1 /* 2 * Copyright (c) 1997, 2019, 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/constantPool.hpp" 43 #include "oops/cpCache.inline.hpp" 44 #include "oops/instanceKlass.hpp" 45 #include "oops/method.hpp" 46 #include "oops/objArrayKlass.hpp" 47 #include "oops/objArrayOop.hpp" 48 #include "oops/oop.inline.hpp" 49 #include "prims/methodHandles.hpp" 50 #include "prims/nativeLookup.hpp" 51 #include "runtime/compilationPolicy.hpp" 52 #include "runtime/fieldDescriptor.inline.hpp" 53 #include "runtime/frame.inline.hpp" 54 #include "runtime/handles.inline.hpp" 55 #include "runtime/reflection.hpp" 56 #include "runtime/safepointVerifiers.hpp" 57 #include "runtime/signature.hpp" 58 #include "runtime/thread.inline.hpp" 59 #include "runtime/vmThread.hpp" 60 61 //------------------------------------------------------------------------------------------------------------------------ 62 // Implementation of CallInfo 63 64 65 void CallInfo::set_static(Klass* resolved_klass, const methodHandle& resolved_method, TRAPS) { 66 int vtable_index = Method::nonvirtual_vtable_index; 67 set_common(resolved_klass, resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK); 68 } 69 70 71 void CallInfo::set_interface(Klass* resolved_klass, 72 Klass* selected_klass, 73 const methodHandle& resolved_method, 74 const methodHandle& selected_method, 75 int itable_index, TRAPS) { 76 // This is only called for interface methods. If the resolved_method 77 // comes from java/lang/Object, it can be the subject of a virtual call, so 78 // we should pick the vtable index from the resolved method. 79 // In that case, the caller must call set_virtual instead of set_interface. 80 assert(resolved_method->method_holder()->is_interface(), ""); 81 assert(itable_index == resolved_method()->itable_index(), ""); 82 set_common(resolved_klass, selected_klass, resolved_method, selected_method, CallInfo::itable_call, itable_index, CHECK); 83 } 84 85 void CallInfo::set_virtual(Klass* resolved_klass, 86 Klass* selected_klass, 87 const methodHandle& resolved_method, 88 const methodHandle& selected_method, 89 int vtable_index, TRAPS) { 90 assert(vtable_index >= 0 || vtable_index == Method::nonvirtual_vtable_index, "valid index"); 91 assert(vtable_index < 0 || !resolved_method->has_vtable_index() || vtable_index == resolved_method->vtable_index(), ""); 92 CallKind kind = (vtable_index >= 0 && !resolved_method->can_be_statically_bound() ? CallInfo::vtable_call : CallInfo::direct_call); 93 set_common(resolved_klass, selected_klass, resolved_method, selected_method, kind, vtable_index, CHECK); 94 assert(!resolved_method->is_compiled_lambda_form(), "these must be handled via an invokehandle call"); 95 } 96 97 void CallInfo::set_handle(const methodHandle& resolved_method, 98 Handle resolved_appendix, TRAPS) { 99 set_handle(SystemDictionary::MethodHandle_klass(), resolved_method, resolved_appendix, CHECK); 100 } 101 102 void CallInfo::set_handle(Klass* resolved_klass, 103 const methodHandle& resolved_method, 104 Handle resolved_appendix, TRAPS) { 105 guarantee(resolved_method.not_null(), "resolved method is null"); 106 assert(resolved_method->intrinsic_id() == vmIntrinsics::_invokeBasic || 107 resolved_method->is_compiled_lambda_form(), 108 "linkMethod must return one of these"); 109 int vtable_index = Method::nonvirtual_vtable_index; 110 assert(!resolved_method->has_vtable_index(), ""); 111 set_common(resolved_klass, resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK); 112 _resolved_appendix = resolved_appendix; 113 } 114 115 void CallInfo::set_common(Klass* resolved_klass, 116 Klass* selected_klass, 117 const methodHandle& resolved_method, 118 const methodHandle& selected_method, 119 CallKind kind, 120 int index, 121 TRAPS) { 122 assert(resolved_method->signature() == selected_method->signature(), "signatures must correspond"); 123 _resolved_klass = resolved_klass; 124 _selected_klass = selected_klass; 125 _resolved_method = resolved_method; 126 _selected_method = selected_method; 127 _call_kind = kind; 128 _call_index = index; 129 _resolved_appendix = Handle(); 130 DEBUG_ONLY(verify()); // verify before making side effects 131 132 CompilationPolicy::compile_if_required(selected_method, THREAD); 133 } 134 135 // utility query for unreflecting a method 136 CallInfo::CallInfo(Method* resolved_method, Klass* resolved_klass, TRAPS) { 137 Klass* resolved_method_holder = resolved_method->method_holder(); 138 if (resolved_klass == NULL) { // 2nd argument defaults to holder of 1st 139 resolved_klass = resolved_method_holder; 140 } 141 _resolved_klass = resolved_klass; 142 _selected_klass = resolved_klass; 143 _resolved_method = resolved_method; 144 _selected_method = resolved_method; 145 // classify: 146 CallKind kind = CallInfo::unknown_kind; 147 int index = resolved_method->vtable_index(); 148 if (resolved_method->can_be_statically_bound()) { 149 kind = CallInfo::direct_call; 150 } else if (!resolved_method_holder->is_interface()) { 151 // Could be an Object method inherited into an interface, but still a vtable call. 152 kind = CallInfo::vtable_call; 153 } else if (!resolved_klass->is_interface()) { 154 // A default or miranda method. Compute the vtable index. 155 index = LinkResolver::vtable_index_of_interface_method(resolved_klass, 156 resolved_method); 157 assert(index >= 0 , "we should have valid vtable index at this point"); 158 159 kind = CallInfo::vtable_call; 160 } else if (resolved_method->has_vtable_index()) { 161 // Can occur if an interface redeclares a method of Object. 162 163 #ifdef ASSERT 164 // Ensure that this is really the case. 165 Klass* object_klass = SystemDictionary::Object_klass(); 166 Method * object_resolved_method = object_klass->vtable().method_at(index); 167 assert(object_resolved_method->name() == resolved_method->name(), 168 "Object and interface method names should match at vtable index %d, %s != %s", 169 index, object_resolved_method->name()->as_C_string(), resolved_method->name()->as_C_string()); 170 assert(object_resolved_method->signature() == resolved_method->signature(), 171 "Object and interface method signatures should match at vtable index %d, %s != %s", 172 index, object_resolved_method->signature()->as_C_string(), resolved_method->signature()->as_C_string()); 173 #endif // ASSERT 174 175 kind = CallInfo::vtable_call; 176 } else { 177 // A regular interface call. 178 kind = CallInfo::itable_call; 179 index = resolved_method->itable_index(); 180 } 181 assert(index == Method::nonvirtual_vtable_index || index >= 0, "bad index %d", index); 182 _call_kind = kind; 183 _call_index = index; 184 _resolved_appendix = Handle(); 185 // Find or create a ResolvedMethod instance for this Method* 186 set_resolved_method_name(CHECK); 187 188 DEBUG_ONLY(verify()); 189 } 190 191 void CallInfo::set_resolved_method_name(TRAPS) { 192 Method* m = _resolved_method(); 193 assert(m != NULL, "Should already have a Method*"); 194 oop rmethod_name = java_lang_invoke_ResolvedMethodName::find_resolved_method(m, CHECK); 195 _resolved_method_name = Handle(THREAD, rmethod_name); 196 } 197 198 #ifdef ASSERT 199 void CallInfo::verify() { 200 switch (call_kind()) { // the meaning and allowed value of index depends on kind 201 case CallInfo::direct_call: 202 if (_call_index == Method::nonvirtual_vtable_index) break; 203 // else fall through to check vtable index: 204 case CallInfo::vtable_call: 205 assert(resolved_klass()->verify_vtable_index(_call_index), ""); 206 break; 207 case CallInfo::itable_call: 208 assert(resolved_method()->method_holder()->verify_itable_index(_call_index), ""); 209 break; 210 case CallInfo::unknown_kind: 211 assert(call_kind() != CallInfo::unknown_kind, "CallInfo must be set"); 212 break; 213 default: 214 fatal("Unexpected call kind %d", call_kind()); 215 } 216 } 217 #endif // ASSERT 218 219 #ifndef PRODUCT 220 void CallInfo::print() { 221 ResourceMark rm; 222 const char* kindstr; 223 switch (_call_kind) { 224 case direct_call: kindstr = "direct"; break; 225 case vtable_call: kindstr = "vtable"; break; 226 case itable_call: kindstr = "itable"; break; 227 default : kindstr = "unknown"; break; 228 } 229 tty->print_cr("Call %s@%d %s", kindstr, _call_index, 230 _resolved_method.is_null() ? "(none)" : _resolved_method->name_and_sig_as_C_string()); 231 } 232 #endif 233 234 //------------------------------------------------------------------------------------------------------------------------ 235 // Implementation of LinkInfo 236 237 LinkInfo::LinkInfo(const constantPoolHandle& pool, int index, const methodHandle& current_method, TRAPS) { 238 // resolve klass 239 _resolved_klass = pool->klass_ref_at(index, CHECK); 240 241 // Get name, signature, and static klass 242 _name = pool->name_ref_at(index); 243 _signature = pool->signature_ref_at(index); 244 _tag = pool->tag_ref_at(index); 245 _current_klass = pool->pool_holder(); 246 _current_method = current_method; 247 248 // Coming from the constant pool always checks access 249 _check_access = true; 250 } 251 252 LinkInfo::LinkInfo(const constantPoolHandle& pool, int index, TRAPS) { 253 // resolve klass 254 _resolved_klass = pool->klass_ref_at(index, CHECK); 255 256 // Get name, signature, and static klass 257 _name = pool->name_ref_at(index); 258 _signature = pool->signature_ref_at(index); 259 _tag = pool->tag_ref_at(index); 260 _current_klass = pool->pool_holder(); 261 _current_method = methodHandle(); 262 263 // Coming from the constant pool always checks access 264 _check_access = true; 265 } 266 267 #ifndef PRODUCT 268 void LinkInfo::print() { 269 ResourceMark rm; 270 tty->print_cr("Link resolved_klass=%s name=%s signature=%s current_klass=%s check_access=%s", 271 _resolved_klass->name()->as_C_string(), 272 _name->as_C_string(), 273 _signature->as_C_string(), 274 _current_klass == NULL ? "(none)" : _current_klass->name()->as_C_string(), 275 _check_access ? "true" : "false"); 276 } 277 #endif // PRODUCT 278 //------------------------------------------------------------------------------------------------------------------------ 279 // Klass resolution 280 281 void LinkResolver::check_klass_accessability(Klass* ref_klass, Klass* sel_klass, 282 bool fold_type_to_class, TRAPS) { 283 Klass* base_klass = sel_klass; 284 if (fold_type_to_class) { 285 if (sel_klass->is_objArray_klass()) { 286 base_klass = ObjArrayKlass::cast(sel_klass)->bottom_klass(); 287 } 288 // The element type could be a typeArray - we only need the access 289 // check if it is a reference to another class. 