gcc/ada/stand.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                                S T A N D                                 --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2001 Free Software Foundation, Inc.          --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  19 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  20 -- MA 02111-1307, USA.                                                      --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 --  This package contains the declarations of entities in package Standard,
  35 --  These values are initialized either by calling CStand.Create_Standard,
  36 --  or by calling Stand.Tree_Read.
  37
  38 with Types; use Types;
  39
  40 --  Do we really need the with of Namet?
  41
  42 pragma Warnings (Off);
  43 with Namet; use Namet;
  44 pragma Elaborate_All (Namet);
  45 pragma Warnings (On);
  46
  47 package Stand is
  48
  49    type Standard_Entity_Type is (
  50    --  This enumeration type contains an entry for each name in Standard
  51
  52       --  Package names
  53
  54       S_Standard,
  55       S_ASCII,
  56
  57       --  Types defined in package Standard
  58
  59       S_Boolean,
  60       S_Character,
  61       S_Wide_Character,
  62       S_String,
  63       S_Wide_String,
  64       S_Duration,
  65
  66       S_Short_Short_Integer,
  67       S_Short_Integer,
  68       S_Integer,
  69       S_Long_Integer,
  70       S_Long_Long_Integer,
  71
  72       S_Short_Float,
  73       S_Float,
  74       S_Long_Float,
  75       S_Long_Long_Float,
  76
  77       --  Enumeration literals for type Boolean
  78
  79       S_False,
  80       S_True,
  81
  82       --  Subtypes declared in package Standard
  83
  84       S_Natural,
  85       S_Positive,
  86
  87       --  Exceptions declared in package Standard
  88
  89       S_Constraint_Error,
  90       S_Numeric_Error,
  91       S_Program_Error,
  92       S_Storage_Error,
  93       S_Tasking_Error,
  94
  95       --  Binary Operators declared in package Standard.
  96
  97       S_Op_Add,
  98       S_Op_And,
  99       S_Op_Concat,
 100       S_Op_Concatw,
 101       S_Op_Divide,
 102       S_Op_Eq,
 103       S_Op_Expon,
 104       S_Op_Ge,
 105       S_Op_Gt,
 106       S_Op_Le,
 107       S_Op_Lt,
 108       S_Op_Mod,
 109       S_Op_Multiply,
 110       S_Op_Ne,
 111       S_Op_Or,
 112       S_Op_Rem,
 113       S_Op_Subtract,
 114       S_Op_Xor,
 115
 116       --  Unary operators declared in package Standard
 117
 118       S_Op_Abs,
 119       S_Op_Minus,
 120       S_Op_Not,
 121       S_Op_Plus,
 122
 123       --  Constants defined in package ASCII (with value in hex).
 124       --  First the thirty-two C0 control characters)
 125
 126       S_NUL,            -- 16#00#
 127       S_SOH,            -- 16#01#
 128       S_STX,            -- 16#02#
 129       S_ETX,            -- 16#03#
 130       S_EOT,            -- 16#04#
 131       S_ENQ,            -- 16#05#
 132       S_ACK,            -- 16#06#
 133       S_BEL,            -- 16#07#
 134       S_BS,             -- 16#08#
 135       S_HT,             -- 16#09#
 136       S_LF,             -- 16#0A#
 137       S_VT,             -- 16#0B#
 138       S_FF,             -- 16#0C#
 139       S_CR,             -- 16#0D#
 140       S_SO,             -- 16#0E#
 141       S_SI,             -- 16#0F#
 142       S_DLE,            -- 16#10#
 143       S_DC1,            -- 16#11#
 144       S_DC2,            -- 16#12#
 145       S_DC3,            -- 16#13#
 146       S_DC4,            -- 16#14#
 147       S_NAK,            -- 16#15#
 148       S_SYN,            -- 16#16#
 149       S_ETB,            -- 16#17#
 150       S_CAN,            -- 16#18#
 151       S_EM,             -- 16#19#
 152       S_SUB,            -- 16#1A#
 153       S_ESC,            -- 16#1B#
 154       S_FS,             -- 16#1C#
 155       S_GS,             -- 16#1D#
 156       S_RS,             -- 16#1E#
 157       S_US,             -- 16#1F#
 158
 159       --  Here are the ones for Colonel Whitaker's O26 keypunch!
