gcc/ada/ali.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                                  A L I                                   --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2004 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 with Butil;  use Butil;
  28 with Debug;  use Debug;
  29 with Fname;  use Fname;
  30 with Namet;  use Namet;
  31 with Opt;    use Opt;
  32 with Osint;  use Osint;
  33 with Output; use Output;
  34
  35 package body ALI is
  36
  37    use ASCII;
  38    --  Make control characters visible
  39
  40    --  The following variable records which characters currently are
  41    --  used as line type markers in the ALI file. This is used in
  42    --  Scan_ALI to detect (or skip) invalid lines.
  43
  44    Known_ALI_Lines : constant array (Character range 'A' .. 'Z') of Boolean :=
  45      ('V'    => True,   -- version
  46       'M'    => True,   -- main program
  47       'A'    => True,   -- argument
  48       'P'    => True,   -- program
  49       'R'    => True,   -- restriction
  50       'I'    => True,   -- interrupt
  51       'U'    => True,   -- unit
  52       'W'    => True,   -- with
  53       'L'    => True,   -- linker option
  54       'E'    => True,   -- external
  55       'D'    => True,   -- dependency
  56       'X'    => True,   -- xref
  57       others => False);
  58
  59    --------------------
  60    -- Initialize_ALI --
  61    --------------------
  62
  63    procedure Initialize_ALI is
  64    begin
  65       --  When (re)initializing ALI data structures the ALI user expects to
  66       --  get a fresh set of data structures. Thus we first need to erase the
  67       --  marks put in the name table by the previous set of ALI routine calls.
  68       --  These two loops are empty and harmless the first time in.
  69
  70       for J in ALIs.First .. ALIs.Last loop
  71          Set_Name_Table_Info (ALIs.Table (J).Afile, 0);
  72       end loop;
  73
  74       for J in Units.First .. Units.Last loop
  75          Set_Name_Table_Info (Units.Table (J).Uname, 0);
  76       end loop;
  77
  78       --  Free argument table strings
  79
  80       for J in Args.First .. Args.Last loop
  81          Free (Args.Table (J));
  82       end loop;
  83
  84       --  Initialize all tables
  85
  86       ALIs.Init;
  87       Units.Init;
  88       Withs.Init;
  89       Sdep.Init;
  90       Linker_Options.Init;
  91       Xref_Section.Init;
  92       Xref_Entity.Init;
  93       Xref.Init;
  94       Version_Ref.Reset;
  95
  96       --  Add dummy zero'th item in Linker_Options for the sort function
  97
  98       Linker_Options.Increment_Last;
  99
 100       --  Initialize global variables recording cumulative options in all
 101       --  ALI files that are read for a given processing run in gnatbind.
 102
 103       Dynamic_Elaboration_Checks_Specified := False;
 104       Float_Format_Specified               := ' ';
 105       Locking_Policy_Specified             := ' ';
 106       No_Normalize_Scalars_Specified       := False;
 107       No_Object_Specified                  := False;
 108       Normalize_Scalars_Specified          := False;
 109       Queuing_Policy_Specified             := ' ';
 110       Static_Elaboration_Model_Used        := False;
 111       Task_Dispatching_Policy_Specified    := ' ';
 112       Unreserve_All_Interrupts_Specified   := False;
 113       Zero_Cost_Exceptions_Specified       := False;
 114    end Initialize_ALI;
 115
 116    --------------
 117    -- Scan_ALI --
 118    --------------
 119
 120    function Scan_ALI
 121      (F             : File_Name_Type;
 122       T             : Text_Buffer_Ptr;
 123       Ignore_ED     : Boolean;
 124       Err           : Boolean;
 125       Read_Xref     : Boolean := False;
 126       Read_Lines    : String  := "";
 127       Ignore_Lines  : String  := "X";
 128       Ignore_Errors : Boolean := False) return ALI_Id
 129    is
 130       P         : Text_Ptr := T'First;
 131       Line      : Logical_Line_Number := 1;
 132       Id        : ALI_Id;
 133       C         : Character;
 134       NS_Found  : Boolean;
 135       First_Arg : Arg_Id;
 136
 137       Ignore : array (Character range 'A' .. 'Z') of Boolean;
 138       --  Ignore (X) is set to True if lines starting with X are to
 139       --  be ignored by Scan_ALI and skipped, and False if the lines
 140       --  are to be read and processed.
 141
 142       Restrictions_Initial : Rident.Restrictions_Info;
 143       pragma Warnings (Off, Restrictions_Initial);
 144       --  This variable, which should really be a constant (but that's not
 145       --  allowed by the language) is used only for initialization, and the
 146       --  reason we are declaring it is to get the default initialization
 147       --  set for the object.
 148
 149       Bad_ALI_Format : exception;
 150       --  Exception raised by Fatal_Error if Err is True
 151
 152       function At_Eol return Boolean;
 153       --  Test if at end of line
 154
 155       function At_End_Of_Field return Boolean;
 156       --  Test if at end of line, or if at blank or horizontal tab
 157
 158       procedure Check_At_End_Of_Field;
 159       --  Check if we are at end of field, fatal error if not
 160
 161       procedure Checkc (C : Character);
 162       --  Check next character is C. If so bump past it, if not fatal error
 163
 164       procedure Check_Unknown_Line;
 165       --  If Ignore_Errors mode, then checks C to make sure that it is not
 166       --  an unknown ALI line type characters, and if so, skips lines
 167       --  until the first character of the line is one of these characters,
 168       --  at which point it does a Getc to put that character in C. The
 169       --  call has no effect if C is already an appropriate character.
 170       --  If not in Ignore_Errors mode, a fatal error is signalled if the
 171       --  line is unknown. Note that if C is an EOL on entry, the line is
 172       --  skipped (it is assumed that blank lines are never significant).
 173       --  If C is EOF on entry, the call has no effect (it is assumed that
 174       --  the caller will properly handle this case).
 175
 176       procedure Fatal_Error;
 177       --  Generate fatal error message for badly formatted ALI file if
 178       --  Err is false, or raise Bad_ALI_Format if Err is True.
 179
 180       procedure Fatal_Error_Ignore;
 181       pragma Inline (Fatal_Error_Ignore);
 182       --  In Ignore_Errors mode, has no effect, otherwise same as Fatal_Error
 183
 184       function Getc return Character;
 185       --  Get next character, bumping P past the character obtained
 186
 187       function Get_Name
 188         (Lower         : Boolean := False;
 189          Ignore_Spaces : Boolean := False) return Name_Id;
 190       --  Skip blanks, then scan out a name (name is left in Name_Buffer with
 191       --  length in Name_Len, as well as being returned in Name_Id form).
 192       --  If Lower is set to True then the Name_Buffer will be converted to
 193       --  all lower case, for systems where file names are not case sensitive.
 194       --  This ensures that gnatbind works correctly regardless of the case
 195       --  of the file name on all systems. The name is terminated by a either
 196       --  white space (when Ignore_Spaces is False) or a typeref bracket or
 197       --  an equal sign except for the special case of an operator name
 198       --  starting with a double quite which is terminated by another double
 199       --  quote.
 200
 201       function Get_Nat return Nat;
 202       --  Skip blanks, then scan out an unsigned integer value in Nat range.
 203
 204       function Get_Stamp return Time_Stamp_Type;
 205       --  Skip blanks, then scan out a time stamp
 206
 207       function Nextc return Character;
 208       --  Return current character without modifying pointer P
 209
 210       procedure Skip_Eol;
 211       --  Skip past spaces, then skip past end of line (fatal error if not
 212       --  at end of line). Also skips past any following blank lines.
 213
 214       procedure Skip_Line;
 215       --  Skip rest of current line and any following blank lines.
 216
 217       procedure Skip_Space;
 218       --  Skip past white space (blanks or horizontal tab)
 219
 220       procedure Skipc;
 221       --  Skip past next character, does not affect value in C. This call
 222       --  is like calling Getc and ignoring the returned result.
