1 /*
2 * Copyright (c) 1997, 2020, 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 "jvm.h"
27 #include "classfile/defaultMethods.hpp"
28 #include "classfile/javaClasses.hpp"
29 #include "classfile/resolutionErrors.hpp"
30 #include "classfile/symbolTable.hpp"
31 #include "classfile/systemDictionary.hpp"
32 #include "classfile/vmSymbols.hpp"
33 #include "compiler/compilationPolicy.hpp"
34 #include "compiler/compileBroker.hpp"
35 #include "gc/shared/collectedHeap.inline.hpp"
36 #include "interpreter/bootstrapInfo.hpp"
37 #include "interpreter/bytecode.hpp"
38 #include "interpreter/interpreterRuntime.hpp"
39 #include "interpreter/linkResolver.hpp"
40 #include "logging/log.hpp"
41 #include "logging/logStream.hpp"
42 #include "memory/resourceArea.hpp"
43 #include "oops/constantPool.hpp"
44 #include "oops/cpCache.inline.hpp"
45 #include "oops/instanceKlass.hpp"
46 #include "oops/method.hpp"
47 #include "oops/objArrayKlass.hpp"
48 #include "oops/objArrayOop.hpp"
49 #include "oops/oop.inline.hpp"
50 #include "prims/methodHandles.hpp"
51 #include "prims/nativeLookup.hpp"
52 #include "runtime/fieldDescriptor.inline.hpp"
53 #include "runtime/frame.inline.hpp"
54 #include "runtime/handles.inline.hpp"
55 #include "runtime/reflection.hpp"
56 #include "runtime/safepointVerifiers.hpp"
57 #include "runtime/signature.hpp"
58 #include "runtime/thread.inline.hpp"
59 #include "runtime/vmThread.hpp"
60
61 //------------------------------------------------------------------------------------------------------------------------
62 // Implementation of CallInfo
63
64
65 void CallInfo::set_static(Klass* resolved_klass, const methodHandle& resolved_method, TRAPS) {
66 int vtable_index = Method::nonvirtual_vtable_index;
67 set_common(resolved_klass, resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK);
68 }
69
70
71 void CallInfo::set_interface(Klass* resolved_klass,
72 Klass* selected_klass,
73 const methodHandle& resolved_method,
74 const methodHandle& selected_method,
75 int itable_index, TRAPS) {
76 // This is only called for interface methods. If the resolved_method
77 // comes from java/lang/Object, it can be the subject of a virtual call, so
78 // we should pick the vtable index from the resolved method.
79 // In that case, the caller must call set_virtual instead of set_interface.
80 assert(resolved_method->method_holder()->is_interface(), "");
81 assert(itable_index == resolved_method()->itable_index(), "");
82 set_common(resolved_klass, selected_klass, resolved_method, selected_method, CallInfo::itable_call, itable_index, CHECK);
83 }
84
85 void CallInfo::set_virtual(Klass* resolved_klass,
86 Klass* selected_klass,
87 const methodHandle& resolved_method,
88 const methodHandle& selected_method,
89 int vtable_index, TRAPS) {
90 assert(vtable_index >= 0 || vtable_index == Method::nonvirtual_vtable_index, "valid index");
91 assert(vtable_index < 0 || !resolved_method->has_vtable_index() || vtable_index == resolved_method->vtable_index(), "");
92 CallKind kind = (vtable_index >= 0 && !resolved_method->can_be_statically_bound() ? CallInfo::vtable_call : CallInfo::direct_call);
93 set_common(resolved_klass, selected_klass, resolved_method, selected_method, kind, vtable_index, CHECK);
94 assert(!resolved_method->is_compiled_lambda_form(), "these must be handled via an invokehandle call");
95 }
96
97 void CallInfo::set_handle(const methodHandle& resolved_method,
98 Handle resolved_appendix, TRAPS) {
99 set_handle(SystemDictionary::MethodHandle_klass(), resolved_method, resolved_appendix, CHECK);
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_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 Klass* selected_klass,
117 const methodHandle& resolved_method,
118 const methodHandle& selected_method,
119 CallKind kind,
120 int index,
121 TRAPS) {
122 assert(resolved_method->signature() == selected_method->signature(), "signatures must correspond");
123 _resolved_klass = resolved_klass;
124 _selected_klass = selected_klass;
125 _resolved_method = resolved_method;
126 _selected_method = selected_method;
127 _call_kind = kind;
128 _call_index = index;
129 _resolved_appendix = Handle();
130 DEBUG_ONLY(verify()); // verify before making side effects
131
132 CompilationPolicy::compile_if_required(selected_method, THREAD);
133 }
134
135 // utility query for unreflecting a method
136 CallInfo::CallInfo(Method* resolved_method, Klass* resolved_klass, TRAPS) {
137 Klass* resolved_method_holder = resolved_method->method_holder();
138 if (resolved_klass == NULL) { // 2nd argument defaults to holder of 1st
139 resolved_klass = resolved_method_holder;
140 }
141 _resolved_klass = resolved_klass;
142 _selected_klass = resolved_klass;
143 _resolved_method = methodHandle(THREAD, resolved_method);
144 _selected_method = methodHandle(THREAD, resolved_method);
145 // classify:
146 CallKind kind = CallInfo::unknown_kind;
147 int index = resolved_method->vtable_index();
148 if (resolved_method->can_be_statically_bound()) {
149 kind = CallInfo::direct_call;
150 } else if (!resolved_method_holder->is_interface()) {
151 // Could be an Object method inherited into an interface, but still a vtable call.
152 kind = CallInfo::vtable_call;
153 } else if (!resolved_klass->is_interface()) {
154 // A default or miranda method. Compute the vtable index.
155 index = LinkResolver::vtable_index_of_interface_method(resolved_klass,
156 _resolved_method);
157 assert(index >= 0 , "we should have valid vtable index at this point");
158
159 kind = CallInfo::vtable_call;
160 } else if (resolved_method->has_vtable_index()) {
161 // Can occur if an interface redeclares a method of Object.
162
163 #ifdef ASSERT
164 // Ensure that this is really the case.
165 Klass* object_klass = SystemDictionary::Object_klass();
166 Method * object_resolved_method = object_klass->vtable().method_at(index);
167 assert(object_resolved_method->name() == resolved_method->name(),
168 "Object and interface method names should match at vtable index %d, %s != %s",
169 index, object_resolved_method->name()->as_C_string(), resolved_method->name()->as_C_string());
170 assert(object_resolved_method->signature() == resolved_method->signature(),
171 "Object and interface method signatures should match at vtable index %d, %s != %s",
172 index, object_resolved_method->signature()->as_C_string(), resolved_method->signature()->as_C_string());
173 #endif // ASSERT
174
175 kind = CallInfo::vtable_call;
176 } else {
177 // A regular interface call.
178 kind = CallInfo::itable_call;
179 index = resolved_method->itable_index();
180 }
181 assert(index == Method::nonvirtual_vtable_index || index >= 0, "bad index %d", index);
182 _call_kind = kind;
183 _call_index = index;
184 _resolved_appendix = Handle();
185 // Find or create a ResolvedMethod instance for this Method*
186 set_resolved_method_name(CHECK);
187
188 DEBUG_ONLY(verify());
189 }
190
191 void CallInfo::set_resolved_method_name(TRAPS) {
192 assert(_resolved_method() != NULL, "Should already have a Method*");
193 oop rmethod_name = java_lang_invoke_ResolvedMethodName::find_resolved_method(_resolved_method, CHECK);
194 _resolved_method_name = Handle(THREAD, rmethod_name);
195 }
196
197 #ifdef ASSERT
198 void CallInfo::verify() {
199 switch (call_kind()) { // the meaning and allowed value of index depends on kind
200 case CallInfo::direct_call:
201 if (_call_index == Method::nonvirtual_vtable_index) break;
202 // else fall through to check vtable index:
203 case CallInfo::vtable_call:
204 assert(resolved_klass()->verify_vtable_index(_call_index), "");
205 break;
206 case CallInfo::itable_call:
207 assert(resolved_method()->method_holder()->verify_itable_index(_call_index), "");
208 break;
209 case CallInfo::unknown_kind:
210 assert(call_kind() != CallInfo::unknown_kind, "CallInfo must be set");
211 break;
212 default:
213 fatal("Unexpected call kind %d", call_kind());
214 }
215 }
216 #endif // ASSERT
217
218 #ifndef PRODUCT
219 void CallInfo::print() {
220 ResourceMark rm;
221 const char* kindstr;
222 switch (_call_kind) {
223 case direct_call: kindstr = "direct"; break;
224 case vtable_call: kindstr = "vtable"; break;
225 case itable_call: kindstr = "itable"; break;
226 default : kindstr = "unknown"; break;
227 }
228 tty->print_cr("Call %s@%d %s", kindstr, _call_index,
229 _resolved_method.is_null() ? "(none)" : _resolved_method->name_and_sig_as_C_string());
230 }
231 #endif
232
233 //------------------------------------------------------------------------------------------------------------------------
234 // Implementation of LinkInfo
235
236 LinkInfo::LinkInfo(const constantPoolHandle& pool, int index, const methodHandle& current_method, TRAPS) {
237 // resolve klass
238 _resolved_klass = pool->klass_ref_at(index, CHECK);
239
240 // Get name, signature, and static klass
241 _name = pool->name_ref_at(index);
242 _signature = pool->signature_ref_at(index);
243 _tag = pool->tag_ref_at(index);
244 _current_klass = pool->pool_holder();
245 _current_method = current_method;
246
247 // Coming from the constant pool always checks access
248 _check_access = true;
249 }
250
251 LinkInfo::LinkInfo(const constantPoolHandle& pool, int index, TRAPS) {
252 // resolve klass
253 _resolved_klass = pool->klass_ref_at(index, CHECK);
254
255 // Get name, signature, and static klass
256 _name = pool->name_ref_at(index);
257 _signature = pool->signature_ref_at(index);
258 _tag = pool->tag_ref_at(index);
259 _current_klass = pool->pool_holder();
260 _current_method = methodHandle();
261
262 // Coming from the constant pool always checks access
263 _check_access = true;
264 }
265
266 #ifndef PRODUCT
267 void LinkInfo::print() {
268 ResourceMark rm;
269 tty->print_cr("Link resolved_klass=%s name=%s signature=%s current_klass=%s check_access=%s",
270 _resolved_klass->name()->as_C_string(),
271 _name->as_C_string(),
272 _signature->as_C_string(),
273 _current_klass == NULL ? "(none)" : _current_klass->name()->as_C_string(),
274 _check_access ? "true" : "false");
275 }
276 #endif // PRODUCT
277 //------------------------------------------------------------------------------------------------------------------------
278 // Klass resolution
279
280 void LinkResolver::check_klass_accessability(Klass* ref_klass, Klass* sel_klass,
281 bool fold_type_to_class, TRAPS) {
282 Klass* base_klass = sel_klass;
283 if (fold_type_to_class) {
284 if (sel_klass->is_objArray_klass()) {
285 base_klass = ObjArrayKlass::cast(sel_klass)->bottom_klass();
286 }
287 // The element type could be a typeArray - we only need the access
288 // check if it is a reference to another class.
