1 /*
2 * Copyright (c) 1997, 2024, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "cds/archiveUtils.hpp"
27 #include "classfile/defaultMethods.hpp"
28 #include "classfile/javaClasses.hpp"
29 #include "classfile/systemDictionary.hpp"
30 #include "classfile/vmClasses.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "compiler/compilationPolicy.hpp"
33 #include "compiler/compileBroker.hpp"
34 #include "gc/shared/collectedHeap.inline.hpp"
35 #include "interpreter/bootstrapInfo.hpp"
36 #include "interpreter/bytecode.hpp"
37 #include "interpreter/interpreterRuntime.hpp"
38 #include "interpreter/linkResolver.hpp"
39 #include "jvm.h"
40 #include "logging/log.hpp"
41 #include "logging/logStream.hpp"
42 #include "memory/resourceArea.hpp"
43 #include "oops/constantPool.inline.hpp"
44 #include "oops/cpCache.inline.hpp"
45 #include "oops/instanceKlass.inline.hpp"
46 #include "oops/klass.inline.hpp"
47 #include "oops/method.inline.hpp"
48 #include "oops/objArrayKlass.hpp"
49 #include "oops/objArrayOop.hpp"
50 #include "oops/oop.inline.hpp"
51 #include "oops/resolvedIndyEntry.hpp"
52 #include "oops/symbolHandle.hpp"
53 #include "prims/jvmtiExport.hpp"
54 #include "prims/methodHandles.hpp"
55 #include "runtime/fieldDescriptor.inline.hpp"
56 #include "runtime/frame.inline.hpp"
57 #include "runtime/handles.inline.hpp"
58 #include "runtime/javaThread.hpp"
59 #include "runtime/reflection.hpp"
60 #include "runtime/safepointVerifiers.hpp"
61 #include "runtime/sharedRuntime.hpp"
62 #include "runtime/signature.hpp"
63 #include "runtime/vmThread.hpp"
64 #include "utilities/macros.hpp"
65 #if INCLUDE_JFR
66 #include "jfr/jfr.hpp"
67 #endif
68
69 //------------------------------------------------------------------------------------------------------------------------
70 // Implementation of CallInfo
71
72
73 void CallInfo::set_static(Klass* resolved_klass, const methodHandle& resolved_method, TRAPS) {
74 int vtable_index = Method::nonvirtual_vtable_index;
75 set_common(resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK);
76 }
77
78
79 void CallInfo::set_interface(Klass* resolved_klass,
80 const methodHandle& resolved_method,
81 const methodHandle& selected_method,
82 int itable_index, TRAPS) {
83 // This is only called for interface methods. If the resolved_method
84 // comes from java/lang/Object, it can be the subject of a virtual call, so
85 // we should pick the vtable index from the resolved method.
86 // In that case, the caller must call set_virtual instead of set_interface.
87 assert(resolved_method->method_holder()->is_interface(), "");
88 assert(itable_index == resolved_method()->itable_index(), "");
89 set_common(resolved_klass, resolved_method, selected_method, CallInfo::itable_call, itable_index, CHECK);
90 }
91
92 void CallInfo::set_virtual(Klass* resolved_klass,
93 const methodHandle& resolved_method,
94 const methodHandle& selected_method,
95 int vtable_index, TRAPS) {
96 assert(vtable_index >= 0 || vtable_index == Method::nonvirtual_vtable_index, "valid index");
97 assert(vtable_index < 0 || !resolved_method->has_vtable_index() || vtable_index == resolved_method->vtable_index(), "");
98 CallKind kind = (vtable_index >= 0 && !resolved_method->can_be_statically_bound() ? CallInfo::vtable_call : CallInfo::direct_call);
99 set_common(resolved_klass, resolved_method, selected_method, kind, vtable_index, CHECK);
100 assert(!resolved_method->is_compiled_lambda_form(), "these must be handled via an invokehandle call");
101 }
102
103 void CallInfo::set_handle(Klass* resolved_klass,
104 const methodHandle& resolved_method,
105 Handle resolved_appendix, TRAPS) {
106 guarantee(resolved_method.not_null(), "resolved method is null");
107 assert(resolved_method->intrinsic_id() == vmIntrinsics::_invokeBasic ||
108 resolved_method->is_compiled_lambda_form(),
109 "linkMethod must return one of these");
110 int vtable_index = Method::nonvirtual_vtable_index;
111 assert(!resolved_method->has_vtable_index(), "");
112 set_common(resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK);
113 _resolved_appendix = resolved_appendix;
114 }
115
116 // Redefinition safepoint may have updated the method. Make sure the new version of the method is returned.
117 // Callers are responsible for not safepointing and storing this method somewhere safe where redefinition
118 // can replace it if runs again. Safe places are constant pool cache and code cache metadata.
119 // The old method is safe in CallInfo since its a methodHandle (it won't get deleted), and accessed with these
120 // accessors.
121 Method* CallInfo::resolved_method() const {
122 if (JvmtiExport::can_hotswap_or_post_breakpoint() && _resolved_method->is_old()) {
123 return _resolved_method->get_new_method();
124 } else {
125 return _resolved_method();
126 }
127 }
128
129 Method* CallInfo::selected_method() const {
130 if (JvmtiExport::can_hotswap_or_post_breakpoint() && _selected_method->is_old()) {
131 return _selected_method->get_new_method();
132 } else {
133 return _selected_method();
134 }
135 }
136
137 void CallInfo::set_common(Klass* resolved_klass,
138 const methodHandle& resolved_method,
139 const methodHandle& selected_method,
140 CallKind kind,
141 int index,
142 TRAPS) {
143 assert(resolved_method->signature() == selected_method->signature(), "signatures must correspond");
144 _resolved_klass = resolved_klass;
145 _resolved_method = resolved_method;
146 _selected_method = selected_method;
147 _call_kind = kind;
148 _call_index = index;
149 _resolved_appendix = Handle();
150 DEBUG_ONLY(verify()); // verify before making side effects
151
152 CompilationPolicy::compile_if_required(selected_method, THREAD);
153 }
154
155 // utility query for unreflecting a method
156 CallInfo::CallInfo(Method* resolved_method, Klass* resolved_klass, TRAPS) {
157 Klass* resolved_method_holder = resolved_method->method_holder();
158 if (resolved_klass == nullptr) { // 2nd argument defaults to holder of 1st
159 resolved_klass = resolved_method_holder;
160 }
161 _resolved_klass = resolved_klass;
162 _resolved_method = methodHandle(THREAD, resolved_method);
163 _selected_method = methodHandle(THREAD, resolved_method);
164 // classify:
165 CallKind kind = CallInfo::unknown_kind;
166 int index = resolved_method->vtable_index();
167 if (resolved_method->can_be_statically_bound()) {
168 kind = CallInfo::direct_call;
169 } else if (!resolved_method_holder->is_interface()) {
170 // Could be an Object method inherited into an interface, but still a vtable call.
171 kind = CallInfo::vtable_call;
172 } else if (!resolved_klass->is_interface()) {
173 // A default or miranda method. Compute the vtable index.
174 index = LinkResolver::vtable_index_of_interface_method(resolved_klass, _resolved_method);
175 assert(index >= 0 , "we should have valid vtable index at this point");
176
177 kind = CallInfo::vtable_call;
178 } else if (resolved_method->has_vtable_index()) {
179 // Can occur if an interface redeclares a method of Object.
180
181 #ifdef ASSERT
182 // Ensure that this is really the case.
183 Klass* object_klass = vmClasses::Object_klass();
184 Method * object_resolved_method = object_klass->vtable().method_at(index);
185 assert(object_resolved_method->name() == resolved_method->name(),
186 "Object and interface method names should match at vtable index %d, %s != %s",
187 index, object_resolved_method->name()->as_C_string(), resolved_method->name()->as_C_string());
188 assert(object_resolved_method->signature() == resolved_method->signature(),
189 "Object and interface method signatures should match at vtable index %d, %s != %s",
190 index, object_resolved_method->signature()->as_C_string(), resolved_method->signature()->as_C_string());
191 #endif // ASSERT
192
193 kind = CallInfo::vtable_call;
194 } else {
195 // A regular interface call.
