gcc/ada/ali.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                                  A L I                                   --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2005 Free Software Foundation, Inc.          --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  19 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  20 -- MA 02111-1307, USA.                                                      --
  21 --                                                                          --
  22 -- GNAT was originally developed  by the GNAT team at  New York University. --
  23 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  24 --                                                                          --
  25 ------------------------------------------------------------------------------
  26
  27 --  This package defines the internal data structures used for representation
  28 --  of Ada Library Information (ALI) acquired from the ALI files generated
  29 --  by the front end.
  30
  31 with Casing;  use Casing;
  32 with Gnatvsn; use Gnatvsn;
  33 with Rident;  use Rident;
  34 with Table;
  35 with Types;   use Types;
  36
  37 with GNAT.HTable; use GNAT.HTable;
  38
  39 package ALI is
  40
  41    --------------
  42    -- Id Types --
  43    --------------
  44
  45    --  The various entries are stored in tables with distinct subscript
  46    --  ranges. The following type definitions indicate the ranges used
  47    --  for the subscripts (Id values) for the various tables.
  48
  49    type ALI_Id is range 0 .. 999_999;
  50    --  Id values used for ALIs table entries
  51
  52    type Unit_Id is range 1_000_000 .. 1_999_999;
  53    --  Id values used for Unit table entries
  54
  55    type With_Id is range 2_000_000 .. 2_999_999;
  56    --  Id values used for Withs table entries
  57
  58    type Arg_Id is range 3_000_000 .. 3_999_999;
  59    --  Id values used for argument table entries
  60
  61    type Sdep_Id is range 4_000_000 .. 4_999_999;
  62    --  Id values used for Sdep table entries
  63
  64    type Source_Id is range 5_000_000 .. 5_999_999;
  65    --  Id values used for Source table entries
  66
  67    type Interrupt_State_Id is range 6_000_000 .. 6_999_999;
  68    --  Id values used for Interrupt_State table entries
  69
  70    --------------------
  71    -- ALI File Table --
  72    --------------------
  73
  74    --  Each ALI file read generates an entry in the ALIs table
  75
  76    No_ALI_Id : constant ALI_Id := ALI_Id'First;
  77    --  Special value indicating no ALI entry
  78
  79    First_ALI_Entry : constant ALI_Id := No_ALI_Id + 1;
  80    --  Id of first actual entry in table
  81
  82    type Main_Program_Type is (None, Proc, Func);
  83    --  Indicator of whether unit can be used as main program
  84
  85    type ALIs_Record is record
  86
  87       Afile : File_Name_Type;
  88       --  Name of ALI file
  89
  90       Ofile_Full_Name : Name_Id;
  91       --  Full name of object file corresponding to the ALI file
  92
  93       Sfile : File_Name_Type;
  94       --  Name of source file that generates this ALI file (which is equal
  95       --  to the name of the source file in the first unit table entry for
  96       --  this ALI file, since the body if present is always first).
  97
  98       Ver : String (1 .. Ver_Len_Max);
  99       --  Value of library version (V line in ALI file). Not set if
 100       --  V lines are ignored as a result of the Ignore_Lines parameter.
 101
 102       Ver_Len : Natural;
 103       --  Length of characters stored in Ver. Not set if V lines are
 104       --  ignored as a result of the Ignore_Lines parameter.
 105
 106       SAL_Interface : Boolean;
 107       --  Set True when this is an interface to a standalone library
 108
 109       First_Unit : Unit_Id;
 110       --  Id of first Unit table entry for this file
 111
 112       Last_Unit : Unit_Id;
 113       --  Id of last Unit table entry for this file
 114
 115       First_Sdep : Sdep_Id;
 116       --  Id of first Sdep table entry for this file
 117
 118       Last_Sdep : Sdep_Id;
 119       --  Id of last Sdep table entry for this file
 120
 121       Main_Program : Main_Program_Type;
 122       --  Indicator of whether first unit can be used as main program.
 123       --  Not set if 'M' appears in Ignore_Lines.
 124
 125       Main_Priority : Int;
 126       --  Indicates priority value if Main_Program field indicates that
 127       --  this can be a main program. A value of -1 (No_Main_Priority)
 128       --  indicates that no parameter was found, or no M line was present.
 129       --  Not set if 'M' appears in Ignore_Lines.
