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/aotConstantPoolResolver.hpp"
27 #include "cds/archiveBuilder.hpp"
28 #include "cds/cdsConfig.hpp"
29 #include "classfile/systemDictionary.hpp"
30 #include "classfile/systemDictionaryShared.hpp"
31 #include "classfile/vmClasses.hpp"
32 #include "interpreter/bytecodeStream.hpp"
33 #include "interpreter/interpreterRuntime.hpp"
34 #include "memory/resourceArea.hpp"
35 #include "oops/constantPool.inline.hpp"
36 #include "oops/instanceKlass.hpp"
37 #include "oops/klass.inline.hpp"
38 #include "runtime/handles.inline.hpp"
39
40 // Returns true if we CAN PROVE that cp_index will always resolve to
41 // the same information at both dump time and run time. This is a
42 // necessary (but not sufficient) condition for pre-resolving cp_index
43 // during CDS archive assembly.
44 bool AOTConstantPoolResolver::is_resolution_deterministic(ConstantPool* cp, int cp_index) {
45 assert(!is_in_archivebuilder_buffer(cp), "sanity");
46
47 if (cp->tag_at(cp_index).is_klass()) {
48 // We require cp_index to be already resolved. This is fine for now, are we
49 // currently archive only CP entries that are already resolved.
50 Klass* resolved_klass = cp->resolved_klass_at(cp_index);
51 return resolved_klass != nullptr && is_class_resolution_deterministic(cp->pool_holder(), resolved_klass);
52 } else if (cp->tag_at(cp_index).is_invoke_dynamic()) {
53 return is_indy_resolution_deterministic(cp, cp_index);
54 } else if (cp->tag_at(cp_index).is_field() ||
55 cp->tag_at(cp_index).is_method() ||
56 cp->tag_at(cp_index).is_interface_method()) {
57 int klass_cp_index = cp->uncached_klass_ref_index_at(cp_index);
58 if (!cp->tag_at(klass_cp_index).is_klass()) {
59 // Not yet resolved
60 return false;
61 }
62 Klass* k = cp->resolved_klass_at(klass_cp_index);
63 if (!is_class_resolution_deterministic(cp->pool_holder(), k)) {
64 return false;
65 }
66
67 if (!k->is_instance_klass()) {
68 // TODO: support non instance klasses as well.
69 return false;
70 }
71
72 // Here, We don't check if this entry can actually be resolved to a valid Field/Method.
73 // This method should be called by the ConstantPool to check Fields/Methods that
74 // have already been successfully resolved.
75 return true;
76 } else {
77 return false;
78 }
79 }
80
81 bool AOTConstantPoolResolver::is_class_resolution_deterministic(InstanceKlass* cp_holder, Klass* resolved_class) {
82 assert(!is_in_archivebuilder_buffer(cp_holder), "sanity");
83 assert(!is_in_archivebuilder_buffer(resolved_class), "sanity");
84
85 if (resolved_class->is_instance_klass()) {
86 InstanceKlass* ik = InstanceKlass::cast(resolved_class);
87
88 if (!ik->in_aot_cache() && SystemDictionaryShared::is_excluded_class(ik)) {
89 return false;
90 }
91
92 if (cp_holder->is_subtype_of(ik)) {
93 // All super types of ik will be resolved in ik->class_loader() before
94 // ik is defined in this loader, so it's safe to archive the resolved klass reference.
95 return true;
96 }
97
98 if (CDSConfig::is_dumping_aot_linked_classes()) {
99 // Need to call try_add_candidate instead of is_candidate, as this may be called
100 // before AOTClassLinker::add_candidates().
101 if (AOTClassLinker::try_add_candidate(ik)) {
102 return true;
103 } else {
104 return false;
105 }
106 } else if (AOTClassLinker::is_vm_class(ik)) {
107 if (ik->class_loader() != cp_holder->class_loader()) {
108 // At runtime, cp_holder() may not be able to resolve to the same
109 // ik. For example, a different version of ik may be defined in
110 // cp->pool_holder()'s loader using MethodHandles.Lookup.defineClass().
