1------------------------------------------------------------------------------ 2-- -- 3-- GNAT COMPILER COMPONENTS -- 4-- -- 5-- N A M E T -- 6-- -- 7-- S p e c -- 8-- -- 9-- Copyright (C) 1992-2013, 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 32with Alloc; 33with Table; 34with Hostparm; use Hostparm; 35with System; use System; 36with Types; use Types; 37 38package Namet is 39 40-- WARNING: There is a C version of this package. Any changes to this 41-- source file must be properly reflected in the C header file namet.h 42-- which is created manually from namet.ads and namet.adb. 43 44-- This package contains routines for handling the names table. The table 45-- is used to store character strings for identifiers and operator symbols, 46-- as well as other string values such as unit names and file names. 47 48-- The forms of the entries are as follows: 49 50-- Identifiers Stored with upper case letters folded to lower case. 51-- Upper half (16#80# bit set) and wide characters are 52-- stored in an encoded form (Uhh for upper half char, 53-- Whhhh for wide characters, WWhhhhhhhh as provided by 54-- the routine Store_Encoded_Character, where hh are hex 55-- digits for the character code using lower case a-f). 56-- Normally the use of U or W in other internal names is 57-- avoided, but these letters may be used in internal 58-- names (without this special meaning), if they appear 59-- as the last character of the name, or they are 60-- followed by an upper case letter (other than the WW 61-- sequence), or an underscore. 62 63-- Operator symbols Stored with an initial letter O, and the remainder 64-- of the name is the lower case characters XXX where 65-- the name is Name_Op_XXX, see Snames spec for a full 66-- list of the operator names. Normally the use of O 67-- in other internal names is avoided, but it may be 68-- used in internal names (without this special meaning) 69-- if it is the last character of the name, or if it is 70-- followed by an upper case letter or an underscore. 71 72-- Character literals Character literals have names that are used only for 73-- debugging and error message purposes. The form is an 74-- upper case Q followed by a single lower case letter, 75-- or by a Uxx/Wxxxx/WWxxxxxxx encoding as described for 76-- identifiers. The Set_Character_Literal_Name procedure 77-- should be used to construct these encodings. Normally 78-- the use of O in other internal names is avoided, but 79-- it may be used in internal names (without this special 80-- meaning) if it is the last character of the name, or 81-- if it is followed by an upper case letter or an 82-- underscore. 83 84-- Unit names Stored with upper case letters folded to lower case, 85-- using Uhh/Whhhh/WWhhhhhhhh encoding as described for 86-- identifiers, and a %s or %b suffix for specs/bodies. 87-- See package Uname for further details. 88 89-- File names Are stored in the form provided by Osint. Typically 90-- they may include wide character escape sequences and 91-- upper case characters (in non-encoded form). Casing 92-- is also derived from the external environment. Note 93-- that file names provided by Osint must generally be 94-- consistent with the names from Fname.Get_File_Name. 95 96-- Other strings The names table is also used as a convenient storage 97-- location for other variable length strings such as 98-- error messages etc. There are no restrictions on what 99-- characters may appear for such entries. 100 101-- Note: the encodings Uhh (upper half characters), Whhhh (wide characters), 102-- WWhhhhhhhh (wide wide characters) and Qx (character literal names) are 103-- described in the spec, since they are visible throughout the system (e.g. 104-- in debugging output). However, no code should depend on these particular 105-- encodings, so it should be possible to change the encodings by making 106-- changes only to the Namet specification (to change these comments) and the 107-- body (which actually implements the encodings). 108 109-- The names are hashed so that a given name appears only once in the table, 110-- except that names entered with Name_Enter as opposed to Name_Find are 111-- omitted from the hash table. 112 113-- The first 26 entries in the names table (with Name_Id values in the range 114-- First_Name_Id .. First_Name_Id + 25) represent names which are the one 115-- character lower case letters in the range a-z, and these names are created 116-- and initialized by the Initialize procedure. 