rust runtime

runtime/.gitignore

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+target/

runtime/Cargo.toml

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+[package]
+name = "gyehoek-runtime"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+clap = { version = "4.6.1", features = ["derive"] }
+clio = { version = "0.3.5", features = ["clap-parse"] }
+wasmtime = "46.0.1"

runtime/default.nix

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+{ rustPlatform
+}:
+
+rustPlatform.buildRustPackage (finalAttrs: {
+  pname = "gyehoek-runtime";
+  version = "0.1.0";
+  src = ./.;
+  cargoLock = {
+    lockFile = ./Cargo.lock;
+  };
+  doCheck = true;
+})

runtime/src/gyehoek.rs

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+use wasmtime::*;
+
+pub fn say_hi (_caller : Caller<'_, u32>) {
+    println! ("hiiii~")
+}

runtime/src/main.rs

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+mod gyehoek;
+
+use std::io;
+use std::io::Read;
+use clio::*;
+use clap::Parser;
+use wasmtime::*;
+
+/// A runtime for Gyehoek scheme.
+#[derive(Parser, Debug)]
+#[command(name = "gyehoek", version, about, long_about = None)]
+struct Args {
+    /// Input file
+    #[clap(value_parser)]
+    input: Input,
+}
+
+fn read<R : Read> (mut rdr : R) -> io::Result<Vec<u8>> {
+    let mut buf = vec! [];
+    rdr.read_to_end (&mut buf)?;
+    Ok (buf)
+}
+
+pub fn main () -> wasmtime::Result<()> {
+    let args = Args::parse ();
+    let engine = Engine::default ();
+    let module = Module::new (&engine, read (args.input)?)?;
+    let mut linker = Linker::new (&engine);
+    linker.func_wrap ("gyehoek", "say-hi", gyehoek::say_hi)?;
+    let mut store : Store<u32> = Store::new (&engine, 4);
+    let instance = linker.instantiate (&mut store, &module)?;
+    let main = instance.get_typed_func::<(),()> (&mut store, "main")?;
+    main.call (&mut store, ())?;
+    Ok (())
+}

runtime/t.wat

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+(module
+ (import "gyehoek" "say-hi" (func $say-hi))
+ (func (export "main")
+       (call $say-hi)
+       (call $say-hi)
+       (call $say-hi)))