196 kind = CallInfo::itable_call;
197 index = resolved_method->itable_index();
198 }
199 assert(index == Method::nonvirtual_vtable_index || index >= 0, "bad index %d", index);
200 _call_kind = kind;
201 _call_index = index;
202 _resolved_appendix = Handle();
203 // Find or create a ResolvedMethod instance for this Method*
204 set_resolved_method_name(CHECK);
205
206 DEBUG_ONLY(verify());
207 }
208
209 void CallInfo::set_resolved_method_name(TRAPS) {
210 assert(_resolved_method() != nullptr, "Should already have a Method*");
211 oop rmethod_name = java_lang_invoke_ResolvedMethodName::find_resolved_method(_resolved_method, CHECK);
212 _resolved_method_name = Handle(THREAD, rmethod_name);
213 }
214
215 #ifdef ASSERT
216 void CallInfo::verify() {
217 switch (call_kind()) { // the meaning and allowed value of index depends on kind
218 case CallInfo::direct_call:
219 if (_call_index == Method::nonvirtual_vtable_index) break;
220 // else fall through to check vtable index:
221 case CallInfo::vtable_call:
222 assert(resolved_klass()->verify_vtable_index(_call_index), "");
223 break;
224 case CallInfo::itable_call:
225 assert(resolved_method()->method_holder()->verify_itable_index(_call_index), "");
226 break;
227 case CallInfo::unknown_kind:
228 assert(call_kind() != CallInfo::unknown_kind, "CallInfo must be set");
229 break;
230 default:
231 fatal("Unexpected call kind %d", call_kind());
232 }
233 }
234 #endif // ASSERT
235
236 #ifndef PRODUCT
237 void CallInfo::print() {
238 ResourceMark rm;
239 const char* kindstr;
240 switch (_call_kind) {
241 case direct_call: kindstr = "direct"; break;
242 case vtable_call: kindstr = "vtable"; break;
243 case itable_call: kindstr = "itable"; break;
244 default : kindstr = "unknown"; break;
245 }
246 tty->print_cr("Call %s@%d %s", kindstr, _call_index,
247 _resolved_method.is_null() ? "(none)" : _resolved_method->name_and_sig_as_C_string());
248 }
249 #endif
250
251 //------------------------------------------------------------------------------------------------------------------------
252 // Implementation of LinkInfo
253
254 LinkInfo::LinkInfo(const constantPoolHandle& pool, int index, const methodHandle& current_method, Bytecodes::Code code, TRAPS) {
255 // resolve klass
256 _resolved_klass = pool->klass_ref_at(index, code, CHECK);
257
258 // Get name, signature, and static klass
259 _name = pool->name_ref_at(index, code);
260 _signature = pool->signature_ref_at(index, code);
261 _tag = pool->tag_ref_at(index, code);
262 _current_klass = pool->pool_holder();
263 _current_method = current_method;
264
265 // Coming from the constant pool always checks access
266 _check_access = true;
267 _check_loader_constraints = true;
268 }
269
270 LinkInfo::LinkInfo(const constantPoolHandle& pool, int index, Bytecodes::Code code, TRAPS) {
271 // resolve klass
272 _resolved_klass = pool->klass_ref_at(index, code, CHECK);
273
274 // Get name, signature, and static klass
275 _name = pool->name_ref_at(index, code);
276 _signature = pool->signature_ref_at(index, code);
277 _tag = pool->tag_ref_at(index, code);
278 _current_klass = pool->pool_holder();
279 _current_method = methodHandle();
280
281 // Coming from the constant pool always checks access
282 _check_access = true;
283 _check_loader_constraints = true;
284 }
285
286 #ifndef PRODUCT
287 void LinkInfo::print() {
288 ResourceMark rm;
289 tty->print_cr("Link resolved_klass=%s name=%s signature=%s current_klass=%s check_access=%s check_loader_constraints=%s",
290 _resolved_klass->name()->as_C_string(),
291 _name->as_C_string(),
292 _signature->as_C_string(),
293 _current_klass == nullptr ? "(none)" : _current_klass->name()->as_C_string(),
294 _check_access ? "true" : "false",
295 _check_loader_constraints ? "true" : "false");
296
297 }
298 #endif // PRODUCT
299 //------------------------------------------------------------------------------------------------------------------------
300 // Klass resolution
301
302 void LinkResolver::check_klass_accessibility(Klass* ref_klass, Klass* sel_klass, TRAPS) {
303 Klass* base_klass = sel_klass;
304 if (sel_klass->is_objArray_klass()) {
305 base_klass = ObjArrayKlass::cast(sel_klass)->bottom_klass();
306 }
307 // The element type could be a typeArray - we only need the access
308 // check if it is a reference to another class.
309 if (!base_klass->is_instance_klass()) {
310 return; // no relevant check to do
311 }
312
313 Reflection::VerifyClassAccessResults vca_result =
314 Reflection::verify_class_access(ref_klass, InstanceKlass::cast(base_klass), true);
315 if (vca_result != Reflection::ACCESS_OK) {
316 ResourceMark rm(THREAD);
317 char* msg = Reflection::verify_class_access_msg(ref_klass,
318 InstanceKlass::cast(base_klass),
319 vca_result);
320 bool same_module = (base_klass->module() == ref_klass->module());
321 if (msg == nullptr) {
322 Exceptions::fthrow(
323 THREAD_AND_LOCATION,
324 vmSymbols::java_lang_IllegalAccessError(),
325 "failed to access class %s from class %s (%s%s%s)",
326 base_klass->external_name(),
327 ref_klass->external_name(),
328 (same_module) ? base_klass->joint_in_module_of_loader(ref_klass) : base_klass->class_in_module_of_loader(),
329 (same_module) ? "" : "; ",
330 (same_module) ? "" : ref_klass->class_in_module_of_loader());
331 } else {
332 // Use module specific message returned by verify_class_access_msg().
333 Exceptions::fthrow(
334 THREAD_AND_LOCATION,
335 vmSymbols::java_lang_IllegalAccessError(),
336 "%s", msg);
337 }
338 }
339 }
340
341 //------------------------------------------------------------------------------------------------------------------------
342 // Method resolution
343 //
344 // According to JVM spec. $5.4.3c & $5.4.3d
345
346 // Look up method in klasses, including static methods
347 // Then look up local default methods
348 Method* LinkResolver::lookup_method_in_klasses(const LinkInfo& link_info,
349 bool checkpolymorphism,
350 bool in_imethod_resolve) {
351 NoSafepointVerifier nsv; // Method* returned may not be reclaimed
352
353 Klass* klass = link_info.resolved_klass();
354 Symbol* name = link_info.name();
355 Symbol* signature = link_info.signature();
356
357 // Ignore overpasses so statics can be found during resolution
358 Method* result = klass->uncached_lookup_method(name, signature, Klass::OverpassLookupMode::skip);
359
360 if (klass->is_array_klass()) {
361 // Only consider klass and super klass for arrays
362 return result;
363 }
364
365 InstanceKlass* ik = InstanceKlass::cast(klass);
366
367 // JDK 8, JVMS 5.4.3.4: Interface method resolution should
368 // ignore static and non-public methods of java.lang.Object,
369 // like clone and finalize.
370 if (in_imethod_resolve &&
371 result != nullptr &&
372 ik->is_interface() &&
373 (result->is_static() || !result->is_public()) &&
374 result->method_holder() == vmClasses::Object_klass()) {
375 result = nullptr;
376 }
377
378 // Before considering default methods, check for an overpass in the
379 // current class if a method has not been found.
380 if (result == nullptr) {
381 result = ik->find_method(name, signature);
382 }
383
384 if (result == nullptr) {
385 Array<Method*>* default_methods = ik->default_methods();
386 if (default_methods != nullptr) {
387 result = InstanceKlass::find_method(default_methods, name, signature);
388 }
389 }
390
391 if (checkpolymorphism && result != nullptr) {
392 vmIntrinsics::ID iid = result->intrinsic_id();
393 if (MethodHandles::is_signature_polymorphic(iid)) {
394 // Do not link directly to these. The VM must produce a synthetic one using lookup_polymorphic_method.
395 return nullptr;
396 }
397 }
398 return result;
399 }
400
401 // returns first instance method
402 // Looks up method in classes, then looks up local default methods
403 Method* LinkResolver::lookup_instance_method_in_klasses(Klass* klass,
404 Symbol* name,
405 Symbol* signature,
406 Klass::PrivateLookupMode private_mode) {
407 Method* result = klass->uncached_lookup_method(name, signature, Klass::OverpassLookupMode::find, private_mode);
408
409 while (result != nullptr && result->is_static() && result->method_holder()->super() != nullptr) {
410 Klass* super_klass = result->method_holder()->super();
411 result = super_klass->uncached_lookup_method(name, signature, Klass::OverpassLookupMode::find, private_mode);
412 }
413
414 if (klass->is_array_klass()) {
415 // Only consider klass and super klass for arrays
416 return result;
417 }
418
419 if (result == nullptr) {
420 Array<Method*>* default_methods = InstanceKlass::cast(klass)->default_methods();
421 if (default_methods != nullptr) {
422 result = InstanceKlass::find_method(default_methods, name, signature);
423 assert(result == nullptr || !result->is_static(), "static defaults not allowed");
424 }
425 }
426 return result;
427 }
428
429 int LinkResolver::vtable_index_of_interface_method(Klass* klass, const methodHandle& resolved_method) {
430 InstanceKlass* ik = InstanceKlass::cast(klass);
431 return ik->vtable_index_of_interface_method(resolved_method());
432 }
433
434 Method* LinkResolver::lookup_method_in_interfaces(const LinkInfo& cp_info) {
435 InstanceKlass *ik = InstanceKlass::cast(cp_info.resolved_klass());
436
437 // Specify 'true' in order to skip default methods when searching the
438 // interfaces. Function lookup_method_in_klasses() already looked for
439 // the method in the default methods table.
440 return ik->lookup_method_in_all_interfaces(cp_info.name(), cp_info.signature(), Klass::DefaultsLookupMode::skip);
441 }
442
443 Method* LinkResolver::lookup_polymorphic_method(const LinkInfo& link_info,
444 Handle *appendix_result_or_null,
445 TRAPS) {
446 ResourceMark rm(THREAD);
447 Klass* klass = link_info.resolved_klass();
448 Symbol* name = link_info.name();
449 Symbol* full_signature = link_info.signature();
450 LogTarget(Info, methodhandles) lt_mh;
451
452 vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name);
453 log_info(methodhandles)("lookup_polymorphic_method iid=%s %s.%s%s",
454 vmIntrinsics::name_at(iid), klass->external_name(),
455 name->as_C_string(), full_signature->as_C_string());
456 if ((klass == vmClasses::MethodHandle_klass() ||
457 klass == vmClasses::VarHandle_klass()) &&
458 iid != vmIntrinsics::_none) {
459 if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) {
460 // Most of these do not need an up-call to Java to resolve, so can be done anywhere.
461 // Do not erase last argument type (MemberName) if it is a static linkTo method.
462 bool keep_last_arg = MethodHandles::is_signature_polymorphic_static(iid);
463 TempNewSymbol basic_signature =
464 MethodHandles::lookup_basic_type_signature(full_signature, keep_last_arg);
465 log_info(methodhandles)("lookup_polymorphic_method %s %s => basic %s",
466 name->as_C_string(),
467 full_signature->as_C_string(),
468 basic_signature->as_C_string());
469 Method* result = SystemDictionary::find_method_handle_intrinsic(iid,
470 basic_signature,
471 CHECK_NULL);
472 if (result != nullptr) {
473 assert(result->is_method_handle_intrinsic(), "MH.invokeBasic or MH.linkTo* intrinsic");
474 assert(result->intrinsic_id() != vmIntrinsics::_invokeGeneric, "wrong place to find this");
475 assert(basic_signature == result->signature(), "predict the result signature");
476 if (lt_mh.is_enabled()) {
477 LogStream ls(lt_mh);
478 ls.print("lookup_polymorphic_method => intrinsic ");
479 result->print_on(&ls);
480 }
481 }
482 return result;
483 } else if (iid == vmIntrinsics::_invokeGeneric
484 && THREAD->can_call_java()
485 && appendix_result_or_null != nullptr) {
486 // This is a method with type-checking semantics.
