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* gcc.c (getenv_spec_function): New function.
[official-gcc.git] / gcc / ada / lib-load.adb
blob420b4de19303c7e1b9a748045014e353d9fe031b
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) 1992-2006, 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 2, 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 COPYING. If not, write --
19 -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, USA. --
21 -- --
22 -- GNAT was originally developed by the GNAT team at New York University. --
23 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 -- --
25 ------------------------------------------------------------------------------
26
27 with Atree; use Atree;
28 with Debug; use Debug;
29 with Einfo; use Einfo;
30 with Errout; use Errout;
31 with Fname; use Fname;
32 with Fname.UF; use Fname.UF;
33 with Namet; use Namet;
34 with Nlists; use Nlists;
35 with Nmake; use Nmake;
36 with Opt; use Opt;
37 with Osint; use Osint;
38 with Osint.C; use Osint.C;
39 with Output; use Output;
40 with Par;
41 with Restrict; use Restrict;
42 with Scn; use Scn;
43 with Sinfo; use Sinfo;
44 with Sinput; use Sinput;
45 with Sinput.L; use Sinput.L;
46 with Stand; use Stand;
47 with Tbuild; use Tbuild;
48 with Uname; use Uname;
49
50 package body Lib.Load is
51
52 -----------------------
53 -- Local Subprograms --
54 -----------------------
55
56 function From_Limited_With_Chain (Lim : Boolean) return Boolean;
57 -- Check whether a possible circular dependence includes units that
58 -- have been loaded through limited_with clauses, in which case there
59 -- is no real circularity.
60
61 function Spec_Is_Irrelevant
62 (Spec_Unit : Unit_Number_Type;
63 Body_Unit : Unit_Number_Type) return Boolean;
64 -- The Spec_Unit and Body_Unit parameters are the unit numbers of the
65 -- spec file that corresponds to the main unit which is a body. This
66 -- function determines if the spec file is irrelevant and will be
67 -- overridden by the body as described in RM 10.1.4(4). See description
68 -- in "Special Handling of Subprogram Bodies" for further details.
69
70 procedure Write_Dependency_Chain;
71 -- This procedure is used to generate error message info lines that
72 -- trace the current dependency chain when a load error occurs.
73
74 -------------------------------
75 -- Create_Dummy_Package_Unit --
76 -------------------------------
77
78 function Create_Dummy_Package_Unit
79 (With_Node : Node_Id;
80 Spec_Name : Unit_Name_Type) return Unit_Number_Type
81 is
82 Unum : Unit_Number_Type;
83 Cunit_Entity : Entity_Id;
84 Cunit : Node_Id;
85 Du_Name : Node_Or_Entity_Id;
86 End_Lab : Node_Id;
87 Save_CS : constant Boolean := Get_Comes_From_Source_Default;
88
89 begin
90 -- The created dummy package unit does not come from source
91
92 Set_Comes_From_Source_Default (False);
93
94 -- Normal package
95
96 if Nkind (Name (With_Node)) = N_Identifier then
97 Cunit_Entity :=
98 Make_Defining_Identifier (No_Location,
99 Chars => Chars (Name (With_Node)));
100 Du_Name := Cunit_Entity;
101 End_Lab := New_Occurrence_Of (Cunit_Entity, No_Location);
102
103 -- Child package
104
105 else
106 Cunit_Entity :=
107 Make_Defining_Identifier (No_Location,
108 Chars => Chars (Selector_Name (Name (With_Node))));
109 Du_Name :=
110 Make_Defining_Program_Unit_Name (No_Location,
111 Name => New_Copy_Tree (Prefix (Name (With_Node))),
112 Defining_Identifier => Cunit_Entity);
113
114 Set_Is_Child_Unit (Cunit_Entity);
115
116 End_Lab :=
117 Make_Designator (No_Location,
118 Name => New_Copy_Tree (Prefix (Name (With_Node))),
119 Identifier => New_Occurrence_Of (Cunit_Entity, No_Location));
120 end if;
121
122 Set_Scope (Cunit_Entity, Standard_Standard);
123
124 Cunit :=
125 Make_Compilation_Unit (No_Location,
126 Context_Items => Empty_List,
127 Unit =>
128 Make_Package_Declaration (No_Location,
129 Specification =>
130 Make_Package_Specification (No_Location,
131 Defining_Unit_Name => Du_Name,
132 Visible_Declarations => Empty_List,
133 End_Label => End_Lab)),
134 Aux_Decls_Node =>
135 Make_Compilation_Unit_Aux (No_Location));
136
137 -- Mark the dummy package as analyzed to prevent analysis of this
138 -- (non-existent) unit in -gnatQ mode because at the moment the
