gcc/ada/s-auxdec.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                       S Y S T E M . A U X _ D E C                        --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1996-2010, 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.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNAT was originally developed  by the GNAT team at  New York University. --
  28 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 --  This package contains definitions that are designed to be compatible
  33 --  with the extra definitions in package System for DEC Ada implementations.
  34
  35 --  These definitions can be used directly by withing this package, or merged
  36 --  with System using pragma Extend_System (Aux_DEC)
  37
  38 with Ada.Unchecked_Conversion;
  39
  40 package System.Aux_DEC is
  41    pragma Preelaborate;
  42
  43    subtype Short_Address is Address;
  44    --  In some versions of System.Aux_DEC, notably that for VMS on IA64, there
  45    --  are two address types (64-bit and 32-bit), and the name Short_Address
  46    --  is used for the short address form. To avoid difficulties (in regression
  47    --  tests and elsewhere) with units that reference Short_Address, it is
  48    --  provided for other targets as a synonym for the normal Address type,
  49    --  and, as in the case where the lengths are different, Address and
  50    --  Short_Address can be freely inter-converted.
  51
  52    type Integer_8  is range -2 **  (8 - 1) .. +2 **  (8 - 1) - 1;
  53    for Integer_8'Size  use  8;
  54
  55    type Integer_16 is range -2 ** (16 - 1) .. +2 ** (16 - 1) - 1;
  56    for Integer_16'Size use 16;
  57
  58    type Integer_32 is range -2 ** (32 - 1) .. +2 ** (32 - 1) - 1;
  59    for Integer_32'Size use 32;
  60
  61    type Integer_64 is range -2 ** (64 - 1) .. +2 ** (64 - 1) - 1;
  62    for Integer_64'Size use 64;
  63
  64    type Integer_8_Array  is array (Integer range <>) of Integer_8;
  65    type Integer_16_Array is array (Integer range <>) of Integer_16;
  66    type Integer_32_Array is array (Integer range <>) of Integer_32;
  67    type Integer_64_Array is array (Integer range <>) of Integer_64;
  68    --  These array types are not in all versions of DEC System, and in fact it
  69    --  is not quite clear why they are in some and not others, but since they
  70    --  definitely appear in some versions, we include them unconditionally.
  71
  72    type Largest_Integer is range Min_Int .. Max_Int;
  73
  74    type AST_Handler is private;
  75
  76    No_AST_Handler : constant AST_Handler;
  77
  78    type Type_Class is
  79      (Type_Class_Enumeration,
  80       Type_Class_Integer,
  81       Type_Class_Fixed_Point,
  82       Type_Class_Floating_Point,
  83       Type_Class_Array,
  84       Type_Class_Record,
  85       Type_Class_Access,
  86       Type_Class_Task,             -- also in Ada 95 protected
  87       Type_Class_Address);
  88
  89    function "not" (Left        : Largest_Integer) return Largest_Integer;
  90    function "and" (Left, Right : Largest_Integer) return Largest_Integer;
  91    function "or"  (Left, Right : Largest_Integer) return Largest_Integer;
  92    function "xor" (Left, Right : Largest_Integer) return Largest_Integer;
  93
  94    Address_Zero       : constant Address;
  95    No_Addr            : constant Address;
  96    Address_Size       : constant := Standard'Address_Size;
  97    Short_Address_Size : constant := Standard'Address_Size;
  98
  99    function "+" (Left : Address; Right : Integer) return Address;
 100    function "+" (Left : Integer; Right : Address) return Address;
 101    function "-" (Left : Address; Right : Address) return Integer;
 102    function "-" (Left : Address; Right : Integer) return Address;
 103
 104    generic
 105       type Target is private;
 106    function Fetch_From_Address (A : Address) return Target;
 107
 108    generic
 109       type Target is private;
 110    procedure Assign_To_Address (A : Address; T : Target);
