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, const methodHandle& resolved_method,
97 Handle resolved_appendix,
98 Handle resolved_method_type, TRAPS) {
99 if (resolved_method.is_null()) {
100 THROW_MSG(vmSymbols::java_lang_InternalError(), "resolved method is null");
101 }
102
103 // @@@ refine assert for VarHandle
104 /*
105 assert(resolved_method->intrinsic_id() == vmIntrinsics::_invokeBasic ||
106 resolved_method->is_compiled_lambda_form(),
107 "linkMethod must return one of these");
108 */
109
110 int vtable_index = Method::nonvirtual_vtable_index;
111 assert(!resolved_method->has_vtable_index(), "");
112 set_common(resolved_klass, resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK);
113 _resolved_appendix = resolved_appendix;
114 _resolved_method_type = resolved_method_type;
115 }
116
117 void CallInfo::set_common(KlassHandle resolved_klass,
118 KlassHandle selected_klass,
119 const methodHandle& resolved_method,
120 const methodHandle& selected_method,
121 CallKind kind,
122 int index,
123 TRAPS) {
124 assert(resolved_method->signature() == selected_method->signature(), "signatures must correspond");
125 _resolved_klass = resolved_klass;
126 _selected_klass = selected_klass;
127 _resolved_method = resolved_method;
128 _selected_method = selected_method;
129 _call_kind = kind;
130 _call_index = index;
131 _resolved_appendix = Handle();
132 DEBUG_ONLY(verify()); // verify before making side effects
133
134 if (CompilationPolicy::must_be_compiled(selected_method)) {
135 // This path is unusual, mostly used by the '-Xcomp' stress test mode.
136
137 // Note: with several active threads, the must_be_compiled may be true
138 // while can_be_compiled is false; remove assert
139 // assert(CompilationPolicy::can_be_compiled(selected_method), "cannot compile");
140 if (!THREAD->can_call_java()) {
141 // don't force compilation, resolve was on behalf of compiler
142 return;
143 }
144 if (selected_method->method_holder()->is_not_initialized()) {
145 // 'is_not_initialized' means not only '!is_initialized', but also that
146 // initialization has not been started yet ('!being_initialized')
147 // Do not force compilation of methods in uninitialized classes.
148 // Note that doing this would throw an assert later,
149 // in CompileBroker::compile_method.
150 // We sometimes use the link resolver to do reflective lookups
151 // even before classes are initialized.
152 return;
153 }
154 CompileBroker::compile_method(selected_method, InvocationEntryBci,
155 CompilationPolicy::policy()->initial_compile_level(),
156 methodHandle(), 0, "must_be_compiled", CHECK);
157 }
158 }
159
160 // utility query for unreflecting a method
161 CallInfo::CallInfo(Method* resolved_method, Klass* resolved_klass) {
162 Klass* resolved_method_holder = resolved_method->method_holder();
163 if (resolved_klass == NULL) { // 2nd argument defaults to holder of 1st
164 resolved_klass = resolved_method_holder;
165 }
166 _resolved_klass = resolved_klass;
167 _selected_klass = resolved_klass;
168 _resolved_method = resolved_method;
169 _selected_method = resolved_method;
170 // classify:
171 CallKind kind = CallInfo::unknown_kind;
172 int index = resolved_method->vtable_index();
173 if (resolved_method->can_be_statically_bound()) {
174 kind = CallInfo::direct_call;
175 } else if (!resolved_method_holder->is_interface()) {
176 // Could be an Object method inherited into an interface, but still a vtable call.
177 kind = CallInfo::vtable_call;
178 } else if (!resolved_klass->is_interface()) {
179 // A default or miranda method. Compute the vtable index.
180 ResourceMark rm;
181 klassVtable* vt = resolved_klass->vtable();
182 index = LinkResolver::vtable_index_of_interface_method(resolved_klass,
183 resolved_method);
184 assert(index >= 0 , "we should have valid vtable index at this point");
185
186 kind = CallInfo::vtable_call;
187 } else if (resolved_method->has_vtable_index()) {
188 // Can occur if an interface redeclares a method of Object.
189
190 #ifdef ASSERT
191 // Ensure that this is really the case.
192 KlassHandle object_klass = SystemDictionary::Object_klass();
193 Method * object_resolved_method = object_klass()->vtable()->method_at(index);
194 assert(object_resolved_method->name() == resolved_method->name(),
195 "Object and interface method names should match at vtable index %d, %s != %s",
196 index, object_resolved_method->name()->as_C_string(), resolved_method->name()->as_C_string());
197 assert(object_resolved_method->signature() == resolved_method->signature(),
198 "Object and interface method signatures should match at vtable index %d, %s != %s",
199 index, object_resolved_method->signature()->as_C_string(), resolved_method->signature()->as_C_string());
200 #endif // ASSERT
201
202 kind = CallInfo::vtable_call;
203 } else {
204 // A regular interface call.
205 kind = CallInfo::itable_call;
206 index = resolved_method->itable_index();
207 }
208 assert(index == Method::nonvirtual_vtable_index || index >= 0, "bad index %d", index);
209 _call_kind = kind;
210 _call_index = index;
211 _resolved_appendix = Handle();
212 DEBUG_ONLY(verify());
213 }
214
215 #ifdef ASSERT
216 void CallInfo::verify() {
217 switch (call_kind()) { // the meaning and allowed value of index depends on kind
218 case CallInfo::direct_call:
219 if (_call_index == Method::nonvirtual_vtable_index) break;
220 // else fall through to check vtable index:
221 case CallInfo::vtable_call:
222 assert(resolved_klass()->verify_vtable_index(_call_index), "");
223 break;
224 case CallInfo::itable_call:
225 assert(resolved_method()->method_holder()->verify_itable_index(_call_index), "");
226 break;
227 case CallInfo::unknown_kind:
228 assert(call_kind() != CallInfo::unknown_kind, "CallInfo must be set");
229 break;
230 default:
231 fatal("Unexpected call kind %d", call_kind());
232 }
233 }
234 #endif //ASSERT
235
236 #ifndef PRODUCT
237 void CallInfo::print() {
238 ResourceMark rm;
239 const char* kindstr = "unknown";
240 switch (_call_kind) {
241 case direct_call: kindstr = "direct"; break;
242 case vtable_call: kindstr = "vtable"; break;
243 case itable_call: kindstr = "itable"; break;
244 }
245 tty->print_cr("Call %s@%d %s", kindstr, _call_index,
246 _resolved_method.is_null() ? "(none)" : _resolved_method->name_and_sig_as_C_string());
247 }
248 #endif
249
250 //------------------------------------------------------------------------------------------------------------------------
251 // Implementation of LinkInfo
252
253 LinkInfo::LinkInfo(const constantPoolHandle& pool, int index, TRAPS) {
254 // resolve klass
255 Klass* result = pool->klass_ref_at(index, CHECK);
256 _resolved_klass = KlassHandle(THREAD, result);
257
258 // Get name, signature, and static klass
259 _name = pool->name_ref_at(index);
260 _signature = pool->signature_ref_at(index);
261 _current_klass = KlassHandle(THREAD, pool->pool_holder());
262
263 // Coming from the constant pool always checks access
264 _check_access = true;
265 }
266
267 char* LinkInfo::method_string() const {
268 return Method::name_and_sig_as_C_string(_resolved_klass(), _name, _signature);
269 }
270
271 #ifndef PRODUCT
272 void LinkInfo::print() {
273 ResourceMark rm;
274 tty->print_cr("Link resolved_klass=%s name=%s signature=%s current_klass=%s check_access=%s",
275 _resolved_klass->name()->as_C_string(),
276 _name->as_C_string(),
277 _signature->as_C_string(),
278 _current_klass.is_null() ? "(none)" : _current_klass->name()->as_C_string(),
279 _check_access ? "true" : "false");
280 }
281 #endif // PRODUCT
282 //------------------------------------------------------------------------------------------------------------------------
283 // Klass resolution
284
285 void LinkResolver::check_klass_accessability(KlassHandle ref_klass, KlassHandle sel_klass, TRAPS) {
286 if (!Reflection::verify_class_access(ref_klass(),
287 sel_klass(),
288 true)) {
289 ResourceMark rm(THREAD);
290 Exceptions::fthrow(
291 THREAD_AND_LOCATION,
292 vmSymbols::java_lang_IllegalAccessError(),
293 "tried to access class %s from class %s",
294 sel_klass->external_name(),
295 ref_klass->external_name()
296 );
297 return;
298 }
299 }
300
301 //------------------------------------------------------------------------------------------------------------------------
302 // Method resolution
303 //
304 // According to JVM spec. $5.4.3c & $5.4.3d
305
306 // Look up method in klasses, including static methods
307 // Then look up local default methods
308 methodHandle LinkResolver::lookup_method_in_klasses(const LinkInfo& link_info,
309 bool checkpolymorphism,
310 bool in_imethod_resolve, TRAPS) {
311 KlassHandle klass = link_info.resolved_klass();
312 Symbol* name = link_info.name();
313 Symbol* signature = link_info.signature();
314
315 // Ignore overpasses so statics can be found during resolution
316 Method* result = klass->uncached_lookup_method(name, signature, Klass::skip_overpass);
317
318 if (klass->is_array_klass()) {
319 return methodHandle(THREAD, result);
320 }
321
322 InstanceKlass* ik = InstanceKlass::cast(klass());
323
324 // JDK 8, JVMS 5.4.3.4: Interface method resolution should
325 // ignore static and non-public methods of java.lang.Object,
326 // like clone, finalize, registerNatives.
