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testsuite: 32 bit AIX 2 byte wchar
[official-gcc.git] / gcc / ada / lib-load.adb
blob72196b437f507bb16ede5ec3f22a114b1e1fb906
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT COMPILER COMPONENTS --
4 -- --
5 -- L I B . L O A D --
6 -- --
7 -- B o d y --
8 -- --
9 -- Copyright (C) 1992-2023, 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 with Atree; use Atree;
27 with Debug; use Debug;
28 with Einfo; use Einfo;
29 with Einfo.Entities; use Einfo.Entities;
30 with Errout; use Errout;
31 with Fname; use Fname;
32 with Fname.UF; use Fname.UF;
33 with Nlists; use Nlists;
34 with Nmake; use Nmake;
35 with Opt; use Opt;
36 with Osint; use Osint;
37 with Osint.C; use Osint.C;
38 with Output; use Output;
39 with Par;
40 with Restrict; use Restrict;
41 with Scn; use Scn;
42 with Sinfo; use Sinfo;
43 with Sinfo.Nodes; use Sinfo.Nodes;
44 with Sinfo.Utils; use Sinfo.Utils;
45 with Sinput; use Sinput;
46 with Sinput.L; use Sinput.L;
47 with Stand; use Stand;
48 with Tbuild; use Tbuild;
49 with Uname; use Uname;
50
51 package body Lib.Load is
52
53 -----------------------
54 -- Local Subprograms --
55 -----------------------
56
57 function From_Limited_With_Chain return Boolean;
58 -- Check whether a possible circular dependence includes units that
59 -- have been loaded through limited_with clauses, in which case there
60 -- is no real circularity.
61
62 function Spec_Is_Irrelevant
63 (Spec_Unit : Unit_Number_Type;
64 Body_Unit : Unit_Number_Type) return Boolean;
65 -- The Spec_Unit and Body_Unit parameters are the unit numbers of the
66 -- spec file that corresponds to the main unit which is a body. This
67 -- function determines if the spec file is irrelevant and will be
68 -- overridden by the body as described in RM 10.1.4(4). See description
69 -- in "Special Handling of Subprogram Bodies" for further details.
70
71 procedure Write_Dependency_Chain;
72 -- This procedure is used to generate error message info lines that
73 -- trace the current dependency chain when a load error occurs.
74
75 ------------------------------
76 -- Change_Main_Unit_To_Spec --
77 ------------------------------
78
79 procedure Change_Main_Unit_To_Spec is
80 U : Unit_Record renames Units.Table (Main_Unit);
81 N : File_Name_Type;
82 X : Source_File_Index;
83
84 begin
85 -- Get name of unit body
86
87 Get_Name_String (U.Unit_File_Name);
88
89 -- Note: for the following we should really generalize and consult the
90 -- file name pattern data, but for now we just deal with the common
91 -- naming cases, which is good enough in practice.
92
93 -- Change .adb to .ads
94
95 if Name_Len >= 5
96 and then Name_Buffer (Name_Len - 3 .. Name_Len) = ".adb"
97 then
98 Name_Buffer (Name_Len) := 's';
99
100 -- Change .2.ada to .1.ada (Rational convention)
101
102 elsif Name_Len >= 7
103 and then Name_Buffer (Name_Len - 5 .. Name_Len) = ".2.ada"
104 then
105 Name_Buffer (Name_Len - 4) := '1';
106
107 -- Change .ada to _.ada (DEC convention)
108
109 elsif Name_Len >= 5
110 and then Name_Buffer (Name_Len - 3 .. Name_Len) = ".ada"
111 then
112 Name_Buffer (Name_Len - 3 .. Name_Len + 1) := "_.ada";
113 Name_Len := Name_Len + 1;
114
115 -- No match, don't make the change
116
117 else
118 return;
119 end if;
120
121 -- Try loading the spec
122
123 N := Name_Find;
124 X := Load_Source_File (N);
125
126 -- No change if we did not find the spec
127
128 if X <= No_Source_File then
129 return;
130 end if;
131
132 -- Otherwise modify Main_Unit entry to point to spec
133
134 U.Unit_File_Name := N;
135 U.Source_Index := X;
136 end Change_Main_Unit_To_Spec;
137
138 -------------------------------
139 -- Create_Dummy_Package_Unit --
140 -------------------------------
141
142 function Create_Dummy_Package_Unit
143 (With_Node : Node_Id;