111 return false;
112 } else {
113 return true;
114 }
115 } else {
116 return false;
117 }
118 } else if (resolved_class->is_objArray_klass()) {
119 if (CDSConfig::is_dumping_dynamic_archive()) {
120 // This is difficult to handle. See JDK-8374639
121 return false;
122 }
123 Klass* elem = ObjArrayKlass::cast(resolved_class)->bottom_klass();
124 if (elem->is_instance_klass()) {
125 return is_class_resolution_deterministic(cp_holder, InstanceKlass::cast(elem));
126 } else if (elem->is_typeArray_klass()) {
127 return true;
128 } else {
129 return false;
130 }
131 } else if (resolved_class->is_typeArray_klass()) {
132 return true;
133 } else {
134 return false;
135 }
136 }
137
138 void AOTConstantPoolResolver::preresolve_string_cp_entries(InstanceKlass* ik, TRAPS) {
139 if (!ik->is_linked()) {
140 // The cp->resolved_referenced() array is not ready yet, so we can't call resolve_string().
141 return;
142 }
143 constantPoolHandle cp(THREAD, ik->constants());
144 for (int cp_index = 1; cp_index < cp->length(); cp_index++) { // Index 0 is unused
145 switch (cp->tag_at(cp_index).value()) {
146 case JVM_CONSTANT_String:
147 resolve_string(cp, cp_index, CHECK); // may throw OOM when interning strings.
148 break;
149 }
150 }
151 }
152
153 // This works only for the boot/platform/app loaders
154 Klass* AOTConstantPoolResolver::find_loaded_class(Thread* current, oop class_loader, Symbol* name) {
155 HandleMark hm(current);
156 Handle h_loader(current, class_loader);
157 Klass* k = SystemDictionary::find_instance_or_array_klass(current, name, h_loader);
158 if (k != nullptr) {
159 return k;
160 }
161 if (h_loader() == SystemDictionary::java_system_loader()) {
162 return find_loaded_class(current, SystemDictionary::java_platform_loader(), name);
163 } else if (h_loader() == SystemDictionary::java_platform_loader()) {
164 return find_loaded_class(current, nullptr, name);
165 } else {
166 assert(h_loader() == nullptr, "This function only works for boot/platform/app loaders %p %p %p",
167 cast_from_oop<address>(h_loader()),
168 cast_from_oop<address>(SystemDictionary::java_system_loader()),
169 cast_from_oop<address>(SystemDictionary::java_platform_loader()));
170 }
171
172 return nullptr;
173 }
174
175 Klass* AOTConstantPoolResolver::find_loaded_class(Thread* current, ConstantPool* cp, int class_cp_index) {
176 Symbol* name = cp->klass_name_at(class_cp_index);
177 return find_loaded_class(current, cp->pool_holder()->class_loader(), name);
178 }
179
180 #if INCLUDE_CDS_JAVA_HEAP
181 void AOTConstantPoolResolver::resolve_string(constantPoolHandle cp, int cp_index, TRAPS) {
182 if (CDSConfig::is_dumping_heap()) {
183 int cache_index = cp->cp_to_object_index(cp_index);
184 ConstantPool::string_at_impl(cp, cp_index, cache_index, CHECK);
185 }
186 }
187 #endif
188
189 void AOTConstantPoolResolver::preresolve_class_cp_entries(JavaThread* current, InstanceKlass* ik, GrowableArray<bool>* preresolve_list) {
190 if (!SystemDictionaryShared::is_builtin_loader(ik->class_loader_data())) {
191 return;
192 }
193
194 JavaThread* THREAD = current;
195 constantPoolHandle cp(THREAD, ik->constants());
196 for (int cp_index = 1; cp_index < cp->length(); cp_index++) {
197 if (cp->tag_at(cp_index).value() == JVM_CONSTANT_UnresolvedClass) {
198 if (preresolve_list != nullptr && preresolve_list->at(cp_index) == false) {
199 // This class was not resolved during trial run. Don't attempt to resolve it. Otherwise
200 // the compiler may generate less efficient code.
