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 %s of the current class, %s," 659 " and the class loader %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 = java_lang_ClassLoader::describe_external(current_loader()); 663 char* current = link_info.current_klass()->name()->as_C_string(); 664 const char* loader2_name = java_lang_ClassLoader::describe_external(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\" of type %s, the class loader %s of the current class, " 692 "%s, and the class loader %s for the field's defining " 693 "type, %s, have different Class objects for type %s"; 694 const char* field_name = field->as_C_string(); 695 const char* loader1_name = java_lang_ClassLoader::describe_external(ref_loader()); 696 const char* sel = sel_klass->external_name(); 697 const char* loader2_name = java_lang_ClassLoader::describe_external(sel_loader()); 698 const char* failed_type_name = failed_type_symbol->as_klass_external_name(); 699 const char* curr_klass_name = current_klass->external_name(); 700 size_t buflen = strlen(msg) + strlen(field_name) + 2 * strlen(failed_type_name) + 701 strlen(loader1_name) + strlen(curr_klass_name) + 702 strlen(loader2_name) + strlen(sel) + 1; 703 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); 704 jio_snprintf(buf, buflen, msg, field_name, failed_type_name, loader1_name, 705 curr_klass_name, loader2_name, sel, failed_type_name); 706 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); 707 } 708 } 709 710 methodHandle LinkResolver::resolve_method(const LinkInfo& link_info, 711 Bytecodes::Code code, TRAPS) { 712 713 Handle nested_exception; 714 Klass* resolved_klass = link_info.resolved_klass(); 715 716 // 1. For invokevirtual, cannot call an interface method 717 if (code == Bytecodes::_invokevirtual && resolved_klass->is_interface()) { 718 ResourceMark rm(THREAD); 719 char buf[200]; 720 jio_snprintf(buf, sizeof(buf), "Found interface %s, but class was expected", 721 resolved_klass->external_name()); 722 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 723 } 724 725 // 2. check constant pool tag for called method - must be JVM_CONSTANT_Methodref 726 if (!link_info.tag().is_invalid() && !link_info.tag().is_method()) { 727 ResourceMark rm(THREAD); 728 char buf[200]; 729 jio_snprintf(buf, sizeof(buf), "Method %s must be Methodref constant", link_info.method_string()); 730 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 731 } 732 733 // 3. lookup method in resolved klass and its super klasses 734 methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, true, false)); 735 736 // 4. lookup method in all the interfaces implemented by the resolved klass 737 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) { // not found in the class hierarchy 738 resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info)); 739 740 if (resolved_method.is_null()) { 741 // JSR 292: see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc 742 resolved_method = lookup_polymorphic_method(link_info, (Handle*)NULL, (Handle*)NULL, THREAD); 743 if (HAS_PENDING_EXCEPTION) { 744 nested_exception = Handle(THREAD, PENDING_EXCEPTION); 745 CLEAR_PENDING_EXCEPTION; 746 } 747 } 748 } 749 750 // 5. method lookup failed 751 if (resolved_method.is_null()) { 752 ResourceMark rm(THREAD); 753 THROW_MSG_CAUSE_(vmSymbols::java_lang_NoSuchMethodError(), 754 Method::name_and_sig_as_C_string(resolved_klass, 755 link_info.name(), 756 link_info.signature()), 757 nested_exception, NULL); 758 } 759 760 // 5. access checks, access checking may be turned off when calling from within the VM. 761 Klass* current_klass = link_info.current_klass(); 762 if (link_info.check_access()) { 763 assert(current_klass != NULL , "current_klass should not be null"); 764 765 // check if method can be accessed by the referring class 766 check_method_accessability(current_klass, 767 resolved_klass, 768 resolved_method->method_holder(), 769 resolved_method, 770 CHECK_NULL); 771 772 // check loader constraints 773 check_method_loader_constraints(link_info, resolved_method, "method", CHECK_NULL); 774 } 775 776 return resolved_method; 777 } 778 779 static void trace_method_resolution(const char* prefix, 780 Klass* klass, 781 Klass* resolved_klass, 782 const methodHandle& method, 783 bool logitables, 784 int index = -1) { 785 #ifndef PRODUCT 786 ResourceMark rm; 787 Log(itables) logi; 788 LogStream lsi(logi.trace()); 789 Log(vtables) logv; 790 LogStream lsv(logv.trace()); 791 outputStream* st; 792 if (logitables) { 793 st = &lsi; 794 } else { 795 st = &lsv; 796 } 797 st->print("%s%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ", 798 prefix, 799 (klass == NULL ? "<NULL>" : klass->internal_name()), 800 (resolved_klass == NULL ? "<NULL>" : resolved_klass->internal_name()), 801 Method::name_and_sig_as_C_string(resolved_klass, 802 method->name(), 803 method->signature()), 804 method->method_holder()->internal_name()); 805 method->print_linkage_flags(st); 806 if (index != -1) { 807 st->print("vtable_index:%d", index); 808 } 809 st->cr(); 810 #endif // PRODUCT 811 } 812 813 // Do linktime resolution of a method in the interface within the context of the specied bytecode. 