gcc/ada/par-ch12.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                             P A R . C H 1 2                              --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --                            $Revision: 1.46 $
  10 --                                                                          --
  11 --          Copyright (C) 1992-2001 Free Software Foundation, Inc.          --
  12 --                                                                          --
  13 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  14 -- terms of the  GNU General Public License as published  by the Free Soft- --
  15 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  16 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  17 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  18 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  19 -- for  more details.  You should have  received  a copy of the GNU General --
  20 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  21 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  22 -- MA 02111-1307, USA.                                                      --
  23 --                                                                          --
  24 -- GNAT was originally developed  by the GNAT team at  New York University. --
  25 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
  26 --                                                                          --
  27 ------------------------------------------------------------------------------
  28
  29 pragma Style_Checks (All_Checks);
  30 --  Turn off subprogram body ordering check. Subprograms are in order
  31 --  by RM section rather than alphabetical
  32
  33 separate (Par)
  34 package body Ch12 is
  35
  36    --  Local functions, used only in this chapter
  37
  38    function P_Formal_Derived_Type_Definition           return Node_Id;
  39    function P_Formal_Discrete_Type_Definition          return Node_Id;
  40    function P_Formal_Fixed_Point_Definition            return Node_Id;
  41    function P_Formal_Floating_Point_Definition         return Node_Id;
  42    function P_Formal_Modular_Type_Definition           return Node_Id;
  43    function P_Formal_Package_Declaration               return Node_Id;
  44    function P_Formal_Private_Type_Definition           return Node_Id;
  45    function P_Formal_Signed_Integer_Type_Definition    return Node_Id;
  46    function P_Formal_Subprogram_Declaration            return Node_Id;
  47    function P_Formal_Type_Declaration                  return Node_Id;
  48    function P_Formal_Type_Definition                   return Node_Id;
  49    function P_Generic_Association                      return Node_Id;
  50
  51    procedure P_Formal_Object_Declarations (Decls : List_Id);
  52    --  Scans one or more formal object declarations and appends them to
  53    --  Decls. Scans more than one declaration only in the case where the
  54    --  source has a declaration with multiple defining identifiers.
  55
  56    --------------------------------
  57    -- 12.1  Generic (also 8.5.5) --
  58    --------------------------------
  59
  60    --  This routine parses either one of the forms of a generic declaration
  61    --  or a generic renaming declaration.
  62
  63    --  GENERIC_DECLARATION ::=
  64    --    GENERIC_SUBPROGRAM_DECLARATION | GENERIC_PACKAGE_DECLARATION
  65
  66    --  GENERIC_SUBPROGRAM_DECLARATION ::=
  67    --    GENERIC_FORMAL_PART SUBPROGRAM_SPECIFICATION;
  68
  69    --  GENERIC_PACKAGE_DECLARATION ::=
  70    --    GENERIC_FORMAL_PART PACKAGE_SPECIFICATION;
  71
  72    --  GENERIC_FORMAL_PART ::=
  73    --    generic {GENERIC_FORMAL_PARAMETER_DECLARATION | USE_CLAUSE}
  74
  75    --  GENERIC_RENAMING_DECLARATION ::=
  76    --    generic package DEFINING_PROGRAM_UNIT_NAME
  77    --      renames generic_package_NAME
  78    --  | generic procedure DEFINING_PROGRAM_UNIT_NAME
  79    --      renames generic_procedure_NAME
  80    --  | generic function DEFINING_PROGRAM_UNIT_NAME
  81    --      renames generic_function_NAME
  82
  83    --  GENERIC_FORMAL_PARAMETER_DECLARATION ::=