117 118-- Two values, one of type Int and one of type Byte, are stored with each 119-- names table entry and subprograms are provided for setting and retrieving 120-- these associated values. The usage of these values is up to the client. In 121-- the compiler, the Int field is used to point to a chain of potentially 122-- visible entities (see Sem.Ch8 for details), and the Byte field is used to 123-- hold the Token_Type value for reserved words (see Sem for details). In the 124-- binder, the Byte field is unused, and the Int field is used in various 125-- ways depending on the name involved (see binder documentation). 126 127 Name_Buffer : String (1 .. 4 * Max_Line_Length); 128 -- This buffer is used to set the name to be stored in the table for the 129 -- Name_Find call, and to retrieve the name for the Get_Name_String call. 130 -- The limit here is intended to be an infinite value that ensures that we 131 -- never overflow the buffer (names this long are too absurd to worry). 132 133 Name_Len : Natural := 0; 134 -- Length of name stored in Name_Buffer. Used as an input parameter for 135 -- Name_Find, and as an output value by Get_Name_String, or Write_Name. 136 -- Note: in normal usage, all users of Name_Buffer/Name_Len are expected 137 -- to initialize Name_Len appropriately. The reason we preinitialize to 138 -- zero here is that some circuitry (e.g. Osint.Write_Program_Name) does 139 -- a save/restore on Name_Len and Name_Buffer (1 .. Name_Len), and we do 140 -- not want some arbitrary junk value to result in saving an arbitrarily 141 -- long slice which would waste time and blow the stack. 142 143 ----------------------------- 144 -- Types for Namet Package -- 145 ----------------------------- 146 147 -- Name_Id values are used to identify entries in the names table. Except 148 -- for the special values No_Name and Error_Name, they are subscript values 149 -- for the Names table defined in this package. 150 151 -- Note that with only a few exceptions, which are clearly documented, the 152 -- type Name_Id should be regarded as a private type. In particular it is 153 -- never appropriate to perform arithmetic operations using this type. 154 155 type Name_Id is range Names_Low_Bound .. Names_High_Bound; 156 for Name_Id'Size use 32; 157 -- Type used to identify entries in the names table 158 159 No_Name : constant Name_Id := Names_Low_Bound; 160 -- The special Name_Id value No_Name is used in the parser to indicate 161 -- a situation where no name is present (e.g. on a loop or block). 162 163 Error_Name : constant Name_Id := Names_Low_Bound + 1; 164 -- The special Name_Id value Error_Name is used in the parser to 165 -- indicate that some kind of error was encountered in scanning out 166 -- the relevant name, so it does not have a representable label. 167 168 subtype Error_Name_Or_No_Name is Name_Id range No_Name .. Error_Name; 169 -- Used to test for either error name or no name 170 171 First_Name_Id : constant Name_Id := Names_Low_Bound + 2; 172 -- Subscript of first entry in names table 173 174 ------------------------------ 175 -- Name_Id Membership Tests -- 176 ------------------------------ 177 178 -- The following functions allow a convenient notation for testing whether 179 -- a Name_Id value matches any one of a list of possible values. In each 180 -- case True is returned if the given T argument is equal to any of the V 181 -- arguments. These essentially duplicate the Ada 2012 membership tests, 182 -- but we cannot use the latter (yet) in the compiler front end, because 183 -- of bootstrap considerations 184 185 function Nam_In 186 (T : Name_Id; 187 V1 : Name_Id; 188 V2 : Name_Id) return Boolean; 189 190 function Nam_In 191 (T : Name_Id; 192 V1 : Name_Id; 193 V2 : Name_Id; 194 V3 : Name_Id) return Boolean; 195 196 function Nam_In 197 (T : Name_Id; 198 V1 : Name_Id; 199 V2 : Name_Id; 200 V3 : Name_Id; 201 V4 : Name_Id) return Boolean; 202 203 function Nam_In 204 (T : Name_Id; 205 V1 : Name_Id; 206 V2 : Name_Id; 207 V3 : Name_Id; 208 V4 : Name_Id; 209 V5 : Name_Id) return Boolean; 210 211 function Nam_In 212 (T : Name_Id; 213 V1 : Name_Id; 214 V2 : Name_Id; 215 V3 : Name_Id; 216 V4 : Name_Id; 217 V5 : Name_Id; 218 V6 : Name_Id) return Boolean; 219 220 function Nam_In 221 (T : Name_Id; 222 V1 : Name_Id; 223 V2 : Name_Id; 224 V3 : Name_Id; 225 V4 : Name_Id; 226 V5 : Name_Id; 227 V6 : Name_Id; 228 V7 : Name_Id) return Boolean; 229 230 pragma Inline (Nam_In); 231 -- Inline all above functions 232 233 ----------------- 234 -- Subprograms -- 235 ----------------- 236 237 procedure Finalize; 238 -- Called at the end of a use of the Namet package (before a subsequent 239 -- call to Initialize). Currently this routine is only used to generate 240 -- debugging output. 