1 /*
2 * Copyright (c) 1997, 2020, 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 "jvm.h"
27 #include "classfile/defaultMethods.hpp"
28 #include "classfile/javaClasses.hpp"
29 #include "classfile/resolutionErrors.hpp"
30 #include "classfile/symbolTable.hpp"
31 #include "classfile/systemDictionary.hpp"
32 #include "classfile/vmSymbols.hpp"
33 #include "compiler/compilationPolicy.hpp"
34 #include "compiler/compileBroker.hpp"
35 #include "gc/shared/collectedHeap.inline.hpp"
36 #include "interpreter/bootstrapInfo.hpp"
37 #include "interpreter/bytecode.hpp"
38 #include "interpreter/interpreterRuntime.hpp"
39 #include "interpreter/linkResolver.hpp"
40 #include "logging/log.hpp"
41 #include "logging/logStream.hpp"
42 #include "memory/resourceArea.hpp"
43 #include "oops/constantPool.hpp"
44 #include "oops/cpCache.inline.hpp"
45 #include "oops/instanceKlass.hpp"
46 #include "oops/method.hpp"
47 #include "oops/objArrayKlass.hpp"
48 #include "oops/objArrayOop.hpp"
49 #include "oops/oop.inline.hpp"
50 #include "prims/methodHandles.hpp"
51 #include "prims/nativeLookup.hpp"
52 #include "runtime/fieldDescriptor.inline.hpp"
53 #include "runtime/frame.inline.hpp"
54 #include "runtime/handles.inline.hpp"
55 #include "runtime/reflection.hpp"
56 #include "runtime/safepointVerifiers.hpp"
57 #include "runtime/signature.hpp"
58 #include "runtime/thread.inline.hpp"
59 #include "runtime/vmThread.hpp"
60
61 //------------------------------------------------------------------------------------------------------------------------
62 // Implementation of CallInfo
63
64
65 void CallInfo::set_static(Klass* resolved_klass, const methodHandle& resolved_method, TRAPS) {
66 int vtable_index = Method::nonvirtual_vtable_index;
67 set_common(resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK);
68 }
69
70
71 void CallInfo::set_interface(Klass* resolved_klass,
72 const methodHandle& resolved_method,
73 const methodHandle& selected_method,
74 int itable_index, TRAPS) {
75 // This is only called for interface methods. If the resolved_method
76 // comes from java/lang/Object, it can be the subject of a virtual call, so
77 // we should pick the vtable index from the resolved method.
78 // In that case, the caller must call set_virtual instead of set_interface.
79 assert(resolved_method->method_holder()->is_interface(), "");
80 assert(itable_index == resolved_method()->itable_index(), "");
81 set_common(resolved_klass, resolved_method, selected_method, CallInfo::itable_call, itable_index, CHECK);
82 }
83
84 void CallInfo::set_virtual(Klass* resolved_klass,
85 const methodHandle& resolved_method,
86 const methodHandle& selected_method,
87 int vtable_index, TRAPS) {
88 assert(vtable_index >= 0 || vtable_index == Method::nonvirtual_vtable_index, "valid index");
89 assert(vtable_index < 0 || !resolved_method->has_vtable_index() || vtable_index == resolved_method->vtable_index(), "");
90 CallKind kind = (vtable_index >= 0 && !resolved_method->can_be_statically_bound() ? CallInfo::vtable_call : CallInfo::direct_call);
91 set_common(resolved_klass, resolved_method, selected_method, kind, vtable_index, CHECK);
92 assert(!resolved_method->is_compiled_lambda_form(), "these must be handled via an invokehandle call");
93 }
94
95 void CallInfo::set_handle(const methodHandle& resolved_method,
96 Handle resolved_appendix, TRAPS) {
97 set_handle(SystemDictionary::MethodHandle_klass(), resolved_method, resolved_appendix, CHECK);
98 }
99
100 void CallInfo::set_handle(Klass* resolved_klass,
101 const methodHandle& resolved_method,
102 Handle resolved_appendix, TRAPS) {
103 guarantee(resolved_method.not_null(), "resolved method is null");
104 assert(resolved_method->intrinsic_id() == vmIntrinsics::_invokeBasic ||
105 resolved_method->is_compiled_lambda_form(),
106 "linkMethod must return one of these");
107 int vtable_index = Method::nonvirtual_vtable_index;
108 assert(!resolved_method->has_vtable_index(), "");
109 set_common(resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK);
110 _resolved_appendix = resolved_appendix;
111 }
112
113 void CallInfo::set_common(Klass* resolved_klass,
114 const methodHandle& resolved_method,
115 const methodHandle& selected_method,
116 CallKind kind,
117 int index,
118 TRAPS) {
119 assert(resolved_method->signature() == selected_method->signature(), "signatures must correspond");
120 _resolved_klass = resolved_klass;
121 _resolved_method = resolved_method;
122 _selected_method = selected_method;
123 _call_kind = kind;
124 _call_index = index;
125 _resolved_appendix = Handle();
126 DEBUG_ONLY(verify()); // verify before making side effects
127
128 CompilationPolicy::compile_if_required(selected_method, THREAD);
129 }
130
131 // utility query for unreflecting a method
132 CallInfo::CallInfo(Method* resolved_method, Klass* resolved_klass, TRAPS) {
133 Klass* resolved_method_holder = resolved_method->method_holder();
134 if (resolved_klass == NULL) { // 2nd argument defaults to holder of 1st
135 resolved_klass = resolved_method_holder;
136 }
137 _resolved_klass = resolved_klass;
138 _resolved_method = methodHandle(THREAD, resolved_method);
139 _selected_method = methodHandle(THREAD, resolved_method);
140 // classify:
141 CallKind kind = CallInfo::unknown_kind;
142 int index = resolved_method->vtable_index();
143 if (resolved_method->can_be_statically_bound()) {
144 kind = CallInfo::direct_call;
145 } else if (!resolved_method_holder->is_interface()) {
146 // Could be an Object method inherited into an interface, but still a vtable call.
147 kind = CallInfo::vtable_call;
148 } else if (!resolved_klass->is_interface()) {
149 // A default or miranda method. Compute the vtable index.
150 index = LinkResolver::vtable_index_of_interface_method(resolved_klass,
151 _resolved_method);
152 assert(index >= 0 , "we should have valid vtable index at this point");
153
154 kind = CallInfo::vtable_call;
155 } else if (resolved_method->has_vtable_index()) {
156 // Can occur if an interface redeclares a method of Object.
157
158 #ifdef ASSERT
159 // Ensure that this is really the case.
160 Klass* object_klass = SystemDictionary::Object_klass();
161 Method * object_resolved_method = object_klass->vtable().method_at(index);
162 assert(object_resolved_method->name() == resolved_method->name(),
163 "Object and interface method names should match at vtable index %d, %s != %s",
164 index, object_resolved_method->name()->as_C_string(), resolved_method->name()->as_C_string());
165 assert(object_resolved_method->signature() == resolved_method->signature(),
166 "Object and interface method signatures should match at vtable index %d, %s != %s",
167 index, object_resolved_method->signature()->as_C_string(), resolved_method->signature()->as_C_string());
168 #endif // ASSERT
169
170 kind = CallInfo::vtable_call;
171 } else {
172 // A regular interface call.
173 kind = CallInfo::itable_call;
174 index = resolved_method->itable_index();
175 }
176 assert(index == Method::nonvirtual_vtable_index || index >= 0, "bad index %d", index);
177 _call_kind = kind;
178 _call_index = index;
179 _resolved_appendix = Handle();
180 // Find or create a ResolvedMethod instance for this Method*
181 set_resolved_method_name(CHECK);
182
183 DEBUG_ONLY(verify());
184 }
185
186 void CallInfo::set_resolved_method_name(TRAPS) {
187 assert(_resolved_method() != NULL, "Should already have a Method*");
188 oop rmethod_name = java_lang_invoke_ResolvedMethodName::find_resolved_method(_resolved_method, CHECK);
189 _resolved_method_name = Handle(THREAD, rmethod_name);
190 }
191
192 #ifdef ASSERT
193 void CallInfo::verify() {
194 switch (call_kind()) { // the meaning and allowed value of index depends on kind
195 case CallInfo::direct_call:
196 if (_call_index == Method::nonvirtual_vtable_index) break;
197 // else fall through to check vtable index:
198 case CallInfo::vtable_call:
199 assert(resolved_klass()->verify_vtable_index(_call_index), "");
200 break;
201 case CallInfo::itable_call:
202 assert(resolved_method()->method_holder()->verify_itable_index(_call_index), "");
203 break;
204 case CallInfo::unknown_kind:
205 assert(call_kind() != CallInfo::unknown_kind, "CallInfo must be set");
206 break;
207 default:
208 fatal("Unexpected call kind %d", call_kind());
209 }
210 }
211 #endif // ASSERT
212
213 #ifndef PRODUCT
214 void CallInfo::print() {
215 ResourceMark rm;
216 const char* kindstr;
217 switch (_call_kind) {
218 case direct_call: kindstr = "direct"; break;
219 case vtable_call: kindstr = "vtable"; break;
220 case itable_call: kindstr = "itable"; break;
221 default : kindstr = "unknown"; break;
222 }
223 tty->print_cr("Call %s@%d %s", kindstr, _call_index,
224 _resolved_method.is_null() ? "(none)" : _resolved_method->name_and_sig_as_C_string());
225 }
226 #endif
227
228 //------------------------------------------------------------------------------------------------------------------------
229 // Implementation of LinkInfo
230
231 LinkInfo::LinkInfo(const constantPoolHandle& pool, int index, const methodHandle& current_method, TRAPS) {
232 // resolve klass
233 _resolved_klass = pool->klass_ref_at(index, CHECK);
234
235 // Get name, signature, and static klass
236 _name = pool->name_ref_at(index);
237 _signature = pool->signature_ref_at(index);
238 _tag = pool->tag_ref_at(index);
239 _current_klass = pool->pool_holder();
240 _current_method = current_method;
241
242 // Coming from the constant pool always checks access
243 _check_access = true;
244 }
245
246 LinkInfo::LinkInfo(const constantPoolHandle& pool, int index, TRAPS) {
247 // resolve klass
248 _resolved_klass = pool->klass_ref_at(index, CHECK);
249
250 // Get name, signature, and static klass
251 _name = pool->name_ref_at(index);
252 _signature = pool->signature_ref_at(index);
253 _tag = pool->tag_ref_at(index);
254 _current_klass = pool->pool_holder();
255 _current_method = methodHandle();
256
257 // Coming from the constant pool always checks access
258 _check_access = true;
259 }
260
261 #ifndef PRODUCT
262 void LinkInfo::print() {
263 ResourceMark rm;
264 tty->print_cr("Link resolved_klass=%s name=%s signature=%s current_klass=%s check_access=%s",
265 _resolved_klass->name()->as_C_string(),
266 _name->as_C_string(),
267 _signature->as_C_string(),
268 _current_klass == NULL ? "(none)" : _current_klass->name()->as_C_string(),
269 _check_access ? "true" : "false");
270 }
271 #endif // PRODUCT
272 //------------------------------------------------------------------------------------------------------------------------
273 // Klass resolution
274
275 void LinkResolver::check_klass_accessibility(Klass* ref_klass, Klass* sel_klass, TRAPS) {
276 Klass* base_klass = sel_klass;
277 if (sel_klass->is_objArray_klass()) {
278 base_klass = ObjArrayKlass::cast(sel_klass)->bottom_klass();
279 }
280 // The element type could be a typeArray - we only need the access
281 // check if it is a reference to another class.
