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_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK);
68 }
69
70
71 void CallInfo::set_interface(Klass* resolved_klass,
72 const methodHandle& resolved_method,
73 const methodHandle& selected_method,
74 int itable_index, TRAPS) {
75 // This is only called for interface methods. If the resolved_method
76 // comes from java/lang/Object, it can be the subject of a virtual call, so
77 // we should pick the vtable index from the resolved method.
78 // In that case, the caller must call set_virtual instead of set_interface.
79 assert(resolved_method->method_holder()->is_interface(), "");
80 assert(itable_index == resolved_method()->itable_index(), "");
81 set_common(resolved_klass, resolved_method, selected_method, CallInfo::itable_call, itable_index, CHECK);
82 }
83
84 void CallInfo::set_virtual(Klass* resolved_klass,
85 const methodHandle& resolved_method,
86 const methodHandle& selected_method,
87 int vtable_index, TRAPS) {
88 assert(vtable_index >= 0 || vtable_index == Method::nonvirtual_vtable_index, "valid index");
89 assert(vtable_index < 0 || !resolved_method->has_vtable_index() || vtable_index == resolved_method->vtable_index(), "");
90 CallKind kind = (vtable_index >= 0 && !resolved_method->can_be_statically_bound() ? CallInfo::vtable_call : CallInfo::direct_call);
91 set_common(resolved_klass, resolved_method, selected_method, kind, vtable_index, CHECK);
92 assert(!resolved_method->is_compiled_lambda_form(), "these must be handled via an invokehandle call");
93 }
94
95 void CallInfo::set_handle(const methodHandle& resolved_method,
96 Handle resolved_appendix, TRAPS) {
97 set_handle(SystemDictionary::MethodHandle_klass(), resolved_method, resolved_appendix, CHECK);
98 }
99
100 void CallInfo::set_handle(Klass* resolved_klass,
101 const methodHandle& resolved_method,
102 Handle resolved_appendix, TRAPS) {
103 guarantee(resolved_method.not_null(), "resolved method is null");
104 assert(resolved_method->intrinsic_id() == vmIntrinsics::_invokeBasic ||
105 resolved_method->is_compiled_lambda_form(),
106 "linkMethod must return one of these");
107 int vtable_index = Method::nonvirtual_vtable_index;
108 assert(!resolved_method->has_vtable_index(), "");
109 set_common(resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK);
110 _resolved_appendix = resolved_appendix;
111 }
112
113 void CallInfo::set_common(Klass* resolved_klass,
114 const methodHandle& resolved_method,
115 const methodHandle& selected_method,
116 CallKind kind,
117 int index,
118 TRAPS) {
119 assert(resolved_method->signature() == selected_method->signature(), "signatures must correspond");
120 _resolved_klass = resolved_klass;
121 _resolved_method = resolved_method;
122 _selected_method = selected_method;
123 _call_kind = kind;
124 _call_index = index;
125 _resolved_appendix = Handle();
126 DEBUG_ONLY(verify()); // verify before making side effects
127
128 CompilationPolicy::compile_if_required(selected_method, THREAD);
129 }
130
131 // utility query for unreflecting a method
132 CallInfo::CallInfo(Method* resolved_method, Klass* resolved_klass, TRAPS) {
133 Klass* resolved_method_holder = resolved_method->method_holder();
134 if (resolved_klass == NULL) { // 2nd argument defaults to holder of 1st
135 resolved_klass = resolved_method_holder;
136 }
137 _resolved_klass = resolved_klass;
138 _resolved_method = methodHandle(THREAD, resolved_method);
139 _selected_method = methodHandle(THREAD, resolved_method);
140 // classify:
141 CallKind kind = CallInfo::unknown_kind;
142 int index = resolved_method->vtable_index();
143 if (resolved_method->can_be_statically_bound()) {
144 kind = CallInfo::direct_call;
145 } else if (!resolved_method_holder->is_interface()) {
146 // Could be an Object method inherited into an interface, but still a vtable call.
147 kind = CallInfo::vtable_call;
148 } else if (!resolved_klass->is_interface()) {
149 // A default or miranda method. Compute the vtable index.
150 index = LinkResolver::vtable_index_of_interface_method(resolved_klass,
151 _resolved_method);
152 assert(index >= 0 , "we should have valid vtable index at this point");
153
154 kind = CallInfo::vtable_call;
155 } else if (resolved_method->has_vtable_index()) {
156 // Can occur if an interface redeclares a method of Object.
157
158 #ifdef ASSERT
159 // Ensure that this is really the case.
160 Klass* object_klass = SystemDictionary::Object_klass();
161 Method * object_resolved_method = object_klass->vtable().method_at(index);
162 assert(object_resolved_method->name() == resolved_method->name(),
163 "Object and interface method names should match at vtable index %d, %s != %s",
164 index, object_resolved_method->name()->as_C_string(), resolved_method->name()->as_C_string());
165 assert(object_resolved_method->signature() == resolved_method->signature(),
166 "Object and interface method signatures should match at vtable index %d, %s != %s",
167 index, object_resolved_method->signature()->as_C_string(), resolved_method->signature()->as_C_string());
168 #endif // ASSERT
169
170 kind = CallInfo::vtable_call;
171 } else {
172 // A regular interface call.
173 kind = CallInfo::itable_call;
174 index = resolved_method->itable_index();
175 }
176 assert(index == Method::nonvirtual_vtable_index || index >= 0, "bad index %d", index);
177 _call_kind = kind;
178 _call_index = index;
179 _resolved_appendix = Handle();
180 // Find or create a ResolvedMethod instance for this Method*
181 set_resolved_method_name(CHECK);
182
183 DEBUG_ONLY(verify());
184 }
185
186 void CallInfo::set_resolved_method_name(TRAPS) {
187 assert(_resolved_method() != NULL, "Should already have a Method*");
188 oop rmethod_name = java_lang_invoke_ResolvedMethodName::find_resolved_method(_resolved_method, CHECK);
189 _resolved_method_name = Handle(THREAD, rmethod_name);
190 }
191
192 #ifdef ASSERT
193 void CallInfo::verify() {
194 switch (call_kind()) { // the meaning and allowed value of index depends on kind
195 case CallInfo::direct_call:
196 if (_call_index == Method::nonvirtual_vtable_index) break;
197 // else fall through to check vtable index:
198 case CallInfo::vtable_call:
199 assert(resolved_klass()->verify_vtable_index(_call_index), "");
200 break;
201 case CallInfo::itable_call:
202 assert(resolved_method()->method_holder()->verify_itable_index(_call_index), "");
203 break;
204 case CallInfo::unknown_kind:
205 assert(call_kind() != CallInfo::unknown_kind, "CallInfo must be set");
206 break;
207 default:
208 fatal("Unexpected call kind %d", call_kind());
209 }
210 }
211 #endif // ASSERT
212
213 #ifndef PRODUCT
214 void CallInfo::print() {
215 ResourceMark rm;
216 const char* kindstr;
217 switch (_call_kind) {
218 case direct_call: kindstr = "direct"; break;
219 case vtable_call: kindstr = "vtable"; break;
220 case itable_call: kindstr = "itable"; break;
221 default : kindstr = "unknown"; break;
222 }
223 tty->print_cr("Call %s@%d %s", kindstr, _call_index,
224 _resolved_method.is_null() ? "(none)" : _resolved_method->name_and_sig_as_C_string());
225 }
226 #endif
227
228 //------------------------------------------------------------------------------------------------------------------------
229 // Implementation of LinkInfo
230
231 LinkInfo::LinkInfo(const constantPoolHandle& pool, int index, const methodHandle& current_method, TRAPS) {
232 // resolve klass
233 _resolved_klass = pool->klass_ref_at(index, CHECK);
234
235 // Get name, signature, and static klass
236 _name = pool->name_ref_at(index);
237 _signature = pool->signature_ref_at(index);
238 _tag = pool->tag_ref_at(index);
239 _current_klass = pool->pool_holder();
240 _current_method = current_method;
241
242 // Coming from the constant pool always checks access
243 _check_access = true;
244 }
245
246 LinkInfo::LinkInfo(const constantPoolHandle& pool, int index, TRAPS) {
247 // resolve klass
248 _resolved_klass = pool->klass_ref_at(index, CHECK);
249
250 // Get name, signature, and static klass
251 _name = pool->name_ref_at(index);
252 _signature = pool->signature_ref_at(index);
253 _tag = pool->tag_ref_at(index);
254 _current_klass = pool->pool_holder();
255 _current_method = methodHandle();
256
257 // Coming from the constant pool always checks access
258 _check_access = true;
259 }
260
261 #ifndef PRODUCT
262 void LinkInfo::print() {
263 ResourceMark rm;
264 tty->print_cr("Link resolved_klass=%s name=%s signature=%s current_klass=%s check_access=%s",
265 _resolved_klass->name()->as_C_string(),
266 _name->as_C_string(),
267 _signature->as_C_string(),
268 _current_klass == NULL ? "(none)" : _current_klass->name()->as_C_string(),
269 _check_access ? "true" : "false");
270 }
271 #endif // PRODUCT
272 //------------------------------------------------------------------------------------------------------------------------
273 // Klass resolution
274
275 void LinkResolver::check_klass_accessability(Klass* ref_klass, Klass* sel_klass,
276 bool fold_type_to_class, TRAPS) {
277 Klass* base_klass = sel_klass;
278 if (fold_type_to_class) {
279 if (sel_klass->is_objArray_klass()) {
280 base_klass = ObjArrayKlass::cast(sel_klass)->bottom_klass();
281 }
282 // The element type could be a typeArray - we only need the access
283 // check if it is a reference to another class.
