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 if (resolved_method.is_null()) {
94 THROW_MSG(vmSymbols::java_lang_InternalError(), "resolved method is null");
95 }
96 KlassHandle resolved_klass = SystemDictionary::MethodHandle_klass();
97 assert(resolved_method->intrinsic_id() == vmIntrinsics::_invokeBasic ||
98 resolved_method->is_compiled_lambda_form(),
99 "linkMethod must return one of these");
100 int vtable_index = Method::nonvirtual_vtable_index;
101 assert(!resolved_method->has_vtable_index(), "");
102 set_common(resolved_klass, resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK);
103 _resolved_appendix = resolved_appendix;
104 _resolved_method_type = resolved_method_type;
105 }
106
107 void CallInfo::set_common(KlassHandle resolved_klass,
108 KlassHandle selected_klass,
109 const methodHandle& resolved_method,
110 const methodHandle& selected_method,
111 CallKind kind,
112 int index,
113 TRAPS) {
114 assert(resolved_method->signature() == selected_method->signature(), "signatures must correspond");
115 _resolved_klass = resolved_klass;
116 _selected_klass = selected_klass;
117 _resolved_method = resolved_method;
118 _selected_method = selected_method;
119 _call_kind = kind;
120 _call_index = index;
121 _resolved_appendix = Handle();
122 DEBUG_ONLY(verify()); // verify before making side effects
123
124 if (CompilationPolicy::must_be_compiled(selected_method)) {
125 // This path is unusual, mostly used by the '-Xcomp' stress test mode.
126
127 // Note: with several active threads, the must_be_compiled may be true
128 // while can_be_compiled is false; remove assert
129 // assert(CompilationPolicy::can_be_compiled(selected_method), "cannot compile");
130 if (!THREAD->can_call_java()) {
131 // don't force compilation, resolve was on behalf of compiler
132 return;
133 }
134 if (selected_method->method_holder()->is_not_initialized()) {
135 // 'is_not_initialized' means not only '!is_initialized', but also that
136 // initialization has not been started yet ('!being_initialized')
137 // Do not force compilation of methods in uninitialized classes.
138 // Note that doing this would throw an assert later,
139 // in CompileBroker::compile_method.
140 // We sometimes use the link resolver to do reflective lookups
141 // even before classes are initialized.
142 return;
143 }
144 CompileBroker::compile_method(selected_method, InvocationEntryBci,
145 CompilationPolicy::policy()->initial_compile_level(),
146 methodHandle(), 0, "must_be_compiled", CHECK);
147 }
148 }
149
150 // utility query for unreflecting a method
151 CallInfo::CallInfo(Method* resolved_method, Klass* resolved_klass) {
152 Klass* resolved_method_holder = resolved_method->method_holder();
153 if (resolved_klass == NULL) { // 2nd argument defaults to holder of 1st
154 resolved_klass = resolved_method_holder;
155 }
156 _resolved_klass = resolved_klass;
157 _selected_klass = resolved_klass;
158 _resolved_method = resolved_method;
159 _selected_method = resolved_method;
160 // classify:
161 CallKind kind = CallInfo::unknown_kind;
162 int index = resolved_method->vtable_index();
163 if (resolved_method->can_be_statically_bound()) {
164 kind = CallInfo::direct_call;
165 } else if (!resolved_method_holder->is_interface()) {
166 // Could be an Object method inherited into an interface, but still a vtable call.
167 kind = CallInfo::vtable_call;
168 } else if (!resolved_klass->is_interface()) {
169 // A default or miranda method. Compute the vtable index.
170 ResourceMark rm;
171 klassVtable* vt = InstanceKlass::cast(resolved_klass)->vtable();
172 index = LinkResolver::vtable_index_of_interface_method(resolved_klass,
173 resolved_method);
174 assert(index >= 0 , "we should have valid vtable index at this point");
175
176 kind = CallInfo::vtable_call;
177 } else if (resolved_method->has_vtable_index()) {
178 // Can occur if an interface redeclares a method of Object.
179
180 #ifdef ASSERT
181 // Ensure that this is really the case.
182 KlassHandle object_klass = SystemDictionary::Object_klass();
183 Method * object_resolved_method = object_klass()->vtable()->method_at(index);
184 assert(object_resolved_method->name() == resolved_method->name(),
185 "Object and interface method names should match at vtable index %d, %s != %s",
186 index, object_resolved_method->name()->as_C_string(), resolved_method->name()->as_C_string());
187 assert(object_resolved_method->signature() == resolved_method->signature(),
188 "Object and interface method signatures should match at vtable index %d, %s != %s",
189 index, object_resolved_method->signature()->as_C_string(), resolved_method->signature()->as_C_string());
190 #endif // ASSERT
191
192 kind = CallInfo::vtable_call;
193 } else {
194 // A regular interface call.
195 kind = CallInfo::itable_call;
196 index = resolved_method->itable_index();
197 }
198 assert(index == Method::nonvirtual_vtable_index || index >= 0, "bad index %d", index);
199 _call_kind = kind;
200 _call_index = index;
201 _resolved_appendix = Handle();
202 DEBUG_ONLY(verify());
203 }
204
205 #ifdef ASSERT
206 void CallInfo::verify() {
207 switch (call_kind()) { // the meaning and allowed value of index depends on kind
208 case CallInfo::direct_call:
209 if (_call_index == Method::nonvirtual_vtable_index) break;
210 // else fall through to check vtable index:
211 case CallInfo::vtable_call:
212 assert(resolved_klass()->verify_vtable_index(_call_index), "");
213 break;
214 case CallInfo::itable_call:
215 assert(resolved_method()->method_holder()->verify_itable_index(_call_index), "");
216 break;
217 case CallInfo::unknown_kind:
218 assert(call_kind() != CallInfo::unknown_kind, "CallInfo must be set");
219 break;
220 default:
221 fatal("Unexpected call kind %d", call_kind());
222 }
223 }
224 #endif //ASSERT
225
226 #ifndef PRODUCT
227 void CallInfo::print() {
228 ResourceMark rm;
229 const char* kindstr = "unknown";
230 switch (_call_kind) {
231 case direct_call: kindstr = "direct"; break;
232 case vtable_call: kindstr = "vtable"; break;
233 case itable_call: kindstr = "itable"; break;
234 }
235 tty->print_cr("Call %s@%d %s", kindstr, _call_index,
236 _resolved_method.is_null() ? "(none)" : _resolved_method->name_and_sig_as_C_string());
237 }
238 #endif
239
240 //------------------------------------------------------------------------------------------------------------------------
241 // Implementation of LinkInfo
242
243 LinkInfo::LinkInfo(const constantPoolHandle& pool, int index, TRAPS) {
244 // resolve klass
245 Klass* result = pool->klass_ref_at(index, CHECK);
246 _resolved_klass = KlassHandle(THREAD, result);
247
248 // Get name, signature, and static klass
249 _name = pool->name_ref_at(index);
250 _signature = pool->signature_ref_at(index);
251 _tag = pool->tag_ref_at(index);
252 _current_klass = KlassHandle(THREAD, pool->pool_holder());
253
254 // Coming from the constant pool always checks access
255 _check_access = true;
256 }
257
258 char* LinkInfo::method_string() const {
259 return Method::name_and_sig_as_C_string(_resolved_klass(), _name, _signature);
260 }
261
262 #ifndef PRODUCT
263 void LinkInfo::print() {
264 ResourceMark rm;
265 tty->print_cr("Link resolved_klass=%s name=%s signature=%s current_klass=%s check_access=%s",
266 _resolved_klass->name()->as_C_string(),
267 _name->as_C_string(),
268 _signature->as_C_string(),
269 _current_klass.is_null() ? "(none)" : _current_klass->name()->as_C_string(),
270 _check_access ? "true" : "false");
271 }
272 #endif // PRODUCT
273 //------------------------------------------------------------------------------------------------------------------------
274 // Klass resolution
275
276 void LinkResolver::check_klass_accessability(KlassHandle ref_klass, KlassHandle sel_klass, TRAPS) {
277 if (!Reflection::verify_class_access(ref_klass(),
278 sel_klass(),
279 true)) {
280 ResourceMark rm(THREAD);
281 Exceptions::fthrow(
282 THREAD_AND_LOCATION,
283 vmSymbols::java_lang_IllegalAccessError(),
284 "tried to access class %s from class %s",
285 sel_klass->external_name(),
286 ref_klass->external_name()
287 );
288 return;
289 }
290 }
291
292 //------------------------------------------------------------------------------------------------------------------------
293 // Method resolution
294 //
295 // According to JVM spec. $5.4.3c & $5.4.3d
296
297 // Look up method in klasses, including static methods
298 // Then look up local default methods
299 methodHandle LinkResolver::lookup_method_in_klasses(const LinkInfo& link_info,
300 bool checkpolymorphism,
301 bool in_imethod_resolve, TRAPS) {
302 KlassHandle klass = link_info.resolved_klass();
303 Symbol* name = link_info.name();
304 Symbol* signature = link_info.signature();
305
306 // Ignore overpasses so statics can be found during resolution
307 Method* result = klass->uncached_lookup_method(name, signature, Klass::skip_overpass);
308
309 if (klass->is_array_klass()) {
310 // Only consider klass and super klass for arrays
311 return methodHandle(THREAD, result);
312 }
313
314 InstanceKlass* ik = InstanceKlass::cast(klass());
315
316 // JDK 8, JVMS 5.4.3.4: Interface method resolution should
317 // ignore static and non-public methods of java.lang.Object,
318 // like clone, finalize, registerNatives.