327 if (in_imethod_resolve &&
328 result != NULL &&
329 ik->is_interface() &&
330 (result->is_static() || !result->is_public()) &&
331 result->method_holder() == SystemDictionary::Object_klass()) {
332 result = NULL;
333 }
334
335 // Before considering default methods, check for an overpass in the
336 // current class if a method has not been found.
337 if (result == NULL) {
338 result = ik->find_method(name, signature);
339 }
340
341 if (result == NULL) {
342 Array<Method*>* default_methods = ik->default_methods();
343 if (default_methods != NULL) {
344 result = InstanceKlass::find_method(default_methods, name, signature);
345 }
346 }
347
348 if (checkpolymorphism && result != NULL) {
349 vmIntrinsics::ID iid = result->intrinsic_id();
350 if (MethodHandles::is_signature_polymorphic(iid)) {
351 // Do not link directly to these. The VM must produce a synthetic one using lookup_polymorphic_method.
352 return NULL;
353 }
354 }
355 return methodHandle(THREAD, result);
356 }
357
358 // returns first instance method
359 // Looks up method in classes, then looks up local default methods
360 methodHandle LinkResolver::lookup_instance_method_in_klasses(KlassHandle klass,
361 Symbol* name,
362 Symbol* signature, TRAPS) {
363 Method* result = klass->uncached_lookup_method(name, signature, Klass::find_overpass);
364
365 while (result != NULL && result->is_static() && result->method_holder()->super() != NULL) {
366 Klass* super_klass = result->method_holder()->super();
367 result = super_klass->uncached_lookup_method(name, signature, Klass::find_overpass);
368 }
369
370 if (result == NULL) {
371 if (klass->is_instance_klass()) {
372 Array<Method*>* default_methods = InstanceKlass::cast(klass())->default_methods();
373 if (default_methods != NULL) {
374 result = InstanceKlass::find_method(default_methods, name, signature);
375 assert(result == NULL || !result->is_static(), "static defaults not allowed");
376 }
377 }
378 else if (klass->extra_super() != NULL){
379 assert(klass->is_array_klass(), "must be array here");
380 result = klass->extra_super()->uncached_lookup_method(name, signature, Klass::find_overpass);
381 }
382 }
383
384 return methodHandle(THREAD, result);
385 }
386
387 int LinkResolver::vtable_index_of_interface_method(KlassHandle klass,
388 const methodHandle& resolved_method) {
389
390 int vtable_index = Method::invalid_vtable_index;
391 Symbol* name = resolved_method->name();
392 Symbol* signature = resolved_method->signature();
393 InstanceKlass* ik = InstanceKlass::cast(klass());
394
395 // First check in default method array
396 if (!resolved_method->is_abstract() && ik->default_methods() != NULL) {
397 int index = InstanceKlass::find_method_index(ik->default_methods(),
398 name, signature, Klass::find_overpass,
399 Klass::find_static, Klass::find_private);
400 if (index >= 0 ) {
401 vtable_index = ik->default_vtable_indices()->at(index);
402 }
403 }
404 if (vtable_index == Method::invalid_vtable_index) {
405 // get vtable_index for miranda methods
406 ResourceMark rm;
407 klassVtable *vt = ik->vtable();
408 vtable_index = vt->index_of_miranda(name, signature);
409 }
410 return vtable_index;
411 }
412
413 methodHandle LinkResolver::lookup_method_in_interfaces(const LinkInfo& cp_info, TRAPS) {
414 InstanceKlass *ik = InstanceKlass::cast(cp_info.resolved_klass()());
415
416 // Specify 'true' in order to skip default methods when searching the
417 // interfaces. Function lookup_method_in_klasses() already looked for
418 // the method in the default methods table.
419 return methodHandle(THREAD,
420 ik->lookup_method_in_all_interfaces(cp_info.name(), cp_info.signature(),
421 Klass::skip_defaults));
422 }
423
424 methodHandle LinkResolver::lookup_polymorphic_method(
425 const LinkInfo& link_info,
426 Handle *appendix_result_or_null,
427 Handle *method_type_result,
428 TRAPS) {
429 KlassHandle klass = link_info.resolved_klass();
430 Symbol* name = link_info.name();
431 Symbol* full_signature = link_info.signature();
432
433 vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name);
434 if (TraceMethodHandles) {
435 ResourceMark rm(THREAD);
436 tty->print_cr("lookup_polymorphic_method iid=%s %s.%s%s",
437 vmIntrinsics::name_at(iid), klass->external_name(),
438 name->as_C_string(), full_signature->as_C_string());
439 }
440 if ((klass() == SystemDictionary::MethodHandle_klass() ||
441 klass() == SystemDictionary::VarHandle_klass() ||
442 klass() == SystemDictionary::FieldHandle_klass() ||
443 klass() == SystemDictionary::ArrayHandle_klass()) &&
444 iid != vmIntrinsics::_none) {
445 if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) {
446 // Most of these do not need an up-call to Java to resolve, so can be done anywhere.
447 // Do not erase last argument type (MemberName) if it is a static linkTo method.
448 bool keep_last_arg = MethodHandles::is_signature_polymorphic_static(iid);
449 TempNewSymbol basic_signature =
450 MethodHandles::lookup_basic_type_signature(full_signature, keep_last_arg, CHECK_NULL);
451 if (TraceMethodHandles) {
452 ResourceMark rm(THREAD);
453 tty->print_cr("lookup_polymorphic_method %s %s => basic %s",
454 name->as_C_string(),
455 full_signature->as_C_string(),
456 basic_signature->as_C_string());
457 }
458 methodHandle result = SystemDictionary::find_method_handle_intrinsic(iid,
459 basic_signature,
460 CHECK_NULL);
461 if (result.not_null()) {
462 assert(result->is_method_handle_intrinsic(), "MH.invokeBasic or MH.linkTo* intrinsic");
463 assert(result->intrinsic_id() != vmIntrinsics::_invokeGeneric, "wrong place to find this");
464 assert(basic_signature == result->signature(), "predict the result signature");
465 if (TraceMethodHandles) {
466 ttyLocker ttyl;
467 tty->print("lookup_polymorphic_method => intrinsic ");
468 result->print_on(tty);
469 }
470 }
471 return result;
472 } else if (iid == vmIntrinsics::_invokeGeneric
473 && THREAD->can_call_java()
474 && appendix_result_or_null != NULL) {
475 // This is a method with type-checking semantics.
476 // We will ask Java code to spin an adapter method for it.
477 if (!MethodHandles::enabled()) {
478 // Make sure the Java part of the runtime has been booted up.