 223
 224       ---------------------
 225       -- At_End_Of_Field --
 226       ---------------------
 227
 228       function At_End_Of_Field return Boolean is
 229       begin
 230          return Nextc <= ' ';
 231       end At_End_Of_Field;
 232
 233       ------------
 234       -- At_Eol --
 235       ------------
 236
 237       function At_Eol return Boolean is
 238       begin
 239          return Nextc = EOF or else Nextc = CR or else Nextc = LF;
 240       end At_Eol;
 241
 242       ---------------------------
 243       -- Check_At_End_Of_Field --
 244       ---------------------------
 245
 246       procedure Check_At_End_Of_Field is
 247       begin
 248          if not At_End_Of_Field then
 249             if Ignore_Errors then
 250                while Nextc > ' ' loop
 251                   P := P + 1;
 252                end loop;
 253             else
 254                Fatal_Error;
 255             end if;
 256          end if;
 257       end Check_At_End_Of_Field;
 258
 259       ------------
 260       -- Checkc --
 261       ------------
 262
 263       procedure Checkc (C : Character) is
 264       begin
 265          if Nextc = C then
 266             P := P + 1;
 267          elsif Ignore_Errors then
 268             P := P + 1;
 269          else
 270             Fatal_Error;
 271          end if;
 272       end Checkc;
 273
 274       ------------------------
 275       -- Check_Unknown_Line --
 276       ------------------------
 277
 278       procedure Check_Unknown_Line is
 279       begin
 280          while C not in 'A' .. 'Z'
 281            or else not Known_ALI_Lines (C)
 282          loop
 283             if C = CR or else C = LF then
 284                Skip_Line;
 285
 286             elsif C = EOF then
 287                return;
 288
 289             elsif Ignore_Errors then
 290                Skip_Line;
 291                C := Getc;
 292
 293             else
 294                Fatal_Error;
 295             end if;
 296          end loop;
 297       end Check_Unknown_Line;
 298
 299       -----------------
 300       -- Fatal_Error --
 301       -----------------
 302
 303       procedure Fatal_Error is
 304          Ptr1 : Text_Ptr;
 305          Ptr2 : Text_Ptr;
 306          Col  : Int;
 307
 308          procedure Wchar (C : Character);
 309          --  Write a single character, replacing horizontal tab by spaces
 310
 311          procedure Wchar (C : Character) is
 312          begin
 313             if C = HT then
 314                loop
 315                   Wchar (' ');
 316                   exit when Col mod 8 = 0;
 317                end loop;
 318
 319             else
 320                Write_Char (C);
 321                Col := Col + 1;
 322             end if;
 323          end Wchar;
 324
 325       --  Start of processing for Fatal_Error
 326
 327       begin
 328          if Err then
 329             raise Bad_ALI_Format;
 330          end if;
 331
 332          Set_Standard_Error;
 333          Write_Str ("fatal error: file ");
 334          Write_Name (F);
 335          Write_Str (" is incorrectly formatted");
 336          Write_Eol;
 337          Write_Str
 338            ("make sure you are using consistent versions of gcc/gnatbind");
 339          Write_Eol;
 340
 341          --  Find start of line
 342
 343          Ptr1 := P;
 344
 345          while Ptr1 > T'First
 346            and then T (Ptr1 - 1) /= CR
 347            and then T (Ptr1 - 1) /= LF
 348          loop
 349             Ptr1 := Ptr1 - 1;
 350          end loop;
 351
 352          Write_Int (Int (Line));
 353          Write_Str (". ");
 354
 355          if Line < 100 then
 356             Write_Char (' ');
 357          end if;
 358
 359          if Line < 10 then
 360             Write_Char (' ');
 361          end if;
 362
 363          Col := 0;
 364          Ptr2 := Ptr1;
 365
 366          while Ptr2 < T'Last
 367            and then T (Ptr2) /= CR
 368            and then T (Ptr2) /= LF
 369          loop
 370             Wchar (T (Ptr2));
 371             Ptr2 := Ptr2 + 1;
 372          end loop;
 373
 374          Write_Eol;
 375
 376          Write_Str ("     ");
 377          Col := 0;
 378
 379          while Ptr1 < P loop
 380             if T (Ptr1) = HT then
 381                Wchar (HT);
 382             else
 383                Wchar (' ');
 384             end if;
 385
 386             Ptr1 := Ptr1 + 1;
 387          end loop;
 388
 389          Wchar ('|');
 390          Write_Eol;
 391
 392          Exit_Program (E_Fatal);
 393       end Fatal_Error;
 394
 395       ------------------------
 396       -- Fatal_Error_Ignore --
 397       ------------------------
 398
 399       procedure Fatal_Error_Ignore is
 400       begin
 401          if not Ignore_Errors then
 402             Fatal_Error;
 403          end if;
 404       end Fatal_Error_Ignore;
 405
 406       --------------
 407       -- Get_Name --
 408       --------------
 409
 410       function Get_Name
 411         (Lower         : Boolean := False;
 412          Ignore_Spaces : Boolean := False) return Name_Id
 413       is
 414       begin
 415          Name_Len := 0;
 416          Skip_Space;
 417
 418          if At_Eol then
 419             if Ignore_Errors then
 420                return Error_Name;
 421             else
 422                Fatal_Error;
 423             end if;
 424          end if;
 425
 426          loop
 427             Name_Len := Name_Len + 1;
 428             Name_Buffer (Name_Len) := Getc;
 429
 430             exit when At_End_Of_Field and not Ignore_Spaces;
 431
 432             if Name_Buffer (1) = '"' then
 433                exit when Name_Len > 1 and then Name_Buffer (Name_Len) = '"';
 434
 435             else
 436                exit when (At_End_Of_Field and not Ignore_Spaces)
 437                  or else Nextc = '(' or else Nextc = ')'
 438                  or else Nextc = '{' or else Nextc = '}'
 439                  or else Nextc = '<' or else Nextc = '>'
 440                  or else Nextc = '=';
 441             end if;
 442          end loop;
 443
 444          --  Convert file name to all lower case if file names are not case
 445          --  sensitive. This ensures that we handle names in the canonical
 446          --  lower case format, regardless of the actual case.
