1 /* 2 * Copyright (c) 1997, 2018, 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/compileBroker.hpp" 34 #include "gc/shared/collectedHeap.inline.hpp" 35 #include "interpreter/bytecode.hpp" 36 #include "interpreter/interpreterRuntime.hpp" 37 #include "interpreter/linkResolver.hpp" 38 #include "logging/log.hpp" 39 #include "logging/logStream.hpp" 40 #include "memory/resourceArea.hpp" 41 #include "memory/universe.hpp" 42 #include "oops/cpCache.inline.hpp" 43 #include "oops/instanceKlass.hpp" 44 #include "oops/method.hpp" 45 #include "oops/objArrayKlass.hpp" 46 #include "oops/objArrayOop.hpp" 47 #include "oops/oop.inline.hpp" 48 #include "prims/methodHandles.hpp" 49 #include "prims/nativeLookup.hpp" 50 #include "runtime/compilationPolicy.hpp" 51 #include "runtime/fieldDescriptor.hpp" 52 #include "runtime/frame.inline.hpp" 53 #include "runtime/handles.inline.hpp" 54 #include "runtime/reflection.hpp" 55 #include "runtime/safepointVerifiers.hpp" 56 #include "runtime/signature.hpp" 57 #include "runtime/thread.inline.hpp" 58 #include "runtime/vmThread.hpp" 59 60 //------------------------------------------------------------------------------------------------------------------------ 61 // Implementation of CallInfo 62 63 64 void CallInfo::set_static(Klass* resolved_klass, const methodHandle& resolved_method, TRAPS) { 65 int vtable_index = Method::nonvirtual_vtable_index; 66 set_common(resolved_klass, resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK); 67 } 68 69 70 void CallInfo::set_interface(Klass* resolved_klass, 71 Klass* selected_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, selected_klass, resolved_method, selected_method, CallInfo::itable_call, itable_index, CHECK); 82 } 83 84 void CallInfo::set_virtual(Klass* resolved_klass, 85 Klass* selected_klass, 86 const methodHandle& resolved_method, 87 const methodHandle& selected_method, 88 int vtable_index, TRAPS) { 89 assert(vtable_index >= 0 || vtable_index == Method::nonvirtual_vtable_index, "valid index"); 90 assert(vtable_index < 0 || !resolved_method->has_vtable_index() || vtable_index == resolved_method->vtable_index(), ""); 91 CallKind kind = (vtable_index >= 0 && !resolved_method->can_be_statically_bound() ? CallInfo::vtable_call : CallInfo::direct_call); 92 set_common(resolved_klass, selected_klass, resolved_method, selected_method, kind, vtable_index, CHECK); 93 assert(!resolved_method->is_compiled_lambda_form(), "these must be handled via an invokehandle call"); 94 } 95 96 void CallInfo::set_handle(const methodHandle& resolved_method, 97 Handle resolved_appendix, 98 Handle resolved_method_type, TRAPS) { 99 set_handle(SystemDictionary::MethodHandle_klass(), resolved_method, resolved_appendix, resolved_method_type, CHECK); 100 } 101 102 void CallInfo::set_handle(Klass* resolved_klass, 103 const methodHandle& resolved_method, 104 Handle resolved_appendix, 105 Handle resolved_method_type, TRAPS) { 106 if (resolved_method.is_null()) { 107 THROW_MSG(vmSymbols::java_lang_InternalError(), "resolved method is null"); 108 } 109 assert(resolved_method->intrinsic_id() == vmIntrinsics::_invokeBasic || 110 resolved_method->is_compiled_lambda_form(), 111 "linkMethod must return one of these"); 112 int vtable_index = Method::nonvirtual_vtable_index; 113 assert(!resolved_method->has_vtable_index(), ""); 114 set_common(resolved_klass, resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK); 115 _resolved_appendix = resolved_appendix; 116 _resolved_method_type = resolved_method_type; 117 } 118 119 void CallInfo::set_common(Klass* resolved_klass, 120 Klass* selected_klass, 121 const methodHandle& resolved_method, 122 const methodHandle& selected_method, 123 CallKind kind, 124 int index, 125 TRAPS) { 126 assert(resolved_method->signature() == selected_method->signature(), "signatures must correspond"); 127 _resolved_klass = resolved_klass; 128 _selected_klass = selected_klass; 129 _resolved_method = resolved_method; 130 _selected_method = selected_method; 131 _call_kind = kind; 132 _call_index = index; 133 _resolved_appendix = Handle(); 134 DEBUG_ONLY(verify()); // verify before making side effects 135 136 CompilationPolicy::compile_if_required(selected_method, THREAD); 137 } 138 139 // utility query for unreflecting a method 140 CallInfo::CallInfo(Method* resolved_method, Klass* resolved_klass, TRAPS) { 141 Klass* resolved_method_holder = resolved_method->method_holder(); 142 if (resolved_klass == NULL) { // 2nd argument defaults to holder of 1st 143 resolved_klass = resolved_method_holder; 144 } 145 _resolved_klass = resolved_klass; 146 _selected_klass = resolved_klass; 147 _resolved_method = resolved_method; 148 _selected_method = resolved_method; 149 // classify: 150 CallKind kind = CallInfo::unknown_kind; 151 int index = resolved_method->vtable_index(); 152 if (resolved_method->can_be_statically_bound()) { 153 kind = CallInfo::direct_call; 154 } else if (!resolved_method_holder->is_interface()) { 155 // Could be an Object method inherited into an interface, but still a vtable call. 156 kind = CallInfo::vtable_call; 157 } else if (!resolved_klass->is_interface()) { 158 // A default or miranda method. Compute the vtable index. 159 index = LinkResolver::vtable_index_of_interface_method(resolved_klass, 160 resolved_method); 161 assert(index >= 0 , "we should have valid vtable index at this point"); 162 163 kind = CallInfo::vtable_call; 164 } else if (resolved_method->has_vtable_index()) { 165 // Can occur if an interface redeclares a method of Object. 166 167 #ifdef ASSERT 168 // Ensure that this is really the case. 169 Klass* object_klass = SystemDictionary::Object_klass(); 170 Method * object_resolved_method = object_klass->vtable().method_at(index); 171 assert(object_resolved_method->name() == resolved_method->name(), 172 "Object and interface method names should match at vtable index %d, %s != %s", 173 index, object_resolved_method->name()->as_C_string(), resolved_method->name()->as_C_string()); 174 assert(object_resolved_method->signature() == resolved_method->signature(), 175 "Object and interface method signatures should match at vtable index %d, %s != %s", 176 index, object_resolved_method->signature()->as_C_string(), resolved_method->signature()->as_C_string()); 177 #endif // ASSERT 178 179 kind = CallInfo::vtable_call; 180 } else { 181 // A regular interface call. 182 kind = CallInfo::itable_call; 183 index = resolved_method->itable_index(); 184 } 185 assert(index == Method::nonvirtual_vtable_index || index >= 0, "bad index %d", index); 186 _call_kind = kind; 187 _call_index = index; 188 _resolved_appendix = Handle(); 189 // Find or create a ResolvedMethod instance for this Method* 190 set_resolved_method_name(CHECK); 191 192 DEBUG_ONLY(verify()); 193 } 194 195 void CallInfo::set_resolved_method_name(TRAPS) { 196 Method* m = _resolved_method(); 197 assert(m != NULL, "Should already have a Method*"); 198 oop rmethod_name = java_lang_invoke_ResolvedMethodName::find_resolved_method(m, CHECK); 199 _resolved_method_name = Handle(THREAD, rmethod_name); 200 } 201 202 #ifdef ASSERT 203 void CallInfo::verify() { 204 switch (call_kind()) { // the meaning and allowed value of index depends on kind 205 case CallInfo::direct_call: 206 if (_call_index == Method::nonvirtual_vtable_index) break; 207 // else fall through to check vtable index: 208 case CallInfo::vtable_call: 209 assert(resolved_klass()->verify_vtable_index(_call_index), ""); 210 break; 211 case CallInfo::itable_call: 212 assert(resolved_method()->method_holder()->verify_itable_index(_call_index), ""); 213 break; 214 case CallInfo::unknown_kind: 215 assert(call_kind() != CallInfo::unknown_kind, "CallInfo must be set"); 216 break; 217 default: 218 fatal("Unexpected call kind %d", call_kind()); 219 } 220 } 221 #endif //ASSERT 222 223 #ifndef PRODUCT 224 void CallInfo::print() { 225 ResourceMark rm; 226 const char* kindstr; 227 switch (_call_kind) { 228 case direct_call: kindstr = "direct"; break; 229 case vtable_call: kindstr = "vtable"; break; 230 case itable_call: kindstr = "itable"; break; 231 default : kindstr = "unknown"; break; 232 } 233 tty->print_cr("Call %s@%d %s", kindstr, _call_index, 234 _resolved_method.is_null() ? "(none)" : _resolved_method->name_and_sig_as_C_string()); 235 } 236 #endif 237 238 //------------------------------------------------------------------------------------------------------------------------ 239 // Implementation of LinkInfo 240 241 LinkInfo::LinkInfo(const constantPoolHandle& pool, int index, const methodHandle& current_method, TRAPS) { 242 // resolve klass 243 _resolved_klass = pool->klass_ref_at(index, CHECK); 244 245 // Get name, signature, and static klass 246 _name = pool->name_ref_at(index); 247 _signature = pool->signature_ref_at(index); 248 _tag = pool->tag_ref_at(index); 249 _current_klass = pool->pool_holder(); 250 _current_method = current_method; 251 252 // Coming from the constant pool always checks access 253 _check_access = true; 254 } 255 256 LinkInfo::LinkInfo(const constantPoolHandle& pool, int index, TRAPS) { 257 // resolve klass 258 _resolved_klass = pool->klass_ref_at(index, CHECK); 259 260 // Get