1 /*
2 * Copyright (c) 1997, 2023, 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/defaultMethods.hpp"
28 #include "classfile/javaClasses.hpp"
29 #include "classfile/systemDictionary.hpp"
30 #include "classfile/vmClasses.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "compiler/compilationPolicy.hpp"
33 #include "compiler/compileBroker.hpp"
34 #include "gc/shared/collectedHeap.inline.hpp"
35 #include "interpreter/bootstrapInfo.hpp"
36 #include "interpreter/bytecode.hpp"
37 #include "interpreter/interpreterRuntime.hpp"
38 #include "interpreter/linkResolver.hpp"
39 #include "jvm.h"
40 #include "logging/log.hpp"
41 #include "logging/logStream.hpp"
42 #include "memory/resourceArea.hpp"
43 #include "oops/constantPool.inline.hpp"
44 #include "oops/cpCache.inline.hpp"
45 #include "oops/instanceKlass.inline.hpp"
46 #include "oops/klass.inline.hpp"
47 #include "oops/method.inline.hpp"
48 #include "oops/objArrayKlass.hpp"
49 #include "oops/objArrayOop.hpp"
50 #include "oops/oop.inline.hpp"
51 #include "oops/resolvedIndyEntry.hpp"
52 #include "oops/symbolHandle.hpp"
53 #include "prims/methodHandles.hpp"
54 #include "runtime/fieldDescriptor.inline.hpp"
55 #include "runtime/frame.inline.hpp"
56 #include "runtime/handles.inline.hpp"
57 #include "runtime/javaThread.hpp"
58 #include "runtime/reflection.hpp"
59 #include "runtime/safepointVerifiers.hpp"
60 #include "runtime/sharedRuntime.hpp"
61 #include "runtime/signature.hpp"
62 #include "runtime/vmThread.hpp"
63 #include "utilities/macros.hpp"
64 #if INCLUDE_JFR
65 #include "jfr/jfr.hpp"
66 #endif
67
68 //------------------------------------------------------------------------------------------------------------------------
69 // Implementation of CallInfo
70
71
72 void CallInfo::set_static(Klass* resolved_klass, const methodHandle& resolved_method, TRAPS) {
73 int vtable_index = Method::nonvirtual_vtable_index;
74 set_common(resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK);
75 }
76
77
78 void CallInfo::set_interface(Klass* resolved_klass,
79 const methodHandle& resolved_method,
80 const methodHandle& selected_method,
81 int itable_index, TRAPS) {
82 // This is only called for interface methods. If the resolved_method
83 // comes from java/lang/Object, it can be the subject of a virtual call, so
84 // we should pick the vtable index from the resolved method.
85 // In that case, the caller must call set_virtual instead of set_interface.
86 assert(resolved_method->method_holder()->is_interface(), "");
87 assert(itable_index == resolved_method()->itable_index(), "");
88 set_common(resolved_klass, resolved_method, selected_method, CallInfo::itable_call, itable_index, CHECK);
89 }
90
91 void CallInfo::set_virtual(Klass* resolved_klass,
92 const methodHandle& resolved_method,
93 const methodHandle& selected_method,
94 int vtable_index, TRAPS) {
95 assert(vtable_index >= 0 || vtable_index == Method::nonvirtual_vtable_index, "valid index");
96 assert(vtable_index < 0 || !resolved_method->has_vtable_index() || vtable_index == resolved_method->vtable_index(), "");
97 CallKind kind = (vtable_index >= 0 && !resolved_method->can_be_statically_bound() ? CallInfo::vtable_call : CallInfo::direct_call);
98 set_common(resolved_klass, resolved_method, selected_method, kind, vtable_index, CHECK);
99 assert(!resolved_method->is_compiled_lambda_form(), "these must be handled via an invokehandle call");
100 }
101
102 void CallInfo::set_handle(Klass* resolved_klass,
103 const methodHandle& resolved_method,
104 Handle resolved_appendix, TRAPS) {
105 guarantee(resolved_method.not_null(), "resolved method is null");
106 assert(resolved_method->intrinsic_id() == vmIntrinsics::_invokeBasic ||
107 resolved_method->is_compiled_lambda_form(),
108 "linkMethod must return one of these");
109 int vtable_index = Method::nonvirtual_vtable_index;
110 assert(!resolved_method->has_vtable_index(), "");
111 set_common(resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK);
112 _resolved_appendix = resolved_appendix;
113 }
114
115 void CallInfo::set_common(Klass* resolved_klass,
116 const methodHandle& resolved_method,
117 const methodHandle& selected_method,
118 CallKind kind,
119 int index,
120 TRAPS) {
121 assert(resolved_method->signature() == selected_method->signature(), "signatures must correspond");
122 _resolved_klass = resolved_klass;
123 _resolved_method = resolved_method;
124 _selected_method = selected_method;
125 _call_kind = kind;
126 _call_index = index;
127 _resolved_appendix = Handle();
128 DEBUG_ONLY(verify()); // verify before making side effects
129
130 CompilationPolicy::compile_if_required(selected_method, THREAD);
131 }
132
133 // utility query for unreflecting a method
134 CallInfo::CallInfo(Method* resolved_method, Klass* resolved_klass, TRAPS) {
135 Klass* resolved_method_holder = resolved_method->method_holder();
136 if (resolved_klass == nullptr) { // 2nd argument defaults to holder of 1st
137 resolved_klass = resolved_method_holder;
138 }
139 _resolved_klass = resolved_klass;
140 _resolved_method = methodHandle(THREAD, resolved_method);
141 _selected_method = methodHandle(THREAD, resolved_method);
142 // classify:
143 CallKind kind = CallInfo::unknown_kind;
144 int index = resolved_method->vtable_index();
145 if (resolved_method->can_be_statically_bound()) {
146 kind = CallInfo::direct_call;
147 } else if (!resolved_method_holder->is_interface()) {
148 // Could be an Object method inherited into an interface, but still a vtable call.
149 kind = CallInfo::vtable_call;
150 } else if (!resolved_klass->is_interface()) {
151 // A default or miranda method. Compute the vtable index.
152 index = LinkResolver::vtable_index_of_interface_method(resolved_klass, _resolved_method);
153 assert(index >= 0 , "we should have valid vtable index at this point");
154
155 kind = CallInfo::vtable_call;
156 } else if (resolved_method->has_vtable_index()) {
157 // Can occur if an interface redeclares a method of Object.
158
159 #ifdef ASSERT
160 // Ensure that this is really the case.
161 Klass* object_klass = vmClasses::Object_klass();
162 Method * object_resolved_method = object_klass->vtable().method_at(index);
163 assert(object_resolved_method->name() == resolved_method->name(),
164 "Object and interface method names should match at vtable index %d, %s != %s",
165 index, object_resolved_method->name()->as_C_string(), resolved_method->name()->as_C_string());
166 assert(object_resolved_method->signature() == resolved_method->signature(),
167 "Object and interface method signatures should match at vtable index %d, %s != %s",
168 index, object_resolved_method->signature()->as_C_string(), resolved_method->signature()->as_C_string());
169 #endif // ASSERT
170
171 kind = CallInfo::vtable_call;
172 } else {
173 // A regular interface call.
174 kind = CallInfo::itable_call;
175 index = resolved_method->itable_index();
176 }
177 assert(index == Method::nonvirtual_vtable_index || index >= 0, "bad index %d", index);
178 _call_kind = kind;
179 _call_index = index;
180 _resolved_appendix = Handle();
181 // Find or create a ResolvedMethod instance for this Method*
182 set_resolved_method_name(CHECK);
183
184 DEBUG_ONLY(verify());
185 }
186
187 void CallInfo::set_resolved_method_name(TRAPS) {
188 assert(_resolved_method() != nullptr, "Should already have a Method*");
189 oop rmethod_name = java_lang_invoke_ResolvedMethodName::find_resolved_method(_resolved_method, CHECK);
190 _resolved_method_name = Handle(THREAD, rmethod_name);
191 }
192
193 #ifdef ASSERT
194 void CallInfo::verify() {
195 switch (call_kind()) { // the meaning and allowed value of index depends on kind
196 case CallInfo::direct_call:
197 if (_call_index == Method::nonvirtual_vtable_index) break;
198 // else fall through to check vtable index:
199 case CallInfo::vtable_call:
200 assert(resolved_klass()->verify_vtable_index(_call_index), "");
201 break;
202 case CallInfo::itable_call:
203 assert(resolved_method()->method_holder()->verify_itable_index(_call_index), "");
204 break;
205 case CallInfo::unknown_kind:
206 assert(call_kind() != CallInfo::unknown_kind, "CallInfo must be set");
207 break;
208 default:
209 fatal("Unexpected call kind %d", call_kind());
210 }
211 }
212 #endif // ASSERT
213
214 #ifndef PRODUCT
215 void CallInfo::print() {
216 ResourceMark rm;
217 const char* kindstr;
218 switch (_call_kind) {
219 case direct_call: kindstr = "direct"; break;
220 case vtable_call: kindstr = "vtable"; break;
221 case itable_call: kindstr = "itable"; break;
222 default : kindstr = "unknown"; break;
223 }
224 tty->print_cr("Call %s@%d %s", kindstr, _call_index,
225 _resolved_method.is_null() ? "(none)" : _resolved_method->name_and_sig_as_C_string());
226 }
227 #endif
228
229 //------------------------------------------------------------------------------------------------------------------------
230 // Implementation of LinkInfo
231
232 LinkInfo::LinkInfo(const constantPoolHandle& pool, int index, const methodHandle& current_method, Bytecodes::Code code, TRAPS) {
233 // resolve klass
234 _resolved_klass = pool->klass_ref_at(index, code, CHECK);
235
236 // Get name, signature, and static klass
237 _name = pool->name_ref_at(index, code);
238 _signature = pool->signature_ref_at(index, code);
239 _tag = pool->tag_ref_at(index, code);
240 _current_klass = pool->pool_holder();
241 _current_method = current_method;
242
243 // Coming from the constant pool always checks access
244 _check_access = true;
245 _check_loader_constraints = true;
246 }
247
248 LinkInfo::LinkInfo(const constantPoolHandle& pool, int index, Bytecodes::Code code, TRAPS) {
249 // resolve klass
250 _resolved_klass = pool->klass_ref_at(index, code, CHECK);
251
252 // Get name, signature, and static klass
253 _name = pool->name_ref_at(index, code);
254 _signature = pool->signature_ref_at(index, code);
255 _tag = pool->tag_ref_at(index, code);
256 _current_klass = pool->pool_holder();
257 _current_method = methodHandle();
258
259 // Coming from the constant pool always checks access
260 _check_access = true;
261 _check_loader_constraints = true;
262 }
263
264 #ifndef PRODUCT
265 void LinkInfo::print() {
266 ResourceMark rm;
267 tty->print_cr("Link resolved_klass=%s name=%s signature=%s current_klass=%s check_access=%s check_loader_constraints=%s",
268 _resolved_klass->name()->as_C_string(),
269 _name->as_C_string(),
270 _signature->as_C_string(),
271 _current_klass == nullptr ? "(none)" : _current_klass->name()->as_C_string(),
272 _check_access ? "true" : "false",
273 _check_loader_constraints ? "true" : "false");
274
275 }
276 #endif // PRODUCT
277 //------------------------------------------------------------------------------------------------------------------------
278 // Klass resolution
279
280 void LinkResolver::check_klass_accessibility(Klass* ref_klass, Klass* sel_klass, TRAPS) {
281 Klass* base_klass = sel_klass;
282 if (sel_klass->is_objArray_klass()) {
283 base_klass = ObjArrayKlass::cast(sel_klass)->bottom_klass();
284 }
285 // The element type could be a typeArray - we only need the access
286 // check if it is a reference to another class.
