1 /*
2 * Copyright (c) 1997, 2016, 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 "classfile/defaultMethods.hpp"
27 #include "classfile/symbolTable.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "compiler/compileBroker.hpp"
31 #include "gc/shared/collectedHeap.inline.hpp"
32 #include "interpreter/bytecode.hpp"
33 #include "interpreter/interpreterRuntime.hpp"
34 #include "interpreter/linkResolver.hpp"
35 #include "logging/log.hpp"
36 #include "memory/resourceArea.hpp"
37 #include "memory/universe.inline.hpp"
38 #include "oops/instanceKlass.hpp"
39 #include "oops/method.hpp"
40 #include "oops/objArrayOop.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "prims/methodHandles.hpp"
43 #include "prims/nativeLookup.hpp"
44 #include "runtime/compilationPolicy.hpp"
45 #include "runtime/fieldDescriptor.hpp"
46 #include "runtime/frame.inline.hpp"
47 #include "runtime/handles.inline.hpp"
48 #include "runtime/reflection.hpp"
49 #include "runtime/signature.hpp"
50 #include "runtime/thread.inline.hpp"
51 #include "runtime/vmThread.hpp"
52
53
54 //------------------------------------------------------------------------------------------------------------------------
55 // Implementation of CallInfo
56
57
58 void CallInfo::set_static(KlassHandle resolved_klass, const methodHandle& resolved_method, TRAPS) {
59 int vtable_index = Method::nonvirtual_vtable_index;
60 set_common(resolved_klass, resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK);
61 }
62
63
64 void CallInfo::set_interface(KlassHandle resolved_klass,
65 KlassHandle selected_klass,
66 const methodHandle& resolved_method,
67 const methodHandle& selected_method,
68 int itable_index, TRAPS) {
69 // This is only called for interface methods. If the resolved_method
70 // comes from java/lang/Object, it can be the subject of a virtual call, so
71 // we should pick the vtable index from the resolved method.
72 // In that case, the caller must call set_virtual instead of set_interface.
73 assert(resolved_method->method_holder()->is_interface(), "");
74 assert(itable_index == resolved_method()->itable_index(), "");
75 set_common(resolved_klass, selected_klass, resolved_method, selected_method, CallInfo::itable_call, itable_index, CHECK);
76 }
77
78 void CallInfo::set_virtual(KlassHandle resolved_klass,
79 KlassHandle selected_klass,
80 const methodHandle& resolved_method,
81 const methodHandle& selected_method,
82 int vtable_index, TRAPS) {
83 assert(vtable_index >= 0 || vtable_index == Method::nonvirtual_vtable_index, "valid index");
84 assert(vtable_index < 0 || !resolved_method->has_vtable_index() || vtable_index == resolved_method->vtable_index(), "");
85 CallKind kind = (vtable_index >= 0 && !resolved_method->can_be_statically_bound() ? CallInfo::vtable_call : CallInfo::direct_call);
86 set_common(resolved_klass, selected_klass, resolved_method, selected_method, kind, vtable_index, CHECK);
87 assert(!resolved_method->is_compiled_lambda_form(), "these must be handled via an invokehandle call");
88 }
89
90 void CallInfo::set_handle(const methodHandle& resolved_method,
91 Handle resolved_appendix,
92 Handle resolved_method_type, TRAPS) {
93 set_handle(SystemDictionary::MethodHandle_klass(), resolved_method, resolved_appendix, resolved_method_type, CHECK);
94 }
95
96 void CallInfo::set_handle(KlassHandle resolved_klass,
97 const methodHandle& resolved_method,
98 Handle resolved_appendix,
99 Handle resolved_method_type, TRAPS) {
100 if (resolved_method.is_null()) {
101 THROW_MSG(vmSymbols::java_lang_InternalError(), "resolved method is null");
102 }
103 assert(resolved_method->intrinsic_id() == vmIntrinsics::_invokeBasic ||
104 resolved_method->is_compiled_lambda_form(),
105 "linkMethod must return one of these");
106 int vtable_index = Method::nonvirtual_vtable_index;
107 assert(!resolved_method->has_vtable_index(), "");
108 set_common(resolved_klass, resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK);
109 _resolved_appendix = resolved_appendix;
110 _resolved_method_type = resolved_method_type;
111 }
112
113 void CallInfo::set_common(KlassHandle resolved_klass,
114 KlassHandle selected_klass,
115 const methodHandle& resolved_method,
116 const methodHandle& selected_method,
117 CallKind kind,
118 int index,
119 TRAPS) {
120 assert(resolved_method->signature() == selected_method->signature(), "signatures must correspond");
121 _resolved_klass = resolved_klass;
122 _selected_klass = selected_klass;
123 _resolved_method = resolved_method;
124 _selected_method = selected_method;
125 _call_kind = kind;
126 _call_index = index;
127 _resolved_appendix = Handle();
128 DEBUG_ONLY(verify()); // verify before making side effects
129
130 CompilationPolicy::compile_if_required(selected_method, THREAD);
131 }
132
133 // utility query for unreflecting a method
134 CallInfo::CallInfo(Method* resolved_method, Klass* resolved_klass) {
135 Klass* resolved_method_holder = resolved_method->method_holder();
136 if (resolved_klass == NULL) { // 2nd argument defaults to holder of 1st
137 resolved_klass = resolved_method_holder;
138 }
139 _resolved_klass = resolved_klass;
140 _selected_klass = resolved_klass;
141 _resolved_method = resolved_method;
142 _selected_method = resolved_method;
143 // classify:
144 CallKind kind = CallInfo::unknown_kind;
145 int index = resolved_method->vtable_index();
146 if (resolved_method->can_be_statically_bound()) {
147 kind = CallInfo::direct_call;
148 } else if (!resolved_method_holder->is_interface()) {
149 // Could be an Object method inherited into an interface, but still a vtable call.
150 kind = CallInfo::vtable_call;
151 } else if (!resolved_klass->is_interface()) {
152 // A default or miranda method. Compute the vtable index.
153 ResourceMark rm;
154 klassVtable* vt = resolved_klass->vtable();
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 KlassHandle 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 DEBUG_ONLY(verify());
186 }
187
188 #ifdef ASSERT
189 void CallInfo::verify() {
190 switch (call_kind()) { // the meaning and allowed value of index depends on kind
191 case CallInfo::direct_call:
192 if (_call_index == Method::nonvirtual_vtable_index) break;
193 // else fall through to check vtable index:
194 case CallInfo::vtable_call:
195 assert(resolved_klass()->verify_vtable_index(_call_index), "");
196 break;
197 case CallInfo::itable_call:
198 assert(resolved_method()->method_holder()->verify_itable_index(_call_index), "");
199 break;
200 case CallInfo::unknown_kind:
201 assert(call_kind() != CallInfo::unknown_kind, "CallInfo must be set");
202 break;
203 default:
204 fatal("Unexpected call kind %d", call_kind());
205 }
206 }
207 #endif //ASSERT
208
209 #ifndef PRODUCT
210 void CallInfo::print() {
211 ResourceMark rm;
212 const char* kindstr = "unknown";
213 switch (_call_kind) {
214 case direct_call: kindstr = "direct"; break;
215 case vtable_call: kindstr = "vtable"; break;
216 case itable_call: kindstr = "itable"; break;
217 }
218 tty->print_cr("Call %s@%d %s", kindstr, _call_index,
219 _resolved_method.is_null() ? "(none)" : _resolved_method->name_and_sig_as_C_string());
220 }
221 #endif
222
223 //------------------------------------------------------------------------------------------------------------------------
224 // Implementation of LinkInfo
225
226 LinkInfo::LinkInfo(const constantPoolHandle& pool, int index, TRAPS) {
227 // resolve klass
228 Klass* result = pool->klass_ref_at(index, CHECK);
229 _resolved_klass = KlassHandle(THREAD, result);
230
231 // Get name, signature, and static klass
232 _name = pool->name_ref_at(index);
233 _signature = pool->signature_ref_at(index);
234 _tag = pool->tag_ref_at(index);
235 _current_klass = KlassHandle(THREAD, pool->pool_holder());
236
237 // Coming from the constant pool always checks access
238 _check_access = true;
239 }
240
241 char* LinkInfo::method_string() const {
242 return Method::name_and_sig_as_C_string(_resolved_klass(), _name, _signature);
243 }
244
245 #ifndef PRODUCT
246 void LinkInfo::print() {
247 ResourceMark rm;
248 tty->print_cr("Link resolved_klass=%s name=%s signature=%s current_klass=%s check_access=%s",
249 _resolved_klass->name()->as_C_string(),
250 _name->as_C_string(),
251 _signature->as_C_string(),
252 _current_klass.is_null() ? "(none)" : _current_klass->name()->as_C_string(),
253 _check_access ? "true" : "false");
254 }
255 #endif // PRODUCT
256 //------------------------------------------------------------------------------------------------------------------------
257 // Klass resolution
258
259 void LinkResolver::check_klass_accessability(KlassHandle ref_klass, KlassHandle sel_klass, TRAPS) {
260 Reflection::VerifyClassAccessResults vca_result =
261 Reflection::verify_class_access(ref_klass(), sel_klass(), true);
262 if (vca_result != Reflection::ACCESS_OK) {
263 ResourceMark rm(THREAD);
264 char* msg = Reflection::verify_class_access_msg(ref_klass(), sel_klass(), vca_result);
265 if (msg == NULL) {
266 Exceptions::fthrow(
267 THREAD_AND_LOCATION,
268 vmSymbols::java_lang_IllegalAccessError(),
269 "failed to access class %s from class %s",
270 sel_klass->external_name(),
271 ref_klass->external_name());
272 } else {
273 // Use module specific message returned by verify_class_access_msg().
