gcc/ada/lib.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                                  L I B                                   --
   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 -- 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 --  Subprogram ordering not enforced in this unit
  36 --  (because of some logical groupings).
  37
  38 with Atree;   use Atree;
  39 with Einfo;   use Einfo;
  40 with Fname;   use Fname;
  41 with Namet;   use Namet;
  42 with Namet;   use Namet;
  43 with Output;  use Output;
  44 with Sinfo;   use Sinfo;
  45 with Sinput;  use Sinput;
  46 with Stand;   use Stand;
  47 with Stringt; use Stringt;
  48 with Tree_IO; use Tree_IO;
  49 with Uname;   use Uname;
  50
  51 package body Lib is
  52
  53    Switch_Storing_Enabled : Boolean := True;
  54    --  Set to False by Disable_Switch_Storing
  55
  56    -----------------------
  57    -- Local Subprograms --
  58    -----------------------
  59
  60    type SEU_Result is (
  61       Yes_Before, -- S1 is in same extended unit as S2 and appears before it
  62       Yes_Same,   -- S1 is in same extended unit as S2, Slocs are the same
  63       Yes_After,  -- S1 is in same extended unit as S2, and appears after it
  64       No);        -- S2 is not in same extended unit as S2
  65
  66    function Check_Same_Extended_Unit (S1, S2 : Source_Ptr) return SEU_Result;
  67    --  Used by In_Same_Extended_Unit and Earlier_In_Extended_Unit. Returns
  68    --  value as described above.
  69
  70    --------------------------------------------
  71    -- Access Functions for Unit Table Fields --
  72    --------------------------------------------
  73
  74    function Cunit (U : Unit_Number_Type) return Node_Id is
  75    begin
  76       return Units.Table (U).Cunit;
  77    end Cunit;
  78
  79    function Cunit_Entity (U : Unit_Number_Type) return Entity_Id is
  80    begin
  81       return Units.Table (U).Cunit_Entity;
  82    end Cunit_Entity;
  83
  84    function Dependency_Num (U : Unit_Number_Type) return Nat is
  85    begin
  86       return Units.Table (U).Dependency_Num;
  87    end Dependency_Num;
  88
  89    function Dynamic_Elab (U : Unit_Number_Type) return Boolean is
  90    begin
  91       return Units.Table (U).Dynamic_Elab;
  92    end Dynamic_Elab;
  93
  94    function Error_Location (U : Unit_Number_Type) return Source_Ptr is
  95    begin
  96       return Units.Table (U).Error_Location;
  97    end Error_Location;
  98
  99    function Expected_Unit (U : Unit_Number_Type) return Unit_Name_Type is
 100    begin
 101       return Units.Table (U).Expected_Unit;
 102    end Expected_Unit;
 103
 104    function Fatal_Error (U : Unit_Number_Type) return Boolean is
 105    begin
 106       return Units.Table (U).Fatal_Error;
 107    end Fatal_Error;
 108
 109    function Generate_Code (U : Unit_Number_Type) return Boolean is
 110    begin
 111       return Units.Table (U).Generate_Code;
 112    end Generate_Code;
 113
 114    function Has_RACW (U : Unit_Number_Type) return Boolean is
 115    begin
 116       return Units.Table (U).Has_RACW;
 117    end Has_RACW;
 118
 119    function Ident_String (U : Unit_Number_Type) return Node_Id is
 120    begin
 121       return Units.Table (U).Ident_String;
 122    end Ident_String;
 123
 124    function Loading (U : Unit_Number_Type) return Boolean is
 125    begin
 126       return Units.Table (U).Loading;
 127    end Loading;
 128
 129    function Main_Priority (U : Unit_Number_Type) return Int is
 130    begin
 131       return Units.Table (U).Main_Priority;
 132    end Main_Priority;
 133
 134    function Munit_Index (U : Unit_Number_Type) return Nat is
 135    begin
 136       return Units.Table (U).Munit_Index;
 137    end Munit_Index;
 138
 139    function Source_Index (U : Unit_Number_Type) return Source_File_Index is
 140    begin
 141       return Units.Table (U).Source_Index;
 142    end Source_Index;
 143
 144    function Unit_File_Name (U : Unit_Number_Type) return File_Name_Type is
 145    begin
