1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2008, Free Software Foundation, Inc. --
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. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 pragma Style_Checks (All_Checks);
27 -- Turn off subprogram body ordering check. Subprograms are in order
28 -- by RM section rather than alphabetical
30 with Fname.UF; use Fname.UF;
31 with Uname; use Uname;
36 -- Local functions, used only in this chapter
38 function P_Context_Clause return List_Id;
39 function P_Subunit return Node_Id;
41 function Set_Location return Source_Ptr;
42 -- The current compilation unit starts with Token at Token_Ptr. This
43 -- function determines the corresponding source location for the start
44 -- of the unit, including any preceding comment lines.
46 procedure Unit_Display
49 SR_Present : Boolean);
50 -- This procedure is used to generate a line of output for a unit in
51 -- the source program. Cunit is the node for the compilation unit, and
52 -- Loc is the source location for the start of the unit in the source
53 -- file (which is not necessarily the Sloc of the Cunit node). This
54 -- output is written to the standard output file for use by gnatchop.
56 procedure Unit_Location (Sind : Source_File_Index; Loc : Source_Ptr);
57 -- This routine has the same calling sequence as Unit_Display, but
58 -- it outputs only the line number and offset of the location, Loc,
59 -- using Cunit to obtain the proper source file index.
61 -------------------------
62 -- 10.1.1 Compilation --
63 -------------------------
65 -- COMPILATION ::= {COMPILATION_UNIT}
67 -- There is no specific parsing routine for a compilation, since we only
68 -- permit a single compilation in a source file, so there is no explicit
69 -- occurrence of compilations as such (our representation of a compilation
70 -- is a series of separate source files).
72 ------------------------------
73 -- 10.1.1 Compilation unit --
74 ------------------------------
76 -- COMPILATION_UNIT ::=
77 -- CONTEXT_CLAUSE LIBRARY_ITEM
78 -- | CONTEXT_CLAUSE SUBUNIT
81 -- private LIBRARY_UNIT_DECLARATION
82 -- | LIBRARY_UNIT_BODY
83 -- | [private] LIBRARY_UNIT_RENAMING_DECLARATION
85 -- LIBRARY_UNIT_DECLARATION ::=
86 -- SUBPROGRAM_DECLARATION | PACKAGE_DECLARATION
87 -- | GENERIC_DECLARATION | GENERIC_INSTANTIATION
89 -- LIBRARY_UNIT_RENAMING_DECLARATION ::=
90 -- PACKAGE_RENAMING_DECLARATION
91 -- | GENERIC_RENAMING_DECLARATION
92 -- | SUBPROGRAM_RENAMING_DECLARATION
94 -- LIBRARY_UNIT_BODY ::= SUBPROGRAM_BODY | PACKAGE_BODY
96 -- Error recovery: cannot raise Error_Resync. If an error occurs, tokens
97 -- are skipped up to the next possible beginning of a compilation unit.
99 -- Note: if only configuration pragmas are found, Empty is returned
101 -- Note: in syntax-only mode, it is possible for P_Compilation_Unit
102 -- to return strange things that are not really compilation units.
103 -- This is done to help out gnatchop when it is faced with nonsense.
105 function P_Compilation_Unit return Node_Id is
106 Scan_State : Saved_Scan_State;
108 Specification_Node : Node_Id;
110 Comp_Unit_Node : Node_Id;
113 Private_Sloc : Source_Ptr := No_Location;
114 Config_Pragmas : List_Id;
116 SR_Present : Boolean;
118 Cunit_Error_Flag : Boolean := False;
119 -- This flag is set True if we have to scan for a compilation unit
120 -- token. It is used to ensure clean termination in such cases by
121 -- not insisting on being at the end of file, and, in the syntax only
122 -- case by not scanning for additional compilation units.
124 Cunit_Location : Source_Ptr;
125 -- Location of unit for unit identification output (List_Unit option)
128 Num_Library_Units := Num_Library_Units + 1;
130 -- Set location of the compilation unit if unit list option set
131 -- and we are in syntax check only mode
133 if List_Units and then Operating_Mode = Check_Syntax then
134 Cunit_Location := Set_Location;
136 Cunit_Location := No_Location;
139 -- Deal with initial pragmas
141 Config_Pragmas := No_List;
143 -- If we have an initial Source_Reference pragma, then remember
144 -- the fact to generate an NR parameter in the output line.
