linkResolver.cpp revision 9056:dc9930a04ab0
1/* 2 * Copyright (c) 1997, 2015, 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 "classfile/defaultMethods.hpp" 27#include "classfile/systemDictionary.hpp" 28#include "classfile/vmSymbols.hpp" 29#include "compiler/compileBroker.hpp" 30#include "gc/shared/collectedHeap.inline.hpp" 31#include "interpreter/bytecode.hpp" 32#include "interpreter/interpreterRuntime.hpp" 33#include "interpreter/linkResolver.hpp" 34#include "memory/resourceArea.hpp" 35#include "memory/universe.inline.hpp" 36#include "oops/instanceKlass.hpp" 37#include "oops/objArrayOop.hpp" 38#include "oops/oop.inline.hpp" 39#include "prims/methodHandles.hpp" 40#include "prims/nativeLookup.hpp" 41#include "runtime/compilationPolicy.hpp" 42#include "runtime/fieldDescriptor.hpp" 43#include "runtime/frame.inline.hpp" 44#include "runtime/handles.inline.hpp" 45#include "runtime/reflection.hpp" 46#include "runtime/signature.hpp" 47#include "runtime/thread.inline.hpp" 48#include "runtime/vmThread.hpp" 49 50 51//------------------------------------------------------------------------------------------------------------------------ 52// Implementation of CallInfo 53 54 55void CallInfo::set_static(KlassHandle resolved_klass, const methodHandle& resolved_method, TRAPS) { 56 int vtable_index = Method::nonvirtual_vtable_index; 57 set_common(resolved_klass, resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK); 58} 59 60 61void CallInfo::set_interface(KlassHandle resolved_klass, 62 KlassHandle selected_klass, 63 const methodHandle& resolved_method, 64 const methodHandle& selected_method, 65 int itable_index, TRAPS) { 66 // This is only called for interface methods. If the resolved_method 67 // comes from java/lang/Object, it can be the subject of a virtual call, so 68 // we should pick the vtable index from the resolved method. 69 // In that case, the caller must call set_virtual instead of set_interface. 70 assert(resolved_method->method_holder()->is_interface(), ""); 71 assert(itable_index == resolved_method()->itable_index(), ""); 72 set_common(resolved_klass, selected_klass, resolved_method, selected_method, CallInfo::itable_call, itable_index, CHECK); 73} 74 75void CallInfo::set_virtual(KlassHandle resolved_klass, 76 KlassHandle selected_klass, 77 const methodHandle& resolved_method, 78 const methodHandle& selected_method, 79 int vtable_index, TRAPS) { 80 assert(vtable_index >= 0 || vtable_index == Method::nonvirtual_vtable_index, "valid index"); 81 assert(vtable_index < 0 || !resolved_method->has_vtable_index() || vtable_index == resolved_method->vtable_index(), ""); 82 CallKind kind = (vtable_index >= 0 && !resolved_method->can_be_statically_bound() ? CallInfo::vtable_call : CallInfo::direct_call); 83 set_common(resolved_klass, selected_klass, resolved_method, selected_method, kind, vtable_index, CHECK); 84 assert(!resolved_method->is_compiled_lambda_form(), "these must be handled via an invokehandle call"); 85} 86 87void CallInfo::set_handle(const methodHandle& resolved_method, 88 Handle resolved_appendix, 89 Handle resolved_method_type, TRAPS) { 90 if (resolved_method.is_null()) { 91 THROW_MSG(vmSymbols::java_lang_InternalError(), "resolved method is null"); 92 } 93 KlassHandle resolved_klass = SystemDictionary::MethodHandle_klass(); 94 assert(resolved_method->intrinsic_id() == vmIntrinsics::_invokeBasic || 95 resolved_method->is_compiled_lambda_form(), 96 "linkMethod must return one of these"); 97 int vtable_index = Method::nonvirtual_vtable_index; 98 assert(!resolved_method->has_vtable_index(), ""); 99 set_common(resolved_klass, resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK); 100 _resolved_appendix = resolved_appendix; 101 _resolved_method_type = resolved_method_type; 102} 103 104void CallInfo::set_common(KlassHandle resolved_klass, 105 KlassHandle selected_klass, 106 const methodHandle& resolved_method, 107 const methodHandle& selected_method, 108 CallKind kind, 109 int index, 110 TRAPS) { 111 assert(resolved_method->signature() == selected_method->signature(), "signatures must correspond"); 112 _resolved_klass = resolved_klass; 113 _selected_klass = selected_klass; 114 _resolved_method = resolved_method; 115 _selected_method = selected_method; 116 _call_kind = kind; 117 _call_index = index; 118 _resolved_appendix = Handle(); 119 DEBUG_ONLY(verify()); // verify before making side effects 120 121 if (CompilationPolicy::must_be_compiled(selected_method)) { 122 // This path is unusual, mostly used by the '-Xcomp' stress test mode. 123 124 // Note: with several active threads, the must_be_compiled may be true 125 // while can_be_compiled is false; remove assert 126 // assert(CompilationPolicy::can_be_compiled(selected_method), "cannot compile"); 127 if (THREAD->is_Compiler_thread()) { 128 // don't force compilation, resolve was on behalf of compiler 129 return; 130 } 131 if (selected_method->method_holder()->is_not_initialized()) { 132 // 'is_not_initialized' means not only '!is_initialized', but also that 133 // initialization has not been started yet ('!being_initialized') 134 // Do not force compilation of methods in uninitialized classes. 135 // Note that doing this would throw an assert later, 136 // in CompileBroker::compile_method. 137 // We sometimes use the link resolver to do reflective lookups 138 // even before classes are initialized. 