1/*
2 * Copyright (c) 1997, 2019, 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/bootstrapInfo.hpp"
36#include "interpreter/bytecode.hpp"
37#include "interpreter/interpreterRuntime.hpp"
38#include "interpreter/linkResolver.hpp"
39#include "logging/log.hpp"
40#include "logging/logStream.hpp"
41#include "memory/resourceArea.hpp"
42#include "oops/constantPool.hpp"
43#include "oops/cpCache.inline.hpp"
44#include "oops/instanceKlass.hpp"
45#include "oops/method.hpp"
46#include "oops/objArrayKlass.hpp"
47#include "oops/objArrayOop.hpp"
48#include "oops/oop.inline.hpp"
49#include "prims/methodHandles.hpp"
50#include "prims/nativeLookup.hpp"
51#include "runtime/compilationPolicy.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
65void CallInfo::set_static(Klass* resolved_klass, const methodHandle& resolved_method, TRAPS) {
66 int vtable_index = Method::nonvirtual_vtable_index;
67 set_common(resolved_klass, resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK);
68}
69
70
71void CallInfo::set_interface(Klass* resolved_klass,
72 Klass* selected_klass,
73 const methodHandle& resolved_method,
74 const methodHandle& selected_method,
75 int itable_index, TRAPS) {
76 // This is only called for interface methods. If the resolved_method
77 // comes from java/lang/Object, it can be the subject of a virtual call, so
78 // we should pick the vtable index from the resolved method.
79 // In that case, the caller must call set_virtual instead of set_interface.
80 assert(resolved_method->method_holder()->is_interface(), "");
81 assert(itable_index == resolved_method()->itable_index(), "");
82 set_common(resolved_klass, selected_klass, resolved_method, selected_method, CallInfo::itable_call, itable_index, CHECK);
83}
84
85void CallInfo::set_virtual(Klass* resolved_klass,
86 Klass* selected_klass,
87 const methodHandle& resolved_method,
88 const methodHandle& selected_method,
89 int vtable_index, TRAPS) {
90 assert(vtable_index >= 0 || vtable_index == Method::nonvirtual_vtable_index, "valid index");
91 assert(vtable_index < 0 || !resolved_method->has_vtable_index() || vtable_index == resolved_method->vtable_index(), "");
92 CallKind kind = (vtable_index >= 0 && !resolved_method->can_be_statically_bound() ? CallInfo::vtable_call : CallInfo::direct_call);
93 set_common(resolved_klass, selected_klass, resolved_method, selected_method, kind, vtable_index, CHECK);
94 assert(!resolved_method->is_compiled_lambda_form(), "these must be handled via an invokehandle call");
95}
96
97void CallInfo::set_handle(const methodHandle& resolved_method,
98 Handle resolved_appendix, TRAPS) {
99 set_handle(SystemDictionary::MethodHandle_klass(), resolved_method, resolved_appendix, CHECK);
100}
101
102void CallInfo::set_handle(Klass* resolved_klass,
103 const methodHandle& resolved_method,
104 Handle resolved_appendix, TRAPS) {
105 guarantee(resolved_method.not_null(), "resolved method is null");
106 assert(resolved_method->intrinsic_id() == vmIntrinsics::_invokeBasic ||
107 resolved_method->is_compiled_lambda_form(),
108 "linkMethod must return one of these");
109 int vtable_index = Method::nonvirtual_vtable_index;
110 assert(!resolved_method->has_vtable_index(), "");
111 set_common(resolved_klass, resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK);
112 _resolved_appendix = resolved_appendix;
113}
114
115void CallInfo::set_common(Klass* resolved_klass,
116 Klass* selected_klass,
117 const methodHandle& resolved_method,
118 const methodHandle& selected_method,
119 CallKind kind,
120 int index,
121 TRAPS) {
122 assert(resolved_method->signature() == selected_method->signature(), "signatures must correspond");
123 _resolved_klass = resolved_klass;
124 _selected_klass = selected_klass;
125 _resolved_method = resolved_method;
126 _selected_method = selected_method;
127 _call_kind = kind;
128 _call_index = index;
129 _resolved_appendix = Handle();
130 DEBUG_ONLY(verify()); // verify before making side effects
131
132 CompilationPolicy::compile_if_required(selected_method, THREAD);
133}
134
135// utility query for unreflecting a method
136CallInfo::CallInfo(Method* resolved_method, Klass* resolved_klass, TRAPS) {
137 Klass* resolved_method_holder = resolved_method->method_holder();
138 if (resolved_klass == NULL) { // 2nd argument defaults to holder of 1st
139 resolved_klass = resolved_method_holder;
140 }
141 _resolved_klass = resolved_klass;
142 _selected_klass = resolved_klass;
143 _resolved_method = resolved_method;
144 _selected_method = resolved_method;
145 // classify:
146 CallKind kind = CallInfo::unknown_kind;
147 int index = resolved_method->vtable_index();
148 if (resolved_method->can_be_statically_bound()) {
149 kind = CallInfo::direct_call;
150 } else if (!resolved_method_holder->is_interface()) {
151 // Could be an Object method inherited into an interface, but still a vtable call.
152 kind = CallInfo::vtable_call;
153 } else if (!resolved_klass->is_interface()) {
154 // A default or miranda method. Compute the vtable index.
155 index = LinkResolver::vtable_index_of_interface_method(resolved_klass,
156 resolved_method);
157 assert(index >= 0 , "we should have valid vtable index at this point");
158
159 kind = CallInfo::vtable_call;
160 } else if (resolved_method->has_vtable_index()) {
161 // Can occur if an interface redeclares a method of Object.
162
163#ifdef ASSERT
164 // Ensure that this is really the case.
165 Klass* object_klass = SystemDictionary::Object_klass();
166 Method * object_resolved_method = object_klass->vtable().method_at(index);
167 assert(object_resolved_method->name() == resolved_method->name(),
168 "Object and interface method names should match at vtable index %d, %s != %s",
169 index, object_resolved_method->name()->as_C_string(), resolved_method->name()->as_C_string());
170 assert(object_resolved_method->signature() == resolved_method->signature(),
171 "Object and interface method signatures should match at vtable index %d, %s != %s",
172 index, object_resolved_method->signature()->as_C_string(), resolved_method->signature()->as_C_string());
173#endif // ASSERT
174
175 kind = CallInfo::vtable_call;
176 } else {
177 // A regular interface call.
178 kind = CallInfo::itable_call;
179 index = resolved_method->itable_index();
180 }
181 assert(index == Method::nonvirtual_vtable_index || index >= 0, "bad index %d", index);
182 _call_kind = kind;
183 _call_index = index;
184 _resolved_appendix = Handle();
185 // Find or create a ResolvedMethod instance for this Method*
186 set_resolved_method_name(CHECK);
187
188 DEBUG_ONLY(verify());
189}
190
191void CallInfo::set_resolved_method_name(TRAPS) {
192 Method* m = _resolved_method();
193 assert(m != NULL, "Should already have a Method*");
194 oop rmethod_name = java_lang_invoke_ResolvedMethodName::find_resolved_method(m, CHECK);
195 _resolved_method_name = Handle(THREAD, rmethod_name);
196}
197
198#ifdef ASSERT
199void CallInfo::verify() {
200 switch (call_kind()) { // the meaning and allowed value of index depends on kind
201 case CallInfo::direct_call:
202 if (_call_index == Method::nonvirtual_vtable_index) break;
203 // else fall through to check vtable index:
204 case CallInfo::vtable_call:
205 assert(resolved_klass()->verify_vtable_index(_call_index), "");
206 break;
207 case CallInfo::itable_call:
208 assert(resolved_method()->method_holder()->verify_itable_index(_call_index), "");
209 break;
210 case CallInfo::unknown_kind:
211 assert(call_kind() != CallInfo::unknown_kind, "CallInfo must be set");
212 break;
213 default:
214 fatal("Unexpected call kind %d", call_kind());
215 }
216}
217#endif // ASSERT
218
219#ifndef PRODUCT
220void CallInfo::print() {
221 ResourceMark rm;
222 const char* kindstr;
223 switch (_call_kind) {
224 case direct_call: kindstr = "direct"; break;
225 case vtable_call: kindstr = "vtable"; break;
226 case itable_call: kindstr = "itable"; break;
227 default : kindstr = "unknown"; break;
228 }
229 tty->print_cr("Call %s@%d %s", kindstr, _call_index,
230 _resolved_method.is_null() ? "(none)" : _resolved_method->name_and_sig_as_C_string());
231}
232#endif
233
234//------------------------------------------------------------------------------------------------------------------------
235// Implementation of LinkInfo
236
237LinkInfo::LinkInfo(const constantPoolHandle& pool, int index, const methodHandle& current_method, TRAPS) {
238 // resolve klass
239 _resolved_klass = pool->klass_ref_at(index, CHECK);
240
241 // Get name, signature, and static klass
242 _name = pool->name_ref_at(index);
243 _signature = pool->signature_ref_at(index);
244 _tag = pool->tag_ref_at(index);
245 _current_klass = pool->pool_holder();
246 _current_method = current_method;
247
248 // Coming from the constant pool always checks access
249 _check_access = true;
250}
251
252LinkInfo::LinkInfo(const constantPoolHandle& pool, int index, TRAPS) {
253 // resolve klass
254 _resolved_klass = pool->klass_ref_at(index, CHECK);
255
256 // Get name, signature, and static klass
257 _name = pool->name_ref_at(index);
258 _signature = pool->signature_ref_at(index);
259 _tag = pool->tag_ref_at(index);
260 _current_klass = pool->pool_holder();
261 _current_method = methodHandle();
262
263 // Coming from the constant pool always checks access
264 _check_access = true;
265}
266
267#ifndef PRODUCT
268void LinkInfo::print() {
269 ResourceMark rm;
270 tty->print_cr("Link resolved_klass=%s name=%s signature=%s current_klass=%s check_access=%s",
271 _resolved_klass->name()->as_C_string(),
272 _name->as_C_string(),
273 _signature->as_C_string(),
274 _current_klass == NULL ? "(none)" : _current_klass->name()->as_C_string(),
275 _check_access ? "true" : "false");
276}
277#endif // PRODUCT
278//------------------------------------------------------------------------------------------------------------------------
279// Klass resolution
280
281void LinkResolver::check_klass_accessability(Klass* ref_klass, Klass* sel_klass,
282 bool fold_type_to_class, TRAPS) {
283 Klass* base_klass = sel_klass;
284 if (fold_type_to_class) {
285 if (sel_klass->is_objArray_klass()) {
286 base_klass = ObjArrayKlass::cast(sel_klass)->bottom_klass();
287 }
288 // The element type could be a typeArray - we only need the access
289 // check if it is a reference to another class.