487 // We will ask Java code to spin an adapter method for it.
488 if (!MethodHandles::enabled()) {
489 // Make sure the Java part of the runtime has been booted up.
490 Klass* natives = vmClasses::MethodHandleNatives_klass();
491 if (natives == nullptr || InstanceKlass::cast(natives)->is_not_initialized()) {
492 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_invoke_MethodHandleNatives(),
493 Handle(),
494 Handle(),
495 true,
496 CHECK_NULL);
497 }
498 }
499
500 Handle appendix;
501 Method* result = SystemDictionary::find_method_handle_invoker(klass,
502 name,
503 full_signature,
504 link_info.current_klass(),
505 &appendix,
506 CHECK_NULL);
507 if (lt_mh.is_enabled()) {
508 LogStream ls(lt_mh);
509 ls.print("lookup_polymorphic_method => (via Java) ");
510 result->print_on(&ls);
511 ls.print(" lookup_polymorphic_method => appendix = ");
512 appendix.is_null() ? ls.print_cr("(none)") : appendix->print_on(&ls);
513 }
514 if (result != nullptr) {
515 #ifdef ASSERT
516 ResourceMark rm(THREAD);
517
518 TempNewSymbol basic_signature =
519 MethodHandles::lookup_basic_type_signature(full_signature);
520 int actual_size_of_params = result->size_of_parameters();
521 int expected_size_of_params = ArgumentSizeComputer(basic_signature).size();
522 // +1 for MethodHandle.this, +1 for trailing MethodType
523 if (!MethodHandles::is_signature_polymorphic_static(iid)) expected_size_of_params += 1;
524 if (appendix.not_null()) expected_size_of_params += 1;
525 if (actual_size_of_params != expected_size_of_params) {
526 tty->print_cr("*** basic_signature=%s", basic_signature->as_C_string());
527 tty->print_cr("*** result for %s: ", vmIntrinsics::name_at(iid));
528 result->print();
529 }
530 assert(actual_size_of_params == expected_size_of_params,
531 "%d != %d", actual_size_of_params, expected_size_of_params);
532 #endif //ASSERT
533
534 assert(appendix_result_or_null != nullptr, "");
535 (*appendix_result_or_null) = appendix;
536 }
537 return result;
538 }
539 }
540 return nullptr;
541 }
542
543 static void print_nest_host_error_on(stringStream* ss, Klass* ref_klass, Klass* sel_klass) {
544 assert(ref_klass->is_instance_klass(), "must be");
545 assert(sel_klass->is_instance_klass(), "must be");
546 InstanceKlass* ref_ik = InstanceKlass::cast(ref_klass);
547 InstanceKlass* sel_ik = InstanceKlass::cast(sel_klass);
548 const char* nest_host_error_1 = ref_ik->nest_host_error();
549 const char* nest_host_error_2 = sel_ik->nest_host_error();
550 if (nest_host_error_1 != nullptr || nest_host_error_2 != nullptr) {
551 ss->print(", (%s%s%s)",
552 (nest_host_error_1 != nullptr) ? nest_host_error_1 : "",
553 (nest_host_error_1 != nullptr && nest_host_error_2 != nullptr) ? ", " : "",
554 (nest_host_error_2 != nullptr) ? nest_host_error_2 : "");
555 }
556 }
557
558 void LinkResolver::check_method_accessability(Klass* ref_klass,
559 Klass* resolved_klass,
560 Klass* sel_klass,
561 const methodHandle& sel_method,
562 TRAPS) {
563
564 AccessFlags flags = sel_method->access_flags();
565
566 // Special case: arrays always override "clone". JVMS 2.15.
567 // If the resolved klass is an array class, and the declaring class
568 // is java.lang.Object and the method is "clone", set the flags
569 // to public.
570 //
571 // We'll check for the method name first, as that's most likely
572 // to be false (so we'll short-circuit out of these tests).
573 if (sel_method->name() == vmSymbols::clone_name() &&
574 sel_klass == vmClasses::Object_klass() &&
575 resolved_klass->is_array_klass()) {
576 // We need to change "protected" to "public".
577 assert(flags.is_protected(), "clone not protected?");
578 jint new_flags = flags.as_int();
579 new_flags = new_flags & (~JVM_ACC_PROTECTED);
580 new_flags = new_flags | JVM_ACC_PUBLIC;
581 flags.set_flags(new_flags);
582 }
583 // assert(extra_arg_result_or_null != nullptr, "must be able to return extra argument");
584
585 bool can_access = Reflection::verify_member_access(ref_klass,
586 resolved_klass,
587 sel_klass,
588 flags,
589 true, false, CHECK);
590 // Any existing exceptions that may have been thrown
591 // have been allowed to propagate.
592 if (!can_access) {
593 ResourceMark rm(THREAD);
594 stringStream ss;
595 bool same_module = (sel_klass->module() == ref_klass->module());
596 ss.print("class %s tried to access %s%s%smethod '%s' (%s%s%s)",
597 ref_klass->external_name(),
598 sel_method->is_abstract() ? "abstract " : "",
599 sel_method->is_protected() ? "protected " : "",
600 sel_method->is_private() ? "private " : "",
601 sel_method->external_name(),
602 (same_module) ? ref_klass->joint_in_module_of_loader(sel_klass) : ref_klass->class_in_module_of_loader(),
603 (same_module) ? "" : "; ",
604 (same_module) ? "" : sel_klass->class_in_module_of_loader()
605 );
606
607 // For private access see if there was a problem with nest host
608 // resolution, and if so report that as part of the message.
609 if (sel_method->is_private()) {
610 print_nest_host_error_on(&ss, ref_klass, sel_klass);
611 }
612
613 Exceptions::fthrow(THREAD_AND_LOCATION,
614 vmSymbols::java_lang_IllegalAccessError(),
615 "%s",
616 ss.as_string()
617 );
618 return;
619 }
620 }
621
622 void LinkResolver::resolve_continuation_enter(CallInfo& callinfo, TRAPS) {
623 Klass* resolved_klass = vmClasses::Continuation_klass();
624 Symbol* method_name = vmSymbols::enter_name();
625 Symbol* method_signature = vmSymbols::continuationEnter_signature();
626 Klass* current_klass = resolved_klass;
627 LinkInfo link_info(resolved_klass, method_name, method_signature, current_klass);
628 Method* resolved_method = resolve_method(link_info, Bytecodes::_invokestatic, CHECK);
629 callinfo.set_static(resolved_klass, methodHandle(THREAD, resolved_method), CHECK);
630 }
631
632 Method* LinkResolver::resolve_method_statically(Bytecodes::Code code,
633 const constantPoolHandle& pool, int index, TRAPS) {
634 // This method is used only
635 // (1) in C2 from InlineTree::ok_to_inline (via ciMethod::check_call),
636 // and
637 // (2) in Bytecode_invoke::static_target
638 // It appears to fail when applied to an invokeinterface call site.
639 // FIXME: Remove this method and ciMethod::check_call; refactor to use the other LinkResolver entry points.