274 Exceptions::fthrow(
275 THREAD_AND_LOCATION,
276 vmSymbols::java_lang_IllegalAccessError(),
277 "%s", msg);
278 }
279 }
280 }
281
282 //------------------------------------------------------------------------------------------------------------------------
283 // Method resolution
284 //
285 // According to JVM spec. $5.4.3c & $5.4.3d
286
287 // Look up method in klasses, including static methods
288 // Then look up local default methods
289 methodHandle LinkResolver::lookup_method_in_klasses(const LinkInfo& link_info,
290 bool checkpolymorphism,
291 bool in_imethod_resolve, TRAPS) {
292 KlassHandle klass = link_info.resolved_klass();
293 Symbol* name = link_info.name();
294 Symbol* signature = link_info.signature();
295
296 // Ignore overpasses so statics can be found during resolution
297 Method* result = klass->uncached_lookup_method(name, signature, Klass::skip_overpass);
298
299 if (klass->is_array_klass()) {
300 // Only consider klass and super klass for arrays
301 return methodHandle(THREAD, result);
302 }
303
304 InstanceKlass* ik = InstanceKlass::cast(klass());
305
306 // JDK 8, JVMS 5.4.3.4: Interface method resolution should
307 // ignore static and non-public methods of java.lang.Object,
308 // like clone, finalize, registerNatives.
309 if (in_imethod_resolve &&
310 result != NULL &&
311 ik->is_interface() &&
312 (result->is_static() || !result->is_public()) &&
313 result->method_holder() == SystemDictionary::Object_klass()) {
314 result = NULL;
315 }
316
317 // Before considering default methods, check for an overpass in the
318 // current class if a method has not been found.
319 if (result == NULL) {
320 result = ik->find_method(name, signature);
321 }
322
323 if (result == NULL) {
324 Array<Method*>* default_methods = ik->default_methods();
325 if (default_methods != NULL) {
326 result = InstanceKlass::find_method(default_methods, name, signature);
327 }
328 }
329
330 if (checkpolymorphism && result != NULL) {
331 vmIntrinsics::ID iid = result->intrinsic_id();
332 if (MethodHandles::is_signature_polymorphic(iid)) {
333 // Do not link directly to these. The VM must produce a synthetic one using lookup_polymorphic_method.
334 return NULL;
335 }
336 }
337 return methodHandle(THREAD, result);
338 }
339
340 // returns first instance method
341 // Looks up method in classes, then looks up local default methods
342 methodHandle LinkResolver::lookup_instance_method_in_klasses(KlassHandle klass,
343 Symbol* name,
344 Symbol* signature, TRAPS) {
345 Method* result = klass->uncached_lookup_method(name, signature, Klass::find_overpass);
346
347 while (result != NULL && result->is_static() && result->method_holder()->super() != NULL) {
348 Klass* super_klass = result->method_holder()->super();
349 result = super_klass->uncached_lookup_method(name, signature, Klass::find_overpass);
350 }
351
352 if (klass->is_array_klass()) {
353 // Only consider klass and super klass for arrays
354 return methodHandle(THREAD, result);
355 }
356
357 if (result == NULL) {
358 Array<Method*>* default_methods = InstanceKlass::cast(klass())->default_methods();
359 if (default_methods != NULL) {
360 result = InstanceKlass::find_method(default_methods, name, signature);
361 assert(result == NULL || !result->is_static(), "static defaults not allowed");
362 }
363 }
364 return methodHandle(THREAD, result);
365 }
366
367 int LinkResolver::vtable_index_of_interface_method(KlassHandle klass,
368 const methodHandle& resolved_method) {
369
370 int vtable_index = Method::invalid_vtable_index;
371 Symbol* name = resolved_method->name();
372 Symbol* signature = resolved_method->signature();
373 InstanceKlass* ik = InstanceKlass::cast(klass());
374
375 // First check in default method array
376 if (!resolved_method->is_abstract() && ik->default_methods() != NULL) {
377 int index = InstanceKlass::find_method_index(ik->default_methods(),
378 name, signature, Klass::find_overpass,
379 Klass::find_static, Klass::find_private);
380 if (index >= 0 ) {
381 vtable_index = ik->default_vtable_indices()->at(index);
382 }
383 }
384 if (vtable_index == Method::invalid_vtable_index) {
385 // get vtable_index for miranda methods
386 ResourceMark rm;
387 klassVtable *vt = ik->vtable();
388 vtable_index = vt->index_of_miranda(name, signature);
389 }
390 return vtable_index;
391 }
392
393 methodHandle LinkResolver::lookup_method_in_interfaces(const LinkInfo& cp_info, TRAPS) {
394 InstanceKlass *ik = InstanceKlass::cast(cp_info.resolved_klass()());
395
396 // Specify 'true' in order to skip default methods when searching the
397 // interfaces. Function lookup_method_in_klasses() already looked for
398 // the method in the default methods table.
399 return methodHandle(THREAD,
400 ik->lookup_method_in_all_interfaces(cp_info.name(), cp_info.signature(),
401 Klass::skip_defaults));
402 }
403
404 methodHandle LinkResolver::lookup_polymorphic_method(
405 const LinkInfo& link_info,
406 Handle *appendix_result_or_null,
407 Handle *method_type_result,
408 TRAPS) {
409 KlassHandle klass = link_info.resolved_klass();
410 Symbol* name = link_info.name();
411 Symbol* full_signature = link_info.signature();
412
413 vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name);
414 if (TraceMethodHandles) {
415 ResourceMark rm(THREAD);
416 tty->print_cr("lookup_polymorphic_method iid=%s %s.%s%s",
417 vmIntrinsics::name_at(iid), klass->external_name(),
418 name->as_C_string(), full_signature->as_C_string());
419 }
420 if ((klass() == SystemDictionary::MethodHandle_klass() ||
421 klass() == SystemDictionary::VarHandle_klass()) &&
422 iid != vmIntrinsics::_none) {
423 if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) {
424 // Most of these do not need an up-call to Java to resolve, so can be done anywhere.
425 // Do not erase last argument type (MemberName) if it is a static linkTo method.
426 bool keep_last_arg = MethodHandles::is_signature_polymorphic_static(iid);
427 TempNewSymbol basic_signature =
428 MethodHandles::lookup_basic_type_signature(full_signature, keep_last_arg, CHECK_NULL);
429 if (TraceMethodHandles) {
430 ResourceMark rm(THREAD);
431 tty->print_cr("lookup_polymorphic_method %s %s => basic %s",
432 name->as_C_string(),
433 full_signature->as_C_string(),
434 basic_signature->as_C_string());
435 }
436 methodHandle result = SystemDictionary::find_method_handle_intrinsic(iid,
437 basic_signature,
438 CHECK_NULL);
439 if (result.not_null()) {
440 assert(result->is_method_handle_intrinsic(), "MH.invokeBasic or MH.linkTo* intrinsic");
441 assert(result->intrinsic_id() != vmIntrinsics::_invokeGeneric, "wrong place to find this");
442 assert(basic_signature == result->signature(), "predict the result signature");
443 if (TraceMethodHandles) {
444 ttyLocker ttyl;
445 tty->print("lookup_polymorphic_method => intrinsic ");
446 result->print_on(tty);
447 }
448 }
449 return result;
450 } else if (iid == vmIntrinsics::_invokeGeneric
451 && THREAD->can_call_java()
452 && appendix_result_or_null != NULL) {
453 // This is a method with type-checking semantics.