287 if (!base_klass->is_instance_klass()) {
288 return; // no relevant check to do
289 }
290
291 Reflection::VerifyClassAccessResults vca_result =
292 Reflection::verify_class_access(ref_klass, InstanceKlass::cast(base_klass), true);
293 if (vca_result != Reflection::ACCESS_OK) {
294 ResourceMark rm(THREAD);
295 char* msg = Reflection::verify_class_access_msg(ref_klass,
296 InstanceKlass::cast(base_klass),
297 vca_result);
298 bool same_module = (base_klass->module() == ref_klass->module());
299 if (msg == nullptr) {
300 Exceptions::fthrow(
301 THREAD_AND_LOCATION,
302 vmSymbols::java_lang_IllegalAccessError(),
303 "failed to access class %s from class %s (%s%s%s)",
304 base_klass->external_name(),
305 ref_klass->external_name(),
306 (same_module) ? base_klass->joint_in_module_of_loader(ref_klass) : base_klass->class_in_module_of_loader(),
307 (same_module) ? "" : "; ",
308 (same_module) ? "" : ref_klass->class_in_module_of_loader());
309 } else {
310 // Use module specific message returned by verify_class_access_msg().
311 Exceptions::fthrow(
312 THREAD_AND_LOCATION,
313 vmSymbols::java_lang_IllegalAccessError(),
314 "%s", msg);
315 }
316 }
317 }
318
319 //------------------------------------------------------------------------------------------------------------------------
320 // Method resolution
321 //
322 // According to JVM spec. $5.4.3c & $5.4.3d
323
324 // Look up method in klasses, including static methods
325 // Then look up local default methods
326 Method* LinkResolver::lookup_method_in_klasses(const LinkInfo& link_info,
327 bool checkpolymorphism,
328 bool in_imethod_resolve) {
329 NoSafepointVerifier nsv; // Method* returned may not be reclaimed
330
331 Klass* klass = link_info.resolved_klass();
332 Symbol* name = link_info.name();
333 Symbol* signature = link_info.signature();
334
335 // Ignore overpasses so statics can be found during resolution
336 Method* result = klass->uncached_lookup_method(name, signature, Klass::OverpassLookupMode::skip);
337
338 if (klass->is_array_klass()) {
339 // Only consider klass and super klass for arrays
340 return result;
341 }
342
343 InstanceKlass* ik = InstanceKlass::cast(klass);
344
345 // JDK 8, JVMS 5.4.3.4: Interface method resolution should
346 // ignore static and non-public methods of java.lang.Object,
347 // like clone and finalize.
348 if (in_imethod_resolve &&
349 result != nullptr &&
350 ik->is_interface() &&
351 (result->is_static() || !result->is_public()) &&
352 result->method_holder() == vmClasses::Object_klass()) {
353 result = nullptr;
354 }
355
356 // Before considering default methods, check for an overpass in the
357 // current class if a method has not been found.
358 if (result == nullptr) {
359 result = ik->find_method(name, signature);
360 }
361
362 if (result == nullptr) {
363 Array<Method*>* default_methods = ik->default_methods();
364 if (default_methods != nullptr) {
365 result = InstanceKlass::find_method(default_methods, name, signature);
366 }
367 }
368
369 if (checkpolymorphism && result != nullptr) {
370 vmIntrinsics::ID iid = result->intrinsic_id();
371 if (MethodHandles::is_signature_polymorphic(iid)) {
372 // Do not link directly to these. The VM must produce a synthetic one using lookup_polymorphic_method.
373 return nullptr;
374 }
375 }
376 return result;
377 }
378
379 // returns first instance method
380 // Looks up method in classes, then looks up local default methods
381 Method* LinkResolver::lookup_instance_method_in_klasses(Klass* klass,
382 Symbol* name,
383 Symbol* signature,
384 Klass::PrivateLookupMode private_mode) {
385 Method* result = klass->uncached_lookup_method(name, signature, Klass::OverpassLookupMode::find, private_mode);
386
387 while (result != nullptr && result->is_static() && result->method_holder()->super() != nullptr) {
388 Klass* super_klass = result->method_holder()->super();
389 result = super_klass->uncached_lookup_method(name, signature, Klass::OverpassLookupMode::find, private_mode);
390 }
391
392 if (klass->is_array_klass()) {
393 // Only consider klass and super klass for arrays
394 return result;
395 }
396
397 if (result == nullptr) {
398 Array<Method*>* default_methods = InstanceKlass::cast(klass)->default_methods();
399 if (default_methods != nullptr) {
400 result = InstanceKlass::find_method(default_methods, name, signature);
401 assert(result == nullptr || !result->is_static(), "static defaults not allowed");
402 }
403 }
404 return result;
405 }
406
407 int LinkResolver::vtable_index_of_interface_method(Klass* klass, const methodHandle& resolved_method) {
408 InstanceKlass* ik = InstanceKlass::cast(klass);
409 return ik->vtable_index_of_interface_method(resolved_method());
410 }
411
412 Method* LinkResolver::lookup_method_in_interfaces(const LinkInfo& cp_info) {
413 InstanceKlass *ik = InstanceKlass::cast(cp_info.resolved_klass());
414
415 // Specify 'true' in order to skip default methods when searching the
416 // interfaces. Function lookup_method_in_klasses() already looked for
417 // the method in the default methods table.
418 return ik->lookup_method_in_all_interfaces(cp_info.name(), cp_info.signature(), Klass::DefaultsLookupMode::skip);
419 }
420
421 Method* LinkResolver::lookup_polymorphic_method(const LinkInfo& link_info,
422 Handle *appendix_result_or_null,
423 TRAPS) {
424 ResourceMark rm(THREAD);
425 Klass* klass = link_info.resolved_klass();
426 Symbol* name = link_info.name();
427 Symbol* full_signature = link_info.signature();
428 LogTarget(Info, methodhandles) lt_mh;
429
430 vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name);
431 log_info(methodhandles)("lookup_polymorphic_method iid=%s %s.%s%s",
432 vmIntrinsics::name_at(iid), klass->external_name(),
433 name->as_C_string(), full_signature->as_C_string());
434 if ((klass == vmClasses::MethodHandle_klass() ||
435 klass == vmClasses::VarHandle_klass()) &&
436 iid != vmIntrinsics::_none) {
437 if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) {
438 // Most of these do not need an up-call to Java to resolve, so can be done anywhere.
439 // Do not erase last argument type (MemberName) if it is a static linkTo method.
440 bool keep_last_arg = MethodHandles::is_signature_polymorphic_static(iid);
441 TempNewSymbol basic_signature =
442 MethodHandles::lookup_basic_type_signature(full_signature, keep_last_arg);
443 log_info(methodhandles)("lookup_polymorphic_method %s %s => basic %s",
444 name->as_C_string(),
445 full_signature->as_C_string(),
446 basic_signature->as_C_string());
447 Method* result = SystemDictionary::find_method_handle_intrinsic(iid,
448 basic_signature,
449 CHECK_NULL);
450 if (result != nullptr) {
451 assert(result->is_method_handle_intrinsic(), "MH.invokeBasic or MH.linkTo* intrinsic");
452 assert(result->intrinsic_id() != vmIntrinsics::_invokeGeneric, "wrong place to find this");
453 assert(basic_signature == result->signature(), "predict the result signature");
454 if (lt_mh.is_enabled()) {
455 LogStream ls(lt_mh);
456 ls.print("lookup_polymorphic_method => intrinsic ");
457 result->print_on(&ls);
458 }
459 }
460 return result;
461 } else if (iid == vmIntrinsics::_invokeGeneric
462 && THREAD->can_call_java()
463 && appendix_result_or_null != nullptr) {
464 // This is a method with type-checking semantics.
465 // We will ask Java code to spin an adapter method for it.
466 if (!MethodHandles::enabled()) {
467 // Make sure the Java part of the runtime has been booted up.
