gcc/ada/ali.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                                  A L I                                   --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --                                                                          --
  10 --          Copyright (C) 1992-2002 Free Software Foundation, Inc.          --
  11 --                                                                          --
  12 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  13 -- terms of the  GNU General Public License as published  by the Free Soft- --
  14 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  15 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  16 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  17 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  18 -- for  more details.  You should have  received  a copy of the GNU General --
  19 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  20 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  21 -- MA 02111-1307, USA.                                                      --
  22 --                                                                          --
  23 -- GNAT was originally developed  by the GNAT team at  New York University. --
  24 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
  25 --                                                                          --
  26 ------------------------------------------------------------------------------
  27
  28 --  This package defines the internal data structures used for representation
  29 --  of Ada Library Information (ALI) acquired from the ALI files generated
  30 --  by the front end.
  31
  32 with Casing;  use Casing;
  33 with Gnatvsn; use Gnatvsn;
  34 with Rident;  use Rident;
  35 with Table;
  36 with Types;   use Types;
  37
  38 with GNAT.HTable; use GNAT.HTable;
  39
  40 package ALI is
  41
  42    --------------
  43    -- Id Types --
  44    --------------
  45
  46    --  The various entries are stored in tables with distinct subscript
  47    --  ranges. The following type definitions indicate the ranges used
  48    --  for the subscripts (Id values) for the various tables.
  49
  50    type ALI_Id is range 0 .. 999_999;
  51    --  Id values used for ALIs table entries
  52
  53    type Unit_Id is range 1_000_000 .. 1_999_999;
  54    --  Id values used for Unit table entries
  55
  56    type With_Id is range 2_000_000 .. 2_999_999;
  57    --  Id values used for Withs table entries
  58
  59    type Arg_Id is range 3_000_000 .. 3_999_999;
  60    --  Id values used for argument table entries
  61
  62    type Sdep_Id is range 4_000_000 .. 4_999_999;
  63    --  Id values used for Sdep table entries
  64
  65    type Source_Id is range 5_000_000 .. 5_999_999;
  66    --  Id values used for Source table entries
  67
  68    --------------------
  69    -- ALI File Table --
  70    --------------------
  71
  72    --  Each ALI file read generates an entry in the ALIs table
  73
  74    No_ALI_Id : constant ALI_Id := ALI_Id'First;
  75    --  Special value indicating no ALI entry
  76
  77    First_ALI_Entry : constant ALI_Id := No_ALI_Id + 1;
  78    --  Id of first actual entry in table
  79
  80    type Main_Program_Type is (None, Proc, Func);
  81    --  Indicator of whether unit can be used as main program
  82
  83    type Restrictions_String is array (All_Restrictions) of Character;
  84    --  Type used to hold string from R line
  85
  86    type ALIs_Record is record
  87
  88       Afile : File_Name_Type;
  89       --  Name of ALI file
  90
  91       Ofile_Full_Name : Name_Id;
  92       --  Full name of object file corresponding to the ALI file
  93
  94       Sfile : File_Name_Type;
  95       --  Name of source file that generates this ALI file (which is equal
  96       --  to the name of the source file in the first unit table entry for
  97       --  this ALI file, since the body if present is always first).
  98
  99       Ver : String (1 .. Ver_Len_Max);
 100       --  Value of library version (V line in ALI file)
 101
 102       Ver_Len : Natural;
 103       --  Length of characters stored in Ver
 104
 105       First_Unit : Unit_Id;
 106       --  Id of first Unit table entry for this file
 107
 108       Last_Unit : Unit_Id;
 109       --  Id of last Unit table entry for this file
 110
 111       First_Sdep : Sdep_Id;
 112       --  Id of first Sdep table entry for this file
 113
 114       Last_Sdep : Sdep_Id;
 115       --  Id of last Sdep table entry for this file
 116
 117       Main_Program : Main_Program_Type;
 118       --  Indicator of whether first unit can be used as main program
 119
 120       Main_Priority : Int;
 121       --  Indicates priority value if Main_Program field indicates that
 122       --  this can be a main program. A value of -1 (No_Main_Priority)
 123       --  indicates that no parameter was found, or no M line was present.