282 if (!base_klass->is_instance_klass()) {
283 return; // no relevant check to do
284 }
285
286 Reflection::VerifyClassAccessResults vca_result =
287 Reflection::verify_class_access(ref_klass, InstanceKlass::cast(base_klass), true);
288 if (vca_result != Reflection::ACCESS_OK) {
289 ResourceMark rm(THREAD);
290 char* msg = Reflection::verify_class_access_msg(ref_klass,
291 InstanceKlass::cast(base_klass),
292 vca_result);
293 bool same_module = (base_klass->module() == ref_klass->module());
294 if (msg == NULL) {
295 Exceptions::fthrow(
296 THREAD_AND_LOCATION,
297 vmSymbols::java_lang_IllegalAccessError(),
298 "failed to access class %s from class %s (%s%s%s)",
299 base_klass->external_name(),
300 ref_klass->external_name(),
301 (same_module) ? base_klass->joint_in_module_of_loader(ref_klass) : base_klass->class_in_module_of_loader(),
302 (same_module) ? "" : "; ",
303 (same_module) ? "" : ref_klass->class_in_module_of_loader());
304 } else {
305 // Use module specific message returned by verify_class_access_msg().
306 Exceptions::fthrow(
307 THREAD_AND_LOCATION,
308 vmSymbols::java_lang_IllegalAccessError(),
309 "%s", msg);
310 }
311 }
312 }
313
314 //------------------------------------------------------------------------------------------------------------------------
315 // Method resolution
316 //
317 // According to JVM spec. $5.4.3c & $5.4.3d
318
319 // Look up method in klasses, including static methods
320 // Then look up local default methods
321 Method* LinkResolver::lookup_method_in_klasses(const LinkInfo& link_info,
322 bool checkpolymorphism,
323 bool in_imethod_resolve) {
324 NoSafepointVerifier nsv; // Method* returned may not be reclaimed
325
326 Klass* klass = link_info.resolved_klass();
327 Symbol* name = link_info.name();
328 Symbol* signature = link_info.signature();
329
330 // Ignore overpasses so statics can be found during resolution
331 Method* result = klass->uncached_lookup_method(name, signature, Klass::skip_overpass);
332
333 if (klass->is_array_klass()) {
334 // Only consider klass and super klass for arrays
335 return result;
336 }
337
338 InstanceKlass* ik = InstanceKlass::cast(klass);
339
340 // JDK 8, JVMS 5.4.3.4: Interface method resolution should
341 // ignore static and non-public methods of java.lang.Object,
342 // like clone, finalize, registerNatives.
343 if (in_imethod_resolve &&
344 result != NULL &&
345 ik->is_interface() &&
346 (result->is_static() || !result->is_public()) &&
347 result->method_holder() == SystemDictionary::Object_klass()) {
348 result = NULL;
349 }
350
351 // Before considering default methods, check for an overpass in the
352 // current class if a method has not been found.
353 if (result == NULL) {
354 result = ik->find_method(name, signature);
355 }
356
357 if (result == NULL) {
358 Array<Method*>* default_methods = ik->default_methods();
359 if (default_methods != NULL) {
360 result = InstanceKlass::find_method(default_methods, name, signature);
361 }
362 }
363
364 if (checkpolymorphism && result != NULL) {
365 vmIntrinsics::ID iid = result->intrinsic_id();
366 if (MethodHandles::is_signature_polymorphic(iid)) {
367 // Do not link directly to these. The VM must produce a synthetic one using lookup_polymorphic_method.
368 return NULL;
369 }
370 }
371 return result;
372 }
373
374 // returns first instance method
375 // Looks up method in classes, then looks up local default methods
376 Method* LinkResolver::lookup_instance_method_in_klasses(Klass* klass,
377 Symbol* name,
378 Symbol* signature,
379 Klass::PrivateLookupMode private_mode, TRAPS) {
380 Method* result = klass->uncached_lookup_method(name, signature, Klass::find_overpass, private_mode);
381
382 while (result != NULL && result->is_static() && result->method_holder()->super() != NULL) {
383 Klass* super_klass = result->method_holder()->super();
384 result = super_klass->uncached_lookup_method(name, signature, Klass::find_overpass, private_mode);
385 }
386
387 if (klass->is_array_klass()) {
388 // Only consider klass and super klass for arrays
389 return result;
390 }
391
392 if (result == NULL) {
393 Array<Method*>* default_methods = InstanceKlass::cast(klass)->default_methods();
394 if (default_methods != NULL) {
395 result = InstanceKlass::find_method(default_methods, name, signature);
396 assert(result == NULL || !result->is_static(), "static defaults not allowed");
397 }
398 }
399 return result;
400 }
401
402 int LinkResolver::vtable_index_of_interface_method(Klass* klass,
403 const methodHandle& resolved_method) {
404
405 int vtable_index = Method::invalid_vtable_index;
406 Symbol* name = resolved_method->name();
407 Symbol* signature = resolved_method->signature();
408 InstanceKlass* ik = InstanceKlass::cast(klass);
409
410 // First check in default method array
411 if (!resolved_method->is_abstract() && ik->default_methods() != NULL) {
412 int index = InstanceKlass::find_method_index(ik->default_methods(),
413 name, signature, Klass::find_overpass,
414 Klass::find_static, Klass::find_private);
415 if (index >= 0 ) {
416 vtable_index = ik->default_vtable_indices()->at(index);
417 }
418 }
419 if (vtable_index == Method::invalid_vtable_index) {
420 // get vtable_index for miranda methods
421 klassVtable vt = ik->vtable();
422 vtable_index = vt.index_of_miranda(name, signature);
423 }
424 return vtable_index;
425 }
426
427 Method* LinkResolver::lookup_method_in_interfaces(const LinkInfo& cp_info) {
428 InstanceKlass *ik = InstanceKlass::cast(cp_info.resolved_klass());
429
430 // Specify 'true' in order to skip default methods when searching the
431 // interfaces. Function lookup_method_in_klasses() already looked for
432 // the method in the default methods table.
433 return ik->lookup_method_in_all_interfaces(cp_info.name(), cp_info.signature(), Klass::skip_defaults);
434 }
435
436 Method* LinkResolver::lookup_polymorphic_method(const LinkInfo& link_info,
437 Handle *appendix_result_or_null,
438 TRAPS) {
439 ResourceMark rm(THREAD);
440 Klass* klass = link_info.resolved_klass();
441 Symbol* name = link_info.name();
442 Symbol* full_signature = link_info.signature();
443 LogTarget(Info, methodhandles) lt_mh;
444
445 vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name);
446 log_info(methodhandles)("lookup_polymorphic_method iid=%s %s.%s%s",
447 vmIntrinsics::name_at(iid), klass->external_name(),
448 name->as_C_string(), full_signature->as_C_string());
449 if ((klass == SystemDictionary::MethodHandle_klass() ||
450 klass == SystemDictionary::VarHandle_klass()) &&
451 iid != vmIntrinsics::_none) {
452 if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) {
453 // Most of these do not need an up-call to Java to resolve, so can be done anywhere.
454 // Do not erase last argument type (MemberName) if it is a static linkTo method.
455 bool keep_last_arg = MethodHandles::is_signature_polymorphic_static(iid);
456 TempNewSymbol basic_signature =
457 MethodHandles::lookup_basic_type_signature(full_signature, keep_last_arg, CHECK_NULL);
458 log_info(methodhandles)("lookup_polymorphic_method %s %s => basic %s",
459 name->as_C_string(),
460 full_signature->as_C_string(),
461 basic_signature->as_C_string());
462 Method* result = SystemDictionary::find_method_handle_intrinsic(iid,
463 basic_signature,
464 CHECK_NULL);
465 if (result != NULL) {
466 assert(result->is_method_handle_intrinsic(), "MH.invokeBasic or MH.linkTo* intrinsic");
467 assert(result->intrinsic_id() != vmIntrinsics::_invokeGeneric, "wrong place to find this");
468 assert(basic_signature == result->signature(), "predict the result signature");
469 if (lt_mh.is_enabled()) {
470 LogStream ls(lt_mh);
471 ls.print("lookup_polymorphic_method => intrinsic ");
472 result->print_on(&ls);
473 }
474 }
475 return result;
476 } else if (iid == vmIntrinsics::_invokeGeneric
477 && THREAD->can_call_java()
478 && appendix_result_or_null != NULL) {
479 // This is a method with type-checking semantics.
