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LWG 3035. std::allocator's constructors should be constexpr
[official-gcc.git] / gcc / ada / lib-load.adb
blob329e66050491964bb92cc09517cf407efdd31828
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) 1992-2018, 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 Fname : constant File_Name_Type :=
149 Get_File_Name (Spec_Name, Subunit => False);
150 Pre_Name : constant Boolean :=
151 Is_Predefined_File_Name (Fname, Renamings_Included => False);
152 Ren_Name : constant Boolean :=
153 Is_Predefined_Renaming_File_Name (Fname);
154 GNAT_Name : constant Boolean :=
155 Is_GNAT_File_Name (Fname);
156 Save_CS : constant Boolean := Get_Comes_From_Source_Default;
157
158 begin
159 -- The created dummy package unit does not come from source
160
161 Set_Comes_From_Source_Default (False);
162
163 -- Normal package
164
165 if Nkind (Name (With_Node)) = N_Identifier then
166 Cunit_Entity :=
167 Make_Defining_Identifier (No_Location,
168 Chars => Chars (Name (With_Node)));
169 Du_Name := Cunit_Entity;
170 End_Lab := New_Occurrence_Of (Cunit_Entity, No_Location);
171
172 -- Child package
173
174 else
175 Cunit_Entity :=
176 Make_Defining_Identifier (No_Location,
177 Chars => Chars (Selector_Name (Name (With_Node))));
178 Du_Name :=
179 Make_Defining_Program_Unit_Name (No_Location,
180 Name => Copy_Separate_Tree (Prefix (Name (With_Node))),
181 Defining_Identifier => Cunit_Entity);
182
183 Set_Is_Child_Unit (Cunit_Entity);
184
185 End_Lab :=
186 Make_Designator (No_Location,
187 Name => Copy_Separate_Tree (Prefix (Name (With_Node))),
188 Identifier => New_Occurrence_Of (Cunit_Entity, No_Location));
189 end if;
190
191 Set_Scope (Cunit_Entity, Standard_Standard);
192
193 Cunit :=
194 Make_Compilation_Unit (No_Location,
195 Context_Items => Empty_List,
196 Unit =>
197 Make_Package_Declaration (No_Location,
198 Specification =>
199 Make_Package_Specification (No_Location,
200 Defining_Unit_Name => Du_Name,
201 Visible_Declarations => Empty_List,
202 End_Label => End_Lab)),
203 Aux_Decls_Node =>
204 Make_Compilation_Unit_Aux (No_Location));
205
206 -- Mark the dummy package as analyzed to prevent analysis of this
207 -- (non-existent) unit in -gnatQ mode because at the moment the
208 -- structure and attributes of this dummy package does not allow
209 -- a normal analysis of this unit
210
211 Set_Analyzed (Cunit);
212
213 Units.Increment_Last;
214 Unum := Units.Last;
215
216 Units.Table (Unum) :=
217 (Cunit => Cunit,
218 Cunit_Entity => Cunit_Entity,
219 Dependency_Num => 0,
220 Dynamic_Elab => False,
221 Error_Location => Sloc (With_Node),
222 Expected_Unit => Spec_Name,
223 Fatal_Error => Error_Detected,
224 Generate_Code => False,
225 Has_RACW => False,
226 Filler => False,
227 Ident_String => Empty,
228
229 Is_Predefined_Renaming => Ren_Name,
230 Is_Predefined_Unit => Pre_Name or Ren_Name,
231 Is_Internal_Unit => Pre_Name or Ren_Name or GNAT_Name,
232 Filler2 => False,
233
234 Loading => False,
235 Main_Priority => Default_Main_Priority,
236 Main_CPU => Default_Main_CPU,
237 Primary_Stack_Count => 0,
238 Sec_Stack_Count => 0,
239 Munit_Index => 0,
240 No_Elab_Code_All => False,
241 Serial_Number => 0,
242 Source_Index => No_Source_File,
243 Unit_File_Name => Fname,
244 Unit_Name => Spec_Name,
245 Version => 0,
246 OA_Setting => 'O');
247
248 Set_Comes_From_Source_Default (Save_CS);
249 Set_Error_Posted (Cunit_Entity);
250 Set_Error_Posted (Cunit);
251 return Unum;
252 end Create_Dummy_Package_Unit;
253
254 -----------------------------
255 -- From_Limited_With_Chain --
256 -----------------------------
257
258 function From_Limited_With_Chain return Boolean is
259 Curr_Num : constant Unit_Number_Type :=
260 Load_Stack.Table (Load_Stack.Last).Unit_Number;
261
262 begin
263 -- True if the current load operation is through a limited_with clause
264 -- and we are not within a loop of regular with_clauses.
