1 /*
2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/defaultMethods.hpp"
27 #include "classfile/symbolTable.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "compiler/compileBroker.hpp"
31 #include "gc/shared/collectedHeap.inline.hpp"
32 #include "interpreter/bytecode.hpp"
33 #include "interpreter/interpreterRuntime.hpp"
34 #include "interpreter/linkResolver.hpp"
35 #include "logging/log.hpp"
36 #include "memory/resourceArea.hpp"
37 #include "memory/universe.inline.hpp"
38 #include "oops/instanceKlass.hpp"
39 #include "oops/method.hpp"
40 #include "oops/objArrayOop.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "prims/methodHandles.hpp"
43 #include "prims/nativeLookup.hpp"
44 #include "runtime/compilationPolicy.hpp"
45 #include "runtime/fieldDescriptor.hpp"
46 #include "runtime/frame.inline.hpp"
47 #include "runtime/handles.inline.hpp"
48 #include "runtime/reflection.hpp"
49 #include "runtime/signature.hpp"
50 #include "runtime/thread.inline.hpp"
51 #include "runtime/vmThread.hpp"
52
53
54 //------------------------------------------------------------------------------------------------------------------------
55 // Implementation of CallInfo
56
57
58 void CallInfo::set_static(KlassHandle resolved_klass, const methodHandle& resolved_method, TRAPS) {
59 int vtable_index = Method::nonvirtual_vtable_index;
60 set_common(resolved_klass, resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK);
61 }
62
63
64 void CallInfo::set_interface(KlassHandle resolved_klass,
65 KlassHandle selected_klass,
66 const methodHandle& resolved_method,
67 const methodHandle& selected_method,
68 int itable_index, TRAPS) {
69 // This is only called for interface methods. If the resolved_method
70 // comes from java/lang/Object, it can be the subject of a virtual call, so
71 // we should pick the vtable index from the resolved method.
72 // In that case, the caller must call set_virtual instead of set_interface.
73 assert(resolved_method->method_holder()->is_interface(), "");
74 assert(itable_index == resolved_method()->itable_index(), "");
75 set_common(resolved_klass, selected_klass, resolved_method, selected_method, CallInfo::itable_call, itable_index, CHECK);
76 }
77
78 void CallInfo::set_virtual(KlassHandle resolved_klass,
79 KlassHandle selected_klass,
80 const methodHandle& resolved_method,
81 const methodHandle& selected_method,
82 int vtable_index, TRAPS) {
83 assert(vtable_index >= 0 || vtable_index == Method::nonvirtual_vtable_index, "valid index");
84 assert(vtable_index < 0 || !resolved_method->has_vtable_index() || vtable_index == resolved_method->vtable_index(), "");
85 CallKind kind = (vtable_index >= 0 && !resolved_method->can_be_statically_bound() ? CallInfo::vtable_call : CallInfo::direct_call);
86 set_common(resolved_klass, selected_klass, resolved_method, selected_method, kind, vtable_index, CHECK);
87 assert(!resolved_method->is_compiled_lambda_form(), "these must be handled via an invokehandle call");
88 }
89
90 void CallInfo::set_handle(const methodHandle& resolved_method,
91 Handle resolved_appendix,
92 Handle resolved_method_type, TRAPS) {
93 set_handle(SystemDictionary::MethodHandle_klass(), resolved_method, resolved_appendix, resolved_method_type, CHECK);
94 }
95
96 void CallInfo::set_handle(KlassHandle resolved_klass,
97 const methodHandle& resolved_method,
98 Handle resolved_appendix,
99 Handle resolved_method_type, TRAPS) {
100 if (resolved_method.is_null()) {
101 THROW_MSG(vmSymbols::java_lang_InternalError(), "resolved method is null");
102 }
103 assert(resolved_method->intrinsic_id() == vmIntrinsics::_invokeBasic ||
104 resolved_method->is_compiled_lambda_form(),
105 "linkMethod must return one of these");
106 int vtable_index = Method::nonvirtual_vtable_index;
107 assert(!resolved_method->has_vtable_index(), "");
108 set_common(resolved_klass, resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK);
109 _resolved_appendix = resolved_appendix;
110 _resolved_method_type = resolved_method_type;
111 }
112
113 void CallInfo::set_common(KlassHandle resolved_klass,
114 KlassHandle selected_klass,
115 const methodHandle& resolved_method,
116 const methodHandle& selected_method,
117 CallKind kind,
118 int index,
119 TRAPS) {
120 assert(resolved_method->signature() == selected_method->signature(), "signatures must correspond");
121 _resolved_klass = resolved_klass;
122 _selected_klass = selected_klass;
123 _resolved_method = resolved_method;
124 _selected_method = selected_method;
125 _call_kind = kind;
126 _call_index = index;
127 _resolved_appendix = Handle();
128 DEBUG_ONLY(verify()); // verify before making side effects
129
130 if (CompilationPolicy::must_be_compiled(selected_method)) {
131 // This path is unusual, mostly used by the '-Xcomp' stress test mode.
132
133 // Note: with several active threads, the must_be_compiled may be true
134 // while can_be_compiled is false; remove assert
135 // assert(CompilationPolicy::can_be_compiled(selected_method), "cannot compile");
136 if (!THREAD->can_call_java()) {
137 // don't force compilation, resolve was on behalf of compiler
138 return;
139 }
140 if (selected_method->method_holder()->is_not_initialized()) {
141 // 'is_not_initialized' means not only '!is_initialized', but also that
142 // initialization has not been started yet ('!being_initialized')
143 // Do not force compilation of methods in uninitialized classes.
144 // Note that doing this would throw an assert later,
145 // in CompileBroker::compile_method.
146 // We sometimes use the link resolver to do reflective lookups
147 // even before classes are initialized.
148 return;
149 }
150 CompileBroker::compile_method(selected_method, InvocationEntryBci,
151 CompilationPolicy::policy()->initial_compile_level(),
152 methodHandle(), 0, "must_be_compiled", CHECK);
153 }
154 }
155
156 // utility query for unreflecting a method
157 CallInfo::CallInfo(Method* resolved_method, Klass* resolved_klass) {
158 Klass* resolved_method_holder = resolved_method->method_holder();
159 if (resolved_klass == NULL) { // 2nd argument defaults to holder of 1st
160 resolved_klass = resolved_method_holder;
161 }
162 _resolved_klass = resolved_klass;
163 _selected_klass = resolved_klass;
164 _resolved_method = resolved_method;
165 _selected_method = resolved_method;
166 // classify:
167 CallKind kind = CallInfo::unknown_kind;
168 int index = resolved_method->vtable_index();
169 if (resolved_method->can_be_statically_bound()) {
170 kind = CallInfo::direct_call;
171 } else if (!resolved_method_holder->is_interface()) {
172 // Could be an Object method inherited into an interface, but still a vtable call.
173 kind = CallInfo::vtable_call;
174 } else if (!resolved_klass->is_interface()) {
175 // A default or miranda method. Compute the vtable index.
176 ResourceMark rm;
177 klassVtable* vt = resolved_klass->vtable();
178 index = LinkResolver::vtable_index_of_interface_method(resolved_klass,
179 resolved_method);
180 assert(index >= 0 , "we should have valid vtable index at this point");
181
182 kind = CallInfo::vtable_call;
183 } else if (resolved_method->has_vtable_index()) {
184 // Can occur if an interface redeclares a method of Object.
185
186 #ifdef ASSERT
187 // Ensure that this is really the case.
188 KlassHandle object_klass = SystemDictionary::Object_klass();
189 Method * object_resolved_method = object_klass()->vtable()->method_at(index);
190 assert(object_resolved_method->name() == resolved_method->name(),
191 "Object and interface method names should match at vtable index %d, %s != %s",
192 index, object_resolved_method->name()->as_C_string(), resolved_method->name()->as_C_string());
193 assert(object_resolved_method->signature() == resolved_method->signature(),
194 "Object and interface method signatures should match at vtable index %d, %s != %s",
195 index, object_resolved_method->signature()->as_C_string(), resolved_method->signature()->as_C_string());
196 #endif // ASSERT
197
198 kind = CallInfo::vtable_call;
199 } else {
200 // A regular interface call.
