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, TRAPS) { 391 Method* result = klass->uncached_lookup_method(name, signature, Klass::find_overpass); 392 393 while (result != NULL && result->is_static() && result->method_holder()->super() != NULL) { 394 Klass* super_klass = result->method_holder()->super(); 395 result = super_klass->uncached_lookup_method(name, signature, Klass::find_overpass); 396 } 397 398 if (klass->is_array_klass()) { 399 // Only consider klass and super klass for arrays 400 return methodHandle(THREAD, result); 401 } 402 403 if (result == NULL) { 404 Array<Method*>* default_methods = InstanceKlass::cast(klass)->default_methods(); 405 if (default_methods != NULL) { 406 result = InstanceKlass::find_method(default_methods, name, signature); 407 assert(result == NULL || !result->is_static(), "static defaults not allowed"); 408 } 409 } 410 return methodHandle(THREAD, result); 411 } 412 413 int LinkResolver::vtable_index_of_interface_method(Klass* klass, 414 const methodHandle& resolved_method) { 415 416 int vtable_index = Method::invalid_vtable_index; 417 Symbol* name = resolved_method->name(); 418 Symbol* signature = resolved_method->signature(); 419 InstanceKlass* ik = InstanceKlass::cast(klass); 420 421 // First check in default method array 422 if (!resolved_method->is_abstract() && ik->default_methods() != NULL) { 423 int index = InstanceKlass::find_method_index(ik->default_methods(), 424 name, signature, Klass::find_overpass, 425 Klass::find_static, Klass::find_private); 426 if (index >= 0 ) { 427 vtable_index = ik->default_vtable_indices()->at(index); 428 } 429 } 430 if (vtable_index == Method::invalid_vtable_index) { 431 // get vtable_index for miranda methods 432 klassVtable vt = ik->vtable(); 433 vtable_index = vt.index_of_miranda(name, signature); 434 } 435 return vtable_index; 436 } 437 438 Method* LinkResolver::lookup_method_in_interfaces(const LinkInfo& cp_info) { 439 InstanceKlass *ik = InstanceKlass::cast(cp_info.resolved_klass()); 440 441 // Specify 'true' in order to skip default methods when searching the 442 // interfaces. Function lookup_method_in_klasses() already looked for 443 // the method in the default methods table. 444 return ik->lookup_method_in_all_interfaces(cp_info.name(), cp_info.signature(), Klass::skip_defaults); 445 } 446 447 methodHandle LinkResolver::lookup_polymorphic_method( 448 const LinkInfo& link_info, 449 Handle *appendix_result_or_null, 450 Handle *method_type_result, 451 TRAPS) { 452 Klass* klass = link_info.resolved_klass(); 453 Symbol* name = link_info.name(); 454 Symbol* full_signature = link_info.signature(); 455 456 vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name); 457 if (TraceMethodHandles) { 458 ResourceMark rm(THREAD); 459 tty->print_cr("lookup_polymorphic_method iid=%s %s.%s%s", 460 vmIntrinsics::name_at(iid), klass->external_name(), 461 name->as_C_string(), full_signature->as_C_string()); 462 } 463 if ((klass == SystemDictionary::MethodHandle_klass() || 464 klass == SystemDictionary::VarHandle_klass()) && 465 iid != vmIntrinsics::_none) { 466 if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) { 467 // Most of these do not need an up-call to Java to resolve, so can be done anywhere. 468 // Do not erase last argument type (MemberName) if it is a static linkTo method. 469 bool keep_last_arg = MethodHandles::is_signature_polymorphic_static(iid); 470 TempNewSymbol basic_signature = 471 MethodHandles::lookup_basic_type_signature(full_signature, keep_last_arg, CHECK_NULL); 472 if (TraceMethodHandles) { 473 ResourceMark rm(THREAD); 474 tty->print_cr("lookup_polymorphic_method %s %s => basic %s", 475 name->as_C_string(), 476 full_signature->as_C_string(), 477 basic_signature->as_C_string()); 478 } 479 methodHandle result = SystemDictionary::find_method_handle_intrinsic(iid, 480 basic_signature, 481 CHECK_NULL); 482 if (result.not_null()) { 483 assert(result->is_method_handle_intrinsic(), "MH.invokeBasic or MH.linkTo* intrinsic"); 484 assert(result->intrinsic_id() != vmIntrinsics::_invokeGeneric, "wrong place to find this"); 485 assert(basic_signature == result->signature(), "predict the result signature"); 486 if (TraceMethodHandles) { 487 ttyLocker ttyl; 488 tty->print("lookup_polymorphic_method => intrinsic "); 489 result->print_on(tty); 490 } 491 } 492 return result; 493 } else if (iid == vmIntrinsics::_invokeGeneric 494 && THREAD->can_call_java() 495 && appendix_result_or_null != NULL) { 496 // This is a method with type-checking semantics. 497 // We will ask Java code to spin an adapter method for it. 498 if (!MethodHandles::enabled()) { 499 // Make sure the Java part of the runtime has been booted up. 500 Klass* natives = SystemDictionary::MethodHandleNatives_klass(); 501 if (natives == NULL || InstanceKlass::cast(natives)->is_not_initialized()) { 502 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_invoke_MethodHandleNatives(), 503 Handle(), 504 Handle(), 505 true, 506 CHECK_NULL); 507 } 508 } 509 510 Handle appendix; 511 Handle method_type; 512 methodHandle result = SystemDictionary::find_method_handle_invoker( 513 klass, 514 name, 515 full_signature, 516 link_info.current_klass(), 517 &appendix, 518 &method_type, 519 CHECK_NULL); 520 if (TraceMethodHandles) { 521 ttyLocker ttyl; 522 tty->print("lookup_polymorphic_method => (via Java) "); 523 result->print_on(tty); 524 tty->print(" lookup_polymorphic_method => appendix = "); 525 if (appendix.is_null()) tty->print_cr("(none)"); 526 else appendix->print_on(tty); 527 } 528 if (result.not_null()) { 529 #ifdef ASSERT 530 ResourceMark rm(THREAD); 531 532 TempNewSymbol basic_signature = 533 MethodHandles::lookup_basic_type_signature(full_signature, CHECK_NULL); 534 int actual_size_of_params = result->size_of_parameters(); 535 int expected_size_of_params = ArgumentSizeComputer(basic_signature).size(); 536 // +1 for MethodHandle.this, +1 for trailing MethodType 537 if (!MethodHandles::is_signature_polymorphic_static(iid)) expected_size_of_params += 1; 538 if (appendix.not_null()) expected_size_of_params += 1; 539 if (actual_size_of_params != expected_size_of_params) { 540 tty->print_cr("*** basic_signature=%s", basic_signature->as_C_string()); 541 tty->print_cr("*** result for %s: ", vmIntrinsics::name_at(iid)); 542 result->print(); 543 } 544 assert(actual_size_of_params == expected_size_of_params, 545 "%d != %d", actual_size_of_params, expected_size_of_params); 546 #endif //ASSERT 547 548 assert(appendix_result_or_null != NULL, ""); 549 (*appendix_result_or_null) = appendix; 550 (*method_type_result) = method_type; 551 } 552 return result; 553 } 554 } 555 return NULL; 556 } 557 558 void LinkResolver::check_method_accessability(Klass* ref_klass, 559 Klass* resolved_klass, 560 Klass* sel_klass, 561 const methodHandle& sel_method, 562 TRAPS) { 563 564 AccessFlags flags = sel_method->access_flags(); 565 566 // Special case: arrays always override "clone". JVMS 2.15. 567 // If the resolved klass is an array class, and the declaring class 568 // is java.lang.Object and the method is "clone", set the flags 569 // to public. 