1 /*
2 * Copyright (c) 1997, 2024, 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 bool same_module = (base_klass->module() == ref_klass->module());
327 if (msg == nullptr) {
328 Exceptions::fthrow(
329 THREAD_AND_LOCATION,
330 vmSymbols::java_lang_IllegalAccessError(),
331 "failed to access class %s from class %s (%s%s%s)",
332 base_klass->external_name(),
333 ref_klass->external_name(),
334 (same_module) ? base_klass->joint_in_module_of_loader(ref_klass) : base_klass->class_in_module_of_loader(),
335 (same_module) ? "" : "; ",
336 (same_module) ? "" : ref_klass->class_in_module_of_loader());
337 } else {
338 // Use module specific message returned by verify_class_access_msg().
339 Exceptions::fthrow(
340 THREAD_AND_LOCATION,
341 vmSymbols::java_lang_IllegalAccessError(),
342 "%s", msg);
343 }
344 }
345 }
346
347 //------------------------------------------------------------------------------------------------------------------------
348 // Method resolution
349 //
350 // According to JVM spec. $5.4.3c & $5.4.3d
351
352 // Look up method in klasses, including static methods
353 // Then look up local default methods
354 Method* LinkResolver::lookup_method_in_klasses(const LinkInfo& link_info,
355 bool checkpolymorphism,
356 bool in_imethod_resolve) {
357 NoSafepointVerifier nsv; // Method* returned may not be reclaimed
358
359 Klass* klass = link_info.resolved_klass();
360 Symbol* name = link_info.name();
361 Symbol* signature = link_info.signature();
362
363 // Ignore overpasses so statics can be found during resolution
364 Method* result = klass->uncached_lookup_method(name, signature, Klass::OverpassLookupMode::skip);
365
366 if (klass->is_array_klass()) {
367 // Only consider klass and super klass for arrays
368 return result;
369 }
370
371 InstanceKlass* ik = InstanceKlass::cast(klass);
372
373 // JDK 8, JVMS 5.4.3.4: Interface method resolution should
374 // ignore static and non-public methods of java.lang.Object,
375 // like clone and finalize.
376 if (in_imethod_resolve &&
377 result != nullptr &&
378 ik->is_interface() &&
379 (result->is_static() || !result->is_public()) &&
380 result->method_holder() == vmClasses::Object_klass()) {
381 result = nullptr;
382 }
383
384 // Before considering default methods, check for an overpass in the
385 // current class if a method has not been found.
386 if (result == nullptr) {
387 result = ik->find_method(name, signature);
388 }
389
390 if (result == nullptr) {
391 Array<Method*>* default_methods = ik->default_methods();
392 if (default_methods != nullptr) {
393 result = InstanceKlass::find_method(default_methods, name, signature);
394 }
395 }
396
397 if (checkpolymorphism && result != nullptr) {
398 vmIntrinsics::ID iid = result->intrinsic_id();
399 if (MethodHandles::is_signature_polymorphic(iid)) {
400 // Do not link directly to these. The VM must produce a synthetic one using lookup_polymorphic_method.
401 return nullptr;
402 }
403 }
404 return result;
405 }
406
407 // returns first instance method
408 // Looks up method in classes, then looks up local default methods
409 Method* LinkResolver::lookup_instance_method_in_klasses(Klass* klass,
410 Symbol* name,
411 Symbol* signature,
412 Klass::PrivateLookupMode private_mode) {
413 Method* result = klass->uncached_lookup_method(name, signature, Klass::OverpassLookupMode::find, private_mode);
414
415 while (result != nullptr && result->is_static() && result->method_holder()->super() != nullptr) {
416 Klass* super_klass = result->method_holder()->super();
417 result = super_klass->uncached_lookup_method(name, signature, Klass::OverpassLookupMode::find, private_mode);
418 }
419
420 if (klass->is_array_klass()) {
421 // Only consider klass and super klass for arrays
422 return result;
423 }
424
425 if (result == nullptr) {
426 Array<Method*>* default_methods = InstanceKlass::cast(klass)->default_methods();
427 if (default_methods != nullptr) {
428 result = InstanceKlass::find_method(default_methods, name, signature);
429 assert(result == nullptr || !result->is_static(), "static defaults not allowed");
430 }
431 }
432 return result;
433 }
434
435 int LinkResolver::vtable_index_of_interface_method(Klass* klass, const methodHandle& resolved_method) {
436 InstanceKlass* ik = InstanceKlass::cast(klass);
437 return ik->vtable_index_of_interface_method(resolved_method());
438 }
439
440 Method* LinkResolver::lookup_method_in_interfaces(const LinkInfo& cp_info) {
441 InstanceKlass *ik = InstanceKlass::cast(cp_info.resolved_klass());
442
443 // Specify 'true' in order to skip default methods when searching the
444 // interfaces. Function lookup_method_in_klasses() already looked for
445 // the method in the default methods table.
446 return ik->lookup_method_in_all_interfaces(cp_info.name(), cp_info.signature(), Klass::DefaultsLookupMode::skip);
447 }
448
449 Method* LinkResolver::lookup_polymorphic_method(const LinkInfo& link_info,
450 Handle *appendix_result_or_null,
451 TRAPS) {
452 ResourceMark rm(THREAD);
453 Klass* klass = link_info.resolved_klass();
454 Symbol* name = link_info.name();
455 Symbol* full_signature = link_info.signature();
456 LogTarget(Info, methodhandles) lt_mh;
457
458 vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name);
459 log_info(methodhandles)("lookup_polymorphic_method iid=%s %s.%s%s",
460 vmIntrinsics::name_at(iid), klass->external_name(),
461 name->as_C_string(), full_signature->as_C_string());
462 if ((klass == vmClasses::MethodHandle_klass() ||
463 klass == vmClasses::VarHandle_klass()) &&
464 iid != vmIntrinsics::_none) {
465 if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) {
466 // Most of these do not need an up-call to Java to resolve, so can be done anywhere.
467 // Do not erase last argument type (MemberName) if it is a static linkTo method.
468 bool keep_last_arg = MethodHandles::is_signature_polymorphic_static(iid);
469 TempNewSymbol basic_signature =
470 MethodHandles::lookup_basic_type_signature(full_signature, keep_last_arg);
471 log_info(methodhandles)("lookup_polymorphic_method %s %s => basic %s",
472 name->as_C_string(),
473 full_signature->as_C_string(),
474 basic_signature->as_C_string());
475 Method* result = SystemDictionary::find_method_handle_intrinsic(iid,
476 basic_signature,
477 CHECK_NULL);
478 if (result != nullptr) {
479 assert(result->is_method_handle_intrinsic(), "MH.invokeBasic or MH.linkTo* intrinsic");
480 assert(result->intrinsic_id() != vmIntrinsics::_invokeGeneric, "wrong place to find this");
481 assert(basic_signature == result->signature(), "predict the result signature");
482 if (lt_mh.is_enabled()) {
483 LogStream ls(lt_mh);
484 ls.print("lookup_polymorphic_method => intrinsic ");
485 result->print_on(&ls);
486 }
487 }
488 return result;
489 } else if (iid == vmIntrinsics::_invokeGeneric
490 && THREAD->can_call_java()
491 && appendix_result_or_null != nullptr) {
492 // This is a method with type-checking semantics.
493 // We will ask Java code to spin an adapter method for it.
494 if (!MethodHandles::enabled()) {
495 // Make sure the Java part of the runtime has been booted up.
