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, methodHandle current_method, 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 _current_method = current_method;
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, NULL);
577 return resolve_method(link_info, /*require_methodref*/false, THREAD);
578 }
579
580 LinkInfo link_info(pool, index, NULL, 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, /*require_methodref*/true, THREAD);
596 } else if (!resolved_klass->is_interface()) {
597 return resolve_method(link_info, /*require_methodref*/false, 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 bool require_methodref, TRAPS) {
668
669 Handle nested_exception;
670 KlassHandle resolved_klass = link_info.resolved_klass();
671
672 // 1. check if methodref required, that resolved_klass is not interfacemethodref
673 if (require_methodref && 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. lookup method in resolved klass and its super klasses
682 methodHandle resolved_method = lookup_method_in_klasses(link_info, true, false, CHECK_NULL);
683
684 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) { // not found in the class hierarchy
685 // 3. lookup method in all the interfaces implemented by the resolved klass
686 resolved_method = lookup_method_in_interfaces(link_info, CHECK_NULL);
687
688 if (resolved_method.is_null()) {
689 // JSR 292: see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc
690 resolved_method = lookup_polymorphic_method(link_info, (Handle*)NULL, (Handle*)NULL, THREAD);
691 if (HAS_PENDING_EXCEPTION) {
692 nested_exception = Handle(THREAD, PENDING_EXCEPTION);
693 CLEAR_PENDING_EXCEPTION;
694 }
695 }
696 }
697
698 if (resolved_method.is_null()) {
699 // 4. method lookup failed
700 ResourceMark rm(THREAD);
701 THROW_MSG_CAUSE_(vmSymbols::java_lang_NoSuchMethodError(),
702 Method::name_and_sig_as_C_string(resolved_klass(),
703 link_info.name(),
704 link_info.signature()),
705 nested_exception, NULL);
706 }
707
708 // 5. access checks, access checking may be turned off when calling from within the VM.
709 KlassHandle current_klass = link_info.current_klass();
710 if (link_info.check_access()) {
711 assert(current_klass.not_null() , "current_klass should not be null");
712
713 // check if method can be accessed by the referring class
714 check_method_accessability(current_klass,
715 resolved_klass,
716 KlassHandle(THREAD, resolved_method->method_holder()),
717 resolved_method,
718 CHECK_NULL);
719
720 // check loader constraints
721 check_method_loader_constraints(link_info, resolved_method, "method", CHECK_NULL);
722 }
723
724 return resolved_method;
725 }
726
727 static void trace_method_resolution(const char* prefix,
728 KlassHandle klass,
729 KlassHandle resolved_klass,
730 const methodHandle& method,
731 bool logitables,
732 int index = -1) {
733 #ifndef PRODUCT
734 ResourceMark rm;
735 outputStream* st;
736 if (logitables) {
737 st = Log(itables)::trace_stream();
738 } else {
739 st = Log(vtables)::trace_stream();
740 }
741 st->print("%s%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ",
742 prefix,
743 (klass.is_null() ? "<NULL>" : klass->internal_name()),
744 (resolved_klass.is_null() ? "<NULL>" : resolved_klass->internal_name()),
745 Method::name_and_sig_as_C_string(resolved_klass(),
746 method->name(),
747 method->signature()),
748 method->method_holder()->internal_name());
749 method->print_linkage_flags(st);
750 if (index != -1) {
751 st->print("vtable_index:%d", index);
752 }
753 st->cr();
754 #endif // PRODUCT
755 }
756
757 // Do linktime resolution of a method in the interface within the context of the specied bytecode.
758 methodHandle LinkResolver::resolve_interface_method(const LinkInfo& link_info, Bytecodes::Code code, TRAPS) {
759
760 KlassHandle resolved_klass = link_info.resolved_klass();
761
762 // check if klass is interface
763 if (!resolved_klass->is_interface()) {
764 ResourceMark rm(THREAD);
765 char buf[200];
766 jio_snprintf(buf, sizeof(buf), "Found class %s, but interface was expected", resolved_klass()->external_name());
767 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
768 }
769
770 // lookup method in this interface or its super, java.lang.Object
771 // JDK8: also look for static methods
772 methodHandle resolved_method = lookup_method_in_klasses(link_info, false, true, CHECK_NULL);
773
774 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) {
775 // lookup method in all the super-interfaces
776 resolved_method = lookup_method_in_interfaces(link_info, CHECK_NULL);
777 }
778
779 if (resolved_method.is_null()) {
780 // no method found
781 ResourceMark rm(THREAD);
782 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(),
783 Method::name_and_sig_as_C_string(resolved_klass(),
784 link_info.name(),
785 link_info.signature()));
786 }
787
788 if (link_info.check_access()) {
789 // JDK8 adds non-public interface methods, and accessability check requirement
