mirror of https://github.com/webpack/webpack.git
293 lines
9.4 KiB
JavaScript
293 lines
9.4 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 HarmonyImportDependency = require("../dependencies/HarmonyImportDependency");
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const ConcatenatedModule = require("./ConcatenatedModule");
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const HarmonyExportImportedSpecifierDependency = require("../dependencies/HarmonyExportImportedSpecifierDependency");
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class ModuleConcatenationPlugin {
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constructor(options) {
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if(typeof options !== "object") options = {};
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this.options = options;
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}
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apply(compiler) {
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compiler.plugin("compilation", (compilation, params) => {
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params.normalModuleFactory.plugin("parser", (parser, parserOptions) => {
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parser.plugin("call eval", () => {
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parser.state.module.meta.hasEval = true;
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});
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});
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const bailoutReasonMap = new Map();
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function setBailoutReason(module, reason) {
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bailoutReasonMap.set(module, reason);
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module.optimizationBailout.push(reason);
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}
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function getBailoutReason(module, requestShortener) {
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const reason = bailoutReasonMap.get(module);
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if(typeof reason === "function") return reason(requestShortener);
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return reason;
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}
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compilation.plugin("optimize-chunk-modules", (chunks, modules) => {
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chunks.forEach(chunk => {
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const relevantModules = [];
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const possibleInners = new Set();
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for(const module of chunk.modulesIterable) {
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// Only harmony modules are valid for optimization
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if(!module.meta || !module.meta.harmonyModule) {
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continue;
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}
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// Module must not be in other chunks
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// TODO add an option to allow module to be in other entry points
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if(module.getNumberOfChunks() !== 1) {
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setBailoutReason(module, "ModuleConcatenation: module is in multiple chunks");
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continue;
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}
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// Because of variable renaming we can't use modules with eval
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if(module.meta && module.meta.hasEval) {
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setBailoutReason(module, "ModuleConcatenation: eval is used in the module");
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continue;
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}
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relevantModules.push(module);
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// Module must not be the entry points
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if(chunk.entryModule === module) {
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setBailoutReason(module, "ModuleConcatenation (inner): module is an entrypoint");
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continue;
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}
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// Exports must be known (and not dynamic)
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if(!Array.isArray(module.providedExports)) {
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setBailoutReason(module, "ModuleConcatenation (inner): exports are not known");
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continue;
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}
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// Using dependency variables is not possible as this wraps the code in a function
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if(module.variables.length > 0) {
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setBailoutReason(module, "ModuleConcatenation (inner): dependency variables are used (i. e. ProvidePlugin)");
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continue;
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}
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// Module must only be used by Harmony Imports
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const nonHarmonyReasons = module.reasons.filter(reason => !(reason.dependency instanceof HarmonyImportDependency));
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if(nonHarmonyReasons.length > 0) {
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const importingModules = new Set(nonHarmonyReasons.map(r => r.module));
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setBailoutReason(module, (requestShortener) => {
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const names = Array.from(importingModules).map(m => m.readableIdentifier(requestShortener));
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return `ModuleConcatenation (inner): module is used with non-harmony imports from ${names.join(", ")}`;
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});
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continue;
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}
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possibleInners.add(module);
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}
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// sort by depth
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// modules with lower depth are more likly suited as roots
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// this improves performance, because modules already selected as inner are skipped
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relevantModules.sort((a, b) => {
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return a.depth - b.depth;
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});
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const concatConfigurations = [];
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const usedAsInner = new Set();
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for(const currentRoot of relevantModules) {
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// when used by another configuration as inner:
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// the other configuration is better and we can skip this one
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if(usedAsInner.has(currentRoot))
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continue;
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// create a configuration with the root
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const currentConfiguration = new ConcatConfiguration(currentRoot);
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// cache failures to add modules
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const failureCache = new Map();
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// try to add all imports
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for(const imp of this.getImports(currentRoot)) {
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const problem = this.tryToAdd(currentConfiguration, imp, possibleInners, failureCache);
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if(problem) {
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failureCache.set(imp, problem);
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currentConfiguration.addWarning(imp, problem);
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}
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}
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if(!currentConfiguration.isEmpty()) {
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concatConfigurations.push(currentConfiguration);
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for(const module of currentConfiguration.modules) {
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if(module !== currentConfiguration.rootModule)
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usedAsInner.add(module);
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}
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}
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}
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// HACK: Sort configurations by length and start with the longest one
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// to get the biggers groups possible. Used modules are marked with usedModules
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// TODO: Allow to reuse existing configuration while trying to add dependencies.