480 // We will ask Java code to spin an adapter method for it.
481 if (!MethodHandles::enabled()) {
482 // Make sure the Java part of the runtime has been booted up.
483 Klass* natives = SystemDictionary::MethodHandleNatives_klass();
484 if (natives == NULL || InstanceKlass::cast(natives)->is_not_initialized()) {
485 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_invoke_MethodHandleNatives(),
486 Handle(),
487 Handle(),
488 true,
489 CHECK_NULL);
490 }
491 }
492
493 Handle appendix;
494 Handle method_type;
495 Method* result = SystemDictionary::find_method_handle_invoker(
496 klass,
497 name,
498 full_signature,
499 link_info.current_klass(),
500 &appendix,
501 CHECK_NULL);
502 if (lt_mh.is_enabled()) {
503 LogStream ls(lt_mh);
504 ls.print("lookup_polymorphic_method => (via Java) ");
505 result->print_on(&ls);
506 ls.print(" lookup_polymorphic_method => appendix = ");
507 appendix.is_null() ? ls.print_cr("(none)") : appendix->print_on(&ls);
508 }
509 if (result != NULL) {
510 #ifdef ASSERT
511 ResourceMark rm(THREAD);
512
513 TempNewSymbol basic_signature =
514 MethodHandles::lookup_basic_type_signature(full_signature, CHECK_NULL);
515 int actual_size_of_params = result->size_of_parameters();
516 int expected_size_of_params = ArgumentSizeComputer(basic_signature).size();
517 // +1 for MethodHandle.this, +1 for trailing MethodType
518 if (!MethodHandles::is_signature_polymorphic_static(iid)) expected_size_of_params += 1;
519 if (appendix.not_null()) expected_size_of_params += 1;
520 if (actual_size_of_params != expected_size_of_params) {
521 tty->print_cr("*** basic_signature=%s", basic_signature->as_C_string());
522 tty->print_cr("*** result for %s: ", vmIntrinsics::name_at(iid));
523 result->print();
524 }
525 assert(actual_size_of_params == expected_size_of_params,
526 "%d != %d", actual_size_of_params, expected_size_of_params);
527 #endif //ASSERT
528
529 assert(appendix_result_or_null != NULL, "");
530 (*appendix_result_or_null) = appendix;
531 }
532 return result;
533 }
534 }
535 return NULL;
536 }
537
538 static void print_nest_host_error_on(stringStream* ss, Klass* ref_klass, Klass* sel_klass, TRAPS) {
539 assert(ref_klass->is_instance_klass(), "must be");
540 assert(sel_klass->is_instance_klass(), "must be");
541 InstanceKlass* ref_ik = InstanceKlass::cast(ref_klass);
542 InstanceKlass* sel_ik = InstanceKlass::cast(sel_klass);
543 const char* nest_host_error_1 = ref_ik->nest_host_error(THREAD);
544 const char* nest_host_error_2 = sel_ik->nest_host_error(THREAD);
545 if (nest_host_error_1 != NULL || nest_host_error_2 != NULL) {
546 ss->print(", (%s%s%s)",
547 (nest_host_error_1 != NULL) ? nest_host_error_1 : "",
548 (nest_host_error_1 != NULL && nest_host_error_2 != NULL) ? ", " : "",
549 (nest_host_error_2 != NULL) ? nest_host_error_2 : "");
550 }
551 }
552
553 void LinkResolver::check_method_accessability(Klass* ref_klass,
554 Klass* resolved_klass,
555 Klass* sel_klass,
556 const methodHandle& sel_method,
557 TRAPS) {
558
559 AccessFlags flags = sel_method->access_flags();
560
561 // Special case: arrays always override "clone". JVMS 2.15.
562 // If the resolved klass is an array class, and the declaring class
563 // is java.lang.Object and the method is "clone", set the flags
564 // to public.
565 //
566 // We'll check for the method name first, as that's most likely
567 // to be false (so we'll short-circuit out of these tests).
568 if (sel_method->name() == vmSymbols::clone_name() &&
569 sel_klass == SystemDictionary::Object_klass() &&
570 resolved_klass->is_array_klass()) {
571 // We need to change "protected" to "public".
572 assert(flags.is_protected(), "clone not protected?");
573 jint new_flags = flags.as_int();
574 new_flags = new_flags & (~JVM_ACC_PROTECTED);
575 new_flags = new_flags | JVM_ACC_PUBLIC;
576 flags.set_flags(new_flags);
577 }
578 // assert(extra_arg_result_or_null != NULL, "must be able to return extra argument");
579
580 bool can_access = Reflection::verify_member_access(ref_klass,
581 resolved_klass,
582 sel_klass,
583 flags,
584 true, false, CHECK);
585 // Any existing exceptions that may have been thrown
586 // have been allowed to propagate.
587 if (!can_access) {
588 ResourceMark rm(THREAD);
589 stringStream ss;
590 bool same_module = (sel_klass->module() == ref_klass->module());
591 ss.print("class %s tried to access %s%s%smethod '%s' (%s%s%s)",
592 ref_klass->external_name(),
593 sel_method->is_abstract() ? "abstract " : "",
594 sel_method->is_protected() ? "protected " : "",
595 sel_method->is_private() ? "private " : "",
596 sel_method->external_name(),
597 (same_module) ? ref_klass->joint_in_module_of_loader(sel_klass) : ref_klass->class_in_module_of_loader(),
598 (same_module) ? "" : "; ",
599 (same_module) ? "" : sel_klass->class_in_module_of_loader()
600 );
601
602 // For private access see if there was a problem with nest host
603 // resolution, and if so report that as part of the message.
604 if (sel_method->is_private()) {
605 print_nest_host_error_on(&ss, ref_klass, sel_klass, THREAD);
606 }
607
608 Exceptions::fthrow(THREAD_AND_LOCATION,
609 vmSymbols::java_lang_IllegalAccessError(),
610 "%s",
611 ss.as_string()
612 );
613 return;
614 }
615 }
616
617 Method* LinkResolver::resolve_method_statically(Bytecodes::Code code,
618 const constantPoolHandle& pool, int index, TRAPS) {
619 // This method is used only
620 // (1) in C2 from InlineTree::ok_to_inline (via ciMethod::check_call),
621 // and
622 // (2) in Bytecode_invoke::static_target
623 // It appears to fail when applied to an invokeinterface call site.
624 // FIXME: Remove this method and ciMethod::check_call; refactor to use the other LinkResolver entry points.
