1 /*
2 * Copyright (c) 2014, 2018, 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 package jdk.internal.module;
27
28 import java.io.File;
29 import java.io.PrintStream;
30 import java.lang.module.Configuration;
31 import java.lang.module.ModuleDescriptor;
32 import java.lang.module.ModuleFinder;
33 import java.lang.module.ModuleReference;
34 import java.lang.module.ResolvedModule;
35 import java.net.URI;
36 import java.nio.file.Path;
37 import java.nio.file.Paths;
38 import java.util.ArrayList;
39 import java.util.Collections;
40 import java.util.HashMap;
41 import java.util.HashSet;
42 import java.util.Iterator;
43 import java.util.LinkedHashMap;
44 import java.util.List;
45 import java.util.Map;
46 import java.util.NoSuchElementException;
47 import java.util.Objects;
48 import java.util.Optional;
49 import java.util.Set;
50 import java.util.function.Function;
51 import java.util.stream.Collectors;
52
53 import jdk.internal.loader.BootLoader;
54 import jdk.internal.loader.BuiltinClassLoader;
55 import jdk.internal.misc.JavaLangAccess;
56 import jdk.internal.misc.JavaLangModuleAccess;
57 import jdk.internal.misc.SharedSecrets;
58 import jdk.internal.perf.PerfCounter;
59
60 /**
61 * Initializes/boots the module system.
62 *
63 * The {@link #boot() boot} method is called early in the startup to initialize
64 * the module system. In summary, the boot method creates a Configuration by
65 * resolving a set of module names specified via the launcher (or equivalent)
66 * -m and --add-modules options. The modules are located on a module path that
67 * is constructed from the upgrade module path, system modules, and application
68 * module path. The Configuration is instantiated as the boot layer with each
69 * module in the configuration defined to a class loader.
70 */
71
72 public final class ModuleBootstrap {
73 private ModuleBootstrap() { }
74
75 private static final String JAVA_BASE = "java.base";
76
77 // the token for "all default modules"
78 private static final String ALL_DEFAULT = "ALL-DEFAULT";
79
80 // the token for "all unnamed modules"
81 private static final String ALL_UNNAMED = "ALL-UNNAMED";
82
83 // the token for "all system modules"
84 private static final String ALL_SYSTEM = "ALL-SYSTEM";
85
86 // the token for "all modules on the module path"
87 private static final String ALL_MODULE_PATH = "ALL-MODULE-PATH";
88
89 // access to java.lang/module
90 private static final JavaLangModuleAccess JLMA
91 = SharedSecrets.getJavaLangModuleAccess();
92
93 // The ModulePatcher for the initial configuration
94 private static final ModulePatcher patcher = initModulePatcher();
95
96 /**
97 * Returns the ModulePatcher for the initial configuration.
98 */
99 public static ModulePatcher patcher() {
100 return patcher;
101 }
102
103 // ModuleFinders for the initial configuration
104 private static volatile ModuleFinder unlimitedFinder;
105 private static volatile ModuleFinder limitedFinder;
106
107 /**
108 * Returns the ModuleFinder for the initial configuration before
109 * observability is limited by the --limit-modules command line option.
110 *
111 * @apiNote Used to support locating modules {@code java.instrument} and
112 * {@code jdk.management.agent} modules when they are loaded dynamically.
113 */
114 public static ModuleFinder unlimitedFinder() {
115 ModuleFinder finder = unlimitedFinder;
116 if (finder == null) {
117 return ModuleFinder.ofSystem();
118 } else {
119 return finder;
120 }
121 }
122
123 /**
124 * Returns the ModuleFinder for the initial configuration.
125 *
126 * @apiNote Used to support "{@code java --list-modules}".
127 */
128 public static ModuleFinder limitedFinder() {
129 ModuleFinder finder = limitedFinder;
130 if (finder == null) {
131 return unlimitedFinder();
132 } else {
133 return finder;
134 }
135 }
136
137 /**
138 * Initialize the module system, returning the boot layer.
