gcc/ada/cstand.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                               C S T A N D                                --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2008, Free Software Foundation, Inc.         --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT; see file COPYING3.  If not, go to --
  19 -- http://www.gnu.org/licenses for a complete copy of the license.          --
  20 --                                                                          --
  21 -- GNAT was originally developed  by the GNAT team at  New York University. --
  22 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  23 --                                                                          --
  24 ------------------------------------------------------------------------------
  25
  26 with Atree;    use Atree;
  27 with Csets;    use Csets;
  28 with Debug;    use Debug;
  29 with Einfo;    use Einfo;
  30 with Layout;   use Layout;
  31 with Namet;    use Namet;
  32 with Nlists;   use Nlists;
  33 with Nmake;    use Nmake;
  34 with Opt;      use Opt;
  35 with Output;   use Output;
  36 with Targparm; use Targparm;
  37 with Tbuild;   use Tbuild;
  38 with Ttypes;   use Ttypes;
  39 with Ttypef;   use Ttypef;
  40 with Scn;
  41 with Sem_Mech; use Sem_Mech;
  42 with Sem_Util; use Sem_Util;
  43 with Sinfo;    use Sinfo;
  44 with Snames;   use Snames;
  45 with Stand;    use Stand;
  46 with Uintp;    use Uintp;
  47 with Urealp;   use Urealp;
  48
  49 package body CStand is
  50
  51    Stloc  : constant Source_Ptr := Standard_Location;
  52    Staloc : constant Source_Ptr := Standard_ASCII_Location;
  53    --  Standard abbreviations used throughout this package
  54
  55    -----------------------
  56    -- Local Subprograms --
  57    -----------------------
  58
  59    procedure Build_Float_Type (E : Entity_Id; Siz : Int; Digs : Int);
  60    --  Procedure to build standard predefined float base type. The first
  61    --  parameter is the entity for the type, and the second parameter
  62    --  is the size in bits. The third parameter is the digits value.
  63
  64    procedure Build_Signed_Integer_Type (E : Entity_Id; Siz : Int);
  65    --  Procedure to build standard predefined signed integer subtype. The
  66    --  first parameter is the entity for the subtype. The second parameter
  67    --  is the size in bits. The corresponding base type is not built by
  68    --  this routine but instead must be built by the caller where needed.
  69
  70    procedure Create_Operators;
  71    --  Make entries for each of the predefined operators in Standard
  72
  73    procedure Create_Unconstrained_Base_Type
  74      (E : Entity_Id;
  75       K : Entity_Kind);
  76    --  The predefined signed integer types are constrained subtypes which
  77    --  must have a corresponding unconstrained base type. This type is almost
  78    --  useless. The only place it has semantics is Subtypes_Statically_Match.
  79    --  Consequently, we arrange for it to be identical apart from the setting
  80    --  of the constrained bit. This routine takes an entity E for the Type,
  81    --  copies it to estabish the base type, then resets the Ekind of the
  82    --  original entity to K (the Ekind for the subtype). The Etype field of
  83    --  E is set by the call (to point to the created base type entity), and
  84    --  also the Is_Constrained flag of E is set.
  85    --
  86    --  To understand the exact requirement for this, see RM 3.5.4(11) which
  87    --  makes it clear that Integer, for example, is constrained, with the
  88    --  constraint bounds matching the bounds of the (unconstrained) base
  89    --  type. The point is that Integer and Integer'Base have identical
  90    --  bounds, but do not statically match, since a subtype with constraints
  91    --  never matches a subtype with no constraints.
  92
  93    function Identifier_For (S : Standard_Entity_Type) return Node_Id;
  94    --  Returns an identifier node with the same name as the defining
  95    --  identifier corresponding to the given Standard_Entity_Type value
  96
  97    procedure Make_Component
  98      (Rec : Entity_Id;
  99       Typ : Entity_Id;
 100       Nam : String);
 101    --  Build a record component with the given type and name, and append to
 102    --  the list of components of Rec.
 103
 104    function Make_Formal
 105      (Typ         : Entity_Id;
 106       Formal_Name : String) return Entity_Id;
 107    --  Construct entity for subprogram formal with given name and type
 108
 109    function Make_Integer (V : Uint) return Node_Id;
 110    --  Builds integer literal with given value
 111
 112    procedure Make_Name (Id : Entity_Id; Nam : String);
 113    --  Make an entry in the names table for Nam, and set as Chars field of Id
 114
 115    function New_Operator (Op : Name_Id; Typ : Entity_Id) return Entity_Id;
 116    --  Build entity for standard operator with given name and type
 117
 118    function New_Standard_Entity
 119      (New_Node_Kind : Node_Kind := N_Defining_Identifier) return Entity_Id;
 120    --  Builds a new entity for Standard
 121
 122    procedure Print_Standard;
 123    --  Print representation of package Standard if switch set
 124
 125    procedure Set_Integer_Bounds
 126      (Id  : Entity_Id;
 127       Typ : Entity_Id;
 128       Lb  : Uint;
 129       Hb  : Uint);
 130    --  Procedure to set bounds for integer type or subtype. Id is the entity
 131    --  whose bounds and type are to be set. The Typ parameter is the Etype
 132    --  value for the entity (which will be the same as Id for all predefined
 133    --  integer base types. The third and fourth parameters are the bounds.
 134
 135    ----------------------
 136    -- Build_Float_Type --
 137    ----------------------
 138
 139    procedure Build_Float_Type (E : Entity_Id; Siz : Int; Digs : Int) is
 140    begin
 141       Set_Type_Definition (Parent (E),
 142         Make_Floating_Point_Definition (Stloc,
 143           Digits_Expression => Make_Integer (UI_From_Int (Digs))));
 144       Set_Ekind                      (E, E_Floating_Point_Type);
 145       Set_Etype                      (E, E);
 146       Init_Size                      (E, Siz);
 147       Set_Elem_Alignment             (E);
 148       Init_Digits_Value              (E, Digs);
 149       Set_Float_Bounds               (E);
 150       Set_Is_Frozen                  (E);
 151       Set_Is_Public                  (E);
 152       Set_Size_Known_At_Compile_Time (E);
 153    end Build_Float_Type;
 154
 155    -------------------------------
 156    -- Build_Signed_Integer_Type --
 157    -------------------------------
 158
 159    procedure Build_Signed_Integer_Type (E : Entity_Id; Siz : Int) is
 160       U2Siz1 : constant Uint := 2 ** (Siz - 1);
 161       Lbound : constant Uint := -U2Siz1;
 162       Ubound : constant Uint := U2Siz1 - 1;
 163
 164    begin
 165       Set_Type_Definition (Parent (E),
 166         Make_Signed_Integer_Type_Definition (Stloc,
 167           Low_Bound  => Make_Integer (Lbound),
 168           High_Bound => Make_Integer (Ubound)));
 169
 170       Set_Ekind                      (E, E_Signed_Integer_Type);
 171       Set_Etype                      (E, E);
 172       Init_Size                      (E, Siz);
 173       Set_Elem_Alignment             (E);
 174       Set_Integer_Bounds             (E, E, Lbound, Ubound);
 175       Set_Is_Frozen                  (E);
 176       Set_Is_Public                  (E);
 177       Set_Is_Known_Valid             (E);
 178       Set_Size_Known_At_Compile_Time (E);
 179    end Build_Signed_Integer_Type;
 180
 181    ----------------------
 182    -- Create_Operators --
 183    ----------------------
 184
 185    --  Each operator has an abbreviated signature. The formals have the names
 186    --  LEFT and RIGHT. Their types are not actually used for resolution.
 187
 188    procedure Create_Operators is
 189       Op_Node : Entity_Id;
 190
 191       --  The following tables define the binary and unary operators and their
 192       --  corresponding result type.
 193
 194       Binary_Ops : constant array (S_Binary_Ops) of Name_Id :=
 195
 196          --  There is one entry here for each binary operator, except for the
 197          --  case of concatenation, where there are three entries, one for a
 198          --  String result, one for Wide_String, and one for Wide_Wide_String.
 199
 200         (Name_Op_Add,
 201          Name_Op_And,
 202          Name_Op_Concat,
 203          Name_Op_Concat,
 204          Name_Op_Concat,
 205          Name_Op_Divide,
 206          Name_Op_Eq,
 207          Name_Op_Expon,
 208          Name_Op_Ge,
 209          Name_Op_Gt,
 210          Name_Op_Le,
 211          Name_Op_Lt,
 212          Name_Op_Mod,
 213          Name_Op_Multiply,
 214          Name_Op_Ne,
 215          Name_Op_Or,
 216          Name_Op_Rem,
 217          Name_Op_Subtract,
 218          Name_Op_Xor);
 219
 220       Bin_Op_Types : constant array (S_Binary_Ops) of Entity_Id :=
 221
 222          --  This table has the corresponding result types. The entries are
 223          --  ordered so they correspond to the Binary_Ops array above.
 224
 225         (Universal_Integer,         -- Add
 226          Standard_Boolean,          -- And
 227          Standard_String,           -- Concat (String)
 228          Standard_Wide_String,      -- Concat (Wide_String)
 229          Standard_Wide_Wide_String, -- Concat (Wide_Wide_String)
 230          Universal_Integer,         -- Divide
 231          Standard_Boolean,          -- Eq
 232          Universal_Integer,         -- Expon
 233          Standard_Boolean,          -- Ge
 234          Standard_Boolean,          -- Gt
 235          Standard_Boolean,          -- Le
 236          Standard_Boolean,          -- Lt
 237          Universal_Integer,         -- Mod
 238          Universal_Integer,         -- Multiply
 239          Standard_Boolean,          -- Ne
 240          Standard_Boolean,          -- Or
 241          Universal_Integer,         -- Rem
 242          Universal_Integer,         -- Subtract
 243          Standard_Boolean);         -- Xor
 244
 245       Unary_Ops : constant array (S_Unary_Ops) of Name_Id :=
 246
 247          --  There is one entry here for each unary operator
 248
 249         (Name_Op_Abs,
 250          Name_Op_Subtract,
 251          Name_Op_Not,
 252          Name_Op_Add);
 253
 254       Unary_Op_Types : constant array (S_Unary_Ops) of Entity_Id :=
 255
 256          --  This table has the corresponding result types. The entries are
 257          --  ordered so they correspond to the Unary_Ops array above.
 258
 259         (Universal_Integer,     -- Abs
 260          Universal_Integer,     -- Subtract
 261          Standard_Boolean,      -- Not
 262          Universal_Integer);    -- Add
 263
 264    begin
 265       for J in S_Binary_Ops loop
 266          Op_Node := New_Operator (Binary_Ops (J), Bin_Op_Types (J));
 267          SE (J)  := Op_Node;
 268          Append_Entity (Make_Formal (Any_Type, "LEFT"),  Op_Node);
 269          Append_Entity (Make_Formal (Any_Type, "RIGHT"), Op_Node);
 270       end loop;
 271
 272       for J in S_Unary_Ops loop
 273          Op_Node := New_Operator (Unary_Ops (J), Unary_Op_Types (J));
 274          SE (J)  := Op_Node;
 275          Append_Entity (Make_Formal (Any_Type, "RIGHT"), Op_Node);
 276       end loop;
 277
 278       --  For concatenation, we create a separate operator for each
 279       --  array type. This simplifies the resolution of the component-
 280       --  component concatenation operation. In Standard, we set the types
 281       --  of the formals for string, wide [wide]_string, concatenations.
