/usr/lib/gcc-cross/x86_64-linux-gnu/6/adainclude/gnatvsn/scans.ads is in libgnatvsn6-dev-amd64-cross 6.4.0-17ubuntu1cross1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | ------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- S C A N S --
-- --
-- S p e c --
-- --
-- Copyright (C) 1992-2014, 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 Namet; use Namet;
with Types; use Types;
with Uintp; use Uintp;
with Urealp; use Urealp;
package Scans is
-- The scanner maintains a current state in the global variables defined
-- in this package. The call to the Scan routine advances this state to
-- the next token. The state is initialized by the call to one of the
-- initialization routines in Sinput.
-- The following type is used to identify token types returned by Scan.
-- The class column in this table indicates the token classes which
-- apply to the token, as defined by subsequent subtype declarations.
-- Note: Namet.Is_Keyword_Name depends on the fact that the first entry in
-- this type declaration is *not* for a reserved word. For details on why
-- there is this requirement, see Initialize_Ada_Keywords below.
type Token_Type is (
-- Token name Token type Class(es)
Tok_Integer_Literal, -- numeric lit Literal, Lit_Or_Name
Tok_Real_Literal, -- numeric lit Literal, Lit_Or_Name
Tok_String_Literal, -- string lit Literal. Lit_Or_Name
Tok_Char_Literal, -- char lit Name, Literal. Lit_Or_Name
Tok_Operator_Symbol, -- op symbol Name, Literal, Lit_Or_Name, Desig
Tok_Identifier, -- identifier Name, Lit_Or_Name, Desig
Tok_Double_Asterisk, -- **
Tok_Ampersand, -- & Binary_Addop
Tok_Minus, -- - Binary_Addop, Unary_Addop
Tok_Plus, -- + Binary_Addop, Unary_Addop
Tok_Asterisk, -- * Mulop
Tok_Mod, -- MOD Mulop
Tok_Rem, -- REM Mulop
Tok_Slash, -- / Mulop
Tok_New, -- NEW
Tok_Abs, -- ABS
Tok_Others, -- OTHERS
Tok_Null, -- NULL
-- Note: Tok_Raise is in no categories now, it used to be Cterm, Eterm,
-- After_SM, but now that Ada 2012 has added raise expressions, the
-- raise token can appear anywhere. Note in particular that Tok_Raise
-- being in Eterm stopped the parser from recognizing "return raise
-- exception-name". This degrades error recovery slightly, and perhaps
-- we could do better, but not worth the effort.
Tok_Raise, -- RAISE
Tok_Dot, -- . Namext
Tok_Apostrophe, -- ' Namext
Tok_Left_Paren, -- ( Namext, Consk
Tok_Delta, -- DELTA Atkwd, Sterm, Consk
Tok_Digits, -- DIGITS Atkwd, Sterm, Consk
Tok_Range, -- RANGE Atkwd, Sterm, Consk
Tok_Right_Paren, -- ) Sterm
Tok_Comma, -- , Sterm
Tok_And, -- AND Logop, Sterm
Tok_Or, -- OR Logop, Sterm
Tok_Xor, -- XOR Logop, Sterm
Tok_Less, -- < Relop, Sterm
Tok_Equal, -- = Relop, Sterm
Tok_Greater, -- > Relop, Sterm
Tok_Not_Equal, -- /= Relop, Sterm
Tok_Greater_Equal, -- >= Relop, Sterm
Tok_Less_Equal, -- <= Relop, Sterm
Tok_In, -- IN Relop, Sterm
Tok_Not, -- NOT Relop, Sterm
Tok_Box, -- <> Relop, Eterm, Sterm
Tok_Colon_Equal, -- := Eterm, Sterm
Tok_Colon, -- : Eterm, Sterm
Tok_Greater_Greater, -- >> Eterm, Sterm
Tok_Abstract, -- ABSTRACT Eterm, Sterm