265
266 for U in reverse Load_Stack.First .. Load_Stack.Last - 1 loop
267 if Load_Stack.Table (U).Unit_Number = Curr_Num then
268 return False;
269
270 elsif Present (Load_Stack.Table (U).With_Node)
271 and then Limited_Present (Load_Stack.Table (U).With_Node)
272 then
273 return True;
274 end if;
275 end loop;
276
277 return False;
278 end From_Limited_With_Chain;
279
280 ----------------
281 -- Initialize --
282 ----------------
283
284 procedure Initialize is
285 begin
286 Units.Init;
287 Load_Stack.Init;
288 end Initialize;
289
290 ------------------------
291 -- Initialize_Version --
292 ------------------------
293
294 procedure Initialize_Version (U : Unit_Number_Type) is
295 begin
296 Units.Table (U).Version := Source_Checksum (Source_Index (U));
297 end Initialize_Version;
298
299 ----------------------
300 -- Load_Main_Source --
301 ----------------------
302
303 procedure Load_Main_Source is
304 Fname : constant File_Name_Type := Next_Main_Source;
305 Pre_Name : constant Boolean :=
306 Is_Predefined_File_Name (Fname, Renamings_Included => False);
307 Ren_Name : constant Boolean :=
308 Is_Predefined_Renaming_File_Name (Fname);
309 GNAT_Name : constant Boolean :=
310 Is_GNAT_File_Name (Fname);
311 Version : Word := 0;
312
313 begin
314 Load_Stack.Increment_Last;
315 Load_Stack.Table (Load_Stack.Last) := (Main_Unit, Empty);
316
317 -- Initialize unit table entry for Main_Unit. Note that we don't know
318 -- the unit name yet, that gets filled in when the parser parses the
319 -- main unit, at which time a check is made that it matches the main
320 -- file name, and then the Unit_Name field is set. The Cunit and
321 -- Cunit_Entity fields also get filled in later by the parser.
322
323 Units.Increment_Last;
324
325 Units.Table (Main_Unit).Unit_File_Name := Fname;
326
327 if Fname /= No_File then
328 Main_Source_File := Load_Source_File (Fname);
329 Current_Error_Source_File := Main_Source_File;
330
331 if Main_Source_File > No_Source_File then
332 Version := Source_Checksum (Main_Source_File);
333
334 else
335 -- To avoid emitting a source location (since there is no file),
336 -- we write a custom error message instead of using the machinery
337 -- in errout.adb.