790 KlassHandle current_klass = link_info.current_klass();
791
792 assert(current_klass.not_null() , "current_klass should not be null");
793
794 // check if method can be accessed by the referring class
795 check_method_accessability(current_klass,
796 resolved_klass,
797 KlassHandle(THREAD, resolved_method->method_holder()),
798 resolved_method,
799 CHECK_NULL);
800
801 check_method_loader_constraints(link_info, resolved_method, "interface method", CHECK_NULL);
802 }
803
804 if (code != Bytecodes::_invokestatic && resolved_method->is_static()) {
805 ResourceMark rm(THREAD);
806 char buf[200];
807 jio_snprintf(buf, sizeof(buf), "Expected instance not static method %s",
808 Method::name_and_sig_as_C_string(resolved_klass(),
809 resolved_method->name(), resolved_method->signature()));
810 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
811 }
812
813 if (code == Bytecodes::_invokeinterface && resolved_method->is_private()) {
814 ResourceMark rm(THREAD);
815 char buf[200];
816
817 KlassHandle current_klass = link_info.current_klass();
818 jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokeinterface: method %s, caller-class:%s",
819 Method::name_and_sig_as_C_string(resolved_klass(),
820 resolved_method->name(),
821 resolved_method->signature()),
822 (current_klass.is_null() ? "<NULL>" : current_klass->internal_name()));
823 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
824 }
825
826 if (log_develop_is_enabled(Trace, itables)) {
827 trace_method_resolution("invokeinterface resolved method: caller-class",
828 link_info.current_klass(), resolved_klass,
829 resolved_method, true);
830 }
831
832 return resolved_method;
833 }
834
835 //------------------------------------------------------------------------------------------------------------------------
836 // Field resolution
837
838 void LinkResolver::check_field_accessability(KlassHandle ref_klass,
839 KlassHandle resolved_klass,
840 KlassHandle sel_klass,
841 const fieldDescriptor& fd,
842 TRAPS) {
843 if (!Reflection::verify_field_access(ref_klass(),
844 resolved_klass(),
845 sel_klass(),
846 fd.access_flags(),
847 true)) {
848 ResourceMark rm(THREAD);
849 Exceptions::fthrow(
850 THREAD_AND_LOCATION,
851 vmSymbols::java_lang_IllegalAccessError(),
852 "tried to access field %s.%s from class %s",
853 sel_klass->external_name(),
854 fd.name()->as_C_string(),
855 ref_klass->external_name()
856 );
857 return;
858 }
859 }
860
861 void LinkResolver::resolve_field_access(fieldDescriptor& fd, const constantPoolHandle& pool, int index, const methodHandle& method, Bytecodes::Code byte, TRAPS) {
862 LinkInfo link_info(pool, index, method, CHECK);
863 resolve_field(fd, link_info, byte, true, CHECK);
864 }
865
866 void LinkResolver::resolve_field(fieldDescriptor& fd,
867 const LinkInfo& link_info,
868 Bytecodes::Code byte, bool initialize_class,
869 TRAPS) {
870 assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic ||
871 byte == Bytecodes::_getfield || byte == Bytecodes::_putfield ||
872 byte == Bytecodes::_nofast_getfield || byte == Bytecodes::_nofast_putfield ||
873 (byte == Bytecodes::_nop && !link_info.check_access()), "bad field access bytecode");
874
875 bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic);
876 bool is_put = (byte == Bytecodes::_putfield || byte == Bytecodes::_putstatic || byte == Bytecodes::_nofast_putfield);
877 // Check if there's a resolved klass containing the field
878 KlassHandle resolved_klass = link_info.resolved_klass();
879 Symbol* field = link_info.name();
880 Symbol* sig = link_info.signature();
881
882 if (resolved_klass.is_null()) {
883 ResourceMark rm(THREAD);
884 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
885 }
886
887 // Resolve instance field
888 KlassHandle sel_klass(THREAD, resolved_klass->find_field(field, sig, &fd));
889 // check if field exists; i.e., if a klass containing the field def has been selected
890 if (sel_klass.is_null()) {
891 ResourceMark rm(THREAD);
892 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
893 }
894
895 if (!link_info.check_access())
896 // Access checking may be turned off when calling from within the VM.
897 return;
898
899 // check access
900 KlassHandle current_klass = link_info.current_klass();
901 check_field_accessability(current_klass, resolved_klass, sel_klass, fd, CHECK);
902
903 // check for errors
904 if (is_static != fd.is_static()) {
905 ResourceMark rm(THREAD);
906 char msg[200];
907 jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", resolved_klass()->external_name(), fd.name()->as_C_string());
908 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg);
909 }
910
911 // A final field can be modified only
912 // (1) by methods declared in the class declaring the field and
913 // (2) by the <clinit> method (in case of a static field)
914 // or by the <init> method (in case of an instance field).