 111
 112    --  Floating point type declarations for VAX floating point data types
 113
 114    pragma Warnings (Off);
 115    --  ??? needs comment
 116
 117    type F_Float is digits 6;
 118    pragma Float_Representation (VAX_Float, F_Float);
 119
 120    type D_Float is digits 9;
 121    pragma Float_Representation (Vax_Float, D_Float);
 122
 123    type G_Float is digits 15;
 124    pragma Float_Representation (Vax_Float, G_Float);
 125
 126    --  Floating point type declarations for IEEE floating point data types
 127
 128    type IEEE_Single_Float is digits 6;
 129    pragma Float_Representation (IEEE_Float, IEEE_Single_Float);
 130
 131    type IEEE_Double_Float is digits 15;
 132    pragma Float_Representation (IEEE_Float, IEEE_Double_Float);
 133
 134    pragma Warnings (On);
 135
 136    Non_Ada_Error : exception;
 137
 138    --  Hardware-oriented types and functions
 139
 140    type Bit_Array is array (Integer range <>) of Boolean;
 141    pragma Pack (Bit_Array);
 142
 143    subtype Bit_Array_8  is Bit_Array (0 ..  7);
 144    subtype Bit_Array_16 is Bit_Array (0 .. 15);
 145    subtype Bit_Array_32 is Bit_Array (0 .. 31);
 146    subtype Bit_Array_64 is Bit_Array (0 .. 63);
 147
 148    type Unsigned_Byte is range 0 .. 255;
 149    for  Unsigned_Byte'Size use 8;
 150
 151    function "not" (Left        : Unsigned_Byte) return Unsigned_Byte;
 152    function "and" (Left, Right : Unsigned_Byte) return Unsigned_Byte;
 153    function "or"  (Left, Right : Unsigned_Byte) return Unsigned_Byte;
 154    function "xor" (Left, Right : Unsigned_Byte) return Unsigned_Byte;
 155
 156    function To_Unsigned_Byte (X : Bit_Array_8) return Unsigned_Byte;
 157    function To_Bit_Array_8   (X : Unsigned_Byte) return Bit_Array_8;
 158
 159    type Unsigned_Byte_Array is array (Integer range <>) of Unsigned_Byte;
 160
 161    type Unsigned_Word is range 0 .. 65535;
 162    for  Unsigned_Word'Size use 16;
 163
 164    function "not" (Left        : Unsigned_Word) return Unsigned_Word;
 165    function "and" (Left, Right : Unsigned_Word) return Unsigned_Word;
 166    function "or"  (Left, Right : Unsigned_Word) return Unsigned_Word;
 167    function "xor" (Left, Right : Unsigned_Word) return Unsigned_Word;
 168
 169    function To_Unsigned_Word (X : Bit_Array_16) return Unsigned_Word;
 170    function To_Bit_Array_16  (X : Unsigned_Word) return Bit_Array_16;
 171
 172    type Unsigned_Word_Array is array (Integer range <>) of Unsigned_Word;
 173
 174    type Unsigned_Longword is range -2_147_483_648 .. 2_147_483_647;
 175    for  Unsigned_Longword'Size use 32;
 176
 177    function "not" (Left        : Unsigned_Longword) return Unsigned_Longword;
 178    function "and" (Left, Right : Unsigned_Longword) return Unsigned_Longword;
 179    function "or"  (Left, Right : Unsigned_Longword) return Unsigned_Longword;
 180    function "xor" (Left, Right : Unsigned_Longword) return Unsigned_Longword;
 181
 182    function To_Unsigned_Longword (X : Bit_Array_32) return Unsigned_Longword;
 183    function To_Bit_Array_32 (X : Unsigned_Longword) return Bit_Array_32;
 184
 185    type Unsigned_Longword_Array is
 186       array (Integer range <>) of Unsigned_Longword;
 187
 188    type Unsigned_32 is range 0 .. 4_294_967_295;
 189    for  Unsigned_32'Size use 32;
 190
 191    function "not" (Left        : Unsigned_32) return Unsigned_32;
 192    function "and" (Left, Right : Unsigned_32) return Unsigned_32;
 193    function "or"  (Left, Right : Unsigned_32) return Unsigned_32;
 194    function "xor" (Left, Right : Unsigned_32) return Unsigned_32;
 195
 196    function To_Unsigned_32 (X : Bit_Array_32) return Unsigned_32;
 197    function To_Bit_Array_32 (X : Unsigned_32) return Bit_Array_32;
 198
 199    type Unsigned_Quadword is record
 200       L0 : Unsigned_Longword;
 201       L1 : Unsigned_Longword;
 202    end record;
 203
 204    for Unsigned_Quadword'Size      use 64;
 205    for Unsigned_Quadword'Alignment use