 146       return Units.Table (U).Unit_File_Name;
 147    end Unit_File_Name;
 148
 149    function Unit_Name (U : Unit_Number_Type) return Unit_Name_Type is
 150    begin
 151       return Units.Table (U).Unit_Name;
 152    end Unit_Name;
 153
 154    ------------------------------------------
 155    -- Subprograms to Set Unit Table Fields --
 156    ------------------------------------------
 157
 158    procedure Set_Cunit (U : Unit_Number_Type; N : Node_Id) is
 159    begin
 160       Units.Table (U).Cunit := N;
 161    end Set_Cunit;
 162
 163    procedure Set_Cunit_Entity (U : Unit_Number_Type; E : Entity_Id) is
 164    begin
 165       Units.Table (U).Cunit_Entity := E;
 166       Set_Is_Compilation_Unit (E);
 167    end Set_Cunit_Entity;
 168
 169    procedure Set_Dynamic_Elab (U : Unit_Number_Type; B : Boolean := True) is
 170    begin
 171       Units.Table (U).Dynamic_Elab := B;
 172    end Set_Dynamic_Elab;
 173
 174    procedure Set_Error_Location (U : Unit_Number_Type; W : Source_Ptr) is
 175    begin
 176       Units.Table (U).Error_Location := W;
 177    end Set_Error_Location;
 178
 179    procedure Set_Fatal_Error (U : Unit_Number_Type; B : Boolean := True) is
 180    begin
 181       Units.Table (U).Fatal_Error := B;
 182    end Set_Fatal_Error;
 183
 184    procedure Set_Generate_Code (U : Unit_Number_Type; B : Boolean := True) is
 185    begin
 186       Units.Table (U).Generate_Code := B;
 187    end Set_Generate_Code;
 188
 189    procedure Set_Has_RACW (U : Unit_Number_Type; B : Boolean := True) is
 190    begin
 191       Units.Table (U).Has_RACW := B;
 192    end Set_Has_RACW;
 193
 194    procedure Set_Ident_String (U : Unit_Number_Type; N : Node_Id) is
 195    begin
 196       Units.Table (U).Ident_String := N;
 197    end Set_Ident_String;
 198
 199    procedure Set_Loading (U : Unit_Number_Type; B : Boolean := True) is
 200    begin
 201       Units.Table (U).Loading := B;
 202    end Set_Loading;
 203
 204    procedure Set_Main_Priority (U : Unit_Number_Type; P : Int) is
 205    begin
 206       Units.Table (U).Main_Priority := P;
 207    end Set_Main_Priority;
 208
 209    procedure Set_Unit_Name (U : Unit_Number_Type; N : Unit_Name_Type) is
 210    begin
 211       Units.Table (U).Unit_Name := N;
 212    end Set_Unit_Name;
 213
 214    ------------------------------
 215    -- Check_Same_Extended_Unit --
 216    ------------------------------
 217
 218    function Check_Same_Extended_Unit (S1, S2 : Source_Ptr) return SEU_Result is
 219       Sloc1  : Source_Ptr;
 220       Sloc2  : Source_Ptr;
 221       Sind1  : Source_File_Index;
 222       Sind2  : Source_File_Index;
 223       Inst1  : Source_Ptr;
 224       Inst2  : Source_Ptr;
 225       Unum1  : Unit_Number_Type;
 226       Unum2  : Unit_Number_Type;
 227       Unit1  : Node_Id;
 228       Unit2  : Node_Id;
 229       Depth1 : Nat;
 230       Depth2 : Nat;
 231
 232    begin
 233       if S1 = No_Location or else S2 = No_Location then
 234          return No;
 235
 236       elsif S1 = Standard_Location then
 237          if S2 = Standard_Location then
 238             return Yes_Same;
 239          else
 240             return No;
 241          end if;
 242
 243       elsif S2 = Standard_Location then
 244          return No;
 245       end if;
 246
 247       Sloc1 := S1;
 248       Sloc2 := S2;
 249       Unum1 := Get_Code_Unit (Sloc1);
 250       Unum2 := Get_Code_Unit (Sloc2);
 251
 252       loop
 253          Sind1 := Get_Source_File_Index (Sloc1);
 254          Sind2 := Get_Source_File_Index (Sloc2);
 255
 256          if Sind1 = Sind2 then
 257             if Sloc1 < Sloc2 then
 258                return Yes_Before;
 259             elsif Sloc1 > Sloc2 then
 260                return Yes_After;
 261             else
 262                return Yes_Same;
 263             end if;
 264          end if;
 265
 266          --  OK, the two nodes are in separate source elements, but this is not
 267          --  decisive, because of the issue of subunits and instantiations.
