?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
2013-03-08 François Dumont <fdumont@gcc.gnu.org>
[official-gcc.git] / gcc / ada / lib-load.adb
blobbe4c5376c36116dba939f8d32fa76f82aacb780a
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) 1992-2012, 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 with Atree; use Atree;
27 with Debug; use Debug;
28 with Einfo; use Einfo;
29 with Errout; use Errout;
30 with Fname; use Fname;
31 with Fname.UF; use Fname.UF;
32 with Nlists; use Nlists;
33 with Nmake; use Nmake;
34 with Opt; use Opt;
35 with Osint; use Osint;
36 with Osint.C; use Osint.C;
37 with Output; use Output;
38 with Par;
39 with Restrict; use Restrict;
40 with Scn; use Scn;
41 with Sinfo; use Sinfo;
42 with Sinput; use Sinput;
43 with Sinput.L; use Sinput.L;
44 with Stand; use Stand;
45 with Tbuild; use Tbuild;
46 with Uname; use Uname;
47
48 package body Lib.Load is
49
50 -----------------------
51 -- Local Subprograms --
52 -----------------------
53
54 function From_Limited_With_Chain return Boolean;
55 -- Check whether a possible circular dependence includes units that
56 -- have been loaded through limited_with clauses, in which case there
57 -- is no real circularity.
58
59 function Spec_Is_Irrelevant
60 (Spec_Unit : Unit_Number_Type;
61 Body_Unit : Unit_Number_Type) return Boolean;
62 -- The Spec_Unit and Body_Unit parameters are the unit numbers of the
63 -- spec file that corresponds to the main unit which is a body. This
64 -- function determines if the spec file is irrelevant and will be
65 -- overridden by the body as described in RM 10.1.4(4). See description
66 -- in "Special Handling of Subprogram Bodies" for further details.
67
68 procedure Write_Dependency_Chain;
69 -- This procedure is used to generate error message info lines that
70 -- trace the current dependency chain when a load error occurs.
71
72 ------------------------------
73 -- Change_Main_Unit_To_Spec --
74 ------------------------------
75
76 procedure Change_Main_Unit_To_Spec is
77 U : Unit_Record renames Units.Table (Main_Unit);
78 N : File_Name_Type;
79 X : Source_File_Index;
80
81 begin
82 -- Get name of unit body
83
84 Get_Name_String (U.Unit_File_Name);
85
86 -- Note: for the following we should really generalize and consult the
87 -- file name pattern data, but for now we just deal with the common
88 -- naming cases, which is probably good enough in practice ???
89
90 -- Change .adb to .ads
91
92 if Name_Len >= 5
93 and then Name_Buffer (Name_Len - 3 .. Name_Len) = ".adb"
94 then
95 Name_Buffer (Name_Len) := 's';
96
97 -- Change .2.ada to .1.ada (Rational convention)
98
99 elsif Name_Len >= 7
100 and then Name_Buffer (Name_Len - 5 .. Name_Len) = ".2.ada"
101 then
102 Name_Buffer (Name_Len - 4) := '1';
103
104 -- Change .ada to _.ada (DEC convention)
105
106 elsif Name_Len >= 5
107 and then Name_Buffer (Name_Len - 3 .. Name_Len) = ".ada"
108 then
109 Name_Buffer (Name_Len - 3 .. Name_Len + 1) := "_.ada";
110 Name_Len := Name_Len + 1;
111
112 -- No match, don't make the change
113
114 else
115 return;
116 end if;
117
118 -- Try loading the spec
119
120 N := Name_Find;
121 X := Load_Source_File (N);
122
123 -- No change if we did not find the spec
124
125 if X = No_Source_File then
126 return;
127 end if;
128
129 -- Otherwise modify Main_Unit entry to point to spec
130
131 U.Unit_File_Name := N;
132 U.Source_Index := X;
133 end Change_Main_Unit_To_Spec;
134