139 -- structure and attributes of this dummy package does not allow
140 -- a normal analysis of this unit
141
142 Set_Analyzed (Cunit);
143
144 Units.Increment_Last;
145 Unum := Units.Last;
146
147 Units.Table (Unum) := (
148 Cunit => Cunit,
149 Cunit_Entity => Cunit_Entity,
150 Dependency_Num => 0,
151 Dynamic_Elab => False,
152 Error_Location => Sloc (With_Node),
153 Expected_Unit => Spec_Name,
154 Fatal_Error => True,
155 Generate_Code => False,
156 Has_RACW => False,
157 Ident_String => Empty,
158 Loading => False,
159 Main_Priority => Default_Main_Priority,
160 Munit_Index => 0,
161 Serial_Number => 0,
162 Source_Index => No_Source_File,
163 Unit_File_Name => Get_File_Name (Spec_Name, Subunit => False),
164 Unit_Name => Spec_Name,
165 Version => 0);
166
167 Set_Comes_From_Source_Default (Save_CS);
168 Set_Error_Posted (Cunit_Entity);
169 Set_Error_Posted (Cunit);
170 return Unum;
171 end Create_Dummy_Package_Unit;
172
173 -----------------------------
174 -- From_Limited_With_Chain --
175 -----------------------------
176
177 function From_Limited_With_Chain (Lim : Boolean) return Boolean is
178 begin
179 -- True if the current load operation is through a limited_with clause
180
181 if Lim then
182 return True;
183
184 -- Examine the Load_Stack to locate any previous Limited_with clause
185
186 elsif Load_Stack.Last - 1 > Load_Stack.First then
187 for U in Load_Stack.First .. Load_Stack.Last - 1 loop
188 if Load_Stack.Table (U).From_Limited_With then
189 return True;
190 end if;
191 end loop;
192 end if;
193
194 return False;
195 end From_Limited_With_Chain;
196
197 ----------------
198 -- Initialize --
199 ----------------
200
201 procedure Initialize is
202 begin
203 Units.Init;
204 Load_Stack.Init;
205 end Initialize;
206
207 ------------------------
208 -- Initialize_Version --
209 ------------------------
210
211 procedure Initialize_Version (U : Unit_Number_Type) is
212 begin
213 Units.Table (U).Version := Source_Checksum (Source_Index (U));
214 end Initialize_Version;
215
216 ----------------------
217 -- Load_Main_Source --
218 ----------------------
219
220 procedure Load_Main_Source is
221 Fname : File_Name_Type;
222
223 begin
224 Load_Stack.Increment_Last;
225 Load_Stack.Table (Load_Stack.Last) := (Main_Unit, False);
226
227 -- Initialize unit table entry for Main_Unit. Note that we don't know
228 -- the unit name yet, that gets filled in when the parser parses the
229 -- main unit, at which time a check is made that it matches the main
230 -- file name, and then the Unit_Name field is set. The Cunit and
231 -- Cunit_Entity fields also get filled in later by the parser.
232
233 Units.Increment_Last;
234 Fname := Next_Main_Source;
235
236 Units.Table (Main_Unit).Unit_File_Name := Fname;
237
238 if Fname /= No_File then
239 Main_Source_File := Load_Source_File (Fname);
240 Current_Error_Source_File := Main_Source_File;
241
242 Units.Table (Main_Unit) := (
243 Cunit => Empty,
244 Cunit_Entity => Empty,
245 Dependency_Num => 0,
246 Dynamic_Elab => False,
247 Error_Location => No_Location,
248 Expected_Unit => No_Name,
249 Fatal_Error => False,
250 Generate_Code => False,
251 Has_RACW => False,
252 Ident_String => Empty,
253 Loading => True,
254 Main_Priority => Default_Main_Priority,
255 Munit_Index => 0,
256 Serial_Number => 0,
257 Source_Index => Main_Source_File,
258 Unit_File_Name => Fname,
259 Unit_Name => No_Name,
260 Version => Source_Checksum (Main_Source_File));
261 end if;
262 end Load_Main_Source;
263
264 ---------------
265 -- Load_Unit --
266 ---------------
267
268 function Load_Unit
269 (Load_Name : Unit_Name_Type;
270 Required : Boolean;
271 Error_Node : Node_Id;
272 Subunit : Boolean;
273 Corr_Body : Unit_Number_Type := No_Unit;
274 Renamings : Boolean := False;
275 From_Limited_With : Boolean := False) return Unit_Number_Type
276 is
277 Calling_Unit : Unit_Number_Type;
278 Uname_Actual : Unit_Name_Type;
279 Unum : Unit_Number_Type;
280 Unump : Unit_Number_Type;
281 Fname : File_Name_Type;
282 Src_Ind : Source_File_Index;
283
284 -- Start of processing for Load_Unit
285
286 begin
287 -- If renamings are allowed and we have a child unit name, then we
288 -- must first load the parent to deal with finding the real name.
