===================================================================
@@ -3351,6 +3351,14 @@ package body Checks is
Indx := Next_Index (Indx);
end loop;
+ -- if The index type is a formal type, or derived from
+ -- one, the bounds are not static.
+
+ if Is_Generic_Type (Root_Type (Etype (Indx))) then
+ OK := False;
+ return;
+ end if;
+
Determine_Range
(Type_Low_Bound (Etype (Indx)), OK1, LL, LU,
Assume_Valid);
===================================================================
@@ -5633,10 +5633,10 @@ package body Sem_Attr is
while Present (N) loop
Static := Static and then Is_Static_Subtype (Etype (N));
- -- If however the index type is generic, attributes cannot
- -- be folded.
+ -- If however the index type is generic, or derived from
+ -- one, attributes cannot be folded.
- if Is_Generic_Type (Etype (N))
+ if Is_Generic_Type (Root_Type (Etype (N)))
and then Id /= Attribute_Component_Size
then
return;
@@ -6205,13 +6205,13 @@ package body Sem_Attr is
Ind : Node_Id;
begin
- -- In the case of a generic index type, the bounds may appear static
- -- but the computation is not meaningful in this case, and may
- -- generate a spurious warning.
+ -- If any index type is a formal type, or derived from one, the
+ -- bounds are not static. Treating them as static can produce
+ -- spurious warnings or improper constant folding.
Ind := First_Index (P_Type);
while Present (Ind) loop
- if Is_Generic_Type (Etype (Ind)) then
+ if Is_Generic_Type (Root_Type (Etype (Ind))) then
return;
end if;
The attributes of formal discrete types, and of arrays whose indices are formal types, are not static and cannot be constant-folded. The same is true if an index type is derived from a formal type. The check for types derived from formal types was missing, leading to improper static evaluation.. The following must compile and execute quietly: with G1; procedure Q is type Indx is range 1 .. 10; package Inst is new G1 (Indx); use Inst; Obj : R := ((others => 0), 10); begin if not Is_Full (Obj) then raise Program_Error; end if; end; --- generic type Ix is range <>; package G1 is type Iterator is new Ix; type Arr is array (Iterator) of integer; type R is record Nodes : Arr; Count : Positive; end record; function Is_Full (It : R) return Boolean; end G1; --- package body G1 is function Is_Full (It : R) return Boolean is begin return It.Count = It.Nodes'Length; end Is_Full; end G1; Tested on x86_64-pc-linux-gnu, committed on trunk 2010-06-23 Ed Schonberg <schonberg@adacore.com> * sem_attr.adb (Eval_Attribute): If the prefix is an array, the attribute cannot be constant-folded if an index type is a formal type, or is derived from one. * checks.adb (Determine_Range): ditto.