name, signature, and static klass 261 _name = pool->name_ref_at(index); 262 _signature = pool->signature_ref_at(index); 263 _tag = pool->tag_ref_at(index); 264 _current_klass = pool->pool_holder(); 265 _current_method = methodHandle(); 266 267 // Coming from the constant pool always checks access 268 _check_access = true; 269 } 270 271 char* LinkInfo::method_string() const { 272 return Method::name_and_sig_as_C_string(_resolved_klass, _name, _signature); 273 } 274 275 #ifndef PRODUCT 276 void LinkInfo::print() { 277 ResourceMark rm; 278 tty->print_cr("Link resolved_klass=%s name=%s signature=%s current_klass=%s check_access=%s", 279 _resolved_klass->name()->as_C_string(), 280 _name->as_C_string(), 281 _signature->as_C_string(), 282 _current_klass == NULL ? "(none)" : _current_klass->name()->as_C_string(), 283 _check_access ? "true" : "false"); 284 } 285 #endif // PRODUCT 286 //------------------------------------------------------------------------------------------------------------------------ 287 // Klass resolution 288 289 void LinkResolver::check_klass_accessability(Klass* ref_klass, Klass* sel_klass, 290 bool fold_type_to_class, TRAPS) { 291 Klass* base_klass = sel_klass; 292 if (fold_type_to_class) { 293 if (sel_klass->is_objArray_klass()) { 294 base_klass = ObjArrayKlass::cast(sel_klass)->bottom_klass(); 295 } 296 // The element type could be a typeArray - we only need the access 297 // check if it is an reference to another class. 298 if (!base_klass->is_instance_klass()) { 299 return; // no relevant check to do 300 } 301 } 302 Reflection::VerifyClassAccessResults vca_result = 303 Reflection::verify_class_access(ref_klass, InstanceKlass::cast(base_klass), true); 304 if (vca_result != Reflection::ACCESS_OK) { 305 ResourceMark rm(THREAD); 306 char* msg = Reflection::verify_class_access_msg(ref_klass, 307 InstanceKlass::cast(base_klass), 308 vca_result); 309 if (msg == NULL) { 310 Exceptions::fthrow( 311 THREAD_AND_LOCATION, 312 vmSymbols::java_lang_IllegalAccessError(), 313 "failed to access class %s from class %s", 314 base_klass->external_name(), 315 ref_klass->external_name()); 316 } else { 317 // Use module specific message returned by verify_class_access_msg(). 318 Exceptions::fthrow( 319 THREAD_AND_LOCATION, 320 vmSymbols::java_lang_IllegalAccessError(), 321 "%s", msg); 322 } 323 } 324 } 325 326 //------------------------------------------------------------------------------------------------------------------------ 327 // Method resolution 328 // 329 // According to JVM spec. $5.4.3c & $5.4.3d 330 331 // Look up method in klasses, including static methods 332 // Then look up local default methods 333 Method* LinkResolver::lookup_method_in_klasses(const LinkInfo& link_info, 334 bool checkpolymorphism, 335 bool in_imethod_resolve) { 336 NoSafepointVerifier nsv; // Method* returned may not be reclaimed 337 338 Klass* klass = link_info.resolved_klass(); 339 Symbol* name = link_info.name(); 340 Symbol* signature = link_info.signature(); 341 342 // Ignore overpasses so statics can be found during resolution 343 Method* result = klass->uncached_lookup_method(name, signature, Klass::skip_overpass); 344 345 if (klass->is_array_klass()) { 346 // Only consider klass and super klass for arrays 347 return result; 348 } 349 350 InstanceKlass* ik = InstanceKlass::cast(klass); 351 352 // JDK 8, JVMS 5.4.3.4: Interface method resolution should 353 // ignore static and non-public methods of java.lang.Object, 354 // like clone, finalize, registerNatives. 355 if (in_imethod_resolve && 356 result != NULL && 357 ik->is_interface() && 358 (result->is_static() || !result->is_public()) && 359 result->method_holder() == SystemDictionary::Object_klass()) { 360 result = NULL; 361 } 362 363 // Before considering default methods, check for an overpass in the 364 // current class if a method has not been found. 365 if (result == NULL) { 366 result = ik->find_method(name, signature); 367 } 368 369 if (result == NULL) { 370 Array<Method*>* default_methods = ik->default_methods(); 371 if (default_methods != NULL) { 372 result = InstanceKlass::find_method(default_methods, name, signature); 373 } 374 } 375 376 if (checkpolymorphism && result != NULL) { 377 vmIntrinsics::ID iid = result->intrinsic_id(); 378 if (MethodHandles::is_signature_polymorphic(iid)) { 379 // Do not link directly to these. The VM must produce a synthetic one using lookup_polymorphic_method. 380 return NULL; 381 } 382 } 383 return result; 384 } 385 386 // returns first instance method 387 // Looks up method in classes, then looks up local default methods 388 methodHandle LinkResolver::lookup_instance_method_in_klasses(Klass* klass, 389 Symbol* name, 390 Symbol* signature, 391 Klass::PrivateLookupMode private_mode, TRAPS) { 392 Method* result = klass->uncached_lookup_method(name, signature, Klass::find_overpass, private_mode); 393 394 while (result != NULL && result->is_static() && result->method_holder()->super() != NULL) { 395 Klass* super_klass = result->method_holder()->super(); 396 result = super_klass->uncached_lookup_method(name, signature, Klass::find_overpass, private_mode); 397 } 398 399 if (klass->is_array_klass()) { 400 // Only consider klass and super klass for arrays 401 return methodHandle(THREAD, result); 402 } 403 404 if (result == NULL) { 405 Array<Method*>* default_methods = InstanceKlass::cast(klass)->default_methods(); 406 if (default_methods != NULL) { 407 result = InstanceKlass::find_method(default_methods, name, signature); 408 assert(result == NULL || !result->is_static(), "static defaults not allowed"); 409 } 410 } 411 return methodHandle(THREAD, result); 412 } 413 414 int LinkResolver::vtable_index_of_interface_method(Klass* klass, 415 const methodHandle& resolved_method) { 416 417 int vtable_index = Method::invalid_vtable_index; 418 Symbol* name = resolved_method->name(); 419 Symbol* signature = resolved_method->signature(); 420 InstanceKlass* ik = InstanceKlass::cast(klass); 421 422 // First check in default method array 423 if (!resolved_method->is_abstract() && ik->default_methods() != NULL) { 424 int index = InstanceKlass::find_method_index(ik->default_methods(), 425 name, signature, Klass::find_overpass, 426 Klass::find_static, Klass::find_private); 427 if (index >= 0 ) { 428 vtable_index = ik->default_vtable_indices()->at(index); 429 } 430 } 431 if (vtable_index == Method::invalid_vtable_index) { 432 // get vtable_index for miranda methods 433 klassVtable vt = ik->vtable(); 434 vtable_index = vt.index_of_miranda(name, signature); 435 } 436 return vtable_index; 437 } 438 439 Method* LinkResolver::lookup_method_in_interfaces(const LinkInfo& cp_info) { 440 InstanceKlass *ik = InstanceKlass::cast(cp_info.resolved_klass()); 441 442 // Specify 'true' in order to skip default methods when searching the 443 // interfaces. Function lookup_method_in_klasses() already looked for 444 // the method in the default methods table. 445 return ik->lookup_method_in_all_interfaces(cp_info.name(), cp_info.signature(), Klass::skip_defaults); 446 } 447 448 methodHandle LinkResolver::lookup_polymorphic_method( 449 const LinkInfo& link_info, 450 Handle *appendix_result_or_null, 451 Handle *method_type_result, 452 TRAPS) { 453 Klass* klass = link_info.resolved_klass(); 454 Symbol* name = link_info.name(); 455 Symbol* full_signature = link_info.signature(); 456 457 vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name); 458 if (TraceMethodHandles) { 459 ResourceMark rm(THREAD); 460 tty->print_cr("lookup_polymorphic_method iid=%s %s.%s%s", 461 vmIntrinsics::name_at(iid), klass->external_name(), 462 name->as_C_string(), full_signature->as_C_string()); 463 } 464 if ((klass == SystemDictionary::MethodHandle_klass() || 465 klass == SystemDictionary::VarHandle_klass()) && 466 iid != vmIntrinsics::_none) { 467 if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) { 468 // Most of these do not need an up-call to Java to resolve, so can be done anywhere. 469 // Do not erase last argument type (MemberName) if it is a static linkTo method. 470 bool keep_last_arg = MethodHandles::is_signature_polymorphic_static(iid); 471 TempNewSymbol basic_signature = 472 MethodHandles::lookup_basic_type_signature(full_signature, keep_last_arg, CHECK_NULL); 473 if (TraceMethodHandles) { 474 ResourceMark rm(THREAD); 475 tty->print_cr("lookup_polymorphic_method %s %s => basic %s", 476 name->as_C_string(), 477 full_signature->as_C_string(), 478 basic_signature->as_C_string()); 479 } 480 methodHandle result = SystemDictionary::find_method_handle_intrinsic(iid, 481 basic_signature, 482 CHECK_NULL); 483 if (result.not_null()) { 484 assert(result->is_method_handle_intrinsic(), "MH.invokeBasic or MH.linkTo* intrinsic"); 485 assert(result->intrinsic_id() != vmIntrinsics::_invokeGeneric, "wrong place to find this"); 486 assert(basic_signature == result->signature(), "predict the result signature"); 487 if (TraceMethodHandles) { 488 ttyLocker ttyl; 489 tty->print("lookup_polymorphic_method => intrinsic "); 490 result->print_on(tty); 491 } 492 } 493 return result; 494 } else if (iid == vmIntrinsics::_invokeGeneric 495 && THREAD->can_call_java() 496 && appendix_result_or_null != NULL) { 497 // This is a method with type-checking semantics. 