148 if Token = Tok_Pragma then
149 Save_Scan_State (Scan_State);
153 or else Pragma_Name (Item) /= Name_Source_Reference
155 Restore_Scan_State (Scan_State);
160 -- If first unit, record the file name for gnatchop use
162 if Operating_Mode = Check_Syntax
164 and then Num_Library_Units = 1
166 Write_Str ("Source_Reference pragma for file """);
167 Write_Name (Full_Ref_Name (Current_Source_File));
172 Config_Pragmas := New_List (Item);
176 -- Scan out any configuration pragmas
178 while Token = Tok_Pragma loop
179 Save_Scan_State (Scan_State);
184 Is_Configuration_Pragma_Name (Pragma_Name (Item))
186 Restore_Scan_State (Scan_State);
190 if Config_Pragmas = No_List then
191 Config_Pragmas := Empty_List;
193 if Operating_Mode = Check_Syntax and then List_Units then
194 Write_Str ("Configuration pragmas at");
195 Unit_Location (Current_Source_File, Cunit_Location);
200 Append (Item, Config_Pragmas);
201 Cunit_Location := Set_Location;
204 -- Establish compilation unit node and scan context items
206 Comp_Unit_Node := New_Node (N_Compilation_Unit, No_Location);
207 Set_Cunit (Current_Source_Unit, Comp_Unit_Node);
208 Set_Context_Items (Comp_Unit_Node, P_Context_Clause);
210 (Comp_Unit_Node, New_Node (N_Compilation_Unit_Aux, No_Location));
212 if Present (Config_Pragmas) then
214 -- Check for case of only configuration pragmas present
217 and then Is_Empty_List (Context_Items (Comp_Unit_Node))
219 if Operating_Mode = Check_Syntax then
223 Item := First (Config_Pragmas);
225 ("cannot compile configuration pragmas with gcc!", Item);
227 ("\use gnatchop -c to process configuration pragmas!", Item);
228 raise Unrecoverable_Error;
231 -- Otherwise configuration pragmas are simply prepended to the
232 -- context of the current unit.
235 Append_List (Context_Items (Comp_Unit_Node), Config_Pragmas);
236 Set_Context_Items (Comp_Unit_Node, Config_Pragmas);
240 -- Check for PRIVATE. Note that for the moment we allow this in
241 -- Ada_83 mode, since we do not yet know if we are compiling a
242 -- predefined unit, and if we are then it would be allowed anyway.
244 if Token = Tok_Private then
245 Private_Sloc := Token_Ptr;
246 Set_Keyword_Casing (Current_Source_File, Determine_Token_Casing);
248 Style.Check_Indentation;
251 Save_Scan_State (Scan_State); -- at PRIVATE
252 Scan; -- past PRIVATE
254 if Token = Tok_Separate then
255 Error_Msg_SP ("cannot have private subunits!");
257 elsif Token = Tok_Package then
258 Scan; -- past PACKAGE
260 if Token = Tok_Body then
261 Restore_Scan_State (Scan_State); -- to PRIVATE
262 Error_Msg_SC ("cannot have private package body!");
263 Scan; -- ignore PRIVATE
266 Restore_Scan_State (Scan_State); -- to PRIVATE
267 Scan; -- past PRIVATE
268 Set_Private_Present (Comp_Unit_Node, True);
271 elsif Token = Tok_Procedure
272 or else Token = Tok_Function
273 or else Token = Tok_Generic
275 Set_Private_Present (Comp_Unit_Node, True);
279 -- Loop to find our way to a compilation unit token
282 exit when Token in Token_Class_Cunit and then Token /= Tok_With;
284 exit when Bad_Spelling_Of (Tok_Package)
285 or else Bad_Spelling_Of (Tok_Function)
286 or else Bad_Spelling_Of (Tok_Generic)
287 or else Bad_Spelling_Of (Tok_Separate)
288 or else Bad_Spelling_Of (Tok_Procedure);
290 -- Allow task and protected for nice error recovery purposes
292 exit when Token = Tok_Task
293 or else Token = Tok_Protected;
295 if Token = Tok_With then
296 Error_Msg_SC ("misplaced WITH");
297 Append_List (P_Context_Clause, Context_Items (Comp_Unit_Node));
299 elsif Bad_Spelling_Of (Tok_With) then
300 Append_List (P_Context_Clause, Context_Items (Comp_Unit_Node));
303 if Operating_Mode = Check_Syntax and then Token = Tok_EOF then
304 Error_Msg_SC ("?file contains no compilation units");
306 Error_Msg_SC ("compilation unit expected");
307 Cunit_Error_Flag := True;
311 -- If we are at an end of file, then just quit, the above error
312 -- message was complaint enough.