814 methodHandle LinkResolver::resolve_interface_method(const LinkInfo& link_info, Bytecodes::Code code, TRAPS) { 815 816 Klass* resolved_klass = link_info.resolved_klass(); 817 818 // check if klass is interface 819 if (!resolved_klass->is_interface()) { 820 ResourceMark rm(THREAD); 821 char buf[200]; 822 jio_snprintf(buf, sizeof(buf), "Found class %s, but interface was expected", resolved_klass->external_name()); 823 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 824 } 825 826 // check constant pool tag for called method - must be JVM_CONSTANT_InterfaceMethodref 827 if (!link_info.tag().is_invalid() && !link_info.tag().is_interface_method()) { 828 ResourceMark rm(THREAD); 829 char buf[200]; 830 jio_snprintf(buf, sizeof(buf), "Method %s must be InterfaceMethodref constant", link_info.method_string()); 831 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 832 } 833 834 // lookup method in this interface or its super, java.lang.Object 835 // JDK8: also look for static methods 836 methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, false, true)); 837 838 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) { 839 // lookup method in all the super-interfaces 840 resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info)); 841 } 842 843 if (resolved_method.is_null()) { 844 // no method found 845 ResourceMark rm(THREAD); 846 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), 847 Method::name_and_sig_as_C_string(resolved_klass, 848 link_info.name(), 849 link_info.signature())); 850 } 851 852 if (link_info.check_access()) { 853 // JDK8 adds non-public interface methods, and accessability check requirement 854 Klass* current_klass = link_info.current_klass(); 855 856 assert(current_klass != NULL , "current_klass should not be null"); 857 858 // check if method can be accessed by the referring class 859 check_method_accessability(current_klass, 860 resolved_klass, 861 resolved_method->method_holder(), 862 resolved_method, 863 CHECK_NULL); 864 865 check_method_loader_constraints(link_info, resolved_method, "interface method", CHECK_NULL); 866 } 867 868 if (code != Bytecodes::_invokestatic && resolved_method->is_static()) { 869 ResourceMark rm(THREAD); 870 char buf[200]; 871 jio_snprintf(buf, sizeof(buf), "Expected instance not static method %s", 872 Method::name_and_sig_as_C_string(resolved_klass, 873 resolved_method->name(), resolved_method->signature())); 874 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 875 } 876 877 if (code == Bytecodes::_invokeinterface && resolved_method->is_private()) { 878 ResourceMark rm(THREAD); 879 char buf[200]; 880 881 Klass* current_klass = link_info.current_klass(); 882 jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokeinterface: method %s, caller-class:%s", 883 Method::name_and_sig_as_C_string(resolved_klass, 884 resolved_method->name(), 885 resolved_method->signature()), 886 (current_klass == NULL ? "<NULL>" : current_klass->internal_name())); 887 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 888 } 889 890 if (log_develop_is_enabled(Trace, itables)) { 891 char buf[200]; 892 jio_snprintf(buf, sizeof(buf), "%s resolved interface method: caller-class:", 893 Bytecodes::name(code)); 894 trace_method_resolution(buf, link_info.current_klass(), resolved_klass, 895 resolved_method, true); 896 } 897 898 return resolved_method; 899 } 900 901 //------------------------------------------------------------------------------------------------------------------------ 902 // Field resolution 903 904 void LinkResolver::check_field_accessability(Klass* ref_klass, 905 Klass* resolved_klass, 906 Klass* sel_klass, 907 const fieldDescriptor& fd, 908 TRAPS) { 909 if (!Reflection::verify_field_access(ref_klass, 910 resolved_klass, 911 sel_klass, 912 fd.access_flags(), 913 true)) { 914 ResourceMark rm(THREAD); 915 Exceptions::fthrow( 916 THREAD_AND_LOCATION, 917 vmSymbols::java_lang_IllegalAccessError(), 918 "tried to access field %s.%s from class %s", 919 sel_klass->external_name(), 920 fd.name()->as_C_string(), 921 ref_klass->external_name() 922 ); 923 return; 924 } 925 } 926 927 void LinkResolver::resolve_field_access(fieldDescriptor& fd, const constantPoolHandle& pool, int index, const methodHandle& method, Bytecodes::Code byte, TRAPS) { 928 LinkInfo link_info(pool, index, method, CHECK); 929 resolve_field(fd, link_info, byte, true, CHECK); 930 } 931 932 void LinkResolver::resolve_field(fieldDescriptor& fd, 933 const LinkInfo& link_info, 934 Bytecodes::Code byte, bool initialize_class, 935 TRAPS) { 936 assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic || 937 byte == Bytecodes::_getfield || byte == Bytecodes::_putfield || 938 byte == Bytecodes::_nofast_getfield || byte == Bytecodes::_nofast_putfield || 939 (byte == Bytecodes::_nop && !link_info.check_access()), "bad field access bytecode"); 940 941 bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic); 942 bool is_put = (byte == Bytecodes::_putfield || byte == Bytecodes::_putstatic || byte == Bytecodes::_nofast_putfield); 943 // Check if there's a resolved klass containing the field 944 Klass* resolved_klass = link_info.resolved_klass(); 945 Symbol* field = link_info.name(); 946 Symbol* sig = link_info.signature(); 947 948 if (resolved_klass == NULL) { 949 ResourceMark rm(THREAD); 950 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string()); 951 } 952 953 // Resolve instance field 954 Klass* sel_klass = resolved_klass->find_field(field, sig, &fd); 955 // check if field exists; i.e., if a klass containing the field def has been selected 956 if (sel_klass == NULL) { 957 ResourceMark rm(THREAD); 958 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string()); 959 } 960 961 if (!link_info.check_access()) 962 // Access checking may be turned off when calling from within the VM. 963 return; 964 965 // check access 966 Klass* current_klass = link_info.current_klass(); 967 check_field_accessability(current_klass, resolved_klass, sel_klass, fd, CHECK); 968 969 // check for errors 970 if (is_static != fd.is_static()) { 971 ResourceMark rm(THREAD); 972 char msg[200]; 973 jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string()); 974 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg); 975 } 976 977 // A final field can be modified only 978 // (1) by methods declared in the class declaring the field and 979 // (2) by the <clinit> method (in case of a static field) 980 // or by the <init> method (in case of an instance field). 