1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1998-2011, 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 Csets; use Csets;
28 with Elists; use Elists;
29 with Errout; use Errout;
30 with Nlists; use Nlists;
32 with Restrict; use Restrict;
33 with Rident; use Rident;
35 with Sem_Aux; use Sem_Aux;
36 with Sem_Prag; use Sem_Prag;
37 with Sem_Util; use Sem_Util;
38 with Sem_Warn; use Sem_Warn;
39 with Sinfo; use Sinfo;
40 with Sinput; use Sinput;
41 with Snames; use Snames;
42 with Stringt; use Stringt;
43 with Stand; use Stand;
44 with Table; use Table;
46 with GNAT.Heap_Sort_G;
49 package body Lib.Xref is
55 -- The Xref table is used to record references. The Loc field is set
56 -- to No_Location for a definition entry.
58 subtype Xref_Entry_Number is Int;
60 type Xref_Key is record
61 -- These are the components of Xref_Entry that participate in hash
65 -- Entity referenced (E parameter to Generate_Reference)
68 -- Location of reference (Original_Location (Sloc field of N parameter
69 -- to Generate_Reference). Set to No_Location for the case of a
70 -- defining occurrence.
73 -- Reference type (Typ param to Generate_Reference)
75 Eun : Unit_Number_Type;
76 -- Unit number corresponding to Ent
78 Lun : Unit_Number_Type;
79 -- Unit number corresponding to Loc. Value is undefined and not
80 -- referenced if Loc is set to No_Location.
82 -- The following components are only used for Alfa cross-references
84 Ref_Scope : Entity_Id;
85 -- Entity of the closest subprogram or package enclosing the reference
87 Ent_Scope : Entity_Id;
88 -- Entity of the closest subprogram or package enclosing the definition,
89 -- which should be located in the same file as the definition itself.
92 type Xref_Entry is record
95 Ent_Scope_File : Unit_Number_Type;
96 -- File for entity Ent_Scope
99 -- Original source location for entity being referenced. Note that these
100 -- values are used only during the output process, they are not set when
101 -- the entries are originally built. This is because private entities
102 -- can be swapped when the initial call is made.
104 HTable_Next : Xref_Entry_Number;
105 -- For use only by Static_HTable
108 package Xrefs is new Table.Table (
109 Table_Component_Type => Xref_Entry,
110 Table_Index_Type => Xref_Entry_Number,
111 Table_Low_Bound => 1,
112 Table_Initial => Alloc.Xrefs_Initial,
113 Table_Increment => Alloc.Xrefs_Increment,
114 Table_Name => "Xrefs");
120 -- We keep a set of xref entries, in order to avoid inserting duplicate
121 -- entries into the above Xrefs table. An entry is in Xref_Set if and only
122 -- if it is in Xrefs.
124 Num_Buckets : constant := 2**16;
126 subtype Header_Num is Integer range 0 .. Num_Buckets - 1;
127 type Null_Type is null record;
128 pragma Unreferenced (Null_Type);
130 function Hash (F : Xref_Entry_Number) return Header_Num;
132 function Equal (F1, F2 : Xref_Entry_Number) return Boolean;
134 procedure HT_Set_Next (E : Xref_Entry_Number; Next : Xref_Entry_Number);
136 function HT_Next (E : Xref_Entry_Number) return Xref_Entry_Number;
138 function Get_Key (E : Xref_Entry_Number) return Xref_Entry_Number;
140 pragma Inline (Hash, Equal, HT_Set_Next, HT_Next, Get_Key);
142 package Xref_Set is new GNAT.HTable.Static_HTable (
144 Element => Xref_Entry,
145 Elmt_Ptr => Xref_Entry_Number,
147 Set_Next => HT_Set_Next,
149 Key => Xref_Entry_Number,
154 ----------------------
155 -- Alfa Information --
156 ----------------------
158 package body Alfa is separate;
160 ------------------------
161 -- Local Subprograms --
162 ------------------------
164 procedure Generate_Prim_Op_References (Typ : Entity_Id);
165 -- For a tagged type, generate implicit references to its primitive
166 -- operations, for source navigation. This is done right before emitting
167 -- cross-reference information rather than at the freeze point of the type
168 -- in order to handle late bodies that are primitive operations.
170 function Lt (T1, T2 : Xref_Entry) return Boolean;
171 -- Order cross-references
173 procedure Add_Entry (Key : Xref_Key; Ent_Scope_File : Unit_Number_Type);
174 -- Add an entry to the tables of Xref_Entries, avoiding duplicates
180 procedure Add_Entry (Key : Xref_Key; Ent_Scope_File : Unit_Number_Type) is
182 Xrefs.Increment_Last; -- tentative
183 Xrefs.Table (Xrefs.Last).Key := Key;
185 -- Set the entry in Xref_Set, and if newly set, keep the above
186 -- tentative increment.
188 if Xref_Set.Set_If_Not_Present (Xrefs.Last) then
189 Xrefs.Table (Xrefs.Last).Ent_Scope_File := Ent_Scope_File;
190 -- Leave Def and HTable_Next uninitialized
192 Set_Has_Xref_Entry (Key.Ent);
194 -- It was already in Xref_Set, so throw away the tentatively-added
198 Xrefs.Decrement_Last;
206 function Equal (F1, F2 : Xref_Entry_Number) return Boolean is
207 Result : constant Boolean :=
208 Xrefs.Table (F1).Key = Xrefs.Table (F2).Key;
213 -------------------------
214 -- Generate_Definition --
215 -------------------------
217 procedure Generate_Definition (E : Entity_Id) is
219 pragma Assert (Nkind (E) in N_Entity);
221 -- Note that we do not test Xref_Entity_Letters here. It is too early
222 -- to do so, since we are often called before the entity is fully
223 -- constructed, so that the Ekind is still E_Void.
227 -- Definition must come from source
229 -- We make an exception for subprogram child units that have no spec.
230 -- For these we generate a subprogram declaration for library use,
231 -- and the corresponding entity does not come from source.
232 -- Nevertheless, all references will be attached to it and we have
233 -- to treat is as coming from user code.
235 and then (Comes_From_Source (E) or else Is_Child_Unit (E))
237 -- And must have a reasonable source location that is not
238 -- within an instance (all entities in instances are ignored)
240 and then Sloc (E) > No_Location
241 and then Instantiation_Location (Sloc (E)) = No_Location
243 -- And must be a non-internal name from the main source unit
245 and then In_Extended_Main_Source_Unit (E)
246 and then not Is_Internal_Name (Chars (E))
252 Eun => Get_Source_Unit (Original_Location (Sloc (E))),
256 Ent_Scope_File => No_Unit);
258 if In_Inlined_Body then
262 end Generate_Definition;
264 ---------------------------------
265 -- Generate_Operator_Reference --
266 ---------------------------------
268 procedure Generate_Operator_Reference
273 if not In_Extended_Main_Source_Unit (N) then
277 -- If the operator is not a Standard operator, then we generate a real
278 -- reference to the user defined operator.
280 if Sloc (Entity (N)) /= Standard_Location then
281 Generate_Reference (Entity (N), N);
283 -- A reference to an implicit inequality operator is also a reference
284 -- to the user-defined equality.
286 if Nkind (N) = N_Op_Ne
287 and then not Comes_From_Source (Entity (N))
288 and then Present (Corresponding_Equality (Entity (N)))
290 Generate_Reference (Corresponding_Equality (Entity (N)), N);
293 -- For the case of Standard operators, we mark the result type as
294 -- referenced. This ensures that in the case where we are using a
295 -- derived operator, we mark an entity of the unit that implicitly
296 -- defines this operator as used. Otherwise we may think that no entity
297 -- of the unit is used. The actual entity marked as referenced is the
298 -- first subtype, which is the relevant user defined entity.
