1 /*
2 * Copyright (c) 1997, 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/archiveUtils.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/defaultMethods.hpp"
28 #include "classfile/javaClasses.hpp"
29 #include "classfile/systemDictionary.hpp"
30 #include "classfile/vmClasses.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "compiler/compilationPolicy.hpp"
33 #include "compiler/compileBroker.hpp"
34 #include "gc/shared/collectedHeap.inline.hpp"
35 #include "interpreter/bootstrapInfo.hpp"
36 #include "interpreter/bytecode.hpp"
37 #include "interpreter/interpreterRuntime.hpp"
38 #include "interpreter/linkResolver.hpp"
39 #include "jvm.h"
40 #include "logging/log.hpp"
41 #include "logging/logStream.hpp"
42 #include "memory/resourceArea.hpp"
43 #include "oops/constantPool.inline.hpp"
44 #include "oops/cpCache.inline.hpp"
45 #include "oops/instanceKlass.inline.hpp"
46 #include "oops/klass.inline.hpp"
47 #include "oops/method.inline.hpp"
48 #include "oops/objArrayKlass.hpp"
49 #include "oops/objArrayOop.hpp"
50 #include "oops/oop.inline.hpp"
51 #include "oops/resolvedIndyEntry.hpp"
52 #include "oops/symbolHandle.hpp"
53 #include "prims/jvmtiExport.hpp"
54 #include "prims/methodHandles.hpp"
55 #include "runtime/fieldDescriptor.inline.hpp"
56 #include "runtime/frame.inline.hpp"
57 #include "runtime/handles.inline.hpp"
58 #include "runtime/javaThread.inline.hpp"
59 #include "runtime/perfData.hpp"
60 #include "runtime/reflection.hpp"
61 #include "runtime/safepointVerifiers.hpp"
62 #include "runtime/sharedRuntime.hpp"
63 #include "runtime/signature.hpp"
64 #include "runtime/vmThread.hpp"
65 #include "utilities/macros.hpp"
66 #if INCLUDE_JFR
67 #include "jfr/jfr.hpp"
68 #endif
69
70 //------------------------------------------------------------------------------------------------------------------------
71 // Implementation of CallInfo
72
73
74 void CallInfo::set_static(Klass* resolved_klass, const methodHandle& resolved_method, TRAPS) {
75 int vtable_index = Method::nonvirtual_vtable_index;
76 set_common(resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK);
77 }
78
79
80 void CallInfo::set_interface(Klass* resolved_klass,
81 const methodHandle& resolved_method,
82 const methodHandle& selected_method,
83 int itable_index, TRAPS) {
84 // This is only called for interface methods. If the resolved_method
85 // comes from java/lang/Object, it can be the subject of a virtual call, so
86 // we should pick the vtable index from the resolved method.
87 // In that case, the caller must call set_virtual instead of set_interface.
88 assert(resolved_method->method_holder()->is_interface(), "");
89 assert(itable_index == resolved_method->itable_index(), "");
90 set_common(resolved_klass, resolved_method, selected_method, CallInfo::itable_call, itable_index, CHECK);
91 }
92
93 void CallInfo::set_virtual(Klass* resolved_klass,
94 const methodHandle& resolved_method,
95 const methodHandle& selected_method,
96 int vtable_index, TRAPS) {
97 assert(vtable_index >= 0 || vtable_index == Method::nonvirtual_vtable_index, "valid index");
98 assert(vtable_index < 0 || !resolved_method->has_vtable_index() || vtable_index == resolved_method->vtable_index(), "");
99 CallKind kind = (vtable_index >= 0 && !resolved_method->can_be_statically_bound() ? CallInfo::vtable_call : CallInfo::direct_call);
100 set_common(resolved_klass, resolved_method, selected_method, kind, vtable_index, CHECK);
101 assert(!resolved_method->is_compiled_lambda_form(), "these must be handled via an invokehandle call");
102 }
103
104 void CallInfo::set_handle(Klass* resolved_klass,
105 const methodHandle& resolved_method,
106 Handle resolved_appendix, TRAPS) {
107 guarantee(resolved_method.not_null(), "resolved method is null");
108 assert(resolved_method->intrinsic_id() == vmIntrinsics::_invokeBasic ||
109 resolved_method->is_compiled_lambda_form(),
110 "linkMethod must return one of these");
111 int vtable_index = Method::nonvirtual_vtable_index;
112 assert(!resolved_method->has_vtable_index(), "");
113 set_common(resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK);
114 _resolved_appendix = resolved_appendix;
115 }
116
117 // Redefinition safepoint may have updated the method. Make sure the new version of the method is returned.
118 // Callers are responsible for not safepointing and storing this method somewhere safe where redefinition
119 // can replace it if runs again. Safe places are constant pool cache and code cache metadata.
120 // The old method is safe in CallInfo since its a methodHandle (it won't get deleted), and accessed with these
121 // accessors.
122 Method* CallInfo::resolved_method() const {
123 if (JvmtiExport::can_hotswap_or_post_breakpoint() && _resolved_method->is_old()) {
124 return _resolved_method->get_new_method();
125 } else {
126 return _resolved_method();
127 }
128 }
129
130 Method* CallInfo::selected_method() const {
131 if (JvmtiExport::can_hotswap_or_post_breakpoint() && _selected_method->is_old()) {
132 return _selected_method->get_new_method();
133 } else {
134 return _selected_method();
135 }
136 }
137
138 void CallInfo::set_common(Klass* resolved_klass,
139 const methodHandle& resolved_method,
140 const methodHandle& selected_method,
141 CallKind kind,
142 int index,
143 TRAPS) {
144 if (selected_method.not_null()) {
145 assert(resolved_method->signature() == selected_method->signature(), "signatures must correspond");
146 }
147 _resolved_klass = resolved_klass;
148 _resolved_method = resolved_method;
149 _selected_method = selected_method;
150 _call_kind = kind;
151 _call_index = index;
152 _resolved_appendix = Handle();
153 DEBUG_ONLY(verify()); // verify before making side effects
154
155 if (selected_method.not_null()) {
156 CompilationPolicy::compile_if_required(selected_method, THREAD);
157 }
158 }
159
160 // utility query for unreflecting a method
161 CallInfo::CallInfo(Method* resolved_method, Klass* resolved_klass, TRAPS) {
162 Klass* resolved_method_holder = resolved_method->method_holder();
163 if (resolved_klass == nullptr) { // 2nd argument defaults to holder of 1st
164 resolved_klass = resolved_method_holder;
165 }
166 _resolved_klass = resolved_klass;
167 _resolved_method = methodHandle(THREAD, resolved_method);
168 _selected_method = methodHandle(THREAD, resolved_method);
169 // classify:
170 CallKind kind = CallInfo::unknown_kind;
171 int index = resolved_method->vtable_index();
172 if (resolved_method->can_be_statically_bound()) {
173 kind = CallInfo::direct_call;
174 } else if (!resolved_method_holder->is_interface()) {
175 // Could be an Object method inherited into an interface, but still a vtable call.
176 kind = CallInfo::vtable_call;
177 } else if (!resolved_klass->is_interface()) {
178 // A default or miranda method. Compute the vtable index.
179 index = LinkResolver::vtable_index_of_interface_method(resolved_klass, _resolved_method);
180 assert(index >= 0 , "we should have valid vtable index at this point");
181
182 kind = CallInfo::vtable_call;
183 } else if (resolved_method->has_vtable_index()) {
184 // Can occur if an interface redeclares a method of Object.
185
186 #ifdef ASSERT
187 // Ensure that this is really the case.
188 Klass* object_klass = vmClasses::Object_klass();
189 Method * object_resolved_method = object_klass->vtable().method_at(index);
190 assert(object_resolved_method->name() == resolved_method->name(),
191 "Object and interface method names should match at vtable index %d, %s != %s",
192 index, object_resolved_method->name()->as_C_string(), resolved_method->name()->as_C_string());
193 assert(object_resolved_method->signature() == resolved_method->signature(),
194 "Object and interface method signatures should match at vtable index %d, %s != %s",
195 index, object_resolved_method->signature()->as_C_string(), resolved_method->signature()->as_C_string());
196 #endif // ASSERT
197
198 kind = CallInfo::vtable_call;
199 } else {
200 // A regular interface call.