290 if (!base_klass->is_instance_klass()) { 291 return; // no relevant check to do 292 } 293 } 294 Reflection::VerifyClassAccessResults vca_result = 295 Reflection::verify_class_access(ref_klass, InstanceKlass::cast(base_klass), true); 296 if (vca_result != Reflection::ACCESS_OK) { 297 ResourceMark rm(THREAD); 298 char* msg = Reflection::verify_class_access_msg(ref_klass, 299 InstanceKlass::cast(base_klass), 300 vca_result); 301 bool same_module = (base_klass->module() == ref_klass->module()); 302 if (msg == NULL) { 303 Exceptions::fthrow( 304 THREAD_AND_LOCATION, 305 vmSymbols::java_lang_IllegalAccessError(), 306 "failed to access class %s from class %s (%s%s%s)", 307 base_klass->external_name(), 308 ref_klass->external_name(), 309 (same_module) ? base_klass->joint_in_module_of_loader(ref_klass) : base_klass->class_in_module_of_loader(), 310 (same_module) ? "" : "; ", 311 (same_module) ? "" : ref_klass->class_in_module_of_loader()); 312 } else { 313 // Use module specific message returned by verify_class_access_msg(). 314 Exceptions::fthrow( 315 THREAD_AND_LOCATION, 316 vmSymbols::java_lang_IllegalAccessError(), 317 "%s", msg); 318 } 319 } 320 } 321 322 //------------------------------------------------------------------------------------------------------------------------ 323 // Method resolution 324 // 325 // According to JVM spec. $5.4.3c & $5.4.3d 326 327 // Look up method in klasses, including static methods 328 // Then look up local default methods 329 Method* LinkResolver::lookup_method_in_klasses(const LinkInfo& link_info, 330 bool checkpolymorphism, 331 bool in_imethod_resolve) { 332 NoSafepointVerifier nsv; // Method* returned may not be reclaimed 333 334 Klass* klass = link_info.resolved_klass(); 335 Symbol* name = link_info.name(); 336 Symbol* signature = link_info.signature(); 337 338 // Ignore overpasses so statics can be found during resolution 339 Method* result = klass->uncached_lookup_method(name, signature, Klass::skip_overpass); 340 341 if (klass->is_array_klass()) { 342 // Only consider klass and super klass for arrays 343 return result; 344 } 345 346 InstanceKlass* ik = InstanceKlass::cast(klass); 347 348 // JDK 8, JVMS 5.4.3.4: Interface method resolution should 349 // ignore static and non-public methods of java.lang.Object, 350 // like clone, finalize, registerNatives. 351 if (in_imethod_resolve && 352 result != NULL && 353 ik->is_interface() && 354 (result->is_static() || !result->is_public()) && 355 result->method_holder() == SystemDictionary::Object_klass()) { 356 result = NULL; 357 } 358 359 // Before considering default methods, check for an overpass in the 360 // current class if a method has not been found. 361 if (result == NULL) { 362 result = ik->find_method(name, signature); 363 } 364 365 if (result == NULL) { 366 Array<Method*>* default_methods = ik->default_methods(); 367 if (default_methods != NULL) { 368 result = InstanceKlass::find_method(default_methods, name, signature); 369 } 370 } 371 372 if (checkpolymorphism && result != NULL) { 373 vmIntrinsics::ID iid = result->intrinsic_id(); 374 if (MethodHandles::is_signature_polymorphic(iid)) { 375 // Do not link directly to these. The VM must produce a synthetic one using lookup_polymorphic_method. 376 return NULL; 377 } 378 } 379 return result; 380 } 381 382 // returns first instance method 383 // Looks up method in classes, then looks up local default methods 384 methodHandle LinkResolver::lookup_instance_method_in_klasses(Klass* klass, 385 Symbol* name, 386 Symbol* signature, 387 Klass::PrivateLookupMode private_mode, TRAPS) { 388 Method* result = klass->uncached_lookup_method(name, signature, Klass::find_overpass, private_mode); 389 390 while (result != NULL && result->is_static() && result->method_holder()->super() != NULL) { 391 Klass* super_klass = result->method_holder()->super(); 392 result = super_klass->uncached_lookup_method(name, signature, Klass::find_overpass, private_mode); 393 } 394 395 if (klass->is_array_klass()) { 396 // Only consider klass and super klass for arrays 397 return methodHandle(THREAD, result); 398 } 399 400 if (result == NULL) { 401 Array<Method*>* default_methods = InstanceKlass::cast(klass)->default_methods(); 402 if (default_methods != NULL) { 403 result = InstanceKlass::find_method(default_methods, name, signature); 404 assert(result == NULL || !result->is_static(), "static defaults not allowed"); 405 } 406 } 407 return methodHandle(THREAD, result); 408 } 409 410 int LinkResolver::vtable_index_of_interface_method(Klass* klass, 411 const methodHandle& resolved_method) { 412 413 int vtable_index = Method::invalid_vtable_index; 414 Symbol* name = resolved_method->name(); 415 Symbol* signature = resolved_method->signature(); 416 InstanceKlass* ik = InstanceKlass::cast(klass); 417 418 // First check in default method array 419 if (!resolved_method->is_abstract() && ik->default_methods() != NULL) { 420 int index = InstanceKlass::find_method_index(ik->default_methods(), 421 name, signature, Klass::find_overpass, 422 Klass::find_static, Klass::find_private); 423 if (index >= 0 ) { 424 vtable_index = ik->default_vtable_indices()->at(index); 425 } 426 } 427 if (vtable_index == Method::invalid_vtable_index) { 428 // get vtable_index for miranda methods 429 klassVtable vt = ik->vtable(); 430 vtable_index = vt.index_of_miranda(name, signature); 431 } 432 return vtable_index; 433 } 434 435 Method* LinkResolver::lookup_method_in_interfaces(const LinkInfo& cp_info) { 436 InstanceKlass *ik = InstanceKlass::cast(cp_info.resolved_klass()); 437 438 // Specify 'true' in order to skip default methods when searching the 439 // interfaces. Function lookup_method_in_klasses() already looked for 440 // the method in the default methods table. 441 return ik->lookup_method_in_all_interfaces(cp_info.name(), cp_info.signature(), Klass::skip_defaults); 442 } 443 444 methodHandle LinkResolver::lookup_polymorphic_method( 445 const LinkInfo& link_info, 446 Handle *appendix_result_or_null, 447 TRAPS) { 448 Klass* klass = link_info.resolved_klass(); 449 Symbol* name = link_info.name(); 450 Symbol* full_signature = link_info.signature(); 451 452 vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name); 453 if (TraceMethodHandles) { 454 ResourceMark rm(THREAD); 455 tty->print_cr("lookup_polymorphic_method iid=%s %s.%s%s", 456 vmIntrinsics::name_at(iid), klass->external_name(), 457 name->as_C_string(), full_signature->as_C_string()); 458 } 459 if ((klass == SystemDictionary::MethodHandle_klass() || 460 klass == SystemDictionary::VarHandle_klass()) && 461 iid != vmIntrinsics::_none) { 462 if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) { 463 // Most of these do not need an up-call to Java to resolve, so can be done anywhere. 464 // Do not erase last argument type (MemberName) if it is a static linkTo method. 465 bool keep_last_arg = MethodHandles::is_signature_polymorphic_static(iid); 466 TempNewSymbol basic_signature = 467 MethodHandles::lookup_basic_type_signature(full_signature, keep_last_arg, CHECK_NULL); 468 if (TraceMethodHandles) { 469 ResourceMark rm(THREAD); 470 tty->print_cr("lookup_polymorphic_method %s %s => basic %s", 471 name->as_C_string(), 472 full_signature->as_C_string(), 473 basic_signature->as_C_string()); 474 } 475 methodHandle result = SystemDictionary::find_method_handle_intrinsic(iid, 476 basic_signature, 477 CHECK_NULL); 478 if (result.not_null()) { 479 assert(result->is_method_handle_intrinsic(), "MH.invokeBasic or MH.linkTo* intrinsic"); 480 assert(result->intrinsic_id() != vmIntrinsics::_invokeGeneric, "wrong place to find this"); 481 assert(basic_signature == result->signature(), "predict the result signature"); 482 if (TraceMethodHandles) { 483 ttyLocker ttyl; 484 tty->print("lookup_polymorphic_method => intrinsic "); 485 result->print_on(tty); 486 } 487 } 488 return result; 489 } else if (iid == vmIntrinsics::_invokeGeneric 490 && THREAD->can_call_java() 491 && appendix_result_or_null != NULL) { 492 // This is a method with type-checking semantics. 