 282
 283       Set_Etype (First_Entity (Standard_Op_Concat),  Standard_String);
 284       Set_Etype (Last_Entity  (Standard_Op_Concat),  Standard_String);
 285
 286       Set_Etype (First_Entity (Standard_Op_Concatw), Standard_Wide_String);
 287       Set_Etype (Last_Entity  (Standard_Op_Concatw), Standard_Wide_String);
 288
 289       Set_Etype (First_Entity (Standard_Op_Concatww),
 290                   Standard_Wide_Wide_String);
 291
 292       Set_Etype (Last_Entity (Standard_Op_Concatww),
 293                    Standard_Wide_Wide_String);
 294
 295    end Create_Operators;
 296
 297    ---------------------
 298    -- Create_Standard --
 299    ---------------------
 300
 301    --  The tree for the package Standard is prefixed to all compilations.
 302    --  Several entities required by semantic analysis are denoted by global
 303    --  variables that are initialized to point to the corresponding
 304    --  occurrences in STANDARD. The visible entities of STANDARD are
 305    --  created here. The private entities defined in STANDARD are created
 306    --  by Initialize_Standard in the semantics module.
 307
 308    procedure Create_Standard is
 309       Decl_S : constant List_Id := New_List;
 310       --  List of declarations in Standard
 311
 312       Decl_A : constant List_Id := New_List;
 313       --  List of declarations in ASCII
 314
 315       Decl       : Node_Id;
 316       Pspec      : Node_Id;
 317       Tdef_Node  : Node_Id;
 318       Ident_Node : Node_Id;
 319       Ccode      : Char_Code;
 320       E_Id       : Entity_Id;
 321       R_Node     : Node_Id;
 322       B_Node     : Node_Id;
 323
 324       procedure Build_Exception (S : Standard_Entity_Type);
 325       --  Procedure to declare given entity as an exception
 326
 327       ---------------------
 328       -- Build_Exception --
 329       ---------------------
 330
 331       procedure Build_Exception (S : Standard_Entity_Type) is
 332       begin
 333          Set_Ekind          (Standard_Entity (S), E_Exception);
 334          Set_Etype          (Standard_Entity (S), Standard_Exception_Type);
 335          Set_Exception_Code (Standard_Entity (S), Uint_0);
 336          Set_Is_Public      (Standard_Entity (S), True);
 337
 338          Decl :=
 339            Make_Exception_Declaration (Stloc,
 340              Defining_Identifier => Standard_Entity (S));
 341          Append (Decl, Decl_S);
 342       end Build_Exception;
 343
 344    --  Start of processing for Create_Standard
 345
 346    begin
 347       --  Initialize scanner for internal scans of literals
 348
 349       Scn.Initialize_Scanner (No_Unit, Internal_Source_File);
 350
 351       --  First step is to create defining identifiers for each entity
 352
 353       for S in Standard_Entity_Type loop
 354          declare
 355             S_Name : constant String := Standard_Entity_Type'Image (S);
 356             --  Name of entity (note we skip S_ at the start)
 357
 358             Ident_Node : Node_Id;
 359             --  Defining identifier node
 360
 361          begin
 362             Ident_Node := New_Standard_Entity;
 363             Make_Name (Ident_Node, S_Name (3 .. S_Name'Length));
 364             Standard_Entity (S) := Ident_Node;
 365          end;
 366       end loop;
 367
 368       --  Create package declaration node for package Standard
 369
 370       Standard_Package_Node := New_Node (N_Package_Declaration, Stloc);
 371
 372       Pspec := New_Node (N_Package_Specification, Stloc);
 373       Set_Specification (Standard_Package_Node, Pspec);
 374
 375       Set_Defining_Unit_Name (Pspec, Standard_Standard);
 376       Set_Visible_Declarations (Pspec, Decl_S);
 377
 378       Set_Ekind (Standard_Standard, E_Package);
 379       Set_Is_Pure (Standard_Standard);
 380       Set_Is_Compilation_Unit (Standard_Standard);
 381
 382       --  Create type/subtype declaration nodes for standard types
 383
 384       for S in S_Types loop
 385
 386          --  Subtype declaration case
 387
 388          if S = S_Natural or else S = S_Positive then
 389             Decl := New_Node (N_Subtype_Declaration, Stloc);
 390             Set_Subtype_Indication (Decl,
 391               New_Occurrence_Of (Standard_Integer, Stloc));
 392
 393          --  Full type declaration case
 394
 395          else
 396             Decl := New_Node (N_Full_Type_Declaration, Stloc);
 397          end if;
 398
 399          Set_Is_Frozen (Standard_Entity (S));
 400          Set_Is_Public (Standard_Entity (S));
 401          Set_Defining_Identifier (Decl, Standard_Entity (S));
 402          Append (Decl, Decl_S);
 403       end loop;
 404
 405       --  Create type definition node for type Boolean. The Size is set to
 406       --  1 as required by Ada 95 and current ARG interpretations for Ada/83.
 407
 408       --  Note: Object_Size of Boolean is 8. This means that we do NOT in
 409       --  general know that Boolean variables have valid values, so we do
 410       --  not set the Is_Known_Valid flag.
 411
 412       Tdef_Node := New_Node (N_Enumeration_Type_Definition, Stloc);
 413       Set_Literals (Tdef_Node, New_List);
 414       Append (Standard_False, Literals (Tdef_Node));
 415       Append (Standard_True, Literals (Tdef_Node));
 416       Set_Type_Definition (Parent (Standard_Boolean), Tdef_Node);
 417
 418       Set_Ekind          (Standard_Boolean, E_Enumeration_Type);
 419       Set_First_Literal  (Standard_Boolean, Standard_False);
 420       Set_Etype          (Standard_Boolean, Standard_Boolean);
 421       Init_Esize         (Standard_Boolean, Standard_Character_Size);
 422       Init_RM_Size       (Standard_Boolean, 1);
 423       Set_Elem_Alignment (Standard_Boolean);
 424
 425       Set_Is_Unsigned_Type           (Standard_Boolean);
 426       Set_Size_Known_At_Compile_Time (Standard_Boolean);
 427
 428       Set_Ekind           (Standard_True, E_Enumeration_Literal);
 429       Set_Etype           (Standard_True, Standard_Boolean);
 430       Set_Enumeration_Pos (Standard_True, Uint_1);
 431       Set_Enumeration_Rep (Standard_True, Uint_1);
 432       Set_Is_Known_Valid  (Standard_True, True);
 433
 434       Set_Ekind           (Standard_False, E_Enumeration_Literal);
 435       Set_Etype           (Standard_False, Standard_Boolean);
 436       Set_Enumeration_Pos (Standard_False, Uint_0);
 437       Set_Enumeration_Rep (Standard_False, Uint_0);
 438       Set_Is_Known_Valid  (Standard_False, True);
 439
 440       --  For the bounds of Boolean, we create a range node corresponding to
 441
 442       --    range False .. True
 443
 444       --  where the occurrences of the literals must point to the
 445       --  corresponding definition.
 446
 447       R_Node := New_Node (N_Range, Stloc);
 448       B_Node := New_Node (N_Identifier, Stloc);
 449       Set_Chars  (B_Node, Chars (Standard_False));
 450       Set_Entity (B_Node,  Standard_False);
 451       Set_Etype  (B_Node, Standard_Boolean);
 452       Set_Is_Static_Expression (B_Node);
 453       Set_Low_Bound  (R_Node, B_Node);
 454
 455       B_Node := New_Node (N_Identifier, Stloc);
 456       Set_Chars  (B_Node, Chars (Standard_True));
 457       Set_Entity (B_Node,  Standard_True);
 458       Set_Etype  (B_Node, Standard_Boolean);
 459       Set_Is_Static_Expression (B_Node);
 460       Set_High_Bound (R_Node, B_Node);
 461
 462       Set_Scalar_Range (Standard_Boolean, R_Node);
 463       Set_Etype (R_Node, Standard_Boolean);
 464       Set_Parent (R_Node, Standard_Boolean);
 465
 466       --  Record entity identifiers for boolean literals in the
 467       --  Boolean_Literals array, for easy reference during expansion.
 468
 469       Boolean_Literals := (False => Standard_False, True => Standard_True);
 470
 471       --  Create type definition nodes for predefined integer types
 472
 473       Build_Signed_Integer_Type
 474         (Standard_Short_Short_Integer, Standard_Short_Short_Integer_Size);
 475
 476       Build_Signed_Integer_Type
 477         (Standard_Short_Integer, Standard_Short_Integer_Size);
 478
 479       Build_Signed_Integer_Type
 480         (Standard_Integer, Standard_Integer_Size);
 481
 482       declare
 483          LIS : Nat;
 484       begin
 485          if Debug_Flag_M then
 486             LIS := 64;
 487          else
 488             LIS := Standard_Long_Integer_Size;
 489          end if;
 490
 491          Build_Signed_Integer_Type (Standard_Long_Integer, LIS);
 492       end;
 493
 494       Build_Signed_Integer_Type
 495         (Standard_Long_Long_Integer, Standard_Long_Long_Integer_Size);
 496
 497       Create_Unconstrained_Base_Type
 498         (Standard_Short_Short_Integer, E_Signed_Integer_Subtype);
 499
 500       Create_Unconstrained_Base_Type
 501         (Standard_Short_Integer, E_Signed_Integer_Subtype);
 502
 503       Create_Unconstrained_Base_Type
 504         (Standard_Integer, E_Signed_Integer_Subtype);
 505
 506       Create_Unconstrained_Base_Type
 507         (Standard_Long_Integer, E_Signed_Integer_Subtype);
 508
 509       Create_Unconstrained_Base_Type
 510         (Standard_Long_Long_Integer, E_Signed_Integer_Subtype);
 511
 512       --  Create type definition nodes for predefined float types
 513
 514       Build_Float_Type
 515         (Standard_Short_Float,
 516          Standard_Short_Float_Size,
 517          Standard_Short_Float_Digits);
 518
 519       Build_Float_Type
 520         (Standard_Float,
 521          Standard_Float_Size,
 522          Standard_Float_Digits);
 523
 524       Build_Float_Type
 525         (Standard_Long_Float,
 526          Standard_Long_Float_Size,
 527          Standard_Long_Float_Digits);
 528
 529       Build_Float_Type
 530         (Standard_Long_Long_Float,
 531          Standard_Long_Long_Float_Size,
 532          Standard_Long_Long_Float_Digits);
 533
 534       --  Create type definition node for type Character. Note that we do not
 535       --  set the Literals field, since type Character is handled with special
 536       --  routine that do not need a literal list.