454 // We will ask Java code to spin an adapter method for it.
455 if (!MethodHandles::enabled()) {
456 // Make sure the Java part of the runtime has been booted up.
457 Klass* natives = SystemDictionary::MethodHandleNatives_klass();
458 if (natives == NULL || InstanceKlass::cast(natives)->is_not_initialized()) {
459 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_invoke_MethodHandleNatives(),
460 Handle(),
461 Handle(),
462 true,
463 CHECK_NULL);
464 }
465 }
466
467 Handle appendix;
468 Handle method_type;
469 methodHandle result = SystemDictionary::find_method_handle_invoker(
470 klass,
471 name,
472 full_signature,
473 link_info.current_klass(),
474 &appendix,
475 &method_type,
476 CHECK_NULL);
477 if (TraceMethodHandles) {
478 ttyLocker ttyl;
479 tty->print("lookup_polymorphic_method => (via Java) ");
480 result->print_on(tty);
481 tty->print(" lookup_polymorphic_method => appendix = ");
482 if (appendix.is_null()) tty->print_cr("(none)");
483 else appendix->print_on(tty);
484 }
485 if (result.not_null()) {
486 #ifdef ASSERT
487 ResourceMark rm(THREAD);
488
489 TempNewSymbol basic_signature =
490 MethodHandles::lookup_basic_type_signature(full_signature, CHECK_NULL);
491 int actual_size_of_params = result->size_of_parameters();
492 int expected_size_of_params = ArgumentSizeComputer(basic_signature).size();
493 // +1 for MethodHandle.this, +1 for trailing MethodType
494 if (!MethodHandles::is_signature_polymorphic_static(iid)) expected_size_of_params += 1;
495 if (appendix.not_null()) expected_size_of_params += 1;
496 if (actual_size_of_params != expected_size_of_params) {
497 tty->print_cr("*** basic_signature=%s", basic_signature->as_C_string());
498 tty->print_cr("*** result for %s: ", vmIntrinsics::name_at(iid));
499 result->print();
500 }
501 assert(actual_size_of_params == expected_size_of_params,
502 "%d != %d", actual_size_of_params, expected_size_of_params);
503 #endif //ASSERT
504
505 assert(appendix_result_or_null != NULL, "");
506 (*appendix_result_or_null) = appendix;
507 (*method_type_result) = method_type;
508 }
509 return result;
510 }
511 }
512 return NULL;
513 }
514
515 void LinkResolver::check_method_accessability(KlassHandle ref_klass,
516 KlassHandle resolved_klass,
517 KlassHandle sel_klass,
518 const methodHandle& sel_method,
519 TRAPS) {
520
521 AccessFlags flags = sel_method->access_flags();
522
523 // Special case: arrays always override "clone". JVMS 2.15.
524 // If the resolved klass is an array class, and the declaring class
525 // is java.lang.Object and the method is "clone", set the flags
526 // to public.
527 //
528 // We'll check for the method name first, as that's most likely
529 // to be false (so we'll short-circuit out of these tests).
530 if (sel_method->name() == vmSymbols::clone_name() &&
531 sel_klass() == SystemDictionary::Object_klass() &&
532 resolved_klass->is_array_klass()) {
533 // We need to change "protected" to "public".
534 assert(flags.is_protected(), "clone not protected?");
535 jint new_flags = flags.as_int();
536 new_flags = new_flags & (~JVM_ACC_PROTECTED);
537 new_flags = new_flags | JVM_ACC_PUBLIC;
538 flags.set_flags(new_flags);
539 }
540 // assert(extra_arg_result_or_null != NULL, "must be able to return extra argument");
541
542 if (!Reflection::verify_field_access(ref_klass(),
543 resolved_klass(),
544 sel_klass(),
545 flags,
546 true)) {
547 ResourceMark rm(THREAD);
548 Exceptions::fthrow(
549 THREAD_AND_LOCATION,
550 vmSymbols::java_lang_IllegalAccessError(),
551 "tried to access method %s.%s%s from class %s",
552 sel_klass->external_name(),
553 sel_method->name()->as_C_string(),
554 sel_method->signature()->as_C_string(),
555 ref_klass->external_name()
556 );
557 return;
558 }
559 }
560
561 methodHandle LinkResolver::resolve_method_statically(Bytecodes::Code code,
562 const constantPoolHandle& pool, int index, TRAPS) {
563 // This method is used only
564 // (1) in C2 from InlineTree::ok_to_inline (via ciMethod::check_call),
565 // and
566 // (2) in Bytecode_invoke::static_target
567 // It appears to fail when applied to an invokeinterface call site.
568 // FIXME: Remove this method and ciMethod::check_call; refactor to use the other LinkResolver entry points.
569 // resolve klass
570 KlassHandle resolved_klass;
571 if (code == Bytecodes::_invokedynamic) {
572 resolved_klass = SystemDictionary::MethodHandle_klass();
573 Symbol* method_name = vmSymbols::invoke_name();
574 Symbol* method_signature = pool->signature_ref_at(index);
575 KlassHandle current_klass(THREAD, pool->pool_holder());
576 LinkInfo link_info(resolved_klass, method_name, method_signature, current_klass);
577 return resolve_method(link_info, code, THREAD);
578 }
579
580 LinkInfo link_info(pool, index, CHECK_NULL);
581 resolved_klass = link_info.resolved_klass();
582
583 if (pool->has_preresolution()
584 || (resolved_klass() == SystemDictionary::MethodHandle_klass() &&
585 MethodHandles::is_signature_polymorphic_name(resolved_klass(), link_info.name()))) {
586 Method* result = ConstantPool::method_at_if_loaded(pool, index);
587 if (result != NULL) {
588 return methodHandle(THREAD, result);
589 }
590 }
591
592 if (code == Bytecodes::_invokeinterface) {
593 return resolve_interface_method(link_info, code, THREAD);
594 } else if (code == Bytecodes::_invokevirtual) {
595 return resolve_method(link_info, code, THREAD);
596 } else if (!resolved_klass->is_interface()) {
597 return resolve_method(link_info, code, THREAD);
598 } else {
599 return resolve_interface_method(link_info, code, THREAD);
600 }
601 }
602
603 // Check and print a loader constraint violation message for method or interface method
604 void LinkResolver::check_method_loader_constraints(const LinkInfo& link_info,
605 const methodHandle& resolved_method,
606 const char* method_type, TRAPS) {
607 Handle current_loader(THREAD, link_info.current_klass()->class_loader());
608 Handle resolved_loader(THREAD, resolved_method->method_holder()->class_loader());
609
610 ResourceMark rm(THREAD);
611 Symbol* failed_type_symbol =
612 SystemDictionary::check_signature_loaders(link_info.signature(), current_loader,
613 resolved_loader, true, CHECK);
614 if (failed_type_symbol != NULL) {
615 const char* msg = "loader constraint violation: when resolving %s"
616 " \"%s\" the class loader (instance of %s) of the current class, %s,"
617 " and the class loader (instance of %s) for the method's defining class, %s, have"
618 " different Class objects for the type %s used in the signature";
619 char* sig = link_info.method_string();
620 const char* loader1_name = SystemDictionary::loader_name(current_loader());
621 char* current = link_info.current_klass()->name()->as_C_string();
622 const char* loader2_name = SystemDictionary::loader_name(resolved_loader());
623 char* target = resolved_method->method_holder()->name()->as_C_string();
624 char* failed_type_name = failed_type_symbol->as_C_string();
625 size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1_name) +
626 strlen(current) + strlen(loader2_name) + strlen(target) +
627 strlen(failed_type_name) + strlen(method_type) + 1;
628 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen);
629 jio_snprintf(buf, buflen, msg, method_type, sig, loader1_name, current, loader2_name,
630 target, failed_type_name);
631 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf);
632 }
633 }
634
635 void LinkResolver::check_field_loader_constraints(Symbol* field, Symbol* sig,
636 KlassHandle current_klass,
637 KlassHandle sel_klass, TRAPS) {
638 Handle ref_loader(THREAD, current_klass->class_loader());
639 Handle sel_loader(THREAD, sel_klass->class_loader());
640
641 ResourceMark rm(THREAD); // needed for check_signature_loaders
642 Symbol* failed_type_symbol =
643 SystemDictionary::check_signature_loaders(sig,
644 ref_loader, sel_loader,
645 false,
646 CHECK);
647 if (failed_type_symbol != NULL) {
648 const char* msg = "loader constraint violation: when resolving field"
649 " \"%s\" the class loader (instance of %s) of the referring class, "
650 "%s, and the class loader (instance of %s) for the field's resolved "
651 "type, %s, have different Class objects for that type";
