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.inline.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 a 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 bool same_module = (base_klass->module() == ref_klass->module()); 310 if (msg == NULL) { 311 Exceptions::fthrow( 312 THREAD_AND_LOCATION, 313 vmSymbols::java_lang_IllegalAccessError(), 314 "failed to access class %s from class %s (%s%s%s)", 315 base_klass->external_name(), 316 ref_klass->external_name(), 317 (same_module) ? base_klass->joint_in_module_of_loader(ref_klass) : base_klass->class_in_module_of_loader(), 318 (same_module) ? "" : "; ", 319 (same_module) ? "" : ref_klass->class_in_module_of_loader()); 320 } else { 321 // Use module specific message returned by verify_class_access_msg(). 322 Exceptions::fthrow( 323 THREAD_AND_LOCATION, 324 vmSymbols::java_lang_IllegalAccessError(), 325 "%s", msg); 326 } 327 } 328 } 329 330 //------------------------------------------------------------------------------------------------------------------------ 331 // Method resolution 332 // 333 // According to JVM spec. $5.4.3c & $5.4.3d 334 335 // Look up method in klasses, including static methods 336 // Then look up local default methods 337 Method* LinkResolver::lookup_method_in_klasses(const LinkInfo& link_info, 338 bool checkpolymorphism, 339 bool in_imethod_resolve) { 340 NoSafepointVerifier nsv; // Method* returned may not be reclaimed 341 342 Klass* klass = link_info.resolved_klass(); 343 Symbol* name = link_info.name(); 344 Symbol* signature = link_info.signature(); 345 346 // Ignore overpasses so statics can be found during resolution 347 Method* result = klass->uncached_lookup_method(name, signature, Klass::skip_overpass); 348 349 if (klass->is_array_klass()) { 350 // Only consider klass and super klass for arrays 351 return result; 352 } 353 354 InstanceKlass* ik = InstanceKlass::cast(klass); 355 356 // JDK 8, JVMS 5.4.3.4: Interface method resolution should 357 // ignore static and non-public methods of java.lang.Object, 358 // like clone, finalize, registerNatives. 359 if (in_imethod_resolve && 360 result != NULL && 361 ik->is_interface() && 362 (result->is_static() || !result->is_public()) && 363 result->method_holder() == SystemDictionary::Object_klass()) { 364 result = NULL; 365 } 366 367 // Before considering default methods, check for an overpass in the 368 // current class if a method has not been found. 369 if (result == NULL) { 370 result = ik->find_method(name, signature); 371 } 372 373 if (result == NULL) { 374 Array<Method*>* default_methods = ik->default_methods(); 375 if (default_methods != NULL) { 376 result = InstanceKlass::find_method(default_methods, name, signature); 377 } 378 } 379 380 if (checkpolymorphism && result != NULL) { 381 vmIntrinsics::ID iid = result->intrinsic_id(); 382 if (MethodHandles::is_signature_polymorphic(iid)) { 383 // Do not link directly to these. The VM must produce a synthetic one using lookup_polymorphic_method. 384 return NULL; 385 } 386 } 387 return result; 388 } 389 390 // returns first instance method 391 // Looks up method in classes, then looks up local default methods 392 methodHandle LinkResolver::lookup_instance_method_in_klasses(Klass* klass, 393 Symbol* name, 394 Symbol* signature, 395 Klass::PrivateLookupMode private_mode, TRAPS) { 396 Method* result = klass->uncached_lookup_method(name, signature, Klass::find_overpass, private_mode); 397 398 while (result != NULL && result->is_static() && result->method_holder()->super() != NULL) { 399 Klass* super_klass = result->method_holder()->super(); 400 result = super_klass->uncached_lookup_method(name, signature, Klass::find_overpass, private_mode); 401 } 402 403 if (klass->is_array_klass()) { 404 // Only consider klass and super klass for arrays 405 return methodHandle(THREAD, result); 406 } 407 408 if (result == NULL) { 409 Array<Method*>* default_methods = InstanceKlass::cast(klass)->default_methods(); 410 if (default_methods != NULL) { 411 result = InstanceKlass::find_method(default_methods, name, signature); 412 assert(result == NULL || !result->is_static(), "static defaults not allowed"); 413 } 414 } 415 return methodHandle(THREAD, result); 416 } 417 418 int LinkResolver::vtable_index_of_interface_method(Klass* klass, 419 const methodHandle& resolved_method) { 420 421 int vtable_index = Method::invalid_vtable_index; 422 Symbol* name = resolved_method->name(); 423 Symbol* signature = resolved_method->signature(); 424 InstanceKlass* ik = InstanceKlass::cast(klass); 425 426 // First check in default method array 427 if (!resolved_method->is_abstract() && ik->default_methods() != NULL) { 428 int index = InstanceKlass::find_method_index(ik->default_methods(), 429 name, signature, Klass::find_overpass, 430 Klass::find_static, Klass::find_private); 431 if (index >= 0 ) { 432 vtable_index = ik->default_vtable_indices()->at(index); 433 } 434 } 435 if (vtable_index == Method::invalid_vtable_index) { 436 // get vtable_index for miranda methods 437 klassVtable vt = ik->vtable(); 438 vtable_index = vt.index_of_miranda(name, signature); 439 } 440 return vtable_index; 441 } 442 443 Method* LinkResolver::lookup_method_in_interfaces(const LinkInfo& cp_info) { 444 InstanceKlass *ik = InstanceKlass::cast(cp_info.resolved_klass()); 445 446 // Specify 'true' in order to skip default methods when searching the 447 // interfaces. Function lookup_method_in_klasses() already looked for 448 // the method in the default methods table. 449 return ik->lookup_method_in_all_interfaces(cp_info.name(), cp_info.signature(), Klass::skip_defaults); 450 } 451 452 methodHandle LinkResolver::lookup_polymorphic_method( 453 const LinkInfo& link_info, 454 Handle *appendix_result_or_null, 455 Handle *method_type_result, 456 TRAPS) { 457 Klass* klass = link_info.resolved_klass(); 458 Symbol* name = link_info.name(); 459 Symbol* full_signature = link_info.signature(); 460 461 vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name); 462 if (TraceMethodHandles) { 463 ResourceMark rm(THREAD); 464 tty->print_cr("lookup_polymorphic_method iid=%s %s.%s%s", 465 vmIntrinsics::name_at(iid), klass->external_name(), 466 name->as_C_string(), full_signature->as_C_string()); 467 } 468 if ((klass == SystemDictionary::MethodHandle_klass() || 469 klass == SystemDictionary::VarHandle_klass()) && 470 iid != vmIntrinsics::_none) { 471 if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) { 472 // Most of these do not need an up-call to Java to resolve, so can be done anywhere. 473 // Do not erase last argument type (MemberName) if it is a static linkTo method. 474 bool keep_last_arg = MethodHandles::is_signature_polymorphic_static(iid); 475 TempNewSymbol basic_signature = 476 MethodHandles::lookup_basic_type_signature(full_signature, keep_last_arg, CHECK_NULL); 477 if (TraceMethodHandles) { 478 ResourceMark rm(THREAD); 479 tty->print_cr("lookup_polymorphic_method %s %s => basic %s", 480 name->as_C_string(), 481 full_signature->as_C_string(), 482 basic_signature->as_C_string()); 483 } 484 methodHandle result = SystemDictionary::find_method_handle_intrinsic(iid, 485 basic_signature, 486 CHECK_NULL); 487 if (result.not_null()) { 488 assert(result->is_method_handle_intrinsic(), "MH.invokeBasic or MH.linkTo* intrinsic"); 489 assert(result->intrinsic_id() != vmIntrinsics::_invokeGeneric, "wrong place to find this"); 490 assert(basic_signature == result->signature(), "predict the result signature"); 491 if (TraceMethodHandles) { 492 ttyLocker ttyl; 493 tty->print("lookup_polymorphic_method => intrinsic "); 494 result->print_on(tty); 495 } 496 } 497 return result; 498 } else if (iid == vmIntrinsics::_invokeGeneric 499 && THREAD->can_call_java() 500 && appendix_result_or_null != NULL) { 501 // This is a method with type-checking semantics. 