> Hmm, sad. As the a check in tree-cfg for truth-expressions about
> having type-precision of 1 would be a good way. What is actual the
> cause for not setting type-precision here?
But we are setting it:
/* In Ada, we use an unsigned 8-bit type for the default boolean type. */
boolean_type_node = make_unsigned_type (8);
TREE_SET_CODE (boolean_type_node, BOOLEAN_TYPE);
See make_unsigned_type:
/* Create and return a type for unsigned integers of PRECISION bits. */
tree
make_unsigned_type (int precision)
{
tree type = make_node (INTEGER_TYPE);
TYPE_PRECISION (type) = precision;
fixup_unsigned_type (type);
return type;
}
The other languages are changing the precision, but in Ada we need a standard
scalar (precision == mode size) in order to support invalid values.
> At least in testcases I didn't found a regression caused by this.
Right, I've just installed the attached testcase, it passes with the unmodified
compiler but fails with your gcc-interface/misc.c change.
2011-05-17 Eric Botcazou <ebotca...@adacore.com>
* gnat.dg/invalid1.adb: New test.
--
Eric Botcazou
-- { dg-do run }
-- { dg-options "-gnatws -gnatVa" }
pragma Initialize_Scalars;
procedure Invalid1 is
X : Boolean;
A : Boolean := False;
procedure Uninit (B : out Boolean) is
begin
if A then
B := True;
raise Program_Error;
end if;
end;
begin
-- first, check that initialize_scalars is enabled
begin
if X then
A := False;
end if;
raise Program_Error;
exception
when Constraint_Error => null;
end;
-- second, check if copyback of an invalid value raises constraint error
begin
Uninit (A);
if A then
-- we expect constraint error in the 'if' above according to gnat ug:
-- ....
-- call. Note that there is no specific option to test `out'
-- parameters, but any reference within the subprogram will be tested
-- in the usual manner, and if an invalid value is copied back, any
-- reference to it will be subject to validity checking.
-- ...
raise Program_Error;
end if;
raise Program_Error;
exception
when Constraint_Error => null;
end;
end;
