(unknown charset) Re: [BLACKBOX] Order of calculating parameters

From: (unknown charset) [at]} <Josef>
Date: Thu, 7 Feb 2013 17:42:14 +0100

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in more recent languages such as Java or C# the evaluation order of
operands (incl. parameters) is always defined from left to right.
In Oberon, however, as far as I remember, it is left undefined.
The reason, as you mentioned, is that different platforms
may have different calling conventions and it leaves a bit more
freedom for the compiler to do optimizations.

- Josef


----- Original Message -----
From: "Oleg N. Cher" <allot{([at]})nowhere.xy
To: <BLACKBOX{([at]})nowhere.xy
Sent: Thursday, February 07, 2013 4:41 PM
Subject: [BLACKBOX] Order of calculating parameters


> Dear All,
>
> Is the order of calculating parameters uniquely defined in standard of
> Component Pascal (or Oberon/Oberon-2)? I've this situation.
>
> PROCEDURE GetData (): INTEGER;
> BEGIN (* The data is taken from array "arr", indexed by var "idx". Order
> of taken data is one by one. *)
> INC(idx); RETURN arr[idx]
> END GetData;
>
> ...
> (* Example code: *)
> PutTile(GetData(), GetData(), GetData()); (* x, y, tile number *)
> ...
>
> If the order always left to right (as, in Turbo Pascal/Delphi, data must
> be: x, y, tileNum.
> If the order always right to left (just as, in some C compilers) data
> must be: tileNum, y, x.
>
> I understand of course, that things depends on used calling convention
> model. But standards of Oberons must provide the own independent order,
> as I think.
>
>
> --
> Oleg N. Cher
> VEDAsoft Oberon Club
> http://zx.oberon2.ru
>
>
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Received on Thu Feb 07 2013 - 17:42:14 UTC