139 return; 140 } 141 CompileBroker::compile_method(selected_method, InvocationEntryBci, 142 CompilationPolicy::policy()->initial_compile_level(), 143 methodHandle(), 0, "must_be_compiled", CHECK); 144 } 145} 146 147// utility query for unreflecting a method 148CallInfo::CallInfo(Method* resolved_method, Klass* resolved_klass) { 149 Klass* resolved_method_holder = resolved_method->method_holder(); 150 if (resolved_klass == NULL) { // 2nd argument defaults to holder of 1st 151 resolved_klass = resolved_method_holder; 152 } 153 _resolved_klass = resolved_klass; 154 _selected_klass = resolved_klass; 155 _resolved_method = resolved_method; 156 _selected_method = resolved_method; 157 // classify: 158 CallKind kind = CallInfo::unknown_kind; 159 int index = resolved_method->vtable_index(); 160 if (resolved_method->can_be_statically_bound()) { 161 kind = CallInfo::direct_call; 162 } else if (!resolved_method_holder->is_interface()) { 163 // Could be an Object method inherited into an interface, but still a vtable call. 164 kind = CallInfo::vtable_call; 165 } else if (!resolved_klass->is_interface()) { 166 // A default or miranda method. Compute the vtable index. 167 ResourceMark rm; 168 klassVtable* vt = InstanceKlass::cast(resolved_klass)->vtable(); 169 index = LinkResolver::vtable_index_of_interface_method(resolved_klass, 170 resolved_method); 171 assert(index >= 0 , "we should have valid vtable index at this point"); 172 173 kind = CallInfo::vtable_call; 174 } else if (resolved_method->has_vtable_index()) { 175 // Can occur if an interface redeclares a method of Object. 176 177#ifdef ASSERT 178 // Ensure that this is really the case. 179 KlassHandle object_klass = SystemDictionary::Object_klass(); 180 Method * object_resolved_method = object_klass()->vtable()->method_at(index); 181 assert(object_resolved_method->name() == resolved_method->name(), 182 "Object and interface method names should match at vtable index %d, %s != %s", 183 index, object_resolved_method->name()->as_C_string(), resolved_method->name()->as_C_string()); 184 assert(object_resolved_method->signature() == resolved_method->signature(), 185 "Object and interface method signatures should match at vtable index %d, %s != %s", 186 index, object_resolved_method->signature()->as_C_string(), resolved_method->signature()->as_C_string()); 187#endif // ASSERT 188 189 kind = CallInfo::vtable_call; 190 } else { 191 // A regular interface call. 192 kind = CallInfo::itable_call; 193 index = resolved_method->itable_index(); 194 } 195 assert(index == Method::nonvirtual_vtable_index || index >= 0, "bad index %d", index); 196 _call_kind = kind; 197 _call_index = index; 198 _resolved_appendix = Handle(); 199 DEBUG_ONLY(verify()); 200} 201 202#ifdef ASSERT 203void 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 224void CallInfo::print() { 225 ResourceMark rm; 226 const char* kindstr = "unknown"; 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 } 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 240LinkInfo::LinkInfo(constantPoolHandle pool, int index, TRAPS) { 241 // resolve klass 242 Klass* result = pool->klass_ref_at(index, CHECK); 243 _resolved_klass = KlassHandle(THREAD, result); 244 245 // Get name, signature, and static klass 246 _name = pool->name_ref_at(index); 247 _signature = pool->signature_ref_at(index); 248 _current_klass = KlassHandle(THREAD, pool->pool_holder()); 249 250 // Coming from the constant pool always checks access 251 _check_access = true; 252} 253 254char* LinkInfo::method_string() const { 255 return Method::name_and_sig_as_C_string(_resolved_klass(), _name, _signature); 256} 257 258#ifndef PRODUCT 259void LinkInfo::print() { 260 ResourceMark rm; 261 tty->print_cr("Link resolved_klass=%s name=%s signature=%s current_klass=%s check_access=%s", 262 _resolved_klass->name()->as_C_string(), 263 _name->as_C_string(), 264 _signature->as_C_string(), 265 _current_klass.is_null() ? "(none)" : _current_klass->name()->as_C_string(), 266 _check_access ? "true" : "false"); 267} 268#endif // PRODUCT 269//------------------------------------------------------------------------------------------------------------------------ 270// Klass resolution 271 272void LinkResolver::check_klass_accessability(KlassHandle ref_klass, KlassHandle sel_klass, TRAPS) { 273 if (!Reflection::verify_class_access(ref_klass(), 274 sel_klass(), 275 true)) { 276 ResourceMark rm(THREAD); 277 Exceptions::fthrow( 278 THREAD_AND_LOCATION, 279 vmSymbols::java_lang_IllegalAccessError(), 280 "tried to access class %s from class %s", 281 sel_klass->external_name(), 282 ref_klass->external_name() 283 ); 284 return; 285 } 286} 287 288//------------------------------------------------------------------------------------------------------------------------ 289// Method resolution 290// 291// According to JVM spec. $5.4.3c & $5.4.3d 292 293// Look up method in klasses, including static methods 294// Then look up local default methods 295methodHandle LinkResolver::lookup_method_in_klasses(const LinkInfo& link_info, 296 bool checkpolymorphism, 297 bool in_imethod_resolve, TRAPS) { 298 KlassHandle klass = link_info.resolved_klass(); 299 Symbol* name = link_info.name(); 300 Symbol* signature = link_info.signature(); 301 302 // Ignore overpasses so statics can be found during resolution 303 Method* result = klass->uncached_lookup_method(name, signature, Klass::skip_overpass); 304 305 if (klass->oop_is_array()) { 306 // Only consider klass and super klass for arrays 307 return methodHandle(THREAD, result); 308 } 309 310 // JDK 8, JVMS 5.4.3.4: Interface method resolution should 311 // ignore static and non-public methods of java.lang.Object, 312 // like clone, finalize, registerNatives. 313 if (in_imethod_resolve && 314 result != NULL && 315 klass->is_interface() && 316 (result->is_static() || !result->is_public()) && 317 result->method_holder() == SystemDictionary::Object_klass()) { 318 result = NULL; 319 } 320 321 // Before considering default methods, check for an overpass in the 322 // current class if a method has not been found. 