319 if (in_imethod_resolve &&
320 result != NULL &&
321 ik->is_interface() &&
322 (result->is_static() || !result->is_public()) &&
323 result->method_holder() == SystemDictionary::Object_klass()) {
324 result = NULL;
325 }
326
327 // Before considering default methods, check for an overpass in the
328 // current class if a method has not been found.
329 if (result == NULL) {
330 result = ik->find_method(name, signature);
331 }
332
333 if (result == NULL) {
334 Array<Method*>* default_methods = ik->default_methods();
335 if (default_methods != NULL) {
336 result = InstanceKlass::find_method(default_methods, name, signature);
337 }
338 }
339
340 if (checkpolymorphism && result != NULL) {
341 vmIntrinsics::ID iid = result->intrinsic_id();
342 if (MethodHandles::is_signature_polymorphic(iid)) {
343 // Do not link directly to these. The VM must produce a synthetic one using lookup_polymorphic_method.
344 return NULL;
345 }
346 }
347 return methodHandle(THREAD, result);
348 }
349
350 // returns first instance method
351 // Looks up method in classes, then looks up local default methods
352 methodHandle LinkResolver::lookup_instance_method_in_klasses(KlassHandle klass,
353 Symbol* name,
354 Symbol* signature, TRAPS) {
355 Method* result = klass->uncached_lookup_method(name, signature, Klass::find_overpass);
356
357 while (result != NULL && result->is_static() && result->method_holder()->super() != NULL) {
358 Klass* super_klass = result->method_holder()->super();
359 result = super_klass->uncached_lookup_method(name, signature, Klass::find_overpass);
360 }
361
362 if (klass->is_array_klass()) {
363 // Only consider klass and super klass for arrays
364 return methodHandle(THREAD, result);
365 }
366
367 if (result == NULL) {
368 Array<Method*>* default_methods = InstanceKlass::cast(klass())->default_methods();
369 if (default_methods != NULL) {
370 result = InstanceKlass::find_method(default_methods, name, signature);
371 assert(result == NULL || !result->is_static(), "static defaults not allowed");
372 }
373 }
374 return methodHandle(THREAD, result);
375 }
376
377 int LinkResolver::vtable_index_of_interface_method(KlassHandle klass,
378 const methodHandle& resolved_method) {
379
380 int vtable_index = Method::invalid_vtable_index;
381 Symbol* name = resolved_method->name();
382 Symbol* signature = resolved_method->signature();
383 InstanceKlass* ik = InstanceKlass::cast(klass());
384
385 // First check in default method array
386 if (!resolved_method->is_abstract() && ik->default_methods() != NULL) {
387 int index = InstanceKlass::find_method_index(ik->default_methods(),
388 name, signature, Klass::find_overpass,
389 Klass::find_static, Klass::find_private);
390 if (index >= 0 ) {
391 vtable_index = ik->default_vtable_indices()->at(index);
392 }
393 }
394 if (vtable_index == Method::invalid_vtable_index) {
395 // get vtable_index for miranda methods
396 ResourceMark rm;
397 klassVtable *vt = ik->vtable();
398 vtable_index = vt->index_of_miranda(name, signature);
399 }
400 return vtable_index;
401 }
402
403 methodHandle LinkResolver::lookup_method_in_interfaces(const LinkInfo& cp_info, TRAPS) {
404 InstanceKlass *ik = InstanceKlass::cast(cp_info.resolved_klass()());
405
406 // Specify 'true' in order to skip default methods when searching the
407 // interfaces. Function lookup_method_in_klasses() already looked for
408 // the method in the default methods table.
409 return methodHandle(THREAD,
410 ik->lookup_method_in_all_interfaces(cp_info.name(), cp_info.signature(),
411 Klass::skip_defaults));
412 }
413
414 methodHandle LinkResolver::lookup_polymorphic_method(
415 const LinkInfo& link_info,
416 Handle *appendix_result_or_null,
417 Handle *method_type_result,
418 TRAPS) {
419 KlassHandle klass = link_info.resolved_klass();
420 Symbol* name = link_info.name();
421 Symbol* full_signature = link_info.signature();
422
423 vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name);
424 if (TraceMethodHandles) {
425 ResourceMark rm(THREAD);
426 tty->print_cr("lookup_polymorphic_method iid=%s %s.%s%s",
427 vmIntrinsics::name_at(iid), klass->external_name(),
428 name->as_C_string(), full_signature->as_C_string());
429 }
430 if (klass() == SystemDictionary::MethodHandle_klass() &&
431 iid != vmIntrinsics::_none) {
432 if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) {
433 // Most of these do not need an up-call to Java to resolve, so can be done anywhere.
434 // Do not erase last argument type (MemberName) if it is a static linkTo method.
435 bool keep_last_arg = MethodHandles::is_signature_polymorphic_static(iid);
436 TempNewSymbol basic_signature =
437 MethodHandles::lookup_basic_type_signature(full_signature, keep_last_arg, CHECK_NULL);
438 if (TraceMethodHandles) {
439 ResourceMark rm(THREAD);
440 tty->print_cr("lookup_polymorphic_method %s %s => basic %s",
441 name->as_C_string(),
442 full_signature->as_C_string(),
443 basic_signature->as_C_string());
444 }
445 methodHandle result = SystemDictionary::find_method_handle_intrinsic(iid,
446 basic_signature,
447 CHECK_NULL);
448 if (result.not_null()) {
449 assert(result->is_method_handle_intrinsic(), "MH.invokeBasic or MH.linkTo* intrinsic");
450 assert(result->intrinsic_id() != vmIntrinsics::_invokeGeneric, "wrong place to find this");
451 assert(basic_signature == result->signature(), "predict the result signature");
452 if (TraceMethodHandles) {
453 tty->print("lookup_polymorphic_method => intrinsic ");
454 result->print_on(tty);
455 }
456 }
457 return result;
458 } else if (iid == vmIntrinsics::_invokeGeneric
459 && THREAD->can_call_java()
460 && appendix_result_or_null != NULL) {
461 // This is a method with type-checking semantics.
462 // We will ask Java code to spin an adapter method for it.
463 if (!MethodHandles::enabled()) {
464 // Make sure the Java part of the runtime has been booted up.