290 if (!base_klass->is_instance_klass()) {
291 return; // no relevant check to do
292 }
293 }
294 Reflection::VerifyClassAccessResults vca_result =
295 Reflection::verify_class_access(ref_klass, InstanceKlass::cast(base_klass), true);
296 if (vca_result != Reflection::ACCESS_OK) {
297 ResourceMark rm(THREAD);
298 char* msg = Reflection::verify_class_access_msg(ref_klass,
299 InstanceKlass::cast(base_klass),
300 vca_result);
301 bool same_module = (base_klass->module() == ref_klass->module());
302 if (msg == NULL) {
303 Exceptions::fthrow(
304 THREAD_AND_LOCATION,
305 vmSymbols::java_lang_IllegalAccessError(),
306 "failed to access class %s from class %s (%s%s%s)",
307 base_klass->external_name(),
308 ref_klass->external_name(),
309 (same_module) ? base_klass->joint_in_module_of_loader(ref_klass) : base_klass->class_in_module_of_loader(),
310 (same_module) ? "" : "; ",
311 (same_module) ? "" : ref_klass->class_in_module_of_loader());
312 } else {
313 // Use module specific message returned by verify_class_access_msg().
314 Exceptions::fthrow(
315 THREAD_AND_LOCATION,
316 vmSymbols::java_lang_IllegalAccessError(),
317 "%s", msg);
318 }
319 }
320}
321
322//------------------------------------------------------------------------------------------------------------------------
323// Method resolution
324//
325// According to JVM spec. $5.4.3c & $5.4.3d
326
327// Look up method in klasses, including static methods
328// Then look up local default methods
329Method* LinkResolver::lookup_method_in_klasses(const LinkInfo& link_info,
330 bool checkpolymorphism,
331 bool in_imethod_resolve) {
332 NoSafepointVerifier nsv; // Method* returned may not be reclaimed
333
334 Klass* klass = link_info.resolved_klass();
335 Symbol* name = link_info.name();
336 Symbol* signature = link_info.signature();
337
338 // Ignore overpasses so statics can be found during resolution
339 Method* result = klass->uncached_lookup_method(name, signature, Klass::skip_overpass);
340
341 if (klass->is_array_klass()) {
342 // Only consider klass and super klass for arrays
343 return result;
344 }
345
346 InstanceKlass* ik = InstanceKlass::cast(klass);
347
348 // JDK 8, JVMS 5.4.3.4: Interface method resolution should
349 // ignore static and non-public methods of java.lang.Object,
350 // like clone, finalize, registerNatives.
351 if (in_imethod_resolve &&
352 result != NULL &&
353 ik->is_interface() &&
354 (result->is_static() || !result->is_public()) &&
355 result->method_holder() == SystemDictionary::Object_klass()) {
356 result = NULL;
357 }
358
359 // Before considering default methods, check for an overpass in the
360 // current class if a method has not been found.
361 if (result == NULL) {
362 result = ik->find_method(name, signature);
363 }
364
365 if (result == NULL) {
366 Array<Method*>* default_methods = ik->default_methods();
367 if (default_methods != NULL) {
368 result = InstanceKlass::find_method(default_methods, name, signature);
369 }
370 }
371
372 if (checkpolymorphism && result != NULL) {
373 vmIntrinsics::ID iid = result->intrinsic_id();
374 if (MethodHandles::is_signature_polymorphic(iid)) {
375 // Do not link directly to these. The VM must produce a synthetic one using lookup_polymorphic_method.
376 return NULL;
377 }
378 }
379 return result;
380}
381
382// returns first instance method
383// Looks up method in classes, then looks up local default methods
384methodHandle LinkResolver::lookup_instance_method_in_klasses(Klass* klass,
385 Symbol* name,
386 Symbol* signature,
387 Klass::PrivateLookupMode private_mode, TRAPS) {
388 Method* result = klass->uncached_lookup_method(name, signature, Klass::find_overpass, private_mode);
389
390 while (result != NULL && result->is_static() && result->method_holder()->super() != NULL) {
391 Klass* super_klass = result->method_holder()->super();
392 result = super_klass->uncached_lookup_method(name, signature, Klass::find_overpass, private_mode);
393 }
394
395 if (klass->is_array_klass()) {
396 // Only consider klass and super klass for arrays
397 return methodHandle(THREAD, result);
398 }
399
400 if (result == NULL) {
401 Array<Method*>* default_methods = InstanceKlass::cast(klass)->default_methods();
402 if (default_methods != NULL) {
403 result = InstanceKlass::find_method(default_methods, name, signature);
404 assert(result == NULL || !result->is_static(), "static defaults not allowed");
405 }
406 }
407 return methodHandle(THREAD, result);
408}
409
410int LinkResolver::vtable_index_of_interface_method(Klass* klass,
411 const methodHandle& resolved_method) {
412
413 int vtable_index = Method::invalid_vtable_index;
414 Symbol* name = resolved_method->name();
415 Symbol* signature = resolved_method->signature();
416 InstanceKlass* ik = InstanceKlass::cast(klass);
417
418 // First check in default method array
419 if (!resolved_method->is_abstract() && ik->default_methods() != NULL) {
420 int index = InstanceKlass::find_method_index(ik->default_methods(),
421 name, signature, Klass::find_overpass,
422 Klass::find_static, Klass::find_private);
423 if (index >= 0 ) {
424 vtable_index = ik->default_vtable_indices()->at(index);
425 }
426 }
427 if (vtable_index == Method::invalid_vtable_index) {
428 // get vtable_index for miranda methods
429 klassVtable vt = ik->vtable();
430 vtable_index = vt.index_of_miranda(name, signature);
431 }
432 return vtable_index;
433}
434
435Method* LinkResolver::lookup_method_in_interfaces(const LinkInfo& cp_info) {
436 InstanceKlass *ik = InstanceKlass::cast(cp_info.resolved_klass());
437
438 // Specify 'true' in order to skip default methods when searching the
439 // interfaces. Function lookup_method_in_klasses() already looked for
440 // the method in the default methods table.
441 return ik->lookup_method_in_all_interfaces(cp_info.name(), cp_info.signature(), Klass::skip_defaults);
442}
443
444methodHandle LinkResolver::lookup_polymorphic_method(
445 const LinkInfo& link_info,
446 Handle *appendix_result_or_null,
447 TRAPS) {
448 Klass* klass = link_info.resolved_klass();
449 Symbol* name = link_info.name();
450 Symbol* full_signature = link_info.signature();
451
452 vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name);
453 if (TraceMethodHandles) {
454 ResourceMark rm(THREAD);
455 tty->print_cr("lookup_polymorphic_method iid=%s %s.%s%s",
456 vmIntrinsics::name_at(iid), klass->external_name(),
457 name->as_C_string(), full_signature->as_C_string());
458 }
459 if ((klass == SystemDictionary::MethodHandle_klass() ||
460 klass == SystemDictionary::VarHandle_klass()) &&
461 iid != vmIntrinsics::_none) {
462 if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) {
463 // Most of these do not need an up-call to Java to resolve, so can be done anywhere.
464 // Do not erase last argument type (MemberName) if it is a static linkTo method.
465 bool keep_last_arg = MethodHandles::is_signature_polymorphic_static(iid);
466 TempNewSymbol basic_signature =
467 MethodHandles::lookup_basic_type_signature(full_signature, keep_last_arg, CHECK_NULL);
468 if (TraceMethodHandles) {
469 ResourceMark rm(THREAD);
470 tty->print_cr("lookup_polymorphic_method %s %s => basic %s",
471 name->as_C_string(),
472 full_signature->as_C_string(),
473 basic_signature->as_C_string());
474 }
475 methodHandle result = SystemDictionary::find_method_handle_intrinsic(iid,
476 basic_signature,
477 CHECK_NULL);
478 if (result.not_null()) {
479 assert(result->is_method_handle_intrinsic(), "MH.invokeBasic or MH.linkTo* intrinsic");
480 assert(result->intrinsic_id() != vmIntrinsics::_invokeGeneric, "wrong place to find this");
481 assert(basic_signature == result->signature(), "predict the result signature");
482 if (TraceMethodHandles) {
483 ttyLocker ttyl;
484 tty->print("lookup_polymorphic_method => intrinsic ");
485 result->print_on(tty);
486 }
487 }
488 return result;
489 } else if (iid == vmIntrinsics::_invokeGeneric
490 && THREAD->can_call_java()
491 && appendix_result_or_null != NULL) {
492 // This is a method with type-checking semantics.