289
290 if Renamings and then Is_Child_Name (Load_Name) then
291 Unump :=
292 Load_Unit
293 (Load_Name => Get_Parent_Spec_Name (Load_Name),
294 Required => Required,
295 Subunit => False,
296 Renamings => True,
297 Error_Node => Error_Node);
298
299 if Unump = No_Unit then
300 return No_Unit;
301 end if;
302
303 -- If parent is a renaming, then we use the renamed package as
304 -- the actual parent for the subsequent load operation.
305
306 if Nkind (Parent (Cunit_Entity (Unump))) =
307 N_Package_Renaming_Declaration
308 then
309 Uname_Actual :=
310 New_Child
311 (Load_Name,
312 Get_Unit_Name (Name (Parent (Cunit_Entity (Unump)))));
313
314 -- Save the renaming entity, to establish its visibility when
315 -- installing the context. The implicit with is on this entity,
316 -- not on the package it renames.
317
318 if Nkind (Error_Node) = N_With_Clause
319 and then Nkind (Name (Error_Node)) = N_Selected_Component
320 then
321 declare
322 Par : Node_Id := Name (Error_Node);
323
324 begin
325 while Nkind (Par) = N_Selected_Component
326 and then Chars (Selector_Name (Par)) /=
327 Chars (Cunit_Entity (Unump))
328 loop
329 Par := Prefix (Par);
330 end loop;
331
332 -- Case of some intermediate parent is a renaming
333
334 if Nkind (Par) = N_Selected_Component then
335 Set_Entity (Selector_Name (Par), Cunit_Entity (Unump));
336
337 -- Case where the ultimate parent is a renaming
338
339 else
340 Set_Entity (Par, Cunit_Entity (Unump));
341 end if;
342 end;
343 end if;
344
345 -- If the parent is not a renaming, then get its name (this may
346 -- be different from the parent spec name obtained above because
347 -- of renamings higher up in the hierarchy).
348
349 else
350 Uname_Actual := New_Child (Load_Name, Unit_Name (Unump));
351 end if;
352
353 -- Here if unit to be loaded is not a child unit
354
355 else
356 Uname_Actual := Load_Name;
357 end if;
358
359 Fname := Get_File_Name (Uname_Actual, Subunit);
360
361 if Debug_Flag_L then
362 Write_Eol;
363 Write_Str ("*** Load request for unit: ");
364 Write_Unit_Name (Load_Name);
365
366 if Required then
367 Write_Str (" (Required = True)");
368 else
369 Write_Str (" (Required = False)");
370 end if;
371
372 Write_Eol;
373
374 if Uname_Actual /= Load_Name then
375 Write_Str ("*** Actual unit loaded: ");
376 Write_Unit_Name (Uname_Actual);
377 end if;
378 end if;
379
380 -- Capture error location if it is for the main unit. The idea is to
381 -- post errors on the main unit location, not the most recent unit.
382 -- Note: Unit_Name (Main_Unit) is not set if we are parsing gnat.adc.
383
384 if Present (Error_Node)
385 and then Unit_Name (Main_Unit) /= No_Name
386 then
387 -- It seems like In_Extended_Main_Source_Unit (Error_Node) would
388 -- do the trick here, but that's wrong, it is much too early to
389 -- call this routine. We are still in the parser, and the required
390 -- semantic information is not established yet. So we base the
391 -- judgment on unit names.
392
393 Get_External_Unit_Name_String (Unit_Name (Main_Unit));
394
395 declare
396 Main_Unit_Name : constant String := Name_Buffer (1 .. Name_Len);
397
398 begin
399 Get_External_Unit_Name_String
400 (Unit_Name (Get_Source_Unit (Error_Node)));
401
402 -- If the two names are identical, then for sure we are part
403 -- of the extended main unit
404
405 if Main_Unit_Name = Name_Buffer (1 .. Name_Len) then
406 Load_Msg_Sloc := Sloc (Error_Node);
407
408 -- If the load is called from a with_type clause, the error
409 -- node is correct.