  84    --    FORMAL_OBJECT_DECLARATION
  85    --  | FORMAL_TYPE_DECLARATION
  86    --  | FORMAL_SUBPROGRAM_DECLARATION
  87    --  | FORMAL_PACKAGE_DECLARATION
  88
  89    --  The caller has checked that the initial token is GENERIC
  90
  91    --  Error recovery: can raise Error_Resync
  92
  93    function P_Generic return Node_Id is
  94       Gen_Sloc   : constant Source_Ptr := Token_Ptr;
  95       Gen_Decl   : Node_Id;
  96       Decl_Node  : Node_Id;
  97       Decls      : List_Id;
  98       Def_Unit   : Node_Id;
  99       Ren_Token  : Token_Type;
 100       Scan_State : Saved_Scan_State;
 101
 102    begin
 103       Scan; -- past GENERIC
 104
 105       if Token = Tok_Private then
 106          Error_Msg_SC ("PRIVATE goes before GENERIC, not after");
 107          Scan; -- past junk PRIVATE token
 108       end if;
 109
 110       Save_Scan_State (Scan_State); -- at token past GENERIC
 111
 112       --  Check for generic renaming declaration case
 113
 114       if Token = Tok_Package
 115         or else Token = Tok_Function
 116         or else Token = Tok_Procedure
 117       then
 118          Ren_Token := Token;
 119          Scan; -- scan past PACKAGE, FUNCTION or PROCEDURE
 120
 121          if Token = Tok_Identifier then
 122             Def_Unit := P_Defining_Program_Unit_Name;
 123
 124             Check_Misspelling_Of (Tok_Renames);
 125
 126             if Token = Tok_Renames then
 127                if Ren_Token = Tok_Package then
 128                   Decl_Node := New_Node
 129                     (N_Generic_Package_Renaming_Declaration, Gen_Sloc);
 130
 131                elsif Ren_Token = Tok_Procedure then
 132                   Decl_Node := New_Node
 133                     (N_Generic_Procedure_Renaming_Declaration, Gen_Sloc);
 134
 135                else -- Ren_Token = Tok_Function then
 136                   Decl_Node := New_Node
 137                     (N_Generic_Function_Renaming_Declaration, Gen_Sloc);
 138                end if;
 139
 140                Scan; -- past RENAMES
 141                Set_Defining_Unit_Name (Decl_Node, Def_Unit);
 142                Set_Name (Decl_Node, P_Name);
 143                TF_Semicolon;
 144                return Decl_Node;
 145             end if;
 146          end if;
 147       end if;
 148
 149       --  Fall through if this is *not* a generic renaming declaration
 150
 151       Restore_Scan_State (Scan_State);
 152       Decls := New_List;
 153
 154       --  Loop through generic parameter declarations and use clauses
 155
 156       Decl_Loop : loop
 157          P_Pragmas_Opt (Decls);
 158          Ignore (Tok_Private);
 159
 160          if Token = Tok_Use then
 161             Append (P_Use_Clause, Decls);
 162          else
 163             --  Parse a generic parameter declaration
 164
 165             if Token = Tok_Identifier then
 166                P_Formal_Object_Declarations (Decls);
 167
 168             elsif Token = Tok_Type then
 169                Append (P_Formal_Type_Declaration, Decls);
 170
 171             elsif Token = Tok_With then
 172                Scan; -- past WITH
 173
 174                if Token = Tok_Package then
 175                   Append (P_Formal_Package_Declaration, Decls);
 176
 177                elsif Token = Tok_Procedure or Token = Tok_Function then
 178                   Append (P_Formal_Subprogram_Declaration, Decls);
 179
 180                else
 181                   Error_Msg_BC
 182                     ("FUNCTION, PROCEDURE or PACKAGE expected here");
 183                   Resync_Past_Semicolon;
 184                end if;
 185
 186             elsif Token = Tok_Subtype then
 187                Error_Msg_SC ("subtype declaration not allowed " &
 188                                 "as generic parameter declaration!");
 189                Resync_Past_Semicolon;
 190
 191             else
 192                exit Decl_Loop;
 193             end if;
 194          end if;
 195
 196       end loop Decl_Loop;
 197
 198       --  Generic formal part is scanned, scan out subprogram or package spec
 199
 200       if Token = Tok_Package then