289 if (!base_klass->is_instance_klass()) {
290 return; // no relevant check to do
291 }
292 }
293 Reflection::VerifyClassAccessResults vca_result =
294 Reflection::verify_class_access(ref_klass, InstanceKlass::cast(base_klass), true);
295 if (vca_result != Reflection::ACCESS_OK) {
296 ResourceMark rm(THREAD);
297 char* msg = Reflection::verify_class_access_msg(ref_klass,
298 InstanceKlass::cast(base_klass),
299 vca_result);
300 bool same_module = (base_klass->module() == ref_klass->module());
301 if (msg == NULL) {
302 Exceptions::fthrow(
303 THREAD_AND_LOCATION,
304 vmSymbols::java_lang_IllegalAccessError(),
305 "failed to access class %s from class %s (%s%s%s)",
306 base_klass->external_name(),
307 ref_klass->external_name(),
308 (same_module) ? base_klass->joint_in_module_of_loader(ref_klass) : base_klass->class_in_module_of_loader(),
309 (same_module) ? "" : "; ",
310 (same_module) ? "" : ref_klass->class_in_module_of_loader());
311 } else {
312 // Use module specific message returned by verify_class_access_msg().
313 Exceptions::fthrow(
314 THREAD_AND_LOCATION,
315 vmSymbols::java_lang_IllegalAccessError(),
316 "%s", msg);
317 }
318 }
319 }
320
321 //------------------------------------------------------------------------------------------------------------------------
322 // Method resolution
323 //
324 // According to JVM spec. $5.4.3c & $5.4.3d
325
326 // Look up method in klasses, including static methods
327 // Then look up local default methods
328 Method* LinkResolver::lookup_method_in_klasses(const LinkInfo& link_info,
329 bool checkpolymorphism,
330 bool in_imethod_resolve) {
331 NoSafepointVerifier nsv; // Method* returned may not be reclaimed
332
333 Klass* klass = link_info.resolved_klass();
334 Symbol* name = link_info.name();
335 Symbol* signature = link_info.signature();
336
337 // Ignore overpasses so statics can be found during resolution
338 Method* result = klass->uncached_lookup_method(name, signature, Klass::skip_overpass);
339
340 if (klass->is_array_klass()) {
341 // Only consider klass and super klass for arrays
342 return result;
343 }
344
345 InstanceKlass* ik = InstanceKlass::cast(klass);
346
347 // JDK 8, JVMS 5.4.3.4: Interface method resolution should
348 // ignore static and non-public methods of java.lang.Object,
349 // like clone, finalize, registerNatives.
350 if (in_imethod_resolve &&
351 result != NULL &&
352 ik->is_interface() &&
353 (result->is_static() || !result->is_public()) &&
354 result->method_holder() == SystemDictionary::Object_klass()) {
355 result = NULL;
356 }
357
358 // Before considering default methods, check for an overpass in the
359 // current class if a method has not been found.
360 if (result == NULL) {
361 result = ik->find_method(name, signature);
362 }
363
364 if (result == NULL) {
365 Array<Method*>* default_methods = ik->default_methods();
366 if (default_methods != NULL) {
367 result = InstanceKlass::find_method(default_methods, name, signature);
368 }
369 }
370
371 if (checkpolymorphism && result != NULL) {
372 vmIntrinsics::ID iid = result->intrinsic_id();
373 if (MethodHandles::is_signature_polymorphic(iid)) {
374 // Do not link directly to these. The VM must produce a synthetic one using lookup_polymorphic_method.
375 return NULL;
376 }
377 }
378 return result;
379 }
380
381 // returns first instance method
382 // Looks up method in classes, then looks up local default methods
383 Method* LinkResolver::lookup_instance_method_in_klasses(Klass* klass,
384 Symbol* name,
385 Symbol* signature,
386 Klass::PrivateLookupMode private_mode, TRAPS) {
387 Method* result = klass->uncached_lookup_method(name, signature, Klass::find_overpass, private_mode);
388
389 while (result != NULL && result->is_static() && result->method_holder()->super() != NULL) {
390 Klass* super_klass = result->method_holder()->super();
391 result = super_klass->uncached_lookup_method(name, signature, Klass::find_overpass, private_mode);
392 }
393
394 if (klass->is_array_klass()) {
395 // Only consider klass and super klass for arrays
396 return result;
397 }
398
399 if (result == NULL) {
400 Array<Method*>* default_methods = InstanceKlass::cast(klass)->default_methods();
401 if (default_methods != NULL) {
402 result = InstanceKlass::find_method(default_methods, name, signature);
403 assert(result == NULL || !result->is_static(), "static defaults not allowed");
404 }
405 }
406 return result;
407 }
408
409 int LinkResolver::vtable_index_of_interface_method(Klass* klass,
410 const methodHandle& resolved_method) {
411
412 int vtable_index = Method::invalid_vtable_index;
413 Symbol* name = resolved_method->name();
414 Symbol* signature = resolved_method->signature();
415 InstanceKlass* ik = InstanceKlass::cast(klass);
416
417 // First check in default method array
418 if (!resolved_method->is_abstract() && ik->default_methods() != NULL) {
419 int index = InstanceKlass::find_method_index(ik->default_methods(),
420 name, signature, Klass::find_overpass,
421 Klass::find_static, Klass::find_private);
422 if (index >= 0 ) {
423 vtable_index = ik->default_vtable_indices()->at(index);
424 }
425 }
426 if (vtable_index == Method::invalid_vtable_index) {
427 // get vtable_index for miranda methods
428 klassVtable vt = ik->vtable();
429 vtable_index = vt.index_of_miranda(name, signature);
430 }
431 return vtable_index;
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::skip_defaults);
441 }
442
443 Method* LinkResolver::lookup_polymorphic_method(const LinkInfo& link_info,
444 Handle *appendix_result_or_null,
445 TRAPS) {
446 Klass* klass = link_info.resolved_klass();
447 Symbol* name = link_info.name();
448 Symbol* full_signature = link_info.signature();
449
450 vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name);
451 if (TraceMethodHandles) {
452 ResourceMark rm(THREAD);
453 tty->print_cr("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 }
457 if ((klass == SystemDictionary::MethodHandle_klass() ||
458 klass == SystemDictionary::VarHandle_klass()) &&
459 iid != vmIntrinsics::_none) {
460 if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) {
461 // Most of these do not need an up-call to Java to resolve, so can be done anywhere.
462 // Do not erase last argument type (MemberName) if it is a static linkTo method.
463 bool keep_last_arg = MethodHandles::is_signature_polymorphic_static(iid);
464 TempNewSymbol basic_signature =
465 MethodHandles::lookup_basic_type_signature(full_signature, keep_last_arg, CHECK_NULL);
466 if (TraceMethodHandles) {
467 ResourceMark rm(THREAD);
468 tty->print_cr("lookup_polymorphic_method %s %s => basic %s",
469 name->as_C_string(),
470 full_signature->as_C_string(),
471 basic_signature->as_C_string());
472 }
473 Method* result = SystemDictionary::find_method_handle_intrinsic(iid,
474 basic_signature,
475 CHECK_NULL);
476 if (result != NULL) {
477 assert(result->is_method_handle_intrinsic(), "MH.invokeBasic or MH.linkTo* intrinsic");
478 assert(result->intrinsic_id() != vmIntrinsics::_invokeGeneric, "wrong place to find this");
479 assert(basic_signature == result->signature(), "predict the result signature");
480 if (TraceMethodHandles) {
481 ttyLocker ttyl;
482 tty->print("lookup_polymorphic_method => intrinsic ");
483 result->print_on(tty);
484 }
485 }
486 return result;
487 } else if (iid == vmIntrinsics::_invokeGeneric
488 && THREAD->can_call_java()
489 && appendix_result_or_null != NULL) {
490 // This is a method with type-checking semantics.
