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) 1992-2010, 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 3,  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 COPYING3.  If not, go to --
  19 -- http://www.gnu.org/licenses for a complete copy of the license.          --
  20 --                                                                          --
  21 -- GNAT was originally developed  by the GNAT team at  New York University. --
  22 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  23 --                                                                          --
  24 ------------------------------------------------------------------------------
  25
  26 --  This package defines the internal data structures used for representation
  27 --  of Ada Library Information (ALI) acquired from the ALI files generated
  28 --  by the front end.
  29
  30 with Casing;  use Casing;
  31 with Gnatvsn; use Gnatvsn;
  32 with Namet;   use Namet;
  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 ranges.
  46    --  The following type definitions show the ranges used for the subscripts
  47    --  (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    type Priority_Specific_Dispatching_Id is range 7_000_000 .. 7_999_999;
  71    --  Id values used for Priority_Specific_Dispatching table entries
  72
  73    --------------------
  74    -- ALI File Table --
  75    --------------------
  76
  77    --  Each ALI file read generates an entry in the ALIs table
  78
  79    No_ALI_Id : constant ALI_Id := ALI_Id'First;
  80    --  Special value indicating no ALI entry
  81
  82    First_ALI_Entry : constant ALI_Id := No_ALI_Id + 1;
  83    --  Id of first actual entry in table
  84
  85    type Main_Program_Type is (None, Proc, Func);
  86    --  Indicator of whether unit can be used as main program
  87
  88    type ALIs_Record is record
  89
  90       Afile : File_Name_Type;
  91       --  Name of ALI file
  92
  93       Ofile_Full_Name : File_Name_Type;
  94       --  Full name of object file corresponding to the ALI file
  95
  96       Sfile : File_Name_Type;
  97       --  Name of source file that generates this ALI file (which is equal
  98       --  to the name of the source file in the first unit table entry for
  99       --  this ALI file, since the body if present is always first).
 100
 101       Ver : String (1 .. Ver_Len_Max);
 102       --  Value of library version (V line in ALI file). Not set if
 103       --  V lines are ignored as a result of the Ignore_Lines parameter.
 104
 105       Ver_Len : Natural;
 106       --  Length of characters stored in Ver. Not set if V lines are ignored as
 107       --  a result of the Ignore_Lines parameter.
 108
 109       SAL_Interface : Boolean;
 110       --  Set True when this is an interface to a standalone library
 111
 112       First_Unit : Unit_Id;
 113       --  Id of first Unit table entry for this file
 114
 115       Last_Unit : Unit_Id;
 116       --  Id of last Unit table entry for this file
 117
 118       First_Sdep : Sdep_Id;
 119       --  Id of first Sdep table entry for this file
 120
 121       Last_Sdep : Sdep_Id;
 122       --  Id of last Sdep table entry for this file
 123
 124       Main_Program : Main_Program_Type;
 125       --  Indicator of whether first unit can be used as main program. Not set
 126       --  if 'M' appears in Ignore_Lines.
 127
 128       Main_Priority : Int;
 129       --  Indicates priority value if Main_Program field indicates that this
 130       --  can be a main program. A value of -1 (No_Main_Priority) indicates
 131       --  that no parameter was found, or no M line was present. Not set if
 132       --  'M' appears in Ignore_Lines.
 133
 134       Main_CPU : Int;
 135       --  Indicates processor if Main_Program field indicates that this can
 136       --  be a main program. A value of -1 (No_Main_CPU) indicates that no C
 137       --  parameter was found, or no M line was present. Not set if 'M' appears
 138       --  in Ignore_Lines.
 139
 140       Time_Slice_Value : Int;
 141       --  Indicates value of time slice parameter from T=xxx on main program
 142       --  line. A value of -1 indicates that no T=xxx parameter was found, or
 143       --  no M line was present. Not set if 'M' appears in Ignore_Lines.
 144
 145       Allocator_In_Body : Boolean;
 146       --  Set True if an AB switch appears on the main program line. False
 147       --  if no M line, or AB not present, or 'M appears in Ignore_Lines.
 148
 149       WC_Encoding : Character;
 150       --  Wide character encoding if main procedure. Otherwise not relevant.
 151       --  Not set if 'M' appears in Ignore_Lines.
 152
 153       Locking_Policy : Character;
 154       --  Indicates locking policy for units in this file. Space means tasking
 155       --  was not used, or that no Locking_Policy pragma was present or that
 156       --  this is a language defined unit. Otherwise set to first character
 157       --  (upper case) of policy name. Not set if 'P' appears in Ignore_Lines.
 158
 159       Queuing_Policy : Character;
 160       --  Indicates queuing policy for units in this file. Space means tasking
 161       --  was not used, or that no Queuing_Policy pragma was present or that
 162       --  this is a language defined unit. Otherwise set to first character
 163       --  (upper case) of policy name. Not set if 'P' appears in Ignore_Lines.
 164
 165       Task_Dispatching_Policy : Character;
 166       --  Indicates task dispatching policy for units in this file. Space means
 167       --  tasking was not used, or that no Task_Dispatching_Policy pragma was
 168       --  present or that this is a language defined unit. Otherwise set to
 169       --  first character (upper case) of policy name. Not set if 'P' appears
 170       --  in Ignore_Lines.