 130
 131       Time_Slice_Value : Int;
 132       --  Indicates value of time slice parameter from T=xxx on main program
 133       --  line. A value of -1 indicates that no T=xxx parameter was found,
 134       --  or no M line was present.
 135       --  Not set if 'M' appears in Ignore_Lines.
 136
 137       WC_Encoding : Character;
 138       --  Wide character encoding if main procedure. Otherwise not relevant.
 139       --  Not set if 'M' appears in Ignore_Lines.
 140
 141       Locking_Policy : Character;
 142       --  Indicates locking policy for units in this file. Space means
 143       --  tasking was not used, or that no Locking_Policy pragma was
 144       --  present or that this is a language defined unit. Otherwise set
 145       --  to first character (upper case) of policy name.
 146       --  Not set if 'P' appears in Ignore_Lines.
 147
 148       Queuing_Policy : Character;
 149       --  Indicates queuing policy for units in this file. Space means
 150       --  tasking was not used, or that no Queuing_Policy pragma was
 151       --  present or that this is a language defined unit. Otherwise set
 152       --  to first character (upper case) of policy name.
 153       --  Not set if 'P' appears in Ignore_Lines.
 154
 155       Task_Dispatching_Policy : Character;
 156       --  Indicates task dispatching policy for units in this file. Space
 157       --  means tasking was not used, or that no Task_Dispatching_Policy
 158       --  pragma was present or that this is a language defined unit.
 159       --  Otherwise set to first character (upper case) of policy name.
 160       --  Not set if 'P' appears in Ignore_Lines.
 161
 162       Compile_Errors : Boolean;
 163       --  Set to True if compile errors for unit. Note that No_Object
 164       --  will always be set as well in this case.
 165       --  Not set if 'P' appears in Ignore_Lines.
 166
 167       Float_Format : Character;
 168       --  Set to float format (set to I if no float-format given).
 169       --  Not set if 'P' appears in Ignore_Lines.
 170
 171       No_Object : Boolean;
 172       --  Set to True if no object file generated.
 173       --  Not set if 'P' appears in Ignore_Lines.
 174
 175       Normalize_Scalars : Boolean;
 176       --  Set to True if file was compiled with Normalize_Scalars.
 177       --  Not set if 'P' appears in Ignore_Lines.
 178
 179       Unit_Exception_Table : Boolean;
 180       --  Set to True if unit exception table pointer generated.
 181       --  Not set if 'P' appears in Ignore_Lines.
 182
 183       Zero_Cost_Exceptions : Boolean;
 184       --  Set to True if file was compiled with zero cost exceptions.
 185       --  Not set if 'P' appears in Ignore_Lines.
 186
 187       Restrictions : Restrictions_Info;
 188       --  Restrictions information reconstructed from R lines
 189
 190       First_Interrupt_State : Interrupt_State_Id;
 191       Last_Interrupt_State  : Interrupt_State_Id'Base;
 192       --  These point to the first and last entries in the interrupt
 193       --  state table for this unit. If there are no entries, then
 194       --  Last_Interrupt_State = First_Interrupt_State - 1 (that's
 195       --  why the 'Base reference is there, it can be one less than
 196       --  the lower bound of the subtype).
 197       --  Not set if 'I' appears in Ignore_Lines
 198
 199    end record;
 200
 201    No_Main_Priority : constant Int := -1;
 202    --  Code for no main priority set
 203
 204    package ALIs is new Table.Table (
 205      Table_Component_Type => ALIs_Record,
 206      Table_Index_Type     => ALI_Id,
 207      Table_Low_Bound      => First_ALI_Entry,
 208      Table_Initial        => 500,
 209      Table_Increment      => 200,
 210      Table_Name           => "ALIs");
 211
 212    ----------------
 213    -- Unit Table --
 214    ----------------
 215
 216    --  Each unit within an ALI file generates an entry in the unit table
 217
 218    No_Unit_Id : constant Unit_Id := Unit_Id'First;
 219    --  Special value indicating no unit table entry
 220
 221    First_Unit_Entry : constant Unit_Id := No_Unit_Id + 1;
 222    --  Id of first actual entry in table
 223
 224    type Unit_Type is (Is_Spec, Is_Body, Is_Spec_Only, Is_Body_Only);
 225    --  Indicates type of entry, if both body and spec appear in the ALI file,
 226    --  then the first unit is marked Is_Body, and the second is marked Is_Spec.