139 *
140 * @see java.lang.System#initPhase2(boolean, boolean)
141 */
142 public static ModuleLayer boot() throws Exception {
143
144 // Step 0: Command line options
145
146 long t0 = System.nanoTime();
147
148 ModuleFinder upgradeModulePath = finderFor("jdk.module.upgrade.path");
149 ModuleFinder appModulePath = finderFor("jdk.module.path");
150 boolean isPatched = patcher.hasPatches();
151
152 String mainModule = System.getProperty("jdk.module.main");
153 Set<String> addModules = addModules();
154 Set<String> limitModules = limitModules();
155
156 PrintStream traceOutput = null;
157 String trace = getAndRemoveProperty("jdk.module.showModuleResolution");
158 if (trace != null && Boolean.parseBoolean(trace))
159 traceOutput = System.out;
160
161
162 // Step 1: The observable system modules, either all system modules
163 // or the system modules pre-generated for the initial module (the
164 // initial module may be the unnamed module). If the system modules
165 // are pre-generated for the initial module then resolution can be
166 // skipped.
167
168 long t1 = System.nanoTime();
169
170 SystemModules systemModules = null;
171 ModuleFinder systemModuleFinder;
172
173 boolean haveModulePath = (appModulePath != null || upgradeModulePath != null);
174 boolean needResolution = true;
175 boolean canArchive = false;
176
177 // If the java heap was archived at CDS dump time and the environment
178 // at dump time matches the current environment then use the archived
179 // system modules and finder.
180 ArchivedModuleGraph archivedModuleGraph = ArchivedModuleGraph.get(mainModule);
181 if (archivedModuleGraph != null
182 && !haveModulePath
183 && addModules.isEmpty()
184 && limitModules.isEmpty()
185 && !isPatched) {
186 systemModules = archivedModuleGraph.systemModules();
187 systemModuleFinder = archivedModuleGraph.finder();
188 needResolution = (traceOutput != null);
189 } else {
190 if (!haveModulePath && addModules.isEmpty() && limitModules.isEmpty()) {
191 systemModules = SystemModuleFinders.systemModules(mainModule);
192 if (systemModules != null && !isPatched) {
193 needResolution = (traceOutput != null);
194 canArchive = true;
195 }
196 }
197 if (systemModules == null) {
198 // all system modules are observable
199 systemModules = SystemModuleFinders.allSystemModules();
200 }
201 if (systemModules != null) {
202 // images build
203 systemModuleFinder = SystemModuleFinders.of(systemModules);
204 } else {
205 // exploded build or testing
206 systemModules = new ExplodedSystemModules();
207 systemModuleFinder = SystemModuleFinders.ofSystem();
208 }
209 }
210
211 Counters.add("jdk.module.boot.1.systemModulesTime", t1);
212
213
214 // Step 2: Define and load java.base. This patches all classes loaded
215 // to date so that they are members of java.base. Once java.base is
216 // loaded then resources in java.base are available for error messages
217 // needed from here on.
218
219 long t2 = System.nanoTime();
220
221 ModuleReference base = systemModuleFinder.find(JAVA_BASE).orElse(null);
222 if (base == null)
223 throw new InternalError(JAVA_BASE + " not found");
224 URI baseUri = base.location().orElse(null);
225 if (baseUri == null)
226 throw new InternalError(JAVA_BASE + " does not have a location");
227 BootLoader.loadModule(base);
228 Modules.defineModule(null, base.descriptor(), baseUri);
229
230 Counters.add("jdk.module.boot.2.defineBaseTime", t2);
231
232
233 // Step 2a: Scan all modules when --validate-modules specified
234
235 if (getAndRemoveProperty("jdk.module.validation") != null) {
236 int errors = ModulePathValidator.scanAllModules(System.out);
237 if (errors > 0) {
238 fail("Validation of module path failed");
239 }
240 }
241
242
243 // Step 3: If resolution is needed then create the module finder and
244 // the set of root modules to resolve.
