avr/qmk/uGFX - [no description]

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--  Debugger for interpreter
--  Copyright (C) 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 GHDL; see the file COPYING.  If not, write to the Free
--  Software Foundation, 59 Temple Place - Suite 330, Boston, MA
--  02111-1307, USA.

with System;
with Ada.Text_IO; use Ada.Text_IO;
with GNAT.Table;
with Types; use Types;
with Iir_Values; use Iir_Values;
with Name_Table;
with Str_Table;
with Files_Map;
with Parse;
with Scanner;
with Tokens;
with Sem_Expr;
with Sem_Scopes;
with Canon;
with Std_Names;
with Libraries;
with Std_Package;
with Annotations; use Annotations;
with Iirs_Utils; use Iirs_Utils;
with Errorout; use Errorout;
with Disp_Vhdl;
with Execution; use Execution;
with Simulation; use Simulation;
with Iirs_Walk; use Iirs_Walk;
with Areapools; use Areapools;
with Grt.Disp;
with Grt.Readline;
with Grt.Errors;
with Grt.Disp_Signals;

package body Debugger is
   --  This exception can be raised by a debugger command to directly return
   --  to the prompt.
   Command_Error : exception;

   type Menu_Procedure is access procedure (Line : String);

   --  If set (by commands), call this procedure on empty line to repeat
   --  last command.
   Cmd_Repeat : Menu_Procedure;

   --  For the list command: current file and current line.
   List_Current_File : Source_File_Entry := No_Source_File_Entry;
   List_Current_Line : Natural := 0;
   List_Current_Line_Pos : Source_Ptr := 0;

   --  Set List_Current_* from a location.  To be called after program break
   --  to indicate current location.
   procedure Set_List_Current (Loc : Location_Type)
   is
      Offset : Natural;
   begin
      Files_Map.Location_To_Coord
        (Loc, List_Current_File, List_Current_Line_Pos,
         List_Current_Line, Offset);
   end Set_List_Current;

   Dbg_Top_Frame : Block_Instance_Acc;
   Dbg_Cur_Frame : Block_Instance_Acc;

   procedure Set_Cur_Frame (Frame : Block_Instance_Acc) is
   begin
      Dbg_Cur_Frame := Frame;
   end Set_Cur_Frame;

   procedure Set_Top_Frame (Frame : Block_Instance_Acc) is
   begin
      Dbg_Top_Frame := Frame;
      Set_Cur_Frame (Frame);
   end Set_Top_Frame;

   type Breakpoint_Entry is record
      Stmt : Iir;
   end record;

   package Breakpoints is new GNAT.Table
     (Table_Index_Type => Natural,
      Table_Component_Type => Breakpoint_Entry,
      Table_Low_Bound => 1,
      Table_Initial => 16,
      Table_Increment => 100);

   --  Current execution state, or reason to stop execution (set by the
   --  last debugger command).
   type Exec_State_Type is
     (--  Execution should continue until a breakpoint is reached or assertion
      --  failure.
      Exec_Run,

      --  Execution will stop at the next statement.
      Exec_Single_Step,

      --  Execution will stop at the next simple statement in the same frame.
      Exec_Next,

      --  Execution will stop at the next statement in the same frame.  In
      --  case of compound statement, stop after the compound statement.
      Exec_Next_Stmt);

   Exec_State : Exec_State_Type := Exec_Run;

   --  Current frame for next.
   Exec_Instance : Block_Instance_Acc;

   --  Current statement for next_stmt.
   Exec_Statement : Iir;

   procedure Disp_Iir_Location (N : Iir) is
   begin
      if N = Null_Iir then
         Put (Standard_Error, "??:??:??");
      else
         Put (Standard_Error, Disp_Location (N));
      end if;
      Put (Standard_Error, ": ");
   end Disp_Iir_Location;

   -- Disp a message during execution.
   procedure Error_Msg_Exec (Msg: String; Loc: in Iir) is
   begin
      Disp_Iir_Location (Loc);
      Put (Standard_Error, ' ');
      Put_Line (Standard_Error, Msg);
      Grt.Errors.Fatal_Error;
   end Error_Msg_Exec;

   procedure Warning_Msg_Exec (Msg: String; Loc: Iir) is
   begin
      Disp_Iir_Location (Loc);
      Put (Standard_Error, "warning: ");
      Put_Line (Standard_Error, Msg);
   end Warning_Msg_Exec;

   -- Disp a message for a constraint error.
   procedure Error_Msg_Constraint (Expr: in Iir) is
   begin
      if Expr /= Null_Iir then
         Disp_Iir_Location (Expr);
      end if;
      Put (Standard_Error, "constraint violation");
      if Expr /= Null_Iir then
         case Get_Kind (Expr) is
            when Iir_Kind_Addition_Operator =>
               Put_Line (Standard_Error, " in the ""+"" operation");
            when Iir_Kind_Substraction_Operator =>
               Put_Line (Standard_Error, " in the ""-"" operation");
            when Iir_Kind_Integer_Literal =>
               Put_Line (Standard_Error, ", literal out of range");
            when Iir_Kind_Interface_Signal_Declaration
              | Iir_Kind_Signal_Declaration =>
               Put_Line (Standard_Error, " for " & Disp_Node (Expr));
            when others =>
               New_Line (Standard_Error);
         end case;
      end if;
      Grt.Errors.Fatal_Error;
   end Error_Msg_Constraint;

