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/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 Klass* elem = ObjArrayKlass::cast(resolved_class)->bottom_klass();
120 if (elem->is_instance_klass()) {
121 return is_class_resolution_deterministic(cp_holder, InstanceKlass::cast(elem));
122 } else if (elem->is_typeArray_klass()) {
123 return true;
124 } else {
125 return false;
126 }
127 } else if (resolved_class->is_typeArray_klass()) {
128 return true;
129 } else {
130 return false;
131 }
132 }
133
134 void AOTConstantPoolResolver::preresolve_string_cp_entries(InstanceKlass* ik, TRAPS) {
135 if (!ik->is_linked()) {
136 // The cp->resolved_referenced() array is not ready yet, so we can't call resolve_string().
137 return;
138 }
139 constantPoolHandle cp(THREAD, ik->constants());
140 for (int cp_index = 1; cp_index < cp->length(); cp_index++) { // Index 0 is unused
141 switch (cp->tag_at(cp_index).value()) {
142 case JVM_CONSTANT_String:
143 resolve_string(cp, cp_index, CHECK); // may throw OOM when interning strings.
144 break;
145 }
146 }
147 }
148
149 // This works only for the boot/platform/app loaders
150 Klass* AOTConstantPoolResolver::find_loaded_class(Thread* current, oop class_loader, Symbol* name) {
151 HandleMark hm(current);
152 Handle h_loader(current, class_loader);
153 Klass* k = SystemDictionary::find_instance_or_array_klass(current, name, h_loader);
154 if (k != nullptr) {
155 return k;
156 }
157 if (h_loader() == SystemDictionary::java_system_loader()) {
158 return find_loaded_class(current, SystemDictionary::java_platform_loader(), name);
159 } else if (h_loader() == SystemDictionary::java_platform_loader()) {
160 return find_loaded_class(current, nullptr, name);
161 } else {
162 assert(h_loader() == nullptr, "This function only works for boot/platform/app loaders %p %p %p",
163 cast_from_oop<address>(h_loader()),
164 cast_from_oop<address>(SystemDictionary::java_system_loader()),
165 cast_from_oop<address>(SystemDictionary::java_platform_loader()));
166 }
167
168 return nullptr;
169 }
170
171 Klass* AOTConstantPoolResolver::find_loaded_class(Thread* current, ConstantPool* cp, int class_cp_index) {
172 Symbol* name = cp->klass_name_at(class_cp_index);
173 return find_loaded_class(current, cp->pool_holder()->class_loader(), name);
174 }
175
176 #if INCLUDE_CDS_JAVA_HEAP
177 void AOTConstantPoolResolver::resolve_string(constantPoolHandle cp, int cp_index, TRAPS) {
178 if (CDSConfig::is_dumping_heap()) {
179 int cache_index = cp->cp_to_object_index(cp_index);
180 ConstantPool::string_at_impl(cp, cp_index, cache_index, CHECK);
181 }
182 }
183 #endif
184
185 void AOTConstantPoolResolver::preresolve_class_cp_entries(JavaThread* current, InstanceKlass* ik, GrowableArray<bool>* preresolve_list) {
186 if (!SystemDictionaryShared::is_builtin_loader(ik->class_loader_data())) {
187 return;
188 }
189
190 JavaThread* THREAD = current;
191 constantPoolHandle cp(THREAD, ik->constants());
192 for (int cp_index = 1; cp_index < cp->length(); cp_index++) {
193 if (cp->tag_at(cp_index).value() == JVM_CONSTANT_UnresolvedClass) {
194 if (preresolve_list != nullptr && preresolve_list->at(cp_index) == false) {
195 // This class was not resolved during trial run. Don't attempt to resolve it. Otherwise
196 // the compiler may generate less efficient code.