496 Klass* natives = vmClasses::MethodHandleNatives_klass();
497 if (natives == nullptr || InstanceKlass::cast(natives)->is_not_initialized()) {
498 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_invoke_MethodHandleNatives(),
499 Handle(),
500 Handle(),
501 true,
502 CHECK_NULL);
503 }
504 }
505
506 Handle appendix;
507 Method* result = SystemDictionary::find_method_handle_invoker(klass,
508 name,
509 full_signature,
510 link_info.current_klass(),
511 &appendix,
512 CHECK_NULL);
513 if (lt_mh.is_enabled()) {
514 LogStream ls(lt_mh);
515 ls.print("lookup_polymorphic_method => (via Java) ");
516 result->print_on(&ls);
517 ls.print(" lookup_polymorphic_method => appendix = ");
518 appendix.is_null() ? ls.print_cr("(none)") : appendix->print_on(&ls);
519 }
520 if (result != nullptr) {
521 #ifdef ASSERT
522 ResourceMark rm(THREAD);
523
524 TempNewSymbol basic_signature =
525 MethodHandles::lookup_basic_type_signature(full_signature);
526 int actual_size_of_params = result->size_of_parameters();
527 int expected_size_of_params = ArgumentSizeComputer(basic_signature).size();
528 // +1 for MethodHandle.this, +1 for trailing MethodType
529 if (!MethodHandles::is_signature_polymorphic_static(iid)) expected_size_of_params += 1;
530 if (appendix.not_null()) expected_size_of_params += 1;
531 if (actual_size_of_params != expected_size_of_params) {
532 tty->print_cr("*** basic_signature=%s", basic_signature->as_C_string());
533 tty->print_cr("*** result for %s: ", vmIntrinsics::name_at(iid));
534 result->print();
535 }
536 assert(actual_size_of_params == expected_size_of_params,
537 "%d != %d", actual_size_of_params, expected_size_of_params);
538 #endif //ASSERT
539
540 assert(appendix_result_or_null != nullptr, "");
541 (*appendix_result_or_null) = appendix;
542 }
543 return result;
544 }
545 }
546 return nullptr;
547 }
548
549 static void print_nest_host_error_on(stringStream* ss, Klass* ref_klass, Klass* sel_klass) {
550 assert(ref_klass->is_instance_klass(), "must be");
551 assert(sel_klass->is_instance_klass(), "must be");
552 InstanceKlass* ref_ik = InstanceKlass::cast(ref_klass);
553 InstanceKlass* sel_ik = InstanceKlass::cast(sel_klass);
554 const char* nest_host_error_1 = ref_ik->nest_host_error();
555 const char* nest_host_error_2 = sel_ik->nest_host_error();
556 if (nest_host_error_1 != nullptr || nest_host_error_2 != nullptr) {
557 ss->print(", (%s%s%s)",
558 (nest_host_error_1 != nullptr) ? nest_host_error_1 : "",
559 (nest_host_error_1 != nullptr && nest_host_error_2 != nullptr) ? ", " : "",
560 (nest_host_error_2 != nullptr) ? nest_host_error_2 : "");
561 }
562 }
563
564 void LinkResolver::check_method_accessability(Klass* ref_klass,
565 Klass* resolved_klass,
566 Klass* sel_klass,
567 const methodHandle& sel_method,
568 TRAPS) {
569
570 AccessFlags flags = sel_method->access_flags();
571
572 // Special case: arrays always override "clone". JVMS 2.15.
573 // If the resolved klass is an array class, and the declaring class
574 // is java.lang.Object and the method is "clone", set the flags
575 // to public.
576 //
577 // We'll check for the method name first, as that's most likely
578 // to be false (so we'll short-circuit out of these tests).
579 if (sel_method->name() == vmSymbols::clone_name() &&
580 sel_klass == vmClasses::Object_klass() &&
581 resolved_klass->is_array_klass()) {
582 // We need to change "protected" to "public".
583 assert(flags.is_protected(), "clone not protected?");
584 jint new_flags = flags.as_int();
585 new_flags = new_flags & (~JVM_ACC_PROTECTED);
586 new_flags = new_flags | JVM_ACC_PUBLIC;
587 flags.set_flags(new_flags);
588 }
589 // assert(extra_arg_result_or_null != nullptr, "must be able to return extra argument");
590
591 bool can_access = Reflection::verify_member_access(ref_klass,
592 resolved_klass,
593 sel_klass,
594 flags,
595 true, false, CHECK);
596 // Any existing exceptions that may have been thrown
597 // have been allowed to propagate.
598 if (!can_access) {
599 ResourceMark rm(THREAD);
600 stringStream ss;
601 bool same_module = (sel_klass->module() == ref_klass->module());
602 ss.print("class %s tried to access %s%s%smethod '%s' (%s%s%s)",
603 ref_klass->external_name(),
604 sel_method->is_abstract() ? "abstract " : "",
605 sel_method->is_protected() ? "protected " : "",
606 sel_method->is_private() ? "private " : "",
607 sel_method->external_name(),
608 (same_module) ? ref_klass->joint_in_module_of_loader(sel_klass) : ref_klass->class_in_module_of_loader(),
609 (same_module) ? "" : "; ",
610 (same_module) ? "" : sel_klass->class_in_module_of_loader()
611 );
612
613 // For private access see if there was a problem with nest host
614 // resolution, and if so report that as part of the message.
615 if (sel_method->is_private()) {
616 print_nest_host_error_on(&ss, ref_klass, sel_klass);
617 }
618
619 Exceptions::fthrow(THREAD_AND_LOCATION,
620 vmSymbols::java_lang_IllegalAccessError(),
621 "%s",
622 ss.as_string()
623 );
624 return;
625 }
626 }
627
628 void LinkResolver::resolve_continuation_enter(CallInfo& callinfo, TRAPS) {
629 Klass* resolved_klass = vmClasses::Continuation_klass();
630 Symbol* method_name = vmSymbols::enter_name();
631 Symbol* method_signature = vmSymbols::continuationEnter_signature();
632 Klass* current_klass = resolved_klass;
633 LinkInfo link_info(resolved_klass, method_name, method_signature, current_klass);
634 Method* resolved_method = resolve_method(link_info, Bytecodes::_invokestatic, CHECK);
635 callinfo.set_static(resolved_klass, methodHandle(THREAD, resolved_method), CHECK);
636 }
637
638 Method* LinkResolver::resolve_method_statically(Bytecodes::Code code,
639 const constantPoolHandle& pool, int index, TRAPS) {
640 // This method is used only
641 // (1) in C2 from InlineTree::ok_to_inline (via ciMethod::check_call),
642 // and
643 // (2) in Bytecode_invoke::static_target
644 // It appears to fail when applied to an invokeinterface call site.
645 // FIXME: Remove this method and ciMethod::check_call; refactor to use the other LinkResolver entry points.
646 // resolve klass
647 if (code == Bytecodes::_invokedynamic) {
648 Klass* resolved_klass = vmClasses::MethodHandle_klass();
649 Symbol* method_name = vmSymbols::invoke_name();
650 Symbol* method_signature = pool->signature_ref_at(index, code);
651 Klass* current_klass = pool->pool_holder();
652 LinkInfo link_info(resolved_klass, method_name, method_signature, current_klass);
653 return resolve_method(link_info, code, THREAD);
654 }
655
656 LinkInfo link_info(pool, index, methodHandle(), code, CHECK_NULL);
657 Klass* resolved_klass = link_info.resolved_klass();
658
659 if (pool->has_preresolution()
660 || ((resolved_klass == vmClasses::MethodHandle_klass() || resolved_klass == vmClasses::VarHandle_klass()) &&
661 MethodHandles::is_signature_polymorphic_name(resolved_klass, link_info.name()))) {
662 Method* result = ConstantPool::method_at_if_loaded(pool, index);
663 if (result != nullptr) {
664 return result;
665 }
666 }
667
668 if (code == Bytecodes::_invokeinterface) {
669 return resolve_interface_method(link_info, code, THREAD);
670 } else if (code == Bytecodes::_invokevirtual) {
671 return resolve_method(link_info, code, THREAD);
672 } else if (!resolved_klass->is_interface()) {
673 return resolve_method(link_info, code, THREAD);
674 } else {
675 return resolve_interface_method(link_info, code, THREAD);
676 }
677 }
678
679 // Check and print a loader constraint violation message for method or interface method
680 void LinkResolver::check_method_loader_constraints(const LinkInfo& link_info,
681 const methodHandle& resolved_method,
682 const char* method_type, TRAPS) {
683 Handle current_loader(THREAD, link_info.current_klass()->class_loader());
684 Handle resolved_loader(THREAD, resolved_method->method_holder()->class_loader());
685
686 ResourceMark rm(THREAD);
687 Symbol* failed_type_symbol =
688 SystemDictionary::check_signature_loaders(link_info.signature(),
689 /*klass_being_linked*/ nullptr, // We are not linking class
690 current_loader,
691 resolved_loader, true);
692 if (failed_type_symbol != nullptr) {
693 Klass* current_class = link_info.current_klass();
694 ClassLoaderData* current_loader_data = current_class->class_loader_data();
695 assert(current_loader_data != nullptr, "current class has no class loader data");
696 Klass* resolved_method_class = resolved_method->method_holder();
697 ClassLoaderData* target_loader_data = resolved_method_class->class_loader_data();
698 assert(target_loader_data != nullptr, "resolved method's class has no class loader data");
699
700 stringStream ss;
701 ss.print("loader constraint violation: when resolving %s '", method_type);
702 Method::print_external_name(&ss, link_info.resolved_klass(), link_info.name(), link_info.signature());
703 ss.print("' the class loader %s of the current class, %s,"
704 " and the class loader %s for the method's defining class, %s, have"
705 " different Class objects for the type %s used in the signature (%s; %s)",
706 current_loader_data->loader_name_and_id(),
707 current_class->name()->as_C_string(),
708 target_loader_data->loader_name_and_id(),
709 resolved_method_class->name()->as_C_string(),