300 -- Note: we only do this for operators that come from source. The
301 -- generated code sometimes reaches for entities that do not need to be
302 -- explicitly visible (for example, when we expand the code for
303 -- comparing two record objects, the fields of the record may not be
306 elsif Comes_From_Source (N) then
307 Set_Referenced (First_Subtype (T));
309 end Generate_Operator_Reference;
311 ---------------------------------
312 -- Generate_Prim_Op_References --
313 ---------------------------------
315 procedure Generate_Prim_Op_References (Typ : Entity_Id) is
318 Prim_List : Elist_Id;
321 -- Handle subtypes of synchronized types
323 if Ekind (Typ) = E_Protected_Subtype
324 or else Ekind (Typ) = E_Task_Subtype
326 Base_T := Etype (Typ);
331 -- References to primitive operations are only relevant for tagged types
333 if not Is_Tagged_Type (Base_T)
334 or else Is_Class_Wide_Type (Base_T)
339 -- Ada 2005 (AI-345): For synchronized types generate reference to the
340 -- wrapper that allow us to dispatch calls through their implemented
341 -- abstract interface types.
343 -- The check for Present here is to protect against previously reported
346 Prim_List := Primitive_Operations (Base_T);
348 if No (Prim_List) then
352 Prim := First_Elmt (Prim_List);
353 while Present (Prim) loop
355 -- If the operation is derived, get the original for cross-reference
356 -- reference purposes (it is the original for which we want the xref
357 -- and for which the comes_from_source test must be performed).
360 (Typ, Ultimate_Alias (Node (Prim)), 'p', Set_Ref => False);
363 end Generate_Prim_Op_References;
365 ------------------------
366 -- Generate_Reference --
367 ------------------------
369 procedure Generate_Reference
372 Typ : Character := 'r';
373 Set_Ref : Boolean := True;
374 Force : Boolean := False)
381 Actual_Typ : Character := Typ;
383 Ref_Scope : Entity_Id;
384 Ent_Scope : Entity_Id;
385 Ent_Scope_File : Unit_Number_Type;
389 -- Used for call to Find_Actual
392 -- If Formal is non-Empty, then its Ekind, otherwise E_Void
394 function Is_On_LHS (Node : Node_Id) return Boolean;
395 -- Used to check if a node is on the left hand side of an assignment.
396 -- The following cases are handled:
398 -- Variable Node is a direct descendant of left hand side of an
399 -- assignment statement.
401 -- Prefix Of an indexed or selected component that is present in
402 -- a subtree rooted by an assignment statement. There is
403 -- no restriction of nesting of components, thus cases
404 -- such as A.B (C).D are handled properly. However a prefix
405 -- of a dereference (either implicit or explicit) is never
406 -- considered as on a LHS.
408 -- Out param Same as above cases, but OUT parameter
410 function OK_To_Set_Referenced return Boolean;
411 -- Returns True if the Referenced flag can be set. There are a few
412 -- exceptions where we do not want to set this flag, see body for
413 -- details of these exceptional cases.
419 -- ??? There are several routines here and there that perform a similar
420 -- (but subtly different) computation, which should be factored:
422 -- Sem_Util.May_Be_Lvalue
423 -- Sem_Util.Known_To_Be_Assigned
424 -- Exp_Ch2.Expand_Entry_Parameter.In_Assignment_Context
425 -- Exp_Smem.Is_Out_Actual
427 function Is_On_LHS (Node : Node_Id) return Boolean is
433 -- Only identifiers are considered, is this necessary???
435 if Nkind (Node) /= N_Identifier then
439 -- Immediate return if appeared as OUT parameter
441 if Kind = E_Out_Parameter then
445 -- Search for assignment statement subtree root
452 if K = N_Assignment_Statement then
455 -- Check whether the parent is a component and the current node is
456 -- its prefix, but return False if the current node has an access
457 -- type, as in that case the selected or indexed component is an
458 -- implicit dereference, and the LHS is the designated object, not
459 -- the access object.
461 -- ??? case of a slice assignment?
463 -- ??? Note that in some cases this is called too early
464 -- (see comments in Sem_Ch8.Find_Direct_Name), at a point where
465 -- the tree is not fully typed yet. In that case we may lack
466 -- an Etype for N, and we must disable the check for an implicit
467 -- dereference. If the dereference is on an LHS, this causes a
470 elsif (K = N_Selected_Component or else K = N_Indexed_Component)
471 and then Prefix (P) = N
472 and then not (Present (Etype (N))
474 Is_Access_Type (Etype (N)))
478 -- All other cases, definitely not on left side
486 ---------------------------
487 -- OK_To_Set_Referenced --
488 ---------------------------
490 function OK_To_Set_Referenced return Boolean is
494 -- A reference from a pragma Unreferenced or pragma Unmodified or
495 -- pragma Warnings does not cause the Referenced flag to be set.
496 -- This avoids silly warnings about things being referenced and
497 -- not assigned when the only reference is from the pragma.
499 if Nkind (N) = N_Identifier then
502 if Nkind (P) = N_Pragma_Argument_Association then
505 if Nkind (P) = N_Pragma then
506 if Pragma_Name (P) = Name_Warnings
508 Pragma_Name (P) = Name_Unmodified
510 Pragma_Name (P) = Name_Unreferenced
516 -- A reference to a formal in a named parameter association does
517 -- not make the formal referenced. Formals that are unused in the
518 -- subprogram body are properly flagged as such, even if calls
519 -- elsewhere use named notation.
521 elsif Nkind (P) = N_Parameter_Association
522 and then N = Selector_Name (P)
529 end OK_To_Set_Referenced;
531 -- Start of processing for Generate_Reference
534 pragma Assert (Nkind (E) in N_Entity);
535 Find_Actual (N, Formal, Call);
537 if Present (Formal) then
538 Kind := Ekind (Formal);
543 -- Check for obsolescent reference to package ASCII. GNAT treats this
544 -- element of annex J specially since in practice, programs make a lot
545 -- of use of this feature, so we don't include it in the set of features
546 -- diagnosed when Warn_On_Obsolescent_Features mode is set. However we
547 -- are required to note it as a violation of the RM defined restriction.
549 if E = Standard_ASCII then
550 Check_Restriction (No_Obsolescent_Features, N);
553 -- Check for reference to entity marked with Is_Obsolescent
555 -- Note that we always allow obsolescent references in the compiler
556 -- itself and the run time, since we assume that we know what we are
557 -- doing in such cases. For example the calls in Ada.Characters.Handling
558 -- to its own obsolescent subprograms are just fine.
560 -- In any case we do not generate warnings within the extended source
561 -- unit of the entity in question, since we assume the source unit
562 -- itself knows what is going on (and for sure we do not want silly
563 -- warnings, e.g. on the end line of an obsolescent procedure body).
565 if Is_Obsolescent (E)
566 and then not GNAT_Mode
567 and then not In_Extended_Main_Source_Unit (E)
569 Check_Restriction (No_Obsolescent_Features, N);
571 if Warn_On_Obsolescent_Feature then
572 Output_Obsolescent_Entity_Warnings (N, E);
576 -- Warn if reference to Ada 2005 entity not in Ada 2005 mode. We only
577 -- detect real explicit references (modifications and references).