323 if (result == NULL) { 324 result = InstanceKlass::cast(klass())->find_method(name, signature); 325 } 326 327 if (result == NULL) { 328 Array<Method*>* default_methods = InstanceKlass::cast(klass())->default_methods(); 329 if (default_methods != NULL) { 330 result = InstanceKlass::find_method(default_methods, name, signature); 331 } 332 } 333 334 if (checkpolymorphism && result != NULL) { 335 vmIntrinsics::ID iid = result->intrinsic_id(); 336 if (MethodHandles::is_signature_polymorphic(iid)) { 337 // Do not link directly to these. The VM must produce a synthetic one using lookup_polymorphic_method. 338 return NULL; 339 } 340 } 341 return methodHandle(THREAD, result); 342} 343 344// returns first instance method 345// Looks up method in classes, then looks up local default methods 346methodHandle LinkResolver::lookup_instance_method_in_klasses(KlassHandle klass, 347 Symbol* name, 348 Symbol* signature, TRAPS) { 349 Method* result = klass->uncached_lookup_method(name, signature, Klass::find_overpass); 350 351 while (result != NULL && result->is_static() && result->method_holder()->super() != NULL) { 352 Klass* super_klass = result->method_holder()->super(); 353 result = super_klass->uncached_lookup_method(name, signature, Klass::find_overpass); 354 } 355 356 if (klass->oop_is_array()) { 357 // Only consider klass and super klass for arrays 358 return methodHandle(THREAD, result); 359 } 360 361 if (result == NULL) { 362 Array<Method*>* default_methods = InstanceKlass::cast(klass())->default_methods(); 363 if (default_methods != NULL) { 364 result = InstanceKlass::find_method(default_methods, name, signature); 365 assert(result == NULL || !result->is_static(), "static defaults not allowed"); 366 } 367 } 368 return methodHandle(THREAD, result); 369} 370 371int LinkResolver::vtable_index_of_interface_method(KlassHandle klass, 372 const methodHandle& resolved_method) { 373 374 int vtable_index = Method::invalid_vtable_index; 375 Symbol* name = resolved_method->name(); 376 Symbol* signature = resolved_method->signature(); 377 378 // First check in default method array 379 if (!resolved_method->is_abstract() && 380 (InstanceKlass::cast(klass())->default_methods() != NULL)) { 381 int index = InstanceKlass::find_method_index(InstanceKlass::cast(klass())->default_methods(), 382 name, signature, Klass::find_overpass, 383 Klass::find_static, Klass::find_private); 384 if (index >= 0 ) { 385 vtable_index = InstanceKlass::cast(klass())->default_vtable_indices()->at(index); 386 } 387 } 388 if (vtable_index == Method::invalid_vtable_index) { 389 // get vtable_index for miranda methods 390 ResourceMark rm; 391 klassVtable *vt = InstanceKlass::cast(klass())->vtable(); 392 vtable_index = vt->index_of_miranda(name, signature); 393 } 394 return vtable_index; 395} 396 397methodHandle LinkResolver::lookup_method_in_interfaces(const LinkInfo& cp_info, TRAPS) { 398 InstanceKlass *ik = InstanceKlass::cast(cp_info.resolved_klass()()); 399 400 // Specify 'true' in order to skip default methods when searching the 401 // interfaces. Function lookup_method_in_klasses() already looked for 402 // the method in the default methods table. 403 return methodHandle(THREAD, 404 ik->lookup_method_in_all_interfaces(cp_info.name(), cp_info.signature(), 405 Klass::skip_defaults)); 406} 407 408methodHandle LinkResolver::lookup_polymorphic_method( 409 const LinkInfo& link_info, 410 Handle *appendix_result_or_null, 411 Handle *method_type_result, 412 TRAPS) { 413 KlassHandle klass = link_info.resolved_klass(); 414 Symbol* name = link_info.name(); 415 Symbol* full_signature = link_info.signature(); 416 417 vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name); 418 if (TraceMethodHandles) { 419 ResourceMark rm(THREAD); 420 tty->print_cr("lookup_polymorphic_method iid=%s %s.%s%s", 421 vmIntrinsics::name_at(iid), klass->external_name(), 422 name->as_C_string(), full_signature->as_C_string()); 423 } 424 if (klass() == SystemDictionary::MethodHandle_klass() && 425 iid != vmIntrinsics::_none) { 426 if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) { 427 // Most of these do not need an up-call to Java to resolve, so can be done anywhere. 428 // Do not erase last argument type (MemberName) if it is a static linkTo method. 429 bool keep_last_arg = MethodHandles::is_signature_polymorphic_static(iid); 430 TempNewSymbol basic_signature = 431 MethodHandles::lookup_basic_type_signature(full_signature, keep_last_arg, CHECK_NULL); 432 if (TraceMethodHandles) { 433 ResourceMark rm(THREAD); 434 tty->print_cr("lookup_polymorphic_method %s %s => basic %s", 435 name->as_C_string(), 436 full_signature->as_C_string(), 437 basic_signature->as_C_string()); 438 } 439 methodHandle result = SystemDictionary::find_method_handle_intrinsic(iid, 440 basic_signature, 441 CHECK_NULL); 442 if (result.not_null()) { 443 assert(result->is_method_handle_intrinsic(), "MH.invokeBasic or MH.linkTo* intrinsic"); 444 assert(result->intrinsic_id() != vmIntrinsics::_invokeGeneric, "wrong place to find this"); 445 assert(basic_signature == result->signature(), "predict the result signature"); 446 if (TraceMethodHandles) { 447 tty->print("lookup_polymorphic_method => intrinsic "); 448 result->print_on(tty); 449 } 450 } 451 return result; 452 } else if (iid == vmIntrinsics::_invokeGeneric 453 && !THREAD->is_Compiler_thread() 454 && appendix_result_or_null != NULL) { 455 // This is a method with type-checking semantics. 