710 failed_type_symbol->as_C_string(),
711 current_class->class_in_module_of_loader(false, true),
712 resolved_method_class->class_in_module_of_loader(false, true));
713 THROW_MSG(vmSymbols::java_lang_LinkageError(), ss.as_string());
714 }
715 }
716
717 void LinkResolver::check_field_loader_constraints(Symbol* field, Symbol* sig,
718 Klass* current_klass,
719 Klass* sel_klass, TRAPS) {
720 Handle ref_loader(THREAD, current_klass->class_loader());
721 Handle sel_loader(THREAD, sel_klass->class_loader());
722
723 ResourceMark rm(THREAD); // needed for check_signature_loaders
724 Symbol* failed_type_symbol =
725 SystemDictionary::check_signature_loaders(sig,
726 /*klass_being_linked*/ nullptr, // We are not linking class
727 ref_loader, sel_loader,
728 false);
729 if (failed_type_symbol != nullptr) {
730 stringStream ss;
731 const char* failed_type_name = failed_type_symbol->as_klass_external_name();
732
733 ss.print("loader constraint violation: when resolving field \"%s\" of type %s, "
734 "the class loader %s of the current class, %s, "
735 "and the class loader %s for the field's defining %s, %s, "
736 "have different Class objects for type %s (%s; %s)",
737 field->as_C_string(),
738 failed_type_name,
739 current_klass->class_loader_data()->loader_name_and_id(),
740 current_klass->external_name(),
741 sel_klass->class_loader_data()->loader_name_and_id(),
742 sel_klass->external_kind(),
743 sel_klass->external_name(),
744 failed_type_name,
745 current_klass->class_in_module_of_loader(false, true),
746 sel_klass->class_in_module_of_loader(false, true));
747 THROW_MSG(vmSymbols::java_lang_LinkageError(), ss.as_string());
748 }
749 }
750
751 Method* LinkResolver::resolve_method(const LinkInfo& link_info,
752 Bytecodes::Code code, TRAPS) {
753
754 Handle nested_exception;
755 Klass* resolved_klass = link_info.resolved_klass();
756
757 // 1. For invokevirtual, cannot call an interface method
758 if (code == Bytecodes::_invokevirtual && resolved_klass->is_interface()) {
759 ResourceMark rm(THREAD);
760 char buf[200];
761 jio_snprintf(buf, sizeof(buf), "Found interface %s, but class was expected",
762 resolved_klass->external_name());
763 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
764 }
765
766 // 2. check constant pool tag for called method - must be JVM_CONSTANT_Methodref
767 if (!link_info.tag().is_invalid() && !link_info.tag().is_method()) {
768 ResourceMark rm(THREAD);
769 stringStream ss;
770 ss.print("Method '");
771 Method::print_external_name(&ss, link_info.resolved_klass(), link_info.name(), link_info.signature());
772 ss.print("' must be Methodref constant");
773 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
774 }
775
776 // 3. lookup method in resolved klass and its super klasses
777 methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, true, false));
778
779 // 4. lookup method in all the interfaces implemented by the resolved klass
780 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) { // not found in the class hierarchy
781 resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info));
782
783 if (resolved_method.is_null()) {
784 // JSR 292: see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc
785 Method* method = lookup_polymorphic_method(link_info, (Handle*)nullptr, THREAD);
786 resolved_method = methodHandle(THREAD, method);
787 if (HAS_PENDING_EXCEPTION) {
788 nested_exception = Handle(THREAD, PENDING_EXCEPTION);
789 CLEAR_PENDING_EXCEPTION;
790 }
791 }
792 }
793
794 // 5. method lookup failed
795 if (resolved_method.is_null()) {
796 ResourceMark rm(THREAD);
797 stringStream ss;
798 ss.print("'");
799 Method::print_external_name(&ss, resolved_klass, link_info.name(), link_info.signature());
800 ss.print("'");
801 THROW_MSG_CAUSE_(vmSymbols::java_lang_NoSuchMethodError(),
802 ss.as_string(), nested_exception, nullptr);
803 }
804
805 // 6. access checks, access checking may be turned off when calling from within the VM.
806 Klass* current_klass = link_info.current_klass();
807 if (link_info.check_access()) {
808 assert(current_klass != nullptr , "current_klass should not be null");
809
810 // check if method can be accessed by the referring class
811 check_method_accessability(current_klass,
812 resolved_klass,
813 resolved_method->method_holder(),
814 resolved_method,
815 CHECK_NULL);
816 }
817 if (link_info.check_loader_constraints()) {
818 // check loader constraints
819 check_method_loader_constraints(link_info, resolved_method, "method", CHECK_NULL);
820 }
821
822 return resolved_method();
823 }
824
825 static void trace_method_resolution(const char* prefix,
826 Klass* klass,
827 Klass* resolved_klass,
828 Method* method,
829 bool logitables,
830 int index = -1) {
831 #ifndef PRODUCT
832 ResourceMark rm;
833 Log(itables) logi;
834 LogStream lsi(logi.trace());
835 Log(vtables) logv;
836 LogStream lsv(logv.trace());
837 outputStream* st;
838 if (logitables) {
839 st = &lsi;
840 } else {
841 st = &lsv;
842 }
843 st->print("%s%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ",
844 prefix,
845 (klass == nullptr ? "<null>" : klass->internal_name()),
846 resolved_klass->internal_name(),
847 Method::name_and_sig_as_C_string(resolved_klass,
848 method->name(),
849 method->signature()),
850 method->method_holder()->internal_name());
851 method->print_linkage_flags(st);
852 if (index != -1) {
853 st->print("vtable_index:%d", index);
854 }
855 st->cr();
856 #endif // PRODUCT
857 }
858
859 // Do linktime resolution of a method in the interface within the context of the specified bytecode.
860 Method* LinkResolver::resolve_interface_method(const LinkInfo& link_info, Bytecodes::Code code, TRAPS) {
861
862 Klass* resolved_klass = link_info.resolved_klass();
863
864 // check if klass is interface
865 if (!resolved_klass->is_interface()) {
866 ResourceMark rm(THREAD);
867 char buf[200];
868 jio_snprintf(buf, sizeof(buf), "Found class %s, but interface was expected", resolved_klass->external_name());
869 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
870 }
871
872 // check constant pool tag for called method - must be JVM_CONSTANT_InterfaceMethodref
873 if (!link_info.tag().is_invalid() && !link_info.tag().is_interface_method()) {
874 ResourceMark rm(THREAD);
875 stringStream ss;
876 ss.print("Method '");
877 Method::print_external_name(&ss, link_info.resolved_klass(), link_info.name(), link_info.signature());
878 ss.print("' must be InterfaceMethodref constant");
879 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
880 }
881
882 // lookup method in this interface or its super, java.lang.Object
883 // JDK8: also look for static methods
884 methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, false, true));
885
886 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) {
887 // lookup method in all the super-interfaces
888 resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info));
889 }
890
891 if (resolved_method.is_null()) {
892 // no method found
893 ResourceMark rm(THREAD);
894 stringStream ss;
895 ss.print("'");
896 Method::print_external_name(&ss, resolved_klass, link_info.name(), link_info.signature());
897 ss.print("'");
898 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), ss.as_string());
899 }
900
901 if (link_info.check_access()) {
902 // JDK8 adds non-public interface methods, and accessability check requirement
903 Klass* current_klass = link_info.current_klass();
904
905 assert(current_klass != nullptr , "current_klass should not be null");
906
907 // check if method can be accessed by the referring class
908 check_method_accessability(current_klass,
909 resolved_klass,
910 resolved_method->method_holder(),
911 resolved_method,
912 CHECK_NULL);
913 }
914 if (link_info.check_loader_constraints()) {
915 check_method_loader_constraints(link_info, resolved_method, "interface method", CHECK_NULL);
916 }
917
918 if (code != Bytecodes::_invokestatic && resolved_method->is_static()) {
919 ResourceMark rm(THREAD);
920 stringStream ss;
921 ss.print("Expected instance not static method '");
922 Method::print_external_name(&ss, resolved_klass,
923 resolved_method->name(), resolved_method->signature());
924 ss.print("'");
925 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
926 }
927
928 if (log_develop_is_enabled(Trace, itables)) {
929 char buf[200];
930 jio_snprintf(buf, sizeof(buf), "%s resolved interface method: caller-class:",
931 Bytecodes::name(code));
932 trace_method_resolution(buf, link_info.current_klass(), resolved_klass, resolved_method(), true);
933 }
934
935 return resolved_method();
936 }
937
938 //------------------------------------------------------------------------------------------------------------------------
939 // Field resolution
940
941 void LinkResolver::check_field_accessability(Klass* ref_klass,
942 Klass* resolved_klass,
943 Klass* sel_klass,
944 const fieldDescriptor& fd,
945 TRAPS) {
946 bool can_access = Reflection::verify_member_access(ref_klass,
947 resolved_klass,
948 sel_klass,
949 fd.access_flags(),
950 true, false, CHECK);
951 // Any existing exceptions that may have been thrown, for example LinkageErrors
952 // from nest-host resolution, have been allowed to propagate.