468 Klass* natives = vmClasses::MethodHandleNatives_klass();
469 if (natives == nullptr || InstanceKlass::cast(natives)->is_not_initialized()) {
470 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_invoke_MethodHandleNatives(),
471 Handle(),
472 Handle(),
473 true,
474 CHECK_NULL);
475 }
476 }
477
478 Handle appendix;
479 Method* result = SystemDictionary::find_method_handle_invoker(klass,
480 name,
481 full_signature,
482 link_info.current_klass(),
483 &appendix,
484 CHECK_NULL);
485 if (lt_mh.is_enabled()) {
486 LogStream ls(lt_mh);
487 ls.print("lookup_polymorphic_method => (via Java) ");
488 result->print_on(&ls);
489 ls.print(" lookup_polymorphic_method => appendix = ");
490 appendix.is_null() ? ls.print_cr("(none)") : appendix->print_on(&ls);
491 }
492 if (result != nullptr) {
493 #ifdef ASSERT
494 ResourceMark rm(THREAD);
495
496 TempNewSymbol basic_signature =
497 MethodHandles::lookup_basic_type_signature(full_signature);
498 int actual_size_of_params = result->size_of_parameters();
499 int expected_size_of_params = ArgumentSizeComputer(basic_signature).size();
500 // +1 for MethodHandle.this, +1 for trailing MethodType
501 if (!MethodHandles::is_signature_polymorphic_static(iid)) expected_size_of_params += 1;
502 if (appendix.not_null()) expected_size_of_params += 1;
503 if (actual_size_of_params != expected_size_of_params) {
504 tty->print_cr("*** basic_signature=%s", basic_signature->as_C_string());
505 tty->print_cr("*** result for %s: ", vmIntrinsics::name_at(iid));
506 result->print();
507 }
508 assert(actual_size_of_params == expected_size_of_params,
509 "%d != %d", actual_size_of_params, expected_size_of_params);
510 #endif //ASSERT
511
512 assert(appendix_result_or_null != nullptr, "");
513 (*appendix_result_or_null) = appendix;
514 }
515 return result;
516 }
517 }
518 return nullptr;
519 }
520
521 static void print_nest_host_error_on(stringStream* ss, Klass* ref_klass, Klass* sel_klass) {
522 assert(ref_klass->is_instance_klass(), "must be");
523 assert(sel_klass->is_instance_klass(), "must be");
524 InstanceKlass* ref_ik = InstanceKlass::cast(ref_klass);
525 InstanceKlass* sel_ik = InstanceKlass::cast(sel_klass);
526 const char* nest_host_error_1 = ref_ik->nest_host_error();
527 const char* nest_host_error_2 = sel_ik->nest_host_error();
528 if (nest_host_error_1 != nullptr || nest_host_error_2 != nullptr) {
529 ss->print(", (%s%s%s)",
530 (nest_host_error_1 != nullptr) ? nest_host_error_1 : "",
531 (nest_host_error_1 != nullptr && nest_host_error_2 != nullptr) ? ", " : "",
532 (nest_host_error_2 != nullptr) ? nest_host_error_2 : "");
533 }
534 }
535
536 void LinkResolver::check_method_accessability(Klass* ref_klass,
537 Klass* resolved_klass,
538 Klass* sel_klass,
539 const methodHandle& sel_method,
540 TRAPS) {
541
542 AccessFlags flags = sel_method->access_flags();
543
544 // Special case: arrays always override "clone". JVMS 2.15.
545 // If the resolved klass is an array class, and the declaring class
546 // is java.lang.Object and the method is "clone", set the flags
547 // to public.
548 //
549 // We'll check for the method name first, as that's most likely
550 // to be false (so we'll short-circuit out of these tests).
551 if (sel_method->name() == vmSymbols::clone_name() &&
552 sel_klass == vmClasses::Object_klass() &&
553 resolved_klass->is_array_klass()) {
554 // We need to change "protected" to "public".
555 assert(flags.is_protected(), "clone not protected?");
556 jint new_flags = flags.as_int();
557 new_flags = new_flags & (~JVM_ACC_PROTECTED);
558 new_flags = new_flags | JVM_ACC_PUBLIC;
559 flags.set_flags(new_flags);
560 }
561 // assert(extra_arg_result_or_null != nullptr, "must be able to return extra argument");
562
563 bool can_access = Reflection::verify_member_access(ref_klass,
564 resolved_klass,
565 sel_klass,
566 flags,
567 true, false, CHECK);
568 // Any existing exceptions that may have been thrown
569 // have been allowed to propagate.
570 if (!can_access) {
571 ResourceMark rm(THREAD);
572 stringStream ss;
573 bool same_module = (sel_klass->module() == ref_klass->module());
574 ss.print("class %s tried to access %s%s%smethod '%s' (%s%s%s)",
575 ref_klass->external_name(),
576 sel_method->is_abstract() ? "abstract " : "",
577 sel_method->is_protected() ? "protected " : "",
578 sel_method->is_private() ? "private " : "",
579 sel_method->external_name(),
580 (same_module) ? ref_klass->joint_in_module_of_loader(sel_klass) : ref_klass->class_in_module_of_loader(),
581 (same_module) ? "" : "; ",
582 (same_module) ? "" : sel_klass->class_in_module_of_loader()
583 );
584
585 // For private access see if there was a problem with nest host
586 // resolution, and if so report that as part of the message.
587 if (sel_method->is_private()) {
588 print_nest_host_error_on(&ss, ref_klass, sel_klass);
589 }
590
591 Exceptions::fthrow(THREAD_AND_LOCATION,
592 vmSymbols::java_lang_IllegalAccessError(),
593 "%s",
594 ss.as_string()
595 );
596 return;
597 }
598 }
599
600 void LinkResolver::resolve_continuation_enter(CallInfo& callinfo, TRAPS) {
601 Klass* resolved_klass = vmClasses::Continuation_klass();
602 Symbol* method_name = vmSymbols::enter_name();
603 Symbol* method_signature = vmSymbols::continuationEnter_signature();
604 Klass* current_klass = resolved_klass;
605 LinkInfo link_info(resolved_klass, method_name, method_signature, current_klass);
606 Method* resolved_method = resolve_method(link_info, Bytecodes::_invokestatic, CHECK);
607 callinfo.set_static(resolved_klass, methodHandle(THREAD, resolved_method), CHECK);
608 }
609
610 Method* LinkResolver::resolve_method_statically(Bytecodes::Code code,
611 const constantPoolHandle& pool, int index, TRAPS) {
612 // This method is used only
613 // (1) in C2 from InlineTree::ok_to_inline (via ciMethod::check_call),
614 // and
615 // (2) in Bytecode_invoke::static_target
616 // It appears to fail when applied to an invokeinterface call site.
617 // FIXME: Remove this method and ciMethod::check_call; refactor to use the other LinkResolver entry points.
618 // resolve klass
619 if (code == Bytecodes::_invokedynamic) {
620 Klass* resolved_klass = vmClasses::MethodHandle_klass();
621 Symbol* method_name = vmSymbols::invoke_name();
622 Symbol* method_signature = pool->signature_ref_at(index, code);
623 Klass* current_klass = pool->pool_holder();
624 LinkInfo link_info(resolved_klass, method_name, method_signature, current_klass);
625 return resolve_method(link_info, code, THREAD);
626 }
627
628 LinkInfo link_info(pool, index, methodHandle(), code, CHECK_NULL);
629 Klass* resolved_klass = link_info.resolved_klass();
630
631 if (pool->has_preresolution()
632 || ((resolved_klass == vmClasses::MethodHandle_klass() || resolved_klass == vmClasses::VarHandle_klass()) &&
633 MethodHandles::is_signature_polymorphic_name(resolved_klass, link_info.name()))) {
634 Method* result = ConstantPool::method_at_if_loaded(pool, index);
635 if (result != nullptr) {
636 return result;
637 }
638 }
639
640 if (code == Bytecodes::_invokeinterface) {
641 return resolve_interface_method(link_info, code, THREAD);
642 } else if (code == Bytecodes::_invokevirtual) {
643 return resolve_method(link_info, code, THREAD);
644 } else if (!resolved_klass->is_interface()) {
645 return resolve_method(link_info, code, THREAD);
646 } else {
647 return resolve_interface_method(link_info, code, THREAD);
648 }
649 }
650
651 // Check and print a loader constraint violation message for method or interface method
652 void LinkResolver::check_method_loader_constraints(const LinkInfo& link_info,
653 const methodHandle& resolved_method,
654 const char* method_type, TRAPS) {
655 Handle current_loader(THREAD, link_info.current_klass()->class_loader());
656 Handle resolved_loader(THREAD, resolved_method->method_holder()->class_loader());
657
658 ResourceMark rm(THREAD);
659 Symbol* failed_type_symbol =
660 SystemDictionary::check_signature_loaders(link_info.signature(),
661 /*klass_being_linked*/ nullptr, // We are not linking class
662 current_loader,
663 resolved_loader, true);
664 if (failed_type_symbol != nullptr) {
665 Klass* current_class = link_info.current_klass();
666 ClassLoaderData* current_loader_data = current_class->class_loader_data();
667 assert(current_loader_data != nullptr, "current class has no class loader data");
668 Klass* resolved_method_class = resolved_method->method_holder();
669 ClassLoaderData* target_loader_data = resolved_method_class->class_loader_data();
670 assert(target_loader_data != nullptr, "resolved method's class has no class loader data");
671
672 stringStream ss;
673 ss.print("loader constraint violation: when resolving %s '", method_type);
674 Method::print_external_name(&ss, link_info.resolved_klass(), link_info.name(), link_info.signature());
675 ss.print("' the class loader %s of the current class, %s,"
676 " and the class loader %s for the method's defining class, %s, have"
677 " different Class objects for the type %s used in the signature (%s; %s)",
678 current_loader_data->loader_name_and_id(),
679 current_class->name()->as_C_string(),
680 target_loader_data->loader_name_and_id(),
681 resolved_method_class->name()->as_C_string(),
682 failed_type_symbol->as_C_string(),
683 current_class->class_in_module_of_loader(false, true),
684 resolved_method_class->class_in_module_of_loader(false, true));
685 THROW_MSG(vmSymbols::java_lang_LinkageError(), ss.as_string());
686 }
687 }
688
689 void LinkResolver::check_field_loader_constraints(Symbol* field, Symbol* sig,
690 Klass* current_klass,