   function Get_Instance_Local_Name (Instance : Block_Instance_Acc;
                                     Short : Boolean := False)
                                    return String
   is
      Name : constant Iir := Instance.Label;
   begin
      if Name = Null_Iir then
         return "<anon>";
      end if;

      case Get_Kind (Name) is
         when Iir_Kind_Block_Statement
           | Iir_Kind_If_Generate_Statement
           | Iir_Kind_For_Generate_Statement
           | Iir_Kind_Component_Instantiation_Statement
           | Iir_Kind_Procedure_Declaration
           | Iir_Kinds_Process_Statement =>
            return Image_Identifier (Name);
         when Iir_Kind_Iterator_Declaration =>
            return Image_Identifier (Get_Parent (Name)) & '('
              & Execute_Image_Attribute
              (Instance.Objects (Get_Info (Name).Slot), Get_Type (Name))
              & ')';
         when Iir_Kind_Architecture_Body =>
            if Short then
               return Image_Identifier (Get_Entity (Name));
            else
               return Image_Identifier (Get_Entity (Name))
                 & '(' & Image_Identifier (Name) & ')';
            end if;
         when others =>
            Error_Kind ("disp_instance_local_name", Name);
      end case;
   end Get_Instance_Local_Name;

   -- Disp the name of an instance, without newline.
   procedure Disp_Instance_Name (Instance: Block_Instance_Acc;
                                 Short : Boolean := False) is
   begin
      if Instance.Parent /= null then
         Disp_Instance_Name (Instance.Parent);
         Put ('.');
      end if;
      Put (Get_Instance_Local_Name (Instance, Short));
   end Disp_Instance_Name;

   function Get_Instance_Name (Instance: Block_Instance_Acc) return String
   is
      function Parent_Name return String is
      begin
         if Instance.Parent /= null then
            return Get_Instance_Name (Instance.Parent) & '.';
         else
            return "";
         end if;
      end Parent_Name;
   begin
      return Parent_Name & Get_Instance_Local_Name (Instance);
   end Get_Instance_Name;

   procedure Disp_Instances_Tree_Name (Inst : Block_Instance_Acc) is
   begin
      if Inst = null then
         Put ("*null*");
         New_Line;
         return;
      end if;
      Put (Get_Instance_Local_Name (Inst));

      Put (" ");
      case Get_Kind (Inst.Label) is
         when Iir_Kind_Block_Statement =>
            Put ("[block]");
         when Iir_Kind_If_Generate_Statement
           | Iir_Kind_For_Generate_Statement =>
            Put ("[generate]");
         when Iir_Kind_Iterator_Declaration =>
            Put ("[iterator]");
         when Iir_Kind_Component_Instantiation_Statement =>
            Put ("[component]");
         when Iir_Kinds_Process_Statement =>
            Put ("[process]");
         when Iir_Kind_Architecture_Body =>
            Put ("[entity]");
         when others =>
            Error_Kind ("disp_instances_tree1", Inst.Label);
      end case;
      New_Line;
   end Disp_Instances_Tree_Name;

   procedure Disp_Instances_Tree1 (Inst : Block_Instance_Acc; Pfx : String)
   is
      Child : Block_Instance_Acc;
   begin
      Child := Inst.Children;
      if Child = null then
         return;
      end if;

      loop
         if Child.Brother /= null then
            Put (Pfx & "+-");
            Disp_Instances_Tree_Name (Child);

            Disp_Instances_Tree1 (Child, Pfx & "| ");
            Child := Child.Brother;
         else
            Put (Pfx & "`-");
            Disp_Instances_Tree_Name (Child);

            Disp_Instances_Tree1 (Child, Pfx & "  ");
            exit;
         end if;
      end loop;
   end Disp_Instances_Tree1;

   procedure Disp_Instances_Tree is
   begin
      Disp_Instances_Tree_Name (Top_Instance);
      Disp_Instances_Tree1 (Top_Instance, "");
   end Disp_Instances_Tree;

   --  Disp a block instance, in a human readable way.
   --  Used to debug.
   procedure Disp_Block_Instance (Instance: Block_Instance_Acc) is
   begin
      Put_Line ("scope:" & Image (Instance.Block_Scope));
      Put_Line ("Objects:");
      for I in Instance.Objects'Range loop
         Put (Object_Slot_Type'Image (I) & ": ");
         Disp_Value_Tab (Instance.Objects (I), 3);
         New_Line;
      end loop;
   end Disp_Block_Instance;

   procedure Disp_Signal (Value : Iir_Value_Literal_Acc; A_Type : Iir);

   procedure Disp_Signal_Array (Value : Iir_Value_Literal_Acc;
                                A_Type : Iir;
                                Dim : Natural)
   is
   begin
      if Dim = Get_Nbr_Elements (Get_Index_Subtype_List (A_Type)) then
         Put ("(");
         for I in Value.Val_Array.V'Range loop
            if I /= 1 then
               Put (", ");
            end if;
            Disp_Signal (Value.Val_Array.V (I), Get_Element_Subtype (A_Type));
         end loop;
         Put (")");
      else
         Put ("(");
         Disp_Signal_Array (Value, A_Type, Dim + 1);
         Put (")");
      end if;
   end Disp_Signal_Array;