314 if Token = Tok_EOF then
320 -- We have a compilation unit token, so that's a reasonable choice for
321 -- determining the standard casing convention used for keywords in case
322 -- it hasn't already been done on seeing a WITH or PRIVATE.
324 Set_Keyword_Casing (Current_Source_File, Determine_Token_Casing);
326 Style.Check_Indentation;
329 -- Remaining processing depends on particular type of compilation unit
331 if Token = Tok_Package then
333 -- A common error is to omit the body keyword after package. We can
334 -- often diagnose this early on (before getting loads of errors from
335 -- contained subprogram bodies), by knowing that that the file we
336 -- are compiling has a name that requires a body to be found.
338 Save_Scan_State (Scan_State);
339 Scan; -- past Package keyword
343 Get_Expected_Unit_Type
344 (File_Name (Current_Source_File)) = Expect_Body
346 Error_Msg_BC ("keyword BODY expected here [see file name]");
347 Restore_Scan_State (Scan_State);
348 Set_Unit (Comp_Unit_Node, P_Package (Pf_Pbod));
350 Restore_Scan_State (Scan_State);
351 Set_Unit (Comp_Unit_Node, P_Package (Pf_Decl_Gins_Pbod_Rnam));
354 elsif Token = Tok_Generic then
355 Set_Unit (Comp_Unit_Node, P_Generic);
357 elsif Token = Tok_Separate then
358 Set_Unit (Comp_Unit_Node, P_Subunit);
360 elsif Token = Tok_Function
361 or else Token = Tok_Not
362 or else Token = Tok_Overriding
363 or else Token = Tok_Procedure
365 Set_Unit (Comp_Unit_Node, P_Subprogram (Pf_Decl_Gins_Pbod_Rnam));
367 -- A little bit of an error recovery check here. If we just scanned
368 -- a subprogram declaration (as indicated by an SIS entry being
369 -- active), then if the following token is BEGIN or an identifier,
370 -- or a token which can reasonably start a declaration but cannot
371 -- start a compilation unit, then we assume that the semicolon in
372 -- the declaration should have been IS.
374 if SIS_Entry_Active then
377 or else Token = Tok_Identifier
378 or else Token in Token_Class_Deckn
381 Scope.Table (Scope.Last).Etyp := E_Name;
382 Scope.Table (Scope.Last).Sloc := SIS_Sloc;
383 Scope.Table (Scope.Last).Ecol := SIS_Ecol;
384 Scope.Table (Scope.Last).Lreq := False;
385 SIS_Entry_Active := False;
387 -- If we had a missing semicolon in the declaration, then
388 -- change the message to from <missing ";"> to <missing "is">
390 if SIS_Missing_Semicolon_Message /= No_Error_Msg then
391 Change_Error_Text -- Replace: "missing "";"" "
392 (SIS_Missing_Semicolon_Message, "missing IS");
394 -- Otherwise we saved the semicolon position, so complain
397 Error_Msg (""";"" should be IS", SIS_Semicolon_Sloc);
400 Body_Node := Unit (Comp_Unit_Node);
401 Specification_Node := Specification (Body_Node);
402 Change_Node (Body_Node, N_Subprogram_Body);
403 Set_Specification (Body_Node, Specification_Node);
404 Parse_Decls_Begin_End (Body_Node);
405 Set_Unit (Comp_Unit_Node, Body_Node);
408 -- If we scanned a subprogram body, make sure we did not have private
410 elsif Private_Sloc /= No_Location
412 Nkind (Unit (Comp_Unit_Node)) not in N_Subprogram_Instantiation
414 Nkind (Unit (Comp_Unit_Node)) /= N_Subprogram_Renaming_Declaration
416 Error_Msg ("cannot have private subprogram body", Private_Sloc);
418 -- P_Subprogram can yield an abstract subprogram, but this cannot
419 -- be a compilation unit. Treat as a subprogram declaration.