981 if (is_put && fd.access_flags().is_final()) { 982 ResourceMark rm(THREAD); 983 stringStream ss; 984 985 if (sel_klass != current_klass) { 986 ss.print("Update to %s final field %s.%s attempted from a different class (%s) than the field's declaring class", 987 is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(), 988 current_klass->external_name()); 989 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string()); 990 } 991 992 if (fd.constants()->pool_holder()->major_version() >= 53) { 993 methodHandle m = link_info.current_method(); 994 assert(!m.is_null(), "information about the current method must be available for 'put' bytecodes"); 995 bool is_initialized_static_final_update = (byte == Bytecodes::_putstatic && 996 fd.is_static() && 997 !m()->is_static_initializer()); 998 bool is_initialized_instance_final_update = ((byte == Bytecodes::_putfield || byte == Bytecodes::_nofast_putfield) && 999 !fd.is_static() && 1000 !m->is_object_initializer()); 1001 1002 if (is_initialized_static_final_update || is_initialized_instance_final_update) { 1003 ss.print("Update to %s final field %s.%s attempted from a different method (%s) than the initializer method %s ", 1004 is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(), 1005 m()->name()->as_C_string(), 1006 is_static ? "<clinit>" : "<init>"); 1007 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string()); 1008 } 1009 } 1010 } 1011 1012 // initialize resolved_klass if necessary 1013 // note 1: the klass which declared the field must be initialized (i.e, sel_klass) 1014 // according to the newest JVM spec (5.5, p.170) - was bug (gri 7/28/99) 1015 // 1016 // note 2: we don't want to force initialization if we are just checking 1017 // if the field access is legal; e.g., during compilation 1018 if (is_static && initialize_class) { 1019 sel_klass->initialize(CHECK); 1020 } 1021 1022 if (sel_klass != current_klass) { 1023 check_field_loader_constraints(field, sig, current_klass, sel_klass, CHECK); 1024 } 1025 1026 // return information. note that the klass is set to the actual klass containing the 1027 // field, otherwise access of static fields in superclasses will not work. 1028 } 1029 1030 1031 //------------------------------------------------------------------------------------------------------------------------ 1032 // Invoke resolution 1033 // 1034 // Naming conventions: 1035 // 1036 // resolved_method the specified method (i.e., static receiver specified via constant pool index) 1037 // sel_method the selected method (selected via run-time lookup; e.g., based on dynamic receiver class) 1038 // resolved_klass the specified klass (i.e., specified via constant pool index) 1039 // recv_klass the receiver klass 1040 1041 1042 void LinkResolver::resolve_static_call(CallInfo& result, 1043 const LinkInfo& link_info, 1044 bool initialize_class, TRAPS) { 1045 methodHandle resolved_method = linktime_resolve_static_method(link_info, CHECK); 1046 1047 // The resolved class can change as a result of this resolution. 1048 Klass* resolved_klass = resolved_method->method_holder(); 1049 1050 // Initialize klass (this should only happen if everything is ok) 1051 if (initialize_class && resolved_klass->should_be_initialized()) { 1052 resolved_klass->initialize(CHECK); 1053 // Use updated LinkInfo to reresolve with resolved method holder 1054 LinkInfo new_info(resolved_klass, link_info.name(), link_info.signature(), 1055 link_info.current_klass(), 1056 link_info.check_access() ? LinkInfo::needs_access_check : LinkInfo::skip_access_check); 1057 resolved_method = linktime_resolve_static_method(new_info, CHECK); 1058 } 1059 1060 // setup result 1061 result.set_static(resolved_klass, resolved_method, CHECK); 1062 } 1063 1064 // throws linktime exceptions 1065 methodHandle LinkResolver::linktime_resolve_static_method(const LinkInfo& link_info, TRAPS) { 1066 1067 Klass* resolved_klass = link_info.resolved_klass(); 1068 methodHandle resolved_method; 1069 if (!resolved_klass->is_interface()) { 1070 resolved_method = resolve_method(link_info, Bytecodes::_invokestatic, CHECK_NULL); 1071 } else { 1072 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokestatic, CHECK_NULL); 1073 } 1074 assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier"); 1075 1076 // check if static 1077 if (!resolved_method->is_static()) { 1078 ResourceMark rm(THREAD); 1079 char buf[200]; 1080 jio_snprintf(buf, sizeof(buf), "Expected static method %s", Method::name_and_sig_as_C_string(resolved_klass, 1081 resolved_method->name(), 1082 resolved_method->signature())); 1083 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1084 } 1085 return resolved_method; 1086 } 1087 1088 1089 void LinkResolver::resolve_special_call(CallInfo& result, 1090 Handle recv, 1091 const LinkInfo& link_info, 1092 TRAPS) { 1093 methodHandle resolved_method = linktime_resolve_special_method(link_info, CHECK); 1094 runtime_resolve_special_method(result, link_info, resolved_method, recv, CHECK); 1095 } 1096 1097 // throws linktime exceptions 1098 methodHandle LinkResolver::linktime_resolve_special_method(const LinkInfo& link_info, 1099 TRAPS) { 1100 1101 // Invokespecial is called for multiple special reasons: 1102 // <init> 1103 // local private method invocation, for classes and interfaces 1104 // superclass.method, which can also resolve to a default method 1105 // and the selected method is