493 // We will ask Java code to spin an adapter method for it.
494 if (!MethodHandles::enabled()) {
495 // Make sure the Java part of the runtime has been booted up.
496 Klass* natives = SystemDictionary::MethodHandleNatives_klass();
497 if (natives == NULL || InstanceKlass::cast(natives)->is_not_initialized()) {
498 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_invoke_MethodHandleNatives(),
499 Handle(),
500 Handle(),
501 true,
502 CHECK_NULL);
503 }
504 }
505
506 Handle appendix;
507 Handle method_type;
508 methodHandle result = SystemDictionary::find_method_handle_invoker(
509 klass,
510 name,
511 full_signature,
512 link_info.current_klass(),
513 &appendix,
514 CHECK_NULL);
515 if (TraceMethodHandles) {
516 ttyLocker ttyl;
517 tty->print("lookup_polymorphic_method => (via Java) ");
518 result->print_on(tty);
519 tty->print(" lookup_polymorphic_method => appendix = ");
520 if (appendix.is_null()) tty->print_cr("(none)");
521 else appendix->print_on(tty);
522 }
523 if (result.not_null()) {
524#ifdef ASSERT
525 ResourceMark rm(THREAD);
526
527 TempNewSymbol basic_signature =
528 MethodHandles::lookup_basic_type_signature(full_signature, CHECK_NULL);
529 int actual_size_of_params = result->size_of_parameters();
530 int expected_size_of_params = ArgumentSizeComputer(basic_signature).size();
531 // +1 for MethodHandle.this, +1 for trailing MethodType
532 if (!MethodHandles::is_signature_polymorphic_static(iid)) expected_size_of_params += 1;
533 if (appendix.not_null()) expected_size_of_params += 1;
534 if (actual_size_of_params != expected_size_of_params) {
535 tty->print_cr("*** basic_signature=%s", basic_signature->as_C_string());
536 tty->print_cr("*** result for %s: ", vmIntrinsics::name_at(iid));
537 result->print();
538 }
539 assert(actual_size_of_params == expected_size_of_params,
540 "%d != %d", actual_size_of_params, expected_size_of_params);
541#endif //ASSERT
542
543 assert(appendix_result_or_null != NULL, "");
544 (*appendix_result_or_null) = appendix;
545 }
546 return result;
547 }
548 }
549 return NULL;
550}
551
552void LinkResolver::check_method_accessability(Klass* ref_klass,
553 Klass* resolved_klass,
554 Klass* sel_klass,
555 const methodHandle& sel_method,
556 TRAPS) {
557
558 AccessFlags flags = sel_method->access_flags();
559
560 // Special case: arrays always override "clone". JVMS 2.15.
561 // If the resolved klass is an array class, and the declaring class
562 // is java.lang.Object and the method is "clone", set the flags
563 // to public.
564 //
565 // We'll check for the method name first, as that's most likely
566 // to be false (so we'll short-circuit out of these tests).
567 if (sel_method->name() == vmSymbols::clone_name() &&
568 sel_klass == SystemDictionary::Object_klass() &&
569 resolved_klass->is_array_klass()) {
570 // We need to change "protected" to "public".
571 assert(flags.is_protected(), "clone not protected?");
572 jint new_flags = flags.as_int();
573 new_flags = new_flags & (~JVM_ACC_PROTECTED);
574 new_flags = new_flags | JVM_ACC_PUBLIC;
575 flags.set_flags(new_flags);
576 }
577// assert(extra_arg_result_or_null != NULL, "must be able to return extra argument");
578
579 bool can_access = Reflection::verify_member_access(ref_klass,
580 resolved_klass,
581 sel_klass,
582 flags,
583 true, false, CHECK);
584 // Any existing exceptions that may have been thrown, for example LinkageErrors
585 // from nest-host resolution, have been allowed to propagate.
586 if (!can_access) {
587 ResourceMark rm(THREAD);
588 bool same_module = (sel_klass->module() == ref_klass->module());
589 Exceptions::fthrow(
590 THREAD_AND_LOCATION,
591 vmSymbols::java_lang_IllegalAccessError(),
592 "class %s tried to access %s%s%smethod '%s' (%s%s%s)",
593 ref_klass->external_name(),
594 sel_method->is_abstract() ? "abstract " : "",
595 sel_method->is_protected() ? "protected " : "",
596 sel_method->is_private() ? "private " : "",
597 sel_method->external_name(),
598 (same_module) ? ref_klass->joint_in_module_of_loader(sel_klass) : ref_klass->class_in_module_of_loader(),
599 (same_module) ? "" : "; ",
600 (same_module) ? "" : sel_klass->class_in_module_of_loader()
601 );
602 return;
603 }
604}
605
606methodHandle LinkResolver::resolve_method_statically(Bytecodes::Code code,
607 const constantPoolHandle& pool, int index, TRAPS) {
608 // This method is used only
609 // (1) in C2 from InlineTree::ok_to_inline (via ciMethod::check_call),
610 // and
611 // (2) in Bytecode_invoke::static_target
612 // It appears to fail when applied to an invokeinterface call site.
613 // FIXME: Remove this method and ciMethod::check_call; refactor to use the other LinkResolver entry points.
614 // resolve klass
615 if (code == Bytecodes::_invokedynamic) {
616 Klass* resolved_klass = SystemDictionary::MethodHandle_klass();
617 Symbol* method_name = vmSymbols::invoke_name();
618 Symbol* method_signature = pool->signature_ref_at(index);
619 Klass* current_klass = pool->pool_holder();
620 LinkInfo link_info(resolved_klass, method_name, method_signature, current_klass);
621 return resolve_method(link_info, code, THREAD);
622 }
623
624 LinkInfo link_info(pool, index, methodHandle(), CHECK_NULL);
625 Klass* resolved_klass = link_info.resolved_klass();
626
627 if (pool->has_preresolution()
628 || (resolved_klass == SystemDictionary::MethodHandle_klass() &&
629 MethodHandles::is_signature_polymorphic_name(resolved_klass, link_info.name()))) {
630 Method* result = ConstantPool::method_at_if_loaded(pool, index);
631 if (result != NULL) {
632 return methodHandle(THREAD, result);
633 }
634 }
635
636 if (code == Bytecodes::_invokeinterface) {
637 return resolve_interface_method(link_info, code, THREAD);
638 } else if (code == Bytecodes::_invokevirtual) {
639 return resolve_method(link_info, code, THREAD);
640 } else if (!resolved_klass->is_interface()) {
641 return resolve_method(link_info, code, THREAD);
642 } else {
643 return resolve_interface_method(link_info, code, THREAD);
644 }
645}
646
647// Check and print a loader constraint violation message for method or interface method
648void LinkResolver::check_method_loader_constraints(const LinkInfo& link_info,
649 const methodHandle& resolved_method,
650 const char* method_type, TRAPS) {
651 Handle current_loader(THREAD, link_info.current_klass()->class_loader());
652 Handle resolved_loader(THREAD, resolved_method->method_holder()->class_loader());
653
654 ResourceMark rm(THREAD);
655 Symbol* failed_type_symbol =
656 SystemDictionary::check_signature_loaders(link_info.signature(), current_loader,
657 resolved_loader, true, CHECK);
658 if (failed_type_symbol != NULL) {
659 Klass* current_class = link_info.current_klass();
660 ClassLoaderData* current_loader_data = current_class->class_loader_data();
661 assert(current_loader_data != NULL, "current class has no class loader data");
662 Klass* resolved_method_class = resolved_method->method_holder();
663 ClassLoaderData* target_loader_data = resolved_method_class->class_loader_data();
664 assert(target_loader_data != NULL, "resolved method's class has no class loader data");
665
666 stringStream ss;
667 ss.print("loader constraint violation: when resolving %s '", method_type);
668 Method::print_external_name(&ss, link_info.resolved_klass(), link_info.name(), link_info.signature());
669 ss.print("' the class loader %s of the current class, %s,"
670 " and the class loader %s for the method's defining class, %s, have"
671 " different Class objects for the type %s used in the signature (%s; %s)",
672 current_loader_data->loader_name_and_id(),
673 current_class->name()->as_C_string(),
674 target_loader_data->loader_name_and_id(),
675 resolved_method_class->name()->as_C_string(),
676 failed_type_symbol->as_C_string(),
677 current_class->class_in_module_of_loader(false, true),
678 resolved_method_class->class_in_module_of_loader(false, true));
679 THROW_MSG(vmSymbols::java_lang_LinkageError(), ss.as_string());
680 }
681}
682
683void LinkResolver::check_field_loader_constraints(Symbol* field, Symbol* sig,
684 Klass* current_klass,
685 Klass* sel_klass, TRAPS) {
686 Handle ref_loader(THREAD, current_klass->class_loader());
687 Handle sel_loader(THREAD, sel_klass->class_loader());
688
689 ResourceMark rm(THREAD); // needed for check_signature_loaders
690 Symbol* failed_type_symbol =
691 SystemDictionary::check_signature_loaders(sig,