652 char* field_name = field->as_C_string();
653 const char* loader1_name = SystemDictionary::loader_name(ref_loader());
654 char* sel = sel_klass->name()->as_C_string();
655 const char* loader2_name = SystemDictionary::loader_name(sel_loader());
656 char* failed_type_name = failed_type_symbol->as_C_string();
657 size_t buflen = strlen(msg) + strlen(field_name) + strlen(loader1_name) +
658 strlen(sel) + strlen(loader2_name) + strlen(failed_type_name) + 1;
659 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen);
660 jio_snprintf(buf, buflen, msg, field_name, loader1_name, sel, loader2_name,
661 failed_type_name);
662 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf);
663 }
664 }
665
666 methodHandle LinkResolver::resolve_method(const LinkInfo& link_info,
667 Bytecodes::Code code, TRAPS) {
668
669 Handle nested_exception;
670 KlassHandle resolved_klass = link_info.resolved_klass();
671
672 // 1. For invokevirtual, cannot call an interface method
673 if (code == Bytecodes::_invokevirtual && resolved_klass->is_interface()) {
674 ResourceMark rm(THREAD);
675 char buf[200];
676 jio_snprintf(buf, sizeof(buf), "Found interface %s, but class was expected",
677 resolved_klass()->external_name());
678 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
679 }
680
681 // 2. check constant pool tag for called method - must be JVM_CONSTANT_Methodref
682 if (!link_info.tag().is_invalid() && !link_info.tag().is_method()) {
683 ResourceMark rm(THREAD);
684 char buf[200];
685 jio_snprintf(buf, sizeof(buf), "Method %s must be Methodref constant", link_info.method_string());
686 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
687 }
688
689
690 // 3. lookup method in resolved klass and its super klasses
691 methodHandle resolved_method = lookup_method_in_klasses(link_info, true, false, CHECK_NULL);
692
693 // 4. lookup method in all the interfaces implemented by the resolved klass
694 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) { // not found in the class hierarchy
695 resolved_method = lookup_method_in_interfaces(link_info, CHECK_NULL);
696
697 if (resolved_method.is_null()) {
698 // JSR 292: see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc
699 resolved_method = lookup_polymorphic_method(link_info, (Handle*)NULL, (Handle*)NULL, THREAD);
700 if (HAS_PENDING_EXCEPTION) {
701 nested_exception = Handle(THREAD, PENDING_EXCEPTION);
702 CLEAR_PENDING_EXCEPTION;
703 }
704 }
705 }
706
707 // 5. method lookup failed
708 if (resolved_method.is_null()) {
709 ResourceMark rm(THREAD);
710 THROW_MSG_CAUSE_(vmSymbols::java_lang_NoSuchMethodError(),
711 Method::name_and_sig_as_C_string(resolved_klass(),
712 link_info.name(),
713 link_info.signature()),
714 nested_exception, NULL);
715 }
716
717 // 6. access checks, access checking may be turned off when calling from within the VM.
718 KlassHandle current_klass = link_info.current_klass();
719 if (link_info.check_access()) {
720 assert(current_klass.not_null() , "current_klass should not be null");
721
722 // check if method can be accessed by the referring class
723 check_method_accessability(current_klass,
724 resolved_klass,
725 KlassHandle(THREAD, resolved_method->method_holder()),
726 resolved_method,
727 CHECK_NULL);
728
729 // check loader constraints
730 check_method_loader_constraints(link_info, resolved_method, "method", CHECK_NULL);
731 }
732
733 return resolved_method;
734 }
735
736 static void trace_method_resolution(const char* prefix,
737 KlassHandle klass,
738 KlassHandle resolved_klass,
739 const methodHandle& method,
740 bool logitables,
741 int index = -1) {
742 #ifndef PRODUCT
743 ResourceMark rm;
744 outputStream* st;
745 if (logitables) {
746 st = Log(itables)::trace_stream();
747 } else {
748 st = Log(vtables)::trace_stream();
749 }
750 st->print("%s%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ",
751 prefix,
752 (klass.is_null() ? "<NULL>" : klass->internal_name()),
753 (resolved_klass.is_null() ? "<NULL>" : resolved_klass->internal_name()),
754 Method::name_and_sig_as_C_string(resolved_klass(),
755 method->name(),
756 method->signature()),
757 method->method_holder()->internal_name());
758 method->print_linkage_flags(st);
759 if (index != -1) {
760 st->print("vtable_index:%d", index);
761 }
762 st->cr();
763 #endif // PRODUCT
764 }
765
766 // Do linktime resolution of a method in the interface within the context of the specied bytecode.
767 methodHandle LinkResolver::resolve_interface_method(const LinkInfo& link_info, Bytecodes::Code code, TRAPS) {
768
769 KlassHandle resolved_klass = link_info.resolved_klass();
770
771 // check if klass is interface
772 if (!resolved_klass->is_interface()) {
773 ResourceMark rm(THREAD);
774 char buf[200];
775 jio_snprintf(buf, sizeof(buf), "Found class %s, but interface was expected", resolved_klass()->external_name());
776 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
777 }
778
779 // check constant pool tag for called method - must be JVM_CONSTANT_InterfaceMethodref
780 if (!link_info.tag().is_invalid() && !link_info.tag().is_interface_method()) {
781 ResourceMark rm(THREAD);
782 char buf[200];
783 jio_snprintf(buf, sizeof(buf), "Method %s must be InterfaceMethodref constant", link_info.method_string());
784 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
785 }
786
787 // lookup method in this interface or its super, java.lang.Object
788 // JDK8: also look for static methods
789 methodHandle resolved_method = lookup_method_in_klasses(link_info, false, true, CHECK_NULL);
790
791 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) {
792 // lookup method in all the super-interfaces
793 resolved_method = lookup_method_in_interfaces(link_info, CHECK_NULL);
794 }
795
796 if (resolved_method.is_null()) {
797 // no method found
798 ResourceMark rm(THREAD);
799 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(),
800 Method::name_and_sig_as_C_string(resolved_klass(),
801 link_info.name(),
802 link_info.signature()));
803 }
804
805 if (link_info.check_access()) {
806 // JDK8 adds non-public interface methods, and accessability check requirement
807 KlassHandle current_klass = link_info.current_klass();
808
809 assert(current_klass.not_null() , "current_klass should not be null");
810
811 // check if method can be accessed by the referring class
812 check_method_accessability(current_klass,
813 resolved_klass,
814 KlassHandle(THREAD, resolved_method->method_holder()),
815 resolved_method,
816 CHECK_NULL);
817
818 check_method_loader_constraints(link_info, resolved_method, "interface method", CHECK_NULL);
819 }
820
821 if (code != Bytecodes::_invokestatic && resolved_method->is_static()) {
822 ResourceMark rm(THREAD);
823 char buf[200];
824 jio_snprintf(buf, sizeof(buf), "Expected instance not static method %s",
825 Method::name_and_sig_as_C_string(resolved_klass(),
826 resolved_method->name(), resolved_method->signature()));
827 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
828 }
829
830 if (code == Bytecodes::_invokeinterface && resolved_method->is_private()) {
831 ResourceMark rm(THREAD);
832 char buf[200];
833
834 KlassHandle current_klass = link_info.current_klass();
835 jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokeinterface: method %s, caller-class:%s",
836 Method::name_and_sig_as_C_string(resolved_klass(),
837 resolved_method->name(),
838 resolved_method->signature()),
839 (current_klass.is_null() ? "<NULL>" : current_klass->internal_name()));
840 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
841 }
842
843 if (log_develop_is_enabled(Trace, itables)) {
844 trace_method_resolution("invokeinterface resolved method: caller-class",
845 link_info.current_klass(), resolved_klass,
846 resolved_method, true);
847 }
848
849 return resolved_method;
850 }
851
852 //------------------------------------------------------------------------------------------------------------------------
853 // Field resolution
854
855 void LinkResolver::check_field_accessability(KlassHandle ref_klass,
856 KlassHandle resolved_klass,
857 KlassHandle sel_klass,
858 const fieldDescriptor& fd,
859 TRAPS) {
860 if (!Reflection::verify_field_access(ref_klass(),
861 resolved_klass(),