recalculated relative to the direct superclass 1106 // superinterface.method, which explicitly does not check shadowing 1107 Klass* resolved_klass = link_info.resolved_klass(); 1108 methodHandle resolved_method; 1109 1110 if (!resolved_klass->is_interface()) { 1111 resolved_method = resolve_method(link_info, Bytecodes::_invokespecial, CHECK_NULL); 1112 } else { 1113 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokespecial, CHECK_NULL); 1114 } 1115 1116 // check if method name is <init>, that it is found in same klass as static type 1117 if (resolved_method->name() == vmSymbols::object_initializer_name() && 1118 resolved_method->method_holder() != resolved_klass) { 1119 ResourceMark rm(THREAD); 1120 Exceptions::fthrow( 1121 THREAD_AND_LOCATION, 1122 vmSymbols::java_lang_NoSuchMethodError(), 1123 "%s: method %s%s not found", 1124 resolved_klass->external_name(), 1125 resolved_method->name()->as_C_string(), 1126 resolved_method->signature()->as_C_string() 1127 ); 1128 return NULL; 1129 } 1130 1131 // check if invokespecial's interface method reference is in an indirect superinterface 1132 Klass* current_klass = link_info.current_klass(); 1133 if (current_klass != NULL && resolved_klass->is_interface()) { 1134 InstanceKlass* ck = InstanceKlass::cast(current_klass); 1135 InstanceKlass *klass_to_check = !ck->is_anonymous() ? 1136 ck : 1137 InstanceKlass::cast(ck->host_klass()); 1138 // Disable verification for the dynamically-generated reflection bytecodes. 1139 bool is_reflect = klass_to_check->is_subclass_of( 1140 SystemDictionary::reflect_MagicAccessorImpl_klass()); 1141 1142 if (!is_reflect && 1143 !klass_to_check->is_same_or_direct_interface(resolved_klass)) { 1144 ResourceMark rm(THREAD); 1145 char buf[200]; 1146 jio_snprintf(buf, sizeof(buf), 1147 "Interface method reference: %s, is in an indirect superinterface of %s", 1148 Method::name_and_sig_as_C_string(resolved_klass, 1149 resolved_method->name(), 1150 resolved_method->signature()), 1151 current_klass->external_name()); 1152 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1153 } 1154 } 1155 1156 // check if not static 1157 if (resolved_method->is_static()) { 1158 ResourceMark rm(THREAD); 1159 char buf[200]; 1160 jio_snprintf(buf, sizeof(buf), 1161 "Expecting non-static method %s", 1162 Method::name_and_sig_as_C_string(resolved_klass, 1163 resolved_method->name(), 1164 resolved_method->signature())); 1165 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1166 } 1167 1168 if (log_develop_is_enabled(Trace, itables)) { 1169 trace_method_resolution("invokespecial resolved method: caller-class:", 1170 current_klass, resolved_klass, resolved_method, true); 1171 } 1172 1173 return resolved_method; 1174 } 1175 1176 // throws runtime exceptions 1177 void LinkResolver::runtime_resolve_special_method(CallInfo& result, 1178 const LinkInfo& link_info, 1179 const methodHandle& resolved_method, 1180 Handle recv, TRAPS) { 1181 1182 Klass* resolved_klass = link_info.resolved_klass(); 1183 1184 // resolved method is selected method unless we have an old-style lookup 1185 // for a superclass method 1186 // Invokespecial for a superinterface, resolved method is selected method, 1187 // no checks for shadowing 1188 methodHandle sel_method(THREAD, resolved_method()); 1189 1190 if (link_info.check_access() && 1191 // check if the method is not <init> 1192 resolved_method->name() != vmSymbols::object_initializer_name()) { 1193 1194 // check if this is an old-style super call and do a new lookup if so 1195 // a) check if ACC_SUPER flag is set for the current class 1196 Klass* current_klass = link_info.current_klass(); 1197 if ((current_klass->is_super() || !AllowNonVirtualCalls) && 1198 // b) check if the class of the resolved_klass is a superclass 1199 // (not supertype in order to exclude interface classes) of the current class. 1200 // This check is not performed for super.invoke for interface methods 1201 // in super interfaces. 1202 current_klass->is_subclass_of(resolved_klass) && 1203 current_klass != resolved_klass) { 1204 // Lookup super method 1205 Klass* super_klass = current_klass->super(); 1206 sel_method = lookup_instance_method_in_klasses(super_klass, 1207 resolved_method->name(), 1208 resolved_method->signature(), CHECK); 1209 // check if found 1210 if (sel_method.is_null()) { 1211 ResourceMark rm(THREAD); 1212 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), 1213 Method::name_and_sig_as_C_string(resolved_klass, 1214 resolved_method->name(), 1215 resolved_method->signature())); 1216 // check loader constraints if found a different method 1217 } else if (sel_method() != resolved_method()) { 1218 check_method_loader_constraints(link_info, sel_method, "method", CHECK); 1219 } 1220 } 1221 1222 // Check that the class of objectref (the receiver) is the current class or interface, 1223 // or a subtype of the current class or interface (the sender), otherwise invokespecial 1224 // throws IllegalAccessError. 1225 // The verifier checks that the sender is a subtype of the class in the I/MR operand. 1226 // The verifier also checks that the receiver is a subtype of the sender, if the sender is 1227 // a class. If the sender is an interface, the check has to be performed at runtime. 