915 if (is_put && fd.access_flags().is_final()) {
916 methodHandle m = link_info.current_method();
917 assert(!m.is_null(), "information about the current method must be available for 'put' bytecodes");
918 Symbol* method_name = m->name();
919 if (sel_klass() != current_klass() ||
920 (byte == Bytecodes::_putstatic && fd.is_static() && method_name != vmSymbols::class_initializer_name()) ||
921 ((byte == Bytecodes::_putfield || byte == Bytecodes::_nofast_putfield) && !fd.is_static() && method_name != vmSymbols::object_initializer_name())
922 ) {
923 THROW(vmSymbols::java_lang_IllegalAccessError());
924 }
925 }
926
927 // initialize resolved_klass if necessary
928 // note 1: the klass which declared the field must be initialized (i.e, sel_klass)
929 // according to the newest JVM spec (5.5, p.170) - was bug (gri 7/28/99)
930 //
931 // note 2: we don't want to force initialization if we are just checking
932 // if the field access is legal; e.g., during compilation
933 if (is_static && initialize_class) {
934 sel_klass->initialize(CHECK);
935 }
936
937 if (sel_klass() != current_klass()) {
938 check_field_loader_constraints(field, sig, current_klass, sel_klass, CHECK);
939 }
940
941 // return information. note that the klass is set to the actual klass containing the
942 // field, otherwise access of static fields in superclasses will not work.
943 }
944
945
946 //------------------------------------------------------------------------------------------------------------------------
947 // Invoke resolution
948 //
949 // Naming conventions:
950 //
951 // resolved_method the specified method (i.e., static receiver specified via constant pool index)
952 // sel_method the selected method (selected via run-time lookup; e.g., based on dynamic receiver class)
953 // resolved_klass the specified klass (i.e., specified via constant pool index)
954 // recv_klass the receiver klass
955
956
957 void LinkResolver::resolve_static_call(CallInfo& result,
958 const LinkInfo& link_info,
959 bool initialize_class, TRAPS) {
960 methodHandle resolved_method = linktime_resolve_static_method(link_info, CHECK);
961
962 // The resolved class can change as a result of this resolution.
963 KlassHandle resolved_klass = KlassHandle(THREAD, resolved_method->method_holder());
964
965 Method* save_resolved_method = resolved_method();
966 // Initialize klass (this should only happen if everything is ok)
967 if (initialize_class && resolved_klass->should_be_initialized()) {
968 resolved_klass->initialize(CHECK);
969 // Use updated LinkInfo (to reresolve with resolved_klass as method_holder?)
970 LinkInfo new_info(resolved_klass, link_info.name(), link_info.signature(),
971 link_info.current_klass(), NULL, link_info.check_access());
972 resolved_method = linktime_resolve_static_method(new_info, CHECK);
973 }
974
975 assert(save_resolved_method == resolved_method(), "does this change?");
976 // setup result
977 result.set_static(resolved_klass, resolved_method, CHECK);
978 }
979
980 // throws linktime exceptions
981 methodHandle LinkResolver::linktime_resolve_static_method(const LinkInfo& link_info, TRAPS) {
982
983 KlassHandle resolved_klass = link_info.resolved_klass();
984 methodHandle resolved_method;
985 if (!resolved_klass->is_interface()) {
986 resolved_method = resolve_method(link_info, /*require_methodref*/false, CHECK_NULL);
987 } else {
988 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokestatic, CHECK_NULL);
989 }
990 assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier");
991
992 // check if static
993 if (!resolved_method->is_static()) {
994 ResourceMark rm(THREAD);
995 char buf[200];
996 jio_snprintf(buf, sizeof(buf), "Expected static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
997 resolved_method->name(),
998 resolved_method->signature()));
999 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1000 }
1001 return resolved_method;
1002 }
1003
1004
1005 void LinkResolver::resolve_special_call(CallInfo& result,
1006 const LinkInfo& link_info,
1007 TRAPS) {
1008 methodHandle resolved_method = linktime_resolve_special_method(link_info, CHECK);
1009 runtime_resolve_special_method(result, resolved_method,
1010 link_info.resolved_klass(),
1011 link_info.current_klass(),
1012 link_info.check_access(), CHECK);
1013 }
1014
1015 // throws linktime exceptions
1016 methodHandle LinkResolver::linktime_resolve_special_method(const LinkInfo& link_info,
1017 TRAPS) {
1018
1019 // Invokespecial is called for multiple special reasons:
1020 // <init>
1021 // local private method invocation, for classes and interfaces
1022 // superclass.method, which can also resolve to a default method
1023 // and the selected method is recalculated relative to the direct superclass
1024 // superinterface.method, which explicitly does not check shadowing
1025 KlassHandle resolved_klass = link_info.resolved_klass();
1026 methodHandle resolved_method;
1027
1028 if (!resolved_klass->is_interface()) {
1029 resolved_method = resolve_method(link_info, /*require_methodref*/false, CHECK_NULL);
1030 } else {
1031 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokespecial, CHECK_NULL);
1032 }
1033
1034 // check if method name is <init>, that it is found in same klass as static type
1035 if (resolved_method->name() == vmSymbols::object_initializer_name() &&
1036 resolved_method->method_holder() != resolved_klass()) {
1037 ResourceMark rm(THREAD);
1038 Exceptions::fthrow(
1039 THREAD_AND_LOCATION,
1040 vmSymbols::java_lang_NoSuchMethodError(),
1041 "%s: method %s%s not found",
1042 resolved_klass->external_name(),
1043 resolved_method->name()->as_C_string(),
1044 resolved_method->signature()->as_C_string()
1045 );
1046 return NULL;
1047 }
1048
1049 // check if invokespecial's interface method reference is in an indirect superinterface
1050 KlassHandle current_klass = link_info.current_klass();
1051 if (!current_klass.is_null() && resolved_klass->is_interface()) {
1052 Klass *klass_to_check = !InstanceKlass::cast(current_klass())->is_anonymous() ?
1053 current_klass() :
1054 InstanceKlass::cast(current_klass())->host_klass();
1055 // Disable verification for the dynamically-generated reflection bytecodes.