245
246 long t3 = System.nanoTime();
247
248 ModuleFinder savedModuleFinder = null;
249 ModuleFinder finder;
250 Set<String> roots;
251 if (needResolution) {
252
253 // upgraded modules override the modules in the run-time image
254 if (upgradeModulePath != null)
255 systemModuleFinder = ModuleFinder.compose(upgradeModulePath,
256 systemModuleFinder);
257
258 // The module finder: [--upgrade-module-path] system [--module-path]
259 if (appModulePath != null) {
260 finder = ModuleFinder.compose(systemModuleFinder, appModulePath);
261 } else {
262 finder = systemModuleFinder;
263 }
264
265 // The root modules to resolve
266 roots = new HashSet<>();
267
268 // launcher -m option to specify the main/initial module
269 if (mainModule != null)
270 roots.add(mainModule);
271
272 // additional module(s) specified by --add-modules
273 boolean addAllDefaultModules = false;
274 boolean addAllSystemModules = false;
275 boolean addAllApplicationModules = false;
276 for (String mod : addModules) {
277 switch (mod) {
278 case ALL_DEFAULT:
279 addAllDefaultModules = true;
280 break;
281 case ALL_SYSTEM:
282 addAllSystemModules = true;
283 break;
284 case ALL_MODULE_PATH:
285 addAllApplicationModules = true;
286 break;
287 default:
288 roots.add(mod);
289 }
290 }
291
292 // --limit-modules
293 savedModuleFinder = finder;
294 if (!limitModules.isEmpty()) {
295 finder = limitFinder(finder, limitModules, roots);
296 }
297
298 // If there is no initial module specified then assume that the initial
299 // module is the unnamed module of the application class loader. This
300 // is implemented by resolving all observable modules that export an
301 // API. Modules that have the DO_NOT_RESOLVE_BY_DEFAULT bit set in
302 // their ModuleResolution attribute flags are excluded from the
303 // default set of roots.
304 if (mainModule == null || addAllDefaultModules) {
305 roots.addAll(DefaultRoots.compute(systemModuleFinder, finder));
306 }
307
308 // If `--add-modules ALL-SYSTEM` is specified then all observable system
309 // modules will be resolved.
310 if (addAllSystemModules) {
311 ModuleFinder f = finder; // observable modules
312 systemModuleFinder.findAll()
313 .stream()
314 .map(ModuleReference::descriptor)
315 .map(ModuleDescriptor::name)
316 .filter(mn -> f.find(mn).isPresent()) // observable
317 .forEach(mn -> roots.add(mn));
318 }
319
320 // If `--add-modules ALL-MODULE-PATH` is specified then all observable
321 // modules on the application module path will be resolved.
322 if (appModulePath != null && addAllApplicationModules) {
323 ModuleFinder f = finder; // observable modules
324 appModulePath.findAll()
325 .stream()
326 .map(ModuleReference::descriptor)
327 .map(ModuleDescriptor::name)
328 .filter(mn -> f.find(mn).isPresent()) // observable
329 .forEach(mn -> roots.add(mn));
330 }
331 } else {
332 // no resolution case
333 finder = systemModuleFinder;
334 roots = null;
335 }
336
337 Counters.add("jdk.module.boot.3.optionsAndRootsTime", t3);
338
339 // Step 4: Resolve the root modules, with service binding, to create
340 // the configuration for the boot layer. If resolution is not needed
341 // then create the configuration for the boot layer from the
342 // readability graph created at link time.
343
344 long t4 = System.nanoTime();
345
346 Configuration cf;
347 if (needResolution) {
348 cf = JLMA.resolveAndBind(finder, roots, traceOutput);
349 } else {
350 if (archivedModuleGraph != null) {
351 cf = archivedModuleGraph.configuration();
352 } else {
353 Map<String, Set<String>> map = systemModules.moduleReads();
354 cf = JLMA.newConfiguration(systemModuleFinder, map);
355 }
356 }
357
358 // check that modules specified to --patch-module are resolved
359 if (isPatched) {
360 patcher.patchedModules()
361 .stream()
362 .filter(mn -> !cf.findModule(mn).isPresent())
363 .forEach(mn -> warnUnknownModule(PATCH_MODULE, mn));
364 }
365
366 Counters.add("jdk.module.boot.4.resolveTime", t4);
367
368
369 // Step 5: Map the modules in the configuration to class loaders.
370 // The static configuration provides the mapping of standard and JDK
371 // modules to the boot and platform loaders. All other modules (JDK
372 // tool modules, and both explicit and automatic modules on the
373 // application module path) are defined to the application class
374 // loader.
