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AsyncWebAssemblyJavascriptGenerator.js
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Wed, Feb 19, 06:15

AsyncWebAssemblyJavascriptGenerator.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const { RawSource } = require("webpack-sources");
const Generator = require("../Generator");
const InitFragment = require("../InitFragment");
const RuntimeGlobals = require("../RuntimeGlobals");
const Template = require("../Template");
const WebAssemblyImportDependency = require("../dependencies/WebAssemblyImportDependency");
/** @typedef {import("webpack-sources").Source} Source */
/** @typedef {import("../DependencyTemplates")} DependencyTemplates */
/** @typedef {import("../Generator").GenerateContext} GenerateContext */
/** @typedef {import("../Module")} Module */
/** @typedef {import("../NormalModule")} NormalModule */
/** @typedef {import("../RuntimeTemplate")} RuntimeTemplate */
const TYPES = new Set(["webassembly"]);
class AsyncWebAssemblyJavascriptGenerator extends Generator {
constructor(filenameTemplate) {
super();
this.filenameTemplate = filenameTemplate;
}
/**
* @param {NormalModule} module fresh module
* @returns {Set<string>} available types (do not mutate)
*/
getTypes(module) {
return TYPES;
}
/**
* @param {NormalModule} module the module
* @param {string=} type source type
* @returns {number} estimate size of the module
*/
getSize(module, type) {
return 40 + module.dependencies.length * 10;
}
/**
* @param {NormalModule} module module for which the code should be generated
* @param {GenerateContext} generateContext context for generate
* @returns {Source} generated code
*/
generate(module, generateContext) {
const {
runtimeTemplate,
chunkGraph,
moduleGraph,
runtimeRequirements,
runtime
} = generateContext;
runtimeRequirements.add(RuntimeGlobals.module);
runtimeRequirements.add(RuntimeGlobals.moduleId);
runtimeRequirements.add(RuntimeGlobals.exports);
runtimeRequirements.add(RuntimeGlobals.instantiateWasm);
/** @type {InitFragment[]} */
const initFragments = [];
/** @type {Map<Module, { request: string, importVar: string }>} */
const depModules = new Map();
/** @type {Map<string, WebAssemblyImportDependency[]>} */
const wasmDepsByRequest = new Map();
for (const dep of module.dependencies) {
if (dep instanceof WebAssemblyImportDependency) {
const module = moduleGraph.getModule(dep);
if (!depModules.has(module)) {
depModules.set(module, {
request: dep.request,
importVar: `WEBPACK_IMPORTED_MODULE_${depModules.size}`
});
}
let list = wasmDepsByRequest.get(dep.request);
if (list === undefined) {
list = [];
wasmDepsByRequest.set(dep.request, list);
}
list.push(dep);
}
}
const promises = [];
const importStatements = Array.from(
depModules,
([importedModule, { request, importVar }]) => {
if (moduleGraph.isAsync(importedModule)) {
promises.push(importVar);
}
return runtimeTemplate.importStatement({
update: false,
module: importedModule,
chunkGraph,
request,
originModule: module,
importVar,
runtimeRequirements
});
}
);
const importsCode = importStatements.map(([x]) => x).join("");
const importsCompatCode = importStatements.map(([_, x]) => x).join("");
const importObjRequestItems = Array.from(
wasmDepsByRequest,
([request, deps]) => {
const exportItems = deps.map(dep => {
const importedModule = moduleGraph.getModule(dep);
const importVar = depModules.get(importedModule).importVar;
return `${JSON.stringify(
dep.name
)}: ${runtimeTemplate.exportFromImport({
moduleGraph,
module: importedModule,
request,
exportName: dep.name,
originModule: module,
asiSafe: true,
isCall: false,
callContext: false,
defaultInterop: true,
importVar,
initFragments,
runtime,
runtimeRequirements
})}`;
});
return Template.asString([
`${JSON.stringify(request)}: {`,
Template.indent(exportItems.join(",\n")),
"}"
]);
}
);
const importsObj =
importObjRequestItems.length > 0
? Template.asString([
"{",
Template.indent(importObjRequestItems.join(",\n")),
"}"
])
: undefined;
const instantiateCall =
`${RuntimeGlobals.instantiateWasm}(${module.exportsArgument}, ${
module.moduleArgument
}.id, ${JSON.stringify(
chunkGraph.getRenderedModuleHash(module, runtime)
)}` + (importsObj ? `, ${importsObj})` : `)`);
const source = new RawSource(
`${importsCode}${
promises.length > 1
? Template.asString([
`${module.moduleArgument}.exports = Promise.all([${promises.join(
", "
)}]).then(${runtimeTemplate.basicFunction(
`[${promises.join(", ")}]`,
`${importsCompatCode}return ${instantiateCall};`
)})`
])
: promises.length === 1
? Template.asString([
`${module.moduleArgument}.exports = Promise.resolve(${
promises[0]
}).then(${runtimeTemplate.basicFunction(
promises[0],
`${importsCompatCode}return ${instantiateCall};`
)})`
])
: `${importsCompatCode}${module.moduleArgument}.exports = ${instantiateCall}`
}`
);
return InitFragment.addToSource(source, initFragments, generateContext);
}
}
module.exports = AsyncWebAssemblyJavascriptGenerator;

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