625 // resolve klass
626 if (code == Bytecodes::_invokedynamic) {
627 Klass* resolved_klass = SystemDictionary::MethodHandle_klass();
628 Symbol* method_name = vmSymbols::invoke_name();
629 Symbol* method_signature = pool->signature_ref_at(index);
630 Klass* current_klass = pool->pool_holder();
631 LinkInfo link_info(resolved_klass, method_name, method_signature, current_klass);
632 return resolve_method(link_info, code, THREAD);
633 }
634
635 LinkInfo link_info(pool, index, methodHandle(), CHECK_NULL);
636 Klass* resolved_klass = link_info.resolved_klass();
637
638 if (pool->has_preresolution()
639 || (resolved_klass == SystemDictionary::MethodHandle_klass() &&
640 MethodHandles::is_signature_polymorphic_name(resolved_klass, link_info.name()))) {
641 Method* result = ConstantPool::method_at_if_loaded(pool, index);
642 if (result != NULL) {
643 return result;
644 }
645 }
646
647 if (code == Bytecodes::_invokeinterface) {
648 return resolve_interface_method(link_info, code, THREAD);
649 } else if (code == Bytecodes::_invokevirtual) {
650 return resolve_method(link_info, code, THREAD);
651 } else if (!resolved_klass->is_interface()) {
652 return resolve_method(link_info, code, THREAD);
653 } else {
654 return resolve_interface_method(link_info, code, THREAD);
655 }
656 }
657
658 // Check and print a loader constraint violation message for method or interface method
659 void LinkResolver::check_method_loader_constraints(const LinkInfo& link_info,
660 const methodHandle& resolved_method,
661 const char* method_type, TRAPS) {
662 Handle current_loader(THREAD, link_info.current_klass()->class_loader());
663 Handle resolved_loader(THREAD, resolved_method->method_holder()->class_loader());
664
665 ResourceMark rm(THREAD);
666 Symbol* failed_type_symbol =
667 SystemDictionary::check_signature_loaders(link_info.signature(), current_loader,
668 resolved_loader, true, CHECK);
669 if (failed_type_symbol != NULL) {
670 Klass* current_class = link_info.current_klass();
671 ClassLoaderData* current_loader_data = current_class->class_loader_data();
672 assert(current_loader_data != NULL, "current class has no class loader data");
673 Klass* resolved_method_class = resolved_method->method_holder();
674 ClassLoaderData* target_loader_data = resolved_method_class->class_loader_data();
675 assert(target_loader_data != NULL, "resolved method's class has no class loader data");
676
677 stringStream ss;
678 ss.print("loader constraint violation: when resolving %s '", method_type);
679 Method::print_external_name(&ss, link_info.resolved_klass(), link_info.name(), link_info.signature());
680 ss.print("' the class loader %s of the current class, %s,"
681 " and the class loader %s for the method's defining class, %s, have"
682 " different Class objects for the type %s used in the signature (%s; %s)",
683 current_loader_data->loader_name_and_id(),
684 current_class->name()->as_C_string(),
685 target_loader_data->loader_name_and_id(),
686 resolved_method_class->name()->as_C_string(),
687 failed_type_symbol->as_C_string(),
688 current_class->class_in_module_of_loader(false, true),
689 resolved_method_class->class_in_module_of_loader(false, true));
690 THROW_MSG(vmSymbols::java_lang_LinkageError(), ss.as_string());
691 }
692 }
693
694 void LinkResolver::check_field_loader_constraints(Symbol* field, Symbol* sig,
695 Klass* current_klass,
696 Klass* sel_klass, TRAPS) {
697 Handle ref_loader(THREAD, current_klass->class_loader());
698 Handle sel_loader(THREAD, sel_klass->class_loader());
699
700 ResourceMark rm(THREAD); // needed for check_signature_loaders
701 Symbol* failed_type_symbol =
702 SystemDictionary::check_signature_loaders(sig,
703 ref_loader, sel_loader,
704 false,
705 CHECK);
706 if (failed_type_symbol != NULL) {
707 stringStream ss;
708 const char* failed_type_name = failed_type_symbol->as_klass_external_name();
709
710 ss.print("loader constraint violation: when resolving field \"%s\" of type %s, "
711 "the class loader %s of the current class, %s, "
712 "and the class loader %s for the field's defining %s, %s, "
713 "have different Class objects for type %s (%s; %s)",
714 field->as_C_string(),
715 failed_type_name,
716 current_klass->class_loader_data()->loader_name_and_id(),
717 current_klass->external_name(),
718 sel_klass->class_loader_data()->loader_name_and_id(),
719 sel_klass->external_kind(),
720 sel_klass->external_name(),
721 failed_type_name,
722 current_klass->class_in_module_of_loader(false, true),
723 sel_klass->class_in_module_of_loader(false, true));
724 THROW_MSG(vmSymbols::java_lang_LinkageError(), ss.as_string());
725 }
726 }
727
728 Method* LinkResolver::resolve_method(const LinkInfo& link_info,
729 Bytecodes::Code code, TRAPS) {
730
731 Handle nested_exception;
732 Klass* resolved_klass = link_info.resolved_klass();
733
734 // 1. For invokevirtual, cannot call an interface method
735 if (code == Bytecodes::_invokevirtual && resolved_klass->is_interface()) {
736 ResourceMark rm(THREAD);
737 char buf[200];
738 jio_snprintf(buf, sizeof(buf), "Found interface %s, but class was expected",
739 resolved_klass->external_name());
740 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
741 }
742
743 // 2. check constant pool tag for called method - must be JVM_CONSTANT_Methodref
744 if (!link_info.tag().is_invalid() && !link_info.tag().is_method()) {
745 ResourceMark rm(THREAD);
746 stringStream ss;
747 ss.print("Method '");
748 Method::print_external_name(&ss, link_info.resolved_klass(), link_info.name(), link_info.signature());
749 ss.print("' must be Methodref constant");
750 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
751 }
752
753 // 3. lookup method in resolved klass and its super klasses
754 methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, true, false));
755
756 // 4. lookup method in all the interfaces implemented by the resolved klass
757 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) { // not found in the class hierarchy
758 resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info));
759
760 if (resolved_method.is_null()) {
761 // JSR 292: see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc
762 Method* method = lookup_polymorphic_method(link_info, (Handle*)NULL, THREAD);
763 resolved_method = methodHandle(THREAD, method);
764 if (HAS_PENDING_EXCEPTION) {
765 nested_exception = Handle(THREAD, PENDING_EXCEPTION);
766 CLEAR_PENDING_EXCEPTION;
767 }
768 }
769 }
770
771 // 5. method lookup failed
772 if (resolved_method.is_null()) {
773 ResourceMark rm(THREAD);
774 stringStream ss;
775 ss.print("'");
776 Method::print_external_name(&ss, resolved_klass, link_info.name(), link_info.signature());
777 ss.print("'");
778 THROW_MSG_CAUSE_(vmSymbols::java_lang_NoSuchMethodError(),
779 ss.as_string(), nested_exception, NULL);
780 }
781
782 // 6. access checks, access checking may be turned off when calling from within the VM.
783 Klass* current_klass = link_info.current_klass();
784 if (link_info.check_access()) {
785 assert(current_klass != NULL , "current_klass should not be null");
786
787 // check if method can be accessed by the referring class
788 check_method_accessability(current_klass,
789 resolved_klass,
790 resolved_method->method_holder(),
791 resolved_method,
792 CHECK_NULL);
793
794 // check loader constraints
795 check_method_loader_constraints(link_info, resolved_method, "method", CHECK_NULL);
796 }
797
798 return resolved_method();
799 }
800
801 static void trace_method_resolution(const char* prefix,
802 Klass* klass,
803 Klass* resolved_klass,
804 Method* method,
805 bool logitables,
806 int index = -1) {
807 #ifndef PRODUCT
808 ResourceMark rm;
809 Log(itables) logi;
810 LogStream lsi(logi.trace());
811 Log(vtables) logv;
812 LogStream lsv(logv.trace());
813 outputStream* st;
814 if (logitables) {
815 st = &lsi;
816 } else {
817 st = &lsv;
818 }
819 st->print("%s%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ",
820 prefix,
821 (klass == NULL ? "<NULL>" : klass->internal_name()),
822 (resolved_klass == NULL ? "<NULL>" : resolved_klass->internal_name()),
823 Method::name_and_sig_as_C_string(resolved_klass,
824 method->name(),
825 method->signature()),
826 method->method_holder()->internal_name());
827 method->print_linkage_flags(st);
828 if (index != -1) {
829 st->print("vtable_index:%d", index);
830 }
831 st->cr();
832 #endif // PRODUCT
833 }
834
835 // Do linktime resolution of a method in the interface within the context of the specied bytecode.
836 Method* LinkResolver::resolve_interface_method(const LinkInfo& link_info, Bytecodes::Code code, TRAPS) {
837
838 Klass* resolved_klass = link_info.resolved_klass();
839
840 // check if klass is interface
841 if (!resolved_klass->is_interface()) {
842 ResourceMark rm(THREAD);
843 char buf[200];
844 jio_snprintf(buf, sizeof(buf), "Found class %s, but interface was expected", resolved_klass->external_name());
845 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
846 }
847
848 // check constant pool tag for called method - must be JVM_CONSTANT_InterfaceMethodref
849 if (!link_info.tag().is_invalid() && !link_info.tag().is_interface_method()) {
850 ResourceMark rm(THREAD);
851 stringStream ss;
852 ss.print("Method '");
853 Method::print_external_name(&ss, link_info.resolved_klass(), link_info.name(), link_info.signature());
854 ss.print("' must be InterfaceMethodref constant");
855 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
856 }
857
858 // lookup method in this interface or its super, java.lang.Object
859 // JDK8: also look for static methods
860 methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, false, true));
861
862 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) {
863 // lookup method in all the super-interfaces
864 resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info));
865 }
866
867 if (resolved_method.is_null()) {
868 // no method found
869 ResourceMark rm(THREAD);
870 stringStream ss;
871 ss.print("'");
872 Method::print_external_name(&ss, resolved_klass, link_info.name(), link_info.signature());
873 ss.print("'");
874 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), ss.as_string());
875 }
876
877 if (link_info.check_access()) {
878 // JDK8 adds non-public interface methods, and accessability check requirement
879 Klass* current_klass = link_info.current_klass();
880
881 assert(current_klass != NULL , "current_klass should not be null");
882
883 // check if method can be accessed by the referring class
884 check_method_accessability(current_klass,
885 resolved_klass,
886 resolved_method->method_holder(),
887 resolved_method,
888 CHECK_NULL);
889
890 check_method_loader_constraints(link_info, resolved_method, "interface method", CHECK_NULL);
891 }
892
893 if (code != Bytecodes::_invokestatic && resolved_method->is_static()) {
894 ResourceMark rm(THREAD);
895 stringStream ss;
896 ss.print("Expected instance not static method '");
897 Method::print_external_name(&ss, resolved_klass,
898 resolved_method->name(), resolved_method->signature());
899 ss.print("'");
900 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
901 }
902
903 if (log_develop_is_enabled(Trace, itables)) {
904 char buf[200];
905 jio_snprintf(buf, sizeof(buf), "%s resolved interface method: caller-class:",
906 Bytecodes::name(code));
907 trace_method_resolution(buf, link_info.current_klass(), resolved_klass, resolved_method(), true);
908 }
909
910 return resolved_method();
911 }
912
913 //------------------------------------------------------------------------------------------------------------------------
914 // Field resolution
915
916 void LinkResolver::check_field_accessability(Klass* ref_klass,
917 Klass* resolved_klass,
918 Klass* sel_klass,
919 const fieldDescriptor& fd,
920 TRAPS) {
921 bool can_access = Reflection::verify_member_access(ref_klass,
922 resolved_klass,
923 sel_klass,
924 fd.access_flags(),
925 true, false, CHECK);
926 // Any existing exceptions that may have been thrown, for example LinkageErrors
927 // from nest-host resolution, have been allowed to propagate.
