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 "precompiled.hpp"
26 #include "cds/archiveUtils.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/defaultMethods.hpp"
29 #include "classfile/javaClasses.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmClasses.hpp"
32 #include "classfile/vmSymbols.hpp"
33 #include "compiler/compilationPolicy.hpp"
34 #include "compiler/compileBroker.hpp"
35 #include "gc/shared/collectedHeap.inline.hpp"
36 #include "interpreter/bootstrapInfo.hpp"
37 #include "interpreter/bytecode.hpp"
38 #include "interpreter/interpreterRuntime.hpp"
39 #include "interpreter/linkResolver.hpp"
40 #include "jvm.h"
41 #include "logging/log.hpp"
42 #include "logging/logStream.hpp"
43 #include "memory/resourceArea.hpp"
44 #include "oops/constantPool.inline.hpp"
45 #include "oops/cpCache.inline.hpp"
46 #include "oops/instanceKlass.inline.hpp"
47 #include "oops/klass.inline.hpp"
48 #include "oops/method.inline.hpp"
49 #include "oops/objArrayKlass.hpp"
50 #include "oops/objArrayOop.hpp"
51 #include "oops/oop.inline.hpp"
52 #include "oops/resolvedIndyEntry.hpp"
53 #include "oops/symbolHandle.hpp"
54 #include "prims/jvmtiExport.hpp"
55 #include "prims/methodHandles.hpp"
56 #include "runtime/fieldDescriptor.inline.hpp"
57 #include "runtime/frame.inline.hpp"
58 #include "runtime/handles.inline.hpp"
59 #include "runtime/javaThread.inline.hpp"
60 #include "runtime/perfData.hpp"
61 #include "runtime/reflection.hpp"
62 #include "runtime/safepointVerifiers.hpp"
63 #include "runtime/sharedRuntime.hpp"
64 #include "runtime/signature.hpp"
65 #include "runtime/vmThread.hpp"
66 #include "utilities/macros.hpp"
67 #if INCLUDE_JFR
68 #include "jfr/jfr.hpp"
69 #endif
70
71 //------------------------------------------------------------------------------------------------------------------------
72 // Implementation of CallInfo
73
74
75 void CallInfo::set_static(Klass* resolved_klass, const methodHandle& resolved_method, TRAPS) {
76 int vtable_index = Method::nonvirtual_vtable_index;
77 set_common(resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK);
78 }
79
80
81 void CallInfo::set_interface(Klass* resolved_klass,
82 const methodHandle& resolved_method,
83 const methodHandle& selected_method,
84 int itable_index, TRAPS) {
85 // This is only called for interface methods. If the resolved_method
86 // comes from java/lang/Object, it can be the subject of a virtual call, so
87 // we should pick the vtable index from the resolved method.
88 // In that case, the caller must call set_virtual instead of set_interface.
89 assert(resolved_method->method_holder()->is_interface(), "");
90 assert(itable_index == resolved_method->itable_index(), "");
91 set_common(resolved_klass, resolved_method, selected_method, CallInfo::itable_call, itable_index, CHECK);
92 }
93
94 void CallInfo::set_virtual(Klass* resolved_klass,
95 const methodHandle& resolved_method,
96 const methodHandle& selected_method,
97 int vtable_index, TRAPS) {
98 assert(vtable_index >= 0 || vtable_index == Method::nonvirtual_vtable_index, "valid index");
99 assert(vtable_index < 0 || !resolved_method->has_vtable_index() || vtable_index == resolved_method->vtable_index(), "");
100 CallKind kind = (vtable_index >= 0 && !resolved_method->can_be_statically_bound() ? CallInfo::vtable_call : CallInfo::direct_call);
101 set_common(resolved_klass, resolved_method, selected_method, kind, vtable_index, CHECK);
102 assert(!resolved_method->is_compiled_lambda_form(), "these must be handled via an invokehandle call");
103 }
104
105 void CallInfo::set_handle(Klass* resolved_klass,
106 const methodHandle& resolved_method,
107 Handle resolved_appendix, TRAPS) {
108 guarantee(resolved_method.not_null(), "resolved method is null");
109 assert(resolved_method->intrinsic_id() == vmIntrinsics::_invokeBasic ||
110 resolved_method->is_compiled_lambda_form(),
111 "linkMethod must return one of these");
112 int vtable_index = Method::nonvirtual_vtable_index;
113 assert(!resolved_method->has_vtable_index(), "");
114 set_common(resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK);
115 _resolved_appendix = resolved_appendix;
116 }
117
118 // Redefinition safepoint may have updated the method. Make sure the new version of the method is returned.
119 // Callers are responsible for not safepointing and storing this method somewhere safe where redefinition
120 // can replace it if runs again. Safe places are constant pool cache and code cache metadata.
121 // The old method is safe in CallInfo since its a methodHandle (it won't get deleted), and accessed with these
122 // accessors.
123 Method* CallInfo::resolved_method() const {
124 if (JvmtiExport::can_hotswap_or_post_breakpoint() && _resolved_method->is_old()) {
125 return _resolved_method->get_new_method();
126 } else {
127 return _resolved_method();
128 }
129 }
130
131 Method* CallInfo::selected_method() const {
132 if (JvmtiExport::can_hotswap_or_post_breakpoint() && _selected_method->is_old()) {
133 return _selected_method->get_new_method();
134 } else {
135 return _selected_method();
136 }
137 }
138
139 void CallInfo::set_common(Klass* resolved_klass,
140 const methodHandle& resolved_method,
141 const methodHandle& selected_method,
142 CallKind kind,
143 int index,
144 TRAPS) {
145 if (selected_method.not_null()) {
146 assert(resolved_method->signature() == selected_method->signature(), "signatures must correspond");
147 }
148 _resolved_klass = resolved_klass;
149 _resolved_method = resolved_method;
150 _selected_method = selected_method;
151 _call_kind = kind;
152 _call_index = index;
153 _resolved_appendix = Handle();
154 DEBUG_ONLY(verify()); // verify before making side effects
155
156 if (selected_method.not_null()) {
157 CompilationPolicy::compile_if_required(selected_method, THREAD);
158 }
159 }
160
161 // utility query for unreflecting a method
162 CallInfo::CallInfo(Method* resolved_method, Klass* resolved_klass, TRAPS) {
163 Klass* resolved_method_holder = resolved_method->method_holder();
164 if (resolved_klass == nullptr) { // 2nd argument defaults to holder of 1st
165 resolved_klass = resolved_method_holder;
166 }
167 _resolved_klass = resolved_klass;
168 _resolved_method = methodHandle(THREAD, resolved_method);
169 _selected_method = methodHandle(THREAD, resolved_method);
170 // classify:
171 CallKind kind = CallInfo::unknown_kind;
172 int index = resolved_method->vtable_index();
173 if (resolved_method->can_be_statically_bound()) {
174 kind = CallInfo::direct_call;
175 } else if (!resolved_method_holder->is_interface()) {
176 // Could be an Object method inherited into an interface, but still a vtable call.
177 kind = CallInfo::vtable_call;
178 } else if (!resolved_klass->is_interface()) {
179 // A default or miranda method. Compute the vtable index.
180 index = LinkResolver::vtable_index_of_interface_method(resolved_klass, _resolved_method);
181 assert(index >= 0 , "we should have valid vtable index at this point");
182
183 kind = CallInfo::vtable_call;
184 } else if (resolved_method->has_vtable_index()) {
185 // Can occur if an interface redeclares a method of Object.
186
187 #ifdef ASSERT
188 // Ensure that this is really the case.
189 Klass* object_klass = vmClasses::Object_klass();
190 Method * object_resolved_method = object_klass->vtable().method_at(index);
191 assert(object_resolved_method->name() == resolved_method->name(),
192 "Object and interface method names should match at vtable index %d, %s != %s",
193 index, object_resolved_method->name()->as_C_string(), resolved_method->name()->as_C_string());
194 assert(object_resolved_method->signature() == resolved_method->signature(),
195 "Object and interface method signatures should match at vtable index %d, %s != %s",
196 index, object_resolved_method->signature()->as_C_string(), resolved_method->signature()->as_C_string());
197 #endif // ASSERT
198
199 kind = CallInfo::vtable_call;
200 } else {
201 // A regular interface call.
202 kind = CallInfo::itable_call;
203 index = resolved_method->itable_index();
204 }
205 assert(index == Method::nonvirtual_vtable_index || index >= 0, "bad index %d", index);
206 _call_kind = kind;
207 _call_index = index;
208 _resolved_appendix = Handle();
209 // Find or create a ResolvedMethod instance for this Method*
210 set_resolved_method_name(CHECK);
211
212 DEBUG_ONLY(verify());
213 }
214
215 void CallInfo::set_resolved_method_name(TRAPS) {
216 assert(_resolved_method() != nullptr, "Should already have a Method*");
217 oop rmethod_name = java_lang_invoke_ResolvedMethodName::find_resolved_method(_resolved_method, CHECK);
218 _resolved_method_name = Handle(THREAD, rmethod_name);
219 }
220
221 #ifdef ASSERT
222 void CallInfo::verify() {
223 switch (call_kind()) { // the meaning and allowed value of index depends on kind
224 case CallInfo::direct_call:
225 if (_call_index == Method::nonvirtual_vtable_index) break;
226 // else fall through to check vtable index:
227 case CallInfo::vtable_call:
228 assert(resolved_klass()->verify_vtable_index(_call_index), "");
229 break;
230 case CallInfo::itable_call:
231 assert(resolved_method()->method_holder()->verify_itable_index(_call_index), "");
232 break;
233 case CallInfo::unknown_kind:
234 assert(call_kind() != CallInfo::unknown_kind, "CallInfo must be set");
235 break;
236 default:
237 fatal("Unexpected call kind %d", call_kind());
238 }
239 }
240 #endif // ASSERT
241
242 #ifndef PRODUCT
243 void CallInfo::print() {
244 ResourceMark rm;
245 const char* kindstr;
246 switch (_call_kind) {
247 case direct_call: kindstr = "direct"; break;
248 case vtable_call: kindstr = "vtable"; break;
249 case itable_call: kindstr = "itable"; break;
250 default : kindstr = "unknown"; break;
251 }
252 tty->print_cr("Call %s@%d %s", kindstr, _call_index,
253 _resolved_method.is_null() ? "(none)" : _resolved_method->name_and_sig_as_C_string());
254 }
255 #endif
256
257 //------------------------------------------------------------------------------------------------------------------------
258 // Implementation of LinkInfo
259
260 LinkInfo::LinkInfo(const constantPoolHandle& pool, int index, const methodHandle& current_method, Bytecodes::Code code, TRAPS) {
261 // resolve klass
262 _resolved_klass = pool->klass_ref_at(index, code, CHECK);
263
264 // Get name, signature, and static klass
265 _name = pool->name_ref_at(index, code);
266 _signature = pool->signature_ref_at(index, code);
267 _tag = pool->tag_ref_at(index, code);
268 _current_klass = pool->pool_holder();
269 _current_method = current_method;
270
271 // Coming from the constant pool always checks access
272 _check_access = true;
273 _check_loader_constraints = true;
274 }
275
276 LinkInfo::LinkInfo(const constantPoolHandle& pool, int index, Bytecodes::Code code, TRAPS) {
277 // resolve klass
278 _resolved_klass = pool->klass_ref_at(index, code, CHECK);
279
280 // Get name, signature, and static klass
281 _name = pool->name_ref_at(index, code);
282 _signature = pool->signature_ref_at(index, code);
283 _tag = pool->tag_ref_at(index, code);
284 _current_klass = pool->pool_holder();
285 _current_method = methodHandle();
286
287 // Coming from the constant pool always checks access
288 _check_access = true;
289 _check_loader_constraints = true;
290 }
291
292 #ifndef PRODUCT
293 void LinkInfo::print() {
294 ResourceMark rm;
295 tty->print_cr("Link resolved_klass=%s name=%s signature=%s current_klass=%s check_access=%s check_loader_constraints=%s",
296 _resolved_klass->name()->as_C_string(),
297 _name->as_C_string(),
298 _signature->as_C_string(),
299 _current_klass == nullptr ? "(none)" : _current_klass->name()->as_C_string(),
300 _check_access ? "true" : "false",
301 _check_loader_constraints ? "true" : "false");
302
303 }
304 #endif // PRODUCT
305 //------------------------------------------------------------------------------------------------------------------------
306 // Klass resolution
307
308 void LinkResolver::check_klass_accessibility(Klass* ref_klass, Klass* sel_klass, TRAPS) {
309 Klass* base_klass = sel_klass;
310 if (sel_klass->is_objArray_klass()) {
311 base_klass = ObjArrayKlass::cast(sel_klass)->bottom_klass();
312 }
313 // The element type could be a typeArray - we only need the access
314 // check if it is a reference to another class.
