-- --
-- B o d y --
-- --
--- Copyright (C) 1998-2006, Free Software Foundation, Inc. --
+-- Copyright (C) 1998-2009, Free Software Foundation, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
--- ware Foundation; either version 2, or (at your option) any later ver- --
+-- ware Foundation; either version 3, or (at your option) any later ver- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
--- Public License distributed with GNAT; see file COPYING. If not, write --
--- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
--- Boston, MA 02110-1301, USA. --
+-- Public License distributed with GNAT; see file COPYING3. If not, go to --
+-- http://www.gnu.org/licenses for a complete copy of the license. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
with Elists; use Elists;
with Errout; use Errout;
with Lib.Util; use Lib.Util;
-with Namet; use Namet;
with Nlists; use Nlists;
with Opt; use Opt;
with Restrict; use Restrict;
with Rident; use Rident;
with Sem; use Sem;
+with Sem_Aux; use Sem_Aux;
with Sem_Prag; use Sem_Prag;
with Sem_Util; use Sem_Util;
with Sem_Warn; use Sem_Warn;
with Table; use Table;
with Widechar; use Widechar;
-with GNAT.Heap_Sort_A;
+with GNAT.Heap_Sort_G;
package body Lib.Xref is
-- Entity referenced (E parameter to Generate_Reference)
Def : Source_Ptr;
- -- Original source location for entity being referenced. Note that
- -- these values are used only during the output process, they are
- -- not set when the entries are originally built. This is because
- -- private entities can be swapped when the initial call is made.
+ -- Original source location for entity being referenced. Note that these
+ -- values are used only during the output process, they are not set when
+ -- the entries are originally built. This is because private entities
+ -- can be swapped when the initial call is made.
Loc : Source_Ptr;
-- Location of reference (Original_Location (Sloc field of N parameter
Table_Increment => Alloc.Xrefs_Increment,
Table_Name => "Xrefs");
+ ------------------------
+ -- Local Subprograms --
+ ------------------------
+
+ procedure Generate_Prim_Op_References (Typ : Entity_Id);
+ -- For a tagged type, generate implicit references to its primitive
+ -- operations, for source navigation. This is done right before emitting
+ -- cross-reference information rather than at the freeze point of the type
+ -- in order to handle late bodies that are primitive operations.
+
-------------------------
-- Generate_Definition --
-------------------------
begin
pragma Assert (Nkind (E) in N_Entity);
- -- Note that we do not test Xref_Entity_Letters here. It is too
- -- early to do so, since we are often called before the entity
- -- is fully constructed, so that the Ekind is still E_Void.
+ -- Note that we do not test Xref_Entity_Letters here. It is too early
+ -- to do so, since we are often called before the entity is fully
+ -- constructed, so that the Ekind is still E_Void.
if Opt.Xref_Active
-- Definition must come from source
- -- We make an exception for subprogram child units that have no
- -- spec. For these we generate a subprogram declaration for library
- -- use, and the corresponding entity does not come from source.
+ -- We make an exception for subprogram child units that have no spec.
+ -- For these we generate a subprogram declaration for library use,
+ -- and the corresponding entity does not come from source.
-- Nevertheless, all references will be attached to it and we have
-- to treat is as coming from user code.
return;
end if;
- -- If the operator is not a Standard operator, then we generate
- -- a real reference to the user defined operator.
+ -- If the operator is not a Standard operator, then we generate a real
+ -- reference to the user defined operator.
if Sloc (Entity (N)) /= Standard_Location then
Generate_Reference (Entity (N), N);
- -- A reference to an implicit inequality operator is a also a
- -- reference to the user-defined equality.
+ -- A reference to an implicit inequality operator is also a reference
+ -- to the user-defined equality.
if Nkind (N) = N_Op_Ne
and then not Comes_From_Source (Entity (N))
Generate_Reference (Corresponding_Equality (Entity (N)), N);
end if;
- -- For the case of Standard operators, we mark the result type
- -- as referenced. This ensures that in the case where we are
- -- using a derived operator, we mark an entity of the unit that
- -- implicitly defines this operator as used. Otherwise we may
- -- think that no entity of the unit is used. The actual entity
- -- marked as referenced is the first subtype, which is the user
- -- defined entity that is relevant.
