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/classListWriter.hpp"
33 #include "cds/finalImageRecipes.hpp"
34 #include "cds/heapShared.hpp"
35 #include "cds/lambdaFormInvokers.inline.hpp"
36 #include "classfile/classLoader.hpp"
37 #include "classfile/dictionary.hpp"
38 #include "classfile/symbolTable.hpp"
39 #include "classfile/systemDictionary.hpp"
40 #include "classfile/systemDictionaryShared.hpp"
41 #include "classfile/vmClasses.hpp"
42 #include "interpreter/bytecodeStream.hpp"
43 #include "interpreter/interpreterRuntime.hpp"
44 #include "memory/resourceArea.hpp"
45 #include "oops/constantPool.inline.hpp"
46 #include "oops/fieldStreams.inline.hpp"
47 #include "oops/instanceKlass.hpp"
48 #include "oops/klass.inline.hpp"
49 #include "runtime/handles.inline.hpp"
50 #include "runtime/javaCalls.hpp"
51 #include "runtime/signature.hpp"
52
53 // Returns true if we CAN PROVE that cp_index will always resolve to
54 // the same information at both dump time and run time. This is a
55 // necessary (but not sufficient) condition for pre-resolving cp_index
56 // during CDS archive assembly.
57 bool AOTConstantPoolResolver::is_resolution_deterministic(ConstantPool* cp, int cp_index) {
58 assert(!is_in_archivebuilder_buffer(cp), "sanity");
59
60 if (cp->tag_at(cp_index).is_klass()) {
61 // We require cp_index to be already resolved. This is fine for now, are we
62 // currently archive only CP entries that are already resolved.
63 Klass* resolved_klass = cp->resolved_klass_at(cp_index);
64 return resolved_klass != nullptr && is_class_resolution_deterministic(cp->pool_holder(), resolved_klass);
65 } else if (cp->tag_at(cp_index).is_invoke_dynamic()) {
66 return is_indy_resolution_deterministic(cp, cp_index);
67 } else if (cp->tag_at(cp_index).is_field() ||
68 cp->tag_at(cp_index).is_method() ||
69 cp->tag_at(cp_index).is_interface_method()) {
70 int klass_cp_index = cp->uncached_klass_ref_index_at(cp_index);
71 if (!cp->tag_at(klass_cp_index).is_klass()) {
72 // Not yet resolved
73 return false;
74 }
75 Klass* k = cp->resolved_klass_at(klass_cp_index);
76 if (!is_class_resolution_deterministic(cp->pool_holder(), k)) {
77 return false;
78 }
79
80 if (!k->is_instance_klass()) {
81 // TODO: support non instance klasses as well.
82 return false;
83 }
84
85 // Here, We don't check if this entry can actually be resolved to a valid Field/Method.
86 // This method should be called by the ConstantPool to check Fields/Methods that
87 // have already been successfully resolved.
88 return true;
89 } else {
90 return false;
91 }
92 }
93
94 bool AOTConstantPoolResolver::is_class_resolution_deterministic(InstanceKlass* cp_holder, Klass* resolved_class) {
95 assert(!is_in_archivebuilder_buffer(cp_holder), "sanity");
96 assert(!is_in_archivebuilder_buffer(resolved_class), "sanity");
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 InterpreterRuntime::cds_resolve_invokehandle(raw_index, cp, CHECK);
386 break;
387
388 default:
389 ShouldNotReachHere();
390 }
391
392 if (log_is_enabled(Trace, aot, resolve)) {
393 ResourceMark rm(THREAD);
394 bool resolved = cp->is_resolved(raw_index, bc);
395 Symbol* name = cp->name_ref_at(raw_index, bc);
396 Symbol* signature = cp->signature_ref_at(raw_index, bc);
397 log_trace(aot, resolve)("%s %s [%3d] %s -> %s.%s:%s%s",
398 (resolved ? "Resolved" : "Failed to resolve"),
399 Bytecodes::name(bc), cp_index, ik->external_name(),
400 resolved_klass->external_name(),
401 name->as_C_string(), signature->as_C_string(), is_static);
402 }
403 }
404
405 void AOTConstantPoolResolver::preresolve_indy_cp_entries(JavaThread* current, InstanceKlass* ik, GrowableArray<bool>* preresolve_list) {
406 JavaThread* THREAD = current;
407 constantPoolHandle cp(THREAD, ik->constants());
408 if (!CDSConfig::is_dumping_invokedynamic() || cp->cache() == nullptr) {
409 return;
410 }
411
412 assert(preresolve_list != nullptr, "preresolve_indy_cp_entries() should not be called for "