692 ref_loader, sel_loader,
693 false,
694 CHECK);
695 if (failed_type_symbol != NULL) {
696 stringStream ss;
697 const char* failed_type_name = failed_type_symbol->as_klass_external_name();
698
699 ss.print("loader constraint violation: when resolving field \"%s\" of type %s, "
700 "the class loader %s of the current class, %s, "
701 "and the class loader %s for the field's defining %s, %s, "
702 "have different Class objects for type %s (%s; %s)",
703 field->as_C_string(),
704 failed_type_name,
705 current_klass->class_loader_data()->loader_name_and_id(),
706 current_klass->external_name(),
707 sel_klass->class_loader_data()->loader_name_and_id(),
708 sel_klass->external_kind(),
709 sel_klass->external_name(),
710 failed_type_name,
711 current_klass->class_in_module_of_loader(false, true),
712 sel_klass->class_in_module_of_loader(false, true));
713 THROW_MSG(vmSymbols::java_lang_LinkageError(), ss.as_string());
714 }
715}
716
717methodHandle LinkResolver::resolve_method(const LinkInfo& link_info,
718 Bytecodes::Code code, TRAPS) {
719
720 Handle nested_exception;
721 Klass* resolved_klass = link_info.resolved_klass();
722
723 // 1. For invokevirtual, cannot call an interface method
724 if (code == Bytecodes::_invokevirtual && resolved_klass->is_interface()) {
725 ResourceMark rm(THREAD);
726 char buf[200];
727 jio_snprintf(buf, sizeof(buf), "Found interface %s, but class was expected",
728 resolved_klass->external_name());
729 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
730 }
731
732 // 2. check constant pool tag for called method - must be JVM_CONSTANT_Methodref
733 if (!link_info.tag().is_invalid() && !link_info.tag().is_method()) {
734 ResourceMark rm(THREAD);
735 stringStream ss;
736 ss.print("Method '");
737 Method::print_external_name(&ss, link_info.resolved_klass(), link_info.name(), link_info.signature());
738 ss.print("' must be Methodref constant");
739 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
740 }
741
742 // 3. lookup method in resolved klass and its super klasses
743 methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, true, false));
744
745 // 4. lookup method in all the interfaces implemented by the resolved klass
746 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) { // not found in the class hierarchy
747 resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info));
748
749 if (resolved_method.is_null()) {
750 // JSR 292: see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc
751 resolved_method = lookup_polymorphic_method(link_info, (Handle*)NULL, THREAD);
752 if (HAS_PENDING_EXCEPTION) {
753 nested_exception = Handle(THREAD, PENDING_EXCEPTION);
754 CLEAR_PENDING_EXCEPTION;
755 }
756 }
757 }
758
759 // 5. method lookup failed
760 if (resolved_method.is_null()) {
761 ResourceMark rm(THREAD);
762 stringStream ss;
763 ss.print("'");
764 Method::print_external_name(&ss, resolved_klass, link_info.name(), link_info.signature());
765 ss.print("'");
766 THROW_MSG_CAUSE_(vmSymbols::java_lang_NoSuchMethodError(),
767 ss.as_string(), nested_exception, NULL);
768 }
769
770 // 6. access checks, access checking may be turned off when calling from within the VM.
771 Klass* current_klass = link_info.current_klass();
772 if (link_info.check_access()) {
773 assert(current_klass != NULL , "current_klass should not be null");
774
775 // check if method can be accessed by the referring class
776 check_method_accessability(current_klass,
777 resolved_klass,
778 resolved_method->method_holder(),
779 resolved_method,
780 CHECK_NULL);
781
782 // check loader constraints
783 check_method_loader_constraints(link_info, resolved_method, "method", CHECK_NULL);
784 }
785
786 return resolved_method;
787}
788
789static void trace_method_resolution(const char* prefix,
790 Klass* klass,
791 Klass* resolved_klass,
792 const methodHandle& method,
793 bool logitables,
794 int index = -1) {
795#ifndef PRODUCT
796 ResourceMark rm;
797 Log(itables) logi;
798 LogStream lsi(logi.trace());
799 Log(vtables) logv;
800 LogStream lsv(logv.trace());
801 outputStream* st;
802 if (logitables) {
803 st = &lsi;
804 } else {
805 st = &lsv;
806 }
807 st->print("%s%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ",
808 prefix,
809 (klass == NULL ? "<NULL>" : klass->internal_name()),
810 (resolved_klass == NULL ? "<NULL>" : resolved_klass->internal_name()),
811 Method::name_and_sig_as_C_string(resolved_klass,
812 method->name(),
813 method->signature()),
814 method->method_holder()->internal_name());
815 method->print_linkage_flags(st);
816 if (index != -1) {
817 st->print("vtable_index:%d", index);
818 }
819 st->cr();
820#endif // PRODUCT
821}
822
823// Do linktime resolution of a method in the interface within the context of the specied bytecode.
824methodHandle LinkResolver::resolve_interface_method(const LinkInfo& link_info, Bytecodes::Code code, TRAPS) {
825
826 Klass* resolved_klass = link_info.resolved_klass();
827
828 // check if klass is interface
829 if (!resolved_klass->is_interface()) {
830 ResourceMark rm(THREAD);
831 char buf[200];
832 jio_snprintf(buf, sizeof(buf), "Found class %s, but interface was expected", resolved_klass->external_name());
833 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
834 }
835
836 // check constant pool tag for called method - must be JVM_CONSTANT_InterfaceMethodref
837 if (!link_info.tag().is_invalid() && !link_info.tag().is_interface_method()) {
838 ResourceMark rm(THREAD);
839 stringStream ss;
840 ss.print("Method '");
841 Method::print_external_name(&ss, link_info.resolved_klass(), link_info.name(), link_info.signature());
842 ss.print("' must be InterfaceMethodref constant");
843 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
844 }
845
846 // lookup method in this interface or its super, java.lang.Object
847 // JDK8: also look for static methods
848 methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, false, true));
849
850 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) {
851 // lookup method in all the super-interfaces
852 resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info));
853 }
854
855 if (resolved_method.is_null()) {
856 // no method found
857 ResourceMark rm(THREAD);
858 stringStream ss;
859 ss.print("'");
860 Method::print_external_name(&ss, resolved_klass, link_info.name(), link_info.signature());
861 ss.print("'");
862 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), ss.as_string());
863 }
864
865 if (link_info.check_access()) {
866 // JDK8 adds non-public interface methods, and accessability check requirement
867 Klass* current_klass = link_info.current_klass();
868
869 assert(current_klass != NULL , "current_klass should not be null");
870
871 // check if method can be accessed by the referring class
872 check_method_accessability(current_klass,
873 resolved_klass,
874 resolved_method->method_holder(),
875 resolved_method,
876 CHECK_NULL);
877
878 check_method_loader_constraints(link_info, resolved_method, "interface method", CHECK_NULL);
879 }
880
881 if (code != Bytecodes::_invokestatic && resolved_method->is_static()) {
882 ResourceMark rm(THREAD);
883 stringStream ss;
884 ss.print("Expected instance not static method '");
885 Method::print_external_name(&ss, resolved_klass,
886 resolved_method->name(), resolved_method->signature());
887 ss.print("'");
888 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
889 }
890
891 if (log_develop_is_enabled(Trace, itables)) {
892 char buf[200];
893 jio_snprintf(buf, sizeof(buf), "%s resolved interface method: caller-class:",
894 Bytecodes::name(code));
895 trace_method_resolution(buf, link_info.current_klass(), resolved_klass,
896 resolved_method, true);
897 }
898
899 return resolved_method;
900}
901
902//------------------------------------------------------------------------------------------------------------------------
903// Field resolution
904
905void LinkResolver::check_field_accessability(Klass* ref_klass,
906 Klass* resolved_klass,
907 Klass* sel_klass,
908 const fieldDescriptor& fd,
909 TRAPS) {
910 bool can_access = Reflection::verify_member_access(ref_klass,
911 resolved_klass,
912 sel_klass,
913 fd.access_flags(),
914 true, false, CHECK);
915 // Any existing exceptions that may have been thrown, for example LinkageErrors
916 // from nest-host resolution, have been allowed to propagate.
