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) 1992-2006, 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,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, 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 Output;  use Output;
  43 with Sinfo;   use Sinfo;
  44 with Sinput;  use Sinput;
  45 with Stand;   use Stand;
  46 with Stringt; use Stringt;
  47 with Tree_IO; use Tree_IO;
  48 with Uname;   use Uname;
  49
  50 package body Lib is
  51
  52    Switch_Storing_Enabled : Boolean := True;
  53    --  Set to False by Disable_Switch_Storing
  54
  55    -----------------------
  56    -- Local Subprograms --
  57    -----------------------
  58
  59    type SEU_Result is (
  60       Yes_Before, -- S1 is in same extended unit as S2 and appears before it
  61       Yes_Same,   -- S1 is in same extended unit as S2, Slocs are the same
  62       Yes_After,  -- S1 is in same extended unit as S2, and appears after it
  63       No);        -- S2 is not in same extended unit as S2
  64
  65    function Check_Same_Extended_Unit (S1, S2 : Source_Ptr) return SEU_Result;
  66    --  Used by In_Same_Extended_Unit and Earlier_In_Extended_Unit. Returns
  67    --  value as described above.
  68
  69    function Get_Code_Or_Source_Unit
  70      (S                : Source_Ptr;
  71       Unwind_Instances : Boolean) return Unit_Number_Type;
  72    --  Common code for Get_Code_Unit (get unit of instantiation for location)
  73    --  and Get_Source_Unit (get unit of template for location).
  74
  75    --------------------------------------------
  76    -- Access Functions for Unit Table Fields --
  77    --------------------------------------------
  78
  79    function Cunit (U : Unit_Number_Type) return Node_Id is
  80    begin
  81       return Units.Table (U).Cunit;
  82    end Cunit;
  83
  84    function Cunit_Entity (U : Unit_Number_Type) return Entity_Id is
  85    begin
  86       return Units.Table (U).Cunit_Entity;
  87    end Cunit_Entity;
  88
  89    function Dependency_Num (U : Unit_Number_Type) return Nat is
  90    begin
  91       return Units.Table (U).Dependency_Num;
  92    end Dependency_Num;
  93
  94    function Dynamic_Elab (U : Unit_Number_Type) return Boolean is
  95    begin
  96       return Units.Table (U).Dynamic_Elab;
  97    end Dynamic_Elab;
  98
  99    function Error_Location (U : Unit_Number_Type) return Source_Ptr is
 100    begin
 101       return Units.Table (U).Error_Location;
 102    end Error_Location;
 103
 104    function Expected_Unit (U : Unit_Number_Type) return Unit_Name_Type is
 105    begin
 106       return Units.Table (U).Expected_Unit;
 107    end Expected_Unit;
 108
 109    function Fatal_Error (U : Unit_Number_Type) return Boolean is
 110    begin
 111       return Units.Table (U).Fatal_Error;
 112    end Fatal_Error;
 113
 114    function Generate_Code (U : Unit_Number_Type) return Boolean is
 115    begin
 116       return Units.Table (U).Generate_Code;
 117    end Generate_Code;
 118
 119    function Has_RACW (U : Unit_Number_Type) return Boolean is
 120    begin
 121       return Units.Table (U).Has_RACW;
 122    end Has_RACW;
 123
 124    function Ident_String (U : Unit_Number_Type) return Node_Id is
 125    begin
 126       return Units.Table (U).Ident_String;
 127    end Ident_String;
 128
 129    function Loading (U : Unit_Number_Type) return Boolean is
 130    begin
 131       return Units.Table (U).Loading;
 132    end Loading;
 133
 134    function Main_Priority (U : Unit_Number_Type) return Int is
 135    begin
 136       return Units.Table (U).Main_Priority;
 137    end Main_Priority;
 138
 139    function Munit_Index (U : Unit_Number_Type) return Nat is
 140    begin
 141       return Units.Table (U).Munit_Index;
 142    end Munit_Index;
 143
 144    function Source_Index (U : Unit_Number_Type) return Source_File_Index is
 145    begin
 146       return Units.Table (U).Source_Index;
 147    end Source_Index;
 148
 149    function Unit_File_Name (U : Unit_Number_Type) return File_Name_Type is