498 // We will ask Java code to spin an adapter method for it. 499 if (!MethodHandles::enabled()) { 500 // Make sure the Java part of the runtime has been booted up. 501 Klass* natives = SystemDictionary::MethodHandleNatives_klass(); 502 if (natives == NULL || InstanceKlass::cast(natives)->is_not_initialized()) { 503 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_invoke_MethodHandleNatives(), 504 Handle(), 505 Handle(), 506 true, 507 CHECK_NULL); 508 } 509 } 510 511 Handle appendix; 512 Handle method_type; 513 methodHandle result = SystemDictionary::find_method_handle_invoker( 514 klass, 515 name, 516 full_signature, 517 link_info.current_klass(), 518 &appendix, 519 &method_type, 520 CHECK_NULL); 521 if (TraceMethodHandles) { 522 ttyLocker ttyl; 523 tty->print("lookup_polymorphic_method => (via Java) "); 524 result->print_on(tty); 525 tty->print(" lookup_polymorphic_method => appendix = "); 526 if (appendix.is_null()) tty->print_cr("(none)"); 527 else appendix->print_on(tty); 528 } 529 if (result.not_null()) { 530 #ifdef ASSERT 531 ResourceMark rm(THREAD); 532 533 TempNewSymbol basic_signature = 534 MethodHandles::lookup_basic_type_signature(full_signature, CHECK_NULL); 535 int actual_size_of_params = result->size_of_parameters(); 536 int expected_size_of_params = ArgumentSizeComputer(basic_signature).size(); 537 // +1 for MethodHandle.this, +1 for trailing MethodType 538 if (!MethodHandles::is_signature_polymorphic_static(iid)) expected_size_of_params += 1; 539 if (appendix.not_null()) expected_size_of_params += 1; 540 if (actual_size_of_params != expected_size_of_params) { 541 tty->print_cr("*** basic_signature=%s", basic_signature->as_C_string()); 542 tty->print_cr("*** result for %s: ", vmIntrinsics::name_at(iid)); 543 result->print(); 544 } 545 assert(actual_size_of_params == expected_size_of_params, 546 "%d != %d", actual_size_of_params, expected_size_of_params); 547 #endif //ASSERT 548 549 assert(appendix_result_or_null != NULL, ""); 550 (*appendix_result_or_null) = appendix; 551 (*method_type_result) = method_type; 552 } 553 return result; 554 } 555 } 556 return NULL; 557 } 558 559 void LinkResolver::check_method_accessability(Klass* ref_klass, 560 Klass* resolved_klass, 561 Klass* sel_klass, 562 const methodHandle& sel_method, 563 TRAPS) { 564 565 AccessFlags flags = sel_method->access_flags(); 566 567 // Special case: arrays always override "clone". JVMS 2.15. 568 // If the resolved klass is an array class, and the declaring class 569 // is java.lang.Object and the method is "clone", set the flags 570 // to public. 571 // 572 // We'll check for the method name first, as that's most likely 573 // to be false (so we'll short-circuit out of these tests). 574 if (sel_method->name() == vmSymbols::clone_name() && 575 sel_klass == SystemDictionary::Object_klass() && 576 resolved_klass->is_array_klass()) { 577 // We need to change "protected" to "public". 578 assert(flags.is_protected(), "clone not protected?"); 579 jint new_flags = flags.as_int(); 580 new_flags = new_flags & (~JVM_ACC_PROTECTED); 581 new_flags = new_flags | JVM_ACC_PUBLIC; 582 flags.set_flags(new_flags); 583 } 584 // assert(extra_arg_result_or_null != NULL, "must be able to return extra argument"); 585 586 if (!Reflection::verify_field_access(ref_klass, 587 resolved_klass, 588 sel_klass, 589 flags, 590 true)) { 591 // Propagate any existing exceptions that may have been thrown 592 if (HAS_PENDING_EXCEPTION) { 593 return; 594 } 595 ResourceMark rm(THREAD); 596 Exceptions::fthrow( 597 THREAD_AND_LOCATION, 598 vmSymbols::java_lang_IllegalAccessError(), 599 "tried to access method %s.%s%s from class %s", 600 sel_klass->external_name(), 601 sel_method->name()->as_C_string(), 602 sel_method->signature()->as_C_string(), 603 ref_klass->external_name() 604 ); 605 return; 606 } 607 } 608 609 methodHandle LinkResolver::resolve_method_statically(Bytecodes::Code code, 610 const constantPoolHandle& pool, int index, TRAPS) { 611 // This method is used only 612 // (1) in C2 from InlineTree::ok_to_inline (via ciMethod::check_call), 613 // and 614 // (2) in Bytecode_invoke::static_target 615 // It appears to fail when applied to an invokeinterface call site. 616 // FIXME: Remove this method and ciMethod::check_call; refactor to use the other LinkResolver entry points. 617 // resolve klass 618 if (code == Bytecodes::_invokedynamic) { 619 Klass* resolved_klass = SystemDictionary::MethodHandle_klass(); 620 Symbol* method_name = vmSymbols::invoke_name(); 621 Symbol* method_signature = pool->signature_ref_at(index); 622 Klass* current_klass = pool->pool_holder(); 623 LinkInfo link_info(resolved_klass, method_name, method_signature, current_klass); 624 return resolve_method(link_info, code, THREAD); 625 } 626 627 LinkInfo link_info(pool, index, methodHandle(), CHECK_NULL); 628 Klass* resolved_klass = link_info.resolved_klass(); 629 630 if (pool->has_preresolution() 631 || (resolved_klass == SystemDictionary::MethodHandle_klass() && 632 MethodHandles::is_signature_polymorphic_name(resolved_klass, link_info.name()))) { 633 Method* result = ConstantPool::method_at_if_loaded(pool, index); 634 if (result != NULL) { 635 return methodHandle(THREAD, result); 636 } 637 } 638 639 if (code == Bytecodes::_invokeinterface) { 640 return resolve_interface_method(link_info, code, THREAD); 641 } else if (code == Bytecodes::_invokevirtual) { 642 return resolve_method(link_info, code, THREAD); 643 } else if (!resolved_klass->is_interface()) { 644 return resolve_method(link_info, code, THREAD); 645 } else { 646 return resolve_interface_method(link_info, code, THREAD); 647 } 648 } 649 650 // Check and print a loader constraint violation message for method or interface method 651 void LinkResolver::check_method_loader_constraints(const LinkInfo& link_info, 652 const methodHandle& resolved_method, 653 const char* method_type, TRAPS) { 654 Handle current_loader(THREAD, link_info.current_klass()->class_loader()); 655 Handle resolved_loader(THREAD, resolved_method->method_holder()->class_loader()); 656 657 ResourceMark rm(THREAD); 658 Symbol* failed_type_symbol = 659 SystemDictionary::check_signature_loaders(link_info.signature(), current_loader, 660 resolved_loader, true, CHECK); 661 if (failed_type_symbol != NULL) { 662 const char* msg = "loader constraint violation: when resolving %s" 663 " \"%s\" the class loader %s of the current class, %s," 664 " and the class loader %s for the method's defining class, %s, have" 665 " different Class objects for the type %s used in the signature"; 666 char* sig = link_info.method_string(); 667 const char* loader1_name = java_lang_ClassLoader::describe_external(current_loader()); 668 char* current = link_info.current_klass()->name()->as_C_string(); 669 const char* loader2_name = java_lang_ClassLoader::describe_external(resolved_loader()); 670 char* target = resolved_method->method_holder()->name()->as_C_string(); 671 char* failed_type_name = failed_type_symbol->as_C_string(); 672 size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1_name) + 673 strlen(current) + strlen(loader2_name) + strlen(target) + 674 strlen(failed_type_name) + strlen(method_type) + 1; 675 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); 676 jio_snprintf(buf, buflen, msg, method_type, sig, loader1_name, current, loader2_name, 677 target, failed_type_name); 678 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); 679 } 680 } 681 682 void LinkResolver::check_field_loader_constraints(Symbol* field, Symbol* sig, 683 Klass* current_klass, 684 Klass* sel_klass, TRAPS) { 685 Handle ref_loader(THREAD, current_klass->class_loader()); 686 Handle sel_loader(THREAD, sel_klass->class_loader()); 687 688 ResourceMark rm(THREAD); // needed for check_signature_loaders 689 Symbol* failed_type_symbol = 690 SystemDictionary::check_signature_loaders(sig, 691 ref_loader, sel_loader, 692 false, 693 CHECK); 694 if (failed_type_symbol != NULL) { 695 const char* msg = "loader constraint violation: when resolving field" 696 " \"%s\" the class loader %s of the referring class, " 697 "%s, and the class loader %s for the field's resolved " 698 "type, %s, have different Class objects for that type"; 699 char* field_name = field->as_C_string(); 700 const char* loader1_name = java_lang_ClassLoader::describe_external(ref_loader()); 701 char* sel = sel_klass->name()->as_C_string(); 702 const char* loader2_name = java_lang_ClassLoader::describe_external(sel_loader()); 703 char* failed_type_name = failed_type_symbol->as_C_string(); 704 size_t buflen = strlen(msg) + strlen(field_name) + strlen(loader1_name) + 705 strlen(sel) + strlen(loader2_name) + strlen(failed_type_name) + 1; 706 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); 707 jio_snprintf(buf, buflen, msg, field_name, loader1_name, sel, loader2_name, 708 failed_type_name); 709 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); 710 } 711 } 712 713 methodHandle LinkResolver::resolve_method(const LinkInfo& link_info, 714 Bytecodes::Code code, TRAPS) { 715 716 Handle nested_exception; 717 Klass* resolved_klass = link_info.resolved_klass(); 718 719 // 1. For invokevirtual, cannot call an interface method 720 if (code == Bytecodes::_invokevirtual && resolved_klass->is_interface()) { 721 ResourceMark rm(THREAD); 722 char buf[200]; 723 jio_snprintf(buf, sizeof(buf), "Found interface %s, but class was expected", 724 resolved_klass->external_name()); 725 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 726 } 727 728 // 2. check constant pool tag for called method - must be JVM_CONSTANT_Methodref 729 if (!link_info.tag().is_invalid() && !link_info.tag().is_method()) { 730 ResourceMark rm(THREAD); 731 char buf[200]; 732 jio_snprintf(buf, sizeof(buf), "Method %s must be Methodref constant", link_info.method_string()); 733 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 734 } 735 736 // 3. lookup method in resolved klass and its super klasses 737 methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, true, false)); 738 739 // 4. lookup method in all the interfaces implemented by the resolved klass 740 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) { // not found in the class hierarchy 741 resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info)); 742 743 if (resolved_method.is_null()) { 744 // JSR 292: see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc 745 resolved_method = lookup_polymorphic_method(link_info, (Handle*)NULL, (Handle*)NULL, THREAD); 746 if (HAS_PENDING_EXCEPTION) { 747 nested_exception = Handle(THREAD, PENDING_EXCEPTION); 748 CLEAR_PENDING_EXCEPTION; 749 } 750 } 751 } 752 753 // 5. method lookup failed 754 if (resolved_method.is_null()) { 755 ResourceMark rm(THREAD); 756 THROW_MSG_CAUSE_(vmSymbols::java_lang_NoSuchMethodError(), 757 Method::name_and_sig_as_C_string(resolved_klass, 758 link_info.name(), 759 link_info.signature()), 760 nested_exception, NULL); 761 } 762 763 // 6. access checks, access checking may be turned off when calling from within the VM. 764 Klass* current_klass = link_info.current_klass(); 765 if (link_info.check_access()) { 766 assert(current_klass != NULL , "current_klass should not be null"); 767 768 // check if method can be accessed by the referring class 769 check_method_accessability(current_klass, 770 resolved_klass, 771 resolved_method->method_holder(), 772 resolved_method, 773 CHECK_NULL); 774 775 // check loader constraints 776 check_method_loader_constraints(link_info, resolved_method, "method", CHECK_NULL); 777 } 778 779 // For private method invocation we should only find the method in the resolved class. 780 // If that is not the case then we have a found a supertype method that we have nestmate 781 // access to. 782 // FIXME: the "ignoring xxx" part is for debugging only 783 if (resolved_method->is_private() && resolved_method->method_holder() != resolved_klass) { 784 ResourceMark rm(THREAD); 785 DEBUG_ONLY(bool is_nestmate = InstanceKlass::cast(link_info.current_klass())->has_nestmate_access_to(InstanceKlass::cast(resolved_klass), THREAD);) 786 assert(is_nestmate, "was only expecting nestmates to get here!"); 787 Exceptions::fthrow( 788 THREAD_AND_LOCATION, 789 vmSymbols::java_lang_NoSuchMethodError(), 790 "%s: method %s%s not found (ignoring %s)", 791 resolved_klass->external_name(), 792 resolved_method->name()->as_C_string(), 793 resolved_method->signature()->as_C_string(), 794 resolved_method->method_holder()->external_name() 795 ); 796 return NULL; 797 } 798 799 return resolved_method; 800 } 801 802 static void trace_method_resolution(const char* prefix, 803 Klass* klass, 804 Klass* resolved_klass, 805 const methodHandle& method, 806 bool logitables, 807 int index = -1) { 808 #ifndef PRODUCT 809 ResourceMark rm; 810 Log(itables) logi; 811 LogStream lsi(logi.trace()); 812 Log(vtables) logv; 813 LogStream lsv(logv.trace()); 814 outputStream* st; 815 if (logitables) { 816 st = &lsi; 817 } else { 818 st = &lsv; 819 } 820 st->print("%s%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ", 821 prefix, 822 (klass == NULL ? "<NULL>" : klass->internal_name()), 823 (resolved_klass == NULL ? "<NULL>" : resolved_klass->internal_name()), 824 Method::name_and_sig_as_C_string(resolved_klass, 825 method->name(), 826 method->signature()), 827 method->method_holder()->internal_name()); 828 method->print_linkage_flags(st); 829 if (index != -1) { 830 st->print("vtable_index:%d", index); 831 } 832 st->cr(); 833 #endif // PRODUCT 834 } 835 836 // Do linktime resolution of a method in the interface within the context of the specied bytecode. 837 methodHandle LinkResolver::resolve_interface_method(const LinkInfo& link_info, Bytecodes::Code code, TRAPS) { 838 839 Klass* resolved_klass = link_info.resolved_klass(); 840 841 // check if klass is interface 842 if (!resolved_klass->is_interface()) { 843 ResourceMark rm(THREAD); 844 char buf[200]; 845 jio_snprintf(buf, sizeof(buf), "Found class %s, but interface was expected", resolved_klass->external_name()); 846 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 847 } 848 849 // check constant pool tag for called method - must be JVM_CONSTANT_InterfaceMethodref 850 if (!link_info.tag().is_invalid() && !link_info.tag().is_interface_method()) { 851 ResourceMark rm(THREAD); 852 char buf[200]; 853 jio_snprintf(buf, sizeof(buf), "Method %s must be InterfaceMethodref constant", link_info.method_string()); 854 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 855 } 856 857 // lookup method in this interface or its super, java.lang.Object 858 // JDK8: also look for static methods 859 methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, false, true)); 860 861 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) { 862 // lookup method in all the super-interfaces 863 resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info)); 864 } 865 866 if (resolved_method.is_null()) { 867 // no method found 868 ResourceMark rm(THREAD); 869 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), 870 Method::name_and_sig_as_C_string(resolved_klass, 871 link_info.name(), 872 link_info.signature())); 873 } 874 875 if (link_info.check_access()) { 876 // JDK8 adds non-public interface methods, and accessability check requirement 877 Klass* current_klass = link_info.current_klass(); 878 879 assert(current_klass != NULL , "current_klass should not be null"); 880 881 // check if method can be accessed by the referring class 882 check_method_accessability(current_klass, 883 resolved_klass, 884 resolved_method->method_holder(), 885 resolved_method, 886 CHECK_NULL); 887 888 check_method_loader_constraints(link_info, resolved_method, "interface method", CHECK_NULL); 889 } 890 891 if (code != Bytecodes::_invokestatic && resolved_method->is_static()) { 892 ResourceMark rm(THREAD); 893 char buf[200]; 894 jio_snprintf(buf, sizeof(buf), "Expected instance not static method %s", 895 Method::name_and_sig_as_C_string(resolved_klass, 896 resolved_method->name(), resolved_method->signature())); 897 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 898 } 899 900 if (log_develop_is_enabled(Trace, itables)) { 901 char buf[200]; 902 jio_snprintf(buf, sizeof(buf), "%s resolved interface method: caller-class:", 903 Bytecodes::name(code)); 904 trace_method_resolution(buf, link_info.current_klass(), resolved_klass, 905 resolved_method, true); 906 } 907 908 return resolved_method; 909 } 910 911 //------------------------------------------------------------------------------------------------------------------------ 912 // Field resolution 913 914 void LinkResolver::check_field_accessability(Klass* ref_klass, 915 Klass* resolved_klass, 916 Klass* sel_klass, 917 const fieldDescriptor& fd, 918 TRAPS) { 919 if (!Reflection::verify_field_access(ref_klass, 920 resolved_klass, 921 sel_klass, 922 fd.access_flags(), 923 true)) { 924 // Propagate any existing exceptions that may have been thrown 925 if (HAS_PENDING_EXCEPTION) { 926 return; 927 } 928 929 ResourceMark rm(THREAD); 930 Exceptions::fthrow( 931 THREAD_AND_LOCATION, 932 vmSymbols::java_lang_IllegalAccessError(), 933 "tried to access field %s.