953 if (!can_access) {
954 bool same_module = (sel_klass->module() == ref_klass->module());
955 ResourceMark rm(THREAD);
956 stringStream ss;
957 ss.print("class %s tried to access %s%sfield %s.%s (%s%s%s)",
958 ref_klass->external_name(),
959 fd.is_protected() ? "protected " : "",
960 fd.is_private() ? "private " : "",
961 sel_klass->external_name(),
962 fd.name()->as_C_string(),
963 (same_module) ? ref_klass->joint_in_module_of_loader(sel_klass) : ref_klass->class_in_module_of_loader(),
964 (same_module) ? "" : "; ",
965 (same_module) ? "" : sel_klass->class_in_module_of_loader()
966 );
967 // For private access see if there was a problem with nest host
968 // resolution, and if so report that as part of the message.
969 if (fd.is_private()) {
970 print_nest_host_error_on(&ss, ref_klass, sel_klass);
971 }
972 Exceptions::fthrow(THREAD_AND_LOCATION,
973 vmSymbols::java_lang_IllegalAccessError(),
974 "%s",
975 ss.as_string()
976 );
977 return;
978 }
979 }
980
981 void LinkResolver::resolve_field_access(fieldDescriptor& fd,
982 const constantPoolHandle& pool,
983 int index,
984 const methodHandle& method,
985 Bytecodes::Code byte,
986 bool initialize_class, TRAPS) {
987 LinkInfo link_info(pool, index, method, byte, CHECK);
988 resolve_field(fd, link_info, byte, initialize_class, CHECK);
989 }
990
991 void LinkResolver::resolve_field(fieldDescriptor& fd,
992 const LinkInfo& link_info,
993 Bytecodes::Code byte, bool initialize_class,
994 TRAPS) {
995 assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic ||
996 byte == Bytecodes::_getfield || byte == Bytecodes::_putfield ||
997 byte == Bytecodes::_nofast_getfield || byte == Bytecodes::_nofast_putfield ||
998 (byte == Bytecodes::_nop && !link_info.check_access()), "bad field access bytecode");
999
1000 bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic);
1001 bool is_put = (byte == Bytecodes::_putfield || byte == Bytecodes::_putstatic || byte == Bytecodes::_nofast_putfield);
1002 // Check if there's a resolved klass containing the field
1003 Klass* resolved_klass = link_info.resolved_klass();
1004 Symbol* field = link_info.name();
1005 Symbol* sig = link_info.signature();
1006
1007 // Resolve instance field
1008 Klass* sel_klass = resolved_klass->find_field(field, sig, &fd);
1009 // check if field exists; i.e., if a klass containing the field def has been selected
1010 if (sel_klass == nullptr) {
1011 ResourceMark rm(THREAD);
1012 stringStream ss;
1013 ss.print("Class %s does not have member field '", resolved_klass->external_name());
1014 sig->print_as_field_external_type(&ss);
1015 ss.print(" %s'", field->as_C_string());
1016 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), ss.as_string());
1017 }
1018
1019 // Access checking may be turned off when calling from within the VM.
1020 Klass* current_klass = link_info.current_klass();
1021 if (link_info.check_access()) {
1022
1023 // check access
1024 check_field_accessability(current_klass, resolved_klass, sel_klass, fd, CHECK);
1025
1026 // check for errors
1027 if (is_static != fd.is_static()) {
1028 ResourceMark rm(THREAD);
1029 char msg[200];
1030 jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string());
1031 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg);
1032 }
1033
1034 // A final field can be modified only
1035 // (1) by methods declared in the class declaring the field and
1036 // (2) by the <clinit> method (in case of a static field)
1037 // or by the <init> method (in case of an instance field).
1038 if (is_put && fd.access_flags().is_final()) {
1039
1040 if (sel_klass != current_klass) {
1041 ResourceMark rm(THREAD);
1042 stringStream ss;
1043 ss.print("Update to %s final field %s.%s attempted from a different class (%s) than the field's declaring class",
1044 is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(),
1045 current_klass->external_name());
1046 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
1047 }
1048
1049 if (fd.constants()->pool_holder()->major_version() >= 53) {
1050 Method* m = link_info.current_method();
1051 assert(m != nullptr, "information about the current method must be available for 'put' bytecodes");
1052 bool is_initialized_static_final_update = (byte == Bytecodes::_putstatic &&
1053 fd.is_static() &&
1054 !m->is_static_initializer());
1055 bool is_initialized_instance_final_update = ((byte == Bytecodes::_putfield || byte == Bytecodes::_nofast_putfield) &&
1056 !fd.is_static() &&
1057 !m->is_object_initializer());
1058
1059 if (is_initialized_static_final_update || is_initialized_instance_final_update) {
1060 ResourceMark rm(THREAD);
1061 stringStream ss;
1062 ss.print("Update to %s final field %s.%s attempted from a different method (%s) than the initializer method %s ",
1063 is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(),
1064 m->name()->as_C_string(),
1065 is_static ? "<clinit>" : "<init>");
1066 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
1067 }
1068 }
1069 }
1070
1071 // initialize resolved_klass if necessary
1072 // note 1: the klass which declared the field must be initialized (i.e, sel_klass)
1073 // according to the newest JVM spec (5.5, p.170) - was bug (gri 7/28/99)
1074 //
1075 // note 2: we don't want to force initialization if we are just checking
1076 // if the field access is legal; e.g., during compilation
1077 if (is_static && initialize_class) {
1078 sel_klass->initialize(CHECK);
1079 }
1080 }
1081
1082 if (link_info.check_loader_constraints() && (sel_klass != current_klass) && (current_klass != nullptr)) {
1083 check_field_loader_constraints(field, sig, current_klass, sel_klass, CHECK);
1084 }
1085
1086 // return information. note that the klass is set to the actual klass containing the
1087 // field, otherwise access of static fields in superclasses will not work.
1088 }
1089
1090
1091 //------------------------------------------------------------------------------------------------------------------------
1092 // Invoke resolution
1093 //
1094 // Naming conventions:
1095 //
1096 // resolved_method the specified method (i.e., static receiver specified via constant pool index)
1097 // sel_method the selected method (selected via run-time lookup; e.g., based on dynamic receiver class)
1098 // resolved_klass the specified klass (i.e., specified via constant pool index)
1099 // recv_klass the receiver klass
1100
1101
1102 void LinkResolver::resolve_static_call(CallInfo& result,
1103 const LinkInfo& link_info,
1104 bool initialize_class, TRAPS) {
1105 Method* resolved_method = linktime_resolve_static_method(link_info, CHECK);
1106
1107 // The resolved class can change as a result of this resolution.
1108 Klass* resolved_klass = resolved_method->method_holder();
1109
1110 // Initialize klass (this should only happen if everything is ok)
1111 if (initialize_class && resolved_klass->should_be_initialized()) {
1112 resolved_klass->initialize(CHECK);
1113 // Use updated LinkInfo to reresolve with resolved method holder
1114 LinkInfo new_info(resolved_klass, link_info.name(), link_info.signature(),
1115 link_info.current_klass(),
1116 link_info.check_access() ? LinkInfo::AccessCheck::required : LinkInfo::AccessCheck::skip,
1117 link_info.check_loader_constraints() ? LinkInfo::LoaderConstraintCheck::required : LinkInfo::LoaderConstraintCheck::skip);
1118 resolved_method = linktime_resolve_static_method(new_info, CHECK);
1119 }
1120
1121 // setup result
1122 result.set_static(resolved_klass, methodHandle(THREAD, resolved_method), CHECK);
1123 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1124 }
1125
1126 // throws linktime exceptions
1127 Method* LinkResolver::linktime_resolve_static_method(const LinkInfo& link_info, TRAPS) {
1128
1129 Klass* resolved_klass = link_info.resolved_klass();
1130 Method* resolved_method;
1131 if (!resolved_klass->is_interface()) {
1132 resolved_method = resolve_method(link_info, Bytecodes::_invokestatic, CHECK_NULL);
1133 } else {
1134 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokestatic, CHECK_NULL);
1135 }
1136 assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier");
1137
1138 // check if static
1139 if (!resolved_method->is_static()) {
1140 ResourceMark rm(THREAD);
1141 stringStream ss;
1142 ss.print("Expected static method '");
1143 resolved_method->print_external_name(&ss);
1144 ss.print("'");
1145 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1146 }
1147 return resolved_method;
1148 }
1149
1150
1151 void LinkResolver::resolve_special_call(CallInfo& result,
1152 Handle recv,
1153 const LinkInfo& link_info,
1154 TRAPS) {
1155 Method* resolved_method = linktime_resolve_special_method(link_info, CHECK);
1156 runtime_resolve_special_method(result, link_info, methodHandle(THREAD, resolved_method), recv, CHECK);
1157 }
1158
1159 void LinkResolver::cds_resolve_special_call(CallInfo& result, const LinkInfo& link_info, TRAPS) {
1160 resolve_special_call(result, Handle(), link_info, CHECK);
1161 }
1162
1163 // throws linktime exceptions
1164 Method* LinkResolver::linktime_resolve_special_method(const LinkInfo& link_info, TRAPS) {
1165
1166 // Invokespecial is called for multiple special reasons:
1167 // <init>
1168 // local private method invocation, for classes and interfaces
1169 // superclass.method, which can also resolve to a default method
1170 // and the selected method is recalculated relative to the direct superclass
1171 // superinterface.method, which explicitly does not check shadowing
1172 Klass* resolved_klass = link_info.resolved_klass();
1173 Method* resolved_method = nullptr;
1174
1175 if (!resolved_klass->is_interface()) {
1176 resolved_method = resolve_method(link_info, Bytecodes::_invokespecial, CHECK_NULL);
1177 } else {
1178 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokespecial, CHECK_NULL);
1179 }
1180
1181 // check if method name is <init>, that it is found in same klass as static type
1182 if (resolved_method->name() == vmSymbols::object_initializer_name() &&
1183 resolved_method->method_holder() != resolved_klass) {
1184 ResourceMark rm(THREAD);
1185 stringStream ss;
1186 ss.print("%s: method '", resolved_klass->external_name());
1187 resolved_method->signature()->print_as_signature_external_return_type(&ss);
1188 ss.print(" %s(", resolved_method->name()->as_C_string());
1189 resolved_method->signature()->print_as_signature_external_parameters(&ss);
1190 ss.print(")' not found");
1191 Exceptions::fthrow(
1192 THREAD_AND_LOCATION,
1193 vmSymbols::java_lang_NoSuchMethodError(),
1194 "%s", ss.as_string());
1195 return nullptr;
1196 }
1197
1198 // ensure that invokespecial's interface method reference is in
1199 // a direct superinterface, not an indirect superinterface
1200 Klass* current_klass = link_info.current_klass();
1201 if (current_klass != nullptr && resolved_klass->is_interface()) {
1202 InstanceKlass* klass_to_check = InstanceKlass::cast(current_klass);
1203 // Disable verification for the dynamically-generated reflection bytecodes
1204 // for serialization constructor accessor.
