1 /*
2 * Copyright (c) 2022, 2025, 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 Klass* elem = ObjArrayKlass::cast(resolved_class)->bottom_klass();
133 if (elem->is_instance_klass()) {
134 return is_class_resolution_deterministic(cp_holder, InstanceKlass::cast(elem));
135 } else if (elem->is_typeArray_klass()) {
136 return true;
137 } else {
138 return false;
139 }
140 } else if (resolved_class->is_typeArray_klass()) {
141 return true;
142 } else {
143 return false;
144 }
145 }
146
147 void AOTConstantPoolResolver::preresolve_string_cp_entries(InstanceKlass* ik, TRAPS) {
148 if (!ik->is_linked()) {
149 // The cp->resolved_referenced() array is not ready yet, so we can't call resolve_string().
150 return;
151 }
152 constantPoolHandle cp(THREAD, ik->constants());
153 for (int cp_index = 1; cp_index < cp->length(); cp_index++) { // Index 0 is unused
154 switch (cp->tag_at(cp_index).value()) {
155 case JVM_CONSTANT_String:
156 resolve_string(cp, cp_index, CHECK); // may throw OOM when interning strings.
157 break;
158 }
159 }
160
161 // Normally, we don't want to archive any CP entries that were not resolved
162 // in the training run. Otherwise the AOT/JIT may inline too much code that has not
163 // been executed.
164 //
165 // However, we want to aggressively resolve all klass/field/method constants for
166 // LambdaForm Invoker Holder classes, Lambda Proxy classes, and LambdaForm classes,
167 // so that the compiler can inline through them.
168 if (SystemDictionaryShared::is_builtin_loader(ik->class_loader_data())) {
169 bool eager_resolve = false;
170
171 if (LambdaFormInvokers::may_be_regenerated_class(ik->name())) {
172 eager_resolve = true;
173 }
174 if (ik->is_hidden() && HeapShared::is_archivable_hidden_klass(ik)) {
175 eager_resolve = true;
176 }
177
178 if (eager_resolve) {
179 preresolve_class_cp_entries(THREAD, ik, nullptr);
180 preresolve_field_and_method_cp_entries(THREAD, ik, nullptr);
181 }
182 }
183 }
184
185 // This works only for the boot/platform/app loaders
186 Klass* AOTConstantPoolResolver::find_loaded_class(Thread* current, oop class_loader, Symbol* name) {
187 HandleMark hm(current);
188 Handle h_loader(current, class_loader);
189 Klass* k = SystemDictionary::find_instance_or_array_klass(current, name, h_loader);
190 if (k != nullptr) {
191 return k;
192 }
193 if (h_loader() == SystemDictionary::java_system_loader()) {
194 return find_loaded_class(current, SystemDictionary::java_platform_loader(), name);
195 } else if (h_loader() == SystemDictionary::java_platform_loader()) {
196 return find_loaded_class(current, nullptr, name);
197 } else {
198 assert(h_loader() == nullptr, "This function only works for boot/platform/app loaders %p %p %p",
199 cast_from_oop<address>(h_loader()),
200 cast_from_oop<address>(SystemDictionary::java_system_loader()),
201 cast_from_oop<address>(SystemDictionary::java_platform_loader()));
202 }
203
204 return nullptr;
205 }
206
207 Klass* AOTConstantPoolResolver::find_loaded_class(Thread* current, ConstantPool* cp, int class_cp_index) {
208 Symbol* name = cp->klass_name_at(class_cp_index);
209 return find_loaded_class(current, cp->pool_holder()->class_loader(), name);
210 }
211
212 #if INCLUDE_CDS_JAVA_HEAP
213 void AOTConstantPoolResolver::resolve_string(constantPoolHandle cp, int cp_index, TRAPS) {
214 if (CDSConfig::is_dumping_heap()) {
215 int cache_index = cp->cp_to_object_index(cp_index);
216 ConstantPool::string_at_impl(cp, cp_index, cache_index, CHECK);
217 }
218 }
219 #endif
220
221 void AOTConstantPoolResolver::preresolve_class_cp_entries(JavaThread* current, InstanceKlass* ik, GrowableArray<bool>* preresolve_list) {
222 if (!SystemDictionaryShared::is_builtin_loader(ik->class_loader_data())) {
223 return;
224 }
225
226 JavaThread* THREAD = current;
227 constantPoolHandle cp(THREAD, ik->constants());
228 for (int cp_index = 1; cp_index < cp->length(); cp_index++) {
229 if (cp->tag_at(cp_index).value() == JVM_CONSTANT_UnresolvedClass) {
230 if (preresolve_list != nullptr && preresolve_list->at(cp_index) == false) {
231 // This class was not resolved during trial run. Don't attempt to resolve it. Otherwise
232 // the compiler may generate less efficient code.
