gcc/ada/sinput.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                               S I N P U T                                --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2005 Free Software Foundation, Inc.          --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  19 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  20 -- MA 02111-1307, USA.                                                      --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 pragma Style_Checks (All_Checks);
  35 --  Subprograms not all in alpha order
  36
  37 with Debug;    use Debug;
  38 with Namet;    use Namet;
  39 with Opt;      use Opt;
  40 with Output;   use Output;
  41 with Tree_IO;  use Tree_IO;
  42 with System;   use System;
  43 with Widechar; use Widechar;
  44
  45 with System.Memory;
  46
  47 with Unchecked_Conversion;
  48 with Unchecked_Deallocation;
  49
  50 package body Sinput is
  51
  52    use ASCII;
  53    --  Make control characters visible
  54
  55    First_Time_Around : Boolean := True;
  56
  57    --  Routines to support conversion between types Lines_Table_Ptr,
  58    --  Logical_Lines_Table_Ptr and System.Address.
  59
  60    pragma Warnings (Off);
  61    --  These unchecked conversions are aliasing safe, since they are never
  62    --  used to construct improperly aliased pointer values.
  63
  64    function To_Address is
  65      new Unchecked_Conversion (Lines_Table_Ptr, Address);
  66
  67    function To_Address is
  68      new Unchecked_Conversion (Logical_Lines_Table_Ptr, Address);
  69
  70    function To_Pointer is
  71      new Unchecked_Conversion (Address, Lines_Table_Ptr);
  72
  73    function To_Pointer is
  74      new Unchecked_Conversion (Address, Logical_Lines_Table_Ptr);
  75
  76    pragma Warnings (On);
  77
  78    ---------------------------
  79    -- Add_Line_Tables_Entry --
  80    ---------------------------
  81
  82    procedure Add_Line_Tables_Entry
  83      (S : in out Source_File_Record;
  84       P : Source_Ptr)
  85    is
  86       LL : Physical_Line_Number;
  87
  88    begin
  89       --  Reallocate the lines tables if necessary.
  90
  91       --  Note: the reason we do not use the normal Table package
  92       --  mechanism is that we have several of these tables. We could
  93       --  use the new GNAT.Dynamic_Tables package and that would probably
  94       --  be a good idea ???
  95
  96       if S.Last_Source_Line = S.Lines_Table_Max then
  97          Alloc_Line_Tables
  98            (S,
  99             Int (S.Last_Source_Line) *
 100               ((100 + Alloc.Lines_Increment) / 100));
 101
 102          if Debug_Flag_D then
 103             Write_Str ("--> Reallocating lines table, size = ");
 104             Write_Int (Int (S.Lines_Table_Max));
 105             Write_Eol;
 106          end if;
 107       end if;
 108
 109       S.Last_Source_Line := S.Last_Source_Line + 1;
 110       LL := S.Last_Source_Line;
 111
 112       S.Lines_Table (LL) := P;
 113
 114       --  Deal with setting new entry in logical lines table if one is
 115       --  present. Note that there is always space (because the call to
 116       --  Alloc_Line_Tables makes sure both tables are the same length),
 117
 118       if S.Logical_Lines_Table /= null then
 119
 120          --  We can always set the entry from the previous one, because
 121          --  the processing for a Source_Reference pragma ensures that
 122          --  at least one entry following the pragma is set up correctly.
 123
 124          S.Logical_Lines_Table (LL) := S.Logical_Lines_Table (LL - 1) + 1;
 125       end if;
 126    end Add_Line_Tables_Entry;
 127
 128    -----------------------
 129    -- Alloc_Line_Tables --
 130    -----------------------
 131
 132    procedure Alloc_Line_Tables
 133      (S       : in out Source_File_Record;
 134       New_Max : Nat)
 135    is
 136       subtype size_t is Memory.size_t;
 137
 138       New_Table : Lines_Table_Ptr;
 139
 140       New_Logical_Table : Logical_Lines_Table_Ptr;
 141
 142       New_Size : constant size_t :=
 143                    size_t (New_Max * Lines_Table_Type'Component_Size /
 144                                                              Storage_Unit);
 145
 146    begin
 147       if S.Lines_Table = null then
 148          New_Table := To_Pointer (Memory.Alloc (New_Size));
 149
 150       else
 151          New_Table :=
 152            To_Pointer (Memory.Realloc (To_Address (S.Lines_Table), New_Size));
 153       end if;
 154
 155       if New_Table = null then
 156          raise Storage_Error;
 157       else
 158          S.Lines_Table     := New_Table;
 159          S.Lines_Table_Max := Physical_Line_Number (New_Max);
 160       end if;
 161
 162       if S.Num_SRef_Pragmas /= 0 then
 163          if S.Logical_Lines_Table = null then
 164             New_Logical_Table := To_Pointer (Memory.Alloc (New_Size));
 165          else
 166             New_Logical_Table := To_Pointer
 167               (Memory.Realloc (To_Address (S.Logical_Lines_Table), New_Size));
