1 /* 2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "jvm.h" 27 #include "classfile/defaultMethods.hpp" 28 #include "classfile/javaClasses.hpp" 29 #include "classfile/resolutionErrors.hpp" 30 #include "classfile/symbolTable.hpp" 31 #include "classfile/systemDictionary.hpp" 32 #include "classfile/vmSymbols.hpp" 33 #include "compiler/compileBroker.hpp" 34 #include "gc/shared/collectedHeap.inline.hpp" 35 #include "interpreter/bytecode.hpp" 36 #include "interpreter/interpreterRuntime.hpp" 37 #include "interpreter/linkResolver.hpp" 38 #include "logging/log.hpp" 39 #include "logging/logStream.hpp" 40 #include "memory/resourceArea.hpp" 41 #include "memory/universe.hpp" 42 #include "oops/cpCache.inline.hpp" 43 #include "oops/instanceKlass.hpp" 44 #include "oops/method.hpp" 45 #include "oops/objArrayKlass.hpp" 46 #include "oops/objArrayOop.hpp" 47 #include "oops/oop.inline.hpp" 48 #include "prims/methodHandles.hpp" 49 #include "prims/nativeLookup.hpp" 50 #include "runtime/compilationPolicy.hpp" 51 #include "runtime/fieldDescriptor.hpp" 52 #include "runtime/frame.inline.hpp" 53 #include "runtime/handles.inline.hpp" 54 #include "runtime/reflection.hpp" 55 #include "runtime/safepointVerifiers.hpp" 56 #include "runtime/signature.hpp" 57 #include "runtime/thread.inline.hpp" 58 #include "runtime/vmThread.hpp" 59 60 //------------------------------------------------------------------------------------------------------------------------ 61 // Implementation of CallInfo 62 63 64 void CallInfo::set_static(Klass* resolved_klass, const methodHandle& resolved_method, TRAPS) { 65 int vtable_index = Method::nonvirtual_vtable_index; 66 set_common(resolved_klass, resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK); 67 } 68 69 70 void CallInfo::set_interface(Klass* resolved_klass, 71 Klass* selected_klass, 72 const methodHandle& resolved_method, 73 const methodHandle& selected_method, 74 int itable_index, TRAPS) { 75 // This is only called for interface methods. If the resolved_method 76 // comes from java/lang/Object, it can be the subject of a virtual call, so 77 // we should pick the vtable index from the resolved method. 78 // In that case, the caller must call set_virtual instead of set_interface. 79 assert(resolved_method->method_holder()->is_interface(), ""); 80 assert(itable_index == resolved_method()->itable_index(), ""); 81 set_common(resolved_klass, selected_klass, resolved_method, selected_method, CallInfo::itable_call, itable_index, CHECK); 82 } 83 84 void CallInfo::set_virtual(Klass* resolved_klass, 85 Klass* selected_klass, 86 const methodHandle& resolved_method, 87 const methodHandle& selected_method, 88 int vtable_index, TRAPS) { 89 assert(vtable_index >= 0 || vtable_index == Method::nonvirtual_vtable_index, "valid index"); 90 assert(vtable_index < 0 || !resolved_method->has_vtable_index() || vtable_index == resolved_method->vtable_index(), ""); 91 CallKind kind = (vtable_index >= 0 && !resolved_method->can_be_statically_bound() ? CallInfo::vtable_call : CallInfo::direct_call); 92 set_common(resolved_klass, selected_klass, resolved_method, selected_method, kind, vtable_index, CHECK); 93 assert(!resolved_method->is_compiled_lambda_form(), "these must be handled via an invokehandle call"); 94 } 95 96 void CallInfo::set_handle(const methodHandle& resolved_method, 97 Handle resolved_appendix, 98 Handle resolved_method_type, TRAPS) { 99 set_handle(SystemDictionary::MethodHandle_klass(), resolved_method, resolved_appendix, resolved_method_type, CHECK); 100 } 101 102 void CallInfo::set_handle(Klass* resolved_klass, 103 const methodHandle& resolved_method, 104 Handle resolved_appendix, 105 Handle resolved_method_type, TRAPS) { 106 if (resolved_method.is_null()) { 107 THROW_MSG(vmSymbols::java_lang_InternalError(), "resolved method is null"); 108 } 109 assert(resolved_method->intrinsic_id() == vmIntrinsics::_invokeBasic || 110 resolved_method->is_compiled_lambda_form(), 111 "linkMethod must return one of these"); 112 int vtable_index = Method::nonvirtual_vtable_index; 113 assert(!resolved_method->has_vtable_index(), ""); 114 set_common(resolved_klass, resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK); 115 _resolved_appendix = resolved_appendix; 116 _resolved_method_type = resolved_method_type; 117 } 118 119 void CallInfo::set_common(Klass* resolved_klass, 120 Klass* selected_klass, 121 const methodHandle& resolved_method, 122 const methodHandle& selected_method, 123 CallKind kind, 124 int index, 125 TRAPS) { 126 assert(resolved_method->signature() == selected_method->signature(), "signatures must correspond"); 127 _resolved_klass = resolved_klass; 128 _selected_klass = selected_klass; 129 _resolved_method = resolved_method; 130 _selected_method = selected_method; 131 _call_kind = kind; 132 _call_index = index; 133 _resolved_appendix = Handle(); 134 DEBUG_ONLY(verify()); // verify before making side effects 135 136 CompilationPolicy::compile_if_required(selected_method, THREAD); 137 } 138 139 // utility query for unreflecting a method 140 CallInfo::CallInfo(Method* resolved_method, Klass* resolved_klass, TRAPS) { 141 Klass* resolved_method_holder = resolved_method->method_holder(); 142 if (resolved_klass == NULL) { // 2nd argument defaults to holder of 1st 143 resolved_klass = resolved_method_holder; 144 } 145 _resolved_klass = resolved_klass; 146 _selected_klass = resolved_klass; 147 _resolved_method = resolved_method; 148 _selected_method = resolved_method; 149 // classify: 150 CallKind kind = CallInfo::unknown_kind; 151 int index = resolved_method->vtable_index(); 152 if (resolved_method->can_be_statically_bound()) { 153 kind = CallInfo::direct_call; 154 } else if (!resolved_method_holder->is_interface()) { 155 // Could be an Object method inherited into an interface, but still a vtable call. 156 kind = CallInfo::vtable_call; 157 } else if (!resolved_klass->is_interface()) { 158 // A default or miranda method. Compute the vtable index. 159 index = LinkResolver::vtable_index_of_interface_method(resolved_klass, 160 resolved_method); 161 assert(index >= 0 , "we should have valid vtable index at this point"); 162 163 kind = CallInfo::vtable_call; 164 } else if (resolved_method->has_vtable_index()) { 165 // Can occur if an interface redeclares a method of Object. 166 167 #ifdef ASSERT 168 // Ensure that this is really the case. 169 Klass* object_klass = SystemDictionary::Object_klass(); 170 Method * object_resolved_method = object_klass->vtable().method_at(index); 171 assert(object_resolved_method->name() == resolved_method->name(), 172 "Object and interface method names should match at vtable index %d, %s != %s", 173 index, object_resolved_method->name()->as_C_string(), resolved_method->name()->as_C_string()); 174 assert(object_resolved_method->signature() == resolved_method->signature(), 175 "Object and interface method signatures should match at vtable index %d, %s != %s", 176 index, object_resolved_method->signature()->as_C_string(), resolved_method->signature()->as_C_string()); 177 #endif // ASSERT 178 179 kind = CallInfo::vtable_call; 180 } else { 181 // A regular interface call. 182 kind = CallInfo::itable_call; 183 index = resolved_method->itable_index(); 184 } 185 assert(index == Method::nonvirtual_vtable_index || index >= 0, "bad index %d", index); 186 _call_kind = kind; 187 _call_index = index; 188 _resolved_appendix = Handle(); 189 // Find or create a ResolvedMethod instance for this Method* 190 set_resolved_method_name(CHECK); 191 192 DEBUG_ONLY(verify()); 193 } 194 195 void CallInfo::set_resolved_method_name(TRAPS) { 196 Method* m = _resolved_method(); 197 assert(m != NULL, "Should already have a Method*"); 198 oop rmethod_name = java_lang_invoke_ResolvedMethodName::find_resolved_method(m, CHECK); 199 _resolved_method_name = Handle(THREAD, rmethod_name); 200 } 201 202 #ifdef ASSERT 203 void CallInfo::verify() { 204 switch (call_kind()) { // the meaning and allowed value of index depends on kind 205 case CallInfo::direct_call: 206 if (_call_index == Method::nonvirtual_vtable_index) break; 207 // else fall through to check vtable index: 208 case CallInfo::vtable_call: 209 assert(resolved_klass()->verify_vtable_index(_call_index), ""); 210 break; 211 case CallInfo::itable_call: 212 assert(resolved_method()->method_holder()->verify_itable_index(_call_index), ""); 213 break; 214 case CallInfo::unknown_kind: 215 assert(call_kind() != CallInfo::unknown_kind, "CallInfo must be set"); 216 break; 217 default: 218 fatal("Unexpected call kind %d", call_kind()); 219 } 220 } 221 #endif //ASSERT 222 223 #ifndef PRODUCT 224 void CallInfo::print() { 225 ResourceMark rm; 226 const char* kindstr; 227 switch (_call_kind) { 228 case direct_call: kindstr = "direct"; break; 229 case vtable_call: kindstr = "vtable"; break; 230 case itable_call: kindstr = "itable"; break; 231 default : kindstr = "unknown"; break; 232 } 233 tty->print_cr("Call %s@%d %s", kindstr, _call_index, 234 _resolved_method.is_null() ? "(none)" : _resolved_method->name_and_sig_as_C_string()); 235 } 236 #endif 237 238 //------------------------------------------------------------------------------------------------------------------------ 239 // Implementation of LinkInfo 240 241 LinkInfo::LinkInfo(const constantPoolHandle& pool, int index, const methodHandle& current_method, TRAPS) { 242 // resolve klass 243 _resolved_klass = pool->klass_ref_at(index, CHECK); 244 245 // Get name, signature, and static