 171
 172       Compile_Errors : Boolean;
 173       --  Set to True if compile errors for unit. Note that No_Object will
 174       --  always be set as well in this case. Not set if 'P' appears in
 175       --  Ignore_Lines.
 176
 177       Float_Format : Character;
 178       --  Set to float format (set to I if no float-format given). Not set if
 179       --  'P' appears in Ignore_Lines.
 180
 181       No_Object : Boolean;
 182       --  Set to True if no object file generated. Not set if 'P' appears in
 183       --  Ignore_Lines.
 184
 185       Normalize_Scalars : Boolean;
 186       --  Set to True if file was compiled with Normalize_Scalars. Not set if
 187       --  'P' appears in Ignore_Lines.
 188
 189       Unit_Exception_Table : Boolean;
 190       --  Set to True if unit exception table pointer generated. Not set if 'P'
 191       --  appears in Ignore_Lines.
 192
 193       Zero_Cost_Exceptions : Boolean;
 194       --  Set to True if file was compiled with zero cost exceptions. Not set
 195       --  if 'P' appears in Ignore_Lines.
 196
 197       Restrictions : Restrictions_Info;
 198       --  Restrictions information reconstructed from R lines
 199
 200       First_Interrupt_State : Interrupt_State_Id;
 201       Last_Interrupt_State  : Interrupt_State_Id'Base;
 202       --  These point to the first and last entries in the interrupt state
 203       --  table for this unit. If no entries, then Last_Interrupt_State =
 204       --  First_Interrupt_State - 1 (that's why the 'Base reference is there,
 205       --  it can be one less than the lower bound of the subtype). Not set if
 206       --  'I' appears in Ignore_Lines
 207
 208       First_Specific_Dispatching : Priority_Specific_Dispatching_Id;
 209       Last_Specific_Dispatching  : Priority_Specific_Dispatching_Id'Base;
 210       --  These point to the first and last entries in the priority specific
 211       --  dispatching table for this unit. If there are no entries, then
 212       --  Last_Specific_Dispatching = First_Specific_Dispatching - 1. That
 213       --  is why the 'Base reference is there, it can be one less than the
 214       --  lower bound of the subtype. Not set if 'S' appears in Ignore_Lines.
 215
 216    end record;
 217
 218    No_Main_Priority : constant Int := -1;
 219    --  Code for no main priority set
 220
 221    No_Main_CPU : constant Int := -1;
 222    --  Code for no main cpu set
 223
 224    package ALIs is new Table.Table (
 225      Table_Component_Type => ALIs_Record,
 226      Table_Index_Type     => ALI_Id,
 227      Table_Low_Bound      => First_ALI_Entry,
 228      Table_Initial        => 500,
 229      Table_Increment      => 200,
 230      Table_Name           => "ALIs");
 231
 232    ----------------
 233    -- Unit Table --
 234    ----------------
 235
 236    --  Each unit within an ALI file generates an entry in the unit table
 237
 238    No_Unit_Id : constant Unit_Id := Unit_Id'First;
 239    --  Special value indicating no unit table entry
 240
 241    First_Unit_Entry : constant Unit_Id := No_Unit_Id + 1;
 242    --  Id of first actual entry in table
 243
 244    type Unit_Type is (Is_Spec, Is_Body, Is_Spec_Only, Is_Body_Only);
 245    --  Indicates type of entry, if both body and spec appear in the ALI file,
 246    --  then the first unit is marked Is_Body, and the second is marked Is_Spec.
 247    --  If only a spec appears, then it is marked as Is_Spec_Only, and if only
 248    --  a body appears, then it is marked Is_Body_Only).
 249
 250    subtype Version_String is String (1 .. 8);
 251    --  Version string, taken from unit record
 252
 253    type Unit_Record is record
 254
 255       My_ALI : ALI_Id;
 256       --  Corresponding ALI entry
 257
 258       Uname : Unit_Name_Type;
 259       --  Name of Unit
 260
 261       Sfile : File_Name_Type;
 262       --  Name of source file
 263
 264       Preelab : Boolean;
 265       --  Indicates presence of PR parameter for a preelaborated package
 266
 267       No_Elab : Boolean;
 268       --  Indicates presence of NE parameter for a unit that has does not
 269       --  have an elaboration routine (since it has no elaboration code).
 270
 271       Pure : Boolean;
 272       --  Indicates presence of PU parameter for a package having pragma Pure
 273
 274       Dynamic_Elab : Boolean;
 275       --  Set to True if the unit was compiled with dynamic elaboration checks
 276       --  (i.e. either -gnatE or pragma Elaboration_Checks (RM) was used to
 277       --  compile the unit).
 278
 279       Elaborate_Body : Boolean;
 280       --  Indicates presence of EB parameter for a package which has a pragma
 281       --  Elaborate_Body, and also for generic package instantiations.
 282
 283       Set_Elab_Entity : Boolean;
 284       --  Indicates presence of EE parameter for a unit which has an
 285       --  elaboration entity which must be set true as part of the
 286       --  elaboration of the entity.
