summaryrefslogtreecommitdiff
path: root/gcc/ada/namet.ads
blob: 8eb56835bbad47581ca5af3b10470146f58f94e3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
------------------------------------------------------------------------------
--                                                                          --
--                         GNAT COMPILER COMPONENTS                         --
--                                                                          --
--                                N A M E T                                 --
--                                                                          --
--                                 S p e c                                  --
--                                                                          --
--          Copyright (C) 1992-2010, Free Software Foundation, Inc.         --
--                                                                          --
-- GNAT is free software;  you can  redistribute it  and/or modify it under --
-- terms of the  GNU General Public License as published  by the Free Soft- --
-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
--                                                                          --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception,   --
-- version 3.1, as published by the Free Software Foundation.               --
--                                                                          --
-- You should have received a copy of the GNU General Public License and    --
-- a copy of the GCC Runtime Library Exception along with this program;     --
-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
-- <http://www.gnu.org/licenses/>.                                          --
--                                                                          --
-- GNAT was originally developed  by the GNAT team at  New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc.      --
--                                                                          --
------------------------------------------------------------------------------

with Alloc;
with Table;
with Hostparm; use Hostparm;
with System;   use System;
with Types;    use Types;

package Namet is

--  WARNING: There is a C version of this package. Any changes to this
--  source file must be properly reflected in the C header file namet.h
--  which is created manually from namet.ads and namet.adb.

--  This package contains routines for handling the names table. The table
--  is used to store character strings for identifiers and operator symbols,
--  as well as other string values such as unit names and file names.

--  The forms of the entries are as follows:

--    Identifiers Stored with upper case letters folded to lower case. Upper
--                       half (16#80# bit set) and wide characters are stored
--                       in an encoded form (Uhh for upper half char, Whhhh
--                       for wide characters, WWhhhhhhhh as provided by the
--                       routine Store_Encoded_Character, where hh are hex
--                       digits for the character code using lower case a-f).
--                       Normally the use of U or W in other internal names is
--                       avoided, but these letters may be used in internal
--                       names (without this special meaning), if they appear
--                       as the last character of the name, or they are
--                       followed by an upper case letter (other than the WW
--                       sequence), or an underscore.

--    Operator symbols   Stored with an initial letter O, and the remainder
--                       of the name is the lower case characters XXX where
--                       the name is Name_Op_XXX, see Snames spec for a full
--                       list of the operator names. Normally the use of O
--                       in other internal names is avoided, but it may be
--                       used in internal names (without this special meaning)
--                       if it is the last character of the name, or if it is
--                       followed by an upper case letter or an underscore.

--    Character literals Character literals have names that are used only for
--                       debugging and error message purposes. The form is an
--                       upper case Q followed by a single lower case letter,
--                       or by a Uxx/Wxxxx/WWxxxxxxx encoding as described for
--                       identifiers. The Set_Character_Literal_Name procedure
--                       should be used to construct these encodings. Normally
--                       the use of O in other internal names is avoided, but
--                       it may be used in internal names (without this special
--                       meaning) if it is the last character of the name, or
--                       if it is followed by an upper case letter or an
--                       underscore.

--    Unit names         Stored with upper case letters folded to lower case,
--                       using Uhh/Whhhh/WWhhhhhhhh encoding as described for
--                       identifiers, and a %s or %b suffix for specs/bodies.
--                       See package Uname for further details.

--    File names         Are stored in the form provided by Osint. Typically
--                       they may include wide character escape sequences and
--                       upper case characters (in non-encoded form). Casing
--                       is also derived from the external environment. Note
--                       that file names provided by Osint must generally be
--                       consistent with the names from Fname.Get_File_Name.

--    Other strings      The names table is also used as a convenient storage
--                       location for other variable length strings such as
--                       error messages etc. There are no restrictions on what
--                       characters may appear for such entries.