 206      Integer'Min (8, Standard'Maximum_Alignment);
 207
 208    function "not" (Left        : Unsigned_Quadword) return Unsigned_Quadword;
 209    function "and" (Left, Right : Unsigned_Quadword) return Unsigned_Quadword;
 210    function "or"  (Left, Right : Unsigned_Quadword) return Unsigned_Quadword;
 211    function "xor" (Left, Right : Unsigned_Quadword) return Unsigned_Quadword;
 212
 213    function To_Unsigned_Quadword (X : Bit_Array_64) return Unsigned_Quadword;
 214    function To_Bit_Array_64 (X : Unsigned_Quadword) return Bit_Array_64;
 215
 216    type Unsigned_Quadword_Array is
 217       array (Integer range <>) of Unsigned_Quadword;
 218
 219    function To_Address (X : Integer) return Address;
 220    pragma Pure_Function (To_Address);
 221
 222    function To_Address_Long (X : Unsigned_Longword) return Address;
 223    pragma Pure_Function (To_Address_Long);
 224
 225    function To_Integer (X : Address) return Integer;
 226
 227    function To_Unsigned_Longword (X : Address)     return Unsigned_Longword;
 228    function To_Unsigned_Longword (X : AST_Handler) return Unsigned_Longword;
 229
 230    --  Conventional names for static subtypes of type UNSIGNED_LONGWORD
 231
 232    subtype Unsigned_1  is Unsigned_Longword range 0 .. 2** 1-1;
 233    subtype Unsigned_2  is Unsigned_Longword range 0 .. 2** 2-1;
 234    subtype Unsigned_3  is Unsigned_Longword range 0 .. 2** 3-1;
 235    subtype Unsigned_4  is Unsigned_Longword range 0 .. 2** 4-1;
 236    subtype Unsigned_5  is Unsigned_Longword range 0 .. 2** 5-1;
 237    subtype Unsigned_6  is Unsigned_Longword range 0 .. 2** 6-1;
 238    subtype Unsigned_7  is Unsigned_Longword range 0 .. 2** 7-1;
 239    subtype Unsigned_8  is Unsigned_Longword range 0 .. 2** 8-1;
 240    subtype Unsigned_9  is Unsigned_Longword range 0 .. 2** 9-1;
 241    subtype Unsigned_10 is Unsigned_Longword range 0 .. 2**10-1;
 242    subtype Unsigned_11 is Unsigned_Longword range 0 .. 2**11-1;
 243    subtype Unsigned_12 is Unsigned_Longword range 0 .. 2**12-1;
 244    subtype Unsigned_13 is Unsigned_Longword range 0 .. 2**13-1;
 245    subtype Unsigned_14 is Unsigned_Longword range 0 .. 2**14-1;
 246    subtype Unsigned_15 is Unsigned_Longword range 0 .. 2**15-1;
 247    subtype Unsigned_16 is Unsigned_Longword range 0 .. 2**16-1;
 248    subtype Unsigned_17 is Unsigned_Longword range 0 .. 2**17-1;
 249    subtype Unsigned_18 is Unsigned_Longword range 0 .. 2**18-1;
 250    subtype Unsigned_19 is Unsigned_Longword range 0 .. 2**19-1;
 251    subtype Unsigned_20 is Unsigned_Longword range 0 .. 2**20-1;
 252    subtype Unsigned_21 is Unsigned_Longword range 0 .. 2**21-1;
 253    subtype Unsigned_22 is Unsigned_Longword range 0 .. 2**22-1;
 254    subtype Unsigned_23 is Unsigned_Longword range 0 .. 2**23-1;
 255    subtype Unsigned_24 is Unsigned_Longword range 0 .. 2**24-1;
 256    subtype Unsigned_25 is Unsigned_Longword range 0 .. 2**25-1;
 257    subtype Unsigned_26 is Unsigned_Longword range 0 .. 2**26-1;
 258    subtype Unsigned_27 is Unsigned_Longword range 0 .. 2**27-1;
 259    subtype Unsigned_28 is Unsigned_Longword range 0 .. 2**28-1;
 260    subtype Unsigned_29 is Unsigned_Longword range 0 .. 2**29-1;
 261    subtype Unsigned_30 is Unsigned_Longword range 0 .. 2**30-1;
 262    subtype Unsigned_31 is Unsigned_Longword range 0 .. 2**31-1;
 263
 264    --  Function for obtaining global symbol values
 265
 266    function Import_Value         (Symbol : String) return Unsigned_Longword;
 267    function Import_Address       (Symbol : String) return Address;
 268    function Import_Largest_Value (Symbol : String) return Largest_Integer;
 269
 270    pragma Import (Intrinsic, Import_Value);
 271    pragma Import (Intrinsic, Import_Address);
 272    pragma Import (Intrinsic, Import_Largest_Value);
 273
 274    --  For the following declarations, note that the declaration without a
 275    --  Retry_Count parameter means to retry infinitely. A value of zero for
 276    --  the Retry_Count parameter means do not retry.