465 Klass* natives = SystemDictionary::MethodHandleNatives_klass();
466 if (natives == NULL || InstanceKlass::cast(natives)->is_not_initialized()) {
467 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_invoke_MethodHandleNatives(),
468 Handle(),
469 Handle(),
470 true,
471 CHECK_NULL);
472 }
473 }
474
475 Handle appendix;
476 Handle method_type;
477 methodHandle result = SystemDictionary::find_method_handle_invoker(
478 name,
479 full_signature,
480 link_info.current_klass(),
481 &appendix,
482 &method_type,
483 CHECK_NULL);
484 if (TraceMethodHandles) {
485 tty->print("lookup_polymorphic_method => (via Java) ");
486 result->print_on(tty);
487 tty->print(" lookup_polymorphic_method => appendix = ");
488 if (appendix.is_null()) tty->print_cr("(none)");
489 else appendix->print_on(tty);
490 }
491 if (result.not_null()) {
492 #ifdef ASSERT
493 ResourceMark rm(THREAD);
494
495 TempNewSymbol basic_signature =
496 MethodHandles::lookup_basic_type_signature(full_signature, CHECK_NULL);
497 int actual_size_of_params = result->size_of_parameters();
498 int expected_size_of_params = ArgumentSizeComputer(basic_signature).size();
499 // +1 for MethodHandle.this, +1 for trailing MethodType
500 if (!MethodHandles::is_signature_polymorphic_static(iid)) expected_size_of_params += 1;
501 if (appendix.not_null()) expected_size_of_params += 1;
502 if (actual_size_of_params != expected_size_of_params) {
503 tty->print_cr("*** basic_signature=%s", basic_signature->as_C_string());
504 tty->print_cr("*** result for %s: ", vmIntrinsics::name_at(iid));
505 result->print();
506 }
507 assert(actual_size_of_params == expected_size_of_params,
508 "%d != %d", actual_size_of_params, expected_size_of_params);
509 #endif //ASSERT
510
511 assert(appendix_result_or_null != NULL, "");
512 (*appendix_result_or_null) = appendix;
513 (*method_type_result) = method_type;
514 }
515 return result;
516 }
517 }
518 return NULL;
519 }
520
521 void LinkResolver::check_method_accessability(KlassHandle ref_klass,
522 KlassHandle resolved_klass,
523 KlassHandle sel_klass,
524 const methodHandle& sel_method,
525 TRAPS) {
526
527 AccessFlags flags = sel_method->access_flags();
528
529 // Special case: arrays always override "clone". JVMS 2.15.
530 // If the resolved klass is an array class, and the declaring class
531 // is java.lang.Object and the method is "clone", set the flags
532 // to public.
533 //
534 // We'll check for the method name first, as that's most likely
535 // to be false (so we'll short-circuit out of these tests).
536 if (sel_method->name() == vmSymbols::clone_name() &&
537 sel_klass() == SystemDictionary::Object_klass() &&
538 resolved_klass->is_array_klass()) {
539 // We need to change "protected" to "public".
540 assert(flags.is_protected(), "clone not protected?");
541 jint new_flags = flags.as_int();
542 new_flags = new_flags & (~JVM_ACC_PROTECTED);
543 new_flags = new_flags | JVM_ACC_PUBLIC;
544 flags.set_flags(new_flags);
545 }
546 // assert(extra_arg_result_or_null != NULL, "must be able to return extra argument");
547
548 if (!Reflection::verify_field_access(ref_klass(),
549 resolved_klass(),
550 sel_klass(),
551 flags,
552 true)) {
553 ResourceMark rm(THREAD);
554 Exceptions::fthrow(
555 THREAD_AND_LOCATION,
556 vmSymbols::java_lang_IllegalAccessError(),
557 "tried to access method %s.%s%s from class %s",
558 sel_klass->external_name(),
559 sel_method->name()->as_C_string(),
560 sel_method->signature()->as_C_string(),
561 ref_klass->external_name()
562 );
563 return;
564 }
565 }
566
567 methodHandle LinkResolver::resolve_method_statically(Bytecodes::Code code,
568 const constantPoolHandle& pool, int index, TRAPS) {
569 // This method is used only
570 // (1) in C2 from InlineTree::ok_to_inline (via ciMethod::check_call),
571 // and
572 // (2) in Bytecode_invoke::static_target
573 // It appears to fail when applied to an invokeinterface call site.
574 // FIXME: Remove this method and ciMethod::check_call; refactor to use the other LinkResolver entry points.
575 // resolve klass
576 KlassHandle resolved_klass;
577 if (code == Bytecodes::_invokedynamic) {
578 resolved_klass = SystemDictionary::MethodHandle_klass();
579 Symbol* method_name = vmSymbols::invoke_name();
580 Symbol* method_signature = pool->signature_ref_at(index);
581 KlassHandle current_klass(THREAD, pool->pool_holder());
582 LinkInfo link_info(resolved_klass, method_name, method_signature, current_klass);
583 return resolve_method(link_info, /*require_methodref*/false, THREAD);
584 }
585
586 LinkInfo link_info(pool, index, CHECK_NULL);
587 resolved_klass = link_info.resolved_klass();
588
589 if (pool->has_preresolution()
590 || (resolved_klass() == SystemDictionary::MethodHandle_klass() &&
591 MethodHandles::is_signature_polymorphic_name(resolved_klass(), link_info.name()))) {
592 Method* result = ConstantPool::method_at_if_loaded(pool, index);
593 if (result != NULL) {
594 return methodHandle(THREAD, result);
595 }
596 }
597
598 if (code == Bytecodes::_invokeinterface) {
599 return resolve_interface_method(link_info, true, THREAD);
600 } else if (code == Bytecodes::_invokevirtual) {
601 return resolve_method(link_info, /*require_methodref*/true, THREAD);
602 } else if (!resolved_klass->is_interface()) {
603 return resolve_method(link_info, /*require_methodref*/false, THREAD);
604 } else {
605 bool nostatics = (code == Bytecodes::_invokestatic) ? false : true;
606 return resolve_interface_method(link_info, nostatics, THREAD);
607 }
608 }
609
610 // Check and print a loader constraint violation message for method or interface method
611 void LinkResolver::check_method_loader_constraints(const LinkInfo& link_info,
612 const methodHandle& resolved_method,
613 const char* method_type, TRAPS) {
614 Handle current_loader(THREAD, link_info.current_klass()->class_loader());
615 Handle resolved_loader(THREAD, resolved_method->method_holder()->class_loader());
616
617 ResourceMark rm(THREAD);
618 Symbol* failed_type_symbol =
619 SystemDictionary::check_signature_loaders(link_info.signature(), current_loader,
620 resolved_loader, true, CHECK);
621 if (failed_type_symbol != NULL) {
622 const char* msg = "loader constraint violation: when resolving %s"
623 " \"%s\" the class loader (instance of %s) of the current class, %s,"
624 " and the class loader (instance of %s) for the method's defining class, %s, have"
625 " different Class objects for the type %s used in the signature";
626 char* sig = link_info.method_string();
627 const char* loader1_name = SystemDictionary::loader_name(current_loader());
628 char* current = link_info.current_klass()->name()->as_C_string();
629 const char* loader2_name = SystemDictionary::loader_name(resolved_loader());
630 char* target = resolved_method->method_holder()->name()->as_C_string();
631 char* failed_type_name = failed_type_symbol->as_C_string();
632 size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1_name) +
633 strlen(current) + strlen(loader2_name) + strlen(target) +
634 strlen(failed_type_name) + strlen(method_type) + 1;
635 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen);
636 jio_snprintf(buf, buflen, msg, method_type, sig, loader1_name, current, loader2_name,
637 target, failed_type_name);
638 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf);
639 }
640 }
641
642 void LinkResolver::check_field_loader_constraints(Symbol* field, Symbol* sig,
643 KlassHandle current_klass,
644 KlassHandle sel_klass, TRAPS) {
645 Handle ref_loader(THREAD, current_klass->class_loader());
646 Handle sel_loader(THREAD, sel_klass->class_loader());
647
648 ResourceMark rm(THREAD); // needed for check_signature_loaders
649 Symbol* failed_type_symbol =
650 SystemDictionary::check_signature_loaders(sig,
651 ref_loader, sel_loader,
652 false,
653 CHECK);
654 if (failed_type_symbol != NULL) {
655 const char* msg = "loader constraint violation: when resolving field"
656 " \"%s\" the class loader (instance of %s) of the referring class, "
657 "%s, and the class loader (instance of %s) for the field's resolved "
658 "type, %s, have different Class objects for that type";
659 char* field_name = field->as_C_string();
660 const char* loader1_name = SystemDictionary::loader_name(ref_loader());
661 char* sel = sel_klass->name()->as_C_string();
662 const char* loader2_name = SystemDictionary::loader_name(sel_loader());
663 char* failed_type_name = failed_type_symbol->as_C_string();
664 size_t buflen = strlen(msg) + strlen(field_name) + strlen(loader1_name) +
665 strlen(sel) + strlen(loader2_name) + strlen(failed_type_name) + 1;
666 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen);
667 jio_snprintf(buf, buflen, msg, field_name, loader1_name, sel, loader2_name,
668 failed_type_name);
669 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf);
