gcc/ada/prepcomp.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                             P R E P C O M P                              --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 2003-2007, 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 with Ada.Unchecked_Deallocation;
  27
  28 with Errout;   use Errout;
  29 with Lib.Writ; use Lib.Writ;
  30 with Opt;      use Opt;
  31 with Osint;    use Osint;
  32 with Prep;     use Prep;
  33 with Scans;    use Scans;
  34 with Scn;      use Scn;
  35 with Sinput.L; use Sinput.L;
  36 with Stringt;  use Stringt;
  37 with Table;
  38 with Types;    use Types;
  39
  40 package body Prepcomp is
  41
  42    No_Preprocessing : Boolean := True;
  43    --  Set to False if there is at least one source that needs to be
  44    --  preprocessed.
  45
  46    Source_Index_Of_Preproc_Data_File : Source_File_Index := No_Source_File;
  47
  48    --  The following variable should be a constant, but this is not
  49    --  possible. Warnings are Off because it is never assigned a value.
  50
  51    pragma Warnings (Off);
  52    No_Mapping : Prep.Symbol_Table.Instance;
  53    pragma Warnings (On);
  54
  55    type String_Ptr is access String;
  56    type String_Array is array (Positive range <>) of String_Ptr;
  57    type String_Array_Ptr is access String_Array;
  58
  59    procedure Free is
  60       new Ada.Unchecked_Deallocation (String_Array, String_Array_Ptr);
  61
  62    Symbol_Definitions : String_Array_Ptr := new String_Array (1 .. 4);
  63    --  An extensible array to temporarily stores symbol definitions specified
  64    --  on the command line with -gnateD switches.
  65
  66    Last_Definition : Natural := 0;
  67    --  Index of last symbol definition in array Symbol_Definitions
  68
  69    type Preproc_Data is record
  70       Mapping      : Symbol_Table.Instance;
  71       File_Name    : File_Name_Type := No_File;
  72       Deffile      : String_Id      := No_String;
  73       Undef_False  : Boolean        := False;
  74       Always_Blank : Boolean        := False;
  75       Comments     : Boolean        := False;
  76       List_Symbols : Boolean        := False;
  77       Processed    : Boolean        := False;
  78    end record;
  79    --  Structure to keep the preprocessing data for a file name or for the
  80    --  default (when Name_Id = No_Name).
  81
  82    No_Preproc_Data : constant Preproc_Data :=
  83      (Mapping      => No_Mapping,
  84       File_Name    => No_File,
  85       Deffile      => No_String,
  86       Undef_False  => False,
  87       Always_Blank => False,
  88       Comments     => False,
  89       List_Symbols => False,
  90       Processed    => False);
  91
  92    Default_Data : Preproc_Data := No_Preproc_Data;
  93    --  The preprocessing data to be used when no specific preprocessing data
  94    --  is specified for a source.
  95
  96    Default_Data_Defined : Boolean := False;
  97    --  True if source for which no specific preprocessing is specified need to
  98    --  be preprocess with the Default_Data.
  99
 100    Current_Data : Preproc_Data := No_Preproc_Data;
 101
 102    package Preproc_Data_Table is new Table.Table
 103      (Table_Component_Type => Preproc_Data,
 104       Table_Index_Type     => Int,
 105       Table_Low_Bound      => 1,
 106       Table_Initial        => 5,
 107       Table_Increment      => 100,
 108       Table_Name           => "Prepcomp.Preproc_Data_Table");
 109    --  Table to store the specific preprocessing data
 110
 111    Command_Line_Symbols : Symbol_Table.Instance;
 112    --  A table to store symbol definitions specified on the command line with
 113    --  -gnateD switches.
 114
 115    package Dependencies is new Table.Table
 116      (Table_Component_Type => Source_File_Index,
 117       Table_Index_Type     => Int,
 118       Table_Low_Bound      => 1,
 119       Table_Initial        => 10,
 120       Table_Increment      => 100,
 121       Table_Name           => "Prepcomp.Dependencies");
 122    --  Table to store the dependencies on preprocessing files
 123
 124    procedure Add_Command_Line_Symbols;
 125    --  Add the command line symbol definitions, if any, to the
 126    --  Prep.Mapping table.