 277
 278    --  Interlocked-instruction procedures
 279
 280    procedure Clear_Interlocked
 281      (Bit       : in out Boolean;
 282       Old_Value : out Boolean);
 283
 284    procedure Set_Interlocked
 285      (Bit       : in out Boolean;
 286       Old_Value : out Boolean);
 287
 288    type Aligned_Word is record
 289       Value : Short_Integer;
 290    end record;
 291
 292    for Aligned_Word'Alignment use Integer'Min (2, Standard'Maximum_Alignment);
 293
 294    procedure Clear_Interlocked
 295      (Bit          : in out Boolean;
 296       Old_Value    : out Boolean;
 297       Retry_Count  : Natural;
 298       Success_Flag : out Boolean);
 299
 300    procedure Set_Interlocked
 301      (Bit          : in out Boolean;
 302       Old_Value    : out Boolean;
 303       Retry_Count  : Natural;
 304       Success_Flag : out Boolean);
 305
 306    procedure Add_Interlocked
 307      (Addend       : Short_Integer;
 308       Augend       : in out Aligned_Word;
 309       Sign         : out Integer);
 310
 311    type Aligned_Integer is record
 312       Value : Integer;
 313    end record;
 314
 315    for Aligned_Integer'Alignment use
 316      Integer'Min (4, Standard'Maximum_Alignment);
 317
 318    type Aligned_Long_Integer is record
 319       Value : Long_Integer;
 320    end record;
 321
 322    for Aligned_Long_Integer'Alignment use
 323      Integer'Min (8, Standard'Maximum_Alignment);
 324
 325    --  For the following declarations, note that the declaration without a
 326    --  Retry_Count parameter mean to retry infinitely. A value of zero for
 327    --  the Retry_Count means do not retry.
 328
 329    procedure Add_Atomic
 330      (To           : in out Aligned_Integer;
 331       Amount       : Integer);
 332
 333    procedure Add_Atomic
 334      (To           : in out Aligned_Integer;
 335       Amount       : Integer;
 336       Retry_Count  : Natural;
 337       Old_Value    : out Integer;
 338       Success_Flag : out Boolean);
 339
 340    procedure Add_Atomic
 341      (To           : in out Aligned_Long_Integer;
 342       Amount       : Long_Integer);
 343
 344    procedure Add_Atomic
 345      (To           : in out Aligned_Long_Integer;
 346       Amount       : Long_Integer;
 347       Retry_Count  : Natural;
 348       Old_Value    : out Long_Integer;
 349       Success_Flag : out Boolean);
 350
 351    procedure And_Atomic
 352      (To           : in out Aligned_Integer;
 353       From         : Integer);
 354
 355    procedure And_Atomic
 356      (To           : in out Aligned_Integer;
 357       From         : Integer;
 358       Retry_Count  : Natural;
 359       Old_Value    : out Integer;
 360       Success_Flag : out Boolean);
 361
 362    procedure And_Atomic
 363      (To           : in out Aligned_Long_Integer;
 364       From         : Long_Integer);
 365
 366    procedure And_Atomic
 367      (To           : in out Aligned_Long_Integer;
 368       From         : Long_Integer;
 369       Retry_Count  : Natural;
 370       Old_Value    : out Long_Integer;
 371       Success_Flag : out Boolean);
 372
 373    procedure Or_Atomic
 374      (To           : in out Aligned_Integer;
 375       From         : Integer);
 376
 377    procedure Or_Atomic
 378      (To           : in out Aligned_Integer;
 379       From         : Integer;
 380       Retry_Count  : Natural;
 381       Old_Value    : out Integer;
 382       Success_Flag : out Boolean);
 383
 384    procedure Or_Atomic
 385      (To           : in out Aligned_Long_Integer;
 386       From         : Long_Integer);
 387
 388    procedure Or_Atomic
 389      (To           : in out Aligned_Long_Integer;
 390       From         : Long_Integer;
 391       Retry_Count  : Natural;
 392       Old_Value    : out Long_Integer;
 393       Success_Flag : out Boolean);
 394