422 Nkind (Unit (Comp_Unit_Node)) = N_Abstract_Subprogram_Declaration
425 ("compilation unit cannot be abstract subprogram",
426 Unit (Comp_Unit_Node));
429 New_Node (N_Subprogram_Declaration, Sloc (Comp_Unit_Node));
430 Set_Specification (Unit_Node,
431 Specification (Unit (Comp_Unit_Node)));
432 Set_Unit (Comp_Unit_Node, Unit_Node);
435 -- Otherwise we have TASK. This is not really an acceptable token,
436 -- but we accept it to improve error recovery.
438 elsif Token = Tok_Task then
441 if Token = Tok_Type then
443 ("task type cannot be used as compilation unit");
446 ("task declaration cannot be used as compilation unit");
449 -- If in check syntax mode, accept the task anyway. This is done
450 -- particularly to improve the behavior of GNATCHOP in this case.
452 if Operating_Mode = Check_Syntax then
453 Set_Unit (Comp_Unit_Node, P_Task);
455 -- If not in syntax only mode, treat this as horrible error
458 Cunit_Error_Flag := True;
462 else pragma Assert (Token = Tok_Protected);
463 Scan; -- Past PROTECTED
465 if Token = Tok_Type then
467 ("protected type cannot be used as compilation unit");
470 ("protected declaration cannot be used as compilation unit");
473 -- If in check syntax mode, accept protected anyway. This is done
474 -- particularly to improve the behavior of GNATCHOP in this case.
476 if Operating_Mode = Check_Syntax then
477 Set_Unit (Comp_Unit_Node, P_Protected);
479 -- If not in syntax only mode, treat this as horrible error
482 Cunit_Error_Flag := True;
487 -- Here is where locate the compilation unit entity. This is a little
488 -- tricky, since it is buried in various places.
490 Unit_Node := Unit (Comp_Unit_Node);
492 -- Another error from which it is hard to recover
494 if Nkind (Unit_Node) = N_Subprogram_Body_Stub
495 or else Nkind (Unit_Node) = N_Package_Body_Stub
497 Cunit_Error_Flag := True;
501 -- Only try this if we got an OK unit!
503 if Unit_Node /= Error then
504 if Nkind (Unit_Node) = N_Subunit then
505 Unit_Node := Proper_Body (Unit_Node);
508 if Nkind (Unit_Node) in N_Generic_Declaration then
509 Unit_Node := Specification (Unit_Node);
512 if Nkind (Unit_Node) = N_Package_Declaration
513 or else Nkind (Unit_Node) = N_Subprogram_Declaration
514 or else Nkind (Unit_Node) = N_Subprogram_Body
515 or else Nkind (Unit_Node) = N_Subprogram_Renaming_Declaration
517 Unit_Node := Specification (Unit_Node);
519 elsif Nkind (Unit_Node) = N_Subprogram_Renaming_Declaration then
520 if Ada_Version = Ada_83 then
522 ("(Ada 83) library unit renaming not allowed", Unit_Node);
526 if Nkind (Unit_Node) = N_Task_Body
527 or else Nkind (Unit_Node) = N_Protected_Body
528 or else Nkind (Unit_Node) = N_Task_Type_Declaration
529 or else Nkind (Unit_Node) = N_Protected_Type_Declaration
530 or else Nkind (Unit_Node) = N_Single_Task_Declaration
531 or else Nkind (Unit_Node) = N_Single_Protected_Declaration
533 Name_Node := Defining_Identifier (Unit_Node);
535 elsif Nkind (Unit_Node) = N_Function_Instantiation
536 or else Nkind (Unit_Node) = N_Function_Specification
537 or else Nkind (Unit_Node) = N_Generic_Function_Renaming_Declaration
538 or else Nkind (Unit_Node) = N_Generic_Package_Renaming_Declaration
539 or else Nkind (Unit_Node) = N_Generic_Procedure_Renaming_Declaration
540 or else Nkind (Unit_Node) = N_Package_Body
541 or else Nkind (Unit_Node) = N_Package_Instantiation
542 or else Nkind (Unit_Node) = N_Package_Renaming_Declaration
543 or else Nkind (Unit_Node) = N_Package_Specification
544 or else Nkind (Unit_Node) = N_Procedure_Instantiation
545 or else Nkind (Unit_Node) = N_Procedure_Specification
547 Name_Node := Defining_Unit_Name (Unit_Node);
549 -- Anything else is a serious error, abandon scan
555 Set_Sloc (Comp_Unit_Node, Sloc (Name_Node));
556 Set_Sloc (Aux_Decls_Node (Comp_Unit_Node), Sloc (Name_Node));
558 -- Set Entity field in file table. Easier now that we have name!
