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:
435 -- Sem_Util.May_Be_Lvalue
436 -- Sem_Util.Known_To_Be_Assigned
437 -- Exp_Ch2.Expand_Entry_Parameter.In_Assignment_Context
438 -- Exp_Smem.Is_Out_Actual
440 function Is_On_LHS (Node : Node_Id) return Boolean is
446 -- Only identifiers are considered, is this necessary???
448 if Nkind (Node) /= N_Identifier then
452 -- Immediate return if appeared as OUT parameter
454 if Kind = E_Out_Parameter then
458 -- Search for assignment statement subtree root
465 if K = N_Assignment_Statement then
468 -- Check whether the parent is a component and the current node is
469 -- its prefix, but return False if the current node has an access
470 -- type, as in that case the selected or indexed component is an
471 -- implicit dereference, and the LHS is the designated object, not
472 -- the access object.
474 -- ??? case of a slice assignment?
476 -- ??? Note that in some cases this is called too early
477 -- (see comments in Sem_Ch8.Find_Direct_Name), at a point where
478 -- the tree is not fully typed yet. In that case we may lack
479 -- an Etype for N, and we must disable the check for an implicit
480 -- dereference. If the dereference is on an LHS, this causes a
483 elsif (K = N_Selected_Component or else K = N_Indexed_Component)
484 and then Prefix (P) = N
485 and then not (Present (Etype (N))
487 Is_Access_Type (Etype (N)))
491 -- All other cases, definitely not on left side
499 ---------------------------
500 -- OK_To_Set_Referenced --
501 ---------------------------
503 function OK_To_Set_Referenced return Boolean is
507 -- A reference from a pragma Unreferenced or pragma Unmodified or
508 -- pragma Warnings does not cause the Referenced flag to be set.
509 -- This avoids silly warnings about things being referenced and
510 -- not assigned when the only reference is from the pragma.
512 if Nkind (N) = N_Identifier then
515 if Nkind (P) = N_Pragma_Argument_Association then
518 if Nkind (P) = N_Pragma then
519 if Nam_In (Pragma_Name (P), Name_Warnings,
527 -- A reference to a formal in a named parameter association does
528 -- not make the formal referenced. Formals that are unused in the
529 -- subprogram body are properly flagged as such, even if calls
530 -- elsewhere use named notation.
532 elsif Nkind (P) = N_Parameter_Association
533 and then N = Selector_Name (P)
540 end OK_To_Set_Referenced;
542 -- Start of processing for Generate_Reference
545 pragma Assert (Nkind (E) in N_Entity);
546 Find_Actual (N, Formal, Call);
548 if Present (Formal) then
549 Kind := Ekind (Formal);
554 -- Check for obsolescent reference to package ASCII. GNAT treats this
555 -- element of annex J specially since in practice, programs make a lot
556 -- of use of this feature, so we don't include it in the set of features
557 -- diagnosed when Warn_On_Obsolescent_Features mode is set. However we
558 -- are required to note it as a violation of the RM defined restriction.
560 if E = Standard_ASCII then
561 Check_Restriction (No_Obsolescent_Features, N);
564 -- Check for reference to entity marked with Is_Obsolescent
566 -- Note that we always allow obsolescent references in the compiler
567 -- itself and the run time, since we assume that we know what we are
568 -- doing in such cases. For example the calls in Ada.Characters.Handling
569 -- to its own obsolescent subprograms are just fine.
571 -- In any case we only generate warnings if we are in the extended main
572 -- source unit, and the entity itself is not in the extended main source
573 -- unit, since we assume the source unit itself knows what is going on
574 -- (and for sure we do not want silly warnings, e.g. on the end line of
575 -- an obsolescent procedure body).
577 if Is_Obsolescent (E)
578 and then not GNAT_Mode
579 and then not In_Extended_Main_Source_Unit (E)
580 and then In_Extended_Main_Source_Unit (N)
582 Check_Restriction (No_Obsolescent_Features, N);
584 if Warn_On_Obsolescent_Feature then
585 Output_Obsolescent_Entity_Warnings (N, E);
589 -- Warn if reference to Ada 2005 entity not in Ada 2005 mode. We only
590 -- detect real explicit references (modifications and references).
592 if Comes_From_Source (N)
593 and then Is_Ada_2005_Only (E)
594 and then Ada_Version < Ada_2005
595 and then Warn_On_Ada_2005_Compatibility
596 and then (Typ = 'm' or else Typ = 'r' or else Typ = 's')
598 Error_Msg_NE ("& is only defined in Ada 2005?y?", N, E);
601 -- Warn if reference to Ada 2012 entity not in Ada 2012 mode. We only
602 -- detect real explicit references (modifications and references).
604 if Comes_From_Source (N)
605 and then Is_Ada_2012_Only (E)
606 and then Ada_Version < Ada_2012
607 and then Warn_On_Ada_2012_Compatibility
608 and then (Typ = 'm' or else Typ = 'r')
610 Error_Msg_NE ("& is only defined in Ada 2012?y?", N, E);
613 -- Do not generate references if we are within a postcondition sub-
614 -- program, because the reference does not comes from source, and the
615 -- pre-analysis of the aspect has already created an entry for the ali
616 -- file at the proper source location.
618 if Chars (Current_Scope) = Name_uPostconditions then
622 -- Never collect references if not in main source unit. However, we omit
623 -- this test if Typ is 'e' or 'k', since these entries are structural,
624 -- and it is useful to have them in units that reference packages as
625 -- well as units that define packages. We also omit the test for the
626 -- case of 'p' since we want to include inherited primitive operations
627 -- from other packages.
629 -- We also omit this test is this is a body reference for a subprogram
630 -- instantiation. In this case the reference is to the generic body,
631 -- which clearly need not be in the main unit containing the instance.
632 -- For the same reason we accept an implicit reference generated for
633 -- a default in an instance.
635 if not In_Extended_Main_Source_Unit (N) then
641 or else (Typ = 'b' and then Is_Generic_Instance (E))
643 -- Allow the generation of references to reads, writes and calls
644 -- in SPARK mode when the related context comes from an instance.
648 and then In_Extended_Main_Code_Unit (N)
649 and then (Typ = 'm' or else Typ = 'r' or else Typ = 's'))
657 -- For reference type p, the entity must be in main source unit
659 if Typ = 'p' and then not In_Extended_Main_Source_Unit (E) then
663 -- Unless the reference is forced, we ignore references where the
664 -- reference itself does not come from source.
666 if not Force and then not Comes_From_Source (N) then
670 -- Deal with setting entity as referenced, unless suppressed. Note that
671 -- we still do Set_Referenced on entities that do not come from source.