493 // We will ask Java code to spin an adapter method for it. 494 if (!MethodHandles::enabled()) { 495 // Make sure the Java part of the runtime has been booted up. 496 Klass* natives = SystemDictionary::MethodHandleNatives_klass(); 497 if (natives == NULL || InstanceKlass::cast(natives)->is_not_initialized()) { 498 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_invoke_MethodHandleNatives(), 499 Handle(), 500 Handle(), 501 true, 502 CHECK_NULL); 503 } 504 } 505 506 Handle appendix; 507 Handle method_type; 508 methodHandle result = SystemDictionary::find_method_handle_invoker( 509 klass, 510 name, 511 full_signature, 512 link_info.current_klass(), 513 &appendix, 514 CHECK_NULL); 515 if (TraceMethodHandles) { 516 ttyLocker ttyl; 517 tty->print("lookup_polymorphic_method => (via Java) "); 518 result->print_on(tty); 519 tty->print(" lookup_polymorphic_method => appendix = "); 520 if (appendix.is_null()) tty->print_cr("(none)"); 521 else appendix->print_on(tty); 522 } 523 if (result.not_null()) { 524 #ifdef ASSERT 525 ResourceMark rm(THREAD); 526 527 TempNewSymbol basic_signature = 528 MethodHandles::lookup_basic_type_signature(full_signature, CHECK_NULL); 529 int actual_size_of_params = result->size_of_parameters(); 530 int expected_size_of_params = ArgumentSizeComputer(basic_signature).size(); 531 // +1 for MethodHandle.this, +1 for trailing MethodType 532 if (!MethodHandles::is_signature_polymorphic_static(iid)) expected_size_of_params += 1; 533 if (appendix.not_null()) expected_size_of_params += 1; 534 if (actual_size_of_params != expected_size_of_params) { 535 tty->print_cr("*** basic_signature=%s", basic_signature->as_C_string()); 536 tty->print_cr("*** result for %s: ", vmIntrinsics::name_at(iid)); 537 result->print(); 538 } 539 assert(actual_size_of_params == expected_size_of_params, 540 "%d != %d", actual_size_of_params, expected_size_of_params); 541 #endif //ASSERT 542 543 assert(appendix_result_or_null != NULL, ""); 544 (*appendix_result_or_null) = appendix; 545 } 546 return result; 547 } 548 } 549 return NULL; 550 } 551 552 void LinkResolver::check_method_accessability(Klass* ref_klass, 553 Klass* resolved_klass, 554 Klass* sel_klass, 555 const methodHandle& sel_method, 556 TRAPS) { 557 558 AccessFlags flags = sel_method->access_flags(); 559 560 // Special case: arrays always override "clone". JVMS 2.15. 561 // If the resolved klass is an array class, and the declaring class 562 // is java.lang.Object and the method is "clone", set the flags 563 // to public. 564 // 565 // We'll check for the method name first, as that's most likely 566 // to be false (so we'll short-circuit out of these tests). 567 if (sel_method->name() == vmSymbols::clone_name() && 568 sel_klass == SystemDictionary::Object_klass() && 569 resolved_klass->is_array_klass()) { 570 // We need to change "protected" to "public". 571 assert(flags.is_protected(), "clone not protected?"); 572 jint new_flags = flags.as_int(); 573 new_flags = new_flags & (~JVM_ACC_PROTECTED); 574 new_flags = new_flags | JVM_ACC_PUBLIC; 575 flags.set_flags(new_flags); 576 } 577 // assert(extra_arg_result_or_null != NULL, "must be able to return extra argument"); 578 579 bool can_access = Reflection::verify_member_access(ref_klass, 580 resolved_klass, 581 sel_klass, 582 flags, 583 true, false, CHECK); 584 // Any existing exceptions that may have been thrown, for example LinkageErrors 585 // from nest-host resolution, have been allowed to propagate. 586 if (!can_access) { 587 ResourceMark rm(THREAD); 588 bool same_module = (sel_klass->module() == ref_klass->module()); 589 Exceptions::fthrow( 590 THREAD_AND_LOCATION, 591 vmSymbols::java_lang_IllegalAccessError(), 592 "class %s tried to access %s%s%smethod '%s' (%s%s%s)", 593 ref_klass->external_name(), 594 sel_method->is_abstract() ? "abstract " : "", 595 sel_method->is_protected() ? "protected " : "", 596 sel_method->is_private() ? "private " : "", 597 sel_method->external_name(), 598 (same_module) ? ref_klass->joint_in_module_of_loader(sel_klass) : ref_klass->class_in_module_of_loader(), 599 (same_module) ? "" : "; ", 600 (same_module) ? "" : sel_klass->class_in_module_of_loader() 601 ); 602 return; 603 } 604 } 605 606 methodHandle LinkResolver::resolve_method_statically(Bytecodes::Code code, 607 const constantPoolHandle& pool, int index, TRAPS) { 608 // This method is used only 609 // (1) in C2 from InlineTree::ok_to_inline (via ciMethod::check_call), 610 // and 611 // (2) in Bytecode_invoke::static_target 612 // It appears to fail when applied to an invokeinterface call site. 613 // FIXME: Remove this method and ciMethod::check_call; refactor to use the other LinkResolver entry points. 614 // resolve klass 615 if (code == Bytecodes::_invokedynamic) { 616 Klass* resolved_klass = SystemDictionary::MethodHandle_klass(); 617 Symbol* method_name = vmSymbols::invoke_name(); 618 Symbol* method_signature = pool->signature_ref_at(index); 619 Klass* current_klass = pool->pool_holder(); 620 LinkInfo link_info(resolved_klass, method_name, method_signature, current_klass); 621 return resolve_method(link_info, code, THREAD); 622 } 623 624 LinkInfo link_info(pool, index, methodHandle(), CHECK_NULL); 625 Klass* resolved_klass = link_info.resolved_klass(); 626 627 if (pool->has_preresolution() 628 || (resolved_klass == SystemDictionary::MethodHandle_klass() && 629 MethodHandles::is_signature_polymorphic_name(resolved_klass, link_info.name()))) { 630 Method* result = ConstantPool::method_at_if_loaded(pool, index); 631 if (result != NULL) { 632 return methodHandle(THREAD, result); 633 } 634 } 635 636 if (code == Bytecodes::_invokeinterface) { 637 return resolve_interface_method(link_info, code, THREAD); 638 } else if (code == Bytecodes::_invokevirtual) { 639 return resolve_method(link_info, code, THREAD); 640 } else if (!resolved_klass->is_interface()) { 641 return resolve_method(link_info, code, THREAD); 642 } else { 643 return resolve_interface_method(link_info, code, THREAD); 644 } 645 } 646 647 // Check and print a loader constraint violation message for method or interface method 648 void LinkResolver::check_method_loader_constraints(const LinkInfo& link_info, 649 const methodHandle& resolved_method, 650 const char* method_type, TRAPS) { 651 Handle current_loader(THREAD, link_info.current_klass()->class_loader()); 652 Handle resolved_loader(THREAD, resolved_method->method_holder()->class_loader()); 653 654 ResourceMark rm(THREAD); 655 Symbol* failed_type_symbol = 656 SystemDictionary::check_signature_loaders(link_info.signature(), current_loader, 657 resolved_loader, true, CHECK); 658 if (failed_type_symbol != NULL) { 659 Klass* current_class = link_info.current_klass(); 660 ClassLoaderData* current_loader_data = current_class->class_loader_data(); 661 assert(current_loader_data != NULL, "current class has no class loader data"); 662 Klass* resolved_method_class = resolved_method->method_holder(); 663 ClassLoaderData* target_loader_data = resolved_method_class->class_loader_data(); 664 assert(target_loader_data != NULL, "resolved method's class has no class loader data"); 665 666 stringStream ss; 667 ss.print("loader constraint violation: when resolving %s '", method_type); 668 Method::print_external_name(&ss, link_info.resolved_klass(), link_info.name(), link_info.signature()); 669 ss.print("' the class loader %s of the current class, %s," 670 " and the class loader %s for the method's defining class, %s, have" 671 " different Class objects for the type %s used in the signature (%s; %s)", 672 current_loader_data->loader_name_and_id(), 673 current_class->name()->as_C_string(), 674 target_loader_data->loader_name_and_id(), 675 resolved_method_class->name()->as_C_string(), 676 failed_type_symbol->as_C_string(), 677 current_class->class_in_module_of_loader(false, true), 678 resolved_method_class->class_in_module_of_loader(false, true)); 679 THROW_MSG(vmSymbols::java_lang_LinkageError(), ss.as_string()); 680 } 681 } 682 683 void LinkResolver::check_field_loader_constraints(Symbol* field, Symbol* sig, 684 Klass* current_klass, 685 Klass* sel_klass, TRAPS) { 686 Handle ref_loader(THREAD, current_klass->class_loader()); 687 Handle sel_loader(THREAD, sel_klass->class_loader()); 688 689 ResourceMark rm(THREAD); // needed for check_signature_loaders 690 Symbol* failed_type_symbol = 691 SystemDictionary::check_signature_loaders(sig, 692 ref_loader, sel_loader, 693 false, 694 CHECK); 695 if (failed_type_symbol != NULL) { 696 stringStream ss; 697 const char* failed_type_name = failed_type_symbol->as_klass_external_name(); 698 699 ss.print("loader constraint violation: when resolving field \"%s\" of type %s, " 700 "the class loader %s of the current class, %s, " 701 "and the class loader %s for the field's defining %s, %s, " 702 "have different Class objects for type %s (%s; %s)", 703 field->as_C_string(), 704 failed_type_name, 705 current_klass->class_loader_data()->loader_name_and_id(), 706 current_klass->external_name(), 707 sel_klass->class_loader_data()->loader_name_and_id(), 708 sel_klass->external_kind(), 709 sel_klass->external_name(), 710 failed_type_name, 711 current_klass->class_in_module_of_loader(false, true), 712 sel_klass->class_in_module_of_loader(false, true)); 713 