284 if (!base_klass->is_instance_klass()) {
285 return; // no relevant check to do
286 }
287 }
288 Reflection::VerifyClassAccessResults vca_result =
289 Reflection::verify_class_access(ref_klass, InstanceKlass::cast(base_klass), true);
290 if (vca_result != Reflection::ACCESS_OK) {
291 ResourceMark rm(THREAD);
292 char* msg = Reflection::verify_class_access_msg(ref_klass,
293 InstanceKlass::cast(base_klass),
294 vca_result);
295 bool same_module = (base_klass->module() == ref_klass->module());
296 if (msg == NULL) {
297 Exceptions::fthrow(
298 THREAD_AND_LOCATION,
299 vmSymbols::java_lang_IllegalAccessError(),
300 "failed to access class %s from class %s (%s%s%s)",
301 base_klass->external_name(),
302 ref_klass->external_name(),
303 (same_module) ? base_klass->joint_in_module_of_loader(ref_klass) : base_klass->class_in_module_of_loader(),
304 (same_module) ? "" : "; ",
305 (same_module) ? "" : ref_klass->class_in_module_of_loader());
306 } else {
307 // Use module specific message returned by verify_class_access_msg().
308 Exceptions::fthrow(
309 THREAD_AND_LOCATION,
310 vmSymbols::java_lang_IllegalAccessError(),
311 "%s", msg);
312 }
313 }
314 }
315
316 //------------------------------------------------------------------------------------------------------------------------
317 // Method resolution
318 //
319 // According to JVM spec. $5.4.3c & $5.4.3d
320
321 // Look up method in klasses, including static methods
322 // Then look up local default methods
323 Method* LinkResolver::lookup_method_in_klasses(const LinkInfo& link_info,
324 bool checkpolymorphism,
325 bool in_imethod_resolve) {
326 NoSafepointVerifier nsv; // Method* returned may not be reclaimed
327
328 Klass* klass = link_info.resolved_klass();
329 Symbol* name = link_info.name();
330 Symbol* signature = link_info.signature();
331
332 // Ignore overpasses so statics can be found during resolution
333 Method* result = klass->uncached_lookup_method(name, signature, Klass::skip_overpass);
334
335 if (klass->is_array_klass()) {
336 // Only consider klass and super klass for arrays
337 return result;
338 }
339
340 InstanceKlass* ik = InstanceKlass::cast(klass);
341
342 // JDK 8, JVMS 5.4.3.4: Interface method resolution should
343 // ignore static and non-public methods of java.lang.Object,
344 // like clone, finalize, registerNatives.
345 if (in_imethod_resolve &&
346 result != NULL &&
347 ik->is_interface() &&
348 (result->is_static() || !result->is_public()) &&
349 result->method_holder() == SystemDictionary::Object_klass()) {
350 result = NULL;
351 }
352
353 // Before considering default methods, check for an overpass in the
354 // current class if a method has not been found.
355 if (result == NULL) {
356 result = ik->find_method(name, signature);
357 }
358
359 if (result == NULL) {
360 Array<Method*>* default_methods = ik->default_methods();
361 if (default_methods != NULL) {
362 result = InstanceKlass::find_method(default_methods, name, signature);
363 }
364 }
365
366 if (checkpolymorphism && result != NULL) {
367 vmIntrinsics::ID iid = result->intrinsic_id();
368 if (MethodHandles::is_signature_polymorphic(iid)) {
369 // Do not link directly to these. The VM must produce a synthetic one using lookup_polymorphic_method.
370 return NULL;
371 }
372 }
373 return result;
374 }
375
376 // returns first instance method
377 // Looks up method in classes, then looks up local default methods
378 Method* LinkResolver::lookup_instance_method_in_klasses(Klass* klass,
379 Symbol* name,
380 Symbol* signature,
381 Klass::PrivateLookupMode private_mode, TRAPS) {
382 Method* result = klass->uncached_lookup_method(name, signature, Klass::find_overpass, private_mode);
383
384 while (result != NULL && result->is_static() && result->method_holder()->super() != NULL) {
385 Klass* super_klass = result->method_holder()->super();
386 result = super_klass->uncached_lookup_method(name, signature, Klass::find_overpass, private_mode);
387 }
388
389 if (klass->is_array_klass()) {
390 // Only consider klass and super klass for arrays
391 return result;
392 }
393
394 if (result == NULL) {
395 Array<Method*>* default_methods = InstanceKlass::cast(klass)->default_methods();
396 if (default_methods != NULL) {
397 result = InstanceKlass::find_method(default_methods, name, signature);
398 assert(result == NULL || !result->is_static(), "static defaults not allowed");
399 }
400 }
401 return result;
402 }
403
404 int LinkResolver::vtable_index_of_interface_method(Klass* klass,
405 const methodHandle& resolved_method) {
406
407 int vtable_index = Method::invalid_vtable_index;
408 Symbol* name = resolved_method->name();
409 Symbol* signature = resolved_method->signature();
410 InstanceKlass* ik = InstanceKlass::cast(klass);
411
412 // First check in default method array
413 if (!resolved_method->is_abstract() && ik->default_methods() != NULL) {
414 int index = InstanceKlass::find_method_index(ik->default_methods(),
415 name, signature, Klass::find_overpass,
416 Klass::find_static, Klass::find_private);
417 if (index >= 0 ) {
418 vtable_index = ik->default_vtable_indices()->at(index);
419 }
420 }
421 if (vtable_index == Method::invalid_vtable_index) {
422 // get vtable_index for miranda methods
423 klassVtable vt = ik->vtable();
424 vtable_index = vt.index_of_miranda(name, signature);
425 }
426 return vtable_index;
427 }
428
429 Method* LinkResolver::lookup_method_in_interfaces(const LinkInfo& cp_info) {
430 InstanceKlass *ik = InstanceKlass::cast(cp_info.resolved_klass());
431
432 // Specify 'true' in order to skip default methods when searching the
433 // interfaces. Function lookup_method_in_klasses() already looked for
434 // the method in the default methods table.
435 return ik->lookup_method_in_all_interfaces(cp_info.name(), cp_info.signature(), Klass::skip_defaults);
436 }
437
438 Method* LinkResolver::lookup_polymorphic_method(const LinkInfo& link_info,
439 Handle *appendix_result_or_null,
440 TRAPS) {
441 Klass* klass = link_info.resolved_klass();
442 Symbol* name = link_info.name();
443 Symbol* full_signature = link_info.signature();
444
445 vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name);
446 if (TraceMethodHandles) {
447 ResourceMark rm(THREAD);
448 tty->print_cr("lookup_polymorphic_method iid=%s %s.%s%s",
449 vmIntrinsics::name_at(iid), klass->external_name(),
450 name->as_C_string(), full_signature->as_C_string());
451 }
452 if ((klass == SystemDictionary::MethodHandle_klass() ||
453 klass == SystemDictionary::VarHandle_klass()) &&
454 iid != vmIntrinsics::_none) {
455 if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) {
456 // Most of these do not need an up-call to Java to resolve, so can be done anywhere.
457 // Do not erase last argument type (MemberName) if it is a static linkTo method.
458 bool keep_last_arg = MethodHandles::is_signature_polymorphic_static(iid);
459 TempNewSymbol basic_signature =
460 MethodHandles::lookup_basic_type_signature(full_signature, keep_last_arg, CHECK_NULL);
461 if (TraceMethodHandles) {
462 ResourceMark rm(THREAD);
463 tty->print_cr("lookup_polymorphic_method %s %s => basic %s",
464 name->as_C_string(),
465 full_signature->as_C_string(),
466 basic_signature->as_C_string());
467 }
468 Method* result = SystemDictionary::find_method_handle_intrinsic(iid,
469 basic_signature,
470 CHECK_NULL);
471 if (result != NULL) {
472 assert(result->is_method_handle_intrinsic(), "MH.invokeBasic or MH.linkTo* intrinsic");
473 assert(result->intrinsic_id() != vmIntrinsics::_invokeGeneric, "wrong place to find this");
474 assert(basic_signature == result->signature(), "predict the result signature");
475 if (TraceMethodHandles) {
476 ttyLocker ttyl;
477 tty->print("lookup_polymorphic_method => intrinsic ");
478 result->print_on(tty);
479 }
480 }
481 return result;
482 } else if (iid == vmIntrinsics::_invokeGeneric
483 && THREAD->can_call_java()
484 && appendix_result_or_null != NULL) {
485 // This is a method with type-checking semantics.
486 // We will ask Java code to spin an adapter method for it.
487 if (!MethodHandles::enabled()) {
488 // Make sure the Java part of the runtime has been booted up.
