1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1998-2013, 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 SPARK 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 -- SPARK Xrefs Information --
156 -----------------------------
158 package body SPARK_Specific is separate;
160 ------------------------
161 -- Local Subprograms --
162 ------------------------
164 procedure Add_Entry (Key : Xref_Key; Ent_Scope_File : Unit_Number_Type);
165 -- Add an entry to the tables of Xref_Entries, avoiding duplicates
167 procedure Generate_Prim_Op_References (Typ : Entity_Id);
168 -- For a tagged type, generate implicit references to its primitive
169 -- operations, for source navigation. This is done right before emitting
170 -- cross-reference information rather than at the freeze point of the type
171 -- in order to handle late bodies that are primitive operations.
173 function Lt (T1, T2 : Xref_Entry) return Boolean;
174 -- Order cross-references
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)
376 Actual_Typ : Character := Typ;
380 Ent_Scope : Entity_Id;
385 Ref_Scope : Entity_Id;
387 function Get_Through_Renamings (E : Entity_Id) return Entity_Id;
388 -- Get the enclosing entity through renamings, which may come from
389 -- source or from the translation of generic instantiations.
391 function Is_On_LHS (Node : Node_Id) return Boolean;
392 -- Used to check if a node is on the left hand side of an assignment.
393 -- The following cases are handled:
395 -- Variable Node is a direct descendant of left hand side of an
396 -- assignment statement.
398 -- Prefix Of an indexed or selected component that is present in
399 -- a subtree rooted by an assignment statement. There is
400 -- no restriction of nesting of components, thus cases
401 -- such as A.B (C).D are handled properly. However a prefix
402 -- of a dereference (either implicit or explicit) is never
403 -- considered as on a LHS.
405 -- Out param Same as above cases, but OUT parameter
407 function OK_To_Set_Referenced return Boolean;
408 -- Returns True if the Referenced flag can be set. There are a few
409 -- exceptions where we do not want to set this flag, see body for
410 -- details of these exceptional cases.
412 ---------------------------
413 -- Get_Through_Renamings --
414 ---------------------------
416 function Get_Through_Renamings (E : Entity_Id) return Entity_Id is
417 Result : Entity_Id := E;
419 while Present (Result)
420 and then Is_Object (Result)
421 and then Present (Renamed_Object (Result))
423 Result := Get_Enclosing_Object (Renamed_Object (Result));
426 end Get_Through_Renamings;
432 -- ??? There are several routines here and there that perform a similar
433 -- (but subtly different) computation, which should be factored:
436 -- Sem_Util.May_Be_Lvalue
437 -- Sem_Util.Known_To_Be_Assigned
438 -- Exp_Ch2.Expand_Entry_Parameter.In_Assignment_Context
439 -- Exp_Smem.Is_Out_Actual
441 function Is_On_LHS (Node : Node_Id) return Boolean is
447 -- Only identifiers are considered, is this necessary???
449 if Nkind (Node) /= N_Identifier then
453 -- Immediate return if appeared as OUT parameter
455 if Kind = E_Out_Parameter then
459 -- Search for assignment statement subtree root
466 if K = N_Assignment_Statement then
469 -- Check whether the parent is a component and the current node is
470 -- its prefix, but return False if the current node has an access
471 -- type, as in that case the selected or indexed component is an
472 -- implicit dereference, and the LHS is the designated object, not
473 -- the access object.
475 -- ??? case of a slice assignment?
477 elsif (K = N_Selected_Component or else K = N_Indexed_Component)
478 and then Prefix (P) = N
480 -- Check for access type. First a kludge, In some cases this is
481 -- called too early (see comments in Sem_Ch8.Find_Direct_Name),
482 -- at a point where the tree is not fully typed yet. In that
483 -- case we may lack an Etype for N, and we can't check the
484 -- Etype. For now, we always return False in such a case,
485 -- but this is clearly not right in all cases ???
487 if No (Etype (N)) then
490 elsif Is_Access_Type (Etype (N)) then
493 -- Access type case dealt with, keep going
499 -- All other cases, definitely not on left side
507 ---------------------------
508 -- OK_To_Set_Referenced --
509 ---------------------------
511 function OK_To_Set_Referenced return Boolean is
515 -- A reference from a pragma Unreferenced or pragma Unmodified or
516 -- pragma Warnings does not cause the Referenced flag to be set.
517 -- This avoids silly warnings about things being referenced and
518 -- not assigned when the only reference is from the pragma.
520 if Nkind (N) = N_Identifier then
523 if Nkind (P) = N_Pragma_Argument_Association then
526 if Nkind (P) = N_Pragma then
527 if Nam_In (Pragma_Name (P), Name_Warnings,
535 -- A reference to a formal in a named parameter association does
536 -- not make the formal referenced. Formals that are unused in the
537 -- subprogram body are properly flagged as such, even if calls
538 -- elsewhere use named notation.
540 elsif Nkind (P) = N_Parameter_Association
541 and then N = Selector_Name (P)
548 end OK_To_Set_Referenced;
550 -- Start of processing for Generate_Reference
553 pragma Assert (Nkind (E) in N_Entity);
554 Find_Actual (N, Formal, Call);
556 if Present (Formal) then
557 Kind := Ekind (Formal);
562 -- Check for obsolescent reference to package ASCII. GNAT treats this
563 -- element of annex J specially since in practice, programs make a lot
564 -- of use of this feature, so we don't include it in the set of features
565 -- diagnosed when Warn_On_Obsolescent_Features mode is set. However we
566 -- are required to note it as a violation of the RM defined restriction.
568 if E = Standard_ASCII then
569 Check_Restriction (No_Obsolescent_Features, N);
572 -- Check for reference to entity marked with Is_Obsolescent
574 -- Note that we always allow obsolescent references in the compiler
575 -- itself and the run time, since we assume that we know what we are
576 -- doing in such cases. For example the calls in Ada.Characters.Handling
577 -- to its own obsolescent subprograms are just fine.
579 -- In any case we only generate warnings if we are in the extended main
580 -- source unit, and the entity itself is not in the extended main source
581 -- unit, since we assume the source unit itself knows what is going on
582 -- (and for sure we do not want silly warnings, e.g. on the end line of
583 -- an obsolescent procedure body).
585 if Is_Obsolescent (E)
586 and then not GNAT_Mode
587 and then not In_Extended_Main_Source_Unit (E)
588 and then In_Extended_Main_Source_Unit (N)
590 Check_Restriction (No_Obsolescent_Features, N);
592 if Warn_On_Obsolescent_Feature then
593 Output_Obsolescent_Entity_Warnings (N, E);
597 -- Warn if reference to Ada 2005 entity not in Ada 2005 mode. We only
598 -- detect real explicit references (modifications and references).
600 if Comes_From_Source (N)
601 and then Is_Ada_2005_Only (E)
602 and then Ada_Version < Ada_2005
603 and then Warn_On_Ada_2005_Compatibility
604 and then (Typ = 'm' or else Typ = 'r' or else Typ = 's')
606 Error_Msg_NE ("& is only defined in Ada 2005?y?", N, E);
609 -- Warn if reference to Ada 2012 entity not in Ada 2012 mode. We only
610 -- detect real explicit references (modifications and references).