502 // We will ask Java code to spin an adapter method for it. 503 if (!MethodHandles::enabled()) { 504 // Make sure the Java part of the runtime has been booted up. 505 Klass* natives = SystemDictionary::MethodHandleNatives_klass(); 506 if (natives == NULL || InstanceKlass::cast(natives)->is_not_initialized()) { 507 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_invoke_MethodHandleNatives(), 508 Handle(), 509 Handle(), 510 true, 511 CHECK_NULL); 512 } 513 } 514 515 Handle appendix; 516 Handle method_type; 517 methodHandle result = SystemDictionary::find_method_handle_invoker( 518 klass, 519 name, 520 full_signature, 521 link_info.current_klass(), 522 &appendix, 523 &method_type, 524 CHECK_NULL); 525 if (TraceMethodHandles) { 526 ttyLocker ttyl; 527 tty->print("lookup_polymorphic_method => (via Java) "); 528 result->print_on(tty); 529 tty->print(" lookup_polymorphic_method => appendix = "); 530 if (appendix.is_null()) tty->print_cr("(none)"); 531 else appendix->print_on(tty); 532 } 533 if (result.not_null()) { 534 #ifdef ASSERT 535 ResourceMark rm(THREAD); 536 537 TempNewSymbol basic_signature = 538 MethodHandles::lookup_basic_type_signature(full_signature, CHECK_NULL); 539 int actual_size_of_params = result->size_of_parameters(); 540 int expected_size_of_params = ArgumentSizeComputer(basic_signature).size(); 541 // +1 for MethodHandle.this, +1 for trailing MethodType 542 if (!MethodHandles::is_signature_polymorphic_static(iid)) expected_size_of_params += 1; 543 if (appendix.not_null()) expected_size_of_params += 1; 544 if (actual_size_of_params != expected_size_of_params) { 545 tty->print_cr("*** basic_signature=%s", basic_signature->as_C_string()); 546 tty->print_cr("*** result for %s: ", vmIntrinsics::name_at(iid)); 547 result->print(); 548 } 549 assert(actual_size_of_params == expected_size_of_params, 550 "%d != %d", actual_size_of_params, expected_size_of_params); 551 #endif //ASSERT 552 553 assert(appendix_result_or_null != NULL, ""); 554 (*appendix_result_or_null) = appendix; 555 (*method_type_result) = method_type; 556 } 557 return result; 558 } 559 } 560 return NULL; 561 } 562 563 void LinkResolver::check_method_accessability(Klass* ref_klass, 564 Klass* resolved_klass, 565 Klass* sel_klass, 566 const methodHandle& sel_method, 567 TRAPS) { 568 569 AccessFlags flags = sel_method->access_flags(); 570 571 // Special case: arrays always override "clone". JVMS 2.15. 572 // If the resolved klass is an array class, and the declaring class 573 // is java.lang.Object and the method is "clone", set the flags 574 // to public. 575 // 576 // We'll check for the method name first, as that's most likely 577 // to be false (so we'll short-circuit out of these tests). 578 if (sel_method->name() == vmSymbols::clone_name() && 579 sel_klass == SystemDictionary::Object_klass() && 580 resolved_klass->is_array_klass()) { 581 // We need to change "protected" to "public". 582 assert(flags.is_protected(), "clone not protected?"); 583 jint new_flags = flags.as_int(); 584 new_flags = new_flags & (~JVM_ACC_PROTECTED); 585 new_flags = new_flags | JVM_ACC_PUBLIC; 586 flags.set_flags(new_flags); 587 } 588 // assert(extra_arg_result_or_null != NULL, "must be able to return extra argument"); 589 590 bool can_access = Reflection::verify_member_access(ref_klass, 591 resolved_klass, 592 sel_klass, 593 flags, 594 true, false, CHECK); 595 // Any existing exceptions that may have been thrown, for example LinkageErrors 596 // from nest-host resolution, have been allowed to propagate. 597 if (!can_access) { 598 ResourceMark rm(THREAD); 599 bool same_module = (sel_klass->module() == ref_klass->module()); 600 Exceptions::fthrow( 601 THREAD_AND_LOCATION, 602 vmSymbols::java_lang_IllegalAccessError(), 603 "class %s tried to access %s%s%smethod %s.%s%s (%s%s%s)", 604 ref_klass->external_name(), 605 sel_method->is_abstract() ? "abstract " : "", 606 sel_method->is_protected() ? "protected " : "", 607 sel_method->is_private() ? "private " : "", 608 sel_klass->external_name(), 609 sel_method->name()->as_C_string(), 610 sel_method->signature()->as_C_string(), 611 (same_module) ? ref_klass->joint_in_module_of_loader(sel_klass) : ref_klass->class_in_module_of_loader(), 612 (same_module) ? "" : "; ", 613 (same_module) ? "" : sel_klass->class_in_module_of_loader() 614 ); 615 return; 616 } 617 } 618 619 methodHandle LinkResolver::resolve_method_statically(Bytecodes::Code code, 620 const constantPoolHandle& pool, int index, TRAPS) { 621 // This method is used only 622 // (1) in C2 from InlineTree::ok_to_inline (via ciMethod::check_call), 623 // and 624 // (2) in Bytecode_invoke::static_target 625 // It appears to fail when applied to an invokeinterface call site. 626 // FIXME: Remove this method and ciMethod::check_call; refactor to use the other LinkResolver entry points. 627 // resolve klass 628 if (code == Bytecodes::_invokedynamic) { 629 Klass* resolved_klass = SystemDictionary::MethodHandle_klass(); 630 Symbol* method_name = vmSymbols::invoke_name(); 631 Symbol* method_signature = pool->signature_ref_at(index); 632 Klass* current_klass = pool->pool_holder(); 633 LinkInfo link_info(resolved_klass, method_name, method_signature, current_klass); 634 return resolve_method(link_info, code, THREAD); 635 } 636 637 LinkInfo link_info(pool, index, methodHandle(), CHECK_NULL); 638 Klass* resolved_klass = link_info.resolved_klass(); 639 640 if (pool->has_preresolution() 641 || (resolved_klass == SystemDictionary::MethodHandle_klass() && 642 MethodHandles::is_signature_polymorphic_name(resolved_klass, link_info.name()))) { 643 Method* result = ConstantPool::method_at_if_loaded(pool, index); 644 if (result != NULL) { 645 return methodHandle(THREAD, result); 646 } 647 } 648 649 if (code == Bytecodes::_invokeinterface) { 650 return resolve_interface_method(link_info, code, THREAD); 651 } else if (code == Bytecodes::_invokevirtual) { 652 return resolve_method(link_info, code, THREAD); 653 } else if (!resolved_klass->is_interface()) { 654 return resolve_method(link_info, code, THREAD); 655 } else { 656 return resolve_interface_method(link_info, code, THREAD); 657 } 658 } 659 660 // Check and print a loader constraint violation message for method or interface method 661 void LinkResolver::check_method_loader_constraints(const LinkInfo& link_info, 662 const methodHandle& resolved_method, 663 const char* method_type, TRAPS) { 664 Handle current_loader(THREAD, link_info.current_klass()->class_loader()); 665 Handle resolved_loader(THREAD, resolved_method->method_holder()->class_loader()); 666 667 ResourceMark rm(THREAD); 668 Symbol* failed_type_symbol = 669 SystemDictionary::check_signature_loaders(link_info.signature(), current_loader, 670 resolved_loader, true, CHECK); 671 if (failed_type_symbol != NULL) { 672 Klass* current_class = link_info.current_klass(); 673 ClassLoaderData* current_loader_data = current_class->class_loader_data(); 674 assert(current_loader_data != NULL, "current class has no class loader data"); 675 Klass* resolved_method_class = resolved_method->method_holder(); 676 ClassLoaderData* target_loader_data = resolved_method_class->class_loader_data(); 677 assert(target_loader_data != NULL, "resolved method's class has no class loader data"); 678 679 stringStream ss; 680 ss.print("loader constraint violation: when resolving %s" 681 " \"%s\" the class loader %s of the current class, %s," 682 " and the class loader %s for the method's defining class, %s, have" 683 " different Class objects for the type %s used in the signature (%s; %s)", 684 method_type, 685 link_info.method_string(), 686 current_loader_data->loader_name_and_id(), 687 current_class->name()->as_C_string(), 688 target_loader_data->loader_name_and_id(), 689 resolved_method_class->name()->as_C_string(), 690 failed_type_symbol->as_C_string(), 691 current_class->class_in_module_of_loader(false, true), 692 resolved_method_class->class_in_module_of_loader(false, true)); 693 THROW_MSG(vmSymbols::java_lang_LinkageError(), ss.as_string()); 694 } 695 } 