice_Const_Suffix (Syn_Inst, Expr,
-                                   Name, Pfx_Bnd,
-                                   Get_Static_Discrete (Left),
-                                   Get_Static_Discrete (Right),
-                                   Dir,
-                                   El_Typ, Res_Bnd, Off);
-      else
-         if Pfx_Bnd.Dir /= Dir then
-            Error_Msg_Synth (+Name, "direction mismatch in slice");
-            if Dir = Dir_To then
-               Res_Bnd := (Dir => Dir_To, Left => 1, Right => 0, Len => 0);
-            else
-               Res_Bnd := (Dir => Dir_Downto, Left => 0, Right => 1, Len => 0);
-            end if;
-            return;
-         end if;
-
-         if Is_Static (Left.Val) or else Is_Static (Right.Val) then
-            Error_Msg_Synth
-              (+Name, "left and right bounds of a slice must be "
-                 & "either constant or dynamic");
-            return;
-         end if;
-
-         Synth_Extract_Dyn_Suffix
-           (Ctxt, Name, Pfx_Bnd, Get_Net (Ctxt, Left), Get_Net (Ctxt, Right),
-            Inp, Step, Off.Net_Off, Res_Bnd.Len);
-         if Inp = No_Net then
-            return;
-         end if;
-         Inp_W := Get_Width (Inp);
-         --  FIXME: convert range to offset.
-         --  Extract max from the range.
-         --  example: len=128  wd=8  step=8  => max=16
-         --           len=8    wd=4  step=1  => max=4
-         --  max so that max*step+wd <= len - off
-         --              max <= (len - off - wd) / step
-         Max := (Pfx_Bnd.Len - Off.Net_Off - Res_Bnd.Len) / Step;
-         if Clog2 (Uns64 (Max)) > Natural (Inp_W) then
-            --  The width of Inp limits the max.
-            Max := 2**Natural (Inp_W) - 1;
-         end if;
-         Inp := Build_Memidx
-           (Ctxt, Inp, Step * El_Typ.W, Max,
-            Inp_W + Width (Clog2 (Uns64 (Step * El_Typ.W))));
-         Set_Location (Inp, Name);
-      end if;
-   end Synth_Slice_Suffix;
-
-   --  Match: clk_signal_name'event
-   --  and return clk_signal_name.
-   function Extract_Event_Expr_Prefix (Expr : Node) return Node is
-   begin
-      if Get_Kind (Expr) = Iir_Kind_Event_Attribute then
-         return Get_Prefix (Expr);
-      else
-         return Null_Node;
-      end if;
-   end Extract_Event_Expr_Prefix;
-
-   function Is_Same_Clock (Syn_Inst : Synth_Instance_Acc;
-                           Left, Right : Node;
-                           Clk_Left : Net) return Boolean
-   is
-      N : Net;
-   begin
-      --  Handle directly the common case (when clock is a simple name).
-      if Get_Kind (Left) = Iir_Kind_Simple_Name
-        and then Get_Kind (Right) = Iir_Kind_Simple_Name
-      then
-         return Get_Named_Entity (Left) = Get_Named_Entity (Right);
-      end if;
-
-      N := Get_Net (Get_Build (Syn_Inst), Synth_Expression (Syn_Inst, Right));
-
-      return Same_Net (Clk_Left, N);
-   end Is_Same_Clock;
-
-   --  Match: clk_signal_name = '1' | clk_signal_name = '0'
-   function Extract_Clock_Level
-     (Syn_Inst : Synth_Instance_Acc; Expr : Node; Prefix : Node) return Net
-   is
-      Ctxt        : constant Context_Acc := Get_Build (Syn_Inst);
-      Clk         : Net;
-      Imp         : Node;
-      Left, Right : Node;
-      Lit         : Valtyp;
-      Lit_Type    : Node;
-      Posedge     : Boolean;
-      Res         : Net;
-   begin
-      Clk := Get_Net (Ctxt, Synth_Expression (Syn_Inst, Prefix));
-      if Get_Kind (Expr) /= Iir_Kind_Equality_Operator then
-         Error_Msg_Synth (+Expr, "ill-formed clock-level, '=' expected");
-         Res := Build_Posedge (Ctxt, Clk);
-         Set_Location (Res, Expr);
-         return Res;
-      end if;
-      Imp := Get_Implementation (Expr);
-      if Get_Implicit_Definition (Imp) /= Iir_Predefined_Enum_Equality then
-         Error_Msg_Synth (+Expr, "ill-formed clock-level, '=' expected");
-         Res := Build_Posedge (Ctxt, Clk);
-         Set_Location (Res, Expr);
-         return Res;
-      end if;
-
-      Left := Get_Left (Expr);
-      if not Is_Same_Clock (Syn_Inst, Prefix, Left, Clk) then
-         Error_Msg_Synth (+Left, "clock signal name doesn't match");
-      end if;
-
-      Right := Get_Right (Expr);
-      Lit_Type := Get_Base_Type (Get_Type (Right));
-      Lit := Synth_Expression (Syn_Inst, Right);
-      if Lit.Val.Kind /= Value_Memory then
-         Error_Msg_Synth (+Right, "clock-level is not a constant");
-         Posedge := True;
-      else
-         if Lit_Type = Vhdl.Ieee.Std_Logic_1164.Std_Ulogic_Type then
-            case Read_U8 (Lit.Val.Mem) is
-               when Vhdl.Ieee.Std_Logic_1164.Std_Logic_0_Pos =>
-                  Posedge := False;
-               when Vhdl.Ieee.Std_Logic_1164.Std_Logic_1_Pos =>
-                  Posedge := True;
-               when others =>
-                  Error_Msg_Synth
-                    (+Right, "clock-level must be either '0' or '1'");
-                  Posedge := True;
-            end case;
-         else
-            pragma Assert (Lit_Type = Vhdl.Std_Package.Bit_Type_Definition);
-            case Read_U8 (Lit.Val.Mem) is
-               when 0 =>
-                  Posedge := False;
-               when 1 =>
-                  Posedge := True;
-               when others =>
-                  raise Internal_Error;
-            end case;
-         end if;
-      end if;
-      if Posedge then
-         Res := Build_Posedge (Ctxt, Clk);
-      else
-         Res := Build_Negedge (Ctxt, Clk);
-      end if;
-      Set_Location (Res, Expr);
-      return Res;
-   end Extract_Clock_Level;
-
-   --  Try to match: clk'event and clk = X
-   --            or: clk = X and clk'event
-   --  where X is '0' or '1'.