+ -- For the case of Standard operators, we mark the result type as
+ -- referenced. This ensures that in the case where we are using a
+ -- derived operator, we mark an entity of the unit that implicitly
+ -- defines this operator as used. Otherwise we may think that no entity
+ -- of the unit is used. The actual entity marked as referenced is the
+ -- first subtype, which is the relevant user defined entity.
- -- Note: we only do this for operators that come from source.
- -- The generated code sometimes reaches for entities that do
- -- not need to be explicitly visible (for example, when we
- -- expand the code for comparing two record types, the fields
- -- of the record may not be visible).
+ -- Note: we only do this for operators that come from source. The
+ -- generated code sometimes reaches for entities that do not need to be
+ -- explicitly visible (for example, when we expand the code for
+ -- comparing two record objects, the fields of the record may not be
+ -- visible).
elsif Comes_From_Source (N) then
Set_Referenced (First_Subtype (T));
end if;
end Generate_Operator_Reference;
+ ---------------------------------
+ -- Generate_Prim_Op_References --
+ ---------------------------------
+
+ procedure Generate_Prim_Op_References (Typ : Entity_Id) is
+ Base_T : Entity_Id;
+ Prim : Elmt_Id;
+ Prim_List : Elist_Id;
+ Ent : Entity_Id;
+
+ begin
+ -- Handle subtypes of synchronized types
+
+ if Ekind (Typ) = E_Protected_Subtype
+ or else Ekind (Typ) = E_Task_Subtype
+ then
+ Base_T := Etype (Typ);
+ else
+ Base_T := Typ;
+ end if;
+
+ -- References to primitive operations are only relevant for tagged types
+
+ if not Is_Tagged_Type (Base_T)
+ or else Is_Class_Wide_Type (Base_T)
+ then
+ return;
+ end if;
+
+ -- Ada 2005 (AI-345): For synchronized types generate reference
+ -- to the wrapper that allow us to dispatch calls through their
+ -- implemented abstract interface types.
+
+ -- The check for Present here is to protect against previously
+ -- reported critical errors.
+
+ if Is_Concurrent_Type (Base_T)
+ and then Present (Corresponding_Record_Type (Base_T))
+ then
+ Prim_List := Primitive_Operations
+ (Corresponding_Record_Type (Base_T));
+ else
+ Prim_List := Primitive_Operations (Base_T);
+ end if;
+
+ if No (Prim_List) then
+ return;
+ end if;
+
+ Prim := First_Elmt (Prim_List);
+ while Present (Prim) loop
+
+ -- If the operation is derived, get the original for cross-reference
+ -- reference purposes (it is the original for which we want the xref
+ -- and for which the comes_from_source test must be performed).
+
+ Ent := Node (Prim);
+ while Present (Alias (Ent)) loop
+ Ent := Alias (Ent);
+ end loop;
+
+ Generate_Reference (Typ, Ent, 'p', Set_Ref => False);
+ Next_Elmt (Prim);
+ end loop;
+ end Generate_Prim_Op_References;
+
------------------------
-- Generate_Reference --
------------------------
Def : Source_Ptr;
Ent : Entity_Id;
+ Call : Node_Id;
+ Formal : Entity_Id;
+ -- Used for call to Find_Actual
+
+ Kind : Entity_Kind;
+ -- If Formal is non-Empty, then its Ekind, otherwise E_Void
+
function Is_On_LHS (Node : Node_Id) return Boolean;
-- Used to check if a node is on the left hand side of an assignment.
-- The following cases are handled:
--
- -- Variable Node is a direct descendant of an assignment statement.
+ -- Variable Node is a direct descendant of left hand side of an
+ -- assignment statement.
+ --
+ -- Prefix Of an indexed or selected component that is present in
+ -- a subtree rooted by an assignment statement. There is
+ -- no restriction of nesting of components, thus cases
+ -- such as A.B (C).D are handled properly. However a prefix
+ -- of a dereference (either implicit or explicit) is never
+ -- considered as on a LHS.
--
- -- Prefix Of an indexed or selected component that is present in a
- -- subtree rooted by an assignment statement. There is no
- -- restriction of nesting of components, thus cases such as
- -- A.B(C).D are handled properly.
+ -- Out param Same as above cases, but OUT parameter
+
+ function OK_To_Set_Referenced return Boolean;
+ -- Returns True if the Referenced flag can be set. There are a few
+ -- exceptions where we do not want to set this flag, see body for
+ -- details of these exceptional cases.