135 -------------------------------
136 -- Create_Dummy_Package_Unit --
137 -------------------------------
138
139 function Create_Dummy_Package_Unit
140 (With_Node : Node_Id;
141 Spec_Name : Unit_Name_Type) return Unit_Number_Type
142 is
143 Unum : Unit_Number_Type;
144 Cunit_Entity : Entity_Id;
145 Cunit : Node_Id;
146 Du_Name : Node_Or_Entity_Id;
147 End_Lab : Node_Id;
148 Save_CS : constant Boolean := Get_Comes_From_Source_Default;
149
150 begin
151 -- The created dummy package unit does not come from source
152
153 Set_Comes_From_Source_Default (False);
154
155 -- Normal package
156
157 if Nkind (Name (With_Node)) = N_Identifier then
158 Cunit_Entity :=
159 Make_Defining_Identifier (No_Location,
160 Chars => Chars (Name (With_Node)));
161 Du_Name := Cunit_Entity;
162 End_Lab := New_Occurrence_Of (Cunit_Entity, No_Location);
163
164 -- Child package
165
166 else
167 Cunit_Entity :=
168 Make_Defining_Identifier (No_Location,
169 Chars => Chars (Selector_Name (Name (With_Node))));
170 Du_Name :=
171 Make_Defining_Program_Unit_Name (No_Location,
172 Name => Copy_Separate_Tree (Prefix (Name (With_Node))),
173 Defining_Identifier => Cunit_Entity);
174
175 Set_Is_Child_Unit (Cunit_Entity);
176
177 End_Lab :=
178 Make_Designator (No_Location,
179 Name => Copy_Separate_Tree (Prefix (Name (With_Node))),
180 Identifier => New_Occurrence_Of (Cunit_Entity, No_Location));
181 end if;
182
183 Set_Scope (Cunit_Entity, Standard_Standard);
184
185 Cunit :=
186 Make_Compilation_Unit (No_Location,
187 Context_Items => Empty_List,
188 Unit =>
189 Make_Package_Declaration (No_Location,
190 Specification =>
191 Make_Package_Specification (No_Location,
192 Defining_Unit_Name => Du_Name,
193 Visible_Declarations => Empty_List,
194 End_Label => End_Lab)),
195 Aux_Decls_Node =>
196 Make_Compilation_Unit_Aux (No_Location));
197
198 -- Mark the dummy package as analyzed to prevent analysis of this
199 -- (non-existent) unit in -gnatQ mode because at the moment the
200 -- structure and attributes of this dummy package does not allow
201 -- a normal analysis of this unit
202
203 Set_Analyzed (Cunit);
204
205 Units.Increment_Last;
206 Unum := Units.Last;
207
208 Units.Table (Unum) := (
209 Cunit => Cunit,
210 Cunit_Entity => Cunit_Entity,
211 Dependency_Num => 0,
212 Dynamic_Elab => False,
213 Error_Location => Sloc (With_Node),
214 Expected_Unit => Spec_Name,
215 Fatal_Error => True,
216 Generate_Code => False,
217 Has_Allocator => False,
218 Has_RACW => False,
219 Is_Compiler_Unit => False,
220 Ident_String => Empty,
221 Loading => False,
222 Main_Priority => Default_Main_Priority,
223 Main_CPU => Default_Main_CPU,
224 Munit_Index => 0,
225 Serial_Number => 0,
226 Source_Index => No_Source_File,
227 Unit_File_Name => Get_File_Name (Spec_Name, Subunit => False),
228 Unit_Name => Spec_Name,
229 Version => 0,
230 OA_Setting => 'O');
231
232 Set_Comes_From_Source_Default (Save_CS);
233 Set_Error_Posted (Cunit_Entity);
234 Set_Error_Posted (Cunit);
235 return Unum;
236 end Create_Dummy_Package_Unit;
237
238 -----------------------------
239 -- From_Limited_With_Chain --
240 -----------------------------
241
242 function From_Limited_With_Chain return Boolean is
243 Curr_Num : constant Unit_Number_Type :=
244 Load_Stack.Table (Load_Stack.Last).Unit_Number;
245
246 begin
247 -- True if the current load operation is through a limited_with clause
248 -- and we are not within a loop of regular with_clauses.