570 // 571 // We'll check for the method name first, as that's most likely 572 // to be false (so we'll short-circuit out of these tests). 573 if (sel_method->name() == vmSymbols::clone_name() && 574 sel_klass == SystemDictionary::Object_klass() && 575 resolved_klass->is_array_klass()) { 576 // We need to change "protected" to "public". 577 assert(flags.is_protected(), "clone not protected?"); 578 jint new_flags = flags.as_int(); 579 new_flags = new_flags & (~JVM_ACC_PROTECTED); 580 new_flags = new_flags | JVM_ACC_PUBLIC; 581 flags.set_flags(new_flags); 582 } 583 // assert(extra_arg_result_or_null != NULL, "must be able to return extra argument"); 584 585 if (!Reflection::verify_field_access(ref_klass, 586 resolved_klass, 587 sel_klass, 588 flags, 589 true)) { 590 ResourceMark rm(THREAD); 591 Exceptions::fthrow( 592 THREAD_AND_LOCATION, 593 vmSymbols::java_lang_IllegalAccessError(), 594 "tried to access method %s.%s%s from class %s", 595 sel_klass->external_name(), 596 sel_method->name()->as_C_string(), 597 sel_method->signature()->as_C_string(), 598 ref_klass->external_name() 599 ); 600 return; 601 } 602 } 603 604 methodHandle LinkResolver::resolve_method_statically(Bytecodes::Code code, 605 const constantPoolHandle& pool, int index, TRAPS) { 606 // This method is used only 607 // (1) in C2 from InlineTree::ok_to_inline (via ciMethod::check_call), 608 // and 609 // (2) in Bytecode_invoke::static_target 610 // It appears to fail when applied to an invokeinterface call site. 611 // FIXME: Remove this method and ciMethod::check_call; refactor to use the other LinkResolver entry points. 612 // resolve klass 613 if (code == Bytecodes::_invokedynamic) { 614 Klass* resolved_klass = SystemDictionary::MethodHandle_klass(); 615 Symbol* method_name = vmSymbols::invoke_name(); 616 Symbol* method_signature = pool->signature_ref_at(index); 617 Klass* current_klass = pool->pool_holder(); 618 LinkInfo link_info(resolved_klass, method_name, method_signature, current_klass); 619 return resolve_method(link_info, code, THREAD); 620 } 621 622 LinkInfo link_info(pool, index, methodHandle(), CHECK_NULL); 623 Klass* resolved_klass = link_info.resolved_klass(); 624 625 if (pool->has_preresolution() 626 || (resolved_klass == SystemDictionary::MethodHandle_klass() && 627 MethodHandles::is_signature_polymorphic_name(resolved_klass, link_info.name()))) { 628 Method* result = ConstantPool::method_at_if_loaded(pool, index); 629 if (result != NULL) { 630 return methodHandle(THREAD, result); 631 } 632 } 633 634 if (code == Bytecodes::_invokeinterface) { 635 return resolve_interface_method(link_info, code, THREAD); 636 } else if (code == Bytecodes::_invokevirtual) { 637 return resolve_method(link_info, code, THREAD); 638 } else if (!resolved_klass->is_interface()) { 639 return resolve_method(link_info, code, THREAD); 640 } else { 641 return resolve_interface_method(link_info, code, THREAD); 642 } 643 } 644 645 // Check and print a loader constraint violation message for method or interface method 646 void LinkResolver::check_method_loader_constraints(const LinkInfo& link_info, 647 const methodHandle& resolved_method, 648 const char* method_type, TRAPS) { 649 Handle current_loader(THREAD, link_info.current_klass()->class_loader()); 650 Handle resolved_loader(THREAD, resolved_method->method_holder()->class_loader()); 651 652 ResourceMark rm(THREAD); 653 Symbol* failed_type_symbol = 654 SystemDictionary::check_signature_loaders(link_info.signature(), current_loader, 655 resolved_loader, true, CHECK); 656 if (failed_type_symbol != NULL) { 657 const char* msg = "loader constraint violation: when resolving %s" 658 " \"%s\" the class loader (instance of %s) of the current class, %s," 659 " and the class loader (instance of %s) for the method's defining class, %s, have" 660 " different Class objects for the type %s used in the signature"; 661 char* sig = link_info.method_string(); 662 const char* loader1_name = SystemDictionary::loader_name(current_loader()); 663 char* current = link_info.current_klass()->name()->as_C_string(); 664 const char* loader2_name = SystemDictionary::loader_name(resolved_loader()); 665 char* target = resolved_method->method_holder()->name()->as_C_string(); 666 char* failed_type_name = failed_type_symbol->as_C_string(); 667 size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1_name) + 668 strlen(current) + strlen(loader2_name) + strlen(target) + 669 strlen(failed_type_name) + strlen(method_type) + 1; 670 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); 671 jio_snprintf(buf, buflen, msg, method_type, sig, loader1_name, current, loader2_name, 672 target, failed_type_name); 673 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); 674 } 675 } 676 677 void LinkResolver::check_field_loader_constraints(Symbol* field, Symbol* sig, 678 Klass* current_klass, 679 Klass* sel_klass, TRAPS) { 680 Handle ref_loader(THREAD, current_klass->class_loader()); 681 Handle sel_loader(THREAD, sel_klass->class_loader()); 682 683 ResourceMark rm(THREAD); // needed for check_signature_loaders 684 Symbol* failed_type_symbol = 685 SystemDictionary::check_signature_loaders(sig, 686 ref_loader, sel_loader, 687 false, 688 CHECK); 689 if (failed_type_symbol != NULL) { 690 const char* msg = "loader constraint violation: when resolving field" 691 " \"%s\" the class loader (instance of %s) of the referring class, " 692 "%s, and the class loader (instance of %s) for the field's resolved " 693 "type, %s, have different Class objects for that type"; 694 char* field_name = field->as_C_string(); 695 const char* loader1_name = SystemDictionary::loader_name(ref_loader()); 696 char* sel = sel_klass->name()->as_C_string(); 697 const char* loader2_name = SystemDictionary::loader_name(sel_loader()); 698 char* failed_type_name = failed_type_symbol->as_C_string(); 699 size_t buflen = strlen(msg) + strlen(field_name) + strlen(loader1_name) + 700 strlen(sel) + strlen(loader2_name) + strlen(failed_type_name) + 1; 701 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); 702 jio_snprintf(buf, buflen, msg, field_name, loader1_name, sel, loader2_name, 703 failed_type_name); 704 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); 705 } 706 } 707 708 methodHandle LinkResolver::resolve_method(const LinkInfo& link_info, 709 Bytecodes::Code code, TRAPS) { 710 711 Handle nested_exception; 712 Klass* resolved_klass = link_info.resolved_klass(); 713 714 // 1. For invokevirtual, cannot call an interface method 715 if (code == Bytecodes::_invokevirtual && resolved_klass->is_interface()) { 716 ResourceMark rm(THREAD); 717 char buf[200]; 718 jio_snprintf(buf, sizeof(buf), "Found interface %s, but class was expected", 719 resolved_klass->external_name()); 720 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 721 } 722 723 // 2. check constant pool tag for called method - must be JVM_CONSTANT_Methodref 724 if (!link_info.tag().is_invalid() && !link_info.tag().is_method()) { 725 ResourceMark rm(THREAD); 726 char buf[200]; 727 jio_snprintf(buf, sizeof(buf), "Method %s must be Methodref constant", link_info.method_string()); 728 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 729 } 730 731 // 3. lookup method in resolved klass