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348 lines
11 KiB
348 lines
11 KiB
3 years ago
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/*
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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 Dependency = require("./Dependency");
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const { UsageState } = require("./ExportsInfo");
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const ModuleGraphConnection = require("./ModuleGraphConnection");
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const { STAGE_DEFAULT } = require("./OptimizationStages");
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const ArrayQueue = require("./util/ArrayQueue");
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const TupleQueue = require("./util/TupleQueue");
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const { getEntryRuntime, mergeRuntimeOwned } = require("./util/runtime");
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/** @typedef {import("./Chunk")} Chunk */
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/** @typedef {import("./ChunkGroup")} ChunkGroup */
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/** @typedef {import("./Compiler")} Compiler */
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/** @typedef {import("./DependenciesBlock")} DependenciesBlock */
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/** @typedef {import("./Dependency").ReferencedExport} ReferencedExport */
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/** @typedef {import("./ExportsInfo")} ExportsInfo */
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/** @typedef {import("./Module")} Module */
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/** @typedef {import("./util/runtime").RuntimeSpec} RuntimeSpec */
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const { NO_EXPORTS_REFERENCED, EXPORTS_OBJECT_REFERENCED } = Dependency;
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class FlagDependencyUsagePlugin {
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/**
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* @param {boolean} global do a global analysis instead of per runtime
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*/
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constructor(global) {
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this.global = global;
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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.compilation.tap("FlagDependencyUsagePlugin", compilation => {
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const moduleGraph = compilation.moduleGraph;
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compilation.hooks.optimizeDependencies.tap(
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{
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name: "FlagDependencyUsagePlugin",
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stage: STAGE_DEFAULT
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},
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modules => {
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if (compilation.moduleMemCaches) {
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throw new Error(
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"optimization.usedExports can't be used with cacheUnaffected as export usage is a global effect"
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);
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}
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const logger = compilation.getLogger(
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"webpack.FlagDependencyUsagePlugin"
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);
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/** @type {Map<ExportsInfo, Module>} */
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const exportInfoToModuleMap = new Map();
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/** @type {TupleQueue<[Module, RuntimeSpec]>} */
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const queue = new TupleQueue();
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/**
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* @param {Module} module module to process
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* @param {(string[] | ReferencedExport)[]} usedExports list of used exports
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* @param {RuntimeSpec} runtime part of which runtime
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* @param {boolean} forceSideEffects always apply side effects
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* @returns {void}
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*/
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const processReferencedModule = (
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module,
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usedExports,
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runtime,
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forceSideEffects
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) => {
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const exportsInfo = moduleGraph.getExportsInfo(module);
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if (usedExports.length > 0) {
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if (!module.buildMeta || !module.buildMeta.exportsType) {
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if (exportsInfo.setUsedWithoutInfo(runtime)) {
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queue.enqueue(module, runtime);
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}
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return;
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}
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for (const usedExportInfo of usedExports) {
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let usedExport;
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let canMangle = true;
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if (Array.isArray(usedExportInfo)) {
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usedExport = usedExportInfo;
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} else {
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usedExport = usedExportInfo.name;
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canMangle = usedExportInfo.canMangle !== false;
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}
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if (usedExport.length === 0) {
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if (exportsInfo.setUsedInUnknownWay(runtime)) {
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queue.enqueue(module, runtime);
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}
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} else {
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let currentExportsInfo = exportsInfo;
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for (let i = 0; i < usedExport.length; i++) {
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const exportInfo = currentExportsInfo.getExportInfo(
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usedExport[i]
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);
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if (canMangle === false) {
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exportInfo.canMangleUse = false;
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}
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const lastOne = i === usedExport.length - 1;
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if (!lastOne) {
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const nestedInfo = exportInfo.getNestedExportsInfo();
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if (nestedInfo) {
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if (
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exportInfo.setUsedConditionally(
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used => used === UsageState.Unused,
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UsageState.OnlyPropertiesUsed,
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runtime
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)
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) {
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const currentModule =
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currentExportsInfo === exportsInfo
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? module
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: exportInfoToModuleMap.get(currentExportsInfo);
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if (currentModule) {
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queue.enqueue(currentModule, runtime);
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}
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}
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currentExportsInfo = nestedInfo;
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continue;
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}
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}
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if (
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exportInfo.setUsedConditionally(
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v => v !== UsageState.Used,
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UsageState.Used,
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runtime
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)
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) {
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const currentModule =
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currentExportsInfo === exportsInfo
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? module
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: exportInfoToModuleMap.get(currentExportsInfo);
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if (currentModule) {
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queue.enqueue(currentModule, runtime);
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}
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}
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break;
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}
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}
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}
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} else {
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// for a module without side effects we stop tracking usage here when no export is used
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// This module won't be evaluated in this case
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// TODO webpack 6 remove this check
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if (
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!forceSideEffects &&
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module.factoryMeta !== undefined &&
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module.factoryMeta.sideEffectFree
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) {
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return;
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}
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if (exportsInfo.setUsedForSideEffectsOnly(runtime)) {
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queue.enqueue(module, runtime);
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}
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}
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};
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/**
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* @param {DependenciesBlock} module the module
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* @param {RuntimeSpec} runtime part of which runtime
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* @param {boolean} forceSideEffects always apply side effects
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* @returns {void}
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*/
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const processModule = (module, runtime, forceSideEffects) => {