241 242 procedure Get_Name_String (Id : Name_Id); 243 -- Get_Name_String is used to retrieve the string associated with an entry 244 -- in the names table. The resulting string is stored in Name_Buffer and 245 -- Name_Len is set. It is an error to call Get_Name_String with one of the 246 -- special name Id values (No_Name or Error_Name). 247 248 function Get_Name_String (Id : Name_Id) return String; 249 -- This functional form returns the result as a string without affecting 250 -- the contents of either Name_Buffer or Name_Len. The lower bound is 1. 251 252 procedure Get_Unqualified_Name_String (Id : Name_Id); 253 -- Similar to the above except that qualification (as defined in unit 254 -- Exp_Dbug) is removed (including both preceding __ delimited names, and 255 -- also the suffixes used to indicate package body entities and to 256 -- distinguish between overloaded entities). Note that names are not 257 -- qualified until just before the call to gigi, so this routine is only 258 -- needed by processing that occurs after gigi has been called. This 259 -- includes all ASIS processing, since ASIS works on the tree written 260 -- after gigi has been called. 261 262 procedure Get_Name_String_And_Append (Id : Name_Id); 263 -- Like Get_Name_String but the resulting characters are appended to the 264 -- current contents of the entry stored in Name_Buffer, and Name_Len is 265 -- incremented to include the added characters. 266 267 procedure Get_Decoded_Name_String (Id : Name_Id); 268 -- Same calling sequence an interface as Get_Name_String, except that the 269 -- result is decoded, so that upper half characters and wide characters 270 -- appear as originally found in the source program text, operators have 271 -- their source forms (special characters and enclosed in quotes), and 272 -- character literals appear surrounded by apostrophes. 273 274 procedure Get_Unqualified_Decoded_Name_String (Id : Name_Id); 275 -- Similar to the above except that qualification (as defined in unit 276 -- Exp_Dbug) is removed (including both preceding __ delimited names, and 277 -- also the suffix used to indicate package body entities). Note that 278 -- names are not qualified until just before the call to gigi, so this 279 -- routine is only needed by processing that occurs after gigi has been 280 -- called. This includes all ASIS processing, since ASIS works on the tree 281 -- written after gigi has been called. 282 283 procedure Get_Decoded_Name_String_With_Brackets (Id : Name_Id); 284 -- This routine is similar to Decoded_Name, except that the brackets 285 -- notation (Uhh replaced by ["hh"], Whhhh replaced by ["hhhh"], 286 -- WWhhhhhhhh replaced by ["hhhhhhhh"]) is used for all non-lower half 287 -- characters, regardless of how Opt.Wide_Character_Encoding_Method is 288 -- set, and also in that characters in the range 16#80# .. 16#FF# are 289 -- converted to brackets notation in all cases. This routine can be used 290 -- when there is a requirement for a canonical representation not affected 291 -- by the character set options (e.g. in the binder generation of 292 -- symbols). 293 294 function Get_Name_Table_Byte (Id : Name_Id) return Byte; 295 pragma Inline (Get_Name_Table_Byte); 296 -- Fetches the Byte value associated with the given name 297 298 function Get_Name_Table_Info (Id : Name_Id) return Int; 299 pragma Inline (Get_Name_Table_Info); 300 -- Fetches the Int value associated with the given name 301 302 function Is_Operator_Name (Id : Name_Id) return Boolean; 303 -- Returns True if name given is of the form of an operator (that 304 -- is, it starts with an upper case O). 305 306 procedure Initialize; 307 -- This is a dummy procedure. It is retained for easy compatibility with 308 -- clients who used to call Initialize when this call was required. Now 309 -- initialization is performed automatically during package elaboration. 310 -- Note that this change fixes problems which existed prior to the change 311 -- of Initialize being called more than once. See also Reinitialize which 312 -- allows reinitialization of the tables. 313 314 procedure Lock; 315 -- Lock name tables before calling back end. We reserve some extra space 316 -- before locking to avoid unnecessary inefficiencies when we unlock. 317 318 procedure Reinitialize; 319 -- Clears the name tables and removes all existing entries from the table. 