144 Spec_Name : Unit_Name_Type) return Unit_Number_Type
145 is
146 Unum : Unit_Number_Type;
147 Cunit_Entity : Entity_Id;
148 Cunit : Node_Id;
149 Du_Name : Node_Or_Entity_Id;
150 End_Lab : Node_Id;
151 Fname : constant File_Name_Type :=
152 Get_File_Name (Spec_Name, Subunit => False);
153 Pre_Name : constant Boolean :=
154 Is_Predefined_File_Name (Fname, Renamings_Included => False);
155 Ren_Name : constant Boolean :=
156 Is_Predefined_Renaming_File_Name (Fname);
157 GNAT_Name : constant Boolean :=
158 Is_GNAT_File_Name (Fname);
159 Save_CS : constant Boolean := Get_Comes_From_Source_Default;
160
161 begin
162 -- The created dummy package unit does not come from source
163
164 Set_Comes_From_Source_Default (False);
165
166 -- Normal package
167
168 if Nkind (Name (With_Node)) = N_Identifier then
169 Cunit_Entity :=
170 Make_Defining_Identifier (No_Location,
171 Chars => Chars (Name (With_Node)));
172 Du_Name := Cunit_Entity;
173 End_Lab := New_Occurrence_Of (Cunit_Entity, No_Location);
174
175 -- Child package
176
177 else
178 Cunit_Entity :=
179 Make_Defining_Identifier (No_Location,
180 Chars => Chars (Selector_Name (Name (With_Node))));
181 Du_Name :=
182 Make_Defining_Program_Unit_Name (No_Location,
183 Name => Copy_Separate_Tree (Prefix (Name (With_Node))),
184 Defining_Identifier => Cunit_Entity);
185
186 Set_Is_Child_Unit (Cunit_Entity);
187
188 End_Lab :=
189 Make_Designator (No_Location,
190 Name => Copy_Separate_Tree (Prefix (Name (With_Node))),
191 Identifier => New_Occurrence_Of (Cunit_Entity, No_Location));
192 end if;
193
194 Set_Scope (Cunit_Entity, Standard_Standard);
195
196 Cunit :=
197 Make_Compilation_Unit (No_Location,
198 Context_Items => Empty_List,
199 Unit =>
200 Make_Package_Declaration (No_Location,
201 Specification =>
202 Make_Package_Specification (No_Location,
203 Defining_Unit_Name => Du_Name,
204 Visible_Declarations => Empty_List,
205 End_Label => End_Lab)),
206 Aux_Decls_Node =>
207 Make_Compilation_Unit_Aux (No_Location));
208
209 -- Mark the dummy package as analyzed to prevent analysis of this
210 -- (non-existent) unit in -gnatQ mode because at the moment the
211 -- structure and attributes of this dummy package does not allow
212 -- a normal analysis of this unit
213
214 Set_Analyzed (Cunit);
215
216 Units.Increment_Last;
217 Unum := Units.Last;
218
219 Units.Table (Unum) :=
220 (Cunit => Cunit,
221 Cunit_Entity => Cunit_Entity,
222 Dependency_Num => 0,
223 Dynamic_Elab => False,
224 Error_Location => Sloc (With_Node),
225 Expected_Unit => Spec_Name,
226 Fatal_Error => Error_Detected,
227 Generate_Code => False,
228 Has_RACW => False,
229 Filler => False,
230 Ident_String => Empty,
231
232 Is_Predefined_Renaming => Ren_Name,
233 Is_Predefined_Unit => Pre_Name or Ren_Name,
234 Is_Internal_Unit => Pre_Name or Ren_Name or GNAT_Name,
235 Filler2 => False,
236
237 Loading => False,
238 Main_Priority => Default_Main_Priority,
239 Main_CPU => Default_Main_CPU,
240 Primary_Stack_Count => 0,
241 Sec_Stack_Count => 0,
242 Munit_Index => 0,
243 No_Elab_Code_All => False,
244 Serial_Number => 0,
245 Source_Index => No_Source_File,
246 Unit_File_Name => Fname,
247 Unit_Name => Spec_Name,
248 Version => 0,
249 OA_Setting => 'O');
250
251 Init_Unit_Name (Unum, Spec_Name);
252
253 Set_Comes_From_Source_Default (Save_CS);
254 Set_Error_Posted (Cunit_Entity);
255 Set_Error_Posted (Cunit);
256 return Unum;
257 end Create_Dummy_Package_Unit;
258
259 -----------------------------
260 -- From_Limited_With_Chain --
261 -----------------------------
262
263 function From_Limited_With_Chain return Boolean is
264 Curr_Num : constant Unit_Number_Type :=
265 Load_Stack.Table (Load_Stack.Last).Unit_Number;
266
267 begin
268 -- True if the current load operation is through a limited_with clause
269 -- and we are not within a loop of regular with_clauses.
