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::_withfield ||
965 byte == Bytecodes::_nofast_getfield || byte == Bytecodes::_nofast_putfield ||
966 (byte == Bytecodes::_nop && !link_info.check_access()), "bad field access bytecode");
967
968 bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic);
969 bool is_put = (byte == Bytecodes::_putfield || byte == Bytecodes::_putstatic ||
970 byte == Bytecodes::_nofast_putfield || byte == Bytecodes::_withfield);
971 // Check if there's a resolved klass containing the field
972 Klass* resolved_klass = link_info.resolved_klass();
973 Symbol* field = link_info.name();
974 Symbol* sig = link_info.signature();
975
976
977 if (byte == Bytecodes::_withfield && !resolved_klass->is_inline_klass()) {
978 ResourceMark rm(THREAD);
979 char msg[200];
980 jio_snprintf(msg, sizeof(msg), "Bytecode withfield cannot be used on identity class %s", resolved_klass->external_name());
981 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg);
982 }
983
984 if (is_put && !is_static && byte != Bytecodes::_withfield && resolved_klass->is_inline_klass()) {
985 ResourceMark rm(THREAD);
986 char msg[200];
987 jio_snprintf(msg, sizeof(msg), "Bytecode putfield cannot be used on primitive class %s", resolved_klass->external_name());
988 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg);
989 }
990
991 // Resolve instance field
992 Klass* sel_klass = resolved_klass->find_field(field, sig, &fd);
993 // check if field exists; i.e., if a klass containing the field def has been selected
994 if (sel_klass == nullptr) {
995 ResourceMark rm(THREAD);
996 stringStream ss;
997 ss.print("Class %s does not have member field '", resolved_klass->external_name());
998 sig->print_as_field_external_type(&ss);
999 ss.print(" %s'", field->as_C_string());
1000 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), ss.as_string());
1001 }
1002
1003 // Access checking may be turned off when calling from within the VM.
1004 Klass* current_klass = link_info.current_klass();
1005 if (link_info.check_access()) {
1006
1007 // check access
1008 check_field_accessability(current_klass, resolved_klass, sel_klass, fd, CHECK);
1009
1010 // check for errors
1011 if (is_static != fd.is_static()) {
1012 ResourceMark rm(THREAD);
1013 char msg[200];
1014 jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string());
1015 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg);
1016 }
1017
1018 // A final field can be modified only
1019 // (1) by methods declared in the class declaring the field and
1020 // (2) by the <clinit> method (in case of a static field)
1021 // or by the <init> method (in case of an instance field).
1022 // (3) by withfield when field is in a value type and the
1023 // selected class and current class are nest mates.
1024 if (is_put && fd.access_flags().is_final()) {
1025
1026 if (sel_klass != current_klass) {
1027 // If byte code is a withfield check if they are nestmates.
1028 bool are_nestmates = false;
1029 if (sel_klass->is_instance_klass() &&
1030 InstanceKlass::cast(sel_klass)->is_inline_klass() &&
1031 current_klass->is_instance_klass()) {
1032 are_nestmates = InstanceKlass::cast(current_klass)->has_nestmate_access_to(InstanceKlass::cast(sel_klass), THREAD);
1033 }
1034 if (!are_nestmates) {
1035 ResourceMark rm(THREAD);
1036 stringStream ss;
1037 ss.print("Update to %s final field %s.%s attempted from a different class (%s) than the field's declaring class",
1038 is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(),
1039 current_klass->external_name());
1040 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
1041 }
1042 }
1043
1044 if (fd.constants()->pool_holder()->major_version() >= 53) {
1045 Method* m = link_info.current_method();
1046 assert(m != nullptr, "information about the current method must be available for 'put' bytecodes");
1047 bool is_initialized_static_final_update = (byte == Bytecodes::_putstatic &&
1048 fd.is_static() &&
1049 !m->is_class_initializer());
1050 bool is_initialized_instance_final_update = ((byte == Bytecodes::_putfield || byte == Bytecodes::_nofast_putfield) &&
1051 !fd.is_static() &&
1052 !m->is_object_constructor());
1053
1054 if (is_initialized_static_final_update || is_initialized_instance_final_update) {
1055 ResourceMark rm(THREAD);
1056 stringStream ss;
1057 ss.print("Update to %s final field %s.%s attempted from a different method (%s) than the initializer method %s ",
1058 is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(),
1059 m->name()->as_C_string(),
1060 is_static ? "<clinit>" : "<init>");
1061 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
1062 }
1063 }
1064 }
1065
1066 // initialize resolved_klass if necessary
1067 // note 1: the klass which declared the field must be initialized (i.e, sel_klass)
1068 // according to the newest JVM spec (5.5, p.170) - was bug (gri 7/28/99)
1069 //
1070 // note 2: we don't want to force initialization if we are just checking
1071 // if the field access is legal; e.g., during compilation
1072 if (is_static && initialize_class) {
1073 sel_klass->initialize(CHECK);
1074 }
1075 }
1076
1077 if (link_info.check_loader_constraints() && (sel_klass != current_klass) && (current_klass != nullptr)) {
1078 check_field_loader_constraints(field, sig, current_klass, sel_klass, CHECK);
1079 }
1080
1081 // return information. note that the klass is set to the actual klass containing the
1082 // field, otherwise access of static fields in superclasses will not work.