 201          Gen_Decl := New_Node (N_Generic_Package_Declaration, Gen_Sloc);
 202          Set_Specification (Gen_Decl, P_Package (Pf_Spcn));
 203       else
 204          Gen_Decl := New_Node (N_Generic_Subprogram_Declaration, Gen_Sloc);
 205          Set_Specification (Gen_Decl, P_Subprogram_Specification);
 206          TF_Semicolon;
 207       end if;
 208
 209       Set_Generic_Formal_Declarations (Gen_Decl, Decls);
 210       return Gen_Decl;
 211    end P_Generic;
 212
 213    -------------------------------
 214    -- 12.1  Generic Declaration --
 215    -------------------------------
 216
 217    --  Parsed by P_Generic (12.1)
 218
 219    ------------------------------------------
 220    -- 12.1  Generic Subprogram Declaration --
 221    ------------------------------------------
 222
 223    --  Parsed by P_Generic (12.1)
 224
 225    ---------------------------------------
 226    -- 12.1  Generic Package Declaration --
 227    ---------------------------------------
 228
 229    --  Parsed by P_Generic (12.1)
 230
 231    -------------------------------
 232    -- 12.1  Generic Formal Part --
 233    -------------------------------
 234
 235    --  Parsed by P_Generic (12.1)
 236
 237    -------------------------------------------------
 238    -- 12.1   Generic Formal Parameter Declaration --
 239    -------------------------------------------------
 240
 241    --  Parsed by P_Generic (12.1)
 242
 243    ---------------------------------
 244    -- 12.3  Generic Instantiation --
 245    ---------------------------------
 246
 247    --  Generic package instantiation parsed by P_Package (7.1)
 248    --  Generic procedure instantiation parsed by P_Subprogram (6.1)
 249    --  Generic function instantiation parsed by P_Subprogram (6.1)
 250
 251    -------------------------------
 252    -- 12.3  Generic Actual Part --
 253    -------------------------------
 254
 255    --  GENERIC_ACTUAL_PART ::=
 256    --    (GENERIC_ASSOCIATION {, GENERIC_ASSOCIATION})
 257
 258    --  Returns a list of generic associations, or Empty if none are present
 259
 260    --  Error recovery: cannot raise Error_Resync
 261
 262    function P_Generic_Actual_Part_Opt return List_Id is
 263       Association_List : List_Id;
 264
 265    begin
 266       --  Figure out if a generic actual part operation is present. Clearly
 267       --  there is no generic actual part if the current token is semicolon
 268
 269       if Token = Tok_Semicolon then
 270          return No_List;
 271
 272       --  If we don't have a left paren, then we have an error, and the job
 273       --  is to figure out whether a left paren or semicolon was intended.
 274       --  We assume a missing left paren (and hence a generic actual part
 275       --  present) if the current token is not on a new line, or if it is
 276       --  indented from the subprogram token. Otherwise assume missing
 277       --  semicolon (which will be diagnosed by caller) and no generic part
 278
 279       elsif Token /= Tok_Left_Paren
 280         and then Token_Is_At_Start_Of_Line
 281         and then Start_Column <= Scope.Table (Scope.Last).Ecol
 282       then
 283          return No_List;
 284
 285       --  Otherwise we have a generic actual part (either a left paren is
 286       --  present, or we have decided that there must be a missing left paren)
 287
 288       else
 289          Association_List := New_List;
 290          T_Left_Paren;
 291
 292          loop
 293             Append (P_Generic_Association, Association_List);
 294             exit when not Comma_Present;
 295          end loop;
 296
 297          T_Right_Paren;
 298          return Association_List;
 299       end if;
 300
 301    end P_Generic_Actual_Part_Opt;
 302
 303    -------------------------------
 304    -- 12.3  Generic Association --
 305    -------------------------------
 306
 307    --  GENERIC_ASSOCIATION ::=
 308    --    [generic_formal_parameter_SELECTOR_NAME =>]
 309    --      EXPLICIT_GENERIC_ACTUAL_PARAMETER
 310
 311    --  EXPLICIT_GENERIC_ACTUAL_PARAMETER ::=
 312    --    EXPRESSION      | variable_NAME   | subprogram_NAME