 287
 288       Has_RACW : Boolean;
 289       --  Indicates presence of RA parameter for a package that declares at
 290       --  least one Remote Access to Class_Wide (RACW) object.
 291
 292       Remote_Types : Boolean;
 293       --  Indicates presence of RT parameter for a package which has a
 294       --  pragma Remote_Types.
 295
 296       Shared_Passive : Boolean;
 297       --  Indicates presence of SP parameter for a package which has a pragma
 298       --  Shared_Passive.
 299
 300       RCI : Boolean;
 301       --  Indicates presence of RC parameter for a package which has a pragma
 302       --  Remote_Call_Interface.
 303
 304       Predefined : Boolean;
 305       --  Indicates if unit is language predefined (or a child of such a unit)
 306
 307       Internal : Boolean;
 308       --  Indicates if unit is an internal unit (or a child of such a unit)
 309
 310       First_With : With_Id;
 311       --  Id of first withs table entry for this file
 312
 313       Last_With : With_Id;
 314       --  Id of last withs table entry for this file
 315
 316       First_Arg : Arg_Id;
 317       --  Id of first args table entry for this file
 318
 319       Last_Arg : Arg_Id;
 320       --  Id of last args table entry for this file
 321
 322       Utype : Unit_Type;
 323       --  Type of entry
 324
 325       Is_Generic : Boolean;
 326       --  True for generic unit (i.e. a generic declaration, or a generic
 327       --  body). False for a non-generic unit.
 328
 329       Unit_Kind : Character;
 330       --  Indicates the nature of the unit. 'p' for Packages and 's' for
 331       --  subprograms.
 332
 333       Version : Version_String;
 334       --  Version of unit
 335
 336       Icasing : Casing_Type;
 337       --  Indicates casing of identifiers in source file for this unit. This
 338       --  is used for informational output, and also for constructing the main
 339       --  unit if it is being built in Ada.
 340
 341       Kcasing : Casing_Type;
 342       --  Indicates casing of keywords in source file for this unit. This is
 343       --  used for informational output, and also for constructing the main
 344       --  unit if it is being built in Ada.
 345
 346       Elab_Position : aliased Natural;
 347       --  Initialized to zero. Set non-zero when a unit is chosen and
 348       --  placed in the elaboration order. The value represents the
 349       --  ordinal position in the elaboration order.
 350
 351       Init_Scalars : Boolean;
 352       --  Set True if IS qualifier appears in ALI file, indicating that
 353       --  an Initialize_Scalars pragma applies to the unit.
 354
 355       SAL_Interface : Boolean;
 356       --  Set True when this is an interface to a standalone library
 357
 358       Directly_Scanned : Boolean;
 359       --  True iff it is a unit from an ALI file specified to gnatbind
 360
 361       Body_Needed_For_SAL : Boolean;
 362       --  Indicates that the source for the body of the unit (subprogram,
 363       --  package, or generic unit) must be included in a standalone library.
 364
 365       Elaborate_Body_Desirable : Boolean;
 366       --  Indicates that the front end elaboration circuitry decided that it
 367       --  would be a good idea if this package had Elaborate_Body. The binder
 368       --  will attempt, but does not promise, to place the elaboration call
 369       --  for the body right after the call for the spec, or at least as close
 370       --  together as possible.
 371
 372       Optimize_Alignment : Character;
 373       --  Optimize_Alignment setting. Set to L/S/T/O for OL/OS/OT/OO present
 374
 375    end record;
 376
 377    package Units is new Table.Table (
 378      Table_Component_Type => Unit_Record,
 379      Table_Index_Type     => Unit_Id,
 380      Table_Low_Bound      => First_Unit_Entry,
 381      Table_Initial        => 100,
 382      Table_Increment      => 200,
 383      Table_Name           => "Unit");
 384
 385    ---------------------------
 386    -- Interrupt State Table --
 387    ---------------------------
 388
 389    --  An entry is made in this table for each I (interrupt state) line
 390    --  encountered in the input ALI file. The First/Last_Interrupt_Id
 391    --  fields of the ALI file entry show the range of entries defined
 392    --  within a particular ALI file.
 393
 394    type Interrupt_State_Record is record
 395       Interrupt_Id : Nat;
 396       --  Id from interrupt state entry
 397
 398       Interrupt_State : Character;
 399       --  State from interrupt state entry ('u'/'r'/'s')
 400
 401       IS_Pragma_Line : Nat;
 402       --  Line number of Interrupt_State pragma
 403    end record;
 404
 405    package Interrupt_States is new Table.Table (
 406      Table_Component_Type => Interrupt_State_Record,
 407      Table_Index_Type     => Interrupt_State_Id'Base,
 408      Table_Low_Bound      => Interrupt_State_Id'First,
 409      Table_Initial        => 100,
 410      Table_Increment      => 200,
 411      Table_Name           => "Interrupt_States");
 412
 413    -----------------------------------------
 414    -- Priority Specific Dispatching Table --
 415    -----------------------------------------
 416
 417    --  An entry is made in this table for each S (priority specific
 418    --  dispatching) line encountered in the input ALI file. The
 419    --  First/Last_Specific_Dispatching_Id fields of the ALI file
 420    --  entry show the range of entries defined within a particular
 421    --  ALI file.