249
250 for U in reverse Load_Stack.First .. Load_Stack.Last - 1 loop
251 if Load_Stack.Table (U).Unit_Number = Curr_Num then
252 return False;
253
254 elsif Present (Load_Stack.Table (U).With_Node)
255 and then Limited_Present (Load_Stack.Table (U).With_Node)
256 then
257 return True;
258 end if;
259 end loop;
260
261 return False;
262 end From_Limited_With_Chain;
263
264 ----------------
265 -- Initialize --
266 ----------------
267
268 procedure Initialize is
269 begin
270 Units.Init;
271 Load_Stack.Init;
272 end Initialize;
273
274 ------------------------
275 -- Initialize_Version --
276 ------------------------
277
278 procedure Initialize_Version (U : Unit_Number_Type) is
279 begin
280 Units.Table (U).Version := Source_Checksum (Source_Index (U));
281 end Initialize_Version;
282
283 ----------------------
284 -- Load_Main_Source --
285 ----------------------
286
287 procedure Load_Main_Source is
288 Fname : File_Name_Type;
289 Version : Word := 0;
290
291 begin
292 Load_Stack.Increment_Last;
293 Load_Stack.Table (Load_Stack.Last) := (Main_Unit, Empty);
294
295 -- Initialize unit table entry for Main_Unit. Note that we don't know
296 -- the unit name yet, that gets filled in when the parser parses the
297 -- main unit, at which time a check is made that it matches the main
298 -- file name, and then the Unit_Name field is set. The Cunit and
299 -- Cunit_Entity fields also get filled in later by the parser.
300
301 Units.Increment_Last;
302 Fname := Next_Main_Source;
303
304 Units.Table (Main_Unit).Unit_File_Name := Fname;
305
306 if Fname /= No_File then
307 Main_Source_File := Load_Source_File (Fname);
308 Current_Error_Source_File := Main_Source_File;
309
310 if Main_Source_File /= No_Source_File then
311 Version := Source_Checksum (Main_Source_File);
312 end if;
313
314 Units.Table (Main_Unit) := (
315 Cunit => Empty,
316 Cunit_Entity => Empty,
317 Dependency_Num => 0,
318 Dynamic_Elab => False,
319 Error_Location => No_Location,
320 Expected_Unit => No_Unit_Name,
321 Fatal_Error => False,
322 Generate_Code => False,
323 Has_Allocator => False,
324 Has_RACW => False,
325 Is_Compiler_Unit => False,
326 Ident_String => Empty,
327 Loading => True,
328 Main_Priority => Default_Main_Priority,
329 Main_CPU => Default_Main_CPU,
330 Munit_Index => 0,
331 Serial_Number => 0,
332 Source_Index => Main_Source_File,
333 Unit_File_Name => Fname,
334 Unit_Name => No_Unit_Name,
335 Version => Version,
336 OA_Setting => 'O');
337 end if;
338 end Load_Main_Source;
339
340 ---------------
341 -- Load_Unit --
342 ---------------
343
344 function Load_Unit
345 (Load_Name : Unit_Name_Type;
346 Required : Boolean;
347 Error_Node : Node_Id;
348 Subunit : Boolean;
349 Corr_Body : Unit_Number_Type := No_Unit;
350 Renamings : Boolean := False;
351 With_Node : Node_Id := Empty;
352 PMES : Boolean := False) return Unit_Number_Type
353 is
354 Calling_Unit : Unit_Number_Type;
355 Uname_Actual : Unit_Name_Type;
356 Unum : Unit_Number_Type;
357 Unump : Unit_Number_Type;
358 Fname : File_Name_Type;
359 Src_Ind : Source_File_Index;
360 Save_PMES : constant Boolean := Parsing_Main_Extended_Source;
361
362 Save_Cunit_Restrictions : constant Save_Cunit_Boolean_Restrictions :=
363 Cunit_Boolean_Restrictions_Save;
364 -- Save current restrictions for restore at end
365
366 begin
367 Parsing_Main_Extended_Source := PMES;
368
369 -- Initialize restrictions to config restrictions for unit to load if
370 -- it is part of the main extended source, otherwise reset them.
371
372 -- Note: it's a bit odd but PMES is False for subunits, which is why
373 -- we have the OR here. Should be investigated some time???