559 -- Note that this is also skipped if we had a bad unit
561 if Nkind (Name_Node) = N_Defining_Program_Unit_Name then
563 (Current_Source_Unit, Defining_Identifier (Name_Node));
565 Set_Cunit_Entity (Current_Source_Unit, Name_Node);
569 (Current_Source_Unit, Get_Unit_Name (Unit (Comp_Unit_Node)));
571 -- If we had a bad unit, make sure the fatal flag is set in the file
572 -- table entry, since this is surely a fatal error and also set our
573 -- flag to inhibit the requirement that we be at end of file.
576 Cunit_Error_Flag := True;
577 Set_Fatal_Error (Current_Source_Unit);
580 -- Clear away any missing semicolon indication, we are done with that
581 -- unit, so what's done is done, and we don't want anything hanging
582 -- around from the attempt to parse it!
584 SIS_Entry_Active := False;
586 -- Scan out pragmas after unit
588 while Token = Tok_Pragma loop
589 Save_Scan_State (Scan_State);
591 -- If we are in syntax scan mode allowing multiple units, then start
592 -- the next unit if we encounter a configuration pragma, or a source
593 -- reference pragma. We take care not to actually scan the pragma in
594 -- this case (we don't want it to take effect for the current unit).
596 if Operating_Mode = Check_Syntax then
599 if Token = Tok_Identifier
601 (Is_Configuration_Pragma_Name (Token_Name)
602 or else Token_Name = Name_Source_Reference)
604 Restore_Scan_State (Scan_State); -- to Pragma
609 -- Otherwise eat the pragma, it definitely belongs with the
610 -- current unit, and not with the following unit.
612 Restore_Scan_State (Scan_State); -- to Pragma
615 if No (Pragmas_After (Aux_Decls_Node (Comp_Unit_Node))) then
617 (Aux_Decls_Node (Comp_Unit_Node), New_List);
620 Append (P, Pragmas_After (Aux_Decls_Node (Comp_Unit_Node)));
623 -- Cancel effect of any outstanding pragma Warnings (Off)
625 Set_Warnings_Mode_On (Scan_Ptr);
627 -- Ada 83 error checks
629 if Ada_Version = Ada_83 then
631 -- Check we did not with any child units
633 Item := First (Context_Items (Comp_Unit_Node));
635 while Present (Item) loop
636 if Nkind (Item) = N_With_Clause
637 and then Nkind (Name (Item)) /= N_Identifier
639 Error_Msg_N ("(Ada 83) child units not allowed", Item);
645 -- Check that we did not have a PRIVATE keyword present
647 if Private_Present (Comp_Unit_Node) then
649 ("(Ada 83) private units not allowed", Private_Sloc);
653 -- If no serious error, then output possible unit information line
654 -- for gnatchop if we are in syntax only, list units mode.
