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--  GHDL Run Time (GRT) - signals management.
--  Copyright (C) 2002 - 2014 Tristan Gingold
--
--  GHDL is free software; you can redistribute it and/or modify it under
--  the terms of the GNU General Public License as published by the Free
--  Software Foundation; either version 2, or (at your option) any later
--  version.
--
--  GHDL is distributed in the hope that it will be useful, but WITHOUT ANY
--  WARRANTY; without even the implied warranty of MERCHANTABILITY or
--  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
--  for more details.
--
--  You should have received a copy of the GNU General Public License
--  along with GCC; see the file COPYING.  If not, write to the Free
--  Software Foundation, 59 Temple Place - Suite 330, Boston, MA
--  02111-1307, USA.
--
--  As a special exception, if other files instantiate generics from this
--  unit, or you link this unit with other files to produce an executable,
--  this unit does not by itself cause the resulting executable to be
--  covered by the GNU General Public License. This exception does not
--  however invalidate any other reasons why the executable file might be
--  covered by the GNU Public License.
with System; use System;
with System.Storage_Elements; --  Work around GNAT bug.
pragma Unreferenced (System.Storage_Elements);
with Ada.Unchecked_Deallocation;

with Grt.Errors; use Grt.Errors;
with Grt.Errors_Exec; use Grt.Errors_Exec;
with Grt.Processes; use Grt.Processes;
with Grt.Options; use Grt.Options;
with Grt.Disp_Signals;
with Grt.Astdio;
with Grt.Stdio;
with Grt.Threads; use Grt.Threads;

package body Grt.Signals is
   procedure Free is new Ada.Unchecked_Deallocation
     (Object => Transaction, Name => Transaction_Acc);

   procedure Free_In (Trans : Transaction_Acc)
   is
      Ntrans : Transaction_Acc;
   begin
      Ntrans := Trans;
      Free (Ntrans);
   end Free_In;
   pragma Inline (Free_In);

   --  Signal mode (and flags) for the current signal.
   Sig_Mode : Mode_Signal_Type;
   Sig_Has_Active : Boolean;
   Sig_Kind : Kind_Signal_Type;

   --  Last created implicit signal.  This is used to add dependencies on
   --  the prefix.
   Last_Implicit_Signal : Ghdl_Signal_Ptr;

   --  Current signal resolver.
   Current_Resolv : Resolved_Signal_Acc := null;

   function Get_Current_Mode_Signal return Mode_Signal_Type is
   begin
      return Sig_Mode;
   end Get_Current_Mode_Signal;

   procedure Assign
     (Targ : out Value_Union; Val : Ghdl_Value_Ptr; Mode : Mode_Type) is
   begin
      case Mode is
         when Mode_B1 =>
            Targ.B1 := Val.B1;
         when Mode_E8 =>
            Targ.E8 := Val.E8;
         when Mode_E32 =>
            Targ.E32 := Val.E32;
         when Mode_I32 =>
            Targ.I32 := Val.I32;
         when Mode_I64 =>
            Targ.I64 := Val.I64;
         when Mode_F64 =>
            Targ.F64 := Val.F64;
      end case;
   end Assign;

   function Read_Value (Value_Ptr : Ghdl_Value_Ptr; Mode : Mode_Type)
     return Value_Union is
   begin
      case Mode is
         when Mode_B1 =>
            return (Mode => Mode_B1, B1 => Value_Ptr.B1);
         when Mode_E8 =>
            return (Mode => Mode_E8, E8 => Value_Ptr.E8);
         when Mode_E32 =>
            return (Mode => Mode_E32, E32 => Value_Ptr.E32);
         when Mode_I32 =>
            return (Mode => Mode_I32, I32 => Value_Ptr.I32);
         when Mode_I64 =>
            return (Mode => Mode_I64, I64 => Value_Ptr.I64);
         when Mode_F64 =>
            return (Mode => Mode_F64, F64 => Value_Ptr.F64);
      end case;
   end Read_Value;