201 kind = CallInfo::itable_call;
202 index = resolved_method->itable_index();
203 }
204 assert(index == Method::nonvirtual_vtable_index || index >= 0, "bad index %d", index);
205 _call_kind = kind;
206 _call_index = index;
207 _resolved_appendix = Handle();
208 DEBUG_ONLY(verify());
209 }
210
211 #ifdef ASSERT
212 void CallInfo::verify() {
213 switch (call_kind()) { // the meaning and allowed value of index depends on kind
214 case CallInfo::direct_call:
215 if (_call_index == Method::nonvirtual_vtable_index) break;
216 // else fall through to check vtable index:
217 case CallInfo::vtable_call:
218 assert(resolved_klass()->verify_vtable_index(_call_index), "");
219 break;
220 case CallInfo::itable_call:
221 assert(resolved_method()->method_holder()->verify_itable_index(_call_index), "");
222 break;
223 case CallInfo::unknown_kind:
224 assert(call_kind() != CallInfo::unknown_kind, "CallInfo must be set");
225 break;
226 default:
227 fatal("Unexpected call kind %d", call_kind());
228 }
229 }
230 #endif //ASSERT
231
232 #ifndef PRODUCT
233 void CallInfo::print() {
234 ResourceMark rm;
235 const char* kindstr = "unknown";
236 switch (_call_kind) {
237 case direct_call: kindstr = "direct"; break;
238 case vtable_call: kindstr = "vtable"; break;
239 case itable_call: kindstr = "itable"; break;
240 }
241 tty->print_cr("Call %s@%d %s", kindstr, _call_index,
242 _resolved_method.is_null() ? "(none)" : _resolved_method->name_and_sig_as_C_string());
243 }
244 #endif
245
246 //------------------------------------------------------------------------------------------------------------------------
247 // Implementation of LinkInfo
248
249 LinkInfo::LinkInfo(const constantPoolHandle& pool, int index, TRAPS) {
250 // resolve klass
251 Klass* result = pool->klass_ref_at(index, CHECK);
252 _resolved_klass = KlassHandle(THREAD, result);
253
254 // Get name, signature, and static klass
255 _name = pool->name_ref_at(index);
256 _signature = pool->signature_ref_at(index);
257 _current_klass = KlassHandle(THREAD, pool->pool_holder());
258
259 // Coming from the constant pool always checks access
260 _check_access = true;
261 }
262
263 char* LinkInfo::method_string() const {
264 return Method::name_and_sig_as_C_string(_resolved_klass(), _name, _signature);
265 }
266
267 #ifndef PRODUCT
268 void LinkInfo::print() {
269 ResourceMark rm;
270 tty->print_cr("Link resolved_klass=%s name=%s signature=%s current_klass=%s check_access=%s",
271 _resolved_klass->name()->as_C_string(),
272 _name->as_C_string(),
273 _signature->as_C_string(),
274 _current_klass.is_null() ? "(none)" : _current_klass->name()->as_C_string(),
275 _check_access ? "true" : "false");
276 }
277 #endif // PRODUCT
278 //------------------------------------------------------------------------------------------------------------------------
279 // Klass resolution
280
281 void LinkResolver::check_klass_accessability(KlassHandle ref_klass, KlassHandle sel_klass, TRAPS) {
282 Reflection::VerifyClassAccessResults vca_result =
283 Reflection::verify_class_access(ref_klass(), sel_klass(), true);
284 if (vca_result != Reflection::ACCESS_OK) {
285 ResourceMark rm(THREAD);
286 char* msg = Reflection::verify_class_access_msg(ref_klass(), sel_klass(), vca_result);
287 if (msg == NULL) {
288 Exceptions::fthrow(
289 THREAD_AND_LOCATION,
290 vmSymbols::java_lang_IllegalAccessError(),
291 "failed to access class %s from class %s",
292 sel_klass->external_name(),
293 ref_klass->external_name());
294 } else {
295 // Use module specific message returned by verify_class_access_msg().
296 Exceptions::fthrow(
297 THREAD_AND_LOCATION,
298 vmSymbols::java_lang_IllegalAccessError(),
299 "%s", msg);
300 }
301 }
302 }
303
304 //------------------------------------------------------------------------------------------------------------------------
305 // Method resolution
306 //
307 // According to JVM spec. $5.4.3c & $5.4.3d
308
309 // Look up method in klasses, including static methods
310 // Then look up local default methods
311 methodHandle LinkResolver::lookup_method_in_klasses(const LinkInfo& link_info,
312 bool checkpolymorphism,
313 bool in_imethod_resolve, TRAPS) {
314 KlassHandle klass = link_info.resolved_klass();
315 Symbol* name = link_info.name();
316 Symbol* signature = link_info.signature();
317
318 // Ignore overpasses so statics can be found during resolution
319 Method* result = klass->uncached_lookup_method(name, signature, Klass::skip_overpass);
320
321 if (klass->is_array_klass()) {
322 // Only consider klass and super klass for arrays
323 return methodHandle(THREAD, result);
324 }
325
326 InstanceKlass* ik = InstanceKlass::cast(klass());
327
328 // JDK 8, JVMS 5.4.3.4: Interface method resolution should
329 // ignore static and non-public methods of java.lang.Object,
330 // like clone, finalize, registerNatives.
331 if (in_imethod_resolve &&
332 result != NULL &&
333 ik->is_interface() &&
334 (result->is_static() || !result->is_public()) &&
335 result->method_holder() == SystemDictionary::Object_klass()) {
336 result = NULL;
337 }
338
339 // Before considering default methods, check for an overpass in the
340 // current class if a method has not been found.
341 if (result == NULL) {
342 result = ik->find_method(name, signature);
343 }
344
345 if (result == NULL) {
346 Array<Method*>* default_methods = ik->default_methods();
347 if (default_methods != NULL) {
348 result = InstanceKlass::find_method(default_methods, name, signature);
349 }
350 }
351
352 if (checkpolymorphism && result != NULL) {
353 vmIntrinsics::ID iid = result->intrinsic_id();
354 if (MethodHandles::is_signature_polymorphic(iid)) {
355 // Do not link directly to these. The VM must produce a synthetic one using lookup_polymorphic_method.
356 return NULL;
357 }
358 }
359 return methodHandle(THREAD, result);
360 }
361
362 // returns first instance method
363 // Looks up method in classes, then looks up local default methods
364 methodHandle LinkResolver::lookup_instance_method_in_klasses(KlassHandle klass,
365 Symbol* name,
366 Symbol* signature, TRAPS) {
367 Method* result = klass->uncached_lookup_method(name, signature, Klass::find_overpass);
368
369 while (result != NULL && result->is_static() && result->method_holder()->super() != NULL) {
370 Klass* super_klass = result->method_holder()->super();
371 result = super_klass->uncached_lookup_method(name, signature, Klass::find_overpass);
372 }
373
374 if (klass->is_array_klass()) {
375 // Only consider klass and super klass for arrays
376 return methodHandle(THREAD, result);
377 }
378
379 if (result == NULL) {
380 Array<Method*>* default_methods = InstanceKlass::cast(klass())->default_methods();
381 if (default_methods != NULL) {
382 result = InstanceKlass::find_method(default_methods, name, signature);
383 assert(result == NULL || !result->is_static(), "static defaults not allowed");
384 }
385 }
386 return methodHandle(THREAD, result);
387 }
388
389 int LinkResolver::vtable_index_of_interface_method(KlassHandle klass,
390 const methodHandle& resolved_method) {
391
392 int vtable_index = Method::invalid_vtable_index;
393 Symbol* name = resolved_method->name();
394 Symbol* signature = resolved_method->signature();
395 InstanceKlass* ik = InstanceKlass::cast(klass());
396
397 // First check in default method array
398 if (!resolved_method->is_abstract() && ik->default_methods() != NULL) {
399 int index = InstanceKlass::find_method_index(ik->default_methods(),
400 name, signature, Klass::find_overpass,
401 Klass::find_static, Klass::find_private);
402 if (index >= 0 ) {
403 vtable_index = ik->default_vtable_indices()->at(index);
404 }
405 }
406 if (vtable_index == Method::invalid_vtable_index) {
407 // get vtable_index for miranda methods
408 ResourceMark rm;
409 klassVtable *vt = ik->vtable();
410 vtable_index = vt->index_of_miranda(name, signature);
411 }
412 return vtable_index;
413 }
414
415 methodHandle LinkResolver::lookup_method_in_interfaces(const LinkInfo& cp_info, TRAPS) {
416 InstanceKlass *ik = InstanceKlass::cast(cp_info.resolved_klass()());
417
418 // Specify 'true' in order to skip default methods when searching the
419 // interfaces. Function lookup_method_in_klasses() already looked for
420 // the method in the default methods table.
