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------------------------------------------------------------------------------

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                                  A L I                                   --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--          Copyright (C) 1992-2009, Free Software Foundation, Inc.         --

--                                                                          --

-- GNAT is free software;  you can  redistribute it  and/or modify it under --

-- terms of the  GNU General Public License as published  by the Free Soft- --

-- ware  Foundation;  either version 3,  or (at your option) any later ver- --

-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --

-- OUT 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  distributed with GNAT; see file COPYING3.  If not, go to --

-- http://www.gnu.org/licenses for a complete copy of the license.          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

------------------------------------------------------------------------------

--  This package defines the internal data structures used for representation

--  of Ada Library Information (ALI) acquired from the ALI files generated

--  by the front end.

with Casing;  use Casing;

with Gnatvsn; use Gnatvsn;

with Namet;   use Namet;

with Rident;  use Rident;

with Table;

with Types;   use Types;

with GNAT.HTable; use GNAT.HTable;

package ALI is

   --------------

   -- Id Types --

   --------------

   --  The various entries are stored in tables with distinct subscript ranges.

   --  The following type definitions show the ranges used for the subscripts

   --  (Id values) for the various tables.

   type ALI_Id is range 0 .. 999_999;

   --  Id values used for ALIs table entries

   type Unit_Id is range 1_000_000 .. 1_999_999;

   --  Id values used for Unit table entries

   type With_Id is range 2_000_000 .. 2_999_999;

   --  Id values used for Withs table entries

   type Arg_Id is range 3_000_000 .. 3_999_999;

   --  Id values used for argument table entries

   type Sdep_Id is range 4_000_000 .. 4_999_999;

   --  Id values used for Sdep table entries

   type Source_Id is range 5_000_000 .. 5_999_999;

   --  Id values used for Source table entries

   type Interrupt_State_Id is range 6_000_000 .. 6_999_999;

   --  Id values used for Interrupt_State table entries

   type Priority_Specific_Dispatching_Id is range 7_000_000 .. 7_999_999;

   --  Id values used for Priority_Specific_Dispatching table entries

   --------------------

   -- ALI File Table --

   --------------------

   --  Each ALI file read generates an entry in the ALIs table

   No_ALI_Id : constant ALI_Id := ALI_Id'First;

   --  Special value indicating no ALI entry

   First_ALI_Entry : constant ALI_Id := No_ALI_Id + 1;

   --  Id of first actual entry in table

   type Main_Program_Type is (None, Proc, Func);

   --  Indicator of whether unit can be used as main program

   type ALIs_Record is record

      Afile : File_Name_Type;

      --  Name of ALI file

      Ofile_Full_Name : File_Name_Type;

      --  Full name of object file corresponding to the ALI file

      Sfile : File_Name_Type;

      --  Name of source file that generates this ALI file (which is equal

      --  to the name of the source file in the first unit table entry for

      --  this ALI file, since the body if present is always first).

      Ver : String (1 .. Ver_Len_Max);

      --  Value of library version (V line in ALI file). Not set if

      --  V lines are ignored as a result of the Ignore_Lines parameter.

      Ver_Len : Natural;

      --  Length of characters stored in Ver. Not set if V lines are ignored as

      --  a result of the Ignore_Lines parameter.

      SAL_Interface : Boolean;

      --  Set True when this is an interface to a standalone library

      First_Unit : Unit_Id;

      --  Id of first Unit table entry for this file

      Last_Unit : Unit_Id;

      --  Id of last Unit table entry for this file

      First_Sdep : Sdep_Id;

      --  Id of first Sdep table entry for this file

      Last_Sdep : Sdep_Id;

      --  Id of last Sdep table entry for this file

      Main_Program : Main_Program_Type;

      --  Indicator of whether first unit can be used as main program. Not set

      --  if 'M' appears in Ignore_Lines.

      Main_Priority : Int;

      --  Indicates priority value if Main_Program field indicates that this

      --  can be a main program. A value of -1 (No_Main_Priority) indicates

      --  that no parameter was found, or no M line was present. Not set if

      --  'M' appears in Ignore_Lines.