--  Note: the encodings Uhh (upper half characters), Whhhh (wide characters),
--  WWhhhhhhhh (wide wide characters) and Qx (character literal names) are
--  described in the spec, since they are visible throughout the system (e.g.
--  in debugging output). However, no code should depend on these particular
--  encodings, so it should be possible to change the encodings by making
--  changes only to the Namet specification (to change these comments) and the
--  body (which actually implements the encodings).

--  The names are hashed so that a given name appears only once in the table,
--  except that names entered with Name_Enter as opposed to Name_Find are
--  omitted from the hash table.

--  The first 26 entries in the names table (with Name_Id values in the range
--  First_Name_Id .. First_Name_Id + 25) represent names which are the one
--  character lower case letters in the range a-z, and these names are created
--  and initialized by the Initialize procedure.

--  Two values, one of type Int and one of type Byte, are stored with each
--  names table entry and subprograms are provided for setting and retrieving
--  these associated values. The usage of these values is up to the client. In
--  the compiler, the Int field is used to point to a chain of potentially
--  visible entities (see Sem.Ch8 for details), and the Byte field is used to
--  hold the Token_Type value for reserved words (see Sem for details). In the
--  binder, the Byte field is unused, and the Int field is used in various
--  ways depending on the name involved (see binder documentation).

   Name_Buffer : String (1 .. 4 * Max_Line_Length);
   --  This buffer is used to set the name to be stored in the table for the
   --  Name_Find call, and to retrieve the name for the Get_Name_String call.
   --  The limit here is intended to be an infinite value that ensures that we
   --  never overflow the buffer (names this long are too absurd to worry!)

   Name_Len : Natural;
   --  Length of name stored in Name_Buffer. Used as an input parameter for
   --  Name_Find, and as an output value by Get_Name_String, or Write_Name.

   -----------------------------
   -- Types for Namet Package --
   -----------------------------

   --  Name_Id values are used to identify entries in the names table. Except
   --  for the special values No_Name and Error_Name, they are subscript values
   --  for the Names table defined in this package.

   --  Note that with only a few exceptions, which are clearly documented, the
   --  type Name_Id should be regarded as a private type. In particular it is
   --  never appropriate to perform arithmetic operations using this type.

   type Name_Id is range Names_Low_Bound .. Names_High_Bound;
   for Name_Id'Size use 32;
   --  Type used to identify entries in the names table

   No_Name : constant Name_Id := Names_Low_Bound;
   --  The special Name_Id value No_Name is used in the parser to indicate
   --  a situation where no name is present (e.g. on a loop or block).

   Error_Name : constant Name_Id := Names_Low_Bound +  1;
   --  The special Name_Id value Error_Name is used in the parser to
   --  indicate that some kind of error was encountered in scanning out
   --  the relevant name, so it does not have a representable label.

   subtype Error_Name_Or_No_Name is Name_Id range No_Name .. Error_Name;
   --  Used to test for either error name or no name

   First_Name_Id : constant Name_Id := Names_Low_Bound + 2;
   --  Subscript of first entry in names table

   -----------------
   -- Subprograms --
   -----------------

   procedure Finalize;
   --  Called at the end of a use of the Namet package (before a subsequent
   --  call to Initialize). Currently this routine is only used to generate
   --  debugging output.

   procedure Get_Name_String (Id : Name_Id);
   --  Get_Name_String is used to retrieve the string associated with an entry
   --  in the names table. The resulting string is stored in Name_Buffer and
   --  Name_Len is set. It is an error to call Get_Name_String with one of the
   --  special name Id values (No_Name or Error_Name).

   function Get_Name_String (Id : Name_Id) return String;
   --  This functional form returns the result as a string without affecting
   --  the contents of either Name_Buffer or Name_Len. The lower bound is 1.

   procedure Get_Unqualified_Name_String (Id : Name_Id);
   --  Similar to the above except that qualification (as defined in unit
   --  Exp_Dbug) is removed (including both preceding __ delimited names, and
   --  also the suffixes used to indicate package body entities and to
   --  distinguish between overloaded entities). Note that names are not
   --  qualified until just before the call to gigi, so this routine is only
   --  needed by processing that occurs after gigi has been called. This
   --  includes all ASIS processing, since ASIS works on the tree written
   --  after gigi has been called.