315 if (!base_klass->is_instance_klass()) {
316 return; // no relevant check to do
317 }
318
319 Reflection::VerifyClassAccessResults vca_result =
320 Reflection::verify_class_access(ref_klass, InstanceKlass::cast(base_klass), true);
321 if (vca_result != Reflection::ACCESS_OK) {
322 ResourceMark rm(THREAD);
323 char* msg = Reflection::verify_class_access_msg(ref_klass,
324 InstanceKlass::cast(base_klass),
325 vca_result);
326
327 // Names are all known to be < 64k so we know this formatted message is not excessively large.
328
329 bool same_module = (base_klass->module() == ref_klass->module());
330 if (msg == nullptr) {
331 Exceptions::fthrow(
332 THREAD_AND_LOCATION,
333 vmSymbols::java_lang_IllegalAccessError(),
334 "failed to access class %s from class %s (%s%s%s)",
335 base_klass->external_name(),
336 ref_klass->external_name(),
337 (same_module) ? base_klass->joint_in_module_of_loader(ref_klass) : base_klass->class_in_module_of_loader(),
338 (same_module) ? "" : "; ",
339 (same_module) ? "" : ref_klass->class_in_module_of_loader());
340 } else {
341 // Use module specific message returned by verify_class_access_msg().
342 Exceptions::fthrow(
343 THREAD_AND_LOCATION,
344 vmSymbols::java_lang_IllegalAccessError(),
345 "%s", msg);
346 }
347 }
348 }
349
350 //------------------------------------------------------------------------------------------------------------------------
351 // Method resolution
352 //
353 // According to JVM spec. $5.4.3c & $5.4.3d
354
355 // Look up method in klasses, including static methods
356 // Then look up local default methods
357 Method* LinkResolver::lookup_method_in_klasses(const LinkInfo& link_info,
358 bool checkpolymorphism,
359 bool in_imethod_resolve) {
360 NoSafepointVerifier nsv; // Method* returned may not be reclaimed
361
362 Klass* klass = link_info.resolved_klass();
363 Symbol* name = link_info.name();
364 Symbol* signature = link_info.signature();
365
366 // Ignore overpasses so statics can be found during resolution
367 Method* result = klass->uncached_lookup_method(name, signature, Klass::OverpassLookupMode::skip);
368
369 if (klass->is_array_klass()) {
370 // Only consider klass and super klass for arrays
371 return result;
372 }
373
374 InstanceKlass* ik = InstanceKlass::cast(klass);
375
376 // JDK 8, JVMS 5.4.3.4: Interface method resolution should
377 // ignore static and non-public methods of java.lang.Object,
378 // like clone and finalize.
379 if (in_imethod_resolve &&
380 result != nullptr &&
381 ik->is_interface() &&
382 (result->is_static() || !result->is_public()) &&
383 result->method_holder() == vmClasses::Object_klass()) {
384 result = nullptr;
385 }
386
387 // Before considering default methods, check for an overpass in the
388 // current class if a method has not been found.
389 if (result == nullptr) {
390 result = ik->find_method(name, signature);
391 }
392
393 if (result == nullptr) {
394 Array<Method*>* default_methods = ik->default_methods();
395 if (default_methods != nullptr) {
396 result = InstanceKlass::find_method(default_methods, name, signature);
397 }
398 }
399
400 if (checkpolymorphism && result != nullptr) {
401 vmIntrinsics::ID iid = result->intrinsic_id();
402 if (MethodHandles::is_signature_polymorphic(iid)) {
403 // Do not link directly to these. The VM must produce a synthetic one using lookup_polymorphic_method.
404 return nullptr;
405 }
406 }
407 return result;
408 }
409
410 // returns first instance method
411 // Looks up method in classes, then looks up local default methods
412 Method* LinkResolver::lookup_instance_method_in_klasses(Klass* klass,
413 Symbol* name,
414 Symbol* signature,
415 Klass::PrivateLookupMode private_mode) {
416 Method* result = klass->uncached_lookup_method(name, signature, Klass::OverpassLookupMode::find, private_mode);
417
418 while (result != nullptr && result->is_static() && result->method_holder()->super() != nullptr) {
419 Klass* super_klass = result->method_holder()->super();
420 result = super_klass->uncached_lookup_method(name, signature, Klass::OverpassLookupMode::find, private_mode);
421 }
422
423 if (klass->is_array_klass()) {
424 // Only consider klass and super klass for arrays
425 return result;
426 }
427
428 if (result == nullptr) {
429 Array<Method*>* default_methods = InstanceKlass::cast(klass)->default_methods();
430 if (default_methods != nullptr) {
431 result = InstanceKlass::find_method(default_methods, name, signature);
432 assert(result == nullptr || !result->is_static(), "static defaults not allowed");
433 }
434 }
435 return result;
436 }
437
438 int LinkResolver::vtable_index_of_interface_method(Klass* klass, const methodHandle& resolved_method) {
439 InstanceKlass* ik = InstanceKlass::cast(klass);
440 return ik->vtable_index_of_interface_method(resolved_method());
441 }
442
443 Method* LinkResolver::lookup_method_in_interfaces(const LinkInfo& cp_info) {
444 InstanceKlass *ik = InstanceKlass::cast(cp_info.resolved_klass());
445
446 // Specify 'true' in order to skip default methods when searching the
447 // interfaces. Function lookup_method_in_klasses() already looked for
448 // the method in the default methods table.
449 return ik->lookup_method_in_all_interfaces(cp_info.name(), cp_info.signature(), Klass::DefaultsLookupMode::skip);
450 }
451
452 Method* LinkResolver::lookup_polymorphic_method(const LinkInfo& link_info,
453 Handle *appendix_result_or_null,
454 TRAPS) {
455 ResourceMark rm(THREAD);
456 Klass* klass = link_info.resolved_klass();
457 Symbol* name = link_info.name();
458 Symbol* full_signature = link_info.signature();
459 LogTarget(Info, methodhandles) lt_mh;
460
461 vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name);
462 log_info(methodhandles)("lookup_polymorphic_method iid=%s %s.%s%s",
463 vmIntrinsics::name_at(iid), klass->external_name(),
464 name->as_C_string(), full_signature->as_C_string());
465 if ((klass == vmClasses::MethodHandle_klass() ||
466 klass == vmClasses::VarHandle_klass()) &&
467 iid != vmIntrinsics::_none) {
468 if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) {
469 // Most of these do not need an up-call to Java to resolve, so can be done anywhere.
470 // Do not erase last argument type (MemberName) if it is a static linkTo method.
471 bool keep_last_arg = MethodHandles::is_signature_polymorphic_static(iid);
472 TempNewSymbol basic_signature =
473 MethodHandles::lookup_basic_type_signature(full_signature, keep_last_arg);
474 log_info(methodhandles)("lookup_polymorphic_method %s %s => basic %s",
475 name->as_C_string(),
476 full_signature->as_C_string(),
477 basic_signature->as_C_string());
478 Method* result = SystemDictionary::find_method_handle_intrinsic(iid,
479 basic_signature,
480 CHECK_NULL);
481 if (result != nullptr) {
482 assert(result->is_method_handle_intrinsic(), "MH.invokeBasic or MH.linkTo* intrinsic");
483 assert(result->intrinsic_id() != vmIntrinsics::_invokeGeneric, "wrong place to find this");
484 assert(basic_signature == result->signature(), "predict the result signature");
485 if (lt_mh.is_enabled()) {
486 LogStream ls(lt_mh);
487 ls.print("lookup_polymorphic_method => intrinsic ");
488 result->print_on(&ls);
489 }
490 }
491 return result;
492 } else if (iid == vmIntrinsics::_invokeGeneric
493 && THREAD->can_call_java()
494 && appendix_result_or_null != nullptr) {
495 // This is a method with type-checking semantics.
496 // We will ask Java code to spin an adapter method for it.
497 if (!MethodHandles::enabled()) {
498 // Make sure the Java part of the runtime has been booted up.
