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PR c++/54038
[official-gcc.git] / gcc / ada / par-prag.adb
blobe0834764865d9f9d8f3808544702b00ea8816c7c
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT COMPILER COMPONENTS --
4 -- --
5 -- P A R . P R A G --
6 -- --
7 -- B o d y --
8 -- --
9 -- Copyright (C) 1992-2012, 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. 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 COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
20 -- --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
23 -- --
24 ------------------------------------------------------------------------------
25
26 -- Generally the parser checks the basic syntax of pragmas, but does not
27 -- do specialized syntax checks for individual pragmas, these are deferred
28 -- to semantic analysis time (see unit Sem_Prag). There are some pragmas
29 -- which require recognition and either partial or complete processing
30 -- during parsing, and this unit performs this required processing.
31
32 with Fname.UF; use Fname.UF;
33 with Osint; use Osint;
34 with Rident; use Rident;
35 with Restrict; use Restrict;
36 with Stringt; use Stringt;
37 with Stylesw; use Stylesw;
38 with Uintp; use Uintp;
39 with Uname; use Uname;
40
41 with System.WCh_Con; use System.WCh_Con;
42
43 separate (Par)
44
45 function Prag (Pragma_Node : Node_Id; Semi : Source_Ptr) return Node_Id is
46 Prag_Name : constant Name_Id := Pragma_Name (Pragma_Node);
47 Prag_Id : constant Pragma_Id := Get_Pragma_Id (Prag_Name);
48 Pragma_Sloc : constant Source_Ptr := Sloc (Pragma_Node);
49 Arg_Count : Nat;
50 Arg_Node : Node_Id;
51
52 -----------------------
53 -- Local Subprograms --
54 -----------------------
55
56 function Arg1 return Node_Id;
57 function Arg2 return Node_Id;
58 function Arg3 return Node_Id;
59 -- Obtain specified Pragma_Argument_Association. It is allowable to call
60 -- the routine for the argument one past the last present argument, but
61 -- that is the only case in which a non-present argument can be referenced.
62
63 procedure Check_Arg_Count (Required : Int);
64 -- Check argument count for pragma = Required. If not give error and raise
65 -- Error_Resync.
66
67 procedure Check_Arg_Is_String_Literal (Arg : Node_Id);
68 -- Check the expression of the specified argument to make sure that it
69 -- is a string literal. If not give error and raise Error_Resync.
70
71 procedure Check_Arg_Is_On_Or_Off (Arg : Node_Id);
72 -- Check the expression of the specified argument to make sure that it
73 -- is an identifier which is either ON or OFF, and if not, then issue
74 -- an error message and raise Error_Resync.
75
76 procedure Check_No_Identifier (Arg : Node_Id);
77 -- Checks that the given argument does not have an identifier. If
78 -- an identifier is present, then an error message is issued, and
79 -- Error_Resync is raised.
80
81 procedure Check_Optional_Identifier (Arg : Node_Id; Id : Name_Id);
82 -- Checks if the given argument has an identifier, and if so, requires
83 -- it to match the given identifier name. If there is a non-matching
84 -- identifier, then an error message is given and Error_Resync raised.
85
86 procedure Check_Required_Identifier (Arg : Node_Id; Id : Name_Id);
87 -- Same as Check_Optional_Identifier, except that the name is required
88 -- to be present and to match the given Id value.
89
90 procedure Process_Restrictions_Or_Restriction_Warnings;
91 -- Common processing for Restrictions and Restriction_Warnings pragmas.
92 -- For the most part, restrictions need not be processed at parse time,
93 -- since they only affect semantic processing. This routine handles the
94 -- exceptions as follows
95 --
96 -- No_Obsolescent_Features must be processed at parse time, since there
97 -- are some obsolescent features (e.g. character replacements) which are
98 -- handled at parse time.
99 --
100 -- SPARK must be processed at parse time, since this restriction controls
101 -- whether the scanner recognizes a spark HIDE directive formatted as an
102 -- Ada comment (and generates a Tok_SPARK_Hide token for the directive).
103 --
104 -- No_Dependence must be processed at parse time, since otherwise it gets
105 -- handled too late.
106 --
107 -- Note that we don't need to do full error checking for badly formed cases
108 -- of restrictions, since these will be caught during semantic analysis.