862 sel_klass(),
863 fd.access_flags(),
864 true)) {
865 ResourceMark rm(THREAD);
866 Exceptions::fthrow(
867 THREAD_AND_LOCATION,
868 vmSymbols::java_lang_IllegalAccessError(),
869 "tried to access field %s.%s from class %s",
870 sel_klass->external_name(),
871 fd.name()->as_C_string(),
872 ref_klass->external_name()
873 );
874 return;
875 }
876 }
877
878 void LinkResolver::resolve_field_access(fieldDescriptor& fd, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) {
879 LinkInfo link_info(pool, index, CHECK);
880 resolve_field(fd, link_info, byte, true, CHECK);
881 }
882
883 void LinkResolver::resolve_field(fieldDescriptor& fd,
884 const LinkInfo& link_info,
885 Bytecodes::Code byte, bool initialize_class,
886 TRAPS) {
887 assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic ||
888 byte == Bytecodes::_getfield || byte == Bytecodes::_putfield ||
889 byte == Bytecodes::_nofast_getfield || byte == Bytecodes::_nofast_putfield ||
890 (byte == Bytecodes::_nop && !link_info.check_access()), "bad field access bytecode");
891
892 bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic);
893 bool is_put = (byte == Bytecodes::_putfield || byte == Bytecodes::_putstatic || byte == Bytecodes::_nofast_putfield);
894 // Check if there's a resolved klass containing the field
895 KlassHandle resolved_klass = link_info.resolved_klass();
896 Symbol* field = link_info.name();
897 Symbol* sig = link_info.signature();
898
899 if (resolved_klass.is_null()) {
900 ResourceMark rm(THREAD);
901 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
902 }
903
904 // Resolve instance field
905 KlassHandle sel_klass(THREAD, resolved_klass->find_field(field, sig, &fd));
906 // check if field exists; i.e., if a klass containing the field def has been selected
907 if (sel_klass.is_null()) {
908 ResourceMark rm(THREAD);
909 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
910 }
911
912 if (!link_info.check_access())
913 // Access checking may be turned off when calling from within the VM.
914 return;
915
916 // check access
917 KlassHandle current_klass = link_info.current_klass();
918 check_field_accessability(current_klass, resolved_klass, sel_klass, fd, CHECK);
919
920 // check for errors
921 if (is_static != fd.is_static()) {
922 ResourceMark rm(THREAD);
923 char msg[200];
924 jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", resolved_klass()->external_name(), fd.name()->as_C_string());
925 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg);
926 }
927
928 // Final fields can only be accessed from its own class.
929 if (is_put && fd.access_flags().is_final() && sel_klass() != current_klass()) {
930 THROW(vmSymbols::java_lang_IllegalAccessError());
931 }
932
933 // initialize resolved_klass if necessary
934 // note 1: the klass which declared the field must be initialized (i.e, sel_klass)
935 // according to the newest JVM spec (5.5, p.170) - was bug (gri 7/28/99)
936 //
937 // note 2: we don't want to force initialization if we are just checking
938 // if the field access is legal; e.g., during compilation
939 if (is_static && initialize_class) {
940 sel_klass->initialize(CHECK);
941 }
942
943 if (sel_klass() != current_klass()) {
944 check_field_loader_constraints(field, sig, current_klass, sel_klass, CHECK);
945 }
946
947 // return information. note that the klass is set to the actual klass containing the
948 // field, otherwise access of static fields in superclasses will not work.
949 }
950
951
952 //------------------------------------------------------------------------------------------------------------------------
953 // Invoke resolution
954 //
955 // Naming conventions:
956 //
957 // resolved_method the specified method (i.e., static receiver specified via constant pool index)
958 // sel_method the selected method (selected via run-time lookup; e.g., based on dynamic receiver class)
959 // resolved_klass the specified klass (i.e., specified via constant pool index)
960 // recv_klass the receiver klass
961
962
963 void LinkResolver::resolve_static_call(CallInfo& result,
964 const LinkInfo& link_info,
965 bool initialize_class, TRAPS) {
966 methodHandle resolved_method = linktime_resolve_static_method(link_info, CHECK);
967
968 // The resolved class can change as a result of this resolution.
969 KlassHandle resolved_klass(THREAD, resolved_method->method_holder());
970
971 // Initialize klass (this should only happen if everything is ok)
972 if (initialize_class && resolved_klass->should_be_initialized()) {
973 resolved_klass->initialize(CHECK);
974 // Use updated LinkInfo to reresolve with resolved method holder
975 LinkInfo new_info(resolved_klass, link_info.name(), link_info.signature(),
976 link_info.current_klass(),
977 link_info.check_access() ? LinkInfo::needs_access_check : LinkInfo::skip_access_check);
978 resolved_method = linktime_resolve_static_method(new_info, CHECK);
979 }
980
981 // setup result
982 result.set_static(resolved_klass, resolved_method, CHECK);
983 }
984
985 // throws linktime exceptions
986 methodHandle LinkResolver::linktime_resolve_static_method(const LinkInfo& link_info, TRAPS) {
987
988 KlassHandle resolved_klass = link_info.resolved_klass();
989 methodHandle resolved_method;
990 if (!resolved_klass->is_interface()) {
991 resolved_method = resolve_method(link_info, Bytecodes::_invokestatic, CHECK_NULL);
992 } else {
993 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokestatic, CHECK_NULL);
994 }
995 assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier");
996
997 // check if static
998 if (!resolved_method->is_static()) {
999 ResourceMark rm(THREAD);
1000 char buf[200];
1001 jio_snprintf(buf, sizeof(buf), "Expected static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
1002 resolved_method->name(),
1003 resolved_method->signature()));
1004 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1005 }
1006 return resolved_method;
1007 }
1008
1009
1010 void LinkResolver::resolve_special_call(CallInfo& result,
1011 const LinkInfo& link_info,
1012 TRAPS) {
1013 methodHandle resolved_method = linktime_resolve_special_method(link_info, CHECK);
1014 runtime_resolve_special_method(result, resolved_method,
1015 link_info.resolved_klass(),
1016 link_info.current_klass(),
1017 link_info.check_access(), CHECK);
1018 }
1019
1020 // throws linktime exceptions
1021 methodHandle LinkResolver::linktime_resolve_special_method(const LinkInfo& link_info,
1022 TRAPS) {
1023
1024 // Invokespecial is called for multiple special reasons:
1025 // <init>
1026 // local private method invocation, for classes and interfaces
1027 // superclass.method, which can also resolve to a default method
1028 // and the selected method is recalculated relative to the direct superclass
1029 // superinterface.method, which explicitly does not check shadowing
1030 KlassHandle resolved_klass = link_info.resolved_klass();
1031 methodHandle resolved_method;
1032
1033 if (!resolved_klass->is_interface()) {
1034 resolved_method = resolve_method(link_info, Bytecodes::_invokespecial, CHECK_NULL);
1035 } else {
1036 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokespecial, CHECK_NULL);
1037 }
1038
1039 // check if method name is <init>, that it is found in same klass as static type
1040 if (resolved_method->name() == vmSymbols::object_initializer_name() &&
1041 resolved_method->method_holder() != resolved_klass()) {
1042 ResourceMark rm(THREAD);
1043 Exceptions::fthrow(
1044 THREAD_AND_LOCATION,
1045 vmSymbols::java_lang_NoSuchMethodError(),
1046 "%s: method %s%s not found",
1047 resolved_klass->external_name(),
1048 resolved_method->name()->as_C_string(),
1049 resolved_method->signature()->as_C_string()
1050 );
1051 return NULL;
1052 }
1053
1054 // check if invokespecial's interface method reference is in an indirect superinterface
1055 KlassHandle current_klass = link_info.current_klass();
1056 if (!current_klass.is_null() && resolved_klass->is_interface()) {
1057 Klass *klass_to_check = !InstanceKlass::cast(current_klass())->is_anonymous() ?
1058 current_klass() :
1059 InstanceKlass::cast(current_klass())->host_klass();
1060 // Disable verification for the dynamically-generated reflection bytecodes.
