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, bool initialize_class,
998 TRAPS) {
999 assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic ||
1000 byte == Bytecodes::_getfield || byte == Bytecodes::_putfield ||
1001 byte == Bytecodes::_nofast_getfield || byte == Bytecodes::_nofast_putfield ||
1002 (byte == Bytecodes::_nop && !link_info.check_access()), "bad field access bytecode");
1003
1004 bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic);
1005 bool is_put = (byte == Bytecodes::_putfield || byte == Bytecodes::_putstatic || byte == Bytecodes::_nofast_putfield);
1006 // Check if there's a resolved klass containing the field
1007 Klass* resolved_klass = link_info.resolved_klass();
1008 Symbol* field = link_info.name();
1009 Symbol* sig = link_info.signature();
1010
1011 // Resolve instance field
1012 Klass* sel_klass = resolved_klass->find_field(field, sig, &fd);
1013 // check if field exists; i.e., if a klass containing the field def has been selected
1014 if (sel_klass == nullptr) {
1015 ResourceMark rm(THREAD);
1016 stringStream ss;
1017 ss.print("Class %s does not have member field '", resolved_klass->external_name());
1018 sig->print_as_field_external_type(&ss);
1019 ss.print(" %s'", field->as_C_string());
1020 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), ss.as_string());
1021 }
1022
1023 // Access checking may be turned off when calling from within the VM.
1024 Klass* current_klass = link_info.current_klass();
1025 if (link_info.check_access()) {
1026
1027 // check access
1028 check_field_accessability(current_klass, resolved_klass, sel_klass, fd, CHECK);
1029
1030 // check for errors
1031 if (is_static != fd.is_static()) {
1032 ResourceMark rm(THREAD);
1033 char msg[200];
1034 jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string());
1035 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg);
1036 }
1037
1038 // A final field can be modified only
1039 // (1) by methods declared in the class declaring the field and
1040 // (2) by the <clinit> method (in case of a static field)
1041 // or by the <init> method (in case of an instance field).
1042 if (is_put && fd.access_flags().is_final()) {
1043
1044 if (sel_klass != current_klass) {
1045 ResourceMark rm(THREAD);
1046 stringStream ss;
1047 ss.print("Update to %s final field %s.%s attempted from a different class (%s) than the field's declaring class",
1048 is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(),
1049 current_klass->external_name());
1050 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
1051 }
1052
1053 if (fd.constants()->pool_holder()->major_version() >= 53) {
1054 Method* m = link_info.current_method();
1055 assert(m != nullptr, "information about the current method must be available for 'put' bytecodes");
1056 bool is_initialized_static_final_update = (byte == Bytecodes::_putstatic &&
1057 fd.is_static() &&
1058 !m->is_static_initializer());
1059 bool is_initialized_instance_final_update = ((byte == Bytecodes::_putfield || byte == Bytecodes::_nofast_putfield) &&
1060 !fd.is_static() &&
1061 !m->is_object_initializer());
1062
1063 if (is_initialized_static_final_update || is_initialized_instance_final_update) {
1064 ResourceMark rm(THREAD);
1065 stringStream ss;
1066 ss.print("Update to %s final field %s.%s attempted from a different method (%s) than the initializer method %s ",
1067 is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(),
1068 m->name()->as_C_string(),
1069 is_static ? "<clinit>" : "<init>");
1070 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
1071 }
1072 }
1073 }
1074
1075 // initialize resolved_klass if necessary
1076 // note 1: the klass which declared the field must be initialized (i.e, sel_klass)
1077 // according to the newest JVM spec (5.5, p.170) - was bug (gri 7/28/99)
1078 //
1079 // note 2: we don't want to force initialization if we are just checking
1080 // if the field access is legal; e.g., during compilation
1081 if (is_static && initialize_class) {
1082 sel_klass->initialize(CHECK);
1083 }
1084 }
1085
1086 if (link_info.check_loader_constraints() && (sel_klass != current_klass) && (current_klass != nullptr)) {
1087 check_field_loader_constraints(field, sig, current_klass, sel_klass, CHECK);
1088 }
1089
1090 // return information. note that the klass is set to the actual klass containing the
1091 // field, otherwise access of static fields in superclasses will not work.
1092 }
1093
1094
1095 //------------------------------------------------------------------------------------------------------------------------
1096 // Invoke resolution
1097 //
1098 // Naming conventions:
1099 //
1100 // resolved_method the specified method (i.e., static receiver specified via constant pool index)
1101 // sel_method the selected method (selected via run-time lookup; e.g., based on dynamic receiver class)
1102 // resolved_klass the specified klass (i.e., specified via constant pool index)
1103 // recv_klass the receiver klass
1104
1105
1106 void LinkResolver::resolve_static_call(CallInfo& result,
1107 const LinkInfo& link_info,
1108 bool initialize_class, TRAPS) {
1109 Method* resolved_method = linktime_resolve_static_method(link_info, CHECK);
1110
1111 // The resolved class can change as a result of this resolution.