1205 bool is_reflect = klass_to_check->is_subclass_of(
1206 vmClasses::reflect_SerializationConstructorAccessorImpl_klass());
1207
1208 if (!is_reflect &&
1209 !klass_to_check->is_same_or_direct_interface(resolved_klass)) {
1210 ResourceMark rm(THREAD);
1211 stringStream ss;
1212 ss.print("Interface method reference: '");
1213 resolved_method->print_external_name(&ss);
1214 ss.print("', is in an indirect superinterface of %s",
1215 current_klass->external_name());
1216 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1217 }
1218 }
1219
1220 // check if not static
1221 if (resolved_method->is_static()) {
1222 ResourceMark rm(THREAD);
1223 stringStream ss;
1224 ss.print("Expecting non-static method '");
1225 resolved_method->print_external_name(&ss);
1226 ss.print("'");
1227 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1228 }
1229
1230 if (log_develop_is_enabled(Trace, itables)) {
1231 trace_method_resolution("invokespecial resolved method: caller-class:",
1232 current_klass, resolved_klass, resolved_method, true);
1233 }
1234
1235 return resolved_method;
1236 }
1237
1238 // throws runtime exceptions
1239 void LinkResolver::runtime_resolve_special_method(CallInfo& result,
1240 const LinkInfo& link_info,
1241 const methodHandle& resolved_method,
1242 Handle recv, TRAPS) {
1243
1244 Klass* resolved_klass = link_info.resolved_klass();
1245
1246 // resolved method is selected method unless we have an old-style lookup
1247 // for a superclass method
1248 // Invokespecial for a superinterface, resolved method is selected method,
1249 // no checks for shadowing
1250 methodHandle sel_method(THREAD, resolved_method());
1251
1252 if (link_info.check_access() &&
1253 // check if the method is not <init>
1254 resolved_method->name() != vmSymbols::object_initializer_name()) {
1255
1256 Klass* current_klass = link_info.current_klass();
1257
1258 // Check if the class of the resolved_klass is a superclass
1259 // (not supertype in order to exclude interface classes) of the current class.
1260 // This check is not performed for super.invoke for interface methods
1261 // in super interfaces.
1262 if (current_klass->is_subclass_of(resolved_klass) &&
1263 current_klass != resolved_klass) {
1264 // Lookup super method
1265 Klass* super_klass = current_klass->super();
1266 Method* instance_method = lookup_instance_method_in_klasses(super_klass,
1267 resolved_method->name(),
1268 resolved_method->signature(),
1269 Klass::PrivateLookupMode::find);
1270 sel_method = methodHandle(THREAD, instance_method);
1271
1272 // check if found
1273 if (sel_method.is_null()) {
1274 ResourceMark rm(THREAD);
1275 stringStream ss;
1276 ss.print("'");
1277 resolved_method->print_external_name(&ss);
1278 ss.print("'");
1279 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1280 // check loader constraints if found a different method
1281 } else if (link_info.check_loader_constraints() && sel_method() != resolved_method()) {
1282 check_method_loader_constraints(link_info, sel_method, "method", CHECK);
1283 }
1284 }
1285
1286 // Check that the class of objectref (the receiver) is the current class or interface,
1287 // or a subtype of the current class or interface (the sender), otherwise invokespecial
1288 // throws IllegalAccessError.
1289 // The verifier checks that the sender is a subtype of the class in the I/MR operand.
1290 // The verifier also checks that the receiver is a subtype of the sender, if the sender is
1291 // a class. If the sender is an interface, the check has to be performed at runtime.
1292 InstanceKlass* sender = InstanceKlass::cast(current_klass);
1293 if (sender->is_interface() && recv.not_null()) {
1294 Klass* receiver_klass = recv->klass();
1295 if (!receiver_klass->is_subtype_of(sender)) {
1296 ResourceMark rm(THREAD);
1297 char buf[500];
1298 jio_snprintf(buf, sizeof(buf),
1299 "Receiver class %s must be the current class or a subtype of interface %s",
1300 receiver_klass->external_name(),
1301 sender->external_name());
1302 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), buf);
1303 }
1304 }
1305 }
1306
1307 // check if not static
1308 if (sel_method->is_static()) {
1309 ResourceMark rm(THREAD);
1310 stringStream ss;
1311 ss.print("Expecting non-static method '");
1312 resolved_method->print_external_name(&ss);
1313 ss.print("'");
1314 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1315 }
1316
1317 // check if abstract
1318 if (sel_method->is_abstract()) {
1319 ResourceMark rm(THREAD);
1320 stringStream ss;
1321 ss.print("'");
1322 Method::print_external_name(&ss, resolved_klass, sel_method->name(), sel_method->signature());
1323 ss.print("'");
1324 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1325 }
1326
1327 if (log_develop_is_enabled(Trace, itables)) {
1328 trace_method_resolution("invokespecial selected method: resolved-class:",
1329 resolved_klass, resolved_klass, sel_method(), true);
1330 }
1331
1332 // setup result
1333 result.set_static(resolved_klass, sel_method, CHECK);
1334 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1335 }
1336
1337 void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, Klass* receiver_klass,
1338 const LinkInfo& link_info,
1339 bool check_null_and_abstract, TRAPS) {
1340 Method* resolved_method = linktime_resolve_virtual_method(link_info, CHECK);
1341 runtime_resolve_virtual_method(result, methodHandle(THREAD, resolved_method),
1342 link_info.resolved_klass(),
1343 recv, receiver_klass,
1344 check_null_and_abstract,
1345 /*is_abstract_interpretation*/ false, CHECK);
1346 }
1347
1348 void LinkResolver::cds_resolve_virtual_call(CallInfo& result, const LinkInfo& link_info, TRAPS) {
1349 Method* resolved_method = linktime_resolve_virtual_method(link_info, CHECK);
1350 runtime_resolve_virtual_method(result, methodHandle(THREAD, resolved_method),
1351 link_info.resolved_klass(),
1352 Handle(), nullptr,
1353 /*check_null_and_abstract*/ false,
1354 /*is_abstract_interpretation*/ true, CHECK);
1355 }
1356
1357 // throws linktime exceptions
1358 Method* LinkResolver::linktime_resolve_virtual_method(const LinkInfo& link_info,
1359 TRAPS) {
1360 // normal method resolution
1361 Method* resolved_method = resolve_method(link_info, Bytecodes::_invokevirtual, CHECK_NULL);
1362
1363 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1364 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1365
1366 // check if private interface method
1367 Klass* resolved_klass = link_info.resolved_klass();
1368 Klass* current_klass = link_info.current_klass();
1369
1370 // This is impossible, if resolve_klass is an interface, we've thrown icce in resolve_method
1371 if (resolved_klass->is_interface() && resolved_method->is_private()) {
1372 ResourceMark rm(THREAD);
1373 stringStream ss;
1374 ss.print("private interface method requires invokespecial, not invokevirtual: method '");
1375 resolved_method->print_external_name(&ss);
1376 ss.print("', caller-class: %s",
1377 (current_klass == nullptr ? "<null>" : current_klass->internal_name()));
1378 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1379 }
1380
1381 // check if not static
1382 if (resolved_method->is_static()) {
1383 ResourceMark rm(THREAD);
1384 stringStream ss;
1385 ss.print("Expecting non-static method '");
1386 resolved_method->print_external_name(&ss);
1387 ss.print("'");
1388 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1389 }
1390
1391 if (log_develop_is_enabled(Trace, vtables)) {
1392 trace_method_resolution("invokevirtual resolved method: caller-class:",
1393 current_klass, resolved_klass, resolved_method, false);
1394 }
1395
1396 return resolved_method;
1397 }
1398
1399 // throws runtime exceptions
1400 void LinkResolver::runtime_resolve_virtual_method(CallInfo& result,
1401 const methodHandle& resolved_method,
1402 Klass* resolved_klass,
1403 Handle recv,
1404 Klass* recv_klass,
1405 bool check_null_and_abstract,
1406 bool is_abstract_interpretation,
1407 TRAPS) {
1408 // is_abstract_interpretation is true IFF CDS is resolving method references without
1409 // running any actual bytecode. Therefore, we don't have an actual recv/recv_klass, so
1410 // we cannot check the actual selected_method (which is not needed by CDS anyway).