696 697 void LinkResolver::check_field_loader_constraints(Symbol* field, Symbol* sig, 698 Klass* current_klass, 699 Klass* sel_klass, TRAPS) { 700 Handle ref_loader(THREAD, current_klass->class_loader()); 701 Handle sel_loader(THREAD, sel_klass->class_loader()); 702 703 ResourceMark rm(THREAD); // needed for check_signature_loaders 704 Symbol* failed_type_symbol = 705 SystemDictionary::check_signature_loaders(sig, 706 ref_loader, sel_loader, 707 false, 708 CHECK); 709 if (failed_type_symbol != NULL) { 710 stringStream ss; 711 const char* failed_type_name = failed_type_symbol->as_klass_external_name(); 712 713 ss.print("loader constraint violation: when resolving field" 714 " \"%s\" of type %s, the class loader %s of the current class, " 715 "%s, and the class loader %s for the field's defining " 716 "type, %s, have different Class objects for type %s (%s; %s)", 717 field->as_C_string(), 718 failed_type_name, 719 current_klass->class_loader_data()->loader_name_and_id(), 720 current_klass->external_name(), 721 sel_klass->class_loader_data()->loader_name_and_id(), 722 sel_klass->external_name(), 723 failed_type_name, 724 current_klass->class_in_module_of_loader(false, true), 725 sel_klass->class_in_module_of_loader(false, true)); 726 THROW_MSG(vmSymbols::java_lang_LinkageError(), ss.as_string()); 727 } 728 } 729 730 methodHandle LinkResolver::resolve_method(const LinkInfo& link_info, 731 Bytecodes::Code code, TRAPS) { 732 733 Handle nested_exception; 734 Klass* resolved_klass = link_info.resolved_klass(); 735 736 // 1. For invokevirtual, cannot call an interface method 737 if (code == Bytecodes::_invokevirtual && resolved_klass->is_interface()) { 738 ResourceMark rm(THREAD); 739 char buf[200]; 740 jio_snprintf(buf, sizeof(buf), "Found interface %s, but class was expected", 741 resolved_klass->external_name()); 742 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 743 } 744 745 // 2. check constant pool tag for called method - must be JVM_CONSTANT_Methodref 746 if (!link_info.tag().is_invalid() && !link_info.tag().is_method()) { 747 ResourceMark rm(THREAD); 748 char buf[200]; 749 jio_snprintf(buf, sizeof(buf), "Method %s must be Methodref constant", link_info.method_string()); 750 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 751 } 752 753 // 3. lookup method in resolved klass and its super klasses 754 methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, true, false)); 755 756 // 4. lookup method in all the interfaces implemented by the resolved klass 757 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) { // not found in the class hierarchy 758 resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info)); 759 760 if (resolved_method.is_null()) { 761 // JSR 292: see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc 762 resolved_method = lookup_polymorphic_method(link_info, (Handle*)NULL, (Handle*)NULL, THREAD); 763 if (HAS_PENDING_EXCEPTION) { 764 nested_exception = Handle(THREAD, PENDING_EXCEPTION); 765 CLEAR_PENDING_EXCEPTION; 766 } 767 } 768 } 769 770 // 5. method lookup failed 771 if (resolved_method.is_null()) { 772 ResourceMark rm(THREAD); 773 THROW_MSG_CAUSE_(vmSymbols::java_lang_NoSuchMethodError(), 774 Method::name_and_sig_as_C_string(resolved_klass, 775 link_info.name(), 776 link_info.signature()), 777 nested_exception, NULL); 778 } 779 780 // 6. access checks, access checking may be turned off when calling from within the VM. 781 Klass* current_klass = link_info.current_klass(); 782 if (link_info.check_access()) { 783 assert(current_klass != NULL , "current_klass should not be null"); 784 785 // check if method can be accessed by the referring class 786 check_method_accessability(current_klass, 787 resolved_klass, 788 resolved_method->method_holder(), 789 resolved_method, 790 CHECK_NULL); 791 792 // check loader constraints 793 check_method_loader_constraints(link_info, resolved_method, "method", CHECK_NULL); 794 } 795 796 // For private method invocation we should only find the method in the resolved class. 797 // If that is not the case then we have a found a supertype method that we have nestmate 798 // access to. 799 if (resolved_method->is_private() && resolved_method->method_holder() != resolved_klass) { 800 ResourceMark rm(THREAD); 801 DEBUG_ONLY(bool is_nestmate = InstanceKlass::cast(link_info.current_klass())->has_nestmate_access_to(InstanceKlass::cast(resolved_klass), THREAD);) 802 assert(is_nestmate, "was only expecting nestmates to get here!"); 803 Exceptions::fthrow( 804 THREAD_AND_LOCATION, 805 vmSymbols::java_lang_NoSuchMethodError(), 806 "%s: method %s%s not found", 807 resolved_klass->external_name(), 808 resolved_method->name()->as_C_string(), 809 resolved_method->signature()->as_C_string() 810 ); 811 return NULL; 812 } 813 814 return resolved_method; 815 } 816 817 static void trace_method_resolution(const char* prefix, 818 Klass* klass, 819 Klass* resolved_klass, 820 const methodHandle& method, 821 bool logitables, 822 int index = -1) { 823 #ifndef PRODUCT 824 ResourceMark rm; 825 Log(itables) logi; 826 LogStream lsi(logi.trace()); 827 Log(vtables) logv; 828 LogStream lsv(logv.trace()); 829 outputStream* st; 830 if (logitables) { 831 st = &lsi; 832 } else { 833 st = &lsv; 834 } 835 st->print("%s%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ", 836 prefix, 837 (klass == NULL ? "<NULL>" : klass->internal_name()), 838 (resolved_klass == NULL ? "<NULL>" : resolved_klass->internal_name()), 839 Method::name_and_sig_as_C_string(resolved_klass, 840 method->name(), 841 method->signature()), 842 method->method_holder()->internal_name()); 843 method->print_linkage_flags(st); 844 if (index != -1) { 845 st->print("vtable_index:%d", index); 846 } 847 st->cr(); 848 #endif // PRODUCT 849 } 850 851 // Do linktime resolution of a method in the interface within the context of the specied bytecode. 852 methodHandle LinkResolver::resolve_interface_method(const LinkInfo& link_info, Bytecodes::Code code, TRAPS) { 853 854 Klass* resolved_klass = link_info.resolved_klass(); 855 856 // check if klass is interface 857 if (!resolved_klass->is_interface()) { 858 ResourceMark rm(THREAD); 859 char buf[200]; 860 jio_snprintf(buf, sizeof(buf), "Found class %s, but interface was expected", resolved_klass->external_name()); 861 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 862 } 863 864 // check constant pool tag for called method - must be JVM_CONSTANT_InterfaceMethodref 865 if (!link_info.tag().is_invalid() && !link_info.tag().is_interface_method()) { 866 ResourceMark rm(THREAD); 867 char buf[200]; 868 jio_snprintf(buf, sizeof(buf), "Method %s must be InterfaceMethodref constant", link_info.method_string()); 869 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 870 } 871 872 // lookup method in this interface or its super, java.lang.Object 873 // JDK8: also look for static methods 874 methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, false, true)); 875 876 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) { 877 // lookup method in all the super-interfaces 878 resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info)); 879 } 880 881 if (resolved_method.is_null()) { 882 // no method found 883 ResourceMark rm(THREAD); 884 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), 885 Method::name_and_sig_as_C_string(resolved_klass, 886 link_info.name(), 887 link_info.signature())); 888 } 889 890 if (link_info.check_access()) { 891 // JDK8 adds non-public interface methods, and accessability check requirement 892 Klass* current_klass = link_info.current_klass(); 893 894 assert(current_klass != NULL , "current_klass should not be null"); 895 896 // check if method can be accessed by the referring class 897 check_method_accessability(current_klass, 898 resolved_klass, 899 resolved_method->method_holder(), 900 resolved_method, 901 CHECK_NULL); 902 903 check_method_loader_constraints(link_info, resolved_method, "interface