%s from class %s", 934 sel_klass->external_name(), 935 fd.name()->as_C_string(), 936 ref_klass->external_name() 937 ); 938 return; 939 } 940 } 941 942 void LinkResolver::resolve_field_access(fieldDescriptor& fd, const constantPoolHandle& pool, int index, const methodHandle& method, Bytecodes::Code byte, TRAPS) { 943 LinkInfo link_info(pool, index, method, CHECK); 944 resolve_field(fd, link_info, byte, true, CHECK); 945 } 946 947 void LinkResolver::resolve_field(fieldDescriptor& fd, 948 const LinkInfo& link_info, 949 Bytecodes::Code byte, bool initialize_class, 950 TRAPS) { 951 assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic || 952 byte == Bytecodes::_getfield || byte == Bytecodes::_putfield || 953 byte == Bytecodes::_nofast_getfield || byte == Bytecodes::_nofast_putfield || 954 (byte == Bytecodes::_nop && !link_info.check_access()), "bad field access bytecode"); 955 956 bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic); 957 bool is_put = (byte == Bytecodes::_putfield || byte == Bytecodes::_putstatic || byte == Bytecodes::_nofast_putfield); 958 // Check if there's a resolved klass containing the field 959 Klass* resolved_klass = link_info.resolved_klass(); 960 Symbol* field = link_info.name(); 961 Symbol* sig = link_info.signature(); 962 963 if (resolved_klass == NULL) { 964 ResourceMark rm(THREAD); 965 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string()); 966 } 967 968 // Resolve instance field 969 Klass* sel_klass = resolved_klass->find_field(field, sig, &fd); 970 // check if field exists; i.e., if a klass containing the field def has been selected 971 if (sel_klass == NULL) { 972 ResourceMark rm(THREAD); 973 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string()); 974 } 975 976 if (!link_info.check_access()) 977 // Access checking may be turned off when calling from within the VM. 978 return; 979 980 // check access 981 Klass* current_klass = link_info.current_klass(); 982 check_field_accessability(current_klass, resolved_klass, sel_klass, fd, CHECK); 983 984 // check for errors 985 if (is_static != fd.is_static()) { 986 ResourceMark rm(THREAD); 987 char msg[200]; 988 jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string()); 989 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg); 990 } 991 992 // A final field can be modified only 993 // (1) by methods declared in the class declaring the field and 994 // (2) by the <clinit> method (in case of a static field) 995 // or by the <init> method (in case of an instance field). 996 if (is_put && fd.access_flags().is_final()) { 997 ResourceMark rm(THREAD); 998 stringStream ss; 999 1000 if (sel_klass != current_klass) { 1001 ss.print("Update to %s final field %s.%s attempted from a different class (%s) than the field's declaring class", 1002 is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(), 1003 current_klass->external_name()); 1004 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string()); 1005 } 1006 1007 if (fd.constants()->pool_holder()->major_version() >= 53) { 1008 methodHandle m = link_info.current_method(); 1009 assert(!m.is_null(), "information about the current method must be available for 'put' bytecodes"); 1010 bool is_initialized_static_final_update = (byte == Bytecodes::_putstatic && 1011 fd.is_static() && 1012 !m()->is_static_initializer()); 1013 bool is_initialized_instance_final_update = ((byte == Bytecodes::_putfield || byte == Bytecodes::_nofast_putfield) && 1014 !fd.is_static() && 1015 !m->is_object_initializer()); 1016 1017 if (is_initialized_static_final_update || is_initialized_instance_final_update) { 1018 ss.print("Update to %s final field %s.%s attempted from a different method (%s) than the initializer method %s ", 1019 is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(), 1020 m()->name()->as_C_string(), 1021 is_static ? "<clinit>" : "<init>"); 1022 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string()); 1023 } 1024 } 1025 } 1026 1027 // initialize resolved_klass if necessary 1028 // note 1: the klass which declared the field must be initialized (i.e, sel_klass) 1029 // according to the newest JVM spec (5.5, p.170) - was bug (gri 7/28/99) 1030 // 1031 // note 2: we don't want to force initialization if we are just checking 1032 // if the field access is legal; e.g., during compilation 1033 if (is_static && initialize_class) { 1034 sel_klass->initialize(CHECK); 1035 } 1036 1037 if (sel_klass != current_klass) { 1038 check_field_loader_constraints(field, sig, current_klass, sel_klass, CHECK); 1039 } 1040 1041 // return information. note that the klass is set to the actual klass containing the 1042 // field, otherwise access of static fields in superclasses will not work. 1043 } 1044 1045 1046 //------------------------------------------------------------------------------------------------------------------------ 1047 // Invoke resolution 1048 // 1049 // Naming conventions: 1050 // 1051 // resolved_method the specified method (i.e., static receiver specified via constant pool index) 1052 // sel_method the selected method (selected via run-time lookup; e.g., based on dynamic receiver class) 1053 // resolved_klass the specified klass (i.e., specified via constant pool index) 1054 // recv_klass the receiver klass 1055 1056 1057 void LinkResolver::resolve_static_call(CallInfo& result, 1058 const LinkInfo& link_info, 1059 bool initialize_class, TRAPS) { 1060 methodHandle resolved_method = linktime_resolve_static_method(link_info, CHECK); 1061 1062 // The resolved class can change as a result of this resolution. 1063 Klass* resolved_klass = resolved_method->method_holder(); 1064 1065 // Initialize klass (this should only happen if everything is ok) 1066 if (initialize_class && resolved_klass->should_be_initialized()) { 1067 resolved_klass->initialize(CHECK); 1068 // Use updated LinkInfo to reresolve with resolved method holder 1069 LinkInfo new_info(resolved_klass, link_info.name(), link_info.signature(), 1070 link_info.current_klass(), 1071 link_info.check_access() ? LinkInfo::needs_access_check : LinkInfo::skip_access_check); 1072 resolved_method = linktime_resolve_static_method(new_info, CHECK); 1073 } 1074 1075 // setup result 1076 result.set_static(resolved_klass, resolved_method, CHECK); 1077 } 1078 1079 // throws linktime exceptions 1080 methodHandle LinkResolver::linktime_resolve_static_method(const LinkInfo& link_info, TRAPS) { 1081 1082 Klass* resolved_klass = link_info.resolved_klass(); 1083 methodHandle resolved_method; 1084 if (!resolved_klass->is_interface()) { 1085 resolved_method = resolve_method(link_info, Bytecodes::_invokestatic, CHECK_NULL); 1086 } else { 1087 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokestatic, CHECK_NULL); 1088 } 1089 assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier"); 1090 1091 // check if static 1092 if (!resolved_method->is_static()) { 1093 ResourceMark rm(THREAD); 1094 char buf[200]; 1095 jio_snprintf(buf, sizeof(buf), "Expected static method %s", Method::name_and_sig_as_C_string(resolved_klass, 1096 resolved_method->name(), 1097 resolved_method->signature())); 1098 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1099 } 1100 return resolved_method; 1101 } 1102 1103 1104 void LinkResolver::resolve_special_call(CallInfo& result, 1105 Handle recv, 1106 const LinkInfo& link_info, 1107 TRAPS) { 1108 methodHandle resolved_method = linktime_resolve_special_method(link_info, CHECK); 1109 runtime_resolve_special_method(result, link_info, resolved_method, recv, CHECK); 1110 } 1111 1112 // throws linktime exceptions 1113 methodHandle LinkResolver::linktime_resolve_special_method(const LinkInfo& link_info, 1114 TRAPS) { 1115 1116 // Invokespecial is called for multiple special reasons: 1117 // <init> 1118 // local private method invocation, for classes and interfaces 1119 // superclass.method, which can also resolve to a default method 1120 // and the selected method is recalculated relative to the direct superclass 1121 // superinterface.method, which explicitly does not check shadowing 1122 Klass* resolved_klass = link_info.resolved_klass(); 1123 methodHandle resolved_method; 1124 1125 if (!resolved_klass->is_interface()) { 1126 resolved_method = resolve_method(link_info, Bytecodes::_invokespecial, CHECK_NULL); 1127 } else { 1128 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokespecial, CHECK_NULL); 1129 } 1130 1131 // check if method name is <init>, that it is found in same klass as static type 1132 if (resolved_method->name() == vmSymbols::object_initializer_name() && 1133 resolved_method->method_holder() != resolved_klass) { 1134 ResourceMark rm(THREAD); 1135 Exceptions::fthrow( 1136 THREAD_AND_LOCATION, 1137 vmSymbols::java_lang_NoSuchMethodError(), 1138 "%s: method %s%s not found", 1139 resolved_klass->external_name(), 1140 resolved_method->name()->as_C_string(), 1141 resolved_method->signature()->as_C_string() 1142 ); 1143 return NULL; 1144 } 1145 1146 // ensure that invokespecial's interface method reference is in 1147 // a direct superinterface, not an indirect superinterface 1148 Klass* current_klass = link_info.current_klass(); 1149 if (current_klass != NULL && resolved_klass->is_interface()) { 1150 InstanceKlass* ck = InstanceKlass::cast(current_klass); 1151 InstanceKlass *klass_to_check = !ck->is_anonymous() ? 1152 ck : 1153 InstanceKlass::cast(ck->host_klass()); 1154 // Disable verification for the dynamically-generated reflection bytecodes. 