   --  For direct drivers, only a pointer is available and it may not be
   --  aligned.  Hence this version of Assign.
   procedure Assign
     (Targ : Ghdl_Value_Ptr; Val : Ghdl_Value_Ptr; Mode : Mode_Type) is
   begin
      case Mode is
         when Mode_B1 =>
            Targ.B1 := Val.B1;
         when Mode_E8 =>
            Targ.E8 := Val.E8;
         when Mode_E32 =>
            Targ.E32 := Val.E32;
         when Mode_I32 =>
            Targ.I32 := Val.I32;
         when Mode_I64 =>
            Targ.I64 := Val.I64;
         when Mode_F64 =>
            Targ.F64 := Val.F64;
      end case;
   end Assign;

   procedure Ghdl_Signal_Name_Rti (Sig : Ghdl_Rti_Access;
                                   Ctxt : Ghdl_Rti_Access;
                                   Addr : Address)
   is
      pragma Unreferenced (Ctxt);
      pragma Unreferenced (Addr);

      Sig_Rti : constant Ghdl_Rtin_Object_Acc := To_Ghdl_Rtin_Object_Acc (Sig);
   begin
      Sig_Mode := Mode_Signal_Type'Val
        (Sig.Mode and Ghdl_Rti_Signal_Mode_Mask);
      Sig_Kind := Kind_Signal_Type'Val
        ((Sig.Mode and Ghdl_Rti_Signal_Kind_Mask)
         / Ghdl_Rti_Signal_Kind_Offset);
      Sig_Has_Active :=
        (Sig_Rti.Common.Mode and Ghdl_Rti_Signal_Has_Active) /= 0;
   end Ghdl_Signal_Name_Rti;

   procedure Ghdl_Signal_Set_Mode (Mode : Mode_Signal_Type;
                                   Kind : Kind_Signal_Type;
                                   Has_Active : Boolean) is
   begin
      Sig_Mode := Mode;
      Sig_Kind := Kind;
      Sig_Has_Active := Has_Active;
   end Ghdl_Signal_Set_Mode;

   function Is_Signal_Guarded (Sig : Ghdl_Signal_Ptr) return Boolean is
   begin
      return Sig.Flags.Sig_Kind /= Kind_Signal_No;
   end Is_Signal_Guarded;

   function To_Address is new Ada.Unchecked_Conversion
     (Source => Ghdl_Signal_Ptr, Target => Address);

   function Create_Signal
     (Mode : Mode_Type;
      Value_Ptr : Ghdl_Value_Ptr;
      Mode_Sig : Mode_Signal_Type;
      Resolv_Proc : Resolver_Acc;
      Resolv_Inst : System.Address)
     return Ghdl_Signal_Ptr
   is
      Res : Ghdl_Signal_Ptr;
      Resolv : Resolved_Signal_Acc;
      S : Ghdl_Signal_Data (Mode_Sig);
      Init_Val : Value_Union;
   begin
      Sig_Table.Increment_Last;

      if Current_Resolv = null then
         if Resolv_Proc /= null then
            Resolv := new Resolved_Signal_Type'
              (Resolv_Proc => Resolv_Proc,
               Resolv_Inst => Resolv_Inst,
               Resolv_Ptr => Null_Address,
               Sig_Range => (Sig_Table.Last, Sig_Table.Last),
               Disconnect_Time => Bad_Time);
         else
            Resolv := null;
         end if;
      else
         if Resolv_Proc /= null then
            --  Only one resolution function is allowed!
            Internal_Error ("create_signal");
         end if;
         Resolv := Current_Resolv;
         if Current_Resolv.Sig_Range.Last = Sig_Table.Last then
            Current_Resolv := null;
         end if;
      end if;

      case Mode_Sig is
         when Mode_Signal_User =>
            S.Nbr_Drivers := 0;
            S.Drivers := null;
            S.Effective := null;
            S.Resolv := Resolv;
         when Mode_Conv_In
           | Mode_Conv_Out =>
            S.Conv := null;
         when Mode_Stable
           | Mode_Quiet
           | Mode_Delayed =>
            S.Time := 0;
         when Mode_Guard =>
            S.Guard_Func := null;
            S.Guard_Instance := System.Null_Address;
         when Mode_Transaction
           | Mode_End =>
            null;
      end case;