201 kind = CallInfo::itable_call;
202 index = resolved_method->itable_index();
203 }
204 assert(index == Method::nonvirtual_vtable_index || index >= 0, "bad index %d", index);
205 _call_kind = kind;
206 _call_index = index;
207 _resolved_appendix = Handle();
208 // Find or create a ResolvedMethod instance for this Method*
209 set_resolved_method_name(CHECK);
210
211 DEBUG_ONLY(verify());
212 }
213
214 void CallInfo::set_resolved_method_name(TRAPS) {
215 assert(_resolved_method() != nullptr, "Should already have a Method*");
216 oop rmethod_name = java_lang_invoke_ResolvedMethodName::find_resolved_method(_resolved_method, CHECK);
217 _resolved_method_name = Handle(THREAD, rmethod_name);
218 }
219
220 #ifdef ASSERT
221 void CallInfo::verify() {
222 switch (call_kind()) { // the meaning and allowed value of index depends on kind
223 case CallInfo::direct_call:
224 if (_call_index == Method::nonvirtual_vtable_index) break;
225 // else fall through to check vtable index:
226 case CallInfo::vtable_call:
227 assert(resolved_klass()->verify_vtable_index(_call_index), "");
228 break;
229 case CallInfo::itable_call:
230 assert(resolved_method()->method_holder()->verify_itable_index(_call_index), "");
231 break;
232 case CallInfo::unknown_kind:
233 assert(call_kind() != CallInfo::unknown_kind, "CallInfo must be set");
234 break;
235 default:
236 fatal("Unexpected call kind %d", call_kind());
237 }
238 }
239 #endif // ASSERT
240
241 #ifndef PRODUCT
242 void CallInfo::print() {
243 ResourceMark rm;
244 const char* kindstr;
245 switch (_call_kind) {
246 case direct_call: kindstr = "direct"; break;
247 case vtable_call: kindstr = "vtable"; break;
248 case itable_call: kindstr = "itable"; break;
249 default : kindstr = "unknown"; break;
250 }
251 tty->print_cr("Call %s@%d %s", kindstr, _call_index,
252 _resolved_method.is_null() ? "(none)" : _resolved_method->name_and_sig_as_C_string());
253 }
254 #endif
255
256 //------------------------------------------------------------------------------------------------------------------------
257 // Implementation of LinkInfo
258
259 LinkInfo::LinkInfo(const constantPoolHandle& pool, int index, const methodHandle& current_method, Bytecodes::Code code, TRAPS) {
260 // resolve klass
261 _resolved_klass = pool->klass_ref_at(index, code, CHECK);
262
263 // Get name, signature, and static klass
264 _name = pool->name_ref_at(index, code);
265 _signature = pool->signature_ref_at(index, code);
266 _tag = pool->tag_ref_at(index, code);
267 _current_klass = pool->pool_holder();
268 _current_method = current_method;
269
270 // Coming from the constant pool always checks access
271 _check_access = true;
272 _check_loader_constraints = true;
273 }
274
275 LinkInfo::LinkInfo(const constantPoolHandle& pool, int index, Bytecodes::Code code, TRAPS) {
276 // resolve klass
277 _resolved_klass = pool->klass_ref_at(index, code, CHECK);
278
279 // Get name, signature, and static klass
280 _name = pool->name_ref_at(index, code);
281 _signature = pool->signature_ref_at(index, code);
282 _tag = pool->tag_ref_at(index, code);
283 _current_klass = pool->pool_holder();
284 _current_method = methodHandle();
285
286 // Coming from the constant pool always checks access
287 _check_access = true;
288 _check_loader_constraints = true;
289 }
290
291 #ifndef PRODUCT
292 void LinkInfo::print() {
293 ResourceMark rm;
294 tty->print_cr("Link resolved_klass=%s name=%s signature=%s current_klass=%s check_access=%s check_loader_constraints=%s",
295 _resolved_klass->name()->as_C_string(),
296 _name->as_C_string(),
297 _signature->as_C_string(),
298 _current_klass == nullptr ? "(none)" : _current_klass->name()->as_C_string(),
299 _check_access ? "true" : "false",
300 _check_loader_constraints ? "true" : "false");
301
302 }
303 #endif // PRODUCT
304 //------------------------------------------------------------------------------------------------------------------------
305 // Klass resolution
306
307 void LinkResolver::check_klass_accessibility(Klass* ref_klass, Klass* sel_klass, TRAPS) {
308 Klass* base_klass = sel_klass;
309 if (sel_klass->is_objArray_klass()) {
310 base_klass = ObjArrayKlass::cast(sel_klass)->bottom_klass();
311 }
312 // The element type could be a typeArray - we only need the access
313 // check if it is a reference to another class.
314 if (!base_klass->is_instance_klass()) {
315 return; // no relevant check to do
316 }
317
318 Reflection::VerifyClassAccessResults vca_result =
319 Reflection::verify_class_access(ref_klass, InstanceKlass::cast(base_klass), true);
320 if (vca_result != Reflection::ACCESS_OK) {
321 ResourceMark rm(THREAD);
322 char* msg = Reflection::verify_class_access_msg(ref_klass,
323 InstanceKlass::cast(base_klass),
324 vca_result);
325
326 // Names are all known to be < 64k so we know this formatted message is not excessively large.
327
328 bool same_module = (base_klass->module() == ref_klass->module());
329 if (msg == nullptr) {
330 Exceptions::fthrow(
331 THREAD_AND_LOCATION,
332 vmSymbols::java_lang_IllegalAccessError(),
333 "failed to access class %s from class %s (%s%s%s)",
334 base_klass->external_name(),
335 ref_klass->external_name(),
336 (same_module) ? base_klass->joint_in_module_of_loader(ref_klass) : base_klass->class_in_module_of_loader(),
337 (same_module) ? "" : "; ",
338 (same_module) ? "" : ref_klass->class_in_module_of_loader());
339 } else {
340 // Use module specific message returned by verify_class_access_msg().
341 Exceptions::fthrow(
342 THREAD_AND_LOCATION,
343 vmSymbols::java_lang_IllegalAccessError(),
344 "%s", msg);
345 }
346 }
347 }
348
349 //------------------------------------------------------------------------------------------------------------------------
350 // Method resolution
351 //
352 // According to JVM spec. $5.4.3c & $5.4.3d
353
354 // Look up method in klasses, including static methods
355 // Then look up local default methods
356 Method* LinkResolver::lookup_method_in_klasses(const LinkInfo& link_info,
357 bool checkpolymorphism,
358 bool in_imethod_resolve) {
359 NoSafepointVerifier nsv; // Method* returned may not be reclaimed
360
361 Klass* klass = link_info.resolved_klass();
362 Symbol* name = link_info.name();
363 Symbol* signature = link_info.signature();
364
365 // Ignore overpasses so statics can be found during resolution
366 Method* result = klass->uncached_lookup_method(name, signature, Klass::OverpassLookupMode::skip);
367
368 if (klass->is_array_klass()) {
369 // Only consider klass and super klass for arrays
370 return result;
371 }
372
373 InstanceKlass* ik = InstanceKlass::cast(klass);
374
375 // JDK 8, JVMS 5.4.3.4: Interface method resolution should
376 // ignore static and non-public methods of java.lang.Object,
377 // like clone and finalize.
378 if (in_imethod_resolve &&
379 result != nullptr &&
380 ik->is_interface() &&
381 (result->is_static() || !result->is_public()) &&
382 result->method_holder() == vmClasses::Object_klass()) {
383 result = nullptr;
384 }
385
386 // Before considering default methods, check for an overpass in the
387 // current class if a method has not been found.
388 if (result == nullptr) {
389 result = ik->find_method(name, signature);
390 }
391
392 if (result == nullptr) {
393 Array<Method*>* default_methods = ik->default_methods();
394 if (default_methods != nullptr) {
395 result = InstanceKlass::find_method(default_methods, name, signature);
396 }
397 }
398
399 if (checkpolymorphism && result != nullptr) {
400 vmIntrinsics::ID iid = result->intrinsic_id();
401 if (MethodHandles::is_signature_polymorphic(iid)) {
402 // Do not link directly to these. The VM must produce a synthetic one using lookup_polymorphic_method.
403 return nullptr;
404 }
405 }
406 return result;
407 }
408
409 // returns first instance method
410 // Looks up method in classes, then looks up local default methods
411 Method* LinkResolver::lookup_instance_method_in_klasses(Klass* klass,
412 Symbol* name,
413 Symbol* signature,
414 Klass::PrivateLookupMode private_mode) {
415 Method* result = klass->uncached_lookup_method(name, signature, Klass::OverpassLookupMode::find, private_mode);
416
417 while (result != nullptr && result->is_static() && result->method_holder()->super() != nullptr) {
418 Klass* super_klass = result->method_holder()->super();
419 result = super_klass->uncached_lookup_method(name, signature, Klass::OverpassLookupMode::find, private_mode);
420 }
421
422 if (klass->is_array_klass()) {
423 // Only consider klass and super klass for arrays
424 return result;
425 }
426
427 if (result == nullptr) {
428 Array<Method*>* default_methods = InstanceKlass::cast(klass)->default_methods();
429 if (default_methods != nullptr) {
430 result = InstanceKlass::find_method(default_methods, name, signature);
431 assert(result == nullptr || !result->is_static(), "static defaults not allowed");
432 }
433 }
434 return result;
435 }
436
437 int LinkResolver::vtable_index_of_interface_method(Klass* klass, const methodHandle& resolved_method) {
438 InstanceKlass* ik = InstanceKlass::cast(klass);
439 return ik->vtable_index_of_interface_method(resolved_method());
440 }
441
442 Method* LinkResolver::lookup_method_in_interfaces(const LinkInfo& cp_info) {
443 InstanceKlass *ik = InstanceKlass::cast(cp_info.resolved_klass());
444
445 // Specify 'true' in order to skip default methods when searching the
446 // interfaces. Function lookup_method_in_klasses() already looked for
447 // the method in the default methods table.
448 return ik->lookup_method_in_all_interfaces(cp_info.name(), cp_info.signature(), Klass::DefaultsLookupMode::skip);
449 }
450
451 Method* LinkResolver::lookup_polymorphic_method(const LinkInfo& link_info,
452 Handle *appendix_result_or_null,
453 TRAPS) {
454 ResourceMark rm(THREAD);
455 Klass* klass = link_info.resolved_klass();
456 Symbol* name = link_info.name();
457 Symbol* full_signature = link_info.signature();
458 LogTarget(Info, methodhandles) lt_mh;
459
460 vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name);
461 log_info(methodhandles)("lookup_polymorphic_method iid=%s %s.%s%s",
462 vmIntrinsics::name_at(iid), klass->external_name(),
463 name->as_C_string(), full_signature->as_C_string());
464 if ((klass == vmClasses::MethodHandle_klass() ||
465 klass == vmClasses::VarHandle_klass()) &&
466 iid != vmIntrinsics::_none) {
467 if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) {
468 // Most of these do not need an up-call to Java to resolve, so can be done anywhere.
469 // Do not erase last argument type (MemberName) if it is a static linkTo method.
470 bool keep_last_arg = MethodHandles::is_signature_polymorphic_static(iid);
471 TempNewSymbol basic_signature =
472 MethodHandles::lookup_basic_type_signature(full_signature, keep_last_arg);
473 log_info(methodhandles)("lookup_polymorphic_method %s %s => basic %s",
474 name->as_C_string(),
475 full_signature->as_C_string(),
476 basic_signature->as_C_string());
477 Method* result = SystemDictionary::find_method_handle_intrinsic(iid,
478 basic_signature,
479 CHECK_NULL);
480 if (result != nullptr) {
481 assert(result->is_method_handle_intrinsic(), "MH.invokeBasic or MH.linkTo* intrinsic");
482 assert(result->intrinsic_id() != vmIntrinsics::_invokeGeneric, "wrong place to find this");
483 assert(basic_signature == result->signature(), "predict the result signature");
484 if (lt_mh.is_enabled()) {
485 LogStream ls(lt_mh);
486 ls.print("lookup_polymorphic_method => intrinsic ");
487 result->print_on(&ls);
488 }
489 }
490 return result;
491 } else if (iid == vmIntrinsics::_invokeGeneric
492 && THREAD->can_call_java()
493 && appendix_result_or_null != nullptr) {
494 // This is a method with type-checking semantics.
495 // We will ask Java code to spin an adapter method for it.
496 if (!MethodHandles::enabled()) {
497 // Make sure the Java part of the runtime has been booted up.