1228 InstanceKlass* sender = InstanceKlass::cast(current_klass); 1229 sender = sender->is_anonymous() ? sender->host_klass() : sender; 1230 if (sender->is_interface() && recv.not_null()) { 1231 Klass* receiver_klass = recv->klass(); 1232 if (!receiver_klass->is_subtype_of(sender)) { 1233 ResourceMark rm(THREAD); 1234 char buf[500]; 1235 jio_snprintf(buf, sizeof(buf), 1236 "Receiver class %s must be the current class or a subtype of interface %s", 1237 receiver_klass->name()->as_C_string(), 1238 sender->name()->as_C_string()); 1239 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), buf); 1240 } 1241 } 1242 } 1243 1244 // check if not static 1245 if (sel_method->is_static()) { 1246 ResourceMark rm(THREAD); 1247 char buf[200]; 1248 jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass, 1249 resolved_method->name(), 1250 resolved_method->signature())); 1251 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1252 } 1253 1254 // check if abstract 1255 if (sel_method->is_abstract()) { 1256 ResourceMark rm(THREAD); 1257 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), 1258 Method::name_and_sig_as_C_string(resolved_klass, 1259 sel_method->name(), 1260 sel_method->signature())); 1261 } 1262 1263 if (log_develop_is_enabled(Trace, itables)) { 1264 trace_method_resolution("invokespecial selected method: resolved-class:", 1265 resolved_klass, resolved_klass, sel_method, true); 1266 } 1267 1268 // setup result 1269 result.set_static(resolved_klass, sel_method, CHECK); 1270 } 1271 1272 void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, Klass* receiver_klass, 1273 const LinkInfo& link_info, 1274 bool check_null_and_abstract, TRAPS) { 1275 methodHandle resolved_method = linktime_resolve_virtual_method(link_info, CHECK); 1276 runtime_resolve_virtual_method(result, resolved_method, 1277 link_info.resolved_klass(), 1278 recv, receiver_klass, 1279 check_null_and_abstract, CHECK); 1280 } 1281 1282 // throws linktime exceptions 1283 methodHandle LinkResolver::linktime_resolve_virtual_method(const LinkInfo& link_info, 1284 TRAPS) { 1285 // normal method resolution 1286 methodHandle resolved_method = resolve_method(link_info, Bytecodes::_invokevirtual, CHECK_NULL); 1287 1288 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier"); 1289 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier"); 1290 1291 // check if private interface method 1292 Klass* resolved_klass = link_info.resolved_klass(); 1293 Klass* current_klass = link_info.current_klass(); 1294 1295 // This is impossible, if resolve_klass is an interface, we've thrown icce in resolve_method 1296 if (resolved_klass->is_interface() && resolved_method->is_private()) { 1297 ResourceMark rm(THREAD); 1298 char buf[200]; 1299 jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokevirtual: method %s, caller-class:%s", 1300 Method::name_and_sig_as_C_string(resolved_klass, 1301 resolved_method->name(), 1302 resolved_method->signature()), 1303 (current_klass == NULL ? "<NULL>" : current_klass->internal_name())); 1304 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1305 } 1306 1307 // check if not static 1308 if (resolved_method->is_static()) { 1309 ResourceMark rm(THREAD); 1310 char buf[200]; 1311 jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass, 1312 resolved_method->name(), 1313 resolved_method->signature())); 1314 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1315 } 1316 1317 if (log_develop_is_enabled(Trace, vtables)) { 1318 trace_method_resolution("invokevirtual resolved method: caller-class:", 1319 current_klass, resolved_klass, resolved_method, false); 1320 } 1321 1322 return resolved_method; 1323 } 1324 1325 // throws runtime exceptions 1326 void LinkResolver::runtime_resolve_virtual_method(CallInfo& result, 1327 const methodHandle& resolved_method, 1328 Klass* resolved_klass, 1329 Handle recv, 1330 Klass* recv_klass, 1331 bool check_null_and_abstract, 1332 TRAPS) { 1333 1334 // setup default return values 1335 int vtable_index = Method::invalid_vtable_index; 1336 methodHandle selected_method; 1337 1338 // runtime method resolution 1339 if (check_null_and_abstract && recv.is_null()) { // check if receiver exists 1340 THROW(vmSymbols::java_lang_NullPointerException()); 1341 } 1342 1343 // Virtual methods cannot be resolved before its klass has been linked, for otherwise the Method*'s 1344 // has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since 1345 // a missing receiver might result in a bogus lookup. 1346 assert(resolved_method->method_holder()->is_linked(), "must be linked"); 1347 1348 // do lookup based on receiver klass using the vtable index 1349 if (resolved_method->method_holder()->is_interface()) { // default or miranda method 1350 vtable_index = vtable_index_of_interface_method(resolved_klass, resolved_method); 1351 assert(vtable_index >= 0 , "we should have valid vtable index at this point"); 1352 1353 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index)); 1354 } else { 1355 // at this point we are sure that resolved_method is virtual and not 1356 // a default or miranda method; therefore, it must have a valid vtable index. 1357 assert(!resolved_method->has_itable_index(), ""); 1358 vtable_index = resolved_method->vtable_index(); 1359 // We could get a negative vtable_index for final methods, 1360 // because as an optimization they are never put in the vtable, 1361 // unless they override an existing method. 1362 // If we do get a negative, it means the resolved method is the the selected 1363 // method, and it can never be changed by an override. 1364 if (vtable_index == Method::nonvirtual_vtable_index) { 1365 assert(resolved_method->can_be_statically_bound(), "cannot override this method"); 1366 selected_method = resolved_method; 1367 } else { 1368 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index)); 1369 } 1370 } 1371 1372 // check if method exists 1373 if (selected_method.is_null()) { 1374 throw_abstract_method_error(resolved_method, recv_klass, CHECK); 1375 } 1376 1377 // check if abstract 1378 if (check_null_and_abstract && selected_method->is_abstract()) { 1379 // Pass arguments for generating a verbose error message. 