 168          end if;
 169
 170          if New_Logical_Table = null then
 171             raise Storage_Error;
 172          else
 173             S.Logical_Lines_Table := New_Logical_Table;
 174          end if;
 175       end if;
 176    end Alloc_Line_Tables;
 177
 178    -----------------
 179    -- Backup_Line --
 180    -----------------
 181
 182    procedure Backup_Line (P : in out Source_Ptr) is
 183       Sindex : constant Source_File_Index := Get_Source_File_Index (P);
 184       Src    : constant Source_Buffer_Ptr :=
 185                  Source_File.Table (Sindex).Source_Text;
 186       Sfirst : constant Source_Ptr :=
 187                  Source_File.Table (Sindex).Source_First;
 188
 189    begin
 190       P := P - 1;
 191
 192       if P = Sfirst then
 193          return;
 194       end if;
 195
 196       if Src (P) = CR then
 197          if Src (P - 1) = LF then
 198             P := P - 1;
 199          end if;
 200
 201       else -- Src (P) = LF
 202          if Src (P - 1) = CR then
 203             P := P - 1;
 204          end if;
 205       end if;
 206
 207       --  Now find first character of the previous line
 208
 209       while P > Sfirst
 210         and then Src (P - 1) /= LF
 211         and then Src (P - 1) /= CR
 212       loop
 213          P := P - 1;
 214       end loop;
 215    end Backup_Line;
 216
 217    ---------------------------
 218    -- Build_Location_String --
 219    ---------------------------
 220
 221    procedure Build_Location_String (Loc : Source_Ptr) is
 222       Ptr : Source_Ptr;
 223
 224    begin
 225       Name_Len := 0;
 226
 227       --  Loop through instantiations
 228
 229       Ptr := Loc;
 230       loop
 231          Get_Name_String_And_Append
 232            (Reference_Name (Get_Source_File_Index (Ptr)));
 233          Add_Char_To_Name_Buffer (':');
 234          Add_Nat_To_Name_Buffer
 235            (Nat (Get_Logical_Line_Number (Ptr)));
 236
 237          Ptr := Instantiation_Location (Ptr);
 238          exit when Ptr = No_Location;
 239          Add_Str_To_Name_Buffer (" instantiated at ");
 240       end loop;
 241
 242       Name_Buffer (Name_Len + 1) := NUL;
 243       return;
 244    end Build_Location_String;
 245
 246    -----------------------
 247    -- Get_Column_Number --
 248    -----------------------
 249
 250    function Get_Column_Number (P : Source_Ptr) return Column_Number is
 251       S      : Source_Ptr;
 252       C      : Column_Number;
 253       Sindex : Source_File_Index;
 254       Src    : Source_Buffer_Ptr;
 255
 256    begin
 257       --  If the input source pointer is not a meaningful value then return
 258       --  at once with column number 1. This can happen for a file not found
 259       --  condition for a file loaded indirectly by RTE, and also perhaps on
 260       --  some unknown internal error conditions. In either case we certainly
 261       --  don't want to blow up.
 262
 263       if P < 1 then
 264          return 1;
 265
 266       else
 267          Sindex := Get_Source_File_Index (P);
 268          Src := Source_File.Table (Sindex).Source_Text;
 269          S := Line_Start (P);
 270          C := 1;
 271
 272          while S < P loop
 273             if Src (S) = HT then
 274                C := (C - 1) / 8 * 8 + (8 + 1);
 275             else
 276                C := C + 1;
 277             end if;
 278
 279             S := S + 1;
 280          end loop;
 281
 282          return C;
 283       end if;
 284    end Get_Column_Number;
 285
 286    -----------------------------
 287    -- Get_Logical_Line_Number --
 288    -----------------------------
 289
 290    function Get_Logical_Line_Number
 291      (P    : Source_Ptr)
 292       return Logical_Line_Number
 293    is
 294       SFR : Source_File_Record
 295               renames Source_File.Table (Get_Source_File_Index (P));
 296
 297       L : constant Physical_Line_Number := Get_Physical_Line_Number (P);
 298
 299    begin
 300       if SFR.Num_SRef_Pragmas = 0 then
 301          return Logical_Line_Number (L);
 302       else
 303          return SFR.Logical_Lines_Table (L);
 304       end if;
 305    end Get_Logical_Line_Number;
 306
 307    ------------------------------
 308    -- Get_Physical_Line_Number --
 309    ------------------------------
 310
 311    function Get_Physical_Line_Number
 312      (P    : Source_Ptr)
 313       return Physical_Line_Number
 314    is
 315       Sfile : Source_File_Index;
 316       Table : Lines_Table_Ptr;
 317       Lo    : Physical_Line_Number;
 318       Hi    : Physical_Line_Number;
 319       Mid   : Physical_Line_Number;
 320       Loc   : Source_Ptr;
 321
 322    begin
 323       --  If the input source pointer is not a meaningful value then return
 324       --  at once with line number 1. This can happen for a file not found
 325       --  condition for a file loaded indirectly by RTE, and also perhaps on
 326       --  some unknown internal error conditions. In either case we certainly
 327       --  don't want to blow up.