THROW_MSG(vmSymbols::java_lang_LinkageError(), ss.as_string()); 714 } 715 } 716 717 methodHandle LinkResolver::resolve_method(const LinkInfo& link_info, 718 Bytecodes::Code code, TRAPS) { 719 720 Handle nested_exception; 721 Klass* resolved_klass = link_info.resolved_klass(); 722 723 // 1. For invokevirtual, cannot call an interface method 724 if (code == Bytecodes::_invokevirtual && resolved_klass->is_interface()) { 725 ResourceMark rm(THREAD); 726 char buf[200]; 727 jio_snprintf(buf, sizeof(buf), "Found interface %s, but class was expected", 728 resolved_klass->external_name()); 729 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 730 } 731 732 // 2. check constant pool tag for called method - must be JVM_CONSTANT_Methodref 733 if (!link_info.tag().is_invalid() && !link_info.tag().is_method()) { 734 ResourceMark rm(THREAD); 735 stringStream ss; 736 ss.print("Method '"); 737 Method::print_external_name(&ss, link_info.resolved_klass(), link_info.name(), link_info.signature()); 738 ss.print("' must be Methodref constant"); 739 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string()); 740 } 741 742 // 3. lookup method in resolved klass and its super klasses 743 methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, true, false)); 744 745 // 4. lookup method in all the interfaces implemented by the resolved klass 746 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) { // not found in the class hierarchy 747 resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info)); 748 749 if (resolved_method.is_null()) { 750 // JSR 292: see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc 751 resolved_method = lookup_polymorphic_method(link_info, (Handle*)NULL, THREAD); 752 if (HAS_PENDING_EXCEPTION) { 753 nested_exception = Handle(THREAD, PENDING_EXCEPTION); 754 CLEAR_PENDING_EXCEPTION; 755 } 756 } 757 } 758 759 // 5. method lookup failed 760 if (resolved_method.is_null()) { 761 ResourceMark rm(THREAD); 762 stringStream ss; 763 ss.print("'"); 764 Method::print_external_name(&ss, resolved_klass, link_info.name(), link_info.signature()); 765 ss.print("'"); 766 THROW_MSG_CAUSE_(vmSymbols::java_lang_NoSuchMethodError(), 767 ss.as_string(), nested_exception, NULL); 768 } 769 770 // 6. access checks, access checking may be turned off when calling from within the VM. 771 Klass* current_klass = link_info.current_klass(); 772 if (link_info.check_access()) { 773 assert(current_klass != NULL , "current_klass should not be null"); 774 775 // check if method can be accessed by the referring class 776 check_method_accessability(current_klass, 777 resolved_klass, 778 resolved_method->method_holder(), 779 resolved_method, 780 CHECK_NULL); 781 782 // check loader constraints 783 check_method_loader_constraints(link_info, resolved_method, "method", CHECK_NULL); 784 } 785 786 return resolved_method; 787 } 788 789 static void trace_method_resolution(const char* prefix, 790 Klass* klass, 791 Klass* resolved_klass, 792 const methodHandle& method, 793 bool logitables, 794 int index = -1) { 795 #ifndef PRODUCT 796 ResourceMark rm; 797 Log(itables) logi; 798 LogStream lsi(logi.trace()); 799 Log(vtables) logv; 800 LogStream lsv(logv.trace()); 801 outputStream* st; 802 if (logitables) { 803 st = &lsi; 804 } else { 805 st = &lsv; 806 } 807 st->print("%s%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ", 808 prefix, 809 (klass == NULL ? "<NULL>" : klass->internal_name()), 810 (resolved_klass == NULL ? "<NULL>" : resolved_klass->internal_name()), 811 Method::name_and_sig_as_C_string(resolved_klass, 812 method->name(), 813 method->signature()), 814 method->method_holder()->internal_name()); 815 method->print_linkage_flags(st); 816 if (index != -1) { 817 st->print("vtable_index:%d", index); 818 } 819 st->cr(); 820 #endif // PRODUCT 821 } 822 823 // Do linktime resolution of a method in the interface within the context of the specied bytecode. 824 methodHandle LinkResolver::resolve_interface_method(const LinkInfo& link_info, Bytecodes::Code code, TRAPS) { 825 826 Klass* resolved_klass = link_info.resolved_klass(); 827 828 // check if klass is interface 829 if (!resolved_klass->is_interface()) { 830 ResourceMark rm(THREAD); 831 char buf[200]; 832 jio_snprintf(buf, sizeof(buf), "Found class %s, but interface was expected", resolved_klass->external_name()); 833 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 834 } 835 836 // check constant pool tag for called method - must be JVM_CONSTANT_InterfaceMethodref 837 if (!link_info.tag().is_invalid() && !link_info.tag().is_interface_method()) { 838 ResourceMark rm(THREAD); 839 stringStream ss; 840 ss.print("Method '"); 841 Method::print_external_name(&ss, link_info.resolved_klass(), link_info.name(), link_info.signature()); 842 ss.print("' must be InterfaceMethodref constant"); 843 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string()); 844 } 845 846 // lookup method in this interface or its super, java.lang.Object 847 // JDK8: also look for static methods 848 methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, false, true)); 849 850 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) { 851 // lookup method in all the super-interfaces 852 resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info)); 853 } 854 855 if (resolved_method.is_null()) { 856 // no method found 857 ResourceMark rm(THREAD); 858 stringStream ss; 859 ss.print("'"); 860 Method::print_external_name(&ss, resolved_klass, link_info.name(), link_info.signature()); 861 ss.print("'"); 862 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), ss.as_string()); 863 } 864 865 if (link_info.check_access()) { 866 // JDK8 adds non-public interface methods, and accessability check requirement 867 Klass* current_klass = link_info.current_klass(); 868 869 assert(current_klass != NULL , "current_klass should not be null"); 870 871 // check if method can be accessed by the referring class 872 check_method_accessability(current_klass, 873 resolved_klass, 874 resolved_method->method_holder(), 875 resolved_method, 876 CHECK_NULL); 877 878 check_method_loader_constraints(link_info, resolved_method, "interface method", CHECK_NULL); 879 } 880 881 if (code != Bytecodes::_invokestatic && resolved_method->is_static()) { 882 ResourceMark rm(THREAD); 883 stringStream ss; 884 ss.print("Expected instance not static method '"); 885 Method::print_external_name(&ss, resolved_klass, 886 resolved_method->name(), resolved_method->signature()); 887 ss.print("'"); 888 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string()); 889 } 890 891 if (log_develop_is_enabled(Trace, itables)) { 892 char buf[200]; 893 jio_snprintf(buf, sizeof(buf), "%s resolved interface method: caller-class:", 894 Bytecodes::name(code)); 895 trace_method_resolution(buf, link_info.current_klass(), resolved_klass, 896 resolved_method, true); 897 } 898 899 return resolved_method; 900 } 901 902 //------------------------------------------------------------------------------------------------------------------------ 903 // Field resolution 904 905 void LinkResolver::check_field_accessability(Klass* ref_klass, 906 Klass* resolved_klass, 907 Klass* sel_klass, 908 const fieldDescriptor& fd, 909 TRAPS) { 910 bool can_access = Reflection::verify_member_access(ref_klass, 911 resolved_klass, 912 sel_klass, 913 fd.access_flags(), 914 true, false, CHECK); 915 // Any existing exceptions that may have been thrown, for example LinkageErrors 916 // from nest-host resolution, have been allowed to propagate. 917 if (!can_access) { 918 bool same_module = (sel_klass->module() == ref_klass->module()); 919 ResourceMark rm(THREAD); 920 Exceptions::fthrow( 921 THREAD_AND_LOCATION, 922 vmSymbols::java_lang_IllegalAccessError(), 923 "class %s tried to access %s%sfield %s.%s (%s%s%s)", 924 ref_klass->external_name(), 925 fd.is_protected() ? "protected " : "", 926 fd.is_private() ? "private " : "", 927 sel_klass->external_name(), 928 fd.name()->as_C_string(), 929 (same_module) ? ref_klass->joint_in_module_of_loader(sel_klass) : ref_klass->class_in_module_of_loader(), 930 (same_module) ? "" : "; ", 931 (same_module) ? "" : sel_klass->class_in_module_of_loader() 932 ); 933 return; 934 } 935 } 936 937 void LinkResolver::resolve_field_access(fieldDescriptor& fd, const constantPoolHandle& pool, int index, const methodHandle& method, Bytecodes::Code byte, TRAPS) { 938 LinkInfo link_info(pool, index, method, CHECK); 939 resolve_field(fd, link_info, byte, true, CHECK); 940 } 941 942 void LinkResolver::resolve_field(fieldDescriptor& fd, 943 const LinkInfo& link_info, 944 Bytecodes::Code byte, bool initialize_class, 945 TRAPS) { 946 assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic || 947 byte == Bytecodes::_getfield || byte == Bytecodes::_putfield || 948 byte == Bytecodes::_withfield || 949 byte == Bytecodes::_nofast_getfield || byte == Bytecodes::_nofast_putfield || 950 (byte == Bytecodes::_nop && !link_info.check_access()), "bad field access bytecode"); 951 952 bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic); 953 bool is_put = (byte == Bytecodes::_putfield || byte == Bytecodes::_putstatic || 954 byte == Bytecodes::_nofast_putfield || byte == Bytecodes::_withfield); 955 // Check if there's a resolved klass containing the field 956 Klass* resolved_klass = link_info.resolved_klass(); 957 Symbol* field = link_info.name(); 958 Symbol* sig = link_info.signature(); 959 960 if (resolved_klass == NULL) { 961 ResourceMark rm(THREAD); 962 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string()); 963 } 964 965 // Resolve instance field 966 Klass* sel_klass = resolved_klass->find_field(field, sig, &fd); 967 // check if field exists; i.e., if a klass containing the field def has been selected 968 if (sel_klass == NULL) { 969 ResourceMark rm(THREAD); 970 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string()); 971 } 972 973 // Access checking may be turned off when calling from within the VM. 974 Klass* current_klass = link_info.current_klass(); 975 if (link_info.check_access()) { 976 977 // check access 978 check_field_accessability(current_klass, resolved_klass, sel_klass, fd, CHECK); 979 980 // check for errors 981 if (is_static != fd.is_static()) { 982 ResourceMark rm(THREAD); 983 char msg[200]; 984 jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string()); 985 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg); 986 } 987 988 // A final field can be modified only 989 // (1) by methods declared in the class declaring the field and 990 // (2) by the <clinit> method (in case of a static field) 991 // or by the <init> method (in case of an instance field). 