1411
1412 // setup default return values
1413 int vtable_index = Method::invalid_vtable_index;
1414 methodHandle selected_method;
1415
1416 // runtime method resolution
1417 if (check_null_and_abstract && recv.is_null()) { // check if receiver exists
1418 THROW(vmSymbols::java_lang_NullPointerException());
1419 }
1420
1421 // Virtual methods cannot be resolved before its klass has been linked, for otherwise the Method*'s
1422 // has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since
1423 // a missing receiver might result in a bogus lookup.
1424 assert(resolved_method->method_holder()->is_linked(), "must be linked");
1425
1426 // do lookup based on receiver klass using the vtable index
1427 if (resolved_method->method_holder()->is_interface()) { // default or miranda method
1428 vtable_index = vtable_index_of_interface_method(resolved_klass, resolved_method);
1429 assert(vtable_index >= 0 , "we should have valid vtable index at this point");
1430
1431 if (!is_abstract_interpretation) {
1432 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1433 }
1434 } else {
1435 // at this point we are sure that resolved_method is virtual and not
1436 // a default or miranda method; therefore, it must have a valid vtable index.
1437 assert(!resolved_method->has_itable_index(), "");
1438 vtable_index = resolved_method->vtable_index();
1439 // We could get a negative vtable_index of nonvirtual_vtable_index for private
1440 // methods, or for final methods. Private methods never appear in the vtable
1441 // and never override other methods. As an optimization, final methods are
1442 // never put in the vtable, unless they override an existing method.
1443 // So if we do get nonvirtual_vtable_index, it means the selected method is the
1444 // resolved method, and it can never be changed by an override.
1445 if (vtable_index == Method::nonvirtual_vtable_index) {
1446 assert(resolved_method->can_be_statically_bound(), "cannot override this method");
1447 if (!is_abstract_interpretation) {
1448 selected_method = resolved_method;
1449 }
1450 } else {
1451 if (!is_abstract_interpretation) {
1452 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1453 }
1454 }
1455 }
1456
1457 if (!is_abstract_interpretation) {
1458 // check if method exists
1459 if (selected_method.is_null()) {
1460 throw_abstract_method_error(resolved_method, recv_klass, CHECK);
1461 }
1462
1463 // check if abstract
1464 if (check_null_and_abstract && selected_method->is_abstract()) {
1465 // Pass arguments for generating a verbose error message.
1466 throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK);
1467 }
1468
1469 if (log_develop_is_enabled(Trace, vtables)) {
1470 trace_method_resolution("invokevirtual selected method: receiver-class:",
1471 recv_klass, resolved_klass, selected_method(),
1472 false, vtable_index);
1473 }
1474 }
1475
1476 // setup result
1477 result.set_virtual(resolved_klass, resolved_method, selected_method, vtable_index, CHECK);
1478 if (selected_method.not_null()) {
1479 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1480 }
1481 }
1482
1483 void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, Klass* recv_klass,
1484 const LinkInfo& link_info,
1485 bool check_null_and_abstract, TRAPS) {
1486 // throws linktime exceptions
1487 Method* resolved_method = linktime_resolve_interface_method(link_info, CHECK);
1488 methodHandle mh(THREAD, resolved_method);
1489 runtime_resolve_interface_method(result, mh, link_info.resolved_klass(),
1490 recv, recv_klass, check_null_and_abstract,
1491 /*is_abstract_interpretation*/ false, CHECK);
1492 }
1493
1494 void LinkResolver::cds_resolve_interface_call(CallInfo& result, const LinkInfo& link_info, TRAPS) {
1495 Method* resolved_method = linktime_resolve_interface_method(link_info, CHECK);
1496 runtime_resolve_interface_method(result, methodHandle(THREAD, resolved_method), link_info.resolved_klass(),
1497 Handle(), nullptr,
1498 /*check_null_and_abstract*/ false,
1499 /*is_abstract_interpretation*/ true, CHECK);
1500 }
1501
1502 Method* LinkResolver::linktime_resolve_interface_method(const LinkInfo& link_info,
1503 TRAPS) {
1504 // normal interface method resolution
1505 Method* resolved_method = resolve_interface_method(link_info, Bytecodes::_invokeinterface, CHECK_NULL);
1506 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1507 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1508
1509 return resolved_method;
1510 }
1511
1512 // throws runtime exceptions
1513 void LinkResolver::runtime_resolve_interface_method(CallInfo& result,
1514 const methodHandle& resolved_method,
1515 Klass* resolved_klass,
1516 Handle recv,
1517 Klass* recv_klass,
1518 bool check_null_and_abstract,
1519 bool is_abstract_interpretation, TRAPS) {
1520 // is_abstract_interpretation -- see comments in runtime_resolve_virtual_method()
1521
1522 // check if receiver exists
1523 if (check_null_and_abstract && recv.is_null()) {
1524 THROW(vmSymbols::java_lang_NullPointerException());
1525 }
1526
1527 // check if receiver klass implements the resolved interface
1528 if (!is_abstract_interpretation && !recv_klass->is_subtype_of(resolved_klass)) {
1529 ResourceMark rm(THREAD);
1530 char buf[200];
1531 jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s",
1532 recv_klass->external_name(),
1533 resolved_klass->external_name());
1534 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1535 }
1536
1537 methodHandle selected_method;
1538
1539 if (!is_abstract_interpretation) {
1540 selected_method = resolved_method;
1541 }
1542
1543 // resolve the method in the receiver class, unless it is private
1544 if (!is_abstract_interpretation && !resolved_method->is_private()) {
1545 // do lookup based on receiver klass
1546 // This search must match the linktime preparation search for itable initialization
1547 // to correctly enforce loader constraints for interface method inheritance.
1548 // Private methods are skipped as the resolved method was not private.
1549 Method* method = lookup_instance_method_in_klasses(recv_klass,
1550 resolved_method->name(),
1551 resolved_method->signature(),
1552 Klass::PrivateLookupMode::skip);
1553 selected_method = methodHandle(THREAD, method);
1554
1555 if (selected_method.is_null() && !check_null_and_abstract) {
1556 // In theory this is a harmless placeholder value, but
1557 // in practice leaving in null affects the nsk default method tests.
1558 // This needs further study.
1559 selected_method = resolved_method;
1560 }
1561 // check if method exists
1562 if (selected_method.is_null()) {
1563 // Pass arguments for generating a verbose error message.
1564 throw_abstract_method_error(resolved_method, recv_klass, CHECK);
1565 }
1566 // check access
1567 // Throw Illegal Access Error if selected_method is not public.