 447
 448          if Lower and not File_Names_Case_Sensitive then
 449             Canonical_Case_File_Name (Name_Buffer (1 .. Name_Len));
 450          end if;
 451
 452          return Name_Find;
 453       end Get_Name;
 454
 455       -------------
 456       -- Get_Nat --
 457       -------------
 458
 459       function Get_Nat return Nat is
 460          V : Nat;
 461
 462       begin
 463          Skip_Space;
 464
 465          V := 0;
 466          loop
 467             V := V * 10 + (Character'Pos (Getc) - Character'Pos ('0'));
 468             exit when At_End_Of_Field;
 469             exit when Nextc < '0' or Nextc > '9';
 470          end loop;
 471
 472          return V;
 473       end Get_Nat;
 474
 475       ---------------
 476       -- Get_Stamp --
 477       ---------------
 478
 479       function Get_Stamp return Time_Stamp_Type is
 480          T     : Time_Stamp_Type;
 481          Start : Integer;
 482
 483       begin
 484          Skip_Space;
 485
 486          if At_Eol then
 487             if Ignore_Errors then
 488                return Dummy_Time_Stamp;
 489             else
 490                Fatal_Error;
 491             end if;
 492          end if;
 493
 494          --  Following reads old style time stamp missing first two digits
 495
 496          if Nextc in '7' .. '9' then
 497             T (1) := '1';
 498             T (2) := '9';
 499             Start := 3;
 500
 501          --  Normal case of full year in time stamp
 502
 503          else
 504             Start := 1;
 505          end if;
 506
 507          for J in Start .. T'Last loop
 508             T (J) := Getc;
 509          end loop;
 510
 511          return T;
 512       end Get_Stamp;
 513
 514       ----------
 515       -- Getc --
 516       ----------
 517
 518       function Getc return Character is
 519       begin
 520          if P = T'Last then
 521             return EOF;
 522          else
 523             P := P + 1;
 524             return T (P - 1);
 525          end if;
 526       end Getc;
 527
 528       -----------
 529       -- Nextc --
 530       -----------
 531
 532       function Nextc return Character is
 533       begin
 534          return T (P);
 535       end Nextc;
 536
 537       --------------
 538       -- Skip_Eol --
 539       --------------
 540
 541       procedure Skip_Eol is
 542       begin
 543          Skip_Space;
 544
 545          if not At_Eol then
 546             if Ignore_Errors then
 547                while not At_Eol loop
 548                   P := P + 1;
 549                end loop;
 550             else
 551                Fatal_Error;
 552             end if;
 553          end if;
 554
 555          --  Loop to skip past blank lines (first time through skips this EOL)
 556
 557          while Nextc < ' ' and then Nextc /= EOF loop
 558             if Nextc = LF then
 559                Line := Line + 1;
 560             end if;
 561
 562             P := P + 1;
 563          end loop;
 564       end Skip_Eol;
 565
 566       ---------------
 567       -- Skip_Line --
 568       ---------------
 569
 570       procedure Skip_Line is
 571       begin
 572          while not At_Eol loop
 573             P := P + 1;
 574          end loop;
 575
 576          Skip_Eol;
 577       end Skip_Line;
 578
 579       ----------------
 580       -- Skip_Space --
 581       ----------------
 582
 583       procedure Skip_Space is
 584       begin
 585          while Nextc = ' ' or else Nextc = HT loop
 586             P := P + 1;
 587          end loop;
 588       end Skip_Space;
 589
 590       -----------
 591       -- Skipc --
 592       -----------
 593
 594       procedure Skipc is
 595       begin
 596          if P /= T'Last then
 597             P := P + 1;
 598          end if;
 599       end Skipc;
 600
 601    --  Start of processing for Scan_ALI
 602
 603    begin
 604       First_Sdep_Entry := Sdep.Last + 1;
 605
 606       --  Acquire lines to be ignored
 607
 608       if Read_Xref then
 609          Ignore := ('U' | 'W' | 'D' | 'X' => False, others => True);
 610
 611       --  Read_Lines parameter given
 612
 613       elsif Read_Lines /= "" then
 614          Ignore := ('U' => False, others => True);
 615
 616          for J in Read_Lines'Range loop
 617             Ignore (Read_Lines (J)) := False;
 618          end loop;
 619
 620       --  Process Ignore_Lines parameter
 621
 622       else
 623          Ignore := (others => False);
 624
 625          for J in Ignore_Lines'Range loop
 626             pragma Assert (Ignore_Lines (J) /= 'U');
 627             Ignore (Ignore_Lines (J)) := True;
 628          end loop;
 629       end if;
 630
 631       --  Setup ALI Table entry with appropriate defaults
 632
 633       ALIs.Increment_Last;
 634       Id := ALIs.Last;
 635       Set_Name_Table_Info (F, Int (Id));
 636
 637       ALIs.Table (Id) := (
 638         Afile                      => F,
 639         Compile_Errors             => False,
 640         First_Interrupt_State      => Interrupt_States.Last + 1,
 641         First_Sdep                 => No_Sdep_Id,
 642         First_Unit                 => No_Unit_Id,
 643         Float_Format               => 'I',
 644         Last_Interrupt_State       => Interrupt_States.Last,
 645         Last_Sdep                  => No_Sdep_Id,
 646         Last_Unit                  => No_Unit_Id,
 647         Locking_Policy             => ' ',
 648         Main_Priority              => -1,
 649         Main_Program               => None,
 650         No_Object                  => False,
 651         Normalize_Scalars          => False,
 652         Ofile_Full_Name            => Full_Object_File_Name,
 653         Queuing_Policy             => ' ',
 654         Restrictions               => Restrictions_Initial,
 655         Sfile                      => No_Name,
 656         Task_Dispatching_Policy    => ' ',
 657         Time_Slice_Value           => -1,
 658         WC_Encoding                => '8',
 659         Unit_Exception_Table       => False,
 660         Ver                        => (others => ' '),
 661         Ver_Len                    => 0,
 662         Interface                  => False,
 663         Zero_Cost_Exceptions       => False);
 664
 665       --  Now we acquire the input lines from the ALI file. Note that the
 666       --  convention in the following code is that as we enter each section,
 667       --  C is set to contain the first character of the following line.
 668
 669       C := Getc;
 670       Check_Unknown_Line;
 671
 672       --  Acquire library version
 673
 674       if C /= 'V' then
 675
 676          --  The V line missing really indicates trouble, most likely it
 677          --  means we don't have an ALI file at all, so here we give a
 678          --  fatal error even if we are in Ignore_Errors mode.
 679
 680          Fatal_Error;
 681
 682       elsif Ignore ('V') then
 683          Skip_Line;
 684
 685       else
 686          Checkc (' ');
 687          Skip_Space;
 688          Checkc ('"');
 689
 690          for J in 1 .. Ver_Len_Max loop
 691             C := Getc;
 692             exit when C = '"';
 693             ALIs.Table (Id).Ver (J) := C;
 694             ALIs.Table (Id).Ver_Len := J;
 695          end loop;
 696
 697          Skip_Eol;
 698       end if;
 699
 700       C := Getc;
 701       Check_Unknown_Line;
 702
 703       --  Acquire main program line if present
 704
 705       if C = 'M' then
 706          if Ignore ('M') then
 707             Skip_Line;
 708
 709          else
 710             Checkc (' ');
 711             Skip_Space;
 712
 713             C := Getc;
 714
 715             if C = 'F' then
 716                ALIs.Table (Id).Main_Program := Func;
 717             elsif C = 'P' then
 718                ALIs.Table (Id).Main_Program := Proc;
 719             else
 720                P := P - 1;
 721                Fatal_Error;
 722             end if;
 723
 724             Skip_Space;
 725
 726             if not At_Eol then
 727                if Nextc < 'A' then
 728                   ALIs.Table (Id).Main_Priority := Get_Nat;
 729                end if;
 730
 731                Skip_Space;
 732
 733                if Nextc = 'T' then
 734                   P := P + 1;
 735                   Checkc ('=');
 736                   ALIs.Table (Id).Time_Slice_Value := Get_Nat;
 737                end if;
 738
 739                Skip_Space;
 740
 741                Checkc ('W');
 742                Checkc ('=');
 743                ALIs.Table (Id).WC_Encoding := Getc;
 744             end if;
 745
 746             Skip_Eol;
 747          end if;
 748
 749          C := Getc;
 750       end if;
 751
 752       --  Acquire argument lines
 753
 754       First_Arg := Args.Last + 1;
 755
 756       A_Loop : loop
 757          Check_Unknown_Line;
 758          exit A_Loop when C /= 'A';
 759
 760          if Ignore ('A') then
 761             Skip_Line;
 762
 763          else
 764             Checkc (' ');
 765             Name_Len := 0;
 766
 767             while not At_Eol loop
 768                Name_Len := Name_Len + 1;
 769                Name_Buffer (Name_Len) := Getc;
 770             end loop;
 771
 772             Args.Increment_Last;
 773             Args.Table (Args.Last) := new String'(Name_Buffer (1 .. Name_Len));
 774
 775             Skip_Eol;
 776          end if;
 777
 778          C := Getc;
 779       end loop A_Loop;
 780
 781       --  Acquire P line
 782
 783       Check_Unknown_Line;
 784
 785       while C /= 'P' loop
 786          if Ignore_Errors then
 787             if C = EOF then
 788                Fatal_Error;
 789             else
 790                Skip_Line;