      Init_Val := Read_Value (Value_Ptr, Mode);
      Res := new Ghdl_Signal'(Value_Ptr => Value_Ptr,
                              Driving_Value => Init_Val,
                              Last_Value => Init_Val,
                              --  Note: use -Std_Time'last instead of
                              --  Std_Time'First so that NOW - x'last_event
                              --  returns time'high at initialization!
                              Last_Event => -Std_Time'Last,
                              Last_Active => -Std_Time'Last,
                              Event => False,
                              Active => False,
                              Has_Active => False,

                              Mode => Mode,
                              Flags => (Propag => Propag_None,
                                        Sig_Kind => Sig_Kind,
                                        Is_Direct_Active => False,
                                        Is_Dumped => False,
                                        RO_Event => False,
                                        Implicit_Active_Next => False,
                                        Seen => False),

                              Net => No_Signal_Net,
                              Link => null,
                              Alink => null,
                              Flink => null,

                              Event_List => null,

                              Nbr_Ports => 0,
                              Ports => null,

                              S => S);

      if Resolv /= null and then Resolv.Resolv_Ptr = System.Null_Address then
         Resolv.Resolv_Ptr := To_Address (Res);
      end if;

      case Flag_Activity is
         when Activity_All =>
            Res.Has_Active := True;
         when Activity_Minimal =>
            Res.Has_Active := Sig_Has_Active;
         when Activity_None =>
            Res.Has_Active := False;
      end case;

      --  Put the signal in the table.
      Sig_Table.Table (Sig_Table.Last) := Res;

      return Res;
   end Create_Signal;

   procedure Ghdl_Signal_Init (Sig : Ghdl_Signal_Ptr; Val : Value_Union) is
   begin
      Sig.Driving_Value := Val;
      Sig.Last_Value := Val;
   end Ghdl_Signal_Init;

   procedure Ghdl_Signal_Merge_Rti (Sig : Ghdl_Signal_Ptr;
                                    Rti : Ghdl_Rti_Access)
   is
      S_Rti : constant Ghdl_Rtin_Object_Acc := To_Ghdl_Rtin_Object_Acc (Rti);
   begin
      if Flag_Activity = Activity_Minimal then
         if (S_Rti.Common.Mode and Ghdl_Rti_Signal_Has_Active) /= 0 then
            Sig.Has_Active := True;
         end if;
      end if;
   end Ghdl_Signal_Merge_Rti;

   procedure Ghdl_Signal_Create_Resolution (Proc : Resolver_Acc;
                                            Instance : System.Address;
                                            Sig : System.Address;
                                            Nbr_Sig : Ghdl_Index_Type)
   is
   begin
      if Current_Resolv /= null then
         Internal_Error ("Ghdl_Signal_Create_Resolution");
      end if;
      Current_Resolv := new Resolved_Signal_Type'
        (Resolv_Proc => Proc,
         Resolv_Inst => Instance,
         Resolv_Ptr => Sig,
         Sig_Range => (First => Sig_Table.Last + 1,
                       Last => Sig_Table.Last + Sig_Table_Index (Nbr_Sig)),
         Disconnect_Time => Bad_Time);
   end Ghdl_Signal_Create_Resolution;

   procedure Check_New_Source (Sig : Ghdl_Signal_Ptr)
   is
      use Grt.Stdio;
      use Grt.Astdio;
   begin
      if Sig.S.Nbr_Drivers + Sig.Nbr_Ports > 0 then
         if Sig.S.Resolv = null then
            --  LRM 4.3.1.2 Signal Declaration
            --  It is an error if, after the elaboration of a description, a
            --  signal has multiple sources and it is not a resolved signal.
            Put (stderr, "for signal: ");
            Disp_Signals.Put_Signal_Name (stderr, Sig);
            New_Line (stderr);
            Error ("several sources for unresolved signal");
         elsif Sig.S.Mode_Sig = Mode_Buffer and False then
            --  LRM 1.1.1.2  Ports
            --  A BUFFER port may have at most one source.