---------------
-- Is_On_LHS --
---------------
- -- Couldn't we use Is_Lvalue or whatever it is called ???
+ -- ??? There are several routines here and there that perform a similar
+ -- (but subtly different) computation, which should be factored:
+
+ -- Sem_Util.May_Be_Lvalue
+ -- Sem_Util.Known_To_Be_Assigned
+ -- Exp_Ch2.Expand_Entry_Parameter.In_Assignment_Context
+ -- Exp_Smem.Is_Out_Actual
function Is_On_LHS (Node : Node_Id) return Boolean is
- N : Node_Id := Node;
+ N : Node_Id;
+ P : Node_Id;
+ K : Node_Kind;
begin
-- Only identifiers are considered, is this necessary???
- if Nkind (N) /= N_Identifier then
+ if Nkind (Node) /= N_Identifier then
return False;
end if;
- -- Reach the assignment statement subtree root. In the case of a
- -- variable being a direct descendant of an assignment statement,
- -- the loop is skiped.
+ -- Immediate return if appeared as OUT parameter
- while Nkind (Parent (N)) /= N_Assignment_Statement loop
+ if Kind = E_Out_Parameter then
+ return True;
+ end if;
- -- Check whether the parent is a component and the
- -- current node is its prefix.
+ -- Search for assignment statement subtree root
- if (Nkind (Parent (N)) = N_Selected_Component
- or else
- Nkind (Parent (N)) = N_Indexed_Component)
- and then Prefix (Parent (N)) = N
+ N := Node;
+ loop
+ P := Parent (N);
+ K := Nkind (P);
+
+ if K = N_Assignment_Statement then
+ return Name (P) = N;
+
+ -- Check whether the parent is a component and the current node is
+ -- its prefix, but return False if the current node has an access
+ -- type, as in that case the selected or indexed component is an
+ -- implicit dereference, and the LHS is the designated object, not
+ -- the access object.
+
+ -- ??? case of a slice assignment?
+
+ -- ??? Note that in some cases this is called too early
+ -- (see comments in Sem_Ch8.Find_Direct_Name), at a point where
+ -- the tree is not fully typed yet. In that case we may lack
+ -- an Etype for N, and we must disable the check for an implicit
+ -- dereference. If the dereference is on an LHS, this causes a
+ -- false positive.
+
+ elsif (K = N_Selected_Component or else K = N_Indexed_Component)
+ and then Prefix (P) = N
+ and then not (Present (Etype (N))
+ and then
+ Is_Access_Type (Etype (N)))
then
- N := Parent (N);
+ N := P;
+
+ -- All other cases, definitely not on left side
+
else
return False;
end if;
end loop;
+ end Is_On_LHS;
- -- Parent (N) is assignment statement, check whether N is its name
+ ---------------------------
+ -- OK_To_Set_Referenced --
+ ---------------------------
- return Name (Parent (N)) = N;
- end Is_On_LHS;
+ function OK_To_Set_Referenced return Boolean is
+ P : Node_Id;
+
+ begin
+ -- A reference from a pragma Unreferenced or pragma Unmodified or
+ -- pragma Warnings does not cause the Referenced flag to be set.
+ -- This avoids silly warnings about things being referenced and
+ -- not assigned when the only reference is from the pragma.
+
+ if Nkind (N) = N_Identifier then
+ P := Parent (N);
+
+ if Nkind (P) = N_Pragma_Argument_Association then
+ P := Parent (P);
+
+ if Nkind (P) = N_Pragma then
+ if Pragma_Name (P) = Name_Warnings
+ or else
+ Pragma_Name (P) = Name_Unmodified
+ or else
+ Pragma_Name (P) = Name_Unreferenced
+ then
+ return False;
+ end if;
+ end if;
+ end if;
+ end if;
+
+ return True;
+ end OK_To_Set_Referenced;
-- Start of processing for Generate_Reference
begin
pragma Assert (Nkind (E) in N_Entity);
+ Find_Actual (N, Formal, Call);
+
+ if Present (Formal) then
+ Kind := Ekind (Formal);
+ else
+ Kind := E_Void;
+ end if;
-- Check for obsolescent reference to package ASCII. GNAT treats this
-- element of annex J specially since in practice, programs make a lot
end if;
-- Unless the reference is forced, we ignore references where the
- -- reference itself does not come from Source.