109
110 ----------
111 -- Arg1 --
112 ----------
113
114 function Arg1 return Node_Id is
115 begin
116 return First (Pragma_Argument_Associations (Pragma_Node));
117 end Arg1;
118
119 ----------
120 -- Arg2 --
121 ----------
122
123 function Arg2 return Node_Id is
124 begin
125 return Next (Arg1);
126 end Arg2;
127
128 ----------
129 -- Arg3 --
130 ----------
131
132 function Arg3 return Node_Id is
133 begin
134 return Next (Arg2);
135 end Arg3;
136
137 ---------------------
138 -- Check_Arg_Count --
139 ---------------------
140
141 procedure Check_Arg_Count (Required : Int) is
142 begin
143 if Arg_Count /= Required then
144 Error_Msg ("wrong number of arguments for pragma%", Pragma_Sloc);
145 raise Error_Resync;
146 end if;
147 end Check_Arg_Count;
148
149 ----------------------------
150 -- Check_Arg_Is_On_Or_Off --
151 ----------------------------
152
153 procedure Check_Arg_Is_On_Or_Off (Arg : Node_Id) is
154 Argx : constant Node_Id := Expression (Arg);
155
156 begin
157 if Nkind (Expression (Arg)) /= N_Identifier
158 or else (Chars (Argx) /= Name_On
159 and then
160 Chars (Argx) /= Name_Off)
161 then
162 Error_Msg_Name_2 := Name_On;
163 Error_Msg_Name_3 := Name_Off;
164
165 Error_Msg ("argument for pragma% must be% or%", Sloc (Argx));
166 raise Error_Resync;
167 end if;
168 end Check_Arg_Is_On_Or_Off;
169
170 ---------------------------------
171 -- Check_Arg_Is_String_Literal --
172 ---------------------------------
173
174 procedure Check_Arg_Is_String_Literal (Arg : Node_Id) is
175 begin
176 if Nkind (Expression (Arg)) /= N_String_Literal then
177 Error_Msg
178 ("argument for pragma% must be string literal",
179 Sloc (Expression (Arg)));
180 raise Error_Resync;
181 end if;
182 end Check_Arg_Is_String_Literal;
183
184 -------------------------
185 -- Check_No_Identifier --
186 -------------------------
187
188 procedure Check_No_Identifier (Arg : Node_Id) is
189 begin
190 if Chars (Arg) /= No_Name then
191 Error_Msg_N ("pragma% does not permit named arguments", Arg);
192 raise Error_Resync;
193 end if;
194 end Check_No_Identifier;
195
196 -------------------------------
197 -- Check_Optional_Identifier --
198 -------------------------------
199
200 procedure Check_Optional_Identifier (Arg : Node_Id; Id : Name_Id) is
201 begin
202 if Present (Arg) and then Chars (Arg) /= No_Name then
203 if Chars (Arg) /= Id then
204 Error_Msg_Name_2 := Id;
205 Error_Msg_N ("pragma% argument expects identifier%", Arg);
206 end if;
207 end if;
208 end Check_Optional_Identifier;
209
210 -------------------------------
211 -- Check_Required_Identifier --
212 -------------------------------
213
214 procedure Check_Required_Identifier (Arg : Node_Id; Id : Name_Id) is
215 begin
216 if Chars (Arg) /= Id then
217 Error_Msg_Name_2 := Id;
218 Error_Msg_N ("pragma% argument must have identifier%", Arg);
219 end if;
220 end Check_Required_Identifier;
221
222 --------------------------------------------------
223 -- Process_Restrictions_Or_Restriction_Warnings --
224 --------------------------------------------------
225
226 procedure Process_Restrictions_Or_Restriction_Warnings is
227 Arg : Node_Id;
228 Id : Name_Id;
229 Expr : Node_Id;
230
231 begin
232 Arg := Arg1;
233 while Present (Arg) loop
234 Id := Chars (Arg);
235 Expr := Expression (Arg);
236
237 if Id = No_Name
238 and then Nkind (Expr) = N_Identifier
239 then
240 case Get_Restriction_Id (Chars (Expr)) is
241 when No_Obsolescent_Features =>
242 Set_Restriction (No_Obsolescent_Features, Pragma_Node);
243 Restriction_Warnings (No_Obsolescent_Features) :=
244 Prag_Id = Pragma_Restriction_Warnings;
245
246 when SPARK =>
247 Set_Restriction (SPARK, Pragma_Node);
248 Restriction_Warnings (SPARK) :=
249 Prag_Id = Pragma_Restriction_Warnings;
250
251 when others =>
252 null;
253 end case;
254
255 elsif Id = Name_No_Dependence then
256 Set_Restriction_No_Dependence
257 (Unit => Expr,
258 Warn => Prag_Id = Pragma_Restriction_Warnings
259 or else Treat_Restrictions_As_Warnings);
260 end if;
261
262 Next (Arg);
263 end loop;
264 end Process_Restrictions_Or_Restriction_Warnings;
265
266 -- Start of processing for Prag
267
268 begin
269 Error_Msg_Name_1 := Prag_Name;
270
271 -- Ignore unrecognized pragma. We let Sem post the warning for this, since
272 -- it is a semantic error, not a syntactic one (we have already checked
273 -- the syntax for the unrecognized pragma as required by (RM 2.8(11)).
274
275 if Prag_Id = Unknown_Pragma then
276 return Pragma_Node;
277 end if;
278
279 -- Count number of arguments. This loop also checks if any of the arguments
280 -- are Error, indicating a syntax error as they were parsed. If so, we
281 -- simply return, because we get into trouble with cascaded errors if we
282 -- try to perform our error checks on junk arguments.
283
284 Arg_Count := 0;
285
286 if Present (Pragma_Argument_Associations (Pragma_Node)) then
287 Arg_Node := Arg1;
288 while Arg_Node /= Empty loop
289 Arg_Count := Arg_Count + 1;
290
291 if Expression (Arg_Node) = Error then
292 return Error;
293 end if;
294
295 Next (Arg_Node);
296 end loop;
297 end if;
298
299 -- Remaining processing is pragma dependent
300
301 case Prag_Id is
302
303 ------------
304 -- Ada_83 --
305 ------------
306
307 -- This pragma must be processed at parse time, since we want to set
308 -- the Ada version properly at parse time to recognize the appropriate
309 -- Ada version syntax.
310
311 when Pragma_Ada_83 =>
312 Ada_Version := Ada_83;
313 Ada_Version_Explicit := Ada_83;
314
315 ------------
316 -- Ada_95 --
317 ------------
318
319 -- This pragma must be processed at parse time, since we want to set
320 -- the Ada version properly at parse time to recognize the appropriate
321 -- Ada version syntax.