 150    begin
 151       return Units.Table (U).Unit_File_Name;
 152    end Unit_File_Name;
 153
 154    function Unit_Name (U : Unit_Number_Type) return Unit_Name_Type is
 155    begin
 156       return Units.Table (U).Unit_Name;
 157    end Unit_Name;
 158
 159    ------------------------------------------
 160    -- Subprograms to Set Unit Table Fields --
 161    ------------------------------------------
 162
 163    procedure Set_Cunit (U : Unit_Number_Type; N : Node_Id) is
 164    begin
 165       Units.Table (U).Cunit := N;
 166    end Set_Cunit;
 167
 168    procedure Set_Cunit_Entity (U : Unit_Number_Type; E : Entity_Id) is
 169    begin
 170       Units.Table (U).Cunit_Entity := E;
 171       Set_Is_Compilation_Unit (E);
 172    end Set_Cunit_Entity;
 173
 174    procedure Set_Dynamic_Elab (U : Unit_Number_Type; B : Boolean := True) is
 175    begin
 176       Units.Table (U).Dynamic_Elab := B;
 177    end Set_Dynamic_Elab;
 178
 179    procedure Set_Error_Location (U : Unit_Number_Type; W : Source_Ptr) is
 180    begin
 181       Units.Table (U).Error_Location := W;
 182    end Set_Error_Location;
 183
 184    procedure Set_Fatal_Error (U : Unit_Number_Type; B : Boolean := True) is
 185    begin
 186       Units.Table (U).Fatal_Error := B;
 187    end Set_Fatal_Error;
 188
 189    procedure Set_Generate_Code (U : Unit_Number_Type; B : Boolean := True) is
 190    begin
 191       Units.Table (U).Generate_Code := B;
 192    end Set_Generate_Code;
 193
 194    procedure Set_Has_RACW (U : Unit_Number_Type; B : Boolean := True) is
 195    begin
 196       Units.Table (U).Has_RACW := B;
 197    end Set_Has_RACW;
 198
 199    procedure Set_Ident_String (U : Unit_Number_Type; N : Node_Id) is
 200    begin
 201       Units.Table (U).Ident_String := N;
 202    end Set_Ident_String;
 203
 204    procedure Set_Loading (U : Unit_Number_Type; B : Boolean := True) is
 205    begin
 206       Units.Table (U).Loading := B;
 207    end Set_Loading;
 208
 209    procedure Set_Main_Priority (U : Unit_Number_Type; P : Int) is
 210    begin
 211       Units.Table (U).Main_Priority := P;
 212    end Set_Main_Priority;
 213
 214    procedure Set_Unit_Name (U : Unit_Number_Type; N : Unit_Name_Type) is
 215    begin
 216       Units.Table (U).Unit_Name := N;
 217    end Set_Unit_Name;
 218
 219    ------------------------------
 220    -- Check_Same_Extended_Unit --
 221    ------------------------------
 222
 223    function Check_Same_Extended_Unit (S1, S2 : Source_Ptr) return SEU_Result is
 224       Sloc1  : Source_Ptr;
 225       Sloc2  : Source_Ptr;
 226       Sind1  : Source_File_Index;
 227       Sind2  : Source_File_Index;
 228       Inst1  : Source_Ptr;
 229       Inst2  : Source_Ptr;
 230       Unum1  : Unit_Number_Type;
 231       Unum2  : Unit_Number_Type;
 232       Unit1  : Node_Id;
 233       Unit2  : Node_Id;
 234       Depth1 : Nat;
 235       Depth2 : Nat;
 236
 237    begin
 238       if S1 = No_Location or else S2 = No_Location then
 239          return No;
 240
 241       elsif S1 = Standard_Location then
 242          if S2 = Standard_Location then
 243             return Yes_Same;
 244          else
 245             return No;
 246          end if;
 247
 248       elsif S2 = Standard_Location then
 249          return No;
 250       end if;
 251
 252       Sloc1 := S1;
 253       Sloc2 := S2;
 254       Unum1 := Get_Code_Unit (Sloc1);
 255       Unum2 := Get_Code_Unit (Sloc2);
 256
 257       loop
 258          Sind1 := Get_Source_File_Index (Sloc1);
 259          Sind2 := Get_Source_File_Index (Sloc2);
 260
 261          if Sind1 = Sind2 then
 262             if Sloc1 < Sloc2 then
 263                return Yes_Before;
 264             elsif Sloc1 > Sloc2 then
 265                return Yes_After;
 266             else
 267                return Yes_Same;
 268             end if;
 269          end if;
 270
 271          --  OK, the two nodes are in separate source elements, but this is not
 272          --  decisive, because of the issue of subunits and instantiations.
