add benchmark script

benchmarks/wasm/src/lib.rs

@@ -0,0 +1,25 @@
+#![warn(clippy::missing_safety_doc)]
+
+use mlua::Lua;
+use std::ffi::{c_char, c_int, CStr};
+
+#[no_mangle]
+pub unsafe extern "C" fn execute(program: *const c_char, argc: c_int, argv: *const *const c_char) {
+    let lua = Lua::new();
+    let lua_globals = lua.globals();
+
+    // set 'arg' (argv) value, this allows to manipulate the behavior of the scripts
+    let arg = lua.create_table().unwrap();
+    arg.set(-1, "mlua").unwrap();
+    arg.set(0, "execute").unwrap();
+    for i in 0..argc {
+        let argv_arg = CStr::from_ptr(*argv.offset(i as isize));
+        arg.push(argv_arg.to_str().unwrap()).unwrap();
+    }
+    lua_globals.set("arg", arg).unwrap();
+
+    let exec = CStr::from_ptr(program).to_str().unwrap();
+    if let Err(err) = lua.load(exec).exec() {
+        eprintln!("{}", err)
+    }
+}