 422
 423    type Specific_Dispatching_Record is record
 424       Dispatching_Policy : Character;
 425       --  First character (upper case) of the corresponding policy name
 426
 427       First_Priority     : Nat;
 428       --  Lower bound of the priority range to which the specified dispatching
 429       --  policy applies.
 430
 431       Last_Priority      : Nat;
 432       --  Upper bound of the priority range to which the specified dispatching
 433       --  policy applies.
 434
 435       PSD_Pragma_Line : Nat;
 436       --  Line number of Priority_Specific_Dispatching pragma
 437    end record;
 438
 439    package Specific_Dispatching is new Table.Table (
 440      Table_Component_Type => Specific_Dispatching_Record,
 441      Table_Index_Type     => Priority_Specific_Dispatching_Id'Base,
 442      Table_Low_Bound      => Priority_Specific_Dispatching_Id'First,
 443      Table_Initial        => 100,
 444      Table_Increment      => 200,
 445      Table_Name           => "Priority_Specific_Dispatching");
 446
 447    --------------
 448    -- Switches --
 449    --------------
 450
 451    --  These switches record status information about ali files that
 452    --  have been read, for quick reference without searching tables.
 453
 454    --  Note: a switch will be left set at its default value if the line
 455    --  which might otherwise set it is ignored (from Ignore_Lines).
 456
 457    Dynamic_Elaboration_Checks_Specified : Boolean := False;
 458    --  Set to False by Initialize_ALI. Set to True if Scan_ALI reads
 459    --  a unit for which dynamic elaboration checking is enabled.
 460
 461    Float_Format_Specified : Character := ' ';
 462    --  Set to blank by Initialize_ALI. Set to appropriate float format
 463    --  character (V or I, see Opt.Float_Format) if an ali file that
 464    --  is read contains an F line setting the floating point format.
 465
 466    Initialize_Scalars_Used : Boolean := False;
 467    --  Set True if an ali file contains the Initialize_Scalars flag
 468
 469    Locking_Policy_Specified : Character := ' ';
 470    --  Set to blank by Initialize_ALI. Set to the appropriate locking policy
 471    --  character if an ali file contains a P line setting the locking policy.
 472
 473    No_Normalize_Scalars_Specified : Boolean := False;
 474    --  Set to False by Initialize_ALI. Set to True if an ali file indicates
 475    --  that the file was compiled without normalize scalars.
 476
 477    No_Object_Specified : Boolean := False;
 478    --  Set to False by Initialize_ALI. Set to True if an ali file contains
 479    --  the No_Object flag.
 480
 481    Normalize_Scalars_Specified : Boolean := False;
 482    --  Set to False by Initialize_ALI. Set to True if an ali file indicates
 483    --  that the file was compiled in Normalize_Scalars mode.
 484
 485    Queuing_Policy_Specified : Character := ' ';
 486    --  Set to blank by Initialize_ALI. Set to the appropriate queuing policy
 487    --  character if an ali file contains a P line setting the queuing policy.
 488
 489    Cumulative_Restrictions : Restrictions_Info := No_Restrictions;
 490    --  This variable records the cumulative contributions of R lines in all
 491    --  ali files, showing whether a restriction pragma exists anywhere, and
 492    --  accumulating the aggregate knowledge of violations.
 493
 494    Stack_Check_Switch_Set : Boolean := False;
 495    --  Set to True if at least one ALI file contains '-fstack-check' in its
 496    --  argument list.
 497
 498    Static_Elaboration_Model_Used : Boolean := False;
 499    --  Set to False by Initialize_ALI. Set to True if any ALI file for a
 500    --  non-internal unit compiled with the static elaboration model is
 501    --  encountered.
 502
 503    Task_Dispatching_Policy_Specified : Character := ' ';
 504    --  Set to blank by Initialize_ALI. Set to the appropriate task dispatching
 505    --  policy character if an ali file contains a P line setting the
 506    --  task dispatching policy.
 507
 508    Unreserve_All_Interrupts_Specified : Boolean := False;
 509    --  Set to False by Initialize_ALI. Set to True if an ali file is read that
 510    --  has  P line specifying unreserve all interrupts mode.
 511
 512    Zero_Cost_Exceptions_Specified : Boolean := False;
 513    --  Set to False by Initialize_ALI. Set to True if an ali file is read that
 514    --  has a P line specifying the generation of zero cost exceptions.