375
376 long t5 = System.nanoTime();
377
378 // mapping of modules to class loaders
379 Function<String, ClassLoader> clf = ModuleLoaderMap.mappingFunction(cf);
380
381 // check that all modules to be mapped to the boot loader will be
382 // loaded from the runtime image
383 if (haveModulePath) {
384 for (ResolvedModule resolvedModule : cf.modules()) {
385 ModuleReference mref = resolvedModule.reference();
386 String name = mref.descriptor().name();
387 ClassLoader cl = clf.apply(name);
388 if (cl == null) {
389 if (upgradeModulePath != null
390 && upgradeModulePath.find(name).isPresent())
391 fail(name + ": cannot be loaded from upgrade module path");
392 if (!systemModuleFinder.find(name).isPresent())
393 fail(name + ": cannot be loaded from application module path");
394 }
395 }
396 }
397
398 // check for split packages in the modules mapped to the built-in loaders
399 if (systemModules.hasSplitPackages() || isPatched || haveModulePath) {
400 checkSplitPackages(cf, clf);
401 }
402
403 // load/register the modules with the built-in class loaders
404 loadModules(cf, clf);
405
406 Counters.add("jdk.module.boot.5.loadModulesTime", t5);
407
408
409 // Step 6: Define all modules to the VM
410
411 long t6 = System.nanoTime();
412 ModuleLayer bootLayer = ModuleLayer.empty().defineModules(cf, clf);
413 Counters.add("jdk.module.boot.6.layerCreateTime", t6);
414
415
416 // Step 7: Miscellaneous
417
418 // check incubating status
419 if (systemModules.hasIncubatorModules() || haveModulePath) {
420 checkIncubatingStatus(cf);
421 }
422
423 // --add-reads, --add-exports/--add-opens, and --illegal-access
424 long t7 = System.nanoTime();
425 addExtraReads(bootLayer);
426 boolean extraExportsOrOpens = addExtraExportsAndOpens(bootLayer);
427 addIllegalAccess(upgradeModulePath, systemModules, bootLayer, extraExportsOrOpens);
428 Counters.add("jdk.module.boot.7.adjustModulesTime", t7);
429
430 // save module finders for later use
431 if (savedModuleFinder != null) {
432 unlimitedFinder = new SafeModuleFinder(savedModuleFinder);
433 if (savedModuleFinder != finder)
434 limitedFinder = new SafeModuleFinder(finder);
435 }
436
437 // Module graph can be archived at CDS dump time. Only allow the
438 // unnamed module case for now.
439 if (canArchive && (mainModule == null)) {
440 ArchivedModuleGraph.archive(mainModule, systemModules,
441 systemModuleFinder, cf);
442 }
443
444 // total time to initialize
445 Counters.add("jdk.module.boot.totalTime", t0);
446 Counters.publish();
447
448 return bootLayer;
449 }
450
451 /**
452 * Load/register the modules to the built-in class loaders.
453 */
454 private static void loadModules(Configuration cf,
455 Function<String, ClassLoader> clf) {
456 for (ResolvedModule resolvedModule : cf.modules()) {
457 ModuleReference mref = resolvedModule.reference();
458 String name = resolvedModule.name();
459 ClassLoader loader = clf.apply(name);
460 if (loader == null) {
461 // skip java.base as it is already loaded
462 if (!name.equals(JAVA_BASE)) {
463 BootLoader.loadModule(mref);
464 }
465 } else if (loader instanceof BuiltinClassLoader) {
466 ((BuiltinClassLoader) loader).loadModule(mref);
467 }
468 }
469 }
470
471 /**
472 * Checks for split packages between modules defined to the built-in class
473 * loaders.
474 */
475 private static void checkSplitPackages(Configuration cf,
476 Function<String, ClassLoader> clf) {
477 Map<String, String> packageToModule = new HashMap<>();
478 for (ResolvedModule resolvedModule : cf.modules()) {
479 ModuleDescriptor descriptor = resolvedModule.reference().descriptor();
480 String name = descriptor.name();
481 ClassLoader loader = clf.apply(name);
482 if (loader == null || loader instanceof BuiltinClassLoader) {
483 for (String p : descriptor.packages()) {
484 String other = packageToModule.putIfAbsent(p, name);
485 if (other != null) {
486 String msg = "Package " + p + " in both module "
487 + name + " and module " + other;
488 throw new LayerInstantiationException(msg);
489 }
490 }
491 }
492 }
493 }
494
495 /**
496 * Returns a ModuleFinder that limits observability to the given root
497 * modules, their transitive dependences, plus a set of other modules.
