1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2022, Free Software Foundation, Inc. --
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. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Atree
; use Atree
;
27 with Debug
; use Debug
;
28 with Einfo
; use Einfo
;
29 with Einfo
.Entities
; use Einfo
.Entities
;
30 with Errout
; use Errout
;
31 with Fname
; use Fname
;
32 with Fname
.UF
; use Fname
.UF
;
33 with Nlists
; use Nlists
;
34 with Nmake
; use Nmake
;
36 with Osint
; use Osint
;
37 with Osint
.C
; use Osint
.C
;
38 with Output
; use Output
;
40 with Restrict
; use Restrict
;
42 with Sinfo
; use Sinfo
;
43 with Sinfo
.Nodes
; use Sinfo
.Nodes
;
44 with Sinfo
.Utils
; use Sinfo
.Utils
;
45 with Sinput
; use Sinput
;
46 with Sinput
.L
; use Sinput
.L
;
47 with Stand
; use Stand
;
48 with Tbuild
; use Tbuild
;
49 with Uname
; use Uname
;
51 package body Lib
.Load
is
53 -----------------------
54 -- Local Subprograms --
55 -----------------------
57 function From_Limited_With_Chain
return Boolean;
58 -- Check whether a possible circular dependence includes units that
59 -- have been loaded through limited_with clauses, in which case there
60 -- is no real circularity.
62 function Spec_Is_Irrelevant
63 (Spec_Unit
: Unit_Number_Type
;
64 Body_Unit
: Unit_Number_Type
) return Boolean;
65 -- The Spec_Unit and Body_Unit parameters are the unit numbers of the
66 -- spec file that corresponds to the main unit which is a body. This
67 -- function determines if the spec file is irrelevant and will be
68 -- overridden by the body as described in RM 10.1.4(4). See description
69 -- in "Special Handling of Subprogram Bodies" for further details.
71 procedure Write_Dependency_Chain
;
72 -- This procedure is used to generate error message info lines that
73 -- trace the current dependency chain when a load error occurs.
75 ------------------------------
76 -- Change_Main_Unit_To_Spec --
77 ------------------------------
79 procedure Change_Main_Unit_To_Spec
is
80 U
: Unit_Record
renames Units
.Table
(Main_Unit
);
82 X
: Source_File_Index
;
85 -- Get name of unit body
87 Get_Name_String
(U
.Unit_File_Name
);
89 -- Note: for the following we should really generalize and consult the
90 -- file name pattern data, but for now we just deal with the common
91 -- naming cases, which is good enough in practice.
93 -- Change .adb to .ads
96 and then Name_Buffer
(Name_Len
- 3 .. Name_Len
) = ".adb"
98 Name_Buffer
(Name_Len
) := 's';
100 -- Change .2.ada to .1.ada (Rational convention)
103 and then Name_Buffer
(Name_Len
- 5 .. Name_Len
) = ".2.ada"
105 Name_Buffer
(Name_Len
- 4) := '1';
107 -- Change .ada to _.ada (DEC convention)
110 and then Name_Buffer
(Name_Len
- 3 .. Name_Len
) = ".ada"
112 Name_Buffer
(Name_Len
- 3 .. Name_Len
+ 1) := "_.ada";
113 Name_Len
:= Name_Len
+ 1;
115 -- No match, don't make the change
121 -- Try loading the spec
124 X
:= Load_Source_File
(N
);
126 -- No change if we did not find the spec
128 if X
<= No_Source_File
then
132 -- Otherwise modify Main_Unit entry to point to spec
134 U
.Unit_File_Name
:= N
;
136 end Change_Main_Unit_To_Spec
;
138 -------------------------------
139 -- Create_Dummy_Package_Unit --
140 -------------------------------
142 function Create_Dummy_Package_Unit
143 (With_Node
: Node_Id
