Modules.java revision 4107:98108b7d4cb6 
1/*
2 * Copyright (c) 2009, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26
27package com.sun.tools.javac.comp;
28
29import java.io.IOException;
30import java.util.Arrays;
31import java.util.Collection;
32import java.util.Collections;
33import java.util.EnumSet;
34import java.util.HashMap;
35import java.util.HashSet;
36import java.util.LinkedHashMap;
37import java.util.LinkedHashSet;
38import java.util.Map;
39import java.util.Set;
40import java.util.function.Consumer;
41import java.util.function.Predicate;
42import java.util.regex.Matcher;
43import java.util.regex.Pattern;
44import java.util.stream.Collectors;
45import java.util.stream.Stream;
46
47import javax.lang.model.SourceVersion;
48import javax.tools.JavaFileManager;
49import javax.tools.JavaFileManager.Location;
50import javax.tools.JavaFileObject;
51import javax.tools.JavaFileObject.Kind;
52import javax.tools.StandardLocation;
53
54import com.sun.source.tree.ModuleTree.ModuleKind;
55import com.sun.tools.javac.code.ClassFinder;
56import com.sun.tools.javac.code.DeferredLintHandler;
57import com.sun.tools.javac.code.Directive;
58import com.sun.tools.javac.code.Directive.ExportsDirective;
59import com.sun.tools.javac.code.Directive.ExportsFlag;
60import com.sun.tools.javac.code.Directive.OpensDirective;
61import com.sun.tools.javac.code.Directive.OpensFlag;
62import com.sun.tools.javac.code.Directive.RequiresDirective;
63import com.sun.tools.javac.code.Directive.RequiresFlag;
64import com.sun.tools.javac.code.Directive.UsesDirective;
65import com.sun.tools.javac.code.Flags;
66import com.sun.tools.javac.code.Lint.LintCategory;
67import com.sun.tools.javac.code.ModuleFinder;
68import com.sun.tools.javac.code.Source;
69import com.sun.tools.javac.code.Symbol;
70import com.sun.tools.javac.code.Symbol.ClassSymbol;
71import com.sun.tools.javac.code.Symbol.Completer;
72import com.sun.tools.javac.code.Symbol.CompletionFailure;
73import com.sun.tools.javac.code.Symbol.MethodSymbol;
74import com.sun.tools.javac.code.Symbol.ModuleFlags;
75import com.sun.tools.javac.code.Symbol.ModuleSymbol;
76import com.sun.tools.javac.code.Symbol.PackageSymbol;
77import com.sun.tools.javac.code.Symtab;
78import com.sun.tools.javac.code.Type;
79import com.sun.tools.javac.code.Types;
80import com.sun.tools.javac.jvm.ClassWriter;
81import com.sun.tools.javac.jvm.JNIWriter;
82import com.sun.tools.javac.main.Option;
83import com.sun.tools.javac.resources.CompilerProperties.Errors;
84import com.sun.tools.javac.resources.CompilerProperties.Warnings;
85import com.sun.tools.javac.tree.JCTree;
86import com.sun.tools.javac.tree.JCTree.JCCompilationUnit;
87import com.sun.tools.javac.tree.JCTree.JCDirective;
88import com.sun.tools.javac.tree.JCTree.JCExports;
89import com.sun.tools.javac.tree.JCTree.JCExpression;
90import com.sun.tools.javac.tree.JCTree.JCModuleDecl;
91import com.sun.tools.javac.tree.JCTree.JCOpens;
92import com.sun.tools.javac.tree.JCTree.JCProvides;
93import com.sun.tools.javac.tree.JCTree.JCRequires;
94import com.sun.tools.javac.tree.JCTree.JCUses;
95import com.sun.tools.javac.tree.JCTree.Tag;
96import com.sun.tools.javac.tree.TreeInfo;
97import com.sun.tools.javac.util.Abort;
98import com.sun.tools.javac.util.Assert;
99import com.sun.tools.javac.util.Context;
100import com.sun.tools.javac.util.JCDiagnostic;
101import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
102import com.sun.tools.javac.util.List;
103import com.sun.tools.javac.util.ListBuffer;
104import com.sun.tools.javac.util.Log;
105import com.sun.tools.javac.util.Name;
106import com.sun.tools.javac.util.Names;
107import com.sun.tools.javac.util.Options;
108import com.sun.tools.javac.util.Position;
109
110import static com.sun.tools.javac.code.Flags.ABSTRACT;
111import static com.sun.tools.javac.code.Flags.ENUM;
112import static com.sun.tools.javac.code.Flags.PUBLIC;
113import static com.sun.tools.javac.code.Flags.UNATTRIBUTED;
114import com.sun.tools.javac.code.Kinds;
115import static com.sun.tools.javac.code.Kinds.Kind.ERR;
116import static com.sun.tools.javac.code.Kinds.Kind.MDL;
117import static com.sun.tools.javac.code.Kinds.Kind.MTH;
118import com.sun.tools.javac.code.Symbol.ModuleResolutionFlags;
119import static com.sun.tools.javac.code.TypeTag.CLASS;
120
121/**
122 *  TODO: fill in
123 *
124 *  <p><b>This is NOT part of any supported API.
125 *  If you write code that depends on this, you do so at your own risk.
126 *  This code and its internal interfaces are subject to change or
127 *  deletion without notice.</b>
128 */
129public class Modules extends JCTree.Visitor {
130    private static final String ALL_SYSTEM = "ALL-SYSTEM";
131    private static final String ALL_MODULE_PATH = "ALL-MODULE-PATH";
132
133    private final Log log;
134    private final Names names;
135    private final Symtab syms;
136    private final Attr attr;
137    private final Check chk;
138    private final DeferredLintHandler deferredLintHandler;
139    private final TypeEnvs typeEnvs;
140    private final Types types;
141    private final JavaFileManager fileManager;
142    private final ModuleFinder moduleFinder;
143    private final Source source;
144    private final boolean allowModules;
145
146    public final boolean multiModuleMode;
147
148    private final String legacyModuleOverride;
149
150    private final Name java_se;
151    private final Name java_;
152
153    ModuleSymbol defaultModule;
154
155    private final String addExportsOpt;
156    private Map<ModuleSymbol, Set<ExportsDirective>> addExports;
157    private final String addReadsOpt;
158    private Map<ModuleSymbol, Set<RequiresDirective>> addReads;
159    private final String addModsOpt;
160    private final Set<String> extraAddMods = new HashSet<>();
161    private final String limitModsOpt;
162    private final Set<String> extraLimitMods = new HashSet<>();
163    private final String moduleVersionOpt;
164
165    private final boolean lintOptions;
166
167    private Set<ModuleSymbol> rootModules = null;
168    private final Set<ModuleSymbol> warnedMissing = new HashSet<>();
169
170    public PackageNameFinder findPackageInFile;
171
172    public static Modules instance(Context context) {
173        Modules instance = context.get(Modules.class);
174        if (instance == null)
175            instance = new Modules(context);
176        return instance;
177    }
178
179    protected Modules(Context context) {
180        context.put(Modules.class, this);
181        log = Log.instance(context);
182        names = Names.instance(context);
183        syms = Symtab.instance(context);
184        attr = Attr.instance(context);
185        chk = Check.instance(context);
186        deferredLintHandler = DeferredLintHandler.instance(context);
187        typeEnvs = TypeEnvs.instance(context);
188        moduleFinder = ModuleFinder.instance(context);
189        types = Types.instance(context);
190        fileManager = context.get(JavaFileManager.class);
191        source = Source.instance(context);
192        allowModules = source.allowModules();
193        Options options = Options.instance(context);
194
195        lintOptions = options.isUnset(Option.XLINT_CUSTOM, "-" + LintCategory.OPTIONS.option);
196
197        legacyModuleOverride = options.get(Option.XMODULE);
198
199        multiModuleMode = fileManager.hasLocation(StandardLocation.MODULE_SOURCE_PATH);
200        ClassWriter classWriter = ClassWriter.instance(context);
201        classWriter.multiModuleMode = multiModuleMode;
202        JNIWriter jniWriter = JNIWriter.instance(context);
203        jniWriter.multiModuleMode = multiModuleMode;
204
205        java_se = names.fromString("java.se");
206        java_ = names.fromString("java.");
207
208        addExportsOpt = options.get(Option.ADD_EXPORTS);
209        addReadsOpt = options.get(Option.ADD_READS);
210        addModsOpt = options.get(Option.ADD_MODULES);
211        limitModsOpt = options.get(Option.LIMIT_MODULES);
212        moduleVersionOpt = options.get(Option.MODULE_VERSION);
213    }
214
215    int depth = -1;
216    private void dprintln(String msg) {
217        for (int i = 0; i < depth; i++)
218            System.err.print("  ");
219        System.err.println(msg);
220    }
221
222    public void addExtraAddModules(String... extras) {
223        extraAddMods.addAll(Arrays.asList(extras));
224    }
225
226    public void addExtraLimitModules(String... extras) {
227        extraLimitMods.addAll(Arrays.asList(extras));
228    }
229
230    boolean inInitModules;
231    public void initModules(List<JCCompilationUnit> trees) {
232        Assert.check(!inInitModules);
233        try {
234            inInitModules = true;
235            Assert.checkNull(rootModules);
236            enter(trees, modules -> {
237                Assert.checkNull(rootModules);
238                Assert.checkNull(allModules);
239                this.rootModules = modules;
240                setupAllModules(); //initialize the module graph
241                Assert.checkNonNull(allModules);
242                inInitModules = false;
243            }, null);
244        } finally {
245            inInitModules = false;
246        }
247    }
248
249    public boolean enter(List<JCCompilationUnit> trees, ClassSymbol c) {
250        Assert.check(rootModules != null || inInitModules || !allowModules);
251        return enter(trees, modules -> {}, c);
252    }
253
254    private boolean enter(List<JCCompilationUnit> trees, Consumer<Set<ModuleSymbol>> init, ClassSymbol c) {
255        if (!allowModules) {
256            for (JCCompilationUnit tree: trees) {
257                tree.modle = syms.noModule;
258            }
259            defaultModule = syms.noModule;
260            return true;
261        }
262
263        int startErrors = log.nerrors;
264
265        depth++;
266        try {
267            // scan trees for module defs