338
339 Set_Standard_Error;
340
341 if Main_Source_File = No_Access_To_Source_File then
342 Write_Str
343 ("no read access for file """ & Get_Name_String (Fname)
344 & """");
345 else
346 Write_Str
347 ("file """ & Get_Name_String (Fname) & """ not found");
348 end if;
349
350 Write_Eol;
351 Set_Standard_Output;
352 end if;
353
354 Units.Table (Main_Unit) :=
355 (Cunit => Empty,
356 Cunit_Entity => Empty,
357 Dependency_Num => 0,
358 Dynamic_Elab => False,
359 Error_Location => No_Location,
360 Expected_Unit => No_Unit_Name,
361 Fatal_Error => None,
362 Generate_Code => False,
363 Has_RACW => False,
364 Filler => False,
365 Ident_String => Empty,
366
367 Is_Predefined_Renaming => Ren_Name,
368 Is_Predefined_Unit => Pre_Name or Ren_Name,
369 Is_Internal_Unit => Pre_Name or Ren_Name or GNAT_Name,
370 Filler2 => False,
371
372 Loading => True,
373 Main_Priority => Default_Main_Priority,
374 Main_CPU => Default_Main_CPU,
375 Primary_Stack_Count => 0,
376 Sec_Stack_Count => 0,
377
378 Munit_Index => 0,
379 No_Elab_Code_All => False,
380 Serial_Number => 0,
381 Source_Index => Main_Source_File,
382 Unit_File_Name => Fname,
383 Unit_Name => No_Unit_Name,
384 Version => Version,
385 OA_Setting => 'O');
386 end if;
387 end Load_Main_Source;
388
389 ---------------
390 -- Load_Unit --
391 ---------------
392
393 function Load_Unit
394 (Load_Name : Unit_Name_Type;
395 Required : Boolean;
396 Error_Node : Node_Id;
397 Subunit : Boolean;
398 Corr_Body : Unit_Number_Type := No_Unit;
399 Renamings : Boolean := False;
400 With_Node : Node_Id := Empty;
401 PMES : Boolean := False) return Unit_Number_Type
402 is
403 Calling_Unit : Unit_Number_Type;
404 Uname_Actual : Unit_Name_Type;
405 Unum : Unit_Number_Type;
406 Unump : Unit_Number_Type;
407 Fname : File_Name_Type;
408 Pre_Name : Boolean;
409 Ren_Name : Boolean;
410 GNAT_Name : Boolean;
411 Src_Ind : Source_File_Index;
412 Save_PMES : constant Boolean := Parsing_Main_Extended_Source;
413
414 Save_Cunit_Restrictions : constant Save_Cunit_Boolean_Restrictions :=
415 Cunit_Boolean_Restrictions_Save;
416 -- Save current restrictions for restore at end
417
418 begin
419 Parsing_Main_Extended_Source := PMES;
420
421 -- Initialize restrictions to config restrictions for unit to load if
422 -- it is part of the main extended source, otherwise reset them.
423
424 -- Note: it's a bit odd but PMES is False for subunits, which is why
425 -- we have the OR here. Should be investigated some time???
426
427 if PMES or Subunit then
428 Restore_Config_Cunit_Boolean_Restrictions;
429 else
430 Reset_Cunit_Boolean_Restrictions;
431 end if;
432
433 -- If renamings are allowed and we have a child unit name, then we
434 -- must first load the parent to deal with finding the real name.
435 -- Retain the with_clause that names the child, so that if it is
436 -- limited, the parent is loaded under the same condition.
437
438 if Renamings and then Is_Child_Name (Load_Name) then
439 Unump :=
440 Load_Unit
441 (Load_Name => Get_Parent_Spec_Name (Load_Name),
442 Required => Required,
443 Subunit => False,
444 Renamings => True,
445 Error_Node => Error_Node,
446 With_Node => With_Node);
447
448 if Unump = No_Unit then
449 Parsing_Main_Extended_Source := Save_PMES;
450 return No_Unit;
451 end if;
452
453 -- If parent is a renaming, then we use the renamed package as
454 -- the actual parent for the subsequent load operation.
455
456 if Nkind (Unit (Cunit (Unump))) = N_Package_Renaming_Declaration then
457 Uname_Actual :=
458 New_Child
459 (Load_Name, Get_Unit_Name (Name (Unit (Cunit (Unump)))));
460
461 -- If the load is for a with_clause, for visibility purposes both
462 -- the renamed entity and renaming one must be available in the
463 -- current unit: the renamed one in order to retrieve the child
464 -- unit, and the original one because it may be used as a prefix
465 -- in the body of the current unit. We add an explicit with_clause
466 -- for the original parent so that the renaming declaration is
467 -- properly loaded and analyzed.
468
469 if Present (With_Node) then
470 Insert_After (With_Node,
471 Make_With_Clause (Sloc (With_Node),
472 Name => Copy_Separate_Tree (Prefix (Name (With_Node)))));
473 end if;
474
475 -- Save the renaming entity, to establish its visibility when
476 -- installing the context. The implicit with is on this entity,
477 -- not on the package it renames. This is somewhat redundant given
478 -- the with_clause just created, but it simplifies subsequent
479 -- expansion of the current with_clause. Optimizable ???