 127
 128    procedure Skip_To_End_Of_Line;
 129    --  Ignore errors and scan up to the next end of line or the end of file
 130
 131    ------------------------------
 132    -- Add_Command_Line_Symbols --
 133    ------------------------------
 134
 135    procedure Add_Command_Line_Symbols is
 136       Symbol_Id : Prep.Symbol_Id;
 137
 138    begin
 139       for J in 1 .. Symbol_Table.Last (Command_Line_Symbols) loop
 140          Symbol_Id := Prep.Index_Of (Command_Line_Symbols.Table (J).Symbol);
 141
 142          if Symbol_Id = No_Symbol then
 143             Symbol_Table.Increment_Last (Prep.Mapping);
 144             Symbol_Id := Symbol_Table.Last (Prep.Mapping);
 145          end if;
 146
 147          Prep.Mapping.Table (Symbol_Id) := Command_Line_Symbols.Table (J);
 148       end loop;
 149    end Add_Command_Line_Symbols;
 150
 151    ----------------------
 152    -- Add_Dependencies --
 153    ----------------------
 154
 155    procedure Add_Dependencies is
 156    begin
 157       for Index in 1 .. Dependencies.Last loop
 158          Add_Preprocessing_Dependency (Dependencies.Table (Index));
 159       end loop;
 160    end Add_Dependencies;
 161
 162    ---------------------------
 163    -- Add_Symbol_Definition --
 164    ---------------------------
 165
 166    procedure Add_Symbol_Definition (Def : String) is
 167    begin
 168       --  If Symbol_Definitions is not large enough, double it
 169
 170       if Last_Definition = Symbol_Definitions'Last then
 171          declare
 172             New_Symbol_Definitions : constant String_Array_Ptr :=
 173               new String_Array (1 .. 2 * Last_Definition);
 174
 175          begin
 176             New_Symbol_Definitions (Symbol_Definitions'Range) :=
 177               Symbol_Definitions.all;
 178             Free (Symbol_Definitions);
 179             Symbol_Definitions := New_Symbol_Definitions;
 180          end;
 181       end if;
 182
 183       Last_Definition := Last_Definition + 1;
 184       Symbol_Definitions (Last_Definition) := new String'(Def);
 185    end Add_Symbol_Definition;
 186
 187    -------------------
 188    -- Check_Symbols --
 189    -------------------
 190
 191    procedure Check_Symbols is
 192    begin
 193       --  If there is at least one switch -gnateD specified
 194
 195       if Symbol_Table.Last (Command_Line_Symbols) >= 1 then
 196          Current_Data := No_Preproc_Data;
 197          No_Preprocessing := False;
 198          Current_Data.Processed := True;
 199
 200          --  Start with an empty, initialized mapping table; use Prep.Mapping,
 201          --  because Prep.Index_Of uses Prep.Mapping.
 202
 203          Prep.Mapping := No_Mapping;
 204          Symbol_Table.Init (Prep.Mapping);
 205
 206          --  Add the command line symbols
 207
 208          Add_Command_Line_Symbols;
 209
 210          --  Put the resulting Prep.Mapping in Current_Data, and immediately
 211          --  set Prep.Mapping to nil.
 212
 213          Current_Data.Mapping := Prep.Mapping;
 214          Prep.Mapping := No_Mapping;
 215
 216          --  Set the default data
 217
 218          Default_Data := Current_Data;
 219          Default_Data_Defined := True;
 220       end if;
 221    end Check_Symbols;
 222
 223    ------------------------------
 224    -- Parse_Preprocessing_Data --
 225    ------------------------------
 226
 227    procedure Parse_Preprocessing_Data_File (N : File_Name_Type) is
 228       OK            : Boolean := False;
 229       Dash_Location : Source_Ptr;
 230       Symbol_Data   : Prep.Symbol_Data;
 231       Symbol_Id     : Prep.Symbol_Id;
 232       T             : constant Nat := Total_Errors_Detected;
 233
 234    begin
 235       --  Load the preprocessing data file
 236
 237       Source_Index_Of_Preproc_Data_File := Load_Preprocessing_Data_File (N);
 238
 239       --  Fail if preprocessing data file cannot be found
 240
 241       if Source_Index_Of_Preproc_Data_File = No_Source_File then
 242          Get_Name_String (N);
 243          Fail ("preprocessing data file """,
 244                Name_Buffer (1 .. Name_Len),
 245                """ not found");
 246       end if;
 247
 248       --  Initialize the scanner and set its behavior for a processing data
 249       --  file
 250
 251       Scn.Scanner.Initialize_Scanner (Source_Index_Of_Preproc_Data_File);
 252       Scn.Scanner.Set_End_Of_Line_As_Token (True);
 253       Scn.Scanner.Reset_Special_Characters;
 254
 255       For_Each_Line : loop
 256          <<Scan_Line>>
 257          Scan;
 258
 259          exit For_Each_Line when Token = Tok_EOF;
 260
 261          if Token = Tok_End_Of_Line then
 262             goto Scan_Line;
 263          end if;
 264
 265          --  Line is not empty
 266
 267          OK := False;
 268          No_Preprocessing := False;
 269          Current_Data := No_Preproc_Data;
 270
 271          case Token is
 272             when Tok_Asterisk =>
 273