Tok_Access, -- ACCESS Eterm, Sterm
Tok_Aliased, -- ALIASED Eterm, Sterm
Tok_All, -- ALL Eterm, Sterm
Tok_Array, -- ARRAY Eterm, Sterm
Tok_At, -- AT Eterm, Sterm
Tok_Body, -- BODY Eterm, Sterm
Tok_Constant, -- CONSTANT Eterm, Sterm
Tok_Do, -- DO Eterm, Sterm
Tok_Is, -- IS Eterm, Sterm
Tok_Interface, -- INTERFACE Eterm, Sterm
Tok_Limited, -- LIMITED Eterm, Sterm
Tok_Of, -- OF Eterm, Sterm
Tok_Out, -- OUT Eterm, Sterm
Tok_Record, -- RECORD Eterm, Sterm
Tok_Renames, -- RENAMES Eterm, Sterm
Tok_Reverse, -- REVERSE Eterm, Sterm
Tok_Some, -- SOME Eterm, Sterm
Tok_Tagged, -- TAGGED Eterm, Sterm
Tok_Then, -- THEN Eterm, Sterm
Tok_Less_Less, -- << Eterm, Sterm, After_SM
Tok_Abort, -- ABORT Eterm, Sterm, After_SM
Tok_Accept, -- ACCEPT Eterm, Sterm, After_SM
Tok_Case, -- CASE Eterm, Sterm, After_SM
Tok_Delay, -- DELAY Eterm, Sterm, After_SM
Tok_Else, -- ELSE Eterm, Sterm, After_SM
Tok_Elsif, -- ELSIF Eterm, Sterm, After_SM
Tok_End, -- END Eterm, Sterm, After_SM
Tok_Exception, -- EXCEPTION Eterm, Sterm, After_SM
Tok_Exit, -- EXIT Eterm, Sterm, After_SM
Tok_Goto, -- GOTO Eterm, Sterm, After_SM
Tok_If, -- IF Eterm, Sterm, After_SM
Tok_Pragma, -- PRAGMA Eterm, Sterm, After_SM
Tok_Requeue, -- REQUEUE Eterm, Sterm, After_SM
Tok_Return, -- RETURN Eterm, Sterm, After_SM
Tok_Select, -- SELECT Eterm, Sterm, After_SM
Tok_Terminate, -- TERMINATE Eterm, Sterm, After_SM
Tok_Until, -- UNTIL Eterm, Sterm, After_SM
Tok_When, -- WHEN Eterm, Sterm, After_SM
Tok_Begin, -- BEGIN Eterm, Sterm, After_SM, Labeled_Stmt
Tok_Declare, -- DECLARE Eterm, Sterm, After_SM, Labeled_Stmt
Tok_For, -- FOR Eterm, Sterm, After_SM, Labeled_Stmt
Tok_Loop, -- LOOP Eterm, Sterm, After_SM, Labeled_Stmt
Tok_While, -- WHILE Eterm, Sterm, After_SM, Labeled_Stmt
Tok_Entry, -- ENTRY Eterm, Sterm, Declk, Deckn, After_SM
Tok_Protected, -- PROTECTED Eterm, Sterm, Declk, Deckn, After_SM
Tok_Task, -- TASK Eterm, Sterm, Declk, Deckn, After_SM
Tok_Type, -- TYPE Eterm, Sterm, Declk, Deckn, After_SM
Tok_Subtype, -- SUBTYPE Eterm, Sterm, Declk, Deckn, After_SM
Tok_Overriding, -- OVERRIDING Eterm, Sterm, Declk, Declk, After_SM
Tok_Synchronized, -- SYNCHRONIZED Eterm, Sterm, Declk, Deckn, After_SM
Tok_Use, -- USE Eterm, Sterm, Declk, Deckn, After_SM
Tok_Function, -- FUNCTION Eterm, Sterm, Cunit, Declk, After_SM
Tok_Generic, -- GENERIC Eterm, Sterm, Cunit, Declk, After_SM
Tok_Package, -- PACKAGE Eterm, Sterm, Cunit, Declk, After_SM
Tok_Procedure, -- PROCEDURE Eterm, Sterm, Cunit, Declk, After_SM
Tok_Private, -- PRIVATE Eterm, Sterm, Cunit, After_SM
Tok_With, -- WITH Eterm, Sterm, Cunit, After_SM
Tok_Separate, -- SEPARATE Eterm, Sterm, Cunit, After_SM
Tok_EOF, -- End of file Eterm, Sterm, Cterm, After_SM
Tok_Semicolon, -- ; Eterm, Sterm, Cterm
Tok_Arrow, -- => Sterm, Cterm, Chtok
Tok_Vertical_Bar, -- | Cterm, Sterm, Chtok
Tok_Dot_Dot, -- .. Sterm, Chtok
Tok_Project,
Tok_Extends,
Tok_External,
Tok_External_As_List,
-- These four entries represent keywords for the project file language
-- and can be returned only in the case of scanning project files.