270
271 for U in reverse Load_Stack.First .. Load_Stack.Last - 1 loop
272 if Load_Stack.Table (U).Unit_Number = Curr_Num then
273 return False;
274
275 elsif Present (Load_Stack.Table (U).With_Node)
276 and then Limited_Present (Load_Stack.Table (U).With_Node)
277 then
278 return True;
279 end if;
280 end loop;
281
282 return False;
283 end From_Limited_With_Chain;
284
285 ----------------
286 -- Initialize --
287 ----------------
288
289 procedure Initialize is
290 begin
291 Units.Init;
292 Load_Stack.Init;
293 end Initialize;
294
295 ------------------------
296 -- Initialize_Version --
297 ------------------------
298
299 procedure Initialize_Version (U : Unit_Number_Type) is
300 begin
301 Units.Table (U).Version := Source_Checksum (Source_Index (U));
302 end Initialize_Version;
303
304 ----------------------
305 -- Load_Main_Source --
306 ----------------------
307
308 procedure Load_Main_Source is
309 Fname : constant File_Name_Type := Next_Main_Source;
310 Pre_Name : constant Boolean :=
311 Is_Predefined_File_Name (Fname, Renamings_Included => False);
312 Ren_Name : constant Boolean :=
313 Is_Predefined_Renaming_File_Name (Fname);
314 GNAT_Name : constant Boolean :=
315 Is_GNAT_File_Name (Fname);
316 Version : Word := 0;
317
318 begin
319 Load_Stack.Increment_Last;
320 Load_Stack.Table (Load_Stack.Last) := (Main_Unit, Empty);
321
322 -- Initialize unit table entry for Main_Unit. Note that we don't know
323 -- the unit name yet, that gets filled in when the parser parses the
324 -- main unit, at which time a check is made that it matches the main
325 -- file name, and then the Unit_Name field is set. The Cunit and
326 -- Cunit_Entity fields also get filled in later by the parser.
327
328 Units.Increment_Last;
329
330 Units.Table (Main_Unit).Unit_File_Name := Fname;
331
332 if Fname /= No_File then
333 Main_Source_File := Load_Source_File (Fname);
334 Current_Error_Source_File := Main_Source_File;
335
336 if Main_Source_File > No_Source_File then
337 Version := Source_Checksum (Main_Source_File);
338
339 else
340 -- To avoid emitting a source location (since there is no file),
341 -- we write a custom error message instead of using the machinery
342 -- in errout.adb.
343
344 Set_Standard_Error;
345
346 if Main_Source_File = No_Access_To_Source_File then
347 Write_Str
348 ("no read access for file """ & Get_Name_String (Fname)
349 & """");
350 else
351 Write_Str
352 ("file """ & Get_Name_String (Fname) & """ not found");
353 end if;
354
355 Write_Eol;
356 Set_Standard_Output;
357 end if;
358
359 Units.Table (Main_Unit) :=
360 (Cunit => Empty,
361 Cunit_Entity => Empty,
362 Dependency_Num => 0,
363 Dynamic_Elab => False,
364 Error_Location => No_Location,
365 Expected_Unit => No_Unit_Name,
366 Fatal_Error => None,
367 Generate_Code => True,
368 Has_RACW => False,
369 Filler => False,
370 Ident_String => Empty,
371
372 Is_Predefined_Renaming => Ren_Name,
373 Is_Predefined_Unit => Pre_Name or Ren_Name,
374 Is_Internal_Unit => Pre_Name or Ren_Name or GNAT_Name,
375 Filler2 => False,
376
377 Loading => True,
378 Main_Priority => Default_Main_Priority,
379 Main_CPU => Default_Main_CPU,
380 Primary_Stack_Count => 0,
381 Sec_Stack_Count => 0,
382
383 Munit_Index => 0,
384 No_Elab_Code_All => False,
385 Serial_Number => 0,
386 Source_Index => Main_Source_File,
387 Unit_File_Name => Fname,
388 Unit_Name => No_Unit_Name,
389 Version => Version,
390 OA_Setting => 'O');
391 end if;
392 end Load_Main_Source;
393
394 ---------------
395 -- Load_Unit --
396 ---------------
397
398 function Load_Unit
399 (Load_Name : Unit_Name_Type;
400 Required : Boolean;
401 Error_Node : Node_Id;
402 Subunit : Boolean;
403 Corr_Body : Unit_Number_Type := No_Unit;
404 Renamings : Boolean := False;
405 With_Node : Node_Id := Empty;
406 PMES : Boolean := False) return Unit_Number_Type
407 is
408 Calling_Unit : Unit_Number_Type;
409 Uname_Actual : Unit_Name_Type;
410 Unum : Unit_Number_Type;
411 Unump : Unit_Number_Type;
412 Fname : File_Name_Type;
413 Pre_Name : Boolean;
414 Ren_Name : Boolean;
415 GNAT_Name : Boolean;
416 Src_Ind : Source_File_Index;
417 Save_PMES : constant Boolean := Parsing_Main_Extended_Source;
418
419 Save_Cunit_Restrictions : constant Save_Cunit_Boolean_Restrictions :=
420 Cunit_Boolean_Restrictions_Save;
421 -- Save current restrictions for restore at end
422
423 begin
424 Parsing_Main_Extended_Source := PMES;
425
426 -- Initialize restrictions to config restrictions for unit to load if
427 -- it is part of the main extended source, otherwise reset them.
