Subject: Re: SDL-News: Operator I defined can't be converted to C
doldi.laurent#wanadoo.fr
Date: Thu Feb 20 2003 - 08:52:21 GMT
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-----From doldi.laurent#wanadoo.fr to sdlnews -----
Dear Yang,
As you have experienced, axioms are not supported by some code generators.
In the last version of the language, SDL-2000, axioms have been removed.
Rather than using axioms, you can use the algorithmic form to
define operators in Tau SDL Suite. Here is a copy-paste from
an SDL model (described in my book) that works with Tau, where the
operator fill_Iframe is defined in textual algorithmic form:
NEWTYPE Iframe
STRUCT
DLCi DLCident;
data Idata;
length Integer; /* octets in data */
CRC Integer;
OPERATORS
fill_Iframe: DLCident, Idata, Integer, Integer->Iframe;
OPERATOR fill_Iframe;
FPAR dlc DLCident, D Idata, len Integer, Crc Integer;
RETURNS res Iframe;
START;
/* here you can use DECISION, JOIN, etc. */
TASK res := (. dlc, D, len, Crc .);
RETURN res;
ENDOPERATOR;
ENDNEWTYPE;
You can also use (in Tau) the graphical algorithmic operator
form. The syntax is similar to an SDL procedure.
The other option (tool-dependent) is to code SDL operators
(or procedures) in C.
Regards,
Laurent Doldi.
At 14:04 20/02/2003 +0800, you wrote:
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>-----From "Yang LIU" <lyly97#mails.tsinghua.edu.cn> to sdlnews -----
>
>I am using Telelogic tau suite 4.3, now I have a problem:
>I define a NewType and Operator in SDl like this:
>
>newtype Usec inherits Integer operators all;
> adding operators
> dUsec : Usec -> Duration;
> axioms
> for all u in Usec (for all d in Duration( for all r in Real(
> r = float(u) ==> dUsec(u) == Duration!(r); )));
> endnewtype Usec;
>
>But in generated C file, there have no C code for function dUsec,
>my question is :
>Is axioms useless in telelogic SDL?
>how generate C code of Operator dUsec?
>
>
>--End text from "Yang LIU" <lyly97#mails.tsinghua.edu.cn> to sdlnews ---
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>
Laurent DOLDI
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