268            Set<ModuleSymbol> roots = enterModules(trees, c);
269
270            setCompilationUnitModules(trees, roots, c);
271
272            init.accept(roots);
273
274            for (ModuleSymbol msym: roots) {
275                msym.complete();
276            }
277        } catch (CompletionFailure ex) {
278            log.error(JCDiagnostic.DiagnosticFlag.NON_DEFERRABLE, Position.NOPOS, "cant.access", ex.sym, ex.getDetailValue());
279            if (ex instanceof ClassFinder.BadClassFile) throw new Abort();
280        } finally {
281            depth--;
282        }
283
284        return (log.nerrors == startErrors);
285    }
286
287    public Completer getCompleter() {
288        return mainCompleter;
289    }
290
291    public ModuleSymbol getDefaultModule() {
292        return defaultModule;
293    }
294
295    public boolean modulesInitialized() {
296        return allModules != null;
297    }
298
299    private Set<ModuleSymbol> enterModules(List<JCCompilationUnit> trees, ClassSymbol c) {
300        Set<ModuleSymbol> modules = new LinkedHashSet<>();
301        for (JCCompilationUnit tree : trees) {
302            JavaFileObject prev = log.useSource(tree.sourcefile);
303            try {
304                enterModule(tree, c, modules);
305            } finally {
306                log.useSource(prev);
307            }
308        }
309        return modules;
310    }
311
312
313    private void enterModule(JCCompilationUnit toplevel, ClassSymbol c, Set<ModuleSymbol> modules) {
314        boolean isModuleInfo = toplevel.sourcefile.isNameCompatible("module-info", Kind.SOURCE);
315        boolean isModuleDecl = toplevel.getModuleDecl() != null;
316        if (isModuleDecl) {
317            JCModuleDecl decl = toplevel.getModuleDecl();
318            if (!isModuleInfo) {
319                log.error(decl.pos(), Errors.ModuleDeclSbInModuleInfoJava);
320            }
321            Name name = TreeInfo.fullName(decl.qualId);
322            ModuleSymbol sym;
323            if (c != null) {
324                sym = (ModuleSymbol) c.owner;
325                Assert.checkNonNull(sym.name);
326                Name treeName = TreeInfo.fullName(decl.qualId);
327                if (sym.name != treeName) {
328                    log.error(decl.pos(), Errors.ModuleNameMismatch(name, sym.name));
329                }
330            } else {
331                sym = syms.enterModule(name);
332                if (sym.module_info.sourcefile != null && sym.module_info.sourcefile != toplevel.sourcefile) {
333                    log.error(decl.pos(), Errors.DuplicateModule(sym));
334                    return;
335                }
336            }
337            sym.completer = getSourceCompleter(toplevel);
338            sym.module_info.sourcefile = toplevel.sourcefile;
339            decl.sym = sym;
340
341            if (multiModuleMode || modules.isEmpty()) {
342                modules.add(sym);
343            } else {
344                log.error(toplevel.pos(), Errors.TooManyModules);
345            }
346
347            Env<AttrContext> provisionalEnv = new Env<>(decl, null);
348
349            provisionalEnv.toplevel = toplevel;
350            typeEnvs.put(sym, provisionalEnv);
351        } else if (isModuleInfo) {
352            if (multiModuleMode) {
353                JCTree tree = toplevel.defs.isEmpty() ? toplevel : toplevel.defs.head;
354                log.error(tree.pos(), Errors.ExpectedModule);
355            }
356        }
357    }
358
359    private void setCompilationUnitModules(List<JCCompilationUnit> trees, Set<ModuleSymbol> rootModules, ClassSymbol c) {
360        // update the module for each compilation unit
361        if (multiModuleMode) {
362            checkNoAllModulePath();
363            for (JCCompilationUnit tree: trees) {
364                if (tree.defs.isEmpty()) {
365                    tree.modle = syms.unnamedModule;
366                    continue;
367                }
368
369                JavaFileObject prev = log.useSource(tree.sourcefile);
370                try {
371                    Location msplocn = getModuleLocation(tree);
372                    Location plocn = fileManager.hasLocation(StandardLocation.PATCH_MODULE_PATH) ?
373                            fileManager.getLocationForModule(StandardLocation.PATCH_MODULE_PATH,
374                                                             tree.sourcefile) :
375                            null;
376
377                    if (plocn != null) {
378                        Name name = names.fromString(fileManager.inferModuleName(plocn));
379                        ModuleSymbol msym = moduleFinder.findModule(name);
380                        tree.modle = msym;
381                        rootModules.add(msym);
382
383                        if (msplocn != null) {
384                            Name mspname = names.fromString(fileManager.inferModuleName(msplocn));
385                            if (name != mspname) {
386                                log.error(tree.pos(), Errors.FilePatchedAndMsp(name, mspname));
387                            }
388                        }
389                    } else if (msplocn != null) {
390                        if (tree.getModuleDecl() != null) {
391                            JavaFileObject canonical =
392                                    fileManager.getJavaFileForInput(msplocn, "module-info", Kind.SOURCE);
393                            if (canonical == null || !fileManager.isSameFile(canonical, tree.sourcefile)) {
394                                log.error(tree.pos(), Errors.ModuleNotFoundOnModuleSourcePath);
395                            }
396                        }
397                        Name name = names.fromString(fileManager.inferModuleName(msplocn));
398                        ModuleSymbol msym;
399                        JCModuleDecl decl = tree.getModuleDecl();
400                        if (decl != null) {
401                            msym = decl.sym;
402                            if (msym.name != name) {
403                                log.error(decl.qualId, Errors.ModuleNameMismatch(msym.name, name));
404                            }
405                        } else {
406                            if (tree.getPackage() == null) {
407                                log.error(tree.pos(), Errors.UnnamedPkgNotAllowedNamedModules);
408                            }
409                            msym = syms.enterModule(name);
410                        }
411                        if (msym.sourceLocation == null) {
412                            msym.sourceLocation = msplocn;
413                            if (fileManager.hasLocation(StandardLocation.PATCH_MODULE_PATH)) {
414                                msym.patchLocation = fileManager.getLocationForModule(
415                                        StandardLocation.PATCH_MODULE_PATH, msym.name.toString());
416                            }
417                            if (fileManager.hasLocation(StandardLocation.CLASS_OUTPUT)) {
418                                Location outputLocn = fileManager.getLocationForModule(
419                                        StandardLocation.CLASS_OUTPUT, msym.name.toString());
420                                if (msym.patchLocation == null) {
421                                    msym.classLocation = outputLocn;
422                                } else {
423                                    msym.patchOutputLocation = outputLocn;
424                                }
425                            }
426                        }
427                        tree.modle = msym;
428                        rootModules.add(msym);
429                    } else if (c != null && c.packge().modle == syms.unnamedModule) {
430                        tree.modle = syms.unnamedModule;
431                    } else {
432                        if (tree.getModuleDecl() != null) {
433                            log.error(tree.pos(), Errors.ModuleNotFoundOnModuleSourcePath);
434                        } else {
435                            log.error(tree.pos(), Errors.NotInModuleOnModuleSourcePath);
436                        }
437                        tree.modle = syms.errModule;
438                    }
439                } catch (IOException e) {
440                    throw new Error(e); // FIXME
441                } finally {
442                    log.useSource(prev);
443                }
444            }
445            if (syms.unnamedModule.sourceLocation == null) {
446                syms.unnamedModule.completer = getUnnamedModuleCompleter();
447                syms.unnamedModule.sourceLocation = StandardLocation.SOURCE_PATH;
448                syms.unnamedModule.classLocation = StandardLocation.CLASS_PATH;
449            }
450            defaultModule = syms.unnamedModule;
451        } else {
452            ModuleSymbol module = null;
453            if (defaultModule == null) {
454                String moduleOverride = singleModuleOverride(trees);
455                switch (rootModules.size()) {
456                    case 0:
457                        defaultModule = moduleFinder.findSingleModule();
458                        if (defaultModule == syms.unnamedModule) {
459                            if (moduleOverride != null) {
460                                checkNoAllModulePath();
461                                defaultModule = moduleFinder.findModule(names.fromString(moduleOverride));
462                                if (legacyModuleOverride != null) {
463                                    defaultModule.sourceLocation = StandardLocation.SOURCE_PATH;
464                                }
465                                defaultModule.patchOutputLocation = StandardLocation.CLASS_OUTPUT;
466                            } else {
467                                // Question: why not do findAllModules and initVisiblePackages here?
