1 /*
2 * Copyright (c) 2022, 2026, 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.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "cds/aotClassLinker.hpp"
26 #include "cds/aotClassLocation.hpp"
27 #include "cds/aotConstantPoolResolver.hpp"
28 #include "cds/aotLogging.hpp"
29 #include "cds/archiveBuilder.hpp"
30 #include "cds/archiveUtils.inline.hpp"
31 #include "cds/cdsConfig.hpp"
32 #include "cds/finalImageRecipes.hpp"
33 #include "cds/heapShared.hpp"
34 #include "cds/lambdaFormInvokers.inline.hpp"
35 #include "classfile/classLoader.hpp"
36 #include "classfile/dictionary.hpp"
37 #include "classfile/symbolTable.hpp"
38 #include "classfile/systemDictionary.hpp"
39 #include "classfile/systemDictionaryShared.hpp"
40 #include "classfile/vmClasses.hpp"
41 #include "interpreter/bytecodeStream.hpp"
42 #include "interpreter/interpreterRuntime.hpp"
43 #include "memory/resourceArea.hpp"
44 #include "oops/constantPool.inline.hpp"
45 #include "oops/fieldStreams.inline.hpp"
46 #include "oops/instanceKlass.hpp"
47 #include "oops/klass.inline.hpp"
48 #include "runtime/handles.inline.hpp"
49 #include "runtime/javaCalls.hpp"
50 #include "runtime/signature.hpp"
51
52 // Returns true if we CAN PROVE that cp_index will always resolve to
53 // the same information at both dump time and run time. This is a
54 // necessary (but not sufficient) condition for pre-resolving cp_index
55 // during CDS archive assembly.
56 bool AOTConstantPoolResolver::is_resolution_deterministic(ConstantPool* cp, int cp_index) {
57 assert(!is_in_archivebuilder_buffer(cp), "sanity");
58
59 if (cp->tag_at(cp_index).is_klass()) {
60 // We require cp_index to be already resolved. This is fine for now, are we
61 // currently archive only CP entries that are already resolved.
62 Klass* resolved_klass = cp->resolved_klass_at(cp_index);
63 return resolved_klass != nullptr && is_class_resolution_deterministic(cp->pool_holder(), resolved_klass);
64 } else if (cp->tag_at(cp_index).is_invoke_dynamic()) {
65 return is_indy_resolution_deterministic(cp, cp_index);
66 } else if (cp->tag_at(cp_index).is_field() ||
67 cp->tag_at(cp_index).is_method() ||
68 cp->tag_at(cp_index).is_interface_method()) {
69 int klass_cp_index = cp->uncached_klass_ref_index_at(cp_index);
70 if (!cp->tag_at(klass_cp_index).is_klass()) {
71 // Not yet resolved
72 return false;
73 }
74 Klass* k = cp->resolved_klass_at(klass_cp_index);
75 if (!is_class_resolution_deterministic(cp->pool_holder(), k)) {
76 return false;
77 }
78
79 if (!k->is_instance_klass()) {
80 // TODO: support non instance klasses as well.
81 return false;
82 }
83
84 // Here, We don't check if this entry can actually be resolved to a valid Field/Method.
85 // This method should be called by the ConstantPool to check Fields/Methods that
86 // have already been successfully resolved.
87 return true;
88 } else {
89 return false;
90 }
91 }
92
93 bool AOTConstantPoolResolver::is_class_resolution_deterministic(InstanceKlass* cp_holder, Klass* resolved_class) {
94 assert(!is_in_archivebuilder_buffer(cp_holder), "sanity");
95 assert(!is_in_archivebuilder_buffer(resolved_class), "sanity");
96 assert_at_safepoint(); // try_add_candidate() is called below and requires to be at safepoint.
97
98 if (resolved_class->is_instance_klass()) {
99 InstanceKlass* ik = InstanceKlass::cast(resolved_class);
100
101 if (!ik->in_aot_cache() && SystemDictionaryShared::is_excluded_class(ik)) {
102 return false;
103 }
104
105 if (cp_holder->is_subtype_of(ik)) {
106 // All super types of ik will be resolved in ik->class_loader() before
107 // ik is defined in this loader, so it's safe to archive the resolved klass reference.
108 return true;
109 }
110
111 if (CDSConfig::is_dumping_aot_linked_classes()) {
112 // Need to call try_add_candidate instead of is_candidate, as this may be called
113 // before AOTClassLinker::add_candidates().
114 if (AOTClassLinker::try_add_candidate(ik)) {
115 return true;
116 } else {
117 return false;
118 }
119 } else if (AOTClassLinker::is_vm_class(ik)) {
120 if (ik->class_loader() != cp_holder->class_loader()) {
121 // At runtime, cp_holder() may not be able to resolve to the same
122 // ik. For example, a different version of ik may be defined in
123 // cp->pool_holder()'s loader using MethodHandles.Lookup.defineClass().