672 -- This situation arises when we have a source reference to a derived
673 -- operation, where the derived operation itself does not come from
674 -- source, but we still want to mark it as referenced, since we really
675 -- are referencing an entity in the corresponding package (this avoids
676 -- wrong complaints that the package contains no referenced entities).
680 -- Assignable object appearing on left side of assignment or as
684 and then Is_On_LHS (N)
685 and then Ekind (E) /= E_In_Out_Parameter
687 -- For objects that are renamings, just set as simply referenced
688 -- we do not try to do assignment type tracking in this case.
690 if Present (Renamed_Object (E)) then
693 -- Out parameter case
695 elsif Kind = E_Out_Parameter then
697 -- If warning mode for all out parameters is set, or this is
698 -- the only warning parameter, then we want to mark this for
699 -- later warning logic by setting Referenced_As_Out_Parameter
701 if Warn_On_Modified_As_Out_Parameter (Formal) then
702 Set_Referenced_As_Out_Parameter (E, True);
703 Set_Referenced_As_LHS (E, False);
705 -- For OUT parameter not covered by the above cases, we simply
706 -- regard it as a normal reference (in this case we do not
707 -- want any of the warning machinery for out parameters).
713 -- For the left hand of an assignment case, we do nothing here.
714 -- The processing for Analyze_Assignment_Statement will set the
715 -- Referenced_As_LHS flag.
721 -- Check for a reference in a pragma that should not count as a
722 -- making the variable referenced for warning purposes.
724 elsif Is_Non_Significant_Pragma_Reference (N) then
727 -- A reference in an attribute definition clause does not count as a
728 -- reference except for the case of Address. The reason that 'Address
729 -- is an exception is that it creates an alias through which the
730 -- variable may be referenced.
732 elsif Nkind (Parent (N)) = N_Attribute_Definition_Clause
733 and then Chars (Parent (N)) /= Name_Address
734 and then N = Name (Parent (N))
738 -- Constant completion does not count as a reference
741 and then Ekind (E) = E_Constant
745 -- Record representation clause does not count as a reference
747 elsif Nkind (N) = N_Identifier
748 and then Nkind (Parent (N)) = N_Record_Representation_Clause
752 -- Discriminants do not need to produce a reference to record type
755 and then Nkind (Parent (N)) = N_Discriminant_Specification
762 -- Special processing for IN OUT parameters, where we have an
763 -- implicit assignment to a simple variable.
765 if Kind = E_In_Out_Parameter
766 and then Is_Assignable (E)
768 -- For sure this counts as a normal read reference
771 Set_Last_Assignment (E, Empty);
773 -- We count it as being referenced as an out parameter if the
774 -- option is set to warn on all out parameters, except that we
775 -- have a special exclusion for an intrinsic subprogram, which
776 -- is most likely an instantiation of Unchecked_Deallocation
777 -- which we do not want to consider as an assignment since it
778 -- generates false positives. We also exclude the case of an
779 -- IN OUT parameter if the name of the procedure is Free,
780 -- since we suspect similar semantics.
782 if Warn_On_All_Unread_Out_Parameters
783 and then Is_Entity_Name (Name (Call))
784 and then not Is_Intrinsic_Subprogram (Entity (Name (Call)))
785 and then Chars (Name (Call)) /= Name_Free
787 Set_Referenced_As_Out_Parameter (E, True);
788 Set_Referenced_As_LHS (E, False);
791 -- Don't count a recursive reference within a subprogram as a
792 -- reference (that allows detection of a recursive subprogram
793 -- whose only references are recursive calls as unreferenced).
795 elsif Is_Subprogram (E)
796 and then E = Nearest_Dynamic_Scope (Current_Scope)
800 -- Any other occurrence counts as referencing the entity
802 elsif OK_To_Set_Referenced then
805 -- If variable, this is an OK reference after an assignment
806 -- so we can clear the Last_Assignment indication.
808 if Is_Assignable (E) then
809 Set_Last_Assignment (E, Empty);
814 -- Check for pragma Unreferenced given and reference is within
815 -- this source unit (occasion for possible warning to be issued).
817 if Has_Unreferenced (E)
818 and then In_Same_Extended_Unit (E, N)
820 -- A reference as a named parameter in a call does not count
821 -- as a violation of pragma Unreferenced for this purpose...
823 if Nkind (N) = N_Identifier
824 and then Nkind (Parent (N)) = N_Parameter_Association
825 and then Selector_Name (Parent (N)) = N
829 -- ... Neither does a reference to a variable on the left side
832 elsif Is_On_LHS (N) then
835 -- For entry formals, we want to place the warning message on the
836 -- corresponding entity in the accept statement. The current scope
837 -- is the body of the accept, so we find the formal whose name
838 -- matches that of the entry formal (there is no link between the
839 -- two entities, and the one in the accept statement is only used
840 -- for conformance checking).
842 elsif Ekind (Scope (E)) = E_Entry then
847 BE := First_Entity (Current_Scope);
848 while Present (BE) loop
849 if Chars (BE) = Chars (E) then
850 Error_Msg_NE -- CODEFIX
851 ("??pragma Unreferenced given for&!", N, BE);
859 -- Here we issue the warning, since this is a real reference
862 Error_Msg_NE -- CODEFIX
863 ("?pragma Unreferenced given for&!", N, E);
867 -- If this is a subprogram instance, mark as well the internal
868 -- subprogram in the wrapper package, which may be a visible
871 if Is_Overloadable (E)
872 and then Is_Generic_Instance (E)
873 and then Present (Alias (E))
875 Set_Referenced (Alias (E));
879 -- Generate reference if all conditions are met:
882 -- Cross referencing must be active
886 -- The entity must be one for which we collect references
888 and then Xref_Entity_Letters (Ekind (E)) /= ' '
890 -- Both Sloc values must be set to something sensible
892 and then Sloc (E) > No_Location
893 and then Sloc (N) > No_Location
895 -- Ignore references from within an instance. The only exceptions to
896 -- this are default subprograms, for which we generate an implicit
897 -- reference and compilations in SPARK mode.
900 (Instantiation_Location (Sloc (N)) = No_Location
904 -- Ignore dummy references
908 if Nkind_In (N, N_Identifier,
909 N_Defining_Identifier,
910 N_Defining_Operator_Symbol,
912 N_Defining_Character_Literal)
913 or else Nkind (N) in N_Op
914 or else (Nkind (N) = N_Character_Literal
915 and then Sloc (Entity (N)) /= Standard_Location)
919 elsif Nkind_In (N, N_Expanded_Name, N_Selected_Component) then
920 Nod := Selector_Name (N);
926 -- Normal case of source entity comes from source
928 if Comes_From_Source (E) then
931 -- Entity does not come from source, but is a derived subprogram and
932 -- the derived subprogram comes from source (after one or more
933 -- derivations) in which case the reference is to parent subprogram.