421 return methodHandle(THREAD,
422 ik->lookup_method_in_all_interfaces(cp_info.name(), cp_info.signature(),
423 Klass::skip_defaults));
424 }
425
426 methodHandle LinkResolver::lookup_polymorphic_method(
427 const LinkInfo& link_info,
428 Handle *appendix_result_or_null,
429 Handle *method_type_result,
430 TRAPS) {
431 KlassHandle klass = link_info.resolved_klass();
432 Symbol* name = link_info.name();
433 Symbol* full_signature = link_info.signature();
434
435 vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name);
436 if (TraceMethodHandles) {
437 ResourceMark rm(THREAD);
438 tty->print_cr("lookup_polymorphic_method iid=%s %s.%s%s",
439 vmIntrinsics::name_at(iid), klass->external_name(),
440 name->as_C_string(), full_signature->as_C_string());
441 }
442 if ((klass() == SystemDictionary::MethodHandle_klass() ||
443 klass() == SystemDictionary::VarHandle_klass()) &&
444 iid != vmIntrinsics::_none) {
445 if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) {
446 // Most of these do not need an up-call to Java to resolve, so can be done anywhere.
447 // Do not erase last argument type (MemberName) if it is a static linkTo method.
448 bool keep_last_arg = MethodHandles::is_signature_polymorphic_static(iid);
449 TempNewSymbol basic_signature =
450 MethodHandles::lookup_basic_type_signature(full_signature, keep_last_arg, CHECK_NULL);
451 if (TraceMethodHandles) {
452 ResourceMark rm(THREAD);
453 tty->print_cr("lookup_polymorphic_method %s %s => basic %s",
454 name->as_C_string(),
455 full_signature->as_C_string(),
456 basic_signature->as_C_string());
457 }
458 methodHandle result = SystemDictionary::find_method_handle_intrinsic(iid,
459 basic_signature,
460 CHECK_NULL);
461 if (result.not_null()) {
462 assert(result->is_method_handle_intrinsic(), "MH.invokeBasic or MH.linkTo* intrinsic");
463 assert(result->intrinsic_id() != vmIntrinsics::_invokeGeneric, "wrong place to find this");
464 assert(basic_signature == result->signature(), "predict the result signature");
465 if (TraceMethodHandles) {
466 ttyLocker ttyl;
467 tty->print("lookup_polymorphic_method => intrinsic ");
468 result->print_on(tty);
469 }
470 }
471 return result;
472 } else if (iid == vmIntrinsics::_invokeGeneric
473 && THREAD->can_call_java()
474 && appendix_result_or_null != NULL) {
475 // This is a method with type-checking semantics.
476 // We will ask Java code to spin an adapter method for it.
477 if (!MethodHandles::enabled()) {
478 // Make sure the Java part of the runtime has been booted up.
479 Klass* natives = SystemDictionary::MethodHandleNatives_klass();
480 if (natives == NULL || InstanceKlass::cast(natives)->is_not_initialized()) {
481 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_invoke_MethodHandleNatives(),
482 Handle(),
483 Handle(),
484 true,
485 CHECK_NULL);
486 }
487 }
488
489 Handle appendix;
490 Handle method_type;
491 methodHandle result = SystemDictionary::find_method_handle_invoker(
492 klass,
493 name,
494 full_signature,
495 link_info.current_klass(),
496 &appendix,
497 &method_type,
498 CHECK_NULL);
499 if (TraceMethodHandles) {
500 ttyLocker ttyl;
501 tty->print("lookup_polymorphic_method => (via Java) ");
502 result->print_on(tty);
503 tty->print(" lookup_polymorphic_method => appendix = ");
504 if (appendix.is_null()) tty->print_cr("(none)");
505 else appendix->print_on(tty);
506 }
507 if (result.not_null()) {
508 #ifdef ASSERT
509 ResourceMark rm(THREAD);
510
511 TempNewSymbol basic_signature =
512 MethodHandles::lookup_basic_type_signature(full_signature, CHECK_NULL);
513 int actual_size_of_params = result->size_of_parameters();
514 int expected_size_of_params = ArgumentSizeComputer(basic_signature).size();
515 // +1 for MethodHandle.this, +1 for trailing MethodType
516 if (!MethodHandles::is_signature_polymorphic_static(iid)) expected_size_of_params += 1;
517 if (appendix.not_null()) expected_size_of_params += 1;
518 if (actual_size_of_params != expected_size_of_params) {
519 tty->print_cr("*** basic_signature=%s", basic_signature->as_C_string());
520 tty->print_cr("*** result for %s: ", vmIntrinsics::name_at(iid));
521 result->print();
522 }
523 assert(actual_size_of_params == expected_size_of_params,
524 "%d != %d", actual_size_of_params, expected_size_of_params);
525 #endif //ASSERT
526
527 assert(appendix_result_or_null != NULL, "");
528 (*appendix_result_or_null) = appendix;
529 (*method_type_result) = method_type;
530 }
531 return result;
532 }
533 }
534 return NULL;
535 }
536
537 void LinkResolver::check_method_accessability(KlassHandle ref_klass,
538 KlassHandle resolved_klass,
539 KlassHandle sel_klass,
540 const methodHandle& sel_method,
541 TRAPS) {
542
543 AccessFlags flags = sel_method->access_flags();
544
545 // Special case: arrays always override "clone". JVMS 2.15.
546 // If the resolved klass is an array class, and the declaring class
547 // is java.lang.Object and the method is "clone", set the flags
548 // to public.
549 //
550 // We'll check for the method name first, as that's most likely
551 // to be false (so we'll short-circuit out of these tests).
552 if (sel_method->name() == vmSymbols::clone_name() &&
553 sel_klass() == SystemDictionary::Object_klass() &&
554 resolved_klass->is_array_klass()) {
555 // We need to change "protected" to "public".
556 assert(flags.is_protected(), "clone not protected?");
557 jint new_flags = flags.as_int();
558 new_flags = new_flags & (~JVM_ACC_PROTECTED);
559 new_flags = new_flags | JVM_ACC_PUBLIC;
560 flags.set_flags(new_flags);
561 }
562 // assert(extra_arg_result_or_null != NULL, "must be able to return extra argument");
563
564 if (!Reflection::verify_field_access(ref_klass(),
565 resolved_klass(),
566 sel_klass(),
567 flags,
568 true)) {
569 ResourceMark rm(THREAD);
570 Exceptions::fthrow(
571 THREAD_AND_LOCATION,
572 vmSymbols::java_lang_IllegalAccessError(),
573 "tried to access method %s.%s%s from class %s",
574 sel_klass->external_name(),
575 sel_method->name()->as_C_string(),
576 sel_method->signature()->as_C_string(),
577 ref_klass->external_name()
578 );
579 return;
580 }
581 }
582
583 methodHandle LinkResolver::resolve_method_statically(Bytecodes::Code code,
584 const constantPoolHandle& pool, int index, TRAPS) {
585 // This method is used only
586 // (1) in C2 from InlineTree::ok_to_inline (via ciMethod::check_call),
587 // and
588 // (2) in Bytecode_invoke::static_target
589 // It appears to fail when applied to an invokeinterface call site.
590 // FIXME: Remove this method and ciMethod::check_call; refactor to use the other LinkResolver entry points.
