docs: working selfhosted example

Signed-off-by: Henry Gressmann <mail@henrygressmann.de>

1 files changed, 39 insertions, 15 deletions

diff --git a/examples/wasm-rust.rs b/examples/wasm-rust.rs
index 21d3eb8..3b8877e 100644
--- a/examples/wasm-rust.rs
+++ b/examples/wasm-rust.rs
@@ -7,35 +7,59 @@ fn main() -> Result<()> {
         println!("Usage: cargo run --example wasm-rust <rust_example>");
         println!("Available examples:");
         println!("  hello");
+        println!("  tinywasm");
         return Ok(());
     }
 
     match args[1].as_str() {
         "hello" => hello()?,
+        "tinywasm" => tinywasm()?,
         _ => {}
     }
 
     Ok(())
 }
 
+fn tinywasm() -> Result<()> {
+    const TINYWASM: &[u8] = include_bytes!("./rust/out/tinywasm.wasm");
+    let module = Module::parse_bytes(&TINYWASM)?;
+    let mut store = Store::default();
+
+    let mut imports = Imports::new();
+    imports.define(
+        "env",
+        "printi32",
+        Extern::typed_func(|_: FuncContext<'_>, x: i32| {
+            println!("{}", x);
+            Ok(())
+        }),
+    )?;
+    let instance = module.instantiate(&mut store, Some(imports))?;
+
+    let hello = instance.typed_func::<(), ()>(&mut store, "hello")?;
+    hello.call(&mut store, ())?;
+
+    Ok(())
+}
+
 fn hello() -> Result<()> {
-    // const HELLO_WASM: &[u8] = include_bytes!("./rust/out/hello.wasm");
-    // let module = Module::parse_bytes(&HELLO_WASM)?;
-    // let mut store = Store::default();
+    const HELLO_WASM: &[u8] = include_bytes!("./rust/out/hello.wasm");
+    let module = Module::parse_bytes(&HELLO_WASM)?;
+    let mut store = Store::default();
 
-    // let mut imports = Imports::new();
-    // imports.define(
-    //     "env",
-    //     "printi32",
-    //     Extern::typed_func(|_: FuncContext<'_>, x: i32| {
-    //         println!("{}", x);
-    //         Ok(())
-    //     }),
-    // )?;
+    let mut imports = Imports::new();
+    imports.define(
+        "env",
+        "printi32",
+        Extern::typed_func(|_: FuncContext<'_>, x: i32| {
+            println!("{}", x);
+            Ok(())
+        }),
+    )?;
 
-    // let instance = module.instantiate(&mut store, Some(imports))?;
-    // let add_and_print = instance.typed_func::<(i32, i32), ()>(&mut store, "add_and_print")?;
-    // add_and_print.call(&mut store, (1, 2))?;
+    let instance = module.instantiate(&mut store, Some(imports))?;
+    let add_and_print = instance.typed_func::<(i32, i32), ()>(&mut store, "add_and_print")?;
+    add_and_print.call(&mut store, (1, 2))?;
 
     Ok(())
 }