Re: [Iverilog-devel] Why use SFT files?

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

VPI modules can be dynamically loaded by vvp in Windows and Mac, so
shouldn't that same functionality work with ivl on Windows? The
vvp/ivl_dlfcn.h header file encapsulates this. Perhaps that header can
be moved to libmisc.

On Wed, Oct 23, 2019 at 8:18 AM Martin Whitaker
<ic...@ma...> wrote:
>
> This was triggered by my writing a regression test for the recently
> reported bug, and finding that vpi_reg.pl didn't really support tests with
> SFT files...
>
> I've implemented the compiler change to read VPI modules directly in the
> sft-rework branch. Apart from exposing another issue in the vlog95 target,
> all the existing tests still pass.
>
> Implementing this for Linux was pretty easy. Fixing the problems in Windows
> took a bit longer. As far as I can tell, there's no way for a DLL to
> automatically link to functions provided by the client application. The
> existing approach of linking the VPI module to vvp meant it couldn't then
> be used by the compiler. I solved that by passing a jump table down to the
> VPI module when it was loaded.
>
> See what you think. There's a sft_rework branch in the test suite which
> makes vpi_reg.pl use the new functionality.
>
> Stephen Williams wrote:
> > Because the .sft has some specificity that the .vpi does not have?
> > Also, to read the .vpi file, you need to dynamically link it in so
> > that you can read the tables. The ivl program currently does not need
> > to load .vpi files, it can use the .sft files instead.
> >
> > That may be obsolete thinking, though...
> >
> > On Sun, Oct 20, 2019 at 12:19 PM Martin Whitaker
> > <ic...@ma...> wrote:
> >>
> >> It is easy enough to extract the information from the .vpi file. I've
> >> written a small standalone utility that does just that and writes out a
> >> .sft file. But why not get the compiler to do it on the fly, rather than go
> >> though an intermediate step?
> >>
> >>
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> >
> >
> >
>
>
>
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-- 
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