124 return false;
125 } else {
126 return true;
127 }
128 } else {
129 return false;
130 }
131 } else if (resolved_class->is_objArray_klass()) {
132 if (CDSConfig::is_dumping_dynamic_archive()) {
133 // This is difficult to handle. See JDK-8374639
134 return false;
135 }
136 Klass* elem = ObjArrayKlass::cast(resolved_class)->bottom_klass();
137 if (elem->is_instance_klass()) {
138 return is_class_resolution_deterministic(cp_holder, InstanceKlass::cast(elem));
139 } else if (elem->is_typeArray_klass()) {
140 return true;
141 } else {
142 return false;
143 }
144 } else if (resolved_class->is_typeArray_klass()) {
145 return true;
146 } else {
147 return false;
148 }
149 }
150
151 void AOTConstantPoolResolver::preresolve_string_cp_entries(InstanceKlass* ik, TRAPS) {
152 if (!ik->is_linked()) {
153 // The cp->resolved_referenced() array is not ready yet, so we can't call resolve_string().
154 return;
155 }
156 constantPoolHandle cp(THREAD, ik->constants());
157 for (int cp_index = 1; cp_index < cp->length(); cp_index++) { // Index 0 is unused
158 switch (cp->tag_at(cp_index).value()) {
159 case JVM_CONSTANT_String:
160 resolve_string(cp, cp_index, CHECK); // may throw OOM when interning strings.
161 break;
162 }
163 }
164
165 // Normally, we don't want to archive any CP entries that were not resolved
166 // in the training run. Otherwise the AOT/JIT may inline too much code that has not
167 // been executed.
168 //
169 // However, we want to aggressively resolve all klass/field/method constants for
170 // LambdaForm Invoker Holder classes, Lambda Proxy classes, and LambdaForm classes,
171 // so that the compiler can inline through them.
172 if (SystemDictionaryShared::is_builtin_loader(ik->class_loader_data())) {
173 bool eager_resolve = false;
174
175 if (LambdaFormInvokers::may_be_regenerated_class(ik->name())) {
176 eager_resolve = true;
177 }
178 if (ik->is_hidden() && HeapShared::is_archivable_hidden_klass(ik)) {
179 eager_resolve = true;
180 }
181
182 if (eager_resolve) {
183 preresolve_class_cp_entries(THREAD, ik, nullptr);
184 preresolve_field_and_method_cp_entries(THREAD, ik, nullptr);
185 }
186 }
187 }
188
189 // This works only for the boot/platform/app loaders
190 Klass* AOTConstantPoolResolver::find_loaded_class(Thread* current, oop class_loader, Symbol* name) {
191 HandleMark hm(current);
192 Handle h_loader(current, class_loader);
193 Klass* k = SystemDictionary::find_instance_or_array_klass(current, name, h_loader);
194 if (k != nullptr) {
195 return k;
196 }
197 if (h_loader() == SystemDictionary::java_system_loader()) {
198 return find_loaded_class(current, SystemDictionary::java_platform_loader(), name);
199 } else if (h_loader() == SystemDictionary::java_platform_loader()) {
200 return find_loaded_class(current, nullptr, name);
201 } else {
202 assert(h_loader() == nullptr, "This function only works for boot/platform/app loaders %p %p %p",
203 cast_from_oop<address>(h_loader()),
204 cast_from_oop<address>(SystemDictionary::java_system_loader()),
205 cast_from_oop<address>(SystemDictionary::java_platform_loader()));
206 }
207
208 return nullptr;
209 }
210
211 Klass* AOTConstantPoolResolver::find_loaded_class(Thread* current, ConstantPool* cp, int class_cp_index) {
212 Symbol* name = cp->klass_name_at(class_cp_index);
213 return find_loaded_class(current, cp->pool_holder()->class_loader(), name);
214 }
215
216 #if INCLUDE_CDS_JAVA_HEAP
217 void AOTConstantPoolResolver::resolve_string(constantPoolHandle cp, int cp_index, TRAPS) {
218 if (CDSConfig::is_dumping_heap()) {
219 int cache_index = cp->cp_to_object_index(cp_index);
220 ConstantPool::string_at_impl(cp, cp_index, cache_index, CHECK);
221 }
222 }
223 #endif
224
225 void AOTConstantPoolResolver::preresolve_class_cp_entries(JavaThread* current, InstanceKlass* ik, GrowableArray<bool>* preresolve_list) {
226 if (!SystemDictionaryShared::is_builtin_loader(ik->class_loader_data())) {
227 return;
228 }
229
230 JavaThread* THREAD = current;
231 constantPoolHandle cp(THREAD, ik->constants());
232 for (int cp_index = 1; cp_index < cp->length(); cp_index++) {
233 if (cp->tag_at(cp_index).value() == JVM_CONSTANT_UnresolvedClass) {
234 if (preresolve_list != nullptr && preresolve_list->at(cp_index) == false) {
235 // This class was not resolved during trial run. Don't attempt to resolve it. Otherwise
236 // the compiler may generate less efficient code.