579 if Comes_From_Source (N)
580 and then Is_Ada_2005_Only (E)
581 and then Ada_Version < Ada_2005
582 and then Warn_On_Ada_2005_Compatibility
583 and then (Typ = 'm' or else Typ = 'r' or else Typ = 's')
585 Error_Msg_NE ("& is only defined in Ada 2005?", N, E);
588 -- Warn if reference to Ada 2012 entity not in Ada 2012 mode. We only
589 -- detect real explicit references (modifications and references).
591 if Comes_From_Source (N)
592 and then Is_Ada_2012_Only (E)
593 and then Ada_Version < Ada_2012
594 and then Warn_On_Ada_2012_Compatibility
595 and then (Typ = 'm' or else Typ = 'r')
597 Error_Msg_NE ("& is only defined in Ada 2012?", N, E);
600 -- Never collect references if not in main source unit. However, we omit
601 -- this test if Typ is 'e' or 'k', since these entries are structural,
602 -- and it is useful to have them in units that reference packages as
603 -- well as units that define packages. We also omit the test for the
604 -- case of 'p' since we want to include inherited primitive operations
605 -- from other packages.
607 -- We also omit this test is this is a body reference for a subprogram
608 -- instantiation. In this case the reference is to the generic body,
609 -- which clearly need not be in the main unit containing the instance.
610 -- For the same reason we accept an implicit reference generated for
611 -- a default in an instance.
613 if not In_Extended_Main_Source_Unit (N) then
619 or else (Typ = 'b' and then Is_Generic_Instance (E))
627 -- For reference type p, the entity must be in main source unit
629 if Typ = 'p' and then not In_Extended_Main_Source_Unit (E) then
633 -- Unless the reference is forced, we ignore references where the
634 -- reference itself does not come from source.
636 if not Force and then not Comes_From_Source (N) then
640 -- Deal with setting entity as referenced, unless suppressed. Note that
641 -- we still do Set_Referenced on entities that do not come from source.
642 -- This situation arises when we have a source reference to a derived
643 -- operation, where the derived operation itself does not come from
644 -- source, but we still want to mark it as referenced, since we really
645 -- are referencing an entity in the corresponding package (this avoids
646 -- wrong complaints that the package contains no referenced entities).
650 -- Assignable object appearing on left side of assignment or as
654 and then Is_On_LHS (N)
655 and then Ekind (E) /= E_In_Out_Parameter
657 -- For objects that are renamings, just set as simply referenced
658 -- we do not try to do assignment type tracking in this case.
660 if Present (Renamed_Object (E)) then
663 -- Out parameter case
665 elsif Kind = E_Out_Parameter then
667 -- If warning mode for all out parameters is set, or this is
668 -- the only warning parameter, then we want to mark this for
669 -- later warning logic by setting Referenced_As_Out_Parameter
671 if Warn_On_Modified_As_Out_Parameter (Formal) then
672 Set_Referenced_As_Out_Parameter (E, True);
673 Set_Referenced_As_LHS (E, False);
675 -- For OUT parameter not covered by the above cases, we simply
676 -- regard it as a normal reference (in this case we do not
677 -- want any of the warning machinery for out parameters).
683 -- For the left hand of an assignment case, we do nothing here.
684 -- The processing for Analyze_Assignment_Statement will set the
685 -- Referenced_As_LHS flag.
691 -- Check for a reference in a pragma that should not count as a
692 -- making the variable referenced for warning purposes.
694 elsif Is_Non_Significant_Pragma_Reference (N) then
697 -- A reference in an attribute definition clause does not count as a
698 -- reference except for the case of Address. The reason that 'Address
699 -- is an exception is that it creates an alias through which the
700 -- variable may be referenced.
702 elsif Nkind (Parent (N)) = N_Attribute_Definition_Clause
703 and then Chars (Parent (N)) /= Name_Address
704 and then N = Name (Parent (N))
708 -- Constant completion does not count as a reference
711 and then Ekind (E) = E_Constant
715 -- Record representation clause does not count as a reference
717 elsif Nkind (N) = N_Identifier
718 and then Nkind (Parent (N)) = N_Record_Representation_Clause
722 -- Discriminants do not need to produce a reference to record type
725 and then Nkind (Parent (N)) = N_Discriminant_Specification
732 -- Special processing for IN OUT parameters, where we have an
733 -- implicit assignment to a simple variable.
735 if Kind = E_In_Out_Parameter
736 and then Is_Assignable (E)
738 -- For sure this counts as a normal read reference
741 Set_Last_Assignment (E, Empty);
743 -- We count it as being referenced as an out parameter if the
744 -- option is set to warn on all out parameters, except that we
745 -- have a special exclusion for an intrinsic subprogram, which
746 -- is most likely an instantiation of Unchecked_Deallocation
747 -- which we do not want to consider as an assignment since it
748 -- generates false positives. We also exclude the case of an
749 -- IN OUT parameter if the name of the procedure is Free,
750 -- since we suspect similar semantics.
752 if Warn_On_All_Unread_Out_Parameters
753 and then Is_Entity_Name (Name (Call))
754 and then not Is_Intrinsic_Subprogram (Entity (Name (Call)))
755 and then Chars (Name (Call)) /= Name_Free
757 Set_Referenced_As_Out_Parameter (E, True);
758 Set_Referenced_As_LHS (E, False);
761 -- Don't count a recursive reference within a subprogram as a
762 -- reference (that allows detection of a recursive subprogram
763 -- whose only references are recursive calls as unreferenced).
765 elsif Is_Subprogram (E)
766 and then E = Nearest_Dynamic_Scope (Current_Scope)
770 -- Any other occurrence counts as referencing the entity
772 elsif OK_To_Set_Referenced then
775 -- If variable, this is an OK reference after an assignment
776 -- so we can clear the Last_Assignment indication.
778 if Is_Assignable (E) then
779 Set_Last_Assignment (E, Empty);
784 -- Check for pragma Unreferenced given and reference is within
785 -- this source unit (occasion for possible warning to be issued).
787 if Has_Unreferenced (E)
788 and then In_Same_Extended_Unit (E, N)
790 -- A reference as a named parameter in a call does not count
791 -- as a violation of pragma Unreferenced for this purpose...
793 if Nkind (N) = N_Identifier
794 and then Nkind (Parent (N)) = N_Parameter_Association
795 and then Selector_Name (Parent (N)) = N
799 -- ... Neither does a reference to a variable on the left side
802 elsif Is_On_LHS (N) then
805 -- For entry formals, we want to place the warning message on the
806 -- corresponding entity in the accept statement. The current scope
807 -- is the body of the accept, so we find the formal whose name
808 -- matches that of the entry formal (there is no link between the
809 -- two entities, and the one in the accept statement is only used
810 -- for conformance checking).
812 elsif Ekind (Scope (E)) = E_Entry then
817 BE := First_Entity (Current_Scope);
818 while Present (BE) loop
819 if Chars (BE) = Chars (E) then
820 Error_Msg_NE -- CODEFIX
821 ("?pragma Unreferenced given for&!", N, BE);
829 -- Here we issue the warning, since this is a real reference
832 Error_Msg_NE -- CODEFIX
833 ("?pragma Unreferenced given for&!", N, E);
837 -- If this is a subprogram instance, mark as well the internal
838 -- subprogram in the wrapper package, which may be a visible
841 if Is_Overloadable (E)
842 and then Is_Generic_Instance (E)
843 and then Present (Alias (E))
845 Set_Referenced (Alias (E));
849 -- Generate reference if all conditions are met:
852 -- Cross referencing must be active
856 -- The entity must be one for which we collect references
858 and then Xref_Entity_Letters (Ekind (E)) /= ' '
860 -- Both Sloc values must be set to something sensible
862 and then Sloc (E) > No_Location
863 and then Sloc (N) > No_Location
865 -- We ignore references from within an instance, except for default
866 -- subprograms, for which we generate an implicit reference.
