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/archiveBuilder.hpp"
29 #include "cds/archiveUtils.inline.hpp"
30 #include "cds/cdsConfig.hpp"
31 #include "cds/classListWriter.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/classLoaderExt.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/instanceKlass.hpp"
47 #include "oops/klass.inline.hpp"
48 #include "runtime/handles.inline.hpp"
49 #include "runtime/javaCalls.hpp"
50
51 AOTConstantPoolResolver::ClassesTable* AOTConstantPoolResolver::_processed_classes = nullptr;
52
53 void AOTConstantPoolResolver::initialize() {
54 assert(_processed_classes == nullptr, "must be");
55 _processed_classes = new (mtClass)ClassesTable();
56 }
57
58 void AOTConstantPoolResolver::dispose() {
59 assert(_processed_classes != nullptr, "must be");
60 delete _processed_classes;
61 _processed_classes = nullptr;
62 }
63
64 // Returns true if we CAN PROVE that cp_index will always resolve to
65 // the same information at both dump time and run time. This is a
66 // necessary (but not sufficient) condition for pre-resolving cp_index
67 // during CDS archive assembly.
68 bool AOTConstantPoolResolver::is_resolution_deterministic(ConstantPool* cp, int cp_index) {
69 assert(!is_in_archivebuilder_buffer(cp), "sanity");
70
71 if (cp->tag_at(cp_index).is_klass()) {
72 // We require cp_index to be already resolved. This is fine for now, are we
73 // currently archive only CP entries that are already resolved.
74 Klass* resolved_klass = cp->resolved_klass_at(cp_index);
75 return resolved_klass != nullptr && is_class_resolution_deterministic(cp->pool_holder(), resolved_klass);
76 } else if (cp->tag_at(cp_index).is_invoke_dynamic()) {
77 return is_indy_resolution_deterministic(cp, cp_index);
78 } else if (cp->tag_at(cp_index).is_field() ||
79 cp->tag_at(cp_index).is_method() ||
80 cp->tag_at(cp_index).is_interface_method()) {
81 int klass_cp_index = cp->uncached_klass_ref_index_at(cp_index);
82 if (!cp->tag_at(klass_cp_index).is_klass()) {
83 // Not yet resolved
84 return false;
85 }
86 Klass* k = cp->resolved_klass_at(klass_cp_index);
87 if (!is_class_resolution_deterministic(cp->pool_holder(), k)) {
88 return false;
89 }
90
91 if (!k->is_instance_klass()) {
92 // TODO: support non instance klasses as well.
93 return false;
94 }
95
96 // Here, We don't check if this entry can actually be resolved to a valid Field/Method.
97 // This method should be called by the ConstantPool to check Fields/Methods that
98 // have already been successfully resolved.
99 return true;
100 } else {
101 return false;
102 }
103 }
104
105 bool AOTConstantPoolResolver::is_class_resolution_deterministic(InstanceKlass* cp_holder, Klass* resolved_class) {
106 assert(!is_in_archivebuilder_buffer(cp_holder), "sanity");
107 assert(!is_in_archivebuilder_buffer(resolved_class), "sanity");
108
109 if (resolved_class->is_instance_klass()) {
110 InstanceKlass* ik = InstanceKlass::cast(resolved_class);
111
112 if (!ik->is_shared() && SystemDictionaryShared::is_excluded_class(ik)) {
113 return false;
114 }
115
116 if (cp_holder->is_subtype_of(ik)) {
117 // All super types of ik will be resolved in ik->class_loader() before
118 // ik is defined in this loader, so it's safe to archive the resolved klass reference.
119 return true;
120 }
121
122 if (CDSConfig::is_dumping_aot_linked_classes()) {
123 // Need to call try_add_candidate instead of is_candidate, as this may be called
124 // before AOTClassLinker::add_candidates().
125 if (AOTClassLinker::try_add_candidate(ik)) {
126 return true;
127 } else {
128 return false;
129 }
130 } else if (AOTClassLinker::is_vm_class(ik)) {
131 if (ik->class_loader() != cp_holder->class_loader()) {
132 // At runtime, cp_holder() may not be able to resolve to the same
133 // ik. For example, a different version of ik may be defined in
134 // cp->pool_holder()'s loader using MethodHandles.Lookup.defineClass().