670 }
671 }
672
673 methodHandle LinkResolver::resolve_method(const LinkInfo& link_info,
674 bool require_methodref, TRAPS) {
675
676 Handle nested_exception;
677 KlassHandle resolved_klass = link_info.resolved_klass();
678
679 // 1. check if methodref required, that resolved_klass is not interfacemethodref
680 if (require_methodref && resolved_klass->is_interface()) {
681 ResourceMark rm(THREAD);
682 char buf[200];
683 jio_snprintf(buf, sizeof(buf), "Found interface %s, but class was expected",
684 resolved_klass()->external_name());
685 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
686 }
687
688 // check tag at call is method
689 if (!link_info.tag().is_invalid() && !link_info.tag().is_method()) {
690 ResourceMark rm(THREAD);
691 char buf[200];
692 jio_snprintf(buf, sizeof(buf), "Resolving to non regular method %s", link_info.method_string());
693 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
694 }
695
696
697 // 2. lookup method in resolved klass and its super klasses
698 methodHandle resolved_method = lookup_method_in_klasses(link_info, true, false, CHECK_NULL);
699
700 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) { // not found in the class hierarchy
701 // 3. lookup method in all the interfaces implemented by the resolved klass
702 resolved_method = lookup_method_in_interfaces(link_info, CHECK_NULL);
703
704 if (resolved_method.is_null()) {
705 // JSR 292: see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc
706 resolved_method = lookup_polymorphic_method(link_info, (Handle*)NULL, (Handle*)NULL, THREAD);
707 if (HAS_PENDING_EXCEPTION) {
708 nested_exception = Handle(THREAD, PENDING_EXCEPTION);
709 CLEAR_PENDING_EXCEPTION;
710 }
711 }
712 }
713
714 if (resolved_method.is_null()) {
715 // 4. method lookup failed
716 ResourceMark rm(THREAD);
717 THROW_MSG_CAUSE_(vmSymbols::java_lang_NoSuchMethodError(),
718 Method::name_and_sig_as_C_string(resolved_klass(),
719 link_info.name(),
720 link_info.signature()),
721 nested_exception, NULL);
722 }
723
724 // 5. access checks, access checking may be turned off when calling from within the VM.
725 KlassHandle current_klass = link_info.current_klass();
726 if (link_info.check_access()) {
727 assert(current_klass.not_null() , "current_klass should not be null");
728
729 // check if method can be accessed by the referring class
730 check_method_accessability(current_klass,
731 resolved_klass,
732 KlassHandle(THREAD, resolved_method->method_holder()),
733 resolved_method,
734 CHECK_NULL);
735
736 // check loader constraints
737 check_method_loader_constraints(link_info, resolved_method, "method", CHECK_NULL);
738 }
739
740 return resolved_method;
741 }
742
743 static void trace_method_resolution(const char* prefix,
744 KlassHandle klass,
745 KlassHandle resolved_klass,
746 const methodHandle& method,
747 bool logitables,
748 int index = -1) {
749 #ifndef PRODUCT
750 ResourceMark rm;
751 outputStream* st;
752 if (logitables) {
753 st = LogHandle(itables)::trace_stream();
754 } else {
755 st = LogHandle(vtables)::trace_stream();
756 }
757 st->print("%s%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ",
758 prefix,
759 (klass.is_null() ? "<NULL>" : klass->internal_name()),
760 (resolved_klass.is_null() ? "<NULL>" : resolved_klass->internal_name()),
761 Method::name_and_sig_as_C_string(resolved_klass(),
762 method->name(),
763 method->signature()),
764 method->method_holder()->internal_name());
765 method->print_linkage_flags(st);
766 if (index != -1) {
767 st->print("vtable_index:%d", index);
768 }
769 st->cr();
770 #endif // PRODUCT
771 }
772
773 methodHandle LinkResolver::resolve_interface_method(const LinkInfo& link_info,
774 bool nostatics, TRAPS) {
775
776 KlassHandle resolved_klass = link_info.resolved_klass();
777
778 // check if klass is interface
779 if (!resolved_klass->is_interface()) {
780 ResourceMark rm(THREAD);
781 char buf[200];
782 jio_snprintf(buf, sizeof(buf), "Found class %s, but interface was expected", resolved_klass()->external_name());
783 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
784 }
785
786 // check tag at call is an interface method
787 if (!link_info.tag().is_invalid() && !link_info.tag().is_interface_method()) {
788 ResourceMark rm(THREAD);
789 char buf[200];
790 jio_snprintf(buf, sizeof(buf), "Resolving to non interface method %s", link_info.method_string());
791 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
792 }
793
794 // lookup method in this interface or its super, java.lang.Object
795 // JDK8: also look for static methods
796 methodHandle resolved_method = lookup_method_in_klasses(link_info, false, true, CHECK_NULL);
797
798 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) {
799 // lookup method in all the super-interfaces
800 resolved_method = lookup_method_in_interfaces(link_info, CHECK_NULL);
801 }
802
803 if (resolved_method.is_null()) {
804 // no method found
805 ResourceMark rm(THREAD);
806 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(),
807 Method::name_and_sig_as_C_string(resolved_klass(),
808 link_info.name(),
809 link_info.signature()));
810 }
811
812 if (link_info.check_access()) {
813 // JDK8 adds non-public interface methods, and accessability check requirement
814 KlassHandle current_klass = link_info.current_klass();
815
816 assert(current_klass.not_null() , "current_klass should not be null");
817
818 // check if method can be accessed by the referring class
819 check_method_accessability(current_klass,
820 resolved_klass,
821 KlassHandle(THREAD, resolved_method->method_holder()),
822 resolved_method,
823 CHECK_NULL);
824
825 check_method_loader_constraints(link_info, resolved_method, "interface method", CHECK_NULL);
826 }
827
828 if (nostatics && resolved_method->is_static()) {
829 ResourceMark rm(THREAD);
830 char buf[200];
831 jio_snprintf(buf, sizeof(buf), "Expected instance not static method %s",
832 Method::name_and_sig_as_C_string(resolved_klass(),
833 resolved_method->name(), resolved_method->signature()));
834 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
835 }
836
837 if (develop_log_is_enabled(Trace, itables)) {
838 trace_method_resolution("invokeinterface resolved method: caller-class",
839 link_info.current_klass(), resolved_klass,
840 resolved_method, true);
841 }
842
843 return resolved_method;
844 }
845
846 //------------------------------------------------------------------------------------------------------------------------
847 // Field resolution
848
849 void LinkResolver::check_field_accessability(KlassHandle ref_klass,
850 KlassHandle resolved_klass,
851 KlassHandle sel_klass,
852 const fieldDescriptor& fd,
853 TRAPS) {
854 if (!Reflection::verify_field_access(ref_klass(),
855 resolved_klass(),
856 sel_klass(),
857 fd.access_flags(),
858 true)) {
859 ResourceMark rm(THREAD);
860 Exceptions::fthrow(
861 THREAD_AND_LOCATION,
862 vmSymbols::java_lang_IllegalAccessError(),
863 "tried to access field %s.%s from class %s",
864 sel_klass->external_name(),
865 fd.name()->as_C_string(),
866 ref_klass->external_name()
867 );
868 return;
869 }
870 }
871
872 void LinkResolver::resolve_field_access(fieldDescriptor& fd, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) {
873 LinkInfo link_info(pool, index, CHECK);
874 resolve_field(fd, link_info, byte, true, CHECK);
875 }
876
877 void LinkResolver::resolve_field(fieldDescriptor& fd,
878 const LinkInfo& link_info,
879 Bytecodes::Code byte, bool initialize_class,
880 TRAPS) {
881 assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic ||
882 byte == Bytecodes::_getfield || byte == Bytecodes::_putfield ||
883 byte == Bytecodes::_nofast_getfield || byte == Bytecodes::_nofast_putfield ||
884 (byte == Bytecodes::_nop && !link_info.check_access()), "bad field access bytecode");
885
886 bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic);
887 bool is_put = (byte == Bytecodes::_putfield || byte == Bytecodes::_putstatic || byte == Bytecodes::_nofast_putfield);
888 // Check if there's a resolved klass containing the field
889 KlassHandle resolved_klass = link_info.resolved_klass();
890 Symbol* field = link_info.name();
891 Symbol* sig = link_info.signature();
892
893 if (resolved_klass.is_null()) {
894 ResourceMark rm(THREAD);
895 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
896 }
897
898 // Resolve instance field
899 KlassHandle sel_klass(THREAD, resolved_klass->find_field(field, sig, &fd));
900 // check if field exists; i.e., if a klass containing the field def has been selected
901 if (sel_klass.is_null()) {
902 ResourceMark rm(THREAD);
903 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
904 }
905
906 if (!link_info.check_access())
907 // Access checking may be turned off when calling from within the VM.