928 if (!can_access) {
929 bool same_module = (sel_klass->module() == ref_klass->module());
930 ResourceMark rm(THREAD);
931 stringStream ss;
932 ss.print("class %s tried to access %s%sfield %s.%s (%s%s%s)",
933 ref_klass->external_name(),
934 fd.is_protected() ? "protected " : "",
935 fd.is_private() ? "private " : "",
936 sel_klass->external_name(),
937 fd.name()->as_C_string(),
938 (same_module) ? ref_klass->joint_in_module_of_loader(sel_klass) : ref_klass->class_in_module_of_loader(),
939 (same_module) ? "" : "; ",
940 (same_module) ? "" : sel_klass->class_in_module_of_loader()
941 );
942 // For private access see if there was a problem with nest host
943 // resolution, and if so report that as part of the message.
944 if (fd.is_private()) {
945 print_nest_host_error_on(&ss, ref_klass, sel_klass, THREAD);
946 }
947 Exceptions::fthrow(THREAD_AND_LOCATION,
948 vmSymbols::java_lang_IllegalAccessError(),
949 "%s",
950 ss.as_string()
951 );
952 return;
953 }
954 }
955
956 void LinkResolver::resolve_field_access(fieldDescriptor& fd, const constantPoolHandle& pool, int index, const methodHandle& method, Bytecodes::Code byte, TRAPS) {
957 LinkInfo link_info(pool, index, method, CHECK);
958 resolve_field(fd, link_info, byte, true, CHECK);
959 }
960
961 void LinkResolver::resolve_field(fieldDescriptor& fd,
962 const LinkInfo& link_info,
963 Bytecodes::Code byte, bool initialize_class,
964 TRAPS) {
965 assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic ||
966 byte == Bytecodes::_getfield || byte == Bytecodes::_putfield ||
967 byte == Bytecodes::_nofast_getfield || byte == Bytecodes::_nofast_putfield ||
968 (byte == Bytecodes::_nop && !link_info.check_access()), "bad field access bytecode");
969
970 bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic);
971 bool is_put = (byte == Bytecodes::_putfield || byte == Bytecodes::_putstatic || byte == Bytecodes::_nofast_putfield);
972 // Check if there's a resolved klass containing the field
973 Klass* resolved_klass = link_info.resolved_klass();
974 Symbol* field = link_info.name();
975 Symbol* sig = link_info.signature();
976
977 if (resolved_klass == NULL) {
978 ResourceMark rm(THREAD);
979 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
980 }
981
982 // Resolve instance field
983 Klass* sel_klass = resolved_klass->find_field(field, sig, &fd);
984 // check if field exists; i.e., if a klass containing the field def has been selected
985 if (sel_klass == NULL) {
986 ResourceMark rm(THREAD);
987 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
988 }
989
990 // Access checking may be turned off when calling from within the VM.
991 Klass* current_klass = link_info.current_klass();
992 if (link_info.check_access()) {
993
994 // check access
995 check_field_accessability(current_klass, resolved_klass, sel_klass, fd, CHECK);
996
997 // check for errors
998 if (is_static != fd.is_static()) {
999 ResourceMark rm(THREAD);
1000 char msg[200];
1001 jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string());
1002 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg);
1003 }
1004
1005 // A final field can be modified only
1006 // (1) by methods declared in the class declaring the field and
1007 // (2) by the <clinit> method (in case of a static field)
1008 // or by the <init> method (in case of an instance field).
1009 if (is_put && fd.access_flags().is_final()) {
1010
1011 if (sel_klass != current_klass) {
1012 ResourceMark rm(THREAD);
1013 stringStream ss;
1014 ss.print("Update to %s final field %s.%s attempted from a different class (%s) than the field's declaring class",
1015 is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(),
1016 current_klass->external_name());
1017 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
1018 }
1019
1020 if (fd.constants()->pool_holder()->major_version() >= 53) {
1021 Method* m = link_info.current_method();
1022 assert(m != NULL, "information about the current method must be available for 'put' bytecodes");
1023 bool is_initialized_static_final_update = (byte == Bytecodes::_putstatic &&
1024 fd.is_static() &&
1025 !m->is_static_initializer());
1026 bool is_initialized_instance_final_update = ((byte == Bytecodes::_putfield || byte == Bytecodes::_nofast_putfield) &&
1027 !fd.is_static() &&
1028 !m->is_object_initializer());
1029
1030 if (is_initialized_static_final_update || is_initialized_instance_final_update) {
1031 ResourceMark rm(THREAD);
1032 stringStream ss;
1033 ss.print("Update to %s final field %s.%s attempted from a different method (%s) than the initializer method %s ",
1034 is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(),
1035 m->name()->as_C_string(),
1036 is_static ? "<clinit>" : "<init>");
1037 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
1038 }
1039 }
1040 }
1041
1042 // initialize resolved_klass if necessary
1043 // note 1: the klass which declared the field must be initialized (i.e, sel_klass)
1044 // according to the newest JVM spec (5.5, p.170) - was bug (gri 7/28/99)
1045 //
1046 // note 2: we don't want to force initialization if we are just checking
1047 // if the field access is legal; e.g., during compilation
1048 if (is_static && initialize_class) {
1049 sel_klass->initialize(CHECK);
1050 }
1051 }
1052
1053 if ((sel_klass != current_klass) && (current_klass != NULL)) {
1054 check_field_loader_constraints(field, sig, current_klass, sel_klass, CHECK);
1055 }
1056
1057 // return information. note that the klass is set to the actual klass containing the
1058 // field, otherwise access of static fields in superclasses will not work.
1059 }
1060
1061
1062 //------------------------------------------------------------------------------------------------------------------------
1063 // Invoke resolution
1064 //
1065 // Naming conventions:
1066 //
1067 // resolved_method the specified method (i.e., static receiver specified via constant pool index)
1068 // sel_method the selected method (selected via run-time lookup; e.g., based on dynamic receiver class)
1069 // resolved_klass the specified klass (i.e., specified via constant pool index)
1070 // recv_klass the receiver klass
1071
1072
1073 void LinkResolver::resolve_static_call(CallInfo& result,
1074 const LinkInfo& link_info,
1075 bool initialize_class, TRAPS) {
1076 Method* resolved_method = linktime_resolve_static_method(link_info, CHECK);
1077
1078 // The resolved class can change as a result of this resolution.
1079 Klass* resolved_klass = resolved_method->method_holder();
1080
1081 // Initialize klass (this should only happen if everything is ok)
1082 if (initialize_class && resolved_klass->should_be_initialized()) {
1083 resolved_klass->initialize(CHECK);
1084 // Use updated LinkInfo to reresolve with resolved method holder
1085 LinkInfo new_info(resolved_klass, link_info.name(), link_info.signature(),
1086 link_info.current_klass(),
1087 link_info.check_access() ? LinkInfo::needs_access_check : LinkInfo::skip_access_check);
1088 resolved_method = linktime_resolve_static_method(new_info, CHECK);
1089 }
1090
1091 // setup result
1092 result.set_static(resolved_klass, methodHandle(THREAD, resolved_method), CHECK);
1093 }
1094
1095 // throws linktime exceptions
1096 Method* LinkResolver::linktime_resolve_static_method(const LinkInfo& link_info, TRAPS) {
1097
1098 Klass* resolved_klass = link_info.resolved_klass();
1099 Method* resolved_method;
1100 if (!resolved_klass->is_interface()) {
1101 resolved_method = resolve_method(link_info, Bytecodes::_invokestatic, CHECK_NULL);
1102 } else {
1103 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokestatic, CHECK_NULL);
1104 }
1105 assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier");
1106
1107 // check if static
1108 if (!resolved_method->is_static()) {
1109 ResourceMark rm(THREAD);
1110 stringStream ss;
1111 ss.print("Expected static method '");
1112 resolved_method->print_external_name(&ss);
1113 ss.print("'");
1114 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1115 }
1116 return resolved_method;
1117 }
1118
1119
1120 void LinkResolver::resolve_special_call(CallInfo& result,
1121 Handle recv,
1122 const LinkInfo& link_info,
1123 TRAPS) {
1124 Method* resolved_method = linktime_resolve_special_method(link_info, CHECK);
1125 runtime_resolve_special_method(result, link_info, methodHandle(THREAD, resolved_method), recv, CHECK);
1126 }
1127
1128 // throws linktime exceptions
1129 Method* LinkResolver::linktime_resolve_special_method(const LinkInfo& link_info, TRAPS) {
1130
1131 // Invokespecial is called for multiple special reasons:
1132 // <init>
1133 // local private method invocation, for classes and interfaces
1134 // superclass.method, which can also resolve to a default method
1135 // and the selected method is recalculated relative to the direct superclass
1136 // superinterface.method, which explicitly does not check shadowing
1137 Klass* resolved_klass = link_info.resolved_klass();
1138 Method* resolved_method;
1139
1140 if (!resolved_klass->is_interface()) {
1141 resolved_method = resolve_method(link_info, Bytecodes::_invokespecial, CHECK_NULL);
1142 } else {
1143 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokespecial, CHECK_NULL);
1144 }
1145
1146 // check if method name is <init>, that it is found in same klass as static type
1147 if (resolved_method->name() == vmSymbols::object_initializer_name() &&
1148 resolved_method->method_holder() != resolved_klass) {
1149 ResourceMark rm(THREAD);
1150 stringStream ss;
1151 ss.print("%s: method '", resolved_klass->external_name());
1152 resolved_method->signature()->print_as_signature_external_return_type(&ss);
1153 ss.print(" %s(", resolved_method->name()->as_C_string());
1154 resolved_method->signature()->print_as_signature_external_parameters(&ss);
1155 ss.print(")' not found");
1156 Exceptions::fthrow(
1157 THREAD_AND_LOCATION,
1158 vmSymbols::java_lang_NoSuchMethodError(),
1159 "%s", ss.as_string());
1160 return NULL;
1161 }
1162
1163 // ensure that invokespecial's interface method reference is in
1164 // a direct superinterface, not an indirect superinterface
1165 Klass* current_klass = link_info.current_klass();
1166 if (current_klass != NULL && resolved_klass->is_interface()) {
1167 InstanceKlass* ck = InstanceKlass::cast(current_klass);
1168 InstanceKlass *klass_to_check = !ck->is_unsafe_anonymous() ?
1169 ck :
1170 ck->unsafe_anonymous_host();
1171 // Disable verification for the dynamically-generated reflection bytecodes.