374
375 if PMES or Subunit then
376 Restore_Config_Cunit_Boolean_Restrictions;
377 else
378 Reset_Cunit_Boolean_Restrictions;
379 end if;
380
381 -- If renamings are allowed and we have a child unit name, then we
382 -- must first load the parent to deal with finding the real name.
383 -- Retain the with_clause that names the child, so that if it is
384 -- limited, the parent is loaded under the same condition.
385
386 if Renamings and then Is_Child_Name (Load_Name) then
387 Unump :=
388 Load_Unit
389 (Load_Name => Get_Parent_Spec_Name (Load_Name),
390 Required => Required,
391 Subunit => False,
392 Renamings => True,
393 Error_Node => Error_Node,
394 With_Node => With_Node);
395
396 if Unump = No_Unit then
397 Parsing_Main_Extended_Source := Save_PMES;
398 return No_Unit;
399 end if;
400
401 -- If parent is a renaming, then we use the renamed package as
402 -- the actual parent for the subsequent load operation.
403
404 if Nkind (Unit (Cunit (Unump))) = N_Package_Renaming_Declaration then
405 Uname_Actual :=
406 New_Child
407 (Load_Name, Get_Unit_Name (Name (Unit (Cunit (Unump)))));
408
409 -- If the load is for a with_clause, for visibility purposes both
410 -- the renamed entity and renaming one must be available in the
411 -- current unit: the renamed one in order to retrieve the child
412 -- unit, and the original one because it may be used as a prefix
413 -- in the body of the current unit. We add an explicit with_clause
414 -- for the original parent so that the renaming declaration is
415 -- properly loaded and analyzed.
416
417 if Present (With_Node) then
418 Insert_After (With_Node,
419 Make_With_Clause (Sloc (With_Node),
420 Name => Copy_Separate_Tree (Prefix (Name (With_Node)))));
421 end if;
422
423 -- Save the renaming entity, to establish its visibility when
424 -- installing the context. The implicit with is on this entity,
425 -- not on the package it renames. This is somewhat redundant given
426 -- the with_clause just created, but it simplifies subsequent
427 -- expansion of the current with_clause. Optimizable ???
428
429 if Nkind (Error_Node) = N_With_Clause
430 and then Nkind (Name (Error_Node)) = N_Selected_Component
431 then
432 declare
433 Par : Node_Id := Name (Error_Node);
434
435 begin
436 while Nkind (Par) = N_Selected_Component
437 and then Chars (Selector_Name (Par)) /=
438 Chars (Cunit_Entity (Unump))
439 loop
440 Par := Prefix (Par);
441 end loop;
442
443 -- Case of some intermediate parent is a renaming
444
445 if Nkind (Par) = N_Selected_Component then
446 Set_Entity (Selector_Name (Par), Cunit_Entity (Unump));
447
448 -- Case where the ultimate parent is a renaming
449
450 else
451 Set_Entity (Par, Cunit_Entity (Unump));
452 end if;
453 end;
454 end if;
455
456 -- If the parent is not a renaming, then get its name (this may
457 -- be different from the parent spec name obtained above because
458 -- of renamings higher up in the hierarchy).
459
460 else
461 Uname_Actual := New_Child (Load_Name, Unit_Name (Unump));
462 end if;
463
464 -- Here if unit to be loaded is not a child unit
465
466 else
467 Uname_Actual := Load_Name;
468 end if;
469
470 Fname := Get_File_Name (Uname_Actual, Subunit);
471
472 if Debug_Flag_L then
473 Write_Eol;
474 Write_Str ("*** Load request for unit: ");
475 Write_Unit_Name (Load_Name);
476
477 if Required then
478 Write_Str (" (Required = True)");
479 else
480 Write_Str (" (Required = False)");
481 end if;
482
483 Write_Eol;
484
485 if Uname_Actual /= Load_Name then
486 Write_Str ("*** Actual unit loaded: ");
487 Write_Unit_Name (Uname_Actual);
488 end if;
489 end if;
490
491 -- Capture error location if it is for the main unit. The idea is to
492 -- post errors on the main unit location, not the most recent unit.
493 -- Note: Unit_Name (Main_Unit) is not set if we are parsing gnat.adc.
