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re PR ada/15608 (Bug box at sem_ch3.adb:8228) 

2005-03-08  Ed Schonberg  <schonberg@adacore.com>
	    Javier Miranda  <miranda@adacore.com>

	PR ada/15608
	* sem_util.adb (Get_Task_Body_Procedure): Type may be the completion
	of a private type, in which case it is underlying_type that denotes
	the proper task. Also modified to use the new entity attribute
	that is directly available in the task type and task subtype entities
	(Build_Actual_Subtype_Of_Component): Handle properly multidimensional
	arrays when other dimensions than the first are constrained by
	discriminants of an enclosing record.
	(Insert_Explicit_Dereference): If the prefix is an indexed component or
	a combination of indexed and selected components, find ultimate entity
	and generate the appropriate reference for it, to suppress spurious
	warnings.
	(Note_Possible_Modification): If an entity name has no entity, return.
	(Is_Variable): A function call never denotes a variable.
	(Requires_Transient_Scope): For record types, recurse only on
	components, not on internal subtypes that may have been generated for
	constrained components.

From-SVN: r96504
This commit is contained in:
Ed Schonberg 2005-03-15 17:12:58 +01:00 committed by Arnaud Charlet
parent 89167cad83
commit 482a63fb77
1 changed files with 61 additions and 29 deletions
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90
gcc/ada/sem_util.adb
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@ -415,9 +415,9 @@ package body Sem_Util is
if Ekind (Deaccessed_T) = E_Array_Subtype then
Id := First_Index (Deaccessed_T);
Indx_Type := Underlying_Type (Etype (Id));
while Present (Id) loop
Indx_Type := Underlying_Type (Etype (Id));
if Denotes_Discriminant (Type_Low_Bound (Indx_Type)) or else
Denotes_Discriminant (Type_High_Bound (Indx_Type))
@ -2697,7 +2697,13 @@ package body Sem_Util is
function Get_Task_Body_Procedure (E : Entity_Id) return Node_Id is
begin
return Task_Body_Procedure (Declaration_Node (Root_Type (E)));
-- Note: A task type may be the completion of a private type with
-- discriminants. when performing elaboration checks on a task
-- declaration, the current view of the type may be the private one,
-- and the procedure that holds the body of the task is held in its
-- underlying type.
return Task_Body_Procedure (Underlying_Type (Root_Type (E)));
end Get_Task_Body_Procedure;
-----------------------
@ -3136,6 +3142,7 @@ package body Sem_Util is
procedure Insert_Explicit_Dereference (N : Node_Id) is
New_Prefix : constant Node_Id := Relocate_Node (N);
Ent : Entity_Id := Empty;
Pref : Node_Id;
I : Interp_Index;
It : Interp;
T : Entity_Id;
@ -3174,8 +3181,26 @@ package body Sem_Util is
if Is_Entity_Name (New_Prefix) then
Ent := Entity (New_Prefix);
elsif Nkind (New_Prefix) = N_Selected_Component then
Ent := Entity (Selector_Name (New_Prefix));
-- For a retrieval of a subcomponent of some composite object,
-- retrieve the ultimate entity if there is one.
elsif Nkind (New_Prefix) = N_Selected_Component
or else Nkind (New_Prefix) = N_Indexed_Component
then
Pref := Prefix (New_Prefix);
while Present (Pref)
and then
(Nkind (Pref) = N_Selected_Component
or else Nkind (Pref) = N_Indexed_Component)
loop
Pref := Prefix (Pref);
end loop;
if Present (Pref) and then Is_Entity_Name (Pref) then
Ent := Entity (Pref);
end if;
end if;
if Present (Ent) then
@ -3532,7 +3557,6 @@ package body Sem_Util is
function Is_Dereferenced (N : Node_Id) return Boolean is
P : constant Node_Id := Parent (N);
begin
return
(Nkind (P) = N_Selected_Component
@ -3916,7 +3940,6 @@ package body Sem_Util is
function Is_Inherited_Operation (E : Entity_Id) return Boolean is
Kind : constant Node_Kind := Nkind (Parent (E));
begin
pragma Assert (Is_Overloadable (E));
return Kind = N_Full_Type_Declaration
@ -4325,8 +4348,7 @@ package body Sem_Util is
D : Entity_Id;
function Comes_From_Limited_Private_Type_Declaration
(E : Entity_Id)
return Boolean;
(E : Entity_Id) return Boolean;
-- Check that the type is declared by a limited type declaration,
-- or else is derived from a Remote_Type ancestor through private
-- extensions.
@ -4335,10 +4357,11 @@ package body Sem_Util is
-- Comes_From_Limited_Private_Type_Declaration --