479 Klass* natives = SystemDictionary::MethodHandleNatives_klass();
480 if (natives == NULL || InstanceKlass::cast(natives)->is_not_initialized()) {
481 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_invoke_MethodHandleNatives(),
482 Handle(),
483 Handle(),
484 true,
485 CHECK_NULL);
486 }
487 }
488
489 Handle appendix;
490 Handle method_type;
491 methodHandle result = SystemDictionary::find_method_handle_invoker(
492 name,
493 full_signature,
494 link_info.current_klass(),
495 &appendix,
496 &method_type,
497 CHECK_NULL);
498 if (TraceMethodHandles) {
499 ttyLocker ttyl;
500 tty->print("lookup_polymorphic_method => (via Java) ");
501 result->print_on(tty);
502 tty->print(" lookup_polymorphic_method => appendix = ");
503 if (appendix.is_null()) tty->print_cr("(none)");
504 else appendix->print_on(tty);
505 }
506 if (result.not_null()) {
507 #ifdef ASSERT
508 ResourceMark rm(THREAD);
509
510 TempNewSymbol basic_signature =
511 MethodHandles::lookup_basic_type_signature(full_signature, CHECK_NULL);
512 int actual_size_of_params = result->size_of_parameters();
513 int expected_size_of_params = ArgumentSizeComputer(basic_signature).size();
514 // +1 for MethodHandle.this, +1 for trailing MethodType
515 if (!MethodHandles::is_signature_polymorphic_static(iid)) expected_size_of_params += 1;
516 if (appendix.not_null()) expected_size_of_params += 1;
517 if (actual_size_of_params != expected_size_of_params) {
518 tty->print_cr("*** basic_signature=%s", basic_signature->as_C_string());
519 tty->print_cr("*** result for %s: ", vmIntrinsics::name_at(iid));
520 result->print();
521 }
522 assert(actual_size_of_params == expected_size_of_params,
523 "%d != %d", actual_size_of_params, expected_size_of_params);
524 #endif //ASSERT
525
526 assert(appendix_result_or_null != NULL, "");
527 (*appendix_result_or_null) = appendix;
528 (*method_type_result) = method_type;
529 }
530 return result;
531 }
532 }
533 return NULL;
534 }
535
536 void LinkResolver::check_method_accessability(KlassHandle ref_klass,
537 KlassHandle resolved_klass,
538 KlassHandle sel_klass,
539 const methodHandle& sel_method,
540 TRAPS) {
541
542 AccessFlags flags = sel_method->access_flags();
543
544 // Special case: arrays always override "clone". JVMS 2.15.
545 // If the resolved klass is an array class, and the declaring class
546 // is java.lang.Object and the method is "clone", set the flags
547 // to public.
548 //
549 // We'll check for the method name first, as that's most likely
550 // to be false (so we'll short-circuit out of these tests).
551 if (sel_method->name() == vmSymbols::clone_name() &&
552 sel_klass() == SystemDictionary::Object_klass() &&
553 resolved_klass->is_array_klass()) {
554 // We need to change "protected" to "public".
555 assert(flags.is_protected(), "clone not protected?");
556 jint new_flags = flags.as_int();
557 new_flags = new_flags & (~JVM_ACC_PROTECTED);
558 new_flags = new_flags | JVM_ACC_PUBLIC;
559 flags.set_flags(new_flags);
560 }
561 // assert(extra_arg_result_or_null != NULL, "must be able to return extra argument");
562
563 if (!Reflection::verify_field_access(ref_klass(),
564 resolved_klass(),
565 sel_klass(),
566 flags,
567 true)) {
568 ResourceMark rm(THREAD);
569 Exceptions::fthrow(
570 THREAD_AND_LOCATION,
571 vmSymbols::java_lang_IllegalAccessError(),
572 "tried to access method %s.%s%s from class %s",
573 sel_klass->external_name(),
574 sel_method->name()->as_C_string(),
575 sel_method->signature()->as_C_string(),
576 ref_klass->external_name()
577 );
578 return;
579 }
580 }
581
582 methodHandle LinkResolver::resolve_method_statically(Bytecodes::Code code,
583 const constantPoolHandle& pool, int index, TRAPS) {
584 // This method is used only
585 // (1) in C2 from InlineTree::ok_to_inline (via ciMethod::check_call),
586 // and
587 // (2) in Bytecode_invoke::static_target
588 // It appears to fail when applied to an invokeinterface call site.
589 // FIXME: Remove this method and ciMethod::check_call; refactor to use the other LinkResolver entry points.
590 // resolve klass
591 KlassHandle resolved_klass;
592 if (code == Bytecodes::_invokedynamic) {
593 resolved_klass = SystemDictionary::MethodHandle_klass();
594 Symbol* method_name = vmSymbols::invoke_name();
595 Symbol* method_signature = pool->signature_ref_at(index);
596 KlassHandle current_klass(THREAD, pool->pool_holder());
597 LinkInfo link_info(resolved_klass, method_name, method_signature, current_klass);
598 return resolve_method(link_info, /*require_methodref*/false, THREAD);
599 }
600
601 LinkInfo link_info(pool, index, CHECK_NULL);
602 resolved_klass = link_info.resolved_klass();
603
604 if (pool->has_preresolution()
605 || (resolved_klass() == SystemDictionary::MethodHandle_klass() &&
606 MethodHandles::is_signature_polymorphic_name(resolved_klass(), link_info.name()))) {
607 Method* result = ConstantPool::method_at_if_loaded(pool, index);
608 if (result != NULL) {
609 return methodHandle(THREAD, result);
610 }
611 }
612
613 if (code == Bytecodes::_invokeinterface) {
614 return resolve_interface_method(link_info, true, THREAD);
615 } else if (code == Bytecodes::_invokevirtual) {
616 return resolve_method(link_info, /*require_methodref*/true, THREAD);
617 } else if (!resolved_klass->is_interface()) {
618 return resolve_method(link_info, /*require_methodref*/false, THREAD);
619 } else {
620 bool nostatics = (code == Bytecodes::_invokestatic) ? false : true;
621 return resolve_interface_method(link_info, nostatics, THREAD);
622 }
623 }
624
625 // Check and print a loader constraint violation message for method or interface method
626 void LinkResolver::check_method_loader_constraints(const LinkInfo& link_info,
627 const methodHandle& resolved_method,
628 const char* method_type, TRAPS) {
629 Handle current_loader(THREAD, link_info.current_klass()->class_loader());
630 Handle resolved_loader(THREAD, resolved_method->method_holder()->class_loader());
631
632 ResourceMark rm(THREAD);
633 Symbol* failed_type_symbol =
634 SystemDictionary::check_signature_loaders(link_info.signature(), current_loader,
635 resolved_loader, true, CHECK);
636 if (failed_type_symbol != NULL) {
637 const char* msg = "loader constraint violation: when resolving %s"
638 " \"%s\" the class loader (instance of %s) of the current class, %s,"
639 " and the class loader (instance of %s) for the method's defining class, %s, have"
640 " different Class objects for the type %s used in the signature";
641 char* sig = link_info.method_string();
642 const char* loader1_name = SystemDictionary::loader_name(current_loader());
643 char* current = link_info.current_klass()->name()->as_C_string();
644 const char* loader2_name = SystemDictionary::loader_name(resolved_loader());
645 char* target = resolved_method->method_holder()->name()->as_C_string();
646 char* failed_type_name = failed_type_symbol->as_C_string();
647 size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1_name) +
648 strlen(current) + strlen(loader2_name) + strlen(target) +
649 strlen(failed_type_name) + strlen(method_type) + 1;
650 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen);
651 jio_snprintf(buf, buflen, msg, method_type, sig, loader1_name, current, loader2_name,
652 target, failed_type_name);
653 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf);
654 }
655 }
656
657 void LinkResolver::check_field_loader_constraints(Symbol* field, Symbol* sig,
658 KlassHandle current_klass,
659 KlassHandle sel_klass, TRAPS) {
660 Handle ref_loader(THREAD, current_klass->class_loader());
661 Handle sel_loader(THREAD, sel_klass->class_loader());
662
663 ResourceMark rm(THREAD); // needed for check_signature_loaders
664 Symbol* failed_type_symbol =
665 SystemDictionary::check_signature_loaders(sig,
666 ref_loader, sel_loader,
667 false,
668 CHECK);
669 if (failed_type_symbol != NULL) {
670 const char* msg = "loader constraint violation: when resolving field"
671 " \"%s\" the class loader (instance of %s) of the referring class, "
672 "%s, and the class loader (instance of %s) for the field's resolved "
673 "type, %s, have different Class objects for that type";
674 char* field_name = field->as_C_string();
675 const char* loader1_name = SystemDictionary::loader_name(ref_loader());
676 char* sel = sel_klass->name()->as_C_string();
677 const char* loader2_name = SystemDictionary::loader_name(sel_loader());
678 char* failed_type_name = failed_type_symbol->as_C_string();