135 return false;
136 } else {
137 return true;
138 }
139 } else {
140 return false;
141 }
142 } else if (resolved_class->is_objArray_klass()) {
143 Klass* elem = ObjArrayKlass::cast(resolved_class)->bottom_klass();
144 if (elem->is_instance_klass()) {
145 return is_class_resolution_deterministic(cp_holder, InstanceKlass::cast(elem));
146 } else if (elem->is_typeArray_klass()) {
147 return true;
148 } else {
149 return false;
150 }
151 } else if (resolved_class->is_typeArray_klass()) {
152 return true;
153 } else {
154 return false;
155 }
156 }
157
158 void AOTConstantPoolResolver::dumptime_resolve_constants(InstanceKlass* ik, TRAPS) {
159 if (!ik->is_linked()) {
160 return;
161 }
162 bool first_time;
163 _processed_classes->put_if_absent(ik, &first_time);
164 if (!first_time) {
165 // We have already resolved the constants in class, so no need to do it again.
166 return;
167 }
168
169 constantPoolHandle cp(THREAD, ik->constants());
170 for (int cp_index = 1; cp_index < cp->length(); cp_index++) { // Index 0 is unused
171 switch (cp->tag_at(cp_index).value()) {
172 case JVM_CONSTANT_String:
173 resolve_string(cp, cp_index, CHECK); // may throw OOM when interning strings.
174 break;
175 }
176 }
177
178 // Normally, we don't want to archive any CP entries that were not resolved
179 // in the training run. Otherwise the AOT/JIT may inline too much code that has not
180 // been executed.
181 //
182 // However, we want to aggressively resolve all klass/field/method constants for
183 // LambdaForm Invoker Holder classes, Lambda Proxy classes, and LambdaForm classes,
184 // so that the compiler can inline through them.
185 if (SystemDictionaryShared::is_builtin_loader(ik->class_loader_data())) {
186 bool eager_resolve = false;
187
188 if (LambdaFormInvokers::may_be_regenerated_class(ik->name())) {
189 eager_resolve = true;
190 }
191 if (ik->is_hidden() && HeapShared::is_archivable_hidden_klass(ik)) {
192 eager_resolve = true;
193 }
194
195 if (eager_resolve) {
196 preresolve_class_cp_entries(THREAD, ik, nullptr);
197 preresolve_field_and_method_cp_entries(THREAD, ik, nullptr);
198 }
199 }
200 }
201
202 // This works only for the boot/platform/app loaders
203 Klass* AOTConstantPoolResolver::find_loaded_class(Thread* current, oop class_loader, Symbol* name) {
204 HandleMark hm(current);
205 Handle h_loader(current, class_loader);
206 Klass* k = SystemDictionary::find_instance_or_array_klass(current, name, h_loader);
207 if (k != nullptr) {
208 return k;
209 }
210 if (h_loader() == SystemDictionary::java_system_loader()) {
211 return find_loaded_class(current, SystemDictionary::java_platform_loader(), name);
212 } else if (h_loader() == SystemDictionary::java_platform_loader()) {
213 return find_loaded_class(current, nullptr, name);
214 } else {
215 assert(h_loader() == nullptr, "This function only works for boot/platform/app loaders %p %p %p",
216 cast_from_oop<address>(h_loader()),
217 cast_from_oop<address>(SystemDictionary::java_system_loader()),
218 cast_from_oop<address>(SystemDictionary::java_platform_loader()));
219 }
220
221 return nullptr;
222 }
223
224 Klass* AOTConstantPoolResolver::find_loaded_class(Thread* current, ConstantPool* cp, int class_cp_index) {
225 Symbol* name = cp->klass_name_at(class_cp_index);
226 return find_loaded_class(current, cp->pool_holder()->class_loader(), name);
227 }
228
229 #if INCLUDE_CDS_JAVA_HEAP
230 void AOTConstantPoolResolver::resolve_string(constantPoolHandle cp, int cp_index, TRAPS) {
231 if (CDSConfig::is_dumping_heap()) {
232 int cache_index = cp->cp_to_object_index(cp_index);
233 ConstantPool::string_at_impl(cp, cp_index, cache_index, CHECK);
234 }
235 }
236 #endif
237
238 void AOTConstantPoolResolver::preresolve_class_cp_entries(JavaThread* current, InstanceKlass* ik, GrowableArray<bool>* preresolve_list) {
239 if (!SystemDictionaryShared::is_builtin_loader(ik->class_loader_data())) {
240 return;
241 }
242
243 JavaThread* THREAD = current;
244 constantPoolHandle cp(THREAD, ik->constants());
245 for (int cp_index = 1; cp_index < cp->length(); cp_index++) {
246 if (cp->tag_at(cp_index).value() == JVM_CONSTANT_UnresolvedClass) {
247 if (preresolve_list != nullptr && preresolve_list->at(cp_index) == false) {
248 // This class was not resolved during trial run. Don't attempt to resolve it. Otherwise
249 // the compiler may generate less efficient code.