 268
 269          --  First we deal with subunits, since if the subunit is in an
 270          --  instantiation, we know that the parent is in the corresponding
 271          --  instantiation, since that is the only way we can have a subunit
 272          --  that is part of an instantiation.
 273
 274          Unit1 := Unit (Cunit (Unum1));
 275          Unit2 := Unit (Cunit (Unum2));
 276
 277          if Nkind (Unit1) = N_Subunit
 278            and then Present (Corresponding_Stub (Unit1))
 279          then
 280             --  Both in subunits. They could have a common ancestor. If they
 281             --  do, then the deeper one must have a longer unit name. Replace
 282             --  the deeper one with its corresponding stub, in order to find
 283             --  nearest common ancestor, if any.
 284
 285             if Nkind (Unit2) = N_Subunit
 286               and then Present (Corresponding_Stub (Unit2))
 287             then
 288                if Length_Of_Name (Unit_Name (Unum1)) <
 289                   Length_Of_Name (Unit_Name (Unum2))
 290                then
 291                   Sloc2 := Sloc (Corresponding_Stub (Unit2));
 292                   Unum2 := Get_Source_Unit (Sloc2);
 293                   goto Continue;
 294
 295                else
 296                   Sloc1 := Sloc (Corresponding_Stub (Unit1));
 297                   Unum1 := Get_Source_Unit (Sloc1);
 298                   goto Continue;
 299                end if;
 300
 301             --  Nod1 in subunit, Nod2 not
 302
 303             else
 304                Sloc1 := Sloc (Corresponding_Stub (Unit1));
 305                Unum1 := Get_Source_Unit (Sloc1);
 306                goto Continue;
 307             end if;
 308
 309          --  Nod2 in subunit, Nod1 not
 310
 311          elsif Nkind (Unit2) = N_Subunit
 312            and then Present (Corresponding_Stub (Unit2))
 313          then
 314             Sloc2 := Sloc (Corresponding_Stub (Unit2));
 315             Unum2 := Get_Source_Unit (Sloc2);
 316             goto Continue;
 317          end if;
 318
 319          --  At this stage we know that neither is a subunit, so we deal
 320          --  with instantiations, since we culd have a common ancestor
 321
 322          Inst1 := Instantiation (Sind1);
 323          Inst2 := Instantiation (Sind2);
 324
 325          if Inst1 /= No_Location then
 326
 327             --  Both are instantiations
 328
 329             if Inst2 /= No_Location then
 330
 331                Depth1 := Instantiation_Depth (Sloc1);
 332                Depth2 := Instantiation_Depth (Sloc2);
 333
 334                if Depth1 < Depth2 then
 335                   Sloc2 := Inst2;
 336                   Unum2 := Get_Source_Unit (Sloc2);
 337                   goto Continue;
 338
 339                elsif Depth1 > Depth2 then
 340                   Sloc1 := Inst1;
 341                   Unum1 := Get_Source_Unit (Sloc1);
 342                   goto Continue;
 343
 344                else
 345                   Sloc1 := Inst1;
 346                   Sloc2 := Inst2;
 347                   Unum1 := Get_Source_Unit (Sloc1);
 348                   Unum2 := Get_Source_Unit (Sloc2);
 349                   goto Continue;
 350                end if;
 351
 352             --  Only first node is in instantiation
 353
 354             else
 355                Sloc1 := Inst1;
 356                Unum1 := Get_Source_Unit (Sloc1);
 357                goto Continue;
 358             end if;
 359
 360          --  Only second node is instantiation
 361
 362          elsif Inst2 /= No_Location then
 363             Sloc2 := Inst2;
 364             Unum2 := Get_Source_Unit (Sloc2);
 365             goto Continue;
 366          end if;
 367
 368          --  No instantiations involved, so we are not in the same unit
 369          --  However, there is one case still to check, namely the case
 370          --  where one location is in the spec, and the other in the
 371          --  corresponding body (the spec location is earlier).
