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341 lines
10 KiB
341 lines
10 KiB
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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const Template = require("../Template");
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const WebAssemblyUtils = require("./WebAssemblyUtils");
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/** @typedef {import("../Module")} Module */
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/** @typedef {import("../MainTemplate")} MainTemplate */
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// Get all wasm modules
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const getAllWasmModules = chunk => {
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const wasmModules = chunk.getAllAsyncChunks();
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const array = [];
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for (const chunk of wasmModules) {
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for (const m of chunk.modulesIterable) {
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if (m.type.startsWith("webassembly")) {
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array.push(m);
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}
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}
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}
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return array;
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};
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/**
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* generates the import object function for a module
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* @param {Module} module the module
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* @param {boolean} mangle mangle imports
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* @returns {string} source code
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*/
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const generateImportObject = (module, mangle) => {
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const waitForInstances = new Map();
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const properties = [];
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const usedWasmDependencies = WebAssemblyUtils.getUsedDependencies(
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module,
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mangle
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);
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for (const usedDep of usedWasmDependencies) {
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const dep = usedDep.dependency;
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const importedModule = dep.module;
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const exportName = dep.name;
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const usedName = importedModule && importedModule.isUsed(exportName);
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const description = dep.description;
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const direct = dep.onlyDirectImport;
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const module = usedDep.module;
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const name = usedDep.name;
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if (direct) {
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const instanceVar = `m${waitForInstances.size}`;
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waitForInstances.set(instanceVar, importedModule.id);
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properties.push({
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module,
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name,
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value: `${instanceVar}[${JSON.stringify(usedName)}]`
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});
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} else {
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const params = description.signature.params.map(
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(param, k) => "p" + k + param.valtype
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);
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const mod = `installedModules[${JSON.stringify(importedModule.id)}]`;
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const func = `${mod}.exports[${JSON.stringify(usedName)}]`;
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properties.push({
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module,
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name,
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value: Template.asString([
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(importedModule.type.startsWith("webassembly")
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? `${mod} ? ${func} : `
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: "") + `function(${params}) {`,
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Template.indent([`return ${func}(${params});`]),
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"}"
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])
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});
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}
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}
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let importObject;
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if (mangle) {
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importObject = [
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"return {",
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Template.indent([
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properties.map(p => `${JSON.stringify(p.name)}: ${p.value}`).join(",\n")
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]),
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"};"
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];
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} else {
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const propertiesByModule = new Map();
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for (const p of properties) {
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let list = propertiesByModule.get(p.module);
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if (list === undefined) {
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propertiesByModule.set(p.module, (list = []));
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}
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list.push(p);
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}
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importObject = [
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"return {",
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Template.indent([
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Array.from(propertiesByModule, ([module, list]) => {
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return Template.asString([
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`${JSON.stringify(module)}: {`,
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Template.indent([
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list.map(p => `${JSON.stringify(p.name)}: ${p.value}`).join(",\n")
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]),
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"}"
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]);
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}).join(",\n")
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]),
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"};"
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];
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}
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if (waitForInstances.size === 1) {
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const moduleId = Array.from(waitForInstances.values())[0];
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const promise = `installedWasmModules[${JSON.stringify(moduleId)}]`;
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const variable = Array.from(waitForInstances.keys())[0];
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return Template.asString([
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`${JSON.stringify(module.id)}: function() {`,
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Template.indent([
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`return promiseResolve().then(function() { return ${promise}; }).then(function(${variable}) {`,
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Template.indent(importObject),
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"});"
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]),
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"},"
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]);
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} else if (waitForInstances.size > 0) {
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const promises = Array.from(
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waitForInstances.values(),
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id => `installedWasmModules[${JSON.stringify(id)}]`
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).join(", ");
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const variables = Array.from(
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waitForInstances.keys(),
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(name, i) => `${name} = array[${i}]`
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).join(", ");
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return Template.asString([
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`${JSON.stringify(module.id)}: function() {`,
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Template.indent([
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`return promiseResolve().then(function() { return Promise.all([${promises}]); }).then(function(array) {`,
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Template.indent([`var ${variables};`, ...importObject]),
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"});"
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]),
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"},"
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]);
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} else {
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return Template.asString([
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`${JSON.stringify(module.id)}: function() {`,
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Template.indent(importObject),
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"},"
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]);
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}
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};
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class WasmMainTemplatePlugin {
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constructor({ generateLoadBinaryCode, supportsStreaming, mangleImports }) {
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this.generateLoadBinaryCode = generateLoadBinaryCode;
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this.supportsStreaming = supportsStreaming;
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this.mangleImports = mangleImports;
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}
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/**
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* @param {MainTemplate} mainTemplate main template
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* @returns {void}
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*/
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apply(mainTemplate) {
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mainTemplate.hooks.localVars.tap(
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"WasmMainTemplatePlugin",
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(source, chunk) => {
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const wasmModules = getAllWasmModules(chunk);
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if (wasmModules.length === 0) return source;
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const importObjects = wasmModules.map(module => {
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return generateImportObject(module, this.mangleImports);
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});
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return Template.asString([
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source,
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"",
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"// object to store loaded and loading wasm modules",
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"var installedWasmModules = {};",
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"",
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// This function is used to delay reading the installed wasm module promises
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// by a microtask. Sorting them doesn't help because there are egdecases where
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// sorting is not possible (modules splitted into different chunks).