691 Klass* sel_klass, TRAPS) {
692 Handle ref_loader(THREAD, current_klass->class_loader());
693 Handle sel_loader(THREAD, sel_klass->class_loader());
694
695 ResourceMark rm(THREAD); // needed for check_signature_loaders
696 Symbol* failed_type_symbol =
697 SystemDictionary::check_signature_loaders(sig,
698 /*klass_being_linked*/ nullptr, // We are not linking class
699 ref_loader, sel_loader,
700 false);
701 if (failed_type_symbol != nullptr) {
702 stringStream ss;
703 const char* failed_type_name = failed_type_symbol->as_klass_external_name();
704
705 ss.print("loader constraint violation: when resolving field \"%s\" of type %s, "
706 "the class loader %s of the current class, %s, "
707 "and the class loader %s for the field's defining %s, %s, "
708 "have different Class objects for type %s (%s; %s)",
709 field->as_C_string(),
710 failed_type_name,
711 current_klass->class_loader_data()->loader_name_and_id(),
712 current_klass->external_name(),
713 sel_klass->class_loader_data()->loader_name_and_id(),
714 sel_klass->external_kind(),
715 sel_klass->external_name(),
716 failed_type_name,
717 current_klass->class_in_module_of_loader(false, true),
718 sel_klass->class_in_module_of_loader(false, true));
719 THROW_MSG(vmSymbols::java_lang_LinkageError(), ss.as_string());
720 }
721 }
722
723 Method* LinkResolver::resolve_method(const LinkInfo& link_info,
724 Bytecodes::Code code, TRAPS) {
725
726 Handle nested_exception;
727 Klass* resolved_klass = link_info.resolved_klass();
728
729 // 1. For invokevirtual, cannot call an interface method
730 if (code == Bytecodes::_invokevirtual && resolved_klass->is_interface()) {
731 ResourceMark rm(THREAD);
732 char buf[200];
733 jio_snprintf(buf, sizeof(buf), "Found interface %s, but class was expected",
734 resolved_klass->external_name());
735 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
736 }
737
738 // 2. check constant pool tag for called method - must be JVM_CONSTANT_Methodref
739 if (!link_info.tag().is_invalid() && !link_info.tag().is_method()) {
740 ResourceMark rm(THREAD);
741 stringStream ss;
742 ss.print("Method '");
743 Method::print_external_name(&ss, link_info.resolved_klass(), link_info.name(), link_info.signature());
744 ss.print("' must be Methodref constant");
745 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
746 }
747
748 // 3. lookup method in resolved klass and its super klasses
749 methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, true, false));
750
751 // 4. lookup method in all the interfaces implemented by the resolved klass
752 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) { // not found in the class hierarchy
753 resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info));
754
755 if (resolved_method.is_null()) {
756 // JSR 292: see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc
757 Method* method = lookup_polymorphic_method(link_info, (Handle*)nullptr, THREAD);
758 resolved_method = methodHandle(THREAD, method);
759 if (HAS_PENDING_EXCEPTION) {
760 nested_exception = Handle(THREAD, PENDING_EXCEPTION);
761 CLEAR_PENDING_EXCEPTION;
762 }
763 }
764 }
765
766 // 5. method lookup failed
767 if (resolved_method.is_null()) {
768 ResourceMark rm(THREAD);
769 stringStream ss;
770 ss.print("'");
771 Method::print_external_name(&ss, resolved_klass, link_info.name(), link_info.signature());
772 ss.print("'");
773 THROW_MSG_CAUSE_(vmSymbols::java_lang_NoSuchMethodError(),
774 ss.as_string(), nested_exception, nullptr);
775 }
776
777 // 6. access checks, access checking may be turned off when calling from within the VM.
778 Klass* current_klass = link_info.current_klass();
779 if (link_info.check_access()) {
780 assert(current_klass != nullptr , "current_klass should not be null");
781
782 // check if method can be accessed by the referring class
783 check_method_accessability(current_klass,
784 resolved_klass,
785 resolved_method->method_holder(),
786 resolved_method,
787 CHECK_NULL);
788 }
789 if (link_info.check_loader_constraints()) {
790 // check loader constraints
791 check_method_loader_constraints(link_info, resolved_method, "method", CHECK_NULL);
792 }
793
794 return resolved_method();
795 }
796
797 static void trace_method_resolution(const char* prefix,
798 Klass* klass,
799 Klass* resolved_klass,
800 Method* method,
801 bool logitables,
802 int index = -1) {
803 #ifndef PRODUCT
804 ResourceMark rm;
805 Log(itables) logi;
806 LogStream lsi(logi.trace());
807 Log(vtables) logv;
808 LogStream lsv(logv.trace());
809 outputStream* st;
810 if (logitables) {
811 st = &lsi;
812 } else {
813 st = &lsv;
814 }
815 st->print("%s%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ",
816 prefix,
817 (klass == nullptr ? "<null>" : klass->internal_name()),
818 resolved_klass->internal_name(),
819 Method::name_and_sig_as_C_string(resolved_klass,
820 method->name(),
821 method->signature()),
822 method->method_holder()->internal_name());
823 method->print_linkage_flags(st);
824 if (index != -1) {
825 st->print("vtable_index:%d", index);
826 }
827 st->cr();
828 #endif // PRODUCT
829 }
830
831 // Do linktime resolution of a method in the interface within the context of the specified bytecode.
832 Method* LinkResolver::resolve_interface_method(const LinkInfo& link_info, Bytecodes::Code code, TRAPS) {
833
834 Klass* resolved_klass = link_info.resolved_klass();
835
836 // check if klass is interface
837 if (!resolved_klass->is_interface()) {
838 ResourceMark rm(THREAD);
839 char buf[200];
840 jio_snprintf(buf, sizeof(buf), "Found class %s, but interface was expected", resolved_klass->external_name());
841 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
842 }
843
844 // check constant pool tag for called method - must be JVM_CONSTANT_InterfaceMethodref
845 if (!link_info.tag().is_invalid() && !link_info.tag().is_interface_method()) {
846 ResourceMark rm(THREAD);
847 stringStream ss;
848 ss.print("Method '");
849 Method::print_external_name(&ss, link_info.resolved_klass(), link_info.name(), link_info.signature());
850 ss.print("' must be InterfaceMethodref constant");
851 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
852 }
853
854 // lookup method in this interface or its super, java.lang.Object
855 // JDK8: also look for static methods
856 methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, false, true));
857
858 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) {
859 // lookup method in all the super-interfaces
860 resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info));
861 }
862
863 if (resolved_method.is_null()) {
864 // no method found
865 ResourceMark rm(THREAD);
866 stringStream ss;
867 ss.print("'");
868 Method::print_external_name(&ss, resolved_klass, link_info.name(), link_info.signature());
869 ss.print("'");
870 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), ss.as_string());
871 }
872
873 if (link_info.check_access()) {
874 // JDK8 adds non-public interface methods, and accessability check requirement
875 Klass* current_klass = link_info.current_klass();
876
877 assert(current_klass != nullptr , "current_klass should not be null");
878
879 // check if method can be accessed by the referring class
880 check_method_accessability(current_klass,
881 resolved_klass,
882 resolved_method->method_holder(),
883 resolved_method,
884 CHECK_NULL);
885 }
886 if (link_info.check_loader_constraints()) {
887 check_method_loader_constraints(link_info, resolved_method, "interface method", CHECK_NULL);
888 }
889
890 if (code != Bytecodes::_invokestatic && resolved_method->is_static()) {
891 ResourceMark rm(THREAD);
892 stringStream ss;
893 ss.print("Expected instance not static method '");
894 Method::print_external_name(&ss, resolved_klass,
895 resolved_method->name(), resolved_method->signature());
896 ss.print("'");
897 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
898 }
899
900 if (log_develop_is_enabled(Trace, itables)) {
901 char buf[200];
902 jio_snprintf(buf, sizeof(buf), "%s resolved interface method: caller-class:",
903 Bytecodes::name(code));
904 trace_method_resolution(buf, link_info.current_klass(), resolved_klass, resolved_method(), true);
905 }
906
907 return resolved_method();
908 }
909
910 //------------------------------------------------------------------------------------------------------------------------
911 // Field resolution
912
913 void LinkResolver::check_field_accessability(Klass* ref_klass,
914 Klass* resolved_klass,
915 Klass* sel_klass,
916 const fieldDescriptor& fd,
917 TRAPS) {
918 bool can_access = Reflection::verify_member_access(ref_klass,
919 resolved_klass,
920 sel_klass,
921 fd.access_flags(),
922 true, false, CHECK);
923 // Any existing exceptions that may have been thrown, for example LinkageErrors
924 // from nest-host resolution, have been allowed to propagate.
925 if (!can_access) {
926 bool same_module = (sel_klass->module() == ref_klass->module());
927 ResourceMark rm(THREAD);
928 stringStream ss;
929 ss.print("class %s tried to access %s%sfield %s.%s (%s%s%s)",
930 ref_klass->external_name(),
931 fd.is_protected() ? "protected " : "",
932 fd.is_private() ? "private " : "",
933 sel_klass->external_name(),
934 fd.name()->as_C_string(),
935 (same_module) ? ref_klass->joint_in_module_of_loader(sel_klass) : ref_klass->class_in_module_of_loader(),
936 (same_module) ? "" : "; ",
937 (same_module) ? "" : sel_klass->class_in_module_of_loader()
938 );
939 // For private access see if there was a problem with nest host
940 // resolution, and if so report that as part of the message.