 395    type Insq_Status is (Fail_No_Lock, OK_Not_First, OK_First);
 396
 397    for Insq_Status use
 398      (Fail_No_Lock => -1,
 399       OK_Not_First =>  0,
 400       OK_First     => +1);
 401
 402    type Remq_Status is (
 403      Fail_No_Lock,
 404      Fail_Was_Empty,
 405      OK_Not_Empty,
 406      OK_Empty);
 407
 408    for Remq_Status use
 409      (Fail_No_Lock   => -1,
 410       Fail_Was_Empty =>  0,
 411       OK_Not_Empty   => +1,
 412       OK_Empty       => +2);
 413
 414    procedure Insqhi
 415      (Item   : Address;
 416       Header : Address;
 417       Status : out Insq_Status);
 418
 419    procedure Remqhi
 420      (Header : Address;
 421       Item   : out Address;
 422       Status : out Remq_Status);
 423
 424    procedure Insqti
 425      (Item   : Address;
 426       Header : Address;
 427       Status : out Insq_Status);
 428
 429    procedure Remqti
 430      (Header : Address;
 431       Item   : out Address;
 432       Status : out Remq_Status);
 433
 434 private
 435
 436    Address_Zero : constant Address := Null_Address;
 437    No_Addr      : constant Address := Null_Address;
 438
 439    --  An AST_Handler value is from a typing point of view simply a pointer
 440    --  to a procedure taking a single 64 bit parameter. However, this
 441    --  is a bit misleading, because the data that this pointer references is
 442    --  highly stylized. See body of System.AST_Handling for full details.
 443
 444    type AST_Handler is access procedure (Param : Long_Integer);
 445    No_AST_Handler : constant AST_Handler := null;
 446
 447    --  Other operators have incorrect profiles. It would be nice to make
 448    --  them intrinsic, since the backend can handle them, but the front
 449    --  end is not prepared to deal with them, so at least inline them.
 450
 451    pragma Inline_Always ("+");
 452    pragma Inline_Always ("-");
 453    pragma Inline_Always ("not");
 454    pragma Inline_Always ("and");
 455    pragma Inline_Always ("or");
 456    pragma Inline_Always ("xor");
 457
 458    --  Other inlined subprograms
 459
 460    pragma Inline_Always (Fetch_From_Address);
 461    pragma Inline_Always (Assign_To_Address);
 462
 463    --  Synchronization related subprograms. Mechanism is explicitly set
 464    --  so that the critical parameters are passed by reference.
 465    --  Without this, the parameters are passed by copy, creating load/store
 466    --  race conditions. We also inline them, since this seems more in the
 467    --  spirit of the original (hardware intrinsic) routines.
 468
 469    pragma Export_Procedure
 470      (Clear_Interlocked,
 471       External        => "system__aux_dec__clear_interlocked__1",
 472       Parameter_Types => (Boolean, Boolean),
 473       Mechanism       => (Reference, Reference));
 474    pragma Export_Procedure
 475      (Clear_Interlocked,
 476       External        => "system__aux_dec__clear_interlocked__2",
 477       Parameter_Types => (Boolean, Boolean, Natural, Boolean),
 478       Mechanism       => (Reference, Reference, Value, Reference));
 479    pragma Inline_Always (Clear_Interlocked);
 480
 481    pragma Export_Procedure
 482      (Set_Interlocked,
 483       External        => "system__aux_dec__set_interlocked__1",
 484       Parameter_Types => (Boolean, Boolean),
 485       Mechanism       => (Reference, Reference));
 486    pragma Export_Procedure
 487      (Set_Interlocked,
 488       External        => "system__aux_dec__set_interlocked__2",
 489       Parameter_Types => (Boolean, Boolean, Natural, Boolean),
 490       Mechanism       => (Reference, Reference, Value, Reference));
 491    pragma Inline_Always (Set_Interlocked);
 492
 493    pragma Export_Procedure
 494      (Add_Interlocked,
 495       External        => "system__aux_dec__add_interlocked__1",