   procedure Disp_Signal_Record (Value : Iir_Value_Literal_Acc; A_Type : Iir)
   is
      El : Iir_Element_Declaration;
      List : Iir_List;
   begin
      List := Get_Elements_Declaration_List (Get_Base_Type (A_Type));
      Put ("(");
      for I in Value.Val_Record.V'Range loop
         El := Get_Nth_Element (List, Natural (I - 1));
         if I /= 1 then
            Put (", ");
         end if;
         Put (Name_Table.Image (Get_Identifier (El)));
         Put (" => ");
         Disp_Signal (Value.Val_Record.V (I), Get_Type (El));
      end loop;
      Put (")");
   end Disp_Signal_Record;

   procedure Disp_Signal (Value : Iir_Value_Literal_Acc; A_Type : Iir) is
   begin
      if Value = null then
         Put ("!NULL!");
         return;
      end if;
      case Value.Kind is
         when Iir_Value_I64
           | Iir_Value_F64
           | Iir_Value_E32
           | Iir_Value_B1
           | Iir_Value_Access =>
            Disp_Iir_Value (Value, A_Type);
         when Iir_Value_Array =>
            Disp_Signal_Array (Value, A_Type, 1);
         when Iir_Value_Record =>
            Disp_Signal_Record (Value, A_Type);
         when Iir_Value_Range =>
            -- FIXME.
            raise Internal_Error;
         when Iir_Value_Signal =>
            Grt.Disp_Signals.Disp_A_Signal (Value.Sig);
         when Iir_Value_File
           | Iir_Value_Protected
           | Iir_Value_Quantity
           | Iir_Value_Terminal =>
            raise Internal_Error;
      end case;
   end Disp_Signal;

   procedure Disp_Instance_Signal (Instance: Block_Instance_Acc; Decl : Iir)
   is
      Info : constant Sim_Info_Acc := Get_Info (Decl);
   begin
      Put ("  ");
      Put (Name_Table.Image (Get_Identifier (Decl)));
      Put (" = ");
      Disp_Signal (Instance.Objects (Info.Slot), Get_Type (Decl));
   end Disp_Instance_Signal;

   procedure Disp_Instance_Signals_Of_Chain (Instance: Block_Instance_Acc;
                                             Chain : Iir)
   is
      El : Iir;
   begin
      El := Chain;
      while El /= Null_Iir loop
         case Get_Kind (El) is
            when Iir_Kind_Signal_Declaration
              | Iir_Kind_Interface_Signal_Declaration =>
               Disp_Instance_Signal (Instance, El);
            when others =>
               null;
         end case;
         El := Get_Chain (El);
      end loop;
   end Disp_Instance_Signals_Of_Chain;

   procedure Disp_Instance_Signals (Instance: Block_Instance_Acc)
   is
      Blk : constant Iir := Instance.Label;
      Child: Block_Instance_Acc;
   begin
      case Get_Kind (Blk) is
         when Iir_Kind_Architecture_Body =>
            declare
               Ent : constant Iir := Get_Entity (Blk);
            begin
               Disp_Instance_Name (Instance);
               Put_Line (" [architecture]:");

               Disp_Instance_Signals_Of_Chain
                 (Instance, Get_Port_Chain (Ent));
               Disp_Instance_Signals_Of_Chain
                 (Instance, Get_Declaration_Chain (Ent));
            end;
         when Iir_Kind_Block_Statement =>
            Disp_Instance_Name (Instance);
            Put_Line (" [block]:");

            --  FIXME: ports.
            Disp_Instance_Signals_Of_Chain
              (Instance, Get_Declaration_Chain (Blk));

         when Iir_Kind_If_Generate_Statement
           | Iir_Kind_For_Generate_Statement =>
            Disp_Instance_Name (Instance);
            Put_Line (" [generate]:");

         when Iir_Kind_Generate_Statement_Body =>
            Disp_Instance_Signals_Of_Chain
              (Instance, Get_Declaration_Chain (Blk));
         when Iir_Kind_Component_Instantiation_Statement =>
            null;
         when Iir_Kinds_Process_Statement =>
            null;
         when Iir_Kind_Iterator_Declaration =>
            null;
         when others =>
            Error_Kind ("disp_instance_signals", Instance.Label);
      end case;

      Child := Instance.Children;
      while Child /= null loop
         Disp_Instance_Signals (Child);
         Child := Child.Brother;
      end loop;
   end Disp_Instance_Signals;