250 continue;
251 }
252 if (find_loaded_class(current, cp(), cp_index) == nullptr) {
253 // Do not resolve any class that has not been loaded yet
254 continue;
255 }
256 Klass* resolved_klass = cp->klass_at(cp_index, THREAD);
257 if (HAS_PENDING_EXCEPTION) {
258 CLEAR_PENDING_EXCEPTION; // just ignore
259 } else {
260 log_trace(cds, resolve)("Resolved class [%3d] %s -> %s", cp_index, ik->external_name(),
261 resolved_klass->external_name());
262 }
263 }
264 }
265 }
266
267 void AOTConstantPoolResolver::preresolve_field_and_method_cp_entries(JavaThread* current, InstanceKlass* ik, GrowableArray<bool>* preresolve_list) {
268 JavaThread* THREAD = current;
269 constantPoolHandle cp(THREAD, ik->constants());
270 if (cp->cache() == nullptr) {
271 return;
272 }
273 for (int i = 0; i < ik->methods()->length(); i++) {
274 Method* m = ik->methods()->at(i);
275 BytecodeStream bcs(methodHandle(THREAD, m));
276 while (!bcs.is_last_bytecode()) {
277 bcs.next();
278 Bytecodes::Code raw_bc = bcs.raw_code();
279 switch (raw_bc) {
280 case Bytecodes::_getstatic:
281 case Bytecodes::_putstatic:
282 case Bytecodes::_getfield:
283 case Bytecodes::_putfield:
284 maybe_resolve_fmi_ref(ik, m, raw_bc, bcs.get_index_u2(), preresolve_list, THREAD);
285 if (HAS_PENDING_EXCEPTION) {
286 CLEAR_PENDING_EXCEPTION; // just ignore
287 }
288 break;
289 case Bytecodes::_invokehandle:
290 case Bytecodes::_invokespecial:
291 case Bytecodes::_invokevirtual:
292 case Bytecodes::_invokeinterface:
293 case Bytecodes::_invokestatic:
294 maybe_resolve_fmi_ref(ik, m, raw_bc, bcs.get_index_u2(), preresolve_list, THREAD);
295 if (HAS_PENDING_EXCEPTION) {
296 CLEAR_PENDING_EXCEPTION; // just ignore
297 }
298 break;
299 default:
300 break;
301 }
302 }
303 }
304 }
305
306 void AOTConstantPoolResolver::maybe_resolve_fmi_ref(InstanceKlass* ik, Method* m, Bytecodes::Code bc, int raw_index,
307 GrowableArray<bool>* preresolve_list, TRAPS) {
308 methodHandle mh(THREAD, m);
309 constantPoolHandle cp(THREAD, ik->constants());
310 HandleMark hm(THREAD);
311 int cp_index = cp->to_cp_index(raw_index, bc);
312
313 if (cp->is_resolved(raw_index, bc)) {
314 return;
315 }
316
317 if (preresolve_list != nullptr && preresolve_list->at(cp_index) == false) {
318 // This field wasn't resolved during the trial run. Don't attempt to resolve it. Otherwise
319 // the compiler may generate less efficient code.
320 return;
321 }
322
323 int klass_cp_index = cp->uncached_klass_ref_index_at(cp_index);
324 if (find_loaded_class(THREAD, cp(), klass_cp_index) == nullptr) {
325 // Do not resolve any field/methods from a class that has not been loaded yet.
