1 /*
2 * Copyright (c) 1997, 2015, 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/systemDictionary.hpp"
28 #include "classfile/vmSymbols.hpp"
29 #include "compiler/compileBroker.hpp"
30 #include "gc/shared/collectedHeap.inline.hpp"
31 #include "interpreter/bytecode.hpp"
32 #include "interpreter/interpreterRuntime.hpp"
33 #include "interpreter/linkResolver.hpp"
34 #include "logging/log.hpp"
35 #include "memory/resourceArea.hpp"
36 #include "memory/universe.inline.hpp"
37 #include "oops/instanceKlass.hpp"
38 #include "oops/method.hpp"
39 #include "oops/objArrayOop.hpp"
40 #include "oops/oop.inline.hpp"
41 #include "prims/methodHandles.hpp"
42 #include "prims/nativeLookup.hpp"
43 #include "runtime/compilationPolicy.hpp"
44 #include "runtime/fieldDescriptor.hpp"
45 #include "runtime/frame.inline.hpp"
46 #include "runtime/handles.inline.hpp"
47 #include "runtime/reflection.hpp"
48 #include "runtime/signature.hpp"
49 #include "runtime/thread.inline.hpp"
50 #include "runtime/vmThread.hpp"
51
52
53 //------------------------------------------------------------------------------------------------------------------------
54 // Implementation of CallInfo
55
56
57 void CallInfo::set_static(KlassHandle resolved_klass, const methodHandle& resolved_method, TRAPS) {
58 int vtable_index = Method::nonvirtual_vtable_index;
59 set_common(resolved_klass, resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK);
60 }
61
62
63 void CallInfo::set_interface(KlassHandle resolved_klass,
64 KlassHandle selected_klass,
65 const methodHandle& resolved_method,
66 const methodHandle& selected_method,
67 int itable_index, TRAPS) {
68 // This is only called for interface methods. If the resolved_method
69 // comes from java/lang/Object, it can be the subject of a virtual call, so
70 // we should pick the vtable index from the resolved method.
71 // In that case, the caller must call set_virtual instead of set_interface.
72 assert(resolved_method->method_holder()->is_interface(), "");
73 assert(itable_index == resolved_method()->itable_index(), "");
74 set_common(resolved_klass, selected_klass, resolved_method, selected_method, CallInfo::itable_call, itable_index, CHECK);
75 }
76
77 void CallInfo::set_virtual(KlassHandle resolved_klass,
78 KlassHandle selected_klass,
79 const methodHandle& resolved_method,
80 const methodHandle& selected_method,
81 int vtable_index, TRAPS) {
82 assert(vtable_index >= 0 || vtable_index == Method::nonvirtual_vtable_index, "valid index");
83 assert(vtable_index < 0 || !resolved_method->has_vtable_index() || vtable_index == resolved_method->vtable_index(), "");
84 CallKind kind = (vtable_index >= 0 && !resolved_method->can_be_statically_bound() ? CallInfo::vtable_call : CallInfo::direct_call);
85 set_common(resolved_klass, selected_klass, resolved_method, selected_method, kind, vtable_index, CHECK);
86 assert(!resolved_method->is_compiled_lambda_form(), "these must be handled via an invokehandle call");
87 }
88
89 void CallInfo::set_handle(const methodHandle& resolved_method,
90 Handle resolved_appendix,
91 Handle resolved_method_type, TRAPS) {
92 if (resolved_method.is_null()) {
93 THROW_MSG(vmSymbols::java_lang_InternalError(), "resolved method is null");
94 }
95 KlassHandle resolved_klass = SystemDictionary::MethodHandle_klass();
96 assert(resolved_method->intrinsic_id() == vmIntrinsics::_invokeBasic ||
97 resolved_method->is_compiled_lambda_form(),
98 "linkMethod must return one of these");
99 int vtable_index = Method::nonvirtual_vtable_index;
100 assert(!resolved_method->has_vtable_index(), "");
101 set_common(resolved_klass, resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK);
102 _resolved_appendix = resolved_appendix;
103 _resolved_method_type = resolved_method_type;
104 }
105
106 void CallInfo::set_common(KlassHandle resolved_klass,
107 KlassHandle selected_klass,
108 const methodHandle& resolved_method,
109 const methodHandle& selected_method,
110 CallKind kind,
111 int index,
112 TRAPS) {
113 assert(resolved_method->signature() == selected_method->signature(), "signatures must correspond");
114 _resolved_klass = resolved_klass;
115 _selected_klass = selected_klass;
116 _resolved_method = resolved_method;
117 _selected_method = selected_method;
118 _call_kind = kind;
119 _call_index = index;
120 _resolved_appendix = Handle();
121 DEBUG_ONLY(verify()); // verify before making side effects
122
123 if (CompilationPolicy::must_be_compiled(selected_method)) {
124 // This path is unusual, mostly used by the '-Xcomp' stress test mode.
125
126 // Note: with several active threads, the must_be_compiled may be true
127 // while can_be_compiled is false; remove assert
128 // assert(CompilationPolicy::can_be_compiled(selected_method), "cannot compile");
129 if (!THREAD->can_call_java()) {
130 // don't force compilation, resolve was on behalf of compiler
131 return;
132 }
133 if (selected_method->method_holder()->is_not_initialized()) {
134 // 'is_not_initialized' means not only '!is_initialized', but also that
135 // initialization has not been started yet ('!being_initialized')
136 // Do not force compilation of methods in uninitialized classes.
137 // Note that doing this would throw an assert later,
138 // in CompileBroker::compile_method.
139 // We sometimes use the link resolver to do reflective lookups
140 // even before classes are initialized.
141 return;
142 }
143 CompileBroker::compile_method(selected_method, InvocationEntryBci,
144 CompilationPolicy::policy()->initial_compile_level(),
145 methodHandle(), 0, "must_be_compiled", CHECK);
146 }
147 }
148
149 // utility query for unreflecting a method
150 CallInfo::CallInfo(Method* resolved_method, Klass* resolved_klass) {
151 Klass* resolved_method_holder = resolved_method->method_holder();
152 if (resolved_klass == NULL) { // 2nd argument defaults to holder of 1st
153 resolved_klass = resolved_method_holder;
154 }
155 _resolved_klass = resolved_klass;
156 _selected_klass = resolved_klass;
157 _resolved_method = resolved_method;
158 _selected_method = resolved_method;
159 // classify:
160 CallKind kind = CallInfo::unknown_kind;
161 int index = resolved_method->vtable_index();
162 if (resolved_method->can_be_statically_bound()) {
163 kind = CallInfo::direct_call;
164 } else if (!resolved_method_holder->is_interface()) {
165 // Could be an Object method inherited into an interface, but still a vtable call.
166 kind = CallInfo::vtable_call;
167 } else if (!resolved_klass->is_interface()) {
168 // A default or miranda method. Compute the vtable index.
169 ResourceMark rm;
170 klassVtable* vt = InstanceKlass::cast(resolved_klass)->vtable();
171 index = LinkResolver::vtable_index_of_interface_method(resolved_klass,
172 resolved_method);
173 assert(index >= 0 , "we should have valid vtable index at this point");
174
175 kind = CallInfo::vtable_call;
176 } else if (resolved_method->has_vtable_index()) {
177 // Can occur if an interface redeclares a method of Object.
178
179 #ifdef ASSERT
180 // Ensure that this is really the case.
181 KlassHandle object_klass = SystemDictionary::Object_klass();
182 Method * object_resolved_method = object_klass()->vtable()->method_at(index);
183 assert(object_resolved_method->name() == resolved_method->name(),
184 "Object and interface method names should match at vtable index %d, %s != %s",
185 index, object_resolved_method->name()->as_C_string(), resolved_method->name()->as_C_string());
186 assert(object_resolved_method->signature() == resolved_method->signature(),
187 "Object and interface method signatures should match at vtable index %d, %s != %s",
188 index, object_resolved_method->signature()->as_C_string(), resolved_method->signature()->as_C_string());
189 #endif // ASSERT
190
191 kind = CallInfo::vtable_call;
192 } else {
193 // A regular interface call.