468                                // i.e. body of unnamedModuleCompleter
469                                defaultModule.completer = getUnnamedModuleCompleter();
470                                defaultModule.sourceLocation = StandardLocation.SOURCE_PATH;
471                                defaultModule.classLocation = StandardLocation.CLASS_PATH;
472                            }
473                        } else {
474                            checkNoAllModulePath();
475                            defaultModule.complete();
476                            // Question: why not do completeModule here?
477                            defaultModule.completer = sym -> completeModule((ModuleSymbol) sym);
478                            defaultModule.sourceLocation = StandardLocation.SOURCE_PATH;
479                        }
480                        rootModules.add(defaultModule);
481                        break;
482                    case 1:
483                        checkNoAllModulePath();
484                        defaultModule = rootModules.iterator().next();
485                        defaultModule.sourceLocation = StandardLocation.SOURCE_PATH;
486                        if (fileManager.hasLocation(StandardLocation.PATCH_MODULE_PATH)) {
487                            try {
488                                defaultModule.patchLocation = fileManager.getLocationForModule(
489                                        StandardLocation.PATCH_MODULE_PATH, defaultModule.name.toString());
490                            } catch (IOException ex) {
491                                throw new Error(ex);
492                            }
493                        }
494                        if (defaultModule.patchLocation == null) {
495                            defaultModule.classLocation = StandardLocation.CLASS_OUTPUT;
496                        } else {
497                            defaultModule.patchOutputLocation = StandardLocation.CLASS_OUTPUT;
498                        }
499                        break;
500                    default:
501                        Assert.error("too many modules");
502                }
503            } else if (rootModules.size() == 1) {
504                module = rootModules.iterator().next();
505                module.complete();
506                module.completer = sym -> completeModule((ModuleSymbol) sym);
507            } else {
508                Assert.check(rootModules.isEmpty());
509                String moduleOverride = singleModuleOverride(trees);
510                if (moduleOverride != null) {
511                    module = moduleFinder.findModule(names.fromString(moduleOverride));
512                } else {
513                    module = defaultModule;
514                }
515                rootModules.add(module);
516            }
517
518            if (defaultModule != syms.unnamedModule) {
519                syms.unnamedModule.completer = getUnnamedModuleCompleter();
520                syms.unnamedModule.classLocation = StandardLocation.CLASS_PATH;
521            }
522
523            if (module == null) {
524                module = defaultModule;
525            }
526
527            for (JCCompilationUnit tree: trees) {
528                tree.modle = module;
529            }
530        }
531    }
532
533    private String singleModuleOverride(List<JCCompilationUnit> trees) {
534        if (!fileManager.hasLocation(StandardLocation.PATCH_MODULE_PATH)) {
535            return legacyModuleOverride;
536        }
537
538        Set<String> override = new LinkedHashSet<>();
539        for (JCCompilationUnit tree : trees) {
540            JavaFileObject fo = tree.sourcefile;
541
542            try {
543                Location loc =
544                        fileManager.getLocationForModule(StandardLocation.PATCH_MODULE_PATH, fo);
545
546                if (loc != null) {
547                    override.add(fileManager.inferModuleName(loc));
548                }
549            } catch (IOException ex) {
550                throw new Error(ex);
551            }
552        }
553
554        switch (override.size()) {
555            case 0: return legacyModuleOverride;
556            case 1: return override.iterator().next();
557            default:
558                log.error(Errors.TooManyPatchedModules(override));
559                return null;
560        }
561    }
562
563    /**
564     * Determine the location for the module on the module source path
565     * or source output directory which contains a given CompilationUnit.
566     * If the source output directory is unset, the class output directory
567     * will be checked instead.
568     * {@code null} is returned if no such module can be found.
569     * @param tree the compilation unit tree
570     * @return the location for the enclosing module
571     * @throws IOException if there is a problem while searching for the module.
572     */
573    private Location getModuleLocation(JCCompilationUnit tree) throws IOException {
574        JavaFileObject fo = tree.sourcefile;
575
576        Location loc =
577                fileManager.getLocationForModule(StandardLocation.MODULE_SOURCE_PATH, fo);
578        if (loc == null) {
579            Location sourceOutput = fileManager.hasLocation(StandardLocation.SOURCE_OUTPUT) ?
580                    StandardLocation.SOURCE_OUTPUT : StandardLocation.CLASS_OUTPUT;
581            loc =
582                fileManager.getLocationForModule(sourceOutput, fo);
583        }
584        return loc;
585    }
586
587    private void checkNoAllModulePath() {
588        if (addModsOpt != null && Arrays.asList(addModsOpt.split(",")).contains(ALL_MODULE_PATH)) {
589            log.error(Errors.AddmodsAllModulePathInvalid);
590        }
591    }
592
593    private final Completer mainCompleter = new Completer() {
594        @Override
595        public void complete(Symbol sym) throws CompletionFailure {
596            ModuleSymbol msym = moduleFinder.findModule((ModuleSymbol) sym);
597
598            if (msym.kind == ERR) {
599                //make sure the module is initialized:
600                msym.directives = List.nil();
601                msym.exports = List.nil();
602                msym.provides = List.nil();
603                msym.requires = List.nil();
604                msym.uses = List.nil();
605            } else if ((msym.flags_field & Flags.AUTOMATIC_MODULE) != 0) {
606                setupAutomaticModule(msym);
607            } else {
608                msym.module_info.complete();
609            }
610
611            // If module-info comes from a .java file, the underlying
612            // call of classFinder.fillIn will have called through the
613            // source completer, to Enter, and then to Modules.enter,
614            // which will call completeModule.
615            // But, if module-info comes from a .class file, the underlying
616            // call of classFinder.fillIn will just call ClassReader to read
617            // the .class file, and so we call completeModule here.
618            if (msym.module_info.classfile == null || msym.module_info.classfile.getKind() == Kind.CLASS) {
619                completeModule(msym);
620            }
621        }
622
623        @Override
624        public String toString() {
625            return "mainCompleter";
626        }
627    };
628
629    private void setupAutomaticModule(ModuleSymbol msym) throws CompletionFailure {
630        try {
631            ListBuffer<Directive> directives = new ListBuffer<>();
632            ListBuffer<ExportsDirective> exports = new ListBuffer<>();
633            Set<String> seenPackages = new HashSet<>();
634
635            for (JavaFileObject clazz : fileManager.list(msym.classLocation, "", EnumSet.of(Kind.CLASS), true)) {
636                String binName = fileManager.inferBinaryName(msym.classLocation, clazz);
637                String pack = binName.lastIndexOf('.') != (-1) ? binName.substring(0, binName.lastIndexOf('.')) : ""; //unnamed package????
638                if (seenPackages.add(pack)) {
639                    ExportsDirective d = new ExportsDirective(syms.enterPackage(msym, names.fromString(pack)), null);
640                    //TODO: opens?