428
429 -- Note: it's a bit odd but PMES is False for subunits, which is why
430 -- we have the OR here.
431
432 if PMES or Subunit then
433 Restore_Config_Cunit_Boolean_Restrictions;
434 else
435 Reset_Cunit_Boolean_Restrictions;
436 end if;
437
438 -- If renamings are allowed and we have a child unit name, then we
439 -- must first load the parent to deal with finding the real name.
440 -- Retain the with_clause that names the child, so that if it is
441 -- limited, the parent is loaded under the same condition.
442
443 if Renamings and then Is_Child_Name (Load_Name) then
444 Unump :=
445 Load_Unit
446 (Load_Name => Get_Parent_Spec_Name (Load_Name),
447 Required => Required,
448 Subunit => False,
449 Renamings => True,
450 Error_Node => Error_Node,
451 With_Node => With_Node);
452
453 if Unump = No_Unit then
454 Unum := No_Unit;
455 goto Done;
456 end if;
457
458 -- If parent is a renaming, then we use the renamed package as
459 -- the actual parent for the subsequent load operation.
460
461 if Nkind (Unit (Cunit (Unump))) = N_Package_Renaming_Declaration then
462 Uname_Actual :=
463 New_Child
464 (Load_Name, Get_Unit_Name (Name (Unit (Cunit (Unump)))));
465
466 -- If the load is for a with_clause, for visibility purposes both
467 -- the renamed entity and renaming one must be available in the
468 -- current unit: the renamed one in order to retrieve the child
469 -- unit, and the original one because it may be used as a prefix
470 -- in the body of the current unit. We add an explicit with_clause
471 -- for the original parent so that the renaming declaration is
472 -- properly loaded and analyzed.
473
474 if Present (With_Node) then
475 Insert_After (With_Node,
476 Make_With_Clause (Sloc (With_Node),
477 Name => Copy_Separate_Tree (Prefix (Name (With_Node)))));
478 end if;
479
480 -- Save the renaming entity, to establish its visibility when
481 -- installing the context. The implicit with is on this entity,
482 -- not on the package it renames. This is somewhat redundant given
483 -- the with_clause just created, but it simplifies subsequent
484 -- expansion of the current with_clause.
485
486 if Nkind (Error_Node) = N_With_Clause
487 and then Nkind (Name (Error_Node)) = N_Selected_Component
488 then
489 declare
490 Par : Node_Id := Name (Error_Node);
491
492 begin
493 while Nkind (Par) = N_Selected_Component
494 and then Chars (Selector_Name (Par)) /=
495 Chars (Cunit_Entity (Unump))
496 loop
497 Par := Prefix (Par);
498 end loop;
499
500 -- Case of some intermediate parent is a renaming
501
502 if Nkind (Par) = N_Selected_Component then
503 Set_Entity (Selector_Name (Par), Cunit_Entity (Unump));
504
505 -- Case where the ultimate parent is a renaming
506
507 else
508 Set_Entity (Par, Cunit_Entity (Unump));
509 end if;
510 end;
511 end if;
512
513 -- If the parent is not a renaming, then get its name (this may
514 -- be different from the parent spec name obtained above because
515 -- of renamings higher up in the hierarchy).
516
517 else
518 Uname_Actual := New_Child (Load_Name, Unit_Name (Unump));
519 end if;
520
521 -- Here if unit to be loaded is not a child unit
522
523 else
524 Uname_Actual := Load_Name;
525 end if;
526
527 Fname := Get_File_Name (Uname_Actual, Subunit);
528 Pre_Name :=
529 Is_Predefined_File_Name (Fname, Renamings_Included => False);
530 Ren_Name := Is_Predefined_Renaming_File_Name (Fname);
531 GNAT_Name := Is_GNAT_File_Name (Fname);
532
533 if Debug_Flag_L then
534 Write_Eol;
535 Write_Str ("*** Load request for unit: ");
536 Write_Unit_Name (Load_Name);
537
538 if Required then
539 Write_Str (" (Required = True)");
540 else
541 Write_Str (" (Required = False)");
542 end if;
543
544 Write_Eol;
545
546 if Uname_Actual /= Load_Name then
547 Write_Str ("*** Actual unit loaded: ");
548 Write_Unit_Name (Uname_Actual);
549 end if;
550 end if;
551
552 -- Capture error location if it is for the main unit. The idea is to
553 -- post errors on the main unit location, not the most recent unit.