   procedure Get_Name_String_And_Append (Id : Name_Id);
   --  Like Get_Name_String but the resulting characters are appended to the
   --  current contents of the entry stored in Name_Buffer, and Name_Len is
   --  incremented to include the added characters.

   procedure Get_Decoded_Name_String (Id : Name_Id);
   --  Same calling sequence an interface as Get_Name_String, except that the
   --  result is decoded, so that upper half characters and wide characters
   --  appear as originally found in the source program text, operators have
   --  their source forms (special characters and enclosed in quotes), and
   --  character literals appear surrounded by apostrophes.

   procedure Get_Unqualified_Decoded_Name_String (Id : Name_Id);
   --  Similar to the above except that qualification (as defined in unit
   --  Exp_Dbug) is removed (including both preceding __ delimited names, and
   --  also the suffix used to indicate package body entities). Note that
   --  names are not qualified until just before the call to gigi, so this
   --  routine is only needed by processing that occurs after gigi has been
   --  called. This includes all ASIS processing, since ASIS works on the tree
   --  written after gigi has been called.

   procedure Get_Decoded_Name_String_With_Brackets (Id : Name_Id);
   --  This routine is similar to Decoded_Name, except that the brackets
   --  notation (Uhh replaced by ["hh"], Whhhh replaced by ["hhhh"],
   --  WWhhhhhhhh replaced by ["hhhhhhhh"]) is used for all non-lower half
   --  characters, regardless of how Opt.Wide_Character_Encoding_Method is
   --  set, and also in that characters in the range 16#80# .. 16#FF# are
   --  converted to brackets notation in all cases. This routine can be used
   --  when there is a requirement for a canonical representation not affected
   --  by the character set options (e.g. in the binder generation of
   --  symbols).

   function Get_Name_Table_Byte (Id : Name_Id) return Byte;
   pragma Inline (Get_Name_Table_Byte);
   --  Fetches the Byte value associated with the given name

   function Get_Name_Table_Info (Id : Name_Id) return Int;
   pragma Inline (Get_Name_Table_Info);
   --  Fetches the Int value associated with the given name

   function Is_Operator_Name (Id : Name_Id) return Boolean;
   --  Returns True if name given is of the form of an operator (that
   --  is, it starts with an upper case O).

   procedure Initialize;
   --  This is a dummy procedure. It is retained for easy compatibility with
   --  clients who used to call Initialize when this call was required. Now
   --  initialization is performed automatically during package elaboration.
   --  Note that this change fixes problems which existed prior to the change
   --  of Initialize being called more than once. See also Reinitialize which
   --  allows reinitialiation of the tables.

   procedure Lock;
   --  Lock name tables before calling back end. We reserve some extra space
   --  before locking to avoid unnecessary inefficiencies when we unlock.

   procedure Reinitialize;
   --  Clears the name tables and removes all existing entries from the table.

   procedure Unlock;
   --  Unlocks the name table to allow use of the extra space reserved by the
   --  call to Lock. See gnat1drv for details of the need for this.

   function Length_Of_Name (Id : Name_Id) return Nat;
   pragma Inline (Length_Of_Name);
   --  Returns length of given name in characters. This is the length of the
   --  encoded name, as stored in the names table, the result is equivalent to
   --  calling Get_Name_String and reading Name_Len, except that a call to
   --  Length_Of_Name does not affect the contents of Name_Len and Name_Buffer.

   function Name_Chars_Address return System.Address;
   --  Return starting address of name characters table (used in Back_End call
   --  to Gigi).