 273
 274          --  First we deal with subunits, since if the subunit is in an
 275          --  instantiation, we know that the parent is in the corresponding
 276          --  instantiation, since that is the only way we can have a subunit
 277          --  that is part of an instantiation.
 278
 279          Unit1 := Unit (Cunit (Unum1));
 280          Unit2 := Unit (Cunit (Unum2));
 281
 282          if Nkind (Unit1) = N_Subunit
 283            and then Present (Corresponding_Stub (Unit1))
 284          then
 285             --  Both in subunits. They could have a common ancestor. If they
 286             --  do, then the deeper one must have a longer unit name. Replace
 287             --  the deeper one with its corresponding stub, in order to find
 288             --  nearest common ancestor, if any.
 289
 290             if Nkind (Unit2) = N_Subunit
 291               and then Present (Corresponding_Stub (Unit2))
 292             then
 293                if Length_Of_Name (Unit_Name (Unum1)) <
 294                   Length_Of_Name (Unit_Name (Unum2))
 295                then
 296                   Sloc2 := Sloc (Corresponding_Stub (Unit2));
 297                   Unum2 := Get_Source_Unit (Sloc2);
 298                   goto Continue;
 299
 300                else
 301                   Sloc1 := Sloc (Corresponding_Stub (Unit1));
 302                   Unum1 := Get_Source_Unit (Sloc1);
 303                   goto Continue;
 304                end if;
 305
 306             --  Nod1 in subunit, Nod2 not
 307
 308             else
 309                Sloc1 := Sloc (Corresponding_Stub (Unit1));
 310                Unum1 := Get_Source_Unit (Sloc1);
 311                goto Continue;
 312             end if;
 313
 314          --  Nod2 in subunit, Nod1 not
 315
 316          elsif Nkind (Unit2) = N_Subunit
 317            and then Present (Corresponding_Stub (Unit2))
 318          then
 319             Sloc2 := Sloc (Corresponding_Stub (Unit2));
 320             Unum2 := Get_Source_Unit (Sloc2);
 321             goto Continue;
 322          end if;
 323
 324          --  At this stage we know that neither is a subunit, so we deal
 325          --  with instantiations, since we culd have a common ancestor
 326
 327          Inst1 := Instantiation (Sind1);
 328          Inst2 := Instantiation (Sind2);
 329
 330          if Inst1 /= No_Location then
 331
 332             --  Both are instantiations
 333
 334             if Inst2 /= No_Location then
 335
 336                Depth1 := Instantiation_Depth (Sloc1);
 337                Depth2 := Instantiation_Depth (Sloc2);
 338
 339                if Depth1 < Depth2 then
 340                   Sloc2 := Inst2;
 341                   Unum2 := Get_Source_Unit (Sloc2);
 342                   goto Continue;
 343
 344                elsif Depth1 > Depth2 then
 345                   Sloc1 := Inst1;
 346                   Unum1 := Get_Source_Unit (Sloc1);
 347                   goto Continue;
 348
 349                else
 350                   Sloc1 := Inst1;
 351                   Sloc2 := Inst2;
 352                   Unum1 := Get_Source_Unit (Sloc1);
 353                   Unum2 := Get_Source_Unit (Sloc2);
 354                   goto Continue;
 355                end if;
 356
 357             --  Only first node is in instantiation
 358
 359             else
 360                Sloc1 := Inst1;
 361                Unum1 := Get_Source_Unit (Sloc1);
 362                goto Continue;
 363             end if;
 364
 365          --  Only second node is instantiation
 366
 367          elsif Inst2 /= No_Location then
 368             Sloc2 := Inst2;
 369             Unum2 := Get_Source_Unit (Sloc2);
 370             goto Continue;
 371          end if;
 372
 373          --  No instantiations involved, so we are not in the same unit
 374          --  However, there is one case still to check, namely the case
 375          --  where one location is in the spec, and the other in the
 376          --  corresponding body (the spec location is earlier).