320 321 procedure Unlock; 322 -- Unlocks the name table to allow use of the extra space reserved by the 323 -- call to Lock. See gnat1drv for details of the need for this. 324 325 function Length_Of_Name (Id : Name_Id) return Nat; 326 pragma Inline (Length_Of_Name); 327 -- Returns length of given name in characters. This is the length of the 328 -- encoded name, as stored in the names table, the result is equivalent to 329 -- calling Get_Name_String and reading Name_Len, except that a call to 330 -- Length_Of_Name does not affect the contents of Name_Len and Name_Buffer. 331 332 function Name_Chars_Address return System.Address; 333 -- Return starting address of name characters table (used in Back_End call 334 -- to Gigi). 335 336 function Name_Find return Name_Id; 337 -- Name_Find is called with a string stored in Name_Buffer whose length is 338 -- in Name_Len (i.e. the characters of the name are in subscript positions 339 -- 1 to Name_Len in Name_Buffer). It searches the names table to see if 340 -- the string has already been stored. If so the Id of the existing entry 341 -- is returned. Otherwise a new entry is created with its Name_Table_Info 342 -- field set to zero. The contents of Name_Buffer and Name_Len are not 343 -- modified by this call. Note that it is permissible for Name_Len to be 344 -- set to zero to lookup the null name string. 345 346 function Name_Enter return Name_Id; 347 -- Name_Enter has the same calling interface as Name_Find. The difference 348 -- is that it does not search the table for an existing match, and also 349 -- subsequent Name_Find calls using the same name will not locate the 350 -- entry created by this call. Thus multiple calls to Name_Enter with the 351 -- same name will create multiple entries in the name table with different 352 -- Name_Id values. This is useful in the case of created names, which are 353 -- never expected to be looked up. Note: Name_Enter should never be used 354 -- for one character names, since these are efficiently located without 355 -- hashing by Name_Find in any case. 356 357 function Name_Entries_Address return System.Address; 358 -- Return starting address of Names table (used in Back_End call to Gigi) 359 360 function Name_Entries_Count return Nat; 361 -- Return current number of entries in the names table 362 363 function Is_OK_Internal_Letter (C : Character) return Boolean; 364 pragma Inline (Is_OK_Internal_Letter); 365 -- Returns true if C is a suitable character for using as a prefix or a 366 -- suffix of an internally generated name, i.e. it is an upper case letter 367 -- other than one of the ones used for encoding source names (currently 368 -- the set of reserved letters is O, Q, U, W) and also returns False for 369 -- the letter X, which is reserved for debug output (see Exp_Dbug). 370 371 function Is_Internal_Name (Id : Name_Id) return Boolean; 372 -- Returns True if the name is an internal name (i.e. contains a character 373 -- for which Is_OK_Internal_Letter is true, or if the name starts or ends 374 -- with an underscore. This call destroys the value of Name_Len and 375 -- Name_Buffer (it loads these as for Get_Name_String). 376 -- 377 -- Note: if the name is qualified (has a double underscore), then only the 378 -- final entity name is considered, not the qualifying names. Consider for 379 -- example that the name: 380 -- 381 -- pkg__B_1__xyz 382 -- 383 -- is not an internal name, because the B comes from the internal name of 384 -- a qualifying block, but the xyz means that this was indeed a declared 385 -- identifier called "xyz" within this block and there is nothing internal 386 -- about that name. 387 388 function Is_Internal_Name return Boolean; 389 -- Like the form with an Id argument, except that the name to be tested is 390 -- passed in Name_Buffer and Name_Len (which are not affected by the call). 391 -- Name_Buffer (it loads these as for Get_Name_String). 392 393 function Is_Valid_Name (Id : Name_Id) return Boolean; 394 -- True if Id is a valid name -- points to a valid entry in the 395 -- Name_Entries table. 396 397 procedure Reset_Name_Table; 398 -- This procedure is used when there are multiple source files to reset 399 -- the name table info entries associated with current entries in the 400 -- names table. There is no harm in keeping the names entries themselves 401 -- from one compilation to another, but we can't keep the entity info, 402 -- since this refers to tree nodes, which are destroyed between each main 403 -- source file. 404 405 procedure Add_Char_To_Name_Buffer (C : Character); 406 pragma Inline (Add_Char_To_Name_Buffer); 407 -- Add given character to the end of the string currently stored in the 408 -- Name_Buffer, incrementing Name_Len. 409 410 procedure Add_Nat_To_Name_Buffer (V : Nat); 411 -- Add decimal representation of given value to the end of the string 412 -- currently stored in Name_Buffer, incrementing Name_Len as required. 