1 /*
2 * Copyright (c) 1997, 2018, 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/compileBroker.hpp"
34 #include "gc/shared/collectedHeap.inline.hpp"
35 #include "interpreter/bytecode.hpp"
36 #include "interpreter/interpreterRuntime.hpp"
37 #include "interpreter/linkResolver.hpp"
38 #include "logging/log.hpp"
39 #include "logging/logStream.hpp"
40 #include "memory/resourceArea.hpp"
41 #include "memory/universe.hpp"
42 #include "oops/cpCache.inline.hpp"
43 #include "oops/instanceKlass.hpp"
44 #include "oops/method.hpp"
45 #include "oops/objArrayKlass.hpp"
46 #include "oops/objArrayOop.hpp"
47 #include "oops/oop.inline.hpp"
48 #include "prims/methodHandles.hpp"
49 #include "prims/nativeLookup.hpp"
50 #include "runtime/compilationPolicy.hpp"
51 #include "runtime/fieldDescriptor.hpp"
52 #include "runtime/frame.inline.hpp"
53 #include "runtime/handles.inline.hpp"
54 #include "runtime/reflection.hpp"
55 #include "runtime/safepointVerifiers.hpp"
56 #include "runtime/signature.hpp"
57 #include "runtime/thread.inline.hpp"
58 #include "runtime/vmThread.hpp"
59
60 //------------------------------------------------------------------------------------------------------------------------
61 // Implementation of CallInfo
62
63
64 void CallInfo::set_static(Klass* resolved_klass, const methodHandle& resolved_method, TRAPS) {
65 int vtable_index = Method::nonvirtual_vtable_index;
66 set_common(resolved_klass, resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK);
67 }
68
69
70 void CallInfo::set_interface(Klass* resolved_klass,
71 Klass* selected_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, selected_klass, resolved_method, selected_method, CallInfo::itable_call, itable_index, CHECK);
82 }
83
84 void CallInfo::set_virtual(Klass* resolved_klass,
85 Klass* selected_klass,
86 const methodHandle& resolved_method,
87 const methodHandle& selected_method,
88 int vtable_index, TRAPS) {
89 assert(vtable_index >= 0 || vtable_index == Method::nonvirtual_vtable_index, "valid index");
90 assert(vtable_index < 0 || !resolved_method->has_vtable_index() || vtable_index == resolved_method->vtable_index(), "");
91 CallKind kind = (vtable_index >= 0 && !resolved_method->can_be_statically_bound() ? CallInfo::vtable_call : CallInfo::direct_call);
92 set_common(resolved_klass, selected_klass, resolved_method, selected_method, kind, vtable_index, CHECK);
93 assert(!resolved_method->is_compiled_lambda_form(), "these must be handled via an invokehandle call");
94 }
95
96 void CallInfo::set_handle(const methodHandle& resolved_method,
97 Handle resolved_appendix,
98 Handle resolved_method_type, TRAPS) {
99 set_handle(SystemDictionary::MethodHandle_klass(), resolved_method, resolved_appendix, resolved_method_type, CHECK);
100 }
101
102 void CallInfo::set_handle(Klass* resolved_klass,
103 const methodHandle& resolved_method,
104 Handle resolved_appendix,
105 Handle resolved_method_type, TRAPS) {
106 if (resolved_method.is_null()) {
107 THROW_MSG(vmSymbols::java_lang_InternalError(), "resolved method is null");
108 }
109 assert(resolved_method->intrinsic_id() == vmIntrinsics::_invokeBasic ||
110 resolved_method->is_compiled_lambda_form(),
111 "linkMethod must return one of these");
112 int vtable_index = Method::nonvirtual_vtable_index;
113 assert(!resolved_method->has_vtable_index(), "");
114 set_common(resolved_klass, resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK);
115 _resolved_appendix = resolved_appendix;
116 _resolved_method_type = resolved_method_type;
117 }
118
119 void CallInfo::set_common(Klass* resolved_klass,
120 Klass* selected_klass,
121 const methodHandle& resolved_method,
122 const methodHandle& selected_method,
123 CallKind kind,
124 int index,
125 TRAPS) {
126 assert(resolved_method->signature() == selected_method->signature(), "signatures must correspond");
127 _resolved_klass = resolved_klass;
128 _selected_klass = selected_klass;
129 _resolved_method = resolved_method;
130 _selected_method = selected_method;
131 _call_kind = kind;
132 _call_index = index;
133 _resolved_appendix = Handle();
134 DEBUG_ONLY(verify()); // verify before making side effects
135
136 CompilationPolicy::compile_if_required(selected_method, THREAD);
137 }
138
139 // utility query for unreflecting a method
140 CallInfo::CallInfo(Method* resolved_method, Klass* resolved_klass, TRAPS) {
141 Klass* resolved_method_holder = resolved_method->method_holder();
142 if (resolved_klass == NULL) { // 2nd argument defaults to holder of 1st
143 resolved_klass = resolved_method_holder;
144 }
145 _resolved_klass = resolved_klass;
146 _selected_klass = resolved_klass;
147 _resolved_method = resolved_method;
148 _selected_method = resolved_method;
149 // classify:
150 CallKind kind = CallInfo::unknown_kind;
151 int index = resolved_method->vtable_index();
152 if (resolved_method->can_be_statically_bound()) {
153 kind = CallInfo::direct_call;
154 } else if (!resolved_method_holder->is_interface()) {
155 // Could be an Object method inherited into an interface, but still a vtable call.
156 kind = CallInfo::vtable_call;
157 } else if (!resolved_klass->is_interface()) {
158 // A default or miranda method. Compute the vtable index.
159 index = LinkResolver::vtable_index_of_interface_method(resolved_klass,
160 resolved_method);
161 assert(index >= 0 , "we should have valid vtable index at this point");
162
163 kind = CallInfo::vtable_call;
164 } else if (resolved_method->has_vtable_index()) {
165 // Can occur if an interface redeclares a method of Object.
166
167 #ifdef ASSERT
168 // Ensure that this is really the case.
169 Klass* object_klass = SystemDictionary::Object_klass();
170 Method * object_resolved_method = object_klass->vtable().method_at(index);
171 assert(object_resolved_method->name() == resolved_method->name(),
172 "Object and interface method names should match at vtable index %d, %s != %s",
173 index, object_resolved_method->name()->as_C_string(), resolved_method->name()->as_C_string());
174 assert(object_resolved_method->signature() == resolved_method->signature(),
175 "Object and interface method signatures should match at vtable index %d, %s != %s",
176 index, object_resolved_method->signature()->as_C_string(), resolved_method->signature()->as_C_string());
177 #endif // ASSERT
178
179 kind = CallInfo::vtable_call;
180 } else {
181 // A regular interface call.