326 return;
327 }
328
329 Klass* resolved_klass = cp->klass_ref_at(raw_index, bc, CHECK);
330 const char* is_static = "";
331
332 switch (bc) {
333 case Bytecodes::_getstatic:
334 case Bytecodes::_putstatic:
335 if (!VM_Version::supports_fast_class_init_checks()) {
336 return; // Do not resolve since interpreter lacks fast clinit barriers support
337 }
338 InterpreterRuntime::resolve_get_put(bc, raw_index, mh, cp, false /*initialize_holder*/, CHECK);
339 is_static = " *** static";
340 break;
341 case Bytecodes::_getfield:
342 case Bytecodes::_putfield:
343 InterpreterRuntime::resolve_get_put(bc, raw_index, mh, cp, false /*initialize_holder*/, CHECK);
344 break;
345
346 case Bytecodes::_invokestatic:
347 if (!VM_Version::supports_fast_class_init_checks()) {
348 return; // Do not resolve since interpreter lacks fast clinit barriers support
349 }
350 InterpreterRuntime::cds_resolve_invoke(bc, raw_index, cp, CHECK);
351 is_static = " *** static";
352 break;
353
354 case Bytecodes::_invokevirtual:
355 case Bytecodes::_invokespecial:
356 case Bytecodes::_invokeinterface:
357 InterpreterRuntime::cds_resolve_invoke(bc, raw_index, cp, CHECK);
358 break;
359
360 case Bytecodes::_invokehandle:
361 InterpreterRuntime::cds_resolve_invokehandle(raw_index, cp, CHECK);
362 break;
363
364 default:
365 ShouldNotReachHere();
366 }
367
368 if (log_is_enabled(Trace, cds, resolve)) {
369 ResourceMark rm(THREAD);
370 bool resolved = cp->is_resolved(raw_index, bc);
371 Symbol* name = cp->name_ref_at(raw_index, bc);
372 Symbol* signature = cp->signature_ref_at(raw_index, bc);
373 log_trace(cds, resolve)("%s %s [%3d] %s -> %s.%s:%s%s",
374 (resolved ? "Resolved" : "Failed to resolve"),
375 Bytecodes::name(bc), cp_index, ik->external_name(),
376 resolved_klass->external_name(),
377 name->as_C_string(), signature->as_C_string(), is_static);
378 }
379 }
380
381 void AOTConstantPoolResolver::preresolve_indy_cp_entries(JavaThread* current, InstanceKlass* ik, GrowableArray<bool>* preresolve_list) {
382 JavaThread* THREAD = current;
383 constantPoolHandle cp(THREAD, ik->constants());
384 if (!CDSConfig::is_dumping_invokedynamic() || cp->cache() == nullptr) {
385 return;
386 }
387
388 assert(preresolve_list != nullptr, "preresolve_indy_cp_entries() should not be called for "
389 "regenerated LambdaForm Invoker classes, which should not have indys anyway.");
390
391 Array<ResolvedIndyEntry>* indy_entries = cp->cache()->resolved_indy_entries();
392 for (int i = 0; i < indy_entries->length(); i++) {
393 ResolvedIndyEntry* rie = indy_entries->adr_at(i);
394 int cp_index = rie->constant_pool_index();
395 if (preresolve_list->at(cp_index) == true) {
396 if (!rie->is_resolved() && is_indy_resolution_deterministic(cp(), cp_index)) {
397 InterpreterRuntime::cds_resolve_invokedynamic(i, cp, THREAD);
398 if (HAS_PENDING_EXCEPTION) {
399 CLEAR_PENDING_EXCEPTION; // just ignore
400 }
401 }
402 if (log_is_enabled(Trace, cds, resolve)) {
403 ResourceMark rm(THREAD);
404 log_trace(cds, resolve)("%s indy [%3d] %s",
405 rie->is_resolved() ? "Resolved" : "Failed to resolve",
406 cp_index, ik->external_name());
407 }
408 }
409 }
410 }
411
412 // Check the MethodType signatures used by parameters to the indy BSMs. Make sure we don't
413 // use types that have been excluded, or else we might end up creating MethodTypes that cannot be stored
414 // in the AOT cache.