 160
 161       S_Exclam,         -- 16#21#
 162       S_Quotation,      -- 16#22#
 163       S_Sharp,          -- 16#23#
 164       S_Dollar,         -- 16#24#
 165       S_Percent,        -- 16#25#
 166       S_Ampersand,      -- 16#26#
 167
 168       S_Colon,          -- 16#3A#
 169       S_Semicolon,      -- 16#3B#
 170
 171       S_Query,          -- 16#3F#
 172       S_At_Sign,        -- 16#40#
 173
 174       S_L_Bracket,      -- 16#5B#
 175       S_Back_Slash,     -- 16#5C#
 176       S_R_Bracket,      -- 16#5D#
 177       S_Circumflex,     -- 16#5E#
 178       S_Underline,      -- 16#5F#
 179       S_Grave,          -- 16#60#
 180
 181       S_LC_A,           -- 16#61#
 182       S_LC_B,           -- 16#62#
 183       S_LC_C,           -- 16#63#
 184       S_LC_D,           -- 16#64#
 185       S_LC_E,           -- 16#65#
 186       S_LC_F,           -- 16#66#
 187       S_LC_G,           -- 16#67#
 188       S_LC_H,           -- 16#68#
 189       S_LC_I,           -- 16#69#
 190       S_LC_J,           -- 16#6A#
 191       S_LC_K,           -- 16#6B#
 192       S_LC_L,           -- 16#6C#
 193       S_LC_M,           -- 16#6D#
 194       S_LC_N,           -- 16#6E#
 195       S_LC_O,           -- 16#6F#
 196       S_LC_P,           -- 16#70#
 197       S_LC_Q,           -- 16#71#
 198       S_LC_R,           -- 16#72#
 199       S_LC_S,           -- 16#73#
 200       S_LC_T,           -- 16#74#
 201       S_LC_U,           -- 16#75#
 202       S_LC_V,           -- 16#76#
 203       S_LC_W,           -- 16#77#
 204       S_LC_X,           -- 16#78#
 205       S_LC_Y,           -- 16#79#
 206       S_LC_Z,           -- 16#7A#
 207
 208       S_L_BRACE,        -- 16#7B#
 209       S_BAR,            -- 16#7C#
 210       S_R_BRACE,        -- 16#7D#
 211       S_TILDE,          -- 16#7E#
 212
 213       --  And one more control character, all on its own
 214
 215       S_DEL);           -- 16#7F#
 216
 217    subtype S_Types is
 218      Standard_Entity_Type range S_Boolean .. S_Long_Long_Float;
 219
 220    subtype S_Exceptions is
 221      Standard_Entity_Type range S_Constraint_Error .. S_Tasking_Error;
 222
 223    subtype S_ASCII_Names is
 224      Standard_Entity_Type range S_NUL .. S_DEL;
 225
 226    subtype S_Binary_Ops is
 227       Standard_Entity_Type range S_Op_Add .. S_Op_Xor;
 228
 229    subtype S_Unary_Ops is
 230       Standard_Entity_Type range S_Op_Abs .. S_Op_Plus;
 231
 232    type Standard_Entity_Array_Type is array (Standard_Entity_Type) of Node_Id;
 233
 234    Standard_Entity : Standard_Entity_Array_Type;
 235    --  This array contains pointers to the Defining Identifier nodes
 236    --  for each of the entities defined in Standard_Entities_Type. It
 237    --  is initialized by the Create_Standard procedure.
 238
 239    Standard_Package_Node : Node_Id;
 240    --  Points to the N_Package_Declaration node for standard. Also
 241    --  initialized by the Create_Standard procedure.
 242
 243    --  The following Entities are the pointers to the Defining Identifier
 244    --  nodes for some visible entities defined in Standard_Entities_Type.