480
481 if Nkind (Error_Node) = N_With_Clause
482 and then Nkind (Name (Error_Node)) = N_Selected_Component
483 then
484 declare
485 Par : Node_Id := Name (Error_Node);
486
487 begin
488 while Nkind (Par) = N_Selected_Component
489 and then Chars (Selector_Name (Par)) /=
490 Chars (Cunit_Entity (Unump))
491 loop
492 Par := Prefix (Par);
493 end loop;
494
495 -- Case of some intermediate parent is a renaming
496
497 if Nkind (Par) = N_Selected_Component then
498 Set_Entity (Selector_Name (Par), Cunit_Entity (Unump));
499
500 -- Case where the ultimate parent is a renaming
501
502 else
503 Set_Entity (Par, Cunit_Entity (Unump));
504 end if;
505 end;
506 end if;
507
508 -- If the parent is not a renaming, then get its name (this may
509 -- be different from the parent spec name obtained above because
510 -- of renamings higher up in the hierarchy).
511
512 else
513 Uname_Actual := New_Child (Load_Name, Unit_Name (Unump));
514 end if;
515
516 -- Here if unit to be loaded is not a child unit
517
518 else
519 Uname_Actual := Load_Name;
520 end if;
521
522 Fname := Get_File_Name (Uname_Actual, Subunit);
523 Pre_Name :=
524 Is_Predefined_File_Name (Fname, Renamings_Included => False);
525 Ren_Name := Is_Predefined_Renaming_File_Name (Fname);
526 GNAT_Name := Is_GNAT_File_Name (Fname);
527
528 if Debug_Flag_L then
529 Write_Eol;
530 Write_Str ("*** Load request for unit: ");
531 Write_Unit_Name (Load_Name);
532
533 if Required then
534 Write_Str (" (Required = True)");
535 else
536 Write_Str (" (Required = False)");
537 end if;
538
539 Write_Eol;
540
541 if Uname_Actual /= Load_Name then
542 Write_Str ("*** Actual unit loaded: ");
543 Write_Unit_Name (Uname_Actual);
544 end if;
545 end if;
546
547 -- Capture error location if it is for the main unit. The idea is to
548 -- post errors on the main unit location, not the most recent unit.
549 -- Note: Unit_Name (Main_Unit) is not set if we are parsing gnat.adc.
550
551 if Present (Error_Node)
552 and then Unit_Name (Main_Unit) /= No_Unit_Name
553 then
554 -- It seems like In_Extended_Main_Source_Unit (Error_Node) would
555 -- do the trick here, but that's wrong, it is much too early to
556 -- call this routine. We are still in the parser, and the required
557 -- semantic information is not established yet. So we base the
558 -- judgment on unit names.
559
560 Get_External_Unit_Name_String (Unit_Name (Main_Unit));
561
562 declare
563 Main_Unit_Name : constant String := Name_Buffer (1 .. Name_Len);
564
565 begin
566 Get_External_Unit_Name_String
567 (Unit_Name (Get_Source_Unit (Error_Node)));
568
569 -- If the two names are identical, then for sure we are part
570 -- of the extended main unit
571
572 if Main_Unit_Name = Name_Buffer (1 .. Name_Len) then
573 Load_Msg_Sloc := Sloc (Error_Node);
574
575 -- If the load is called from a with_type clause, the error
576 -- node is correct.
577
578 -- Otherwise, check for the subunit case, and if so, consider
579 -- we have a match if one name is a prefix of the other name.