499 Klass* natives = vmClasses::MethodHandleNatives_klass();
500 if (natives == nullptr || InstanceKlass::cast(natives)->is_not_initialized()) {
501 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_invoke_MethodHandleNatives(),
502 Handle(),
503 true,
504 CHECK_NULL);
505 }
506 }
507
508 Handle appendix;
509 Method* result = SystemDictionary::find_method_handle_invoker(klass,
510 name,
511 full_signature,
512 link_info.current_klass(),
513 &appendix,
514 CHECK_NULL);
515 if (lt_mh.is_enabled()) {
516 LogStream ls(lt_mh);
517 ls.print("lookup_polymorphic_method => (via Java) ");
518 result->print_on(&ls);
519 ls.print(" lookup_polymorphic_method => appendix = ");
520 appendix.is_null() ? ls.print_cr("(none)") : appendix->print_on(&ls);
521 }
522 if (result != nullptr) {
523 #ifdef ASSERT
524 ResourceMark rm(THREAD);
525
526 TempNewSymbol basic_signature =
527 MethodHandles::lookup_basic_type_signature(full_signature);
528 int actual_size_of_params = result->size_of_parameters();
529 int expected_size_of_params = ArgumentSizeComputer(basic_signature).size();
530 // +1 for MethodHandle.this, +1 for trailing MethodType
531 if (!MethodHandles::is_signature_polymorphic_static(iid)) expected_size_of_params += 1;
532 if (appendix.not_null()) expected_size_of_params += 1;
533 if (actual_size_of_params != expected_size_of_params) {
534 tty->print_cr("*** basic_signature=%s", basic_signature->as_C_string());
535 tty->print_cr("*** result for %s: ", vmIntrinsics::name_at(iid));
536 result->print();
537 }
538 assert(actual_size_of_params == expected_size_of_params,
539 "%d != %d", actual_size_of_params, expected_size_of_params);
540 #endif //ASSERT
541
542 assert(appendix_result_or_null != nullptr, "");
543 (*appendix_result_or_null) = appendix;
544 }
545 return result;
546 }
547 }
548 return nullptr;
549 }
550
551 static void print_nest_host_error_on(stringStream* ss, Klass* ref_klass, Klass* sel_klass) {
552 assert(ref_klass->is_instance_klass(), "must be");
553 assert(sel_klass->is_instance_klass(), "must be");
554 InstanceKlass* ref_ik = InstanceKlass::cast(ref_klass);
555 InstanceKlass* sel_ik = InstanceKlass::cast(sel_klass);
556 const char* nest_host_error_1 = ref_ik->nest_host_error();
557 const char* nest_host_error_2 = sel_ik->nest_host_error();
558 if (nest_host_error_1 != nullptr || nest_host_error_2 != nullptr) {
559 ss->print(", (%s%s%s)",
560 (nest_host_error_1 != nullptr) ? nest_host_error_1 : "",
561 (nest_host_error_1 != nullptr && nest_host_error_2 != nullptr) ? ", " : "",
562 (nest_host_error_2 != nullptr) ? nest_host_error_2 : "");
563 }
564 }
565
566 void LinkResolver::check_method_accessability(Klass* ref_klass,
567 Klass* resolved_klass,
568 Klass* sel_klass,
569 const methodHandle& sel_method,
570 TRAPS) {
571
572 AccessFlags flags = sel_method->access_flags();
573
574 // Special case: arrays always override "clone". JVMS 2.15.
575 // If the resolved klass is an array class, and the declaring class
576 // is java.lang.Object and the method is "clone", set the flags
577 // to public.
578 //
579 // We'll check for the method name first, as that's most likely
580 // to be false (so we'll short-circuit out of these tests).
581 if (sel_method->name() == vmSymbols::clone_name() &&
582 sel_klass == vmClasses::Object_klass() &&
583 resolved_klass->is_array_klass()) {
584 // We need to change "protected" to "public".
585 assert(flags.is_protected(), "clone not protected?");
586 u2 new_flags = flags.as_method_flags();
587 new_flags = new_flags & (~JVM_ACC_PROTECTED);
588 new_flags = new_flags | JVM_ACC_PUBLIC;
589 flags.set_flags(new_flags);
590 }
591 // assert(extra_arg_result_or_null != nullptr, "must be able to return extra argument");
592
593 bool can_access = Reflection::verify_member_access(ref_klass,
594 resolved_klass,
595 sel_klass,
596 flags,
597 true, false, CHECK);
598 // Any existing exceptions that may have been thrown
599 // have been allowed to propagate.
600 if (!can_access) {
601 ResourceMark rm(THREAD);
602 stringStream ss;
603 bool same_module = (sel_klass->module() == ref_klass->module());
604 ss.print("class %s tried to access %s%s%smethod '%s' (%s%s%s)",
605 ref_klass->external_name(),
606 sel_method->is_abstract() ? "abstract " : "",
607 sel_method->is_protected() ? "protected " : "",
608 sel_method->is_private() ? "private " : "",
609 sel_method->external_name(),
610 (same_module) ? ref_klass->joint_in_module_of_loader(sel_klass) : ref_klass->class_in_module_of_loader(),
611 (same_module) ? "" : "; ",
612 (same_module) ? "" : sel_klass->class_in_module_of_loader()
613 );
614
615 // For private access see if there was a problem with nest host
616 // resolution, and if so report that as part of the message.
617 if (sel_method->is_private()) {
618 print_nest_host_error_on(&ss, ref_klass, sel_klass);
619 }
620
621 // Names are all known to be < 64k so we know this formatted message is not excessively large.
622 Exceptions::fthrow(THREAD_AND_LOCATION,
623 vmSymbols::java_lang_IllegalAccessError(),
624 "%s",
625 ss.as_string()
626 );
627 return;
628 }
629 }
630
631 void LinkResolver::resolve_continuation_enter(CallInfo& callinfo, TRAPS) {
632 Klass* resolved_klass = vmClasses::Continuation_klass();
633 Symbol* method_name = vmSymbols::enter_name();
634 Symbol* method_signature = vmSymbols::continuationEnter_signature();
635 Klass* current_klass = resolved_klass;
636 LinkInfo link_info(resolved_klass, method_name, method_signature, current_klass);
637 Method* resolved_method = resolve_method(link_info, Bytecodes::_invokestatic, CHECK);
638 callinfo.set_static(resolved_klass, methodHandle(THREAD, resolved_method), CHECK);
639 }
640
641 Method* LinkResolver::resolve_method_statically(Bytecodes::Code code,
642 const constantPoolHandle& pool, int index, TRAPS) {
643 // This method is used only
644 // (1) in C2 from InlineTree::ok_to_inline (via ciMethod::check_call),
645 // and
646 // (2) in Bytecode_invoke::static_target
647 // It appears to fail when applied to an invokeinterface call site.
648 // FIXME: Remove this method and ciMethod::check_call; refactor to use the other LinkResolver entry points.
649 // resolve klass
650 if (code == Bytecodes::_invokedynamic) {
651 Klass* resolved_klass = vmClasses::MethodHandle_klass();
652 Symbol* method_name = vmSymbols::invoke_name();
653 Symbol* method_signature = pool->signature_ref_at(index, code);
654 Klass* current_klass = pool->pool_holder();
655 LinkInfo link_info(resolved_klass, method_name, method_signature, current_klass);
656 return resolve_method(link_info, code, THREAD);
657 }
658
659 LinkInfo link_info(pool, index, methodHandle(), code, CHECK_NULL);
660 Klass* resolved_klass = link_info.resolved_klass();
661
662 if (pool->has_preresolution()
663 || ((resolved_klass == vmClasses::MethodHandle_klass() || resolved_klass == vmClasses::VarHandle_klass()) &&
664 MethodHandles::is_signature_polymorphic_name(resolved_klass, link_info.name()))) {
665 Method* result = ConstantPool::method_at_if_loaded(pool, index);
666 if (result != nullptr) {
667 return result;
668 }
669 }
670
671 if (code == Bytecodes::_invokeinterface) {
672 return resolve_interface_method(link_info, code, THREAD);
673 } else if (code == Bytecodes::_invokevirtual) {
674 return resolve_method(link_info, code, THREAD);
675 } else if (!resolved_klass->is_interface()) {
676 return resolve_method(link_info, code, THREAD);
677 } else {
678 return resolve_interface_method(link_info, code, THREAD);
679 }
680 }
681
682 // Check and print a loader constraint violation message for method or interface method
683 void LinkResolver::check_method_loader_constraints(const LinkInfo& link_info,
684 const methodHandle& resolved_method,
685 const char* method_type, TRAPS) {
686 Handle current_loader(THREAD, link_info.current_klass()->class_loader());
687 Handle resolved_loader(THREAD, resolved_method->method_holder()->class_loader());
688
689 ResourceMark rm(THREAD);
690 Symbol* failed_type_symbol =
691 SystemDictionary::check_signature_loaders(link_info.signature(),
692 /*klass_being_linked*/ nullptr, // We are not linking class
693 current_loader,
694 resolved_loader, true);
695 if (failed_type_symbol != nullptr) {
696 Klass* current_class = link_info.current_klass();
697 ClassLoaderData* current_loader_data = current_class->class_loader_data();
698 assert(current_loader_data != nullptr, "current class has no class loader data");
699 Klass* resolved_method_class = resolved_method->method_holder();
700 ClassLoaderData* target_loader_data = resolved_method_class->class_loader_data();
701 assert(target_loader_data != nullptr, "resolved method's class has no class loader data");
702
703 stringStream ss;
704 ss.print("loader constraint violation: when resolving %s '", method_type);
705 Method::print_external_name(&ss, link_info.resolved_klass(), link_info.name(), link_info.signature());
706 ss.print("' the class loader %s of the current class, %s,"
707 " and the class loader %s for the method's defining class, %s, have"
708 " different Class objects for the type %s used in the signature (%s; %s)",
709 current_loader_data->loader_name_and_id(),
710 current_class->name()->as_C_string(),
711 target_loader_data->loader_name_and_id(),
712 resolved_method_class->name()->as_C_string(),
713 failed_type_symbol->as_C_string(),
714 current_class->class_in_module_of_loader(false, true),
715 resolved_method_class->class_in_module_of_loader(false, true));
716 THROW_MSG(vmSymbols::java_lang_LinkageError(), ss.as_string());
717 }
718 }
719
720 void LinkResolver::check_field_loader_constraints(Symbol* field, Symbol* sig,
721 Klass* current_klass,
722 Klass* sel_klass, TRAPS) {
723 Handle ref_loader(THREAD, current_klass->class_loader());
724 Handle sel_loader(THREAD, sel_klass->class_loader());
725
726 ResourceMark rm(THREAD); // needed for check_signature_loaders
727 Symbol* failed_type_symbol =
728 SystemDictionary::check_signature_loaders(sig,
729 /*klass_being_linked*/ nullptr, // We are not linking class
730 ref_loader, sel_loader,
731 false);
732 if (failed_type_symbol != nullptr) {
733 stringStream ss;
734 const char* failed_type_name = failed_type_symbol->as_klass_external_name();
735
736 ss.print("loader constraint violation: when resolving field \"%s\" of type %s, "
737 "the class loader %s of the current class, %s, "
738 "and the class loader %s for the field's defining %s, %s, "
739 "have different Class objects for type %s (%s; %s)",
740 field->as_C_string(),
741 failed_type_name,
742 current_klass->class_loader_data()->loader_name_and_id(),
743 current_klass->external_name(),
744 sel_klass->class_loader_data()->loader_name_and_id(),