415 bool AOTConstantPoolResolver::check_methodtype_signature(ConstantPool* cp, Symbol* sig, Klass** return_type_ret) {
416 ResourceMark rm;
417 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
418 if (ss.is_reference()) {
419 Symbol* type = ss.as_symbol();
420 Klass* k = find_loaded_class(Thread::current(), cp->pool_holder()->class_loader(), type);
421 if (k == nullptr) {
422 return false;
423 }
424
425 if (SystemDictionaryShared::should_be_excluded(k)) {
426 if (log_is_enabled(Warning, cds, resolve)) {
427 ResourceMark rm;
428 log_warning(cds, resolve)("Cannot aot-resolve Lambda proxy because %s is excluded", k->external_name());
429 }
430 return false;
431 }
432
433 if (ss.at_return_type() && return_type_ret != nullptr) {
434 *return_type_ret = k;
435 }
436 }
437 }
438 return true;
439 }
440
441 bool AOTConstantPoolResolver::check_lambda_metafactory_signature(ConstantPool* cp, Symbol* sig) {
442 Klass* k;
443 if (!check_methodtype_signature(cp, sig, &k)) {
444 return false;
445 }
446
447 // <k> is the interface type implemented by the lambda proxy
448 if (!k->is_interface()) {
449 // cp->pool_holder() doesn't look like a valid class generated by javac
450 return false;
451 }
452
453
454 // The linked lambda callsite has an instance of the interface implemented by this lambda. If this
455 // interface requires its <clinit> to be executed, then we must delay the execution to the production run
456 // as <clinit> can have side effects ==> exclude such cases.
457 InstanceKlass* intf = InstanceKlass::cast(k);
458 bool exclude = intf->interface_needs_clinit_execution_as_super();
459 if (log_is_enabled(Debug, cds, resolve)) {
460 ResourceMark rm;
461 log_debug(cds, resolve)("%s aot-resolve Lambda proxy of interface type %s",
462 exclude ? "Cannot" : "Can", k->external_name());
463 }
464 return !exclude;
465 }
466
467 bool AOTConstantPoolResolver::check_lambda_metafactory_methodtype_arg(ConstantPool* cp, int bsms_attribute_index, int arg_i) {
468 int mt_index = cp->operand_argument_index_at(bsms_attribute_index, arg_i);
469 if (!cp->tag_at(mt_index).is_method_type()) {
470 // malformed class?
471 return false;
472 }
473
474 Symbol* sig = cp->method_type_signature_at(mt_index);
475 if (log_is_enabled(Debug, cds, resolve)) {
476 ResourceMark rm;
477 log_debug(cds, resolve)("Checking MethodType for LambdaMetafactory BSM arg %d: %s", arg_i, sig->as_C_string());
478 }
479
480 return check_methodtype_signature(cp, sig);
481 }
482
483 bool AOTConstantPoolResolver::check_lambda_metafactory_methodhandle_arg(ConstantPool* cp, int bsms_attribute_index, int arg_i) {
484 int mh_index = cp->operand_argument_index_at(bsms_attribute_index, arg_i);
485 if (!cp->tag_at(mh_index).is_method_handle()) {
486 // malformed class?
487 return false;
488 }
489
490 Symbol* sig = cp->method_handle_signature_ref_at(mh_index);
491 if (log_is_enabled(Debug, cds, resolve)) {
492 ResourceMark rm;
493 log_debug(cds, resolve)("Checking MethodType of MethodHandle for LambdaMetafactory BSM arg %d: %s", arg_i, sig->as_C_string());
494 }
495 return check_methodtype_signature(cp, sig);
496 }
497
498 bool AOTConstantPoolResolver::is_indy_resolution_deterministic(ConstantPool* cp, int cp_index) {
499 assert(cp->tag_at(cp_index).is_invoke_dynamic(), "sanity");
500 if (!CDSConfig::is_dumping_invokedynamic()) {
501 return false;
502 }
503
504 InstanceKlass* pool_holder = cp->pool_holder();
505 if (!SystemDictionaryShared::is_builtin(pool_holder)) {
506 return false;
507 }
508
509 int bsm = cp->bootstrap_method_ref_index_at(cp_index);
510 int bsm_ref = cp->method_handle_index_at(bsm);
511 Symbol* bsm_name = cp->uncached_name_ref_at(bsm_ref);
512 Symbol* bsm_signature = cp->uncached_signature_ref_at(bsm_ref);
513 Symbol* bsm_klass = cp->klass_name_at(cp->uncached_klass_ref_index_at(bsm_ref));
514
515 // We currently support only StringConcatFactory::makeConcatWithConstants() and LambdaMetafactory::metafactory()
516 // We should mark the allowed BSMs in the JDK code using a private annotation.