489 Klass* natives = SystemDictionary::MethodHandleNatives_klass();
490 if (natives == NULL || InstanceKlass::cast(natives)->is_not_initialized()) {
491 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_invoke_MethodHandleNatives(),
492 Handle(),
493 Handle(),
494 true,
495 CHECK_NULL);
496 }
497 }
498
499 Handle appendix;
500 Handle method_type;
501 Method* result = SystemDictionary::find_method_handle_invoker(
502 klass,
503 name,
504 full_signature,
505 link_info.current_klass(),
506 &appendix,
507 CHECK_NULL);
508 if (TraceMethodHandles) {
509 ttyLocker ttyl;
510 tty->print("lookup_polymorphic_method => (via Java) ");
511 result->print_on(tty);
512 tty->print(" lookup_polymorphic_method => appendix = ");
513 if (appendix.is_null()) tty->print_cr("(none)");
514 else appendix->print_on(tty);
515 }
516 if (result != NULL) {
517 #ifdef ASSERT
518 ResourceMark rm(THREAD);
519
520 TempNewSymbol basic_signature =
521 MethodHandles::lookup_basic_type_signature(full_signature, CHECK_NULL);
522 int actual_size_of_params = result->size_of_parameters();
523 int expected_size_of_params = ArgumentSizeComputer(basic_signature).size();
524 // +1 for MethodHandle.this, +1 for trailing MethodType
525 if (!MethodHandles::is_signature_polymorphic_static(iid)) expected_size_of_params += 1;
526 if (appendix.not_null()) expected_size_of_params += 1;
527 if (actual_size_of_params != expected_size_of_params) {
528 tty->print_cr("*** basic_signature=%s", basic_signature->as_C_string());
529 tty->print_cr("*** result for %s: ", vmIntrinsics::name_at(iid));
530 result->print();
531 }
532 assert(actual_size_of_params == expected_size_of_params,
533 "%d != %d", actual_size_of_params, expected_size_of_params);
534 #endif //ASSERT
535
536 assert(appendix_result_or_null != NULL, "");
537 (*appendix_result_or_null) = appendix;
538 }
539 return result;
540 }
541 }
542 return NULL;
543 }
544
545 void LinkResolver::check_method_accessability(Klass* ref_klass,
546 Klass* resolved_klass,
547 Klass* sel_klass,
548 const methodHandle& sel_method,
549 TRAPS) {
550
551 AccessFlags flags = sel_method->access_flags();
552
553 // Special case: arrays always override "clone". JVMS 2.15.
554 // If the resolved klass is an array class, and the declaring class
555 // is java.lang.Object and the method is "clone", set the flags
556 // to public.
557 //
558 // We'll check for the method name first, as that's most likely
559 // to be false (so we'll short-circuit out of these tests).
560 if (sel_method->name() == vmSymbols::clone_name() &&
561 sel_klass == SystemDictionary::Object_klass() &&
562 resolved_klass->is_array_klass()) {
563 // We need to change "protected" to "public".
564 assert(flags.is_protected(), "clone not protected?");
565 jint new_flags = flags.as_int();
566 new_flags = new_flags & (~JVM_ACC_PROTECTED);
567 new_flags = new_flags | JVM_ACC_PUBLIC;
568 flags.set_flags(new_flags);
569 }
570 // assert(extra_arg_result_or_null != NULL, "must be able to return extra argument");
571
572 bool can_access = Reflection::verify_member_access(ref_klass,
573 resolved_klass,
574 sel_klass,
575 flags,
576 true, false, CHECK);
577 // Any existing exceptions that may have been thrown, for example LinkageErrors
578 // from nest-host resolution, have been allowed to propagate.
579 if (!can_access) {
580 ResourceMark rm(THREAD);
581 bool same_module = (sel_klass->module() == ref_klass->module());
582 Exceptions::fthrow(
583 THREAD_AND_LOCATION,
584 vmSymbols::java_lang_IllegalAccessError(),
585 "class %s tried to access %s%s%smethod '%s' (%s%s%s)",
586 ref_klass->external_name(),
587 sel_method->is_abstract() ? "abstract " : "",
588 sel_method->is_protected() ? "protected " : "",
589 sel_method->is_private() ? "private " : "",
590 sel_method->external_name(),
591 (same_module) ? ref_klass->joint_in_module_of_loader(sel_klass) : ref_klass->class_in_module_of_loader(),
592 (same_module) ? "" : "; ",
593 (same_module) ? "" : sel_klass->class_in_module_of_loader()
594 );
595 return;
596 }
597 }
598
599 Method* LinkResolver::resolve_method_statically(Bytecodes::Code code,
600 const constantPoolHandle& pool, int index, TRAPS) {
601 // This method is used only
602 // (1) in C2 from InlineTree::ok_to_inline (via ciMethod::check_call),
603 // and
604 // (2) in Bytecode_invoke::static_target
605 // It appears to fail when applied to an invokeinterface call site.
606 // FIXME: Remove this method and ciMethod::check_call; refactor to use the other LinkResolver entry points.
607 // resolve klass
608 if (code == Bytecodes::_invokedynamic) {
609 Klass* resolved_klass = SystemDictionary::MethodHandle_klass();
610 Symbol* method_name = vmSymbols::invoke_name();
611 Symbol* method_signature = pool->signature_ref_at(index);
612 Klass* current_klass = pool->pool_holder();
613 LinkInfo link_info(resolved_klass, method_name, method_signature, current_klass);
614 return resolve_method(link_info, code, THREAD);
615 }
616
617 LinkInfo link_info(pool, index, methodHandle(), CHECK_NULL);
618 Klass* resolved_klass = link_info.resolved_klass();
619
620 if (pool->has_preresolution()
621 || (resolved_klass == SystemDictionary::MethodHandle_klass() &&
622 MethodHandles::is_signature_polymorphic_name(resolved_klass, link_info.name()))) {
623 Method* result = ConstantPool::method_at_if_loaded(pool, index);
624 if (result != NULL) {
625 return result;
626 }
627 }
628
629 if (code == Bytecodes::_invokeinterface) {
630 return resolve_interface_method(link_info, code, THREAD);
631 } else if (code == Bytecodes::_invokevirtual) {
632 return resolve_method(link_info, code, THREAD);
633 } else if (!resolved_klass->is_interface()) {
634 return resolve_method(link_info, code, THREAD);
635 } else {
636 return resolve_interface_method(link_info, code, THREAD);
637 }
638 }
639
640 // Check and print a loader constraint violation message for method or interface method
641 void LinkResolver::check_method_loader_constraints(const LinkInfo& link_info,
642 const methodHandle& resolved_method,
643 const char* method_type, TRAPS) {
644 Handle current_loader(THREAD, link_info.current_klass()->class_loader());
645 Handle resolved_loader(THREAD, resolved_method->method_holder()->class_loader());
646
647 ResourceMark rm(THREAD);
648 Symbol* failed_type_symbol =
649 SystemDictionary::check_signature_loaders(link_info.signature(), current_loader,
650 resolved_loader, true, CHECK);
651 if (failed_type_symbol != NULL) {
652 Klass* current_class = link_info.current_klass();
653 ClassLoaderData* current_loader_data = current_class->class_loader_data();
654 assert(current_loader_data != NULL, "current class has no class loader data");
655 Klass* resolved_method_class = resolved_method->method_holder();
656 ClassLoaderData* target_loader_data = resolved_method_class->class_loader_data();
657 assert(target_loader_data != NULL, "resolved method's class has no class loader data");
658
659 stringStream ss;
660 ss.print("loader constraint violation: when resolving %s '", method_type);
661 Method::print_external_name(&ss, link_info.resolved_klass(), link_info.name(), link_info.signature());
662 ss.print("' the class loader %s of the current class, %s,"
663 " and the class loader %s for the method's defining class, %s, have"
664 " different Class objects for the type %s used in the signature (%s; %s)",
665 current_loader_data->loader_name_and_id(),
666 current_class->name()->as_C_string(),
667 target_loader_data->loader_name_and_id(),
668 resolved_method_class->name()->as_C_string(),
669 failed_type_symbol->as_C_string(),
670 current_class->class_in_module_of_loader(false, true),
671 resolved_method_class->class_in_module_of_loader(false, true));
672 THROW_MSG(vmSymbols::java_lang_LinkageError(), ss.as_string());
673 }
674 }
675
676 void LinkResolver::check_field_loader_constraints(Symbol* field, Symbol* sig,
677 Klass* current_klass,
678 Klass* sel_klass, TRAPS) {
679 Handle ref_loader(THREAD, current_klass->class_loader());
680 Handle sel_loader(THREAD, sel_klass->class_loader());
681
682 ResourceMark rm(THREAD); // needed for check_signature_loaders
683 Symbol* failed_type_symbol =
684 SystemDictionary::check_signature_loaders(sig,
685 ref_loader, sel_loader,
686 false,
687 CHECK);
688 if (failed_type_symbol != NULL) {
689 stringStream ss;
690 const char* failed_type_name = failed_type_symbol->as_klass_external_name();
691
692 ss.print("loader constraint violation: when resolving field \"%s\" of type %s, "
693 "the class loader %s of the current class, %s, "
694 "and the class loader %s for the field's defining %s, %s, "
695 "have different Class objects for type %s (%s; %s)",
696 field->as_C_string(),
697 failed_type_name,
698 current_klass->class_loader_data()->loader_name_and_id(),
699 current_klass->external_name(),
700 sel_klass->class_loader_data()->loader_name_and_id(),
701 sel_klass->external_kind(),
702 sel_klass->external_name(),
703 failed_type_name,
704 current_klass->class_in_module_of_loader(false, true),
705 sel_klass->class_in_module_of_loader(false, true));
706 THROW_MSG(vmSymbols::java_lang_LinkageError(), ss.as_string());
707 }
708 }
709
710 Method* LinkResolver::resolve_method(const LinkInfo& link_info,
711 Bytecodes::Code code, TRAPS) {
712
713 Handle nested_exception;
714 Klass* resolved_klass = link_info.resolved_klass();
715
716 // 1. For invokevirtual, cannot call an interface method
717 if (code == Bytecodes::_invokevirtual && resolved_klass->is_interface()) {
718 ResourceMark rm(THREAD);
719 char buf[200];
720 jio_snprintf(buf, sizeof(buf), "Found interface %s, but class was expected",
721 resolved_klass->external_name());
722 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
723 }
724
725 // 2. check constant pool tag for called method - must be JVM_CONSTANT_Methodref
726 if (!link_info.tag().is_invalid() && !link_info.tag().is_method()) {
727 ResourceMark rm(THREAD);
728 stringStream ss;
729 ss.print("Method '");
730 Method::print_external_name(&ss, link_info.resolved_klass(), link_info.name(), link_info.signature());
731 ss.print("' must be Methodref constant");
732 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
733 }
734
735 // 3. lookup method in resolved klass and its super klasses
736 methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, true, false));
737
738 // 4. lookup method in all the interfaces implemented by the resolved klass
739 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) { // not found in the class hierarchy
740 resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info));
741
742 if (resolved_method.is_null()) {
743 // JSR 292: see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc
744 Method* method = lookup_polymorphic_method(link_info, (Handle*)NULL, THREAD);
745 resolved_method = methodHandle(THREAD, method);
746 if (HAS_PENDING_EXCEPTION) {
747 nested_exception = Handle(THREAD, PENDING_EXCEPTION);
748 CLEAR_PENDING_EXCEPTION;
749 }
750 }
751 }
752
753 // 5. method lookup failed
754 if (resolved_method.is_null()) {
755 ResourceMark rm(THREAD);
756 stringStream ss;
757 ss.print("'");
758 Method::print_external_name(&ss, resolved_klass, link_info.name(), link_info.signature());
759 ss.print("'");
760 THROW_MSG_CAUSE_(vmSymbols::java_lang_NoSuchMethodError(),
761 ss.as_string(), nested_exception, NULL);
762 }
763
764 // 6. access checks, access checking may be turned off when calling from within the VM.