 328
 329       if P < 1 then
 330          return 1;
 331
 332       --  Otherwise we can do the binary search
 333
 334       else
 335          Sfile := Get_Source_File_Index (P);
 336          Loc   := P + Source_File.Table (Sfile).Sloc_Adjust;
 337          Table := Source_File.Table (Sfile).Lines_Table;
 338          Lo    := 1;
 339          Hi    := Source_File.Table (Sfile).Last_Source_Line;
 340
 341          loop
 342             Mid := (Lo + Hi) / 2;
 343
 344             if Loc < Table (Mid) then
 345                Hi := Mid - 1;
 346
 347             else -- Loc >= Table (Mid)
 348
 349                if Mid = Hi or else
 350                   Loc < Table (Mid + 1)
 351                then
 352                   return Mid;
 353                else
 354                   Lo := Mid + 1;
 355                end if;
 356
 357             end if;
 358
 359          end loop;
 360       end if;
 361    end Get_Physical_Line_Number;
 362
 363    ---------------------------
 364    -- Get_Source_File_Index --
 365    ---------------------------
 366
 367    Source_Cache_First : Source_Ptr := 1;
 368    Source_Cache_Last  : Source_Ptr := 0;
 369    --  Records the First and Last subscript values for the most recently
 370    --  referenced entry in the source table, to optimize the common case
 371    --  of repeated references to the same entry. The initial values force
 372    --  an initial search to set the cache value.
 373
 374    Source_Cache_Index : Source_File_Index := No_Source_File;
 375    --  Contains the index of the entry corresponding to Source_Cache
 376
 377    function Get_Source_File_Index
 378      (S    : Source_Ptr)
 379       return Source_File_Index
 380    is
 381    begin
 382       if S in Source_Cache_First .. Source_Cache_Last then
 383          return Source_Cache_Index;
 384
 385       else
 386          for J in Source_File_Index_Table (Int (S) / Chunk_Size)
 387                                                     .. Source_File.Last
 388          loop
 389             if S in Source_File.Table (J).Source_First ..
 390                     Source_File.Table (J).Source_Last
 391             then
 392                Source_Cache_Index := J;
 393                Source_Cache_First :=
 394                  Source_File.Table (Source_Cache_Index).Source_First;
 395                Source_Cache_Last :=
 396                  Source_File.Table (Source_Cache_Index).Source_Last;
 397                return Source_Cache_Index;
 398             end if;
 399          end loop;
 400       end if;
 401
 402       --  We must find a matching entry in the above loop!
 403
 404       raise Program_Error;
 405    end Get_Source_File_Index;
 406
 407    ----------------
 408    -- Initialize --
 409    ----------------
 410
 411    procedure Initialize is
 412    begin
 413       Source_Cache_First := 1;
 414       Source_Cache_Last  := 0;
 415       Source_Cache_Index := No_Source_File;
 416       Source_gnat_adc    := No_Source_File;
 417       First_Time_Around  := True;
 418
 419       Source_File.Init;
 420    end Initialize;
 421
 422    -------------------------
 423    -- Instantiation_Depth --
 424    -------------------------
 425
 426    function Instantiation_Depth (S : Source_Ptr) return Nat is
 427       Sind  : Source_File_Index;
 428       Sval  : Source_Ptr;
 429       Depth : Nat;
 430
 431    begin
 432       Sval := S;
 433       Depth := 0;
 434
 435       loop
 436          Sind := Get_Source_File_Index (Sval);
 437          Sval := Instantiation (Sind);
 438          exit when Sval = No_Location;
 439          Depth := Depth + 1;
 440       end loop;
 441
 442       return Depth;
 443    end Instantiation_Depth;
 444
 445    ----------------------------
 446    -- Instantiation_Location --
 447    ----------------------------
 448
 449    function Instantiation_Location (S : Source_Ptr) return Source_Ptr is
 450    begin
 451       return Instantiation (Get_Source_File_Index (S));
 452    end Instantiation_Location;
 453
 454    ----------------------
 455    -- Last_Source_File --
 456    ----------------------
 457
 458    function Last_Source_File return Source_File_Index is
 459    begin
 460       return Source_File.Last;
 461    end Last_Source_File;
 462
 463    ----------------
 464    -- Line_Start --
 465    ----------------
 466
 467    function Line_Start (P : Source_Ptr) return Source_Ptr is
 468       Sindex : constant Source_File_Index := Get_Source_File_Index (P);
 469       Src    : constant Source_Buffer_Ptr :=
 470                  Source_File.Table (Sindex).Source_Text;
 471       Sfirst : constant Source_Ptr :=
 472                  Source_File.Table (Sindex).Source_First;
 473       S      : Source_Ptr;