612 if Comes_From_Source (N)
613 and then Is_Ada_2012_Only (E)
614 and then Ada_Version < Ada_2012
615 and then Warn_On_Ada_2012_Compatibility
616 and then (Typ = 'm' or else Typ = 'r')
618 Error_Msg_NE ("& is only defined in Ada 2012?y?", N, E);
621 -- Do not generate references if we are within a postcondition sub-
622 -- program, because the reference does not comes from source, and the
623 -- pre-analysis of the aspect has already created an entry for the ali
624 -- file at the proper source location.
626 if Chars (Current_Scope) = Name_uPostconditions then
630 -- Never collect references if not in main source unit. However, we omit
631 -- this test if Typ is 'e' or 'k', since these entries are structural,
632 -- and it is useful to have them in units that reference packages as
633 -- well as units that define packages. We also omit the test for the
634 -- case of 'p' since we want to include inherited primitive operations
635 -- from other packages.
637 -- We also omit this test is this is a body reference for a subprogram
638 -- instantiation. In this case the reference is to the generic body,
639 -- which clearly need not be in the main unit containing the instance.
640 -- For the same reason we accept an implicit reference generated for
641 -- a default in an instance.
643 if not In_Extended_Main_Source_Unit (N) then
649 or else (Typ = 'b' and then Is_Generic_Instance (E))
651 -- Allow the generation of references to reads, writes and calls
652 -- in SPARK mode when the related context comes from an instance.
656 and then In_Extended_Main_Code_Unit (N)
657 and then (Typ = 'm' or else Typ = 'r' or else Typ = 's'))
665 -- For reference type p, the entity must be in main source unit
667 if Typ = 'p' and then not In_Extended_Main_Source_Unit (E) then
671 -- Unless the reference is forced, we ignore references where the
672 -- reference itself does not come from source.
674 if not Force and then not Comes_From_Source (N) then
678 -- Deal with setting entity as referenced, unless suppressed. Note that
679 -- we still do Set_Referenced on entities that do not come from source.
680 -- This situation arises when we have a source reference to a derived
681 -- operation, where the derived operation itself does not come from
682 -- source, but we still want to mark it as referenced, since we really
683 -- are referencing an entity in the corresponding package (this avoids
684 -- wrong complaints that the package contains no referenced entities).
688 -- Assignable object appearing on left side of assignment or as
692 and then Is_On_LHS (N)
693 and then Ekind (E) /= E_In_Out_Parameter
695 -- For objects that are renamings, just set as simply referenced
696 -- we do not try to do assignment type tracking in this case.
698 if Present (Renamed_Object (E)) then
701 -- Out parameter case
703 elsif Kind = E_Out_Parameter then
705 -- If warning mode for all out parameters is set, or this is
706 -- the only warning parameter, then we want to mark this for
707 -- later warning logic by setting Referenced_As_Out_Parameter
709 if Warn_On_Modified_As_Out_Parameter (Formal) then
710 Set_Referenced_As_Out_Parameter (E, True);
711 Set_Referenced_As_LHS (E, False);
713 -- For OUT parameter not covered by the above cases, we simply
714 -- regard it as a normal reference (in this case we do not
715 -- want any of the warning machinery for out parameters).
721 -- For the left hand of an assignment case, we do nothing here.
722 -- The processing for Analyze_Assignment_Statement will set the
723 -- Referenced_As_LHS flag.
729 -- Check for a reference in a pragma that should not count as a
730 -- making the variable referenced for warning purposes.
732 elsif Is_Non_Significant_Pragma_Reference (N) then
735 -- A reference in an attribute definition clause does not count as a
736 -- reference except for the case of Address. The reason that 'Address
737 -- is an exception is that it creates an alias through which the
738 -- variable may be referenced.
740 elsif Nkind (Parent (N)) = N_Attribute_Definition_Clause
741 and then Chars (Parent (N)) /= Name_Address
742 and then N = Name (Parent (N))
746 -- Constant completion does not count as a reference
749 and then Ekind (E) = E_Constant
753 -- Record representation clause does not count as a reference
755 elsif Nkind (N) = N_Identifier
756 and then Nkind (Parent (N)) = N_Record_Representation_Clause
760 -- Discriminants do not need to produce a reference to record type
763 and then Nkind (Parent (N)) = N_Discriminant_Specification
770 -- Special processing for IN OUT parameters, where we have an
771 -- implicit assignment to a simple variable.
773 if Kind = E_In_Out_Parameter
774 and then Is_Assignable (E)
776 -- For sure this counts as a normal read reference
779 Set_Last_Assignment (E, Empty);
781 -- We count it as being referenced as an out parameter if the
782 -- option is set to warn on all out parameters, except that we
783 -- have a special exclusion for an intrinsic subprogram, which
784 -- is most likely an instantiation of Unchecked_Deallocation
785 -- which we do not want to consider as an assignment since it
786 -- generates false positives. We also exclude the case of an
787 -- IN OUT parameter if the name of the procedure is Free,
788 -- since we suspect similar semantics.
790 if Warn_On_All_Unread_Out_Parameters
791 and then Is_Entity_Name (Name (Call))
792 and then not Is_Intrinsic_Subprogram (Entity (Name (Call)))
793 and then Chars (Name (Call)) /= Name_Free
795 Set_Referenced_As_Out_Parameter (E, True);
796 Set_Referenced_As_LHS (E, False);
799 -- Don't count a recursive reference within a subprogram as a
800 -- reference (that allows detection of a recursive subprogram
801 -- whose only references are recursive calls as unreferenced).
803 elsif Is_Subprogram (E)
804 and then E = Nearest_Dynamic_Scope (Current_Scope)
808 -- Any other occurrence counts as referencing the entity
810 elsif OK_To_Set_Referenced then
813 -- If variable, this is an OK reference after an assignment
814 -- so we can clear the Last_Assignment indication.
816 if Is_Assignable (E) then
817 Set_Last_Assignment (E, Empty);
822 -- Check for pragma Unreferenced given and reference is within
823 -- this source unit (occasion for possible warning to be issued).
825 if Has_Unreferenced (E)
826 and then In_Same_Extended_Unit (E, N)
828 -- A reference as a named parameter in a call does not count
829 -- as a violation of pragma Unreferenced for this purpose...
831 if Nkind (N) = N_Identifier
832 and then Nkind (Parent (N)) = N_Parameter_Association
833 and then Selector_Name (Parent (N)) = N
837 -- ... Neither does a reference to a variable on the left side
840 elsif Is_On_LHS (N) then
843 -- For entry formals, we want to place the warning message on the
844 -- corresponding entity in the accept statement. The current scope
845 -- is the body of the accept, so we find the formal whose name
846 -- matches that of the entry formal (there is no link between the
847 -- two entities, and the one in the accept statement is only used
848 -- for conformance checking).