1380 throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK); 1381 } 1382 1383 if (log_develop_is_enabled(Trace, vtables)) { 1384 trace_method_resolution("invokevirtual selected method: receiver-class:", 1385 recv_klass, resolved_klass, selected_method, 1386 false, vtable_index); 1387 } 1388 // setup result 1389 result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK); 1390 } 1391 1392 void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, Klass* recv_klass, 1393 const LinkInfo& link_info, 1394 bool check_null_and_abstract, TRAPS) { 1395 // throws linktime exceptions 1396 methodHandle resolved_method = linktime_resolve_interface_method(link_info, CHECK); 1397 runtime_resolve_interface_method(result, resolved_method,link_info.resolved_klass(), 1398 recv, recv_klass, check_null_and_abstract, CHECK); 1399 } 1400 1401 methodHandle LinkResolver::linktime_resolve_interface_method(const LinkInfo& link_info, 1402 TRAPS) { 1403 // normal interface method resolution 1404 methodHandle resolved_method = resolve_interface_method(link_info, Bytecodes::_invokeinterface, CHECK_NULL); 1405 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier"); 1406 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier"); 1407 1408 return resolved_method; 1409 } 1410 1411 // throws runtime exceptions 1412 void LinkResolver::runtime_resolve_interface_method(CallInfo& result, 1413 const methodHandle& resolved_method, 1414 Klass* resolved_klass, 1415 Handle recv, 1416 Klass* recv_klass, 1417 bool check_null_and_abstract, TRAPS) { 1418 // check if receiver exists 1419 if (check_null_and_abstract && recv.is_null()) { 1420 THROW(vmSymbols::java_lang_NullPointerException()); 1421 } 1422 1423 // check if receiver klass implements the resolved interface 1424 if (!recv_klass->is_subtype_of(resolved_klass)) { 1425 ResourceMark rm(THREAD); 1426 char buf[200]; 1427 jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s", 1428 recv_klass->external_name(), 1429 resolved_klass->external_name()); 1430 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1431 } 1432 1433 // do lookup based on receiver klass 1434 // This search must match the linktime preparation search for itable initialization 1435 // to correctly enforce loader constraints for interface method inheritance 1436 methodHandle selected_method = lookup_instance_method_in_klasses(recv_klass, 1437 resolved_method->name(), 1438 resolved_method->signature(), CHECK); 1439 if (selected_method.is_null() && !check_null_and_abstract) { 1440 // In theory this is a harmless placeholder value, but 1441 // in practice leaving in null affects the nsk default method tests. 1442 // This needs further study. 1443 selected_method = resolved_method; 1444 } 1445 // check if method exists 1446 if (selected_method.is_null()) { 1447 // Pass arguments for generating a verbose error message. 1448 throw_abstract_method_error(resolved_method, recv_klass, CHECK); 1449 } 1450 // check access 1451 // Throw Illegal Access Error if selected_method is not public. 1452 if (!selected_method->is_public()) { 1453 ResourceMark rm(THREAD); 1454 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), 1455 Method::name_and_sig_as_C_string(recv_klass, 1456 selected_method->name(), 1457 selected_method->signature())); 1458 } 1459 // check if abstract 1460 if (check_null_and_abstract && selected_method->is_abstract()) { 1461 throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK); 1462 } 1463 1464 if (log_develop_is_enabled(Trace, itables)) { 1465 trace_method_resolution("invokeinterface selected method: receiver-class:", 1466 recv_klass, resolved_klass, selected_method, true); 1467 } 1468 // setup result 1469 if (!resolved_method->has_itable_index()) { 1470 int vtable_index = resolved_method->vtable_index(); 1471 assert(vtable_index == selected_method->vtable_index(), "sanity check"); 1472 result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK); 1473 } else { 1474 int itable_index = resolved_method()->itable_index(); 1475 result.set_interface(resolved_klass, recv_klass, resolved_method, selected_method, itable_index, CHECK); 1476 } 1477 } 1478 1479 1480 methodHandle LinkResolver::linktime_resolve_interface_method_or_null( 1481 const LinkInfo& link_info) { 1482 EXCEPTION_MARK; 1483 methodHandle method_result = linktime_resolve_interface_method(link_info, THREAD); 1484 if (HAS_PENDING_EXCEPTION) { 1485 CLEAR_PENDING_EXCEPTION; 1486 return methodHandle(); 1487 } else { 1488 return method_result; 1489 } 1490 } 1491 1492 methodHandle LinkResolver::linktime_resolve_virtual_method_or_null( 1493 const LinkInfo& link_info) { 1494 EXCEPTION_MARK; 1495 methodHandle method_result = linktime_resolve_virtual_method(link_info, THREAD); 1496 if (HAS_PENDING_EXCEPTION) { 1497 CLEAR_PENDING_EXCEPTION; 1498 return methodHandle(); 1499 } else { 1500 return method_result; 1501 } 1502 } 1503 1504 methodHandle LinkResolver::resolve_virtual_call_or_null( 1505 Klass* receiver_klass, 1506 const LinkInfo& link_info) { 1507 EXCEPTION_MARK; 1508 CallInfo info; 1509 resolve_virtual_call(info, Handle(), receiver_klass, link_info, false, THREAD); 1510 if (HAS_PENDING_EXCEPTION) { 1511 CLEAR_PENDING_EXCEPTION; 1512 return methodHandle(); 1513 } 1514 return info.selected_method(); 1515 } 1516 1517 methodHandle LinkResolver::resolve_interface_call_or_null( 1518 Klass* receiver_klass, 1519 const LinkInfo& link_info) { 1520 EXCEPTION_MARK; 1521 CallInfo info; 1522 resolve_interface_call(info, Handle(), receiver_klass, link_info, false, THREAD); 1523 if (HAS_PENDING_EXCEPTION) { 1524 CLEAR_PENDING_EXCEPTION; 1525 return methodHandle(); 1526 } 1527 return