554 -- Note: Unit_Name (Main_Unit) is not set if we are parsing gnat.adc.
555
556 if Present (Error_Node)
557 and then Present (Unit_Name (Main_Unit))
558 then
559 -- It seems like In_Extended_Main_Source_Unit (Error_Node) would
560 -- do the trick here, but that's wrong, it is much too early to
561 -- call this routine. We are still in the parser, and the required
562 -- semantic information is not established yet. So we base the
563 -- judgment on unit names.
564
565 Get_External_Unit_Name_String (Unit_Name (Main_Unit));
566
567 declare
568 Main_Unit_Name : constant String := Name_Buffer (1 .. Name_Len);
569
570 begin
571 Get_External_Unit_Name_String
572 (Unit_Name (Get_Source_Unit (Error_Node)));
573
574 -- If the two names are identical, then for sure we are part
575 -- of the extended main unit
576
577 if Main_Unit_Name = Name_Buffer (1 .. Name_Len) then
578 Load_Msg_Sloc := Sloc (Error_Node);
579
580 -- If the load is called from a with_type clause, the error
581 -- node is correct.
582
583 -- Otherwise, check for the subunit case, and if so, consider
584 -- we have a match if one name is a prefix of the other name.
585
586 else
587 if Nkind (Unit (Cunit (Main_Unit))) = N_Subunit
588 or else
589 Nkind (Unit (Cunit (Get_Source_Unit (Error_Node)))) =
590 N_Subunit
591 then
592 Name_Len := Integer'Min (Name_Len, Main_Unit_Name'Length);
593
594 if Name_Buffer (1 .. Name_Len)
595 =
596 Main_Unit_Name (1 .. Name_Len)
597 then
598 Load_Msg_Sloc := Sloc (Error_Node);
599 end if;
600 end if;
601 end if;
602 end;
603 end if;
604
605 -- If we are generating error messages, then capture calling unit
606
607 if Present (Error_Node) then
608 Calling_Unit := Get_Source_Unit (Error_Node);
609 else
610 Calling_Unit := No_Unit;
611 end if;
612
613 -- See if we already have an entry for this unit
614
615 Unum := Unit_Names.Get (Uname_Actual);
616 if Unum = No_Unit then
617 Unum := Units.Last + 1;
618 end if;
619
620 -- Whether or not the entry was found, Unum is now the right value,
621 -- since it is one more than Units.Last (i.e. the index of the new
622 -- entry we will create) in the not found case.
623
624 -- A special check is necessary in the unit not found case. If the unit
625 -- is not found, but the file in which it lives has already been loaded,
626 -- then we have the problem that the file does not contain the unit that
627 -- is needed. We simply treat this as a file not found condition.
628
629 -- We skip this test in multiple unit per file mode since in this
630 -- case we can have multiple units from the same source file.
631
632 if Unum > Units.Last and then Get_Unit_Index (Uname_Actual) = 0 then
633 for J in Units.First .. Units.Last loop
634 if Fname = Units.Table (J).Unit_File_Name then
635 if Debug_Flag_L then
636 Write_Str (" file does not contain unit, Unit_Number = ");
637 Write_Int (Int (Unum));
638 Write_Eol;
639 Write_Eol;
640 end if;
641
642 if Present (Error_Node) then
643 Get_Name_String (Fname);
644
645 if Is_Predefined_File_Name (Fname) then
646 Error_Msg_Unit_1 := Uname_Actual;
647 Error_Msg
648 ("$$ is not a language defined unit",
649 Load_Msg_Sloc,
650 Error_Node);
651 else
652 Error_Msg_File_1 := Fname;
653 Error_Msg_Unit_1 := Uname_Actual;
654 Error_Msg
655 ("file{ does not contain unit$",
656 Load_Msg_Sloc,
657 Error_Node);
658 end if;
659
660 Write_Dependency_Chain;
661 Unum := No_Unit;
662 goto Done;
663
664 else
665 Unum := No_Unit;
666 goto Done;
667 end if;
668 end if;
669 end loop;
670 end if;
671
672 -- If we are proceeding with load, then make load stack entry,
673 -- and indicate the kind of with_clause responsible for the load.