1112 Klass* resolved_klass = resolved_method->method_holder();
1113
1114 // Initialize klass (this should only happen if everything is ok)
1115 if (initialize_class && resolved_klass->should_be_initialized()) {
1116 resolved_klass->initialize(CHECK);
1117 // Use updated LinkInfo to reresolve with resolved method holder
1118 LinkInfo new_info(resolved_klass, link_info.name(), link_info.signature(),
1119 link_info.current_klass(),
1120 link_info.check_access() ? LinkInfo::AccessCheck::required : LinkInfo::AccessCheck::skip,
1121 link_info.check_loader_constraints() ? LinkInfo::LoaderConstraintCheck::required : LinkInfo::LoaderConstraintCheck::skip);
1122 resolved_method = linktime_resolve_static_method(new_info, CHECK);
1123 }
1124
1125 // setup result
1126 result.set_static(resolved_klass, methodHandle(THREAD, resolved_method), CHECK);
1127 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1128 }
1129
1130 // throws linktime exceptions
1131 Method* LinkResolver::linktime_resolve_static_method(const LinkInfo& link_info, TRAPS) {
1132
1133 Klass* resolved_klass = link_info.resolved_klass();
1134 Method* resolved_method;
1135 if (!resolved_klass->is_interface()) {
1136 resolved_method = resolve_method(link_info, Bytecodes::_invokestatic, CHECK_NULL);
1137 } else {
1138 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokestatic, CHECK_NULL);
1139 }
1140 assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier");
1141
1142 // check if static
1143 if (!resolved_method->is_static()) {
1144 ResourceMark rm(THREAD);
1145 stringStream ss;
1146 ss.print("Expected static method '");
1147 resolved_method->print_external_name(&ss);
1148 ss.print("'");
1149 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1150 }
1151 return resolved_method;
1152 }
1153
1154
1155 void LinkResolver::resolve_special_call(CallInfo& result,
1156 Handle recv,
1157 const LinkInfo& link_info,
1158 TRAPS) {
1159 Method* resolved_method = linktime_resolve_special_method(link_info, CHECK);
1160 runtime_resolve_special_method(result, link_info, methodHandle(THREAD, resolved_method), recv, CHECK);
1161 }
1162
1163 void LinkResolver::cds_resolve_special_call(CallInfo& result, const LinkInfo& link_info, TRAPS) {
1164 resolve_special_call(result, Handle(), link_info, CHECK);
1165 }
1166
1167 // throws linktime exceptions
1168 Method* LinkResolver::linktime_resolve_special_method(const LinkInfo& link_info, TRAPS) {
1169
1170 // Invokespecial is called for multiple special reasons:
1171 // <init>
1172 // local private method invocation, for classes and interfaces
1173 // superclass.method, which can also resolve to a default method
1174 // and the selected method is recalculated relative to the direct superclass
1175 // superinterface.method, which explicitly does not check shadowing
1176 Klass* resolved_klass = link_info.resolved_klass();
1177 Method* resolved_method = nullptr;
1178
1179 if (!resolved_klass->is_interface()) {
1180 resolved_method = resolve_method(link_info, Bytecodes::_invokespecial, CHECK_NULL);
1181 } else {
1182 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokespecial, CHECK_NULL);
1183 }
1184
1185 // check if method name is <init>, that it is found in same klass as static type
1186 if (resolved_method->name() == vmSymbols::object_initializer_name() &&
1187 resolved_method->method_holder() != resolved_klass) {
1188 ResourceMark rm(THREAD);
1189 stringStream ss;
1190 ss.print("%s: method '", resolved_klass->external_name());
1191 resolved_method->signature()->print_as_signature_external_return_type(&ss);
1192 ss.print(" %s(", resolved_method->name()->as_C_string());
1193 resolved_method->signature()->print_as_signature_external_parameters(&ss);
1194 ss.print(")' not found");
1195 // Names are all known to be < 64k so we know this formatted message is not excessively large.
1196 Exceptions::fthrow(
1197 THREAD_AND_LOCATION,
1198 vmSymbols::java_lang_NoSuchMethodError(),
1199 "%s", ss.as_string());
1200 return nullptr;
1201 }
1202
1203 // ensure that invokespecial's interface method reference is in
1204 // a direct superinterface, not an indirect superinterface
1205 Klass* current_klass = link_info.current_klass();
1206 if (current_klass != nullptr && resolved_klass->is_interface()) {
1207 InstanceKlass* klass_to_check = InstanceKlass::cast(current_klass);
1208 if (!klass_to_check->is_same_or_direct_interface(resolved_klass)) {
1209 ResourceMark rm(THREAD);
1210 stringStream ss;
1211 ss.print("Interface method reference: '");
1212 resolved_method->print_external_name(&ss);
1213 ss.print("', is in an indirect superinterface of %s",
1214 current_klass->external_name());
1215 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1216 }
1217 }
1218
1219 // check if not static
1220 if (resolved_method->is_static()) {
1221 ResourceMark rm(THREAD);
1222 stringStream ss;
1223 ss.print("Expecting non-static method '");
1224 resolved_method->print_external_name(&ss);
1225 ss.print("'");
1226 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1227 }
1228
1229 if (log_develop_is_enabled(Trace, itables)) {
1230 trace_method_resolution("invokespecial resolved method: caller-class:",
1231 current_klass, resolved_klass, resolved_method, true);
1232 }
1233
1234 return resolved_method;
1235 }
1236
1237 // throws runtime exceptions
1238 void LinkResolver::runtime_resolve_special_method(CallInfo& result,
1239 const LinkInfo& link_info,
1240 const methodHandle& resolved_method,
1241 Handle recv, TRAPS) {
1242
1243 Klass* resolved_klass = link_info.resolved_klass();
1244
1245 // resolved method is selected method unless we have an old-style lookup
1246 // for a superclass method
1247 // Invokespecial for a superinterface, resolved method is selected method,
1248 // no checks for shadowing
1249 methodHandle sel_method(THREAD, resolved_method());
1250
1251 if (link_info.check_access() &&
1252 // check if the method is not <init>
1253 resolved_method->name() != vmSymbols::object_initializer_name()) {
1254
1255 Klass* current_klass = link_info.current_klass();
1256
1257 // Check if the class of the resolved_klass is a superclass
1258 // (not supertype in order to exclude interface classes) of the current class.
