svling 0.2.1

SystemVerilog compiler+runtime: pyslang frontend (sling) + Rust vvp engine (evvp)

svling

SystemVerilog compiler + runtime in one package.

svling bundles two pieces:

• sling — a SystemVerilog → VVP compiler frontend built on pyslang (full IEEE 1800-2023 LRM coverage).
• evvp — a Rust reimplementation of Icarus Verilog's vvp runtime, exposed to Python via pyo3 and invoked in-process.

The two halves ship as a single wheel containing the Python compiler sources and one sling/_native.abi3.so carrying the entire runtime.

Install

pip install svling
# or
uv tool install svling

Use

# Compile and run in one go:
svling design.sv tb.sv

# Compile only (write a .vvp file):
sling -o design.vvp design.sv

# Run a pre-compiled .vvp through the Rust runtime in-process:
python -c "from sling._native import run_cli; run_cli(['evvp', '-N', 'design.vvp'])"

Anything that starts with + on the svling command line is forwarded to the runtime as a Verilog plusarg (e.g. +verbose, +seed=42). Use -- to forward arbitrary extra flags to the runtime.

Layout

svling/
├── sling/          Python frontend (pyslang → VVP)
├── evvp/           Rust crate: VVP runtime; produces both a standalone
│                   `evvp` binary and a pyo3 cdylib for the wheel
├── tests/          Sample SystemVerilog used by the docs
└── pyproject.toml  maturin build, project metadata, console scripts

License

GPL-2.0-or-later. evvp is a clean-room reimplementation of Icarus Verilog's vvp, which is GPL-2.0; this package keeps the same license.