 791             end if;
 792          else
 793             Fatal_Error;
 794          end if;
 795       end loop;
 796
 797       if Ignore ('P') then
 798          Skip_Line;
 799
 800       --  Process P line
 801
 802       else
 803          NS_Found := False;
 804
 805          while not At_Eol loop
 806             Checkc (' ');
 807             Skip_Space;
 808             C := Getc;
 809
 810             --  Processing for CE
 811
 812             if C = 'C' then
 813                Checkc ('E');
 814                ALIs.Table (Id).Compile_Errors := True;
 815
 816             --  Processing for FD/FG/FI
 817
 818             elsif C = 'F' then
 819                Float_Format_Specified := Getc;
 820                ALIs.Table (Id).Float_Format := Float_Format_Specified;
 821
 822             --  Processing for Lx
 823
 824             elsif C = 'L' then
 825                Locking_Policy_Specified := Getc;
 826                ALIs.Table (Id).Locking_Policy := Locking_Policy_Specified;
 827
 828             --  Processing for flags starting with N
 829
 830             elsif C = 'N' then
 831                C := Getc;
 832
 833                --  Processing for NO
 834
 835                if C = 'O' then
 836                   ALIs.Table (Id).No_Object := True;
 837                   No_Object_Specified := True;
 838
 839                --  Processing for NR
 840
 841                elsif C = 'R' then
 842                   No_Run_Time_Mode           := True;
 843                   Configurable_Run_Time_Mode := True;
 844
 845                --  Processing for NS
 846
 847                elsif C = 'S' then
 848                   ALIs.Table (Id).Normalize_Scalars := True;
 849                   Normalize_Scalars_Specified := True;
 850                   NS_Found := True;
 851
 852                --  Invalid switch starting with N
 853
 854                else
 855                   Fatal_Error_Ignore;
 856                end if;
 857
 858             --  Processing for Qx
 859
 860             elsif C = 'Q' then
 861                Queuing_Policy_Specified := Getc;
 862                ALIs.Table (Id).Queuing_Policy := Queuing_Policy_Specified;
 863
 864             --  Processing for flags starting with S
 865
 866             elsif C = 'S' then
 867                C := Getc;
 868
 869                --  Processing for SL
 870
 871                if C = 'L' then
 872                   ALIs.Table (Id).Interface := True;
 873
 874                --  Processing for SS
 875
 876                elsif C = 'S' then
 877                   Opt.Sec_Stack_Used := True;
 878
 879                --  Invalid switch starting with S
 880
 881                else
 882                   Fatal_Error_Ignore;
 883                end if;
 884
 885             --  Processing for Tx
 886
 887             elsif C = 'T' then
 888                Task_Dispatching_Policy_Specified := Getc;
 889                ALIs.Table (Id).Task_Dispatching_Policy :=
 890                  Task_Dispatching_Policy_Specified;
 891
 892             --  Processing for switch starting with U
 893
 894             elsif C = 'U' then
 895                C := Getc;
 896
 897                --  Processing for UA
 898
 899                if C  = 'A' then
 900                   Unreserve_All_Interrupts_Specified := True;
 901
 902                --  Processing for UX
 903
 904                elsif C = 'X' then
 905                   ALIs.Table (Id).Unit_Exception_Table := True;
 906
 907                --  Invalid switches starting with U
 908
 909                else
 910                   Fatal_Error_Ignore;
 911                end if;
 912
 913             --  Processing for ZX
 914
 915             elsif C = 'Z' then
 916                C := Getc;
 917
 918                if C = 'X' then
 919                   ALIs.Table (Id).Zero_Cost_Exceptions := True;
 920                   Zero_Cost_Exceptions_Specified := True;
 921                else
 922                   Fatal_Error_Ignore;
 923                end if;
 924
 925             --  Invalid parameter
 926
 927             else
 928                C := Getc;
 929                Fatal_Error_Ignore;
 930             end if;
 931          end loop;
 932
 933          if not NS_Found then
 934             No_Normalize_Scalars_Specified := True;
 935          end if;
 936
 937          Skip_Eol;
 938       end if;
 939
 940       C := Getc;
 941       Check_Unknown_Line;
 942
 943       --  Acquire restrictions line
 944
 945       while C /= 'R' loop
 946          if Ignore_Errors then
 947             if C = EOF then
 948                Fatal_Error;
 949             else
 950                Skip_Line;
 951             end if;
 952          else
 953             Fatal_Error;
 954          end if;
 955       end loop;
 956
 957       if Ignore ('R') then
 958          Skip_Line;
 959
 960       --  Process restrictions line
 961
 962       else
 963          Scan_Restrictions : declare
 964             Save_R : constant Restrictions_Info := Cumulative_Restrictions;
 965             --  Save cumulative restrictions in case we have a fatal error
 966
 967             Bad_R_Line : exception;
 968             --  Signal bad restrictions line
 969
 970          begin
 971             Checkc (' ');
 972             Skip_Space;
 973
 974             --  Acquire information for boolean restrictions
 975
 976             for R in All_Boolean_Restrictions loop
 977                C := Getc;
 978
 979                case C is
 980                   when 'v' =>
 981                      ALIs.Table (Id).Restrictions.Violated (R) := True;
 982                      Cumulative_Restrictions.Violated (R) := True;
 983
 984                   when 'r' =>
 985                      ALIs.Table (Id).Restrictions.Set (R) := True;
 986                      Cumulative_Restrictions.Set (R) := True;
 987
 988                   when 'n' =>
 989                      null;
 990
 991                   when others =>
 992                      Fatal_Error;
 993                end case;
 994             end loop;
 995
 996             --  Acquire information for parameter restrictions
 997
 998             for RP in All_Parameter_Restrictions loop
 999
1000                --  Acquire restrictions pragma information
1001
1002                case Getc is
1003                   when 'n' =>
1004                      null;
1005
1006                   when 'r' =>
1007                      ALIs.Table (Id).Restrictions.Set (RP) := True;
1008
1009                      declare
1010                         N : constant Integer := Integer (Get_Nat);
1011                      begin
1012                         ALIs.Table (Id).Restrictions.Value (RP) := N;
1013
1014                         if Cumulative_Restrictions.Set (RP) then
1015                            Cumulative_Restrictions.Value (RP) :=
1016                              Integer'Min
1017                                (Cumulative_Restrictions.Value (RP), N);
1018                         else
1019                            Cumulative_Restrictions.Set (RP) := True;
1020                            Cumulative_Restrictions.Value (RP) := N;
1021                         end if;
1022                      end;
1023
1024                   when others =>
1025                      Fatal_Error;
1026                end case;
1027
1028                --  Acquire restrictions violations information
1029
1030                case Getc is
1031                   when 'n' =>
1032                      null;
1033
1034                   when 'v' =>
1035                      ALIs.Table (Id).Restrictions.Violated (RP) := True;
1036                      Cumulative_Restrictions.Violated (RP) := True;
1037
1038                      declare
1039                         N : constant Integer := Integer (Get_Nat);
1040                         pragma Unsuppress (Overflow_Check);
1041
1042                      begin
1043                         ALIs.Table (Id).Restrictions.Count (RP) := N;
1044
1045                         if RP in Checked_Max_Parameter_Restrictions then
1046                            Cumulative_Restrictions.Count (RP) :=
1047                              Integer'Max
1048                                (Cumulative_Restrictions.Count (RP), N);
1049                         else
1050                            Cumulative_Restrictions.Count (RP) :=
1051                              Cumulative_Restrictions.Count (RP) + N;
1052                         end if;
1053
1054                      exception
1055                         when Constraint_Error =>
1056
1057                            --  A constraint error comes from the addition in
1058                            --  the else branch. We reset to the maximum and
1059                            --  indicate that the real value is now unknown.
1060
1061                            Cumulative_Restrictions.Value (RP) := Integer'Last;
1062                            Cumulative_Restrictions.Unknown (RP) := True;
1063                      end;
1064
1065                      if Nextc = '+' then
1066                         Skipc;
1067                         ALIs.Table (Id).Restrictions.Unknown (RP) := True;
1068                         Cumulative_Restrictions.Unknown (RP) := True;
1069                      end if;
1070
1071                   when others =>
1072                      Fatal_Error;
1073                end case;
1074             end loop;
1075
1076             Skip_Eol;
1077
1078          --  Here if error during scanning of restrictions line
1079
1080          exception
1081             when Bad_R_Line =>
1082
1083                --  In Ignore_Errors mode, undo any changes to restrictions
1084                --  from this unit, and continue on.