491 // We will ask Java code to spin an adapter method for it.
492 if (!MethodHandles::enabled()) {
493 // Make sure the Java part of the runtime has been booted up.
494 Klass* natives = SystemDictionary::MethodHandleNatives_klass();
495 if (natives == NULL || InstanceKlass::cast(natives)->is_not_initialized()) {
496 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_invoke_MethodHandleNatives(),
497 Handle(),
498 Handle(),
499 true,
500 CHECK_NULL);
501 }
502 }
503
504 Handle appendix;
505 Handle method_type;
506 Method* result = SystemDictionary::find_method_handle_invoker(
507 klass,
508 name,
509 full_signature,
510 link_info.current_klass(),
511 &appendix,
512 CHECK_NULL);
513 if (TraceMethodHandles) {
514 ttyLocker ttyl;
515 tty->print("lookup_polymorphic_method => (via Java) ");
516 result->print_on(tty);
517 tty->print(" lookup_polymorphic_method => appendix = ");
518 if (appendix.is_null()) tty->print_cr("(none)");
519 else appendix->print_on(tty);
520 }
521 if (result != NULL) {
522 #ifdef ASSERT
523 ResourceMark rm(THREAD);
524
525 TempNewSymbol basic_signature =
526 MethodHandles::lookup_basic_type_signature(full_signature, CHECK_NULL);
527 int actual_size_of_params = result->size_of_parameters();
528 int expected_size_of_params = ArgumentSizeComputer(basic_signature).size();
529 // +1 for MethodHandle.this, +1 for trailing MethodType
530 if (!MethodHandles::is_signature_polymorphic_static(iid)) expected_size_of_params += 1;
531 if (appendix.not_null()) expected_size_of_params += 1;
532 if (actual_size_of_params != expected_size_of_params) {
533 tty->print_cr("*** basic_signature=%s", basic_signature->as_C_string());
534 tty->print_cr("*** result for %s: ", vmIntrinsics::name_at(iid));
535 result->print();
536 }
537 assert(actual_size_of_params == expected_size_of_params,
538 "%d != %d", actual_size_of_params, expected_size_of_params);
539 #endif //ASSERT
540
541 assert(appendix_result_or_null != NULL, "");
542 (*appendix_result_or_null) = appendix;
543 }
544 return result;
545 }
546 }
547 return NULL;
548 }
549
550 void LinkResolver::check_method_accessability(Klass* ref_klass,
551 Klass* resolved_klass,
552 Klass* sel_klass,
553 const methodHandle& sel_method,
554 TRAPS) {
555
556 AccessFlags flags = sel_method->access_flags();
557
558 // Special case: arrays always override "clone". JVMS 2.15.
559 // If the resolved klass is an array class, and the declaring class
560 // is java.lang.Object and the method is "clone", set the flags
561 // to public.
562 //
563 // We'll check for the method name first, as that's most likely
564 // to be false (so we'll short-circuit out of these tests).
565 if (sel_method->name() == vmSymbols::clone_name() &&
566 sel_klass == SystemDictionary::Object_klass() &&
567 resolved_klass->is_array_klass()) {
568 // We need to change "protected" to "public".
569 assert(flags.is_protected(), "clone not protected?");
570 jint new_flags = flags.as_int();
571 new_flags = new_flags & (~JVM_ACC_PROTECTED);
572 new_flags = new_flags | JVM_ACC_PUBLIC;
573 flags.set_flags(new_flags);
574 }
575 // assert(extra_arg_result_or_null != NULL, "must be able to return extra argument");
576
577 bool can_access = Reflection::verify_member_access(ref_klass,
578 resolved_klass,
579 sel_klass,
580 flags,
581 true, false, CHECK);
582 // Any existing exceptions that may have been thrown, for example LinkageErrors
583 // from nest-host resolution, have been allowed to propagate.
584 if (!can_access) {
585 ResourceMark rm(THREAD);
586 bool same_module = (sel_klass->module() == ref_klass->module());
587 Exceptions::fthrow(
588 THREAD_AND_LOCATION,
589 vmSymbols::java_lang_IllegalAccessError(),
590 "class %s tried to access %s%s%smethod '%s' (%s%s%s)",
591 ref_klass->external_name(),
592 sel_method->is_abstract() ? "abstract " : "",
593 sel_method->is_protected() ? "protected " : "",
594 sel_method->is_private() ? "private " : "",
595 sel_method->external_name(),
596 (same_module) ? ref_klass->joint_in_module_of_loader(sel_klass) : ref_klass->class_in_module_of_loader(),
597 (same_module) ? "" : "; ",
598 (same_module) ? "" : sel_klass->class_in_module_of_loader()
599 );
600 return;
601 }
602 }
603
604 Method* LinkResolver::resolve_method_statically(Bytecodes::Code code,
605 const constantPoolHandle& pool, int index, TRAPS) {
606 // This method is used only
607 // (1) in C2 from InlineTree::ok_to_inline (via ciMethod::check_call),
608 // and
609 // (2) in Bytecode_invoke::static_target
610 // It appears to fail when applied to an invokeinterface call site.
611 // FIXME: Remove this method and ciMethod::check_call; refactor to use the other LinkResolver entry points.
612 // resolve klass
613 if (code == Bytecodes::_invokedynamic) {
614 Klass* resolved_klass = SystemDictionary::MethodHandle_klass();
615 Symbol* method_name = vmSymbols::invoke_name();
616 Symbol* method_signature = pool->signature_ref_at(index);
617 Klass* current_klass = pool->pool_holder();
618 LinkInfo link_info(resolved_klass, method_name, method_signature, current_klass);
619 return resolve_method(link_info, code, THREAD);
620 }
621
622 LinkInfo link_info(pool, index, methodHandle(), CHECK_NULL);
623 Klass* resolved_klass = link_info.resolved_klass();
624
625 if (pool->has_preresolution()
626 || (resolved_klass == SystemDictionary::MethodHandle_klass() &&
627 MethodHandles::is_signature_polymorphic_name(resolved_klass, link_info.name()))) {
628 Method* result = ConstantPool::method_at_if_loaded(pool, index);
629 if (result != NULL) {
630 return result;
631 }
632 }
633
634 if (code == Bytecodes::_invokeinterface) {
635 return resolve_interface_method(link_info, code, THREAD);
636 } else if (code == Bytecodes::_invokevirtual) {
637 return resolve_method(link_info, code, THREAD);
638 } else if (!resolved_klass->is_interface()) {
639 return resolve_method(link_info, code, THREAD);
640 } else {
641 return resolve_interface_method(link_info, code, THREAD);
642 }
643 }
644
645 // Check and print a loader constraint violation message for method or interface method
646 void LinkResolver::check_method_loader_constraints(const LinkInfo& link_info,
647 const methodHandle& resolved_method,
648 const char* method_type, TRAPS) {
649 Handle current_loader(THREAD, link_info.current_klass()->class_loader());
650 Handle resolved_loader(THREAD, resolved_method->method_holder()->class_loader());
651
652 ResourceMark rm(THREAD);
653 Symbol* failed_type_symbol =
654 SystemDictionary::check_signature_loaders(link_info.signature(), current_loader,
655 resolved_loader, true, CHECK);
656 if (failed_type_symbol != NULL) {
657 Klass* current_class = link_info.current_klass();
658 ClassLoaderData* current_loader_data = current_class->class_loader_data();
659 assert(current_loader_data != NULL, "current class has no class loader data");
660 Klass* resolved_method_class = resolved_method->method_holder();
661 ClassLoaderData* target_loader_data = resolved_method_class->class_loader_data();
662 assert(target_loader_data != NULL, "resolved method's class has no class loader data");
663
664 stringStream ss;
665 ss.print("loader constraint violation: when resolving %s '", method_type);
666 Method::print_external_name(&ss, link_info.resolved_klass(), link_info.name(), link_info.signature());
667 ss.print("' the class loader %s of the current class, %s,"
668 " and the class loader %s for the method's defining class, %s, have"
669 " different Class objects for the type %s used in the signature (%s; %s)",
670 current_loader_data->loader_name_and_id(),
671 current_class->name()->as_C_string(),
672 target_loader_data->loader_name_and_id(),
673 resolved_method_class->name()->as_C_string(),
674 failed_type_symbol->as_C_string(),
675 current_class->class_in_module_of_loader(false, true),
676 resolved_method_class->class_in_module_of_loader(false, true));
677 THROW_MSG(vmSymbols::java_lang_LinkageError(), ss.as_string());
678 }
679 }
680
681 void LinkResolver::check_field_loader_constraints(Symbol* field, Symbol* sig,
682 Klass* current_klass,
683 Klass* sel_klass, TRAPS) {
684 Handle ref_loader(THREAD, current_klass->class_loader());
685 Handle sel_loader(THREAD, sel_klass->class_loader());
686
687 ResourceMark rm(THREAD); // needed for check_signature_loaders
688 Symbol* failed_type_symbol =
689 SystemDictionary::check_signature_loaders(sig,
