rust runtime

runtime/src/gyehoek.rs

@@ -0,0 +1,5 @@
+use wasmtime::*;
+
+pub fn say_hi (_caller : Caller<'_, u32>) {
+    println! ("hiiii~")
+}

runtime/src/main.rs

@@ -0,0 +1,35 @@
+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 {
+    /// Path to Wasm binary or textual source
+    #[clap(value_parser)]
+    wasm: 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.wasm)?)?;
+    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 (())
+}