1172 bool is_reflect = klass_to_check->is_subclass_of(
1173 SystemDictionary::reflect_MagicAccessorImpl_klass());
1174
1175 if (!is_reflect &&
1176 !klass_to_check->is_same_or_direct_interface(resolved_klass)) {
1177 ResourceMark rm(THREAD);
1178 stringStream ss;
1179 ss.print("Interface method reference: '");
1180 resolved_method->print_external_name(&ss);
1181 ss.print("', is in an indirect superinterface of %s",
1182 current_klass->external_name());
1183 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1184 }
1185 }
1186
1187 // check if not static
1188 if (resolved_method->is_static()) {
1189 ResourceMark rm(THREAD);
1190 stringStream ss;
1191 ss.print("Expecting non-static method '");
1192 resolved_method->print_external_name(&ss);
1193 ss.print("'");
1194 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1195 }
1196
1197 if (log_develop_is_enabled(Trace, itables)) {
1198 trace_method_resolution("invokespecial resolved method: caller-class:",
1199 current_klass, resolved_klass, resolved_method, true);
1200 }
1201
1202 return resolved_method;
1203 }
1204
1205 // throws runtime exceptions
1206 void LinkResolver::runtime_resolve_special_method(CallInfo& result,
1207 const LinkInfo& link_info,
1208 const methodHandle& resolved_method,
1209 Handle recv, TRAPS) {
1210
1211 Klass* resolved_klass = link_info.resolved_klass();
1212
1213 // resolved method is selected method unless we have an old-style lookup
1214 // for a superclass method
1215 // Invokespecial for a superinterface, resolved method is selected method,
1216 // no checks for shadowing
1217 methodHandle sel_method(THREAD, resolved_method());
1218
1219 if (link_info.check_access() &&
1220 // check if the method is not <init>
1221 resolved_method->name() != vmSymbols::object_initializer_name()) {
1222
1223 Klass* current_klass = link_info.current_klass();
1224
1225 // Check if the class of the resolved_klass is a superclass
1226 // (not supertype in order to exclude interface classes) of the current class.
1227 // This check is not performed for super.invoke for interface methods
1228 // in super interfaces.
1229 if (current_klass->is_subclass_of(resolved_klass) &&
1230 current_klass != resolved_klass) {
1231 // Lookup super method
1232 Klass* super_klass = current_klass->super();
1233 Method* instance_method = lookup_instance_method_in_klasses(super_klass,
1234 resolved_method->name(),
1235 resolved_method->signature(),
1236 Klass::find_private, CHECK);
1237 sel_method = methodHandle(THREAD, instance_method);
1238
1239 // check if found
1240 if (sel_method.is_null()) {
1241 ResourceMark rm(THREAD);
1242 stringStream ss;
1243 ss.print("'");
1244 resolved_method->print_external_name(&ss);
1245 ss.print("'");
1246 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1247 // check loader constraints if found a different method
1248 } else if (sel_method() != resolved_method()) {
1249 check_method_loader_constraints(link_info, sel_method, "method", CHECK);
1250 }
1251 }
1252
1253 // Check that the class of objectref (the receiver) is the current class or interface,
1254 // or a subtype of the current class or interface (the sender), otherwise invokespecial
1255 // throws IllegalAccessError.
1256 // The verifier checks that the sender is a subtype of the class in the I/MR operand.
1257 // The verifier also checks that the receiver is a subtype of the sender, if the sender is
1258 // a class. If the sender is an interface, the check has to be performed at runtime.
1259 InstanceKlass* sender = InstanceKlass::cast(current_klass);
1260 sender = sender->is_unsafe_anonymous() ? sender->unsafe_anonymous_host() : sender;
1261 if (sender->is_interface() && recv.not_null()) {
1262 Klass* receiver_klass = recv->klass();
1263 if (!receiver_klass->is_subtype_of(sender)) {
1264 ResourceMark rm(THREAD);
1265 char buf[500];
1266 jio_snprintf(buf, sizeof(buf),
1267 "Receiver class %s must be the current class or a subtype of interface %s",
1268 receiver_klass->external_name(),
1269 sender->external_name());
1270 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), buf);
1271 }
1272 }
1273 }
1274
1275 // check if not static
1276 if (sel_method->is_static()) {
1277 ResourceMark rm(THREAD);
1278 stringStream ss;
1279 ss.print("Expecting non-static method '");
1280 resolved_method->print_external_name(&ss);
1281 ss.print("'");
1282 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1283 }
1284
1285 // check if abstract
1286 if (sel_method->is_abstract()) {
1287 ResourceMark rm(THREAD);
1288 stringStream ss;
1289 ss.print("'");
1290 Method::print_external_name(&ss, resolved_klass, sel_method->name(), sel_method->signature());
1291 ss.print("'");
1292 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1293 }
1294
1295 if (log_develop_is_enabled(Trace, itables)) {
1296 trace_method_resolution("invokespecial selected method: resolved-class:",
1297 resolved_klass, resolved_klass, sel_method(), true);
1298 }
1299
1300 // setup result
1301 result.set_static(resolved_klass, sel_method, CHECK);
1302 }
1303
1304 void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, Klass* receiver_klass,
1305 const LinkInfo& link_info,
1306 bool check_null_and_abstract, TRAPS) {
1307 Method* resolved_method = linktime_resolve_virtual_method(link_info, CHECK);
1308 runtime_resolve_virtual_method(result, methodHandle(THREAD, resolved_method),
1309 link_info.resolved_klass(),
1310 recv, receiver_klass,
1311 check_null_and_abstract, CHECK);
1312 }
1313
1314 // throws linktime exceptions
1315 Method* LinkResolver::linktime_resolve_virtual_method(const LinkInfo& link_info,
1316 TRAPS) {
1317 // normal method resolution
1318 Method* resolved_method = resolve_method(link_info, Bytecodes::_invokevirtual, CHECK_NULL);
1319
1320 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1321 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1322
1323 // check if private interface method
1324 Klass* resolved_klass = link_info.resolved_klass();
1325 Klass* current_klass = link_info.current_klass();
1326
1327 // This is impossible, if resolve_klass is an interface, we've thrown icce in resolve_method
1328 if (resolved_klass->is_interface() && resolved_method->is_private()) {
1329 ResourceMark rm(THREAD);
1330 stringStream ss;
1331 ss.print("private interface method requires invokespecial, not invokevirtual: method '");
1332 resolved_method->print_external_name(&ss);
1333 ss.print("', caller-class: %s",
1334 (current_klass == NULL ? "<null>" : current_klass->internal_name()));
1335 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1336 }
1337
1338 // check if not static
1339 if (resolved_method->is_static()) {
1340 ResourceMark rm(THREAD);
1341 stringStream ss;
1342 ss.print("Expecting non-static method '");
1343 resolved_method->print_external_name(&ss);
1344 ss.print("'");
1345 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1346 }
1347
1348 if (log_develop_is_enabled(Trace, vtables)) {
1349 trace_method_resolution("invokevirtual resolved method: caller-class:",
1350 current_klass, resolved_klass, resolved_method, false);
1351 }
1352
1353 return resolved_method;
1354 }
1355
1356 // throws runtime exceptions
1357 void LinkResolver::runtime_resolve_virtual_method(CallInfo& result,
1358 const methodHandle& resolved_method,
1359 Klass* resolved_klass,
1360 Handle recv,
1361 Klass* recv_klass,
1362 bool check_null_and_abstract,
1363 TRAPS) {
1364
1365 // setup default return values
1366 int vtable_index = Method::invalid_vtable_index;
1367 methodHandle selected_method;
1368
1369 // runtime method resolution
1370 if (check_null_and_abstract && recv.is_null()) { // check if receiver exists
1371 THROW(vmSymbols::java_lang_NullPointerException());
1372 }
1373
1374 // Virtual methods cannot be resolved before its klass has been linked, for otherwise the Method*'s
1375 // has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since
1376 // a missing receiver might result in a bogus lookup.
1377 assert(resolved_method->method_holder()->is_linked(), "must be linked");
1378
1379 // do lookup based on receiver klass using the vtable index
1380 if (resolved_method->method_holder()->is_interface()) { // default or miranda method
1381 vtable_index = vtable_index_of_interface_method(resolved_klass, resolved_method);
1382 assert(vtable_index >= 0 , "we should have valid vtable index at this point");
1383
1384 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1385 } else {
1386 // at this point we are sure that resolved_method is virtual and not
1387 // a default or miranda method; therefore, it must have a valid vtable index.
1388 assert(!resolved_method->has_itable_index(), "");
1389 vtable_index = resolved_method->vtable_index();
1390 // We could get a negative vtable_index of nonvirtual_vtable_index for private
1391 // methods, or for final methods. Private methods never appear in the vtable
1392 // and never override other methods. As an optimization, final methods are
1393 // never put in the vtable, unless they override an existing method.
1394 // So if we do get nonvirtual_vtable_index, it means the selected method is the
1395 // resolved method, and it can never be changed by an override.