      Time_Slice_Value : Int;

      --  Indicates value of time slice parameter from T=xxx on main program

      --  line. A value of -1 indicates that no T=xxx parameter was found, or

      --  no M line was present. Not set if 'M' appears in Ignore_Lines.

      WC_Encoding : Character;

      --  Wide character encoding if main procedure. Otherwise not relevant.

      --  Not set if 'M' appears in Ignore_Lines.

      Locking_Policy : Character;

      --  Indicates locking policy for units in this file. Space means tasking

      --  was not used, or that no Locking_Policy pragma was present or that

      --  this is a language defined unit. Otherwise set to first character

      --  (upper case) of policy name. Not set if 'P' appears in Ignore_Lines.

      Queuing_Policy : Character;

      --  Indicates queuing policy for units in this file. Space means tasking

      --  was not used, or that no Queuing_Policy pragma was present or that

      --  this is a language defined unit. Otherwise set to first character

      --  (upper case) of policy name. Not set if 'P' appears in Ignore_Lines.

      Task_Dispatching_Policy : Character;

      --  Indicates task dispatching policy for units in this file. Space means

      --  tasking was not used, or that no Task_Dispatching_Policy pragma was

      --  present or that this is a language defined unit. Otherwise set to

      --  first character (upper case) of policy name. Not set if 'P' appears

      --  in Ignore_Lines.

      Compile_Errors : Boolean;

      --  Set to True if compile errors for unit. Note that No_Object will

      --  always be set as well in this case. Not set if 'P' appears in

      --  Ignore_Lines.

      Float_Format : Character;

      --  Set to float format (set to I if no float-format given). Not set if

      --  'P' appears in Ignore_Lines.

      No_Object : Boolean;

      --  Set to True if no object file generated. Not set if 'P' appears in

      --  Ignore_Lines.

      Normalize_Scalars : Boolean;

      --  Set to True if file was compiled with Normalize_Scalars. Not set if

      --  'P' appears in Ignore_Lines.

      Unit_Exception_Table : Boolean;

      --  Set to True if unit exception table pointer generated. Not set if 'P'

      --  appears in Ignore_Lines.

      Zero_Cost_Exceptions : Boolean;

      --  Set to True if file was compiled with zero cost exceptions. Not set

      --  if 'P' appears in Ignore_Lines.

      Restrictions : Restrictions_Info;

      --  Restrictions information reconstructed from R lines

      First_Interrupt_State : Interrupt_State_Id;

      Last_Interrupt_State  : Interrupt_State_Id'Base;

      --  These point to the first and last entries in the interrupt state

      --  table for this unit. If no entries, then Last_Interrupt_State =

      --  First_Interrupt_State - 1 (that's why the 'Base reference is there,

      --  it can be one less than the lower bound of the subtype). Not set if

      --  'I' appears in Ignore_Lines

      First_Specific_Dispatching : Priority_Specific_Dispatching_Id;

      Last_Specific_Dispatching  : Priority_Specific_Dispatching_Id'Base;

      --  These point to the first and last entries in the priority specific

      --  dispatching table for this unit. If there are no entries, then

      --  Last_Specific_Dispatching = First_Specific_Dispatching - 1. That

      --  is why the 'Base reference is there, it can be one less than the

      --  lower bound of the subtype. Not set if 'S' appears in Ignore_Lines.

   end record;

   No_Main_Priority : constant Int := -1;

   --  Code for no main priority set

   package ALIs is new Table.Table (

     Table_Component_Type => ALIs_Record,

     Table_Index_Type     => ALI_Id,

     Table_Low_Bound      => First_ALI_Entry,

     Table_Initial        => 500,

     Table_Increment      => 200,

     Table_Name           => "ALIs");

   ----------------

   -- Unit Table --

   ----------------

   --  Each unit within an ALI file generates an entry in the unit table

   No_Unit_Id : constant Unit_Id := Unit_Id'First;

   --  Special value indicating no unit table entry

   First_Unit_Entry : constant Unit_Id := No_Unit_Id + 1;

   --  Id of first actual entry in table

   type Unit_Type is (Is_Spec, Is_Body, Is_Spec_Only, Is_Body_Only);

   --  Indicates type of entry, if both body and spec appear in the ALI file,

   --  then the first unit is marked Is_Body, and the second is marked Is_Spec.

