-- --
-- B o d y --
-- --
--- Copyright (C) 1992-2010, Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2012, 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- --
with Sem_Ch4; use Sem_Ch4;
with Sem_Ch6; use Sem_Ch6;
with Sem_Ch12; use Sem_Ch12;
+with Sem_Ch13; use Sem_Ch13;
+with Sem_Dim; use Sem_Dim;
with Sem_Disp; use Sem_Disp;
with Sem_Dist; use Sem_Dist;
with Sem_Eval; use Sem_Eval;
-- Visibility and Name Resolution --
------------------------------------
- -- This package handles name resolution and the collection of
+ -- This package handles name resolution and the collection of possible
-- interpretations for overloaded names, prior to overload resolution.
-- Name resolution is the process that establishes a mapping between source
-- re-installing use clauses of parent units. N is the use_clause that
-- names P (and possibly other packages).
- procedure Use_One_Type (Id : Node_Id);
+ procedure Use_One_Type (Id : Node_Id; Installed : Boolean := False);
-- Id is the subtype mark from a use type clause. This procedure makes
- -- the primitive operators of the type potentially use-visible.
+ -- the primitive operators of the type potentially use-visible. The
+ -- boolean flag Installed indicates that the clause is being reinstalled
+ -- after previous analysis, and primitive operations are already chained
+ -- on the Used_Operations list of the clause.
procedure Write_Info;
-- Write debugging information on entities declared in current scope
Nam : constant Node_Id := Name (N);
begin
- -- Exception renaming is not allowed in SPARK or ALFA
-
- if Formal_Verification_Mode then
- Error_Msg_F ("|~~exception renaming is not allowed", N);
- end if;
-
- -- Proceed with analysis
+ Check_SPARK_Restriction ("exception renaming is not allowed", N);
Enter_Name (Id);
Analyze (Nam);
Inst : Boolean := False; -- prevent junk warning
begin
- -- Generic renaming is not allowed in SPARK or ALFA
-
- if Formal_Verification_Mode then
- Error_Msg_F ("|~~generic renaming is not allowed", N);
- end if;
-
- -- Proceed with analysis
-
if Name (N) = Error then
return;
end if;
+ Check_SPARK_Restriction ("generic renaming is not allowed", N);
+
Generate_Definition (New_P);
if Current_Scope /= Standard_Standard then
-----------------------------
procedure Analyze_Object_Renaming (N : Node_Id) is
- Id : constant Entity_Id := Defining_Identifier (N);
+ Loc : constant Source_Ptr := Sloc (N);
+ Id : constant Entity_Id := Defining_Identifier (N);
Dec : Node_Id;
- Nam : constant Node_Id := Name (N);
+ Nam : constant Node_Id := Name (N);
T : Entity_Id;
T2 : Entity_Id;
+ procedure Check_Constrained_Object;
+ -- If the nominal type is unconstrained but the renamed object is
+ -- constrained, as can happen with renaming an explicit dereference or
+ -- a function return, build a constrained subtype from the object. If
+ -- the renaming is for a formal in an accept statement, the analysis
+ -- has already established its actual subtype. This is only relevant
+ -- if the renamed object is an explicit dereference.
+
function In_Generic_Scope (E : Entity_Id) return Boolean;
-- Determine whether entity E is inside a generic cope
+ ------------------------------
+ -- Check_Constrained_Object --
+ ------------------------------
+
+ procedure Check_Constrained_Object is
+ Subt : Entity_Id;
+
+ begin
+ if Nkind_In (Nam, N_Function_Call, N_Explicit_Dereference)
+ and then Is_Composite_Type (Etype (Nam))
+ and then not Is_Constrained (Etype (Nam))
+ and then not Has_Unknown_Discriminants (Etype (Nam))
+ and then Expander_Active
+ then
+ -- If Actual_Subtype is already set, nothing to do
+
+ if Ekind_In (Id, E_Variable, E_Constant)
+ and then Present (Actual_Subtype (Id))
+ then
+ null;
+
+ -- A renaming of an unchecked union does not have an
+ -- actual subtype.