1259 // This check is not performed for super.invoke for interface methods
1260 // in super interfaces.
1261 if (current_klass->is_subclass_of(resolved_klass) &&
1262 current_klass != resolved_klass) {
1263 // Lookup super method
1264 Klass* super_klass = current_klass->super();
1265 Method* instance_method = lookup_instance_method_in_klasses(super_klass,
1266 resolved_method->name(),
1267 resolved_method->signature(),
1268 Klass::PrivateLookupMode::find);
1269 sel_method = methodHandle(THREAD, instance_method);
1270
1271 // check if found
1272 if (sel_method.is_null()) {
1273 ResourceMark rm(THREAD);
1274 stringStream ss;
1275 ss.print("'");
1276 resolved_method->print_external_name(&ss);
1277 ss.print("'");
1278 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1279 // check loader constraints if found a different method
1280 } else if (link_info.check_loader_constraints() && sel_method() != resolved_method()) {
1281 check_method_loader_constraints(link_info, sel_method, "method", CHECK);
1282 }
1283 }
1284
1285 // Check that the class of objectref (the receiver) is the current class or interface,
1286 // or a subtype of the current class or interface (the sender), otherwise invokespecial
1287 // throws IllegalAccessError.
1288 // The verifier checks that the sender is a subtype of the class in the I/MR operand.
1289 // The verifier also checks that the receiver is a subtype of the sender, if the sender is
1290 // a class. If the sender is an interface, the check has to be performed at runtime.
1291 InstanceKlass* sender = InstanceKlass::cast(current_klass);
1292 if (sender->is_interface() && recv.not_null()) {
1293 Klass* receiver_klass = recv->klass();
1294 if (!receiver_klass->is_subtype_of(sender)) {
1295 ResourceMark rm(THREAD);
1296 char buf[500];
1297 jio_snprintf(buf, sizeof(buf),
1298 "Receiver class %s must be the current class or a subtype of interface %s",
1299 receiver_klass->external_name(),
1300 sender->external_name());
1301 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), buf);
1302 }
1303 }
1304 }
1305
1306 // check if not static
1307 if (sel_method->is_static()) {
1308 ResourceMark rm(THREAD);
1309 stringStream ss;
1310 ss.print("Expecting non-static method '");
1311 resolved_method->print_external_name(&ss);
1312 ss.print("'");
1313 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1314 }
1315
1316 // check if abstract
1317 if (sel_method->is_abstract()) {
1318 ResourceMark rm(THREAD);
1319 stringStream ss;
1320 ss.print("'");
1321 Method::print_external_name(&ss, resolved_klass, sel_method->name(), sel_method->signature());
1322 ss.print("'");
1323 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1324 }
1325
1326 if (log_develop_is_enabled(Trace, itables)) {
1327 trace_method_resolution("invokespecial selected method: resolved-class:",
1328 resolved_klass, resolved_klass, sel_method(), true);
1329 }
1330
1331 // setup result
1332 result.set_static(resolved_klass, sel_method, CHECK);
1333 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1334 }
1335
1336 void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, Klass* receiver_klass,
1337 const LinkInfo& link_info,
1338 bool check_null_and_abstract, TRAPS) {
1339 Method* resolved_method = linktime_resolve_virtual_method(link_info, CHECK);
1340 runtime_resolve_virtual_method(result, methodHandle(THREAD, resolved_method),
1341 link_info.resolved_klass(),
1342 recv, receiver_klass,
1343 check_null_and_abstract,
1344 /*is_abstract_interpretation*/ false, CHECK);
1345 }
1346
1347 void LinkResolver::cds_resolve_virtual_call(CallInfo& result, const LinkInfo& link_info, TRAPS) {
1348 Method* resolved_method = linktime_resolve_virtual_method(link_info, CHECK);
1349 runtime_resolve_virtual_method(result, methodHandle(THREAD, resolved_method),
1350 link_info.resolved_klass(),
1351 Handle(), nullptr,
1352 /*check_null_and_abstract*/ false,
1353 /*is_abstract_interpretation*/ true, CHECK);
1354 }
1355
1356 // throws linktime exceptions
1357 Method* LinkResolver::linktime_resolve_virtual_method(const LinkInfo& link_info,
1358 TRAPS) {
1359 // normal method resolution
1360 Method* resolved_method = resolve_method(link_info, Bytecodes::_invokevirtual, CHECK_NULL);
1361
1362 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1363 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1364
1365 // check if private interface method
1366 Klass* resolved_klass = link_info.resolved_klass();
1367 Klass* current_klass = link_info.current_klass();
1368
1369 // This is impossible, if resolve_klass is an interface, we've thrown icce in resolve_method
1370 if (resolved_klass->is_interface() && resolved_method->is_private()) {
1371 ResourceMark rm(THREAD);
1372 stringStream ss;
1373 ss.print("private interface method requires invokespecial, not invokevirtual: method '");
1374 resolved_method->print_external_name(&ss);
1375 ss.print("', caller-class: %s",
1376 (current_klass == nullptr ? "<null>" : current_klass->internal_name()));
1377 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1378 }
1379
1380 // check if not static
1381 if (resolved_method->is_static()) {
1382 ResourceMark rm(THREAD);
1383 stringStream ss;
1384 ss.print("Expecting non-static method '");
1385 resolved_method->print_external_name(&ss);
1386 ss.print("'");
1387 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1388 }
1389
1390 if (log_develop_is_enabled(Trace, vtables)) {
1391 trace_method_resolution("invokevirtual resolved method: caller-class:",
1392 current_klass, resolved_klass, resolved_method, false);
1393 }
1394
1395 return resolved_method;
1396 }
1397
1398 // throws runtime exceptions
1399 void LinkResolver::runtime_resolve_virtual_method(CallInfo& result,
1400 const methodHandle& resolved_method,
1401 Klass* resolved_klass,
1402 Handle recv,
1403 Klass* recv_klass,
1404 bool check_null_and_abstract,
1405 bool is_abstract_interpretation,
1406 TRAPS) {
1407 // is_abstract_interpretation is true IFF CDS is resolving method references without
1408 // running any actual bytecode. Therefore, we don't have an actual recv/recv_klass, so
1409 // we cannot check the actual selected_method (which is not needed by CDS anyway).