;
144 Spec_Name
: Unit_Name_Type
) return Unit_Number_Type
146 Unum
: Unit_Number_Type
;
147 Cunit_Entity
: Entity_Id
;
149 Du_Name
: Node_Or_Entity_Id
;
151 Fname
: constant File_Name_Type
:=
152 Get_File_Name
(Spec_Name
, Subunit
=> False);
153 Pre_Name
: constant Boolean :=
154 Is_Predefined_File_Name
(Fname
, Renamings_Included
=> False);
155 Ren_Name
: constant Boolean :=
156 Is_Predefined_Renaming_File_Name
(Fname
);
157 GNAT_Name
: constant Boolean :=
158 Is_GNAT_File_Name
(Fname
);
159 Save_CS
: constant Boolean := Get_Comes_From_Source_Default
;
162 -- The created dummy package unit does not come from source
164 Set_Comes_From_Source_Default
(False);
168 if Nkind
(Name
(With_Node
)) = N_Identifier
then
170 Make_Defining_Identifier
(No_Location
,
171 Chars
=> Chars
(Name
(With_Node
)));
172 Du_Name
:= Cunit_Entity
;
173 End_Lab
:= New_Occurrence_Of
(Cunit_Entity
, No_Location
);
179 Make_Defining_Identifier
(No_Location
,
180 Chars
=> Chars
(Selector_Name
(Name
(With_Node
))));
182 Make_Defining_Program_Unit_Name
(No_Location
,
183 Name
=> Copy_Separate_Tree
(Prefix
(Name
(With_Node
))),
184 Defining_Identifier
=> Cunit_Entity
);
186 Set_Is_Child_Unit
(Cunit_Entity
);
189 Make_Designator
(No_Location
,
190 Name
=> Copy_Separate_Tree
(Prefix
(Name
(With_Node
))),
191 Identifier
=> New_Occurrence_Of
(Cunit_Entity
, No_Location
));
194 Set_Scope
(Cunit_Entity
, Standard_Standard
);
197 Make_Compilation_Unit
(No_Location
,
198 Context_Items
=> Empty_List
,
200 Make_Package_Declaration
(No_Location
,
202 Make_Package_Specification
(No_Location
,
203 Defining_Unit_Name
=> Du_Name
,
204 Visible_Declarations
=> Empty_List
,
205 End_Label
=> End_Lab
)),
207 Make_Compilation_Unit_Aux
(No_Location
));
209 -- Mark the dummy package as analyzed to prevent analysis of this
210 -- (non-existent) unit in -gnatQ mode because at the moment the
211 -- structure and attributes of this dummy package does not allow
212 -- a normal analysis of this unit
214 Set_Analyzed
(Cunit
);
216 Units
.Increment_Last
;
219 Units
.Table
(Unum
) :=
221 Cunit_Entity
=> Cunit_Entity
,
223 Dynamic_Elab
=> False,
224 Error_Location
=> Sloc
(With_Node
),
225 Expected_Unit
=> Spec_Name
,
226 Fatal_Error
=> Error_Detected
,
227 Generate_Code
=> False,
230 Ident_String
=> Empty
,
232 Is_Predefined_Renaming
=> Ren_Name
,
233 Is_Predefined_Unit
=> Pre_Name
or Ren_Name
,
234 Is_Internal_Unit
=> Pre_Name
or Ren_Name
or GNAT_Name
,
238 Main_Priority
=> Default_Main_Priority
,
239 Main_CPU
=> Default_Main_CPU
,
240 Primary_Stack_Count
=> 0,
241 Sec_Stack_Count
=> 0,
243 No_Elab_Code_All
=> False,
245 Source_Index
=> No_Source_File
,
246 Unit_File_Name
=> Fname
,
247 Unit_Name
=> Spec_Name
,
251 Init_Unit_Name
(Unum
, Spec_Name
);
253 Set_Comes_From_Source_Default
(Save_CS
);
254 Set_Error_Posted
(Cunit_Entity
);
255 Set_Error_Posted
(Cunit
);
257 end Create_Dummy_Package_Unit
;
259 -----------------------------
260 -- From_Limited_With_Chain --
261 -----------------------------
263 function From_Limited_With_Chain
return Boolean is
264 Curr_Num
: constant Unit_Number_Type
:=
265 Load_Stack
.Table
(Load_Stack
.Last
).Unit_Number
;
268 -- True if the current load operation is through a limited_with clause
269 -- and we are not within a loop of regular with_clauses.