+
+ elsif Is_Unchecked_Union (Etype (Nam)) then
+ null;
+
+ else
+ Subt := Make_Temporary (Loc, 'T');
+ Remove_Side_Effects (Nam);
+ Insert_Action (N,
+ Make_Subtype_Declaration (Loc,
+ Defining_Identifier => Subt,
+ Subtype_Indication =>
+ Make_Subtype_From_Expr (Nam, Etype (Nam))));
+ Rewrite (Subtype_Mark (N), New_Occurrence_Of (Subt, Loc));
+ Set_Etype (Nam, Subt);
+ end if;
+ end if;
+ end Check_Constrained_Object;
+
----------------------
-- In_Generic_Scope --
----------------------
-- Start of processing for Analyze_Object_Renaming
begin
- -- Object renaming is not allowed in SPARK or ALFA
-
- if Formal_Verification_Mode then
- Error_Msg_F ("|~~object renaming is not allowed", N);
- end if;
-
- -- Proceed with analysis
-
if Nam = Error then
return;
end if;
+ Check_SPARK_Restriction ("object renaming is not allowed", N);
+
Set_Is_Pure (Id, Is_Pure (Current_Scope));
Enter_Name (Id);
T := Entity (Subtype_Mark (N));
Analyze (Nam);
+ -- Reject renamings of conversions unless the type is tagged, or
+ -- the conversion is implicit (which can occur for cases of anonymous
+ -- access types in Ada 2012).
+
if Nkind (Nam) = N_Type_Conversion
- and then not Is_Tagged_Type (T)
+ and then Comes_From_Source (Nam)
+ and then not Is_Tagged_Type (T)
then
Error_Msg_N
("renaming of conversion only allowed for tagged types", Nam);
Resolve (Nam, T);
+ -- If the renamed object is a function call of a limited type,
+ -- the expansion of the renaming is complicated by the presence
+ -- of various temporaries and subtypes that capture constraints
+ -- of the renamed object. Rewrite node as an object declaration,
+ -- whose expansion is simpler. Given that the object is limited
+ -- there is no copy involved and no performance hit.
+
+ if Nkind (Nam) = N_Function_Call
+ and then Is_Immutably_Limited_Type (Etype (Nam))
+ and then not Is_Constrained (Etype (Nam))
+ and then Comes_From_Source (N)
+ then
+ Set_Etype (Id, T);
+ Set_Ekind (Id, E_Constant);
+ Rewrite (N,
+ Make_Object_Declaration (Loc,
+ Defining_Identifier => Id,
+ Constant_Present => True,
+ Object_Definition => New_Occurrence_Of (Etype (Nam), Loc),
+ Expression => Relocate_Node (Nam)));
+ return;
+ end if;
+
+ -- Ada 2012 (AI05-149): Reject renaming of an anonymous access object
+ -- when renaming declaration has a named access type. The Ada 2012
+ -- coverage rules allow an anonymous access type in the context of
+ -- an expected named general access type, but the renaming rules
+ -- require the types to be the same. (An exception is when the type
+ -- of the renaming is also an anonymous access type, which can only
+ -- happen due to a renaming created by the expander.)
+
+ if Nkind (Nam) = N_Type_Conversion
+ and then not Comes_From_Source (Nam)
+ and then Ekind (Etype (Expression (Nam))) = E_Anonymous_Access_Type
+ and then Ekind (T) /= E_Anonymous_Access_Type
+ then
+ Wrong_Type (Expression (Nam), T); -- Should we give better error???
+ end if;
+
-- Check that a class-wide object is not being renamed as an object
-- of a specific type. The test for access types is needed to exclude
-- cases where the renamed object is a dynamically tagged access
-- Ada 2005 AI05-105: if the declaration has an anonymous access
-- type, the renamed object must also have an anonymous type, and
- -- this is a name resolution rule. This was implicit in the last
- -- part of the first sentence in 8.5.1.(3/2), and is made explicit
- -- by this recent AI.
+ -- this is a name resolution rule. This was implicit in the last part
+ -- of the first sentence in 8.5.1(3/2), and is made explicit by this
+ -- recent AI.
if not Is_Overloaded (Nam) then
if Ekind (Etype (Nam)) /= Ekind (T) then
(Designated_Type (T), Designated_Type (Etype (Nam)));
elsif not Subtypes_Statically_Match
- (Designated_Type (T), Designated_Type (Etype (Nam)))
+ (Designated_Type (T),
+ Available_View (Designated_Type (Etype (Nam))))
then
Error_Msg_N
("subtype of renamed object does not statically match", N);
Nam);
end if;
- -- If the function call returns an unconstrained type, we must
- -- build a constrained subtype for the new entity, in a way
- -- similar to what is done for an object declaration with an
- -- unconstrained nominal type.