 474
 475    begin
 476       S := P;
 477
 478       while S > Sfirst
 479         and then Src (S - 1) /= CR
 480         and then Src (S - 1) /= LF
 481       loop
 482          S := S - 1;
 483       end loop;
 484
 485       return S;
 486    end Line_Start;
 487
 488    function Line_Start
 489      (L    : Physical_Line_Number;
 490       S    : Source_File_Index)
 491       return Source_Ptr
 492    is
 493    begin
 494       return Source_File.Table (S).Lines_Table (L);
 495    end Line_Start;
 496
 497    ----------
 498    -- Lock --
 499    ----------
 500
 501    procedure Lock is
 502    begin
 503       Source_File.Locked := True;
 504       Source_File.Release;
 505    end Lock;
 506
 507    ----------------------
 508    -- Num_Source_Files --
 509    ----------------------
 510
 511    function Num_Source_Files return Nat is
 512    begin
 513       return Int (Source_File.Last) - Int (Source_File.First) + 1;
 514    end Num_Source_Files;
 515
 516    ----------------------
 517    -- Num_Source_Lines --
 518    ----------------------
 519
 520    function Num_Source_Lines (S : Source_File_Index) return Nat is
 521    begin
 522       return Nat (Source_File.Table (S).Last_Source_Line);
 523    end Num_Source_Lines;
 524
 525    -----------------------
 526    -- Original_Location --
 527    -----------------------
 528
 529    function Original_Location (S : Source_Ptr) return Source_Ptr is
 530       Sindex : Source_File_Index;
 531       Tindex : Source_File_Index;
 532
 533    begin
 534       if S <= No_Location then
 535          return S;
 536
 537       else
 538          Sindex := Get_Source_File_Index (S);
 539
 540          if Instantiation (Sindex) = No_Location then
 541             return S;
 542
 543          else
 544             Tindex := Template (Sindex);
 545             while Instantiation (Tindex) /= No_Location loop
 546                Tindex := Template (Tindex);
 547             end loop;
 548
 549             return S - Source_First (Sindex) + Source_First (Tindex);
 550          end if;
 551       end if;
 552    end Original_Location;
 553
 554    -------------------------
 555    -- Physical_To_Logical --
 556    -------------------------
 557
 558    function Physical_To_Logical
 559      (Line : Physical_Line_Number;
 560       S    : Source_File_Index)
 561       return Logical_Line_Number
 562    is
 563       SFR : Source_File_Record renames Source_File.Table (S);
 564
 565    begin
 566       if SFR.Num_SRef_Pragmas = 0 then
 567          return Logical_Line_Number (Line);
 568       else
 569          return SFR.Logical_Lines_Table (Line);
 570       end if;
 571    end Physical_To_Logical;
 572
 573    --------------------------------
 574    -- Register_Source_Ref_Pragma --
 575    --------------------------------
 576
 577    procedure Register_Source_Ref_Pragma
 578      (File_Name          : Name_Id;
 579       Stripped_File_Name : Name_Id;
 580       Mapped_Line        : Nat;
 581       Line_After_Pragma  : Physical_Line_Number)
 582    is
 583       subtype size_t is Memory.size_t;
 584
 585       SFR : Source_File_Record renames Source_File.Table (Current_Source_File);
 586
 587       ML : Logical_Line_Number;
 588
 589    begin
 590       if File_Name /= No_Name then
 591          SFR.Reference_Name := Stripped_File_Name;
 592          SFR.Full_Ref_Name  := File_Name;
 593
 594          if not Debug_Generated_Code then
 595             SFR.Debug_Source_Name := Stripped_File_Name;
 596             SFR.Full_Debug_Name   := File_Name;
 597          end if;
 598
 599          SFR.Num_SRef_Pragmas := SFR.Num_SRef_Pragmas + 1;
 600       end if;
 601
 602       if SFR.Num_SRef_Pragmas = 1 then
 603          SFR.First_Mapped_Line := Logical_Line_Number (Mapped_Line);
 604       end if;
 605
 606       if SFR.Logical_Lines_Table = null then
 607          SFR.Logical_Lines_Table := To_Pointer
 608            (Memory.Alloc
 609              (size_t (SFR.Lines_Table_Max *
 610                         Logical_Lines_Table_Type'Component_Size /
 611                                                         Storage_Unit)));
 612       end if;
 613
 614       SFR.Logical_Lines_Table (Line_After_Pragma - 1) := No_Line_Number;
 615
 616       ML := Logical_Line_Number (Mapped_Line);
 617       for J in Line_After_Pragma .. SFR.Last_Source_Line loop
 618          SFR.Logical_Lines_Table (J) := ML;
 619          ML := ML + 1;
 620       end loop;
 621    end Register_Source_Ref_Pragma;
 622
 623    ---------------------------------
 624    -- Set_Source_File_Index_Table --
 625    ---------------------------------
 626
 627    procedure Set_Source_File_Index_Table (Xnew : Source_File_Index) is