194 kind = CallInfo::itable_call;
195 index = resolved_method->itable_index();
196 }
197 assert(index == Method::nonvirtual_vtable_index || index >= 0, "bad index %d", index);
198 _call_kind = kind;
199 _call_index = index;
200 _resolved_appendix = Handle();
201 DEBUG_ONLY(verify());
202 }
203
204 #ifdef ASSERT
205 void CallInfo::verify() {
206 switch (call_kind()) { // the meaning and allowed value of index depends on kind
207 case CallInfo::direct_call:
208 if (_call_index == Method::nonvirtual_vtable_index) break;
209 // else fall through to check vtable index:
210 case CallInfo::vtable_call:
211 assert(resolved_klass()->verify_vtable_index(_call_index), "");
212 break;
213 case CallInfo::itable_call:
214 assert(resolved_method()->method_holder()->verify_itable_index(_call_index), "");
215 break;
216 case CallInfo::unknown_kind:
217 assert(call_kind() != CallInfo::unknown_kind, "CallInfo must be set");
218 break;
219 default:
220 fatal("Unexpected call kind %d", call_kind());
221 }
222 }
223 #endif //ASSERT
224
225 #ifndef PRODUCT
226 void CallInfo::print() {
227 ResourceMark rm;
228 const char* kindstr = "unknown";
229 switch (_call_kind) {
230 case direct_call: kindstr = "direct"; break;
231 case vtable_call: kindstr = "vtable"; break;
232 case itable_call: kindstr = "itable"; break;
233 }
234 tty->print_cr("Call %s@%d %s", kindstr, _call_index,
235 _resolved_method.is_null() ? "(none)" : _resolved_method->name_and_sig_as_C_string());
236 }
237 #endif
238
239 //------------------------------------------------------------------------------------------------------------------------
240 // Implementation of LinkInfo
241
242 LinkInfo::LinkInfo(const constantPoolHandle& pool, int index, TRAPS) {
243 // resolve klass
244 Klass* result = pool->klass_ref_at(index, CHECK);
245 _resolved_klass = KlassHandle(THREAD, result);
246
247 // Get name, signature, and static klass
248 _name = pool->name_ref_at(index);
249 _signature = pool->signature_ref_at(index);
250 _current_klass = KlassHandle(THREAD, pool->pool_holder());
251
252 // Coming from the constant pool always checks access
253 _check_access = true;
254 }
255
256 char* LinkInfo::method_string() const {
257 return Method::name_and_sig_as_C_string(_resolved_klass(), _name, _signature);
258 }
259
260 #ifndef PRODUCT
261 void LinkInfo::print() {
262 ResourceMark rm;
263 tty->print_cr("Link resolved_klass=%s name=%s signature=%s current_klass=%s check_access=%s",
264 _resolved_klass->name()->as_C_string(),
265 _name->as_C_string(),
266 _signature->as_C_string(),
267 _current_klass.is_null() ? "(none)" : _current_klass->name()->as_C_string(),
268 _check_access ? "true" : "false");
269 }
270 #endif // PRODUCT
271 //------------------------------------------------------------------------------------------------------------------------
272 // Klass resolution
273
274 void LinkResolver::check_klass_accessability(KlassHandle ref_klass, KlassHandle sel_klass, TRAPS) {
275 if (!Reflection::verify_class_access(ref_klass(),
276 sel_klass(),
277 true)) {
278 ResourceMark rm(THREAD);
279 Exceptions::fthrow(
280 THREAD_AND_LOCATION,
281 vmSymbols::java_lang_IllegalAccessError(),
282 "tried to access class %s from class %s",
283 sel_klass->external_name(),
284 ref_klass->external_name()
285 );
286 return;
287 }
288 }
289
290 //------------------------------------------------------------------------------------------------------------------------
291 // Method resolution
292 //
293 // According to JVM spec. $5.4.3c & $5.4.3d
294
295 // Look up method in klasses, including static methods
296 // Then look up local default methods
297 methodHandle LinkResolver::lookup_method_in_klasses(const LinkInfo& link_info,
298 bool checkpolymorphism,
299 bool in_imethod_resolve, TRAPS) {
300 KlassHandle klass = link_info.resolved_klass();
301 Symbol* name = link_info.name();
302 Symbol* signature = link_info.signature();
303
304 // Ignore overpasses so statics can be found during resolution
305 Method* result = klass->uncached_lookup_method(name, signature, Klass::skip_overpass);
306
307 if (klass->is_array_klass()) {
308 // Only consider klass and super klass for arrays
309 return methodHandle(THREAD, result);
310 }
311
312 InstanceKlass* ik = InstanceKlass::cast(klass());
313
314 // JDK 8, JVMS 5.4.3.4: Interface method resolution should
315 // ignore static and non-public methods of java.lang.Object,
316 // like clone, finalize, registerNatives.
317 if (in_imethod_resolve &&
318 result != NULL &&
319 ik->is_interface() &&
320 (result->is_static() || !result->is_public()) &&
321 result->method_holder() == SystemDictionary::Object_klass()) {
322 result = NULL;
323 }
324
325 // Before considering default methods, check for an overpass in the
326 // current class if a method has not been found.
327 if (result == NULL) {
328 result = ik->find_method(name, signature);
329 }
330
331 if (result == NULL) {
332 Array<Method*>* default_methods = ik->default_methods();
333 if (default_methods != NULL) {
334 result = InstanceKlass::find_method(default_methods, name, signature);
335 }
336 }
337
338 if (checkpolymorphism && result != NULL) {
339 vmIntrinsics::ID iid = result->intrinsic_id();
340 if (MethodHandles::is_signature_polymorphic(iid)) {
341 // Do not link directly to these. The VM must produce a synthetic one using lookup_polymorphic_method.
342 return NULL;
343 }
344 }
345 return methodHandle(THREAD, result);
346 }
347
348 // returns first instance method
349 // Looks up method in classes, then looks up local default methods
350 methodHandle LinkResolver::lookup_instance_method_in_klasses(KlassHandle klass,
351 Symbol* name,
352 Symbol* signature, TRAPS) {
353 Method* result = klass->uncached_lookup_method(name, signature, Klass::find_overpass);
354
355 while (result != NULL && result->is_static() && result->method_holder()->super() != NULL) {
356 Klass* super_klass = result->method_holder()->super();
357 result = super_klass->uncached_lookup_method(name, signature, Klass::find_overpass);
358 }
359
360 if (klass->is_array_klass()) {
361 // Only consider klass and super klass for arrays
362 return methodHandle(THREAD, result);
363 }
364
365 if (result == NULL) {
366 Array<Method*>* default_methods = InstanceKlass::cast(klass())->default_methods();
367 if (default_methods != NULL) {
368 result = InstanceKlass::find_method(default_methods, name, signature);
369 assert(result == NULL || !result->is_static(), "static defaults not allowed");
370 }
371 }
372 return methodHandle(THREAD, result);
373 }
374
375 int LinkResolver::vtable_index_of_interface_method(KlassHandle klass,
376 const methodHandle& resolved_method) {
377
378 int vtable_index = Method::invalid_vtable_index;
379 Symbol* name = resolved_method->name();
380 Symbol* signature = resolved_method->signature();
381 InstanceKlass* ik = InstanceKlass::cast(klass());
382
383 // First check in default method array
384 if (!resolved_method->is_abstract() && ik->default_methods() != NULL) {
385 int index = InstanceKlass::find_method_index(ik->default_methods(),
386 name, signature, Klass::find_overpass,
387 Klass::find_static, Klass::find_private);
388 if (index >= 0 ) {
389 vtable_index = ik->default_vtable_indices()->at(index);
390 }
391 }
392 if (vtable_index == Method::invalid_vtable_index) {
393 // get vtable_index for miranda methods
394 ResourceMark rm;
395 klassVtable *vt = ik->vtable();
396 vtable_index = vt->index_of_miranda(name, signature);
397 }
398 return vtable_index;
399 }
400
401 methodHandle LinkResolver::lookup_method_in_interfaces(const LinkInfo& cp_info, TRAPS) {
402 InstanceKlass *ik = InstanceKlass::cast(cp_info.resolved_klass()());
403
404 // Specify 'true' in order to skip default methods when searching the
405 // interfaces. Function lookup_method_in_klasses() already looked for
406 // the method in the default methods table.