 227    --  If only a spec appears, then it is marked as Is_Spec_Only, and if only
 228    --  a body appears, then it is marked Is_Body_Only).
 229
 230    subtype Version_String is String (1 .. 8);
 231    --  Version string, taken from unit record
 232
 233    type Unit_Record is record
 234
 235       My_ALI : ALI_Id;
 236       --  Corresponding ALI entry
 237
 238       Uname : Unit_Name_Type;
 239       --  Name of Unit
 240
 241       Sfile : File_Name_Type;
 242       --  Name of source file
 243
 244       Preelab : Boolean;
 245       --  Indicates presence of PR parameter for a preelaborated package
 246
 247       No_Elab : Boolean;
 248       --  Indicates presence of NE parameter for a unit that has does not
 249       --  have an elaboration routine (since it has no elaboration code).
 250
 251       Pure : Boolean;
 252       --  Indicates presence of PU parameter for a pure package
 253
 254       Dynamic_Elab : Boolean;
 255       --  Set to True if the unit was compiled with dynamic elaboration
 256       --  checks (i.e. either -gnatE or pragma Elaboration_Checks (RM)
 257       --  was used to compile the unit).
 258
 259       Elaborate_Body : Boolean;
 260       --  Indicates presence of EB parameter for a package which has a
 261       --  pragma Preelaborate_Body.
 262
 263       Set_Elab_Entity : Boolean;
 264       --  Indicates presence of EE parameter for a unit which has an
 265       --  elaboration entity which must be set true as part of the
 266       --  elaboration of the entity.
 267
 268       Has_RACW : Boolean;
 269       --  Indicates presence of RA parameter for a package that declares
 270       --  at least one Remote Access to Class_Wide (RACW) object.
 271
 272       Remote_Types : Boolean;
 273       --  Indicates presence of RT parameter for a package which has a
 274       --  pragma Remote_Types.
 275
 276       Shared_Passive : Boolean;
 277       --  Indicates presence of SP parameter for a package which has a
 278       --  pragma Shared_Passive.
 279
 280       RCI : Boolean;
 281       --  Indicates presence of RC parameter for a package which has a
 282       --  pragma Remote_Call_Interface.
 283
 284       Predefined : Boolean;
 285       --  Indicates if unit is language predefined (or a child of such a unit)
 286
 287       Internal : Boolean;
 288       --  Indicates if unit is an internal unit (or a child of such a unit)
 289
 290       First_With : With_Id;
 291       --  Id of first withs table entry for this file
 292
 293       Last_With : With_Id;
 294       --  Id of last withs table entry for this file
 295
 296       First_Arg : Arg_Id;
 297       --  Id of first args table entry for this file
 298
 299       Last_Arg : Arg_Id;
 300       --  Id of last args table entry for this file
 301
 302       Utype : Unit_Type;
 303       --  Type of entry
 304
 305       Is_Generic : Boolean;
 306       --  True for generic unit (i.e. a generic declaration, or a generic
 307       --  body). False for a non-generic unit.
 308
 309       Unit_Kind : Character;
 310       --  Indicates the nature of the unit. 'p' for Packages and 's' for
 311       --  subprograms.
 312
 313       Version : Version_String;
 314       --  Version of unit
 315
 316       Icasing : Casing_Type;
 317       --  Indicates casing of identifiers in source file for this unit. This
 318       --  is used for informational output, and also for constructing the
 319       --  main unit if it is being built in Ada.
 320
 321       Kcasing : Casing_Type;
 322       --  Indicates casing of keyowords in source file for this unit. This
 323       --  is used for informational output, and also for constructing the
 324       --  main unit if it is being built in Ada.
 325
 326       Elab_Position : aliased Natural;
 327       --  Initialized to zero. Set non-zero when a unit is chosen and
 328       --  placed in the elaboration order. The value represents the
 329       --  ordinal position in the elaboration order.
 330
 331       Init_Scalars : Boolean;
 332       --  Set True if IS qualifier appears in ALI file, indicating that
 333       --  an Initialize_Scalars pragma applies to the unit.
 334
 335       SAL_Interface : Boolean;
 336       --  Set True when this is an interface to a standalone library
 337
 338       Body_Needed_For_SAL : Boolean;
 339       --  Indicates that the source for the body of the unit (subprogram,
 340       --  package, or generic unit) must be included in a standalone library.