765 Klass* current_klass = link_info.current_klass();
766 if (link_info.check_access()) {
767 assert(current_klass != NULL , "current_klass should not be null");
768
769 // check if method can be accessed by the referring class
770 check_method_accessability(current_klass,
771 resolved_klass,
772 resolved_method->method_holder(),
773 resolved_method,
774 CHECK_NULL);
775
776 // check loader constraints
777 check_method_loader_constraints(link_info, resolved_method, "method", CHECK_NULL);
778 }
779
780 return resolved_method();
781 }
782
783 static void trace_method_resolution(const char* prefix,
784 Klass* klass,
785 Klass* resolved_klass,
786 Method* method,
787 bool logitables,
788 int index = -1) {
789 #ifndef PRODUCT
790 ResourceMark rm;
791 Log(itables) logi;
792 LogStream lsi(logi.trace());
793 Log(vtables) logv;
794 LogStream lsv(logv.trace());
795 outputStream* st;
796 if (logitables) {
797 st = &lsi;
798 } else {
799 st = &lsv;
800 }
801 st->print("%s%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ",
802 prefix,
803 (klass == NULL ? "<NULL>" : klass->internal_name()),
804 (resolved_klass == NULL ? "<NULL>" : resolved_klass->internal_name()),
805 Method::name_and_sig_as_C_string(resolved_klass,
806 method->name(),
807 method->signature()),
808 method->method_holder()->internal_name());
809 method->print_linkage_flags(st);
810 if (index != -1) {
811 st->print("vtable_index:%d", index);
812 }
813 st->cr();
814 #endif // PRODUCT
815 }
816
817 // Do linktime resolution of a method in the interface within the context of the specied bytecode.
818 Method* LinkResolver::resolve_interface_method(const LinkInfo& link_info, Bytecodes::Code code, TRAPS) {
819
820 Klass* resolved_klass = link_info.resolved_klass();
821
822 // check if klass is interface
823 if (!resolved_klass->is_interface()) {
824 ResourceMark rm(THREAD);
825 char buf[200];
826 jio_snprintf(buf, sizeof(buf), "Found class %s, but interface was expected", resolved_klass->external_name());
827 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
828 }
829
830 // check constant pool tag for called method - must be JVM_CONSTANT_InterfaceMethodref
831 if (!link_info.tag().is_invalid() && !link_info.tag().is_interface_method()) {
832 ResourceMark rm(THREAD);
833 stringStream ss;
834 ss.print("Method '");
835 Method::print_external_name(&ss, link_info.resolved_klass(), link_info.name(), link_info.signature());
836 ss.print("' must be InterfaceMethodref constant");
837 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
838 }
839
840 // lookup method in this interface or its super, java.lang.Object
841 // JDK8: also look for static methods
842 methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, false, true));
843
844 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) {
845 // lookup method in all the super-interfaces
846 resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info));
847 }
848
849 if (resolved_method.is_null()) {
850 // no method found
851 ResourceMark rm(THREAD);
852 stringStream ss;
853 ss.print("'");
854 Method::print_external_name(&ss, resolved_klass, link_info.name(), link_info.signature());
855 ss.print("'");
856 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), ss.as_string());
857 }
858
859 if (link_info.check_access()) {
860 // JDK8 adds non-public interface methods, and accessability check requirement
861 Klass* current_klass = link_info.current_klass();
862
863 assert(current_klass != NULL , "current_klass should not be null");
864
865 // check if method can be accessed by the referring class
866 check_method_accessability(current_klass,
867 resolved_klass,
868 resolved_method->method_holder(),
869 resolved_method,
870 CHECK_NULL);
871
872 check_method_loader_constraints(link_info, resolved_method, "interface method", CHECK_NULL);
873 }
874
875 if (code != Bytecodes::_invokestatic && resolved_method->is_static()) {
876 ResourceMark rm(THREAD);
877 stringStream ss;
878 ss.print("Expected instance not static method '");
879 Method::print_external_name(&ss, resolved_klass,
880 resolved_method->name(), resolved_method->signature());
881 ss.print("'");
882 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
883 }
884
885 if (log_develop_is_enabled(Trace, itables)) {
886 char buf[200];
887 jio_snprintf(buf, sizeof(buf), "%s resolved interface method: caller-class:",
888 Bytecodes::name(code));
889 trace_method_resolution(buf, link_info.current_klass(), resolved_klass, resolved_method(), true);
890 }
891
892 return resolved_method();
893 }
894
895 //------------------------------------------------------------------------------------------------------------------------
896 // Field resolution
897
898 void LinkResolver::check_field_accessability(Klass* ref_klass,
899 Klass* resolved_klass,
900 Klass* sel_klass,
901 const fieldDescriptor& fd,
902 TRAPS) {
903 bool can_access = Reflection::verify_member_access(ref_klass,
904 resolved_klass,
905 sel_klass,
906 fd.access_flags(),
907 true, false, CHECK);
908 // Any existing exceptions that may have been thrown, for example LinkageErrors
909 // from nest-host resolution, have been allowed to propagate.
910 if (!can_access) {
911 bool same_module = (sel_klass->module() == ref_klass->module());
912 ResourceMark rm(THREAD);
913 Exceptions::fthrow(
914 THREAD_AND_LOCATION,
915 vmSymbols::java_lang_IllegalAccessError(),
916 "class %s tried to access %s%sfield %s.%s (%s%s%s)",
917 ref_klass->external_name(),
918 fd.is_protected() ? "protected " : "",
919 fd.is_private() ? "private " : "",
920 sel_klass->external_name(),
921 fd.name()->as_C_string(),
922 (same_module) ? ref_klass->joint_in_module_of_loader(sel_klass) : ref_klass->class_in_module_of_loader(),
923 (same_module) ? "" : "; ",
924 (same_module) ? "" : sel_klass->class_in_module_of_loader()
925 );
926 return;
927 }
928 }
929
930 void LinkResolver::resolve_field_access(fieldDescriptor& fd, const constantPoolHandle& pool, int index, const methodHandle& method, Bytecodes::Code byte, TRAPS) {
931 LinkInfo link_info(pool, index, method, CHECK);
932 resolve_field(fd, link_info, byte, true, CHECK);
933 }
934
935 void LinkResolver::resolve_field(fieldDescriptor& fd,
936 const LinkInfo& link_info,
937 Bytecodes::Code byte, bool initialize_class,
938 TRAPS) {
939 assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic ||
940 byte == Bytecodes::_getfield || byte == Bytecodes::_putfield ||
941 byte == Bytecodes::_nofast_getfield || byte == Bytecodes::_nofast_putfield ||
942 (byte == Bytecodes::_nop && !link_info.check_access()), "bad field access bytecode");
943
944 bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic);
945 bool is_put = (byte == Bytecodes::_putfield || byte == Bytecodes::_putstatic || byte == Bytecodes::_nofast_putfield);
946 // Check if there's a resolved klass containing the field
947 Klass* resolved_klass = link_info.resolved_klass();
948 Symbol* field = link_info.name();
949 Symbol* sig = link_info.signature();
950
951 if (resolved_klass == NULL) {
952 ResourceMark rm(THREAD);
953 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
954 }
955
956 // Resolve instance field
957 Klass* sel_klass = resolved_klass->find_field(field, sig, &fd);
958 // check if field exists; i.e., if a klass containing the field def has been selected
959 if (sel_klass == NULL) {
960 ResourceMark rm(THREAD);
961 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
962 }
963
964 // Access checking may be turned off when calling from within the VM.