method", CHECK_NULL); 904 } 905 906 if (code != Bytecodes::_invokestatic && resolved_method->is_static()) { 907 ResourceMark rm(THREAD); 908 char buf[200]; 909 jio_snprintf(buf, sizeof(buf), "Expected instance not static method %s", 910 Method::name_and_sig_as_C_string(resolved_klass, 911 resolved_method->name(), resolved_method->signature())); 912 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 913 } 914 915 if (log_develop_is_enabled(Trace, itables)) { 916 char buf[200]; 917 jio_snprintf(buf, sizeof(buf), "%s resolved interface method: caller-class:", 918 Bytecodes::name(code)); 919 trace_method_resolution(buf, link_info.current_klass(), resolved_klass, 920 resolved_method, true); 921 } 922 923 return resolved_method; 924 } 925 926 //------------------------------------------------------------------------------------------------------------------------ 927 // Field resolution 928 929 void LinkResolver::check_field_accessability(Klass* ref_klass, 930 Klass* resolved_klass, 931 Klass* sel_klass, 932 const fieldDescriptor& fd, 933 TRAPS) { 934 bool can_access = Reflection::verify_member_access(ref_klass, 935 resolved_klass, 936 sel_klass, 937 fd.access_flags(), 938 true, false, CHECK); 939 // Any existing exceptions that may have been thrown, for example LinkageErrors 940 // from nest-host resolution, have been allowed to propagate. 941 if (!can_access) { 942 bool same_module = (sel_klass->module() == ref_klass->module()); 943 ResourceMark rm(THREAD); 944 Exceptions::fthrow( 945 THREAD_AND_LOCATION, 946 vmSymbols::java_lang_IllegalAccessError(), 947 "class %s tried to access %s%sfield %s.%s (%s%s%s)", 948 ref_klass->external_name(), 949 fd.is_protected() ? "protected " : "", 950 fd.is_private() ? "private " : "", 951 sel_klass->external_name(), 952 fd.name()->as_C_string(), 953 (same_module) ? ref_klass->joint_in_module_of_loader(sel_klass) : ref_klass->class_in_module_of_loader(), 954 (same_module) ? "" : "; ", 955 (same_module) ? "" : sel_klass->class_in_module_of_loader() 956 ); 957 return; 958 } 959 } 960 961 void LinkResolver::resolve_field_access(fieldDescriptor& fd, const constantPoolHandle& pool, int index, const methodHandle& method, Bytecodes::Code byte, TRAPS) { 962 LinkInfo link_info(pool, index, method, CHECK); 963 resolve_field(fd, link_info, byte, true, CHECK); 964 } 965 966 void LinkResolver::resolve_field(fieldDescriptor& fd, 967 const LinkInfo& link_info, 968 Bytecodes::Code byte, bool initialize_class, 969 TRAPS) { 970 assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic || 971 byte == Bytecodes::_getfield || byte == Bytecodes::_putfield || 972 byte == Bytecodes::_nofast_getfield || byte == Bytecodes::_nofast_putfield || 973 (byte == Bytecodes::_nop && !link_info.check_access()), "bad field access bytecode"); 974 975 bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic); 976 bool is_put = (byte == Bytecodes::_putfield || byte == Bytecodes::_putstatic || byte == Bytecodes::_nofast_putfield); 977 // Check if there's a resolved klass containing the field 978 Klass* resolved_klass = link_info.resolved_klass(); 979 Symbol* field = link_info.name(); 980 Symbol* sig = link_info.signature(); 981 982 if (resolved_klass == NULL) { 983 ResourceMark rm(THREAD); 984 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string()); 985 } 986 987 // Resolve instance field 988 Klass* sel_klass = resolved_klass->find_field(field, sig, &fd); 989 // check if field exists; i.e., if a klass containing the field def has been selected 990 if (sel_klass == NULL) { 991 ResourceMark rm(THREAD); 992 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string()); 993 } 994 995 if (!link_info.check_access()) 996 // Access checking may be turned off when calling from within the VM. 997 return; 998 999 // check access 1000 Klass* current_klass = link_info.current_klass(); 1001 check_field_accessability(current_klass, resolved_klass, sel_klass, fd, CHECK); 1002 1003 // check for errors 1004 if (is_static != fd.is_static()) { 1005 ResourceMark rm(THREAD); 1006 char msg[200]; 1007 jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string()); 1008 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg); 1009 } 1010 1011 // A final field can be modified only 1012 // (1) by methods declared in the class declaring the field and 1013 // (2) by the <clinit> method (in case of a static field) 1014 // or by the <init> method (in case of an instance field). 1015 if (is_put && fd.access_flags().is_final()) { 1016 ResourceMark rm(THREAD); 1017 stringStream ss; 1018 1019 if (sel_klass != current_klass) { 1020 ss.print("Update to %s final field %s.%s attempted from a different class (%s) than the field's declaring class", 1021 is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(), 1022 current_klass->external_name()); 1023 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string()); 1024 } 1025 1026 if (fd.constants()->pool_holder()->major_version() >= 53) { 1027 methodHandle m = link_info.current_method(); 1028 assert(!m.is_null(), "information about the current method must be available for 'put' bytecodes"); 1029 bool is_initialized_static_final_update = (byte == Bytecodes::_putstatic && 1030 fd.is_static() && 1031 !m()->is_static_initializer()); 1032 bool is_initialized_instance_final_update = ((byte == Bytecodes::_putfield || byte == Bytecodes::_nofast_putfield) && 1033 !fd.is_static() && 1034 !m->is_object_initializer()); 1035 1036 if (is_initialized_static_final_update || is_initialized_instance_final_update) { 1037 ss.print("Update to %s final field %s.%s attempted from a different method (%s) than the initializer method %s ", 1038 is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(), 1039 m()->name()->as_C_string(), 1040 is_static ? "<clinit>" : "<init>"); 1041 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string()); 1042 } 1043 } 1044 } 1045 1046 // initialize resolved_klass if necessary 1047 // note 1: the klass which declared the field must be initialized (i.e, sel_klass) 1048 // according to the newest JVM spec (5.5, p.170) - was bug (gri 7/28/99) 1049 // 1050 // note 2: we don't want to force initialization if we are just checking 1051 // if the field access is legal; e.g., during compilation 1052 if (is_static && initialize_class) { 1053 sel_klass->initialize(CHECK); 1054 } 1055 1056 if (sel_klass != current_klass) { 1057 check_field_loader_constraints(field, sig, current_klass, sel_klass, CHECK); 1058 } 1059 1060 // return information. note that the klass is set to the actual klass containing the 1061 // field, otherwise access of static fields in superclasses will not work. 1062 } 1063 1064 1065 //------------------------------------------------------------------------------------------------------------------------ 1066 // Invoke resolution 1067 // 1068 // Naming conventions: 1069 // 1070 // resolved_method the specified method (i.e., static receiver specified via constant pool index) 1071 // sel_method the selected method (selected via run-time lookup; e.g., based on dynamic receiver class) 1072 // resolved_klass the specified klass (i.e., specified via constant pool index) 1073 // recv_klass the receiver klass 1074 1075 1076 void LinkResolver::resolve_static_call(CallInfo& result, 1077 const LinkInfo& link_info, 1078 bool initialize_class, TRAPS) { 1079 methodHandle resolved_method = linktime_resolve_static_method(link_info, CHECK); 1080 1081 // The resolved class can change as a result of this resolution. 