 124
 125       Time_Slice_Value : Int;
 126       --  Indicates value of time slice parameter from T=xxx on main program
 127       --  line. A value of -1 indicates that no T=xxx parameter was found,
 128       --  or no M line was present.
 129
 130       WC_Encoding : Character;
 131       --  Wide character encoding if main procedure. Otherwise not relevant.
 132
 133       Locking_Policy : Character;
 134       --  Indicates locking policy for units in this file. Space means
 135       --  tasking was not used, or that no Locking_Policy pragma was
 136       --  present or that this is a language defined unit. Otherwise set
 137       --  to first character (upper case) of policy name.
 138
 139       Queuing_Policy : Character;
 140       --  Indicates queuing policy for units in this file. Space means
 141       --  tasking was not used, or that no Queuing_Policy pragma was
 142       --  present or that this is a language defined unit. Otherwise set
 143       --  to first character (upper case) of policy name.
 144
 145       Task_Dispatching_Policy : Character;
 146       --  Indicates task dispatching policy for units in this file. Space
 147       --  means tasking was not used, or that no Task_Dispatching_Policy
 148       --  pragma was present or that this is a language defined unit.
 149       --  Otherwise set to first character (upper case) of policy name.
 150
 151       Compile_Errors : Boolean;
 152       --  Set to True if compile errors for unit. Note that No_Object
 153       --  will always be set as well in this case.
 154
 155       Float_Format : Character;
 156       --  Set to float format (set to I if no float-format given)
 157
 158       No_Object : Boolean;
 159       --  Set to True if no object file generated
 160
 161       No_Run_Time : Boolean;
 162       --  Set to True if file was compiled with pragma No_Run_Time
 163
 164       Normalize_Scalars : Boolean;
 165       --  Set to True if file was compiled with Normalize_Scalars
 166
 167       Unit_Exception_Table : Boolean;
 168       --  Set to True if unit exception table pointer generated
 169
 170       Zero_Cost_Exceptions : Boolean;
 171       --  Set to True if file was compiled with zero cost exceptions
 172
 173       Restrictions : Restrictions_String;
 174       --  Copy of restrictions letters from R line
 175
 176    end record;
 177
 178    No_Main_Priority : constant Int := -1;
 179    --  Code for no main priority set
 180
 181    package ALIs is new Table.Table (
 182      Table_Component_Type => ALIs_Record,
 183      Table_Index_Type     => ALI_Id,
 184      Table_Low_Bound      => First_ALI_Entry,
 185      Table_Initial        => 500,
 186      Table_Increment      => 200,
 187      Table_Name           => "ALIs");
 188
 189    ----------------
 190    -- Unit Table --
 191    ----------------
 192
 193    --  Each unit within an ALI file generates an entry in the unit table
 194
 195    No_Unit_Id : constant Unit_Id := Unit_Id'First;
 196    --  Special value indicating no unit table entry
 197
 198    First_Unit_Entry : constant Unit_Id := No_Unit_Id + 1;
 199    --  Id of first actual entry in table
 200
 201    type Unit_Type is (Is_Spec, Is_Body, Is_Spec_Only, Is_Body_Only);
 202    --  Indicates type of entry, if both body and spec appear in the ALI file,
 203    --  then the first unit is marked Is_Body, and the second is marked Is_Spec.
 204    --  If only a spec appears, then it is marked as Is_Spec_Only, and if only
 205    --  a body appears, then it is marked Is_Body_Only).
 206
 207    subtype Version_String is String (1 .. 8);
 208    --  Version string, taken from unit record
 209
 210    type Unit_Record is record
 211
 212       My_ALI : ALI_Id;
 213       --  Corresponding ALI entry
 214
 215       Uname : Unit_Name_Type;
 216       --  Name of Unit
 217
 218       Sfile : File_Name_Type;
 219       --  Name of source file
 220
 221       Preelab : Boolean;
 222       --  Indicates presence of PR parameter for a preelaborated package
 223
 224       No_Elab : Boolean;
 225       --  Indicates presence of NE parameter for a unit that has does not
 226       --  have an elaboration routine (since it has no elaboration code).