690 ref_loader, sel_loader,
691 false,
692 CHECK);
693 if (failed_type_symbol != NULL) {
694 stringStream ss;
695 const char* failed_type_name = failed_type_symbol->as_klass_external_name();
696
697 ss.print("loader constraint violation: when resolving field \"%s\" of type %s, "
698 "the class loader %s of the current class, %s, "
699 "and the class loader %s for the field's defining %s, %s, "
700 "have different Class objects for type %s (%s; %s)",
701 field->as_C_string(),
702 failed_type_name,
703 current_klass->class_loader_data()->loader_name_and_id(),
704 current_klass->external_name(),
705 sel_klass->class_loader_data()->loader_name_and_id(),
706 sel_klass->external_kind(),
707 sel_klass->external_name(),
708 failed_type_name,
709 current_klass->class_in_module_of_loader(false, true),
710 sel_klass->class_in_module_of_loader(false, true));
711 THROW_MSG(vmSymbols::java_lang_LinkageError(), ss.as_string());
712 }
713 }
714
715 Method* LinkResolver::resolve_method(const LinkInfo& link_info,
716 Bytecodes::Code code, TRAPS) {
717
718 Handle nested_exception;
719 Klass* resolved_klass = link_info.resolved_klass();
720
721 // 1. For invokevirtual, cannot call an interface method
722 if (code == Bytecodes::_invokevirtual && resolved_klass->is_interface()) {
723 ResourceMark rm(THREAD);
724 char buf[200];
725 jio_snprintf(buf, sizeof(buf), "Found interface %s, but class was expected",
726 resolved_klass->external_name());
727 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
728 }
729
730 // 2. check constant pool tag for called method - must be JVM_CONSTANT_Methodref
731 if (!link_info.tag().is_invalid() && !link_info.tag().is_method()) {
732 ResourceMark rm(THREAD);
733 stringStream ss;
734 ss.print("Method '");
735 Method::print_external_name(&ss, link_info.resolved_klass(), link_info.name(), link_info.signature());
736 ss.print("' must be Methodref constant");
737 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
738 }
739
740 // 3. lookup method in resolved klass and its super klasses
741 methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, true, false));
742
743 // 4. lookup method in all the interfaces implemented by the resolved klass
744 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) { // not found in the class hierarchy
745 resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info));
746
747 if (resolved_method.is_null()) {
748 // JSR 292: see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc
749 Method* method = lookup_polymorphic_method(link_info, (Handle*)NULL, THREAD);
750 resolved_method = methodHandle(THREAD, method);
751 if (HAS_PENDING_EXCEPTION) {
752 nested_exception = Handle(THREAD, PENDING_EXCEPTION);
753 CLEAR_PENDING_EXCEPTION;
754 }
755 }
756 }
757
758 // 5. method lookup failed
759 if (resolved_method.is_null()) {
760 ResourceMark rm(THREAD);
761 stringStream ss;
762 ss.print("'");
763 Method::print_external_name(&ss, resolved_klass, link_info.name(), link_info.signature());
764 ss.print("'");
765 THROW_MSG_CAUSE_(vmSymbols::java_lang_NoSuchMethodError(),
766 ss.as_string(), nested_exception, NULL);
767 }
768
769 // 6. access checks, access checking may be turned off when calling from within the VM.
770 Klass* current_klass = link_info.current_klass();
771 if (link_info.check_access()) {
772 assert(current_klass != NULL , "current_klass should not be null");
773
774 // check if method can be accessed by the referring class
775 check_method_accessability(current_klass,
776 resolved_klass,
777 resolved_method->method_holder(),
778 resolved_method,
779 CHECK_NULL);
780
781 // check loader constraints
782 check_method_loader_constraints(link_info, resolved_method, "method", CHECK_NULL);
783 }
784
785 return resolved_method();
786 }
787
788 static void trace_method_resolution(const char* prefix,
789 Klass* klass,
790 Klass* resolved_klass,
791 Method* method,
792 bool logitables,
793 int index = -1) {
794 #ifndef PRODUCT
795 ResourceMark rm;
796 Log(itables) logi;
797 LogStream lsi(logi.trace());
798 Log(vtables) logv;
799 LogStream lsv(logv.trace());
800 outputStream* st;
801 if (logitables) {
802 st = &lsi;
803 } else {
804 st = &lsv;
805 }
806 st->print("%s%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ",
807 prefix,
808 (klass == NULL ? "<NULL>" : klass->internal_name()),
809 (resolved_klass == NULL ? "<NULL>" : resolved_klass->internal_name()),
810 Method::name_and_sig_as_C_string(resolved_klass,
811 method->name(),
812 method->signature()),
813 method->method_holder()->internal_name());
814 method->print_linkage_flags(st);
815 if (index != -1) {
816 st->print("vtable_index:%d", index);
817 }
818 st->cr();
819 #endif // PRODUCT
820 }
821
822 // Do linktime resolution of a method in the interface within the context of the specied bytecode.
823 Method* LinkResolver::resolve_interface_method(const LinkInfo& link_info, Bytecodes::Code code, TRAPS) {
824
825 Klass* resolved_klass = link_info.resolved_klass();
826
827 // check if klass is interface
828 if (!resolved_klass->is_interface()) {
829 ResourceMark rm(THREAD);
830 char buf[200];
831 jio_snprintf(buf, sizeof(buf), "Found class %s, but interface was expected", resolved_klass->external_name());
832 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
833 }
834
835 // check constant pool tag for called method - must be JVM_CONSTANT_InterfaceMethodref
836 if (!link_info.tag().is_invalid() && !link_info.tag().is_interface_method()) {
837 ResourceMark rm(THREAD);
838 stringStream ss;
839 ss.print("Method '");
840 Method::print_external_name(&ss, link_info.resolved_klass(), link_info.name(), link_info.signature());
841 ss.print("' must be InterfaceMethodref constant");
842 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
843 }
844
845 // lookup method in this interface or its super, java.lang.Object
846 // JDK8: also look for static methods
847 methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, false, true));
848
849 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) {
850 // lookup method in all the super-interfaces
851 resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info));
852 }
853
854 if (resolved_method.is_null()) {
855 // no method found
856 ResourceMark rm(THREAD);
857 stringStream ss;
858 ss.print("'");
859 Method::print_external_name(&ss, resolved_klass, link_info.name(), link_info.signature());
860 ss.print("'");
861 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), ss.as_string());
862 }
863
864 if (link_info.check_access()) {
865 // JDK8 adds non-public interface methods, and accessability check requirement
866 Klass* current_klass = link_info.current_klass();
867
868 assert(current_klass != NULL , "current_klass should not be null");
869
870 // check if method can be accessed by the referring class
871 check_method_accessability(current_klass,
872 resolved_klass,
873 resolved_method->method_holder(),
874 resolved_method,
875 CHECK_NULL);
876
877 check_method_loader_constraints(link_info, resolved_method, "interface method", CHECK_NULL);
878 }
879
880 if (code != Bytecodes::_invokestatic && resolved_method->is_static()) {
881 ResourceMark rm(THREAD);
882 stringStream ss;
883 ss.print("Expected instance not static method '");
884 Method::print_external_name(&ss, resolved_klass,
885 resolved_method->name(), resolved_method->signature());
886 ss.print("'");
887 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
888 }
889
890 if (log_develop_is_enabled(Trace, itables)) {
891 char buf[200];
892 jio_snprintf(buf, sizeof(buf), "%s resolved interface method: caller-class:",
893 Bytecodes::name(code));
894 trace_method_resolution(buf, link_info.current_klass(), resolved_klass, resolved_method(), true);
895 }
896
897 return resolved_method();
898 }
899
900 //------------------------------------------------------------------------------------------------------------------------
901 // Field resolution
902
903 void LinkResolver::check_field_accessability(Klass* ref_klass,
904 Klass* resolved_klass,
905 Klass* sel_klass,
906 const fieldDescriptor& fd,
907 TRAPS) {
908 bool can_access = Reflection::verify_member_access(ref_klass,
909 resolved_klass,
910 sel_klass,
911 fd.access_flags(),
912 true, false, CHECK);
913 // Any existing exceptions that may have been thrown, for example LinkageErrors
914 // from nest-host resolution, have been allowed to propagate.
