sem_ch4.adb (Process_Implicit_Dereference_Prefix): New subprogram used to record an implicit dereference as a read operation on...
* sem_ch4.adb (Process_Implicit_Dereference_Prefix): New subprogram used to record an implicit dereference as a read operation on its prefix when operating under -gnatc. Necessary to avoid spurious 'variable assigned but never read' warnings in that mode. (Process_Indexed_Component, Analyze_Selected_Component): When the prefix is a non-overloaded implicit dereference, call the above subprogram to ensure proper recording of references. From-SVN: r91892
This commit is contained in:
parent
07233820c3
commit
6e73e3ab00
|
@ -145,25 +145,25 @@ package body Sem_Ch4 is
|
|||
(L, R : Node_Id;
|
||||
Op_Id : Entity_Id;
|
||||
N : Node_Id);
|
||||
-- For the four varieties of concatenation.
|
||||
-- For the four varieties of concatenation
|
||||
|
||||
procedure Find_Equality_Types
|
||||
(L, R : Node_Id;
|
||||
Op_Id : Entity_Id;
|
||||
N : Node_Id);
|
||||
-- Ditto for equality operators.
|
||||
-- Ditto for equality operators
|
||||
|
||||
procedure Find_Boolean_Types
|
||||
(L, R : Node_Id;
|
||||
Op_Id : Entity_Id;
|
||||
N : Node_Id);
|
||||
-- Ditto for binary logical operations.
|
||||
-- Ditto for binary logical operations
|
||||
|
||||
procedure Find_Negation_Types
|
||||
(R : Node_Id;
|
||||
Op_Id : Entity_Id;
|
||||
N : Node_Id);
|
||||
-- Find consistent interpretation for operand of negation operator.
|
||||
-- Find consistent interpretation for operand of negation operator
|
||||
|
||||
procedure Find_Non_Universal_Interpretations
|
||||
(N : Node_Id;
|
||||
|
@ -181,7 +181,7 @@ package body Sem_Ch4 is
|
|||
(R : Node_Id;
|
||||
Op_Id : Entity_Id;
|
||||
N : Node_Id);
|
||||
-- Unary arithmetic types: plus, minus, abs.
|
||||
-- Unary arithmetic types: plus, minus, abs
|
||||
|
||||
procedure Check_Arithmetic_Pair
|
||||
(T1, T2 : Entity_Id;
|
||||
|
@ -212,6 +212,14 @@ package body Sem_Ch4 is
|
|||
-- for the type is not directly visible. The routine uses this type to emit
|
||||
-- a more informative message.
|
||||
|
||||
procedure Process_Implicit_Dereference_Prefix
|
||||
(E : Entity_Id; P : Node_Id);
|
||||
-- Called when P is the prefix of an implicit dereference, denoting
|
||||
-- an object E. If in semantics only mode (-gnatc), record that P
|
||||
-- is a reference to E. Normally, such a reference is generated only
|
||||
-- when the implicit dereference is expanded into an explicit one.
|
||||
-- E may be empty, in which case this procedure does nothing.
|
||||
|
||||
procedure Remove_Abstract_Operations (N : Node_Id);
|
||||
-- Ada 2005: implementation of AI-310. An abstract non-dispatching
|
||||
-- operation is not a candidate interpretation.
|
||||
|
@ -1235,7 +1243,7 @@ package body Sem_Ch4 is
|
|||
|
||||
End_Interp_List;
|
||||
|
||||
-- Error if no interpretation of the prefix has an access type.
|
||||
-- Error if no interpretation of the prefix has an access type
|
||||
|
||||
if Etype (N) = Any_Type then
|
||||
Error_Msg_N
|
||||
|
@ -1371,7 +1379,7 @@ package body Sem_Ch4 is
|
|||
Exp : Node_Id;
|
||||
Array_Type : Entity_Id;
|
||||
Index : Node_Id;
|
||||
Entry_Family : Entity_Id;
|
||||
Pent : Entity_Id := Empty;
|
||||
|
||||
begin
|
||||
Exp := First (Exprs);
|
||||
|
@ -1382,38 +1390,32 @@ package body Sem_Ch4 is
|
|||
else
|
||||
Array_Type := Etype (P);
|
||||
|
||||
-- Prefix must be appropriate for an array type.
|
||||
-- Dereference the prefix if it is an access type.
|
||||
if Is_Entity_Name (P) then
|
||||
Pent := Entity (P);
|
||||
elsif Nkind (P) = N_Selected_Component
|
||||
and then Is_Entity_Name (Selector_Name (P))
|
||||
then
|
||||
Pent := Entity (Selector_Name (P));
|
||||
end if;
|
||||
|
||||
-- Prefix must be appropriate for an array type, taking into
|
||||
-- account a possible implicit dereference.