 274                --  Default data
 275
 276                if Default_Data_Defined then
 277                   Error_Msg
 278                     ("multiple default preprocessing data", Token_Ptr);
 279
 280                else
 281                   OK := True;
 282                   Default_Data_Defined := True;
 283                end if;
 284
 285             when Tok_String_Literal =>
 286
 287                --  Specific data
 288
 289                String_To_Name_Buffer (String_Literal_Id);
 290                Canonical_Case_File_Name (Name_Buffer (1 .. Name_Len));
 291                Current_Data.File_Name := Name_Find;
 292                OK := True;
 293
 294                for Index in 1 .. Preproc_Data_Table.Last loop
 295                   if Current_Data.File_Name =
 296                        Preproc_Data_Table.Table (Index).File_Name
 297                   then
 298                      Error_Msg_File_1 := Current_Data.File_Name;
 299                      Error_Msg
 300                        ("multiple preprocessing data for{", Token_Ptr);
 301                      OK := False;
 302                      exit;
 303                   end if;
 304                end loop;
 305
 306             when others =>
 307                Error_Msg ("`'*` or literal string expected", Token_Ptr);
 308          end case;
 309
 310          --  If there is a problem, skip the line
 311
 312          if not OK then
 313             Skip_To_End_Of_Line;
 314             goto Scan_Line;
 315          end if;
 316
 317          --  Scan past the * or the literal string
 318
 319          Scan;
 320
 321          --  A literal string in second position is a definition file
 322
 323          if Token = Tok_String_Literal then
 324             Current_Data.Deffile := String_Literal_Id;
 325             Current_Data.Processed := False;
 326             Scan;
 327
 328          else
 329             --  If there is no definition file, set Processed to True now
 330
 331             Current_Data.Processed := True;
 332          end if;
 333
 334          --  Start with an empty, initialized mapping table; use Prep.Mapping,
 335          --  because Prep.Index_Of uses Prep.Mapping.
 336
 337          Prep.Mapping := No_Mapping;
 338          Symbol_Table.Init (Prep.Mapping);
 339
 340          --  Check the switches that may follow
 341
 342          while Token /= Tok_End_Of_Line and then Token /= Tok_EOF loop
 343             if Token /= Tok_Minus then
 344                Error_Msg ("`'-` expected", Token_Ptr);
 345                Skip_To_End_Of_Line;
 346                goto Scan_Line;
 347             end if;
 348
 349             --  Keep the location of the '-' for possible error reporting
 350
 351             Dash_Location := Token_Ptr;
 352
 353             --  Scan past the '-'
 354
 355             Scan;
 356             OK := False;
 357             Change_Reserved_Keyword_To_Symbol;
 358
 359             --  An identifier (or a reserved word converted to an
 360             --  identifier) is expected and there must be no blank space
 361             --  between the '-' and the identifier.
 362
 363             if Token = Tok_Identifier
 364               and then Token_Ptr = Dash_Location + 1
 365             then
 366                Get_Name_String (Token_Name);
 367
 368                --  Check the character in the source, because the case is
 369                --  significant.
 370
 371                case Sinput.Source (Token_Ptr) is
 372                   when 'u' =>
 373
 374                      --  Undefined symbol are False
 375
 376                      if Name_Len = 1 then
 377                         Current_Data.Undef_False := True;
 378                         OK := True;
 379                      end if;
 380
 381                   when 'b' =>
 382
 383                      --  Blank lines
 384
 385                      if Name_Len = 1 then
 386                         Current_Data.Always_Blank := True;
 387                         OK := True;
 388                      end if;
 389
 390                   when 'c' =>
 391
 392                      --  Comment removed lines
 393
 394                      if Name_Len = 1 then
 395                         Current_Data.Comments := True;
 396                         OK := True;
 397                      end if;
 398
 399                   when 's' =>
 400
 401                      --  List symbols
 402
 403                      if Name_Len = 1 then
 404                         Current_Data.List_Symbols := True;
 405                         OK := True;
 406                      end if;
 407
 408                   when 'D' =>
 409
 410                      --  Symbol definition
 411
 412                      OK := Name_Len > 1;
 413
 414                      if OK then
 415
 416                         --  A symbol must be an Ada identifier; it cannot start
 417                         --  with an underline or a digit.
