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 _current_klass = KlassHandle(THREAD, pool->pool_holder());
235
236 // Coming from the constant pool always checks access
237 _check_access = true;
238 }
239
240 char* LinkInfo::method_string() const {
241 return Method::name_and_sig_as_C_string(_resolved_klass(), _name, _signature);
242 }
243
244 #ifndef PRODUCT
245 void LinkInfo::print() {
246 ResourceMark rm;
247 tty->print_cr("Link resolved_klass=%s name=%s signature=%s current_klass=%s check_access=%s",
248 _resolved_klass->name()->as_C_string(),
249 _name->as_C_string(),
250 _signature->as_C_string(),
251 _current_klass.is_null() ? "(none)" : _current_klass->name()->as_C_string(),
252 _check_access ? "true" : "false");
253 }
254 #endif // PRODUCT
255 //------------------------------------------------------------------------------------------------------------------------
256 // Klass resolution
257
258 void LinkResolver::check_klass_accessability(KlassHandle ref_klass, KlassHandle sel_klass, TRAPS) {
259 Reflection::VerifyClassAccessResults vca_result =
260 Reflection::verify_class_access(ref_klass(), sel_klass(), true);
261 if (vca_result != Reflection::ACCESS_OK) {
262 ResourceMark rm(THREAD);
263 char* msg = Reflection::verify_class_access_msg(ref_klass(), sel_klass(), vca_result);
264 if (msg == NULL) {
265 Exceptions::fthrow(
266 THREAD_AND_LOCATION,
267 vmSymbols::java_lang_IllegalAccessError(),
268 "failed to access class %s from class %s",
269 sel_klass->external_name(),
270 ref_klass->external_name());
271 } else {
272 // Use module specific message returned by verify_class_access_msg().
273 Exceptions::fthrow(
274 THREAD_AND_LOCATION,
275 vmSymbols::java_lang_IllegalAccessError(),
276 "%s", msg);
277 }
278 }
279 }
280
281 //------------------------------------------------------------------------------------------------------------------------
282 // Method resolution
283 //
284 // According to JVM spec. $5.4.3c & $5.4.3d
285
286 // Look up method in klasses, including static methods
287 // Then look up local default methods
288 methodHandle LinkResolver::lookup_method_in_klasses(const LinkInfo& link_info,
289 bool checkpolymorphism,
290 bool in_imethod_resolve, TRAPS) {
291 KlassHandle klass = link_info.resolved_klass();
292 Symbol* name = link_info.name();
293 Symbol* signature = link_info.signature();
294
295 // Ignore overpasses so statics can be found during resolution
296 Method* result = klass->uncached_lookup_method(name, signature, Klass::skip_overpass);
297
298 if (klass->is_array_klass()) {
299 // Only consider klass and super klass for arrays
300 return methodHandle(THREAD, result);
301 }
302
303 InstanceKlass* ik = InstanceKlass::cast(klass());
304
305 // JDK 8, JVMS 5.4.3.4: Interface method resolution should
306 // ignore static and non-public methods of java.lang.Object,
307 // like clone, finalize, registerNatives.
308 if (in_imethod_resolve &&
309 result != NULL &&
310 ik->is_interface() &&
311 (result->is_static() || !result->is_public()) &&
312 result->method_holder() == SystemDictionary::Object_klass()) {
313 result = NULL;
314 }
315
316 // Before considering default methods, check for an overpass in the
317 // current class if a method has not been found.
318 if (result == NULL) {
319 result = ik->find_method(name, signature);
320 }
321
322 if (result == NULL) {
323 Array<Method*>* default_methods = ik->default_methods();
324 if (default_methods != NULL) {
325 result = InstanceKlass::find_method(default_methods, name, signature);
326 }
327 }
328
329 if (checkpolymorphism && result != NULL) {
330 vmIntrinsics::ID iid = result->intrinsic_id();
331 if (MethodHandles::is_signature_polymorphic(iid)) {
332 // Do not link directly to these. The VM must produce a synthetic one using lookup_polymorphic_method.
333 return NULL;
334 }
335 }
336 return methodHandle(THREAD, result);
337 }
338
339 // returns first instance method
340 // Looks up method in classes, then looks up local default methods
341 methodHandle LinkResolver::lookup_instance_method_in_klasses(KlassHandle klass,
342 Symbol* name,
343 Symbol* signature, TRAPS) {
344 Method* result = klass->uncached_lookup_method(name, signature, Klass::find_overpass);
345
346 while (result != NULL && result->is_static() && result->method_holder()->super() != NULL) {
347 Klass* super_klass = result->method_holder()->super();
348 result = super_klass->uncached_lookup_method(name, signature, Klass::find_overpass);
349 }
350
351 if (klass->is_array_klass()) {
352 // Only consider klass and super klass for arrays
353 return methodHandle(THREAD, result);
354 }
355
356 if (result == NULL) {
357 Array<Method*>* default_methods = InstanceKlass::cast(klass())->default_methods();
358 if (default_methods != NULL) {
359 result = InstanceKlass::find_method(default_methods, name, signature);
360 assert(result == NULL || !result->is_static(), "static defaults not allowed");
361 }
362 }
363 return methodHandle(THREAD, result);
364 }
365
366 int LinkResolver::vtable_index_of_interface_method(KlassHandle klass,
367 const methodHandle& resolved_method) {
368
369 int vtable_index = Method::invalid_vtable_index;
370 Symbol* name = resolved_method->name();
371 Symbol* signature = resolved_method->signature();
372 InstanceKlass* ik = InstanceKlass::cast(klass());
373
374 // First check in default method array
375 if (!resolved_method->is_abstract() && ik->default_methods() != NULL) {
376 int index = InstanceKlass::find_method_index(ik->default_methods(),
377 name, signature, Klass::find_overpass,
378 Klass::find_static, Klass::find_private);
379 if (index >= 0 ) {
380 vtable_index = ik->default_vtable_indices()->at(index);
381 }
382 }
383 if (vtable_index == Method::invalid_vtable_index) {
384 // get vtable_index for miranda methods
385 ResourceMark rm;
386 klassVtable *vt = ik->vtable();
387 vtable_index = vt->index_of_miranda(name, signature);
388 }
389 return vtable_index;
390 }
391
392 methodHandle LinkResolver::lookup_method_in_interfaces(const LinkInfo& cp_info, TRAPS) {
393 InstanceKlass *ik = InstanceKlass::cast(cp_info.resolved_klass()());
394
395 // Specify 'true' in order to skip default methods when searching the
396 // interfaces. Function lookup_method_in_klasses() already looked for
397 // the method in the default methods table.
398 return methodHandle(THREAD,
399 ik->lookup_method_in_all_interfaces(cp_info.name(), cp_info.signature(),
400 Klass::skip_defaults));
401 }
402
403 methodHandle LinkResolver::lookup_polymorphic_method(
404 const LinkInfo& link_info,
405 Handle *appendix_result_or_null,
406 Handle *method_type_result,
407 TRAPS) {
408 KlassHandle klass = link_info.resolved_klass();
409 Symbol* name = link_info.name();
410 Symbol* full_signature = link_info.signature();
411
412 vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name);
413 if (TraceMethodHandles) {
414 ResourceMark rm(THREAD);
415 tty->print_cr("lookup_polymorphic_method iid=%s %s.%s%s",
416 vmIntrinsics::name_at(iid), klass->external_name(),
417 name->as_C_string(), full_signature->as_C_string());
418 }
419 if ((klass() == SystemDictionary::MethodHandle_klass() ||
420 klass() == SystemDictionary::VarHandle_klass()) &&
421 iid != vmIntrinsics::_none) {
422 if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) {
423 // Most of these do not need an up-call to Java to resolve, so can be done anywhere.