494
495 if Present (Error_Node)
496 and then Unit_Name (Main_Unit) /= No_Unit_Name
497 then
498 -- It seems like In_Extended_Main_Source_Unit (Error_Node) would
499 -- do the trick here, but that's wrong, it is much too early to
500 -- call this routine. We are still in the parser, and the required
501 -- semantic information is not established yet. So we base the
502 -- judgment on unit names.
503
504 Get_External_Unit_Name_String (Unit_Name (Main_Unit));
505
506 declare
507 Main_Unit_Name : constant String := Name_Buffer (1 .. Name_Len);
508
509 begin
510 Get_External_Unit_Name_String
511 (Unit_Name (Get_Source_Unit (Error_Node)));
512
513 -- If the two names are identical, then for sure we are part
514 -- of the extended main unit
515
516 if Main_Unit_Name = Name_Buffer (1 .. Name_Len) then
517 Load_Msg_Sloc := Sloc (Error_Node);
518
519 -- If the load is called from a with_type clause, the error
520 -- node is correct.
521
522 -- Otherwise, check for the subunit case, and if so, consider
523 -- we have a match if one name is a prefix of the other name.
524
525 else
526 if Nkind (Unit (Cunit (Main_Unit))) = N_Subunit
527 or else
528 Nkind (Unit (Cunit (Get_Source_Unit (Error_Node)))) =
529 N_Subunit
530 then
531 Name_Len := Integer'Min (Name_Len, Main_Unit_Name'Length);
532
533 if Name_Buffer (1 .. Name_Len)
534 =
535 Main_Unit_Name (1 .. Name_Len)
536 then
537 Load_Msg_Sloc := Sloc (Error_Node);
538 end if;
539 end if;
540 end if;
541 end;
542 end if;
543
544 -- If we are generating error messages, then capture calling unit
545
546 if Present (Error_Node) then
547 Calling_Unit := Get_Source_Unit (Error_Node);
548 else
549 Calling_Unit := No_Unit;
550 end if;
551
552 -- See if we already have an entry for this unit
553
554 Unum := Main_Unit;
555 while Unum <= Units.Last loop
556 exit when Uname_Actual = Units.Table (Unum).Unit_Name;
557 Unum := Unum + 1;
558 end loop;
559
560 -- Whether or not the entry was found, Unum is now the right value,
561 -- since it is one more than Units.Last (i.e. the index of the new
562 -- entry we will create) in the not found case.
563
564 -- A special check is necessary in the unit not found case. If the unit
565 -- is not found, but the file in which it lives has already been loaded,
566 -- then we have the problem that the file does not contain the unit that
567 -- is needed. We simply treat this as a file not found condition.
568
569 -- We skip this test in multiple unit per file mode since in this
570 -- case we can have multiple units from the same source file.
571
572 if Unum > Units.Last and then Get_Unit_Index (Uname_Actual) = 0 then
573 for J in Units.First .. Units.Last loop
574 if Fname = Units.Table (J).Unit_File_Name then
575 if Debug_Flag_L then
576 Write_Str (" file does not contain unit, Unit_Number = ");
577 Write_Int (Int (Unum));
578 Write_Eol;
579 Write_Eol;
580 end if;
581
582 if Present (Error_Node) then
583 if Is_Predefined_File_Name (Fname) then
584 Error_Msg_Unit_1 := Uname_Actual;
585 Error_Msg
586 ("$$ is not a language defined unit", Load_Msg_Sloc);
587 else
588 Error_Msg_File_1 := Fname;
589 Error_Msg_Unit_1 := Uname_Actual;
590 Error_Msg ("File{ does not contain unit$", Load_Msg_Sloc);
591 end if;
592
593 Write_Dependency_Chain;
594 Unum := No_Unit;
595 goto Done;
596
597 else
598 Unum := No_Unit;
599 goto Done;
600 end if;
601 end if;
602 end loop;
603 end if;
604
605 -- If we are proceeding with load, then make load stack entry,
606 -- and indicate the kind of with_clause responsible for the load.