965 Klass* current_klass = link_info.current_klass();
966 if (link_info.check_access()) {
967
968 // check access
969 check_field_accessability(current_klass, resolved_klass, sel_klass, fd, CHECK);
970
971 // check for errors
972 if (is_static != fd.is_static()) {
973 ResourceMark rm(THREAD);
974 char msg[200];
975 jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string());
976 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg);
977 }
978
979 // A final field can be modified only
980 // (1) by methods declared in the class declaring the field and
981 // (2) by the <clinit> method (in case of a static field)
982 // or by the <init> method (in case of an instance field).
983 if (is_put && fd.access_flags().is_final()) {
984
985 if (sel_klass != current_klass) {
986 ResourceMark rm(THREAD);
987 stringStream ss;
988 ss.print("Update to %s final field %s.%s attempted from a different class (%s) than the field's declaring class",
989 is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(),
990 current_klass->external_name());
991 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
992 }
993
994 if (fd.constants()->pool_holder()->major_version() >= 53) {
995 Method* m = link_info.current_method();
996 assert(m != NULL, "information about the current method must be available for 'put' bytecodes");
997 bool is_initialized_static_final_update = (byte == Bytecodes::_putstatic &&
998 fd.is_static() &&
999 !m->is_static_initializer());
1000 bool is_initialized_instance_final_update = ((byte == Bytecodes::_putfield || byte == Bytecodes::_nofast_putfield) &&
1001 !fd.is_static() &&
1002 !m->is_object_initializer());
1003
1004 if (is_initialized_static_final_update || is_initialized_instance_final_update) {
1005 ResourceMark rm(THREAD);
1006 stringStream ss;
1007 ss.print("Update to %s final field %s.%s attempted from a different method (%s) than the initializer method %s ",
1008 is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(),
1009 m->name()->as_C_string(),
1010 is_static ? "<clinit>" : "<init>");
1011 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
1012 }
1013 }
1014 }
1015
1016 // initialize resolved_klass if necessary
1017 // note 1: the klass which declared the field must be initialized (i.e, sel_klass)
1018 // according to the newest JVM spec (5.5, p.170) - was bug (gri 7/28/99)
1019 //
1020 // note 2: we don't want to force initialization if we are just checking
1021 // if the field access is legal; e.g., during compilation
1022 if (is_static && initialize_class) {
1023 sel_klass->initialize(CHECK);
1024 }
1025 }
1026
1027 if ((sel_klass != current_klass) && (current_klass != NULL)) {
1028 check_field_loader_constraints(field, sig, current_klass, sel_klass, CHECK);
1029 }
1030
1031 // return information. note that the klass is set to the actual klass containing the
1032 // field, otherwise access of static fields in superclasses will not work.
1033 }
1034
1035
1036 //------------------------------------------------------------------------------------------------------------------------
1037 // Invoke resolution
1038 //
1039 // Naming conventions:
1040 //
1041 // resolved_method the specified method (i.e., static receiver specified via constant pool index)
1042 // sel_method the selected method (selected via run-time lookup; e.g., based on dynamic receiver class)
1043 // resolved_klass the specified klass (i.e., specified via constant pool index)
1044 // recv_klass the receiver klass
1045
1046
1047 void LinkResolver::resolve_static_call(CallInfo& result,
1048 const LinkInfo& link_info,
1049 bool initialize_class, TRAPS) {
1050 Method* resolved_method = linktime_resolve_static_method(link_info, CHECK);
1051
1052 // The resolved class can change as a result of this resolution.
1053 Klass* resolved_klass = resolved_method->method_holder();
1054
1055 // Initialize klass (this should only happen if everything is ok)
1056 if (initialize_class && resolved_klass->should_be_initialized()) {
1057 resolved_klass->initialize(CHECK);
1058 // Use updated LinkInfo to reresolve with resolved method holder
1059 LinkInfo new_info(resolved_klass, link_info.name(), link_info.signature(),
1060 link_info.current_klass(),
1061 link_info.check_access() ? LinkInfo::needs_access_check : LinkInfo::skip_access_check);
1062 resolved_method = linktime_resolve_static_method(new_info, CHECK);
1063 }
1064
1065 // setup result
1066 result.set_static(resolved_klass, methodHandle(THREAD, resolved_method), CHECK);
1067 }
1068
1069 // throws linktime exceptions
1070 Method* LinkResolver::linktime_resolve_static_method(const LinkInfo& link_info, TRAPS) {
1071
1072 Klass* resolved_klass = link_info.resolved_klass();
1073 Method* resolved_method;
1074 if (!resolved_klass->is_interface()) {
1075 resolved_method = resolve_method(link_info, Bytecodes::_invokestatic, CHECK_NULL);
1076 } else {
1077 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokestatic, CHECK_NULL);
1078 }
1079 assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier");
1080
1081 // check if static
1082 if (!resolved_method->is_static()) {
1083 ResourceMark rm(THREAD);
1084 stringStream ss;
1085 ss.print("Expected static method '");
1086 resolved_method->print_external_name(&ss);
1087 ss.print("'");
1088 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1089 }
1090 return resolved_method;
1091 }
1092
1093
1094 void LinkResolver::resolve_special_call(CallInfo& result,
1095 Handle recv,
1096 const LinkInfo& link_info,
1097 TRAPS) {
1098 Method* resolved_method = linktime_resolve_special_method(link_info, CHECK);
1099 runtime_resolve_special_method(result, link_info, methodHandle(THREAD, resolved_method), recv, CHECK);
1100 }
1101
1102 // throws linktime exceptions
1103 Method* LinkResolver::linktime_resolve_special_method(const LinkInfo& link_info, TRAPS) {
1104
1105 // Invokespecial is called for multiple special reasons:
1106 // <init>
1107 // local private method invocation, for classes and interfaces
1108 // superclass.method, which can also resolve to a default method
1109 // and the selected method is recalculated relative to the direct superclass
1110 // superinterface.method, which explicitly does not check shadowing
1111 Klass* resolved_klass = link_info.resolved_klass();
1112 Method* resolved_method;
1113
1114 if (!resolved_klass->is_interface()) {
1115 resolved_method = resolve_method(link_info, Bytecodes::_invokespecial, CHECK_NULL);
1116 } else {
1117 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokespecial, CHECK_NULL);
1118 }
1119
1120 // check if method name is <init>, that it is found in same klass as static type
1121 if (resolved_method->name() == vmSymbols::object_initializer_name() &&
1122 resolved_method->method_holder() != resolved_klass) {
1123 ResourceMark rm(THREAD);
1124 stringStream ss;
1125 ss.print("%s: method '", resolved_klass->external_name());
1126 resolved_method->signature()->print_as_signature_external_return_type(&ss);
1127 ss.print(" %s(", resolved_method->name()->as_C_string());
1128 resolved_method->signature()->print_as_signature_external_parameters(&ss);
1129 ss.print(")' not found");
1130 Exceptions::fthrow(
1131 THREAD_AND_LOCATION,
1132 vmSymbols::java_lang_NoSuchMethodError(),
1133 "%s", ss.as_string());
1134 return NULL;
1135 }
1136
1137 // ensure that invokespecial's interface method reference is in
1138 // a direct superinterface, not an indirect superinterface
1139 Klass* current_klass = link_info.current_klass();
1140 if (current_klass != NULL && resolved_klass->is_interface()) {
1141 InstanceKlass* ck = InstanceKlass::cast(current_klass);
1142 InstanceKlass *klass_to_check = !ck->is_unsafe_anonymous() ?
1143 ck :
1144 ck->unsafe_anonymous_host();
1145 // Disable verification for the dynamically-generated reflection bytecodes.