-   function Synth_Clock_Edge
-     (Syn_Inst : Synth_Instance_Acc; Left, Right : Node) return Net
-   is
-      Prefix : Node;
-   begin
-      --  Try with left.
-      Prefix := Extract_Event_Expr_Prefix (Left);
-      if Is_Valid (Prefix) then
-         return Extract_Clock_Level (Syn_Inst, Right, Prefix);
-      end if;
-
-      --  Try with right.
-      Prefix := Extract_Event_Expr_Prefix (Right);
-      if Is_Valid (Prefix) then
-         return Extract_Clock_Level (Syn_Inst, Left, Prefix);
-      end if;
-
-      return No_Net;
-   end Synth_Clock_Edge;
-
-   function Synth_Type_Conversion
-     (Syn_Inst : Synth_Instance_Acc; Conv : Node) return Valtyp
-   is
-      Expr : constant Node := Get_Expression (Conv);
-      Conv_Type : constant Node := Get_Type (Conv);
-      Conv_Typ : constant Type_Acc := Get_Subtype_Object (Syn_Inst, Conv_Type);
-      Val : Valtyp;
-   begin
-      Val := Synth_Expression_With_Basetype (Syn_Inst, Expr);
-      if Val = No_Valtyp then
-         return No_Valtyp;
-      end if;
-      Strip_Const (Val);
-      case Get_Kind (Conv_Type) is
-         when Iir_Kind_Integer_Subtype_Definition =>
-            if Val.Typ.Kind = Type_Discrete then
-               --  Int to int.
-               return Val;
-            elsif Val.Typ.Kind = Type_Float then
-               return Create_Value_Discrete
-                 (Int64 (Read_Fp64 (Val)), Conv_Typ);
-            else
-               Error_Msg_Synth (+Conv, "unhandled type conversion (to int)");
-               return No_Valtyp;
-            end if;
-         when Iir_Kind_Floating_Subtype_Definition =>
-            if Is_Static (Val.Val) then
-               return Create_Value_Float
-                 (Fp64 (Read_Discrete (Val)), Conv_Typ);
-            else
-               Error_Msg_Synth (+Conv, "unhandled type conversion (to float)");
-               return No_Valtyp;
-            end if;
-         when Iir_Kind_Array_Type_Definition
-           | Iir_Kind_Array_Subtype_Definition =>
-            case Conv_Typ.Kind is
-               when Type_Vector
-                 | Type_Unbounded_Vector =>
-                  return Val;
-               when others =>
-                  Error_Msg_Synth
-                    (+Conv, "unhandled type conversion (to array)");
-                  return No_Valtyp;
-            end case;
-         when Iir_Kind_Enumeration_Type_Definition
-           | Iir_Kind_Enumeration_Subtype_Definition =>
-            pragma Assert (Get_Base_Type (Get_Type (Expr))
-                             = Get_Base_Type (Conv_Type));
-            return Val;
-         when others =>
-            Error_Msg_Synth (+Conv, "unhandled type conversion");
-            return No_Valtyp;
-      end case;
-   end Synth_Type_Conversion;
-
-   function Error_Ieee_Operator (Imp : Node; Loc : Node) return Boolean
-   is
-      use Std_Names;
-      Parent : constant Iir := Get_Parent (Imp);
-   begin
-      if Get_Kind (Parent) = Iir_Kind_Package_Declaration
-        and then (Get_Identifier
-                    (Get_Library (Get_Design_File (Get_Design_Unit (Parent))))
-                    = Name_Ieee)
-      then
-         case Get_Identifier (Parent) is
-            when Name_Std_Logic_1164
-               | Name_Std_Logic_Arith
-               | Name_Std_Logic_Signed
-               | Name_Std_Logic_Unsigned
-               | Name_Std_Logic_Misc
-               | Name_Numeric_Std
-               | Name_Numeric_Bit
-               | Name_Math_Real =>
-               Error_Msg_Synth
-                 (+Loc, "unhandled predefined IEEE operator %i", +Imp);
-               Error_Msg_Synth
-                 (+Imp, " declared here");
-               return True;
-            when others =>
-               --  ieee 2008 packages are handled like regular packages.
