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

[Maciej S. <mac...@ce...>]

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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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