   function Name_Find return Name_Id;
   --  Name_Find is called with a string stored in Name_Buffer whose length is
   --  in Name_Len (i.e. the characters of the name are in subscript positions
   --  1 to Name_Len in Name_Buffer). It searches the names table to see if
   --  the string has already been stored. If so the Id of the existing entry
   --  is returned. Otherwise a new entry is created with its Name_Table_Info
   --  field set to zero. The contents of Name_Buffer and Name_Len are not
   --  modified by this call. Note that it is permissible for Name_Len to be
   --  set to zero to lookup the null name string.

   function Name_Enter return Name_Id;
   --  Name_Enter has the same calling interface as Name_Find. The difference
   --  is that it does not search the table for an existing match, and also
   --  subsequent Name_Find calls using the same name will not locate the
   --  entry created by this call. Thus multiple calls to Name_Enter with the
   --  same name will create multiple entries in the name table with different
   --  Name_Id values. This is useful in the case of created names, which are
   --  never expected to be looked up. Note: Name_Enter should never be used
   --  for one character names, since these are efficiently located without
   --  hashing by Name_Find in any case.

   function Name_Entries_Address return System.Address;
   --  Return starting address of Names table (used in Back_End call to Gigi)

   function Name_Entries_Count return Nat;
   --  Return current number of entries in the names table

   function Is_OK_Internal_Letter (C : Character) return Boolean;
   pragma Inline (Is_OK_Internal_Letter);
   --  Returns true if C is a suitable character for using as a prefix or a
   --  suffix of an internally generated name, i.e. it is an upper case letter
   --  other than one of the ones used for encoding source names (currently
   --  the set of reserved letters is O, Q, U, W) and also returns False for
   --  the letter X, which is reserved for debug output (see Exp_Dbug).

   function Is_Internal_Name (Id : Name_Id) return Boolean;
   --  Returns True if the name is an internal name (i.e. contains a character
   --  for which Is_OK_Internal_Letter is true, or if the name starts or ends
   --  with an underscore. This call destroys the value of Name_Len and
   --  Name_Buffer (it loads these as for Get_Name_String).
   --
   --  Note: if the name is qualified (has a double underscore), then only the
   --  final entity name is considered, not the qualifying names. Consider for
   --  example that the name:
   --
   --    pkg__B_1__xyz
   --
   --  is not an internal name, because the B comes from the internal name of
   --  a qualifying block, but the xyz means that this was indeed a declared
   --  identifier called "xyz" within this block and there is nothing internal
   --  about that name.

   function Is_Internal_Name return Boolean;
   --  Like the form with an Id argument, except that the name to be tested is
   --  passed in Name_Buffer and Name_Len (which are not affected by the call).
   --  Name_Buffer (it loads these as for Get_Name_String).

   function Is_Valid_Name (Id : Name_Id) return Boolean;
   --  True if Id is a valid name -- points to a valid entry in the
   --  Name_Entries table.

   procedure Reset_Name_Table;
   --  This procedure is used when there are multiple source files to reset
   --  the name table info entries associated with current entries in the
   --  names table. There is no harm in keeping the names entries themselves
   --  from one compilation to another, but we can't keep the entity info,
   --  since this refers to tree nodes, which are destroyed between each main
   --  source file.

   procedure Add_Char_To_Name_Buffer (C : Character);
   pragma Inline (Add_Char_To_Name_Buffer);
   --  Add given character to the end of the string currently stored in the
   --  Name_Buffer, incrementing Name_Len.

   procedure Add_Nat_To_Name_Buffer (V : Nat);
   --  Add decimal representation of given value to the end of the string
   --  currently stored in Name_Buffer, incrementing Name_Len as required.

   procedure Add_Str_To_Name_Buffer (S : String);
   --  Add characters of string S to the end of the string currently stored
   --  in the Name_Buffer, incrementing Name_Len by the length of the string.

   procedure Insert_Str_In_Name_Buffer (S : String; Index : Positive);
   --  Inserts given string in name buffer, starting at Index. Any existing
   --  characters at or past this location get moved beyond the inserted string
   --  and Name_Len is incremented by the length of the string.