591 // resolve klass
592 KlassHandle resolved_klass;
593 if (code == Bytecodes::_invokedynamic) {
594 resolved_klass = SystemDictionary::MethodHandle_klass();
595 Symbol* method_name = vmSymbols::invoke_name();
596 Symbol* method_signature = pool->signature_ref_at(index);
597 KlassHandle current_klass(THREAD, pool->pool_holder());
598 LinkInfo link_info(resolved_klass, method_name, method_signature, current_klass);
599 return resolve_method(link_info, /*require_methodref*/false, THREAD);
600 }
601
602 LinkInfo link_info(pool, index, CHECK_NULL);
603 resolved_klass = link_info.resolved_klass();
604
605 if (pool->has_preresolution()
606 || (resolved_klass() == SystemDictionary::MethodHandle_klass() &&
607 MethodHandles::is_signature_polymorphic_name(resolved_klass(), link_info.name()))) {
608 Method* result = ConstantPool::method_at_if_loaded(pool, index);
609 if (result != NULL) {
610 return methodHandle(THREAD, result);
611 }
612 }
613
614 if (code == Bytecodes::_invokeinterface) {
615 return resolve_interface_method(link_info, code, THREAD);
616 } else if (code == Bytecodes::_invokevirtual) {
617 return resolve_method(link_info, /*require_methodref*/true, THREAD);
618 } else if (!resolved_klass->is_interface()) {
619 return resolve_method(link_info, /*require_methodref*/false, THREAD);
620 } else {
621 return resolve_interface_method(link_info, code, THREAD);
622 }
623 }
624
625 // Check and print a loader constraint violation message for method or interface method
626 void LinkResolver::check_method_loader_constraints(const LinkInfo& link_info,
627 const methodHandle& resolved_method,
628 const char* method_type, TRAPS) {
629 Handle current_loader(THREAD, link_info.current_klass()->class_loader());
630 Handle resolved_loader(THREAD, resolved_method->method_holder()->class_loader());
631
632 ResourceMark rm(THREAD);
633 Symbol* failed_type_symbol =
634 SystemDictionary::check_signature_loaders(link_info.signature(), current_loader,
635 resolved_loader, true, CHECK);
636 if (failed_type_symbol != NULL) {
637 const char* msg = "loader constraint violation: when resolving %s"
638 " \"%s\" the class loader (instance of %s) of the current class, %s,"
639 " and the class loader (instance of %s) for the method's defining class, %s, have"
640 " different Class objects for the type %s used in the signature";
641 char* sig = link_info.method_string();
642 const char* loader1_name = SystemDictionary::loader_name(current_loader());
643 char* current = link_info.current_klass()->name()->as_C_string();
644 const char* loader2_name = SystemDictionary::loader_name(resolved_loader());
645 char* target = resolved_method->method_holder()->name()->as_C_string();
646 char* failed_type_name = failed_type_symbol->as_C_string();
647 size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1_name) +
648 strlen(current) + strlen(loader2_name) + strlen(target) +
649 strlen(failed_type_name) + strlen(method_type) + 1;
650 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen);
651 jio_snprintf(buf, buflen, msg, method_type, sig, loader1_name, current, loader2_name,
652 target, failed_type_name);
653 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf);
654 }
655 }
656
657 void LinkResolver::check_field_loader_constraints(Symbol* field, Symbol* sig,
658 KlassHandle current_klass,
659 KlassHandle sel_klass, TRAPS) {
660 Handle ref_loader(THREAD, current_klass->class_loader());
661 Handle sel_loader(THREAD, sel_klass->class_loader());
662
663 ResourceMark rm(THREAD); // needed for check_signature_loaders
664 Symbol* failed_type_symbol =
665 SystemDictionary::check_signature_loaders(sig,
666 ref_loader, sel_loader,
667 false,
668 CHECK);
669 if (failed_type_symbol != NULL) {
670 const char* msg = "loader constraint violation: when resolving field"
671 " \"%s\" the class loader (instance of %s) of the referring class, "
672 "%s, and the class loader (instance of %s) for the field's resolved "
673 "type, %s, have different Class objects for that type";
674 char* field_name = field->as_C_string();
675 const char* loader1_name = SystemDictionary::loader_name(ref_loader());
676 char* sel = sel_klass->name()->as_C_string();
677 const char* loader2_name = SystemDictionary::loader_name(sel_loader());
678 char* failed_type_name = failed_type_symbol->as_C_string();
679 size_t buflen = strlen(msg) + strlen(field_name) + strlen(loader1_name) +
680 strlen(sel) + strlen(loader2_name) + strlen(failed_type_name) + 1;
681 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen);
682 jio_snprintf(buf, buflen, msg, field_name, loader1_name, sel, loader2_name,
683 failed_type_name);
684 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf);
685 }
686 }
687
688 methodHandle LinkResolver::resolve_method(const LinkInfo& link_info,
689 bool require_methodref, TRAPS) {
690
691 Handle nested_exception;
692 KlassHandle resolved_klass = link_info.resolved_klass();
693
694 // 1. check if methodref required, that resolved_klass is not interfacemethodref
695 if (require_methodref && resolved_klass->is_interface()) {
696 ResourceMark rm(THREAD);
697 char buf[200];
698 jio_snprintf(buf, sizeof(buf), "Found interface %s, but class was expected",
699 resolved_klass()->external_name());
700 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
701 }
702
703 // 2. lookup method in resolved klass and its super klasses
704 methodHandle resolved_method = lookup_method_in_klasses(link_info, true, false, CHECK_NULL);
705
706 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) { // not found in the class hierarchy
707 // 3. lookup method in all the interfaces implemented by the resolved klass
708 resolved_method = lookup_method_in_interfaces(link_info, CHECK_NULL);
709
710 if (resolved_method.is_null()) {
711 // JSR 292: see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc
712 resolved_method = lookup_polymorphic_method(link_info, (Handle*)NULL, (Handle*)NULL, THREAD);
713 if (HAS_PENDING_EXCEPTION) {
714 nested_exception = Handle(THREAD, PENDING_EXCEPTION);
715 CLEAR_PENDING_EXCEPTION;
716 }
717 }
718 }
719
720 if (resolved_method.is_null()) {
721 // 4. method lookup failed
722 ResourceMark rm(THREAD);
723 THROW_MSG_CAUSE_(vmSymbols::java_lang_NoSuchMethodError(),
724 Method::name_and_sig_as_C_string(resolved_klass(),
725 link_info.name(),
726 link_info.signature()),
727 nested_exception, NULL);
728 }
729
730 // 5. access checks, access checking may be turned off when calling from within the VM.
731 KlassHandle current_klass = link_info.current_klass();
732 if (link_info.check_access()) {
733 assert(current_klass.not_null() , "current_klass should not be null");
734
735 // check if method can be accessed by the referring class
736 check_method_accessability(current_klass,
737 resolved_klass,
738 KlassHandle(THREAD, resolved_method->method_holder()),
739 resolved_method,
740 CHECK_NULL);
741
742 // check loader constraints
743 check_method_loader_constraints(link_info, resolved_method, "method", CHECK_NULL);
744 }
745
746 return resolved_method;
747 }
748
749 static void trace_method_resolution(const char* prefix,
750 KlassHandle klass,
751 KlassHandle resolved_klass,
752 const methodHandle& method,
753 bool logitables,
754 int index = -1) {
755 #ifndef PRODUCT
756 ResourceMark rm;
757 outputStream* st;
758 if (logitables) {
759 st = LogHandle(itables)::trace_stream();
760 } else {
761 st = LogHandle(vtables)::trace_stream();
762 }
763 st->print("%s%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ",
764 prefix,
765 (klass.is_null() ? "<NULL>" : klass->internal_name()),
766 (resolved_klass.is_null() ? "<NULL>" : resolved_klass->internal_name()),
767 Method::name_and_sig_as_C_string(resolved_klass(),
768 method->name(),
769 method->signature()),
770 method->method_holder()->internal_name());
771 method->print_linkage_flags(st);
772 if (index != -1) {
773 st->print("vtable_index:%d", index);
774 }
775 st->cr();
776 #endif // PRODUCT
777 }
778
779 methodHandle LinkResolver::resolve_interface_method(const LinkInfo& link_info, Bytecodes::Code code, TRAPS) {
780
781 KlassHandle resolved_klass = link_info.resolved_klass();
782
783 // check if klass is interface
784 if (!resolved_klass->is_interface()) {
785 ResourceMark rm(THREAD);
786 char buf[200];
787 jio_snprintf(buf, sizeof(buf), "Found class %s, but interface was expected", resolved_klass()->external_name());
788 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
789 }
790
791 // lookup method in this interface or its super, java.lang.Object
792 // JDK8: also look for static methods
793 methodHandle resolved_method = lookup_method_in_klasses(link_info, false, true, CHECK_NULL);
794
795 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) {
796 // lookup method in all the super-interfaces
797 resolved_method = lookup_method_in_interfaces(link_info, CHECK_NULL);
798 }
799
800 if (resolved_method.is_null()) {
801 // no method found
802 ResourceMark rm(THREAD);
803 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(),
804 Method::name_and_sig_as_C_string(resolved_klass(),
805 link_info.name(),
806 link_info.signature()));
807 }
808
809 if (link_info.check_access()) {
810 // JDK8 adds non-public interface methods, and accessability check requirement
811 KlassHandle current_klass = link_info.current_klass();
812
813 assert(current_klass.not_null() , "current_klass should not be null");
814
815 // check if method can be accessed by the referring class
816 check_method_accessability(current_klass,
817 resolved_klass,
818 KlassHandle(THREAD, resolved_method->method_holder()),
819 resolved_method,
820 CHECK_NULL);
821
822 check_method_loader_constraints(link_info, resolved_method, "interface method", CHECK_NULL);
823 }
824
825 if (code != Bytecodes::_invokestatic && resolved_method->is_static()) {