498 */
499 private static ModuleFinder limitFinder(ModuleFinder finder,
500 Set<String> roots,
501 Set<String> otherMods)
502 {
503 // resolve all root modules
504 Configuration cf = Configuration.empty().resolve(finder,
505 ModuleFinder.of(),
506 roots);
507
508 // module name -> reference
509 Map<String, ModuleReference> map = new HashMap<>();
510
511 // root modules and their transitive dependences
512 cf.modules().stream()
513 .map(ResolvedModule::reference)
514 .forEach(mref -> map.put(mref.descriptor().name(), mref));
515
516 // additional modules
517 otherMods.stream()
518 .map(finder::find)
519 .flatMap(Optional::stream)
520 .forEach(mref -> map.putIfAbsent(mref.descriptor().name(), mref));
521
522 // set of modules that are observable
523 Set<ModuleReference> mrefs = new HashSet<>(map.values());
524
525 return new ModuleFinder() {
526 @Override
527 public Optional<ModuleReference> find(String name) {
528 return Optional.ofNullable(map.get(name));
529 }
530 @Override
531 public Set<ModuleReference> findAll() {
532 return mrefs;
533 }
534 };
535 }
536
537 /**
538 * Creates a finder from the module path that is the value of the given
539 * system property and optionally patched by --patch-module
540 */
541 private static ModuleFinder finderFor(String prop) {
542 String s = System.getProperty(prop);
543 if (s == null) {
544 return null;
545 } else {
546 Path[] paths = Paths.pathToStrings(s).stream()
547 .map(Path::of)
548 .toArray(Path[]::new);
549 return ModulePath.of(patcher, paths);
550 }
551 }
552
553 /**
554 * Initialize the module patcher for the initial configuration passed on the
555 * value of the --patch-module options.
556 */
557 private static ModulePatcher initModulePatcher() {
558 Map<String, List<String>> map = decode("jdk.module.patch.",
559 File.pathSeparator,
560 false);
561 return new ModulePatcher(map);
562 }
563
564 /**
565 * Returns the set of module names specified by --add-module options.
566 */
567 private static Set<String> addModules() {
568 String prefix = "jdk.module.addmods.";
569 int index = 0;
570 // the system property is removed after decoding
571 String value = getAndRemoveProperty(prefix + index);
572 if (value == null) {
573 return Set.of();
574 } else {
575 Set<String> modules = new HashSet<>();
576 while (value != null) {
577 for (String s : value.split(",")) {
578 if (s.length() > 0) modules.add(s);
579 }
580 index++;
581 value = getAndRemoveProperty(prefix + index);
582 }
583 return modules;
584 }
585 }
586
587 /**
588 * Returns the set of module names specified by --limit-modules.
589 */
590 private static Set<String> limitModules() {
591 String value = getAndRemoveProperty("jdk.module.limitmods");
592 if (value == null) {
593 return Set.of();
594 } else {
595 Set<String> names = new HashSet<>();
596 for (String name : value.split(",")) {
597 if (name.length() > 0) names.add(name);
598 }
599 return names;
600 }
601 }
602
603 /**
604 * Process the --add-reads options to add any additional read edges that
605 * are specified on the command-line.
606 */
607 private static void addExtraReads(ModuleLayer bootLayer) {
608
609 // decode the command line options
610 Map<String, List<String>> map = decode("jdk.module.addreads.");
611 if (map.isEmpty())
612 return;
613
614 for (Map.Entry<String, List<String>> e : map.entrySet()) {
615
616 // the key is $MODULE
617 String mn = e.getKey();
618 Optional<Module> om = bootLayer.findModule(mn);
619 if (!om.isPresent()) {
620 warnUnknownModule(ADD_READS, mn);
621 continue;
622 }
623 Module m = om.get();
624
625 // the value is the set of other modules (by name)
626 for (String name : e.getValue()) {
627 if (ALL_UNNAMED.equals(name)) {
628 Modules.addReadsAllUnnamed(m);
629 } else {
630 om = bootLayer.findModule(name);
631 if (om.isPresent()) {
632 Modules.addReads(m, om.get());
633 } else {
634 warnUnknownModule(ADD_READS, name);
635 }
636 }
637 }
638 }
639 }
640
641 /**
642 * Process the --add-exports and --add-opens options to export/open
643 * additional packages specified on the command-line.
