Re: [Iverilog-devel] 'image attribute

[Stephen W. <st...@ic...>]

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Hmm... I think the proper answer is to define in the sv_vpi_user.h
a vpiStringFunc that is probably a value like 10 so that it is sure
to not intefere with other declaration. I'd put it in the sv_vpi_user.h
header file instead of the vpi_user.h header file so that it does not
pollute the vpi_user.h name space.

You are right that the SV standard doesn't have a code for string
return values, but I think we want such things, and absent any other
standard on the matter, we can define what we want.

It's either that, or start implementing DPI. Big job.

On 12/07/2015 12:48 PM, Maciej Sumiński wrote:
> True, I prefer to follow this way too. The thing is, $sformatf
> returns a string, which is seemingly impossible with the VPI
> interface. There are function types: vpiSysFuncInt, vpiSysFuncReal,
> vpiSysFuncTime and vpiSysFuncSized. I was wondering if adding
> vpiSysFuncString (in a separate header, so the original one is not
> polluted) is acceptable or is there any better method.
> 
> Regards, Orson
> 
> On 12/07/2015 07:11 PM, Stephen Williams wrote:
>> 
>> First guess, I think the best would be to implement $sformatf. It
>> is something that we would need anyhow. On 12/07/2015 08:52 AM,
>> Maciej Sumi?ski wrote:
>>> Hi,
>> 
>>> I am wondering what would be the right way to implement VHDL 
>>> 'image attribute, which returns a string representation of a 
>>> variable.
>> 
>>> The first idea is to use SV $sformatf system function, which 
>>> returns a string based on the formatting string (e.g. "%d" and 
>>> input data, but it is currently not available in Icarus. I
>>> could add it, but as far as I know, the VPI standard does not
>>> allow to write functions that return strings.
>> 
>>> What's your opinion? Should I extend VPI in Icarus to allow 
>>> returning strings or is there another, more elegant solution to
>>> the problem?
>> 
>>> Regards, Orson
>> 
>> 
>> 
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> 
> 
> 
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- -- 
Steve Williams                "The woods are lovely, dark and deep.
steve at icarus.com           But I have promises to keep,
http://www.icarus.com         and lines to code before I sleep,
http://www.picturel.com       And lines to code before I sleep."
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