1061 bool is_reflect = klass_to_check->is_subclass_of(
1062 SystemDictionary::reflect_MagicAccessorImpl_klass());
1063
1064 if (!is_reflect &&
1065 !InstanceKlass::cast(klass_to_check)->is_same_or_direct_interface(resolved_klass())) {
1066 ResourceMark rm(THREAD);
1067 char buf[200];
1068 jio_snprintf(buf, sizeof(buf),
1069 "Interface method reference: %s, is in an indirect superinterface of %s",
1070 Method::name_and_sig_as_C_string(resolved_klass(),
1071 resolved_method->name(),
1072 resolved_method->signature()),
1073 current_klass->external_name());
1074 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1075 }
1076 }
1077
1078 // check if not static
1079 if (resolved_method->is_static()) {
1080 ResourceMark rm(THREAD);
1081 char buf[200];
1082 jio_snprintf(buf, sizeof(buf),
1083 "Expecting non-static method %s",
1084 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
1090 if (log_develop_is_enabled(Trace, itables)) {
1091 trace_method_resolution("invokespecial resolved method: caller-class:",
1092 current_klass, resolved_klass, resolved_method, true);
1093 }
1094
1095 return resolved_method;
1096 }
1097
1098 // throws runtime exceptions
1099 void LinkResolver::runtime_resolve_special_method(CallInfo& result,
1100 const methodHandle& resolved_method,
1101 KlassHandle resolved_klass,
1102 KlassHandle current_klass,
1103 bool check_access, TRAPS) {
1104
1105 // resolved method is selected method unless we have an old-style lookup
1106 // for a superclass method
1107 // Invokespecial for a superinterface, resolved method is selected method,
1108 // no checks for shadowing
1109 methodHandle sel_method(THREAD, resolved_method());
1110
1111 // check if this is an old-style super call and do a new lookup if so
1112 { KlassHandle method_klass = KlassHandle(THREAD,
1113 resolved_method->method_holder());
1114
1115 if (check_access &&
1116 // a) check if ACC_SUPER flag is set for the current class
1117 (current_klass->is_super() || !AllowNonVirtualCalls) &&
1118 // b) check if the class of the resolved_klass is a superclass
1119 // (not supertype in order to exclude interface classes) of the current class.
1120 // This check is not performed for super.invoke for interface methods
1121 // in super interfaces.
1122 current_klass->is_subclass_of(resolved_klass()) &&
1123 current_klass() != resolved_klass() &&
1124 // c) check if the method is not <init>
1125 resolved_method->name() != vmSymbols::object_initializer_name()) {
1126 // Lookup super method
1127 KlassHandle super_klass(THREAD, current_klass->super());
1128 sel_method = lookup_instance_method_in_klasses(super_klass,
1129 resolved_method->name(),
1130 resolved_method->signature(), CHECK);
1131 // check if found
1132 if (sel_method.is_null()) {
1133 ResourceMark rm(THREAD);
1134 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1135 Method::name_and_sig_as_C_string(resolved_klass(),
1136 resolved_method->name(),
1137 resolved_method->signature()));
1138 }
1139 }
1140 }
1141
1142 // check if not static
1143 if (sel_method->is_static()) {
1144 ResourceMark rm(THREAD);
1145 char buf[200];
1146 jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
1147 resolved_method->name(),
1148 resolved_method->signature()));
1149 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1150 }
1151
1152 // check if abstract
1153 if (sel_method->is_abstract()) {
1154 ResourceMark rm(THREAD);
1155 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1156 Method::name_and_sig_as_C_string(resolved_klass(),
1157 sel_method->name(),
1158 sel_method->signature()));
1159 }
1160
1161 if (log_develop_is_enabled(Trace, itables)) {
1162 trace_method_resolution("invokespecial selected method: resolved-class:",
1163 resolved_klass, resolved_klass, sel_method, true);
1164 }
1165
1166 // setup result
1167 result.set_static(resolved_klass, sel_method, CHECK);
1168 }
1169
1170 void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, KlassHandle receiver_klass,
1171 const LinkInfo& link_info,
1172 bool check_null_and_abstract, TRAPS) {
1173 methodHandle resolved_method = linktime_resolve_virtual_method(link_info, CHECK);
1174 runtime_resolve_virtual_method(result, resolved_method,
1175 link_info.resolved_klass(),
1176 recv, receiver_klass,
1177 check_null_and_abstract, CHECK);
1178 }
1179
1180 // throws linktime exceptions
1181 methodHandle LinkResolver::linktime_resolve_virtual_method(const LinkInfo& link_info,
1182 TRAPS) {
1183 // normal method resolution
1184 methodHandle resolved_method = resolve_method(link_info, Bytecodes::_invokevirtual, CHECK_NULL);
1185
1186 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1187 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1188
1189 // check if private interface method
1190 KlassHandle resolved_klass = link_info.resolved_klass();
1191 KlassHandle current_klass = link_info.current_klass();
1192
1193 // This is impossible, if resolve_klass is an interface, we've thrown icce in resolve_method
1194 if (resolved_klass->is_interface() && resolved_method->is_private()) {
1195 ResourceMark rm(THREAD);
1196 char buf[200];
1197 jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokevirtual: method %s, caller-class:%s",
1198 Method::name_and_sig_as_C_string(resolved_klass(),
1199 resolved_method->name(),
1200 resolved_method->signature()),
1201 (current_klass.is_null() ? "<NULL>" : current_klass->internal_name()));
1202 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1203 }
1204
1205 // check if not static
1206 if (resolved_method->is_static()) {
1207 ResourceMark rm(THREAD);
1208 char buf[200];
1209 jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
1210 resolved_method->name(),
1211 resolved_method->signature()));
1212 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1213 }
1214
1215 if (log_develop_is_enabled(Trace, vtables)) {
1216 trace_method_resolution("invokevirtual resolved method: caller-class:",
1217 current_klass, resolved_klass, resolved_method, false);
1218 }
1219
1220 return resolved_method;
1221 }
1222
1223 // throws runtime exceptions
1224 void LinkResolver::runtime_resolve_virtual_method(CallInfo& result,
1225 const methodHandle& resolved_method,
1226 KlassHandle resolved_klass,
1227 Handle recv,
1228 KlassHandle recv_klass,
1229 bool check_null_and_abstract,
1230 TRAPS) {
1231
1232 // setup default return values
1233 int vtable_index = Method::invalid_vtable_index;
1234 methodHandle selected_method;
1235
1236 assert(recv.is_null() || recv->is_oop(), "receiver is not an oop");
1237
1238 // runtime method resolution
1239 if (check_null_and_abstract && recv.is_null()) { // check if receiver exists
1240 THROW(vmSymbols::java_lang_NullPointerException());
1241 }
1242
1243 // Virtual methods cannot be resolved before its klass has been linked, for otherwise the Method*'s
1244 // has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since
1245 // a missing receiver might result in a bogus lookup.
1246 assert(resolved_method->method_holder()->is_linked(), "must be linked");
1247
1248 // do lookup based on receiver klass using the vtable index
1249 if (resolved_method->method_holder()->is_interface()) { // default or miranda method
1250 vtable_index = vtable_index_of_interface_method(resolved_klass,
1251 resolved_method);
1252 assert(vtable_index >= 0 , "we should have valid vtable index at this point");
1253
1254 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1255 } else {
1256 // at this point we are sure that resolved_method is virtual and not
1257 // a default or miranda method; therefore, it must have a valid vtable index.
1258 assert(!resolved_method->has_itable_index(), "");
1259 vtable_index = resolved_method->vtable_index();
1260 // We could get a negative vtable_index for final methods,
1261 // because as an optimization they are they are never put in the vtable,
1262 // unless they override an existing method.
1263 // If we do get a negative, it means the resolved method is the the selected
1264 // method, and it can never be changed by an override.