456 // We will ask Java code to spin an adapter method for it. 457 if (!MethodHandles::enabled()) { 458 // Make sure the Java part of the runtime has been booted up. 459 Klass* natives = SystemDictionary::MethodHandleNatives_klass(); 460 if (natives == NULL || InstanceKlass::cast(natives)->is_not_initialized()) { 461 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_invoke_MethodHandleNatives(), 462 Handle(), 463 Handle(), 464 true, 465 CHECK_NULL); 466 } 467 } 468 469 Handle appendix; 470 Handle method_type; 471 methodHandle result = SystemDictionary::find_method_handle_invoker( 472 name, 473 full_signature, 474 link_info.current_klass(), 475 &appendix, 476 &method_type, 477 CHECK_NULL); 478 if (TraceMethodHandles) { 479 tty->print("lookup_polymorphic_method => (via Java) "); 480 result->print_on(tty); 481 tty->print(" lookup_polymorphic_method => appendix = "); 482 if (appendix.is_null()) tty->print_cr("(none)"); 483 else appendix->print_on(tty); 484 } 485 if (result.not_null()) { 486#ifdef ASSERT 487 ResourceMark rm(THREAD); 488 489 TempNewSymbol basic_signature = 490 MethodHandles::lookup_basic_type_signature(full_signature, CHECK_NULL); 491 int actual_size_of_params = result->size_of_parameters(); 492 int expected_size_of_params = ArgumentSizeComputer(basic_signature).size(); 493 // +1 for MethodHandle.this, +1 for trailing MethodType 494 if (!MethodHandles::is_signature_polymorphic_static(iid)) expected_size_of_params += 1; 495 if (appendix.not_null()) expected_size_of_params += 1; 496 if (actual_size_of_params != expected_size_of_params) { 497 tty->print_cr("*** basic_signature=%s", basic_signature->as_C_string()); 498 tty->print_cr("*** result for %s: ", vmIntrinsics::name_at(iid)); 499 result->print(); 500 } 501 assert(actual_size_of_params == expected_size_of_params, 502 "%d != %d", actual_size_of_params, expected_size_of_params); 503#endif //ASSERT 504 505 assert(appendix_result_or_null != NULL, ""); 506 (*appendix_result_or_null) = appendix; 507 (*method_type_result) = method_type; 508 } 509 return result; 510 } 511 } 512 return NULL; 513} 514 515void LinkResolver::check_method_accessability(KlassHandle ref_klass, 516 KlassHandle resolved_klass, 517 KlassHandle sel_klass, 518 const methodHandle& sel_method, 519 TRAPS) { 520 521 AccessFlags flags = sel_method->access_flags(); 522 523 // Special case: arrays always override "clone". JVMS 2.15. 524 // If the resolved klass is an array class, and the declaring class 525 // is java.lang.Object and the method is "clone", set the flags 526 // to public. 527 // 528 // We'll check for the method name first, as that's most likely 529 // to be false (so we'll short-circuit out of these tests). 530 if (sel_method->name() == vmSymbols::clone_name() && 531 sel_klass() == SystemDictionary::Object_klass() && 532 resolved_klass->oop_is_array()) { 533 // We need to change "protected" to "public". 534 assert(flags.is_protected(), "clone not protected?"); 535 jint new_flags = flags.as_int(); 536 new_flags = new_flags & (~JVM_ACC_PROTECTED); 537 new_flags = new_flags | JVM_ACC_PUBLIC; 538 flags.set_flags(new_flags); 539 } 540// assert(extra_arg_result_or_null != NULL, "must be able to return extra argument"); 541 542 if (!Reflection::verify_field_access(ref_klass(), 543 resolved_klass(), 544 sel_klass(), 545 flags, 546 true)) { 547 ResourceMark rm(THREAD); 548 Exceptions::fthrow( 549 THREAD_AND_LOCATION, 550 vmSymbols::java_lang_IllegalAccessError(), 551 "tried to access method %s.%s%s from class %s", 552 sel_klass->external_name(), 553 sel_method->name()->as_C_string(), 554 sel_method->signature()->as_C_string(), 555 ref_klass->external_name() 556 ); 557 return; 558 } 559} 560 561methodHandle LinkResolver::resolve_method_statically(Bytecodes::Code code, 562 constantPoolHandle pool, int index, TRAPS) { 563 // This method is used only 564 // (1) in C2 from InlineTree::ok_to_inline (via ciMethod::check_call), 565 // and 566 // (2) in Bytecode_invoke::static_target 567 // It appears to fail when applied to an invokeinterface call site. 568 // FIXME: Remove this method and ciMethod::check_call; refactor to use the other LinkResolver entry points. 569 // resolve klass 570 KlassHandle resolved_klass; 571 if (code == Bytecodes::_invokedynamic) { 572 resolved_klass = SystemDictionary::MethodHandle_klass(); 573 Symbol* method_name = vmSymbols::invoke_name(); 574 Symbol* method_signature = pool->signature_ref_at(index); 575 KlassHandle current_klass(THREAD, pool->pool_holder()); 576 LinkInfo link_info(resolved_klass, method_name, method_signature, current_klass); 577 return resolve_method(link_info, /*require_methodref*/false, THREAD); 578 } 579 580 LinkInfo link_info(pool, index, CHECK_NULL); 581 resolved_klass = link_info.resolved_klass(); 582 583 if (pool->has_preresolution() 584 || (resolved_klass() == SystemDictionary::MethodHandle_klass() && 585 MethodHandles::is_signature_polymorphic_name(resolved_klass(), link_info.name()))) { 586 Method* result = ConstantPool::method_at_if_loaded(pool, index); 587 if (result != NULL) { 588 return methodHandle(THREAD, result); 589 } 590 } 591 592 if (code == Bytecodes::_invokeinterface) { 593 return resolve_interface_method(link_info, true, THREAD); 594 } else if (code == Bytecodes::_invokevirtual) { 595 return resolve_method(link_info, /*require_methodref*/true, THREAD); 596 } else if (!resolved_klass->is_interface()) { 597 return resolve_method(link_info, /*require_methodref*/false, THREAD); 598 } else { 599 bool nostatics = (code == Bytecodes::_invokestatic) ? false : true; 600 return resolve_interface_method(link_info, nostatics, THREAD); 601 } 602} 603 604// Check and