992 // (3) by withfield when field is in a value type and the 993 // selected class and current class are nest mates. 994 if (is_put && fd.access_flags().is_final()) { 995 ResourceMark rm(THREAD); 996 stringStream ss; 997 998 if (sel_klass != current_klass) { 999 // If byte code is a withfield check if they are nestmates. 1000 bool are_nestmates = false; 1001 if (sel_klass->is_instance_klass() && 1002 InstanceKlass::cast(sel_klass)->is_value() && 1003 current_klass->is_instance_klass()) { 1004 are_nestmates = InstanceKlass::cast(link_info.current_klass())->has_nestmate_access_to( 1005 InstanceKlass::cast(sel_klass), THREAD); 1006 } 1007 if (!are_nestmates) { 1008 ss.print("Update to %s final field %s.%s attempted from a different class (%s) than the field's declaring class", 1009 is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(), 1010 current_klass->external_name()); 1011 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string()); 1012 } 1013 } 1014 1015 if (fd.constants()->pool_holder()->major_version() >= 53) { 1016 methodHandle m = link_info.current_method(); 1017 assert(!m.is_null(), "information about the current method must be available for 'put' bytecodes"); 1018 bool is_initialized_static_final_update = (byte == Bytecodes::_putstatic && 1019 fd.is_static() && 1020 !m()->is_class_initializer()); 1021 bool is_initialized_instance_final_update = ((byte == Bytecodes::_putfield || byte == Bytecodes::_nofast_putfield) && 1022 !fd.is_static() && 1023 !m->is_object_constructor()); 1024 1025 if (is_initialized_static_final_update || is_initialized_instance_final_update) { 1026 ss.print("Update to %s final field %s.%s attempted from a different method (%s) than the initializer method %s ", 1027 is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(), 1028 m()->name()->as_C_string(), 1029 is_static ? "<clinit>" : "<init>"); 1030 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string()); 1031 } 1032 } 1033 } 1034 1035 // initialize resolved_klass if necessary 1036 // note 1: the klass which declared the field must be initialized (i.e, sel_klass) 1037 // according to the newest JVM spec (5.5, p.170) - was bug (gri 7/28/99) 1038 // 1039 // note 2: we don't want to force initialization if we are just checking 1040 // if the field access is legal; e.g., during compilation 1041 if (is_static && initialize_class) { 1042 sel_klass->initialize(CHECK); 1043 } 1044 } 1045 1046 if ((sel_klass != current_klass) && (current_klass != NULL)) { 1047 check_field_loader_constraints(field, sig, current_klass, sel_klass, CHECK); 1048 } 1049 1050 // return information. note that the klass is set to the actual klass containing the 1051 // field, otherwise access of static fields in superclasses will not work. 1052 } 1053 1054 1055 //------------------------------------------------------------------------------------------------------------------------ 1056 // Invoke resolution 1057 // 1058 // Naming conventions: 1059 // 1060 // resolved_method the specified method (i.e., static receiver specified via constant pool index) 1061 // sel_method the selected method (selected via run-time lookup; e.g., based on dynamic receiver class) 1062 // resolved_klass the specified klass (i.e., specified via constant pool index) 1063 // recv_klass the receiver klass 1064 1065 1066 void LinkResolver::resolve_static_call(CallInfo& result, 1067 const LinkInfo& link_info, 1068 bool initialize_class, TRAPS) { 1069 methodHandle resolved_method = linktime_resolve_static_method(link_info, CHECK); 1070 1071 // The resolved class can change as a result of this resolution. 1072 Klass* resolved_klass = resolved_method->method_holder(); 1073 1074 // Initialize klass (this should only happen if everything is ok) 1075 if (initialize_class && resolved_klass->should_be_initialized()) { 1076 resolved_klass->initialize(CHECK); 1077 // Use updated LinkInfo to reresolve with resolved method holder 1078 LinkInfo new_info(resolved_klass, link_info.name(), link_info.signature(), 1079 link_info.current_klass(), 1080 link_info.check_access() ? LinkInfo::needs_access_check : LinkInfo::skip_access_check); 1081 resolved_method = linktime_resolve_static_method(new_info, CHECK); 1082 } 1083 1084 // setup result 1085 result.set_static(resolved_klass, resolved_method, CHECK); 1086 } 1087 1088 // throws linktime exceptions 1089 methodHandle LinkResolver::linktime_resolve_static_method(const LinkInfo& link_info, TRAPS) { 1090 1091 Klass* resolved_klass = link_info.resolved_klass(); 1092 methodHandle resolved_method; 1093 if (!resolved_klass->is_interface()) { 1094 resolved_method = resolve_method(link_info, Bytecodes::_invokestatic, CHECK_NULL); 1095 } else { 1096 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokestatic, CHECK_NULL); 1097 } 1098 assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier"); 1099 1100 // check if static 1101 if (!resolved_method->is_static()) { 1102 ResourceMark rm(THREAD); 1103 stringStream ss; 1104 ss.print("Expected static method '"); 1105 resolved_method()->print_external_name(&ss); 1106 ss.print("'"); 1107 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string()); 1108 } 1109 return resolved_method; 1110 } 1111 1112 1113 void LinkResolver::resolve_special_call(CallInfo& result, 1114 Handle recv, 1115 const LinkInfo& link_info, 1116 TRAPS) { 1117 methodHandle resolved_method = linktime_resolve_special_method(link_info, CHECK); 1118 runtime_resolve_special_method(result, link_info, resolved_method, recv, CHECK); 1119 } 1120 1121 // throws linktime exceptions 1122 methodHandle LinkResolver::linktime_resolve_special_method(const LinkInfo& link_info, 1123 TRAPS) { 1124 1125 // Invokespecial is called for multiple special reasons: 1126 // <init> 1127 // local private method invocation, for classes and interfaces 1128 // superclass.method, which can also resolve to a default method 1129 // and the selected method is recalculated relative to the direct superclass 1130 // superinterface.method, which explicitly does not check shadowing 1131 Klass* resolved_klass = link_info.resolved_klass(); 1132 methodHandle resolved_method; 1133 1134 if (!resolved_klass->is_interface()) { 1135 resolved_method = resolve_method(link_info, Bytecodes::_invokespecial, CHECK_NULL); 1136 } else { 1137 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokespecial, CHECK_NULL); 1138 } 1139 1140 // check if method name is <init>, that it is found in same klass as static type 1141 // Since this method is never inherited from a super, any appearance here under 1142 // the wrong class would be an error. 1143 if (resolved_method->name() == vmSymbols::object_initializer_name() && 1144 resolved_method->method_holder() != resolved_klass) { 1145 ResourceMark rm(THREAD); 1146 stringStream ss; 1147 ss.print("%s: method '", resolved_klass->external_name()); 1148 resolved_method->signature()->print_as_signature_external_return_type(&ss); 1149 ss.print(" %s(", resolved_method->name()->as_C_string()); 1150 resolved_method->signature()->print_as_signature_external_parameters(&ss); 1151 ss.print(")' not found"); 1152 Exceptions::fthrow( 1153 THREAD_AND_LOCATION, 1154 vmSymbols::java_lang_NoSuchMethodError(), 1155 "%s", ss.as_string()); 1156 return NULL; 1157 } 1158 1159 // ensure that invokespecial's interface method reference is in 1160 // a direct superinterface, not an indirect superinterface 1161 Klass* current_klass = link_info.current_klass(); 1162 if (current_klass != NULL && resolved_klass->is_interface()) { 1163 InstanceKlass* ck = InstanceKlass::cast(current_klass); 1164 InstanceKlass *klass_to_check = !ck->is_unsafe_anonymous() ? 1165 ck : 1166 ck->unsafe_anonymous_host(); 1167 // Disable verification for the dynamically-generated reflection bytecodes. 