424 // Do not erase last argument type (MemberName) if it is a static linkTo method.
425 bool keep_last_arg = MethodHandles::is_signature_polymorphic_static(iid);
426 TempNewSymbol basic_signature =
427 MethodHandles::lookup_basic_type_signature(full_signature, keep_last_arg, CHECK_NULL);
428 if (TraceMethodHandles) {
429 ResourceMark rm(THREAD);
430 tty->print_cr("lookup_polymorphic_method %s %s => basic %s",
431 name->as_C_string(),
432 full_signature->as_C_string(),
433 basic_signature->as_C_string());
434 }
435 methodHandle result = SystemDictionary::find_method_handle_intrinsic(iid,
436 basic_signature,
437 CHECK_NULL);
438 if (result.not_null()) {
439 assert(result->is_method_handle_intrinsic(), "MH.invokeBasic or MH.linkTo* intrinsic");
440 assert(result->intrinsic_id() != vmIntrinsics::_invokeGeneric, "wrong place to find this");
441 assert(basic_signature == result->signature(), "predict the result signature");
442 if (TraceMethodHandles) {
443 ttyLocker ttyl;
444 tty->print("lookup_polymorphic_method => intrinsic ");
445 result->print_on(tty);
446 }
447 }
448 return result;
449 } else if (iid == vmIntrinsics::_invokeGeneric
450 && THREAD->can_call_java()
451 && appendix_result_or_null != NULL) {
452 // This is a method with type-checking semantics.
453 // We will ask Java code to spin an adapter method for it.
454 if (!MethodHandles::enabled()) {
455 // Make sure the Java part of the runtime has been booted up.
456 Klass* natives = SystemDictionary::MethodHandleNatives_klass();
457 if (natives == NULL || InstanceKlass::cast(natives)->is_not_initialized()) {
458 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_invoke_MethodHandleNatives(),
459 Handle(),
460 Handle(),
461 true,
462 CHECK_NULL);
463 }
464 }
465
466 Handle appendix;
467 Handle method_type;
468 methodHandle result = SystemDictionary::find_method_handle_invoker(
469 klass,
470 name,
471 full_signature,
472 link_info.current_klass(),
473 &appendix,
474 &method_type,
475 CHECK_NULL);
476 if (TraceMethodHandles) {
477 ttyLocker ttyl;
478 tty->print("lookup_polymorphic_method => (via Java) ");
479 result->print_on(tty);
480 tty->print(" lookup_polymorphic_method => appendix = ");
481 if (appendix.is_null()) tty->print_cr("(none)");
482 else appendix->print_on(tty);
483 }
484 if (result.not_null()) {
485 #ifdef ASSERT
486 ResourceMark rm(THREAD);
487
488 TempNewSymbol basic_signature =
489 MethodHandles::lookup_basic_type_signature(full_signature, CHECK_NULL);
490 int actual_size_of_params = result->size_of_parameters();
491 int expected_size_of_params = ArgumentSizeComputer(basic_signature).size();
492 // +1 for MethodHandle.this, +1 for trailing MethodType
493 if (!MethodHandles::is_signature_polymorphic_static(iid)) expected_size_of_params += 1;
494 if (appendix.not_null()) expected_size_of_params += 1;
495 if (actual_size_of_params != expected_size_of_params) {
496 tty->print_cr("*** basic_signature=%s", basic_signature->as_C_string());
497 tty->print_cr("*** result for %s: ", vmIntrinsics::name_at(iid));
498 result->print();
499 }
500 assert(actual_size_of_params == expected_size_of_params,
501 "%d != %d", actual_size_of_params, expected_size_of_params);
502 #endif //ASSERT
503
504 assert(appendix_result_or_null != NULL, "");
505 (*appendix_result_or_null) = appendix;
506 (*method_type_result) = method_type;
507 }
508 return result;
509 }
510 }
511 return NULL;
512 }
513
514 void LinkResolver::check_method_accessability(KlassHandle ref_klass,
515 KlassHandle resolved_klass,
516 KlassHandle sel_klass,
517 const methodHandle& sel_method,
518 TRAPS) {
519
520 AccessFlags flags = sel_method->access_flags();
521
522 // Special case: arrays always override "clone". JVMS 2.15.
523 // If the resolved klass is an array class, and the declaring class
524 // is java.lang.Object and the method is "clone", set the flags
525 // to public.
526 //
527 // We'll check for the method name first, as that's most likely
528 // to be false (so we'll short-circuit out of these tests).
529 if (sel_method->name() == vmSymbols::clone_name() &&
530 sel_klass() == SystemDictionary::Object_klass() &&
531 resolved_klass->is_array_klass()) {
532 // We need to change "protected" to "public".
533 assert(flags.is_protected(), "clone not protected?");
534 jint new_flags = flags.as_int();
535 new_flags = new_flags & (~JVM_ACC_PROTECTED);
536 new_flags = new_flags | JVM_ACC_PUBLIC;
537 flags.set_flags(new_flags);
538 }
539 // assert(extra_arg_result_or_null != NULL, "must be able to return extra argument");
540
541 if (!Reflection::verify_field_access(ref_klass(),
542 resolved_klass(),
543 sel_klass(),
544 flags,
545 true)) {
546 ResourceMark rm(THREAD);
547 Exceptions::fthrow(
548 THREAD_AND_LOCATION,
549 vmSymbols::java_lang_IllegalAccessError(),
550 "tried to access method %s.%s%s from class %s",
551 sel_klass->external_name(),
552 sel_method->name()->as_C_string(),
553 sel_method->signature()->as_C_string(),
554 ref_klass->external_name()
555 );
556 return;
557 }
558 }
559
560 methodHandle LinkResolver::resolve_method_statically(Bytecodes::Code code,
561 const constantPoolHandle& pool, int index, TRAPS) {
562 // This method is used only
563 // (1) in C2 from InlineTree::ok_to_inline (via ciMethod::check_call),
564 // and
565 // (2) in Bytecode_invoke::static_target
566 // It appears to fail when applied to an invokeinterface call site.
567 // FIXME: Remove this method and ciMethod::check_call; refactor to use the other LinkResolver entry points.