182 kind = CallInfo::itable_call;
183 index = resolved_method->itable_index();
184 }
185 assert(index == Method::nonvirtual_vtable_index || index >= 0, "bad index %d", index);
186 _call_kind = kind;
187 _call_index = index;
188 _resolved_appendix = Handle();
189 // Find or create a ResolvedMethod instance for this Method*
190 set_resolved_method_name(CHECK);
191
192 DEBUG_ONLY(verify());
193 }
194
195 void CallInfo::set_resolved_method_name(TRAPS) {
196 Method* m = _resolved_method();
197 assert(m != NULL, "Should already have a Method*");
198 oop rmethod_name = java_lang_invoke_ResolvedMethodName::find_resolved_method(m, CHECK);
199 _resolved_method_name = Handle(THREAD, rmethod_name);
200 }
201
202 #ifdef ASSERT
203 void CallInfo::verify() {
204 switch (call_kind()) { // the meaning and allowed value of index depends on kind
205 case CallInfo::direct_call:
206 if (_call_index == Method::nonvirtual_vtable_index) break;
207 // else fall through to check vtable index:
208 case CallInfo::vtable_call:
209 assert(resolved_klass()->verify_vtable_index(_call_index), "");
210 break;
211 case CallInfo::itable_call:
212 assert(resolved_method()->method_holder()->verify_itable_index(_call_index), "");
213 break;
214 case CallInfo::unknown_kind:
215 assert(call_kind() != CallInfo::unknown_kind, "CallInfo must be set");
216 break;
217 default:
218 fatal("Unexpected call kind %d", call_kind());
219 }
220 }
221 #endif //ASSERT
222
223 #ifndef PRODUCT
224 void CallInfo::print() {
225 ResourceMark rm;
226 const char* kindstr;
227 switch (_call_kind) {
228 case direct_call: kindstr = "direct"; break;
229 case vtable_call: kindstr = "vtable"; break;
230 case itable_call: kindstr = "itable"; break;
231 default : kindstr = "unknown"; break;
232 }
233 tty->print_cr("Call %s@%d %s", kindstr, _call_index,
234 _resolved_method.is_null() ? "(none)" : _resolved_method->name_and_sig_as_C_string());
235 }
236 #endif
237
238 //------------------------------------------------------------------------------------------------------------------------
239 // Implementation of LinkInfo
240
241 LinkInfo::LinkInfo(const constantPoolHandle& pool, int index, const methodHandle& current_method, TRAPS) {
242 // resolve klass
243 _resolved_klass = pool->klass_ref_at(index, CHECK);
244
245 // Get name, signature, and static klass
246 _name = pool->name_ref_at(index);
247 _signature = pool->signature_ref_at(index);
248 _tag = pool->tag_ref_at(index);
249 _current_klass = pool->pool_holder();
250 _current_method = current_method;
251
252 // Coming from the constant pool always checks access
253 _check_access = true;
254 }
255
256 LinkInfo::LinkInfo(const constantPoolHandle& pool, int index, TRAPS) {
257 // resolve klass
258 _resolved_klass = pool->klass_ref_at(index, CHECK);
259
260 // Get name, signature, and static klass
261 _name = pool->name_ref_at(index);
262 _signature = pool->signature_ref_at(index);
263 _tag = pool->tag_ref_at(index);
264 _current_klass = pool->pool_holder();
265 _current_method = methodHandle();
266
267 // Coming from the constant pool always checks access
268 _check_access = true;
269 }
270
271 char* LinkInfo::method_string() const {
272 return Method::name_and_sig_as_C_string(_resolved_klass, _name, _signature);
273 }
274
275 #ifndef PRODUCT
276 void LinkInfo::print() {
277 ResourceMark rm;
278 tty->print_cr("Link resolved_klass=%s name=%s signature=%s current_klass=%s check_access=%s",
279 _resolved_klass->name()->as_C_string(),
280 _name->as_C_string(),
281 _signature->as_C_string(),
282 _current_klass == NULL ? "(none)" : _current_klass->name()->as_C_string(),
283 _check_access ? "true" : "false");
284 }
285 #endif // PRODUCT
286 //------------------------------------------------------------------------------------------------------------------------
287 // Klass resolution
288
289 void LinkResolver::check_klass_accessability(Klass* ref_klass, Klass* sel_klass,
290 bool fold_type_to_class, TRAPS) {
291 Klass* base_klass = sel_klass;
292 if (fold_type_to_class) {
293 if (sel_klass->is_objArray_klass()) {
294 base_klass = ObjArrayKlass::cast(sel_klass)->bottom_klass();
295 }
296 // The element type could be a typeArray - we only need the access
297 // check if it is an reference to another class.
298 if (!base_klass->is_instance_klass()) {
299 return; // no relevant check to do
300 }
301 }
302 Reflection::VerifyClassAccessResults vca_result =
303 Reflection::verify_class_access(ref_klass, InstanceKlass::cast(base_klass), true);
304 if (vca_result != Reflection::ACCESS_OK) {
305 ResourceMark rm(THREAD);
306 char* msg = Reflection::verify_class_access_msg(ref_klass,
307 InstanceKlass::cast(base_klass),
308 vca_result);
309 if (msg == NULL) {
310 Exceptions::fthrow(
311 THREAD_AND_LOCATION,
312 vmSymbols::java_lang_IllegalAccessError(),
313 "failed to access class %s from class %s",
314 base_klass->external_name(),
315 ref_klass->external_name());
316 } else {
317 // Use module specific message returned by verify_class_access_msg().
318 Exceptions::fthrow(
319 THREAD_AND_LOCATION,
320 vmSymbols::java_lang_IllegalAccessError(),
321 "%s", msg);
322 }
323 }
324 }
325
326 //------------------------------------------------------------------------------------------------------------------------
327 // Method resolution
328 //
329 // According to JVM spec. $5.4.3c & $5.4.3d
330
331 // Look up method in klasses, including static methods
332 // Then look up local default methods
333 Method* LinkResolver::lookup_method_in_klasses(const LinkInfo& link_info,
334 bool checkpolymorphism,
335 bool in_imethod_resolve) {
336 NoSafepointVerifier nsv; // Method* returned may not be reclaimed
337
338 Klass* klass = link_info.resolved_klass();
339 Symbol* name = link_info.name();
340 Symbol* signature = link_info.signature();
341
342 // Ignore overpasses so statics can be found during resolution
343 Method* result = klass->uncached_lookup_method(name, signature, Klass::skip_overpass);
344
345 if (klass->is_array_klass()) {
346 // Only consider klass and super klass for arrays
347 return result;
348 }
349
350 InstanceKlass* ik = InstanceKlass::cast(klass);
351
352 // JDK 8, JVMS 5.4.3.4: Interface method resolution should
353 // ignore static and non-public methods of java.lang.Object,
354 // like clone, finalize, registerNatives.
355 if (in_imethod_resolve &&
356 result != NULL &&
357 ik->is_interface() &&
358 (result->is_static() || !result->is_public()) &&
359 result->method_holder() == SystemDictionary::Object_klass()) {
360 result = NULL;
361 }
362
363 // Before considering default methods, check for an overpass in the
364 // current class if a method has not been found.
365 if (result == NULL) {
366 result = ik->find_method(name, signature);
367 }
368
369 if (result == NULL) {
370 Array<Method*>* default_methods = ik->default_methods();
371 if (default_methods != NULL) {
372 result = InstanceKlass::find_method(default_methods, name, signature);
373 }
374 }
375
376 if (checkpolymorphism && result != NULL) {
377 vmIntrinsics::ID iid = result->intrinsic_id();
378 if (MethodHandles::is_signature_polymorphic(iid)) {
379 // Do not link directly to these. The VM must produce a synthetic one using lookup_polymorphic_method.
380 return NULL;
381 }
382 }
383 return result;
384 }
385
386 // returns first instance method
387 // Looks up method in classes, then looks up local default methods
388 methodHandle LinkResolver::lookup_instance_method_in_klasses(Klass* klass,
389 Symbol* name,
390 Symbol* signature, TRAPS) {
391 Method* result = klass->uncached_lookup_method(name, signature, Klass::find_overpass);
392
393 while (result != NULL && result->is_static() && result->method_holder()->super() != NULL) {
394 Klass* super_klass = result->method_holder()->super();
395 result = super_klass->uncached_lookup_method(name, signature, Klass::find_overpass);
396 }
397
398 if (klass->is_array_klass()) {
399 // Only consider klass and super klass for arrays
400 return methodHandle(THREAD, result);
401 }
402
403 if (result == NULL) {
404 Array<Method*>* default_methods = InstanceKlass::cast(klass)->default_methods();
405 if (default_methods != NULL) {
406 result = InstanceKlass::find_method(default_methods, name, signature);
407 assert(result == NULL || !result->is_static(), "static defaults not allowed");
408 }
409 }
410 return methodHandle(THREAD, result);
411 }
412
413 int LinkResolver::vtable_index_of_interface_method(Klass* klass,
414 const methodHandle& resolved_method) {
415
416 int vtable_index = Method::invalid_vtable_index;
417 Symbol* name = resolved_method->name();
418 Symbol* signature = resolved_method->signature();
419 InstanceKlass* ik = InstanceKlass::cast(klass);
420
421 // First check in default method array
422 if (!resolved_method->is_abstract() && ik->default_methods() != NULL) {
423 int index = InstanceKlass::find_method_index(ik->default_methods(),
424 name, signature, Klass::find_overpass,
425 Klass::find_static, Klass::find_private);
426 if (index >= 0 ) {
427 vtable_index = ik->default_vtable_indices()->at(index);
428 }
429 }
430 if (vtable_index == Method::invalid_vtable_index) {
431 // get vtable_index for miranda methods
432 klassVtable vt = ik->vtable();
433 vtable_index = vt.index_of_miranda(name, signature);
434 }
435 return vtable_index;
436 }
437
438 Method* LinkResolver::lookup_method_in_interfaces(const LinkInfo& cp_info) {
439 InstanceKlass *ik = InstanceKlass::cast(cp_info.resolved_klass());
440
441 // Specify 'true' in order to skip default methods when searching the
442 // interfaces. Function lookup_method_in_klasses() already looked for
443 // the method in the default methods table.