1056 bool is_reflect = klass_to_check->is_subclass_of(
1057 SystemDictionary::reflect_MagicAccessorImpl_klass());
1058
1059 if (!is_reflect &&
1060 !InstanceKlass::cast(klass_to_check)->is_same_or_direct_interface(resolved_klass())) {
1061 ResourceMark rm(THREAD);
1062 char buf[200];
1063 jio_snprintf(buf, sizeof(buf),
1064 "Interface method reference: %s, is in an indirect superinterface of %s",
1065 Method::name_and_sig_as_C_string(resolved_klass(),
1066 resolved_method->name(),
1067 resolved_method->signature()),
1068 current_klass->external_name());
1069 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1070 }
1071 }
1072
1073 // check if not static
1074 if (resolved_method->is_static()) {
1075 ResourceMark rm(THREAD);
1076 char buf[200];
1077 jio_snprintf(buf, sizeof(buf),
1078 "Expecting non-static method %s",
1079 Method::name_and_sig_as_C_string(resolved_klass(),
1080 resolved_method->name(),
1081 resolved_method->signature()));
1082 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1083 }
1084
1085 if (log_develop_is_enabled(Trace, itables)) {
1086 trace_method_resolution("invokespecial resolved method: caller-class:",
1087 current_klass, resolved_klass, resolved_method, true);
1088 }
1089
1090 return resolved_method;
1091 }
1092
1093 // throws runtime exceptions
1094 void LinkResolver::runtime_resolve_special_method(CallInfo& result,
1095 const methodHandle& resolved_method,
1096 KlassHandle resolved_klass,
1097 KlassHandle current_klass,
1098 bool check_access, TRAPS) {
1099
1100 // resolved method is selected method unless we have an old-style lookup
1101 // for a superclass method
1102 // Invokespecial for a superinterface, resolved method is selected method,
1103 // no checks for shadowing
1104 methodHandle sel_method(THREAD, resolved_method());
1105
1106 // check if this is an old-style super call and do a new lookup if so
1107 { KlassHandle method_klass = KlassHandle(THREAD,
1108 resolved_method->method_holder());
1109
1110 if (check_access &&
1111 // a) check if ACC_SUPER flag is set for the current class
1112 (current_klass->is_super() || !AllowNonVirtualCalls) &&
1113 // b) check if the class of the resolved_klass is a superclass
1114 // (not supertype in order to exclude interface classes) of the current class.
1115 // This check is not performed for super.invoke for interface methods
1116 // in super interfaces.
1117 current_klass->is_subclass_of(resolved_klass()) &&
1118 current_klass() != resolved_klass() &&
1119 // c) check if the method is not <init>
1120 resolved_method->name() != vmSymbols::object_initializer_name()) {
1121 // Lookup super method
1122 KlassHandle super_klass(THREAD, current_klass->super());
1123 sel_method = lookup_instance_method_in_klasses(super_klass,
1124 resolved_method->name(),
1125 resolved_method->signature(), CHECK);
1126 // check if found
1127 if (sel_method.is_null()) {
1128 ResourceMark rm(THREAD);
1129 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1130 Method::name_and_sig_as_C_string(resolved_klass(),
1131 resolved_method->name(),
1132 resolved_method->signature()));
1133 }
1134 }
1135 }
1136
1137 // check if not static
1138 if (sel_method->is_static()) {
1139 ResourceMark rm(THREAD);
1140 char buf[200];
1141 jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
1142 resolved_method->name(),
1143 resolved_method->signature()));
1144 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1145 }
1146
1147 // check if abstract
1148 if (sel_method->is_abstract()) {
1149 ResourceMark rm(THREAD);
1150 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1151 Method::name_and_sig_as_C_string(resolved_klass(),
1152 sel_method->name(),
1153 sel_method->signature()));
1154 }
1155
1156 if (log_develop_is_enabled(Trace, itables)) {
1157 trace_method_resolution("invokespecial selected method: resolved-class:",
1158 resolved_klass, resolved_klass, sel_method, true);
1159 }
1160
1161 // setup result
1162 result.set_static(resolved_klass, sel_method, CHECK);
1163 }
1164
1165 void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, KlassHandle receiver_klass,
1166 const LinkInfo& link_info,
1167 bool check_null_and_abstract, TRAPS) {
1168 methodHandle resolved_method = linktime_resolve_virtual_method(link_info, CHECK);
1169 runtime_resolve_virtual_method(result, resolved_method,
1170 link_info.resolved_klass(),
1171 recv, receiver_klass,
1172 check_null_and_abstract, CHECK);
1173 }
1174
1175 // throws linktime exceptions
1176 methodHandle LinkResolver::linktime_resolve_virtual_method(const LinkInfo& link_info,
1177 TRAPS) {
1178 // normal method resolution
1179 methodHandle resolved_method = resolve_method(link_info, /*require_methodref*/true, CHECK_NULL);
1180
