gcc/ada/impunit.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                              I M P U N I T                               --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --           Copyright (C) 2000-2005 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 -- GNAT was originally developed  by the GNAT team at  New York University. --
  23 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  24 --                                                                          --
  25 ------------------------------------------------------------------------------
  26
  27 with Lib;   use Lib;
  28 with Namet; use Namet;
  29
  30 package body Impunit is
  31
  32    subtype File_Name_8 is String (1 .. 8);
  33    type File_List is array (Nat range <>) of File_Name_8;
  34
  35    ------------------
  36    -- Ada 95 Units --
  37    ------------------
  38
  39    --  The following is a giant string list containing the names of all
  40    --  non-implementation internal files, i.e. the complete list of files for
  41    --  internal units which a program may legitimately WITH when operating in
  42    --  either Ada 95 or Ada 05 mode.
  43
  44    --  Note that this list should match the list of units documented in the
  45    --  "GNAT Library" section of the GNAT Reference Manual.
  46
  47    Non_Imp_File_Names_95 : constant File_List := (
  48
  49    ------------------------------------------------------
  50    -- Ada Hierarchy Units from Ada-83 Reference Manual --
  51    ------------------------------------------------------
  52
  53      "a-astaco",    -- Ada.Asynchronous_Task_Control
  54      "a-calend",    -- Ada.Calendar
  55      "a-chahan",    -- Ada.Characters.Handling
  56      "a-charac",    -- Ada.Characters
  57      "a-chlat1",    -- Ada.Characters.Latin_1
  58      "a-comlin",    -- Ada.Command_Line
  59      "a-decima",    -- Ada.Decimal
  60      "a-direio",    -- Ada.Direct_IO
  61      "a-dynpri",    -- Ada.Dynamic_Priorities
  62      "a-except",    -- Ada.Exceptions
  63      "a-finali",    -- Ada.Finalization
  64      "a-flteio",    -- Ada.Float_Text_IO
  65      "a-fwteio",    -- Ada.Float_Wide_Text_IO
  66      "a-inteio",    -- Ada.Integer_Text_IO
  67      "a-interr",    -- Ada.Interrupts
  68      "a-intnam",    -- Ada.Interrupts.Names
  69      "a-ioexce",    -- Ada.IO_Exceptions
  70      "a-iwteio",    -- Ada.Integer_Wide_Text_IO
  71      "a-ncelfu",    -- Ada.Numerics.Complex_Elementary_Functions
  72      "a-ngcefu",    -- Ada.Numerics.Generic_Complex_Elementary_Functions
  73      "a-ngcoty",    -- Ada.Numerics.Generic_Complex_Types
  74      "a-ngelfu",    -- Ada.Numerics.Generic_Elementary_Functions
  75      "a-nucoty",    -- Ada.Numerics.Complex_Types
  76      "a-nudira",    -- Ada.Numerics.Discrete_Random
  77      "a-nuelfu",    -- Ada.Numerics.Elementary_Functions
  78      "a-nuflra",    -- Ada.Numerics.Float_Random
  79      "a-numeri",    -- Ada.Numerics
  80      "a-reatim",    -- Ada.Real_Time
  81      "a-sequio",    -- Ada.Sequential_IO
