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2011-08-02  Gary Dismukes  <dismukes@adacore.com>

	* sem_ch6.adb (Check_Conformance): Revise the check for nonconforming
	null exclusions to test Can_Never_Be_Null on the anonymous access types
	of the formals rather than testing the formals themselves. Exclude this
	check in cases where the Old_Formal is marked as a controlling formal,
	to avoid issuing spurious errors for bodies completing dispatching
	operations (due to the flag not getting set on controlling access
	formals in body specs).
	(Find_Corresponding_Spec): When checking full and subtype conformance of
	subprogram bodies in instances, pass Designated and E in that order, for
	consistency with the expected order of the formals (New_Id followed by
	Old_Id).

2011-08-02  Robert Dewar  <dewar@adacore.com>

	* sem_ch8.adb: Minor reformatting.

From-SVN: r177172
This commit is contained in:
Arnaud Charlet 2011-08-02 17:00:07 +02:00
parent 1138cf593b
commit c7b9d548d3
3 changed files with 37 additions and 12 deletions
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18
gcc/ada/ChangeLog
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@ -1,3 +1,21 @@
2011-08-02 Gary Dismukes <dismukes@adacore.com>
* sem_ch6.adb (Check_Conformance): Revise the check for nonconforming
null exclusions to test Can_Never_Be_Null on the anonymous access types
of the formals rather than testing the formals themselves. Exclude this
check in cases where the Old_Formal is marked as a controlling formal,
to avoid issuing spurious errors for bodies completing dispatching
operations (due to the flag not getting set on controlling access
formals in body specs).
(Find_Corresponding_Spec): When checking full and subtype conformance of
subprogram bodies in instances, pass Designated and E in that order, for
consistency with the expected order of the formals (New_Id followed by
Old_Id).
2011-08-02 Robert Dewar <dewar@adacore.com>
* sem_ch8.adb: Minor reformatting.
2011-08-02 Ed Schonberg <schonberg@adacore.com>
* sem_ch8.adb (Analyze_Subprogram_Renaming): new procedure

19
gcc/ada/sem_ch6.adb
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@ -6,7 +6,7 @@
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2010, Free Software Foundation, Inc. --
-- Copyright (C) 1992-2011, 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- --
@ -4144,14 +4144,21 @@ package body Sem_Ch6 is
-- Ada 2005 (AI-231): In case of anonymous access types check
-- the null-exclusion and access-to-constant attributes must
-- match.
-- match. For null exclusion, we test the types rather than the
-- formals themselves, since the attribute is only set reliably
-- on the formals in the Ada 95 case, and we exclude the case
-- where Old_Formal is marked as controlling, to avoid errors
-- when matching completing bodies with dispatching declarations
-- (access formals in the bodies aren't marked Can_Never_Be_Null).
if Ada_Version >= Ada_2005
and then Ekind (Etype (Old_Formal)) = E_Anonymous_Access_Type
and then Ekind (Etype (New_Formal)) = E_Anonymous_Access_Type
and then
(Can_Never_Be_Null (Old_Formal) /=
Can_Never_Be_Null (New_Formal)
((Can_Never_Be_Null (Etype (Old_Formal)) /=
Can_Never_Be_Null (Etype (New_Formal))
and then
not Is_Controlling_Formal (Old_Formal))
or else
Is_Access_Constant (Etype (Old_Formal)) /=
Is_Access_Constant (Etype (New_Formal)))
@ -6250,11 +6257,11 @@ package body Sem_Ch6 is
if Nkind (N) = N_Subprogram_Body
and then Present (Homonym (E))
and then not Fully_Conformant (E, Designator)
and then not Fully_Conformant (Designator, E)
then
goto Next_Entity;
elsif not Subtype_Conformant (E, Designator) then
elsif not Subtype_Conformant (Designator, E) then
goto Next_Entity;
end if;
end if;

12
gcc/ada/sem_ch8.adb
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@ -1622,15 +1622,15 @@ package body Sem_Ch8 is
-- class-wide operation whose body is a dispatching call. We replace the
-- generated renaming declaration:
--
-- procedure P (X : CT) renames P;
-- 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
-- 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.