 537
 538       Tdef_Node := New_Node (N_Enumeration_Type_Definition, Stloc);
 539       Set_Type_Definition (Parent (Standard_Character), Tdef_Node);
 540
 541       Set_Ekind          (Standard_Character, E_Enumeration_Type);
 542       Set_Etype          (Standard_Character, Standard_Character);
 543       Init_Esize         (Standard_Character, Standard_Character_Size);
 544       Init_RM_Size       (Standard_Character, 8);
 545       Set_Elem_Alignment (Standard_Character);
 546
 547       Set_Is_Unsigned_Type           (Standard_Character);
 548       Set_Is_Character_Type          (Standard_Character);
 549       Set_Is_Known_Valid             (Standard_Character);
 550       Set_Size_Known_At_Compile_Time (Standard_Character);
 551
 552       --  Create the bounds for type Character
 553
 554       R_Node := New_Node (N_Range, Stloc);
 555
 556       --  Low bound for type Character (Standard.Nul)
 557
 558       B_Node := New_Node (N_Character_Literal, Stloc);
 559       Set_Is_Static_Expression (B_Node);
 560       Set_Chars                (B_Node, No_Name);
 561       Set_Char_Literal_Value   (B_Node, Uint_0);
 562       Set_Entity               (B_Node, Empty);
 563       Set_Etype                (B_Node, Standard_Character);
 564       Set_Low_Bound (R_Node, B_Node);
 565
 566       --  High bound for type Character
 567
 568       B_Node := New_Node (N_Character_Literal, Stloc);
 569       Set_Is_Static_Expression (B_Node);
 570       Set_Chars                (B_Node, No_Name);
 571       Set_Char_Literal_Value   (B_Node, UI_From_Int (16#FF#));
 572       Set_Entity               (B_Node, Empty);
 573       Set_Etype                (B_Node, Standard_Character);
 574       Set_High_Bound (R_Node, B_Node);
 575
 576       Set_Scalar_Range (Standard_Character, R_Node);
 577       Set_Etype (R_Node, Standard_Character);
 578       Set_Parent (R_Node, Standard_Character);
 579
 580       --  Create type definition for type Wide_Character. Note that we do not
 581       --  set the Literals field, since type Wide_Character is handled with
 582       --  special routines that do not need a literal list.
 583
 584       Tdef_Node := New_Node (N_Enumeration_Type_Definition, Stloc);
 585       Set_Type_Definition (Parent (Standard_Wide_Character), Tdef_Node);
 586
 587       Set_Ekind      (Standard_Wide_Character, E_Enumeration_Type);
 588       Set_Etype      (Standard_Wide_Character, Standard_Wide_Character);
 589       Init_Size      (Standard_Wide_Character, Standard_Wide_Character_Size);
 590
 591       Set_Elem_Alignment             (Standard_Wide_Character);
 592       Set_Is_Unsigned_Type           (Standard_Wide_Character);
 593       Set_Is_Character_Type          (Standard_Wide_Character);
 594       Set_Is_Known_Valid             (Standard_Wide_Character);
 595       Set_Size_Known_At_Compile_Time (Standard_Wide_Character);
 596
 597       --  Create the bounds for type Wide_Character
 598
 599       R_Node := New_Node (N_Range, Stloc);
 600
 601       --  Low bound for type Wide_Character
 602
 603       B_Node := New_Node (N_Character_Literal, Stloc);
 604       Set_Is_Static_Expression (B_Node);
 605       Set_Chars                (B_Node, No_Name);    --  ???
 606       Set_Char_Literal_Value   (B_Node, Uint_0);
 607       Set_Entity               (B_Node, Empty);
 608       Set_Etype                (B_Node, Standard_Wide_Character);
 609       Set_Low_Bound (R_Node, B_Node);
 610
 611       --  High bound for type Wide_Character
 612
 613       B_Node := New_Node (N_Character_Literal, Stloc);
 614       Set_Is_Static_Expression (B_Node);
 615       Set_Chars                (B_Node, No_Name);    --  ???
 616       Set_Char_Literal_Value   (B_Node, UI_From_Int (16#FFFF#));
 617       Set_Entity               (B_Node, Empty);
 618       Set_Etype                (B_Node, Standard_Wide_Character);
 619       Set_High_Bound           (R_Node, B_Node);
 620
 621       Set_Scalar_Range (Standard_Wide_Character, R_Node);
 622       Set_Etype (R_Node, Standard_Wide_Character);
 623       Set_Parent (R_Node, Standard_Wide_Character);
 624
 625       --  Create type definition for type Wide_Wide_Character. Note that we
 626       --  do not set the Literals field, since type Wide_Wide_Character is
 627       --  handled with special routines that do not need a literal list.
 628
 629       Tdef_Node := New_Node (N_Enumeration_Type_Definition, Stloc);
 630       Set_Type_Definition (Parent (Standard_Wide_Wide_Character), Tdef_Node);
 631
 632       Set_Ekind (Standard_Wide_Wide_Character, E_Enumeration_Type);
 633       Set_Etype (Standard_Wide_Wide_Character,
 634                  Standard_Wide_Wide_Character);
 635       Init_Size (Standard_Wide_Wide_Character,
 636                  Standard_Wide_Wide_Character_Size);
 637
 638       Set_Elem_Alignment             (Standard_Wide_Wide_Character);
 639       Set_Is_Unsigned_Type           (Standard_Wide_Wide_Character);
 640       Set_Is_Character_Type          (Standard_Wide_Wide_Character);
 641       Set_Is_Known_Valid             (Standard_Wide_Wide_Character);
 642       Set_Size_Known_At_Compile_Time (Standard_Wide_Wide_Character);
 643       Set_Is_Ada_2005_Only           (Standard_Wide_Wide_Character);
 644
 645       --  Create the bounds for type Wide_Wide_Character
 646
 647       R_Node := New_Node (N_Range, Stloc);
 648
 649       --  Low bound for type Wide_Wide_Character
 650
 651       B_Node := New_Node (N_Character_Literal, Stloc);
 652       Set_Is_Static_Expression (B_Node);
 653       Set_Chars                (B_Node, No_Name);    --  ???
 654       Set_Char_Literal_Value   (B_Node, Uint_0);
 655       Set_Entity               (B_Node, Empty);
 656       Set_Etype                (B_Node, Standard_Wide_Wide_Character);
 657       Set_Low_Bound (R_Node, B_Node);
 658
 659       --  High bound for type Wide_Wide_Character
 660
 661       B_Node := New_Node (N_Character_Literal, Stloc);
 662       Set_Is_Static_Expression (B_Node);
 663       Set_Chars                (B_Node, No_Name);    --  ???
 664       Set_Char_Literal_Value   (B_Node, UI_From_Int (16#7FFF_FFFF#));
 665       Set_Entity               (B_Node, Empty);
 666       Set_Etype                (B_Node, Standard_Wide_Wide_Character);
 667       Set_High_Bound           (R_Node, B_Node);
 668
 669       Set_Scalar_Range (Standard_Wide_Wide_Character, R_Node);
 670       Set_Etype (R_Node, Standard_Wide_Wide_Character);
 671       Set_Parent (R_Node, Standard_Wide_Wide_Character);
 672
 673       --  Create type definition node for type String
 674
 675       Tdef_Node := New_Node (N_Unconstrained_Array_Definition, Stloc);
 676
 677       declare
 678          CompDef_Node : Node_Id;
 679       begin
 680          CompDef_Node := New_Node (N_Component_Definition, Stloc);
 681          Set_Aliased_Present      (CompDef_Node, False);
 682          Set_Access_Definition    (CompDef_Node, Empty);
 683          Set_Subtype_Indication   (CompDef_Node, Identifier_For (S_Character));
 684          Set_Component_Definition (Tdef_Node, CompDef_Node);
 685       end;
 686
 687       Set_Subtype_Marks      (Tdef_Node, New_List);
 688       Append (Identifier_For (S_Positive), Subtype_Marks (Tdef_Node));
 689       Set_Type_Definition (Parent (Standard_String), Tdef_Node);
 690
 691       Set_Ekind          (Standard_String, E_String_Type);
 692       Set_Etype          (Standard_String, Standard_String);
 693       Set_Component_Type (Standard_String, Standard_Character);
 694       Set_Component_Size (Standard_String, Uint_8);
 695       Init_Size_Align    (Standard_String);
 696       Set_Alignment      (Standard_String, Uint_1);
 697
 698       --  On targets where a storage unit is larger than a byte (such as AAMP),
 699       --  pragma Pack has a real effect on the representation of type String,
 700       --  and the type must be marked as having a nonstandard representation.