  82      "a-stmaco",    -- Ada.Strings.Maps.Constants
  83      "a-storio",    -- Ada.Storage_IO
  84      "a-strbou",    -- Ada.Strings.Bounded
  85      "a-stream",    -- Ada.Streams
  86      "a-strfix",    -- Ada.Strings.Fixed
  87      "a-string",    -- Ada.Strings
  88      "a-strmap",    -- Ada.Strings.Maps
  89      "a-strunb",    -- Ada.Strings.Unbounded
  90      "a-ststio",    -- Ada.Streams.Stream_IO
  91      "a-stwibo",    -- Ada.Strings.Wide_Bounded
  92      "a-stwifi",    -- Ada.Strings.Wide_Fixed
  93      "a-stwima",    -- Ada.Strings.Wide_Maps
  94      "a-stwiun",    -- Ada.Strings.Wide_Unbounded
  95      "a-swmwco",    -- Ada.Strings.Wide_Maps.Wide_Constants
  96      "a-sytaco",    -- Ada.Synchronous_Task_Control
  97      "a-tags  ",    -- Ada.Tags
  98      "a-tasatt",    -- Ada.Task_Attributes
  99      "a-taside",    -- Ada.Task_Identification
 100      "a-teioed",    -- Ada.Text_IO.Editing
 101      "a-textio",    -- Ada.Text_IO
 102      "a-ticoio",    -- Ada.Text_IO.Complex_IO
 103      "a-titest",    -- Ada.Text_IO.Text_Streams
 104      "a-unccon",    -- Ada.Unchecked_Conversion
 105      "a-uncdea",    -- Ada.Unchecked_Deallocation
 106      "a-witeio",    -- Ada.Wide_Text_IO
 107      "a-wtcoio",    -- Ada.Wide_Text_IO.Complex_IO
 108      "a-wtedit",    -- Ada.Wide_Text_IO.Editing
 109      "a-wttest",    -- Ada.Wide_Text_IO.Text_Streams
 110
 111    -------------------------------------------------
 112    -- RM Required Additions to Ada for GNAT Types --
 113    -------------------------------------------------
 114
 115      "a-lfteio",    -- Ada.Long_Float_Text_IO
 116      "a-lfwtio",    -- Ada.Long_Float_Wide_Text_IO
 117      "a-liteio",    -- Ada.Long_Integer_Text_IO
 118      "a-liwtio",    -- Ada.Long_Integer_Wide_Text_IO
 119      "a-llftio",    -- Ada.Long_Long_Float_Text_IO
 120      "a-llfwti",    -- Ada.Long_Long_Float_Wide_Text_IO
 121      "a-llitio",    -- Ada.Long_Long_Integer_Text_IO
 122      "a-lliwti",    -- Ada.Long_Long_Integer_Wide_Text_IO
 123      "a-nlcefu",    -- Ada.Long_Complex_Elementary_Functions
 124      "a-nlcoty",    -- Ada.Numerics.Long_Complex_Types
 125      "a-nlelfu",    -- Ada.Numerics.Long_Elementary_Functions
 126      "a-nllcef",    -- Ada.Long_Long_Complex_Elementary_Functions
 127      "a-nllefu",    -- Ada.Numerics.Long_Long_Elementary_Functions
 128      "a-nllcty",    -- Ada.Numerics.Long_Long_Complex_Types
 129      "a-nscefu",    -- Ada.Short_Complex_Elementary_Functions
 130      "a-nscoty",    -- Ada.Numerics.Short_Complex_Types
 131      "a-nselfu",    -- Ada.Numerics.Short_Elementary_Functions
 132      "a-sfteio",    -- Ada.Short_Float_Text_IO
 133      "a-sfwtio",    -- Ada.Short_Float_Wide_Text_IO
 134      "a-siteio",    -- Ada.Short_Integer_Text_IO
 135      "a-siwtio",    -- Ada.Short_Integer_Wide_Text_IO
 136      "a-ssitio",    -- Ada.Short_Short_Integer_Text_IO
 137      "a-ssiwti",    -- Ada.Short_Short_Integer_Wide_Text_IO
 138
 139    -----------------------------------
 140    -- GNAT Defined Additions to Ada --
 141    -----------------------------------
 142