935 elsif Is_Overloadable (E)
936 and then Present (Alias (E))
939 while not Comes_From_Source (Ent) loop
940 if No (Alias (Ent)) then
947 -- The internally created defining entity for a child subprogram
948 -- that has no previous spec has valid references.
950 elsif Is_Overloadable (E)
951 and then Is_Child_Unit (E)
955 -- Ditto for the formals of such a subprogram
957 elsif Is_Overloadable (Scope (E))
958 and then Is_Child_Unit (Scope (E))
962 -- Record components of discriminated subtypes or derived types must
963 -- be treated as references to the original component.
965 elsif Ekind (E) = E_Component
966 and then Comes_From_Source (Original_Record_Component (E))
968 Ent := Original_Record_Component (E);
970 -- If this is an expanded reference to a discriminant, recover the
971 -- original discriminant, which gets the reference.
973 elsif Ekind (E) = E_In_Parameter
974 and then Present (Discriminal_Link (E))
976 Ent := Discriminal_Link (E);
977 Set_Referenced (Ent);
979 -- Ignore reference to any other entity that is not from source
985 -- In SPARK mode, consider the underlying entity renamed instead of
986 -- the renaming, which is needed to compute a valid set of effects
987 -- (reads, writes) for the enclosing subprogram.
990 Ent := Get_Through_Renamings (Ent);
992 -- If no enclosing object, then it could be a reference to any
993 -- location not tracked individually, like heap-allocated data.
994 -- Conservatively approximate this possibility by generating a
995 -- dereference, and return.
998 if Actual_Typ = 'w' then
999 SPARK_Specific.Generate_Dereference (Nod, 'r');
1000 SPARK_Specific.Generate_Dereference (Nod, 'w');
1002 SPARK_Specific.Generate_Dereference (Nod, 'r');
1009 -- Record reference to entity
1012 and then Is_Subprogram (Nod)
1013 and then Present (Overridden_Operation (Nod))
1022 Ref_Scope := SPARK_Specific.Enclosing_Subprogram_Or_Package (Nod);
1023 Ent_Scope := SPARK_Specific.Enclosing_Subprogram_Or_Package (Ent);
1025 -- Since we are reaching through renamings in SPARK mode, we may
1026 -- end up with standard constants. Ignore those.
1028 if Sloc (Ent_Scope) <= Standard_Location
1029 or else Def <= Standard_Location
1038 Eun => Get_Code_Unit (Def),
1039 Lun => Get_Code_Unit (Ref),
1040 Ref_Scope => Ref_Scope,
1041 Ent_Scope => Ent_Scope),
1042 Ent_Scope_File => Get_Code_Unit (Ent));
1045 Ref := Original_Location (Sloc (Nod));
1046 Def := Original_Location (Sloc (Ent));
1048 -- If this is an operator symbol, skip the initial quote for
1049 -- navigation purposes. This is not done for the end label,
1050 -- where we want the actual position after the closing quote.
1055 elsif Nkind (N) = N_Defining_Operator_Symbol
1056 or else Nkind (Nod) = N_Operator_Symbol
1065 Eun => Get_Source_Unit (Def),
1066 Lun => Get_Source_Unit (Ref),
1068 Ent_Scope => Empty),
1069 Ent_Scope_File => No_Unit);
1072 end Generate_Reference;
1074 -----------------------------------
1075 -- Generate_Reference_To_Formals --
1076 -----------------------------------
1078 procedure Generate_Reference_To_Formals (E : Entity_Id) is
1082 if Is_Generic_Subprogram (E) then
1083 Formal := First_Entity (E);
1085 while Present (Formal)
1086 and then not Is_Formal (Formal)
1088 Next_Entity (Formal);
1091 elsif Ekind (E) in Access_Subprogram_Kind then
1092 Formal := First_Formal (Designated_Type (E));
1095 Formal := First_Formal (E);
1098 while Present (Formal) loop
1099 if Ekind (Formal) = E_In_Parameter then
1101 if Nkind (Parameter_Type (Parent (Formal)))
1102 = N_Access_Definition
1104 Generate_Reference (E, Formal, '^', False);
1106 Generate_Reference (E, Formal, '>', False);
1109 elsif Ekind (Formal) = E_In_Out_Parameter then
1110 Generate_Reference (E, Formal, '=', False);
1113 Generate_Reference (E, Formal, '<', False);
1116 Next_Formal (Formal);
1118 end Generate_Reference_To_Formals;
1120 -------------------------------------------
1121 -- Generate_Reference_To_Generic_Formals --
1122 -------------------------------------------
1124 procedure Generate_Reference_To_Generic_Formals (E : Entity_Id) is
1128 Formal := First_Entity (E);
1129 while Present (Formal) loop
1130 if Comes_From_Source (Formal) then
1131 Generate_Reference (E, Formal, 'z', False);
1134 Next_Entity (Formal);
1136 end Generate_Reference_To_Generic_Formals;
1142 function Get_Key (E : Xref_Entry_Number) return Xref_Entry_Number is
1151 function Hash (F : Xref_Entry_Number) return Header_Num is
1152 -- It is unlikely to have two references to the same entity at the same
1153 -- source location, so the hash function depends only on the Ent and Loc
1156 XE : Xref_Entry renames Xrefs.Table (F);
1157 type M is mod 2**32;
1159 H : constant M := M (XE.Key.Ent) + 2 ** 7 * M (abs XE.Key.Loc);
1160 -- It would be more natural to write:
1162 -- H : constant M := M'Mod (XE.Key.Ent) + 2**7 * M'Mod (XE.Key.Loc);
1164 -- But we can't use M'Mod, because it prevents bootstrapping with older
1165 -- compilers. Loc can be negative, so we do "abs" before converting.
1166 -- One day this can be cleaned up ???