 372
 373          if Nkind (Unit1) = N_Subprogram_Body
 374               or else
 375             Nkind (Unit1) = N_Package_Body
 376          then
 377             if Library_Unit (Cunit (Unum1)) = Cunit (Unum2) then
 378                return Yes_After;
 379             end if;
 380
 381          elsif Nkind (Unit2) = N_Subprogram_Body
 382                  or else
 383                Nkind (Unit2) = N_Package_Body
 384          then
 385             if Library_Unit (Cunit (Unum2)) = Cunit (Unum1) then
 386                return Yes_Before;
 387             end if;
 388          end if;
 389
 390          --  If that special case does not occur, then we are certain that
 391          --  the two locations are really in separate units.
 392
 393          return No;
 394
 395          <<Continue>>
 396             null;
 397       end loop;
 398    end Check_Same_Extended_Unit;
 399
 400    -------------------------------
 401    -- Compilation_Switches_Last --
 402    -------------------------------
 403
 404    function Compilation_Switches_Last return Nat is
 405    begin
 406       return Compilation_Switches.Last;
 407    end Compilation_Switches_Last;
 408
 409    procedure Disable_Switch_Storing is
 410    begin
 411       Switch_Storing_Enabled := False;
 412    end Disable_Switch_Storing;
 413
 414    ------------------------------
 415    -- Earlier_In_Extended_Unit --
 416    ------------------------------
 417
 418    function Earlier_In_Extended_Unit (S1, S2 : Source_Ptr) return Boolean is
 419    begin
 420       return Check_Same_Extended_Unit (S1, S2) = Yes_Before;
 421    end Earlier_In_Extended_Unit;
 422
 423    ----------------------------
 424    -- Entity_Is_In_Main_Unit --
 425    ----------------------------
 426
 427    function Entity_Is_In_Main_Unit (E : Entity_Id) return Boolean is
 428       S : Entity_Id;
 429
 430    begin
 431       S := Scope (E);
 432
 433       while S /= Standard_Standard loop
 434          if S = Main_Unit_Entity then
 435             return True;
 436          elsif Ekind (S) = E_Package and then Is_Child_Unit (S) then
 437             return False;
 438          else
 439             S := Scope (S);
 440          end if;
 441       end loop;
 442
 443       return False;
 444    end Entity_Is_In_Main_Unit;
 445
 446    ---------------------------------
 447    -- Generic_Separately_Compiled --
 448    ---------------------------------
 449
 450    function Generic_Separately_Compiled (E : Entity_Id) return Boolean is
 451    begin
 452       --  We do not generate object files for internal generics, because
 453       --  the only thing they would contain is the elaboration boolean, and
 454       --  we are careful to elaborate all predefined units first anyway, so
 455       --  this boolean is not needed.
 456
 457       if Is_Internal_File_Name
 458           (Fname => Unit_File_Name (Get_Source_Unit (E)),
 459            Renamings_Included => True)
 460       then
 461          return False;
 462
 463       --  All other generic units do generate object files
 464
 465       else
 466          return True;
 467       end if;
 468    end Generic_Separately_Compiled;
 469
 470    function Generic_Separately_Compiled
 471      (Sfile : File_Name_Type) return Boolean
 472    is
 473    begin
 474       --  Exactly the same as previous function, but works directly on a file
 475       --  name.
 476
 477       if Is_Internal_File_Name
 478           (Fname              => Sfile,
 479            Renamings_Included => True)
 480       then
 481          return False;
 482
 483       --  All other generic units do generate object files
 484
 485       else
 486          return True;
 487       end if;
 488    end Generic_Separately_Compiled;
 489
 490    -------------------
 491    -- Get_Code_Unit --
 492    -------------------
 493
 494    function Get_Code_Unit (S : Source_Ptr) return Unit_Number_Type is
 495    begin
 496       --  Search table unless we have No_Location, which can happen if the
 497       --  relevant location has not been set yet. Happens for example when
 498       --  we obtain Sloc (Cunit (Main_Unit)) before it is set.