klass 246 _name = pool->name_ref_at(index); 247 _signature = pool->signature_ref_at(index); 248 _tag = pool->tag_ref_at(index); 249 _current_klass = pool->pool_holder(); 250 _current_method = current_method; 251 252 // Coming from the constant pool always checks access 253 _check_access = true; 254 } 255 256 LinkInfo::LinkInfo(const constantPoolHandle& pool, int index, TRAPS) { 257 // resolve klass 258 _resolved_klass = pool->klass_ref_at(index, CHECK); 259 260 // Get name, signature, and static klass 261 _name = pool->name_ref_at(index); 262 _signature = pool->signature_ref_at(index); 263 _tag = pool->tag_ref_at(index); 264 _current_klass = pool->pool_holder(); 265 _current_method = methodHandle(); 266 267 // Coming from the constant pool always checks access 268 _check_access = true; 269 } 270 271 char* LinkInfo::method_string() const { 272 return Method::name_and_sig_as_C_string(_resolved_klass, _name, _signature); 273 } 274 275 #ifndef PRODUCT 276 void LinkInfo::print() { 277 ResourceMark rm; 278 tty->print_cr("Link resolved_klass=%s name=%s signature=%s current_klass=%s check_access=%s", 279 _resolved_klass->name()->as_C_string(), 280 _name->as_C_string(), 281 _signature->as_C_string(), 282 _current_klass == NULL ? "(none)" : _current_klass->name()->as_C_string(), 283 _check_access ? "true" : "false"); 284 } 285 #endif // PRODUCT 286 //------------------------------------------------------------------------------------------------------------------------ 287 // Klass resolution 288 289 void LinkResolver::check_klass_accessability(Klass* ref_klass, Klass* sel_klass, 290 bool fold_type_to_class, TRAPS) { 291 Klass* base_klass = sel_klass; 292 if (fold_type_to_class) { 293 if (sel_klass->is_objArray_klass()) { 294 base_klass = ObjArrayKlass::cast(sel_klass)->bottom_klass(); 295 } 296 // The element type could be a typeArray - we only need the access 297 // check if it is an reference to another class. 298 if (!base_klass->is_instance_klass()) { 299 return; // no relevant check to do 300 } 301 } 302 Reflection::VerifyClassAccessResults vca_result = 303 Reflection::verify_class_access(ref_klass, InstanceKlass::cast(base_klass), true); 304 if (vca_result != Reflection::ACCESS_OK) { 305 ResourceMark rm(THREAD); 306 char* msg = Reflection::verify_class_access_msg(ref_klass, 307 InstanceKlass::cast(base_klass), 308 vca_result); 309 if (msg == NULL) { 310 Exceptions::fthrow( 311 THREAD_AND_LOCATION, 312 vmSymbols::java_lang_IllegalAccessError(), 313 "failed to access class %s from class %s", 314 base_klass->external_name(), 315 ref_klass->external_name()); 316 } else { 317 // Use module specific message returned by verify_class_access_msg(). 318 Exceptions::fthrow( 319 THREAD_AND_LOCATION, 320 vmSymbols::java_lang_IllegalAccessError(), 321 "%s", msg); 322 } 323 } 324 } 325 326 //------------------------------------------------------------------------------------------------------------------------ 327 // Method resolution 328 // 329 // According to JVM spec. $5.4.3c & $5.4.3d 330 331 // Look up method in klasses, including static methods 332 // Then look up local default methods 333 Method* LinkResolver::lookup_method_in_klasses(const LinkInfo& link_info, 334 bool checkpolymorphism, 335 bool in_imethod_resolve) { 336 NoSafepointVerifier nsv; // Method* returned may not be reclaimed 337 338 Klass* klass = link_info.resolved_klass(); 339 Symbol* name = link_info.name(); 340 Symbol* signature = link_info.signature(); 341 342 // Ignore overpasses so statics can be found during resolution 343 Method* result = klass->uncached_lookup_method(name, signature, Klass::skip_overpass); 344 345 if (klass->is_array_klass()) { 346 // Only consider klass and super klass for arrays 347 return result; 348 } 349 350 InstanceKlass* ik = InstanceKlass::cast(klass); 351 352 // JDK 8, JVMS 5.4.3.4: Interface method resolution should 353 // ignore static and non-public methods of java.lang.Object, 354 // like clone, finalize, registerNatives. 355 if (in_imethod_resolve && 356 result != NULL && 357 ik->is_interface() && 358 (result->is_static() || !result->is_public()) && 359 result->method_holder() == SystemDictionary::Object_klass()) { 360 result = NULL; 361 } 362 363 // Before considering default methods, check for an overpass in the 364 // current class if a method has not been found. 365 if (result == NULL) { 366 result = ik->find_method(name, signature); 367 } 368 369 if (result == NULL) { 370 Array<Method*>* default_methods = ik->default_methods(); 371 if (default_methods != NULL) { 372 result = InstanceKlass::find_method(default_methods, name, signature); 373 } 374 } 375 376 if (checkpolymorphism && result != NULL) { 377 vmIntrinsics::ID iid = result->intrinsic_id(); 378 if (MethodHandles::is_signature_polymorphic(iid)) { 379 // Do not link directly to these. The VM must produce a synthetic one using lookup_polymorphic_method. 380 return NULL; 381 } 382 } 383 return result; 384 } 385 386 // returns first instance method 387 // Looks up method in classes, then looks up local default methods 388 methodHandle LinkResolver::lookup_instance_method_in_klasses(Klass* klass, 389 Symbol* name, 390 Symbol* signature, 391 Klass::PrivateLookupMode private_mode, TRAPS) { 392 Method* result = klass->uncached_lookup_method(name, signature, Klass::find_overpass, private_mode); 393 394 while (result != NULL && result->is_static() && result->method_holder()->super() != NULL) { 395 Klass* super_klass = result->method_holder()->super(); 396 result = super_klass->uncached_lookup_method(name, signature, Klass::find_overpass, private_mode); 397 } 398 399 if (klass->is_array_klass()) { 400 // Only consider klass and super klass for arrays 401 return methodHandle(THREAD, result); 402 } 403 404 if (result == NULL) { 405 Array<Method*>* default_methods = InstanceKlass::cast(klass)->default_methods(); 406 if (default_methods != NULL) { 407 result = InstanceKlass::find_method(default_methods, name, signature); 408 assert(result == NULL || !result->is_static(), "static defaults not allowed"); 409 } 410 } 411 return methodHandle(THREAD, result); 412 } 413 414 int LinkResolver::vtable_index_of_interface_method(Klass* klass, 415 const methodHandle& resolved_method) { 416 417 int vtable_index = Method::invalid_vtable_index; 418 Symbol* name = resolved_method->name(); 419 Symbol* signature = resolved_method->signature(); 420 InstanceKlass* ik = InstanceKlass::cast(klass); 421 422 // First check in default method array 423 if (!resolved_method->is_abstract() && ik->default_methods() != NULL) { 424 int index = InstanceKlass::find_method_index(ik->default_methods(), 425 name, signature, Klass::find_overpass, 426 Klass::find_static, Klass::find_private); 427 if (index >= 0 ) { 428 vtable_index = ik->default_vtable_indices()->at(index); 429 } 430 } 431 if (vtable_index == Method::invalid_vtable_index) { 432 // get vtable_index for miranda methods 433 klassVtable vt = ik->vtable(); 434 vtable_index = vt.index_of_miranda(name, signature); 435 } 436 return vtable_index; 437 } 438 439 Method* LinkResolver::lookup_method_in_interfaces(const LinkInfo& cp_info) { 440 InstanceKlass *ik = InstanceKlass::cast(cp_info.resolved_klass()); 441 442 // Specify 'true' in order to skip default methods when searching the 443 // interfaces. Function lookup_method_in_klasses() already looked for 444 // the method in the default methods table. 445 return ik->lookup_method_in_all_interfaces(cp_info.name(), cp_info.signature(), Klass::skip_defaults); 446 } 447 448 methodHandle LinkResolver::lookup_polymorphic_method( 449 const LinkInfo& link_info, 450 Handle *appendix_result_or_null, 451 Handle *method_type_result, 452 TRAPS) { 453 Klass* klass = link_info.resolved_klass(); 454 Symbol* name = link_info.name(); 455 Symbol* full_signature = link_info.signature(); 456 457 vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name); 458 if (TraceMethodHandles) { 459 ResourceMark rm(THREAD); 460 tty->print_cr("lookup_polymorphic_method iid=%s %s.%s%s", 461 vmIntrinsics::name_at(iid), klass->external_name(), 462 name->as_C_string(), full_signature->as_C_string()); 463 } 464 if ((klass == SystemDictionary::MethodHandle_klass() || 465 klass == SystemDictionary::VarHandle_klass()) && 466 iid != vmIntrinsics::_none) { 467 if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) { 468 // Most of these do not need an up-call to Java to resolve, so can be done anywhere. 469 // Do not erase last argument type (MemberName) if it is a static linkTo method. 470 bool keep_last_arg = MethodHandles::is_signature_polymorphic_static(iid); 471 TempNewSymbol basic_signature = 472 MethodHandles::lookup_basic_type_signature(full_signature, keep_last_arg, CHECK_NULL); 473 if (TraceMethodHandles) { 474 ResourceMark rm(THREAD); 475 tty->print_cr("lookup_polymorphic_method %s %s => basic %s", 476 name->as_C_string(), 477 full_signature->as_C_string(), 478 basic_signature->as_C_string()); 479 } 480 methodHandle result = SystemDictionary::find_method_handle_intrinsic(iid, 481 basic_signature, 482 CHECK_NULL); 483 if (result.not_null()) { 484 assert(result->is_method_handle_intrinsic(), "MH.invokeBasic or MH.linkTo* intrinsic"); 485 assert(result->intrinsic_id() != vmIntrinsics::_invokeGeneric, "wrong place to find this"); 486 assert(basic_signature == result->signature(), "predict the result signature"); 487 if (TraceMethodHandles) { 488 ttyLocker ttyl; 489 tty->print("lookup_polymorphic_method => intrinsic "); 490 result->print_on(tty); 491 } 492 } 493 return result; 494 } else if (iid == vmIntrinsics::_invokeGeneric 495 && THREAD->can_call_java() 496 && appendix_result_or_null != NULL) { 497 // This is a method with type-checking semantics. 