1083 }
1084
1085
1086 //------------------------------------------------------------------------------------------------------------------------
1087 // Invoke resolution
1088 //
1089 // Naming conventions:
1090 //
1091 // resolved_method the specified method (i.e., static receiver specified via constant pool index)
1092 // sel_method the selected method (selected via run-time lookup; e.g., based on dynamic receiver class)
1093 // resolved_klass the specified klass (i.e., specified via constant pool index)
1094 // recv_klass the receiver klass
1095
1096
1097 void LinkResolver::resolve_static_call(CallInfo& result,
1098 const LinkInfo& link_info,
1099 bool initialize_class, TRAPS) {
1100 Method* resolved_method = linktime_resolve_static_method(link_info, CHECK);
1101
1102 // The resolved class can change as a result of this resolution.
1103 Klass* resolved_klass = resolved_method->method_holder();
1104
1105 // Initialize klass (this should only happen if everything is ok)
1106 if (initialize_class && resolved_klass->should_be_initialized()) {
1107 resolved_klass->initialize(CHECK);
1108 // Use updated LinkInfo to reresolve with resolved method holder
1109 LinkInfo new_info(resolved_klass, link_info.name(), link_info.signature(),
1110 link_info.current_klass(),
1111 link_info.check_access() ? LinkInfo::AccessCheck::required : LinkInfo::AccessCheck::skip,
1112 link_info.check_loader_constraints() ? LinkInfo::LoaderConstraintCheck::required : LinkInfo::LoaderConstraintCheck::skip);
1113 resolved_method = linktime_resolve_static_method(new_info, CHECK);
1114 }
1115
1116 if (resolved_method->is_continuation_native_intrinsic()
1117 && resolved_method->from_interpreted_entry() == nullptr) { // does a load_acquire
1118 methodHandle mh(THREAD, resolved_method);
1119 // Generate a compiled form of the enterSpecial intrinsic.
1120 AdapterHandlerLibrary::create_native_wrapper(mh);
1121 }
1122
1123 // setup result
1124 result.set_static(resolved_klass, methodHandle(THREAD, resolved_method), CHECK);
1125 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1126 }
1127
1128 // throws linktime exceptions
1129 Method* LinkResolver::linktime_resolve_static_method(const LinkInfo& link_info, TRAPS) {
1130
1131 Klass* resolved_klass = link_info.resolved_klass();
1132 Method* resolved_method;
1133 if (!resolved_klass->is_interface()) {
1134 resolved_method = resolve_method(link_info, Bytecodes::_invokestatic, CHECK_NULL);
1135 } else {
1136 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokestatic, CHECK_NULL);
1137 }
1138 assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier");
1139
1140 // check if static
1141 if (!resolved_method->is_static()) {
1142 ResourceMark rm(THREAD);
1143 stringStream ss;
1144 ss.print("Expected static method '");
1145 resolved_method->print_external_name(&ss);
1146 ss.print("'");
1147 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1148 }
1149 return resolved_method;
1150 }
1151
1152
1153 void LinkResolver::resolve_special_call(CallInfo& result,
1154 Handle recv,
1155 const LinkInfo& link_info,
1156 TRAPS) {
1157 Method* resolved_method = linktime_resolve_special_method(link_info, CHECK);
1158 runtime_resolve_special_method(result, link_info, methodHandle(THREAD, resolved_method), recv, CHECK);
1159 }
1160
1161 // throws linktime exceptions
1162 Method* LinkResolver::linktime_resolve_special_method(const LinkInfo& link_info, TRAPS) {
1163
1164 // Invokespecial is called for multiple special reasons:
1165 // <init>
1166 // local private method invocation, for classes and interfaces
1167 // superclass.method, which can also resolve to a default method
1168 // and the selected method is recalculated relative to the direct superclass
1169 // superinterface.method, which explicitly does not check shadowing
1170 Klass* resolved_klass = link_info.resolved_klass();
1171 Method* resolved_method = nullptr;
1172
1173 if (!resolved_klass->is_interface()) {
1174 resolved_method = resolve_method(link_info, Bytecodes::_invokespecial, CHECK_NULL);
1175 } else {
1176 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokespecial, CHECK_NULL);
1177 }
1178
1179 // check if method name is <init>, that it is found in same klass as static type
1180 // Since this method is never inherited from a super, any appearance here under
1181 // the wrong class would be an error.
1182 if (resolved_method->name() == vmSymbols::object_initializer_name() &&
1183 resolved_method->method_holder() != resolved_klass) {
1184 ResourceMark rm(THREAD);
1185 stringStream ss;
1186 ss.print("%s: method '", resolved_klass->external_name());
1187 resolved_method->signature()->print_as_signature_external_return_type(&ss);
1188 ss.print(" %s(", resolved_method->name()->as_C_string());
1189 resolved_method->signature()->print_as_signature_external_parameters(&ss);
1190 ss.print(")' not found");
1191 Exceptions::fthrow(
1192 THREAD_AND_LOCATION,
1193 vmSymbols::java_lang_NoSuchMethodError(),
1194 "%s", ss.as_string());
1195 return nullptr;
1196 }
1197
1198 // ensure that invokespecial's interface method reference is in
1199 // a direct superinterface, not an indirect superinterface
1200 Klass* current_klass = link_info.current_klass();
1201 if (current_klass != nullptr && resolved_klass->is_interface()) {
1202 InstanceKlass* klass_to_check = InstanceKlass::cast(current_klass);
1203 // Disable verification for the dynamically-generated reflection bytecodes
1204 // for serialization constructor accessor.