407 return methodHandle(THREAD,
408 ik->lookup_method_in_all_interfaces(cp_info.name(), cp_info.signature(),
409 Klass::skip_defaults));
410 }
411
412 methodHandle LinkResolver::lookup_polymorphic_method(
413 const LinkInfo& link_info,
414 Handle *appendix_result_or_null,
415 Handle *method_type_result,
416 TRAPS) {
417 KlassHandle klass = link_info.resolved_klass();
418 Symbol* name = link_info.name();
419 Symbol* full_signature = link_info.signature();
420
421 vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name);
422 if (TraceMethodHandles) {
423 ResourceMark rm(THREAD);
424 tty->print_cr("lookup_polymorphic_method iid=%s %s.%s%s",
425 vmIntrinsics::name_at(iid), klass->external_name(),
426 name->as_C_string(), full_signature->as_C_string());
427 }
428 if (klass() == SystemDictionary::MethodHandle_klass() &&
429 iid != vmIntrinsics::_none) {
430 if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) {
431 // Most of these do not need an up-call to Java to resolve, so can be done anywhere.
432 // Do not erase last argument type (MemberName) if it is a static linkTo method.
433 bool keep_last_arg = MethodHandles::is_signature_polymorphic_static(iid);
434 TempNewSymbol basic_signature =
435 MethodHandles::lookup_basic_type_signature(full_signature, keep_last_arg, CHECK_NULL);
436 if (TraceMethodHandles) {
437 ResourceMark rm(THREAD);
438 tty->print_cr("lookup_polymorphic_method %s %s => basic %s",
439 name->as_C_string(),
440 full_signature->as_C_string(),
441 basic_signature->as_C_string());
442 }
443 methodHandle result = SystemDictionary::find_method_handle_intrinsic(iid,
444 basic_signature,
445 CHECK_NULL);
446 if (result.not_null()) {
447 assert(result->is_method_handle_intrinsic(), "MH.invokeBasic or MH.linkTo* intrinsic");
448 assert(result->intrinsic_id() != vmIntrinsics::_invokeGeneric, "wrong place to find this");
449 assert(basic_signature == result->signature(), "predict the result signature");
450 if (TraceMethodHandles) {
451 tty->print("lookup_polymorphic_method => intrinsic ");
452 result->print_on(tty);
453 }
454 }
455 return result;
456 } else if (iid == vmIntrinsics::_invokeGeneric
457 && THREAD->can_call_java()
458 && appendix_result_or_null != NULL) {
459 // This is a method with type-checking semantics.
460 // We will ask Java code to spin an adapter method for it.
461 if (!MethodHandles::enabled()) {
462 // Make sure the Java part of the runtime has been booted up.
463 Klass* natives = SystemDictionary::MethodHandleNatives_klass();
464 if (natives == NULL || InstanceKlass::cast(natives)->is_not_initialized()) {
465 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_invoke_MethodHandleNatives(),
466 Handle(),
467 Handle(),
468 true,
469 CHECK_NULL);
470 }
471 }
472
473 Handle appendix;
474 Handle method_type;
475 methodHandle result = SystemDictionary::find_method_handle_invoker(
476 name,
477 full_signature,
478 link_info.current_klass(),
479 &appendix,
480 &method_type,
481 CHECK_NULL);
482 if (TraceMethodHandles) {
483 tty->print("lookup_polymorphic_method => (via Java) ");
484 result->print_on(tty);
485 tty->print(" lookup_polymorphic_method => appendix = ");
486 if (appendix.is_null()) tty->print_cr("(none)");
487 else appendix->print_on(tty);
488 }
489 if (result.not_null()) {
490 #ifdef ASSERT
491 ResourceMark rm(THREAD);
492
493 TempNewSymbol basic_signature =
494 MethodHandles::lookup_basic_type_signature(full_signature, CHECK_NULL);
495 int actual_size_of_params = result->size_of_parameters();
496 int expected_size_of_params = ArgumentSizeComputer(basic_signature).size();
497 // +1 for MethodHandle.this, +1 for trailing MethodType
498 if (!MethodHandles::is_signature_polymorphic_static(iid)) expected_size_of_params += 1;
499 if (appendix.not_null()) expected_size_of_params += 1;
500 if (actual_size_of_params != expected_size_of_params) {
501 tty->print_cr("*** basic_signature=%s", basic_signature->as_C_string());
502 tty->print_cr("*** result for %s: ", vmIntrinsics::name_at(iid));
503 result->print();
504 }
505 assert(actual_size_of_params == expected_size_of_params,
506 "%d != %d", actual_size_of_params, expected_size_of_params);
507 #endif //ASSERT
508
509 assert(appendix_result_or_null != NULL, "");
510 (*appendix_result_or_null) = appendix;
511 (*method_type_result) = method_type;
512 }
513 return result;
514 }
515 }
516 return NULL;
517 }
518
519 void LinkResolver::check_method_accessability(KlassHandle ref_klass,
520 KlassHandle resolved_klass,
521 KlassHandle sel_klass,
522 const methodHandle& sel_method,
523 TRAPS) {
524
525 AccessFlags flags = sel_method->access_flags();
526
527 // Special case: arrays always override "clone". JVMS 2.15.
528 // If the resolved klass is an array class, and the declaring class
529 // is java.lang.Object and the method is "clone", set the flags
530 // to public.
531 //
532 // We'll check for the method name first, as that's most likely
533 // to be false (so we'll short-circuit out of these tests).
534 if (sel_method->name() == vmSymbols::clone_name() &&
535 sel_klass() == SystemDictionary::Object_klass() &&
536 resolved_klass->is_array_klass()) {
537 // We need to change "protected" to "public".
538 assert(flags.is_protected(), "clone not protected?");
539 jint new_flags = flags.as_int();
540 new_flags = new_flags & (~JVM_ACC_PROTECTED);
541 new_flags = new_flags | JVM_ACC_PUBLIC;
542 flags.set_flags(new_flags);
543 }
544 // assert(extra_arg_result_or_null != NULL, "must be able to return extra argument");
545
546 if (!Reflection::verify_field_access(ref_klass(),
547 resolved_klass(),
548 sel_klass(),
549 flags,
550 true)) {
551 ResourceMark rm(THREAD);
552 Exceptions::fthrow(
553 THREAD_AND_LOCATION,
554 vmSymbols::java_lang_IllegalAccessError(),
555 "tried to access method %s.%s%s from class %s",
556 sel_klass->external_name(),
557 sel_method->name()->as_C_string(),
558 sel_method->signature()->as_C_string(),
559 ref_klass->external_name()
560 );
561 return;
562 }
563 }
564
565 methodHandle LinkResolver::resolve_method_statically(Bytecodes::Code code,
566 const constantPoolHandle& pool, int index, TRAPS) {
567 // This method is used only
568 // (1) in C2 from InlineTree::ok_to_inline (via ciMethod::check_call),
569 // and
570 // (2) in Bytecode_invoke::static_target
571 // It appears to fail when applied to an invokeinterface call site.
572 // FIXME: Remove this method and ciMethod::check_call; refactor to use the other LinkResolver entry points.