1085
1086                if Ignore_Errors then
1087                   Cumulative_Restrictions := Save_R;
1088                   ALIs.Table (Id).Restrictions := Restrictions_Initial;
1089
1090                --  In normal mode, this is a fatal error
1091
1092                else
1093                   Fatal_Error;
1094                end if;
1095
1096          end Scan_Restrictions;
1097       end if;
1098
1099       --  Acquire 'I' lines if present
1100
1101       C := Getc;
1102       Check_Unknown_Line;
1103
1104       while C = 'I' loop
1105          if Ignore ('I') then
1106             Skip_Line;
1107
1108          else
1109             declare
1110                Int_Num : Nat;
1111                I_State : Character;
1112                Line_No : Nat;
1113
1114             begin
1115                Int_Num := Get_Nat;
1116                Skip_Space;
1117                I_State := Getc;
1118                Line_No := Get_Nat;
1119
1120                Interrupt_States.Append (
1121                  (Interrupt_Id    => Int_Num,
1122                   Interrupt_State => I_State,
1123                   IS_Pragma_Line  => Line_No));
1124
1125                ALIs.Table (Id).Last_Interrupt_State := Interrupt_States.Last;
1126                Skip_Eol;
1127             end;
1128          end if;
1129
1130          C := Getc;
1131       end loop;
1132
1133       --  Loop to acquire unit entries
1134
1135       U_Loop : loop
1136          Check_Unknown_Line;
1137          exit U_Loop when C /= 'U';
1138
1139          --  Note: as per spec, we never ignore U lines
1140
1141          Checkc (' ');
1142          Skip_Space;
1143          Units.Increment_Last;
1144
1145          if ALIs.Table (Id).First_Unit = No_Unit_Id then
1146             ALIs.Table (Id).First_Unit := Units.Last;
1147          end if;
1148
1149          Units.Table (Units.Last).Uname           := Get_Name;
1150          Units.Table (Units.Last).Predefined      := Is_Predefined_Unit;
1151          Units.Table (Units.Last).Internal        := Is_Internal_Unit;
1152          Units.Table (Units.Last).My_ALI          := Id;
1153          Units.Table (Units.Last).Sfile           := Get_Name (Lower => True);
1154          Units.Table (Units.Last).Pure            := False;
1155          Units.Table (Units.Last).Preelab         := False;
1156          Units.Table (Units.Last).No_Elab         := False;
1157          Units.Table (Units.Last).Shared_Passive  := False;
1158          Units.Table (Units.Last).RCI             := False;
1159          Units.Table (Units.Last).Remote_Types    := False;
1160          Units.Table (Units.Last).Has_RACW        := False;
1161          Units.Table (Units.Last).Init_Scalars    := False;
1162          Units.Table (Units.Last).Is_Generic      := False;
1163          Units.Table (Units.Last).Icasing         := Mixed_Case;
1164          Units.Table (Units.Last).Kcasing         := All_Lower_Case;
1165          Units.Table (Units.Last).Dynamic_Elab    := False;
1166          Units.Table (Units.Last).Elaborate_Body  := False;
1167          Units.Table (Units.Last).Set_Elab_Entity := False;
1168          Units.Table (Units.Last).Version         := "00000000";
1169          Units.Table (Units.Last).First_With      := Withs.Last + 1;
1170          Units.Table (Units.Last).First_Arg       := First_Arg;
1171          Units.Table (Units.Last).Elab_Position   := 0;
1172          Units.Table (Units.Last).Interface       := ALIs.Table (Id).Interface;
1173
1174          if Debug_Flag_U then
1175             Write_Str (" ----> reading unit ");
1176             Write_Int (Int (Units.Last));
1177             Write_Str ("  ");
1178             Write_Unit_Name (Units.Table (Units.Last).Uname);
1179             Write_Str (" from file ");
1180             Write_Name (Units.Table (Units.Last).Sfile);
1181             Write_Eol;
1182          end if;
1183
1184          --  Check for duplicated unit in different files
1185
1186          declare
1187             Info : constant Int := Get_Name_Table_Info
1188                                      (Units.Table (Units.Last).Uname);
1189          begin
1190             if Info /= 0
1191               and then Units.Table (Units.Last).Sfile /=
1192                        Units.Table (Unit_Id (Info)).Sfile
1193             then
1194                --  If Err is set then ignore duplicate unit name. This is the
1195                --  case of a call from gnatmake, where the situation can arise
1196                --  from substitution of source files. In such situations, the
1197                --  processing in gnatmake will always result in any required
1198                --  recompilations in any case, and if we consider this to be
1199                --  an error we get strange cases (for example when a generic
1200                --  instantiation is replaced by a normal package) where we
1201                --  read the old ali file, decide to recompile, and then decide
1202                --  that the old and new ali files are incompatible.
1203
1204                if Err then
1205                   null;
1206
1207                --  If Err is not set, then this is a fatal error. This is
1208                --  the case of being called from the binder, where we must
1209                --  definitely diagnose this as an error.
1210
1211                else
1212                   Set_Standard_Error;
1213                   Write_Str ("error: duplicate unit name: ");
1214                   Write_Eol;
1215
1216                   Write_Str ("error: unit """);
1217                   Write_Unit_Name (Units.Table (Units.Last).Uname);
1218                   Write_Str (""" found in file """);
1219                   Write_Name_Decoded (Units.Table (Units.Last).Sfile);
1220                   Write_Char ('"');
1221                   Write_Eol;
1222
1223                   Write_Str ("error: unit """);
1224                   Write_Unit_Name (Units.Table (Unit_Id (Info)).Uname);
1225                   Write_Str (""" found in file """);
1226                   Write_Name_Decoded (Units.Table (Unit_Id (Info)).Sfile);
1227                   Write_Char ('"');
1228                   Write_Eol;
1229
1230                   Exit_Program (E_Fatal);
1231                end if;
1232             end if;
1233          end;
1234
1235          Set_Name_Table_Info
1236            (Units.Table (Units.Last).Uname, Int (Units.Last));
1237
1238          --  Scan out possible version and other parameters
1239
1240          loop
1241             Skip_Space;
1242             exit when At_Eol;
1243             C := Getc;
1244
1245             --  Version field
1246
1247             if C in '0' .. '9' or else C in 'a' .. 'f' then
1248                Units.Table (Units.Last).Version (1) := C;
1249
1250                for J in 2 .. 8 loop
1251                   C := Getc;
1252                   Units.Table (Units.Last).Version (J) := C;
1253                end loop;
1254
1255             --  BN parameter (Body needed)
1256
1257             elsif C = 'B' then
1258                C := Getc;
1259
1260                if C = 'N' then
1261                   Check_At_End_Of_Field;
1262                   Units.Table (Units.Last).Body_Needed_For_SAL := True;
1263                else
1264                   Fatal_Error_Ignore;
1265                end if;
1266
1267
1268             --  DE parameter (Dynamic elaboration checks)
1269
1270             elsif C = 'D' then
1271                C := Getc;
1272
1273                if C = 'E' then
1274                   Check_At_End_Of_Field;
1275                   Units.Table (Units.Last).Dynamic_Elab := True;
1276                   Dynamic_Elaboration_Checks_Specified := True;
1277                else
1278                   Fatal_Error_Ignore;
1279                end if;
1280
1281             --  EB/EE parameters
1282
1283             elsif C = 'E' then
1284                C := Getc;
1285
1286                if C = 'B' then
1287                   Units.Table (Units.Last).Elaborate_Body := True;
1288                elsif C = 'E' then
1289                   Units.Table (Units.Last).Set_Elab_Entity := True;
1290                else
1291                   Fatal_Error_Ignore;
1292                end if;
1293
1294                Check_At_End_Of_Field;
1295
1296             --  GE parameter (generic)
1297
1298             elsif C = 'G' then
1299                C := Getc;
1300
1301                if C = 'E' then
1302                   Check_At_End_Of_Field;
1303                   Units.Table (Units.Last).Is_Generic := True;
1304                else
1305                   Fatal_Error_Ignore;
1306                end if;
1307
1308             --  IL/IS/IU parameters
1309
1310             elsif C = 'I' then
1311                C := Getc;
1312
1313                if C = 'L' then
1314                   Units.Table (Units.Last).Icasing := All_Lower_Case;
1315                elsif C = 'S' then
1316                   Units.Table (Units.Last).Init_Scalars := True;
1317                   Initialize_Scalars_Used := True;
1318                elsif C = 'U' then
1319                   Units.Table (Units.Last).Icasing := All_Upper_Case;
1320                else
1321                   Fatal_Error_Ignore;
1322                end if;
1323
1324                Check_At_End_Of_Field;
1325
1326             --  KM/KU parameters
1327