641                    directives.add(d);
642                    exports.add(d);
643                }
644            }
645
646            msym.exports = exports.toList();
647            msym.provides = List.nil();
648            msym.requires = List.nil();
649            msym.uses = List.nil();
650            msym.directives = directives.toList();
651            msym.flags_field |= Flags.ACYCLIC;
652        } catch (IOException ex) {
653            throw new IllegalStateException(ex);
654        }
655    }
656
657    private void completeAutomaticModule(ModuleSymbol msym) throws CompletionFailure {
658        ListBuffer<Directive> directives = new ListBuffer<>();
659
660        directives.addAll(msym.directives);
661
662        ListBuffer<RequiresDirective> requires = new ListBuffer<>();
663
664        for (ModuleSymbol ms : allModules()) {
665            if (ms == syms.unnamedModule || ms == msym)
666                continue;
667            Set<RequiresFlag> flags = (ms.flags_field & Flags.AUTOMATIC_MODULE) != 0 ?
668                    EnumSet.of(RequiresFlag.TRANSITIVE) : EnumSet.noneOf(RequiresFlag.class);
669            RequiresDirective d = new RequiresDirective(ms, flags);
670            directives.add(d);
671            requires.add(d);
672        }
673
674        RequiresDirective requiresUnnamed = new RequiresDirective(syms.unnamedModule);
675        directives.add(requiresUnnamed);
676        requires.add(requiresUnnamed);
677
678        msym.requires = requires.toList();
679        msym.directives = directives.toList();
680    }
681
682    private Completer getSourceCompleter(JCCompilationUnit tree) {
683        return new Completer() {
684            @Override
685            public void complete(Symbol sym) throws CompletionFailure {
686                ModuleSymbol msym = (ModuleSymbol) sym;
687                msym.flags_field |= UNATTRIBUTED;
688                ModuleVisitor v = new ModuleVisitor();
689                JavaFileObject prev = log.useSource(tree.sourcefile);
690                JCModuleDecl moduleDecl = tree.getModuleDecl();
691                DiagnosticPosition prevLintPos = deferredLintHandler.setPos(moduleDecl.pos());
692
693                try {
694                    moduleDecl.accept(v);
695                    completeModule(msym);
696                    checkCyclicDependencies(moduleDecl);
697                } finally {
698                    log.useSource(prev);
699                    deferredLintHandler.setPos(prevLintPos);
700                    msym.flags_field &= ~UNATTRIBUTED;
701                }
702            }
703
704            @Override
705            public String toString() {
706                return "SourceCompleter: " + tree.sourcefile.getName();
707            }
708
709        };
710    }
711
712    public boolean isRootModule(ModuleSymbol module) {
713        Assert.checkNonNull(rootModules);
714        return rootModules.contains(module);
715    }
716
717    public Set<ModuleSymbol> getRootModules() {
718        Assert.checkNonNull(rootModules);
719        return rootModules;
720    }
721
722    class ModuleVisitor extends JCTree.Visitor {
723        private ModuleSymbol sym;
724        private final Set<ModuleSymbol> allRequires = new HashSet<>();
725        private final Map<PackageSymbol,List<ExportsDirective>> allExports = new HashMap<>();
726        private final Map<PackageSymbol,List<OpensDirective>> allOpens = new HashMap<>();
727
728        @Override
729        public void visitModuleDef(JCModuleDecl tree) {
730            sym = Assert.checkNonNull(tree.sym);
731
732            if (tree.getModuleType() == ModuleKind.OPEN) {
733                sym.flags.add(ModuleFlags.OPEN);
734            }
735            sym.flags_field |= (tree.mods.flags & Flags.DEPRECATED);
736
737            sym.requires = List.nil();
738            sym.exports = List.nil();
739            sym.opens = List.nil();
740            tree.directives.forEach(t -> t.accept(this));
741            sym.requires = sym.requires.reverse();
742            sym.exports = sym.exports.reverse();
743            sym.opens = sym.opens.reverse();
744            ensureJavaBase();
745        }
746
747        @Override
748        public void visitRequires(JCRequires tree) {
749            ModuleSymbol msym = lookupModule(tree.moduleName);
750            if (msym.kind != MDL) {
751                log.error(tree.moduleName.pos(), Errors.ModuleNotFound(msym));
752                warnedMissing.add(msym);
753            } else if (allRequires.contains(msym)) {
754                log.error(tree.moduleName.pos(), Errors.DuplicateRequires(msym));
755            } else {
756                allRequires.add(msym);
757                Set<RequiresFlag> flags = EnumSet.noneOf(RequiresFlag.class);
758                if (tree.isTransitive)
759                    flags.add(RequiresFlag.TRANSITIVE);
760                if (tree.isStaticPhase)
761                    flags.add(RequiresFlag.STATIC_PHASE);
762                RequiresDirective d = new RequiresDirective(msym, flags);
763                tree.directive = d;
764                sym.requires = sym.requires.prepend(d);
765            }
766        }
767
768        @Override
769        public void visitExports(JCExports tree) {
770            Name name = TreeInfo.fullName(tree.qualid);
771            PackageSymbol packge = syms.enterPackage(sym, name);
772            attr.setPackageSymbols(tree.qualid, packge);
773
774            List<ExportsDirective> exportsForPackage = allExports.computeIfAbsent(packge, p -> List.nil());
775            for (ExportsDirective d : exportsForPackage) {
776                reportExportsConflict(tree, packge);
777            }
778
779            List<ModuleSymbol> toModules = null;
780            if (tree.moduleNames != null) {
781                Set<ModuleSymbol> to = new LinkedHashSet<>();
782                for (JCExpression n: tree.moduleNames) {
783                    ModuleSymbol msym = lookupModule(n);
784                    chk.checkModuleExists(n.pos(), msym);
785                    for (ExportsDirective d : exportsForPackage) {
786                        checkDuplicateExportsToModule(n, msym, d);
787                    }
788                    if (!to.add(msym)) {
789                        reportExportsConflictToModule(n, msym);
790                    }
791                }
792                toModules = List.from(to);
793            }
794
795            if (toModules == null || !toModules.isEmpty()) {
796                Set<ExportsFlag> flags = EnumSet.noneOf(ExportsFlag.class);
797                ExportsDirective d = new ExportsDirective(packge, toModules, flags);
798                sym.exports = sym.exports.prepend(d);
799                tree.directive = d;
800
801                allExports.put(packge, exportsForPackage.prepend(d));
802            }
803        }
804
805        private void reportExportsConflict(JCExports tree, PackageSymbol packge) {
806            log.error(tree.qualid.pos(), Errors.ConflictingExports(packge));
807        }
808
809        private void checkDuplicateExportsToModule(JCExpression name, ModuleSymbol msym,
810                ExportsDirective d) {
811            if (d.modules != null) {
812                for (ModuleSymbol other : d.modules) {
813                    if (msym == other) {
814                        reportExportsConflictToModule(name, msym);
815                    }
816                }
817            }
818        }
819
820        private void reportExportsConflictToModule(JCExpression name, ModuleSymbol msym) {
821            log.error(name.pos(), Errors.ConflictingExportsToModule(msym));
822        }
823
824        @Override
825        public void visitOpens(JCOpens tree) {
826            Name name = TreeInfo.fullName(tree.qualid);
827            PackageSymbol packge = syms.enterPackage(sym, name);
828            attr.setPackageSymbols(tree.qualid, packge);
829
830            if (sym.flags.contains(ModuleFlags.OPEN)) {
831                log.error(tree.pos(), Errors.NoOpensUnlessStrong);
832            }
833            List<OpensDirective> opensForPackage = allOpens.computeIfAbsent(packge, p -> List.nil());
834            for (OpensDirective d : opensForPackage) {
835                reportOpensConflict(tree, packge);
836            }
837
838            List<ModuleSymbol> toModules = null;
839            if (tree.moduleNames != null) {
840                Set<ModuleSymbol> to = new LinkedHashSet<>();
841                for (JCExpression n: tree.moduleNames) {
842                    ModuleSymbol msym = lookupModule(n);
843                    chk.checkModuleExists(n.pos(), msym);
844                    for (OpensDirective d : opensForPackage) {
845                        checkDuplicateOpensToModule(n, msym, d);
846                    }
847                    if (!to.add(msym)) {
848                        reportOpensConflictToModule(n, msym);
849                    }
850                }
851                toModules = List.from(to);
852            }
853
854            if (toModules == null || !toModules.isEmpty()) {
855                Set<OpensFlag> flags = EnumSet.noneOf(OpensFlag.class);
856                OpensDirective d = new OpensDirective(packge, toModules, flags);
857                sym.opens = sym.opens.prepend(d);
858                tree.directive = d;
859
860                allOpens.put(packge, opensForPackage.prepend(d));
861            }
862        }
863
864        private void reportOpensConflict(JCOpens tree, PackageSymbol packge) {
865            log.error(tree.qualid.pos(), Errors.ConflictingOpens(packge));
866        }
867
868        private void checkDuplicateOpensToModule(JCExpression name, ModuleSymbol msym,
869                OpensDirective d) {
870            if (d.modules != null) {
871                for (ModuleSymbol other : d.modules) {
872                    if (msym == other) {
873                        reportOpensConflictToModule(name, msym);
874                    }
875                }
876            }
877        }
878