644 */
645 private static boolean addExtraExportsAndOpens(ModuleLayer bootLayer) {
646 boolean extraExportsOrOpens = false;
647
648 // --add-exports
649 String prefix = "jdk.module.addexports.";
650 Map<String, List<String>> extraExports = decode(prefix);
651 if (!extraExports.isEmpty()) {
652 addExtraExportsOrOpens(bootLayer, extraExports, false);
653 extraExportsOrOpens = true;
654 }
655
656
657 // --add-opens
658 prefix = "jdk.module.addopens.";
659 Map<String, List<String>> extraOpens = decode(prefix);
660 if (!extraOpens.isEmpty()) {
661 addExtraExportsOrOpens(bootLayer, extraOpens, true);
662 extraExportsOrOpens = true;
663 }
664
665 return extraExportsOrOpens;
666 }
667
668 private static void addExtraExportsOrOpens(ModuleLayer bootLayer,
669 Map<String, List<String>> map,
670 boolean opens)
671 {
672 String option = opens ? ADD_OPENS : ADD_EXPORTS;
673 for (Map.Entry<String, List<String>> e : map.entrySet()) {
674
675 // the key is $MODULE/$PACKAGE
676 String key = e.getKey();
677 String[] s = key.split("/");
678 if (s.length != 2)
679 fail(unableToParse(option, "<module>/<package>", key));
680
681 String mn = s[0];
682 String pn = s[1];
683 if (mn.isEmpty() || pn.isEmpty())
684 fail(unableToParse(option, "<module>/<package>", key));
685
686 // The exporting module is in the boot layer
687 Module m;
688 Optional<Module> om = bootLayer.findModule(mn);
689 if (!om.isPresent()) {
690 warnUnknownModule(option, mn);
691 continue;
692 }
693
694 m = om.get();
695
696 if (!m.getDescriptor().packages().contains(pn)) {
697 warn("package " + pn + " not in " + mn);
698 continue;
699 }
700
701 // the value is the set of modules to export to (by name)
702 for (String name : e.getValue()) {
703 boolean allUnnamed = false;
704 Module other = null;
705 if (ALL_UNNAMED.equals(name)) {
706 allUnnamed = true;
707 } else {
708 om = bootLayer.findModule(name);
709 if (om.isPresent()) {
710 other = om.get();
711 } else {
712 warnUnknownModule(option, name);
713 continue;
714 }
715 }
716 if (allUnnamed) {
717 if (opens) {
718 Modules.addOpensToAllUnnamed(m, pn);
719 } else {
720 Modules.addExportsToAllUnnamed(m, pn);
721 }
722 } else {
723 if (opens) {
724 Modules.addOpens(m, pn, other);
725 } else {
726 Modules.addExports(m, pn, other);
727 }
728 }
729
730 }
731 }
732 }
733
734 /**
735 * Process the --illegal-access option (and its default) to open packages
736 * of system modules in the boot layer to code in unnamed modules.
737 */
738 private static void addIllegalAccess(ModuleFinder upgradeModulePath,
739 SystemModules systemModules,
740 ModuleLayer bootLayer,
741 boolean extraExportsOrOpens) {
742 String value = getAndRemoveProperty("jdk.module.illegalAccess");
743 IllegalAccessLogger.Mode mode = IllegalAccessLogger.Mode.ONESHOT;
744 if (value != null) {
745 switch (value) {
746 case "deny":
747 return;
748 case "permit":
749 break;
750 case "warn":
751 mode = IllegalAccessLogger.Mode.WARN;
752 break;
753 case "debug":
754 mode = IllegalAccessLogger.Mode.DEBUG;
755 break;
756 default:
757 fail("Value specified to --illegal-access not recognized:"
758 + " '" + value + "'");
759 return;
760 }
761 }
762 IllegalAccessLogger.Builder builder
763 = new IllegalAccessLogger.Builder(mode, System.err);
764
765 Map<String, Set<String>> map1 = systemModules.concealedPackagesToOpen();
766 Map<String, Set<String>> map2 = systemModules.exportedPackagesToOpen();
767 if (map1.isEmpty() && map2.isEmpty()) {
768 // need to generate (exploded build)
769 IllegalAccessMaps maps = IllegalAccessMaps.generate(limitedFinder());
770 map1 = maps.concealedPackagesToOpen();
771 map2 = maps.exportedPackagesToOpen();
772 }
773
774 // open specific packages in the system modules
775 for (Module m : bootLayer.modules()) {
776 ModuleDescriptor descriptor = m.getDescriptor();
777 String name = m.getName();
778
779 // skip open modules
780 if (descriptor.isOpen()) {
781 continue;
782 }
783
784 // skip modules loaded from the upgrade module path
785 if (upgradeModulePath != null
786 && upgradeModulePath.find(name).isPresent()) {
787 continue;
788 }
789
790 Set<String> concealedPackages = map1.getOrDefault(name, Set.of());
791 Set<String> exportedPackages = map2.getOrDefault(name, Set.of());
792
793 // refresh the set of concealed and exported packages if needed
794 if (extraExportsOrOpens) {
795 concealedPackages = new HashSet<>(concealedPackages);
796 exportedPackages = new HashSet<>(exportedPackages);
797 Iterator<String> iterator = concealedPackages.iterator();
798 while (iterator.hasNext()) {
799 String pn = iterator.next();
800 if (m.isExported(pn, BootLoader.getUnnamedModule())) {