197 continue;
198 }
199 if (find_loaded_class(current, cp(), cp_index) == nullptr) {
200 // Do not resolve any class that has not been loaded yet
201 continue;
202 }
203 Klass* resolved_klass = cp->klass_at(cp_index, THREAD);
204 if (HAS_PENDING_EXCEPTION) {
205 CLEAR_PENDING_EXCEPTION; // just ignore
206 } else {
207 log_trace(aot, resolve)("Resolved class [%3d] %s -> %s", cp_index, ik->external_name(),
208 resolved_klass->external_name());
209 }
210 }
211 }
212 }
213
214 void AOTConstantPoolResolver::preresolve_field_and_method_cp_entries(JavaThread* current, InstanceKlass* ik, GrowableArray<bool>* preresolve_list) {
215 JavaThread* THREAD = current;
216 constantPoolHandle cp(THREAD, ik->constants());
217 if (cp->cache() == nullptr) {
218 return;
219 }
220 for (int i = 0; i < ik->methods()->length(); i++) {
221 Method* m = ik->methods()->at(i);
222 BytecodeStream bcs(methodHandle(THREAD, m));
223 while (!bcs.is_last_bytecode()) {
224 bcs.next();
225 Bytecodes::Code raw_bc = bcs.raw_code();
226 switch (raw_bc) {
227 case Bytecodes::_getstatic:
228 case Bytecodes::_putstatic:
229 maybe_resolve_fmi_ref(ik, m, raw_bc, bcs.get_index_u2(), preresolve_list, THREAD);
230 if (HAS_PENDING_EXCEPTION) {
231 CLEAR_PENDING_EXCEPTION; // just ignore
232 }
233 break;
234 case Bytecodes::_getfield:
235 // no-fast bytecode
236 case Bytecodes::_nofast_getfield:
237 // fast bytecodes
238 case Bytecodes::_fast_agetfield:
239 case Bytecodes::_fast_bgetfield:
240 case Bytecodes::_fast_cgetfield:
241 case Bytecodes::_fast_dgetfield:
242 case Bytecodes::_fast_fgetfield:
243 case Bytecodes::_fast_igetfield:
244 case Bytecodes::_fast_lgetfield:
245 case Bytecodes::_fast_sgetfield:
246 raw_bc = Bytecodes::_getfield;
247 maybe_resolve_fmi_ref(ik, m, raw_bc, bcs.get_index_u2(), preresolve_list, THREAD);
248 if (HAS_PENDING_EXCEPTION) {
249 CLEAR_PENDING_EXCEPTION; // just ignore
250 }
251 break;
252
253 case Bytecodes::_putfield:
254 // no-fast bytecode
255 case Bytecodes::_nofast_putfield:
256 // fast bytecodes
257 case Bytecodes::_fast_aputfield:
258 case Bytecodes::_fast_bputfield:
259 case Bytecodes::_fast_zputfield:
260 case Bytecodes::_fast_cputfield:
261 case Bytecodes::_fast_dputfield:
262 case Bytecodes::_fast_fputfield:
263 case Bytecodes::_fast_iputfield:
264 case Bytecodes::_fast_lputfield:
265 case Bytecodes::_fast_sputfield:
266 raw_bc = 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, ClassInitMode::dont_init, CHECK);
322 is_static = " *** static";
323 break;
324
325 case Bytecodes::_getfield:
326 case Bytecodes::_putfield:
327 InterpreterRuntime::resolve_get_put(bc, raw_index, mh, cp, ClassInitMode::dont_init, CHECK);
328 break;
329
330 case Bytecodes::_invokestatic:
331 if (!VM_Version::supports_fast_class_init_checks()) {
332 return; // Do not resolve since interpreter lacks fast clinit barriers support
333 }
334 InterpreterRuntime::cds_resolve_invoke(bc, raw_index, cp, CHECK);
335 is_static = " *** static";
336 break;
337
338 case Bytecodes::_invokevirtual:
339 case Bytecodes::_invokespecial:
340 case Bytecodes::_invokeinterface:
341 InterpreterRuntime::cds_resolve_invoke(bc, raw_index, cp, CHECK);
342 break;
343
344 case Bytecodes::_invokehandle:
345 InterpreterRuntime::cds_resolve_invokehandle(raw_index, cp, CHECK);
346 break;
347
348 default:
349 ShouldNotReachHere();
350 }
351
352 if (log_is_enabled(Trace, aot, resolve)) {
353 ResourceMark rm(THREAD);