-
- if Is_Composite_Type (Etype (Nam))
- and then not Is_Constrained (Etype (Nam))
- and then not Has_Unknown_Discriminants (Etype (Nam))
- and then Expander_Active
- then
- declare
- Loc : constant Source_Ptr := Sloc (N);
- Subt : constant Entity_Id := Make_Temporary (Loc, 'T');
- begin
- Remove_Side_Effects (Nam);
- Insert_Action (N,
- Make_Subtype_Declaration (Loc,
- Defining_Identifier => Subt,
- Subtype_Indication =>
- Make_Subtype_From_Expr (Nam, Etype (Nam))));
- Rewrite (Subtype_Mark (N), New_Occurrence_Of (Subt, Loc));
- Set_Etype (Nam, Subt);
- end;
- end if;
end case;
end if;
+ Check_Constrained_Object;
+
-- An object renaming requires an exact match of the type. Class-wide
-- matching is not allowed.
T2 := Etype (Nam);
- -- (Ada 2005: AI-326): Handle wrong use of incomplete type
+ -- Ada 2005 (AI-326): Handle wrong use of incomplete type
if Nkind (Nam) = N_Explicit_Dereference
and then Ekind (Etype (T2)) = E_Incomplete_Type
end if;
Set_Ekind (Id, E_Variable);
- Init_Size_Align (Id);
+
+ -- Initialize the object size and alignment. Note that we used to call
+ -- Init_Size_Align here, but that's wrong for objects which have only
+ -- an Esize, not an RM_Size field!
+
+ Init_Object_Size_Align (Id);
if T = Any_Type or else Etype (Nam) = Any_Type then
return;
end if;
Set_Renamed_Object (Id, Nam);
+ Analyze_Dimension (N);
end Analyze_Object_Renaming;
------------------------------
---------------------------------
procedure Analyze_Subprogram_Renaming (N : Node_Id) is
- Formal_Spec : constant Node_Id := Corresponding_Formal_Spec (N);
- Is_Actual : constant Boolean := Present (Formal_Spec);
+ Formal_Spec : constant Node_Id := Corresponding_Formal_Spec (N);
+ Is_Actual : constant Boolean := Present (Formal_Spec);
Inst_Node : Node_Id := Empty;
Nam : constant Node_Id := Name (N);
New_S : Entity_Id;
-- before the subprogram it completes is frozen, and renaming indirectly
-- renames the subprogram itself.(Defect Report 8652/0027).
+ function Check_Class_Wide_Actual return Entity_Id;
+ -- AI05-0071: In an instance, if the actual for a formal type FT with
+ -- unknown discriminants is a class-wide type CT, and the generic has
+ -- a formal subprogram with a box for a primitive operation of FT,
+ -- then the corresponding actual subprogram denoted by the default is a
+ -- class-wide operation whose body is a dispatching call. We replace the
+ -- generated renaming declaration:
+ --
+ -- procedure P (X : CT) renames P;
+ --
+ -- by a different renaming and a class-wide operation:
+ --
+ -- procedure Pr (X : T) renames P; -- renames primitive operation
+ -- procedure P (X : CT); -- class-wide operation
+ -- ...
+ -- procedure P (X : CT) is begin Pr (X); end; -- dispatching call
+ --
+ -- This rule only applies if there is no explicit visible class-wide
+ -- operation at the point of the instantiation.
+
+ function Has_Class_Wide_Actual return Boolean;
+ -- Ada 2012 (AI05-071, AI05-0131): True if N is the renaming for a
+ -- defaulted formal subprogram when the actual for the controlling
+ -- formal type is class-wide.
+
+ -----------------------------
+ -- Check_Class_Wide_Actual --
+ -----------------------------
+
+ function Check_Class_Wide_Actual return Entity_Id is
+ Loc : constant Source_Ptr := Sloc (N);
+
+ F : Entity_Id;
+ Formal_Type : Entity_Id;
+ Actual_Type : Entity_Id;
+ New_Body : Node_Id;
+ New_Decl : Node_Id;
+ Result : Entity_Id;
+
+ function Make_Call (Prim_Op : Entity_Id) return Node_Id;
+ -- Build dispatching call for body of class-wide operation
+
+ function Make_Spec return Node_Id;
+ -- Create subprogram specification for declaration and body of
+ -- class-wide operation, using signature of renaming declaration.