 313    --  | entry_NAME      | SUBTYPE_MARK    | package_instance_NAME
 314
 315    --  Error recovery: cannot raise Error_Resync
 316
 317    function P_Generic_Association return Node_Id is
 318       Scan_State         : Saved_Scan_State;
 319       Param_Name_Node    : Node_Id;
 320       Generic_Assoc_Node : Node_Id;
 321
 322    begin
 323       Generic_Assoc_Node := New_Node (N_Generic_Association, Token_Ptr);
 324
 325       if Token in Token_Class_Desig then
 326          Param_Name_Node := Token_Node;
 327          Save_Scan_State (Scan_State); -- at designator
 328          Scan; -- past simple name or operator symbol
 329
 330          if Token = Tok_Arrow then
 331             Scan; -- past arrow
 332             Set_Selector_Name (Generic_Assoc_Node, Param_Name_Node);
 333          else
 334             Restore_Scan_State (Scan_State); -- to designator
 335          end if;
 336       end if;
 337
 338       Set_Explicit_Generic_Actual_Parameter (Generic_Assoc_Node, P_Expression);
 339       return Generic_Assoc_Node;
 340    end P_Generic_Association;
 341
 342    ---------------------------------------------
 343    -- 12.3  Explicit Generic Actual Parameter --
 344    ---------------------------------------------
 345
 346    --  Parsed by P_Generic_Association (12.3)
 347
 348    --------------------------------------
 349    -- 12.4  Formal Object Declarations --
 350    --------------------------------------
 351
 352    --  FORMAL_OBJECT_DECLARATION ::=
 353    --    DEFINING_IDENTIFIER_LIST :
 354    --      MODE SUBTYPE_MARK [:= DEFAULT_EXPRESSION];
 355
 356    --  The caller has checked that the initial token is an identifier
 357
 358    --  Error recovery: cannot raise Error_Resync
 359
 360    procedure P_Formal_Object_Declarations (Decls : List_Id) is
 361       Decl_Node  : Node_Id;
 362       Scan_State : Saved_Scan_State;
 363       Num_Idents : Nat;
 364       Ident      : Nat;
 365
 366       Idents : array (Int range 1 .. 4096) of Entity_Id;
 367       --  This array holds the list of defining identifiers. The upper bound
 368       --  of 4096 is intended to be essentially infinite, and we do not even
 369       --  bother to check for it being exceeded.
 370
 371    begin
 372       Idents (1) := P_Defining_Identifier;
 373       Num_Idents := 1;
 374
 375       while Comma_Present loop
 376          Num_Idents := Num_Idents + 1;
 377          Idents (Num_Idents) := P_Defining_Identifier;
 378       end loop;
 379
 380       T_Colon;
 381
 382       --  If there are multiple identifiers, we repeatedly scan the
 383       --  type and initialization expression information by resetting
 384       --  the scan pointer (so that we get completely separate trees
 385       --  for each occurrence).
 386
 387       if Num_Idents > 1 then
 388          Save_Scan_State (Scan_State);
 389       end if;
 390
 391       --  Loop through defining identifiers in list
 392
 393       Ident := 1;
 394       Ident_Loop : loop
 395          Decl_Node := New_Node (N_Formal_Object_Declaration, Token_Ptr);
 396          Set_Defining_Identifier (Decl_Node, Idents (Ident));
 397          P_Mode (Decl_Node);
 398          Set_Subtype_Mark (Decl_Node, P_Subtype_Mark_Resync);
 399          No_Constraint;
 400          Set_Expression (Decl_Node, Init_Expr_Opt);
 401
 402          if Ident > 1 then
 403             Set_Prev_Ids (Decl_Node, True);
 404          end if;
 405
 406          if Ident < Num_Idents then
 407             Set_More_Ids (Decl_Node, True);
 408          end if;
 409
 410          Append (Decl_Node, Decls);
 411
 412          exit Ident_Loop when Ident = Num_Idents;
 413          Ident := Ident + 1;
 414          Restore_Scan_State (Scan_State);
 415       end loop Ident_Loop;
 416
 417       TF_Semicolon;
 418    end P_Formal_Object_Declarations;
 419
 420    -----------------------------------
 421    -- 12.5  Formal Type Declaration --
 422    -----------------------------------
 423
 424    --  FORMAL_TYPE_DECLARATION ::=
 425    --    type DEFINING_IDENTIFIER [DISCRIMINANT_PART]
 426    --      is FORMAL_TYPE_DEFINITION;
 427