233 continue;
234 }
235 if (find_loaded_class(current, cp(), cp_index) == nullptr) {
236 // Do not resolve any class that has not been loaded yet
237 continue;
238 }
239 Klass* resolved_klass = cp->klass_at(cp_index, THREAD);
240 if (HAS_PENDING_EXCEPTION) {
241 CLEAR_PENDING_EXCEPTION; // just ignore
242 } else {
243 log_trace(aot, resolve)("Resolved class [%3d] %s -> %s", cp_index, ik->external_name(),
244 resolved_klass->external_name());
245 }
246 }
247 }
248 }
249
250 void AOTConstantPoolResolver::preresolve_field_and_method_cp_entries(JavaThread* current, InstanceKlass* ik, GrowableArray<bool>* preresolve_list) {
251 JavaThread* THREAD = current;
252 constantPoolHandle cp(THREAD, ik->constants());
253 if (cp->cache() == nullptr) {
254 return;
255 }
256 for (int i = 0; i < ik->methods()->length(); i++) {
257 Method* m = ik->methods()->at(i);
258 BytecodeStream bcs(methodHandle(THREAD, m));
259 while (!bcs.is_last_bytecode()) {
260 bcs.next();
261 Bytecodes::Code raw_bc = bcs.raw_code();
262 switch (raw_bc) {
263 case Bytecodes::_getstatic:
264 case Bytecodes::_putstatic:
265 case Bytecodes::_getfield:
266 case Bytecodes::_putfield:
267 maybe_resolve_fmi_ref(ik, m, raw_bc, bcs.get_index_u2(), preresolve_list, THREAD);
268 if (HAS_PENDING_EXCEPTION) {
269 CLEAR_PENDING_EXCEPTION; // just ignore
270 }
271 break;
272 case Bytecodes::_invokehandle:
273 case Bytecodes::_invokespecial:
274 case Bytecodes::_invokevirtual:
275 case Bytecodes::_invokeinterface:
276 case Bytecodes::_invokestatic:
277 maybe_resolve_fmi_ref(ik, m, raw_bc, bcs.get_index_u2(), preresolve_list, THREAD);
278 if (HAS_PENDING_EXCEPTION) {
279 CLEAR_PENDING_EXCEPTION; // just ignore
280 }
281 break;
282 default:
283 break;
284 }
285 }
286 }
287 }
288
289 void AOTConstantPoolResolver::maybe_resolve_fmi_ref(InstanceKlass* ik, Method* m, Bytecodes::Code bc, int raw_index,
290 GrowableArray<bool>* preresolve_list, TRAPS) {
291 methodHandle mh(THREAD, m);
292 constantPoolHandle cp(THREAD, ik->constants());
293 HandleMark hm(THREAD);
294 int cp_index = cp->to_cp_index(raw_index, bc);
295
296 if (cp->is_resolved(raw_index, bc)) {
297 return;
298 }
299
300 if (preresolve_list != nullptr && preresolve_list->at(cp_index) == false) {
301 // This field wasn't resolved during the trial run. Don't attempt to resolve it. Otherwise
302 // the compiler may generate less efficient code.
303 return;
304 }
305
306 int klass_cp_index = cp->uncached_klass_ref_index_at(cp_index);
307 if (find_loaded_class(THREAD, cp(), klass_cp_index) == nullptr) {
308 // Do not resolve any field/methods from a class that has not been loaded yet.