941 if (fd.is_private()) {
942 print_nest_host_error_on(&ss, ref_klass, sel_klass);
943 }
944 Exceptions::fthrow(THREAD_AND_LOCATION,
945 vmSymbols::java_lang_IllegalAccessError(),
946 "%s",
947 ss.as_string()
948 );
949 return;
950 }
951 }
952
953 void LinkResolver::resolve_field_access(fieldDescriptor& fd, const constantPoolHandle& pool, int index, const methodHandle& method, Bytecodes::Code byte, TRAPS) {
954 LinkInfo link_info(pool, index, method, byte, CHECK);
955 resolve_field(fd, link_info, byte, true, CHECK);
956 }
957
958 void LinkResolver::resolve_field(fieldDescriptor& fd,
959 const LinkInfo& link_info,
960 Bytecodes::Code byte, bool initialize_class,
961 TRAPS) {
962 assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic ||
963 byte == Bytecodes::_getfield || byte == Bytecodes::_putfield ||
964 byte == Bytecodes::_nofast_getfield || byte == Bytecodes::_nofast_putfield ||
965 (byte == Bytecodes::_nop && !link_info.check_access()), "bad field access bytecode");
966
967 bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic);
968 bool is_put = (byte == Bytecodes::_putfield || byte == Bytecodes::_putstatic ||
969 byte == Bytecodes::_nofast_putfield);
970 // Check if there's a resolved klass containing the field
971 Klass* resolved_klass = link_info.resolved_klass();
972 Symbol* field = link_info.name();
973 Symbol* sig = link_info.signature();
974
975 // Resolve instance field
976 Klass* sel_klass = resolved_klass->find_field(field, sig, &fd);
977 // check if field exists; i.e., if a klass containing the field def has been selected
978 if (sel_klass == nullptr) {
979 ResourceMark rm(THREAD);
980 stringStream ss;
981 ss.print("Class %s does not have member field '", resolved_klass->external_name());
982 sig->print_as_field_external_type(&ss);
983 ss.print(" %s'", field->as_C_string());
984 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), ss.as_string());
985 }
986
987 // Access checking may be turned off when calling from within the VM.
988 Klass* current_klass = link_info.current_klass();
989 if (link_info.check_access()) {
990
991 // check access
992 check_field_accessability(current_klass, resolved_klass, sel_klass, fd, CHECK);
993
994 // check for errors
995 if (is_static != fd.is_static()) {
996 ResourceMark rm(THREAD);
997 char msg[200];
998 jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string());
999 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg);
1000 }
1001
1002 // A final field can be modified only
1003 // (1) by methods declared in the class declaring the field and
1004 // (2) by the <clinit> method (in case of a static field)
1005 // or by the <init> method (in case of an instance field).
1006 if (is_put && fd.access_flags().is_final()) {
1007
1008 if (sel_klass != current_klass) {
1009 ResourceMark rm(THREAD);
1010 stringStream ss;
1011 ss.print("Update to %s final field %s.%s attempted from a different class (%s) than the field's declaring class",
1012 is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(),
1013 current_klass->external_name());
1014 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
1015 }
1016
1017 if (fd.constants()->pool_holder()->major_version() >= 53) {
1018 Method* m = link_info.current_method();
1019 assert(m != nullptr, "information about the current method must be available for 'put' bytecodes");
1020 bool is_initialized_static_final_update = (byte == Bytecodes::_putstatic &&
1021 fd.is_static() &&
1022 !m->is_class_initializer());
1023 bool is_initialized_instance_final_update = ((byte == Bytecodes::_putfield || byte == Bytecodes::_nofast_putfield) &&
1024 !fd.is_static() &&
1025 !m->is_object_constructor());
1026
1027 if (is_initialized_static_final_update || is_initialized_instance_final_update) {
1028 ResourceMark rm(THREAD);
1029 stringStream ss;
1030 ss.print("Update to %s final field %s.%s attempted from a different method (%s) than the initializer method %s ",
1031 is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(),
1032 m->name()->as_C_string(),
1033 is_static ? "<clinit>" : "<init>");
1034 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
1035 }
1036 }
1037 }
1038
1039 // initialize resolved_klass if necessary
1040 // note 1: the klass which declared the field must be initialized (i.e, sel_klass)
1041 // according to the newest JVM spec (5.5, p.170) - was bug (gri 7/28/99)
1042 //
1043 // note 2: we don't want to force initialization if we are just checking
1044 // if the field access is legal; e.g., during compilation
1045 if (is_static && initialize_class) {
1046 sel_klass->initialize(CHECK);
1047 }
1048 }
1049
1050 if (link_info.check_loader_constraints() && (sel_klass != current_klass) && (current_klass != nullptr)) {
1051 check_field_loader_constraints(field, sig, current_klass, sel_klass, CHECK);
1052 }
1053
1054 // return information. note that the klass is set to the actual klass containing the
1055 // field, otherwise access of static fields in superclasses will not work.
1056 }
1057
1058
1059 //------------------------------------------------------------------------------------------------------------------------
1060 // Invoke resolution
1061 //
1062 // Naming conventions:
1063 //
1064 // resolved_method the specified method (i.e., static receiver specified via constant pool index)
1065 // sel_method the selected method (selected via run-time lookup; e.g., based on dynamic receiver class)
1066 // resolved_klass the specified klass (i.e., specified via constant pool index)
1067 // recv_klass the receiver klass
1068
1069
1070 void LinkResolver::resolve_static_call(CallInfo& result,
1071 const LinkInfo& link_info,
1072 bool initialize_class, TRAPS) {
1073 Method* resolved_method = linktime_resolve_static_method(link_info, CHECK);
1074
1075 // The resolved class can change as a result of this resolution.
1076 Klass* resolved_klass = resolved_method->method_holder();
1077
1078 // Initialize klass (this should only happen if everything is ok)
1079 if (initialize_class && resolved_klass->should_be_initialized()) {
1080 resolved_klass->initialize(CHECK);
1081 // Use updated LinkInfo to reresolve with resolved method holder
1082 LinkInfo new_info(resolved_klass, link_info.name(), link_info.signature(),
1083 link_info.current_klass(),
1084 link_info.check_access() ? LinkInfo::AccessCheck::required : LinkInfo::AccessCheck::skip,
1085 link_info.check_loader_constraints() ? LinkInfo::LoaderConstraintCheck::required : LinkInfo::LoaderConstraintCheck::skip);
1086 resolved_method = linktime_resolve_static_method(new_info, CHECK);
1087 }
1088
1089 // setup result
1090 result.set_static(resolved_klass, methodHandle(THREAD, resolved_method), CHECK);
1091 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1092 }
1093
1094 // throws linktime exceptions
1095 Method* LinkResolver::linktime_resolve_static_method(const LinkInfo& link_info, TRAPS) {
1096
1097 Klass* resolved_klass = link_info.resolved_klass();
1098 Method* resolved_method;
1099 if (!resolved_klass->is_interface()) {
1100 resolved_method = resolve_method(link_info, Bytecodes::_invokestatic, CHECK_NULL);
1101 } else {
1102 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokestatic, CHECK_NULL);
1103 }
1104 assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier");
1105
1106 // check if static
1107 if (!resolved_method->is_static()) {
1108 ResourceMark rm(THREAD);
1109 stringStream ss;
1110 ss.print("Expected static method '");
1111 resolved_method->print_external_name(&ss);
1112 ss.print("'");
1113 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1114 }
1115 return resolved_method;
1116 }
1117
1118
1119 void LinkResolver::resolve_special_call(CallInfo& result,
1120 Handle recv,
1121 const LinkInfo& link_info,
1122 TRAPS) {
1123 Method* resolved_method = linktime_resolve_special_method(link_info, CHECK);
1124 runtime_resolve_special_method(result, link_info, methodHandle(THREAD, resolved_method), recv, CHECK);
1125 }
1126
1127 // throws linktime exceptions
1128 Method* LinkResolver::linktime_resolve_special_method(const LinkInfo& link_info, TRAPS) {
1129
1130 // Invokespecial is called for multiple special reasons:
1131 // <init>
1132 // local private method invocation, for classes and interfaces
1133 // superclass.method, which can also resolve to a default method
1134 // and the selected method is recalculated relative to the direct superclass
1135 // superinterface.method, which explicitly does not check shadowing
1136 Klass* resolved_klass = link_info.resolved_klass();
1137 Method* resolved_method = nullptr;
1138
1139 if (!resolved_klass->is_interface()) {
1140 resolved_method = resolve_method(link_info, Bytecodes::_invokespecial, CHECK_NULL);
1141 } else {
1142 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokespecial, CHECK_NULL);
1143 }
1144
1145 // check if method name is <init>, that it is found in same klass as static type
1146 // Since this method is never inherited from a super, any appearance here under
1147 // the wrong class would be an error.
1148 if (resolved_method->name() == vmSymbols::object_initializer_name() &&
1149 resolved_method->method_holder() != resolved_klass) {
1150 ResourceMark rm(THREAD);
1151 stringStream ss;
1152 ss.print("%s: method '", resolved_klass->external_name());
1153 resolved_method->signature()->print_as_signature_external_return_type(&ss);
1154 ss.print(" %s(", resolved_method->name()->as_C_string());
1155 resolved_method->signature()->print_as_signature_external_parameters(&ss);
1156 ss.print(")' not found");
1157 Exceptions::fthrow(
1158 THREAD_AND_LOCATION,
1159 vmSymbols::java_lang_NoSuchMethodError(),
1160 "%s", ss.as_string());
1161 return nullptr;
1162 }
1163
1164 // ensure that invokespecial's interface method reference is in
1165 // a direct superinterface, not an indirect superinterface
1166 Klass* current_klass = link_info.current_klass();
1167 if (current_klass != nullptr && resolved_klass->is_interface()) {
1168 InstanceKlass* klass_to_check = InstanceKlass::cast(current_klass);
1169 // Disable verification for the dynamically-generated reflection bytecodes
1170 // for serialization constructor accessor.