498 Klass* natives = vmClasses::MethodHandleNatives_klass();
499 if (natives == nullptr || InstanceKlass::cast(natives)->is_not_initialized()) {
500 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_invoke_MethodHandleNatives(),
501 Handle(),
502 true,
503 CHECK_NULL);
504 }
505 }
506
507 Handle appendix;
508 Method* result = SystemDictionary::find_method_handle_invoker(klass,
509 name,
510 full_signature,
511 link_info.current_klass(),
512 &appendix,
513 CHECK_NULL);
514 if (lt_mh.is_enabled()) {
515 LogStream ls(lt_mh);
516 ls.print("lookup_polymorphic_method => (via Java) ");
517 result->print_on(&ls);
518 ls.print(" lookup_polymorphic_method => appendix = ");
519 appendix.is_null() ? ls.print_cr("(none)") : appendix->print_on(&ls);
520 }
521 if (result != nullptr) {
522 #ifdef ASSERT
523 ResourceMark rm(THREAD);
524
525 TempNewSymbol basic_signature =
526 MethodHandles::lookup_basic_type_signature(full_signature);
527 int actual_size_of_params = result->size_of_parameters();
528 int expected_size_of_params = ArgumentSizeComputer(basic_signature).size();
529 // +1 for MethodHandle.this, +1 for trailing MethodType
530 if (!MethodHandles::is_signature_polymorphic_static(iid)) expected_size_of_params += 1;
531 if (appendix.not_null()) expected_size_of_params += 1;
532 if (actual_size_of_params != expected_size_of_params) {
533 tty->print_cr("*** basic_signature=%s", basic_signature->as_C_string());
534 tty->print_cr("*** result for %s: ", vmIntrinsics::name_at(iid));
535 result->print();
536 }
537 assert(actual_size_of_params == expected_size_of_params,
538 "%d != %d", actual_size_of_params, expected_size_of_params);
539 #endif //ASSERT
540
541 assert(appendix_result_or_null != nullptr, "");
542 (*appendix_result_or_null) = appendix;
543 }
544 return result;
545 }
546 }
547 return nullptr;
548 }
549
550 static void print_nest_host_error_on(stringStream* ss, Klass* ref_klass, Klass* sel_klass) {
551 assert(ref_klass->is_instance_klass(), "must be");
552 assert(sel_klass->is_instance_klass(), "must be");
553 InstanceKlass* ref_ik = InstanceKlass::cast(ref_klass);
554 InstanceKlass* sel_ik = InstanceKlass::cast(sel_klass);
555 const char* nest_host_error_1 = ref_ik->nest_host_error();
556 const char* nest_host_error_2 = sel_ik->nest_host_error();
557 if (nest_host_error_1 != nullptr || nest_host_error_2 != nullptr) {
558 ss->print(", (%s%s%s)",
559 (nest_host_error_1 != nullptr) ? nest_host_error_1 : "",
560 (nest_host_error_1 != nullptr && nest_host_error_2 != nullptr) ? ", " : "",
561 (nest_host_error_2 != nullptr) ? nest_host_error_2 : "");
562 }
563 }
564
565 void LinkResolver::check_method_accessability(Klass* ref_klass,
566 Klass* resolved_klass,
567 Klass* sel_klass,
568 const methodHandle& sel_method,
569 TRAPS) {
570
571 AccessFlags flags = sel_method->access_flags();
572
573 // Special case: arrays always override "clone". JVMS 2.15.
574 // If the resolved klass is an array class, and the declaring class
575 // is java.lang.Object and the method is "clone", set the flags
576 // to public.
577 //
578 // We'll check for the method name first, as that's most likely
579 // to be false (so we'll short-circuit out of these tests).
580 if (sel_method->name() == vmSymbols::clone_name() &&
581 sel_klass == vmClasses::Object_klass() &&
582 resolved_klass->is_array_klass()) {
583 // We need to change "protected" to "public".
584 assert(flags.is_protected(), "clone not protected?");
585 u2 new_flags = flags.as_method_flags();
586 new_flags = new_flags & (~JVM_ACC_PROTECTED);
587 new_flags = new_flags | JVM_ACC_PUBLIC;
588 flags.set_flags(new_flags);
589 }
590 // assert(extra_arg_result_or_null != nullptr, "must be able to return extra argument");
591
592 bool can_access = Reflection::verify_member_access(ref_klass,
593 resolved_klass,
594 sel_klass,
595 flags,
596 true, false, CHECK);
597 // Any existing exceptions that may have been thrown
598 // have been allowed to propagate.
599 if (!can_access) {
600 ResourceMark rm(THREAD);
601 stringStream ss;
602 bool same_module = (sel_klass->module() == ref_klass->module());
603 ss.print("class %s tried to access %s%s%smethod '%s' (%s%s%s)",
604 ref_klass->external_name(),
605 sel_method->is_abstract() ? "abstract " : "",
606 sel_method->is_protected() ? "protected " : "",
607 sel_method->is_private() ? "private " : "",
608 sel_method->external_name(),
609 (same_module) ? ref_klass->joint_in_module_of_loader(sel_klass) : ref_klass->class_in_module_of_loader(),
610 (same_module) ? "" : "; ",
611 (same_module) ? "" : sel_klass->class_in_module_of_loader()
612 );
613
614 // For private access see if there was a problem with nest host
615 // resolution, and if so report that as part of the message.
616 if (sel_method->is_private()) {
617 print_nest_host_error_on(&ss, ref_klass, sel_klass);
618 }
619
620 // Names are all known to be < 64k so we know this formatted message is not excessively large.
621 Exceptions::fthrow(THREAD_AND_LOCATION,
622 vmSymbols::java_lang_IllegalAccessError(),
623 "%s",
624 ss.as_string()
625 );
626 return;
627 }
628 }
629
630 void LinkResolver::resolve_continuation_enter(CallInfo& callinfo, TRAPS) {
631 Klass* resolved_klass = vmClasses::Continuation_klass();
632 Symbol* method_name = vmSymbols::enter_name();
633 Symbol* method_signature = vmSymbols::continuationEnter_signature();
634 Klass* current_klass = resolved_klass;
635 LinkInfo link_info(resolved_klass, method_name, method_signature, current_klass);
636 Method* resolved_method = resolve_method(link_info, Bytecodes::_invokestatic, CHECK);
637 callinfo.set_static(resolved_klass, methodHandle(THREAD, resolved_method), CHECK);
638 }
639
640 Method* LinkResolver::resolve_method_statically(Bytecodes::Code code,
641 const constantPoolHandle& pool, int index, TRAPS) {
642 // This method is used only
643 // (1) in C2 from InlineTree::ok_to_inline (via ciMethod::check_call),
644 // and
645 // (2) in Bytecode_invoke::static_target
646 // It appears to fail when applied to an invokeinterface call site.
647 // FIXME: Remove this method and ciMethod::check_call; refactor to use the other LinkResolver entry points.
648 // resolve klass
649 if (code == Bytecodes::_invokedynamic) {
650 Klass* resolved_klass = vmClasses::MethodHandle_klass();
651 Symbol* method_name = vmSymbols::invoke_name();
652 Symbol* method_signature = pool->signature_ref_at(index, code);
653 Klass* current_klass = pool->pool_holder();
654 LinkInfo link_info(resolved_klass, method_name, method_signature, current_klass);
655 return resolve_method(link_info, code, THREAD);
656 }
657
658 LinkInfo link_info(pool, index, methodHandle(), code, CHECK_NULL);
659 Klass* resolved_klass = link_info.resolved_klass();
660
661 if (pool->has_preresolution()
662 || ((resolved_klass == vmClasses::MethodHandle_klass() || resolved_klass == vmClasses::VarHandle_klass()) &&
663 MethodHandles::is_signature_polymorphic_name(resolved_klass, link_info.name()))) {
664 Method* result = ConstantPool::method_at_if_loaded(pool, index);
665 if (result != nullptr) {
666 return result;
667 }
668 }
669
670 if (code == Bytecodes::_invokeinterface) {
671 return resolve_interface_method(link_info, code, THREAD);
672 } else if (code == Bytecodes::_invokevirtual) {
673 return resolve_method(link_info, code, THREAD);
674 } else if (!resolved_klass->is_interface()) {
675 return resolve_method(link_info, code, THREAD);
676 } else {
677 return resolve_interface_method(link_info, code, THREAD);
678 }
679 }
680
681 // Check and print a loader constraint violation message for method or interface method
682 void LinkResolver::check_method_loader_constraints(const LinkInfo& link_info,
683 const methodHandle& resolved_method,
684 const char* method_type, TRAPS) {
685 Handle current_loader(THREAD, link_info.current_klass()->class_loader());
686 Handle resolved_loader(THREAD, resolved_method->method_holder()->class_loader());
687
688 ResourceMark rm(THREAD);
689 Symbol* failed_type_symbol =
690 SystemDictionary::check_signature_loaders(link_info.signature(),
691 /*klass_being_linked*/ nullptr, // We are not linking class
692 current_loader,
693 resolved_loader, true);
694 if (failed_type_symbol != nullptr) {
695 Klass* current_class = link_info.current_klass();
696 ClassLoaderData* current_loader_data = current_class->class_loader_data();
697 assert(current_loader_data != nullptr, "current class has no class loader data");
698 Klass* resolved_method_class = resolved_method->method_holder();
699 ClassLoaderData* target_loader_data = resolved_method_class->class_loader_data();
700 assert(target_loader_data != nullptr, "resolved method's class has no class loader data");
701
702 stringStream ss;
703 ss.print("loader constraint violation: when resolving %s '", method_type);
704 Method::print_external_name(&ss, link_info.resolved_klass(), link_info.name(), link_info.signature());
705 ss.print("' the class loader %s of the current class, %s,"
706 " and the class loader %s for the method's defining class, %s, have"
707 " different Class objects for the type %s used in the signature (%s; %s)",
708 current_loader_data->loader_name_and_id(),
709 current_class->name()->as_C_string(),
710 target_loader_data->loader_name_and_id(),
711 resolved_method_class->name()->as_C_string(),
712 failed_type_symbol->as_C_string(),
713 current_class->class_in_module_of_loader(false, true),
714 resolved_method_class->class_in_module_of_loader(false, true));
715 THROW_MSG(vmSymbols::java_lang_LinkageError(), ss.as_string());
716 }
717 }
718
719 void LinkResolver::check_field_loader_constraints(Symbol* field, Symbol* sig,
720 Klass* current_klass,
721 Klass* sel_klass, TRAPS) {
722 Handle ref_loader(THREAD, current_klass->class_loader());
723 Handle sel_loader(THREAD, sel_klass->class_loader());
724
725 ResourceMark rm(THREAD); // needed for check_signature_loaders
726 Symbol* failed_type_symbol =
727 SystemDictionary::check_signature_loaders(sig,
728 /*klass_being_linked*/ nullptr, // We are not linking class
729 ref_loader, sel_loader,
730 false);
731 if (failed_type_symbol != nullptr) {
732 stringStream ss;
733 const char* failed_type_name = failed_type_symbol->as_klass_external_name();
734
735 ss.print("loader constraint violation: when resolving field \"%s\" of type %s, "
736 "the class loader %s of the current class, %s, "
737 "and the class loader %s for the field's defining %s, %s, "
738 "have different Class objects for type %s (%s; %s)",
739 field->as_C_string(),
740 failed_type_name,
741 current_klass->class_loader_data()->loader_name_and_id(),
742 current_klass->external_name(),
743 sel_klass->class_loader_data()->loader_name_and_id(),