+
+ ---------------
+ -- Make_Call --
+ ---------------
+
+ function Make_Call (Prim_Op : Entity_Id) return Node_Id is
+ Actuals : List_Id;
+ F : Node_Id;
+
+ begin
+ Actuals := New_List;
+ F := First (Parameter_Specifications (Specification (New_Decl)));
+ while Present (F) loop
+ Append_To (Actuals,
+ Make_Identifier (Loc, Chars (Defining_Identifier (F))));
+ Next (F);
+ end loop;
+
+ if Ekind_In (Prim_Op, E_Function, E_Operator) then
+ return Make_Simple_Return_Statement (Loc,
+ Expression =>
+ Make_Function_Call (Loc,
+ Name => New_Occurrence_Of (Prim_Op, Loc),
+ Parameter_Associations => Actuals));
+ else
+ return
+ Make_Procedure_Call_Statement (Loc,
+ Name => New_Occurrence_Of (Prim_Op, Loc),
+ Parameter_Associations => Actuals);
+ end if;
+ end Make_Call;
+
+ ---------------
+ -- Make_Spec --
+ ---------------
+
+ function Make_Spec return Node_Id is
+ Param_Specs : constant List_Id := Copy_Parameter_List (New_S);
+
+ begin
+ if Ekind (New_S) = E_Procedure then
+ return
+ Make_Procedure_Specification (Loc,
+ Defining_Unit_Name =>
+ Make_Defining_Identifier (Loc,
+ Chars (Defining_Unit_Name (Spec))),
+ Parameter_Specifications => Param_Specs);
+ else
+ return
+ Make_Function_Specification (Loc,
+ Defining_Unit_Name =>
+ Make_Defining_Identifier (Loc,
+ Chars (Defining_Unit_Name (Spec))),
+ Parameter_Specifications => Param_Specs,
+ Result_Definition =>
+ New_Copy_Tree (Result_Definition (Spec)));
+ end if;
+ end Make_Spec;
+
+ -- Start of processing for Check_Class_Wide_Actual
+
+ begin
+ Result := Any_Id;
+ Formal_Type := Empty;
+ Actual_Type := Empty;
+
+ F := First_Formal (Formal_Spec);
+ while Present (F) loop
+ if Has_Unknown_Discriminants (Etype (F))
+ and then not Is_Class_Wide_Type (Etype (F))
+ and then Is_Class_Wide_Type (Get_Instance_Of (Etype (F)))
+ then
+ Formal_Type := Etype (F);
+ Actual_Type := Etype (Get_Instance_Of (Formal_Type));
+ exit;
+ end if;
+
+ Next_Formal (F);
+ end loop;
+
+ if Present (Formal_Type) then
+
+ -- Create declaration and body for class-wide operation
+
+ New_Decl :=
+ Make_Subprogram_Declaration (Loc, Specification => Make_Spec);
+
+ New_Body :=
+ Make_Subprogram_Body (Loc,
+ Specification => Make_Spec,
+ Declarations => No_List,
+ Handled_Statement_Sequence =>
+ Make_Handled_Sequence_Of_Statements (Loc, New_List));
+
+ -- Modify Spec and create internal name for renaming of primitive
+ -- operation.
+
+ Set_Defining_Unit_Name (Spec, Make_Temporary (Loc, 'R'));
+ F := First (Parameter_Specifications (Spec));
+ while Present (F) loop
+ if Nkind (Parameter_Type (F)) = N_Identifier
+ and then Is_Class_Wide_Type (Entity (Parameter_Type (F)))
+ then
+ Set_Parameter_Type (F, New_Occurrence_Of (Actual_Type, Loc));
+ end if;
+ Next (F);
+ end loop;
+
+ New_S := Analyze_Subprogram_Specification (Spec);
+ Result := Find_Renamed_Entity (N, Name (N), New_S, Is_Actual);
+ end if;
+
+ if Result /= Any_Id then
+ Insert_Before (N, New_Decl);
+ Analyze (New_Decl);
+
+ -- Add dispatching call to body of class-wide operation
+
+ Append (Make_Call (Result),
+ Statements (Handled_Statement_Sequence (New_Body)));
+
+ -- The generated body does not freeze. It is analyzed when the
+ -- generated operation is frozen. This body is only needed if
+ -- expansion is enabled.