413 "regenerated LambdaForm Invoker classes, which should not have indys anyway.");
414
415 Array<ResolvedIndyEntry>* indy_entries = cp->cache()->resolved_indy_entries();
416 for (int i = 0; i < indy_entries->length(); i++) {
417 ResolvedIndyEntry* rie = indy_entries->adr_at(i);
418 int cp_index = rie->constant_pool_index();
419 if (preresolve_list->at(cp_index) == true) {
420 if (!rie->is_resolved() && is_indy_resolution_deterministic(cp(), cp_index)) {
421 InterpreterRuntime::cds_resolve_invokedynamic(i, cp, THREAD);
422 if (HAS_PENDING_EXCEPTION) {
423 CLEAR_PENDING_EXCEPTION; // just ignore
424 }
425 }
426 if (log_is_enabled(Trace, aot, resolve)) {
427 ResourceMark rm(THREAD);
428 log_trace(aot, resolve)("%s indy [%3d] %s",
429 rie->is_resolved() ? "Resolved" : "Failed to resolve",
430 cp_index, ik->external_name());
431 }
432 }
433 }
434 }
435
436 // Check the MethodType signatures used by parameters to the indy BSMs. Make sure we don't
437 // use types that have been excluded, or else we might end up creating MethodTypes that cannot be stored
438 // in the AOT cache.
439 bool AOTConstantPoolResolver::check_methodtype_signature(ConstantPool* cp, Symbol* sig, Klass** return_type_ret) {
440 ResourceMark rm;
441 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
442 if (ss.is_reference()) {
443 Symbol* type = ss.as_symbol();
444 Klass* k = find_loaded_class(Thread::current(), cp->pool_holder()->class_loader(), type);
445 if (k == nullptr) {
446 return false;
447 }
448
449 if (SystemDictionaryShared::should_be_excluded(k)) {
450 if (log_is_enabled(Warning, aot, resolve)) {
451 ResourceMark rm;
452 log_warning(aot, resolve)("Cannot aot-resolve Lambda proxy because %s is excluded", k->external_name());
453 }
454 return false;
455 }
456
457 if (ss.at_return_type() && return_type_ret != nullptr) {
458 *return_type_ret = k;
459 }
460 }
461 }
462 return true;
463 }
464
465 bool AOTConstantPoolResolver::check_lambda_metafactory_signature(ConstantPool* cp, Symbol* sig) {
466 Klass* k;
467 if (!check_methodtype_signature(cp, sig, &k)) {
468 return false;
469 }
470
471 // <k> is the interface type implemented by the lambda proxy
472 if (!k->is_interface()) {
473 // cp->pool_holder() doesn't look like a valid class generated by javac
474 return false;
475 }
476
477
478 // The linked lambda callsite has an instance of the interface implemented by this lambda. If this
479 // interface requires its <clinit> to be executed, then we must delay the execution to the production run
480 // as <clinit> can have side effects ==> exclude such cases.
481 InstanceKlass* intf = InstanceKlass::cast(k);
482 bool exclude = intf->interface_needs_clinit_execution_as_super();
483 if (log_is_enabled(Debug, aot, resolve)) {
484 ResourceMark rm;
485 log_debug(aot, resolve)("%s aot-resolve Lambda proxy of interface type %s",
486 exclude ? "Cannot" : "Can", k->external_name());
487 }
488 return !exclude;
489 }
490
491 bool AOTConstantPoolResolver::check_lambda_metafactory_methodtype_arg(ConstantPool* cp, int bsms_attribute_index, int arg_i) {
492 int mt_index = cp->bsm_attribute_entry(bsms_attribute_index)->argument(arg_i);
493 if (!cp->tag_at(mt_index).is_method_type()) {
494 // malformed class?
495 return false;
496 }
497
498 Symbol* sig = cp->method_type_signature_at(mt_index);
499 if (log_is_enabled(Debug, aot, resolve)) {
500 ResourceMark rm;
501 log_debug(aot, resolve)("Checking MethodType for LambdaMetafactory BSM arg %d: %s", arg_i, sig->as_C_string());
502 }
503
504 return check_methodtype_signature(cp, sig);
505 }
506
507 bool AOTConstantPoolResolver::check_lambda_metafactory_methodhandle_arg(ConstantPool* cp, int bsms_attribute_index, int arg_i) {
508 int mh_index = cp->bsm_attribute_entry(bsms_attribute_index)->argument(arg_i);
509 if (!cp->tag_at(mh_index).is_method_handle()) {
510 // malformed class?
