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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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