915 if (!can_access) {
916 bool same_module = (sel_klass->module() == ref_klass->module());
917 ResourceMark rm(THREAD);
918 Exceptions::fthrow(
919 THREAD_AND_LOCATION,
920 vmSymbols::java_lang_IllegalAccessError(),
921 "class %s tried to access %s%sfield %s.%s (%s%s%s)",
922 ref_klass->external_name(),
923 fd.is_protected() ? "protected " : "",
924 fd.is_private() ? "private " : "",
925 sel_klass->external_name(),
926 fd.name()->as_C_string(),
927 (same_module) ? ref_klass->joint_in_module_of_loader(sel_klass) : ref_klass->class_in_module_of_loader(),
928 (same_module) ? "" : "; ",
929 (same_module) ? "" : sel_klass->class_in_module_of_loader()
930 );
931 return;
932 }
933 }
934
935 void LinkResolver::resolve_field_access(fieldDescriptor& fd, const constantPoolHandle& pool, int index, const methodHandle& method, Bytecodes::Code byte, TRAPS) {
936 LinkInfo link_info(pool, index, method, CHECK);
937 resolve_field(fd, link_info, byte, true, CHECK);
938 }
939
940 void LinkResolver::resolve_field(fieldDescriptor& fd,
941 const LinkInfo& link_info,
942 Bytecodes::Code byte, bool initialize_class,
943 TRAPS) {
944 assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic ||
945 byte == Bytecodes::_getfield || byte == Bytecodes::_putfield ||
946 byte == Bytecodes::_nofast_getfield || byte == Bytecodes::_nofast_putfield ||
947 (byte == Bytecodes::_nop && !link_info.check_access()), "bad field access bytecode");
948
949 bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic);
950 bool is_put = (byte == Bytecodes::_putfield || byte == Bytecodes::_putstatic || byte == Bytecodes::_nofast_putfield);
951 // Check if there's a resolved klass containing the field
952 Klass* resolved_klass = link_info.resolved_klass();
953 Symbol* field = link_info.name();
954 Symbol* sig = link_info.signature();
955
956 if (resolved_klass == NULL) {
957 ResourceMark rm(THREAD);
958 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
959 }
960
961 // Resolve instance field
962 Klass* sel_klass = resolved_klass->find_field(field, sig, &fd);
963 // check if field exists; i.e., if a klass containing the field def has been selected
964 if (sel_klass == NULL) {
965 ResourceMark rm(THREAD);
966 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
967 }
968
969 // Access checking may be turned off when calling from within the VM.
970 Klass* current_klass = link_info.current_klass();
971 if (link_info.check_access()) {
972
973 // check access
974 check_field_accessability(current_klass, resolved_klass, sel_klass, fd, CHECK);
975
976 // check for errors
977 if (is_static != fd.is_static()) {
978 ResourceMark rm(THREAD);
979 char msg[200];
980 jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string());
981 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg);
982 }
983
984 // A final field can be modified only
985 // (1) by methods declared in the class declaring the field and
986 // (2) by the <clinit> method (in case of a static field)
987 // or by the <init> method (in case of an instance field).
988 if (is_put && fd.access_flags().is_final()) {
989
990 if (sel_klass != current_klass) {
991 ResourceMark rm(THREAD);
992 stringStream ss;
993 ss.print("Update to %s final field %s.%s attempted from a different class (%s) than the field's declaring class",
994 is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(),
995 current_klass->external_name());
996 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
997 }
998
999 if (fd.constants()->pool_holder()->major_version() >= 53) {
1000 Method* m = link_info.current_method();
1001 assert(m != NULL, "information about the current method must be available for 'put' bytecodes");
1002 bool is_initialized_static_final_update = (byte == Bytecodes::_putstatic &&
1003 fd.is_static() &&
1004 !m->is_static_initializer());
1005 bool is_initialized_instance_final_update = ((byte == Bytecodes::_putfield || byte == Bytecodes::_nofast_putfield) &&
1006 !fd.is_static() &&
1007 !m->is_object_initializer());
1008
1009 if (is_initialized_static_final_update || is_initialized_instance_final_update) {
1010 ResourceMark rm(THREAD);
1011 stringStream ss;
1012 ss.print("Update to %s final field %s.%s attempted from a different method (%s) than the initializer method %s ",
1013 is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(),
1014 m->name()->as_C_string(),
1015 is_static ? "<clinit>" : "<init>");
1016 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
1017 }
1018 }
1019 }
1020
1021 // initialize resolved_klass if necessary
1022 // note 1: the klass which declared the field must be initialized (i.e, sel_klass)
1023 // according to the newest JVM spec (5.5, p.170) - was bug (gri 7/28/99)
1024 //
1025 // note 2: we don't want to force initialization if we are just checking
1026 // if the field access is legal; e.g., during compilation
1027 if (is_static && initialize_class) {
1028 sel_klass->initialize(CHECK);
1029 }
1030 }
1031
1032 if ((sel_klass != current_klass) && (current_klass != NULL)) {
1033 check_field_loader_constraints(field, sig, current_klass, sel_klass, CHECK);
1034 }
1035
1036 // return information. note that the klass is set to the actual klass containing the
1037 // field, otherwise access of static fields in superclasses will not work.
1038 }
1039
1040
1041 //------------------------------------------------------------------------------------------------------------------------
1042 // Invoke resolution
1043 //
1044 // Naming conventions:
1045 //
1046 // resolved_method the specified method (i.e., static receiver specified via constant pool index)
1047 // sel_method the selected method (selected via run-time lookup; e.g., based on dynamic receiver class)
1048 // resolved_klass the specified klass (i.e., specified via constant pool index)
1049 // recv_klass the receiver klass
1050
1051
1052 void LinkResolver::resolve_static_call(CallInfo& result,
1053 const LinkInfo& link_info,
1054 bool initialize_class, TRAPS) {
1055 Method* resolved_method = linktime_resolve_static_method(link_info, CHECK);
1056
1057 // The resolved class can change as a result of this resolution.
1058 Klass* resolved_klass = resolved_method->method_holder();
1059
1060 // Initialize klass (this should only happen if everything is ok)
1061 if (initialize_class && resolved_klass->should_be_initialized()) {
1062 resolved_klass->initialize(CHECK);
1063 // Use updated LinkInfo to reresolve with resolved method holder
1064 LinkInfo new_info(resolved_klass, link_info.name(), link_info.signature(),
1065 link_info.current_klass(),
1066 link_info.check_access() ? LinkInfo::needs_access_check : LinkInfo::skip_access_check);
1067 resolved_method = linktime_resolve_static_method(new_info, CHECK);
1068 }
1069
1070 // setup result
1071 result.set_static(resolved_klass, methodHandle(THREAD, resolved_method), CHECK);
1072 }
1073
1074 // throws linktime exceptions
1075 Method* LinkResolver::linktime_resolve_static_method(const LinkInfo& link_info, TRAPS) {
1076
1077 Klass* resolved_klass = link_info.resolved_klass();
1078 Method* resolved_method;
1079 if (!resolved_klass->is_interface()) {
1080 resolved_method = resolve_method(link_info, Bytecodes::_invokestatic, CHECK_NULL);
1081 } else {
1082 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokestatic, CHECK_NULL);
1083 }
1084 assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier");
1085
1086 // check if static
1087 if (!resolved_method->is_static()) {
1088 ResourceMark rm(THREAD);
1089 stringStream ss;
1090 ss.print("Expected static method '");
1091 resolved_method->print_external_name(&ss);
1092 ss.print("'");
1093 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1094 }
1095 return resolved_method;
1096 }
1097
1098
1099 void LinkResolver::resolve_special_call(CallInfo& result,
1100 Handle recv,
1101 const LinkInfo& link_info,
1102 TRAPS) {
1103 Method* resolved_method = linktime_resolve_special_method(link_info, CHECK);
1104 runtime_resolve_special_method(result, link_info, methodHandle(THREAD, resolved_method), recv, CHECK);
1105 }
1106
1107 // throws linktime exceptions
1108 Method* LinkResolver::linktime_resolve_special_method(const LinkInfo& link_info, TRAPS) {
1109
1110 // Invokespecial is called for multiple special reasons:
1111 // <init>
1112 // local private method invocation, for classes and interfaces
1113 // superclass.method, which can also resolve to a default method
1114 // and the selected method is recalculated relative to the direct superclass
1115 // superinterface.method, which explicitly does not check shadowing
1116 Klass* resolved_klass = link_info.resolved_klass();
1117 Method* resolved_method;
1118
1119 if (!resolved_klass->is_interface()) {
1120 resolved_method = resolve_method(link_info, Bytecodes::_invokespecial, CHECK_NULL);
1121 } else {
1122 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokespecial, CHECK_NULL);
1123 }
1124
1125 // check if method name is <init>, that it is found in same klass as static type
1126 if (resolved_method->name() == vmSymbols::object_initializer_name() &&
1127 resolved_method->method_holder() != resolved_klass) {
1128 ResourceMark rm(THREAD);
1129 stringStream ss;
1130 ss.print("%s: method '", resolved_klass->external_name());
1131 resolved_method->signature()->print_as_signature_external_return_type(&ss);
1132 ss.print(" %s(", resolved_method->name()->as_C_string());
1133 resolved_method->signature()->print_as_signature_external_parameters(&ss);
1134 ss.print(")' not found");
1135 Exceptions::fthrow(
1136 THREAD_AND_LOCATION,
1137 vmSymbols::java_lang_NoSuchMethodError(),
1138 "%s", ss.as_string());
1139 return NULL;
1140 }
1141
1142 // ensure that invokespecial's interface method reference is in
1143 // a direct superinterface, not an indirect superinterface
1144 Klass* current_klass = link_info.current_klass();
1145 if (current_klass != NULL && resolved_klass->is_interface()) {
1146 InstanceKlass* ck = InstanceKlass::cast(current_klass);
1147 InstanceKlass *klass_to_check = !ck->is_unsafe_anonymous() ?
1148 ck :
1149 ck->unsafe_anonymous_host();
1150 // Disable verification for the dynamically-generated reflection bytecodes.