   --  If only a spec appears, then it is marked as Is_Spec_Only, and if only

   --  a body appears, then it is marked Is_Body_Only).

   subtype Version_String is String (1 .. 8);

   --  Version string, taken from unit record

   type Unit_Record is record

      My_ALI : ALI_Id;

      --  Corresponding ALI entry

      Uname : Unit_Name_Type;

      --  Name of Unit

      Sfile : File_Name_Type;

      --  Name of source file

      Preelab : Boolean;

      --  Indicates presence of PR parameter for a preelaborated package

      No_Elab : Boolean;

      --  Indicates presence of NE parameter for a unit that has does not

      --  have an elaboration routine (since it has no elaboration code).

      Pure : Boolean;

      --  Indicates presence of PU parameter for a package having pragma Pure

      Dynamic_Elab : Boolean;

      --  Set to True if the unit was compiled with dynamic elaboration checks

      --  (i.e. either -gnatE or pragma Elaboration_Checks (RM) was used to

      --  compile the unit).

      Elaborate_Body : Boolean;

      --  Indicates presence of EB parameter for a package which has a pragma

      --  Elaborate_Body, and also for generic package instantiations.

      Set_Elab_Entity : Boolean;

      --  Indicates presence of EE parameter for a unit which has an

      --  elaboration entity which must be set true as part of the

      --  elaboration of the entity.

      Has_RACW : Boolean;

      --  Indicates presence of RA parameter for a package that declares at

      --  least one Remote Access to Class_Wide (RACW) object.

      Remote_Types : Boolean;

      --  Indicates presence of RT parameter for a package which has a

      --  pragma Remote_Types.

      Shared_Passive : Boolean;

      --  Indicates presence of SP parameter for a package which has a pragma

      --  Shared_Passive.

      RCI : Boolean;

      --  Indicates presence of RC parameter for a package which has a pragma

      --  Remote_Call_Interface.

      Predefined : Boolean;

      --  Indicates if unit is language predefined (or a child of such a unit)

      Internal : Boolean;

      --  Indicates if unit is an internal unit (or a child of such a unit)

      First_With : With_Id;

      --  Id of first withs table entry for this file

      Last_With : With_Id;

      --  Id of last withs table entry for this file

      First_Arg : Arg_Id;

      --  Id of first args table entry for this file

      Last_Arg : Arg_Id;

      --  Id of last args table entry for this file

      Utype : Unit_Type;

      --  Type of entry

      Is_Generic : Boolean;

      --  True for generic unit (i.e. a generic declaration, or a generic

      --  body). False for a non-generic unit.

      Unit_Kind : Character;

      --  Indicates the nature of the unit. 'p' for Packages and 's' for

      --  subprograms.

      Version : Version_String;

      --  Version of unit

      Icasing : Casing_Type;

      --  Indicates casing of identifiers in source file for this unit. This

      --  is used for informational output, and also for constructing the main

      --  unit if it is being built in Ada.

      Kcasing : Casing_Type;

      --  Indicates casing of keywords in source file for this unit. This is

      --  used for informational output, and also for constructing the main

      --  unit if it is being built in Ada.

      Elab_Position : aliased Natural;

      --  Initialized to zero. Set non-zero when a unit is chosen and

      --  placed in the elaboration order. The value represents the

      --  ordinal position in the elaboration order.

      Init_Scalars : Boolean;

      --  Set True if IS qualifier appears in ALI file, indicating that

      --  an Initialize_Scalars pragma applies to the unit.

      SAL_Interface : Boolean;

      --  Set True when this is an interface to a standalone library

      Body_Needed_For_SAL : Boolean;

      --  Indicates that the source for the body of the unit (subprogram,

      --  package, or generic unit) must be included in a standalone library.

      Elaborate_Body_Desirable : Boolean;

      --  Indicates that the front end elaboration circuitry decided that it

      --  would be a good idea if this package had Elaborate_Body. The binder

      --  will attempt, but does not promise, to place the elaboration call

      --  for the body right after the call for the spec, or at least as close

      --  together as possible.