656 if not Cunit_Error_Flag
658 and then Operating_Mode = Check_Syntax
660 Unit_Display (Comp_Unit_Node, Cunit_Location, SR_Present);
663 -- And now we should be at the end of file
665 if Token /= Tok_EOF then
667 -- If we already had to scan for a compilation unit, then don't
668 -- give any further error message, since it just seems to make
669 -- things worse, and we already gave a serious error message.
671 if Cunit_Error_Flag then
674 -- If we are in check syntax mode, then we allow multiple units
675 -- so we just return with Token not set to Tok_EOF and no message.
677 elsif Operating_Mode = Check_Syntax then
678 return Comp_Unit_Node;
680 -- We also allow multiple units if we are in multiple unit mode
682 elsif Multiple_Unit_Index /= 0 then
684 -- Skip tokens to end of file, so that the -gnatl listing
685 -- will be complete in this situation, but no need to parse
686 -- the remaining units; no style checking either.
689 Save_Style_Check : constant Boolean := Style_Check;
692 Style_Check := False;
694 while Token /= Tok_EOF loop
698 Style_Check := Save_Style_Check;
701 return Comp_Unit_Node;
703 -- Otherwise we have an error. We suppress the error message
704 -- if we already had a fatal error, since this stops junk
705 -- cascaded messages in some situations.
708 if not Fatal_Error (Current_Source_Unit) then
709 if Token in Token_Class_Cunit then
711 ("end of file expected, " &
712 "file can have only one compilation unit");
714 Error_Msg_SC ("end of file expected");
719 -- Skip tokens to end of file, so that the -gnatl listing
720 -- will be complete in this situation, but no error checking
721 -- other than that provided at the token level.
723 while Token /= Tok_EOF loop
729 -- Normal return (we were at the end of file as expected)
732 return Comp_Unit_Node;
737 -- An error resync is a serious bomb, so indicate result unit no good
740 Set_Fatal_Error (Current_Source_Unit);
742 end P_Compilation_Unit;
744 --------------------------
745 -- 10.1.1 Library Item --
746 --------------------------
748 -- Parsed by P_Compilation_Unit (10.1.1)
750 --------------------------------------
751 -- 10.1.1 Library Unit Declaration --
752 --------------------------------------
754 -- Parsed by P_Compilation_Unit (10.1.1)
756 ------------------------------------------------
757 -- 10.1.1 Library Unit Renaming Declaration --
758 ------------------------------------------------
760 -- Parsed by P_Compilation_Unit (10.1.1)
762 -------------------------------
763 -- 10.1.1 Library Unit Body --
764 -------------------------------
766 -- Parsed by P_Compilation_Unit (10.1.1)
768 ------------------------------
769 -- 10.1.1 Parent Unit Name --
770 ------------------------------
772 -- Parsed (as a name) by its parent construct
774 ----------------------------
775 -- 10.1.2 Context Clause --
776 ----------------------------
778 -- CONTEXT_CLAUSE ::= {CONTEXT_ITEM}
780 -- CONTEXT_ITEM ::= WITH_CLAUSE | USE_CLAUSE | WITH_TYPE_CLAUSE
783 -- [LIMITED] [PRIVATE] with library_unit_NAME {,library_unit_NAME};
784 -- Note: the two qualifiers are Ada 2005 extensions.
786 -- WITH_TYPE_CLAUSE ::=
787 -- with type type_NAME is access; | with type type_NAME is tagged;
788 -- Note: this form is obsolete (old GNAT extension).
790 -- Error recovery: Cannot raise Error_Resync
792 function P_Context_Clause return List_Id is
794 Has_Limited : Boolean := False;
795 Has_Private : Boolean := False;
796 Scan_State : Saved_Scan_State;
798 First_Flag : Boolean;
801 Item_List := New_List;
803 -- Get keyword casing from WITH keyword in case not set yet
805 if Token = Tok_With then
806 Set_Keyword_Casing (Current_Source_File, Determine_Token_Casing);
809 -- Loop through context items
813 Style.Check_Indentation;
816 -- Gather any pragmas appearing in the context clause
818 P_Pragmas_Opt (Item_List);
820 -- Processing for WITH clause
822 -- Ada 2005 (AI-50217, AI-262): First check for LIMITED WITH,
823 -- PRIVATE WITH, or both.