1171 bool is_reflect = klass_to_check->is_subclass_of(
1172 vmClasses::reflect_SerializationConstructorAccessorImpl_klass());
1173
1174 if (!is_reflect &&
1175 !klass_to_check->is_same_or_direct_interface(resolved_klass)) {
1176 ResourceMark rm(THREAD);
1177 stringStream ss;
1178 ss.print("Interface method reference: '");
1179 resolved_method->print_external_name(&ss);
1180 ss.print("', is in an indirect superinterface of %s",
1181 current_klass->external_name());
1182 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1183 }
1184 }
1185
1186 // check if not static
1187 if (resolved_method->is_static()) {
1188 ResourceMark rm(THREAD);
1189 stringStream ss;
1190 ss.print("Expecting non-static method '");
1191 resolved_method->print_external_name(&ss);
1192 ss.print("'");
1193 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1194 }
1195
1196 if (log_develop_is_enabled(Trace, itables)) {
1197 trace_method_resolution("invokespecial resolved method: caller-class:",
1198 current_klass, resolved_klass, resolved_method, true);
1199 }
1200
1201 return resolved_method;
1202 }
1203
1204 // throws runtime exceptions
1205 void LinkResolver::runtime_resolve_special_method(CallInfo& result,
1206 const LinkInfo& link_info,
1207 const methodHandle& resolved_method,
1208 Handle recv, TRAPS) {
1209
1210 Klass* resolved_klass = link_info.resolved_klass();
1211
1212 // resolved method is selected method unless we have an old-style lookup
1213 // for a superclass method
1214 // Invokespecial for a superinterface, resolved method is selected method,
1215 // no checks for shadowing
1216 methodHandle sel_method(THREAD, resolved_method());
1217
1218 if (link_info.check_access() &&
1219 // check if the method is not <init>, which is never inherited
1220 resolved_method->name() != vmSymbols::object_initializer_name()) {
1221
1222 Klass* current_klass = link_info.current_klass();
1223
1224 // Check if the class of the resolved_klass is a superclass
1225 // (not supertype in order to exclude interface classes) of the current class.
1226 // This check is not performed for super.invoke for interface methods
1227 // in super interfaces.
1228 if (current_klass->is_subclass_of(resolved_klass) &&
1229 current_klass != resolved_klass) {
1230 // Lookup super method
1231 Klass* super_klass = current_klass->super();
1232 Method* instance_method = lookup_instance_method_in_klasses(super_klass,
1233 resolved_method->name(),
1234 resolved_method->signature(),
1235 Klass::PrivateLookupMode::find);
1236 sel_method = methodHandle(THREAD, instance_method);
1237
1238 // check if found
1239 if (sel_method.is_null()) {
1240 ResourceMark rm(THREAD);
1241 stringStream ss;
1242 ss.print("'");
1243 resolved_method->print_external_name(&ss);
1244 ss.print("'");
1245 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1246 // check loader constraints if found a different method
1247 } else if (link_info.check_loader_constraints() && sel_method() != resolved_method()) {
1248 check_method_loader_constraints(link_info, sel_method, "method", CHECK);
1249 }
1250 }
1251
1252 // Check that the class of objectref (the receiver) is the current class or interface,
1253 // or a subtype of the current class or interface (the sender), otherwise invokespecial
1254 // throws IllegalAccessError.
1255 // The verifier checks that the sender is a subtype of the class in the I/MR operand.
1256 // The verifier also checks that the receiver is a subtype of the sender, if the sender is
1257 // a class. If the sender is an interface, the check has to be performed at runtime.
1258 InstanceKlass* sender = InstanceKlass::cast(current_klass);
1259 if (sender->is_interface() && recv.not_null()) {
1260 Klass* receiver_klass = recv->klass();
1261 if (!receiver_klass->is_subtype_of(sender)) {
1262 ResourceMark rm(THREAD);
1263 char buf[500];
1264 jio_snprintf(buf, sizeof(buf),
1265 "Receiver class %s must be the current class or a subtype of interface %s",
1266 receiver_klass->external_name(),
1267 sender->external_name());
1268 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), buf);
1269 }
1270 }
1271 }
1272
1273 // check if not static
1274 if (sel_method->is_static()) {
1275 ResourceMark rm(THREAD);
1276 stringStream ss;
1277 ss.print("Expecting non-static method '");
1278 resolved_method->print_external_name(&ss);
1279 ss.print("'");
1280 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1281 }
1282
1283 // check if abstract
1284 if (sel_method->is_abstract()) {
1285 ResourceMark rm(THREAD);
1286 stringStream ss;
1287 ss.print("'");
1288 Method::print_external_name(&ss, resolved_klass, sel_method->name(), sel_method->signature());
1289 ss.print("'");
1290 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1291 }
1292
1293 if (log_develop_is_enabled(Trace, itables)) {
1294 trace_method_resolution("invokespecial selected method: resolved-class:",
1295 resolved_klass, resolved_klass, sel_method(), true);
1296 }
1297
1298 // setup result
1299 result.set_static(resolved_klass, sel_method, CHECK);
1300 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1301 }
1302
1303 void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, Klass* receiver_klass,
1304 const LinkInfo& link_info,
1305 bool check_null_and_abstract, TRAPS) {
1306 Method* resolved_method = linktime_resolve_virtual_method(link_info, CHECK);
1307 runtime_resolve_virtual_method(result, methodHandle(THREAD, resolved_method),
1308 link_info.resolved_klass(),
1309 recv, receiver_klass,
1310 check_null_and_abstract, CHECK);
1311 }
1312
1313 // throws linktime exceptions
1314 Method* LinkResolver::linktime_resolve_virtual_method(const LinkInfo& link_info,
1315 TRAPS) {
1316 // normal method resolution
1317 Method* resolved_method = resolve_method(link_info, Bytecodes::_invokevirtual, CHECK_NULL);
1318
1319 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1320 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1321
1322 // check if private interface method
1323 Klass* resolved_klass = link_info.resolved_klass();
1324 Klass* current_klass = link_info.current_klass();
1325
1326 // This is impossible, if resolve_klass is an interface, we've thrown icce in resolve_method
1327 if (resolved_klass->is_interface() && resolved_method->is_private()) {
1328 ResourceMark rm(THREAD);
1329 stringStream ss;
1330 ss.print("private interface method requires invokespecial, not invokevirtual: method '");
1331 resolved_method->print_external_name(&ss);
1332 ss.print("', caller-class: %s",
1333 (current_klass == nullptr ? "<null>" : current_klass->internal_name()));
1334 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1335 }
1336
1337 // check if not static
1338 if (resolved_method->is_static()) {
1339 ResourceMark rm(THREAD);
1340 stringStream ss;
1341 ss.print("Expecting non-static method '");
1342 resolved_method->print_external_name(&ss);
1343 ss.print("'");
1344 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1345 }
1346
1347 if (log_develop_is_enabled(Trace, vtables)) {
1348 trace_method_resolution("invokevirtual resolved method: caller-class:",
1349 current_klass, resolved_klass, resolved_method, false);
1350 }
1351
1352 return resolved_method;
1353 }
1354
1355 // throws runtime exceptions
1356 void LinkResolver::runtime_resolve_virtual_method(CallInfo& result,
1357 const methodHandle& resolved_method,
1358 Klass* resolved_klass,
1359 Handle recv,
1360 Klass* recv_klass,
1361 bool check_null_and_abstract,
1362 TRAPS) {
1363
1364 // setup default return values
1365 int vtable_index = Method::invalid_vtable_index;
1366 methodHandle selected_method;
1367
1368 // runtime method resolution
1369 if (check_null_and_abstract && recv.is_null()) { // check if receiver exists
1370 THROW(vmSymbols::java_lang_NullPointerException());
1371 }
1372
1373 // Virtual methods cannot be resolved before its klass has been linked, for otherwise the Method*'s
1374 // has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since
1375 // a missing receiver might result in a bogus lookup.
1376 assert(resolved_method->method_holder()->is_linked(), "must be linked");
1377
1378 // do lookup based on receiver klass using the vtable index
1379 if (resolved_method->method_holder()->is_interface()) { // default or miranda method
1380 vtable_index = vtable_index_of_interface_method(resolved_klass, resolved_method);
1381 assert(vtable_index >= 0 , "we should have valid vtable index at this point");
1382
1383 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1384 } else {
1385 // at this point we are sure that resolved_method is virtual and not
1386 // a default or miranda method; therefore, it must have a valid vtable index.
1387 assert(!resolved_method->has_itable_index(), "");
1388 vtable_index = resolved_method->vtable_index();
1389 // We could get a negative vtable_index of nonvirtual_vtable_index for private
1390 // methods, or for final methods. Private methods never appear in the vtable
1391 // and never override other methods. As an optimization, final methods are
1392 // never put in the vtable, unless they override an existing method.
1393 // So if we do get nonvirtual_vtable_index, it means the selected method is the
1394 // resolved method, and it can never be changed by an override.
1395 if (vtable_index == Method::nonvirtual_vtable_index) {
1396 assert(resolved_method->can_be_statically_bound(), "cannot override this method");
1397 selected_method = resolved_method;
1398 } else {
1399 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1400 }
1401 }
1402
1403 // check if method exists
1404 if (selected_method.is_null()) {
1405 throw_abstract_method_error(resolved_method, recv_klass, CHECK);
1406 }
1407
1408 // check if abstract
1409 if (check_null_and_abstract && selected_method->is_abstract()) {
1410 // Pass arguments for generating a verbose error message.
1411 throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK);
1412 }
1413
1414 if (log_develop_is_enabled(Trace, vtables)) {
1415 trace_method_resolution("invokevirtual selected method: receiver-class:",
1416 recv_klass, resolved_klass, selected_method(),
1417 false, vtable_index);
1418 }
1419 // setup result
1420 result.set_virtual(resolved_klass, resolved_method, selected_method, vtable_index, CHECK);
1421 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1422 }
1423
1424 void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, Klass* recv_klass,
1425 const LinkInfo& link_info,
1426 bool check_null_and_abstract, TRAPS) {
1427 // throws linktime exceptions
1428 Method* resolved_method = linktime_resolve_interface_method(link_info, CHECK);
1429 methodHandle mh(THREAD, resolved_method);
1430 runtime_resolve_interface_method(result, mh, link_info.resolved_klass(),
1431 recv, recv_klass, check_null_and_abstract, CHECK);
1432 }
1433
1434 Method* LinkResolver::linktime_resolve_interface_method(const LinkInfo& link_info,
1435 TRAPS) {
1436 // normal interface method resolution
1437 Method* resolved_method = resolve_interface_method(link_info, Bytecodes::_invokeinterface, CHECK_NULL);
1438 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1439 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1440
1441 return resolved_method;
1442 }
1443
1444 // throws runtime exceptions
1445 void LinkResolver::runtime_resolve_interface_method(CallInfo& result,
1446 const methodHandle& resolved_method,
1447 Klass* resolved_klass,
1448 Handle recv,
1449 Klass* recv_klass,
1450 bool check_null_and_abstract, TRAPS) {
1451
1452 // check if receiver exists
1453 if (check_null_and_abstract && recv.is_null()) {
1454 THROW(vmSymbols::java_lang_NullPointerException());
1455 }
1456
1457 // check if receiver klass implements the resolved interface
1458 if (!recv_klass->is_subtype_of(resolved_klass)) {
1459 ResourceMark rm(THREAD);
1460 char buf[200];
1461 jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s",
1462 recv_klass->external_name(),
1463 resolved_klass->external_name());
1464 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1465 }
1466
1467 methodHandle selected_method = resolved_method;
1468
1469 // resolve the method in the receiver class, unless it is private
1470 if (!resolved_method()->is_private()) {
1471 // do lookup based on receiver klass
1472 // This search must match the linktime preparation search for itable initialization
1473 // to correctly enforce loader constraints for interface method inheritance.