498 // We will ask Java code to spin an adapter method for it. 499 if (!MethodHandles::enabled()) { 500 // Make sure the Java part of the runtime has been booted up. 501 Klass* natives = SystemDictionary::MethodHandleNatives_klass(); 502 if (natives == NULL || InstanceKlass::cast(natives)->is_not_initialized()) { 503 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_invoke_MethodHandleNatives(), 504 Handle(), 505 Handle(), 506 true, 507 CHECK_NULL); 508 } 509 } 510 511 Handle appendix; 512 Handle method_type; 513 methodHandle result = SystemDictionary::find_method_handle_invoker( 514 klass, 515 name, 516 full_signature, 517 link_info.current_klass(), 518 &appendix, 519 &method_type, 520 CHECK_NULL); 521 if (TraceMethodHandles) { 522 ttyLocker ttyl; 523 tty->print("lookup_polymorphic_method => (via Java) "); 524 result->print_on(tty); 525 tty->print(" lookup_polymorphic_method => appendix = "); 526 if (appendix.is_null()) tty->print_cr("(none)"); 527 else appendix->print_on(tty); 528 } 529 if (result.not_null()) { 530 #ifdef ASSERT 531 ResourceMark rm(THREAD); 532 533 TempNewSymbol basic_signature = 534 MethodHandles::lookup_basic_type_signature(full_signature, CHECK_NULL); 535 int actual_size_of_params = result->size_of_parameters(); 536 int expected_size_of_params = ArgumentSizeComputer(basic_signature).size(); 537 // +1 for MethodHandle.this, +1 for trailing MethodType 538 if (!MethodHandles::is_signature_polymorphic_static(iid)) expected_size_of_params += 1; 539 if (appendix.not_null()) expected_size_of_params += 1; 540 if (actual_size_of_params != expected_size_of_params) { 541 tty->print_cr("*** basic_signature=%s", basic_signature->as_C_string()); 542 tty->print_cr("*** result for %s: ", vmIntrinsics::name_at(iid)); 543 result->print(); 544 } 545 assert(actual_size_of_params == expected_size_of_params, 546 "%d != %d", actual_size_of_params, expected_size_of_params); 547 #endif //ASSERT 548 549 assert(appendix_result_or_null != NULL, ""); 550 (*appendix_result_or_null) = appendix; 551 (*method_type_result) = method_type; 552 } 553 return result; 554 } 555 } 556 return NULL; 557 } 558 559 void LinkResolver::check_method_accessability(Klass* ref_klass, 560 Klass* resolved_klass, 561 Klass* sel_klass, 562 const methodHandle& sel_method, 563 TRAPS) { 564 565 AccessFlags flags = sel_method->access_flags(); 566 567 // Special case: arrays always override "clone". JVMS 2.15. 568 // If the resolved klass is an array class, and the declaring class 569 // is java.lang.Object and the method is "clone", set the flags 570 // to public. 571 // 572 // We'll check for the method name first, as that's most likely 573 // to be false (so we'll short-circuit out of these tests). 574 if (sel_method->name() == vmSymbols::clone_name() && 575 sel_klass == SystemDictionary::Object_klass() && 576 resolved_klass->is_array_klass()) { 577 // We need to change "protected" to "public". 578 assert(flags.is_protected(), "clone not protected?"); 579 jint new_flags = flags.as_int(); 580 new_flags = new_flags & (~JVM_ACC_PROTECTED); 581 new_flags = new_flags | JVM_ACC_PUBLIC; 582 flags.set_flags(new_flags); 583 } 584 // assert(extra_arg_result_or_null != NULL, "must be able to return extra argument"); 585 586 bool can_access = Reflection::verify_member_access(ref_klass, 587 resolved_klass, 588 sel_klass, 589 flags, 590 true, false, CHECK); 591 // Any existing exceptions that may have been thrown, for example LinkageErrors 592 // from nest-host resolution, have been allowed to propagate. 593 if (!can_access) { 594 ResourceMark rm(THREAD); 595 bool same_module = (sel_klass->module() == ref_klass->module()); 596 Exceptions::fthrow( 597 THREAD_AND_LOCATION, 598 vmSymbols::java_lang_IllegalAccessError(), 599 "class %s tried to access method %s.%s%s (%s%s%s)", 600 ref_klass->external_name(), 601 sel_klass->external_name(), 602 sel_method->name()->as_C_string(), 603 sel_method->signature()->as_C_string(), 604 (same_module) ? ref_klass->joint_in_module_of_loader(sel_klass) : ref_klass->class_in_module_of_loader(), 605 (same_module) ? "" : "; ", 606 (same_module) ? "" : sel_klass->class_in_module_of_loader() 607 ); 608 return; 609 } 610 } 611 612 methodHandle LinkResolver::resolve_method_statically(Bytecodes::Code code, 613 const constantPoolHandle& pool, int index, TRAPS) { 614 // This method is used only 615 // (1) in C2 from InlineTree::ok_to_inline (via ciMethod::check_call), 616 // and 617 // (2) in Bytecode_invoke::static_target 618 // It appears to fail when applied to an invokeinterface call site. 619 // FIXME: Remove this method and ciMethod::check_call; refactor to use the other LinkResolver entry points. 620 // resolve klass 621 if (code == Bytecodes::_invokedynamic) { 622 Klass* resolved_klass = SystemDictionary::MethodHandle_klass(); 623 Symbol* method_name = vmSymbols::invoke_name(); 624 Symbol* method_signature = pool->signature_ref_at(index); 625 Klass* current_klass = pool->pool_holder(); 626 LinkInfo link_info(resolved_klass, method_name, method_signature, current_klass); 627 return resolve_method(link_info, code, THREAD); 628 } 629 630 LinkInfo link_info(pool, index, methodHandle(), CHECK_NULL); 631 Klass* resolved_klass = link_info.resolved_klass(); 632 633 if (pool->has_preresolution() 634 || (resolved_klass == SystemDictionary::MethodHandle_klass() && 635 MethodHandles::is_signature_polymorphic_name(resolved_klass, link_info.name()))) { 636 Method* result = ConstantPool::method_at_if_loaded(pool, index); 637 if (result != NULL) { 638 return methodHandle(THREAD, result); 639 } 640 } 641 642 if (code == Bytecodes::_invokeinterface) { 643 return resolve_interface_method(link_info, code, THREAD); 644 } else if (code == Bytecodes::_invokevirtual) { 645 return resolve_method(link_info, code, THREAD); 646 } else if (!resolved_klass->is_interface()) { 647 return resolve_method(link_info, code, THREAD); 648 } else { 649 return resolve_interface_method(link_info, code, THREAD); 650 } 651 } 652 653 // Check and print a loader constraint violation message for method or interface method 654 void LinkResolver::check_method_loader_constraints(const LinkInfo& link_info, 655 const methodHandle& resolved_method, 656 const char* method_type, TRAPS) { 657 Handle current_loader(THREAD, link_info.current_klass()->class_loader()); 658 Handle resolved_loader(THREAD, resolved_method->method_holder()->class_loader()); 659 660 ResourceMark rm(THREAD); 661 Symbol* failed_type_symbol = 662 SystemDictionary::check_signature_loaders(link_info.signature(), current_loader, 663 resolved_loader, true, CHECK); 664 if (failed_type_symbol != NULL) { 665 Klass* current_class = link_info.current_klass(); 666 ClassLoaderData* current_loader_data = current_class->class_loader_data(); 667 assert(current_loader_data != NULL, "current class has no class loader data"); 668 Klass* resolved_method_class = resolved_method->method_holder(); 669 ClassLoaderData* target_loader_data = resolved_method_class->class_loader_data(); 670 assert(target_loader_data != NULL, "resolved method's class has no class loader data"); 671 672 const char* msg = "loader constraint violation: when resolving %s" 673 " \"%s\" the class loader %s of the current class, %s," 674 " and the class loader %s for the method's defining class, %s, have" 675 " different Class objects for the type %s used in the signature (%s; %s)"; 676 char* sig = link_info.method_string(); 677 const char* loader1_name = current_loader_data->loader_name_and_id(); 678 char* current = current_class->name()->as_C_string(); 679 const char* current_class_description = current_class->class_in_module_of_loader(false,true); 680 const char* loader2_name = target_loader_data->loader_name_and_id(); 681 char* target = resolved_method_class->name()->as_C_string(); 682 const char* target_class_description = resolved_method_class->class_in_module_of_loader(false,true); 683 char* failed_type_name = failed_type_symbol->as_C_string(); 684 size_t buflen = strlen(msg) + strlen(sig) + 685 strlen(loader1_name) + strlen(current) + strlen(current_class_description) + 686 strlen(loader2_name) + strlen(target) + strlen(target_class_description) + 687 strlen(failed_type_name) + strlen(method_type) + 1; 688 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); 689 jio_snprintf(buf, buflen, msg, method_type, sig, loader1_name, current, loader2_name, 690 target, failed_type_name, current_class_description, target_class_description); 691 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); 692 } 693 } 694 695 void LinkResolver::check_field_loader_constraints(Symbol* field, Symbol* sig, 696 Klass* current_klass, 697 Klass* sel_klass, TRAPS) { 698 Handle ref_loader(THREAD, current_klass->class_loader()); 699 Handle sel_loader(THREAD, sel_klass->class_loader()); 700 701 ResourceMark rm(THREAD); // needed for check_signature_loaders 702 Symbol* failed_type_symbol = 703 SystemDictionary::check_signature_loaders(sig, 704 ref_loader, sel_loader, 705 false, 706 CHECK); 707 if (failed_type_symbol != NULL) { 708 const char* msg = "loader constraint violation: when resolving field" 709 " \"%s\" of type %s, the class loader %s of the current class, " 710 "%s, and the class loader %s for the field's defining " 711 "type, %s, have different Class objects for type %s (%s; %s)"; 712 const char* field_name = field->as_C_string(); 713 const char* loader1_name = current_klass->class_loader_data()->loader_name_and_id(); 714 const char* curr_name = current_klass->external_name(); 715 const char* curr_class_description = current_klass->class_in_module_of_loader(false,true); 716 const char* loader2_name = sel_klass->class_loader_data()->loader_name_and_id(); 717 const char* sel_name = sel_klass->external_name(); 718 const char* sel_class_description = sel_klass->class_in_module_of_loader(false,true); 719 const char* failed_type_name = failed_type_symbol->as_klass_external_name(); 720 size_t buflen = strlen(msg) + strlen(field_name) + 2 * strlen(failed_type_name) + 721 strlen(loader1_name) + strlen(curr_name) + strlen(curr_class_description) + 722 strlen(loader2_name) + strlen(sel_name) + strlen(sel_class_description) + 1; 723 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); 724 jio_snprintf(buf, buflen, msg, field_name, failed_type_name, loader1_name, 725 curr_name, loader2_name, sel_name, failed_type_name, 726 curr_class_description, sel_class_description); 727 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); 728 } 729 } 730 731 methodHandle LinkResolver::resolve_method(const LinkInfo& link_info, 732 Bytecodes::Code code, TRAPS) { 733 734 Handle nested_exception; 735 Klass* resolved_klass = link_info.resolved_klass(); 736 737 // 1. For invokevirtual, cannot call an interface method 738 if (code == Bytecodes::_invokevirtual && resolved_klass->is_interface()) { 739 ResourceMark rm(THREAD); 740 char buf[200]; 741 jio_snprintf(buf, sizeof(buf), "Found interface %s, but class was expected", 742 resolved_klass->external_name()); 743 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 744 } 745 746 // 2. check constant pool tag for called method - must be JVM_CONSTANT_Methodref 747 if (!link_info.tag().is_invalid() && !link_info.tag().is_method()) { 748 ResourceMark rm(THREAD); 749 char buf[200]; 750 jio_snprintf(buf, sizeof(buf), "Method %s must be Methodref constant", link_info.method_string()); 751 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 752 } 753 754 // 3. lookup method in resolved klass and its super klasses 755 methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, true, false)); 756 757 // 4. lookup method in all the interfaces implemented by the resolved klass 758 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) { // not found in the class hierarchy 759 resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info)); 760 761 if (resolved_method.is_null()) { 762 // JSR 292: see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc 763 resolved_method = lookup_polymorphic_method(link_info, (Handle*)NULL, (Handle*)NULL, THREAD); 764 if (HAS_PENDING_EXCEPTION) { 765 nested_exception = Handle(THREAD, PENDING_EXCEPTION); 766 CLEAR_PENDING_EXCEPTION; 767 } 768 } 769 } 770 771 // 5. method lookup failed 772 if (resolved_method.is_null()) { 773 ResourceMark rm(THREAD); 774 THROW_MSG_CAUSE_(vmSymbols::java_lang_NoSuchMethodError(), 775 Method::name_and_sig_as_C_string(resolved_klass, 776 link_info.name(), 777 link_info.signature()), 778 nested_exception, NULL); 779 } 780 781 // 6. access checks, access checking may be turned off when calling from within the VM. 782 Klass* current_klass = link_info.current_klass(); 783 if (link_info.check_access()) { 784 assert(current_klass != NULL , "current_klass should not be null"); 785 786 // check if method can be accessed by the referring class 787 check_method_accessability(current_klass, 788 resolved_klass, 789 resolved_method->method_holder(), 790 resolved_method, 791 CHECK_NULL); 792 793 // check loader constraints 794 check_method_loader_constraints(link_info, resolved_method, "method", CHECK_NULL); 795 } 796 797 // For private method invocation we should only find the method in the resolved class. 798 // If that is not the case then we have a found a supertype method that we have nestmate 799 // access to. 800 if (resolved_method->is_private() && resolved_method->method_holder() != resolved_klass) { 801 ResourceMark rm(THREAD); 802 DEBUG_ONLY(bool is_nestmate = InstanceKlass::cast(link_info.current_klass())->has_nestmate_access_to(InstanceKlass::cast(resolved_klass), THREAD);) 803 assert(is_nestmate, "was only expecting nestmates to get here!"); 804 Exceptions::fthrow( 805 THREAD_AND_LOCATION, 806 vmSymbols::java_lang_NoSuchMethodError(), 807 "%s: method %s%s not found", 808 resolved_klass->external_name(), 809 resolved_method->name()->as_C_string(), 810 resolved_method->signature()->as_C_string() 811 ); 812 return NULL; 813 } 814 815 return resolved_method; 816 } 817 818 static void trace_method_resolution(const char* prefix, 819 Klass* klass, 820 Klass* resolved_klass, 821 const methodHandle& method, 822 bool logitables, 823 int index = -1) { 824 #ifndef PRODUCT 825 ResourceMark rm; 826 Log(itables) logi; 827 LogStream lsi(logi.trace()); 828 Log(vtables) logv; 829 LogStream lsv(logv.trace()); 830 outputStream* st; 831 if (logitables) { 832 st = &lsi; 833 } else { 834 st = &lsv; 835 } 836 st->print("%s%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ", 837 prefix, 838 (klass == NULL ? "<NULL>" : klass->internal_name()), 839 (resolved_klass == NULL ? "<NULL>" : resolved_klass->internal_name()), 840 Method::name_and_sig_as_C_string(resolved_klass, 841 method->name(), 842 method->signature()), 843 method->method_holder()->internal_name()); 844 method->print_linkage_flags(st); 845 if (index != -1) { 846 st->print("vtable_index:%d", index); 847 } 848 st->cr(); 849 #endif // PRODUCT 850 } 851 852 // Do linktime resolution of a method in the interface within the context of the specied bytecode. 853 methodHandle LinkResolver::resolve_interface_method(const LinkInfo& link_info, Bytecodes::Code code, TRAPS) { 854 855 Klass* resolved_klass = link_info.resolved_klass(); 856 857 // check if klass is interface 858 if (!resolved_klass->is_interface()) { 859 ResourceMark rm(THREAD); 860 char buf[200]; 861 jio_snprintf(buf, sizeof(buf), "Found class %s, but interface was expected", resolved_klass->external_name()); 862 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 863 } 864 865 // check constant pool tag for called method - must be JVM_CONSTANT_InterfaceMethodref 866 if (!link_info.tag().is_invalid() && !link_info.tag().is_interface_method()) { 867 ResourceMark rm(THREAD); 868 char buf[200]; 869 jio_snprintf(buf, sizeof(buf), "Method %s must be InterfaceMethodref constant", link_info.method_string()); 870 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 871 } 872 873 // lookup method in this interface or its super, java.lang.Object 874 // JDK8: also look for static methods 875 methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, false, true)); 876 877 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) { 878 // lookup method in all the super-interfaces 879 resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info)); 880 } 881 882 if (resolved_method.is_null()) { 883 // no method found 884 ResourceMark rm(THREAD); 885 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), 886 Method::name_and_sig_as_C_string(resolved_klass, 887 link_info.name(), 888 link_info.signature())); 889 } 890 891 if (link_info.check_access()) { 892 // JDK8 adds non-public interface methods, and accessability check requirement 893 Klass* current_klass = link_info.current_klass(); 894 895 assert(current_klass != NULL , "current_klass should not be null"); 896 897 // check if method can be accessed by the referring class 898 check_method_accessability(current_klass, 899 resolved_klass, 900 resolved_method->method_holder(), 901 resolved_method, 902 CHECK_NULL); 903 904 check_method_loader_constraints(link_info, resolved_method, "interface method", CHECK_NULL); 905 } 906 907 if (code != Bytecodes::_invokestatic && resolved_method->is_static()) { 908 ResourceMark rm(THREAD); 909 char buf[200]; 910 jio_snprintf(buf, sizeof(buf), "Expected instance not static method %s", 911 Method::name_and_sig_as_C_string(resolved_klass, 912 resolved_method->name(), resolved_method->signature())); 913 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 914 } 915 916 if (log_develop_is_enabled(Trace, itables)) { 917 char buf[200]; 918 jio_snprintf(buf, sizeof(buf), "%s resolved interface method: caller-class:", 919 Bytecodes::name(code)); 920 trace_method_resolution(buf, link_info.current_klass(), resolved_klass, 921 resolved_method, true); 922 } 923 924 return resolved_method; 925 } 926 927 //------------------------------------------------------------------------------------------------------------------------ 928 // Field resolution 929 930 void LinkResolver::check_field_accessability(Klass* ref_klass, 931 Klass* resolved_klass, 932 Klass* sel_klass, 933 const fieldDescriptor& fd, 934 TRAPS) { 935 bool can_access = Reflection::verify_member_access(ref_klass, 936 resolved_klass, 937 sel_klass, 938 fd.access_flags(), 939 true, false, CHECK); 940 // Any existing exceptions that may have been thrown, for example LinkageErrors 941 // from nest-host resolution, have been allowed to propagate. 942 if (!can_access) { 943 ResourceMark rm(THREAD); 944 Exceptions::fthrow( 945 THREAD_AND_LOCATION, 946 vmSymbols::java_lang_IllegalAccessError(), 947 "tried to access field %s.