It is not allowed to rename a component of a composite object to which
pragma Volatile_Full_Access has been applied. The following is compiled
with -gnatj55
1. package RenamVFA is
2. type Int8_t is mod 2**8;
3. type Rec is record
4. A,B,C,D : Int8_t;
5. end record;
6. for Rec'Size use 32;
7. for Rec'Alignment use 4;
8. pragma Volatile_Full_Access (Rec);
9. R : Rec;
10. I1 : Int8_t renames R.A; -- illegal for now
|
>>> cannot rename component of
Volatile_Full_Access object
11. type Arr is array (1 .. 4) of Int8_t;
12. pragma Volatile_Full_Access (Arr);
13. A : Arr;
14. I2 : Int8_t renames A (1); -- illegal for now
|
>>> cannot rename component of
Volatile_Full_Access object
15. end RenamVFA;
Tested on x86_64-pc-linux-gnu, committed on trunk
2015-05-22 Robert Dewar <[email protected]>
* sem_ch8.adb (Analyze_Object_Renaming): Check for renaming
component of an object to which Volatile_Full_Access applies.
Index: sem_ch8.adb
===================================================================
--- sem_ch8.adb (revision 223541)
+++ sem_ch8.adb (working copy)
@@ -912,6 +912,25 @@
("renaming of conversion only allowed for tagged types", Nam);
end if;
+ -- Reject renaming of component of Volatile_Full_Access object
+
+ if Nkind_In (Nam, N_Selected_Component, N_Indexed_Component) then
+ declare
+ P : constant Node_Id := Prefix (Nam);
+ begin
+ if Is_Entity_Name (P) then
+ if Has_Volatile_Full_Access (Entity (P))
+ or else
+ Has_Volatile_Full_Access (Etype (P))
+ then
+ Error_Msg_N
+ ("cannot rename component of Volatile_Full_Access "
+ & "object", Nam);
+ end if;
+ end if;
+ end;
+ end if;
+
Resolve (Nam, T);
-- If the renamed object is a function call of a limited type,