879        private void reportOpensConflictToModule(JCExpression name, ModuleSymbol msym) {
880            log.error(name.pos(), Errors.ConflictingOpensToModule(msym));
881        }
882
883        @Override
884        public void visitProvides(JCProvides tree) { }
885
886        @Override
887        public void visitUses(JCUses tree) { }
888
889        private void ensureJavaBase() {
890            if (sym.name == names.java_base)
891                return;
892
893            for (RequiresDirective d: sym.requires) {
894                if (d.module.name == names.java_base)
895                    return;
896            }
897
898            ModuleSymbol java_base = syms.enterModule(names.java_base);
899            Directive.RequiresDirective d =
900                    new Directive.RequiresDirective(java_base,
901                            EnumSet.of(Directive.RequiresFlag.MANDATED));
902            sym.requires = sym.requires.prepend(d);
903        }
904
905        private ModuleSymbol lookupModule(JCExpression moduleName) {
906            Name name = TreeInfo.fullName(moduleName);
907            ModuleSymbol msym = moduleFinder.findModule(name);
908            TreeInfo.setSymbol(moduleName, msym);
909            return msym;
910        }
911    }
912
913    public Completer getUsesProvidesCompleter() {
914        return sym -> {
915            ModuleSymbol msym = (ModuleSymbol) sym;
916
917            msym.complete();
918
919            Env<AttrContext> env = typeEnvs.get(msym);
920            UsesProvidesVisitor v = new UsesProvidesVisitor(msym, env);
921            JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
922            JCModuleDecl decl = env.toplevel.getModuleDecl();
923            DiagnosticPosition prevLintPos = deferredLintHandler.setPos(decl.pos());
924
925            try {
926                decl.accept(v);
927            } finally {
928                log.useSource(prev);
929                deferredLintHandler.setPos(prevLintPos);
930            }
931        };
932    }
933
934    class UsesProvidesVisitor extends JCTree.Visitor {
935        private final ModuleSymbol msym;
936        private final Env<AttrContext> env;
937
938        private final Set<ClassSymbol> allUses = new HashSet<>();
939        private final Map<ClassSymbol, Set<ClassSymbol>> allProvides = new HashMap<>();
940
941        public UsesProvidesVisitor(ModuleSymbol msym, Env<AttrContext> env) {
942            this.msym = msym;
943            this.env = env;
944        }
945
946        @Override @SuppressWarnings("unchecked")
947        public void visitModuleDef(JCModuleDecl tree) {
948            msym.directives = List.nil();
949            msym.provides = List.nil();
950            msym.uses = List.nil();
951            tree.directives.forEach(t -> t.accept(this));
952            msym.directives = msym.directives.reverse();
953            msym.provides = msym.provides.reverse();
954            msym.uses = msym.uses.reverse();
955
956            if (msym.requires.nonEmpty() && msym.requires.head.flags.contains(RequiresFlag.MANDATED))
957                msym.directives = msym.directives.prepend(msym.requires.head);
958
959            msym.directives = msym.directives.appendList(List.from(addReads.getOrDefault(msym, Collections.emptySet())));
960
961            checkForCorrectness();
962        }
963
964        @Override
965        public void visitExports(JCExports tree) {
966            Iterable<Symbol> packageContent = tree.directive.packge.members().getSymbols();
967            List<JavaFileObject> filesToCheck = List.nil();
968            boolean packageNotEmpty = false;
969            for (Symbol sym : packageContent) {
970                if (sym.kind != Kinds.Kind.TYP)
971                    continue;
972                ClassSymbol csym = (ClassSymbol) sym;
973                if (sym.completer.isTerminal() ||
974                    csym.classfile.getKind() == Kind.CLASS) {
975                    packageNotEmpty = true;
976                    filesToCheck = List.nil();
977                    break;
978                }
979                if (csym.classfile.getKind() == Kind.SOURCE) {
980                    filesToCheck = filesToCheck.prepend(csym.classfile);
981                }
982            }
983            for (JavaFileObject jfo : filesToCheck) {
984                if (findPackageInFile.findPackageNameOf(jfo) == tree.directive.packge.fullname) {
985                    packageNotEmpty = true;
986                    break;
987                }
988            }
989            if (!packageNotEmpty) {
990                log.error(tree.qualid.pos(), Errors.PackageEmptyOrNotFound(tree.directive.packge));
991            }
992            msym.directives = msym.directives.prepend(tree.directive);
993        }
994
995        @Override
996        public void visitOpens(JCOpens tree) {
997            chk.checkPackageExistsForOpens(tree.qualid, tree.directive.packge);
998            msym.directives = msym.directives.prepend(tree.directive);
999        }
1000
1001        MethodSymbol noArgsConstructor(ClassSymbol tsym) {
1002            for (Symbol sym : tsym.members().getSymbolsByName(names.init)) {
1003                MethodSymbol mSym = (MethodSymbol)sym;
1004                if (mSym.params().isEmpty()) {
1005                    return mSym;
1006                }
1007            }
1008            return null;
1009        }
1010
1011        MethodSymbol factoryMethod(ClassSymbol tsym) {
1012            for (Symbol sym : tsym.members().getSymbolsByName(names.provider, sym -> sym.kind == MTH)) {
1013                MethodSymbol mSym = (MethodSymbol)sym;
1014                if (mSym.isStatic() && (mSym.flags() & Flags.PUBLIC) != 0 && mSym.params().isEmpty()) {
1015                    return mSym;
1016                }
1017            }
1018            return null;
1019        }
1020
1021        Map<Directive.ProvidesDirective, JCProvides> directiveToTreeMap = new HashMap<>();
1022
1023        @Override
1024        public void visitProvides(JCProvides tree) {
1025            Type st = attr.attribType(tree.serviceName, env, syms.objectType);
1026            ClassSymbol service = (ClassSymbol) st.tsym;
1027            if (allProvides.containsKey(service)) {
1028                log.error(tree.serviceName.pos(), Errors.RepeatedProvidesForService(service));
1029            }
1030            ListBuffer<ClassSymbol> impls = new ListBuffer<>();
1031            for (JCExpression implName : tree.implNames) {
1032                Type it;
1033                boolean prevVisitingServiceImplementation = env.info.visitingServiceImplementation;
1034                try {
1035                    env.info.visitingServiceImplementation = true;
1036                    it = attr.attribType(implName, env, syms.objectType);
1037                } finally {
1038                    env.info.visitingServiceImplementation = prevVisitingServiceImplementation;
1039                }
1040                ClassSymbol impl = (ClassSymbol) it.tsym;
1041                if ((impl.flags_field & PUBLIC) == 0) {
1042                    log.error(implName.pos(), Errors.NotDefPublic(impl, impl.location()));
1043                }
1044                //find provider factory:
1045                MethodSymbol factory = factoryMethod(impl);
1046                if (factory != null) {
1047                    Type returnType = factory.type.getReturnType();
1048                    if (!types.isSubtype(returnType, st)) {
1049                        log.error(implName.pos(), Errors.ServiceImplementationProviderReturnMustBeSubtypeOfServiceInterface);
1050                    }
1051                } else {
1052                    if (!types.isSubtype(it, st)) {
1053                        log.error(implName.pos(), Errors.ServiceImplementationMustBeSubtypeOfServiceInterface);
1054                    } else if ((impl.flags() & ABSTRACT) != 0) {
1055                        log.error(implName.pos(), Errors.ServiceImplementationIsAbstract(impl));
1056                    } else if (impl.isInner()) {
1057                        log.error(implName.pos(), Errors.ServiceImplementationIsInner(impl));
1058                    } else {
1059                        MethodSymbol constr = noArgsConstructor(impl);
1060                        if (constr == null) {
1061                            log.error(implName.pos(), Errors.ServiceImplementationDoesntHaveANoArgsConstructor(impl));
1062                        } else if ((constr.flags() & PUBLIC) == 0) {
1063                            log.error(implName.pos(), Errors.ServiceImplementationNoArgsConstructorNotPublic(impl));
1064                        }
1065                    }
1066                }
1067                if (it.hasTag(CLASS)) {
1068                    if (allProvides.computeIfAbsent(service, s -> new HashSet<>()).add(impl)) {
1069                        impls.append(impl);
1070                    } else {
1071                        log.error(implName.pos(), Errors.DuplicateProvides(service, impl));
1072                    }
1073                }
1074            }
1075            if (st.hasTag(CLASS) && !impls.isEmpty()) {
1076                Directive.ProvidesDirective d = new Directive.ProvidesDirective(service, impls.toList());
1077                msym.provides = msym.provides.prepend(d);
1078                msym.directives = msym.directives.prepend(d);
1079                directiveToTreeMap.put(d, tree);
1080            }
1081        }
1082
1083        @Override
1084        public void visitRequires(JCRequires tree) {
1085            if (tree.directive != null && allModules().contains(tree.directive.module)) {
1086                chk.checkDeprecated(tree.moduleName.pos(), msym, tree.directive.module);
1087                chk.checkModuleRequires(tree.moduleName.pos(), tree.directive);
1088                msym.directives = msym.directives.prepend(tree.directive);
1089            }
1090        }
1091
1092        @Override
1093        public void visitUses(JCUses tree) {
1094            Type st = attr.attribType(tree.qualid, env, syms.objectType);
