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* arm.md (reload_mulsi3, reload_mulsi_compare0, reload_muladdsi)
[official-gcc.git] / gcc / ada / lib-load.adb
blob805c88f9ae039fc5d9a6e9fdaae3cdf46cb17684
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT COMPILER COMPONENTS --
4 -- --
5 -- L I B . L O A D --
6 -- --
7 -- B o d y --
8 -- --
9 -- --
10 -- Copyright (C) 1992-2001 Free Software Foundation, Inc. --
11 -- --
12 -- GNAT is free software; you can redistribute it and/or modify it under --
13 -- terms of the GNU General Public License as published by the Free Soft- --
14 -- ware Foundation; either version 2, or (at your option) any later ver- --
15 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
16 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
17 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
18 -- for more details. You should have received a copy of the GNU General --
19 -- Public License distributed with GNAT; see file COPYING. If not, write --
20 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
21 -- MA 02111-1307, USA. --
22 -- --
23 -- GNAT was originally developed by the GNAT team at New York University. --
24 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
25 -- --
26 ------------------------------------------------------------------------------
27
28 with Atree; use Atree;
29 with Debug; use Debug;
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 Scn; use Scn;
42 with Sinfo; use Sinfo;
43 with Sinput; use Sinput;
44 with Sinput.L; use Sinput.L;
45 with Targparm; use Targparm;
46 with Tbuild; use Tbuild;
47 with Uname; use Uname;
48
49 package body Lib.Load is
50
51 -----------------------
52 -- Local Subprograms --
53 -----------------------
54
55 function Spec_Is_Irrelevant
56 (Spec_Unit : Unit_Number_Type;
57 Body_Unit : Unit_Number_Type)
58 return Boolean;
59 -- The Spec_Unit and Body_Unit parameters are the unit numbers of the
60 -- spec file that corresponds to the main unit which is a body. This
61 -- function determines if the spec file is irrelevant and will be
62 -- overridden by the body as described in RM 10.1.4(4). See description
63 -- in "Special Handling of Subprogram Bodies" for further details.
64
65 procedure Write_Dependency_Chain;
66 -- This procedure is used to generate error message info lines that
67 -- trace the current dependency chain when a load error occurs.
68
69 -------------------------------
70 -- Create_Dummy_Package_Unit --
71 -------------------------------
72
73 function Create_Dummy_Package_Unit
74 (With_Node : Node_Id;
75 Spec_Name : Unit_Name_Type)
76 return Unit_Number_Type
77 is
78 Unum : Unit_Number_Type;
79 Cunit_Entity : Entity_Id;
80 Cunit : Node_Id;
81 Du_Name : Node_Or_Entity_Id;
82 End_Lab : Node_Id;
83 Save_CS : constant Boolean := Get_Comes_From_Source_Default;
84
85 begin
86 -- The created dummy package unit does not come from source
87
88 Set_Comes_From_Source_Default (False);
89
90 -- Normal package
91
92 if Nkind (Name (With_Node)) = N_Identifier then
93 Cunit_Entity :=
94 Make_Defining_Identifier (No_Location,
95 Chars => Chars (Name (With_Node)));
96 Du_Name := Cunit_Entity;
97 End_Lab := New_Occurrence_Of (Cunit_Entity, No_Location);
98
99 -- Child package
100
101 else -- Nkind (Name (With_Node)) = N_Expanded_Name
102 Cunit_Entity :=
103 Make_Defining_Identifier (No_Location,
104 Chars => Chars (Selector_Name (Name (With_Node))));
105 Du_Name :=
106 Make_Defining_Program_Unit_Name (No_Location,
107 Name => New_Copy_Tree (Prefix (Name (With_Node))),
108 Defining_Identifier => Cunit_Entity);
109 End_Lab :=
110 Make_Designator (No_Location,
111 Name => New_Copy_Tree (Prefix (Name (With_Node))),
112 Identifier => New_Occurrence_Of (Cunit_Entity, No_Location));
113 end if;
114
115 Cunit :=
116 Make_Compilation_Unit (No_Location,