1474 // Private methods are skipped as the resolved method was not private.
1475 Method* method = lookup_instance_method_in_klasses(recv_klass,
1476 resolved_method->name(),
1477 resolved_method->signature(),
1478 Klass::PrivateLookupMode::skip);
1479 selected_method = methodHandle(THREAD, method);
1480
1481 if (selected_method.is_null() && !check_null_and_abstract) {
1482 // In theory this is a harmless placeholder value, but
1483 // in practice leaving in null affects the nsk default method tests.
1484 // This needs further study.
1485 selected_method = resolved_method;
1486 }
1487 // check if method exists
1488 if (selected_method.is_null()) {
1489 // Pass arguments for generating a verbose error message.
1490 throw_abstract_method_error(resolved_method, recv_klass, CHECK);
1491 }
1492 // check access
1493 // Throw Illegal Access Error if selected_method is not public.
1494 if (!selected_method->is_public()) {
1495 ResourceMark rm(THREAD);
1496 stringStream ss;
1497 ss.print("'");
1498 Method::print_external_name(&ss, recv_klass, selected_method->name(), selected_method->signature());
1499 ss.print("'");
1500 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
1501 }
1502 // check if abstract
1503 if (check_null_and_abstract && selected_method->is_abstract()) {
1504 throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK);
1505 }
1506 }
1507
1508 if (log_develop_is_enabled(Trace, itables)) {
1509 trace_method_resolution("invokeinterface selected method: receiver-class:",
1510 recv_klass, resolved_klass, selected_method(), true);
1511 }
1512 // setup result
1513 if (resolved_method->has_vtable_index()) {
1514 int vtable_index = resolved_method->vtable_index();
1515 log_develop_trace(itables)(" -- vtable index: %d", vtable_index);
1516 assert(vtable_index == selected_method->vtable_index(), "sanity check");
1517 result.set_virtual(resolved_klass, resolved_method, selected_method, vtable_index, CHECK);
1518 } else if (resolved_method->has_itable_index()) {
1519 int itable_index = resolved_method()->itable_index();
1520 log_develop_trace(itables)(" -- itable index: %d", itable_index);
1521 result.set_interface(resolved_klass, resolved_method, selected_method, itable_index, CHECK);
1522 } else {
1523 int index = resolved_method->vtable_index();
1524 log_develop_trace(itables)(" -- non itable/vtable index: %d", index);
1525 assert(index == Method::nonvirtual_vtable_index, "Oops hit another case!");
1526 assert(resolved_method()->is_private() ||
1527 (resolved_method()->is_final() && resolved_method->method_holder() == vmClasses::Object_klass()),
1528 "Should only have non-virtual invokeinterface for private or final-Object methods!");
1529 assert(resolved_method()->can_be_statically_bound(), "Should only have non-virtual invokeinterface for statically bound methods!");
1530 // This sets up the nonvirtual form of "virtual" call (as needed for final and private methods)
1531 result.set_virtual(resolved_klass, resolved_method, resolved_method, index, CHECK);
1532 }
1533 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1534 }
1535
1536
1537 Method* LinkResolver::linktime_resolve_interface_method_or_null(
1538 const LinkInfo& link_info) {
1539 EXCEPTION_MARK;
1540 Method* method_result = linktime_resolve_interface_method(link_info, THREAD);
1541 if (HAS_PENDING_EXCEPTION) {
1542 CLEAR_PENDING_EXCEPTION;
1543 return nullptr;
1544 } else {
1545 return method_result;
1546 }
1547 }
1548
1549 Method* LinkResolver::linktime_resolve_virtual_method_or_null(
1550 const LinkInfo& link_info) {
1551 EXCEPTION_MARK;
1552 Method* method_result = linktime_resolve_virtual_method(link_info, THREAD);
1553 if (HAS_PENDING_EXCEPTION) {
1554 CLEAR_PENDING_EXCEPTION;
1555 return nullptr;
1556 } else {
1557 return method_result;
1558 }
1559 }
1560
1561 Method* LinkResolver::resolve_virtual_call_or_null(
1562 Klass* receiver_klass,
1563 const LinkInfo& link_info) {
1564 EXCEPTION_MARK;
1565 CallInfo info;
1566 resolve_virtual_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1567 if (HAS_PENDING_EXCEPTION) {
1568 CLEAR_PENDING_EXCEPTION;
1569 return nullptr;
1570 }
1571 return info.selected_method();
1572 }
1573
1574 Method* LinkResolver::resolve_interface_call_or_null(
1575 Klass* receiver_klass,
1576 const LinkInfo& link_info) {
1577 EXCEPTION_MARK;
1578 CallInfo info;
1579 resolve_interface_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1580 if (HAS_PENDING_EXCEPTION) {
1581 CLEAR_PENDING_EXCEPTION;
1582 return nullptr;
1583 }
1584 return info.selected_method();
1585 }
1586
1587 int LinkResolver::resolve_virtual_vtable_index(Klass* receiver_klass,
1588 const LinkInfo& link_info) {
1589 EXCEPTION_MARK;
1590 CallInfo info;
1591 resolve_virtual_call(info, Handle(), receiver_klass, link_info,
1592 /*check_null_or_abstract*/false, THREAD);
1593 if (HAS_PENDING_EXCEPTION) {
1594 CLEAR_PENDING_EXCEPTION;
1595 return Method::invalid_vtable_index;
1596 }
1597 return info.vtable_index();
1598 }
1599
1600 Method* LinkResolver::resolve_static_call_or_null(const LinkInfo& link_info) {
1601 EXCEPTION_MARK;
1602 CallInfo info;
1603 resolve_static_call(info, link_info, /*initialize_class*/false, THREAD);
1604 if (HAS_PENDING_EXCEPTION) {
1605 CLEAR_PENDING_EXCEPTION;
1606 return nullptr;
1607 }
1608 return info.selected_method();
1609 }
1610
1611 Method* LinkResolver::resolve_special_call_or_null(const LinkInfo& link_info) {
1612 EXCEPTION_MARK;
1613 CallInfo info;
1614 resolve_special_call(info, Handle(), link_info, THREAD);
1615 if (HAS_PENDING_EXCEPTION) {
1616 CLEAR_PENDING_EXCEPTION;
1617 return nullptr;
1618 }
1619 return info.selected_method();
1620 }
1621
1622
1623
1624 //------------------------------------------------------------------------------------------------------------------------
1625 // ConstantPool entries
1626
1627 void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) {
1628 switch (byte) {
1629 case Bytecodes::_invokestatic : resolve_invokestatic (result, pool, index, CHECK); break;
1630 case Bytecodes::_invokespecial : resolve_invokespecial (result, recv, pool, index, CHECK); break;
1631 case Bytecodes::_invokevirtual : resolve_invokevirtual (result, recv, pool, index, CHECK); break;
1632 case Bytecodes::_invokehandle : resolve_invokehandle (result, pool, index, CHECK); break;
1633 case Bytecodes::_invokedynamic : resolve_invokedynamic (result, pool, index, CHECK); break;
1634 case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break;
1635 default : break;
1636 }
1637 return;
1638 }
1639
1640 void LinkResolver::resolve_invoke(CallInfo& result, Handle& recv,
1641 const methodHandle& attached_method,
1642 Bytecodes::Code byte, bool check_null_and_abstract, TRAPS) {
1643 Klass* defc = attached_method->method_holder();
1644 Symbol* name = attached_method->name();
1645 Symbol* type = attached_method->signature();
1646 LinkInfo link_info(defc, name, type);
1647 Klass* recv_klass = recv.is_null() ? defc : recv->klass();
1648 switch(byte) {
1649 case Bytecodes::_invokevirtual:
1650 resolve_virtual_call(result, recv, recv_klass, link_info,
1651 check_null_and_abstract, CHECK);
1652 break;
1653 case Bytecodes::_invokeinterface:
1654 resolve_interface_call(result, recv, recv_klass, link_info,
1655 check_null_and_abstract, CHECK);
1656 break;
1657 case Bytecodes::_invokestatic:
1658 resolve_static_call(result, link_info, /*initialize_class=*/false, CHECK);
1659 break;
1660 case Bytecodes::_invokespecial:
1661 resolve_special_call(result, recv, link_info, CHECK);
1662 break;
1663 default:
1664 fatal("bad call: %s", Bytecodes::name(byte));
1665 break;
1666 }
1667 }
1668
1669 void LinkResolver::resolve_invokestatic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1670 LinkInfo link_info(pool, index, Bytecodes::_invokestatic, CHECK);
1671 resolve_static_call(result, link_info, /*initialize_class*/true, CHECK);
1672 }
1673
1674
1675 void LinkResolver::resolve_invokespecial(CallInfo& result, Handle recv,
1676 const constantPoolHandle& pool, int index, TRAPS) {
1677 LinkInfo link_info(pool, index, Bytecodes::_invokespecial, CHECK);
1678 resolve_special_call(result, recv, link_info, CHECK);
1679 }
1680
1681
1682 void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv,
1683 const constantPoolHandle& pool, int index,
1684 TRAPS) {
1685
1686 LinkInfo link_info(pool, index, Bytecodes::_invokevirtual, CHECK);
1687 Klass* recvrKlass = recv.is_null() ? (Klass*)nullptr : recv->klass();
1688 resolve_virtual_call(result, recv, recvrKlass, link_info, /*check_null_or_abstract*/true, CHECK);
1689 }
1690
1691
1692 void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, TRAPS) {
1693 LinkInfo link_info(pool, index, Bytecodes::_invokeinterface, CHECK);
1694 Klass* recvrKlass = recv.is_null() ? (Klass*)nullptr : recv->klass();
1695 resolve_interface_call(result, recv, recvrKlass, link_info, true, CHECK);
1696 }
1697