674
675 Load_Stack.Increment_Last;
676 Load_Stack.Table (Load_Stack.Last) := (Unum, With_Node);
677
678 -- Case of entry already in table
679
680 if Unum <= Units.Last then
681
682 -- Here is where we check for a circular dependency, which is
683 -- an attempt to load a unit which is currently in the process
684 -- of being loaded. We do *not* care about a circular chain that
685 -- leads back to a body, because this kind of circular dependence
686 -- legitimately occurs (e.g. two package bodies that contain
687 -- inlined subprogram referenced by the other).
688
689 -- Ada 2005 (AI-50217): We also ignore limited_with clauses, because
690 -- their purpose is precisely to create legal circular structures.
691
692 if Loading (Unum)
693 and then (Is_Spec_Name (Units.Table (Unum).Unit_Name)
694 or else Acts_As_Spec (Units.Table (Unum).Cunit))
695 and then (Nkind (Error_Node) /= N_With_Clause
696 or else not Limited_Present (Error_Node))
697 and then not From_Limited_With_Chain
698 then
699 if Debug_Flag_L then
700 Write_Str (" circular dependency encountered");
701 Write_Eol;
702 end if;
703
704 if Present (Error_Node) then
705 Error_Msg
706 ("circular unit dependency", Load_Msg_Sloc, Error_Node);
707 Write_Dependency_Chain;
708 else
709 Load_Stack.Decrement_Last;
710 end if;
711
712 Unum := No_Unit;
713 goto Done;
714 end if;
715
716 if Debug_Flag_L then
717 Write_Str (" unit already in file table, Unit_Number = ");
718 Write_Int (Int (Unum));
719 Write_Eol;
720 end if;
721
722 Load_Stack.Decrement_Last;
723 goto Done;
724
725 -- Unit is not already in table, so try to open the file
726
727 else
728 if Debug_Flag_L then
729 Write_Str (" attempt unit load, Unit_Number = ");
730 Write_Int (Int (Unum));
731 Write_Eol;
732 end if;
733
734 Src_Ind := Load_Source_File (Fname);
735
736 -- Make a partial entry in the file table, used even in the file not
737 -- found case to print the dependency chain including the last entry
738
739 Units.Increment_Last;
740 Init_Unit_Name (Unum, Uname_Actual);
741
742 -- File was found
743
744 if Src_Ind > No_Source_File then
745 Units.Table (Unum) :=
746 (Cunit => Empty,
747 Cunit_Entity => Empty,
748 Dependency_Num => 0,
749 Dynamic_Elab => False,
750 Error_Location => Sloc (Error_Node),
751 Expected_Unit => Uname_Actual,
752 Fatal_Error => None,
753 Generate_Code => False,
754 Has_RACW => False,
755 Filler => False,
756 Ident_String => Empty,
757
758 Is_Predefined_Renaming => Ren_Name,
759 Is_Predefined_Unit => Pre_Name or Ren_Name,
760 Is_Internal_Unit => Pre_Name or Ren_Name or GNAT_Name,
761 Filler2 => False,
762
763 Loading => True,
764 Main_Priority => Default_Main_Priority,
765 Main_CPU => Default_Main_CPU,
766 Primary_Stack_Count => 0,
767 Sec_Stack_Count => 0,
768 Munit_Index => 0,
769 No_Elab_Code_All => False,
770 Serial_Number => 0,
771 Source_Index => Src_Ind,
772 Unit_File_Name => Fname,
773 Unit_Name => Uname_Actual,
774 Version => Source_Checksum (Src_Ind),
775 OA_Setting => 'O');
776
777 -- Parse the new unit
778
779 declare
780 Save_Index : constant Nat := Multiple_Unit_Index;
781 Save_PMES : constant Boolean := Parsing_Main_Extended_Source;
782
783 begin
784 Multiple_Unit_Index := Get_Unit_Index (Uname_Actual);
785 Units.Table (Unum).Munit_Index := Multiple_Unit_Index;
786 Initialize_Scanner (Unum, Source_Index (Unum));
787
788 if Calling_Unit = Main_Unit and then Subunit then
789 Parsing_Main_Extended_Source := True;
790 end if;
791
792 Discard_List (Par (Configuration_Pragmas => False));
793
794 Parsing_Main_Extended_Source := Save_PMES;
795
796 Multiple_Unit_Index := Save_Index;
797 Set_Loading (Unum, False);
798 end;
799
800 -- If spec is irrelevant, then post errors and quit
801
802 if Corr_Body /= No_Unit
803 and then Spec_Is_Irrelevant (Unum, Corr_Body)
804 then
805 Error_Msg_File_1 := Unit_File_Name (Corr_Body);
806 Error_Msg
807 ("cannot compile subprogram in file {!",
808 Load_Msg_Sloc,
809 Error_Node);
810 Error_Msg_File_1 := Unit_File_Name (Unum);
811 Error_Msg
812 ("\incorrect spec in file { must be removed first!",
813 Load_Msg_Sloc,
814 Error_Node);
815 Unum := No_Unit;
816 goto Done;
817 end if;
818
819 -- If loaded unit had an error, then caller inherits setting
820
821 if Present (Error_Node) then
822 case Units.Table (Unum).Fatal_Error is
823
824 -- Nothing to do if with'ed unit had no error
825
826 when None =>
827 null;
828
829 -- If with'ed unit had a detected fatal error, propagate it
830
831 when Error_Detected =>
832 Units.Table (Calling_Unit).Fatal_Error := Error_Detected;
833
834 -- If with'ed unit had an ignored error, then propagate it
835 -- but do not overide an existing setting.