354 bool resolved = cp->is_resolved(raw_index, bc);
355 Symbol* name = cp->name_ref_at(raw_index, bc);
356 Symbol* signature = cp->signature_ref_at(raw_index, bc);
357 log_trace(aot, resolve)("%s %s [%3d] %s -> %s.%s:%s%s",
358 (resolved ? "Resolved" : "Failed to resolve"),
359 Bytecodes::name(bc), cp_index, ik->external_name(),
360 resolved_klass->external_name(),
361 name->as_C_string(), signature->as_C_string(), is_static);
362 }
363 }
364
365 void AOTConstantPoolResolver::preresolve_indy_cp_entries(JavaThread* current, InstanceKlass* ik, GrowableArray<bool>* preresolve_list) {
366 JavaThread* THREAD = current;
367 constantPoolHandle cp(THREAD, ik->constants());
368 if (!CDSConfig::is_dumping_invokedynamic() || cp->cache() == nullptr) {
369 return;
370 }
371
372 assert(preresolve_list != nullptr, "preresolve_indy_cp_entries() should not be called for "
373 "regenerated LambdaForm Invoker classes, which should not have indys anyway.");
374
375 Array<ResolvedIndyEntry>* indy_entries = cp->cache()->resolved_indy_entries();
376 for (int i = 0; i < indy_entries->length(); i++) {
377 ResolvedIndyEntry* rie = indy_entries->adr_at(i);
378 int cp_index = rie->constant_pool_index();
379 if (preresolve_list->at(cp_index) == true) {
380 if (!rie->is_resolved() && is_indy_resolution_deterministic(cp(), cp_index)) {
381 InterpreterRuntime::cds_resolve_invokedynamic(i, cp, THREAD);
382 if (HAS_PENDING_EXCEPTION) {
383 CLEAR_PENDING_EXCEPTION; // just ignore
384 }
385 }
386 if (log_is_enabled(Trace, aot, resolve)) {
387 ResourceMark rm(THREAD);
388 log_trace(aot, resolve)("%s indy [%3d] %s",
389 rie->is_resolved() ? "Resolved" : "Failed to resolve",
390 cp_index, ik->external_name());
391 }
392 }
393 }
394 }
395
396 // Check the MethodType signatures used by parameters to the indy BSMs. Make sure we don't
397 // use types that have been excluded, or else we might end up creating MethodTypes that cannot be stored
398 // in the AOT cache.
399 bool AOTConstantPoolResolver::check_methodtype_signature(ConstantPool* cp, Symbol* sig, Klass** return_type_ret) {
400 ResourceMark rm;
401 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
402 if (ss.is_reference()) {
403 Symbol* type = ss.as_symbol();
404 Klass* k = find_loaded_class(Thread::current(), cp->pool_holder()->class_loader(), type);
405 if (k == nullptr) {
406 return false;
407 }
408
409 if (SystemDictionaryShared::should_be_excluded(k)) {
410 if (log_is_enabled(Warning, aot, resolve)) {
411 ResourceMark rm;
412 log_warning(aot, resolve)("Cannot aot-resolve Lambda proxy because %s is excluded", k->external_name());
413 }
414 return false;
415 }
416
417 if (ss.at_return_type() && return_type_ret != nullptr) {
418 *return_type_ret = k;
419 }
420 }
421 }
422 return true;
423 }
424
425 bool AOTConstantPoolResolver::check_lambda_metafactory_signature(ConstantPool* cp, Symbol* sig) {
426 Klass* k;
427 if (!check_methodtype_signature(cp, sig, &k)) {
428 return false;
429 }
430
431 // <k> is the interface type implemented by the lambda proxy
432 if (!k->is_interface()) {
433 // cp->pool_holder() doesn't look like a valid class generated by javac
434 return false;
435 }
436
437
438 // The linked lambda callsite has an instance of the interface implemented by this lambda. If this
439 // interface requires its <clinit> to be executed, then we must delay the execution to the production run
440 // as <clinit> can have side effects ==> exclude such cases.