+
+ if Expander_Active then
+ Append_Freeze_Action (Defining_Entity (New_Decl), New_Body);
+ end if;
+
+ Result := Defining_Entity (New_Decl);
+ end if;
+
+ -- Return the class-wide operation if one was created
+
+ return Result;
+ end Check_Class_Wide_Actual;
+
--------------------------
-- Check_Null_Exclusion --
--------------------------
end if;
end Check_Null_Exclusion;
+ ---------------------------
+ -- Has_Class_Wide_Actual --
+ ---------------------------
+
+ function Has_Class_Wide_Actual return Boolean is
+ F_Nam : Entity_Id;
+ F_Spec : Entity_Id;
+
+ begin
+ if Is_Actual
+ and then Nkind (Nam) in N_Has_Entity
+ and then Present (Entity (Nam))
+ and then Is_Dispatching_Operation (Entity (Nam))
+ then
+ F_Nam := First_Entity (Entity (Nam));
+ F_Spec := First_Formal (Formal_Spec);
+ while Present (F_Nam)
+ and then Present (F_Spec)
+ loop
+ if Is_Controlling_Formal (F_Nam)
+ and then Has_Unknown_Discriminants (Etype (F_Spec))
+ and then not Is_Class_Wide_Type (Etype (F_Spec))
+ and then Is_Class_Wide_Type (Get_Instance_Of (Etype (F_Spec)))
+ then
+ return True;
+ end if;
+
+ Next_Entity (F_Nam);
+ Next_Formal (F_Spec);
+ end loop;
+ end if;
+
+ return False;
+ end Has_Class_Wide_Actual;
+
-------------------------
-- Original_Subprogram --
-------------------------
end if;
end Original_Subprogram;
+ CW_Actual : constant Boolean := Has_Class_Wide_Actual;
+ -- Ada 2012 (AI05-071, AI05-0131): True if the renaming is for a
+ -- defaulted formal subprogram when the actual for a related formal
+ -- type is class-wide.
+
-- Start of processing for Analyze_Subprogram_Renaming
begin
-- expanded in subsequent instantiations.
if Is_Actual and then Is_Abstract_Subprogram (Formal_Spec)
- and then Expander_Active
+ and then Full_Expander_Active
then
declare
Stream_Prim : Entity_Id;
if Is_Actual then
Inst_Node := Unit_Declaration_Node (Formal_Spec);
- if Is_Entity_Name (Nam)
+ -- Check whether the renaming is for a defaulted actual subprogram
+ -- with a class-wide actual.
+
+ if CW_Actual then
+ New_S := Analyze_Subprogram_Specification (Spec);
+ Old_S := Check_Class_Wide_Actual;
+
+ elsif Is_Entity_Name (Nam)
and then Present (Entity (Nam))
and then not Comes_From_Source (Nam)
and then not Is_Overloaded (Nam)
elsif not Is_Entity_Name (Nam)
or else not Is_Overloadable (Entity (Nam))
then
- Error_Msg_N ("expect valid subprogram name in renaming", N);
+ -- Do not mention the renaming if it comes from an instance
+
+ if not Is_Actual then
+ Error_Msg_N ("expect valid subprogram name in renaming", N);
+ else
+ Error_Msg_NE ("no visible subprogram for formal&", N, Nam);
+ end if;
+
return;
end if;
-- of a generic, its entity is set to the first available homonym.
-- We must first disambiguate the name, then set the proper entity.
- if Is_Actual
- and then Is_Overloaded (Nam)
- then
+ if Is_Actual and then Is_Overloaded (Nam) then
Set_Entity (Nam, Old_S);
end if;
end if;
end if;
if Old_S /= Any_Id then
- if Is_Actual
- and then From_Default (N)
- then
+ if Is_Actual and then From_Default (N) then
+
-- This is an implicit reference to the default actual
Generate_Reference (Old_S, Nam, Typ => 'i', Force => True);
+
else
Generate_Reference (Old_S, Nam);
end if;
end if;
elsif Ekind (Old_S) /= E_Operator then
- Check_Mode_Conformant (New_S, Old_S);
+
+ -- If this a defaulted subprogram for a class-wide actual there is
+ -- no check for mode conformance, given that the signatures don't
+ -- match (the source mentions T but the actual mentions T'Class).
+
+ if CW_Actual then
+ null;
+ else
+ Check_Mode_Conformant (New_S, Old_S);
+ end if;
if Is_Actual
and then Error_Posted (New_S)
if not Is_Actual
and then (Old_S = New_S
- or else (Nkind (Nam) /= N_Expanded_Name
- and then Chars (Old_S) = Chars (New_S)))
+ or else
+ (Nkind (Nam) /= N_Expanded_Name
+ and then Chars (Old_S) = Chars (New_S))
+ or else
+ (Nkind (Nam) = N_Expanded_Name
+ and then Entity (Prefix (Nam)) = Current_Scope
+ and then
+ Chars (Selector_Name (Nam)) = Chars (New_S)))
then
Error_Msg_N ("subprogram cannot rename itself", N);
end if;
("?redundant renaming, entity is directly visible", Name (N));
end if;
+ -- Implementation-defined aspect specifications can appear in a renaming
+ -- declaration, but not language-defined ones. The call to procedure
+ -- Analyze_Aspect_Specifications will take care of this error check.