201 continue;
202 }
203 if (find_loaded_class(current, cp(), cp_index) == nullptr) {
204 // Do not resolve any class that has not been loaded yet
205 continue;
206 }
207 Klass* resolved_klass = cp->klass_at(cp_index, THREAD);
208 if (HAS_PENDING_EXCEPTION) {
209 CLEAR_PENDING_EXCEPTION; // just ignore
210 } else {
211 log_trace(aot, resolve)("Resolved class [%3d] %s -> %s", cp_index, ik->external_name(),
212 resolved_klass->external_name());
213 }
214 }
215 }
216 }
217
218 void AOTConstantPoolResolver::preresolve_field_and_method_cp_entries(JavaThread* current, InstanceKlass* ik, GrowableArray<bool>* preresolve_list) {
219 JavaThread* THREAD = current;
220 constantPoolHandle cp(THREAD, ik->constants());
221 if (cp->cache() == nullptr) {
222 return;
223 }
224 for (int i = 0; i < ik->methods()->length(); i++) {
225 Method* m = ik->methods()->at(i);
226 BytecodeStream bcs(methodHandle(THREAD, m));
227 while (!bcs.is_last_bytecode()) {
228 bcs.next();
229 Bytecodes::Code raw_bc = bcs.raw_code();
230 switch (raw_bc) {
231 case Bytecodes::_getstatic:
232 case Bytecodes::_putstatic:
233 maybe_resolve_fmi_ref(ik, m, raw_bc, bcs.get_index_u2(), preresolve_list, THREAD);
234 if (HAS_PENDING_EXCEPTION) {
235 CLEAR_PENDING_EXCEPTION; // just ignore
236 }
237 break;
238 case Bytecodes::_getfield:
239 // no-fast bytecode
240 case Bytecodes::_nofast_getfield:
241 // fast bytecodes
242 case Bytecodes::_fast_agetfield:
243 case Bytecodes::_fast_bgetfield:
244 case Bytecodes::_fast_cgetfield:
245 case Bytecodes::_fast_dgetfield:
246 case Bytecodes::_fast_fgetfield:
247 case Bytecodes::_fast_igetfield:
248 case Bytecodes::_fast_lgetfield:
249 case Bytecodes::_fast_sgetfield:
250 raw_bc = Bytecodes::_getfield;
251 maybe_resolve_fmi_ref(ik, m, raw_bc, bcs.get_index_u2(), preresolve_list, THREAD);
252 if (HAS_PENDING_EXCEPTION) {
253 CLEAR_PENDING_EXCEPTION; // just ignore
254 }
255 break;
256
257 case Bytecodes::_putfield:
258 // no-fast bytecode
259 case Bytecodes::_nofast_putfield:
260 // fast bytecodes
261 case Bytecodes::_fast_aputfield:
262 case Bytecodes::_fast_bputfield:
263 case Bytecodes::_fast_zputfield:
264 case Bytecodes::_fast_cputfield:
265 case Bytecodes::_fast_dputfield:
266 case Bytecodes::_fast_fputfield:
267 case Bytecodes::_fast_iputfield:
268 case Bytecodes::_fast_lputfield:
269 case Bytecodes::_fast_sputfield:
270 raw_bc = Bytecodes::_putfield;
271 maybe_resolve_fmi_ref(ik, m, raw_bc, bcs.get_index_u2(), preresolve_list, THREAD);
272 if (HAS_PENDING_EXCEPTION) {
273 CLEAR_PENDING_EXCEPTION; // just ignore
274 }
275 break;
276 case Bytecodes::_invokehandle:
277 case Bytecodes::_invokespecial:
278 case Bytecodes::_invokevirtual:
279 case Bytecodes::_invokeinterface:
280 case Bytecodes::_invokestatic:
281 maybe_resolve_fmi_ref(ik, m, raw_bc, bcs.get_index_u2(), preresolve_list, THREAD);
282 if (HAS_PENDING_EXCEPTION) {
283 CLEAR_PENDING_EXCEPTION; // just ignore
284 }
285 break;
286 default:
287 break;
288 }
289 }
290 }
291 }
292
293 void AOTConstantPoolResolver::maybe_resolve_fmi_ref(InstanceKlass* ik, Method* m, Bytecodes::Code bc, int raw_index,
294 GrowableArray<bool>* preresolve_list, TRAPS) {
295 methodHandle mh(THREAD, m);
296 constantPoolHandle cp(THREAD, ik->constants());
297 HandleMark hm(THREAD);
298 int cp_index = cp->to_cp_index(raw_index, bc);
299
300 if (cp->is_resolved(raw_index, bc)) {
301 return;
302 }
303
304 if (preresolve_list != nullptr && preresolve_list->at(cp_index) == false) {
305 // This field wasn't resolved during the trial run. Don't attempt to resolve it. Otherwise
306 // the compiler may generate less efficient code.
307 return;
308 }
309
310 int klass_cp_index = cp->uncached_klass_ref_index_at(cp_index);
311 if (find_loaded_class(THREAD, cp(), klass_cp_index) == nullptr) {
312 // Do not resolve any field/methods from a class that has not been loaded yet.