1168 bool is_reflect = klass_to_check->is_subclass_of( 1169 SystemDictionary::reflect_MagicAccessorImpl_klass()); 1170 1171 if (!is_reflect && 1172 !klass_to_check->is_same_or_direct_interface(resolved_klass)) { 1173 ResourceMark rm(THREAD); 1174 stringStream ss; 1175 ss.print("Interface method reference: '"); 1176 resolved_method->print_external_name(&ss); 1177 ss.print("', is in an indirect superinterface of %s", 1178 current_klass->external_name()); 1179 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string()); 1180 } 1181 } 1182 1183 // check if not static 1184 if (resolved_method->is_static()) { 1185 ResourceMark rm(THREAD); 1186 stringStream ss; 1187 ss.print("Expecting non-static method '"); 1188 resolved_method->print_external_name(&ss); 1189 ss.print("'"); 1190 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string()); 1191 } 1192 1193 if (log_develop_is_enabled(Trace, itables)) { 1194 trace_method_resolution("invokespecial resolved method: caller-class:", 1195 current_klass, resolved_klass, resolved_method, true); 1196 } 1197 1198 return resolved_method; 1199 } 1200 1201 // throws runtime exceptions 1202 void LinkResolver::runtime_resolve_special_method(CallInfo& result, 1203 const LinkInfo& link_info, 1204 const methodHandle& resolved_method, 1205 Handle recv, TRAPS) { 1206 1207 Klass* resolved_klass = link_info.resolved_klass(); 1208 1209 // resolved method is selected method unless we have an old-style lookup 1210 // for a superclass method 1211 // Invokespecial for a superinterface, resolved method is selected method, 1212 // no checks for shadowing 1213 methodHandle sel_method(THREAD, resolved_method()); 1214 1215 if (link_info.check_access() && 1216 // check if the method is not <init>, which is never inherited 1217 resolved_method->name() != vmSymbols::object_initializer_name()) { 1218 1219 Klass* current_klass = link_info.current_klass(); 1220 1221 // Check if the class of the resolved_klass is a superclass 1222 // (not supertype in order to exclude interface classes) of the current class. 1223 // This check is not performed for super.invoke for interface methods 1224 // in super interfaces. 1225 if (current_klass->is_subclass_of(resolved_klass) && 1226 current_klass != resolved_klass) { 1227 // Lookup super method 1228 Klass* super_klass = current_klass->super(); 1229 sel_method = lookup_instance_method_in_klasses(super_klass, 1230 resolved_method->name(), 1231 resolved_method->signature(), 1232 Klass::find_private, CHECK); 1233 // check if found 1234 if (sel_method.is_null()) { 1235 ResourceMark rm(THREAD); 1236 stringStream ss; 1237 ss.print("'"); 1238 resolved_method->print_external_name(&ss); 1239 ss.print("'"); 1240 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string()); 1241 // check loader constraints if found a different method 1242 } else if (sel_method() != resolved_method()) { 1243 check_method_loader_constraints(link_info, sel_method, "method", CHECK); 1244 } 1245 } 1246 1247 // Check that the class of objectref (the receiver) is the current class or interface, 1248 // or a subtype of the current class or interface (the sender), otherwise invokespecial 1249 // throws IllegalAccessError. 1250 // The verifier checks that the sender is a subtype of the class in the I/MR operand. 1251 // The verifier also checks that the receiver is a subtype of the sender, if the sender is 1252 // a class. If the sender is an interface, the check has to be performed at runtime. 1253 InstanceKlass* sender = InstanceKlass::cast(current_klass); 1254 sender = sender->is_unsafe_anonymous() ? sender->unsafe_anonymous_host() : sender; 1255 if (sender->is_interface() && recv.not_null()) { 1256 Klass* receiver_klass = recv->klass(); 1257 if (!receiver_klass->is_subtype_of(sender)) { 1258 ResourceMark rm(THREAD); 1259 char buf[500]; 1260 jio_snprintf(buf, sizeof(buf), 1261 "Receiver class %s must be the current class or a subtype of interface %s", 1262 receiver_klass->external_name(), 1263 sender->external_name()); 1264 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), buf); 1265 } 1266 } 1267 } 1268 1269 // check if not static 1270 if (sel_method->is_static()) { 1271 ResourceMark rm(THREAD); 1272 stringStream ss; 1273 ss.print("Expecting non-static method '"); 1274 resolved_method->print_external_name(&ss); 1275 ss.print("'"); 1276 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string()); 1277 } 1278 1279 // check if abstract 1280 if (sel_method->is_abstract()) { 1281 ResourceMark rm(THREAD); 1282 stringStream ss; 1283 ss.print("'"); 1284 Method::print_external_name(&ss, resolved_klass, sel_method->name(), sel_method->signature()); 1285 ss.print("'"); 1286 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string()); 1287 } 1288 1289 if (log_develop_is_enabled(Trace, itables)) { 1290 trace_method_resolution("invokespecial selected method: resolved-class:", 1291 resolved_klass, resolved_klass, sel_method, true); 1292 } 1293 1294 // setup result 1295 result.set_static(resolved_klass, sel_method, CHECK); 1296 } 1297 1298 void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, Klass* receiver_klass, 1299 const LinkInfo& link_info, 1300 bool check_null_and_abstract, TRAPS) { 1301 methodHandle resolved_method = linktime_resolve_virtual_method(link_info, CHECK); 1302 runtime_resolve_virtual_method(result, resolved_method, 1303 link_info.resolved_klass(), 1304 recv, receiver_klass, 1305 check_null_and_abstract, CHECK); 1306 } 1307 1308 // throws linktime exceptions 1309 methodHandle LinkResolver::linktime_resolve_virtual_method(const LinkInfo& link_info, 1310 TRAPS) { 1311 // normal method resolution 1312 methodHandle resolved_method = resolve_method(link_info, Bytecodes::_invokevirtual, CHECK_NULL); 1313 1314 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier"); 1315 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier"); 1316 1317 // check if private interface method 1318 Klass* resolved_klass = link_info.resolved_klass(); 1319 Klass* current_klass = link_info.current_klass(); 1320 1321 // This is impossible, if resolve_klass is an interface, we've thrown icce in resolve_method 1322 if (resolved_klass->is_interface() && resolved_method->is_private()) { 1323 ResourceMark rm(THREAD); 1324 stringStream ss; 1325 ss.print("private interface method requires invokespecial, not invokevirtual: method '"); 1326 resolved_method->print_external_name(&ss); 1327 ss.print("', caller-class: %s", 1328 (current_klass == NULL ? "<null>" : current_klass->internal_name())); 1329 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string()); 1330 } 1331 1332 // check if not static 1333 if (resolved_method->is_static()) { 1334 ResourceMark rm(THREAD); 1335 stringStream ss; 1336 ss.print("Expecting non-static method '"); 1337 resolved_method->print_external_name(&ss); 1338 ss.print("'"); 1339 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string()); 1340 } 1341 1342 if (log_develop_is_enabled(Trace, vtables)) { 1343 trace_method_resolution("invokevirtual resolved method: caller-class:", 1344 current_klass, resolved_klass, resolved_method, false); 1345 } 1346 1347 return resolved_method; 1348 } 1349 1350 // throws runtime exceptions 1351 void LinkResolver::runtime_resolve_virtual_method(CallInfo& result, 1352 const methodHandle& resolved_method, 1353 Klass* resolved_klass, 1354 Handle recv, 1355 Klass* recv_klass, 1356 bool check_null_and_abstract, 1357 TRAPS) { 1358 1359 // setup default return values 1360 int vtable_index = Method::invalid_vtable_index; 1361 methodHandle selected_method; 1362 1363 // runtime method resolution 1364 if (check_null_and_abstract && recv.is_null()) { // check if receiver exists 1365 THROW(vmSymbols::java_lang_NullPointerException()); 1366 } 1367 1368 // Virtual methods cannot be resolved before its klass has been linked, for otherwise the Method*'s 1369 // has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since 1370 // a missing receiver might result in a bogus lookup. 1371 assert(resolved_method->method_holder()->is_linked(), "must be linked"); 1372 1373 // do lookup based on receiver klass using the vtable index 1374 if (resolved_method->method_holder()->is_interface()) { // default or miranda method 1375 vtable_index = vtable_index_of_interface_method(resolved_klass, resolved_method); 1376 assert(vtable_index >= 0 , "we should have valid vtable index at this point"); 1377 1378 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index)); 1379 } else { 1380 // at this point we are sure that resolved_method is virtual and not 1381 // a default or miranda method; therefore, it must have a valid vtable index. 1382 assert(!resolved_method->has_itable_index(), ""); 1383 vtable_index = resolved_method->vtable_index(); 1384 // We could get a negative vtable_index of nonvirtual_vtable_index for private 1385 // methods, or for final methods. Private methods never appear in the vtable 1386 // and never override other methods. As an optimization, final methods are 1387 // never put in the vtable, unless they override an existing method. 1388 // So if we do get nonvirtual_vtable_index, it means the selected method is the 1389 // resolved method, and it can never be changed by an override. 