917 if (!can_access) {
918 bool same_module = (sel_klass->module() == ref_klass->module());
919 ResourceMark rm(THREAD);
920 Exceptions::fthrow(
921 THREAD_AND_LOCATION,
922 vmSymbols::java_lang_IllegalAccessError(),
923 "class %s tried to access %s%sfield %s.%s (%s%s%s)",
924 ref_klass->external_name(),
925 fd.is_protected() ? "protected " : "",
926 fd.is_private() ? "private " : "",
927 sel_klass->external_name(),
928 fd.name()->as_C_string(),
929 (same_module) ? ref_klass->joint_in_module_of_loader(sel_klass) : ref_klass->class_in_module_of_loader(),
930 (same_module) ? "" : "; ",
931 (same_module) ? "" : sel_klass->class_in_module_of_loader()
932 );
933 return;
934 }
935}
936
937void LinkResolver::resolve_field_access(fieldDescriptor& fd, const constantPoolHandle& pool, int index, const methodHandle& method, Bytecodes::Code byte, TRAPS) {
938 LinkInfo link_info(pool, index, method, CHECK);
939 resolve_field(fd, link_info, byte, true, CHECK);
940}
941
942void LinkResolver::resolve_field(fieldDescriptor& fd,
943 const LinkInfo& link_info,
944 Bytecodes::Code byte, bool initialize_class,
945 TRAPS) {
946 assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic ||
947 byte == Bytecodes::_getfield || byte == Bytecodes::_putfield ||
948 byte == Bytecodes::_nofast_getfield || byte == Bytecodes::_nofast_putfield ||
949 (byte == Bytecodes::_nop && !link_info.check_access()), "bad field access bytecode");
950
951 bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic);
952 bool is_put = (byte == Bytecodes::_putfield || byte == Bytecodes::_putstatic || byte == Bytecodes::_nofast_putfield);
953 // Check if there's a resolved klass containing the field
954 Klass* resolved_klass = link_info.resolved_klass();
955 Symbol* field = link_info.name();
956 Symbol* sig = link_info.signature();
957
958 if (resolved_klass == NULL) {
959 ResourceMark rm(THREAD);
960 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
961 }
962
963 // Resolve instance field
964 Klass* sel_klass = resolved_klass->find_field(field, sig, &fd);
965 // check if field exists; i.e., if a klass containing the field def has been selected
966 if (sel_klass == NULL) {
967 ResourceMark rm(THREAD);
968 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
969 }
970
971 // Access checking may be turned off when calling from within the VM.
972 Klass* current_klass = link_info.current_klass();
973 if (link_info.check_access()) {
974
975 // check access
976 check_field_accessability(current_klass, resolved_klass, sel_klass, fd, CHECK);
977
978 // check for errors
979 if (is_static != fd.is_static()) {
980 ResourceMark rm(THREAD);
981 char msg[200];
982 jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string());
983 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg);
984 }
985
986 // A final field can be modified only
987 // (1) by methods declared in the class declaring the field and
988 // (2) by the <clinit> method (in case of a static field)
989 // or by the <init> method (in case of an instance field).
990 if (is_put && fd.access_flags().is_final()) {
991 ResourceMark rm(THREAD);
992 stringStream ss;
993
994 if (sel_klass != current_klass) {
995 ss.print("Update to %s final field %s.%s attempted from a different class (%s) than the field's declaring class",
996 is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(),
997 current_klass->external_name());
998 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
999 }
1000
1001 if (fd.constants()->pool_holder()->major_version() >= 53) {
1002 methodHandle m = link_info.current_method();
1003 assert(!m.is_null(), "information about the current method must be available for 'put' bytecodes");
1004 bool is_initialized_static_final_update = (byte == Bytecodes::_putstatic &&
1005 fd.is_static() &&
1006 !m()->is_static_initializer());
1007 bool is_initialized_instance_final_update = ((byte == Bytecodes::_putfield || byte == Bytecodes::_nofast_putfield) &&
1008 !fd.is_static() &&
1009 !m->is_object_initializer());
1010
1011 if (is_initialized_static_final_update || is_initialized_instance_final_update) {
1012 ss.print("Update to %s final field %s.%s attempted from a different method (%s) than the initializer method %s ",
1013 is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(),
1014 m()->name()->as_C_string(),
1015 is_static ? "<clinit>" : "<init>");
1016 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
1017 }
1018 }
1019 }
1020
1021 // initialize resolved_klass if necessary
1022 // note 1: the klass which declared the field must be initialized (i.e, sel_klass)
1023 // according to the newest JVM spec (5.5, p.170) - was bug (gri 7/28/99)
1024 //
1025 // note 2: we don't want to force initialization if we are just checking
1026 // if the field access is legal; e.g., during compilation
1027 if (is_static && initialize_class) {
1028 sel_klass->initialize(CHECK);
1029 }
1030 }
1031
1032 if ((sel_klass != current_klass) && (current_klass != NULL)) {
1033 check_field_loader_constraints(field, sig, current_klass, sel_klass, CHECK);
1034 }
1035
1036 // return information. note that the klass is set to the actual klass containing the
1037 // field, otherwise access of static fields in superclasses will not work.
1038}
1039
1040
1041//------------------------------------------------------------------------------------------------------------------------
1042// Invoke resolution
1043//
1044// Naming conventions:
1045//
1046// resolved_method the specified method (i.e., static receiver specified via constant pool index)
1047// sel_method the selected method (selected via run-time lookup; e.g., based on dynamic receiver class)
1048// resolved_klass the specified klass (i.e., specified via constant pool index)
1049// recv_klass the receiver klass
1050
1051
1052void LinkResolver::resolve_static_call(CallInfo& result,
1053 const LinkInfo& link_info,
1054 bool initialize_class, TRAPS) {
1055 methodHandle resolved_method = linktime_resolve_static_method(link_info, CHECK);
1056
1057 // The resolved class can change as a result of this resolution.
1058 Klass* resolved_klass = resolved_method->method_holder();
1059
1060 // Initialize klass (this should only happen if everything is ok)
1061 if (initialize_class && resolved_klass->should_be_initialized()) {
1062 resolved_klass->initialize(CHECK);
1063 // Use updated LinkInfo to reresolve with resolved method holder
1064 LinkInfo new_info(resolved_klass, link_info.name(), link_info.signature(),
1065 link_info.current_klass(),
1066 link_info.check_access() ? LinkInfo::needs_access_check : LinkInfo::skip_access_check);
1067 resolved_method = linktime_resolve_static_method(new_info, CHECK);
1068 }
1069
1070 // setup result
1071 result.set_static(resolved_klass, resolved_method, CHECK);
1072}
1073
1074// throws linktime exceptions
1075methodHandle LinkResolver::linktime_resolve_static_method(const LinkInfo& link_info, TRAPS) {
1076
1077 Klass* resolved_klass = link_info.resolved_klass();
1078 methodHandle resolved_method;
1079 if (!resolved_klass->is_interface()) {
1080 resolved_method = resolve_method(link_info, Bytecodes::_invokestatic, CHECK_NULL);
1081 } else {
1082 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokestatic, CHECK_NULL);
1083 }
1084 assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier");
1085
1086 // check if static
1087 if (!resolved_method->is_static()) {
1088 ResourceMark rm(THREAD);
1089 stringStream ss;
1090 ss.print("Expected static method '");
1091 resolved_method()->print_external_name(&ss);
1092 ss.print("'");
1093 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1094 }
1095 return resolved_method;
1096}
1097
1098
1099void LinkResolver::resolve_special_call(CallInfo& result,
1100 Handle recv,
1101 const LinkInfo& link_info,
1102 TRAPS) {
1103 methodHandle resolved_method = linktime_resolve_special_method(link_info, CHECK);
1104 runtime_resolve_special_method(result, link_info, resolved_method, recv, CHECK);
1105}
1106
1107// throws linktime exceptions
1108methodHandle LinkResolver::linktime_resolve_special_method(const LinkInfo& link_info,
1109 TRAPS) {
1110
1111 // Invokespecial is called for multiple special reasons:
1112 // <init>
1113 // local private method invocation, for classes and interfaces
1114 // superclass.method, which can also resolve to a default method
1115 // and the selected method is recalculated relative to the direct superclass
1116 // superinterface.method, which explicitly does not check shadowing
1117 Klass* resolved_klass = link_info.resolved_klass();
1118 methodHandle resolved_method;
1119
1120 if (!resolved_klass->is_interface()) {
1121 resolved_method = resolve_method(link_info, Bytecodes::_invokespecial, CHECK_NULL);
1122 } else {
1123 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokespecial, CHECK_NULL);
1124 }
1125
1126 // check if method name is <init>, that it is found in same klass as static type
1127 if (resolved_method->name() == vmSymbols::object_initializer_name() &&
1128 resolved_method->method_holder() != resolved_klass) {
1129 ResourceMark rm(THREAD);
1130 stringStream ss;
1131 ss.print("%s: method '", resolved_klass->external_name());
1132 resolved_method->signature()->print_as_signature_external_return_type(&ss);
1133 ss.print(" %s(", resolved_method->name()->as_C_string());
1134 resolved_method->signature()->print_as_signature_external_parameters(&ss);
1135 ss.print(")' not found");
1136 Exceptions::fthrow(
1137 THREAD_AND_LOCATION,
1138 vmSymbols::java_lang_NoSuchMethodError(),
1139 "%s", ss.as_string());
1140 return NULL;
1141 }
1142
1143 // ensure that invokespecial's interface method reference is in
1144 // a direct superinterface, not an indirect superinterface
1145 Klass* current_klass = link_info.current_klass();
1146 if (current_klass != NULL && resolved_klass->is_interface()) {
1147 InstanceKlass* ck = InstanceKlass::cast(current_klass);
1148 InstanceKlass *klass_to_check = !ck->is_unsafe_anonymous() ?
1149 ck :
1150 ck->unsafe_anonymous_host();
1151 // Disable verification for the dynamically-generated reflection bytecodes.