info.selected_method(); 1528 } 1529 1530 int LinkResolver::resolve_virtual_vtable_index(Klass* receiver_klass, 1531 const LinkInfo& link_info) { 1532 EXCEPTION_MARK; 1533 CallInfo info; 1534 resolve_virtual_call(info, Handle(), receiver_klass, link_info, 1535 /*check_null_or_abstract*/false, THREAD); 1536 if (HAS_PENDING_EXCEPTION) { 1537 CLEAR_PENDING_EXCEPTION; 1538 return Method::invalid_vtable_index; 1539 } 1540 return info.vtable_index(); 1541 } 1542 1543 methodHandle LinkResolver::resolve_static_call_or_null(const LinkInfo& link_info) { 1544 EXCEPTION_MARK; 1545 CallInfo info; 1546 resolve_static_call(info, link_info, /*initialize_class*/false, THREAD); 1547 if (HAS_PENDING_EXCEPTION) { 1548 CLEAR_PENDING_EXCEPTION; 1549 return methodHandle(); 1550 } 1551 return info.selected_method(); 1552 } 1553 1554 methodHandle LinkResolver::resolve_special_call_or_null(const LinkInfo& link_info) { 1555 EXCEPTION_MARK; 1556 CallInfo info; 1557 resolve_special_call(info, Handle(), link_info, THREAD); 1558 if (HAS_PENDING_EXCEPTION) { 1559 CLEAR_PENDING_EXCEPTION; 1560 return methodHandle(); 1561 } 1562 return info.selected_method(); 1563 } 1564 1565 1566 1567 //------------------------------------------------------------------------------------------------------------------------ 1568 // ConstantPool entries 1569 1570 void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) { 1571 switch (byte) { 1572 case Bytecodes::_invokestatic : resolve_invokestatic (result, pool, index, CHECK); break; 1573 case Bytecodes::_invokespecial : resolve_invokespecial (result, recv, pool, index, CHECK); break; 1574 case Bytecodes::_invokevirtual : resolve_invokevirtual (result, recv, pool, index, CHECK); break; 1575 case Bytecodes::_invokehandle : resolve_invokehandle (result, pool, index, CHECK); break; 1576 case Bytecodes::_invokedynamic : resolve_invokedynamic (result, pool, index, CHECK); break; 1577 case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break; 1578 default : break; 1579 } 1580 return; 1581 } 1582 1583 void LinkResolver::resolve_invoke(CallInfo& result, Handle& recv, 1584 const methodHandle& attached_method, 1585 Bytecodes::Code byte, TRAPS) { 1586 Klass* defc = attached_method->method_holder(); 1587 Symbol* name = attached_method->name(); 1588 Symbol* type = attached_method->signature(); 1589 LinkInfo link_info(defc, name, type); 1590 switch(byte) { 1591 case Bytecodes::_invokevirtual: 1592 resolve_virtual_call(result, recv, recv->klass(), link_info, 1593 /*check_null_and_abstract=*/true, CHECK); 1594 break; 1595 case Bytecodes::_invokeinterface: 1596 resolve_interface_call(result, recv, recv->klass(), link_info, 1597 /*check_null_and_abstract=*/true, CHECK); 1598 break; 1599 case Bytecodes::_invokestatic: 1600 resolve_static_call(result, link_info, /*initialize_class=*/false, CHECK); 1601 break; 1602 case Bytecodes::_invokespecial: 1603 resolve_special_call(result, recv, link_info, CHECK); 1604 break; 1605 default: 1606 fatal("bad call: %s", Bytecodes::name(byte)); 1607 break; 1608 } 1609 } 1610 1611 void LinkResolver::resolve_invokestatic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) { 1612 LinkInfo link_info(pool, index, CHECK); 1613 resolve_static_call(result, link_info, /*initialize_class*/true, CHECK); 1614 } 1615 1616 1617 void LinkResolver::resolve_invokespecial(CallInfo& result, Handle recv, 1618 const constantPoolHandle& pool, int index, TRAPS) { 1619 LinkInfo link_info(pool, index, CHECK); 1620 resolve_special_call(result, recv, link_info, CHECK); 1621 } 1622 1623 1624 void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv, 1625 const constantPoolHandle& pool, int index, 1626 TRAPS) { 1627 1628 LinkInfo link_info(pool, index, CHECK); 1629 Klass* recvrKlass = recv.is_null() ? (Klass*)NULL : recv->klass(); 1630 resolve_virtual_call(result, recv, recvrKlass, link_info, /*check_null_or_abstract*/true, CHECK); 1631 } 1632 1633 1634 void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, TRAPS) { 1635 LinkInfo link_info(pool, index, CHECK); 1636 Klass* recvrKlass = recv.is_null() ? (Klass*)NULL : recv->klass(); 1637 resolve_interface_call(result, recv, recvrKlass, link_info, true, CHECK); 1638 } 1639 1640 1641 void LinkResolver::resolve_invokehandle(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) { 1642 // This guy is reached from InterpreterRuntime::resolve_invokehandle. 1643 LinkInfo link_info(pool, index, CHECK); 1644 if (TraceMethodHandles) { 1645 ResourceMark rm(THREAD); 1646 tty->print_cr("resolve_invokehandle %s %s", link_info.name()->as_C_string(), 1647 link_info.signature()->as_C_string()); 1648 } 1649 resolve_handle_call(result, link_info, CHECK); 1650 } 1651 1652 void LinkResolver::resolve_handle_call(CallInfo& result, 1653 const LinkInfo& link_info, 1654 TRAPS) { 1655 // JSR 292: this must be an implicitly generated method MethodHandle.invokeExact(*...) or similar 1656 Klass* resolved_klass = link_info.resolved_klass(); 1657 assert(resolved_klass == SystemDictionary::MethodHandle_klass() || 1658 resolved_klass == SystemDictionary::VarHandle_klass(), ""); 1659 assert(MethodHandles::is_signature_polymorphic_name(link_info.name()), ""); 1660 Handle resolved_appendix; 1661 Handle resolved_method_type; 1662 methodHandle resolved_method = lookup_polymorphic_method(link_info, 1663 &resolved_appendix, &resolved_method_type, CHECK); 1664 result.set_handle(resolved_klass, resolved_method, resolved_appendix, resolved_method_type, CHECK); 1665 } 1666 1667 void LinkResolver::resolve_invokedynamic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) { 1668 Symbol* method_name = pool->name_ref_at(index); 1669 Symbol* method_signature = pool->signature_ref_at(index); 1670 Klass* current_klass = pool->pool_holder(); 1671 1672 // Resolve the bootstrap specifier (BSM + optional arguments). 