517 // See notes on RFE JDK-8342481.
518
519 if (bsm_klass->equals("java/lang/invoke/StringConcatFactory") &&
520 bsm_name->equals("makeConcatWithConstants") &&
521 bsm_signature->equals("(Ljava/lang/invoke/MethodHandles$Lookup;"
522 "Ljava/lang/String;"
523 "Ljava/lang/invoke/MethodType;"
524 "Ljava/lang/String;"
525 "[Ljava/lang/Object;"
526 ")Ljava/lang/invoke/CallSite;")) {
527 Symbol* factory_type_sig = cp->uncached_signature_ref_at(cp_index);
528 if (log_is_enabled(Debug, cds, resolve)) {
529 ResourceMark rm;
530 log_debug(cds, resolve)("Checking StringConcatFactory callsite signature [%d]: %s", cp_index, factory_type_sig->as_C_string());
531 }
532
533 Klass* k;
534 if (!check_methodtype_signature(cp, factory_type_sig, &k)) {
535 return false;
536 }
537 if (k != vmClasses::String_klass()) {
538 // bad class file?
539 return false;
540 }
541
542 return true;
543 }
544
545 if (bsm_klass->equals("java/lang/invoke/LambdaMetafactory") &&
546 bsm_name->equals("metafactory") &&
547 bsm_signature->equals("(Ljava/lang/invoke/MethodHandles$Lookup;"
548 "Ljava/lang/String;"
549 "Ljava/lang/invoke/MethodType;"
550 "Ljava/lang/invoke/MethodType;"
551 "Ljava/lang/invoke/MethodHandle;"
552 "Ljava/lang/invoke/MethodType;"
553 ")Ljava/lang/invoke/CallSite;")) {
554 /*
555 * An indy callsite is associated with the following MethodType and MethodHandles:
556 *
557 * https://github.com/openjdk/jdk/blob/580eb62dc097efeb51c76b095c1404106859b673/src/java.base/share/classes/java/lang/invoke/LambdaMetafactory.java#L293-L309
558 *
559 * MethodType factoryType The expected signature of the {@code CallSite}. The
560 * parameter types represent the types of capture variables;
561 * the return type is the interface to implement. When
562 * used with {@code invokedynamic}, this is provided by
563 * the {@code NameAndType} of the {@code InvokeDynamic}
564 *
565 * MethodType interfaceMethodType Signature and return type of method to be
566 * implemented by the function object.
567 *
568 * MethodHandle implementation A direct method handle describing the implementation
569 * method which should be called (with suitable adaptation
570 * of argument types and return types, and with captured
571 * arguments prepended to the invocation arguments) at
572 * invocation time.
573 *
574 * MethodType dynamicMethodType The signature and return type that should
575 * be enforced dynamically at invocation time.
576 * In simple use cases this is the same as
577 * {@code interfaceMethodType}.
578 */
579 Symbol* factory_type_sig = cp->uncached_signature_ref_at(cp_index);
580 if (log_is_enabled(Debug, cds, resolve)) {
581 ResourceMark rm;
582 log_debug(cds, resolve)("Checking indy callsite signature [%d]: %s", cp_index, factory_type_sig->as_C_string());
583 }
584
585 if (!check_lambda_metafactory_signature(cp, factory_type_sig)) {
586 return false;
587 }
588
589 int bsms_attribute_index = cp->bootstrap_methods_attribute_index(cp_index);
590 int arg_count = cp->operand_argument_count_at(bsms_attribute_index);
591 if (arg_count != 3) {
592 // Malformed class?