Tok_Comment,
-- This entry is used when scanning project files (where it represents
-- an entire comment), and in preprocessing with the -C switch set
-- (where it represents just the "--" of a comment). For the project
-- file case, the text of the comment is stored in Comment_Id.
Tok_End_Of_Line,
-- Represents an end of line. Not used during normal compilation scans
-- where end of line is ignored. Active for preprocessor scanning and
-- also when scanning project files (where it is needed because of ???)
Tok_Special,
-- Used only in preprocessor scanning (to represent one of the
-- characters '#', '$', '?', '@', '`', '\', '^', '~', or '_'. The
-- character value itself is stored in Scans.Special_Character.
Tok_SPARK_Hide,
-- HIDE directive in SPARK
No_Token);
-- No_Token is used for initializing Token values to indicate that
-- no value has been set yet.
-- Note: in the RM, operator symbol is a special case of string literal.
-- We distinguish at the lexical level in this compiler, since there are
-- many syntactic situations in which only an operator symbol is allowed.
-- The following subtype declarations group the token types into classes.
-- These are used for class tests in the parser.
subtype Token_Class_Numeric_Literal is
Token_Type range Tok_Integer_Literal .. Tok_Real_Literal;
-- Numeric literal
subtype Token_Class_Literal is
Token_Type range Tok_Integer_Literal .. Tok_Operator_Symbol;
-- Literal
subtype Token_Class_Lit_Or_Name is
Token_Type range Tok_Integer_Literal .. Tok_Identifier;
subtype Token_Class_Binary_Addop is
Token_Type range Tok_Ampersand .. Tok_Plus;
-- Binary adding operator (& + -)
subtype Token_Class_Unary_Addop is
Token_Type range Tok_Minus .. Tok_Plus;
-- Unary adding operator (+ -)
subtype Token_Class_Mulop is
Token_Type range Tok_Asterisk .. Tok_Slash;
-- Multiplying operator
subtype Token_Class_Logop is
Token_Type range Tok_And .. Tok_Xor;
-- Logical operator (and, or, xor)
subtype Token_Class_Relop is
Token_Type range Tok_Less .. Tok_Box;
-- Relational operator (= /= < <= > >= not, in plus <> to catch misuse
-- of Pascal style not equal operator).
subtype Token_Class_Name is
Token_Type range Tok_Char_Literal .. Tok_Identifier;
-- First token of name (4.1),
-- (identifier, char literal, operator symbol)
subtype Token_Class_Desig is
Token_Type range Tok_Operator_Symbol .. Tok_Identifier;
-- Token which can be a Designator (identifier, operator symbol)
subtype Token_Class_Namext is
Token_Type range Tok_Dot .. Tok_Left_Paren;
-- Name extension tokens. These are tokens which can appear immediately
-- after a name to extend it recursively (period, quote, left paren)
subtype Token_Class_Consk is
Token_Type range Tok_Left_Paren .. Tok_Range;
-- Keywords which can start constraint
-- (left paren, delta, digits, range)
subtype Token_Class_Eterm is
Token_Type range Tok_Colon_Equal .. Tok_Semicolon;
-- Expression terminators. These tokens can never appear within a simple
-- expression. This is used for error recovery purposes (if we encounter
-- an error in an expression, we simply scan to the next Eterm token).
subtype Token_Class_Sterm is
Token_Type range Tok_Delta .. Tok_Dot_Dot;
-- Simple_Expression terminators. A Simple_Expression must be followed
-- by a token in this class, or an error message is issued complaining
-- about a missing binary operator.
subtype Token_Class_Atkwd is
Token_Type range Tok_Delta .. Tok_Range;
-- Attribute keywords. This class includes keywords which can be used
-- as an Attribute_Designator, namely DELTA, DIGITS and RANGE
subtype Token_Class_Cterm is
Token_Type range Tok_EOF .. Tok_Vertical_Bar;
-- Choice terminators. These tokens terminate a choice. This is used for
-- error recovery purposes (if we encounter an error in a Choice, we
-- simply scan to the next Cterm token).