237 continue;
238 }
239 if (find_loaded_class(current, cp(), cp_index) == nullptr) {
240 // Do not resolve any class that has not been loaded yet
241 continue;
242 }
243 Klass* resolved_klass = cp->klass_at(cp_index, THREAD);
244 if (HAS_PENDING_EXCEPTION) {
245 CLEAR_PENDING_EXCEPTION; // just ignore
246 } else {
247 log_trace(aot, resolve)("Resolved class [%3d] %s -> %s", cp_index, ik->external_name(),
248 resolved_klass->external_name());
249 }
250 }
251 }
252 }
253
254 void AOTConstantPoolResolver::preresolve_field_and_method_cp_entries(JavaThread* current, InstanceKlass* ik, GrowableArray<bool>* preresolve_list) {
255 JavaThread* THREAD = current;
256 constantPoolHandle cp(THREAD, ik->constants());
257 if (cp->cache() == nullptr) {
258 return;
259 }
260 for (int i = 0; i < ik->methods()->length(); i++) {
261 Method* m = ik->methods()->at(i);
262 BytecodeStream bcs(methodHandle(THREAD, m));
263 while (!bcs.is_last_bytecode()) {
264 bcs.next();
265 Bytecodes::Code raw_bc = bcs.raw_code();
266 switch (raw_bc) {
267 case Bytecodes::_getstatic:
268 case Bytecodes::_putstatic:
269 maybe_resolve_fmi_ref(ik, m, raw_bc, bcs.get_index_u2(), preresolve_list, THREAD);
270 if (HAS_PENDING_EXCEPTION) {
271 CLEAR_PENDING_EXCEPTION; // just ignore
272 }
273 break;
274 case Bytecodes::_getfield:
275 // no-fast bytecode
276 case Bytecodes::_nofast_getfield:
277 // fast bytecodes
278 case Bytecodes::_fast_agetfield:
279 case Bytecodes::_fast_bgetfield:
280 case Bytecodes::_fast_cgetfield:
281 case Bytecodes::_fast_dgetfield:
282 case Bytecodes::_fast_fgetfield:
283 case Bytecodes::_fast_igetfield:
284 case Bytecodes::_fast_lgetfield:
285 case Bytecodes::_fast_sgetfield:
286 raw_bc = Bytecodes::_getfield;
287 maybe_resolve_fmi_ref(ik, m, raw_bc, bcs.get_index_u2(), preresolve_list, THREAD);
288 if (HAS_PENDING_EXCEPTION) {
289 CLEAR_PENDING_EXCEPTION; // just ignore
290 }
291 break;
292
293 case Bytecodes::_putfield:
294 // no-fast bytecode
295 case Bytecodes::_nofast_putfield:
296 // fast bytecodes
297 case Bytecodes::_fast_aputfield:
298 case Bytecodes::_fast_bputfield:
299 case Bytecodes::_fast_zputfield:
300 case Bytecodes::_fast_cputfield:
301 case Bytecodes::_fast_dputfield:
302 case Bytecodes::_fast_fputfield:
303 case Bytecodes::_fast_iputfield:
304 case Bytecodes::_fast_lputfield:
305 case Bytecodes::_fast_sputfield:
306 raw_bc = Bytecodes::_putfield;
307 maybe_resolve_fmi_ref(ik, m, raw_bc, bcs.get_index_u2(), preresolve_list, THREAD);
308 if (HAS_PENDING_EXCEPTION) {
309 CLEAR_PENDING_EXCEPTION; // just ignore
310 }
311 break;
312 case Bytecodes::_invokehandle:
313 case Bytecodes::_invokespecial:
314 case Bytecodes::_invokevirtual:
315 case Bytecodes::_invokeinterface:
316 case Bytecodes::_invokestatic:
317 maybe_resolve_fmi_ref(ik, m, raw_bc, bcs.get_index_u2(), preresolve_list, THREAD);
318 if (HAS_PENDING_EXCEPTION) {
319 CLEAR_PENDING_EXCEPTION; // just ignore
320 }
321 break;
322 default:
323 break;
324 }
325 }
326 }
327 }
328
329 void AOTConstantPoolResolver::maybe_resolve_fmi_ref(InstanceKlass* ik, Method* m, Bytecodes::Code bc, int raw_index,
330 GrowableArray<bool>* preresolve_list, TRAPS) {
331 methodHandle mh(THREAD, m);
332 constantPoolHandle cp(THREAD, ik->constants());
333 HandleMark hm(THREAD);
334 int cp_index = cp->to_cp_index(raw_index, bc);
335
336 if (cp->is_resolved(raw_index, bc)) {
337 return;
338 }
339
340 if (preresolve_list != nullptr && preresolve_list->at(cp_index) == false) {
341 // This field wasn't resolved during the trial run. Don't attempt to resolve it. Otherwise
342 // the compiler may generate less efficient code.
343 return;
344 }
345
346 int klass_cp_index = cp->uncached_klass_ref_index_at(cp_index);
347 if (find_loaded_class(THREAD, cp(), klass_cp_index) == nullptr) {
348 // Do not resolve any field/methods from a class that has not been loaded yet.