745 sel_klass->external_kind(),
746 sel_klass->external_name(),
747 failed_type_name,
748 current_klass->class_in_module_of_loader(false, true),
749 sel_klass->class_in_module_of_loader(false, true));
750 THROW_MSG(vmSymbols::java_lang_LinkageError(), ss.as_string());
751 }
752 }
753
754 Method* LinkResolver::resolve_method(const LinkInfo& link_info,
755 Bytecodes::Code code, TRAPS) {
756
757 Handle nested_exception;
758 Klass* resolved_klass = link_info.resolved_klass();
759
760 // 1. For invokevirtual, cannot call an interface method
761 if (code == Bytecodes::_invokevirtual && resolved_klass->is_interface()) {
762 ResourceMark rm(THREAD);
763 char buf[200];
764 jio_snprintf(buf, sizeof(buf), "Found interface %s, but class was expected",
765 resolved_klass->external_name());
766 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
767 }
768
769 // 2. check constant pool tag for called method - must be JVM_CONSTANT_Methodref
770 if (!link_info.tag().is_invalid() && !link_info.tag().is_method()) {
771 ResourceMark rm(THREAD);
772 stringStream ss;
773 ss.print("Method '");
774 Method::print_external_name(&ss, link_info.resolved_klass(), link_info.name(), link_info.signature());
775 ss.print("' must be Methodref constant");
776 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
777 }
778
779 // 3. lookup method in resolved klass and its super klasses
780 methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, true, false));
781
782 // 4. lookup method in all the interfaces implemented by the resolved klass
783 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) { // not found in the class hierarchy
784 resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info));
785
786 if (resolved_method.is_null()) {
787 // JSR 292: see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc
788 Method* method = lookup_polymorphic_method(link_info, (Handle*)nullptr, THREAD);
789 resolved_method = methodHandle(THREAD, method);
790 if (HAS_PENDING_EXCEPTION) {
791 nested_exception = Handle(THREAD, PENDING_EXCEPTION);
792 CLEAR_PENDING_EXCEPTION;
793 }
794 }
795 }
796
797 // 5. method lookup failed
798 if (resolved_method.is_null()) {
799 ResourceMark rm(THREAD);
800 stringStream ss;
801 ss.print("'");
802 Method::print_external_name(&ss, resolved_klass, link_info.name(), link_info.signature());
803 ss.print("'");
804 THROW_MSG_CAUSE_(vmSymbols::java_lang_NoSuchMethodError(),
805 ss.as_string(), nested_exception, nullptr);
806 }
807
808 // 6. access checks, access checking may be turned off when calling from within the VM.
809 Klass* current_klass = link_info.current_klass();
810 if (link_info.check_access()) {
811 assert(current_klass != nullptr , "current_klass should not be null");
812
813 // check if method can be accessed by the referring class
814 check_method_accessability(current_klass,
815 resolved_klass,
816 resolved_method->method_holder(),
817 resolved_method,
818 CHECK_NULL);
819 }
820 if (link_info.check_loader_constraints()) {
821 // check loader constraints
822 check_method_loader_constraints(link_info, resolved_method, "method", CHECK_NULL);
823 }
824
825 return resolved_method();
826 }
827
828 static void trace_method_resolution(const char* prefix,
829 Klass* klass,
830 Klass* resolved_klass,
831 Method* method,
832 bool logitables,
833 int index = -1) {
834 #ifndef PRODUCT
835 ResourceMark rm;
836 Log(itables) logi;
837 LogStream lsi(logi.trace());
838 Log(vtables) logv;
839 LogStream lsv(logv.trace());
840 outputStream* st;
841 if (logitables) {
842 st = &lsi;
843 } else {
844 st = &lsv;
845 }
846 st->print("%s%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ",
847 prefix,
848 (klass == nullptr ? "<null>" : klass->internal_name()),
849 resolved_klass->internal_name(),
850 Method::name_and_sig_as_C_string(resolved_klass,
851 method->name(),
852 method->signature()),
853 method->method_holder()->internal_name());
854 method->print_linkage_flags(st);
855 if (index != -1) {
856 st->print("vtable_index:%d", index);
857 }
858 st->cr();
859 #endif // PRODUCT
860 }
861
862 // Do linktime resolution of a method in the interface within the context of the specified bytecode.
863 Method* LinkResolver::resolve_interface_method(const LinkInfo& link_info, Bytecodes::Code code, TRAPS) {
864
865 Klass* resolved_klass = link_info.resolved_klass();
866
867 // check if klass is interface
868 if (!resolved_klass->is_interface()) {
869 ResourceMark rm(THREAD);
870 char buf[200];
871 jio_snprintf(buf, sizeof(buf), "Found class %s, but interface was expected", resolved_klass->external_name());
872 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
873 }
874
875 // check constant pool tag for called method - must be JVM_CONSTANT_InterfaceMethodref
876 if (!link_info.tag().is_invalid() && !link_info.tag().is_interface_method()) {
877 ResourceMark rm(THREAD);
878 stringStream ss;
879 ss.print("Method '");
880 Method::print_external_name(&ss, link_info.resolved_klass(), link_info.name(), link_info.signature());
881 ss.print("' must be InterfaceMethodref constant");
882 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
883 }
884
885 // lookup method in this interface or its super, java.lang.Object
886 // JDK8: also look for static methods
887 methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, false, true));
888
889 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) {
890 // lookup method in all the super-interfaces
891 resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info));
892 }
893
894 if (resolved_method.is_null()) {
895 // no method found
896 ResourceMark rm(THREAD);
897 stringStream ss;
898 ss.print("'");
899 Method::print_external_name(&ss, resolved_klass, link_info.name(), link_info.signature());
900 ss.print("'");
901 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), ss.as_string());
902 }
903
904 if (link_info.check_access()) {
905 // JDK8 adds non-public interface methods, and accessability check requirement
906 Klass* current_klass = link_info.current_klass();
907
908 assert(current_klass != nullptr , "current_klass should not be null");
909
910 // check if method can be accessed by the referring class
911 check_method_accessability(current_klass,
912 resolved_klass,
913 resolved_method->method_holder(),
914 resolved_method,
915 CHECK_NULL);
916 }
917 if (link_info.check_loader_constraints()) {
918 check_method_loader_constraints(link_info, resolved_method, "interface method", CHECK_NULL);
919 }
920
921 if (code != Bytecodes::_invokestatic && resolved_method->is_static()) {
922 ResourceMark rm(THREAD);
923 stringStream ss;
924 ss.print("Expected instance not static method '");
925 Method::print_external_name(&ss, resolved_klass,
926 resolved_method->name(), resolved_method->signature());
927 ss.print("'");
928 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
929 }
930
931 if (log_develop_is_enabled(Trace, itables)) {
932 char buf[200];
933 jio_snprintf(buf, sizeof(buf), "%s resolved interface method: caller-class:",
934 Bytecodes::name(code));
935 trace_method_resolution(buf, link_info.current_klass(), resolved_klass, resolved_method(), true);
936 }
937
938 return resolved_method();
939 }
940
941 //------------------------------------------------------------------------------------------------------------------------
942 // Field resolution
943
944 void LinkResolver::check_field_accessability(Klass* ref_klass,
945 Klass* resolved_klass,
946 Klass* sel_klass,
947 const fieldDescriptor& fd,
948 TRAPS) {
949 bool can_access = Reflection::verify_member_access(ref_klass,
950 resolved_klass,
951 sel_klass,
952 fd.access_flags(),
953 true, false, CHECK);
954 // Any existing exceptions that may have been thrown, for example LinkageErrors
955 // from nest-host resolution, have been allowed to propagate.
956 if (!can_access) {
957 bool same_module = (sel_klass->module() == ref_klass->module());
958 ResourceMark rm(THREAD);
959 stringStream ss;
960 ss.print("class %s tried to access %s%sfield %s.%s (%s%s%s)",
961 ref_klass->external_name(),
962 fd.is_protected() ? "protected " : "",
963 fd.is_private() ? "private " : "",
964 sel_klass->external_name(),
965 fd.name()->as_C_string(),
966 (same_module) ? ref_klass->joint_in_module_of_loader(sel_klass) : ref_klass->class_in_module_of_loader(),
967 (same_module) ? "" : "; ",
968 (same_module) ? "" : sel_klass->class_in_module_of_loader()
969 );
970 // For private access see if there was a problem with nest host
971 // resolution, and if so report that as part of the message.
972 if (fd.is_private()) {
973 print_nest_host_error_on(&ss, ref_klass, sel_klass);
974 }
975 // Names are all known to be < 64k so we know this formatted message is not excessively large.
976 Exceptions::fthrow(THREAD_AND_LOCATION,
977 vmSymbols::java_lang_IllegalAccessError(),
978 "%s",
979 ss.as_string()
980 );
981 return;
982 }
983 }
984
985 void LinkResolver::resolve_field_access(fieldDescriptor& fd,
986 const constantPoolHandle& pool,
987 int index,
988 const methodHandle& method,
989 Bytecodes::Code byte,
990 bool initialize_class, TRAPS) {
991 LinkInfo link_info(pool, index, method, byte, CHECK);
992 resolve_field(fd, link_info, byte, initialize_class, CHECK);
993 }
994
995 void LinkResolver::resolve_field(fieldDescriptor& fd,
996 const LinkInfo& link_info,
997 Bytecodes::Code byte,
998 bool initialize_class,
999 TRAPS) {
1000 assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic ||
1001 byte == Bytecodes::_getfield || byte == Bytecodes::_putfield ||
1002 byte == Bytecodes::_nofast_getfield || byte == Bytecodes::_nofast_putfield ||
1003 (byte == Bytecodes::_nop && !link_info.check_access()), "bad field access bytecode");
1004
1005 bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic);
1006 bool is_put = (byte == Bytecodes::_putfield || byte == Bytecodes::_putstatic || byte == Bytecodes::_nofast_putfield);
1007 // Check if there's a resolved klass containing the field
1008 Klass* resolved_klass = link_info.resolved_klass();
1009 Symbol* field = link_info.name();
1010 Symbol* sig = link_info.signature();
1011
1012 // Resolve instance field
1013 Klass* sel_klass = resolved_klass->find_field(field, sig, &fd);
1014 // check if field exists; i.e., if a klass containing the field def has been selected
1015 if (sel_klass == nullptr) {
1016 ResourceMark rm(THREAD);
1017 stringStream ss;
1018 ss.print("Class %s does not have member field '", resolved_klass->external_name());
1019 sig->print_as_field_external_type(&ss);
1020 ss.print(" %s'", field->as_C_string());
1021 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), ss.as_string());
1022 }
1023
1024 // Access checking may be turned off when calling from within the VM.