 341    end record;
 342
 343    package Units is new Table.Table (
 344      Table_Component_Type => Unit_Record,
 345      Table_Index_Type     => Unit_Id,
 346      Table_Low_Bound      => First_Unit_Entry,
 347      Table_Initial        => 100,
 348      Table_Increment      => 200,
 349      Table_Name           => "Unit");
 350
 351    ---------------------------
 352    -- Interrupt State Table --
 353    ---------------------------
 354
 355    --  An entry is made in this table for each I (interrupt state) line
 356    --  encountered in the input ALI file. The First/Last_Interrupt_Id
 357    --  fields of the ALI file entry show the range of entries defined
 358    --  within a particular ALI file.
 359
 360    type Interrupt_State_Record is record
 361       Interrupt_Id : Nat;
 362       --  Id from interrupt state entry
 363
 364       Interrupt_State : Character;
 365       --  State from interrupt state entry ('u'/'r'/'s')
 366
 367       IS_Pragma_Line : Nat;
 368       --  Line number of Interrupt_State pragma
 369    end record;
 370
 371    package Interrupt_States is new Table.Table (
 372      Table_Component_Type => Interrupt_State_Record,
 373      Table_Index_Type     => Interrupt_State_Id'Base,
 374      Table_Low_Bound      => Interrupt_State_Id'First,
 375      Table_Initial        => 100,
 376      Table_Increment      => 200,
 377      Table_Name           => "Interrupt_States");
 378
 379    --------------
 380    -- Switches --
 381    --------------
 382
 383    --  These switches record status information about ali files that
 384    --  have been read, for quick reference without searching tables.
 385
 386    --  Note: a switch will be left set at its default value if the line
 387    --  which might otherwise set it is ignored (from Ignore_Lines).
 388
 389    Dynamic_Elaboration_Checks_Specified : Boolean := False;
 390    --  Set to False by Initialize_ALI. Set to True if Scan_ALI reads
 391    --  a unit for which dynamic elaboration checking is enabled.
 392
 393    Float_Format_Specified : Character := ' ';
 394    --  Set to blank by Initialize_ALI. Set to appropriate float format
 395    --  character (V or I, see Opt.Float_Format) if an an ali file that
 396    --  is read contains an F line setting the floating point format.
 397
 398    Initialize_Scalars_Used : Boolean := False;
 399    --  Set True if an ali file contains the Initialize_Scalars flag
 400
 401    Locking_Policy_Specified : Character := ' ';
 402    --  Set to blank by Initialize_ALI. Set to the appropriate locking policy
 403    --  character if an ali file contains a P line setting the locking policy.
 404
 405    No_Normalize_Scalars_Specified : Boolean := False;
 406    --  Set to False by Initialize_ALI. Set to True if an ali file indicates
 407    --  that the file was compiled without normalize scalars.
 408
 409    No_Object_Specified : Boolean := False;
 410    --  Set to False by Initialize_ALI. Set to True if an ali file contains
 411    --  the No_Object flag.
 412
 413    Normalize_Scalars_Specified : Boolean := False;
 414    --  Set to False by Initialize_ALI. Set to True if an ali file indicates
 415    --  that the file was compiled in Normalize_Scalars mode.
 416
 417    Queuing_Policy_Specified : Character := ' ';
 418    --  Set to blank by Initialize_ALI. Set to the appropriate queuing policy
 419    --  character if an ali file contains a P line setting the queuing policy.
 420
 421    Cumulative_Restrictions : Restrictions_Info;
 422    --  This variable records the cumulative contributions of R lines in all
 423    --  ali files, showing whether a restriction pragma exists anywhere, and
 424    --  accumulating the aggregate knowledge of violations.
 425
 426    Static_Elaboration_Model_Used : Boolean := False;
 427    --  Set to False by Initialize_ALI. Set to True if any ALI file for a
 428    --  non-internal unit compiled with the static elaboration model is
 429    --  encountered.
 430
 431    Task_Dispatching_Policy_Specified : Character := ' ';
 432    --  Set to blank by Initialize_ALI. Set to the appropriate task dispatching
 433    --  policy character if an ali file contains a P line setting the
 434    --  task dispatching policy.
 435
 436    Unreserve_All_Interrupts_Specified : Boolean := False;
 437    --  Set to False by Initialize_ALI. Set to True if an ali file is read that
 438    --  has  P line specifying unreserve all interrupts mode.