850 elsif Ekind (Scope (E)) = E_Entry then
855 BE := First_Entity (Current_Scope);
856 while Present (BE) loop
857 if Chars (BE) = Chars (E) then
858 Error_Msg_NE -- CODEFIX
859 ("??pragma Unreferenced given for&!", N, BE);
867 -- Here we issue the warning, since this is a real reference
870 Error_Msg_NE -- CODEFIX
871 ("?pragma Unreferenced given for&!", N, E);
875 -- If this is a subprogram instance, mark as well the internal
876 -- subprogram in the wrapper package, which may be a visible
879 if Is_Overloadable (E)
880 and then Is_Generic_Instance (E)
881 and then Present (Alias (E))
883 Set_Referenced (Alias (E));
887 -- Generate reference if all conditions are met:
890 -- Cross referencing must be active
894 -- The entity must be one for which we collect references
896 and then Xref_Entity_Letters (Ekind (E)) /= ' '
898 -- Both Sloc values must be set to something sensible
900 and then Sloc (E) > No_Location
901 and then Sloc (N) > No_Location
903 -- Ignore references from within an instance. The only exceptions to
904 -- this are default subprograms, for which we generate an implicit
905 -- reference and compilations in SPARK mode.
908 (Instantiation_Location (Sloc (N)) = No_Location
910 or else GNATprove_Mode)
912 -- Ignore dummy references
916 if Nkind_In (N, N_Identifier,
917 N_Defining_Identifier,
918 N_Defining_Operator_Symbol,
920 N_Defining_Character_Literal)
921 or else Nkind (N) in N_Op
922 or else (Nkind (N) = N_Character_Literal
923 and then Sloc (Entity (N)) /= Standard_Location)
927 elsif Nkind_In (N, N_Expanded_Name, N_Selected_Component) then
928 Nod := Selector_Name (N);
934 -- Normal case of source entity comes from source
936 if Comes_From_Source (E) then
939 -- Entity does not come from source, but is a derived subprogram and
940 -- the derived subprogram comes from source (after one or more
941 -- derivations) in which case the reference is to parent subprogram.
943 elsif Is_Overloadable (E)
944 and then Present (Alias (E))
947 while not Comes_From_Source (Ent) loop
948 if No (Alias (Ent)) then
955 -- The internally created defining entity for a child subprogram
956 -- that has no previous spec has valid references.
958 elsif Is_Overloadable (E)
959 and then Is_Child_Unit (E)
963 -- Ditto for the formals of such a subprogram
965 elsif Is_Overloadable (Scope (E))
966 and then Is_Child_Unit (Scope (E))
970 -- Record components of discriminated subtypes or derived types must
971 -- be treated as references to the original component.
973 elsif Ekind (E) = E_Component
974 and then Comes_From_Source (Original_Record_Component (E))
976 Ent := Original_Record_Component (E);
978 -- If this is an expanded reference to a discriminant, recover the
979 -- original discriminant, which gets the reference.
981 elsif Ekind (E) = E_In_Parameter
982 and then Present (Discriminal_Link (E))
984 Ent := Discriminal_Link (E);
985 Set_Referenced (Ent);
987 -- Ignore reference to any other entity that is not from source
993 -- In SPARK mode, consider the underlying entity renamed instead of
994 -- the renaming, which is needed to compute a valid set of effects
995 -- (reads, writes) for the enclosing subprogram.
997 if GNATprove_Mode then
998 Ent := Get_Through_Renamings (Ent);
1000 -- If no enclosing object, then it could be a reference to any
1001 -- location not tracked individually, like heap-allocated data.
1002 -- Conservatively approximate this possibility by generating a
1003 -- dereference, and return.
1006 if Actual_Typ = 'w' then
1007 SPARK_Specific.Generate_Dereference (Nod, 'r');
1008 SPARK_Specific.Generate_Dereference (Nod, 'w');
1010 SPARK_Specific.Generate_Dereference (Nod, 'r');
1017 -- Record reference to entity
1020 and then Is_Subprogram (Nod)
1021 and then Present (Overridden_Operation (Nod))
1026 -- Comment needed here for special SPARK code ???
1028 if GNATprove_Mode then
1032 Ref_Scope := SPARK_Specific.Enclosing_Subprogram_Or_Package (Nod);
1033 Ent_Scope := SPARK_Specific.Enclosing_Subprogram_Or_Package (Ent);
1035 -- Since we are reaching through renamings in SPARK mode, we may
1036 -- end up with standard constants. Ignore those.
1038 if Sloc (Ent_Scope) <= Standard_Location
1039 or else Def <= Standard_Location
1048 Eun => Get_Code_Unit (Def),
1049 Lun => Get_Code_Unit (Ref),
1050 Ref_Scope => Ref_Scope,
1051 Ent_Scope => Ent_Scope),
1052 Ent_Scope_File => Get_Code_Unit (Ent));
1055 Ref := Original_Location (Sloc (Nod));
1056 Def := Original_Location (Sloc (Ent));
1058 -- If this is an operator symbol, skip the initial quote for
1059 -- navigation purposes. This is not done for the end label,
1060 -- where we want the actual position after the closing quote.
1065 elsif Nkind (N) = N_Defining_Operator_Symbol
1066 or else Nkind (Nod) = N_Operator_Symbol
1075 Eun => Get_Source_Unit (Def),
1076 Lun => Get_Source_Unit (Ref),
1078 Ent_Scope => Empty),
1079 Ent_Scope_File => No_Unit);
1081 -- Generate reference to the first private entity
1084 and then Comes_From_Source (E)
1085 and then Nkind (Ent) = N_Defining_Identifier
1086 and then (Is_Package_Or_Generic_Package (Ent)
1087 or else Is_Concurrent_Type (Ent))
1088 and then Present (First_Private_Entity (E))
1089 and then In_Extended_Main_Source_Unit (N)
1093 Loc => Sloc (First_Private_Entity (E)),
1095 Eun => Get_Source_Unit (Def),
1096 Lun => Get_Source_Unit (Ref),
1098 Ent_Scope => Empty),
1099 Ent_Scope_File => No_Unit);
1103 end Generate_Reference;
1105 -----------------------------------
1106 -- Generate_Reference_To_Formals --
1107 -----------------------------------
1109 procedure Generate_Reference_To_Formals (E : Entity_Id) is
1113 if Is_Generic_Subprogram (E) then
1114 Formal := First_Entity (E);
1116 while Present (Formal)
1117 and then not Is_Formal (Formal)
1119 Next_Entity (Formal);
1122 elsif Ekind (E) in Access_Subprogram_Kind then
1123 Formal := First_Formal (Designated_Type (E));
1126 Formal := First_Formal (E);
1129 while Present (Formal) loop
1130 if Ekind (Formal) = E_In_Parameter then
1132 if Nkind (Parameter_Type (Parent (Formal)))
1133 = N_Access_Definition
1135 Generate_Reference (E, Formal, '^', False);
1137 Generate_Reference (E, Formal, '>', False);
1140 elsif Ekind (Formal) = E_In_Out_Parameter then
1141 Generate_Reference (E, Formal, '=', False);
1144 Generate_Reference (E, Formal, '<', False);
1147 Next_Formal (Formal);
1149 end Generate_Reference_To_Formals;
1151 -------------------------------------------
1152 -- Generate_Reference_To_Generic_Formals --
1153 -------------------------------------------
1155 procedure Generate_Reference_To_Generic_Formals (E : Entity_Id) is
1159 Formal := First_Entity (E);
1160 while Present (Formal) loop
1161 if Comes_From_Source (Formal) then
1162 Generate_Reference (E, Formal, 'z', False);
1165 Next_Entity (Formal);
1167 end Generate_Reference_To_Generic_Formals;
1173 function Get_Key (E : Xref_Entry_Number) return Xref_Entry_Number is
1182 function Hash (F : Xref_Entry_Number) return Header_Num is
1183 -- It is unlikely to have two references to the same entity at the same
1184 -- source location, so the hash function depends only on the Ent and Loc
1187 XE : Xref_Entry renames Xrefs.Table (F);
1188 type M is mod 2**32;
1190 H : constant M := M (XE.Key.Ent) + 2 ** 7 * M (abs XE.Key.Loc);
1191 -- It would be more natural to write:
1193 -- H : constant M := M'Mod (XE.Key.Ent) + 2**7 * M'Mod (XE.Key.Loc);
1195 -- But we can't use M'Mod, because it prevents bootstrapping with older
1196 -- compilers. Loc can be negative, so we do "abs" before converting.