444 return ik->lookup_method_in_all_interfaces(cp_info.name(), cp_info.signature(), Klass::skip_defaults);
445 }
446
447 methodHandle LinkResolver::lookup_polymorphic_method(
448 const LinkInfo& link_info,
449 Handle *appendix_result_or_null,
450 Handle *method_type_result,
451 TRAPS) {
452 Klass* klass = link_info.resolved_klass();
453 Symbol* name = link_info.name();
454 Symbol* full_signature = link_info.signature();
455
456 vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name);
457 if (TraceMethodHandles) {
458 ResourceMark rm(THREAD);
459 tty->print_cr("lookup_polymorphic_method iid=%s %s.%s%s",
460 vmIntrinsics::name_at(iid), klass->external_name(),
461 name->as_C_string(), full_signature->as_C_string());
462 }
463 if ((klass == SystemDictionary::MethodHandle_klass() ||
464 klass == SystemDictionary::VarHandle_klass()) &&
465 iid != vmIntrinsics::_none) {
466 if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) {
467 // Most of these do not need an up-call to Java to resolve, so can be done anywhere.
468 // Do not erase last argument type (MemberName) if it is a static linkTo method.
469 bool keep_last_arg = MethodHandles::is_signature_polymorphic_static(iid);
470 TempNewSymbol basic_signature =
471 MethodHandles::lookup_basic_type_signature(full_signature, keep_last_arg, CHECK_NULL);
472 if (TraceMethodHandles) {
473 ResourceMark rm(THREAD);
474 tty->print_cr("lookup_polymorphic_method %s %s => basic %s",
475 name->as_C_string(),
476 full_signature->as_C_string(),
477 basic_signature->as_C_string());
478 }
479 methodHandle result = SystemDictionary::find_method_handle_intrinsic(iid,
480 basic_signature,
481 CHECK_NULL);
482 if (result.not_null()) {
483 assert(result->is_method_handle_intrinsic(), "MH.invokeBasic or MH.linkTo* intrinsic");
484 assert(result->intrinsic_id() != vmIntrinsics::_invokeGeneric, "wrong place to find this");
485 assert(basic_signature == result->signature(), "predict the result signature");
486 if (TraceMethodHandles) {
487 ttyLocker ttyl;
488 tty->print("lookup_polymorphic_method => intrinsic ");
489 result->print_on(tty);
490 }
491 }
492 return result;
493 } else if (iid == vmIntrinsics::_invokeGeneric
494 && THREAD->can_call_java()
495 && appendix_result_or_null != NULL) {
496 // This is a method with type-checking semantics.
497 // We will ask Java code to spin an adapter method for it.
498 if (!MethodHandles::enabled()) {
499 // Make sure the Java part of the runtime has been booted up.
500 Klass* natives = SystemDictionary::MethodHandleNatives_klass();
501 if (natives == NULL || InstanceKlass::cast(natives)->is_not_initialized()) {
502 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_invoke_MethodHandleNatives(),
503 Handle(),
504 Handle(),
505 true,
506 CHECK_NULL);
507 }
508 }
509
510 Handle appendix;
511 Handle method_type;
512 methodHandle result = SystemDictionary::find_method_handle_invoker(
513 klass,
514 name,
515 full_signature,
516 link_info.current_klass(),
517 &appendix,
518 &method_type,
519 CHECK_NULL);
520 if (TraceMethodHandles) {
521 ttyLocker ttyl;
522 tty->print("lookup_polymorphic_method => (via Java) ");
523 result->print_on(tty);
524 tty->print(" lookup_polymorphic_method => appendix = ");
525 if (appendix.is_null()) tty->print_cr("(none)");
526 else appendix->print_on(tty);
527 }
528 if (result.not_null()) {
529 #ifdef ASSERT
530 ResourceMark rm(THREAD);
531
532 TempNewSymbol basic_signature =
533 MethodHandles::lookup_basic_type_signature(full_signature, CHECK_NULL);
534 int actual_size_of_params = result->size_of_parameters();
535 int expected_size_of_params = ArgumentSizeComputer(basic_signature).size();
536 // +1 for MethodHandle.this, +1 for trailing MethodType
537 if (!MethodHandles::is_signature_polymorphic_static(iid)) expected_size_of_params += 1;
538 if (appendix.not_null()) expected_size_of_params += 1;
539 if (actual_size_of_params != expected_size_of_params) {
540 tty->print_cr("*** basic_signature=%s", basic_signature->as_C_string());
541 tty->print_cr("*** result for %s: ", vmIntrinsics::name_at(iid));
542 result->print();
543 }
544 assert(actual_size_of_params == expected_size_of_params,
545 "%d != %d", actual_size_of_params, expected_size_of_params);
546 #endif //ASSERT
547
548 assert(appendix_result_or_null != NULL, "");
549 (*appendix_result_or_null) = appendix;
550 (*method_type_result) = method_type;
551 }
552 return result;
553 }
554 }
555 return NULL;
556 }
557
558 void LinkResolver::check_method_accessability(Klass* ref_klass,
559 Klass* resolved_klass,
560 Klass* sel_klass,
561 const methodHandle& sel_method,
562 TRAPS) {
563
564 AccessFlags flags = sel_method->access_flags();
565
566 // Special case: arrays always override "clone". JVMS 2.15.
567 // If the resolved klass is an array class, and the declaring class
568 // is java.lang.Object and the method is "clone", set the flags
569 // to public.
570 //
571 // We'll check for the method name first, as that's most likely
572 // to be false (so we'll short-circuit out of these tests).
573 if (sel_method->name() == vmSymbols::clone_name() &&
574 sel_klass == SystemDictionary::Object_klass() &&
575 resolved_klass->is_array_klass()) {
576 // We need to change "protected" to "public".
577 assert(flags.is_protected(), "clone not protected?");
578 jint new_flags = flags.as_int();
579 new_flags = new_flags & (~JVM_ACC_PROTECTED);
580 new_flags = new_flags | JVM_ACC_PUBLIC;
581 flags.set_flags(new_flags);
582 }
583 // assert(extra_arg_result_or_null != NULL, "must be able to return extra argument");
584
585 if (!Reflection::verify_field_access(ref_klass,
586 resolved_klass,
587 sel_klass,
588 flags,
589 true)) {
590 ResourceMark rm(THREAD);
591 bool same_module = (sel_klass->module() == ref_klass->module());
592 Exceptions::fthrow(
593 THREAD_AND_LOCATION,
594 vmSymbols::java_lang_IllegalAccessError(),
595 "tried to access method %s.%s%s from class %s (%s%s%s)",
596 sel_klass->external_name(),
597 sel_method->name()->as_C_string(),
598 sel_method->signature()->as_C_string(),
599 ref_klass->external_name(),
600 (same_module) ? sel_klass->joint_in_module_of_loader(ref_klass) : sel_klass->class_in_module_of_loader(),
601 (same_module) ? "" : "; ",
602 (same_module) ? "" : ref_klass->class_in_module_of_loader()
603 );
604 return;
605 }
606 }
607
608 methodHandle LinkResolver::resolve_method_statically(Bytecodes::Code code,
609 const constantPoolHandle& pool, int index, TRAPS) {
610 // This method is used only
611 // (1) in C2 from InlineTree::ok_to_inline (via ciMethod::check_call),
612 // and
613 // (2) in Bytecode_invoke::static_target
614 // It appears to fail when applied to an invokeinterface call site.
615 // FIXME: Remove this method and ciMethod::check_call; refactor to use the other LinkResolver entry points.