1025 Klass* current_klass = link_info.current_klass();
1026 if (link_info.check_access()) {
1027
1028 // check access
1029 check_field_accessability(current_klass, resolved_klass, sel_klass, fd, CHECK);
1030
1031 // check for errors
1032 if (is_static != fd.is_static()) {
1033 ResourceMark rm(THREAD);
1034 char msg[200];
1035 jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string());
1036 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg);
1037 }
1038
1039 // A final field can be modified only
1040 // (1) by methods declared in the class declaring the field and
1041 // (2) by the <clinit> method (in case of a static field)
1042 // or by the <init> method (in case of an instance field).
1043 if (is_put && fd.access_flags().is_final()) {
1044
1045 if (sel_klass != current_klass) {
1046 ResourceMark rm(THREAD);
1047 stringStream ss;
1048 ss.print("Update to %s final field %s.%s attempted from a different class (%s) than the field's declaring class",
1049 is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(),
1050 current_klass->external_name());
1051 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
1052 }
1053
1054 if (fd.constants()->pool_holder()->major_version() >= 53) {
1055 Method* m = link_info.current_method();
1056 assert(m != nullptr, "information about the current method must be available for 'put' bytecodes");
1057 bool is_initialized_static_final_update = (byte == Bytecodes::_putstatic &&
1058 fd.is_static() &&
1059 !m->is_static_initializer());
1060 bool is_initialized_instance_final_update = ((byte == Bytecodes::_putfield || byte == Bytecodes::_nofast_putfield) &&
1061 !fd.is_static() &&
1062 !m->is_object_initializer());
1063
1064 if (is_initialized_static_final_update || is_initialized_instance_final_update) {
1065 ResourceMark rm(THREAD);
1066 stringStream ss;
1067 ss.print("Update to %s final field %s.%s attempted from a different method (%s) than the initializer method %s ",
1068 is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(),
1069 m->name()->as_C_string(),
1070 is_static ? "<clinit>" : "<init>");
1071 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
1072 }
1073 }
1074 }
1075
1076 // initialize resolved_klass if necessary
1077 // note 1: the klass which declared the field must be initialized (i.e, sel_klass)
1078 // according to the newest JVM spec (5.5, p.170) - was bug (gri 7/28/99)
1079 //
1080 // note 2: we don't want to force initialization if we are just checking
1081 // if the field access is legal; e.g., during compilation
1082 if (is_static && initialize_class) {
1083 sel_klass->initialize(CHECK);
1084 }
1085 }
1086
1087 if (link_info.check_loader_constraints() && (sel_klass != current_klass) && (current_klass != nullptr)) {
1088 check_field_loader_constraints(field, sig, current_klass, sel_klass, CHECK);
1089 }
1090
1091 // return information. note that the klass is set to the actual klass containing the
1092 // field, otherwise access of static fields in superclasses will not work.
1093 }
1094
1095
1096 //------------------------------------------------------------------------------------------------------------------------
1097 // Invoke resolution
1098 //
1099 // Naming conventions:
1100 //
1101 // resolved_method the specified method (i.e., static receiver specified via constant pool index)
1102 // sel_method the selected method (selected via run-time lookup; e.g., based on dynamic receiver class)
1103 // resolved_klass the specified klass (i.e., specified via constant pool index)
1104 // recv_klass the receiver klass
1105
1106
1107 void LinkResolver::resolve_static_call(CallInfo& result,
1108 const LinkInfo& link_info,
1109 bool initialize_class, TRAPS) {
1110 Method* resolved_method = linktime_resolve_static_method(link_info, CHECK);
1111
1112 // The resolved class can change as a result of this resolution.
1113 Klass* resolved_klass = resolved_method->method_holder();
1114
1115 // Initialize klass (this should only happen if everything is ok)
1116 if (initialize_class && resolved_klass->should_be_initialized()) {
1117 resolved_klass->initialize(CHECK);
1118 // Use updated LinkInfo to reresolve with resolved method holder
1119 LinkInfo new_info(resolved_klass, link_info.name(), link_info.signature(),
1120 link_info.current_klass(),
1121 link_info.check_access() ? LinkInfo::AccessCheck::required : LinkInfo::AccessCheck::skip,
1122 link_info.check_loader_constraints() ? LinkInfo::LoaderConstraintCheck::required : LinkInfo::LoaderConstraintCheck::skip);
1123 resolved_method = linktime_resolve_static_method(new_info, CHECK);
1124 }
1125
1126 // setup result
1127 result.set_static(resolved_klass, methodHandle(THREAD, resolved_method), CHECK);
1128 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1129 }
1130
1131 void LinkResolver::cds_resolve_static_call(CallInfo& result, const LinkInfo& link_info, TRAPS) {
1132 resolve_static_call(result, link_info, /*initialize_class*/false, CHECK);
1133 }
1134
1135 // throws linktime exceptions
1136 Method* LinkResolver::linktime_resolve_static_method(const LinkInfo& link_info, TRAPS) {
1137
1138 Klass* resolved_klass = link_info.resolved_klass();
1139 Method* resolved_method;
1140 if (!resolved_klass->is_interface()) {
1141 resolved_method = resolve_method(link_info, Bytecodes::_invokestatic, CHECK_NULL);
1142 } else {
1143 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokestatic, CHECK_NULL);
1144 }
1145 assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier");
1146
1147 // check if static
1148 if (!resolved_method->is_static()) {
1149 ResourceMark rm(THREAD);
1150 stringStream ss;
1151 ss.print("Expected static method '");
1152 resolved_method->print_external_name(&ss);
1153 ss.print("'");
1154 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1155 }
1156 return resolved_method;
1157 }
1158
1159
1160 void LinkResolver::resolve_special_call(CallInfo& result,
1161 Handle recv,
1162 const LinkInfo& link_info,
1163 TRAPS) {
1164 Method* resolved_method = linktime_resolve_special_method(link_info, CHECK);
1165 runtime_resolve_special_method(result, link_info, methodHandle(THREAD, resolved_method), recv, CHECK);
1166 }
1167
1168 void LinkResolver::cds_resolve_special_call(CallInfo& result, const LinkInfo& link_info, TRAPS) {
1169 resolve_special_call(result, Handle(), link_info, CHECK);
1170 }
1171
1172 // throws linktime exceptions
1173 Method* LinkResolver::linktime_resolve_special_method(const LinkInfo& link_info, TRAPS) {
1174
1175 // Invokespecial is called for multiple special reasons:
1176 // <init>
1177 // local private method invocation, for classes and interfaces
1178 // superclass.method, which can also resolve to a default method
1179 // and the selected method is recalculated relative to the direct superclass
1180 // superinterface.method, which explicitly does not check shadowing
1181 Klass* resolved_klass = link_info.resolved_klass();
1182 Method* resolved_method = nullptr;
1183
1184 if (!resolved_klass->is_interface()) {
1185 resolved_method = resolve_method(link_info, Bytecodes::_invokespecial, CHECK_NULL);
1186 } else {
1187 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokespecial, CHECK_NULL);
1188 }
1189
1190 // check if method name is <init>, that it is found in same klass as static type
1191 if (resolved_method->name() == vmSymbols::object_initializer_name() &&
1192 resolved_method->method_holder() != resolved_klass) {
1193 ResourceMark rm(THREAD);
1194 stringStream ss;
1195 ss.print("%s: method '", resolved_klass->external_name());
1196 resolved_method->signature()->print_as_signature_external_return_type(&ss);
1197 ss.print(" %s(", resolved_method->name()->as_C_string());
1198 resolved_method->signature()->print_as_signature_external_parameters(&ss);
1199 ss.print(")' not found");
1200 // Names are all known to be < 64k so we know this formatted message is not excessively large.
1201 Exceptions::fthrow(
1202 THREAD_AND_LOCATION,
1203 vmSymbols::java_lang_NoSuchMethodError(),
1204 "%s", ss.as_string());
1205 return nullptr;
1206 }
1207
1208 // ensure that invokespecial's interface method reference is in
1209 // a direct superinterface, not an indirect superinterface
1210 Klass* current_klass = link_info.current_klass();
1211 if (current_klass != nullptr && resolved_klass->is_interface()) {
1212 InstanceKlass* klass_to_check = InstanceKlass::cast(current_klass);
1213 if (!klass_to_check->is_same_or_direct_interface(resolved_klass)) {
1214 ResourceMark rm(THREAD);
1215 stringStream ss;
1216 ss.print("Interface method reference: '");
1217 resolved_method->print_external_name(&ss);
1218 ss.print("', is in an indirect superinterface of %s",
1219 current_klass->external_name());
1220 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1221 }
1222 }
1223
1224 // check if not static
1225 if (resolved_method->is_static()) {
1226 ResourceMark rm(THREAD);
1227 stringStream ss;
1228 ss.print("Expecting non-static method '");
1229 resolved_method->print_external_name(&ss);
1230 ss.print("'");
1231 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1232 }
1233
1234 if (log_develop_is_enabled(Trace, itables)) {
1235 trace_method_resolution("invokespecial resolved method: caller-class:",
1236 current_klass, resolved_klass, resolved_method, true);
1237 }
1238
1239 return resolved_method;
1240 }
1241
1242 // throws runtime exceptions
1243 void LinkResolver::runtime_resolve_special_method(CallInfo& result,
1244 const LinkInfo& link_info,
1245 const methodHandle& resolved_method,
1246 Handle recv, TRAPS) {
1247
1248 Klass* resolved_klass = link_info.resolved_klass();
1249
1250 // resolved method is selected method unless we have an old-style lookup
1251 // for a superclass method
1252 // Invokespecial for a superinterface, resolved method is selected method,
1253 // no checks for shadowing
1254 methodHandle sel_method(THREAD, resolved_method());
1255
1256 if (link_info.check_access() &&
1257 // check if the method is not <init>
1258 resolved_method->name() != vmSymbols::object_initializer_name()) {
1259
1260 Klass* current_klass = link_info.current_klass();
1261
1262 // Check if the class of the resolved_klass is a superclass
1263 // (not supertype in order to exclude interface classes) of the current class.