825 if Token = Tok_Limited then
827 Has_Private := False;
828 Scan; -- past LIMITED
830 -- In the context, LIMITED can only appear in a with_clause
832 if Token = Tok_Private then
834 Scan; -- past PRIVATE
837 if Token /= Tok_With then
838 Error_Msg_SC ("unexpected LIMITED ignored");
841 if Ada_Version < Ada_05 then
842 Error_Msg_SP ("LIMITED WITH is an Ada 2005 extension");
844 ("\unit must be compiled with -gnat05 switch");
847 elsif Token = Tok_Private then
848 Has_Limited := False;
850 Save_Scan_State (Scan_State);
851 Scan; -- past PRIVATE
853 if Token /= Tok_With then
855 -- Keyword is beginning of private child unit
857 Restore_Scan_State (Scan_State); -- to PRIVATE
860 elsif Ada_Version < Ada_05 then
861 Error_Msg_SP ("`PRIVATE WITH` is an Ada 2005 extension");
863 ("\unit must be compiled with -gnat05 switch");
867 Has_Limited := False;
868 Has_Private := False;
871 if Token = Tok_With then
874 if Token = Tok_Type then
876 -- WITH TYPE is an obsolete GNAT specific extension
879 ("`WITH TYPE` is an obsolete 'G'N'A'T extension");
880 Error_Msg_SP ("\use Ada 2005 `LIMITED WITH` clause instead");
886 if Token = Tok_Tagged then
889 elsif Token = Tok_Access then
893 Error_Msg_SC ("expect tagged or access qualifier");
901 -- Loop through names in one with clause, generating a separate
902 -- N_With_Clause node for each name encountered.
905 With_Node := New_Node (N_With_Clause, Token_Ptr);
906 Append (With_Node, Item_List);
908 -- Note that we allow with'ing of child units, even in
909 -- Ada 83 mode, since presumably if this is not desired,
910 -- then the compilation of the child unit itself is the
911 -- place where such an "error" should be caught.
913 Set_Name (With_Node, P_Qualified_Simple_Name);
914 Set_First_Name (With_Node, First_Flag);
915 Set_Limited_Present (With_Node, Has_Limited);
916 Set_Private_Present (With_Node, Has_Private);
919 -- All done if no comma
921 exit when Token /= Tok_Comma;
923 -- If comma is followed by compilation unit token
924 -- or by USE, or PRAGMA, then it should have been a
925 -- semicolon after all
927 Save_Scan_State (Scan_State);
930 if Token in Token_Class_Cunit
931 or else Token = Tok_Use
932 or else Token = Tok_Pragma
934 Restore_Scan_State (Scan_State);
939 Set_Last_Name (With_Node, True);
943 -- Processing for USE clause
945 elsif Token = Tok_Use then
946 Append (P_Use_Clause, Item_List);
948 -- Anything else is end of context clause
956 end P_Context_Clause;
958 --------------------------
959 -- 10.1.2 Context Item --
960 --------------------------
962 -- Parsed by P_Context_Clause (10.1.2)
964 -------------------------
965 -- 10.1.2 With Clause --
966 -------------------------
968 -- Parsed by P_Context_Clause (10.1.2)
970 -----------------------
971 -- 10.1.3 Body Stub --
972 -----------------------
974 -- Subprogram stub parsed by P_Subprogram (6.1)
975 -- Package stub parsed by P_Package (7.1)
976 -- Task stub parsed by P_Task (9.1)
977 -- Protected stub parsed by P_Protected (9.4)
979 ----------------------------------
980 -- 10.1.3 Subprogram Body Stub --
981 ----------------------------------
983 -- Parsed by P_Subprogram (6.1)
985 -------------------------------
986 -- 10.1.3 Package Body Stub --
987 -------------------------------
989 -- Parsed by P_Package (7.1)
991 ----------------------------
992 -- 10.1.3 Task Body Stub --
993 ----------------------------
995 -- Parsed by P_Task (9.1)
997 ---------------------------------
998 -- 10.1.3 Protected Body Stub --