 499
 500       if S /= No_Location then
 501          declare
 502             Source_File : constant Source_File_Index :=
 503                             Get_Source_File_Index (Top_Level_Location (S));
 504
 505          begin
 506             for U in Units.First .. Units.Last loop
 507                if Source_Index (U) = Source_File then
 508                   return U;
 509                end if;
 510             end loop;
 511          end;
 512       end if;
 513
 514       --  If S was No_Location, or was not in the table, we must be in the
 515       --  main source unit (and the value has not been placed in the table yet)
 516
 517       return Main_Unit;
 518    end Get_Code_Unit;
 519
 520    function Get_Code_Unit (N : Node_Or_Entity_Id) return Unit_Number_Type is
 521    begin
 522       return Get_Code_Unit (Sloc (N));
 523    end Get_Code_Unit;
 524
 525    ----------------------------
 526    -- Get_Compilation_Switch --
 527    ----------------------------
 528
 529    function Get_Compilation_Switch (N : Pos) return String_Ptr is
 530    begin
 531       if N <= Compilation_Switches.Last then
 532          return Compilation_Switches.Table (N);
 533
 534       else
 535          return null;
 536       end if;
 537    end Get_Compilation_Switch;
 538
 539    ----------------------------------
 540    -- Get_Cunit_Entity_Unit_Number --
 541    ----------------------------------
 542
 543    function Get_Cunit_Entity_Unit_Number
 544      (E : Entity_Id) return Unit_Number_Type
 545    is
 546    begin
 547       for U in Units.First .. Units.Last loop
 548          if Cunit_Entity (U) = E then
 549             return U;
 550          end if;
 551       end loop;
 552
 553       --  If not in the table, must be the main source unit, and we just
 554       --  have not got it put into the table yet.
 555
 556       return Main_Unit;
 557    end Get_Cunit_Entity_Unit_Number;
 558
 559    ---------------------------
 560    -- Get_Cunit_Unit_Number --
 561    ---------------------------
 562
 563    function Get_Cunit_Unit_Number (N : Node_Id) return Unit_Number_Type is
 564    begin
 565       for U in Units.First .. Units.Last loop
 566          if Cunit (U) = N then
 567             return U;
 568          end if;
 569       end loop;
 570
 571       --  If not in the table, must be the main source unit, and we just
 572       --  have not got it put into the table yet.
 573
 574       return Main_Unit;
 575    end Get_Cunit_Unit_Number;
 576
 577    ---------------------
 578    -- Get_Source_Unit --
 579    ---------------------
 580
 581    function Get_Source_Unit (S : Source_Ptr) return Unit_Number_Type is
 582    begin
 583       --  Search table unless we have No_Location, which can happen if the
 584       --  relevant location has not been set yet. Happens for example when
 585       --  we obtain Sloc (Cunit (Main_Unit)) before it is set.
 586
 587       if S /= No_Location then
 588          declare
 589             Source_File : Source_File_Index :=
 590                             Get_Source_File_Index (Top_Level_Location (S));
 591
 592          begin
 593             Source_File := Get_Source_File_Index (S);
 594             while Template (Source_File) /= No_Source_File loop
 595                Source_File := Template (Source_File);
 596             end loop;
 597
 598             for U in Units.First .. Units.Last loop
 599                if Source_Index (U) = Source_File then
 600                   return U;
 601                end if;
 602             end loop;
 603          end;
 604       end if;
 605
 606       --  If S was No_Location, or was not in the table, we must be in the
 607       --  main source unit (and the value has not got put into the table yet)
 608
 609       return Main_Unit;
 610    end Get_Source_Unit;
 611
 612    function Get_Source_Unit (N : Node_Or_Entity_Id) return Unit_Number_Type is
 613    begin
 614       return Get_Source_Unit (Sloc (N));
 615    end Get_Source_Unit;
 616
 617    --------------------------------
 618    -- In_Extended_Main_Code_Unit --
 619    --------------------------------
 620
 621    function In_Extended_Main_Code_Unit
 622      (N : Node_Or_Entity_Id) return Boolean
 623    is
 624    begin
 625       if Sloc (N) = Standard_Location then
 626          return True;
 627
 628       elsif Sloc (N) = No_Location then
 629          return False;
 630
 631       --  Special case Itypes to test the Sloc of the associated node. The
 632       --  reason we do this is for possible calls from gigi after -gnatD
 633       --  processing is complete in sprint. This processing updates the
 634       --  sloc fields of all nodes in the tree, but itypes are not in the
 635       --  tree so their slocs do not get updated.