826 ResourceMark rm(THREAD);
827 char buf[200];
828 jio_snprintf(buf, sizeof(buf), "Expected instance not static method %s",
829 Method::name_and_sig_as_C_string(resolved_klass(),
830 resolved_method->name(), resolved_method->signature()));
831 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
832 }
833
834 if (code == Bytecodes::_invokeinterface && resolved_method->is_private()) {
835 ResourceMark rm(THREAD);
836 char buf[200];
837
838 KlassHandle current_klass = link_info.current_klass();
839 jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokeinterface: method %s, caller-class:%s",
840 Method::name_and_sig_as_C_string(resolved_klass(),
841 resolved_method->name(),
842 resolved_method->signature()),
843 (current_klass.is_null() ? "<NULL>" : current_klass->internal_name()));
844 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
845 }
846
847 if (log_develop_is_enabled(Trace, itables)) {
848 trace_method_resolution("invokeinterface resolved method: caller-class",
849 link_info.current_klass(), resolved_klass,
850 resolved_method, true);
851 }
852
853 return resolved_method;
854 }
855
856 //------------------------------------------------------------------------------------------------------------------------
857 // Field resolution
858
859 void LinkResolver::check_field_accessability(KlassHandle ref_klass,
860 KlassHandle resolved_klass,
861 KlassHandle sel_klass,
862 const fieldDescriptor& fd,
863 TRAPS) {
864 if (!Reflection::verify_field_access(ref_klass(),
865 resolved_klass(),
866 sel_klass(),
867 fd.access_flags(),
868 true)) {
869 ResourceMark rm(THREAD);
870 Exceptions::fthrow(
871 THREAD_AND_LOCATION,
872 vmSymbols::java_lang_IllegalAccessError(),
873 "tried to access field %s.%s from class %s",
874 sel_klass->external_name(),
875 fd.name()->as_C_string(),
876 ref_klass->external_name()
877 );
878 return;
879 }
880 }
881
882 void LinkResolver::resolve_field_access(fieldDescriptor& fd, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) {
883 LinkInfo link_info(pool, index, CHECK);
884 resolve_field(fd, link_info, byte, true, CHECK);
885 }
886
887 void LinkResolver::resolve_field(fieldDescriptor& fd,
888 const LinkInfo& link_info,
889 Bytecodes::Code byte, bool initialize_class,
890 TRAPS) {
891 assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic ||
892 byte == Bytecodes::_getfield || byte == Bytecodes::_putfield ||
893 byte == Bytecodes::_nofast_getfield || byte == Bytecodes::_nofast_putfield ||
894 (byte == Bytecodes::_nop && !link_info.check_access()), "bad field access bytecode");
895
896 bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic);
897 bool is_put = (byte == Bytecodes::_putfield || byte == Bytecodes::_putstatic || byte == Bytecodes::_nofast_putfield);
898 // Check if there's a resolved klass containing the field
899 KlassHandle resolved_klass = link_info.resolved_klass();
900 Symbol* field = link_info.name();
901 Symbol* sig = link_info.signature();
902
903 if (resolved_klass.is_null()) {
904 ResourceMark rm(THREAD);
905 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
906 }
907
908 // Resolve instance field
909 KlassHandle sel_klass(THREAD, resolved_klass->find_field(field, sig, &fd));
910 // check if field exists; i.e., if a klass containing the field def has been selected
911 if (sel_klass.is_null()) {
912 ResourceMark rm(THREAD);
913 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
914 }
915
916 if (!link_info.check_access())
917 // Access checking may be turned off when calling from within the VM.
918 return;
919
920 // check access
921 KlassHandle current_klass = link_info.current_klass();
922 check_field_accessability(current_klass, resolved_klass, sel_klass, fd, CHECK);
923
924 // check for errors
925 if (is_static != fd.is_static()) {
926 ResourceMark rm(THREAD);
927 char msg[200];
928 jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", resolved_klass()->external_name(), fd.name()->as_C_string());
929 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg);
930 }
931
932 // Final fields can only be accessed from its own class.
933 if (is_put && fd.access_flags().is_final() && sel_klass() != current_klass()) {
934 THROW(vmSymbols::java_lang_IllegalAccessError());
935 }
936
937 // initialize resolved_klass if necessary
938 // note 1: the klass which declared the field must be initialized (i.e, sel_klass)
939 // according to the newest JVM spec (5.5, p.170) - was bug (gri 7/28/99)
940 //
941 // note 2: we don't want to force initialization if we are just checking
942 // if the field access is legal; e.g., during compilation
943 if (is_static && initialize_class) {
944 sel_klass->initialize(CHECK);
945 }
946
947 if (sel_klass() != current_klass()) {
948 check_field_loader_constraints(field, sig, current_klass, sel_klass, CHECK);
949 }
950
951 // return information. note that the klass is set to the actual klass containing the
952 // field, otherwise access of static fields in superclasses will not work.
953 }
954
955
956 //------------------------------------------------------------------------------------------------------------------------
957 // Invoke resolution
958 //
959 // Naming conventions:
960 //
961 // resolved_method the specified method (i.e., static receiver specified via constant pool index)
962 // sel_method the selected method (selected via run-time lookup; e.g., based on dynamic receiver class)
963 // resolved_klass the specified klass (i.e., specified via constant pool index)
964 // recv_klass the receiver klass
965
966
967 void LinkResolver::resolve_static_call(CallInfo& result,
968 const LinkInfo& link_info,
969 bool initialize_class, TRAPS) {
970 methodHandle resolved_method = linktime_resolve_static_method(link_info, CHECK);
971
972 // The resolved class can change as a result of this resolution.
973 KlassHandle resolved_klass = KlassHandle(THREAD, resolved_method->method_holder());
974
975 Method* save_resolved_method = resolved_method();
976 // Initialize klass (this should only happen if everything is ok)
977 if (initialize_class && resolved_klass->should_be_initialized()) {
978 resolved_klass->initialize(CHECK);
979 // Use updated LinkInfo (to reresolve with resolved_klass as method_holder?)
980 LinkInfo new_info(resolved_klass, link_info.name(), link_info.signature(),
981 link_info.current_klass(), link_info.check_access());
982 resolved_method = linktime_resolve_static_method(new_info, CHECK);
983 }
984
985 assert(save_resolved_method == resolved_method(), "does this change?");
986 // setup result
987 result.set_static(resolved_klass, resolved_method, CHECK);
988 }
989
990 // throws linktime exceptions
991 methodHandle LinkResolver::linktime_resolve_static_method(const LinkInfo& link_info, TRAPS) {
992
993 KlassHandle resolved_klass = link_info.resolved_klass();
994 methodHandle resolved_method;
995 if (!resolved_klass->is_interface()) {
996 resolved_method = resolve_method(link_info, /*require_methodref*/false, CHECK_NULL);
997 } else {
998 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokestatic, CHECK_NULL);
999 }
1000 assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier");
1001
1002 // check if static
1003 if (!resolved_method->is_static()) {
1004 ResourceMark rm(THREAD);
1005 char buf[200];
1006 jio_snprintf(buf, sizeof(buf), "Expected static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
1007 resolved_method->name(),
1008 resolved_method->signature()));
1009 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1010 }
1011 return resolved_method;
1012 }
1013
1014
1015 void LinkResolver::resolve_special_call(CallInfo& result,
1016 const LinkInfo& link_info,
1017 TRAPS) {
1018 methodHandle resolved_method = linktime_resolve_special_method(link_info, CHECK);
1019 runtime_resolve_special_method(result, resolved_method,
1020 link_info.resolved_klass(),
1021 link_info.current_klass(),
1022 link_info.check_access(), CHECK);
1023 }
1024
1025 // throws linktime exceptions
1026 methodHandle LinkResolver::linktime_resolve_special_method(const LinkInfo& link_info,
1027 TRAPS) {
1028
1029 // Invokespecial is called for multiple special reasons:
1030 // <init>
1031 // local private method invocation, for classes and interfaces
1032 // superclass.method, which can also resolve to a default method
1033 // and the selected method is recalculated relative to the direct superclass
1034 // superinterface.method, which explicitly does not check shadowing
1035 KlassHandle resolved_klass = link_info.resolved_klass();
1036 methodHandle resolved_method;
1037
1038 if (!resolved_klass->is_interface()) {
1039 resolved_method = resolve_method(link_info, /*require_methodref*/false, CHECK_NULL);
1040 } else {
1041 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokespecial, CHECK_NULL);
1042 }
1043
1044 // check if method name is <init>, that it is found in same klass as static type
1045 if (resolved_method->name() == vmSymbols::object_initializer_name() &&
1046 resolved_method->method_holder() != resolved_klass()) {
1047 ResourceMark rm(THREAD);
1048 Exceptions::fthrow(
1049 THREAD_AND_LOCATION,
1050 vmSymbols::java_lang_NoSuchMethodError(),
1051 "%s: method %s%s not found",
1052 resolved_klass->external_name(),
1053 resolved_method->name()->as_C_string(),
1054 resolved_method->signature()->as_C_string()
1055 );
1056 return NULL;
1057 }
1058
1059 // check if invokespecial's interface method reference is in an indirect superinterface
1060 KlassHandle current_klass = link_info.current_klass();
1061 if (!current_klass.is_null() && resolved_klass->is_interface()) {
1062 Klass *klass_to_check = !InstanceKlass::cast(current_klass())->is_anonymous() ?
1063 current_klass() :
1064 InstanceKlass::cast(current_klass())->host_klass();
1065 // Disable verification for the dynamically-generated reflection bytecodes.