            --  FIXME: this is not true with VHDL-02.
            --  With VHDL-87/93, should also check that: any actual associated
            --  with a formal buffer port may have at most one source.
            Error ("buffer port which more than one source");
         end if;
      end if;
   end Check_New_Source;

   --  Return TRUE if already present.
   function Ghdl_Signal_Add_Driver (Sign : Ghdl_Signal_Ptr;
                                    Trans : Transaction_Acc)
                                   return Boolean
   is
      Proc : constant Process_Acc := Get_Current_Process;

      type Size_T is mod 2**Standard'Address_Size;

      function Malloc (Size : Size_T) return Driver_Arr_Ptr;
      pragma Import (C, Malloc);

      function Realloc (Ptr : Driver_Arr_Ptr; Size : Size_T)
        return Driver_Arr_Ptr;
      pragma Import (C, Realloc);

      function Size (N : Ghdl_Index_Type) return Size_T is
      begin
         return Size_T (N * Driver_Fat_Array'Component_Size
                        / System.Storage_Unit);
      end Size;
   begin
      if Sign.S.Nbr_Drivers = 0 then
         Check_New_Source (Sign);
         Sign.S.Drivers := Malloc (Size (1));
         Sign.S.Nbr_Drivers := 1;
      else
         -- Do not create a driver twice.
         for I in 0 .. Sign.S.Nbr_Drivers - 1 loop
            if Sign.S.Drivers (I).Proc = Proc then
               return True;
            end if;
         end loop;
         Check_New_Source (Sign);
         Sign.S.Nbr_Drivers := Sign.S.Nbr_Drivers + 1;
         Sign.S.Drivers := Realloc (Sign.S.Drivers, Size (Sign.S.Nbr_Drivers));
      end if;
      Sign.S.Drivers (Sign.S.Nbr_Drivers - 1) :=
        (First_Trans => Trans,
         Last_Trans => Trans,
         Proc => Proc);
      return False;
   end Ghdl_Signal_Add_Driver;

   procedure Ghdl_Process_Add_Driver (Sign : Ghdl_Signal_Ptr)
   is
      Trans : Transaction_Acc;
   begin
      Trans := new Transaction'(Kind => Trans_Value,
                                Line => 0,
                                Time => 0,
                                Next => null,
                                Val => Read_Value (Sign.Value_Ptr, Sign.Mode));
      if Ghdl_Signal_Add_Driver (Sign, Trans) then
         Free (Trans);
      end if;
   end Ghdl_Process_Add_Driver;

   procedure Ghdl_Process_Add_Port_Driver
     (Sign : Ghdl_Signal_Ptr; Val : Value_Union)
   is
      Trans : Transaction_Acc;
   begin
      Trans := new Transaction'(Kind => Trans_Value,
                                Line => 0,
                                Time => 0,
                                Next => null,
                                Val => Val);
      if Ghdl_Signal_Add_Driver (Sign, Trans) then
         Free (Trans);
      end if;
   end Ghdl_Process_Add_Port_Driver;

   procedure Ghdl_Signal_Add_Direct_Driver (Sign : Ghdl_Signal_Ptr;
                                            Drv : Ghdl_Value_Ptr)
   is
      Trans : Transaction_Acc;
      Trans1 : Transaction_Acc;
   begin
      --  Create transaction for current driving value.
      Trans := new Transaction'(Kind => Trans_Value,
                                Line => 0,
                                Time => 0,
                                Next => null,
                                Val => Read_Value (Drv, Sign.Mode));
      if Ghdl_Signal_Add_Driver (Sign, Trans) then
         Free (Trans);
         return;
      end if;
      --  Create transaction for the next driving value.
      Trans1 := new Transaction'(Kind => Trans_Direct,
                                 Line => 0,
                                 Time => 0,
                                 Next => null,
                                 Val_Ptr => Drv);
      Sign.S.Drivers (Sign.S.Nbr_Drivers - 1).Last_Trans := Trans1;
      Trans.Next := Trans1;
   end Ghdl_Signal_Add_Direct_Driver;