1155 bool is_reflect = klass_to_check->is_subclass_of( 1156 SystemDictionary::reflect_MagicAccessorImpl_klass()); 1157 1158 if (!is_reflect && 1159 !klass_to_check->is_same_or_direct_interface(resolved_klass)) { 1160 ResourceMark rm(THREAD); 1161 char buf[200]; 1162 jio_snprintf(buf, sizeof(buf), 1163 "Interface method reference: %s, is in an indirect superinterface of %s", 1164 Method::name_and_sig_as_C_string(resolved_klass, 1165 resolved_method->name(), 1166 resolved_method->signature()), 1167 current_klass->external_name()); 1168 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1169 } 1170 } 1171 1172 // check if not static 1173 if (resolved_method->is_static()) { 1174 ResourceMark rm(THREAD); 1175 char buf[200]; 1176 jio_snprintf(buf, sizeof(buf), 1177 "Expecting non-static method %s", 1178 Method::name_and_sig_as_C_string(resolved_klass, 1179 resolved_method->name(), 1180 resolved_method->signature())); 1181 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1182 } 1183 1184 if (log_develop_is_enabled(Trace, itables)) { 1185 trace_method_resolution("invokespecial resolved method: caller-class:", 1186 current_klass, resolved_klass, resolved_method, true); 1187 } 1188 1189 return resolved_method; 1190 } 1191 1192 // throws runtime exceptions 1193 void LinkResolver::runtime_resolve_special_method(CallInfo& result, 1194 const LinkInfo& link_info, 1195 const methodHandle& resolved_method, 1196 Handle recv, TRAPS) { 1197 1198 Klass* resolved_klass = link_info.resolved_klass(); 1199 1200 // resolved method is selected method unless we have an old-style lookup 1201 // for a superclass method 1202 // Invokespecial for a superinterface, resolved method is selected method, 1203 // no checks for shadowing 1204 methodHandle sel_method(THREAD, resolved_method()); 1205 1206 if (link_info.check_access() && 1207 // check if the method is not <init> 1208 resolved_method->name() != vmSymbols::object_initializer_name()) { 1209 1210 // check if this is an old-style super call and do a new lookup if so 1211 // a) check if ACC_SUPER flag is set for the current class 1212 Klass* current_klass = link_info.current_klass(); 1213 if ((current_klass->is_super() || !AllowNonVirtualCalls) && 1214 // b) check if the class of the resolved_klass is a superclass 1215 // (not supertype in order to exclude interface classes) of the current class. 1216 // This check is not performed for super.invoke for interface methods 1217 // in super interfaces. 1218 current_klass->is_subclass_of(resolved_klass) && 1219 current_klass != resolved_klass 1220 ) { 1221 // Lookup super method 1222 Klass* super_klass = current_klass->super(); 1223 sel_method = lookup_instance_method_in_klasses(super_klass, 1224 resolved_method->name(), 1225 resolved_method->signature(), 1226 Klass::find_private, CHECK); 1227 // check if found 1228 if (sel_method.is_null()) { 1229 ResourceMark rm(THREAD); 1230 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), 1231 Method::name_and_sig_as_C_string(resolved_klass, 1232 resolved_method->name(), 1233 resolved_method->signature())); 1234 // check loader constraints if found a different method 1235 } else if (sel_method() != resolved_method()) { 1236 check_method_loader_constraints(link_info, sel_method, "method", CHECK); 1237 } 1238 } 1239 1240 // Check that the class of objectref (the receiver) is the current class or interface, 1241 // or a subtype of the current class or interface (the sender), otherwise invokespecial 1242 // throws IllegalAccessError. 1243 // The verifier checks that the sender is a subtype of the class in the I/MR operand. 1244 // The verifier also checks that the receiver is a subtype of the sender, if the sender is 1245 // a class. If the sender is an interface, the check has to be performed at runtime. 1246 InstanceKlass* sender = InstanceKlass::cast(current_klass); 1247 sender = sender->is_anonymous() ? sender->host_klass() : sender; 1248 if (sender->is_interface() && recv.not_null()) { 1249 Klass* receiver_klass = recv->klass(); 1250 if (!receiver_klass->is_subtype_of(sender)) { 1251 ResourceMark rm(THREAD); 1252 char buf[500]; 1253 jio_snprintf(buf, sizeof(buf), 1254 "Receiver class %s must be the current class or a subtype of interface %s", 1255 receiver_klass->name()->as_C_string(), 1256 sender->name()->as_C_string()); 1257 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), buf); 1258 } 1259 } 1260 } 1261 1262 // check if not static 1263 if (sel_method->is_static()) { 1264 ResourceMark rm(THREAD); 1265 char buf[200]; 1266 jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass, 1267 resolved_method->name(), 1268 resolved_method->signature())); 1269 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1270 } 1271 1272 // check if abstract 1273 if (sel_method->is_abstract()) { 1274 ResourceMark rm(THREAD); 1275 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), 1276 Method::name_and_sig_as_C_string(resolved_klass, 1277 sel_method->name(), 1278 sel_method->signature())); 1279 } 1280 1281 if (log_develop_is_enabled(Trace, itables)) { 1282 trace_method_resolution("invokespecial selected method: resolved-class:", 1283 resolved_klass, resolved_klass, sel_method, true); 1284 } 1285 1286 // setup result 1287 result.set_static(resolved_klass, sel_method, CHECK); 1288 } 1289 1290 void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, Klass* receiver_klass, 1291 const LinkInfo& link_info, 1292 bool check_null_and_abstract, TRAPS) { 1293 methodHandle resolved_method = linktime_resolve_virtual_method(link_info, CHECK); 1294 runtime_resolve_virtual_method(result, resolved_method, 1295 link_info.resolved_klass(), 1296 recv, receiver_klass, 1297 check_null_and_abstract, CHECK); 1298 } 1299 1300 // throws linktime exceptions 1301 methodHandle LinkResolver::linktime_resolve_virtual_method(const LinkInfo& link_info, 1302 TRAPS) { 1303 // normal method resolution 1304 methodHandle resolved_method = resolve_method(link_info, Bytecodes::_invokevirtual, CHECK_NULL); 1305 1306 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier"); 1307 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier"); 1308 1309 // check if private interface method 1310 Klass* resolved_klass = link_info.resolved_klass(); 1311 Klass* current_klass = link_info.current_klass(); 1312 1313 // This is impossible, if resolve_klass is an interface, we've thrown icce in resolve_method 1314 if (resolved_klass->is_interface() && resolved_method->is_private()) { 1315 ResourceMark rm(THREAD); 1316 char buf[200]; 1317 jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokevirtual: method %s, caller-class:%s", 1318 Method::name_and_sig_as_C_string(resolved_klass, 1319 resolved_method->name(), 1320 resolved_method->signature()), 1321 (current_klass == NULL ? "<NULL>" : current_klass->internal_name())); 1322 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1323 } 1324 1325 // check if not static 1326 if (resolved_method->is_static()) { 1327 ResourceMark rm(THREAD); 1328 char buf[200]; 1329 jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass, 1330 resolved_method->name(), 1331 resolved_method->signature())); 1332 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1333 } 1334 1335 if (log_develop_is_enabled(Trace, vtables)) { 1336 trace_method_resolution("invokevirtual resolved method: caller-class:", 1337 current_klass, resolved_klass, resolved_method, false); 1338 } 1339 1340 return resolved_method; 1341 } 1342 1343 // throws runtime exceptions 1344 void LinkResolver::runtime_resolve_virtual_method(CallInfo& result, 1345 const methodHandle& resolved_method, 1346 Klass* resolved_klass, 1347 Handle recv, 1348 Klass* recv_klass, 1349 bool check_null_and_abstract, 1350 TRAPS) { 1351 1352 // setup default return values 1353 int vtable_index = Method::invalid_vtable_index; 1354 methodHandle selected_method; 1355 1356 // runtime method resolution 1357 if (check_null_and_abstract && recv.is_null()) { // check if receiver exists 1358 THROW(vmSymbols::java_lang_NullPointerException()); 1359 } 1360 1361 // Virtual methods cannot be resolved before its klass has been linked, for otherwise the Method*'s 1362 // has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since 1363 // a missing receiver might result in a bogus lookup. 1364 assert(resolved_method->method_holder()->is_linked(), "must be linked"); 1365 1366 // do lookup based on receiver klass using the vtable index 1367 if (resolved_method->method_holder()->is_interface()) { // default or miranda method 1368 vtable_index = vtable_index_of_interface_method(resolved_klass, resolved_method); 1369 assert(vtable_index >= 0 , "we should have valid vtable index at this point"); 1370 1371 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index)); 1372 } else { 1373 // at this point we are sure that resolved_method is virtual and not 1374 // a default or miranda method; therefore, it must have a valid vtable index. 1375 assert(!resolved_method->has_itable_index(), ""); 1376 vtable_index = resolved_method->vtable_index(); 1377 // We could get a negative vtable_index of nonvirtual_vtable_index for private 1378 // methods, or for final methods. Private methods never appear in the vtable 1379 // and never override other methods. As an optimization, final methods are 1380 // never put in the vtable, unless they override an existing method. 1381 // So if we do get nonvirtual_vtable_index, it means the selected method is the 1382 // resolved method, and it can never be changed by an override. 1383 if (vtable_index == Method::nonvirtual_vtable_index) { 1384 assert(resolved_method->can_be_statically_bound(), "cannot override this method"); 1385 selected_method = resolved_method; 1386 } else { 1387 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index)); 1388 } 1389 } 1390 1391 // check if method exists 1392 if (selected_method.is_null()) { 1393 throw_abstract_method_error(resolved_method, recv_klass, CHECK); 1394 } 1395 1396 // check if abstract 1397 if (check_null_and_abstract && selected_method->is_abstract()) { 1398 // Pass arguments for generating a verbose error message. 