Small example of how to serialize a compiled wasm module, and then instantiate it from the compilation artifacts.
()
| 438 | // Small example of how to serialize a compiled wasm module, and then |
| 439 | // instantiate it from the compilation artifacts. |
| 440 | func ExampleModule_serialize() { |
| 441 | // Configure the initial compilation environment. |
| 442 | engine := wasmtime.NewEngine() |
| 443 | |
| 444 | // Compile the wasm module into an in-memory instance of a `Module`. |
| 445 | wasm, err := wasmtime.Wat2Wasm(` |
| 446 | (module |
| 447 | (func $hello (import "" "hello")) |
| 448 | (func (export "run") (call $hello)) |
| 449 | ) |
| 450 | `) |
| 451 | if err != nil { |
| 452 | log.Fatal(err) |
| 453 | } |
| 454 | module, err := wasmtime.NewModule(engine, wasm) |
| 455 | if err != nil { |
| 456 | log.Fatal(err) |
| 457 | } |
| 458 | bytes, err := module.Serialize() |
| 459 | if err != nil { |
| 460 | log.Fatal(err) |
| 461 | } |
| 462 | |
| 463 | // Configure the initial compilation environment. |
| 464 | store := wasmtime.NewStore(wasmtime.NewEngine()) |
| 465 | |
| 466 | // Deserialize the compiled module. |
| 467 | module, err = wasmtime.NewModuleDeserialize(store.Engine, bytes) |
| 468 | if err != nil { |
| 469 | log.Fatal(err) |
| 470 | } |
| 471 | |
| 472 | // Here we handle the imports of the module, which in this case is our |
| 473 | // `helloFunc` callback. |
| 474 | helloFunc := wasmtime.WrapFunc(store, func() { |
| 475 | fmt.Println("Calling back...") |
| 476 | fmt.Println("> Hello World!") |
| 477 | }) |
| 478 | |
| 479 | // Once we've got that all set up we can then move to the instantiation |
| 480 | // phase, pairing together a compiled module as well as a set of imports. |
| 481 | // Note that this is where the wasm `start` function, if any, would run. |
| 482 | instance, err := wasmtime.NewInstance(store, module, []wasmtime.AsExtern{helloFunc}) |
| 483 | if err != nil { |
| 484 | log.Fatal(err) |
| 485 | } |
| 486 | |
| 487 | // Next we poke around a bit to extract the `run` function from the module. |
| 488 | run := instance.GetFunc(store, "run") |
| 489 | if run == nil { |
| 490 | log.Fatal("Failed to find function export `run`") |
| 491 | } |
| 492 | |
| 493 | // And last but not least we can call it! |
| 494 | fmt.Println("Calling export...") |
| 495 | _, err = run.Call(store) |
| 496 | if err != nil { |
| 497 | log.Fatal(err) |