117 Context_Items => Empty_List,
118 Unit =>
119 Make_Package_Declaration (No_Location,
120 Specification =>
121 Make_Package_Specification (No_Location,
122 Defining_Unit_Name => Du_Name,
123 Visible_Declarations => Empty_List,
124 End_Label => End_Lab)),
125 Aux_Decls_Node =>
126 Make_Compilation_Unit_Aux (No_Location));
127
128 Units.Increment_Last;
129 Unum := Units.Last;
130
131 Units.Table (Unum) := (
132 Cunit => Cunit,
133 Cunit_Entity => Cunit_Entity,
134 Dependency_Num => 0,
135 Dependent_Unit => False,
136 Dynamic_Elab => False,
137 Error_Location => Sloc (With_Node),
138 Expected_Unit => Spec_Name,
139 Fatal_Error => True,
140 Generate_Code => False,
141 Has_RACW => False,
142 Ident_String => Empty,
143 Loading => False,
144 Main_Priority => Default_Main_Priority,
145 Serial_Number => 0,
146 Source_Index => No_Source_File,
147 Unit_File_Name => Get_File_Name (Spec_Name, Subunit => False),
148 Unit_Name => Spec_Name,
149 Version => 0);
150
151 Set_Comes_From_Source_Default (Save_CS);
152 Set_Error_Posted (Cunit_Entity);
153 Set_Error_Posted (Cunit);
154 return Unum;
155 end Create_Dummy_Package_Unit;
156
157 ----------------
158 -- Initialize --
159 ----------------
160
161 procedure Initialize is
162 Fname : File_Name_Type;
163
164 begin
165 Units.Init;
166 Load_Stack.Init;
167 Load_Stack.Increment_Last;
168 Load_Stack.Table (Load_Stack.Last) := Main_Unit;
169
170 -- Initialize unit table entry for Main_Unit. Note that we don't know
171 -- the unit name yet, that gets filled in when the parser parses the
172 -- main unit, at which time a check is made that it matches the main
173 -- file name, and then the Unit_Name field is set. The Cunit and
174 -- Cunit_Entity fields also get filled in later by the parser.
175
176 Units.Increment_Last;
177 Fname := Next_Main_Source;
178
179 Units.Table (Main_Unit).Unit_File_Name := Fname;
180
181 if Fname /= No_File then
182
183 Main_Source_File := Load_Source_File (Fname);
184 Current_Error_Source_File := Main_Source_File;
185
186 Units.Table (Main_Unit) := (
187 Cunit => Empty,
188 Cunit_Entity => Empty,
189 Dependency_Num => 0,
190 Dependent_Unit => True,
191 Dynamic_Elab => False,
192 Error_Location => No_Location,
193 Expected_Unit => No_Name,
194 Fatal_Error => False,
195 Generate_Code => False,
196 Has_RACW => False,
197 Loading => True,
198 Ident_String => Empty,
199 Main_Priority => Default_Main_Priority,
200 Serial_Number => 0,
201 Source_Index => Main_Source_File,
202 Unit_File_Name => Fname,
203 Unit_Name => No_Name,
204 Version => Source_Checksum (Main_Source_File));
205 end if;
206 end Initialize;
207
208 ------------------------
209 -- Initialize_Version --
210 ------------------------
211
212 procedure Initialize_Version (U : Unit_Number_Type) is
213 begin
214 Units.Table (U).Version := Source_Checksum (Source_Index (U));
215 end Initialize_Version;
216
217 ---------------
218 -- Load_Unit --
219 ---------------
220
221 function Load_Unit
222 (Load_Name : Unit_Name_Type;
223 Required : Boolean;
224 Error_Node : Node_Id;
225 Subunit : Boolean;
226 Corr_Body : Unit_Number_Type := No_Unit;
227 Renamings : Boolean := False)
228 return Unit_Number_Type
229 is
230 Calling_Unit : Unit_Number_Type;
231 Uname_Actual : Unit_Name_Type;
232 Unum : Unit_Number_Type;
233 Unump : Unit_Number_Type;
234 Fname : File_Name_Type;
235 Src_Ind : Source_File_Index;
236 Discard : List_Id;
237
238 procedure Set_Load_Unit_Dependency (U : Unit_Number_Type);
239 -- Sets the Dependent_Unit flag unless we have a predefined unit
240 -- being loaded in No_Run_Time mode. In this case we do not want
241 -- to create a dependency, since we have loaded the unit only
242 -- to inline stuff from it. If this is not the case, an error
243 -- message will be issued in Rtsfind in any case.