1095            Symbol sym = TreeInfo.symbol(tree.qualid);
1096            if ((sym.flags() & ENUM) != 0) {
1097                log.error(tree.qualid.pos(), Errors.ServiceDefinitionIsEnum(st.tsym));
1098            } else if (st.hasTag(CLASS)) {
1099                ClassSymbol service = (ClassSymbol) st.tsym;
1100                if (allUses.add(service)) {
1101                    Directive.UsesDirective d = new Directive.UsesDirective(service);
1102                    msym.uses = msym.uses.prepend(d);
1103                    msym.directives = msym.directives.prepend(d);
1104                } else {
1105                    log.error(tree.pos(), Errors.DuplicateUses(service));
1106                }
1107            }
1108        }
1109
1110        private void checkForCorrectness() {
1111            for (Directive.ProvidesDirective provides : msym.provides) {
1112                JCProvides tree = directiveToTreeMap.get(provides);
1113                for (ClassSymbol impl : provides.impls) {
1114                    /* The implementation must be defined in the same module as the provides directive
1115                     * (else, error)
1116                     */
1117                    PackageSymbol implementationDefiningPackage = impl.packge();
1118                    if (implementationDefiningPackage.modle != msym) {
1119                        // TODO: should use tree for the implentation name, not the entire provides tree
1120                        // TODO: should improve error message to identify the implementation type
1121                        log.error(tree.pos(), Errors.ServiceImplementationNotInRightModule(implementationDefiningPackage.modle));
1122                    }
1123
1124                    /* There is no inherent requirement that module that provides a service should actually
1125                     * use it itself. However, it is a pointless declaration if the service package is not
1126                     * exported and there is no uses for the service.
1127                     */
1128                    PackageSymbol interfaceDeclaringPackage = provides.service.packge();
1129                    boolean isInterfaceDeclaredInCurrentModule = interfaceDeclaringPackage.modle == msym;
1130                    boolean isInterfaceExportedFromAReadableModule =
1131                            msym.visiblePackages.get(interfaceDeclaringPackage.fullname) == interfaceDeclaringPackage;
1132                    if (isInterfaceDeclaredInCurrentModule && !isInterfaceExportedFromAReadableModule) {
1133                        // ok the interface is declared in this module. Let's check if it's exported
1134                        boolean warn = true;
1135                        for (ExportsDirective export : msym.exports) {
1136                            if (interfaceDeclaringPackage == export.packge) {
1137                                warn = false;
1138                                break;
1139                            }
1140                        }
1141                        if (warn) {
1142                            for (UsesDirective uses : msym.uses) {
1143                                if (provides.service == uses.service) {
1144                                    warn = false;
1145                                    break;
1146                                }
1147                            }
1148                        }
1149                        if (warn) {
1150                            log.warning(tree.pos(), Warnings.ServiceProvidedButNotExportedOrUsed(provides.service));
1151                        }
1152                    }
1153                }
1154            }
1155        }
1156    }
1157
1158    private Set<ModuleSymbol> allModules;
1159
1160    public Set<ModuleSymbol> allModules() {
1161        Assert.checkNonNull(allModules);
1162        return allModules;
1163    }
1164
1165    private void setupAllModules() {
1166        Assert.checkNonNull(rootModules);
1167        Assert.checkNull(allModules);
1168
1169        Set<ModuleSymbol> observable;
1170
1171        if (limitModsOpt == null && extraLimitMods.isEmpty()) {
1172            observable = null;
1173        } else {
1174            Set<ModuleSymbol> limitMods = new HashSet<>();
1175            if (limitModsOpt != null) {
1176                for (String limit : limitModsOpt.split(",")) {
1177                    if (!isValidName(limit))
1178                        continue;
1179                    limitMods.add(syms.enterModule(names.fromString(limit)));
1180                }
1181            }
1182            for (String limit : extraLimitMods) {
1183                limitMods.add(syms.enterModule(names.fromString(limit)));
1184            }
1185            observable = computeTransitiveClosure(limitMods, null);
1186            observable.addAll(rootModules);
1187            if (lintOptions) {
1188                for (ModuleSymbol msym : limitMods) {
1189                    if (!observable.contains(msym)) {
1190                        log.warning(LintCategory.OPTIONS,
1191                                Warnings.ModuleForOptionNotFound(Option.LIMIT_MODULES, msym));
1192                    }
1193                }
1194            }
1195        }
1196
1197        Predicate<ModuleSymbol> observablePred = sym ->
1198             (observable == null) ? (moduleFinder.findModule(sym).kind != ERR) : observable.contains(sym);
1199        Predicate<ModuleSymbol> systemModulePred = sym -> (sym.flags() & Flags.SYSTEM_MODULE) != 0;
1200        Predicate<ModuleSymbol> noIncubatorPred = sym -> {
1201            sym.complete();
1202            return !sym.resolutionFlags.contains(ModuleResolutionFlags.DO_NOT_RESOLVE_BY_DEFAULT);
1203        };
1204        Set<ModuleSymbol> enabledRoot = new LinkedHashSet<>();
1205
1206        if (rootModules.contains(syms.unnamedModule)) {
1207            ModuleSymbol javaSE = syms.getModule(java_se);
1208            Predicate<ModuleSymbol> jdkModulePred;
1209
1210            if (javaSE != null && (observable == null || observable.contains(javaSE))) {
1211                jdkModulePred = sym -> {
1212                    sym.complete();
1213                    return   !sym.name.startsWith(java_)
1214                           && sym.exports.stream().anyMatch(e -> e.modules == null);
1215                };
1216                enabledRoot.add(javaSE);
1217            } else {
1218                jdkModulePred = sym -> true;
1219            }
1220
1221            for (ModuleSymbol sym : new HashSet<>(syms.getAllModules())) {
1222                if (systemModulePred.test(sym) && observablePred.test(sym) && jdkModulePred.test(sym) && noIncubatorPred.test(sym)) {
1223                    enabledRoot.add(sym);
1224                }
1225            }
1226        }
1227
1228        enabledRoot.addAll(rootModules);
1229
1230        if (addModsOpt != null || !extraAddMods.isEmpty()) {
1231            Set<String> fullAddMods = new HashSet<>();
1232            fullAddMods.addAll(extraAddMods);
1233
1234            if (addModsOpt != null) {
1235                fullAddMods.addAll(Arrays.asList(addModsOpt.split(",")));
1236            }
1237
1238            for (String added : fullAddMods) {
1239                Stream<ModuleSymbol> modules;
1240                switch (added) {
1241                    case ALL_SYSTEM:
1242                        modules = new HashSet<>(syms.getAllModules())
1243                                .stream()
1244                                .filter(systemModulePred.and(observablePred));
1245                        break;
1246                    case ALL_MODULE_PATH:
1247                        modules = new HashSet<>(syms.getAllModules())
1248                                .stream()
1249                                .filter(systemModulePred.negate().and(observablePred));
1250                        break;
1251                    default:
1252                        if (!isValidName(added))
1253                            continue;
1254                        modules = Stream.of(syms.enterModule(names.fromString(added)));
1255                        break;
1256                }
1257                modules.forEach(sym -> {
1258                    enabledRoot.add(sym);
1259                    if (observable != null)
1260                        observable.add(sym);
1261                });
1262            }
1263        }
1264
1265        Set<ModuleSymbol> result = computeTransitiveClosure(enabledRoot, observable);
1266
1267        result.add(syms.unnamedModule);
1268
1269        boolean hasAutomatic = result.stream().anyMatch(IS_AUTOMATIC);
1270
1271        if (hasAutomatic) {
1272            syms.getAllModules()
1273                .stream()
1274                .filter(IS_AUTOMATIC)
1275                .forEach(result::add);
1276        }
1277
1278        String incubatingModules = result.stream()
1279                .filter(msym -> msym.resolutionFlags.contains(ModuleResolutionFlags.WARN_INCUBATING))
1280                .map(msym -> msym.name.toString())
1281                .collect(Collectors.joining(","));
1282
1283        if (!incubatingModules.isEmpty()) {
1284            log.warning(Warnings.IncubatingModules(incubatingModules));
1285        }
1286
1287        allModules = result;
1288
1289        //add module versions from options, if any:
1290        if (moduleVersionOpt != null) {
1291            Name version = names.fromString(moduleVersionOpt);
1292            rootModules.forEach(m -> m.version = version);
1293        }
1294    }
1295    //where:
1296        private static final Predicate<ModuleSymbol> IS_AUTOMATIC =
1297                m -> (m.flags_field & Flags.AUTOMATIC_MODULE) != 0;
1298
1299    public boolean isInModuleGraph(ModuleSymbol msym) {
1300        return allModules == null || allModules.contains(msym);
1301    }
1302
1303    private Set<ModuleSymbol> computeTransitiveClosure(Set<? extends ModuleSymbol> base, Set<ModuleSymbol> observable) {
1304        List<ModuleSymbol> primaryTodo = List.nil();
1305        List<ModuleSymbol> secondaryTodo = List.nil();