511 return false;
512 }
513
514 Symbol* sig = cp->method_handle_signature_ref_at(mh_index);
515 if (log_is_enabled(Debug, aot, resolve)) {
516 ResourceMark rm;
517 log_debug(aot, resolve)("Checking MethodType of MethodHandle for LambdaMetafactory BSM arg %d: %s", arg_i, sig->as_C_string());
518 }
519 return check_methodtype_signature(cp, sig);
520 }
521
522 bool AOTConstantPoolResolver::is_indy_resolution_deterministic(ConstantPool* cp, int cp_index) {
523 assert(cp->tag_at(cp_index).is_invoke_dynamic(), "sanity");
524 if (!CDSConfig::is_dumping_invokedynamic()) {
525 return false;
526 }
527
528 InstanceKlass* pool_holder = cp->pool_holder();
529 if (!SystemDictionaryShared::is_builtin(pool_holder)) {
530 return false;
531 }
532
533 int bsm = cp->bootstrap_method_ref_index_at(cp_index);
534 int bsm_ref = cp->method_handle_index_at(bsm);
535 Symbol* bsm_name = cp->uncached_name_ref_at(bsm_ref);
536 Symbol* bsm_signature = cp->uncached_signature_ref_at(bsm_ref);
537 Symbol* bsm_klass = cp->klass_name_at(cp->uncached_klass_ref_index_at(bsm_ref));
538
539 // We currently support only StringConcatFactory::makeConcatWithConstants() and LambdaMetafactory::metafactory()
540 // We should mark the allowed BSMs in the JDK code using a private annotation.
541 // See notes on RFE JDK-8342481.
542
543 if (bsm_klass->equals("java/lang/invoke/StringConcatFactory") &&
544 bsm_name->equals("makeConcatWithConstants") &&
545 bsm_signature->equals("(Ljava/lang/invoke/MethodHandles$Lookup;"
546 "Ljava/lang/String;"
547 "Ljava/lang/invoke/MethodType;"
548 "Ljava/lang/String;"
549 "[Ljava/lang/Object;"
550 ")Ljava/lang/invoke/CallSite;")) {
551 Symbol* factory_type_sig = cp->uncached_signature_ref_at(cp_index);
552 if (log_is_enabled(Debug, aot, resolve)) {
553 ResourceMark rm;
554 log_debug(aot, resolve)("Checking StringConcatFactory callsite signature [%d]: %s", cp_index, factory_type_sig->as_C_string());
555 }
556
557 Klass* k;
558 if (!check_methodtype_signature(cp, factory_type_sig, &k)) {
559 return false;
560 }
561 if (k != vmClasses::String_klass()) {
562 // bad class file?
563 return false;
564 }
565
566 return true;
567 }
568
569 if (bsm_klass->equals("java/lang/invoke/LambdaMetafactory") &&
570 bsm_name->equals("metafactory") &&
571 bsm_signature->equals("(Ljava/lang/invoke/MethodHandles$Lookup;"
572 "Ljava/lang/String;"
573 "Ljava/lang/invoke/MethodType;"
574 "Ljava/lang/invoke/MethodType;"
575 "Ljava/lang/invoke/MethodHandle;"
576 "Ljava/lang/invoke/MethodType;"
577 ")Ljava/lang/invoke/CallSite;")) {
578 /*
579 * An indy callsite is associated with the following MethodType and MethodHandles:
580 *
581 * https://github.com/openjdk/jdk/blob/580eb62dc097efeb51c76b095c1404106859b673/src/java.base/share/classes/java/lang/invoke/LambdaMetafactory.java#L293-L309
582 *
583 * MethodType factoryType The expected signature of the {@code CallSite}. The
584 * parameter types represent the types of capture variables;
585 * the return type is the interface to implement. When
586 * used with {@code invokedynamic}, this is provided by
587 * the {@code NameAndType} of the {@code InvokeDynamic}
588 *
589 * MethodType interfaceMethodType Signature and return type of method to be
590 * implemented by the function object.