1152 bool is_reflect = klass_to_check->is_subclass_of(
1153 SystemDictionary::reflect_MagicAccessorImpl_klass());
1154
1155 if (!is_reflect &&
1156 !klass_to_check->is_same_or_direct_interface(resolved_klass)) {
1157 ResourceMark rm(THREAD);
1158 stringStream ss;
1159 ss.print("Interface method reference: '");
1160 resolved_method->print_external_name(&ss);
1161 ss.print("', is in an indirect superinterface of %s",
1162 current_klass->external_name());
1163 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1164 }
1165 }
1166
1167 // check if not static
1168 if (resolved_method->is_static()) {
1169 ResourceMark rm(THREAD);
1170 stringStream ss;
1171 ss.print("Expecting non-static method '");
1172 resolved_method->print_external_name(&ss);
1173 ss.print("'");
1174 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1175 }
1176
1177 if (log_develop_is_enabled(Trace, itables)) {
1178 trace_method_resolution("invokespecial resolved method: caller-class:",
1179 current_klass, resolved_klass, resolved_method, true);
1180 }
1181
1182 return resolved_method;
1183}
1184
1185// throws runtime exceptions
1186void LinkResolver::runtime_resolve_special_method(CallInfo& result,
1187 const LinkInfo& link_info,
1188 const methodHandle& resolved_method,
1189 Handle recv, TRAPS) {
1190
1191 Klass* resolved_klass = link_info.resolved_klass();
1192
1193 // resolved method is selected method unless we have an old-style lookup
1194 // for a superclass method
1195 // Invokespecial for a superinterface, resolved method is selected method,
1196 // no checks for shadowing
1197 methodHandle sel_method(THREAD, resolved_method());
1198
1199 if (link_info.check_access() &&
1200 // check if the method is not <init>
1201 resolved_method->name() != vmSymbols::object_initializer_name()) {
1202
1203 Klass* current_klass = link_info.current_klass();
1204
1205 // Check if the class of the resolved_klass is a superclass
1206 // (not supertype in order to exclude interface classes) of the current class.
1207 // This check is not performed for super.invoke for interface methods
1208 // in super interfaces.
1209 if (current_klass->is_subclass_of(resolved_klass) &&
1210 current_klass != resolved_klass) {
1211 // Lookup super method
1212 Klass* super_klass = current_klass->super();
1213 sel_method = lookup_instance_method_in_klasses(super_klass,
1214 resolved_method->name(),
1215 resolved_method->signature(),
1216 Klass::find_private, CHECK);
1217 // check if found
1218 if (sel_method.is_null()) {
1219 ResourceMark rm(THREAD);
1220 stringStream ss;
1221 ss.print("'");
1222 resolved_method->print_external_name(&ss);
1223 ss.print("'");
1224 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1225 // check loader constraints if found a different method
1226 } else if (sel_method() != resolved_method()) {
1227 check_method_loader_constraints(link_info, sel_method, "method", CHECK);
1228 }
1229 }
1230
1231 // Check that the class of objectref (the receiver) is the current class or interface,
1232 // or a subtype of the current class or interface (the sender), otherwise invokespecial
1233 // throws IllegalAccessError.
1234 // The verifier checks that the sender is a subtype of the class in the I/MR operand.
1235 // The verifier also checks that the receiver is a subtype of the sender, if the sender is
1236 // a class. If the sender is an interface, the check has to be performed at runtime.
1237 InstanceKlass* sender = InstanceKlass::cast(current_klass);
1238 sender = sender->is_unsafe_anonymous() ? sender->unsafe_anonymous_host() : sender;
1239 if (sender->is_interface() && recv.not_null()) {
1240 Klass* receiver_klass = recv->klass();
1241 if (!receiver_klass->is_subtype_of(sender)) {
1242 ResourceMark rm(THREAD);
1243 char buf[500];
1244 jio_snprintf(buf, sizeof(buf),
1245 "Receiver class %s must be the current class or a subtype of interface %s",
1246 receiver_klass->external_name(),
1247 sender->external_name());
1248 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), buf);
1249 }
1250 }
1251 }
1252
1253 // check if not static
1254 if (sel_method->is_static()) {
1255 ResourceMark rm(THREAD);
1256 stringStream ss;
1257 ss.print("Expecting non-static method '");
1258 resolved_method->print_external_name(&ss);
1259 ss.print("'");
1260 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1261 }
1262
1263 // check if abstract
1264 if (sel_method->is_abstract()) {
1265 ResourceMark rm(THREAD);
1266 stringStream ss;
1267 ss.print("'");
1268 Method::print_external_name(&ss, resolved_klass, sel_method->name(), sel_method->signature());
1269 ss.print("'");
1270 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1271 }
1272
1273 if (log_develop_is_enabled(Trace, itables)) {
1274 trace_method_resolution("invokespecial selected method: resolved-class:",
1275 resolved_klass, resolved_klass, sel_method, true);
1276 }
1277
1278 // setup result
1279 result.set_static(resolved_klass, sel_method, CHECK);
1280}
1281
1282void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, Klass* receiver_klass,
1283 const LinkInfo& link_info,
1284 bool check_null_and_abstract, TRAPS) {
1285 methodHandle resolved_method = linktime_resolve_virtual_method(link_info, CHECK);
1286 runtime_resolve_virtual_method(result, resolved_method,
1287 link_info.resolved_klass(),
1288 recv, receiver_klass,
1289 check_null_and_abstract, CHECK);
1290}
1291
1292// throws linktime exceptions
1293methodHandle LinkResolver::linktime_resolve_virtual_method(const LinkInfo& link_info,
1294 TRAPS) {
1295 // normal method resolution
1296 methodHandle resolved_method = resolve_method(link_info, Bytecodes::_invokevirtual, CHECK_NULL);
1297
1298 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1299 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1300
1301 // check if private interface method
1302 Klass* resolved_klass = link_info.resolved_klass();
1303 Klass* current_klass = link_info.current_klass();
1304
1305 // This is impossible, if resolve_klass is an interface, we've thrown icce in resolve_method
1306 if (resolved_klass->is_interface() && resolved_method->is_private()) {
1307 ResourceMark rm(THREAD);
1308 stringStream ss;
1309 ss.print("private interface method requires invokespecial, not invokevirtual: method '");
1310 resolved_method->print_external_name(&ss);
1311 ss.print("', caller-class: %s",
1312 (current_klass == NULL ? "<null>" : current_klass->internal_name()));
1313 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1314 }
1315
1316 // check if not static
1317 if (resolved_method->is_static()) {
1318 ResourceMark rm(THREAD);
1319 stringStream ss;
1320 ss.print("Expecting non-static method '");
1321 resolved_method->print_external_name(&ss);
1322 ss.print("'");
1323 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1324 }
1325
1326 if (log_develop_is_enabled(Trace, vtables)) {
1327 trace_method_resolution("invokevirtual resolved method: caller-class:",
1328 current_klass, resolved_klass, resolved_method, false);
1329 }
1330
1331 return resolved_method;
1332}
1333
1334// throws runtime exceptions
1335void LinkResolver::runtime_resolve_virtual_method(CallInfo& result,
1336 const methodHandle& resolved_method,
1337 Klass* resolved_klass,
1338 Handle recv,
1339 Klass* recv_klass,
1340 bool check_null_and_abstract,
1341 TRAPS) {
1342
1343 // setup default return values
1344 int vtable_index = Method::invalid_vtable_index;
1345 methodHandle selected_method;
1346
1347 // runtime method resolution
1348 if (check_null_and_abstract && recv.is_null()) { // check if receiver exists
1349 THROW(vmSymbols::java_lang_NullPointerException());
1350 }
1351
1352 // Virtual methods cannot be resolved before its klass has been linked, for otherwise the Method*'s
1353 // has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since
1354 // a missing receiver might result in a bogus lookup.
1355 assert(resolved_method->method_holder()->is_linked(), "must be linked");
1356
1357 // do lookup based on receiver klass using the vtable index
1358 if (resolved_method->method_holder()->is_interface()) { // default or miranda method
1359 vtable_index = vtable_index_of_interface_method(resolved_klass, resolved_method);
1360 assert(vtable_index >= 0 , "we should have valid vtable index at this point");
1361
1362 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1363 } else {
1364 // at this point we are sure that resolved_method is virtual and not
1365 // a default or miranda method; therefore, it must have a valid vtable index.
1366 assert(!resolved_method->has_itable_index(), "");
1367 vtable_index = resolved_method->vtable_index();
1368 // We could get a negative vtable_index of nonvirtual_vtable_index for private
1369 // methods, or for final methods. Private methods never appear in the vtable
1370 // and never override other methods. As an optimization, final methods are
1371 // never put in the vtable, unless they override an existing method.
1372 // So if we do get nonvirtual_vtable_index, it means the selected method is the
1373 // resolved method, and it can never be changed by an override.
1374 if (vtable_index == Method::nonvirtual_vtable_index) {
1375 assert(resolved_method->can_be_statically_bound(), "cannot override this method");
1376 selected_method = resolved_method;
1377 } else {
1378 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1379 }
1380 }
1381
1382 // check if method exists
1383 if (selected_method.is_null()) {
1384 throw_abstract_method_error(resolved_method, recv_klass, CHECK);
1385 }
1386
1387 // check if abstract
1388 if (check_null_and_abstract && selected_method->is_abstract()) {
1389 // Pass arguments for generating a verbose error message.