1146 bool is_reflect = klass_to_check->is_subclass_of(
1147 SystemDictionary::reflect_MagicAccessorImpl_klass());
1148
1149 if (!is_reflect &&
1150 !klass_to_check->is_same_or_direct_interface(resolved_klass)) {
1151 ResourceMark rm(THREAD);
1152 stringStream ss;
1153 ss.print("Interface method reference: '");
1154 resolved_method->print_external_name(&ss);
1155 ss.print("', is in an indirect superinterface of %s",
1156 current_klass->external_name());
1157 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1158 }
1159 }
1160
1161 // check if not static
1162 if (resolved_method->is_static()) {
1163 ResourceMark rm(THREAD);
1164 stringStream ss;
1165 ss.print("Expecting non-static method '");
1166 resolved_method->print_external_name(&ss);
1167 ss.print("'");
1168 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1169 }
1170
1171 if (log_develop_is_enabled(Trace, itables)) {
1172 trace_method_resolution("invokespecial resolved method: caller-class:",
1173 current_klass, resolved_klass, resolved_method, true);
1174 }
1175
1176 return resolved_method;
1177 }
1178
1179 // throws runtime exceptions
1180 void LinkResolver::runtime_resolve_special_method(CallInfo& result,
1181 const LinkInfo& link_info,
1182 const methodHandle& resolved_method,
1183 Handle recv, TRAPS) {
1184
1185 Klass* resolved_klass = link_info.resolved_klass();
1186
1187 // resolved method is selected method unless we have an old-style lookup
1188 // for a superclass method
1189 // Invokespecial for a superinterface, resolved method is selected method,
1190 // no checks for shadowing
1191 methodHandle sel_method(THREAD, resolved_method());
1192
1193 if (link_info.check_access() &&
1194 // check if the method is not <init>
1195 resolved_method->name() != vmSymbols::object_initializer_name()) {
1196
1197 Klass* current_klass = link_info.current_klass();
1198
1199 // Check if the class of the resolved_klass is a superclass
1200 // (not supertype in order to exclude interface classes) of the current class.
1201 // This check is not performed for super.invoke for interface methods
1202 // in super interfaces.
1203 if (current_klass->is_subclass_of(resolved_klass) &&
1204 current_klass != resolved_klass) {
1205 // Lookup super method
1206 Klass* super_klass = current_klass->super();
1207 Method* instance_method = lookup_instance_method_in_klasses(super_klass,
1208 resolved_method->name(),
1209 resolved_method->signature(),
1210 Klass::find_private, CHECK);
1211 sel_method = methodHandle(THREAD, instance_method);
1212
1213 // check if found
1214 if (sel_method.is_null()) {
1215 ResourceMark rm(THREAD);
1216 stringStream ss;
1217 ss.print("'");
1218 resolved_method->print_external_name(&ss);
1219 ss.print("'");
1220 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1221 // check loader constraints if found a different method
1222 } else if (sel_method() != resolved_method()) {
1223 check_method_loader_constraints(link_info, sel_method, "method", CHECK);
1224 }
1225 }
1226
1227 // Check that the class of objectref (the receiver) is the current class or interface,
1228 // or a subtype of the current class or interface (the sender), otherwise invokespecial
1229 // throws IllegalAccessError.
1230 // The verifier checks that the sender is a subtype of the class in the I/MR operand.
1231 // The verifier also checks that the receiver is a subtype of the sender, if the sender is
1232 // a class. If the sender is an interface, the check has to be performed at runtime.
1233 InstanceKlass* sender = InstanceKlass::cast(current_klass);
1234 sender = sender->is_unsafe_anonymous() ? sender->unsafe_anonymous_host() : sender;
1235 if (sender->is_interface() && recv.not_null()) {
1236 Klass* receiver_klass = recv->klass();
1237 if (!receiver_klass->is_subtype_of(sender)) {
1238 ResourceMark rm(THREAD);
1239 char buf[500];
1240 jio_snprintf(buf, sizeof(buf),
1241 "Receiver class %s must be the current class or a subtype of interface %s",
1242 receiver_klass->external_name(),
1243 sender->external_name());
1244 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), buf);
1245 }
1246 }
1247 }
1248
1249 // check if not static
1250 if (sel_method->is_static()) {
1251 ResourceMark rm(THREAD);
1252 stringStream ss;
1253 ss.print("Expecting non-static method '");
1254 resolved_method->print_external_name(&ss);
1255 ss.print("'");
1256 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1257 }
1258
1259 // check if abstract
1260 if (sel_method->is_abstract()) {
1261 ResourceMark rm(THREAD);
1262 stringStream ss;
1263 ss.print("'");
1264 Method::print_external_name(&ss, resolved_klass, sel_method->name(), sel_method->signature());
1265 ss.print("'");
1266 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1267 }
1268
1269 if (log_develop_is_enabled(Trace, itables)) {
1270 trace_method_resolution("invokespecial selected method: resolved-class:",
1271 resolved_klass, resolved_klass, sel_method(), true);
1272 }
1273
1274 // setup result
1275 result.set_static(resolved_klass, sel_method, CHECK);
1276 }
1277
1278 void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, Klass* receiver_klass,
1279 const LinkInfo& link_info,
1280 bool check_null_and_abstract, TRAPS) {
1281 Method* resolved_method = linktime_resolve_virtual_method(link_info, CHECK);
1282 runtime_resolve_virtual_method(result, methodHandle(THREAD, resolved_method),
1283 link_info.resolved_klass(),
1284 recv, receiver_klass,
1285 check_null_and_abstract, CHECK);
1286 }
1287
1288 // throws linktime exceptions
1289 Method* LinkResolver::linktime_resolve_virtual_method(const LinkInfo& link_info,
1290 TRAPS) {
1291 // normal method resolution
1292 Method* resolved_method = resolve_method(link_info, Bytecodes::_invokevirtual, CHECK_NULL);
1293
1294 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1295 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1296
1297 // check if private interface method
1298 Klass* resolved_klass = link_info.resolved_klass();
1299 Klass* current_klass = link_info.current_klass();
1300
1301 // This is impossible, if resolve_klass is an interface, we've thrown icce in resolve_method
1302 if (resolved_klass->is_interface() && resolved_method->is_private()) {
1303 ResourceMark rm(THREAD);
1304 stringStream ss;
1305 ss.print("private interface method requires invokespecial, not invokevirtual: method '");
1306 resolved_method->print_external_name(&ss);
1307 ss.print("', caller-class: %s",
1308 (current_klass == NULL ? "<null>" : current_klass->internal_name()));
1309 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1310 }
1311
1312 // check if not static
1313 if (resolved_method->is_static()) {
1314 ResourceMark rm(THREAD);
1315 stringStream ss;
1316 ss.print("Expecting non-static method '");
1317 resolved_method->print_external_name(&ss);
1318 ss.print("'");
1319 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1320 }
1321
1322 if (log_develop_is_enabled(Trace, vtables)) {
1323 trace_method_resolution("invokevirtual resolved method: caller-class:",
1324 current_klass, resolved_klass, resolved_method, false);
1325 }
1326
1327 return resolved_method;
1328 }
1329
1330 // throws runtime exceptions
1331 void LinkResolver::runtime_resolve_virtual_method(CallInfo& result,
1332 const methodHandle& resolved_method,
1333 Klass* resolved_klass,
1334 Handle recv,
1335 Klass* recv_klass,
1336 bool check_null_and_abstract,
1337 TRAPS) {
1338
1339 // setup default return values
1340 int vtable_index = Method::invalid_vtable_index;
1341 methodHandle selected_method;
1342
1343 // runtime method resolution
1344 if (check_null_and_abstract && recv.is_null()) { // check if receiver exists
1345 THROW(vmSymbols::java_lang_NullPointerException());
1346 }
1347
1348 // Virtual methods cannot be resolved before its klass has been linked, for otherwise the Method*'s
1349 // has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since
1350 // a missing receiver might result in a bogus lookup.
1351 assert(resolved_method->method_holder()->is_linked(), "must be linked");
1352
1353 // do lookup based on receiver klass using the vtable index
1354 if (resolved_method->method_holder()->is_interface()) { // default or miranda method
1355 vtable_index = vtable_index_of_interface_method(resolved_klass, resolved_method);
1356 assert(vtable_index >= 0 , "we should have valid vtable index at this point");
1357
1358 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1359 } else {
1360 // at this point we are sure that resolved_method is virtual and not
1361 // a default or miranda method; therefore, it must have a valid vtable index.
1362 assert(!resolved_method->has_itable_index(), "");
1363 vtable_index = resolved_method->vtable_index();
1364 // We could get a negative vtable_index of nonvirtual_vtable_index for private
1365 // methods, or for final methods. Private methods never appear in the vtable
1366 // and never override other methods. As an optimization, final methods are
1367 // never put in the vtable, unless they override an existing method.
1368 // So if we do get nonvirtual_vtable_index, it means the selected method is the
1369 // resolved method, and it can never be changed by an override.
1370 if (vtable_index == Method::nonvirtual_vtable_index) {
1371 assert(resolved_method->can_be_statically_bound(), "cannot override this method");
1372 selected_method = resolved_method;
1373 } else {
1374 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1375 }
1376 }
1377
1378 // check if method exists
1379 if (selected_method.is_null()) {
1380 throw_abstract_method_error(resolved_method, recv_klass, CHECK);
1381 }
1382
1383 // check if abstract
1384 if (check_null_and_abstract && selected_method->is_abstract()) {
1385 // Pass arguments for generating a verbose error message.