1205 bool is_reflect = klass_to_check->is_subclass_of(
1206 vmClasses::reflect_SerializationConstructorAccessorImpl_klass());
1207
1208 if (!is_reflect &&
1209 !klass_to_check->is_same_or_direct_interface(resolved_klass)) {
1210 ResourceMark rm(THREAD);
1211 stringStream ss;
1212 ss.print("Interface method reference: '");
1213 resolved_method->print_external_name(&ss);
1214 ss.print("', is in an indirect superinterface of %s",
1215 current_klass->external_name());
1216 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1217 }
1218 }
1219
1220 // check if not static
1221 if (resolved_method->is_static()) {
1222 ResourceMark rm(THREAD);
1223 stringStream ss;
1224 ss.print("Expecting non-static method '");
1225 resolved_method->print_external_name(&ss);
1226 ss.print("'");
1227 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1228 }
1229
1230 if (log_develop_is_enabled(Trace, itables)) {
1231 trace_method_resolution("invokespecial resolved method: caller-class:",
1232 current_klass, resolved_klass, resolved_method, true);
1233 }
1234
1235 return resolved_method;
1236 }
1237
1238 // throws runtime exceptions
1239 void LinkResolver::runtime_resolve_special_method(CallInfo& result,
1240 const LinkInfo& link_info,
1241 const methodHandle& resolved_method,
1242 Handle recv, TRAPS) {
1243
1244 Klass* resolved_klass = link_info.resolved_klass();
1245
1246 // resolved method is selected method unless we have an old-style lookup
1247 // for a superclass method
1248 // Invokespecial for a superinterface, resolved method is selected method,
1249 // no checks for shadowing
1250 methodHandle sel_method(THREAD, resolved_method());
1251
1252 if (link_info.check_access() &&
1253 // check if the method is not <init>, which is never inherited
1254 resolved_method->name() != vmSymbols::object_initializer_name()) {
1255
1256 Klass* current_klass = link_info.current_klass();
1257
1258 // Check if the class of the resolved_klass is a superclass
1259 // (not supertype in order to exclude interface classes) of the current class.
1260 // This check is not performed for super.invoke for interface methods
1261 // in super interfaces.
1262 if (current_klass->is_subclass_of(resolved_klass) &&
1263 current_klass != resolved_klass) {
1264 // Lookup super method
1265 Klass* super_klass = current_klass->super();
1266 Method* instance_method = lookup_instance_method_in_klasses(super_klass,
1267 resolved_method->name(),
1268 resolved_method->signature(),
1269 Klass::PrivateLookupMode::find);
1270 sel_method = methodHandle(THREAD, instance_method);
1271
1272 // check if found
1273 if (sel_method.is_null()) {
1274 ResourceMark rm(THREAD);
1275 stringStream ss;
1276 ss.print("'");
1277 resolved_method->print_external_name(&ss);
1278 ss.print("'");
1279 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1280 // check loader constraints if found a different method
1281 } else if (link_info.check_loader_constraints() && sel_method() != resolved_method()) {
1282 check_method_loader_constraints(link_info, sel_method, "method", CHECK);
1283 }
1284 }
1285
1286 // Check that the class of objectref (the receiver) is the current class or interface,
1287 // or a subtype of the current class or interface (the sender), otherwise invokespecial
1288 // throws IllegalAccessError.
1289 // The verifier checks that the sender is a subtype of the class in the I/MR operand.
1290 // The verifier also checks that the receiver is a subtype of the sender, if the sender is
1291 // a class. If the sender is an interface, the check has to be performed at runtime.