      Optimize_Alignment : Character;

      --  Optimize_Alignment setting. Set to L/S/T/O for OL/OS/OT/OO present

   end record;

   package Units is new Table.Table (

     Table_Component_Type => Unit_Record,

     Table_Index_Type     => Unit_Id,

     Table_Low_Bound      => First_Unit_Entry,

     Table_Initial        => 100,

     Table_Increment      => 200,

     Table_Name           => "Unit");

   ---------------------------

   -- Interrupt State Table --

   ---------------------------

   --  An entry is made in this table for each I (interrupt state) line

   --  encountered in the input ALI file. The First/Last_Interrupt_Id

   --  fields of the ALI file entry show the range of entries defined

   --  within a particular ALI file.

   type Interrupt_State_Record is record

      Interrupt_Id : Nat;

      --  Id from interrupt state entry

      Interrupt_State : Character;

      --  State from interrupt state entry ('u'/'r'/'s')

      IS_Pragma_Line : Nat;

      --  Line number of Interrupt_State pragma

   end record;

   package Interrupt_States is new Table.Table (

     Table_Component_Type => Interrupt_State_Record,

     Table_Index_Type     => Interrupt_State_Id'Base,

     Table_Low_Bound      => Interrupt_State_Id'First,

     Table_Initial        => 100,

     Table_Increment      => 200,

     Table_Name           => "Interrupt_States");

   -----------------------------------------

   -- Priority Specific Dispatching Table --

   -----------------------------------------

   --  An entry is made in this table for each S (priority specific

   --  dispatching) line encountered in the input ALI file. The

   --  First/Last_Specific_Dispatching_Id fields of the ALI file

   --  entry show the range of entries defined within a particular

   --  ALI file.

   type Specific_Dispatching_Record is record

      Dispatching_Policy : Character;

      --  First character (upper case) of the corresponding policy name

      First_Priority     : Nat;

      --  Lower bound of the priority range to which the specified dispatching

      --  policy applies.

      Last_Priority      : Nat;

      --  Upper bound of the priority range to which the specified dispatching

      --  policy applies.

      PSD_Pragma_Line : Nat;

      --  Line number of Priority_Specific_Dispatching pragma

   end record;

   package Specific_Dispatching is new Table.Table (

     Table_Component_Type => Specific_Dispatching_Record,

     Table_Index_Type     => Priority_Specific_Dispatching_Id'Base,

     Table_Low_Bound      => Priority_Specific_Dispatching_Id'First,

     Table_Initial        => 100,

     Table_Increment      => 200,

     Table_Name           => "Priority_Specific_Dispatching");

   --------------

   -- Switches --

   --------------

   --  These switches record status information about ali files that

   --  have been read, for quick reference without searching tables.

   --  Note: a switch will be left set at its default value if the line

   --  which might otherwise set it is ignored (from Ignore_Lines).

   Dynamic_Elaboration_Checks_Specified : Boolean := False;

   --  Set to False by Initialize_ALI. Set to True if Scan_ALI reads

   --  a unit for which dynamic elaboration checking is enabled.

   Float_Format_Specified : Character := ' ';

   --  Set to blank by Initialize_ALI. Set to appropriate float format

   --  character (V or I, see Opt.Float_Format) if an ali file that

   --  is read contains an F line setting the floating point format.

   Initialize_Scalars_Used : Boolean := False;

   --  Set True if an ali file contains the Initialize_Scalars flag

   Locking_Policy_Specified : Character := ' ';

   --  Set to blank by Initialize_ALI. Set to the appropriate locking policy

   --  character if an ali file contains a P line setting the locking policy.

   No_Normalize_Scalars_Specified : Boolean := False;

   --  Set to False by Initialize_ALI. Set to True if an ali file indicates

   --  that the file was compiled without normalize scalars.

   No_Object_Specified : Boolean := False;

   --  Set to False by Initialize_ALI. Set to True if an ali file contains

   --  the No_Object flag.

   Normalize_Scalars_Specified : Boolean := False;

   --  Set to False by Initialize_ALI. Set to True if an ali file indicates

   --  that the file was compiled in Normalize_Scalars mode.

   Queuing_Policy_Specified : Character := ' ';

   --  Set to blank by Initialize_ALI. Set to the appropriate queuing policy

   --  character if an ali file contains a P line setting the queuing policy.