801 // concealed package is exported to ALL-UNNAMED
802 iterator.remove();
803 exportedPackages.add(pn);
804 }
805 }
806 iterator = exportedPackages.iterator();
807 while (iterator.hasNext()) {
808 String pn = iterator.next();
809 if (m.isOpen(pn, BootLoader.getUnnamedModule())) {
810 // exported package is opened to ALL-UNNAMED
811 iterator.remove();
812 }
813 }
814 }
815
816 // log reflective access to all types in concealed packages
817 builder.logAccessToConcealedPackages(m, concealedPackages);
818
819 // log reflective access to non-public members/types in exported packages
820 builder.logAccessToExportedPackages(m, exportedPackages);
821
822 // open the packages to unnamed modules
823 JavaLangAccess jla = SharedSecrets.getJavaLangAccess();
824 jla.addOpensToAllUnnamed(m, concat(concealedPackages.iterator(),
825 exportedPackages.iterator()));
826 }
827
828 builder.complete();
829 }
830
831 /**
832 * Decodes the values of --add-reads, -add-exports, --add-opens or
833 * --patch-modules options that are encoded in system properties.
834 *
835 * @param prefix the system property prefix
836 * @praam regex the regex for splitting the RHS of the option value
837 */
838 private static Map<String, List<String>> decode(String prefix,
839 String regex,
840 boolean allowDuplicates) {
841 int index = 0;
842 // the system property is removed after decoding
843 String value = getAndRemoveProperty(prefix + index);
844 if (value == null)
845 return Map.of();
846
847 Map<String, List<String>> map = new HashMap<>();
848
849 while (value != null) {
850
851 int pos = value.indexOf('=');
852 if (pos == -1)
853 fail(unableToParse(option(prefix), "<module>=<value>", value));
854 if (pos == 0)
855 fail(unableToParse(option(prefix), "<module>=<value>", value));
856
857 // key is <module> or <module>/<package>
858 String key = value.substring(0, pos);
859
860 String rhs = value.substring(pos+1);
861 if (rhs.isEmpty())
862 fail(unableToParse(option(prefix), "<module>=<value>", value));
863
864 // value is <module>(,<module>)* or <file>(<pathsep><file>)*
865 if (!allowDuplicates && map.containsKey(key))
866 fail(key + " specified more than once to " + option(prefix));
867 List<String> values = map.computeIfAbsent(key, k -> new ArrayList<>());
868 int ntargets = 0;
869 for (String s : rhs.split(regex)) {
870 if (s.length() > 0) {
871 values.add(s);
872 ntargets++;
873 }
874 }
875 if (ntargets == 0)
876 fail("Target must be specified: " + option(prefix) + " " + value);
877
878 index++;
879 value = getAndRemoveProperty(prefix + index);
880 }
881
882 return map;
883 }
884
885 /**
886 * Decodes the values of --add-reads, -add-exports or --add-opens
887 * which use the "," to separate the RHS of the option value.
888 */
889 private static Map<String, List<String>> decode(String prefix) {
890 return decode(prefix, ",", true);
891 }
892
893 /**
894 * Gets and remove the named system property
895 */
896 private static String getAndRemoveProperty(String key) {
897 return (String)System.getProperties().remove(key);
898 }
899
900 /**
901 * Checks incubating status of modules in the configuration
902 */
903 private static void checkIncubatingStatus(Configuration cf) {
904 String incubating = null;
905 for (ResolvedModule resolvedModule : cf.modules()) {
906 ModuleReference mref = resolvedModule.reference();
907
908 // emit warning if the WARN_INCUBATING module resolution bit set
909 if (ModuleResolution.hasIncubatingWarning(mref)) {
910 String mn = mref.descriptor().name();
911 if (incubating == null) {
912 incubating = mn;
913 } else {
914 incubating += ", " + mn;
915 }
916 }
917 }
918 if (incubating != null)
919 warn("Using incubator modules: " + incubating);
920 }
921
922 /**
923 * Throws a RuntimeException with the given message
924 */
925 static void fail(String m) {
926 throw new RuntimeException(m);
927 }
928
929 static void warn(String m) {
930 System.err.println("WARNING: " + m);
931 }
932
933 static void warnUnknownModule(String option, String mn) {
934 warn("Unknown module: " + mn + " specified to " + option);
935 }
936
937 static String unableToParse(String option, String text, String value) {
938 return "Unable to parse " + option + " " + text + ": " + value;
939 }
940
941 private static final String ADD_MODULES = "--add-modules";
942 private static final String ADD_EXPORTS = "--add-exports";
943 private static final String ADD_OPENS = "--add-opens";
944 private static final String ADD_READS = "--add-reads";
945 private static final String PATCH_MODULE = "--patch-module";
946
947
948 /*
949 * Returns the command-line option name corresponds to the specified
950 * system property prefix.