1399 throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK); 1400 } 1401 1402 if (log_develop_is_enabled(Trace, vtables)) { 1403 trace_method_resolution("invokevirtual selected method: receiver-class:", 1404 recv_klass, resolved_klass, selected_method, 1405 false, vtable_index); 1406 } 1407 // setup result 1408 result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK); 1409 } 1410 1411 void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, Klass* recv_klass, 1412 const LinkInfo& link_info, 1413 bool check_null_and_abstract, TRAPS) { 1414 // throws linktime exceptions 1415 methodHandle resolved_method = linktime_resolve_interface_method(link_info, CHECK); 1416 runtime_resolve_interface_method(result, resolved_method,link_info.resolved_klass(), 1417 recv, recv_klass, check_null_and_abstract, CHECK); 1418 } 1419 1420 methodHandle LinkResolver::linktime_resolve_interface_method(const LinkInfo& link_info, 1421 TRAPS) { 1422 // normal interface method resolution 1423 methodHandle resolved_method = resolve_interface_method(link_info, Bytecodes::_invokeinterface, CHECK_NULL); 1424 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier"); 1425 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier"); 1426 1427 return resolved_method; 1428 } 1429 1430 // throws runtime exceptions 1431 void LinkResolver::runtime_resolve_interface_method(CallInfo& result, 1432 const methodHandle& resolved_method, 1433 Klass* resolved_klass, 1434 Handle recv, 1435 Klass* recv_klass, 1436 bool check_null_and_abstract, TRAPS) { 1437 1438 // check if receiver exists 1439 if (check_null_and_abstract && recv.is_null()) { 1440 THROW(vmSymbols::java_lang_NullPointerException()); 1441 } 1442 1443 // check if receiver klass implements the resolved interface 1444 if (!recv_klass->is_subtype_of(resolved_klass)) { 1445 ResourceMark rm(THREAD); 1446 char buf[200]; 1447 jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s", 1448 recv_klass->external_name(), 1449 resolved_klass->external_name()); 1450 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1451 } 1452 1453 methodHandle selected_method = resolved_method; 1454 1455 // resolve the method in the receiver class, unless it is private 1456 if (!resolved_method()->is_private()) { 1457 // do lookup based on receiver klass 1458 // This search must match the linktime preparation search for itable initialization 1459 // to correctly enforce loader constraints for interface method inheritance. 1460 // Private methods are skipped as the resolved method was not private. 1461 selected_method = lookup_instance_method_in_klasses(recv_klass, 1462 resolved_method->name(), 1463 resolved_method->signature(), 1464 Klass::skip_private, CHECK); 1465 1466 if (selected_method.is_null() && !check_null_and_abstract) { 1467 // In theory this is a harmless placeholder value, but 1468 // in practice leaving in null affects the nsk default method tests. 1469 // This needs further study. 1470 selected_method = resolved_method; 1471 } 1472 // check if method exists 1473 if (selected_method.is_null()) { 1474 // Pass arguments for generating a verbose error message. 1475 throw_abstract_method_error(resolved_method, recv_klass, CHECK); 1476 } 1477 // check access 1478 // Throw Illegal Access Error if selected_method is not public. 1479 if (!selected_method->is_public()) { 1480 ResourceMark rm(THREAD); 1481 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), 1482 Method::name_and_sig_as_C_string(recv_klass, 1483 selected_method->name(), 1484 selected_method->signature())); 1485 } 1486 // check if abstract 1487 if (check_null_and_abstract && selected_method->is_abstract()) { 1488 throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK); 1489 } 1490 } 1491 1492 if (log_develop_is_enabled(Trace, itables)) { 1493 trace_method_resolution("invokeinterface selected method: receiver-class:", 1494 recv_klass, resolved_klass, selected_method, true); 1495 } 1496 // setup result 1497 if (resolved_method->has_vtable_index()) { 1498 int vtable_index = resolved_method->vtable_index(); 1499 log_develop_trace(itables)(" -- vtable index: %d", vtable_index); 1500 assert(vtable_index == selected_method->vtable_index(), "sanity check"); 1501 result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK); 1502 } else if (resolved_method->has_itable_index()) { 1503 int itable_index = resolved_method()->itable_index(); 1504 log_develop_trace(itables)(" -- itable index: %d", itable_index); 1505 result.set_interface(resolved_klass, recv_klass, resolved_method, selected_method, itable_index, CHECK); 1506 } else { 1507 int index = resolved_method->vtable_index(); 1508 log_develop_trace(itables)(" -- non itable/vtable index: %d", index); 1509 assert(index == Method::nonvirtual_vtable_index, "Oops hit another case!"); 1510 assert(resolved_method()->is_private() || 1511 (resolved_method()->is_final() && resolved_method->method_holder() == SystemDictionary::Object_klass()), 1512 "Should only have non-virtual invokeinterface for private or final-Object methods!"); 1513 assert(resolved_method()->can_be_statically_bound(), "Should only have non-virtual invokeinterface for statically bound methods!"); 1514 // This sets up the nonvirtual form of "virtual" call (as needed for final and private methods) 1515 result.set_virtual(resolved_klass, resolved_klass, resolved_method, resolved_method, index, CHECK); 1516 } 1517 } 1518 1519 1520 methodHandle LinkResolver::linktime_resolve_interface_method_or_null( 1521 const LinkInfo& link_info) { 1522 EXCEPTION_MARK; 1523 methodHandle method_result = linktime_resolve_interface_method(link_info, THREAD); 1524 if (HAS_PENDING_EXCEPTION) { 1525 CLEAR_PENDING_EXCEPTION; 1526 return methodHandle(); 1527 } else { 1528 return method_result; 1529 } 1530 } 1531 1532 methodHandle LinkResolver::linktime_resolve_virtual_method_or_null( 1533 const LinkInfo& link_info) { 1534 EXCEPTION_MARK; 1535 methodHandle method_result = linktime_resolve_virtual_method(link_info, THREAD); 1536 if (HAS_PENDING_EXCEPTION) { 1537 CLEAR_PENDING_EXCEPTION; 1538 return methodHandle(); 1539 } else { 1540 return method_result; 1541 } 1542 } 1543 1544 methodHandle LinkResolver::resolve_virtual_call_or_null( 1545 Klass* receiver_klass, 1546 const LinkInfo& link_info) { 1547 EXCEPTION_MARK; 1548 CallInfo info; 1549 resolve_virtual_call(info, Handle(), receiver_klass, link_info, false, THREAD); 1550 if (HAS_PENDING_EXCEPTION) { 1551 CLEAR_PENDING_EXCEPTION; 1552 return methodHandle(); 1553 } 1554 return info.selected_method(); 1555 } 1556 1557 methodHandle LinkResolver::resolve_interface_call_or_null( 1558 Klass* receiver_klass, 1559 const LinkInfo& link_info) { 1560 EXCEPTION_MARK; 1561 CallInfo info; 1562 resolve_interface_call(info, Handle(), receiver_klass, link_info, false, THREAD); 1563 if (HAS_PENDING_EXCEPTION) { 1564 CLEAR_PENDING_EXCEPTION; 1565 return methodHandle(); 1566 } 1567 return info.selected_method(); 1568 } 1569 1570 int LinkResolver::resolve_virtual_vtable_index(Klass* receiver_klass, 1571 const LinkInfo& link_info) { 1572 EXCEPTION_MARK; 1573 CallInfo info; 1574 resolve_virtual_call(info, Handle(), receiver_klass, link_info, 1575 /*check_null_or_abstract*/false, THREAD); 1576 if (HAS_PENDING_EXCEPTION) { 1577 CLEAR_PENDING_EXCEPTION; 1578 return Method::invalid_vtable_index; 1579 } 1580 return info.vtable_index(); 1581 } 1582 1583 methodHandle LinkResolver::resolve_static_call_or_null(const LinkInfo& link_info) { 1584 EXCEPTION_MARK; 1585 CallInfo info; 1586 resolve_static_call(info, link_info, /*initialize_class*/false, THREAD); 1587 if (HAS_PENDING_EXCEPTION) { 1588 CLEAR_PENDING_EXCEPTION; 1589 return methodHandle(); 1590 } 1591 return info.selected_method(); 1592 } 1593 1594 methodHandle LinkResolver::resolve_special_call_or_null(const LinkInfo& link_info) { 1595 EXCEPTION_MARK; 1596 CallInfo info; 1597 resolve_special_call(info, Handle(), link_info, THREAD); 1598 if (HAS_PENDING_EXCEPTION) { 1599 CLEAR_PENDING_EXCEPTION; 1600 return methodHandle(); 1601 } 1602 return info.selected_method(); 1603 } 1604 1605 1606 1607 //------------------------------------------------------------------------------------------------------------------------ 1608 // ConstantPool entries 1609 1610 void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) { 1611 switch (byte) { 1612 case Bytecodes::_invokestatic : resolve_invokestatic (result, pool, index, CHECK); break; 1613 case Bytecodes::_invokespecial : resolve_invokespecial (result, recv, pool, index, CHECK); break; 1614 case Bytecodes::_invokevirtual : resolve_invokevirtual (result, recv, pool, index, CHECK); break; 1615 case Bytecodes::_invokehandle : resolve_invokehandle (result, pool, index, CHECK); break; 1616 case Bytecodes::_invokedynamic : resolve_invokedynamic (result, pool, index, CHECK); break; 1617 case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break; 1618 default : break; 1619 } 1620 return; 1621 } 1622 1623 void LinkResolver::resolve_invoke(CallInfo& result, Handle& recv, 1624 const methodHandle& attached_method, 1625 Bytecodes::Code byte, TRAPS) { 1626 Klass* defc = attached_method->method_holder(); 1627 Symbol* name = attached_method->name(); 1628 Symbol* type = attached_method->signature(); 1629 LinkInfo link_info(defc, name, type); 1630 switch(byte) { 1631 case Bytecodes::_invokevirtual: 1632 resolve_virtual_call(result, recv, recv->klass(), link_info, 1633 /*check_null_and_abstract=*/true, CHECK); 1634 break; 1635 case Bytecodes::_invokeinterface: 1636 resolve_interface_call(result, recv, recv->klass(), link_info, 1637 /*check_null_and_abstract=*/true, CHECK); 1638 break; 1639 case Bytecodes::_invokestatic: 1640 resolve_static_call(result, link_info, /*initialize_class=*/false, CHECK); 1641 break; 1642 case Bytecodes::_invokespecial: 1643 resolve_special_call(result, recv, link_info, CHECK); 1644 break; 1645 default: 1646 fatal("bad call: %s", Bytecodes::name(byte)); 1647 break; 1648 } 1649 } 1650 1651 void LinkResolver::resolve_invokestatic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) { 1652 LinkInfo link_info(pool, index, CHECK); 1653 resolve_static_call(result, link_info, /*initialize_class*/true, CHECK); 1654 } 1655 1656 1657 void LinkResolver::resolve_invokespecial(CallInfo& result, Handle recv, 1658 const constantPoolHandle& pool, int index, TRAPS) { 1659 LinkInfo link_info(pool, index, CHECK); 1660 resolve_special_call(result, recv, link_info, CHECK); 1661 } 1662 1663 1664 void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv, 1665 const constantPoolHandle& pool, int index, 1666 TRAPS) { 1667 1668 LinkInfo link_info(pool, index, CHECK); 1669 Klass* recvrKlass = recv.is_null() ? (Klass*)NULL : recv->klass(); 1670 resolve_virtual_call(result, recv, recvrKlass, link_info, /*check_null_or_abstract*/true, CHECK); 1671 } 1672 1673 1674 void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, TRAPS) { 1675 LinkInfo link_info(pool, index, CHECK); 1676 Klass* recvrKlass = recv.is_null() ? (Klass*)NULL : recv->klass(); 1677 resolve_interface_call(result, recv, recvrKlass, link_info, true, CHECK); 1678 } 1679 1680 1681 void LinkResolver::resolve_invokehandle(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) { 1682 // This guy is reached from InterpreterRuntime::resolve_invokehandle. 1683 LinkInfo link_info(pool, index, CHECK); 1684 if (TraceMethodHandles) { 1685 ResourceMark rm(THREAD); 1686 tty->print_cr("resolve_invokehandle %s %s", link_info.name()->as_C_string(), 1687 link_info.signature()->as_C_string()); 1688 } 1689 resolve_handle_call(result, link_info, CHECK); 1690 } 1691 1692 void LinkResolver::resolve_handle_call(CallInfo& result, 1693 const LinkInfo& link_info, 1694 TRAPS) { 1695 // JSR 292: this must be an implicitly generated method MethodHandle.invokeExact(*...) or similar 1696 Klass* resolved_klass = link_info.resolved_klass(); 1697 assert(resolved_klass == SystemDictionary::MethodHandle_klass() || 1698 resolved_klass == SystemDictionary::VarHandle_klass(), ""); 1699 assert(MethodHandles::is_signature_polymorphic_name(link_info.name()), ""); 1700 Handle resolved_appendix; 1701 Handle resolved_method_type; 1702 methodHandle resolved_method = lookup_polymorphic_method(link_info, 1703 &resolved_appendix, &resolved_method_type, CHECK); 1704 result.set_handle(resolved_klass, resolved_method, resolved_appendix, resolved_method_type, CHECK); 1705 } 1706 1707 void LinkResolver::resolve_invokedynamic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) { 1708 Symbol* method_name = pool->name_ref_at(index); 1709 Symbol* method_signature = pool->signature_ref_at(index); 1710 Klass* current_klass = pool->pool_holder(); 1711 1712 // Resolve the bootstrap specifier (BSM + optional arguments). 1713 Handle bootstrap_specifier; 1714 // Check if CallSite has been bound already: 1715 ConstantPoolCacheEntry* cpce = pool->invokedynamic_cp_cache_entry_at(index); 1716 int pool_index = cpce->constant_pool_index(); 1717 1718 if (cpce->is_f1_null()) { 1719 if (cpce->indy_resolution_failed()) { 1720 ConstantPool::throw_resolution_error(pool, 1721 ResolutionErrorTable::encode_cpcache_index(index), 1722 CHECK); 1723 } 1724 1725 // The initial step in Call Site Specifier Resolution is to resolve the symbolic 1726 // reference to a method handle which will be the bootstrap method for a dynamic 1727 // call site. If resolution for the java.lang.invoke.MethodHandle for the bootstrap 1728 // method fails, then a MethodHandleInError is stored at the corresponding bootstrap 1729 // method's CP index for the CONSTANT_MethodHandle_info. So, there is no need to 1730 // set the indy_rf flag since any subsequent invokedynamic instruction which shares 1731 // this bootstrap method will encounter the resolution of MethodHandleInError. 1732 oop bsm_info = pool->resolve_bootstrap_specifier_at(pool_index, THREAD); 1733 Exceptions::wrap_dynamic_exception(CHECK); 1734 assert(bsm_info != NULL, ""); 1735 // FIXME: Cache this once per BootstrapMethods entry, not once per CONSTANT_InvokeDynamic. 1736 bootstrap_specifier = Handle(THREAD, bsm_info); 1737 } 1738 if (!cpce->is_f1_null()) { 1739 methodHandle method( THREAD, cpce->f1_as_method()); 1740 Handle appendix( THREAD, cpce->appendix_if_resolved(pool)); 1741 Handle method_type(THREAD, cpce->method_type_if_resolved(pool)); 1742 result.set_handle(method, appendix, method_type, THREAD); 1743 Exceptions::wrap_dynamic_exception(CHECK); 1744 return; 1745 } 1746 1747 if (TraceMethodHandles) { 1748 ResourceMark rm(THREAD); 1749 tty->print_cr("resolve_invokedynamic #%d %s %s in %s", 1750 ConstantPool::decode_invokedynamic_index(index), 1751 method_name->as_C_string(), method_signature->as_C_string(), 1752 current_klass->name()->as_C_string()); 1753 tty->print(" BSM info: "); bootstrap_specifier->print(); 1754 } 1755 1756 resolve_dynamic_call(result, pool_index, bootstrap_specifier, method_name, 1757 method_signature, current_klass, THREAD); 1758 if (HAS_PENDING_EXCEPTION && PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { 1759 int encoded_index = ResolutionErrorTable::encode_cpcache_index(index); 1760 bool recorded_res_status = cpce->save_and_throw_indy_exc(pool, pool_index, 1761 encoded_index, 1762 pool()->tag_at(pool_index), 1763 CHECK); 1764 if (!recorded_res_status) { 1765 // Another thread got here just before we did. So, either use the method 1766 // that it resolved or throw the LinkageError exception that it threw. 1767 if (!cpce->is_f1_null()) { 1768 methodHandle method( THREAD, cpce->f1_as_method()); 1769 Handle appendix( THREAD, cpce->appendix_if_resolved(pool)); 1770 Handle method_type(THREAD, cpce->method_type_if_resolved(pool)); 1771 result.set_handle(method, appendix, method_type, THREAD); 1772 Exceptions::wrap_dynamic_exception(CHECK); 1773 } else { 1774 assert(cpce->indy_resolution_failed(), "Resolution failure flag not set"); 1775 ConstantPool::throw_resolution_error(pool, encoded_index, CHECK); 1776 } 1777 return; 1778 } 1779 assert(cpce->indy_resolution_failed(), "Resolution failure flag wasn't set"); 1780 } 1781 } 1782 1783 void LinkResolver::resolve_dynamic_call(CallInfo& result, 1784 int pool_index, 1785 Handle bootstrap_specifier, 1786 Symbol* method_name, Symbol* method_signature, 1787 Klass* current_klass, 1788 TRAPS) { 1789 // JSR 292: this must resolve to an implicitly generated method MH.linkToCallSite(*...) 1790 // The appendix argument is likely to be a freshly-created CallSite. 1791 Handle resolved_appendix; 1792 Handle resolved_method_type; 1793 methodHandle resolved_method = 1794 SystemDictionary::find_dynamic_call_site_invoker(current_klass, 1795 pool_index, 1796 bootstrap_specifier, 1797 method_name, method_signature, 1798 &resolved_appendix, 1799 &resolved_method_type, 1800 THREAD); 1801 Exceptions::wrap_dynamic_exception(CHECK); 1802 result.set_handle(resolved_method, resolved_appendix, resolved_method_type, THREAD); 1803 Exceptions::wrap_dynamic_exception(CHECK); 1804 } 1805 1806 // Selected method is abstract. 1807 void LinkResolver::throw_abstract_method_error(const methodHandle& resolved_method, 1808 const methodHandle& selected_method, 1809 Klass *recv_klass, TRAPS) { 1810 Klass *resolved_klass = resolved_method->method_holder(); 1811 ResourceMark rm(THREAD); 1812 stringStream ss; 1813 1814 if (recv_klass != NULL) { 1815 ss.print("Receiver class %s does not define or inherit an " 1816 "implementation of the", 1817 recv_klass->external_name()); 1818 } else { 1819 ss.print("Missing implementation of"); 1820 } 1821 1822 assert(resolved_method.not_null(), "Sanity"); 1823 ss.print(" resolved method %s%s%s%s of %s %s.", 1824 resolved_method->is_abstract() ? "abstract " : "", 1825 resolved_method->is_private() ? "private " : "", 1826 resolved_method->name()->as_C_string(), 1827 resolved_method->signature()->as_C_string(), 1828 resolved_klass->external_kind(), 1829 resolved_klass->external_name()); 1830 1831 if (selected_method.not_null() && !(resolved_method == selected_method)) { 1832 ss.print(" Selected method is %s%s%s.", 1833 selected_method->is_abstract() ? "abstract " : "", 1834 selected_method->is_private() ? "private " : "", 1835 selected_method->name_and_sig_as_C_string()); 1836 } 1837 1838 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string()); 1839 }