   Cumulative_Restrictions : Restrictions_Info := No_Restrictions;

   --  This variable records the cumulative contributions of R lines in all

   --  ali files, showing whether a restriction pragma exists anywhere, and

   --  accumulating the aggregate knowledge of violations.

   Stack_Check_Switch_Set : Boolean := False;

   --  Set to True if at least one ALI file contains '-fstack-check' in its

   --  argument list.

   Static_Elaboration_Model_Used : Boolean := False;

   --  Set to False by Initialize_ALI. Set to True if any ALI file for a

   --  non-internal unit compiled with the static elaboration model is

   --  encountered.

   Task_Dispatching_Policy_Specified : Character := ' ';

   --  Set to blank by Initialize_ALI. Set to the appropriate task dispatching

   --  policy character if an ali file contains a P line setting the

   --  task dispatching policy.

   Unreserve_All_Interrupts_Specified : Boolean := False;

   --  Set to False by Initialize_ALI. Set to True if an ali file is read that

   --  has  P line specifying unreserve all interrupts mode.

   Zero_Cost_Exceptions_Specified : Boolean := False;

   --  Set to False by Initialize_ALI. Set to True if an ali file is read that

   --  has a P line specifying the generation of zero cost exceptions.

   -----------------

   -- Withs Table --

   -----------------

   --  Each With line (W line) in an ALI file generates a Withs table entry

   --  Note: there will be no entries in this table if 'W' lines are ignored

   No_With_Id : constant With_Id := With_Id'First;

   --  Special value indicating no withs table entry

   First_With_Entry : constant With_Id := No_With_Id + 1;

   --  Id of first actual entry in table

   type With_Record is record

      Uname : Unit_Name_Type;

      --  Name of Unit

      Sfile : File_Name_Type;

      --  Name of source file, set to No_File in generic case

      Afile : File_Name_Type;

      --  Name of ALI file, set to No_File in generic case

      Elaborate : Boolean;

      --  Indicates presence of E parameter

      Elaborate_All : Boolean;

      --  Indicates presence of EA parameter

      Elab_All_Desirable : Boolean;

      --  Indicates presence of AD parameter

      Elab_Desirable     : Boolean;

      --  Indicates presence of ED parameter

      SAL_Interface : Boolean := False;

      --  True if the Unit is an Interface of a Stand-Alone Library

      Limited_With : Boolean := False;

      --  True if unit is named in a limited_with_clause

   end record;

   package Withs is new Table.Table (

     Table_Component_Type => With_Record,

     Table_Index_Type     => With_Id,

     Table_Low_Bound      => First_With_Entry,

     Table_Initial        => 5000,

     Table_Increment      => 200,

     Table_Name           => "Withs");

   ---------------------

   -- Arguments Table --

   ---------------------

   --  Each Arg line (A line) in an ALI file generates an Args table entry

   --  Note: there will be no entries in this table if 'A' lines are ignored

   No_Arg_Id : constant Arg_Id := Arg_Id'First;

   --  Special value indicating no args table entry

   First_Arg_Entry : constant Arg_Id := No_Arg_Id + 1;

   --  Id of first actual entry in table

   package Args is new Table.Table (

     Table_Component_Type => String_Ptr,

     Table_Index_Type     => Arg_Id,

     Table_Low_Bound      => First_Arg_Entry,

     Table_Initial        => 1000,

     Table_Increment      => 100,

     Table_Name           => "Args");

   --------------------------

   -- Linker_Options Table --

   --------------------------

   --  If an ALI file has one of more Linker_Options lines, then a single

   --  entry is made in this table. If more than one Linker_Options lines

   --  appears in a given ALI file, then the arguments are concatenated

   --  to form the entry in this table, using a NUL character as the

   --  separator, and a final NUL character is appended to the end.

   --  Note: there will be no entries in this table if 'L' lines are ignored

   type Linker_Option_Record is record

      Name : Name_Id;

      --  Name entry containing concatenated list of Linker_Options

      --  arguments separated by NUL and ended by NUL as described above.