1390 if (vtable_index == Method::nonvirtual_vtable_index) { 1391 assert(resolved_method->can_be_statically_bound(), "cannot override this method"); 1392 selected_method = resolved_method; 1393 } else { 1394 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index)); 1395 } 1396 } 1397 1398 // check if method exists 1399 if (selected_method.is_null()) { 1400 throw_abstract_method_error(resolved_method, recv_klass, CHECK); 1401 } 1402 1403 // check if abstract 1404 if (check_null_and_abstract && selected_method->is_abstract()) { 1405 // Pass arguments for generating a verbose error message. 1406 throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK); 1407 } 1408 1409 if (log_develop_is_enabled(Trace, vtables)) { 1410 trace_method_resolution("invokevirtual selected method: receiver-class:", 1411 recv_klass, resolved_klass, selected_method, 1412 false, vtable_index); 1413 } 1414 // setup result 1415 result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK); 1416 } 1417 1418 void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, Klass* recv_klass, 1419 const LinkInfo& link_info, 1420 bool check_null_and_abstract, TRAPS) { 1421 // throws linktime exceptions 1422 methodHandle resolved_method = linktime_resolve_interface_method(link_info, CHECK); 1423 runtime_resolve_interface_method(result, resolved_method,link_info.resolved_klass(), 1424 recv, recv_klass, check_null_and_abstract, CHECK); 1425 } 1426 1427 methodHandle LinkResolver::linktime_resolve_interface_method(const LinkInfo& link_info, 1428 TRAPS) { 1429 // normal interface method resolution 1430 methodHandle resolved_method = resolve_interface_method(link_info, Bytecodes::_invokeinterface, CHECK_NULL); 1431 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier"); 1432 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier"); 1433 1434 return resolved_method; 1435 } 1436 1437 // throws runtime exceptions 1438 void LinkResolver::runtime_resolve_interface_method(CallInfo& result, 1439 const methodHandle& resolved_method, 1440 Klass* resolved_klass, 1441 Handle recv, 1442 Klass* recv_klass, 1443 bool check_null_and_abstract, TRAPS) { 1444 1445 // check if receiver exists 1446 if (check_null_and_abstract && recv.is_null()) { 1447 THROW(vmSymbols::java_lang_NullPointerException()); 1448 } 1449 1450 // check if receiver klass implements the resolved interface 1451 if (!recv_klass->is_subtype_of(resolved_klass)) { 1452 ResourceMark rm(THREAD); 1453 char buf[200]; 1454 jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s", 1455 recv_klass->external_name(), 1456 resolved_klass->external_name()); 1457 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1458 } 1459 1460 methodHandle selected_method = resolved_method; 1461 1462 // resolve the method in the receiver class, unless it is private 1463 if (!resolved_method()->is_private()) { 1464 // do lookup based on receiver klass 1465 // This search must match the linktime preparation search for itable initialization 1466 // to correctly enforce loader constraints for interface method inheritance. 1467 // Private methods are skipped as the resolved method was not private. 1468 selected_method = lookup_instance_method_in_klasses(recv_klass, 1469 resolved_method->name(), 1470 resolved_method->signature(), 1471 Klass::skip_private, CHECK); 1472 1473 if (selected_method.is_null() && !check_null_and_abstract) { 1474 // In theory this is a harmless placeholder value, but 1475 // in practice leaving in null affects the nsk default method tests. 1476 // This needs further study. 1477 selected_method = resolved_method; 1478 } 1479 // check if method exists 1480 if (selected_method.is_null()) { 1481 // Pass arguments for generating a verbose error message. 1482 throw_abstract_method_error(resolved_method, recv_klass, CHECK); 1483 } 1484 // check access 1485 // Throw Illegal Access Error if selected_method is not public. 1486 if (!selected_method->is_public()) { 1487 ResourceMark rm(THREAD); 1488 stringStream ss; 1489 ss.print("'"); 1490 Method::print_external_name(&ss, recv_klass, selected_method->name(), selected_method->signature()); 1491 ss.print("'"); 1492 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string()); 1493 } 1494 // check if abstract 1495 if (check_null_and_abstract && selected_method->is_abstract()) { 1496 throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK); 1497 } 1498 } 1499 1500 if (log_develop_is_enabled(Trace, itables)) { 1501 trace_method_resolution("invokeinterface selected method: receiver-class:", 1502 recv_klass, resolved_klass, selected_method, true); 1503 } 1504 // setup result 1505 if (resolved_method->has_vtable_index()) { 1506 int vtable_index = resolved_method->vtable_index(); 1507 log_develop_trace(itables)(" -- vtable index: %d", vtable_index); 1508 assert(vtable_index == selected_method->vtable_index(), "sanity check"); 1509 result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK); 1510 } else if (resolved_method->has_itable_index()) { 1511 int itable_index = resolved_method()->itable_index(); 1512 log_develop_trace(itables)(" -- itable index: %d", itable_index); 1513 result.set_interface(resolved_klass, recv_klass, resolved_method, selected_method, itable_index, CHECK); 1514 } else { 1515 int index = resolved_method->vtable_index(); 1516 log_develop_trace(itables)(" -- non itable/vtable index: %d", index); 1517 assert(index == Method::nonvirtual_vtable_index, "Oops hit another case!"); 1518 assert(resolved_method()->is_private() || 1519 (resolved_method()->is_final() && resolved_method->method_holder() == SystemDictionary::Object_klass()), 1520 "Should only have non-virtual invokeinterface for private or final-Object methods!"); 1521 assert(resolved_method()->can_be_statically_bound(), "Should only have non-virtual invokeinterface for statically bound methods!"); 1522 // This sets up the nonvirtual form of "virtual" call (as needed for final and private methods) 1523 result.set_virtual(resolved_klass, resolved_klass, resolved_method, resolved_method, index, CHECK); 1524 } 1525 } 1526 1527 1528 methodHandle LinkResolver::linktime_resolve_interface_method_or_null( 1529 const LinkInfo& link_info) { 1530 EXCEPTION_MARK; 1531 methodHandle method_result = linktime_resolve_interface_method(link_info, THREAD); 1532 if (HAS_PENDING_EXCEPTION) { 1533 CLEAR_PENDING_EXCEPTION; 1534 return methodHandle(); 1535 } else { 1536 return method_result; 1537 } 1538 } 1539 1540 methodHandle LinkResolver::linktime_resolve_virtual_method_or_null( 1541 const LinkInfo& link_info) { 1542 EXCEPTION_MARK; 1543 methodHandle method_result = linktime_resolve_virtual_method(link_info, THREAD); 1544 if (HAS_PENDING_EXCEPTION) { 1545 CLEAR_PENDING_EXCEPTION; 1546 return methodHandle(); 1547 } else { 1548 return method_result; 1549 } 1550 } 1551 1552 methodHandle LinkResolver::resolve_virtual_call_or_null( 1553 Klass* receiver_klass, 1554 const LinkInfo& link_info) { 1555 EXCEPTION_MARK; 1556 CallInfo info; 1557 resolve_virtual_call(info, Handle(), receiver_klass, link_info, false, THREAD); 1558 if (HAS_PENDING_EXCEPTION) { 1559 CLEAR_PENDING_EXCEPTION; 1560 return methodHandle(); 1561 } 1562 return info.selected_method(); 1563 } 1564 1565 methodHandle LinkResolver::resolve_interface_call_or_null( 1566 Klass* receiver_klass, 1567 const LinkInfo& link_info) { 1568 EXCEPTION_MARK; 1569 CallInfo info; 1570 resolve_interface_call(info, Handle(), receiver_klass, link_info, false, THREAD); 1571 if (HAS_PENDING_EXCEPTION) { 1572 CLEAR_PENDING_EXCEPTION; 1573 return methodHandle(); 1574 } 1575 return info.selected_method(); 1576 } 1577 1578 int LinkResolver::resolve_virtual_vtable_index(Klass* receiver_klass, 1579 const LinkInfo& link_info) { 1580 EXCEPTION_MARK; 1581 CallInfo info; 1582 resolve_virtual_call(info, Handle(), receiver_klass, link_info, 1583 /*check_null_or_abstract*/false, THREAD); 1584 if (HAS_PENDING_EXCEPTION) { 1585 CLEAR_PENDING_EXCEPTION; 1586 return Method::invalid_vtable_index; 1587 } 1588 return info.vtable_index(); 1589 } 1590 1591 methodHandle LinkResolver::resolve_static_call_or_null(const LinkInfo& link_info) { 1592 EXCEPTION_MARK; 1593 CallInfo info; 1594 resolve_static_call(info, link_info, /*initialize_class*/false, THREAD); 1595 if (HAS_PENDING_EXCEPTION) { 1596 CLEAR_PENDING_EXCEPTION; 1597 return methodHandle(); 1598 } 1599 return info.selected_method(); 1600 } 1601 1602 methodHandle LinkResolver::resolve_special_call_or_null(const LinkInfo& link_info) { 1603 EXCEPTION_MARK; 1604 CallInfo info; 1605 resolve_special_call(info, Handle(), link_info, THREAD); 1606 if (HAS_PENDING_EXCEPTION) { 1607 CLEAR_PENDING_EXCEPTION; 1608 return methodHandle(); 1609 } 1610 return info.selected_method(); 1611 } 1612 1613 1614 1615 //------------------------------------------------------------------------------------------------------------------------ 1616 // ConstantPool entries 1617 1618 void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) { 1619 switch (byte) { 1620 case Bytecodes::_invokestatic : resolve_invokestatic (result, pool, index, CHECK); break; 1621 case Bytecodes::_invokespecial : resolve_invokespecial (result, recv, pool, index, CHECK); break; 1622 case Bytecodes::_invokevirtual : resolve_invokevirtual (result, recv, pool, index, CHECK); break; 1623 case Bytecodes::_invokehandle : resolve_invokehandle (result, pool, index, CHECK); break; 1624 case Bytecodes::_invokedynamic : resolve_invokedynamic (result, pool, index, CHECK); break; 1625 