322
323 when Pragma_Ada_95 =>
324 Ada_Version := Ada_95;
325 Ada_Version_Explicit := Ada_95;
326
327 ---------------------
328 -- Ada_05/Ada_2005 --
329 ---------------------
330
331 -- These pragmas must be processed at parse time, since we want to set
332 -- the Ada version properly at parse time to recognize the appropriate
333 -- Ada version syntax. However, it is only the zero argument form that
334 -- must be processed at parse time.
335
336 when Pragma_Ada_05 | Pragma_Ada_2005 =>
337 if Arg_Count = 0 then
338 Ada_Version := Ada_2005;
339 Ada_Version_Explicit := Ada_2005;
340 end if;
341
342 ---------------------
343 -- Ada_12/Ada_2012 --
344 ---------------------
345
346 -- These pragmas must be processed at parse time, since we want to set
347 -- the Ada version properly at parse time to recognize the appropriate
348 -- Ada version syntax. However, it is only the zero argument form that
349 -- must be processed at parse time.
350
351 when Pragma_Ada_12 | Pragma_Ada_2012 =>
352 if Arg_Count = 0 then
353 Ada_Version := Ada_2012;
354 Ada_Version_Explicit := Ada_2012;
355 end if;
356
357 -----------
358 -- Debug --
359 -----------
360
361 -- pragma Debug ([boolean_EXPRESSION,] PROCEDURE_CALL_STATEMENT);
362
363 when Pragma_Debug =>
364 Check_No_Identifier (Arg1);
365
366 if Arg_Count = 2 then
367 Check_No_Identifier (Arg2);
368 else
369 Check_Arg_Count (1);
370 end if;
371
372 -------------------------------
373 -- Extensions_Allowed (GNAT) --
374 -------------------------------
375
376 -- pragma Extensions_Allowed (Off | On)
377
378 -- The processing for pragma Extensions_Allowed must be done at
379 -- parse time, since extensions mode may affect what is accepted.
380
381 when Pragma_Extensions_Allowed =>
382 Check_Arg_Count (1);
383 Check_No_Identifier (Arg1);
384 Check_Arg_Is_On_Or_Off (Arg1);
385
386 if Chars (Expression (Arg1)) = Name_On then
387 Extensions_Allowed := True;
388 Ada_Version := Ada_2012;
389 else
390 Extensions_Allowed := False;
391 Ada_Version := Ada_Version_Explicit;
392 end if;
393
394 ----------------
395 -- List (2.8) --
396 ----------------
397
398 -- pragma List (Off | On)
399
400 -- The processing for pragma List must be done at parse time,
401 -- since a listing can be generated in parse only mode.
402
403 when Pragma_List =>
404 Check_Arg_Count (1);
405 Check_No_Identifier (Arg1);
406 Check_Arg_Is_On_Or_Off (Arg1);
407
408 -- We unconditionally make a List_On entry for the pragma, so that
409 -- in the List (Off) case, the pragma will print even in a region
410 -- of code with listing turned off (this is required!)
411
412 List_Pragmas.Increment_Last;
413 List_Pragmas.Table (List_Pragmas.Last) :=
414 (Ptyp => List_On, Ploc => Sloc (Pragma_Node));
415
416 -- Now generate the list off entry for pragma List (Off)
417
418 if Chars (Expression (Arg1)) = Name_Off then
419 List_Pragmas.Increment_Last;
420 List_Pragmas.Table (List_Pragmas.Last) :=
421 (Ptyp => List_Off, Ploc => Semi);
422 end if;
423
424 ----------------
425 -- Page (2.8) --
426 ----------------
427
428 -- pragma Page;
429
430 -- Processing for this pragma must be done at parse time, since a
431 -- listing can be generated in parse only mode with semantics off.
432
433 when Pragma_Page =>
434 Check_Arg_Count (0);
435 List_Pragmas.Increment_Last;
436 List_Pragmas.Table (List_Pragmas.Last) := (Page, Semi);
437
438 ------------------
439 -- Restrictions --
440 ------------------
441
442 -- pragma Restrictions (RESTRICTION {, RESTRICTION});
443
444 -- RESTRICTION ::=
445 -- restriction_IDENTIFIER
446 -- | restriction_parameter_IDENTIFIER => EXPRESSION
447
448 -- We process the case of No_Obsolescent_Features, since this has
449 -- a syntactic effect that we need to detect at parse time (the use
450 -- of replacement characters such as colon for pound sign).
451
452 when Pragma_Restrictions =>
453 Process_Restrictions_Or_Restriction_Warnings;
454
455 --------------------------
456 -- Restriction_Warnings --
457 --------------------------
458
459 -- pragma Restriction_Warnings (RESTRICTION {, RESTRICTION});
460
461 -- RESTRICTION ::=
462 -- restriction_IDENTIFIER
463 -- | restriction_parameter_IDENTIFIER => EXPRESSION
464
465 -- See above comment for pragma Restrictions
466
467 when Pragma_Restriction_Warnings =>
468 Process_Restrictions_Or_Restriction_Warnings;
469
470 ----------------------------------------------------------
471 -- Source_File_Name and Source_File_Name_Project (GNAT) --
472 ----------------------------------------------------------
473
474 -- These two pragmas have the same syntax and semantics.