%s from class %s", 948 sel_klass->external_name(), 949 fd.name()->as_C_string(), 950 ref_klass->external_name() 951 ); 952 return; 953 } 954 } 955 956 void LinkResolver::resolve_field_access(fieldDescriptor& fd, const constantPoolHandle& pool, int index, const methodHandle& method, Bytecodes::Code byte, TRAPS) { 957 LinkInfo link_info(pool, index, method, CHECK); 958 resolve_field(fd, link_info, byte, true, CHECK); 959 } 960 961 void LinkResolver::resolve_field(fieldDescriptor& fd, 962 const LinkInfo& link_info, 963 Bytecodes::Code byte, bool initialize_class, 964 TRAPS) { 965 assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic || 966 byte == Bytecodes::_getfield || byte == Bytecodes::_putfield || 967 byte == Bytecodes::_nofast_getfield || byte == Bytecodes::_nofast_putfield || 968 (byte == Bytecodes::_nop && !link_info.check_access()), "bad field access bytecode"); 969 970 bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic); 971 bool is_put = (byte == Bytecodes::_putfield || byte == Bytecodes::_putstatic || byte == Bytecodes::_nofast_putfield); 972 // Check if there's a resolved klass containing the field 973 Klass* resolved_klass = link_info.resolved_klass(); 974 Symbol* field = link_info.name(); 975 Symbol* sig = link_info.signature(); 976 977 if (resolved_klass == NULL) { 978 ResourceMark rm(THREAD); 979 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string()); 980 } 981 982 // Resolve instance field 983 Klass* sel_klass = resolved_klass->find_field(field, sig, &fd); 984 // check if field exists; i.e., if a klass containing the field def has been selected 985 if (sel_klass == NULL) { 986 ResourceMark rm(THREAD); 987 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string()); 988 } 989 990 if (!link_info.check_access()) 991 // Access checking may be turned off when calling from within the VM. 992 return; 993 994 // check access 995 Klass* current_klass = link_info.current_klass(); 996 check_field_accessability(current_klass, resolved_klass, sel_klass, fd, CHECK); 997 998 // check for errors 999 if (is_static != fd.is_static()) { 1000 ResourceMark rm(THREAD); 1001 char msg[200]; 1002 jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string()); 1003 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg); 1004 } 1005 1006 // A final field can be modified only 1007 // (1) by methods declared in the class declaring the field and 1008 // (2) by the <clinit> method (in case of a static field) 1009 // or by the <init> method (in case of an instance field). 1010 if (is_put && fd.access_flags().is_final()) { 1011 ResourceMark rm(THREAD); 1012 stringStream ss; 1013 1014 if (sel_klass != current_klass) { 1015 ss.print("Update to %s final field %s.%s attempted from a different class (%s) than the field's declaring class", 1016 is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(), 1017 current_klass->external_name()); 1018 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string()); 1019 } 1020 1021 if (fd.constants()->pool_holder()->major_version() >= 53) { 1022 methodHandle m = link_info.current_method(); 1023 assert(!m.is_null(), "information about the current method must be available for 'put' bytecodes"); 1024 bool is_initialized_static_final_update = (byte == Bytecodes::_putstatic && 1025 fd.is_static() && 1026 !m()->is_static_initializer()); 1027 bool is_initialized_instance_final_update = ((byte == Bytecodes::_putfield || byte == Bytecodes::_nofast_putfield) && 1028 !fd.is_static() && 1029 !m->is_object_initializer()); 1030 1031 if (is_initialized_static_final_update || is_initialized_instance_final_update) { 1032 ss.print("Update to %s final field %s.%s attempted from a different method (%s) than the initializer method %s ", 1033 is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(), 1034 m()->name()->as_C_string(), 1035 is_static ? "<clinit>" : "<init>"); 1036 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string()); 1037 } 1038 } 1039 } 1040 1041 // initialize resolved_klass if necessary 1042 // note 1: the klass which declared the field must be initialized (i.e, sel_klass) 1043 // according to the newest JVM spec (5.5, p.170) - was bug (gri 7/28/99) 1044 // 1045 // note 2: we don't want to force initialization if we are just checking 1046 // if the field access is legal; e.g., during compilation 1047 if (is_static && initialize_class) { 1048 sel_klass->initialize(CHECK); 1049 } 1050 1051 if (sel_klass != current_klass) { 1052 check_field_loader_constraints(field, sig, current_klass, sel_klass, CHECK); 1053 } 1054 1055 // return information. note that the klass is set to the actual klass containing the 1056 // field, otherwise access of static fields in superclasses will not work. 1057 } 1058 1059 1060 //------------------------------------------------------------------------------------------------------------------------ 1061 // Invoke resolution 1062 // 1063 // Naming conventions: 1064 // 1065 // resolved_method the specified method (i.e., static receiver specified via constant pool index) 1066 // sel_method the selected method (selected via run-time lookup; e.g., based on dynamic receiver class) 1067 // resolved_klass the specified klass (i.e., specified via constant pool index) 1068 // recv_klass the receiver klass 1069 1070 1071 void LinkResolver::resolve_static_call(CallInfo& result, 1072 const LinkInfo& link_info, 1073 bool initialize_class, TRAPS) { 1074 methodHandle resolved_method = linktime_resolve_static_method(link_info, CHECK); 1075 1076 // The resolved class can change as a result of this resolution. 1077 Klass* resolved_klass = resolved_method->method_holder(); 1078 1079 // Initialize klass (this should only happen if everything is ok) 1080 if (initialize_class && resolved_klass->should_be_initialized()) { 1081 resolved_klass->initialize(CHECK); 1082 // Use updated LinkInfo to reresolve with resolved method holder 1083 LinkInfo new_info(resolved_klass, link_info.name(), link_info.signature(), 1084 link_info.current_klass(), 1085 link_info.check_access() ? LinkInfo::needs_access_check : LinkInfo::skip_access_check); 1086 resolved_method = linktime_resolve_static_method(new_info, CHECK); 1087 } 1088 1089 // setup result 1090 result.set_static(resolved_klass, resolved_method, CHECK); 1091 } 1092 1093 // throws linktime exceptions 1094 methodHandle LinkResolver::linktime_resolve_static_method(const LinkInfo& link_info, TRAPS) { 1095 1096 Klass* resolved_klass = link_info.resolved_klass(); 1097 methodHandle resolved_method; 1098 if (!resolved_klass->is_interface()) { 1099 resolved_method = resolve_method(link_info, Bytecodes::_invokestatic, CHECK_NULL); 1100 } else { 1101 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokestatic, CHECK_NULL); 1102 } 1103 assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier"); 1104 1105 // check if static 1106 if (!resolved_method->is_static()) { 1107 ResourceMark rm(THREAD); 1108 char buf[200]; 1109 jio_snprintf(buf, sizeof(buf), "Expected static method %s", Method::name_and_sig_as_C_string(resolved_klass, 1110 resolved_method->name(), 1111 resolved_method->signature())); 1112 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1113 } 1114 return resolved_method; 1115 } 1116 1117 1118 void LinkResolver::resolve_special_call(CallInfo& result, 1119 Handle recv, 1120 const LinkInfo& link_info, 1121 TRAPS) { 1122 methodHandle resolved_method = linktime_resolve_special_method(link_info, CHECK); 1123 runtime_resolve_special_method(result, link_info, resolved_method, recv, CHECK); 1124 } 1125 1126 // throws linktime exceptions 1127 methodHandle LinkResolver::linktime_resolve_special_method(const LinkInfo& link_info, 1128 TRAPS) { 1129 1130 // Invokespecial is called for multiple special reasons: 1131 // <init> 1132 // local private method invocation, for classes and interfaces 1133 // superclass.method, which can also resolve to a default method 1134 // and the selected method is recalculated relative to the direct superclass 1135 // superinterface.method, which explicitly does not check shadowing 1136 Klass* resolved_klass = link_info.resolved_klass(); 1137 methodHandle resolved_method; 1138 1139 if (!resolved_klass->is_interface()) { 1140 resolved_method = resolve_method(link_info, Bytecodes::_invokespecial, CHECK_NULL); 1141 } else { 1142 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokespecial, CHECK_NULL); 1143 } 1144 1145 // check if method name is <init>, that it is found in same klass as static type 1146 if (resolved_method->name() == vmSymbols::object_initializer_name() && 1147 resolved_method->method_holder() != resolved_klass) { 1148 ResourceMark rm(THREAD); 1149 Exceptions::fthrow( 1150 THREAD_AND_LOCATION, 1151 vmSymbols::java_lang_NoSuchMethodError(), 1152 "%s: method %s%s not found", 1153 resolved_klass->external_name(), 1154 resolved_method->name()->as_C_string(), 1155 resolved_method->signature()->as_C_string() 1156 ); 1157 return NULL; 1158 } 1159 1160 // ensure that invokespecial's interface method reference is in 1161 // a direct superinterface, not an indirect superinterface 1162 Klass* current_klass = link_info.current_klass(); 1163 if (current_klass != NULL && resolved_klass->is_interface()) { 1164 InstanceKlass* ck = InstanceKlass::cast(current_klass); 1165 InstanceKlass *klass_to_check = !ck->is_anonymous() ? 1166 ck : 1167 InstanceKlass::cast(ck->host_klass()); 1168 // Disable verification for the dynamically-generated reflection bytecodes. 