580
581 else
582 if Nkind (Unit (Cunit (Main_Unit))) = N_Subunit
583 or else
584 Nkind (Unit (Cunit (Get_Source_Unit (Error_Node)))) =
585 N_Subunit
586 then
587 Name_Len := Integer'Min (Name_Len, Main_Unit_Name'Length);
588
589 if Name_Buffer (1 .. Name_Len)
590 =
591 Main_Unit_Name (1 .. Name_Len)
592 then
593 Load_Msg_Sloc := Sloc (Error_Node);
594 end if;
595 end if;
596 end if;
597 end;
598 end if;
599
600 -- If we are generating error messages, then capture calling unit
601
602 if Present (Error_Node) then
603 Calling_Unit := Get_Source_Unit (Error_Node);
604 else
605 Calling_Unit := No_Unit;
606 end if;
607
608 -- See if we already have an entry for this unit
609
610 Unum := Main_Unit;
611 while Unum <= Units.Last loop
612 exit when Uname_Actual = Units.Table (Unum).Unit_Name;
613 Unum := Unum + 1;
614 end loop;
615
616 -- Whether or not the entry was found, Unum is now the right value,
617 -- since it is one more than Units.Last (i.e. the index of the new
618 -- entry we will create) in the not found case.
619
620 -- A special check is necessary in the unit not found case. If the unit
621 -- is not found, but the file in which it lives has already been loaded,
622 -- then we have the problem that the file does not contain the unit that
623 -- is needed. We simply treat this as a file not found condition.
624
625 -- We skip this test in multiple unit per file mode since in this
626 -- case we can have multiple units from the same source file.
627
628 if Unum > Units.Last and then Get_Unit_Index (Uname_Actual) = 0 then
629 for J in Units.First .. Units.Last loop
630 if Fname = Units.Table (J).Unit_File_Name then
631 if Debug_Flag_L then
632 Write_Str (" file does not contain unit, Unit_Number = ");
633 Write_Int (Int (Unum));
634 Write_Eol;
635 Write_Eol;
636 end if;
637
638 if Present (Error_Node) then
639 Get_Name_String (Fname);
640
641 if Is_Predefined_File_Name (Fname) then
642 Error_Msg_Unit_1 := Uname_Actual;
643 Error_Msg
644 ("$$ is not a language defined unit", Load_Msg_Sloc);
645 else
646 Error_Msg_File_1 := Fname;
647 Error_Msg_Unit_1 := Uname_Actual;
648 Error_Msg ("File{ does not contain unit$", Load_Msg_Sloc);
649 end if;
650
651 Write_Dependency_Chain;
652 Unum := No_Unit;
653 goto Done;
654
655 else
656 Unum := No_Unit;
657 goto Done;
658 end if;
659 end if;
660 end loop;
661 end if;
662
663 -- If we are proceeding with load, then make load stack entry,
664 -- and indicate the kind of with_clause responsible for the load.
665
666 Load_Stack.Increment_Last;
667 Load_Stack.Table (Load_Stack.Last) := (Unum, With_Node);
668
669 -- Case of entry already in table
670
671 if Unum <= Units.Last then
672
673 -- Here is where we check for a circular dependency, which is
674 -- an attempt to load a unit which is currently in the process
675 -- of being loaded. We do *not* care about a circular chain that
676 -- leads back to a body, because this kind of circular dependence
677 -- legitimately occurs (e.g. two package bodies that contain
678 -- inlined subprogram referenced by the other).
679
680 -- Ada 2005 (AI-50217): We also ignore limited_with clauses, because
681 -- their purpose is precisely to create legal circular structures.