475 -- There are five forms of these pragmas:
476
477 -- pragma Source_File_Name[_Project] (
478 -- [UNIT_NAME =>] unit_NAME,
479 -- BODY_FILE_NAME => STRING_LITERAL
480 -- [, [INDEX =>] INTEGER_LITERAL]);
481
482 -- pragma Source_File_Name[_Project] (
483 -- [UNIT_NAME =>] unit_NAME,
484 -- SPEC_FILE_NAME => STRING_LITERAL
485 -- [, [INDEX =>] INTEGER_LITERAL]);
486
487 -- pragma Source_File_Name[_Project] (
488 -- BODY_FILE_NAME => STRING_LITERAL
489 -- [, DOT_REPLACEMENT => STRING_LITERAL]
490 -- [, CASING => CASING_SPEC]);
491
492 -- pragma Source_File_Name[_Project] (
493 -- SPEC_FILE_NAME => STRING_LITERAL
494 -- [, DOT_REPLACEMENT => STRING_LITERAL]
495 -- [, CASING => CASING_SPEC]);
496
497 -- pragma Source_File_Name[_Project] (
498 -- SUBUNIT_FILE_NAME => STRING_LITERAL
499 -- [, DOT_REPLACEMENT => STRING_LITERAL]
500 -- [, CASING => CASING_SPEC]);
501
502 -- CASING_SPEC ::= Uppercase | Lowercase | Mixedcase
503
504 -- Pragma Source_File_Name_Project (SFNP) is equivalent to pragma
505 -- Source_File_Name (SFN), however their usage is exclusive:
506 -- SFN can only be used when no project file is used, while
507 -- SFNP can only be used when a project file is used.
508
509 -- The Project Manager produces a configuration pragmas file that
510 -- is communicated to the compiler with -gnatec switch. This file
511 -- contains only SFNP pragmas (at least two for the default naming
512 -- scheme. As this configuration pragmas file is always the first
513 -- processed by the compiler, it prevents the use of pragmas SFN in
514 -- other config files when a project file is in use.
515
516 -- Note: we process this during parsing, since we need to have the
517 -- source file names set well before the semantic analysis starts,
518 -- since we load the spec and with'ed packages before analysis.
519
520 when Pragma_Source_File_Name | Pragma_Source_File_Name_Project =>
521 Source_File_Name : declare
522 Unam : Unit_Name_Type;
523 Expr1 : Node_Id;
524 Pat : String_Ptr;
525 Typ : Character;
526 Dot : String_Ptr;
527 Cas : Casing_Type;
528 Nast : Nat;
529 Expr : Node_Id;
530 Index : Nat;
531
532 function Get_Fname (Arg : Node_Id) return File_Name_Type;
533 -- Process file name from unit name form of pragma
534
535 function Get_String_Argument (Arg : Node_Id) return String_Ptr;
536 -- Process string literal value from argument
537
538 procedure Process_Casing (Arg : Node_Id);
539 -- Process Casing argument of pattern form of pragma
540
541 procedure Process_Dot_Replacement (Arg : Node_Id);
542 -- Process Dot_Replacement argument of pattern form of pragma
543
544 ---------------
545 -- Get_Fname --
546 ---------------
547
548 function Get_Fname (Arg : Node_Id) return File_Name_Type is
549 begin
550 String_To_Name_Buffer (Strval (Expression (Arg)));
551
552 for J in 1 .. Name_Len loop
553 if Is_Directory_Separator (Name_Buffer (J)) then
554 Error_Msg
555 ("directory separator character not allowed",
556 Sloc (Expression (Arg)) + Source_Ptr (J));
557 end if;
558 end loop;
559
560 return Name_Find;
561 end Get_Fname;
562
563 -------------------------
564 -- Get_String_Argument --
565 -------------------------
566
567 function Get_String_Argument (Arg : Node_Id) return String_Ptr is
568 Str : String_Id;
569
570 begin
571 if Nkind (Expression (Arg)) /= N_String_Literal
572 and then
573 Nkind (Expression (Arg)) /= N_Operator_Symbol
574 then
575 Error_Msg_N
576 ("argument for pragma% must be string literal", Arg);
577 raise Error_Resync;
578 end if;
579
580 Str := Strval (Expression (Arg));
581
582 -- Check string has no wide chars
583
584 for J in 1 .. String_Length (Str) loop
585 if Get_String_Char (Str, J) > 255 then
586 Error_Msg
587 ("wide character not allowed in pattern for pragma%",
588 Sloc (Expression (Arg2)) + Text_Ptr (J) - 1);
589 end if;
590 end loop;
591
592 -- Acquire string
593
594 String_To_Name_Buffer (Str);
595 return new String'(Name_Buffer (1 .. Name_Len));
596 end Get_String_Argument;
597
598 --------------------
599 -- Process_Casing --
600 --------------------
601
602 procedure Process_Casing (Arg : Node_Id) is
603 Expr : constant Node_Id := Expression (Arg);
604
605 begin
606 Check_Required_Identifier (Arg, Name_Casing);
607
608 if Nkind (Expr) = N_Identifier then
609 if Chars (Expr) = Name_Lowercase then
610 Cas := All_Lower_Case;
611 return;
612 elsif Chars (Expr) = Name_Uppercase then
613 Cas := All_Upper_Case;
614 return;
615 elsif Chars (Expr) = Name_Mixedcase then
616 Cas := Mixed_Case;
617 return;
618 end if;
619 end if;
620
621 Error_Msg_N
622 ("Casing argument for pragma% must be " &
623 "one of Mixedcase, Lowercase, Uppercase",
624 Arg);
625 end Process_Casing;
626
627 -----------------------------
628 -- Process_Dot_Replacement --
629 -----------------------------
630
631 procedure Process_Dot_Replacement (Arg : Node_Id) is
632 begin
633 Check_Required_Identifier (Arg, Name_Dot_Replacement);
634 Dot := Get_String_Argument (Arg);
635 end Process_Dot_Replacement;
636
637 -- Start of processing for Source_File_Name and
638 -- Source_File_Name_Project pragmas.