1292 InstanceKlass* sender = InstanceKlass::cast(current_klass);
1293 if (sender->is_interface() && recv.not_null()) {
1294 Klass* receiver_klass = recv->klass();
1295 if (!receiver_klass->is_subtype_of(sender)) {
1296 ResourceMark rm(THREAD);
1297 char buf[500];
1298 jio_snprintf(buf, sizeof(buf),
1299 "Receiver class %s must be the current class or a subtype of interface %s",
1300 receiver_klass->external_name(),
1301 sender->external_name());
1302 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), buf);
1303 }
1304 }
1305 }
1306
1307 // check if not static
1308 if (sel_method->is_static()) {
1309 ResourceMark rm(THREAD);
1310 stringStream ss;
1311 ss.print("Expecting non-static method '");
1312 resolved_method->print_external_name(&ss);
1313 ss.print("'");
1314 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1315 }
1316
1317 // check if abstract
1318 if (sel_method->is_abstract()) {
1319 ResourceMark rm(THREAD);
1320 stringStream ss;
1321 ss.print("'");
1322 Method::print_external_name(&ss, resolved_klass, sel_method->name(), sel_method->signature());
1323 ss.print("'");
1324 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1325 }
1326
1327 if (log_develop_is_enabled(Trace, itables)) {
1328 trace_method_resolution("invokespecial selected method: resolved-class:",
1329 resolved_klass, resolved_klass, sel_method(), true);
1330 }
1331
1332 // setup result
1333 result.set_static(resolved_klass, sel_method, CHECK);
1334 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1335 }
1336
1337 void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, Klass* receiver_klass,
1338 const LinkInfo& link_info,
1339 bool check_null_and_abstract, TRAPS) {
1340 Method* resolved_method = linktime_resolve_virtual_method(link_info, CHECK);
1341 runtime_resolve_virtual_method(result, methodHandle(THREAD, resolved_method),
1342 link_info.resolved_klass(),
1343 recv, receiver_klass,
1344 check_null_and_abstract, CHECK);
1345 }
1346
1347 // throws linktime exceptions
1348 Method* LinkResolver::linktime_resolve_virtual_method(const LinkInfo& link_info,
1349 TRAPS) {
1350 // normal method resolution
1351 Method* resolved_method = resolve_method(link_info, Bytecodes::_invokevirtual, CHECK_NULL);
1352
1353 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1354 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1355
1356 // check if private interface method
1357 Klass* resolved_klass = link_info.resolved_klass();
1358 Klass* current_klass = link_info.current_klass();
1359
1360 // This is impossible, if resolve_klass is an interface, we've thrown icce in resolve_method
1361 if (resolved_klass->is_interface() && resolved_method->is_private()) {
1362 ResourceMark rm(THREAD);
1363 stringStream ss;
1364 ss.print("private interface method requires invokespecial, not invokevirtual: method '");
1365 resolved_method->print_external_name(&ss);
1366 ss.print("', caller-class: %s",
1367 (current_klass == nullptr ? "<null>" : current_klass->internal_name()));
1368 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1369 }
1370
1371 // check if not static
1372 if (resolved_method->is_static()) {
1373 ResourceMark rm(THREAD);
1374 stringStream ss;
1375 ss.print("Expecting non-static method '");
1376 resolved_method->print_external_name(&ss);
1377 ss.print("'");
1378 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1379 }
1380
1381 if (log_develop_is_enabled(Trace, vtables)) {
1382 trace_method_resolution("invokevirtual resolved method: caller-class:",
1383 current_klass, resolved_klass, resolved_method, false);
1384 }
1385
1386 return resolved_method;
1387 }
1388
1389 // throws runtime exceptions
1390 void LinkResolver::runtime_resolve_virtual_method(CallInfo& result,
1391 const methodHandle& resolved_method,
1392 Klass* resolved_klass,
1393 Handle recv,
1394 Klass* recv_klass,
1395 bool check_null_and_abstract,
1396 TRAPS) {
1397
1398 // setup default return values
1399 int vtable_index = Method::invalid_vtable_index;
1400 methodHandle selected_method;
1401
1402 // runtime method resolution
1403 if (check_null_and_abstract && recv.is_null()) { // check if receiver exists
1404 THROW(vmSymbols::java_lang_NullPointerException());
1405 }
1406
1407 // Virtual methods cannot be resolved before its klass has been linked, for otherwise the Method*'s
1408 // has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since
1409 // a missing receiver might result in a bogus lookup.
1410 assert(resolved_method->method_holder()->is_linked(), "must be linked");
1411
1412 // do lookup based on receiver klass using the vtable index
1413 if (resolved_method->method_holder()->is_interface()) { // default or miranda method
1414 vtable_index = vtable_index_of_interface_method(resolved_klass, resolved_method);
1415 assert(vtable_index >= 0 , "we should have valid vtable index at this point");
1416
1417 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1418 } else {
1419 // at this point we are sure that resolved_method is virtual and not
1420 // a default or miranda method; therefore, it must have a valid vtable index.
1421 assert(!resolved_method->has_itable_index(), "");
1422 vtable_index = resolved_method->vtable_index();
1423 // We could get a negative vtable_index of nonvirtual_vtable_index for private
1424 // methods, or for final methods. Private methods never appear in the vtable
1425 // and never override other methods. As an optimization, final methods are
1426 // never put in the vtable, unless they override an existing method.
1427 // So if we do get nonvirtual_vtable_index, it means the selected method is the
1428 // resolved method, and it can never be changed by an override.
1429 if (vtable_index == Method::nonvirtual_vtable_index) {
1430 assert(resolved_method->can_be_statically_bound(), "cannot override this method");
1431 selected_method = resolved_method;
1432 } else {
1433 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1434 }
1435 }
1436
1437 // check if method exists
1438 if (selected_method.is_null()) {
1439 throw_abstract_method_error(resolved_method, recv_klass, CHECK);
1440 }
1441
1442 // check if abstract
1443 if (check_null_and_abstract && selected_method->is_abstract()) {
1444 // Pass arguments for generating a verbose error message.