 628       Ind : Int;
 629       SP  : Source_Ptr;
 630       SL  : constant Source_Ptr := Source_File.Table (Xnew).Source_Last;
 631
 632    begin
 633       SP  := (Source_File.Table (Xnew).Source_First + Chunk_Size - 1)
 634                                                     / Chunk_Size * Chunk_Size;
 635       Ind := Int (SP) / Chunk_Size;
 636
 637       while SP <= SL loop
 638          Source_File_Index_Table (Ind) := Xnew;
 639          SP := SP + Chunk_Size;
 640          Ind := Ind + 1;
 641       end loop;
 642    end Set_Source_File_Index_Table;
 643
 644    ---------------------------
 645    -- Skip_Line_Terminators --
 646    ---------------------------
 647
 648    procedure Skip_Line_Terminators
 649      (P        : in out Source_Ptr;
 650       Physical : out Boolean)
 651    is
 652       Chr : constant Character := Source (P);
 653
 654    begin
 655       if  Chr = CR then
 656          if Source (P + 1) = LF then
 657             P := P + 2;
 658          else
 659             P := P + 1;
 660          end if;
 661
 662       elsif Chr = LF then
 663          if Source (P) = CR then
 664             P := P + 2;
 665          else
 666             P := P + 1;
 667          end if;
 668
 669       elsif Chr = FF or else Chr = VT then
 670          P := P + 1;
 671          Physical := False;
 672          return;
 673
 674          --  Otherwise we have a wide character
 675
 676       else
 677          Skip_Wide (Source, P);
 678       end if;
 679
 680       --  Fall through in the physical line terminator case. First deal with
 681       --  making a possible entry into the lines table if one is needed.
 682
 683       --  Note: we are dealing with a real source file here, this cannot be
 684       --  the instantiation case, so we need not worry about Sloc adjustment.
 685
 686       declare
 687          S : Source_File_Record
 688                renames Source_File.Table (Current_Source_File);
 689
 690       begin
 691          Physical := True;
 692
 693          --  Make entry in lines table if not already made (in some scan backup
 694          --  cases, we will be rescanning previously scanned source, so the
 695          --  entry may have already been made on the previous forward scan).
 696
 697          if Source (P) /= EOF
 698            and then P > S.Lines_Table (S.Last_Source_Line)
 699          then
 700             Add_Line_Tables_Entry (S, P);
 701          end if;
 702       end;
 703    end Skip_Line_Terminators;
 704
 705    -------------------
 706    -- Source_Offset --
 707    -------------------
 708
 709    function Source_Offset (S : Source_Ptr) return Nat is
 710       Sindex : constant Source_File_Index := Get_Source_File_Index (S);
 711       Sfirst : constant Source_Ptr :=
 712                  Source_File.Table (Sindex).Source_First;
 713
 714    begin
 715       return Nat (S - Sfirst);
 716    end Source_Offset;
 717
 718    ------------------------
 719    -- Top_Level_Location --
 720    ------------------------
 721
 722    function Top_Level_Location (S : Source_Ptr) return Source_Ptr is
 723       Oldloc : Source_Ptr;
 724       Newloc : Source_Ptr;
 725
 726    begin
 727       Newloc := S;
 728       loop
 729          Oldloc := Newloc;
 730          Newloc := Instantiation_Location (Oldloc);
 731          exit when Newloc = No_Location;
 732       end loop;
 733
 734       return Oldloc;
 735    end Top_Level_Location;
 736
 737    ---------------
 738    -- Tree_Read --
 739    ---------------
 740
 741    procedure Tree_Read is
 742    begin
 743       --  First we must free any old source buffer pointers
 744
 745       if not First_Time_Around then
 746          for J in Source_File.First .. Source_File.Last loop
 747             declare
 748                S : Source_File_Record renames Source_File.Table (J);
 749
 750                procedure Free_Ptr is new Unchecked_Deallocation
 751                  (Big_Source_Buffer, Source_Buffer_Ptr);
 752
 753                pragma Warnings (Off);
 754                --  This unchecked conversion is aliasing safe, since it is not
 755                --  used to create improperly aliased pointer values.
 756
 757                function To_Source_Buffer_Ptr is new
 758                  Unchecked_Conversion (Address, Source_Buffer_Ptr);
 759
 760                pragma Warnings (On);
 761
 762                Tmp1 : Source_Buffer_Ptr;
 763
 764             begin
 765                if S.Instantiation /= No_Location then
 766                   null;
 767
 768                else
 769                   --  We have to recreate a proper pointer to the actual array
 770                   --  from the zero origin pointer stored in the source table.