869 (Instantiation_Location (Sloc (N)) = No_Location or else Typ = 'i')
871 -- Ignore dummy references
875 if Nkind (N) = N_Identifier
877 Nkind (N) = N_Defining_Identifier
881 Nkind (N) = N_Defining_Operator_Symbol
883 Nkind (N) = N_Operator_Symbol
885 (Nkind (N) = N_Character_Literal
886 and then Sloc (Entity (N)) /= Standard_Location)
888 Nkind (N) = N_Defining_Character_Literal
892 elsif Nkind (N) = N_Expanded_Name
894 Nkind (N) = N_Selected_Component
896 Nod := Selector_Name (N);
902 -- Normal case of source entity comes from source
904 if Comes_From_Source (E) then
907 -- Entity does not come from source, but is a derived subprogram and
908 -- the derived subprogram comes from source (after one or more
909 -- derivations) in which case the reference is to parent subprogram.
911 elsif Is_Overloadable (E)
912 and then Present (Alias (E))
915 while not Comes_From_Source (Ent) loop
916 if No (Alias (Ent)) then
923 -- The internally created defining entity for a child subprogram
924 -- that has no previous spec has valid references.
926 elsif Is_Overloadable (E)
927 and then Is_Child_Unit (E)
931 -- Record components of discriminated subtypes or derived types must
932 -- be treated as references to the original component.
934 elsif Ekind (E) = E_Component
935 and then Comes_From_Source (Original_Record_Component (E))
937 Ent := Original_Record_Component (E);
939 -- If this is an expanded reference to a discriminant, recover the
940 -- original discriminant, which gets the reference.
942 elsif Ekind (E) = E_In_Parameter
943 and then Present (Discriminal_Link (E))
945 Ent := Discriminal_Link (E);
946 Set_Referenced (Ent);
948 -- Ignore reference to any other entity that is not from source
954 -- In Alfa mode, consider the underlying entity renamed instead of
955 -- the renaming, which is needed to compute a valid set of effects
956 -- (reads, writes) for the enclosing subprogram.
959 and then Is_Object (Ent)
960 and then Present (Renamed_Object (Ent))
962 Ent := Get_Enclosing_Object (Renamed_Object (Ent));
964 -- If no enclosing object, then it could be a reference to any
965 -- location not tracked individually, like heap-allocated data.
966 -- Conservatively approximate this possibility by generating a
967 -- dereference, and return.
970 if Actual_Typ = 'w' then
971 Alfa.Generate_Dereference (Nod, 'r');
972 Alfa.Generate_Dereference (Nod, 'w');
974 Alfa.Generate_Dereference (Nod, 'r');
981 -- Record reference to entity
983 Ref := Original_Location (Sloc (Nod));
984 Def := Original_Location (Sloc (Ent));
987 and then Is_Subprogram (N)
988 and then Present (Overridden_Operation (N))
994 Ref_Scope := Alfa.Enclosing_Subprogram_Or_Package (N);
995 Ent_Scope := Alfa.Enclosing_Subprogram_Or_Package (Ent);
996 Ent_Scope_File := Get_Source_Unit (Ent_Scope);
1001 Ent_Scope_File := No_Unit;
1008 Eun => Get_Source_Unit (Def),
1009 Lun => Get_Source_Unit (Ref),
1010 Ref_Scope => Ref_Scope,
1011 Ent_Scope => Ent_Scope),
1012 Ent_Scope_File => Ent_Scope_File);
1014 end Generate_Reference;
1016 -----------------------------------
1017 -- Generate_Reference_To_Formals --
1018 -----------------------------------
1020 procedure Generate_Reference_To_Formals (E : Entity_Id) is
1024 if Is_Generic_Subprogram (E) then
1025 Formal := First_Entity (E);
1027 while Present (Formal)
1028 and then not Is_Formal (Formal)
1030 Next_Entity (Formal);
1034 Formal := First_Formal (E);
1037 while Present (Formal) loop
1038 if Ekind (Formal) = E_In_Parameter then
1040 if Nkind (Parameter_Type (Parent (Formal)))
1041 = N_Access_Definition
1043 Generate_Reference (E, Formal, '^', False);
1045 Generate_Reference (E, Formal, '>', False);
1048 elsif Ekind (Formal) = E_In_Out_Parameter then
1049 Generate_Reference (E, Formal, '=', False);
1052 Generate_Reference (E, Formal, '<', False);
1055 Next_Formal (Formal);
1057 end Generate_Reference_To_Formals;
1059 -------------------------------------------
1060 -- Generate_Reference_To_Generic_Formals --
1061 -------------------------------------------
1063 procedure Generate_Reference_To_Generic_Formals (E : Entity_Id) is
1067 Formal := First_Entity (E);
1068 while Present (Formal) loop
1069 if Comes_From_Source (Formal) then
1070 Generate_Reference (E, Formal, 'z', False);
1073 Next_Entity (Formal);
1075 end Generate_Reference_To_Generic_Formals;
1081 function Get_Key (E : Xref_Entry_Number) return Xref_Entry_Number is
1090 function Hash (F : Xref_Entry_Number) return Header_Num is
1091 -- It is unlikely to have two references to the same entity at the same
1092 -- source location, so the hash function depends only on the Ent and Loc
1095 XE : Xref_Entry renames Xrefs.Table (F);
1096 type M is mod 2**32;
1098 H : constant M := M (XE.Key.Ent) + 2 ** 7 * M (abs XE.Key.Loc);
1099 -- It would be more natural to write:
1101 -- H : constant M := M'Mod (XE.Key.Ent) + 2**7 * M'Mod (XE.Key.Loc);
1103 -- But we can't use M'Mod, because it prevents bootstrapping with older
1104 -- compilers. Loc can be negative, so we do "abs" before converting.
1105 -- One day this can be cleaned up ???
1108 return Header_Num (H mod Num_Buckets);
1115 procedure HT_Set_Next (E : Xref_Entry_Number; Next : Xref_Entry_Number) is
1117 Xrefs.Table (E).HTable_Next := Next;
1124 function HT_Next (E : Xref_Entry_Number) return Xref_Entry_Number is
1126 return Xrefs.Table (E).HTable_Next;
1133 procedure Initialize is
1142 function Lt (T1, T2 : Xref_Entry) return Boolean is
1144 -- First test: if entity is in different unit, sort by unit
1146 if T1.Key.Eun /= T2.Key.Eun then
1147 return Dependency_Num (T1.Key.Eun) < Dependency_Num (T2.Key.Eun);
1149 -- Second test: within same unit, sort by entity Sloc
1151 elsif T1.Def /= T2.Def then
1152 return T1.Def < T2.Def;
1154 -- Third test: sort definitions ahead of references
1156 elsif T1.Key.Loc = No_Location then
1159 elsif T2.Key.Loc = No_Location then
1162 -- Fourth test: for same entity, sort by reference location unit
1164 elsif T1.Key.Lun /= T2.Key.Lun then
1165 return Dependency_Num (T1.Key.Lun) < Dependency_Num (T2.Key.Lun);
1167 -- Fifth test: order of location within referencing unit
1169 elsif T1.Key.Loc /= T2.Key.Loc then
1170 return T1.Key.Loc < T2.Key.Loc;
1172 -- Finally, for two locations at the same address, we prefer
1173 -- the one that does NOT have the type 'r' so that a modification
1174 -- or extension takes preference, when there are more than one
1175 -- reference at the same location. As a result, in the case of
1176 -- entities that are in-out actuals, the read reference follows
1177 -- the modify reference.