682
683 if Loading (Unum)
684 and then (Is_Spec_Name (Units.Table (Unum).Unit_Name)
685 or else Acts_As_Spec (Units.Table (Unum).Cunit))
686 and then (Nkind (Error_Node) /= N_With_Clause
687 or else not Limited_Present (Error_Node))
688 and then not From_Limited_With_Chain
689 then
690 if Debug_Flag_L then
691 Write_Str (" circular dependency encountered");
692 Write_Eol;
693 end if;
694
695 if Present (Error_Node) then
696 Error_Msg ("circular unit dependency", Load_Msg_Sloc);
697 Write_Dependency_Chain;
698 else
699 Load_Stack.Decrement_Last;
700 end if;
701
702 Unum := No_Unit;
703 goto Done;
704 end if;
705
706 if Debug_Flag_L then
707 Write_Str (" unit already in file table, Unit_Number = ");
708 Write_Int (Int (Unum));
709 Write_Eol;
710 end if;
711
712 Load_Stack.Decrement_Last;
713 goto Done;
714
715 -- Unit is not already in table, so try to open the file
716
717 else
718 if Debug_Flag_L then
719 Write_Str (" attempt unit load, Unit_Number = ");
720 Write_Int (Int (Unum));
721 Write_Eol;
722 end if;
723
724 Src_Ind := Load_Source_File (Fname);
725
726 -- Make a partial entry in the file table, used even in the file not
727 -- found case to print the dependency chain including the last entry
728
729 Units.Increment_Last;
730 Units.Table (Unum).Unit_Name := Uname_Actual;
731
732 -- File was found
733
734 if Src_Ind > No_Source_File then
735 Units.Table (Unum) :=
736 (Cunit => Empty,
737 Cunit_Entity => Empty,
738 Dependency_Num => 0,
739 Dynamic_Elab => False,
740 Error_Location => Sloc (Error_Node),
741 Expected_Unit => Uname_Actual,
742 Fatal_Error => None,
743 Generate_Code => False,
744 Has_RACW => False,
745 Filler => False,
746 Ident_String => Empty,
747
748 Is_Predefined_Renaming => Ren_Name,
749 Is_Predefined_Unit => Pre_Name or Ren_Name,
750 Is_Internal_Unit => Pre_Name or Ren_Name or GNAT_Name,
751 Filler2 => False,
752
753 Loading => True,
754 Main_Priority => Default_Main_Priority,
755 Main_CPU => Default_Main_CPU,
756 Primary_Stack_Count => 0,
757 Sec_Stack_Count => 0,
758 Munit_Index => 0,
759 No_Elab_Code_All => False,
760 Serial_Number => 0,
761 Source_Index => Src_Ind,
762 Unit_File_Name => Fname,
763 Unit_Name => Uname_Actual,
764 Version => Source_Checksum (Src_Ind),
765 OA_Setting => 'O');
766
767 -- Parse the new unit
768
769 declare
770 Save_Index : constant Nat := Multiple_Unit_Index;
771 Save_PMES : constant Boolean := Parsing_Main_Extended_Source;
772
773 begin
774 Multiple_Unit_Index := Get_Unit_Index (Uname_Actual);
775 Units.Table (Unum).Munit_Index := Multiple_Unit_Index;
776 Initialize_Scanner (Unum, Source_Index (Unum));
777
778 if Calling_Unit = Main_Unit and then Subunit then
779 Parsing_Main_Extended_Source := True;
780 end if;
781
782 Discard_List (Par (Configuration_Pragmas => False));
783
784 Parsing_Main_Extended_Source := Save_PMES;
785
786 Multiple_Unit_Index := Save_Index;
787 Set_Loading (Unum, False);
788 end;
789
790 -- If spec is irrelevant, then post errors and quit
791
792 if Corr_Body /= No_Unit
793 and then Spec_Is_Irrelevant (Unum, Corr_Body)
794 then
795 Error_Msg_File_1 := Unit_File_Name (Corr_Body);
796 Error_Msg
797 ("cannot compile subprogram in file {!", Load_Msg_Sloc);
798 Error_Msg_File_1 := Unit_File_Name (Unum);
799 Error_Msg
800 ("\incorrect spec in file { must be removed first!",
801 Load_Msg_Sloc);
802 Unum := No_Unit;
803 goto Done;
804 end if;
805
806 -- If loaded unit had an error, then caller inherits setting
807
808 if Present (Error_Node) then
809 case Units.Table (Unum).Fatal_Error is
810
811 -- Nothing to do if with'ed unit had no error
812
813 when None =>
814 null;
815
816 -- If with'ed unit had a detected fatal error, propagate it
817
818 when Error_Detected =>
819 Units.Table (Calling_Unit).Fatal_Error := Error_Detected;
820
821 -- If with'ed unit had an ignored error, then propagate it
822 -- but do not overide an existring setting.