410
411 elsif Nkind (Parent (Error_Node)) = N_With_Type_Clause then
412 Load_Msg_Sloc := Sloc (Error_Node);
413
414 -- Otherwise, check for the subunit case, and if so, consider
415 -- we have a match if one name is a prefix of the other name.
416
417 else
418 if Nkind (Unit (Cunit (Main_Unit))) = N_Subunit
419 or else
420 Nkind (Unit (Cunit (Get_Source_Unit (Error_Node)))) =
421 N_Subunit
422 then
423 Name_Len := Integer'Min (Name_Len, Main_Unit_Name'Length);
424
425 if Name_Buffer (1 .. Name_Len)
426 =
427 Main_Unit_Name (1 .. Name_Len)
428 then
429 Load_Msg_Sloc := Sloc (Error_Node);
430 end if;
431 end if;
432 end if;
433 end;
434 end if;
435
436 -- If we are generating error messages, then capture calling unit
437
438 if Present (Error_Node) then
439 Calling_Unit := Get_Source_Unit (Error_Node);
440 else
441 Calling_Unit := No_Unit;
442 end if;
443
444 -- See if we already have an entry for this unit
445
446 Unum := Main_Unit;
447
448 while Unum <= Units.Last loop
449 exit when Uname_Actual = Units.Table (Unum).Unit_Name;
450 Unum := Unum + 1;
451 end loop;
452
453 -- Whether or not the entry was found, Unum is now the right value,
454 -- since it is one more than Units.Last (i.e. the index of the new
455 -- entry we will create) in the not found case.
456
457 -- A special check is necessary in the unit not found case. If the unit
458 -- is not found, but the file in which it lives has already been loaded,
459 -- then we have the problem that the file does not contain the unit that
460 -- is needed. We simply treat this as a file not found condition.
461
462 -- We skip this test in multiple unit per file mode since in this
463 -- case we can have multiple units from the same source file.
464
465 if Unum > Units.Last and then Get_Unit_Index (Uname_Actual) = 0 then
466 for J in Units.First .. Units.Last loop
467 if Fname = Units.Table (J).Unit_File_Name then
468 if Debug_Flag_L then
469 Write_Str (" file does not contain unit, Unit_Number = ");
470 Write_Int (Int (Unum));
471 Write_Eol;
472 Write_Eol;
473 end if;
474
475 if Present (Error_Node) then
476 if Is_Predefined_File_Name (Fname) then
477 Error_Msg_Name_1 := Uname_Actual;
478 Error_Msg
479 ("% is not a language defined unit", Load_Msg_Sloc);
480 else
481 Error_Msg_Name_1 := Fname;
482 Error_Msg_Unit_1 := Uname_Actual;
483 Error_Msg
484 ("File{ does not contain unit$", Load_Msg_Sloc);
485 end if;
486
487 Write_Dependency_Chain;
488 return No_Unit;
489
490 else
491 return No_Unit;
492 end if;
493 end if;
494 end loop;
495 end if;
496
497 -- If we are proceeding with load, then make load stack entry,
498 -- and indicate the kind of with_clause responsible for the load.
499
500 Load_Stack.Increment_Last;
501 Load_Stack.Table (Load_Stack.Last) := (Unum, From_Limited_With);
502
503 -- Case of entry already in table
504
505 if Unum <= Units.Last then
506
507 -- Here is where we check for a circular dependency, which is
508 -- an attempt to load a unit which is currently in the process
509 -- of being loaded. We do *not* care about a circular chain that
510 -- leads back to a body, because this kind of circular dependence
511 -- legitimately occurs (e.g. two package bodies that contain
512 -- inlined subprogram referenced by the other).
513
514 -- Ada 2005 (AI-50217): We also ignore limited_with clauses, because
515 -- their purpose is precisely to create legal circular structures.