744 sel_klass->external_kind(),
745 sel_klass->external_name(),
746 failed_type_name,
747 current_klass->class_in_module_of_loader(false, true),
748 sel_klass->class_in_module_of_loader(false, true));
749 THROW_MSG(vmSymbols::java_lang_LinkageError(), ss.as_string());
750 }
751 }
752
753 Method* LinkResolver::resolve_method(const LinkInfo& link_info,
754 Bytecodes::Code code, TRAPS) {
755
756 Handle nested_exception;
757 Klass* resolved_klass = link_info.resolved_klass();
758
759 // 1. For invokevirtual, cannot call an interface method
760 if (code == Bytecodes::_invokevirtual && resolved_klass->is_interface()) {
761 ResourceMark rm(THREAD);
762 char buf[200];
763 jio_snprintf(buf, sizeof(buf), "Found interface %s, but class was expected",
764 resolved_klass->external_name());
765 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
766 }
767
768 // 2. check constant pool tag for called method - must be JVM_CONSTANT_Methodref
769 if (!link_info.tag().is_invalid() && !link_info.tag().is_method()) {
770 ResourceMark rm(THREAD);
771 stringStream ss;
772 ss.print("Method '");
773 Method::print_external_name(&ss, link_info.resolved_klass(), link_info.name(), link_info.signature());
774 ss.print("' must be Methodref constant");
775 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
776 }
777
778 // 3. lookup method in resolved klass and its super klasses
779 methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, true, false));
780
781 // 4. lookup method in all the interfaces implemented by the resolved klass
782 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) { // not found in the class hierarchy
783 resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info));
784
785 if (resolved_method.is_null()) {
786 // JSR 292: see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc
787 Method* method = lookup_polymorphic_method(link_info, (Handle*)nullptr, THREAD);
788 resolved_method = methodHandle(THREAD, method);
789 if (HAS_PENDING_EXCEPTION) {
790 nested_exception = Handle(THREAD, PENDING_EXCEPTION);
791 CLEAR_PENDING_EXCEPTION;
792 }
793 }
794 }
795
796 // 5. method lookup failed
797 if (resolved_method.is_null()) {
798 ResourceMark rm(THREAD);
799 stringStream ss;
800 ss.print("'");
801 Method::print_external_name(&ss, resolved_klass, link_info.name(), link_info.signature());
802 ss.print("'");
803 THROW_MSG_CAUSE_(vmSymbols::java_lang_NoSuchMethodError(),
804 ss.as_string(), nested_exception, nullptr);
805 }
806
807 // 6. access checks, access checking may be turned off when calling from within the VM.
808 Klass* current_klass = link_info.current_klass();
809 if (link_info.check_access()) {
810 assert(current_klass != nullptr , "current_klass should not be null");
811
812 // check if method can be accessed by the referring class
813 check_method_accessability(current_klass,
814 resolved_klass,
815 resolved_method->method_holder(),
816 resolved_method,
817 CHECK_NULL);
818 }
819 if (link_info.check_loader_constraints()) {
820 // check loader constraints
821 check_method_loader_constraints(link_info, resolved_method, "method", CHECK_NULL);
822 }
823
824 return resolved_method();
825 }
826
827 static void trace_method_resolution(const char* prefix,
828 Klass* klass,
829 Klass* resolved_klass,
830 Method* method,
831 bool logitables,
832 int index = -1) {
833 #ifndef PRODUCT
834 ResourceMark rm;
835 Log(itables) logi;
836 LogStream lsi(logi.trace());
837 Log(vtables) logv;
838 LogStream lsv(logv.trace());
839 outputStream* st;
840 if (logitables) {
841 st = &lsi;
842 } else {
843 st = &lsv;
844 }
845 st->print("%s%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ",
846 prefix,
847 (klass == nullptr ? "<null>" : klass->internal_name()),
848 resolved_klass->internal_name(),
849 Method::name_and_sig_as_C_string(resolved_klass,
850 method->name(),
851 method->signature()),
852 method->method_holder()->internal_name());
853 method->print_linkage_flags(st);
854 if (index != -1) {
855 st->print("vtable_index:%d", index);
856 }
857 st->cr();
858 #endif // PRODUCT
859 }
860
861 // Do linktime resolution of a method in the interface within the context of the specified bytecode.
862 Method* LinkResolver::resolve_interface_method(const LinkInfo& link_info, Bytecodes::Code code, TRAPS) {
863
864 Klass* resolved_klass = link_info.resolved_klass();
865
866 // check if klass is interface
867 if (!resolved_klass->is_interface()) {
868 ResourceMark rm(THREAD);
869 char buf[200];
870 jio_snprintf(buf, sizeof(buf), "Found class %s, but interface was expected", resolved_klass->external_name());
871 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
872 }
873
874 // check constant pool tag for called method - must be JVM_CONSTANT_InterfaceMethodref
875 if (!link_info.tag().is_invalid() && !link_info.tag().is_interface_method()) {
876 ResourceMark rm(THREAD);
877 stringStream ss;
878 ss.print("Method '");
879 Method::print_external_name(&ss, link_info.resolved_klass(), link_info.name(), link_info.signature());
880 ss.print("' must be InterfaceMethodref constant");
881 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
882 }
883
884 // lookup method in this interface or its super, java.lang.Object
885 // JDK8: also look for static methods
886 methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, false, true));
887
888 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) {
889 // lookup method in all the super-interfaces
890 resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info));
891 }
892
893 if (resolved_method.is_null()) {
894 // no method found
895 ResourceMark rm(THREAD);
896 stringStream ss;
897 ss.print("'");
898 Method::print_external_name(&ss, resolved_klass, link_info.name(), link_info.signature());
899 ss.print("'");
900 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), ss.as_string());
901 }
902
903 if (link_info.check_access()) {
904 // JDK8 adds non-public interface methods, and accessability check requirement
905 Klass* current_klass = link_info.current_klass();
906
907 assert(current_klass != nullptr , "current_klass should not be null");
908
909 // check if method can be accessed by the referring class
910 check_method_accessability(current_klass,
911 resolved_klass,
912 resolved_method->method_holder(),
913 resolved_method,
914 CHECK_NULL);
915 }
916 if (link_info.check_loader_constraints()) {
917 check_method_loader_constraints(link_info, resolved_method, "interface method", CHECK_NULL);
918 }
919
920 if (code != Bytecodes::_invokestatic && resolved_method->is_static()) {
921 ResourceMark rm(THREAD);
922 stringStream ss;
923 ss.print("Expected instance not static method '");
924 Method::print_external_name(&ss, resolved_klass,
925 resolved_method->name(), resolved_method->signature());
926 ss.print("'");
927 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
928 }
929
930 if (log_develop_is_enabled(Trace, itables)) {
931 char buf[200];
932 jio_snprintf(buf, sizeof(buf), "%s resolved interface method: caller-class:",
933 Bytecodes::name(code));
934 trace_method_resolution(buf, link_info.current_klass(), resolved_klass, resolved_method(), true);
935 }
936
937 return resolved_method();
938 }
939
940 //------------------------------------------------------------------------------------------------------------------------
941 // Field resolution
942
943 void LinkResolver::check_field_accessability(Klass* ref_klass,
944 Klass* resolved_klass,
945 Klass* sel_klass,
946 const fieldDescriptor& fd,
947 TRAPS) {
948 bool can_access = Reflection::verify_member_access(ref_klass,
949 resolved_klass,
950 sel_klass,
951 fd.access_flags(),
952 true, false, CHECK);
953 // Any existing exceptions that may have been thrown, for example LinkageErrors
954 // from nest-host resolution, have been allowed to propagate.
955 if (!can_access) {
956 bool same_module = (sel_klass->module() == ref_klass->module());
957 ResourceMark rm(THREAD);
958 stringStream ss;
959 ss.print("class %s tried to access %s%sfield %s.%s (%s%s%s)",
960 ref_klass->external_name(),
961 fd.is_protected() ? "protected " : "",
962 fd.is_private() ? "private " : "",
963 sel_klass->external_name(),
964 fd.name()->as_C_string(),
965 (same_module) ? ref_klass->joint_in_module_of_loader(sel_klass) : ref_klass->class_in_module_of_loader(),
966 (same_module) ? "" : "; ",
967 (same_module) ? "" : sel_klass->class_in_module_of_loader()
968 );
969 // For private access see if there was a problem with nest host
970 // resolution, and if so report that as part of the message.
971 if (fd.is_private()) {
972 print_nest_host_error_on(&ss, ref_klass, sel_klass);
973 }
974 // Names are all known to be < 64k so we know this formatted message is not excessively large.
975 Exceptions::fthrow(THREAD_AND_LOCATION,
976 vmSymbols::java_lang_IllegalAccessError(),
977 "%s",
978 ss.as_string()
979 );
980 return;
981 }
982 }
983
984 void LinkResolver::resolve_field_access(fieldDescriptor& fd,
985 const constantPoolHandle& pool,
986 int index,
987 const methodHandle& method,
988 Bytecodes::Code byte,
989 bool initialize_class, TRAPS) {
990 LinkInfo link_info(pool, index, method, byte, CHECK);
991 resolve_field(fd, link_info, byte, initialize_class, CHECK);
992 }
993
994 void LinkResolver::resolve_field(fieldDescriptor& fd,
995 const LinkInfo& link_info,
996 Bytecodes::Code byte, bool initialize_class,
997 TRAPS) {
998 assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic ||
999 byte == Bytecodes::_getfield || byte == Bytecodes::_putfield ||
1000 byte == Bytecodes::_nofast_getfield || byte == Bytecodes::_nofast_putfield ||
1001 (byte == Bytecodes::_nop && !link_info.check_access()), "bad field access bytecode");
1002
1003 bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic);
1004 bool is_put = (byte == Bytecodes::_putfield || byte == Bytecodes::_putstatic || byte == Bytecodes::_nofast_putfield);
1005 // Check if there's a resolved klass containing the field
1006 Klass* resolved_klass = link_info.resolved_klass();
1007 Symbol* field = link_info.name();
1008 Symbol* sig = link_info.signature();
1009
1010 // Resolve instance field
1011 Klass* sel_klass = resolved_klass->find_field(field, sig, &fd);
1012 // check if field exists; i.e., if a klass containing the field def has been selected
1013 if (sel_klass == nullptr) {
1014 ResourceMark rm(THREAD);
1015 stringStream ss;
1016 ss.print("Class %s does not have member field '", resolved_klass->external_name());
1017 sig->print_as_field_external_type(&ss);
1018 ss.print(" %s'", field->as_C_string());
1019 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), ss.as_string());
1020 }
1021
1022 // Access checking may be turned off when calling from within the VM.