1066 bool is_reflect = klass_to_check->is_subclass_of(
1067 SystemDictionary::reflect_MagicAccessorImpl_klass());
1068
1069 if (!is_reflect &&
1070 !InstanceKlass::cast(klass_to_check)->is_same_or_direct_interface(resolved_klass())) {
1071 ResourceMark rm(THREAD);
1072 char buf[200];
1073 jio_snprintf(buf, sizeof(buf),
1074 "Interface method reference: %s, is in an indirect superinterface of %s",
1075 Method::name_and_sig_as_C_string(resolved_klass(),
1076 resolved_method->name(),
1077 resolved_method->signature()),
1078 current_klass->external_name());
1079 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1080 }
1081 }
1082
1083 // check if not static
1084 if (resolved_method->is_static()) {
1085 ResourceMark rm(THREAD);
1086 char buf[200];
1087 jio_snprintf(buf, sizeof(buf),
1088 "Expecting non-static method %s",
1089 Method::name_and_sig_as_C_string(resolved_klass(),
1090 resolved_method->name(),
1091 resolved_method->signature()));
1092 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1093 }
1094
1095 if (log_develop_is_enabled(Trace, itables)) {
1096 trace_method_resolution("invokespecial resolved method: caller-class:",
1097 current_klass, resolved_klass, resolved_method, true);
1098 }
1099
1100 return resolved_method;
1101 }
1102
1103 // throws runtime exceptions
1104 void LinkResolver::runtime_resolve_special_method(CallInfo& result,
1105 const methodHandle& resolved_method,
1106 KlassHandle resolved_klass,
1107 KlassHandle current_klass,
1108 bool check_access, TRAPS) {
1109
1110 // resolved method is selected method unless we have an old-style lookup
1111 // for a superclass method
1112 // Invokespecial for a superinterface, resolved method is selected method,
1113 // no checks for shadowing
1114 methodHandle sel_method(THREAD, resolved_method());
1115
1116 // check if this is an old-style super call and do a new lookup if so
1117 { KlassHandle method_klass = KlassHandle(THREAD,
1118 resolved_method->method_holder());
1119
1120 if (check_access &&
1121 // a) check if ACC_SUPER flag is set for the current class
1122 (current_klass->is_super() || !AllowNonVirtualCalls) &&
1123 // b) check if the class of the resolved_klass is a superclass
1124 // (not supertype in order to exclude interface classes) of the current class.
1125 // This check is not performed for super.invoke for interface methods
1126 // in super interfaces.
1127 current_klass->is_subclass_of(resolved_klass()) &&
1128 current_klass() != resolved_klass() &&
1129 // c) check if the method is not <init>
1130 resolved_method->name() != vmSymbols::object_initializer_name()) {
1131 // Lookup super method
1132 KlassHandle super_klass(THREAD, current_klass->super());
1133 sel_method = lookup_instance_method_in_klasses(super_klass,
1134 resolved_method->name(),
1135 resolved_method->signature(), CHECK);
1136 // check if found
1137 if (sel_method.is_null()) {
1138 ResourceMark rm(THREAD);
1139 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1140 Method::name_and_sig_as_C_string(resolved_klass(),
1141 resolved_method->name(),
1142 resolved_method->signature()));
1143 }
1144 }
1145 }
1146
1147 // check if not static
1148 if (sel_method->is_static()) {
1149 ResourceMark rm(THREAD);
1150 char buf[200];
1151 jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
1152 resolved_method->name(),
1153 resolved_method->signature()));
1154 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1155 }
1156
1157 // check if abstract
1158 if (sel_method->is_abstract()) {
1159 ResourceMark rm(THREAD);
1160 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1161 Method::name_and_sig_as_C_string(resolved_klass(),
1162 sel_method->name(),
1163 sel_method->signature()));
1164 }
1165
1166 if (log_develop_is_enabled(Trace, itables)) {
1167 trace_method_resolution("invokespecial selected method: resolved-class:",
1168 resolved_klass, resolved_klass, sel_method, true);
1169 }
1170
1171 // setup result
1172 result.set_static(resolved_klass, sel_method, CHECK);
1173 }
1174
1175 void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, KlassHandle receiver_klass,
1176 const LinkInfo& link_info,
1177 bool check_null_and_abstract, TRAPS) {
1178 methodHandle resolved_method = linktime_resolve_virtual_method(link_info, CHECK);
1179 runtime_resolve_virtual_method(result, resolved_method,
1180 link_info.resolved_klass(),
1181 recv, receiver_klass,
1182 check_null_and_abstract, CHECK);
1183 }
1184
1185 // throws linktime exceptions
1186 methodHandle LinkResolver::linktime_resolve_virtual_method(const LinkInfo& link_info,
1187 TRAPS) {
1188 // normal method resolution
1189 methodHandle resolved_method = resolve_method(link_info, /*require_methodref*/true, CHECK_NULL);
1190
1191 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1192 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1193
1194 // check if private interface method
1195 KlassHandle resolved_klass = link_info.resolved_klass();
1196 KlassHandle current_klass = link_info.current_klass();
1197
1198 if (resolved_klass->is_interface() && resolved_method->is_private()) {
1199 ResourceMark rm(THREAD);
1200 char buf[200];
1201 jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokevirtual: method %s, caller-class:%s",
1202 Method::name_and_sig_as_C_string(resolved_klass(),
1203 resolved_method->name(),
1204 resolved_method->signature()),
1205 (current_klass.is_null() ? "<NULL>" : current_klass->internal_name()));
1206 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1207 }
1208
1209 // check if not static
1210 if (resolved_method->is_static()) {
1211 ResourceMark rm(THREAD);
1212 char buf[200];
1213 jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
1214 resolved_method->name(),
1215 resolved_method->signature()));
1216 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1217 }
1218
1219 if (log_develop_is_enabled(Trace, vtables)) {
1220 trace_method_resolution("invokevirtual resolved method: caller-class:",
1221 current_klass, resolved_klass, resolved_method, false);
1222 }
1223
1224 return resolved_method;
1225 }
1226
1227 // throws runtime exceptions
1228 void LinkResolver::runtime_resolve_virtual_method(CallInfo& result,
1229 const methodHandle& resolved_method,
1230 KlassHandle resolved_klass,
1231 Handle recv,
1232 KlassHandle recv_klass,
1233 bool check_null_and_abstract,
1234 TRAPS) {
1235
1236 // setup default return values
1237 int vtable_index = Method::invalid_vtable_index;
1238 methodHandle selected_method;
1239
1240 assert(recv.is_null() || recv->is_oop(), "receiver is not an oop");
1241
1242 // runtime method resolution
1243 if (check_null_and_abstract && recv.is_null()) { // check if receiver exists
1244 THROW(vmSymbols::java_lang_NullPointerException());
1245 }
1246
1247 // Virtual methods cannot be resolved before its klass has been linked, for otherwise the Method*'s
1248 // has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since
1249 // a missing receiver might result in a bogus lookup.
1250 assert(resolved_method->method_holder()->is_linked(), "must be linked");
1251
1252 // do lookup based on receiver klass using the vtable index
1253 if (resolved_method->method_holder()->is_interface()) { // default or miranda method
1254 vtable_index = vtable_index_of_interface_method(resolved_klass,
1255 resolved_method);
1256 assert(vtable_index >= 0 , "we should have valid vtable index at this point");
1257
1258 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1259 } else {
1260 // at this point we are sure that resolved_method is virtual and not
1261 // a default or miranda method; therefore, it must have a valid vtable index.
1262 assert(!resolved_method->has_itable_index(), "");
1263 vtable_index = resolved_method->vtable_index();
1264 // We could get a negative vtable_index for final methods,
1265 // because as an optimization they are they are never put in the vtable,
1266 // unless they override an existing method.