640 // resolve klass
641 if (code == Bytecodes::_invokedynamic) {
642 Klass* resolved_klass = vmClasses::MethodHandle_klass();
643 Symbol* method_name = vmSymbols::invoke_name();
644 Symbol* method_signature = pool->signature_ref_at(index, code);
645 Klass* current_klass = pool->pool_holder();
646 LinkInfo link_info(resolved_klass, method_name, method_signature, current_klass);
647 return resolve_method(link_info, code, THREAD);
648 }
649
650 LinkInfo link_info(pool, index, methodHandle(), code, CHECK_NULL);
651 Klass* resolved_klass = link_info.resolved_klass();
652
653 if (pool->has_preresolution()
654 || ((resolved_klass == vmClasses::MethodHandle_klass() || resolved_klass == vmClasses::VarHandle_klass()) &&
655 MethodHandles::is_signature_polymorphic_name(resolved_klass, link_info.name()))) {
656 Method* result = ConstantPool::method_at_if_loaded(pool, index);
657 if (result != nullptr) {
658 return result;
659 }
660 }
661
662 if (code == Bytecodes::_invokeinterface) {
663 return resolve_interface_method(link_info, code, THREAD);
664 } else if (code == Bytecodes::_invokevirtual) {
665 return resolve_method(link_info, code, THREAD);
666 } else if (!resolved_klass->is_interface()) {
667 return resolve_method(link_info, code, THREAD);
668 } else {
669 return resolve_interface_method(link_info, code, THREAD);
670 }
671 }
672
673 // Check and print a loader constraint violation message for method or interface method
674 void LinkResolver::check_method_loader_constraints(const LinkInfo& link_info,
675 const methodHandle& resolved_method,
676 const char* method_type, TRAPS) {
677 Handle current_loader(THREAD, link_info.current_klass()->class_loader());
678 Handle resolved_loader(THREAD, resolved_method->method_holder()->class_loader());
679
680 ResourceMark rm(THREAD);
681 Symbol* failed_type_symbol =
682 SystemDictionary::check_signature_loaders(link_info.signature(),
683 /*klass_being_linked*/ nullptr, // We are not linking class
684 current_loader,
685 resolved_loader, true);
686 if (failed_type_symbol != nullptr) {
687 Klass* current_class = link_info.current_klass();
688 ClassLoaderData* current_loader_data = current_class->class_loader_data();
689 assert(current_loader_data != nullptr, "current class has no class loader data");
690 Klass* resolved_method_class = resolved_method->method_holder();
691 ClassLoaderData* target_loader_data = resolved_method_class->class_loader_data();
692 assert(target_loader_data != nullptr, "resolved method's class has no class loader data");
693
694 stringStream ss;
695 ss.print("loader constraint violation: when resolving %s '", method_type);
696 Method::print_external_name(&ss, link_info.resolved_klass(), link_info.name(), link_info.signature());
697 ss.print("' the class loader %s of the current class, %s,"
698 " and the class loader %s for the method's defining class, %s, have"
699 " different Class objects for the type %s used in the signature (%s; %s)",
700 current_loader_data->loader_name_and_id(),
701 current_class->name()->as_C_string(),
702 target_loader_data->loader_name_and_id(),
703 resolved_method_class->name()->as_C_string(),
704 failed_type_symbol->as_C_string(),
705 current_class->class_in_module_of_loader(false, true),
706 resolved_method_class->class_in_module_of_loader(false, true));
707 THROW_MSG(vmSymbols::java_lang_LinkageError(), ss.as_string());
708 }
709 }
710
711 void LinkResolver::check_field_loader_constraints(Symbol* field, Symbol* sig,
712 Klass* current_klass,
713 Klass* sel_klass, TRAPS) {
714 Handle ref_loader(THREAD, current_klass->class_loader());
715 Handle sel_loader(THREAD, sel_klass->class_loader());
716
717 ResourceMark rm(THREAD); // needed for check_signature_loaders
718 Symbol* failed_type_symbol =
719 SystemDictionary::check_signature_loaders(sig,
720 /*klass_being_linked*/ nullptr, // We are not linking class
721 ref_loader, sel_loader,
722 false);
723 if (failed_type_symbol != nullptr) {
724 stringStream ss;
725 const char* failed_type_name = failed_type_symbol->as_klass_external_name();
726
727 ss.print("loader constraint violation: when resolving field \"%s\" of type %s, "
728 "the class loader %s of the current class, %s, "
729 "and the class loader %s for the field's defining %s, %s, "
730 "have different Class objects for type %s (%s; %s)",
731 field->as_C_string(),
732 failed_type_name,
733 current_klass->class_loader_data()->loader_name_and_id(),
734 current_klass->external_name(),
735 sel_klass->class_loader_data()->loader_name_and_id(),
736 sel_klass->external_kind(),
737 sel_klass->external_name(),
738 failed_type_name,
739 current_klass->class_in_module_of_loader(false, true),
740 sel_klass->class_in_module_of_loader(false, true));
741 THROW_MSG(vmSymbols::java_lang_LinkageError(), ss.as_string());
742 }
743 }
744
745 Method* LinkResolver::resolve_method(const LinkInfo& link_info,
746 Bytecodes::Code code, TRAPS) {
747
748 Handle nested_exception;
749 Klass* resolved_klass = link_info.resolved_klass();
750
751 // 1. For invokevirtual, cannot call an interface method
752 if (code == Bytecodes::_invokevirtual && resolved_klass->is_interface()) {
753 ResourceMark rm(THREAD);
754 char buf[200];
755 jio_snprintf(buf, sizeof(buf), "Found interface %s, but class was expected",
756 resolved_klass->external_name());
757 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
758 }
759
760 // 2. check constant pool tag for called method - must be JVM_CONSTANT_Methodref
761 if (!link_info.tag().is_invalid() && !link_info.tag().is_method()) {
762 ResourceMark rm(THREAD);
763 stringStream ss;
764 ss.print("Method '");
765 Method::print_external_name(&ss, link_info.resolved_klass(), link_info.name(), link_info.signature());
766 ss.print("' must be Methodref constant");
767 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
768 }
769
770 // 3. lookup method in resolved klass and its super klasses
771 methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, true, false));
772
773 // 4. lookup method in all the interfaces implemented by the resolved klass
774 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) { // not found in the class hierarchy
775 resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info));
776
777 if (resolved_method.is_null()) {
778 // JSR 292: see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc
779 Method* method = lookup_polymorphic_method(link_info, (Handle*)nullptr, THREAD);
780 resolved_method = methodHandle(THREAD, method);
781 if (HAS_PENDING_EXCEPTION) {
782 nested_exception = Handle(THREAD, PENDING_EXCEPTION);
783 CLEAR_PENDING_EXCEPTION;
784 }
785 }
786 }
787
788 // 5. method lookup failed
789 if (resolved_method.is_null()) {
790 ResourceMark rm(THREAD);
791 stringStream ss;
792 ss.print("'");
793 Method::print_external_name(&ss, resolved_klass, link_info.name(), link_info.signature());
794 ss.print("'");
795 THROW_MSG_CAUSE_(vmSymbols::java_lang_NoSuchMethodError(),
796 ss.as_string(), nested_exception, nullptr);
797 }
798
799 // 6. access checks, access checking may be turned off when calling from within the VM.
800 Klass* current_klass = link_info.current_klass();
801 if (link_info.check_access()) {
802 assert(current_klass != nullptr , "current_klass should not be null");
803
804 // check if method can be accessed by the referring class
805 check_method_accessability(current_klass,
806 resolved_klass,
807 resolved_method->method_holder(),
808 resolved_method,
809 CHECK_NULL);
810 }
811 if (link_info.check_loader_constraints()) {
812 // check loader constraints
813 check_method_loader_constraints(link_info, resolved_method, "method", CHECK_NULL);
814 }
815
816 return resolved_method();
817 }
818
819 static void trace_method_resolution(const char* prefix,
820 Klass* klass,
821 Klass* resolved_klass,
822 Method* method,
823 bool logitables,
824 int index = -1) {
825 #ifndef PRODUCT
826 ResourceMark rm;
827 Log(itables) logi;
828 LogStream lsi(logi.trace());
829 Log(vtables) logv;
830 LogStream lsv(logv.trace());
831 outputStream* st;
832 if (logitables) {
833 st = &lsi;
834 } else {
835 st = &lsv;
836 }
837 st->print("%s%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ",
838 prefix,
839 (klass == nullptr ? "<null>" : klass->internal_name()),
840 resolved_klass->internal_name(),
841 Method::name_and_sig_as_C_string(resolved_klass,
842 method->name(),
843 method->signature()),
844 method->method_holder()->internal_name());
845 method->print_linkage_flags(st);
846 if (index != -1) {
847 st->print("vtable_index:%d", index);
848 }
849 st->cr();
850 #endif // PRODUCT
851 }
852
853 // Do linktime resolution of a method in the interface within the context of the specified bytecode.
854 Method* LinkResolver::resolve_interface_method(const LinkInfo& link_info, Bytecodes::Code code, TRAPS) {
855
856 Klass* resolved_klass = link_info.resolved_klass();
857
858 // check if klass is interface
859 if (!resolved_klass->is_interface()) {
860 ResourceMark rm(THREAD);
861 char buf[200];
862 jio_snprintf(buf, sizeof(buf), "Found class %s, but interface was expected", resolved_klass->external_name());
863 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
864 }
865
866 // check constant pool tag for called method - must be JVM_CONSTANT_InterfaceMethodref
867 if (!link_info.tag().is_invalid() && !link_info.tag().is_interface_method()) {
868 ResourceMark rm(THREAD);
869 stringStream ss;
870 ss.print("Method '");
871 Method::print_external_name(&ss, link_info.resolved_klass(), link_info.name(), link_info.signature());
872 ss.print("' must be InterfaceMethodref constant");
873 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
874 }
875
876 // lookup method in this interface or its super, java.lang.Object
877 // JDK8: also look for static methods
878 methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, false, true));
879
880 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) {
881 // lookup method in all the super-interfaces
882 resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info));
883 }
884
885 if (resolved_method.is_null()) {
886 // no method found
887 ResourceMark rm(THREAD);
888 stringStream ss;
889 ss.print("'");
890 Method::print_external_name(&ss, resolved_klass, link_info.name(), link_info.signature());
891 ss.print("'");
892 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), ss.as_string());
893 }
894
895 if (link_info.check_access()) {
896 // JDK8 adds non-public interface methods, and accessability check requirement
897 Klass* current_klass = link_info.current_klass();
898
899 assert(current_klass != nullptr , "current_klass should not be null");
900
901 // check if method can be accessed by the referring class
902 check_method_accessability(current_klass,
903 resolved_klass,
904 resolved_method->method_holder(),
905 resolved_method,
906 CHECK_NULL);
907 }
908 if (link_info.check_loader_constraints()) {
909 check_method_loader_constraints(link_info, resolved_method, "interface method", CHECK_NULL);
910 }
911
912 if (code != Bytecodes::_invokestatic && resolved_method->is_static()) {
913 ResourceMark rm(THREAD);
914 stringStream ss;
915 ss.print("Expected instance not static method '");
916 Method::print_external_name(&ss, resolved_klass,
917 resolved_method->name(), resolved_method->signature());
918 ss.print("'");
919 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
920 }
921
922 if (log_develop_is_enabled(Trace, itables)) {
923 char buf[200];
924 jio_snprintf(buf, sizeof(buf), "%s resolved interface method: caller-class:",
925 Bytecodes::name(code));
926 trace_method_resolution(buf, link_info.current_klass(), resolved_klass, resolved_method(), true);
927 }
928
929 return resolved_method();
930 }
931
932 //------------------------------------------------------------------------------------------------------------------------
933 // Field resolution
934
935 void LinkResolver::check_field_accessability(Klass* ref_klass,
936 Klass* resolved_klass,
937 Klass* sel_klass,
938 const fieldDescriptor& fd,
939 TRAPS) {
940 bool can_access = Reflection::verify_member_access(ref_klass,
941 resolved_klass,
942 sel_klass,
943 fd.access_flags(),
944 true, false, CHECK);
945 // Any existing exceptions that may have been thrown, for example LinkageErrors
946 // from nest-host resolution, have been allowed to propagate.
947 if (!can_access) {
948 bool same_module = (sel_klass->module() == ref_klass->module());
949 ResourceMark rm(THREAD);
950 stringStream ss;
951 ss.print("class %s tried to access %s%sfield %s.%s (%s%s%s)",
952 ref_klass->external_name(),
953 fd.is_protected() ? "protected " : "",
954 fd.is_private() ? "private " : "",
955 sel_klass->external_name(),
956 fd.name()->as_C_string(),
957 (same_module) ? ref_klass->joint_in_module_of_loader(sel_klass) : ref_klass->class_in_module_of_loader(),
958 (same_module) ? "" : "; ",
959 (same_module) ? "" : sel_klass->class_in_module_of_loader()
960 );
961 // For private access see if there was a problem with nest host
962 // resolution, and if so report that as part of the message.