1197 -- One day this can be cleaned up ???
1200 return Header_Num (H mod Num_Buckets);
1207 procedure HT_Set_Next (E : Xref_Entry_Number; Next : Xref_Entry_Number) is
1209 Xrefs.Table (E).HTable_Next := Next;
1216 function HT_Next (E : Xref_Entry_Number) return Xref_Entry_Number is
1218 return Xrefs.Table (E).HTable_Next;
1225 procedure Initialize is
1234 function Lt (T1, T2 : Xref_Entry) return Boolean is
1236 -- First test: if entity is in different unit, sort by unit
1238 if T1.Key.Eun /= T2.Key.Eun then
1239 return Dependency_Num (T1.Key.Eun) < Dependency_Num (T2.Key.Eun);
1241 -- Second test: within same unit, sort by entity Sloc
1243 elsif T1.Def /= T2.Def then
1244 return T1.Def < T2.Def;
1246 -- Third test: sort definitions ahead of references
1248 elsif T1.Key.Loc = No_Location then
1251 elsif T2.Key.Loc = No_Location then
1254 -- Fourth test: for same entity, sort by reference location unit
1256 elsif T1.Key.Lun /= T2.Key.Lun then
1257 return Dependency_Num (T1.Key.Lun) < Dependency_Num (T2.Key.Lun);
1259 -- Fifth test: order of location within referencing unit
1261 elsif T1.Key.Loc /= T2.Key.Loc then
1262 return T1.Key.Loc < T2.Key.Loc;
1264 -- Finally, for two locations at the same address, we prefer
1265 -- the one that does NOT have the type 'r' so that a modification
1266 -- or extension takes preference, when there are more than one
1267 -- reference at the same location. As a result, in the case of
1268 -- entities that are in-out actuals, the read reference follows
1269 -- the modify reference.
1272 return T2.Key.Typ = 'r';
1276 -----------------------
1277 -- Output_References --
1278 -----------------------
1280 procedure Output_References is
1282 procedure Get_Type_Reference
1284 Tref : out Entity_Id;
1285 Left : out Character;
1286 Right : out Character);
1287 -- Given an Entity_Id Ent, determines whether a type reference is
1288 -- required. If so, Tref is set to the entity for the type reference
1289 -- and Left and Right are set to the left/right brackets to be output
1290 -- for the reference. If no type reference is required, then Tref is
1291 -- set to Empty, and Left/Right are set to space.
1293 procedure Output_Import_Export_Info (Ent : Entity_Id);
1294 -- Output language and external name information for an interfaced
1295 -- entity, using the format <language, external_name>.
1297 ------------------------
1298 -- Get_Type_Reference --
1299 ------------------------
1301 procedure Get_Type_Reference
1303 Tref : out Entity_Id;
1304 Left : out Character;
1305 Right : out Character)
1310 -- See if we have a type reference
1319 -- Processing for types
1321 if Is_Type (Tref) then
1323 -- Case of base type
1325 if Base_Type (Tref) = Tref then
1327 -- If derived, then get first subtype
1329 if Tref /= Etype (Tref) then
1330 Tref := First_Subtype (Etype (Tref));
1332 -- Set brackets for derived type, but don't override
1333 -- pointer case since the fact that something is a
1334 -- pointer is more important.
1341 -- If the completion of a private type is itself a derived
1342 -- type, we need the parent of the full view.
1344 elsif Is_Private_Type (Tref)
1345 and then Present (Full_View (Tref))
1346 and then Etype (Full_View (Tref)) /= Full_View (Tref)
1348 Tref := Etype (Full_View (Tref));
1355 -- If non-derived pointer, get directly designated type.
1356 -- If the type has a full view, all references are on the
1357 -- partial view that is seen first.
1359 elsif Is_Access_Type (Tref) then
1360 Tref := Directly_Designated_Type (Tref);
1364 elsif Is_Private_Type (Tref)
1365 and then Present (Full_View (Tref))
1367 if Is_Access_Type (Full_View (Tref)) then
1368 Tref := Directly_Designated_Type (Full_View (Tref));
1372 -- If the full view is an array type, we also retrieve
1373 -- the corresponding component type, because the ali
1374 -- entry already indicates that this is an array.
1376 elsif Is_Array_Type (Full_View (Tref)) then
1377 Tref := Component_Type (Full_View (Tref));
1382 -- If non-derived array, get component type. Skip component
1383 -- type for case of String or Wide_String, saves worthwhile
1386 elsif Is_Array_Type (Tref)
1387 and then Tref /= Standard_String
1388 and then Tref /= Standard_Wide_String
1390 Tref := Component_Type (Tref);
1394 -- For other non-derived base types, nothing
1400 -- For a subtype, go to ancestor subtype
1403 Tref := Ancestor_Subtype (Tref);
1405 -- If no ancestor subtype, go to base type
1408 Tref := Base_Type (Sav);
1412 -- For objects, functions, enum literals, just get type from
1415 elsif Is_Object (Tref)
1416 or else Ekind (Tref) = E_Enumeration_Literal
1417 or else Ekind (Tref) = E_Function
1418 or else Ekind (Tref) = E_Operator
1420 Tref := Etype (Tref);
1422 -- Another special case: an object of a classwide type
1423 -- initialized with a tag-indeterminate call gets a subtype
1424 -- of the classwide type during expansion. See if the original
1425 -- type in the declaration is named, and return it instead
1426 -- of going to the root type.
1428 if Ekind (Tref) = E_Class_Wide_Subtype
1429 and then Nkind (Parent (Ent)) = N_Object_Declaration
1431 Nkind (Original_Node (Object_Definition (Parent (Ent))))
1436 (Original_Node ((Object_Definition (Parent (Ent)))));
1439 -- For anything else, exit
1445 -- Exit if no type reference, or we are stuck in some loop trying
1446 -- to find the type reference, or if the type is standard void
1447 -- type (the latter is an implementation artifact that should not
1448 -- show up in the generated cross-references).