 428    --  The caller has checked that the initial token is TYPE
 429
 430    --  Error recovery: cannot raise Error_Resync
 431
 432    function P_Formal_Type_Declaration return Node_Id is
 433       Decl_Node  : Node_Id;
 434
 435    begin
 436       Decl_Node := New_Node (N_Formal_Type_Declaration, Token_Ptr);
 437       Scan; -- past TYPE
 438       Set_Defining_Identifier (Decl_Node, P_Defining_Identifier);
 439
 440       if P_Unknown_Discriminant_Part_Opt then
 441          Set_Unknown_Discriminants_Present (Decl_Node, True);
 442       else
 443          Set_Discriminant_Specifications
 444            (Decl_Node, P_Known_Discriminant_Part_Opt);
 445       end if;
 446
 447       T_Is;
 448
 449       Set_Formal_Type_Definition (Decl_Node, P_Formal_Type_Definition);
 450       TF_Semicolon;
 451       return Decl_Node;
 452    end P_Formal_Type_Declaration;
 453
 454    ----------------------------------
 455    -- 12.5  Formal Type Definition --
 456    ----------------------------------
 457
 458    --  FORMAL_TYPE_DEFINITION ::=
 459    --    FORMAL_PRIVATE_TYPE_DEFINITION
 460    --  | FORMAL_DERIVED_TYPE_DEFINITION
 461    --  | FORMAL_DISCRETE_TYPE_DEFINITION
 462    --  | FORMAL_SIGNED_INTEGER_TYPE_DEFINITION
 463    --  | FORMAL_MODULAR_TYPE_DEFINITION
 464    --  | FORMAL_FLOATING_POINT_DEFINITION
 465    --  | FORMAL_ORDINARY_FIXED_POINT_DEFINITION
 466    --  | FORMAL_DECIMAL_FIXED_POINT_DEFINITION
 467    --  | FORMAL_ARRAY_TYPE_DEFINITION
 468    --  | FORMAL_ACCESS_TYPE_DEFINITION
 469
 470    --  FORMAL_ARRAY_TYPE_DEFINITION ::= ARRAY_TYPE_DEFINITION
 471
 472    --  FORMAL_ACCESS_TYPE_DEFINITION ::= ACCESS_TYPE_DEFINITION
 473
 474    function P_Formal_Type_Definition return Node_Id is
 475       Scan_State : Saved_Scan_State;
 476
 477    begin
 478       if Token_Name = Name_Abstract then
 479          Check_95_Keyword (Tok_Abstract, Tok_Tagged);
 480       end if;
 481
 482       if Token_Name = Name_Tagged then
 483          Check_95_Keyword (Tok_Tagged, Tok_Private);
 484          Check_95_Keyword (Tok_Tagged, Tok_Limited);
 485       end if;
 486
 487       case Token is
 488
 489          --  Mostly we can tell what we have from the initial token. The one
 490          --  exception is ABSTRACT, where we have to scan ahead to see if we
 491          --  have a formal derived type or a formal private type definition.
 492
 493          when Tok_Abstract =>
 494             Save_Scan_State (Scan_State);
 495             Scan; -- past ABSTRACT
 496
 497             if Token = Tok_New then
 498                Restore_Scan_State (Scan_State); -- to ABSTRACT
 499                return P_Formal_Derived_Type_Definition;
 500
 501             else
 502                Restore_Scan_State (Scan_State); -- to ABSTRACT
 503                return P_Formal_Private_Type_Definition;
 504             end if;
 505
 506          when Tok_Private | Tok_Limited | Tok_Tagged =>
 507             return P_Formal_Private_Type_Definition;
 508
 509          when Tok_New =>
 510             return P_Formal_Derived_Type_Definition;
 511
 512          when Tok_Left_Paren =>
 513             return P_Formal_Discrete_Type_Definition;
 514
 515          when Tok_Range =>
 516             return P_Formal_Signed_Integer_Type_Definition;
 517
 518          when Tok_Mod =>
 519             return P_Formal_Modular_Type_Definition;
 520
 521          when Tok_Digits =>
 522             return P_Formal_Floating_Point_Definition;
 523
 524          when Tok_Delta =>
 525             return P_Formal_Fixed_Point_Definition;
 526
 527          when Tok_Array =>
 528             return P_Array_Type_Definition;
 529
 530          when Tok_Access =>
 531             return P_Access_Type_Definition;
 532
 533          when Tok_Record =>
 534             Error_Msg_SC ("record not allowed in generic type definition!");
 535             Discard_Junk_Node (P_Record_Definition);
 536             return Error;
 537
 538          when others =>
 539             Error_Msg_BC ("expecting generic type definition here");
 540             Resync_Past_Semicolon;
 541             return Error;
 542
 543       end case;