1410
1411 // setup default return values
1412 int vtable_index = Method::invalid_vtable_index;
1413 methodHandle selected_method;
1414
1415 // runtime method resolution
1416 if (check_null_and_abstract && recv.is_null()) { // check if receiver exists
1417 THROW(vmSymbols::java_lang_NullPointerException());
1418 }
1419
1420 // Virtual methods cannot be resolved before its klass has been linked, for otherwise the Method*'s
1421 // has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since
1422 // a missing receiver might result in a bogus lookup.
1423 assert(resolved_method->method_holder()->is_linked(), "must be linked");
1424
1425 // do lookup based on receiver klass using the vtable index
1426 if (resolved_method->method_holder()->is_interface()) { // default or miranda method
1427 vtable_index = vtable_index_of_interface_method(resolved_klass, resolved_method);
1428 assert(vtable_index >= 0 , "we should have valid vtable index at this point");
1429
1430 if (!is_abstract_interpretation) {
1431 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1432 }
1433 } else {
1434 // at this point we are sure that resolved_method is virtual and not
1435 // a default or miranda method; therefore, it must have a valid vtable index.
1436 assert(!resolved_method->has_itable_index(), "");
1437 vtable_index = resolved_method->vtable_index();
1438 // We could get a negative vtable_index of nonvirtual_vtable_index for private
1439 // methods, or for final methods. Private methods never appear in the vtable
1440 // and never override other methods. As an optimization, final methods are
1441 // never put in the vtable, unless they override an existing method.
1442 // So if we do get nonvirtual_vtable_index, it means the selected method is the
1443 // resolved method, and it can never be changed by an override.
1444 if (vtable_index == Method::nonvirtual_vtable_index) {
1445 assert(resolved_method->can_be_statically_bound(), "cannot override this method");
1446 if (!is_abstract_interpretation) {
1447 selected_method = resolved_method;
1448 }
1449 } else {
1450 if (!is_abstract_interpretation) {
1451 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1452 }
1453 }
1454 }
1455
1456 if (!is_abstract_interpretation) {
1457 // check if method exists
1458 if (selected_method.is_null()) {
1459 throw_abstract_method_error(resolved_method, recv_klass, CHECK);
1460 }
1461
1462 // check if abstract
1463 if (check_null_and_abstract && selected_method->is_abstract()) {
1464 // Pass arguments for generating a verbose error message.