309 return;
310 }
311
312 Klass* resolved_klass = cp->klass_ref_at(raw_index, bc, CHECK);
313 const char* is_static = "";
314
315 switch (bc) {
316 case Bytecodes::_getstatic:
317 case Bytecodes::_putstatic:
318 if (!VM_Version::supports_fast_class_init_checks()) {
319 return; // Do not resolve since interpreter lacks fast clinit barriers support
320 }
321 InterpreterRuntime::resolve_get_put(bc, raw_index, mh, cp, false /*initialize_holder*/, CHECK);
322 is_static = " *** static";
323 break;
324 case Bytecodes::_getfield:
325 case Bytecodes::_putfield:
326 InterpreterRuntime::resolve_get_put(bc, raw_index, mh, cp, false /*initialize_holder*/, CHECK);
327 break;
328
329 case Bytecodes::_invokestatic:
330 if (!VM_Version::supports_fast_class_init_checks()) {
331 return; // Do not resolve since interpreter lacks fast clinit barriers support
332 }
333 InterpreterRuntime::cds_resolve_invoke(bc, raw_index, cp, CHECK);
334 is_static = " *** static";
335 break;
336
337 case Bytecodes::_invokevirtual:
338 case Bytecodes::_invokespecial:
339 case Bytecodes::_invokeinterface:
340 InterpreterRuntime::cds_resolve_invoke(bc, raw_index, cp, CHECK);
341 break;
342
343 case Bytecodes::_invokehandle:
344 InterpreterRuntime::cds_resolve_invokehandle(raw_index, cp, CHECK);
345 break;
346
347 default:
348 ShouldNotReachHere();
349 }
350
351 if (log_is_enabled(Trace, aot, resolve)) {
352 ResourceMark rm(THREAD);
353 bool resolved = cp->is_resolved(raw_index, bc);
354 Symbol* name = cp->name_ref_at(raw_index, bc);
355 Symbol* signature = cp->signature_ref_at(raw_index, bc);
356 log_trace(aot, resolve)("%s %s [%3d] %s -> %s.%s:%s%s",
357 (resolved ? "Resolved" : "Failed to resolve"),
358 Bytecodes::name(bc), cp_index, ik->external_name(),
359 resolved_klass->external_name(),
360 name->as_C_string(), signature->as_C_string(), is_static);
361 }
362 }
363
364 void AOTConstantPoolResolver::preresolve_indy_cp_entries(JavaThread* current, InstanceKlass* ik, GrowableArray<bool>* preresolve_list) {
365 JavaThread* THREAD = current;
366 constantPoolHandle cp(THREAD, ik->constants());
367 if (!CDSConfig::is_dumping_invokedynamic() || cp->cache() == nullptr) {
368 return;
369 }
370
371 assert(preresolve_list != nullptr, "preresolve_indy_cp_entries() should not be called for "
372 "regenerated LambdaForm Invoker classes, which should not have indys anyway.");
373
374 Array<ResolvedIndyEntry>* indy_entries = cp->cache()->resolved_indy_entries();
375 for (int i = 0; i < indy_entries->length(); i++) {
376 ResolvedIndyEntry* rie = indy_entries->adr_at(i);
377 int cp_index = rie->constant_pool_index();
378 if (preresolve_list->at(cp_index) == true) {
379 if (!rie->is_resolved() && is_indy_resolution_deterministic(cp(), cp_index)) {
380 InterpreterRuntime::cds_resolve_invokedynamic(i, cp, THREAD);
381 if (HAS_PENDING_EXCEPTION) {
382 CLEAR_PENDING_EXCEPTION; // just ignore
383 }
384 }
385 if (log_is_enabled(Trace, aot, resolve)) {
386 ResourceMark rm(THREAD);
387 log_trace(aot, resolve)("%s indy [%3d] %s",
388 rie->is_resolved() ? "Resolved" : "Failed to resolve",
389 cp_index, ik->external_name());
390 }
391 }
392 }
393 }
394
395 // Check the MethodType signatures used by parameters to the indy BSMs. Make sure we don't
396 // use types that have been excluded, or else we might end up creating MethodTypes that cannot be stored
397 // in the AOT cache.