1169 return Header_Num (H mod Num_Buckets);
1176 procedure HT_Set_Next (E : Xref_Entry_Number; Next : Xref_Entry_Number) is
1178 Xrefs.Table (E).HTable_Next := Next;
1185 function HT_Next (E : Xref_Entry_Number) return Xref_Entry_Number is
1187 return Xrefs.Table (E).HTable_Next;
1194 procedure Initialize is
1203 function Lt (T1, T2 : Xref_Entry) return Boolean is
1205 -- First test: if entity is in different unit, sort by unit
1207 if T1.Key.Eun /= T2.Key.Eun then
1208 return Dependency_Num (T1.Key.Eun) < Dependency_Num (T2.Key.Eun);
1210 -- Second test: within same unit, sort by entity Sloc
1212 elsif T1.Def /= T2.Def then
1213 return T1.Def < T2.Def;
1215 -- Third test: sort definitions ahead of references
1217 elsif T1.Key.Loc = No_Location then
1220 elsif T2.Key.Loc = No_Location then
1223 -- Fourth test: for same entity, sort by reference location unit
1225 elsif T1.Key.Lun /= T2.Key.Lun then
1226 return Dependency_Num (T1.Key.Lun) < Dependency_Num (T2.Key.Lun);
1228 -- Fifth test: order of location within referencing unit
1230 elsif T1.Key.Loc /= T2.Key.Loc then
1231 return T1.Key.Loc < T2.Key.Loc;
1233 -- Finally, for two locations at the same address, we prefer
1234 -- the one that does NOT have the type 'r' so that a modification
1235 -- or extension takes preference, when there are more than one
1236 -- reference at the same location. As a result, in the case of
1237 -- entities that are in-out actuals, the read reference follows
1238 -- the modify reference.
1241 return T2.Key.Typ = 'r';
1245 -----------------------
1246 -- Output_References --
1247 -----------------------
1249 procedure Output_References is
1251 procedure Get_Type_Reference
1253 Tref : out Entity_Id;
1254 Left : out Character;
1255 Right : out Character);
1256 -- Given an Entity_Id Ent, determines whether a type reference is
1257 -- required. If so, Tref is set to the entity for the type reference
1258 -- and Left and Right are set to the left/right brackets to be output
1259 -- for the reference. If no type reference is required, then Tref is
1260 -- set to Empty, and Left/Right are set to space.
1262 procedure Output_Import_Export_Info (Ent : Entity_Id);
1263 -- Output language and external name information for an interfaced
1264 -- entity, using the format <language, external_name>.
1266 ------------------------
1267 -- Get_Type_Reference --
1268 ------------------------
1270 procedure Get_Type_Reference
1272 Tref : out Entity_Id;
1273 Left : out Character;
1274 Right : out Character)
1279 -- See if we have a type reference
1288 -- Processing for types
1290 if Is_Type (Tref) then
1292 -- Case of base type
1294 if Base_Type (Tref) = Tref then
1296 -- If derived, then get first subtype
1298 if Tref /= Etype (Tref) then
1299 Tref := First_Subtype (Etype (Tref));
1301 -- Set brackets for derived type, but don't override
1302 -- pointer case since the fact that something is a
1303 -- pointer is more important.
1310 -- If the completion of a private type is itself a derived
1311 -- type, we need the parent of the full view.
1313 elsif Is_Private_Type (Tref)
1314 and then Present (Full_View (Tref))
1315 and then Etype (Full_View (Tref)) /= Full_View (Tref)
1317 Tref := Etype (Full_View (Tref));
1324 -- If non-derived pointer, get directly designated type.
1325 -- If the type has a full view, all references are on the
1326 -- partial view that is seen first.
1328 elsif Is_Access_Type (Tref) then
1329 Tref := Directly_Designated_Type (Tref);
1333 elsif Is_Private_Type (Tref)
1334 and then Present (Full_View (Tref))
1336 if Is_Access_Type (Full_View (Tref)) then
1337 Tref := Directly_Designated_Type (Full_View (Tref));
1341 -- If the full view is an array type, we also retrieve
1342 -- the corresponding component type, because the ali
1343 -- entry already indicates that this is an array.
1345 elsif Is_Array_Type (Full_View (Tref)) then
1346 Tref := Component_Type (Full_View (Tref));
1351 -- If non-derived array, get component type. Skip component
1352 -- type for case of String or Wide_String, saves worthwhile
1355 elsif Is_Array_Type (Tref)
1356 and then Tref /= Standard_String
1357 and then Tref /= Standard_Wide_String
1359 Tref := Component_Type (Tref);
1363 -- For other non-derived base types, nothing
1369 -- For a subtype, go to ancestor subtype
1372 Tref := Ancestor_Subtype (Tref);
1374 -- If no ancestor subtype, go to base type
1377 Tref := Base_Type (Sav);
1381 -- For objects, functions, enum literals, just get type from
1384 elsif Is_Object (Tref)
1385 or else Ekind (Tref) = E_Enumeration_Literal
1386 or else Ekind (Tref) = E_Function
1387 or else Ekind (Tref) = E_Operator
1389 Tref := Etype (Tref);
1391 -- Another special case: an object of a classwide type
1392 -- initialized with a tag-indeterminate call gets a subtype
1393 -- of the classwide type during expansion. See if the original
1394 -- type in the declaration is named, and return it instead
1395 -- of going to the root type.
1397 if Ekind (Tref) = E_Class_Wide_Subtype
1398 and then Nkind (Parent (Ent)) = N_Object_Declaration
1400 Nkind (Original_Node (Object_Definition (Parent (Ent))))
1405 (Original_Node ((Object_Definition (Parent (Ent)))));
1408 -- For anything else, exit
1414 -- Exit if no type reference, or we are stuck in some loop trying
1415 -- to find the type reference, or if the type is standard void
1416 -- type (the latter is an implementation artifact that should not
1417 -- show up in the generated cross-references).
1421 or else Tref = Standard_Void_Type;
1423 -- If we have a usable type reference, return, otherwise keep
1424 -- looking for something useful (we are looking for something
1425 -- that either comes from source or standard)
1427 if Sloc (Tref) = Standard_Location
1428 or else Comes_From_Source (Tref)
1430 -- If the reference is a subtype created for a generic actual,
1431 -- go actual directly, the inner subtype is not user visible.
1433 if Nkind (Parent (Tref)) = N_Subtype_Declaration
1434 and then not Comes_From_Source (Parent (Tref))
1436 (Is_Wrapper_Package (Scope (Tref))
1437 or else Is_Generic_Instance (Scope (Tref)))
1439 Tref := First_Subtype (Base_Type (Tref));
1446 -- If we fall through the loop, no type reference
1451 end Get_Type_Reference;
1453 -------------------------------
1454 -- Output_Import_Export_Info --
1455 -------------------------------
1457 procedure Output_Import_Export_Info (Ent : Entity_Id) is
1458 Language_Name : Name_Id;
1459 Conv : constant Convention_Id := Convention (Ent);
1462 -- Generate language name from convention
1464 if Conv = Convention_C then
1465 Language_Name := Name_C;
1467 elsif Conv = Convention_CPP then
1468 Language_Name := Name_CPP;
1470 elsif Conv = Convention_Ada then
1471 Language_Name := Name_Ada;
1474 -- For the moment we ignore all other cases ???