1265 if (vtable_index == Method::nonvirtual_vtable_index) {
1266 assert(resolved_method->can_be_statically_bound(), "cannot override this method");
1267 selected_method = resolved_method;
1268 } else {
1269 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1270 }
1271 }
1272
1273 // check if method exists
1274 if (selected_method.is_null()) {
1275 ResourceMark rm(THREAD);
1276 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1277 Method::name_and_sig_as_C_string(resolved_klass(),
1278 resolved_method->name(),
1279 resolved_method->signature()));
1280 }
1281
1282 // check if abstract
1283 if (check_null_and_abstract && selected_method->is_abstract()) {
1284 ResourceMark rm(THREAD);
1285 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1286 Method::name_and_sig_as_C_string(resolved_klass(),
1287 selected_method->name(),
1288 selected_method->signature()));
1289 }
1290
1291 if (log_develop_is_enabled(Trace, vtables)) {
1292 trace_method_resolution("invokevirtual selected method: receiver-class:",
1293 recv_klass, resolved_klass, selected_method,
1294 false, vtable_index);
1295 }
1296 // setup result
1297 result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK);
1298 }
1299
1300 void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, KlassHandle recv_klass,
1301 const LinkInfo& link_info,
1302 bool check_null_and_abstract, TRAPS) {
1303 // throws linktime exceptions
1304 methodHandle resolved_method = linktime_resolve_interface_method(link_info, CHECK);
1305 runtime_resolve_interface_method(result, resolved_method,link_info.resolved_klass(),
1306 recv, recv_klass, check_null_and_abstract, CHECK);
1307 }
1308
1309 methodHandle LinkResolver::linktime_resolve_interface_method(const LinkInfo& link_info,
1310 TRAPS) {
1311 // normal interface method resolution
1312 methodHandle resolved_method = resolve_interface_method(link_info, Bytecodes::_invokeinterface, CHECK_NULL);
1313 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1314 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1315
1316 return resolved_method;
1317 }
1318
1319 // throws runtime exceptions
1320 void LinkResolver::runtime_resolve_interface_method(CallInfo& result,
1321 const methodHandle& resolved_method,
1322 KlassHandle resolved_klass,
1323 Handle recv,
1324 KlassHandle recv_klass,
1325 bool check_null_and_abstract, TRAPS) {
1326 // check if receiver exists
1327 if (check_null_and_abstract && recv.is_null()) {
1328 THROW(vmSymbols::java_lang_NullPointerException());
1329 }
1330
1331 // check if receiver klass implements the resolved interface
1332 if (!recv_klass->is_subtype_of(resolved_klass())) {
1333 ResourceMark rm(THREAD);
1334 char buf[200];
1335 jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s",
1336 recv_klass()->external_name(),
1337 resolved_klass()->external_name());
1338 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1339 }
1340
1341 // do lookup based on receiver klass
1342 // This search must match the linktime preparation search for itable initialization
1343 // to correctly enforce loader constraints for interface method inheritance
1344 methodHandle sel_method = lookup_instance_method_in_klasses(recv_klass,
1345 resolved_method->name(),
1346 resolved_method->signature(), CHECK);
1347 if (sel_method.is_null() && !check_null_and_abstract) {
1348 // In theory this is a harmless placeholder value, but
1349 // in practice leaving in null affects the nsk default method tests.
1350 // This needs further study.
1351 sel_method = resolved_method;
1352 }
1353 // check if method exists
1354 if (sel_method.is_null()) {
1355 ResourceMark rm(THREAD);
1356 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1357 Method::name_and_sig_as_C_string(recv_klass(),
1358 resolved_method->name(),
1359 resolved_method->signature()));
1360 }
1361 // check access
1362 // Throw Illegal Access Error if sel_method is not public.
1363 if (!sel_method->is_public()) {
1364 ResourceMark rm(THREAD);
1365 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(),
1366 Method::name_and_sig_as_C_string(recv_klass(),
1367 sel_method->name(),
1368 sel_method->signature()));
1369 }
1370 // check if abstract
1371 if (check_null_and_abstract && sel_method->is_abstract()) {
1372 ResourceMark rm(THREAD);
1373 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1374 Method::name_and_sig_as_C_string(recv_klass(),
1375 sel_method->name(),
1376 sel_method->signature()));
1377 }
1378
1379 if (log_develop_is_enabled(Trace, itables)) {
1380 trace_method_resolution("invokeinterface selected method: receiver-class",
1381 recv_klass, resolved_klass, sel_method, true);
1382 }
1383 // setup result
1384 if (!resolved_method->has_itable_index()) {
1385 int vtable_index = resolved_method->vtable_index();
1386 assert(vtable_index == sel_method->vtable_index(), "sanity check");
1387 result.set_virtual(resolved_klass, recv_klass, resolved_method, sel_method, vtable_index, CHECK);
1388 } else {
1389 int itable_index = resolved_method()->itable_index();
1390 result.set_interface(resolved_klass, recv_klass, resolved_method, sel_method, itable_index, CHECK);
1391 }
1392 }
1393
1394
1395 methodHandle LinkResolver::linktime_resolve_interface_method_or_null(
1396 const LinkInfo& link_info) {
1397 EXCEPTION_MARK;
1398 methodHandle method_result = linktime_resolve_interface_method(link_info, THREAD);
1399 if (HAS_PENDING_EXCEPTION) {
1400 CLEAR_PENDING_EXCEPTION;
1401 return methodHandle();
1402 } else {
1403 return method_result;
1404 }
1405 }
1406
1407 methodHandle LinkResolver::linktime_resolve_virtual_method_or_null(
1408 const LinkInfo& link_info) {
1409 EXCEPTION_MARK;
1410 methodHandle method_result = linktime_resolve_virtual_method(link_info, THREAD);
1411 if (HAS_PENDING_EXCEPTION) {
1412 CLEAR_PENDING_EXCEPTION;
1413 return methodHandle();
1414 } else {
1415 return method_result;
1416 }
1417 }
1418
1419 methodHandle LinkResolver::resolve_virtual_call_or_null(
1420 KlassHandle receiver_klass,
1421 const LinkInfo& link_info) {
1422 EXCEPTION_MARK;
1423 CallInfo info;
1424 resolve_virtual_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1425 if (HAS_PENDING_EXCEPTION) {
1426 CLEAR_PENDING_EXCEPTION;
1427 return methodHandle();
1428 }
1429 return info.selected_method();
1430 }
1431
1432 methodHandle LinkResolver::resolve_interface_call_or_null(
1433 KlassHandle receiver_klass,
1434 const LinkInfo& link_info) {
1435 EXCEPTION_MARK;
1436 CallInfo info;
1437 resolve_interface_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1438 if (HAS_PENDING_EXCEPTION) {
1439 CLEAR_PENDING_EXCEPTION;
1440 return methodHandle();
1441 }
1442 return info.selected_method();
1443 }
1444
1445 int LinkResolver::resolve_virtual_vtable_index(KlassHandle receiver_klass,
1446 const LinkInfo& link_info) {
1447 EXCEPTION_MARK;
1448 CallInfo info;
1449 resolve_virtual_call(info, Handle(), receiver_klass, link_info,
1450 /*check_null_or_abstract*/false, THREAD);
1451 if (HAS_PENDING_EXCEPTION) {
1452 CLEAR_PENDING_EXCEPTION;
1453 return Method::invalid_vtable_index;
1454 }
1455 return info.vtable_index();
1456 }
1457
1458 methodHandle LinkResolver::resolve_static_call_or_null(const LinkInfo& link_info) {
1459 EXCEPTION_MARK;
1460 CallInfo info;
1461 resolve_static_call(info, link_info, /*initialize_class*/false, THREAD);
1462 if (HAS_PENDING_EXCEPTION) {
1463 CLEAR_PENDING_EXCEPTION;
1464 return methodHandle();
1465 }
1466 return info.selected_method();
1467 }
1468
1469 methodHandle LinkResolver::resolve_special_call_or_null(const LinkInfo& link_info) {
1470 EXCEPTION_MARK;
1471 CallInfo info;
1472 resolve_special_call(info, link_info, THREAD);
1473 if (HAS_PENDING_EXCEPTION) {
1474 CLEAR_PENDING_EXCEPTION;
1475 return methodHandle();
1476 }
1477 return info.selected_method();