|
||||
|
||||
if Is_Access_Type (Array_Type) then
|
||||
Array_Type := Designated_Type (Array_Type);
|
||||
Error_Msg_NW (Warn_On_Dereference, "?implicit dereference", N);
|
||||
Process_Implicit_Dereference_Prefix (Pent, P);
|
||||
end if;
|
||||
|
||||
if Is_Array_Type (Array_Type) then
|
||||
null;
|
||||
|
||||
elsif (Is_Entity_Name (P)
|
||||
and then
|
||||
Ekind (Entity (P)) = E_Entry_Family)
|
||||
or else
|
||||
(Nkind (P) = N_Selected_Component
|
||||
and then
|
||||
Is_Entity_Name (Selector_Name (P))
|
||||
and then
|
||||
Ekind (Entity (Selector_Name (P))) = E_Entry_Family)
|
||||
then
|
||||
if Is_Entity_Name (P) then
|
||||
Entry_Family := Entity (P);
|
||||
else
|
||||
Entry_Family := Entity (Selector_Name (P));
|
||||
end if;
|
||||
|
||||
elsif Present (Pent) and then Ekind (Pent) = E_Entry_Family then
|
||||
Analyze (Exp);
|
||||
Set_Etype (N, Any_Type);
|
||||
|
||||
if not Has_Compatible_Type
|
||||
(Exp, Entry_Index_Type (Entry_Family))
|
||||
(Exp, Entry_Index_Type (Pent))
|
||||
then
|
||||
Error_Msg_N ("invalid index type in entry name", N);
|
||||
|
||||
|
@ -1439,13 +1441,7 @@ package body Sem_Ch4 is
|
|||
|
||||
else
|
||||
if Nkind (Parent (N)) = N_Requeue_Statement
|
||||
and then
|
||||
((Is_Entity_Name (P)
|
||||
and then Ekind (Entity (P)) = E_Entry)
|
||||
or else
|
||||
(Nkind (P) = N_Selected_Component
|
||||
and then Is_Entity_Name (Selector_Name (P))
|
||||
and then Ekind (Entity (Selector_Name (P))) = E_Entry))
|
||||
and then Present (Pent) and then Ekind (Pent) = E_Entry
|
||||
then
|
||||
Error_Msg_N
|
||||
("REQUEUE does not permit parameters", First (Exprs));
|
||||
|
@ -2471,6 +2467,7 @@ package body Sem_Ch4 is
|
|||
Comp : Entity_Id;
|
||||
Entity_List : Entity_Id;
|
||||
Prefix_Type : Entity_Id;
|
||||
Pent : Entity_Id := Empty;
|
||||
Act_Decl : Node_Id;
|
||||
In_Scope : Boolean;
|
||||
Parent_N : Node_Id;
|
||||
|
@ -2522,6 +2519,14 @@ package body Sem_Ch4 is
|
|||
|
||||
else
|
||||
Error_Msg_NW (Warn_On_Dereference, "?implicit dereference", N);
|
||||
if Is_Entity_Name (Name) then
|
||||
Pent := Entity (Name);
|
||||
elsif Nkind (Name) = N_Selected_Component
|
||||
and then Is_Entity_Name (Selector_Name (Name))
|
||||
then
|
||||
Pent := Entity (Selector_Name (Name));
|
||||
end if;
|
||||
Process_Implicit_Dereference_Prefix (Pent, Name);
|
||||
end if;
|
||||
|
||||
Prefix_Type := Designated_Type (Prefix_Type);
|
||||
|
@ -3961,10 +3966,9 @@ package body Sem_Ch4 is
|
|||
|
||||
Find_Non_Universal_Interpretations (N, R, Op_Id, T1);
|
||||
|
||||
-- Case of operator was not visible, Etype still set to Any_Type
|
||||
|
||||
if Etype (N) = Any_Type then
|
||||
|
||||
-- Operator was not visible.
|
||||
|
||||
Found := False;
|
||||
end if;
|
||||
end if;
|
||||
|
@ -4353,6 +4357,27 @@ package body Sem_Ch4 is
|
|||
end if;
|
||||
end Operator_Check;
|
||||
|
||||
-----------------------------------------
|
||||
-- Process_Implicit_Dereference_Prefix --
|
||||
-----------------------------------------
|
||||
|
||||
procedure Process_Implicit_Dereference_Prefix
|
||||
(E : Entity_Id; P : Entity_Id)
|
||||
is
|
||||
Ref : Node_Id;
|
||||
begin
|
||||
if Operating_Mode = Check_Semantics and then Present (E) then
|
||||
-- We create a dummy reference to E to ensure that the reference
|
||||
-- is not considered as part of an assignment (an implicit
|
||||
-- dereference can never assign to its prefix). The Comes_From_Source
|
||||
-- attribute needs to be propagated for accurate warnings.
|
||||
|
||||
Ref := New_Reference_To (E, Sloc (P));
|
||||
Set_Comes_From_Source (Ref, Comes_From_Source (P));
|
||||
Generate_Reference (E, Ref);
|
||||
end if;
|
||||
end Process_Implicit_Dereference_Prefix;
|
||||
|
||||
--------------------------------
|
||||
-- Remove_Abstract_Operations --
|
||||
--------------------------------
|
||||
|
@ -4540,7 +4565,7 @@ package body Sem_Ch4 is
|
|||
|
||||
if No (It.Nam) then
|
||||
|
||||
-- Removal of abstract operation left no viable candidate.
|
||||
-- Removal of abstract operation left no viable candidate
|
||||
|
||||
Set_Etype (N, Any_Type);
|
||||
Error_Msg_Sloc := Sloc (Abstract_Op);
|
||||
|
@ -4886,14 +4911,14 @@ package body Sem_Ch4 is
|
|||
(Call_Node : Node_Id;
|
||||
Node_To_Replace : Node_Id) return Boolean
|
||||
is
|
||||
Dummy : Node_Id;
|
||||
Elmt : Elmt_Id;
|
||||
Prim_Op : Entity_Id;
|
||||
Prim_Op_Ref : Node_Id;
|
||||
Success : Boolean;
|
||||
Dummy : Node_Id;
|
||||
Elmt : Elmt_Id;
|
||||
Prim_Op : Entity_Id;
|
||||
Prim_Op_Ref : Node_Id;
|
||||
Success : Boolean;
|
||||
|
||||
begin
|
||||
-- Look for the subprogram in the list of primitive operations.
|
||||
-- Look for the subprogram in the list of primitive operations
|
||||
|
||||
Elmt := First_Elmt (Primitive_Operations (Obj_Type));
|
||||
while Present (Elmt) loop
|
||||
|
|
Loading…
Reference in New Issue