441 InstanceKlass* intf = InstanceKlass::cast(k);
442 bool exclude = intf->interface_needs_clinit_execution_as_super();
443 if (log_is_enabled(Debug, aot, resolve)) {
444 ResourceMark rm;
445 log_debug(aot, resolve)("%s aot-resolve Lambda proxy of interface type %s",
446 exclude ? "Cannot" : "Can", k->external_name());
447 }
448 return !exclude;
449 }
450
451 bool AOTConstantPoolResolver::check_lambda_metafactory_methodtype_arg(ConstantPool* cp, int bsms_attribute_index, int arg_i) {
452 int mt_index = cp->bsm_attribute_entry(bsms_attribute_index)->argument_index(arg_i);
453 if (!cp->tag_at(mt_index).is_method_type()) {
454 // malformed class?
455 return false;
456 }
457
458 Symbol* sig = cp->method_type_signature_at(mt_index);
459 if (log_is_enabled(Debug, aot, resolve)) {
460 ResourceMark rm;
461 log_debug(aot, resolve)("Checking MethodType for LambdaMetafactory BSM arg %d: %s", arg_i, sig->as_C_string());
462 }
463
464 return check_methodtype_signature(cp, sig);
465 }
466
467 bool AOTConstantPoolResolver::check_lambda_metafactory_methodhandle_arg(ConstantPool* cp, int bsms_attribute_index, int arg_i) {
468 int mh_index = cp->bsm_attribute_entry(bsms_attribute_index)->argument_index(arg_i);
469 if (!cp->tag_at(mh_index).is_method_handle()) {
470 // malformed class?
471 return false;
472 }
473
474 Symbol* sig = cp->method_handle_signature_ref_at(mh_index);
475 if (log_is_enabled(Debug, aot, resolve)) {
476 ResourceMark rm;
477 log_debug(aot, resolve)("Checking MethodType of MethodHandle for LambdaMetafactory BSM arg %d: %s", arg_i, sig->as_C_string());
478 }
479 return check_methodtype_signature(cp, sig);
480 }
481
482 bool AOTConstantPoolResolver::is_indy_resolution_deterministic(ConstantPool* cp, int cp_index) {
483 assert(cp->tag_at(cp_index).is_invoke_dynamic(), "sanity");
484 if (!CDSConfig::is_dumping_invokedynamic()) {
485 return false;
486 }
487
488 InstanceKlass* pool_holder = cp->pool_holder();
489 if (!SystemDictionaryShared::is_builtin(pool_holder)) {
490 return false;
491 }
492
493 int bsm = cp->bootstrap_method_ref_index_at(cp_index);
494 int bsm_ref = cp->method_handle_index_at(bsm);
495 Symbol* bsm_name = cp->uncached_name_ref_at(bsm_ref);
496 Symbol* bsm_signature = cp->uncached_signature_ref_at(bsm_ref);
497 Symbol* bsm_klass = cp->klass_name_at(cp->uncached_klass_ref_index_at(bsm_ref));
498
499 // We currently support only StringConcatFactory::makeConcatWithConstants() and LambdaMetafactory::metafactory()
500 // We should mark the allowed BSMs in the JDK code using a private annotation.
501 // See notes on RFE JDK-8342481.