908 return;
909
910 // check access
911 KlassHandle current_klass = link_info.current_klass();
912 check_field_accessability(current_klass, resolved_klass, sel_klass, fd, CHECK);
913
914 // check for errors
915 if (is_static != fd.is_static()) {
916 ResourceMark rm(THREAD);
917 char msg[200];
918 jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", resolved_klass()->external_name(), fd.name()->as_C_string());
919 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg);
920 }
921
922 // Final fields can only be accessed from its own class.
923 if (is_put && fd.access_flags().is_final() && sel_klass() != current_klass()) {
924 THROW(vmSymbols::java_lang_IllegalAccessError());
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(),
972 link_info.check_access() ? LinkInfo::needs_access_check : LinkInfo::skip_access_check);
973 resolved_method = linktime_resolve_static_method(new_info, CHECK);
974 }
975
976 assert(save_resolved_method == resolved_method(), "does this change?");
977 // setup result
978 result.set_static(resolved_klass, resolved_method, CHECK);
979 }
980
981 // throws linktime exceptions
982 methodHandle LinkResolver::linktime_resolve_static_method(const LinkInfo& link_info, TRAPS) {
983
984 KlassHandle resolved_klass = link_info.resolved_klass();
985 methodHandle resolved_method;
986 if (!resolved_klass->is_interface()) {
987 resolved_method = resolve_method(link_info, /*require_methodref*/false, CHECK_NULL);
988 } else {
989 resolved_method = resolve_interface_method(link_info, /*nostatics*/false, CHECK_NULL);
990 }
991 assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier");
992
993 // check if static
994 if (!resolved_method->is_static()) {
995 ResourceMark rm(THREAD);
996 char buf[200];
997 jio_snprintf(buf, sizeof(buf), "Expected static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
998 resolved_method->name(),
999 resolved_method->signature()));
1000 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1001 }
1002 return resolved_method;
1003 }
1004
1005
1006 void LinkResolver::resolve_special_call(CallInfo& result,
1007 const LinkInfo& link_info,
1008 TRAPS) {
1009 methodHandle resolved_method = linktime_resolve_special_method(link_info, CHECK);
1010 runtime_resolve_special_method(result, resolved_method,
1011 link_info.resolved_klass(),
1012 link_info.current_klass(),
1013 link_info.check_access(), CHECK);
1014 }
1015
1016 // throws linktime exceptions
1017 methodHandle LinkResolver::linktime_resolve_special_method(const LinkInfo& link_info,
1018 TRAPS) {
1019
1020 // Invokespecial is called for multiple special reasons:
1021 // <init>
1022 // local private method invocation, for classes and interfaces
1023 // superclass.method, which can also resolve to a default method
1024 // and the selected method is recalculated relative to the direct superclass
1025 // superinterface.method, which explicitly does not check shadowing
1026 KlassHandle resolved_klass = link_info.resolved_klass();
1027 methodHandle resolved_method;
1028
1029 if (!resolved_klass->is_interface()) {
1030 resolved_method = resolve_method(link_info, /*require_methodref*/false, CHECK_NULL);
1031 } else {
1032 resolved_method = resolve_interface_method(link_info, /*nostatics*/true, CHECK_NULL);
1033 }
1034
1035 // check if method name is <init>, that it is found in same klass as static type
1036 if (resolved_method->name() == vmSymbols::object_initializer_name() &&
1037 resolved_method->method_holder() != resolved_klass()) {
1038 ResourceMark rm(THREAD);
1039 Exceptions::fthrow(
1040 THREAD_AND_LOCATION,
1041 vmSymbols::java_lang_NoSuchMethodError(),
1042 "%s: method %s%s not found",
1043 resolved_klass->external_name(),
1044 resolved_method->name()->as_C_string(),
1045 resolved_method->signature()->as_C_string()
1046 );
1047 return NULL;
1048 }
1049
1050 // check if invokespecial's interface method reference is in an indirect superinterface
1051 KlassHandle current_klass = link_info.current_klass();
1052 if (!current_klass.is_null() && resolved_klass->is_interface()) {
1053 Klass *klass_to_check = !InstanceKlass::cast(current_klass())->is_anonymous() ?
1054 current_klass() :
1055 InstanceKlass::cast(current_klass())->host_klass();
1056 // Disable verification for the dynamically-generated reflection bytecodes.
1057 bool is_reflect = klass_to_check->is_subclass_of(
1058 SystemDictionary::reflect_MagicAccessorImpl_klass());
1059
1060 if (!is_reflect &&
1061 !InstanceKlass::cast(klass_to_check)->is_same_or_direct_interface(resolved_klass())) {
1062 ResourceMark rm(THREAD);
1063 char buf[200];
1064 jio_snprintf(buf, sizeof(buf),
1065 "Interface method reference: %s, is in an indirect superinterface of %s",
1066 Method::name_and_sig_as_C_string(resolved_klass(),
1067 resolved_method->name(),
1068 resolved_method->signature()),
1069 current_klass->external_name());
1070 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1071 }
1072 }
1073
1074 // check if not static
1075 if (resolved_method->is_static()) {
1076 ResourceMark rm(THREAD);
1077 char buf[200];
1078 jio_snprintf(buf, sizeof(buf),
1079 "Expecting non-static method %s",
1080 Method::name_and_sig_as_C_string(resolved_klass(),
1081 resolved_method->name(),
1082 resolved_method->signature()));
1083 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1084 }
1085
1086 if (develop_log_is_enabled(Trace, itables)) {
1087 trace_method_resolution("invokespecial resolved method: caller-class:",
1088 current_klass, resolved_klass, resolved_method, true);
1089 }
1090
1091 return resolved_method;
1092 }
1093
1094 // throws runtime exceptions
1095 void LinkResolver::runtime_resolve_special_method(CallInfo& result,
1096 const methodHandle& resolved_method,
1097 KlassHandle resolved_klass,
1098 KlassHandle current_klass,
1099 bool check_access, TRAPS) {
1100
1101 // resolved method is selected method unless we have an old-style lookup
1102 // for a superclass method
1103 // Invokespecial for a superinterface, resolved method is selected method,
1104 // no checks for shadowing
1105 methodHandle sel_method(THREAD, resolved_method());
1106
1107 // check if this is an old-style super call and do a new lookup if so
1108 { KlassHandle method_klass = KlassHandle(THREAD,
1109 resolved_method->method_holder());
1110
1111 if (check_access &&
1112 // a) check if ACC_SUPER flag is set for the current class
1113 (current_klass->is_super() || !AllowNonVirtualCalls) &&
1114 // b) check if the class of the resolved_klass is a superclass
1115 // (not supertype in order to exclude interface classes) of the current class.
