Re: [BLACKBOX] Order of calculating parameters

From: [at]} <Norayr>
Date: Thu, 7 Feb 2013 20:56:38 +0400

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As far as I understand, left to right order is a conequence of the concept
that compiler can be one pass. So you just parse once from left to right.
In C the order is right to left because they think it is convenient to
have the first argument on the top of the stack.

---
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On Thu, 7 Feb 2013, Josef Templ wrote:
> 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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>
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Received on Thu Feb 07 2013 - 17:56:38 UTC