and its super klasses 732 methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, true, false)); 733 734 // 4. lookup method in all the interfaces implemented by the resolved klass 735 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) { // not found in the class hierarchy 736 resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info)); 737 738 if (resolved_method.is_null()) { 739 // JSR 292: see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc 740 resolved_method = lookup_polymorphic_method(link_info, (Handle*)NULL, (Handle*)NULL, THREAD); 741 if (HAS_PENDING_EXCEPTION) { 742 nested_exception = Handle(THREAD, PENDING_EXCEPTION); 743 CLEAR_PENDING_EXCEPTION; 744 } 745 } 746 } 747 748 // 5. method lookup failed 749 if (resolved_method.is_null()) { 750 ResourceMark rm(THREAD); 751 THROW_MSG_CAUSE_(vmSymbols::java_lang_NoSuchMethodError(), 752 Method::name_and_sig_as_C_string(resolved_klass, 753 link_info.name(), 754 link_info.signature()), 755 nested_exception, NULL); 756 } 757 758 // 5. access checks, access checking may be turned off when calling from within the VM. 759 Klass* current_klass = link_info.current_klass(); 760 if (link_info.check_access()) { 761 assert(current_klass != NULL , "current_klass should not be null"); 762 763 // check if method can be accessed by the referring class 764 check_method_accessability(current_klass, 765 resolved_klass, 766 resolved_method->method_holder(), 767 resolved_method, 768 CHECK_NULL); 769 770 // check loader constraints 771 check_method_loader_constraints(link_info, resolved_method, "method", CHECK_NULL); 772 } 773 774 return resolved_method; 775 } 776 777 static void trace_method_resolution(const char* prefix, 778 Klass* klass, 779 Klass* resolved_klass, 780 const methodHandle& method, 781 bool logitables, 782 int index = -1) { 783 #ifndef PRODUCT 784 ResourceMark rm; 785 Log(itables) logi; 786 LogStream lsi(logi.trace()); 787 Log(vtables) logv; 788 LogStream lsv(logv.trace()); 789 outputStream* st; 790 if (logitables) { 791 st = &lsi; 792 } else { 793 st = &lsv; 794 } 795 st->print("%s%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ", 796 prefix, 797 (klass == NULL ? "<NULL>" : klass->internal_name()), 798 (resolved_klass == NULL ? "<NULL>" : resolved_klass->internal_name()), 799 Method::name_and_sig_as_C_string(resolved_klass, 800 method->name(), 801 method->signature()), 802 method->method_holder()->internal_name()); 803 method->print_linkage_flags(st); 804 if (index != -1) { 805 st->print("vtable_index:%d", index); 806 } 807 st->cr(); 808 #endif // PRODUCT 809 } 810 811 // Do linktime resolution of a method in the interface within the context of the specied bytecode. 812 methodHandle LinkResolver::resolve_interface_method(const LinkInfo& link_info, Bytecodes::Code code, TRAPS) { 813 814 Klass* resolved_klass = link_info.resolved_klass(); 815 816 // check if klass is interface 817 if (!resolved_klass->is_interface()) { 818 ResourceMark rm(THREAD); 819 char buf[200]; 820 jio_snprintf(buf, sizeof(buf), "Found class %s, but interface was expected", resolved_klass->external_name()); 821 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 822 } 823 824 // check constant pool tag for called method - must be JVM_CONSTANT_InterfaceMethodref 825 if (!link_info.tag().is_invalid() && !link_info.tag().is_interface_method()) { 826 ResourceMark rm(THREAD); 827 char buf[200]; 828 jio_snprintf(buf, sizeof(buf), "Method %s must be InterfaceMethodref constant", link_info.method_string()); 829 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 830 } 831 832 // lookup method in this interface or its super, java.lang.Object 833 // JDK8: also look for static methods 834 methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, false, true)); 835 836 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) { 837 // lookup method in all the super-interfaces 838 resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info)); 839 } 840 841 if (resolved_method.is_null()) { 842 // no method found 843 ResourceMark rm(THREAD); 844 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), 845 Method::name_and_sig_as_C_string(resolved_klass, 846 link_info.name(), 847 link_info.signature())); 848 } 849 850 if (link_info.check_access()) { 851 // JDK8 adds non-public interface methods, and accessability check requirement 852 Klass* current_klass = link_info.current_klass(); 853 854 assert(current_klass != NULL , "current_klass should not be null"); 855 856 // check if method can be accessed by the referring class 857 check_method_accessability(current_klass, 858 resolved_klass, 859 resolved_method->method_holder(), 860 resolved_method, 861 CHECK_NULL); 862 863 check_method_loader_constraints(link_info, resolved_method, "interface method", CHECK_NULL); 864 } 865 866 if (code != Bytecodes::_invokestatic && resolved_method->is_static()) { 867 ResourceMark rm(THREAD); 868 char buf[200]; 869 jio_snprintf(buf, sizeof(buf), "Expected instance not static method %s", 870 Method::name_and_sig_as_C_string(resolved_klass, 871 resolved_method->name(), resolved_method->signature())); 872 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 873 } 874 875 if (code == Bytecodes::_invokeinterface && resolved_method->is_private()) { 876 ResourceMark rm(THREAD); 877 char buf[200]; 878 879 Klass* current_klass = link_info.current_klass(); 880 jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokeinterface: method %s, caller-class:%s", 881 Method::name_and_sig_as_C_string(resolved_klass, 882 resolved_method->name(), 883 resolved_method->signature()), 884 (current_klass == NULL ? "<NULL>" : current_klass->internal_name())); 885 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 886 } 887 888 if (log_develop_is_enabled(Trace, itables)) { 889 char buf[200]; 890 jio_snprintf(buf, sizeof(buf), "%s resolved interface method: caller-class:", 891 Bytecodes::name(code)); 892 trace_method_resolution(buf, link_info.current_klass(), resolved_klass, 893 resolved_method, true); 894 } 895 896 return resolved_method; 897 } 898 899 //------------------------------------------------------------------------------------------------------------------------ 900 // Field resolution 901 902 void LinkResolver::check_field_accessability(Klass* ref_klass, 903 Klass* resolved_klass, 904 Klass* sel_klass, 905 const fieldDescriptor& fd, 906 TRAPS) { 907 if (!Reflection::verify_field_access(ref_klass, 908 resolved_klass, 909 sel_klass, 910 fd.access_flags(), 911 true)) { 912 ResourceMark rm(THREAD); 913 Exceptions::fthrow( 914 THREAD_AND_LOCATION, 915 vmSymbols::java_lang_IllegalAccessError(), 916 "tried to access field %s.