 377
 378          if Nkind (Unit1) = N_Subprogram_Body
 379               or else
 380             Nkind (Unit1) = N_Package_Body
 381          then
 382             if Library_Unit (Cunit (Unum1)) = Cunit (Unum2) then
 383                return Yes_After;
 384             end if;
 385
 386          elsif Nkind (Unit2) = N_Subprogram_Body
 387                  or else
 388                Nkind (Unit2) = N_Package_Body
 389          then
 390             if Library_Unit (Cunit (Unum2)) = Cunit (Unum1) then
 391                return Yes_Before;
 392             end if;
 393          end if;
 394
 395          --  If that special case does not occur, then we are certain that
 396          --  the two locations are really in separate units.
 397
 398          return No;
 399
 400          <<Continue>>
 401             null;
 402       end loop;
 403    end Check_Same_Extended_Unit;
 404
 405    -------------------------------
 406    -- Compilation_Switches_Last --
 407    -------------------------------
 408
 409    function Compilation_Switches_Last return Nat is
 410    begin
 411       return Compilation_Switches.Last;
 412    end Compilation_Switches_Last;
 413
 414    procedure Disable_Switch_Storing is
 415    begin
 416       Switch_Storing_Enabled := False;
 417    end Disable_Switch_Storing;
 418
 419    ------------------------------
 420    -- Earlier_In_Extended_Unit --
 421    ------------------------------
 422
 423    function Earlier_In_Extended_Unit (S1, S2 : Source_Ptr) return Boolean is
 424    begin
 425       return Check_Same_Extended_Unit (S1, S2) = Yes_Before;
 426    end Earlier_In_Extended_Unit;
 427
 428    ----------------------------
 429    -- Entity_Is_In_Main_Unit --
 430    ----------------------------
 431
 432    function Entity_Is_In_Main_Unit (E : Entity_Id) return Boolean is
 433       S : Entity_Id;
 434
 435    begin
 436       S := Scope (E);
 437
 438       while S /= Standard_Standard loop
 439          if S = Main_Unit_Entity then
 440             return True;
 441          elsif Ekind (S) = E_Package and then Is_Child_Unit (S) then
 442             return False;
 443          else
 444             S := Scope (S);
 445          end if;
 446       end loop;
 447
 448       return False;
 449    end Entity_Is_In_Main_Unit;
 450
 451    ---------------------------------
 452    -- Generic_Separately_Compiled --
 453    ---------------------------------
 454
 455    function Generic_Separately_Compiled (E : Entity_Id) return Boolean is
 456    begin
 457       --  We do not generate object files for internal generics, because
 458       --  the only thing they would contain is the elaboration boolean, and
 459       --  we are careful to elaborate all predefined units first anyway, so
 460       --  this boolean is not needed.
 461
 462       if Is_Internal_File_Name
 463           (Fname => Unit_File_Name (Get_Source_Unit (E)),
 464            Renamings_Included => True)
 465       then
 466          return False;
 467
 468       --  All other generic units do generate object files
 469
 470       else
 471          return True;
 472       end if;
 473    end Generic_Separately_Compiled;
 474
 475    function Generic_Separately_Compiled
 476      (Sfile : File_Name_Type) return Boolean
 477    is
 478    begin
 479       --  Exactly the same as previous function, but works directly on a file
 480       --  name.