 143      "a-chlat9",    -- Ada.Characters.Latin_9
 144      "a-colien",    -- Ada.Command_Line.Environment
 145      "a-colire",    -- Ada.Command_Line.Remove
 146      "a-cwila1",    -- Ada.Characters.Wide_Latin_1
 147      "a-cwila9",    -- Ada.Characters.Wide_Latin_9
 148      "a-diocst",    -- Ada.Direct_IO.C_Streams
 149      "a-einuoc",    -- Ada.Exceptions.Is_Null_Occurrence
 150      "a-elchha",    -- Ada.Exceptions.Last_Chance_Handler
 151      "a-exctra",    -- Ada.Exceptions.Traceback
 152      "a-siocst",    -- Ada.Sequential_IO.C_Streams
 153      "a-ssicst",    -- Ada.Streams.Stream_IO.C_Streams
 154      "a-suteio",    -- Ada.Strings.Unbounded.Text_IO
 155      "a-swuwti",    -- Ada.Strings.Wide_Unbounded.Wide_Text_IO
 156      "a-taidim",    -- Ada.Task_Identification.Image
 157      "a-tiocst",    -- Ada.Text_IO.C_Streams
 158      "a-wtcstr",    -- Ada.Wide_Text_IO.C_Streams
 159
 160    ---------------------------
 161    -- GNAT Special IO Units --
 162    ---------------------------
 163
 164    --  As further explained elsewhere (see Sem_Ch10), the internal
 165    --  packages of Text_IO and Wide_Text_IO are actually implemented
 166    --  as separate children, but this fact is intended to be hidden
 167    --  from the user completely. Any attempt to WITH one of these
 168    --  units will be diagnosed as an error later on, but for now we
 169    --  do not consider these internal implementation units (if we did,
 170    --  then we would get a junk warning which would be confusing and
 171    --  unecessary, given that we generate a clear error message).
 172
 173      "a-tideio",    -- Ada.Text_IO.Decimal_IO
 174      "a-tienio",    -- Ada.Text_IO.Enumeration_IO
 175      "a-tifiio",    -- Ada.Text_IO.Fixed_IO
 176      "a-tiflio",    -- Ada.Text_IO.Float_IO
 177      "a-tiinio",    -- Ada.Text_IO.Integer_IO
 178      "a-tiinio",    -- Ada.Text_IO.Integer_IO
 179      "a-timoio",    -- Ada.Text_IO.Modular_IO
 180      "a-wtdeio",    -- Ada.Wide_Text_IO.Decimal_IO
 181      "a-wtenio",    -- Ada.Wide_Text_IO.Enumeration_IO
 182      "a-wtfiio",    -- Ada.Wide_Text_IO.Fixed_IO
 183      "a-wtflio",    -- Ada.Wide_Text_IO.Float_IO
 184      "a-wtinio",    -- Ada.Wide_Text_IO.Integer_IO
 185      "a-wtmoio",    -- Ada.Wide_Text_IO.Modular_IO
 186
 187    ------------------------
 188    -- GNAT Library Units --
 189    ------------------------
 190
 191      "g-arrspl",    -- GNAT.Array_Split
 192      "g-awk   ",    -- GNAT.AWK
 193      "g-boubuf",    -- GNAT.Bounded_Buffers
 194      "g-boumai",    -- GNAT.Bounded_Mailboxes
 195      "g-bubsor",    -- GNAT.Bubble_Sort
 196      "g-busora",    -- GNAT.Bubble_Sort_A
 197      "g-busorg",    -- GNAT.Bubble_Sort_G
 198      "g-calend",    -- GNAT.Calendar
 199      "g-casuti",    -- GNAT.Case_Util
 200      "g-catiio",    -- GNAT.Calendar.Time_IO
 201      "g-cgi   ",    -- GNAT.CGI
 202      "g-cgicoo",    -- GNAT.CGI.Cookie
 203      "g-cgideb",    -- GNAT.CGI.Debug
 204      "g-comlin",    -- GNAT.Command_Line
 205      "g-comver",    -- GNAT.Compiler_Version