%s from class %s", 917 sel_klass->external_name(), 918 fd.name()->as_C_string(), 919 ref_klass->external_name() 920 ); 921 return; 922 } 923 } 924 925 void LinkResolver::resolve_field_access(fieldDescriptor& fd, const constantPoolHandle& pool, int index, const methodHandle& method, Bytecodes::Code byte, TRAPS) { 926 LinkInfo link_info(pool, index, method, CHECK); 927 resolve_field(fd, link_info, byte, true, CHECK); 928 } 929 930 void LinkResolver::resolve_field(fieldDescriptor& fd, 931 const LinkInfo& link_info, 932 Bytecodes::Code byte, bool initialize_class, 933 TRAPS) { 934 assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic || 935 byte == Bytecodes::_getfield || byte == Bytecodes::_putfield || 936 byte == Bytecodes::_nofast_getfield || byte == Bytecodes::_nofast_putfield || 937 (byte == Bytecodes::_nop && !link_info.check_access()), "bad field access bytecode"); 938 939 bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic); 940 bool is_put = (byte == Bytecodes::_putfield || byte == Bytecodes::_putstatic || byte == Bytecodes::_nofast_putfield); 941 // Check if there's a resolved klass containing the field 942 Klass* resolved_klass = link_info.resolved_klass(); 943 Symbol* field = link_info.name(); 944 Symbol* sig = link_info.signature(); 945 946 if (resolved_klass == NULL) { 947 ResourceMark rm(THREAD); 948 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string()); 949 } 950 951 // Resolve instance field 952 Klass* sel_klass = resolved_klass->find_field(field, sig, &fd); 953 // check if field exists; i.e., if a klass containing the field def has been selected 954 if (sel_klass == NULL) { 955 ResourceMark rm(THREAD); 956 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string()); 957 } 958 959 if (!link_info.check_access()) 960 // Access checking may be turned off when calling from within the VM. 961 return; 962 963 // check access 964 Klass* current_klass = link_info.current_klass(); 965 check_field_accessability(current_klass, resolved_klass, sel_klass, fd, CHECK); 966 967 // check for errors 968 if (is_static != fd.is_static()) { 969 ResourceMark rm(THREAD); 970 char msg[200]; 971 jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string()); 972 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg); 973 } 974 975 // A final field can be modified only 976 // (1) by methods declared in the class declaring the field and 977 // (2) by the <clinit> method (in case of a static field) 978 // or by the <init> method (in case of an instance field). 979 if (is_put && fd.access_flags().is_final()) { 980 ResourceMark rm(THREAD); 981 stringStream ss; 982 983 if (sel_klass != current_klass) { 984 ss.print("Update to %s final field %s.%s attempted from a different class (%s) than the field's declaring class", 985 is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(), 986 current_klass->external_name()); 987 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string()); 988 } 989 990 if (fd.constants()->pool_holder()->major_version() >= 53) { 991 methodHandle m = link_info.current_method(); 992 assert(!m.is_null(), "information about the current method must be available for 'put' bytecodes"); 993 bool is_initialized_static_final_update = (byte == Bytecodes::_putstatic && 994 fd.is_static() && 995 !m()->is_static_initializer()); 996 bool is_initialized_instance_final_update = ((byte == Bytecodes::_putfield || byte == Bytecodes::_nofast_putfield) && 997 !fd.is_static() && 998 !m->is_object_initializer()); 999 1000 if (is_initialized_static_final_update || is_initialized_instance_final_update) { 1001 ss.print("Update to %s final field %s.%s attempted from a different method (%s) than the initializer method %s ", 1002 is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(), 1003 m()->name()->as_C_string(), 1004 is_static ? "<clinit>" : "<init>"); 1005 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string()); 1006 } 1007 } 1008 } 1009 1010 // initialize resolved_klass if necessary 1011 // note 1: the klass which declared the field must be initialized (i.e, sel_klass) 1012 // according to the newest JVM spec (5.5, p.170) - was bug (gri 7/28/99) 1013 // 1014 // note 2: we don't want to force initialization if we are just checking 1015 // if the field access is legal; e.g., during compilation 1016 if (is_static && initialize_class) { 1017 sel_klass->initialize(CHECK); 1018 } 1019 1020 if (sel_klass != current_klass) { 1021 check_field_loader_constraints(field, sig, current_klass, sel_klass, CHECK); 1022 } 1023 1024 // return information. note that the klass is set to the actual klass containing the 1025 // field, otherwise access of static fields in superclasses will not work. 1026 } 1027 1028 1029 //------------------------------------------------------------------------------------------------------------------------ 1030 // Invoke resolution 1031 // 1032 // Naming conventions: 1033 // 1034 // resolved_method the specified method (i.e., static receiver specified via constant pool index) 1035 // sel_method the selected method (selected via run-time lookup; e.g., based on dynamic receiver class) 1036 // resolved_klass the specified klass (i.e., specified via constant pool index) 1037 // recv_klass the receiver klass 1038 1039 1040 void LinkResolver::resolve_static_call(CallInfo& result, 1041 const LinkInfo& link_info, 1042 bool initialize_class, TRAPS) { 1043 methodHandle resolved_method = linktime_resolve_static_method(link_info, CHECK); 1044 1045 // The resolved class can change as a result of this resolution. 1046 Klass* resolved_klass = resolved_method->method_holder(); 1047 1048 // Initialize klass (this should only happen if everything is ok) 1049 if (initialize_class && resolved_klass->should_be_initialized()) { 1050 resolved_klass->initialize(CHECK); 1051 // Use updated LinkInfo to reresolve with resolved method holder 1052 LinkInfo new_info(resolved_klass, link_info.name(), link_info.signature(), 1053 link_info.current_klass(), 1054 link_info.check_access() ? LinkInfo::needs_access_check : LinkInfo::skip_access_check); 1055 resolved_method = linktime_resolve_static_method(new_info, CHECK); 1056 } 1057 1058 // setup result 1059 result.set_static(resolved_klass, resolved_method, CHECK); 1060 } 1061 1062 // throws linktime exceptions 1063 methodHandle LinkResolver::linktime_resolve_static_method(const LinkInfo& link_info, TRAPS) { 1064 1065 Klass* resolved_klass = link_info.resolved_klass(); 1066 methodHandle resolved_method; 1067 if (!resolved_klass->is_interface()) { 1068 resolved_method = resolve_method(link_info, Bytecodes::_invokestatic, CHECK_NULL); 1069 } else { 1070 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokestatic, CHECK_NULL); 1071 } 1072 assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier"); 1073 1074 // check if static 1075 if (!resolved_method->is_static()) { 1076 ResourceMark rm(THREAD); 1077 char buf[200]; 1078 jio_snprintf(buf, sizeof(buf), "Expected static method %s", Method::name_and_sig_as_C_string(resolved_klass, 1079 resolved_method->name(), 1080 resolved_method->signature())); 1081 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1082 } 1083 return resolved_method; 1084 } 1085 1086 1087 void LinkResolver::resolve_special_call(CallInfo& result, 1088 Handle recv, 1089 const LinkInfo& link_info, 1090 TRAPS) { 1091 methodHandle resolved_method = linktime_resolve_special_method(link_info, CHECK); 1092 runtime_resolve_special_method(result, link_info, resolved_method, recv, CHECK); 1093 } 1094 1095 // throws linktime exceptions 1096 methodHandle LinkResolver::linktime_resolve_special_method(const LinkInfo& link_info, 1097 TRAPS) { 1098 1099 // Invokespecial