+
+ if Has_Aspects (N) then
+ Analyze_Aspect_Specifications (N, New_S);
+ end if;
+
Ada_Version := Save_AV;
Ada_Version_Explicit := Save_AV_Exp;
end Analyze_Subprogram_Renaming;
-- Start of processing for Analyze_Use_Package
begin
- -- Use package is not allowed in SPARK or ALFA
-
- if Formal_Verification_Mode then
- Error_Msg_F ("|~~use clause is not allowed", N);
- return;
- end if;
-
- -- Proceed with analysis
+ Check_SPARK_Restriction ("use clause is not allowed", N);
Set_Hidden_By_Use_Clause (N, No_Elist);
- -- Use clause is not allowed in a spec of a predefined package
- -- declaration except that packages whose file name starts a-n are OK
- -- (these are children of Ada.Numerics, and such packages are never
- -- loaded by Rtsfind).
+ -- Use clause not allowed in a spec of a predefined package declaration
+ -- except that packages whose file name starts a-n are OK (these are
+ -- children of Ada.Numerics, which are never loaded by Rtsfind).
if Is_Predefined_File_Name (Unit_File_Name (Current_Sem_Unit))
and then Name_Buffer (1 .. 3) /= "a-n"
Chain_Use_Clause (N);
end if;
- -- Commented needed???
+ -- If the Used_Operations list is already initialized, the clause has
+ -- been analyzed previously, and it is begin reinstalled, for example
+ -- when the clause appears in a package spec and we are compiling the
+ -- corresponding package body. In that case, make the entities on the
+ -- existing list use_visible, and mark the corresponding types In_Use.
- if Used_Operations (N) /= No_Elist then
+ if Present (Used_Operations (N)) then
declare
+ Mark : Node_Id;
Elmt : Elmt_Id;
+
begin
+ Mark := First (Subtype_Marks (N));
+ while Present (Mark) loop
+ Use_One_Type (Mark, Installed => True);
+ Next (Mark);
+ end loop;
+
Elmt := First_Elmt (Used_Operations (N));
while Present (Elmt) loop
Set_Is_Potentially_Use_Visible (Node (Elmt));
return;
end if;
+ -- Otherwise, create new list and attach to it the operations that
+ -- are made use-visible by the clause.
+
Set_Used_Operations (N, New_Elmt_List);
Id := First (Subtype_Marks (N));
while Present (Id) loop
-- type is still not frozen). We exclude from this processing generic
-- formal subprograms found in instantiations and AST_Entry renamings.
- -- We must exclude VM targets because entity AST_Handler is defined in
- -- package System.Aux_Dec which is not available in those platforms.
+ -- We must exclude VM targets and restricted run-time libraries because
+ -- entity AST_Handler is defined in package System.Aux_Dec which is not
+ -- available in those platforms. Note that we cannot use the function
+ -- Restricted_Profile (instead of Configurable_Run_Time_Mode) because
+ -- the ZFP run-time library is not defined as a profile, and we do not
+ -- want to deal with AST_Handler in ZFP mode.
if VM_Target = No_VM
+ and then not Configurable_Run_Time_Mode
and then not Present (Corresponding_Formal_Spec (N))
and then Etype (Nam) /= RTE (RE_AST_Handler)
then
(Op : Entity_Id;
F : Entity_Id) return Boolean
is
- T : constant Entity_Id := Etype (F);
+ T : constant Entity_Id := Base_Type (Etype (F));
begin
- return (In_Use (T)
- or else Present (Current_Use_Clause (Base_Type (T))))
- and then Scope (T) = Scope (Op);
+ return In_Use (T) and then Scope (T) = Scope (Op);
end Is_Primitive_Operator_In_Use;
-- Start of processing for End_Use_Package
end if;
Set_Entity_Or_Discriminal (N, E);
+
+ if Ada_Version >= Ada_2012
+ and then
+ (Nkind (Parent (N)) in N_Subexpr
+ or else Nkind (Parent (N)) = N_Object_Declaration)
+ then
+ Check_Implicit_Dereference (N, Etype (E));
+ end if;
end if;
end;
end Find_Direct_Name;
Next_Entity (Id);
end loop;
- -- If not found, standard error message.
+ -- If not found, standard error message
Error_Msg_NE ("& not declared in&", N, Selector);
return Old_S;
end Report_Overload;
- -- Start of processing for Find_Renamed_Entry
+ -- Start of processing for Find_Renamed_Entity
begin
Old_S := Any_Id;
if Present (Inst) then
if Within (It.Nam, Inst) then
- return (It.Nam);
+ if Within (Old_S, Inst) then
+
+ -- Choose the innermost subprogram, which would
+ -- have hidden the outer one in the generic.