1151 bool is_reflect = klass_to_check->is_subclass_of(
1152 SystemDictionary::reflect_MagicAccessorImpl_klass());
1153
1154 if (!is_reflect &&
1155 !klass_to_check->is_same_or_direct_interface(resolved_klass)) {
1156 ResourceMark rm(THREAD);
1157 stringStream ss;
1158 ss.print("Interface method reference: '");
1159 resolved_method->print_external_name(&ss);
1160 ss.print("', is in an indirect superinterface of %s",
1161 current_klass->external_name());
1162 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1163 }
1164 }
1165
1166 // check if not static
1167 if (resolved_method->is_static()) {
1168 ResourceMark rm(THREAD);
1169 stringStream ss;
1170 ss.print("Expecting non-static method '");
1171 resolved_method->print_external_name(&ss);
1172 ss.print("'");
1173 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1174 }
1175
1176 if (log_develop_is_enabled(Trace, itables)) {
1177 trace_method_resolution("invokespecial resolved method: caller-class:",
1178 current_klass, resolved_klass, resolved_method, true);
1179 }
1180
1181 return resolved_method;
1182 }
1183
1184 // throws runtime exceptions
1185 void LinkResolver::runtime_resolve_special_method(CallInfo& result,
1186 const LinkInfo& link_info,
1187 const methodHandle& resolved_method,
1188 Handle recv, TRAPS) {
1189
1190 Klass* resolved_klass = link_info.resolved_klass();
1191
1192 // resolved method is selected method unless we have an old-style lookup
1193 // for a superclass method
1194 // Invokespecial for a superinterface, resolved method is selected method,
1195 // no checks for shadowing
1196 methodHandle sel_method(THREAD, resolved_method());
1197
1198 if (link_info.check_access() &&
1199 // check if the method is not <init>
1200 resolved_method->name() != vmSymbols::object_initializer_name()) {
1201
1202 Klass* current_klass = link_info.current_klass();
1203
1204 // Check if the class of the resolved_klass is a superclass
1205 // (not supertype in order to exclude interface classes) of the current class.
1206 // This check is not performed for super.invoke for interface methods
1207 // in super interfaces.
1208 if (current_klass->is_subclass_of(resolved_klass) &&
1209 current_klass != resolved_klass) {
1210 // Lookup super method
1211 Klass* super_klass = current_klass->super();
1212 Method* instance_method = lookup_instance_method_in_klasses(super_klass,
1213 resolved_method->name(),
1214 resolved_method->signature(),
1215 Klass::find_private, CHECK);
1216 sel_method = methodHandle(THREAD, instance_method);
1217
1218 // check if found
1219 if (sel_method.is_null()) {
1220 ResourceMark rm(THREAD);
1221 stringStream ss;
1222 ss.print("'");
1223 resolved_method->print_external_name(&ss);
1224 ss.print("'");
1225 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1226 // check loader constraints if found a different method
1227 } else if (sel_method() != resolved_method()) {
1228 check_method_loader_constraints(link_info, sel_method, "method", CHECK);
1229 }
1230 }
1231
1232 // Check that the class of objectref (the receiver) is the current class or interface,
1233 // or a subtype of the current class or interface (the sender), otherwise invokespecial
1234 // throws IllegalAccessError.
1235 // The verifier checks that the sender is a subtype of the class in the I/MR operand.
1236 // The verifier also checks that the receiver is a subtype of the sender, if the sender is
1237 // a class. If the sender is an interface, the check has to be performed at runtime.
1238 InstanceKlass* sender = InstanceKlass::cast(current_klass);
1239 sender = sender->is_unsafe_anonymous() ? sender->unsafe_anonymous_host() : sender;
1240 if (sender->is_interface() && recv.not_null()) {
1241 Klass* receiver_klass = recv->klass();
1242 if (!receiver_klass->is_subtype_of(sender)) {
1243 ResourceMark rm(THREAD);
1244 char buf[500];
1245 jio_snprintf(buf, sizeof(buf),
1246 "Receiver class %s must be the current class or a subtype of interface %s",
1247 receiver_klass->external_name(),
1248 sender->external_name());
1249 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), buf);
1250 }
1251 }
1252 }
1253
1254 // check if not static
1255 if (sel_method->is_static()) {
1256 ResourceMark rm(THREAD);
1257 stringStream ss;
1258 ss.print("Expecting non-static method '");
1259 resolved_method->print_external_name(&ss);
1260 ss.print("'");
1261 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1262 }
1263
1264 // check if abstract
1265 if (sel_method->is_abstract()) {
1266 ResourceMark rm(THREAD);
1267 stringStream ss;
1268 ss.print("'");
1269 Method::print_external_name(&ss, resolved_klass, sel_method->name(), sel_method->signature());
1270 ss.print("'");
1271 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1272 }
1273
1274 if (log_develop_is_enabled(Trace, itables)) {
1275 trace_method_resolution("invokespecial selected method: resolved-class:",
1276 resolved_klass, resolved_klass, sel_method(), true);
1277 }
1278
1279 // setup result
1280 result.set_static(resolved_klass, sel_method, CHECK);
1281 }
1282
1283 void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, Klass* receiver_klass,
1284 const LinkInfo& link_info,
1285 bool check_null_and_abstract, TRAPS) {
1286 Method* resolved_method = linktime_resolve_virtual_method(link_info, CHECK);
1287 runtime_resolve_virtual_method(result, methodHandle(THREAD, resolved_method),
1288 link_info.resolved_klass(),
1289 recv, receiver_klass,
1290 check_null_and_abstract, CHECK);
1291 }
1292
1293 // throws linktime exceptions
1294 Method* LinkResolver::linktime_resolve_virtual_method(const LinkInfo& link_info,
1295 TRAPS) {
1296 // normal method resolution
1297 Method* resolved_method = resolve_method(link_info, Bytecodes::_invokevirtual, CHECK_NULL);
1298
1299 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1300 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1301
1302 // check if private interface method
1303 Klass* resolved_klass = link_info.resolved_klass();
1304 Klass* current_klass = link_info.current_klass();
1305
1306 // This is impossible, if resolve_klass is an interface, we've thrown icce in resolve_method
1307 if (resolved_klass->is_interface() && resolved_method->is_private()) {
1308 ResourceMark rm(THREAD);
1309 stringStream ss;
1310 ss.print("private interface method requires invokespecial, not invokevirtual: method '");
1311 resolved_method->print_external_name(&ss);
1312 ss.print("', caller-class: %s",
1313 (current_klass == NULL ? "<null>" : current_klass->internal_name()));
1314 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1315 }
1316
1317 // check if not static
1318 if (resolved_method->is_static()) {
1319 ResourceMark rm(THREAD);
1320 stringStream ss;
1321 ss.print("Expecting non-static method '");
1322 resolved_method->print_external_name(&ss);
1323 ss.print("'");
1324 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1325 }
1326
1327 if (log_develop_is_enabled(Trace, vtables)) {
1328 trace_method_resolution("invokevirtual resolved method: caller-class:",
1329 current_klass, resolved_klass, resolved_method, false);
1330 }
1331
1332 return resolved_method;
1333 }
1334
1335 // throws runtime exceptions
1336 void LinkResolver::runtime_resolve_virtual_method(CallInfo& result,
1337 const methodHandle& resolved_method,
1338 Klass* resolved_klass,
1339 Handle recv,
1340 Klass* recv_klass,
1341 bool check_null_and_abstract,
1342 TRAPS) {
1343
1344 // setup default return values
1345 int vtable_index = Method::invalid_vtable_index;
1346 methodHandle selected_method;
1347
1348 // runtime method resolution
1349 if (check_null_and_abstract && recv.is_null()) { // check if receiver exists
1350 THROW(vmSymbols::java_lang_NullPointerException());
1351 }
1352
1353 // Virtual methods cannot be resolved before its klass has been linked, for otherwise the Method*'s
1354 // has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since
1355 // a missing receiver might result in a bogus lookup.
1356 assert(resolved_method->method_holder()->is_linked(), "must be linked");
1357
1358 // do lookup based on receiver klass using the vtable index
1359 if (resolved_method->method_holder()->is_interface()) { // default or miranda method
1360 vtable_index = vtable_index_of_interface_method(resolved_klass, resolved_method);
1361 assert(vtable_index >= 0 , "we should have valid vtable index at this point");
1362
1363 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1364 } else {
1365 // at this point we are sure that resolved_method is virtual and not
1366 // a default or miranda method; therefore, it must have a valid vtable index.
1367 assert(!resolved_method->has_itable_index(), "");
1368 vtable_index = resolved_method->vtable_index();
1369 // We could get a negative vtable_index of nonvirtual_vtable_index for private
1370 // methods, or for final methods. Private methods never appear in the vtable
1371 // and never override other methods. As an optimization, final methods are
1372 // never put in the vtable, unless they override an existing method.
1373 // So if we do get nonvirtual_vtable_index, it means the selected method is the
1374 // resolved method, and it can never be changed by an override.
1375 if (vtable_index == Method::nonvirtual_vtable_index) {
1376 assert(resolved_method->can_be_statically_bound(), "cannot override this method");
1377 selected_method = resolved_method;
1378 } else {
1379 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1380 }
1381 }
1382
1383 // check if method exists
1384 if (selected_method.is_null()) {
1385 throw_abstract_method_error(resolved_method, recv_klass, CHECK);
1386 }
1387
1388 // check if abstract
1389 if (check_null_and_abstract && selected_method->is_abstract()) {
1390 // Pass arguments for generating a verbose error message.