568 // resolve klass
569 KlassHandle resolved_klass;
570 if (code == Bytecodes::_invokedynamic) {
571 resolved_klass = SystemDictionary::MethodHandle_klass();
572 Symbol* method_name = vmSymbols::invoke_name();
573 Symbol* method_signature = pool->signature_ref_at(index);
574 KlassHandle current_klass(THREAD, pool->pool_holder());
575 LinkInfo link_info(resolved_klass, method_name, method_signature, current_klass);
576 return resolve_method(link_info, /*require_methodref*/false, THREAD);
577 }
578
579 LinkInfo link_info(pool, index, CHECK_NULL);
580 resolved_klass = link_info.resolved_klass();
581
582 if (pool->has_preresolution()
583 || (resolved_klass() == SystemDictionary::MethodHandle_klass() &&
584 MethodHandles::is_signature_polymorphic_name(resolved_klass(), link_info.name()))) {
585 Method* result = ConstantPool::method_at_if_loaded(pool, index);
586 if (result != NULL) {
587 return methodHandle(THREAD, result);
588 }
589 }
590
591 if (code == Bytecodes::_invokeinterface) {
592 return resolve_interface_method(link_info, code, THREAD);
593 } else if (code == Bytecodes::_invokevirtual) {
594 return resolve_method(link_info, /*require_methodref*/true, THREAD);
595 } else if (!resolved_klass->is_interface()) {
596 return resolve_method(link_info, /*require_methodref*/false, THREAD);
597 } else {
598 return resolve_interface_method(link_info, code, THREAD);
599 }
600 }
601
602 // Check and print a loader constraint violation message for method or interface method
603 void LinkResolver::check_method_loader_constraints(const LinkInfo& link_info,
604 const methodHandle& resolved_method,
605 const char* method_type, TRAPS) {
606 Handle current_loader(THREAD, link_info.current_klass()->class_loader());
607 Handle resolved_loader(THREAD, resolved_method->method_holder()->class_loader());
608
609 ResourceMark rm(THREAD);
610 Symbol* failed_type_symbol =
611 SystemDictionary::check_signature_loaders(link_info.signature(), current_loader,
612 resolved_loader, true, CHECK);
613 if (failed_type_symbol != NULL) {
614 const char* msg = "loader constraint violation: when resolving %s"
615 " \"%s\" the class loader (instance of %s) of the current class, %s,"
616 " and the class loader (instance of %s) for the method's defining class, %s, have"
617 " different Class objects for the type %s used in the signature";
618 char* sig = link_info.method_string();
619 const char* loader1_name = SystemDictionary::loader_name(current_loader());
620 char* current = link_info.current_klass()->name()->as_C_string();
621 const char* loader2_name = SystemDictionary::loader_name(resolved_loader());
622 char* target = resolved_method->method_holder()->name()->as_C_string();
623 char* failed_type_name = failed_type_symbol->as_C_string();
624 size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1_name) +
625 strlen(current) + strlen(loader2_name) + strlen(target) +
626 strlen(failed_type_name) + strlen(method_type) + 1;
627 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen);
628 jio_snprintf(buf, buflen, msg, method_type, sig, loader1_name, current, loader2_name,
629 target, failed_type_name);
630 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf);
631 }
632 }
633
634 void LinkResolver::check_field_loader_constraints(Symbol* field, Symbol* sig,
635 KlassHandle current_klass,
636 KlassHandle sel_klass, TRAPS) {
637 Handle ref_loader(THREAD, current_klass->class_loader());
638 Handle sel_loader(THREAD, sel_klass->class_loader());
639
640 ResourceMark rm(THREAD); // needed for check_signature_loaders
641 Symbol* failed_type_symbol =
642 SystemDictionary::check_signature_loaders(sig,
643 ref_loader, sel_loader,
644 false,
645 CHECK);
646 if (failed_type_symbol != NULL) {
647 const char* msg = "loader constraint violation: when resolving field"
648 " \"%s\" the class loader (instance of %s) of the referring class, "
649 "%s, and the class loader (instance of %s) for the field's resolved "
650 "type, %s, have different Class objects for that type";
651 char* field_name = field->as_C_string();
652 const char* loader1_name = SystemDictionary::loader_name(ref_loader());
653 char* sel = sel_klass->name()->as_C_string();
654 const char* loader2_name = SystemDictionary::loader_name(sel_loader());
655 char* failed_type_name = failed_type_symbol->as_C_string();
656 size_t buflen = strlen(msg) + strlen(field_name) + strlen(loader1_name) +
657 strlen(sel) + strlen(loader2_name) + strlen(failed_type_name) + 1;
658 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen);
659 jio_snprintf(buf, buflen, msg, field_name, loader1_name, sel, loader2_name,
660 failed_type_name);
661 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf);
662 }
663 }
664
665 methodHandle LinkResolver::resolve_method(const LinkInfo& link_info,
666 bool require_methodref, TRAPS) {
667
668 Handle nested_exception;
669 KlassHandle resolved_klass = link_info.resolved_klass();
670
671 // 1. check if methodref required, that resolved_klass is not interfacemethodref
672 if (require_methodref && resolved_klass->is_interface()) {
673 ResourceMark rm(THREAD);
674 char buf[200];
675 jio_snprintf(buf, sizeof(buf), "Found interface %s, but class was expected",
676 resolved_klass()->external_name());
677 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
678 }
679
680 // 2. lookup method in resolved klass and its super klasses
681 methodHandle resolved_method = lookup_method_in_klasses(link_info, true, false, CHECK_NULL);
682
683 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) { // not found in the class hierarchy
684 // 3. lookup method in all the interfaces implemented by the resolved klass
685 resolved_method = lookup_method_in_interfaces(link_info, CHECK_NULL);
686
687 if (resolved_method.is_null()) {
688 // JSR 292: see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc
689 resolved_method = lookup_polymorphic_method(link_info, (Handle*)NULL, (Handle*)NULL, THREAD);
690 if (HAS_PENDING_EXCEPTION) {
691 nested_exception = Handle(THREAD, PENDING_EXCEPTION);
692 CLEAR_PENDING_EXCEPTION;
693 }
694 }
695 }
696
697 if (resolved_method.is_null()) {
698 // 4. method lookup failed
699 ResourceMark rm(THREAD);
700 THROW_MSG_CAUSE_(vmSymbols::java_lang_NoSuchMethodError(),
701 Method::name_and_sig_as_C_string(resolved_klass(),
702 link_info.name(),
703 link_info.signature()),
704 nested_exception, NULL);
705 }
706
707 // 5. access checks, access checking may be turned off when calling from within the VM.
708 KlassHandle current_klass = link_info.current_klass();
709 if (link_info.check_access()) {
710 assert(current_klass.not_null() , "current_klass should not be null");
711
712 // check if method can be accessed by the referring class
713 check_method_accessability(current_klass,
714 resolved_klass,
715 KlassHandle(THREAD, resolved_method->method_holder()),
716 resolved_method,
717 CHECK_NULL);
718
719 // check loader constraints
720 check_method_loader_constraints(link_info, resolved_method, "method", CHECK_NULL);
721 }
722
723 return resolved_method;
724 }
725
726 static void trace_method_resolution(const char* prefix,
727 KlassHandle klass,
728 KlassHandle resolved_klass,
729 const methodHandle& method,
730 bool logitables,
731 int index = -1) {
732 #ifndef PRODUCT
733 ResourceMark rm;
734 outputStream* st;
735 if (logitables) {
736 st = Log(itables)::trace_stream();
737 } else {
738 st = Log(vtables)::trace_stream();
739 }
740 st->print("%s%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ",
741 prefix,
742 (klass.is_null() ? "<NULL>" : klass->internal_name()),
743 (resolved_klass.is_null() ? "<NULL>" : resolved_klass->internal_name()),
744 Method::name_and_sig_as_C_string(resolved_klass(),
745 method->name(),
746 method->signature()),
747 method->method_holder()->internal_name());
748 method->print_linkage_flags(st);
749 if (index != -1) {
750 st->print("vtable_index:%d", index);
751 }
752 st->cr();
753 #endif // PRODUCT
754 }
755
756 // Do linktime resolution of a method in the interface within the context of the specied bytecode.