1180 return T2.Key.Typ = 'r';
1184 -----------------------
1185 -- Output_References --
1186 -----------------------
1188 procedure Output_References is
1190 procedure Get_Type_Reference
1192 Tref : out Entity_Id;
1193 Left : out Character;
1194 Right : out Character);
1195 -- Given an Entity_Id Ent, determines whether a type reference is
1196 -- required. If so, Tref is set to the entity for the type reference
1197 -- and Left and Right are set to the left/right brackets to be output
1198 -- for the reference. If no type reference is required, then Tref is
1199 -- set to Empty, and Left/Right are set to space.
1201 procedure Output_Import_Export_Info (Ent : Entity_Id);
1202 -- Output language and external name information for an interfaced
1203 -- entity, using the format <language, external_name>.
1205 ------------------------
1206 -- Get_Type_Reference --
1207 ------------------------
1209 procedure Get_Type_Reference
1211 Tref : out Entity_Id;
1212 Left : out Character;
1213 Right : out Character)
1218 -- See if we have a type reference
1227 -- Processing for types
1229 if Is_Type (Tref) then
1231 -- Case of base type
1233 if Base_Type (Tref) = Tref then
1235 -- If derived, then get first subtype
1237 if Tref /= Etype (Tref) then
1238 Tref := First_Subtype (Etype (Tref));
1240 -- Set brackets for derived type, but don't override
1241 -- pointer case since the fact that something is a
1242 -- pointer is more important.
1249 -- If non-derived ptr, get directly designated type.
1250 -- If the type has a full view, all references are on the
1251 -- partial view, that is seen first.
1253 elsif Is_Access_Type (Tref) then
1254 Tref := Directly_Designated_Type (Tref);
1258 elsif Is_Private_Type (Tref)
1259 and then Present (Full_View (Tref))
1261 if Is_Access_Type (Full_View (Tref)) then
1262 Tref := Directly_Designated_Type (Full_View (Tref));
1266 -- If the full view is an array type, we also retrieve
1267 -- the corresponding component type, because the ali
1268 -- entry already indicates that this is an array.
1270 elsif Is_Array_Type (Full_View (Tref)) then
1271 Tref := Component_Type (Full_View (Tref));
1276 -- If non-derived array, get component type. Skip component
1277 -- type for case of String or Wide_String, saves worthwhile
1280 elsif Is_Array_Type (Tref)
1281 and then Tref /= Standard_String
1282 and then Tref /= Standard_Wide_String
1284 Tref := Component_Type (Tref);
1288 -- For other non-derived base types, nothing
1294 -- For a subtype, go to ancestor subtype
1297 Tref := Ancestor_Subtype (Tref);
1299 -- If no ancestor subtype, go to base type
1302 Tref := Base_Type (Sav);
1306 -- For objects, functions, enum literals, just get type from
1309 elsif Is_Object (Tref)
1310 or else Ekind (Tref) = E_Enumeration_Literal
1311 or else Ekind (Tref) = E_Function
1312 or else Ekind (Tref) = E_Operator
1314 Tref := Etype (Tref);
1316 -- For anything else, exit
1322 -- Exit if no type reference, or we are stuck in some loop trying
1323 -- to find the type reference, or if the type is standard void
1324 -- type (the latter is an implementation artifact that should not
1325 -- show up in the generated cross-references).
1329 or else Tref = Standard_Void_Type;
1331 -- If we have a usable type reference, return, otherwise keep
1332 -- looking for something useful (we are looking for something
1333 -- that either comes from source or standard)
1335 if Sloc (Tref) = Standard_Location
1336 or else Comes_From_Source (Tref)
1338 -- If the reference is a subtype created for a generic actual,
1339 -- go actual directly, the inner subtype is not user visible.
1341 if Nkind (Parent (Tref)) = N_Subtype_Declaration
1342 and then not Comes_From_Source (Parent (Tref))
1344 (Is_Wrapper_Package (Scope (Tref))
1345 or else Is_Generic_Instance (Scope (Tref)))
1347 Tref := First_Subtype (Base_Type (Tref));
1354 -- If we fall through the loop, no type reference
1359 end Get_Type_Reference;
1361 -------------------------------
1362 -- Output_Import_Export_Info --
1363 -------------------------------
1365 procedure Output_Import_Export_Info (Ent : Entity_Id) is
1366 Language_Name : Name_Id;
1367 Conv : constant Convention_Id := Convention (Ent);
1370 -- Generate language name from convention
1372 if Conv = Convention_C then
1373 Language_Name := Name_C;
1375 elsif Conv = Convention_CPP then
1376 Language_Name := Name_CPP;
1378 elsif Conv = Convention_Ada then
1379 Language_Name := Name_Ada;
1382 -- For the moment we ignore all other cases ???
1387 Write_Info_Char ('<');
1388 Get_Unqualified_Name_String (Language_Name);
1390 for J in 1 .. Name_Len loop
1391 Write_Info_Char (Name_Buffer (J));
1394 if Present (Interface_Name (Ent)) then
1395 Write_Info_Char (',');
1396 String_To_Name_Buffer (Strval (Interface_Name (Ent)));
1398 for J in 1 .. Name_Len loop
1399 Write_Info_Char (Name_Buffer (J));
1403 Write_Info_Char ('>');
1404 end Output_Import_Export_Info;
1406 -- Start of processing for Output_References
1409 -- First we add references to the primitive operations of tagged types
1410 -- declared in the main unit.
1412 Handle_Prim_Ops : declare
1416 for J in 1 .. Xrefs.Last loop
1417 Ent := Xrefs.Table (J).Key.Ent;
1420 and then Is_Tagged_Type (Ent)
1421 and then Is_Base_Type (Ent)
1422 and then In_Extended_Main_Source_Unit (Ent)
1424 Generate_Prim_Op_References (Ent);
1427 end Handle_Prim_Ops;
1429 -- Before we go ahead and output the references we have a problem
1430 -- that needs dealing with. So far we have captured things that are
1431 -- definitely referenced by the main unit, or defined in the main
1432 -- unit. That's because we don't want to clutter up the ali file
1433 -- for this unit with definition lines for entities in other units
1434 -- that are not referenced.
1436 -- But there is a glitch. We may reference an entity in another unit,
1437 -- and it may have a type reference to an entity that is not directly
1438 -- referenced in the main unit, which may mean that there is no xref
1439 -- entry for this entity yet in the list of references.
1441 -- If we don't do something about this, we will end with an orphan type
1442 -- reference, i.e. it will point to an entity that does not appear
1443 -- within the generated references in the ali file. That is not good for
1444 -- tools using the xref information.
1446 -- To fix this, we go through the references adding definition entries
1447 -- for any unreferenced entities that can be referenced in a type
1448 -- reference. There is a recursion problem here, and that is dealt with
1449 -- by making sure that this traversal also traverses any entries that
1450 -- get added by the traversal.
1452 Handle_Orphan_Type_References : declare
1458 pragma Warnings (Off, L);
1459 pragma Warnings (Off, R);
1461 procedure New_Entry (E : Entity_Id);
1462 -- Make an additional entry into the Xref table for a type entity
1463 -- that is related to the current entity (parent, type ancestor,
1464 -- progenitor, etc.).
1470 procedure New_Entry (E : Entity_Id) is
1472 pragma Assert (Present (E));
1474 if not Has_Xref_Entry (Implementation_Base_Type (E))
1475 and then Sloc (E) > No_Location
1480 Typ => Character'First,
1481 Eun => Get_Source_Unit (Original_Location (Sloc (E))),
1484 Ent_Scope => Empty),
1485 Ent_Scope_File => No_Unit);
1489 -- Start of processing for Handle_Orphan_Type_References
1492 -- Note that this is not a for loop for a very good reason. The
1493 -- processing of items in the table can add new items to the table,
1494 -- and they must be processed as well.