573 // resolve klass
574 KlassHandle resolved_klass;
575 if (code == Bytecodes::_invokedynamic) {
576 resolved_klass = SystemDictionary::MethodHandle_klass();
577 Symbol* method_name = vmSymbols::invoke_name();
578 Symbol* method_signature = pool->signature_ref_at(index);
579 KlassHandle current_klass(THREAD, pool->pool_holder());
580 LinkInfo link_info(resolved_klass, method_name, method_signature, current_klass);
581 return resolve_method(link_info, /*require_methodref*/false, THREAD);
582 }
583
584 LinkInfo link_info(pool, index, CHECK_NULL);
585 resolved_klass = link_info.resolved_klass();
586
587 if (pool->has_preresolution()
588 || (resolved_klass() == SystemDictionary::MethodHandle_klass() &&
589 MethodHandles::is_signature_polymorphic_name(resolved_klass(), link_info.name()))) {
590 Method* result = ConstantPool::method_at_if_loaded(pool, index);
591 if (result != NULL) {
592 return methodHandle(THREAD, result);
593 }
594 }
595
596 if (code == Bytecodes::_invokeinterface) {
597 return resolve_interface_method(link_info, true, THREAD);
598 } else if (code == Bytecodes::_invokevirtual) {
599 return resolve_method(link_info, /*require_methodref*/true, THREAD);
600 } else if (!resolved_klass->is_interface()) {
601 return resolve_method(link_info, /*require_methodref*/false, THREAD);
602 } else {
603 bool nostatics = (code == Bytecodes::_invokestatic) ? false : true;
604 return resolve_interface_method(link_info, nostatics, THREAD);
605 }
606 }
607
608 // Check and print a loader constraint violation message for method or interface method
609 void LinkResolver::check_method_loader_constraints(const LinkInfo& link_info,
610 const methodHandle& resolved_method,
611 const char* method_type, TRAPS) {
612 Handle current_loader(THREAD, link_info.current_klass()->class_loader());
613 Handle resolved_loader(THREAD, resolved_method->method_holder()->class_loader());
614
615 ResourceMark rm(THREAD);
616 Symbol* failed_type_symbol =
617 SystemDictionary::check_signature_loaders(link_info.signature(), current_loader,
618 resolved_loader, true, CHECK);
619 if (failed_type_symbol != NULL) {
620 const char* msg = "loader constraint violation: when resolving %s"
621 " \"%s\" the class loader (instance of %s) of the current class, %s,"
622 " and the class loader (instance of %s) for the method's defining class, %s, have"
623 " different Class objects for the type %s used in the signature";
624 char* sig = link_info.method_string();
625 const char* loader1_name = SystemDictionary::loader_name(current_loader());
626 char* current = link_info.current_klass()->name()->as_C_string();
627 const char* loader2_name = SystemDictionary::loader_name(resolved_loader());
628 char* target = resolved_method->method_holder()->name()->as_C_string();
629 char* failed_type_name = failed_type_symbol->as_C_string();
630 size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1_name) +
631 strlen(current) + strlen(loader2_name) + strlen(target) +
632 strlen(failed_type_name) + strlen(method_type) + 1;
633 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen);
634 jio_snprintf(buf, buflen, msg, method_type, sig, loader1_name, current, loader2_name,
635 target, failed_type_name);
636 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf);
637 }
638 }
639
640 void LinkResolver::check_field_loader_constraints(Symbol* field, Symbol* sig,
641 KlassHandle current_klass,
642 KlassHandle sel_klass, TRAPS) {
643 Handle ref_loader(THREAD, current_klass->class_loader());
644 Handle sel_loader(THREAD, sel_klass->class_loader());
645
646 ResourceMark rm(THREAD); // needed for check_signature_loaders
647 Symbol* failed_type_symbol =
648 SystemDictionary::check_signature_loaders(sig,
649 ref_loader, sel_loader,
650 false,
651 CHECK);
652 if (failed_type_symbol != NULL) {
653 const char* msg = "loader constraint violation: when resolving field"
654 " \"%s\" the class loader (instance of %s) of the referring class, "
655 "%s, and the class loader (instance of %s) for the field's resolved "
656 "type, %s, have different Class objects for that type";
657 char* field_name = field->as_C_string();
658 const char* loader1_name = SystemDictionary::loader_name(ref_loader());
659 char* sel = sel_klass->name()->as_C_string();
660 const char* loader2_name = SystemDictionary::loader_name(sel_loader());
661 char* failed_type_name = failed_type_symbol->as_C_string();
662 size_t buflen = strlen(msg) + strlen(field_name) + strlen(loader1_name) +
663 strlen(sel) + strlen(loader2_name) + strlen(failed_type_name) + 1;
664 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen);
665 jio_snprintf(buf, buflen, msg, field_name, loader1_name, sel, loader2_name,
666 failed_type_name);
667 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf);
668 }
669 }
670
671 methodHandle LinkResolver::resolve_method(const LinkInfo& link_info,
672 bool require_methodref, TRAPS) {
673
674 Handle nested_exception;
675 KlassHandle resolved_klass = link_info.resolved_klass();
676
677 // 1. check if methodref required, that resolved_klass is not interfacemethodref
678 if (require_methodref && resolved_klass->is_interface()) {
679 ResourceMark rm(THREAD);
680 char buf[200];
681 jio_snprintf(buf, sizeof(buf), "Found interface %s, but class was expected",
682 resolved_klass()->external_name());
683 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
684 }
685
686 // 2. lookup method in resolved klass and its super klasses
687 methodHandle resolved_method = lookup_method_in_klasses(link_info, true, false, CHECK_NULL);
688
689 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) { // not found in the class hierarchy
690 // 3. lookup method in all the interfaces implemented by the resolved klass
691 resolved_method = lookup_method_in_interfaces(link_info, CHECK_NULL);
692
693 if (resolved_method.is_null()) {
694 // JSR 292: see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc
695 resolved_method = lookup_polymorphic_method(link_info, (Handle*)NULL, (Handle*)NULL, THREAD);
696 if (HAS_PENDING_EXCEPTION) {
697 nested_exception = Handle(THREAD, PENDING_EXCEPTION);
698 CLEAR_PENDING_EXCEPTION;
699 }
700 }
701 }
702
703 if (resolved_method.is_null()) {
704 // 4. method lookup failed
705 ResourceMark rm(THREAD);
706 THROW_MSG_CAUSE_(vmSymbols::java_lang_NoSuchMethodError(),
707 Method::name_and_sig_as_C_string(resolved_klass(),
708 link_info.name(),
709 link_info.signature()),
710 nested_exception, NULL);
711 }
712
713 // 5. access checks, access checking may be turned off when calling from within the VM.
714 KlassHandle current_klass = link_info.current_klass();
715 if (link_info.check_access()) {
716 assert(current_klass.not_null() , "current_klass should not be null");
717
718 // check if method can be accessed by the referring class
719 check_method_accessability(current_klass,
720 resolved_klass,
721 KlassHandle(THREAD, resolved_method->method_holder()),
722 resolved_method,
723 CHECK_NULL);
724
725 // check loader constraints
726 check_method_loader_constraints(link_info, resolved_method, "method", CHECK_NULL);
727 }
728
729 return resolved_method;
730 }
731
732 static void trace_method_resolution(const char* prefix,
733 KlassHandle klass,
734 KlassHandle resolved_klass,
735 const methodHandle& method,
736 bool logitables,
737 int index = -1) {
738 #ifndef PRODUCT
739 ResourceMark rm;
740 outputStream* st;
741 if (logitables) {
742 st = LogHandle(itables)::trace_stream();
743 } else {
744 st = LogHandle(vtables)::trace_stream();
745 }
746 st->print("%s%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ",
747 prefix,
748 (klass.is_null() ? "<NULL>" : klass->internal_name()),
749 (resolved_klass.is_null() ? "<NULL>" : resolved_klass->internal_name()),
750 Method::name_and_sig_as_C_string(resolved_klass(),
751 method->name(),
752 method->signature()),
753 method->method_holder()->internal_name());
754 method->print_linkage_flags(st);
755 if (index != -1) {
756 st->print("vtable_index:%d", index);
757 }
758 st->cr();
759 #endif // PRODUCT
760 }
761
762 methodHandle LinkResolver::resolve_interface_method(const LinkInfo& link_info,
763 bool nostatics, TRAPS) {
764
765 KlassHandle resolved_klass = link_info.resolved_klass();
766
767 // check if klass is interface
768 if (!resolved_klass->is_interface()) {
769 ResourceMark rm(THREAD);
770 char buf[200];
771 jio_snprintf(buf, sizeof(buf), "Found class %s, but interface was expected", resolved_klass()->external_name());
772 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
773 }
774
775 // lookup method in this interface or its super, java.lang.Object
776 // JDK8: also look for static methods
777 methodHandle resolved_method = lookup_method_in_klasses(link_info, false, true, CHECK_NULL);
778
779 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) {
780 // lookup method in all the super-interfaces
781 resolved_method = lookup_method_in_interfaces(link_info, CHECK_NULL);
782 }
783
784 if (resolved_method.is_null()) {
785 // no method found
786 ResourceMark rm(THREAD);
787 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(),
788 Method::name_and_sig_as_C_string(resolved_klass(),
789 link_info.name(),
790 link_info.signature()));
791 }
792
793 if (link_info.check_access()) {
794 // JDK8 adds non-public interface methods, and accessability check requirement
795 KlassHandle current_klass = link_info.current_klass();
796
797 assert(current_klass.not_null() , "current_klass should not be null");
798
799 // check if method can be accessed by the referring class