 515
 516    -----------------
 517    -- Withs Table --
 518    -----------------
 519
 520    --  Each With line (W line) in an ALI file generates a Withs table entry
 521
 522    --  Note: there will be no entries in this table if 'W' lines are ignored
 523
 524    No_With_Id : constant With_Id := With_Id'First;
 525    --  Special value indicating no withs table entry
 526
 527    First_With_Entry : constant With_Id := No_With_Id + 1;
 528    --  Id of first actual entry in table
 529
 530    type With_Record is record
 531
 532       Uname : Unit_Name_Type;
 533       --  Name of Unit
 534
 535       Sfile : File_Name_Type;
 536       --  Name of source file, set to No_File in generic case
 537
 538       Afile : File_Name_Type;
 539       --  Name of ALI file, set to No_File in generic case
 540
 541       Elaborate : Boolean;
 542       --  Indicates presence of E parameter
 543
 544       Elaborate_All : Boolean;
 545       --  Indicates presence of EA parameter
 546
 547       Elab_All_Desirable : Boolean;
 548       --  Indicates presence of AD parameter
 549
 550       Elab_Desirable     : Boolean;
 551       --  Indicates presence of ED parameter
 552
 553       SAL_Interface : Boolean := False;
 554       --  True if the Unit is an Interface of a Stand-Alone Library
 555
 556       Limited_With : Boolean := False;
 557       --  True if unit is named in a limited_with_clause
 558    end record;
 559
 560    package Withs is new Table.Table (
 561      Table_Component_Type => With_Record,
 562      Table_Index_Type     => With_Id,
 563      Table_Low_Bound      => First_With_Entry,
 564      Table_Initial        => 5000,
 565      Table_Increment      => 200,
 566      Table_Name           => "Withs");
 567
 568    ---------------------
 569    -- Arguments Table --
 570    ---------------------
 571
 572    --  Each Arg line (A line) in an ALI file generates an Args table entry
 573
 574    --  Note: there will be no entries in this table if 'A' lines are ignored
 575
 576    No_Arg_Id : constant Arg_Id := Arg_Id'First;
 577    --  Special value indicating no args table entry
 578
 579    First_Arg_Entry : constant Arg_Id := No_Arg_Id + 1;
 580    --  Id of first actual entry in table
 581
 582    package Args is new Table.Table (
 583      Table_Component_Type => String_Ptr,
 584      Table_Index_Type     => Arg_Id,
 585      Table_Low_Bound      => First_Arg_Entry,
 586      Table_Initial        => 1000,
 587      Table_Increment      => 100,
 588      Table_Name           => "Args");
 589
 590    --------------------------
 591    -- Linker_Options Table --
 592    --------------------------
 593
 594    --  If an ALI file has one of more Linker_Options lines, then a single
 595    --  entry is made in this table. If more than one Linker_Options lines
 596    --  appears in a given ALI file, then the arguments are concatenated
 597    --  to form the entry in this table, using a NUL character as the
 598    --  separator, and a final NUL character is appended to the end.
 599
 600    --  Note: there will be no entries in this table if 'L' lines are ignored
 601
 602    type Linker_Option_Record is record
 603       Name : Name_Id;
 604       --  Name entry containing concatenated list of Linker_Options
 605       --  arguments separated by NUL and ended by NUL as described above.
 606
 607       Unit : Unit_Id;
 608       --  Unit_Id for the entry
 609
 610       Internal_File : Boolean;
 611       --  Set True if the linker options are from an internal file. This is
 612       --  used to insert certain standard entries after all the user entries
 613       --  but before the entries from the run-time.
 614
 615       Original_Pos : Positive;
 616       --  Keep track of original position in the linker options table. This
 617       --  is used to implement a stable sort when we sort the linker options
 618       --  table.
 619    end record;
 620
 621    --  The indexes of active entries in this table range from 1 to the
 622    --  value of Linker_Options.Last. The zero'th element is for sort call.
 623
 624    package Linker_Options is new Table.Table (
 625      Table_Component_Type => Linker_Option_Record,
 626      Table_Index_Type     => Integer,
 627      Table_Low_Bound      => 0,
 628      Table_Initial        => 200,
 629      Table_Increment      => 400,
 630      Table_Name           => "Linker_Options");
 631
 632    -----------------
 633    -- Notes Table --
 634    -----------------
 635
 636    --  The notes table records entries from N lines
 637
 638    type Notes_Record is record
 639       Pragma_Type : Character;
 640       --  'A', 'C', 'I', 'S', 'T' for Annotate/Comment/Ident/Subtitle/Title
 641
 642       Pragma_Line : Nat;
 643       --  Line number of pragma
 644
 645       Pragma_Col : Nat;
 646       --  Column number of pragma
 647
 648       Unit : Unit_Id;
 649       --  Unit_Id for the entry
 650
 651       Pragma_Args : Name_Id;
 652       --  Pragma arguments. No_Name if no arguments, otherwise a single
 653       --  name table entry consisting of all the characters on the notes
 654       --  line from the first non-blank character following the source
 655       --  location to the last character on the line.
 656    end record;
 657
 658    --  The indexes of active entries in this table range from 1 to the
 659    --  value of Linker_Options.Last. The zero'th element is for convenience
 660    --  if the table needs to be sorted.
 661
 662    package Notes is new Table.Table (
 663      Table_Component_Type => Notes_Record,
 664      Table_Index_Type     => Integer,
 665      Table_Low_Bound      => 0,
 666      Table_Initial        => 200,
 667      Table_Increment      => 400,
 668      Table_Name           => "Notes");
 669
 670    -------------------------------------------
 671    -- External Version Reference Hash Table --
 672    -------------------------------------------
 673
 674    --  This hash table keeps track of external version reference strings
 675    --  as read from E lines in the ali file. The stored values do not
 676    --  include the terminating quote characters.