   procedure Set_Character_Literal_Name (C : Char_Code);
   --  This procedure sets the proper encoded name for the character literal
   --  for the given character code. On return Name_Buffer and Name_Len are
   --  set to reflect the stored name.

   procedure Set_Name_Table_Info (Id : Name_Id; Val : Int);
   pragma Inline (Set_Name_Table_Info);
   --  Sets the Int value associated with the given name

   procedure Set_Name_Table_Byte (Id : Name_Id; Val : Byte);
   pragma Inline (Set_Name_Table_Byte);
   --  Sets the Byte value associated with the given name

   procedure Store_Encoded_Character (C : Char_Code);
   --  Stores given character code at the end of Name_Buffer, updating the
   --  value in Name_Len appropriately. Lower case letters and digits are
   --  stored unchanged. Other 8-bit characters are stored using the Uhh
   --  encoding (hh = hex code), other 16-bit wide character values are stored
   --  using the Whhhh (hhhh = hex code) encoding, and other 32-bit wide wide
   --  character values are stored using the WWhhhhhhhh (hhhhhhhh = hex code).
   --  Note that this procedure does not fold upper case letters (they are
   --  stored using the Uhh encoding). If folding is required, it must be done
   --  by the caller prior to the call.

   procedure Tree_Read;
   --  Initializes internal tables from current tree file using the relevant
   --  Table.Tree_Read routines. Note that Initialize should not be called if
   --  Tree_Read is used. Tree_Read includes all necessary initialization.

   procedure Tree_Write;
   --  Writes out internal tables to current tree file using the relevant
   --  Table.Tree_Write routines.

   procedure Get_Last_Two_Chars (N : Name_Id; C1, C2 : out Character);
   --  Obtains last two characters of a name. C1 is last but one character
   --  and C2 is last character. If name is less than two characters long,
   --  then both C1 and C2 are set to ASCII.NUL on return.

   procedure Write_Name (Id : Name_Id);
   --  Write_Name writes the characters of the specified name using the
   --  standard output procedures in package Output. No end of line is
   --  written, just the characters of the name. On return Name_Buffer and
   --  Name_Len are set as for a call to Get_Name_String. The name is written
   --  in encoded form (i.e. including Uhh, Whhh, Qx, _op as they appear in
   --  the name table). If Id is Error_Name, or No_Name, no text is output.

   procedure Write_Name_Decoded (Id : Name_Id);
   --  Like Write_Name, except that the name written is the decoded name, as
   --  described for Get_Decoded_Name_String, and the resulting value stored
   --  in Name_Len and Name_Buffer is the decoded name.

   ------------------------------
   -- File and Unit Name Types --
   ------------------------------

   --  These are defined here in Namet rather than Fname and Uname to avoid
   --  problems with dependencies, and to avoid dragging in Fname and Uname
   --  into many more files, but it would be cleaner to move to Fname/Uname.

   type File_Name_Type is new Name_Id;
   --  File names are stored in the names table and this type is used to
   --  indicate that a Name_Id value is being used to hold a simple file name
   --  (which does not include any directory information).

   No_File : constant File_Name_Type := File_Name_Type (No_Name);
   --  Constant used to indicate no file is present (this is used for example
   --  when a search for a file indicates that no file of the name exists).

   Error_File_Name : constant File_Name_Type := File_Name_Type (Error_Name);
   --  The special File_Name_Type value Error_File_Name is used to indicate
   --  a unit name where some previous processing has found an error.

   subtype Error_File_Name_Or_No_File is
     File_Name_Type range No_File .. Error_File_Name;
   --  Used to test for either error file name or no file

   type Path_Name_Type is new Name_Id;
   --  Path names are stored in the names table and this type is used to
   --  indicate that a Name_Id value is being used to hold a path name (that
   --  may contain directory information).

   No_Path : constant Path_Name_Type := Path_Name_Type (No_Name);
   --  Constant used to indicate no path name is present

   type Unit_Name_Type is new Name_Id;
   --  Unit names are stored in the names table and this type is used to
   --  indicate that a Name_Id value is being used to hold a unit name, which
   --  terminates in %b for a body or %s for a spec.