963 if (fd.is_private()) {
964 print_nest_host_error_on(&ss, ref_klass, sel_klass);
965 }
966 Exceptions::fthrow(THREAD_AND_LOCATION,
967 vmSymbols::java_lang_IllegalAccessError(),
968 "%s",
969 ss.as_string()
970 );
971 return;
972 }
973 }
974
975 void LinkResolver::resolve_field_access(fieldDescriptor& fd, const constantPoolHandle& pool, int index, const methodHandle& method, Bytecodes::Code byte, TRAPS) {
976 LinkInfo link_info(pool, index, method, byte, CHECK);
977 resolve_field(fd, link_info, byte, true, CHECK);
978 }
979
980 void LinkResolver::resolve_field(fieldDescriptor& fd,
981 const LinkInfo& link_info,
982 Bytecodes::Code byte, bool initialize_class,
983 TRAPS) {
984 assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic ||
985 byte == Bytecodes::_getfield || byte == Bytecodes::_putfield ||
986 byte == Bytecodes::_nofast_getfield || byte == Bytecodes::_nofast_putfield ||
987 (byte == Bytecodes::_nop && !link_info.check_access()), "bad field access bytecode");
988
989 bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic);
990 bool is_put = (byte == Bytecodes::_putfield || byte == Bytecodes::_putstatic || byte == Bytecodes::_nofast_putfield);
991 // Check if there's a resolved klass containing the field
992 Klass* resolved_klass = link_info.resolved_klass();
993 Symbol* field = link_info.name();
994 Symbol* sig = link_info.signature();
995
996 // Resolve instance field
997 Klass* sel_klass = resolved_klass->find_field(field, sig, &fd);
998 // check if field exists; i.e., if a klass containing the field def has been selected
999 if (sel_klass == nullptr) {
1000 ResourceMark rm(THREAD);
1001 stringStream ss;
1002 ss.print("Class %s does not have member field '", resolved_klass->external_name());
1003 sig->print_as_field_external_type(&ss);
1004 ss.print(" %s'", field->as_C_string());
1005 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), ss.as_string());
1006 }
1007
1008 // Access checking may be turned off when calling from within the VM.
1009 Klass* current_klass = link_info.current_klass();
1010 if (link_info.check_access()) {
1011
1012 // check access
1013 check_field_accessability(current_klass, resolved_klass, sel_klass, fd, CHECK);
1014
1015 // check for errors
1016 if (is_static != fd.is_static()) {
1017 ResourceMark rm(THREAD);
1018 char msg[200];
1019 jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string());
1020 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg);
1021 }
1022
1023 // A final field can be modified only
1024 // (1) by methods declared in the class declaring the field and
1025 // (2) by the <clinit> method (in case of a static field)
1026 // or by the <init> method (in case of an instance field).
1027 if (is_put && fd.access_flags().is_final()) {
1028
1029 if (sel_klass != current_klass) {
1030 ResourceMark rm(THREAD);
1031 stringStream ss;
1032 ss.print("Update to %s final field %s.%s attempted from a different class (%s) than the field's declaring class",
1033 is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(),
1034 current_klass->external_name());
1035 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
1036 }
1037
1038 if (fd.constants()->pool_holder()->major_version() >= 53) {
1039 Method* m = link_info.current_method();
1040 assert(m != nullptr, "information about the current method must be available for 'put' bytecodes");
1041 bool is_initialized_static_final_update = (byte == Bytecodes::_putstatic &&
1042 fd.is_static() &&
1043 !m->is_static_initializer());
1044 bool is_initialized_instance_final_update = ((byte == Bytecodes::_putfield || byte == Bytecodes::_nofast_putfield) &&
1045 !fd.is_static() &&
1046 !m->is_object_initializer());
1047
1048 if (is_initialized_static_final_update || is_initialized_instance_final_update) {
1049 ResourceMark rm(THREAD);
1050 stringStream ss;
1051 ss.print("Update to %s final field %s.%s attempted from a different method (%s) than the initializer method %s ",
1052 is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(),
1053 m->name()->as_C_string(),
1054 is_static ? "<clinit>" : "<init>");
1055 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
1056 }
1057 }
1058 }
1059
1060 // initialize resolved_klass if necessary
1061 // note 1: the klass which declared the field must be initialized (i.e, sel_klass)
1062 // according to the newest JVM spec (5.5, p.170) - was bug (gri 7/28/99)
1063 //
1064 // note 2: we don't want to force initialization if we are just checking
1065 // if the field access is legal; e.g., during compilation
1066 if (is_static && initialize_class) {
1067 sel_klass->initialize(CHECK);
1068 }
1069 }
1070
1071 if (link_info.check_loader_constraints() && (sel_klass != current_klass) && (current_klass != nullptr)) {
1072 check_field_loader_constraints(field, sig, current_klass, sel_klass, CHECK);
1073 }
1074
1075 // return information. note that the klass is set to the actual klass containing the
1076 // field, otherwise access of static fields in superclasses will not work.
1077 }
1078
1079
1080 //------------------------------------------------------------------------------------------------------------------------
1081 // Invoke resolution
1082 //
1083 // Naming conventions:
1084 //
1085 // resolved_method the specified method (i.e., static receiver specified via constant pool index)
1086 // sel_method the selected method (selected via run-time lookup; e.g., based on dynamic receiver class)
1087 // resolved_klass the specified klass (i.e., specified via constant pool index)
1088 // recv_klass the receiver klass
1089
1090
1091 void LinkResolver::resolve_static_call(CallInfo& result,
1092 const LinkInfo& link_info,
1093 bool initialize_class, TRAPS) {
1094 Method* resolved_method = linktime_resolve_static_method(link_info, CHECK);
1095
1096 // The resolved class can change as a result of this resolution.
1097 Klass* resolved_klass = resolved_method->method_holder();
1098
1099 // Initialize klass (this should only happen if everything is ok)
1100 if (initialize_class && resolved_klass->should_be_initialized()) {
1101 resolved_klass->initialize(CHECK);
1102 // Use updated LinkInfo to reresolve with resolved method holder
1103 LinkInfo new_info(resolved_klass, link_info.name(), link_info.signature(),
1104 link_info.current_klass(),
1105 link_info.check_access() ? LinkInfo::AccessCheck::required : LinkInfo::AccessCheck::skip,
1106 link_info.check_loader_constraints() ? LinkInfo::LoaderConstraintCheck::required : LinkInfo::LoaderConstraintCheck::skip);
1107 resolved_method = linktime_resolve_static_method(new_info, CHECK);
1108 }
1109
1110 // setup result
1111 result.set_static(resolved_klass, methodHandle(THREAD, resolved_method), CHECK);
1112 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1113 }
1114
1115 // throws linktime exceptions
1116 Method* LinkResolver::linktime_resolve_static_method(const LinkInfo& link_info, TRAPS) {
1117
1118 Klass* resolved_klass = link_info.resolved_klass();
1119 Method* resolved_method;
1120 if (!resolved_klass->is_interface()) {
1121 resolved_method = resolve_method(link_info, Bytecodes::_invokestatic, CHECK_NULL);
1122 } else {
1123 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokestatic, CHECK_NULL);
1124 }
1125 assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier");
1126
1127 // check if static
1128 if (!resolved_method->is_static()) {
1129 ResourceMark rm(THREAD);
1130 stringStream ss;
1131 ss.print("Expected static method '");
1132 resolved_method->print_external_name(&ss);
1133 ss.print("'");
1134 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1135 }
1136 return resolved_method;
1137 }
1138
1139
1140 void LinkResolver::resolve_special_call(CallInfo& result,
1141 Handle recv,
1142 const LinkInfo& link_info,
1143 TRAPS) {
1144 Method* resolved_method = linktime_resolve_special_method(link_info, CHECK);
1145 runtime_resolve_special_method(result, link_info, methodHandle(THREAD, resolved_method), recv, CHECK);
1146 }
1147
1148 // throws linktime exceptions
1149 Method* LinkResolver::linktime_resolve_special_method(const LinkInfo& link_info, TRAPS) {
1150
1151 // Invokespecial is called for multiple special reasons:
1152 // <init>
1153 // local private method invocation, for classes and interfaces
1154 // superclass.method, which can also resolve to a default method
1155 // and the selected method is recalculated relative to the direct superclass
1156 // superinterface.method, which explicitly does not check shadowing
1157 Klass* resolved_klass = link_info.resolved_klass();
1158 Method* resolved_method = nullptr;
1159
1160 if (!resolved_klass->is_interface()) {
1161 resolved_method = resolve_method(link_info, Bytecodes::_invokespecial, CHECK_NULL);
1162 } else {
1163 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokespecial, CHECK_NULL);
1164 }
1165
1166 // check if method name is <init>, that it is found in same klass as static type
1167 if (resolved_method->name() == vmSymbols::object_initializer_name() &&
1168 resolved_method->method_holder() != resolved_klass) {
1169 ResourceMark rm(THREAD);
1170 stringStream ss;
1171 ss.print("%s: method '", resolved_klass->external_name());
1172 resolved_method->signature()->print_as_signature_external_return_type(&ss);
1173 ss.print(" %s(", resolved_method->name()->as_C_string());
1174 resolved_method->signature()->print_as_signature_external_parameters(&ss);
1175 ss.print(")' not found");
1176 Exceptions::fthrow(
1177 THREAD_AND_LOCATION,
1178 vmSymbols::java_lang_NoSuchMethodError(),
1179 "%s", ss.as_string());
1180 return nullptr;
1181 }
1182
1183 // ensure that invokespecial's interface method reference is in
1184 // a direct superinterface, not an indirect superinterface
1185 Klass* current_klass = link_info.current_klass();
1186 if (current_klass != nullptr && resolved_klass->is_interface()) {
1187 InstanceKlass* klass_to_check = InstanceKlass::cast(current_klass);
1188 // Disable verification for the dynamically-generated reflection bytecodes
1189 // for serialization constructor accessor.