1479 Write_Info_Char ('<');
1480 Get_Unqualified_Name_String (Language_Name);
1482 for J in 1 .. Name_Len loop
1483 Write_Info_Char (Name_Buffer (J));
1486 if Present (Interface_Name (Ent)) then
1487 Write_Info_Char (',');
1488 String_To_Name_Buffer (Strval (Interface_Name (Ent)));
1490 for J in 1 .. Name_Len loop
1491 Write_Info_Char (Name_Buffer (J));
1495 Write_Info_Char ('>');
1496 end Output_Import_Export_Info;
1498 -- Start of processing for Output_References
1501 -- First we add references to the primitive operations of tagged types
1502 -- declared in the main unit.
1504 Handle_Prim_Ops : declare
1508 for J in 1 .. Xrefs.Last loop
1509 Ent := Xrefs.Table (J).Key.Ent;
1512 and then Is_Tagged_Type (Ent)
1513 and then Is_Base_Type (Ent)
1514 and then In_Extended_Main_Source_Unit (Ent)
1516 Generate_Prim_Op_References (Ent);
1519 end Handle_Prim_Ops;
1521 -- Before we go ahead and output the references we have a problem
1522 -- that needs dealing with. So far we have captured things that are
1523 -- definitely referenced by the main unit, or defined in the main
1524 -- unit. That's because we don't want to clutter up the ali file
1525 -- for this unit with definition lines for entities in other units
1526 -- that are not referenced.
1528 -- But there is a glitch. We may reference an entity in another unit,
1529 -- and it may have a type reference to an entity that is not directly
1530 -- referenced in the main unit, which may mean that there is no xref
1531 -- entry for this entity yet in the list of references.
1533 -- If we don't do something about this, we will end with an orphan type
1534 -- reference, i.e. it will point to an entity that does not appear
1535 -- within the generated references in the ali file. That is not good for
1536 -- tools using the xref information.
1538 -- To fix this, we go through the references adding definition entries
1539 -- for any unreferenced entities that can be referenced in a type
1540 -- reference. There is a recursion problem here, and that is dealt with
1541 -- by making sure that this traversal also traverses any entries that
1542 -- get added by the traversal.
1544 Handle_Orphan_Type_References : declare
1550 pragma Warnings (Off, L);
1551 pragma Warnings (Off, R);
1553 procedure New_Entry (E : Entity_Id);
1554 -- Make an additional entry into the Xref table for a type entity
1555 -- that is related to the current entity (parent, type ancestor,
1556 -- progenitor, etc.).
1562 procedure New_Entry (E : Entity_Id) is
1564 pragma Assert (Present (E));
1566 if not Has_Xref_Entry (Implementation_Base_Type (E))
1567 and then Sloc (E) > No_Location
1572 Typ => Character'First,
1573 Eun => Get_Source_Unit (Original_Location (Sloc (E))),
1576 Ent_Scope => Empty),
1577 Ent_Scope_File => No_Unit);
1581 -- Start of processing for Handle_Orphan_Type_References
1584 -- Note that this is not a for loop for a very good reason. The
1585 -- processing of items in the table can add new items to the table,
1586 -- and they must be processed as well.
1589 while J <= Xrefs.Last loop
1590 Ent := Xrefs.Table (J).Key.Ent;
1591 Get_Type_Reference (Ent, Tref, L, R);
1594 and then not Has_Xref_Entry (Tref)
1595 and then Sloc (Tref) > No_Location
1599 if Is_Record_Type (Ent)
1600 and then Present (Interfaces (Ent))
1602 -- Add an entry for each one of the given interfaces
1603 -- implemented by type Ent.
1606 Elmt : Elmt_Id := First_Elmt (Interfaces (Ent));
1608 while Present (Elmt) loop
1609 New_Entry (Node (Elmt));
1616 -- Collect inherited primitive operations that may be declared in
1617 -- another unit and have no visible reference in the current one.
1620 and then Is_Tagged_Type (Ent)
1621 and then Is_Derived_Type (Ent)
1622 and then Is_Base_Type (Ent)
1623 and then In_Extended_Main_Source_Unit (Ent)
1626 Op_List : constant Elist_Id := Primitive_Operations (Ent);
1630 function Parent_Op (E : Entity_Id) return Entity_Id;
1631 -- Find original operation, which may be inherited through
1632 -- several derivations.
1634 function Parent_Op (E : Entity_Id) return Entity_Id is
1635 Orig_Op : constant Entity_Id := Alias (E);
1638 if No (Orig_Op) then
1641 elsif not Comes_From_Source (E)
1642 and then not Has_Xref_Entry (Orig_Op)
1643 and then Comes_From_Source (Orig_Op)
1647 return Parent_Op (Orig_Op);
1652 Op := First_Elmt (Op_List);
1653 while Present (Op) loop
1654 Prim := Parent_Op (Node (Op));
1656 if Present (Prim) then
1660 Typ => Character'First,
1661 Eun => Get_Source_Unit (Sloc (Prim)),
1664 Ent_Scope => Empty),
1665 Ent_Scope_File => No_Unit);
1675 end Handle_Orphan_Type_References;
1677 -- Now we have all the references, including those for any embedded
1678 -- type references, so we can sort them, and output them.
1680 Output_Refs : declare
1682 Nrefs : constant Nat := Xrefs.Last;
1683 -- Number of references in table
1685 Rnums : array (0 .. Nrefs) of Nat;
1686 -- This array contains numbers of references in the Xrefs table.
1687 -- This list is sorted in output order. The extra 0'th entry is
1688 -- convenient for the call to sort. When we sort the table, we
1689 -- move the entries in Rnums around, but we do not move the
1690 -- original table entries.
1692 Curxu : Unit_Number_Type;
1693 -- Current xref unit
1695 Curru : Unit_Number_Type;
1696 -- Current reference unit for one entity
1701 Curnam : String (1 .. Name_Buffer'Length);
1703 -- Simple name and length of current entity
1705 Curdef : Source_Ptr;
1706 -- Original source location for current entity
1709 -- Current reference location
1712 -- Entity type character
1715 -- reference kind of previous reference
1721 -- Renaming reference
1723 Trunit : Unit_Number_Type;
1724 -- Unit number for type reference
1726 function Lt (Op1, Op2 : Natural) return Boolean;
1727 -- Comparison function for Sort call
1729 function Name_Change (X : Entity_Id) return Boolean;
1730 -- Determines if entity X has a different simple name from Curent
1732 procedure Move (From : Natural; To : Natural);
1733 -- Move procedure for Sort call
1735 package Sorting is new GNAT.Heap_Sort_G (Move, Lt);
1741 function Lt (Op1, Op2 : Natural) return Boolean is
1742 T1 : Xref_Entry renames Xrefs.Table (Rnums (Nat (Op1)));
1743 T2 : Xref_Entry renames Xrefs.Table (Rnums (Nat (Op2)));
1753 procedure Move (From : Natural; To : Natural) is
1755 Rnums (Nat (To)) := Rnums (Nat (From));
1762 -- Why a string comparison here??? Why not compare Name_Id values???