1116 // This check is not performed for super.invoke for interface methods
1117 // in super interfaces.
1118 current_klass->is_subclass_of(resolved_klass()) &&
1119 current_klass() != resolved_klass() &&
1120 // c) check if the method is not <init>
1121 resolved_method->name() != vmSymbols::object_initializer_name()) {
1122 // Lookup super method
1123 KlassHandle super_klass(THREAD, current_klass->super());
1124 sel_method = lookup_instance_method_in_klasses(super_klass,
1125 resolved_method->name(),
1126 resolved_method->signature(), CHECK);
1127 // check if found
1128 if (sel_method.is_null()) {
1129 ResourceMark rm(THREAD);
1130 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1131 Method::name_and_sig_as_C_string(resolved_klass(),
1132 resolved_method->name(),
1133 resolved_method->signature()));
1134 }
1135 }
1136 }
1137
1138 // check if not static
1139 if (sel_method->is_static()) {
1140 ResourceMark rm(THREAD);
1141 char buf[200];
1142 jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
1143 resolved_method->name(),
1144 resolved_method->signature()));
1145 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1146 }
1147
1148 // check if abstract
1149 if (sel_method->is_abstract()) {
1150 ResourceMark rm(THREAD);
1151 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1152 Method::name_and_sig_as_C_string(resolved_klass(),
1153 sel_method->name(),
1154 sel_method->signature()));
1155 }
1156
1157 if (develop_log_is_enabled(Trace, itables)) {
1158 trace_method_resolution("invokespecial selected method: resolved-class:",
1159 resolved_klass, resolved_klass, sel_method, true);
1160 }
1161
1162 // setup result
1163 result.set_static(resolved_klass, sel_method, CHECK);
1164 }
1165
1166 void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, KlassHandle receiver_klass,
1167 const LinkInfo& link_info,
1168 bool check_null_and_abstract, TRAPS) {
1169 methodHandle resolved_method = linktime_resolve_virtual_method(link_info, CHECK);
1170 runtime_resolve_virtual_method(result, resolved_method,
1171 link_info.resolved_klass(),
1172 recv, receiver_klass,
1173 check_null_and_abstract, CHECK);
1174 }
1175
1176 // throws linktime exceptions
1177 methodHandle LinkResolver::linktime_resolve_virtual_method(const LinkInfo& link_info,
1178 TRAPS) {
1179 // normal method resolution
1180 methodHandle resolved_method = resolve_method(link_info, /*require_methodref*/true, CHECK_NULL);
1181
1182 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1183 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1184
1185 // check if private interface method
1186 KlassHandle resolved_klass = link_info.resolved_klass();
1187 KlassHandle current_klass = link_info.current_klass();
1188
1189 if (resolved_klass->is_interface() && resolved_method->is_private()) {
1190 ResourceMark rm(THREAD);
1191 char buf[200];
1192 jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokevirtual: method %s, caller-class:%s",
1193 Method::name_and_sig_as_C_string(resolved_klass(),
1194 resolved_method->name(),
1195 resolved_method->signature()),
1196 (current_klass.is_null() ? "<NULL>" : current_klass->internal_name()));
1197 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1198 }
1199
1200 // check if not static
1201 if (resolved_method->is_static()) {
1202 ResourceMark rm(THREAD);
1203 char buf[200];
1204 jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
1205 resolved_method->name(),
1206 resolved_method->signature()));
1207 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1208 }
1209
1210 if (develop_log_is_enabled(Trace, vtables)) {
1211 trace_method_resolution("invokevirtual resolved method: caller-class:",
1212 current_klass, resolved_klass, resolved_method, false);
1213 }
1214
1215 return resolved_method;
1216 }
1217
1218 // throws runtime exceptions
1219 void LinkResolver::runtime_resolve_virtual_method(CallInfo& result,
1220 const methodHandle& resolved_method,
1221 KlassHandle resolved_klass,
1222 Handle recv,
1223 KlassHandle recv_klass,
1224 bool check_null_and_abstract,
1225 TRAPS) {
1226
1227 // setup default return values
1228 int vtable_index = Method::invalid_vtable_index;
1229 methodHandle selected_method;
1230
1231 assert(recv.is_null() || recv->is_oop(), "receiver is not an oop");
1232
1233 // runtime method resolution
1234 if (check_null_and_abstract && recv.is_null()) { // check if receiver exists
1235 THROW(vmSymbols::java_lang_NullPointerException());
1236 }
1237
1238 // Virtual methods cannot be resolved before its klass has been linked, for otherwise the Method*'s
1239 // has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since
1240 // a missing receiver might result in a bogus lookup.
1241 assert(resolved_method->method_holder()->is_linked(), "must be linked");
1242
1243 // do lookup based on receiver klass using the vtable index
1244 if (resolved_method->method_holder()->is_interface()) { // default or miranda method
1245 vtable_index = vtable_index_of_interface_method(resolved_klass,
1246 resolved_method);
1247 assert(vtable_index >= 0 , "we should have valid vtable index at this point");
1248
1249 InstanceKlass* inst = InstanceKlass::cast(recv_klass());
1250 selected_method = methodHandle(THREAD, inst->method_at_vtable(vtable_index));
1251 } else {
1252 // at this point we are sure that resolved_method is virtual and not
1253 // a default or miranda method; therefore, it must have a valid vtable index.
1254 assert(!resolved_method->has_itable_index(), "");
1255 vtable_index = resolved_method->vtable_index();
1256 // We could get a negative vtable_index for final methods,
1257 // because as an optimization they are they are never put in the vtable,
1258 // unless they override an existing method.
1259 // If we do get a negative, it means the resolved method is the the selected
1260 // method, and it can never be changed by an override.
1261 if (vtable_index == Method::nonvirtual_vtable_index) {
1262 assert(resolved_method->can_be_statically_bound(), "cannot override this method");
1263 selected_method = resolved_method;
1264 } else {
1265 // recv_klass might be an arrayKlassOop but all vtables start at
1266 // the same place. The cast is to avoid virtual call and assertion.
