mirror of https://github.com/webpack/webpack.git
83 lines
2.6 KiB
JavaScript
83 lines
2.6 KiB
JavaScript
/*
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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 RuntimeGlobals = require("../RuntimeGlobals");
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const RuntimeModule = require("../RuntimeModule");
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const Template = require("../Template");
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class AsyncWasmChunkLoadingRuntimeModule extends RuntimeModule {
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constructor({ generateLoadBinaryCode, supportsStreaming }) {
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super("wasm chunk loading", 10);
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this.generateLoadBinaryCode = generateLoadBinaryCode;
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this.supportsStreaming = supportsStreaming;
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}
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/**
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* @returns {string} runtime code
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*/
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generate() {
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const { compilation, chunk } = this;
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const { outputOptions } = compilation;
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const fn = RuntimeGlobals.instantiateWasm;
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const chunkModuleMaps = this.compilation.chunkGraph.getChunkModuleMaps(
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chunk,
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m => m.type.startsWith("webassembly"),
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true
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);
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const wasmModuleSrcPath = compilation.getPath(
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JSON.stringify(outputOptions.webassemblyModuleFilename),
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{
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hash: `" + ${RuntimeGlobals.getFullHash}() + "`,
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hashWithLength: length =>
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`" + ${RuntimeGlobals.getFullHash}}().slice(0, ${length}) + "`,
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module: {
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id: '" + wasmModuleId + "',
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hash: `" + ${JSON.stringify(chunkModuleMaps.hash)}[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 `" + ${JSON.stringify(shortChunkHashMap)}[wasmModuleId] + "`;
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}
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}
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}
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);
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return Template.asString([
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`${fn} = function(exports, wasmModuleId, importsObj) {`,
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Template.indent([
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`var req = ${this.generateLoadBinaryCode(wasmModuleSrcPath)};`,
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this.supportsStreaming
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? Template.asString([
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"if(typeof WebAssembly.instantiateStreaming === 'function') {",
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Template.indent([
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"return WebAssembly.instantiateStreaming(req, importsObj)",
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Template.indent([
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".then(function(res) { return Object.assign(exports, res.instance.exports); });"
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])
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]),
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"}"
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])
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: "// no support for streaming compilation",
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"return req",
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Template.indent([
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".then(function(x) { return x.arrayBuffer(); })",
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".then(function(bytes) { return WebAssembly.instantiate(bytes, importsObj); })",
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`.then(function(res) { return Object.assign(exports, res.instance.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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module.exports = AsyncWasmChunkLoadingRuntimeModule;
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