244
245 ------------------------------
246 -- Set_Load_Unit_Dependency --
247 ------------------------------
248
249 procedure Set_Load_Unit_Dependency (U : Unit_Number_Type) is
250 begin
251 -- Differentiate between pragma No_Run_Time (that can be used
252 -- with a standard installation), and HI-E mode which comes
253 -- with a special installation.
254 --
255 -- For No_Run_Time mode, we do not want to create a dependency
256 -- since the binder would generate references to these units.
257 -- In the case of HI-E, a special run time is provided that do
258 -- not have any elaboration, so it is safe (and useful) to add
259 -- the dependency. In particular, this allows the user to
260 -- recompile run time units, e.g GNAT.IO.
261
262 if No_Run_Time
263 and then not High_Integrity_Mode_On_Target
264 and then Is_Internal_File_Name (Unit_File_Name (U))
265 then
266 null;
267 else
268 Units.Table (U).Dependent_Unit := True;
269 end if;
270 end Set_Load_Unit_Dependency;
271
272 -- Start of processing for Load_Unit
273
274 begin
275 -- If renamings are allowed and we have a child unit name, then we
276 -- must first load the parent to deal with finding the real name.
277
278 if Renamings and then Is_Child_Name (Load_Name) then
279 Unump :=
280 Load_Unit
281 (Load_Name => Get_Parent_Spec_Name (Load_Name),
282 Required => Required,
283 Subunit => False,
284 Renamings => True,
285 Error_Node => Error_Node);
286
287 if Unump = No_Unit then
288 return No_Unit;
289 end if;
290
291 -- If parent is a renaming, then we use the renamed package as
292 -- the actual parent for the subsequent load operation.
293
294 if Nkind (Parent (Cunit_Entity (Unump))) =
295 N_Package_Renaming_Declaration
296 then
297 Uname_Actual :=
298 New_Child
299 (Load_Name,
300 Get_Unit_Name (Name (Parent (Cunit_Entity (Unump)))));
301
302 -- Save the renaming entity, to establish its visibility when
303 -- installing the context. The implicit with is on this entity,
304 -- not on the package it renames.
305
306 if Nkind (Error_Node) = N_With_Clause
307 and then Nkind (Name (Error_Node)) = N_Selected_Component
308 then
309 declare
310 Par : Node_Id := Name (Error_Node);
311
312 begin
313 while Nkind (Par) = N_Selected_Component
314 and then Chars (Selector_Name (Par)) /=
315 Chars (Cunit_Entity (Unump))
316 loop
317 Par := Prefix (Par);
318 end loop;
319
320 if Nkind (Par) = N_Selected_Component then
321 -- some intermediate parent is a renaming.
322
323 Set_Entity (Selector_Name (Par), Cunit_Entity (Unump));
324
325 else
326 -- the ultimate parent is a renaming.
327
328 Set_Entity (Par, Cunit_Entity (Unump));
329 end if;
330 end;
331 end if;
332
333 -- If the parent is not a renaming, then get its name (this may
334 -- be different from the parent spec name obtained above because
335 -- of renamings higher up in the hierarchy).
336
337 else
338 Uname_Actual := New_Child (Load_Name, Unit_Name (Unump));
339 end if;
340
341 -- Here if unit to be loaded is not a child unit
342
343 else
344 Uname_Actual := Load_Name;
345 end if;
346
347 Fname := Get_File_Name (Uname_Actual, Subunit);
348
349 if Debug_Flag_L then
350 Write_Eol;
351 Write_Str ("*** Load request for unit: ");
352 Write_Unit_Name (Load_Name);
353
354 if Required then
355 Write_Str (" (Required = True)");
356 else
357 Write_Str (" (Required = False)");
358 end if;
359
360 Write_Eol;
361
362 if Uname_Actual /= Load_Name then
363 Write_Str ("*** Actual unit loaded: ");
364 Write_Unit_Name (Uname_Actual);
365 end if;
366 end if;
367
368 -- Capture error location if it is for the main unit. The idea is to
369 -- post errors on the main unit location, not the most recent unit.