1568 if (!selected_method->is_public()) {
1569 ResourceMark rm(THREAD);
1570 stringStream ss;
1571 ss.print("'");
1572 Method::print_external_name(&ss, recv_klass, selected_method->name(), selected_method->signature());
1573 ss.print("'");
1574 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
1575 }
1576 // check if abstract
1577 if (check_null_and_abstract && selected_method->is_abstract()) {
1578 throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK);
1579 }
1580 }
1581
1582 if (log_develop_is_enabled(Trace, itables)) {
1583 trace_method_resolution("invokeinterface selected method: receiver-class:",
1584 recv_klass, resolved_klass, selected_method(), true);
1585 }
1586 // setup result
1587 if (resolved_method->has_vtable_index()) {
1588 int vtable_index = resolved_method->vtable_index();
1589 log_develop_trace(itables)(" -- vtable index: %d", vtable_index);
1590 assert(is_abstract_interpretation || vtable_index == selected_method->vtable_index(), "sanity check");
1591 result.set_virtual(resolved_klass, resolved_method, selected_method, vtable_index, CHECK);
1592 } else if (resolved_method->has_itable_index()) {
1593 int itable_index = resolved_method->itable_index();
1594 log_develop_trace(itables)(" -- itable index: %d", itable_index);
1595 result.set_interface(resolved_klass, resolved_method, selected_method, itable_index, CHECK);
1596 } else {
1597 int index = resolved_method->vtable_index();
1598 log_develop_trace(itables)(" -- non itable/vtable index: %d", index);
1599 assert(index == Method::nonvirtual_vtable_index, "Oops hit another case!");
1600 assert(resolved_method->is_private() ||
1601 (resolved_method->is_final() && resolved_method->method_holder() == vmClasses::Object_klass()),
1602 "Should only have non-virtual invokeinterface for private or final-Object methods!");
1603 assert(resolved_method->can_be_statically_bound(), "Should only have non-virtual invokeinterface for statically bound methods!");
1604 // This sets up the nonvirtual form of "virtual" call (as needed for final and private methods)
1605 result.set_virtual(resolved_klass, resolved_method, resolved_method, index, CHECK);
1606 }
1607 if (!is_abstract_interpretation) {
1608 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1609 }
1610 }
1611
1612
1613 Method* LinkResolver::linktime_resolve_interface_method_or_null(
1614 const LinkInfo& link_info) {
1615 EXCEPTION_MARK;
1616 Method* method_result = linktime_resolve_interface_method(link_info, THREAD);
1617 if (HAS_PENDING_EXCEPTION) {
1618 CLEAR_PENDING_EXCEPTION;
1619 return nullptr;
1620 } else {
1621 return method_result;
1622 }
1623 }
1624
1625 Method* LinkResolver::linktime_resolve_virtual_method_or_null(
1626 const LinkInfo& link_info) {
1627 EXCEPTION_MARK;
1628 Method* method_result = linktime_resolve_virtual_method(link_info, THREAD);
1629 if (HAS_PENDING_EXCEPTION) {
1630 CLEAR_PENDING_EXCEPTION;
1631 return nullptr;
1632 } else {
1633 return method_result;
1634 }
1635 }
1636
1637 Method* LinkResolver::resolve_virtual_call_or_null(
1638 Klass* receiver_klass,
1639 const LinkInfo& link_info) {
1640 EXCEPTION_MARK;
1641 CallInfo info;
1642 resolve_virtual_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1643 if (HAS_PENDING_EXCEPTION) {
1644 CLEAR_PENDING_EXCEPTION;
1645 return nullptr;
1646 }
1647 return info.selected_method();
1648 }
1649
1650 Method* LinkResolver::resolve_interface_call_or_null(
1651 Klass* receiver_klass,
1652 const LinkInfo& link_info) {
1653 EXCEPTION_MARK;
1654 CallInfo info;
1655 resolve_interface_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1656 if (HAS_PENDING_EXCEPTION) {
1657 CLEAR_PENDING_EXCEPTION;
1658 return nullptr;
1659 }
1660 return info.selected_method();
1661 }
1662
1663 int LinkResolver::resolve_virtual_vtable_index(Klass* receiver_klass,
1664 const LinkInfo& link_info) {
1665 EXCEPTION_MARK;
1666 CallInfo info;
1667 resolve_virtual_call(info, Handle(), receiver_klass, link_info,
1668 /*check_null_or_abstract*/false, THREAD);
1669 if (HAS_PENDING_EXCEPTION) {
1670 CLEAR_PENDING_EXCEPTION;
1671 return Method::invalid_vtable_index;
1672 }
1673 return info.vtable_index();
1674 }
1675
1676 Method* LinkResolver::resolve_static_call_or_null(const LinkInfo& link_info) {
1677 EXCEPTION_MARK;
1678 CallInfo info;
1679 resolve_static_call(info, link_info, /*initialize_class*/false, THREAD);
1680 if (HAS_PENDING_EXCEPTION) {
1681 CLEAR_PENDING_EXCEPTION;
1682 return nullptr;
1683 }
1684 return info.selected_method();
1685 }
1686
1687 Method* LinkResolver::resolve_special_call_or_null(const LinkInfo& link_info) {
1688 EXCEPTION_MARK;
1689 CallInfo info;
1690 resolve_special_call(info, Handle(), link_info, THREAD);
1691 if (HAS_PENDING_EXCEPTION) {
1692 CLEAR_PENDING_EXCEPTION;
1693 return nullptr;
1694 }
1695 return info.selected_method();
1696 }
1697
1698
1699
1700 //------------------------------------------------------------------------------------------------------------------------
1701 // ConstantPool entries
1702
1703 void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) {
1704 switch (byte) {
1705 case Bytecodes::_invokestatic : resolve_invokestatic (result, pool, index, CHECK); break;
1706 case Bytecodes::_invokespecial : resolve_invokespecial (result, recv, pool, index, CHECK); break;
1707 case Bytecodes::_invokevirtual : resolve_invokevirtual (result, recv, pool, index, CHECK); break;
1708 case Bytecodes::_invokehandle : resolve_invokehandle (result, pool, index, CHECK); break;
1709 case Bytecodes::_invokedynamic : resolve_invokedynamic (result, pool, index, CHECK); break;
1710 case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break;
1711 default : break;
1712 }
1713 return;
1714 }
1715
1716 void LinkResolver::resolve_invoke(CallInfo& result, Handle& recv,
1717 const methodHandle& attached_method,
1718 Bytecodes::Code byte, TRAPS) {
1719 Klass* defc = attached_method->method_holder();
1720 Symbol* name = attached_method->name();
1721 Symbol* type = attached_method->signature();
1722 LinkInfo link_info(defc, name, type);
1723 switch(byte) {
1724 case Bytecodes::_invokevirtual:
1725 resolve_virtual_call(result, recv, recv->klass(), link_info,
1726 /*check_null_and_abstract=*/true, CHECK);
1727 break;
1728 case Bytecodes::_invokeinterface:
1729 resolve_interface_call(result, recv, recv->klass(), link_info,
1730 /*check_null_and_abstract=*/true, CHECK);
1731 break;
1732 case Bytecodes::_invokestatic:
1733 resolve_static_call(result, link_info, /*initialize_class=*/false, CHECK);
1734 break;
1735 case Bytecodes::_invokespecial:
1736 resolve_special_call(result, recv, link_info, CHECK);
1737 break;
1738 default:
1739 fatal("bad call: %s", Bytecodes::name(byte));
1740 break;
1741 }
1742 }
1743
1744 void LinkResolver::resolve_invokestatic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1745 LinkInfo link_info(pool, index, Bytecodes::_invokestatic, CHECK);
1746 resolve_static_call(result, link_info, /*initialize_class*/true, CHECK);
1747 }
1748
1749
1750 void LinkResolver::resolve_invokespecial(CallInfo& result, Handle recv,
1751 const constantPoolHandle& pool, int index, TRAPS) {
1752 LinkInfo link_info(pool, index, Bytecodes::_invokespecial, CHECK);
1753 resolve_special_call(result, recv, link_info, CHECK);
1754 }
1755
1756
1757 void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv,
1758 const constantPoolHandle& pool, int index,
1759 TRAPS) {
1760
1761 LinkInfo link_info(pool, index, Bytecodes::_invokevirtual, CHECK);
1762 Klass* recvrKlass = recv.is_null() ? (Klass*)nullptr : recv->klass();
1763 resolve_virtual_call(result, recv, recvrKlass, link_info, /*check_null_or_abstract*/true, CHECK);
1764 }
1765
1766
1767 void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, TRAPS) {
1768 LinkInfo link_info(pool, index, Bytecodes::_invokeinterface, CHECK);
1769 Klass* recvrKlass = recv.is_null() ? (Klass*)nullptr : recv->klass();
1770 resolve_interface_call(result, recv, recvrKlass, link_info, true, CHECK);
1771 }
1772
1773 bool LinkResolver::resolve_previously_linked_invokehandle(CallInfo& result, const LinkInfo& link_info, const constantPoolHandle& pool, int index, TRAPS) {
1774 ResolvedMethodEntry* method_entry = pool->cache()->resolved_method_entry_at(index);
1775 if (method_entry->method() != nullptr) {
1776 Klass* resolved_klass = link_info.resolved_klass();
1777 methodHandle method(THREAD, method_entry->method());
1778 Handle appendix(THREAD, pool->cache()->appendix_if_resolved(method_entry));
1779 result.set_handle(resolved_klass, method, appendix, CHECK_false);
1780 JFR_ONLY(Jfr::on_resolution(result, CHECK_false);)
1781 return true;
1782 } else {
1783 return false;
1784 }
1785 }
1786
1787 void LinkResolver::resolve_invokehandle(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1788
1789 PerfTraceTimedEvent timer(ClassLoader::perf_resolve_invokehandle_time(),
1790 ClassLoader::perf_resolve_invokehandle_count());
1791
1792 LinkInfo link_info(pool, index, Bytecodes::_invokehandle, CHECK);
1793 if (log_is_enabled(Info, methodhandles)) {
1794 ResourceMark rm(THREAD);
1795 log_info(methodhandles)("resolve_invokehandle %s %s", link_info.name()->as_C_string(),
1796 link_info.signature()->as_C_string());
1797 }
1798 { // Check if the call site has been bound already, and short circuit:
1799 bool is_done = resolve_previously_linked_invokehandle(result, link_info, pool, index, CHECK);
1800 if (is_done) return;
1801 }
1802 resolve_handle_call(result, link_info, CHECK);
1803 }
1804
1805 void LinkResolver::resolve_handle_call(CallInfo& result,
1806 const LinkInfo& link_info,
1807 TRAPS) {
1808 // JSR 292: this must be an implicitly generated method MethodHandle.invokeExact(*...) or similar
1809 Klass* resolved_klass = link_info.resolved_klass();
1810 assert(resolved_klass == vmClasses::MethodHandle_klass() ||
1811 resolved_klass == vmClasses::VarHandle_klass(), "");
1812 assert(MethodHandles::is_signature_polymorphic_name(link_info.name()), "");
1813 Handle resolved_appendix;
1814 Method* m = lookup_polymorphic_method(link_info, &resolved_appendix, CHECK);
1815 methodHandle resolved_method(THREAD, m);
1816
1817 if (link_info.check_access()) {
1818 Symbol* name = link_info.name();
1819 vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name);
1820 if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) {
1821 // Check if method can be accessed by the referring class.