349 return;
350 }
351
352 Klass* resolved_klass = cp->klass_ref_at(raw_index, bc, CHECK);
353 const char* is_static = "";
354
355 switch (bc) {
356 case Bytecodes::_getstatic:
357 case Bytecodes::_putstatic:
358 if (!VM_Version::supports_fast_class_init_checks()) {
359 return; // Do not resolve since interpreter lacks fast clinit barriers support
360 }
361 InterpreterRuntime::resolve_get_put(bc, raw_index, mh, cp, ClassInitMode::dont_init, CHECK);
362 is_static = " *** static";
363 break;
364
365 case Bytecodes::_getfield:
366 case Bytecodes::_putfield:
367 InterpreterRuntime::resolve_get_put(bc, raw_index, mh, cp, ClassInitMode::dont_init, CHECK);
368 break;
369
370 case Bytecodes::_invokestatic:
371 if (!VM_Version::supports_fast_class_init_checks()) {
372 return; // Do not resolve since interpreter lacks fast clinit barriers support
373 }
374 InterpreterRuntime::cds_resolve_invoke(bc, raw_index, cp, CHECK);
375 is_static = " *** static";
376 break;
377
378 case Bytecodes::_invokevirtual:
379 case Bytecodes::_invokespecial:
380 case Bytecodes::_invokeinterface:
381 InterpreterRuntime::cds_resolve_invoke(bc, raw_index, cp, CHECK);
382 break;
383
384 case Bytecodes::_invokehandle:
385 if (CDSConfig::is_dumping_method_handles()) {
386 ResolvedMethodEntry* method_entry = cp->resolved_method_entry_at(raw_index);
387 int cp_index = method_entry->constant_pool_index();
388 Symbol* sig = cp->uncached_signature_ref_at(cp_index);
389 Klass* k;
390 if (check_methodtype_signature(cp(), sig, &k, true)) {
391 InterpreterRuntime::cds_resolve_invokehandle(raw_index, cp, CHECK);
392 }
393 }
394 break;
395
396 default:
397 ShouldNotReachHere();
398 }
399
400 if (log_is_enabled(Trace, aot, resolve)) {
401 ResourceMark rm(THREAD);
402 bool resolved = cp->is_resolved(raw_index, bc);
403 Symbol* name = cp->name_ref_at(raw_index, bc);
404 Symbol* signature = cp->signature_ref_at(raw_index, bc);
405 log_trace(aot, resolve)("%s %s [%3d] %s -> %s.%s:%s%s",
406 (resolved ? "Resolved" : "Failed to resolve"),
407 Bytecodes::name(bc), cp_index, ik->external_name(),
408 resolved_klass->external_name(),
409 name->as_C_string(), signature->as_C_string(), is_static);
410 }
411 }
412
413 void AOTConstantPoolResolver::preresolve_indy_cp_entries(JavaThread* current, InstanceKlass* ik, GrowableArray<bool>* preresolve_list) {
414 JavaThread* THREAD = current;
415 constantPoolHandle cp(THREAD, ik->constants());
416 if (!CDSConfig::is_dumping_invokedynamic() || cp->cache() == nullptr) {
417 return;
418 }
419
420 assert(preresolve_list != nullptr, "preresolve_indy_cp_entries() should not be called for "
421 "regenerated LambdaForm Invoker classes, which should not have indys anyway.");
422
423 Array<ResolvedIndyEntry>* indy_entries = cp->cache()->resolved_indy_entries();
424 for (int i = 0; i < indy_entries->length(); i++) {
425 ResolvedIndyEntry* rie = indy_entries->adr_at(i);
426 int cp_index = rie->constant_pool_index();
427 if (preresolve_list->at(cp_index) == true) {
428 if (!rie->is_resolved() && is_indy_resolution_deterministic(cp(), cp_index)) {
429 InterpreterRuntime::cds_resolve_invokedynamic(i, cp, THREAD);
430 if (HAS_PENDING_EXCEPTION) {
431 CLEAR_PENDING_EXCEPTION; // just ignore
432 }
433 }
434 if (log_is_enabled(Trace, aot, resolve)) {
435 ResourceMark rm(THREAD);
436 log_trace(aot, resolve)("%s indy [%3d] %s",
437 rie->is_resolved() ? "Resolved" : "Failed to resolve",
438 cp_index, ik->external_name());
439 }
440 }
441 }
442 }
443
444 // Check the MethodType signatures used by parameters to the indy BSMs. Make sure we don't
445 // use types that have been excluded, or else we might end up creating MethodTypes that cannot be stored
446 // in the AOT cache.
447 bool AOTConstantPoolResolver::check_methodtype_signature(ConstantPool* cp, Symbol* sig, Klass** return_type_ret, bool is_invokehandle) {
448 ResourceMark rm;
449 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
450 if (ss.is_reference()) {
451 Symbol* type = ss.as_symbol();
452 Klass* k = find_loaded_class(Thread::current(), cp->pool_holder()->class_loader(), type);
453 if (k == nullptr) {
454 return false;
455 }
456
457 if (SystemDictionaryShared::should_be_excluded(k)) {
458 if (log_is_enabled(Warning, aot, resolve)) {
459 ResourceMark rm;
460 log_warning(aot, resolve)("Cannot aot-resolve %s because %s is excluded",
461 is_invokehandle ? "invokehandle" : "Lambda proxy",
462 k->external_name());
463 }
464 return false;
465 }
466
467 // cp->pool_holder() must be able to resolve k in production run
468 precond(CDSConfig::is_dumping_aot_linked_classes());
469 precond(SystemDictionaryShared::is_builtin_loader(cp->pool_holder()->class_loader_data()));
470 precond(SystemDictionaryShared::is_builtin_loader(k->class_loader_data()));
471
472 if (ss.at_return_type() && return_type_ret != nullptr) {
473 *return_type_ret = k;
474 }
475 }
476 }
477 return true;
478 }
479
480 bool AOTConstantPoolResolver::check_lambda_metafactory_signature(ConstantPool* cp, Symbol* sig) {
481 Klass* k;
482 if (!check_methodtype_signature(cp, sig, &k)) {
483 return false;
484 }
485
486 // <k> is the interface type implemented by the lambda proxy
487 if (!k->is_interface()) {
488 // cp->pool_holder() doesn't look like a valid class generated by javac
489 return false;
490 }
491
492
493 // The linked lambda callsite has an instance of the interface implemented by this lambda. If this
494 // interface requires its <clinit> to be executed, then we must delay the execution to the production run
495 // as <clinit> can have side effects ==> exclude such cases.
