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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
import { assert, assertEquals, assertRejects } from "./test_util.ts";
// The following blob can be created by taking the following s-expr and pass
// it through wat2wasm.
// (module
// (func $add (param $a i32) (param $b i32) (result i32)
// local.get $a
// local.get $b
// i32.add)
// (export "add" (func $add))
// )
// deno-fmt-ignore
const simpleWasm = new Uint8Array([
0x00, 0x61, 0x73, 0x6d, 0x01, 0x00, 0x00, 0x00, 0x01, 0x07, 0x01, 0x60,
0x02, 0x7f, 0x7f, 0x01, 0x7f, 0x03, 0x02, 0x01, 0x00, 0x07, 0x07, 0x01,
0x03, 0x61, 0x64, 0x64, 0x00, 0x00, 0x0a, 0x09, 0x01, 0x07, 0x00, 0x20,
0x00, 0x20, 0x01, 0x6a, 0x0b
]);
Deno.test(async function wasmInstantiateWorksWithBuffer() {
const { module, instance } = await WebAssembly.instantiate(simpleWasm);
assertEquals(WebAssembly.Module.exports(module), [{
name: "add",
kind: "function",
}]);
assertEquals(WebAssembly.Module.imports(module), []);
assert(typeof instance.exports.add === "function");
const add = instance.exports.add as (a: number, b: number) => number;
assertEquals(add(1, 3), 4);
});
// V8's default implementation of `WebAssembly.instantiateStreaming()` if you
// don't set the WASM streaming callback, is to take a byte source. Here we
// check that our implementation of the callback disallows it.
Deno.test(
async function wasmInstantiateStreamingFailsWithBuffer() {
await assertRejects(async () => {
await WebAssembly.instantiateStreaming(
// Bypassing the type system
simpleWasm as unknown as Promise<Response>,
);
}, TypeError);
},
);
Deno.test(
async function wasmInstantiateStreamingNoContentType() {
const response = new Response(simpleWasm);
// Rejects, not throws.
const wasmPromise = WebAssembly.instantiateStreaming(response);
await assertRejects(
() => wasmPromise,
TypeError,
"Invalid WebAssembly content type",
);
},
);
Deno.test(async function wasmInstantiateStreaming() {
let isomorphic = "";
for (const byte of simpleWasm) {
isomorphic += String.fromCharCode(byte);
}
const base64Url = "data:application/wasm;base64," + btoa(isomorphic);
const { module, instance } = await WebAssembly.instantiateStreaming(
fetch(base64Url),
);
assertEquals(WebAssembly.Module.exports(module), [{
name: "add",
kind: "function",
}]);
assertEquals(WebAssembly.Module.imports(module), []);
assert(typeof instance.exports.add === "function");
const add = instance.exports.add as (a: number, b: number) => number;
assertEquals(add(1, 3), 4);
});
Deno.test(
{ permissions: { read: true } },
async function wasmFileStreaming() {
const url = import.meta.resolve("../testdata/assets/unreachable.wasm");
assert(url.startsWith("file://"));
const { module } = await WebAssembly.instantiateStreaming(fetch(url));
assertEquals(WebAssembly.Module.exports(module), [{
name: "unreachable",
kind: "function",
}]);
},
);
Deno.test(
{ permissions: { net: true } },
async function wasmStreamingNonTrivial() {
// deno-dom's WASM file is a real-world non-trivial case that gave us
// trouble when implementing this.
await WebAssembly.instantiateStreaming(fetch(
"http://localhost:4545/assets/deno_dom_0.1.3-alpha2.wasm",
));
},
);
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