823
824 when Error_Ignored =>
825 if Units.Table (Calling_Unit).Fatal_Error = None then
826 Units.Table (Calling_Unit).Fatal_Error :=
827 Error_Ignored;
828 end if;
829 end case;
830 end if;
831
832 -- Remove load stack entry and return the entry in the file table
833
834 Load_Stack.Decrement_Last;
835
836 -- All done, return unit number
837
838 goto Done;
839
840 -- Case of file not found
841
842 else
843 if Debug_Flag_L then
844 if Src_Ind = No_Access_To_Source_File then
845 Write_Str (" no read access to file, load failed");
846 else
847 Write_Str (" file was not found, load failed");
848 end if;
849
850 Write_Eol;
851 end if;
852
853 -- Generate message if unit required
854
855 if Required then
856 Get_Name_String (Fname);
857
858 if Is_Predefined_File_Name (Fname) then
859
860 -- This is a predefined library unit which is not present
861 -- in the run time. If a predefined unit is not available
862 -- it may very likely be the case that there is also pragma
863 -- Restriction forbidding its usage. This is typically the
864 -- case when building a configurable run time, where the
865 -- usage of certain run-time units is restricted by means
866 -- of both the corresponding pragma Restriction (such as
867 -- No_Calendar), and by not including the unit. Hence, we
868 -- check whether this predefined unit is forbidden, so that
869 -- the message about the restriction violation is generated,
870 -- if needed.
871
872 if Present (Error_Node) then
873 Check_Restricted_Unit (Load_Name, Error_Node);
874 end if;
875
876 Error_Msg_Unit_1 := Uname_Actual;
877 Error_Msg -- CODEFIX
878 ("$$ is not a predefined library unit", Load_Msg_Sloc);
879
880 else
881 Error_Msg_File_1 := Fname;
882
883 if Src_Ind = No_Access_To_Source_File then
884 Error_Msg ("no read access to file{", Load_Msg_Sloc);
885 else
886 Error_Msg ("file{ not found", Load_Msg_Sloc);
887 end if;
888 end if;
889
890 Write_Dependency_Chain;
891
892 -- Remove unit from stack, to avoid cascaded errors on
893 -- subsequent missing files.
894
895 Load_Stack.Decrement_Last;
896 Units.Decrement_Last;
897
898 -- If unit not required, remove load stack entry and the junk
899 -- file table entry, and return No_Unit to indicate not found,
900
901 else
902 Load_Stack.Decrement_Last;
903 Units.Decrement_Last;
904 end if;
905
906 Unum := No_Unit;
907 goto Done;
908 end if;
909 end if;
910
911 -- Here to exit, with result in Unum
912
913 <<Done>>
914 Parsing_Main_Extended_Source := Save_PMES;
915 Cunit_Boolean_Restrictions_Restore (Save_Cunit_Restrictions);
916 return Unum;
917 end Load_Unit;
918
919 --------------------------
920 -- Make_Child_Decl_Unit --
921 --------------------------
922
923 procedure Make_Child_Decl_Unit (N : Node_Id) is
924 Unit_Decl : constant Node_Id := Library_Unit (N);
925
926 begin
927 Units.Increment_Last;
928 Units.Table (Units.Last) := Units.Table (Get_Cunit_Unit_Number (N));
929 Units.Table (Units.Last).Unit_Name :=
930 Get_Spec_Name (Unit_Name (Get_Cunit_Unit_Number (N)));
931 Units.Table (Units.Last).Cunit := Unit_Decl;
932 Units.Table (Units.Last).Cunit_Entity :=
933 Defining_Identifier
934 (Defining_Unit_Name (Specification (Unit (Unit_Decl))));
935
936 -- The library unit created for of a child subprogram unit plays no
937 -- role in code generation and binding, so label it accordingly.
938
939 Units.Table (Units.Last).Generate_Code := False;
940 Set_Has_No_Elaboration_Code (Unit_Decl);
941 end Make_Child_Decl_Unit;
942
943 ------------------------
944 -- Make_Instance_Unit --
945 ------------------------
946
947 -- If the unit is an instance, it appears as a package declaration, but
948 -- contains both declaration and body of the instance. The body becomes
949 -- the main unit of the compilation, and the declaration is inserted
950 -- at the end of the unit table. The main unit now has the name of a
951 -- body, which is constructed from the name of the original spec,
952 -- and is attached to the compilation node of the original unit. The
953 -- declaration has been attached to a new compilation unit node, and
954 -- code will have to be generated for it.