593 return false;
594 }
595
596 // interfaceMethodType
597 if (!check_lambda_metafactory_methodtype_arg(cp, bsms_attribute_index, 0)) {
598 return false;
599 }
600
601 // implementation
602 if (!check_lambda_metafactory_methodhandle_arg(cp, bsms_attribute_index, 1)) {
603 return false;
604 }
605
606 // dynamicMethodType
607 if (!check_lambda_metafactory_methodtype_arg(cp, bsms_attribute_index, 2)) {
608 return false;
609 }
610
611 return true;
612 }
613
614 return false;
615 }
616 #ifdef ASSERT
617 bool AOTConstantPoolResolver::is_in_archivebuilder_buffer(address p) {
618 if (!Thread::current()->is_VM_thread() || ArchiveBuilder::current() == nullptr) {
619 return false;
620 } else {
621 return ArchiveBuilder::current()->is_in_buffer_space(p);
622 }
623 }
624 #endif
625
626 int AOTConstantPoolResolver::class_reflection_data_flags(InstanceKlass* ik, TRAPS) {
627 assert(java_lang_Class::has_reflection_data(ik->java_mirror()), "must be");
628
629 HandleMark hm(THREAD);
630 JavaCallArguments args(Handle(THREAD, ik->java_mirror()));
631 JavaValue result(T_INT);
632 JavaCalls::call_special(&result,
633 vmClasses::Class_klass(),
634 vmSymbols::encodeReflectionData_name(),
635 vmSymbols::void_int_signature(),
636 &args, CHECK_0);
637 int flags = result.get_jint();
638 log_info(cds)("Encode ReflectionData: %s (flags=0x%x)", ik->external_name(), flags);
639 return flags;
640 }
641
642 void AOTConstantPoolResolver::generate_reflection_data(JavaThread* current, InstanceKlass* ik, int rd_flags) {
643 log_info(cds)("Generate ReflectionData: %s (flags=" INT32_FORMAT_X ")", ik->external_name(), rd_flags);
644 JavaThread* THREAD = current; // for exception macros
645 JavaCallArguments args(Handle(THREAD, ik->java_mirror()));
646 args.push_int(rd_flags);
647 JavaValue result(T_OBJECT);
648 JavaCalls::call_special(&result,
649 vmClasses::Class_klass(),
650 vmSymbols::generateReflectionData_name(),
651 vmSymbols::int_void_signature(),
652 &args, THREAD);
653 if (HAS_PENDING_EXCEPTION) {
654 Handle exc_handle(THREAD, PENDING_EXCEPTION);
655 CLEAR_PENDING_EXCEPTION;
656
657 log_warning(cds)("Exception during Class::generateReflectionData() call for %s", ik->external_name());
658 LogStreamHandle(Debug, cds) log;
659 if (log.is_enabled()) {
660 java_lang_Throwable::print_stack_trace(exc_handle, &log);
661 }
662 }
663 }
664
665 Klass* AOTConstantPoolResolver::resolve_boot_class_or_fail(const char* class_name, TRAPS) {
666 Handle class_loader;
667 TempNewSymbol class_name_sym = SymbolTable::new_symbol(class_name);
668 return SystemDictionary::resolve_or_fail(class_name_sym, class_loader, true, THREAD);
669 }
670
671 void AOTConstantPoolResolver::trace_dynamic_proxy_class(oop loader, const char* proxy_name, objArrayOop interfaces, int access_flags) {
672 if (interfaces->length() < 1) {
673 return;
674 }
675 if (ClassListWriter::is_enabled()) {
676 const char* loader_name = ArchiveUtils::builtin_loader_name_or_null(loader);
677 if (loader_name != nullptr) {
678 stringStream ss;
679 ss.print("%s %s %d %d", loader_name, proxy_name, access_flags, interfaces->length());
680 for (int i = 0; i < interfaces->length(); i++) {
681 oop mirror = interfaces->obj_at(i);
682 Klass* k = java_lang_Class::as_Klass(mirror);
683 ss.print(" %s", k->name()->as_C_string());
684 }
685 ClassListWriter w;
686 w.stream()->print_cr("@dynamic-proxy %s", ss.freeze());
687 }
688 }
689 if (CDSConfig::is_dumping_preimage_static_archive()) {
690 FinalImageRecipes::add_dynamic_proxy_class(loader, proxy_name, interfaces, access_flags);