subtype Token_Class_Chtok is
Token_Type range Tok_Arrow .. Tok_Dot_Dot;
-- Choice tokens. These tokens signal a choice when used in an Aggregate
subtype Token_Class_Cunit is
Token_Type range Tok_Function .. Tok_Separate;
-- Tokens which can begin a compilation unit
subtype Token_Class_Declk is
Token_Type range Tok_Entry .. Tok_Procedure;
-- Keywords which start a declaration
subtype Token_Class_Deckn is
Token_Type range Tok_Entry .. Tok_Use;
-- Keywords which start a declaration but can't start a compilation unit
subtype Token_Class_After_SM is
Token_Type range Tok_Less_Less .. Tok_EOF;
-- Tokens which always, or almost always, appear after a semicolon. Used
-- in the Resync_Past_Semicolon routine to avoid gobbling up stuff when
-- a semicolon is missing. Of significance only for error recovery.
subtype Token_Class_Labeled_Stmt is
Token_Type range Tok_Begin .. Tok_While;
-- Tokens which start labeled statements
type Token_Flag_Array is array (Token_Type) of Boolean;
Is_Reserved_Keyword : constant Token_Flag_Array :=
Token_Flag_Array'
(Tok_Mod .. Tok_Rem => True,
Tok_New .. Tok_Null => True,
Tok_Delta .. Tok_Range => True,
Tok_And .. Tok_Xor => True,
Tok_In .. Tok_Not => True,
Tok_Abstract .. Tok_Then => True,
Tok_Abort .. Tok_Separate => True,
others => False);
-- Flag array used to test for reserved word
procedure Initialize_Ada_Keywords;
-- Set up Token_Type values in Names table entries for Ada reserved
-- words. This ignores Ada_Version; Ada_Version is taken into account in
-- Snames.Is_Keyword_Name.
--------------------------
-- Scan State Variables --
--------------------------
-- Note: these variables can only be referenced during the parsing of a
-- file. Reference to any of them from Sem or the expander is wrong.
-- These variables are initialized as required by Scn.Initialize_Scanner,
-- and should not be referenced before such a call. However, there are
-- situations in which these variables are saved and restored, and this
-- may happen before the first Initialize_Scanner call, resulting in the
-- assignment of invalid values. To avoid this, and allow building with
-- the -gnatVa switch, we initialize some variables to known valid values.
Scan_Ptr : Source_Ptr := No_Location; -- init for -gnatVa
-- Current scan pointer location. After a call to Scan, this points
-- just past the end of the token just scanned.
Token : Token_Type := No_Token; -- init for -gnatVa
-- Type of current token
Token_Ptr : Source_Ptr := No_Location; -- init for -gnatVa
-- Pointer to first character of current token
Current_Line_Start : Source_Ptr := No_Location; -- init for -gnatVa
-- Pointer to first character of line containing current token
Start_Column : Column_Number := No_Column_Number; -- init for -gnatVa
-- Starting column number (zero origin) of the first non-blank character
-- on the line containing the current token. This is used for error
-- recovery circuits which depend on looking at the column line up.
Type_Token_Location : Source_Ptr := No_Location; -- init for -gnatVa
-- Within a type declaration, gives the location of the TYPE keyword that
-- opened the type declaration. Used in checking the end column of a record
-- declaration, which can line up either with the TYPE keyword, or with the
-- start of the line containing the RECORD keyword.
Checksum : Word := 0; -- init for -gnatVa
-- Used to accumulate a CRC representing the tokens in the source
-- file being compiled. This CRC includes only program tokens, and
-- excludes comments.
First_Non_Blank_Location : Source_Ptr := No_Location; -- init for -gnatVa
-- Location of first non-blank character on the line containing the
-- current token (i.e. the location of the character whose column number
-- is stored in Start_Column).
Token_Node : Node_Id := Empty;
-- Node table Id for the current token. This is set only if the current
-- token is one for which the scanner constructs a node (i.e. it is an
-- identifier, operator symbol, or literal). For other token types,
-- Token_Node is undefined.
Token_Name : Name_Id := No_Name;
-- For identifiers, this is set to the Name_Id of the identifier scanned.