836
837 when Error_Ignored =>
838 if Units.Table (Calling_Unit).Fatal_Error = None then
839 Units.Table (Calling_Unit).Fatal_Error :=
840 Error_Ignored;
841 end if;
842 end case;
843 end if;
844
845 -- Remove load stack entry and return the entry in the file table
846
847 Load_Stack.Decrement_Last;
848
849 -- All done, return unit number
850
851 goto Done;
852
853 -- Case of file not found
854
855 else
856 if Debug_Flag_L then
857 if Src_Ind = No_Access_To_Source_File then
858 Write_Str (" no read access to file, load failed");
859 else
860 Write_Str (" file was not found, load failed");
861 end if;
862
863 Write_Eol;
864 end if;
865
866 -- Generate message if unit required
867
868 if Required then
869 Get_Name_String (Fname);
870
871 if Is_Predefined_File_Name (Fname) then
872
873 -- This is a predefined library unit which is not present
874 -- in the run time. If a predefined unit is not available
875 -- it may very likely be the case that there is also pragma
876 -- Restriction forbidding its usage. This is typically the
877 -- case when building a configurable run time, where the
878 -- usage of certain run-time units is restricted by means
879 -- of both the corresponding pragma Restriction (such as
880 -- No_Calendar), and by not including the unit. Hence, we
881 -- check whether this predefined unit is forbidden, so that
882 -- the message about the restriction violation is generated,
883 -- if needed.
884
885 if Present (Error_Node) then
886 Check_Restricted_Unit (Load_Name, Error_Node);
887 end if;
888
889 Error_Msg_Unit_1 := Uname_Actual;
890 Error_Msg -- CODEFIX
891 ("$$ is not a predefined library unit",
892 Load_Msg_Sloc,
893 Error_Node);
894
895 else
896 Error_Msg_File_1 := Fname;
897
898 if Src_Ind = No_Access_To_Source_File then
899 Error_Msg
900 ("no read access to file{",
901 Load_Msg_Sloc,
902 Error_Node
903 );
904 else
905 Error_Msg ("file{ not found", Load_Msg_Sloc, Error_Node);
906 end if;
907 end if;
908
909 Write_Dependency_Chain;
910
911 -- Remove unit from stack, to avoid cascaded errors on
912 -- subsequent missing files.
913
914 Load_Stack.Decrement_Last;
915 Remove_Unit (Unum);
916
917 -- If unit not required, remove load stack entry and the junk
918 -- file table entry, and return No_Unit to indicate not found.
919
920 else
921 Load_Stack.Decrement_Last;
922 Remove_Unit (Unum);
923 end if;
924
925 Unum := No_Unit;
926 goto Done;
927 end if;
928 end if;
929
930 -- Here to exit, with result in Unum
931
932 <<Done>>
933 Parsing_Main_Extended_Source := Save_PMES;
934 Cunit_Boolean_Restrictions_Restore (Save_Cunit_Restrictions);
935 return Unum;
936 end Load_Unit;
937
938 --------------------------
939 -- Make_Child_Decl_Unit --
940 --------------------------
941
942 procedure Make_Child_Decl_Unit (N : Node_Id) is
943 Unit_Decl : constant Node_Id := Library_Unit (N);
944 Unit_Num : constant Unit_Number_Type := Get_Cunit_Unit_Number (N);
945
946 begin
947 Units.Increment_Last;
948 Units.Table (Units.Last) := Units.Table (Unit_Num);
949 Units.Table (Units.Last).Cunit := Unit_Decl;
950 Units.Table (Units.Last).Cunit_Entity :=
951 Defining_Identifier
952 (Defining_Unit_Name (Specification (Unit (Unit_Decl))));
953 Init_Unit_Name (Units.Last, Get_Spec_Name (Unit_Name (Unit_Num)));
954
955 -- The library unit created for of a child subprogram unit plays no
956 -- role in code generation and binding, so label it accordingly.