1764 function Name_Change (X : Entity_Id) return Boolean is
1766 Get_Unqualified_Name_String (Chars (X));
1768 if Name_Len /= Curlen then
1771 return Name_Buffer (1 .. Curlen) /= Curnam (1 .. Curlen);
1775 -- Start of processing for Output_Refs
1778 -- Capture the definition Sloc values. We delay doing this till now,
1779 -- since at the time the reference or definition is made, private
1780 -- types may be swapped, and the Sloc value may be incorrect. We
1781 -- also set up the pointer vector for the sort.
1783 -- For user-defined operators we need to skip the initial quote and
1784 -- point to the first character of the name, for navigation purposes.
1786 for J in 1 .. Nrefs loop
1788 E : constant Entity_Id := Xrefs.Table (J).Key.Ent;
1789 Loc : constant Source_Ptr := Original_Location (Sloc (E));
1794 if Nkind (E) = N_Defining_Operator_Symbol then
1795 Xrefs.Table (J).Def := Loc + 1;
1797 Xrefs.Table (J).Def := Loc;
1802 -- Sort the references
1804 Sorting.Sort (Integer (Nrefs));
1806 -- Initialize loop through references
1810 Curdef := No_Location;
1812 Crloc := No_Location;
1815 -- Loop to output references
1817 for Refno in 1 .. Nrefs loop
1818 Output_One_Ref : declare
1821 XE : Xref_Entry renames Xrefs.Table (Rnums (Refno));
1822 -- The current entry to be accessed
1826 -- Used for {} or <> or () for type reference
1828 procedure Check_Type_Reference
1830 List_Interface : Boolean);
1831 -- Find whether there is a meaningful type reference for
1832 -- Ent, and display it accordingly. If List_Interface is
1833 -- true, then Ent is a progenitor interface of the current
1834 -- type entity being listed. In that case list it as is,
1835 -- without looking for a type reference for it.
1837 procedure Output_Instantiation_Refs (Loc : Source_Ptr);
1838 -- Recursive procedure to output instantiation references for
1839 -- the given source ptr in [file|line[...]] form. No output
1840 -- if the given location is not a generic template reference.
1842 procedure Output_Overridden_Op (Old_E : Entity_Id);
1843 -- For a subprogram that is overriding, display information
1844 -- about the inherited operation that it overrides.
1846 --------------------------
1847 -- Check_Type_Reference --
1848 --------------------------
1850 procedure Check_Type_Reference
1852 List_Interface : Boolean)
1855 if List_Interface then
1857 -- This is a progenitor interface of the type for which
1858 -- xref information is being generated.
1865 Get_Type_Reference (Ent, Tref, Left, Right);
1868 if Present (Tref) then
1870 -- Case of standard entity, output name
1872 if Sloc (Tref) = Standard_Location then
1873 Write_Info_Char (Left);
1874 Write_Info_Name (Chars (Tref));
1875 Write_Info_Char (Right);
1877 -- Case of source entity, output location
1880 Write_Info_Char (Left);
1881 Trunit := Get_Source_Unit (Sloc (Tref));
1883 if Trunit /= Curxu then
1884 Write_Info_Nat (Dependency_Num (Trunit));
1885 Write_Info_Char ('|');
1889 (Int (Get_Logical_Line_Number (Sloc (Tref))));
1897 Ctyp := Xref_Entity_Letters (Ekind (Ent));
1900 and then Present (Full_View (Ent))
1902 Ent := Underlying_Type (Ent);
1904 if Present (Ent) then
1905 Ctyp := Xref_Entity_Letters (Ekind (Ent));
1909 Write_Info_Char (Ctyp);
1913 (Int (Get_Column_Number (Sloc (Tref))));
1915 -- If the type comes from an instantiation, add the
1916 -- corresponding info.
1918 Output_Instantiation_Refs (Sloc (Tref));
1919 Write_Info_Char (Right);
1922 end Check_Type_Reference;
1924 -------------------------------
1925 -- Output_Instantiation_Refs --
1926 -------------------------------
1928 procedure Output_Instantiation_Refs (Loc : Source_Ptr) is
1929 Iloc : constant Source_Ptr := Instantiation_Location (Loc);
1930 Lun : Unit_Number_Type;
1931 Cu : constant Unit_Number_Type := Curru;
1934 -- Nothing to do if this is not an instantiation
1936 if Iloc = No_Location then
1940 -- Output instantiation reference
1942 Write_Info_Char ('[');
1943 Lun := Get_Source_Unit (Iloc);
1945 if Lun /= Curru then
1947 Write_Info_Nat (Dependency_Num (Curru));
1948 Write_Info_Char ('|');
1951 Write_Info_Nat (Int (Get_Logical_Line_Number (Iloc)));
1953 -- Recursive call to get nested instantiations
1955 Output_Instantiation_Refs (Iloc);
1957 -- Output final ] after call to get proper nesting
1959 Write_Info_Char (']');
1962 end Output_Instantiation_Refs;
1964 --------------------------
1965 -- Output_Overridden_Op --
1966 --------------------------
1968 procedure Output_Overridden_Op (Old_E : Entity_Id) is
1972 -- The overridden operation has an implicit declaration
1973 -- at the point of derivation. What we want to display
1974 -- is the original operation, which has the actual body
1975 -- (or abstract declaration) that is being overridden.
1976 -- The overridden operation is not always set, e.g. when
1977 -- it is a predefined operator.
1982 -- Follow alias chain if one is present
1984 elsif Present (Alias (Old_E)) then
1986 -- The subprogram may have been implicitly inherited
1987 -- through several levels of derivation, so find the
1988 -- ultimate (source) ancestor.