 206      "g-crc32 ",    -- GNAT.CRC32
 207      "g-ctrl_c",    -- GNAT.Ctrl_C
 208      "g-curexc",    -- GNAT.Current_Exception
 209      "g-debpoo",    -- GNAT.Debug_Pools
 210      "g-debuti",    -- GNAT.Debug_Utilities
 211      "g-diopit",    -- GNAT.Directory_Operations.Iteration
 212      "g-dirope",    -- GNAT.Directory_Operations
 213      "g-dynhta",    -- GNAT.Dynamic_HTables
 214      "g-dyntab",    -- GNAT.Dynamic_Tables
 215      "g-excact",    -- GNAT.Exception_Actions
 216      "g-except",    -- GNAT.Exceptions
 217      "g-exctra",    -- GNAT.Exception_Traces
 218      "g-expect",    -- GNAT.Expect
 219      "g-flocon",    -- GNAT.Float_Control
 220      "g-heasor",    -- GNAT.Heap_Sort
 221      "g-hesora",    -- GNAT.Heap_Sort_A
 222      "g-hesorg",    -- GNAT.Heap_Sort_G
 223      "g-htable",    -- GNAT.Htable
 224      "g-io    ",    -- GNAT.IO
 225      "g-io_aux",    -- GNAT.IO_Aux
 226      "g-locfil",    -- GNAT.Lock_Files
 227      "g-md5   ",    -- GNAT.MD5
 228      "g-memdum",    -- GNAT.Memory_Dump
 229      "g-moreex",    -- GNAT.Most_Recent_Exception
 230      "g-os_lib",    -- GNAT.Os_Lib
 231      "g-pehage",    -- GNAT.Perfect_Hash_Generators
 232      "g-regexp",    -- GNAT.Regexp
 233      "g-regist",    -- GNAT.Registry
 234      "g-regpat",    -- GNAT.Regpat
 235      "g-semaph",    -- GNAT.Semaphores
 236      "g-sestin",    -- GNAT.Secondary_Stack_Info
 237      "g-signal",    -- GNAT.Signals
 238      "g-socket",    -- GNAT.Sockets
 239      "g-souinf",    -- GNAT.Source_Info
 240      "g-speche",    -- GNAT.Spell_Checker
 241      "g-spipat",    -- GNAT.Spitbol.Patterns
 242      "g-spitbo",    -- GNAT.Spitbol
 243      "g-sptabo",    -- GNAT.Spitbol.Table_Boolean
 244      "g-sptain",    -- GNAT.Spitbol.Table_Integer
 245      "g-sptavs",    -- GNAT.Spitbol.Table_Vstring
 246      "g-string",    -- GNAT.Strings
 247      "g-strspl",    -- GNAT.String_Split
 248      "g-table ",    -- GNAT.Table
 249      "g-tasloc",    -- GNAT.Task_Lock
 250      "g-thread",    -- GNAT.Threads
 251      "g-traceb",    -- GNAT.Traceback
 252      "g-trasym",    -- GNAT.Traceback.Symbolic
 253      "g-wistsp",    -- GNAT.Wide_String_Split
 254
 255    -----------------------------------------------------
 256    -- Interface Hierarchy Units from Reference Manual --
 257    -----------------------------------------------------
 258
 259      "i-c     ",    -- Interfaces.C
 260      "i-cobol ",    -- Interfaces.Cobol
 261      "i-cpoint",    -- Interfaces.C.Pointers
 262      "i-cstrin",    -- Interfaces.C.Strings
 263      "i-fortra",    -- Interfaces.Fortran
 264
 265    ------------------------------------------
 266    -- GNAT Defined Additions to Interfaces --
 267    ------------------------------------------
 268
 269      "i-cexten",    -- Interfaces.C.Extensions
 270      "i-cpp   ",    -- Interfaces.CPP
 271      "i-cstrea",    -- Interfaces.C.Streams
 272      "i-jalaob",    -- Interfaces.Java.Lang.Object
 273      "i-jalasy",    -- Interfaces.Java.Lang.System
 274      "i-jalath",    -- Interfaces.Java.Lang.Thread
