mirror of https://github.com/webpack/webpack.git
342 lines
10 KiB
JavaScript
342 lines
10 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 { STAGE_ADVANCED } = require("../OptimizationStages");
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const { intersect } = require("../util/SetHelpers");
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const {
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compareChunks,
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compareModulesByIdentifier
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} = require("../util/comparators");
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const createSchemaValidation = require("../util/create-schema-validation");
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const identifierUtils = require("../util/identifier");
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/** @typedef {import("../../declarations/plugins/optimize/AggressiveSplittingPlugin").AggressiveSplittingPluginOptions} AggressiveSplittingPluginOptions */
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/** @typedef {import("../Chunk")} Chunk */
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/** @typedef {import("../ChunkGraph")} ChunkGraph */
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/** @typedef {import("../Compiler")} Compiler */
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/** @typedef {import("../Module")} Module */
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const validate = createSchemaValidation(
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require("../../schemas/plugins/optimize/AggressiveSplittingPlugin.check"),
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() =>
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require("../../schemas/plugins/optimize/AggressiveSplittingPlugin.json"),
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{
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name: "Aggressive Splitting Plugin",
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baseDataPath: "options"
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}
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);
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/**
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* @param {ChunkGraph} chunkGraph the chunk graph
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* @param {Chunk} oldChunk the old chunk
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* @param {Chunk} newChunk the new chunk
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* @returns {(module: Module) => void} function to move module between chunks
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*/
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const moveModuleBetween = (chunkGraph, oldChunk, newChunk) => (module) => {
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chunkGraph.disconnectChunkAndModule(oldChunk, module);
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chunkGraph.connectChunkAndModule(newChunk, module);
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};
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/**
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* @param {ChunkGraph} chunkGraph the chunk graph
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* @param {Chunk} chunk the chunk
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* @returns {(module: Module) => boolean} filter for entry module
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*/
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const isNotAEntryModule = (chunkGraph, chunk) => (module) =>
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!chunkGraph.isEntryModuleInChunk(module, chunk);
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/** @typedef {{ id?: NonNullable<Chunk["id"]>, hash?: NonNullable<Chunk["hash"]>, modules: Module[], size: number }} SplitData */
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/** @type {WeakSet<Chunk>} */
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const recordedChunks = new WeakSet();
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const PLUGIN_NAME = "AggressiveSplittingPlugin";
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class AggressiveSplittingPlugin {
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/**
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* @param {AggressiveSplittingPluginOptions=} options options object
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*/
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constructor(options = {}) {
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validate(options);
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this.options = options;
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if (typeof this.options.minSize !== "number") {
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this.options.minSize = 30 * 1024;
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}
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if (typeof this.options.maxSize !== "number") {
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this.options.maxSize = 50 * 1024;
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}
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if (typeof this.options.chunkOverhead !== "number") {
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this.options.chunkOverhead = 0;
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}
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if (typeof this.options.entryChunkMultiplicator !== "number") {
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this.options.entryChunkMultiplicator = 1;
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}
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}
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/**
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* @param {Chunk} chunk the chunk to test
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* @returns {boolean} true if the chunk was recorded
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*/
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static wasChunkRecorded(chunk) {
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return recordedChunks.has(chunk);
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}
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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.thisCompilation.tap(PLUGIN_NAME, (compilation) => {
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let needAdditionalSeal = false;
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/** @type {SplitData[]} */
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let newSplits;
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/** @type {Set<Chunk>} */
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let fromAggressiveSplittingSet;
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/** @type {Map<Chunk, SplitData>} */
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let chunkSplitDataMap;
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compilation.hooks.optimize.tap(PLUGIN_NAME, () => {
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newSplits = [];
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fromAggressiveSplittingSet = new Set();
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chunkSplitDataMap = new Map();
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});
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compilation.hooks.optimizeChunks.tap(
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{
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name: PLUGIN_NAME,
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stage: STAGE_ADVANCED
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},
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(chunks) => {
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const chunkGraph = compilation.chunkGraph;
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// Precompute stuff
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const nameToModuleMap = new Map();
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const moduleToNameMap = new Map();
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const makePathsRelative =
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identifierUtils.makePathsRelative.bindContextCache(
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compiler.context,
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compiler.root
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);
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for (const m of compilation.modules) {
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const name = makePathsRelative(m.identifier());
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nameToModuleMap.set(name, m);
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moduleToNameMap.set(m, name);
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}
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// Check used chunk ids
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const usedIds = new Set();
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for (const chunk of chunks) {
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usedIds.add(chunk.id);
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}
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const recordedSplits =
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(compilation.records && compilation.records.aggressiveSplits) || [];
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const usedSplits = newSplits
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? [...recordedSplits, ...newSplits]
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: recordedSplits;
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const minSize = /** @type {number} */ (this.options.minSize);
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const maxSize = /** @type {number} */ (this.options.maxSize);
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/**
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* @param {SplitData} splitData split data
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* @returns {boolean} true when applied, otherwise false
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*/
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const applySplit = (splitData) => {
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// Cannot split if id is already taken
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if (splitData.id !== undefined && usedIds.has(splitData.id)) {
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return false;
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}
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// Get module objects from names
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const selectedModules = splitData.modules.map((name) =>
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nameToModuleMap.get(name)
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);
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// Does the modules exist at all?