516
517 if Loading (Unum)
518 and then (Is_Spec_Name (Units.Table (Unum).Unit_Name)
519 or else Acts_As_Spec (Units.Table (Unum).Cunit))
520 and then (Nkind (Error_Node) /= N_With_Clause
521 or else not Limited_Present (Error_Node))
522 and then not From_Limited_With_Chain (From_Limited_With)
523 then
524 if Debug_Flag_L then
525 Write_Str (" circular dependency encountered");
526 Write_Eol;
527 end if;
528
529 if Present (Error_Node) then
530 Error_Msg ("circular unit dependency", Load_Msg_Sloc);
531 Write_Dependency_Chain;
532 else
533 Load_Stack.Decrement_Last;
534 end if;
535
536 return No_Unit;
537 end if;
538
539 if Debug_Flag_L then
540 Write_Str (" unit already in file table, Unit_Number = ");
541 Write_Int (Int (Unum));
542 Write_Eol;
543 end if;
544
545 Load_Stack.Decrement_Last;
546 return Unum;
547
548 -- Unit is not already in table, so try to open the file
549
550 else
551 if Debug_Flag_L then
552 Write_Str (" attempt unit load, Unit_Number = ");
553 Write_Int (Int (Unum));
554 Write_Eol;
555 end if;
556
557 Src_Ind := Load_Source_File (Fname);
558
559 -- Make a partial entry in the file table, used even in the file not
560 -- found case to print the dependency chain including the last entry
561
562 Units.Increment_Last;
563 Units.Table (Unum).Unit_Name := Uname_Actual;
564
565 -- File was found
566
567 if Src_Ind /= No_Source_File then
568 Units.Table (Unum) := (
569 Cunit => Empty,
570 Cunit_Entity => Empty,
571 Dependency_Num => 0,
572 Dynamic_Elab => False,
573 Error_Location => Sloc (Error_Node),
574 Expected_Unit => Uname_Actual,
575 Fatal_Error => False,
576 Generate_Code => False,
577 Has_RACW => False,
578 Ident_String => Empty,
579 Loading => True,
580 Main_Priority => Default_Main_Priority,
581 Munit_Index => 0,
582 Serial_Number => 0,
583 Source_Index => Src_Ind,
584 Unit_File_Name => Fname,
585 Unit_Name => Uname_Actual,
586 Version => Source_Checksum (Src_Ind));
587
588 -- Parse the new unit
589
590 declare
591 Save_Index : constant Nat := Multiple_Unit_Index;
592 begin
593 Multiple_Unit_Index := Get_Unit_Index (Uname_Actual);
594 Units.Table (Unum).Munit_Index := Multiple_Unit_Index;
595 Initialize_Scanner (Unum, Source_Index (Unum));
596 Discard_List (Par (Configuration_Pragmas => False,
597 From_Limited_With => From_Limited_With));
598 Multiple_Unit_Index := Save_Index;
599 Set_Loading (Unum, False);
600 end;
601
602 -- If spec is irrelevant, then post errors and quit
603
604 if Corr_Body /= No_Unit
605 and then Spec_Is_Irrelevant (Unum, Corr_Body)
606 then
607 Error_Msg_Name_1 := Unit_File_Name (Corr_Body);
608 Error_Msg
609 ("cannot compile subprogram in file {!",
610 Load_Msg_Sloc);
611 Error_Msg_Name_1 := Unit_File_Name (Unum);
612 Error_Msg
613 ("\incorrect spec in file { must be removed first!",
614 Load_Msg_Sloc);
615 return No_Unit;
616 end if;
617
618 -- If loaded unit had a fatal error, then caller inherits it!
619
620 if Units.Table (Unum).Fatal_Error
621 and then Present (Error_Node)
622 then
623 Units.Table (Calling_Unit).Fatal_Error := True;
624 end if;
625
626 -- Remove load stack entry and return the entry in the file table
627
628 Load_Stack.Decrement_Last;
629 return Unum;
630
631 -- Case of file not found
632
633 else
634 if Debug_Flag_L then
635 Write_Str (" file was not found, load failed");
636 Write_Eol;
637 end if;
638
639 -- Generate message if unit required
640
641 if Required and then Present (Error_Node) then
642 if Is_Predefined_File_Name (Fname) then
643
644 -- This is a predefined library unit which is not present
645 -- in the run time. If a predefined unit is not available
646 -- it may very likely be the case that there is also pragma
647 -- Restriction forbidding its usage. This is typically the
648 -- case when building a configurable run time, where the
649 -- usage of certain run-time units units is restricted by
650 -- means of both the corresponding pragma Restriction (such
651 -- as No_Calendar), and by not including the unit. Hence,
652 -- we check whether this predefined unit is forbidden, so
653 -- that the message about the restriction violation is
654 -- generated, if needed.