1452 or else Tref = Standard_Void_Type;
1454 -- If we have a usable type reference, return, otherwise keep
1455 -- looking for something useful (we are looking for something
1456 -- that either comes from source or standard)
1458 if Sloc (Tref) = Standard_Location
1459 or else Comes_From_Source (Tref)
1461 -- If the reference is a subtype created for a generic actual,
1462 -- go actual directly, the inner subtype is not user visible.
1464 if Nkind (Parent (Tref)) = N_Subtype_Declaration
1465 and then not Comes_From_Source (Parent (Tref))
1467 (Is_Wrapper_Package (Scope (Tref))
1468 or else Is_Generic_Instance (Scope (Tref)))
1470 Tref := First_Subtype (Base_Type (Tref));
1477 -- If we fall through the loop, no type reference
1482 end Get_Type_Reference;
1484 -------------------------------
1485 -- Output_Import_Export_Info --
1486 -------------------------------
1488 procedure Output_Import_Export_Info (Ent : Entity_Id) is
1489 Language_Name : Name_Id;
1490 Conv : constant Convention_Id := Convention (Ent);
1493 -- Generate language name from convention
1495 if Conv = Convention_C then
1496 Language_Name := Name_C;
1498 elsif Conv = Convention_CPP then
1499 Language_Name := Name_CPP;
1501 elsif Conv = Convention_Ada then
1502 Language_Name := Name_Ada;
1505 -- For the moment we ignore all other cases ???
1510 Write_Info_Char ('<');
1511 Get_Unqualified_Name_String (Language_Name);
1513 for J in 1 .. Name_Len loop
1514 Write_Info_Char (Name_Buffer (J));
1517 if Present (Interface_Name (Ent)) then
1518 Write_Info_Char (',');
1519 String_To_Name_Buffer (Strval (Interface_Name (Ent)));
1521 for J in 1 .. Name_Len loop
1522 Write_Info_Char (Name_Buffer (J));
1526 Write_Info_Char ('>');
1527 end Output_Import_Export_Info;
1529 -- Start of processing for Output_References
1532 -- First we add references to the primitive operations of tagged types
1533 -- declared in the main unit.
1535 Handle_Prim_Ops : declare
1539 for J in 1 .. Xrefs.Last loop
1540 Ent := Xrefs.Table (J).Key.Ent;
1543 and then Is_Tagged_Type (Ent)
1544 and then Is_Base_Type (Ent)
1545 and then In_Extended_Main_Source_Unit (Ent)
1547 Generate_Prim_Op_References (Ent);
1550 end Handle_Prim_Ops;
1552 -- Before we go ahead and output the references we have a problem
1553 -- that needs dealing with. So far we have captured things that are
1554 -- definitely referenced by the main unit, or defined in the main
1555 -- unit. That's because we don't want to clutter up the ali file
1556 -- for this unit with definition lines for entities in other units
1557 -- that are not referenced.
1559 -- But there is a glitch. We may reference an entity in another unit,
1560 -- and it may have a type reference to an entity that is not directly
1561 -- referenced in the main unit, which may mean that there is no xref
1562 -- entry for this entity yet in the list of references.
1564 -- If we don't do something about this, we will end with an orphan type
1565 -- reference, i.e. it will point to an entity that does not appear
1566 -- within the generated references in the ali file. That is not good for
1567 -- tools using the xref information.
1569 -- To fix this, we go through the references adding definition entries
1570 -- for any unreferenced entities that can be referenced in a type
1571 -- reference. There is a recursion problem here, and that is dealt with
1572 -- by making sure that this traversal also traverses any entries that
1573 -- get added by the traversal.
1575 Handle_Orphan_Type_References : declare
1581 pragma Warnings (Off, L);
1582 pragma Warnings (Off, R);
1584 procedure New_Entry (E : Entity_Id);
1585 -- Make an additional entry into the Xref table for a type entity
1586 -- that is related to the current entity (parent, type ancestor,
1587 -- progenitor, etc.).
1593 procedure New_Entry (E : Entity_Id) is
1595 pragma Assert (Present (E));
1597 if not Has_Xref_Entry (Implementation_Base_Type (E))
1598 and then Sloc (E) > No_Location
1603 Typ => Character'First,
1604 Eun => Get_Source_Unit (Original_Location (Sloc (E))),
1607 Ent_Scope => Empty),
1608 Ent_Scope_File => No_Unit);
1612 -- Start of processing for Handle_Orphan_Type_References
1615 -- Note that this is not a for loop for a very good reason. The
1616 -- processing of items in the table can add new items to the table,
1617 -- and they must be processed as well.
1620 while J <= Xrefs.Last loop
1621 Ent := Xrefs.Table (J).Key.Ent;
1622 Get_Type_Reference (Ent, Tref, L, R);
1625 and then not Has_Xref_Entry (Tref)
1626 and then Sloc (Tref) > No_Location
1630 if Is_Record_Type (Ent)
1631 and then Present (Interfaces (Ent))
1633 -- Add an entry for each one of the given interfaces
1634 -- implemented by type Ent.
1637 Elmt : Elmt_Id := First_Elmt (Interfaces (Ent));
1639 while Present (Elmt) loop
1640 New_Entry (Node (Elmt));
1647 -- Collect inherited primitive operations that may be declared in
1648 -- another unit and have no visible reference in the current one.
1651 and then Is_Tagged_Type (Ent)
1652 and then Is_Derived_Type (Ent)
1653 and then Is_Base_Type (Ent)
1654 and then In_Extended_Main_Source_Unit (Ent)
1657 Op_List : constant Elist_Id := Primitive_Operations (Ent);
1661 function Parent_Op (E : Entity_Id) return Entity_Id;
1662 -- Find original operation, which may be inherited through
1663 -- several derivations.
1665 function Parent_Op (E : Entity_Id) return Entity_Id is
1666 Orig_Op : constant Entity_Id := Alias (E);
1669 if No (Orig_Op) then
1672 elsif not Comes_From_Source (E)
1673 and then not Has_Xref_Entry (Orig_Op)
1674 and then Comes_From_Source (Orig_Op)
1678 return Parent_Op (Orig_Op);
1683 Op := First_Elmt (Op_List);
1684 while Present (Op) loop
1685 Prim := Parent_Op (Node (Op));
1687 if Present (Prim) then
1691 Typ => Character'First,
1692 Eun => Get_Source_Unit (Sloc (Prim)),
1695 Ent_Scope => Empty),
1696 Ent_Scope_File => No_Unit);
1706 end Handle_Orphan_Type_References;
1708 -- Now we have all the references, including those for any embedded
1709 -- type references, so we can sort them, and output them.
1711 Output_Refs : declare
1713 Nrefs : constant Nat := Xrefs.Last;
1714 -- Number of references in table
1716 Rnums : array (0 .. Nrefs) of Nat;
1717 -- This array contains numbers of references in the Xrefs table.