496 InstanceKlass* intf = InstanceKlass::cast(k);
497 bool exclude = intf->interface_needs_clinit_execution_as_super();
498 if (log_is_enabled(Debug, aot, resolve)) {
499 ResourceMark rm;
500 log_debug(aot, resolve)("%s aot-resolve Lambda proxy of interface type %s",
501 exclude ? "Cannot" : "Can", k->external_name());
502 }
503 return !exclude;
504 }
505
506 bool AOTConstantPoolResolver::check_lambda_metafactory_methodtype_arg(ConstantPool* cp, int bsms_attribute_index, int arg_i) {
507 int mt_index = cp->bsm_attribute_entry(bsms_attribute_index)->argument(arg_i);
508 if (!cp->tag_at(mt_index).is_method_type()) {
509 // malformed class?
510 return false;
511 }
512
513 Symbol* sig = cp->method_type_signature_at(mt_index);
514 if (log_is_enabled(Debug, aot, resolve)) {
515 ResourceMark rm;
516 log_debug(aot, resolve)("Checking MethodType for LambdaMetafactory BSM arg %d: %s", arg_i, sig->as_C_string());
517 }
518
519 return check_methodtype_signature(cp, sig);
520 }
521
522 bool AOTConstantPoolResolver::check_lambda_metafactory_methodhandle_arg(ConstantPool* cp, int bsms_attribute_index, int arg_i) {
523 int mh_index = cp->bsm_attribute_entry(bsms_attribute_index)->argument(arg_i);
524 if (!cp->tag_at(mh_index).is_method_handle()) {
525 // malformed class?
526 return false;
527 }
528
529 // klass and sigature of the method (no need to check the method name)
530 Symbol* sig = cp->method_handle_signature_ref_at(mh_index);
531 Symbol* klass_name = cp->klass_name_at(cp->method_handle_klass_index_at(mh_index));
532
533 if (log_is_enabled(Debug, aot, resolve)) {
534 ResourceMark rm;
535 log_debug(aot, resolve)("Checking MethodType of MethodHandle for LambdaMetafactory BSM arg %d: %s", arg_i, sig->as_C_string());
536 }
537
538 {
539 Klass* k = find_loaded_class(Thread::current(), cp->pool_holder()->class_loader(), klass_name);
540 if (k == nullptr) {
541 // Dumping AOT cache: all classes should have been loaded by FinalImageRecipes::load_all_classes(). k must have
542 // been a class that was excluded when FinalImageRecipes recorded all classes at the end of the training run.
543 //
544 // Dumping static CDS archive: all classes in the classlist have already been loaded, before we resolve
545 // constants. k must have been a class that was excluded when the classlist was written
546 // at the end of the training run.
547 if (log_is_enabled(Warning, aot, resolve)) {
548 ResourceMark rm;
549 log_warning(aot, resolve)("Cannot aot-resolve Lambda proxy because %s is not loaded", klass_name->as_C_string());
550 }
551 return false;
552 }
553 if (SystemDictionaryShared::should_be_excluded(k)) {
554 if (log_is_enabled(Warning, aot, resolve)) {
555 ResourceMark rm;
556 log_warning(aot, resolve)("Cannot aot-resolve Lambda proxy because %s is excluded", k->external_name());
557 }
558 return false;
559 }
560
561 // cp->pool_holder() must be able to resolve k in production run
562 precond(CDSConfig::is_dumping_aot_linked_classes());
563 precond(SystemDictionaryShared::is_builtin_loader(cp->pool_holder()->class_loader_data()));
564 precond(SystemDictionaryShared::is_builtin_loader(k->class_loader_data()));
565 }
566
567 return check_methodtype_signature(cp, sig);
568 }
569
570 bool AOTConstantPoolResolver::is_indy_resolution_deterministic(ConstantPool* cp, int cp_index) {
571 assert(cp->tag_at(cp_index).is_invoke_dynamic(), "sanity");
572 if (!CDSConfig::is_dumping_invokedynamic()) {
573 return false;
574 }
575
576 InstanceKlass* pool_holder = cp->pool_holder();
577 if (!SystemDictionaryShared::is_builtin(pool_holder)) {
578 return false;
579 }
580
581 int bsm = cp->bootstrap_method_ref_index_at(cp_index);
582 int bsm_ref = cp->method_handle_index_at(bsm);
583 Symbol* bsm_name = cp->uncached_name_ref_at(bsm_ref);
584 Symbol* bsm_signature = cp->uncached_signature_ref_at(bsm_ref);
585 Symbol* bsm_klass = cp->klass_name_at(cp->uncached_klass_ref_index_at(bsm_ref));
586
587 // We currently support only StringConcatFactory::makeConcatWithConstants() and LambdaMetafactory::metafactory()
588 // We should mark the allowed BSMs in the JDK code using a private annotation.