616 // resolve klass
617 if (code == Bytecodes::_invokedynamic) {
618 Klass* resolved_klass = SystemDictionary::MethodHandle_klass();
619 Symbol* method_name = vmSymbols::invoke_name();
620 Symbol* method_signature = pool->signature_ref_at(index);
621 Klass* current_klass = pool->pool_holder();
622 LinkInfo link_info(resolved_klass, method_name, method_signature, current_klass);
623 return resolve_method(link_info, code, THREAD);
624 }
625
626 LinkInfo link_info(pool, index, methodHandle(), CHECK_NULL);
627 Klass* resolved_klass = link_info.resolved_klass();
628
629 if (pool->has_preresolution()
630 || (resolved_klass == SystemDictionary::MethodHandle_klass() &&
631 MethodHandles::is_signature_polymorphic_name(resolved_klass, link_info.name()))) {
632 Method* result = ConstantPool::method_at_if_loaded(pool, index);
633 if (result != NULL) {
634 return methodHandle(THREAD, result);
635 }
636 }
637
638 if (code == Bytecodes::_invokeinterface) {
639 return resolve_interface_method(link_info, code, THREAD);
640 } else if (code == Bytecodes::_invokevirtual) {
641 return resolve_method(link_info, code, THREAD);
642 } else if (!resolved_klass->is_interface()) {
643 return resolve_method(link_info, code, THREAD);
644 } else {
645 return resolve_interface_method(link_info, code, THREAD);
646 }
647 }
648
649 // Check and print a loader constraint violation message for method or interface method
650 void LinkResolver::check_method_loader_constraints(const LinkInfo& link_info,
651 const methodHandle& resolved_method,
652 const char* method_type, TRAPS) {
653 Handle current_loader(THREAD, link_info.current_klass()->class_loader());
654 Handle resolved_loader(THREAD, resolved_method->method_holder()->class_loader());
655
656 ResourceMark rm(THREAD);
657 Symbol* failed_type_symbol =
658 SystemDictionary::check_signature_loaders(link_info.signature(), current_loader,
659 resolved_loader, true, CHECK);
660 if (failed_type_symbol != NULL) {
661 const char* msg = "loader constraint violation: when resolving %s"
662 " \"%s\" 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";
665 char* sig = link_info.method_string();
666 const char* loader1_name = java_lang_ClassLoader::describe_external(current_loader());
667 char* current = link_info.current_klass()->name()->as_C_string();
668 const char* loader2_name = java_lang_ClassLoader::describe_external(resolved_loader());
669 char* target = resolved_method->method_holder()->name()->as_C_string();
670 char* failed_type_name = failed_type_symbol->as_C_string();
671 size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1_name) +
672 strlen(current) + strlen(loader2_name) + strlen(target) +
673 strlen(failed_type_name) + strlen(method_type) + 1;
674 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen);
675 jio_snprintf(buf, buflen, msg, method_type, sig, loader1_name, current, loader2_name,
676 target, failed_type_name);
677 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf);
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 const char* msg = "loader constraint violation: when resolving field"
695 " \"%s\" of type %s, the class loader %s of the current class, "
696 "%s, and the class loader %s for the field's defining "
697 "type, %s, have different Class objects for type %s";
698 const char* field_name = field->as_C_string();
699 const char* loader1_name = java_lang_ClassLoader::describe_external(ref_loader());
700 const char* sel = sel_klass->external_name();
701 const char* loader2_name = java_lang_ClassLoader::describe_external(sel_loader());
702 const char* failed_type_name = failed_type_symbol->as_klass_external_name();
703 const char* curr_klass_name = current_klass->external_name();
704 size_t buflen = strlen(msg) + strlen(field_name) + 2 * strlen(failed_type_name) +
705 strlen(loader1_name) + strlen(curr_klass_name) +
706 strlen(loader2_name) + strlen(sel) + 1;
707 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen);
708 jio_snprintf(buf, buflen, msg, field_name, failed_type_name, loader1_name,
709 curr_klass_name, loader2_name, sel, failed_type_name);
710 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf);
711 }
712 }
713
714 methodHandle LinkResolver::resolve_method(const LinkInfo& link_info,
715 Bytecodes::Code code, TRAPS) {
716
717 Handle nested_exception;
718 Klass* resolved_klass = link_info.resolved_klass();
719
720 // 1. For invokevirtual, cannot call an interface method
721 if (code == Bytecodes::_invokevirtual && resolved_klass->is_interface()) {
722 ResourceMark rm(THREAD);
723 char buf[200];
724 jio_snprintf(buf, sizeof(buf), "Found interface %s, but class was expected",
725 resolved_klass->external_name());
726 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
727 }
728
729 // 2. check constant pool tag for called method - must be JVM_CONSTANT_Methodref
730 if (!link_info.tag().is_invalid() && !link_info.tag().is_method()) {
731 ResourceMark rm(THREAD);
732 char buf[200];
733 jio_snprintf(buf, sizeof(buf), "Method %s must be Methodref constant", link_info.method_string());
734 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
735 }
736
737 // 3. lookup method in resolved klass and its super klasses
738 methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, true, false));
739
740 // 4. lookup method in all the interfaces implemented by the resolved klass
741 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) { // not found in the class hierarchy
742 resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info));
743
744 if (resolved_method.is_null()) {
745 // JSR 292: see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc
746 resolved_method = lookup_polymorphic_method(link_info, (Handle*)NULL, (Handle*)NULL, THREAD);
747 if (HAS_PENDING_EXCEPTION) {
748 nested_exception = Handle(THREAD, PENDING_EXCEPTION);
749 CLEAR_PENDING_EXCEPTION;
750 }
751 }
752 }
753
754 // 5. method lookup failed
755 if (resolved_method.is_null()) {
756 ResourceMark rm(THREAD);
757 THROW_MSG_CAUSE_(vmSymbols::java_lang_NoSuchMethodError(),
758 Method::name_and_sig_as_C_string(resolved_klass,
759 link_info.name(),
760 link_info.signature()),
761 nested_exception, NULL);
762 }
763
764 // 5. 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 const methodHandle& 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 methodHandle 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 char buf[200];
834 jio_snprintf(buf, sizeof(buf), "Method %s must be InterfaceMethodref constant", link_info.method_string());
835 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
836 }
837
838 // lookup method in this interface or its super, java.lang.Object
839 // JDK8: also look for static methods
840 methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, false, true));
841
842 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) {
843 // lookup method in all the super-interfaces
844 resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info));
845 }
846
847 if (resolved_method.is_null()) {
848 // no method found
849 ResourceMark rm(THREAD);
850 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(),
851 Method::name_and_sig_as_C_string(resolved_klass,
852 link_info.name(),
853 link_info.signature()));
854 }
855
856 if (link_info.check_access()) {
857 // JDK8 adds non-public interface methods, and accessability check requirement
858 Klass* current_klass = link_info.current_klass();
859
860 assert(current_klass != NULL , "current_klass should not be null");
861
862 // check if method can be accessed by the referring class
863 check_method_accessability(current_klass,
864 resolved_klass,
865 resolved_method->method_holder(),
866 resolved_method,
867 CHECK_NULL);
868
869 check_method_loader_constraints(link_info, resolved_method, "interface method", CHECK_NULL);
870 }
871
872 if (code != Bytecodes::_invokestatic && resolved_method->is_static()) {
873 ResourceMark rm(THREAD);
874 char buf[200];
875 jio_snprintf(buf, sizeof(buf), "Expected instance not static method %s",
876 Method::name_and_sig_as_C_string(resolved_klass,
877 resolved_method->name(), resolved_method->signature()));
878 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
879 }
880
881 if (code == Bytecodes::_invokeinterface && resolved_method->is_private()) {
882 ResourceMark rm(THREAD);
883 char buf[200];
884
885 Klass* current_klass = link_info.current_klass();
886 jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokeinterface: method %s, caller-class:%s",
887 Method::name_and_sig_as_C_string(resolved_klass,
888 resolved_method->name(),
889 resolved_method->signature()),
890 (current_klass == NULL ? "<NULL>" : current_klass->internal_name()));
891 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
892 }
893
894 if (log_develop_is_enabled(Trace, itables)) {
895 char buf[200];
896 jio_snprintf(buf, sizeof(buf), "%s resolved interface method: caller-class:",
897 Bytecodes::name(code));
898 trace_method_resolution(buf, link_info.current_klass(), resolved_klass,
899 resolved_method, true);
900 }
901
902 return resolved_method;
903 }
904
905 //------------------------------------------------------------------------------------------------------------------------
906 // Field resolution
907
908 void LinkResolver::check_field_accessability(Klass* ref_klass,
909 Klass* resolved_klass,
910 Klass* sel_klass,
911 const fieldDescriptor& fd,
912 TRAPS) {
913 if (!Reflection::verify_field_access(ref_klass,
914 resolved_klass,
915 sel_klass,
916 fd.access_flags(),
917 true)) {
918 ResourceMark rm(THREAD);
919 Exceptions::fthrow(
920 THREAD_AND_LOCATION,
921 vmSymbols::java_lang_IllegalAccessError(),
922 "tried to access field %s.%s from class %s",
923 sel_klass->external_name(),
924 fd.name()->as_C_string(),
925 ref_klass->external_name()
926 );
927 return;
928 }
929 }
930
931 void LinkResolver::resolve_field_access(fieldDescriptor& fd, const constantPoolHandle& pool, int index, const methodHandle& method, Bytecodes::Code byte, TRAPS) {
932 LinkInfo link_info(pool, index, method, CHECK);
933 resolve_field(fd, link_info, byte, true, CHECK);
934 }
935
936 void LinkResolver::resolve_field(fieldDescriptor& fd,
937 const LinkInfo& link_info,
938 Bytecodes::Code byte, bool initialize_class,
939 TRAPS) {
940 assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic ||
941 byte == Bytecodes::_getfield || byte == Bytecodes::_putfield ||
942 byte == Bytecodes::_nofast_getfield || byte == Bytecodes::_nofast_putfield ||
943 (byte == Bytecodes::_nop && !link_info.check_access()), "bad field access bytecode");
944
945 bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic);
946 bool is_put = (byte == Bytecodes::_putfield || byte == Bytecodes::_putstatic || byte == Bytecodes::_nofast_putfield);
947 // Check if there's a resolved klass containing the field
948 Klass* resolved_klass = link_info.resolved_klass();
949 Symbol* field = link_info.name();
950 Symbol* sig = link_info.signature();
951
952 if (resolved_klass == NULL) {
953 ResourceMark rm(THREAD);
954 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
955 }
956
957 // Resolve instance field
958 Klass* sel_klass = resolved_klass->find_field(field, sig, &fd);
959 // check if field exists; i.e., if a klass containing the field def has been selected
960 if (sel_klass == NULL) {
961 ResourceMark rm(THREAD);
962 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
963 }
964
965 if (!link_info.check_access())
966 // Access checking may be turned off when calling from within the VM.