 544    end P_Formal_Type_Definition;
 545
 546    --------------------------------------------
 547    -- 12.5.1  Formal Private Type Definition --
 548    --------------------------------------------
 549
 550    --  FORMAL_PRIVATE_TYPE_DEFINITION ::=
 551    --    [[abstract] tagged] [limited] private
 552
 553    --  The caller has checked the initial token is PRIVATE, ABSTRACT,
 554    --   TAGGED or LIMITED
 555
 556    --  Error recovery: cannot raise Error_Resync
 557
 558    function P_Formal_Private_Type_Definition return Node_Id is
 559       Def_Node : Node_Id;
 560
 561    begin
 562       Def_Node := New_Node (N_Formal_Private_Type_Definition, Token_Ptr);
 563
 564       if Token = Tok_Abstract then
 565          Scan; -- past ABSTRACT
 566
 567          if Token_Name = Name_Tagged then
 568             Check_95_Keyword (Tok_Tagged, Tok_Private);
 569             Check_95_Keyword (Tok_Tagged, Tok_Limited);
 570          end if;
 571
 572          if Token /= Tok_Tagged then
 573             Error_Msg_SP ("ABSTRACT must be followed by TAGGED");
 574          else
 575             Set_Abstract_Present (Def_Node, True);
 576          end if;
 577       end if;
 578
 579       if Token = Tok_Tagged then
 580          Set_Tagged_Present (Def_Node, True);
 581          Scan; -- past TAGGED
 582       end if;
 583
 584       if Token = Tok_Limited then
 585          Set_Limited_Present (Def_Node, True);
 586          Scan; -- past LIMITED
 587       end if;
 588
 589       Set_Sloc (Def_Node, Token_Ptr);
 590       T_Private;
 591       return Def_Node;
 592    end P_Formal_Private_Type_Definition;
 593
 594    --------------------------------------------
 595    -- 12.5.1  Formal Derived Type Definition --
 596    --------------------------------------------
 597
 598    --  FORMAL_DERIVED_TYPE_DEFINITION ::=
 599    --    [abstract] new SUBTYPE_MARK [with private]
 600
 601    --  The caller has checked the initial token(s) is/are NEW or ASTRACT NEW
 602
 603    --  Error recovery: cannot raise Error_Resync
 604
 605    function P_Formal_Derived_Type_Definition return Node_Id is
 606       Def_Node : Node_Id;
 607
 608    begin
 609       Def_Node := New_Node (N_Formal_Derived_Type_Definition, Token_Ptr);
 610
 611       if Token = Tok_Abstract then
 612          Set_Abstract_Present (Def_Node);
 613          Scan; -- past ABSTRACT
 614       end if;
 615
 616       Scan; -- past NEW;
 617       Set_Subtype_Mark (Def_Node, P_Subtype_Mark);
 618       No_Constraint;
 619
 620       if Token = Tok_With then
 621          Scan; -- past WITH
 622          Set_Private_Present (Def_Node, True);
 623          T_Private;
 624       end if;
 625
 626       return Def_Node;
 627    end P_Formal_Derived_Type_Definition;
 628
 629    ---------------------------------------------
 630    -- 12.5.2  Formal Discrete Type Definition --
 631    ---------------------------------------------
 632
 633    --  FORMAL_DISCRETE_TYPE_DEFINITION ::= (<>)
 634
 635    --  The caller has checked the initial token is left paren
 636
 637    --  Error recovery: cannot raise Error_Resync
 638
 639    function P_Formal_Discrete_Type_Definition return Node_Id is
 640       Def_Node : Node_Id;
 641
 642    begin
 643       Def_Node := New_Node (N_Formal_Discrete_Type_Definition, Token_Ptr);
 644       Scan; -- past left paren
 645       T_Box;
 646       T_Right_Paren;
 647       return Def_Node;
 648    end P_Formal_Discrete_Type_Definition;
 649
 650    ---------------------------------------------------
 651    -- 12.5.2  Formal Signed Integer Type Definition --
 652    ---------------------------------------------------
 653
 654    --  FORMAL_SIGNED_INTEGER_TYPE_DEFINITION ::= range <>
 655
 656    --  The caller has checked the initial token is RANGE
 657
 658    --  Error recovery: cannot raise Error_Resync
 659
 660    function P_Formal_Signed_Integer_Type_Definition return Node_Id is
 661       Def_Node : Node_Id;
 662
 663    begin
 664       Def_Node :=
 665         New_Node (N_Formal_Signed_Integer_Type_Definition, Token_Ptr);
 666       Scan; -- past RANGE
 667       T_Box;
 668       return Def_Node;
