1 use crate::wasm_config_t; 2 use wasmtime::Engine; 3 4 #[repr(C)] 5 #[derive(Clone)] 6 pub struct wasm_engine_t { 7 pub(crate) engine: Engine, 8 } 9 10 wasmtime_c_api_macros::declare_own!(wasm_engine_t); 11 12 #[no_mangle] 13 pub extern "C" fn wasm_engine_new() -> Box<wasm_engine_t> { 14 // Enable the `env_logger` crate since this is as good a place as any to 15 // support some "top level initialization" for the C API. Almost all support 16 // should go through this one way or another, so this ensures that 17 // `RUST_LOG` should work reasonably well. 18 // 19 // Note that we `drop` the result here since this fails after the first 20 // initialization attempt. We don't mind that though because this function 21 // can be called multiple times, so we just ignore the result. 22 drop(env_logger::try_init()); 23 24 Box::new(wasm_engine_t { 25 engine: Engine::default(), 26 }) 27 } 28 29 #[no_mangle] 30 pub extern "C" fn wasm_engine_new_with_config(c: Box<wasm_config_t>) -> Box<wasm_engine_t> { 31 let config = c.config; 32 Box::new(wasm_engine_t { 33 engine: Engine::new(&config).unwrap(), 34 }) 35 } 36