800 check_method_accessability(current_klass,
801 resolved_klass,
802 KlassHandle(THREAD, resolved_method->method_holder()),
803 resolved_method,
804 CHECK_NULL);
805
806 check_method_loader_constraints(link_info, resolved_method, "interface method", CHECK_NULL);
807 }
808
809 if (nostatics && resolved_method->is_static()) {
810 ResourceMark rm(THREAD);
811 char buf[200];
812 jio_snprintf(buf, sizeof(buf), "Expected instance not static method %s",
813 Method::name_and_sig_as_C_string(resolved_klass(),
814 resolved_method->name(), resolved_method->signature()));
815 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
816 }
817
818 if (develop_log_is_enabled(Trace, itables)) {
819 trace_method_resolution("invokeinterface resolved method: caller-class",
820 link_info.current_klass(), resolved_klass,
821 resolved_method, true);
822 }
823
824 return resolved_method;
825 }
826
827 //------------------------------------------------------------------------------------------------------------------------
828 // Field resolution
829
830 void LinkResolver::check_field_accessability(KlassHandle ref_klass,
831 KlassHandle resolved_klass,
832 KlassHandle sel_klass,
833 const fieldDescriptor& fd,
834 TRAPS) {
835 if (!Reflection::verify_field_access(ref_klass(),
836 resolved_klass(),
837 sel_klass(),
838 fd.access_flags(),
839 true)) {
840 ResourceMark rm(THREAD);
841 Exceptions::fthrow(
842 THREAD_AND_LOCATION,
843 vmSymbols::java_lang_IllegalAccessError(),
844 "tried to access field %s.%s from class %s",
845 sel_klass->external_name(),
846 fd.name()->as_C_string(),
847 ref_klass->external_name()
848 );
849 return;
850 }
851 }
852
853 void LinkResolver::resolve_field_access(fieldDescriptor& fd, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) {
854 LinkInfo link_info(pool, index, CHECK);
855 resolve_field(fd, link_info, byte, true, CHECK);
856 }
857
858 void LinkResolver::resolve_field(fieldDescriptor& fd,
859 const LinkInfo& link_info,
860 Bytecodes::Code byte, bool initialize_class,
861 TRAPS) {
862 assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic ||
863 byte == Bytecodes::_getfield || byte == Bytecodes::_putfield ||
864 byte == Bytecodes::_nofast_getfield || byte == Bytecodes::_nofast_putfield ||
865 (byte == Bytecodes::_nop && !link_info.check_access()), "bad field access bytecode");
866
867 bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic);
868 bool is_put = (byte == Bytecodes::_putfield || byte == Bytecodes::_putstatic || byte == Bytecodes::_nofast_putfield);
869 // Check if there's a resolved klass containing the field
870 KlassHandle resolved_klass = link_info.resolved_klass();
871 Symbol* field = link_info.name();
872 Symbol* sig = link_info.signature();
873
874 if (resolved_klass.is_null()) {
875 ResourceMark rm(THREAD);
876 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
877 }
878
879 // Resolve instance field
880 KlassHandle sel_klass(THREAD, resolved_klass->find_field(field, sig, &fd));
881 // check if field exists; i.e., if a klass containing the field def has been selected
882 if (sel_klass.is_null()) {
883 ResourceMark rm(THREAD);
884 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
885 }
886
887 if (!link_info.check_access())
888 // Access checking may be turned off when calling from within the VM.
889 return;
890
891 // check access
892 KlassHandle current_klass = link_info.current_klass();
893 check_field_accessability(current_klass, resolved_klass, sel_klass, fd, CHECK);
894
895 // check for errors
896 if (is_static != fd.is_static()) {
897 ResourceMark rm(THREAD);
898 char msg[200];
899 jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", resolved_klass()->external_name(), fd.name()->as_C_string());
900 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg);
901 }
902
903 // Final fields can only be accessed from its own class.
904 if (is_put && fd.access_flags().is_final() && sel_klass() != current_klass()) {
905 THROW(vmSymbols::java_lang_IllegalAccessError());
906 }
907
908 // initialize resolved_klass if necessary
909 // note 1: the klass which declared the field must be initialized (i.e, sel_klass)
910 // according to the newest JVM spec (5.5, p.170) - was bug (gri 7/28/99)
911 //
912 // note 2: we don't want to force initialization if we are just checking
913 // if the field access is legal; e.g., during compilation
914 if (is_static && initialize_class) {
915 sel_klass->initialize(CHECK);
916 }
917
918 if (sel_klass() != current_klass()) {
919 check_field_loader_constraints(field, sig, current_klass, sel_klass, CHECK);
920 }
921
922 // return information. note that the klass is set to the actual klass containing the
923 // field, otherwise access of static fields in superclasses will not work.
924 }
925
926
927 //------------------------------------------------------------------------------------------------------------------------
928 // Invoke resolution
929 //
930 // Naming conventions:
931 //
932 // resolved_method the specified method (i.e., static receiver specified via constant pool index)
933 // sel_method the selected method (selected via run-time lookup; e.g., based on dynamic receiver class)
934 // resolved_klass the specified klass (i.e., specified via constant pool index)
935 // recv_klass the receiver klass
936
937
938 void LinkResolver::resolve_static_call(CallInfo& result,
939 const LinkInfo& link_info,
940 bool initialize_class, TRAPS) {
941 methodHandle resolved_method = linktime_resolve_static_method(link_info, CHECK);
942
943 // The resolved class can change as a result of this resolution.
944 KlassHandle resolved_klass = KlassHandle(THREAD, resolved_method->method_holder());
945
946 Method* save_resolved_method = resolved_method();
947 // Initialize klass (this should only happen if everything is ok)
948 if (initialize_class && resolved_klass->should_be_initialized()) {
949 resolved_klass->initialize(CHECK);
950 // Use updated LinkInfo (to reresolve with resolved_klass as method_holder?)
951 LinkInfo new_info(resolved_klass, link_info.name(), link_info.signature(),
952 link_info.current_klass(), link_info.check_access());
953 resolved_method = linktime_resolve_static_method(new_info, CHECK);
954 }
955
956 assert(save_resolved_method == resolved_method(), "does this change?");
957 // setup result
958 result.set_static(resolved_klass, resolved_method, CHECK);
959 }
960
961 // throws linktime exceptions
962 methodHandle LinkResolver::linktime_resolve_static_method(const LinkInfo& link_info, TRAPS) {
963
964 KlassHandle resolved_klass = link_info.resolved_klass();
965 methodHandle resolved_method;
966 if (!resolved_klass->is_interface()) {
967 resolved_method = resolve_method(link_info, /*require_methodref*/false, CHECK_NULL);
968 } else {
969 resolved_method = resolve_interface_method(link_info, /*nostatics*/false, CHECK_NULL);
970 }
971 assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier");
972
973 // check if static
974 if (!resolved_method->is_static()) {
975 ResourceMark rm(THREAD);
976 char buf[200];
977 jio_snprintf(buf, sizeof(buf), "Expected static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
978 resolved_method->name(),
979 resolved_method->signature()));
980 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
981 }
982 return resolved_method;
983 }
984
985
986 void LinkResolver::resolve_special_call(CallInfo& result,
987 const LinkInfo& link_info,
988 TRAPS) {
989 methodHandle resolved_method = linktime_resolve_special_method(link_info, CHECK);
990 runtime_resolve_special_method(result, resolved_method,
991 link_info.resolved_klass(),
992 link_info.current_klass(),
993 link_info.check_access(), CHECK);
994 }
995
996 // throws linktime exceptions
997 methodHandle LinkResolver::linktime_resolve_special_method(const LinkInfo& link_info,
998 TRAPS) {
999
1000 // Invokespecial is called for multiple special reasons:
1001 // <init>
1002 // local private method invocation, for classes and interfaces
1003 // superclass.method, which can also resolve to a default method
1004 // and the selected method is recalculated relative to the direct superclass
1005 // superinterface.method, which explicitly does not check shadowing
1006 KlassHandle resolved_klass = link_info.resolved_klass();
1007 methodHandle resolved_method;
1008
1009 if (!resolved_klass->is_interface()) {
1010 resolved_method = resolve_method(link_info, /*require_methodref*/false, CHECK_NULL);
1011 } else {
1012 resolved_method = resolve_interface_method(link_info, /*nostatics*/true, CHECK_NULL);
1013 }
1014
1015 // check if method name is <init>, that it is found in same klass as static type
1016 if (resolved_method->name() == vmSymbols::object_initializer_name() &&
1017 resolved_method->method_holder() != resolved_klass()) {
1018 ResourceMark rm(THREAD);
1019 Exceptions::fthrow(
1020 THREAD_AND_LOCATION,
1021 vmSymbols::java_lang_NoSuchMethodError(),
1022 "%s: method %s%s not found",
1023 resolved_klass->external_name(),
1024 resolved_method->name()->as_C_string(),
1025 resolved_method->signature()->as_C_string()
1026 );
1027 return NULL;
1028 }
1029
1030 // check if invokespecial's interface method reference is in an indirect superinterface
1031 KlassHandle current_klass = link_info.current_klass();
1032 if (!current_klass.is_null() && resolved_klass->is_interface()) {
1033 Klass *klass_to_check = !InstanceKlass::cast(current_klass())->is_anonymous() ?
1034 current_klass() :
1035 InstanceKlass::cast(current_klass())->host_klass();
1036 // Disable verification for the dynamically-generated reflection bytecodes.