 677
 678    --  Note: there will be no entries in this table if 'E' lines are ignored
 679
 680    type Vindex is range 0 .. 98;
 681    --  Type to define range of headers
 682
 683    function SHash (S : String_Ptr) return Vindex;
 684    --  Hash function for this table
 685
 686    function SEq (F1, F2 : String_Ptr) return Boolean;
 687    --  Equality function for this table
 688
 689    package Version_Ref is new Simple_HTable (
 690      Header_Num => Vindex,
 691      Element    => Boolean,
 692      No_Element => False,
 693      Key        => String_Ptr,
 694      Hash       => SHash,
 695      Equal      => SEq);
 696
 697    -------------------------
 698    -- No_Dependency Table --
 699    -------------------------
 700
 701    --  Each R line for a No_Dependency Restriction generates an entry in
 702    --  this No_Dependency table.
 703
 704    type No_Dep_Record is record
 705       ALI_File : ALI_Id;
 706       --  ALI File containing the entry
 707
 708       No_Dep_Unit : Name_Id;
 709       --  Id for names table entry including entire name, including periods
 710    end record;
 711
 712    package No_Deps is new Table.Table (
 713      Table_Component_Type => No_Dep_Record,
 714      Table_Index_Type     => Integer,
 715      Table_Low_Bound      => 0,
 716      Table_Initial        => 200,
 717      Table_Increment      => 400,
 718      Table_Name           => "No_Deps");
 719
 720    ------------------------------------
 721    -- Sdep (Source Dependency) Table --
 722    ------------------------------------
 723
 724    --  Each source dependency (D line) in an ALI file generates an entry in the
 725    --  Sdep table.
 726
 727    --  Note: there will be no entries in this table if 'D' lines are ignored
 728
 729    No_Sdep_Id : constant Sdep_Id := Sdep_Id'First;
 730    --  Special value indicating no Sdep table entry
 731
 732    First_Sdep_Entry : Sdep_Id := No_Sdep_Id + 1;
 733    --  Id of first Sdep entry for current ali file. This is initialized to the
 734    --  first Sdep entry in the table, and then incremented appropriately as
 735    --  successive ALI files are scanned.
 736
 737    type Sdep_Record is record
 738
 739       Sfile : File_Name_Type;
 740       --  Name of source file
 741
 742       Stamp : Time_Stamp_Type;
 743       --  Time stamp value. Note that this will be all zero characters for the
 744       --  dummy entries for missing or non-dependent files.
 745
 746       Checksum : Word;
 747       --  Checksum value. Note that this will be all zero characters for the
 748       --  dummy entries for missing or non-dependent files
 749
 750       Dummy_Entry : Boolean;
 751       --  Set True for dummy entries that correspond to missing files or files
 752       --  where no dependency relationship exists.
 753
 754       Subunit_Name : Name_Id;
 755       --  Name_Id for subunit name if present, else No_Name
 756
 757       Rfile : File_Name_Type;
 758       --  Reference file name. Same as Sfile unless a Source_Reference pragma
 759       --  was used, in which case it reflects the name used in the pragma.
 760
 761       Start_Line : Nat;
 762       --  Starting line number in file. Always 1, unless a Source_Reference
 763       --  pragma was used, in which case it reflects the line number value
 764       --  given in the pragma.
 765
 766    end record;
 767
 768    package Sdep is new Table.Table (
 769      Table_Component_Type => Sdep_Record,
 770      Table_Index_Type     => Sdep_Id,
 771      Table_Low_Bound      => First_Sdep_Entry,
 772      Table_Initial        => 5000,
 773      Table_Increment      => 200,
 774      Table_Name           => "Sdep");
 775
 776    ----------------------------
 777    -- Use of Name Table Info --
 778    ----------------------------
 779
 780    --  All unit names and file names are entered into the Names table. The Info
 781    --  fields of these entries are used as follows:
 782
 783    --    Unit name           Info field has Unit_Id of unit table entry
 784    --    ALI file name       Info field has ALI_Id of ALI table entry
 785    --    Source file name    Info field has Source_Id of source table entry
 786
 787    --------------------------
 788    -- Cross-Reference Data --
 789    --------------------------
 790
 791    --  The following table records cross-reference sections, there is one entry
 792    --  for each X header line in the ALI file for an xref section.
 793
 794    --  Note: there will be no entries in this table if 'X' lines are ignored
 795
 796    type Xref_Section_Record is record
 797       File_Num : Sdep_Id;
 798       --  Dependency number for file (entry in Sdep.Table)
 799
 800       File_Name : File_Name_Type;
 801       --  Name of file
 802
 803       First_Entity : Nat;
 804       --  First entry in Xref_Entity table
 805
 806       Last_Entity : Nat;
 807       --  Last entry in Xref_Entity table
 808    end record;
 809
 810    package Xref_Section is new Table.Table (
 811      Table_Component_Type => Xref_Section_Record,
 812      Table_Index_Type     => Nat,
 813      Table_Low_Bound      => 1,
 814      Table_Initial        => 50,
 815      Table_Increment      => 300,
 816      Table_Name           => "Xref_Section");
 817
 818    --  The following is used to indicate whether a typeref field is present
 819    --  for the entity, and if so what kind of typeref field.