1497 while J <= Xrefs.Last loop
1498 Ent := Xrefs.Table (J).Key.Ent;
1499 Get_Type_Reference (Ent, Tref, L, R);
1502 and then not Has_Xref_Entry (Tref)
1503 and then Sloc (Tref) > No_Location
1507 if Is_Record_Type (Ent)
1508 and then Present (Interfaces (Ent))
1510 -- Add an entry for each one of the given interfaces
1511 -- implemented by type Ent.
1514 Elmt : Elmt_Id := First_Elmt (Interfaces (Ent));
1516 while Present (Elmt) loop
1517 New_Entry (Node (Elmt));
1524 -- Collect inherited primitive operations that may be declared in
1525 -- another unit and have no visible reference in the current one.
1528 and then Is_Tagged_Type (Ent)
1529 and then Is_Derived_Type (Ent)
1530 and then Is_Base_Type (Ent)
1531 and then In_Extended_Main_Source_Unit (Ent)
1534 Op_List : constant Elist_Id := Primitive_Operations (Ent);
1538 function Parent_Op (E : Entity_Id) return Entity_Id;
1539 -- Find original operation, which may be inherited through
1540 -- several derivations.
1542 function Parent_Op (E : Entity_Id) return Entity_Id is
1543 Orig_Op : constant Entity_Id := Alias (E);
1546 if No (Orig_Op) then
1549 elsif not Comes_From_Source (E)
1550 and then not Has_Xref_Entry (Orig_Op)
1551 and then Comes_From_Source (Orig_Op)
1555 return Parent_Op (Orig_Op);
1560 Op := First_Elmt (Op_List);
1561 while Present (Op) loop
1562 Prim := Parent_Op (Node (Op));
1564 if Present (Prim) then
1568 Typ => Character'First,
1569 Eun => Get_Source_Unit (Sloc (Prim)),
1572 Ent_Scope => Empty),
1573 Ent_Scope_File => No_Unit);
1583 end Handle_Orphan_Type_References;
1585 -- Now we have all the references, including those for any embedded
1586 -- type references, so we can sort them, and output them.
1588 Output_Refs : declare
1590 Nrefs : constant Nat := Xrefs.Last;
1591 -- Number of references in table
1593 Rnums : array (0 .. Nrefs) of Nat;
1594 -- This array contains numbers of references in the Xrefs table.
1595 -- This list is sorted in output order. The extra 0'th entry is
1596 -- convenient for the call to sort. When we sort the table, we
1597 -- move the entries in Rnums around, but we do not move the
1598 -- original table entries.
1600 Curxu : Unit_Number_Type;
1601 -- Current xref unit
1603 Curru : Unit_Number_Type;
1604 -- Current reference unit for one entity
1609 Curnam : String (1 .. Name_Buffer'Length);
1611 -- Simple name and length of current entity
1613 Curdef : Source_Ptr;
1614 -- Original source location for current entity
1617 -- Current reference location
1620 -- Entity type character
1623 -- reference kind of previous reference
1629 -- Renaming reference
1631 Trunit : Unit_Number_Type;
1632 -- Unit number for type reference
1634 function Lt (Op1, Op2 : Natural) return Boolean;
1635 -- Comparison function for Sort call
1637 function Name_Change (X : Entity_Id) return Boolean;
1638 -- Determines if entity X has a different simple name from Curent
1640 procedure Move (From : Natural; To : Natural);
1641 -- Move procedure for Sort call
1643 package Sorting is new GNAT.Heap_Sort_G (Move, Lt);
1649 function Lt (Op1, Op2 : Natural) return Boolean is
1650 T1 : Xref_Entry renames Xrefs.Table (Rnums (Nat (Op1)));
1651 T2 : Xref_Entry renames Xrefs.Table (Rnums (Nat (Op2)));
1661 procedure Move (From : Natural; To : Natural) is
1663 Rnums (Nat (To)) := Rnums (Nat (From));
1670 -- Why a string comparison here??? Why not compare Name_Id values???
1672 function Name_Change (X : Entity_Id) return Boolean is
1674 Get_Unqualified_Name_String (Chars (X));
1676 if Name_Len /= Curlen then
1679 return Name_Buffer (1 .. Curlen) /= Curnam (1 .. Curlen);
1683 -- Start of processing for Output_Refs
1686 -- Capture the definition Sloc values. We delay doing this till now,
1687 -- since at the time the reference or definition is made, private
1688 -- types may be swapped, and the Sloc value may be incorrect. We
1689 -- also set up the pointer vector for the sort.
1691 for J in 1 .. Nrefs loop
1693 Xrefs.Table (J).Def :=
1694 Original_Location (Sloc (Xrefs.Table (J).Key.Ent));
1697 -- Sort the references
1699 Sorting.Sort (Integer (Nrefs));
1701 -- Initialize loop through references
1705 Curdef := No_Location;
1707 Crloc := No_Location;
1710 -- Loop to output references
1712 for Refno in 1 .. Nrefs loop
1713 Output_One_Ref : declare
1716 XE : Xref_Entry renames Xrefs.Table (Rnums (Refno));
1717 -- The current entry to be accessed
1721 -- Used for {} or <> or () for type reference
1723 procedure Check_Type_Reference
1725 List_Interface : Boolean);
1726 -- Find whether there is a meaningful type reference for
1727 -- Ent, and display it accordingly. If List_Interface is
1728 -- true, then Ent is a progenitor interface of the current
1729 -- type entity being listed. In that case list it as is,
1730 -- without looking for a type reference for it.
1732 procedure Output_Instantiation_Refs (Loc : Source_Ptr);
1733 -- Recursive procedure to output instantiation references for
1734 -- the given source ptr in [file|line[...]] form. No output
1735 -- if the given location is not a generic template reference.
1737 procedure Output_Overridden_Op (Old_E : Entity_Id);
1738 -- For a subprogram that is overriding, display information
1739 -- about the inherited operation that it overrides.
1741 --------------------------
1742 -- Check_Type_Reference --
1743 --------------------------
1745 procedure Check_Type_Reference
1747 List_Interface : Boolean)
1750 if List_Interface then
1752 -- This is a progenitor interface of the type for which
1753 -- xref information is being generated.
1760 Get_Type_Reference (Ent, Tref, Left, Right);
1763 if Present (Tref) then
1765 -- Case of standard entity, output name
1767 if Sloc (Tref) = Standard_Location then
1768 Write_Info_Char (Left);
1769 Write_Info_Name (Chars (Tref));
1770 Write_Info_Char (Right);
1772 -- Case of source entity, output location
1775 Write_Info_Char (Left);
1776 Trunit := Get_Source_Unit (Sloc (Tref));
1778 if Trunit /= Curxu then
1779 Write_Info_Nat (Dependency_Num (Trunit));
1780 Write_Info_Char ('|');
1784 (Int (Get_Logical_Line_Number (Sloc (Tref))));
1792 Ctyp := Xref_Entity_Letters (Ekind (Ent));
1795 and then Present (Full_View (Ent))
1797 Ent := Underlying_Type (Ent);
1799 if Present (Ent) then
1800 Ctyp := Xref_Entity_Letters (Ekind (Ent));
1804 Write_Info_Char (Ctyp);
1808 (Int (Get_Column_Number (Sloc (Tref))));
1810 -- If the type comes from an instantiation, add the
1811 -- corresponding info.