1023 Klass* current_klass = link_info.current_klass();
1024 if (link_info.check_access()) {
1025
1026 // check access
1027 check_field_accessability(current_klass, resolved_klass, sel_klass, fd, CHECK);
1028
1029 // check for errors
1030 if (is_static != fd.is_static()) {
1031 ResourceMark rm(THREAD);
1032 char msg[200];
1033 jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string());
1034 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg);
1035 }
1036
1037 // A final field can be modified only
1038 // (1) by methods declared in the class declaring the field and
1039 // (2) by the <clinit> method (in case of a static field)
1040 // or by the <init> method (in case of an instance field).
1041 if (is_put && fd.access_flags().is_final()) {
1042
1043 if (sel_klass != current_klass) {
1044 ResourceMark rm(THREAD);
1045 stringStream ss;
1046 ss.print("Update to %s final field %s.%s attempted from a different class (%s) than the field's declaring class",
1047 is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(),
1048 current_klass->external_name());
1049 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
1050 }
1051
1052 if (fd.constants()->pool_holder()->major_version() >= 53) {
1053 Method* m = link_info.current_method();
1054 assert(m != nullptr, "information about the current method must be available for 'put' bytecodes");
1055 bool is_initialized_static_final_update = (byte == Bytecodes::_putstatic &&
1056 fd.is_static() &&
1057 !m->is_static_initializer());
1058 bool is_initialized_instance_final_update = ((byte == Bytecodes::_putfield || byte == Bytecodes::_nofast_putfield) &&
1059 !fd.is_static() &&
1060 !m->is_object_initializer());
1061
1062 if (is_initialized_static_final_update || is_initialized_instance_final_update) {
1063 ResourceMark rm(THREAD);
1064 stringStream ss;
1065 ss.print("Update to %s final field %s.%s attempted from a different method (%s) than the initializer method %s ",
1066 is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(),
1067 m->name()->as_C_string(),
1068 is_static ? "<clinit>" : "<init>");
1069 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
1070 }
1071 }
1072 }
1073
1074 // initialize resolved_klass if necessary
1075 // note 1: the klass which declared the field must be initialized (i.e, sel_klass)
1076 // according to the newest JVM spec (5.5, p.170) - was bug (gri 7/28/99)
1077 //
1078 // note 2: we don't want to force initialization if we are just checking
1079 // if the field access is legal; e.g., during compilation
1080 if (is_static && initialize_class) {
1081 sel_klass->initialize(CHECK);
1082 }
1083 }
1084
1085 if (link_info.check_loader_constraints() && (sel_klass != current_klass) && (current_klass != nullptr)) {
1086 check_field_loader_constraints(field, sig, current_klass, sel_klass, CHECK);
1087 }
1088
1089 // return information. note that the klass is set to the actual klass containing the
1090 // field, otherwise access of static fields in superclasses will not work.
1091 }
1092
1093
1094 //------------------------------------------------------------------------------------------------------------------------
1095 // Invoke resolution
1096 //
1097 // Naming conventions:
1098 //
1099 // resolved_method the specified method (i.e., static receiver specified via constant pool index)
1100 // sel_method the selected method (selected via run-time lookup; e.g., based on dynamic receiver class)
1101 // resolved_klass the specified klass (i.e., specified via constant pool index)
1102 // recv_klass the receiver klass
1103
1104
1105 void LinkResolver::resolve_static_call(CallInfo& result,
1106 const LinkInfo& link_info,
1107 bool initialize_class, TRAPS) {
1108 Method* resolved_method = linktime_resolve_static_method(link_info, CHECK);
1109
1110 // The resolved class can change as a result of this resolution.
1111 Klass* resolved_klass = resolved_method->method_holder();
1112
1113 // Initialize klass (this should only happen if everything is ok)
1114 if (initialize_class && resolved_klass->should_be_initialized()) {
1115 resolved_klass->initialize(CHECK);
1116 // Use updated LinkInfo to reresolve with resolved method holder
1117 LinkInfo new_info(resolved_klass, link_info.name(), link_info.signature(),
1118 link_info.current_klass(),
1119 link_info.check_access() ? LinkInfo::AccessCheck::required : LinkInfo::AccessCheck::skip,
1120 link_info.check_loader_constraints() ? LinkInfo::LoaderConstraintCheck::required : LinkInfo::LoaderConstraintCheck::skip);
1121 resolved_method = linktime_resolve_static_method(new_info, CHECK);
1122 }
1123
1124 // setup result
1125 result.set_static(resolved_klass, methodHandle(THREAD, resolved_method), CHECK);
1126 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1127 }
1128
1129 // throws linktime exceptions
1130 Method* LinkResolver::linktime_resolve_static_method(const LinkInfo& link_info, TRAPS) {
1131
1132 Klass* resolved_klass = link_info.resolved_klass();
1133 Method* resolved_method;
1134 if (!resolved_klass->is_interface()) {
1135 resolved_method = resolve_method(link_info, Bytecodes::_invokestatic, CHECK_NULL);
1136 } else {
1137 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokestatic, CHECK_NULL);
1138 }
1139 assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier");
1140
1141 // check if static
1142 if (!resolved_method->is_static()) {
1143 ResourceMark rm(THREAD);
1144 stringStream ss;
1145 ss.print("Expected static method '");
1146 resolved_method->print_external_name(&ss);
1147 ss.print("'");
1148 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1149 }
1150 return resolved_method;
1151 }
1152
1153
1154 void LinkResolver::resolve_special_call(CallInfo& result,
1155 Handle recv,
1156 const LinkInfo& link_info,
1157 TRAPS) {
1158 Method* resolved_method = linktime_resolve_special_method(link_info, CHECK);
1159 runtime_resolve_special_method(result, link_info, methodHandle(THREAD, resolved_method), recv, CHECK);
1160 }
1161
1162 void LinkResolver::cds_resolve_special_call(CallInfo& result, const LinkInfo& link_info, TRAPS) {
1163 resolve_special_call(result, Handle(), link_info, CHECK);
1164 }
1165
1166 // throws linktime exceptions
1167 Method* LinkResolver::linktime_resolve_special_method(const LinkInfo& link_info, TRAPS) {
1168
1169 // Invokespecial is called for multiple special reasons:
1170 // <init>
1171 // local private method invocation, for classes and interfaces
1172 // superclass.method, which can also resolve to a default method
1173 // and the selected method is recalculated relative to the direct superclass
1174 // superinterface.method, which explicitly does not check shadowing
1175 Klass* resolved_klass = link_info.resolved_klass();
1176 Method* resolved_method = nullptr;
1177
1178 if (!resolved_klass->is_interface()) {
1179 resolved_method = resolve_method(link_info, Bytecodes::_invokespecial, CHECK_NULL);
1180 } else {
1181 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokespecial, CHECK_NULL);
1182 }
1183
1184 // check if method name is <init>, that it is found in same klass as static type
1185 if (resolved_method->name() == vmSymbols::object_initializer_name() &&
1186 resolved_method->method_holder() != resolved_klass) {
1187 ResourceMark rm(THREAD);
1188 stringStream ss;
1189 ss.print("%s: method '", resolved_klass->external_name());
1190 resolved_method->signature()->print_as_signature_external_return_type(&ss);
1191 ss.print(" %s(", resolved_method->name()->as_C_string());
1192 resolved_method->signature()->print_as_signature_external_parameters(&ss);
1193 ss.print(")' not found");
1194 // Names are all known to be < 64k so we know this formatted message is not excessively large.
1195 Exceptions::fthrow(
1196 THREAD_AND_LOCATION,
1197 vmSymbols::java_lang_NoSuchMethodError(),
1198 "%s", ss.as_string());
1199 return nullptr;
1200 }
1201
1202 // ensure that invokespecial's interface method reference is in
1203 // a direct superinterface, not an indirect superinterface
1204 Klass* current_klass = link_info.current_klass();
1205 if (current_klass != nullptr && resolved_klass->is_interface()) {
1206 InstanceKlass* klass_to_check = InstanceKlass::cast(current_klass);
1207 if (!klass_to_check->is_same_or_direct_interface(resolved_klass)) {
1208 ResourceMark rm(THREAD);
1209 stringStream ss;
1210 ss.print("Interface method reference: '");
1211 resolved_method->print_external_name(&ss);
1212 ss.print("', is in an indirect superinterface of %s",
1213 current_klass->external_name());
1214 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1215 }
1216 }
1217
1218 // check if not static
1219 if (resolved_method->is_static()) {
1220 ResourceMark rm(THREAD);
1221 stringStream ss;
1222 ss.print("Expecting non-static method '");
1223 resolved_method->print_external_name(&ss);
1224 ss.print("'");
1225 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1226 }
1227
1228 if (log_develop_is_enabled(Trace, itables)) {
1229 trace_method_resolution("invokespecial resolved method: caller-class:",
1230 current_klass, resolved_klass, resolved_method, true);
1231 }
1232
1233 return resolved_method;
1234 }
1235
1236 // throws runtime exceptions
1237 void LinkResolver::runtime_resolve_special_method(CallInfo& result,
1238 const LinkInfo& link_info,
1239 const methodHandle& resolved_method,
1240 Handle recv, TRAPS) {
1241
1242 Klass* resolved_klass = link_info.resolved_klass();
1243
1244 // resolved method is selected method unless we have an old-style lookup
1245 // for a superclass method
1246 // Invokespecial for a superinterface, resolved method is selected method,
1247 // no checks for shadowing
1248 methodHandle sel_method(THREAD, resolved_method());
1249
1250 if (link_info.check_access() &&
1251 // check if the method is not <init>
1252 resolved_method->name() != vmSymbols::object_initializer_name()) {
1253
1254 Klass* current_klass = link_info.current_klass();
1255
1256 // Check if the class of the resolved_klass is a superclass
1257 // (not supertype in order to exclude interface classes) of the current class.