is called for multiple special reasons: 1100 // <init> 1101 // local private method invocation, for classes and interfaces 1102 // superclass.method, which can also resolve to a default method 1103 // and the selected method is recalculated relative to the direct superclass 1104 // superinterface.method, which explicitly does not check shadowing 1105 Klass* resolved_klass = link_info.resolved_klass(); 1106 methodHandle resolved_method; 1107 1108 if (!resolved_klass->is_interface()) { 1109 resolved_method = resolve_method(link_info, Bytecodes::_invokespecial, CHECK_NULL); 1110 } else { 1111 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokespecial, CHECK_NULL); 1112 } 1113 1114 // check if method name is <init>, that it is found in same klass as static type 1115 if (resolved_method->name() == vmSymbols::object_initializer_name() && 1116 resolved_method->method_holder() != resolved_klass) { 1117 ResourceMark rm(THREAD); 1118 Exceptions::fthrow( 1119 THREAD_AND_LOCATION, 1120 vmSymbols::java_lang_NoSuchMethodError(), 1121 "%s: method %s%s not found", 1122 resolved_klass->external_name(), 1123 resolved_method->name()->as_C_string(), 1124 resolved_method->signature()->as_C_string() 1125 ); 1126 return NULL; 1127 } 1128 1129 // check if invokespecial's interface method reference is in an indirect superinterface 1130 Klass* current_klass = link_info.current_klass(); 1131 if (current_klass != NULL && resolved_klass->is_interface()) { 1132 InstanceKlass* ck = InstanceKlass::cast(current_klass); 1133 InstanceKlass *klass_to_check = !ck->is_anonymous() ? 1134 ck : 1135 InstanceKlass::cast(ck->host_klass()); 1136 // Disable verification for the dynamically-generated reflection bytecodes. 1137 bool is_reflect = klass_to_check->is_subclass_of( 1138 SystemDictionary::reflect_MagicAccessorImpl_klass()); 1139 1140 if (!is_reflect && 1141 !klass_to_check->is_same_or_direct_interface(resolved_klass)) { 1142 ResourceMark rm(THREAD); 1143 char buf[200]; 1144 jio_snprintf(buf, sizeof(buf), 1145 "Interface method reference: %s, is in an indirect superinterface of %s", 1146 Method::name_and_sig_as_C_string(resolved_klass, 1147 resolved_method->name(), 1148 resolved_method->signature()), 1149 current_klass->external_name()); 1150 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1151 } 1152 } 1153 1154 // check if not static 1155 if (resolved_method->is_static()) { 1156 ResourceMark rm(THREAD); 1157 char buf[200]; 1158 jio_snprintf(buf, sizeof(buf), 1159 "Expecting non-static method %s", 1160 Method::name_and_sig_as_C_string(resolved_klass, 1161 resolved_method->name(), 1162 resolved_method->signature())); 1163 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1164 } 1165 1166 if (log_develop_is_enabled(Trace, itables)) { 1167 trace_method_resolution("invokespecial resolved method: caller-class:", 1168 current_klass, resolved_klass, resolved_method, true); 1169 } 1170 1171 return resolved_method; 1172 } 1173 1174 // throws runtime exceptions 1175 void LinkResolver::runtime_resolve_special_method(CallInfo& result, 1176 const LinkInfo& link_info, 1177 const methodHandle& resolved_method, 1178 Handle recv, TRAPS) { 1179 1180 Klass* resolved_klass = link_info.resolved_klass(); 1181 1182 // resolved method is selected method unless we have an old-style lookup 1183 // for a superclass method 1184 // Invokespecial for a superinterface, resolved method is selected method, 1185 // no checks for shadowing 1186 methodHandle sel_method(THREAD, resolved_method()); 1187 1188 if (link_info.check_access() && 1189 // check if the method is not <init> 1190 resolved_method->name() != vmSymbols::object_initializer_name()) { 1191 1192 // check if this is an old-style super call and do a new lookup if so 1193 // a) check if ACC_SUPER flag is set for the current class 1194 Klass* current_klass = link_info.current_klass(); 1195 if ((current_klass->is_super() || !AllowNonVirtualCalls) && 1196 // b) check if the class of the resolved_klass is a superclass 1197 // (not supertype in order to exclude interface classes) of the current class. 1198 // This check is not performed for super.invoke for interface methods 1199 // in super interfaces. 1200 current_klass->is_subclass_of(resolved_klass) && 1201 current_klass != resolved_klass) { 1202 // Lookup super method 1203 Klass* super_klass = current_klass->super(); 1204 sel_method = lookup_instance_method_in_klasses(super_klass, 1205 resolved_method->name(), 1206 resolved_method->signature(), CHECK); 1207 // check if found 1208 if (sel_method.is_null()) { 1209 ResourceMark rm(THREAD); 1210 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), 1211 Method::name_and_sig_as_C_string(resolved_klass, 1212 resolved_method->name(), 1213 resolved_method->signature())); 1214 // check loader constraints if found a different method 1215 } else if (sel_method() != resolved_method()) { 1216 check_method_loader_constraints(link_info, sel_method, "method", CHECK); 1217 } 1218 } 1219 1220 // Check that the class of objectref (the receiver) is the current class or interface, 1221 // or a subtype of the current class or interface (the sender), otherwise invokespecial 1222 // throws IllegalAccessError. 1223 // The verifier checks that the sender is a subtype of the class in the I/MR operand. 1224 // The verifier also checks that the receiver is a subtype of the sender, if the sender is 1225 // a class. If the sender is an interface, the check has to be performed at runtime. 1226 InstanceKlass* sender = InstanceKlass::cast(current_klass); 1227 sender = sender->is_anonymous() ? sender->host_klass() : sender; 1228 if (sender->is_interface() && recv.not_null()) { 1229 Klass* receiver_klass = recv->klass(); 1230 if (!receiver_klass->is_subtype_of(sender)) { 1231 ResourceMark rm(THREAD); 1232 char buf[500]; 1233 jio_snprintf(buf, sizeof(buf), 1234 "Receiver class %s must be the current class or a subtype of interface %s", 1235 receiver_klass->name()->as_C_string(), 1236 sender->name()->as_C_string()); 1237 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), buf); 1238 } 1239 } 1240 } 1241 1242 // check if not static 1243 if (sel_method->is_static()) { 1244 ResourceMark rm(THREAD); 1245 char buf[200]; 1246 jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass, 1247 resolved_method->name(), 1248 resolved_method->signature())); 1249 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1250 } 1251 1252 // check if abstract 1253 if (sel_method->is_abstract()) { 1254 ResourceMark rm(THREAD); 1255 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), 1256 Method::name_and_sig_as_C_string(resolved_klass, 1257 sel_method->name(), 1258 sel_method->signature())); 1259 } 1260 1261 if (log_develop_is_enabled(Trace, itables)) { 1262 trace_method_resolution("invokespecial selected method: resolved-class:", 1263 resolved_klass, resolved_klass, sel_method, true); 1264 } 1265 1266 // setup result 1267 result.set_static(resolved_klass, sel_method, CHECK); 1268 } 1269 1270 void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, Klass* receiver_klass, 1271 const LinkInfo& link_info, 1272 bool check_null_and_abstract, TRAPS) { 1273 