679 size_t buflen = strlen(msg) + strlen(field_name) + strlen(loader1_name) +
680 strlen(sel) + strlen(loader2_name) + strlen(failed_type_name) + 1;
681 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen);
682 jio_snprintf(buf, buflen, msg, field_name, loader1_name, sel, loader2_name,
683 failed_type_name);
684 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf);
685 }
686 }
687
688 methodHandle LinkResolver::resolve_method(const LinkInfo& link_info,
689 bool require_methodref, TRAPS) {
690
691 Handle nested_exception;
692 KlassHandle resolved_klass = link_info.resolved_klass();
693
694 // 1. check if methodref required, that resolved_klass is not interfacemethodref
695 if (require_methodref && resolved_klass->is_interface()) {
696 ResourceMark rm(THREAD);
697 char buf[200];
698 jio_snprintf(buf, sizeof(buf), "Found interface %s, but class was expected",
699 resolved_klass()->external_name());
700 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
701 }
702
703 // 2. lookup method in resolved klass and its super klasses
704 methodHandle resolved_method = lookup_method_in_klasses(link_info, true, false, CHECK_NULL);
705
706 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) { // not found in the class hierarchy
707 // 3. lookup method in all the interfaces implemented by the resolved klass
708 resolved_method = lookup_method_in_interfaces(link_info, CHECK_NULL);
709
710 if (resolved_method.is_null()) {
711 // JSR 292: see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc
712 resolved_method = lookup_polymorphic_method(link_info, (Handle*)NULL, (Handle*)NULL, THREAD);
713 if (HAS_PENDING_EXCEPTION) {
714 nested_exception = Handle(THREAD, PENDING_EXCEPTION);
715 CLEAR_PENDING_EXCEPTION;
716 }
717 }
718 }
719
720 if (resolved_method.is_null()) {
721 // 4. method lookup failed
722 ResourceMark rm(THREAD);
723 THROW_MSG_CAUSE_(vmSymbols::java_lang_NoSuchMethodError(),
724 Method::name_and_sig_as_C_string(resolved_klass(),
725 link_info.name(),
726 link_info.signature()),
727 nested_exception, NULL);
728 }
729
730 // 5. access checks, access checking may be turned off when calling from within the VM.
731 KlassHandle current_klass = link_info.current_klass();
732 if (link_info.check_access()) {
733 assert(current_klass.not_null() , "current_klass should not be null");
734
735 // check if method can be accessed by the referring class
736 check_method_accessability(current_klass,
737 resolved_klass,
738 KlassHandle(THREAD, resolved_method->method_holder()),
739 resolved_method,
740 CHECK_NULL);
741
742 // check loader constraints
743 check_method_loader_constraints(link_info, resolved_method, "method", CHECK_NULL);
744 }
745
746 return resolved_method;
747 }
748
749 static void trace_method_resolution(const char* prefix,
750 KlassHandle klass,
751 KlassHandle resolved_klass,
752 const methodHandle& method,
753 bool logitables,
754 int index = -1) {
755 #ifndef PRODUCT
756 ResourceMark rm;
757 outputStream* st;
758 if (logitables) {
759 st = LogHandle(itables)::trace_stream();
760 } else {
761 st = LogHandle(vtables)::trace_stream();
762 }
763 st->print("%s%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ",
764 prefix,
765 (klass.is_null() ? "<NULL>" : klass->internal_name()),
766 (resolved_klass.is_null() ? "<NULL>" : resolved_klass->internal_name()),
767 Method::name_and_sig_as_C_string(resolved_klass(),
768 method->name(),
769 method->signature()),
770 method->method_holder()->internal_name());
771 method->print_linkage_flags(st);
772 if (index != -1) {
773 st->print("vtable_index:%d", index);
774 }
775 st->cr();
776 #endif // PRODUCT
777 }
778
779 methodHandle LinkResolver::resolve_interface_method(const LinkInfo& link_info,
780 bool nostatics, TRAPS) {
781
782 KlassHandle resolved_klass = link_info.resolved_klass();
783
784 // check if klass is interface
785 if (!resolved_klass->is_interface()) {
786 ResourceMark rm(THREAD);
787 char buf[200];
788 jio_snprintf(buf, sizeof(buf), "Found class %s, but interface was expected", resolved_klass()->external_name());
789 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
790 }
791
792 // lookup method in this interface or its super, java.lang.Object
793 // JDK8: also look for static methods
794 methodHandle resolved_method = lookup_method_in_klasses(link_info, false, true, CHECK_NULL);
795
796 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) {
797 // lookup method in all the super-interfaces
798 resolved_method = lookup_method_in_interfaces(link_info, CHECK_NULL);
799 }
800
801 if (resolved_method.is_null()) {
802 // no method found
803 ResourceMark rm(THREAD);
804 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(),
805 Method::name_and_sig_as_C_string(resolved_klass(),
806 link_info.name(),
807 link_info.signature()));
808 }
809
810 if (link_info.check_access()) {
811 // JDK8 adds non-public interface methods, and accessability check requirement
812 KlassHandle current_klass = link_info.current_klass();
813
814 assert(current_klass.not_null() , "current_klass should not be null");
815
816 // check if method can be accessed by the referring class
817 check_method_accessability(current_klass,
818 resolved_klass,
819 KlassHandle(THREAD, resolved_method->method_holder()),
820 resolved_method,
821 CHECK_NULL);
822
823 check_method_loader_constraints(link_info, resolved_method, "interface method", CHECK_NULL);
824 }
825
826 if (nostatics && resolved_method->is_static()) {
827 ResourceMark rm(THREAD);
828 char buf[200];
829 jio_snprintf(buf, sizeof(buf), "Expected instance not static method %s",
830 Method::name_and_sig_as_C_string(resolved_klass(),
831 resolved_method->name(), resolved_method->signature()));
832 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
833 }
834
835 if (log_develop_is_enabled(Trace, itables)) {
836 trace_method_resolution("invokeinterface resolved method: caller-class",
837 link_info.current_klass(), resolved_klass,
838 resolved_method, true);
839 }
840
841 return resolved_method;
842 }
843
844 //------------------------------------------------------------------------------------------------------------------------
845 // Field resolution
846
847 void LinkResolver::check_field_accessability(KlassHandle ref_klass,
848 KlassHandle resolved_klass,
849 KlassHandle sel_klass,
850 const fieldDescriptor& fd,
851 TRAPS) {
852 if (!Reflection::verify_field_access(ref_klass(),
853 resolved_klass(),
854 sel_klass(),
855 fd.access_flags(),
856 true)) {
857 ResourceMark rm(THREAD);
858 Exceptions::fthrow(
859 THREAD_AND_LOCATION,
860 vmSymbols::java_lang_IllegalAccessError(),
861 "tried to access field %s.%s from class %s",
862 sel_klass->external_name(),
863 fd.name()->as_C_string(),
864 ref_klass->external_name()
865 );
866 return;
867 }
868 }
869
870 void LinkResolver::resolve_field_access(fieldDescriptor& fd, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) {
871 LinkInfo link_info(pool, index, CHECK);
872 resolve_field(fd, link_info, byte, true, CHECK);
873 }
874
875 void LinkResolver::resolve_field(fieldDescriptor& fd,
876 const LinkInfo& link_info,
877 Bytecodes::Code byte, bool initialize_class,
878 TRAPS) {
879 assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic ||
880 byte == Bytecodes::_getfield || byte == Bytecodes::_putfield ||
881 byte == Bytecodes::_vgetfield ||
882 byte == Bytecodes::_nofast_getfield || byte == Bytecodes::_nofast_putfield ||
883 (byte == Bytecodes::_nop && !link_info.check_access()), "bad field access bytecode");
884
885 bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic);
886 bool is_put = (byte == Bytecodes::_putfield || byte == Bytecodes::_putstatic || byte == Bytecodes::_nofast_putfield);
887 // Check if there's a resolved klass containing the field
888 KlassHandle resolved_klass = link_info.resolved_klass();
889 Symbol* field = link_info.name();
890 Symbol* sig = link_info.signature();
891
892 if (resolved_klass.is_null()) {
893 ResourceMark rm(THREAD);
894 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
895 }
896
897 // Resolve instance field
898 KlassHandle sel_klass(THREAD, resolved_klass->find_field(field, sig, &fd));
899 // check if field exists; i.e., if a klass containing the field def has been selected
900 if (sel_klass.is_null()) {
901 ResourceMark rm(THREAD);
902 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
903 }
904
905 if (!link_info.check_access())
906 // Access checking may be turned off when calling from within the VM.
