mirror of https://github.com/webpack/webpack.git
406 lines
13 KiB
JavaScript
406 lines
13 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 asyncLib = require("neo-async");
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const Queue = require("./util/Queue");
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/** @typedef {import("./Compiler")} Compiler */
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/** @typedef {import("./DependenciesBlock")} DependenciesBlock */
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/** @typedef {import("./Dependency")} Dependency */
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/** @typedef {import("./Dependency").ExportSpec} ExportSpec */
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/** @typedef {import("./Dependency").ExportsSpec} ExportsSpec */
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/** @typedef {import("./ExportsInfo")} ExportsInfo */
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/** @typedef {import("./Module")} Module */
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const PLUGIN_NAME = "FlagDependencyExportsPlugin";
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const PLUGIN_LOGGER_NAME = `webpack.${PLUGIN_NAME}`;
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class FlagDependencyExportsPlugin {
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/**
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* Apply the plugin
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* @param {Compiler} compiler the compiler instance
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* @returns {void}
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*/
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apply(compiler) {
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compiler.hooks.compilation.tap(PLUGIN_NAME, compilation => {
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const moduleGraph = compilation.moduleGraph;
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const cache = compilation.getCache(PLUGIN_NAME);
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compilation.hooks.finishModules.tapAsync(
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PLUGIN_NAME,
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(modules, callback) => {
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const logger = compilation.getLogger(PLUGIN_LOGGER_NAME);
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let statRestoredFromMemCache = 0;
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let statRestoredFromCache = 0;
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let statNoExports = 0;
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let statFlaggedUncached = 0;
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let statNotCached = 0;
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let statQueueItemsProcessed = 0;
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const { moduleMemCaches } = compilation;
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/** @type {Queue<Module>} */
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const queue = new Queue();
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// Step 1: Try to restore cached provided export info from cache
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logger.time("restore cached provided exports");
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asyncLib.each(
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modules,
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(module, callback) => {
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const exportsInfo = moduleGraph.getExportsInfo(module);
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// If the module doesn't have an exportsType, it's a module
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// without declared exports.
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if (!module.buildMeta || !module.buildMeta.exportsType) {
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if (exportsInfo.otherExportsInfo.provided !== null) {
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// It's a module without declared exports
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statNoExports++;
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exportsInfo.setHasProvideInfo();
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exportsInfo.setUnknownExportsProvided();
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return callback();
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}
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}
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// If the module has no hash, it's uncacheable
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if (typeof module.buildInfo.hash !== "string") {
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statFlaggedUncached++;
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// Enqueue uncacheable module for determining the exports
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queue.enqueue(module);
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exportsInfo.setHasProvideInfo();
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return callback();
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}
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const memCache = moduleMemCaches && moduleMemCaches.get(module);
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const memCacheValue = memCache && memCache.get(this);
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if (memCacheValue !== undefined) {
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statRestoredFromMemCache++;
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exportsInfo.restoreProvided(memCacheValue);
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return callback();
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}
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cache.get(
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module.identifier(),
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module.buildInfo.hash,
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(err, result) => {
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if (err) return callback(err);
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if (result !== undefined) {
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statRestoredFromCache++;
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exportsInfo.restoreProvided(result);
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} else {
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statNotCached++;
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// Without cached info enqueue module for determining the exports
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queue.enqueue(module);
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exportsInfo.setHasProvideInfo();
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}
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callback();
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}
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);
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},
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err => {
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logger.timeEnd("restore cached provided exports");
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if (err) return callback(err);
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/** @type {Set<Module>} */
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const modulesToStore = new Set();
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/** @type {Map<Module, Set<Module>>} */
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const dependencies = new Map();
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/** @type {Module} */
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let module;
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/** @type {ExportsInfo} */
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let exportsInfo;
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/** @type {Map<Dependency, ExportsSpec>} */
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const exportsSpecsFromDependencies = new Map();
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let cacheable = true;
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let changed = false;
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/**
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* @param {DependenciesBlock} depBlock the dependencies block
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* @returns {void}
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*/
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const processDependenciesBlock = depBlock => {
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for (const dep of depBlock.dependencies) {
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processDependency(dep);
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}
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for (const block of depBlock.blocks) {
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processDependenciesBlock(block);
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}
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};
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/**
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* @param {Dependency} dep the dependency
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* @returns {void}