 481
 482       if Is_Internal_File_Name
 483           (Fname              => Sfile,
 484            Renamings_Included => True)
 485       then
 486          return False;
 487
 488       --  All other generic units do generate object files
 489
 490       else
 491          return True;
 492       end if;
 493    end Generic_Separately_Compiled;
 494
 495    -----------------------------
 496    -- Get_Code_Or_Source_Unit --
 497    -----------------------------
 498
 499    function Get_Code_Or_Source_Unit
 500      (S                : Source_Ptr;
 501       Unwind_Instances : Boolean) return Unit_Number_Type
 502    is
 503    begin
 504       --  Search table unless we have No_Location, which can happen if the
 505       --  relevant location has not been set yet. Happens for example when
 506       --  we obtain Sloc (Cunit (Main_Unit)) before it is set.
 507
 508       if S /= No_Location then
 509          declare
 510             Source_File : Source_File_Index;
 511             Source_Unit : Unit_Number_Type;
 512
 513          begin
 514             Source_File := Get_Source_File_Index (S);
 515
 516             if Unwind_Instances then
 517                while Template (Source_File) /= No_Source_File loop
 518                   Source_File := Template (Source_File);
 519                end loop;
 520             end if;
 521
 522             Source_Unit := Unit (Source_File);
 523
 524             if Source_Unit /= No_Unit then
 525                return Source_Unit;
 526             end if;
 527          end;
 528       end if;
 529
 530       --  If S was No_Location, or was not in the table, we must be in the main
 531       --  source unit (and the value has not been placed in the table yet),
 532       --  or in one of the configuration pragma files.
 533
 534       return Main_Unit;
 535    end Get_Code_Or_Source_Unit;
 536
 537    -------------------
 538    -- Get_Code_Unit --
 539    -------------------
 540
 541    function Get_Code_Unit (S : Source_Ptr) return Unit_Number_Type is
 542    begin
 543       return Get_Code_Or_Source_Unit (Top_Level_Location (S),
 544         Unwind_Instances => False);
 545    end Get_Code_Unit;
 546
 547    function Get_Code_Unit (N : Node_Or_Entity_Id) return Unit_Number_Type is
 548    begin
 549       return Get_Code_Unit (Sloc (N));
 550    end Get_Code_Unit;
 551
 552    ----------------------------
 553    -- Get_Compilation_Switch --
 554    ----------------------------
 555
 556    function Get_Compilation_Switch (N : Pos) return String_Ptr is
 557    begin
 558       if N <= Compilation_Switches.Last then
 559          return Compilation_Switches.Table (N);
 560
 561       else
 562          return null;
 563       end if;
 564    end Get_Compilation_Switch;
 565
 566    ----------------------------------
 567    -- Get_Cunit_Entity_Unit_Number --
 568    ----------------------------------
 569
 570    function Get_Cunit_Entity_Unit_Number
 571      (E : Entity_Id) return Unit_Number_Type
 572    is
 573    begin
 574       for U in Units.First .. Units.Last loop
 575          if Cunit_Entity (U) = E then
 576             return U;
 577          end if;
 578       end loop;
 579
 580       --  If not in the table, must be the main source unit, and we just
 581       --  have not got it put into the table yet.
 582
 583       return Main_Unit;
 584    end Get_Cunit_Entity_Unit_Number;
 585
 586    ---------------------------
 587    -- Get_Cunit_Unit_Number --
 588    ---------------------------
 589
 590    function Get_Cunit_Unit_Number (N : Node_Id) return Unit_Number_Type is
 591    begin
 592       for U in Units.First .. Units.Last loop
 593          if Cunit (U) = N then
 594             return U;
 595          end if;
 596       end loop;
 597
 598       --  If not in the table, must be the main source unit, and we just
 599       --  have not got it put into the table yet.