589 // See notes on RFE JDK-8342481.
590
591 if (bsm_klass->equals("java/lang/invoke/StringConcatFactory") &&
592 bsm_name->equals("makeConcatWithConstants") &&
593 bsm_signature->equals("(Ljava/lang/invoke/MethodHandles$Lookup;"
594 "Ljava/lang/String;"
595 "Ljava/lang/invoke/MethodType;"
596 "Ljava/lang/String;"
597 "[Ljava/lang/Object;"
598 ")Ljava/lang/invoke/CallSite;")) {
599 Symbol* factory_type_sig = cp->uncached_signature_ref_at(cp_index);
600 if (log_is_enabled(Debug, aot, resolve)) {
601 ResourceMark rm;
602 log_debug(aot, resolve)("Checking StringConcatFactory callsite signature [%d]: %s", cp_index, factory_type_sig->as_C_string());
603 }
604
605 Klass* k;
606 if (!check_methodtype_signature(cp, factory_type_sig, &k)) {
607 return false;
608 }
609 if (k != vmClasses::String_klass()) {
610 // bad class file?
611 return false;
612 }
613
614 return true;
615 }
616
617 if (bsm_klass->equals("java/lang/invoke/LambdaMetafactory") &&
618 bsm_name->equals("metafactory") &&
619 bsm_signature->equals("(Ljava/lang/invoke/MethodHandles$Lookup;"
620 "Ljava/lang/String;"
621 "Ljava/lang/invoke/MethodType;"
622 "Ljava/lang/invoke/MethodType;"
623 "Ljava/lang/invoke/MethodHandle;"
624 "Ljava/lang/invoke/MethodType;"
625 ")Ljava/lang/invoke/CallSite;")) {
626 /*
627 * An indy callsite is associated with the following MethodType and MethodHandles:
628 *
629 * https://github.com/openjdk/jdk/blob/580eb62dc097efeb51c76b095c1404106859b673/src/java.base/share/classes/java/lang/invoke/LambdaMetafactory.java#L293-L309
630 *
631 * MethodType factoryType The expected signature of the {@code CallSite}. The
632 * parameter types represent the types of capture variables;
633 * the return type is the interface to implement. When
634 * used with {@code invokedynamic}, this is provided by
635 * the {@code NameAndType} of the {@code InvokeDynamic}
636 *
637 * MethodType interfaceMethodType Signature and return type of method to be
638 * implemented by the function object.
639 *
640 * MethodHandle implementation A direct method handle describing the implementation
641 * method which should be called (with suitable adaptation
642 * of argument types and return types, and with captured
643 * arguments prepended to the invocation arguments) at
644 * invocation time.
645 *
646 * MethodType dynamicMethodType The signature and return type that should
647 * be enforced dynamically at invocation time.
648 * In simple use cases this is the same as
649 * {@code interfaceMethodType}.
650 */
651 Symbol* factory_type_sig = cp->uncached_signature_ref_at(cp_index);
652 if (log_is_enabled(Debug, aot, resolve)) {
653 ResourceMark rm;
654 log_debug(aot, resolve)("Checking lambda callsite signature [%d]: %s", cp_index, factory_type_sig->as_C_string());
655 }
656
657 if (!check_lambda_metafactory_signature(cp, factory_type_sig)) {
658 return false;
659 }
660
661 int bsms_attribute_index = cp->bootstrap_methods_attribute_index(cp_index);
662 int arg_count = cp->bsm_attribute_entry(bsms_attribute_index)->argument_count();
663 if (arg_count != 3) {
664 // Malformed class?
665 return false;
666 }
667
668 // interfaceMethodType
669 if (!check_lambda_metafactory_methodtype_arg(cp, bsms_attribute_index, 0)) {
670 return false;
671 }
672
673 // implementation
674 if (!check_lambda_metafactory_methodhandle_arg(cp, bsms_attribute_index, 1)) {
675 return false;
676 }
677
678 // dynamicMethodType
679 if (!check_lambda_metafactory_methodtype_arg(cp, bsms_attribute_index, 2)) {
680 return false;
681 }
682
683 return true;
684 }
685
686 return false;
687 }
688 #ifdef ASSERT
689 bool AOTConstantPoolResolver::is_in_archivebuilder_buffer(address p) {
690 if (!Thread::current()->is_VM_thread() || ArchiveBuilder::current() == nullptr) {
691 return false;
692 } else {
693 return ArchiveBuilder::current()->is_in_buffer_space(p);
694 }
695 }
696 #endif
697
698 // Paranoid check -- if any field/method signature in <ik> is referencing a class that is known to be
699 // excluded, do not archive any reflection data in <ik>.