413 414 procedure Add_Str_To_Name_Buffer (S : String); 415 -- Add characters of string S to the end of the string currently stored 416 -- in the Name_Buffer, incrementing Name_Len by the length of the string. 417 418 procedure Insert_Str_In_Name_Buffer (S : String; Index : Positive); 419 -- Inserts given string in name buffer, starting at Index. Any existing 420 -- characters at or past this location get moved beyond the inserted string 421 -- and Name_Len is incremented by the length of the string. 422 423 procedure Set_Character_Literal_Name (C : Char_Code); 424 -- This procedure sets the proper encoded name for the character literal 425 -- for the given character code. On return Name_Buffer and Name_Len are 426 -- set to reflect the stored name. 427 428 procedure Set_Name_Table_Info (Id : Name_Id; Val : Int); 429 pragma Inline (Set_Name_Table_Info); 430 -- Sets the Int value associated with the given name 431 432 procedure Set_Name_Table_Byte (Id : Name_Id; Val : Byte); 433 pragma Inline (Set_Name_Table_Byte); 434 -- Sets the Byte value associated with the given name 435 436 procedure Store_Encoded_Character (C : Char_Code); 437 -- Stores given character code at the end of Name_Buffer, updating the 438 -- value in Name_Len appropriately. Lower case letters and digits are 439 -- stored unchanged. Other 8-bit characters are stored using the Uhh 440 -- encoding (hh = hex code), other 16-bit wide character values are stored 441 -- using the Whhhh (hhhh = hex code) encoding, and other 32-bit wide wide 442 -- character values are stored using the WWhhhhhhhh (hhhhhhhh = hex code). 443 -- Note that this procedure does not fold upper case letters (they are 444 -- stored using the Uhh encoding). If folding is required, it must be done 445 -- by the caller prior to the call. 446 447 procedure Tree_Read; 448 -- Initializes internal tables from current tree file using the relevant 449 -- Table.Tree_Read routines. Note that Initialize should not be called if 450 -- Tree_Read is used. Tree_Read includes all necessary initialization. 451 452 procedure Tree_Write; 453 -- Writes out internal tables to current tree file using the relevant 454 -- Table.Tree_Write routines. 455 456 procedure Get_Last_Two_Chars (N : Name_Id; C1, C2 : out Character); 457 -- Obtains last two characters of a name. C1 is last but one character 458 -- and C2 is last character. If name is less than two characters long, 459 -- then both C1 and C2 are set to ASCII.NUL on return. 460 461 procedure Write_Name (Id : Name_Id); 462 -- Write_Name writes the characters of the specified name using the 463 -- standard output procedures in package Output. No end of line is 464 -- written, just the characters of the name. On return Name_Buffer and 465 -- Name_Len are set as for a call to Get_Name_String. The name is written 466 -- in encoded form (i.e. including Uhh, Whhh, Qx, _op as they appear in 467 -- the name table). If Id is Error_Name, or No_Name, no text is output. 468 469 procedure Write_Name_Decoded (Id : Name_Id); 470 -- Like Write_Name, except that the name written is the decoded name, as 471 -- described for Get_Decoded_Name_String, and the resulting value stored 472 -- in Name_Len and Name_Buffer is the decoded name. 473 474 ------------------------------ 475 -- File and Unit Name Types -- 476 ------------------------------ 477 478 -- These are defined here in Namet rather than Fname and Uname to avoid 479 -- problems with dependencies, and to avoid dragging in Fname and Uname 480 -- into many more files, but it would be cleaner to move to Fname/Uname. 481 482 type File_Name_Type is new Name_Id; 483 -- File names are stored in the names table and this type is used to 484 -- indicate that a Name_Id value is being used to hold a simple file name 485 -- (which does not include any directory information). 486 487 No_File : constant File_Name_Type := File_Name_Type (No_Name); 488 -- Constant used to indicate no file is present (this is used for example 489 -- when a search for a file indicates that no file of the name exists). 490 491 Error_File_Name : constant File_Name_Type := File_Name_Type (Error_Name); 492 -- The special File_Name_Type value Error_File_Name is used to indicate 493 -- a unit name where some previous processing has found an error. 