955
956 procedure Make_Instance_Unit (N : Node_Id; In_Main : Boolean) is
957 Sind : constant Source_File_Index := Source_Index (Main_Unit);
958
959 begin
960 Units.Increment_Last;
961
962 if In_Main then
963 Units.Table (Units.Last) := Units.Table (Main_Unit);
964 Units.Table (Units.Last).Cunit := Library_Unit (N);
965 Units.Table (Units.Last).Generate_Code := True;
966 Units.Table (Main_Unit).Cunit := N;
967 Units.Table (Main_Unit).Unit_Name :=
968 Get_Body_Name
969 (Unit_Name (Get_Cunit_Unit_Number (Library_Unit (N))));
970 Units.Table (Main_Unit).Version := Source_Checksum (Sind);
971
972 else
973 -- Duplicate information from instance unit, for the body. The unit
974 -- node N has been rewritten as a body, but it was placed in the
975 -- units table when first loaded as a declaration.
976
977 Units.Table (Units.Last) := Units.Table (Get_Cunit_Unit_Number (N));
978 Units.Table (Units.Last).Cunit := Library_Unit (N);
979 end if;
980 end Make_Instance_Unit;
981
982 ------------------------
983 -- Spec_Is_Irrelevant --
984 ------------------------
985
986 function Spec_Is_Irrelevant
987 (Spec_Unit : Unit_Number_Type;
988 Body_Unit : Unit_Number_Type) return Boolean
989 is
990 Sunit : constant Node_Id := Cunit (Spec_Unit);
991 Bunit : constant Node_Id := Cunit (Body_Unit);
992
993 begin
994 -- The spec is irrelevant if the body is a subprogram body, and the spec
995 -- is other than a subprogram spec or generic subprogram spec. Note that
996 -- the names must be the same, we don't need to check that, because we
997 -- already know that from the fact that the file names are the same.
998
999 return
1000 Nkind (Unit (Bunit)) = N_Subprogram_Body
1001 and then Nkind (Unit (Sunit)) /= N_Subprogram_Declaration
1002 and then Nkind (Unit (Sunit)) /= N_Generic_Subprogram_Declaration;
1003 end Spec_Is_Irrelevant;
1004
1005 --------------------
1006 -- Version_Update --
1007 --------------------
1008
1009 procedure Version_Update (U : Node_Id; From : Node_Id) is
1010 Unum : constant Unit_Number_Type := Get_Cunit_Unit_Number (U);
1011 Fnum : constant Unit_Number_Type := Get_Cunit_Unit_Number (From);
1012 begin
1013 if Source_Index (Fnum) > No_Source_File then
1014 Units.Table (Unum).Version :=
1015 Units.Table (Unum).Version
1016 xor
1017 Source_Checksum (Source_Index (Fnum));
1018 end if;
1019 end Version_Update;
1020
1021 ----------------------------
1022 -- Write_Dependency_Chain --
1023 ----------------------------
1024
1025 procedure Write_Dependency_Chain is
1026 begin
1027 -- The dependency chain is only written if it is at least two entries
1028 -- deep, otherwise it is trivial (the main unit depending on a unit
1029 -- that it obviously directly depends on).
1030
1031 if Load_Stack.Last - 1 > Load_Stack.First then
1032 for U in Load_Stack.First .. Load_Stack.Last - 1 loop
1033 Error_Msg_Unit_1 :=
1034 Unit_Name (Load_Stack.Table (U).Unit_Number);
1035 Error_Msg_Unit_2 :=
1036 Unit_Name (Load_Stack.Table (U + 1).Unit_Number);
1037 Error_Msg ("$ depends on $!", Load_Msg_Sloc);
1038 end loop;
1039 end if;
1040 end Write_Dependency_Chain;
1041
1042 end Lib.Load;
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