1990 Op := Ultimate_Alias (Old_E);
1992 -- Normal case of no alias present. We omit generated
1993 -- primitives like tagged equality, that have no source
2001 and then Sloc (Op) /= Standard_Location
2002 and then Comes_From_Source (Op)
2005 Loc : constant Source_Ptr := Sloc (Op);
2006 Par_Unit : constant Unit_Number_Type :=
2007 Get_Source_Unit (Loc);
2010 Write_Info_Char ('<');
2012 if Par_Unit /= Curxu then
2013 Write_Info_Nat (Dependency_Num (Par_Unit));
2014 Write_Info_Char ('|');
2017 Write_Info_Nat (Int (Get_Logical_Line_Number (Loc)));
2018 Write_Info_Char ('p');
2019 Write_Info_Nat (Int (Get_Column_Number (Loc)));
2020 Write_Info_Char ('>');
2023 end Output_Overridden_Op;
2025 -- Start of processing for Output_One_Ref
2029 Ctyp := Xref_Entity_Letters (Ekind (Ent));
2031 -- Skip reference if it is the only reference to an entity,
2032 -- and it is an END line reference, and the entity is not in
2033 -- the current extended source. This prevents junk entries
2034 -- consisting only of packages with END lines, where no
2035 -- entity from the package is actually referenced.
2038 and then Ent /= Curent
2039 and then (Refno = Nrefs
2041 Ent /= Xrefs.Table (Rnums (Refno + 1)).Key.Ent)
2042 and then not In_Extended_Main_Source_Unit (Ent)
2047 -- For private type, get full view type
2050 and then Present (Full_View (XE.Key.Ent))
2052 Ent := Underlying_Type (Ent);
2054 if Present (Ent) then
2055 Ctyp := Xref_Entity_Letters (Ekind (Ent));
2059 -- Special exception for Boolean
2061 if Ctyp = 'E' and then Is_Boolean_Type (Ent) then
2065 -- For variable reference, get corresponding type
2068 Ent := Etype (XE.Key.Ent);
2069 Ctyp := Fold_Lower (Xref_Entity_Letters (Ekind (Ent)));
2071 -- If variable is private type, get full view type
2074 and then Present (Full_View (Etype (XE.Key.Ent)))
2076 Ent := Underlying_Type (Etype (XE.Key.Ent));
2078 if Present (Ent) then
2079 Ctyp := Fold_Lower (Xref_Entity_Letters (Ekind (Ent)));
2082 elsif Is_Generic_Type (Ent) then
2084 -- If the type of the entity is a generic private type,
2085 -- there is no usable full view, so retain the indication
2086 -- that this is an object.
2091 -- Special handling for access parameters and objects and
2092 -- components of an anonymous access type.
2094 if Ekind_In (Etype (XE.Key.Ent),
2095 E_Anonymous_Access_Type,
2096 E_Anonymous_Access_Subprogram_Type,
2097 E_Anonymous_Access_Protected_Subprogram_Type)
2099 if Is_Formal (XE.Key.Ent)
2102 (XE.Key.Ent, E_Variable, E_Constant, E_Component)
2107 -- Special handling for Boolean
2109 elsif Ctyp = 'e' and then Is_Boolean_Type (Ent) then
2114 -- Special handling for abstract types and operations
2116 if Is_Overloadable (XE.Key.Ent)
2117 and then Is_Abstract_Subprogram (XE.Key.Ent)
2120 Ctyp := 'x'; -- Abstract procedure
2122 elsif Ctyp = 'V' then
2123 Ctyp := 'y'; -- Abstract function
2126 elsif Is_Type (XE.Key.Ent)
2127 and then Is_Abstract_Type (XE.Key.Ent)
2129 if Is_Interface (XE.Key.Ent) then
2132 elsif Ctyp = 'R' then
2133 Ctyp := 'H'; -- Abstract type
2137 -- Only output reference if interesting type of entity
2141 -- Suppress references to object definitions, used for local
2144 or else XE.Key.Typ = 'D'
2145 or else XE.Key.Typ = 'I'
2147 -- Suppress self references, except for bodies that act as
2150 or else (XE.Key.Loc = XE.Def
2153 or else not Is_Subprogram (XE.Key.Ent)))
2155 -- Also suppress definitions of body formals (we only
2156 -- treat these as references, and the references were
2157 -- separately recorded).
2159 or else (Is_Formal (XE.Key.Ent)
2160 and then Present (Spec_Entity (XE.Key.Ent)))
2165 -- Start new Xref section if new xref unit
2167 if XE.Key.Eun /= Curxu then
2168 if Write_Info_Col > 1 then
2172 Curxu := XE.Key.Eun;
2174 Write_Info_Initiate ('X');
2175 Write_Info_Char (' ');
2176 Write_Info_Nat (Dependency_Num (XE.Key.Eun));
2177 Write_Info_Char (' ');
2179 (Reference_Name (Source_Index (XE.Key.Eun)));
2182 -- Start new Entity line if new entity. Note that we
2183 -- consider two entities the same if they have the same
2184 -- name and source location. This causes entities in
2185 -- instantiations to be treated as though they referred
2190 (XE.Key.Ent /= Curent
2192 (Name_Change (XE.Key.Ent) or else XE.Def /= Curdef))
2194 Curent := XE.Key.Ent;
2197 Get_Unqualified_Name_String (Chars (XE.Key.Ent));
2199 Curnam (1 .. Curlen) := Name_Buffer (1 .. Curlen);
2201 if Write_Info_Col > 1 then
2205 -- Write column number information
2207 Write_Info_Nat (Int (Get_Logical_Line_Number (XE.Def)));
2208 Write_Info_Char (Ctyp);
2209 Write_Info_Nat (Int (Get_Column_Number (XE.Def)));
2211 -- Write level information
2213 Write_Level_Info : declare
2214 function Is_Visible_Generic_Entity
2215 (E : Entity_Id) return Boolean;
2216 -- Check whether E is declared in the visible part
2217 -- of a generic package. For source navigation
2218 -- purposes, treat this as a visible entity.
2220 function Is_Private_Record_Component
2221 (E : Entity_Id) return Boolean;
2222 -- Check whether E is a non-inherited component of a
2223 -- private extension. Even if the enclosing record is
2224 -- public, we want to treat the component as private
2225 -- for navigation purposes.