313 return;
314 }
315
316 Klass* resolved_klass = cp->klass_ref_at(raw_index, bc, CHECK);
317 const char* is_static = "";
318
319 switch (bc) {
320 case Bytecodes::_getstatic:
321 case Bytecodes::_putstatic:
322 if (!VM_Version::supports_fast_class_init_checks()) {
323 return; // Do not resolve since interpreter lacks fast clinit barriers support
324 }
325 InterpreterRuntime::resolve_get_put(bc, raw_index, mh, cp, ClassInitMode::dont_init, CHECK);
326 is_static = " *** static";
327 break;
328
329 case Bytecodes::_getfield:
330 case Bytecodes::_putfield:
331 InterpreterRuntime::resolve_get_put(bc, raw_index, mh, cp, ClassInitMode::dont_init, CHECK);
332 break;
333
334 case Bytecodes::_invokestatic:
335 if (!VM_Version::supports_fast_class_init_checks()) {
336 return; // Do not resolve since interpreter lacks fast clinit barriers support
337 }
338 InterpreterRuntime::cds_resolve_invoke(bc, raw_index, cp, CHECK);
339 is_static = " *** static";
340 break;
341
342 case Bytecodes::_invokevirtual:
343 case Bytecodes::_invokespecial:
344 case Bytecodes::_invokeinterface:
345 InterpreterRuntime::cds_resolve_invoke(bc, raw_index, cp, CHECK);
346 break;
347
348 case Bytecodes::_invokehandle:
349 InterpreterRuntime::cds_resolve_invokehandle(raw_index, cp, CHECK);
350 break;
351
352 default:
353 ShouldNotReachHere();
354 }
355
356 if (log_is_enabled(Trace, aot, resolve)) {
357 ResourceMark rm(THREAD);
358 bool resolved = cp->is_resolved(raw_index, bc);
359 Symbol* name = cp->name_ref_at(raw_index, bc);
360 Symbol* signature = cp->signature_ref_at(raw_index, bc);
361 log_trace(aot, resolve)("%s %s [%3d] %s -> %s.%s:%s%s",
362 (resolved ? "Resolved" : "Failed to resolve"),
363 Bytecodes::name(bc), cp_index, ik->external_name(),
364 resolved_klass->external_name(),
365 name->as_C_string(), signature->as_C_string(), is_static);
366 }
367 }
368
369 void AOTConstantPoolResolver::preresolve_indy_cp_entries(JavaThread* current, InstanceKlass* ik, GrowableArray<bool>* preresolve_list) {
370 JavaThread* THREAD = current;
371 constantPoolHandle cp(THREAD, ik->constants());
372 if (!CDSConfig::is_dumping_invokedynamic() || cp->cache() == nullptr) {
373 return;
374 }
375
376 assert(preresolve_list != nullptr, "preresolve_indy_cp_entries() should not be called for "
377 "regenerated LambdaForm Invoker classes, which should not have indys anyway.");
378
379 Array<ResolvedIndyEntry>* indy_entries = cp->cache()->resolved_indy_entries();
380 for (int i = 0; i < indy_entries->length(); i++) {
381 ResolvedIndyEntry* rie = indy_entries->adr_at(i);
382 int cp_index = rie->constant_pool_index();
383 if (preresolve_list->at(cp_index) == true) {
384 if (!rie->is_resolved() && is_indy_resolution_deterministic(cp(), cp_index)) {
385 InterpreterRuntime::cds_resolve_invokedynamic(i, cp, THREAD);
386 if (HAS_PENDING_EXCEPTION) {
387 CLEAR_PENDING_EXCEPTION; // just ignore
388 }
389 }
390 if (log_is_enabled(Trace, aot, resolve)) {
391 ResourceMark rm(THREAD);
392 log_trace(aot, resolve)("%s indy [%3d] %s",
393 rie->is_resolved() ? "Resolved" : "Failed to resolve",
394 cp_index, ik->external_name());
395 }
396 }
397 }
398 }
399
400 // Check the MethodType signatures used by parameters to the indy BSMs. Make sure we don't
401 // use types that have been excluded, or else we might end up creating MethodTypes that cannot be stored
402 // in the AOT cache.