+
+ if Scope_Depth (It.Nam) <
+ Scope_Depth (Old_S)
+ then
+ return Old_S;
+ else
+ return It.Nam;
+ end if;
+ end if;
+
elsif Within (Old_S, Inst) then
return (Old_S);
+
else
return Report_Overload;
end if;
+ -- If not within an instance, ambiguity is real
+
else
return Report_Overload;
end if;
end loop;
Set_Entity (Nam, Old_S);
- Set_Is_Overloaded (Nam, False);
+
+ if Old_S /= Any_Id then
+ Set_Is_Overloaded (Nam, False);
+ end if;
end if;
return Old_S;
if Nkind (P) = N_Error then
return;
+ end if;
+
+ -- Selector name cannot be a character literal or an operator symbol in
+ -- SPARK, except for the operator symbol in a renaming.
+
+ if Restriction_Check_Required (SPARK) then
+ if Nkind (Selector_Name (N)) = N_Character_Literal then
+ Check_SPARK_Restriction
+ ("character literal cannot be prefixed", N);
+ elsif Nkind (Selector_Name (N)) = N_Operator_Symbol
+ and then Nkind (Parent (N)) /= N_Subprogram_Renaming_Declaration
+ then
+ Check_SPARK_Restriction ("operator symbol cannot be prefixed", N);
+ end if;
+ end if;
-- If the selector already has an entity, the node has been constructed
-- in the course of expansion, and is known to be valid. Do not verify
-- that it is defined for the type (it may be a private component used
-- in the expansion of record equality).
- elsif Present (Entity (Selector_Name (N))) then
+ if Present (Entity (Selector_Name (N))) then
if No (Etype (N))
or else Etype (N) = Any_Type
then
then
-- Do not build the subtype when referencing components of
-- dispatch table wrappers. Required to avoid generating
- -- elaboration code with HI runtimes.
-
- if RTU_Loaded (Ada_Tags)
- and then RTE_Available (RE_Dispatch_Table_Wrapper)
- and then Scope (Selector) = RTE (RE_Dispatch_Table_Wrapper)
- then
- C_Etype := Empty;
+ -- elaboration code with HI runtimes. JVM and .NET use a
+ -- modified version of Ada.Tags which does not contain RE_
+ -- Dispatch_Table_Wrapper and RE_No_Dispatch_Table_Wrapper.
+ -- Avoid raising RE_Not_Available exception in those cases.
- elsif RTU_Loaded (Ada_Tags)
- and then RTE_Available (RE_No_Dispatch_Table_Wrapper)
- and then Scope (Selector)
- = RTE (RE_No_Dispatch_Table_Wrapper)
+ if VM_Target = No_VM
+ and then RTU_Loaded (Ada_Tags)
+ and then
+ ((RTE_Available (RE_Dispatch_Table_Wrapper)
+ and then Scope (Selector) =
+ RTE (RE_Dispatch_Table_Wrapper))
+ or else
+ (RTE_Available (RE_No_Dispatch_Table_Wrapper)
+ and then Scope (Selector) =
+ RTE (RE_No_Dispatch_Table_Wrapper)))
then
C_Etype := Empty;
else
C_Etype :=
- Build_Actual_Subtype_Of_Component (
- Etype (Selector), N);
+ Build_Actual_Subtype_Of_Component
+ (Etype (Selector), N);
end if;
else
elsif Is_Entity_Name (P) then
P_Name := Entity (P);
- -- Selector name is restricted in SPARK
-
- if SPARK_Mode then
- if Is_Subprogram (P_Name) then
- Error_Msg_F
- ("|~~prefix of expanded name cannot be a subprogram", P);
- elsif Ekind (P_Name) = E_Loop then
- Error_Msg_F
- ("|~~prefix of expanded name cannot be a loop statement", P);
- end if;
- end if;
-
-- The prefix may denote an enclosing type which is the completion
-- of an incomplete type declaration.
end if;
end if;
+ -- Selector name is restricted in SPARK
+
+ if Nkind (N) = N_Expanded_Name
+ and then Restriction_Check_Required (SPARK)
+ then
+ if Is_Subprogram (P_Name) then
+ Check_SPARK_Restriction
+ ("prefix of expanded name cannot be a subprogram", P);
+ elsif Ekind (P_Name) = E_Loop then
+ Check_SPARK_Restriction
+ ("prefix of expanded name cannot be a loop statement", P);
+ end if;
+ end if;
+
else
-- If prefix is not the name of an entity, it must be an expression,
-- whose type is appropriate for a record. This is determined by
-- is completed in the current scope, and not for a limited
-- view of a type.