967 return;
968
969 // check access
970 Klass* current_klass = link_info.current_klass();
971 check_field_accessability(current_klass, resolved_klass, sel_klass, fd, CHECK);
972
973 // check for errors
974 if (is_static != fd.is_static()) {
975 ResourceMark rm(THREAD);
976 char msg[200];
977 jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string());
978 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg);
979 }
980
981 // A final field can be modified only
982 // (1) by methods declared in the class declaring the field and
983 // (2) by the <clinit> method (in case of a static field)
984 // or by the <init> method (in case of an instance field).
985 if (is_put && fd.access_flags().is_final()) {
986 ResourceMark rm(THREAD);
987 stringStream ss;
988
989 if (sel_klass != current_klass) {
990 ss.print("Update to %s final field %s.%s attempted from a different class (%s) than the field's declaring class",
991 is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(),
992 current_klass->external_name());
993 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
994 }
995
996 if (fd.constants()->pool_holder()->major_version() >= 53) {
997 methodHandle m = link_info.current_method();
998 assert(!m.is_null(), "information about the current method must be available for 'put' bytecodes");
999 bool is_initialized_static_final_update = (byte == Bytecodes::_putstatic &&
1000 fd.is_static() &&
1001 !m()->is_static_initializer());
1002 bool is_initialized_instance_final_update = ((byte == Bytecodes::_putfield || byte == Bytecodes::_nofast_putfield) &&
1003 !fd.is_static() &&
1004 !m->is_object_initializer());
1005
1006 if (is_initialized_static_final_update || is_initialized_instance_final_update) {
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 if (sel_klass != current_klass) {
1027 check_field_loader_constraints(field, sig, current_klass, sel_klass, CHECK);
1028 }
1029
1030 // return information. note that the klass is set to the actual klass containing the
1031 // field, otherwise access of static fields in superclasses will not work.
1032 }
1033
1034
1035 //------------------------------------------------------------------------------------------------------------------------
1036 // Invoke resolution
1037 //
1038 // Naming conventions:
1039 //
1040 // resolved_method the specified method (i.e., static receiver specified via constant pool index)
1041 // sel_method the selected method (selected via run-time lookup; e.g., based on dynamic receiver class)
1042 // resolved_klass the specified klass (i.e., specified via constant pool index)
1043 // recv_klass the receiver klass
1044
1045
1046 void LinkResolver::resolve_static_call(CallInfo& result,
1047 const LinkInfo& link_info,
1048 bool initialize_class, TRAPS) {
1049 methodHandle resolved_method = linktime_resolve_static_method(link_info, CHECK);
1050
1051 // The resolved class can change as a result of this resolution.
1052 Klass* resolved_klass = resolved_method->method_holder();
1053
1054 // Initialize klass (this should only happen if everything is ok)
1055 if (initialize_class && resolved_klass->should_be_initialized()) {
1056 resolved_klass->initialize(CHECK);
1057 // Use updated LinkInfo to reresolve with resolved method holder
1058 LinkInfo new_info(resolved_klass, link_info.name(), link_info.signature(),
1059 link_info.current_klass(),
1060 link_info.check_access() ? LinkInfo::needs_access_check : LinkInfo::skip_access_check);
1061 resolved_method = linktime_resolve_static_method(new_info, CHECK);
1062 }
1063
1064 // setup result
1065 result.set_static(resolved_klass, resolved_method, CHECK);
1066 }
1067
1068 // throws linktime exceptions
1069 methodHandle LinkResolver::linktime_resolve_static_method(const LinkInfo& link_info, TRAPS) {
1070
1071 Klass* resolved_klass = link_info.resolved_klass();
1072 methodHandle resolved_method;
1073 if (!resolved_klass->is_interface()) {
1074 resolved_method = resolve_method(link_info, Bytecodes::_invokestatic, CHECK_NULL);
1075 } else {
1076 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokestatic, CHECK_NULL);
1077 }
1078 assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier");
1079
1080 // check if static
1081 if (!resolved_method->is_static()) {
1082 ResourceMark rm(THREAD);
1083 char buf[200];
1084 jio_snprintf(buf, sizeof(buf), "Expected static method %s", Method::name_and_sig_as_C_string(resolved_klass,
1085 resolved_method->name(),
1086 resolved_method->signature()));
1087 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1088 }
1089 return resolved_method;
1090 }
1091
1092
1093 void LinkResolver::resolve_special_call(CallInfo& result,
1094 Handle recv,
1095 const LinkInfo& link_info,
1096 TRAPS) {
1097 methodHandle resolved_method = linktime_resolve_special_method(link_info, CHECK);
1098 runtime_resolve_special_method(result, link_info, resolved_method, recv, CHECK);
1099 }
1100
1101 // throws linktime exceptions
1102 methodHandle LinkResolver::linktime_resolve_special_method(const LinkInfo& link_info,
1103 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 methodHandle 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 Exceptions::fthrow(
1125 THREAD_AND_LOCATION,
1126 vmSymbols::java_lang_NoSuchMethodError(),
1127 "%s: method %s%s not found",
1128 resolved_klass->external_name(),
1129 resolved_method->name()->as_C_string(),
1130 resolved_method->signature()->as_C_string()
1131 );
1132 return NULL;
1133 }
1134
1135 // check if invokespecial's interface method reference is in an indirect superinterface
1136 Klass* current_klass = link_info.current_klass();
1137 if (current_klass != NULL && resolved_klass->is_interface()) {
1138 InstanceKlass* ck = InstanceKlass::cast(current_klass);
1139 InstanceKlass *klass_to_check = !ck->is_anonymous() ?
1140 ck :
1141 InstanceKlass::cast(ck->host_klass());
1142 // Disable verification for the dynamically-generated reflection bytecodes.
1143 bool is_reflect = klass_to_check->is_subclass_of(
1144 SystemDictionary::reflect_MagicAccessorImpl_klass());
1145
1146 if (!is_reflect &&
1147 !klass_to_check->is_same_or_direct_interface(resolved_klass)) {
1148 ResourceMark rm(THREAD);
1149 char buf[200];
1150 jio_snprintf(buf, sizeof(buf),
1151 "Interface method reference: %s, is in an indirect superinterface of %s",
1152 Method::name_and_sig_as_C_string(resolved_klass,
1153 resolved_method->name(),
1154 resolved_method->signature()),
1155 current_klass->external_name());
1156 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1157 }
1158 }
1159
1160 // check if not static
1161 if (resolved_method->is_static()) {
1162 ResourceMark rm(THREAD);
1163 char buf[200];
1164 jio_snprintf(buf, sizeof(buf),
1165 "Expecting non-static method %s",
1166 Method::name_and_sig_as_C_string(resolved_klass,
1167 resolved_method->name(),
1168 resolved_method->signature()));
1169 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1170 }
1171
1172 if (log_develop_is_enabled(Trace, itables)) {
1173 trace_method_resolution("invokespecial resolved method: caller-class:",
1174 current_klass, resolved_klass, resolved_method, true);
1175 }
1176
1177 return resolved_method;
1178 }
1179
1180 // throws runtime exceptions
1181 void LinkResolver::runtime_resolve_special_method(CallInfo& result,
1182 const LinkInfo& link_info,
1183 const methodHandle& resolved_method,
1184 Handle recv, TRAPS) {
1185
1186 Klass* resolved_klass = link_info.resolved_klass();
1187
1188 // resolved method is selected method unless we have an old-style lookup
1189 // for a superclass method
1190 // Invokespecial for a superinterface, resolved method is selected method,
1191 // no checks for shadowing
1192 methodHandle sel_method(THREAD, resolved_method());
1193
1194 if (link_info.check_access() &&
1195 // check if the method is not <init>
1196 resolved_method->name() != vmSymbols::object_initializer_name()) {
1197
1198 // check if this is an old-style super call and do a new lookup if so
1199 // a) check if ACC_SUPER flag is set for the current class
1200 Klass* current_klass = link_info.current_klass();
1201 if ((current_klass->is_super() || !AllowNonVirtualCalls) &&
1202 // b) check if the class of the resolved_klass is a superclass
1203 // (not supertype in order to exclude interface classes) of the current class.