 439
 440    Zero_Cost_Exceptions_Specified : Boolean := False;
 441    --  Set to False by Initialize_ALI. Set to True if an ali file is read that
 442    --  has a P line specifying the generation of zero cost exceptions.
 443
 444    -----------------
 445    -- Withs Table --
 446    -----------------
 447
 448    --  Each With line (W line) in an ALI file generates a Withs table entry
 449
 450    --  Note: there will be no entries in this table if 'W' lines are ignored
 451
 452    No_With_Id : constant With_Id := With_Id'First;
 453    --  Special value indicating no withs table entry
 454
 455    First_With_Entry : constant With_Id := No_With_Id + 1;
 456    --  Id of first actual entry in table
 457
 458    type With_Record is record
 459
 460       Uname : Unit_Name_Type;
 461       --  Name of Unit
 462
 463       Sfile : File_Name_Type;
 464       --  Name of source file, set to No_File in generic case
 465
 466       Afile : File_Name_Type;
 467       --  Name of ALI file, set to No_File in generic case
 468
 469       Elaborate : Boolean;
 470       --  Indicates presence of E parameter
 471
 472       Elaborate_All : Boolean;
 473       --  Indicates presence of EA parameter
 474
 475       Elab_All_Desirable : Boolean;
 476       --  Indicates presence of ED parameter
 477
 478       SAL_Interface : Boolean := False;
 479       --  True if the Unit is an Interface of a Stand-Alone Library
 480
 481    end record;
 482
 483    package Withs is new Table.Table (
 484      Table_Component_Type => With_Record,
 485      Table_Index_Type     => With_Id,
 486      Table_Low_Bound      => First_With_Entry,
 487      Table_Initial        => 5000,
 488      Table_Increment      => 200,
 489      Table_Name           => "Withs");
 490
 491    ---------------------
 492    -- Arguments Table --
 493    ---------------------
 494
 495    --  Each Arg line (A line) in an ALI file generates an Args table entry
 496
 497    --  Note: there will be no entries in this table if 'A' lines are ignored
 498
 499    No_Arg_Id : constant Arg_Id := Arg_Id'First;
 500    --  Special value indicating no args table entry
 501
 502    First_Arg_Entry : constant Arg_Id := No_Arg_Id + 1;
 503    --  Id of first actual entry in table
 504
 505    package Args is new Table.Table (
 506      Table_Component_Type => String_Ptr,
 507      Table_Index_Type     => Arg_Id,
 508      Table_Low_Bound      => First_Arg_Entry,
 509      Table_Initial        => 1000,
 510      Table_Increment      => 100,
 511      Table_Name           => "Args");
 512
 513    --------------------------
 514    -- Linker_Options Table --
 515    --------------------------
 516
 517    --  If an ALI file has one of more Linker_Options lines, then a single
 518    --  entry is made in this table. If more than one Linker_Options lines
 519    --  appears in a given ALI file, then the arguments are concatenated
 520    --  to form the entry in this table, using a NUL character as the
 521    --  separator, and a final NUL character is appended to the end.
 522
 523    --  Note: there will be no entries in this table if 'L' lines are ignored
 524
 525    type Linker_Option_Record is record
 526       Name : Name_Id;
 527       --  Name entry containing concatenated list of Linker_Options
 528       --  arguments separated by NUL and ended by NUL as described above.
 529
 530       Unit : Unit_Id;
 531       --  Unit_Id for the entry
 532
 533       Internal_File : Boolean;
 534       --  Set True if the linker options are from an internal file. This is
 535       --  used to insert certain standard entries after all the user entries
 536       --  but before the entries from the run-time.
 537
 538       Original_Pos : Positive;
 539       --  Keep track of original position in the linker options table. This
 540       --  is used to implement a stable sort when we sort the linker options
 541       --  table.
 542    end record;
 543
 544    --  Declare the Linker_Options Table
 545
 546    --  The indexes of active entries in this table range from 1 to the
 547    --  value of Linker_Options.Last. The zero'th element is for sort call.
 548
 549    package Linker_Options is new Table.Table (
 550      Table_Component_Type => Linker_Option_Record,
 551      Table_Index_Type     => Integer,
 552      Table_Low_Bound      => 0,
 553      Table_Initial        => 200,
 554      Table_Increment      => 400,
 555      Table_Name           => "Linker_Options");
 556
 557    -------------------------------------------
 558    -- External Version Reference Hash Table --
 559    -------------------------------------------
 560
 561    --  This hash table keeps track of external version reference strings
 562    --  as read from E lines in the ali file. The stored values do not
 563    --  include the terminating quote characters.