1267 InstanceKlass* inst = (InstanceKlass*)recv_klass();
1268 selected_method = methodHandle(THREAD, inst->method_at_vtable(vtable_index));
1269 }
1270 }
1271
1272 // check if method exists
1273 if (selected_method.is_null()) {
1274 ResourceMark rm(THREAD);
1275 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1276 Method::name_and_sig_as_C_string(resolved_klass(),
1277 resolved_method->name(),
1278 resolved_method->signature()));
1279 }
1280
1281 // check if abstract
1282 if (check_null_and_abstract && selected_method->is_abstract()) {
1283 ResourceMark rm(THREAD);
1284 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1285 Method::name_and_sig_as_C_string(resolved_klass(),
1286 selected_method->name(),
1287 selected_method->signature()));
1288 }
1289
1290 if (develop_log_is_enabled(Trace, vtables)) {
1291 trace_method_resolution("invokevirtual selected method: receiver-class:",
1292 recv_klass, resolved_klass, selected_method,
1293 false, vtable_index);
1294 }
1295 // setup result
1296 result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK);
1297 }
1298
1299 void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, KlassHandle recv_klass,
1300 const LinkInfo& link_info,
1301 bool check_null_and_abstract, TRAPS) {
1302 // throws linktime exceptions
1303 methodHandle resolved_method = linktime_resolve_interface_method(link_info, CHECK);
1304 runtime_resolve_interface_method(result, resolved_method,link_info.resolved_klass(),
1305 recv, recv_klass, check_null_and_abstract, CHECK);
1306 }
1307
1308 methodHandle LinkResolver::linktime_resolve_interface_method(const LinkInfo& link_info,
1309 TRAPS) {
1310 // normal interface method resolution
1311 methodHandle resolved_method = resolve_interface_method(link_info, true, CHECK_NULL);
1312 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1313 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1314
1315 return resolved_method;
1316 }
1317
1318 // throws runtime exceptions
1319 void LinkResolver::runtime_resolve_interface_method(CallInfo& result,
1320 const methodHandle& resolved_method,
1321 KlassHandle resolved_klass,
1322 Handle recv,
1323 KlassHandle recv_klass,
1324 bool check_null_and_abstract, TRAPS) {
1325 // check if receiver exists
1326 if (check_null_and_abstract && recv.is_null()) {
1327 THROW(vmSymbols::java_lang_NullPointerException());
1328 }
1329
1330 // check if private interface method
1331 if (resolved_klass->is_interface() && resolved_method->is_private()) {
1332 ResourceMark rm(THREAD);
1333 char buf[200];
1334 jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokeinterface: method %s",
1335 Method::name_and_sig_as_C_string(resolved_klass(),
1336 resolved_method->name(),
1337 resolved_method->signature()));
1338 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1339 }
1340
1341 // check if receiver klass implements the resolved interface
1342 if (!recv_klass->is_subtype_of(resolved_klass())) {
1343 ResourceMark rm(THREAD);
1344 char buf[200];
1345 jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s",
1346 recv_klass()->external_name(),
1347 resolved_klass()->external_name());
1348 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1349 }
1350
1351 // do lookup based on receiver klass
1352 // This search must match the linktime preparation search for itable initialization
1353 // to correctly enforce loader constraints for interface method inheritance
1354 methodHandle sel_method = lookup_instance_method_in_klasses(recv_klass,
1355 resolved_method->name(),
1356 resolved_method->signature(), CHECK);
1357 if (sel_method.is_null() && !check_null_and_abstract) {
1358 // In theory this is a harmless placeholder value, but
1359 // in practice leaving in null affects the nsk default method tests.
1360 // This needs further study.
1361 sel_method = resolved_method;
1362 }
1363 // check if method exists
1364 if (sel_method.is_null()) {
1365 ResourceMark rm(THREAD);
1366 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1367 Method::name_and_sig_as_C_string(recv_klass(),
1368 resolved_method->name(),
1369 resolved_method->signature()));
1370 }
1371 // check access
1372 // Throw Illegal Access Error if sel_method is not public.
1373 if (!sel_method->is_public()) {
1374 ResourceMark rm(THREAD);
1375 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(),
1376 Method::name_and_sig_as_C_string(recv_klass(),
1377 sel_method->name(),
1378 sel_method->signature()));
1379 }
1380 // check if abstract
1381 if (check_null_and_abstract && sel_method->is_abstract()) {
1382 ResourceMark rm(THREAD);
1383 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1384 Method::name_and_sig_as_C_string(recv_klass(),
1385 sel_method->name(),
1386 sel_method->signature()));
1387 }
1388
1389 if (develop_log_is_enabled(Trace, itables)) {
1390 trace_method_resolution("invokeinterface selected method: receiver-class",
1391 recv_klass, resolved_klass, sel_method, true);
1392 }
1393 // setup result
1394 if (!resolved_method->has_itable_index()) {
1395 int vtable_index = resolved_method->vtable_index();
1396 assert(vtable_index == sel_method->vtable_index(), "sanity check");
1397 result.set_virtual(resolved_klass, recv_klass, resolved_method, sel_method, vtable_index, CHECK);
1398 } else {
1399 int itable_index = resolved_method()->itable_index();
1400 result.set_interface(resolved_klass, recv_klass, resolved_method, sel_method, itable_index, CHECK);
1401 }
1402 }
1403
1404
1405 methodHandle LinkResolver::linktime_resolve_interface_method_or_null(
1406 const LinkInfo& link_info) {
1407 EXCEPTION_MARK;
1408 methodHandle method_result = linktime_resolve_interface_method(link_info, THREAD);
1409 if (HAS_PENDING_EXCEPTION) {
1410 CLEAR_PENDING_EXCEPTION;
1411 return methodHandle();
1412 } else {
1413 return method_result;
1414 }
1415 }
1416
1417 methodHandle LinkResolver::linktime_resolve_virtual_method_or_null(
1418 const LinkInfo& link_info) {
1419 EXCEPTION_MARK;
1420 methodHandle method_result = linktime_resolve_virtual_method(link_info, THREAD);
1421 if (HAS_PENDING_EXCEPTION) {
1422 CLEAR_PENDING_EXCEPTION;
1423 return methodHandle();
1424 } else {
1425 return method_result;
1426 }
1427 }
1428
1429 methodHandle LinkResolver::resolve_virtual_call_or_null(
1430 KlassHandle receiver_klass,
1431 const LinkInfo& link_info) {
1432 EXCEPTION_MARK;
1433 CallInfo info;
1434 resolve_virtual_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1435 if (HAS_PENDING_EXCEPTION) {
1436 CLEAR_PENDING_EXCEPTION;
1437 return methodHandle();
1438 }
1439 return info.selected_method();
1440 }
1441
1442 methodHandle LinkResolver::resolve_interface_call_or_null(
1443 KlassHandle receiver_klass,
1444 const LinkInfo& link_info) {
1445 EXCEPTION_MARK;
1446 CallInfo info;
1447 resolve_interface_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1448 if (HAS_PENDING_EXCEPTION) {
1449 CLEAR_PENDING_EXCEPTION;
1450 return methodHandle();
1451 }
1452 return info.selected_method();
1453 }
1454
1455 int LinkResolver::resolve_virtual_vtable_index(KlassHandle receiver_klass,
1456 const LinkInfo& link_info) {
1457 EXCEPTION_MARK;
1458 CallInfo info;
1459 resolve_virtual_call(info, Handle(), receiver_klass, link_info,
1460 /*check_null_or_abstract*/false, THREAD);
1461 if (HAS_PENDING_EXCEPTION) {
1462 CLEAR_PENDING_EXCEPTION;
1463 return Method::invalid_vtable_index;
1464 }
1465 return info.vtable_index();
1466 }
1467
1468 methodHandle LinkResolver::resolve_static_call_or_null(const LinkInfo& link_info) {
1469 EXCEPTION_MARK;
1470 CallInfo info;
1471 resolve_static_call(info, link_info, /*initialize_class*/false, THREAD);
1472 if (HAS_PENDING_EXCEPTION) {
1473 CLEAR_PENDING_EXCEPTION;
1474 return methodHandle();
1475 }
1476 return info.selected_method();
1477 }
1478
1479 methodHandle LinkResolver::resolve_special_call_or_null(const LinkInfo& link_info) {
