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sem_disp.adb (Check_Controlling_Formals): Anonymous access types used in controlling parameters exclude null because it...

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2005-09-01  Javier Miranda  <miranda@adacore.com>
	    Ed Schonberg  <schonberg@adacore.com>

	* sem_disp.adb (Check_Controlling_Formals): Anonymous access types
	used in controlling parameters exclude null because it is necessary to
	read the tag to dispatch, and null has no tag.
	(Override_Dispatching_Operation): If the previous operation is inherited
	from an interface, it becomes hidden  and does not participate in later
	name resolution.

From-SVN: r103885
This commit is contained in:
Javier Miranda 2005-09-05 10:03:00 +02:00 committed by Arnaud Charlet
parent 725393ea91
commit 9cca32af39
1 changed files with 14 additions and 9 deletions
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23
gcc/ada/sem_disp.adb
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@ -115,6 +115,15 @@ package body Sem_Disp is
if Ctrl_Type = Typ then
Set_Is_Controlling_Formal (Formal);
-- Ada 2005 (AI-231):Anonymous access types used in controlling
-- parameters exclude null because it is necessary to read the
-- tag to dispatch, and null has no tag.
if Ekind (Etype (Formal)) = E_Anonymous_Access_Type then
Set_Can_Never_Be_Null (Etype (Formal));
Set_Is_Known_Non_Null (Etype (Formal));
end if;
-- Check that the parameter's nominal subtype statically
-- matches the first subtype.
@ -784,14 +793,7 @@ package body Sem_Disp is
then
Old_Spec := Corresponding_Spec (Old_Bod);
Set_Has_Completion (Old_Spec, False);
if Exception_Mechanism = Front_End_ZCX_Exceptions then
Set_Has_Subprogram_Descriptor (Old_Spec, False);
Set_Handler_Records (Old_Spec, No_List);
Set_Is_Eliminated (Old_Spec);
end if;
end if;
end if;
end loop;
@ -1212,10 +1214,12 @@ package body Sem_Disp is
return;
end if;
-- Ada 2005 (AI-251): Do not replace subprograms corresponding to
-- Ada 2005 (AI-251): Do not replace subprograms inherited from
-- abstract interfaces. They will be used later to generate the
-- corresponding thunks to initialize the Vtable (see subprogram
-- Freeze_Subprogram)
-- Freeze_Subprogram). The inherited operation itself must also
-- become hidden, to avoid spurious ambiguities; name resolution
-- must pick up only the operation that implements it,
if Is_Interface_Subprogram (Prev_Op) then
Set_DT_Position (Prev_Op, DT_Position (Alias (Prev_Op)));
@ -1224,6 +1228,7 @@ package body Sem_Disp is
Set_Abstract_Interface_Alias (Prev_Op, Alias (Prev_Op));
Set_Alias (Prev_Op, New_Op);
Set_Is_Internal (Prev_Op);
Set_Is_Hidden (Prev_Op);
-- Override predefined primitive operations