-               null;
-         end case;
-      end if;
-
-      return False;
-   end Error_Ieee_Operator;
-
-   function Synth_String_Literal
-     (Syn_Inst : Synth_Instance_Acc; Str : Node; Str_Typ : Type_Acc)
-     return Valtyp
-   is
-      pragma Assert (Get_Kind (Str) = Iir_Kind_String_Literal8);
-      Id : constant String8_Id := Get_String8_Id (Str);
-
-      Str_Type : constant Node := Get_Type (Str);
-      El_Type : Type_Acc;
-      Bounds : Bound_Type;
-      Bnds : Bound_Array_Acc;
-      Res_Type : Type_Acc;
-      Res : Valtyp;
-      Pos : Nat8;
-   begin
-      case Str_Typ.Kind is
-         when Type_Vector =>
-            Bounds := Str_Typ.Vbound;
-         when Type_Array =>
-            Bounds := Str_Typ.Abounds.D (1);
-         when Type_Unbounded_Vector
-            | Type_Unbounded_Array =>
-            Bounds := Synth_Bounds_From_Length
-              (Get_Index_Type (Str_Type, 0), Get_String_Length (Str));
-         when others =>
-            raise Internal_Error;
-      end case;
-
-      El_Type := Get_Subtype_Object (Syn_Inst, Get_Element_Subtype (Str_Type));
-      if El_Type.Kind in Type_Nets then
-         Res_Type := Create_Vector_Type (Bounds, El_Type);
-      else
-         Bnds := Create_Bound_Array (1);
-         Bnds.D (1) := Bounds;
-         Res_Type := Create_Array_Type (Bnds, El_Type);
-      end if;
-      Res := Create_Value_Memory (Res_Type);
-
-      --  Only U8 are handled.
-      pragma Assert (El_Type.Sz = 1);
-
-      --  From left to right.
-      for I in 1 .. Bounds.Len loop
-         -- FIXME: use literal from type ??
-         Pos := Str_Table.Element_String8 (Id, Pos32 (I));
-         Write_U8 (Res.Val.Mem + Size_Type (I - 1), Nat8'Pos (Pos));
-      end loop;
-
-      return Res;
-   end Synth_String_Literal;
-
-   --  Return the left bound if the direction of the range is LEFT_DIR.
-   function Synth_Low_High_Type_Attribute
-     (Syn_Inst : Synth_Instance_Acc; Expr : Node; Left_Dir : Direction_Type)
-     return Valtyp
-   is
-      Typ : Type_Acc;
-      R : Int64;
-   begin
-      Typ := Get_Subtype_Object (Syn_Inst, Get_Type (Get_Prefix (Expr)));
-      pragma Assert (Typ.Kind = Type_Discrete);
-      if Typ.Drange.Dir = Left_Dir then
-         R := Typ.Drange.Left;
-      else
-         R := Typ.Drange.Right;
-      end if;
-      return Create_Value_Discrete (R, Typ);
-   end Synth_Low_High_Type_Attribute;
-
-   function Synth_PSL_Expression
-     (Syn_Inst : Synth_Instance_Acc; Expr : PSL.Types.PSL_Node) return Net
-   is
-      use PSL.Types;
-      use PSL.Nodes;
-
-      Ctxt : constant Context_Acc := Get_Build (Syn_Inst);
-      Loc : constant Location_Type := Get_Location (Expr);
-      Res : Net;
-   begin
-      case Get_Kind (Expr) is
-         when N_HDL_Bool =>
-            declare
-               E : constant Vhdl.Types.Vhdl_Node := Get_HDL_Node (Expr);
-            begin
-               return Get_Net (Ctxt, Synth_Expression (Syn_Inst, E));
-            end;
-         when N_Not_Bool =>
-            pragma Assert (Loc /= No_Location);
-            Res := Build_Monadic
-              (Ctxt, Id_Not,
-               Synth_PSL_Expression (Syn_Inst, Get_Boolean (Expr)));
-         when N_And_Bool =>
-            pragma Assert (Loc /= No_Location);
-            declare
-               L : constant PSL_Node := Get_Left (Expr);
-               R : constant PSL_Node := Get_Right (Expr);
-               Edge : Net;
-            begin
-               --  Handle edge (as it can be in default clock).
-               if Get_Kind (L) in N_HDLs and then Get_Kind (R) in N_HDLs then
-                  Edge := Synth_Clock_Edge
-                    (Syn_Inst, Get_HDL_Node (L), Get_HDL_Node (R));
-                  if Edge /= No_Net then
-                     return Edge;
-                  end if;
-               end if;
-               if Get_Kind (R) = N_EOS then
-                  --  It is never EOS!