370
371 if Present (Error_Node) then
372
373 -- It seems like In_Extended_Main_Source_Unit (Error_Node) would
374 -- do the trick here, but that's wrong, it is much too early to
375 -- call this routine. We are still in the parser, and the required
376 -- semantic information is not established yet. So we base the
377 -- judgment on unit names.
378
379 Get_External_Unit_Name_String (Unit_Name (Main_Unit));
380
381 declare
382 Main_Unit_Name : constant String := Name_Buffer (1 .. Name_Len);
383
384 begin
385 Get_External_Unit_Name_String
386 (Unit_Name (Get_Source_Unit (Error_Node)));
387
388 -- If the two names are identical, then for sure we are part
389 -- of the extended main unit
390
391 if Main_Unit_Name = Name_Buffer (1 .. Name_Len) then
392 Load_Msg_Sloc := Sloc (Error_Node);
393
394 -- If the load is called from a with_type clause, the error
395 -- node is correct.
396
397 elsif Nkind (Parent (Error_Node)) = N_With_Type_Clause then
398 Load_Msg_Sloc := Sloc (Error_Node);
399
400 -- Otherwise, check for the subunit case, and if so, consider
401 -- we have a match if one name is a prefix of the other name.
402
403 else
404 if Nkind (Unit (Cunit (Main_Unit))) = N_Subunit
405 or else
406 Nkind (Unit (Cunit (Get_Source_Unit (Error_Node)))) =
407 N_Subunit
408 then
409 Name_Len := Integer'Min (Name_Len, Main_Unit_Name'Length);
410
411 if Name_Buffer (1 .. Name_Len)
412 =
413 Main_Unit_Name (1 .. Name_Len)
414 then
415 Load_Msg_Sloc := Sloc (Error_Node);
416 end if;
417 end if;
418 end if;
419 end;
420 end if;
421
422 -- If we are generating error messages, then capture calling unit
423
424 if Present (Error_Node) then
425 Calling_Unit := Get_Source_Unit (Error_Node);
426 else
427 Calling_Unit := No_Unit;
428 end if;
429
430 -- See if we already have an entry for this unit
431
432 Unum := Main_Unit;
433
434 while Unum <= Units.Last loop
435 exit when Uname_Actual = Units.Table (Unum).Unit_Name;
436 Unum := Unum + 1;
437 end loop;
438
439 -- Whether or not the entry was found, Unum is now the right value,
440 -- since it is one more than Units.Last (i.e. the index of the new
441 -- entry we will create) in the not found case.
442
443 -- A special check is necessary in the unit not found case. If the unit
444 -- is not found, but the file in which it lives has already been loaded,
445 -- then we have the problem that the file does not contain the unit that
446 -- is needed. We simply treat this as a file not found condition.
447
448 if Unum > Units.Last then
449 for J in Units.First .. Units.Last loop
450 if Fname = Units.Table (J).Unit_File_Name then
451 if Debug_Flag_L then
452 Write_Str (" file does not contain unit, Unit_Number = ");
453 Write_Int (Int (Unum));
454 Write_Eol;
455 Write_Eol;
456 end if;
457
458 if Present (Error_Node) then
459
460 if Is_Predefined_File_Name (Fname) then
461 Error_Msg_Name_1 := Uname_Actual;
462 Error_Msg
463 ("% is not a language defined unit", Load_Msg_Sloc);
464 else
465 Error_Msg_Name_1 := Fname;
466 Error_Msg_Unit_1 := Uname_Actual;
467 Error_Msg
468 ("File{ does not contain unit$", Load_Msg_Sloc);
469 end if;
470
471 Write_Dependency_Chain;
472 return No_Unit;
473
474 else
475 return No_Unit;
476 end if;
477 end if;
478 end loop;
479 end if;
480
481 -- If we are proceeding with load, then make load stack entry
482
483 Load_Stack.Increment_Last;
484 Load_Stack.Table (Load_Stack.Last) := Unum;
485
486 -- Case of entry already in table
487
488 if Unum <= Units.Last then
489
490 -- Here is where we check for a circular dependency, which is
491 -- an attempt to load a unit which is currently in the process
492 -- of being loaded. We do *not* care about a circular chain that
493 -- leads back to a body, because this kind of circular dependence
494 -- legitimately occurs (e.g. two package bodies that contain
495 -- inlined subprogram referenced by the other).