1445 throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK);
1446 }
1447
1448 if (log_develop_is_enabled(Trace, vtables)) {
1449 trace_method_resolution("invokevirtual selected method: receiver-class:",
1450 recv_klass, resolved_klass, selected_method(),
1451 false, vtable_index);
1452 }
1453 // setup result
1454 result.set_virtual(resolved_klass, resolved_method, selected_method, vtable_index, CHECK);
1455 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1456 }
1457
1458 void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, Klass* recv_klass,
1459 const LinkInfo& link_info,
1460 bool check_null_and_abstract, TRAPS) {
1461 // throws linktime exceptions
1462 Method* resolved_method = linktime_resolve_interface_method(link_info, CHECK);
1463 methodHandle mh(THREAD, resolved_method);
1464 runtime_resolve_interface_method(result, mh, link_info.resolved_klass(),
1465 recv, recv_klass, check_null_and_abstract, CHECK);
1466 }
1467
1468 Method* LinkResolver::linktime_resolve_interface_method(const LinkInfo& link_info,
1469 TRAPS) {
1470 // normal interface method resolution
1471 Method* resolved_method = resolve_interface_method(link_info, Bytecodes::_invokeinterface, CHECK_NULL);
1472 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1473 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1474
1475 return resolved_method;
1476 }
1477
1478 // throws runtime exceptions
1479 void LinkResolver::runtime_resolve_interface_method(CallInfo& result,
1480 const methodHandle& resolved_method,
1481 Klass* resolved_klass,
1482 Handle recv,
1483 Klass* recv_klass,
1484 bool check_null_and_abstract, TRAPS) {
1485
1486 // check if receiver exists
1487 if (check_null_and_abstract && recv.is_null()) {
1488 THROW(vmSymbols::java_lang_NullPointerException());
1489 }
1490
1491 // check if receiver klass implements the resolved interface
1492 if (!recv_klass->is_subtype_of(resolved_klass)) {
1493 ResourceMark rm(THREAD);
1494 char buf[200];
1495 jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s",
1496 recv_klass->external_name(),
1497 resolved_klass->external_name());
1498 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1499 }
1500
1501 methodHandle selected_method = resolved_method;
1502
1503 // resolve the method in the receiver class, unless it is private
1504 if (!resolved_method()->is_private()) {
1505 // do lookup based on receiver klass
1506 // This search must match the linktime preparation search for itable initialization
1507 // to correctly enforce loader constraints for interface method inheritance.
1508 // Private methods are skipped as the resolved method was not private.
1509 Method* method = lookup_instance_method_in_klasses(recv_klass,
1510 resolved_method->name(),
1511 resolved_method->signature(),
1512 Klass::PrivateLookupMode::skip);
1513 selected_method = methodHandle(THREAD, method);
1514
1515 if (selected_method.is_null() && !check_null_and_abstract) {
1516 // In theory this is a harmless placeholder value, but
1517 // in practice leaving in null affects the nsk default method tests.
1518 // This needs further study.
1519 selected_method = resolved_method;
1520 }
1521 // check if method exists
1522 if (selected_method.is_null()) {
1523 // Pass arguments for generating a verbose error message.
1524 throw_abstract_method_error(resolved_method, recv_klass, CHECK);
1525 }
1526 // check access
1527 // Throw Illegal Access Error if selected_method is not public.
1528 if (!selected_method->is_public()) {
1529 ResourceMark rm(THREAD);
1530 stringStream ss;
1531 ss.print("'");
1532 Method::print_external_name(&ss, recv_klass, selected_method->name(), selected_method->signature());
1533 ss.print("'");
1534 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
1535 }
1536 // check if abstract
1537 if (check_null_and_abstract && selected_method->is_abstract()) {
1538 throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK);
1539 }
1540 }
1541
1542 if (log_develop_is_enabled(Trace, itables)) {
1543 trace_method_resolution("invokeinterface selected method: receiver-class:",
1544 recv_klass, resolved_klass, selected_method(), true);
1545 }
1546 // setup result
1547 if (resolved_method->has_vtable_index()) {
1548 int vtable_index = resolved_method->vtable_index();
1549 log_develop_trace(itables)(" -- vtable index: %d", vtable_index);
1550 assert(vtable_index == selected_method->vtable_index(), "sanity check");
1551 result.set_virtual(resolved_klass, resolved_method, selected_method, vtable_index, CHECK);
1552 } else if (resolved_method->has_itable_index()) {
1553 int itable_index = resolved_method()->itable_index();
1554 log_develop_trace(itables)(" -- itable index: %d", itable_index);
1555 result.set_interface(resolved_klass, resolved_method, selected_method, itable_index, CHECK);
1556 } else {
1557 int index = resolved_method->vtable_index();
1558 log_develop_trace(itables)(" -- non itable/vtable index: %d", index);
1559 assert(index == Method::nonvirtual_vtable_index, "Oops hit another case!");
1560 assert(resolved_method()->is_private() ||
1561 (resolved_method()->is_final() && resolved_method->method_holder() == vmClasses::Object_klass()),
1562 "Should only have non-virtual invokeinterface for private or final-Object methods!");