-- For all other tokens, Token_Name is set to Error_Name. Note that it
-- would be possible for the caller to extract this information from
-- Token_Node. We set Token_Name separately for two reasons. First it
-- allows a quicker test for a specific identifier. Second, it allows
-- a version of the parser to be built that does not build tree nodes,
-- usable as a syntax checker.
Prev_Token : Token_Type := No_Token;
-- Type of previous token
Prev_Token_Ptr : Source_Ptr;
-- Pointer to first character of previous token
Version_To_Be_Found : Boolean;
-- This flag is True if the scanner is still looking for an RCS version
-- number in a comment. Normally it is initialized to False so that this
-- circuit is not activated. If the -dv switch is set, then this flag is
-- initialized to True, and then reset when the version number is found.
-- We do things this way to minimize the impact on comment scanning.
Character_Code : Char_Code;
-- Valid only when Token is Tok_Char_Literal. Contains the value of the
-- scanned literal.
Real_Literal_Value : Ureal;
-- Valid only when Token is Tok_Real_Literal, contains the value of the
-- scanned literal.
Int_Literal_Value : Uint;
-- Valid only when Token = Tok_Integer_Literal, contains the value of the
-- scanned literal.
Based_Literal_Uses_Colon : Boolean;
-- Valid only when Token = Tok_Integer_Literal or Tok_Real_Literal. Set
-- True only for the case of a based literal using ':' instead of '#'.
String_Literal_Id : String_Id;
-- Valid only when Token = Tok_String_Literal or Tok_Operator_Symbol.
-- Contains the Id for currently scanned string value.
Wide_Character_Found : Boolean := False;
-- Valid only when Token = Tok_String_Literal. Set True if wide character
-- found (i.e. a character that does not fit in Character, but fits in
-- Wide_Wide_Character).
Wide_Wide_Character_Found : Boolean := False;
-- Valid only when Token = Tok_String_Literal. Set True if wide wide
-- character found (i.e. a character that does not fit in Character or
-- Wide_Character).
Special_Character : Character;
-- Valid only when Token = Tok_Special. Returns one of the characters
-- '#', '$', '?', '@', '`', '\', '^', '~', or '_'.
--
-- Why only this set? What about wide characters???
Comment_Id : Name_Id := No_Name;
-- Valid only when Token = Tok_Comment. Store the string that follows
-- the "--" of a comment when scanning project files.
--
-- Is it really right for this to be a Name rather than a String, what
-- about the case of Wide_Wide_Characters???
Inside_Depends : Boolean := False;
-- Flag set True for parsing the argument of a Depends pragma or aspect
-- (used to allow/require non-standard style rules for =>+ with -gnatyt).
Inside_If_Expression : Nat := 0;
-- This is a counter that is set non-zero while scanning out an if
-- expression (incremented on entry, decremented on exit). It is used to
-- disconnect format checks that normally apply to keywords THEN, ELSE etc.
--------------------------------------------------------
-- Procedures for Saving and Restoring the Scan State --
--------------------------------------------------------
-- The following procedures can be used to save and restore the entire
-- scan state. They are used in cases where it is necessary to backup
-- the scan during the parse.
type Saved_Scan_State is private;
-- Used for saving and restoring the scan state
procedure Save_Scan_State (Saved_State : out Saved_Scan_State);
pragma Inline (Save_Scan_State);
-- Saves the current scan state for possible later restoration. Note that
-- there is no harm in saving the state and then never restoring it.
procedure Restore_Scan_State (Saved_State : Saved_Scan_State);
pragma Inline (Restore_Scan_State);
-- Restores a scan state saved by a call to Save_Scan_State.
-- The saved scan state must refer to the current source file.
private
type Saved_Scan_State is record
Save_Scan_Ptr : Source_Ptr;
Save_Token : Token_Type;
Save_Token_Ptr : Source_Ptr;
Save_Current_Line_Start : Source_Ptr;
Save_Start_Column : Column_Number;
Save_Checksum : Word;
Save_First_Non_Blank_Location : Source_Ptr;
Save_Token_Node : Node_Id;
Save_Token_Name : Name_Id;
Save_Prev_Token : Token_Type;
Save_Prev_Token_Ptr : Source_Ptr;
end record;
end Scans;
|