1169 bool is_reflect = klass_to_check->is_subclass_of( 1170 SystemDictionary::reflect_MagicAccessorImpl_klass()); 1171 1172 if (!is_reflect && 1173 !klass_to_check->is_same_or_direct_interface(resolved_klass)) { 1174 ResourceMark rm(THREAD); 1175 char buf[200]; 1176 jio_snprintf(buf, sizeof(buf), 1177 "Interface method reference: %s, is in an indirect superinterface of %s", 1178 Method::name_and_sig_as_C_string(resolved_klass, 1179 resolved_method->name(), 1180 resolved_method->signature()), 1181 current_klass->external_name()); 1182 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1183 } 1184 } 1185 1186 // check if not static 1187 if (resolved_method->is_static()) { 1188 ResourceMark rm(THREAD); 1189 char buf[200]; 1190 jio_snprintf(buf, sizeof(buf), 1191 "Expecting non-static method %s", 1192 Method::name_and_sig_as_C_string(resolved_klass, 1193 resolved_method->name(), 1194 resolved_method->signature())); 1195 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1196 } 1197 1198 if (log_develop_is_enabled(Trace, itables)) { 1199 trace_method_resolution("invokespecial resolved method: caller-class:", 1200 current_klass, resolved_klass, resolved_method, true); 1201 } 1202 1203 return resolved_method; 1204 } 1205 1206 // throws runtime exceptions 1207 void LinkResolver::runtime_resolve_special_method(CallInfo& result, 1208 const LinkInfo& link_info, 1209 const methodHandle& resolved_method, 1210 Handle recv, TRAPS) { 1211 1212 Klass* resolved_klass = link_info.resolved_klass(); 1213 1214 // resolved method is selected method unless we have an old-style lookup 1215 // for a superclass method 1216 // Invokespecial for a superinterface, resolved method is selected method, 1217 // no checks for shadowing 1218 methodHandle sel_method(THREAD, resolved_method()); 1219 1220 if (link_info.check_access() && 1221 // check if the method is not <init> 1222 resolved_method->name() != vmSymbols::object_initializer_name()) { 1223 1224 // check if this is an old-style super call and do a new lookup if so 1225 // a) check if ACC_SUPER flag is set for the current class 1226 Klass* current_klass = link_info.current_klass(); 1227 if ((current_klass->is_super() || !AllowNonVirtualCalls) && 1228 // b) check if the class of the resolved_klass is a superclass 1229 // (not supertype in order to exclude interface classes) of the current class. 1230 // This check is not performed for super.invoke for interface methods 1231 // in super interfaces. 1232 current_klass->is_subclass_of(resolved_klass) && 1233 current_klass != resolved_klass 1234 ) { 1235 // Lookup super method 1236 Klass* super_klass = current_klass->super(); 1237 sel_method = lookup_instance_method_in_klasses(super_klass, 1238 resolved_method->name(), 1239 resolved_method->signature(), 1240 Klass::find_private, CHECK); 1241 // check if found 1242 if (sel_method.is_null()) { 1243 ResourceMark rm(THREAD); 1244 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), 1245 Method::name_and_sig_as_C_string(resolved_klass, 1246 resolved_method->name(), 1247 resolved_method->signature())); 1248 // check loader constraints if found a different method 1249 } else if (sel_method() != resolved_method()) { 1250 check_method_loader_constraints(link_info, sel_method, "method", CHECK); 1251 } 1252 } 1253 1254 // Check that the class of objectref (the receiver) is the current class or interface, 1255 // or a subtype of the current class or interface (the sender), otherwise invokespecial 1256 // throws IllegalAccessError. 1257 // The verifier checks that the sender is a subtype of the class in the I/MR operand. 1258 // The verifier also checks that the receiver is a subtype of the sender, if the sender is 1259 // a class. If the sender is an interface, the check has to be performed at runtime. 1260 InstanceKlass* sender = InstanceKlass::cast(current_klass); 1261 sender = sender->is_anonymous() ? sender->host_klass() : sender; 1262 if (sender->is_interface() && recv.not_null()) { 1263 Klass* receiver_klass = recv->klass(); 1264 if (!receiver_klass->is_subtype_of(sender)) { 1265 ResourceMark rm(THREAD); 1266 char buf[500]; 1267 jio_snprintf(buf, sizeof(buf), 1268 "Receiver class %s must be the current class or a subtype of interface %s", 1269 receiver_klass->name()->as_C_string(), 1270 sender->name()->as_C_string()); 1271 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), buf); 1272 } 1273 } 1274 } 1275 1276 // check if not static 1277 if (sel_method->is_static()) { 1278 ResourceMark rm(THREAD); 1279 char buf[200]; 1280 jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass, 1281 resolved_method->name(), 1282 resolved_method->signature())); 1283 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1284 } 1285 1286 // check if abstract 1287 if (sel_method->is_abstract()) { 1288 ResourceMark rm(THREAD); 1289 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), 1290 Method::name_and_sig_as_C_string(resolved_klass, 1291 sel_method->name(), 1292 sel_method->signature())); 1293 } 1294 1295 if (log_develop_is_enabled(Trace, itables)) { 1296 trace_method_resolution("invokespecial selected method: resolved-class:", 1297 resolved_klass, resolved_klass, sel_method, true); 1298 } 1299 1300 // setup result 1301 result.set_static(resolved_klass, sel_method, CHECK); 1302 } 1303 1304 void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, Klass* receiver_klass, 1305 const LinkInfo& link_info, 1306 bool check_null_and_abstract, TRAPS) { 1307 methodHandle resolved_method = linktime_resolve_virtual_method(link_info, CHECK); 1308 runtime_resolve_virtual_method(result, resolved_method, 1309 link_info.resolved_klass(), 1310 recv, receiver_klass, 1311 check_null_and_abstract, CHECK); 1312 } 1313 1314 // throws linktime exceptions 1315 methodHandle LinkResolver::linktime_resolve_virtual_method(const LinkInfo& link_info, 1316 TRAPS) { 1317 // normal method resolution 1318 methodHandle resolved_method = resolve_method(link_info, Bytecodes::_invokevirtual, CHECK_NULL); 1319 1320 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier"); 1321 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier"); 1322 1323 // check if private interface method 1324 Klass* resolved_klass = link_info.resolved_klass(); 1325 Klass* current_klass = link_info.current_klass(); 1326 1327 // This is impossible, if resolve_klass is an interface, we've thrown icce in resolve_method 1328 if (resolved_klass->is_interface() && resolved_method->is_private()) { 1329 ResourceMark rm(THREAD); 1330 char buf[200]; 1331 jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokevirtual: method %s, caller-class:%s", 1332 Method::name_and_sig_as_C_string(resolved_klass, 1333 resolved_method->name(), 1334 resolved_method->signature()), 1335 (current_klass == NULL ? "<NULL>" : current_klass->internal_name())); 1336 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1337 } 1338 1339 // check if not static 1340 if (resolved_method->is_static()) { 1341 ResourceMark rm(THREAD); 1342 char buf[200]; 1343 jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass, 1344 resolved_method->name(), 1345 resolved_method->signature())); 1346 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1347 } 1348 1349 if (log_develop_is_enabled(Trace, vtables)) { 1350 trace_method_resolution("invokevirtual resolved method: caller-class:", 1351 current_klass, resolved_klass, resolved_method, false); 1352 } 1353 1354 return resolved_method; 1355 } 1356 1357 // throws runtime exceptions 1358 void LinkResolver::runtime_resolve_virtual_method(CallInfo& result, 1359 const methodHandle& resolved_method, 1360 Klass* resolved_klass, 1361 Handle recv, 1362 Klass* recv_klass, 1363 bool check_null_and_abstract, 1364 TRAPS) { 1365 1366 // setup default return values 1367 int vtable_index = Method::invalid_vtable_index; 1368 methodHandle selected_method; 1369 1370 // runtime method resolution 1371 if (check_null_and_abstract && recv.is_null()) { // check if receiver exists 1372 THROW(vmSymbols::java_lang_NullPointerException()); 1373 } 1374 1375 // Virtual methods cannot be resolved before its klass has been linked, for otherwise the Method*'s 1376 // has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since 1377 // a missing receiver might result in a bogus lookup. 1378 assert(resolved_method->method_holder()->is_linked(), "must be linked"); 1379 1380 // do lookup based on receiver klass using the vtable index 1381 if (resolved_method->method_holder()->is_interface()) { // default or miranda method 1382 vtable_index = vtable_index_of_interface_method(resolved_klass, resolved_method); 1383 assert(vtable_index >= 0 , "we should have valid vtable index at this point"); 1384 1385 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index)); 1386 } else { 1387 // at this point we are sure that resolved_method is virtual and not 1388 // a default or miranda method; therefore, it must have a valid vtable index. 1389 assert(!resolved_method->has_itable_index(), ""); 1390 vtable_index = resolved_method->vtable_index(); 1391 // We could get a negative vtable_index of nonvirtual_vtable_index for private 1392 // methods, or for final methods. Private methods never appear in the vtable 1393 // and never override other methods. As an optimization, final methods are 1394 // never put in the vtable, unless they override an existing method. 1395 // So if we do get nonvirtual_vtable_index, it means the selected method is the 1396 // resolved method, and it can never be changed by an override. 