 496       Mechanism       => (Value, Reference, Reference));
 497    pragma Inline_Always (Add_Interlocked);
 498
 499    pragma Export_Procedure
 500      (Add_Atomic,
 501       External        => "system__aux_dec__add_atomic__1",
 502       Parameter_Types => (Aligned_Integer, Integer),
 503       Mechanism       => (Reference, Value));
 504    pragma Export_Procedure
 505      (Add_Atomic,
 506       External        => "system__aux_dec__add_atomic__2",
 507       Parameter_Types => (Aligned_Integer, Integer, Natural, Integer, Boolean),
 508       Mechanism       => (Reference, Value, Value, Reference, Reference));
 509    pragma Export_Procedure
 510      (Add_Atomic,
 511       External        => "system__aux_dec__add_atomic__3",
 512       Parameter_Types => (Aligned_Long_Integer, Long_Integer),
 513       Mechanism       => (Reference, Value));
 514    pragma Export_Procedure
 515      (Add_Atomic,
 516       External        => "system__aux_dec__add_atomic__4",
 517       Parameter_Types => (Aligned_Long_Integer, Long_Integer, Natural,
 518                           Long_Integer, Boolean),
 519       Mechanism       => (Reference, Value, Value, Reference, Reference));
 520    pragma Inline_Always (Add_Atomic);
 521
 522    pragma Export_Procedure
 523      (And_Atomic,
 524       External        => "system__aux_dec__and_atomic__1",
 525       Parameter_Types => (Aligned_Integer, Integer),
 526       Mechanism       => (Reference, Value));
 527    pragma Export_Procedure
 528      (And_Atomic,
 529       External        => "system__aux_dec__and_atomic__2",
 530       Parameter_Types => (Aligned_Integer, Integer, Natural, Integer, Boolean),
 531       Mechanism       => (Reference, Value, Value, Reference, Reference));
 532    pragma Export_Procedure
 533      (And_Atomic,
 534       External => "system__aux_dec__and_atomic__3",
 535       Parameter_Types => (Aligned_Long_Integer, Long_Integer),
 536       Mechanism => (Reference, Value));
 537    pragma Export_Procedure
 538      (And_Atomic,
 539       External        => "system__aux_dec__and_atomic__4",
 540       Parameter_Types => (Aligned_Long_Integer, Long_Integer, Natural,
 541                           Long_Integer, Boolean),
 542       Mechanism       => (Reference, Value, Value, Reference, Reference));
 543    pragma Inline_Always (And_Atomic);
 544
 545    pragma Export_Procedure
 546      (Or_Atomic,
 547       External        => "system__aux_dec__or_atomic__1",
 548       Parameter_Types => (Aligned_Integer, Integer),
 549       Mechanism       => (Reference, Value));
 550    pragma Export_Procedure
 551      (Or_Atomic,
 552       External        => "system__aux_dec__or_atomic__2",
 553       Parameter_Types => (Aligned_Integer, Integer, Natural, Integer, Boolean),
 554       Mechanism       => (Reference, Value, Value, Reference, Reference));
 555    pragma Export_Procedure
 556      (Or_Atomic,
 557       External        => "system__aux_dec__or_atomic__3",
 558       Parameter_Types => (Aligned_Long_Integer, Long_Integer),
 559       Mechanism       => (Reference, Value));
 560    pragma Export_Procedure
 561      (Or_Atomic,
 562       External        => "system__aux_dec__or_atomic__4",
 563       Parameter_Types => (Aligned_Long_Integer, Long_Integer, Natural,
 564                           Long_Integer, Boolean),
 565       Mechanism       => (Reference, Value, Value, Reference, Reference));
 566    pragma Inline_Always (Or_Atomic);
 567
 568    --  Provide proper unchecked conversion definitions for transfer
 569    --  functions. Note that we need this level of indirection because
 570    --  the formal parameter name is X and not Source (and this is indeed
 571    --  detectable by a program)
 572
 573    function To_Unsigned_Byte_A is new
 574      Ada.Unchecked_Conversion (Bit_Array_8, Unsigned_Byte);