 636
 637       elsif Nkind (N) = N_Defining_Identifier
 638         and then Is_Itype (N)
 639       then
 640          return In_Extended_Main_Code_Unit (Associated_Node_For_Itype (N));
 641
 642       --  Otherwise see if we are in the main unit
 643
 644       elsif Get_Code_Unit (Sloc (N)) = Get_Code_Unit (Cunit (Main_Unit)) then
 645          return True;
 646
 647       --  Node may be in spec (or subunit etc) of main unit
 648
 649       else
 650          return
 651            In_Same_Extended_Unit (N, Cunit (Main_Unit));
 652       end if;
 653    end In_Extended_Main_Code_Unit;
 654
 655    function In_Extended_Main_Code_Unit (Loc : Source_Ptr) return Boolean is
 656    begin
 657       if Loc = Standard_Location then
 658          return True;
 659
 660       elsif Loc = No_Location then
 661          return False;
 662
 663       --  Otherwise see if we are in the main unit
 664
 665       elsif Get_Code_Unit (Loc) = Get_Code_Unit (Cunit (Main_Unit)) then
 666          return True;
 667
 668       --  Location may be in spec (or subunit etc) of main unit
 669
 670       else
 671          return
 672            In_Same_Extended_Unit (Loc, Sloc (Cunit (Main_Unit)));
 673       end if;
 674    end In_Extended_Main_Code_Unit;
 675
 676    ----------------------------------
 677    -- In_Extended_Main_Source_Unit --
 678    ----------------------------------
 679
 680    function In_Extended_Main_Source_Unit
 681      (N : Node_Or_Entity_Id) return Boolean
 682    is
 683       Nloc : constant Source_Ptr := Sloc (N);
 684       Mloc : constant Source_Ptr := Sloc (Cunit (Main_Unit));
 685
 686    begin
 687       --  If Mloc is not set, it means we are still parsing the main unit,
 688       --  so everything so far is in the extended main source unit.
 689
 690       if Mloc = No_Location then
 691          return True;
 692
 693       --  Special value cases
 694
 695       elsif Nloc = Standard_Location then
 696          return True;
 697
 698       elsif Nloc = No_Location then
 699          return False;
 700
 701       --  Special case Itypes to test the Sloc of the associated node. The
 702       --  reason we do this is for possible calls from gigi after -gnatD
 703       --  processing is complete in sprint. This processing updates the
 704       --  sloc fields of all nodes in the tree, but itypes are not in the
 705       --  tree so their slocs do not get updated.
 706
 707       elsif Nkind (N) = N_Defining_Identifier
 708         and then Is_Itype (N)
 709       then
 710          return In_Extended_Main_Source_Unit (Associated_Node_For_Itype (N));
 711
 712       --  Otherwise compare original locations to see if in same unit
 713
 714       else
 715          return
 716            In_Same_Extended_Unit
 717              (Original_Location (Nloc), Original_Location (Mloc));
 718       end if;
 719    end In_Extended_Main_Source_Unit;
 720
 721    function In_Extended_Main_Source_Unit
 722      (Loc : Source_Ptr) return Boolean
 723    is
 724       Mloc : constant Source_Ptr := Sloc (Cunit (Main_Unit));
 725
 726    begin
 727       --  If Mloc is not set, it means we are still parsing the main unit,
 728       --  so everything so far is in the extended main source unit.