907 return;
908
909 // check access
910 KlassHandle current_klass = link_info.current_klass();
911 check_field_accessability(current_klass, resolved_klass, sel_klass, fd, CHECK);
912
913 // check for errors
914 if (is_static != fd.is_static()) {
915 ResourceMark rm(THREAD);
916 char msg[200];
917 jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", resolved_klass()->external_name(), fd.name()->as_C_string());
918 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg);
919 }
920
921 // Final fields can only be accessed from its own class.
922 if (is_put && fd.access_flags().is_final() && sel_klass() != current_klass()) {
923 THROW(vmSymbols::java_lang_IllegalAccessError());
924 }
925
926 // initialize resolved_klass if necessary
927 // note 1: the klass which declared the field must be initialized (i.e, sel_klass)
928 // according to the newest JVM spec (5.5, p.170) - was bug (gri 7/28/99)
929 //
930 // note 2: we don't want to force initialization if we are just checking
931 // if the field access is legal; e.g., during compilation
932 if (is_static && initialize_class) {
933 sel_klass->initialize(CHECK);
934 }
935
936 if (sel_klass() != current_klass()) {
937 check_field_loader_constraints(field, sig, current_klass, sel_klass, CHECK);
938 }
939
940 // return information. note that the klass is set to the actual klass containing the
941 // field, otherwise access of static fields in superclasses will not work.
942 }
943
944
945 //------------------------------------------------------------------------------------------------------------------------
946 // Invoke resolution
947 //
948 // Naming conventions:
949 //
950 // resolved_method the specified method (i.e., static receiver specified via constant pool index)
951 // sel_method the selected method (selected via run-time lookup; e.g., based on dynamic receiver class)
952 // resolved_klass the specified klass (i.e., specified via constant pool index)
953 // recv_klass the receiver klass
954
955
956 void LinkResolver::resolve_static_call(CallInfo& result,
957 const LinkInfo& link_info,
958 bool initialize_class, TRAPS) {
959 methodHandle resolved_method = linktime_resolve_static_method(link_info, CHECK);
960
961 // The resolved class can change as a result of this resolution.
962 KlassHandle resolved_klass = KlassHandle(THREAD, resolved_method->method_holder());
963
964 Method* save_resolved_method = resolved_method();
965 // Initialize klass (this should only happen if everything is ok)
966 if (initialize_class && resolved_klass->should_be_initialized()) {
967 resolved_klass->initialize(CHECK);
968 // Use updated LinkInfo (to reresolve with resolved_klass as method_holder?)
969 LinkInfo new_info(resolved_klass, link_info.name(), link_info.signature(),
970 link_info.current_klass(), link_info.check_access());
971 resolved_method = linktime_resolve_static_method(new_info, CHECK);
972 }
973
974 assert(save_resolved_method == resolved_method(), "does this change?");
975 // setup result
976 result.set_static(resolved_klass, resolved_method, CHECK);
977 }
978
979 // throws linktime exceptions
980 methodHandle LinkResolver::linktime_resolve_static_method(const LinkInfo& link_info, TRAPS) {
981
982 KlassHandle resolved_klass = link_info.resolved_klass();
983 methodHandle resolved_method;
984 if (!resolved_klass->is_interface()) {
985 resolved_method = resolve_method(link_info, /*require_methodref*/false, CHECK_NULL);
986 } else {
987 resolved_method = resolve_interface_method(link_info, /*nostatics*/false, CHECK_NULL);
988 }
989 assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier");
990
991 // check if static
992 if (!resolved_method->is_static()) {
993 ResourceMark rm(THREAD);
994 char buf[200];
995 jio_snprintf(buf, sizeof(buf), "Expected static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
996 resolved_method->name(),
997 resolved_method->signature()));
998 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
999 }
1000 return resolved_method;
1001 }
1002
1003
1004 void LinkResolver::resolve_special_call(CallInfo& result,
1005 const LinkInfo& link_info,
1006 TRAPS) {
1007 methodHandle resolved_method = linktime_resolve_special_method(link_info, CHECK);
1008 runtime_resolve_special_method(result, resolved_method,
1009 link_info.resolved_klass(),
1010 link_info.current_klass(),
1011 link_info.check_access(), CHECK);
1012 }
1013
1014 // throws linktime exceptions
1015 methodHandle LinkResolver::linktime_resolve_special_method(const LinkInfo& link_info,
1016 TRAPS) {
1017
1018 // Invokespecial is called for multiple special reasons:
1019 // <init>
1020 // local private method invocation, for classes and interfaces
1021 // superclass.method, which can also resolve to a default method
1022 // and the selected method is recalculated relative to the direct superclass
1023 // superinterface.method, which explicitly does not check shadowing
1024 KlassHandle resolved_klass = link_info.resolved_klass();
1025 methodHandle resolved_method;
1026
1027 if (!resolved_klass->is_interface()) {
1028 resolved_method = resolve_method(link_info, /*require_methodref*/false, CHECK_NULL);
1029 } else {
1030 resolved_method = resolve_interface_method(link_info, /*nostatics*/true, CHECK_NULL);
1031 }
1032
1033 // check if method name is <init>, that it is found in same klass as static type
1034 if (resolved_method->name() == vmSymbols::object_initializer_name() &&
1035 resolved_method->method_holder() != resolved_klass()) {
1036 ResourceMark rm(THREAD);
1037 Exceptions::fthrow(
1038 THREAD_AND_LOCATION,
1039 vmSymbols::java_lang_NoSuchMethodError(),
1040 "%s: method %s%s not found",
1041 resolved_klass->external_name(),
1042 resolved_method->name()->as_C_string(),
1043 resolved_method->signature()->as_C_string()
1044 );
1045 return NULL;
1046 }
1047
1048 // check if invokespecial's interface method reference is in an indirect superinterface
1049 KlassHandle current_klass = link_info.current_klass();
1050 if (!current_klass.is_null() && resolved_klass->is_interface()) {
1051 Klass *klass_to_check = !InstanceKlass::cast(current_klass())->is_anonymous() ?
1052 current_klass() :
1053 InstanceKlass::cast(current_klass())->host_klass();
1054 // Disable verification for the dynamically-generated reflection bytecodes.