   procedure Append_Port (Targ : Ghdl_Signal_Ptr; Src : Ghdl_Signal_Ptr)
   is
      type Size_T is new Integer;

      function Malloc (Size : Size_T) return Signal_Arr_Ptr;
      pragma Import (C, Malloc);

      function Realloc (Ptr : Signal_Arr_Ptr; Size : Size_T)
        return Signal_Arr_Ptr;
      pragma Import (C, Realloc);

      function Size (N : Ghdl_Index_Type) return Size_T is
      begin
         return Size_T (N * Ghdl_Signal_Ptr'Size / System.Storage_Unit);
      end Size;
   begin
      if Targ.Nbr_Ports = 0 then
         Targ.Ports := Malloc (Size (1));
         Targ.Nbr_Ports := 1;
      else
         Targ.Nbr_Ports := Targ.Nbr_Ports + 1;
         Targ.Ports := Realloc (Targ.Ports, Size (Targ.Nbr_Ports));
      end if;
      Targ.Ports (Targ.Nbr_Ports - 1) := Src;
   end Append_Port;

   --  Add SRC to port list of TARG, but only if not already in this list.
   procedure Add_Port (Targ : Ghdl_Signal_Ptr; Src : Ghdl_Signal_Ptr)
   is
   begin
      for I in 1 .. Targ.Nbr_Ports loop
         if Targ.Ports (I - 1) = Src then
            return;
         end if;
      end loop;
      Append_Port (Targ, Src);
   end Add_Port;

   procedure Ghdl_Signal_Add_Source (Targ : Ghdl_Signal_Ptr;
                                     Src : Ghdl_Signal_Ptr)
   is
   begin
      Check_New_Source (Targ);
      Append_Port (Targ, Src);
   end Ghdl_Signal_Add_Source;

   procedure Ghdl_Signal_Set_Disconnect (Sign : Ghdl_Signal_Ptr;
                                         Time : Std_Time) is
   begin
      if Sign.S.Resolv = null then
         Internal_Error ("ghdl_signal_set_disconnect: not resolved");
      end if;
      if Sign.S.Resolv.Disconnect_Time /= Bad_Time then
         Error ("disconnection already specified for signal");
      end if;
      if Time < 0 then
         Error ("disconnection time is negative");
      end if;
      Sign.S.Resolv.Disconnect_Time := Time;
   end Ghdl_Signal_Set_Disconnect;

   function Value_Equal (Left, Right : Value_Union; Mode : Mode_Type)
     return Boolean
   is
   begin
      case Mode is
         when Mode_B1 =>
            return Left.B1 = Right.B1;
         when Mode_E8 =>
            return Left.E8 = Right.E8;
         when Mode_E32 =>
            return Left.E32 = Right.E32;
         when Mode_I32 =>
            return Left.I32 = Right.I32;
         when Mode_I64 =>
            return Left.I64 = Right.I64;
         when Mode_F64 =>
            return Left.F64 = Right.F64;
      end case;
   end Value_Equal;

   procedure Error_Trans_Error (Trans : Transaction_Acc);
   pragma No_Return (Error_Trans_Error);

   procedure Error_Trans_Error (Trans : Transaction_Acc) is
   begin
      Error_S ("range check error on signal at ");
      Diag_C (Trans.File);
      Diag_C (':');
      Diag_C (Trans.Line);
      Error_E;
   end Error_Trans_Error;