1181 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1182 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1183
1184 // check if private interface method
1185 KlassHandle resolved_klass = link_info.resolved_klass();
1186 KlassHandle current_klass = link_info.current_klass();
1187
1188 if (resolved_klass->is_interface() && resolved_method->is_private()) {
1189 ResourceMark rm(THREAD);
1190 char buf[200];
1191 jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokevirtual: method %s, caller-class:%s",
1192 Method::name_and_sig_as_C_string(resolved_klass(),
1193 resolved_method->name(),
1194 resolved_method->signature()),
1195 (current_klass.is_null() ? "<NULL>" : current_klass->internal_name()));
1196 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1197 }
1198
1199 // check if not static
1200 if (resolved_method->is_static()) {
1201 ResourceMark rm(THREAD);
1202 char buf[200];
1203 jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
1204 resolved_method->name(),
1205 resolved_method->signature()));
1206 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1207 }
1208
1209 if (log_develop_is_enabled(Trace, vtables)) {
1210 trace_method_resolution("invokevirtual resolved method: caller-class:",
1211 current_klass, resolved_klass, resolved_method, false);
1212 }
1213
1214 return resolved_method;
1215 }
1216
1217 // throws runtime exceptions
1218 void LinkResolver::runtime_resolve_virtual_method(CallInfo& result,
1219 const methodHandle& resolved_method,
1220 KlassHandle resolved_klass,
1221 Handle recv,
1222 KlassHandle recv_klass,
1223 bool check_null_and_abstract,
1224 TRAPS) {
1225
1226 // setup default return values
1227 int vtable_index = Method::invalid_vtable_index;
1228 methodHandle selected_method;
1229
1230 assert(recv.is_null() || recv->is_oop(), "receiver is not an oop");
1231
1232 // runtime method resolution
1233 if (check_null_and_abstract && recv.is_null()) { // check if receiver exists
1234 THROW(vmSymbols::java_lang_NullPointerException());
1235 }
1236
1237 // Virtual methods cannot be resolved before its klass has been linked, for otherwise the Method*'s
1238 // has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since
1239 // a missing receiver might result in a bogus lookup.
1240 assert(resolved_method->method_holder()->is_linked(), "must be linked");
1241
1242 // do lookup based on receiver klass using the vtable index
1243 if (resolved_method->method_holder()->is_interface()) { // default or miranda method
1244 vtable_index = vtable_index_of_interface_method(resolved_klass,
1245 resolved_method);
1246 assert(vtable_index >= 0 , "we should have valid vtable index at this point");
1247
1248 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1249 } else {
1250 // at this point we are sure that resolved_method is virtual and not
1251 // a default or miranda method; therefore, it must have a valid vtable index.
1252 assert(!resolved_method->has_itable_index(), "");
1253 vtable_index = resolved_method->vtable_index();
1254 // We could get a negative vtable_index for final methods,
1255 // because as an optimization they are they are never put in the vtable,
1256 // unless they override an existing method.
1257 // If we do get a negative, it means the resolved method is the the selected
1258 // method, and it can never be changed by an override.
1259 if (vtable_index == Method::nonvirtual_vtable_index) {
1260 assert(resolved_method->can_be_statically_bound(), "cannot override this method");
1261 selected_method = resolved_method;
1262 } else {
1263 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1264 }
1265 }
1266
1267 // check if method exists
1268 if (selected_method.is_null()) {
1269 ResourceMark rm(THREAD);
1270 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1271 Method::name_and_sig_as_C_string(resolved_klass(),
1272 resolved_method->name(),
1273 resolved_method->signature()));
1274 }
1275
1276 // check if abstract
1277 if (check_null_and_abstract && selected_method->is_abstract()) {
1278 ResourceMark rm(THREAD);
1279 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1280 Method::name_and_sig_as_C_string(resolved_klass(),
1281 selected_method->name(),
1282 selected_method->signature()));
1283 }
1284
1285 if (log_develop_is_enabled(Trace, vtables)) {
1286 trace_method_resolution("invokevirtual selected method: receiver-class:",
1287 recv_klass, resolved_klass, selected_method,
1288 false, vtable_index);
1289 }
1290 // setup result
1291 result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK);
1292 }
1293
1294 void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, KlassHandle recv_klass,
1295 const LinkInfo& link_info,
1296 bool check_null_and_abstract, TRAPS) {
1297 // throws linktime exceptions