 227
 228       Pure : Boolean;
 229       --  Indicates presence of PU parameter for a pure package
 230
 231       Dynamic_Elab : Boolean;
 232       --  Set to True if the unit was compiled with dynamic elaboration
 233       --  checks (i.e. either -gnatE or pragma Elaboration_Checks (Static)
 234       --  was used to compile the unit).
 235
 236       Elaborate_Body : Boolean;
 237       --  Indicates presence of EB parameter for a package which has a
 238       --  pragma Preelaborate_Body.
 239
 240       Set_Elab_Entity : Boolean;
 241       --  Indicates presence of EE parameter for a unit which has an
 242       --  elaboration entity which must be set true as part of the
 243       --  elaboration of the entity.
 244
 245       Has_RACW : Boolean;
 246       --  Indicates presence of RA parameter for a package that declares
 247       --  at least one Remote Access to Class_Wide (RACW) object.
 248
 249       Remote_Types : Boolean;
 250       --  Indicates presence of RT parameter for a package which has a
 251       --  pragma Remote_Types.
 252
 253       Shared_Passive : Boolean;
 254       --  Indicates presence of SP parameter for a package which has a
 255       --  pragma Shared_Passive.
 256
 257       RCI : Boolean;
 258       --  Indicates presence of RC parameter for a package which has a
 259       --  pragma Remote_Call_Interface.
 260
 261       Predefined : Boolean;
 262       --  Indicates if unit is language predefined (or a child of such a unit)
 263
 264       Internal : Boolean;
 265       --  Indicates if unit is an internal unit (or a child of such a unit)
 266
 267       First_With : With_Id;
 268       --  Id of first withs table entry for this file
 269
 270       Last_With : With_Id;
 271       --  Id of last withs table entry for this file
 272
 273       First_Arg : Arg_Id;
 274       --  Id of first args table entry for this file
 275
 276       Last_Arg : Arg_Id;
 277       --  Id of last args table entry for this file
 278
 279       Utype : Unit_Type;
 280       --  Type of entry
 281
 282       Is_Generic : Boolean;
 283       --  True for generic unit (i.e. a generic declaration, or a generic
 284       --  body). False for a non-generic unit.
 285
 286       Unit_Kind : Character;
 287       --  Indicates the nature of the unit. 'p' for Packages and 's' for
 288       --  subprograms.
 289
 290       Version : Version_String;
 291       --  Version of unit
 292
 293       Icasing : Casing_Type;
 294       --  Indicates casing of identifiers in source file for this unit. This
 295       --  is used for informational output, and also for constructing the
 296       --  main unit if it is being built in Ada.
 297
 298       Kcasing : Casing_Type;
 299       --  Indicates casing of keyowords in source file for this unit. This
 300       --  is used for informational output, and also for constructing the
 301       --  main unit if it is being built in Ada.
 302
 303       Elab_Position : aliased Natural;
 304       --  Initialized to zero. Set non-zero when a unit is chosen and
 305       --  placed in the elaboration order. The value represents the
 306       --  ordinal position in the elaboration order.
 307
 308       Init_Scalars : Boolean;
 309       --  Set True if IS qualifier appears in ALI file, indicating that
 310       --  an Initialize_Scalars pragma applies to the unit.
 311
 312    end record;
 313
 314    package Units is new Table.Table (
 315      Table_Component_Type => Unit_Record,
 316      Table_Index_Type     => Unit_Id,
 317      Table_Low_Bound      => First_Unit_Entry,
 318      Table_Initial        => 100,
 319      Table_Increment      => 200,
 320      Table_Name           => "Unit");
 321
 322    --------------
 323    -- Switches --
 324    --------------
 325
 326    --  These switches record status information about ali files that
 327    --  have been read, for quick reference without searching tables.
 328
 329    Dynamic_Elaboration_Checks_Specified : Boolean := False;
 330    --  Set to False by Initialize_ALI. Set to True if Read_ALI reads
 331    --  a unit for which dynamic elaboration checking is enabled.
 332
 333    Float_Format_Specified : Character := ' ';
 334    --  Set to blank by Initialize_ALI. Set to appropriate float format
 335    --  character (V or I, see Opt.Float_Format) if an an ali file that
 336    --  is read contains an F line setting the floating point format.