1082 Klass* resolved_klass = resolved_method->method_holder(); 1083 1084 // Initialize klass (this should only happen if everything is ok) 1085 if (initialize_class && resolved_klass->should_be_initialized()) { 1086 resolved_klass->initialize(CHECK); 1087 // Use updated LinkInfo to reresolve with resolved method holder 1088 LinkInfo new_info(resolved_klass, link_info.name(), link_info.signature(), 1089 link_info.current_klass(), 1090 link_info.check_access() ? LinkInfo::needs_access_check : LinkInfo::skip_access_check); 1091 resolved_method = linktime_resolve_static_method(new_info, CHECK); 1092 } 1093 1094 // setup result 1095 result.set_static(resolved_klass, resolved_method, CHECK); 1096 } 1097 1098 // throws linktime exceptions 1099 methodHandle LinkResolver::linktime_resolve_static_method(const LinkInfo& link_info, TRAPS) { 1100 1101 Klass* resolved_klass = link_info.resolved_klass(); 1102 methodHandle resolved_method; 1103 if (!resolved_klass->is_interface()) { 1104 resolved_method = resolve_method(link_info, Bytecodes::_invokestatic, CHECK_NULL); 1105 } else { 1106 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokestatic, CHECK_NULL); 1107 } 1108 assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier"); 1109 1110 // check if static 1111 if (!resolved_method->is_static()) { 1112 ResourceMark rm(THREAD); 1113 char buf[200]; 1114 jio_snprintf(buf, sizeof(buf), "Expected static method %s", Method::name_and_sig_as_C_string(resolved_klass, 1115 resolved_method->name(), 1116 resolved_method->signature())); 1117 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1118 } 1119 return resolved_method; 1120 } 1121 1122 1123 void LinkResolver::resolve_special_call(CallInfo& result, 1124 Handle recv, 1125 const LinkInfo& link_info, 1126 TRAPS) { 1127 methodHandle resolved_method = linktime_resolve_special_method(link_info, CHECK); 1128 runtime_resolve_special_method(result, link_info, resolved_method, recv, CHECK); 1129 } 1130 1131 // throws linktime exceptions 1132 methodHandle LinkResolver::linktime_resolve_special_method(const LinkInfo& link_info, 1133 TRAPS) { 1134 1135 // Invokespecial is called for multiple special reasons: 1136 // <init> 1137 // local private method invocation, for classes and interfaces 1138 // superclass.method, which can also resolve to a default method 1139 // and the selected method is recalculated relative to the direct superclass 1140 // superinterface.method, which explicitly does not check shadowing 1141 Klass* resolved_klass = link_info.resolved_klass(); 1142 methodHandle resolved_method; 1143 1144 if (!resolved_klass->is_interface()) { 1145 resolved_method = resolve_method(link_info, Bytecodes::_invokespecial, CHECK_NULL); 1146 } else { 1147 resolved_method = resolve_interface_method(link_info, Bytecodes::_invokespecial, CHECK_NULL); 1148 } 1149 1150 // check if method name is <init>, that it is found in same klass as static type 1151 if (resolved_method->name() == vmSymbols::object_initializer_name() && 1152 resolved_method->method_holder() != resolved_klass) { 1153 ResourceMark rm(THREAD); 1154 Exceptions::fthrow( 1155 THREAD_AND_LOCATION, 1156 vmSymbols::java_lang_NoSuchMethodError(), 1157 "%s: method %s%s not found", 1158 resolved_klass->external_name(), 1159 resolved_method->name()->as_C_string(), 1160 resolved_method->signature()->as_C_string() 1161 ); 1162 return NULL; 1163 } 1164 1165 // ensure that invokespecial's interface method reference is in 1166 // a direct superinterface, not an indirect superinterface 1167 Klass* current_klass = link_info.current_klass(); 1168 if (current_klass != NULL && resolved_klass->is_interface()) { 1169 InstanceKlass* ck = InstanceKlass::cast(current_klass); 1170 InstanceKlass *klass_to_check = !ck->is_unsafe_anonymous() ? 1171 ck : 1172 InstanceKlass::cast(ck->unsafe_anonymous_host()); 1173 // Disable verification for the dynamically-generated reflection bytecodes. 1174 bool is_reflect = klass_to_check->is_subclass_of( 1175 SystemDictionary::reflect_MagicAccessorImpl_klass()); 1176 1177 if (!is_reflect && 1178 !klass_to_check->is_same_or_direct_interface(resolved_klass)) { 1179 ResourceMark rm(THREAD); 1180 char buf[200]; 1181 jio_snprintf(buf, sizeof(buf), 1182 "Interface method reference: %s, is in an indirect superinterface of %s", 1183 Method::name_and_sig_as_C_string(resolved_klass, 1184 resolved_method->name(), 1185 resolved_method->signature()), 1186 current_klass->external_name()); 1187 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1188 } 1189 } 1190 1191 // check if not static 1192 if (resolved_method->is_static()) { 1193 ResourceMark rm(THREAD); 1194 char buf[200]; 1195 jio_snprintf(buf, sizeof(buf), 1196 "Expecting non-static method %s", 1197 Method::name_and_sig_as_C_string(resolved_klass, 1198 resolved_method->name(), 1199 resolved_method->signature())); 1200 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1201 } 1202 1203 if (log_develop_is_enabled(Trace, itables)) { 1204 trace_method_resolution("invokespecial resolved method: caller-class:", 1205 current_klass, resolved_klass, resolved_method, true); 1206 } 1207 1208 return resolved_method; 1209 } 1210 1211 // throws runtime exceptions 1212 void LinkResolver::runtime_resolve_special_method(CallInfo& result, 1213 const LinkInfo& link_info, 1214 const methodHandle& resolved_method, 1215 Handle recv, TRAPS) { 1216 1217 Klass* resolved_klass = link_info.resolved_klass(); 1218 1219 // resolved method is selected method unless we have an old-style lookup 1220 // for a superclass method 1221 // Invokespecial for a superinterface, resolved method is selected method, 1222 // no checks for shadowing 1223 methodHandle sel_method(THREAD, resolved_method()); 1224 1225 if (link_info.check_access() && 1226 // check if the method is not <init> 1227 resolved_method->name() != vmSymbols::object_initializer_name()) { 1228 1229 Klass* current_klass = link_info.current_klass(); 1230 1231 // Check if the class of the resolved_klass is a superclass 1232 // (not supertype in order to exclude interface classes) of the current class. 1233 // This check is not performed for super.invoke for interface methods 1234 // in super interfaces. 1235 if (current_klass->is_subclass_of(resolved_klass) && 1236 current_klass != resolved_klass) { 1237 // Lookup super method 1238 Klass* super_klass = current_klass->super(); 1239 sel_method = lookup_instance_method_in_klasses(super_klass, 1240 resolved_method->name(), 1241 resolved_method->signature(), 1242 Klass::find_private, CHECK); 1243 // check if found 1244 if (sel_method.is_null()) { 1245 ResourceMark rm(THREAD); 1246 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), 1247 Method::name_and_sig_as_C_string(resolved_klass, 1248 resolved_method->name(), 1249 resolved_method->signature())); 1250 // check loader constraints if found a different method 1251 } else if (sel_method() != resolved_method()) { 1252 check_method_loader_constraints(link_info, sel_method, "method", CHECK); 1253 } 1254 } 1255 1256 // Check that the class of objectref (the receiver) is the current class or interface, 1257 // or a subtype of the current class or interface (the sender), otherwise invokespecial 1258 // throws IllegalAccessError. 1259 // The verifier checks that the sender is a subtype of the class in the I/MR operand. 1260 // The verifier also checks that the receiver is a subtype of the sender, if the sender is 1261 // a class. If the sender is an interface, the check has to be performed at runtime. 