-                  Res := Build_Const_UB32 (Ctxt, 0, 1);
-               else
-                  Res := Build_Dyadic (Ctxt, Id_And,
-                                       Synth_PSL_Expression (Syn_Inst, L),
-                                       Synth_PSL_Expression (Syn_Inst, R));
-               end if;
-            end;
-         when N_Or_Bool =>
-            pragma Assert (Loc /= No_Location);
-            Res := Build_Dyadic
-              (Ctxt, Id_Or,
-               Synth_PSL_Expression (Syn_Inst, Get_Left (Expr)),
-               Synth_PSL_Expression (Syn_Inst, Get_Right (Expr)));
-         when N_True =>
-            Res := Build_Const_UB32 (Ctxt, 1, 1);
-         when N_False
-           | N_EOS =>
-            Res := Build_Const_UB32 (Ctxt, 0, 1);
-         when others =>
-            PSL.Errors.Error_Kind ("synth_psl_expr", Expr);
-            return No_Net;
-      end case;
-      Netlists.Locations.Set_Location (Get_Net_Parent (Res), Loc);
-      return Res;
-   end Synth_PSL_Expression;
-
-   function Synth_Psl_Function_Clock
-     (Syn_Inst : Synth_Instance_Acc; Call : Node; Ctxt : Context_Acc)
-     return Net
-   is
-      Clock   : Node;
-      Clk     : Valtyp;
-      Clk_Net : Net;
-   begin
-      Clock := Get_Clock_Expression (Call);
-      if Clock /= Null_Node then
-         Clk := Synth_Expression (Syn_Inst, Clock);
-         Clk_Net := Get_Net (Ctxt, Clk);
-      else
-         Clock := Get_Default_Clock (Call);
-         pragma Assert (Clock /= Null_Node);
-         Clk_Net := Synth_PSL_Expression (Syn_Inst, Get_Psl_Boolean (Clock));
-      end if;
-      return Clk_Net;
-   end Synth_Psl_Function_Clock;
-
-   function Synth_Psl_Prev (Syn_Inst : Synth_Instance_Acc; Call : Node)
-                            return Valtyp
-   is
-      Ctxt      : constant Context_Acc := Get_Build (Syn_Inst);
-      Count     : constant Node := Get_Count_Expression (Call);
-      Count_Val : Valtyp;
-      Dff       : Net;
-      Expr      : Valtyp;
-      Clk_Net   : Net;
-      Num       : Int64;
-   begin
-      Expr := Synth_Expression_With_Basetype (Syn_Inst, Get_Expression (Call));
-
-      Clk_Net := Synth_Psl_Function_Clock (Syn_Inst, Call, Ctxt);
-
-      if Count /= Null_Node then
-         Count_Val := Synth_Expression (Syn_Inst, Count);
-         Num := Read_Discrete (Count_Val);
-         pragma Assert (Num >= 1);
-      else
-         Num := 1;
-      end if;
-
-      Dff := Get_Net (Ctxt, Expr);
-      for I in 1 .. Num loop
-         Dff := Build_Dff (Ctxt, Clk_Net, Dff);
-         Set_Location (Dff, Call);
-      end loop;
-
-      return Create_Value_Net (Dff, Expr.Typ);
-   end Synth_Psl_Prev;
-
-   function Synth_Psl_Stable (Syn_Inst : Synth_Instance_Acc; Call : Node)
-                              return Valtyp
-   is
-      Ctxt    : constant Context_Acc := Get_Build (Syn_Inst);
-      DffCurr : Net;
-      Dff     : Net;
-      Expr    : Valtyp;
-      Clk_Net : Net;
-      Res     : Net;
-   begin
-      Expr := Synth_Expression_With_Basetype (Syn_Inst, Get_Expression (Call));
-
-      Clk_Net := Synth_Psl_Function_Clock (Syn_Inst, Call, Ctxt);
-
-      DffCurr := Get_Net (Ctxt, Expr);
-      Set_Location (DffCurr, Call);
-      Dff := Build_Dff (Ctxt, Clk_Net, DffCurr);
-      Set_Location (Dff, Call);
-
-      Res := Build_Compare(Ctxt, Id_Eq, DffCurr, Dff);
-      Set_Location (Res, Call);
-
-      return Create_Value_Net (Res, Boolean_Type);
-
-   end Synth_Psl_Stable;
-
-   function Synth_Psl_Rose (Syn_Inst : Synth_Instance_Acc; Call : Node)
-                            return Valtyp
-   is
-      Ctxt    : constant Context_Acc := Get_Build (Syn_Inst);
-      DffCurr : Net;
-      Dff     : Net;
-      NotDff  : Net;
-      Clk_Net : Net;
-      Expr    : Valtyp;
-      Res     : Net;
-   begin
-      Expr := Synth_Expression (Syn_Inst, Get_Expression (Call));
-
-      Clk_Net := Synth_Psl_Function_Clock (Syn_Inst, Call, Ctxt);
-
-      DffCurr := Get_Net (Ctxt, Expr);
-      Set_Location (DffCurr, Call);
-      Dff := Build_Dff (Ctxt, Clk_Net, DffCurr);
-      Set_Location (Dff, Call);
-
-      NotDff := Build_Monadic (Ctxt, Id_Not, Dff);
-      Set_Location (NotDff, Call);
-
-      Res := Build_Dyadic (Ctxt, Id_And,
-             NotDff, DffCurr);
-      Set_Location (Res, Call);
-
-      return Create_Value_Net (Res, Boolean_Type);
-
-   end Synth_Psl_Rose;
-
-   function Synth_Psl_Fell (Syn_Inst : Synth_Instance_Acc; Call : Node)
-                            return Valtyp
-   is
-      Ctxt       : constant Context_Acc := Get_Build (Syn_Inst);
-      DffCurr    : Net;
-      NotDffCurr : Net;
-      Dff        : Net;
-      Clk_Net    : Net;
-      Expr       : Valtyp;
-      Res        : Net;
-   begin
-      Expr := Synth_Expression (Syn_Inst, Get_Expression (Call));
-
-      Clk_Net := Synth_Psl_Function_Clock(Syn_Inst, Call, Ctxt);
-
-      DffCurr := Get_Net (Ctxt, Expr);
-      Set_Location (DffCurr, Call);
-      Dff := Build_Dff (Ctxt, Clk_Net, DffCurr);