1298 methodHandle resolved_method = linktime_resolve_interface_method(link_info, CHECK);
1299 runtime_resolve_interface_method(result, resolved_method,link_info.resolved_klass(),
1300 recv, recv_klass, check_null_and_abstract, CHECK);
1301 }
1302
1303 methodHandle LinkResolver::linktime_resolve_interface_method(const LinkInfo& link_info,
1304 TRAPS) {
1305 // normal interface method resolution
1306 methodHandle resolved_method = resolve_interface_method(link_info, Bytecodes::_invokeinterface, CHECK_NULL);
1307 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1308 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1309
1310 return resolved_method;
1311 }
1312
1313 // throws runtime exceptions
1314 void LinkResolver::runtime_resolve_interface_method(CallInfo& result,
1315 const methodHandle& resolved_method,
1316 KlassHandle resolved_klass,
1317 Handle recv,
1318 KlassHandle recv_klass,
1319 bool check_null_and_abstract, TRAPS) {
1320 // check if receiver exists
1321 if (check_null_and_abstract && recv.is_null()) {
1322 THROW(vmSymbols::java_lang_NullPointerException());
1323 }
1324
1325 // check if receiver klass implements the resolved interface
1326 if (!recv_klass->is_subtype_of(resolved_klass())) {
1327 ResourceMark rm(THREAD);
1328 char buf[200];
1329 jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s",
1330 recv_klass()->external_name(),
1331 resolved_klass()->external_name());
1332 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1333 }
1334
1335 // do lookup based on receiver klass
1336 // This search must match the linktime preparation search for itable initialization
1337 // to correctly enforce loader constraints for interface method inheritance
1338 methodHandle sel_method = lookup_instance_method_in_klasses(recv_klass,
1339 resolved_method->name(),
1340 resolved_method->signature(), CHECK);
1341 if (sel_method.is_null() && !check_null_and_abstract) {
1342 // In theory this is a harmless placeholder value, but
1343 // in practice leaving in null affects the nsk default method tests.
1344 // This needs further study.
1345 sel_method = resolved_method;
1346 }
1347 // check if method exists
1348 if (sel_method.is_null()) {
1349 ResourceMark rm(THREAD);
1350 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1351 Method::name_and_sig_as_C_string(recv_klass(),
1352 resolved_method->name(),
1353 resolved_method->signature()));
1354 }
1355 // check access
1356 // Throw Illegal Access Error if sel_method is not public.
1357 if (!sel_method->is_public()) {
1358 ResourceMark rm(THREAD);
1359 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(),
1360 Method::name_and_sig_as_C_string(recv_klass(),
1361 sel_method->name(),
1362 sel_method->signature()));
1363 }
1364 // check if abstract
1365 if (check_null_and_abstract && sel_method->is_abstract()) {
1366 ResourceMark rm(THREAD);
1367 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1368 Method::name_and_sig_as_C_string(recv_klass(),
1369 sel_method->name(),
1370 sel_method->signature()));
1371 }
1372
1373 if (log_develop_is_enabled(Trace, itables)) {
1374 trace_method_resolution("invokeinterface selected method: receiver-class",
1375 recv_klass, resolved_klass, sel_method, true);
1376 }
1377 // setup result
1378 if (!resolved_method->has_itable_index()) {
1379 int vtable_index = resolved_method->vtable_index();
1380 assert(vtable_index == sel_method->vtable_index(), "sanity check");
1381 result.set_virtual(resolved_klass, recv_klass, resolved_method, sel_method, vtable_index, CHECK);
1382 } else {
1383 int itable_index = resolved_method()->itable_index();
1384 result.set_interface(resolved_klass, recv_klass, resolved_method, sel_method, itable_index, CHECK);
1385 }
1386 }
1387
1388
1389 methodHandle LinkResolver::linktime_resolve_interface_method_or_null(
1390 const LinkInfo& link_info) {
1391 EXCEPTION_MARK;
1392 methodHandle method_result = linktime_resolve_interface_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::linktime_resolve_virtual_method_or_null(
1402 const LinkInfo& link_info) {
1403 EXCEPTION_MARK;
1404 methodHandle method_result = linktime_resolve_virtual_method(link_info, THREAD);
1405 if (HAS_PENDING_EXCEPTION) {
1406 CLEAR_PENDING_EXCEPTION;
1407 return methodHandle();
1408 } else {
1409 return method_result;
1410 }
1411 }
1412
1413 methodHandle LinkResolver::resolve_virtual_call_or_null(
1414 KlassHandle receiver_klass,
1415 const LinkInfo& link_info) {
1416 EXCEPTION_MARK;
1417 CallInfo info;
1418 resolve_virtual_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1419 if (HAS_PENDING_EXCEPTION) {
1420 CLEAR_PENDING_EXCEPTION;
1421 return methodHandle();
1422 }
1423 return info.selected_method();
1424 }
1425