 729
 730       if Mloc = No_Location then
 731          return True;
 732
 733       --  Special value cases
 734
 735       elsif Loc = Standard_Location then
 736          return True;
 737
 738       elsif Loc = No_Location then
 739          return False;
 740
 741       --  Otherwise compare original locations to see if in same unit
 742
 743       else
 744          return
 745            In_Same_Extended_Unit
 746              (Original_Location (Loc), Original_Location (Mloc));
 747       end if;
 748    end In_Extended_Main_Source_Unit;
 749
 750    -----------------------
 751    -- In_Same_Code_Unit --
 752    -----------------------
 753
 754    function In_Same_Code_Unit (N1, N2 : Node_Or_Entity_Id) return Boolean is
 755       S1 : constant Source_Ptr := Sloc (N1);
 756       S2 : constant Source_Ptr := Sloc (N2);
 757
 758    begin
 759       if S1 = No_Location or else S2 = No_Location then
 760          return False;
 761
 762       elsif S1 = Standard_Location then
 763          return S2 = Standard_Location;
 764
 765       elsif S2 = Standard_Location then
 766          return False;
 767       end if;
 768
 769       return Get_Code_Unit (N1) = Get_Code_Unit (N2);
 770    end In_Same_Code_Unit;
 771
 772    ---------------------------
 773    -- In_Same_Extended_Unit --
 774    ---------------------------
 775
 776    function In_Same_Extended_Unit
 777      (N1, N2 : Node_Or_Entity_Id) return Boolean
 778    is
 779    begin
 780       return Check_Same_Extended_Unit (Sloc (N1), Sloc (N2)) /= No;
 781    end In_Same_Extended_Unit;
 782
 783    function In_Same_Extended_Unit (S1, S2 : Source_Ptr) return Boolean is
 784    begin
 785       return Check_Same_Extended_Unit (S1, S2) /= No;
 786    end In_Same_Extended_Unit;
 787
 788    -------------------------
 789    -- In_Same_Source_Unit --
 790    -------------------------
 791
 792    function In_Same_Source_Unit (N1, N2 : Node_Or_Entity_Id) return Boolean is
 793       S1 : constant Source_Ptr := Sloc (N1);
 794       S2 : constant Source_Ptr := Sloc (N2);
 795
 796    begin
 797       if S1 = No_Location or else S2 = No_Location then
 798          return False;
 799
 800       elsif S1 = Standard_Location then
 801          return S2 = Standard_Location;
 802
 803       elsif S2 = Standard_Location then
 804          return False;
 805       end if;
 806
 807       return Get_Source_Unit (N1) = Get_Source_Unit (N2);
 808    end In_Same_Source_Unit;
 809
 810    -----------------------------
 811    -- Increment_Serial_Number --
 812    -----------------------------
 813
 814    function Increment_Serial_Number return Nat is
 815       TSN : Int renames Units.Table (Current_Sem_Unit).Serial_Number;
 816    begin
 817       TSN := TSN + 1;
 818       return TSN;
 819    end Increment_Serial_Number;
 820
 821    ----------------
 822    -- Initialize --
 823    ----------------
 824
 825    procedure Initialize is
 826    begin
 827       Linker_Option_Lines.Init;
 828       Load_Stack.Init;
 829       Units.Init;
 830       Unit_Exception_Table_Present := False;
 831       Compilation_Switches.Init;
 832    end Initialize;
 833
 834    ---------------
 835    -- Is_Loaded --
 836    ---------------
 837
 838    function Is_Loaded (Uname : Unit_Name_Type) return Boolean is
 839    begin
 840       for Unum in Units.First .. Units.Last loop
 841          if Uname = Unit_Name (Unum) then
 842             return True;
 843          end if;
 844       end loop;
 845
 846       return False;
 847    end Is_Loaded;
 848
 849    ---------------
 850    -- Last_Unit --
 851    ---------------
 852
 853    function Last_Unit return Unit_Number_Type is
 854    begin
 855       return Units.Last;
 856    end Last_Unit;
 857
 858    ----------
 859    -- List --
 860    ----------
 861
 862    procedure List (File_Names_Only : Boolean := False) is separate;
 863
 864    ----------
 865    -- Lock --
 866    ----------
 867
 868    procedure Lock is
 869    begin
 870       Linker_Option_Lines.Locked := True;
 871       Load_Stack.Locked := True;
 872       Units.Locked := True;
 873       Linker_Option_Lines.Release;
 874       Load_Stack.Release;
 875       Units.Release;
 876    end Lock;
 877
 878    ---------------
 879    -- Num_Units --
 880    ---------------
 881
 882    function Num_Units return Nat is
 883    begin