398 bool AOTConstantPoolResolver::check_methodtype_signature(ConstantPool* cp, Symbol* sig, Klass** return_type_ret) {
399 ResourceMark rm;
400 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
401 if (ss.is_reference()) {
402 Symbol* type = ss.as_symbol();
403 Klass* k = find_loaded_class(Thread::current(), cp->pool_holder()->class_loader(), type);
404 if (k == nullptr) {
405 return false;
406 }
407
408 if (SystemDictionaryShared::should_be_excluded(k)) {
409 if (log_is_enabled(Warning, aot, resolve)) {
410 ResourceMark rm;
411 log_warning(aot, resolve)("Cannot aot-resolve Lambda proxy because %s is excluded", k->external_name());
412 }
413 return false;
414 }
415
416 if (ss.at_return_type() && return_type_ret != nullptr) {
417 *return_type_ret = k;
418 }
419 }
420 }
421 return true;
422 }
423
424 bool AOTConstantPoolResolver::check_lambda_metafactory_signature(ConstantPool* cp, Symbol* sig) {
425 Klass* k;
426 if (!check_methodtype_signature(cp, sig, &k)) {
427 return false;
428 }
429
430 // <k> is the interface type implemented by the lambda proxy
431 if (!k->is_interface()) {
432 // cp->pool_holder() doesn't look like a valid class generated by javac
433 return false;
434 }
435
436
437 // The linked lambda callsite has an instance of the interface implemented by this lambda. If this
438 // interface requires its <clinit> to be executed, then we must delay the execution to the production run
439 // as <clinit> can have side effects ==> exclude such cases.
440 InstanceKlass* intf = InstanceKlass::cast(k);
441 bool exclude = intf->interface_needs_clinit_execution_as_super();
442 if (log_is_enabled(Debug, aot, resolve)) {
443 ResourceMark rm;
444 log_debug(aot, resolve)("%s aot-resolve Lambda proxy of interface type %s",
445 exclude ? "Cannot" : "Can", k->external_name());
446 }
447 return !exclude;
448 }
449
450 bool AOTConstantPoolResolver::check_lambda_metafactory_methodtype_arg(ConstantPool* cp, int bsms_attribute_index, int arg_i) {
451 int mt_index = cp->bsm_attribute_entry(bsms_attribute_index)->argument_index(arg_i);
452 if (!cp->tag_at(mt_index).is_method_type()) {
453 // malformed class?
454 return false;
455 }
456
457 Symbol* sig = cp->method_type_signature_at(mt_index);
458 if (log_is_enabled(Debug, aot, resolve)) {
459 ResourceMark rm;
460 log_debug(aot, resolve)("Checking MethodType for LambdaMetafactory BSM arg %d: %s", arg_i, sig->as_C_string());
461 }
462
463 return check_methodtype_signature(cp, sig);
464 }
465
466 bool AOTConstantPoolResolver::check_lambda_metafactory_methodhandle_arg(ConstantPool* cp, int bsms_attribute_index, int arg_i) {
467 int mh_index = cp->bsm_attribute_entry(bsms_attribute_index)->argument_index(arg_i);
468 if (!cp->tag_at(mh_index).is_method_handle()) {
469 // malformed class?
470 return false;
471 }
472
473 Symbol* sig = cp->method_handle_signature_ref_at(mh_index);
474 if (log_is_enabled(Debug, aot, resolve)) {
475 ResourceMark rm;
476 log_debug(aot, resolve)("Checking MethodType of MethodHandle for LambdaMetafactory BSM arg %d: %s", arg_i, sig->as_C_string());
477 }
478 return check_methodtype_signature(cp, sig);
479 }
480
481 bool AOTConstantPoolResolver::is_indy_resolution_deterministic(ConstantPool* cp, int cp_index) {
482 assert(cp->tag_at(cp_index).is_invoke_dynamic(), "sanity");
483 if (!CDSConfig::is_dumping_invokedynamic()) {
484 return false;
485 }
486
487 InstanceKlass* pool_holder = cp->pool_holder();
488 if (!SystemDictionaryShared::is_builtin(pool_holder)) {
489 return false;
490 }
491
492 int bsm = cp->bootstrap_method_ref_index_at(cp_index);
493 int bsm_ref = cp->method_handle_index_at(bsm);
494 Symbol* bsm_name = cp->uncached_name_ref_at(bsm_ref);
495 Symbol* bsm_signature = cp->uncached_signature_ref_at(bsm_ref);
496 Symbol* bsm_klass = cp->klass_name_at(cp->uncached_klass_ref_index_at(bsm_ref));
497
498 // We currently support only StringConcatFactory::makeConcatWithConstants() and LambdaMetafactory::metafactory()
499 // We should mark the allowed BSMs in the JDK code using a private annotation.