   --  Disp all signals name and values.
   procedure Disp_Signals_Value is
   begin
      if Disp_Time_Before_Values then
         Grt.Disp.Disp_Now;
      end if;
      Disp_Instance_Signals (Top_Instance);
   end Disp_Signals_Value;

   procedure Disp_Objects_Value is
   begin
      null;
--       -- Disp the results.
--       for I in 0 .. Variables.Last loop
--          Put (Get_String (Variables.Table (I).Name.all));
--          Put (" = ");
--          Put (Get_Str_Value
--               (Get_Literal (variables.Table (I).Value.all),
--                Get_Type (variables.Table (I).Value.all)));
--          if I = variables.Last then
--             Put_Line (";");
--          else
--             Put (", ");
--          end if;
--       end loop;
   end Disp_Objects_Value;

   procedure Disp_Label (Process : Iir)
   is
      Label : Name_Id;
   begin
         Label := Get_Label (Process);
         if Label = Null_Identifier then
            Put ("<unlabeled>");
         else
            Put (Name_Table.Image (Label));
         end if;
   end Disp_Label;

   procedure Disp_Declaration_Objects
     (Instance : Block_Instance_Acc; Decl_Chain : Iir)
   is
      El : Iir;
   begin
      El := Decl_Chain;
      while El /= Null_Iir loop
         case Get_Kind (El) is
            when Iir_Kind_Constant_Declaration
              | Iir_Kind_Variable_Declaration
              | Iir_Kind_Interface_Variable_Declaration
              | Iir_Kind_Interface_Constant_Declaration
              | Iir_Kind_Interface_File_Declaration
              | Iir_Kind_Object_Alias_Declaration =>
               Put (Disp_Node (El));
               Put (" = ");
               Disp_Value_Tab (Instance.Objects (Get_Info (El).Slot), 3);
            when Iir_Kind_Interface_Signal_Declaration =>
               declare
                  Sig : Iir_Value_Literal_Acc;
               begin
                  Sig := Instance.Objects (Get_Info (El).Slot);
                  Put (Disp_Node (El));
                  Put (" = ");
                  Disp_Signal (Sig, Get_Type (El));
                  New_Line;
               end;
            when Iir_Kind_Type_Declaration
              | Iir_Kind_Anonymous_Type_Declaration
              | Iir_Kind_Subtype_Declaration =>
               --  FIXME: disp ranges
               null;
            when others =>
               Error_Kind ("disp_declaration_objects", El);
         end case;
         El := Get_Chain (El);
      end loop;
   end Disp_Declaration_Objects;

   procedure Disp_Objects (Instance : Block_Instance_Acc)
   is
      Decl : constant Iir := Instance.Label;
   begin
      Disp_Instance_Name (Instance);
      New_Line;
      case Get_Kind (Decl) is
         when Iir_Kind_Procedure_Declaration
           | Iir_Kind_Function_Declaration =>
            Disp_Declaration_Objects
              (Instance, Get_Interface_Declaration_Chain (Decl));
            Disp_Declaration_Objects
              (Instance,
               Get_Declaration_Chain (Get_Subprogram_Body (Decl)));
         when Iir_Kind_Architecture_Body =>
            declare
               Entity : constant Iir_Entity_Declaration := Get_Entity (Decl);
            begin
               Disp_Declaration_Objects
                 (Instance, Get_Generic_Chain (Entity));
               Disp_Declaration_Objects
                 (Instance, Get_Port_Chain (Entity));
               Disp_Declaration_Objects
                 (Instance, Get_Declaration_Chain (Entity));
               Disp_Declaration_Objects
                 (Instance, Get_Declaration_Chain (Decl));
               --  FIXME: processes.
            end;
         when Iir_Kind_Component_Instantiation_Statement =>
            null;
         when others =>
            Error_Kind ("disp_objects", Decl);
      end case;
   end Disp_Objects;
   pragma Unreferenced (Disp_Objects);

   procedure Disp_Process_Stats
   is
      Proc : Iir;
      Stmt : Iir;
      Nbr_User_Sensitized_Processes : Natural := 0;
      Nbr_User_If_Sensitized_Processes : Natural := 0;
      Nbr_Conc_Sensitized_Processes : Natural := 0;
      Nbr_User_Non_Sensitized_Processes : Natural := 0;
      Nbr_Conc_Non_Sensitized_Processes : Natural := 0;
   begin
      for I in Processes_Table.First .. Processes_Table.Last loop
         Proc := Processes_Table.Table (I).Label;
         case Get_Kind (Proc) is
            when Iir_Kind_Sensitized_Process_Statement =>
               if Get_Process_Origin (Proc) = Null_Iir then
                  Stmt := Get_Sequential_Statement_Chain (Proc);
                  if Stmt /= Null_Iir
                    and then Get_Kind (Stmt) = Iir_Kind_If_Statement
                    and then Get_Chain (Stmt) = Null_Iir
                  then
                     Nbr_User_If_Sensitized_Processes :=
                       Nbr_User_If_Sensitized_Processes + 1;
                  else
                     Nbr_User_Sensitized_Processes :=
                       Nbr_User_Sensitized_Processes + 1;
                  end if;
               else
                  Nbr_Conc_Sensitized_Processes :=
                    Nbr_Conc_Sensitized_Processes + 1;
               end if;
            when Iir_Kind_Process_Statement =>
               if Get_Process_Origin (Proc) = Null_Iir then
                  Nbr_User_Non_Sensitized_Processes :=
                    Nbr_User_Non_Sensitized_Processes + 1;
               else
                  Nbr_Conc_Non_Sensitized_Processes :=
                    Nbr_Conc_Non_Sensitized_Processes + 1;
               end if;
            when others =>
               raise Internal_Error;
         end case;
      end loop;