print a loader constraint violation message for method or interface method 605void LinkResolver::check_method_loader_constraints(const LinkInfo& link_info, 606 const methodHandle& resolved_method, 607 const char* method_type, TRAPS) { 608 Handle current_loader(THREAD, link_info.current_klass()->class_loader()); 609 Handle resolved_loader(THREAD, resolved_method->method_holder()->class_loader()); 610 611 ResourceMark rm(THREAD); 612 Symbol* failed_type_symbol = 613 SystemDictionary::check_signature_loaders(link_info.signature(), current_loader, 614 resolved_loader, true, CHECK); 615 if (failed_type_symbol != NULL) { 616 const char* msg = "loader constraint violation: when resolving %s" 617 " \"%s\" the class loader (instance of %s) of the current class, %s," 618 " and the class loader (instance of %s) for the method's defining class, %s, have" 619 " different Class objects for the type %s used in the signature"; 620 char* sig = link_info.method_string(); 621 const char* loader1_name = SystemDictionary::loader_name(current_loader()); 622 char* current = link_info.current_klass()->name()->as_C_string(); 623 const char* loader2_name = SystemDictionary::loader_name(resolved_loader()); 624 char* target = resolved_method->method_holder()->name()->as_C_string(); 625 char* failed_type_name = failed_type_symbol->as_C_string(); 626 size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1_name) + 627 strlen(current) + strlen(loader2_name) + strlen(target) + 628 strlen(failed_type_name) + strlen(method_type) + 1; 629 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); 630 jio_snprintf(buf, buflen, msg, method_type, sig, loader1_name, current, loader2_name, 631 target, failed_type_name); 632 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); 633 } 634} 635 636void LinkResolver::check_field_loader_constraints(Symbol* field, Symbol* sig, 637 KlassHandle current_klass, 638 KlassHandle sel_klass, TRAPS) { 639 Handle ref_loader(THREAD, current_klass->class_loader()); 640 Handle sel_loader(THREAD, sel_klass->class_loader()); 641 642 ResourceMark rm(THREAD); // needed for check_signature_loaders 643 Symbol* failed_type_symbol = 644 SystemDictionary::check_signature_loaders(sig, 645 ref_loader, sel_loader, 646 false, 647 CHECK); 648 if (failed_type_symbol != NULL) { 649 const char* msg = "loader constraint violation: when resolving field" 650 " \"%s\" the class loader (instance of %s) of the referring class, " 651 "%s, and the class loader (instance of %s) for the field's resolved " 652 "type, %s, have different Class objects for that type"; 653 char* field_name = field->as_C_string(); 654 const char* loader1_name = SystemDictionary::loader_name(ref_loader()); 655 char* sel = sel_klass->name()->as_C_string(); 656 const char* loader2_name = SystemDictionary::loader_name(sel_loader()); 657 char* failed_type_name = failed_type_symbol->as_C_string(); 658 size_t buflen = strlen(msg) + strlen(field_name) + strlen(loader1_name) + 659 strlen(sel) + strlen(loader2_name) + strlen(failed_type_name) + 1; 660 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); 661 jio_snprintf(buf, buflen, msg, field_name, loader1_name, sel, loader2_name, 662 failed_type_name); 663 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); 664 } 665} 666 667methodHandle LinkResolver::resolve_method(const LinkInfo& link_info, 668 bool require_methodref, TRAPS) { 669 670 Handle nested_exception; 671 KlassHandle resolved_klass = link_info.resolved_klass(); 672 673 // 1. check if methodref required, that resolved_klass is not interfacemethodref 674 if (require_methodref && resolved_klass->is_interface()) { 675 ResourceMark rm(THREAD); 676 char buf[200]; 677 jio_snprintf(buf, sizeof(buf), "Found interface %s, but class was expected", 678 resolved_klass()->external_name()); 679 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 680 } 681 682 // 2. lookup method in resolved klass and its super klasses 683 methodHandle resolved_method = lookup_method_in_klasses(link_info, true, false, CHECK_NULL); 684 685 if (resolved_method.is_null() && !resolved_klass->oop_is_array()) { // not found in the class hierarchy 686 // 3. lookup method in all the interfaces implemented by the resolved klass 687 resolved_method = lookup_method_in_interfaces(link_info, CHECK_NULL); 688 689 if (resolved_method.is_null()) { 690 // JSR 292: see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc 691 resolved_method = lookup_polymorphic_method(link_info, (Handle*)NULL, (Handle*)NULL, THREAD); 692 if (HAS_PENDING_EXCEPTION) { 693 nested_exception = Handle(THREAD, PENDING_EXCEPTION); 694 CLEAR_PENDING_EXCEPTION; 695 } 696 } 697 } 698 699 if (resolved_method.is_null()) { 700 // 4. method lookup failed 701 ResourceMark rm(THREAD); 702 THROW_MSG_CAUSE_(vmSymbols::java_lang_NoSuchMethodError(), 703 Method::name_and_sig_as_C_string(resolved_klass(), 704 link_info.name(), 705 link_info.signature()), 706 nested_exception, NULL); 707 } 708 709 // 5. access checks, access checking may be turned off when calling from within the VM. 710 KlassHandle current_klass = link_info.current_klass(); 711 if (link_info.check_access()) { 712 assert(current_klass.not_null() , "current_klass should not be null"); 713 714 // check if method can be accessed by the referring class 715 check_method_accessability(current_klass, 716 resolved_klass, 717 KlassHandle(THREAD, resolved_method->method_holder()), 718 resolved_method, 719 CHECK_NULL); 720 721 // check loader constraints 722 check_method_loader_constraints(link_info, resolved_method, "method", CHECK_NULL); 723 } 724 725 return resolved_method; 726} 727 728methodHandle