 820
 821    type Tref_Kind is (
 822      Tref_None,    --  No typeref present
 823      Tref_Access,  --  Access type typeref (points to designated type)
 824      Tref_Derived, --  Derived type typeref (points to parent type)
 825      Tref_Type);   --  All other cases
 826
 827    type Visibility_Kind is
 828      (Global, --  Library level entity
 829       Static, --  Static C/C++ entity
 830       Other); --  Local and other entity
 831
 832    --  The following table records entities for which xrefs are recorded
 833
 834    type Xref_Entity_Record is record
 835       Line : Pos;
 836       --  Line number of definition
 837
 838       Etype : Character;
 839       --  Set to the identification character for the entity. See section
 840       --  "Cross-Reference Entity Identifiers" in lib-xref.ads for details.
 841
 842       Col : Pos;
 843       --  Column number of definition
 844
 845       Visibility : Visibility_Kind;
 846       --  Visiblity of entity
 847
 848       Entity : Name_Id;
 849       --  Name of entity
 850
 851       Iref_File_Num : Sdep_Id;
 852       --  This field is set to the dependency reference for the file containing
 853       --  the generic entity that this one instantiates, or to No_Sdep_Id if
 854       --  the current entity is not an instantiation
 855
 856       Iref_Line : Nat;
 857       --  This field is set to the line number in Iref_File_Num of the generic
 858       --  entity that this one instantiates, or to zero if the current entity
 859       --  is not an instantiation.
 860
 861       Rref_Line : Nat;
 862       --  This field is set to the line number of a renaming reference if
 863       --  one is present, or to zero if no renaming reference is present
 864
 865       Rref_Col : Nat;
 866       --  This field is set to the column number of a renaming reference
 867       --  if one is present, or to zero if no renaming reference is present.
 868
 869       Tref : Tref_Kind;
 870       --  Indicates if a typeref is present, and if so what kind. Set to
 871       --  Tref_None if no typeref field is present.
 872
 873       Tref_File_Num : Sdep_Id;
 874       --  This field is set to No_Sdep_Id if no typeref is present, or
 875       --  if the typeref refers to an entity in standard. Otherwise it
 876       --  it is the dependency reference for the file containing the
 877       --  declaration of the typeref entity.
 878
 879       Tref_Line : Nat;
 880       --  This field is set to zero if no typeref is present, or if the
 881       --  typeref refers to an entity in standard. Otherwise it contains
 882       --  the line number of the declaration of the typeref entity.
 883
 884       Tref_Type : Character;
 885       --  This field is set to blank if no typeref is present, or if the
 886       --  typeref refers to an entity in standard. Otherwise it contains
 887       --  the identification character for the typeref entity. See section
 888       --  "Cross-Reference Entity Identifiers" in lib-xref.ads for details.
 889
 890       Tref_Col : Nat;
 891       --  This field is set to zero if no typeref is present, or if the
 892       --  typeref refers to an entity in standard. Otherwise it contains
 893       --  the column number of the declaration of the parent type.
 894
 895       Tref_Standard_Entity : Name_Id;
 896       --  This field is set to No_Name if no typeref is present or if the
 897       --  typeref refers to a declared entity rather than an entity in
 898       --  package Standard. If there is a typeref that references an
 899       --  entity in package Standard, then this field is a Name_Id
 900       --  reference for the entity name.
 901
 902       Oref_File_Num : Sdep_Id;
 903       --  This field is set to No_Sdep_Id if the entity doesn't override any
 904       --  other entity, or to the dependency reference for the overridden
 905       --  entity.
 906
 907       Oref_Line : Nat;
 908       Oref_Col  : Nat;
 909       --  These two fields are set to the line and column of the overridden
 910       --  entity.
 911
 912       First_Xref : Nat;
 913       --  Index into Xref table of first cross-reference
 914
 915       Last_Xref : Nat;
 916       --  Index into Xref table of last cross-reference. The value in
 917       --  Last_Xref can be less than the First_Xref value to indicate
 918       --  that no entries are present in the Xref Table.
 919    end record;
 920
 921    package Xref_Entity is new Table.Table (
 922      Table_Component_Type => Xref_Entity_Record,
 923      Table_Index_Type     => Nat,
 924      Table_Low_Bound      => 1,
 925      Table_Initial        => 500,
 926      Table_Increment      => 300,
 927      Table_Name           => "Xref_Entity");
 928
 929    Array_Index_Reference : constant Character := '*';
 930    Interface_Reference   : constant Character := 'I';
 931    --  Some special types of references. In the ALI file itself, these
 932    --  are output as attributes of the entity, not as references, but
 933    --  there is no provision in Xref_Entity_Record for storing multiple
 934    --  such references.
 935
 936    --  The following table records actual cross-references
 937
 938    type Xref_Record is record
 939       File_Num : Sdep_Id;
 940       --  Set to the file dependency number for the cross-reference. Note
 941       --  that if no file entry is present explicitly, this is just a copy
 942       --  of the reference for the current cross-reference section.