1465 throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK);
1466 }
1467
1468 if (log_develop_is_enabled(Trace, vtables)) {
1469 trace_method_resolution("invokevirtual selected method: receiver-class:",
1470 recv_klass, resolved_klass, selected_method(),
1471 false, vtable_index);
1472 }
1473 }
1474
1475 // setup result
1476 result.set_virtual(resolved_klass, resolved_method, selected_method, vtable_index, CHECK);
1477 if (selected_method.not_null()) {
1478 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1479 }
1480 }
1481
1482 void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, Klass* recv_klass,
1483 const LinkInfo& link_info,
1484 bool check_null_and_abstract, TRAPS) {
1485 // throws linktime exceptions
1486 Method* resolved_method = linktime_resolve_interface_method(link_info, CHECK);
1487 methodHandle mh(THREAD, resolved_method);
1488 runtime_resolve_interface_method(result, mh, link_info.resolved_klass(),
1489 recv, recv_klass, check_null_and_abstract,
1490 /*is_abstract_interpretation*/ false, CHECK);
1491 }
1492
1493 void LinkResolver::cds_resolve_interface_call(CallInfo& result, const LinkInfo& link_info, TRAPS) {
1494 Method* resolved_method = linktime_resolve_interface_method(link_info, CHECK);
1495 runtime_resolve_interface_method(result, methodHandle(THREAD, resolved_method), link_info.resolved_klass(),
1496 Handle(), nullptr,
1497 /*check_null_and_abstract*/ false,
1498 /*is_abstract_interpretation*/ true, CHECK);
1499 }
1500
1501 Method* LinkResolver::linktime_resolve_interface_method(const LinkInfo& link_info,
1502 TRAPS) {
1503 // normal interface method resolution
1504 Method* resolved_method = resolve_interface_method(link_info, Bytecodes::_invokeinterface, CHECK_NULL);
1505 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1506 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1507
1508 return resolved_method;
1509 }
1510
1511 // throws runtime exceptions
1512 void LinkResolver::runtime_resolve_interface_method(CallInfo& result,
1513 const methodHandle& resolved_method,
1514 Klass* resolved_klass,
1515 Handle recv,
1516 Klass* recv_klass,
1517 bool check_null_and_abstract,
1518 bool is_abstract_interpretation, TRAPS) {
1519 // is_abstract_interpretation -- see comments in runtime_resolve_virtual_method()
1520
1521 // check if receiver exists
1522 if (check_null_and_abstract && recv.is_null()) {
1523 THROW(vmSymbols::java_lang_NullPointerException());
1524 }
1525
1526 // check if receiver klass implements the resolved interface
1527 if (!is_abstract_interpretation && !recv_klass->is_subtype_of(resolved_klass)) {
1528 ResourceMark rm(THREAD);
1529 char buf[200];
1530 jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s",
1531 recv_klass->external_name(),
1532 resolved_klass->external_name());
1533 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1534 }
1535
1536 methodHandle selected_method;
1537
1538 if (!is_abstract_interpretation) {
1539 selected_method = resolved_method;
1540 }
1541
1542 // resolve the method in the receiver class, unless it is private
1543 if (!is_abstract_interpretation && !resolved_method->is_private()) {
1544 // do lookup based on receiver klass
1545 // This search must match the linktime preparation search for itable initialization
1546 // to correctly enforce loader constraints for interface method inheritance.
1547 // Private methods are skipped as the resolved method was not private.
1548 Method* method = lookup_instance_method_in_klasses(recv_klass,
1549 resolved_method->name(),
1550 resolved_method->signature(),
1551 Klass::PrivateLookupMode::skip);
1552 selected_method = methodHandle(THREAD, method);
1553
1554 if (selected_method.is_null() && !check_null_and_abstract) {
1555 // In theory this is a harmless placeholder value, but
1556 // in practice leaving in null affects the nsk default method tests.
1557 // This needs further study.
1558 selected_method = resolved_method;
1559 }
1560 // check if method exists
1561 if (selected_method.is_null()) {
1562 // Pass arguments for generating a verbose error message.
1563 throw_abstract_method_error(resolved_method, recv_klass, CHECK);
1564 }
1565 // check access
1566 // Throw Illegal Access Error if selected_method is not public.
1567 if (!selected_method->is_public()) {
1568 ResourceMark rm(THREAD);
1569 stringStream ss;
1570 ss.print("'");
1571 Method::print_external_name(&ss, recv_klass, selected_method->name(), selected_method->signature());
1572 ss.print("'");
1573 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
1574 }
1575 // check if abstract
1576 if (check_null_and_abstract && selected_method->is_abstract()) {
1577 throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK);
1578 }
1579 }
1580
1581 if (log_develop_is_enabled(Trace, itables)) {
1582 trace_method_resolution("invokeinterface selected method: receiver-class:",
1583 recv_klass, resolved_klass, selected_method(), true);
1584 }
1585 // setup result
1586 if (resolved_method->has_vtable_index()) {
1587 int vtable_index = resolved_method->vtable_index();
1588 log_develop_trace(itables)(" -- vtable index: %d", vtable_index);
1589 assert(is_abstract_interpretation || vtable_index == selected_method->vtable_index(), "sanity check");