+ -- reference itself does not come from source.
if not Force and then not Comes_From_Source (N) then
return;
if Set_Ref then
- -- For a variable that appears on the left side of an assignment
- -- statement, we set the Referenced_As_LHS flag since this is indeed
- -- a left hand side. We also set the Referenced_As_LHS flag of a
- -- prefix of selected or indexed component.
+ -- Assignable object appearing on left side of assignment or as
+ -- an out parameter.
- if Ekind (E) = E_Variable
+ if Is_Assignable (E)
and then Is_On_LHS (N)
+ and then Ekind (E) /= E_In_Out_Parameter
then
- Set_Referenced_As_LHS (E);
+ -- For objects that are renamings, just set as simply referenced
+ -- we do not try to do assignment type tracking in this case.
+
+ if Present (Renamed_Object (E)) then
+ Set_Referenced (E);
+
+ -- Out parameter case
+
+ elsif Kind = E_Out_Parameter then
+
+ -- If warning mode for all out parameters is set, or this is
+ -- the only warning parameter, then we want to mark this for
+ -- later warning logic by setting Referenced_As_Out_Parameter
+
+ if Warn_On_Modified_As_Out_Parameter (Formal) then
+ Set_Referenced_As_Out_Parameter (E, True);
+ Set_Referenced_As_LHS (E, False);
+
+ -- For OUT parameter not covered by the above cases, we simply
+ -- regard it as a normal reference (in this case we do not
+ -- want any of the warning machinery for out parameters).
+
+ else
+ Set_Referenced (E);
+ end if;
+
+ -- For the left hand of an assignment case, we do nothing here.
+ -- The processing for Analyze_Assignment_Statement will set the
+ -- Referenced_As_LHS flag.
+
+ else
+ null;
+ end if;
-- Check for a reference in a pragma that should not count as a
-- making the variable referenced for warning purposes.
then
null;
- -- Any other occurrence counts as referencing the entity
+ -- All other cases
else
- Set_Referenced (E);
+ -- Special processing for IN OUT parameters, where we have an
+ -- implicit assignment to a simple variable.
- if Ekind (E) = E_Variable then
+ if Kind = E_In_Out_Parameter
+ and then Is_Assignable (E)
+ then
+ -- For sure this counts as a normal read reference
+
+ Set_Referenced (E);
Set_Last_Assignment (E, Empty);
+
+ -- We count it as being referenced as an out parameter if the
+ -- option is set to warn on all out parameters, except that we
+ -- have a special exclusion for an intrinsic subprogram, which
+ -- is most likely an instantiation of Unchecked_Deallocation
+ -- which we do not want to consider as an assignment since it
+ -- generates false positives. We also exclude the case of an
+ -- IN OUT parameter if the name of the procedure is Free,
+ -- since we suspect similar semantics.
+
+ if Warn_On_All_Unread_Out_Parameters
+ and then Is_Entity_Name (Name (Call))
+ and then not Is_Intrinsic_Subprogram (Entity (Name (Call)))
+ and then Chars (Name (Call)) /= Name_Free
+ then
+ Set_Referenced_As_Out_Parameter (E, True);
+ Set_Referenced_As_LHS (E, False);
+ end if;
+
+ -- Don't count a recursive reference within a subprogram as a
+ -- reference (that allows detection of a recursive subprogram
+ -- whose only references are recursive calls as unreferenced).
+
+ elsif Is_Subprogram (E)
+ and then E = Nearest_Dynamic_Scope (Current_Scope)
+ then
+ null;
+
+ -- Any other occurrence counts as referencing the entity
+
+ elsif OK_To_Set_Referenced then
+ Set_Referenced (E);
+
+ -- If variable, this is an OK reference after an assignment
+ -- so we can clear the Last_Assignment indication.
+
+ if Is_Assignable (E) then
+ Set_Last_Assignment (E, Empty);
+ end if;
end if;
end if;
-- Check for pragma Unreferenced given and reference is within
- -- this source unit (occasion for possible warning to be issued)
+ -- this source unit (occasion for possible warning to be issued).
if Has_Pragma_Unreferenced (E)
and then In_Same_Extended_Unit (E, N)
then
-- A reference as a named parameter in a call does not count
- -- as a violation of pragma Unreferenced for this purpose.