500 // See notes on RFE JDK-8342481.
501
502 if (bsm_klass->equals("java/lang/invoke/StringConcatFactory") &&
503 bsm_name->equals("makeConcatWithConstants") &&
504 bsm_signature->equals("(Ljava/lang/invoke/MethodHandles$Lookup;"
505 "Ljava/lang/String;"
506 "Ljava/lang/invoke/MethodType;"
507 "Ljava/lang/String;"
508 "[Ljava/lang/Object;"
509 ")Ljava/lang/invoke/CallSite;")) {
510 Symbol* factory_type_sig = cp->uncached_signature_ref_at(cp_index);
511 if (log_is_enabled(Debug, aot, resolve)) {
512 ResourceMark rm;
513 log_debug(aot, resolve)("Checking StringConcatFactory callsite signature [%d]: %s", cp_index, factory_type_sig->as_C_string());
514 }
515
516 Klass* k;
517 if (!check_methodtype_signature(cp, factory_type_sig, &k)) {
518 return false;
519 }
520 if (k != vmClasses::String_klass()) {
521 // bad class file?
522 return false;
523 }
524
525 return true;
526 }
527
528 if (bsm_klass->equals("java/lang/invoke/LambdaMetafactory") &&
529 bsm_name->equals("metafactory") &&
530 bsm_signature->equals("(Ljava/lang/invoke/MethodHandles$Lookup;"
531 "Ljava/lang/String;"
532 "Ljava/lang/invoke/MethodType;"
533 "Ljava/lang/invoke/MethodType;"
534 "Ljava/lang/invoke/MethodHandle;"
535 "Ljava/lang/invoke/MethodType;"
536 ")Ljava/lang/invoke/CallSite;")) {
537 /*
538 * An indy callsite is associated with the following MethodType and MethodHandles:
539 *
540 * https://github.com/openjdk/jdk/blob/580eb62dc097efeb51c76b095c1404106859b673/src/java.base/share/classes/java/lang/invoke/LambdaMetafactory.java#L293-L309
541 *
542 * MethodType factoryType The expected signature of the {@code CallSite}. The
543 * parameter types represent the types of capture variables;
544 * the return type is the interface to implement. When
545 * used with {@code invokedynamic}, this is provided by
546 * the {@code NameAndType} of the {@code InvokeDynamic}
547 *
548 * MethodType interfaceMethodType Signature and return type of method to be
549 * implemented by the function object.
550 *
551 * MethodHandle implementation A direct method handle describing the implementation
552 * method which should be called (with suitable adaptation
553 * of argument types and return types, and with captured
554 * arguments prepended to the invocation arguments) at
555 * invocation time.
556 *
557 * MethodType dynamicMethodType The signature and return type that should
558 * be enforced dynamically at invocation time.
559 * In simple use cases this is the same as
560 * {@code interfaceMethodType}.
561 */
562 Symbol* factory_type_sig = cp->uncached_signature_ref_at(cp_index);
563 if (log_is_enabled(Debug, aot, resolve)) {
564 ResourceMark rm;
565 log_debug(aot, resolve)("Checking lambda callsite signature [%d]: %s", cp_index, factory_type_sig->as_C_string());
566 }
567
568 if (!check_lambda_metafactory_signature(cp, factory_type_sig)) {
569 return false;
570 }
571
572 int bsms_attribute_index = cp->bootstrap_methods_attribute_index(cp_index);
573 int arg_count = cp->bsm_attribute_entry(bsms_attribute_index)->argument_count();
574 if (arg_count != 3) {
575 // Malformed class?