1328             elsif C = 'K' then
1329                C := Getc;
1330
1331                if C = 'M' then
1332                   Units.Table (Units.Last).Kcasing := Mixed_Case;
1333                elsif C = 'U' then
1334                   Units.Table (Units.Last).Kcasing := All_Upper_Case;
1335                else
1336                   Fatal_Error_Ignore;
1337                end if;
1338
1339                Check_At_End_Of_Field;
1340
1341             --  NE parameter
1342
1343             elsif C = 'N' then
1344                C := Getc;
1345
1346                if C = 'E' then
1347                   Units.Table (Units.Last).No_Elab := True;
1348                   Check_At_End_Of_Field;
1349                else
1350                   Fatal_Error_Ignore;
1351                end if;
1352
1353
1354             --  PR/PU/PK parameters
1355
1356             elsif C = 'P' then
1357                C := Getc;
1358
1359                if C = 'R' then
1360                   Units.Table (Units.Last).Preelab := True;
1361                elsif C = 'U' then
1362                   Units.Table (Units.Last).Pure := True;
1363                elsif C = 'K' then
1364                   Units.Table (Units.Last).Unit_Kind := 'p';
1365                else
1366                   Fatal_Error_Ignore;
1367                end if;
1368
1369                Check_At_End_Of_Field;
1370
1371             --  RC/RT parameters
1372
1373             elsif C = 'R' then
1374                C := Getc;
1375
1376                if C = 'C' then
1377                   Units.Table (Units.Last).RCI := True;
1378                elsif C = 'T' then
1379                   Units.Table (Units.Last).Remote_Types := True;
1380                elsif C = 'A' then
1381                   Units.Table (Units.Last).Has_RACW := True;
1382                else
1383                   Fatal_Error_Ignore;
1384                end if;
1385
1386                Check_At_End_Of_Field;
1387
1388             elsif C = 'S' then
1389                C := Getc;
1390
1391                if C = 'P' then
1392                   Units.Table (Units.Last).Shared_Passive := True;
1393                elsif C = 'U' then
1394                   Units.Table (Units.Last).Unit_Kind := 's';
1395                else
1396                   Fatal_Error_Ignore;
1397                end if;
1398
1399                Check_At_End_Of_Field;
1400
1401             else
1402                C := Getc;
1403                Fatal_Error_Ignore;
1404             end if;
1405          end loop;
1406
1407          Skip_Eol;
1408
1409          --  Check if static elaboration model used
1410
1411          if not Units.Table (Units.Last).Dynamic_Elab
1412            and then not Units.Table (Units.Last).Internal
1413          then
1414             Static_Elaboration_Model_Used := True;
1415          end if;
1416
1417          C := Getc;
1418
1419          --  Scan out With lines for this unit
1420
1421          With_Loop : loop
1422             Check_Unknown_Line;
1423             exit With_Loop when C /= 'W';
1424
1425             if Ignore ('W') then
1426                Skip_Line;
1427
1428             else
1429                Checkc (' ');
1430                Skip_Space;
1431                Withs.Increment_Last;
1432                Withs.Table (Withs.Last).Uname              := Get_Name;
1433                Withs.Table (Withs.Last).Elaborate          := False;
1434                Withs.Table (Withs.Last).Elaborate_All      := False;
1435                Withs.Table (Withs.Last).Elab_All_Desirable := False;
1436                Withs.Table (Withs.Last).Interface          := False;
1437
1438                --  Generic case with no object file available
1439
1440                if At_Eol then
1441                   Withs.Table (Withs.Last).Sfile := No_File;
1442                   Withs.Table (Withs.Last).Afile := No_File;
1443
1444                --  Normal case
1445
1446                else
1447                   Withs.Table (Withs.Last).Sfile := Get_Name (Lower => True);
1448                   Withs.Table (Withs.Last).Afile := Get_Name;
1449
1450                   --  Scan out possible E, EA, and NE parameters
1451
1452                   while not At_Eol loop
1453                      Skip_Space;
1454
1455                      if Nextc = 'E' then
1456                         P := P + 1;
1457
1458                         if At_End_Of_Field then
1459                            Withs.Table (Withs.Last).Elaborate := True;
1460
1461                         elsif Nextc = 'A' then
1462                            P := P + 1;
1463                            Check_At_End_Of_Field;
1464                            Withs.Table (Withs.Last).Elaborate_All := True;
1465
1466                         else
1467                            Checkc ('D');
1468                            Check_At_End_Of_Field;
1469
1470                            --  Store ED indication unless ignore required
1471
1472                            if not Ignore_ED then
1473                               Withs.Table (Withs.Last).Elab_All_Desirable :=
1474                                 True;
1475                            end if;
1476                         end if;
1477                      end if;
1478                   end loop;
1479                end if;
1480
1481                Skip_Eol;
1482             end if;
1483
1484             C := Getc;
1485          end loop With_Loop;
1486
1487          Units.Table (Units.Last).Last_With := Withs.Last;
1488          Units.Table (Units.Last).Last_Arg  := Args.Last;
1489
1490          --  If there are linker options lines present, scan them
1491
1492          Name_Len := 0;
1493
1494          Linker_Options_Loop : loop
1495             Check_Unknown_Line;
1496             exit Linker_Options_Loop when C /= 'L';
1497
1498             if Ignore ('L') then
1499                Skip_Line;
1500
1501             else
1502                Checkc (' ');
1503                Skip_Space;
1504                Checkc ('"');
1505
1506                loop
1507                   C := Getc;
1508
1509                   if C < Character'Val (16#20#)
1510                     or else C > Character'Val (16#7E#)
1511                   then
1512                      Fatal_Error_Ignore;
1513
1514                   elsif C = '{' then
1515                      C := Character'Val (0);
1516
1517                      declare
1518                         V : Natural;
1519
1520                      begin
1521                         V := 0;
1522                         for J in 1 .. 2 loop
1523                            C := Getc;
1524
1525                            if C in '0' .. '9' then
1526                               V := V * 16 +
1527                                      Character'Pos (C) -
1528                                        Character'Pos ('0');
1529
1530                            elsif C in 'A' .. 'F' then
1531                               V := V * 16 +
1532                                      Character'Pos (C) -
1533                                        Character'Pos ('A') +
1534                                          10;
1535
1536                            else
1537                               Fatal_Error_Ignore;
1538                            end if;
1539                         end loop;
1540
1541                         Checkc ('}');
1542                         Add_Char_To_Name_Buffer (Character'Val (V));
1543                      end;
1544
1545                   else
1546                      if C = '"' then
1547                         exit when Nextc /= '"';
1548                         C := Getc;
1549                      end if;
1550
1551                      Add_Char_To_Name_Buffer (C);
1552                   end if;
1553                end loop;
1554
1555                Add_Char_To_Name_Buffer (nul);
1556                Skip_Eol;
1557             end if;
1558
1559             C := Getc;
1560          end loop Linker_Options_Loop;
1561
1562          --  Store the linker options entry if one was found
1563
1564          if Name_Len /= 0 then
1565             Linker_Options.Increment_Last;
1566
1567             Linker_Options.Table (Linker_Options.Last).Name :=
1568               Name_Enter;
1569
1570             Linker_Options.Table (Linker_Options.Last).Unit :=
1571               Units.Last;
1572
1573             Linker_Options.Table (Linker_Options.Last).Internal_File :=
1574               Is_Internal_File_Name (F);
1575
1576             Linker_Options.Table (Linker_Options.Last).Original_Pos :=
1577               Linker_Options.Last;
1578          end if;
1579       end loop U_Loop;
1580
1581       --  End loop through units for one ALI file
1582
1583       ALIs.Table (Id).Last_Unit := Units.Last;
1584       ALIs.Table (Id).Sfile := Units.Table (ALIs.Table (Id).First_Unit).Sfile;
1585
1586       --  Set types of the units (there can be at most 2 of them)
1587
1588       if ALIs.Table (Id).First_Unit /= ALIs.Table (Id).Last_Unit then
1589          Units.Table (ALIs.Table (Id).First_Unit).Utype := Is_Body;
1590          Units.Table (ALIs.Table (Id).Last_Unit).Utype  := Is_Spec;
1591
1592       else
1593          --  Deal with body only and spec only cases, note that the reason we
1594          --  do our own checking of the name (rather than using Is_Body_Name)
1595          --  is that Uname drags in far too much compiler junk!