1055 bool is_reflect = klass_to_check->is_subclass_of(
1056 SystemDictionary::reflect_MagicAccessorImpl_klass());
1057
1058 if (!is_reflect &&
1059 !InstanceKlass::cast(klass_to_check)->is_same_or_direct_interface(resolved_klass())) {
1060 ResourceMark rm(THREAD);
1061 char buf[200];
1062 jio_snprintf(buf, sizeof(buf),
1063 "Interface method reference: %s, is in an indirect superinterface of %s",
1064 Method::name_and_sig_as_C_string(resolved_klass(),
1065 resolved_method->name(),
1066 resolved_method->signature()),
1067 current_klass->external_name());
1068 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1069 }
1070 }
1071
1072 // check if not static
1073 if (resolved_method->is_static()) {
1074 ResourceMark rm(THREAD);
1075 char buf[200];
1076 jio_snprintf(buf, sizeof(buf),
1077 "Expecting non-static method %s",
1078 Method::name_and_sig_as_C_string(resolved_klass(),
1079 resolved_method->name(),
1080 resolved_method->signature()));
1081 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1082 }
1083
1084 if (log_develop_is_enabled(Trace, itables)) {
1085 trace_method_resolution("invokespecial resolved method: caller-class:",
1086 current_klass, resolved_klass, resolved_method, true);
1087 }
1088
1089 return resolved_method;
1090 }
1091
1092 // throws runtime exceptions
1093 void LinkResolver::runtime_resolve_special_method(CallInfo& result,
1094 const methodHandle& resolved_method,
1095 KlassHandle resolved_klass,
1096 KlassHandle current_klass,
1097 bool check_access, TRAPS) {
1098
1099 // resolved method is selected method unless we have an old-style lookup
1100 // for a superclass method
1101 // Invokespecial for a superinterface, resolved method is selected method,
1102 // no checks for shadowing
1103 methodHandle sel_method(THREAD, resolved_method());
1104
1105 // check if this is an old-style super call and do a new lookup if so
1106 { KlassHandle method_klass = KlassHandle(THREAD,
1107 resolved_method->method_holder());
1108
1109 if (check_access &&
1110 // a) check if ACC_SUPER flag is set for the current class
1111 (current_klass->is_super() || !AllowNonVirtualCalls) &&
1112 // b) check if the class of the resolved_klass is a superclass
1113 // (not supertype in order to exclude interface classes) of the current class.
1114 // This check is not performed for super.invoke for interface methods
1115 // in super interfaces.
1116 current_klass->is_subclass_of(resolved_klass()) &&
1117 current_klass() != resolved_klass() &&
1118 // c) check if the method is not <init>
1119 resolved_method->name() != vmSymbols::object_initializer_name()) {
1120 // Lookup super method
1121 KlassHandle super_klass(THREAD, current_klass->super());
1122 sel_method = lookup_instance_method_in_klasses(super_klass,
1123 resolved_method->name(),
1124 resolved_method->signature(), CHECK);
1125 // check if found
1126 if (sel_method.is_null()) {
1127 ResourceMark rm(THREAD);
1128 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1129 Method::name_and_sig_as_C_string(resolved_klass(),
1130 resolved_method->name(),
1131 resolved_method->signature()));
1132 }
1133 }
1134 }
1135
1136 // check if not static
1137 if (sel_method->is_static()) {
1138 ResourceMark rm(THREAD);
1139 char buf[200];
1140 jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
1141 resolved_method->name(),
1142 resolved_method->signature()));
1143 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1144 }
1145
1146 // check if abstract
1147 if (sel_method->is_abstract()) {
1148 ResourceMark rm(THREAD);
1149 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1150 Method::name_and_sig_as_C_string(resolved_klass(),
1151 sel_method->name(),
1152 sel_method->signature()));
1153 }
1154
1155 if (log_develop_is_enabled(Trace, itables)) {
1156 trace_method_resolution("invokespecial selected method: resolved-class:",
1157 resolved_klass, resolved_klass, sel_method, true);
1158 }
1159
1160 // setup result
1161 result.set_static(resolved_klass, sel_method, CHECK);
1162 }
1163
1164 void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, KlassHandle receiver_klass,
1165 const LinkInfo& link_info,
1166 bool check_null_and_abstract, TRAPS) {
1167 methodHandle resolved_method = linktime_resolve_virtual_method(link_info, CHECK);
1168 runtime_resolve_virtual_method(result, resolved_method,
1169 link_info.resolved_klass(),
1170 recv, receiver_klass,
1171 check_null_and_abstract, CHECK);
1172 }
1173
1174 // throws linktime exceptions
1175 methodHandle LinkResolver::linktime_resolve_virtual_method(const LinkInfo& link_info,
1176 TRAPS) {
1177 // normal method resolution
1178 methodHandle resolved_method = resolve_method(link_info, /*require_methodref*/true, CHECK_NULL);
1179
1180 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1181 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1182
1183 // check if private interface method
1184 KlassHandle resolved_klass = link_info.resolved_klass();
1185 KlassHandle current_klass = link_info.current_klass();
1186
1187 if (resolved_klass->is_interface() && resolved_method->is_private()) {
1188 ResourceMark rm(THREAD);
1189 char buf[200];
1190 jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokevirtual: method %s, caller-class:%s",
1191 Method::name_and_sig_as_C_string(resolved_klass(),
1192 resolved_method->name(),
1193 resolved_method->signature()),
1194 (current_klass.is_null() ? "<NULL>" : current_klass->internal_name()));
1195 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1196 }
1197
1198 // check if not static
1199 if (resolved_method->is_static()) {
1200 ResourceMark rm(THREAD);
1201 char buf[200];
1202 jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
1203 resolved_method->name(),
1204 resolved_method->signature()));
1205 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1206 }
1207
1208 if (log_develop_is_enabled(Trace, vtables)) {
1209 trace_method_resolution("invokevirtual resolved method: caller-class:",
1210 current_klass, resolved_klass, resolved_method, false);
1211 }
1212
1213 return resolved_method;
1214 }
1215
1216 // throws runtime exceptions
1217 void LinkResolver::runtime_resolve_virtual_method(CallInfo& result,
1218 const methodHandle& resolved_method,
1219 KlassHandle resolved_klass,
1220 Handle recv,
1221 KlassHandle recv_klass,
1222 bool check_null_and_abstract,
1223 TRAPS) {
1224
1225 // setup default return values
1226 int vtable_index = Method::invalid_vtable_index;
1227 methodHandle selected_method;
1228
1229 assert(recv.is_null() || recv->is_oop(), "receiver is not an oop");
1230
1231 // runtime method resolution
1232 if (check_null_and_abstract && recv.is_null()) { // check if receiver exists
1233 THROW(vmSymbols::java_lang_NullPointerException());
1234 }
1235
1236 // Virtual methods cannot be resolved before its klass has been linked, for otherwise the Method*'s
1237 // has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since
1238 // a missing receiver might result in a bogus lookup.
1239 assert(resolved_method->method_holder()->is_linked(), "must be linked");
1240
1241 // do lookup based on receiver klass using the vtable index
1242 if (resolved_method->method_holder()->is_interface()) { // default or miranda method
1243 vtable_index = vtable_index_of_interface_method(resolved_klass,
1244 resolved_method);
1245 assert(vtable_index >= 0 , "we should have valid vtable index at this point");
1246
1247 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1248 } else {
1249 // at this point we are sure that resolved_method is virtual and not
1250 // a default or miranda method; therefore, it must have a valid vtable index.
1251 assert(!resolved_method->has_itable_index(), "");
1252 vtable_index = resolved_method->vtable_index();
1253 // We could get a negative vtable_index for final methods,
1254 // because as an optimization they are they are never put in the vtable,
1255 // unless they override an existing method.
1256 // If we do get a negative, it means the resolved method is the the selected
1257 // method, and it can never be changed by an override.