757 methodHandle LinkResolver::resolve_interface_method(const LinkInfo& link_info, Bytecodes::Code code, TRAPS) {
758
759 KlassHandle resolved_klass = link_info.resolved_klass();
760
761 // check if klass is interface
762 if (!resolved_klass->is_interface()) {
763 ResourceMark rm(THREAD);
764 char buf[200];
765 jio_snprintf(buf, sizeof(buf), "Found class %s, but interface was expected", resolved_klass()->external_name());
766 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
767 }
768
769 // lookup method in this interface or its super, java.lang.Object
770 // JDK8: also look for static methods
771 methodHandle resolved_method = lookup_method_in_klasses(link_info, false, true, CHECK_NULL);
772
773 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) {
774 // lookup method in all the super-interfaces
775 resolved_method = lookup_method_in_interfaces(link_info, CHECK_NULL);
776 }
777
778 if (resolved_method.is_null()) {
779 // no method found
780 ResourceMark rm(THREAD);
781 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(),
782 Method::name_and_sig_as_C_string(resolved_klass(),
783 link_info.name(),
784 link_info.signature()));
785 }
786
787 if (link_info.check_access()) {
788 // JDK8 adds non-public interface methods, and accessability check requirement
789 KlassHandle current_klass = link_info.current_klass();
790
791 assert(current_klass.not_null() , "current_klass should not be null");
792
793 // check if method can be accessed by the referring class
794 check_method_accessability(current_klass,
795 resolved_klass,
796 KlassHandle(THREAD, resolved_method->method_holder()),
797 resolved_method,
798 CHECK_NULL);
799
800 check_method_loader_constraints(link_info, resolved_method, "interface method", CHECK_NULL);
801 }
802
803 if (code != Bytecodes::_invokestatic && resolved_method->is_static()) {
804 ResourceMark rm(THREAD);
805 char buf[200];
806 jio_snprintf(buf, sizeof(buf), "Expected instance not static method %s",
807 Method::name_and_sig_as_C_string(resolved_klass(),
808 resolved_method->name(), resolved_method->signature()));
809 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
810 }
811
812 if (code == Bytecodes::_invokeinterface && resolved_method->is_private()) {
813 ResourceMark rm(THREAD);
814 char buf[200];
815
816 KlassHandle current_klass = link_info.current_klass();
817 jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokeinterface: method %s, caller-class:%s",
818 Method::name_and_sig_as_C_string(resolved_klass(),
819 resolved_method->name(),
820 resolved_method->signature()),
821 (current_klass.is_null() ? "<NULL>" : current_klass->internal_name()));
822 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
823 }
824
825 if (log_develop_is_enabled(Trace, itables)) {
826 trace_method_resolution("invokeinterface resolved method: caller-class",
827 link_info.current_klass(), resolved_klass,
828 resolved_method, true);
829 }
830
831 return resolved_method;
832 }
833
834 //------------------------------------------------------------------------------------------------------------------------
835 // Field resolution
836
837 void LinkResolver::check_field_accessability(KlassHandle ref_klass,
838 KlassHandle resolved_klass,
839 KlassHandle sel_klass,
840 const fieldDescriptor& fd,
841 TRAPS) {
842 if (!Reflection::verify_field_access(ref_klass(),
843 resolved_klass(),
844 sel_klass(),
845 fd.access_flags(),
846 true)) {
847 ResourceMark rm(THREAD);
848 Exceptions::fthrow(
849 THREAD_AND_LOCATION,
850 vmSymbols::java_lang_IllegalAccessError(),
851 "tried to access field %s.%s from class %s",
852 sel_klass->external_name(),
853 fd.name()->as_C_string(),
854 ref_klass->external_name()
855 );
856 return;
857 }
858 }
859
860 void LinkResolver::resolve_field_access(fieldDescriptor& fd, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) {
861 LinkInfo link_info(pool, index, CHECK);
862 resolve_field(fd, link_info, byte, true, CHECK);
863 }
864
865 void LinkResolver::resolve_field(fieldDescriptor& fd,
866 const LinkInfo& link_info,
867 Bytecodes::Code byte, bool initialize_class,
868 TRAPS) {
869 assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic ||
870 byte == Bytecodes::_getfield || byte == Bytecodes::_putfield ||
871 byte == Bytecodes::_nofast_getfield || byte == Bytecodes::_nofast_putfield ||
872 (byte == Bytecodes::_nop && !link_info.check_access()), "bad field access bytecode");
873
874 bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic);
875 bool is_put = (byte == Bytecodes::_putfield || byte == Bytecodes::_putstatic || byte == Bytecodes::_nofast_putfield);
876 // Check if there's a resolved klass containing the field
877 KlassHandle resolved_klass = link_info.resolved_klass();
878 Symbol* field = link_info.name();
879 Symbol* sig = link_info.signature();
880
881 if (resolved_klass.is_null()) {
882 ResourceMark rm(THREAD);
883 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
884 }
885
886 // Resolve instance field
887 KlassHandle sel_klass(THREAD, resolved_klass->find_field(field, sig, &fd));
888 // check if field exists; i.e., if a klass containing the field def has been selected
889 if (sel_klass.is_null()) {
890 ResourceMark rm(THREAD);
891 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
892 }
893
894 if (!link_info.check_access())
895 // Access checking may be turned off when calling from within the VM.
896 return;
897
898 // check access
899 KlassHandle current_klass = link_info.current_klass();
900 check_field_accessability(current_klass, resolved_klass, sel_klass, fd, CHECK);
901
902 // check for errors
903 if (is_static != fd.is_static()) {
904 ResourceMark rm(THREAD);
905 char msg[200];
906 jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", resolved_klass()->external_name(), fd.name()->as_C_string());
907 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg);
908 }
909
910 // Final fields can only be accessed from its own class.
911 if (is_put && fd.access_flags().is_final() && sel_klass() != current_klass()) {
912 THROW(vmSymbols::java_lang_IllegalAccessError());
913 }
914
915 // initialize resolved_klass if necessary
916 // note 1: the klass which declared the field must be initialized (i.e, sel_klass)
917 // according to the newest JVM spec (5.5, p.170) - was bug (gri 7/28/99)
918 //
919 // note 2: we don't want to force initialization if we are just checking
920 // if the field access is legal; e.g., during compilation
921 if (is_static && initialize_class) {
922 sel_klass->initialize(CHECK);
923 }
924
925 if (sel_klass() != current_klass()) {
926 check_field_loader_constraints(field, sig, current_klass, sel_klass, CHECK);
927 }
928
929 // return information. note that the klass is set to the actual klass containing the
930 // field, otherwise access of static fields in superclasses will not work.
931 }
932
933
934 //------------------------------------------------------------------------------------------------------------------------
935 // Invoke resolution
936 //
937 // Naming conventions:
938 //
939 // resolved_method the specified method (i.e., static receiver specified via constant pool index)
940 // sel_method the selected method (selected via run-time lookup; e.g., based on dynamic receiver class)
941 // resolved_klass the specified klass (i.e., specified via constant pool index)
942 // recv_klass the receiver klass
943
944
945 void LinkResolver::resolve_static_call(CallInfo& result,
946 const LinkInfo& link_info,
947 bool initialize_class, TRAPS) {
948 methodHandle resolved_method = linktime_resolve_static_method(link_info, CHECK);
949
950 // The resolved class can change as a result of this resolution.