1037 bool is_reflect = klass_to_check->is_subclass_of(
1038 SystemDictionary::reflect_MagicAccessorImpl_klass());
1039
1040 if (!is_reflect &&
1041 !InstanceKlass::cast(klass_to_check)->is_same_or_direct_interface(resolved_klass())) {
1042 ResourceMark rm(THREAD);
1043 char buf[200];
1044 jio_snprintf(buf, sizeof(buf),
1045 "Interface method reference: %s, is in an indirect superinterface of %s",
1046 Method::name_and_sig_as_C_string(resolved_klass(),
1047 resolved_method->name(),
1048 resolved_method->signature()),
1049 current_klass->external_name());
1050 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1051 }
1052 }
1053
1054 // check if not static
1055 if (resolved_method->is_static()) {
1056 ResourceMark rm(THREAD);
1057 char buf[200];
1058 jio_snprintf(buf, sizeof(buf),
1059 "Expecting non-static method %s",
1060 Method::name_and_sig_as_C_string(resolved_klass(),
1061 resolved_method->name(),
1062 resolved_method->signature()));
1063 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1064 }
1065
1066 if (develop_log_is_enabled(Trace, itables)) {
1067 trace_method_resolution("invokespecial resolved method: caller-class:",
1068 current_klass, resolved_klass, resolved_method, true);
1069 }
1070
1071 return resolved_method;
1072 }
1073
1074 // throws runtime exceptions
1075 void LinkResolver::runtime_resolve_special_method(CallInfo& result,
1076 const methodHandle& resolved_method,
1077 KlassHandle resolved_klass,
1078 KlassHandle current_klass,
1079 bool check_access, TRAPS) {
1080
1081 // resolved method is selected method unless we have an old-style lookup
1082 // for a superclass method
1083 // Invokespecial for a superinterface, resolved method is selected method,
1084 // no checks for shadowing
1085 methodHandle sel_method(THREAD, resolved_method());
1086
1087 // check if this is an old-style super call and do a new lookup if so
1088 { KlassHandle method_klass = KlassHandle(THREAD,
1089 resolved_method->method_holder());
1090
1091 if (check_access &&
1092 // a) check if ACC_SUPER flag is set for the current class
1093 (current_klass->is_super() || !AllowNonVirtualCalls) &&
1094 // b) check if the class of the resolved_klass is a superclass
1095 // (not supertype in order to exclude interface classes) of the current class.
1096 // This check is not performed for super.invoke for interface methods
1097 // in super interfaces.
1098 current_klass->is_subclass_of(resolved_klass()) &&
1099 current_klass() != resolved_klass() &&
1100 // c) check if the method is not <init>
1101 resolved_method->name() != vmSymbols::object_initializer_name()) {
1102 // Lookup super method
1103 KlassHandle super_klass(THREAD, current_klass->super());
1104 sel_method = lookup_instance_method_in_klasses(super_klass,
1105 resolved_method->name(),
1106 resolved_method->signature(), CHECK);
1107 // check if found
1108 if (sel_method.is_null()) {
1109 ResourceMark rm(THREAD);
1110 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1111 Method::name_and_sig_as_C_string(resolved_klass(),
1112 resolved_method->name(),
1113 resolved_method->signature()));
1114 }
1115 }
1116 }
1117
1118 // check if not static
1119 if (sel_method->is_static()) {
1120 ResourceMark rm(THREAD);
1121 char buf[200];
1122 jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
1123 resolved_method->name(),
1124 resolved_method->signature()));
1125 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1126 }
1127
1128 // check if abstract
1129 if (sel_method->is_abstract()) {
1130 ResourceMark rm(THREAD);
1131 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1132 Method::name_and_sig_as_C_string(resolved_klass(),
1133 sel_method->name(),
1134 sel_method->signature()));
1135 }
1136
1137 if (develop_log_is_enabled(Trace, itables)) {
1138 trace_method_resolution("invokespecial selected method: resolved-class:",
1139 resolved_klass, resolved_klass, sel_method, true);
1140 }
1141
1142 // setup result
1143 result.set_static(resolved_klass, sel_method, CHECK);
1144 }
1145
1146 void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, KlassHandle receiver_klass,
1147 const LinkInfo& link_info,
1148 bool check_null_and_abstract, TRAPS) {
1149 methodHandle resolved_method = linktime_resolve_virtual_method(link_info, CHECK);
1150 runtime_resolve_virtual_method(result, resolved_method,
1151 link_info.resolved_klass(),
1152 recv, receiver_klass,
1153 check_null_and_abstract, CHECK);
1154 }
1155
1156 // throws linktime exceptions
1157 methodHandle LinkResolver::linktime_resolve_virtual_method(const LinkInfo& link_info,
1158 TRAPS) {
1159 // normal method resolution
1160 methodHandle resolved_method = resolve_method(link_info, /*require_methodref*/true, CHECK_NULL);
1161
1162 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1163 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1164
1165 // check if private interface method
1166 KlassHandle resolved_klass = link_info.resolved_klass();
1167 KlassHandle current_klass = link_info.current_klass();
1168
1169 if (resolved_klass->is_interface() && resolved_method->is_private()) {
1170 ResourceMark rm(THREAD);
1171 char buf[200];
1172 jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokevirtual: method %s, caller-class:%s",
1173 Method::name_and_sig_as_C_string(resolved_klass(),
1174 resolved_method->name(),
1175 resolved_method->signature()),
1176 (current_klass.is_null() ? "<NULL>" : current_klass->internal_name()));
1177 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1178 }
1179
1180 // check if not static
1181 if (resolved_method->is_static()) {
1182 ResourceMark rm(THREAD);
1183 char buf[200];
1184 jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
1185 resolved_method->name(),
1186 resolved_method->signature()));
1187 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1188 }
1189
1190 if (develop_log_is_enabled(Trace, vtables)) {
1191 trace_method_resolution("invokevirtual resolved method: caller-class:",
1192 current_klass, resolved_klass, resolved_method, false);
1193 }
1194
1195 return resolved_method;
1196 }
1197
1198 // throws runtime exceptions
1199 void LinkResolver::runtime_resolve_virtual_method(CallInfo& result,
1200 const methodHandle& resolved_method,
1201 KlassHandle resolved_klass,
1202 Handle recv,
1203 KlassHandle recv_klass,
1204 bool check_null_and_abstract,
1205 TRAPS) {
1206
1207 // setup default return values
1208 int vtable_index = Method::invalid_vtable_index;
1209 methodHandle selected_method;
1210
1211 assert(recv.is_null() || recv->is_oop(), "receiver is not an oop");
1212
1213 // runtime method resolution
1214 if (check_null_and_abstract && recv.is_null()) { // check if receiver exists
1215 THROW(vmSymbols::java_lang_NullPointerException());
1216 }
1217
1218 // Virtual methods cannot be resolved before its klass has been linked, for otherwise the Method*'s
1219 // has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since
1220 // a missing receiver might result in a bogus lookup.
1221 assert(resolved_method->method_holder()->is_linked(), "must be linked");
1222
1223 // do lookup based on receiver klass using the vtable index
1224 if (resolved_method->method_holder()->is_interface()) { // default or miranda method
1225 vtable_index = vtable_index_of_interface_method(resolved_klass,
1226 resolved_method);
1227 assert(vtable_index >= 0 , "we should have valid vtable index at this point");
1228
1229 InstanceKlass* inst = InstanceKlass::cast(recv_klass());
1230 selected_method = methodHandle(THREAD, inst->method_at_vtable(vtable_index));
1231 } else {
1232 // at this point we are sure that resolved_method is virtual and not
1233 // a default or miranda method; therefore, it must have a valid vtable index.