 771
 772                   Tmp1 :=
 773                     To_Source_Buffer_Ptr
 774                       (S.Source_Text (S.Source_First)'Address);
 775                   Free_Ptr (Tmp1);
 776
 777                   --  Note: we are using free here, because we used malloc
 778                   --  or realloc directly to allocate the tables. That is
 779                   --  because we were playing the big array trick.
 780
 781                   if S.Lines_Table /= null then
 782                      Memory.Free (To_Address (S.Lines_Table));
 783                      S.Lines_Table := null;
 784                   end if;
 785
 786                   if S.Logical_Lines_Table /= null then
 787                      Memory.Free (To_Address (S.Logical_Lines_Table));
 788                      S.Logical_Lines_Table := null;
 789                   end if;
 790                end if;
 791             end;
 792          end loop;
 793       end if;
 794
 795       --  Reset source cache pointers to force new read
 796
 797       Source_Cache_First := 1;
 798       Source_Cache_Last  := 0;
 799
 800       --  Read in source file table
 801
 802       Source_File.Tree_Read;
 803
 804       --  The pointers we read in there for the source buffer and lines
 805       --  table pointers are junk. We now read in the actual data that
 806       --  is referenced by these two fields.
 807
 808       for J in Source_File.First .. Source_File.Last loop
 809          declare
 810             S : Source_File_Record renames Source_File.Table (J);
 811
 812          begin
 813             --  For the instantiation case, we do not read in any data. Instead
 814             --  we share the data for the generic template entry. Since the
 815             --  template always occurs first, we can safetly refer to its data.
 816
 817             if S.Instantiation /= No_Location then
 818                declare
 819                   ST : Source_File_Record renames
 820                          Source_File.Table (S.Template);
 821
 822                begin
 823                   --  The lines tables are copied from the template entry
 824
 825                   S.Lines_Table :=
 826                     Source_File.Table (S.Template).Lines_Table;
 827                   S.Logical_Lines_Table :=
 828                     Source_File.Table (S.Template).Logical_Lines_Table;
 829
 830                   --  In the case of the source table pointer, we share the
 831                   --  same data as the generic template, but the virtual origin
 832                   --  is adjusted. For example, if the first subscript of the
 833                   --  template is 100, and that of the instantiation is 200,
 834                   --  then the instantiation pointer is obtained by subtracting
 835                   --  100 from the template pointer.
 836
 837                   declare
 838                      pragma Suppress (All_Checks);
 839
 840                      pragma Warnings (Off);
 841                      --  This unchecked conversion is aliasing safe since it
 842                      --  not used to create improperly aliased pointer values.
 843
 844                      function To_Source_Buffer_Ptr is new
 845                        Unchecked_Conversion (Address, Source_Buffer_Ptr);
 846
 847                      pragma Warnings (On);
 848
 849                   begin
 850                      S.Source_Text :=
 851                        To_Source_Buffer_Ptr
 852                           (ST.Source_Text
 853                             (ST.Source_First - S.Source_First)'Address);
 854                   end;
 855                end;
 856
 857             --  Normal case (non-instantiation)
 858
 859             else
 860                First_Time_Around := False;
 861                S.Lines_Table := null;
 862                S.Logical_Lines_Table := null;
 863                Alloc_Line_Tables (S, Int (S.Last_Source_Line));
 864
 865                for J in 1 .. S.Last_Source_Line loop
 866                   Tree_Read_Int (Int (S.Lines_Table (J)));
 867                end loop;
 868
 869                if S.Num_SRef_Pragmas /= 0 then
 870                   for J in 1 .. S.Last_Source_Line loop
 871                      Tree_Read_Int (Int (S.Logical_Lines_Table (J)));
 872                   end loop;
 873                end if;
 874
 875                --  Allocate source buffer and read in the data and then set the
 876                --  virtual origin to point to the logical zero'th element. This
 877                --  address must be computed with subscript checks turned off.
 878
 879                declare
 880                   subtype B is Text_Buffer (S.Source_First .. S.Source_Last);
 881                   type Text_Buffer_Ptr is access B;
 882                   T : Text_Buffer_Ptr;
 883
 884                   pragma Suppress (All_Checks);
 885
 886                   pragma Warnings (Off);
 887                   --  This unchecked conversion is aliasing safe, since it is
 888                   --  never used to create improperly aliased pointer values.
 889
 890                   function To_Source_Buffer_Ptr is new
 891                     Unchecked_Conversion (Address, Source_Buffer_Ptr);
 892
 893                   pragma Warnings (On);
 894
 895                begin
 896                   T := new B;
 897
 898                   Tree_Read_Data (T (S.Source_First)'Address,
 899                      Int (S.Source_Last) - Int (S.Source_First) + 1);
 900
 901                   S.Source_Text := To_Source_Buffer_Ptr (T (0)'Address);
 902                end;
 903             end if;
 904          end;
 905
 906          Set_Source_File_Index_Table (J);
 907       end loop;
 908    end Tree_Read;
 909
 910    ----------------
 911    -- Tree_Write --
 912    ----------------
 913
 914    procedure Tree_Write is
 915    begin
 916       Source_File.Tree_Write;
 917
 918       --  The pointers we wrote out there for the source buffer and lines
 919       --  table pointers are junk, we now write out the actual data that
 920       --  is referenced by these two fields.