1264 // This check is not performed for super.invoke for interface methods
1265 // in super interfaces.
1266 if (current_klass->is_subclass_of(resolved_klass) &&
1267 current_klass != resolved_klass) {
1268 // Lookup super method
1269 Klass* super_klass = current_klass->super();
1270 Method* instance_method = lookup_instance_method_in_klasses(super_klass,
1271 resolved_method->name(),
1272 resolved_method->signature(),
1273 Klass::PrivateLookupMode::find);
1274 sel_method = methodHandle(THREAD, instance_method);
1275
1276 // check if found
1277 if (sel_method.is_null()) {
1278 ResourceMark rm(THREAD);
1279 stringStream ss;
1280 ss.print("'");
1281 resolved_method->print_external_name(&ss);
1282 ss.print("'");
1283 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1284 // check loader constraints if found a different method
1285 } else if (link_info.check_loader_constraints() && sel_method() != resolved_method()) {
1286 check_method_loader_constraints(link_info, sel_method, "method", CHECK);
1287 }
1288 }
1289
1290 // Check that the class of objectref (the receiver) is the current class or interface,
1291 // or a subtype of the current class or interface (the sender), otherwise invokespecial
1292 // throws IllegalAccessError.
1293 // The verifier checks that the sender is a subtype of the class in the I/MR operand.
1294 // The verifier also checks that the receiver is a subtype of the sender, if the sender is
1295 // a class. If the sender is an interface, the check has to be performed at runtime.
1296 InstanceKlass* sender = InstanceKlass::cast(current_klass);
1297 if (sender->is_interface() && recv.not_null()) {
1298 Klass* receiver_klass = recv->klass();
1299 if (!receiver_klass->is_subtype_of(sender)) {
1300 ResourceMark rm(THREAD);
1301 char buf[500];
1302 jio_snprintf(buf, sizeof(buf),
1303 "Receiver class %s must be the current class or a subtype of interface %s",
1304 receiver_klass->external_name(),
1305 sender->external_name());
1306 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), buf);
1307 }
1308 }
1309 }
1310
1311 // check if not static
1312 if (sel_method->is_static()) {
1313 ResourceMark rm(THREAD);
1314 stringStream ss;
1315 ss.print("Expecting non-static method '");
1316 resolved_method->print_external_name(&ss);
1317 ss.print("'");
1318 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1319 }
1320
1321 // check if abstract
1322 if (sel_method->is_abstract()) {
1323 ResourceMark rm(THREAD);
1324 stringStream ss;
1325 ss.print("'");
1326 Method::print_external_name(&ss, resolved_klass, sel_method->name(), sel_method->signature());
1327 ss.print("'");
1328 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1329 }
1330
1331 if (log_develop_is_enabled(Trace, itables)) {
1332 trace_method_resolution("invokespecial selected method: resolved-class:",
1333 resolved_klass, resolved_klass, sel_method(), true);
1334 }
1335
1336 // setup result
1337 result.set_static(resolved_klass, sel_method, CHECK);
1338 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1339 }
1340
1341 void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, Klass* receiver_klass,
1342 const LinkInfo& link_info,
1343 bool check_null_and_abstract, TRAPS) {
1344 Method* resolved_method = linktime_resolve_virtual_method(link_info, CHECK);
1345 runtime_resolve_virtual_method(result, methodHandle(THREAD, resolved_method),
1346 link_info.resolved_klass(),
1347 recv, receiver_klass,
1348 check_null_and_abstract,
1349 /*is_abstract_interpretation*/ false, CHECK);
1350 }
1351
1352 void LinkResolver::cds_resolve_virtual_call(CallInfo& result, const LinkInfo& link_info, TRAPS) {
1353 Method* resolved_method = linktime_resolve_virtual_method(link_info, CHECK);
1354 runtime_resolve_virtual_method(result, methodHandle(THREAD, resolved_method),
1355 link_info.resolved_klass(),
1356 Handle(), nullptr,
1357 /*check_null_and_abstract*/ false,
1358 /*is_abstract_interpretation*/ true, CHECK);
1359 }
1360
1361 // throws linktime exceptions
1362 Method* LinkResolver::linktime_resolve_virtual_method(const LinkInfo& link_info,
1363 TRAPS) {
1364 // normal method resolution
1365 Method* resolved_method = resolve_method(link_info, Bytecodes::_invokevirtual, CHECK_NULL);
1366
1367 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1368 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1369
1370 // check if private interface method
1371 Klass* resolved_klass = link_info.resolved_klass();
1372 Klass* current_klass = link_info.current_klass();
1373
1374 // This is impossible, if resolve_klass is an interface, we've thrown icce in resolve_method
1375 if (resolved_klass->is_interface() && resolved_method->is_private()) {
1376 ResourceMark rm(THREAD);
1377 stringStream ss;
1378 ss.print("private interface method requires invokespecial, not invokevirtual: method '");
1379 resolved_method->print_external_name(&ss);
1380 ss.print("', caller-class: %s",
1381 (current_klass == nullptr ? "<null>" : current_klass->internal_name()));
1382 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1383 }
1384
1385 // check if not static
1386 if (resolved_method->is_static()) {
1387 ResourceMark rm(THREAD);
1388 stringStream ss;
1389 ss.print("Expecting non-static method '");
1390 resolved_method->print_external_name(&ss);
1391 ss.print("'");
1392 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1393 }
1394
1395 if (log_develop_is_enabled(Trace, vtables)) {
1396 trace_method_resolution("invokevirtual resolved method: caller-class:",
1397 current_klass, resolved_klass, resolved_method, false);
1398 }
1399
1400 return resolved_method;
1401 }
1402
1403 // throws runtime exceptions
1404 void LinkResolver::runtime_resolve_virtual_method(CallInfo& result,
1405 const methodHandle& resolved_method,
1406 Klass* resolved_klass,
1407 Handle recv,
1408 Klass* recv_klass,
1409 bool check_null_and_abstract,
1410 bool is_abstract_interpretation,
1411 TRAPS) {
1412 // is_abstract_interpretation is true IFF CDS is resolving method references without
1413 // running any actual bytecode. Therefore, we don't have an actual recv/recv_klass, so
1414 // we cannot check the actual selected_method (which is not needed by CDS anyway).
1415
1416 // setup default return values
1417 int vtable_index = Method::invalid_vtable_index;
1418 methodHandle selected_method;
1419
1420 // runtime method resolution
1421 if (check_null_and_abstract && recv.is_null()) { // check if receiver exists
1422 THROW(vmSymbols::java_lang_NullPointerException());
1423 }
1424
1425 // Virtual methods cannot be resolved before its klass has been linked, for otherwise the Method*'s
1426 // has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since
1427 // a missing receiver might result in a bogus lookup.
1428 assert(resolved_method->method_holder()->is_linked(), "must be linked");
1429
1430 // do lookup based on receiver klass using the vtable index
1431 if (resolved_method->method_holder()->is_interface()) { // default or miranda method
1432 vtable_index = vtable_index_of_interface_method(resolved_klass, resolved_method);
1433 assert(vtable_index >= 0 , "we should have valid vtable index at this point");
1434
1435 if (!is_abstract_interpretation) {
1436 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1437 }
1438 } else {
1439 // at this point we are sure that resolved_method is virtual and not
1440 // a default or miranda method; therefore, it must have a valid vtable index.
1441 assert(!resolved_method->has_itable_index(), "");
1442 vtable_index = resolved_method->vtable_index();
1443 // We could get a negative vtable_index of nonvirtual_vtable_index for private
1444 // methods, or for final methods. Private methods never appear in the vtable
1445 // and never override other methods. As an optimization, final methods are
1446 // never put in the vtable, unless they override an existing method.
1447 // So if we do get nonvirtual_vtable_index, it means the selected method is the
1448 // resolved method, and it can never be changed by an override.
1449 if (vtable_index == Method::nonvirtual_vtable_index) {
1450 assert(resolved_method->can_be_statically_bound(), "cannot override this method");
1451 if (!is_abstract_interpretation) {
1452 selected_method = resolved_method;
1453 }
1454 } else {
1455 if (!is_abstract_interpretation) {
1456 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1457 }
1458 }
1459 }
1460
1461 if (!is_abstract_interpretation) {
1462 // check if method exists
1463 if (selected_method.is_null()) {
1464 throw_abstract_method_error(resolved_method, recv_klass, CHECK);
1465 }
1466
1467 // check if abstract
1468 if (check_null_and_abstract && selected_method->is_abstract()) {
1469 // Pass arguments for generating a verbose error message.
1470 throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK);
1471 }
1472
1473 if (log_develop_is_enabled(Trace, vtables)) {
1474 trace_method_resolution("invokevirtual selected method: receiver-class:",
1475 recv_klass, resolved_klass, selected_method(),
1476 false, vtable_index);
1477 }
1478 }
1479
1480 // setup result
1481 result.set_virtual(resolved_klass, resolved_method, selected_method, vtable_index, CHECK);
1482 if (selected_method.not_null()) {
1483 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1484 }
1485 }
1486
1487 void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, Klass* recv_klass,
1488 const LinkInfo& link_info,
1489 bool check_null_and_abstract, TRAPS) {
1490 // throws linktime exceptions
1491 Method* resolved_method = linktime_resolve_interface_method(link_info, CHECK);
1492 methodHandle mh(THREAD, resolved_method);
1493 runtime_resolve_interface_method(result, mh, link_info.resolved_klass(),
1494 recv, recv_klass, check_null_and_abstract,
1495 /*is_abstract_interpretation*/ false, CHECK);
1496 }
1497
1498 void LinkResolver::cds_resolve_interface_call(CallInfo& result, const LinkInfo& link_info, TRAPS) {
1499 Method* resolved_method = linktime_resolve_interface_method(link_info, CHECK);
1500 runtime_resolve_interface_method(result, methodHandle(THREAD, resolved_method), link_info.resolved_klass(),
1501 Handle(), nullptr,
1502 /*check_null_and_abstract*/ false,
1503 /*is_abstract_interpretation*/ true, CHECK);
1504 }
1505
1506 Method* LinkResolver::linktime_resolve_interface_method(const LinkInfo& link_info,
1507 TRAPS) {
1508 // normal interface method resolution
1509 Method* resolved_method = resolve_interface_method(link_info, Bytecodes::_invokeinterface, CHECK_NULL);
1510 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1511 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1512
1513 return resolved_method;
1514 }
1515
1516 // throws runtime exceptions
1517 void LinkResolver::runtime_resolve_interface_method(CallInfo& result,
1518 const methodHandle& resolved_method,
1519 Klass* resolved_klass,
1520 Handle recv,
1521 Klass* recv_klass,
1522 bool check_null_and_abstract,
1523 bool is_abstract_interpretation, TRAPS) {
1524 // is_abstract_interpretation -- see comments in runtime_resolve_virtual_method()
1525
1526 // check if receiver exists
1527 if (check_null_and_abstract && recv.is_null()) {
1528 THROW(vmSymbols::java_lang_NullPointerException());
1529 }
1530
1531 // check if receiver klass implements the resolved interface
1532 if (!is_abstract_interpretation && !recv_klass->is_subtype_of(resolved_klass)) {
1533 ResourceMark rm(THREAD);
1534 char buf[200];
1535 jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s",
1536 recv_klass->external_name(),
1537 resolved_klass->external_name());
1538 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1539 }
1540
1541 methodHandle selected_method;
1542
1543 if (!is_abstract_interpretation) {
1544 selected_method = resolved_method;
1545 }
1546
1547 // resolve the method in the receiver class, unless it is private
1548 if (!is_abstract_interpretation && !resolved_method->is_private()) {
1549 // do lookup based on receiver klass
1550 // This search must match the linktime preparation search for itable initialization
1551 // to correctly enforce loader constraints for interface method inheritance.