1262 InstanceKlass* sender = InstanceKlass::cast(current_klass); 1263 sender = sender->is_unsafe_anonymous() ? sender->unsafe_anonymous_host() : sender; 1264 if (sender->is_interface() && recv.not_null()) { 1265 Klass* receiver_klass = recv->klass(); 1266 if (!receiver_klass->is_subtype_of(sender)) { 1267 ResourceMark rm(THREAD); 1268 char buf[500]; 1269 jio_snprintf(buf, sizeof(buf), 1270 "Receiver class %s must be the current class or a subtype of interface %s", 1271 receiver_klass->name()->as_C_string(), 1272 sender->name()->as_C_string()); 1273 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), buf); 1274 } 1275 } 1276 } 1277 1278 // check if not static 1279 if (sel_method->is_static()) { 1280 ResourceMark rm(THREAD); 1281 char buf[200]; 1282 jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass, 1283 resolved_method->name(), 1284 resolved_method->signature())); 1285 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1286 } 1287 1288 // check if abstract 1289 if (sel_method->is_abstract()) { 1290 ResourceMark rm(THREAD); 1291 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), 1292 Method::name_and_sig_as_C_string(resolved_klass, 1293 sel_method->name(), 1294 sel_method->signature())); 1295 } 1296 1297 if (log_develop_is_enabled(Trace, itables)) { 1298 trace_method_resolution("invokespecial selected method: resolved-class:", 1299 resolved_klass, resolved_klass, sel_method, true); 1300 } 1301 1302 // setup result 1303 result.set_static(resolved_klass, sel_method, CHECK); 1304 } 1305 1306 void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, Klass* receiver_klass, 1307 const LinkInfo& link_info, 1308 bool check_null_and_abstract, TRAPS) { 1309 methodHandle resolved_method = linktime_resolve_virtual_method(link_info, CHECK); 1310 runtime_resolve_virtual_method(result, resolved_method, 1311 link_info.resolved_klass(), 1312 recv, receiver_klass, 1313 check_null_and_abstract, CHECK); 1314 } 1315 1316 // throws linktime exceptions 1317 methodHandle LinkResolver::linktime_resolve_virtual_method(const LinkInfo& link_info, 1318 TRAPS) { 1319 // normal method resolution 1320 methodHandle resolved_method = resolve_method(link_info, Bytecodes::_invokevirtual, CHECK_NULL); 1321 1322 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier"); 1323 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier"); 1324 1325 // check if private interface method 1326 Klass* resolved_klass = link_info.resolved_klass(); 1327 Klass* current_klass = link_info.current_klass(); 1328 1329 // This is impossible, if resolve_klass is an interface, we've thrown icce in resolve_method 1330 if (resolved_klass->is_interface() && resolved_method->is_private()) { 1331 ResourceMark rm(THREAD); 1332 char buf[200]; 1333 jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokevirtual: method %s, caller-class:%s", 1334 Method::name_and_sig_as_C_string(resolved_klass, 1335 resolved_method->name(), 1336 resolved_method->signature()), 1337 (current_klass == NULL ? "<NULL>" : current_klass->internal_name())); 1338 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1339 } 1340 1341 // check if not static 1342 if (resolved_method->is_static()) { 1343 ResourceMark rm(THREAD); 1344 char buf[200]; 1345 jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass, 1346 resolved_method->name(), 1347 resolved_method->signature())); 1348 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1349 } 1350 1351 if (log_develop_is_enabled(Trace, vtables)) { 1352 trace_method_resolution("invokevirtual resolved method: caller-class:", 1353 current_klass, resolved_klass, resolved_method, false); 1354 } 1355 1356 return resolved_method; 1357 } 1358 1359 // throws runtime exceptions 1360 void LinkResolver::runtime_resolve_virtual_method(CallInfo& result, 1361 const methodHandle& resolved_method, 1362 Klass* resolved_klass, 1363 Handle recv, 1364 Klass* recv_klass, 1365 bool check_null_and_abstract, 1366 TRAPS) { 1367 1368 // setup default return values 1369 int vtable_index = Method::invalid_vtable_index; 1370 methodHandle selected_method; 1371 1372 // runtime method resolution 1373 if (check_null_and_abstract && recv.is_null()) { // check if receiver exists 1374 THROW(vmSymbols::java_lang_NullPointerException()); 1375 } 1376 1377 // Virtual methods cannot be resolved before its klass has been linked, for otherwise the Method*'s 1378 // has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since 1379 // a missing receiver might result in a bogus lookup. 1380 assert(resolved_method->method_holder()->is_linked(), "must be linked"); 1381 1382 // do lookup based on receiver klass using the vtable index 1383 if (resolved_method->method_holder()->is_interface()) { // default or miranda method 1384 vtable_index = vtable_index_of_interface_method(resolved_klass, resolved_method); 1385 assert(vtable_index >= 0 , "we should have valid vtable index at this point"); 1386 1387 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index)); 1388 } else { 1389 // at this point we are sure that resolved_method is virtual and not 1390 // a default or miranda method; therefore, it must have a valid vtable index. 1391 assert(!resolved_method->has_itable_index(), ""); 1392 vtable_index = resolved_method->vtable_index(); 1393 // We could get a negative vtable_index of nonvirtual_vtable_index for private 1394 // methods, or for final methods. Private methods never appear in the vtable 1395 // and never override other methods. As an optimization, final methods are 1396 // never put in the vtable, unless they override an existing method. 1397 // So if we do get nonvirtual_vtable_index, it means the selected method is the 1398 // resolved method, and it can never be changed by an override. 1399 if (vtable_index == Method::nonvirtual_vtable_index) { 1400 assert(resolved_method->can_be_statically_bound(), "cannot override this method"); 1401 selected_method = resolved_method; 1402 } else { 1403 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index)); 1404 } 1405 } 1406 1407 // check if method exists 1408 if (selected_method.is_null()) { 1409 throw_abstract_method_error(resolved_method, recv_klass, CHECK); 1410 } 1411 1412 // check if abstract 1413 if (check_null_and_abstract && selected_method->is_abstract()) { 1414 // Pass arguments for generating a verbose error message. 1415 throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK); 1416 } 1417 1418 if (log_develop_is_enabled(Trace, vtables)) { 1419 trace_method_resolution("invokevirtual selected method: receiver-class:", 1420 recv_klass, resolved_klass, selected_method, 1421 false, vtable_index); 1422 } 1423 // setup result 1424 result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK); 1425 } 1426 1427 void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, Klass* recv_klass, 1428 const LinkInfo& link_info, 1429 bool check_null_and_abstract, TRAPS) { 1430 // throws linktime exceptions 1431 methodHandle resolved_method = linktime_resolve_interface_method(link_info, CHECK); 1432 runtime_resolve_interface_method(result, resolved_method,link_info.resolved_klass(), 1433 recv, recv_klass, check_null_and_abstract, CHECK); 1434 } 1435 1436 methodHandle LinkResolver::linktime_resolve_interface_method(const LinkInfo& link_info, 1437 TRAPS) { 1438 // normal interface method resolution 1439 methodHandle resolved_method = resolve_interface_method(link_info, Bytecodes::_invokeinterface, CHECK_NULL); 1440 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier"); 1441 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier"); 1442 1443 return resolved_method; 1444 } 1445 1446 // throws runtime exceptions 1447 void LinkResolver::runtime_resolve_interface_method(CallInfo& result, 1448 const methodHandle& resolved_method, 1449 Klass* resolved_klass, 1450 Handle recv, 1451 Klass* recv_klass, 1452 bool check_null_and_abstract, TRAPS) { 1453 1454 // check if receiver exists 1455 if (check_null_and_abstract && recv.is_null()) { 1456 THROW(vmSymbols::java_lang_NullPointerException()); 1457 } 1458 1459 // check if receiver klass implements the resolved interface 1460 if (!recv_klass->is_subtype_of(resolved_klass)) { 1461 ResourceMark rm(THREAD); 1462 char buf[200]; 1463 jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s", 1464 recv_klass->external_name(), 1465 resolved_klass->external_name()); 1466 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1467 } 1468 1469 methodHandle selected_method = resolved_method; 1470 1471 // resolve the method in the receiver class, unless it is private 1472 if (!resolved_method()->is_private()) { 1473 // do lookup based on receiver klass 1474 // This search must match the linktime preparation search for itable initialization 1475 // to correctly enforce loader constraints for interface method inheritance. 