639
640 begin
641 if Prag_Id = Pragma_Source_File_Name then
642 if Project_File_In_Use = In_Use then
643 Error_Msg
644 ("pragma Source_File_Name cannot be used " &
645 "with a project file", Pragma_Sloc);
646
647 else
648 Project_File_In_Use := Not_In_Use;
649 end if;
650
651 else
652 if Project_File_In_Use = Not_In_Use then
653 Error_Msg
654 ("pragma Source_File_Name_Project should only be used " &
655 "with a project file", Pragma_Sloc);
656 else
657 Project_File_In_Use := In_Use;
658 end if;
659 end if;
660
661 -- We permit from 1 to 3 arguments
662
663 if Arg_Count not in 1 .. 3 then
664 Check_Arg_Count (1);
665 end if;
666
667 Expr1 := Expression (Arg1);
668
669 -- If first argument is identifier or selected component, then
670 -- we have the specific file case of the Source_File_Name pragma,
671 -- and the first argument is a unit name.
672
673 if Nkind (Expr1) = N_Identifier
674 or else
675 (Nkind (Expr1) = N_Selected_Component
676 and then
677 Nkind (Selector_Name (Expr1)) = N_Identifier)
678 then
679 if Nkind (Expr1) = N_Identifier
680 and then Chars (Expr1) = Name_System
681 then
682 Error_Msg_N
683 ("pragma Source_File_Name may not be used for System",
684 Arg1);
685 return Error;
686 end if;
687
688 -- Process index argument if present
689
690 if Arg_Count = 3 then
691 Expr := Expression (Arg3);
692
693 if Nkind (Expr) /= N_Integer_Literal
694 or else not UI_Is_In_Int_Range (Intval (Expr))
695 or else Intval (Expr) > 999
696 or else Intval (Expr) <= 0
697 then
698 Error_Msg
699 ("pragma% index must be integer literal" &
700 " in range 1 .. 999", Sloc (Expr));
701 raise Error_Resync;
702 else
703 Index := UI_To_Int (Intval (Expr));
704 end if;
705
706 -- No index argument present
707
708 else
709 Check_Arg_Count (2);
710 Index := 0;
711 end if;
712
713 Check_Optional_Identifier (Arg1, Name_Unit_Name);
714 Unam := Get_Unit_Name (Expr1);
715
716 Check_Arg_Is_String_Literal (Arg2);
717
718 if Chars (Arg2) = Name_Spec_File_Name then
719 Set_File_Name
720 (Get_Spec_Name (Unam), Get_Fname (Arg2), Index);
721
722 elsif Chars (Arg2) = Name_Body_File_Name then
723 Set_File_Name
724 (Unam, Get_Fname (Arg2), Index);
725
726 else
727 Error_Msg_N
728 ("pragma% argument has incorrect identifier", Arg2);
729 return Pragma_Node;
730 end if;
731
732 -- If the first argument is not an identifier, then we must have
733 -- the pattern form of the pragma, and the first argument must be
734 -- the pattern string with an appropriate name.
735
736 else
737 if Chars (Arg1) = Name_Spec_File_Name then
738 Typ := 's';
739
740 elsif Chars (Arg1) = Name_Body_File_Name then
741 Typ := 'b';
742
743 elsif Chars (Arg1) = Name_Subunit_File_Name then
744 Typ := 'u';
745
746 elsif Chars (Arg1) = Name_Unit_Name then
747 Error_Msg_N
748 ("Unit_Name parameter for pragma% must be an identifier",
749 Arg1);
750 raise Error_Resync;
751
752 else
753 Error_Msg_N
754 ("pragma% argument has incorrect identifier", Arg1);
755 raise Error_Resync;
756 end if;
757
758 Pat := Get_String_Argument (Arg1);
759
760 -- Check pattern has exactly one asterisk
761
762 Nast := 0;
763 for J in Pat'Range loop
764 if Pat (J) = '*' then
765 Nast := Nast + 1;
766 end if;
767 end loop;
768
769 if Nast /= 1 then
770 Error_Msg_N
771 ("file name pattern must have exactly one * character",
772 Arg1);
773 return Pragma_Node;
774 end if;
775
776 -- Set defaults for Casing and Dot_Separator parameters
777
778 Cas := All_Lower_Case;
779 Dot := new String'(".");
780
781 -- Process second and third arguments if present
782
783 if Arg_Count > 1 then
784 if Chars (Arg2) = Name_Casing then
785 Process_Casing (Arg2);
786
787 if Arg_Count = 3 then
788 Process_Dot_Replacement (Arg3);
789 end if;
790
791 else
792 Process_Dot_Replacement (Arg2);
793
794 if Arg_Count = 3 then
795 Process_Casing (Arg3);
796 end if;
797 end if;
798 end if;
799
800 Set_File_Name_Pattern (Pat, Typ, Dot, Cas);
801 end if;
802 end Source_File_Name;
803
804 -----------------------------
805 -- Source_Reference (GNAT) --
806 -----------------------------
807
808 -- pragma Source_Reference
809 -- (INTEGER_LITERAL [, STRING_LITERAL] );
810
811 -- Processing for this pragma must be done at parse time, since error
812 -- messages needing the proper line numbers can be generated in parse
813 -- only mode with semantic checking turned off, and indeed we usually
814 -- turn off semantic checking anyway if any parse errors are found.
815
816 when Pragma_Source_Reference => Source_Reference : declare
817 Fname : File_Name_Type;
818
819 begin
820 if Arg_Count /= 1 then
821 Check_Arg_Count (2);
822 Check_No_Identifier (Arg2);
823 end if;
824
825 -- Check that this is first line of file. We skip this test if
826 -- we are in syntax check only mode, since we may be dealing with
827 -- multiple compilation units.