951 KlassHandle resolved_klass = KlassHandle(THREAD, resolved_method->method_holder());
952
953 Method* save_resolved_method = resolved_method();
954 // Initialize klass (this should only happen if everything is ok)
955 if (initialize_class && resolved_klass->should_be_initialized()) {
956 resolved_klass->initialize(CHECK);
957 // Use updated LinkInfo (to reresolve with resolved_klass as method_holder?)
958 LinkInfo new_info(resolved_klass, link_info.name(), link_info.signature(),
959 link_info.current_klass(), link_info.check_access());
960 resolved_method = linktime_resolve_static_method(new_info, CHECK);
961 }
962
963 assert(save_resolved_method == resolved_method(), "does this change?");
964 // setup result
965 result.set_static(resolved_klass, resolved_method, CHECK);
966 }
967
968 // throws linktime exceptions
969 methodHandle LinkResolver::linktime_resolve_static_method(const LinkInfo& link_info, TRAPS) {
970
971 KlassHandle resolved_klass = link_info.resolved_klass();
972 methodHandle resolved_method;
973 if (!resolved_klass->is_interface()) {
974 resolved_method = resolve_method(link_info, /*require_methodref*/false, CHECK_NULL);
975 } else {
976 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokestatic, CHECK_NULL);
977 }
978 assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier");
979
980 // check if static
981 if (!resolved_method->is_static()) {
982 ResourceMark rm(THREAD);
983 char buf[200];
984 jio_snprintf(buf, sizeof(buf), "Expected static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
985 resolved_method->name(),
986 resolved_method->signature()));
987 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
988 }
989 return resolved_method;
990 }
991
992
993 void LinkResolver::resolve_special_call(CallInfo& result,
994 const LinkInfo& link_info,
995 TRAPS) {
996 methodHandle resolved_method = linktime_resolve_special_method(link_info, CHECK);
997 runtime_resolve_special_method(result, resolved_method,
998 link_info.resolved_klass(),
999 link_info.current_klass(),
1000 link_info.check_access(), CHECK);
1001 }
1002
1003 // throws linktime exceptions
1004 methodHandle LinkResolver::linktime_resolve_special_method(const LinkInfo& link_info,
1005 TRAPS) {
1006
1007 // Invokespecial is called for multiple special reasons:
1008 // <init>
1009 // local private method invocation, for classes and interfaces
1010 // superclass.method, which can also resolve to a default method
1011 // and the selected method is recalculated relative to the direct superclass
1012 // superinterface.method, which explicitly does not check shadowing
1013 KlassHandle resolved_klass = link_info.resolved_klass();
1014 methodHandle resolved_method;
1015
1016 if (!resolved_klass->is_interface()) {
1017 resolved_method = resolve_method(link_info, /*require_methodref*/false, CHECK_NULL);
1018 } else {
1019 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokespecial, CHECK_NULL);
1020 }
1021
1022 // check if method name is <init>, that it is found in same klass as static type
1023 if (resolved_method->name() == vmSymbols::object_initializer_name() &&
1024 resolved_method->method_holder() != resolved_klass()) {
1025 ResourceMark rm(THREAD);
1026 Exceptions::fthrow(
1027 THREAD_AND_LOCATION,
1028 vmSymbols::java_lang_NoSuchMethodError(),
1029 "%s: method %s%s not found",
1030 resolved_klass->external_name(),
1031 resolved_method->name()->as_C_string(),
1032 resolved_method->signature()->as_C_string()
1033 );
1034 return NULL;
1035 }
1036
1037 // check if invokespecial's interface method reference is in an indirect superinterface
1038 KlassHandle current_klass = link_info.current_klass();
1039 if (!current_klass.is_null() && resolved_klass->is_interface()) {
1040 Klass *klass_to_check = !InstanceKlass::cast(current_klass())->is_anonymous() ?
1041 current_klass() :
1042 InstanceKlass::cast(current_klass())->host_klass();
1043 // Disable verification for the dynamically-generated reflection bytecodes.
1044 bool is_reflect = klass_to_check->is_subclass_of(
1045 SystemDictionary::reflect_MagicAccessorImpl_klass());
1046
1047 if (!is_reflect &&
1048 !InstanceKlass::cast(klass_to_check)->is_same_or_direct_interface(resolved_klass())) {
1049 ResourceMark rm(THREAD);
1050 char buf[200];
1051 jio_snprintf(buf, sizeof(buf),
1052 "Interface method reference: %s, is in an indirect superinterface of %s",
1053 Method::name_and_sig_as_C_string(resolved_klass(),
1054 resolved_method->name(),
1055 resolved_method->signature()),
1056 current_klass->external_name());
1057 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1058 }
1059 }
1060
1061 // check if not static
1062 if (resolved_method->is_static()) {
1063 ResourceMark rm(THREAD);
1064 char buf[200];
1065 jio_snprintf(buf, sizeof(buf),
1066 "Expecting non-static method %s",
1067 Method::name_and_sig_as_C_string(resolved_klass(),
1068 resolved_method->name(),
1069 resolved_method->signature()));
1070 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1071 }
1072
1073 if (log_develop_is_enabled(Trace, itables)) {
1074 trace_method_resolution("invokespecial resolved method: caller-class:",
1075 current_klass, resolved_klass, resolved_method, true);
1076 }
1077
1078 return resolved_method;
1079 }
1080
1081 // throws runtime exceptions
1082 void LinkResolver::runtime_resolve_special_method(CallInfo& result,
1083 const methodHandle& resolved_method,
1084 KlassHandle resolved_klass,
1085 KlassHandle current_klass,
1086 bool check_access, TRAPS) {
1087
1088 // resolved method is selected method unless we have an old-style lookup
1089 // for a superclass method
1090 // Invokespecial for a superinterface, resolved method is selected method,
1091 // no checks for shadowing
1092 methodHandle sel_method(THREAD, resolved_method());
1093
1094 // check if this is an old-style super call and do a new lookup if so
1095 { KlassHandle method_klass = KlassHandle(THREAD,
1096 resolved_method->method_holder());
1097
1098 if (check_access &&
1099 // a) check if ACC_SUPER flag is set for the current class
1100 (current_klass->is_super() || !AllowNonVirtualCalls) &&
1101 // b) check if the class of the resolved_klass is a superclass
1102 // (not supertype in order to exclude interface classes) of the current class.
1103 // This check is not performed for super.invoke for interface methods
1104 // in super interfaces.