1204 // This check is not performed for super.invoke for interface methods
1205 // in super interfaces.
1206 current_klass->is_subclass_of(resolved_klass) &&
1207 current_klass != resolved_klass) {
1208 // Lookup super method
1209 Klass* super_klass = current_klass->super();
1210 sel_method = lookup_instance_method_in_klasses(super_klass,
1211 resolved_method->name(),
1212 resolved_method->signature(), CHECK);
1213 // check if found
1214 if (sel_method.is_null()) {
1215 ResourceMark rm(THREAD);
1216 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1217 Method::name_and_sig_as_C_string(resolved_klass,
1218 resolved_method->name(),
1219 resolved_method->signature()));
1220 // check loader constraints if found a different method
1221 } else if (sel_method() != resolved_method()) {
1222 check_method_loader_constraints(link_info, sel_method, "method", CHECK);
1223 }
1224 }
1225
1226 // Check that the class of objectref (the receiver) is the current class or interface,
1227 // or a subtype of the current class or interface (the sender), otherwise invokespecial
1228 // throws IllegalAccessError.
1229 // The verifier checks that the sender is a subtype of the class in the I/MR operand.
1230 // The verifier also checks that the receiver is a subtype of the sender, if the sender is
1231 // a class. If the sender is an interface, the check has to be performed at runtime.
1232 InstanceKlass* sender = InstanceKlass::cast(current_klass);
1233 sender = sender->is_anonymous() ? sender->host_klass() : sender;
1234 if (sender->is_interface() && recv.not_null()) {
1235 Klass* receiver_klass = recv->klass();
1236 if (!receiver_klass->is_subtype_of(sender)) {
1237 ResourceMark rm(THREAD);
1238 char buf[500];
1239 jio_snprintf(buf, sizeof(buf),
1240 "Receiver class %s must be the current class or a subtype of interface %s",
1241 receiver_klass->name()->as_C_string(),
1242 sender->name()->as_C_string());
1243 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), buf);
1244 }
1245 }
1246 }
1247
1248 // check if not static
1249 if (sel_method->is_static()) {
1250 ResourceMark rm(THREAD);
1251 char buf[200];
1252 jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass,
1253 resolved_method->name(),
1254 resolved_method->signature()));
1255 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1256 }
1257
1258 // check if abstract
1259 if (sel_method->is_abstract()) {
1260 ResourceMark rm(THREAD);
1261 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1262 Method::name_and_sig_as_C_string(resolved_klass,
1263 sel_method->name(),
1264 sel_method->signature()));
1265 }
1266
1267 if (log_develop_is_enabled(Trace, itables)) {
1268 trace_method_resolution("invokespecial selected method: resolved-class:",
1269 resolved_klass, resolved_klass, sel_method, true);
1270 }
1271
1272 // setup result
1273 result.set_static(resolved_klass, sel_method, CHECK);
1274 }
1275
1276 void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, Klass* receiver_klass,
1277 const LinkInfo& link_info,
1278 bool check_null_and_abstract, TRAPS) {
1279 methodHandle resolved_method = linktime_resolve_virtual_method(link_info, CHECK);
1280 runtime_resolve_virtual_method(result, resolved_method,
1281 link_info.resolved_klass(),
1282 recv, receiver_klass,
1283 check_null_and_abstract, CHECK);
1284 }
1285
1286 // throws linktime exceptions
1287 methodHandle LinkResolver::linktime_resolve_virtual_method(const LinkInfo& link_info,
1288 TRAPS) {
1289 // normal method resolution
1290 methodHandle resolved_method = resolve_method(link_info, Bytecodes::_invokevirtual, CHECK_NULL);
1291
1292 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1293 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1294
1295 // check if private interface method
1296 Klass* resolved_klass = link_info.resolved_klass();
1297 Klass* current_klass = link_info.current_klass();
1298
1299 // This is impossible, if resolve_klass is an interface, we've thrown icce in resolve_method
1300 if (resolved_klass->is_interface() && resolved_method->is_private()) {
1301 ResourceMark rm(THREAD);
1302 char buf[200];
1303 jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokevirtual: method %s, caller-class:%s",
1304 Method::name_and_sig_as_C_string(resolved_klass,
1305 resolved_method->name(),
1306 resolved_method->signature()),
1307 (current_klass == NULL ? "<NULL>" : current_klass->internal_name()));
1308 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1309 }
1310
1311 // check if not static
1312 if (resolved_method->is_static()) {
1313 ResourceMark rm(THREAD);
1314 char buf[200];
1315 jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass,
1316 resolved_method->name(),
1317 resolved_method->signature()));
1318 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1319 }
1320
1321 if (log_develop_is_enabled(Trace, vtables)) {
1322 trace_method_resolution("invokevirtual resolved method: caller-class:",
1323 current_klass, resolved_klass, resolved_method, false);
1324 }
1325
1326 return resolved_method;
1327 }
1328
1329 // throws runtime exceptions
1330 void LinkResolver::runtime_resolve_virtual_method(CallInfo& result,
1331 const methodHandle& resolved_method,
1332 Klass* resolved_klass,
1333 Handle recv,
1334 Klass* recv_klass,
1335 bool check_null_and_abstract,
1336 TRAPS) {
1337
1338 // setup default return values
1339 int vtable_index = Method::invalid_vtable_index;
1340 methodHandle selected_method;
1341
1342 // runtime method resolution
1343 if (check_null_and_abstract && recv.is_null()) { // check if receiver exists
1344 THROW(vmSymbols::java_lang_NullPointerException());
1345 }
1346
1347 // Virtual methods cannot be resolved before its klass has been linked, for otherwise the Method*'s
1348 // has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since
1349 // a missing receiver might result in a bogus lookup.
1350 assert(resolved_method->method_holder()->is_linked(), "must be linked");
1351
1352 // do lookup based on receiver klass using the vtable index
1353 if (resolved_method->method_holder()->is_interface()) { // default or miranda method
1354 vtable_index = vtable_index_of_interface_method(resolved_klass, resolved_method);
1355 assert(vtable_index >= 0 , "we should have valid vtable index at this point");
1356
1357 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1358 } else {
1359 // at this point we are sure that resolved_method is virtual and not
1360 // a default or miranda method; therefore, it must have a valid vtable index.
1361 assert(!resolved_method->has_itable_index(), "");
1362 vtable_index = resolved_method->vtable_index();
1363 // We could get a negative vtable_index for final methods,
1364 // because as an optimization they are never put in the vtable,
1365 // unless they override an existing method.
1366 // If we do get a negative, it means the resolved method is the the selected
1367 // method, and it can never be changed by an override.
1368 if (vtable_index == Method::nonvirtual_vtable_index) {
1369 assert(resolved_method->can_be_statically_bound(), "cannot override this method");
1370 selected_method = resolved_method;
1371 } else {
1372 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1373 }
1374 }
1375
1376 // check if method exists
1377 if (selected_method.is_null()) {
1378 throw_abstract_method_error(resolved_method, recv_klass, CHECK);
1379 }
1380
1381 // check if abstract
1382 if (check_null_and_abstract && selected_method->is_abstract()) {
1383 // Pass arguments for generating a verbose error message.