1258 // This check is not performed for super.invoke for interface methods
1259 // in super interfaces.
1260 if (current_klass->is_subclass_of(resolved_klass) &&
1261 current_klass != resolved_klass) {
1262 // Lookup super method
1263 Klass* super_klass = current_klass->super();
1264 Method* instance_method = lookup_instance_method_in_klasses(super_klass,
1265 resolved_method->name(),
1266 resolved_method->signature(),
1267 Klass::PrivateLookupMode::find);
1268 sel_method = methodHandle(THREAD, instance_method);
1269
1270 // check if found
1271 if (sel_method.is_null()) {
1272 ResourceMark rm(THREAD);
1273 stringStream ss;
1274 ss.print("'");
1275 resolved_method->print_external_name(&ss);
1276 ss.print("'");
1277 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1278 // check loader constraints if found a different method
1279 } else if (link_info.check_loader_constraints() && sel_method() != resolved_method()) {
1280 check_method_loader_constraints(link_info, sel_method, "method", CHECK);
1281 }
1282 }
1283
1284 // Check that the class of objectref (the receiver) is the current class or interface,
1285 // or a subtype of the current class or interface (the sender), otherwise invokespecial
1286 // throws IllegalAccessError.
1287 // The verifier checks that the sender is a subtype of the class in the I/MR operand.
1288 // The verifier also checks that the receiver is a subtype of the sender, if the sender is
1289 // a class. If the sender is an interface, the check has to be performed at runtime.
1290 InstanceKlass* sender = InstanceKlass::cast(current_klass);
1291 if (sender->is_interface() && recv.not_null()) {
1292 Klass* receiver_klass = recv->klass();
1293 if (!receiver_klass->is_subtype_of(sender)) {
1294 ResourceMark rm(THREAD);
1295 char buf[500];
1296 jio_snprintf(buf, sizeof(buf),
1297 "Receiver class %s must be the current class or a subtype of interface %s",
1298 receiver_klass->external_name(),
1299 sender->external_name());
1300 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), buf);
1301 }
1302 }
1303 }
1304
1305 // check if not static
1306 if (sel_method->is_static()) {
1307 ResourceMark rm(THREAD);
1308 stringStream ss;
1309 ss.print("Expecting non-static method '");
1310 resolved_method->print_external_name(&ss);
1311 ss.print("'");
1312 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1313 }
1314
1315 // check if abstract
1316 if (sel_method->is_abstract()) {
1317 ResourceMark rm(THREAD);
1318 stringStream ss;
1319 ss.print("'");
1320 Method::print_external_name(&ss, resolved_klass, sel_method->name(), sel_method->signature());
1321 ss.print("'");
1322 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1323 }
1324
1325 if (log_develop_is_enabled(Trace, itables)) {
1326 trace_method_resolution("invokespecial selected method: resolved-class:",
1327 resolved_klass, resolved_klass, sel_method(), true);
1328 }
1329
1330 // setup result
1331 result.set_static(resolved_klass, sel_method, CHECK);
1332 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1333 }
1334
1335 void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, Klass* receiver_klass,
1336 const LinkInfo& link_info,
1337 bool check_null_and_abstract, TRAPS) {
1338 Method* resolved_method = linktime_resolve_virtual_method(link_info, CHECK);
1339 runtime_resolve_virtual_method(result, methodHandle(THREAD, resolved_method),
1340 link_info.resolved_klass(),
1341 recv, receiver_klass,
1342 check_null_and_abstract,
1343 /*is_abstract_interpretation*/ false, CHECK);
1344 }
1345
1346 void LinkResolver::cds_resolve_virtual_call(CallInfo& result, const LinkInfo& link_info, TRAPS) {
1347 Method* resolved_method = linktime_resolve_virtual_method(link_info, CHECK);
1348 runtime_resolve_virtual_method(result, methodHandle(THREAD, resolved_method),
1349 link_info.resolved_klass(),
1350 Handle(), nullptr,
1351 /*check_null_and_abstract*/ false,
1352 /*is_abstract_interpretation*/ true, CHECK);
1353 }
1354
1355 // throws linktime exceptions
1356 Method* LinkResolver::linktime_resolve_virtual_method(const LinkInfo& link_info,
1357 TRAPS) {
1358 // normal method resolution
1359 Method* resolved_method = resolve_method(link_info, Bytecodes::_invokevirtual, CHECK_NULL);
1360
1361 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1362 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1363
1364 // check if private interface method
1365 Klass* resolved_klass = link_info.resolved_klass();
1366 Klass* current_klass = link_info.current_klass();
1367
1368 // This is impossible, if resolve_klass is an interface, we've thrown icce in resolve_method
1369 if (resolved_klass->is_interface() && resolved_method->is_private()) {
1370 ResourceMark rm(THREAD);
1371 stringStream ss;
1372 ss.print("private interface method requires invokespecial, not invokevirtual: method '");
1373 resolved_method->print_external_name(&ss);
1374 ss.print("', caller-class: %s",
1375 (current_klass == nullptr ? "<null>" : current_klass->internal_name()));
1376 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1377 }
1378
1379 // check if not static
1380 if (resolved_method->is_static()) {
1381 ResourceMark rm(THREAD);
1382 stringStream ss;
1383 ss.print("Expecting non-static method '");
1384 resolved_method->print_external_name(&ss);
1385 ss.print("'");
1386 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1387 }
1388
1389 if (log_develop_is_enabled(Trace, vtables)) {
1390 trace_method_resolution("invokevirtual resolved method: caller-class:",
1391 current_klass, resolved_klass, resolved_method, false);
1392 }
1393
1394 return resolved_method;
1395 }
1396
1397 // throws runtime exceptions
1398 void LinkResolver::runtime_resolve_virtual_method(CallInfo& result,
1399 const methodHandle& resolved_method,
1400 Klass* resolved_klass,
1401 Handle recv,
1402 Klass* recv_klass,
1403 bool check_null_and_abstract,
1404 bool is_abstract_interpretation,
1405 TRAPS) {
1406 // is_abstract_interpretation is true IFF CDS is resolving method references without
1407 // running any actual bytecode. Therefore, we don't have an actual recv/recv_klass, so
1408 // we cannot check the actual selected_method (which is not needed by CDS anyway).
1409
1410 // setup default return values
1411 int vtable_index = Method::invalid_vtable_index;
1412 methodHandle selected_method;
1413
1414 // runtime method resolution
1415 if (check_null_and_abstract && recv.is_null()) { // check if receiver exists
1416 THROW(vmSymbols::java_lang_NullPointerException());
1417 }
1418
1419 // Virtual methods cannot be resolved before its klass has been linked, for otherwise the Method*'s
1420 // has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since
1421 // a missing receiver might result in a bogus lookup.
1422 assert(resolved_method->method_holder()->is_linked(), "must be linked");
1423
1424 // do lookup based on receiver klass using the vtable index
1425 if (resolved_method->method_holder()->is_interface()) { // default or miranda method
1426 vtable_index = vtable_index_of_interface_method(resolved_klass, resolved_method);
1427 assert(vtable_index >= 0 , "we should have valid vtable index at this point");
1428
1429 if (!is_abstract_interpretation) {
1430 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1431 }
1432 } else {
1433 // at this point we are sure that resolved_method is virtual and not
1434 // a default or miranda method; therefore, it must have a valid vtable index.
1435 assert(!resolved_method->has_itable_index(), "");
1436 vtable_index = resolved_method->vtable_index();
1437 // We could get a negative vtable_index of nonvirtual_vtable_index for private
1438 // methods, or for final methods. Private methods never appear in the vtable
1439 // and never override other methods. As an optimization, final methods are
1440 // never put in the vtable, unless they override an existing method.
1441 // So if we do get nonvirtual_vtable_index, it means the selected method is the
1442 // resolved method, and it can never be changed by an override.
1443 if (vtable_index == Method::nonvirtual_vtable_index) {
1444 assert(resolved_method->can_be_statically_bound(), "cannot override this method");
1445 if (!is_abstract_interpretation) {
1446 selected_method = resolved_method;
1447 }
1448 } else {
1449 if (!is_abstract_interpretation) {
1450 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1451 }
1452 }
1453 }
1454
1455 if (!is_abstract_interpretation) {
1456 // check if method exists
1457 if (selected_method.is_null()) {
1458 throw_abstract_method_error(resolved_method, recv_klass, CHECK);
1459 }
1460
1461 // check if abstract
1462 if (check_null_and_abstract && selected_method->is_abstract()) {
1463 // Pass arguments for generating a verbose error message.