607
608 Load_Stack.Increment_Last;
609 Load_Stack.Table (Load_Stack.Last) := (Unum, With_Node);
610
611 -- Case of entry already in table
612
613 if Unum <= Units.Last then
614
615 -- Here is where we check for a circular dependency, which is
616 -- an attempt to load a unit which is currently in the process
617 -- of being loaded. We do *not* care about a circular chain that
618 -- leads back to a body, because this kind of circular dependence
619 -- legitimately occurs (e.g. two package bodies that contain
620 -- inlined subprogram referenced by the other).
621
622 -- Ada 2005 (AI-50217): We also ignore limited_with clauses, because
623 -- their purpose is precisely to create legal circular structures.
624
625 if Loading (Unum)
626 and then (Is_Spec_Name (Units.Table (Unum).Unit_Name)
627 or else Acts_As_Spec (Units.Table (Unum).Cunit))
628 and then (Nkind (Error_Node) /= N_With_Clause
629 or else not Limited_Present (Error_Node))
630 and then not From_Limited_With_Chain
631 then
632 if Debug_Flag_L then
633 Write_Str (" circular dependency encountered");
634 Write_Eol;
635 end if;
636
637 if Present (Error_Node) then
638 Error_Msg ("circular unit dependency", Load_Msg_Sloc);
639 Write_Dependency_Chain;
640 else
641 Load_Stack.Decrement_Last;
642 end if;
643
644 Unum := No_Unit;
645 goto Done;
646 end if;
647
648 if Debug_Flag_L then
649 Write_Str (" unit already in file table, Unit_Number = ");
650 Write_Int (Int (Unum));
651 Write_Eol;
652 end if;
653
654 Load_Stack.Decrement_Last;
655 goto Done;
656
657 -- Unit is not already in table, so try to open the file
658
659 else
660 if Debug_Flag_L then
661 Write_Str (" attempt unit load, Unit_Number = ");
662 Write_Int (Int (Unum));
663 Write_Eol;
664 end if;
665
666 Src_Ind := Load_Source_File (Fname);
667
668 -- Make a partial entry in the file table, used even in the file not
669 -- found case to print the dependency chain including the last entry
670
671 Units.Increment_Last;
672 Units.Table (Unum).Unit_Name := Uname_Actual;
673
674 -- File was found
675
676 if Src_Ind /= No_Source_File then
677 Units.Table (Unum) := (
678 Cunit => Empty,
679 Cunit_Entity => Empty,
680 Dependency_Num => 0,
681 Dynamic_Elab => False,
682 Error_Location => Sloc (Error_Node),
683 Expected_Unit => Uname_Actual,
684 Fatal_Error => False,
685 Generate_Code => False,
686 Has_Allocator => False,
687 Has_RACW => False,
688 Is_Compiler_Unit => False,
689 Ident_String => Empty,
690 Loading => True,
691 Main_Priority => Default_Main_Priority,
692 Main_CPU => Default_Main_CPU,
693 Munit_Index => 0,
694 Serial_Number => 0,
695 Source_Index => Src_Ind,
696 Unit_File_Name => Fname,
697 Unit_Name => Uname_Actual,
698 Version => Source_Checksum (Src_Ind),
699 OA_Setting => 'O');
700
701 -- Parse the new unit
702
703 declare
704 Save_Index : constant Nat := Multiple_Unit_Index;
705 Save_PMES : constant Boolean := Parsing_Main_Extended_Source;
706
707 begin
708 Multiple_Unit_Index := Get_Unit_Index (Uname_Actual);
709 Units.Table (Unum).Munit_Index := Multiple_Unit_Index;
710 Initialize_Scanner (Unum, Source_Index (Unum));
711
712 if Calling_Unit = Main_Unit and then Subunit then
713 Parsing_Main_Extended_Source := True;
714 end if;
715
716 Discard_List (Par (Configuration_Pragmas => False));
717
718 Parsing_Main_Extended_Source := Save_PMES;
719
720 Multiple_Unit_Index := Save_Index;
721 Set_Loading (Unum, False);
722 end;
723
724 -- If spec is irrelevant, then post errors and quit
725
726 if Corr_Body /= No_Unit
727 and then Spec_Is_Irrelevant (Unum, Corr_Body)
728 then
729 Error_Msg_File_1 := Unit_File_Name (Corr_Body);
730 Error_Msg
731 ("cannot compile subprogram in file {!", Load_Msg_Sloc);
732 Error_Msg_File_1 := Unit_File_Name (Unum);
733 Error_Msg
734 ("\incorrect spec in file { must be removed first!",
735 Load_Msg_Sloc);
736 Unum := No_Unit;
737 goto Done;
738 end if;
739
740 -- If loaded unit had a fatal error, then caller inherits it!