 337
 338    Initialize_Scalars_Used : Boolean := False;
 339    --  Set True if an ali file contains the Initialize_Scalars flag
 340
 341    Locking_Policy_Specified : Character := ' ';
 342    --  Set to blank by Initialize_ALI. Set to the appropriate locking policy
 343    --  character if an ali file contains a P line setting the locking policy.
 344
 345    No_Normalize_Scalars_Specified : Boolean := False;
 346    --  Set to False by Initialize_ALI. Set to True if an ali file indicates
 347    --  that the file was compiled without normalize scalars.
 348
 349    No_Object_Specified : Boolean := False;
 350    --  Set to False by Initialize_ALI. Set to True if an ali file contains
 351    --  the No_Object flag.
 352
 353    Normalize_Scalars_Specified : Boolean := False;
 354    --  Set to False by Initialize_ALI. Set to True if an ali file indicates
 355    --  that the file was compiled in Normalize_Scalars mode.
 356
 357    No_Run_Time_Specified : Boolean := False;
 358    --  Set to False by Initialize_ALI, Set to True if an ali file indicates
 359    --  that the file was compiled in No_Run_Time mode.
 360
 361    Queuing_Policy_Specified : Character := ' ';
 362    --  Set to blank by Initialize_ALI. Set to the appropriate queuing policy
 363    --  character if an ali file contains a P line setting the queuing policy.
 364
 365    Restrictions : Restrictions_String := (others => 'n');
 366    --  This array records the cumulative contributions of R lines in all
 367    --  ali files. An entry is changed will be set to v if any ali file
 368    --  indicates that the restriction is violated, and otherwise will be
 369    --  set to r if the restriction is specified by some unit.
 370
 371    Static_Elaboration_Model_Used : Boolean := False;
 372    --  Set to False by Initialize_ALI. Set to True if any ALI file for a
 373    --  non-internal unit compiled with the static elaboration model is
 374    --  encountered.
 375
 376    Task_Dispatching_Policy_Specified : Character := ' ';
 377    --  Set to blank by Initialize_ALI. Set to the appropriate task dispatching
 378    --  policy character if an ali file contains a P line setting the
 379    --  task dispatching policy.
 380
 381    Unreserve_All_Interrupts_Specified : Boolean := False;
 382    --  Set to False by Initialize_ALI. Set to True if an ali file is read that
 383    --  has  P line specifying unreserve all interrupts mode.
 384
 385    Zero_Cost_Exceptions_Specified : Boolean := False;
 386    --  Set to False by Initialize_ALI. Set to True if an ali file is read that
 387    --  has a P line specifying the generation of zero cost exceptions.
 388
 389    -----------------
 390    -- Withs Table --
 391    -----------------
 392
 393    --  Each With line (W line) in an ALI file generates a Withs table entry
 394
 395    No_With_Id : constant With_Id := With_Id'First;
 396    --  Special value indicating no withs table entry
 397
 398    First_With_Entry : constant With_Id := No_With_Id + 1;
 399    --  Id of first actual entry in table
 400
 401    type With_Record is record
 402
 403       Uname : Unit_Name_Type;
 404       --  Name of Unit
 405
 406       Sfile : File_Name_Type;
 407       --  Name of source file, set to No_File in generic case
 408
 409       Afile : File_Name_Type;
 410       --  Name of ALI file, set to No_File in generic case
 411
 412       Elaborate : Boolean;
 413       --  Indicates presence of E parameter
 414
 415       Elaborate_All : Boolean;
 416       --  Indicates presence of EA parameter
 417
 418       Elab_All_Desirable : Boolean;
 419       --  Indicates presence of ED parameter
 420
 421    end record;
 422
 423    package Withs is new Table.Table (
 424      Table_Component_Type => With_Record,
 425      Table_Index_Type     => With_Id,
 426      Table_Low_Bound      => First_With_Entry,
 427      Table_Initial        => 5000,
 428      Table_Increment      => 200,
 429      Table_Name           => "Withs");
 430
 431    ---------------------
 432    -- Arguments Table --
 433    ---------------------
 434
 435    --  Each Arg line (A line) in an ALI file generates an Args table entry
 436
 437    No_Arg_Id : constant Arg_Id := Arg_Id'First;
 438    --  Special value indicating no args table entry
 439
 440    First_Arg_Entry : constant Arg_Id := No_Arg_Id + 1;
 441    --  Id of first actual entry in table
 442
 443    package Args is new Table.Table (
 444      Table_Component_Type => String_Ptr,
 445      Table_Index_Type     => Arg_Id,
 446      Table_Low_Bound      => First_Arg_Entry,
 447      Table_Initial        => 1000,
 448      Table_Increment      => 100,
 449      Table_Name           => "Args");
 450
 451    --------------------------
 452    -- Linker_Options Table --
 453    --------------------------
 454
 455    --  If an ALI file has one of more Linker_Options lines, then a single
 456    --  entry is made in this table. If more than one Linker_Options lines
 457    --  appears in a given ALI file, then the arguments are concatenated
 458    --  to form the entry in this table, using a NUL character as the
 459    --  separator, and a final NUL character is appended to the end.