2227 ---------------------------------
2228 -- Is_Private_Record_Component --
2229 ---------------------------------
2231 function Is_Private_Record_Component
2232 (E : Entity_Id) return Boolean
2234 S : constant Entity_Id := Scope (E);
2237 Ekind (E) = E_Component
2238 and then Nkind (Declaration_Node (S)) =
2239 N_Private_Extension_Declaration
2240 and then Original_Record_Component (E) = E;
2241 end Is_Private_Record_Component;
2243 -------------------------------
2244 -- Is_Visible_Generic_Entity --
2245 -------------------------------
2247 function Is_Visible_Generic_Entity
2248 (E : Entity_Id) return Boolean
2253 -- The Present check here is an error defense
2255 if Present (Scope (E))
2256 and then Ekind (Scope (E)) /= E_Generic_Package
2262 while Present (Par) loop
2264 Nkind (Par) = N_Generic_Package_Declaration
2266 -- Entity is a generic formal
2271 Nkind (Parent (Par)) = N_Package_Specification
2274 Is_List_Member (Par)
2275 and then List_Containing (Par) =
2276 Visible_Declarations (Parent (Par));
2278 Par := Parent (Par);
2283 end Is_Visible_Generic_Entity;
2285 -- Start of processing for Write_Level_Info
2288 if Is_Hidden (Curent)
2289 or else Is_Private_Record_Component (Curent)
2291 Write_Info_Char (' ');
2295 or else Is_Visible_Generic_Entity (Curent)
2297 Write_Info_Char ('*');
2300 Write_Info_Char (' ');
2302 end Write_Level_Info;
2304 -- Output entity name. We use the occurrence from the
2305 -- actual source program at the definition point.
2308 Ent_Name : constant String :=
2309 Exact_Source_Name (Sloc (XE.Key.Ent));
2311 for C in Ent_Name'Range loop
2312 Write_Info_Char (Ent_Name (C));
2316 -- See if we have a renaming reference
2318 if Is_Object (XE.Key.Ent)
2319 and then Present (Renamed_Object (XE.Key.Ent))
2321 Rref := Renamed_Object (XE.Key.Ent);
2323 elsif Is_Overloadable (XE.Key.Ent)
2324 and then Nkind (Parent (Declaration_Node (XE.Key.Ent)))
2325 = N_Subprogram_Renaming_Declaration
2327 Rref := Name (Parent (Declaration_Node (XE.Key.Ent)));
2329 elsif Ekind (XE.Key.Ent) = E_Package
2330 and then Nkind (Declaration_Node (XE.Key.Ent)) =
2331 N_Package_Renaming_Declaration
2333 Rref := Name (Declaration_Node (XE.Key.Ent));
2339 if Present (Rref) then
2340 if Nkind (Rref) = N_Expanded_Name then
2341 Rref := Selector_Name (Rref);
2344 if Nkind (Rref) = N_Identifier
2345 or else Nkind (Rref) = N_Operator_Symbol
2349 -- For renamed array components, use the array name
2350 -- for the renamed entity, which reflect the fact that
2351 -- in general the whole array is aliased.
2353 elsif Nkind (Rref) = N_Indexed_Component then
2354 if Nkind (Prefix (Rref)) = N_Identifier then
2355 Rref := Prefix (Rref);
2356 elsif Nkind (Prefix (Rref)) = N_Expanded_Name then
2357 Rref := Selector_Name (Prefix (Rref));
2367 -- Write out renaming reference if we have one
2369 if Present (Rref) then
2370 Write_Info_Char ('=');
2372 (Int (Get_Logical_Line_Number (Sloc (Rref))));
2373 Write_Info_Char (':');
2375 (Int (Get_Column_Number (Sloc (Rref))));
2378 -- Indicate that the entity is in the unit of the current
2383 -- Write out information about generic parent, if entity
2386 if Is_Generic_Instance (XE.Key.Ent) then
2388 Gen_Par : constant Entity_Id :=
2391 (Unit_Declaration_Node
2393 Loc : constant Source_Ptr := Sloc (Gen_Par);
2394 Gen_U : constant Unit_Number_Type :=
2395 Get_Source_Unit (Loc);
2398 Write_Info_Char ('[');
2400 if Curru /= Gen_U then
2401 Write_Info_Nat (Dependency_Num (Gen_U));
2402 Write_Info_Char ('|');
2406 (Int (Get_Logical_Line_Number (Loc)));
2407 Write_Info_Char (']');
2411 -- See if we have a type reference and if so output
2413 Check_Type_Reference (XE.Key.Ent, False);
2415 -- Additional information for types with progenitors
2417 if Is_Record_Type (XE.Key.Ent)
2418 and then Present (Interfaces (XE.Key.Ent))
2422 First_Elmt (Interfaces (XE.Key.Ent));
2424 while Present (Elmt) loop
2425 Check_Type_Reference (Node (Elmt), True);
2430 -- For array types, list index types as well. (This is
2431 -- not C, indexes have distinct types).
2433 elsif Is_Array_Type (XE.Key.Ent) then
2437 Indx := First_Index (XE.Key.Ent);
2438 while Present (Indx) loop
2439 Check_Type_Reference
2440 (First_Subtype (Etype (Indx)), True);
2446 -- If the entity is an overriding operation, write info
2447 -- on operation that was overridden.
2449 if Is_Subprogram (XE.Key.Ent)
2450 and then Present (Overridden_Operation (XE.Key.Ent))
2452 Output_Overridden_Op
2453 (Overridden_Operation (XE.Key.Ent));
2456 -- End of processing for entity output
2458 Crloc := No_Location;
2461 -- Output the reference if it is not as the same location
2462 -- as the previous one, or it is a read-reference that
2463 -- indicates that the entity is an in-out actual in a call.
2465 if XE.Key.Loc /= No_Location
2467 (XE.Key.Loc /= Crloc
2468 or else (Prevt = 'm' and then XE.Key.Typ = 'r'))
2470 Crloc := XE.Key.Loc;
2471 Prevt := XE.Key.Typ;
2473 -- Start continuation if line full, else blank
2475 if Write_Info_Col > 72 then
2477 Write_Info_Initiate ('.');
2480 Write_Info_Char (' ');
2482 -- Output file number if changed
2484 if XE.Key.Lun /= Curru then
2485 Curru := XE.Key.Lun;
2486 Write_Info_Nat (Dependency_Num (Curru));
2487 Write_Info_Char ('|');
2491 (Int (Get_Logical_Line_Number (XE.Key.Loc)));
2492 Write_Info_Char (XE.Key.Typ);
2494 if Is_Overloadable (XE.Key.Ent) then
2495 if (Is_Imported (XE.Key.Ent) and then XE.Key.Typ = 'b')
2497 (Is_Exported (XE.Key.Ent) and then XE.Key.Typ = 'i')
2499 Output_Import_Export_Info (XE.Key.Ent);
2503 Write_Info_Nat (Int (Get_Column_Number (XE.Key.Loc)));
2505 Output_Instantiation_Refs (Sloc (XE.Key.Ent));
2516 end Output_References;
2518 -- Start of elaboration for Lib.Xref
2521 -- Reset is necessary because Elmt_Ptr does not default to Null_Ptr,
2522 -- because it's not an access type.