 564
 565    --  Note: there will be no entries in this table if 'E' lines are ignored
 566
 567    type Vindex is range 0 .. 98;
 568    --  Type to define range of headers
 569
 570    function SHash (S : String_Ptr) return Vindex;
 571    --  Hash function for this table
 572
 573    function SEq (F1, F2 : String_Ptr) return Boolean;
 574    --  Equality function for this table
 575
 576    package Version_Ref is new Simple_HTable (
 577      Header_Num => Vindex,
 578      Element    => Boolean,
 579      No_Element => False,
 580      Key        => String_Ptr,
 581      Hash       => SHash,
 582      Equal      => SEq);
 583
 584    -------------------------
 585    -- No_Dependency Table --
 586    -------------------------
 587
 588    --  Each R line for a No_Dependency Restriction generates an entry in
 589    --  this No_Dependency table.
 590
 591    type No_Dep_Record is record
 592       ALI_File : ALI_Id;
 593       --  ALI File containing tne entry
 594
 595       No_Dep_Unit : Name_Id;
 596       --  Id for names table entry including entire name, including periods.
 597    end record;
 598
 599    package No_Deps is new Table.Table (
 600      Table_Component_Type => No_Dep_Record,
 601      Table_Index_Type     => Integer,
 602      Table_Low_Bound      => 0,
 603      Table_Initial        => 200,
 604      Table_Increment      => 400,
 605      Table_Name           => "No_Deps");
 606
 607    ------------------------------------
 608    -- Sdep (Source Dependency) Table --
 609    ------------------------------------
 610
 611    --  Each source dependency (D line) in an ALI file generates an
 612    --  entry in the Sdep table.
 613
 614    --  Note: there will be no entries in this table if 'D' lines are ignored
 615
 616    No_Sdep_Id : constant Sdep_Id := Sdep_Id'First;
 617    --  Special value indicating no Sdep table entry
 618
 619    First_Sdep_Entry : Sdep_Id := No_Sdep_Id + 1;
 620    --  Id of first Sdep entry for current ali file. This is initialized to
 621    --  the first Sdep entry in the table, and then incremented appropriately
 622    --  as successive ALI files are scanned.
 623
 624    type Sdep_Record is record
 625
 626       Sfile : File_Name_Type;
 627       --  Name of source file
 628
 629       Stamp : Time_Stamp_Type;
 630       --  Time stamp value. Note that this will be all zero characters
 631       --  for the dummy entries for missing or non-dependent files.
 632
 633       Checksum : Word;
 634       --  Checksum value. Note that this will be all zero characters
 635       --  for the dummy entries for missing or non-dependent files
 636
 637       Dummy_Entry : Boolean;
 638       --  Set True for dummy entries that correspond to missing files
 639       --  or files where no dependency relationship exists.
 640
 641       Subunit_Name : Name_Id;
 642       --  Name_Id for subunit name if present, else No_Name
 643
 644       Rfile : File_Name_Type;
 645       --  Reference file name. Same as Sfile unless a Source_Reference
 646       --  pragma was used, in which case it reflects the name used in
 647       --  the pragma.
 648
 649       Start_Line : Nat;
 650       --  Starting line number in file. Always 1, unless a Source_Reference
 651       --  pragma was used, in which case it reflects the line number value
 652       --  given in the pragma.
 653
 654    end record;
 655
 656    package Sdep is new Table.Table (
 657      Table_Component_Type => Sdep_Record,
 658      Table_Index_Type     => Sdep_Id,
 659      Table_Low_Bound      => First_Sdep_Entry,
 660      Table_Initial        => 5000,
 661      Table_Increment      => 200,
 662      Table_Name           => "Sdep");
 663
 664    ----------------------------
 665    -- Use of Name Table Info --
 666    ----------------------------
 667
 668    --  All unit names and file names are entered into the Names table. The
 669    --  Info fields of these entries are used as follows:
 670
 671    --    Unit name           Info field has Unit_Id of unit table entry
 672    --    ALI file name       Info field has ALI_Id of ALI table entry
 673    --    Source file name    Info field has Source_Id of source table entry
 674
 675    --------------------------
 676    -- Cross-Reference Data --
 677    --------------------------
 678
 679    --  The following table records cross-reference sections, there is one
 680    --  entry for each X header line in the ALI file for an xref section.