LinkResolver::resolve_interface_method(const LinkInfo& link_info, 729 bool nostatics, TRAPS) { 730 731 KlassHandle resolved_klass = link_info.resolved_klass(); 732 733 // check if klass is interface 734 if (!resolved_klass->is_interface()) { 735 ResourceMark rm(THREAD); 736 char buf[200]; 737 jio_snprintf(buf, sizeof(buf), "Found class %s, but interface was expected", resolved_klass()->external_name()); 738 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 739 } 740 741 // lookup method in this interface or its super, java.lang.Object 742 // JDK8: also look for static methods 743 methodHandle resolved_method = lookup_method_in_klasses(link_info, false, true, CHECK_NULL); 744 745 if (resolved_method.is_null() && !resolved_klass->oop_is_array()) { 746 // lookup method in all the super-interfaces 747 resolved_method = lookup_method_in_interfaces(link_info, CHECK_NULL); 748 } 749 750 if (resolved_method.is_null()) { 751 // no method found 752 ResourceMark rm(THREAD); 753 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), 754 Method::name_and_sig_as_C_string(resolved_klass(), 755 link_info.name(), 756 link_info.signature())); 757 } 758 759 if (link_info.check_access()) { 760 // JDK8 adds non-public interface methods, and accessability check requirement 761 KlassHandle current_klass = link_info.current_klass(); 762 763 assert(current_klass.not_null() , "current_klass should not be null"); 764 765 // check if method can be accessed by the referring class 766 check_method_accessability(current_klass, 767 resolved_klass, 768 KlassHandle(THREAD, resolved_method->method_holder()), 769 resolved_method, 770 CHECK_NULL); 771 772 check_method_loader_constraints(link_info, resolved_method, "interface method", CHECK_NULL); 773 } 774 775 if (nostatics && resolved_method->is_static()) { 776 ResourceMark rm(THREAD); 777 char buf[200]; 778 jio_snprintf(buf, sizeof(buf), "Expected instance not static method %s", 779 Method::name_and_sig_as_C_string(resolved_klass(), 780 resolved_method->name(), resolved_method->signature())); 781 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 782 } 783 784 if (TraceItables && Verbose) { 785 trace_method_resolution("invokeinterface resolved method: caller-class", 786 link_info.current_klass(), resolved_klass, resolved_method); 787 tty->cr(); 788 } 789 790 return resolved_method; 791} 792 793//------------------------------------------------------------------------------------------------------------------------ 794// Field resolution 795 796void LinkResolver::check_field_accessability(KlassHandle ref_klass, 797 KlassHandle resolved_klass, 798 KlassHandle sel_klass, 799 const fieldDescriptor& fd, 800 TRAPS) { 801 if (!Reflection::verify_field_access(ref_klass(), 802 resolved_klass(), 803 sel_klass(), 804 fd.access_flags(), 805 true)) { 806 ResourceMark rm(THREAD); 807 Exceptions::fthrow( 808 THREAD_AND_LOCATION, 809 vmSymbols::java_lang_IllegalAccessError(), 810 "tried to access field %s.%s from class %s", 811 sel_klass->external_name(), 812 fd.name()->as_C_string(), 813 ref_klass->external_name() 814 ); 815 return; 816 } 817} 818 819void LinkResolver::resolve_field_access(fieldDescriptor& fd, constantPoolHandle pool, int index, Bytecodes::Code byte, TRAPS) { 820 LinkInfo link_info(pool, index, CHECK); 821 resolve_field(fd, link_info, byte, true, CHECK); 822} 823 824void LinkResolver::resolve_field(fieldDescriptor& fd, 825 const LinkInfo& link_info, 826 Bytecodes::Code byte, bool initialize_class, 827 TRAPS) { 828 assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic || 829 byte == Bytecodes::_getfield || byte == Bytecodes::_putfield || 830 byte == Bytecodes::_nofast_getfield || byte == Bytecodes::_nofast_putfield || 831 (byte == Bytecodes::_nop && !link_info.check_access()), "bad field access bytecode"); 832 833 bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic); 834 bool is_put = (byte == Bytecodes::_putfield || byte == Bytecodes::_putstatic || byte == Bytecodes::_nofast_putfield); 835 // Check if there's a resolved klass containing the field 836 KlassHandle resolved_klass = link_info.resolved_klass(); 837 Symbol* field = link_info.name(); 838 Symbol* sig = link_info.signature(); 839 840 if (resolved_klass.is_null()) { 841 ResourceMark rm(THREAD); 842 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string()); 843 } 844 845 // Resolve instance field 846 KlassHandle sel_klass(THREAD, resolved_klass->find_field(field, sig, &fd)); 847 // check if field exists; i.e., if a klass containing the field def has been selected 848 if (sel_klass.is_null()) { 849 ResourceMark rm(THREAD); 850 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string()); 851 } 852 853 if (!link_info.check_access()) 854 // Access checking may be turned off when calling from within the VM. 855 return; 856 857 // check access 858 KlassHandle current_klass = link_info.current_klass(); 859 check_field_accessability(current_klass, resolved_klass, sel_klass, fd, CHECK); 860 861 // check for errors 862 if (is_static != fd.is_static()) { 863 ResourceMark rm(THREAD); 864 char msg[200]; 865 jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", resolved_klass()->external_name(), fd.name()->as_C_string()); 866 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg); 867 } 868 869 // Final fields can only be accessed from its own class. 