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// So we not even trying and solve this by a microtask delay.
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"function promiseResolve() { return Promise.resolve(); }",
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"",
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"var wasmImportObjects = {",
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Template.indent(importObjects),
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"};"
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]);
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}
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);
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mainTemplate.hooks.requireEnsure.tap(
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"WasmMainTemplatePlugin",
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(source, chunk, hash) => {
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const webassemblyModuleFilename =
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mainTemplate.outputOptions.webassemblyModuleFilename;
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const chunkModuleMaps = chunk.getChunkModuleMaps(m =>
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m.type.startsWith("webassembly")
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);
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if (Object.keys(chunkModuleMaps.id).length === 0) return source;
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const wasmModuleSrcPath = mainTemplate.getAssetPath(
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JSON.stringify(webassemblyModuleFilename),
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{
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hash: `" + ${mainTemplate.renderCurrentHashCode(hash)} + "`,
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hashWithLength: length =>
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`" + ${mainTemplate.renderCurrentHashCode(hash, length)} + "`,
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module: {
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id: '" + wasmModuleId + "',
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hash: `" + ${JSON.stringify(
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chunkModuleMaps.hash
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)}[wasmModuleId] + "`,
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hashWithLength(length) {
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const shortChunkHashMap = Object.create(null);
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for (const wasmModuleId of Object.keys(chunkModuleMaps.hash)) {
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if (typeof chunkModuleMaps.hash[wasmModuleId] === "string") {
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shortChunkHashMap[wasmModuleId] = chunkModuleMaps.hash[
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wasmModuleId
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].substr(0, length);
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}
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}
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return `" + ${JSON.stringify(
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shortChunkHashMap
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)}[wasmModuleId] + "`;
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}
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}
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}
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);
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const createImportObject = content =>
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this.mangleImports
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? `{ ${JSON.stringify(
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WebAssemblyUtils.MANGLED_MODULE
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)}: ${content} }`
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: content;
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return Template.asString([
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source,
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"",
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"// Fetch + compile chunk loading for webassembly",
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"",
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`var wasmModules = ${JSON.stringify(
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chunkModuleMaps.id
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)}[chunkId] || [];`,
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"",
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"wasmModules.forEach(function(wasmModuleId) {",
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Template.indent([
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"var installedWasmModuleData = installedWasmModules[wasmModuleId];",
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"",
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'// a Promise means "currently loading" or "already loaded".',
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"if(installedWasmModuleData)",
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Template.indent(["promises.push(installedWasmModuleData);"]),
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"else {",
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Template.indent([
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`var importObject = wasmImportObjects[wasmModuleId]();`,
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`var req = ${this.generateLoadBinaryCode(wasmModuleSrcPath)};`,
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"var promise;",
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this.supportsStreaming
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? Template.asString([
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"if(importObject instanceof Promise && typeof WebAssembly.compileStreaming === 'function') {",
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Template.indent([
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"promise = Promise.all([WebAssembly.compileStreaming(req), importObject]).then(function(items) {",
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Template.indent([
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`return WebAssembly.instantiate(items[0], ${createImportObject(
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"items[1]"
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)});`
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]),
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"});"
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]),
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"} else if(typeof WebAssembly.instantiateStreaming === 'function') {",
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Template.indent([
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`promise = WebAssembly.instantiateStreaming(req, ${createImportObject(
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"importObject"
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)});`
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])
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])
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: Template.asString([
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"if(importObject instanceof Promise) {",
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Template.indent([
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"var bytesPromise = req.then(function(x) { return x.arrayBuffer(); });",
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"promise = Promise.all([",
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Template.indent([
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"bytesPromise.then(function(bytes) { return WebAssembly.compile(bytes); }),",
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"importObject"
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]),
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"]).then(function(items) {",
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Template.indent([
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`return WebAssembly.instantiate(items[0], ${createImportObject(
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"items[1]"
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)});`
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]),
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"});"
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])
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]),
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"} else {",
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Template.indent([
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"var bytesPromise = req.then(function(x) { return x.arrayBuffer(); });",
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"promise = bytesPromise.then(function(bytes) {",
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Template.indent([
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`return WebAssembly.instantiate(bytes, ${createImportObject(
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"importObject"
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)});`
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]),
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"});"
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]),
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"}",
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"promises.push(installedWasmModules[wasmModuleId] = promise.then(function(res) {",
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Template.indent([
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`return ${mainTemplate.requireFn}.w[wasmModuleId] = (res.instance || res).exports;`
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]),
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"}));"
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]),
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"}"
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]),
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"});"
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]);
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}
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);
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mainTemplate.hooks.requireExtensions.tap(
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"WasmMainTemplatePlugin",
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(source, chunk) => {
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if (!chunk.hasModuleInGraph(m => m.type.startsWith("webassembly"))) {
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return source;
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}
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return Template.asString([
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source,
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"",
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"// object with all WebAssembly.instance exports",
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`${mainTemplate.requireFn}.w = {};`
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]);
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}
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);
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mainTemplate.hooks.hash.tap("WasmMainTemplatePlugin", hash => {
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hash.update("WasmMainTemplatePlugin");
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hash.update("2");
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});
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}
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}
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module.exports = WasmMainTemplatePlugin;
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