271 for U
in reverse Load_Stack
.First
.. Load_Stack
.Last
- 1 loop
272 if Load_Stack
.Table
(U
).Unit_Number
= Curr_Num
then
275 elsif Present
(Load_Stack
.Table
(U
).With_Node
)
276 and then Limited_Present
(Load_Stack
.Table
(U
).With_Node
)
283 end From_Limited_With_Chain
;
289 procedure Initialize
is
295 ------------------------
296 -- Initialize_Version --
297 ------------------------
299 procedure Initialize_Version
(U
: Unit_Number_Type
) is
301 Units
.Table
(U
).Version
:= Source_Checksum
(Source_Index
(U
));
302 end Initialize_Version
;
304 ----------------------
305 -- Load_Main_Source --
306 ----------------------
308 procedure Load_Main_Source
is
309 Fname
: constant File_Name_Type
:= Next_Main_Source
;
310 Pre_Name
: constant Boolean :=
311 Is_Predefined_File_Name
(Fname
, Renamings_Included
=> False);
312 Ren_Name
: constant Boolean :=
313 Is_Predefined_Renaming_File_Name
(Fname
);
314 GNAT_Name
: constant Boolean :=
315 Is_GNAT_File_Name
(Fname
);
319 Load_Stack
.Increment_Last
;
320 Load_Stack
.Table
(Load_Stack
.Last
) := (Main_Unit
, Empty
);
322 -- Initialize unit table entry for Main_Unit. Note that we don't know
323 -- the unit name yet, that gets filled in when the parser parses the
324 -- main unit, at which time a check is made that it matches the main
325 -- file name, and then the Unit_Name field is set. The Cunit and
326 -- Cunit_Entity fields also get filled in later by the parser.
328 Units
.Increment_Last
;
330 Units
.Table
(Main_Unit
).Unit_File_Name
:= Fname
;
332 if Fname
/= No_File
then
333 Main_Source_File
:= Load_Source_File
(Fname
);
334 Current_Error_Source_File
:= Main_Source_File
;
336 if Main_Source_File
> No_Source_File
then
337 Version
:= Source_Checksum
(Main_Source_File
);
340 -- To avoid emitting a source location (since there is no file),
341 -- we write a custom error message instead of using the machinery
346 if Main_Source_File
= No_Access_To_Source_File
then
348 ("no read access for file """ & Get_Name_String
(Fname
)
352 ("file """ & Get_Name_String
(Fname
) & """ not found");
359 Units
.Table
(Main_Unit
) :=
361 Cunit_Entity
=> Empty
,
363 Dynamic_Elab
=> False,
364 Error_Location
=> No_Location
,
365 Expected_Unit
=> No_Unit_Name
,
367 Generate_Code
=> True,
370 Ident_String
=> Empty
,
372 Is_Predefined_Renaming
=> Ren_Name
,
373 Is_Predefined_Unit
=> Pre_Name
or Ren_Name
,
374 Is_Internal_Unit
=> Pre_Name
or Ren_Name
or GNAT_Name
,
378 Main_Priority
=> Default_Main_Priority
,
379 Main_CPU
=> Default_Main_CPU
,
380 Primary_Stack_Count
=> 0,
381 Sec_Stack_Count
=> 0,
384 No_Elab_Code_All
=> False,
386 Source_Index
=> Main_Source_File
,
387 Unit_File_Name
=> Fname
,
388 Unit_Name
=> No_Unit_Name
,
392 end Load_Main_Source
;
399 (Load_Name
: Unit_Name_Type
;
401 Error_Node
: Node_Id
;
403 Corr_Body
: Unit_Number_Type
:= No_Unit
;
404 Renamings
: Boolean := False;
405 With_Node
: Node_Id
:= Empty
;
406 PMES
: Boolean := False) return Unit_Number_Type
408 Calling_Unit
: Unit_Number_Type
;
409 Uname_Actual
: Unit_Name_Type
;
410 Unum
: Unit_Number_Type
;
411 Unump
: Unit_Number_Type
;
412 Fname
: File_Name_Type
;
416 Src_Ind
: Source_File_Index
;
417 Save_PMES
: constant Boolean := Parsing_Main_Extended_Source
;
419 Save_Cunit_Restrictions
: constant Save_Cunit_Boolean_Restrictions
:=
420 Cunit_Boolean_Restrictions_Save
;
421 -- Save current restrictions for restore at end
424 Parsing_Main_Extended_Source
:= PMES
;
426 -- Initialize restrictions to config restrictions for unit to load if
427 -- it is part of the main extended source, otherwise reset them.