1234 assert(!resolved_method->has_itable_index(), "");
1235 vtable_index = resolved_method->vtable_index();
1236 // We could get a negative vtable_index for final methods,
1237 // because as an optimization they are they are never put in the vtable,
1238 // unless they override an existing method.
1239 // If we do get a negative, it means the resolved method is the the selected
1240 // method, and it can never be changed by an override.
1241 if (vtable_index == Method::nonvirtual_vtable_index) {
1242 assert(resolved_method->can_be_statically_bound(), "cannot override this method");
1243 selected_method = resolved_method;
1244 } else {
1245 // recv_klass might be an arrayKlassOop but all vtables start at
1246 // the same place. The cast is to avoid virtual call and assertion.
1247 InstanceKlass* inst = (InstanceKlass*)recv_klass();
1248 selected_method = methodHandle(THREAD, inst->method_at_vtable(vtable_index));
1249 }
1250 }
1251
1252 // check if method exists
1253 if (selected_method.is_null()) {
1254 ResourceMark rm(THREAD);
1255 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1256 Method::name_and_sig_as_C_string(resolved_klass(),
1257 resolved_method->name(),
1258 resolved_method->signature()));
1259 }
1260
1261 // check if abstract
1262 if (check_null_and_abstract && selected_method->is_abstract()) {
1263 ResourceMark rm(THREAD);
1264 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1265 Method::name_and_sig_as_C_string(resolved_klass(),
1266 selected_method->name(),
1267 selected_method->signature()));
1268 }
1269
1270 if (develop_log_is_enabled(Trace, vtables)) {
1271 trace_method_resolution("invokevirtual selected method: receiver-class:",
1272 recv_klass, resolved_klass, selected_method,
1273 false, vtable_index);
1274 }
1275 // setup result
1276 result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK);
1277 }
1278
1279 void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, KlassHandle recv_klass,
1280 const LinkInfo& link_info,
1281 bool check_null_and_abstract, TRAPS) {
1282 // throws linktime exceptions
1283 methodHandle resolved_method = linktime_resolve_interface_method(link_info, CHECK);
1284 runtime_resolve_interface_method(result, resolved_method,link_info.resolved_klass(),
1285 recv, recv_klass, check_null_and_abstract, CHECK);
1286 }
1287
1288 methodHandle LinkResolver::linktime_resolve_interface_method(const LinkInfo& link_info,
1289 TRAPS) {
1290 // normal interface method resolution
1291 methodHandle resolved_method = resolve_interface_method(link_info, true, CHECK_NULL);
1292 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1293 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1294
1295 return resolved_method;
1296 }
1297
1298 // throws runtime exceptions
1299 void LinkResolver::runtime_resolve_interface_method(CallInfo& result,
1300 const methodHandle& resolved_method,
1301 KlassHandle resolved_klass,
1302 Handle recv,
1303 KlassHandle recv_klass,
1304 bool check_null_and_abstract, TRAPS) {
1305 // check if receiver exists
1306 if (check_null_and_abstract && recv.is_null()) {
1307 THROW(vmSymbols::java_lang_NullPointerException());
1308 }
1309
1310 // check if private interface method
1311 if (resolved_klass->is_interface() && resolved_method->is_private()) {
1312 ResourceMark rm(THREAD);
1313 char buf[200];
1314 jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokeinterface: method %s",
1315 Method::name_and_sig_as_C_string(resolved_klass(),
1316 resolved_method->name(),
1317 resolved_method->signature()));
1318 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1319 }
1320
1321 // check if receiver klass implements the resolved interface
1322 if (!recv_klass->is_subtype_of(resolved_klass())) {
1323 ResourceMark rm(THREAD);
1324 char buf[200];
1325 jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s",
1326 recv_klass()->external_name(),
1327 resolved_klass()->external_name());
1328 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1329 }
1330
1331 // do lookup based on receiver klass
1332 // This search must match the linktime preparation search for itable initialization
1333 // to correctly enforce loader constraints for interface method inheritance
1334 methodHandle sel_method = lookup_instance_method_in_klasses(recv_klass,
1335 resolved_method->name(),
1336 resolved_method->signature(), CHECK);
1337 if (sel_method.is_null() && !check_null_and_abstract) {
1338 // In theory this is a harmless placeholder value, but
1339 // in practice leaving in null affects the nsk default method tests.
1340 // This needs further study.
1341 sel_method = resolved_method;
1342 }
1343 // check if method exists
1344 if (sel_method.is_null()) {
1345 ResourceMark rm(THREAD);
1346 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1347 Method::name_and_sig_as_C_string(recv_klass(),
1348 resolved_method->name(),
1349 resolved_method->signature()));
1350 }
1351 // check access
1352 // Throw Illegal Access Error if sel_method is not public.
1353 if (!sel_method->is_public()) {
1354 ResourceMark rm(THREAD);
1355 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(),
1356 Method::name_and_sig_as_C_string(recv_klass(),
1357 sel_method->name(),
1358 sel_method->signature()));
1359 }
1360 // check if abstract
1361 if (check_null_and_abstract && sel_method->is_abstract()) {
1362 ResourceMark rm(THREAD);
1363 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1364 Method::name_and_sig_as_C_string(recv_klass(),
1365 sel_method->name(),
1366 sel_method->signature()));
1367 }
1368
1369 if (develop_log_is_enabled(Trace, itables)) {
1370 trace_method_resolution("invokeinterface selected method: receiver-class",
1371 recv_klass, resolved_klass, sel_method, true);
1372 }
1373 // setup result
1374 if (!resolved_method->has_itable_index()) {
1375 int vtable_index = resolved_method->vtable_index();
1376 assert(vtable_index == sel_method->vtable_index(), "sanity check");
1377 result.set_virtual(resolved_klass, recv_klass, resolved_method, sel_method, vtable_index, CHECK);
1378 } else {
1379 int itable_index = resolved_method()->itable_index();
1380 result.set_interface(resolved_klass, recv_klass, resolved_method, sel_method, itable_index, CHECK);
1381 }
1382 }
1383
1384
1385 methodHandle LinkResolver::linktime_resolve_interface_method_or_null(
1386 const LinkInfo& link_info) {
1387 EXCEPTION_MARK;
1388 methodHandle method_result = linktime_resolve_interface_method(link_info, THREAD);
1389 if (HAS_PENDING_EXCEPTION) {
1390 CLEAR_PENDING_EXCEPTION;
1391 return methodHandle();
1392 } else {
1393 return method_result;
1394 }
1395 }
1396
1397 methodHandle LinkResolver::linktime_resolve_virtual_method_or_null(
1398 const LinkInfo& link_info) {
1399 EXCEPTION_MARK;
1400 methodHandle method_result = linktime_resolve_virtual_method(link_info, THREAD);
1401 if (HAS_PENDING_EXCEPTION) {
1402 CLEAR_PENDING_EXCEPTION;
1403 return methodHandle();
1404 } else {
1405 return method_result;
1406 }
1407 }
1408
1409 methodHandle LinkResolver::resolve_virtual_call_or_null(
1410 KlassHandle receiver_klass,
1411 const LinkInfo& link_info) {
1412 EXCEPTION_MARK;
1413 CallInfo info;
1414 resolve_virtual_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1415 if (HAS_PENDING_EXCEPTION) {
1416 CLEAR_PENDING_EXCEPTION;
1417 return methodHandle();
1418 }
1419 return info.selected_method();
1420 }
1421
1422 methodHandle LinkResolver::resolve_interface_call_or_null(
1423 KlassHandle receiver_klass,
1424 const LinkInfo& link_info) {
1425 EXCEPTION_MARK;
1426 CallInfo info;
1427 resolve_interface_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1428 if (HAS_PENDING_EXCEPTION) {
1429 CLEAR_PENDING_EXCEPTION;
1430 return methodHandle();
1431 }