870 if (is_put && fd.access_flags().is_final() && sel_klass() != current_klass()) { 871 THROW(vmSymbols::java_lang_IllegalAccessError()); 872 } 873 874 // initialize resolved_klass if necessary 875 // note 1: the klass which declared the field must be initialized (i.e, sel_klass) 876 // according to the newest JVM spec (5.5, p.170) - was bug (gri 7/28/99) 877 // 878 // note 2: we don't want to force initialization if we are just checking 879 // if the field access is legal; e.g., during compilation 880 if (is_static && initialize_class) { 881 sel_klass->initialize(CHECK); 882 } 883 884 if (sel_klass() != current_klass()) { 885 check_field_loader_constraints(field, sig, current_klass, sel_klass, CHECK); 886 } 887 888 // return information. note that the klass is set to the actual klass containing the 889 // field, otherwise access of static fields in superclasses will not work. 890} 891 892 893//------------------------------------------------------------------------------------------------------------------------ 894// Invoke resolution 895// 896// Naming conventions: 897// 898// resolved_method the specified method (i.e., static receiver specified via constant pool index) 899// sel_method the selected method (selected via run-time lookup; e.g., based on dynamic receiver class) 900// resolved_klass the specified klass (i.e., specified via constant pool index) 901// recv_klass the receiver klass 902 903 904void LinkResolver::resolve_static_call(CallInfo& result, 905 const LinkInfo& link_info, 906 bool initialize_class, TRAPS) { 907 methodHandle resolved_method = linktime_resolve_static_method(link_info, CHECK); 908 909 // The resolved class can change as a result of this resolution. 910 KlassHandle resolved_klass = KlassHandle(THREAD, resolved_method->method_holder()); 911 912 Method* save_resolved_method = resolved_method(); 913 // Initialize klass (this should only happen if everything is ok) 914 if (initialize_class && resolved_klass->should_be_initialized()) { 915 resolved_klass->initialize(CHECK); 916 // Use updated LinkInfo (to reresolve with resolved_klass as method_holder?) 917 LinkInfo new_info(resolved_klass, link_info.name(), link_info.signature(), 918 link_info.current_klass(), link_info.check_access()); 919 resolved_method = linktime_resolve_static_method(new_info, CHECK); 920 } 921 922 assert(save_resolved_method == resolved_method(), "does this change?"); 923 // setup result 924 result.set_static(resolved_klass, resolved_method, CHECK); 925} 926 927// throws linktime exceptions 928methodHandle LinkResolver::linktime_resolve_static_method(const LinkInfo& link_info, TRAPS) { 929 930 KlassHandle resolved_klass = link_info.resolved_klass(); 931 methodHandle resolved_method; 932 if (!resolved_klass->is_interface()) { 933 resolved_method = resolve_method(link_info, /*require_methodref*/false, CHECK_NULL); 934 } else { 935 resolved_method = resolve_interface_method(link_info, /*nostatics*/false, CHECK_NULL); 936 } 937 assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier"); 938 939 // check if static 940 if (!resolved_method->is_static()) { 941 ResourceMark rm(THREAD); 942 char buf[200]; 943 jio_snprintf(buf, sizeof(buf), "Expected static method %s", Method::name_and_sig_as_C_string(resolved_klass(), 944 resolved_method->name(), 945 resolved_method->signature())); 946 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 947 } 948 return resolved_method; 949} 950 951 952void LinkResolver::resolve_special_call(CallInfo& result, 953 const LinkInfo& link_info, 954 TRAPS) { 955 methodHandle resolved_method = linktime_resolve_special_method(link_info, CHECK); 956 runtime_resolve_special_method(result, resolved_method, 957 link_info.resolved_klass(), 958 link_info.current_klass(), 959 link_info.check_access(), CHECK); 960} 961 962// throws linktime exceptions 963methodHandle LinkResolver::linktime_resolve_special_method(const LinkInfo& link_info, 964 TRAPS) { 965 966 // Invokespecial is called for multiple special reasons: 967 // <init> 968 // local private method invocation, for classes and interfaces 969 // superclass.method, which can also resolve to a default method 970 // and the selected method is recalculated relative to the direct superclass 971 // superinterface.method, which explicitly does not check shadowing 972 KlassHandle resolved_klass = link_info.resolved_klass(); 973 methodHandle resolved_method; 974 975 if (!resolved_klass->is_interface()) { 976 resolved_method = resolve_method(link_info, /*require_methodref*/false, CHECK_NULL); 977 } else { 978 resolved_method = resolve_interface_method(link_info, /*nostatics*/true, CHECK_NULL); 979 } 980 981 // check if method name is <init>, that it is found in same klass as static type 982 if (resolved_method->name() == vmSymbols::object_initializer_name() && 983 resolved_method->method_holder() != resolved_klass()) { 984 ResourceMark rm(THREAD); 985 Exceptions::fthrow( 986 THREAD_AND_LOCATION, 987 vmSymbols::java_lang_NoSuchMethodError(), 988 "%s: method %s%s not found", 989 resolved_klass->external_name(), 990 resolved_method->name()->as_C_string(), 991 resolved_method->signature()->as_C_string() 992 ); 993 return NULL; 994 } 995 996 // check if invokespecial's interface method reference is in an indirect superinterface 997 KlassHandle current_klass = link_info.current_klass(); 998 if (!current_klass.is_null() && resolved_klass->is_interface()) { 999 Klass *klass_to_check = !InstanceKlass::cast(current_klass())->is_anonymous() ? 1000 current_klass() : 1001 InstanceKlass::cast(current_klass())->host_klass(); 1002 // Disable verification for the dynamically-generated reflection bytecodes. 