1105 current_klass->is_subclass_of(resolved_klass()) &&
1106 current_klass() != resolved_klass() &&
1107 // c) check if the method is not <init>
1108 resolved_method->name() != vmSymbols::object_initializer_name()) {
1109 // Lookup super method
1110 KlassHandle super_klass(THREAD, current_klass->super());
1111 sel_method = lookup_instance_method_in_klasses(super_klass,
1112 resolved_method->name(),
1113 resolved_method->signature(), CHECK);
1114 // check if found
1115 if (sel_method.is_null()) {
1116 ResourceMark rm(THREAD);
1117 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1118 Method::name_and_sig_as_C_string(resolved_klass(),
1119 resolved_method->name(),
1120 resolved_method->signature()));
1121 }
1122 }
1123 }
1124
1125 // check if not static
1126 if (sel_method->is_static()) {
1127 ResourceMark rm(THREAD);
1128 char buf[200];
1129 jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
1130 resolved_method->name(),
1131 resolved_method->signature()));
1132 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1133 }
1134
1135 // check if abstract
1136 if (sel_method->is_abstract()) {
1137 ResourceMark rm(THREAD);
1138 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1139 Method::name_and_sig_as_C_string(resolved_klass(),
1140 sel_method->name(),
1141 sel_method->signature()));
1142 }
1143
1144 if (log_develop_is_enabled(Trace, itables)) {
1145 trace_method_resolution("invokespecial selected method: resolved-class:",
1146 resolved_klass, resolved_klass, sel_method, true);
1147 }
1148
1149 // setup result
1150 result.set_static(resolved_klass, sel_method, CHECK);
1151 }
1152
1153 void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, KlassHandle receiver_klass,
1154 const LinkInfo& link_info,
1155 bool check_null_and_abstract, TRAPS) {
1156 methodHandle resolved_method = linktime_resolve_virtual_method(link_info, CHECK);
1157 runtime_resolve_virtual_method(result, resolved_method,
1158 link_info.resolved_klass(),
1159 recv, receiver_klass,
1160 check_null_and_abstract, CHECK);
1161 }
1162
1163 // throws linktime exceptions
1164 methodHandle LinkResolver::linktime_resolve_virtual_method(const LinkInfo& link_info,
1165 TRAPS) {
1166 // normal method resolution
1167 methodHandle resolved_method = resolve_method(link_info, /*require_methodref*/true, CHECK_NULL);
1168
1169 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1170 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1171
1172 // check if private interface method
1173 KlassHandle resolved_klass = link_info.resolved_klass();
1174 KlassHandle current_klass = link_info.current_klass();
1175
1176 if (resolved_klass->is_interface() && resolved_method->is_private()) {
1177 ResourceMark rm(THREAD);
1178 char buf[200];
1179 jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokevirtual: method %s, caller-class:%s",
1180 Method::name_and_sig_as_C_string(resolved_klass(),
1181 resolved_method->name(),
1182 resolved_method->signature()),
1183 (current_klass.is_null() ? "<NULL>" : current_klass->internal_name()));
1184 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1185 }
1186
1187 // check if not static
1188 if (resolved_method->is_static()) {
1189 ResourceMark rm(THREAD);
1190 char buf[200];
1191 jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
1192 resolved_method->name(),
1193 resolved_method->signature()));
1194 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1195 }
1196
1197 if (log_develop_is_enabled(Trace, vtables)) {
1198 trace_method_resolution("invokevirtual resolved method: caller-class:",
1199 current_klass, resolved_klass, resolved_method, false);
1200 }
1201
1202 return resolved_method;
1203 }
1204
1205 // throws runtime exceptions
1206 void LinkResolver::runtime_resolve_virtual_method(CallInfo& result,
1207 const methodHandle& resolved_method,
1208 KlassHandle resolved_klass,
1209 Handle recv,
1210 KlassHandle recv_klass,
1211 bool check_null_and_abstract,
1212 TRAPS) {
1213
1214 // setup default return values
1215 int vtable_index = Method::invalid_vtable_index;
1216 methodHandle selected_method;
1217
1218 assert(recv.is_null() || recv->is_oop(), "receiver is not an oop");
1219
1220 // runtime method resolution
1221 if (check_null_and_abstract && recv.is_null()) { // check if receiver exists
1222 THROW(vmSymbols::java_lang_NullPointerException());
1223 }
1224
1225 // Virtual methods cannot be resolved before its klass has been linked, for otherwise the Method*'s
1226 // has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since
1227 // a missing receiver might result in a bogus lookup.
1228 assert(resolved_method->method_holder()->is_linked(), "must be linked");
1229
1230 // do lookup based on receiver klass using the vtable index
1231 if (resolved_method->method_holder()->is_interface()) { // default or miranda method
1232 vtable_index = vtable_index_of_interface_method(resolved_klass,
1233 resolved_method);
1234 assert(vtable_index >= 0 , "we should have valid vtable index at this point");
1235
1236 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1237 } else {
1238 // at this point we are sure that resolved_method is virtual and not
1239 // a default or miranda method; therefore, it must have a valid vtable index.
1240 assert(!resolved_method->has_itable_index(), "");
1241 vtable_index = resolved_method->vtable_index();
1242 // We could get a negative vtable_index for final methods,
1243 // because as an optimization they are they are never put in the vtable,
1244 // unless they override an existing method.
1245 // If we do get a negative, it means the resolved method is the the selected
1246 // method, and it can never be changed by an override.
1247 if (vtable_index == Method::nonvirtual_vtable_index) {
1248 assert(resolved_method->can_be_statically_bound(), "cannot override this method");
1249 selected_method = resolved_method;
1250 } else {
1251 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1252 }
1253 }
1254
1255 // check if method exists
1256 if (selected_method.is_null()) {
1257 ResourceMark rm(THREAD);
1258 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1259 Method::name_and_sig_as_C_string(resolved_klass(),
1260 resolved_method->name(),
1261 resolved_method->signature()));
1262 }
1263
1264 // check if abstract
1265 if (check_null_and_abstract && selected_method->is_abstract()) {
1266 ResourceMark rm(THREAD);
1267 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1268 Method::name_and_sig_as_C_string(resolved_klass(),
1269 selected_method->name(),
1270 selected_method->signature()));
1271 }
1272
1273 if (log_develop_is_enabled(Trace, vtables)) {
1274 trace_method_resolution("invokevirtual selected method: receiver-class:",
1275 recv_klass, resolved_klass, selected_method,
1276 false, vtable_index);
1277 }
1278 // setup result
1279 result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK);
1280 }
1281
1282 void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, KlassHandle recv_klass,
1283 const LinkInfo& link_info,
1284 bool check_null_and_abstract, TRAPS) {
1285 // throws linktime exceptions
1286 methodHandle resolved_method = linktime_resolve_interface_method(link_info, CHECK);
1287 runtime_resolve_interface_method(result, resolved_method,link_info.resolved_klass(),
1288 recv, recv_klass, check_null_and_abstract, CHECK);
1289 }
1290
1291 methodHandle LinkResolver::linktime_resolve_interface_method(const LinkInfo& link_info,
1292 TRAPS) {
1293 // normal interface method resolution
1294 methodHandle resolved_method = resolve_interface_method(link_info, Bytecodes::_invokeinterface, CHECK_NULL);
1295 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1296 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1297
1298 return resolved_method;
1299 }
1300
1301 // throws runtime exceptions
1302 void LinkResolver::runtime_resolve_interface_method(CallInfo& result,
1303 const methodHandle& resolved_method,
1304 KlassHandle resolved_klass,
1305 Handle recv,
1306 KlassHandle recv_klass,
1307 bool check_null_and_abstract, TRAPS) {
1308 // check if receiver exists
1309 if (check_null_and_abstract && recv.is_null()) {
1310 THROW(vmSymbols::java_lang_NullPointerException());
1311 }
1312
1313 // check if receiver klass implements the resolved interface
1314 if (!recv_klass->is_subtype_of(resolved_klass())) {
1315 ResourceMark rm(THREAD);
1316 char buf[200];
1317 jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s",
1318 recv_klass()->external_name(),
1319 resolved_klass()->external_name());
1320 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1321 }
1322
1323 // do lookup based on receiver klass
1324 // This search must match the linktime preparation search for itable initialization
1325 // to correctly enforce loader constraints for interface method inheritance
1326 methodHandle sel_method = lookup_instance_method_in_klasses(recv_klass,
1327 resolved_method->name(),
1328 resolved_method->signature(), CHECK);
1329 if (sel_method.is_null() && !check_null_and_abstract) {
1330 // In theory this is a harmless placeholder value, but
1331 // in practice leaving in null affects the nsk default method tests.