   No_Unit_Name : constant Unit_Name_Type := Unit_Name_Type (No_Name);
   --  Constant used to indicate no file name present

   Error_Unit_Name : constant Unit_Name_Type := Unit_Name_Type (Error_Name);
   --  The special Unit_Name_Type value Error_Unit_Name is used to indicate
   --  a unit name where some previous processing has found an error.

   subtype Error_Unit_Name_Or_No_Unit_Name is
     Unit_Name_Type range No_Unit_Name .. Error_Unit_Name;

   ------------------------
   -- Debugging Routines --
   ------------------------

   procedure wn (Id : Name_Id);
   pragma Export (Ada, wn);
   --  This routine is intended for debugging use only (i.e. it is intended to
   --  be called from the debugger). It writes the characters of the specified
   --  name using the standard output procedures in package Output, followed by
   --  a new line. The name is written in encoded form (i.e. including Uhh,
   --  Whhh, Qx, _op as they appear in the name table). If Id is Error_Name,
   --  No_Name, or invalid an appropriate string is written (<Error_Name>,
   --  <No_Name>, <invalid name>). Unlike Write_Name, this call does not affect
   --  the contents of Name_Buffer or Name_Len.

   ---------------------------
   -- Table Data Structures --
   ---------------------------

   --  The following declarations define the data structures used to store
   --  names. The definitions are in the private part of the package spec,
   --  rather than the body, since they are referenced directly by gigi.

private

   --  This table stores the actual string names. Although logically there is
   --  no need for a terminating character (since the length is stored in the
   --  name entry table), we still store a NUL character at the end of every
   --  name (for convenience in interfacing to the C world).

   package Name_Chars is new Table.Table (
     Table_Component_Type => Character,
     Table_Index_Type     => Int,
     Table_Low_Bound      => 0,
     Table_Initial        => Alloc.Name_Chars_Initial,
     Table_Increment      => Alloc.Name_Chars_Increment,
     Table_Name           => "Name_Chars");

   type Name_Entry is record
      Name_Chars_Index : Int;
      --  Starting location of characters in the Name_Chars table minus one
      --  (i.e. pointer to character just before first character). The reason
      --  for the bias of one is that indexes in Name_Buffer are one's origin,
      --  so this avoids unnecessary adds and subtracts of 1.

      Name_Len : Short;
      --  Length of this name in characters

      Byte_Info : Byte;
      --  Byte value associated with this name

      Name_Has_No_Encodings : Boolean;
      --  This flag is set True if the name entry is known not to contain any
      --  special character encodings. This is used to speed up repeated calls
      --  to Get_Decoded_Name_String. A value of False means that it is not
      --  known whether the name contains any such encodings.

      Hash_Link : Name_Id;
      --  Link to next entry in names table for same hash code

      Int_Info : Int;
      --  Int Value associated with this name
   end record;

   for Name_Entry use record
      Name_Chars_Index      at  0 range 0 .. 31;
      Name_Len              at  4 range 0 .. 15;
      Byte_Info             at  6 range 0 .. 7;
      Name_Has_No_Encodings at  7 range 0 .. 7;
      Hash_Link             at  8 range 0 .. 31;
      Int_Info              at 12 range 0 .. 31;
   end record;

   for Name_Entry'Size use 16 * 8;
   --  This ensures that we did not leave out any fields

   --  This is the table that is referenced by Name_Id entries.
   --  It contains one entry for each unique name in the table.

   package Name_Entries is new Table.Table (
     Table_Component_Type => Name_Entry,
     Table_Index_Type     => Name_Id'Base,
     Table_Low_Bound      => First_Name_Id,
     Table_Initial        => Alloc.Names_Initial,
     Table_Increment      => Alloc.Names_Increment,
     Table_Name           => "Name_Entries");

end Namet;