-      Set_Location (Dff, Call);
-
-      NotDffCurr := Build_Monadic (Ctxt, Id_Not, DffCurr);
-      Set_Location (NotDffCurr, Call);
-
-      Res := Build_Dyadic (Ctxt, Id_And, Dff, NotDffCurr);
-      Set_Location (Res, Call);
-
-      return Create_Value_Net (Res, Boolean_Type);
-
-   end Synth_Psl_Fell;
-
-   function Synth_Onehot0 (Ctxt : Context_Acc; DffCurr : Net; Call : Node;
-                           Vlen : Uns32)
-                           return Net
-   is
-      DffZero    : Net;
-      DffOne     : Net;
-      DffOneHot0 : Net;
-      Res        : Net;
-   begin
-      -- Create a constant vector of 0 for comparing
-      DffZero := Build2_Const_Uns(Ctxt, 0,  Vlen);
-
-      -- Create vector of value 1 for subtraction
-      DffOne := Build2_Const_Uns(Ctxt, 1,  Vlen);
-
-      -- Subtraction -> v - 1
-      DffOneHot0 := Build_Dyadic (Ctxt, Id_Sub, DffCurr, DffOne);
-      Set_Location (DffOneHot0, Call);
-
-      -- Binary And -> v & (v - 1)
-      DffOneHot0 := Build_Dyadic (Ctxt, Id_And, DffCurr, DffOneHot0);
-      Set_Location (DffOneHot0, Call);
-
-      -- Compare with 0 -> (v & (v - 1)) == 0
-      Res := Build_Compare (Ctxt, Id_Eq, DffOneHot0, DffZero);
-      Set_Location (Res, Call);
-
-      return Res;
-   end Synth_Onehot0;
-
-   function Synth_Psl_Onehot (Syn_Inst : Synth_Instance_Acc; Call : Node)
-                              return Valtyp
-   is
-      Ctxt             : constant Context_Acc := Get_Build (Syn_Inst);
-      Expr             : Valtyp;
-      DffCurr          : Net;
-      DffCurrIsNotZero : Net;
-      DffOneHot0       : Net;
-      Res              : Net;
-      Vlen             : Uns32;
-   begin
-      -- Get parameter & its length
-      Expr := Synth_Expression (Syn_Inst, Get_Expression (Call));
-      Vlen := Expr.Typ.W;
-
-      -- First get net of parameter
-      DffCurr := Get_Net (Ctxt, Expr);
-      Set_Location (DffCurr, Call);
-
-      -- Compare parameter with 0 -> v != 0
-      DffCurrIsNotZero := Build_Compare (Ctxt, Id_Ne, DffCurr,
-                                         Build2_Const_Uns(Ctxt, 0, Vlen));
-      Set_Location (DffCurrIsNotZero, Call);
-
-      -- Synth onehot0
-      DffOneHot0 := Synth_Onehot0 (Ctxt, DffCurr, Call, Vlen);
-      Set_Location (DffOneHot0, Call);
-
-      -- Final Binary And -> (v != 0) & ((v & (v - 1)) == 0)
-      Res := Build_Dyadic (Ctxt, Id_And, DffOneHot0, DffCurrIsNotZero);
-      Set_Location (Res, Call);
-
-      return Create_Value_Net (Res, Boolean_Type);
-   end Synth_Psl_Onehot;
-
-   function Synth_Psl_Onehot0 (Syn_Inst : Synth_Instance_Acc; Call : Node)
-                               return Valtyp
-   is
-      Ctxt    : constant Context_Acc := Get_Build (Syn_Inst);
-      Expr    : Valtyp;
-      Vlen    : Uns32;
-      DffCurr : Net;
-      Res     : Net;
-   begin
-      -- Get parameter & its length
-      Expr := Synth_Expression (Syn_Inst, Get_Expression (Call));
-      Vlen := Expr.Typ.W;
-
-      -- First get net of parameter
-      DffCurr := Get_Net (Ctxt, Expr);
-      Set_Location (DffCurr, Call);
-
-      -- Synth onehot0
-      Res := Synth_Onehot0 (Ctxt, DffCurr, Call, Vlen);
-
-      return Create_Value_Net (Res, Boolean_Type);
-   end Synth_Psl_Onehot0;
-
-   subtype And_Or_Module_Id is Module_Id range Id_And .. Id_Or;
-
-   function Synth_Short_Circuit (Syn_Inst : Synth_Instance_Acc;
-                                 Id : And_Or_Module_Id;
-                                 Left_Expr : Node;
-                                 Right_Expr : Node;
-                                 Typ : Type_Acc;
-                                 Expr : Node) return Valtyp
-   is
-      Ctxt : constant Context_Acc := Get_Build (Syn_Inst);
-      Left : Valtyp;
-      Right : Valtyp;
-      Val : Int64;
-      N : Net;
-   begin
-      --  The short-circuit value.
-      case Id is
-         when Id_And =>
-            Val := 0;
-         when Id_Or =>
-            Val := 1;
-      end case;
-
-      Left := Synth_Expression_With_Type (Syn_Inst, Left_Expr, Typ);
-      if Left = No_Valtyp then
-         --  Propagate error.
-         return No_Valtyp;
-      end if;
-      if Is_Static_Val (Left.Val)
-        and then Get_Static_Discrete (Left) = Val
-      then
-         --  Short-circuit when the left operand determines the result.
-         return Create_Value_Discrete (Val, Boolean_Type);
-      end if;
-
-      Strip_Const (Left);
-      Right := Synth_Expression_With_Type (Syn_Inst, Right_Expr, Typ);
-      if Right = No_Valtyp then
-         --  Propagate error.
-         return No_Valtyp;
-      end if;
-      Strip_Const (Right);
-
-      if Is_Static_Val (Right.Val)
-        and then Get_Static_Discrete (Right) = Val
-      then
-         --  If the right operand can determine the result, return it.
-         return Create_Value_Discrete (Val, Boolean_Type);
-      end if;
-
-      --  Return a static value if both operands are static.
-      --  Note: we know the value of left if it is not constant.