1590 result.set_virtual(resolved_klass, resolved_method, selected_method, vtable_index, CHECK);
1591 } else if (resolved_method->has_itable_index()) {
1592 int itable_index = resolved_method->itable_index();
1593 log_develop_trace(itables)(" -- itable index: %d", itable_index);
1594 result.set_interface(resolved_klass, resolved_method, selected_method, itable_index, CHECK);
1595 } else {
1596 int index = resolved_method->vtable_index();
1597 log_develop_trace(itables)(" -- non itable/vtable index: %d", index);
1598 assert(index == Method::nonvirtual_vtable_index, "Oops hit another case!");
1599 assert(resolved_method->is_private() ||
1600 (resolved_method->is_final() && resolved_method->method_holder() == vmClasses::Object_klass()),
1601 "Should only have non-virtual invokeinterface for private or final-Object methods!");
1602 assert(resolved_method->can_be_statically_bound(), "Should only have non-virtual invokeinterface for statically bound methods!");
1603 // This sets up the nonvirtual form of "virtual" call (as needed for final and private methods)
1604 result.set_virtual(resolved_klass, resolved_method, resolved_method, index, CHECK);
1605 }
1606 if (!is_abstract_interpretation) {
1607 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1608 }
1609 }
1610
1611
1612 Method* LinkResolver::linktime_resolve_interface_method_or_null(
1613 const LinkInfo& link_info) {
1614 EXCEPTION_MARK;
1615 Method* method_result = linktime_resolve_interface_method(link_info, THREAD);
1616 if (HAS_PENDING_EXCEPTION) {
1617 CLEAR_PENDING_EXCEPTION;
1618 return nullptr;
1619 } else {
1620 return method_result;
1621 }
1622 }
1623
1624 Method* LinkResolver::linktime_resolve_virtual_method_or_null(
1625 const LinkInfo& link_info) {
1626 EXCEPTION_MARK;
1627 Method* method_result = linktime_resolve_virtual_method(link_info, THREAD);
1628 if (HAS_PENDING_EXCEPTION) {
1629 CLEAR_PENDING_EXCEPTION;
1630 return nullptr;
1631 } else {
1632 return method_result;
1633 }
1634 }
1635
1636 Method* LinkResolver::resolve_virtual_call_or_null(
1637 Klass* receiver_klass,
1638 const LinkInfo& link_info) {
1639 EXCEPTION_MARK;
1640 CallInfo info;
1641 resolve_virtual_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1642 if (HAS_PENDING_EXCEPTION) {
1643 CLEAR_PENDING_EXCEPTION;
1644 return nullptr;
1645 }
1646 return info.selected_method();
1647 }
1648
1649 Method* LinkResolver::resolve_interface_call_or_null(
1650 Klass* receiver_klass,
1651 const LinkInfo& link_info) {
1652 EXCEPTION_MARK;
1653 CallInfo info;
1654 resolve_interface_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1655 if (HAS_PENDING_EXCEPTION) {
1656 CLEAR_PENDING_EXCEPTION;
1657 return nullptr;
1658 }
1659 return info.selected_method();
1660 }
1661
1662 int LinkResolver::resolve_virtual_vtable_index(Klass* receiver_klass,
1663 const LinkInfo& link_info) {
1664 EXCEPTION_MARK;
1665 CallInfo info;
1666 resolve_virtual_call(info, Handle(), receiver_klass, link_info,
1667 /*check_null_or_abstract*/false, THREAD);
1668 if (HAS_PENDING_EXCEPTION) {
1669 CLEAR_PENDING_EXCEPTION;
1670 return Method::invalid_vtable_index;
1671 }
1672 return info.vtable_index();
1673 }
1674
1675 Method* LinkResolver::resolve_static_call_or_null(const LinkInfo& link_info) {
1676 EXCEPTION_MARK;
1677 CallInfo info;
1678 resolve_static_call(info, link_info, /*initialize_class*/false, THREAD);
1679 if (HAS_PENDING_EXCEPTION) {
1680 CLEAR_PENDING_EXCEPTION;
1681 return nullptr;
1682 }
1683 return info.selected_method();
1684 }
1685
1686 Method* LinkResolver::resolve_special_call_or_null(const LinkInfo& link_info) {
1687 EXCEPTION_MARK;
1688 CallInfo info;
1689 resolve_special_call(info, Handle(), link_info, THREAD);
1690 if (HAS_PENDING_EXCEPTION) {
1691 CLEAR_PENDING_EXCEPTION;
1692 return nullptr;
1693 }
1694 return info.selected_method();
1695 }
1696
1697
1698
1699 //------------------------------------------------------------------------------------------------------------------------
1700 // ConstantPool entries
1701
1702 void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) {
1703 switch (byte) {
1704 case Bytecodes::_invokestatic : resolve_invokestatic (result, pool, index, CHECK); break;
1705 case Bytecodes::_invokespecial : resolve_invokespecial (result, recv, pool, index, CHECK); break;
1706 case Bytecodes::_invokevirtual : resolve_invokevirtual (result, recv, pool, index, CHECK); break;
1707 case Bytecodes::_invokehandle : resolve_invokehandle (result, pool, index, CHECK); break;
1708 case Bytecodes::_invokedynamic : resolve_invokedynamic (result, pool, index, CHECK); break;
1709 case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break;
1710 default : break;
1711 }
1712 return;
1713 }
1714
1715 void LinkResolver::resolve_invoke(CallInfo& result, Handle& recv,
1716 const methodHandle& attached_method,
1717 Bytecodes::Code byte, TRAPS) {
1718 Klass* defc = attached_method->method_holder();
1719 Symbol* name = attached_method->name();
1720 Symbol* type = attached_method->signature();
1721 LinkInfo link_info(defc, name, type);
1722 switch(byte) {
1723 case Bytecodes::_invokevirtual:
1724 resolve_virtual_call(result, recv, recv->klass(), link_info,
1725 /*check_null_and_abstract=*/true, CHECK);
1726 break;
1727 case Bytecodes::_invokeinterface:
1728 resolve_interface_call(result, recv, recv->klass(), link_info,
1729 /*check_null_and_abstract=*/true, CHECK);
1730 break;
1731 case Bytecodes::_invokestatic:
1732 resolve_static_call(result, link_info, /*initialize_class=*/false, CHECK);
1733 break;
1734 case Bytecodes::_invokespecial:
1735 resolve_special_call(result, recv, link_info, CHECK);
1736 break;
1737 default:
1738 fatal("bad call: %s", Bytecodes::name(byte));
1739 break;
1740 }
1741 }
1742
1743 void LinkResolver::resolve_invokestatic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1744 LinkInfo link_info(pool, index, Bytecodes::_invokestatic, CHECK);
1745 resolve_static_call(result, link_info, /*initialize_class*/true, CHECK);
1746 }
1747
1748
1749 void LinkResolver::resolve_invokespecial(CallInfo& result, Handle recv,
1750 const constantPoolHandle& pool, int index, TRAPS) {
1751 LinkInfo link_info(pool, index, Bytecodes::_invokespecial, CHECK);
1752 resolve_special_call(result, recv, link_info, CHECK);
1753 }
1754
1755
1756 void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv,
1757 const constantPoolHandle& pool, int index,
1758 TRAPS) {
1759
1760 LinkInfo link_info(pool, index, Bytecodes::_invokevirtual, CHECK);
1761 Klass* recvrKlass = recv.is_null() ? (Klass*)nullptr : recv->klass();
1762 resolve_virtual_call(result, recv, recvrKlass, link_info, /*check_null_or_abstract*/true, CHECK);
1763 }
1764
1765
1766 void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, TRAPS) {
1767 LinkInfo link_info(pool, index, Bytecodes::_invokeinterface, CHECK);
1768 Klass* recvrKlass = recv.is_null() ? (Klass*)nullptr : recv->klass();
1769 resolve_interface_call(result, recv, recvrKlass, link_info, true, CHECK);
1770 }
1771
1772 bool LinkResolver::resolve_previously_linked_invokehandle(CallInfo& result, const LinkInfo& link_info, const constantPoolHandle& pool, int index, TRAPS) {
1773 ResolvedMethodEntry* method_entry = pool->cache()->resolved_method_entry_at(index);
1774 if (method_entry->method() != nullptr) {
1775 Klass* resolved_klass = link_info.resolved_klass();
1776 methodHandle method(THREAD, method_entry->method());
1777 Handle appendix(THREAD, pool->cache()->appendix_if_resolved(method_entry));
1778 result.set_handle(resolved_klass, method, appendix, CHECK_false);
1779 JFR_ONLY(Jfr::on_resolution(result, CHECK_false);)
1780 return true;
1781 } else {
1782 return false;
1783 }
1784 }
1785
1786 void LinkResolver::resolve_invokehandle(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1787
1788 PerfTraceTimedEvent timer(ClassLoader::perf_resolve_invokehandle_time(),
1789 ClassLoader::perf_resolve_invokehandle_count());
1790
1791 LinkInfo link_info(pool, index, Bytecodes::_invokehandle, CHECK);
1792 if (log_is_enabled(Info, methodhandles)) {
1793 ResourceMark rm(THREAD);
1794 log_info(methodhandles)("resolve_invokehandle %s %s", link_info.name()->as_C_string(),
1795 link_info.signature()->as_C_string());
1796 }
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 resolve_handle_call(result, link_info, CHECK);
1802 }
1803
1804 void LinkResolver::resolve_handle_call(CallInfo& result,
1805 const LinkInfo& link_info,
1806 TRAPS) {
1807 // JSR 292: this must be an implicitly generated method MethodHandle.invokeExact(*...) or similar
1808 Klass* resolved_klass = link_info.resolved_klass();
1809 assert(resolved_klass == vmClasses::MethodHandle_klass() ||
1810 resolved_klass == vmClasses::VarHandle_klass(), "");
1811 assert(MethodHandles::is_signature_polymorphic_name(link_info.name()), "");
1812 Handle resolved_appendix;
1813 Method* m = lookup_polymorphic_method(link_info, &resolved_appendix, CHECK);
1814 methodHandle resolved_method(THREAD, m);
1815
1816 if (link_info.check_access()) {
1817 Symbol* name = link_info.name();
1818 vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name);
1819 if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) {
1820 // Check if method can be accessed by the referring class.
1821 // MH.linkTo* invocations are not rewritten to invokehandle.
1822 assert(iid == vmIntrinsicID::_invokeBasic, "%s", vmIntrinsics::name_at(iid));
1823
1824 Klass* current_klass = link_info.current_klass();
1825 assert(current_klass != nullptr , "current_klass should not be null");
1826 check_method_accessability(current_klass,
1827 resolved_klass,
1828 resolved_method->method_holder(),
1829 resolved_method,
1830 CHECK);
1831 } else {
1832 // Java code is free to arbitrarily link signature-polymorphic invokers.
1833 assert(iid == vmIntrinsics::_invokeGeneric, "not an invoker: %s", vmIntrinsics::name_at(iid));
1834 assert(MethodHandles::is_signature_polymorphic_public_name(resolved_klass, name), "not public");
1835 }
1836 }
1837 result.set_handle(resolved_klass, resolved_method, resolved_appendix, CHECK);
1838 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1839 }
1840
1841 void LinkResolver::resolve_invokedynamic(CallInfo& result, const constantPoolHandle& pool, int indy_index, TRAPS) {
1842 PerfTraceTimedEvent timer(ClassLoader::perf_resolve_invokedynamic_time(),
1843 ClassLoader::perf_resolve_invokedynamic_count());
1844
1845 int pool_index = pool->resolved_indy_entry_at(indy_index)->constant_pool_index();
1846
1847 // Resolve the bootstrap specifier (BSM + optional arguments).