 884       return Int (Units.Last) - Int (Main_Unit) + 1;
 885    end Num_Units;
 886
 887    -----------------
 888    -- Remove_Unit --
 889    -----------------
 890
 891    procedure Remove_Unit (U : Unit_Number_Type) is
 892    begin
 893       if U = Units.Last then
 894          Units.Decrement_Last;
 895       end if;
 896    end Remove_Unit;
 897
 898    ----------------------------------
 899    -- Replace_Linker_Option_String --
 900    ----------------------------------
 901
 902    procedure Replace_Linker_Option_String
 903      (S : String_Id; Match_String : String)
 904    is
 905    begin
 906       if Match_String'Length > 0 then
 907          for J in 1 .. Linker_Option_Lines.Last loop
 908             String_To_Name_Buffer (Linker_Option_Lines.Table (J).Option);
 909
 910             if Match_String = Name_Buffer (1 .. Match_String'Length) then
 911                Linker_Option_Lines.Table (J).Option := S;
 912                return;
 913             end if;
 914          end loop;
 915       end if;
 916
 917       Store_Linker_Option_String (S);
 918    end Replace_Linker_Option_String;
 919
 920    ----------
 921    -- Sort --
 922    ----------
 923
 924    procedure Sort (Tbl : in out Unit_Ref_Table) is separate;
 925
 926    ------------------------------
 927    -- Store_Compilation_Switch --
 928    ------------------------------
 929
 930    procedure Store_Compilation_Switch (Switch : String) is
 931    begin
 932       if Switch_Storing_Enabled then
 933          Compilation_Switches.Increment_Last;
 934          Compilation_Switches.Table (Compilation_Switches.Last) :=
 935            new String'(Switch);
 936
 937          --  Fix up --RTS flag which has been transformed by the gcc driver
 938          --  into -fRTS
 939
 940          if Switch'Last >= Switch'First + 4
 941            and then Switch (Switch'First .. Switch'First + 4) = "-fRTS"
 942          then
 943             Compilation_Switches.Table
 944               (Compilation_Switches.Last) (Switch'First + 1) := '-';
 945          end if;
 946       end if;
 947    end Store_Compilation_Switch;
 948
 949    --------------------------------
 950    -- Store_Linker_Option_String --
 951    --------------------------------
 952
 953    procedure Store_Linker_Option_String (S : String_Id) is
 954    begin
 955       Linker_Option_Lines.Increment_Last;
 956       Linker_Option_Lines.Table (Linker_Option_Lines.Last) :=
 957         (Option => S, Unit => Current_Sem_Unit);
 958    end Store_Linker_Option_String;
 959
 960    -------------------------------
 961    -- Synchronize_Serial_Number --
 962    -------------------------------
 963
 964    procedure Synchronize_Serial_Number is
 965       TSN : Int renames Units.Table (Current_Sem_Unit).Serial_Number;
 966    begin
 967       TSN := TSN + 1;
 968    end Synchronize_Serial_Number;
 969
 970    ---------------
 971    -- Tree_Read --
 972    ---------------
 973
 974    procedure Tree_Read is
 975       N : Nat;
 976       S : String_Ptr;
 977
 978    begin
 979       Units.Tree_Read;
 980
 981       --  Read Compilation_Switches table
 982
 983       Tree_Read_Int (N);
 984       Compilation_Switches.Set_Last (N);
 985
 986       for J in 1 .. N loop
 987          Tree_Read_Str (S);
 988          Compilation_Switches.Table (J) := S;
 989       end loop;
 990    end Tree_Read;
 991
 992    ----------------
 993    -- Tree_Write --
 994    ----------------
 995
 996    procedure Tree_Write is
 997    begin
 998       Units.Tree_Write;
 999
1000       --  Write Compilation_Switches table
1001
1002       Tree_Write_Int (Compilation_Switches.Last);
1003
1004       for J in 1 .. Compilation_Switches.Last loop
1005          Tree_Write_Str (Compilation_Switches.Table (J));
1006       end loop;
1007    end Tree_Write;
1008
1009    -----------------
1010    -- Version_Get --
1011    -----------------
1012
1013    function Version_Get (U : Unit_Number_Type) return Word_Hex_String is
1014    begin
1015       return Get_Hex_String (Units.Table (U).Version);
1016    end Version_Get;
1017
1018    ------------------------
1019    -- Version_Referenced --
1020    ------------------------
1021
1022    procedure Version_Referenced (S : String_Id) is
1023    begin
1024       Version_Ref.Append (S);
1025    end Version_Referenced;
1026
1027 end Lib;