1396 if (vtable_index == Method::nonvirtual_vtable_index) {
1397 assert(resolved_method->can_be_statically_bound(), "cannot override this method");
1398 selected_method = resolved_method;
1399 } else {
1400 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1401 }
1402 }
1403
1404 // check if method exists
1405 if (selected_method.is_null()) {
1406 throw_abstract_method_error(resolved_method, recv_klass, CHECK);
1407 }
1408
1409 // check if abstract
1410 if (check_null_and_abstract && selected_method->is_abstract()) {
1411 // Pass arguments for generating a verbose error message.
1412 throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK);
1413 }
1414
1415 if (log_develop_is_enabled(Trace, vtables)) {
1416 trace_method_resolution("invokevirtual selected method: receiver-class:",
1417 recv_klass, resolved_klass, selected_method(),
1418 false, vtable_index);
1419 }
1420 // setup result
1421 result.set_virtual(resolved_klass, resolved_method, selected_method, vtable_index, CHECK);
1422 }
1423
1424 void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, Klass* recv_klass,
1425 const LinkInfo& link_info,
1426 bool check_null_and_abstract, TRAPS) {
1427 // throws linktime exceptions
1428 Method* resolved_method = linktime_resolve_interface_method(link_info, CHECK);
1429 methodHandle mh(THREAD, resolved_method);
1430 runtime_resolve_interface_method(result, mh, link_info.resolved_klass(),
1431 recv, recv_klass, check_null_and_abstract, CHECK);
1432 }
1433
1434 Method* LinkResolver::linktime_resolve_interface_method(const LinkInfo& link_info,
1435 TRAPS) {
1436 // normal interface method resolution
1437 Method* resolved_method = resolve_interface_method(link_info, Bytecodes::_invokeinterface, CHECK_NULL);
1438 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1439 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1440
1441 return resolved_method;
1442 }
1443
1444 // throws runtime exceptions
1445 void LinkResolver::runtime_resolve_interface_method(CallInfo& result,
1446 const methodHandle& resolved_method,
1447 Klass* resolved_klass,
1448 Handle recv,
1449 Klass* recv_klass,
1450 bool check_null_and_abstract, TRAPS) {
1451
1452 // check if receiver exists
1453 if (check_null_and_abstract && recv.is_null()) {
1454 THROW(vmSymbols::java_lang_NullPointerException());
1455 }
1456
1457 // check if receiver klass implements the resolved interface
1458 if (!recv_klass->is_subtype_of(resolved_klass)) {
1459 ResourceMark rm(THREAD);
1460 char buf[200];
1461 jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s",
1462 recv_klass->external_name(),
1463 resolved_klass->external_name());
1464 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1465 }
1466
1467 methodHandle selected_method = resolved_method;
1468
1469 // resolve the method in the receiver class, unless it is private
1470 if (!resolved_method()->is_private()) {
1471 // do lookup based on receiver klass
1472 // This search must match the linktime preparation search for itable initialization
1473 // to correctly enforce loader constraints for interface method inheritance.
1474 // Private methods are skipped as the resolved method was not private.
1475 Method* method = lookup_instance_method_in_klasses(recv_klass,
1476 resolved_method->name(),
1477 resolved_method->signature(),
1478 Klass::skip_private, CHECK);
1479 selected_method = methodHandle(THREAD, method);
1480
1481 if (selected_method.is_null() && !check_null_and_abstract) {
1482 // In theory this is a harmless placeholder value, but
1483 // in practice leaving in null affects the nsk default method tests.
1484 // This needs further study.
1485 selected_method = resolved_method;
1486 }
1487 // check if method exists
1488 if (selected_method.is_null()) {
1489 // Pass arguments for generating a verbose error message.
1490 throw_abstract_method_error(resolved_method, recv_klass, CHECK);
1491 }
1492 // check access
1493 // Throw Illegal Access Error if selected_method is not public.
1494 if (!selected_method->is_public()) {
1495 ResourceMark rm(THREAD);
1496 stringStream ss;
1497 ss.print("'");
1498 Method::print_external_name(&ss, recv_klass, selected_method->name(), selected_method->signature());
1499 ss.print("'");
1500 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
1501 }
1502 // check if abstract
1503 if (check_null_and_abstract && selected_method->is_abstract()) {
1504 throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK);
1505 }
1506 }
1507
1508 if (log_develop_is_enabled(Trace, itables)) {
1509 trace_method_resolution("invokeinterface selected method: receiver-class:",
1510 recv_klass, resolved_klass, selected_method(), true);
1511 }
1512 // setup result
1513 if (resolved_method->has_vtable_index()) {
1514 int vtable_index = resolved_method->vtable_index();
1515 log_develop_trace(itables)(" -- vtable index: %d", vtable_index);
1516 assert(vtable_index == selected_method->vtable_index(), "sanity check");
1517 result.set_virtual(resolved_klass, resolved_method, selected_method, vtable_index, CHECK);
1518 } else if (resolved_method->has_itable_index()) {
1519 int itable_index = resolved_method()->itable_index();
1520 log_develop_trace(itables)(" -- itable index: %d", itable_index);
1521 result.set_interface(resolved_klass, resolved_method, selected_method, itable_index, CHECK);
1522 } else {
1523 int index = resolved_method->vtable_index();
1524 log_develop_trace(itables)(" -- non itable/vtable index: %d", index);
1525 assert(index == Method::nonvirtual_vtable_index, "Oops hit another case!");
1526 assert(resolved_method()->is_private() ||
1527 (resolved_method()->is_final() && resolved_method->method_holder() == SystemDictionary::Object_klass()),
1528 "Should only have non-virtual invokeinterface for private or final-Object methods!");
1529 assert(resolved_method()->can_be_statically_bound(), "Should only have non-virtual invokeinterface for statically bound methods!");
1530 // This sets up the nonvirtual form of "virtual" call (as needed for final and private methods)
1531 result.set_virtual(resolved_klass, resolved_method, resolved_method, index, CHECK);
1532 }
1533 }
1534
1535
1536 Method* LinkResolver::linktime_resolve_interface_method_or_null(
1537 const LinkInfo& link_info) {
1538 EXCEPTION_MARK;
1539 Method* method_result = linktime_resolve_interface_method(link_info, THREAD);
1540 if (HAS_PENDING_EXCEPTION) {
1541 CLEAR_PENDING_EXCEPTION;
1542 return NULL;
1543 } else {
1544 return method_result;
1545 }
1546 }
1547
1548 Method* LinkResolver::linktime_resolve_virtual_method_or_null(
1549 const LinkInfo& link_info) {
1550 EXCEPTION_MARK;
1551 Method* method_result = linktime_resolve_virtual_method(link_info, THREAD);
1552 if (HAS_PENDING_EXCEPTION) {
1553 CLEAR_PENDING_EXCEPTION;
1554 return NULL;
1555 } else {
1556 return method_result;
1557 }
1558 }
1559
1560 Method* LinkResolver::resolve_virtual_call_or_null(
1561 Klass* receiver_klass,
1562 const LinkInfo& link_info) {
1563 EXCEPTION_MARK;
1564 CallInfo info;
1565 resolve_virtual_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1566 if (HAS_PENDING_EXCEPTION) {
1567 CLEAR_PENDING_EXCEPTION;
1568 return NULL;
1569 }
1570 return info.selected_method();
1571 }
1572
1573 Method* LinkResolver::resolve_interface_call_or_null(
1574 Klass* receiver_klass,
1575 const LinkInfo& link_info) {
1576 EXCEPTION_MARK;
1577 CallInfo info;
1578 resolve_interface_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1579 if (HAS_PENDING_EXCEPTION) {
1580 CLEAR_PENDING_EXCEPTION;
1581 return NULL;
1582 }
1583 return info.selected_method();
1584 }
1585
1586 int LinkResolver::resolve_virtual_vtable_index(Klass* receiver_klass,
1587 const LinkInfo& link_info) {
1588 EXCEPTION_MARK;
1589 CallInfo info;
1590 resolve_virtual_call(info, Handle(), receiver_klass, link_info,
1591 /*check_null_or_abstract*/false, THREAD);
1592 if (HAS_PENDING_EXCEPTION) {
1593 CLEAR_PENDING_EXCEPTION;
1594 return Method::invalid_vtable_index;
1595 }
1596 return info.vtable_index();
1597 }
1598
1599 Method* LinkResolver::resolve_static_call_or_null(const LinkInfo& link_info) {
1600 EXCEPTION_MARK;
1601 CallInfo info;
1602 resolve_static_call(info, link_info, /*initialize_class*/false, THREAD);
1603 if (HAS_PENDING_EXCEPTION) {
1604 CLEAR_PENDING_EXCEPTION;
1605 return NULL;
1606 }
1607 return info.selected_method();
1608 }
1609
1610 Method* LinkResolver::resolve_special_call_or_null(const LinkInfo& link_info) {
1611 EXCEPTION_MARK;
1612 CallInfo info;
1613 resolve_special_call(info, Handle(), link_info, THREAD);
1614 if (HAS_PENDING_EXCEPTION) {
1615 CLEAR_PENDING_EXCEPTION;
1616 return NULL;
1617 }
1618 return info.selected_method();
1619 }
1620
1621
1622
1623 //------------------------------------------------------------------------------------------------------------------------
1624 // ConstantPool entries
1625
1626 void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) {
1627 switch (byte) {
1628 case Bytecodes::_invokestatic : resolve_invokestatic (result, pool, index, CHECK); break;
1629 case Bytecodes::_invokespecial : resolve_invokespecial (result, recv, pool, index, CHECK); break;
1630 case Bytecodes::_invokevirtual : resolve_invokevirtual (result, recv, pool, index, CHECK); break;
1631 case Bytecodes::_invokehandle : resolve_invokehandle (result, pool, index, CHECK); break;
1632 case Bytecodes::_invokedynamic : resolve_invokedynamic (result, pool, index, CHECK); break;
1633 case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break;
1634 default : break;
1635 }
1636 return;
1637 }
1638
1639 void LinkResolver::resolve_invoke(CallInfo& result, Handle& recv,
1640 const methodHandle& attached_method,
1641 Bytecodes::Code byte, TRAPS) {
1642 Klass* defc = attached_method->method_holder();
1643 Symbol* name = attached_method->name();
1644 Symbol* type = attached_method->signature();
1645 LinkInfo link_info(defc, name, type);
1646 switch(byte) {
1647 case Bytecodes::_invokevirtual:
1648 resolve_virtual_call(result, recv, recv->klass(), link_info,
1649 /*check_null_and_abstract=*/true, CHECK);
1650 break;
1651 case Bytecodes::_invokeinterface:
1652 resolve_interface_call(result, recv, recv->klass(), link_info,
1653 /*check_null_and_abstract=*/true, CHECK);
1654 break;
1655 case Bytecodes::_invokestatic:
1656 resolve_static_call(result, link_info, /*initialize_class=*/false, CHECK);
1657 break;
1658 case Bytecodes::_invokespecial:
1659 resolve_special_call(result, recv, link_info, CHECK);
1660 break;
1661 default:
1662 fatal("bad call: %s", Bytecodes::name(byte));
1663 break;
1664 }
1665 }
1666
1667 void LinkResolver::resolve_invokestatic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1668 LinkInfo link_info(pool, index, CHECK);
1669 resolve_static_call(result, link_info, /*initialize_class*/true, CHECK);
1670 }
1671
1672
1673 void LinkResolver::resolve_invokespecial(CallInfo& result, Handle recv,
1674 const constantPoolHandle& pool, int index, TRAPS) {
1675 LinkInfo link_info(pool, index, CHECK);
1676 resolve_special_call(result, recv, link_info, CHECK);
1677 }
1678
1679
1680 void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv,
1681 const constantPoolHandle& pool, int index,
1682 TRAPS) {
1683
1684 LinkInfo link_info(pool, index, CHECK);
1685 Klass* recvrKlass = recv.is_null() ? (Klass*)NULL : recv->klass();
1686 resolve_virtual_call(result, recv, recvrKlass, link_info, /*check_null_or_abstract*/true, CHECK);
1687 }
1688
1689
1690 void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, TRAPS) {
1691 LinkInfo link_info(pool, index, CHECK);
1692 Klass* recvrKlass = recv.is_null() ? (Klass*)NULL : recv->klass();
1693 resolve_interface_call(result, recv, recvrKlass, link_info, true, CHECK);
1694 }
1695
1696
1697 void LinkResolver::resolve_invokehandle(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1698 // This guy is reached from InterpreterRuntime::resolve_invokehandle.