1478 }
1479
1480
1481
1482 //------------------------------------------------------------------------------------------------------------------------
1483 // ConstantPool entries
1484
1485 void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) {
1486 switch (byte) {
1487 case Bytecodes::_invokestatic : resolve_invokestatic (result, pool, index, CHECK); break;
1488 case Bytecodes::_invokespecial : resolve_invokespecial (result, pool, index, CHECK); break;
1489 case Bytecodes::_invokevirtual : resolve_invokevirtual (result, recv, pool, index, CHECK); break;
1490 case Bytecodes::_invokehandle : resolve_invokehandle (result, pool, index, CHECK); break;
1491 case Bytecodes::_invokedynamic : resolve_invokedynamic (result, pool, index, CHECK); break;
1492 case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break;
1493 }
1494 return;
1495 }
1496
1497 void LinkResolver::resolve_invoke(CallInfo& result, Handle& recv,
1498 const methodHandle& attached_method,
1499 Bytecodes::Code byte, TRAPS) {
1500 KlassHandle defc = attached_method->method_holder();
1501 Symbol* name = attached_method->name();
1502 Symbol* type = attached_method->signature();
1503 LinkInfo link_info(defc, name, type);
1504 switch(byte) {
1505 case Bytecodes::_invokevirtual:
1506 resolve_virtual_call(result, recv, recv->klass(), link_info,
1507 /*check_null_and_abstract=*/true, CHECK);
1508 break;
1509 case Bytecodes::_invokeinterface:
1510 resolve_interface_call(result, recv, recv->klass(), link_info,
1511 /*check_null_and_abstract=*/true, CHECK);
1512 break;
1513 case Bytecodes::_invokestatic:
1514 resolve_static_call(result, link_info, /*initialize_class=*/false, CHECK);
1515 break;
1516 case Bytecodes::_invokespecial:
1517 resolve_special_call(result, link_info, CHECK);
1518 break;
1519 default:
1520 fatal("bad call: %s", Bytecodes::name(byte));
1521 }
1522 }
1523
1524 void LinkResolver::resolve_invokestatic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1525 LinkInfo link_info(pool, index, CHECK);
1526 resolve_static_call(result, link_info, /*initialize_class*/true, CHECK);
1527 }
1528
1529
1530 void LinkResolver::resolve_invokespecial(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1531 LinkInfo link_info(pool, index, CHECK);
1532 resolve_special_call(result, link_info, CHECK);
1533 }
1534
1535
1536 void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv,
1537 const constantPoolHandle& pool, int index,
1538 TRAPS) {
1539
1540 LinkInfo link_info(pool, index, CHECK);
1541 KlassHandle recvrKlass (THREAD, recv.is_null() ? (Klass*)NULL : recv->klass());
1542 resolve_virtual_call(result, recv, recvrKlass, link_info, /*check_null_or_abstract*/true, CHECK);
1543 }
1544
1545
1546 void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, TRAPS) {
1547 LinkInfo link_info(pool, index, CHECK);
1548 KlassHandle recvrKlass (THREAD, recv.is_null() ? (Klass*)NULL : recv->klass());
1549 resolve_interface_call(result, recv, recvrKlass, link_info, true, CHECK);
1550 }
1551
1552
1553 void LinkResolver::resolve_invokehandle(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1554 // This guy is reached from InterpreterRuntime::resolve_invokehandle.
1555 LinkInfo link_info(pool, index, CHECK);
1556 if (TraceMethodHandles) {
1557 ResourceMark rm(THREAD);
1558 tty->print_cr("resolve_invokehandle %s %s", link_info.name()->as_C_string(),
1559 link_info.signature()->as_C_string());
1560 }
1561 resolve_handle_call(result, link_info, CHECK);
1562 }
1563
1564 void LinkResolver::resolve_handle_call(CallInfo& result,
1565 const LinkInfo& link_info,
1566 TRAPS) {
1567 // JSR 292: this must be an implicitly generated method MethodHandle.invokeExact(*...) or similar
1568 KlassHandle resolved_klass = link_info.resolved_klass();
1569 assert(resolved_klass() == SystemDictionary::MethodHandle_klass() ||
1570 resolved_klass() == SystemDictionary::VarHandle_klass(), "");
1571 assert(MethodHandles::is_signature_polymorphic_name(link_info.name()), "");
1572 Handle resolved_appendix;
1573 Handle resolved_method_type;
1574 methodHandle resolved_method = lookup_polymorphic_method(link_info,
1575 &resolved_appendix, &resolved_method_type, CHECK);
1576 result.set_handle(resolved_klass, resolved_method, resolved_appendix, resolved_method_type, CHECK);
1577 }
1578
1579 static void wrap_invokedynamic_exception(TRAPS) {
1580 if (HAS_PENDING_EXCEPTION) {
1581 if (TraceMethodHandles) {
1582 tty->print_cr("invokedynamic throws BSME for " INTPTR_FORMAT, p2i((void *)PENDING_EXCEPTION));
1583 PENDING_EXCEPTION->print();
1584 }
1585 if (PENDING_EXCEPTION->is_a(SystemDictionary::BootstrapMethodError_klass())) {
1586 // throw these guys, since they are already wrapped
1587 return;
1588 }
1589 if (!PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1590 // intercept only LinkageErrors which might have failed to wrap
1591 return;
1592 }
1593 // See the "Linking Exceptions" section for the invokedynamic instruction in the JVMS.
1594 Handle nested_exception(THREAD, PENDING_EXCEPTION);
1595 CLEAR_PENDING_EXCEPTION;
1596 THROW_CAUSE(vmSymbols::java_lang_BootstrapMethodError(), nested_exception)
1597 }
1598 }
1599
1600 void LinkResolver::resolve_invokedynamic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1601 Symbol* method_name = pool->name_ref_at(index);
1602 Symbol* method_signature = pool->signature_ref_at(index);
1603 KlassHandle current_klass = KlassHandle(THREAD, pool->pool_holder());
1604
1605 // Resolve the bootstrap specifier (BSM + optional arguments).
1606 Handle bootstrap_specifier;
1607 // Check if CallSite has been bound already:
1608 ConstantPoolCacheEntry* cpce = pool->invokedynamic_cp_cache_entry_at(index);
1609 if (cpce->is_f1_null()) {
1610 int pool_index = cpce->constant_pool_index();
1611 oop bsm_info = pool->resolve_bootstrap_specifier_at(pool_index, THREAD);
1612 wrap_invokedynamic_exception(CHECK);
1613 assert(bsm_info != NULL, "");
1614 // FIXME: Cache this once per BootstrapMethods entry, not once per CONSTANT_InvokeDynamic.
1615 bootstrap_specifier = Handle(THREAD, bsm_info);
1616 }
1617 if (!cpce->is_f1_null()) {
1618 methodHandle method( THREAD, cpce->f1_as_method());
1619 Handle appendix( THREAD, cpce->appendix_if_resolved(pool));
1620 Handle method_type(THREAD, cpce->method_type_if_resolved(pool));
1621 result.set_handle(method, appendix, method_type, THREAD);
1622 wrap_invokedynamic_exception(CHECK);
1623 return;
1624 }
1625
1626 if (TraceMethodHandles) {
1627 ResourceMark rm(THREAD);
1628 tty->print_cr("resolve_invokedynamic #%d %s %s in %s",
1629 ConstantPool::decode_invokedynamic_index(index),
1630 method_name->as_C_string(), method_signature->as_C_string(),
1631 current_klass->name()->as_C_string());
1632 tty->print(" BSM info: "); bootstrap_specifier->print();
1633 }
1634
1635 resolve_dynamic_call(result, bootstrap_specifier, method_name, method_signature, current_klass, CHECK);
1636 }
1637
1638 void LinkResolver::resolve_dynamic_call(CallInfo& result,
1639 Handle bootstrap_specifier,
1640 Symbol* method_name, Symbol* method_signature,
1641 KlassHandle current_klass,
1642 TRAPS) {
1643 // JSR 292: this must resolve to an implicitly generated method MH.linkToCallSite(*...)
1644 // The appendix argument is likely to be a freshly-created CallSite.
1645 Handle resolved_appendix;
1646 Handle resolved_method_type;
1647 methodHandle resolved_method =
1648 SystemDictionary::find_dynamic_call_site_invoker(current_klass,
1649 bootstrap_specifier,
1650 method_name, method_signature,
1651 &resolved_appendix,
1652 &resolved_method_type,
1653 THREAD);
1654 wrap_invokedynamic_exception(CHECK);
1655 result.set_handle(resolved_method, resolved_appendix, resolved_method_type, THREAD);
1656 wrap_invokedynamic_exception(CHECK);
1657 }