1386 throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK);
1387 }
1388
1389 if (log_develop_is_enabled(Trace, vtables)) {
1390 trace_method_resolution("invokevirtual selected method: receiver-class:",
1391 recv_klass, resolved_klass, selected_method(),
1392 false, vtable_index);
1393 }
1394 // setup result
1395 result.set_virtual(resolved_klass, resolved_method, selected_method, vtable_index, CHECK);
1396 }
1397
1398 void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, Klass* recv_klass,
1399 const LinkInfo& link_info,
1400 bool check_null_and_abstract, TRAPS) {
1401 // throws linktime exceptions
1402 Method* resolved_method = linktime_resolve_interface_method(link_info, CHECK);
1403 methodHandle mh(THREAD, resolved_method);
1404 runtime_resolve_interface_method(result, mh, link_info.resolved_klass(),
1405 recv, recv_klass, check_null_and_abstract, CHECK);
1406 }
1407
1408 Method* LinkResolver::linktime_resolve_interface_method(const LinkInfo& link_info,
1409 TRAPS) {
1410 // normal interface method resolution
1411 Method* resolved_method = resolve_interface_method(link_info, Bytecodes::_invokeinterface, CHECK_NULL);
1412 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1413 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1414
1415 return resolved_method;
1416 }
1417
1418 // throws runtime exceptions
1419 void LinkResolver::runtime_resolve_interface_method(CallInfo& result,
1420 const methodHandle& resolved_method,
1421 Klass* resolved_klass,
1422 Handle recv,
1423 Klass* recv_klass,
1424 bool check_null_and_abstract, TRAPS) {
1425
1426 // check if receiver exists
1427 if (check_null_and_abstract && recv.is_null()) {
1428 THROW(vmSymbols::java_lang_NullPointerException());
1429 }
1430
1431 // check if receiver klass implements the resolved interface
1432 if (!recv_klass->is_subtype_of(resolved_klass)) {
1433 ResourceMark rm(THREAD);
1434 char buf[200];
1435 jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s",
1436 recv_klass->external_name(),
1437 resolved_klass->external_name());
1438 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1439 }
1440
1441 methodHandle selected_method = resolved_method;
1442
1443 // resolve the method in the receiver class, unless it is private
1444 if (!resolved_method()->is_private()) {
1445 // do lookup based on receiver klass
1446 // This search must match the linktime preparation search for itable initialization
1447 // to correctly enforce loader constraints for interface method inheritance.
1448 // Private methods are skipped as the resolved method was not private.
1449 Method* method = lookup_instance_method_in_klasses(recv_klass,
1450 resolved_method->name(),
1451 resolved_method->signature(),
1452 Klass::skip_private, CHECK);
1453 selected_method = methodHandle(THREAD, method);
1454
1455 if (selected_method.is_null() && !check_null_and_abstract) {
1456 // In theory this is a harmless placeholder value, but
1457 // in practice leaving in null affects the nsk default method tests.
1458 // This needs further study.
1459 selected_method = resolved_method;
1460 }
1461 // check if method exists
1462 if (selected_method.is_null()) {
1463 // Pass arguments for generating a verbose error message.
1464 throw_abstract_method_error(resolved_method, recv_klass, CHECK);
1465 }
1466 // check access
1467 // Throw Illegal Access Error if selected_method is not public.
1468 if (!selected_method->is_public()) {
1469 ResourceMark rm(THREAD);
1470 stringStream ss;
1471 ss.print("'");
1472 Method::print_external_name(&ss, recv_klass, selected_method->name(), selected_method->signature());
1473 ss.print("'");
1474 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
1475 }
1476 // check if abstract
1477 if (check_null_and_abstract && selected_method->is_abstract()) {
1478 throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK);
1479 }
1480 }
1481
1482 if (log_develop_is_enabled(Trace, itables)) {
1483 trace_method_resolution("invokeinterface selected method: receiver-class:",
1484 recv_klass, resolved_klass, selected_method(), true);
1485 }
1486 // setup result
1487 if (resolved_method->has_vtable_index()) {
1488 int vtable_index = resolved_method->vtable_index();
1489 log_develop_trace(itables)(" -- vtable index: %d", vtable_index);
1490 assert(vtable_index == selected_method->vtable_index(), "sanity check");
1491 result.set_virtual(resolved_klass, resolved_method, selected_method, vtable_index, CHECK);
1492 } else if (resolved_method->has_itable_index()) {
1493 int itable_index = resolved_method()->itable_index();
1494 log_develop_trace(itables)(" -- itable index: %d", itable_index);
1495 result.set_interface(resolved_klass, resolved_method, selected_method, itable_index, CHECK);
1496 } else {
1497 int index = resolved_method->vtable_index();
1498 log_develop_trace(itables)(" -- non itable/vtable index: %d", index);
1499 assert(index == Method::nonvirtual_vtable_index, "Oops hit another case!");
1500 assert(resolved_method()->is_private() ||
1501 (resolved_method()->is_final() && resolved_method->method_holder() == SystemDictionary::Object_klass()),
1502 "Should only have non-virtual invokeinterface for private or final-Object methods!");
1503 assert(resolved_method()->can_be_statically_bound(), "Should only have non-virtual invokeinterface for statically bound methods!");
1504 // This sets up the nonvirtual form of "virtual" call (as needed for final and private methods)
1505 result.set_virtual(resolved_klass, resolved_method, resolved_method, index, CHECK);
1506 }
1507 }
1508
1509
1510 Method* LinkResolver::linktime_resolve_interface_method_or_null(
1511 const LinkInfo& link_info) {
1512 EXCEPTION_MARK;
1513 Method* method_result = linktime_resolve_interface_method(link_info, THREAD);
1514 if (HAS_PENDING_EXCEPTION) {
1515 CLEAR_PENDING_EXCEPTION;
1516 return NULL;
1517 } else {
1518 return method_result;
1519 }
1520 }
1521
1522 Method* LinkResolver::linktime_resolve_virtual_method_or_null(
1523 const LinkInfo& link_info) {
1524 EXCEPTION_MARK;
1525 Method* method_result = linktime_resolve_virtual_method(link_info, THREAD);
1526 if (HAS_PENDING_EXCEPTION) {
1527 CLEAR_PENDING_EXCEPTION;
1528 return NULL;
1529 } else {
1530 return method_result;
1531 }
1532 }
1533
1534 Method* LinkResolver::resolve_virtual_call_or_null(
1535 Klass* receiver_klass,
1536 const LinkInfo& link_info) {
1537 EXCEPTION_MARK;
1538 CallInfo info;
1539 resolve_virtual_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1540 if (HAS_PENDING_EXCEPTION) {
1541 CLEAR_PENDING_EXCEPTION;
1542 return NULL;
1543 }
1544 return info.selected_method();
1545 }
1546
1547 Method* LinkResolver::resolve_interface_call_or_null(
1548 Klass* receiver_klass,
1549 const LinkInfo& link_info) {
1550 EXCEPTION_MARK;
1551 CallInfo info;
1552 resolve_interface_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1553 if (HAS_PENDING_EXCEPTION) {
1554 CLEAR_PENDING_EXCEPTION;
1555 return NULL;
1556 }
1557 return info.selected_method();
1558 }
1559
1560 int LinkResolver::resolve_virtual_vtable_index(Klass* receiver_klass,
1561 const LinkInfo& link_info) {
1562 EXCEPTION_MARK;
1563 CallInfo info;
1564 resolve_virtual_call(info, Handle(), receiver_klass, link_info,
1565 /*check_null_or_abstract*/false, THREAD);
1566 if (HAS_PENDING_EXCEPTION) {
1567 CLEAR_PENDING_EXCEPTION;
1568 return Method::invalid_vtable_index;
1569 }
1570 return info.vtable_index();
1571 }
1572
1573 Method* LinkResolver::resolve_static_call_or_null(const LinkInfo& link_info) {
1574 EXCEPTION_MARK;
1575 CallInfo info;
1576 resolve_static_call(info, link_info, /*initialize_class*/false, THREAD);
1577 if (HAS_PENDING_EXCEPTION) {
1578 CLEAR_PENDING_EXCEPTION;
1579 return NULL;
1580 }
1581 return info.selected_method();
1582 }
1583
1584 Method* LinkResolver::resolve_special_call_or_null(const LinkInfo& link_info) {
1585 EXCEPTION_MARK;
1586 CallInfo info;
1587 resolve_special_call(info, Handle(), link_info, THREAD);
1588 if (HAS_PENDING_EXCEPTION) {
1589 CLEAR_PENDING_EXCEPTION;
1590 return NULL;
1591 }
1592 return info.selected_method();
1593 }
1594
1595
1596
1597 //------------------------------------------------------------------------------------------------------------------------
1598 // ConstantPool entries
1599
1600 void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) {
1601 switch (byte) {
1602 case Bytecodes::_invokestatic : resolve_invokestatic (result, pool, index, CHECK); break;
1603 case Bytecodes::_invokespecial : resolve_invokespecial (result, recv, pool, index, CHECK); break;
1604 case Bytecodes::_invokevirtual : resolve_invokevirtual (result, recv, pool, index, CHECK); break;
1605 case Bytecodes::_invokehandle : resolve_invokehandle (result, pool, index, CHECK); break;
1606 case Bytecodes::_invokedynamic : resolve_invokedynamic (result, pool, index, CHECK); break;
1607 case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break;
1608 default : break;
1609 }
1610 return;
1611 }
1612
1613 void LinkResolver::resolve_invoke(CallInfo& result, Handle& recv,
1614 const methodHandle& attached_method,
1615 Bytecodes::Code byte, TRAPS) {
1616 Klass* defc = attached_method->method_holder();
1617 Symbol* name = attached_method->name();
1618 Symbol* type = attached_method->signature();
1619 LinkInfo link_info(defc, name, type);
1620 switch(byte) {
1621 case Bytecodes::_invokevirtual:
1622 resolve_virtual_call(result, recv, recv->klass(), link_info,
1623 /*check_null_and_abstract=*/true, CHECK);
1624 break;
1625 case Bytecodes::_invokeinterface:
1626 resolve_interface_call(result, recv, recv->klass(), link_info,
1627 /*check_null_and_abstract=*/true, CHECK);
1628 break;
1629 case Bytecodes::_invokestatic:
1630 resolve_static_call(result, link_info, /*initialize_class=*/false, CHECK);
1631 break;
1632 case Bytecodes::_invokespecial:
1633 resolve_special_call(result, recv, link_info, CHECK);
1634 break;
1635 default:
1636 fatal("bad call: %s", Bytecodes::name(byte));
1637 break;
1638 }
1639 }
1640
1641 void LinkResolver::resolve_invokestatic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1642 LinkInfo link_info(pool, index, CHECK);
1643 resolve_static_call(result, link_info, /*initialize_class*/true, CHECK);
1644 }
1645
1646
1647 void LinkResolver::resolve_invokespecial(CallInfo& result, Handle recv,
1648 const constantPoolHandle& pool, int index, TRAPS) {
1649 LinkInfo link_info(pool, index, CHECK);
1650 resolve_special_call(result, recv, link_info, CHECK);
1651 }
1652
1653
1654 void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv,
1655 const constantPoolHandle& pool, int index,
1656 TRAPS) {
1657
1658 LinkInfo link_info(pool, index, CHECK);
1659 Klass* recvrKlass = recv.is_null() ? (Klass*)NULL : recv->klass();
1660 resolve_virtual_call(result, recv, recvrKlass, link_info, /*check_null_or_abstract*/true, CHECK);
1661 }
1662
1663
1664 void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, TRAPS) {
1665 LinkInfo link_info(pool, index, CHECK);
1666 Klass* recvrKlass = recv.is_null() ? (Klass*)NULL : recv->klass();
1667 resolve_interface_call(result, recv, recvrKlass, link_info, true, CHECK);
1668 }
1669
1670
1671 void LinkResolver::resolve_invokehandle(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1672 // This guy is reached from InterpreterRuntime::resolve_invokehandle.