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*/
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const processDependency = dep => {
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const exportDesc = dep.getExports(moduleGraph);
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if (!exportDesc) return;
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exportsSpecsFromDependencies.set(dep, exportDesc);
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};
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/**
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* @param {Dependency} dep dependency
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* @param {ExportsSpec} exportDesc info
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* @returns {void}
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*/
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const processExportsSpec = (dep, exportDesc) => {
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const exports = exportDesc.exports;
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const globalCanMangle = exportDesc.canMangle;
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const globalFrom = exportDesc.from;
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const globalPriority = exportDesc.priority;
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const globalTerminalBinding =
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exportDesc.terminalBinding || false;
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const exportDeps = exportDesc.dependencies;
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if (exportDesc.hideExports) {
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for (const name of exportDesc.hideExports) {
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const exportInfo = exportsInfo.getExportInfo(name);
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exportInfo.unsetTarget(dep);
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}
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}
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if (exports === true) {
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// unknown exports
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if (
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exportsInfo.setUnknownExportsProvided(
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globalCanMangle,
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exportDesc.excludeExports,
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globalFrom && dep,
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globalFrom,
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globalPriority
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)
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) {
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changed = true;
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}
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} else if (Array.isArray(exports)) {
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/**
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* merge in new exports
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* @param {ExportsInfo} exportsInfo own exports info
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* @param {(ExportSpec | string)[]} exports list of exports
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*/
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const mergeExports = (exportsInfo, exports) => {
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for (const exportNameOrSpec of exports) {
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let name;
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let canMangle = globalCanMangle;
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let terminalBinding = globalTerminalBinding;
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let exports = undefined;
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let from = globalFrom;
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let fromExport = undefined;
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let priority = globalPriority;
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let hidden = false;
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if (typeof exportNameOrSpec === "string") {
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name = exportNameOrSpec;
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} else {
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name = exportNameOrSpec.name;
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if (exportNameOrSpec.canMangle !== undefined)
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canMangle = exportNameOrSpec.canMangle;
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if (exportNameOrSpec.export !== undefined)
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fromExport = exportNameOrSpec.export;
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if (exportNameOrSpec.exports !== undefined)
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exports = exportNameOrSpec.exports;
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if (exportNameOrSpec.from !== undefined)
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from = exportNameOrSpec.from;
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if (exportNameOrSpec.priority !== undefined)
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priority = exportNameOrSpec.priority;
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if (exportNameOrSpec.terminalBinding !== undefined)
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terminalBinding = exportNameOrSpec.terminalBinding;
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if (exportNameOrSpec.hidden !== undefined)
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hidden = exportNameOrSpec.hidden;
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}
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const exportInfo = exportsInfo.getExportInfo(name);
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if (
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exportInfo.provided === false ||
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exportInfo.provided === null
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) {
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exportInfo.provided = true;
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changed = true;
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}
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if (
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exportInfo.canMangleProvide !== false &&
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canMangle === false
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) {
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exportInfo.canMangleProvide = false;
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changed = true;
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}
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if (terminalBinding && !exportInfo.terminalBinding) {
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exportInfo.terminalBinding = true;
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changed = true;
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}
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if (exports) {
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const nestedExportsInfo =
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exportInfo.createNestedExportsInfo();
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mergeExports(nestedExportsInfo, exports);
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}
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if (
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from &&
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(hidden
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? exportInfo.unsetTarget(dep)
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: exportInfo.setTarget(
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dep,
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from,
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fromExport === undefined ? [name] : fromExport,
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priority
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))
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) {
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changed = true;
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}
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// Recalculate target exportsInfo
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const target = exportInfo.getTarget(moduleGraph);
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let targetExportsInfo = undefined;
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if (target) {
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const targetModuleExportsInfo =
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moduleGraph.getExportsInfo(target.module);
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targetExportsInfo =
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targetModuleExportsInfo.getNestedExportsInfo(
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target.export
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);
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// add dependency for this module