1384 throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK);
1385 }
1386
1387 if (log_develop_is_enabled(Trace, vtables)) {
1388 trace_method_resolution("invokevirtual selected method: receiver-class:",
1389 recv_klass, resolved_klass, selected_method,
1390 false, vtable_index);
1391 }
1392 // setup result
1393 result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK);
1394 }
1395
1396 void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, Klass* recv_klass,
1397 const LinkInfo& link_info,
1398 bool check_null_and_abstract, TRAPS) {
1399 // throws linktime exceptions
1400 methodHandle resolved_method = linktime_resolve_interface_method(link_info, CHECK);
1401 runtime_resolve_interface_method(result, resolved_method,link_info.resolved_klass(),
1402 recv, recv_klass, check_null_and_abstract, CHECK);
1403 }
1404
1405 methodHandle LinkResolver::linktime_resolve_interface_method(const LinkInfo& link_info,
1406 TRAPS) {
1407 // normal interface method resolution
1408 methodHandle resolved_method = resolve_interface_method(link_info, Bytecodes::_invokeinterface, CHECK_NULL);
1409 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1410 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1411
1412 return resolved_method;
1413 }
1414
1415 // throws runtime exceptions
1416 void LinkResolver::runtime_resolve_interface_method(CallInfo& result,
1417 const methodHandle& resolved_method,
1418 Klass* resolved_klass,
1419 Handle recv,
1420 Klass* recv_klass,
1421 bool check_null_and_abstract, TRAPS) {
1422 // check if receiver exists
1423 if (check_null_and_abstract && recv.is_null()) {
1424 THROW(vmSymbols::java_lang_NullPointerException());
1425 }
1426
1427 // check if receiver klass implements the resolved interface
1428 if (!recv_klass->is_subtype_of(resolved_klass)) {
1429 ResourceMark rm(THREAD);
1430 char buf[200];
1431 jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s",
1432 recv_klass->external_name(),
1433 resolved_klass->external_name());
1434 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1435 }
1436
1437 // do lookup based on receiver klass
1438 // This search must match the linktime preparation search for itable initialization
1439 // to correctly enforce loader constraints for interface method inheritance
1440 methodHandle selected_method = lookup_instance_method_in_klasses(recv_klass,
1441 resolved_method->name(),
1442 resolved_method->signature(), CHECK);
1443 if (selected_method.is_null() && !check_null_and_abstract) {
1444 // In theory this is a harmless placeholder value, but
1445 // in practice leaving in null affects the nsk default method tests.
1446 // This needs further study.
1447 selected_method = resolved_method;
1448 }
1449 // check if method exists
1450 if (selected_method.is_null()) {
1451 // Pass arguments for generating a verbose error message.
1452 throw_abstract_method_error(resolved_method, recv_klass, CHECK);
1453 }
1454 // check access
1455 // Throw Illegal Access Error if selected_method is not public.
1456 if (!selected_method->is_public()) {
1457 ResourceMark rm(THREAD);
1458 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(),
1459 Method::name_and_sig_as_C_string(recv_klass,
1460 selected_method->name(),
1461 selected_method->signature()));
1462 }
1463 // check if abstract
1464 if (check_null_and_abstract && selected_method->is_abstract()) {
1465 throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK);
1466 }
1467
1468 if (log_develop_is_enabled(Trace, itables)) {
1469 trace_method_resolution("invokeinterface selected method: receiver-class:",
1470 recv_klass, resolved_klass, selected_method, true);
1471 }
1472 // setup result
1473 if (!resolved_method->has_itable_index()) {
1474 int vtable_index = resolved_method->vtable_index();
1475 assert(vtable_index == selected_method->vtable_index(), "sanity check");
1476 result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK);
1477 } else {
1478 int itable_index = resolved_method()->itable_index();
1479 result.set_interface(resolved_klass, recv_klass, resolved_method, selected_method, itable_index, CHECK);
1480 }
1481 }
1482
1483
1484 methodHandle LinkResolver::linktime_resolve_interface_method_or_null(
1485 const LinkInfo& link_info) {
1486 EXCEPTION_MARK;
1487 methodHandle method_result = linktime_resolve_interface_method(link_info, THREAD);
1488 if (HAS_PENDING_EXCEPTION) {
1489 CLEAR_PENDING_EXCEPTION;
1490 return methodHandle();
1491 } else {
1492 return method_result;
1493 }
1494 }
1495
1496 methodHandle LinkResolver::linktime_resolve_virtual_method_or_null(
1497 const LinkInfo& link_info) {
1498 EXCEPTION_MARK;
1499 methodHandle method_result = linktime_resolve_virtual_method(link_info, THREAD);
1500 if (HAS_PENDING_EXCEPTION) {
1501 CLEAR_PENDING_EXCEPTION;
1502 return methodHandle();
1503 } else {
1504 return method_result;
1505 }
1506 }
1507
1508 methodHandle LinkResolver::resolve_virtual_call_or_null(
1509 Klass* receiver_klass,
1510 const LinkInfo& link_info) {
1511 EXCEPTION_MARK;
1512 CallInfo info;
1513 resolve_virtual_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1514 if (HAS_PENDING_EXCEPTION) {
1515 CLEAR_PENDING_EXCEPTION;
1516 return methodHandle();
1517 }
1518 return info.selected_method();
1519 }
1520
1521 methodHandle LinkResolver::resolve_interface_call_or_null(
1522 Klass* receiver_klass,
1523 const LinkInfo& link_info) {
1524 EXCEPTION_MARK;
1525 CallInfo info;
1526 resolve_interface_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1527 if (HAS_PENDING_EXCEPTION) {
1528 CLEAR_PENDING_EXCEPTION;
1529 return methodHandle();
1530 }
1531 return info.selected_method();
1532 }
1533
1534 int LinkResolver::resolve_virtual_vtable_index(Klass* receiver_klass,
1535 const LinkInfo& link_info) {
1536 EXCEPTION_MARK;
1537 CallInfo info;
1538 resolve_virtual_call(info, Handle(), receiver_klass, link_info,
1539 /*check_null_or_abstract*/false, THREAD);
1540 if (HAS_PENDING_EXCEPTION) {
1541 CLEAR_PENDING_EXCEPTION;
1542 return Method::invalid_vtable_index;
1543 }
1544 return info.vtable_index();
1545 }
1546
1547 methodHandle LinkResolver::resolve_static_call_or_null(const LinkInfo& link_info) {
1548 EXCEPTION_MARK;
1549 CallInfo info;
1550 resolve_static_call(info, link_info, /*initialize_class*/false, THREAD);
1551 if (HAS_PENDING_EXCEPTION) {
1552 CLEAR_PENDING_EXCEPTION;
1553 return methodHandle();
1554 }
1555 return info.selected_method();
1556 }
1557
1558 methodHandle LinkResolver::resolve_special_call_or_null(const LinkInfo& link_info) {
1559 EXCEPTION_MARK;
1560 CallInfo info;
1561 resolve_special_call(info, Handle(), link_info, THREAD);
1562 if (HAS_PENDING_EXCEPTION) {
1563 CLEAR_PENDING_EXCEPTION;
1564 return methodHandle();
1565 }
1566 return info.selected_method();
1567 }
1568
1569
1570
1571 //------------------------------------------------------------------------------------------------------------------------
1572 // ConstantPool entries
1573
1574 void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) {
1575 switch (byte) {
1576 case Bytecodes::_invokestatic : resolve_invokestatic (result, pool, index, CHECK); break;
1577 case Bytecodes::_invokespecial : resolve_invokespecial (result, recv, pool, index, CHECK); break;
1578 case Bytecodes::_invokevirtual : resolve_invokevirtual (result, recv, pool, index, CHECK); break;
1579 case Bytecodes::_invokehandle : resolve_invokehandle (result, pool, index, CHECK); break;
1580 case Bytecodes::_invokedynamic : resolve_invokedynamic (result, pool, index, CHECK); break;
1581 case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break;
1582 default : break;
1583 }
1584 return;
1585 }
1586
1587 void LinkResolver::resolve_invoke(CallInfo& result, Handle& recv,
1588 const methodHandle& attached_method,
1589 Bytecodes::Code byte, TRAPS) {
1590 Klass* defc = attached_method->method_holder();
1591 Symbol* name = attached_method->name();
1592 Symbol* type = attached_method->signature();
1593 LinkInfo link_info(defc, name, type);
1594 switch(byte) {
1595 case Bytecodes::_invokevirtual:
1596 resolve_virtual_call(result, recv, recv->klass(), link_info,
1597 /*check_null_and_abstract=*/true, CHECK);
1598 break;
1599 case Bytecodes::_invokeinterface:
1600 resolve_interface_call(result, recv, recv->klass(), link_info,
1601 /*check_null_and_abstract=*/true, CHECK);
1602 break;
1603 case Bytecodes::_invokestatic:
1604 resolve_static_call(result, link_info, /*initialize_class=*/false, CHECK);
1605 break;
1606 case Bytecodes::_invokespecial:
1607 resolve_special_call(result, recv, link_info, CHECK);
1608 break;
1609 default:
1610 fatal("bad call: %s", Bytecodes::name(byte));
1611 break;
1612 }
1613 }
1614
1615 void LinkResolver::resolve_invokestatic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1616 LinkInfo link_info(pool, index, CHECK);
1617 resolve_static_call(result, link_info, /*initialize_class*/true, CHECK);
1618 }
1619
1620
1621 void LinkResolver::resolve_invokespecial(CallInfo& result, Handle recv,
1622 const constantPoolHandle& pool, int index, TRAPS) {
1623 LinkInfo link_info(pool, index, CHECK);
1624 resolve_special_call(result, recv, link_info, CHECK);
1625 }
1626
1627
1628 void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv,
1629 const constantPoolHandle& pool, int index,
1630 TRAPS) {
1631
1632 LinkInfo link_info(pool, index, CHECK);
1633 Klass* recvrKlass = recv.is_null() ? (Klass*)NULL : recv->klass();
1634 resolve_virtual_call(result, recv, recvrKlass, link_info, /*check_null_or_abstract*/true, CHECK);
1635 }
1636
1637
1638 void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, TRAPS) {
1639 LinkInfo link_info(pool, index, CHECK);
1640 Klass* recvrKlass = recv.is_null() ? (Klass*)NULL : recv->klass();
1641 resolve_interface_call(result, recv, recvrKlass, link_info, true, CHECK);
1642 }
1643
1644
1645 void LinkResolver::resolve_invokehandle(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1646 // This guy is reached from InterpreterRuntime::resolve_invokehandle.