 275      "i-java  ",    -- Interfaces.Java
 276      "i-javlan",    -- Interfaces.Java.Lang
 277      "i-os2err",    -- Interfaces.Os2lib.Errors
 278      "i-os2lib",    -- Interfaces.Os2lib
 279      "i-os2syn",    -- Interfaces.Os2lib.Synchronization
 280      "i-os2thr",    -- Interfaces.Os2lib.Threads
 281      "i-pacdec",    -- Interfaces.Packed_Decimal
 282      "i-vthrea",    -- Interfaces.Vthreads
 283      "i-vxwoio",    -- Interfaces.VxWorks.IO
 284      "i-vxwork",    -- Interfaces.VxWorks
 285
 286    --------------------------------------------------
 287    -- System Hierarchy Units from Reference Manual --
 288    --------------------------------------------------
 289
 290      "s-atacco",    -- System.Address_To_Access_Conversions
 291      "s-maccod",    -- System.Machine_Code
 292      "s-rpc   ",    -- System.Rpc
 293      "s-stoele",    -- System.Storage_Elements
 294      "s-stopoo",    -- System.Storage_Pools
 295
 296    --------------------------------------
 297    -- GNAT Defined Additions to System --
 298    --------------------------------------
 299
 300      "s-addima",    -- System.Address_Image
 301      "s-assert",    -- System.Assertions
 302      "s-memory",    -- System.Memory
 303      "s-parint",    -- System.Partition_Interface
 304      "s-pooglo",    -- System.Pool_Global
 305      "s-pooloc",    -- System.Pool_Local
 306      "s-restri",    -- System.Restrictions
 307      "s-rident",    -- System.Rident
 308      "s-tasinf",    -- System.Task_Info
 309      "s-wchcnv",    -- System.Wch_Cnv
 310      "s-wchcon");   -- System.Wch_Con
 311
 312    --------------------
 313    -- Ada 2005 Units --
 314    --------------------
 315
 316    --  The following units should be used only in Ada 05 mode
 317
 318    Non_Imp_File_Names_05 : constant File_List := (
 319
 320    --------------------------------------------------------
 321    -- Ada Hierarchy Units from Ada 2005 Reference Manual --
 322    --------------------------------------------------------
 323
 324      "a-cdlili",    -- Ada.Containers.Doubly_Linked_Lists
 325      "a-cgaaso",    -- Ada.Containers.Generic_Anonymous_Array_Sort
 326      "a-cgarso",    -- Ada.Containers.Generic_Array_Sort
 327      "a-cgcaso",    -- Ada.Containers.Generic_Constrained_Array_Sort
 328      "a-chtgke",    -- Ada.Containers.Hash_Tables.Generic_Keys
 329      "a-chtgop",    -- Ada.Containers.Hash_Tables.Generic_Operations
 330      "a-cidlli",    -- Ada.Containers.Indefinite_Doubly_Linked_Lists
 331      "a-cihama",    -- Ada.Containers.Indefinite_Hashed_Maps
 332      "a-cihase",    -- Ada.Containers.Indefinite_Hashed_Sets
 333      "a-ciorma",    -- Ada.Containers.Indefinite_Ordered_Maps
 334      "a-ciormu",    -- Ada.Containers.Indefinite_Ordered_Multisets
 335      "a-ciorse",    -- Ada.Containers.Indefinite_Ordered_Sets
 336      "a-cohama",    -- Ada.Containers.Hashed_Maps
 337      "a-cohase",    -- Ada.Containers.Hashed_Sets
 338      "a-cohata",    -- Ada.Containers.Hash_Tables
 339      "a-coinve",    -- Ada.Containers.Indefinite_Vectors
 340      "a-contai",    -- Ada.Containers