1306
1307        for (ModuleSymbol ms : base) {
1308            primaryTodo = primaryTodo.prepend(ms);
1309        }
1310
1311        Set<ModuleSymbol> result = new LinkedHashSet<>();
1312        result.add(syms.java_base);
1313
1314        while (primaryTodo.nonEmpty() || secondaryTodo.nonEmpty()) {
1315            ModuleSymbol current;
1316            boolean isPrimaryTodo;
1317            if (primaryTodo.nonEmpty()) {
1318                current = primaryTodo.head;
1319                primaryTodo = primaryTodo.tail;
1320                isPrimaryTodo = true;
1321            } else {
1322                current = secondaryTodo.head;
1323                secondaryTodo = secondaryTodo.tail;
1324                isPrimaryTodo = false;
1325            }
1326            if (observable != null && !observable.contains(current))
1327                continue;
1328            if (!result.add(current) || current == syms.unnamedModule || ((current.flags_field & Flags.AUTOMATIC_MODULE) != 0))
1329                continue;
1330            current.complete();
1331            if (current.kind == ERR && isPrimaryTodo && warnedMissing.add(current)) {
1332                log.error(Errors.ModuleNotFound(current));
1333            }
1334            for (RequiresDirective rd : current.requires) {
1335                if (rd.module == syms.java_base) continue;
1336                if ((rd.isTransitive() && isPrimaryTodo) || base.contains(current)) {
1337                    primaryTodo = primaryTodo.prepend(rd.module);
1338                } else {
1339                    secondaryTodo = secondaryTodo.prepend(rd.module);
1340                }
1341            }
1342        }
1343
1344        return result;
1345    }
1346
1347    public ModuleSymbol getObservableModule(Name name) {
1348        ModuleSymbol mod = syms.getModule(name);
1349
1350        if (allModules().contains(mod)) {
1351            return mod;
1352        }
1353
1354        return null;
1355    }
1356
1357    private Completer getUnnamedModuleCompleter() {
1358        moduleFinder.findAllModules();
1359        return new Symbol.Completer() {
1360            @Override
1361            public void complete(Symbol sym) throws CompletionFailure {
1362                if (inInitModules) {
1363                    sym.completer = this;
1364                    return ;
1365                }
1366                ModuleSymbol msym = (ModuleSymbol) sym;
1367                Set<ModuleSymbol> allModules = new HashSet<>(allModules());
1368                allModules.remove(syms.unnamedModule);
1369                for (ModuleSymbol m : allModules) {
1370                    m.complete();
1371                }
1372                initVisiblePackages(msym, allModules);
1373            }
1374
1375            @Override
1376            public String toString() {
1377                return "unnamedModule Completer";
1378            }
1379        };
1380    }
1381
1382    private final Map<ModuleSymbol, Set<ModuleSymbol>> requiresTransitiveCache = new HashMap<>();
1383
1384    private void completeModule(ModuleSymbol msym) {
1385        if (inInitModules) {
1386            msym.completer = sym -> completeModule(msym);
1387            return ;
1388        }
1389
1390        if ((msym.flags_field & Flags.AUTOMATIC_MODULE) != 0) {
1391            completeAutomaticModule(msym);
1392        }
1393
1394        Assert.checkNonNull(msym.requires);
1395
1396        initAddReads();
1397
1398        msym.requires = msym.requires.appendList(List.from(addReads.getOrDefault(msym, Collections.emptySet())));
1399
1400        List<RequiresDirective> requires = msym.requires;
1401
1402        while (requires.nonEmpty()) {
1403            if (!allModules().contains(requires.head.module)) {
1404                Env<AttrContext> env = typeEnvs.get(msym);
1405                if (env != null) {
1406                    JavaFileObject origSource = log.useSource(env.toplevel.sourcefile);
1407                    try {
1408                        log.error(/*XXX*/env.tree, Errors.ModuleNotFound(requires.head.module));
1409                    } finally {
1410                        log.useSource(origSource);
1411                    }
1412                } else {
1413                    Assert.check((msym.flags() & Flags.AUTOMATIC_MODULE) == 0);
1414                }
1415                msym.requires = List.filter(msym.requires, requires.head);
1416            }
1417            requires = requires.tail;
1418        }
1419
1420        Set<ModuleSymbol> readable = new LinkedHashSet<>();
1421        Set<ModuleSymbol> requiresTransitive = new HashSet<>();
1422
1423        for (RequiresDirective d : msym.requires) {
1424            d.module.complete();
1425            readable.add(d.module);
1426            Set<ModuleSymbol> s = retrieveRequiresTransitive(d.module);
1427            Assert.checkNonNull(s, () -> "no entry in cache for " + d.module);
1428            readable.addAll(s);
1429            if (d.flags.contains(RequiresFlag.TRANSITIVE)) {
1430                requiresTransitive.add(d.module);
1431                requiresTransitive.addAll(s);
1432            }
1433        }
1434
1435        requiresTransitiveCache.put(msym, requiresTransitive);
1436        initVisiblePackages(msym, readable);
1437        for (ExportsDirective d: msym.exports) {
1438            if (d.packge != null) {
1439                d.packge.modle = msym;
1440            }
1441        }
1442
1443    }
1444
1445    private Set<ModuleSymbol> retrieveRequiresTransitive(ModuleSymbol msym) {
1446        Set<ModuleSymbol> requiresTransitive = requiresTransitiveCache.get(msym);
1447
1448        if (requiresTransitive == null) {
1449            //the module graph may contain cycles involving automatic modules or --add-reads edges
1450            requiresTransitive = new HashSet<>();
1451
1452            Set<ModuleSymbol> seen = new HashSet<>();
1453            List<ModuleSymbol> todo = List.of(msym);
1454
1455            while (todo.nonEmpty()) {
1456                ModuleSymbol current = todo.head;
1457                todo = todo.tail;
1458                if (!seen.add(current))
1459                    continue;
1460                requiresTransitive.add(current);
1461                current.complete();
1462                Iterable<? extends RequiresDirective> requires;
1463                if (current != syms.unnamedModule) {
1464                    Assert.checkNonNull(current.requires, () -> current + ".requires == null; " + msym);
1465                    requires = current.requires;
1466                    for (RequiresDirective rd : requires) {
1467                        if (rd.isTransitive())
1468                            todo = todo.prepend(rd.module);
1469                    }
1470                } else {
1471                    for (ModuleSymbol mod : allModules()) {
1472                        todo = todo.prepend(mod);
1473                    }
1474                }
1475            }
1476
1477            requiresTransitive.remove(msym);
1478        }
1479
1480        return requiresTransitive;
1481    }
1482
1483    private void initVisiblePackages(ModuleSymbol msym, Collection<ModuleSymbol> readable) {
1484        initAddExports();
1485
1486        msym.visiblePackages = new LinkedHashMap<>();
1487        msym.readModules = new HashSet<>(readable);
1488
1489        Map<Name, ModuleSymbol> seen = new HashMap<>();
1490
1491        for (ModuleSymbol rm : readable) {
1492            if (rm == syms.unnamedModule)
1493                continue;
1494            addVisiblePackages(msym, seen, rm, rm.exports);
1495        }
1496
1497        addExports.forEach((exportsFrom, exports) -> {
1498            addVisiblePackages(msym, seen, exportsFrom, exports);
1499        });
1500    }
1501
1502    private void addVisiblePackages(ModuleSymbol msym,
1503                                    Map<Name, ModuleSymbol> seenPackages,
1504                                    ModuleSymbol exportsFrom,
1505                                    Collection<ExportsDirective> exports) {
1506        for (ExportsDirective d : exports) {
1507            if (d.modules == null || d.modules.contains(msym)) {
1508                Name packageName = d.packge.fullname;
1509                ModuleSymbol previousModule = seenPackages.get(packageName);
1510
1511                if (previousModule != null && previousModule != exportsFrom) {
1512                    Env<AttrContext> env = typeEnvs.get(msym);
1513                    JavaFileObject origSource = env != null ? log.useSource(env.toplevel.sourcefile)
1514                                                            : null;
1515                    DiagnosticPosition pos = env != null ? env.tree.pos() : null;
1516                    try {
1517                        log.error(pos, Errors.PackageClashFromRequires(msym, packageName,
1518                                                                      previousModule, exportsFrom));
1519                    } finally {
1520                        if (env != null)
1521                            log.useSource(origSource);
1522                    }
1523                    continue;
1524                }
1525
1526                seenPackages.put(packageName, exportsFrom);
1527                msym.visiblePackages.put(d.packge.fullname, d.packge);
1528            }
1529        }
1530    }
1531
1532    private void initAddExports() {
1533        if (addExports != null)
1534            return;
1535
1536        addExports = new LinkedHashMap<>();
1537        Set<ModuleSymbol> unknownModules = new HashSet<>();
1538
1539        if (addExportsOpt == null)
1540            return;
1541
1542        Pattern ep = Pattern.compile("([^/]+)/([^=]+)=(.*)");
1543        for (String s: addExportsOpt.split("\0+")) {
1544            if (s.isEmpty())
1545                continue;
1546            Matcher em = ep.matcher(s);
1547            if (!em.matches()) {
1548                continue;
1549            }
1550
1551            // Terminology comes from
1552            //  --add-exports module/package=target,...