957
958 Units.Table (Units.Last).Generate_Code := False;
959 Set_Has_No_Elaboration_Code (Unit_Decl);
960 end Make_Child_Decl_Unit;
961
962 ------------------------
963 -- Make_Instance_Unit --
964 ------------------------
965
966 -- If the unit is an instance, it appears as a package declaration, but
967 -- contains both declaration and body of the instance. The body becomes
968 -- the main unit of the compilation, and the declaration is inserted
969 -- at the end of the unit table. The main unit now has the name of a
970 -- body, which is constructed from the name of the original spec,
971 -- and is attached to the compilation node of the original unit. The
972 -- declaration has been attached to a new compilation unit node, and
973 -- code will have to be generated for it.
974
975 procedure Make_Instance_Unit (N : Node_Id; In_Main : Boolean) is
976 Sind : constant Source_File_Index := Source_Index (Main_Unit);
977
978 begin
979 Units.Increment_Last;
980
981 if In_Main then
982 Units.Table (Units.Last) := Units.Table (Main_Unit);
983 Units.Table (Units.Last).Cunit := Library_Unit (N);
984 Init_Unit_Name (Units.Last, Unit_Name (Main_Unit));
985
986 Units.Table (Main_Unit).Cunit := N;
987 Units.Table (Main_Unit).Version := Source_Checksum (Sind);
988 Init_Unit_Name (Main_Unit,
989 Get_Body_Name
990 (Unit_Name (Get_Cunit_Unit_Number (Library_Unit (N)))));
991
992 else
993 -- Duplicate information from instance unit, for the body. The unit
994 -- node N has been rewritten as a body, but it was placed in the
995 -- units table when first loaded as a declaration.
996
997 Units.Table (Units.Last) := Units.Table (Get_Cunit_Unit_Number (N));
998 Units.Table (Units.Last).Cunit := Library_Unit (N);
999 end if;
1000 end Make_Instance_Unit;
1001
1002 ------------------------
1003 -- Spec_Is_Irrelevant --
1004 ------------------------
1005
1006 function Spec_Is_Irrelevant
1007 (Spec_Unit : Unit_Number_Type;
1008 Body_Unit : Unit_Number_Type) return Boolean
1009 is
1010 Sunit : constant Node_Id := Cunit (Spec_Unit);
1011 Bunit : constant Node_Id := Cunit (Body_Unit);
1012
1013 begin
1014 -- The spec is irrelevant if the body is a subprogram body, and the spec
1015 -- is other than a subprogram spec or generic subprogram spec. Note that
1016 -- the names must be the same, we don't need to check that, because we
1017 -- already know that from the fact that the file names are the same.
1018
1019 return
1020 Nkind (Unit (Bunit)) = N_Subprogram_Body
1021 and then Nkind (Unit (Sunit)) /= N_Subprogram_Declaration
1022 and then Nkind (Unit (Sunit)) /= N_Generic_Subprogram_Declaration;
1023 end Spec_Is_Irrelevant;
1024
1025 --------------------
1026 -- Version_Update --
1027 --------------------
1028
1029 procedure Version_Update (U : Node_Id; From : Node_Id) is
1030 Unum : constant Unit_Number_Type := Get_Cunit_Unit_Number (U);
1031 Fnum : constant Unit_Number_Type := Get_Cunit_Unit_Number (From);
1032 begin
1033 if Source_Index (Fnum) > No_Source_File then
1034 Units.Table (Unum).Version :=
1035 Units.Table (Unum).Version
1036 xor
1037 Source_Checksum (Source_Index (Fnum));
1038 end if;
1039 end Version_Update;
1040
1041 ----------------------------
1042 -- Write_Dependency_Chain --
1043 ----------------------------
1044
1045 procedure Write_Dependency_Chain is
1046 begin
1047 -- The dependency chain is only written if it is at least two entries
1048 -- deep, otherwise it is trivial (the main unit depending on a unit
1049 -- that it obviously directly depends on).
1050
1051 if Load_Stack.Last - 1 > Load_Stack.First then
1052 for U in Load_Stack.First .. Load_Stack.Last - 1 loop
1053 Error_Msg_Unit_1 :=
1054 Unit_Name (Load_Stack.Table (U).Unit_Number);
1055 Error_Msg_Unit_2 :=
1056 Unit_Name (Load_Stack.Table (U + 1).Unit_Number);
1057 Error_Msg ("$ depends on $!", Load_Msg_Sloc);
1058 end loop;
1059 end if;
1060 end Write_Dependency_Chain;
1061
1062 end Lib.Load;
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