1596
1597          Get_Name_String (Units.Table (Units.Last).Uname);
1598
1599          if Name_Buffer (Name_Len) = 'b' then
1600             Units.Table (Units.Last).Utype := Is_Body_Only;
1601          else
1602             Units.Table (Units.Last).Utype := Is_Spec_Only;
1603          end if;
1604       end if;
1605
1606       --  Scan out external version references and put in hash table
1607
1608       E_Loop : loop
1609          Check_Unknown_Line;
1610          exit E_Loop when C /= 'E';
1611
1612          if Ignore ('E') then
1613             Skip_Line;
1614
1615          else
1616             Checkc (' ');
1617             Skip_Space;
1618
1619             Name_Len := 0;
1620             Name_Len := 0;
1621             loop
1622                C := Getc;
1623
1624                if C < ' ' then
1625                   Fatal_Error;
1626                end if;
1627
1628                exit when At_End_Of_Field;
1629                Add_Char_To_Name_Buffer (C);
1630             end loop;
1631
1632             Version_Ref.Set (new String'(Name_Buffer (1 .. Name_Len)), True);
1633             Skip_Eol;
1634          end if;
1635
1636          C := Getc;
1637       end loop E_Loop;
1638
1639       --  Scan out source dependency lines for this ALI file
1640
1641       ALIs.Table (Id).First_Sdep := Sdep.Last + 1;
1642
1643       D_Loop : loop
1644          Check_Unknown_Line;
1645          exit D_Loop when C /= 'D';
1646
1647          if Ignore ('D') then
1648             Skip_Line;
1649
1650          else
1651             Checkc (' ');
1652             Skip_Space;
1653             Sdep.Increment_Last;
1654             Sdep.Table (Sdep.Last).Sfile := Get_Name (Lower => True);
1655             Sdep.Table (Sdep.Last).Stamp := Get_Stamp;
1656             Sdep.Table (Sdep.Last).Dummy_Entry :=
1657               (Sdep.Table (Sdep.Last).Stamp = Dummy_Time_Stamp);
1658
1659             --  Acquire checksum value
1660
1661             Skip_Space;
1662
1663             declare
1664                Ctr : Natural;
1665                Chk : Word;
1666
1667             begin
1668                Ctr := 0;
1669                Chk := 0;
1670
1671                loop
1672                   exit when At_Eol or else Ctr = 8;
1673
1674                   if Nextc in '0' .. '9' then
1675                      Chk := Chk * 16 +
1676                               Character'Pos (Nextc) - Character'Pos ('0');
1677
1678                   elsif Nextc in 'a' .. 'f' then
1679                      Chk := Chk * 16 +
1680                               Character'Pos (Nextc) - Character'Pos ('a') + 10;
1681
1682                   else
1683                      exit;
1684                   end if;
1685
1686                   Ctr := Ctr + 1;
1687                   P := P + 1;
1688                end loop;
1689
1690                if Ctr = 8 and then At_End_Of_Field then
1691                   Sdep.Table (Sdep.Last).Checksum := Chk;
1692                else
1693                   Fatal_Error;
1694                end if;
1695             end;
1696
1697             --  Acquire subunit and reference file name entries
1698
1699             Sdep.Table (Sdep.Last).Subunit_Name := No_Name;
1700             Sdep.Table (Sdep.Last).Rfile        :=
1701               Sdep.Table (Sdep.Last).Sfile;
1702             Sdep.Table (Sdep.Last).Start_Line   := 1;
1703
1704             if not At_Eol then
1705                Skip_Space;
1706
1707                --  Here for subunit name
1708
1709                if Nextc not in '0' .. '9' then
1710                   Name_Len := 0;
1711
1712                   while not At_End_Of_Field loop
1713                      Name_Len := Name_Len + 1;
1714                      Name_Buffer (Name_Len) := Getc;
1715                   end loop;
1716
1717                   Sdep.Table (Sdep.Last).Subunit_Name := Name_Enter;
1718                   Skip_Space;
1719                end if;
1720
1721                --  Here for reference file name entry
1722
1723                if Nextc in '0' .. '9' then
1724                   Sdep.Table (Sdep.Last).Start_Line := Get_Nat;
1725                   Checkc (':');
1726
1727                   Name_Len := 0;
1728
1729                   while not At_End_Of_Field loop
1730                      Name_Len := Name_Len + 1;
1731                      Name_Buffer (Name_Len) := Getc;
1732                   end loop;
1733
1734                   Sdep.Table (Sdep.Last).Rfile := Name_Enter;
1735                end if;
1736             end if;
1737
1738             Skip_Eol;
1739          end if;
1740
1741          C := Getc;
1742       end loop D_Loop;
1743
1744       ALIs.Table (Id).Last_Sdep := Sdep.Last;
1745
1746       --  We must at this stage be at an Xref line or the end of file
1747
1748       if C = EOF then
1749          return Id;
1750       end if;
1751
1752       Check_Unknown_Line;
1753
1754       if C /= 'X' then
1755          Fatal_Error;
1756       end if;
1757
1758       --  If we are ignoring Xref sections we are done (we ignore all
1759       --  remaining lines since only xref related lines follow X).
1760
1761       if Ignore ('X') and then not Debug_Flag_X then
1762          return Id;
1763       end if;
1764
1765       --  Loop through Xref sections
1766
1767       X_Loop : loop
1768          Check_Unknown_Line;
1769          exit X_Loop when C /= 'X';
1770
1771          --  Make new entry in section table
1772
1773          Xref_Section.Increment_Last;
1774
1775          Read_Refs_For_One_File : declare
1776             XS : Xref_Section_Record renames
1777                    Xref_Section.Table (Xref_Section.Last);
1778
1779             Current_File_Num : Sdep_Id;
1780             --  Keeps track of the current file number (changed by nn|)
1781
1782          begin
1783             XS.File_Num     := Sdep_Id (Get_Nat + Nat (First_Sdep_Entry) - 1);
1784             XS.File_Name    := Get_Name;
1785             XS.First_Entity := Xref_Entity.Last + 1;
1786
1787             Current_File_Num := XS.File_Num;
1788
1789             Skip_Space;
1790
1791             Skip_Eol;
1792             C := Nextc;
1793
1794             --  Loop through Xref entities
1795
1796             while C /= 'X' and then C /= EOF loop
1797                Xref_Entity.Increment_Last;
1798
1799                Read_Refs_For_One_Entity : declare
1800                   XE : Xref_Entity_Record renames
1801                          Xref_Entity.Table (Xref_Entity.Last);
1802                   N  : Nat;
1803
1804                   procedure Read_Instantiation_Reference;
1805                   --  Acquire instantiation reference. Caller has checked
1806                   --  that current character is '[' and on return the cursor
1807                   --  is skipped past the corresponding closing ']'.