828
829 if Get_Physical_Line_Number (Pragma_Sloc) /= 1
830 and then Num_SRef_Pragmas (Current_Source_File) = 0
831 and then Operating_Mode /= Check_Syntax
832 then
833 Error_Msg -- CODEFIX
834 ("first % pragma must be first line of file", Pragma_Sloc);
835 raise Error_Resync;
836 end if;
837
838 Check_No_Identifier (Arg1);
839
840 if Arg_Count = 1 then
841 if Num_SRef_Pragmas (Current_Source_File) = 0 then
842 Error_Msg
843 ("file name required for first % pragma in file",
844 Pragma_Sloc);
845 raise Error_Resync;
846 else
847 Fname := No_File;
848 end if;
849
850 -- File name present
851
852 else
853 Check_Arg_Is_String_Literal (Arg2);
854 String_To_Name_Buffer (Strval (Expression (Arg2)));
855 Fname := Name_Find;
856
857 if Num_SRef_Pragmas (Current_Source_File) > 0 then
858 if Fname /= Full_Ref_Name (Current_Source_File) then
859 Error_Msg
860 ("file name must be same in all % pragmas", Pragma_Sloc);
861 raise Error_Resync;
862 end if;
863 end if;
864 end if;
865
866 if Nkind (Expression (Arg1)) /= N_Integer_Literal then
867 Error_Msg
868 ("argument for pragma% must be integer literal",
869 Sloc (Expression (Arg1)));
870 raise Error_Resync;
871
872 -- OK, this source reference pragma is effective, however, we
873 -- ignore it if it is not in the first unit in the multiple unit
874 -- case. This is because the only purpose in this case is to
875 -- provide source pragmas for subsequent use by gnatchop.
876
877 else
878 if Num_Library_Units = 1 then
879 Register_Source_Ref_Pragma
880 (Fname,
881 Strip_Directory (Fname),
882 UI_To_Int (Intval (Expression (Arg1))),
883 Get_Physical_Line_Number (Pragma_Sloc) + 1);
884 end if;
885 end if;
886 end Source_Reference;
887
888 -------------------------
889 -- Style_Checks (GNAT) --
890 -------------------------
891
892 -- pragma Style_Checks (On | Off | ALL_CHECKS | STRING_LITERAL);
893
894 -- This is processed by the parser since some of the style
895 -- checks take place during source scanning and parsing.
896
897 when Pragma_Style_Checks => Style_Checks : declare
898 A : Node_Id;
899 S : String_Id;
900 C : Char_Code;
901 OK : Boolean := True;
902
903 begin
904 -- Two argument case is only for semantics
905
906 if Arg_Count = 2 then
907 null;
908
909 else
910 Check_Arg_Count (1);
911 Check_No_Identifier (Arg1);
912 A := Expression (Arg1);
913
914 if Nkind (A) = N_String_Literal then
915 S := Strval (A);
916
917 declare
918 Slen : constant Natural := Natural (String_Length (S));
919 Options : String (1 .. Slen);
920 J : Natural;
921 Ptr : Natural;
922
923 begin
924 J := 1;
925 loop
926 C := Get_String_Char (S, Int (J));
927
928 if not In_Character_Range (C) then
929 OK := False;
930 Ptr := J;
931 exit;
932
933 else
934 Options (J) := Get_Character (C);
935 end if;
936
937 if J = Slen then
938 Set_Style_Check_Options (Options, OK, Ptr);
939 exit;
940
941 else
942 J := J + 1;
943 end if;
944 end loop;
945
946 if not OK then
947 Error_Msg
948 (Style_Msg_Buf (1 .. Style_Msg_Len),
949 Sloc (Expression (Arg1)) + Source_Ptr (Ptr));
950 raise Error_Resync;
951 end if;
952 end;
953
954 elsif Nkind (A) /= N_Identifier then
955 OK := False;
956
957 elsif Chars (A) = Name_All_Checks then
958 if GNAT_Mode then
959 Stylesw.Set_GNAT_Style_Check_Options;
960 else
961 Stylesw.Set_Default_Style_Check_Options;
962 end if;
963
964 elsif Chars (A) = Name_On then
965 Style_Check := True;
966
967 elsif Chars (A) = Name_Off then
968 Style_Check := False;
969
970 else
971 OK := False;
972 end if;
973
974 if not OK then
975 Error_Msg ("incorrect argument for pragma%", Sloc (A));
976 raise Error_Resync;
977 end if;
978 end if;
979 end Style_Checks;
980
981 -------------------------
982 -- Suppress_All (GNAT) --
983 -------------------------
984
985 -- pragma Suppress_All
986
987 -- This is a rather odd pragma, because other compilers allow it in
988 -- strange places. DEC allows it at the end of units, and Rational
989 -- allows it as a program unit pragma, when it would be more natural
990 -- if it were a configuration pragma.
991
992 -- Since the reason we provide this pragma is for compatibility with
993 -- these other compilers, we want to accommodate these strange placement
994 -- rules, and the easiest thing is simply to allow it anywhere in a
995 -- unit. If this pragma appears anywhere within a unit, then the effect
996 -- is as though a pragma Suppress (All_Checks) had appeared as the first
997 -- line of the current file, i.e. as the first configuration pragma in
998 -- the current unit.
999
1000 -- To get this effect, we set the flag Has_Pragma_Suppress_All in the
1001 -- compilation unit node for the current source file then in the last
1002 -- stage of parsing a file, if this flag is set, we materialize the
1003 -- Suppress (All_Checks) pragma, marked as not coming from Source.