576 return false;
577 }
578
579 // interfaceMethodType
580 if (!check_lambda_metafactory_methodtype_arg(cp, bsms_attribute_index, 0)) {
581 return false;
582 }
583
584 // implementation
585 if (!check_lambda_metafactory_methodhandle_arg(cp, bsms_attribute_index, 1)) {
586 return false;
587 }
588
589 // dynamicMethodType
590 if (!check_lambda_metafactory_methodtype_arg(cp, bsms_attribute_index, 2)) {
591 return false;
592 }
593
594 return true;
595 }
596
597 return false;
598 }
599 #ifdef ASSERT
600 bool AOTConstantPoolResolver::is_in_archivebuilder_buffer(address p) {
601 if (!Thread::current()->is_VM_thread() || ArchiveBuilder::current() == nullptr) {
602 return false;
603 } else {
604 return ArchiveBuilder::current()->is_in_buffer_space(p);
605 }
606 }
607 #endif
608
609 // Paranoid check -- if any field/method signature in <ik> is referencing a class that is known to be
610 // excluded, do not archive any reflection data in <ik>.
611 bool AOTConstantPoolResolver::check_signature_for_reflection_data(InstanceKlass* ik, Symbol* sig, bool is_method) {
612 precond(SafepointSynchronize::is_at_safepoint());
613 ResourceMark rm;
614 for (SignatureStream ss(sig, is_method); !ss.is_done(); ss.next()) {
615 if (ss.is_reference()) {
616 Symbol* klass_name = ss.as_symbol(/*probe_only=*/true);
617 if (klass_name == nullptr) {
618 // This symbol has never been created during the assembly phase, so it can't
619 // possibly be referencing an excluded class.
620 continue;
621 }
622 if (Signature::is_array(klass_name)) {
623 SignatureStream ss2(klass_name, false);
624 ss2.skip_array_prefix();
625 if (ss2.is_reference() && ss2.as_symbol(/*probe_only=*/true) == nullptr) {
626 // klass_name is an array klass that has not been loaded during the assembly phase, so it can't
627 // possibly be referencing an excluded class.
628 continue;
629 }
630 }
631 Klass* k = find_loaded_class(Thread::current(), ik->class_loader(), klass_name);
632 if (k == nullptr) {
633 // No class of this name has been loaded for this loader, so this name can't
634 // possibly be referencing an excluded class.
635 continue;
636 }
637 if (SystemDictionaryShared::should_be_excluded(k)) {
638 if (log_is_enabled(Warning, aot, resolve)) {
639 ResourceMark rm;
640 log_warning(aot, resolve)("Cannot archive reflection data in %s because it refers to excluded class %s",
641 ik->external_name(), k->external_name());
642 }
643 return false;
644 }
645 }
646 }
647 return true;
648 }
649
650 bool AOTConstantPoolResolver::can_archive_reflection_data_declared_fields(InstanceKlass* ik) {
651 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
652 if (!check_signature_for_reflection_data(ik, fs.signature(), /*is_method=*/false)) {
653 return false;
654 }
655 }
656
657 return true;
658 }
659
660 bool AOTConstantPoolResolver::can_archive_reflection_data_declared_methods(InstanceKlass* ik) {
661 Array<Method*>* methods = ik->methods();
662 for (int i = 0; i < methods->length(); i++) {
663 Method* m = methods->at(i);
664 if (!check_signature_for_reflection_data(ik, m->signature(), /*is_method=*/true)) {
665 return false;
666 }
667 }
668
669 return true;
670 }
671
672 // This is called by AOT assembly phase to see if java_lang_Class::reflection_data(k) can be
673 // archived.
674 bool AOTConstantPoolResolver::can_archive_reflection_data(InstanceKlass* ik) {
675 // At this point, we have resolved the reflection data of *all* classes
676 // recorded by FinalImageRecipes.