- if not Is_Tagged_Type (T)
- and then Ada_Version >= Ada_2005
- then
- if From_With_Type (T) then
+ if Ada_Version >= Ada_2005 then
+
+ -- Test whether the Available_View of a limited type view
+ -- is tagged, since the limited view may not be marked as
+ -- tagged if the type itself has an untagged incomplete
+ -- type view in its package.
+
+ if From_With_Type (T)
+ and then not Is_Tagged_Type (Available_View (T))
+ then
Error_Msg_N
("prefix of Class attribute must be tagged", N);
Set_Etype (N, Any_Type);
-- Base attribute, not allowed in Ada 83
elsif Attribute_Name (N) = Name_Base then
+ Error_Msg_Name_1 := Name_Base;
+ Check_SPARK_Restriction
+ ("attribute% is only allowed as prefix of another attribute", N);
+
if Ada_Version = Ada_83 and then Comes_From_Source (N) then
Error_Msg_N
("(Ada 83) Base attribute not allowed in subtype mark", N);
-- Use_One_Type --
------------------
- procedure Use_One_Type (Id : Node_Id) is
+ procedure Use_One_Type (Id : Node_Id; Installed : Boolean := False) is
Elmt : Elmt_Id;
Is_Known_Used : Boolean;
Op_List : Elist_Id;
end if;
end Use_Class_Wide_Operations;
- -- Start of processing for Use_One_Type;
+ -- Start of processing for Use_One_Type
begin
-- It is the type determined by the subtype mark (8.4(8)) whose
end if;
Set_Current_Use_Clause (T, Parent (Id));
- Op_List := Collect_Primitive_Operations (T);
-- Iterate over primitive operations of the type. If an operation is
-- already use_visible, it is the result of a previous use_clause,
- -- and already appears on the corresponding entity chain.
+ -- and already appears on the corresponding entity chain. If the
+ -- clause is being reinstalled, operations are already use-visible.
- Elmt := First_Elmt (Op_List);
- while Present (Elmt) loop
- if (Nkind (Node (Elmt)) = N_Defining_Operator_Symbol
- or else Chars (Node (Elmt)) in Any_Operator_Name)
- and then not Is_Hidden (Node (Elmt))
- and then not Is_Potentially_Use_Visible (Node (Elmt))
- then
- Set_Is_Potentially_Use_Visible (Node (Elmt));
- Append_Elmt (Node (Elmt), Used_Operations (Parent (Id)));
+ if Installed then
+ null;
- elsif Ada_Version >= Ada_2012
- and then All_Present (Parent (Id))
- and then not Is_Hidden (Node (Elmt))
- and then not Is_Potentially_Use_Visible (Node (Elmt))
- then
- Set_Is_Potentially_Use_Visible (Node (Elmt));
- Append_Elmt (Node (Elmt), Used_Operations (Parent (Id)));
- end if;
+ else
+ Op_List := Collect_Primitive_Operations (T);
+ Elmt := First_Elmt (Op_List);
+ while Present (Elmt) loop
+ if (Nkind (Node (Elmt)) = N_Defining_Operator_Symbol
+ or else Chars (Node (Elmt)) in Any_Operator_Name)
+ and then not Is_Hidden (Node (Elmt))
+ and then not Is_Potentially_Use_Visible (Node (Elmt))
+ then
+ Set_Is_Potentially_Use_Visible (Node (Elmt));
+ Append_Elmt (Node (Elmt), Used_Operations (Parent (Id)));
- Next_Elmt (Elmt);
- end loop;
- end if;
+ elsif Ada_Version >= Ada_2012
+ and then All_Present (Parent (Id))
+ and then not Is_Hidden (Node (Elmt))
+ and then not Is_Potentially_Use_Visible (Node (Elmt))
+ then
+ Set_Is_Potentially_Use_Visible (Node (Elmt));
+ Append_Elmt (Node (Elmt), Used_Operations (Parent (Id)));
+ end if;
- if Ada_Version >= Ada_2012
- and then All_Present (Parent (Id))
- and then Is_Tagged_Type (T)
- then
- Use_Class_Wide_Operations (T);
+ Next_Elmt (Elmt);
+ end loop;
+ end if;
+
+ if Ada_Version >= Ada_2012
+ and then All_Present (Parent (Id))
+ and then Is_Tagged_Type (T)
+ then
+ Use_Class_Wide_Operations (T);
+ end if;
end if;
-- If warning on redundant constructs, check for unnecessary WITH
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