429 -- Note: it's a bit odd but PMES is False for subunits, which is why
430 -- we have the OR here.
432 if PMES
or Subunit
then
433 Restore_Config_Cunit_Boolean_Restrictions
;
435 Reset_Cunit_Boolean_Restrictions
;
438 -- If renamings are allowed and we have a child unit name, then we
439 -- must first load the parent to deal with finding the real name.
440 -- Retain the with_clause that names the child, so that if it is
441 -- limited, the parent is loaded under the same condition.
443 if Renamings
and then Is_Child_Name
(Load_Name
) then
446 (Load_Name
=> Get_Parent_Spec_Name
(Load_Name
),
447 Required
=> Required
,
450 Error_Node
=> Error_Node
,
451 With_Node
=> With_Node
);
453 if Unump
= No_Unit
then
458 -- If parent is a renaming, then we use the renamed package as
459 -- the actual parent for the subsequent load operation.
461 if Nkind
(Unit
(Cunit
(Unump
))) = N_Package_Renaming_Declaration
then
464 (Load_Name
, Get_Unit_Name
(Name
(Unit
(Cunit
(Unump
)))));
466 -- If the load is for a with_clause, for visibility purposes both
467 -- the renamed entity and renaming one must be available in the
468 -- current unit: the renamed one in order to retrieve the child
469 -- unit, and the original one because it may be used as a prefix
470 -- in the body of the current unit. We add an explicit with_clause
471 -- for the original parent so that the renaming declaration is
472 -- properly loaded and analyzed.
474 if Present
(With_Node
) then
475 Insert_After
(With_Node
,
476 Make_With_Clause
(Sloc
(With_Node
),
477 Name
=> Copy_Separate_Tree
(Prefix
(Name
(With_Node
)))));
480 -- Save the renaming entity, to establish its visibility when
481 -- installing the context. The implicit with is on this entity,
482 -- not on the package it renames. This is somewhat redundant given
483 -- the with_clause just created, but it simplifies subsequent
484 -- expansion of the current with_clause.
486 if Nkind
(Error_Node
) = N_With_Clause
487 and then Nkind
(Name
(Error_Node
)) = N_Selected_Component
490 Par
: Node_Id
:= Name
(Error_Node
);
493 while Nkind
(Par
) = N_Selected_Component
494 and then Chars
(Selector_Name
(Par
)) /=
495 Chars
(Cunit_Entity
(Unump
))
500 -- Case of some intermediate parent is a renaming
502 if Nkind
(Par
) = N_Selected_Component
then
503 Set_Entity
(Selector_Name
(Par
), Cunit_Entity
(Unump
));
505 -- Case where the ultimate parent is a renaming
508 Set_Entity
(Par
, Cunit_Entity
(Unump
));
513 -- If the parent is not a renaming, then get its name (this may
514 -- be different from the parent spec name obtained above because
515 -- of renamings higher up in the hierarchy).
518 Uname_Actual
:= New_Child
(Load_Name
, Unit_Name
(Unump
));
521 -- Here if unit to be loaded is not a child unit
524 Uname_Actual
:= Load_Name
;
527 Fname
:= Get_File_Name
(Uname_Actual
, Subunit
);
529 Is_Predefined_File_Name
(Fname
, Renamings_Included
=> False);
530 Ren_Name
:= Is_Predefined_Renaming_File_Name
(Fname
);
531 GNAT_Name
:= Is_GNAT_File_Name
(Fname
);
535 Write_Str
("*** Load request for unit: ");
536 Write_Unit_Name
(Load_Name
);
539 Write_Str
(" (Required = True)");
541 Write_Str
(" (Required = False)");
546 if Uname_Actual
/= Load_Name
then
547 Write_Str
("*** Actual unit loaded: ");
548 Write_Unit_Name
(Uname_Actual
);
552 -- Capture error location if it is for the main unit. The idea is to
553 -- post errors on the main unit location, not the most recent unit.