      Put (Natural'Image (Nbr_User_If_Sensitized_Processes));
      Put_Line (" user sensitized processes with only a if stmt");
      Put (Natural'Image (Nbr_User_Sensitized_Processes));
      Put_Line (" user sensitized processes (others)");
      Put (Natural'Image (Nbr_User_Non_Sensitized_Processes));
      Put_Line (" user non sensitized processes");
      Put (Natural'Image (Nbr_Conc_Sensitized_Processes));
      Put_Line (" sensitized concurrent statements");
      Put (Natural'Image (Nbr_Conc_Non_Sensitized_Processes));
      Put_Line (" non sensitized concurrent statements");
      Put (Process_Index_Type'Image (Processes_Table.Last));
      Put_Line (" processes (total)");
   end Disp_Process_Stats;

   procedure Disp_Signals_Stats
   is
      type Counters_Type is array (Signal_Type_Kind) of Natural;
      Counters : Counters_Type := (others => 0);
      Nbr_Signal_Elements : Natural := 0;
   begin
      for I in Signals_Table.First .. Signals_Table.Last loop
         declare
            Ent : Signal_Entry renames Signals_Table.Table (I);
         begin
            if Ent.Kind = User_Signal then
               Nbr_Signal_Elements := Nbr_Signal_Elements +
                 Get_Nbr_Of_Scalars (Signals_Table.Table (I).Sig);
            end if;
            Counters (Ent.Kind) := Counters (Ent.Kind) + 1;
         end;
      end loop;
      Put (Integer'Image (Counters (User_Signal)));
      Put_Line (" declared user signals or ports");
      Put (Integer'Image (Nbr_Signal_Elements));
      Put_Line (" user signals sub-elements");
      Put (Integer'Image (Counters (Implicit_Quiet)));
      Put_Line (" 'quiet implicit signals");
      Put (Integer'Image (Counters (Implicit_Stable)));
      Put_Line (" 'stable implicit signals");
      Put (Integer'Image (Counters (Implicit_Delayed)));
      Put_Line (" 'delayed implicit signals");
      Put (Integer'Image (Counters (Implicit_Transaction)));
      Put_Line (" 'transaction implicit signals");
      Put (Integer'Image (Counters (Guard_Signal)));
      Put_Line (" guard signals");
   end Disp_Signals_Stats;

   procedure Disp_Design_Stats is
   begin
      Disp_Process_Stats;

      New_Line;

      Disp_Signals_Stats;

      New_Line;

      Put (Integer'Image (Connect_Table.Last));
      Put_Line (" connections");
   end Disp_Design_Stats;

   procedure Disp_Design_Non_Sensitized
   is
      Instance : Block_Instance_Acc;
      Proc : Iir;
   begin
      for I in Processes_Table.First .. Processes_Table.Last loop
         Instance := Processes_Table.Table (I);
         Proc := Processes_Table.Table (I).Label;
         if Get_Kind (Proc) = Iir_Kind_Process_Statement then
            Disp_Instance_Name (Instance);
            New_Line;
            Put_Line ("   at " & Disp_Location (Proc));
         end if;
      end loop;
   end Disp_Design_Non_Sensitized;

   procedure Disp_Design_Connections is
   begin
      for I in Connect_Table.First .. Connect_Table.Last loop
         declare
            Conn : Connect_Entry renames Connect_Table.Table (I);
         begin
            Disp_Iir_Location (Conn.Assoc);
            New_Line;
         end;
      end loop;
   end Disp_Design_Connections;

   function Walk_Files (Cb : Walk_Cb) return Walk_Status
   is
      Lib : Iir_Library_Declaration := Libraries.Get_Libraries_Chain;
      File : Iir_Design_File;
   begin
      while Lib /= Null_Iir loop
         File := Get_Design_File_Chain (Lib);
         while File /= Null_Iir loop
            case Cb.all (File) is
               when Walk_Continue =>
                  null;
               when Walk_Up =>
                  exit;
               when Walk_Abort =>
                  return Walk_Abort;
            end case;
            File := Get_Chain (File);
         end loop;
         Lib := Get_Chain (Lib);
      end loop;
      return Walk_Continue;
   end Walk_Files;

   Walk_Units_Cb : Walk_Cb;

   function Cb_Walk_Units (Design_File : Iir) return Walk_Status
   is
      Unit : Iir_Design_Unit;
   begin
      Unit := Get_First_Design_Unit (Design_File);
      while Unit /= Null_Iir loop
         case Walk_Units_Cb.all (Get_Library_Unit (Unit)) is
            when Walk_Continue =>
               null;
            when Walk_Abort =>
               return Walk_Abort;
            when Walk_Up =>
               exit;
         end case;
         Unit := Get_Chain (Unit);
      end loop;
      return Walk_Continue;
   end Cb_Walk_Units;

   function Walk_Units (Cb : Walk_Cb) return Walk_Status is
   begin
      Walk_Units_Cb := Cb;
      return Walk_Files (Cb_Walk_Units'Access);
   end Walk_Units;