1258 if (vtable_index == Method::nonvirtual_vtable_index) {
1259 assert(resolved_method->can_be_statically_bound(), "cannot override this method");
1260 selected_method = resolved_method;
1261 } else {
1262 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1263 }
1264 }
1265
1266 // check if method exists
1267 if (selected_method.is_null()) {
1268 ResourceMark rm(THREAD);
1269 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1270 Method::name_and_sig_as_C_string(resolved_klass(),
1271 resolved_method->name(),
1272 resolved_method->signature()));
1273 }
1274
1275 // check if abstract
1276 if (check_null_and_abstract && selected_method->is_abstract()) {
1277 ResourceMark rm(THREAD);
1278 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1279 Method::name_and_sig_as_C_string(resolved_klass(),
1280 selected_method->name(),
1281 selected_method->signature()));
1282 }
1283
1284 if (log_develop_is_enabled(Trace, vtables)) {
1285 trace_method_resolution("invokevirtual selected method: receiver-class:",
1286 recv_klass, resolved_klass, selected_method,
1287 false, vtable_index);
1288 }
1289 // setup result
1290 result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK);
1291 }
1292
1293 void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, KlassHandle recv_klass,
1294 const LinkInfo& link_info,
1295 bool check_null_and_abstract, TRAPS) {
1296 // throws linktime exceptions
1297 methodHandle resolved_method = linktime_resolve_interface_method(link_info, CHECK);
1298 runtime_resolve_interface_method(result, resolved_method,link_info.resolved_klass(),
1299 recv, recv_klass, check_null_and_abstract, CHECK);
1300 }
1301
1302 methodHandle LinkResolver::linktime_resolve_interface_method(const LinkInfo& link_info,
1303 TRAPS) {
1304 // normal interface method resolution
1305 methodHandle resolved_method = resolve_interface_method(link_info, true, CHECK_NULL);
1306 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1307 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1308
1309 return resolved_method;
1310 }
1311
1312 // throws runtime exceptions
1313 void LinkResolver::runtime_resolve_interface_method(CallInfo& result,
1314 const methodHandle& resolved_method,
1315 KlassHandle resolved_klass,
1316 Handle recv,
1317 KlassHandle recv_klass,
1318 bool check_null_and_abstract, TRAPS) {
1319 // check if receiver exists
1320 if (check_null_and_abstract && recv.is_null()) {
1321 THROW(vmSymbols::java_lang_NullPointerException());
1322 }
1323
1324 // check if private interface method
1325 if (resolved_klass->is_interface() && resolved_method->is_private()) {
1326 ResourceMark rm(THREAD);
1327 char buf[200];
1328 jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokeinterface: method %s",
1329 Method::name_and_sig_as_C_string(resolved_klass(),
1330 resolved_method->name(),
1331 resolved_method->signature()));
1332 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1333 }
1334
1335 // check if receiver klass implements the resolved interface
1336 if (!recv_klass->is_subtype_of(resolved_klass())) {
1337 ResourceMark rm(THREAD);
1338 char buf[200];
1339 jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s",
1340 recv_klass()->external_name(),
1341 resolved_klass()->external_name());
1342 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1343 }
1344
1345 // do lookup based on receiver klass
1346 // This search must match the linktime preparation search for itable initialization
1347 // to correctly enforce loader constraints for interface method inheritance
1348 methodHandle sel_method = lookup_instance_method_in_klasses(recv_klass,
1349 resolved_method->name(),
1350 resolved_method->signature(), CHECK);
1351 if (sel_method.is_null() && !check_null_and_abstract) {
1352 // In theory this is a harmless placeholder value, but
1353 // in practice leaving in null affects the nsk default method tests.
1354 // This needs further study.
1355 sel_method = resolved_method;
1356 }
1357 // check if method exists
1358 if (sel_method.is_null()) {
1359 ResourceMark rm(THREAD);
1360 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1361 Method::name_and_sig_as_C_string(recv_klass(),
1362 resolved_method->name(),
1363 resolved_method->signature()));
1364 }
1365 // check access
1366 // Throw Illegal Access Error if sel_method is not public.
1367 if (!sel_method->is_public()) {
1368 ResourceMark rm(THREAD);
1369 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(),
1370 Method::name_and_sig_as_C_string(recv_klass(),
1371 sel_method->name(),
1372 sel_method->signature()));
1373 }
1374 // check if abstract
1375 if (check_null_and_abstract && sel_method->is_abstract()) {
1376 ResourceMark rm(THREAD);
1377 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1378 Method::name_and_sig_as_C_string(recv_klass(),
1379 sel_method->name(),
1380 sel_method->signature()));
1381 }
1382
1383 if (log_develop_is_enabled(Trace, itables)) {
1384 trace_method_resolution("invokeinterface selected method: receiver-class",
1385 recv_klass, resolved_klass, sel_method, true);
1386 }
1387 // setup result
1388 if (!resolved_method->has_itable_index()) {
1389 int vtable_index = resolved_method->vtable_index();
1390 assert(vtable_index == sel_method->vtable_index(), "sanity check");
1391 result.set_virtual(resolved_klass, recv_klass, resolved_method, sel_method, vtable_index, CHECK);
1392 } else {
1393 int itable_index = resolved_method()->itable_index();
1394 result.set_interface(resolved_klass, recv_klass, resolved_method, sel_method, itable_index, CHECK);
1395 }
1396 }
1397
1398
1399 methodHandle LinkResolver::linktime_resolve_interface_method_or_null(
1400 const LinkInfo& link_info) {
1401 EXCEPTION_MARK;
1402 methodHandle method_result = linktime_resolve_interface_method(link_info, THREAD);
1403 if (HAS_PENDING_EXCEPTION) {
1404 CLEAR_PENDING_EXCEPTION;
1405 return methodHandle();
1406 } else {
1407 return method_result;
1408 }
1409 }
1410
1411 methodHandle LinkResolver::linktime_resolve_virtual_method_or_null(
1412 const LinkInfo& link_info) {
1413 EXCEPTION_MARK;
1414 methodHandle method_result = linktime_resolve_virtual_method(link_info, THREAD);
1415 if (HAS_PENDING_EXCEPTION) {
1416 CLEAR_PENDING_EXCEPTION;
1417 return methodHandle();
1418 } else {
1419 return method_result;
1420 }
1421 }
1422
1423 methodHandle LinkResolver::resolve_virtual_call_or_null(
1424 KlassHandle receiver_klass,
1425 const LinkInfo& link_info) {
1426 EXCEPTION_MARK;
1427 CallInfo info;
1428 resolve_virtual_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1429 if (HAS_PENDING_EXCEPTION) {
1430 CLEAR_PENDING_EXCEPTION;
1431 return methodHandle();
1432 }
1433 return info.selected_method();
1434 }
1435
1436 methodHandle LinkResolver::resolve_interface_call_or_null(
1437 KlassHandle receiver_klass,
1438 const LinkInfo& link_info) {
1439 EXCEPTION_MARK;
1440 CallInfo info;
1441 resolve_interface_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1442 if (HAS_PENDING_EXCEPTION) {
1443 CLEAR_PENDING_EXCEPTION;
1444 return methodHandle();
1445 }
1446 return info.selected_method();
1447 }
1448
1449 int LinkResolver::resolve_virtual_vtable_index(KlassHandle receiver_klass,
1450 const LinkInfo& link_info) {
1451 EXCEPTION_MARK;
1452 CallInfo info;
1453 resolve_virtual_call(info, Handle(), receiver_klass, link_info,
1454 /*check_null_or_abstract*/false, THREAD);
1455 if (HAS_PENDING_EXCEPTION) {
1456 CLEAR_PENDING_EXCEPTION;
1457 return Method::invalid_vtable_index;
1458 }
1459 return info.vtable_index();
1460 }
1461
1462 methodHandle LinkResolver::resolve_static_call_or_null(const LinkInfo& link_info) {
1463 EXCEPTION_MARK;
1464 CallInfo info;
1465 resolve_static_call(info, link_info, /*initialize_class*/false, THREAD);
1466 if (HAS_PENDING_EXCEPTION) {
1467 CLEAR_PENDING_EXCEPTION;
1468 return methodHandle();
1469 }
1470 return info.selected_method();
1471 }
1472
1473 methodHandle LinkResolver::resolve_special_call_or_null(const LinkInfo& link_info) {
1474 EXCEPTION_MARK;
1475 CallInfo info;
1476 resolve_special_call(info, link_info, THREAD);
1477 if (HAS_PENDING_EXCEPTION) {