1563 assert(resolved_method()->can_be_statically_bound(), "Should only have non-virtual invokeinterface for statically bound methods!");
1564 // This sets up the nonvirtual form of "virtual" call (as needed for final and private methods)
1565 result.set_virtual(resolved_klass, resolved_method, resolved_method, index, CHECK);
1566 }
1567 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1568 }
1569
1570
1571 Method* LinkResolver::linktime_resolve_interface_method_or_null(
1572 const LinkInfo& link_info) {
1573 EXCEPTION_MARK;
1574 Method* method_result = linktime_resolve_interface_method(link_info, THREAD);
1575 if (HAS_PENDING_EXCEPTION) {
1576 CLEAR_PENDING_EXCEPTION;
1577 return nullptr;
1578 } else {
1579 return method_result;
1580 }
1581 }
1582
1583 Method* LinkResolver::linktime_resolve_virtual_method_or_null(
1584 const LinkInfo& link_info) {
1585 EXCEPTION_MARK;
1586 Method* method_result = linktime_resolve_virtual_method(link_info, THREAD);
1587 if (HAS_PENDING_EXCEPTION) {
1588 CLEAR_PENDING_EXCEPTION;
1589 return nullptr;
1590 } else {
1591 return method_result;
1592 }
1593 }
1594
1595 Method* LinkResolver::resolve_virtual_call_or_null(
1596 Klass* receiver_klass,
1597 const LinkInfo& link_info) {
1598 EXCEPTION_MARK;
1599 CallInfo info;
1600 resolve_virtual_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1601 if (HAS_PENDING_EXCEPTION) {
1602 CLEAR_PENDING_EXCEPTION;
1603 return nullptr;
1604 }
1605 return info.selected_method();
1606 }
1607
1608 Method* LinkResolver::resolve_interface_call_or_null(
1609 Klass* receiver_klass,
1610 const LinkInfo& link_info) {
1611 EXCEPTION_MARK;
1612 CallInfo info;
1613 resolve_interface_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1614 if (HAS_PENDING_EXCEPTION) {
1615 CLEAR_PENDING_EXCEPTION;
1616 return nullptr;
1617 }
1618 return info.selected_method();
1619 }
1620
1621 int LinkResolver::resolve_virtual_vtable_index(Klass* receiver_klass,
1622 const LinkInfo& link_info) {
1623 EXCEPTION_MARK;
1624 CallInfo info;
1625 resolve_virtual_call(info, Handle(), receiver_klass, link_info,
1626 /*check_null_or_abstract*/false, THREAD);
1627 if (HAS_PENDING_EXCEPTION) {
1628 CLEAR_PENDING_EXCEPTION;
1629 return Method::invalid_vtable_index;
1630 }
1631 return info.vtable_index();
1632 }
1633
1634 Method* LinkResolver::resolve_static_call_or_null(const LinkInfo& link_info) {
1635 EXCEPTION_MARK;
1636 CallInfo info;
1637 resolve_static_call(info, link_info, /*initialize_class*/false, THREAD);
1638 if (HAS_PENDING_EXCEPTION) {
1639 CLEAR_PENDING_EXCEPTION;
1640 return nullptr;
1641 }
1642 return info.selected_method();
1643 }
1644
1645 Method* LinkResolver::resolve_special_call_or_null(const LinkInfo& link_info) {
1646 EXCEPTION_MARK;
1647 CallInfo info;
1648 resolve_special_call(info, Handle(), link_info, THREAD);
1649 if (HAS_PENDING_EXCEPTION) {
1650 CLEAR_PENDING_EXCEPTION;
1651 return nullptr;
1652 }
1653 return info.selected_method();
1654 }
1655
1656
1657
1658 //------------------------------------------------------------------------------------------------------------------------
1659 // ConstantPool entries
1660
1661 void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) {
1662 switch (byte) {
1663 case Bytecodes::_invokestatic : resolve_invokestatic (result, pool, index, CHECK); break;
1664 case Bytecodes::_invokespecial : resolve_invokespecial (result, recv, pool, index, CHECK); break;
1665 case Bytecodes::_invokevirtual : resolve_invokevirtual (result, recv, pool, index, CHECK); break;
1666 case Bytecodes::_invokehandle : resolve_invokehandle (result, pool, index, CHECK); break;
1667 case Bytecodes::_invokedynamic : resolve_invokedynamic (result, pool, index, CHECK); break;
1668 case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break;
1669 default : break;
1670 }
1671 return;
1672 }
1673
1674 void LinkResolver::resolve_invoke(CallInfo& result, Handle& recv,
1675 const methodHandle& attached_method,
1676 Bytecodes::Code byte, bool check_null_and_abstract, TRAPS) {
1677 Klass* defc = attached_method->method_holder();
1678 Symbol* name = attached_method->name();
1679 Symbol* type = attached_method->signature();
1680 LinkInfo link_info(defc, name, type);
1681 Klass* recv_klass = recv.is_null() ? defc : recv->klass();
1682 switch(byte) {
1683 case Bytecodes::_invokevirtual:
1684 resolve_virtual_call(result, recv, recv_klass, link_info,
1685 check_null_and_abstract, CHECK);
1686 break;
1687 case Bytecodes::_invokeinterface:
1688 resolve_interface_call(result, recv, recv_klass, link_info,
1689 check_null_and_abstract, CHECK);
1690 break;
1691 case Bytecodes::_invokestatic:
1692 resolve_static_call(result, link_info, /*initialize_class=*/false, CHECK);
1693 break;
1694 case Bytecodes::_invokespecial:
1695 resolve_special_call(result, recv, link_info, CHECK);
1696 break;
1697 default:
1698 fatal("bad call: %s", Bytecodes::name(byte));
1699 break;
1700 }
1701 }
1702
1703 void LinkResolver::resolve_invokestatic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1704 LinkInfo link_info(pool, index, Bytecodes::_invokestatic, CHECK);
1705 resolve_static_call(result, link_info, /*initialize_class*/true, CHECK);
1706 }
1707
1708