   Walk_Declarations_Cb : Walk_Cb;

   function Cb_Walk_Declarations (Unit : Iir) return Walk_Status
   is
      function Walk_Decl_Chain (Chain : Iir) return Walk_Status
      is
         Decl : Iir;
      begin
         Decl := Chain;
         while Decl /= Null_Iir loop
            case Walk_Declarations_Cb.all (Decl) is
               when Walk_Abort =>
                  return Walk_Abort;
               when Walk_Up =>
                  return Walk_Continue;
               when Walk_Continue =>
                  null;
            end case;
            Decl := Get_Chain (Decl);
         end loop;
         return Walk_Continue;
      end Walk_Decl_Chain;

      function Walk_Conc_Chain (Chain : Iir) return Walk_Status
      is
         Stmt : Iir := Chain;
      begin
         while Stmt /= Null_Iir loop
            case Get_Kind (Stmt) is
               when Iir_Kind_Process_Statement =>
                  if Walk_Decl_Chain (Get_Declaration_Chain (Stmt))
                    = Walk_Abort
                  then
                     return Walk_Abort;
                  end if;
               when others =>
                  Error_Kind ("walk_conc_chain", Stmt);
            end case;
            Stmt := Get_Chain (Stmt);
         end loop;
         return Walk_Continue;
      end Walk_Conc_Chain;
   begin
      case Get_Kind (Unit) is
         when Iir_Kind_Entity_Declaration =>
            if Walk_Decl_Chain (Get_Generic_Chain (Unit)) = Walk_Abort
              or else Walk_Decl_Chain (Get_Port_Chain (Unit)) = Walk_Abort
              or else (Walk_Decl_Chain
                         (Get_Declaration_Chain (Unit)) = Walk_Abort)
              or else (Walk_Conc_Chain
                         (Get_Concurrent_Statement_Chain (Unit)) = Walk_Abort)
            then
               return Walk_Abort;
            end if;
         when Iir_Kind_Architecture_Body =>
            if (Walk_Decl_Chain
                  (Get_Declaration_Chain (Unit)) = Walk_Abort)
              or else (Walk_Conc_Chain
                         (Get_Concurrent_Statement_Chain (Unit)) = Walk_Abort)
            then
               return Walk_Abort;
            end if;
         when Iir_Kind_Package_Declaration
           | Iir_Kind_Package_Body =>
            if Walk_Decl_Chain (Get_Declaration_Chain (Unit)) = Walk_Abort
            then
               return Walk_Abort;
            end if;
         when Iir_Kind_Configuration_Declaration =>
            if Walk_Decl_Chain (Get_Declaration_Chain (Unit)) = Walk_Abort
            then
               return Walk_Abort;
            end if;
            --  FIXME: block configuration ?
         when others =>
            Error_Kind ("Cb_Walk_Declarations", Unit);
      end case;
      return Walk_Continue;
   end Cb_Walk_Declarations;

   function Walk_Declarations (Cb : Walk_Cb) return Walk_Status is
   begin
      Walk_Declarations_Cb := Cb;
      return Walk_Units (Cb_Walk_Declarations'Access);
   end Walk_Declarations;

   function Is_Blank (C : Character) return Boolean is
   begin
      return C = ' ' or else C = ASCII.HT;
   end Is_Blank;

   function Skip_Blanks (S : String) return Positive
   is
      P : Positive := S'First;
   begin
      while P <= S'Last and then Is_Blank (S (P)) loop
         P := P + 1;
      end loop;
      return P;
   end Skip_Blanks;

   --  Return the position of the last character of the word (the last
   --  non-blank character).
   function Get_Word (S : String) return Positive
   is
      P : Positive := S'First;
   begin
      while P <= S'Last and then not Is_Blank (S (P)) loop
         P := P + 1;
      end loop;
      return P - 1;
   end Get_Word;

   procedure Disp_A_Frame (Instance: Block_Instance_Acc) is
   begin
      Put (Disp_Node (Instance.Label));
      if Instance.Stmt /= Null_Iir then
         Put (" at ");
         Put (Files_Map.Image (Get_Location (Instance.Stmt)));
      end if;
      New_Line;
   end Disp_A_Frame;

   procedure Disp_Current_Lines
   is
      use Files_Map;
      --  Number of lines to display before and after the current line.
      Radius : constant := 5;

      Buf : File_Buffer_Acc;

      Pos : Source_Ptr;
      Line : Natural;
      Len : Source_Ptr;
      C : Character;
   begin
      if List_Current_Line > Radius then
         Line := List_Current_Line - Radius;
      else
         Line := 1;
      end if;

      Pos := Line_To_Position (List_Current_File, Line);
      Buf := Get_File_Source (List_Current_File);

      while Line < List_Current_Line + Radius loop
         --  Compute line length.
         Len := 0;
         loop
            C := Buf (Pos + Len);
            exit when C = ASCII.CR or C = ASCII.LF or C = ASCII.EOT;
            Len := Len + 1;
         end loop;

         --  Disp line number.
         declare
            Str : constant String := Natural'Image (Line);
         begin
            if Line = List_Current_Line then
               Put ('*');
            else
               Put (' ');
            end if;
            Put ((Str'Length .. 5 => ' '));
            Put (Str (Str'First + 1 .. Str'Last));
            Put (' ');
         end;