677 // When we are in the AOT safepoint, we will archive the reflection
678 // data of <ik> *only if* it doesn't reference any excluded classes.
679 precond(SafepointSynchronize::is_at_safepoint());
680
681 if (!can_archive_reflection_data_declared_fields(ik)) {
682 return false;
683 }
684 if (!can_archive_reflection_data_declared_methods(ik)) {
685 return false;
686 }
687
688 if (log_is_enabled(Info, aot, resolve)) {
689 ResourceMark rm;
690 log_info(aot, resolve)("Archived reflection data in %s", ik->external_name());
691 }
692
693 return true;
694 }
695
696 int AOTConstantPoolResolver::class_reflection_data_flags(InstanceKlass* ik, TRAPS) {
697 assert(java_lang_Class::has_reflection_data(ik->java_mirror()), "must be");
698
699 HandleMark hm(THREAD);
700 JavaCallArguments args(Handle(THREAD, ik->java_mirror()));
701 JavaValue result(T_INT);
702 JavaCalls::call_special(&result,
703 vmClasses::Class_klass(),
704 vmSymbols::encodeReflectionData_name(),
705 vmSymbols::void_int_signature(),
706 &args, CHECK_0);
707 int flags = result.get_jint();
708 aot_log_info(aot)("Encode ReflectionData: %s (flags=0x%x)", ik->external_name(), flags);
709 return flags;
710 }
711
712 void AOTConstantPoolResolver::generate_reflection_data(JavaThread* current, InstanceKlass* ik, int rd_flags) {
713 aot_log_info(aot)("Generate ReflectionData: %s (flags=" INT32_FORMAT_X ")", ik->external_name(), rd_flags);
714 JavaThread* THREAD = current; // for exception macros
715 JavaCallArguments args(Handle(THREAD, ik->java_mirror()));
716 args.push_int(rd_flags);
717 JavaValue result(T_OBJECT);
718 JavaCalls::call_special(&result,
719 vmClasses::Class_klass(),
720 vmSymbols::generateReflectionData_name(),
721 vmSymbols::int_void_signature(),
722 &args, THREAD);
723 if (HAS_PENDING_EXCEPTION) {
724 Handle exc_handle(THREAD, PENDING_EXCEPTION);
725 CLEAR_PENDING_EXCEPTION;
726
727 log_warning(aot)("Exception during Class::generateReflectionData() call for %s", ik->external_name());
728 LogStreamHandle(Debug, aot) log;
729 if (log.is_enabled()) {
730 java_lang_Throwable::print_stack_trace(exc_handle, &log);
731 }
732 }
733 }
734
735 Klass* AOTConstantPoolResolver::resolve_boot_class_or_fail(const char* class_name, TRAPS) {
736 Handle class_loader;
737 TempNewSymbol class_name_sym = SymbolTable::new_symbol(class_name);
738 return SystemDictionary::resolve_or_fail(class_name_sym, class_loader, true, THREAD);
739 }
740
741 void AOTConstantPoolResolver::trace_dynamic_proxy_class(oop loader, const char* proxy_name, objArrayOop interfaces, int access_flags) {
742 if (interfaces->length() < 1) {
743 return;
744 }
745 if (ClassListWriter::is_enabled()) {
746 const char* loader_name = ArchiveUtils::builtin_loader_name_or_null(loader);
747 if (loader_name != nullptr) {
748 stringStream ss;
749 ss.print("%s %s %d %d", loader_name, proxy_name, access_flags, interfaces->length());
750 for (int i = 0; i < interfaces->length(); i++) {
751 oop mirror = interfaces->obj_at(i);
752 Klass* k = java_lang_Class::as_Klass(mirror);
753 ss.print(" %s", k->name()->as_C_string());
754 }
755 ClassListWriter w; // This locks ClassListFile_lock
756 w.stream()->print_cr("@dynamic-proxy %s", ss.freeze());
757 }
758 }
759 if (CDSConfig::is_dumping_preimage_static_archive()) {
760 FinalImageRecipes::add_dynamic_proxy_class(loader, proxy_name, interfaces, access_flags);
761 }
762 }
763
764 void AOTConstantPoolResolver::init_dynamic_proxy_cache(TRAPS) {