700 bool AOTConstantPoolResolver::check_signature_for_reflection_data(InstanceKlass* ik, Symbol* sig, bool is_method) {
701 precond(SafepointSynchronize::is_at_safepoint());
702 ResourceMark rm;
703 for (SignatureStream ss(sig, is_method); !ss.is_done(); ss.next()) {
704 if (ss.is_reference()) {
705 Symbol* klass_name = ss.as_symbol(/*probe_only=*/true);
706 if (klass_name == nullptr) {
707 // This symbol has never been created during the assembly phase, so it can't
708 // possibly be referencing an excluded class.
709 continue;
710 }
711 if (Signature::is_array(klass_name)) {
712 SignatureStream ss2(klass_name, false);
713 ss2.skip_array_prefix();
714 if (ss2.is_reference() && ss2.as_symbol(/*probe_only=*/true) == nullptr) {
715 // klass_name is an array klass that has not been loaded during the assembly phase, so it can't
716 // possibly be referencing an excluded class.
717 continue;
718 }
719 }
720 Klass* k = find_loaded_class(Thread::current(), ik->class_loader(), klass_name);
721 if (k == nullptr) {
722 // No class of this name has been loaded for this loader, so this name can't
723 // possibly be referencing an excluded class.
724 continue;
725 }
726 if (SystemDictionaryShared::should_be_excluded(k)) {
727 if (log_is_enabled(Warning, aot, resolve)) {
728 ResourceMark rm;
729 log_warning(aot, resolve)("Cannot archive reflection data in %s because it refers to excluded class %s",
730 ik->external_name(), k->external_name());
731 }
732 return false;
733 }
734 }
735 }
736 return true;
737 }
738
739 bool AOTConstantPoolResolver::can_archive_reflection_data_declared_fields(InstanceKlass* ik) {
740 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
741 if (!check_signature_for_reflection_data(ik, fs.signature(), /*is_method=*/false)) {
742 return false;
743 }
744 }
745
746 return true;
747 }
748
749 bool AOTConstantPoolResolver::can_archive_reflection_data_declared_methods(InstanceKlass* ik) {
750 Array<Method*>* methods = ik->methods();
751 for (int i = 0; i < methods->length(); i++) {
752 Method* m = methods->at(i);
753 if (!check_signature_for_reflection_data(ik, m->signature(), /*is_method=*/true)) {
754 return false;
755 }
756 }
757
758 return true;
759 }
760
761 // This is called by AOT assembly phase to see if java_lang_Class::reflection_data(k) can be
762 // archived.
763 bool AOTConstantPoolResolver::can_archive_reflection_data(InstanceKlass* ik) {
764 // At this point, we have resolved the reflection data of *all* classes
765 // recorded by FinalImageRecipes.
766 // When we are in the AOT safepoint, we will archive the reflection
767 // data of <ik> *only if* it doesn't reference any excluded classes.
768 precond(SafepointSynchronize::is_at_safepoint());
769
770 if (!can_archive_reflection_data_declared_fields(ik)) {
771 return false;
772 }
773 if (!can_archive_reflection_data_declared_methods(ik)) {
774 return false;
775 }
776
777 if (log_is_enabled(Info, aot, resolve)) {
778 ResourceMark rm;
779 log_info(aot, resolve)("Archived reflection data in %s", ik->external_name());
780 }
781
782 return true;
783 }
784
785 int AOTConstantPoolResolver::class_reflection_data_flags(InstanceKlass* ik, TRAPS) {
786 assert(java_lang_Class::has_reflection_data(ik->java_mirror()), "must be");
787
788 HandleMark hm(THREAD);
789 JavaCallArguments args(Handle(THREAD, ik->java_mirror()));
790 JavaValue result(T_INT);
791 JavaCalls::call_special(&result,
792 vmClasses::Class_klass(),
793 vmSymbols::encodeReflectionData_name(),
794 vmSymbols::void_int_signature(),
795 &args, CHECK_0);
796 int flags = result.get_jint();
797 aot_log_info(aot)("Encode ReflectionData: %s (flags=0x%x)", ik->external_name(), flags);
798 return flags;
799 }
800
801 void AOTConstantPoolResolver::generate_reflection_data(JavaThread* current, InstanceKlass* ik, int rd_flags) {
802 aot_log_info(aot)("Generate ReflectionData: %s (flags=" INT32_FORMAT_X ")", ik->external_name(), rd_flags);
803 JavaThread* THREAD = current; // for exception macros
804 JavaCallArguments args(Handle(THREAD, ik->java_mirror()));
805 args.push_int(rd_flags);
806 JavaValue result(T_OBJECT);
807 JavaCalls::call_special(&result,
808 vmClasses::Class_klass(),
809 vmSymbols::generateReflectionData_name(),
810 vmSymbols::int_void_signature(),
811 &args, THREAD);
812 if (HAS_PENDING_EXCEPTION) {
813 Handle exc_handle(THREAD, PENDING_EXCEPTION);
814 CLEAR_PENDING_EXCEPTION;