 701
 702       if System_Storage_Unit > Uint_8 then
 703          Set_Has_Non_Standard_Rep (Standard_String);
 704          Set_Has_Pragma_Pack      (Standard_String);
 705       end if;
 706
 707       --  Set index type of String
 708
 709       E_Id := First
 710         (Subtype_Marks (Type_Definition (Parent (Standard_String))));
 711       Set_First_Index (Standard_String, E_Id);
 712       Set_Entity (E_Id, Standard_Positive);
 713       Set_Etype (E_Id, Standard_Positive);
 714
 715       --  Create type definition node for type Wide_String
 716
 717       Tdef_Node := New_Node (N_Unconstrained_Array_Definition, Stloc);
 718
 719       declare
 720          CompDef_Node : Node_Id;
 721       begin
 722          CompDef_Node := New_Node (N_Component_Definition, Stloc);
 723          Set_Aliased_Present    (CompDef_Node, False);
 724          Set_Access_Definition  (CompDef_Node, Empty);
 725          Set_Subtype_Indication (CompDef_Node,
 726                                  Identifier_For (S_Wide_Character));
 727          Set_Component_Definition (Tdef_Node, CompDef_Node);
 728       end;
 729
 730       Set_Subtype_Marks (Tdef_Node, New_List);
 731       Append (Identifier_For (S_Positive), Subtype_Marks (Tdef_Node));
 732       Set_Type_Definition (Parent (Standard_Wide_String), Tdef_Node);
 733
 734       Set_Ekind          (Standard_Wide_String, E_String_Type);
 735       Set_Etype          (Standard_Wide_String, Standard_Wide_String);
 736       Set_Component_Type (Standard_Wide_String, Standard_Wide_Character);
 737       Set_Component_Size (Standard_Wide_String, Uint_16);
 738       Init_Size_Align    (Standard_Wide_String);
 739
 740       --  Set index type of Wide_String
 741
 742       E_Id := First
 743         (Subtype_Marks (Type_Definition (Parent (Standard_Wide_String))));
 744       Set_First_Index (Standard_Wide_String, E_Id);
 745       Set_Entity (E_Id, Standard_Positive);
 746       Set_Etype (E_Id, Standard_Positive);
 747
 748       --  Create type definition node for type Wide_Wide_String
 749
 750       Tdef_Node := New_Node (N_Unconstrained_Array_Definition, Stloc);
 751
 752       declare
 753          CompDef_Node : Node_Id;
 754       begin
 755          CompDef_Node := New_Node (N_Component_Definition, Stloc);
 756          Set_Aliased_Present    (CompDef_Node, False);
 757          Set_Access_Definition  (CompDef_Node, Empty);
 758          Set_Subtype_Indication (CompDef_Node,
 759                                  Identifier_For (S_Wide_Wide_Character));
 760          Set_Component_Definition (Tdef_Node, CompDef_Node);
 761       end;
 762
 763       Set_Subtype_Marks (Tdef_Node, New_List);
 764       Append (Identifier_For (S_Positive), Subtype_Marks (Tdef_Node));
 765       Set_Type_Definition (Parent (Standard_Wide_Wide_String), Tdef_Node);
 766
 767       Set_Ekind            (Standard_Wide_Wide_String, E_String_Type);
 768       Set_Etype            (Standard_Wide_Wide_String,
 769                             Standard_Wide_Wide_String);
 770       Set_Component_Type   (Standard_Wide_Wide_String,
 771                             Standard_Wide_Wide_Character);
 772       Set_Component_Size   (Standard_Wide_Wide_String, Uint_32);
 773       Init_Size_Align      (Standard_Wide_Wide_String);
 774       Set_Is_Ada_2005_Only (Standard_Wide_Wide_String);
 775
 776       --  Set index type of Wide_Wide_String
 777
 778       E_Id := First
 779         (Subtype_Marks (Type_Definition (Parent (Standard_Wide_Wide_String))));
 780       Set_First_Index (Standard_Wide_Wide_String, E_Id);
 781       Set_Entity (E_Id, Standard_Positive);
 782       Set_Etype (E_Id, Standard_Positive);
 783
 784       --  Setup entity for Naturalend Create_Standard;
 785
 786       Set_Ekind          (Standard_Natural, E_Signed_Integer_Subtype);
 787       Set_Etype          (Standard_Natural, Base_Type (Standard_Integer));
 788       Init_Esize         (Standard_Natural, Standard_Integer_Size);
 789       Init_RM_Size       (Standard_Natural, Standard_Integer_Size - 1);
 790       Set_Elem_Alignment (Standard_Natural);
 791       Set_Size_Known_At_Compile_Time
 792                          (Standard_Natural);
 793       Set_Integer_Bounds (Standard_Natural,
 794         Typ => Base_Type (Standard_Integer),
 795         Lb  => Uint_0,
 796         Hb  => Intval (High_Bound (Scalar_Range (Standard_Integer))));
 797       Set_Is_Constrained (Standard_Natural);
 798
 799       --  Setup entity for Positive
 800
 801       Set_Ekind          (Standard_Positive, E_Signed_Integer_Subtype);
 802       Set_Etype          (Standard_Positive, Base_Type (Standard_Integer));
 803       Init_Esize         (Standard_Positive, Standard_Integer_Size);
 804       Init_RM_Size       (Standard_Positive, Standard_Integer_Size - 1);
 805       Set_Elem_Alignment (Standard_Positive);
 806
 807       Set_Size_Known_At_Compile_Time (Standard_Positive);
 808
 809       Set_Integer_Bounds   (Standard_Positive,
 810          Typ => Base_Type (Standard_Integer),
 811          Lb  => Uint_1,
 812          Hb  => Intval (High_Bound (Scalar_Range (Standard_Integer))));
 813       Set_Is_Constrained   (Standard_Positive);
 814
 815       --  Create declaration for package ASCII
 816
 817       Decl := New_Node (N_Package_Declaration, Stloc);
 818       Append (Decl, Decl_S);
 819
 820       Pspec := New_Node (N_Package_Specification, Stloc);
 821       Set_Specification (Decl, Pspec);
 822
 823       Set_Defining_Unit_Name (Pspec, Standard_Entity (S_ASCII));
 824       Set_Ekind (Standard_Entity (S_ASCII), E_Package);
 825       Set_Visible_Declarations (Pspec, Decl_A);
 826
 827       --  Create control character definitions in package ASCII. Note that
 828       --  the character literal entries created here correspond to literal
 829       --  values that are impossible in the source, but can be represented
 830       --  internally with no difficulties.
 831
 832       Ccode := 16#00#;
 833
 834       for S in S_ASCII_Names loop
 835          Decl := New_Node (N_Object_Declaration, Staloc);
 836          Set_Constant_Present (Decl, True);
 837
 838          declare
 839             A_Char    : constant Entity_Id := Standard_Entity (S);
 840             Expr_Decl : Node_Id;
 841
 842          begin
 843             Set_Sloc                   (A_Char, Staloc);
 844             Set_Ekind                  (A_Char, E_Constant);
 845             Set_Never_Set_In_Source    (A_Char, True);
 846             Set_Is_True_Constant       (A_Char, True);
 847             Set_Etype                  (A_Char, Standard_Character);
 848             Set_Scope                  (A_Char, Standard_Entity (S_ASCII));
 849             Set_Is_Immediately_Visible (A_Char, False);
 850             Set_Is_Public              (A_Char, True);
 851             Set_Is_Known_Valid         (A_Char, True);
 852
 853             Append_Entity (A_Char, Standard_Entity (S_ASCII));
 854             Set_Defining_Identifier (Decl, A_Char);
 855
 856             Set_Object_Definition (Decl, Identifier_For (S_Character));
 857             Expr_Decl := New_Node (N_Character_Literal, Staloc);
 858             Set_Expression (Decl, Expr_Decl);
 859
 860             Set_Is_Static_Expression (Expr_Decl);
 861             Set_Chars                (Expr_Decl, No_Name);
 862             Set_Etype                (Expr_Decl, Standard_Character);
 863             Set_Char_Literal_Value   (Expr_Decl, UI_From_Int (Int (Ccode)));
 864          end;
 865
 866          Append (Decl, Decl_A);
 867
 868          --  Increment character code, dealing with non-contiguities
 869
 870          Ccode := Ccode + 1;
 871
 872          if Ccode = 16#20# then
 873             Ccode := 16#21#;
 874          elsif Ccode = 16#27# then
 875             Ccode := 16#3A#;
 876          elsif Ccode = 16#3C# then
 877             Ccode := 16#3F#;
 878          elsif Ccode = 16#41# then
 879             Ccode := 16#5B#;
 880          end if;
 881       end loop;
 882
 883       --  Create semantic phase entities
 884
 885       Standard_Void_Type := New_Standard_Entity;
 886       Set_Ekind       (Standard_Void_Type, E_Void);
 887       Set_Etype       (Standard_Void_Type, Standard_Void_Type);
 888       Set_Scope       (Standard_Void_Type, Standard_Standard);
 889       Make_Name       (Standard_Void_Type, "_void_type");
 890
 891       --  The type field of packages is set to void
 892
 893       Set_Etype (Standard_Standard, Standard_Void_Type);
 894       Set_Etype (Standard_ASCII, Standard_Void_Type);
 895
 896       --  Standard_A_String is actually used in generated code, so it has a
 897       --  type name that is reasonable, but does not overlap any Ada name.
 898
 899       Standard_A_String := New_Standard_Entity;
 900       Set_Ekind      (Standard_A_String, E_Access_Type);
 901       Set_Scope      (Standard_A_String, Standard_Standard);
 902       Set_Etype      (Standard_A_String, Standard_A_String);
 903
 904       if Debug_Flag_6 then
 905          Init_Size   (Standard_A_String, System_Address_Size);
 906       else
 907          Init_Size   (Standard_A_String, System_Address_Size * 2);
 908       end if;
 909
 910       Init_Alignment (Standard_A_String);
 911
 912       Set_Directly_Designated_Type
 913                      (Standard_A_String, Standard_String);
 914       Make_Name      (Standard_A_String, "access_string");
 915
 916       Standard_A_Char := New_Standard_Entity;
 917       Set_Ekind          (Standard_A_Char, E_Access_Type);
 918       Set_Scope          (Standard_A_Char, Standard_Standard);
 919       Set_Etype          (Standard_A_Char, Standard_A_String);
 920       Init_Size          (Standard_A_Char, System_Address_Size);
 921       Set_Elem_Alignment (Standard_A_Char);
 922
 923       Set_Directly_Designated_Type (Standard_A_Char, Standard_Character);
 924       Make_Name     (Standard_A_Char, "access_character");
 925
 926       --  Standard_Debug_Renaming_Type is used for the special objects created
 927       --  to encode the names occurring in renaming declarations for use by the
 928       --  debugger (see exp_dbug.adb). The type is a zero-sized subtype of
 929       --  Standard.Integer.