554 -- Note: Unit_Name (Main_Unit) is not set if we are parsing gnat.adc.
556 if Present
(Error_Node
)
557 and then Present
(Unit_Name
(Main_Unit
))
559 -- It seems like In_Extended_Main_Source_Unit (Error_Node) would
560 -- do the trick here, but that's wrong, it is much too early to
561 -- call this routine. We are still in the parser, and the required
562 -- semantic information is not established yet. So we base the
563 -- judgment on unit names.
565 Get_External_Unit_Name_String
(Unit_Name
(Main_Unit
));
568 Main_Unit_Name
: constant String := Name_Buffer
(1 .. Name_Len
);
571 Get_External_Unit_Name_String
572 (Unit_Name
(Get_Source_Unit
(Error_Node
)));
574 -- If the two names are identical, then for sure we are part
575 -- of the extended main unit
577 if Main_Unit_Name
= Name_Buffer
(1 .. Name_Len
) then
578 Load_Msg_Sloc
:= Sloc
(Error_Node
);
580 -- If the load is called from a with_type clause, the error
583 -- Otherwise, check for the subunit case, and if so, consider
584 -- we have a match if one name is a prefix of the other name.
587 if Nkind
(Unit
(Cunit
(Main_Unit
))) = N_Subunit
589 Nkind
(Unit
(Cunit
(Get_Source_Unit
(Error_Node
)))) =
592 Name_Len
:= Integer'Min (Name_Len
, Main_Unit_Name
'Length);
594 if Name_Buffer
(1 .. Name_Len
)
596 Main_Unit_Name
(1 .. Name_Len
)
598 Load_Msg_Sloc
:= Sloc
(Error_Node
);
605 -- If we are generating error messages, then capture calling unit
607 if Present
(Error_Node
) then
608 Calling_Unit
:= Get_Source_Unit
(Error_Node
);
610 Calling_Unit
:= No_Unit
;
613 -- See if we already have an entry for this unit
615 Unum
:= Unit_Names
.Get
(Uname_Actual
);
616 if Unum
= No_Unit
then
617 Unum
:= Units
.Last
+ 1;
620 -- Whether or not the entry was found, Unum is now the right value,
621 -- since it is one more than Units.Last (i.e. the index of the new
622 -- entry we will create) in the not found case.
624 -- A special check is necessary in the unit not found case. If the unit
625 -- is not found, but the file in which it lives has already been loaded,
626 -- then we have the problem that the file does not contain the unit that
627 -- is needed. We simply treat this as a file not found condition.
629 -- We skip this test in multiple unit per file mode since in this
630 -- case we can have multiple units from the same source file.
632 if Unum
> Units
.Last
and then Get_Unit_Index
(Uname_Actual
) = 0 then
633 for J
in Units
.First
.. Units
.Last
loop
634 if Fname
= Units
.Table
(J
).Unit_File_Name
then
636 Write_Str
(" file does not contain unit, Unit_Number = ");
637 Write_Int
(Int
(Unum
));
642 if Present
(Error_Node
) then
643 Get_Name_String
(Fname
);
645 if Is_Predefined_File_Name
(Fname
) then
646 Error_Msg_Unit_1
:= Uname_Actual
;
648 ("$$ is not a language defined unit", Load_Msg_Sloc
);
650 Error_Msg_File_1
:= Fname
;
651 Error_Msg_Unit_1
:= Uname_Actual
;
652 Error_Msg
("file{ does not contain unit$", Load_Msg_Sloc
);
655 Write_Dependency_Chain
;
667 -- If we are proceeding with load, then make load stack entry,
668 -- and indicate the kind of with_clause responsible for the load.