-      if Is_Static_Val (Left.Val) and then Is_Static_Val (Right.Val) then
-         Val := Get_Static_Discrete (Right);
-         return Create_Value_Discrete (Val, Boolean_Type);
-      end if;
-
-      --  Non-static result.
-      N := Build_Dyadic (Ctxt, Id,
-                         Get_Net (Ctxt, Left), Get_Net (Ctxt, Right));
-      Set_Location (N, Expr);
-      return Create_Value_Net (N, Boolean_Type);
-   end Synth_Short_Circuit;
-
-   function Synth_Expression_With_Type (Syn_Inst : Synth_Instance_Acc;
-                                        Expr : Node;
-                                        Expr_Type : Type_Acc) return Valtyp is
-   begin
-      case Get_Kind (Expr) is
-         when Iir_Kinds_Dyadic_Operator =>
-            declare
-               Imp : constant Node := Get_Implementation (Expr);
-               Def : constant Iir_Predefined_Functions :=
-                 Get_Implicit_Definition (Imp);
-               Edge : Net;
-            begin
-               --  Match clock-edge
-               if Def = Iir_Predefined_Boolean_And then
-                  Edge := Synth_Clock_Edge (Syn_Inst,
-                                            Get_Left (Expr), Get_Right (Expr));
-                  if Edge /= No_Net then
-                     return Create_Value_Net (Edge, Boolean_Type);
-                  end if;
-               end if;
-
-               --  Specially handle short-circuit operators.
-               case Def is
-                  when Iir_Predefined_Boolean_And =>
-                     return Synth_Short_Circuit
-                       (Syn_Inst, Id_And, Get_Left (Expr), Get_Right (Expr),
-                        Boolean_Type, Expr);
-                  when Iir_Predefined_Boolean_Or =>
-                     return Synth_Short_Circuit
-                       (Syn_Inst, Id_Or, Get_Left (Expr), Get_Right (Expr),
-                        Boolean_Type, Expr);
-                  when Iir_Predefined_Bit_And =>
-                     return Synth_Short_Circuit
-                       (Syn_Inst, Id_And, Get_Left (Expr), Get_Right (Expr),
-                        Bit_Type, Expr);
-                  when Iir_Predefined_Bit_Or =>
-                     return Synth_Short_Circuit
-                       (Syn_Inst, Id_Or, Get_Left (Expr), Get_Right (Expr),
-                        Bit_Type, Expr);
-                  when Iir_Predefined_None =>
-                     if Error_Ieee_Operator (Imp, Expr) then
-                        return No_Valtyp;
-                     else
-                        return Synth_User_Operator
-                          (Syn_Inst, Get_Left (Expr), Get_Right (Expr), Expr);
-                     end if;
-                  when others =>
-                     return Synth_Dyadic_Operation
-                       (Syn_Inst, Imp,
-                        Get_Left (Expr), Get_Right (Expr), Expr);
-               end case;
-            end;
-         when Iir_Kinds_Monadic_Operator =>
-            declare
-               Imp : constant Node := Get_Implementation (Expr);
-               Def : constant Iir_Predefined_Functions :=
-                 Get_Implicit_Definition (Imp);
-            begin
-               if Def = Iir_Predefined_None then
-                  if Error_Ieee_Operator (Imp, Expr) then
-                     return No_Valtyp;
-                  else
-                     return Synth_User_Operator
-                       (Syn_Inst, Get_Operand (Expr), Null_Node, Expr);
-                  end if;
-               else
-                  return Synth_Monadic_Operation
-                    (Syn_Inst, Imp, Get_Operand (Expr), Expr);
-               end if;
-            end;
-         when Iir_Kind_Simple_Name
-            | Iir_Kind_Selected_Name
-            | Iir_Kind_Interface_Signal_Declaration --  For PSL.
-            | Iir_Kind_Signal_Declaration   -- For PSL.
-            | Iir_Kind_Implicit_Dereference
-            | Iir_Kind_Dereference =>
-            declare
-               Res : Valtyp;
-            begin
-               Res := Synth_Name (Syn_Inst, Expr);
-               if Res.Typ.W = 0 and then Res.Val.Kind /= Value_Memory then
-                  --  This is a null object.  As nothing can be done about it,
-                  --  returns 0.
-                  return Create_Value_Memtyp (Create_Memory_Zero (Res.Typ));
-               end if;
-               return Res;
-            end;
-         when Iir_Kind_Reference_Name =>
-            --  Only used for anonymous signals in internal association.
-            return Synth_Expression_With_Type
-              (Syn_Inst, Get_Named_Entity (Expr), Expr_Type);
-         when Iir_Kind_Anonymous_Signal_Declaration =>
-            return Synth_Expression_With_Type
-              (Syn_Inst, Get_Expression (Expr), Expr_Type);
-         when Iir_Kind_Indexed_Name
-           | Iir_Kind_Slice_Name =>
-            declare
-               Base : Valtyp;
-               Typ : Type_Acc;
-               Off : Value_Offsets;
-               Res : Valtyp;
-
-               Dyn : Dyn_Name;
-            begin
-               Synth_Assignment_Prefix (Syn_Inst, Expr, Base, Typ, Off, Dyn);
-               if Dyn.Voff = No_Net and then Is_Static (Base.Val) then
-                  Res := Create_Value_Memory (Typ);
-                  Copy_Memory
-                    (Res.Val.Mem, Base.Val.Mem + Off.Mem_Off, Typ.Sz);
-                  return Res;
-               end if;
-               return Synth_Read_Memory
-                 (Syn_Inst, Base, Typ, Off.Net_Off, Dyn, Expr);
-            end;
-         when Iir_Kind_Selected_Element =>
-            declare
-               Ctxt : constant Context_Acc := Get_Build (Syn_Inst);
-               Idx : constant Iir_Index32 :=
-                 Get_Element_Position (Get_Named_Entity (Expr));
-               Pfx : constant Node := Get_Prefix (Expr);
-               Res_Typ : Type_Acc;
-               N : Net;
-               Val : Valtyp;
-               Res : Valtyp;
-            begin
-               Val := Synth_Expression (Syn_Inst, Pfx);
-               Strip_Const (Val);
-               Res_Typ := Val.Typ.Rec.E (Idx + 1).Typ;
-               if Res_Typ.W = 0 and then Val.Val.Kind /= Value_Memory then
-                  --  This is a null object.  As nothing can be done about it,
-                  --  returns 0.