 460
 461    type Linker_Option_Record is record
 462       Name : Name_Id;
 463       --  Name entry containing concatenated list of Linker_Options
 464       --  arguments separated by NUL and ended by NUL as described above.
 465
 466       Unit : Unit_Id;
 467       --  Unit_Id for the entry
 468
 469       Internal_File : Boolean;
 470       --  Set True if the linker options are from an internal file. This is
 471       --  used to insert certain standard entries after all the user entries
 472       --  but before the entries from the run-time.
 473
 474       Original_Pos : Positive;
 475       --  Keep track of original position in the linker options table. This
 476       --  is used to implement a stable sort when we sort the linker options
 477       --  table.
 478    end record;
 479
 480    --  Declare the Linker_Options Table
 481
 482    --  The indexes of active entries in this table range from 1 to the
 483    --  value of Linker_Options.Last. The zero'th element is for sort call.
 484
 485    package Linker_Options is new Table.Table (
 486      Table_Component_Type => Linker_Option_Record,
 487      Table_Index_Type     => Integer,
 488      Table_Low_Bound      => 0,
 489      Table_Initial        => 200,
 490      Table_Increment      => 400,
 491      Table_Name           => "Linker_Options");
 492
 493    -------------------------------------------
 494    -- External Version Reference Hash Table --
 495    -------------------------------------------
 496
 497    --  This hash table keeps track of external version reference strings
 498    --  as read from E lines in the ali file. The stored values do not
 499    --  include the terminating quote characters.
 500
 501    type Vindex is range 0 .. 98;
 502    --  Type to define range of headers
 503
 504    function SHash (S : String_Ptr) return Vindex;
 505    --  Hash function for this table
 506
 507    function SEq (F1, F2 : String_Ptr) return Boolean;
 508    --  Equality function for this table
 509
 510    package Version_Ref is new Simple_HTable (
 511      Header_Num => Vindex,
 512      Element    => Boolean,
 513      No_Element => False,
 514      Key        => String_Ptr,
 515      Hash       => SHash,
 516      Equal      => SEq);
 517
 518    ------------------------------------
 519    -- Sdep (Source Dependency) Table --
 520    ------------------------------------
 521
 522    --  Each source dependency (D line) in an ALI file generates an
 523    --  entry in the Sdep table.
 524
 525    No_Sdep_Id : constant Sdep_Id := Sdep_Id'First;
 526    --  Special value indicating no Sdep table entry
 527
 528    First_Sdep_Entry : constant Sdep_Id := No_Sdep_Id + 1;
 529    --  Id of first actual entry in table
 530
 531    type Sdep_Record is record
 532
 533       Sfile : File_Name_Type;
 534       --  Name of source file
 535
 536       Stamp : Time_Stamp_Type;
 537       --  Time stamp value. Note that this will be all zero characters
 538       --  for the dummy entries for missing or non-dependent files.
 539
 540       Checksum : Word;
 541       --  Checksum value. Note that this will be all zero characters
 542       --  for the dummy entries for missing or non-dependent files
 543
 544       Dummy_Entry : Boolean;
 545       --  Set True for dummy entries that correspond to missing files
 546       --  or files where no dependency relationship exists.