1813 Output_Instantiation_Refs (Sloc (Tref));
1814 Write_Info_Char (Right);
1817 end Check_Type_Reference;
1819 -------------------------------
1820 -- Output_Instantiation_Refs --
1821 -------------------------------
1823 procedure Output_Instantiation_Refs (Loc : Source_Ptr) is
1824 Iloc : constant Source_Ptr := Instantiation_Location (Loc);
1825 Lun : Unit_Number_Type;
1826 Cu : constant Unit_Number_Type := Curru;
1829 -- Nothing to do if this is not an instantiation
1831 if Iloc = No_Location then
1835 -- Output instantiation reference
1837 Write_Info_Char ('[');
1838 Lun := Get_Source_Unit (Iloc);
1840 if Lun /= Curru then
1842 Write_Info_Nat (Dependency_Num (Curru));
1843 Write_Info_Char ('|');
1846 Write_Info_Nat (Int (Get_Logical_Line_Number (Iloc)));
1848 -- Recursive call to get nested instantiations
1850 Output_Instantiation_Refs (Iloc);
1852 -- Output final ] after call to get proper nesting
1854 Write_Info_Char (']');
1857 end Output_Instantiation_Refs;
1859 --------------------------
1860 -- Output_Overridden_Op --
1861 --------------------------
1863 procedure Output_Overridden_Op (Old_E : Entity_Id) is
1867 -- The overridden operation has an implicit declaration
1868 -- at the point of derivation. What we want to display
1869 -- is the original operation, which has the actual body
1870 -- (or abstract declaration) that is being overridden.
1871 -- The overridden operation is not always set, e.g. when
1872 -- it is a predefined operator.
1877 -- Follow alias chain if one is present
1879 elsif Present (Alias (Old_E)) then
1881 -- The subprogram may have been implicitly inherited
1882 -- through several levels of derivation, so find the
1883 -- ultimate (source) ancestor.
1885 Op := Ultimate_Alias (Old_E);
1887 -- Normal case of no alias present
1894 and then Sloc (Op) /= Standard_Location
1897 Loc : constant Source_Ptr := Sloc (Op);
1898 Par_Unit : constant Unit_Number_Type :=
1899 Get_Source_Unit (Loc);
1902 Write_Info_Char ('<');
1904 if Par_Unit /= Curxu then
1905 Write_Info_Nat (Dependency_Num (Par_Unit));
1906 Write_Info_Char ('|');
1909 Write_Info_Nat (Int (Get_Logical_Line_Number (Loc)));
1910 Write_Info_Char ('p');
1911 Write_Info_Nat (Int (Get_Column_Number (Loc)));
1912 Write_Info_Char ('>');
1915 end Output_Overridden_Op;
1917 -- Start of processing for Output_One_Ref
1921 Ctyp := Xref_Entity_Letters (Ekind (Ent));
1923 -- Skip reference if it is the only reference to an entity,
1924 -- and it is an END line reference, and the entity is not in
1925 -- the current extended source. This prevents junk entries
1926 -- consisting only of packages with END lines, where no
1927 -- entity from the package is actually referenced.
1930 and then Ent /= Curent
1931 and then (Refno = Nrefs
1933 Ent /= Xrefs.Table (Rnums (Refno + 1)).Key.Ent)
1934 and then not In_Extended_Main_Source_Unit (Ent)
1939 -- For private type, get full view type
1942 and then Present (Full_View (XE.Key.Ent))
1944 Ent := Underlying_Type (Ent);
1946 if Present (Ent) then
1947 Ctyp := Xref_Entity_Letters (Ekind (Ent));
1951 -- Special exception for Boolean
1953 if Ctyp = 'E' and then Is_Boolean_Type (Ent) then
1957 -- For variable reference, get corresponding type
1960 Ent := Etype (XE.Key.Ent);
1961 Ctyp := Fold_Lower (Xref_Entity_Letters (Ekind (Ent)));
1963 -- If variable is private type, get full view type
1966 and then Present (Full_View (Etype (XE.Key.Ent)))
1968 Ent := Underlying_Type (Etype (XE.Key.Ent));
1970 if Present (Ent) then
1971 Ctyp := Fold_Lower (Xref_Entity_Letters (Ekind (Ent)));
1974 elsif Is_Generic_Type (Ent) then
1976 -- If the type of the entity is a generic private type,
1977 -- there is no usable full view, so retain the indication
1978 -- that this is an object.
1983 -- Special handling for access parameters and objects of
1984 -- an anonymous access type.
1986 if Ekind_In (Etype (XE.Key.Ent),
1987 E_Anonymous_Access_Type,
1988 E_Anonymous_Access_Subprogram_Type,
1989 E_Anonymous_Access_Protected_Subprogram_Type)
1991 if Is_Formal (XE.Key.Ent)
1992 or else Ekind_In (XE.Key.Ent, E_Variable, E_Constant)
1997 -- Special handling for Boolean
1999 elsif Ctyp = 'e' and then Is_Boolean_Type (Ent) then
2004 -- Special handling for abstract types and operations
2006 if Is_Overloadable (XE.Key.Ent)
2007 and then Is_Abstract_Subprogram (XE.Key.Ent)
2010 Ctyp := 'x'; -- Abstract procedure
2012 elsif Ctyp = 'V' then
2013 Ctyp := 'y'; -- Abstract function
2016 elsif Is_Type (XE.Key.Ent)
2017 and then Is_Abstract_Type (XE.Key.Ent)
2019 if Is_Interface (XE.Key.Ent) then
2022 elsif Ctyp = 'R' then
2023 Ctyp := 'H'; -- Abstract type
2027 -- Only output reference if interesting type of entity
2031 -- Suppress references to object definitions, used for local
2034 or else XE.Key.Typ = 'D'
2035 or else XE.Key.Typ = 'I'
2037 -- Suppress self references, except for bodies that act as
2040 or else (XE.Key.Loc = XE.Def
2043 or else not Is_Subprogram (XE.Key.Ent)))
2045 -- Also suppress definitions of body formals (we only
2046 -- treat these as references, and the references were
2047 -- separately recorded).
2049 or else (Is_Formal (XE.Key.Ent)
2050 and then Present (Spec_Entity (XE.Key.Ent)))
2055 -- Start new Xref section if new xref unit
2057 if XE.Key.Eun /= Curxu then
2058 if Write_Info_Col > 1 then
2062 Curxu := XE.Key.Eun;
2064 Write_Info_Initiate ('X');
2065 Write_Info_Char (' ');
2066 Write_Info_Nat (Dependency_Num (XE.Key.Eun));
2067 Write_Info_Char (' ');
2069 (Reference_Name (Source_Index (XE.Key.Eun)));
2072 -- Start new Entity line if new entity. Note that we
2073 -- consider two entities the same if they have the same
2074 -- name and source location. This causes entities in
2075 -- instantiations to be treated as though they referred
2080 (XE.Key.Ent /= Curent
2082 (Name_Change (XE.Key.Ent) or else XE.Def /= Curdef))
2084 Curent := XE.Key.Ent;
2087 Get_Unqualified_Name_String (Chars (XE.Key.Ent));
2089 Curnam (1 .. Curlen) := Name_Buffer (1 .. Curlen);
2091 if Write_Info_Col > 1 then
2095 -- Write column number information
2097 Write_Info_Nat (Int (Get_Logical_Line_Number (XE.Def)));
2098 Write_Info_Char (Ctyp);
2099 Write_Info_Nat (Int (Get_Column_Number (XE.Def)));
2101 -- Write level information
2103 Write_Level_Info : declare
2104 function Is_Visible_Generic_Entity
2105 (E : Entity_Id) return Boolean;
2106 -- Check whether E is declared in the visible part
2107 -- of a generic package. For source navigation
2108 -- purposes, treat this as a visible entity.