case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break; 1626 default : break; 1627 } 1628 return; 1629 } 1630 1631 void LinkResolver::resolve_invoke(CallInfo& result, Handle& recv, 1632 const methodHandle& attached_method, 1633 Bytecodes::Code byte, TRAPS) { 1634 Klass* defc = attached_method->method_holder(); 1635 Symbol* name = attached_method->name(); 1636 Symbol* type = attached_method->signature(); 1637 LinkInfo link_info(defc, name, type); 1638 switch(byte) { 1639 case Bytecodes::_invokevirtual: 1640 resolve_virtual_call(result, recv, recv->klass(), link_info, 1641 /*check_null_and_abstract=*/true, CHECK); 1642 break; 1643 case Bytecodes::_invokeinterface: 1644 resolve_interface_call(result, recv, recv->klass(), link_info, 1645 /*check_null_and_abstract=*/true, CHECK); 1646 break; 1647 case Bytecodes::_invokestatic: 1648 resolve_static_call(result, link_info, /*initialize_class=*/false, CHECK); 1649 break; 1650 case Bytecodes::_invokespecial: 1651 resolve_special_call(result, recv, link_info, CHECK); 1652 break; 1653 default: 1654 fatal("bad call: %s", Bytecodes::name(byte)); 1655 break; 1656 } 1657 } 1658 1659 void LinkResolver::resolve_invokestatic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) { 1660 LinkInfo link_info(pool, index, CHECK); 1661 resolve_static_call(result, link_info, /*initialize_class*/true, CHECK); 1662 } 1663 1664 1665 void LinkResolver::resolve_invokespecial(CallInfo& result, Handle recv, 1666 const constantPoolHandle& pool, int index, TRAPS) { 1667 LinkInfo link_info(pool, index, CHECK); 1668 resolve_special_call(result, recv, link_info, CHECK); 1669 } 1670 1671 1672 void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv, 1673 const constantPoolHandle& pool, int index, 1674 TRAPS) { 1675 1676 LinkInfo link_info(pool, index, CHECK); 1677 Klass* recvrKlass = recv.is_null() ? (Klass*)NULL : recv->klass(); 1678 resolve_virtual_call(result, recv, recvrKlass, link_info, /*check_null_or_abstract*/true, CHECK); 1679 } 1680 1681 1682 void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, TRAPS) { 1683 LinkInfo link_info(pool, index, CHECK); 1684 Klass* recvrKlass = recv.is_null() ? (Klass*)NULL : recv->klass(); 1685 resolve_interface_call(result, recv, recvrKlass, link_info, true, CHECK); 1686 } 1687 1688 1689 void LinkResolver::resolve_invokehandle(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) { 1690 // This guy is reached from InterpreterRuntime::resolve_invokehandle. 1691 LinkInfo link_info(pool, index, CHECK); 1692 if (TraceMethodHandles) { 1693 ResourceMark rm(THREAD); 1694 tty->print_cr("resolve_invokehandle %s %s", link_info.name()->as_C_string(), 1695 link_info.signature()->as_C_string()); 1696 } 1697 resolve_handle_call(result, link_info, CHECK); 1698 } 1699 1700 void LinkResolver::resolve_handle_call(CallInfo& result, 1701 const LinkInfo& link_info, 1702 TRAPS) { 1703 // JSR 292: this must be an implicitly generated method MethodHandle.invokeExact(*...) or similar 1704 Klass* resolved_klass = link_info.resolved_klass(); 1705 assert(resolved_klass == SystemDictionary::MethodHandle_klass() || 1706 resolved_klass == SystemDictionary::VarHandle_klass(), ""); 1707 assert(MethodHandles::is_signature_polymorphic_name(link_info.name()), ""); 1708 Handle resolved_appendix; 1709 methodHandle resolved_method = lookup_polymorphic_method(link_info, &resolved_appendix, CHECK); 1710 result.set_handle(resolved_klass, resolved_method, resolved_appendix, CHECK); 1711 } 1712 1713 void LinkResolver::resolve_invokedynamic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) { 1714 Symbol* method_name = pool->name_ref_at(index); 1715 Symbol* method_signature = pool->signature_ref_at(index); 1716 Klass* current_klass = pool->pool_holder(); 1717 1718 // Resolve the bootstrap specifier (BSM + optional arguments). 1719 Handle bootstrap_specifier; 1720 // Check if CallSite has been bound already: 1721 ConstantPoolCacheEntry* cpce = pool->invokedynamic_cp_cache_entry_at(index); 1722 int pool_index = cpce->constant_pool_index(); 1723 1724 if (cpce->is_f1_null()) { 1725 if (cpce->indy_resolution_failed()) { 1726 ConstantPool::throw_resolution_error(pool, 1727 ResolutionErrorTable::encode_cpcache_index(index), 1728 CHECK); 1729 } 1730 1731 // The initial step in Call Site Specifier Resolution is to resolve the symbolic 1732 // reference to a method handle which will be the bootstrap method for a dynamic 1733 // call site. If resolution for the java.lang.invoke.MethodHandle for the bootstrap 1734 // method fails, then a MethodHandleInError is stored at the corresponding bootstrap 1735 // method's CP index for the CONSTANT_MethodHandle_info. So, there is no need to 1736 // set the indy_rf flag since any subsequent invokedynamic instruction which shares 1737 // this bootstrap method will encounter the resolution of MethodHandleInError. 1738 oop bsm_info = pool->resolve_bootstrap_specifier_at(pool_index, THREAD); 1739 Exceptions::wrap_dynamic_exception(CHECK); 1740 assert(bsm_info != NULL, ""); 1741 // FIXME: Cache this once per BootstrapMethods entry, not once per CONSTANT_InvokeDynamic. 1742 bootstrap_specifier = Handle(THREAD, bsm_info); 1743 } 1744 if (!cpce->is_f1_null()) { 1745 methodHandle method( THREAD, cpce->f1_as_method()); 1746 Handle appendix( THREAD, cpce->appendix_if_resolved(pool)); 1747 result.set_handle(method, appendix, THREAD); 1748 Exceptions::wrap_dynamic_exception(CHECK); 1749 return; 1750 } 1751 1752 if (TraceMethodHandles) { 1753 ResourceMark rm(THREAD); 1754 tty->print_cr("resolve_invokedynamic #%d %s %s in %s", 1755 ConstantPool::decode_invokedynamic_index(index), 1756 method_name->as_C_string(), method_signature->as_C_string(), 1757 current_klass->name()->as_C_string()); 1758 tty->print(" BSM info: "); bootstrap_specifier->print(); 1759 } 1760 1761 resolve_dynamic_call(result, pool_index, bootstrap_specifier, method_name, 1762 method_signature, current_klass, THREAD); 1763 if (HAS_PENDING_EXCEPTION && PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { 1764 int encoded_index = ResolutionErrorTable::encode_cpcache_index(index); 1765 bool recorded_res_status = cpce->save_and_throw_indy_exc(pool, pool_index, 1766 encoded_index, 1767 pool()->tag_at(pool_index), 1768 CHECK); 1769 if (!recorded_res_status) { 1770 // Another thread got here just before we did. So, either use the method 1771 // that it resolved or throw the LinkageError exception that it threw. 1772 if (!cpce->is_f1_null()) { 1773 methodHandle method( THREAD, cpce->f1_as_method()); 1774 Handle appendix( THREAD, cpce->appendix_if_resolved(pool)); 1775 result.set_handle(method, appendix, THREAD); 1776 Exceptions::wrap_dynamic_exception(CHECK); 1777 } else { 1778 assert(cpce->indy_resolution_failed(), "Resolution failure flag not set"); 1779 ConstantPool::throw_resolution_error(pool, encoded_index, CHECK); 1780 } 1781 return; 1782 } 1783 assert(cpce->indy_resolution_failed(), "Resolution failure flag wasn't set"); 1784 } 1785 } 1786 1787 void LinkResolver::resolve_dynamic_call(CallInfo& result, 1788 int pool_index, 1789 Handle bootstrap_specifier, 1790 Symbol* method_name, Symbol* method_signature, 1791 Klass* current_klass, 1792 TRAPS) { 1793 // JSR 292: this must resolve to an implicitly generated method MH.linkToCallSite(*...) 1794 // The appendix argument is likely to be a freshly-created CallSite. 1795 Handle resolved_appendix; 1796 methodHandle resolved_method = 1797 SystemDictionary::find_dynamic_call_site_invoker(current_klass, 1798 pool_index, 1799 bootstrap_specifier, 1800 method_name, method_signature, 1801 &resolved_appendix, 1802 THREAD); 1803 Exceptions::wrap_dynamic_exception(CHECK); 1804 result.set_handle(resolved_method, resolved_appendix, THREAD); 1805 Exceptions::wrap_dynamic_exception(CHECK); 1806 } 1807 1808 // Selected method is abstract. 1809 void LinkResolver::throw_abstract_method_error(const methodHandle& resolved_method, 1810 const methodHandle& selected_method, 1811 Klass *recv_klass, TRAPS) { 1812 Klass *resolved_klass = resolved_method->method_holder(); 1813 ResourceMark rm(THREAD); 1814 stringStream ss; 1815 1816 if (recv_klass != NULL) { 1817 ss.print("Receiver class %s does not define or inherit an " 1818 "implementation of the", 1819 recv_klass->external_name()); 1820 } else { 1821 ss.print("Missing implementation of"); 1822 } 1823 1824 assert(resolved_method.not_null(), "Sanity"); 1825 ss.print(" resolved method '%s%s", 1826 resolved_method->is_abstract() ? "abstract " : "", 1827 resolved_method->is_private() ? "private " : ""); 1828 resolved_method->signature()->print_as_signature_external_return_type(&ss); 1829 ss.print(" %s(", resolved_method->name()->as_C_string()); 1830 resolved_method->signature()->print_as_signature_external_parameters(&ss); 1831 ss.print(")' of %s %s.", 1832 resolved_klass->external_kind(), 1833 resolved_klass->external_name()); 1834 1835 if (selected_method.not_null() && !(resolved_method == selected_method)) { 1836 ss.print(" Selected method is '%s%s", 1837 selected_method->is_abstract() ? "abstract " : "", 1838 selected_method->is_private() ? "private " : ""); 1839 selected_method->print_external_name(&ss); 1840 ss.print("'."); 1841 } 1842 1843 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string()); 1844 }