 681
 682    --  Note: there will be no entries in this table if 'X' lines are ignored
 683
 684    type Xref_Section_Record is record
 685       File_Num : Sdep_Id;
 686       --  Dependency number for file (entry in Sdep.Table)
 687
 688       File_Name : Name_Id;
 689       --  Name of file
 690
 691       First_Entity : Nat;
 692       --  First entry in Xref_Entity table
 693
 694       Last_Entity : Nat;
 695       --  Last entry in Xref_Entity table
 696    end record;
 697
 698    package Xref_Section is new Table.Table (
 699      Table_Component_Type => Xref_Section_Record,
 700      Table_Index_Type     => Nat,
 701      Table_Low_Bound      => 1,
 702      Table_Initial        => 50,
 703      Table_Increment      => 300,
 704      Table_Name           => "Xref_Section");
 705
 706    --  The following is used to indicate whether a typeref field is present
 707    --  for the entity, and if so what kind of typeref field.
 708
 709    type Tref_Kind is (
 710      Tref_None,    --  No typeref present
 711      Tref_Access,  --  Access type typeref (points to designated type)
 712      Tref_Derived, --  Derived type typeref (points to parent type)
 713      Tref_Type);   --  All other cases
 714
 715    --  The following table records entities for which xrefs are recorded
 716
 717    type Xref_Entity_Record is record
 718       Line : Pos;
 719       --  Line number of definition
 720
 721       Etype : Character;
 722       --  Set to the identification character for the entity. See section
 723       --  "Cross-Reference Entity Identifiers" in lib-xref.ads for details.
 724
 725       Col : Pos;
 726       --  Column number of definition
 727
 728       Lib : Boolean;
 729       --  True if entity is library level entity
 730
 731       Entity : Name_Id;
 732       --  Name of entity
 733
 734       Rref_Line : Nat;
 735       --  This field is set to the line number of a renaming reference if
 736       --  one is present, or to zero if no renaming reference is present
 737
 738       Rref_Col : Nat;
 739       --  This field is set to the column number of a renaming reference
 740       --  if one is present, or to zero if no renaming reference is present.
 741
 742       Tref : Tref_Kind;
 743       --  Indicates if a typeref is present, and if so what kind. Set to
 744       --  Tref_None if no typeref field is present.
 745
 746       Tref_File_Num : Sdep_Id;
 747       --  This field is set to No_Sdep_Id if no typeref is present, or
 748       --  if the typeref refers to an entity in standard. Otherwise it
 749       --  it is the dependency reference for the file containing the
 750       --  declaration of the typeref entity.
 751
 752       Tref_Line : Nat;
 753       --  This field is set to zero if no typeref is present, or if the
 754       --  typeref refers to an entity in standard. Otherwise it contains
 755       --  the line number of the declaration of the typeref entity.
 756
 757       Tref_Type : Character;
 758       --  This field is set to blank if no typeref is present, or if the
 759       --  typeref refers to an entity in standard. Otherwise it contains
 760       --  the identification character for the typeref entity. See section
 761       --  "Cross-Reference Entity Identifiers" in lib-xref.ads for details.
 762
 763       Tref_Col : Nat;
 764       --  This field is set to zero if no typeref is present, or if the
 765       --  typeref refers to an entity in standard. Otherwise it contains
 766       --  the column number of the declaration of the parent type.
 767
 768       Tref_Standard_Entity : Name_Id;
 769       --  This field is set to No_Name if no typeref is present or if the
 770       --  typeref refers to a declared entity rather than an entity in
 771       --  package Standard. If there is a typeref that references an
 772       --  entity in package Standard, then this field is a Name_Id
 773       --  reference for the entity name.
 774
 775       First_Xref : Nat;
 776       --  Index into Xref table of first cross-reference
 777
 778       Last_Xref : Nat;
 779       --  Index into Xref table of last cross-reference. The value in
 780       --  Last_Xref can be less than the First_Xref value to indicate
 781       --  that no entries are present in the Xref Table.
 782    end record;
 783
 784    package Xref_Entity is new Table.Table (
 785      Table_Component_Type => Xref_Entity_Record,
 786      Table_Index_Type     => Nat,
 787      Table_Low_Bound      => 1,
 788      Table_Initial        => 500,
 789      Table_Increment      => 300,
 790      Table_Name           => "Xref_Entity");
 791
 792    --  The following table records actual cross-references
 793
 794    type Xref_Record is record
 795       File_Num : Sdep_Id;
 796       --  Set to the file dependency number for the cross-reference. Note
 797       --  that if no file entry is present explicitly, this is just a copy
 798       --  of the reference for the current cross-reference section.