1004
1005 when Pragma_Suppress_All =>
1006 Set_Has_Pragma_Suppress_All (Cunit (Current_Source_Unit));
1007
1008 ---------------------
1009 -- Warnings (GNAT) --
1010 ---------------------
1011
1012 -- pragma Warnings (On | Off);
1013 -- pragma Warnings (On | Off, LOCAL_NAME);
1014 -- pragma Warnings (static_string_EXPRESSION);
1015 -- pragma Warnings (On | Off, static_string_EXPRESSION);
1016
1017 -- The one argument ON/OFF case is processed by the parser, since it may
1018 -- control parser warnings as well as semantic warnings, and in any case
1019 -- we want to be absolutely sure that the range in the warnings table is
1020 -- set well before any semantic analysis is performed. Note that we
1021 -- ignore this pragma if debug flag -gnatd.i is set.
1022
1023 when Pragma_Warnings =>
1024 if Arg_Count = 1 and then not Debug_Flag_Dot_I then
1025 Check_No_Identifier (Arg1);
1026
1027 declare
1028 Argx : constant Node_Id := Expression (Arg1);
1029 begin
1030 if Nkind (Argx) = N_Identifier then
1031 if Chars (Argx) = Name_On then
1032 Set_Warnings_Mode_On (Pragma_Sloc);
1033 elsif Chars (Argx) = Name_Off then
1034 Set_Warnings_Mode_Off (Pragma_Sloc);
1035 end if;
1036 end if;
1037 end;
1038 end if;
1039
1040 -----------------------------
1041 -- Wide_Character_Encoding --
1042 -----------------------------
1043
1044 -- pragma Wide_Character_Encoding (IDENTIFIER | CHARACTER_LITERAL);
1045
1046 -- This is processed by the parser, since the scanner is affected
1047
1048 when Pragma_Wide_Character_Encoding => Wide_Character_Encoding : declare
1049 A : Node_Id;
1050
1051 begin
1052 Check_Arg_Count (1);
1053 Check_No_Identifier (Arg1);
1054 A := Expression (Arg1);
1055
1056 if Nkind (A) = N_Identifier then
1057 Get_Name_String (Chars (A));
1058 Wide_Character_Encoding_Method :=
1059 Get_WC_Encoding_Method (Name_Buffer (1 .. Name_Len));
1060
1061 elsif Nkind (A) = N_Character_Literal then
1062 declare
1063 R : constant Char_Code :=
1064 Char_Code (UI_To_Int (Char_Literal_Value (A)));
1065 begin
1066 if In_Character_Range (R) then
1067 Wide_Character_Encoding_Method :=
1068 Get_WC_Encoding_Method (Get_Character (R));
1069 else
1070 raise Constraint_Error;
1071 end if;
1072 end;
1073
1074 else
1075 raise Constraint_Error;
1076 end if;
1077
1078 Upper_Half_Encoding :=
1079 Wide_Character_Encoding_Method in
1080 WC_Upper_Half_Encoding_Method;
1081
1082 exception
1083 when Constraint_Error =>
1084 Error_Msg_N ("invalid argument for pragma%", Arg1);
1085 end Wide_Character_Encoding;
1086
1087 -----------------------
1088 -- All Other Pragmas --
1089 -----------------------
1090
1091 -- For all other pragmas, checking and processing is handled
1092 -- entirely in Sem_Prag, and no further checking is done by Par.
1093
1094 when Pragma_Abort_Defer |
1095 Pragma_Assertion_Policy |
1096 Pragma_Assume_No_Invalid_Values |
1097 Pragma_AST_Entry |
1098 Pragma_All_Calls_Remote |
1099 Pragma_Annotate |
1100 Pragma_Assert |
1101 Pragma_Asynchronous |
1102 Pragma_Atomic |
1103 Pragma_Atomic_Components |
1104 Pragma_Attach_Handler |
1105 Pragma_Check |
1106 Pragma_Check_Name |
1107 Pragma_Check_Policy |
1108 Pragma_CIL_Constructor |
1109 Pragma_Compile_Time_Error |
1110 Pragma_Compile_Time_Warning |
1111 Pragma_Compiler_Unit |
1112 Pragma_Contract_Case |
1113 Pragma_Convention_Identifier |
1114 Pragma_CPP_Class |
1115 Pragma_CPP_Constructor |
1116 Pragma_CPP_Virtual |
1117 Pragma_CPP_Vtable |
1118 Pragma_CPU |
1119 Pragma_C_Pass_By_Copy |
1120 Pragma_Comment |
1121 Pragma_Common_Object |
1122 Pragma_Complete_Representation |
1123 Pragma_Complex_Representation |
1124 Pragma_Component_Alignment |
1125 Pragma_Controlled |
1126 Pragma_Convention |
1127 Pragma_Debug_Policy |
1128 Pragma_Detect_Blocking |
1129 Pragma_Default_Storage_Pool |
1130 Pragma_Disable_Atomic_Synchronization |
1131 Pragma_Discard_Names |
1132 Pragma_Dispatching_Domain |
1133 Pragma_Eliminate |
1134 Pragma_Elaborate |
1135 Pragma_Elaborate_All |
1136 Pragma_Elaborate_Body |
1137 Pragma_Elaboration_Checks |
1138 Pragma_Enable_Atomic_Synchronization |
1139 Pragma_Export |
1140 Pragma_Export_Exception |
1141 Pragma_Export_Function |
