Re: [Iverilog-devel] Support for dynamic arrays in the VPI

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

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This created some chaos in the vec4-stack branch. Totally not
your fault, but it is encouraging me to get my act together and
get it merged into the master branch as soon as possible.


On 11/28/2014 05:33 AM, Maciej Sumiński wrote:
> Hi Steve,
> 
> The VPI functions to access dynamic arrays are ready to be merged. 
> This is the groundwork that will allow me to write support for 
> functions working with std_logic_vectors of undefined size, that
> has been my desire for a long time already.
> 
> The pull request [1] also includes a previously sent branch that 
> introduced type casting in SV. As usual, the new features are 
> demonstrated with tests [2].
> 
> I think changes to VPI code deserve some further explanation. I did
> my best to reuse as much of existing code as possible. As the
> result, I added __vpiArrayBase type that gathers common traits of
> both static and dynamic arrays (respectively __vpiArray and
> __vpiDarray). There are also __vpiArrayIndex, __vpiArrayWord and
> __vpiArrayIterator that are used by both classes.
> 
> A few static C functions that were called only by class methods
> are moved directly to appropriate methods (e.g. grep for 
> vpi_array_var_word_get_value). A bunch of others are transformed
> to methods, in case they were operating on an instance of a class
> (see decode_array_word_pointer).
> 
> As I have written recently, there is one thing left. If vectors
> are used as the array element type, then there is no way to check
> the details (2 vs 4-state logic and signedness).
> 
> Regards, Orson
> 
> 1. https://github.com/steveicarus/iverilog/pull/49 2.
> https://github.com/orsonmmz/ivtest/tree/darray_vpi_test
> 

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Steve Williams                "The woods are lovely, dark and deep.
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