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/** @type {Map<Module, (string[] | ReferencedExport)[] | Map<string, string[] | ReferencedExport>>} */
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const map = new Map();
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/** @type {ArrayQueue<DependenciesBlock>} */
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const queue = new ArrayQueue();
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queue.enqueue(module);
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for (;;) {
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const block = queue.dequeue();
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if (block === undefined) break;
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for (const b of block.blocks) {
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if (
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!this.global &&
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b.groupOptions &&
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b.groupOptions.entryOptions
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) {
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processModule(
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b,
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b.groupOptions.entryOptions.runtime || undefined,
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true
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);
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} else {
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queue.enqueue(b);
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}
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}
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for (const dep of block.dependencies) {
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const connection = moduleGraph.getConnection(dep);
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if (!connection || !connection.module) {
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continue;
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}
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const activeState = connection.getActiveState(runtime);
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if (activeState === false) continue;
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const { module } = connection;
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if (activeState === ModuleGraphConnection.TRANSITIVE_ONLY) {
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processModule(module, runtime, false);
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continue;
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}
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const oldReferencedExports = map.get(module);
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if (oldReferencedExports === EXPORTS_OBJECT_REFERENCED) {
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continue;
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}
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const referencedExports =
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compilation.getDependencyReferencedExports(dep, runtime);
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if (
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oldReferencedExports === undefined ||
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oldReferencedExports === NO_EXPORTS_REFERENCED ||
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referencedExports === EXPORTS_OBJECT_REFERENCED
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) {
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map.set(module, referencedExports);
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} else if (
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oldReferencedExports !== undefined &&
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referencedExports === NO_EXPORTS_REFERENCED
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) {
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continue;
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} else {
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let exportsMap;
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if (Array.isArray(oldReferencedExports)) {
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exportsMap = new Map();
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for (const item of oldReferencedExports) {
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if (Array.isArray(item)) {
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exportsMap.set(item.join("\n"), item);
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} else {
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exportsMap.set(item.name.join("\n"), item);
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}
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}
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map.set(module, exportsMap);
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} else {
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exportsMap = oldReferencedExports;
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}
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for (const item of referencedExports) {
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if (Array.isArray(item)) {
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const key = item.join("\n");
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const oldItem = exportsMap.get(key);
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if (oldItem === undefined) {
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exportsMap.set(key, item);
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}
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// if oldItem is already an array we have to do nothing
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// if oldItem is an ReferencedExport object, we don't have to do anything
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// as canMangle defaults to true for arrays
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} else {
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const key = item.name.join("\n");
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const oldItem = exportsMap.get(key);
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if (oldItem === undefined || Array.isArray(oldItem)) {
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exportsMap.set(key, item);
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} else {
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exportsMap.set(key, {
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name: item.name,
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canMangle: item.canMangle && oldItem.canMangle
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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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for (const [module, referencedExports] of map) {
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if (Array.isArray(referencedExports)) {
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processReferencedModule(
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module,
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referencedExports,
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runtime,
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forceSideEffects
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);
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} else {
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processReferencedModule(
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module,
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Array.from(referencedExports.values()),
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runtime,
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forceSideEffects
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);
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}
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}
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};
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logger.time("initialize exports usage");
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for (const module of modules) {
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const exportsInfo = moduleGraph.getExportsInfo(module);
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exportInfoToModuleMap.set(exportsInfo, module);
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exportsInfo.setHasUseInfo();
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}
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logger.timeEnd("initialize exports usage");
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logger.time("trace exports usage in graph");
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/**
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* @param {Dependency} dep dependency
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* @param {RuntimeSpec} runtime runtime
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*/
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const processEntryDependency = (dep, runtime) => {
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const module = moduleGraph.getModule(dep);
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if (module) {
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processReferencedModule(
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module,
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NO_EXPORTS_REFERENCED,
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runtime,
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true
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);
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}
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};
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/** @type {RuntimeSpec} */
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let globalRuntime = undefined;
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for (const [
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entryName,
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{ dependencies: deps, includeDependencies: includeDeps, options }
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] of compilation.entries) {
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const runtime = this.global
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? undefined
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: getEntryRuntime(compilation, entryName, options);
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for (const dep of deps) {
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processEntryDependency(dep, runtime);
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}
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for (const dep of includeDeps) {
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processEntryDependency(dep, runtime);
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}
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globalRuntime = mergeRuntimeOwned(globalRuntime, runtime);
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}
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for (const dep of compilation.globalEntry.dependencies) {
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processEntryDependency(dep, globalRuntime);
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}
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for (const dep of compilation.globalEntry.includeDependencies) {
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processEntryDependency(dep, globalRuntime);
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}
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while (queue.length) {
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const [module, runtime] = queue.dequeue();
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processModule(module, runtime, false);
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}
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logger.timeEnd("trace exports usage in graph");
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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 = FlagDependencyUsagePlugin;
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