591 *
592 * MethodHandle implementation A direct method handle describing the implementation
593 * method which should be called (with suitable adaptation
594 * of argument types and return types, and with captured
595 * arguments prepended to the invocation arguments) at
596 * invocation time.
597 *
598 * MethodType dynamicMethodType The signature and return type that should
599 * be enforced dynamically at invocation time.
600 * In simple use cases this is the same as
601 * {@code interfaceMethodType}.
602 */
603 Symbol* factory_type_sig = cp->uncached_signature_ref_at(cp_index);
604 if (log_is_enabled(Debug, aot, resolve)) {
605 ResourceMark rm;
606 log_debug(aot, resolve)("Checking lambda callsite signature [%d]: %s", cp_index, factory_type_sig->as_C_string());
607 }
608
609 if (!check_lambda_metafactory_signature(cp, factory_type_sig)) {
610 return false;
611 }
612
613 int bsms_attribute_index = cp->bootstrap_methods_attribute_index(cp_index);
614 int arg_count = cp->bsm_attribute_entry(bsms_attribute_index)->argument_count();
615 if (arg_count != 3) {
616 // Malformed class?
617 return false;
618 }
619
620 // interfaceMethodType
621 if (!check_lambda_metafactory_methodtype_arg(cp, bsms_attribute_index, 0)) {
622 return false;
623 }
624
625 // implementation
626 if (!check_lambda_metafactory_methodhandle_arg(cp, bsms_attribute_index, 1)) {
627 return false;
628 }
629
630 // dynamicMethodType
631 if (!check_lambda_metafactory_methodtype_arg(cp, bsms_attribute_index, 2)) {
632 return false;
633 }
634
635 return true;
636 }
637
638 return false;
639 }
640 #ifdef ASSERT
641 bool AOTConstantPoolResolver::is_in_archivebuilder_buffer(address p) {
642 if (!Thread::current()->is_VM_thread() || ArchiveBuilder::current() == nullptr) {
643 return false;
644 } else {
645 return ArchiveBuilder::current()->is_in_buffer_space(p);
646 }
647 }
648 #endif
649
650 // Paranoid check -- if any field/method signature in <ik> is referencing a class that is known to be
651 // excluded, do not archive any reflection data in <ik>.
652 bool AOTConstantPoolResolver::check_signature_for_reflection_data(InstanceKlass* ik, Symbol* sig, bool is_method) {
653 precond(SafepointSynchronize::is_at_safepoint());
654 ResourceMark rm;
655 for (SignatureStream ss(sig, is_method); !ss.is_done(); ss.next()) {
656 if (ss.is_reference()) {
657 Symbol* klass_name = ss.as_symbol(/*probe_only=*/true);
658 if (klass_name == nullptr) {
659 // This symbol has never been created during the assembly phase, so it can't
660 // possibly be referencing an excluded class.
661 continue;
662 }
663 if (Signature::is_array(klass_name)) {
664 SignatureStream ss2(klass_name, false);
665 ss2.skip_array_prefix();
666 if (ss2.is_reference() && ss2.as_symbol(/*probe_only=*/true) == nullptr) {
667 // klass_name is an array klass that has not been loaded during the assembly phase, so it can't
668 // possibly be referencing an excluded class.
669 continue;
670 }
671 }
672 Klass* k = find_loaded_class(Thread::current(), ik->class_loader(), klass_name);
673 if (k == nullptr) {
674 // No class of this name has been loaded for this loader, so this name can't
675 // possibly be referencing an excluded class.
676 continue;
677 }
678 if (SystemDictionaryShared::should_be_excluded(k)) {
679 if (log_is_enabled(Warning, aot, resolve)) {
680 ResourceMark rm;
681 log_warning(aot, resolve)("Cannot archive reflection data in %s because it refers to excluded class %s",
682 ik->external_name(), k->external_name());
683 }
684 return false;
685 }
686 }
687 }
688 return true;
689 }
690
691 bool AOTConstantPoolResolver::can_archive_reflection_data_declared_fields(InstanceKlass* ik) {
692 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
693 if (!check_signature_for_reflection_data(ik, fs.signature(), /*is_method=*/false)) {
694 return false;
695 }
696 }
697
698 return true;
699 }
700
701 bool AOTConstantPoolResolver::can_archive_reflection_data_declared_methods(InstanceKlass* ik) {
702 Array<Method*>* methods = ik->methods();
703 for (int i = 0; i < methods->length(); i++) {
704 Method* m = methods->at(i);
705 if (!check_signature_for_reflection_data(ik, m->signature(), /*is_method=*/true)) {
706 return false;
707 }
708 }
709
710 return true;
711 }
712
713 // This is called by AOT assembly phase to see if java_lang_Class::reflection_data(k) can be
714 // archived.