+ -- as a violation of pragma Unreferenced for this purpose...
if Nkind (N) = N_Identifier
and then Nkind (Parent (N)) = N_Parameter_Association
then
null;
- -- Neither does a reference to a variable on the left side
+ -- ... Neither does a reference to a variable on the left side
-- of an assignment.
elsif Is_On_LHS (N) then
while Present (BE) loop
if Chars (BE) = Chars (E) then
Error_Msg_NE
- ("?pragma Unreferenced given for&", N, BE);
+ ("?pragma Unreferenced given for&!", N, BE);
exit;
end if;
-- Here we issue the warning, since this is a real reference
else
- Error_Msg_NE ("?pragma Unreferenced given for&", N, E);
+ Error_Msg_NE ("?pragma Unreferenced given for&!", N, E);
end if;
end if;
and then Sloc (E) > No_Location
and then Sloc (N) > No_Location
- -- We ignore references from within an instance
+ -- We ignore references from within an instance, except for default
+ -- subprograms, for which we generate an implicit reference.
- and then Instantiation_Location (Sloc (N)) = No_Location
+ and then
+ (Instantiation_Location (Sloc (N)) = No_Location or else Typ = 'i')
-- Ignore dummy references
if Comes_From_Source (E) then
Ent := E;
- -- Entity does not come from source, but is a derived subprogram
- -- and the derived subprogram comes from source (after one or more
+ -- Entity does not come from source, but is a derived subprogram and
+ -- the derived subprogram comes from source (after one or more
-- derivations) in which case the reference is to parent subprogram.
elsif Is_Overloadable (E)
then
Ent := E;
- -- Record components of discriminated subtypes or derived types
- -- must be treated as references to the original component.
+ -- Record components of discriminated subtypes or derived types must
+ -- be treated as references to the original component.
elsif Ekind (E) = E_Component
and then Comes_From_Source (Original_Record_Component (E))
then
Ent := Original_Record_Component (E);
+ -- If this is an expanded reference to a discriminant, recover the
+ -- original discriminant, which gets the reference.
+
+ elsif Ekind (E) = E_In_Parameter
+ and then Present (Discriminal_Link (E))
+ then
+ Ent := Discriminal_Link (E);
+ Set_Referenced (Ent);
+
-- Ignore reference to any other entity that is not from source
else
Tref : out Entity_Id;
Left : out Character;
Right : out Character);
- -- Given an entity id Ent, determines whether a type reference is
+ -- Given an Entity_Id Ent, determines whether a type reference is
-- required. If so, Tref is set to the entity for the type reference
- -- and Left and Right are set to the left/right brackets to be
- -- output for the reference. If no type reference is required, then
- -- Tref is set to Empty, and Left/Right are set to space.
+ -- and Left and Right are set to the left/right brackets to be output
+ -- for the reference. If no type reference is required, then Tref is
+ -- set to Empty, and Left/Right are set to space.
procedure Output_Import_Export_Info (Ent : Entity_Id);
- -- Ouput language and external name information for an interfaced
+ -- Output language and external name information for an interfaced
-- entity, using the format <language, external_name>,
------------------------
if Tref /= Etype (Tref) then
Tref := First_Subtype (Etype (Tref));
- -- Set brackets for derived type, but don't
- -- override pointer case since the fact that
- -- something is a pointer is more important
+ -- Set brackets for derived type, but don't override
+ -- pointer case since the fact that something is a
+ -- pointer is more important.
if Left /= '(' then
Left := '<';
end if;
-- If non-derived ptr, get directly designated type.
- -- If the type has a full view, all references are
- -- on the partial view, that is seen first.
+ -- If the type has a full view, all references are on the
+ -- partial view, that is seen first.
elsif Is_Access_Type (Tref) then
Tref := Directly_Designated_Type (Tref);
end if;
end if;
- -- For objects, functions, enum literals,
- -- just get type from Etype field.
+ -- For objects, functions, enum literals, just get type from
+ -- Etype field.
elsif Is_Object (Tref)
or else Ekind (Tref) = E_Enumeration_Literal
exit;
end if;
- -- Exit if no type reference, or we are stuck in
- -- some loop trying to find the type reference, or
- -- if the type is standard void type (the latter is
- -- an implementation artifact that should not show
- -- up in the generated cross-references).
