MyJSPIAsLibraryWorkerGlue.js

/*
 * Copyright (C) 2024 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */



async function setupModule(Module, wasmModule, wasmMemory) {
    let response = await fetch("./JSPIAsLibrary.js");
    let loader = await response.text();
    eval(loader);
}

function trap() { console.assert(false, "trap was called from worker"); }

globalThis.onmessage = async function onmessage(m) {
    var wasmModule = m.data[0];
    var wasmMemory = m.data[1];

    var resolveWasmReady;
    var wasmReady = new Promise(resolve => (resolveWasmReady = resolve));

    async function buildGlue(imports, instanceReady) {
        // This part would be generalized
        imports.env._workerPromiseAdd = trap;
        let instance = await WebAssembly.instantiate(wasmModule, imports);

        instanceReady(instance);
        let workerPromiseFibTableIndex = getEmptyTableSlot();
        setWasmTableEntry(workerPromiseFibTableIndex, instance.exports.workerPromiseFib);
        resolveWasmReady(instance);
    }

    globalThis.Module = {
        instantiateWasm: buildGlue,
        wasmMemory,
    };

    let response = await fetch("./JSPIAsLibrary.js");

    let setupModule = new Function("Module", "wasmModule", "wasmMemory", `${await response.text()} return { getEmptyTableSlot, setWasmTableEntry }`);

    var { getEmptyTableSlot, setWasmTableEntry } = setupModule(Module, wasmModule, wasmMemory);
    await wasmReady;
    console.log("wasm ready");
    postMessage("wasm ready");
    Module._wasmMain();
}