715 bool AOTConstantPoolResolver::can_archive_reflection_data(InstanceKlass* ik) {
716 // At this point, we have resolved the reflection data of *all* classes
717 // recorded by FinalImageRecipes.
718 // When we are in the AOT safepoint, we will archive the reflection
719 // data of <ik> *only if* it doesn't reference any excluded classes.
720 precond(SafepointSynchronize::is_at_safepoint());
721
722 if (!can_archive_reflection_data_declared_fields(ik)) {
723 return false;
724 }
725 if (!can_archive_reflection_data_declared_methods(ik)) {
726 return false;
727 }
728
729 if (log_is_enabled(Info, aot, resolve)) {
730 ResourceMark rm;
731 log_info(aot, resolve)("Archived reflection data in %s", ik->external_name());
732 }
733
734 return true;
735 }
736
737 int AOTConstantPoolResolver::class_reflection_data_flags(InstanceKlass* ik, TRAPS) {
738 assert(java_lang_Class::has_reflection_data(ik->java_mirror()), "must be");
739
740 HandleMark hm(THREAD);
741 JavaCallArguments args(Handle(THREAD, ik->java_mirror()));
742 JavaValue result(T_INT);
743 JavaCalls::call_special(&result,
744 vmClasses::Class_klass(),
745 vmSymbols::encodeReflectionData_name(),
746 vmSymbols::void_int_signature(),
747 &args, CHECK_0);
748 int flags = result.get_jint();
749 aot_log_info(aot)("Encode ReflectionData: %s (flags=0x%x)", ik->external_name(), flags);
750 return flags;
751 }
752
753 void AOTConstantPoolResolver::generate_reflection_data(JavaThread* current, InstanceKlass* ik, int rd_flags) {
754 aot_log_info(aot)("Generate ReflectionData: %s (flags=" INT32_FORMAT_X ")", ik->external_name(), rd_flags);
755 JavaThread* THREAD = current; // for exception macros
756 JavaCallArguments args(Handle(THREAD, ik->java_mirror()));
757 args.push_int(rd_flags);
758 JavaValue result(T_OBJECT);
759 JavaCalls::call_special(&result,
760 vmClasses::Class_klass(),
761 vmSymbols::generateReflectionData_name(),
762 vmSymbols::int_void_signature(),
763 &args, THREAD);
764 if (HAS_PENDING_EXCEPTION) {
765 Handle exc_handle(THREAD, PENDING_EXCEPTION);
766 CLEAR_PENDING_EXCEPTION;
767
768 log_warning(aot)("Exception during Class::generateReflectionData() call for %s", ik->external_name());
769 LogStreamHandle(Debug, aot) log;
770 if (log.is_enabled()) {
771 java_lang_Throwable::print_stack_trace(exc_handle, &log);
772 }
773 }
774 }
775
776 Klass* AOTConstantPoolResolver::resolve_boot_class_or_fail(const char* class_name, TRAPS) {
777 Handle class_loader;
778 TempNewSymbol class_name_sym = SymbolTable::new_symbol(class_name);
779 return SystemDictionary::resolve_or_fail(class_name_sym, class_loader, true, THREAD);
780 }
781
782 void AOTConstantPoolResolver::trace_dynamic_proxy_class(oop loader, const char* proxy_name, objArrayOop interfaces, int access_flags) {
783 if (interfaces->length() < 1) {
784 return;
785 }
786 if (ClassListWriter::is_enabled()) {
787 const char* loader_name = ArchiveUtils::builtin_loader_name_or_null(loader);
788 if (loader_name != nullptr) {
789 stringStream ss;
790 ss.print("%s %s %d %d", loader_name, proxy_name, access_flags, interfaces->length());
791 for (int i = 0; i < interfaces->length(); i++) {
792 oop mirror = interfaces->obj_at(i);
793 Klass* k = java_lang_Class::as_Klass(mirror);
794 ss.print(" %s", k->name()->as_C_string());
795 }
796 ClassListWriter w; // This locks ClassListFile_lock
797 w.stream()->print_cr("@dynamic-proxy %s", ss.freeze());
798 }
799 }
800 if (CDSConfig::is_dumping_preimage_static_archive()) {
801 FinalImageRecipes::add_dynamic_proxy_class(loader, proxy_name, interfaces, access_flags);