1718 -- This list is sorted in output order. The extra 0'th entry is
1719 -- convenient for the call to sort. When we sort the table, we
1720 -- move the entries in Rnums around, but we do not move the
1721 -- original table entries.
1723 Curxu : Unit_Number_Type;
1724 -- Current xref unit
1726 Curru : Unit_Number_Type;
1727 -- Current reference unit for one entity
1732 Curnam : String (1 .. Name_Buffer'Length);
1734 -- Simple name and length of current entity
1736 Curdef : Source_Ptr;
1737 -- Original source location for current entity
1740 -- Current reference location
1743 -- Entity type character
1746 -- reference kind of previous reference
1752 -- Renaming reference
1754 Trunit : Unit_Number_Type;
1755 -- Unit number for type reference
1757 function Lt (Op1, Op2 : Natural) return Boolean;
1758 -- Comparison function for Sort call
1760 function Name_Change (X : Entity_Id) return Boolean;
1761 -- Determines if entity X has a different simple name from Curent
1763 procedure Move (From : Natural; To : Natural);
1764 -- Move procedure for Sort call
1766 package Sorting is new GNAT.Heap_Sort_G (Move, Lt);
1772 function Lt (Op1, Op2 : Natural) return Boolean is
1773 T1 : Xref_Entry renames Xrefs.Table (Rnums (Nat (Op1)));
1774 T2 : Xref_Entry renames Xrefs.Table (Rnums (Nat (Op2)));
1784 procedure Move (From : Natural; To : Natural) is
1786 Rnums (Nat (To)) := Rnums (Nat (From));
1793 -- Why a string comparison here??? Why not compare Name_Id values???
1795 function Name_Change (X : Entity_Id) return Boolean is
1797 Get_Unqualified_Name_String (Chars (X));
1799 if Name_Len /= Curlen then
1802 return Name_Buffer (1 .. Curlen) /= Curnam (1 .. Curlen);
1806 -- Start of processing for Output_Refs
1809 -- Capture the definition Sloc values. We delay doing this till now,
1810 -- since at the time the reference or definition is made, private
1811 -- types may be swapped, and the Sloc value may be incorrect. We
1812 -- also set up the pointer vector for the sort.
1814 -- For user-defined operators we need to skip the initial quote and
1815 -- point to the first character of the name, for navigation purposes.
1817 for J in 1 .. Nrefs loop
1819 E : constant Entity_Id := Xrefs.Table (J).Key.Ent;
1820 Loc : constant Source_Ptr := Original_Location (Sloc (E));
1825 if Nkind (E) = N_Defining_Operator_Symbol then
1826 Xrefs.Table (J).Def := Loc + 1;
1828 Xrefs.Table (J).Def := Loc;
1833 -- Sort the references
1835 Sorting.Sort (Integer (Nrefs));
1837 -- Initialize loop through references
1841 Curdef := No_Location;
1843 Crloc := No_Location;
1846 -- Loop to output references
1848 for Refno in 1 .. Nrefs loop
1849 Output_One_Ref : declare
1852 XE : Xref_Entry renames Xrefs.Table (Rnums (Refno));
1853 -- The current entry to be accessed
1857 -- Used for {} or <> or () for type reference
1859 procedure Check_Type_Reference
1861 List_Interface : Boolean);
1862 -- Find whether there is a meaningful type reference for
1863 -- Ent, and display it accordingly. If List_Interface is
1864 -- true, then Ent is a progenitor interface of the current
1865 -- type entity being listed. In that case list it as is,
1866 -- without looking for a type reference for it.
1868 procedure Output_Instantiation_Refs (Loc : Source_Ptr);
1869 -- Recursive procedure to output instantiation references for
1870 -- the given source ptr in [file|line[...]] form. No output
1871 -- if the given location is not a generic template reference.
1873 procedure Output_Overridden_Op (Old_E : Entity_Id);
1874 -- For a subprogram that is overriding, display information
1875 -- about the inherited operation that it overrides.
1877 --------------------------
1878 -- Check_Type_Reference --
1879 --------------------------
1881 procedure Check_Type_Reference
1883 List_Interface : Boolean)
1886 if List_Interface then
1888 -- This is a progenitor interface of the type for which
1889 -- xref information is being generated.
1896 Get_Type_Reference (Ent, Tref, Left, Right);
1899 if Present (Tref) then
1901 -- Case of standard entity, output name
1903 if Sloc (Tref) = Standard_Location then
1904 Write_Info_Char (Left);
1905 Write_Info_Name (Chars (Tref));
1906 Write_Info_Char (Right);
1908 -- Case of source entity, output location
1911 Write_Info_Char (Left);
1912 Trunit := Get_Source_Unit (Sloc (Tref));
1914 if Trunit /= Curxu then
1915 Write_Info_Nat (Dependency_Num (Trunit));
1916 Write_Info_Char ('|');
1920 (Int (Get_Logical_Line_Number (Sloc (Tref))));
1928 Ctyp := Xref_Entity_Letters (Ekind (Ent));
1931 and then Present (Full_View (Ent))
1933 Ent := Underlying_Type (Ent);
1935 if Present (Ent) then
1936 Ctyp := Xref_Entity_Letters (Ekind (Ent));
1940 Write_Info_Char (Ctyp);
1944 (Int (Get_Column_Number (Sloc (Tref))));
1946 -- If the type comes from an instantiation, add the
1947 -- corresponding info.
1949 Output_Instantiation_Refs (Sloc (Tref));
1950 Write_Info_Char (Right);
1953 end Check_Type_Reference;
1955 -------------------------------
1956 -- Output_Instantiation_Refs --
1957 -------------------------------
1959 procedure Output_Instantiation_Refs (Loc : Source_Ptr) is
1960 Iloc : constant Source_Ptr := Instantiation_Location (Loc);
1961 Lun : Unit_Number_Type;
1962 Cu : constant Unit_Number_Type := Curru;
1965 -- Nothing to do if this is not an instantiation
1967 if Iloc = No_Location then
1971 -- Output instantiation reference
1973 Write_Info_Char ('[');
1974 Lun := Get_Source_Unit (Iloc);
1976 if Lun /= Curru then
1978 Write_Info_Nat (Dependency_Num (Curru));
1979 Write_Info_Char ('|');
1982 Write_Info_Nat (Int (Get_Logical_Line_Number (Iloc)));
1984 -- Recursive call to get nested instantiations
1986 Output_Instantiation_Refs (Iloc);
1988 -- Output final ] after call to get proper nesting
1990 Write_Info_Char (']');
1993 end Output_Instantiation_Refs;
1995 --------------------------
1996 -- Output_Overridden_Op --
1997 --------------------------
1999 procedure Output_Overridden_Op (Old_E : Entity_Id) is
2003 -- The overridden operation has an implicit declaration
2004 -- at the point of derivation. What we want to display
2005 -- is the original operation, which has the actual body
2006 -- (or abstract declaration) that is being overridden.
2007 -- The overridden operation is not always set, e.g. when
2008 -- it is a predefined operator.