1332 // This needs further study.
1333 sel_method = resolved_method;
1334 }
1335 // check if method exists
1336 if (sel_method.is_null()) {
1337 ResourceMark rm(THREAD);
1338 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1339 Method::name_and_sig_as_C_string(recv_klass(),
1340 resolved_method->name(),
1341 resolved_method->signature()));
1342 }
1343 // check access
1344 // Throw Illegal Access Error if sel_method is not public.
1345 if (!sel_method->is_public()) {
1346 ResourceMark rm(THREAD);
1347 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(),
1348 Method::name_and_sig_as_C_string(recv_klass(),
1349 sel_method->name(),
1350 sel_method->signature()));
1351 }
1352 // check if abstract
1353 if (check_null_and_abstract && sel_method->is_abstract()) {
1354 ResourceMark rm(THREAD);
1355 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1356 Method::name_and_sig_as_C_string(recv_klass(),
1357 sel_method->name(),
1358 sel_method->signature()));
1359 }
1360
1361 if (log_develop_is_enabled(Trace, itables)) {
1362 trace_method_resolution("invokeinterface selected method: receiver-class",
1363 recv_klass, resolved_klass, sel_method, true);
1364 }
1365 // setup result
1366 if (!resolved_method->has_itable_index()) {
1367 int vtable_index = resolved_method->vtable_index();
1368 assert(vtable_index == sel_method->vtable_index(), "sanity check");
1369 result.set_virtual(resolved_klass, recv_klass, resolved_method, sel_method, vtable_index, CHECK);
1370 } else {
1371 int itable_index = resolved_method()->itable_index();
1372 result.set_interface(resolved_klass, recv_klass, resolved_method, sel_method, itable_index, CHECK);
1373 }
1374 }
1375
1376
1377 methodHandle LinkResolver::linktime_resolve_interface_method_or_null(
1378 const LinkInfo& link_info) {
1379 EXCEPTION_MARK;
1380 methodHandle method_result = linktime_resolve_interface_method(link_info, THREAD);
1381 if (HAS_PENDING_EXCEPTION) {
1382 CLEAR_PENDING_EXCEPTION;
1383 return methodHandle();
1384 } else {
1385 return method_result;
1386 }
1387 }
1388
1389 methodHandle LinkResolver::linktime_resolve_virtual_method_or_null(
1390 const LinkInfo& link_info) {
1391 EXCEPTION_MARK;
1392 methodHandle method_result = linktime_resolve_virtual_method(link_info, THREAD);
1393 if (HAS_PENDING_EXCEPTION) {
1394 CLEAR_PENDING_EXCEPTION;
1395 return methodHandle();
1396 } else {
1397 return method_result;
1398 }
1399 }
1400
1401 methodHandle LinkResolver::resolve_virtual_call_or_null(
1402 KlassHandle receiver_klass,
1403 const LinkInfo& link_info) {
1404 EXCEPTION_MARK;
1405 CallInfo info;
1406 resolve_virtual_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1407 if (HAS_PENDING_EXCEPTION) {
1408 CLEAR_PENDING_EXCEPTION;
1409 return methodHandle();
1410 }
1411 return info.selected_method();
1412 }
1413
1414 methodHandle LinkResolver::resolve_interface_call_or_null(
1415 KlassHandle receiver_klass,
1416 const LinkInfo& link_info) {
1417 EXCEPTION_MARK;
1418 CallInfo info;
1419 resolve_interface_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1420 if (HAS_PENDING_EXCEPTION) {
1421 CLEAR_PENDING_EXCEPTION;
1422 return methodHandle();
1423 }
1424 return info.selected_method();
1425 }
1426
1427 int LinkResolver::resolve_virtual_vtable_index(KlassHandle receiver_klass,
1428 const LinkInfo& link_info) {
1429 EXCEPTION_MARK;
1430 CallInfo info;
1431 resolve_virtual_call(info, Handle(), receiver_klass, link_info,
1432 /*check_null_or_abstract*/false, THREAD);
1433 if (HAS_PENDING_EXCEPTION) {
1434 CLEAR_PENDING_EXCEPTION;
1435 return Method::invalid_vtable_index;
1436 }
1437 return info.vtable_index();
1438 }
1439
1440 methodHandle LinkResolver::resolve_static_call_or_null(const LinkInfo& link_info) {
1441 EXCEPTION_MARK;
1442 CallInfo info;
1443 resolve_static_call(info, link_info, /*initialize_class*/false, THREAD);
1444 if (HAS_PENDING_EXCEPTION) {
1445 CLEAR_PENDING_EXCEPTION;
1446 return methodHandle();
1447 }
1448 return info.selected_method();
1449 }
1450
1451 methodHandle LinkResolver::resolve_special_call_or_null(const LinkInfo& link_info) {
1452 EXCEPTION_MARK;
1453 CallInfo info;
1454 resolve_special_call(info, link_info, THREAD);
1455 if (HAS_PENDING_EXCEPTION) {
1456 CLEAR_PENDING_EXCEPTION;
1457 return methodHandle();
1458 }
1459 return info.selected_method();
1460 }
1461
1462
1463
1464 //------------------------------------------------------------------------------------------------------------------------
1465 // ConstantPool entries
1466
1467 void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) {
1468 switch (byte) {
1469 case Bytecodes::_invokestatic : resolve_invokestatic (result, pool, index, CHECK); break;
1470 case Bytecodes::_invokespecial : resolve_invokespecial (result, pool, index, CHECK); break;
1471 case Bytecodes::_invokevirtual : resolve_invokevirtual (result, recv, pool, index, CHECK); break;
1472 case Bytecodes::_invokehandle : resolve_invokehandle (result, pool, index, CHECK); break;
1473 case Bytecodes::_invokedynamic : resolve_invokedynamic (result, pool, index, CHECK); break;
1474 case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break;
1475 }
1476 return;
1477 }
1478
1479 void LinkResolver::resolve_invoke(CallInfo& result, Handle& recv,
1480 const methodHandle& attached_method,
1481 Bytecodes::Code byte, TRAPS) {
1482 KlassHandle defc = attached_method->method_holder();
1483 Symbol* name = attached_method->name();
1484 Symbol* type = attached_method->signature();
1485 LinkInfo link_info(defc, name, type, KlassHandle(), /*check_access=*/false);
1486 switch(byte) {
1487 case Bytecodes::_invokevirtual:
1488 resolve_virtual_call(result, recv, recv->klass(), link_info,
1489 /*check_null_and_abstract=*/true, CHECK);
1490 break;
1491 case Bytecodes::_invokeinterface:
1492 resolve_interface_call(result, recv, recv->klass(), link_info,
1493 /*check_null_and_abstract=*/true, CHECK);
1494 break;
1495 case Bytecodes::_invokestatic:
1496 resolve_static_call(result, link_info, /*initialize_class=*/false, CHECK);
1497 break;
1498 case Bytecodes::_invokespecial:
1499 resolve_special_call(result, link_info, CHECK);
1500 break;
1501 default:
1502 fatal("bad call: %s", Bytecodes::name(byte));
1503 }
1504 }
1505
1506 void LinkResolver::resolve_invokestatic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1507 LinkInfo link_info(pool, index, CHECK);
1508 resolve_static_call(result, link_info, /*initialize_class*/true, CHECK);
1509 }
1510
1511
1512 void LinkResolver::resolve_invokespecial(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1513 LinkInfo link_info(pool, index, CHECK);
1514 resolve_special_call(result, link_info, CHECK);
1515 }
1516
1517
1518 void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv,
1519 const constantPoolHandle& pool, int index,
1520 TRAPS) {
1521
1522 LinkInfo link_info(pool, index, CHECK);
1523 KlassHandle recvrKlass (THREAD, recv.is_null() ? (Klass*)NULL : recv->klass());
1524 resolve_virtual_call(result, recv, recvrKlass, link_info, /*check_null_or_abstract*/true, CHECK);
1525 }
1526
1527
1528 void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, TRAPS) {
1529 LinkInfo link_info(pool, index, CHECK);
1530 KlassHandle recvrKlass (THREAD, recv.is_null() ? (Klass*)NULL : recv->klass());
1531 resolve_interface_call(result, recv, recvrKlass, link_info, true, CHECK);
1532 }
1533
1534
1535 void LinkResolver::resolve_invokehandle(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1536 // This guy is reached from InterpreterRuntime::resolve_invokehandle.