+ -- Exit if no type reference, or we are stuck in some loop trying
+ -- to find the type reference, or if the type is standard void
+ -- type (the latter is an implementation artifact that should not
+ -- show up in the generated cross-references).
exit when No (Tref)
or else Tref = Sav
or else Tref = Standard_Void_Type;
- -- If we have a usable type reference, return, otherwise
- -- keep looking for something useful (we are looking for
- -- something that either comes from source or standard)
+ -- If we have a usable type reference, return, otherwise keep
+ -- looking for something useful (we are looking for something
+ -- that either comes from source or standard)
if Sloc (Tref) = Standard_Location
or else Comes_From_Source (Tref)
then
- -- If the reference is a subtype created for a generic
- -- actual, go to actual directly, the inner subtype is
- -- not user visible.
+ -- If the reference is a subtype created for a generic actual,
+ -- go actual directly, the inner subtype is not user visible.
if Nkind (Parent (Tref)) = N_Subtype_Declaration
and then not Comes_From_Source (Parent (Tref))
return;
end if;
+ -- First we add references to the primitive operations of tagged
+ -- types declared in the main unit.
+
+ Handle_Prim_Ops : declare
+ Ent : Entity_Id;
+
+ begin
+ for J in 1 .. Xrefs.Last loop
+ Ent := Xrefs.Table (J).Ent;
+
+ if Is_Type (Ent)
+ and then Is_Tagged_Type (Ent)
+ and then Ent = Base_Type (Ent)
+ and then In_Extended_Main_Source_Unit (Ent)
+ then
+ Generate_Prim_Op_References (Ent);
+ end if;
+ end loop;
+ end Handle_Prim_Ops;
+
-- Before we go ahead and output the references we have a problem
-- that needs dealing with. So far we have captured things that are
-- definitely referenced by the main unit, or defined in the main
Handle_Orphan_Type_References : declare
J : Nat;
Tref : Entity_Id;
- L, R : Character;
Indx : Nat;
Ent : Entity_Id;
Loc : Source_Ptr;
+ L, R : Character;
+ pragma Warnings (Off, L);
+ pragma Warnings (Off, R);
+
procedure New_Entry (E : Entity_Id);
-- Make an additional entry into the Xref table for a type entity
- -- that is related to the current entity (parent, type. ancestor,
+ -- that is related to the current entity (parent, type ancestor,
-- progenitor, etc.).
----------------
begin
-- Note that this is not a for loop for a very good reason. The
-- processing of items in the table can add new items to the table,
- -- and they must be processed as well
+ -- and they must be processed as well.
J := 1;
while J <= Xrefs.Last loop
New_Entry (Tref);
if Is_Record_Type (Ent)
- and then Present (Abstract_Interfaces (Ent))
+ and then Present (Interfaces (Ent))
then
-- Add an entry for each one of the given interfaces
-- implemented by type Ent.
declare
- Elmt : Elmt_Id;
-
+ Elmt : Elmt_Id := First_Elmt (Interfaces (Ent));
begin
- Elmt := First_Elmt (Abstract_Interfaces (Ent));
while Present (Elmt) loop
New_Entry (Node (Elmt));
Next_Elmt (Elmt);
end if;
end if;
- -- Collect inherited primitive operations that may be
- -- declared in another unit and have no visible reference
- -- in the current one.
+ -- Collect inherited primitive operations that may be declared in
+ -- another unit and have no visible reference in the current one.
if Is_Type (Ent)
and then Is_Tagged_Type (Ent)
Prim : Entity_Id;
function Parent_Op (E : Entity_Id) return Entity_Id;
- -- Find original operation, which may be inherited
- -- through several derivations.
+ -- Find original operation, which may be inherited through
+ -- several derivations.
function Parent_Op (E : Entity_Id) return Entity_Id is
Orig_Op : constant Entity_Id := Alias (E);
+
begin
if No (Orig_Op) then
return Empty;
+
elsif not Comes_From_Source (E)
and then not Has_Xref_Entry (Orig_Op)
and then Comes_From_Source (Orig_Op)
Output_Refs : declare
Nrefs : Nat := Xrefs.Last;
- -- Number of references in table. This value may get reset
- -- (reduced) when we eliminate duplicate reference entries.
+ -- Number of references in table. This value may get reset (reduced)
+ -- when we eliminate duplicate reference entries.