      Unit : Unit_Id;

      --  Unit_Id for the entry

      Internal_File : Boolean;

      --  Set True if the linker options are from an internal file. This is

      --  used to insert certain standard entries after all the user entries

      --  but before the entries from the run-time.

      Original_Pos : Positive;

      --  Keep track of original position in the linker options table. This

      --  is used to implement a stable sort when we sort the linker options

      --  table.

   end record;

   --  Declare the Linker_Options Table

   --  The indexes of active entries in this table range from 1 to the

   --  value of Linker_Options.Last. The zero'th element is for sort call.

   package Linker_Options is new Table.Table (

     Table_Component_Type => Linker_Option_Record,

     Table_Index_Type     => Integer,

     Table_Low_Bound      => 0,

     Table_Initial        => 200,

     Table_Increment      => 400,

     Table_Name           => "Linker_Options");

   -------------------------------------------

   -- External Version Reference Hash Table --

   -------------------------------------------

   --  This hash table keeps track of external version reference strings

   --  as read from E lines in the ali file. The stored values do not

   --  include the terminating quote characters.

   --  Note: there will be no entries in this table if 'E' lines are ignored

   type Vindex is range 0 .. 98;

   --  Type to define range of headers

   function SHash (S : String_Ptr) return Vindex;

   --  Hash function for this table

   function SEq (F1, F2 : String_Ptr) return Boolean;

   --  Equality function for this table

   package Version_Ref is new Simple_HTable (

     Header_Num => Vindex,

     Element    => Boolean,

     No_Element => False,

     Key        => String_Ptr,

     Hash       => SHash,

     Equal      => SEq);

   -------------------------

   -- No_Dependency Table --

   -------------------------

   --  Each R line for a No_Dependency Restriction generates an entry in

   --  this No_Dependency table.

   type No_Dep_Record is record

      ALI_File : ALI_Id;

      --  ALI File containing the entry

      No_Dep_Unit : Name_Id;

      --  Id for names table entry including entire name, including periods

   end record;

   package No_Deps is new Table.Table (

     Table_Component_Type => No_Dep_Record,

     Table_Index_Type     => Integer,

     Table_Low_Bound      => 0,

     Table_Initial        => 200,

     Table_Increment      => 400,

     Table_Name           => "No_Deps");

   ------------------------------------

   -- Sdep (Source Dependency) Table --

   ------------------------------------

   --  Each source dependency (D line) in an ALI file generates an entry in the

   --  Sdep table.

   --  Note: there will be no entries in this table if 'D' lines are ignored

   No_Sdep_Id : constant Sdep_Id := Sdep_Id'First;

   --  Special value indicating no Sdep table entry

   First_Sdep_Entry : Sdep_Id := No_Sdep_Id + 1;

   --  Id of first Sdep entry for current ali file. This is initialized to the

   --  first Sdep entry in the table, and then incremented appropriately as

   --  successive ALI files are scanned.

   type Sdep_Record is record

      Sfile : File_Name_Type;

      --  Name of source file

      Stamp : Time_Stamp_Type;

      --  Time stamp value. Note that this will be all zero characters for the

      --  dummy entries for missing or non-dependent files.

      Checksum : Word;

      --  Checksum value. Note that this will be all zero characters for the

      --  dummy entries for missing or non-dependent files

      Dummy_Entry : Boolean;

      --  Set True for dummy entries that correspond to missing files or files

      --  where no dependency relationship exists.

      Subunit_Name : Name_Id;

      --  Name_Id for subunit name if present, else No_Name

      Rfile : File_Name_Type;

      --  Reference file name. Same as Sfile unless a Source_Reference pragma

      --  was used, in which case it reflects the name used in the pragma.

      Start_Line : Nat;

      --  Starting line number in file. Always 1, unless a Source_Reference

      --  pragma was used, in which case it reflects the line number value

      --  given in the pragma.

   end record;

   package Sdep is new Table.Table (

     Table_Component_Type => Sdep_Record,

     Table_Index_Type     => Sdep_Id,

     Table_Low_Bound      => First_Sdep_Entry,

     Table_Initial        => 5000,

     Table_Increment      => 200,

     Table_Name           => "Sdep");

   ----------------------------

   -- Use of Name Table Info --

   ----------------------------

   --  All unit names and file names are entered into the Names table. The Info

   --  fields of these entries are used as follows:

   --    Unit name           Info field has Unit_Id of unit table entry

   --    ALI file name       Info field has ALI_Id of ALI table entry

   --    Source file name    Info field has Source_Id of source table entry

   --------------------------

   -- Cross-Reference Data --

   --------------------------

   --  The following table records cross-reference sections, there is one entry

   --  for each X header line in the ALI file for an xref section.