 930
 931       Standard_Debug_Renaming_Type := New_Standard_Entity;
 932
 933       Set_Ekind (Standard_Debug_Renaming_Type, E_Signed_Integer_Subtype);
 934       Set_Scope (Standard_Debug_Renaming_Type, Standard_Standard);
 935       Set_Etype (Standard_Debug_Renaming_Type, Base_Type (Standard_Integer));
 936       Init_Esize          (Standard_Debug_Renaming_Type, 0);
 937       Init_RM_Size        (Standard_Debug_Renaming_Type, 0);
 938       Set_Size_Known_At_Compile_Time (Standard_Debug_Renaming_Type);
 939       Set_Integer_Bounds  (Standard_Debug_Renaming_Type,
 940         Typ => Base_Type  (Standard_Debug_Renaming_Type),
 941         Lb  => Uint_1,
 942         Hb  => Uint_0);
 943       Set_Is_Constrained  (Standard_Debug_Renaming_Type);
 944       Set_Has_Size_Clause (Standard_Debug_Renaming_Type);
 945
 946       Make_Name           (Standard_Debug_Renaming_Type, "_renaming_type");
 947
 948       --  Note on type names. The type names for the following special types
 949       --  are constructed so that they will look reasonable should they ever
 950       --  appear in error messages etc, although in practice the use of the
 951       --  special insertion character } for types results in special handling
 952       --  of these type names in any case. The blanks in these names would
 953       --  trouble in Gigi, but that's OK here, since none of these types
 954       --  should ever get through to Gigi! Attributes of these types are
 955       --  filled out to minimize problems with cascaded errors (for example,
 956       --  Any_Integer is given reasonable and consistent type and size values)
 957
 958       Any_Type := New_Standard_Entity;
 959       Decl := New_Node (N_Full_Type_Declaration, Stloc);
 960       Set_Defining_Identifier (Decl, Any_Type);
 961       Set_Scope (Any_Type, Standard_Standard);
 962       Build_Signed_Integer_Type (Any_Type, Standard_Integer_Size);
 963       Make_Name (Any_Type, "any type");
 964
 965       Any_Id := New_Standard_Entity;
 966       Set_Ekind             (Any_Id, E_Variable);
 967       Set_Scope             (Any_Id, Standard_Standard);
 968       Set_Etype             (Any_Id, Any_Type);
 969       Init_Esize            (Any_Id);
 970       Init_Alignment        (Any_Id);
 971       Make_Name             (Any_Id, "any id");
 972
 973       Any_Access := New_Standard_Entity;
 974       Set_Ekind             (Any_Access, E_Access_Type);
 975       Set_Scope             (Any_Access, Standard_Standard);
 976       Set_Etype             (Any_Access, Any_Access);
 977       Init_Size             (Any_Access, System_Address_Size);
 978       Set_Elem_Alignment    (Any_Access);
 979       Make_Name             (Any_Access, "an access type");
 980
 981       Any_Character := New_Standard_Entity;
 982       Set_Ekind             (Any_Character, E_Enumeration_Type);
 983       Set_Scope             (Any_Character, Standard_Standard);
 984       Set_Etype             (Any_Character, Any_Character);
 985       Set_Is_Unsigned_Type  (Any_Character);
 986       Set_Is_Character_Type (Any_Character);
 987       Init_Esize            (Any_Character, Standard_Character_Size);
 988       Init_RM_Size          (Any_Character, 8);
 989       Set_Elem_Alignment    (Any_Character);
 990       Set_Scalar_Range      (Any_Character, Scalar_Range (Standard_Character));
 991       Make_Name             (Any_Character, "a character type");
 992
 993       Any_Array := New_Standard_Entity;
 994       Set_Ekind             (Any_Array, E_String_Type);
 995       Set_Scope             (Any_Array, Standard_Standard);
 996       Set_Etype             (Any_Array, Any_Array);
 997       Set_Component_Type    (Any_Array, Any_Character);
 998       Init_Size_Align       (Any_Array);
 999       Make_Name             (Any_Array, "an array type");
1000
1001       Any_Boolean := New_Standard_Entity;
1002       Set_Ekind             (Any_Boolean, E_Enumeration_Type);
1003       Set_Scope             (Any_Boolean, Standard_Standard);
1004       Set_Etype             (Any_Boolean, Standard_Boolean);
1005       Init_Esize            (Any_Boolean, Standard_Character_Size);
1006       Init_RM_Size          (Any_Boolean, 1);
1007       Set_Elem_Alignment    (Any_Boolean);
1008       Set_Is_Unsigned_Type  (Any_Boolean);
1009       Set_Scalar_Range      (Any_Boolean, Scalar_Range (Standard_Boolean));
1010       Make_Name             (Any_Boolean, "a boolean type");
1011
1012       Any_Composite := New_Standard_Entity;
1013       Set_Ekind             (Any_Composite, E_Array_Type);
1014       Set_Scope             (Any_Composite, Standard_Standard);
1015       Set_Etype             (Any_Composite, Any_Composite);
1016       Set_Component_Size    (Any_Composite, Uint_0);
1017       Set_Component_Type    (Any_Composite, Standard_Integer);
1018       Init_Size_Align       (Any_Composite);
1019       Make_Name             (Any_Composite, "a composite type");
1020
1021       Any_Discrete := New_Standard_Entity;
1022       Set_Ekind             (Any_Discrete, E_Signed_Integer_Type);
1023       Set_Scope             (Any_Discrete, Standard_Standard);
1024       Set_Etype             (Any_Discrete, Any_Discrete);
1025       Init_Size             (Any_Discrete, Standard_Integer_Size);
1026       Set_Elem_Alignment    (Any_Discrete);
1027       Make_Name             (Any_Discrete, "a discrete type");
1028
1029       Any_Fixed := New_Standard_Entity;
1030       Set_Ekind             (Any_Fixed, E_Ordinary_Fixed_Point_Type);
1031       Set_Scope             (Any_Fixed, Standard_Standard);
1032       Set_Etype             (Any_Fixed, Any_Fixed);
1033       Init_Size             (Any_Fixed, Standard_Integer_Size);
1034       Set_Elem_Alignment    (Any_Fixed);
1035       Make_Name             (Any_Fixed, "a fixed-point type");
1036
1037       Any_Integer := New_Standard_Entity;
1038       Set_Ekind             (Any_Integer, E_Signed_Integer_Type);
1039       Set_Scope             (Any_Integer, Standard_Standard);
1040       Set_Etype             (Any_Integer, Standard_Long_Long_Integer);
1041       Init_Size             (Any_Integer, Standard_Long_Long_Integer_Size);
1042       Set_Elem_Alignment    (Any_Integer);
1043
1044       Set_Integer_Bounds
1045         (Any_Integer,
1046          Typ => Base_Type (Standard_Integer),
1047          Lb  => Uint_0,
1048          Hb  => Intval (High_Bound (Scalar_Range (Standard_Integer))));
1049       Make_Name (Any_Integer, "an integer type");
1050
1051       Any_Modular := New_Standard_Entity;
1052       Set_Ekind             (Any_Modular, E_Modular_Integer_Type);
1053       Set_Scope             (Any_Modular, Standard_Standard);
1054       Set_Etype             (Any_Modular, Standard_Long_Long_Integer);
1055       Init_Size             (Any_Modular, Standard_Long_Long_Integer_Size);
1056       Set_Elem_Alignment    (Any_Modular);
1057       Set_Is_Unsigned_Type  (Any_Modular);
1058       Make_Name             (Any_Modular, "a modular type");
1059
1060       Any_Numeric := New_Standard_Entity;
1061       Set_Ekind             (Any_Numeric, E_Signed_Integer_Type);
1062       Set_Scope             (Any_Numeric, Standard_Standard);
1063       Set_Etype             (Any_Numeric, Standard_Long_Long_Integer);
1064       Init_Size             (Any_Numeric, Standard_Long_Long_Integer_Size);
1065       Set_Elem_Alignment    (Any_Numeric);
1066       Make_Name             (Any_Numeric, "a numeric type");
1067
1068       Any_Real := New_Standard_Entity;
1069       Set_Ekind             (Any_Real, E_Floating_Point_Type);
1070       Set_Scope             (Any_Real, Standard_Standard);
1071       Set_Etype             (Any_Real, Standard_Long_Long_Float);
1072       Init_Size             (Any_Real, Standard_Long_Long_Float_Size);
1073       Set_Elem_Alignment    (Any_Real);
1074       Make_Name             (Any_Real, "a real type");
1075
1076       Any_Scalar := New_Standard_Entity;
1077       Set_Ekind             (Any_Scalar, E_Signed_Integer_Type);
1078       Set_Scope             (Any_Scalar, Standard_Standard);
1079       Set_Etype             (Any_Scalar, Any_Scalar);
1080       Init_Size             (Any_Scalar, Standard_Integer_Size);
1081       Set_Elem_Alignment    (Any_Scalar);
1082       Make_Name             (Any_Scalar, "a scalar type");
1083
1084       Any_String := New_Standard_Entity;
1085       Set_Ekind             (Any_String, E_String_Type);
1086       Set_Scope             (Any_String, Standard_Standard);
1087       Set_Etype             (Any_String, Any_String);
1088       Set_Component_Type    (Any_String, Any_Character);
1089       Init_Size_Align       (Any_String);
1090       Make_Name             (Any_String, "a string type");
1091
1092       declare
1093          Index   : Node_Id;
1094
1095       begin
1096          Index :=
1097            Make_Range (Stloc,
1098              Low_Bound  => Make_Integer (Uint_0),
1099              High_Bound => Make_Integer (Uint_2 ** Standard_Integer_Size));
1100          Set_Etype (Index, Standard_Integer);
1101          Set_First_Index (Any_String, Index);
1102       end;
1103
1104       Standard_Integer_8 := New_Standard_Entity;
1105       Decl := New_Node (N_Full_Type_Declaration, Stloc);
1106       Set_Defining_Identifier (Decl, Standard_Integer_8);
1107       Make_Name (Standard_Integer_8, "integer_8");
1108       Set_Scope (Standard_Integer_8, Standard_Standard);
1109       Build_Signed_Integer_Type (Standard_Integer_8, 8);
1110
1111       Standard_Integer_16 := New_Standard_Entity;
1112       Decl := New_Node (N_Full_Type_Declaration, Stloc);
1113       Set_Defining_Identifier (Decl, Standard_Integer_16);
1114       Make_Name (Standard_Integer_16, "integer_16");
1115       Set_Scope (Standard_Integer_16, Standard_Standard);
1116       Build_Signed_Integer_Type (Standard_Integer_16, 16);
1117
1118       Standard_Integer_32 := New_Standard_Entity;
1119       Decl := New_Node (N_Full_Type_Declaration, Stloc);
1120       Set_Defining_Identifier (Decl, Standard_Integer_32);
1121       Make_Name (Standard_Integer_32, "integer_32");
1122       Set_Scope (Standard_Integer_32, Standard_Standard);
1123       Build_Signed_Integer_Type (Standard_Integer_32, 32);
1124
1125       Standard_Integer_64 := New_Standard_Entity;
1126       Decl := New_Node (N_Full_Type_Declaration, Stloc);
1127       Set_Defining_Identifier (Decl, Standard_Integer_64);
1128       Make_Name (Standard_Integer_64, "integer_64");
1129       Set_Scope (Standard_Integer_64, Standard_Standard);
1130       Build_Signed_Integer_Type (Standard_Integer_64, 64);
1131
1132       Standard_Unsigned := New_Standard_Entity;
1133       Decl := New_Node (N_Full_Type_Declaration, Stloc);
1134       Set_Defining_Identifier (Decl, Standard_Unsigned);
1135       Make_Name (Standard_Unsigned, "unsigned");
1136
1137       Set_Ekind             (Standard_Unsigned, E_Modular_Integer_Type);
1138       Set_Scope             (Standard_Unsigned, Standard_Standard);
1139       Set_Etype             (Standard_Unsigned, Standard_Unsigned);
1140       Init_Size             (Standard_Unsigned, Standard_Integer_Size);
1141       Set_Elem_Alignment    (Standard_Unsigned);
1142       Set_Modulus           (Standard_Unsigned,
1143                               Uint_2 ** Standard_Integer_Size);
1144       Set_Is_Unsigned_Type  (Standard_Unsigned);
1145       Set_Size_Known_At_Compile_Time
1146                             (Standard_Unsigned);
1147       Set_Is_Known_Valid    (Standard_Unsigned, True);
1148
1149       R_Node := New_Node (N_Range, Stloc);
1150       Set_Low_Bound  (R_Node, Make_Integer (Uint_0));
1151       Set_High_Bound (R_Node, Make_Integer (Modulus (Standard_Unsigned) - 1));
1152       Set_Etype (Low_Bound (R_Node), Standard_Unsigned);
1153       Set_Etype (High_Bound (R_Node), Standard_Unsigned);
1154       Set_Scalar_Range (Standard_Unsigned, R_Node);
1155
1156       --  Note: universal integer and universal real are constructed as fully
1157       --  formed signed numeric types, with parameters corresponding to the
1158       --  longest runtime types (Long_Long_Integer and Long_Long_Float). This
1159       --  allows Gigi to properly process references to universal types that
1160       --  are not folded at compile time.
1161
1162       Universal_Integer := New_Standard_Entity;
1163       Decl := New_Node (N_Full_Type_Declaration, Stloc);
1164       Set_Defining_Identifier (Decl, Universal_Integer);
1165       Make_Name (Universal_Integer, "universal_integer");
1166       Set_Scope (Universal_Integer, Standard_Standard);
1167       Build_Signed_Integer_Type
1168         (Universal_Integer, Standard_Long_Long_Integer_Size);
1169
1170       Universal_Real := New_Standard_Entity;
1171       Decl := New_Node (N_Full_Type_Declaration, Stloc);
1172       Set_Defining_Identifier (Decl, Universal_Real);
1173       Make_Name (Universal_Real, "universal_real");
1174       Set_Scope (Universal_Real, Standard_Standard);
1175       Build_Float_Type
1176         (Universal_Real,
1177          Standard_Long_Long_Float_Size,
1178          Standard_Long_Long_Float_Digits);
1179
1180       --  Note: universal fixed, unlike universal integer and universal real,
1181       --  is never used at runtime, so it does not need to have bounds set.