494 495 subtype Error_File_Name_Or_No_File is 496 File_Name_Type range No_File .. Error_File_Name; 497 -- Used to test for either error file name or no file 498 499 type Path_Name_Type is new Name_Id; 500 -- Path names are stored in the names table and this type is used to 501 -- indicate that a Name_Id value is being used to hold a path name (that 502 -- may contain directory information). 503 504 No_Path : constant Path_Name_Type := Path_Name_Type (No_Name); 505 -- Constant used to indicate no path name is present 506 507 type Unit_Name_Type is new Name_Id; 508 -- Unit names are stored in the names table and this type is used to 509 -- indicate that a Name_Id value is being used to hold a unit name, which 510 -- terminates in %b for a body or %s for a spec. 511 512 No_Unit_Name : constant Unit_Name_Type := Unit_Name_Type (No_Name); 513 -- Constant used to indicate no file name present 514 515 Error_Unit_Name : constant Unit_Name_Type := Unit_Name_Type (Error_Name); 516 -- The special Unit_Name_Type value Error_Unit_Name is used to indicate 517 -- a unit name where some previous processing has found an error. 518 519 subtype Error_Unit_Name_Or_No_Unit_Name is 520 Unit_Name_Type range No_Unit_Name .. Error_Unit_Name; 521 522 ------------------------ 523 -- Debugging Routines -- 524 ------------------------ 525 526 procedure wn (Id : Name_Id); 527 pragma Export (Ada, wn); 528 -- This routine is intended for debugging use only (i.e. it is intended to 529 -- be called from the debugger). It writes the characters of the specified 530 -- name using the standard output procedures in package Output, followed by 531 -- a new line. The name is written in encoded form (i.e. including Uhh, 532 -- Whhh, Qx, _op as they appear in the name table). If Id is Error_Name, 533 -- No_Name, or invalid an appropriate string is written (<Error_Name>, 534 -- <No_Name>, <invalid name>). Unlike Write_Name, this call does not affect 535 -- the contents of Name_Buffer or Name_Len. 536 537 --------------------------- 538 -- Table Data Structures -- 539 --------------------------- 540 541 -- The following declarations define the data structures used to store 542 -- names. The definitions are in the private part of the package spec, 543 -- rather than the body, since they are referenced directly by gigi. 544 545private 546 547 -- This table stores the actual string names. Although logically there is 548 -- no need for a terminating character (since the length is stored in the 549 -- name entry table), we still store a NUL character at the end of every 550 -- name (for convenience in interfacing to the C world). 551 552 package Name_Chars is new Table.Table ( 553 Table_Component_Type => Character, 554 Table_Index_Type => Int, 555 Table_Low_Bound => 0, 556 Table_Initial => Alloc.Name_Chars_Initial, 557 Table_Increment => Alloc.Name_Chars_Increment, 558 Table_Name => "Name_Chars"); 559 560 type Name_Entry is record 561 Name_Chars_Index : Int; 562 -- Starting location of characters in the Name_Chars table minus one 563 -- (i.e. pointer to character just before first character). The reason 564 -- for the bias of one is that indexes in Name_Buffer are one's origin, 565 -- so this avoids unnecessary adds and subtracts of 1. 566 567 Name_Len : Short; 568 -- Length of this name in characters 569 570 Byte_Info : Byte; 571 -- Byte value associated with this name 572 573 Name_Has_No_Encodings : Boolean; 574 -- This flag is set True if the name entry is known not to contain any 575 -- special character encodings. This is used to speed up repeated calls 576 -- to Get_Decoded_Name_String. A value of False means that it is not 577 -- known whether the name contains any such encodings. 578 579 Hash_Link : Name_Id; 580 -- Link to next entry in names table for same hash code 581 582 Int_Info : Int; 583 -- Int Value associated with this name 584 end record; 585 586 for Name_Entry use record 587 Name_Chars_Index at 0 range 0 .. 31; 588 Name_Len at 4 range 0 .. 15; 589 Byte_Info at 6 range 0 .. 7; 590 Name_Has_No_Encodings at 7 range 0 .. 7; 591 Hash_Link at 8 range 0 .. 31; 592 Int_Info at 12 range 0 .. 31; 593 end record; 594 595 for Name_Entry'Size use 16 * 8; 596 -- This ensures that we did not leave out any fields 597 598 -- This is the table that is referenced by Name_Id entries. 599 -- It contains one entry for each unique name in the table. 600 601 package Name_Entries is new Table.Table ( 602 Table_Component_Type => Name_Entry, 603 Table_Index_Type => Name_Id'Base, 604 Table_Low_Bound => First_Name_Id, 605 Table_Initial => Alloc.Names_Initial, 606 Table_Increment => Alloc.Names_Increment, 607 Table_Name => "Name_Entries"); 608 609end Namet; 610