691 }
692 }
693
694 void AOTConstantPoolResolver::init_dynamic_proxy_cache(TRAPS) {
695 static bool inited = false;
696 if (inited) {
697 return;
698 }
699 inited = true;
700
701 Klass* klass = resolve_boot_class_or_fail("java/lang/reflect/Proxy", CHECK);
702 TempNewSymbol method = SymbolTable::new_symbol("initCacheForCDS");
703 TempNewSymbol signature = SymbolTable::new_symbol("(Ljava/lang/ClassLoader;Ljava/lang/ClassLoader;)V");
704
705 JavaCallArguments args;
706 args.push_oop(Handle(THREAD, SystemDictionary::java_platform_loader()));
707 args.push_oop(Handle(THREAD, SystemDictionary::java_system_loader()));
708 JavaValue result(T_VOID);
709 JavaCalls::call_static(&result,
710 klass,
711 method,
712 signature,
713 &args, CHECK);
714 }
715
716
717 void AOTConstantPoolResolver::define_dynamic_proxy_class(Handle loader, Handle proxy_name, Handle interfaces, int access_flags, TRAPS) {
718 if (!CDSConfig::is_dumping_dynamic_proxies()) {
719 return;
720 }
721 init_dynamic_proxy_cache(CHECK);
722
723 Klass* klass = resolve_boot_class_or_fail("java/lang/reflect/Proxy$ProxyBuilder", CHECK);
724 TempNewSymbol method = SymbolTable::new_symbol("defineProxyClassForCDS");
725 TempNewSymbol signature = SymbolTable::new_symbol("(Ljava/lang/ClassLoader;Ljava/lang/String;[Ljava/lang/Class;I)Ljava/lang/Class;");
726
727 JavaCallArguments args;
728 args.push_oop(Handle(THREAD, loader()));
729 args.push_oop(Handle(THREAD, proxy_name()));
730 args.push_oop(Handle(THREAD, interfaces()));
731 args.push_int(access_flags);
732 JavaValue result(T_OBJECT);
733 JavaCalls::call_static(&result,
734 klass,
735 method,
736 signature,
737 &args, CHECK);
738
739 // Assumptions:
740 // FMG is archived, which means -modulepath and -Xbootclasspath are both not specified.
741 // All named modules are loaded from the system modules files.
742 // TODO: test support for -Xbootclasspath after JDK-8322322. Some of the code below need to be changed.
743 // TODO: we just give dummy shared_classpath_index for the generated class so that it will be archived.
744 // The index is not used at runtime (see SystemDictionaryShared::load_shared_class_for_builtin_loader, which
745 // uses a null ProtectionDomain for this class)
746 oop mirror = result.get_oop();
747 assert(mirror != nullptr, "class must have been generated if not OOM");
748 InstanceKlass* ik = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
749 if (ik->is_shared_boot_class() || ik->is_shared_platform_class()) {
750 assert(ik->module()->is_named(), "dynamic proxies defined in unnamed modules for boot/platform loaders not supported");
751 ik->set_shared_classpath_index(0);
752 } else {
753 assert(ik->is_shared_app_class(), "must be");
754 ik->set_shared_classpath_index(AOTClassLocationConfig::dumptime()->app_cp_start_index());
755 }
756
757 ArchiveBuilder::alloc_stats()->record_dynamic_proxy_class();
758 if (log_is_enabled(Info, cds, dynamic, proxy)) {
759 ResourceMark rm(THREAD);
760 stringStream ss;
761 const char* prefix = "";
762 ss.print("%s (%-7s, cp index = %d) implements ", ik->external_name(),
763 ArchiveUtils::builtin_loader_name(loader()), ik->shared_classpath_index());
764 objArrayOop intfs = (objArrayOop)interfaces();
765 for (int i = 0; i < intfs->length(); i++) {
766 oop intf_mirror = intfs->obj_at(i);
767 ss.print("%s%s", prefix, java_lang_Class::as_Klass(intf_mirror)->external_name());
768 prefix = ", ";
769 }
770
771 log_info(cds, dynamic, proxy)("%s", ss.freeze());
772 }
773 }