1182
1183       Universal_Fixed := New_Standard_Entity;
1184       Decl := New_Node (N_Full_Type_Declaration, Stloc);
1185       Set_Defining_Identifier (Decl, Universal_Fixed);
1186       Make_Name            (Universal_Fixed, "universal_fixed");
1187       Set_Ekind            (Universal_Fixed, E_Ordinary_Fixed_Point_Type);
1188       Set_Etype            (Universal_Fixed, Universal_Fixed);
1189       Set_Scope            (Universal_Fixed, Standard_Standard);
1190       Init_Size            (Universal_Fixed, Standard_Long_Long_Integer_Size);
1191       Set_Elem_Alignment   (Universal_Fixed);
1192       Set_Size_Known_At_Compile_Time
1193                            (Universal_Fixed);
1194
1195       --  Create type declaration for Duration, using a 64-bit size. The
1196       --  delta and size values depend on the mode set in system.ads.
1197
1198       Build_Duration : declare
1199          Dlo       : Uint;
1200          Dhi       : Uint;
1201          Delta_Val : Ureal;
1202
1203       begin
1204          --  In 32 bit mode, the size is 32 bits, and the delta and
1205          --  small values are set to 20 milliseconds (20.0**(10.0**(-3)).
1206
1207          if Duration_32_Bits_On_Target then
1208             Dlo := Intval (Type_Low_Bound (Standard_Integer_32));
1209             Dhi := Intval (Type_High_Bound (Standard_Integer_32));
1210             Delta_Val := UR_From_Components (UI_From_Int (20), Uint_3, 10);
1211
1212          --  In standard 64-bit mode, the size is 64-bits and the delta and
1213          --  small values are set to nanoseconds (1.0**(10.0**(-9))
1214
1215          else
1216             Dlo := Intval (Type_Low_Bound (Standard_Integer_64));
1217             Dhi := Intval (Type_High_Bound (Standard_Integer_64));
1218             Delta_Val := UR_From_Components (Uint_1, Uint_9, 10);
1219          end if;
1220
1221          Tdef_Node := Make_Ordinary_Fixed_Point_Definition (Stloc,
1222                  Delta_Expression => Make_Real_Literal (Stloc, Delta_Val),
1223                  Real_Range_Specification =>
1224                    Make_Real_Range_Specification (Stloc,
1225                      Low_Bound  => Make_Real_Literal (Stloc,
1226                        Realval => Dlo * Delta_Val),
1227                      High_Bound => Make_Real_Literal (Stloc,
1228                        Realval => Dhi * Delta_Val)));
1229
1230          Set_Type_Definition (Parent (Standard_Duration), Tdef_Node);
1231
1232          Set_Ekind (Standard_Duration, E_Ordinary_Fixed_Point_Type);
1233          Set_Etype (Standard_Duration, Standard_Duration);
1234
1235          if Duration_32_Bits_On_Target then
1236             Init_Size (Standard_Duration, 32);
1237          else
1238             Init_Size (Standard_Duration, 64);
1239          end if;
1240
1241          Set_Elem_Alignment (Standard_Duration);
1242          Set_Delta_Value    (Standard_Duration, Delta_Val);
1243          Set_Small_Value    (Standard_Duration, Delta_Val);
1244          Set_Scalar_Range   (Standard_Duration,
1245                               Real_Range_Specification
1246                                (Type_Definition (Parent (Standard_Duration))));
1247
1248          --  Normally it does not matter that nodes in package Standard are
1249          --  not marked as analyzed. The Scalar_Range of the fixed-point
1250          --  type Standard_Duration is an exception, because of the special
1251          --  test made in Freeze.Freeze_Fixed_Point_Type.
1252
1253          Set_Analyzed (Scalar_Range (Standard_Duration));
1254
1255          Set_Etype (Type_High_Bound (Standard_Duration), Standard_Duration);
1256          Set_Etype (Type_Low_Bound  (Standard_Duration), Standard_Duration);
1257
1258          Set_Is_Static_Expression (Type_High_Bound (Standard_Duration));
1259          Set_Is_Static_Expression (Type_Low_Bound  (Standard_Duration));
1260
1261          Set_Corresponding_Integer_Value
1262            (Type_High_Bound (Standard_Duration), Dhi);
1263
1264          Set_Corresponding_Integer_Value
1265            (Type_Low_Bound  (Standard_Duration), Dlo);
1266
1267          Set_Size_Known_At_Compile_Time (Standard_Duration);
1268       end Build_Duration;
1269
1270       --  Build standard exception type. Note that the type name here is
1271       --  actually used in the generated code, so it must be set correctly
1272
1273       --  ??? Also note that the Import_Code component is now declared
1274       --  as a System.Standard_Library.Exception_Code to enforce run-time
1275       --  library implementation consistency. It's too early here to resort
1276       --  to rtsfind to get the proper node for that type, so we use the
1277       --  closest possible available type node at hand instead. We should
1278       --  probably be fixing this up at some point.
1279
1280       Standard_Exception_Type := New_Standard_Entity;
1281       Set_Ekind       (Standard_Exception_Type, E_Record_Type);
1282       Set_Etype       (Standard_Exception_Type, Standard_Exception_Type);
1283       Set_Scope       (Standard_Exception_Type, Standard_Standard);
1284       Set_Stored_Constraint
1285                       (Standard_Exception_Type, No_Elist);
1286       Init_Size_Align (Standard_Exception_Type);
1287       Set_Size_Known_At_Compile_Time
1288                       (Standard_Exception_Type, True);
1289       Make_Name       (Standard_Exception_Type, "exception");
1290
1291       Make_Component
1292         (Standard_Exception_Type, Standard_Boolean,   "Not_Handled_By_Others");
1293       Make_Component
1294         (Standard_Exception_Type, Standard_Character, "Lang");
1295       Make_Component
1296         (Standard_Exception_Type, Standard_Natural,   "Name_Length");
1297       Make_Component
1298         (Standard_Exception_Type, Standard_A_Char,    "Full_Name");
1299       Make_Component
1300         (Standard_Exception_Type, Standard_A_Char,    "HTable_Ptr");
1301       Make_Component
1302         (Standard_Exception_Type, Standard_Unsigned,  "Import_Code");
1303       Make_Component
1304         (Standard_Exception_Type, Standard_A_Char,    "Raise_Hook");
1305
1306       --  Build tree for record declaration, for use by the back-end
1307
1308       declare
1309          Comp_List : List_Id;
1310          Comp      : Entity_Id;
1311
1312       begin
1313          Comp      := First_Entity (Standard_Exception_Type);
1314          Comp_List := New_List;
1315          while Present (Comp) loop
1316             Append (
1317               Make_Component_Declaration (Stloc,
1318                 Defining_Identifier => Comp,
1319                 Component_Definition =>
1320                   Make_Component_Definition (Stloc,
1321                     Aliased_Present    => False,
1322                     Subtype_Indication => New_Occurrence_Of (Etype (Comp),
1323                                                              Stloc))),
1324               Comp_List);
1325
1326             Next_Entity (Comp);
1327          end loop;
1328
1329          Decl := Make_Full_Type_Declaration (Stloc,
1330            Defining_Identifier => Standard_Exception_Type,
1331            Type_Definition =>
1332              Make_Record_Definition (Stloc,
1333                End_Label => Empty,
1334                Component_List =>
1335                  Make_Component_List (Stloc,
1336                    Component_Items => Comp_List)));
1337       end;
1338
1339       Append (Decl, Decl_S);
1340
1341       Layout_Type (Standard_Exception_Type);
1342
1343       --  Create declarations of standard exceptions
1344
1345       Build_Exception (S_Constraint_Error);
1346       Build_Exception (S_Program_Error);
1347       Build_Exception (S_Storage_Error);
1348       Build_Exception (S_Tasking_Error);
1349
1350       --  Numeric_Error is a normal exception in Ada 83, but in Ada 95
1351       --  it is a renaming of Constraint_Error. Is this test too early???
1352
1353       if Ada_Version = Ada_83 then
1354          Build_Exception (S_Numeric_Error);
1355
1356       else
1357          Decl := New_Node (N_Exception_Renaming_Declaration, Stloc);
1358          E_Id := Standard_Entity (S_Numeric_Error);
1359
1360          Set_Ekind          (E_Id, E_Exception);
1361          Set_Exception_Code (E_Id, Uint_0);
1362          Set_Etype          (E_Id, Standard_Exception_Type);
1363          Set_Is_Public      (E_Id);
1364          Set_Renamed_Entity (E_Id, Standard_Entity (S_Constraint_Error));
1365
1366          Set_Defining_Identifier (Decl, E_Id);
1367          Append (Decl, Decl_S);
1368
1369          Ident_Node := New_Node (N_Identifier, Stloc);
1370          Set_Chars  (Ident_Node, Chars (Standard_Entity (S_Constraint_Error)));
1371          Set_Entity (Ident_Node, Standard_Entity (S_Constraint_Error));
1372          Set_Name   (Decl, Ident_Node);
1373       end if;
1374
1375       --  Abort_Signal is an entity that does not get made visible
1376
1377       Abort_Signal := New_Standard_Entity;
1378       Set_Chars          (Abort_Signal, Name_uAbort_Signal);
1379       Set_Ekind          (Abort_Signal, E_Exception);
1380       Set_Exception_Code (Abort_Signal, Uint_0);
1381       Set_Etype          (Abort_Signal, Standard_Exception_Type);
1382       Set_Scope          (Abort_Signal, Standard_Standard);
1383       Set_Is_Public      (Abort_Signal, True);
1384       Decl :=
1385         Make_Exception_Declaration (Stloc,
1386           Defining_Identifier => Abort_Signal);
1387
1388       --  Create defining identifiers for shift operator entities. Note
1389       --  that these entities are used only for marking shift operators
1390       --  generated internally, and hence need no structure, just a name
1391       --  and a unique identity.