1142 Pragma_Export_Object |
1143 Pragma_Export_Procedure |
1144 Pragma_Export_Value |
1145 Pragma_Export_Valued_Procedure |
1146 Pragma_Extend_System |
1147 Pragma_External |
1148 Pragma_External_Name_Casing |
1149 Pragma_Favor_Top_Level |
1150 Pragma_Fast_Math |
1151 Pragma_Finalize_Storage_Only |
1152 Pragma_Float_Representation |
1153 Pragma_Ident |
1154 Pragma_Implementation_Defined |
1155 Pragma_Implemented |
1156 Pragma_Implicit_Packing |
1157 Pragma_Import |
1158 Pragma_Import_Exception |
1159 Pragma_Import_Function |
1160 Pragma_Import_Object |
1161 Pragma_Import_Procedure |
1162 Pragma_Import_Valued_Procedure |
1163 Pragma_Independent |
1164 Pragma_Independent_Components |
1165 Pragma_Initialize_Scalars |
1166 Pragma_Inline |
1167 Pragma_Inline_Always |
1168 Pragma_Inline_Generic |
1169 Pragma_Inspection_Point |
1170 Pragma_Interface |
1171 Pragma_Interface_Name |
1172 Pragma_Interrupt_Handler |
1173 Pragma_Interrupt_State |
1174 Pragma_Interrupt_Priority |
1175 Pragma_Invariant |
1176 Pragma_Java_Constructor |
1177 Pragma_Java_Interface |
1178 Pragma_Keep_Names |
1179 Pragma_License |
1180 Pragma_Link_With |
1181 Pragma_Linker_Alias |
1182 Pragma_Linker_Constructor |
1183 Pragma_Linker_Destructor |
1184 Pragma_Linker_Options |
1185 Pragma_Linker_Section |
1186 Pragma_Lock_Free |
1187 Pragma_Locking_Policy |
1188 Pragma_Long_Float |
1189 Pragma_Machine_Attribute |
1190 Pragma_Main |
1191 Pragma_Main_Storage |
1192 Pragma_Memory_Size |
1193 Pragma_No_Body |
1194 Pragma_No_Return |
1195 Pragma_No_Run_Time |
1196 Pragma_No_Strict_Aliasing |
1197 Pragma_Normalize_Scalars |
1198 Pragma_Obsolescent |
1199 Pragma_Ordered |
1200 Pragma_Optimize |
1201 Pragma_Optimize_Alignment |
1202 Pragma_Pack |
1203 Pragma_Passive |
1204 Pragma_Preelaborable_Initialization |
1205 Pragma_Polling |
1206 Pragma_Persistent_BSS |
1207 Pragma_Postcondition |
1208 Pragma_Precondition |
1209 Pragma_Predicate |
1210 Pragma_Preelaborate |
1211 Pragma_Preelaborate_05 |
1212 Pragma_Priority |
1213 Pragma_Priority_Specific_Dispatching |
1214 Pragma_Profile |
1215 Pragma_Profile_Warnings |
1216 Pragma_Propagate_Exceptions |
1217 Pragma_Psect_Object |
1218 Pragma_Pure |
1219 Pragma_Pure_05 |
1220 Pragma_Pure_12 |
1221 Pragma_Pure_Function |
1222 Pragma_Queuing_Policy |
1223 Pragma_Relative_Deadline |
1224 Pragma_Remote_Access_Type |
1225 Pragma_Remote_Call_Interface |
1226 Pragma_Remote_Types |
1227 Pragma_Restricted_Run_Time |
1228 Pragma_Ravenscar |
1229 Pragma_Reviewable |
1230 Pragma_Share_Generic |
1231 Pragma_Shared |
1232 Pragma_Shared_Passive |
1233 Pragma_Short_Circuit_And_Or |
1234 Pragma_Short_Descriptors |
1235 Pragma_Simple_Storage_Pool_Type |
1236 Pragma_Storage_Size |
1237 Pragma_Storage_Unit |
1238 Pragma_Static_Elaboration_Desired |
1239 Pragma_Stream_Convert |
1240 Pragma_Subtitle |
1241 Pragma_Suppress |
1242 Pragma_Suppress_Debug_Info |
1243 Pragma_Suppress_Exception_Locations |
1244 Pragma_Suppress_Initialization |
1245 Pragma_System_Name |
1246 Pragma_Task_Dispatching_Policy |
1247 Pragma_Task_Info |
1248 Pragma_Task_Name |
1249 Pragma_Task_Storage |
1250 Pragma_Test_Case |
1251 Pragma_Thread_Local_Storage |
1252 Pragma_Time_Slice |
1253 Pragma_Title |
1254 Pragma_Unchecked_Union |
1255 Pragma_Unimplemented_Unit |
1256 Pragma_Universal_Aliasing |
1257 Pragma_Universal_Data |
1258 Pragma_Unmodified |
1259 Pragma_Unreferenced |
1260 Pragma_Unreferenced_Objects |
1261 Pragma_Unreserve_All_Interrupts |
1262 Pragma_Unsuppress |
1263 Pragma_Use_VADS_Size |
1264 Pragma_Volatile |
1265 Pragma_Volatile_Components |
1266 Pragma_Weak_External |
1267 Pragma_Validity_Checks =>
1268 null;
1269
1270 --------------------
1271 -- Unknown_Pragma --
1272 --------------------
1273
1274 -- Should be impossible, since we excluded this case earlier on
1275
1276 when Unknown_Pragma =>
1277 raise Program_Error;
1278
1279 end case;
1280
1281 return Pragma_Node;
1282
1283 --------------------
1284 -- Error Handling --
1285 --------------------
1286
1287 exception
1288 when Error_Resync =>
1289 return Error;
1290
1291 end Prag;
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