1709 void LinkResolver::resolve_invokespecial(CallInfo& result, Handle recv,
1710 const constantPoolHandle& pool, int index, TRAPS) {
1711 LinkInfo link_info(pool, index, Bytecodes::_invokespecial, CHECK);
1712 resolve_special_call(result, recv, link_info, CHECK);
1713 }
1714
1715
1716 void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv,
1717 const constantPoolHandle& pool, int index,
1718 TRAPS) {
1719
1720 LinkInfo link_info(pool, index, Bytecodes::_invokevirtual, CHECK);
1721 Klass* recvrKlass = recv.is_null() ? (Klass*)nullptr : recv->klass();
1722 resolve_virtual_call(result, recv, recvrKlass, link_info, /*check_null_or_abstract*/true, CHECK);
1723 }
1724
1725
1726 void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, TRAPS) {
1727 LinkInfo link_info(pool, index, Bytecodes::_invokeinterface, CHECK);
1728 Klass* recvrKlass = recv.is_null() ? (Klass*)nullptr : recv->klass();
1729 resolve_interface_call(result, recv, recvrKlass, link_info, true, CHECK);
1730 }
1731
1732 bool LinkResolver::resolve_previously_linked_invokehandle(CallInfo& result, const LinkInfo& link_info, const constantPoolHandle& pool, int index, TRAPS) {
1733 int cache_index = ConstantPool::decode_cpcache_index(index, true);
1734 ConstantPoolCacheEntry* cpce = pool->cache()->entry_at(cache_index);
1735 if (!cpce->is_f1_null()) {
1736 Klass* resolved_klass = link_info.resolved_klass();
1737 methodHandle method(THREAD, cpce->f1_as_method());
1738 Handle appendix(THREAD, cpce->appendix_if_resolved(pool));
1739 result.set_handle(resolved_klass, method, appendix, CHECK_false);
1740 JFR_ONLY(Jfr::on_resolution(result, CHECK_false);)
1741 return true;
1742 } else {
1743 return false;
1744 }
1745 }
1746
1747 void LinkResolver::resolve_invokehandle(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1748 LinkInfo link_info(pool, index, Bytecodes::_invokehandle, CHECK);
1749 if (log_is_enabled(Info, methodhandles)) {
1750 ResourceMark rm(THREAD);
1751 log_info(methodhandles)("resolve_invokehandle %s %s", link_info.name()->as_C_string(),
1752 link_info.signature()->as_C_string());
1753 }
1754 { // Check if the call site has been bound already, and short circuit:
1755 bool is_done = resolve_previously_linked_invokehandle(result, link_info, pool, index, CHECK);
1756 if (is_done) return;
1757 }
1758 resolve_handle_call(result, link_info, CHECK);
1759 }
1760
1761 void LinkResolver::resolve_handle_call(CallInfo& result,
1762 const LinkInfo& link_info,
1763 TRAPS) {
1764 // JSR 292: this must be an implicitly generated method MethodHandle.invokeExact(*...) or similar
1765 Klass* resolved_klass = link_info.resolved_klass();
1766 assert(resolved_klass == vmClasses::MethodHandle_klass() ||
1767 resolved_klass == vmClasses::VarHandle_klass(), "");
1768 assert(MethodHandles::is_signature_polymorphic_name(link_info.name()), "");
1769 Handle resolved_appendix;
1770 Method* m = lookup_polymorphic_method(link_info, &resolved_appendix, CHECK);
1771 methodHandle resolved_method(THREAD, m);
1772
1773 if (link_info.check_access()) {
1774 Symbol* name = link_info.name();
1775 vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name);
1776 if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) {
1777 // Check if method can be accessed by the referring class.
1778 // MH.linkTo* invocations are not rewritten to invokehandle.
1779 assert(iid == vmIntrinsicID::_invokeBasic, "%s", vmIntrinsics::name_at(iid));
1780
1781 Klass* current_klass = link_info.current_klass();
1782 assert(current_klass != nullptr , "current_klass should not be null");
1783 check_method_accessability(current_klass,
1784 resolved_klass,
1785 resolved_method->method_holder(),
1786 resolved_method,
1787 CHECK);
1788 } else {
1789 // Java code is free to arbitrarily link signature-polymorphic invokers.
1790 assert(iid == vmIntrinsics::_invokeGeneric, "not an invoker: %s", vmIntrinsics::name_at(iid));
1791 assert(MethodHandles::is_signature_polymorphic_public_name(resolved_klass, name), "not public");
1792 }
1793 }
1794 result.set_handle(resolved_klass, resolved_method, resolved_appendix, CHECK);
1795 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1796 }
1797
1798 void LinkResolver::resolve_invokedynamic(CallInfo& result, const constantPoolHandle& pool, int indy_index, TRAPS) {
1799 int index = pool->decode_invokedynamic_index(indy_index);
1800 int pool_index = pool->resolved_indy_entry_at(index)->constant_pool_index();
1801
1802 // Resolve the bootstrap specifier (BSM + optional arguments).
1803 BootstrapInfo bootstrap_specifier(pool, pool_index, index);
1804
1805 // Check if CallSite has been bound already or failed already, and short circuit:
1806 {
1807 bool is_done = bootstrap_specifier.resolve_previously_linked_invokedynamic(result, CHECK);
1808 if (is_done) return;
1809 }
1810
1811 // The initial step in Call Site Specifier Resolution is to resolve the symbolic
1812 // reference to a method handle which will be the bootstrap method for a dynamic
1813 // call site. If resolution for the java.lang.invoke.MethodHandle for the bootstrap
1814 // method fails, then a MethodHandleInError is stored at the corresponding bootstrap
1815 // method's CP index for the CONSTANT_MethodHandle_info.