-                  return Create_Value_Memtyp (Create_Memory_Zero (Res_Typ));
-               elsif Is_Static (Val.Val) then
-                  Res := Create_Value_Memory (Res_Typ);
-                  Copy_Memory
-                    (Res.Val.Mem, Val.Val.Mem + Val.Typ.Rec.E (Idx + 1).Moff,
-                     Res_Typ.Sz);
-                  return Res;
-               else
-                  N := Build_Extract
-                    (Ctxt, Get_Net (Ctxt, Val),
-                     Val.Typ.Rec.E (Idx + 1).Boff, Get_Type_Width (Res_Typ));
-                  Set_Location (N, Expr);
-                  return Create_Value_Net (N, Res_Typ);
-               end if;
-            end;
-         when Iir_Kind_Character_Literal =>
-            return Synth_Expression_With_Type
-              (Syn_Inst, Get_Named_Entity (Expr), Expr_Type);
-         when Iir_Kind_Integer_Literal =>
-            declare
-               Res : Valtyp;
-            begin
-               Res := Create_Value_Memory (Expr_Type);
-               Write_Discrete (Res, Get_Value (Expr));
-               return Res;
-            end;
-         when Iir_Kind_Floating_Point_Literal =>
-            return Create_Value_Float (Get_Fp_Value (Expr), Expr_Type);
-         when Iir_Kind_Physical_Int_Literal
-           | Iir_Kind_Physical_Fp_Literal =>
-            return Create_Value_Discrete
-              (Get_Physical_Value (Expr), Expr_Type);
-         when Iir_Kind_String_Literal8 =>
-            return Synth_String_Literal (Syn_Inst, Expr, Expr_Type);
-         when Iir_Kind_Enumeration_Literal =>
-            return Synth_Name (Syn_Inst, Expr);
-         when Iir_Kind_Type_Conversion =>
-            return Synth_Type_Conversion (Syn_Inst, Expr);
-         when Iir_Kind_Qualified_Expression =>
-            return Synth_Expression_With_Type
-              (Syn_Inst, Get_Expression (Expr),
-               Get_Subtype_Object (Syn_Inst, Get_Type (Get_Type_Mark (Expr))));
-         when Iir_Kind_Function_Call =>
-            declare
-               Imp : constant Node := Get_Implementation (Expr);
-            begin
-               case Get_Implicit_Definition (Imp) is
-                  when Iir_Predefined_Pure_Functions
-                     | Iir_Predefined_Ieee_Numeric_Std_Binary_Operators =>
-                     return Synth_Operator_Function_Call (Syn_Inst, Expr);
-                  when Iir_Predefined_None =>
-                     return Synth_User_Function_Call (Syn_Inst, Expr);
-                  when others =>
-                     return Synth_Predefined_Function_Call (Syn_Inst, Expr);
-               end case;
-            end;
-         when Iir_Kind_Aggregate =>
-            return Synth.Vhdl_Aggr.Synth_Aggregate (Syn_Inst, Expr, Expr_Type);
-         when Iir_Kind_Simple_Aggregate =>
-            return Synth_Simple_Aggregate (Syn_Inst, Expr);
-         when Iir_Kind_Parenthesis_Expression =>
-            return Synth_Expression_With_Type
-              (Syn_Inst, Get_Expression (Expr), Expr_Type);
-         when Iir_Kind_Left_Array_Attribute =>
-            declare
-               B : Bound_Type;
-            begin
-               B := Synth_Array_Attribute (Syn_Inst, Expr);
-               return Create_Value_Discrete (Int64 (B.Left), Expr_Type);
-            end;
-         when Iir_Kind_Right_Array_Attribute =>
-            declare
-               B : Bound_Type;
-            begin
-               B := Synth_Array_Attribute (Syn_Inst, Expr);
-               return Create_Value_Discrete (Int64 (B.Right), Expr_Type);
-            end;
-         when Iir_Kind_High_Array_Attribute =>
-            declare
-               B : Bound_Type;
-               V : Int32;
-            begin
-               B := Synth_Array_Attribute (Syn_Inst, Expr);
-               case B.Dir is
-                  when Dir_To =>
-                     V := B.Right;
-                  when Dir_Downto =>
-                     V := B.Left;
-               end case;
-               return Create_Value_Discrete (Int64 (V), Expr_Type);
-            end;
-         when Iir_Kind_Low_Array_Attribute =>
-            declare
-               B : Bound_Type;
-               V : Int32;
-            begin
-               B := Synth_Array_Attribute (Syn_Inst, Expr);
-               case B.Dir is
-                  when Dir_To =>
-                     V := B.Left;
-                  when Dir_Downto =>
-                     V := B.Right;
-               end case;
-               return Create_Value_Discrete (Int64 (V), Expr_Type);
-            end;
-         when Iir_Kind_Length_Array_Attribute =>
-            declare
-               B : Bound_Type;
-            begin
-               B := Synth_Array_Attribute (Syn_Inst, Expr);
-               return Create_Value_Discrete (Int64 (B.Len), Expr_Type);
-            end;
-         when Iir_Kind_Ascending_Array_Attribute =>
-            declare
-               B : Bound_Type;
-               V : Int64;
-            begin
-               B := Synth_Array_Attribute (Syn_Inst, Expr);
-               case B.Dir is
-                  when Dir_To =>
-                     V := 1;
-                  when Dir_Downto =>
-                     V := 0;
-               end case;
-               return Create_Value_Discrete (V, Expr_Type);
-            end;
-
-         when Iir_Kind_Pos_Attribute
-           | Iir_Kind_Val_Attribute =>
-            declare
-               Ctxt : constant Context_Acc := Get_Build (Syn_Inst);
-               Param : constant Node := Get_Parameter (Expr);
-               V : Valtyp;
-               Dtype : Type_Acc;
-            begin
-               V := Synth_Expression (Syn_Inst, Param);
-               Dtype := Get_Subtype_Object (Syn_Inst, Get_Type (Expr));
-               --  FIXME: to be generalized.  Not always as simple as a
-               --  subtype conversion.