951 */
952 static String option(String prefix) {
953 switch (prefix) {
954 case "jdk.module.addexports.":
955 return ADD_EXPORTS;
956 case "jdk.module.addopens.":
957 return ADD_OPENS;
958 case "jdk.module.addreads.":
959 return ADD_READS;
960 case "jdk.module.patch.":
961 return PATCH_MODULE;
962 case "jdk.module.addmods.":
963 return ADD_MODULES;
964 default:
965 throw new IllegalArgumentException(prefix);
966 }
967 }
968
969 /**
970 * Returns an iterator that yields all elements of the first iterator
971 * followed by all the elements of the second iterator.
972 */
973 static <T> Iterator<T> concat(Iterator<T> iterator1, Iterator<T> iterator2) {
974 return new Iterator<T>() {
975 @Override
976 public boolean hasNext() {
977 return iterator1.hasNext() || iterator2.hasNext();
978 }
979 @Override
980 public T next() {
981 if (iterator1.hasNext()) return iterator1.next();
982 if (iterator2.hasNext()) return iterator2.next();
983 throw new NoSuchElementException();
984 }
985 };
986 }
987
988 /**
989 * Wraps a (potentially not thread safe) ModuleFinder created during startup
990 * for use after startup.
991 */
992 static class SafeModuleFinder implements ModuleFinder {
993 private final Set<ModuleReference> mrefs;
994 private volatile Map<String, ModuleReference> nameToModule;
995
996 SafeModuleFinder(ModuleFinder finder) {
997 this.mrefs = Collections.unmodifiableSet(finder.findAll());
998 }
999 @Override
1000 public Optional<ModuleReference> find(String name) {
1001 Objects.requireNonNull(name);
1002 Map<String, ModuleReference> nameToModule = this.nameToModule;
1003 if (nameToModule == null) {
1004 this.nameToModule = nameToModule = mrefs.stream()
1005 .collect(Collectors.toMap(m -> m.descriptor().name(),
1006 Function.identity()));
1007 }
1008 return Optional.ofNullable(nameToModule.get(name));
1009 }
1010 @Override
1011 public Set<ModuleReference> findAll() {
1012 return mrefs;
1013 }
1014 }
1015
1016 /**
1017 * Counters for startup performance analysis.
1018 */
1019 static class Counters {
1020 private static final boolean PUBLISH_COUNTERS;
1021 private static final boolean PRINT_COUNTERS;
1022 private static Map<String, Long> counters;
1023 static {
1024 String s = System.getProperty("jdk.module.boot.usePerfData");
1025 if (s == null) {
1026 PUBLISH_COUNTERS = false;
1027 PRINT_COUNTERS = false;
1028 } else {
1029 PUBLISH_COUNTERS = true;
1030 PRINT_COUNTERS = s.equals("debug");
1031 counters = new LinkedHashMap<>(); // preserve insert order
1032 }
1033 }
1034
1035 /**
1036 * Add a counter
1037 */
1038 static void add(String name, long start) {
1039 if (PUBLISH_COUNTERS || PRINT_COUNTERS) {
1040 counters.put(name, (System.nanoTime() - start));
1041 }
1042 }
1043
1044 /**
1045 * Publish the counters to the instrumentation buffer or stdout.
1046 */
1047 static void publish() {
1048 if (PUBLISH_COUNTERS || PRINT_COUNTERS) {
1049 for (Map.Entry<String, Long> e : counters.entrySet()) {
1050 String name = e.getKey();
1051 long value = e.getValue();
1052 if (PUBLISH_COUNTERS)
1053 PerfCounter.newPerfCounter(name).set(value);
1054 if (PRINT_COUNTERS)
1055 System.out.println(name + " = " + value);
1056 }
1057 }
1058 }
1059 }
1060 }