1673 Handle bootstrap_specifier; 1674 // Check if CallSite has been bound already: 1675 ConstantPoolCacheEntry* cpce = pool->invokedynamic_cp_cache_entry_at(index); 1676 int pool_index = cpce->constant_pool_index(); 1677 1678 if (cpce->is_f1_null()) { 1679 if (cpce->indy_resolution_failed()) { 1680 ConstantPool::throw_resolution_error(pool, 1681 ResolutionErrorTable::encode_cpcache_index(index), 1682 CHECK); 1683 } 1684 1685 // The initial step in Call Site Specifier Resolution is to resolve the symbolic 1686 // reference to a method handle which will be the bootstrap method for a dynamic 1687 // call site. If resolution for the java.lang.invoke.MethodHandle for the bootstrap 1688 // method fails, then a MethodHandleInError is stored at the corresponding bootstrap 1689 // method's CP index for the CONSTANT_MethodHandle_info. So, there is no need to 1690 // set the indy_rf flag since any subsequent invokedynamic instruction which shares 1691 // this bootstrap method will encounter the resolution of MethodHandleInError. 1692 oop bsm_info = pool->resolve_bootstrap_specifier_at(pool_index, THREAD); 1693 Exceptions::wrap_dynamic_exception(CHECK); 1694 assert(bsm_info != NULL, ""); 1695 // FIXME: Cache this once per BootstrapMethods entry, not once per CONSTANT_InvokeDynamic. 1696 bootstrap_specifier = Handle(THREAD, bsm_info); 1697 } 1698 if (!cpce->is_f1_null()) { 1699 methodHandle method( THREAD, cpce->f1_as_method()); 1700 Handle appendix( THREAD, cpce->appendix_if_resolved(pool)); 1701 Handle method_type(THREAD, cpce->method_type_if_resolved(pool)); 1702 result.set_handle(method, appendix, method_type, THREAD); 1703 Exceptions::wrap_dynamic_exception(CHECK); 1704 return; 1705 } 1706 1707 if (TraceMethodHandles) { 1708 ResourceMark rm(THREAD); 1709 tty->print_cr("resolve_invokedynamic #%d %s %s in %s", 1710 ConstantPool::decode_invokedynamic_index(index), 1711 method_name->as_C_string(), method_signature->as_C_string(), 1712 current_klass->name()->as_C_string()); 1713 tty->print(" BSM info: "); bootstrap_specifier->print(); 1714 } 1715 1716 resolve_dynamic_call(result, pool_index, bootstrap_specifier, method_name, 1717 method_signature, current_klass, THREAD); 1718 if (HAS_PENDING_EXCEPTION && PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { 1719 int encoded_index = ResolutionErrorTable::encode_cpcache_index(index); 1720 bool recorded_res_status = cpce->save_and_throw_indy_exc(pool, pool_index, 1721 encoded_index, 1722 pool()->tag_at(pool_index), 1723 CHECK); 1724 if (!recorded_res_status) { 1725 // Another thread got here just before we did. So, either use the method 1726 // that it resolved or throw the LinkageError exception that it threw. 1727 if (!cpce->is_f1_null()) { 1728 methodHandle method( THREAD, cpce->f1_as_method()); 1729 Handle appendix( THREAD, cpce->appendix_if_resolved(pool)); 1730 Handle method_type(THREAD, cpce->method_type_if_resolved(pool)); 1731 result.set_handle(method, appendix, method_type, THREAD); 1732 Exceptions::wrap_dynamic_exception(CHECK); 1733 } else { 1734 assert(cpce->indy_resolution_failed(), "Resolution failure flag not set"); 1735 ConstantPool::throw_resolution_error(pool, encoded_index, CHECK); 1736 } 1737 return; 1738 } 1739 assert(cpce->indy_resolution_failed(), "Resolution failure flag wasn't set"); 1740 } 1741 } 1742 1743 void LinkResolver::resolve_dynamic_call(CallInfo& result, 1744 int pool_index, 1745 Handle bootstrap_specifier, 1746 Symbol* method_name, Symbol* method_signature, 1747 Klass* current_klass, 1748 TRAPS) { 1749 // JSR 292: this must resolve to an implicitly generated method MH.linkToCallSite(*...) 1750 // The appendix argument is likely to be a freshly-created CallSite. 1751 Handle resolved_appendix; 1752 Handle resolved_method_type; 1753 methodHandle resolved_method = 1754 SystemDictionary::find_dynamic_call_site_invoker(current_klass, 1755 pool_index, 1756 bootstrap_specifier, 1757 method_name, method_signature, 1758 &resolved_appendix, 1759 &resolved_method_type, 1760 THREAD); 1761 Exceptions::wrap_dynamic_exception(CHECK); 1762 result.set_handle(resolved_method, resolved_appendix, resolved_method_type, THREAD); 1763 Exceptions::wrap_dynamic_exception(CHECK); 1764 } 1765 1766 // Selected method is abstract. 1767 void LinkResolver::throw_abstract_method_error(const methodHandle& resolved_method, 1768 const methodHandle& selected_method, 1769 Klass *recv_klass, TRAPS) { 1770 Klass *resolved_klass = resolved_method->method_holder(); 1771 ResourceMark rm(THREAD); 1772 stringStream ss; 1773 1774 if (recv_klass != NULL) { 1775 ss.print("Receiver class %s does not define or inherit an " 1776 "implementation of the", 1777 recv_klass->external_name()); 1778 } else { 1779 ss.print("Missing implementation of"); 1780 } 1781 1782 assert(resolved_method.not_null(), "Sanity"); 1783 ss.print(" resolved method %s%s%s%s of %s %s.", 1784 resolved_method->is_abstract() ? "abstract " : "", 1785 resolved_method->is_private() ? "private " : "", 1786 resolved_method->name()->as_C_string(), 1787 resolved_method->signature()->as_C_string(), 1788 resolved_klass->external_kind(), 1789 resolved_klass->external_name()); 1790 1791 if (selected_method.not_null() && !(resolved_method == selected_method)) { 1792 ss.print(" Selected method is %s%s%s.", 1793 selected_method->is_abstract() ? "abstract " : "", 1794 selected_method->is_private() ? "private " : "", 1795 selected_method->name_and_sig_as_C_string()); 1796 } 1797 1798 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string()); 1799 }