 799
 800       Line : Pos;
 801       --  Line number for the reference
 802
 803       Rtype : Character;
 804       --  Indicates type of reference, using code used in ALI file:
 805       --    r = reference
 806       --    m = modification
 807       --    b = body entity
 808       --    c = completion of private or incomplete type
 809       --    x = type extension
 810       --    i = implicit reference
 811       --  See description in lib-xref.ads for further details
 812
 813       Col : Nat;
 814       --  Column number for the reference
 815
 816       --  Note: for instantiation references, Rtype is set to ' ', and Col is
 817       --  set to zero. One or more such entries can follow any other reference.
 818    end record;
 819
 820    package Xref is new Table.Table (
 821      Table_Component_Type => Xref_Record,
 822      Table_Index_Type     => Nat,
 823      Table_Low_Bound      => 1,
 824      Table_Initial        => 2000,
 825      Table_Increment      => 300,
 826      Table_Name           => "Xref");
 827
 828    --------------------------------------
 829    -- Subprograms for Reading ALI File --
 830    --------------------------------------
 831
 832    procedure Initialize_ALI;
 833    --  Initialize the ALI tables. Also resets all switch values to defaults
 834
 835    function Scan_ALI
 836      (F             : File_Name_Type;
 837       T             : Text_Buffer_Ptr;
 838       Ignore_ED     : Boolean;
 839       Err           : Boolean;
 840       Read_Xref     : Boolean := False;
 841       Read_Lines    : String  := "";
 842       Ignore_Lines  : String  := "X";
 843       Ignore_Errors : Boolean := False) return ALI_Id;
 844    --  Given the text, T, of an ALI file, F, scan and store the information
 845    --  from the file, and return the Id of the resulting entry in the ALI
 846    --  table. Switch settings may be modified as described above in the
 847    --  switch description settings.
 848    --
 849    --    Ignore_ED is normally False. If set to True, it indicates that
 850    --    all ED (elaboration desirable) indications in the ALI file are
 851    --    to be ignored.
 852    --
 853    --    Err determines the action taken on an incorrectly formatted file.
 854    --    If Err is False, then an error message is output, and the program
 855    --    is terminated. If Err is True, then no error message is output,
 856    --    and No_ALI_Id is returned.
 857    --
 858    --    Ignore_Lines requests that Scan_ALI ignore any lines that start
 859    --    with any given key character. The default value of X causes all
 860    --    Xref lines to be ignored. The corresponding data in the ALI
 861    --    tables will not be filled in in this case. It is not possible
 862    --    to ignore U (unit) lines, they are always read.
 863    --
 864    --    Read_Lines requests that Scan_ALI process only lines that start
 865    --    with one of the given characters. The corresponding data in the
 866    --    ALI file for any characters not given in the list will not be
 867    --    set. The default value of the null string indicates that all
 868    --    lines should be read (unless Ignore_Lines is specified). U
 869    --    (unit) lines are always read regardless of the value of this
 870    --    parameter.
 871    --
 872    --    Note: either Ignore_Lines or Read_Lines should be non-null.
 873    --    but not both. If both are given then only the Read_Lines
 874    --    value is processed, and the Ignore_Lines parameter is
 875    --    not processed.
 876    --
 877    --    Read_XREF is set True to read and acquire the cross-reference
 878    --    information. If Read_XREF is set to True, then the effect is
 879    --    to ignore all lines other than U, W, D and X lines and the
 880    --    Ignore_Lines and Read_Lines parameters are ignored (i.e. the
 881    --    use of True for Read_XREF is equivalent to specifying an
 882    --    argument of "UWDX" for Read_Lines.
 883    --
 884    --    Ignore_Errors is normally False. If it is set True, then Scan_ALI
 885    --    will do its best to scan through a file and extract all information
 886    --    it can, even if there are errors. In this case Err is only set if
 887    --    Scan_ALI was completely unable to process the file (e.g. it did not
 888    --    look like an ALI file at all). Ignore_Errors is intended to improve
 889    --    the downward compatibility of new compilers with old tools.
 890
 891 end ALI;