         --  Disp line.
         Put_Line (String (Buf (Pos .. Pos + Len - 1)));

         --  Skip EOL.
         exit when C = ASCII.EOT;
         Pos := Pos + Len + 1;
         if C = ASCII.CR then
            if Buf (Pos) = ASCII.LF then
               Pos := Pos + 1;
            end if;
         else
            pragma Assert (C = ASCII.LF);
            if Buf (Pos) = ASCII.CR then
               Pos := Pos + 1;
            end if;
         end if;

         Line := Line + 1;
      end loop;
   end Disp_Current_Lines;

   procedure Disp_Source_Line (Loc : Location_Type)
   is
      use Files_Map;

      File : Source_File_Entry;
      Line_Pos : Source_Ptr;
      Line : Natural;
      Offset : Natural;
      Buf : File_Buffer_Acc;
      Next_Line_Pos : Source_Ptr;
   begin
      Location_To_Coord (Loc, File, Line_Pos, Line, Offset);
      Buf := Get_File_Source (File);
      Next_Line_Pos := Line_To_Position (File, Line + 1);
      Put (String (Buf (Line_Pos .. Next_Line_Pos - 1)));
   end Disp_Source_Line;

   type Menu_Kind is (Menu_Command, Menu_Submenu);
   type Menu_Entry (Kind : Menu_Kind);
   type Menu_Entry_Acc is access all Menu_Entry;

   type Cst_String_Acc is access constant String;

   type Menu_Entry (Kind : Menu_Kind) is record
      Name : Cst_String_Acc;
      Next : Menu_Entry_Acc;

      case Kind is
         when Menu_Command =>
            Proc : Menu_Procedure;
         when Menu_Submenu =>
            First, Last : Menu_Entry_Acc := null;
      end case;
   end record;

   --  Check there is a current process.
   procedure Check_Current_Process is
   begin
      if Current_Process = null then
         Put_Line ("no current process");
         raise Command_Error;
      end if;
   end Check_Current_Process;

   --  The status of the debugger.  This status can be modified by a command
   --  as a side effect to resume or quit the debugger.
   type Command_Status_Type is (Status_Default, Status_Quit);
   Command_Status : Command_Status_Type;

   procedure Help_Proc (Line : String);

   procedure Disp_Process_Loc (Proc : Process_State_Type) is
   begin
      Disp_Instance_Name (Proc.Top_Instance);
      Put (" (" & Files_Map.Image (Get_Location (Proc.Proc)) & ")");
      New_Line;
   end Disp_Process_Loc;

   --  Disp the list of processes (and its state)
   procedure Ps_Proc (Line : String) is
      pragma Unreferenced (Line);
      Process : Iir;
   begin
      if Processes_State = null then
         Put_Line ("no processes");
         return;
      end if;

      for I in Processes_State'Range loop
         Put (Process_Index_Type'Image (I) & ": ");
         Process := Processes_State (I).Proc;
         if Process /= Null_Iir then
            Disp_Process_Loc (Processes_State (I));
            Disp_A_Frame (Processes_State (I).Instance);
         else
            Put_Line ("not yet elaborated");
         end if;
      end loop;
   end Ps_Proc;

   procedure List_Proc (Line : String)
   is
      pragma Unreferenced (Line);
   begin
      Disp_Current_Lines;
   end List_Proc;

   procedure Up_Proc (Line : String)
   is
      pragma Unreferenced (Line);
   begin
      Check_Current_Process;
      if Dbg_Cur_Frame.Parent = null then
         Put_Line ("top of frames reached");
      else
         Set_Cur_Frame (Dbg_Cur_Frame.Parent);
      end if;
   end Up_Proc;

   procedure Down_Proc (Line : String)
   is
      pragma Unreferenced (Line);
      Inst : Block_Instance_Acc;
   begin
      Check_Current_Process;
      if Dbg_Cur_Frame = Dbg_Top_Frame then
         Put_Line ("bottom of frames reached");
      else
         Inst := Dbg_Top_Frame;
         while Inst.Parent /= Dbg_Cur_Frame loop
            Inst := Inst.Parent;
         end loop;
         Set_Cur_Frame (Inst);
      end if;
   end Down_Proc;

   procedure Set_Breakpoint (Stmt : Iir) is
   begin
      Put_Line ("set breakpoint at: " & Files_Map.Image (Get_Location (Stmt)));
      Breakpoints.Append (Breakpoint_Entry'(Stmt => Stmt));
      Flag_Need_Debug := True;
   end Set_Breakpoint;

   function Is_Within_Statement (Stmt : Iir; Cur : Iir) return Boolean
   is
      Parent : Iir;
   begin
      Parent := Cur;
      loop
         if Parent = Stmt then
            return True;
         end if;
         case Get_Kind (Parent) is
            when Iir_Kinds_Sequential_Statement =>
               Parent := Get_Parent (Parent);
            when others =>
               return False;
         end case;
      end loop;
   end Is_Within_Statement;

   --  Next statement in the same frame, but handle compound statements as
   --  one statement.
   procedure Next_Stmt_Proc (Line : String)
   is
      pragma Unreferenced (Line);
   begin
      Exec_State := Exec_Next_Stmt;
      Exec_Instance := Dbg_Top_Frame;
      Exec_Statement := Dbg_Top_Frame.Stmt;
      Flag_Need_Debug := True;
      Command_Status := Status_Quit;
   end Next_Stmt_Proc;