1537 LinkInfo link_info(pool, index, CHECK);
1538 if (TraceMethodHandles) {
1539 ResourceMark rm(THREAD);
1540 tty->print_cr("resolve_invokehandle %s %s", link_info.name()->as_C_string(),
1541 link_info.signature()->as_C_string());
1542 }
1543 resolve_handle_call(result, link_info, CHECK);
1544 }
1545
1546 void LinkResolver::resolve_handle_call(CallInfo& result,
1547 const LinkInfo& link_info,
1548 TRAPS) {
1549 // JSR 292: this must be an implicitly generated method MethodHandle.invokeExact(*...) or similar
1550 KlassHandle resolved_klass = link_info.resolved_klass();
1551 assert(resolved_klass() == SystemDictionary::MethodHandle_klass() ||
1552 resolved_klass() == SystemDictionary::VarHandle_klass(), "");
1553 assert(MethodHandles::is_signature_polymorphic_name(link_info.name()), "");
1554 Handle resolved_appendix;
1555 Handle resolved_method_type;
1556 methodHandle resolved_method = lookup_polymorphic_method(link_info,
1557 &resolved_appendix, &resolved_method_type, CHECK);
1558 result.set_handle(resolved_klass, resolved_method, resolved_appendix, resolved_method_type, CHECK);
1559 }
1560
1561 static void wrap_invokedynamic_exception(TRAPS) {
1562 if (HAS_PENDING_EXCEPTION) {
1563 if (TraceMethodHandles) {
1564 tty->print_cr("invokedynamic throws BSME for " INTPTR_FORMAT, p2i((void *)PENDING_EXCEPTION));
1565 PENDING_EXCEPTION->print();
1566 }
1567 if (PENDING_EXCEPTION->is_a(SystemDictionary::BootstrapMethodError_klass())) {
1568 // throw these guys, since they are already wrapped
1569 return;
1570 }
1571 if (!PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1572 // intercept only LinkageErrors which might have failed to wrap
1573 return;
1574 }
1575 // See the "Linking Exceptions" section for the invokedynamic instruction in the JVMS.
1576 Handle nested_exception(THREAD, PENDING_EXCEPTION);
1577 CLEAR_PENDING_EXCEPTION;
1578 THROW_CAUSE(vmSymbols::java_lang_BootstrapMethodError(), nested_exception)
1579 }
1580 }
1581
1582 void LinkResolver::resolve_invokedynamic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1583 Symbol* method_name = pool->name_ref_at(index);
1584 Symbol* method_signature = pool->signature_ref_at(index);
1585 KlassHandle current_klass = KlassHandle(THREAD, pool->pool_holder());
1586
1587 // Resolve the bootstrap specifier (BSM + optional arguments).
1588 Handle bootstrap_specifier;
1589 // Check if CallSite has been bound already:
1590 ConstantPoolCacheEntry* cpce = pool->invokedynamic_cp_cache_entry_at(index);
1591 if (cpce->is_f1_null()) {
1592 int pool_index = cpce->constant_pool_index();
1593 oop bsm_info = pool->resolve_bootstrap_specifier_at(pool_index, THREAD);
1594 wrap_invokedynamic_exception(CHECK);
1595 assert(bsm_info != NULL, "");
1596 // FIXME: Cache this once per BootstrapMethods entry, not once per CONSTANT_InvokeDynamic.
1597 bootstrap_specifier = Handle(THREAD, bsm_info);
1598 }
1599 if (!cpce->is_f1_null()) {
1600 methodHandle method( THREAD, cpce->f1_as_method());
1601 Handle appendix( THREAD, cpce->appendix_if_resolved(pool));
1602 Handle method_type(THREAD, cpce->method_type_if_resolved(pool));
1603 result.set_handle(method, appendix, method_type, THREAD);
1604 wrap_invokedynamic_exception(CHECK);
1605 return;
1606 }
1607
1608 if (TraceMethodHandles) {
1609 ResourceMark rm(THREAD);
1610 tty->print_cr("resolve_invokedynamic #%d %s %s in %s",
1611 ConstantPool::decode_invokedynamic_index(index),
1612 method_name->as_C_string(), method_signature->as_C_string(),
1613 current_klass->name()->as_C_string());
1614 tty->print(" BSM info: "); bootstrap_specifier->print();
1615 }
1616
1617 resolve_dynamic_call(result, bootstrap_specifier, method_name, method_signature, current_klass, CHECK);
1618 }
1619
1620 void LinkResolver::resolve_dynamic_call(CallInfo& result,
1621 Handle bootstrap_specifier,
1622 Symbol* method_name, Symbol* method_signature,
1623 KlassHandle current_klass,
1624 TRAPS) {
1625 // JSR 292: this must resolve to an implicitly generated method MH.linkToCallSite(*...)
1626 // The appendix argument is likely to be a freshly-created CallSite.
1627 Handle resolved_appendix;
1628 Handle resolved_method_type;
1629 methodHandle resolved_method =
1630 SystemDictionary::find_dynamic_call_site_invoker(current_klass,
1631 bootstrap_specifier,
1632 method_name, method_signature,
1633 &resolved_appendix,
1634 &resolved_method_type,
1635 THREAD);
1636 wrap_invokedynamic_exception(CHECK);
1637 result.set_handle(resolved_method, resolved_appendix, resolved_method_type, THREAD);
1638 wrap_invokedynamic_exception(CHECK);
1639 }