1822 // MH.linkTo* invocations are not rewritten to invokehandle.
1823 assert(iid == vmIntrinsicID::_invokeBasic, "%s", vmIntrinsics::name_at(iid));
1824
1825 Klass* current_klass = link_info.current_klass();
1826 assert(current_klass != nullptr , "current_klass should not be null");
1827 check_method_accessability(current_klass,
1828 resolved_klass,
1829 resolved_method->method_holder(),
1830 resolved_method,
1831 CHECK);
1832 } else {
1833 // Java code is free to arbitrarily link signature-polymorphic invokers.
1834 assert(iid == vmIntrinsics::_invokeGeneric, "not an invoker: %s", vmIntrinsics::name_at(iid));
1835 assert(MethodHandles::is_signature_polymorphic_public_name(resolved_klass, name), "not public");
1836 }
1837 }
1838 result.set_handle(resolved_klass, resolved_method, resolved_appendix, CHECK);
1839 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1840 }
1841
1842 void LinkResolver::resolve_invokedynamic(CallInfo& result, const constantPoolHandle& pool, int indy_index, TRAPS) {
1843 PerfTraceTimedEvent timer(ClassLoader::perf_resolve_invokedynamic_time(),
1844 ClassLoader::perf_resolve_invokedynamic_count());
1845
1846 int pool_index = pool->resolved_indy_entry_at(indy_index)->constant_pool_index();
1847
1848 // Resolve the bootstrap specifier (BSM + optional arguments).
1849 BootstrapInfo bootstrap_specifier(pool, pool_index, indy_index);
1850
1851 // Check if CallSite has been bound already or failed already, and short circuit:
1852 {
1853 bool is_done = bootstrap_specifier.resolve_previously_linked_invokedynamic(result, CHECK);
1854 if (is_done) return;
1855 }
1856
1857 // The initial step in Call Site Specifier Resolution is to resolve the symbolic
1858 // reference to a method handle which will be the bootstrap method for a dynamic
1859 // call site. If resolution for the java.lang.invoke.MethodHandle for the bootstrap
1860 // method fails, then a MethodHandleInError is stored at the corresponding bootstrap
1861 // method's CP index for the CONSTANT_MethodHandle_info.
1862 // Any subsequent invokedynamic instruction which shares
1863 // this bootstrap method will encounter the resolution of MethodHandleInError.
1864
1865 resolve_dynamic_call(result, bootstrap_specifier, CHECK);
1866
1867 LogTarget(Debug, methodhandles, indy) lt_indy;
1868 if (lt_indy.is_enabled()) {
1869 LogStream ls(lt_indy);
1870 bootstrap_specifier.print_msg_on(&ls, "resolve_invokedynamic");
1871 }
1872
1873 // The returned linkage result is provisional up to the moment
1874 // the interpreter or runtime performs a serialized check of
1875 // the relevant ResolvedIndyEntry::method field. This is done by the caller
1876 // of this method, via CPC::set_dynamic_call, which uses
1877 // an ObjectLocker to do the final serialization of updates
1878 // to ResolvedIndyEntry state, including method.
1879
1880 // Log dynamic info to CDS classlist.
1881 ArchiveUtils::log_to_classlist(&bootstrap_specifier, CHECK);
1882 }
1883
1884 void LinkResolver::resolve_dynamic_call(CallInfo& result,
1885 BootstrapInfo& bootstrap_specifier,
1886 TRAPS) {
1887 // JSR 292: this must resolve to an implicitly generated method
1888 // such as MH.linkToCallSite(*...) or some other call-site shape.
1889 // The appendix argument is likely to be a freshly-created CallSite.
1890 // It may also be a MethodHandle from an unwrapped ConstantCallSite,
1891 // or any other reference. The resolved_method as well as the appendix
1892 // are both recorded together via CallInfo::set_handle.
1893 SystemDictionary::invoke_bootstrap_method(bootstrap_specifier, THREAD);
1894 Exceptions::wrap_dynamic_exception(/* is_indy */ true, THREAD);
1895
1896 if (HAS_PENDING_EXCEPTION) {
1897 if (!PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass())) {
1898 // Let any random low-level IE or SOE or OOME just bleed through.
1899 // Basically we pretend that the bootstrap method was never called,
1900 // if it fails this way: We neither record a successful linkage,
1901 // nor do we memorize a LE for posterity.
1902 return;
1903 }
1904 // JVMS 5.4.3 says: If an attempt by the Java Virtual Machine to resolve
1905 // a symbolic reference fails because an error is thrown that is an
1906 // instance of LinkageError (or a subclass), then subsequent attempts to
1907 // resolve the reference always fail with the same error that was thrown
1908 // as a result of the initial resolution attempt.
1909 bool recorded_res_status = bootstrap_specifier.save_and_throw_indy_exc(CHECK);
1910 if (!recorded_res_status) {
1911 // Another thread got here just before we did. So, either use the method
1912 // that it resolved or throw the LinkageError exception that it threw.
1913 bool is_done = bootstrap_specifier.resolve_previously_linked_invokedynamic(result, CHECK);
1914 if (is_done) return;
1915 }
1916 assert(bootstrap_specifier.pool()->resolved_indy_entry_at(bootstrap_specifier.indy_index())->resolution_failed(),
1917 "Resolution should have failed");
1918 }
1919
1920 bootstrap_specifier.resolve_newly_linked_invokedynamic(result, CHECK);
1921 // Exceptions::wrap_dynamic_exception not used because
1922 // set_handle doesn't throw linkage errors
1923 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1924 }
1925
1926 // Selected method is abstract.
1927 void LinkResolver::throw_abstract_method_error(const methodHandle& resolved_method,
1928 const methodHandle& selected_method,
1929 Klass *recv_klass, TRAPS) {
1930 Klass *resolved_klass = resolved_method->method_holder();
1931 ResourceMark rm(THREAD);
1932 stringStream ss;
1933
1934 if (recv_klass != nullptr) {
1935 ss.print("Receiver class %s does not define or inherit an "
1936 "implementation of the",
1937 recv_klass->external_name());
1938 } else {
1939 ss.print("Missing implementation of");
1940 }
1941
1942 assert(resolved_method.not_null(), "Sanity");
1943 ss.print(" resolved method '%s%s",
1944 resolved_method->is_abstract() ? "abstract " : "",
1945 resolved_method->is_private() ? "private " : "");
1946 resolved_method->signature()->print_as_signature_external_return_type(&ss);
1947 ss.print(" %s(", resolved_method->name()->as_C_string());
1948 resolved_method->signature()->print_as_signature_external_parameters(&ss);
1949 ss.print(")' of %s %s.",
1950 resolved_klass->external_kind(),
1951 resolved_klass->external_name());
1952
1953 if (selected_method.not_null() && !(resolved_method == selected_method)) {
1954 ss.print(" Selected method is '%s%s",
1955 selected_method->is_abstract() ? "abstract " : "",
1956 selected_method->is_private() ? "private " : "");
1957 selected_method->print_external_name(&ss);
1958 ss.print("'.");
1959 }
1960
1961 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1962 }