815
816 log_warning(aot)("Exception during Class::generateReflectionData() call for %s", ik->external_name());
817 LogStreamHandle(Debug, aot) log;
818 if (log.is_enabled()) {
819 java_lang_Throwable::print_stack_trace(exc_handle, &log);
820 }
821 }
822 }
823
824 Klass* AOTConstantPoolResolver::resolve_boot_class_or_fail(const char* class_name, TRAPS) {
825 Handle class_loader;
826 TempNewSymbol class_name_sym = SymbolTable::new_symbol(class_name);
827 return SystemDictionary::resolve_or_fail(class_name_sym, class_loader, true, THREAD);
828 }
829
830 void AOTConstantPoolResolver::trace_dynamic_proxy_class(oop loader, const char* proxy_name, objArrayOop interfaces, int access_flags) {
831 if (interfaces->length() < 1) {
832 return;
833 }
834 if (CDSConfig::is_dumping_preimage_static_archive()) {
835 FinalImageRecipes::add_dynamic_proxy_class(loader, proxy_name, interfaces, access_flags);
836 }
837 }
838
839 void AOTConstantPoolResolver::init_dynamic_proxy_cache(TRAPS) {
840 static bool inited = false;
841 if (inited) {
842 return;
843 }
844 inited = true;
845
846 Klass* klass = resolve_boot_class_or_fail("java/lang/reflect/Proxy", CHECK);
847 TempNewSymbol method = SymbolTable::new_symbol("initCacheForCDS");
848 TempNewSymbol signature = SymbolTable::new_symbol("(Ljava/lang/ClassLoader;Ljava/lang/ClassLoader;)V");
849
850 JavaCallArguments args;
851 args.push_oop(Handle(THREAD, SystemDictionary::java_platform_loader()));
852 args.push_oop(Handle(THREAD, SystemDictionary::java_system_loader()));
853 JavaValue result(T_VOID);
854 JavaCalls::call_static(&result,
855 klass,
856 method,
857 signature,
858 &args, CHECK);
859 }
860
861
862 void AOTConstantPoolResolver::define_dynamic_proxy_class(Handle loader, Handle proxy_name, Handle interfaces, int access_flags, TRAPS) {
863 if (!CDSConfig::is_dumping_dynamic_proxies()) {
864 return;
865 }
866 init_dynamic_proxy_cache(CHECK);
867
868 Klass* klass = resolve_boot_class_or_fail("java/lang/reflect/Proxy$ProxyBuilder", CHECK);
869 TempNewSymbol method = SymbolTable::new_symbol("defineProxyClassForCDS");
870 TempNewSymbol signature = SymbolTable::new_symbol("(Ljava/lang/ClassLoader;Ljava/lang/String;[Ljava/lang/Class;I)Ljava/lang/Class;");
871
872 JavaCallArguments args;
873 args.push_oop(Handle(THREAD, loader()));
874 args.push_oop(Handle(THREAD, proxy_name()));
875 args.push_oop(Handle(THREAD, interfaces()));
876 args.push_int(access_flags);
877 JavaValue result(T_OBJECT);
878 JavaCalls::call_static(&result,
879 klass,
880 method,
881 signature,
882 &args, CHECK);
883
884 // Assumptions:
885 // FMG is archived, which means -modulepath and -Xbootclasspath are both not specified.
886 // All named modules are loaded from the system modules files.
887 // TODO: test support for -Xbootclasspath after JDK-8322322. Some of the code below need to be changed.
888 // TODO: we just give dummy shared_classpath_index for the generated class so that it will be archived.
889 // The index is not used at runtime (see SystemDictionaryShared::load_shared_class_for_builtin_loader, which
890 // uses a null ProtectionDomain for this class)
891 oop mirror = result.get_oop();
892 assert(mirror != nullptr, "class must have been generated if not OOM");
893 InstanceKlass* ik = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
894 if (ik->defined_by_boot_loader() || ik->defined_by_platform_loader()) {
895 assert(ik->module()->is_named(), "dynamic proxies defined in unnamed modules for boot/platform loaders not supported");
896 ik->set_shared_classpath_index(0);
897 } else {
898 assert(ik->defined_by_app_loader(), "must be");
899 ik->set_shared_classpath_index(AOTClassLocationConfig::dumptime()->app_cp_start_index());
900 }
901
902 ArchiveBuilder::alloc_stats()->record_dynamic_proxy_class();
903 if (log_is_enabled(Info, cds, dynamic, proxy)) {
904 ResourceMark rm(THREAD);
905 stringStream ss;
906 const char* prefix = "";
907 ss.print("%s (%-7s, cp index = %d) implements ", ik->external_name(),
908 ArchiveUtils::builtin_loader_name(loader()), ik->shared_classpath_index());
909 objArrayOop intfs = (objArrayOop)interfaces();
910 for (int i = 0; i < intfs->length(); i++) {
911 oop intf_mirror = intfs->obj_at(i);
912 ss.print("%s%s", prefix, java_lang_Class::as_Klass(intf_mirror)->external_name());
913 prefix = ", ";
914 }
915
916 log_info(cds, dynamic, proxy)("%s", ss.freeze());
917 }
918 }