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Re: [Ada, RFC patch] Fortran Interface: Update comment, add some of the Star/Kind type definitions
- From: Arnaud Charlet <charlet at adacore dot com>
- To: Tobias Burnus <burnus at net-b dot de>, Robert Dewar <dewar at adacore dot com>, Ed Schonberg <schonberg at adacore dot com>
- Cc: gcc patches <gcc-patches at gcc dot gnu dot org>
- Date: Tue, 19 Mar 2013 22:51:57 +0100
- Subject: Re: [Ada, RFC patch] Fortran Interface: Update comment, add some of the Star/Kind type definitions
- References: <5148B2AE dot 1030902 at net-b dot de>
> I would like if some of the Ada/GNAT experts could have a look - as
> this is really my first look at Ada code.
Patch looks reasonable to me at first sight, but I'm not a Fortran specialist.
Ed, Robert, could you have a look?
> 2013-03-19 Tobias Burnus <email@example.com>
> * i-fortra.ads: Update comment, add Ada 2012's optional
> Star and Kind data types for enhanced interoperability.
> diff --git a/gcc/ada/i-fortra.ads b/gcc/ada/i-fortra.ads
> index 992eb28..270c819 100644
> --- a/gcc/ada/i-fortra.ads
> +++ b/gcc/ada/i-fortra.ads
> @@ -26,11 +26,11 @@ package Interfaces.Fortran is
> type Logical is new Boolean;
> for Logical'Size use Integer'Size;
> pragma Convention (Fortran, Logical);
> - -- As required by Fortran standard, stand alone logical allocates same
> - -- space as integer (but what about the array case???). The convention
> - -- is important, since in Fortran, Booleans have zero/non-zero semantics
> - -- for False/True, and the pragma Convention (Fortran) activates the
> - -- special handling required in this case.
> + -- As required by Fortran standard, logical allocates same space as
> + -- an integer. The convention is important, since in Fortran, Booleans
> + -- are implemented with zero/non-zero semantics for False/True, and the
> + -- pragma Convention (Fortran) activates the special handling required
> + -- in this case.
> package Single_Precision_Complex_Types is
> new Ada.Numerics.Generic_Complex_Types (Real);
> @@ -50,6 +50,53 @@ package Interfaces.Fortran is
> type Fortran_Character is array (Positive range <>) of
> + -- Additional declarations as permitted by Ada 2012, p.608, paragraph 21.
> + -- Interoperability with Fortran 77's vendor extension using star
> + -- notation and Fortran 90's intrinsic types with kind=n parameter.
> + -- The following assumes that `n' matches the byte size, which
> + -- most Fortran compiler, including GCC's follow.
> + type Integer_Star_1 is new Integer_8;
> + type Integer_Kind_1 is new Integer_8;
> + type Integer_Star_2 is new Integer_16;
> + type Integer_Kind_2 is new Integer_16;
> + type Integer_Star_4 is new Integer_32;
> + type Integer_Kind_4 is new Integer_32;
> + type Integer_Star_8 is new Integer_64;
> + type Integer_Kind_8 is new Integer_64;
> + type Logical_Star_1 is new Boolean;
> + type Logical_Star_2 is new Boolean;
> + type Logical_Star_4 is new Boolean;
> + type Logical_Star_8 is new Boolean;
> + for Logical_Star_1'Size use Integer_8'Size;
> + for Logical_Star_2'Size use Integer_16'Size;
> + for Logical_Star_4'Size use Integer_32'Size;
> + for Logical_Star_8'Size use Integer_64'Size;
> + pragma Convention (Fortran, Logical_Star_1);
> + pragma Convention (Fortran, Logical_Star_2);
> + pragma Convention (Fortran, Logical_Star_4);
> + pragma Convention (Fortran, Logical_Star_8);
> + type Logical_Kind_1 is new Logical_Star_1;
> + type Logical_Kind_2 is new Logical_Star_2;
> + type Logical_Kind_4 is new Logical_Star_4;
> + type Logical_Kind_8 is new Logical_Star_8;
> + type Real_Star_4 is new Float;
> + type Real_Kind_4 is new Float;
> + type Real_Star_8 is new Long_Float;
> + type Real_Kind_8 is new Long_Float;
> + -- In the kind syntax, n is the same as the associated real kind.
> + -- In the star syntax, n is twice as large (real+imaginary size)
> + type Complex_Star_8 is new Complex;
> + type Complex_Kind_4 is new Complex;
> + type Complex_Star_16 is new Double_Complex;
> + type Complex_Kind_8 is new Double_Complex;
> + type Character_Kind_n is new Fortran_Character;
> function To_Fortran (Item : Character) return Character_Set;
> function To_Ada (Item : Character_Set) return Character;