1464 throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK);
1465 }
1466
1467 if (log_develop_is_enabled(Trace, vtables)) {
1468 trace_method_resolution("invokevirtual selected method: receiver-class:",
1469 recv_klass, resolved_klass, selected_method(),
1470 false, vtable_index);
1471 }
1472 }
1473
1474 // setup result
1475 result.set_virtual(resolved_klass, resolved_method, selected_method, vtable_index, CHECK);
1476 if (selected_method.not_null()) {
1477 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1478 }
1479 }
1480
1481 void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, Klass* recv_klass,
1482 const LinkInfo& link_info,
1483 bool check_null_and_abstract, TRAPS) {
1484 // throws linktime exceptions
1485 Method* resolved_method = linktime_resolve_interface_method(link_info, CHECK);
1486 methodHandle mh(THREAD, resolved_method);
1487 runtime_resolve_interface_method(result, mh, link_info.resolved_klass(),
1488 recv, recv_klass, check_null_and_abstract,
1489 /*is_abstract_interpretation*/ false, CHECK);
1490 }
1491
1492 void LinkResolver::cds_resolve_interface_call(CallInfo& result, const LinkInfo& link_info, TRAPS) {
1493 Method* resolved_method = linktime_resolve_interface_method(link_info, CHECK);
1494 runtime_resolve_interface_method(result, methodHandle(THREAD, resolved_method), link_info.resolved_klass(),
1495 Handle(), nullptr,
1496 /*check_null_and_abstract*/ false,
1497 /*is_abstract_interpretation*/ true, CHECK);
1498 }
1499
1500 Method* LinkResolver::linktime_resolve_interface_method(const LinkInfo& link_info,
1501 TRAPS) {
1502 // normal interface method resolution
1503 Method* resolved_method = resolve_interface_method(link_info, Bytecodes::_invokeinterface, CHECK_NULL);
1504 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1505 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1506
1507 return resolved_method;
1508 }
1509
1510 // throws runtime exceptions
1511 void LinkResolver::runtime_resolve_interface_method(CallInfo& result,
1512 const methodHandle& resolved_method,
1513 Klass* resolved_klass,
1514 Handle recv,
1515 Klass* recv_klass,
1516 bool check_null_and_abstract,
1517 bool is_abstract_interpretation, TRAPS) {
1518 // is_abstract_interpretation -- see comments in runtime_resolve_virtual_method()
1519
1520 // check if receiver exists
1521 if (check_null_and_abstract && recv.is_null()) {
1522 THROW(vmSymbols::java_lang_NullPointerException());
1523 }
1524
1525 // check if receiver klass implements the resolved interface
1526 if (!is_abstract_interpretation && !recv_klass->is_subtype_of(resolved_klass)) {
1527 ResourceMark rm(THREAD);
1528 char buf[200];
1529 jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s",
1530 recv_klass->external_name(),
1531 resolved_klass->external_name());
1532 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1533 }
1534
1535 methodHandle selected_method;
1536
1537 if (!is_abstract_interpretation) {
1538 selected_method = resolved_method;
1539 }
1540
1541 // resolve the method in the receiver class, unless it is private
1542 if (!is_abstract_interpretation && !resolved_method->is_private()) {
1543 // do lookup based on receiver klass
1544 // This search must match the linktime preparation search for itable initialization
1545 // to correctly enforce loader constraints for interface method inheritance.
1546 // Private methods are skipped as the resolved method was not private.
1547 Method* method = lookup_instance_method_in_klasses(recv_klass,
1548 resolved_method->name(),
1549 resolved_method->signature(),
1550 Klass::PrivateLookupMode::skip);
1551 selected_method = methodHandle(THREAD, method);
1552
1553 if (selected_method.is_null() && !check_null_and_abstract) {
1554 // In theory this is a harmless placeholder value, but
1555 // in practice leaving in null affects the nsk default method tests.
1556 // This needs further study.
1557 selected_method = resolved_method;
1558 }
1559 // check if method exists
1560 if (selected_method.is_null()) {
1561 // Pass arguments for generating a verbose error message.
1562 throw_abstract_method_error(resolved_method, recv_klass, CHECK);
1563 }
1564 // check access
1565 // Throw Illegal Access Error if selected_method is not public.
1566 if (!selected_method->is_public()) {
1567 ResourceMark rm(THREAD);
1568 stringStream ss;
1569 ss.print("'");
1570 Method::print_external_name(&ss, recv_klass, selected_method->name(), selected_method->signature());
1571 ss.print("'");
1572 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
1573 }
1574 // check if abstract
1575 if (check_null_and_abstract && selected_method->is_abstract()) {
1576 throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK);
1577 }
1578 }
1579
1580 if (log_develop_is_enabled(Trace, itables)) {
1581 trace_method_resolution("invokeinterface selected method: receiver-class:",
1582 recv_klass, resolved_klass, selected_method(), true);
1583 }
1584 // setup result
1585 if (resolved_method->has_vtable_index()) {
1586 int vtable_index = resolved_method->vtable_index();
1587 log_develop_trace(itables)(" -- vtable index: %d", vtable_index);
1588 assert(is_abstract_interpretation || vtable_index == selected_method->vtable_index(), "sanity check");
1589 result.set_virtual(resolved_klass, resolved_method, selected_method, vtable_index, CHECK);
1590 } else if (resolved_method->has_itable_index()) {
1591 int itable_index = resolved_method->itable_index();
1592 log_develop_trace(itables)(" -- itable index: %d", itable_index);
1593 result.set_interface(resolved_klass, resolved_method, selected_method, itable_index, CHECK);
1594 } else {
1595 int index = resolved_method->vtable_index();
1596 log_develop_trace(itables)(" -- non itable/vtable index: %d", index);
1597 assert(index == Method::nonvirtual_vtable_index, "Oops hit another case!");
1598 assert(resolved_method->is_private() ||
1599 (resolved_method->is_final() && resolved_method->method_holder() == vmClasses::Object_klass()),
1600 "Should only have non-virtual invokeinterface for private or final-Object methods!");
1601 assert(resolved_method->can_be_statically_bound(), "Should only have non-virtual invokeinterface for statically bound methods!");
1602 // This sets up the nonvirtual form of "virtual" call (as needed for final and private methods)
1603 result.set_virtual(resolved_klass, resolved_method, resolved_method, index, CHECK);
1604 }
1605 if (!is_abstract_interpretation) {
1606 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1607 }
1608 }
1609
1610
1611 Method* LinkResolver::linktime_resolve_interface_method_or_null(
1612 const LinkInfo& link_info) {
1613 EXCEPTION_MARK;
1614 Method* method_result = linktime_resolve_interface_method(link_info, THREAD);
1615 if (HAS_PENDING_EXCEPTION) {
1616 CLEAR_PENDING_EXCEPTION;
1617 return nullptr;
1618 } else {
1619 return method_result;
1620 }
1621 }
1622
1623 Method* LinkResolver::linktime_resolve_virtual_method_or_null(
1624 const LinkInfo& link_info) {
1625 EXCEPTION_MARK;
1626 Method* method_result = linktime_resolve_virtual_method(link_info, THREAD);
1627 if (HAS_PENDING_EXCEPTION) {
1628 CLEAR_PENDING_EXCEPTION;
1629 return nullptr;
1630 } else {
1631 return method_result;
1632 }
1633 }
1634
1635 Method* LinkResolver::resolve_virtual_call_or_null(
1636 Klass* receiver_klass,
1637 const LinkInfo& link_info) {
1638 EXCEPTION_MARK;
1639 CallInfo info;
1640 resolve_virtual_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1641 if (HAS_PENDING_EXCEPTION) {
1642 CLEAR_PENDING_EXCEPTION;
1643 return nullptr;
1644 }
1645 return info.selected_method();
1646 }
1647
1648 Method* LinkResolver::resolve_interface_call_or_null(
1649 Klass* receiver_klass,
1650 const LinkInfo& link_info) {
1651 EXCEPTION_MARK;
1652 CallInfo info;
1653 resolve_interface_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1654 if (HAS_PENDING_EXCEPTION) {
1655 CLEAR_PENDING_EXCEPTION;
1656 return nullptr;
1657 }
1658 return info.selected_method();
1659 }
1660
1661 int LinkResolver::resolve_virtual_vtable_index(Klass* receiver_klass,
1662 const LinkInfo& link_info) {
1663 EXCEPTION_MARK;
1664 CallInfo info;
1665 resolve_virtual_call(info, Handle(), receiver_klass, link_info,
1666 /*check_null_or_abstract*/false, THREAD);
1667 if (HAS_PENDING_EXCEPTION) {
1668 CLEAR_PENDING_EXCEPTION;
1669 return Method::invalid_vtable_index;
1670 }
1671 return info.vtable_index();
1672 }
1673
1674 Method* LinkResolver::resolve_static_call_or_null(const LinkInfo& link_info) {
1675 EXCEPTION_MARK;
1676 CallInfo info;
1677 resolve_static_call(info, link_info, /*initialize_class*/false, THREAD);
1678 if (HAS_PENDING_EXCEPTION) {
1679 CLEAR_PENDING_EXCEPTION;
1680 return nullptr;
1681 }
1682 return info.selected_method();
1683 }
1684
1685 Method* LinkResolver::resolve_special_call_or_null(const LinkInfo& link_info) {
1686 EXCEPTION_MARK;
1687 CallInfo info;
1688 resolve_special_call(info, Handle(), link_info, THREAD);
1689 if (HAS_PENDING_EXCEPTION) {
1690 CLEAR_PENDING_EXCEPTION;
1691 return nullptr;
1692 }
1693 return info.selected_method();
1694 }
1695
1696
1697
1698 //------------------------------------------------------------------------------------------------------------------------
1699 // ConstantPool entries
1700
1701 void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) {
1702 switch (byte) {
1703 case Bytecodes::_invokestatic : resolve_invokestatic (result, pool, index, CHECK); break;
1704 case Bytecodes::_invokespecial : resolve_invokespecial (result, recv, pool, index, CHECK); break;
1705 case Bytecodes::_invokevirtual : resolve_invokevirtual (result, recv, pool, index, CHECK); break;
1706 case Bytecodes::_invokehandle : resolve_invokehandle (result, pool, index, CHECK); break;
1707 case Bytecodes::_invokedynamic : resolve_invokedynamic (result, pool, index, CHECK); break;
1708 case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break;
1709 default : break;
1710 }
1711 return;
1712 }
1713
1714 void LinkResolver::resolve_invoke(CallInfo& result, Handle& recv,
1715 const methodHandle& attached_method,
1716 Bytecodes::Code byte, TRAPS) {
1717 Klass* defc = attached_method->method_holder();
1718 Symbol* name = attached_method->name();
1719 Symbol* type = attached_method->signature();
1720 LinkInfo link_info(defc, name, type);
1721 switch(byte) {
1722 case Bytecodes::_invokevirtual:
1723 resolve_virtual_call(result, recv, recv->klass(), link_info,
1724 /*check_null_and_abstract=*/true, CHECK);
1725 break;
1726 case Bytecodes::_invokeinterface:
1727 resolve_interface_call(result, recv, recv->klass(), link_info,
1728 /*check_null_and_abstract=*/true, CHECK);
1729 break;
1730 case Bytecodes::_invokestatic:
1731 resolve_static_call(result, link_info, /*initialize_class=*/false, CHECK);
1732 break;
1733 case Bytecodes::_invokespecial:
1734 resolve_special_call(result, recv, link_info, CHECK);
1735 break;
1736 default:
1737 fatal("bad call: %s", Bytecodes::name(byte));
1738 break;
1739 }
1740 }
1741
1742 void LinkResolver::resolve_invokestatic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1743 LinkInfo link_info(pool, index, Bytecodes::_invokestatic, CHECK);
1744 resolve_static_call(result, link_info, /*initialize_class*/true, CHECK);
1745 }
1746
1747
1748 void LinkResolver::resolve_invokespecial(CallInfo& result, Handle recv,
1749 const constantPoolHandle& pool, int index, TRAPS) {
1750 LinkInfo link_info(pool, index, Bytecodes::_invokespecial, CHECK);
1751 resolve_special_call(result, recv, link_info, CHECK);
1752 }
1753
1754
1755 void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv,
1756 const constantPoolHandle& pool, int index,
1757 TRAPS) {
1758
1759 LinkInfo link_info(pool, index, Bytecodes::_invokevirtual, CHECK);
1760 Klass* recvrKlass = recv.is_null() ? (Klass*)nullptr : recv->klass();
1761 resolve_virtual_call(result, recv, recvrKlass, link_info, /*check_null_or_abstract*/true, CHECK);
1762 }
1763
1764
1765 void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, TRAPS) {
1766 LinkInfo link_info(pool, index, Bytecodes::_invokeinterface, CHECK);
1767 Klass* recvrKlass = recv.is_null() ? (Klass*)nullptr : recv->klass();
1768 resolve_interface_call(result, recv, recvrKlass, link_info, true, CHECK);
1769 }
1770
1771 bool LinkResolver::resolve_previously_linked_invokehandle(CallInfo& result, const LinkInfo& link_info, const constantPoolHandle& pool, int index, TRAPS) {
1772 ResolvedMethodEntry* method_entry = pool->cache()->resolved_method_entry_at(index);
1773 if (method_entry->method() != nullptr) {
1774 Klass* resolved_klass = link_info.resolved_klass();
1775 methodHandle method(THREAD, method_entry->method());
1776 Handle appendix(THREAD, pool->cache()->appendix_if_resolved(method_entry));
1777 result.set_handle(resolved_klass, method, appendix, CHECK_false);
1778 JFR_ONLY(Jfr::on_resolution(result, CHECK_false);)
1779 return true;
1780 } else {
1781 return false;
1782 }
1783 }
1784
1785 void LinkResolver::resolve_invokehandle(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1786
1787 PerfTraceTimedEvent timer(ClassLoader::perf_resolve_invokehandle_time(),
1788 ClassLoader::perf_resolve_invokehandle_count());
1789
1790 LinkInfo link_info(pool, index, Bytecodes::_invokehandle, CHECK);
1791 if (log_is_enabled(Info, methodhandles)) {
1792 ResourceMark rm(THREAD);
1793 log_info(methodhandles)("resolve_invokehandle %s %s", link_info.name()->as_C_string(),
1794 link_info.signature()->as_C_string());
1795 }
1796 { // Check if the call site has been bound already, and short circuit:
1797 bool is_done = resolve_previously_linked_invokehandle(result, link_info, pool, index, CHECK);
1798 if (is_done) return;
1799 }
1800 resolve_handle_call(result, link_info, CHECK);
1801 }
1802
1803 void LinkResolver::resolve_handle_call(CallInfo& result,
1804 const LinkInfo& link_info,
1805 TRAPS) {
1806 // JSR 292: this must be an implicitly generated method MethodHandle.invokeExact(*...) or similar
1807 Klass* resolved_klass = link_info.resolved_klass();
1808 assert(resolved_klass == vmClasses::MethodHandle_klass() ||
1809 resolved_klass == vmClasses::VarHandle_klass(), "");
1810 assert(MethodHandles::is_signature_polymorphic_name(link_info.name()), "");
1811 Handle resolved_appendix;
1812 Method* m = lookup_polymorphic_method(link_info, &resolved_appendix, CHECK);
1813 methodHandle resolved_method(THREAD, m);
1814
1815 if (link_info.check_access()) {
1816 Symbol* name = link_info.name();
1817 vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name);
1818 if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) {
1819 // Check if method can be accessed by the referring class.
1820 // MH.linkTo* invocations are not rewritten to invokehandle.
1821 assert(iid == vmIntrinsicID::_invokeBasic, "%s", vmIntrinsics::name_at(iid));
1822
1823 Klass* current_klass = link_info.current_klass();
1824 assert(current_klass != nullptr , "current_klass should not be null");
1825 check_method_accessability(current_klass,
1826 resolved_klass,
1827 resolved_method->method_holder(),
1828 resolved_method,
1829 CHECK);
1830 } else {
1831 // Java code is free to arbitrarily link signature-polymorphic invokers.
1832 assert(iid == vmIntrinsics::_invokeGeneric, "not an invoker: %s", vmIntrinsics::name_at(iid));
1833 assert(MethodHandles::is_signature_polymorphic_public_name(resolved_klass, name), "not public");
1834 }
1835 }
1836 result.set_handle(resolved_klass, resolved_method, resolved_appendix, CHECK);
1837 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1838 }
1839
1840 void LinkResolver::resolve_invokedynamic(CallInfo& result, const constantPoolHandle& pool, int indy_index, TRAPS) {
1841 PerfTraceTimedEvent timer(ClassLoader::perf_resolve_invokedynamic_time(),
1842 ClassLoader::perf_resolve_invokedynamic_count());
1843
1844 int pool_index = pool->resolved_indy_entry_at(indy_index)->constant_pool_index();
1845
1846 // Resolve the bootstrap specifier (BSM + optional arguments).
1847 BootstrapInfo bootstrap_specifier(pool, pool_index, indy_index);
1848
1849 // Check if CallSite has been bound already or failed already, and short circuit:
1850 {
1851 bool is_done = bootstrap_specifier.resolve_previously_linked_invokedynamic(result, CHECK);
1852 if (is_done) return;
1853 }
1854
1855 // The initial step in Call Site Specifier Resolution is to resolve the symbolic
1856 // reference to a method handle which will be the bootstrap method for a dynamic
1857 // call site. If resolution for the java.lang.invoke.MethodHandle for the bootstrap
1858 // method fails, then a MethodHandleInError is stored at the corresponding bootstrap
1859 // method's CP index for the CONSTANT_MethodHandle_info.
1860 // Any subsequent invokedynamic instruction which shares
1861 // this bootstrap method will encounter the resolution of MethodHandleInError.
1862
1863 resolve_dynamic_call(result, bootstrap_specifier, CHECK);
1864
1865 LogTarget(Debug, methodhandles, indy) lt_indy;
1866 if (lt_indy.is_enabled()) {
1867 LogStream ls(lt_indy);
1868 bootstrap_specifier.print_msg_on(&ls, "resolve_invokedynamic");
1869 }
1870
1871 // The returned linkage result is provisional up to the moment
1872 // the interpreter or runtime performs a serialized check of
1873 // the relevant ResolvedIndyEntry::method field. This is done by the caller
1874 // of this method, via CPC::set_dynamic_call, which uses
1875 // an ObjectLocker to do the final serialization of updates
1876 // to ResolvedIndyEntry state, including method.
1877
1878 // Log dynamic info to CDS classlist.
1879 ArchiveUtils::log_to_classlist(&bootstrap_specifier, CHECK);
1880 }
1881
1882 void LinkResolver::resolve_dynamic_call(CallInfo& result,
1883 BootstrapInfo& bootstrap_specifier,
1884 TRAPS) {
1885 // JSR 292: this must resolve to an implicitly generated method
1886 // such as MH.linkToCallSite(*...) or some other call-site shape.
1887 // The appendix argument is likely to be a freshly-created CallSite.
1888 // It may also be a MethodHandle from an unwrapped ConstantCallSite,
1889 // or any other reference. The resolved_method as well as the appendix
1890 // are both recorded together via CallInfo::set_handle.
1891 SystemDictionary::invoke_bootstrap_method(bootstrap_specifier, THREAD);
1892 Exceptions::wrap_dynamic_exception(/* is_indy */ true, THREAD);
1893
1894 if (HAS_PENDING_EXCEPTION) {
1895 if (!PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass())) {
1896 // Let any random low-level IE or SOE or OOME just bleed through.
1897 // Basically we pretend that the bootstrap method was never called,
1898 // if it fails this way: We neither record a successful linkage,
1899 // nor do we memorize a LE for posterity.
1900 return;
1901 }
1902 // JVMS 5.4.3 says: If an attempt by the Java Virtual Machine to resolve
1903 // a symbolic reference fails because an error is thrown that is an
1904 // instance of LinkageError (or a subclass), then subsequent attempts to
1905 // resolve the reference always fail with the same error that was thrown
1906 // as a result of the initial resolution attempt.
1907 bool recorded_res_status = bootstrap_specifier.save_and_throw_indy_exc(CHECK);
1908 if (!recorded_res_status) {
1909 // Another thread got here just before we did. So, either use the method
1910 // that it resolved or throw the LinkageError exception that it threw.
1911 bool is_done = bootstrap_specifier.resolve_previously_linked_invokedynamic(result, CHECK);
1912 if (is_done) return;
1913 }
1914 assert(bootstrap_specifier.pool()->resolved_indy_entry_at(bootstrap_specifier.indy_index())->resolution_failed(),
1915 "Resolution should have failed");
1916 }
1917
1918 bootstrap_specifier.resolve_newly_linked_invokedynamic(result, CHECK);
1919 // Exceptions::wrap_dynamic_exception not used because
1920 // set_handle doesn't throw linkage errors
1921 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1922 }
1923
1924 // Selected method is abstract.
1925 void LinkResolver::throw_abstract_method_error(const methodHandle& resolved_method,
1926 const methodHandle& selected_method,
1927 Klass *recv_klass, TRAPS) {
1928 Klass *resolved_klass = resolved_method->method_holder();
1929 ResourceMark rm(THREAD);
1930 stringStream ss;
1931
1932 if (recv_klass != nullptr) {
1933 ss.print("Receiver class %s does not define or inherit an "
1934 "implementation of the",
1935 recv_klass->external_name());
1936 } else {
1937 ss.print("Missing implementation of");
1938 }
1939
1940 assert(resolved_method.not_null(), "Sanity");
1941 ss.print(" resolved method '%s%s",
1942 resolved_method->is_abstract() ? "abstract " : "",
1943 resolved_method->is_private() ? "private " : "");
1944 resolved_method->signature()->print_as_signature_external_return_type(&ss);
1945 ss.print(" %s(", resolved_method->name()->as_C_string());
1946 resolved_method->signature()->print_as_signature_external_parameters(&ss);
1947 ss.print(")' of %s %s.",
1948 resolved_klass->external_kind(),
1949 resolved_klass->external_name());
1950
1951 if (selected_method.not_null() && !(resolved_method == selected_method)) {
1952 ss.print(" Selected method is '%s%s",
1953 selected_method->is_abstract() ? "abstract " : "",
1954 selected_method->is_private() ? "private " : "");
1955 selected_method->print_external_name(&ss);
1956 ss.print("'.");
1957 }
1958
1959 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1960 }