 418
 419                         if Name_Buffer (2) = '_'
 420                           or Name_Buffer (2) in '0' .. '9'
 421                         then
 422                            Error_Msg ("symbol expected", Token_Ptr + 1);
 423                            Skip_To_End_Of_Line;
 424                            goto Scan_Line;
 425                         end if;
 426
 427                         --  Get the name id of the symbol
 428
 429                         Symbol_Data.On_The_Command_Line := True;
 430                         Name_Buffer (1 .. Name_Len - 1) :=
 431                           Name_Buffer (2 .. Name_Len);
 432                         Name_Len := Name_Len - 1;
 433                         Symbol_Data.Symbol := Name_Find;
 434
 435                         if Name_Buffer (1 .. Name_Len) = "if"
 436                           or else Name_Buffer (1 .. Name_Len) = "else"
 437                           or else Name_Buffer (1 .. Name_Len) = "elsif"
 438                           or else Name_Buffer (1 .. Name_Len) = "end"
 439                           or else Name_Buffer (1 .. Name_Len) = "not"
 440                           or else Name_Buffer (1 .. Name_Len) = "and"
 441                           or else Name_Buffer (1 .. Name_Len) = "then"
 442                         then
 443                            Error_Msg ("symbol expected", Token_Ptr + 1);
 444                            Skip_To_End_Of_Line;
 445                            goto Scan_Line;
 446                         end if;
 447
 448                         --  Get the name id of the original symbol, with
 449                         --  possibly capital letters.
 450
 451                         Name_Len := Integer (Scan_Ptr - Token_Ptr - 1);
 452
 453                         for J in 1 .. Name_Len loop
 454                            Name_Buffer (J) :=
 455                              Sinput.Source (Token_Ptr + Text_Ptr (J));
 456                         end loop;
 457
 458                         Symbol_Data.Original := Name_Find;
 459
 460                         --  Scan past D<symbol>
 461
 462                         Scan;
 463
 464                         if Token /= Tok_Equal then
 465                            Error_Msg ("`=` expected", Token_Ptr);
 466                            Skip_To_End_Of_Line;
 467                            goto Scan_Line;
 468                         end if;
 469
 470                         --  Scan past '='
 471
 472                         Scan;
 473
 474                         --  Here any reserved word is OK
 475
 476                         Change_Reserved_Keyword_To_Symbol
 477                           (All_Keywords => True);
 478
 479                         --  Value can be an identifier (or a reserved word)
 480                         --  or a literal string.
 481
 482                         case Token is
 483                            when Tok_String_Literal =>
 484                               Symbol_Data.Is_A_String := True;
 485                               Symbol_Data.Value := String_Literal_Id;
 486
 487                            when Tok_Identifier =>
 488                               Symbol_Data.Is_A_String := False;
 489                               Start_String;
 490
 491                               for J in Token_Ptr .. Scan_Ptr - 1 loop
 492                                  Store_String_Char (Sinput.Source (J));
 493                               end loop;
 494
 495                               Symbol_Data.Value := End_String;
 496
 497                            when others =>
 498                               Error_Msg
 499                                 ("literal string or identifier expected",
 500                                  Token_Ptr);
 501                               Skip_To_End_Of_Line;
 502                               goto Scan_Line;
 503                         end case;
 504
 505                         --  If symbol already exists, replace old definition
 506                         --  by new one.
 507
 508                         Symbol_Id := Prep.Index_Of (Symbol_Data.Symbol);
 509
 510                         --  Otherwise, add a new entry in the table
 511
 512                         if Symbol_Id = No_Symbol then
 513                            Symbol_Table.Increment_Last (Prep.Mapping);
 514                            Symbol_Id := Symbol_Table.Last (Mapping);
 515                         end if;
 516
 517                         Prep.Mapping.Table (Symbol_Id) := Symbol_Data;
 518                      end if;
 519
 520                   when others =>
 521                      null;
 522                end case;
 523
 524                Scan;
 525             end if;
 526
 527             if not OK then
 528                Error_Msg ("invalid switch", Dash_Location);
 529                Skip_To_End_Of_Line;
 530                goto Scan_Line;
 531             end if;
 532          end loop;
 533
 534          --  Add the command line symbols, if any, possibly replacing symbols
 535          --  just defined.