-------------------------------------------------
function Comes_From_Limited_Private_Type_Declaration (E : in Entity_Id)
return Boolean
function Comes_From_Limited_Private_Type_Declaration
(E : Entity_Id) return Boolean
is
N : constant Node_Id := Declaration_Node (E);
begin
if Nkind (N) = N_Private_Type_Declaration
and then Limited_Present (N)
@ -4415,7 +4438,7 @@ package body Sem_Util is
elsif Nkind (Name (N)) = N_Explicit_Dereference
and then Is_Remote_Access_To_Subprogram_Type
(Etype (Prefix (Name (N))))
(Etype (Prefix (Name (N))))
then
-- The dereference of a RAS is a remote call
@ -4441,13 +4464,11 @@ package body Sem_Util is
----------------------
function Is_Selector_Name (N : Node_Id) return Boolean is
begin
if not Is_List_Member (N) then
declare
P : constant Node_Id := Parent (N);
K : constant Node_Kind := Nkind (P);
begin
return
(K = N_Expanded_Name or else
@ -4461,7 +4482,6 @@ package body Sem_Util is
declare
L : constant List_Id := List_Containing (N);
P : constant Node_Id := Parent (L);
begin
return (Nkind (P) = N_Discriminant_Association
and then Selector_Names (P) = L)
@ -4566,9 +4586,7 @@ package body Sem_Util is
return False;
else
S := Current_Scope;
while Present (S) and then S /= Prot loop
if Ekind (S) = E_Function
and then Scope (S) = Prot
then
@ -4629,6 +4647,11 @@ package body Sem_Util is
then
return Is_Variable_Prefix (Original_Node (Prefix (N)));
-- A function call is never a variable
elsif Nkind (N) = N_Function_Call then
return False;
-- All remaining checks use the original node
elsif Is_Entity_Name (Orig_Node) then
@ -4667,7 +4690,6 @@ package body Sem_Util is
when N_Explicit_Dereference =>
declare
Typ : constant Entity_Id := Etype (Prefix (Orig_Node));
begin
return Is_Access_Type (Typ)
and then not Is_Access_Constant (Root_Type (Typ))
@ -5277,6 +5299,13 @@ package body Sem_Util is
if Is_Entity_Name (Exp) then
Ent := Entity (Exp);
-- If the entity is missing, it is an undeclared identifier,
-- and there is nothing to annotate.
if No (Ent) then
return;
end if;
elsif Nkind (Exp) = N_Explicit_Dereference then
declare
P : constant Node_Id := Prefix (Exp);
@ -5883,7 +5912,9 @@ package body Sem_Util is
begin
Comp := First_Entity (Typ);
while Present (Comp) loop
if Requires_Transient_Scope (Etype (Comp)) then
if Ekind (Comp) = E_Component
and then Requires_Transient_Scope (Etype (Comp))
then
return True;
else
Next_Entity (Comp);
@ -6334,7 +6365,6 @@ package body Sem_Util is
function Statically_Different (E1, E2 : Node_Id) return Boolean is
R1 : constant Node_Id := Get_Referenced_Object (E1);
R2 : constant Node_Id := Get_Referenced_Object (E2);
begin
return Is_Entity_Name (R1)
and then Is_Entity_Name (R2)
@ -6571,10 +6601,13 @@ package body Sem_Util is
Expec_Type : constant Entity_Id := First_Subtype (Expected_Type);
function Has_One_Matching_Field return Boolean;
-- Determines whether Expec_Type is a record type with a single
-- component or discriminant whose type matches the found type or
-- is a one dimensional array whose component type matches the
-- found type.
-- Determines if Expec_Type is a record type with a single component or
-- discriminant whose type matches the found type or is one dimensional
-- array whose component type matches the found type.
----------------------------
-- Has_One_Matching_Field --
----------------------------
function Has_One_Matching_Field return Boolean is
E : Entity_Id;
@ -6592,7 +6625,6 @@ package body Sem_Util is
else
E := First_Entity (Expec_Type);
loop
if No (E) then
return False;
@ -6773,9 +6805,9 @@ package body Sem_Util is
and then Etype (Designated_Type (Expec_Type)) = Etype (Expr)
and then No (Parameter_Associations (Expr))
then
Error_Msg_N
("found function name, possibly missing Access attribute!",
Expr);
Error_Msg_N
("found function name, possibly missing Access attribute!",
Expr);
-- Catch common error: a prefix or infix operator which is not
-- directly visible because the type isn't.
@ -6787,8 +6819,8 @@ package body Sem_Util is
and then not In_Use (Expec_Type)
and then Has_Compatible_Type (Right_Opnd (Expr), Expec_Type)
then
Error_Msg_N (
"operator of the type is not directly visible!", Expr);
Error_Msg_N
("operator of the type is not directly visible!", Expr);
elsif Ekind (Found_Type) = E_Void
and then Present (Parent (Found_Type))