1267 // If we do get a negative, it means the resolved method is the the selected
1268 // method, and it can never be changed by an override.
1269 if (vtable_index == Method::nonvirtual_vtable_index) {
1270 assert(resolved_method->can_be_statically_bound(), "cannot override this method");
1271 selected_method = resolved_method;
1272 } else {
1273 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1274 }
1275 }
1276
1277 // check if method exists
1278 if (selected_method.is_null()) {
1279 ResourceMark rm(THREAD);
1280 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1281 Method::name_and_sig_as_C_string(resolved_klass(),
1282 resolved_method->name(),
1283 resolved_method->signature()));
1284 }
1285
1286 // check if abstract
1287 if (check_null_and_abstract && selected_method->is_abstract()) {
1288 ResourceMark rm(THREAD);
1289 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1290 Method::name_and_sig_as_C_string(resolved_klass(),
1291 selected_method->name(),
1292 selected_method->signature()));
1293 }
1294
1295 if (log_develop_is_enabled(Trace, vtables)) {
1296 trace_method_resolution("invokevirtual selected method: receiver-class:",
1297 recv_klass, resolved_klass, selected_method,
1298 false, vtable_index);
1299 }
1300 // setup result
1301 result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK);
1302 }
1303
1304 void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, KlassHandle recv_klass,
1305 const LinkInfo& link_info,
1306 bool check_null_and_abstract, TRAPS) {
1307 // throws linktime exceptions
1308 methodHandle resolved_method = linktime_resolve_interface_method(link_info, CHECK);
1309 runtime_resolve_interface_method(result, resolved_method,link_info.resolved_klass(),
1310 recv, recv_klass, check_null_and_abstract, CHECK);
1311 }
1312
1313 methodHandle LinkResolver::linktime_resolve_interface_method(const LinkInfo& link_info,
1314 TRAPS) {
1315 // normal interface method resolution
1316 methodHandle resolved_method = resolve_interface_method(link_info, Bytecodes::_invokeinterface, CHECK_NULL);
1317 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1318 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1319
1320 return resolved_method;
1321 }
1322
1323 // throws runtime exceptions
1324 void LinkResolver::runtime_resolve_interface_method(CallInfo& result,
1325 const methodHandle& resolved_method,
1326 KlassHandle resolved_klass,
1327 Handle recv,
1328 KlassHandle recv_klass,
1329 bool check_null_and_abstract, TRAPS) {
1330 // check if receiver exists
1331 if (check_null_and_abstract && recv.is_null()) {
1332 THROW(vmSymbols::java_lang_NullPointerException());
1333 }
1334
1335 // check if receiver klass implements the resolved interface
1336 if (!recv_klass->is_subtype_of(resolved_klass())) {
1337 ResourceMark rm(THREAD);
1338 char buf[200];
1339 jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s",
1340 recv_klass()->external_name(),
1341 resolved_klass()->external_name());
1342 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1343 }
1344
1345 // do lookup based on receiver klass
1346 // This search must match the linktime preparation search for itable initialization
1347 // to correctly enforce loader constraints for interface method inheritance
1348 methodHandle sel_method = lookup_instance_method_in_klasses(recv_klass,
1349 resolved_method->name(),
1350 resolved_method->signature(), CHECK);
1351 if (sel_method.is_null() && !check_null_and_abstract) {
1352 // In theory this is a harmless placeholder value, but
1353 // in practice leaving in null affects the nsk default method tests.
1354 // This needs further study.
1355 sel_method = resolved_method;
1356 }
1357 // check if method exists
1358 if (sel_method.is_null()) {
1359 ResourceMark rm(THREAD);
1360 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1361 Method::name_and_sig_as_C_string(recv_klass(),
1362 resolved_method->name(),
1363 resolved_method->signature()));
1364 }
1365 // check access
1366 // Throw Illegal Access Error if sel_method is not public.
1367 if (!sel_method->is_public()) {
1368 ResourceMark rm(THREAD);
1369 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(),
1370 Method::name_and_sig_as_C_string(recv_klass(),
1371 sel_method->name(),
1372 sel_method->signature()));
1373 }
1374 // check if abstract
1375 if (check_null_and_abstract && sel_method->is_abstract()) {
1376 ResourceMark rm(THREAD);
1377 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1378 Method::name_and_sig_as_C_string(recv_klass(),
1379 sel_method->name(),
1380 sel_method->signature()));
1381 }
1382
1383 if (log_develop_is_enabled(Trace, itables)) {
1384 trace_method_resolution("invokeinterface selected method: receiver-class",
1385 recv_klass, resolved_klass, sel_method, true);
1386 }
1387 // setup result
1388 if (!resolved_method->has_itable_index()) {
1389 int vtable_index = resolved_method->vtable_index();
1390 assert(vtable_index == sel_method->vtable_index(), "sanity check");
1391 result.set_virtual(resolved_klass, recv_klass, resolved_method, sel_method, vtable_index, CHECK);
1392 } else {
1393 int itable_index = resolved_method()->itable_index();
1394 result.set_interface(resolved_klass, recv_klass, resolved_method, sel_method, itable_index, CHECK);
1395 }
1396 }
1397
1398
1399 methodHandle LinkResolver::linktime_resolve_interface_method_or_null(
1400 const LinkInfo& link_info) {
1401 EXCEPTION_MARK;
1402 methodHandle method_result = linktime_resolve_interface_method(link_info, THREAD);
1403 if (HAS_PENDING_EXCEPTION) {
1404 CLEAR_PENDING_EXCEPTION;
1405 return methodHandle();
1406 } else {
1407 return method_result;
1408 }
1409 }
1410
1411 methodHandle LinkResolver::linktime_resolve_virtual_method_or_null(
1412 const LinkInfo& link_info) {
1413 EXCEPTION_MARK;
1414 methodHandle method_result = linktime_resolve_virtual_method(link_info, THREAD);
1415 if (HAS_PENDING_EXCEPTION) {
1416 CLEAR_PENDING_EXCEPTION;
1417 return methodHandle();
1418 } else {
1419 return method_result;
1420 }
1421 }
1422
1423 methodHandle LinkResolver::resolve_virtual_call_or_null(
1424 KlassHandle receiver_klass,
1425 const LinkInfo& link_info) {
1426 EXCEPTION_MARK;
1427 CallInfo info;
1428 resolve_virtual_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1429 if (HAS_PENDING_EXCEPTION) {
1430 CLEAR_PENDING_EXCEPTION;
1431 return methodHandle();
1432 }
1433 return info.selected_method();
1434 }
1435
1436 methodHandle LinkResolver::resolve_interface_call_or_null(
1437 KlassHandle receiver_klass,
1438 const LinkInfo& link_info) {
1439 EXCEPTION_MARK;
1440 CallInfo info;
1441 resolve_interface_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1442 if (HAS_PENDING_EXCEPTION) {
1443 CLEAR_PENDING_EXCEPTION;
1444 return methodHandle();
1445 }
1446 return info.selected_method();
1447 }
1448
1449 int LinkResolver::resolve_virtual_vtable_index(KlassHandle receiver_klass,
1450 const LinkInfo& link_info) {
1451 EXCEPTION_MARK;
1452 CallInfo info;
1453 resolve_virtual_call(info, Handle(), receiver_klass, link_info,
1454 /*check_null_or_abstract*/false, THREAD);
1455 if (HAS_PENDING_EXCEPTION) {
1456 CLEAR_PENDING_EXCEPTION;
1457 return Method::invalid_vtable_index;
1458 }
1459 return info.vtable_index();
1460 }
1461
1462 methodHandle LinkResolver::resolve_static_call_or_null(const LinkInfo& link_info) {
1463 EXCEPTION_MARK;
1464 CallInfo info;
1465 resolve_static_call(info, link_info, /*initialize_class*/false, THREAD);
1466 if (HAS_PENDING_EXCEPTION) {
1467 CLEAR_PENDING_EXCEPTION;
1468 return methodHandle();
1469 }
1470 return info.selected_method();
1471 }
1472
1473 methodHandle LinkResolver::resolve_special_call_or_null(const LinkInfo& link_info) {
1474 EXCEPTION_MARK;
1475 CallInfo info;
1476 resolve_special_call(info, link_info, THREAD);
1477 if (HAS_PENDING_EXCEPTION) {
1478 CLEAR_PENDING_EXCEPTION;