1698 bool LinkResolver::resolve_previously_linked_invokehandle(CallInfo& result, const LinkInfo& link_info, const constantPoolHandle& pool, int index, TRAPS) {
1699 ResolvedMethodEntry* method_entry = pool->cache()->resolved_method_entry_at(index);
1700 if (method_entry->method() != nullptr) {
1701 Klass* resolved_klass = link_info.resolved_klass();
1702 methodHandle method(THREAD, method_entry->method());
1703 Handle appendix(THREAD, pool->cache()->appendix_if_resolved(method_entry));
1704 result.set_handle(resolved_klass, method, appendix, CHECK_false);
1705 JFR_ONLY(Jfr::on_resolution(result, CHECK_false);)
1706 return true;
1707 } else {
1708 return false;
1709 }
1710 }
1711
1712 void LinkResolver::resolve_invokehandle(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1713 LinkInfo link_info(pool, index, Bytecodes::_invokehandle, CHECK);
1714 if (log_is_enabled(Info, methodhandles)) {
1715 ResourceMark rm(THREAD);
1716 log_info(methodhandles)("resolve_invokehandle %s %s", link_info.name()->as_C_string(),
1717 link_info.signature()->as_C_string());
1718 }
1719 { // Check if the call site has been bound already, and short circuit:
1720 bool is_done = resolve_previously_linked_invokehandle(result, link_info, pool, index, CHECK);
1721 if (is_done) return;
1722 }
1723 resolve_handle_call(result, link_info, CHECK);
1724 }
1725
1726 void LinkResolver::resolve_handle_call(CallInfo& result,
1727 const LinkInfo& link_info,
1728 TRAPS) {
1729 // JSR 292: this must be an implicitly generated method MethodHandle.invokeExact(*...) or similar
1730 Klass* resolved_klass = link_info.resolved_klass();
1731 assert(resolved_klass == vmClasses::MethodHandle_klass() ||
1732 resolved_klass == vmClasses::VarHandle_klass(), "");
1733 assert(MethodHandles::is_signature_polymorphic_name(link_info.name()), "");
1734 Handle resolved_appendix;
1735 Method* m = lookup_polymorphic_method(link_info, &resolved_appendix, CHECK);
1736 methodHandle resolved_method(THREAD, m);
1737
1738 if (link_info.check_access()) {
1739 Symbol* name = link_info.name();
1740 vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name);
1741 if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) {
1742 // Check if method can be accessed by the referring class.
1743 // MH.linkTo* invocations are not rewritten to invokehandle.
1744 assert(iid == vmIntrinsicID::_invokeBasic, "%s", vmIntrinsics::name_at(iid));
1745
1746 Klass* current_klass = link_info.current_klass();
1747 assert(current_klass != nullptr , "current_klass should not be null");
1748 check_method_accessability(current_klass,
1749 resolved_klass,
1750 resolved_method->method_holder(),
1751 resolved_method,
1752 CHECK);
1753 } else {
1754 // Java code is free to arbitrarily link signature-polymorphic invokers.
1755 assert(iid == vmIntrinsics::_invokeGeneric, "not an invoker: %s", vmIntrinsics::name_at(iid));
1756 assert(MethodHandles::is_signature_polymorphic_public_name(resolved_klass, name), "not public");
1757 }
1758 }
1759 result.set_handle(resolved_klass, resolved_method, resolved_appendix, CHECK);
1760 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1761 }
1762
1763 void LinkResolver::resolve_invokedynamic(CallInfo& result, const constantPoolHandle& pool, int indy_index, TRAPS) {
1764 int index = pool->decode_invokedynamic_index(indy_index);
1765 int pool_index = pool->resolved_indy_entry_at(index)->constant_pool_index();
1766
1767 // Resolve the bootstrap specifier (BSM + optional arguments).
1768 BootstrapInfo bootstrap_specifier(pool, pool_index, index);
1769
1770 // Check if CallSite has been bound already or failed already, and short circuit:
1771 {
1772 bool is_done = bootstrap_specifier.resolve_previously_linked_invokedynamic(result, CHECK);
1773 if (is_done) return;
1774 }
1775
1776 // The initial step in Call Site Specifier Resolution is to resolve the symbolic
1777 // reference to a method handle which will be the bootstrap method for a dynamic
1778 // call site. If resolution for the java.lang.invoke.MethodHandle for the bootstrap
1779 // method fails, then a MethodHandleInError is stored at the corresponding bootstrap
1780 // method's CP index for the CONSTANT_MethodHandle_info.
1781 // Any subsequent invokedynamic instruction which shares
1782 // this bootstrap method will encounter the resolution of MethodHandleInError.
1783
1784 resolve_dynamic_call(result, bootstrap_specifier, CHECK);
1785
1786 LogTarget(Debug, methodhandles, indy) lt_indy;
1787 if (lt_indy.is_enabled()) {
1788 LogStream ls(lt_indy);
1789 bootstrap_specifier.print_msg_on(&ls, "resolve_invokedynamic");
1790 }
1791
1792 // The returned linkage result is provisional up to the moment
1793 // the interpreter or runtime performs a serialized check of
1794 // the relevant ResolvedIndyEntry::method field. This is done by the caller
1795 // of this method, via CPC::set_dynamic_call, which uses
1796 // a lock to do the final serialization of updates
1797 // to ResolvedIndyEntry state, including method.
1798
1799 // Log dynamic info to CDS classlist.
1800 ArchiveUtils::log_to_classlist(&bootstrap_specifier, CHECK);
1801 }
1802
1803 void LinkResolver::resolve_dynamic_call(CallInfo& result,
1804 BootstrapInfo& bootstrap_specifier,
1805 TRAPS) {
1806 // JSR 292: this must resolve to an implicitly generated method
1807 // such as MH.linkToCallSite(*...) or some other call-site shape.
1808 // The appendix argument is likely to be a freshly-created CallSite.
1809 // It may also be a MethodHandle from an unwrapped ConstantCallSite,
1810 // or any other reference. The resolved_method as well as the appendix
1811 // are both recorded together via CallInfo::set_handle.
1812 SystemDictionary::invoke_bootstrap_method(bootstrap_specifier, THREAD);
1813 Exceptions::wrap_dynamic_exception(/* is_indy */ true, THREAD);
1814
1815 if (HAS_PENDING_EXCEPTION) {
1816 if (!PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass())) {
1817 // Let any random low-level IE or SOE or OOME just bleed through.
1818 // Basically we pretend that the bootstrap method was never called,
1819 // if it fails this way: We neither record a successful linkage,
1820 // nor do we memorize a LE for posterity.
1821 return;
1822 }
1823 // JVMS 5.4.3 says: If an attempt by the Java Virtual Machine to resolve
1824 // a symbolic reference fails because an error is thrown that is an
1825 // instance of LinkageError (or a subclass), then subsequent attempts to
1826 // resolve the reference always fail with the same error that was thrown
1827 // as a result of the initial resolution attempt.
1828 bool recorded_res_status = bootstrap_specifier.save_and_throw_indy_exc(CHECK);
1829 if (!recorded_res_status) {
1830 // Another thread got here just before we did. So, either use the method
1831 // that it resolved or throw the LinkageError exception that it threw.
1832 bool is_done = bootstrap_specifier.resolve_previously_linked_invokedynamic(result, CHECK);
1833 if (is_done) return;
1834 }
1835 assert(bootstrap_specifier.pool()->resolved_indy_entry_at(bootstrap_specifier.indy_index())->resolution_failed(),
1836 "Resolution should have failed");
1837 }
1838
1839 bootstrap_specifier.resolve_newly_linked_invokedynamic(result, CHECK);
1840 // Exceptions::wrap_dynamic_exception not used because
1841 // set_handle doesn't throw linkage errors
1842 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1843 }
1844
1845 // Selected method is abstract.
1846 void LinkResolver::throw_abstract_method_error(const methodHandle& resolved_method,
1847 const methodHandle& selected_method,
1848 Klass *recv_klass, TRAPS) {
1849 Klass *resolved_klass = resolved_method->method_holder();
1850 ResourceMark rm(THREAD);
1851 stringStream ss;
1852
1853 if (recv_klass != nullptr) {
1854 ss.print("Receiver class %s does not define or inherit an "
1855 "implementation of the",
1856 recv_klass->external_name());
1857 } else {
1858 ss.print("Missing implementation of");
1859 }
1860
1861 assert(resolved_method.not_null(), "Sanity");
1862 ss.print(" resolved method '%s%s",
1863 resolved_method->is_abstract() ? "abstract " : "",
1864 resolved_method->is_private() ? "private " : "");
1865 resolved_method->signature()->print_as_signature_external_return_type(&ss);
1866 ss.print(" %s(", resolved_method->name()->as_C_string());
1867 resolved_method->signature()->print_as_signature_external_parameters(&ss);
1868 ss.print(")' of %s %s.",
1869 resolved_klass->external_kind(),
1870 resolved_klass->external_name());
1871
1872 if (selected_method.not_null() && !(resolved_method == selected_method)) {
1873 ss.print(" Selected method is '%s%s",
1874 selected_method->is_abstract() ? "abstract " : "",
1875 selected_method->is_private() ? "private " : "");
1876 selected_method->print_external_name(&ss);
1877 ss.print("'.");
1878 }
1879
1880 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1881 }
--- EOF ---