 943
 944       Line : Nat;
 945       --  Line number for the reference. This is zero when referencing a
 946       --  predefined entity, but in this case Name is set.
 947
 948       Rtype : Character;
 949       --  Indicates type of reference, using code used in ALI file:
 950       --    r = reference
 951       --    m = modification
 952       --    b = body entity
 953       --    c = completion of private or incomplete type
 954       --    x = type extension
 955       --    i = implicit reference
 956       --    Array_Index_Reference = reference to the index of an array
 957       --    Interface_Reference   = reference to an interface implemented
 958       --                            by the type
 959       --  See description in lib-xref.ads for further details
 960
 961       Col : Nat;
 962       --  Column number for the reference
 963
 964       Name : Name_Id := No_Name;
 965       --  This is only used when referencing a predefined entity. Currently,
 966       --  this only occurs for array indexes.
 967
 968       --  Note: for instantiation references, Rtype is set to ' ', and Col is
 969       --  set to zero. One or more such entries can follow any other reference.
 970       --  When there is more than one such entry, this is to be read as:
 971       --     e.g. ref1  ref2  ref3
 972       --     ref1 is a reference to an entity that was instantied at ref2.
 973       --     ref2 itself is also the result of an instantiation, that took
 974       --     place at ref3
 975    end record;
 976
 977    package Xref is new Table.Table (
 978      Table_Component_Type => Xref_Record,
 979      Table_Index_Type     => Nat,
 980      Table_Low_Bound      => 1,
 981      Table_Initial        => 2000,
 982      Table_Increment      => 300,
 983      Table_Name           => "Xref");
 984
 985    --------------------------------------
 986    -- Subprograms for Reading ALI File --
 987    --------------------------------------
 988
 989    procedure Initialize_ALI;
 990    --  Initialize the ALI tables. Also resets all switch values to defaults
 991
 992    function Scan_ALI
 993      (F                : File_Name_Type;
 994       T                : Text_Buffer_Ptr;
 995       Ignore_ED        : Boolean;
 996       Err              : Boolean;
 997       Read_Xref        : Boolean := False;
 998       Read_Lines       : String  := "";
 999       Ignore_Lines     : String  := "X";
1000       Ignore_Errors    : Boolean := False;
1001       Directly_Scanned : Boolean := False) return ALI_Id;
1002    --  Given the text, T, of an ALI file, F, scan and store the information
1003    --  from the file, and return the Id of the resulting entry in the ALI
1004    --  table. Switch settings may be modified as described above in the
1005    --  switch description settings.
1006    --
1007    --    Ignore_ED is normally False. If set to True, it indicates that
1008    --    all AD/ED (elaboration desirable) indications in the ALI file are
1009    --    to be ignored. This parameter is obsolete now that the -f switch
1010    --    is removed from gnatbind, and should be removed ???
1011    --
1012    --    Err determines the action taken on an incorrectly formatted file.
1013    --    If Err is False, then an error message is output, and the program
1014    --    is terminated. If Err is True, then no error message is output,
1015    --    and No_ALI_Id is returned.
1016    --
1017    --    Ignore_Lines requests that Scan_ALI ignore any lines that start
1018    --    with any given key character. The default value of X causes all
1019    --    Xref lines to be ignored. The corresponding data in the ALI
1020    --    tables will not be filled in this case. It is not possible
1021    --    to ignore U (unit) lines, they are always read.
1022    --
1023    --    Read_Lines requests that Scan_ALI process only lines that start
1024    --    with one of the given characters. The corresponding data in the
1025    --    ALI file for any characters not given in the list will not be
1026    --    set. The default value of the null string indicates that all
1027    --    lines should be read (unless Ignore_Lines is specified). U
1028    --    (unit) lines are always read regardless of the value of this
1029    --    parameter.
1030    --
1031    --    Note: either Ignore_Lines or Read_Lines should be non-null, but not
1032    --    both. If both are provided then only the Read_Lines value is used,
1033    --    and the Ignore_Lines parameter is ignored.
1034    --
1035    --    Read_XREF is set True to read and acquire the cross-reference
1036    --    information. If Read_XREF is set to True, then the effect is to ignore
1037    --    all lines other than U, W, D and X lines and the Ignore_Lines and
1038    --    Read_Lines parameters are ignored (i.e. the use of True for Read_XREF
1039    --    is equivalent to specifying an argument of "UWDX" for Read_Lines.
1040    --
1041    --    Ignore_Errors is normally False. If it is set True, then Scan_ALI
1042    --    will do its best to scan through a file and extract all information
1043    --    it can, even if there are errors. In this case Err is only set if
1044    --    Scan_ALI was completely unable to process the file (e.g. it did not
1045    --    look like an ALI file at all). Ignore_Errors is intended to improve
1046    --    the downward compatibility of new compilers with old tools.
1047    --
1048    --    Directly_Scanned is normally False. If it is set to True, then the
1049    --    units (spec and/or body) corresponding to the ALI file are marked as
1050    --    such. It is used to decide for what units gnatbind should generate
1051    --    the symbols corresponding to 'Version or 'Body_Version in
1052    --    Stand-Alone Libraries.
1053
1054 end ALI;