-               return Synth_Subtype_Conversion (Ctxt, V, Dtype, False, Expr);
-            end;
-         when Iir_Kind_Low_Type_Attribute =>
-            return Synth_Low_High_Type_Attribute (Syn_Inst, Expr, Dir_To);
-         when Iir_Kind_High_Type_Attribute =>
-            return Synth_Low_High_Type_Attribute (Syn_Inst, Expr, Dir_Downto);
-         when Iir_Kind_Value_Attribute =>
-            return Synth_Value_Attribute (Syn_Inst, Expr);
-         when Iir_Kind_Image_Attribute =>
-            return Synth_Image_Attribute (Syn_Inst, Expr);
-         when Iir_Kind_Instance_Name_Attribute =>
-            return Synth_Instance_Name_Attribute (Syn_Inst, Expr);
-         when Iir_Kind_Null_Literal =>
-            return Create_Value_Access (Null_Heap_Index, Expr_Type);
-         when Iir_Kind_Allocator_By_Subtype =>
-            declare
-               T : Type_Acc;
-               Acc : Heap_Index;
-            begin
-               T := Synth.Decls.Synth_Subtype_Indication
-                 (Syn_Inst, Get_Subtype_Indication (Expr));
-               Acc := Allocate_By_Type (T);
-               return Create_Value_Access (Acc, Expr_Type);
-            end;
-         when Iir_Kind_Allocator_By_Expression =>
-            declare
-               V : Valtyp;
-               Acc : Heap_Index;
-            begin
-               V := Synth_Expression_With_Type
-                 (Syn_Inst, Get_Expression (Expr), Expr_Type.Acc_Acc);
-               Acc := Allocate_By_Value (V);
-               return Create_Value_Access (Acc, Expr_Type);
-            end;
-         when Iir_Kind_Stable_Attribute =>
-            Error_Msg_Synth (+Expr, "signal attribute not supported");
-            return No_Valtyp;
-         when Iir_Kind_Psl_Prev =>
-            return Synth_Psl_Prev (Syn_Inst, Expr);
-         when Iir_Kind_Psl_Stable =>
-            return Synth_Psl_Stable (Syn_Inst, Expr);
-         when Iir_Kind_Psl_Rose =>
-            return Synth_Psl_Rose(Syn_Inst, Expr);
-         when Iir_Kind_Psl_Fell =>
-            return Synth_Psl_Fell(Syn_Inst, Expr);
-         when Iir_Kind_Psl_Onehot =>
-            return Synth_Psl_Onehot(Syn_Inst, Expr);
-         when Iir_Kind_Psl_Onehot0 =>
-            return Synth_Psl_Onehot0(Syn_Inst, Expr);
-         when Iir_Kind_Overflow_Literal =>
-            Error_Msg_Synth (+Expr, "out of bound expression");
-            return No_Valtyp;
-         when others =>
-            Error_Kind ("synth_expression_with_type", Expr);
-      end case;
-   end Synth_Expression_With_Type;
-
-   function Synth_Expression (Syn_Inst : Synth_Instance_Acc; Expr : Node)
-                             return Valtyp
-   is
-      Etype : Node;
-   begin
-      Etype := Get_Type (Expr);
-
-      case Get_Kind (Expr) is
-         when Iir_Kind_High_Array_Attribute
-           |  Iir_Kind_Low_Array_Attribute
-           |  Iir_Kind_Integer_Literal =>
-            --  The type of this attribute is the type of the index, which is
-            --  not synthesized as atype (only as an index).
-            --  For integer_literal, the type is not really needed, and it
-            --  may be created by static evaluation of an array attribute.
-            Etype := Get_Base_Type (Etype);
-         when others =>
-            null;
-      end case;
-
-      return Synth_Expression_With_Type
-        (Syn_Inst, Expr, Get_Subtype_Object (Syn_Inst, Etype));
-   end Synth_Expression;
-
-   function Synth_Expression_With_Basetype
-     (Syn_Inst : Synth_Instance_Acc; Expr : Node) return Valtyp
-   is
-      Basetype : Type_Acc;
-   begin
-      Basetype := Get_Subtype_Object
-        (Syn_Inst, Get_Base_Type (Get_Type (Expr)));
-      return Synth_Expression_With_Type (Syn_Inst, Expr, Basetype);
-   end Synth_Expression_With_Basetype;
-end Synth.Expr;