403 bool AOTConstantPoolResolver::check_methodtype_signature(ConstantPool* cp, Symbol* sig, Klass** return_type_ret) {
404 ResourceMark rm;
405 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
406 if (ss.is_reference()) {
407 Symbol* type = ss.as_symbol();
408 Klass* k = find_loaded_class(Thread::current(), cp->pool_holder()->class_loader(), type);
409 if (k == nullptr) {
410 return false;
411 }
412
413 if (SystemDictionaryShared::should_be_excluded(k)) {
414 if (log_is_enabled(Warning, aot, resolve)) {
415 ResourceMark rm;
416 log_warning(aot, resolve)("Cannot aot-resolve Lambda proxy because %s is excluded", k->external_name());
417 }
418 return false;
419 }
420
421 if (ss.at_return_type() && return_type_ret != nullptr) {
422 *return_type_ret = k;
423 }
424 }
425 }
426 return true;
427 }
428
429 bool AOTConstantPoolResolver::check_lambda_metafactory_signature(ConstantPool* cp, Symbol* sig) {
430 Klass* k;
431 if (!check_methodtype_signature(cp, sig, &k)) {
432 return false;
433 }
434
435 // <k> is the interface type implemented by the lambda proxy
436 if (!k->is_interface()) {
437 // cp->pool_holder() doesn't look like a valid class generated by javac
438 return false;
439 }
440
441
442 // The linked lambda callsite has an instance of the interface implemented by this lambda. If this
443 // interface requires its <clinit> to be executed, then we must delay the execution to the production run
444 // as <clinit> can have side effects ==> exclude such cases.
445 InstanceKlass* intf = InstanceKlass::cast(k);
446 bool exclude = intf->interface_needs_clinit_execution_as_super();
447 if (log_is_enabled(Debug, aot, resolve)) {
448 ResourceMark rm;
449 log_debug(aot, resolve)("%s aot-resolve Lambda proxy of interface type %s",
450 exclude ? "Cannot" : "Can", k->external_name());
451 }
452 return !exclude;
453 }
454
455 bool AOTConstantPoolResolver::check_lambda_metafactory_methodtype_arg(ConstantPool* cp, int bsms_attribute_index, int arg_i) {
456 int mt_index = cp->bsm_attribute_entry(bsms_attribute_index)->argument(arg_i);
457 if (!cp->tag_at(mt_index).is_method_type()) {
458 // malformed class?
459 return false;
460 }
461
462 Symbol* sig = cp->method_type_signature_at(mt_index);
463 if (log_is_enabled(Debug, aot, resolve)) {
464 ResourceMark rm;
465 log_debug(aot, resolve)("Checking MethodType for LambdaMetafactory BSM arg %d: %s", arg_i, sig->as_C_string());
466 }
467
468 return check_methodtype_signature(cp, sig);
469 }
470
471 bool AOTConstantPoolResolver::check_lambda_metafactory_methodhandle_arg(ConstantPool* cp, int bsms_attribute_index, int arg_i) {
472 int mh_index = cp->bsm_attribute_entry(bsms_attribute_index)->argument(arg_i);
473 if (!cp->tag_at(mh_index).is_method_handle()) {
474 // malformed class?
475 return false;
476 }
477
478 Symbol* sig = cp->method_handle_signature_ref_at(mh_index);
479 if (log_is_enabled(Debug, aot, resolve)) {
480 ResourceMark rm;
481 log_debug(aot, resolve)("Checking MethodType of MethodHandle for LambdaMetafactory BSM arg %d: %s", arg_i, sig->as_C_string());
482 }
483 return check_methodtype_signature(cp, sig);
484 }
485
486 bool AOTConstantPoolResolver::is_indy_resolution_deterministic(ConstantPool* cp, int cp_index) {
487 assert(cp->tag_at(cp_index).is_invoke_dynamic(), "sanity");
488 if (!CDSConfig::is_dumping_invokedynamic()) {
489 return false;
490 }
491
492 InstanceKlass* pool_holder = cp->pool_holder();
493 if (!SystemDictionaryShared::is_builtin(pool_holder)) {
494 return false;
495 }
496
497 int bsm = cp->bootstrap_method_ref_index_at(cp_index);
498 int bsm_ref = cp->method_handle_index_at(bsm);
499 Symbol* bsm_name = cp->uncached_name_ref_at(bsm_ref);
500 Symbol* bsm_signature = cp->uncached_signature_ref_at(bsm_ref);
501 Symbol* bsm_klass = cp->klass_name_at(cp->uncached_klass_ref_index_at(bsm_ref));
502
503 // We currently support only StringConcatFactory::makeConcatWithConstants() and LambdaMetafactory::metafactory()
504 // We should mark the allowed BSMs in the JDK code using a private annotation.
505 // See notes on RFE JDK-8342481.