1392
1393       Standard_Op_Rotate_Left := New_Standard_Entity;
1394       Set_Chars (Standard_Op_Rotate_Left, Name_Rotate_Left);
1395       Set_Ekind (Standard_Op_Rotate_Left, E_Operator);
1396
1397       Standard_Op_Rotate_Right := New_Standard_Entity;
1398       Set_Chars (Standard_Op_Rotate_Right, Name_Rotate_Right);
1399       Set_Ekind (Standard_Op_Rotate_Right, E_Operator);
1400
1401       Standard_Op_Shift_Left := New_Standard_Entity;
1402       Set_Chars (Standard_Op_Shift_Left, Name_Shift_Left);
1403       Set_Ekind (Standard_Op_Shift_Left, E_Operator);
1404
1405       Standard_Op_Shift_Right := New_Standard_Entity;
1406       Set_Chars (Standard_Op_Shift_Right, Name_Shift_Right);
1407       Set_Ekind (Standard_Op_Shift_Right, E_Operator);
1408
1409       Standard_Op_Shift_Right_Arithmetic := New_Standard_Entity;
1410       Set_Chars (Standard_Op_Shift_Right_Arithmetic,
1411                                           Name_Shift_Right_Arithmetic);
1412       Set_Ekind (Standard_Op_Shift_Right_Arithmetic,
1413                                           E_Operator);
1414
1415       --  Create standard operator declarations
1416
1417       Create_Operators;
1418
1419       --  Initialize visibility table with entities in Standard
1420
1421       for E in Standard_Entity_Type loop
1422          if Ekind (Standard_Entity (E)) /= E_Operator then
1423             Set_Name_Entity_Id
1424               (Chars (Standard_Entity (E)), Standard_Entity (E));
1425             Set_Homonym (Standard_Entity (E), Empty);
1426          end if;
1427
1428          if E not in S_ASCII_Names then
1429             Set_Scope (Standard_Entity (E), Standard_Standard);
1430             Set_Is_Immediately_Visible (Standard_Entity (E));
1431          end if;
1432       end loop;
1433
1434       --  The predefined package Standard itself does not have a scope;
1435       --  it is the only entity in the system not to have one, and this
1436       --  is what identifies the package to Gigi.
1437
1438       Set_Scope (Standard_Standard, Empty);
1439
1440       --  Set global variables indicating last Id values and version
1441
1442       Last_Standard_Node_Id := Last_Node_Id;
1443       Last_Standard_List_Id := Last_List_Id;
1444
1445       --  The Error node has an Etype of Any_Type to help error recovery
1446
1447       Set_Etype (Error, Any_Type);
1448
1449       --  Print representation of standard if switch set
1450
1451       if Opt.Print_Standard then
1452          Print_Standard;
1453       end if;
1454    end Create_Standard;
1455
1456    ------------------------------------
1457    -- Create_Unconstrained_Base_Type --
1458    ------------------------------------
1459
1460    procedure Create_Unconstrained_Base_Type
1461      (E : Entity_Id;
1462       K : Entity_Kind)
1463    is
1464       New_Ent : constant Entity_Id := New_Copy (E);
1465
1466    begin
1467       Set_Ekind            (E, K);
1468       Set_Is_Constrained   (E, True);
1469       Set_Is_First_Subtype (E, True);
1470       Set_Etype            (E, New_Ent);
1471
1472       Append_Entity (New_Ent, Standard_Standard);
1473       Set_Is_Constrained (New_Ent, False);
1474       Set_Etype          (New_Ent, New_Ent);
1475       Set_Is_Known_Valid (New_Ent, True);
1476
1477       if K = E_Signed_Integer_Subtype then
1478          Set_Etype (Low_Bound  (Scalar_Range (E)), New_Ent);
1479          Set_Etype (High_Bound (Scalar_Range (E)), New_Ent);
1480       end if;
1481
1482    end Create_Unconstrained_Base_Type;
1483
1484    --------------------
1485    -- Identifier_For --
1486    --------------------
1487
1488    function Identifier_For (S : Standard_Entity_Type) return Node_Id is
1489       Ident_Node : Node_Id;
1490    begin
1491       Ident_Node := New_Node (N_Identifier, Stloc);
1492       Set_Chars (Ident_Node, Chars (Standard_Entity (S)));
1493       return Ident_Node;
1494    end Identifier_For;
1495
1496    --------------------
1497    -- Make_Component --
1498    --------------------
1499
1500    procedure Make_Component
1501      (Rec : Entity_Id;
1502       Typ : Entity_Id;
1503       Nam : String)
1504    is
1505       Id : constant Entity_Id := New_Standard_Entity;
1506
1507    begin
1508       Set_Ekind                 (Id, E_Component);
1509       Set_Etype                 (Id, Typ);
1510       Set_Scope                 (Id, Rec);
1511       Init_Component_Location   (Id);
1512
1513       Set_Original_Record_Component (Id, Id);
1514       Make_Name (Id, Nam);
1515       Append_Entity (Id, Rec);
1516    end Make_Component;
1517
1518    -----------------
1519    -- Make_Formal --
1520    -----------------
1521
1522    function Make_Formal
1523      (Typ         : Entity_Id;
1524       Formal_Name : String) return Entity_Id
1525    is
1526       Formal : Entity_Id;
1527
1528    begin
1529       Formal := New_Standard_Entity;
1530
1531       Set_Ekind     (Formal, E_In_Parameter);
1532       Set_Mechanism (Formal, Default_Mechanism);
1533       Set_Scope     (Formal, Standard_Standard);
1534       Set_Etype     (Formal, Typ);
1535       Make_Name     (Formal, Formal_Name);
1536
1537       return Formal;
1538    end Make_Formal;
1539
1540    ------------------
1541    -- Make_Integer --
1542    ------------------
1543
1544    function Make_Integer (V : Uint) return Node_Id is
1545       N : constant Node_Id := Make_Integer_Literal (Stloc, V);
1546    begin
1547       Set_Is_Static_Expression (N);
1548       return N;
1549    end Make_Integer;
1550
1551    ---------------
1552    -- Make_Name --
1553    ---------------
1554
1555    procedure Make_Name (Id : Entity_Id; Nam : String) is
1556    begin
1557       for J in 1 .. Nam'Length loop
1558          Name_Buffer (J) := Fold_Lower (Nam (Nam'First + (J - 1)));
1559       end loop;
1560
1561       Name_Len := Nam'Length;
1562       Set_Chars (Id, Name_Find);
1563    end Make_Name;
1564
1565    ------------------
1566    -- New_Operator --
1567    ------------------
1568
1569    function New_Operator (Op : Name_Id; Typ : Entity_Id) return Entity_Id is
1570       Ident_Node : Entity_Id;
1571
1572    begin
1573       Ident_Node := Make_Defining_Identifier (Stloc, Op);
1574
1575       Set_Is_Pure    (Ident_Node, True);
1576       Set_Ekind      (Ident_Node, E_Operator);
1577       Set_Etype      (Ident_Node, Typ);
1578       Set_Scope      (Ident_Node, Standard_Standard);
1579       Set_Homonym    (Ident_Node, Get_Name_Entity_Id (Op));
1580       Set_Convention (Ident_Node, Convention_Intrinsic);
1581
1582       Set_Is_Immediately_Visible   (Ident_Node, True);
1583       Set_Is_Intrinsic_Subprogram  (Ident_Node, True);
1584
1585       Set_Name_Entity_Id (Op, Ident_Node);
1586       Append_Entity (Ident_Node, Standard_Standard);
1587       return Ident_Node;
1588    end New_Operator;
1589
1590    -------------------------
1591    -- New_Standard_Entity --
1592    -------------------------
1593
1594    function New_Standard_Entity
1595      (New_Node_Kind : Node_Kind := N_Defining_Identifier) return Entity_Id
1596    is
1597       E : constant Entity_Id := New_Entity (New_Node_Kind, Stloc);
1598
1599    begin
1600       --  All standard entities are Pure and Public
1601
1602       Set_Is_Pure (E);
1603       Set_Is_Public (E);
1604
1605       --  All standard entity names are analyzed manually, and are thus
1606       --  frozen as soon as they are created.
1607
1608       Set_Is_Frozen (E);
1609
1610       --  Set debug information required for all standard types
1611
1612       Set_Needs_Debug_Info (E);
1613
1614       --  All standard entities are built with fully qualified names, so
1615       --  set the flag to prevent an abortive attempt at requalification!
1616
1617       Set_Has_Qualified_Name (E);
1618
1619       --  Return newly created entity to be completed by caller
1620
1621       return E;
1622    end New_Standard_Entity;
1623
1624    --------------------
1625    -- Print_Standard --
1626    --------------------
1627
1628    procedure Print_Standard is
1629
1630       procedure P (Item : String) renames Output.Write_Line;
1631       --  Short-hand, since we do a lot of line writes here!