methodHandle resolved_method = linktime_resolve_virtual_method(link_info, CHECK); 1274 runtime_resolve_virtual_method(result, resolved_method, 1275 link_info.resolved_klass(), 1276 recv, receiver_klass, 1277 check_null_and_abstract, CHECK); 1278 } 1279 1280 // throws linktime exceptions 1281 methodHandle LinkResolver::linktime_resolve_virtual_method(const LinkInfo& link_info, 1282 TRAPS) { 1283 // normal method resolution 1284 methodHandle resolved_method = resolve_method(link_info, Bytecodes::_invokevirtual, CHECK_NULL); 1285 1286 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier"); 1287 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier"); 1288 1289 // check if private interface method 1290 Klass* resolved_klass = link_info.resolved_klass(); 1291 Klass* current_klass = link_info.current_klass(); 1292 1293 // This is impossible, if resolve_klass is an interface, we've thrown icce in resolve_method 1294 if (resolved_klass->is_interface() && resolved_method->is_private()) { 1295 ResourceMark rm(THREAD); 1296 char buf[200]; 1297 jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokevirtual: method %s, caller-class:%s", 1298 Method::name_and_sig_as_C_string(resolved_klass, 1299 resolved_method->name(), 1300 resolved_method->signature()), 1301 (current_klass == NULL ? "<NULL>" : current_klass->internal_name())); 1302 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1303 } 1304 1305 // check if not static 1306 if (resolved_method->is_static()) { 1307 ResourceMark rm(THREAD); 1308 char buf[200]; 1309 jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass, 1310 resolved_method->name(), 1311 resolved_method->signature())); 1312 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1313 } 1314 1315 if (log_develop_is_enabled(Trace, vtables)) { 1316 trace_method_resolution("invokevirtual resolved method: caller-class:", 1317 current_klass, resolved_klass, resolved_method, false); 1318 } 1319 1320 return resolved_method; 1321 } 1322 1323 // throws runtime exceptions 1324 void LinkResolver::runtime_resolve_virtual_method(CallInfo& result, 1325 const methodHandle& resolved_method, 1326 Klass* resolved_klass, 1327 Handle recv, 1328 Klass* recv_klass, 1329 bool check_null_and_abstract, 1330 TRAPS) { 1331 1332 // setup default return values 1333 int vtable_index = Method::invalid_vtable_index; 1334 methodHandle selected_method; 1335 1336 // runtime method resolution 1337 if (check_null_and_abstract && recv.is_null()) { // check if receiver exists 1338 THROW(vmSymbols::java_lang_NullPointerException()); 1339 } 1340 1341 // Virtual methods cannot be resolved before its klass has been linked, for otherwise the Method*'s 1342 // has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since 1343 // a missing receiver might result in a bogus lookup. 1344 assert(resolved_method->method_holder()->is_linked(), "must be linked"); 1345 1346 // do lookup based on receiver klass using the vtable index 1347 if (resolved_method->method_holder()->is_interface()) { // default or miranda method 1348 vtable_index = vtable_index_of_interface_method(resolved_klass, resolved_method); 1349 assert(vtable_index >= 0 , "we should have valid vtable index at this point"); 1350 1351 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index)); 1352 } else { 1353 // at this point we are sure that resolved_method is virtual and not 1354 // a default or miranda method; therefore, it must have a valid vtable index. 1355 assert(!resolved_method->has_itable_index(), ""); 1356 vtable_index = resolved_method->vtable_index(); 1357 // We could get a negative vtable_index for final methods, 1358 // because as an optimization they are never put in the vtable, 1359 // unless they override an existing method. 1360 // If we do get a negative, it means the resolved method is the the selected 1361 // method, and it can never be changed by an override. 1362 if (vtable_index == Method::nonvirtual_vtable_index) { 1363 assert(resolved_method->can_be_statically_bound(), "cannot override this method"); 1364 selected_method = resolved_method; 1365 } else { 1366 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index)); 1367 } 1368 } 1369 1370 // check if method exists 1371 if (selected_method.is_null()) { 1372 throw_abstract_method_error(resolved_method, recv_klass, CHECK); 1373 } 1374 1375 // check if abstract 1376 if (check_null_and_abstract && selected_method->is_abstract()) { 1377 // Pass arguments for generating a verbose error message. 1378 throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK); 1379 } 1380 1381 if (log_develop_is_enabled(Trace, vtables)) { 1382 trace_method_resolution("invokevirtual selected method: receiver-class:", 1383 recv_klass, resolved_klass, selected_method, 1384 false, vtable_index); 1385 } 1386 // setup result 1387 result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK); 1388 } 1389 1390 void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, Klass* recv_klass, 1391 const LinkInfo& link_info, 1392 bool check_null_and_abstract, TRAPS) { 1393 // throws linktime exceptions 1394 methodHandle resolved_method = linktime_resolve_interface_method(link_info, CHECK); 1395 runtime_resolve_interface_method(result, resolved_method,link_info.resolved_klass(), 1396 recv, recv_klass, check_null_and_abstract, CHECK); 1397 } 1398 1399 methodHandle LinkResolver::linktime_resolve_interface_method(const LinkInfo& link_info, 1400 TRAPS) { 1401 // normal interface method resolution 1402 methodHandle resolved_method = resolve_interface_method(link_info, Bytecodes::_invokeinterface, CHECK_NULL); 1403 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier"); 1404 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier"); 1405 1406 return resolved_method; 1407 } 1408 1409 // throws runtime exceptions 1410 void LinkResolver::runtime_resolve_interface_method(CallInfo& result, 1411 const methodHandle& resolved_method, 1412 Klass* resolved_klass, 1413 Handle recv, 1414 Klass* recv_klass, 1415 bool check_null_and_abstract, TRAPS) { 1416 // check if receiver exists 1417 if (check_null_and_abstract && recv.is_null()) { 1418 THROW(vmSymbols::java_lang_NullPointerException()); 1419 } 1420 1421 // check if receiver klass implements the resolved interface 1422 if (!recv_klass->is_subtype_of(resolved_klass)) { 1423 ResourceMark rm(THREAD); 1424 char buf[200]; 1425 jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s", 1426 recv_klass->external_name(), 1427 resolved_klass->external_name()); 1428 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1429 } 1430 1431 // do lookup based on receiver klass 1432 // This search must match the linktime preparation search for itable initialization 1433 // to correctly enforce loader constraints for interface method inheritance 1434 methodHandle selected_method = lookup_instance_method_in_klasses(recv_klass, 1435 resolved_method->name(), 1436 resolved_method->signature(), CHECK); 1437 if (selected_method.is_null() && !check_null_and_abstract) { 1438 // In theory this is a harmless placeholder value, but 1439 // in practice leaving in null affects the nsk default method tests. 1440 // This needs further study. 