502
503 if (bsm_klass->equals("java/lang/invoke/StringConcatFactory") &&
504 bsm_name->equals("makeConcatWithConstants") &&
505 bsm_signature->equals("(Ljava/lang/invoke/MethodHandles$Lookup;"
506 "Ljava/lang/String;"
507 "Ljava/lang/invoke/MethodType;"
508 "Ljava/lang/String;"
509 "[Ljava/lang/Object;"
510 ")Ljava/lang/invoke/CallSite;")) {
511 Symbol* factory_type_sig = cp->uncached_signature_ref_at(cp_index);
512 if (log_is_enabled(Debug, aot, resolve)) {
513 ResourceMark rm;
514 log_debug(aot, resolve)("Checking StringConcatFactory callsite signature [%d]: %s", cp_index, factory_type_sig->as_C_string());
515 }
516
517 Klass* k;
518 if (!check_methodtype_signature(cp, factory_type_sig, &k)) {
519 return false;
520 }
521 if (k != vmClasses::String_klass()) {
522 // bad class file?
523 return false;
524 }
525
526 return true;
527 }
528
529 if (bsm_klass->equals("java/lang/invoke/LambdaMetafactory") &&
530 bsm_name->equals("metafactory") &&
531 bsm_signature->equals("(Ljava/lang/invoke/MethodHandles$Lookup;"
532 "Ljava/lang/String;"
533 "Ljava/lang/invoke/MethodType;"
534 "Ljava/lang/invoke/MethodType;"
535 "Ljava/lang/invoke/MethodHandle;"
536 "Ljava/lang/invoke/MethodType;"
537 ")Ljava/lang/invoke/CallSite;")) {
538 /*
539 * An indy callsite is associated with the following MethodType and MethodHandles:
540 *
541 * https://github.com/openjdk/jdk/blob/580eb62dc097efeb51c76b095c1404106859b673/src/java.base/share/classes/java/lang/invoke/LambdaMetafactory.java#L293-L309
542 *
543 * MethodType factoryType The expected signature of the {@code CallSite}. The
544 * parameter types represent the types of capture variables;
545 * the return type is the interface to implement. When
546 * used with {@code invokedynamic}, this is provided by
547 * the {@code NameAndType} of the {@code InvokeDynamic}
548 *
549 * MethodType interfaceMethodType Signature and return type of method to be
550 * implemented by the function object.
551 *
552 * MethodHandle implementation A direct method handle describing the implementation
553 * method which should be called (with suitable adaptation
554 * of argument types and return types, and with captured
555 * arguments prepended to the invocation arguments) at
556 * invocation time.
557 *
558 * MethodType dynamicMethodType The signature and return type that should
559 * be enforced dynamically at invocation time.
560 * In simple use cases this is the same as
561 * {@code interfaceMethodType}.
562 */
563 Symbol* factory_type_sig = cp->uncached_signature_ref_at(cp_index);
564 if (log_is_enabled(Debug, aot, resolve)) {
565 ResourceMark rm;
566 log_debug(aot, resolve)("Checking lambda callsite signature [%d]: %s", cp_index, factory_type_sig->as_C_string());
567 }
568
569 if (!check_lambda_metafactory_signature(cp, factory_type_sig)) {
570 return false;
571 }
572
573 int bsms_attribute_index = cp->bootstrap_methods_attribute_index(cp_index);
574 int arg_count = cp->bsm_attribute_entry(bsms_attribute_index)->argument_count();
575 if (arg_count != 3) {
576 // Malformed class?
577 return false;
578 }
579
580 // interfaceMethodType
581 if (!check_lambda_metafactory_methodtype_arg(cp, bsms_attribute_index, 0)) {
582 return false;
583 }
584
585 // implementation
586 if (!check_lambda_metafactory_methodhandle_arg(cp, bsms_attribute_index, 1)) {
587 return false;
588 }
589
590 // dynamicMethodType
591 if (!check_lambda_metafactory_methodtype_arg(cp, bsms_attribute_index, 2)) {
592 return false;
593 }
594
595 return true;
596 }
597
598 return false;
599 }
600 #ifdef ASSERT
601 bool AOTConstantPoolResolver::is_in_archivebuilder_buffer(address p) {
602 if (!Thread::current()->is_VM_thread() || ArchiveBuilder::current() == nullptr) {
603 return false;
604 } else {
605 return ArchiveBuilder::current()->is_in_buffer_space(p);
606 }
607 }
608 #endif