1552 // Private methods are skipped as the resolved method was not private.
1553 Method* method = lookup_instance_method_in_klasses(recv_klass,
1554 resolved_method->name(),
1555 resolved_method->signature(),
1556 Klass::PrivateLookupMode::skip);
1557 selected_method = methodHandle(THREAD, method);
1558
1559 if (selected_method.is_null() && !check_null_and_abstract) {
1560 // In theory this is a harmless placeholder value, but
1561 // in practice leaving in null affects the nsk default method tests.
1562 // This needs further study.
1563 selected_method = resolved_method;
1564 }
1565 // check if method exists
1566 if (selected_method.is_null()) {
1567 // Pass arguments for generating a verbose error message.
1568 throw_abstract_method_error(resolved_method, recv_klass, CHECK);
1569 }
1570 // check access
1571 // Throw Illegal Access Error if selected_method is not public.
1572 if (!selected_method->is_public()) {
1573 ResourceMark rm(THREAD);
1574 stringStream ss;
1575 ss.print("'");
1576 Method::print_external_name(&ss, recv_klass, selected_method->name(), selected_method->signature());
1577 ss.print("'");
1578 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
1579 }
1580 // check if abstract
1581 if (check_null_and_abstract && selected_method->is_abstract()) {
1582 throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK);
1583 }
1584 }
1585
1586 if (log_develop_is_enabled(Trace, itables)) {
1587 trace_method_resolution("invokeinterface selected method: receiver-class:",
1588 recv_klass, resolved_klass, selected_method(), true);
1589 }
1590 // setup result
1591 if (resolved_method->has_vtable_index()) {
1592 int vtable_index = resolved_method->vtable_index();
1593 log_develop_trace(itables)(" -- vtable index: %d", vtable_index);
1594 assert(is_abstract_interpretation || vtable_index == selected_method->vtable_index(), "sanity check");
1595 result.set_virtual(resolved_klass, resolved_method, selected_method, vtable_index, CHECK);
1596 } else if (resolved_method->has_itable_index()) {
1597 int itable_index = resolved_method->itable_index();
1598 log_develop_trace(itables)(" -- itable index: %d", itable_index);
1599 result.set_interface(resolved_klass, resolved_method, selected_method, itable_index, CHECK);
1600 } else {
1601 int index = resolved_method->vtable_index();
1602 log_develop_trace(itables)(" -- non itable/vtable index: %d", index);
1603 assert(index == Method::nonvirtual_vtable_index, "Oops hit another case!");
1604 assert(resolved_method->is_private() ||
1605 (resolved_method->is_final() && resolved_method->method_holder() == vmClasses::Object_klass()),
1606 "Should only have non-virtual invokeinterface for private or final-Object methods!");
1607 assert(resolved_method->can_be_statically_bound(), "Should only have non-virtual invokeinterface for statically bound methods!");
1608 // This sets up the nonvirtual form of "virtual" call (as needed for final and private methods)
1609 result.set_virtual(resolved_klass, resolved_method, resolved_method, index, CHECK);
1610 }
1611 if (!is_abstract_interpretation) {
1612 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1613 }
1614 }
1615
1616
1617 Method* LinkResolver::linktime_resolve_interface_method_or_null(
1618 const LinkInfo& link_info) {
1619 EXCEPTION_MARK;
1620 Method* method_result = linktime_resolve_interface_method(link_info, THREAD);
1621 if (HAS_PENDING_EXCEPTION) {
1622 CLEAR_PENDING_EXCEPTION;
1623 return nullptr;
1624 } else {
1625 return method_result;
1626 }
1627 }
1628
1629 Method* LinkResolver::linktime_resolve_virtual_method_or_null(
1630 const LinkInfo& link_info) {
1631 EXCEPTION_MARK;
1632 Method* method_result = linktime_resolve_virtual_method(link_info, THREAD);
1633 if (HAS_PENDING_EXCEPTION) {
1634 CLEAR_PENDING_EXCEPTION;
1635 return nullptr;
1636 } else {
1637 return method_result;
1638 }
1639 }
1640
1641 Method* LinkResolver::resolve_virtual_call_or_null(
1642 Klass* receiver_klass,
1643 const LinkInfo& link_info) {
1644 EXCEPTION_MARK;
1645 CallInfo info;
1646 resolve_virtual_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1647 if (HAS_PENDING_EXCEPTION) {
1648 CLEAR_PENDING_EXCEPTION;
1649 return nullptr;
1650 }
1651 return info.selected_method();
1652 }
1653
1654 Method* LinkResolver::resolve_interface_call_or_null(
1655 Klass* receiver_klass,
1656 const LinkInfo& link_info) {
1657 EXCEPTION_MARK;
1658 CallInfo info;
1659 resolve_interface_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1660 if (HAS_PENDING_EXCEPTION) {
1661 CLEAR_PENDING_EXCEPTION;
1662 return nullptr;
1663 }
1664 return info.selected_method();
1665 }
1666
1667 int LinkResolver::resolve_virtual_vtable_index(Klass* receiver_klass,
1668 const LinkInfo& link_info) {
1669 EXCEPTION_MARK;
1670 CallInfo info;
1671 resolve_virtual_call(info, Handle(), receiver_klass, link_info,
1672 /*check_null_or_abstract*/false, THREAD);
1673 if (HAS_PENDING_EXCEPTION) {
1674 CLEAR_PENDING_EXCEPTION;
1675 return Method::invalid_vtable_index;
1676 }
1677 return info.vtable_index();
1678 }
1679
1680 Method* LinkResolver::resolve_static_call_or_null(const LinkInfo& link_info) {
1681 EXCEPTION_MARK;
1682 CallInfo info;
1683 resolve_static_call(info, link_info, /*initialize_class*/false, THREAD);
1684 if (HAS_PENDING_EXCEPTION) {
1685 CLEAR_PENDING_EXCEPTION;
1686 return nullptr;
1687 }
1688 return info.selected_method();
1689 }
1690
1691 Method* LinkResolver::resolve_special_call_or_null(const LinkInfo& link_info) {
1692 EXCEPTION_MARK;
1693 CallInfo info;
1694 resolve_special_call(info, Handle(), link_info, THREAD);
1695 if (HAS_PENDING_EXCEPTION) {
1696 CLEAR_PENDING_EXCEPTION;
1697 return nullptr;
1698 }
1699 return info.selected_method();
1700 }
1701
1702
1703
1704 //------------------------------------------------------------------------------------------------------------------------
1705 // ConstantPool entries
1706
1707 void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) {
1708 switch (byte) {
1709 case Bytecodes::_invokestatic : resolve_invokestatic (result, pool, index, CHECK); break;
1710 case Bytecodes::_invokespecial : resolve_invokespecial (result, recv, pool, index, CHECK); break;
1711 case Bytecodes::_invokevirtual : resolve_invokevirtual (result, recv, pool, index, CHECK); break;
1712 case Bytecodes::_invokehandle : resolve_invokehandle (result, pool, index, CHECK); break;
1713 case Bytecodes::_invokedynamic : resolve_invokedynamic (result, pool, index, CHECK); break;
1714 case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break;
1715 default : break;
1716 }
1717 return;
1718 }
1719
1720 void LinkResolver::resolve_invoke(CallInfo& result, Handle& recv,
1721 const methodHandle& attached_method,
1722 Bytecodes::Code byte, TRAPS) {
1723 Klass* defc = attached_method->method_holder();
1724 Symbol* name = attached_method->name();
1725 Symbol* type = attached_method->signature();
1726 LinkInfo link_info(defc, name, type);
1727 switch(byte) {
1728 case Bytecodes::_invokevirtual:
1729 resolve_virtual_call(result, recv, recv->klass(), link_info,
1730 /*check_null_and_abstract=*/true, CHECK);
1731 break;
1732 case Bytecodes::_invokeinterface:
1733 resolve_interface_call(result, recv, recv->klass(), link_info,
1734 /*check_null_and_abstract=*/true, CHECK);
1735 break;
1736 case Bytecodes::_invokestatic:
1737 resolve_static_call(result, link_info, /*initialize_class=*/false, CHECK);
1738 break;
1739 case Bytecodes::_invokespecial:
1740 resolve_special_call(result, recv, link_info, CHECK);
1741 break;
1742 default:
1743 fatal("bad call: %s", Bytecodes::name(byte));
1744 break;
1745 }
1746 }
1747
1748 void LinkResolver::resolve_invokestatic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1749 LinkInfo link_info(pool, index, Bytecodes::_invokestatic, CHECK);
1750 resolve_static_call(result, link_info, /*initialize_class*/true, CHECK);
1751 }
1752
1753
1754 void LinkResolver::resolve_invokespecial(CallInfo& result, Handle recv,
1755 const constantPoolHandle& pool, int index, TRAPS) {
1756 LinkInfo link_info(pool, index, Bytecodes::_invokespecial, CHECK);
1757 resolve_special_call(result, recv, link_info, CHECK);
1758 }
1759
1760
1761 void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv,
1762 const constantPoolHandle& pool, int index,
1763 TRAPS) {
1764
1765 LinkInfo link_info(pool, index, Bytecodes::_invokevirtual, CHECK);
1766 Klass* recvrKlass = recv.is_null() ? (Klass*)nullptr : recv->klass();
1767 resolve_virtual_call(result, recv, recvrKlass, link_info, /*check_null_or_abstract*/true, CHECK);
1768 }
1769
1770
1771 void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, TRAPS) {
1772 LinkInfo link_info(pool, index, Bytecodes::_invokeinterface, CHECK);
1773 Klass* recvrKlass = recv.is_null() ? (Klass*)nullptr : recv->klass();
1774 resolve_interface_call(result, recv, recvrKlass, link_info, true, CHECK);
1775 }
1776
1777 bool LinkResolver::resolve_previously_linked_invokehandle(CallInfo& result, const LinkInfo& link_info, const constantPoolHandle& pool, int index, TRAPS) {