496
497 if Loading (Unum)
498 and then (Is_Spec_Name (Units.Table (Unum).Unit_Name)
499 or else Acts_As_Spec (Units.Table (Unum).Cunit))
500 then
501 if Debug_Flag_L then
502 Write_Str (" circular dependency encountered");
503 Write_Eol;
504 end if;
505
506 if Present (Error_Node) then
507 Error_Msg ("circular unit dependency", Load_Msg_Sloc);
508 Write_Dependency_Chain;
509 else
510 Load_Stack.Decrement_Last;
511 end if;
512
513 return No_Unit;
514 end if;
515
516 if Debug_Flag_L then
517 Write_Str (" unit already in file table, Unit_Number = ");
518 Write_Int (Int (Unum));
519 Write_Eol;
520 end if;
521
522 Load_Stack.Decrement_Last;
523 Set_Load_Unit_Dependency (Unum);
524 return Unum;
525
526 -- File is not already in table, so try to open it
527
528 else
529 if Debug_Flag_L then
530 Write_Str (" attempt unit load, Unit_Number = ");
531 Write_Int (Int (Unum));
532 Write_Eol;
533 end if;
534
535 Src_Ind := Load_Source_File (Fname);
536
537 -- Make a partial entry in the file table, used even in the file not
538 -- found case to print the dependency chain including the last entry
539
540 Units.Increment_Last;
541 Units.Table (Unum).Unit_Name := Uname_Actual;
542
543 -- File was found
544
545 if Src_Ind /= No_Source_File then
546 Units.Table (Unum) := (
547 Cunit => Empty,
548 Cunit_Entity => Empty,
549 Dependency_Num => 0,
550 Dependent_Unit => False,
551 Dynamic_Elab => False,
552 Error_Location => Sloc (Error_Node),
553 Expected_Unit => Uname_Actual,
554 Fatal_Error => False,
555 Generate_Code => False,
556 Has_RACW => False,
557 Ident_String => Empty,
558 Loading => True,
559 Main_Priority => Default_Main_Priority,
560 Serial_Number => 0,
561 Source_Index => Src_Ind,
562 Unit_File_Name => Fname,
563 Unit_Name => Uname_Actual,
564 Version => Source_Checksum (Src_Ind));
565
566 -- Parse the new unit
567
568 Initialize_Scanner (Unum, Source_Index (Unum));
569 Discard := Par (Configuration_Pragmas => False);
570 Set_Loading (Unum, False);
571
572 -- If spec is irrelevant, then post errors and quit
573
574 if Corr_Body /= No_Unit
575 and then Spec_Is_Irrelevant (Unum, Corr_Body)
576 then
577 Error_Msg_Name_1 := Unit_File_Name (Corr_Body);
578 Error_Msg
579 ("cannot compile subprogram in file {!",
580 Load_Msg_Sloc);
581 Error_Msg_Name_1 := Unit_File_Name (Unum);
582 Error_Msg
583 ("incorrect spec in file { must be removed first!",
584 Load_Msg_Sloc);
585 return No_Unit;
586 end if;
587
588 -- If loaded unit had a fatal error, then caller inherits it!
589
590 if Units.Table (Unum).Fatal_Error
591 and then Present (Error_Node)
592 then
593 Units.Table (Calling_Unit).Fatal_Error := True;
594 end if;
595
596 -- Remove load stack entry and return the entry in the file table
597
598 Load_Stack.Decrement_Last;
599 Set_Load_Unit_Dependency (Unum);
600 return Unum;
601
602 -- Case of file not found
603
604 else
605 if Debug_Flag_L then
606 Write_Str (" file was not found, load failed");
607 Write_Eol;
608 end if;
609
610 -- Generate message if unit required
611
612 if Required and then Present (Error_Node) then
613
614 if Is_Predefined_File_Name (Fname) then
615 Error_Msg_Name_1 := Uname_Actual;
616 Error_Msg
617 ("% is not a predefined library unit", Load_Msg_Sloc);
618
619 else
620 Error_Msg_Name_1 := Fname;
621 Error_Msg ("file{ not found", Load_Msg_Sloc);
622 end if;
623
624 Write_Dependency_Chain;
625
626 -- Remove unit from stack, to avoid cascaded errors on
627 -- subsequent missing files.
