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