670 Load_Stack
.Increment_Last
;
671 Load_Stack
.Table
(Load_Stack
.Last
) := (Unum
, With_Node
);
673 -- Case of entry already in table
675 if Unum
<= Units
.Last
then
677 -- Here is where we check for a circular dependency, which is
678 -- an attempt to load a unit which is currently in the process
679 -- of being loaded. We do *not* care about a circular chain that
680 -- leads back to a body, because this kind of circular dependence
681 -- legitimately occurs (e.g. two package bodies that contain
682 -- inlined subprogram referenced by the other).
684 -- Ada 2005 (AI-50217): We also ignore limited_with clauses, because
685 -- their purpose is precisely to create legal circular structures.
688 and then (Is_Spec_Name
(Units
.Table
(Unum
).Unit_Name
)
689 or else Acts_As_Spec
(Units
.Table
(Unum
).Cunit
))
690 and then (Nkind
(Error_Node
) /= N_With_Clause
691 or else not Limited_Present
(Error_Node
))
692 and then not From_Limited_With_Chain
695 Write_Str
(" circular dependency encountered");
699 if Present
(Error_Node
) then
700 Error_Msg
("circular unit dependency", Load_Msg_Sloc
);
701 Write_Dependency_Chain
;
703 Load_Stack
.Decrement_Last
;
711 Write_Str
(" unit already in file table, Unit_Number = ");
712 Write_Int
(Int
(Unum
));
716 Load_Stack
.Decrement_Last
;
719 -- Unit is not already in table, so try to open the file
723 Write_Str
(" attempt unit load, Unit_Number = ");
724 Write_Int
(Int
(Unum
));
728 Src_Ind
:= Load_Source_File
(Fname
);
730 -- Make a partial entry in the file table, used even in the file not
731 -- found case to print the dependency chain including the last entry
733 Units
.Increment_Last
;
734 Init_Unit_Name
(Unum
, Uname_Actual
);
738 if Src_Ind
> No_Source_File
then
739 Units
.Table
(Unum
) :=
741 Cunit_Entity
=> Empty
,
743 Dynamic_Elab
=> False,
744 Error_Location
=> Sloc
(Error_Node
),
745 Expected_Unit
=> Uname_Actual
,
747 Generate_Code
=> False,
750 Ident_String
=> Empty
,
752 Is_Predefined_Renaming
=> Ren_Name
,
753 Is_Predefined_Unit
=> Pre_Name
or Ren_Name
,
754 Is_Internal_Unit
=> Pre_Name
or Ren_Name
or GNAT_Name
,
758 Main_Priority
=> Default_Main_Priority
,
759 Main_CPU
=> Default_Main_CPU
,
760 Primary_Stack_Count
=> 0,
761 Sec_Stack_Count
=> 0,
763 No_Elab_Code_All
=> False,
765 Source_Index
=> Src_Ind
,
766 Unit_File_Name
=> Fname
,
767 Unit_Name
=> Uname_Actual
,
768 Version
=> Source_Checksum
(Src_Ind
),
771 -- Parse the new unit
774 Save_Index
: constant Nat
:= Multiple_Unit_Index
;
775 Save_PMES
: constant Boolean := Parsing_Main_Extended_Source
;
778 Multiple_Unit_Index
:= Get_Unit_Index
(Uname_Actual
);
779 Units
.Table
(Unum
).Munit_Index
:= Multiple_Unit_Index
;
780 Initialize_Scanner
(Unum
, Source_Index
(Unum
));
782 if Calling_Unit
= Main_Unit
and then Subunit
then
783 Parsing_Main_Extended_Source
:= True;
786 Discard_List
(Par
(Configuration_Pragmas
=> False));
788 Parsing_Main_Extended_Source
:= Save_PMES
;
790 Multiple_Unit_Index
:= Save_Index
;
791 Set_Loading
(Unum
, False);
794 -- If spec is irrelevant, then post errors and quit
796 if Corr_Body
/= No_Unit
797 and then Spec_Is_Irrelevant
(Unum
, Corr_Body
)
799 Error_Msg_File_1
:= Unit_File_Name
(Corr_Body
);
801 ("cannot compile subprogram in file {!", Load_Msg_Sloc
);
802 Error_Msg_File_1
:= Unit_File_Name
(Unum
);
804 ("\incorrect spec in file { must be removed first!",
810 -- If loaded unit had an error, then caller inherits setting
812 if Present
(Error_Node
) then
813 case Units
.Table
(Unum
).Fatal_Error
is
815 -- Nothing to do if with'ed unit had no error
820 -- If with'ed unit had a detected fatal error, propagate it
822 when Error_Detected
=>
823 Units
.Table
(Calling_Unit
).Fatal_Error
:= Error_Detected
;
825 -- If with'ed unit had an ignored error, then propagate it
826 -- but do not overide an existing setting.