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const set = dependencies.get(target.module);
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if (set === undefined) {
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dependencies.set(target.module, new Set([module]));
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} else {
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set.add(module);
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}
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}
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if (exportInfo.exportsInfoOwned) {
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if (
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exportInfo.exportsInfo.setRedirectNamedTo(
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targetExportsInfo
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)
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) {
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changed = true;
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}
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} else if (exportInfo.exportsInfo !== targetExportsInfo) {
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exportInfo.exportsInfo = targetExportsInfo;
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changed = true;
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}
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}
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};
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mergeExports(exportsInfo, exports);
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}
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// store dependencies
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if (exportDeps) {
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cacheable = false;
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for (const exportDependency of exportDeps) {
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// add dependency for this module
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const set = dependencies.get(exportDependency);
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if (set === undefined) {
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dependencies.set(exportDependency, new Set([module]));
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} else {
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set.add(module);
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}
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}
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}
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};
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const notifyDependencies = () => {
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const deps = dependencies.get(module);
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if (deps !== undefined) {
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for (const dep of deps) {
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queue.enqueue(dep);
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}
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}
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};
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logger.time("figure out provided exports");
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while (queue.length > 0) {
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module = queue.dequeue();
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statQueueItemsProcessed++;
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exportsInfo = moduleGraph.getExportsInfo(module);
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cacheable = true;
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changed = false;
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exportsSpecsFromDependencies.clear();
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moduleGraph.freeze();
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processDependenciesBlock(module);
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moduleGraph.unfreeze();
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for (const [dep, exportsSpec] of exportsSpecsFromDependencies) {
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processExportsSpec(dep, exportsSpec);
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}
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if (cacheable) {
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modulesToStore.add(module);
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}
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if (changed) {
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notifyDependencies();
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}
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}
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logger.timeEnd("figure out provided exports");
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logger.log(
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`${Math.round(
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(100 * (statFlaggedUncached + statNotCached)) /
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(statRestoredFromMemCache +
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statRestoredFromCache +
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statNotCached +
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statFlaggedUncached +
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statNoExports)
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)}% of exports of modules have been determined (${statNoExports} no declared exports, ${statNotCached} not cached, ${statFlaggedUncached} flagged uncacheable, ${statRestoredFromCache} from cache, ${statRestoredFromMemCache} from mem cache, ${
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statQueueItemsProcessed - statNotCached - statFlaggedUncached
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} additional calculations due to dependencies)`
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);
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logger.time("store provided exports into cache");
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asyncLib.each(
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modulesToStore,
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(module, callback) => {
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if (typeof module.buildInfo.hash !== "string") {
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// not cacheable
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return callback();
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}
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const cachedData = moduleGraph
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.getExportsInfo(module)
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.getRestoreProvidedData();
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const memCache =
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moduleMemCaches && moduleMemCaches.get(module);
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if (memCache) {
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memCache.set(this, cachedData);
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}
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cache.store(
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module.identifier(),
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module.buildInfo.hash,
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cachedData,
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callback
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);
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},
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err => {
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logger.timeEnd("store provided exports into cache");
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callback(err);
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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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/** @type {WeakMap<Module, any>} */
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const providedExportsCache = new WeakMap();
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compilation.hooks.rebuildModule.tap(PLUGIN_NAME, module => {
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providedExportsCache.set(
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module,
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moduleGraph.getExportsInfo(module).getRestoreProvidedData()
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);
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});
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compilation.hooks.finishRebuildingModule.tap(PLUGIN_NAME, module => {
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moduleGraph
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.getExportsInfo(module)
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.restoreProvided(providedExportsCache.get(module));
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});
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});
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}
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}
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module.exports = FlagDependencyExportsPlugin;
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