2013 -- Follow alias chain if one is present
2015 elsif Present (Alias (Old_E)) then
2017 -- The subprogram may have been implicitly inherited
2018 -- through several levels of derivation, so find the
2019 -- ultimate (source) ancestor.
2021 Op := Ultimate_Alias (Old_E);
2023 -- Normal case of no alias present. We omit generated
2024 -- primitives like tagged equality, that have no source
2032 and then Sloc (Op) /= Standard_Location
2033 and then Comes_From_Source (Op)
2036 Loc : constant Source_Ptr := Sloc (Op);
2037 Par_Unit : constant Unit_Number_Type :=
2038 Get_Source_Unit (Loc);
2041 Write_Info_Char ('<');
2043 if Par_Unit /= Curxu then
2044 Write_Info_Nat (Dependency_Num (Par_Unit));
2045 Write_Info_Char ('|');
2048 Write_Info_Nat (Int (Get_Logical_Line_Number (Loc)));
2049 Write_Info_Char ('p');
2050 Write_Info_Nat (Int (Get_Column_Number (Loc)));
2051 Write_Info_Char ('>');
2054 end Output_Overridden_Op;
2056 -- Start of processing for Output_One_Ref
2060 Ctyp := Xref_Entity_Letters (Ekind (Ent));
2062 -- Skip reference if it is the only reference to an entity,
2063 -- and it is an END line reference, and the entity is not in
2064 -- the current extended source. This prevents junk entries
2065 -- consisting only of packages with END lines, where no
2066 -- entity from the package is actually referenced.
2069 and then Ent /= Curent
2070 and then (Refno = Nrefs
2072 Ent /= Xrefs.Table (Rnums (Refno + 1)).Key.Ent)
2073 and then not In_Extended_Main_Source_Unit (Ent)
2078 -- For private type, get full view type
2081 and then Present (Full_View (XE.Key.Ent))
2083 Ent := Underlying_Type (Ent);
2085 if Present (Ent) then
2086 Ctyp := Xref_Entity_Letters (Ekind (Ent));
2090 -- Special exception for Boolean
2092 if Ctyp = 'E' and then Is_Boolean_Type (Ent) then
2096 -- For variable reference, get corresponding type
2099 Ent := Etype (XE.Key.Ent);
2100 Ctyp := Fold_Lower (Xref_Entity_Letters (Ekind (Ent)));
2102 -- If variable is private type, get full view type
2105 and then Present (Full_View (Etype (XE.Key.Ent)))
2107 Ent := Underlying_Type (Etype (XE.Key.Ent));
2109 if Present (Ent) then
2110 Ctyp := Fold_Lower (Xref_Entity_Letters (Ekind (Ent)));
2113 elsif Is_Generic_Type (Ent) then
2115 -- If the type of the entity is a generic private type,
2116 -- there is no usable full view, so retain the indication
2117 -- that this is an object.
2122 -- Special handling for access parameters and objects and
2123 -- components of an anonymous access type.
2125 if Ekind_In (Etype (XE.Key.Ent),
2126 E_Anonymous_Access_Type,
2127 E_Anonymous_Access_Subprogram_Type,
2128 E_Anonymous_Access_Protected_Subprogram_Type)
2130 if Is_Formal (XE.Key.Ent)
2133 (XE.Key.Ent, E_Variable, E_Constant, E_Component)
2138 -- Special handling for Boolean
2140 elsif Ctyp = 'e' and then Is_Boolean_Type (Ent) then
2145 -- Special handling for abstract types and operations
2147 if Is_Overloadable (XE.Key.Ent)
2148 and then Is_Abstract_Subprogram (XE.Key.Ent)
2151 Ctyp := 'x'; -- Abstract procedure
2153 elsif Ctyp = 'V' then
2154 Ctyp := 'y'; -- Abstract function
2157 elsif Is_Type (XE.Key.Ent)
2158 and then Is_Abstract_Type (XE.Key.Ent)
2160 if Is_Interface (XE.Key.Ent) then
2163 elsif Ctyp = 'R' then
2164 Ctyp := 'H'; -- Abstract type
2168 -- Only output reference if interesting type of entity
2172 -- Suppress references to object definitions, used for local
2175 or else XE.Key.Typ = 'D'
2176 or else XE.Key.Typ = 'I'
2178 -- Suppress self references, except for bodies that act as
2181 or else (XE.Key.Loc = XE.Def
2184 or else not Is_Subprogram (XE.Key.Ent)))
2186 -- Also suppress definitions of body formals (we only
2187 -- treat these as references, and the references were
2188 -- separately recorded).
2190 or else (Is_Formal (XE.Key.Ent)
2191 and then Present (Spec_Entity (XE.Key.Ent)))
2196 -- Start new Xref section if new xref unit
2198 if XE.Key.Eun /= Curxu then
2199 if Write_Info_Col > 1 then
2203 Curxu := XE.Key.Eun;
2205 Write_Info_Initiate ('X');
2206 Write_Info_Char (' ');
2207 Write_Info_Nat (Dependency_Num (XE.Key.Eun));
2208 Write_Info_Char (' ');
2210 (Reference_Name (Source_Index (XE.Key.Eun)));
2213 -- Start new Entity line if new entity. Note that we
2214 -- consider two entities the same if they have the same
2215 -- name and source location. This causes entities in
2216 -- instantiations to be treated as though they referred
2221 (XE.Key.Ent /= Curent
2223 (Name_Change (XE.Key.Ent) or else XE.Def /= Curdef))
2225 Curent := XE.Key.Ent;
2228 Get_Unqualified_Name_String (Chars (XE.Key.Ent));
2230 Curnam (1 .. Curlen) := Name_Buffer (1 .. Curlen);
2232 if Write_Info_Col > 1 then
2236 -- Write column number information
2238 Write_Info_Nat (Int (Get_Logical_Line_Number (XE.Def)));
2239 Write_Info_Char (Ctyp);
2240 Write_Info_Nat (Int (Get_Column_Number (XE.Def)));
2242 -- Write level information
2244 Write_Level_Info : declare
2245 function Is_Visible_Generic_Entity
2246 (E : Entity_Id) return Boolean;
2247 -- Check whether E is declared in the visible part
2248 -- of a generic package. For source navigation
2249 -- purposes, treat this as a visible entity.
2251 function Is_Private_Record_Component
2252 (E : Entity_Id) return Boolean;
2253 -- Check whether E is a non-inherited component of a
2254 -- private extension. Even if the enclosing record is
2255 -- public, we want to treat the component as private
2256 -- for navigation purposes.