1190 bool is_reflect = klass_to_check->is_subclass_of(
1191 vmClasses::reflect_SerializationConstructorAccessorImpl_klass());
1192
1193 if (!is_reflect &&
1194 !klass_to_check->is_same_or_direct_interface(resolved_klass)) {
1195 ResourceMark rm(THREAD);
1196 stringStream ss;
1197 ss.print("Interface method reference: '");
1198 resolved_method->print_external_name(&ss);
1199 ss.print("', is in an indirect superinterface of %s",
1200 current_klass->external_name());
1201 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1202 }
1203 }
1204
1205 // check if not static
1206 if (resolved_method->is_static()) {
1207 ResourceMark rm(THREAD);
1208 stringStream ss;
1209 ss.print("Expecting non-static method '");
1210 resolved_method->print_external_name(&ss);
1211 ss.print("'");
1212 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1213 }
1214
1215 if (log_develop_is_enabled(Trace, itables)) {
1216 trace_method_resolution("invokespecial resolved method: caller-class:",
1217 current_klass, resolved_klass, resolved_method, true);
1218 }
1219
1220 return resolved_method;
1221 }
1222
1223 // throws runtime exceptions
1224 void LinkResolver::runtime_resolve_special_method(CallInfo& result,
1225 const LinkInfo& link_info,
1226 const methodHandle& resolved_method,
1227 Handle recv, TRAPS) {
1228
1229 Klass* resolved_klass = link_info.resolved_klass();
1230
1231 // resolved method is selected method unless we have an old-style lookup
1232 // for a superclass method
1233 // Invokespecial for a superinterface, resolved method is selected method,
1234 // no checks for shadowing
1235 methodHandle sel_method(THREAD, resolved_method());
1236
1237 if (link_info.check_access() &&
1238 // check if the method is not <init>
1239 resolved_method->name() != vmSymbols::object_initializer_name()) {
1240
1241 Klass* current_klass = link_info.current_klass();
1242
1243 // Check if the class of the resolved_klass is a superclass
1244 // (not supertype in order to exclude interface classes) of the current class.
1245 // This check is not performed for super.invoke for interface methods
1246 // in super interfaces.
1247 if (current_klass->is_subclass_of(resolved_klass) &&
1248 current_klass != resolved_klass) {
1249 // Lookup super method
1250 Klass* super_klass = current_klass->super();
1251 Method* instance_method = lookup_instance_method_in_klasses(super_klass,
1252 resolved_method->name(),
1253 resolved_method->signature(),
1254 Klass::PrivateLookupMode::find);
1255 sel_method = methodHandle(THREAD, instance_method);
1256
1257 // check if found
1258 if (sel_method.is_null()) {
1259 ResourceMark rm(THREAD);
1260 stringStream ss;
1261 ss.print("'");
1262 resolved_method->print_external_name(&ss);
1263 ss.print("'");
1264 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1265 // check loader constraints if found a different method
1266 } else if (link_info.check_loader_constraints() && sel_method() != resolved_method()) {
1267 check_method_loader_constraints(link_info, sel_method, "method", CHECK);
1268 }
1269 }
1270
1271 // Check that the class of objectref (the receiver) is the current class or interface,
1272 // or a subtype of the current class or interface (the sender), otherwise invokespecial
1273 // throws IllegalAccessError.
1274 // The verifier checks that the sender is a subtype of the class in the I/MR operand.
1275 // The verifier also checks that the receiver is a subtype of the sender, if the sender is
1276 // a class. If the sender is an interface, the check has to be performed at runtime.
1277 InstanceKlass* sender = InstanceKlass::cast(current_klass);
1278 if (sender->is_interface() && recv.not_null()) {
1279 Klass* receiver_klass = recv->klass();
1280 if (!receiver_klass->is_subtype_of(sender)) {
1281 ResourceMark rm(THREAD);
1282 char buf[500];
1283 jio_snprintf(buf, sizeof(buf),
1284 "Receiver class %s must be the current class or a subtype of interface %s",
1285 receiver_klass->external_name(),
1286 sender->external_name());
1287 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), buf);
1288 }
1289 }
1290 }
1291
1292 // check if not static
1293 if (sel_method->is_static()) {
1294 ResourceMark rm(THREAD);
1295 stringStream ss;
1296 ss.print("Expecting non-static method '");
1297 resolved_method->print_external_name(&ss);
1298 ss.print("'");
1299 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1300 }
1301
1302 // check if abstract
1303 if (sel_method->is_abstract()) {
1304 ResourceMark rm(THREAD);
1305 stringStream ss;
1306 ss.print("'");
1307 Method::print_external_name(&ss, resolved_klass, sel_method->name(), sel_method->signature());
1308 ss.print("'");
1309 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1310 }
1311
1312 if (log_develop_is_enabled(Trace, itables)) {
1313 trace_method_resolution("invokespecial selected method: resolved-class:",
1314 resolved_klass, resolved_klass, sel_method(), true);
1315 }
1316
1317 // setup result
1318 result.set_static(resolved_klass, sel_method, CHECK);
1319 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1320 }
1321
1322 void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, Klass* receiver_klass,
1323 const LinkInfo& link_info,
1324 bool check_null_and_abstract, TRAPS) {
1325 Method* resolved_method = linktime_resolve_virtual_method(link_info, CHECK);
1326 runtime_resolve_virtual_method(result, methodHandle(THREAD, resolved_method),
1327 link_info.resolved_klass(),
1328 recv, receiver_klass,
1329 check_null_and_abstract, CHECK);
1330 }
1331
1332 // throws linktime exceptions
1333 Method* LinkResolver::linktime_resolve_virtual_method(const LinkInfo& link_info,
1334 TRAPS) {
1335 // normal method resolution
1336 Method* resolved_method = resolve_method(link_info, Bytecodes::_invokevirtual, CHECK_NULL);
1337
1338 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1339 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1340
1341 // check if private interface method
1342 Klass* resolved_klass = link_info.resolved_klass();
1343 Klass* current_klass = link_info.current_klass();
1344
1345 // This is impossible, if resolve_klass is an interface, we've thrown icce in resolve_method
1346 if (resolved_klass->is_interface() && resolved_method->is_private()) {
1347 ResourceMark rm(THREAD);
1348 stringStream ss;
1349 ss.print("private interface method requires invokespecial, not invokevirtual: method '");
1350 resolved_method->print_external_name(&ss);
1351 ss.print("', caller-class: %s",
1352 (current_klass == nullptr ? "<null>" : current_klass->internal_name()));
1353 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1354 }
1355
1356 // check if not static
1357 if (resolved_method->is_static()) {
1358 ResourceMark rm(THREAD);
1359 stringStream ss;
1360 ss.print("Expecting non-static method '");
1361 resolved_method->print_external_name(&ss);
1362 ss.print("'");
1363 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1364 }
1365
1366 if (log_develop_is_enabled(Trace, vtables)) {
1367 trace_method_resolution("invokevirtual resolved method: caller-class:",
1368 current_klass, resolved_klass, resolved_method, false);
1369 }
1370
1371 return resolved_method;
1372 }
1373
1374 // throws runtime exceptions
1375 void LinkResolver::runtime_resolve_virtual_method(CallInfo& result,
1376 const methodHandle& resolved_method,
1377 Klass* resolved_klass,
1378 Handle recv,
1379 Klass* recv_klass,
1380 bool check_null_and_abstract,
1381 TRAPS) {
1382
1383 // setup default return values
1384 int vtable_index = Method::invalid_vtable_index;
1385 methodHandle selected_method;
1386
1387 // runtime method resolution
1388 if (check_null_and_abstract && recv.is_null()) { // check if receiver exists
1389 THROW(vmSymbols::java_lang_NullPointerException());
1390 }
1391
1392 // Virtual methods cannot be resolved before its klass has been linked, for otherwise the Method*'s
1393 // has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since
1394 // a missing receiver might result in a bogus lookup.
1395 assert(resolved_method->method_holder()->is_linked(), "must be linked");
1396
1397 // do lookup based on receiver klass using the vtable index
1398 if (resolved_method->method_holder()->is_interface()) { // default or miranda method
1399 vtable_index = vtable_index_of_interface_method(resolved_klass, resolved_method);
1400 assert(vtable_index >= 0 , "we should have valid vtable index at this point");
1401
1402 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1403 } else {
1404 // at this point we are sure that resolved_method is virtual and not
1405 // a default or miranda method; therefore, it must have a valid vtable index.
1406 assert(!resolved_method->has_itable_index(), "");
1407 vtable_index = resolved_method->vtable_index();
1408 // We could get a negative vtable_index of nonvirtual_vtable_index for private
1409 // methods, or for final methods. Private methods never appear in the vtable
1410 // and never override other methods. As an optimization, final methods are
1411 // never put in the vtable, unless they override an existing method.
1412 // So if we do get nonvirtual_vtable_index, it means the selected method is the
1413 // resolved method, and it can never be changed by an override.
1414 if (vtable_index == Method::nonvirtual_vtable_index) {
1415 assert(resolved_method->can_be_statically_bound(), "cannot override this method");
1416 selected_method = resolved_method;
1417 } else {
1418 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1419 }
1420 }
1421
1422 // check if method exists
1423 if (selected_method.is_null()) {
1424 throw_abstract_method_error(resolved_method, recv_klass, CHECK);
1425 }
1426
1427 // check if abstract
1428 if (check_null_and_abstract && selected_method->is_abstract()) {
1429 // Pass arguments for generating a verbose error message.