 547
 548       Subunit_Name : Name_Id;
 549       --  Name_Id for subunit name if present, else No_Name
 550
 551       Rfile : File_Name_Type;
 552       --  Reference file name. Same as Sfile unless a Source_Reference
 553       --  pragma was used, in which case it reflects the name used in
 554       --  the pragma.
 555
 556       Start_Line : Nat;
 557       --  Starting line number in file. Always 1, unless a Source_Reference
 558       --  pragma was used, in which case it reflects the line number value
 559       --  given in the pragma.
 560
 561    end record;
 562
 563    package Sdep is new Table.Table (
 564      Table_Component_Type => Sdep_Record,
 565      Table_Index_Type     => Sdep_Id,
 566      Table_Low_Bound      => First_Sdep_Entry,
 567      Table_Initial        => 5000,
 568      Table_Increment      => 200,
 569      Table_Name           => "Sdep");
 570
 571    ----------------------------
 572    -- Use of Name Table Info --
 573    ----------------------------
 574
 575    --  All unit names and file names are entered into the Names table. The
 576    --  Info fields of these entries are used as follows:
 577
 578    --    Unit name           Info field has Unit_Id of unit table entry
 579    --    ALI file name       Info field has ALI_Id of ALI table entry
 580    --    Source file name    Info field has Source_Id of source table entry
 581
 582    --------------------------
 583    -- Cross-Reference Data --
 584    --------------------------
 585
 586    --  The following table records cross-reference sections, there is one
 587    --  entry for each X header line in the ALI file for an xref section.
 588    --  Note that there will be no entries in this table if the Read_Xref
 589    --  parameter to Scan_ALI was set to False.
 590
 591    type Xref_Section_Record is record
 592       File_Num : Sdep_Id;
 593       --  Dependency number for file (entry in Sdep.Table)
 594
 595       File_Name : Name_Id;
 596       --  Name of file
 597
 598       First_Entity : Nat;
 599       --  First entry in Xref_Entity table
 600
 601       Last_Entity : Nat;
 602       --  Last entry in Xref_Entity table
 603
 604    end record;
 605
 606    package Xref_Section is new Table.Table (
 607      Table_Component_Type => Xref_Section_Record,
 608      Table_Index_Type     => Nat,
 609      Table_Low_Bound      => 1,
 610      Table_Initial        => 50,
 611      Table_Increment      => 300,
 612      Table_Name           => "Xref_Section");
 613
 614    --  The following is used to indicate whether a typeref field is present
 615    --  for the entity, and if so what kind of typeref field.
 616
 617    type Tref_Kind is (
 618      Tref_None,    --  No typeref present
 619      Tref_Access,  --  Access type typeref (points to designated type)
 620      Tref_Derived, --  Derived type typeref (points to parent type)
 621      Tref_Type);   --  All other cases
 622
 623    --  The following table records entities for which xrefs are recorded
 624
 625    type Xref_Entity_Record is record
 626       Line : Pos;
 627       --  Line number of definition
 628
 629       Etype : Character;
 630       --  Set to the identification character for the entity. See section
 631       --  "Cross-Reference Entity Identifiers in lib-xref.ads for details.
 632
 633       Col : Pos;
 634       --  Column number of definition
 635
 636       Lib : Boolean;
 637       --  True if entity is library level entity
 638
 639       Entity : Name_Id;
 640       --  Name of entity
 641
 642       Rref_Line : Nat;
 643       --  This field is set to the line number of a renaming reference if
 644       --  one is present, or to zero if no renaming reference is present
 645
 646       Rref_Col : Nat;
 647       --  This field is set to the column number of a renaming reference
 648       --  if one is present, or to zero if no renaming reference is present.
 649
 650       Tref : Tref_Kind;
 651       --  Indicates if a typeref is present, and if so what kind. Set to
 652       --  Tref_None if no typeref field is present.
 653
 654       Tref_File_Num : Sdep_Id;
 655       --  This field is set to No_Sdep_Id if no typeref is present, or
 656       --  if the typeref refers to an entity in standard. Otherwise it
 657       --  it is the dependency reference for the file containing the
 658       --  declaration of the typeref entity.
 659
 660       Tref_Line : Nat;
 661       --  This field is set to zero if no typeref is present, or if the
 662       --  typeref refers to an entity in standard. Otherwise it contains
 663       --  the line number of the declaration of the typeref entity.