741
742 if Units.Table (Unum).Fatal_Error
743 and then Present (Error_Node)
744 then
745 Units.Table (Calling_Unit).Fatal_Error := True;
746 end if;
747
748 -- Remove load stack entry and return the entry in the file table
749
750 Load_Stack.Decrement_Last;
751
752 -- All done, return unit number
753
754 goto Done;
755
756 -- Case of file not found
757
758 else
759 if Debug_Flag_L then
760 Write_Str (" file was not found, load failed");
761 Write_Eol;
762 end if;
763
764 -- Generate message if unit required
765
766 if Required and then Present (Error_Node) then
767 if Is_Predefined_File_Name (Fname) then
768
769 -- This is a predefined library unit which is not present
770 -- in the run time. If a predefined unit is not available
771 -- it may very likely be the case that there is also pragma
772 -- Restriction forbidding its usage. This is typically the
773 -- case when building a configurable run time, where the
774 -- usage of certain run-time units is restricted by means
775 -- of both the corresponding pragma Restriction (such as
776 -- No_Calendar), and by not including the unit. Hence, we
777 -- check whether this predefined unit is forbidden, so that
778 -- the message about the restriction violation is generated,
779 -- if needed.
780
781 Check_Restricted_Unit (Load_Name, Error_Node);
782
783 Error_Msg_Unit_1 := Uname_Actual;
784 Error_Msg -- CODEFIX
785 ("$$ is not a predefined library unit", Load_Msg_Sloc);
786
787 else
788 Error_Msg_File_1 := Fname;
789 Error_Msg ("file{ not found", Load_Msg_Sloc);
790 end if;
791
792 Write_Dependency_Chain;
793
794 -- Remove unit from stack, to avoid cascaded errors on
795 -- subsequent missing files.
796
797 Load_Stack.Decrement_Last;
798 Units.Decrement_Last;
799
800 -- If unit not required, remove load stack entry and the junk
801 -- file table entry, and return No_Unit to indicate not found,
802
803 else
804 Load_Stack.Decrement_Last;
805 Units.Decrement_Last;
806 end if;
807
808 Unum := No_Unit;
809 goto Done;
810 end if;
811 end if;
812
813 -- Here to exit, with result in Unum
814
815 <<Done>>
816 Parsing_Main_Extended_Source := Save_PMES;
817 Cunit_Boolean_Restrictions_Restore (Save_Cunit_Restrictions);
818 return Unum;
819 end Load_Unit;
820
821 --------------------------
822 -- Make_Child_Decl_Unit --
823 --------------------------
824
825 procedure Make_Child_Decl_Unit (N : Node_Id) is
826 Unit_Decl : constant Node_Id := Library_Unit (N);
827
828 begin
829 Units.Increment_Last;
830 Units.Table (Units.Last) := Units.Table (Get_Cunit_Unit_Number (N));
831 Units.Table (Units.Last).Unit_Name :=
832 Get_Spec_Name (Unit_Name (Get_Cunit_Unit_Number (N)));
833 Units.Table (Units.Last).Cunit := Unit_Decl;
834 Units.Table (Units.Last).Cunit_Entity :=
835 Defining_Identifier
836 (Defining_Unit_Name (Specification (Unit (Unit_Decl))));
837
838 -- The library unit created for of a child subprogram unit plays no
839 -- role in code generation and binding, so label it accordingly.