Rnums : array (0 .. Nrefs) of Nat;
-- This array contains numbers of references in the Xrefs table.
procedure Move (From : Natural; To : Natural);
-- Move procedure for Sort call
+ package Sorting is new GNAT.Heap_Sort_G (Move, Lt);
+
--------
-- Lt --
--------
T2 : Xref_Entry renames Xrefs.Table (Rnums (Nat (Op2)));
begin
- -- First test. If entity is in different unit, sort by unit
+ -- First test: if entity is in different unit, sort by unit
if T1.Eun /= T2.Eun then
return Dependency_Num (T1.Eun) < Dependency_Num (T2.Eun);
- -- Second test, within same unit, sort by entity Sloc
+ -- Second test: within same unit, sort by entity Sloc
elsif T1.Def /= T2.Def then
return T1.Def < T2.Def;
- -- Third test, sort definitions ahead of references
+ -- Third test: sort definitions ahead of references
elsif T1.Loc = No_Location then
return True;
elsif T2.Loc = No_Location then
return False;
- -- Fourth test, for same entity, sort by reference location unit
+ -- Fourth test: for same entity, sort by reference location unit
elsif T1.Lun /= T2.Lun then
return Dependency_Num (T1.Lun) < Dependency_Num (T2.Lun);
- -- Fifth test order of location within referencing unit
+ -- Fifth test: order of location within referencing unit
elsif T1.Loc /= T2.Loc then
return T1.Loc < T2.Loc;
if Name_Len /= Curlen then
return True;
-
else
return Name_Buffer (1 .. Curlen) /= Curnam (1 .. Curlen);
end if;
-- Sort the references
- GNAT.Heap_Sort_A.Sort
- (Integer (Nrefs),
- Move'Unrestricted_Access,
- Lt'Unrestricted_Access);
+ Sorting.Sort (Integer (Nrefs));
-- Eliminate duplicate entries
for Refno in 1 .. Nrefs loop
Output_One_Ref : declare
P2 : Source_Ptr;
+ Ent : Entity_Id;
+
WC : Char_Code;
Err : Boolean;
- Ent : Entity_Id;
+ pragma Warnings (Off, WC);
+ pragma Warnings (Off, Err);
XE : Xref_Entry renames Xrefs.Table (Rnums (Refno));
-- The current entry to be accessed
-- Used for {} or <> or () for type reference
procedure Check_Type_Reference
- (Ent : Entity_Id;
+ (Ent : Entity_Id;
List_Interface : Boolean);
-- Find whether there is a meaningful type reference for
-- Ent, and display it accordingly. If List_Interface is
--------------------------
procedure Check_Type_Reference
- (Ent : Entity_Id;
+ (Ent : Entity_Id;
List_Interface : Boolean)
is
begin
if List_Interface then
- -- This is a progenitor interface of the type for
- -- which xref information is being generated.
+ -- This is a progenitor interface of the type for which
+ -- xref information is being generated.
Tref := Ent;
Left := '<';
(Int (Get_Logical_Line_Number (Sloc (Tref))));
declare
- Ent : Entity_Id := Tref;
- Kind : constant Entity_Kind := Ekind (Ent);
- Ctyp : Character := Xref_Entity_Letters (Kind);
+ Ent : Entity_Id;
+ Ctyp : Character;
begin
+ Ent := Tref;
+ Ctyp := Xref_Entity_Letters (Ekind (Ent));
+
if Ctyp = '+'
and then Present (Full_View (Ent))
then
Write_Info_Nat
(Int (Get_Column_Number (Sloc (Tref))));
- -- If the type comes from an instantiation,
- -- add the corresponding info.
+ -- If the type comes from an instantiation, add the
+ -- corresponding info.
Output_Instantiation_Refs (Sloc (Tref));
Write_Info_Char (Right);
--------------------------
procedure Output_Overridden_Op (Old_E : Entity_Id) is
+ Op : Entity_Id;
+
begin
- if Present (Old_E)
- and then Sloc (Old_E) /= Standard_Location
+ -- The overridden operation has an implicit declaration
+ -- at the point of derivation. What we want to display
+ -- is the original operation, which has the actual body
+ -- (or abstract declaration) that is being overridden.
+ -- The overridden operation is not always set, e.g. when
+ -- it is a predefined operator.
+
+ if No (Old_E) then
+ return;
+
+ -- Follow alias chain if one is present
+
+ elsif Present (Alias (Old_E)) then
+
+ -- The subprogram may have been implicitly inherited
+ -- through several levels of derivation, so find the
+ -- ultimate (source) ancestor.