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if (!selectedModules.every(Boolean)) return false;
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// Check if size matches (faster than waiting for hash)
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let size = 0;
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for (const m of selectedModules) size += m.size();
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if (size !== splitData.size) return false;
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// get chunks with all modules
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const selectedChunks = intersect(
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selectedModules.map(
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(m) => new Set(chunkGraph.getModuleChunksIterable(m))
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)
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);
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// No relevant chunks found
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if (selectedChunks.size === 0) return false;
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// The found chunk is already the split or similar
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if (
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selectedChunks.size === 1 &&
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chunkGraph.getNumberOfChunkModules([...selectedChunks][0]) ===
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selectedModules.length
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) {
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const chunk = [...selectedChunks][0];
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if (fromAggressiveSplittingSet.has(chunk)) return false;
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fromAggressiveSplittingSet.add(chunk);
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chunkSplitDataMap.set(chunk, splitData);
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return true;
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}
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// split the chunk into two parts
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const newChunk = compilation.addChunk();
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newChunk.chunkReason = "aggressive splitted";
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for (const chunk of selectedChunks) {
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for (const module of selectedModules) {
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moveModuleBetween(chunkGraph, chunk, newChunk)(module);
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}
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chunk.split(newChunk);
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chunk.name = null;
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}
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fromAggressiveSplittingSet.add(newChunk);
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chunkSplitDataMap.set(newChunk, splitData);
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if (splitData.id !== null && splitData.id !== undefined) {
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newChunk.id = splitData.id;
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newChunk.ids = [splitData.id];
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}
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return true;
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};
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// try to restore to recorded splitting
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let changed = false;
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for (let j = 0; j < usedSplits.length; j++) {
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const splitData = usedSplits[j];
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if (applySplit(splitData)) changed = true;
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}
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// for any chunk which isn't splitted yet, split it and create a new entry
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// start with the biggest chunk
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const cmpFn = compareChunks(chunkGraph);
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const sortedChunks = [...chunks].sort((a, b) => {
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const diff1 =
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chunkGraph.getChunkModulesSize(b) -
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chunkGraph.getChunkModulesSize(a);
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if (diff1) return diff1;
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const diff2 =
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chunkGraph.getNumberOfChunkModules(a) -
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chunkGraph.getNumberOfChunkModules(b);
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if (diff2) return diff2;
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return cmpFn(a, b);
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});
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for (const chunk of sortedChunks) {
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if (fromAggressiveSplittingSet.has(chunk)) continue;
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const size = chunkGraph.getChunkModulesSize(chunk);
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if (
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size > maxSize &&
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chunkGraph.getNumberOfChunkModules(chunk) > 1
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) {
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const modules = chunkGraph
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.getOrderedChunkModules(chunk, compareModulesByIdentifier)
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.filter(isNotAEntryModule(chunkGraph, chunk));
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const selectedModules = [];
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let selectedModulesSize = 0;
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for (let k = 0; k < modules.length; k++) {
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const module = modules[k];
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const newSize = selectedModulesSize + module.size();
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if (newSize > maxSize && selectedModulesSize >= minSize) {
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break;
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}
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selectedModulesSize = newSize;
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selectedModules.push(module);
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}
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if (selectedModules.length === 0) continue;
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/** @type {SplitData} */
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const splitData = {
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modules: selectedModules
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.map((m) => moduleToNameMap.get(m))
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.sort(),
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size: selectedModulesSize
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};
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if (applySplit(splitData)) {
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newSplits = [...(newSplits || []), splitData];
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changed = true;
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}
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}
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}
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if (changed) return true;
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}
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);
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compilation.hooks.recordHash.tap(PLUGIN_NAME, (records) => {
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// 4. save made splittings to records
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const allSplits = new Set();
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/** @type {Set<SplitData>} */
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const invalidSplits = new Set();
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// Check if some splittings are invalid
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// We remove invalid splittings and try again
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for (const chunk of compilation.chunks) {
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const splitData = chunkSplitDataMap.get(chunk);
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if (
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splitData !== undefined &&
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splitData.hash &&
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chunk.hash !== splitData.hash
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) {
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// Split was successful, but hash doesn't equal
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// We can throw away the split since it's useless now
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invalidSplits.add(splitData);
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}
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}
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if (invalidSplits.size > 0) {
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records.aggressiveSplits =
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/** @type {SplitData[]} */
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(records.aggressiveSplits).filter(
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(splitData) => !invalidSplits.has(splitData)
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);
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needAdditionalSeal = true;
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} else {
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// set hash and id values on all (new) splittings
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for (const chunk of compilation.chunks) {
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const splitData = chunkSplitDataMap.get(chunk);
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if (splitData !== undefined) {
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splitData.hash =
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/** @type {NonNullable<Chunk["hash"]>} */
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(chunk.hash);
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splitData.id =
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/** @type {NonNullable<Chunk["id"]>} */
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(chunk.id);
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allSplits.add(splitData);
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// set flag for stats
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recordedChunks.add(chunk);
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}
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}
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// Also add all unused historical splits (after the used ones)
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// They can still be used in some future compilation
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const recordedSplits =
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compilation.records && compilation.records.aggressiveSplits;
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if (recordedSplits) {
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for (const splitData of recordedSplits) {
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if (!invalidSplits.has(splitData)) allSplits.add(splitData);
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}
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}
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// record all splits
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records.aggressiveSplits = [...allSplits];
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needAdditionalSeal = false;
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}
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});
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compilation.hooks.needAdditionalSeal.tap(PLUGIN_NAME, () => {
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if (needAdditionalSeal) {
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needAdditionalSeal = false;
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return true;
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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 = AggressiveSplittingPlugin;
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