828 when Error_Ignored
=>
829 if Units
.Table
(Calling_Unit
).Fatal_Error
= None
then
830 Units
.Table
(Calling_Unit
).Fatal_Error
:=
836 -- Remove load stack entry and return the entry in the file table
838 Load_Stack
.Decrement_Last
;
840 -- All done, return unit number
844 -- Case of file not found
848 if Src_Ind
= No_Access_To_Source_File
then
849 Write_Str
(" no read access to file, load failed");
851 Write_Str
(" file was not found, load failed");
857 -- Generate message if unit required
860 Get_Name_String
(Fname
);
862 if Is_Predefined_File_Name
(Fname
) then
864 -- This is a predefined library unit which is not present
865 -- in the run time. If a predefined unit is not available
866 -- it may very likely be the case that there is also pragma
867 -- Restriction forbidding its usage. This is typically the
868 -- case when building a configurable run time, where the
869 -- usage of certain run-time units is restricted by means
870 -- of both the corresponding pragma Restriction (such as
871 -- No_Calendar), and by not including the unit. Hence, we
872 -- check whether this predefined unit is forbidden, so that
873 -- the message about the restriction violation is generated,
876 if Present
(Error_Node
) then
877 Check_Restricted_Unit
(Load_Name
, Error_Node
);
880 Error_Msg_Unit_1
:= Uname_Actual
;
882 ("$$ is not a predefined library unit", Load_Msg_Sloc
);
885 Error_Msg_File_1
:= Fname
;
887 if Src_Ind
= No_Access_To_Source_File
then
888 Error_Msg
("no read access to file{", Load_Msg_Sloc
);
890 Error_Msg
("file{ not found", Load_Msg_Sloc
);
894 Write_Dependency_Chain
;
896 -- Remove unit from stack, to avoid cascaded errors on
897 -- subsequent missing files.
899 Load_Stack
.Decrement_Last
;
902 -- If unit not required, remove load stack entry and the junk
903 -- file table entry, and return No_Unit to indicate not found.
906 Load_Stack
.Decrement_Last
;
915 -- Here to exit, with result in Unum
918 Parsing_Main_Extended_Source
:= Save_PMES
;
919 Cunit_Boolean_Restrictions_Restore
(Save_Cunit_Restrictions
);
923 --------------------------
924 -- Make_Child_Decl_Unit --
925 --------------------------
927 procedure Make_Child_Decl_Unit
(N
: Node_Id
) is
928 Unit_Decl
: constant Node_Id
:= Library_Unit
(N
);
929 Unit_Num
: constant Unit_Number_Type
:= Get_Cunit_Unit_Number
(N
);
932 Units
.Increment_Last
;
933 Units
.Table
(Units
.Last
) := Units
.Table
(Unit_Num
);
934 Units
.Table
(Units
.Last
).Cunit
:= Unit_Decl
;
935 Units
.Table
(Units
.Last
).Cunit_Entity
:=
937 (Defining_Unit_Name
(Specification
(Unit
(Unit_Decl
))));
938 Init_Unit_Name
(Units
.Last
, Get_Spec_Name
(Unit_Name
(Unit_Num
)));
940 -- The library unit created for of a child subprogram unit plays no
941 -- role in code generation and binding, so label it accordingly.