2258 ---------------------------------
2259 -- Is_Private_Record_Component --
2260 ---------------------------------
2262 function Is_Private_Record_Component
2263 (E : Entity_Id) return Boolean
2265 S : constant Entity_Id := Scope (E);
2268 Ekind (E) = E_Component
2269 and then Nkind (Declaration_Node (S)) =
2270 N_Private_Extension_Declaration
2271 and then Original_Record_Component (E) = E;
2272 end Is_Private_Record_Component;
2274 -------------------------------
2275 -- Is_Visible_Generic_Entity --
2276 -------------------------------
2278 function Is_Visible_Generic_Entity
2279 (E : Entity_Id) return Boolean
2284 -- The Present check here is an error defense
2286 if Present (Scope (E))
2287 and then Ekind (Scope (E)) /= E_Generic_Package
2293 while Present (Par) loop
2295 Nkind (Par) = N_Generic_Package_Declaration
2297 -- Entity is a generic formal
2302 Nkind (Parent (Par)) = N_Package_Specification
2305 Is_List_Member (Par)
2306 and then List_Containing (Par) =
2307 Visible_Declarations (Parent (Par));
2309 Par := Parent (Par);
2314 end Is_Visible_Generic_Entity;
2316 -- Start of processing for Write_Level_Info
2319 if Is_Hidden (Curent)
2320 or else Is_Private_Record_Component (Curent)
2322 Write_Info_Char (' ');
2326 or else Is_Visible_Generic_Entity (Curent)
2328 Write_Info_Char ('*');
2331 Write_Info_Char (' ');
2333 end Write_Level_Info;
2335 -- Output entity name. We use the occurrence from the
2336 -- actual source program at the definition point.
2339 Ent_Name : constant String :=
2340 Exact_Source_Name (Sloc (XE.Key.Ent));
2342 for C in Ent_Name'Range loop
2343 Write_Info_Char (Ent_Name (C));
2347 -- See if we have a renaming reference
2349 if Is_Object (XE.Key.Ent)
2350 and then Present (Renamed_Object (XE.Key.Ent))
2352 Rref := Renamed_Object (XE.Key.Ent);
2354 elsif Is_Overloadable (XE.Key.Ent)
2355 and then Nkind (Parent (Declaration_Node (XE.Key.Ent)))
2356 = N_Subprogram_Renaming_Declaration
2358 Rref := Name (Parent (Declaration_Node (XE.Key.Ent)));
2360 elsif Ekind (XE.Key.Ent) = E_Package
2361 and then Nkind (Declaration_Node (XE.Key.Ent)) =
2362 N_Package_Renaming_Declaration
2364 Rref := Name (Declaration_Node (XE.Key.Ent));
2370 if Present (Rref) then
2371 if Nkind (Rref) = N_Expanded_Name then
2372 Rref := Selector_Name (Rref);
2375 if Nkind (Rref) = N_Identifier
2376 or else Nkind (Rref) = N_Operator_Symbol
2380 -- For renamed array components, use the array name
2381 -- for the renamed entity, which reflect the fact that
2382 -- in general the whole array is aliased.
2384 elsif Nkind (Rref) = N_Indexed_Component then
2385 if Nkind (Prefix (Rref)) = N_Identifier then
2386 Rref := Prefix (Rref);
2387 elsif Nkind (Prefix (Rref)) = N_Expanded_Name then
2388 Rref := Selector_Name (Prefix (Rref));
2398 -- Write out renaming reference if we have one
2400 if Present (Rref) then
2401 Write_Info_Char ('=');
2403 (Int (Get_Logical_Line_Number (Sloc (Rref))));
2404 Write_Info_Char (':');
2406 (Int (Get_Column_Number (Sloc (Rref))));
2409 -- Indicate that the entity is in the unit of the current
2414 -- Write out information about generic parent, if entity
2417 if Is_Generic_Instance (XE.Key.Ent) then
2419 Gen_Par : constant Entity_Id :=
2422 (Unit_Declaration_Node
2424 Loc : constant Source_Ptr := Sloc (Gen_Par);
2425 Gen_U : constant Unit_Number_Type :=
2426 Get_Source_Unit (Loc);
2429 Write_Info_Char ('[');
2431 if Curru /= Gen_U then
2432 Write_Info_Nat (Dependency_Num (Gen_U));
2433 Write_Info_Char ('|');
2437 (Int (Get_Logical_Line_Number (Loc)));
2438 Write_Info_Char (']');
2442 -- See if we have a type reference and if so output
2444 Check_Type_Reference (XE.Key.Ent, False);
2446 -- Additional information for types with progenitors,
2447 -- including synchronized tagged types.
2450 Typ : constant Entity_Id := XE.Key.Ent;
2454 if Is_Record_Type (Typ)
2455 and then Present (Interfaces (Typ))
2457 Elmt := First_Elmt (Interfaces (Typ));
2459 elsif Is_Concurrent_Type (Typ)
2460 and then Present (Corresponding_Record_Type (Typ))
2462 Interfaces (Corresponding_Record_Type (Typ)))
2466 Interfaces (Corresponding_Record_Type (Typ)));
2472 while Present (Elmt) loop
2473 Check_Type_Reference (Node (Elmt), True);
2478 -- For array types, list index types as well. (This is
2479 -- not C, indexes have distinct types).
2481 if Is_Array_Type (XE.Key.Ent) then
2485 Indx := First_Index (XE.Key.Ent);
2486 while Present (Indx) loop
2487 Check_Type_Reference
2488 (First_Subtype (Etype (Indx)), True);
2494 -- If the entity is an overriding operation, write info
2495 -- on operation that was overridden.
2497 if Is_Subprogram (XE.Key.Ent)
2498 and then Present (Overridden_Operation (XE.Key.Ent))
2500 Output_Overridden_Op
2501 (Overridden_Operation (XE.Key.Ent));
2504 -- End of processing for entity output
2506 Crloc := No_Location;
2509 -- Output the reference if it is not as the same location
2510 -- as the previous one, or it is a read-reference that
2511 -- indicates that the entity is an in-out actual in a call.
2513 if XE.Key.Loc /= No_Location
2515 (XE.Key.Loc /= Crloc
2516 or else (Prevt = 'm' and then XE.Key.Typ = 'r'))
2518 Crloc := XE.Key.Loc;
2519 Prevt := XE.Key.Typ;
2521 -- Start continuation if line full, else blank
2523 if Write_Info_Col > 72 then
2525 Write_Info_Initiate ('.');
2528 Write_Info_Char (' ');
2530 -- Output file number if changed
2532 if XE.Key.Lun /= Curru then
2533 Curru := XE.Key.Lun;
2534 Write_Info_Nat (Dependency_Num (Curru));
2535 Write_Info_Char ('|');
2539 (Int (Get_Logical_Line_Number (XE.Key.Loc)));
2540 Write_Info_Char (XE.Key.Typ);
2542 if Is_Overloadable (XE.Key.Ent) then
2543 if (Is_Imported (XE.Key.Ent) and then XE.Key.Typ = 'b')
2545 (Is_Exported (XE.Key.Ent) and then XE.Key.Typ = 'i')
2547 Output_Import_Export_Info (XE.Key.Ent);
2551 Write_Info_Nat (Int (Get_Column_Number (XE.Key.Loc)));
2553 Output_Instantiation_Refs (Sloc (XE.Key.Ent));
2564 end Output_References;
2566 -- Start of elaboration for Lib.Xref
2569 -- Reset is necessary because Elmt_Ptr does not default to Null_Ptr,
2570 -- because it's not an access type.