765 static bool inited = false;
766 if (inited) {
767 return;
768 }
769 inited = true;
770
771 Klass* klass = resolve_boot_class_or_fail("java/lang/reflect/Proxy", CHECK);
772 TempNewSymbol method = SymbolTable::new_symbol("initCacheForCDS");
773 TempNewSymbol signature = SymbolTable::new_symbol("(Ljava/lang/ClassLoader;Ljava/lang/ClassLoader;)V");
774
775 JavaCallArguments args;
776 args.push_oop(Handle(THREAD, SystemDictionary::java_platform_loader()));
777 args.push_oop(Handle(THREAD, SystemDictionary::java_system_loader()));
778 JavaValue result(T_VOID);
779 JavaCalls::call_static(&result,
780 klass,
781 method,
782 signature,
783 &args, CHECK);
784 }
785
786
787 void AOTConstantPoolResolver::define_dynamic_proxy_class(Handle loader, Handle proxy_name, Handle interfaces, int access_flags, TRAPS) {
788 if (!CDSConfig::is_dumping_dynamic_proxies()) {
789 return;
790 }
791 init_dynamic_proxy_cache(CHECK);
792
793 Klass* klass = resolve_boot_class_or_fail("java/lang/reflect/Proxy$ProxyBuilder", CHECK);
794 TempNewSymbol method = SymbolTable::new_symbol("defineProxyClassForCDS");
795 TempNewSymbol signature = SymbolTable::new_symbol("(Ljava/lang/ClassLoader;Ljava/lang/String;[Ljava/lang/Class;I)Ljava/lang/Class;");
796
797 JavaCallArguments args;
798 args.push_oop(Handle(THREAD, loader()));
799 args.push_oop(Handle(THREAD, proxy_name()));
800 args.push_oop(Handle(THREAD, interfaces()));
801 args.push_int(access_flags);
802 JavaValue result(T_OBJECT);
803 JavaCalls::call_static(&result,
804 klass,
805 method,
806 signature,
807 &args, CHECK);
808
809 // Assumptions:
810 // FMG is archived, which means -modulepath and -Xbootclasspath are both not specified.
811 // All named modules are loaded from the system modules files.
812 // TODO: test support for -Xbootclasspath after JDK-8322322. Some of the code below need to be changed.
813 // TODO: we just give dummy shared_classpath_index for the generated class so that it will be archived.
814 // The index is not used at runtime (see SystemDictionaryShared::load_shared_class_for_builtin_loader, which
815 // uses a null ProtectionDomain for this class)
816 oop mirror = result.get_oop();
817 assert(mirror != nullptr, "class must have been generated if not OOM");
818 InstanceKlass* ik = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
819 if (ik->defined_by_boot_loader() || ik->defined_by_platform_loader()) {
820 assert(ik->module()->is_named(), "dynamic proxies defined in unnamed modules for boot/platform loaders not supported");
821 ik->set_shared_classpath_index(0);
822 } else {
823 assert(ik->defined_by_app_loader(), "must be");
824 ik->set_shared_classpath_index(AOTClassLocationConfig::dumptime()->app_cp_start_index());
825 }
826
827 ArchiveBuilder::alloc_stats()->record_dynamic_proxy_class();
828 if (log_is_enabled(Info, cds, dynamic, proxy)) {
829 ResourceMark rm(THREAD);
830 stringStream ss;
831 const char* prefix = "";
832 ss.print("%s (%-7s, cp index = %d) implements ", ik->external_name(),
833 ArchiveUtils::builtin_loader_name(loader()), ik->shared_classpath_index());
834 objArrayOop intfs = (objArrayOop)interfaces();
835 for (int i = 0; i < intfs->length(); i++) {
836 oop intf_mirror = intfs->obj_at(i);
837 ss.print("%s%s", prefix, java_lang_Class::as_Klass(intf_mirror)->external_name());
838 prefix = ", ";
839 }
840
841 log_info(cds, dynamic, proxy)("%s", ss.freeze());
842 }
843 }