1480 EXCEPTION_MARK;
1481 CallInfo info;
1482 resolve_special_call(info, link_info, THREAD);
1483 if (HAS_PENDING_EXCEPTION) {
1484 CLEAR_PENDING_EXCEPTION;
1485 return methodHandle();
1486 }
1487 return info.selected_method();
1488 }
1489
1490
1491
1492 //------------------------------------------------------------------------------------------------------------------------
1493 // ConstantPool entries
1494
1495 void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) {
1496 switch (byte) {
1497 case Bytecodes::_invokestatic : resolve_invokestatic (result, pool, index, CHECK); break;
1498 case Bytecodes::_invokespecial : resolve_invokespecial (result, pool, index, CHECK); break;
1499 case Bytecodes::_invokevirtual : resolve_invokevirtual (result, recv, pool, index, CHECK); break;
1500 case Bytecodes::_invokehandle : resolve_invokehandle (result, pool, index, CHECK); break;
1501 case Bytecodes::_invokedynamic : resolve_invokedynamic (result, pool, index, CHECK); break;
1502 case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break;
1503 }
1504 return;
1505 }
1506
1507 void LinkResolver::resolve_invoke(CallInfo& result, Handle& recv,
1508 const methodHandle& attached_method,
1509 Bytecodes::Code byte, TRAPS) {
1510 KlassHandle defc = attached_method->method_holder();
1511 Symbol* name = attached_method->name();
1512 Symbol* type = attached_method->signature();
1513 LinkInfo link_info(defc, name, type, KlassHandle(), LinkInfo::skip_access_check);
1514 switch(byte) {
1515 case Bytecodes::_invokevirtual:
1516 resolve_virtual_call(result, recv, recv->klass(), link_info,
1517 /*check_null_and_abstract=*/true, CHECK);
1518 break;
1519 case Bytecodes::_invokeinterface:
1520 resolve_interface_call(result, recv, recv->klass(), link_info,
1521 /*check_null_and_abstract=*/true, CHECK);
1522 break;
1523 case Bytecodes::_invokestatic:
1524 resolve_static_call(result, link_info, /*initialize_class=*/false, CHECK);
1525 break;
1526 case Bytecodes::_invokespecial:
1527 resolve_special_call(result, link_info, CHECK);
1528 break;
1529 default:
1530 fatal("bad call: %s", Bytecodes::name(byte));
1531 }
1532 }
1533
1534 void LinkResolver::resolve_invokestatic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1535 LinkInfo link_info(pool, index, CHECK);
1536 resolve_static_call(result, link_info, /*initialize_class*/true, CHECK);
1537 }
1538
1539
1540 void LinkResolver::resolve_invokespecial(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1541 LinkInfo link_info(pool, index, CHECK);
1542 resolve_special_call(result, link_info, CHECK);
1543 }
1544
1545
1546 void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv,
1547 const constantPoolHandle& pool, int index,
1548 TRAPS) {
1549
1550 LinkInfo link_info(pool, index, CHECK);
1551 KlassHandle recvrKlass (THREAD, recv.is_null() ? (Klass*)NULL : recv->klass());
1552 resolve_virtual_call(result, recv, recvrKlass, link_info, /*check_null_or_abstract*/true, CHECK);
1553 }
1554
1555
1556 void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, TRAPS) {
1557 LinkInfo link_info(pool, index, CHECK);
1558 KlassHandle recvrKlass (THREAD, recv.is_null() ? (Klass*)NULL : recv->klass());
1559 resolve_interface_call(result, recv, recvrKlass, link_info, true, CHECK);
1560 }
1561
1562
1563 void LinkResolver::resolve_invokehandle(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1564 // This guy is reached from InterpreterRuntime::resolve_invokehandle.
1565 LinkInfo link_info(pool, index, CHECK);
1566 if (TraceMethodHandles) {
1567 ResourceMark rm(THREAD);
1568 tty->print_cr("resolve_invokehandle %s %s", link_info.name()->as_C_string(),
1569 link_info.signature()->as_C_string());
1570 }
1571 resolve_handle_call(result, link_info, CHECK);
1572 }
1573
1574 void LinkResolver::resolve_handle_call(CallInfo& result,
1575 const LinkInfo& link_info,
1576 TRAPS) {
1577 // JSR 292: this must be an implicitly generated method MethodHandle.invokeExact(*...) or similar
1578 assert(link_info.resolved_klass()() == SystemDictionary::MethodHandle_klass(), "");
1579 assert(MethodHandles::is_signature_polymorphic_name(link_info.name()), "");
1580 Handle resolved_appendix;
1581 Handle resolved_method_type;
1582 methodHandle resolved_method = lookup_polymorphic_method(link_info,
1583 &resolved_appendix, &resolved_method_type, CHECK);
1584 result.set_handle(resolved_method, resolved_appendix, resolved_method_type, CHECK);
1585 }
1586
1587 static void wrap_invokedynamic_exception(TRAPS) {
1588 if (HAS_PENDING_EXCEPTION) {
1589 if (TraceMethodHandles) {
1590 tty->print_cr("invokedynamic throws BSME for " INTPTR_FORMAT, p2i((void *)PENDING_EXCEPTION));
1591 PENDING_EXCEPTION->print();
1592 }
1593 if (PENDING_EXCEPTION->is_a(SystemDictionary::BootstrapMethodError_klass())) {
1594 // throw these guys, since they are already wrapped
1595 return;
1596 }
1597 if (!PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1598 // intercept only LinkageErrors which might have failed to wrap
1599 return;
1600 }
1601 // See the "Linking Exceptions" section for the invokedynamic instruction in the JVMS.
1602 Handle nested_exception(THREAD, PENDING_EXCEPTION);
1603 CLEAR_PENDING_EXCEPTION;
1604 THROW_CAUSE(vmSymbols::java_lang_BootstrapMethodError(), nested_exception)
1605 }
1606 }
1607
1608 void LinkResolver::resolve_invokedynamic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1609 Symbol* method_name = pool->name_ref_at(index);
1610 Symbol* method_signature = pool->signature_ref_at(index);
1611 KlassHandle current_klass = KlassHandle(THREAD, pool->pool_holder());
1612
1613 // Resolve the bootstrap specifier (BSM + optional arguments).
1614 Handle bootstrap_specifier;
1615 // Check if CallSite has been bound already:
1616 ConstantPoolCacheEntry* cpce = pool->invokedynamic_cp_cache_entry_at(index);
1617 if (cpce->is_f1_null()) {
1618 int pool_index = cpce->constant_pool_index();
1619 oop bsm_info = pool->resolve_bootstrap_specifier_at(pool_index, THREAD);
1620 wrap_invokedynamic_exception(CHECK);
1621 assert(bsm_info != NULL, "");
1622 // FIXME: Cache this once per BootstrapMethods entry, not once per CONSTANT_InvokeDynamic.
1623 bootstrap_specifier = Handle(THREAD, bsm_info);
1624 }
1625 if (!cpce->is_f1_null()) {
1626 methodHandle method( THREAD, cpce->f1_as_method());
1627 Handle appendix( THREAD, cpce->appendix_if_resolved(pool));
1628 Handle method_type(THREAD, cpce->method_type_if_resolved(pool));
1629 result.set_handle(method, appendix, method_type, THREAD);
1630 wrap_invokedynamic_exception(CHECK);
1631 return;
1632 }
1633
1634 if (TraceMethodHandles) {
1635 ResourceMark rm(THREAD);
1636 tty->print_cr("resolve_invokedynamic #%d %s %s",
1637 ConstantPool::decode_invokedynamic_index(index),
1638 method_name->as_C_string(), method_signature->as_C_string());
1639 tty->print(" BSM info: "); bootstrap_specifier->print();
1640 }
1641
1642 resolve_dynamic_call(result, bootstrap_specifier, method_name, method_signature, current_klass, CHECK);
1643 }
1644
1645 void LinkResolver::resolve_dynamic_call(CallInfo& result,
1646 Handle bootstrap_specifier,
1647 Symbol* method_name, Symbol* method_signature,
1648 KlassHandle current_klass,
1649 TRAPS) {
1650 // JSR 292: this must resolve to an implicitly generated method MH.linkToCallSite(*...)
1651 // The appendix argument is likely to be a freshly-created CallSite.
1652 Handle resolved_appendix;
1653 Handle resolved_method_type;
1654 methodHandle resolved_method =
1655 SystemDictionary::find_dynamic_call_site_invoker(current_klass,
1656 bootstrap_specifier,
1657 method_name, method_signature,
1658 &resolved_appendix,
1659 &resolved_method_type,
1660 THREAD);
1661 wrap_invokedynamic_exception(CHECK);
1662 result.set_handle(resolved_method, resolved_appendix, resolved_method_type, THREAD);
1663 wrap_invokedynamic_exception(CHECK);
1664 }