1397 if (vtable_index == Method::nonvirtual_vtable_index) { 1398 assert(resolved_method->can_be_statically_bound(), "cannot override this method"); 1399 selected_method = resolved_method; 1400 } else { 1401 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index)); 1402 } 1403 } 1404 1405 // check if method exists 1406 if (selected_method.is_null()) { 1407 throw_abstract_method_error(resolved_method, recv_klass, CHECK); 1408 } 1409 1410 // check if abstract 1411 if (check_null_and_abstract && selected_method->is_abstract()) { 1412 // Pass arguments for generating a verbose error message. 1413 throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK); 1414 } 1415 1416 if (log_develop_is_enabled(Trace, vtables)) { 1417 trace_method_resolution("invokevirtual selected method: receiver-class:", 1418 recv_klass, resolved_klass, selected_method, 1419 false, vtable_index); 1420 } 1421 // setup result 1422 result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK); 1423 } 1424 1425 void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, Klass* recv_klass, 1426 const LinkInfo& link_info, 1427 bool check_null_and_abstract, TRAPS) { 1428 // throws linktime exceptions 1429 methodHandle resolved_method = linktime_resolve_interface_method(link_info, CHECK); 1430 runtime_resolve_interface_method(result, resolved_method,link_info.resolved_klass(), 1431 recv, recv_klass, check_null_and_abstract, CHECK); 1432 } 1433 1434 methodHandle LinkResolver::linktime_resolve_interface_method(const LinkInfo& link_info, 1435 TRAPS) { 1436 // normal interface method resolution 1437 methodHandle resolved_method = resolve_interface_method(link_info, Bytecodes::_invokeinterface, CHECK_NULL); 1438 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier"); 1439 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier"); 1440 1441 return resolved_method; 1442 } 1443 1444 // throws runtime exceptions 1445 void LinkResolver::runtime_resolve_interface_method(CallInfo& result, 1446 const methodHandle& resolved_method, 1447 Klass* resolved_klass, 1448 Handle recv, 1449 Klass* recv_klass, 1450 bool check_null_and_abstract, TRAPS) { 1451 1452 // check if receiver exists 1453 if (check_null_and_abstract && recv.is_null()) { 1454 THROW(vmSymbols::java_lang_NullPointerException()); 1455 } 1456 1457 // check if receiver klass implements the resolved interface 1458 if (!recv_klass->is_subtype_of(resolved_klass)) { 1459 ResourceMark rm(THREAD); 1460 char buf[200]; 1461 jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s", 1462 recv_klass->external_name(), 1463 resolved_klass->external_name()); 1464 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1465 } 1466 1467 methodHandle selected_method = resolved_method; 1468 1469 // resolve the method in the receiver class, unless it is private 1470 if (!resolved_method()->is_private()) { 1471 // do lookup based on receiver klass 1472 // This search must match the linktime preparation search for itable initialization 1473 // to correctly enforce loader constraints for interface method inheritance. 1474 // Private methods are skipped as the resolved method was not private. 1475 selected_method = lookup_instance_method_in_klasses(recv_klass, 1476 resolved_method->name(), 1477 resolved_method->signature(), 1478 Klass::skip_private, CHECK); 1479 1480 if (selected_method.is_null() && !check_null_and_abstract) { 1481 // In theory this is a harmless placeholder value, but 1482 // in practice leaving in null affects the nsk default method tests. 1483 // This needs further study. 1484 selected_method = resolved_method; 1485 } 1486 // check if method exists 1487 if (selected_method.is_null()) { 1488 // Pass arguments for generating a verbose error message. 1489 throw_abstract_method_error(resolved_method, recv_klass, CHECK); 1490 } 1491 // check access 1492 // Throw Illegal Access Error if selected_method is not public. 1493 if (!selected_method->is_public()) { 1494 ResourceMark rm(THREAD); 1495 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), 1496 Method::name_and_sig_as_C_string(recv_klass, 1497 selected_method->name(), 1498 selected_method->signature())); 1499 } 1500 // check if abstract 1501 if (check_null_and_abstract && selected_method->is_abstract()) { 1502 throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK); 1503 } 1504 } 1505 1506 if (log_develop_is_enabled(Trace, itables)) { 1507 trace_method_resolution("invokeinterface selected method: receiver-class:", 1508 recv_klass, resolved_klass, selected_method, true); 1509 } 1510 // setup result 1511 if (resolved_method->has_vtable_index()) { 1512 int vtable_index = resolved_method->vtable_index(); 1513 log_develop_trace(itables)(" -- vtable index: %d", vtable_index); 1514 assert(vtable_index == selected_method->vtable_index(), "sanity check"); 1515 result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK); 1516 } else if (resolved_method->has_itable_index()) { 1517 int itable_index = resolved_method()->itable_index(); 1518 log_develop_trace(itables)(" -- itable index: %d", itable_index); 1519 result.set_interface(resolved_klass, recv_klass, resolved_method, selected_method, itable_index, CHECK); 1520 } else { 1521 int index = resolved_method->vtable_index(); 1522 log_develop_trace(itables)(" -- non itable/vtable index: %d", index); 1523 assert(index == Method::nonvirtual_vtable_index, "Oops hit another case!"); 1524 assert(resolved_method()->is_private() || 1525 (resolved_method()->is_final() && resolved_method->method_holder() == SystemDictionary::Object_klass()), 1526 "Should only have non-virtual invokeinterface for private or final-Object methods!"); 1527 assert(resolved_method()->can_be_statically_bound(), "Should only have non-virtual invokeinterface for statically bound methods!"); 1528 // This sets up the nonvirtual form of "virtual" call (as needed for final and private methods) 1529 result.set_virtual(resolved_klass, resolved_klass, resolved_method, resolved_method, index, CHECK); 1530 } 1531 } 1532 1533 1534 methodHandle LinkResolver::linktime_resolve_interface_method_or_null( 1535 const LinkInfo& link_info) { 1536 EXCEPTION_MARK; 1537 methodHandle method_result = linktime_resolve_interface_method(link_info, THREAD); 1538 if (HAS_PENDING_EXCEPTION) { 1539 CLEAR_PENDING_EXCEPTION; 1540 return methodHandle(); 1541 } else { 1542 return method_result; 1543 } 1544 } 1545 1546 methodHandle LinkResolver::linktime_resolve_virtual_method_or_null( 1547 const LinkInfo& link_info) { 1548 EXCEPTION_MARK; 1549 methodHandle method_result = linktime_resolve_virtual_method(link_info, THREAD); 1550 if (HAS_PENDING_EXCEPTION) { 1551 CLEAR_PENDING_EXCEPTION; 1552 return methodHandle(); 1553 } else { 1554 return method_result; 1555 } 1556 } 1557 1558 methodHandle LinkResolver::resolve_virtual_call_or_null( 1559 Klass* receiver_klass, 1560 const LinkInfo& link_info) { 1561 EXCEPTION_MARK; 1562 CallInfo info; 1563 resolve_virtual_call(info, Handle(), receiver_klass, link_info, false, THREAD); 1564 if (HAS_PENDING_EXCEPTION) { 1565 CLEAR_PENDING_EXCEPTION; 1566 return methodHandle(); 1567 } 1568 return info.selected_method(); 1569 } 1570 1571 methodHandle LinkResolver::resolve_interface_call_or_null( 1572 Klass* receiver_klass, 1573 const LinkInfo& link_info) { 1574 EXCEPTION_MARK; 1575 CallInfo info; 1576 resolve_interface_call(info, Handle(), receiver_klass, link_info, false, THREAD); 1577 if (HAS_PENDING_EXCEPTION) { 1578 CLEAR_PENDING_EXCEPTION; 1579 return methodHandle(); 1580 } 1581 return info.selected_method(); 1582 } 1583 1584 int LinkResolver::resolve_virtual_vtable_index(Klass* receiver_klass, 1585 const LinkInfo& link_info) { 1586 EXCEPTION_MARK; 1587 CallInfo info; 1588 resolve_virtual_call(info, Handle(), receiver_klass, link_info, 1589 /*check_null_or_abstract*/false, THREAD); 1590 if (HAS_PENDING_EXCEPTION) { 1591 CLEAR_PENDING_EXCEPTION; 1592 return Method::invalid_vtable_index; 1593 } 1594 return info.vtable_index(); 1595 } 1596 1597 methodHandle LinkResolver::resolve_static_call_or_null(const LinkInfo& link_info) { 1598 EXCEPTION_MARK; 1599 CallInfo info; 1600 resolve_static_call(info, link_info, /*initialize_class*/false, THREAD); 1601 if (HAS_PENDING_EXCEPTION) { 1602 CLEAR_PENDING_EXCEPTION; 1603 return methodHandle(); 1604 } 1605 return info.selected_method(); 1606 } 1607 1608 methodHandle LinkResolver::resolve_special_call_or_null(const LinkInfo& link_info) { 1609 EXCEPTION_MARK; 1610 CallInfo info; 1611 resolve_special_call(info, Handle(), link_info, THREAD); 1612 if (HAS_PENDING_EXCEPTION) { 1613 CLEAR_PENDING_EXCEPTION; 1614 return methodHandle(); 1615 } 1616 return info.selected_method(); 1617 } 1618 1619 1620 1621 //------------------------------------------------------------------------------------------------------------------------ 1622 // ConstantPool entries 1623 1624 void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) { 1625 switch (byte) { 1626 case Bytecodes::_invokestatic : resolve_invokestatic (result, pool, index, CHECK); break; 1627 case Bytecodes::_invokespecial : resolve_invokespecial (result, recv, pool, index, CHECK); break; 1628 case Bytecodes::_invokevirtual : resolve_invokevirtual (result, recv, pool, index, CHECK); break; 1629 case Bytecodes::_invokehandle : resolve_invokehandle (result, pool, index, CHECK); break; 1630 case Bytecodes::_invokedynamic : resolve_invokedynamic (result, pool, index, CHECK); break; 