1478 CLEAR_PENDING_EXCEPTION;
1479 return methodHandle();
1480 }
1481 return info.selected_method();
1482 }
1483
1484
1485
1486 //------------------------------------------------------------------------------------------------------------------------
1487 // ConstantPool entries
1488
1489 void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) {
1490 switch (byte) {
1491 case Bytecodes::_invokestatic : resolve_invokestatic (result, pool, index, CHECK); break;
1492 case Bytecodes::_invokespecial : resolve_invokespecial (result, pool, index, CHECK); break;
1493 case Bytecodes::_invokevirtual : resolve_invokevirtual (result, recv, pool, index, CHECK); break;
1494 case Bytecodes::_invokedirect : resolve_invokespecial (result, pool, index, CHECK); break; // temp hack
1495 case Bytecodes::_invokehandle : resolve_invokehandle (result, pool, index, CHECK); break;
1496 case Bytecodes::_invokedynamic : resolve_invokedynamic (result, pool, index, CHECK); break;
1497 case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break;
1498 }
1499 return;
1500 }
1501
1502 void LinkResolver::resolve_invoke(CallInfo& result, Handle& recv,
1503 const methodHandle& attached_method,
1504 Bytecodes::Code byte, TRAPS) {
1505 KlassHandle defc = attached_method->method_holder();
1506 Symbol* name = attached_method->name();
1507 Symbol* type = attached_method->signature();
1508 LinkInfo link_info(defc, name, type, KlassHandle(), /*check_access=*/false);
1509 switch(byte) {
1510 case Bytecodes::_invokevirtual:
1511 resolve_virtual_call(result, recv, recv->klass(), link_info,
1512 /*check_null_and_abstract=*/true, CHECK);
1513 break;
1514 case Bytecodes::_invokeinterface:
1515 resolve_interface_call(result, recv, recv->klass(), link_info,
1516 /*check_null_and_abstract=*/true, CHECK);
1517 break;
1518 case Bytecodes::_invokestatic:
1519 resolve_static_call(result, link_info, /*initialize_class=*/false, CHECK);
1520 break;
1521 case Bytecodes::_invokespecial:
1522 resolve_special_call(result, link_info, CHECK);
1523 break;
1524 default:
1525 fatal("bad call: %s", Bytecodes::name(byte));
1526 }
1527 }
1528
1529 void LinkResolver::resolve_invokestatic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1530 LinkInfo link_info(pool, index, CHECK);
1531 resolve_static_call(result, link_info, /*initialize_class*/true, CHECK);
1532 }
1533
1534
1535 void LinkResolver::resolve_invokespecial(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1536 LinkInfo link_info(pool, index, CHECK);
1537 resolve_special_call(result, link_info, CHECK);
1538 }
1539
1540
1541 void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv,
1542 const constantPoolHandle& pool, int index,
1543 TRAPS) {
1544
1545 LinkInfo link_info(pool, index, CHECK);
1546 KlassHandle recvrKlass (THREAD, recv.is_null() ? (Klass*)NULL : recv->klass());
1547 resolve_virtual_call(result, recv, recvrKlass, link_info, /*check_null_or_abstract*/true, CHECK);
1548 }
1549
1550
1551 void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, TRAPS) {
1552 LinkInfo link_info(pool, index, CHECK);
1553 KlassHandle recvrKlass (THREAD, recv.is_null() ? (Klass*)NULL : recv->klass());
1554 resolve_interface_call(result, recv, recvrKlass, link_info, true, CHECK);
1555 }
1556
1557
1558 void LinkResolver::resolve_invokehandle(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1559 // This guy is reached from InterpreterRuntime::resolve_invokehandle.
1560 LinkInfo link_info(pool, index, CHECK);
1561 if (TraceMethodHandles) {
1562 ResourceMark rm(THREAD);
1563 tty->print_cr("resolve_invokehandle %s %s", link_info.name()->as_C_string(),
1564 link_info.signature()->as_C_string());
1565 }
1566 resolve_handle_call(result, link_info, CHECK);
1567 }
1568
1569 void LinkResolver::resolve_handle_call(CallInfo& result,
1570 const LinkInfo& link_info,
1571 TRAPS) {
1572 // JSR 292: this must be an implicitly generated method MethodHandle.invokeExact(*...) or similar
1573 assert(link_info.resolved_klass()() == SystemDictionary::MethodHandle_klass() ||
1574 link_info.resolved_klass()() == SystemDictionary::VarHandle_klass() ||
1575 link_info.resolved_klass()() == SystemDictionary::FieldHandle_klass() ||
1576 link_info.resolved_klass()() == SystemDictionary::ArrayHandle_klass(), "");
1577 assert(MethodHandles::is_signature_polymorphic_name(link_info.name()), "");
1578 Handle resolved_appendix;
1579 Handle resolved_method_type;
1580 methodHandle resolved_method = lookup_polymorphic_method(link_info,
1581 &resolved_appendix, &resolved_method_type, CHECK);
1582 result.set_handle(resolved_method, resolved_appendix, resolved_method_type, CHECK);
1583 }
1584
1585 static void wrap_invokedynamic_exception(TRAPS) {
1586 if (HAS_PENDING_EXCEPTION) {
1587 if (TraceMethodHandles) {
1588 tty->print_cr("invokedynamic throws BSME for " INTPTR_FORMAT, p2i((void *)PENDING_EXCEPTION));
1589 PENDING_EXCEPTION->print();
1590 }
1591 if (PENDING_EXCEPTION->is_a(SystemDictionary::BootstrapMethodError_klass())) {
1592 // throw these guys, since they are already wrapped
1593 return;
1594 }
1595 if (!PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1596 // intercept only LinkageErrors which might have failed to wrap
1597 return;
1598 }
1599 // See the "Linking Exceptions" section for the invokedynamic instruction in the JVMS.
1600 Handle nested_exception(THREAD, PENDING_EXCEPTION);
1601 CLEAR_PENDING_EXCEPTION;
1602 THROW_CAUSE(vmSymbols::java_lang_BootstrapMethodError(), nested_exception)
1603 }
1604 }
1605
1606 void LinkResolver::resolve_invokedynamic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1607 Symbol* method_name = pool->name_ref_at(index);
1608 Symbol* method_signature = pool->signature_ref_at(index);
1609 KlassHandle current_klass = KlassHandle(THREAD, pool->pool_holder());
1610
1611 // Resolve the bootstrap specifier (BSM + optional arguments).
1612 Handle bootstrap_specifier;
1613 // Check if CallSite has been bound already:
1614 ConstantPoolCacheEntry* cpce = pool->invokedynamic_cp_cache_entry_at(index);
1615 if (cpce->is_f1_null()) {
1616 int pool_index = cpce->constant_pool_index();
1617 oop bsm_info = pool->resolve_bootstrap_specifier_at(pool_index, THREAD);
1618 wrap_invokedynamic_exception(CHECK);
1619 assert(bsm_info != NULL, "");
1620 // FIXME: Cache this once per BootstrapMethods entry, not once per CONSTANT_InvokeDynamic.
1621 bootstrap_specifier = Handle(THREAD, bsm_info);
1622 }
1623 if (!cpce->is_f1_null()) {
1624 methodHandle method( THREAD, cpce->f1_as_method());
1625 Handle appendix( THREAD, cpce->appendix_if_resolved(pool));
1626 Handle method_type(THREAD, cpce->method_type_if_resolved(pool));
1627 result.set_handle(method, appendix, method_type, THREAD);
1628 wrap_invokedynamic_exception(CHECK);
1629 return;
1630 }
1631
1632 if (TraceMethodHandles) {
1633 ResourceMark rm(THREAD);
1634 tty->print_cr("resolve_invokedynamic #%d %s %s in %s",
1635 ConstantPool::decode_invokedynamic_index(index),
1636 method_name->as_C_string(), method_signature->as_C_string(),
1637 current_klass->name()->as_C_string());
1638 tty->print(" BSM info: "); bootstrap_specifier->print();
1639 }
1640
1641 resolve_dynamic_call(result, bootstrap_specifier, method_name, method_signature, current_klass, CHECK);
1642 }
1643
1644 void LinkResolver::resolve_dynamic_call(CallInfo& result,
1645 Handle bootstrap_specifier,
1646 Symbol* method_name, Symbol* method_signature,
1647 KlassHandle current_klass,
1648 TRAPS) {
1649 // JSR 292: this must resolve to an implicitly generated method MH.linkToCallSite(*...)
1650 // The appendix argument is likely to be a freshly-created CallSite.
1651 Handle resolved_appendix;
1652 Handle resolved_method_type;
1653 methodHandle resolved_method =
1654 SystemDictionary::find_dynamic_call_site_invoker(current_klass,
1655 bootstrap_specifier,
1656 method_name, method_signature,
1657 &resolved_appendix,
1658 &resolved_method_type,
1659 THREAD);
1660 wrap_invokedynamic_exception(CHECK);
1661 result.set_handle(resolved_method, resolved_appendix, resolved_method_type, THREAD);
1662 wrap_invokedynamic_exception(CHECK);
1663 }