1390 throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK);
1391 }
1392
1393 if (log_develop_is_enabled(Trace, vtables)) {
1394 trace_method_resolution("invokevirtual selected method: receiver-class:",
1395 recv_klass, resolved_klass, selected_method,
1396 false, vtable_index);
1397 }
1398 // setup result
1399 result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK);
1400}
1401
1402void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, Klass* recv_klass,
1403 const LinkInfo& link_info,
1404 bool check_null_and_abstract, TRAPS) {
1405 // throws linktime exceptions
1406 methodHandle resolved_method = linktime_resolve_interface_method(link_info, CHECK);
1407 runtime_resolve_interface_method(result, resolved_method,link_info.resolved_klass(),
1408 recv, recv_klass, check_null_and_abstract, CHECK);
1409}
1410
1411methodHandle LinkResolver::linktime_resolve_interface_method(const LinkInfo& link_info,
1412 TRAPS) {
1413 // normal interface method resolution
1414 methodHandle resolved_method = resolve_interface_method(link_info, Bytecodes::_invokeinterface, CHECK_NULL);
1415 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1416 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1417
1418 return resolved_method;
1419}
1420
1421// throws runtime exceptions
1422void LinkResolver::runtime_resolve_interface_method(CallInfo& result,
1423 const methodHandle& resolved_method,
1424 Klass* resolved_klass,
1425 Handle recv,
1426 Klass* recv_klass,
1427 bool check_null_and_abstract, TRAPS) {
1428
1429 // check if receiver exists
1430 if (check_null_and_abstract && recv.is_null()) {
1431 THROW(vmSymbols::java_lang_NullPointerException());
1432 }
1433
1434 // check if receiver klass implements the resolved interface
1435 if (!recv_klass->is_subtype_of(resolved_klass)) {
1436 ResourceMark rm(THREAD);
1437 char buf[200];
1438 jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s",
1439 recv_klass->external_name(),
1440 resolved_klass->external_name());
1441 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1442 }
1443
1444 methodHandle selected_method = resolved_method;
1445
1446 // resolve the method in the receiver class, unless it is private
1447 if (!resolved_method()->is_private()) {
1448 // do lookup based on receiver klass
1449 // This search must match the linktime preparation search for itable initialization
1450 // to correctly enforce loader constraints for interface method inheritance.
1451 // Private methods are skipped as the resolved method was not private.
1452 selected_method = lookup_instance_method_in_klasses(recv_klass,
1453 resolved_method->name(),
1454 resolved_method->signature(),
1455 Klass::skip_private, CHECK);
1456
1457 if (selected_method.is_null() && !check_null_and_abstract) {
1458 // In theory this is a harmless placeholder value, but
1459 // in practice leaving in null affects the nsk default method tests.
1460 // This needs further study.
1461 selected_method = resolved_method;
1462 }
1463 // check if method exists
1464 if (selected_method.is_null()) {
1465 // Pass arguments for generating a verbose error message.
1466 throw_abstract_method_error(resolved_method, recv_klass, CHECK);
1467 }
1468 // check access
1469 // Throw Illegal Access Error if selected_method is not public.
1470 if (!selected_method->is_public()) {
1471 ResourceMark rm(THREAD);
1472 stringStream ss;
1473 ss.print("'");
1474 Method::print_external_name(&ss, recv_klass, selected_method->name(), selected_method->signature());
1475 ss.print("'");
1476 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
1477 }
1478 // check if abstract
1479 if (check_null_and_abstract && selected_method->is_abstract()) {
1480 throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK);
1481 }
1482 }
1483
1484 if (log_develop_is_enabled(Trace, itables)) {
1485 trace_method_resolution("invokeinterface selected method: receiver-class:",
1486 recv_klass, resolved_klass, selected_method, true);
1487 }
1488 // setup result
1489 if (resolved_method->has_vtable_index()) {
1490 int vtable_index = resolved_method->vtable_index();
1491 log_develop_trace(itables)(" -- vtable index: %d", vtable_index);
1492 assert(vtable_index == selected_method->vtable_index(), "sanity check");
1493 result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK);
1494 } else if (resolved_method->has_itable_index()) {
1495 int itable_index = resolved_method()->itable_index();
1496 log_develop_trace(itables)(" -- itable index: %d", itable_index);
1497 result.set_interface(resolved_klass, recv_klass, resolved_method, selected_method, itable_index, CHECK);
1498 } else {
1499 int index = resolved_method->vtable_index();
1500 log_develop_trace(itables)(" -- non itable/vtable index: %d", index);
1501 assert(index == Method::nonvirtual_vtable_index, "Oops hit another case!");
1502 assert(resolved_method()->is_private() ||
1503 (resolved_method()->is_final() && resolved_method->method_holder() == SystemDictionary::Object_klass()),
1504 "Should only have non-virtual invokeinterface for private or final-Object methods!");
1505 assert(resolved_method()->can_be_statically_bound(), "Should only have non-virtual invokeinterface for statically bound methods!");
1506 // This sets up the nonvirtual form of "virtual" call (as needed for final and private methods)
1507 result.set_virtual(resolved_klass, resolved_klass, resolved_method, resolved_method, index, CHECK);
1508 }
1509}
1510
1511
1512methodHandle LinkResolver::linktime_resolve_interface_method_or_null(
1513 const LinkInfo& link_info) {
1514 EXCEPTION_MARK;
1515 methodHandle method_result = linktime_resolve_interface_method(link_info, THREAD);
1516 if (HAS_PENDING_EXCEPTION) {
1517 CLEAR_PENDING_EXCEPTION;
1518 return methodHandle();
1519 } else {
1520 return method_result;
1521 }
1522}
1523
1524methodHandle LinkResolver::linktime_resolve_virtual_method_or_null(
1525 const LinkInfo& link_info) {
1526 EXCEPTION_MARK;
1527 methodHandle method_result = linktime_resolve_virtual_method(link_info, THREAD);
1528 if (HAS_PENDING_EXCEPTION) {
1529 CLEAR_PENDING_EXCEPTION;
1530 return methodHandle();
1531 } else {
1532 return method_result;
1533 }
1534}
1535
1536methodHandle LinkResolver::resolve_virtual_call_or_null(
1537 Klass* receiver_klass,
1538 const LinkInfo& link_info) {
1539 EXCEPTION_MARK;
1540 CallInfo info;
1541 resolve_virtual_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1542 if (HAS_PENDING_EXCEPTION) {
1543 CLEAR_PENDING_EXCEPTION;
1544 return methodHandle();
1545 }
1546 return info.selected_method();
1547}
1548
1549methodHandle LinkResolver::resolve_interface_call_or_null(
1550 Klass* receiver_klass,
1551 const LinkInfo& link_info) {
1552 EXCEPTION_MARK;
1553 CallInfo info;
1554 resolve_interface_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1555 if (HAS_PENDING_EXCEPTION) {
1556 CLEAR_PENDING_EXCEPTION;
1557 return methodHandle();
1558 }
1559 return info.selected_method();
1560}
1561
1562int LinkResolver::resolve_virtual_vtable_index(Klass* receiver_klass,
1563 const LinkInfo& link_info) {
1564 EXCEPTION_MARK;
1565 CallInfo info;
1566 resolve_virtual_call(info, Handle(), receiver_klass, link_info,
1567 /*check_null_or_abstract*/false, THREAD);
1568 if (HAS_PENDING_EXCEPTION) {
1569 CLEAR_PENDING_EXCEPTION;
1570 return Method::invalid_vtable_index;
1571 }
1572 return info.vtable_index();
1573}
1574
1575methodHandle LinkResolver::resolve_static_call_or_null(const LinkInfo& link_info) {
1576 EXCEPTION_MARK;
1577 CallInfo info;
1578 resolve_static_call(info, link_info, /*initialize_class*/false, THREAD);
1579 if (HAS_PENDING_EXCEPTION) {
1580 CLEAR_PENDING_EXCEPTION;
1581 return methodHandle();
1582 }
1583 return info.selected_method();
1584}
1585
1586methodHandle LinkResolver::resolve_special_call_or_null(const LinkInfo& link_info) {
1587 EXCEPTION_MARK;
1588 CallInfo info;
1589 resolve_special_call(info, Handle(), link_info, THREAD);
1590 if (HAS_PENDING_EXCEPTION) {
1591 CLEAR_PENDING_EXCEPTION;
1592 return methodHandle();
1593 }
1594 return info.selected_method();
1595}
1596
1597
1598
1599//------------------------------------------------------------------------------------------------------------------------
1600// ConstantPool entries
1601
1602void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) {
1603 switch (byte) {
1604 case Bytecodes::_invokestatic : resolve_invokestatic (result, pool, index, CHECK); break;
1605 case Bytecodes::_invokespecial : resolve_invokespecial (result, recv, pool, index, CHECK); break;
1606 case Bytecodes::_invokevirtual : resolve_invokevirtual (result, recv, pool, index, CHECK); break;
1607 case Bytecodes::_invokehandle : resolve_invokehandle (result, pool, index, CHECK); break;
1608 case Bytecodes::_invokedynamic : resolve_invokedynamic (result, pool, index, CHECK); break;
1609 case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break;
1610 default : break;
1611 }
1612 return;
1613}
1614
1615void LinkResolver::resolve_invoke(CallInfo& result, Handle& recv,
1616 const methodHandle& attached_method,
1617 Bytecodes::Code byte, TRAPS) {
1618 Klass* defc = attached_method->method_holder();
1619 Symbol* name = attached_method->name();
1620 Symbol* type = attached_method->signature();
1621 LinkInfo link_info(defc, name, type);
1622 switch(byte) {
1623 case Bytecodes::_invokevirtual:
1624 resolve_virtual_call(result, recv, recv->klass(), link_info,
1625 /*check_null_and_abstract=*/true, CHECK);
1626 break;
1627 case Bytecodes::_invokeinterface:
1628 resolve_interface_call(result, recv, recv->klass(), link_info,
1629 /*check_null_and_abstract=*/true, CHECK);
1630 break;
1631 case Bytecodes::_invokestatic:
1632 resolve_static_call(result, link_info, /*initialize_class=*/false, CHECK);
1633 break;
1634 case Bytecodes::_invokespecial:
1635 resolve_special_call(result, recv, link_info, CHECK);
1636 break;
1637 default:
1638 fatal("bad call: %s", Bytecodes::name(byte));
1639 break;
1640 }
1641}
1642
1643void LinkResolver::resolve_invokestatic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1644 LinkInfo link_info(pool, index, CHECK);
1645 resolve_static_call(result, link_info, /*initialize_class*/true, CHECK);
1646}
1647
1648
1649void LinkResolver::resolve_invokespecial(CallInfo& result, Handle recv,
1650 const constantPoolHandle& pool, int index, TRAPS) {
1651 LinkInfo link_info(pool, index, CHECK);
1652 resolve_special_call(result, recv, link_info, CHECK);
1653}
1654
1655
1656void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv,
1657 const constantPoolHandle& pool, int index,
1658 TRAPS) {
1659
1660 LinkInfo link_info(pool, index, CHECK);
1661 Klass* recvrKlass = recv.is_null() ? (Klass*)NULL : recv->klass();
1662 resolve_virtual_call(result, recv, recvrKlass, link_info, /*check_null_or_abstract*/true, CHECK);
1663}
1664
1665
1666void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, TRAPS) {
1667 LinkInfo link_info(pool, index, CHECK);
1668 Klass* recvrKlass = recv.is_null() ? (Klass*)NULL : recv->klass();
1669 resolve_interface_call(result, recv, recvrKlass, link_info, true, CHECK);
1670}
1671
1672
1673void LinkResolver::resolve_invokehandle(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1674 // This guy is reached from InterpreterRuntime::resolve_invokehandle.