 575
 576    function To_Unsigned_Byte (X : Bit_Array_8) return Unsigned_Byte
 577      renames To_Unsigned_Byte_A;
 578
 579    function To_Bit_Array_8_A is new
 580      Ada.Unchecked_Conversion (Unsigned_Byte, Bit_Array_8);
 581
 582    function To_Bit_Array_8 (X : Unsigned_Byte) return Bit_Array_8
 583      renames To_Bit_Array_8_A;
 584
 585    function To_Unsigned_Word_A is new
 586      Ada.Unchecked_Conversion (Bit_Array_16, Unsigned_Word);
 587
 588    function To_Unsigned_Word (X : Bit_Array_16) return Unsigned_Word
 589      renames To_Unsigned_Word_A;
 590
 591    function To_Bit_Array_16_A is new
 592      Ada.Unchecked_Conversion (Unsigned_Word, Bit_Array_16);
 593
 594    function To_Bit_Array_16 (X : Unsigned_Word) return Bit_Array_16
 595      renames To_Bit_Array_16_A;
 596
 597    function To_Unsigned_Longword_A is new
 598      Ada.Unchecked_Conversion (Bit_Array_32, Unsigned_Longword);
 599
 600    function To_Unsigned_Longword (X : Bit_Array_32) return Unsigned_Longword
 601      renames To_Unsigned_Longword_A;
 602
 603    function To_Bit_Array_32_A is new
 604      Ada.Unchecked_Conversion (Unsigned_Longword, Bit_Array_32);
 605
 606    function To_Bit_Array_32 (X : Unsigned_Longword) return Bit_Array_32
 607      renames To_Bit_Array_32_A;
 608
 609    function To_Unsigned_32_A is new
 610      Ada.Unchecked_Conversion (Bit_Array_32, Unsigned_32);
 611
 612    function To_Unsigned_32 (X : Bit_Array_32) return Unsigned_32
 613      renames To_Unsigned_32_A;
 614
 615    function To_Bit_Array_32_A is new
 616      Ada.Unchecked_Conversion (Unsigned_32, Bit_Array_32);
 617
 618    function To_Bit_Array_32 (X : Unsigned_32) return Bit_Array_32
 619      renames To_Bit_Array_32_A;
 620
 621    function To_Unsigned_Quadword_A is new
 622      Ada.Unchecked_Conversion (Bit_Array_64, Unsigned_Quadword);
 623
 624    function To_Unsigned_Quadword (X : Bit_Array_64) return Unsigned_Quadword
 625      renames To_Unsigned_Quadword_A;
 626
 627    function To_Bit_Array_64_A is new
 628      Ada.Unchecked_Conversion (Unsigned_Quadword, Bit_Array_64);
 629
 630    function To_Bit_Array_64 (X : Unsigned_Quadword) return Bit_Array_64
 631      renames To_Bit_Array_64_A;
 632
 633    pragma Warnings (Off);
 634    --  Turn warnings off. This is needed for systems with 64-bit integers,
 635    --  where some of these operations are of dubious meaning, but we do not
 636    --  want warnings when we compile on such systems.
 637
 638    function To_Address_A is new
 639      Ada.Unchecked_Conversion (Integer, Address);
 640    pragma Pure_Function (To_Address_A);
 641
 642    function To_Address (X : Integer) return Address
 643      renames To_Address_A;
 644    pragma Pure_Function (To_Address);
 645
 646    function To_Address_Long_A is new
 647      Ada.Unchecked_Conversion (Unsigned_Longword, Address);
 648    pragma Pure_Function (To_Address_Long_A);
 649
 650    function To_Address_Long (X : Unsigned_Longword) return Address
 651      renames To_Address_Long_A;
 652    pragma Pure_Function (To_Address_Long);
 653
 654    function To_Integer_A is new
 655      Ada.Unchecked_Conversion (Address, Integer);
 656
 657    function To_Integer (X : Address) return Integer
 658      renames To_Integer_A;
 659
 660    function To_Unsigned_Longword_A is new
 661      Ada.Unchecked_Conversion (Address, Unsigned_Longword);
 662
 663    function To_Unsigned_Longword (X : Address) return Unsigned_Longword
 664      renames To_Unsigned_Longword_A;
 665
 666    function To_Unsigned_Longword_A is new
 667      Ada.Unchecked_Conversion (AST_Handler, Unsigned_Longword);
 668
 669    function To_Unsigned_Longword (X : AST_Handler) return Unsigned_Longword
 670      renames To_Unsigned_Longword_A;
 671
 672    pragma Warnings (On);
 673
 674 end System.Aux_DEC;