1816 // Any subsequent invokedynamic instruction which shares
1817 // this bootstrap method will encounter the resolution of MethodHandleInError.
1818
1819 resolve_dynamic_call(result, bootstrap_specifier, CHECK);
1820
1821 LogTarget(Debug, methodhandles, indy) lt_indy;
1822 if (lt_indy.is_enabled()) {
1823 LogStream ls(lt_indy);
1824 bootstrap_specifier.print_msg_on(&ls, "resolve_invokedynamic");
1825 }
1826
1827 // The returned linkage result is provisional up to the moment
1828 // the interpreter or runtime performs a serialized check of
1829 // the relevant ResolvedIndyEntry::method field. This is done by the caller
1830 // of this method, via CPC::set_dynamic_call, which uses
1831 // a lock to do the final serialization of updates
1832 // to ResolvedIndyEntry state, including method.
1833
1834 // Log dynamic info to CDS classlist.
1835 ArchiveUtils::log_to_classlist(&bootstrap_specifier, CHECK);
1836 }
1837
1838 void LinkResolver::resolve_dynamic_call(CallInfo& result,
1839 BootstrapInfo& bootstrap_specifier,
1840 TRAPS) {
1841 // JSR 292: this must resolve to an implicitly generated method
1842 // such as MH.linkToCallSite(*...) or some other call-site shape.
1843 // The appendix argument is likely to be a freshly-created CallSite.
1844 // It may also be a MethodHandle from an unwrapped ConstantCallSite,
1845 // or any other reference. The resolved_method as well as the appendix
1846 // are both recorded together via CallInfo::set_handle.
1847 SystemDictionary::invoke_bootstrap_method(bootstrap_specifier, THREAD);
1848 Exceptions::wrap_dynamic_exception(/* is_indy */ true, THREAD);
1849
1850 if (HAS_PENDING_EXCEPTION) {
1851 if (!PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass())) {
1852 // Let any random low-level IE or SOE or OOME just bleed through.
1853 // Basically we pretend that the bootstrap method was never called,
1854 // if it fails this way: We neither record a successful linkage,
1855 // nor do we memorize a LE for posterity.
1856 return;
1857 }
1858 // JVMS 5.4.3 says: If an attempt by the Java Virtual Machine to resolve
1859 // a symbolic reference fails because an error is thrown that is an
1860 // instance of LinkageError (or a subclass), then subsequent attempts to
1861 // resolve the reference always fail with the same error that was thrown
1862 // as a result of the initial resolution attempt.
1863 bool recorded_res_status = bootstrap_specifier.save_and_throw_indy_exc(CHECK);
1864 if (!recorded_res_status) {
1865 // Another thread got here just before we did. So, either use the method
1866 // that it resolved or throw the LinkageError exception that it threw.
1867 bool is_done = bootstrap_specifier.resolve_previously_linked_invokedynamic(result, CHECK);
1868 if (is_done) return;
1869 }
1870 assert(bootstrap_specifier.pool()->resolved_indy_entry_at(bootstrap_specifier.indy_index())->resolution_failed(),
1871 "Resolution should have failed");
1872 }
1873
1874 bootstrap_specifier.resolve_newly_linked_invokedynamic(result, CHECK);
1875 // Exceptions::wrap_dynamic_exception not used because
1876 // set_handle doesn't throw linkage errors
1877 JFR_ONLY(Jfr::on_resolution(result, CHECK);)
1878 }
1879
1880 // Selected method is abstract.
1881 void LinkResolver::throw_abstract_method_error(const methodHandle& resolved_method,
1882 const methodHandle& selected_method,
1883 Klass *recv_klass, TRAPS) {
1884 Klass *resolved_klass = resolved_method->method_holder();
1885 ResourceMark rm(THREAD);
1886 stringStream ss;
1887
1888 if (recv_klass != nullptr) {
1889 ss.print("Receiver class %s does not define or inherit an "
1890 "implementation of the",
1891 recv_klass->external_name());
1892 } else {
1893 ss.print("Missing implementation of");
1894 }
1895
1896 assert(resolved_method.not_null(), "Sanity");
1897 ss.print(" resolved method '%s%s",
1898 resolved_method->is_abstract() ? "abstract " : "",
1899 resolved_method->is_private() ? "private " : "");
1900 resolved_method->signature()->print_as_signature_external_return_type(&ss);
1901 ss.print(" %s(", resolved_method->name()->as_C_string());
1902 resolved_method->signature()->print_as_signature_external_parameters(&ss);
1903 ss.print(")' of %s %s.",
1904 resolved_klass->external_kind(),
1905 resolved_klass->external_name());
1906
1907 if (selected_method.not_null() && !(resolved_method == selected_method)) {
1908 ss.print(" Selected method is '%s%s",
1909 selected_method->is_abstract() ? "abstract " : "",
1910 selected_method->is_private() ? "private " : "");
1911 selected_method->print_external_name(&ss);
1912 ss.print("'.");
1913 }
1914
1915 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1916 }