 669    end P_Formal_Signed_Integer_Type_Definition;
 670
 671    --------------------------------------------
 672    -- 12.5.2  Formal Modular Type Definition --
 673    --------------------------------------------
 674
 675    --  FORMAL_MODULAR_TYPE_DEFINITION ::= mod <>
 676
 677    --  The caller has checked the initial token is MOD
 678
 679    --  Error recovery: cannot raise Error_Resync
 680
 681    function P_Formal_Modular_Type_Definition return Node_Id is
 682       Def_Node : Node_Id;
 683
 684    begin
 685       Def_Node :=
 686         New_Node (N_Formal_Modular_Type_Definition, Token_Ptr);
 687       Scan; -- past MOD
 688       T_Box;
 689       return Def_Node;
 690    end P_Formal_Modular_Type_Definition;
 691
 692    ----------------------------------------------
 693    -- 12.5.2  Formal Floating Point Definition --
 694    ----------------------------------------------
 695
 696    --  FORMAL_FLOATING_POINT_DEFINITION ::= digits <>
 697
 698    --  The caller has checked the initial token is DIGITS
 699
 700    --  Error recovery: cannot raise Error_Resync
 701
 702    function P_Formal_Floating_Point_Definition return Node_Id is
 703       Def_Node : Node_Id;
 704
 705    begin
 706       Def_Node :=
 707         New_Node (N_Formal_Floating_Point_Definition, Token_Ptr);
 708       Scan; -- past DIGITS
 709       T_Box;
 710       return Def_Node;
 711    end P_Formal_Floating_Point_Definition;
 712
 713    -------------------------------------------
 714    -- 12.5.2  Formal Fixed Point Definition --
 715    -------------------------------------------
 716
 717    --  This routine parses either a formal ordinary fixed point definition
 718    --  or a formal decimal fixed point definition:
 719
 720    --  FORMAL_ORDINARY_FIXED_POINT_DEFINITION ::= delta <>
 721
 722    --  FORMAL_DECIMAL_FIXED_POINT_DEFINITION ::= delta <> digits <>
 723
 724    --  The caller has checked the initial token is DELTA
 725
 726    --  Error recovery: cannot raise Error_Resync
 727
 728    function P_Formal_Fixed_Point_Definition return Node_Id is
 729       Def_Node   : Node_Id;
 730       Delta_Sloc : Source_Ptr;
 731
 732    begin
 733       Delta_Sloc := Token_Ptr;
 734       Scan; -- past DELTA
 735       T_Box;
 736
 737       if Token = Tok_Digits then
 738          Def_Node :=
 739            New_Node (N_Formal_Decimal_Fixed_Point_Definition, Delta_Sloc);
 740          Scan; -- past DIGITS
 741          T_Box;
 742       else
 743          Def_Node :=
 744            New_Node (N_Formal_Ordinary_Fixed_Point_Definition, Delta_Sloc);
 745       end if;
 746
 747       return Def_Node;
 748    end P_Formal_Fixed_Point_Definition;
 749
 750    ----------------------------------------------------
 751    -- 12.5.2  Formal Ordinary Fixed Point Definition --
 752    ----------------------------------------------------
 753
 754    --  Parsed by P_Formal_Fixed_Point_Definition (12.5.2)
 755
 756    ---------------------------------------------------
 757    -- 12.5.2  Formal Decimal Fixed Point Definition --
 758    ---------------------------------------------------
 759
 760    --  Parsed by P_Formal_Fixed_Point_Definition (12.5.2)
 761
 762    ------------------------------------------
 763    -- 12.5.3  Formal Array Type Definition --
 764    ------------------------------------------
 765
 766    --  Parsed by P_Formal_Type_Definition (12.5)
 767
 768    -------------------------------------------
 769    -- 12.5.4  Formal Access Type Definition --
 770    -------------------------------------------
 771
 772    --  Parsed by P_Formal_Type_Definition (12.5)
 773
 774    -----------------------------------------
 775    -- 12.6  Formal Subprogram Declaration --
 776    -----------------------------------------
 777
 778    --  FORMAL_SUBPROGRAM_DECLARATION ::=
 779    --    with SUBPROGRAM_SPECIFICATION [is SUBPROGRAM_DEFAULT];
 780
 781    --  SUBPROGRAM_DEFAULT ::= DEFAULT_NAME | <>
 782
 783    --  DEFAULT_NAME ::= NAME
 784
 785    --  The caller has checked that the initial tokens are WITH FUNCTION or
 786    --  WITH PROCEDURE, and the initial WITH has been scanned out.