1632
1633       procedure P_Int_Range (Size : Pos);
1634       --  Prints the range of an integer based on its Size
1635
1636       procedure P_Float_Range (Id : Entity_Id);
1637       --  Prints the bounds range for the given float type entity
1638
1639       -------------------
1640       -- P_Float_Range --
1641       -------------------
1642
1643       procedure P_Float_Range (Id : Entity_Id) is
1644          Digs : constant Nat := UI_To_Int (Digits_Value (Id));
1645
1646       begin
1647          Write_Str ("     range ");
1648
1649          if Vax_Float (Id) then
1650             if Digs = VAXFF_Digits then
1651                Write_Str (VAXFF_First'Universal_Literal_String);
1652                Write_Str (" .. ");
1653                Write_Str (VAXFF_Last'Universal_Literal_String);
1654
1655             elsif Digs = VAXDF_Digits then
1656                Write_Str (VAXDF_First'Universal_Literal_String);
1657                Write_Str (" .. ");
1658                Write_Str (VAXDF_Last'Universal_Literal_String);
1659
1660             else
1661                pragma Assert (Digs = VAXGF_Digits);
1662
1663                Write_Str (VAXGF_First'Universal_Literal_String);
1664                Write_Str (" .. ");
1665                Write_Str (VAXGF_Last'Universal_Literal_String);
1666             end if;
1667
1668          elsif Is_AAMP_Float (Id) then
1669             if Digs = AAMPS_Digits then
1670                Write_Str (AAMPS_First'Universal_Literal_String);
1671                Write_Str (" .. ");
1672                Write_Str (AAMPS_Last'Universal_Literal_String);
1673
1674             else
1675                pragma Assert (Digs = AAMPL_Digits);
1676                Write_Str (AAMPL_First'Universal_Literal_String);
1677                Write_Str (" .. ");
1678                Write_Str (AAMPL_Last'Universal_Literal_String);
1679             end if;
1680
1681          elsif Digs = IEEES_Digits then
1682             Write_Str (IEEES_First'Universal_Literal_String);
1683             Write_Str (" .. ");
1684             Write_Str (IEEES_Last'Universal_Literal_String);
1685
1686          elsif Digs = IEEEL_Digits then
1687             Write_Str (IEEEL_First'Universal_Literal_String);
1688             Write_Str (" .. ");
1689             Write_Str (IEEEL_Last'Universal_Literal_String);
1690
1691          else
1692             pragma Assert (Digs = IEEEX_Digits);
1693
1694             Write_Str (IEEEX_First'Universal_Literal_String);
1695             Write_Str (" .. ");
1696             Write_Str (IEEEX_Last'Universal_Literal_String);
1697          end if;
1698
1699          Write_Str (";");
1700          Write_Eol;
1701       end P_Float_Range;
1702
1703       -----------------
1704       -- P_Int_Range --
1705       -----------------
1706
1707       procedure P_Int_Range (Size : Pos) is
1708       begin
1709          Write_Str (" is range -(2 **");
1710          Write_Int (Size - 1);
1711          Write_Str (")");
1712          Write_Str (" .. +(2 **");
1713          Write_Int (Size - 1);
1714          Write_Str (" - 1);");
1715          Write_Eol;
1716       end P_Int_Range;
1717
1718    --  Start of processing for Print_Standard
1719
1720    begin
1721       P ("--  Representation of package Standard");
1722       Write_Eol;
1723       P ("--  This is not accurate Ada, since new base types cannot be ");
1724       P ("--  created, but the listing shows the target dependent");
1725       P ("--  characteristics of the Standard types for this compiler");
1726       Write_Eol;
1727
1728       P ("package Standard is");
1729       P ("pragma Pure (Standard);");
1730       Write_Eol;
1731
1732       P ("   type Boolean is (False, True);");
1733       P ("   for Boolean'Size use 1;");
1734       P ("   for Boolean use (False => 0, True => 1);");
1735       Write_Eol;
1736
1737       --  Integer types
1738
1739       Write_Str ("   type Integer");
1740       P_Int_Range (Standard_Integer_Size);
1741       Write_Str ("   for Integer'Size use ");
1742       Write_Int (Standard_Integer_Size);
1743       P (";");
1744       Write_Eol;
1745
1746       P ("   subtype Natural  is Integer range 0 .. Integer'Last;");
1747       P ("   subtype Positive is Integer range 1 .. Integer'Last;");
1748       Write_Eol;
1749
1750       Write_Str ("   type Short_Short_Integer");
1751       P_Int_Range (Standard_Short_Short_Integer_Size);
1752       Write_Str ("   for Short_Short_Integer'Size use ");
1753       Write_Int (Standard_Short_Short_Integer_Size);
1754       P (";");
1755       Write_Eol;
1756
1757       Write_Str ("   type Short_Integer");
1758       P_Int_Range (Standard_Short_Integer_Size);
1759       Write_Str ("   for Short_Integer'Size use ");
1760       Write_Int (Standard_Short_Integer_Size);
1761       P (";");
1762       Write_Eol;
1763
1764       Write_Str ("   type Long_Integer");
1765       P_Int_Range (Standard_Long_Integer_Size);
1766       Write_Str ("   for Long_Integer'Size use ");
1767       Write_Int (Standard_Long_Integer_Size);
1768       P (";");
1769       Write_Eol;
1770
1771       Write_Str ("   type Long_Long_Integer");
1772       P_Int_Range (Standard_Long_Long_Integer_Size);
1773       Write_Str ("   for Long_Long_Integer'Size use ");
1774       Write_Int (Standard_Long_Long_Integer_Size);
1775       P (";");
1776       Write_Eol;
1777
1778       --  Floating point types
1779
1780       Write_Str ("   type Short_Float is digits ");
1781       Write_Int (Standard_Short_Float_Digits);
1782       Write_Eol;
1783       P_Float_Range (Standard_Short_Float);
1784       Write_Str ("   for Short_Float'Size use ");
1785       Write_Int (Standard_Short_Float_Size);
1786       P (";");
1787       Write_Eol;
1788
1789       Write_Str ("   type Float is digits ");
1790       Write_Int (Standard_Float_Digits);
1791       Write_Eol;
1792       P_Float_Range (Standard_Float);
1793       Write_Str ("   for Float'Size use ");
1794       Write_Int (Standard_Float_Size);
1795       P (";");
1796       Write_Eol;
1797
1798       Write_Str ("   type Long_Float is digits ");
1799       Write_Int (Standard_Long_Float_Digits);
1800       Write_Eol;
1801       P_Float_Range (Standard_Long_Float);
1802       Write_Str ("   for Long_Float'Size use ");
1803       Write_Int (Standard_Long_Float_Size);
1804       P (";");
1805       Write_Eol;
1806
1807       Write_Str ("   type Long_Long_Float is digits ");
1808       Write_Int (Standard_Long_Long_Float_Digits);
1809       Write_Eol;
1810       P_Float_Range (Standard_Long_Long_Float);
1811       Write_Str ("   for Long_Long_Float'Size use ");
1812       Write_Int (Standard_Long_Long_Float_Size);
1813       P (";");
1814       Write_Eol;
1815
1816       P ("   type Character is (...)");
1817       Write_Str ("   for Character'Size use ");
1818       Write_Int (Standard_Character_Size);
1819       P (";");
1820       P ("   --  See RM A.1(35) for details of this type");
1821       Write_Eol;
1822
1823       P ("   type Wide_Character is (...)");
1824       Write_Str ("   for Wide_Character'Size use ");
1825       Write_Int (Standard_Wide_Character_Size);
1826       P (";");
1827       P ("   --  See RM A.1(36) for details of this type");
1828       Write_Eol;
1829
1830       P ("   type Wide_Wide_Character is (...)");
1831       Write_Str ("   for Wide_Wide_Character'Size use ");
1832       Write_Int (Standard_Wide_Wide_Character_Size);
1833       P (";");
1834       P ("   --  See RM A.1(36) for details of this type");
1835
1836       P ("   type String is array (Positive range <>) of Character;");
1837       P ("   pragma Pack (String);");
1838       Write_Eol;
1839
1840       P ("   type Wide_String is array (Positive range <>)" &
1841          " of Wide_Character;");
1842       P ("   pragma Pack (Wide_String);");
1843       Write_Eol;
1844
1845       P ("   type Wide_Wide_String is array (Positive range <>)" &
1846          "  of Wide_Wide_Character;");
1847       P ("   pragma Pack (Wide_Wide_String);");
1848       Write_Eol;
1849
1850       --  Here it's OK to use the Duration type of the host compiler since
1851       --  the implementation of Duration in GNAT is target independent.
1852
1853       if Duration_32_Bits_On_Target then
1854          P ("   type Duration is delta 0.020");
1855          P ("     range -((2 ** 31 - 1) * 0.020) ..");
1856          P ("           +((2 ** 31 - 1) * 0.020);");
1857          P ("   for Duration'Small use 0.020;");
1858       else
1859          P ("   type Duration is delta 0.000000001");
1860          P ("     range -((2 ** 63 - 1) * 0.000000001) ..");
1861          P ("           +((2 ** 63 - 1) * 0.000000001);");
1862          P ("   for Duration'Small use 0.000000001;");
1863       end if;
1864
1865       Write_Eol;
1866
1867       P ("   Constraint_Error : exception;");
1868       P ("   Program_Error    : exception;");
1869       P ("   Storage_Error    : exception;");
1870       P ("   Tasking_Error    : exception;");
1871       P ("   Numeric_Error    : exception renames Constraint_Error;");
1872       Write_Eol;
1873
1874       P ("end Standard;");
1875    end Print_Standard;
1876
1877    ----------------------
1878    -- Set_Float_Bounds --
1879    ----------------------
1880
1881    procedure Set_Float_Bounds (Id  : Entity_Id) is
1882       L  : Node_Id;
1883       --  Low bound of literal value
1884
1885       H  : Node_Id;
1886       --  High bound of literal value
1887
1888       R  : Node_Id;
1889       --  Range specification
1890
1891       Digs  : constant Nat := UI_To_Int (Digits_Value (Id));
1892       --  Digits value, used to select bounds
1893
1894    begin
1895       --  Note: for the call from Cstand to initially create the types in
1896       --  Standard, Vax_Float will always be False. Circuitry in Sem_Vfpt
1897       --  will adjust these types appropriately in the Vax_Float case if
1898       --  a pragma Float_Representation (VAX_Float) is used.
1899
1900       if Vax_Float (Id) then
1901          if Digs = VAXFF_Digits then
1902             L := Real_Convert
1903                    (VAXFF_First'Universal_Literal_String);
1904             H := Real_Convert
1905                    (VAXFF_Last'Universal_Literal_String);
1906
1907          elsif Digs = VAXDF_Digits then
1908             L := Real_Convert
1909                    (VAXDF_First'Universal_Literal_String);
1910             H := Real_Convert
1911                    (VAXDF_Last'Universal_Literal_String);
1912
1913          else
1914             pragma Assert (Digs = VAXGF_Digits);
1915
1916             L := Real_Convert
1917                    (VAXGF_First'Universal_Literal_String);
1918             H := Real_Convert
1919                    (VAXGF_Last'Universal_Literal_String);
1920          end if;
1921
1922       elsif Is_AAMP_Float (Id) then
1923          if Digs = AAMPS_Digits then
1924             L := Real_Convert
1925                    (AAMPS_First'Universal_Literal_String);
1926             H := Real_Convert
1927                    (AAMPS_Last'Universal_Literal_String);
1928
1929          else
1930             pragma Assert (Digs = AAMPL_Digits);
1931             L := Real_Convert
1932                    (AAMPL_First'Universal_Literal_String);
1933             H := Real_Convert
1934                    (AAMPL_Last'Universal_Literal_String);
1935          end if;
1936
1937       elsif Digs = IEEES_Digits then
1938          L := Real_Convert
1939                 (IEEES_First'Universal_Literal_String);
1940          H := Real_Convert
1941                 (IEEES_Last'Universal_Literal_String);
1942
1943       elsif Digs = IEEEL_Digits then
1944          L := Real_Convert
1945                 (IEEEL_First'Universal_Literal_String);
1946          H := Real_Convert
1947                 (IEEEL_Last'Universal_Literal_String);
1948
1949       else
1950          pragma Assert (Digs = IEEEX_Digits);
1951
1952          L := Real_Convert
1953                 (IEEEX_First'Universal_Literal_String);
1954          H := Real_Convert
1955                 (IEEEX_Last'Universal_Literal_String);
1956       end if;
1957
1958       Set_Etype                (L, Id);
1959       Set_Is_Static_Expression (L);
1960
1961       Set_Etype                (H, Id);
1962       Set_Is_Static_Expression (H);
1963
1964       R := New_Node (N_Range, Stloc);
1965       Set_Low_Bound  (R, L);
1966       Set_High_Bound (R, H);
1967       Set_Includes_Infinities (R, True);
1968       Set_Scalar_Range (Id, R);
1969       Set_Etype (R, Id);
1970       Set_Parent (R, Id);
1971    end Set_Float_Bounds;
1972
1973    ------------------------
1974    -- Set_Integer_Bounds --
1975    ------------------------
1976
1977    procedure Set_Integer_Bounds
1978      (Id  : Entity_Id;
1979       Typ : Entity_Id;
1980       Lb  : Uint;
1981       Hb  : Uint)
1982    is
1983       L : Node_Id;     -- Low bound of literal value
1984       H : Node_Id;     -- High bound of literal value
1985       R : Node_Id;     -- Range specification
1986
1987    begin
1988       L := Make_Integer (Lb);
1989       H := Make_Integer (Hb);
1990
1991       Set_Etype (L, Typ);
1992       Set_Etype (H, Typ);
1993
1994       R := New_Node (N_Range, Stloc);
1995       Set_Low_Bound  (R, L);
1996       Set_High_Bound (R, H);
1997       Set_Scalar_Range (Id, R);
1998       Set_Etype (R, Typ);
1999       Set_Parent (R, Id);
2000       Set_Is_Unsigned_Type (Id, Lb >= 0);
2001    end Set_Integer_Bounds;
2002
2003 end CStand;