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231 lines
7.4 KiB
231 lines
7.4 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 validateOptions = require("schema-utils");
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const schema = require("../../schemas/plugins/optimize/LimitChunkCountPlugin.json");
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const LazyBucketSortedSet = require("../util/LazyBucketSortedSet");
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/** @typedef {import("../../declarations/plugins/optimize/LimitChunkCountPlugin").LimitChunkCountPluginOptions} LimitChunkCountPluginOptions */
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/** @typedef {import("../Chunk")} Chunk */
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/** @typedef {import("../Compiler")} Compiler */
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/**
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* @typedef {Object} ChunkCombination
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* @property {boolean} deleted this is set to true when combination was removed
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* @property {number} sizeDiff
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* @property {number} integratedSize
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* @property {Chunk} a
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* @property {Chunk} b
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* @property {number} aIdx
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* @property {number} bIdx
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* @property {number} aSize
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* @property {number} bSize
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*/
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const addToSetMap = (map, key, value) => {
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const set = map.get(key);
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if (set === undefined) {
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map.set(key, new Set([value]));
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} else {
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set.add(value);
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}
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};
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class LimitChunkCountPlugin {
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/**
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* @param {LimitChunkCountPluginOptions=} options options object
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*/
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constructor(options) {
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if (!options) options = {};
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validateOptions(schema, options, "Limit Chunk Count Plugin");
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this.options = options;
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}
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/**
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* @param {Compiler} compiler the webpack compiler
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* @returns {void}
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*/
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apply(compiler) {
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const options = this.options;
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compiler.hooks.compilation.tap("LimitChunkCountPlugin", compilation => {
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compilation.hooks.optimizeChunksAdvanced.tap(
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"LimitChunkCountPlugin",
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chunks => {
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const maxChunks = options.maxChunks;
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if (!maxChunks) return;
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if (maxChunks < 1) return;
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if (chunks.length <= maxChunks) return;
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let remainingChunksToMerge = chunks.length - maxChunks;
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// order chunks in a deterministic way
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const orderedChunks = chunks.slice().sort((a, b) => a.compareTo(b));
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// create a lazy sorted data structure to keep all combinations
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// this is large. Size = chunks * (chunks - 1) / 2
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// It uses a multi layer bucket sort plus normal sort in the last layer
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// It's also lazy so only accessed buckets are sorted
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const combinations = new LazyBucketSortedSet(
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// Layer 1: ordered by largest size benefit
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c => c.sizeDiff,
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(a, b) => b - a,
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// Layer 2: ordered by smallest combined size
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c => c.integratedSize,
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(a, b) => a - b,
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// Layer 3: ordered by position difference in orderedChunk (-> to be deterministic)
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c => c.bIdx - c.aIdx,
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(a, b) => a - b,
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// Layer 4: ordered by position in orderedChunk (-> to be deterministic)
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(a, b) => a.bIdx - b.bIdx
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);
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// we keep a mappng from chunk to all combinations
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// but this mapping is not kept up-to-date with deletions
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// so `deleted` flag need to be considered when iterating this
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/** @type {Map<Chunk, Set<ChunkCombination>>} */
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const combinationsByChunk = new Map();
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orderedChunks.forEach((b, bIdx) => {
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// create combination pairs with size and integrated size
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for (let aIdx = 0; aIdx < bIdx; aIdx++) {
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const a = orderedChunks[aIdx];
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const integratedSize = a.integratedSize(b, options);
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// filter pairs that do not have an integratedSize
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// meaning they can NOT be integrated!
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if (integratedSize === false) continue;
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const aSize = a.size(options);
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const bSize = b.size(options);
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const c = {
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deleted: false,
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sizeDiff: aSize + bSize - integratedSize,
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integratedSize,
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a,
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b,
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aIdx,
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bIdx,
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aSize,
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bSize
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};
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combinations.add(c);
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addToSetMap(combinationsByChunk, a, c);
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addToSetMap(combinationsByChunk, b, c);
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}
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return combinations;
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});
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// list of modified chunks during this run
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// combinations affected by this change are skipped to allow
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// futher optimizations
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/** @type {Set<Chunk>} */
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const modifiedChunks = new Set();
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let changed = false;
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// eslint-disable-next-line no-constant-condition
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loop: while (true) {
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const combination = combinations.popFirst();
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if (combination === undefined) break;
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combination.deleted = true;
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const { a, b, integratedSize } = combination;
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// skip over pair when
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// one of the already merged chunks is a parent of one of the chunks
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if (modifiedChunks.size > 0) {
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const queue = new Set(a.groupsIterable);
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for (const group of b.groupsIterable) {
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queue.add(group);
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}
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for (const group of queue) {
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for (const mChunk of modifiedChunks) {
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if (mChunk !== a && mChunk !== b && mChunk.isInGroup(group)) {
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// This is a potential pair which needs recalculation
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// We can't do that now, but it merge before following pairs
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// so we leave space for it, and consider chunks as modified
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// just for the worse case
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remainingChunksToMerge--;
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if (remainingChunksToMerge <= 0) break loop;
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modifiedChunks.add(a);
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modifiedChunks.add(b);
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continue loop;
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}
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}
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for (const parent of group.parentsIterable) {
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queue.add(parent);
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}
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}
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}
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// merge the chunks
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if (a.integrate(b, "limit")) {
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chunks.splice(chunks.indexOf(b), 1);
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// flag chunk a as modified as further optimization are possible for all children here
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modifiedChunks.add(a);
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changed = true;
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remainingChunksToMerge--;
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if (remainingChunksToMerge <= 0) break;
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// Update all affected combinations
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// delete all combination with the removed chunk
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// we will use combinations with the kept chunk instead
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for (const combination of combinationsByChunk.get(b)) {
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if (combination.deleted) continue;
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combination.deleted = true;
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combinations.delete(combination);
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}
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// Update combinations with the kept chunk with new sizes
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for (const combination of combinationsByChunk.get(a)) {
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if (combination.deleted) continue;
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if (combination.a === a) {
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// Update size
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const newIntegratedSize = a.integratedSize(
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combination.b,
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options
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);
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if (newIntegratedSize === false) {
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combination.deleted = true;
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combinations.delete(combination);
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continue;
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}
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const finishUpdate = combinations.startUpdate(combination);
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combination.integratedSize = newIntegratedSize;
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combination.aSize = integratedSize;
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combination.sizeDiff =
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combination.bSize + integratedSize - newIntegratedSize;
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finishUpdate();
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} else if (combination.b === a) {
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// Update size
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const newIntegratedSize = combination.a.integratedSize(
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a,
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options
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);
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if (newIntegratedSize === false) {
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combination.deleted = true;
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combinations.delete(combination);
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continue;
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}
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const finishUpdate = combinations.startUpdate(combination);
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combination.integratedSize = newIntegratedSize;
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combination.bSize = integratedSize;
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combination.sizeDiff =
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integratedSize + combination.aSize - newIntegratedSize;
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finishUpdate();
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}
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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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});
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}
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}
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module.exports = LimitChunkCountPlugin;
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