Unable to parse DPI calls

[Kuree]

Error:

    def _parse_error(self, msg, coord):
>       raise ParseError("%s: %s" % (coord, msg))
E       pyverilog.vparser.plyparser.ParseError: :1: before: import

SV:

import "DPI-C" function void breakpoint_trace(input int instance_id, input int stmt_id);

[Kuree]

This is not a high priority since I've found ways to bypass the parsing verilog by directly exposing module interface to magma.

Maybe it's a long-term goal to replace pyverilog with more advanced SV parser such as slang.

[leonardt]

@Kuree do you have any examples using slang to parse verilog via a Python API? I don't think our use of pyverilog is very advanced (we just parse the module name/interface), so migrating to a new parser should be quick/easy

[Kuree]

I only used slang in the context of C++ and it's fairly easy to use. I think it's straight-froward to create bindings in pybind, though requires some work. One major concern is that slang uses pretty recent C++ compiler and get it working on mac-os could be a pain.

Looking at other open source SV parser, I think we could also try out verible from Google. For completeness, here is the SV parser test suite: https://symbiflow.github.io/sv-tests/

slang is in par with verilator but much faster. I haven't used verible though.