 341      "a-convec",    -- Ada.Containers.Vectors
 342      "a-coorma",    -- Ada.Containers.Ordered_Maps
 343      "a-coormu",    -- Ada.Containers.Ordered_Multisets
 344      "a-coorse",    -- Ada.Containers.Ordered_Sets
 345      "a-coprnu",    -- Ada.Containers.Prime_Numbers
 346      "a-crbltr",    -- Ada.Containers.Red_Black_Trees
 347      "a-crbtgk",    -- Ada.Containers.Red_Black_Trees.Generic_Keys
 348      "a-crbtgo",    -- Ada.Containers.Red_Black_Trees.Generic_Operations
 349      "a-direct",    -- Ada.Directories
 350      "a-rbtgso",    -- Ada.Containers.Red_Black_Trees.Generic_Set_Operations
 351      "a-secain",    -- Ada.Strings.Equal_Case_Insensitive
 352      "a-shcain",    -- Ada.Strings.Hash_Case_Insensitive
 353      "a-slcain",    -- Ada.Strings.Less_Case_Insensitive
 354      "a-strhas",    -- Ada.Strings.Hash
 355      "a-stunha",    -- Ada.Strings.Unbounded.Hash
 356      "a-stwiha",    -- Ada.Strings.Wide_Hash
 357      "a-stzbou",    -- Ada.Strings.Wide_Wide_Bounded
 358      "a-stzfix",    -- Ada.Strings.Wide_Wide_Fixed
 359      "a-stzhas",    -- Ada.Strings.Wide_Wide_Hash
 360      "a-stzmap",    -- Ada.Strings.Wide_Wide_Maps
 361      "a-stzunb",    -- Ada.Strings.Wide_Wide_Unbounded
 362      "a-swunha",    -- Ada.Strings.Wide_Unbounded.Hash
 363      "a-szmzco",    -- Ada.Strings.Wide_Wide_Maps.Wide_Wide_Constants;
 364      "a-szunha",    -- Ada.Strings.Wide_Wide_Unbounded.Hash
 365      "a-tiunio",    -- Ada.Text_IO.Unbounded_IO;
 366      "a-wwunio",    -- Ada.Wide_Text_IO.Wide_Unbounded_IO;
 367      "a-zttest",    -- Ada.Wide_Wide_Text_IO.Text_Streams
 368      "a-ztexio",    -- Ada.Wide_Wide_Text_IO
 369      "a-zzunio",    -- Ada.Wide_Wide_Text_IO.Wide_Wide_Unbounded_IO
 370
 371    ------------------------------------------------------
 372    -- RM Required Additions to Ada 2005 for GNAT Types --
 373    ------------------------------------------------------
 374
 375      "a-lfztio",    -- Ada.Long_Float_Wide_Wide_Text_IO
 376      "a-liztio",    -- Ada.Long_Integer_Wide_Wide_Text_IO
 377      "a-llfzti",    -- Ada.Long_Long_Float_Wide_Wide_Text_IO
 378      "a-llizti",    -- Ada.Long_Long_Integer_Wide_Wide_Text_IO
 379      "a-sfztio",    -- Ada.Short_Float_Wide_Wide_Text_IO
 380      "a-siztio",    -- Ada.Short_Integer_Wide_Wide_Text_IO
 381      "a-ssizti",    -- Ada.Short_Short_Integer_Wide_Wide_Text_IO
 382      "a-ztcstr",    -- Ada.Wide_Wide_Text_IO.C_Streams
 383
 384    ----------------------------------------
 385    -- GNAT Defined Additions to Ada 2005 --
 386    ----------------------------------------
 387
 388      "a-chzla1",    -- Ada.Characters.Wide_Wide_Latin_1
 389      "a-chzla9",    -- Ada.Characters.Wide_Wide_Latin_9
 390      "a-szuzti",    -- Ada.Strings.Wide_Wide_Unbounded.Wide_Wide_Text_IO
 391
 392    ---------------------------
 393    -- GNAT Special IO Units --
 394    ---------------------------
 395
 396    --  See Ada 95 section for further information. These packages are for the
 397    --  implementation of the Wide_Wide_Text_IO generic packages.