 536
 537          Add_Command_Line_Symbols;
 538
 539          --  Put the resulting Prep.Mapping in Current_Data, and immediately
 540          --  set Prep.Mapping to nil.
 541
 542          Current_Data.Mapping := Prep.Mapping;
 543          Prep.Mapping := No_Mapping;
 544
 545          --  Record Current_Data
 546
 547          if Current_Data.File_Name = No_File then
 548             Default_Data := Current_Data;
 549
 550          else
 551             Preproc_Data_Table.Increment_Last;
 552             Preproc_Data_Table.Table (Preproc_Data_Table.Last) := Current_Data;
 553          end if;
 554
 555          Current_Data := No_Preproc_Data;
 556       end loop For_Each_Line;
 557
 558       Scn.Scanner.Set_End_Of_Line_As_Token (False);
 559
 560       --  Fail if there were errors in the preprocessing data file
 561
 562       if Total_Errors_Detected > T then
 563          Errout.Finalize (Last_Call => True);
 564          Errout.Output_Messages;
 565          Fail ("errors found in preprocessing data file """,
 566                Get_Name_String (N),
 567                """");
 568       end if;
 569
 570       --  Record the dependency on the preprocessor data file
 571
 572       Dependencies.Increment_Last;
 573       Dependencies.Table (Dependencies.Last) :=
 574         Source_Index_Of_Preproc_Data_File;
 575    end Parse_Preprocessing_Data_File;
 576
 577    ---------------------------
 578    -- Prepare_To_Preprocess --
 579    ---------------------------
 580
 581    procedure Prepare_To_Preprocess
 582      (Source               : File_Name_Type;
 583       Preprocessing_Needed : out Boolean)
 584    is
 585       Default : Boolean := False;
 586       Index   : Int := 0;
 587
 588    begin
 589       --  By default, preprocessing is not needed
 590
 591       Preprocessing_Needed := False;
 592
 593       if No_Preprocessing then
 594          return;
 595       end if;
 596
 597       --  First, look for preprocessing data specific to the current source
 598
 599       for J in 1 .. Preproc_Data_Table.Last loop
 600          if Preproc_Data_Table.Table (J).File_Name = Source then
 601             Index := J;
 602             Current_Data := Preproc_Data_Table.Table (J);
 603             exit;
 604          end if;
 605       end loop;
 606
 607       --  If no specific preprocessing data, then take the default
 608
 609       if Index = 0 then
 610          if Default_Data_Defined then
 611             Current_Data := Default_Data;
 612             Default := True;
 613
 614          else
 615             --  If no default, then nothing to do
 616
 617             return;
 618          end if;
 619       end if;
 620
 621       --  Set the preprocessing flags according to the preprocessing data
 622
 623       if Current_Data.Comments and then not Current_Data.Always_Blank then
 624          Comment_Deleted_Lines := True;
 625          Blank_Deleted_Lines   := False;
 626
 627       else
 628          Comment_Deleted_Lines := False;
 629          Blank_Deleted_Lines   := True;
 630       end if;
 631
 632       Undefined_Symbols_Are_False := Current_Data.Undef_False;
 633       List_Preprocessing_Symbols  := Current_Data.List_Symbols;
 634
 635       --  If not already done it, process the definition file
 636
 637       if Current_Data.Processed then
 638
 639          --  Set Prep.Mapping
 640
 641          Prep.Mapping := Current_Data.Mapping;
 642
 643       else
 644          --  First put the mapping in Prep.Mapping, because Prep.Parse_Def_File
 645          --  works on Prep.Mapping.
 646
 647          Prep.Mapping := Current_Data.Mapping;
 648
 649          String_To_Name_Buffer (Current_Data.Deffile);
 650
 651          declare
 652             N           : constant File_Name_Type    := Name_Find;
 653             Deffile     : constant Source_File_Index :=
 654                             Load_Definition_File (N);
 655             Add_Deffile : Boolean                    := True;
 656             T           : constant Nat               := Total_Errors_Detected;
 657
 658          begin
 659             if Deffile = No_Source_File then
 660                Fail ("definition file """,
 661                      Get_Name_String (N),
 662                      """ cannot be found");
 663             end if;
 664
 665             --  Initialize the preprocessor and set the characteristics of the
 666             --  scanner for a definition file.