1848 BootstrapInfo bootstrap_specifier(pool, pool_index, indy_index);
1849
1850 // Check if CallSite has been bound already or failed already, and short circuit:
1851 {
1852 bool is_done = bootstrap_specifier.resolve_previously_linked_invokedynamic(result, CHECK);
1853 if (is_done) return;
1854 }
1855
1856 // The initial step in Call Site Specifier Resolution is to resolve the symbolic
1857 // reference to a method handle which will be the bootstrap method for a dynamic
1858 // call site. If resolution for the java.lang.invoke.MethodHandle for the bootstrap
1859 // method fails, then a MethodHandleInError is stored at the corresponding bootstrap
1860 // method's CP index for the CONSTANT_MethodHandle_info.
1861 // Any subsequent invokedynamic instruction which shares
1862 // this bootstrap method will encounter the resolution of MethodHandleInError.
1863
1864 resolve_dynamic_call(result, bootstrap_specifier, CHECK);
1865
1866 LogTarget(Debug, methodhandles, indy) lt_indy;
1867 if (lt_indy.is_enabled()) {
1868 LogStream ls(lt_indy);
1869 bootstrap_specifier.print_msg_on(&ls, "resolve_invokedynamic");
1870 }
1871
1872 // The returned linkage result is provisional up to the moment
1873 // the interpreter or runtime performs a serialized check of
1874 // the relevant ResolvedIndyEntry::method field. This is done by the caller
1875 // of this method, via CPC::set_dynamic_call, which uses
1876 // an ObjectLocker to do the final serialization of updates
1877 // to ResolvedIndyEntry state, including method.
1878
1879 // Log dynamic info to CDS classlist.
1880 ArchiveUtils::log_to_classlist(&bootstrap_specifier, CHECK);
1881 }
1882
1883 void LinkResolver::resolve_dynamic_call(CallInfo& result,
1884 BootstrapInfo& bootstrap_specifier,
1885 TRAPS) {
1886 // JSR 292: this must resolve to an implicitly generated method
1887 // such as MH.linkToCallSite(*...) or some other call-site shape.
1888 // The appendix argument is likely to be a freshly-created CallSite.
1889 // It may also be a MethodHandle from an unwrapped ConstantCallSite,
1890 // or any other reference. The resolved_method as well as the appendix
1891 // are both recorded together via CallInfo::set_handle.
1892 SystemDictionary::invoke_bootstrap_method(bootstrap_specifier, THREAD);
1893 Exceptions::wrap_dynamic_exception(/* is_indy */ true, THREAD);
1894
1895 if (HAS_PENDING_EXCEPTION) {
1896 if (!PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass())) {
1897 // Let any random low-level IE or SOE or OOME just bleed through.
1898 // Basically we pretend that the bootstrap method was never called,
1899 // if it fails this way: We neither record a successful linkage,
1900 // nor do we memorize a LE for posterity.
1901 return;
1902 }
1903 // JVMS 5.4.3 says: If an attempt by the Java Virtual Machine to resolve
1904 // a symbolic reference fails because an error is thrown that is an
1905 // instance of LinkageError (or a subclass), then subsequent attempts to
1906 // resolve the reference always fail with the same error that was thrown
1907 // as a result of the initial resolution attempt.
1908 bool recorded_res_status = bootstrap_specifier.save_and_throw_indy_exc(CHECK);
1909 if (!recorded_res_status) {
1910 // Another thread got here just before we did. So, either use the method
1911 // that it resolved or throw the LinkageError exception that it threw.
1912 bool is_done = bootstrap_specifier.resolve_previously_linked_invokedynamic(result, CHECK);
1913 if (is_done) return;
1914 }
1915 assert(bootstrap_specifier.pool()->resolved_indy_entry_at(bootstrap_specifier.indy_index())->resolution_failed(),
1916 "Resolution should have failed");
1917 }
1918
1919 bootstrap_specifier.resolve_newly_linked_invokedynamic(result, CHECK);
1920 // Exceptions::wrap_dynamic_exception not used because
1921 // set_handle doesn't throw linkage errors
1922 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1923 }
1924
1925 // Selected method is abstract.
1926 void LinkResolver::throw_abstract_method_error(const methodHandle& resolved_method,
1927 const methodHandle& selected_method,
1928 Klass *recv_klass, TRAPS) {
1929 Klass *resolved_klass = resolved_method->method_holder();
1930 ResourceMark rm(THREAD);
1931 stringStream ss;
1932
1933 if (recv_klass != nullptr) {
1934 ss.print("Receiver class %s does not define or inherit an "
1935 "implementation of the",
1936 recv_klass->external_name());
1937 } else {
1938 ss.print("Missing implementation of");
1939 }
1940
1941 assert(resolved_method.not_null(), "Sanity");
1942 ss.print(" resolved method '%s%s",
1943 resolved_method->is_abstract() ? "abstract " : "",
1944 resolved_method->is_private() ? "private " : "");
1945 resolved_method->signature()->print_as_signature_external_return_type(&ss);
1946 ss.print(" %s(", resolved_method->name()->as_C_string());
1947 resolved_method->signature()->print_as_signature_external_parameters(&ss);
1948 ss.print(")' of %s %s.",
1949 resolved_klass->external_kind(),
1950 resolved_klass->external_name());
1951
1952 if (selected_method.not_null() && !(resolved_method == selected_method)) {
1953 ss.print(" Selected method is '%s%s",
1954 selected_method->is_abstract() ? "abstract " : "",
1955 selected_method->is_private() ? "private " : "");
1956 selected_method->print_external_name(&ss);
1957 ss.print("'.");
1958 }
1959
1960 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1961 }