 921
 922       for J in Source_File.First .. Source_File.Last loop
 923          declare
 924             S : Source_File_Record renames Source_File.Table (J);
 925
 926          begin
 927             --  For instantiations, there is nothing to do, since the data is
 928             --  shared with the generic template. When the tree is read, the
 929             --  pointers must be set, but no extra data needs to be written.
 930
 931             if S.Instantiation /= No_Location then
 932                null;
 933
 934             --  For the normal case, write out the data of the tables
 935
 936             else
 937                --  Lines table
 938
 939                for J in 1 .. S.Last_Source_Line loop
 940                   Tree_Write_Int (Int (S.Lines_Table (J)));
 941                end loop;
 942
 943                --  Logical lines table if present
 944
 945                if S.Num_SRef_Pragmas /= 0 then
 946                   for J in 1 .. S.Last_Source_Line loop
 947                      Tree_Write_Int (Int (S.Logical_Lines_Table (J)));
 948                   end loop;
 949                end if;
 950
 951                --  Source buffer
 952
 953                Tree_Write_Data
 954                  (S.Source_Text (S.Source_First)'Address,
 955                    Int (S.Source_Last) - Int (S.Source_First) + 1);
 956             end if;
 957          end;
 958       end loop;
 959    end Tree_Write;
 960
 961    --------------------
 962    -- Write_Location --
 963    --------------------
 964
 965    procedure Write_Location (P : Source_Ptr) is
 966    begin
 967       if P = No_Location then
 968          Write_Str ("<no location>");
 969
 970       elsif P <= Standard_Location then
 971          Write_Str ("<standard location>");
 972
 973       else
 974          declare
 975             SI : constant Source_File_Index := Get_Source_File_Index (P);
 976
 977          begin
 978             Write_Name (Debug_Source_Name (SI));
 979             Write_Char (':');
 980             Write_Int (Int (Get_Logical_Line_Number (P)));
 981             Write_Char (':');
 982             Write_Int (Int (Get_Column_Number (P)));
 983
 984             if Instantiation (SI) /= No_Location then
 985                Write_Str (" [");
 986                Write_Location (Instantiation (SI));
 987                Write_Char (']');
 988             end if;
 989          end;
 990       end if;
 991    end Write_Location;
 992
 993    ----------------------
 994    -- Write_Time_Stamp --
 995    ----------------------
 996
 997    procedure Write_Time_Stamp (S : Source_File_Index) is
 998       T : constant Time_Stamp_Type := Time_Stamp (S);
 999       P : Natural;
1000
1001    begin
1002       if T (1) = '9' then
1003          Write_Str ("19");
1004          P := 0;
1005       else
1006          Write_Char (T (1));
1007          Write_Char (T (2));
1008          P := 2;
1009       end if;
1010
1011       Write_Char (T (P + 1));
1012       Write_Char (T (P + 2));
1013       Write_Char ('-');
1014
1015       Write_Char (T (P + 3));
1016       Write_Char (T (P + 4));
1017       Write_Char ('-');
1018
1019       Write_Char (T (P + 5));
1020       Write_Char (T (P + 6));
1021       Write_Char (' ');
1022
1023       Write_Char (T (P + 7));
1024       Write_Char (T (P + 8));
1025       Write_Char (':');
1026
1027       Write_Char (T (P + 9));
1028       Write_Char (T (P + 10));
1029       Write_Char (':');
1030
1031       Write_Char (T (P + 11));
1032       Write_Char (T (P + 12));
1033    end Write_Time_Stamp;
1034
1035    ----------------------------------------------
1036    -- Access Subprograms for Source File Table --
1037    ----------------------------------------------
1038
1039    function Debug_Source_Name (S : SFI) return File_Name_Type is
1040    begin
1041       return Source_File.Table (S).Debug_Source_Name;
1042    end Debug_Source_Name;
1043
1044    function File_Name (S : SFI) return File_Name_Type is
1045    begin
1046       return Source_File.Table (S).File_Name;
1047    end File_Name;
1048
1049    function File_Type (S : SFI) return Type_Of_File is
1050    begin
1051       return Source_File.Table (S).File_Type;
1052    end File_Type;
1053
1054    function First_Mapped_Line (S : SFI) return Logical_Line_Number is
1055    begin
1056       return Source_File.Table (S).First_Mapped_Line;
1057    end First_Mapped_Line;
1058
1059    function Full_Debug_Name (S : SFI) return File_Name_Type is
1060    begin
1061       return Source_File.Table (S).Full_Debug_Name;
1062    end Full_Debug_Name;