1647 LinkInfo link_info(pool, index, CHECK);
1648 if (TraceMethodHandles) {
1649 ResourceMark rm(THREAD);
1650 tty->print_cr("resolve_invokehandle %s %s", link_info.name()->as_C_string(),
1651 link_info.signature()->as_C_string());
1652 }
1653 resolve_handle_call(result, link_info, CHECK);
1654 }
1655
1656 void LinkResolver::resolve_handle_call(CallInfo& result,
1657 const LinkInfo& link_info,
1658 TRAPS) {
1659 // JSR 292: this must be an implicitly generated method MethodHandle.invokeExact(*...) or similar
1660 Klass* resolved_klass = link_info.resolved_klass();
1661 assert(resolved_klass == SystemDictionary::MethodHandle_klass() ||
1662 resolved_klass == SystemDictionary::VarHandle_klass(), "");
1663 assert(MethodHandles::is_signature_polymorphic_name(link_info.name()), "");
1664 Handle resolved_appendix;
1665 Handle resolved_method_type;
1666 methodHandle resolved_method = lookup_polymorphic_method(link_info,
1667 &resolved_appendix, &resolved_method_type, CHECK);
1668 result.set_handle(resolved_klass, resolved_method, resolved_appendix, resolved_method_type, CHECK);
1669 }
1670
1671 void LinkResolver::resolve_invokedynamic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1672 Symbol* method_name = pool->name_ref_at(index);
1673 Symbol* method_signature = pool->signature_ref_at(index);
1674 Klass* current_klass = pool->pool_holder();
1675
1676 // Resolve the bootstrap specifier (BSM + optional arguments).
1677 Handle bootstrap_specifier;
1678 // Check if CallSite has been bound already:
1679 ConstantPoolCacheEntry* cpce = pool->invokedynamic_cp_cache_entry_at(index);
1680 int pool_index = cpce->constant_pool_index();
1681
1682 if (cpce->is_f1_null()) {
1683 if (cpce->indy_resolution_failed()) {
1684 ConstantPool::throw_resolution_error(pool,
1685 ResolutionErrorTable::encode_cpcache_index(index),
1686 CHECK);
1687 }
1688
1689 // The initial step in Call Site Specifier Resolution is to resolve the symbolic
1690 // reference to a method handle which will be the bootstrap method for a dynamic
1691 // call site. If resolution for the java.lang.invoke.MethodHandle for the bootstrap
1692 // method fails, then a MethodHandleInError is stored at the corresponding bootstrap
1693 // method's CP index for the CONSTANT_MethodHandle_info. So, there is no need to
1694 // set the indy_rf flag since any subsequent invokedynamic instruction which shares
1695 // this bootstrap method will encounter the resolution of MethodHandleInError.
1696 oop bsm_info = pool->resolve_bootstrap_specifier_at(pool_index, THREAD);
1697 Exceptions::wrap_dynamic_exception(CHECK);
1698 assert(bsm_info != NULL, "");
1699 // FIXME: Cache this once per BootstrapMethods entry, not once per CONSTANT_InvokeDynamic.
1700 bootstrap_specifier = Handle(THREAD, bsm_info);
1701 }
1702 if (!cpce->is_f1_null()) {
1703 methodHandle method( THREAD, cpce->f1_as_method());
1704 Handle appendix( THREAD, cpce->appendix_if_resolved(pool));
1705 Handle method_type(THREAD, cpce->method_type_if_resolved(pool));
1706 result.set_handle(method, appendix, method_type, THREAD);
1707 Exceptions::wrap_dynamic_exception(CHECK);
1708 return;
1709 }
1710
1711 if (TraceMethodHandles) {
1712 ResourceMark rm(THREAD);
1713 tty->print_cr("resolve_invokedynamic #%d %s %s in %s",
1714 ConstantPool::decode_invokedynamic_index(index),
1715 method_name->as_C_string(), method_signature->as_C_string(),
1716 current_klass->name()->as_C_string());
1717 tty->print(" BSM info: "); bootstrap_specifier->print();
1718 }
1719
1720 resolve_dynamic_call(result, pool_index, bootstrap_specifier, method_name,
1721 method_signature, current_klass, THREAD);
1722 if (HAS_PENDING_EXCEPTION && PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1723 int encoded_index = ResolutionErrorTable::encode_cpcache_index(index);
1724 bool recorded_res_status = cpce->save_and_throw_indy_exc(pool, pool_index,
1725 encoded_index,
1726 pool()->tag_at(pool_index),
1727 CHECK);
1728 if (!recorded_res_status) {
1729 // Another thread got here just before we did. So, either use the method
1730 // that it resolved or throw the LinkageError exception that it threw.
1731 if (!cpce->is_f1_null()) {
1732 methodHandle method( THREAD, cpce->f1_as_method());
1733 Handle appendix( THREAD, cpce->appendix_if_resolved(pool));
1734 Handle method_type(THREAD, cpce->method_type_if_resolved(pool));
1735 result.set_handle(method, appendix, method_type, THREAD);
1736 Exceptions::wrap_dynamic_exception(CHECK);
1737 } else {
1738 assert(cpce->indy_resolution_failed(), "Resolution failure flag not set");
1739 ConstantPool::throw_resolution_error(pool, encoded_index, CHECK);
1740 }
1741 return;
1742 }
1743 assert(cpce->indy_resolution_failed(), "Resolution failure flag wasn't set");
1744 }
1745 }
1746
1747 void LinkResolver::resolve_dynamic_call(CallInfo& result,
1748 int pool_index,
1749 Handle bootstrap_specifier,
1750 Symbol* method_name, Symbol* method_signature,
1751 Klass* current_klass,
1752 TRAPS) {
1753 // JSR 292: this must resolve to an implicitly generated method MH.linkToCallSite(*...)
1754 // The appendix argument is likely to be a freshly-created CallSite.
1755 Handle resolved_appendix;
1756 Handle resolved_method_type;
1757 methodHandle resolved_method =
1758 SystemDictionary::find_dynamic_call_site_invoker(current_klass,
1759 pool_index,
1760 bootstrap_specifier,
1761 method_name, method_signature,
1762 &resolved_appendix,
1763 &resolved_method_type,
1764 THREAD);
1765 Exceptions::wrap_dynamic_exception(CHECK);
1766 result.set_handle(resolved_method, resolved_appendix, resolved_method_type, THREAD);
1767 Exceptions::wrap_dynamic_exception(CHECK);
1768 }
1769
1770 // Selected method is abstract.
1771 void LinkResolver::throw_abstract_method_error(const methodHandle& resolved_method,
1772 const methodHandle& selected_method,
1773 Klass *recv_klass, TRAPS) {
1774 Klass *resolved_klass = resolved_method->method_holder();
1775 ResourceMark rm(THREAD);
1776 stringStream ss;
1777
1778 if (recv_klass != NULL) {
1779 ss.print("Receiver class %s does not define or inherit an "
1780 "implementation of the",
1781 recv_klass->external_name());
1782 } else {
1783 ss.print("Missing implementation of");
1784 }
1785
1786 assert(resolved_method.not_null(), "Sanity");
1787 ss.print(" resolved method %s%s%s%s of %s %s.",
1788 resolved_method->is_abstract() ? "abstract " : "",
1789 resolved_method->is_private() ? "private " : "",
1790 resolved_method->name()->as_C_string(),
1791 resolved_method->signature()->as_C_string(),
1792 resolved_klass->external_kind(),
1793 resolved_klass->external_name());
1794
1795 if (selected_method.not_null() && !(resolved_method == selected_method)) {
1796 ss.print(" Selected method is %s%s%s.",
1797 selected_method->is_abstract() ? "abstract " : "",
1798 selected_method->is_private() ? "private " : "",
1799 selected_method->name_and_sig_as_C_string());
1800 }
1801
1802 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1803 }