1673 LinkInfo link_info(pool, index, CHECK);
1674 if (TraceMethodHandles) {
1675 ResourceMark rm(THREAD);
1676 tty->print_cr("resolve_invokehandle %s %s", link_info.name()->as_C_string(),
1677 link_info.signature()->as_C_string());
1678 }
1679 resolve_handle_call(result, link_info, CHECK);
1680 }
1681
1682 void LinkResolver::resolve_handle_call(CallInfo& result,
1683 const LinkInfo& link_info,
1684 TRAPS) {
1685 // JSR 292: this must be an implicitly generated method MethodHandle.invokeExact(*...) or similar
1686 Klass* resolved_klass = link_info.resolved_klass();
1687 assert(resolved_klass == SystemDictionary::MethodHandle_klass() ||
1688 resolved_klass == SystemDictionary::VarHandle_klass(), "");
1689 assert(MethodHandles::is_signature_polymorphic_name(link_info.name()), "");
1690 Handle resolved_appendix;
1691 Method* resolved_method = lookup_polymorphic_method(link_info, &resolved_appendix, CHECK);
1692 result.set_handle(resolved_klass, methodHandle(THREAD, resolved_method), resolved_appendix, CHECK);
1693 }
1694
1695 void LinkResolver::resolve_invokedynamic(CallInfo& result, const constantPoolHandle& pool, int indy_index, TRAPS) {
1696 ConstantPoolCacheEntry* cpce = pool->invokedynamic_cp_cache_entry_at(indy_index);
1697 int pool_index = cpce->constant_pool_index();
1698
1699 // Resolve the bootstrap specifier (BSM + optional arguments).
1700 BootstrapInfo bootstrap_specifier(pool, pool_index, indy_index);
1701
1702 // Check if CallSite has been bound already or failed already, and short circuit:
1703 {
1704 bool is_done = bootstrap_specifier.resolve_previously_linked_invokedynamic(result, CHECK);
1705 if (is_done) return;
1706 }
1707
1708 // The initial step in Call Site Specifier Resolution is to resolve the symbolic
1709 // reference to a method handle which will be the bootstrap method for a dynamic
1710 // call site. If resolution for the java.lang.invoke.MethodHandle for the bootstrap
1711 // method fails, then a MethodHandleInError is stored at the corresponding bootstrap
1712 // method's CP index for the CONSTANT_MethodHandle_info. So, there is no need to
1713 // set the indy_rf flag since any subsequent invokedynamic instruction which shares
1714 // this bootstrap method will encounter the resolution of MethodHandleInError.
1715
1716 resolve_dynamic_call(result, bootstrap_specifier, CHECK);
1717
1718 if (TraceMethodHandles) {
1719 bootstrap_specifier.print_msg_on(tty, "resolve_invokedynamic");
1720 }
1721
1722 // The returned linkage result is provisional up to the moment
1723 // the interpreter or runtime performs a serialized check of
1724 // the relevant CPCE::f1 field. This is done by the caller
1725 // of this method, via CPCE::set_dynamic_call, which uses
1726 // an ObjectLocker to do the final serialization of updates
1727 // to CPCE state, including f1.
1728 }
1729
1730 void LinkResolver::resolve_dynamic_call(CallInfo& result,
1731 BootstrapInfo& bootstrap_specifier,
1732 TRAPS) {
1733 // JSR 292: this must resolve to an implicitly generated method
1734 // such as MH.linkToCallSite(*...) or some other call-site shape.
1735 // The appendix argument is likely to be a freshly-created CallSite.
1736 // It may also be a MethodHandle from an unwrapped ConstantCallSite,
1737 // or any other reference. The resolved_method as well as the appendix
1738 // are both recorded together via CallInfo::set_handle.
1739 SystemDictionary::invoke_bootstrap_method(bootstrap_specifier, THREAD);
1740 Exceptions::wrap_dynamic_exception(THREAD);
1741
1742 if (HAS_PENDING_EXCEPTION) {
1743 if (!PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1744 // Let any random low-level IE or SOE or OOME just bleed through.
1745 // Basically we pretend that the bootstrap method was never called,
1746 // if it fails this way: We neither record a successful linkage,
1747 // nor do we memorize a LE for posterity.
1748 return;
1749 }
1750 // JVMS 5.4.3 says: If an attempt by the Java Virtual Machine to resolve
1751 // a symbolic reference fails because an error is thrown that is an
1752 // instance of LinkageError (or a subclass), then subsequent attempts to
1753 // resolve the reference always fail with the same error that was thrown
1754 // as a result of the initial resolution attempt.
1755 bool recorded_res_status = bootstrap_specifier.save_and_throw_indy_exc(CHECK);
1756 if (!recorded_res_status) {
1757 // Another thread got here just before we did. So, either use the method
1758 // that it resolved or throw the LinkageError exception that it threw.
1759 bool is_done = bootstrap_specifier.resolve_previously_linked_invokedynamic(result, CHECK);
1760 if (is_done) return;
1761 }
1762 assert(bootstrap_specifier.invokedynamic_cp_cache_entry()->indy_resolution_failed(),
1763 "Resolution failure flag wasn't set");
1764 }
1765
1766 bootstrap_specifier.resolve_newly_linked_invokedynamic(result, CHECK);
1767 // Exceptions::wrap_dynamic_exception not used because
1768 // set_handle doesn't throw linkage errors
1769 }
1770
1771 // Selected method is abstract.
1772 void LinkResolver::throw_abstract_method_error(const methodHandle& resolved_method,
1773 const methodHandle& selected_method,
1774 Klass *recv_klass, TRAPS) {
1775 Klass *resolved_klass = resolved_method->method_holder();
1776 ResourceMark rm(THREAD);
1777 stringStream ss;
1778
1779 if (recv_klass != NULL) {
1780 ss.print("Receiver class %s does not define or inherit an "
1781 "implementation of the",
1782 recv_klass->external_name());
1783 } else {
1784 ss.print("Missing implementation of");
1785 }
1786
1787 assert(resolved_method.not_null(), "Sanity");
1788 ss.print(" resolved method '%s%s",
1789 resolved_method->is_abstract() ? "abstract " : "",
1790 resolved_method->is_private() ? "private " : "");
1791 resolved_method->signature()->print_as_signature_external_return_type(&ss);
1792 ss.print(" %s(", resolved_method->name()->as_C_string());
1793 resolved_method->signature()->print_as_signature_external_parameters(&ss);
1794 ss.print(")' of %s %s.",
1795 resolved_klass->external_kind(),
1796 resolved_klass->external_name());
1797
1798 if (selected_method.not_null() && !(resolved_method == selected_method)) {
1799 ss.print(" Selected method is '%s%s",
1800 selected_method->is_abstract() ? "abstract " : "",
1801 selected_method->is_private() ? "private " : "");
1802 selected_method->print_external_name(&ss);
1803 ss.print("'.");
1804 }
1805
1806 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1807 }