506
507 if (bsm_klass->equals("java/lang/invoke/StringConcatFactory") &&
508 bsm_name->equals("makeConcatWithConstants") &&
509 bsm_signature->equals("(Ljava/lang/invoke/MethodHandles$Lookup;"
510 "Ljava/lang/String;"
511 "Ljava/lang/invoke/MethodType;"
512 "Ljava/lang/String;"
513 "[Ljava/lang/Object;"
514 ")Ljava/lang/invoke/CallSite;")) {
515 Symbol* factory_type_sig = cp->uncached_signature_ref_at(cp_index);
516 if (log_is_enabled(Debug, aot, resolve)) {
517 ResourceMark rm;
518 log_debug(aot, resolve)("Checking StringConcatFactory callsite signature [%d]: %s", cp_index, factory_type_sig->as_C_string());
519 }
520
521 Klass* k;
522 if (!check_methodtype_signature(cp, factory_type_sig, &k)) {
523 return false;
524 }
525 if (k != vmClasses::String_klass()) {
526 // bad class file?
527 return false;
528 }
529
530 return true;
531 }
532
533 if (bsm_klass->equals("java/lang/invoke/LambdaMetafactory") &&
534 bsm_name->equals("metafactory") &&
535 bsm_signature->equals("(Ljava/lang/invoke/MethodHandles$Lookup;"
536 "Ljava/lang/String;"
537 "Ljava/lang/invoke/MethodType;"
538 "Ljava/lang/invoke/MethodType;"
539 "Ljava/lang/invoke/MethodHandle;"
540 "Ljava/lang/invoke/MethodType;"
541 ")Ljava/lang/invoke/CallSite;")) {
542 /*
543 * An indy callsite is associated with the following MethodType and MethodHandles:
544 *
545 * https://github.com/openjdk/jdk/blob/580eb62dc097efeb51c76b095c1404106859b673/src/java.base/share/classes/java/lang/invoke/LambdaMetafactory.java#L293-L309
546 *
547 * MethodType factoryType The expected signature of the {@code CallSite}. The
548 * parameter types represent the types of capture variables;
549 * the return type is the interface to implement. When
550 * used with {@code invokedynamic}, this is provided by
551 * the {@code NameAndType} of the {@code InvokeDynamic}
552 *
553 * MethodType interfaceMethodType Signature and return type of method to be
554 * implemented by the function object.
555 *
556 * MethodHandle implementation A direct method handle describing the implementation
557 * method which should be called (with suitable adaptation
558 * of argument types and return types, and with captured
559 * arguments prepended to the invocation arguments) at
560 * invocation time.
561 *
562 * MethodType dynamicMethodType The signature and return type that should
563 * be enforced dynamically at invocation time.
564 * In simple use cases this is the same as
565 * {@code interfaceMethodType}.
566 */
567 Symbol* factory_type_sig = cp->uncached_signature_ref_at(cp_index);
568 if (log_is_enabled(Debug, aot, resolve)) {
569 ResourceMark rm;
570 log_debug(aot, resolve)("Checking lambda callsite signature [%d]: %s", cp_index, factory_type_sig->as_C_string());
571 }
572
573 if (!check_lambda_metafactory_signature(cp, factory_type_sig)) {
574 return false;
575 }
576
577 int bsms_attribute_index = cp->bootstrap_methods_attribute_index(cp_index);
578 int arg_count = cp->bsm_attribute_entry(bsms_attribute_index)->argument_count();
579 if (arg_count != 3) {
580 // Malformed class?
581 return false;
582 }
583
584 // interfaceMethodType
585 if (!check_lambda_metafactory_methodtype_arg(cp, bsms_attribute_index, 0)) {
586 return false;
587 }
588
589 // implementation
590 if (!check_lambda_metafactory_methodhandle_arg(cp, bsms_attribute_index, 1)) {
591 return false;
592 }
593
594 // dynamicMethodType
595 if (!check_lambda_metafactory_methodtype_arg(cp, bsms_attribute_index, 2)) {
596 return false;
597 }
598
599 return true;
600 }
601
602 return false;
603 }
604 #ifdef ASSERT
605 bool AOTConstantPoolResolver::is_in_archivebuilder_buffer(address p) {
606 if (!Thread::current()->is_VM_thread() || ArchiveBuilder::current() == nullptr) {
607 return false;
608 } else {
609 return ArchiveBuilder::current()->is_in_buffer_space(p);
610 }
611 }
612 #endif