   function Find_Driver (Sig : Ghdl_Signal_Ptr) return Ghdl_Index_Type
   is
      Proc : Process_Acc;
   begin
      if Sig.S.Drivers = null then
         Error ("assignment to a signal without any driver");
      end if;
      Proc := Get_Current_Process;
      for I in 0 .. Sig.S.Nbr_Drivers - 1 loop
         if Sig.S.Drivers (I).Proc = Proc then
            return I;
         end if;
      end loop;
      Error ("assignment to a signal without a driver for the process");
   end Find_Driver;

   function Get_Driver (Sig : Ghdl_Signal_Ptr) return Driver_Acc
   is
      Proc : Process_Acc;
   begin
      if Sig.S.Drivers = null then
         return null;
      end if;
      Proc := Get_Current_Process;
      for I in 0 .. Sig.S.Nbr_Drivers - 1 loop
         if Sig.S.Drivers (I).Proc = Proc then
            return Sig.S.Drivers (I)'Access;
         end if;
      end loop;
      return null;
   end Get_Driver;

   --  Return TRUE iff SIG has a future transaction for the current time,
   --  ie iff SIG will be active in the next delta cycle.  This is used to
   --  recompute whether SIG must be in the active chain.  SIG must be a user
   --  signal.
   function Has_Transaction_In_Next_Delta (Sig : Ghdl_Signal_Ptr)
                                          return Boolean  is
   begin
      if Sig.Flags.Is_Direct_Active then
         return True;
      end if;

      for I in 1 .. Sig.S.Nbr_Drivers loop
         declare
            Trans : constant Transaction_Acc :=
              Sig.S.Drivers (I - 1).First_Trans.Next;
         begin
            if Trans.Kind /= Trans_Direct
              and then Trans.Time = Current_Time
            then
               return True;
            end if;
         end;
      end loop;
      return False;
   end Has_Transaction_In_Next_Delta;

   --  Unique signal used to end lists.  Lists are not null-terminated so that
   --  it is easy to check if a signal is on the list: test if Link is
   --  not null.
   Signal_End_Decl : Ghdl_Signal := (Value_Ptr => null,
                                     Driving_Value => (Mode => Mode_B1,
                                                       B1 => False),
                                     Last_Value => (Mode => Mode_B1,
                                                    B1 => False),
                                     Last_Event => 0,
                                     Last_Active => 0,
                                     Event => False,
                                     Active => False,
                                     Has_Active => False,
                                     Mode => Mode_B1,

                                     Flags => (Propag => Propag_None,
                                               Sig_Kind => Kind_Signal_No,
                                               Is_Direct_Active => False,
                                               Is_Dumped => False,
                                               RO_Event => False,
                                               Implicit_Active_Next => False,
                                               Seen => False),

                                     Net => No_Signal_Net,
                                     Link => null,
                                     Alink => null,
                                     Flink => null,

                                     Event_List => null,

                                     Nbr_Ports => 0,
                                     Ports => null,

                                     S => (Mode_Sig => Mode_End));


   --  Unused but well-known signal which always terminate
   --    signal_active_chain.
   --  As a consequence, every element of the chain has a link field set to
   --  a non-null value (this is of course not true for SIGNAL_END).  This may
   --  be used to quickly check if a signal is in the list.
   --  This signal is not in the signal table.
   Signal_End : constant Ghdl_Signal_Ptr :=
     Signal_End_Decl'Unrestricted_access;

   --  List of signals that will be active in the next delta cycle.  Signals
   --  are inserted on this chain while processes are scheduling a transaction
   --  with a delay of 0.
   Signal_Active_Chain : Ghdl_Signal_Ptr;

   --  List of signals whose 'Active flag must be cleared.  A signal is added
   --  to this list by Mark_Active and removed by Reset_Active_Flag at the
   --  beginning of the next cycle.  This list is null-terminated, as it uses
   --  Alink (instead of Link) to link elements of the list.
   Active_Clear_List : Ghdl_Signal_Ptr := null;

   --  List of signals whose Update flag on the net has to be cleared.
   Update_Clear_Chain : Ghdl_Signal_Ptr;