   --  Note: there will be no entries in this table if 'X' lines are ignored

   type Xref_Section_Record is record

      File_Num : Sdep_Id;

      --  Dependency number for file (entry in Sdep.Table)

      File_Name : File_Name_Type;

      --  Name of file

      First_Entity : Nat;

      --  First entry in Xref_Entity table

      Last_Entity : Nat;

      --  Last entry in Xref_Entity table

   end record;

   package Xref_Section is new Table.Table (

     Table_Component_Type => Xref_Section_Record,

     Table_Index_Type     => Nat,

     Table_Low_Bound      => 1,

     Table_Initial        => 50,

     Table_Increment      => 300,

     Table_Name           => "Xref_Section");

   --  The following is used to indicate whether a typeref field is present

   --  for the entity, and if so what kind of typeref field.

   type Tref_Kind is (

     Tref_None,    --  No typeref present

     Tref_Access,  --  Access type typeref (points to designated type)

     Tref_Derived, --  Derived type typeref (points to parent type)

     Tref_Type);   --  All other cases

   --  The following table records entities for which xrefs are recorded

   type Xref_Entity_Record is record

      Line : Pos;

      --  Line number of definition

      Etype : Character;

      --  Set to the identification character for the entity. See section

      --  "Cross-Reference Entity Identifiers" in lib-xref.ads for details.

      Col : Pos;

      --  Column number of definition

      Lib : Boolean;

      --  True if entity is library level entity

      Entity : Name_Id;

      --  Name of entity

      Iref_File_Num : Sdep_Id;

      --  This field is set to the dependency reference for the file containing

      --  the generic entity that this one instantiates, or to No_Sdep_Id if

      --  the current entity is not an instantiation

      Iref_Line : Nat;

      --  This field is set to the line number in Iref_File_Num of the generic

      --  entity that this one instantiates, or to zero if the current entity

      --  is not an instantiation.

      Rref_Line : Nat;

      --  This field is set to the line number of a renaming reference if

      --  one is present, or to zero if no renaming reference is present

      Rref_Col : Nat;

      --  This field is set to the column number of a renaming reference

      --  if one is present, or to zero if no renaming reference is present.

      Tref : Tref_Kind;

      --  Indicates if a typeref is present, and if so what kind. Set to

      --  Tref_None if no typeref field is present.

      Tref_File_Num : Sdep_Id;

      --  This field is set to No_Sdep_Id if no typeref is present, or

      --  if the typeref refers to an entity in standard. Otherwise it

      --  it is the dependency reference for the file containing the

      --  declaration of the typeref entity.

      Tref_Line : Nat;

      --  This field is set to zero if no typeref is present, or if the

      --  typeref refers to an entity in standard. Otherwise it contains

      --  the line number of the declaration of the typeref entity.

      Tref_Type : Character;

      --  This field is set to blank if no typeref is present, or if the

      --  typeref refers to an entity in standard. Otherwise it contains

      --  the identification character for the typeref entity. See section

      --  "Cross-Reference Entity Identifiers" in lib-xref.ads for details.

      Tref_Col : Nat;

      --  This field is set to zero if no typeref is present, or if the

      --  typeref refers to an entity in standard. Otherwise it contains

      --  the column number of the declaration of the parent type.

      Tref_Standard_Entity : Name_Id;

      --  This field is set to No_Name if no typeref is present or if the

      --  typeref refers to a declared entity rather than an entity in

      --  package Standard. If there is a typeref that references an

      --  entity in package Standard, then this field is a Name_Id

      --  reference for the entity name.

      Oref_File_Num : Sdep_Id;

      --  This field is set to No_Sdep_Id if the entity doesn't override any

      --  other entity, or to the dependency reference for the overridden