1441 selected_method = resolved_method; 1442 } 1443 // check if method exists 1444 if (selected_method.is_null()) { 1445 // Pass arguments for generating a verbose error message. 1446 throw_abstract_method_error(resolved_method, recv_klass, CHECK); 1447 } 1448 // check access 1449 // Throw Illegal Access Error if selected_method is not public. 1450 if (!selected_method->is_public()) { 1451 ResourceMark rm(THREAD); 1452 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), 1453 Method::name_and_sig_as_C_string(recv_klass, 1454 selected_method->name(), 1455 selected_method->signature())); 1456 } 1457 // check if abstract 1458 if (check_null_and_abstract && selected_method->is_abstract()) { 1459 throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK); 1460 } 1461 1462 if (log_develop_is_enabled(Trace, itables)) { 1463 trace_method_resolution("invokeinterface selected method: receiver-class:", 1464 recv_klass, resolved_klass, selected_method, true); 1465 } 1466 // setup result 1467 if (!resolved_method->has_itable_index()) { 1468 int vtable_index = resolved_method->vtable_index(); 1469 assert(vtable_index == selected_method->vtable_index(), "sanity check"); 1470 result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK); 1471 } else { 1472 int itable_index = resolved_method()->itable_index(); 1473 result.set_interface(resolved_klass, recv_klass, resolved_method, selected_method, itable_index, CHECK); 1474 } 1475 } 1476 1477 1478 methodHandle LinkResolver::linktime_resolve_interface_method_or_null( 1479 const LinkInfo& link_info) { 1480 EXCEPTION_MARK; 1481 methodHandle method_result = linktime_resolve_interface_method(link_info, THREAD); 1482 if (HAS_PENDING_EXCEPTION) { 1483 CLEAR_PENDING_EXCEPTION; 1484 return methodHandle(); 1485 } else { 1486 return method_result; 1487 } 1488 } 1489 1490 methodHandle LinkResolver::linktime_resolve_virtual_method_or_null( 1491 const LinkInfo& link_info) { 1492 EXCEPTION_MARK; 1493 methodHandle method_result = linktime_resolve_virtual_method(link_info, THREAD); 1494 if (HAS_PENDING_EXCEPTION) { 1495 CLEAR_PENDING_EXCEPTION; 1496 return methodHandle(); 1497 } else { 1498 return method_result; 1499 } 1500 } 1501 1502 methodHandle LinkResolver::resolve_virtual_call_or_null( 1503 Klass* receiver_klass, 1504 const LinkInfo& link_info) { 1505 EXCEPTION_MARK; 1506 CallInfo info; 1507 resolve_virtual_call(info, Handle(), receiver_klass, link_info, false, THREAD); 1508 if (HAS_PENDING_EXCEPTION) { 1509 CLEAR_PENDING_EXCEPTION; 1510 return methodHandle(); 1511 } 1512 return info.selected_method(); 1513 } 1514 1515 methodHandle LinkResolver::resolve_interface_call_or_null( 1516 Klass* receiver_klass, 1517 const LinkInfo& link_info) { 1518 EXCEPTION_MARK; 1519 CallInfo info; 1520 resolve_interface_call(info, Handle(), receiver_klass, link_info, false, THREAD); 1521 if (HAS_PENDING_EXCEPTION) { 1522 CLEAR_PENDING_EXCEPTION; 1523 return methodHandle(); 1524 } 1525 return info.selected_method(); 1526 } 1527 1528 int LinkResolver::resolve_virtual_vtable_index(Klass* receiver_klass, 1529 const LinkInfo& link_info) { 1530 EXCEPTION_MARK; 1531 CallInfo info; 1532 resolve_virtual_call(info, Handle(), receiver_klass, link_info, 1533 /*check_null_or_abstract*/false, THREAD); 1534 if (HAS_PENDING_EXCEPTION) { 1535 CLEAR_PENDING_EXCEPTION; 1536 return Method::invalid_vtable_index; 1537 } 1538 return info.vtable_index(); 1539 } 1540 1541 methodHandle LinkResolver::resolve_static_call_or_null(const LinkInfo& link_info) { 1542 EXCEPTION_MARK; 1543 CallInfo info; 1544 resolve_static_call(info, link_info, /*initialize_class*/false, THREAD); 1545 if (HAS_PENDING_EXCEPTION) { 1546 CLEAR_PENDING_EXCEPTION; 1547 return methodHandle(); 1548 } 1549 return info.selected_method(); 1550 } 1551 1552 methodHandle LinkResolver::resolve_special_call_or_null(const LinkInfo& link_info) { 1553 EXCEPTION_MARK; 1554 CallInfo info; 1555 resolve_special_call(info, Handle(), link_info, THREAD); 1556 if (HAS_PENDING_EXCEPTION) { 1557 CLEAR_PENDING_EXCEPTION; 1558 return methodHandle(); 1559 } 1560 return info.selected_method(); 1561 } 1562 1563 1564 1565 //------------------------------------------------------------------------------------------------------------------------ 1566 // ConstantPool entries 1567 1568 void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) { 1569 switch (byte) { 1570 case Bytecodes::_invokestatic : resolve_invokestatic (result, pool, index, CHECK); break; 1571 case Bytecodes::_invokespecial : resolve_invokespecial (result, recv, pool, index, CHECK); break; 1572 case Bytecodes::_invokevirtual : resolve_invokevirtual (result, recv, pool, index, CHECK); break; 1573 case Bytecodes::_invokehandle : resolve_invokehandle (result, pool, index, CHECK); break; 1574 case Bytecodes::_invokedynamic : resolve_invokedynamic (result, pool, index, CHECK); break; 1575 case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break; 1576 default : break; 1577 } 1578 return; 1579 } 1580 1581 void LinkResolver::resolve_invoke(CallInfo& result, Handle& recv, 1582 const methodHandle& attached_method, 1583 Bytecodes::Code byte, TRAPS) { 1584 Klass* defc = attached_method->method_holder(); 1585 Symbol* name = attached_method->name(); 1586 Symbol* type = attached_method->signature(); 1587 LinkInfo link_info(defc, name, type); 1588 switch(byte) { 1589 case Bytecodes::_invokevirtual: 1590 resolve_virtual_call(result, recv, recv->klass(), link_info, 1591 /*check_null_and_abstract=*/true, CHECK); 1592 break; 1593 case Bytecodes::_invokeinterface: 1594 resolve_interface_call(result, recv, recv->klass(), link_info, 1595 /*check_null_and_abstract=*/true, CHECK); 1596 break; 1597 case Bytecodes::_invokestatic: 1598 resolve_static_call(result, link_info, /*initialize_class=*/false, CHECK); 1599 break; 1600 case Bytecodes::_invokespecial: 1601 resolve_special_call(result, recv, link_info, CHECK); 1602 break; 1603 default: 1604 fatal("bad call: %s", Bytecodes::name(byte)); 1605 break; 1606 } 1607 } 1608 1609 void LinkResolver::resolve_invokestatic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) { 1610 LinkInfo link_info(pool, index, CHECK); 1611 resolve_static_call(result, link_info, /*initialize_class*/true, CHECK); 1612 } 1613 1614 1615 void LinkResolver::resolve_invokespecial(CallInfo& result, Handle recv, 1616 const constantPoolHandle& pool, int index, TRAPS) { 1617 LinkInfo link_info(pool, index, CHECK); 1618 resolve_special_call(result, recv, link_info, CHECK); 1619 } 1620 1621 1622 void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv, 1623 const constantPoolHandle& pool, int index, 1624 TRAPS) { 1625 1626 LinkInfo link_info(pool, index, CHECK); 1627 Klass* recvrKlass = recv.is_null() ? (Klass*)NULL : recv->klass(); 1628 resolve_virtual_call(result, recv, recvrKlass, link_info, /*check_null_or_abstract*/true, CHECK); 1629 } 1630 1631 1632 void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, TRAPS) { 1633 LinkInfo link_info(pool, index, CHECK); 1634 Klass* recvrKlass = recv.is_null() ? (Klass*)NULL : recv->klass(); 1635 resolve_interface_call(result, recv, recvrKlass, link_info, true, CHECK); 1636 } 1637 1638 1639 void LinkResolver::resolve_invokehandle(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) { 1640 // This guy is reached from InterpreterRuntime::resolve_invokehandle. 