1391 throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK);
1392 }
1393
1394 if (log_develop_is_enabled(Trace, vtables)) {
1395 trace_method_resolution("invokevirtual selected method: receiver-class:",
1396 recv_klass, resolved_klass, selected_method(),
1397 false, vtable_index);
1398 }
1399 // setup result
1400 result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK);
1401 }
1402
1403 void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, Klass* recv_klass,
1404 const LinkInfo& link_info,
1405 bool check_null_and_abstract, TRAPS) {
1406 // throws linktime exceptions
1407 Method* resolved_method = linktime_resolve_interface_method(link_info, CHECK);
1408 methodHandle mh(THREAD, resolved_method);
1409 runtime_resolve_interface_method(result, mh, link_info.resolved_klass(),
1410 recv, recv_klass, check_null_and_abstract, CHECK);
1411 }
1412
1413 Method* LinkResolver::linktime_resolve_interface_method(const LinkInfo& link_info,
1414 TRAPS) {
1415 // normal interface method resolution
1416 Method* resolved_method = resolve_interface_method(link_info, Bytecodes::_invokeinterface, CHECK_NULL);
1417 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1418 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1419
1420 return resolved_method;
1421 }
1422
1423 // throws runtime exceptions
1424 void LinkResolver::runtime_resolve_interface_method(CallInfo& result,
1425 const methodHandle& resolved_method,
1426 Klass* resolved_klass,
1427 Handle recv,
1428 Klass* recv_klass,
1429 bool check_null_and_abstract, TRAPS) {
1430
1431 // check if receiver exists
1432 if (check_null_and_abstract && recv.is_null()) {
1433 THROW(vmSymbols::java_lang_NullPointerException());
1434 }
1435
1436 // check if receiver klass implements the resolved interface
1437 if (!recv_klass->is_subtype_of(resolved_klass)) {
1438 ResourceMark rm(THREAD);
1439 char buf[200];
1440 jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s",
1441 recv_klass->external_name(),
1442 resolved_klass->external_name());
1443 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1444 }
1445
1446 methodHandle selected_method = resolved_method;
1447
1448 // resolve the method in the receiver class, unless it is private
1449 if (!resolved_method()->is_private()) {
1450 // do lookup based on receiver klass
1451 // This search must match the linktime preparation search for itable initialization
1452 // to correctly enforce loader constraints for interface method inheritance.
1453 // Private methods are skipped as the resolved method was not private.
1454 Method* method = lookup_instance_method_in_klasses(recv_klass,
1455 resolved_method->name(),
1456 resolved_method->signature(),
1457 Klass::skip_private, CHECK);
1458 selected_method = methodHandle(THREAD, method);
1459
1460 if (selected_method.is_null() && !check_null_and_abstract) {
1461 // In theory this is a harmless placeholder value, but
1462 // in practice leaving in null affects the nsk default method tests.
1463 // This needs further study.
1464 selected_method = resolved_method;
1465 }
1466 // check if method exists
1467 if (selected_method.is_null()) {
1468 // Pass arguments for generating a verbose error message.
1469 throw_abstract_method_error(resolved_method, recv_klass, CHECK);
1470 }
1471 // check access
1472 // Throw Illegal Access Error if selected_method is not public.
1473 if (!selected_method->is_public()) {
1474 ResourceMark rm(THREAD);
1475 stringStream ss;
1476 ss.print("'");
1477 Method::print_external_name(&ss, recv_klass, selected_method->name(), selected_method->signature());
1478 ss.print("'");
1479 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
1480 }
1481 // check if abstract
1482 if (check_null_and_abstract && selected_method->is_abstract()) {
1483 throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK);
1484 }
1485 }
1486
1487 if (log_develop_is_enabled(Trace, itables)) {
1488 trace_method_resolution("invokeinterface selected method: receiver-class:",
1489 recv_klass, resolved_klass, selected_method(), true);
1490 }
1491 // setup result
1492 if (resolved_method->has_vtable_index()) {
1493 int vtable_index = resolved_method->vtable_index();
1494 log_develop_trace(itables)(" -- vtable index: %d", vtable_index);
1495 assert(vtable_index == selected_method->vtable_index(), "sanity check");
1496 result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK);
1497 } else if (resolved_method->has_itable_index()) {
1498 int itable_index = resolved_method()->itable_index();
1499 log_develop_trace(itables)(" -- itable index: %d", itable_index);
1500 result.set_interface(resolved_klass, recv_klass, resolved_method, selected_method, itable_index, CHECK);
1501 } else {
1502 int index = resolved_method->vtable_index();
1503 log_develop_trace(itables)(" -- non itable/vtable index: %d", index);
1504 assert(index == Method::nonvirtual_vtable_index, "Oops hit another case!");
1505 assert(resolved_method()->is_private() ||
1506 (resolved_method()->is_final() && resolved_method->method_holder() == SystemDictionary::Object_klass()),
1507 "Should only have non-virtual invokeinterface for private or final-Object methods!");
1508 assert(resolved_method()->can_be_statically_bound(), "Should only have non-virtual invokeinterface for statically bound methods!");
1509 // This sets up the nonvirtual form of "virtual" call (as needed for final and private methods)
1510 result.set_virtual(resolved_klass, resolved_klass, resolved_method, resolved_method, index, CHECK);
1511 }
1512 }
1513
1514
1515 Method* LinkResolver::linktime_resolve_interface_method_or_null(
1516 const LinkInfo& link_info) {
1517 EXCEPTION_MARK;
1518 Method* method_result = linktime_resolve_interface_method(link_info, THREAD);
1519 if (HAS_PENDING_EXCEPTION) {
1520 CLEAR_PENDING_EXCEPTION;
1521 return NULL;
1522 } else {
1523 return method_result;
1524 }
1525 }
1526
1527 Method* LinkResolver::linktime_resolve_virtual_method_or_null(
1528 const LinkInfo& link_info) {
1529 EXCEPTION_MARK;
1530 Method* method_result = linktime_resolve_virtual_method(link_info, THREAD);
1531 if (HAS_PENDING_EXCEPTION) {
1532 CLEAR_PENDING_EXCEPTION;
1533 return NULL;
1534 } else {
1535 return method_result;
1536 }
1537 }
1538
1539 Method* LinkResolver::resolve_virtual_call_or_null(
1540 Klass* receiver_klass,
1541 const LinkInfo& link_info) {
1542 EXCEPTION_MARK;
1543 CallInfo info;
1544 resolve_virtual_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1545 if (HAS_PENDING_EXCEPTION) {
1546 CLEAR_PENDING_EXCEPTION;
1547 return NULL;
1548 }
1549 return info.selected_method();
1550 }
1551
1552 Method* LinkResolver::resolve_interface_call_or_null(
1553 Klass* receiver_klass,
1554 const LinkInfo& link_info) {
1555 EXCEPTION_MARK;
1556 CallInfo info;
1557 resolve_interface_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1558 if (HAS_PENDING_EXCEPTION) {
1559 CLEAR_PENDING_EXCEPTION;
1560 return NULL;
1561 }
1562 return info.selected_method();
1563 }
1564
1565 int LinkResolver::resolve_virtual_vtable_index(Klass* receiver_klass,
1566 const LinkInfo& link_info) {
1567 EXCEPTION_MARK;
1568 CallInfo info;
1569 resolve_virtual_call(info, Handle(), receiver_klass, link_info,
1570 /*check_null_or_abstract*/false, THREAD);
1571 if (HAS_PENDING_EXCEPTION) {
1572 CLEAR_PENDING_EXCEPTION;
1573 return Method::invalid_vtable_index;
1574 }
1575 return info.vtable_index();
1576 }
1577
1578 Method* LinkResolver::resolve_static_call_or_null(const LinkInfo& link_info) {
1579 EXCEPTION_MARK;
1580 CallInfo info;
1581 resolve_static_call(info, link_info, /*initialize_class*/false, THREAD);
1582 if (HAS_PENDING_EXCEPTION) {
1583 CLEAR_PENDING_EXCEPTION;
1584 return NULL;
1585 }
1586 return info.selected_method();
1587 }
1588
1589 Method* LinkResolver::resolve_special_call_or_null(const LinkInfo& link_info) {
1590 EXCEPTION_MARK;
1591 CallInfo info;
1592 resolve_special_call(info, Handle(), link_info, THREAD);
1593 if (HAS_PENDING_EXCEPTION) {
1594 CLEAR_PENDING_EXCEPTION;
1595 return NULL;
1596 }
1597 return info.selected_method();
1598 }
1599
1600
1601
1602 //------------------------------------------------------------------------------------------------------------------------
1603 // ConstantPool entries
1604
1605 void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) {
1606 switch (byte) {
1607 case Bytecodes::_invokestatic : resolve_invokestatic (result, pool, index, CHECK); break;
1608 case Bytecodes::_invokespecial : resolve_invokespecial (result, recv, pool, index, CHECK); break;
1609 case Bytecodes::_invokevirtual : resolve_invokevirtual (result, recv, pool, index, CHECK); break;
1610 case Bytecodes::_invokehandle : resolve_invokehandle (result, pool, index, CHECK); break;
1611 case Bytecodes::_invokedynamic : resolve_invokedynamic (result, pool, index, CHECK); break;
1612 case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break;
1613 default : break;
1614 }
1615 return;
1616 }
1617
1618 void LinkResolver::resolve_invoke(CallInfo& result, Handle& recv,
1619 const methodHandle& attached_method,
1620 Bytecodes::Code byte, TRAPS) {
1621 Klass* defc = attached_method->method_holder();
1622 Symbol* name = attached_method->name();
1623 Symbol* type = attached_method->signature();
1624 LinkInfo link_info(defc, name, type);
1625 switch(byte) {
1626 case Bytecodes::_invokevirtual:
1627 resolve_virtual_call(result, recv, recv->klass(), link_info,
1628 /*check_null_and_abstract=*/true, CHECK);
1629 break;
1630 case Bytecodes::_invokeinterface:
1631 resolve_interface_call(result, recv, recv->klass(), link_info,
1632 /*check_null_and_abstract=*/true, CHECK);
1633 break;
1634 case Bytecodes::_invokestatic:
1635 resolve_static_call(result, link_info, /*initialize_class=*/false, CHECK);
1636 break;
1637 case Bytecodes::_invokespecial:
1638 resolve_special_call(result, recv, link_info, CHECK);
1639 break;
1640 default:
1641 fatal("bad call: %s", Bytecodes::name(byte));
1642 break;
1643 }
1644 }
1645
1646 void LinkResolver::resolve_invokestatic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1647 LinkInfo link_info(pool, index, CHECK);
1648 resolve_static_call(result, link_info, /*initialize_class*/true, CHECK);
1649 }
1650
1651
1652 void LinkResolver::resolve_invokespecial(CallInfo& result, Handle recv,
1653 const constantPoolHandle& pool, int index, TRAPS) {
1654 LinkInfo link_info(pool, index, CHECK);
1655 resolve_special_call(result, recv, link_info, CHECK);
1656 }
1657
1658
1659 void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv,
1660 const constantPoolHandle& pool, int index,
1661 TRAPS) {
1662
1663 LinkInfo link_info(pool, index, CHECK);
1664 Klass* recvrKlass = recv.is_null() ? (Klass*)NULL : recv->klass();
1665 resolve_virtual_call(result, recv, recvrKlass, link_info, /*check_null_or_abstract*/true, CHECK);
1666 }
1667
1668
1669 void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, TRAPS) {
1670 LinkInfo link_info(pool, index, CHECK);
1671 Klass* recvrKlass = recv.is_null() ? (Klass*)NULL : recv->klass();
1672 resolve_interface_call(result, recv, recvrKlass, link_info, true, CHECK);
1673 }
1674
1675
1676 void LinkResolver::resolve_invokehandle(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1677 // This guy is reached from InterpreterRuntime::resolve_invokehandle.