999 ---------------------------------
1001 -- Parsed by P_Protected (9.4)
1003 ---------------------
1004 -- 10.1.3 Subunit --
1005 ---------------------
1007 -- SUBUNIT ::= separate (PARENT_UNIT_NAME) PROPER_BODY
1009 -- PARENT_UNIT_NAME ::= NAME
1011 -- The caller has checked that the initial token is SEPARATE
1013 -- Error recovery: cannot raise Error_Resync
1015 function P_Subunit return Node_Id is
1016 Subunit_Node : Node_Id;
1017 Body_Node : Node_Id;
1020 Subunit_Node := New_Node (N_Subunit, Token_Ptr);
1021 Body_Node := Error; -- in case no good body found
1022 Scan; -- past SEPARATE;
1025 Set_Name (Subunit_Node, P_Qualified_Simple_Name);
1028 Ignore (Tok_Semicolon);
1030 if Token = Tok_Function or else Token = Tok_Procedure then
1031 Body_Node := P_Subprogram (Pf_Pbod);
1033 elsif Token = Tok_Package then
1034 Body_Node := P_Package (Pf_Pbod);
1036 elsif Token = Tok_Protected then
1037 Scan; -- past PROTECTED
1039 if Token = Tok_Body then
1040 Body_Node := P_Protected;
1042 Error_Msg_AP ("BODY expected");
1046 elsif Token = Tok_Task then
1049 if Token = Tok_Body then
1050 Body_Node := P_Task;
1052 Error_Msg_AP ("BODY expected");
1057 Error_Msg_SC ("proper body expected");
1061 Set_Proper_Body (Subunit_Node, Body_Node);
1062 return Subunit_Node;
1070 function Set_Location return Source_Ptr is
1073 Scan_State : Saved_Scan_State;
1076 -- A special check. If the first token is pragma, and this is a
1077 -- Source_Reference pragma, then do NOT eat previous comments, since
1078 -- the Source_Reference pragma is required to be the first line in
1081 if Token = Tok_Pragma then
1082 Save_Scan_State (Scan_State);
1083 Scan; -- past Pragma
1085 if Token = Tok_Identifier
1086 and then Token_Name = Name_Source_Reference
1088 Restore_Scan_State (Scan_State);
1092 Restore_Scan_State (Scan_State);
1095 -- Otherwise acquire previous comments and blank lines
1097 if Prev_Token = No_Token then
1098 return Source_First (Current_Source_File);
1101 Loc := Prev_Token_Ptr;
1103 exit when Loc = Token_Ptr;
1105 -- Should we worry about UTF_32 line terminators here
1107 if Source (Loc) in Line_Terminator then
1108 Skip_Line_Terminators (Loc, Physical);
1123 -- The format of the generated line, as expected by GNATCHOP is
1125 -- Unit {unit} line {line}, file offset {offs} [, SR], file name {file}
1129 -- {unit} unit name with terminating (spec) or (body)
1130 -- {line} starting line number
1131 -- {offs} offset to start of text in file
1132 -- {file} source file name
1134 -- The SR parameter is present only if a source reference pragma was
1135 -- scanned for this unit. The significance is that gnatchop should not
1136 -- attempt to add another one.
1138 procedure Unit_Display
1141 SR_Present : Boolean)
1143 Unum : constant Unit_Number_Type := Get_Cunit_Unit_Number (Cunit);
1144 Sind : constant Source_File_Index := Source_Index (Unum);
1145 Unam : constant Unit_Name_Type := Unit_Name (Unum);
1149 Write_Str ("Unit ");
1150 Write_Unit_Name (Unit_Name (Unum));
1151 Unit_Location (Sind, Loc);
1157 Write_Str (", file name ");
1158 Write_Name (Get_File_Name (Unam, Nkind (Unit (Cunit)) = N_Subunit));
1167 procedure Unit_Location (Sind : Source_File_Index; Loc : Source_Ptr) is
1168 Line : constant Logical_Line_Number := Get_Logical_Line_Number (Loc);
1169 -- Should the above be the physical line number ???
1172 Write_Str (" line ");
1173 Write_Int (Int (Line));
1175 Write_Str (", file offset ");
1176 Write_Int (Int (Loc) - Int (Source_First (Sind)));