serenity/Tests/LibWeb/Text/input/Wasm/WebAssembly-instantiate.html

<script src="../include.js"></script>
<script>
    asyncTest(async (done) => {
        let wasm;

        const lTextDecoder = typeof TextDecoder === 'undefined' ? (0, module.require)('util').TextDecoder : TextDecoder;

        let cachedTextDecoder = new lTextDecoder('utf-8', { ignoreBOM: true, fatal: true });

        cachedTextDecoder.decode();

        let cachedUint8Memory0 = null;

        function getUint8Memory0() {
            if (cachedUint8Memory0 === null || cachedUint8Memory0.byteLength === 0) {
                cachedUint8Memory0 = new Uint8Array(wasm.memory.buffer);
            }
            return cachedUint8Memory0;
        }

        function getStringFromWasm0(ptr, len) {
            ptr = ptr >>> 0;
            return cachedTextDecoder.decode(getUint8Memory0().subarray(ptr, ptr + len));
        }

        const exports = {
            "./wasm_test_bg.js": {
                __wbg_println_95d984b86202de7b(arg0, arg1) {
                    println(getStringFromWasm0(arg0, arg1));
                },
                greet() {
                    wasm.greet();
                },
            },
        };

        const arrayBuffer = new Uint8Array([
            0x00, 0x61, 0x73, 0x6d, 0x01, 0x00, 0x00, 0x00, 0x01, 0x09, 0x02, 0x60, 0x02, 0x7f, 0x7f, 0x00,
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        ]).buffer;

        const BUFFER_SOURCES = [
            { constructor: Uint8Array, flaky: true },
            { constructor: Uint8ClampedArray, flaky: true },
            { constructor: Uint16Array, flaky: true },
            { constructor: Uint32Array, flaky: true },
            { constructor: Int8Array, flaky: true },
            { constructor: Int16Array, flaky: true },
            { constructor: Float32Array, flaky: true },
            { constructor: Float64Array, flaky: true },
            { constructor: BigUint64Array, flaky: true },
            { constructor: BigInt64Array, flaky: true },
            { constructor: DataView, flaky: true },
        ];
        
        async function runTest(buffer) {
            println("-------------")
            println(buffer.constructor.name);
            println("-------------")
            const module = await WebAssembly.instantiate(buffer, exports);
            wasm = module.instance?.exports ?? module.exports;
            try {
                wasm.greet();
            } catch (e) {
                println(`FIXME: Failed to execute with ${buffer.constructor.name}: ${e.name}: ${e.message}`);
            }
            return Promise.resolve();
        }

        await runTest(arrayBuffer);

        for (const { constructor, flaky } of BUFFER_SOURCES) {
            if (!flaky) {
                await runTest(new constructor(arrayBuffer));
            } else {
                // The flakiness is the runtime either trapping with a RangeError, or the printed string being complete garbage,
                // which more prominently happens with DataView and the arrays bigger than u8. However, the RangeError flake is
                // still possible with u8.
                println(`FIXME: Run test for ${constructor.name}. Not running due to flakiness.`);
            }
        }

        if (false) {
            const compiledModule = await WebAssembly.compile(arrayBuffer);
            await runTest(compiledModule);
        } else {
            // Same issues as above.
            println(`FIXME: Run test for WebAssembly.Module. Not running due to flakiness.`);
        }

        done();
    });
</script>