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AsyncWasmLoadingRuntimeModule.js
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Created: Tue, Jun 17, 01:50

AsyncWasmLoadingRuntimeModule.js
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	/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
	*/

	"use strict";

	const RuntimeGlobals = require("../RuntimeGlobals");
	const RuntimeModule = require("../RuntimeModule");
	const Template = require("../Template");

	class AsyncWasmLoadingRuntimeModule extends RuntimeModule {
	constructor({ generateLoadBinaryCode, supportsStreaming }) {
	super("wasm loading", RuntimeModule.STAGE_NORMAL);
	this.generateLoadBinaryCode = generateLoadBinaryCode;
	this.supportsStreaming = supportsStreaming;
	}

	/**
	* @returns {string} runtime code
	*/
	generate() {
	const { compilation, chunk } = this;
	const { outputOptions, runtimeTemplate } = compilation;
	const fn = RuntimeGlobals.instantiateWasm;
	const wasmModuleSrcPath = compilation.getPath(
	JSON.stringify(outputOptions.webassemblyModuleFilename),
	{
	hash: `" + ${RuntimeGlobals.getFullHash}() + "`,
	hashWithLength: length =>
	`" + ${RuntimeGlobals.getFullHash}}().slice(0, ${length}) + "`,
	module: {
	id: '" + wasmModuleId + "',
	hash: `" + wasmModuleHash + "`,
	hashWithLength(length) {
	return `" + wasmModuleHash.slice(0, ${length}) + "`;
	}
	},
	runtime: chunk.runtime
	}
	);
	return `${fn} = ${runtimeTemplate.basicFunction(
	"exports, wasmModuleId, wasmModuleHash, importsObj",
	[
	`var req = ${this.generateLoadBinaryCode(wasmModuleSrcPath)};`,
	this.supportsStreaming
	? Template.asString([
	"if (typeof WebAssembly.instantiateStreaming === 'function') {",
	Template.indent([
	"return WebAssembly.instantiateStreaming(req, importsObj)",
	Template.indent([
	`.then(${runtimeTemplate.returningFunction(
	"Object.assign(exports, res.instance.exports)",
	"res"
	)});`
	])
	]),
	"}"
	])
	: "// no support for streaming compilation",
	"return req",
	Template.indent([
	`.then(${runtimeTemplate.returningFunction("x.arrayBuffer()", "x")})`,
	`.then(${runtimeTemplate.returningFunction(
	"WebAssembly.instantiate(bytes, importsObj)",
	"bytes"
	)})`,
	`.then(${runtimeTemplate.returningFunction(
	"Object.assign(exports, res.instance.exports)",
	"res"
	)});`
	])
	]
	)};`;
	}
	}

	module.exports = AsyncWasmLoadingRuntimeModule;

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