 245
 246    SE : Standard_Entity_Array_Type renames Standard_Entity;
 247
 248    Standard_Standard            : Entity_Id renames SE (S_Standard);
 249
 250    Standard_ASCII               : Entity_Id renames SE (S_ASCII);
 251    Standard_Character           : Entity_Id renames SE (S_Character);
 252    Standard_Wide_Character      : Entity_Id renames SE (S_Wide_Character);
 253    Standard_String              : Entity_Id renames SE (S_String);
 254    Standard_Wide_String         : Entity_Id renames SE (S_Wide_String);
 255
 256    Standard_Boolean             : Entity_Id renames SE (S_Boolean);
 257    Standard_False               : Entity_Id renames SE (S_False);
 258    Standard_True                : Entity_Id renames SE (S_True);
 259
 260    Standard_Duration            : Entity_Id renames SE (S_Duration);
 261
 262    Standard_Natural             : Entity_Id renames SE (S_Natural);
 263    Standard_Positive            : Entity_Id renames SE (S_Positive);
 264
 265    Standard_Constraint_Error    : Entity_Id renames SE (S_Constraint_Error);
 266    Standard_Numeric_Error       : Entity_Id renames SE (S_Numeric_Error);
 267    Standard_Program_Error       : Entity_Id renames SE (S_Program_Error);
 268    Standard_Storage_Error       : Entity_Id renames SE (S_Storage_Error);
 269    Standard_Tasking_Error       : Entity_Id renames SE (S_Tasking_Error);
 270
 271    Standard_Short_Float         : Entity_Id renames SE (S_Short_Float);
 272    Standard_Float               : Entity_Id renames SE (S_Float);
 273    Standard_Long_Float          : Entity_Id renames SE (S_Long_Float);
 274    Standard_Long_Long_Float     : Entity_Id renames SE (S_Long_Long_Float);
 275
 276    Standard_Short_Short_Integer : Entity_Id renames SE (S_Short_Short_Integer);
 277    Standard_Short_Integer       : Entity_Id renames SE (S_Short_Integer);
 278    Standard_Integer             : Entity_Id renames SE (S_Integer);
 279    Standard_Long_Integer        : Entity_Id renames SE (S_Long_Integer);
 280    Standard_Long_Long_Integer   : Entity_Id renames SE (S_Long_Long_Integer);
 281
 282    Standard_Op_Add              : Entity_Id renames SE (S_Op_Add);
 283    Standard_Op_And              : Entity_Id renames SE (S_Op_And);
 284    Standard_Op_Concat           : Entity_Id renames SE (S_Op_Concat);
 285    Standard_Op_Concatw          : Entity_Id renames SE (S_Op_Concatw);
 286    Standard_Op_Divide           : Entity_Id renames SE (S_Op_Divide);
 287    Standard_Op_Eq               : Entity_Id renames SE (S_Op_Eq);
 288    Standard_Op_Expon            : Entity_Id renames SE (S_Op_Expon);
 289    Standard_Op_Ge               : Entity_Id renames SE (S_Op_Ge);
 290    Standard_Op_Gt               : Entity_Id renames SE (S_Op_Gt);
 291    Standard_Op_Le               : Entity_Id renames SE (S_Op_Le);
 292    Standard_Op_Lt               : Entity_Id renames SE (S_Op_Lt);
 293    Standard_Op_Mod              : Entity_Id renames SE (S_Op_Mod);
 294    Standard_Op_Multiply         : Entity_Id renames SE (S_Op_Multiply);
 295    Standard_Op_Ne               : Entity_Id renames SE (S_Op_Ne);
 296    Standard_Op_Or               : Entity_Id renames SE (S_Op_Or);
 297    Standard_Op_Rem              : Entity_Id renames SE (S_Op_Rem);
 298    Standard_Op_Subtract         : Entity_Id renames SE (S_Op_Subtract);
 299    Standard_Op_Xor              : Entity_Id renames SE (S_Op_Xor);
 300
 301    Standard_Op_Abs              : Entity_Id renames SE (S_Op_Abs);
 302    Standard_Op_Minus            : Entity_Id renames SE (S_Op_Minus);
 303    Standard_Op_Not              : Entity_Id renames SE (S_Op_Not);
 304    Standard_Op_Plus             : Entity_Id renames SE (S_Op_Plus);
 305
 306    Last_Standard_Node_Id : Node_Id;
 307    --  Highest Node_Id value used by Standard
 308
 309    Last_Standard_List_Id : List_Id;
 310    --  Highest List_Id value used by Standard (including those used by
 311    --  normal list headers, element list headers, and list elements)
 312
 313    -------------------------------------
 314    -- Semantic Phase Special Entities --
 315    -------------------------------------
 316
 317    --  The semantic phase needs a number of entities for internal processing
 318    --  that are logically at the level of Standard, and hence defined in this
 319    --  package. However, they are never visible to a program, and are not
 320    --  chained on to the Decls list of Standard. The names of all these
 321    --  types are relevant only in certain debugging and error message
 322    --  situations. They have names that are suitable for use in such
 323    --  error messages (see body for actual names used).
 324
 325    Standard_Void_Type  : Entity_Id;
 326    --  This is a type used to represent the return type of procedures
 327
 328    Standard_Exception_Type  : Entity_Id;
 329    --  This is a type used to represent the Etype of exceptions.
 330
 331    Standard_A_String   : Entity_Id;
 332    --  An access to String type used for building elements of tables
 333    --  carrying the enumeration literal names.
 334
 335    Standard_A_Char : Entity_Id;
 336    --  Access to character, used as a component of the exception type to
 337    --  denote a thin pointer component.
 338
 339    --  The entities labeled Any_xxx are used in situations where the full
 340    --  characteristics of an entity are not yet known, e.g. Any_Character
 341    --  is used to label a character literal before resolution is complete.
 342    --  These entities are also used to construct appropriate references in
 343    --  error messages ("expecting an integer type").