1430 throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK);
1431 }
1432
1433 if (log_develop_is_enabled(Trace, vtables)) {
1434 trace_method_resolution("invokevirtual selected method: receiver-class:",
1435 recv_klass, resolved_klass, selected_method(),
1436 false, vtable_index);
1437 }
1438 // setup result
1439 result.set_virtual(resolved_klass, resolved_method, selected_method, vtable_index, CHECK);
1440 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1441 }
1442
1443 void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, Klass* recv_klass,
1444 const LinkInfo& link_info,
1445 bool check_null_and_abstract, TRAPS) {
1446 // throws linktime exceptions
1447 Method* resolved_method = linktime_resolve_interface_method(link_info, CHECK);
1448 methodHandle mh(THREAD, resolved_method);
1449 runtime_resolve_interface_method(result, mh, link_info.resolved_klass(),
1450 recv, recv_klass, check_null_and_abstract, CHECK);
1451 }
1452
1453 Method* LinkResolver::linktime_resolve_interface_method(const LinkInfo& link_info,
1454 TRAPS) {
1455 // normal interface method resolution
1456 Method* resolved_method = resolve_interface_method(link_info, Bytecodes::_invokeinterface, CHECK_NULL);
1457 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1458 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1459
1460 return resolved_method;
1461 }
1462
1463 // throws runtime exceptions
1464 void LinkResolver::runtime_resolve_interface_method(CallInfo& result,
1465 const methodHandle& resolved_method,
1466 Klass* resolved_klass,
1467 Handle recv,
1468 Klass* recv_klass,
1469 bool check_null_and_abstract, TRAPS) {
1470
1471 // check if receiver exists
1472 if (check_null_and_abstract && recv.is_null()) {
1473 THROW(vmSymbols::java_lang_NullPointerException());
1474 }
1475
1476 // check if receiver klass implements the resolved interface
1477 if (!recv_klass->is_subtype_of(resolved_klass)) {
1478 ResourceMark rm(THREAD);
1479 char buf[200];
1480 jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s",
1481 recv_klass->external_name(),
1482 resolved_klass->external_name());
1483 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1484 }
1485
1486 methodHandle selected_method = resolved_method;
1487
1488 // resolve the method in the receiver class, unless it is private
1489 if (!resolved_method()->is_private()) {
1490 // do lookup based on receiver klass
1491 // This search must match the linktime preparation search for itable initialization
1492 // to correctly enforce loader constraints for interface method inheritance.
1493 // Private methods are skipped as the resolved method was not private.
1494 Method* method = lookup_instance_method_in_klasses(recv_klass,
1495 resolved_method->name(),
1496 resolved_method->signature(),
1497 Klass::PrivateLookupMode::skip);
1498 selected_method = methodHandle(THREAD, method);
1499
1500 if (selected_method.is_null() && !check_null_and_abstract) {
1501 // In theory this is a harmless placeholder value, but
1502 // in practice leaving in null affects the nsk default method tests.
1503 // This needs further study.
1504 selected_method = resolved_method;
1505 }
1506 // check if method exists
1507 if (selected_method.is_null()) {
1508 // Pass arguments for generating a verbose error message.
1509 throw_abstract_method_error(resolved_method, recv_klass, CHECK);
1510 }
1511 // check access
1512 // Throw Illegal Access Error if selected_method is not public.
1513 if (!selected_method->is_public()) {
1514 ResourceMark rm(THREAD);
1515 stringStream ss;
1516 ss.print("'");
1517 Method::print_external_name(&ss, recv_klass, selected_method->name(), selected_method->signature());
1518 ss.print("'");
1519 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
1520 }
1521 // check if abstract
1522 if (check_null_and_abstract && selected_method->is_abstract()) {
1523 throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK);
1524 }
1525 }
1526
1527 if (log_develop_is_enabled(Trace, itables)) {
1528 trace_method_resolution("invokeinterface selected method: receiver-class:",
1529 recv_klass, resolved_klass, selected_method(), true);
1530 }
1531 // setup result
1532 if (resolved_method->has_vtable_index()) {
1533 int vtable_index = resolved_method->vtable_index();
1534 log_develop_trace(itables)(" -- vtable index: %d", vtable_index);
1535 assert(vtable_index == selected_method->vtable_index(), "sanity check");
1536 result.set_virtual(resolved_klass, resolved_method, selected_method, vtable_index, CHECK);
1537 } else if (resolved_method->has_itable_index()) {
1538 int itable_index = resolved_method()->itable_index();
1539 log_develop_trace(itables)(" -- itable index: %d", itable_index);
1540 result.set_interface(resolved_klass, resolved_method, selected_method, itable_index, CHECK);
1541 } else {
1542 int index = resolved_method->vtable_index();
1543 log_develop_trace(itables)(" -- non itable/vtable index: %d", index);
1544 assert(index == Method::nonvirtual_vtable_index, "Oops hit another case!");
1545 assert(resolved_method()->is_private() ||
1546 (resolved_method()->is_final() && resolved_method->method_holder() == vmClasses::Object_klass()),
1547 "Should only have non-virtual invokeinterface for private or final-Object methods!");
1548 assert(resolved_method()->can_be_statically_bound(), "Should only have non-virtual invokeinterface for statically bound methods!");
1549 // This sets up the nonvirtual form of "virtual" call (as needed for final and private methods)
1550 result.set_virtual(resolved_klass, resolved_method, resolved_method, index, CHECK);
1551 }
1552 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1553 }
1554
1555
1556 Method* LinkResolver::linktime_resolve_interface_method_or_null(
1557 const LinkInfo& link_info) {
1558 EXCEPTION_MARK;
1559 Method* method_result = linktime_resolve_interface_method(link_info, THREAD);
1560 if (HAS_PENDING_EXCEPTION) {
1561 CLEAR_PENDING_EXCEPTION;
1562 return nullptr;
1563 } else {
1564 return method_result;
1565 }
1566 }
1567
1568 Method* LinkResolver::linktime_resolve_virtual_method_or_null(
1569 const LinkInfo& link_info) {
1570 EXCEPTION_MARK;
1571 Method* method_result = linktime_resolve_virtual_method(link_info, THREAD);
1572 if (HAS_PENDING_EXCEPTION) {
1573 CLEAR_PENDING_EXCEPTION;
1574 return nullptr;
1575 } else {
1576 return method_result;
1577 }
1578 }
1579
1580 Method* LinkResolver::resolve_virtual_call_or_null(
1581 Klass* receiver_klass,
1582 const LinkInfo& link_info) {
1583 EXCEPTION_MARK;
1584 CallInfo info;
1585 resolve_virtual_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1586 if (HAS_PENDING_EXCEPTION) {
1587 CLEAR_PENDING_EXCEPTION;
1588 return nullptr;
1589 }
1590 return info.selected_method();
1591 }
1592
1593 Method* LinkResolver::resolve_interface_call_or_null(
1594 Klass* receiver_klass,
1595 const LinkInfo& link_info) {
1596 EXCEPTION_MARK;
1597 CallInfo info;
1598 resolve_interface_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1599 if (HAS_PENDING_EXCEPTION) {
1600 CLEAR_PENDING_EXCEPTION;
1601 return nullptr;
1602 }
1603 return info.selected_method();
1604 }
1605
1606 int LinkResolver::resolve_virtual_vtable_index(Klass* receiver_klass,
1607 const LinkInfo& link_info) {
1608 EXCEPTION_MARK;
1609 CallInfo info;
1610 resolve_virtual_call(info, Handle(), receiver_klass, link_info,
1611 /*check_null_or_abstract*/false, THREAD);
1612 if (HAS_PENDING_EXCEPTION) {
1613 CLEAR_PENDING_EXCEPTION;
1614 return Method::invalid_vtable_index;
1615 }
1616 return info.vtable_index();
1617 }
1618
1619 Method* LinkResolver::resolve_static_call_or_null(const LinkInfo& link_info) {
1620 EXCEPTION_MARK;
1621 CallInfo info;
1622 resolve_static_call(info, link_info, /*initialize_class*/false, THREAD);
1623 if (HAS_PENDING_EXCEPTION) {
1624 CLEAR_PENDING_EXCEPTION;
1625 return nullptr;
1626 }
1627 return info.selected_method();
1628 }
1629
1630 Method* LinkResolver::resolve_special_call_or_null(const LinkInfo& link_info) {
1631 EXCEPTION_MARK;
1632 CallInfo info;
1633 resolve_special_call(info, Handle(), link_info, THREAD);
1634 if (HAS_PENDING_EXCEPTION) {
1635 CLEAR_PENDING_EXCEPTION;
1636 return nullptr;
1637 }
1638 return info.selected_method();
1639 }
1640
1641
1642
1643 //------------------------------------------------------------------------------------------------------------------------
1644 // ConstantPool entries
1645
1646 void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) {
1647 switch (byte) {
1648 case Bytecodes::_invokestatic : resolve_invokestatic (result, pool, index, CHECK); break;
1649 case Bytecodes::_invokespecial : resolve_invokespecial (result, recv, pool, index, CHECK); break;
1650 case Bytecodes::_invokevirtual : resolve_invokevirtual (result, recv, pool, index, CHECK); break;
1651 case Bytecodes::_invokehandle : resolve_invokehandle (result, pool, index, CHECK); break;
1652 case Bytecodes::_invokedynamic : resolve_invokedynamic (result, pool, index, CHECK); break;
1653 case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break;
1654 default : break;
1655 }
1656 return;
1657 }
1658
1659 void LinkResolver::resolve_invoke(CallInfo& result, Handle& recv,
1660 const methodHandle& attached_method,
1661 Bytecodes::Code byte, TRAPS) {
1662 Klass* defc = attached_method->method_holder();
1663 Symbol* name = attached_method->name();
1664 Symbol* type = attached_method->signature();
1665 LinkInfo link_info(defc, name, type);
1666 switch(byte) {
1667 case Bytecodes::_invokevirtual:
1668 resolve_virtual_call(result, recv, recv->klass(), link_info,
1669 /*check_null_and_abstract=*/true, CHECK);
1670 break;
1671 case Bytecodes::_invokeinterface:
1672 resolve_interface_call(result, recv, recv->klass(), link_info,
1673 /*check_null_and_abstract=*/true, CHECK);
1674 break;
1675 case Bytecodes::_invokestatic:
1676 resolve_static_call(result, link_info, /*initialize_class=*/false, CHECK);
1677 break;
1678 case Bytecodes::_invokespecial:
1679 resolve_special_call(result, recv, link_info, CHECK);
1680 break;
1681 default:
1682 fatal("bad call: %s", Bytecodes::name(byte));
1683 break;