1631 case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break; 1632 default : break; 1633 } 1634 return; 1635 } 1636 1637 void LinkResolver::resolve_invoke(CallInfo& result, Handle& recv, 1638 const methodHandle& attached_method, 1639 Bytecodes::Code byte, TRAPS) { 1640 Klass* defc = attached_method->method_holder(); 1641 Symbol* name = attached_method->name(); 1642 Symbol* type = attached_method->signature(); 1643 LinkInfo link_info(defc, name, type); 1644 switch(byte) { 1645 case Bytecodes::_invokevirtual: 1646 resolve_virtual_call(result, recv, recv->klass(), link_info, 1647 /*check_null_and_abstract=*/true, CHECK); 1648 break; 1649 case Bytecodes::_invokeinterface: 1650 resolve_interface_call(result, recv, recv->klass(), link_info, 1651 /*check_null_and_abstract=*/true, CHECK); 1652 break; 1653 case Bytecodes::_invokestatic: 1654 resolve_static_call(result, link_info, /*initialize_class=*/false, CHECK); 1655 break; 1656 case Bytecodes::_invokespecial: 1657 resolve_special_call(result, recv, link_info, CHECK); 1658 break; 1659 default: 1660 fatal("bad call: %s", Bytecodes::name(byte)); 1661 break; 1662 } 1663 } 1664 1665 void LinkResolver::resolve_invokestatic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) { 1666 LinkInfo link_info(pool, index, CHECK); 1667 resolve_static_call(result, link_info, /*initialize_class*/true, CHECK); 1668 } 1669 1670 1671 void LinkResolver::resolve_invokespecial(CallInfo& result, Handle recv, 1672 const constantPoolHandle& pool, int index, TRAPS) { 1673 LinkInfo link_info(pool, index, CHECK); 1674 resolve_special_call(result, recv, link_info, CHECK); 1675 } 1676 1677 1678 void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv, 1679 const constantPoolHandle& pool, int index, 1680 TRAPS) { 1681 1682 LinkInfo link_info(pool, index, CHECK); 1683 Klass* recvrKlass = recv.is_null() ? (Klass*)NULL : recv->klass(); 1684 resolve_virtual_call(result, recv, recvrKlass, link_info, /*check_null_or_abstract*/true, CHECK); 1685 } 1686 1687 1688 void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, TRAPS) { 1689 LinkInfo link_info(pool, index, CHECK); 1690 Klass* recvrKlass = recv.is_null() ? (Klass*)NULL : recv->klass(); 1691 resolve_interface_call(result, recv, recvrKlass, link_info, true, CHECK); 1692 } 1693 1694 1695 void LinkResolver::resolve_invokehandle(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) { 1696 // This guy is reached from InterpreterRuntime::resolve_invokehandle. 1697 LinkInfo link_info(pool, index, CHECK); 1698 if (TraceMethodHandles) { 1699 ResourceMark rm(THREAD); 1700 tty->print_cr("resolve_invokehandle %s %s", link_info.name()->as_C_string(), 1701 link_info.signature()->as_C_string()); 1702 } 1703 resolve_handle_call(result, link_info, CHECK); 1704 } 1705 1706 void LinkResolver::resolve_handle_call(CallInfo& result, 1707 const LinkInfo& link_info, 1708 TRAPS) { 1709 // JSR 292: this must be an implicitly generated method MethodHandle.invokeExact(*...) or similar 1710 Klass* resolved_klass = link_info.resolved_klass(); 1711 assert(resolved_klass == SystemDictionary::MethodHandle_klass() || 1712 resolved_klass == SystemDictionary::VarHandle_klass(), ""); 1713 assert(MethodHandles::is_signature_polymorphic_name(link_info.name()), ""); 1714 Handle resolved_appendix; 1715 Handle resolved_method_type; 1716 methodHandle resolved_method = lookup_polymorphic_method(link_info, 1717 &resolved_appendix, &resolved_method_type, CHECK); 1718 result.set_handle(resolved_klass, resolved_method, resolved_appendix, resolved_method_type, CHECK); 1719 } 1720 1721 void LinkResolver::resolve_invokedynamic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) { 1722 Symbol* method_name = pool->name_ref_at(index); 1723 Symbol* method_signature = pool->signature_ref_at(index); 1724 Klass* current_klass = pool->pool_holder(); 1725 1726 // Resolve the bootstrap specifier (BSM + optional arguments). 1727 Handle bootstrap_specifier; 1728 // Check if CallSite has been bound already: 1729 ConstantPoolCacheEntry* cpce = pool->invokedynamic_cp_cache_entry_at(index); 1730 int pool_index = cpce->constant_pool_index(); 1731 1732 if (cpce->is_f1_null()) { 1733 if (cpce->indy_resolution_failed()) { 1734 ConstantPool::throw_resolution_error(pool, 1735 ResolutionErrorTable::encode_cpcache_index(index), 1736 CHECK); 1737 } 1738 1739 // The initial step in Call Site Specifier Resolution is to resolve the symbolic 1740 // reference to a method handle which will be the bootstrap method for a dynamic 1741 // call site. If resolution for the java.lang.invoke.MethodHandle for the bootstrap 1742 // method fails, then a MethodHandleInError is stored at the corresponding bootstrap 1743 // method's CP index for the CONSTANT_MethodHandle_info. So, there is no need to 1744 // set the indy_rf flag since any subsequent invokedynamic instruction which shares 1745 // this bootstrap method will encounter the resolution of MethodHandleInError. 1746 oop bsm_info = pool->resolve_bootstrap_specifier_at(pool_index, THREAD); 1747 Exceptions::wrap_dynamic_exception(CHECK); 1748 assert(bsm_info != NULL, ""); 1749 // FIXME: Cache this once per BootstrapMethods entry, not once per CONSTANT_InvokeDynamic. 1750 bootstrap_specifier = Handle(THREAD, bsm_info); 1751 } 1752 if (!cpce->is_f1_null()) { 1753 methodHandle method( THREAD, cpce->f1_as_method()); 1754 Handle appendix( THREAD, cpce->appendix_if_resolved(pool)); 1755 Handle method_type(THREAD, cpce->method_type_if_resolved(pool)); 1756 result.set_handle(method, appendix, method_type, THREAD); 1757 Exceptions::wrap_dynamic_exception(CHECK); 1758 return; 1759 } 1760 1761 if (TraceMethodHandles) { 1762 ResourceMark rm(THREAD); 1763 tty->print_cr("resolve_invokedynamic #%d %s %s in %s", 1764 ConstantPool::decode_invokedynamic_index(index), 1765 method_name->as_C_string(), method_signature->as_C_string(), 1766 current_klass->name()->as_C_string()); 1767 tty->print(" BSM info: "); bootstrap_specifier->print(); 1768 } 1769 1770 resolve_dynamic_call(result, pool_index, bootstrap_specifier, method_name, 1771 method_signature, current_klass, THREAD); 1772 if (HAS_PENDING_EXCEPTION && PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { 1773 int encoded_index = ResolutionErrorTable::encode_cpcache_index(index); 1774 bool recorded_res_status = cpce->save_and_throw_indy_exc(pool, pool_index, 1775 encoded_index, 1776 pool()->tag_at(pool_index), 1777 CHECK); 1778 if (!recorded_res_status) { 1779 // Another thread got here just before we did. So, either use the method 1780 // that it resolved or throw the LinkageError exception that it threw. 1781 if (!cpce->is_f1_null()) { 1782 methodHandle method( THREAD, cpce->f1_as_method()); 1783 Handle appendix( THREAD, cpce->appendix_if_resolved(pool)); 1784 Handle method_type(THREAD, cpce->method_type_if_resolved(pool)); 1785 result.set_handle(method, appendix, method_type, THREAD); 1786 Exceptions::wrap_dynamic_exception(CHECK); 1787 } else { 1788 assert(cpce->indy_resolution_failed(), "Resolution failure flag not set"); 1789 ConstantPool::throw_resolution_error(pool, encoded_index, CHECK); 1790 } 1791 return; 1792 } 1793 assert(cpce->indy_resolution_failed(), "Resolution failure flag wasn't set"); 1794 } 1795 } 1796 1797 void LinkResolver::resolve_dynamic_call(CallInfo& result, 1798 int pool_index, 1799 Handle bootstrap_specifier, 1800 Symbol* method_name, Symbol* method_signature, 1801 Klass* current_klass, 1802 TRAPS) { 1803 // JSR 292: this must resolve to an implicitly generated method MH.linkToCallSite(*...) 1804 // The appendix argument is likely to be a freshly-created CallSite. 1805 Handle resolved_appendix; 1806 Handle resolved_method_type; 1807 methodHandle resolved_method = 1808 SystemDictionary::find_dynamic_call_site_invoker(current_klass, 1809 pool_index, 1810 bootstrap_specifier, 1811 method_name, method_signature, 1812 &resolved_appendix, 1813 &resolved_method_type, 1814 THREAD); 1815 Exceptions::wrap_dynamic_exception(CHECK); 1816 result.set_handle(resolved_method, resolved_appendix, resolved_method_type, THREAD); 1817 Exceptions::wrap_dynamic_exception(CHECK); 1818 } 1819 1820 // Selected method is abstract. 1821 void LinkResolver::throw_abstract_method_error(const methodHandle& resolved_method, 1822 const methodHandle& selected_method, 1823 Klass *recv_klass, TRAPS) { 1824 Klass *resolved_klass = resolved_method->method_holder(); 1825 ResourceMark rm(THREAD); 1826 stringStream ss; 1827 1828 if (recv_klass != NULL) { 1829 ss.print("Receiver class %s does not define or inherit an " 1830 "implementation of the", 1831 recv_klass->external_name()); 1832 } else { 1833 ss.print("Missing implementation of"); 1834 } 1835 1836 assert(resolved_method.not_null(), "Sanity"); 1837 ss.print(" resolved method %s%s%s%s of %s %s.", 1838 resolved_method->is_abstract() ? "abstract " : "", 1839 resolved_method->is_private() ? "private " : "", 1840 resolved_method->name()->as_C_string(), 1841 resolved_method->signature()->as_C_string(), 1842 resolved_klass->external_kind(), 1843 resolved_klass->external_name()); 1844 1845 if (selected_method.not_null() && !(resolved_method == selected_method)) { 1846 ss.print(" Selected method is %s%s%s.", 1847 selected_method->is_abstract() ? "abstract " : "", 1848 selected_method->is_private() ? "private " : "", 1849 selected_method->name_and_sig_as_C_string()); 1850 } 1851 1852 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string()); 1853 }