1476 // Private methods are skipped as the resolved method was not private. 1477 selected_method = lookup_instance_method_in_klasses(recv_klass, 1478 resolved_method->name(), 1479 resolved_method->signature(), 1480 Klass::skip_private, CHECK); 1481 1482 if (selected_method.is_null() && !check_null_and_abstract) { 1483 // In theory this is a harmless placeholder value, but 1484 // in practice leaving in null affects the nsk default method tests. 1485 // This needs further study. 1486 selected_method = resolved_method; 1487 } 1488 // check if method exists 1489 if (selected_method.is_null()) { 1490 // Pass arguments for generating a verbose error message. 1491 throw_abstract_method_error(resolved_method, recv_klass, CHECK); 1492 } 1493 // check access 1494 // Throw Illegal Access Error if selected_method is not public. 1495 if (!selected_method->is_public()) { 1496 ResourceMark rm(THREAD); 1497 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), 1498 Method::name_and_sig_as_C_string(recv_klass, 1499 selected_method->name(), 1500 selected_method->signature())); 1501 } 1502 // check if abstract 1503 if (check_null_and_abstract && selected_method->is_abstract()) { 1504 throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK); 1505 } 1506 } 1507 1508 if (log_develop_is_enabled(Trace, itables)) { 1509 trace_method_resolution("invokeinterface selected method: receiver-class:", 1510 recv_klass, resolved_klass, selected_method, true); 1511 } 1512 // setup result 1513 if (resolved_method->has_vtable_index()) { 1514 int vtable_index = resolved_method->vtable_index(); 1515 log_develop_trace(itables)(" -- vtable index: %d", vtable_index); 1516 assert(vtable_index == selected_method->vtable_index(), "sanity check"); 1517 result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK); 1518 } else if (resolved_method->has_itable_index()) { 1519 int itable_index = resolved_method()->itable_index(); 1520 log_develop_trace(itables)(" -- itable index: %d", itable_index); 1521 result.set_interface(resolved_klass, recv_klass, resolved_method, selected_method, itable_index, CHECK); 1522 } else { 1523 int index = resolved_method->vtable_index(); 1524 log_develop_trace(itables)(" -- non itable/vtable index: %d", index); 1525 assert(index == Method::nonvirtual_vtable_index, "Oops hit another case!"); 1526 assert(resolved_method()->is_private() || 1527 (resolved_method()->is_final() && resolved_method->method_holder() == SystemDictionary::Object_klass()), 1528 "Should only have non-virtual invokeinterface for private or final-Object methods!"); 1529 assert(resolved_method()->can_be_statically_bound(), "Should only have non-virtual invokeinterface for statically bound methods!"); 1530 // This sets up the nonvirtual form of "virtual" call (as needed for final and private methods) 1531 result.set_virtual(resolved_klass, resolved_klass, resolved_method, resolved_method, index, CHECK); 1532 } 1533 } 1534 1535 1536 methodHandle LinkResolver::linktime_resolve_interface_method_or_null( 1537 const LinkInfo& link_info) { 1538 EXCEPTION_MARK; 1539 methodHandle method_result = linktime_resolve_interface_method(link_info, THREAD); 1540 if (HAS_PENDING_EXCEPTION) { 1541 CLEAR_PENDING_EXCEPTION; 1542 return methodHandle(); 1543 } else { 1544 return method_result; 1545 } 1546 } 1547 1548 methodHandle LinkResolver::linktime_resolve_virtual_method_or_null( 1549 const LinkInfo& link_info) { 1550 EXCEPTION_MARK; 1551 methodHandle method_result = linktime_resolve_virtual_method(link_info, THREAD); 1552 if (HAS_PENDING_EXCEPTION) { 1553 CLEAR_PENDING_EXCEPTION; 1554 return methodHandle(); 1555 } else { 1556 return method_result; 1557 } 1558 } 1559 1560 methodHandle LinkResolver::resolve_virtual_call_or_null( 1561 Klass* receiver_klass, 1562 const LinkInfo& link_info) { 1563 EXCEPTION_MARK; 1564 CallInfo info; 1565 resolve_virtual_call(info, Handle(), receiver_klass, link_info, false, THREAD); 1566 if (HAS_PENDING_EXCEPTION) { 1567 CLEAR_PENDING_EXCEPTION; 1568 return methodHandle(); 1569 } 1570 return info.selected_method(); 1571 } 1572 1573 methodHandle LinkResolver::resolve_interface_call_or_null( 1574 Klass* receiver_klass, 1575 const LinkInfo& link_info) { 1576 EXCEPTION_MARK; 1577 CallInfo info; 1578 resolve_interface_call(info, Handle(), receiver_klass, link_info, false, THREAD); 1579 if (HAS_PENDING_EXCEPTION) { 1580 CLEAR_PENDING_EXCEPTION; 1581 return methodHandle(); 1582 } 1583 return info.selected_method(); 1584 } 1585 1586 int LinkResolver::resolve_virtual_vtable_index(Klass* receiver_klass, 1587 const LinkInfo& link_info) { 1588 EXCEPTION_MARK; 1589 CallInfo info; 1590 resolve_virtual_call(info, Handle(), receiver_klass, link_info, 1591 /*check_null_or_abstract*/false, THREAD); 1592 if (HAS_PENDING_EXCEPTION) { 1593 CLEAR_PENDING_EXCEPTION; 1594 return Method::invalid_vtable_index; 1595 } 1596 return info.vtable_index(); 1597 } 1598 1599 methodHandle LinkResolver::resolve_static_call_or_null(const LinkInfo& link_info) { 1600 EXCEPTION_MARK; 1601 CallInfo info; 1602 resolve_static_call(info, link_info, /*initialize_class*/false, THREAD); 1603 if (HAS_PENDING_EXCEPTION) { 1604 CLEAR_PENDING_EXCEPTION; 1605 return methodHandle(); 1606 } 1607 return info.selected_method(); 1608 } 1609 1610 methodHandle LinkResolver::resolve_special_call_or_null(const LinkInfo& link_info) { 1611 EXCEPTION_MARK; 1612 CallInfo info; 1613 resolve_special_call(info, Handle(), link_info, THREAD); 1614 if (HAS_PENDING_EXCEPTION) { 1615 CLEAR_PENDING_EXCEPTION; 1616 return methodHandle(); 1617 } 1618 return info.selected_method(); 1619 } 1620 1621 1622 1623 //------------------------------------------------------------------------------------------------------------------------ 1624 // ConstantPool entries 1625 1626 void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) { 1627 switch (byte) { 1628 case Bytecodes::_invokestatic : resolve_invokestatic (result, pool, index, CHECK); break; 1629 case Bytecodes::_invokespecial : resolve_invokespecial (result, recv, pool, index, CHECK); break; 1630 case Bytecodes::_invokevirtual : resolve_invokevirtual (result, recv, pool, index, CHECK); break; 1631 case Bytecodes::_invokehandle : resolve_invokehandle (result, pool, index, CHECK); break; 1632 case Bytecodes::_invokedynamic : resolve_invokedynamic (result, pool, index, CHECK); break; 1633 case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break; 1634 default : break; 1635 } 1636 return; 1637 } 1638 1639 void LinkResolver::resolve_invoke(CallInfo& result, Handle& recv, 1640 const methodHandle& attached_method, 1641 Bytecodes::Code byte, TRAPS) { 1642 Klass* defc = attached_method->method_holder(); 1643 Symbol* name = attached_method->name(); 1644 Symbol* type = attached_method->signature(); 1645 LinkInfo link_info(defc, name, type); 1646 switch(byte) { 1647 case Bytecodes::_invokevirtual: 1648 resolve_virtual_call(result, recv, recv->klass(), link_info, 1649 /*check_null_and_abstract=*/true, CHECK); 1650 break; 1651 case Bytecodes::_invokeinterface: 1652 resolve_interface_call(result, recv, recv->klass(), link_info, 1653 /*check_null_and_abstract=*/true, CHECK); 1654 break; 1655 case Bytecodes::_invokestatic: 1656 resolve_static_call(result, link_info, /*initialize_class=*/false, CHECK); 1657 break; 1658 case Bytecodes::_invokespecial: 1659 resolve_special_call(result, recv, link_info, CHECK); 1660 break; 1661 default: 1662 fatal("bad call: %s", Bytecodes::name(byte)); 1663 break; 1664 } 1665 } 1666 1667 void LinkResolver::resolve_invokestatic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) { 1668 LinkInfo link_info(pool, index, CHECK); 1669 resolve_static_call(result, link_info, /*initialize_class*/true, CHECK); 1670 } 1671 1672 1673 void LinkResolver::resolve_invokespecial(CallInfo& result, Handle recv, 1674 const constantPoolHandle& pool, int index, TRAPS) { 1675 LinkInfo link_info(pool, index, CHECK); 1676 resolve_special_call(result, recv, link_info, CHECK); 1677 } 1678 1679 1680 void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv, 1681 const constantPoolHandle& pool, int index, 1682 TRAPS) { 1683 1684 LinkInfo link_info(pool, index, CHECK); 1685 Klass* recvrKlass = recv.is_null() ? (Klass*)NULL : recv->klass(); 1686 resolve_virtual_call(result, recv, recvrKlass, link_info, /*check_null_or_abstract*/true, CHECK); 1687 } 1688 1689 1690 void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, TRAPS) { 1691 LinkInfo link_info(pool, index, CHECK); 1692 Klass* recvrKlass = recv.is_null() ? (Klass*)NULL : recv->klass(); 1693 resolve_interface_call(result, recv, recvrKlass, link_info, true, CHECK); 1694 } 1695 1696 1697 void LinkResolver::resolve_invokehandle(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) { 1698 // This guy is reached from InterpreterRuntime::resolve_invokehandle. 