1063
1064    function Full_File_Name (S : SFI) return File_Name_Type is
1065    begin
1066       return Source_File.Table (S).Full_File_Name;
1067    end Full_File_Name;
1068
1069    function Full_Ref_Name (S : SFI) return File_Name_Type is
1070    begin
1071       return Source_File.Table (S).Full_Ref_Name;
1072    end Full_Ref_Name;
1073
1074    function Identifier_Casing (S : SFI) return Casing_Type is
1075    begin
1076       return Source_File.Table (S).Identifier_Casing;
1077    end Identifier_Casing;
1078
1079    function Inlined_Body (S : SFI) return Boolean is
1080    begin
1081       return Source_File.Table (S).Inlined_Body;
1082    end Inlined_Body;
1083
1084    function Instantiation (S : SFI) return Source_Ptr is
1085    begin
1086       return Source_File.Table (S).Instantiation;
1087    end Instantiation;
1088
1089    function Keyword_Casing (S : SFI) return Casing_Type is
1090    begin
1091       return Source_File.Table (S).Keyword_Casing;
1092    end Keyword_Casing;
1093
1094    function Last_Source_Line (S : SFI) return Physical_Line_Number is
1095    begin
1096       return Source_File.Table (S).Last_Source_Line;
1097    end Last_Source_Line;
1098
1099    function License (S : SFI) return License_Type is
1100    begin
1101       return Source_File.Table (S).License;
1102    end License;
1103
1104    function Num_SRef_Pragmas (S : SFI) return Nat is
1105    begin
1106       return Source_File.Table (S).Num_SRef_Pragmas;
1107    end Num_SRef_Pragmas;
1108
1109    function Reference_Name (S : SFI) return File_Name_Type is
1110    begin
1111       return Source_File.Table (S).Reference_Name;
1112    end Reference_Name;
1113
1114    function Source_Checksum (S : SFI) return Word is
1115    begin
1116       return Source_File.Table (S).Source_Checksum;
1117    end Source_Checksum;
1118
1119    function Source_First (S : SFI) return Source_Ptr is
1120    begin
1121       if S = Internal_Source_File then
1122          return Internal_Source'First;
1123       else
1124          return Source_File.Table (S).Source_First;
1125       end if;
1126    end Source_First;
1127
1128    function Source_Last (S : SFI) return Source_Ptr is
1129    begin
1130       if S = Internal_Source_File then
1131          return Internal_Source'Last;
1132       else
1133          return Source_File.Table (S).Source_Last;
1134       end if;
1135
1136    end Source_Last;
1137
1138    function Source_Text (S : SFI) return Source_Buffer_Ptr is
1139    begin
1140       if S = Internal_Source_File then
1141          return Internal_Source_Ptr;
1142       else
1143          return Source_File.Table (S).Source_Text;
1144       end if;
1145
1146    end Source_Text;
1147
1148    function Template (S : SFI) return SFI is
1149    begin
1150       return Source_File.Table (S).Template;
1151    end Template;
1152
1153    function Time_Stamp (S : SFI) return Time_Stamp_Type is
1154    begin
1155       return Source_File.Table (S).Time_Stamp;
1156    end Time_Stamp;
1157
1158    ------------------------------------------
1159    -- Set Procedures for Source File Table --
1160    ------------------------------------------
1161
1162    procedure Set_Identifier_Casing (S : SFI; C : Casing_Type) is
1163    begin
1164       Source_File.Table (S).Identifier_Casing := C;
1165    end Set_Identifier_Casing;
1166
1167    procedure Set_Keyword_Casing (S : SFI; C : Casing_Type) is
1168    begin
1169       Source_File.Table (S).Keyword_Casing := C;
1170    end Set_Keyword_Casing;
1171
1172    procedure Set_License (S : SFI; L : License_Type) is
1173    begin
1174       Source_File.Table (S).License := L;
1175    end Set_License;
1176
1177    ----------------------
1178    -- Trim_Lines_Table --
1179    ----------------------
1180
1181    procedure Trim_Lines_Table (S : Source_File_Index) is
1182       Max : constant Nat := Nat (Source_File.Table (S).Last_Source_Line);
1183
1184    begin
1185       --  Release allocated storage that is no longer needed
1186
1187       Source_File.Table (S).Lines_Table := To_Pointer
1188         (Memory.Realloc
1189           (To_Address (Source_File.Table (S).Lines_Table),
1190            Memory.size_t
1191             (Max * (Lines_Table_Type'Component_Size / System.Storage_Unit))));
1192       Source_File.Table (S).Lines_Table_Max := Physical_Line_Number (Max);
1193    end Trim_Lines_Table;
1194
1195    --------
1196    -- wl --
1197    --------
1198
1199    procedure wl (P : Source_Ptr) is
1200    begin
1201       Write_Location (P);
1202       Write_Eol;
1203    end wl;
1204
1205 end Sinput;