1778 ResolvedMethodEntry* method_entry = pool->cache()->resolved_method_entry_at(index);
1779 if (method_entry->method() != nullptr) {
1780 Klass* resolved_klass = link_info.resolved_klass();
1781 methodHandle method(THREAD, method_entry->method());
1782 Handle appendix(THREAD, pool->cache()->appendix_if_resolved(method_entry));
1783 result.set_handle(resolved_klass, method, appendix, CHECK_false);
1784 JFR_ONLY(Jfr::on_resolution(result, CHECK_false);)
1785 return true;
1786 } else {
1787 return false;
1788 }
1789 }
1790
1791 void LinkResolver::resolve_invokehandle(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1792 PerfTraceTimedEvent timer(ClassLoader::perf_resolve_invokehandle_time(),
1793 ClassLoader::perf_resolve_invokehandle_count(),
1794 THREAD->class_being_initialized() == nullptr);
1795
1796 LinkInfo link_info(pool, index, Bytecodes::_invokehandle, CHECK);
1797 { // Check if the call site has been bound already, and short circuit:
1798 bool is_done = resolve_previously_linked_invokehandle(result, link_info, pool, index, CHECK);
1799 if (is_done) return;
1800 }
1801 if (log_is_enabled(Info, methodhandles)) {
1802 ResourceMark rm(THREAD);
1803 log_info(methodhandles)("resolve_invokehandle %s %s", link_info.name()->as_C_string(),
1804 link_info.signature()->as_C_string());
1805 }
1806 resolve_handle_call(result, link_info, CHECK);
1807 }
1808
1809 void LinkResolver::resolve_handle_call(CallInfo& result,
1810 const LinkInfo& link_info,
1811 TRAPS) {
1812 // JSR 292: this must be an implicitly generated method MethodHandle.invokeExact(*...) or similar
1813 Klass* resolved_klass = link_info.resolved_klass();
1814 assert(resolved_klass == vmClasses::MethodHandle_klass() ||
1815 resolved_klass == vmClasses::VarHandle_klass(), "");
1816 assert(MethodHandles::is_signature_polymorphic_name(link_info.name()), "");
1817 Handle resolved_appendix;
1818 Method* m = lookup_polymorphic_method(link_info, &resolved_appendix, CHECK);
1819 methodHandle resolved_method(THREAD, m);
1820
1821 if (link_info.check_access()) {
1822 Symbol* name = link_info.name();
1823 vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name);
1824 if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) {
1825 // Check if method can be accessed by the referring class.
1826 // MH.linkTo* invocations are not rewritten to invokehandle.
1827 assert(iid == vmIntrinsicID::_invokeBasic, "%s", vmIntrinsics::name_at(iid));
1828
1829 Klass* current_klass = link_info.current_klass();
1830 assert(current_klass != nullptr , "current_klass should not be null");
1831 check_method_accessability(current_klass,
1832 resolved_klass,
1833 resolved_method->method_holder(),
1834 resolved_method,
1835 CHECK);
1836 } else {
1837 // Java code is free to arbitrarily link signature-polymorphic invokers.
1838 assert(iid == vmIntrinsics::_invokeGeneric, "not an invoker: %s", vmIntrinsics::name_at(iid));
1839 assert(MethodHandles::is_signature_polymorphic_public_name(resolved_klass, name), "not public");
1840 }
1841 }
1842 result.set_handle(resolved_klass, resolved_method, resolved_appendix, CHECK);
1843 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1844 }
1845
1846 void LinkResolver::resolve_invokedynamic(CallInfo& result, const constantPoolHandle& pool, int indy_index, TRAPS) {
1847 PerfTraceTimedEvent timer(ClassLoader::perf_resolve_invokedynamic_time(),
1848 ClassLoader::perf_resolve_invokedynamic_count(),
1849 THREAD->class_being_initialized() == nullptr);
1850 int pool_index = pool->resolved_indy_entry_at(indy_index)->constant_pool_index();
1851
1852 // Resolve the bootstrap specifier (BSM + optional arguments).
1853 BootstrapInfo bootstrap_specifier(pool, pool_index, indy_index);
1854
1855 // Check if CallSite has been bound already or failed already, and short circuit:
1856 {
1857 bool is_done = bootstrap_specifier.resolve_previously_linked_invokedynamic(result, CHECK);
1858 if (is_done) return;
1859 }
1860
1861 // The initial step in Call Site Specifier Resolution is to resolve the symbolic
1862 // reference to a method handle which will be the bootstrap method for a dynamic
1863 // call site. If resolution for the java.lang.invoke.MethodHandle for the bootstrap
1864 // method fails, then a MethodHandleInError is stored at the corresponding bootstrap
1865 // method's CP index for the CONSTANT_MethodHandle_info.
1866 // Any subsequent invokedynamic instruction which shares
1867 // this bootstrap method will encounter the resolution of MethodHandleInError.
1868
1869 resolve_dynamic_call(result, bootstrap_specifier, CHECK);
1870
1871 LogTarget(Debug, methodhandles, indy) lt_indy;
1872 if (lt_indy.is_enabled()) {
1873 LogStream ls(lt_indy);
1874 bootstrap_specifier.print_msg_on(&ls, "resolve_invokedynamic");
1875 }
1876
1877 // The returned linkage result is provisional up to the moment
1878 // the interpreter or runtime performs a serialized check of
1879 // the relevant ResolvedIndyEntry::method field. This is done by the caller
1880 // of this method, via CPC::set_dynamic_call, which uses
1881 // an ObjectLocker to do the final serialization of updates
1882 // to ResolvedIndyEntry state, including method.
1883
1884 // Log dynamic info to CDS classlist.
1885 ArchiveUtils::log_to_classlist(&bootstrap_specifier, CHECK);
1886 }
1887
1888 void LinkResolver::resolve_dynamic_call(CallInfo& result,
1889 BootstrapInfo& bootstrap_specifier,
1890 TRAPS) {
1891 // JSR 292: this must resolve to an implicitly generated method
1892 // such as MH.linkToCallSite(*...) or some other call-site shape.
1893 // The appendix argument is likely to be a freshly-created CallSite.
1894 // It may also be a MethodHandle from an unwrapped ConstantCallSite,
1895 // or any other reference. The resolved_method as well as the appendix
1896 // are both recorded together via CallInfo::set_handle.
1897 SystemDictionary::invoke_bootstrap_method(bootstrap_specifier, THREAD);
1898 Exceptions::wrap_dynamic_exception(/* is_indy */ true, THREAD);
1899
1900 if (HAS_PENDING_EXCEPTION) {
1901 if (!PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass())) {
1902 // Let any random low-level IE or SOE or OOME just bleed through.
1903 // Basically we pretend that the bootstrap method was never called,
1904 // if it fails this way: We neither record a successful linkage,
1905 // nor do we memorize a LE for posterity.
1906 return;
1907 }
1908 // JVMS 5.4.3 says: If an attempt by the Java Virtual Machine to resolve
1909 // a symbolic reference fails because an error is thrown that is an
1910 // instance of LinkageError (or a subclass), then subsequent attempts to
1911 // resolve the reference always fail with the same error that was thrown
1912 // as a result of the initial resolution attempt.
1913 bool recorded_res_status = bootstrap_specifier.save_and_throw_indy_exc(CHECK);
1914 if (!recorded_res_status) {
1915 // Another thread got here just before we did. So, either use the method
1916 // that it resolved or throw the LinkageError exception that it threw.
1917 bool is_done = bootstrap_specifier.resolve_previously_linked_invokedynamic(result, CHECK);
1918 if (is_done) return;
1919 }
1920 assert(bootstrap_specifier.pool()->resolved_indy_entry_at(bootstrap_specifier.indy_index())->resolution_failed(),
1921 "Resolution should have failed");
1922 }
1923
1924 bootstrap_specifier.resolve_newly_linked_invokedynamic(result, CHECK);
1925 // Exceptions::wrap_dynamic_exception not used because
1926 // set_handle doesn't throw linkage errors
1927 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1928 }
1929
1930 // Selected method is abstract.
1931 void LinkResolver::throw_abstract_method_error(const methodHandle& resolved_method,
1932 const methodHandle& selected_method,
1933 Klass *recv_klass, TRAPS) {
1934 Klass *resolved_klass = resolved_method->method_holder();
1935 ResourceMark rm(THREAD);
1936 stringStream ss;
1937
1938 if (recv_klass != nullptr) {
1939 ss.print("Receiver class %s does not define or inherit an "
1940 "implementation of the",
1941 recv_klass->external_name());
1942 } else {
1943 ss.print("Missing implementation of");
1944 }
1945
1946 assert(resolved_method.not_null(), "Sanity");
1947 ss.print(" resolved method '%s%s",
1948 resolved_method->is_abstract() ? "abstract " : "",
1949 resolved_method->is_private() ? "private " : "");
1950 resolved_method->signature()->print_as_signature_external_return_type(&ss);
1951 ss.print(" %s(", resolved_method->name()->as_C_string());
1952 resolved_method->signature()->print_as_signature_external_parameters(&ss);
1953 ss.print(")' of %s %s.",
1954 resolved_klass->external_kind(),
1955 resolved_klass->external_name());
1956
1957 if (selected_method.not_null() && !(resolved_method == selected_method)) {
1958 ss.print(" Selected method is '%s%s",
1959 selected_method->is_abstract() ? "abstract " : "",
1960 selected_method->is_private() ? "private " : "");
1961 selected_method->print_external_name(&ss);
1962 ss.print("'.");
1963 }
1964
1965 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1966 }