 600
 601       return Main_Unit;
 602    end Get_Cunit_Unit_Number;
 603
 604    ---------------------
 605    -- Get_Source_Unit --
 606    ---------------------
 607
 608    function Get_Source_Unit (S : Source_Ptr) return Unit_Number_Type is
 609    begin
 610       return Get_Code_Or_Source_Unit (S, Unwind_Instances => True);
 611    end Get_Source_Unit;
 612
 613    function Get_Source_Unit (N : Node_Or_Entity_Id) return Unit_Number_Type is
 614    begin
 615       return Get_Source_Unit (Sloc (N));
 616    end Get_Source_Unit;
 617
 618    --------------------------------
 619    -- In_Extended_Main_Code_Unit --
 620    --------------------------------
 621
 622    function In_Extended_Main_Code_Unit
 623      (N : Node_Or_Entity_Id) return Boolean
 624    is
 625    begin
 626       if Sloc (N) = Standard_Location then
 627          return True;
 628
 629       elsif Sloc (N) = No_Location then
 630          return False;
 631
 632       --  Special case Itypes to test the Sloc of the associated node. The
 633       --  reason we do this is for possible calls from gigi after -gnatD
 634       --  processing is complete in sprint. This processing updates the
 635       --  sloc fields of all nodes in the tree, but itypes are not in the
 636       --  tree so their slocs do not get updated.
 637
 638       elsif Nkind (N) = N_Defining_Identifier
 639         and then Is_Itype (N)
 640       then
 641          return In_Extended_Main_Code_Unit (Associated_Node_For_Itype (N));
 642
 643       --  Otherwise see if we are in the main unit
 644
 645       elsif Get_Code_Unit (Sloc (N)) = Get_Code_Unit (Cunit (Main_Unit)) then
 646          return True;
 647
 648       --  Node may be in spec (or subunit etc) of main unit
 649
 650       else
 651          return
 652            In_Same_Extended_Unit (N, Cunit (Main_Unit));
 653       end if;
 654    end In_Extended_Main_Code_Unit;
 655
 656    function In_Extended_Main_Code_Unit (Loc : Source_Ptr) return Boolean is
 657    begin
 658       if Loc = Standard_Location then
 659          return True;
 660
 661       elsif Loc = No_Location then
 662          return False;
 663
 664       --  Otherwise see if we are in the main unit
 665
 666       elsif Get_Code_Unit (Loc) = Get_Code_Unit (Cunit (Main_Unit)) then
 667          return True;
 668
 669       --  Location may be in spec (or subunit etc) of main unit
 670
 671       else
 672          return
 673            In_Same_Extended_Unit (Loc, Sloc (Cunit (Main_Unit)));
 674       end if;
 675    end In_Extended_Main_Code_Unit;
 676
 677    ----------------------------------
 678    -- In_Extended_Main_Source_Unit --
 679    ----------------------------------
 680
 681    function In_Extended_Main_Source_Unit
 682      (N : Node_Or_Entity_Id) return Boolean
 683    is
 684       Nloc : constant Source_Ptr := Sloc (N);
 685       Mloc : constant Source_Ptr := Sloc (Cunit (Main_Unit));
 686
 687    begin
 688       --  If Mloc is not set, it means we are still parsing the main unit,
 689       --  so everything so far is in the extended main source unit.
 690
 691       if Mloc = No_Location then
 692          return True;
 693
 694       --  Special value cases
 695
 696       elsif Nloc = Standard_Location then
 697          return True;
 698
 699       elsif Nloc = No_Location then
 700          return False;
 701
 702       --  Special case Itypes to test the Sloc of the associated node. The
 703       --  reason we do this is for possible calls from gigi after -gnatD
 704       --  processing is complete in sprint. This processing updates the
 705       --  sloc fields of all nodes in the tree, but itypes are not in the
 706       --  tree so their slocs do not get updated.