1641 LinkInfo link_info(pool, index, CHECK); 1642 if (TraceMethodHandles) { 1643 ResourceMark rm(THREAD); 1644 tty->print_cr("resolve_invokehandle %s %s", link_info.name()->as_C_string(), 1645 link_info.signature()->as_C_string()); 1646 } 1647 resolve_handle_call(result, link_info, CHECK); 1648 } 1649 1650 void LinkResolver::resolve_handle_call(CallInfo& result, 1651 const LinkInfo& link_info, 1652 TRAPS) { 1653 // JSR 292: this must be an implicitly generated method MethodHandle.invokeExact(*...) or similar 1654 Klass* resolved_klass = link_info.resolved_klass(); 1655 assert(resolved_klass == SystemDictionary::MethodHandle_klass() || 1656 resolved_klass == SystemDictionary::VarHandle_klass(), ""); 1657 assert(MethodHandles::is_signature_polymorphic_name(link_info.name()), ""); 1658 Handle resolved_appendix; 1659 Handle resolved_method_type; 1660 methodHandle resolved_method = lookup_polymorphic_method(link_info, 1661 &resolved_appendix, &resolved_method_type, CHECK); 1662 result.set_handle(resolved_klass, resolved_method, resolved_appendix, resolved_method_type, CHECK); 1663 } 1664 1665 void LinkResolver::resolve_invokedynamic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) { 1666 Symbol* method_name = pool->name_ref_at(index); 1667 Symbol* method_signature = pool->signature_ref_at(index); 1668 Klass* current_klass = pool->pool_holder(); 1669 1670 // Resolve the bootstrap specifier (BSM + optional arguments). 1671 Handle bootstrap_specifier; 1672 // Check if CallSite has been bound already: 1673 ConstantPoolCacheEntry* cpce = pool->invokedynamic_cp_cache_entry_at(index); 1674 int pool_index = cpce->constant_pool_index(); 1675 1676 if (cpce->is_f1_null()) { 1677 if (cpce->indy_resolution_failed()) { 1678 ConstantPool::throw_resolution_error(pool, 1679 ResolutionErrorTable::encode_cpcache_index(index), 1680 CHECK); 1681 } 1682 1683 // The initial step in Call Site Specifier Resolution is to resolve the symbolic 1684 // reference to a method handle which will be the bootstrap method for a dynamic 1685 // call site. If resolution for the java.lang.invoke.MethodHandle for the bootstrap 1686 // method fails, then a MethodHandleInError is stored at the corresponding bootstrap 1687 // method's CP index for the CONSTANT_MethodHandle_info. So, there is no need to 1688 // set the indy_rf flag since any subsequent invokedynamic instruction which shares 1689 // this bootstrap method will encounter the resolution of MethodHandleInError. 1690 oop bsm_info = pool->resolve_bootstrap_specifier_at(pool_index, THREAD); 1691 Exceptions::wrap_dynamic_exception(CHECK); 1692 assert(bsm_info != NULL, ""); 1693 // FIXME: Cache this once per BootstrapMethods entry, not once per CONSTANT_InvokeDynamic. 1694 bootstrap_specifier = Handle(THREAD, bsm_info); 1695 } 1696 if (!cpce->is_f1_null()) { 1697 methodHandle method( THREAD, cpce->f1_as_method()); 1698 Handle appendix( THREAD, cpce->appendix_if_resolved(pool)); 1699 Handle method_type(THREAD, cpce->method_type_if_resolved(pool)); 1700 result.set_handle(method, appendix, method_type, THREAD); 1701 Exceptions::wrap_dynamic_exception(CHECK); 1702 return; 1703 } 1704 1705 if (TraceMethodHandles) { 1706 ResourceMark rm(THREAD); 1707 tty->print_cr("resolve_invokedynamic #%d %s %s in %s", 1708 ConstantPool::decode_invokedynamic_index(index), 1709 method_name->as_C_string(), method_signature->as_C_string(), 1710 current_klass->name()->as_C_string()); 1711 tty->print(" BSM info: "); bootstrap_specifier->print(); 1712 } 1713 1714 resolve_dynamic_call(result, pool_index, bootstrap_specifier, method_name, 1715 method_signature, current_klass, THREAD); 1716 if (HAS_PENDING_EXCEPTION && PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { 1717 int encoded_index = ResolutionErrorTable::encode_cpcache_index(index); 1718 bool recorded_res_status = cpce->save_and_throw_indy_exc(pool, pool_index, 1719 encoded_index, 1720 pool()->tag_at(pool_index), 1721 CHECK); 1722 if (!recorded_res_status) { 1723 // Another thread got here just before we did. So, either use the method 1724 // that it resolved or throw the LinkageError exception that it threw. 1725 if (!cpce->is_f1_null()) { 1726 methodHandle method( THREAD, cpce->f1_as_method()); 1727 Handle appendix( THREAD, cpce->appendix_if_resolved(pool)); 1728 Handle method_type(THREAD, cpce->method_type_if_resolved(pool)); 1729 result.set_handle(method, appendix, method_type, THREAD); 1730 Exceptions::wrap_dynamic_exception(CHECK); 1731 } else { 1732 assert(cpce->indy_resolution_failed(), "Resolution failure flag not set"); 1733 ConstantPool::throw_resolution_error(pool, encoded_index, CHECK); 1734 } 1735 return; 1736 } 1737 assert(cpce->indy_resolution_failed(), "Resolution failure flag wasn't set"); 1738 } 1739 } 1740 1741 void LinkResolver::resolve_dynamic_call(CallInfo& result, 1742 int pool_index, 1743 Handle bootstrap_specifier, 1744 Symbol* method_name, Symbol* method_signature, 1745 Klass* current_klass, 1746 TRAPS) { 1747 // JSR 292: this must resolve to an implicitly generated method MH.linkToCallSite(*...) 1748 // The appendix argument is likely to be a freshly-created CallSite. 1749 Handle resolved_appendix; 1750 Handle resolved_method_type; 1751 methodHandle resolved_method = 1752 SystemDictionary::find_dynamic_call_site_invoker(current_klass, 1753 pool_index, 1754 bootstrap_specifier, 1755 method_name, method_signature, 1756 &resolved_appendix, 1757 &resolved_method_type, 1758 THREAD); 1759 Exceptions::wrap_dynamic_exception(CHECK); 1760 result.set_handle(resolved_method, resolved_appendix, resolved_method_type, THREAD); 1761 Exceptions::wrap_dynamic_exception(CHECK); 1762 } 1763 1764 // Selected method is abstract. 1765 void LinkResolver::throw_abstract_method_error(const methodHandle& resolved_method, 1766 const methodHandle& selected_method, 1767 Klass *recv_klass, TRAPS) { 1768 Klass *resolved_klass = resolved_method->method_holder(); 1769 ResourceMark rm(THREAD); 1770 stringStream ss; 1771 1772 if (recv_klass != NULL) { 1773 ss.print("Receiver class %s does not define or inherit an " 1774 "implementation of the", 1775 recv_klass->external_name()); 1776 } else { 1777 ss.print("Missing implementation of"); 1778 } 1779 1780 assert(resolved_method.not_null(), "Sanity"); 1781 ss.print(" resolved method %s%s%s%s of %s %s.", 1782 resolved_method->is_abstract() ? "abstract " : "", 1783 resolved_method->is_private() ? "private " : "", 1784 resolved_method->name()->as_C_string(), 1785 resolved_method->signature()->as_C_string(), 1786 resolved_klass->external_kind(), 1787 resolved_klass->external_name()); 1788 1789 if (selected_method.not_null() && !(resolved_method == selected_method)) { 1790 ss.print(" Selected method is %s%s%s.", 1791 selected_method->is_abstract() ? "abstract " : "", 1792 selected_method->is_private() ? "private " : "", 1793 selected_method->name_and_sig_as_C_string()); 1794 } 1795 1796 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string()); 1797 }