 667
 668             Prep.Initialize
 669               (Error_Msg         => Errout.Error_Msg'Access,
 670                Scan              => Scn.Scanner.Scan'Access,
 671                Set_Ignore_Errors => Errout.Set_Ignore_Errors'Access,
 672                Put_Char          => null,
 673                New_EOL           => null);
 674
 675             Scn.Scanner.Set_End_Of_Line_As_Token (True);
 676             Scn.Scanner.Reset_Special_Characters;
 677
 678             --  Initialize the scanner and process the definition file
 679
 680             Scn.Scanner.Initialize_Scanner (Deffile);
 681             Prep.Parse_Def_File;
 682
 683             --  Reset the behaviour of the scanner to the default
 684
 685             Scn.Scanner.Set_End_Of_Line_As_Token (False);
 686
 687             --  Fail if errors were found while processing the definition file
 688
 689             if T /= Total_Errors_Detected then
 690                Errout.Finalize (Last_Call => True);
 691                Errout.Output_Messages;
 692                Fail ("errors found in definition file """,
 693                      Get_Name_String (N),
 694                      """");
 695             end if;
 696
 697             for Index in 1 .. Dependencies.Last loop
 698                if Dependencies.Table (Index) = Deffile then
 699                   Add_Deffile := False;
 700                   exit;
 701                end if;
 702             end loop;
 703
 704             if Add_Deffile then
 705                Dependencies.Increment_Last;
 706                Dependencies.Table (Dependencies.Last) := Deffile;
 707             end if;
 708          end;
 709
 710          --  Get back the mapping, indicate that the definition file is
 711          --  processed and store back the preprocessing data.
 712
 713          Current_Data.Mapping := Prep.Mapping;
 714          Current_Data.Processed := True;
 715
 716          if Default then
 717             Default_Data := Current_Data;
 718
 719          else
 720             Preproc_Data_Table.Table (Index) := Current_Data;
 721          end if;
 722       end if;
 723
 724       Preprocessing_Needed := True;
 725    end Prepare_To_Preprocess;
 726
 727    ---------------------------------------------
 728    -- Process_Command_Line_Symbol_Definitions --
 729    ---------------------------------------------
 730
 731    procedure Process_Command_Line_Symbol_Definitions is
 732       Symbol_Data : Prep.Symbol_Data;
 733       Found : Boolean := False;
 734
 735    begin
 736       Symbol_Table.Init (Command_Line_Symbols);
 737
 738       --  The command line definitions have been stored temporarily in
 739       --  array Symbol_Definitions.
 740
 741       for Index in 1 .. Last_Definition loop
 742          --  Check each symbol definition, fail immediately if syntax is not
 743          --  correct.
 744
 745          Check_Command_Line_Symbol_Definition
 746            (Definition => Symbol_Definitions (Index).all,
 747             Data => Symbol_Data);
 748          Found := False;
 749
 750          --  If there is already a definition for this symbol, replace the old
 751          --  definition by this one.
 752
 753          for J in 1 .. Symbol_Table.Last (Command_Line_Symbols) loop
 754             if Command_Line_Symbols.Table (J).Symbol = Symbol_Data.Symbol then
 755                Command_Line_Symbols.Table (J) := Symbol_Data;
 756                Found := True;
 757                exit;
 758             end if;
 759          end loop;
 760
 761          --  Otherwise, create a new entry in the table
 762
 763          if not Found then
 764             Symbol_Table.Increment_Last (Command_Line_Symbols);
 765             Command_Line_Symbols.Table
 766               (Symbol_Table.Last (Command_Line_Symbols)) := Symbol_Data;
 767          end if;
 768       end loop;
 769    end Process_Command_Line_Symbol_Definitions;
 770
 771    -------------------------
 772    -- Skip_To_End_Of_Line --
 773    -------------------------
 774
 775    procedure Skip_To_End_Of_Line is
 776    begin
 777       Set_Ignore_Errors (To => True);
 778
 779       while Token /= Tok_End_Of_Line and then Token /= Tok_EOF loop
 780          Scan;
 781       end loop;
 782
 783       Set_Ignore_Errors (To => False);
 784    end Skip_To_End_Of_Line;
 785
 786 end Prepcomp;