1699 LinkInfo link_info(pool, index, CHECK); 1700 if (TraceMethodHandles) { 1701 ResourceMark rm(THREAD); 1702 tty->print_cr("resolve_invokehandle %s %s", link_info.name()->as_C_string(), 1703 link_info.signature()->as_C_string()); 1704 } 1705 resolve_handle_call(result, link_info, CHECK); 1706 } 1707 1708 void LinkResolver::resolve_handle_call(CallInfo& result, 1709 const LinkInfo& link_info, 1710 TRAPS) { 1711 // JSR 292: this must be an implicitly generated method MethodHandle.invokeExact(*...) or similar 1712 Klass* resolved_klass = link_info.resolved_klass(); 1713 assert(resolved_klass == SystemDictionary::MethodHandle_klass() || 1714 resolved_klass == SystemDictionary::VarHandle_klass(), ""); 1715 assert(MethodHandles::is_signature_polymorphic_name(link_info.name()), ""); 1716 Handle resolved_appendix; 1717 Handle resolved_method_type; 1718 methodHandle resolved_method = lookup_polymorphic_method(link_info, 1719 &resolved_appendix, &resolved_method_type, CHECK); 1720 result.set_handle(resolved_klass, resolved_method, resolved_appendix, resolved_method_type, CHECK); 1721 } 1722 1723 void LinkResolver::resolve_invokedynamic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) { 1724 Symbol* method_name = pool->name_ref_at(index); 1725 Symbol* method_signature = pool->signature_ref_at(index); 1726 Klass* current_klass = pool->pool_holder(); 1727 1728 // Resolve the bootstrap specifier (BSM + optional arguments). 1729 Handle bootstrap_specifier; 1730 // Check if CallSite has been bound already: 1731 ConstantPoolCacheEntry* cpce = pool->invokedynamic_cp_cache_entry_at(index); 1732 int pool_index = cpce->constant_pool_index(); 1733 1734 if (cpce->is_f1_null()) { 1735 if (cpce->indy_resolution_failed()) { 1736 ConstantPool::throw_resolution_error(pool, 1737 ResolutionErrorTable::encode_cpcache_index(index), 1738 CHECK); 1739 } 1740 1741 // The initial step in Call Site Specifier Resolution is to resolve the symbolic 1742 // reference to a method handle which will be the bootstrap method for a dynamic 1743 // call site. If resolution for the java.lang.invoke.MethodHandle for the bootstrap 1744 // method fails, then a MethodHandleInError is stored at the corresponding bootstrap 1745 // method's CP index for the CONSTANT_MethodHandle_info. So, there is no need to 1746 // set the indy_rf flag since any subsequent invokedynamic instruction which shares 1747 // this bootstrap method will encounter the resolution of MethodHandleInError. 1748 oop bsm_info = pool->resolve_bootstrap_specifier_at(pool_index, THREAD); 1749 Exceptions::wrap_dynamic_exception(CHECK); 1750 assert(bsm_info != NULL, ""); 1751 // FIXME: Cache this once per BootstrapMethods entry, not once per CONSTANT_InvokeDynamic. 1752 bootstrap_specifier = Handle(THREAD, bsm_info); 1753 } 1754 if (!cpce->is_f1_null()) { 1755 methodHandle method( THREAD, cpce->f1_as_method()); 1756 Handle appendix( THREAD, cpce->appendix_if_resolved(pool)); 1757 Handle method_type(THREAD, cpce->method_type_if_resolved(pool)); 1758 result.set_handle(method, appendix, method_type, THREAD); 1759 Exceptions::wrap_dynamic_exception(CHECK); 1760 return; 1761 } 1762 1763 if (TraceMethodHandles) { 1764 ResourceMark rm(THREAD); 1765 tty->print_cr("resolve_invokedynamic #%d %s %s in %s", 1766 ConstantPool::decode_invokedynamic_index(index), 1767 method_name->as_C_string(), method_signature->as_C_string(), 1768 current_klass->name()->as_C_string()); 1769 tty->print(" BSM info: "); bootstrap_specifier->print(); 1770 } 1771 1772 resolve_dynamic_call(result, pool_index, bootstrap_specifier, method_name, 1773 method_signature, current_klass, THREAD); 1774 if (HAS_PENDING_EXCEPTION && PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { 1775 int encoded_index = ResolutionErrorTable::encode_cpcache_index(index); 1776 bool recorded_res_status = cpce->save_and_throw_indy_exc(pool, pool_index, 1777 encoded_index, 1778 pool()->tag_at(pool_index), 1779 CHECK); 1780 if (!recorded_res_status) { 1781 // Another thread got here just before we did. So, either use the method 1782 // that it resolved or throw the LinkageError exception that it threw. 1783 if (!cpce->is_f1_null()) { 1784 methodHandle method( THREAD, cpce->f1_as_method()); 1785 Handle appendix( THREAD, cpce->appendix_if_resolved(pool)); 1786 Handle method_type(THREAD, cpce->method_type_if_resolved(pool)); 1787 result.set_handle(method, appendix, method_type, THREAD); 1788 Exceptions::wrap_dynamic_exception(CHECK); 1789 } else { 1790 assert(cpce->indy_resolution_failed(), "Resolution failure flag not set"); 1791 ConstantPool::throw_resolution_error(pool, encoded_index, CHECK); 1792 } 1793 return; 1794 } 1795 assert(cpce->indy_resolution_failed(), "Resolution failure flag wasn't set"); 1796 } 1797 } 1798 1799 void LinkResolver::resolve_dynamic_call(CallInfo& result, 1800 int pool_index, 1801 Handle bootstrap_specifier, 1802 Symbol* method_name, Symbol* method_signature, 1803 Klass* current_klass, 1804 TRAPS) { 1805 // JSR 292: this must resolve to an implicitly generated method MH.linkToCallSite(*...) 1806 // The appendix argument is likely to be a freshly-created CallSite. 1807 Handle resolved_appendix; 1808 Handle resolved_method_type; 1809 methodHandle resolved_method = 1810 SystemDictionary::find_dynamic_call_site_invoker(current_klass, 1811 pool_index, 1812 bootstrap_specifier, 1813 method_name, method_signature, 1814 &resolved_appendix, 1815 &resolved_method_type, 1816 THREAD); 1817 Exceptions::wrap_dynamic_exception(CHECK); 1818 result.set_handle(resolved_method, resolved_appendix, resolved_method_type, THREAD); 1819 Exceptions::wrap_dynamic_exception(CHECK); 1820 } 1821 1822 // Selected method is abstract. 1823 void LinkResolver::throw_abstract_method_error(const methodHandle& resolved_method, 1824 const methodHandle& selected_method, 1825 Klass *recv_klass, TRAPS) { 1826 Klass *resolved_klass = resolved_method->method_holder(); 1827 ResourceMark rm(THREAD); 1828 stringStream ss; 1829 1830 if (recv_klass != NULL) { 1831 ss.print("Receiver class %s does not define or inherit an " 1832 "implementation of the", 1833 recv_klass->external_name()); 1834 } else { 1835 ss.print("Missing implementation of"); 1836 } 1837 1838 assert(resolved_method.not_null(), "Sanity"); 1839 ss.print(" resolved method %s%s%s%s of %s %s.", 1840 resolved_method->is_abstract() ? "abstract " : "", 1841 resolved_method->is_private() ? "private " : "", 1842 resolved_method->name()->as_C_string(), 1843 resolved_method->signature()->as_C_string(), 1844 resolved_klass->external_kind(), 1845 resolved_klass->external_name()); 1846 1847 if (selected_method.not_null() && !(resolved_method == selected_method)) { 1848 ss.print(" Selected method is %s%s%s.", 1849 selected_method->is_abstract() ? "abstract " : "", 1850 selected_method->is_private() ? "private " : "", 1851 selected_method->name_and_sig_as_C_string()); 1852 } 1853 1854 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string()); 1855 }