   --  Finish parent statement.
   procedure Finish_Stmt_Proc (Line : String)
   is
      pragma Unreferenced (Line);
   begin
      Exec_State := Exec_Next_Stmt;
      Exec_Instance := Dbg_Top_Frame;
      Exec_Statement := Get_Parent (Dbg_Top_Frame.Stmt);
      Flag_Need_Debug := True;
      Command_Status := Status_Quit;
   end Finish_Stmt_Proc;

   procedure Next_Proc (Line : String)
   is
      pragma Unreferenced (Line);
   begin
      Exec_State := Exec_Next;
      Exec_Instance := Dbg_Top_Frame;
      Flag_Need_Debug := True;
      Command_Status := Status_Quit;
      Cmd_Repeat := Next_Proc'Access;
   end Next_Proc;

   procedure Step_Proc (Line : String)
   is
      pragma Unreferenced (Line);
   begin
      Exec_State := Exec_Single_Step;
      Flag_Need_Debug := True;
      Command_Status := Status_Quit;
   end Step_Proc;

   Break_Id : Name_Id;

   function Cb_Set_Break (El : Iir) return Walk_Status is
   begin
      case Get_Kind (El) is
         when Iir_Kind_Function_Declaration
           | Iir_Kind_Procedure_Declaration =>
            if Get_Identifier (El) = Break_Id
              and then
              Get_Implicit_Definition (El) not in Iir_Predefined_Implicit
            then
               Set_Breakpoint
                 (Get_Sequential_Statement_Chain (Get_Subprogram_Body (El)));
            end if;
         when others =>
            null;
      end case;
      return Walk_Continue;
   end Cb_Set_Break;

   procedure Break_Proc (Line : String)
   is
      Status : Walk_Status;
      P : Natural;
   begin
      P := Skip_Blanks (Line);
      if Line (P) = '"' then
         --  An operator name.
         declare
            use Str_Table;
            Str : String8_Id;
            Len : Nat32;
         begin
            Str := Create_String8;
            Len := 0;
            P := P + 1;
            while Line (P) /= '"' loop
               Append_String8_Char (Line (P));
               Len := Len + 1;
               P := P + 1;
            end loop;
            Break_Id := Parse.Str_To_Operator_Name (Str, Len, No_Location);
            --  FIXME: free string.
            --  FIXME: catch error.
         end;
      else
         Break_Id := Name_Table.Get_Identifier (Line (P .. Line'Last));
      end if;
      Status := Walk_Declarations (Cb_Set_Break'Access);
      pragma Assert (Status = Walk_Continue);
   end Break_Proc;

   procedure Where_Proc (Line : String) is
      pragma Unreferenced (Line);
      Frame : Block_Instance_Acc;
   begin
      Check_Current_Process;
      Frame := Dbg_Top_Frame;
      while Frame /= null loop
         if Frame = Dbg_Cur_Frame then
            Put ("* ");
         else
            Put ("  ");
         end if;
         Disp_A_Frame (Frame);
         Frame := Frame.Parent;
      end loop;
   end Where_Proc;

   procedure Info_Tree_Proc (Line : String)
   is
      pragma Unreferenced (Line);
   begin
      if Top_Instance = null then
         Put_Line ("design not yet fully elaborated");
      else
         Disp_Instances_Tree;
      end if;
   end Info_Tree_Proc;

   procedure Info_Params_Proc (Line : String)
   is
      pragma Unreferenced (Line);
      Decl : Iir;
      Params : Iir;
   begin
      Check_Current_Process;
      Decl := Dbg_Cur_Frame.Label;
      if Decl = Null_Iir
        or else Get_Kind (Decl) not in Iir_Kinds_Subprogram_Declaration
      then
         Put_Line ("current frame is not a subprogram");
         return;
      end if;
      Params := Get_Interface_Declaration_Chain (Decl);
      Disp_Declaration_Objects (Dbg_Cur_Frame, Params);
   end Info_Params_Proc;

   procedure Info_Proc_Proc (Line : String) is
      pragma Unreferenced (Line);
   begin
      Check_Current_Process;
      Disp_Process_Loc (Current_Process.all);
   end Info_Proc_Proc;

   function Cb_Disp_Subprograms (El : Iir) return Walk_Status is
   begin
      case Get_Kind (El) is
         when Iir_Kind_Function_Declaration
           | Iir_Kind_Procedure_Declaration =>
            Put_Line (Name_Table.Image (Get_Identifier (El)));
         when others =>
            null;
      end case;
      return Walk_Continue;
   end Cb_Disp_Subprograms;

   procedure Info_Subprograms_Proc (Line : String) is
      pragma Unreferenced (Line);
      Status : Walk_Status;
   begin
      Status := Walk_Declarations (Cb_Disp_Subprograms'Access);
      pragma Assert (Status = Walk_Continue);
   end Info_Subprograms_Proc;

   function Cb_Disp_Units (El : Iir) return Walk_Status is
   begin
      case Get_Kind (El) is


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