+
+ Op := Alias (Old_E);
+ while Present (Alias (Op)) loop
+ Op := Alias (Op);
+ end loop;
+
+ -- Normal case of no alias present
+
+ else
+ Op := Old_E;
+ end if;
+
+ if Present (Op)
+ and then Sloc (Op) /= Standard_Location
then
declare
- Loc : constant Source_Ptr := Sloc (Old_E);
+ Loc : constant Source_Ptr := Sloc (Op);
Par_Unit : constant Unit_Number_Type :=
Get_Source_Unit (Loc);
+
begin
Write_Info_Char ('<');
Ctyp := Xref_Entity_Letters (Ekind (Ent));
-- Skip reference if it is the only reference to an entity,
- -- and it is an end-line reference, and the entity is not in
+ -- and it is an END line reference, and the entity is not in
-- the current extended source. This prevents junk entries
- -- consisting only of packages with end lines, where no
+ -- consisting only of packages with END lines, where no
-- entity from the package is actually referenced.
if XE.Typ = 'e'
elsif Is_Generic_Type (Ent) then
- -- If the type of the entity is a generic private type
+ -- If the type of the entity is a generic private type,
-- there is no usable full view, so retain the indication
-- that this is an object.
and then Is_Abstract_Subprogram (XE.Ent)
then
if Ctyp = 'U' then
- Ctyp := 'x'; -- abstract procedure
+ Ctyp := 'x'; -- Abstract procedure
elsif Ctyp = 'V' then
- Ctyp := 'y'; -- abstract function
+ Ctyp := 'y'; -- Abstract function
end if;
elsif Is_Type (XE.Ent)
Ctyp := 'h';
elsif Ctyp = 'R' then
- Ctyp := 'H'; -- abstract type
+ Ctyp := 'H'; -- Abstract type
end if;
end if;
Par : Node_Id;
begin
- if Ekind (Scope (E)) /= E_Generic_Package then
+ -- The Present check here is an error defense
+
+ if Present (Scope (E))
+ and then Ekind (Scope (E)) /= E_Generic_Package
+ then
return False;
end if;
end Write_Level_Info;
-- Output entity name. We use the occurrence from the
- -- actual source program at the definition point
+ -- actual source program at the definition point.
P := Original_Location (Sloc (XE.Ent));
end if;
-- Indicate that the entity is in the unit of the current
- -- xref xection.
+ -- xref section.
Curru := Curxu;
begin
Write_Info_Char ('[');
+
if Curru /= Gen_U then
Write_Info_Nat (Dependency_Num (Gen_U));
Write_Info_Char ('|');
Check_Type_Reference (XE.Ent, False);
+ -- Additional information for types with progenitors
+
if Is_Record_Type (XE.Ent)
- and then Present (Abstract_Interfaces (XE.Ent))
+ and then Present (Interfaces (XE.Ent))
then
declare
- Elmt : Elmt_Id;
-
+ Elmt : Elmt_Id := First_Elmt (Interfaces (XE.Ent));
begin
- Elmt := First_Elmt (Abstract_Interfaces (XE.Ent));
while Present (Elmt) loop
Check_Type_Reference (Node (Elmt), True);
Next_Elmt (Elmt);
end loop;
end;
+
+ -- For array types, list index types as well.
+ -- (This is not C, indices have distinct types).
+
+ elsif Is_Array_Type (XE.Ent) then
+ declare
+ Indx : Node_Id;
+ begin
+ Indx := First_Index (XE.Ent);
+ while Present (Indx) loop
+ Check_Type_Reference
+ (First_Subtype (Etype (Indx)), True);
+ Next_Index (Indx);
+ end loop;
+ end;
end if;
- -- If the entity is an overriding operation, write
- -- info on operation that was overridden.
+ -- If the entity is an overriding operation, write info
+ -- on operation that was overridden.
if Is_Subprogram (XE.Ent)
and then Is_Overriding_Operation (XE.Ent)
Output_Import_Export_Info (XE.Ent);
end if;
- Write_Info_Nat (Int (Get_Column_Number (XE.Loc)));
+ Write_Info_Nat (Int (Get_Column_Number (XE.Loc)));
Output_Instantiation_Refs (Sloc (XE.Ent));
end if;
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