1678 LinkInfo link_info(pool, index, CHECK);
1679 if (TraceMethodHandles) {
1680 ResourceMark rm(THREAD);
1681 tty->print_cr("resolve_invokehandle %s %s", link_info.name()->as_C_string(),
1682 link_info.signature()->as_C_string());
1683 }
1684 resolve_handle_call(result, link_info, CHECK);
1685 }
1686
1687 void LinkResolver::resolve_handle_call(CallInfo& result,
1688 const LinkInfo& link_info,
1689 TRAPS) {
1690 // JSR 292: this must be an implicitly generated method MethodHandle.invokeExact(*...) or similar
1691 Klass* resolved_klass = link_info.resolved_klass();
1692 assert(resolved_klass == SystemDictionary::MethodHandle_klass() ||
1693 resolved_klass == SystemDictionary::VarHandle_klass(), "");
1694 assert(MethodHandles::is_signature_polymorphic_name(link_info.name()), "");
1695 Handle resolved_appendix;
1696 Method* resolved_method = lookup_polymorphic_method(link_info, &resolved_appendix, CHECK);
1697 result.set_handle(resolved_klass, methodHandle(THREAD, resolved_method), resolved_appendix, CHECK);
1698 }
1699
1700 void LinkResolver::resolve_invokedynamic(CallInfo& result, const constantPoolHandle& pool, int indy_index, TRAPS) {
1701 ConstantPoolCacheEntry* cpce = pool->invokedynamic_cp_cache_entry_at(indy_index);
1702 int pool_index = cpce->constant_pool_index();
1703
1704 // Resolve the bootstrap specifier (BSM + optional arguments).
1705 BootstrapInfo bootstrap_specifier(pool, pool_index, indy_index);
1706
1707 // Check if CallSite has been bound already or failed already, and short circuit:
1708 {
1709 bool is_done = bootstrap_specifier.resolve_previously_linked_invokedynamic(result, CHECK);
1710 if (is_done) return;
1711 }
1712
1713 // The initial step in Call Site Specifier Resolution is to resolve the symbolic
1714 // reference to a method handle which will be the bootstrap method for a dynamic
1715 // call site. If resolution for the java.lang.invoke.MethodHandle for the bootstrap
1716 // method fails, then a MethodHandleInError is stored at the corresponding bootstrap
1717 // method's CP index for the CONSTANT_MethodHandle_info. So, there is no need to
1718 // set the indy_rf flag since any subsequent invokedynamic instruction which shares
1719 // this bootstrap method will encounter the resolution of MethodHandleInError.
1720
1721 resolve_dynamic_call(result, bootstrap_specifier, CHECK);
1722
1723 if (TraceMethodHandles) {
1724 bootstrap_specifier.print_msg_on(tty, "resolve_invokedynamic");
1725 }
1726
1727 // The returned linkage result is provisional up to the moment
1728 // the interpreter or runtime performs a serialized check of
1729 // the relevant CPCE::f1 field. This is done by the caller
1730 // of this method, via CPCE::set_dynamic_call, which uses
1731 // an ObjectLocker to do the final serialization of updates
1732 // to CPCE state, including f1.
1733 }
1734
1735 void LinkResolver::resolve_dynamic_call(CallInfo& result,
1736 BootstrapInfo& bootstrap_specifier,
1737 TRAPS) {
1738 // JSR 292: this must resolve to an implicitly generated method
1739 // such as MH.linkToCallSite(*...) or some other call-site shape.
1740 // The appendix argument is likely to be a freshly-created CallSite.
1741 // It may also be a MethodHandle from an unwrapped ConstantCallSite,
1742 // or any other reference. The resolved_method as well as the appendix
1743 // are both recorded together via CallInfo::set_handle.
1744 SystemDictionary::invoke_bootstrap_method(bootstrap_specifier, THREAD);
1745 Exceptions::wrap_dynamic_exception(THREAD);
1746
1747 if (HAS_PENDING_EXCEPTION) {
1748 if (!PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1749 // Let any random low-level IE or SOE or OOME just bleed through.
1750 // Basically we pretend that the bootstrap method was never called,
1751 // if it fails this way: We neither record a successful linkage,
1752 // nor do we memorize a LE for posterity.
1753 return;
1754 }
1755 // JVMS 5.4.3 says: If an attempt by the Java Virtual Machine to resolve
1756 // a symbolic reference fails because an error is thrown that is an
1757 // instance of LinkageError (or a subclass), then subsequent attempts to
1758 // resolve the reference always fail with the same error that was thrown
1759 // as a result of the initial resolution attempt.
1760 bool recorded_res_status = bootstrap_specifier.save_and_throw_indy_exc(CHECK);
1761 if (!recorded_res_status) {
1762 // Another thread got here just before we did. So, either use the method
1763 // that it resolved or throw the LinkageError exception that it threw.
1764 bool is_done = bootstrap_specifier.resolve_previously_linked_invokedynamic(result, CHECK);
1765 if (is_done) return;
1766 }
1767 assert(bootstrap_specifier.invokedynamic_cp_cache_entry()->indy_resolution_failed(),
1768 "Resolution failure flag wasn't set");
1769 }
1770
1771 bootstrap_specifier.resolve_newly_linked_invokedynamic(result, CHECK);
1772 // Exceptions::wrap_dynamic_exception not used because
1773 // set_handle doesn't throw linkage errors
1774 }
1775
1776 // Selected method is abstract.
1777 void LinkResolver::throw_abstract_method_error(const methodHandle& resolved_method,
1778 const methodHandle& selected_method,
1779 Klass *recv_klass, TRAPS) {
1780 Klass *resolved_klass = resolved_method->method_holder();
1781 ResourceMark rm(THREAD);
1782 stringStream ss;
1783
1784 if (recv_klass != NULL) {
1785 ss.print("Receiver class %s does not define or inherit an "
1786 "implementation of the",
1787 recv_klass->external_name());
1788 } else {
1789 ss.print("Missing implementation of");
1790 }
1791
1792 assert(resolved_method.not_null(), "Sanity");
1793 ss.print(" resolved method '%s%s",
1794 resolved_method->is_abstract() ? "abstract " : "",
1795 resolved_method->is_private() ? "private " : "");
1796 resolved_method->signature()->print_as_signature_external_return_type(&ss);
1797 ss.print(" %s(", resolved_method->name()->as_C_string());
1798 resolved_method->signature()->print_as_signature_external_parameters(&ss);
1799 ss.print(")' of %s %s.",
1800 resolved_klass->external_kind(),
1801 resolved_klass->external_name());
1802
1803 if (selected_method.not_null() && !(resolved_method == selected_method)) {
1804 ss.print(" Selected method is '%s%s",
1805 selected_method->is_abstract() ? "abstract " : "",
1806 selected_method->is_private() ? "private " : "");
1807 selected_method->print_external_name(&ss);
1808 ss.print("'.");
1809 }
1810
1811 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1812 }