1699 LinkInfo link_info(pool, index, CHECK);
1700 if (log_is_enabled(Info, methodhandles)) {
1701 ResourceMark rm(THREAD);
1702 log_info(methodhandles)("resolve_invokehandle %s %s", link_info.name()->as_C_string(),
1703 link_info.signature()->as_C_string());
1704 }
1705 resolve_handle_call(result, link_info, CHECK);
1706 }
1707
1708 void LinkResolver::resolve_handle_call(CallInfo& result,
1709 const LinkInfo& link_info,
1710 TRAPS) {
1711 // JSR 292: this must be an implicitly generated method MethodHandle.invokeExact(*...) or similar
1712 Klass* resolved_klass = link_info.resolved_klass();
1713 assert(resolved_klass == SystemDictionary::MethodHandle_klass() ||
1714 resolved_klass == SystemDictionary::VarHandle_klass(), "");
1715 assert(MethodHandles::is_signature_polymorphic_name(link_info.name()), "");
1716 Handle resolved_appendix;
1717 Method* resolved_method = lookup_polymorphic_method(link_info, &resolved_appendix, CHECK);
1718 result.set_handle(resolved_klass, methodHandle(THREAD, resolved_method), resolved_appendix, CHECK);
1719 }
1720
1721 void LinkResolver::resolve_invokedynamic(CallInfo& result, const constantPoolHandle& pool, int indy_index, TRAPS) {
1722 ConstantPoolCacheEntry* cpce = pool->invokedynamic_cp_cache_entry_at(indy_index);
1723 int pool_index = cpce->constant_pool_index();
1724
1725 // Resolve the bootstrap specifier (BSM + optional arguments).
1726 BootstrapInfo bootstrap_specifier(pool, pool_index, indy_index);
1727
1728 // Check if CallSite has been bound already or failed already, and short circuit:
1729 {
1730 bool is_done = bootstrap_specifier.resolve_previously_linked_invokedynamic(result, CHECK);
1731 if (is_done) return;
1732 }
1733
1734 // The initial step in Call Site Specifier Resolution is to resolve the symbolic
1735 // reference to a method handle which will be the bootstrap method for a dynamic
1736 // call site. If resolution for the java.lang.invoke.MethodHandle for the bootstrap
1737 // method fails, then a MethodHandleInError is stored at the corresponding bootstrap
1738 // method's CP index for the CONSTANT_MethodHandle_info. So, there is no need to
1739 // set the indy_rf flag since any subsequent invokedynamic instruction which shares
1740 // this bootstrap method will encounter the resolution of MethodHandleInError.
1741
1742 resolve_dynamic_call(result, bootstrap_specifier, CHECK);
1743
1744 LogTarget(Debug, methodhandles, indy) lt_indy;
1745 if (lt_indy.is_enabled()) {
1746 LogStream ls(lt_indy);
1747 bootstrap_specifier.print_msg_on(&ls, "resolve_invokedynamic");
1748 }
1749
1750 // The returned linkage result is provisional up to the moment
1751 // the interpreter or runtime performs a serialized check of
1752 // the relevant CPCE::f1 field. This is done by the caller
1753 // of this method, via CPCE::set_dynamic_call, which uses
1754 // an ObjectLocker to do the final serialization of updates
1755 // to CPCE state, including f1.
1756 }
1757
1758 void LinkResolver::resolve_dynamic_call(CallInfo& result,
1759 BootstrapInfo& bootstrap_specifier,
1760 TRAPS) {
1761 // JSR 292: this must resolve to an implicitly generated method
1762 // such as MH.linkToCallSite(*...) or some other call-site shape.
1763 // The appendix argument is likely to be a freshly-created CallSite.
1764 // It may also be a MethodHandle from an unwrapped ConstantCallSite,
1765 // or any other reference. The resolved_method as well as the appendix
1766 // are both recorded together via CallInfo::set_handle.
1767 SystemDictionary::invoke_bootstrap_method(bootstrap_specifier, THREAD);
1768 Exceptions::wrap_dynamic_exception(/* is_indy */ true, THREAD);
1769
1770 if (HAS_PENDING_EXCEPTION) {
1771 if (!PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1772 // Let any random low-level IE or SOE or OOME just bleed through.
1773 // Basically we pretend that the bootstrap method was never called,
1774 // if it fails this way: We neither record a successful linkage,
1775 // nor do we memorize a LE for posterity.
1776 return;
1777 }
1778 // JVMS 5.4.3 says: If an attempt by the Java Virtual Machine to resolve
1779 // a symbolic reference fails because an error is thrown that is an
1780 // instance of LinkageError (or a subclass), then subsequent attempts to
1781 // resolve the reference always fail with the same error that was thrown
1782 // as a result of the initial resolution attempt.
1783 bool recorded_res_status = bootstrap_specifier.save_and_throw_indy_exc(CHECK);
1784 if (!recorded_res_status) {
1785 // Another thread got here just before we did. So, either use the method
1786 // that it resolved or throw the LinkageError exception that it threw.
1787 bool is_done = bootstrap_specifier.resolve_previously_linked_invokedynamic(result, CHECK);
1788 if (is_done) return;
1789 }
1790 assert(bootstrap_specifier.invokedynamic_cp_cache_entry()->indy_resolution_failed(),
1791 "Resolution failure flag wasn't set");
1792 }
1793
1794 bootstrap_specifier.resolve_newly_linked_invokedynamic(result, CHECK);
1795 // Exceptions::wrap_dynamic_exception not used because
1796 // set_handle doesn't throw linkage errors
1797 }
1798
1799 // Selected method is abstract.
1800 void LinkResolver::throw_abstract_method_error(const methodHandle& resolved_method,
1801 const methodHandle& selected_method,
1802 Klass *recv_klass, TRAPS) {
1803 Klass *resolved_klass = resolved_method->method_holder();
1804 ResourceMark rm(THREAD);
1805 stringStream ss;
1806
1807 if (recv_klass != NULL) {
1808 ss.print("Receiver class %s does not define or inherit an "
1809 "implementation of the",
1810 recv_klass->external_name());
1811 } else {
1812 ss.print("Missing implementation of");
1813 }
1814
1815 assert(resolved_method.not_null(), "Sanity");
1816 ss.print(" resolved method '%s%s",
1817 resolved_method->is_abstract() ? "abstract " : "",
1818 resolved_method->is_private() ? "private " : "");
1819 resolved_method->signature()->print_as_signature_external_return_type(&ss);
1820 ss.print(" %s(", resolved_method->name()->as_C_string());
1821 resolved_method->signature()->print_as_signature_external_parameters(&ss);
1822 ss.print(")' of %s %s.",
1823 resolved_klass->external_kind(),
1824 resolved_klass->external_name());
1825
1826 if (selected_method.not_null() && !(resolved_method == selected_method)) {
1827 ss.print(" Selected method is '%s%s",
1828 selected_method->is_abstract() ? "abstract " : "",
1829 selected_method->is_private() ? "private " : "");
1830 selected_method->print_external_name(&ss);
1831 ss.print("'.");
1832 }
1833
1834 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1835 }