840
841 Units.Table (Units.Last).Generate_Code := False;
842 Set_Has_No_Elaboration_Code (Unit_Decl);
843 end Make_Child_Decl_Unit;
844
845 ------------------------
846 -- Make_Instance_Unit --
847 ------------------------
848
849 -- If the unit is an instance, it appears as a package declaration, but
850 -- contains both declaration and body of the instance. The body becomes
851 -- the main unit of the compilation, and the declaration is inserted
852 -- at the end of the unit table. The main unit now has the name of a
853 -- body, which is constructed from the name of the original spec,
854 -- and is attached to the compilation node of the original unit. The
855 -- declaration has been attached to a new compilation unit node, and
856 -- code will have to be generated for it.
857
858 procedure Make_Instance_Unit (N : Node_Id; In_Main : Boolean) is
859 Sind : constant Source_File_Index := Source_Index (Main_Unit);
860
861 begin
862 Units.Increment_Last;
863
864 if In_Main then
865 Units.Table (Units.Last) := Units.Table (Main_Unit);
866 Units.Table (Units.Last).Cunit := Library_Unit (N);
867 Units.Table (Units.Last).Generate_Code := True;
868 Units.Table (Main_Unit).Cunit := N;
869 Units.Table (Main_Unit).Unit_Name :=
870 Get_Body_Name
871 (Unit_Name (Get_Cunit_Unit_Number (Library_Unit (N))));
872 Units.Table (Main_Unit).Version := Source_Checksum (Sind);
873
874 else
875 -- Duplicate information from instance unit, for the body. The unit
876 -- node N has been rewritten as a body, but it was placed in the
877 -- units table when first loaded as a declaration.
878
879 Units.Table (Units.Last) := Units.Table (Get_Cunit_Unit_Number (N));
880 Units.Table (Units.Last).Cunit := Library_Unit (N);
881 end if;
882 end Make_Instance_Unit;
883
884 ------------------------
885 -- Spec_Is_Irrelevant --
886 ------------------------
887
888 function Spec_Is_Irrelevant
889 (Spec_Unit : Unit_Number_Type;
890 Body_Unit : Unit_Number_Type) return Boolean
891 is
892 Sunit : constant Node_Id := Cunit (Spec_Unit);
893 Bunit : constant Node_Id := Cunit (Body_Unit);
894
895 begin
896 -- The spec is irrelevant if the body is a subprogram body, and the spec
897 -- is other than a subprogram spec or generic subprogram spec. Note that
898 -- the names must be the same, we don't need to check that, because we
899 -- already know that from the fact that the file names are the same.
900
901 return
902 Nkind (Unit (Bunit)) = N_Subprogram_Body
903 and then Nkind (Unit (Sunit)) /= N_Subprogram_Declaration
904 and then Nkind (Unit (Sunit)) /= N_Generic_Subprogram_Declaration;
905 end Spec_Is_Irrelevant;
906
907 --------------------
908 -- Version_Update --
909 --------------------
910
911 procedure Version_Update (U : Node_Id; From : Node_Id) is
912 Unum : constant Unit_Number_Type := Get_Cunit_Unit_Number (U);
913 Fnum : constant Unit_Number_Type := Get_Cunit_Unit_Number (From);
914 begin
915 if Source_Index (Fnum) /= No_Source_File then
916 Units.Table (Unum).Version :=
917 Units.Table (Unum).Version
918 xor
919 Source_Checksum (Source_Index (Fnum));
920 end if;
921 end Version_Update;
922
923 ----------------------------
924 -- Write_Dependency_Chain --
925 ----------------------------
926
927 procedure Write_Dependency_Chain is
928 begin
929 -- The dependency chain is only written if it is at least two entries
930 -- deep, otherwise it is trivial (the main unit depending on a unit
931 -- that it obviously directly depends on).
932
933 if Load_Stack.Last - 1 > Load_Stack.First then
934 for U in Load_Stack.First .. Load_Stack.Last - 1 loop
935 Error_Msg_Unit_1 :=
936 Unit_Name (Load_Stack.Table (U).Unit_Number);
937 Error_Msg_Unit_2 :=
938 Unit_Name (Load_Stack.Table (U + 1).Unit_Number);
939 Error_Msg ("$ depends on $!", Load_Msg_Sloc);
940 end loop;
941 end if;
942 end Write_Dependency_Chain;
943
944 end Lib.Load;
Mirror of the offical gcc git repository hosted at gcc.gnu.org