fix(macros): Support visibility modifiers on model structs (#46)

.github/workflows/ci.yaml

@@ -29,6 +29,7 @@ jobs:
           cargo run --package example-verilog-project --bin tutorial # rerun
           cargo run --package example-verilog-project --bin dynamic_model_tutorial
           cargo run --package example-verilog-project --bin dpi_tutorial
+          cargo run --package example-verilog-project --bin visibility_works
       
   test_spade:
     strategy:

examples/verilog-project/Cargo.toml

@@ -21,6 +21,11 @@ path = "test/dynamic_model_tutorial.rs"
 name = "dpi_tutorial"
 path = "test/dpi_tutorial.rs"
 
+
+[[bin]]
+name = "visibility_works"
+path = "test/visibility_works.rs"
+
 [dependencies]
 snafu.workspace = true
 colog.workspace = true

examples/verilog-project/test/visibility_works.rs

@@ -0,0 +1,47 @@
+// Copyright (C) 2024 Ethan Uppal.
+//
+// This program is free software: you can redistribute it and/or modify it under
+// the terms of the GNU General Public License as published by the Free Software
+// Foundation, version 3 of the License only.
+//
+// This program is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+// details.
+//
+// You should have received a copy of the GNU General Public License along with
+// this program.  If not, see <https://www.gnu.org/licenses/>.
+
+use snafu::Whatever;
+use verilog::{VerilatorRuntime, VerilatorRuntimeOptions};
+
+mod enclosed {
+    use verilog::verilog;
+
+    #[verilog(src = "src/main.sv", name = "main")]
+    pub struct Main;
+}
+
+#[snafu::report]
+fn main() -> Result<(), Whatever> {
+    colog::init();
+
+    let mut runtime = VerilatorRuntime::new(
+        "artifacts3".into(),
+        &["src/main.sv".as_ref()],
+        [],
+        VerilatorRuntimeOptions::default(),
+        true,
+    )?;
+
+    let mut main = runtime.create_model::<enclosed::Main>()?;
+
+    main.medium_input = u32::MAX;
+    println!("{}", main.medium_output);
+    assert_eq!(main.medium_output, 0);
+    main.eval();
+    println!("{}", main.medium_output);
+    assert_eq!(main.medium_output, u32::MAX);
+
+    Ok(())
+}

language-support/verilog-macro-builder/src/lib.rs

@@ -223,9 +223,10 @@ pub fn build_verilated_struct(
     });
 
     let struct_name = item.ident;
+    let vis = item.vis;
     let port_count = verilated_model_ports_impl.len();
     quote! {
-        struct #struct_name<'ctx> {
+        #vis struct #struct_name<'ctx> {
             #(#struct_members),*,
             #[doc = "# Safety\nThe Rust binding to the model will not outlive the dynamic library context (with lifetime `'ctx`) and is dropped when this struct is."]
             model: *mut #crate_name::__reexports::libc::c_void,