2110 function Is_Private_Record_Component
2111 (E : Entity_Id) return Boolean;
2112 -- Check whether E is a non-inherited component of a
2113 -- private extension. Even if the enclosing record is
2114 -- public, we want to treat the component as private
2115 -- for navigation purposes.
2117 ---------------------------------
2118 -- Is_Private_Record_Component --
2119 ---------------------------------
2121 function Is_Private_Record_Component
2122 (E : Entity_Id) return Boolean
2124 S : constant Entity_Id := Scope (E);
2127 Ekind (E) = E_Component
2128 and then Nkind (Declaration_Node (S)) =
2129 N_Private_Extension_Declaration
2130 and then Original_Record_Component (E) = E;
2131 end Is_Private_Record_Component;
2133 -------------------------------
2134 -- Is_Visible_Generic_Entity --
2135 -------------------------------
2137 function Is_Visible_Generic_Entity
2138 (E : Entity_Id) return Boolean
2143 -- The Present check here is an error defense
2145 if Present (Scope (E))
2146 and then Ekind (Scope (E)) /= E_Generic_Package
2152 while Present (Par) loop
2154 Nkind (Par) = N_Generic_Package_Declaration
2156 -- Entity is a generic formal
2161 Nkind (Parent (Par)) = N_Package_Specification
2164 Is_List_Member (Par)
2165 and then List_Containing (Par) =
2166 Visible_Declarations (Parent (Par));
2168 Par := Parent (Par);
2173 end Is_Visible_Generic_Entity;
2175 -- Start of processing for Write_Level_Info
2178 if Is_Hidden (Curent)
2179 or else Is_Private_Record_Component (Curent)
2181 Write_Info_Char (' ');
2185 or else Is_Visible_Generic_Entity (Curent)
2187 Write_Info_Char ('*');
2190 Write_Info_Char (' ');
2192 end Write_Level_Info;
2194 -- Output entity name. We use the occurrence from the
2195 -- actual source program at the definition point.
2198 Ent_Name : constant String :=
2199 Exact_Source_Name (Sloc (XE.Key.Ent));
2201 for C in Ent_Name'Range loop
2202 Write_Info_Char (Ent_Name (C));
2206 -- See if we have a renaming reference
2208 if Is_Object (XE.Key.Ent)
2209 and then Present (Renamed_Object (XE.Key.Ent))
2211 Rref := Renamed_Object (XE.Key.Ent);
2213 elsif Is_Overloadable (XE.Key.Ent)
2214 and then Nkind (Parent (Declaration_Node (XE.Key.Ent)))
2215 = N_Subprogram_Renaming_Declaration
2217 Rref := Name (Parent (Declaration_Node (XE.Key.Ent)));
2219 elsif Ekind (XE.Key.Ent) = E_Package
2220 and then Nkind (Declaration_Node (XE.Key.Ent)) =
2221 N_Package_Renaming_Declaration
2223 Rref := Name (Declaration_Node (XE.Key.Ent));
2229 if Present (Rref) then
2230 if Nkind (Rref) = N_Expanded_Name then
2231 Rref := Selector_Name (Rref);
2234 if Nkind (Rref) = N_Identifier
2235 or else Nkind (Rref) = N_Operator_Symbol
2239 -- For renamed array components, use the array name
2240 -- for the renamed entity, which reflect the fact that
2241 -- in general the whole array is aliased.
2243 elsif Nkind (Rref) = N_Indexed_Component then
2244 if Nkind (Prefix (Rref)) = N_Identifier then
2245 Rref := Prefix (Rref);
2246 elsif Nkind (Prefix (Rref)) = N_Expanded_Name then
2247 Rref := Selector_Name (Prefix (Rref));
2257 -- Write out renaming reference if we have one
2259 if Present (Rref) then
2260 Write_Info_Char ('=');
2262 (Int (Get_Logical_Line_Number (Sloc (Rref))));
2263 Write_Info_Char (':');
2265 (Int (Get_Column_Number (Sloc (Rref))));
2268 -- Indicate that the entity is in the unit of the current
2273 -- Write out information about generic parent, if entity
2276 if Is_Generic_Instance (XE.Key.Ent) then
2278 Gen_Par : constant Entity_Id :=
2281 (Unit_Declaration_Node
2283 Loc : constant Source_Ptr := Sloc (Gen_Par);
2284 Gen_U : constant Unit_Number_Type :=
2285 Get_Source_Unit (Loc);
2288 Write_Info_Char ('[');
2290 if Curru /= Gen_U then
2291 Write_Info_Nat (Dependency_Num (Gen_U));
2292 Write_Info_Char ('|');
2296 (Int (Get_Logical_Line_Number (Loc)));
2297 Write_Info_Char (']');
2301 -- See if we have a type reference and if so output
2303 Check_Type_Reference (XE.Key.Ent, False);
2305 -- Additional information for types with progenitors
2307 if Is_Record_Type (XE.Key.Ent)
2308 and then Present (Interfaces (XE.Key.Ent))
2312 First_Elmt (Interfaces (XE.Key.Ent));
2314 while Present (Elmt) loop
2315 Check_Type_Reference (Node (Elmt), True);
2320 -- For array types, list index types as well. (This is
2321 -- not C, indexes have distinct types).
2323 elsif Is_Array_Type (XE.Key.Ent) then
2327 Indx := First_Index (XE.Key.Ent);
2328 while Present (Indx) loop
2329 Check_Type_Reference
2330 (First_Subtype (Etype (Indx)), True);
2336 -- If the entity is an overriding operation, write info
2337 -- on operation that was overridden.
2339 if Is_Subprogram (XE.Key.Ent)
2340 and then Present (Overridden_Operation (XE.Key.Ent))
2342 Output_Overridden_Op
2343 (Overridden_Operation (XE.Key.Ent));
2346 -- End of processing for entity output
2348 Crloc := No_Location;
2351 -- Output the reference if it is not as the same location
2352 -- as the previous one, or it is a read-reference that
2353 -- indicates that the entity is an in-out actual in a call.
2355 if XE.Key.Loc /= No_Location
2357 (XE.Key.Loc /= Crloc
2358 or else (Prevt = 'm' and then XE.Key.Typ = 'r'))
2360 Crloc := XE.Key.Loc;
2361 Prevt := XE.Key.Typ;
2363 -- Start continuation if line full, else blank
2365 if Write_Info_Col > 72 then
2367 Write_Info_Initiate ('.');
2370 Write_Info_Char (' ');
2372 -- Output file number if changed
2374 if XE.Key.Lun /= Curru then
2375 Curru := XE.Key.Lun;
2376 Write_Info_Nat (Dependency_Num (Curru));
2377 Write_Info_Char ('|');
2381 (Int (Get_Logical_Line_Number (XE.Key.Loc)));
2382 Write_Info_Char (XE.Key.Typ);
2384 if Is_Overloadable (XE.Key.Ent)
2385 and then Is_Imported (XE.Key.Ent)
2386 and then XE.Key.Typ = 'b'
2388 Output_Import_Export_Info (XE.Key.Ent);
2391 Write_Info_Nat (Int (Get_Column_Number (XE.Key.Loc)));
2393 Output_Instantiation_Refs (Sloc (XE.Key.Ent));
2404 end Output_References;
2407 -- Reset is necessary because Elmt_Ptr does not default to Null_Ptr,
2408 -- because it's not an access type.