   --  List of signals which have projected waveforms in the future (beyond
   --  the next delta cycle).
   --  Currently signals are never removed from this list.
   --  TODO: maybe remove signals when they have no transaction in the future?
   Future_List : Ghdl_Signal_Ptr;

   --  Insert SIG on the Future_List, if not already inserted.
   procedure Insert_Future_List (Sig : Ghdl_Signal_Ptr) is
   begin
      if Sig.Flink = null then
         Sig.Flink := Future_List;
         Future_List := Sig;
      end if;
   end Insert_Future_List;

   --  Add SIG in active_chain while the signal is being assigned while
   --  processes are executed.  So SIG has to be considered during the update
   --  phase.
   --
   --  It is also used internally by Run_Propagation to keep the list of nets
   --  whose update flag has to be cleared.
   procedure Insert_Active_Chain (Sig : Ghdl_Signal_Ptr);
   pragma Inline (Insert_Active_Chain);

   procedure Insert_Active_Chain (Sig : Ghdl_Signal_Ptr) is
   begin
      if Sig.Link = null then
         --  Use Grt.Threads.Atomic_Insert ?
         Sig.Link := Signal_Active_Chain;
         Signal_Active_Chain := Sig;
      end if;
   end Insert_Active_Chain;

   procedure Insert_Update_Clear_Chain (Sig : Ghdl_Signal_Ptr) is
   begin
      if Sig.Link = null then
         Sig.Link := Update_Clear_Chain;
         Update_Clear_Chain := Sig;
      end if;
   end Insert_Update_Clear_Chain;

   procedure Ghdl_Signal_Start_Assign (Sign : Ghdl_Signal_Ptr;
                                       Reject : Std_Time;
                                       Trans : Transaction_Acc;
                                       After : Std_Time)
   is
      Assign_Time : Std_Time;
      Drv : constant Ghdl_Index_Type := Find_Driver (Sign);
      Drv_Ptr : constant Driver_Arr_Ptr := Sign.S.Drivers;
      Driver : Driver_Type renames Drv_Ptr (Drv);
   begin
      --  LRM93 8.4.1
      --  It is an error if the time expression in a waveform element
      --  evaluates to a negative value.
      if After < 0 then
         Error ("negative time expression in signal assignment");
      end if;

      if After = 0 then
         --  Put SIGN on the active list if the transaction is scheduled
         --   for the next delta cycle.
         Insert_Active_Chain (Sign);
      else
         --  AFTER > 0.
         --  Put SIGN on the future list.
         Insert_Future_List (Sign);
      end if;

      Assign_Time := Current_Time + After;
      if Assign_Time < 0 then
         --  Beyond the future
         Free_In (Trans);
         return;
      end if;

      --  Handle sign as direct driver.
      if Driver.Last_Trans.Kind = Trans_Direct then
         if After /= 0 then
            Internal_Error ("direct assign with non-0 after");
         end if;
         --  FIXME: can be a bound-error too!
         if Trans.Kind = Trans_Value then
            Assign (Driver.Last_Trans.Val_Ptr, Trans.Val'Access, Sign.Mode);
            Free_In (Trans);
         elsif Trans.Kind = Trans_Error then
            Error_Trans_Error (Trans);
         else
            Internal_Error ("direct assign with non-value");
         end if;
         return;
      end if;

      --  LRM93 8.4.1
      --  1. All old transactions that are projected to occur at or after the
      --     time at which the earliest new transaction is projected to occur
      --     are deleted from the projected output waveform.
      if Driver.Last_Trans.Time >= Assign_Time then
         declare
            --  LAST is the last transaction to keep.
            Last : Transaction_Acc;
            Next : Transaction_Acc;
         begin
            Last := Driver.First_Trans;
            --  Find the first transaction to be deleted.
            Next := Last.Next;
            while Next /= null and then Next.Time < Assign_Time loop
               Last := Next;
               Next := Next.Next;
            end loop;
            --  Delete old transactions.
            if Next /= null then
               --  Set the last transaction of the driver.
               Driver.Last_Trans := Last;
               --  Cut the chain.  This is not strickly necessary, since
               --  it will be overriden below, by appending TRANS to the
               --  driver.
               Last.Next := null;
               --  Free removed transactions.
               loop
                  Last := Next.Next;
                  Free (Next);
                  exit when Last = null;
                  Next := Last;
               end loop;
            end if;
         end;
      end if;