802 }
803 }
804
805 void AOTConstantPoolResolver::init_dynamic_proxy_cache(TRAPS) {
806 static bool inited = false;
807 if (inited) {
808 return;
809 }
810 inited = true;
811
812 Klass* klass = resolve_boot_class_or_fail("java/lang/reflect/Proxy", CHECK);
813 TempNewSymbol method = SymbolTable::new_symbol("initCacheForCDS");
814 TempNewSymbol signature = SymbolTable::new_symbol("(Ljava/lang/ClassLoader;Ljava/lang/ClassLoader;)V");
815
816 JavaCallArguments args;
817 args.push_oop(Handle(THREAD, SystemDictionary::java_platform_loader()));
818 args.push_oop(Handle(THREAD, SystemDictionary::java_system_loader()));
819 JavaValue result(T_VOID);
820 JavaCalls::call_static(&result,
821 klass,
822 method,
823 signature,
824 &args, CHECK);
825 }
826
827
828 void AOTConstantPoolResolver::define_dynamic_proxy_class(Handle loader, Handle proxy_name, Handle interfaces, int access_flags, TRAPS) {
829 if (!CDSConfig::is_dumping_dynamic_proxies()) {
830 return;
831 }
832 init_dynamic_proxy_cache(CHECK);
833
834 Klass* klass = resolve_boot_class_or_fail("java/lang/reflect/Proxy$ProxyBuilder", CHECK);
835 TempNewSymbol method = SymbolTable::new_symbol("defineProxyClassForCDS");
836 TempNewSymbol signature = SymbolTable::new_symbol("(Ljava/lang/ClassLoader;Ljava/lang/String;[Ljava/lang/Class;I)Ljava/lang/Class;");
837
838 JavaCallArguments args;
839 args.push_oop(Handle(THREAD, loader()));
840 args.push_oop(Handle(THREAD, proxy_name()));
841 args.push_oop(Handle(THREAD, interfaces()));
842 args.push_int(access_flags);
843 JavaValue result(T_OBJECT);
844 JavaCalls::call_static(&result,
845 klass,
846 method,
847 signature,
848 &args, CHECK);
849
850 // Assumptions:
851 // FMG is archived, which means -modulepath and -Xbootclasspath are both not specified.
852 // All named modules are loaded from the system modules files.
853 // TODO: test support for -Xbootclasspath after JDK-8322322. Some of the code below need to be changed.
854 // TODO: we just give dummy shared_classpath_index for the generated class so that it will be archived.
855 // The index is not used at runtime (see SystemDictionaryShared::load_shared_class_for_builtin_loader, which
856 // uses a null ProtectionDomain for this class)
857 oop mirror = result.get_oop();
858 assert(mirror != nullptr, "class must have been generated if not OOM");
859 InstanceKlass* ik = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
860 if (ik->defined_by_boot_loader() || ik->defined_by_platform_loader()) {
861 assert(ik->module()->is_named(), "dynamic proxies defined in unnamed modules for boot/platform loaders not supported");
862 ik->set_shared_classpath_index(0);
863 } else {
864 assert(ik->defined_by_app_loader(), "must be");
865 ik->set_shared_classpath_index(AOTClassLocationConfig::dumptime()->app_cp_start_index());
866 }
867
868 ArchiveBuilder::alloc_stats()->record_dynamic_proxy_class();
869 if (log_is_enabled(Info, cds, dynamic, proxy)) {
870 ResourceMark rm(THREAD);
871 stringStream ss;
872 const char* prefix = "";
873 ss.print("%s (%-7s, cp index = %d) implements ", ik->external_name(),
874 ArchiveUtils::builtin_loader_name(loader()), ik->shared_classpath_index());
875 objArrayOop intfs = (objArrayOop)interfaces();
876 for (int i = 0; i < intfs->length(); i++) {
877 oop intf_mirror = intfs->obj_at(i);
878 ss.print("%s%s", prefix, java_lang_Class::as_Klass(intf_mirror)->external_name());
879 prefix = ", ";
880 }
881
882 log_info(cds, dynamic, proxy)("%s", ss.freeze());
883 }
884 }