 344
 345    Any_Id : Entity_Id;
 346    --  Used to represent some unknown identifier. Used to lable undefined
 347    --  identifier references to prevent cascaded errors.
 348
 349    Any_Type : Entity_Id;
 350    --  Used to represent some unknown type. Plays an important role in
 351    --  avoiding cascaded errors, since any node that remains labaled with
 352    --  this type corresponds to an already issued error message. Any_Type
 353    --  is propagated to avoid cascaded errors from a single type error.
 354
 355    Any_Access : Entity_Id;
 356    --  Used to resolve the overloaded literal NULL.
 357
 358    Any_Array : Entity_Id;
 359    --  Used to represent some unknown array type
 360
 361    Any_Boolean : Entity_Id;
 362    --  The context type of conditions in IF and WHILE statements.
 363
 364    Any_Character : Entity_Id;
 365    --  Any_Character is used to label character literals, which in general
 366    --  will not have an explicit declaration (this is true of the predefined
 367    --  character types).
 368
 369    Any_Composite : Entity_Id;
 370    --  The type Any_Composite is used for aggregates before type resolution.
 371    --  It is compatible with any array or non-limited record type.
 372
 373    Any_Discrete : Entity_Id;
 374    --  Used to represent some unknown discrete type
 375
 376    Any_Fixed : Entity_Id;
 377    --  Used to represent some unknown fixed-point type
 378
 379    Any_Integer : Entity_Id;
 380    --  Used to represent some unknown integer type.
 381
 382    Any_Modular : Entity_Id;
 383    --  Used to represent the result type of a boolean operation on an
 384    --  integer literal. The result is not Universal_Integer, because it is
 385    --  only legal in a modular context.
 386
 387    Any_Numeric : Entity_Id;
 388    --  Used to represent some unknown numeric type.
 389
 390    Any_Real : Entity_Id;
 391    --  Used to represent some unknown real type.
 392
 393    Any_Scalar : Entity_Id;
 394    --  Used to represent some unknown scalar type
 395
 396    Any_String : Entity_Id;
 397    --  The type Any_String is used for string literals before type
 398    --  resolution. It corresponds to array (Positive range <>) of character
 399    --  where the component type is compatible with any character type,
 400    --  not just Standard_Character.
 401
 402    Universal_Integer : Entity_Id;
 403    --  Entity for universal integer type. The bounds of this type correspond
 404    --  to the largest supported integer type (i.e. Long_Long_Integer). It is
 405    --  the type used for runtime calculations in type universal integer.
 406
 407    Universal_Real : Entity_Id;
 408    --  Entity for universal real type. The bounds of this type correspond to
 409    --  to the largest supported real type (i.e. Long_Long_Real). It is the
 410    --  type used for runtime calculations in type universal real.
 411
 412    Universal_Fixed : Entity_Id;
 413    --  Entity for universal fixed type. This is a type with  arbitrary
 414    --  precision that can only appear in  a context with a specific type.
 415    --  Universal_Fixed labels the result of multiplication or division of
 416    --  two fixed point numbers, and has no specified bounds (since, unlike
 417    --  universal integer and universal real, it is never used for runtime
 418    --  calculations).
 419
 420    Standard_Integer_8  : Entity_Id;
 421    Standard_Integer_16 : Entity_Id;
 422    Standard_Integer_32 : Entity_Id;
 423    Standard_Integer_64 : Entity_Id;
 424    --  These are signed integer types with the indicated sizes, They are
 425    --  used for the underlying implementation types for fixed-point and
 426    --  enumeration types.
 427
 428    Standard_Unsigned : Entity_Id;
 429    --  An unsigned type of the same size as Standard_Integer
 430
 431    Abort_Signal : Entity_Id;
 432    --  Entity for abort signal exception
 433
 434    Standard_Op_Rotate_Left            : Entity_Id;
 435    Standard_Op_Rotate_Right           : Entity_Id;
 436    Standard_Op_Shift_Left             : Entity_Id;
 437    Standard_Op_Shift_Right            : Entity_Id;
 438    Standard_Op_Shift_Right_Arithmetic : Entity_Id;
 439    --  These entities are used for shift operators generated by the expander
 440
 441    -----------------
 442    -- Subprograms --
 443    -----------------
 444
 445    procedure Tree_Read;
 446    --  Initializes entity values in this package from the current tree
 447    --  file using Osint.Tree_Read. Note that Tree_Read includes all the
 448    --  initialization that is carried out by Create_Standard.
 449
 450    procedure Tree_Write;
 451    --  Writes out the entity values in this package to the current
 452    --  tree file using Osint.Tree_Write.
 453
 454 end Stand;