      --  2.  The new transaction are then appended to the projected output
      --      waveform in the order of their projected occurence.
      Trans.Time := Assign_Time;
      Driver.Last_Trans.Next := Trans;
      Driver.Last_Trans := Trans;

      --  If the initial delay is inertial delay according to the definitions
      --  of section 8.4, the projected output waveform is further modified
      --  as follows:
      --  1.  All of the new transactions are marked.
      --  2.  An old transaction is marked if the time at which it is projected
      --      to occur is less than the time at which the first new transaction
      --      is projected to occur minus the pulse rejection limit.
      --  3.  For each remaining unmarked, old transaction, the old transaction
      --      is marked if it immediatly precedes a marked transaction and its
      --      value component is the same as that of the marked transaction;
      --  4.  The transaction that determines the current value of the driver
      --      is marked.
      --  5.  All unmarked transactions (all of which are old transactions) are
      --      deleted from the projected output waveform.
      --
      --  GHDL: only transactions that are projected to occur at [T-R, T[
      --  can be deleted (R is the reject time, T is now + after time).
      if Reject > 0 then
         --  LRM93 8.4
         --  It is an error if the pulse rejection limit for any inertially
         --  delayed signal assignment statement is [...] or greater than the
         --  time expression associated with the first waveform element.
         if Reject > After then
            Error ("pulse rejection greater than first waveform delay");
         end if;

         declare
            Prev : Transaction_Acc;
            Next : Transaction_Acc;
         begin
            --  Find the first transaction after the project time less the
            --  rejection time.
            --  PREV will be the last old transaction which is projected to
            --  occur before T - R.
            Prev := Driver.First_Trans;
            loop
               Next := Prev.Next;
               exit when Next.Time >= Assign_Time - Reject;
               Prev := Next;
            end loop;

            --  Scan every transaction until TRANS.  If a transaction value is
            --  different from the TRANS value, then delete all previous
            --  transactions (from T - R to the currently scanned transaction),
            --  since they are not marked.
            while Next /= Trans loop
               if Next.Kind /= Trans.Kind
                 or else
                 (Trans.Kind = Trans_Value
                  and then not Value_Equal (Next.Val, Trans.Val, Sign.Mode))
               then
                  --  NEXT is different from TRANS.
                  --  Delete ]PREV;NEXT].
                  declare
                     D, N : Transaction_Acc;
                  begin
                     D := Prev.Next;
                     Next := Next.Next;
                     Prev.Next := Next;
                     loop
                        N := D.Next;
                        Free (D);
                        exit when N = Next;
                        D := N;
                     end loop;
                  end;
               else
                  Next := Next.Next;
               end if;
            end loop;

            --  A previous assignment (with a 0 after time) may have put this
            --  signal on the active chain.  But maybe this previous
            --  transaction has been removed (due to rejection) and therefore
            --  this signal won't be active at the next delta.  So remove it
            --  from the active chain.  This is a little bit costly (because
            --  the chain is simply linked), but that issue doesn't appear
            --  frequently.
            if Sign.Link /= null
              and then not Has_Transaction_In_Next_Delta (Sign)
            then
               if Signal_Active_Chain = Sign then
                  --  At the head of the chain.
                  --  FIXME: this is not atomic.
                  Signal_Active_Chain := Sign.Link;
               else
                  --  In the middle of the chain.
                  declare
                     Prev : Ghdl_Signal_Ptr := Signal_Active_Chain;
                  begin
                     while Prev.Link /= Sign loop
                        Prev := Prev.Link;
                     end loop;
                     Prev.Link := Sign.Link;
                  end;
               end if;
               Sign.Link := null;


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