628
629 Load_Stack.Decrement_Last;
630 Units.Decrement_Last;
631
632 -- If unit not required, remove load stack entry and the junk
633 -- file table entry, and return No_Unit to indicate not found,
634
635 else
636 Load_Stack.Decrement_Last;
637 Units.Decrement_Last;
638 end if;
639
640 return No_Unit;
641 end if;
642 end if;
643 end Load_Unit;
644
645 ------------------------
646 -- Make_Instance_Unit --
647 ------------------------
648
649 -- If the unit is an instance, it appears as a package declaration, but
650 -- contains both declaration and body of the instance. The body becomes
651 -- the main unit of the compilation, and the declaration is inserted
652 -- at the end of the unit table. The main unit now has the name of a
653 -- body, which is constructed from the name of the original spec,
654 -- and is attached to the compilation node of the original unit. The
655 -- declaration has been attached to a new compilation unit node, and
656 -- code will have to be generated for it.
657
658 procedure Make_Instance_Unit (N : Node_Id) is
659 Sind : constant Source_File_Index := Source_Index (Main_Unit);
660
661 begin
662 Units.Increment_Last;
663
664 Units.Table (Units.Last) := Units.Table (Main_Unit);
665 Units.Table (Units.Last).Cunit := Library_Unit (N);
666 Units.Table (Units.Last).Generate_Code := True;
667
668 Units.Table (Main_Unit).Cunit := N;
669 Units.Table (Main_Unit).Unit_Name :=
670 Get_Body_Name (Unit_Name (Get_Cunit_Unit_Number (Library_Unit (N))));
671 Units.Table (Main_Unit).Version := Source_Checksum (Sind);
672 end Make_Instance_Unit;
673
674 ------------------------
675 -- Spec_Is_Irrelevant --
676 ------------------------
677
678 function Spec_Is_Irrelevant
679 (Spec_Unit : Unit_Number_Type;
680 Body_Unit : Unit_Number_Type)
681 return Boolean
682 is
683 Sunit : constant Node_Id := Cunit (Spec_Unit);
684 Bunit : constant Node_Id := Cunit (Body_Unit);
685
686 begin
687 -- The spec is irrelevant if the body is a subprogram body, and the
688 -- spec is other than a subprogram spec or generic subprogram spec.
689 -- Note that the names must be the same, we don't need to check that,
690 -- because we already know that from the fact that the file names are
691 -- the same.
692
693 return
694 Nkind (Unit (Bunit)) = N_Subprogram_Body
695 and then Nkind (Unit (Sunit)) /= N_Subprogram_Declaration
696 and then Nkind (Unit (Sunit)) /= N_Generic_Subprogram_Declaration;
697
698 end Spec_Is_Irrelevant;
699
700 --------------------
701 -- Version_Update --
702 --------------------
703
704 procedure Version_Update (U : Node_Id; From : Node_Id) is
705 Unum : constant Unit_Number_Type := Get_Cunit_Unit_Number (U);
706 Fnum : constant Unit_Number_Type := Get_Cunit_Unit_Number (From);
707
708 begin
709 Units.Table (Unum).Version :=
710 Units.Table (Unum).Version
711 xor
712 Source_Checksum (Source_Index (Fnum));
713 end Version_Update;
714
715 ----------------------------
716 -- Write_Dependency_Chain --
717 ----------------------------
718
719 procedure Write_Dependency_Chain is
720 begin
721 -- The dependency chain is only written if it is at least two entries
722 -- deep, otherwise it is trivial (the main unit depending on a unit
723 -- that it obviously directly depends on).
724
725 if Load_Stack.Last - 1 > Load_Stack.First then
726 for U in Load_Stack.First .. Load_Stack.Last - 1 loop
727 Error_Msg_Unit_1 := Unit_Name (Load_Stack.Table (U));
728 Error_Msg_Unit_2 := Unit_Name (Load_Stack.Table (U + 1));
729 Error_Msg ("$ depends on $!", Load_Msg_Sloc);
730 end loop;
731 end if;
732 end Write_Dependency_Chain;
733
734 end Lib.Load;
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