1808
1809                   ----------------------------------
1810                   -- Read_Instantiation_Reference --
1811                   ----------------------------------
1812
1813                   procedure Read_Instantiation_Reference is
1814                      Local_File_Num : Sdep_Id := Current_File_Num;
1815
1816                   begin
1817                      Xref.Increment_Last;
1818
1819                      declare
1820                         XR : Xref_Record renames Xref.Table (Xref.Last);
1821
1822                      begin
1823                         P := P + 1; -- skip [
1824                         N := Get_Nat;
1825
1826                         if Nextc = '|' then
1827                            XR.File_Num :=
1828                              Sdep_Id (N + Nat (First_Sdep_Entry) - 1);
1829                            Local_File_Num := XR.File_Num;
1830                            P := P + 1;
1831                            N := Get_Nat;
1832
1833                         else
1834                            XR.File_Num := Local_File_Num;
1835                         end if;
1836
1837                         XR.Line  := N;
1838                         XR.Rtype := ' ';
1839                         XR.Col   := 0;
1840
1841                         --  Recursive call for next reference
1842
1843                         if Nextc = '[' then
1844                            pragma Warnings (Off); -- kill recursion warning
1845                            Read_Instantiation_Reference;
1846                            pragma Warnings (On);
1847                         end if;
1848
1849                         --  Skip closing bracket after recursive call
1850
1851                         P := P + 1;
1852                      end;
1853                   end Read_Instantiation_Reference;
1854
1855                --  Start of processing for Read_Refs_For_One_Entity
1856
1857                begin
1858                   XE.Line   := Get_Nat;
1859                   XE.Etype  := Getc;
1860                   XE.Col    := Get_Nat;
1861                   XE.Lib    := (Getc = '*');
1862                   XE.Entity := Get_Name;
1863
1864                   Current_File_Num := XS.File_Num;
1865
1866                   --  Renaming reference is present
1867
1868                   if Nextc = '=' then
1869                      P := P + 1;
1870                      XE.Rref_Line := Get_Nat;
1871
1872                      if Getc /= ':' then
1873                         Fatal_Error;
1874                      end if;
1875
1876                      XE.Rref_Col := Get_Nat;
1877
1878                   --  No renaming reference present
1879
1880                   else
1881                      XE.Rref_Line := 0;
1882                      XE.Rref_Col  := 0;
1883                   end if;
1884
1885                   Skip_Space;
1886
1887                   --  See if type reference present
1888
1889                   case Nextc is
1890                      when '<'    => XE.Tref := Tref_Derived;
1891                      when '('    => XE.Tref := Tref_Access;
1892                      when '{'    => XE.Tref := Tref_Type;
1893                      when others => XE.Tref := Tref_None;
1894                   end case;
1895
1896                   --  Case of typeref field present
1897
1898                   if XE.Tref /= Tref_None then
1899                      P := P + 1; -- skip opening bracket
1900
1901                      if Nextc in 'a' .. 'z' then
1902                         XE.Tref_File_Num        := No_Sdep_Id;
1903                         XE.Tref_Line            := 0;
1904                         XE.Tref_Type            := ' ';
1905                         XE.Tref_Col             := 0;
1906                         XE.Tref_Standard_Entity :=
1907                           Get_Name (Ignore_Spaces => True);
1908
1909                      else
1910                         N := Get_Nat;
1911
1912                         if Nextc = '|' then
1913                            XE.Tref_File_Num :=
1914                              Sdep_Id (N + Nat (First_Sdep_Entry) - 1);
1915                            P := P + 1;
1916                            N := Get_Nat;
1917
1918                         else
1919                            XE.Tref_File_Num := Current_File_Num;
1920                         end if;
1921
1922                         XE.Tref_Line            := N;
1923                         XE.Tref_Type            := Getc;
1924                         XE.Tref_Col             := Get_Nat;
1925                         XE.Tref_Standard_Entity := No_Name;
1926                      end if;
1927
1928                      --  ??? Temporary workaround for nested generics case:
1929                      --     4i4 Directories{1|4I9[4|6[3|3]]}
1930                      --  See C918-002
1931
1932                      declare
1933                         Nested_Brackets : Natural := 0;
1934
1935                      begin
1936                         loop
1937                            case Nextc is
1938                               when '['   =>
1939                                  Nested_Brackets := Nested_Brackets + 1;
1940                               when ']' =>
1941                                  Nested_Brackets := Nested_Brackets - 1;
1942                               when others =>
1943                                  if Nested_Brackets = 0 then
1944                                     exit;
1945                                  end if;
1946                            end case;
1947
1948                            Skipc;
1949                         end loop;
1950                      end;
1951
1952                      P := P + 1; -- skip closing bracket
1953                      Skip_Space;
1954
1955                   --  No typeref entry present
1956
1957                   else
1958                      XE.Tref_File_Num        := No_Sdep_Id;
1959                      XE.Tref_Line            := 0;
1960                      XE.Tref_Type            := ' ';
1961                      XE.Tref_Col             := 0;
1962                      XE.Tref_Standard_Entity := No_Name;
1963                   end if;
1964
1965                   XE.First_Xref := Xref.Last + 1;
1966
1967                   --  Loop through cross-references for this entity
1968
1969                   loop
1970                      Skip_Space;
1971
1972                      if At_Eol then
1973                         Skip_Eol;
1974                         exit when Nextc /= '.';
1975                         P := P + 1;
1976                      end if;
1977
1978                      Xref.Increment_Last;
1979
1980                      declare
1981                         XR : Xref_Record renames Xref.Table (Xref.Last);
1982
1983                      begin
1984                         N := Get_Nat;
1985
1986                         if Nextc = '|' then
1987                            XR.File_Num :=
1988                              Sdep_Id (N + Nat (First_Sdep_Entry) - 1);
1989                            Current_File_Num := XR.File_Num;
1990                            P := P + 1;
1991                            N := Get_Nat;
1992                         else
1993                            XR.File_Num := Current_File_Num;
1994                         end if;
1995
1996                         XR.Line  := N;
1997                         XR.Rtype := Getc;
1998
1999                         --  Imported entities reference as in:
2000                         --    494b<c,__gnat_copy_attribs>25
2001                         --  ??? Simply skipped for now
2002
2003                         if Nextc = '<' then
2004                            while Getc /= '>' loop
2005                               null;
2006                            end loop;
2007                         end if;
2008
2009                         XR.Col   := Get_Nat;
2010
2011                         if Nextc = '[' then
2012                            Read_Instantiation_Reference;
2013                         end if;
2014                      end;
2015                   end loop;
2016
2017                   --  Record last cross-reference
2018
2019                   XE.Last_Xref := Xref.Last;
2020                   C := Nextc;
2021                end Read_Refs_For_One_Entity;
2022             end loop;
2023
2024             --  Record last entity
2025
2026             XS.Last_Entity := Xref_Entity.Last;
2027
2028          end Read_Refs_For_One_File;
2029
2030          C := Getc;
2031       end loop X_Loop;
2032
2033       --  Here after dealing with xref sections
2034
2035       if C /= EOF and then C /= 'X' then
2036          Fatal_Error;
2037       end if;
2038
2039       return Id;
2040
2041    exception
2042       when Bad_ALI_Format =>
2043          return No_ALI_Id;
2044
2045    end Scan_ALI;
2046
2047    ---------
2048    -- SEq --
2049    ---------
2050
2051    function SEq (F1, F2 : String_Ptr) return Boolean is
2052    begin
2053       return F1.all = F2.all;
2054    end SEq;
2055
2056    -----------
2057    -- SHash --
2058    -----------
2059
2060    function SHash (S : String_Ptr) return Vindex is
2061       H : Word;
2062
2063    begin
2064       H := 0;
2065       for J in S.all'Range loop
2066          H := H * 2 + Character'Pos (S (J));
2067       end loop;
2068
2069       return Vindex (Vindex'First + Vindex (H mod Vindex'Range_Length));
2070    end SHash;
2071
2072 end ALI;