 787
 788    --  Note: we separate this into two procedures because the name is allowed
 789    --  to be an operator symbol for a function, but not for a procedure.
 790
 791    --  Error recovery: cannot raise Error_Resync
 792
 793    function P_Formal_Subprogram_Declaration return Node_Id is
 794       Def_Node : Node_Id;
 795
 796    begin
 797       Def_Node := New_Node (N_Formal_Subprogram_Declaration, Prev_Token_Ptr);
 798       Set_Specification (Def_Node, P_Subprogram_Specification);
 799
 800       if Token = Tok_Is then
 801          T_Is; -- past IS, skip extra IS or ";"
 802
 803          if Token = Tok_Box then
 804             Set_Box_Present (Def_Node, True);
 805             Scan; -- past <>
 806
 807          else
 808             Set_Default_Name (Def_Node, P_Name);
 809          end if;
 810
 811       end if;
 812
 813       T_Semicolon;
 814       return Def_Node;
 815    end P_Formal_Subprogram_Declaration;
 816
 817    ------------------------------
 818    -- 12.6  Subprogram Default --
 819    ------------------------------
 820
 821    --  Parsed by P_Formal_Procedure_Declaration (12.6)
 822
 823    ------------------------
 824    -- 12.6  Default Name --
 825    ------------------------
 826
 827    --  Parsed by P_Formal_Procedure_Declaration (12.6)
 828
 829    --------------------------------------
 830    -- 12.7  Formal Package Declaration --
 831    --------------------------------------
 832
 833    --  FORMAL_PACKAGE_DECLARATION ::=
 834    --    with package DEFINING_IDENTIFIER
 835    --      is new generic_package_NAME FORMAL_PACKAGE_ACTUAL_PART;
 836
 837    --  FORMAL_PACKAGE_ACTUAL_PART ::=
 838    --    (<>) | [GENERIC_ACTUAL_PART]
 839
 840    --  The caller has checked that the initial tokens are WITH PACKAGE,
 841    --  and the initial WITH has been scanned out (so Token = Tok_Package).
 842
 843    --  Error recovery: cannot raise Error_Resync
 844
 845    function P_Formal_Package_Declaration return Node_Id is
 846       Def_Node : Node_Id;
 847       Scan_State : Saved_Scan_State;
 848
 849    begin
 850       Def_Node := New_Node (N_Formal_Package_Declaration, Prev_Token_Ptr);
 851       Scan; -- past PACKAGE
 852       Set_Defining_Identifier (Def_Node, P_Defining_Identifier);
 853       T_Is;
 854       T_New;
 855       Set_Name (Def_Node, P_Qualified_Simple_Name);
 856
 857       if Token = Tok_Left_Paren then
 858          Save_Scan_State (Scan_State); -- at the left paren
 859          Scan; -- past the left paren
 860
 861          if Token = Tok_Box then
 862             Set_Box_Present (Def_Node, True);
 863             Scan; -- past box
 864             T_Right_Paren;
 865
 866          else
 867             Restore_Scan_State (Scan_State); -- to the left paren
 868             Set_Generic_Associations (Def_Node, P_Generic_Actual_Part_Opt);
 869          end if;
 870       end if;
 871
 872       T_Semicolon;
 873       return Def_Node;
 874    end P_Formal_Package_Declaration;
 875
 876    --------------------------------------
 877    -- 12.7  Formal Package Actual Part --
 878    --------------------------------------
 879
 880    --  Parsed by P_Formal_Package_Declaration (12.7)
 881
 882 end Ch12;