1479 return methodHandle();
1480 }
1481 return info.selected_method();
1482 }
1483
1484
1485
1486 //------------------------------------------------------------------------------------------------------------------------
1487 // ConstantPool entries
1488
1489 void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) {
1490 switch (byte) {
1491 case Bytecodes::_invokestatic : resolve_invokestatic (result, pool, index, CHECK); break;
1492 case Bytecodes::_invokespecial : resolve_invokespecial (result, pool, index, CHECK); break;
1493 case Bytecodes::_invokevirtual : resolve_invokevirtual (result, recv, pool, index, CHECK); break;
1494 case Bytecodes::_invokehandle : resolve_invokehandle (result, pool, index, CHECK); break;
1495 case Bytecodes::_invokedynamic : resolve_invokedynamic (result, pool, index, CHECK); break;
1496 case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break;
1497 }
1498 return;
1499 }
1500
1501 void LinkResolver::resolve_invoke(CallInfo& result, Handle& recv,
1502 const methodHandle& attached_method,
1503 Bytecodes::Code byte, TRAPS) {
1504 KlassHandle defc = attached_method->method_holder();
1505 Symbol* name = attached_method->name();
1506 Symbol* type = attached_method->signature();
1507 LinkInfo link_info(defc, name, type, KlassHandle(), /*check_access=*/false);
1508 switch(byte) {
1509 case Bytecodes::_invokevirtual:
1510 resolve_virtual_call(result, recv, recv->klass(), link_info,
1511 /*check_null_and_abstract=*/true, CHECK);
1512 break;
1513 case Bytecodes::_invokeinterface:
1514 resolve_interface_call(result, recv, recv->klass(), link_info,
1515 /*check_null_and_abstract=*/true, CHECK);
1516 break;
1517 case Bytecodes::_invokestatic:
1518 resolve_static_call(result, link_info, /*initialize_class=*/false, CHECK);
1519 break;
1520 case Bytecodes::_invokespecial:
1521 resolve_special_call(result, link_info, CHECK);
1522 break;
1523 default:
1524 fatal("bad call: %s", Bytecodes::name(byte));
1525 }
1526 }
1527
1528 void LinkResolver::resolve_invokestatic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1529 LinkInfo link_info(pool, index, CHECK);
1530 resolve_static_call(result, link_info, /*initialize_class*/true, CHECK);
1531 }
1532
1533
1534 void LinkResolver::resolve_invokespecial(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1535 LinkInfo link_info(pool, index, CHECK);
1536 resolve_special_call(result, link_info, CHECK);
1537 }
1538
1539
1540 void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv,
1541 const constantPoolHandle& pool, int index,
1542 TRAPS) {
1543
1544 LinkInfo link_info(pool, index, CHECK);
1545 KlassHandle recvrKlass (THREAD, recv.is_null() ? (Klass*)NULL : recv->klass());
1546 resolve_virtual_call(result, recv, recvrKlass, link_info, /*check_null_or_abstract*/true, CHECK);
1547 }
1548
1549
1550 void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, TRAPS) {
1551 LinkInfo link_info(pool, index, CHECK);
1552 KlassHandle recvrKlass (THREAD, recv.is_null() ? (Klass*)NULL : recv->klass());
1553 resolve_interface_call(result, recv, recvrKlass, link_info, true, CHECK);
1554 }
1555
1556
1557 void LinkResolver::resolve_invokehandle(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1558 // This guy is reached from InterpreterRuntime::resolve_invokehandle.
1559 LinkInfo link_info(pool, index, CHECK);
1560 if (TraceMethodHandles) {
1561 ResourceMark rm(THREAD);
1562 tty->print_cr("resolve_invokehandle %s %s", link_info.name()->as_C_string(),
1563 link_info.signature()->as_C_string());
1564 }
1565 resolve_handle_call(result, link_info, CHECK);
1566 }
1567
1568 void LinkResolver::resolve_handle_call(CallInfo& result,
1569 const LinkInfo& link_info,
1570 TRAPS) {
1571 // JSR 292: this must be an implicitly generated method MethodHandle.invokeExact(*...) or similar
1572 KlassHandle resolved_klass = link_info.resolved_klass();
1573 assert(resolved_klass() == SystemDictionary::MethodHandle_klass() ||
1574 resolved_klass() == SystemDictionary::VarHandle_klass(), "");
1575 assert(MethodHandles::is_signature_polymorphic_name(link_info.name()), "");
1576 Handle resolved_appendix;
1577 Handle resolved_method_type;
1578 methodHandle resolved_method = lookup_polymorphic_method(link_info,
1579 &resolved_appendix, &resolved_method_type, CHECK);
1580 result.set_handle(resolved_klass, resolved_method, resolved_appendix, resolved_method_type, CHECK);
1581 }
1582
1583 static void wrap_invokedynamic_exception(TRAPS) {
1584 if (HAS_PENDING_EXCEPTION) {
1585 if (TraceMethodHandles) {
1586 tty->print_cr("invokedynamic throws BSME for " INTPTR_FORMAT, p2i((void *)PENDING_EXCEPTION));
1587 PENDING_EXCEPTION->print();
1588 }
1589 if (PENDING_EXCEPTION->is_a(SystemDictionary::BootstrapMethodError_klass())) {
1590 // throw these guys, since they are already wrapped
1591 return;
1592 }
1593 if (!PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1594 // intercept only LinkageErrors which might have failed to wrap
1595 return;
1596 }
1597 // See the "Linking Exceptions" section for the invokedynamic instruction in the JVMS.
1598 Handle nested_exception(THREAD, PENDING_EXCEPTION);
1599 CLEAR_PENDING_EXCEPTION;
1600 THROW_CAUSE(vmSymbols::java_lang_BootstrapMethodError(), nested_exception)
1601 }
1602 }
1603
1604 void LinkResolver::resolve_invokedynamic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1605 Symbol* method_name = pool->name_ref_at(index);
1606 Symbol* method_signature = pool->signature_ref_at(index);
1607 KlassHandle current_klass = KlassHandle(THREAD, pool->pool_holder());
1608
1609 // Resolve the bootstrap specifier (BSM + optional arguments).
1610 Handle bootstrap_specifier;
1611 // Check if CallSite has been bound already:
1612 ConstantPoolCacheEntry* cpce = pool->invokedynamic_cp_cache_entry_at(index);
1613 if (cpce->is_f1_null()) {
1614 int pool_index = cpce->constant_pool_index();
1615 oop bsm_info = pool->resolve_bootstrap_specifier_at(pool_index, THREAD);
1616 wrap_invokedynamic_exception(CHECK);
1617 assert(bsm_info != NULL, "");
1618 // FIXME: Cache this once per BootstrapMethods entry, not once per CONSTANT_InvokeDynamic.
1619 bootstrap_specifier = Handle(THREAD, bsm_info);
1620 }
1621 if (!cpce->is_f1_null()) {
1622 methodHandle method( THREAD, cpce->f1_as_method());
1623 Handle appendix( THREAD, cpce->appendix_if_resolved(pool));
1624 Handle method_type(THREAD, cpce->method_type_if_resolved(pool));
1625 result.set_handle(method, appendix, method_type, THREAD);
1626 wrap_invokedynamic_exception(CHECK);
1627 return;
1628 }
1629
1630 if (TraceMethodHandles) {
1631 ResourceMark rm(THREAD);
1632 tty->print_cr("resolve_invokedynamic #%d %s %s in %s",
1633 ConstantPool::decode_invokedynamic_index(index),
1634 method_name->as_C_string(), method_signature->as_C_string(),
1635 current_klass->name()->as_C_string());
1636 tty->print(" BSM info: "); bootstrap_specifier->print();
1637 }
1638
1639 resolve_dynamic_call(result, bootstrap_specifier, method_name, method_signature, current_klass, CHECK);
1640 }
1641
1642 void LinkResolver::resolve_dynamic_call(CallInfo& result,
1643 Handle bootstrap_specifier,
1644 Symbol* method_name, Symbol* method_signature,
1645 KlassHandle current_klass,
1646 TRAPS) {
1647 // JSR 292: this must resolve to an implicitly generated method MH.linkToCallSite(*...)
1648 // The appendix argument is likely to be a freshly-created CallSite.
1649 Handle resolved_appendix;
1650 Handle resolved_method_type;
1651 methodHandle resolved_method =
1652 SystemDictionary::find_dynamic_call_site_invoker(current_klass,
1653 bootstrap_specifier,
1654 method_name, method_signature,
1655 &resolved_appendix,
1656 &resolved_method_type,
1657 THREAD);
1658 wrap_invokedynamic_exception(CHECK);
1659 result.set_handle(resolved_method, resolved_appendix, resolved_method_type, THREAD);
1660 wrap_invokedynamic_exception(CHECK);
1661 }