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// This would improve performance. O(n^2) -> O(n)
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concatConfigurations.sort((a, b) => {
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return b.modules.size - a.modules.size;
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});
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const usedModules = new Set();
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for(const concatConfiguration of concatConfigurations) {
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if(usedModules.has(concatConfiguration.rootModule))
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continue;
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const orderedModules = new Set();
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this.addInOrder(concatConfiguration.rootModule, concatConfiguration.modules, orderedModules);
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const newModule = new ConcatenatedModule(concatConfiguration.rootModule, Array.from(orderedModules));
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for(const warning of concatConfiguration.warnings) {
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newModule.optimizationBailout.push((requestShortener) => {
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const reason = getBailoutReason(warning[0], requestShortener);
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const reasonPrefix = reason ? `: ${reason}` : "";
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if(warning[0] === warning[1])
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return `ModuleConcatenation: Cannot concat with ${warning[0].readableIdentifier(requestShortener)}${reasonPrefix}`;
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else
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return `ModuleConcatenation: Cannot concat with ${warning[0].readableIdentifier(requestShortener)} because of ${warning[1].readableIdentifier(requestShortener)}${reasonPrefix}`;
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});
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}
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for(const m of orderedModules) {
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usedModules.add(m);
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chunk.removeModule(m);
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}
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chunk.addModule(newModule);
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compilation.modules.push(newModule);
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if(chunk.entryModule === concatConfiguration.rootModule)
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chunk.entryModule = newModule;
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newModule.reasons.forEach(reason => reason.dependency.module = newModule);
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newModule.dependencies.forEach(dep => {
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if(dep.module) {
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dep.module.reasons.forEach(reason => {
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if(reason.dependency === dep)
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reason.module = newModule;
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});
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}
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});
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}
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compilation.modules = compilation.modules.filter(m => !usedModules.has(m));
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});
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});
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});
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}
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getImports(module) {
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return Array.from(new Set(module.dependencies
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// Only harmony Dependencies
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.filter(dep => dep instanceof HarmonyImportDependency && dep.module)
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// Dependencies are simple enough to concat them
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.filter(dep => {
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return !module.dependencies.some(d =>
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d instanceof HarmonyExportImportedSpecifierDependency &&
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d.importDependency === dep &&
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!d.id &&
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!Array.isArray(dep.module.providedExports)
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);
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})
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// Take the imported module
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.map(dep => dep.module)
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));
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}
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tryToAdd(config, module, possibleModules, failureCache) {
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const cacheEntry = failureCache.get(module);
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if(cacheEntry) {
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return cacheEntry;
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}
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// Already added?
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if(config.has(module)) {
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return null;
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}
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// Not possible to add?
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if(!possibleModules.has(module)) {
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return module;
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}
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// Clone config to make experimental changes
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const testConfig = config.clone();
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// Add the module
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testConfig.add(module);
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// Every module which depends on the added module must be in the configuration too.
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for(const reason of module.reasons) {
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const problem = this.tryToAdd(testConfig, reason.module, possibleModules, failureCache);
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if(problem) {
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failureCache.set(module, problem); // cache failures for performance
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return problem;
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}
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}
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// Eagerly try to add imports too if possible
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for(const imp of this.getImports(module)) {
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const problem = this.tryToAdd(testConfig, imp, possibleModules, failureCache);
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if(problem) {
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config.addWarning(module, problem);
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}
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}
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// Commit experimental changes
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config.set(testConfig);
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return null;
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}
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addInOrder(module, unorderedSet, orderedSet) {
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if(orderedSet.has(module)) return;
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if(!unorderedSet.has(module)) return;
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orderedSet.add(module);
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for(const imp of this.getImports(module))
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this.addInOrder(imp, unorderedSet, orderedSet);
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orderedSet.delete(module);
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orderedSet.add(module);
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}
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}
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class ConcatConfiguration {
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constructor(rootModule) {
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this.rootModule = rootModule;
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this.modules = new Set([rootModule]);
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this.warnings = new Map();
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}
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add(module) {
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this.modules.add(module);
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}
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has(module) {
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return this.modules.has(module);
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}
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isEmpty() {
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return this.modules.size === 1;
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}
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addWarning(module, problem) {
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this.warnings.set(module, problem);
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}
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clone() {
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const clone = new ConcatConfiguration(this.rootModule);
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for(const module of this.modules)
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clone.add(module);
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for(const pair of this.warnings)
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clone.addWarning(pair[0], pair[1]);
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return clone;
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}
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set(config) {
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this.rootModule = config.rootModule;
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this.modules = new Set(config.modules);
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this.warnings = new Map(config.warnings);
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}
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}
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module.exports = ModuleConcatenationPlugin;
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