1553            // Compare to
1554            //  module module { exports package to target, ... }
1555            String moduleName = em.group(1);
1556            String packageName = em.group(2);
1557            String targetNames = em.group(3);
1558
1559            if (!isValidName(moduleName))
1560                continue;
1561
1562            ModuleSymbol msym = syms.enterModule(names.fromString(moduleName));
1563            if (!isKnownModule(msym, unknownModules))
1564                continue;
1565
1566            if (!isValidName(packageName))
1567                continue;
1568            PackageSymbol p = syms.enterPackage(msym, names.fromString(packageName));
1569            p.modle = msym;  // TODO: do we need this?
1570
1571            List<ModuleSymbol> targetModules = List.nil();
1572            for (String toModule : targetNames.split("[ ,]+")) {
1573                ModuleSymbol m;
1574                if (toModule.equals("ALL-UNNAMED")) {
1575                    m = syms.unnamedModule;
1576                } else {
1577                    if (!isValidName(toModule))
1578                        continue;
1579                    m = syms.enterModule(names.fromString(toModule));
1580                    if (!isKnownModule(m, unknownModules))
1581                        continue;
1582                }
1583                targetModules = targetModules.prepend(m);
1584            }
1585
1586            Set<ExportsDirective> extra = addExports.computeIfAbsent(msym, _x -> new LinkedHashSet<>());
1587            ExportsDirective d = new ExportsDirective(p, targetModules);
1588            extra.add(d);
1589        }
1590    }
1591
1592    private boolean isKnownModule(ModuleSymbol msym, Set<ModuleSymbol> unknownModules) {
1593        if (allModules.contains(msym)) {
1594            return true;
1595        }
1596
1597        if (!unknownModules.contains(msym)) {
1598            if (lintOptions) {
1599                log.warning(LintCategory.OPTIONS,
1600                        Warnings.ModuleForOptionNotFound(Option.ADD_EXPORTS, msym));
1601            }
1602            unknownModules.add(msym);
1603        }
1604        return false;
1605    }
1606
1607    private void initAddReads() {
1608        if (addReads != null)
1609            return;
1610
1611        addReads = new LinkedHashMap<>();
1612
1613        if (addReadsOpt == null)
1614            return;
1615
1616        Pattern rp = Pattern.compile("([^=]+)=(.*)");
1617        for (String s : addReadsOpt.split("\0+")) {
1618            if (s.isEmpty())
1619                continue;
1620            Matcher rm = rp.matcher(s);
1621            if (!rm.matches()) {
1622                continue;
1623            }
1624
1625            // Terminology comes from
1626            //  --add-reads source-module=target-module,...
1627            // Compare to
1628            //  module source-module { requires target-module; ... }
1629            String sourceName = rm.group(1);
1630            String targetNames = rm.group(2);
1631
1632            if (!isValidName(sourceName))
1633                continue;
1634
1635            ModuleSymbol msym = syms.enterModule(names.fromString(sourceName));
1636            if (!allModules.contains(msym)) {
1637                if (lintOptions) {
1638                    log.warning(Warnings.ModuleForOptionNotFound(Option.ADD_READS, msym));
1639                }
1640                continue;
1641            }
1642
1643            for (String targetName : targetNames.split("[ ,]+", -1)) {
1644                ModuleSymbol targetModule;
1645                if (targetName.equals("ALL-UNNAMED")) {
1646                    targetModule = syms.unnamedModule;
1647                } else {
1648                    if (!isValidName(targetName))
1649                        continue;
1650                    targetModule = syms.enterModule(names.fromString(targetName));
1651                    if (!allModules.contains(targetModule)) {
1652                        if (lintOptions) {
1653                            log.warning(LintCategory.OPTIONS, Warnings.ModuleForOptionNotFound(Option.ADD_READS, targetModule));
1654                        }
1655                        continue;
1656                    }
1657                }
1658                addReads.computeIfAbsent(msym, m -> new HashSet<>())
1659                        .add(new RequiresDirective(targetModule, EnumSet.of(RequiresFlag.EXTRA)));
1660            }
1661        }
1662    }
1663
1664    private void checkCyclicDependencies(JCModuleDecl mod) {
1665        for (JCDirective d : mod.directives) {
1666            JCRequires rd;
1667            if (!d.hasTag(Tag.REQUIRES) || (rd = (JCRequires) d).directive == null)
1668                continue;
1669            Set<ModuleSymbol> nonSyntheticDeps = new HashSet<>();
1670            List<ModuleSymbol> queue = List.of(rd.directive.module);
1671            while (queue.nonEmpty()) {
1672                ModuleSymbol current = queue.head;
1673                queue = queue.tail;
1674                if (!nonSyntheticDeps.add(current))
1675                    continue;
1676                current.complete();
1677                if ((current.flags() & Flags.ACYCLIC) != 0)
1678                    continue;
1679                Assert.checkNonNull(current.requires, current::toString);
1680                for (RequiresDirective dep : current.requires) {
1681                    if (!dep.flags.contains(RequiresFlag.EXTRA))
1682                        queue = queue.prepend(dep.module);
1683                }
1684            }
1685            if (nonSyntheticDeps.contains(mod.sym)) {
1686                log.error(rd.moduleName.pos(), Errors.CyclicRequires(rd.directive.module));
1687            }
1688            mod.sym.flags_field |= Flags.ACYCLIC;
1689        }
1690    }
1691
1692    private boolean isValidName(CharSequence name) {
1693        return SourceVersion.isName(name, Source.toSourceVersion(source));
1694    }
1695
1696    // DEBUG
1697    private String toString(ModuleSymbol msym) {
1698        return msym.name + "["
1699                + "kind:" + msym.kind + ";"
1700                + "locn:" + toString(msym.sourceLocation) + "," + toString(msym.classLocation) + ";"
1701                + "info:" + toString(msym.module_info.sourcefile) + ","
1702                            + toString(msym.module_info.classfile) + ","
1703                            + msym.module_info.completer
1704                + "]";
1705    }
1706
1707    // DEBUG
1708    String toString(Location locn) {
1709        return (locn == null) ? "--" : locn.getName();
1710    }
1711
1712    // DEBUG
1713    String toString(JavaFileObject fo) {
1714        return (fo == null) ? "--" : fo.getName();
1715    }
1716
1717    public void newRound() {
1718        allModules = null;
1719        rootModules = null;
1720        warnedMissing.clear();
1721    }
1722
1723    public interface PackageNameFinder {
1724        public Name findPackageNameOf(JavaFileObject jfo);
1725    }
1726}
1727