655
656 Check_Restricted_Unit (Load_Name, Error_Node);
657
658 Error_Msg_Name_1 := Uname_Actual;
659 Error_Msg
660 ("% is not a predefined library unit", Load_Msg_Sloc);
661
662 else
663 Error_Msg_Name_1 := Fname;
664 Error_Msg ("file{ not found", Load_Msg_Sloc);
665 end if;
666
667 Write_Dependency_Chain;
668
669 -- Remove unit from stack, to avoid cascaded errors on
670 -- subsequent missing files.
671
672 Load_Stack.Decrement_Last;
673 Units.Decrement_Last;
674
675 -- If unit not required, remove load stack entry and the junk
676 -- file table entry, and return No_Unit to indicate not found,
677
678 else
679 Load_Stack.Decrement_Last;
680 Units.Decrement_Last;
681 end if;
682
683 return No_Unit;
684 end if;
685 end if;
686 end Load_Unit;
687
688 ------------------------
689 -- Make_Instance_Unit --
690 ------------------------
691
692 -- If the unit is an instance, it appears as a package declaration, but
693 -- contains both declaration and body of the instance. The body becomes
694 -- the main unit of the compilation, and the declaration is inserted
695 -- at the end of the unit table. The main unit now has the name of a
696 -- body, which is constructed from the name of the original spec,
697 -- and is attached to the compilation node of the original unit. The
698 -- declaration has been attached to a new compilation unit node, and
699 -- code will have to be generated for it.
700
701 procedure Make_Instance_Unit (N : Node_Id) is
702 Sind : constant Source_File_Index := Source_Index (Main_Unit);
703 begin
704 Units.Increment_Last;
705 Units.Table (Units.Last) := Units.Table (Main_Unit);
706 Units.Table (Units.Last).Cunit := Library_Unit (N);
707 Units.Table (Units.Last).Generate_Code := True;
708 Units.Table (Main_Unit).Cunit := N;
709 Units.Table (Main_Unit).Unit_Name :=
710 Get_Body_Name (Unit_Name (Get_Cunit_Unit_Number (Library_Unit (N))));
711 Units.Table (Main_Unit).Version := Source_Checksum (Sind);
712 end Make_Instance_Unit;
713
714 ------------------------
715 -- Spec_Is_Irrelevant --
716 ------------------------
717
718 function Spec_Is_Irrelevant
719 (Spec_Unit : Unit_Number_Type;
720 Body_Unit : Unit_Number_Type) return Boolean
721 is
722 Sunit : constant Node_Id := Cunit (Spec_Unit);
723 Bunit : constant Node_Id := Cunit (Body_Unit);
724
725 begin
726 -- The spec is irrelevant if the body is a subprogram body, and the
727 -- spec is other than a subprogram spec or generic subprogram spec.
728 -- Note that the names must be the same, we don't need to check that,
729 -- because we already know that from the fact that the file names are
730 -- the same.
731
732 return
733 Nkind (Unit (Bunit)) = N_Subprogram_Body
734 and then Nkind (Unit (Sunit)) /= N_Subprogram_Declaration
735 and then Nkind (Unit (Sunit)) /= N_Generic_Subprogram_Declaration;
736 end Spec_Is_Irrelevant;
737
738 --------------------
739 -- Version_Update --
740 --------------------
741
742 procedure Version_Update (U : Node_Id; From : Node_Id) is
743 Unum : constant Unit_Number_Type := Get_Cunit_Unit_Number (U);
744 Fnum : constant Unit_Number_Type := Get_Cunit_Unit_Number (From);
745 begin
746 if Source_Index (Fnum) /= No_Source_File then
747 Units.Table (Unum).Version :=
748 Units.Table (Unum).Version
749 xor
750 Source_Checksum (Source_Index (Fnum));
751 end if;
752 end Version_Update;
753
754 ----------------------------
755 -- Write_Dependency_Chain --
756 ----------------------------
757
758 procedure Write_Dependency_Chain is
759 begin
760 -- The dependency chain is only written if it is at least two entries
761 -- deep, otherwise it is trivial (the main unit depending on a unit
762 -- that it obviously directly depends on).
763
764 if Load_Stack.Last - 1 > Load_Stack.First then
765 for U in Load_Stack.First .. Load_Stack.Last - 1 loop
766 Error_Msg_Unit_1 :=
767 Unit_Name (Load_Stack.Table (U).Unit_Number);
768 Error_Msg_Unit_2 :=
769 Unit_Name (Load_Stack.Table (U + 1).Unit_Number);
770 Error_Msg ("$ depends on $!", Load_Msg_Sloc);
771 end loop;
772 end if;
773 end Write_Dependency_Chain;
774
775 end Lib.Load;
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