 664
 665       Tref_Type : Character;
 666       --  This field is set to blank if no typeref is present, or if the
 667       --  typeref refers to an entity in standard. Otherwise it contains
 668       --  the identification character for the typeref entity. See section
 669       --  "Cross-Reference Entity Identifiers in lib-xref.ads for details.
 670
 671       Tref_Col : Nat;
 672       --  This field is set to zero if no typeref is present, or if the
 673       --  typeref refers to an entity in standard. Otherwise it contains
 674       --  the column number of the declaration of the parent type.
 675
 676       Tref_Standard_Entity : Name_Id;
 677       --  This field is set to No_Name if no typeref is present or if the
 678       --  typeref refers to a declared entity rather than an entity in
 679       --  package Standard. If there is a typeref that references an
 680       --  entity in package Standard, then this field is a Name_Id
 681       --  reference for the entity name.
 682
 683       First_Xref : Nat;
 684       --  Index into Xref table of first cross-reference
 685
 686       Last_Xref : Nat;
 687       --  Index into Xref table of last cross-reference. The value in
 688       --  Last_Xref can be less than the First_Xref value to indicate
 689       --  that no entries are present in the Xref Table.
 690    end record;
 691
 692    package Xref_Entity is new Table.Table (
 693      Table_Component_Type => Xref_Entity_Record,
 694      Table_Index_Type     => Nat,
 695      Table_Low_Bound      => 1,
 696      Table_Initial        => 500,
 697      Table_Increment      => 300,
 698      Table_Name           => "Xref_Entity");
 699
 700    --  The following table records actual cross-references
 701
 702    type Xref_Record is record
 703       File_Num : Sdep_Id;
 704       --  Set to the file dependency number for the cross-reference. Note
 705       --  that if no file entry is present explicitly, this is just a copy
 706       --  of the reference for the current cross-reference section.
 707
 708       Line : Pos;
 709       --  Line number for the reference
 710
 711       Rtype : Character;
 712       --  Indicates type of reference, using code used in ALI file:
 713       --    r = reference
 714       --    m = modification
 715       --    b = body entity
 716       --    c = completion of private or incomplete type
 717       --    x = type extension
 718       --    i = implicit reference
 719       --  See description in lib-xref.ads for further details
 720
 721       Col : Nat;
 722       --  Column number for the reference
 723
 724       --  Note: for instantiation references, Rtype is set to ' ', and Col is
 725       --  set to zero. One or more such entries can follow any other reference.
 726    end record;
 727
 728    package Xref is new Table.Table (
 729      Table_Component_Type => Xref_Record,
 730      Table_Index_Type     => Nat,
 731      Table_Low_Bound      => 1,
 732      Table_Initial        => 2000,
 733      Table_Increment      => 300,
 734      Table_Name           => "Xref");
 735
 736    --------------------------------------
 737    -- Subprograms for Reading ALI File --
 738    --------------------------------------
 739
 740    procedure Initialize_ALI;
 741    --  Initialize the ALI tables. Also resets all switch values to defaults.
 742
 743    function Scan_ALI
 744      (F         : File_Name_Type;
 745       T         : Text_Buffer_Ptr;
 746       Ignore_ED : Boolean;
 747       Err       : Boolean;
 748       Read_Xref : Boolean := False)
 749       return      ALI_Id;
 750    --  Given the text, T, of an ALI file, F, scan and store the information
 751    --  from the file, and return the Id of the resulting entry in the ALI
 752    --  table. Switch settings may be modified as described above in the
 753    --  switch description settings.
 754    --
 755    --    Ignore_ED is normally False. If set to True, it indicates that
 756    --    all ED (elaboration desirable) indications in the ALI file are
 757    --    to be ignored.
 758    --
 759    --    Err determines the action taken on an incorrectly formatted file.
 760    --    If Err is False, then an error message is output, and the program
 761    --    is terminated. If Err is True, then no error message is output,
 762    --    and No_ALI_Id is returned.
 763    --
 764    --    Read_XREF is set True to read and acquire the cross-reference
 765    --    information, otherwise the scan is terminated when a cross-
 766    --    reference line is encountered.
 767
 768 end ALI;