1675 LinkInfo link_info(pool, index, CHECK);
1676 if (TraceMethodHandles) {
1677 ResourceMark rm(THREAD);
1678 tty->print_cr("resolve_invokehandle %s %s", link_info.name()->as_C_string(),
1679 link_info.signature()->as_C_string());
1680 }
1681 resolve_handle_call(result, link_info, CHECK);
1682}
1683
1684void LinkResolver::resolve_handle_call(CallInfo& result,
1685 const LinkInfo& link_info,
1686 TRAPS) {
1687 // JSR 292: this must be an implicitly generated method MethodHandle.invokeExact(*...) or similar
1688 Klass* resolved_klass = link_info.resolved_klass();
1689 assert(resolved_klass == SystemDictionary::MethodHandle_klass() ||
1690 resolved_klass == SystemDictionary::VarHandle_klass(), "");
1691 assert(MethodHandles::is_signature_polymorphic_name(link_info.name()), "");
1692 Handle resolved_appendix;
1693 methodHandle resolved_method = lookup_polymorphic_method(link_info, &resolved_appendix, CHECK);
1694 result.set_handle(resolved_klass, resolved_method, resolved_appendix, CHECK);
1695}
1696
1697void LinkResolver::resolve_invokedynamic(CallInfo& result, const constantPoolHandle& pool, int indy_index, TRAPS) {
1698 ConstantPoolCacheEntry* cpce = pool->invokedynamic_cp_cache_entry_at(indy_index);
1699 int pool_index = cpce->constant_pool_index();
1700
1701 // Resolve the bootstrap specifier (BSM + optional arguments).
1702 BootstrapInfo bootstrap_specifier(pool, pool_index, indy_index);
1703
1704 // Check if CallSite has been bound already or failed already, and short circuit:
1705 {
1706 bool is_done = bootstrap_specifier.resolve_previously_linked_invokedynamic(result, CHECK);
1707 if (is_done) return;
1708 }
1709
1710 // The initial step in Call Site Specifier Resolution is to resolve the symbolic
1711 // reference to a method handle which will be the bootstrap method for a dynamic
1712 // call site. If resolution for the java.lang.invoke.MethodHandle for the bootstrap
1713 // method fails, then a MethodHandleInError is stored at the corresponding bootstrap
1714 // method's CP index for the CONSTANT_MethodHandle_info. So, there is no need to
1715 // set the indy_rf flag since any subsequent invokedynamic instruction which shares
1716 // this bootstrap method will encounter the resolution of MethodHandleInError.
1717
1718 resolve_dynamic_call(result, bootstrap_specifier, CHECK);
1719
1720 if (TraceMethodHandles) {
1721 bootstrap_specifier.print_msg_on(tty, "resolve_invokedynamic");
1722 }
1723
1724 // The returned linkage result is provisional up to the moment
1725 // the interpreter or runtime performs a serialized check of
1726 // the relevant CPCE::f1 field. This is done by the caller
1727 // of this method, via CPCE::set_dynamic_call, which uses
1728 // an ObjectLocker to do the final serialization of updates
1729 // to CPCE state, including f1.
1730}
1731
1732void LinkResolver::resolve_dynamic_call(CallInfo& result,
1733 BootstrapInfo& bootstrap_specifier,
1734 TRAPS) {
1735 // JSR 292: this must resolve to an implicitly generated method
1736 // such as MH.linkToCallSite(*...) or some other call-site shape.
1737 // The appendix argument is likely to be a freshly-created CallSite.
1738 // It may also be a MethodHandle from an unwrapped ConstantCallSite,
1739 // or any other reference. The resolved_method as well as the appendix
1740 // are both recorded together via CallInfo::set_handle.
1741 SystemDictionary::invoke_bootstrap_method(bootstrap_specifier, THREAD);
1742 Exceptions::wrap_dynamic_exception(THREAD);
1743
1744 if (HAS_PENDING_EXCEPTION) {
1745 if (!PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1746 // Let any random low-level IE or SOE or OOME just bleed through.
1747 // Basically we pretend that the bootstrap method was never called,
1748 // if it fails this way: We neither record a successful linkage,
1749 // nor do we memorize a LE for posterity.
1750 return;
1751 }
1752 // JVMS 5.4.3 says: If an attempt by the Java Virtual Machine to resolve
1753 // a symbolic reference fails because an error is thrown that is an
1754 // instance of LinkageError (or a subclass), then subsequent attempts to
1755 // resolve the reference always fail with the same error that was thrown
1756 // as a result of the initial resolution attempt.
1757 bool recorded_res_status = bootstrap_specifier.save_and_throw_indy_exc(CHECK);
1758 if (!recorded_res_status) {
1759 // Another thread got here just before we did. So, either use the method
1760 // that it resolved or throw the LinkageError exception that it threw.
1761 bool is_done = bootstrap_specifier.resolve_previously_linked_invokedynamic(result, CHECK);
1762 if (is_done) return;
1763 }
1764 assert(bootstrap_specifier.invokedynamic_cp_cache_entry()->indy_resolution_failed(),
1765 "Resolution failure flag wasn't set");
1766 }
1767
1768 bootstrap_specifier.resolve_newly_linked_invokedynamic(result, CHECK);
1769 // Exceptions::wrap_dynamic_exception not used because
1770 // set_handle doesn't throw linkage errors
1771}
1772
1773// Selected method is abstract.
1774void LinkResolver::throw_abstract_method_error(const methodHandle& resolved_method,
1775 const methodHandle& selected_method,
1776 Klass *recv_klass, TRAPS) {
1777 Klass *resolved_klass = resolved_method->method_holder();
1778 ResourceMark rm(THREAD);
1779 stringStream ss;
1780
1781 if (recv_klass != NULL) {
1782 ss.print("Receiver class %s does not define or inherit an "
1783 "implementation of the",
1784 recv_klass->external_name());
1785 } else {
1786 ss.print("Missing implementation of");
1787 }
1788
1789 assert(resolved_method.not_null(), "Sanity");
1790 ss.print(" resolved method '%s%s",
1791 resolved_method->is_abstract() ? "abstract " : "",
1792 resolved_method->is_private() ? "private " : "");
1793 resolved_method->signature()->print_as_signature_external_return_type(&ss);
1794 ss.print(" %s(", resolved_method->name()->as_C_string());
1795 resolved_method->signature()->print_as_signature_external_parameters(&ss);
1796 ss.print(")' of %s %s.",
1797 resolved_klass->external_kind(),
1798 resolved_klass->external_name());
1799
1800 if (selected_method.not_null() && !(resolved_method == selected_method)) {
1801 ss.print(" Selected method is '%s%s",
1802 selected_method->is_abstract() ? "abstract " : "",
1803 selected_method->is_private() ? "private " : "");
1804 selected_method->print_external_name(&ss);
1805 ss.print("'.");
1806 }
1807
1808 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1809}
1810