1684 }
1685 }
1686
1687 void LinkResolver::resolve_invokestatic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1688 LinkInfo link_info(pool, index, Bytecodes::_invokestatic, CHECK);
1689 resolve_static_call(result, link_info, /*initialize_class*/true, CHECK);
1690 }
1691
1692
1693 void LinkResolver::resolve_invokespecial(CallInfo& result, Handle recv,
1694 const constantPoolHandle& pool, int index, TRAPS) {
1695 LinkInfo link_info(pool, index, Bytecodes::_invokespecial, CHECK);
1696 resolve_special_call(result, recv, link_info, CHECK);
1697 }
1698
1699
1700 void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv,
1701 const constantPoolHandle& pool, int index,
1702 TRAPS) {
1703
1704 LinkInfo link_info(pool, index, Bytecodes::_invokevirtual, CHECK);
1705 Klass* recvrKlass = recv.is_null() ? (Klass*)nullptr : recv->klass();
1706 resolve_virtual_call(result, recv, recvrKlass, link_info, /*check_null_or_abstract*/true, CHECK);
1707 }
1708
1709
1710 void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, TRAPS) {
1711 LinkInfo link_info(pool, index, Bytecodes::_invokeinterface, CHECK);
1712 Klass* recvrKlass = recv.is_null() ? (Klass*)nullptr : recv->klass();
1713 resolve_interface_call(result, recv, recvrKlass, link_info, true, CHECK);
1714 }
1715
1716 bool LinkResolver::resolve_previously_linked_invokehandle(CallInfo& result, const LinkInfo& link_info, const constantPoolHandle& pool, int index, TRAPS) {
1717 ResolvedMethodEntry* method_entry = pool->cache()->resolved_method_entry_at(index);
1718 if (method_entry->method() != nullptr) {
1719 Klass* resolved_klass = link_info.resolved_klass();
1720 methodHandle method(THREAD, method_entry->method());
1721 Handle appendix(THREAD, pool->cache()->appendix_if_resolved(method_entry));
1722 result.set_handle(resolved_klass, method, appendix, CHECK_false);
1723 JFR_ONLY(Jfr::on_resolution(result, CHECK_false);)
1724 return true;
1725 } else {
1726 return false;
1727 }
1728 }
1729
1730 void LinkResolver::resolve_invokehandle(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1731 LinkInfo link_info(pool, index, Bytecodes::_invokehandle, CHECK);
1732 if (log_is_enabled(Info, methodhandles)) {
1733 ResourceMark rm(THREAD);
1734 log_info(methodhandles)("resolve_invokehandle %s %s", link_info.name()->as_C_string(),
1735 link_info.signature()->as_C_string());
1736 }
1737 { // Check if the call site has been bound already, and short circuit:
1738 bool is_done = resolve_previously_linked_invokehandle(result, link_info, pool, index, CHECK);
1739 if (is_done) return;
1740 }
1741 resolve_handle_call(result, link_info, CHECK);
1742 }
1743
1744 void LinkResolver::resolve_handle_call(CallInfo& result,
1745 const LinkInfo& link_info,
1746 TRAPS) {
1747 // JSR 292: this must be an implicitly generated method MethodHandle.invokeExact(*...) or similar
1748 Klass* resolved_klass = link_info.resolved_klass();
1749 assert(resolved_klass == vmClasses::MethodHandle_klass() ||
1750 resolved_klass == vmClasses::VarHandle_klass(), "");
1751 assert(MethodHandles::is_signature_polymorphic_name(link_info.name()), "");
1752 Handle resolved_appendix;
1753 Method* m = lookup_polymorphic_method(link_info, &resolved_appendix, CHECK);
1754 methodHandle resolved_method(THREAD, m);
1755
1756 if (link_info.check_access()) {
1757 Symbol* name = link_info.name();
1758 vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name);
1759 if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) {
1760 // Check if method can be accessed by the referring class.
1761 // MH.linkTo* invocations are not rewritten to invokehandle.
1762 assert(iid == vmIntrinsicID::_invokeBasic, "%s", vmIntrinsics::name_at(iid));
1763
1764 Klass* current_klass = link_info.current_klass();
1765 assert(current_klass != nullptr , "current_klass should not be null");
1766 check_method_accessability(current_klass,
1767 resolved_klass,
1768 resolved_method->method_holder(),
1769 resolved_method,
1770 CHECK);
1771 } else {
1772 // Java code is free to arbitrarily link signature-polymorphic invokers.
1773 assert(iid == vmIntrinsics::_invokeGeneric, "not an invoker: %s", vmIntrinsics::name_at(iid));
1774 assert(MethodHandles::is_signature_polymorphic_public_name(resolved_klass, name), "not public");
1775 }
1776 }
1777 result.set_handle(resolved_klass, resolved_method, resolved_appendix, CHECK);
1778 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1779 }
1780
1781 void LinkResolver::resolve_invokedynamic(CallInfo& result, const constantPoolHandle& pool, int indy_index, TRAPS) {
1782 int pool_index = pool->resolved_indy_entry_at(indy_index)->constant_pool_index();
1783
1784 // Resolve the bootstrap specifier (BSM + optional arguments).
1785 BootstrapInfo bootstrap_specifier(pool, pool_index, indy_index);
1786
1787 // Check if CallSite has been bound already or failed already, and short circuit:
1788 {
1789 bool is_done = bootstrap_specifier.resolve_previously_linked_invokedynamic(result, CHECK);
1790 if (is_done) return;
1791 }
1792
1793 // The initial step in Call Site Specifier Resolution is to resolve the symbolic
1794 // reference to a method handle which will be the bootstrap method for a dynamic
1795 // call site. If resolution for the java.lang.invoke.MethodHandle for the bootstrap
1796 // method fails, then a MethodHandleInError is stored at the corresponding bootstrap
1797 // method's CP index for the CONSTANT_MethodHandle_info.
1798 // Any subsequent invokedynamic instruction which shares
1799 // this bootstrap method will encounter the resolution of MethodHandleInError.
1800
1801 resolve_dynamic_call(result, bootstrap_specifier, CHECK);
1802
1803 LogTarget(Debug, methodhandles, indy) lt_indy;
1804 if (lt_indy.is_enabled()) {
1805 LogStream ls(lt_indy);
1806 bootstrap_specifier.print_msg_on(&ls, "resolve_invokedynamic");
1807 }
1808
1809 // The returned linkage result is provisional up to the moment
1810 // the interpreter or runtime performs a serialized check of
1811 // the relevant ResolvedIndyEntry::method field. This is done by the caller
1812 // of this method, via CPC::set_dynamic_call, which uses
1813 // a lock to do the final serialization of updates
1814 // to ResolvedIndyEntry state, including method.
1815
1816 // Log dynamic info to CDS classlist.
1817 ArchiveUtils::log_to_classlist(&bootstrap_specifier, CHECK);
1818 }
1819
1820 void LinkResolver::resolve_dynamic_call(CallInfo& result,
1821 BootstrapInfo& bootstrap_specifier,
1822 TRAPS) {
1823 // JSR 292: this must resolve to an implicitly generated method
1824 // such as MH.linkToCallSite(*...) or some other call-site shape.
1825 // The appendix argument is likely to be a freshly-created CallSite.
1826 // It may also be a MethodHandle from an unwrapped ConstantCallSite,
1827 // or any other reference. The resolved_method as well as the appendix
1828 // are both recorded together via CallInfo::set_handle.
1829 SystemDictionary::invoke_bootstrap_method(bootstrap_specifier, THREAD);
1830 Exceptions::wrap_dynamic_exception(/* is_indy */ true, THREAD);
1831
1832 if (HAS_PENDING_EXCEPTION) {
1833 if (!PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass())) {
1834 // Let any random low-level IE or SOE or OOME just bleed through.
1835 // Basically we pretend that the bootstrap method was never called,
1836 // if it fails this way: We neither record a successful linkage,
1837 // nor do we memorize a LE for posterity.
1838 return;
1839 }
1840 // JVMS 5.4.3 says: If an attempt by the Java Virtual Machine to resolve
1841 // a symbolic reference fails because an error is thrown that is an
1842 // instance of LinkageError (or a subclass), then subsequent attempts to
1843 // resolve the reference always fail with the same error that was thrown
1844 // as a result of the initial resolution attempt.
1845 bool recorded_res_status = bootstrap_specifier.save_and_throw_indy_exc(CHECK);
1846 if (!recorded_res_status) {
1847 // Another thread got here just before we did. So, either use the method
1848 // that it resolved or throw the LinkageError exception that it threw.
1849 bool is_done = bootstrap_specifier.resolve_previously_linked_invokedynamic(result, CHECK);
1850 if (is_done) return;
1851 }
1852 assert(bootstrap_specifier.pool()->resolved_indy_entry_at(bootstrap_specifier.indy_index())->resolution_failed(),
1853 "Resolution should have failed");
1854 }
1855
1856 bootstrap_specifier.resolve_newly_linked_invokedynamic(result, CHECK);
1857 // Exceptions::wrap_dynamic_exception not used because
1858 // set_handle doesn't throw linkage errors
1859 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1860 }
1861
1862 // Selected method is abstract.
1863 void LinkResolver::throw_abstract_method_error(const methodHandle& resolved_method,
1864 const methodHandle& selected_method,
1865 Klass *recv_klass, TRAPS) {
1866 Klass *resolved_klass = resolved_method->method_holder();
1867 ResourceMark rm(THREAD);
1868 stringStream ss;
1869
1870 if (recv_klass != nullptr) {
1871 ss.print("Receiver class %s does not define or inherit an "
1872 "implementation of the",
1873 recv_klass->external_name());
1874 } else {
1875 ss.print("Missing implementation of");
1876 }
1877
1878 assert(resolved_method.not_null(), "Sanity");
1879 ss.print(" resolved method '%s%s",
1880 resolved_method->is_abstract() ? "abstract " : "",
1881 resolved_method->is_private() ? "private " : "");
1882 resolved_method->signature()->print_as_signature_external_return_type(&ss);
1883 ss.print(" %s(", resolved_method->name()->as_C_string());
1884 resolved_method->signature()->print_as_signature_external_parameters(&ss);
1885 ss.print(")' of %s %s.",
1886 resolved_klass->external_kind(),
1887 resolved_klass->external_name());
1888
1889 if (selected_method.not_null() && !(resolved_method == selected_method)) {
1890 ss.print(" Selected method is '%s%s",
1891 selected_method->is_abstract() ? "abstract " : "",
1892 selected_method->is_private() ? "private " : "");
1893 selected_method->print_external_name(&ss);
1894 ss.print("'.");
1895 }
1896
1897 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1898 }