1432 return info.selected_method();
1433 }
1434
1435 int LinkResolver::resolve_virtual_vtable_index(KlassHandle receiver_klass,
1436 const LinkInfo& link_info) {
1437 EXCEPTION_MARK;
1438 CallInfo info;
1439 resolve_virtual_call(info, Handle(), receiver_klass, link_info,
1440 /*check_null_or_abstract*/false, THREAD);
1441 if (HAS_PENDING_EXCEPTION) {
1442 CLEAR_PENDING_EXCEPTION;
1443 return Method::invalid_vtable_index;
1444 }
1445 return info.vtable_index();
1446 }
1447
1448 methodHandle LinkResolver::resolve_static_call_or_null(const LinkInfo& link_info) {
1449 EXCEPTION_MARK;
1450 CallInfo info;
1451 resolve_static_call(info, link_info, /*initialize_class*/false, THREAD);
1452 if (HAS_PENDING_EXCEPTION) {
1453 CLEAR_PENDING_EXCEPTION;
1454 return methodHandle();
1455 }
1456 return info.selected_method();
1457 }
1458
1459 methodHandle LinkResolver::resolve_special_call_or_null(const LinkInfo& link_info) {
1460 EXCEPTION_MARK;
1461 CallInfo info;
1462 resolve_special_call(info, link_info, THREAD);
1463 if (HAS_PENDING_EXCEPTION) {
1464 CLEAR_PENDING_EXCEPTION;
1465 return methodHandle();
1466 }
1467 return info.selected_method();
1468 }
1469
1470
1471
1472 //------------------------------------------------------------------------------------------------------------------------
1473 // ConstantPool entries
1474
1475 void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) {
1476 switch (byte) {
1477 case Bytecodes::_invokestatic : resolve_invokestatic (result, pool, index, CHECK); break;
1478 case Bytecodes::_invokespecial : resolve_invokespecial (result, pool, index, CHECK); break;
1479 case Bytecodes::_invokevirtual : resolve_invokevirtual (result, recv, pool, index, CHECK); break;
1480 case Bytecodes::_invokehandle : resolve_invokehandle (result, pool, index, CHECK); break;
1481 case Bytecodes::_invokedynamic : resolve_invokedynamic (result, pool, index, CHECK); break;
1482 case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break;
1483 }
1484 return;
1485 }
1486
1487 void LinkResolver::resolve_invokestatic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1488 LinkInfo link_info(pool, index, CHECK);
1489 resolve_static_call(result, link_info, /*initialize_class*/true, CHECK);
1490 }
1491
1492
1493 void LinkResolver::resolve_invokespecial(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1494 LinkInfo link_info(pool, index, CHECK);
1495 resolve_special_call(result, link_info, CHECK);
1496 }
1497
1498
1499 void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv,
1500 const constantPoolHandle& pool, int index,
1501 TRAPS) {
1502
1503 LinkInfo link_info(pool, index, CHECK);
1504 KlassHandle recvrKlass (THREAD, recv.is_null() ? (Klass*)NULL : recv->klass());
1505 resolve_virtual_call(result, recv, recvrKlass, link_info, /*check_null_or_abstract*/true, CHECK);
1506 }
1507
1508
1509 void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, TRAPS) {
1510 LinkInfo link_info(pool, index, CHECK);
1511 KlassHandle recvrKlass (THREAD, recv.is_null() ? (Klass*)NULL : recv->klass());
1512 resolve_interface_call(result, recv, recvrKlass, link_info, true, CHECK);
1513 }
1514
1515
1516 void LinkResolver::resolve_invokehandle(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1517 // This guy is reached from InterpreterRuntime::resolve_invokehandle.
1518 LinkInfo link_info(pool, index, CHECK);
1519 if (TraceMethodHandles) {
1520 ResourceMark rm(THREAD);
1521 tty->print_cr("resolve_invokehandle %s %s", link_info.name()->as_C_string(),
1522 link_info.signature()->as_C_string());
1523 }
1524 resolve_handle_call(result, link_info, CHECK);
1525 }
1526
1527 void LinkResolver::resolve_handle_call(CallInfo& result,
1528 const LinkInfo& link_info,
1529 TRAPS) {
1530 // JSR 292: this must be an implicitly generated method MethodHandle.invokeExact(*...) or similar
1531 assert(link_info.resolved_klass()() == SystemDictionary::MethodHandle_klass(), "");
1532 assert(MethodHandles::is_signature_polymorphic_name(link_info.name()), "");
1533 Handle resolved_appendix;
1534 Handle resolved_method_type;
1535 methodHandle resolved_method = lookup_polymorphic_method(link_info,
1536 &resolved_appendix, &resolved_method_type, CHECK);
1537 result.set_handle(resolved_method, resolved_appendix, resolved_method_type, CHECK);
1538 }
1539
1540 static void wrap_invokedynamic_exception(TRAPS) {
1541 if (HAS_PENDING_EXCEPTION) {
1542 if (TraceMethodHandles) {
1543 tty->print_cr("invokedynamic throws BSME for " INTPTR_FORMAT, p2i((void *)PENDING_EXCEPTION));
1544 PENDING_EXCEPTION->print();
1545 }
1546 if (PENDING_EXCEPTION->is_a(SystemDictionary::BootstrapMethodError_klass())) {
1547 // throw these guys, since they are already wrapped
1548 return;
1549 }
1550 if (!PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1551 // intercept only LinkageErrors which might have failed to wrap
1552 return;
1553 }
1554 // See the "Linking Exceptions" section for the invokedynamic instruction in the JVMS.
1555 Handle nested_exception(THREAD, PENDING_EXCEPTION);
1556 CLEAR_PENDING_EXCEPTION;
1557 THROW_CAUSE(vmSymbols::java_lang_BootstrapMethodError(), nested_exception)
1558 }
1559 }
1560
1561 void LinkResolver::resolve_invokedynamic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1562 Symbol* method_name = pool->name_ref_at(index);
1563 Symbol* method_signature = pool->signature_ref_at(index);
1564 KlassHandle current_klass = KlassHandle(THREAD, pool->pool_holder());
1565
1566 // Resolve the bootstrap specifier (BSM + optional arguments).
1567 Handle bootstrap_specifier;
1568 // Check if CallSite has been bound already:
1569 ConstantPoolCacheEntry* cpce = pool->invokedynamic_cp_cache_entry_at(index);
1570 if (cpce->is_f1_null()) {
1571 int pool_index = cpce->constant_pool_index();
1572 oop bsm_info = pool->resolve_bootstrap_specifier_at(pool_index, THREAD);
1573 wrap_invokedynamic_exception(CHECK);
1574 assert(bsm_info != NULL, "");
1575 // FIXME: Cache this once per BootstrapMethods entry, not once per CONSTANT_InvokeDynamic.
1576 bootstrap_specifier = Handle(THREAD, bsm_info);
1577 }
1578 if (!cpce->is_f1_null()) {
1579 methodHandle method( THREAD, cpce->f1_as_method());
1580 Handle appendix( THREAD, cpce->appendix_if_resolved(pool));
1581 Handle method_type(THREAD, cpce->method_type_if_resolved(pool));
1582 result.set_handle(method, appendix, method_type, THREAD);
1583 wrap_invokedynamic_exception(CHECK);
1584 return;
1585 }
1586
1587 if (TraceMethodHandles) {
1588 ResourceMark rm(THREAD);
1589 tty->print_cr("resolve_invokedynamic #%d %s %s",
1590 ConstantPool::decode_invokedynamic_index(index),
1591 method_name->as_C_string(), method_signature->as_C_string());
1592 tty->print(" BSM info: "); bootstrap_specifier->print();
1593 }
1594
1595 resolve_dynamic_call(result, bootstrap_specifier, method_name, method_signature, current_klass, CHECK);
1596 }
1597
1598 void LinkResolver::resolve_dynamic_call(CallInfo& result,
1599 Handle bootstrap_specifier,
1600 Symbol* method_name, Symbol* method_signature,
1601 KlassHandle current_klass,
1602 TRAPS) {
1603 // JSR 292: this must resolve to an implicitly generated method MH.linkToCallSite(*...)
1604 // The appendix argument is likely to be a freshly-created CallSite.
1605 Handle resolved_appendix;
1606 Handle resolved_method_type;
1607 methodHandle resolved_method =
1608 SystemDictionary::find_dynamic_call_site_invoker(current_klass,
1609 bootstrap_specifier,
1610 method_name, method_signature,
1611 &resolved_appendix,
1612 &resolved_method_type,
1613 THREAD);
1614 wrap_invokedynamic_exception(CHECK);
1615 result.set_handle(resolved_method, resolved_appendix, resolved_method_type, THREAD);
1616 wrap_invokedynamic_exception(CHECK);
1617 }