1426 methodHandle LinkResolver::resolve_interface_call_or_null(
1427 KlassHandle receiver_klass,
1428 const LinkInfo& link_info) {
1429 EXCEPTION_MARK;
1430 CallInfo info;
1431 resolve_interface_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1432 if (HAS_PENDING_EXCEPTION) {
1433 CLEAR_PENDING_EXCEPTION;
1434 return methodHandle();
1435 }
1436 return info.selected_method();
1437 }
1438
1439 int LinkResolver::resolve_virtual_vtable_index(KlassHandle receiver_klass,
1440 const LinkInfo& link_info) {
1441 EXCEPTION_MARK;
1442 CallInfo info;
1443 resolve_virtual_call(info, Handle(), receiver_klass, link_info,
1444 /*check_null_or_abstract*/false, THREAD);
1445 if (HAS_PENDING_EXCEPTION) {
1446 CLEAR_PENDING_EXCEPTION;
1447 return Method::invalid_vtable_index;
1448 }
1449 return info.vtable_index();
1450 }
1451
1452 methodHandle LinkResolver::resolve_static_call_or_null(const LinkInfo& link_info) {
1453 EXCEPTION_MARK;
1454 CallInfo info;
1455 resolve_static_call(info, link_info, /*initialize_class*/false, THREAD);
1456 if (HAS_PENDING_EXCEPTION) {
1457 CLEAR_PENDING_EXCEPTION;
1458 return methodHandle();
1459 }
1460 return info.selected_method();
1461 }
1462
1463 methodHandle LinkResolver::resolve_special_call_or_null(const LinkInfo& link_info) {
1464 EXCEPTION_MARK;
1465 CallInfo info;
1466 resolve_special_call(info, link_info, THREAD);
1467 if (HAS_PENDING_EXCEPTION) {
1468 CLEAR_PENDING_EXCEPTION;
1469 return methodHandle();
1470 }
1471 return info.selected_method();
1472 }
1473
1474
1475
1476 //------------------------------------------------------------------------------------------------------------------------
1477 // ConstantPool entries
1478
1479 void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) {
1480 switch (byte) {
1481 case Bytecodes::_invokestatic : resolve_invokestatic (result, pool, index, CHECK); break;
1482 case Bytecodes::_invokespecial : resolve_invokespecial (result, pool, index, CHECK); break;
1483 case Bytecodes::_invokevirtual : resolve_invokevirtual (result, recv, pool, index, CHECK); break;
1484 case Bytecodes::_invokehandle : resolve_invokehandle (result, pool, index, CHECK); break;
1485 case Bytecodes::_invokedynamic : resolve_invokedynamic (result, pool, index, CHECK); break;
1486 case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break;
1487 }
1488 return;
1489 }
1490
1491 void LinkResolver::resolve_invoke(CallInfo& result, Handle& recv,
1492 const methodHandle& attached_method,
1493 Bytecodes::Code byte, TRAPS) {
1494 KlassHandle defc = attached_method->method_holder();
1495 Symbol* name = attached_method->name();
1496 Symbol* type = attached_method->signature();
1497 LinkInfo link_info(defc, name, type, KlassHandle(), NULL, /*check_access=*/false);
1498 switch(byte) {
1499 case Bytecodes::_invokevirtual:
1500 resolve_virtual_call(result, recv, recv->klass(), link_info,
1501 /*check_null_and_abstract=*/true, CHECK);
1502 break;
1503 case Bytecodes::_invokeinterface:
1504 resolve_interface_call(result, recv, recv->klass(), link_info,
1505 /*check_null_and_abstract=*/true, CHECK);
1506 break;
1507 case Bytecodes::_invokestatic:
1508 resolve_static_call(result, link_info, /*initialize_class=*/false, CHECK);
1509 break;
1510 case Bytecodes::_invokespecial:
1511 resolve_special_call(result, link_info, CHECK);
1512 break;
1513 default:
1514 fatal("bad call: %s", Bytecodes::name(byte));
1515 }
1516 }
1517
1518 void LinkResolver::resolve_invokestatic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1519 LinkInfo link_info(pool, index, NULL, CHECK);
1520 resolve_static_call(result, link_info, /*initialize_class*/true, CHECK);
1521 }
1522
1523
1524 void LinkResolver::resolve_invokespecial(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1525 LinkInfo link_info(pool, index, NULL, CHECK);
1526 resolve_special_call(result, link_info, CHECK);
1527 }
1528
1529
1530 void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv,
1531 const constantPoolHandle& pool, int index,
1532 TRAPS) {
1533
1534 LinkInfo link_info(pool, index, NULL, CHECK);
1535 KlassHandle recvrKlass (THREAD, recv.is_null() ? (Klass*)NULL : recv->klass());
1536 resolve_virtual_call(result, recv, recvrKlass, link_info, /*check_null_or_abstract*/true, CHECK);
1537 }
1538
1539
1540 void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, TRAPS) {
1541 LinkInfo link_info(pool, index, NULL, CHECK);
1542 KlassHandle recvrKlass (THREAD, recv.is_null() ? (Klass*)NULL : recv->klass());
1543 resolve_interface_call(result, recv, recvrKlass, link_info, true, CHECK);
1544 }
1545
1546
1547 void LinkResolver::resolve_invokehandle(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1548 // This guy is reached from InterpreterRuntime::resolve_invokehandle.