 707
 708       elsif Nkind (N) = N_Defining_Identifier
 709         and then Is_Itype (N)
 710       then
 711          return In_Extended_Main_Source_Unit (Associated_Node_For_Itype (N));
 712
 713       --  Otherwise compare original locations to see if in same unit
 714
 715       else
 716          return
 717            In_Same_Extended_Unit
 718              (Original_Location (Nloc), Original_Location (Mloc));
 719       end if;
 720    end In_Extended_Main_Source_Unit;
 721
 722    function In_Extended_Main_Source_Unit
 723      (Loc : Source_Ptr) return Boolean
 724    is
 725       Mloc : constant Source_Ptr := Sloc (Cunit (Main_Unit));
 726
 727    begin
 728       --  If Mloc is not set, it means we are still parsing the main unit,
 729       --  so everything so far is in the extended main source unit.
 730
 731       if Mloc = No_Location then
 732          return True;
 733
 734       --  Special value cases
 735
 736       elsif Loc = Standard_Location then
 737          return True;
 738
 739       elsif Loc = No_Location then
 740          return False;
 741
 742       --  Otherwise compare original locations to see if in same unit
 743
 744       else
 745          return
 746            In_Same_Extended_Unit
 747              (Original_Location (Loc), Original_Location (Mloc));
 748       end if;
 749    end In_Extended_Main_Source_Unit;
 750
 751    -----------------------
 752    -- In_Same_Code_Unit --
 753    -----------------------
 754
 755    function In_Same_Code_Unit (N1, N2 : Node_Or_Entity_Id) return Boolean is
 756       S1 : constant Source_Ptr := Sloc (N1);
 757       S2 : constant Source_Ptr := Sloc (N2);
 758
 759    begin
 760       if S1 = No_Location or else S2 = No_Location then
 761          return False;
 762
 763       elsif S1 = Standard_Location then
 764          return S2 = Standard_Location;
 765
 766       elsif S2 = Standard_Location then
 767          return False;
 768       end if;
 769
 770       return Get_Code_Unit (N1) = Get_Code_Unit (N2);
 771    end In_Same_Code_Unit;
 772
 773    ---------------------------
 774    -- In_Same_Extended_Unit --
 775    ---------------------------
 776
 777    function In_Same_Extended_Unit
 778      (N1, N2 : Node_Or_Entity_Id) return Boolean
 779    is
 780    begin
 781       return Check_Same_Extended_Unit (Sloc (N1), Sloc (N2)) /= No;
 782    end In_Same_Extended_Unit;
 783
 784    function In_Same_Extended_Unit (S1, S2 : Source_Ptr) return Boolean is
 785    begin
 786       return Check_Same_Extended_Unit (S1, S2) /= No;
 787    end In_Same_Extended_Unit;
 788
 789    -------------------------
 790    -- In_Same_Source_Unit --
 791    -------------------------
 792
 793    function In_Same_Source_Unit (N1, N2 : Node_Or_Entity_Id) return Boolean is
 794       S1 : constant Source_Ptr := Sloc (N1);
 795       S2 : constant Source_Ptr := Sloc (N2);
 796
 797    begin
 798       if S1 = No_Location or else S2 = No_Location then
 799          return False;
 800
 801       elsif S1 = Standard_Location then
 802          return S2 = Standard_Location;
 803
 804       elsif S2 = Standard_Location then
 805          return False;
 806       end if;
 807
 808       return Get_Source_Unit (N1) = Get_Source_Unit (N2);
 809    end In_Same_Source_Unit;
 810
 811    -----------------------------
 812    -- Increment_Serial_Number --
 813    -----------------------------
 814
 815    function Increment_Serial_Number return Nat is
 816       TSN : Int renames Units.Table (Current_Sem_Unit).Serial_Number;
 817    begin
 818       TSN := TSN + 1;
 819       return TSN;
 820    end Increment_Serial_Number;
 821
 822    ----------------
 823    -- Initialize --
 824    ----------------
 825
 826    procedure Initialize is
 827    begin
 828       Linker_Option_Lines.Init;
 829       Load_Stack.Init;
 830       Units.Init;
 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;