943 Units
.Table
(Units
.Last
).Generate_Code
:= False;
944 Set_Has_No_Elaboration_Code
(Unit_Decl
);
945 end Make_Child_Decl_Unit
;
947 ------------------------
948 -- Make_Instance_Unit --
949 ------------------------
951 -- If the unit is an instance, it appears as a package declaration, but
952 -- contains both declaration and body of the instance. The body becomes
953 -- the main unit of the compilation, and the declaration is inserted
954 -- at the end of the unit table. The main unit now has the name of a
955 -- body, which is constructed from the name of the original spec,
956 -- and is attached to the compilation node of the original unit. The
957 -- declaration has been attached to a new compilation unit node, and
958 -- code will have to be generated for it.
960 procedure Make_Instance_Unit
(N
: Node_Id
; In_Main
: Boolean) is
961 Sind
: constant Source_File_Index
:= Source_Index
(Main_Unit
);
964 Units
.Increment_Last
;
967 Units
.Table
(Units
.Last
) := Units
.Table
(Main_Unit
);
968 Units
.Table
(Units
.Last
).Cunit
:= Library_Unit
(N
);
969 Init_Unit_Name
(Units
.Last
, Unit_Name
(Main_Unit
));
971 Units
.Table
(Main_Unit
).Cunit
:= N
;
972 Units
.Table
(Main_Unit
).Version
:= Source_Checksum
(Sind
);
973 Init_Unit_Name
(Main_Unit
,
975 (Unit_Name
(Get_Cunit_Unit_Number
(Library_Unit
(N
)))));
978 -- Duplicate information from instance unit, for the body. The unit
979 -- node N has been rewritten as a body, but it was placed in the
980 -- units table when first loaded as a declaration.
982 Units
.Table
(Units
.Last
) := Units
.Table
(Get_Cunit_Unit_Number
(N
));
983 Units
.Table
(Units
.Last
).Cunit
:= Library_Unit
(N
);
985 end Make_Instance_Unit
;
987 ------------------------
988 -- Spec_Is_Irrelevant --
989 ------------------------
991 function Spec_Is_Irrelevant
992 (Spec_Unit
: Unit_Number_Type
;
993 Body_Unit
: Unit_Number_Type
) return Boolean
995 Sunit
: constant Node_Id
:= Cunit
(Spec_Unit
);
996 Bunit
: constant Node_Id
:= Cunit
(Body_Unit
);
999 -- The spec is irrelevant if the body is a subprogram body, and the spec
1000 -- is other than a subprogram spec or generic subprogram spec. Note that
1001 -- the names must be the same, we don't need to check that, because we
1002 -- already know that from the fact that the file names are the same.
1005 Nkind
(Unit
(Bunit
)) = N_Subprogram_Body
1006 and then Nkind
(Unit
(Sunit
)) /= N_Subprogram_Declaration
1007 and then Nkind
(Unit
(Sunit
)) /= N_Generic_Subprogram_Declaration
;
1008 end Spec_Is_Irrelevant
;
1010 --------------------
1011 -- Version_Update --
1012 --------------------
1014 procedure Version_Update
(U
: Node_Id
; From
: Node_Id
) is
1015 Unum
: constant Unit_Number_Type
:= Get_Cunit_Unit_Number
(U
);
1016 Fnum
: constant Unit_Number_Type
:= Get_Cunit_Unit_Number
(From
);
1018 if Source_Index
(Fnum
) > No_Source_File
then
1019 Units
.Table
(Unum
).Version
:=
1020 Units
.Table
(Unum
).Version
1022 Source_Checksum
(Source_Index
(Fnum
));
1026 ----------------------------
1027 -- Write_Dependency_Chain --
1028 ----------------------------
1030 procedure Write_Dependency_Chain
is
1032 -- The dependency chain is only written if it is at least two entries
1033 -- deep, otherwise it is trivial (the main unit depending on a unit
1034 -- that it obviously directly depends on).
1036 if Load_Stack
.Last
- 1 > Load_Stack
.First
then
1037 for U
in Load_Stack
.First
.. Load_Stack
.Last
- 1 loop
1039 Unit_Name
(Load_Stack
.Table
(U
).Unit_Number
);
1041 Unit_Name
(Load_Stack
.Table
(U
+ 1).Unit_Number
);
1042 Error_Msg
("$ depends on $!", Load_Msg_Sloc
);
1045 end Write_Dependency_Chain
;