1549 LinkInfo link_info(pool, index, NULL, CHECK);
1550 if (TraceMethodHandles) {
1551 ResourceMark rm(THREAD);
1552 tty->print_cr("resolve_invokehandle %s %s", link_info.name()->as_C_string(),
1553 link_info.signature()->as_C_string());
1554 }
1555 resolve_handle_call(result, link_info, CHECK);
1556 }
1557
1558 void LinkResolver::resolve_handle_call(CallInfo& result,
1559 const LinkInfo& link_info,
1560 TRAPS) {
1561 // JSR 292: this must be an implicitly generated method MethodHandle.invokeExact(*...) or similar
1562 KlassHandle resolved_klass = link_info.resolved_klass();
1563 assert(resolved_klass() == SystemDictionary::MethodHandle_klass() ||
1564 resolved_klass() == SystemDictionary::VarHandle_klass(), "");
1565 assert(MethodHandles::is_signature_polymorphic_name(link_info.name()), "");
1566 Handle resolved_appendix;
1567 Handle resolved_method_type;
1568 methodHandle resolved_method = lookup_polymorphic_method(link_info,
1569 &resolved_appendix, &resolved_method_type, CHECK);
1570 result.set_handle(resolved_klass, resolved_method, resolved_appendix, resolved_method_type, CHECK);
1571 }
1572
1573 static void wrap_invokedynamic_exception(TRAPS) {
1574 if (HAS_PENDING_EXCEPTION) {
1575 if (TraceMethodHandles) {
1576 tty->print_cr("invokedynamic throws BSME for " INTPTR_FORMAT, p2i((void *)PENDING_EXCEPTION));
1577 PENDING_EXCEPTION->print();
1578 }
1579 if (PENDING_EXCEPTION->is_a(SystemDictionary::BootstrapMethodError_klass())) {
1580 // throw these guys, since they are already wrapped
1581 return;
1582 }
1583 if (!PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1584 // intercept only LinkageErrors which might have failed to wrap
1585 return;
1586 }
1587 // See the "Linking Exceptions" section for the invokedynamic instruction in the JVMS.
1588 Handle nested_exception(THREAD, PENDING_EXCEPTION);
1589 CLEAR_PENDING_EXCEPTION;
1590 THROW_CAUSE(vmSymbols::java_lang_BootstrapMethodError(), nested_exception)
1591 }
1592 }
1593
1594 void LinkResolver::resolve_invokedynamic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1595 Symbol* method_name = pool->name_ref_at(index);
1596 Symbol* method_signature = pool->signature_ref_at(index);
1597 KlassHandle current_klass = KlassHandle(THREAD, pool->pool_holder());
1598
1599 // Resolve the bootstrap specifier (BSM + optional arguments).
1600 Handle bootstrap_specifier;
1601 // Check if CallSite has been bound already:
1602 ConstantPoolCacheEntry* cpce = pool->invokedynamic_cp_cache_entry_at(index);
1603 if (cpce->is_f1_null()) {
1604 int pool_index = cpce->constant_pool_index();
1605 oop bsm_info = pool->resolve_bootstrap_specifier_at(pool_index, THREAD);
1606 wrap_invokedynamic_exception(CHECK);
1607 assert(bsm_info != NULL, "");
1608 // FIXME: Cache this once per BootstrapMethods entry, not once per CONSTANT_InvokeDynamic.
1609 bootstrap_specifier = Handle(THREAD, bsm_info);
1610 }
1611 if (!cpce->is_f1_null()) {
1612 methodHandle method( THREAD, cpce->f1_as_method());
1613 Handle appendix( THREAD, cpce->appendix_if_resolved(pool));
1614 Handle method_type(THREAD, cpce->method_type_if_resolved(pool));
1615 result.set_handle(method, appendix, method_type, THREAD);
1616 wrap_invokedynamic_exception(CHECK);
1617 return;
1618 }
1619
1620 if (TraceMethodHandles) {
1621 ResourceMark rm(THREAD);
1622 tty->print_cr("resolve_invokedynamic #%d %s %s in %s",
1623 ConstantPool::decode_invokedynamic_index(index),
1624 method_name->as_C_string(), method_signature->as_C_string(),
1625 current_klass->name()->as_C_string());
1626 tty->print(" BSM info: "); bootstrap_specifier->print();
1627 }
1628
1629 resolve_dynamic_call(result, bootstrap_specifier, method_name, method_signature, current_klass, CHECK);
1630 }
1631
1632 void LinkResolver::resolve_dynamic_call(CallInfo& result,
1633 Handle bootstrap_specifier,
1634 Symbol* method_name, Symbol* method_signature,
1635 KlassHandle current_klass,
1636 TRAPS) {
1637 // JSR 292: this must resolve to an implicitly generated method MH.linkToCallSite(*...)
1638 // The appendix argument is likely to be a freshly-created CallSite.
1639 Handle resolved_appendix;
1640 Handle resolved_method_type;
1641 methodHandle resolved_method =
1642 SystemDictionary::find_dynamic_call_site_invoker(current_klass,
1643 bootstrap_specifier,
1644 method_name, method_signature,
1645 &resolved_appendix,
1646 &resolved_method_type,
1647 THREAD);
1648 wrap_invokedynamic_exception(CHECK);
1649 result.set_handle(resolved_method, resolved_appendix, resolved_method_type, THREAD);
1650 wrap_invokedynamic_exception(CHECK);
1651 }