 398
 399      "a-ztdeio",    -- Ada.Wide_Wide_Text_IO.Decimal_IO
 400      "a-ztenio",    -- Ada.Wide_Wide_Text_IO.Enumeration_IO
 401      "a-ztfiio",    -- Ada.Wide_Wide_Text_IO.Fixed_IO
 402      "a-ztflio",    -- Ada.Wide_Wide_Text_IO.Float_IO
 403      "a-ztinio",    -- Ada.Wide_Wide_Text_IO.Integer_IO
 404      "a-ztmoio",    -- Ada.Wide_Wide_Text_IO.Modular_IO
 405
 406    ------------------------
 407    -- GNAT Library Units --
 408    ------------------------
 409
 410      "g-zstspl");   -- GNAT.Wide_Wide_String_Split
 411
 412    ----------------------
 413    -- Get_Kind_Of_Unit --
 414    ----------------------
 415
 416    function Get_Kind_Of_Unit (U : Unit_Number_Type) return Kind_Of_Unit is
 417       Fname : constant File_Name_Type := Unit_File_Name (U);
 418
 419    begin
 420       --  If length of file name is greater than 12, not predefined.
 421       --  The value 12 here is an 8 char name with extension .ads.
 422
 423       if Length_Of_Name (Fname) > 12 then
 424          return Not_Predefined_Unit;
 425       end if;
 426
 427       --  Otherwise test file name
 428
 429       Get_Name_String (Fname);
 430
 431       --  Not predefined if file name does not start with a- g- s- i-
 432
 433       if Name_Len < 3
 434         or else Name_Buffer (2) /= '-'
 435         or else (Name_Buffer (1) /= 'a'
 436                    and then
 437                  Name_Buffer (1) /= 'g'
 438                    and then
 439                  Name_Buffer (1) /= 'i'
 440                    and then
 441                  Name_Buffer (1) /= 's')
 442       then
 443          return Not_Predefined_Unit;
 444       end if;
 445
 446       --  Not predefined if file name does not end in .ads. This can
 447       --  happen when non-standard file names are being used.
 448
 449       if Name_Buffer (Name_Len - 3 .. Name_Len) /= ".ads" then
 450          return Not_Predefined_Unit;
 451       end if;
 452
 453       --  Otherwise normalize file name to 8 characters
 454
 455       Name_Len := Name_Len - 4;
 456       while Name_Len < 8 loop
 457          Name_Len := Name_Len + 1;
 458          Name_Buffer (Name_Len) := ' ';
 459       end loop;
 460
 461       --  See if name is in 95 list
 462
 463       for J in Non_Imp_File_Names_95'Range loop
 464          if Name_Buffer (1 .. 8) = Non_Imp_File_Names_95 (J) then
 465             return Ada_95_Unit;
 466          end if;
 467       end loop;
 468
 469       --  See if name is in 05 list
 470
 471       for J in Non_Imp_File_Names_05'Range loop
 472          if Name_Buffer (1 .. 8) = Non_Imp_File_Names_05 (J) then
 473             return Ada_05_Unit;
 474          end if;
 475       end loop;
 476
 477       --  Only remaining special possibilities are children of System.RPC and
 478       --  System.Garlic and special files of the form System.Aux...
 479
 480       Get_Name_String (Unit_Name (U));
 481
 482       if Name_Len > 12
 483         and then Name_Buffer (1 .. 11) = "system.rpc."
 484       then
 485          return Ada_95_Unit;
 486       end if;
 487
 488       if Name_Len > 15
 489         and then Name_Buffer (1 .. 14) = "system.garlic."
 490       then
 491          return Ada_95_Unit;
 492       end if;
 493
 494       if Name_Len > 11
 495         and then Name_Buffer (1 .. 10) = "system.aux"
 496       then
 497          return Ada_95_Unit;
 498       end if;
 499
 500       --  All tests failed, this is definitely an implementation unit
 501
 502       return Implementation_Unit;
 503    end Get_Kind_Of_Unit;
 504
 505 end Impunit;