1003 bool is_reflect = klass_to_check->is_subclass_of( 1004 SystemDictionary::reflect_MagicAccessorImpl_klass()); 1005 1006 if (!is_reflect && 1007 !InstanceKlass::cast(klass_to_check)->is_same_or_direct_interface(resolved_klass())) { 1008 ResourceMark rm(THREAD); 1009 char buf[200]; 1010 jio_snprintf(buf, sizeof(buf), 1011 "Interface method reference: %s, is in an indirect superinterface of %s", 1012 Method::name_and_sig_as_C_string(resolved_klass(), 1013 resolved_method->name(), 1014 resolved_method->signature()), 1015 current_klass->external_name()); 1016 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1017 } 1018 } 1019 1020 // check if not static 1021 if (resolved_method->is_static()) { 1022 ResourceMark rm(THREAD); 1023 char buf[200]; 1024 jio_snprintf(buf, sizeof(buf), 1025 "Expecting non-static method %s", 1026 Method::name_and_sig_as_C_string(resolved_klass(), 1027 resolved_method->name(), 1028 resolved_method->signature())); 1029 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1030 } 1031 1032 if (TraceItables && Verbose) { 1033 trace_method_resolution("invokespecial resolved method: caller-class:", 1034 current_klass, resolved_klass, resolved_method); 1035 tty->cr(); 1036 } 1037 1038 return resolved_method; 1039} 1040 1041// throws runtime exceptions 1042void LinkResolver::runtime_resolve_special_method(CallInfo& result, 1043 const methodHandle& resolved_method, 1044 KlassHandle resolved_klass, 1045 KlassHandle current_klass, 1046 bool check_access, TRAPS) { 1047 1048 // resolved method is selected method unless we have an old-style lookup 1049 // for a superclass method 1050 // Invokespecial for a superinterface, resolved method is selected method, 1051 // no checks for shadowing 1052 methodHandle sel_method(THREAD, resolved_method()); 1053 1054 // check if this is an old-style super call and do a new lookup if so 1055 { KlassHandle method_klass = KlassHandle(THREAD, 1056 resolved_method->method_holder()); 1057 1058 if (check_access && 1059 // a) check if ACC_SUPER flag is set for the current class 1060 (current_klass->is_super() || !AllowNonVirtualCalls) && 1061 // b) check if the class of the resolved_klass is a superclass 1062 // (not supertype in order to exclude interface classes) of the current class. 1063 // This check is not performed for super.invoke for interface methods 1064 // in super interfaces. 1065 current_klass->is_subclass_of(resolved_klass()) && 1066 current_klass() != resolved_klass() && 1067 // c) check if the method is not <init> 1068 resolved_method->name() != vmSymbols::object_initializer_name()) { 1069 // Lookup super method 1070 KlassHandle super_klass(THREAD, current_klass->super()); 1071 sel_method = lookup_instance_method_in_klasses(super_klass, 1072 resolved_method->name(), 1073 resolved_method->signature(), CHECK); 1074 // check if found 1075 if (sel_method.is_null()) { 1076 ResourceMark rm(THREAD); 1077 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), 1078 Method::name_and_sig_as_C_string(resolved_klass(), 1079 resolved_method->name(), 1080 resolved_method->signature())); 1081 } 1082 } 1083 } 1084 1085 // check if not static 1086 if (sel_method->is_static()) { 1087 ResourceMark rm(THREAD); 1088 char buf[200]; 1089 jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass(), 1090 resolved_method->name(), 1091 resolved_method->signature())); 1092 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1093 } 1094 1095 // check if abstract 1096 if (sel_method->is_abstract()) { 1097 ResourceMark rm(THREAD); 1098 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), 1099 Method::name_and_sig_as_C_string(resolved_klass(), 1100 sel_method->name(), 1101 sel_method->signature())); 1102 } 1103 1104 if (TraceItables && Verbose) { 1105 trace_method_resolution("invokespecial selected method: resolved-class:", 1106 resolved_klass, resolved_klass, sel_method); 1107 tty->cr(); 1108 } 1109 1110 // setup result 1111 result.set_static(resolved_klass, sel_method, CHECK); 1112} 1113 1114void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, KlassHandle receiver_klass, 1115 const LinkInfo& link_info, 1116 bool check_null_and_abstract, TRAPS) { 1117 methodHandle resolved_method = linktime_resolve_virtual_method(link_info, CHECK); 1118 runtime_resolve_virtual_method(result, resolved_method, 1119 link_info.resolved_klass(), 1120 recv, receiver_klass, 1121 check_null_and_abstract, CHECK); 1122} 1123 1124// throws linktime exceptions 1125methodHandle LinkResolver::linktime_resolve_virtual_method(const LinkInfo& link_info, 1126 TRAPS) { 1127 // normal method resolution 1128 methodHandle resolved_method = resolve_method(link_info, /*require_methodref*/true, CHECK_NULL); 1129 1130 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier"); 1131 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier"); 1132 1133 // check if private interface method 1134 KlassHandle resolved_klass = link_info.resolved_klass(); 1135 KlassHandle current_klass = link_info.current_klass(); 1136 1137 if (resolved_klass->is_interface() && resolved_method->is_private()) { 1138 ResourceMark rm(THREAD); 1139 char buf[200]; 1140 jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokevirtual: method %s, caller-class:%s", 1141 Method::name_and_sig_as_C_string(resolved_klass(), 1142 resolved_method->name(), 1143 resolved_method->signature()), 1144 (current_klass.is_null() ? "<NULL>" : current_klass->internal_name())); 1145 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1146 } 1147 1148 // check if not static 1149 if (resolved_method->is_static()) { 1150 ResourceMark rm(THREAD); 1151 char buf[200]; 1152 jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass(), 1153 resolved_method->name(), 1154 resolved_method->signature())); 1155 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1156 } 1157 1158 if (PrintVtables && Verbose) { 1159 trace_method_resolution("invokevirtual resolved method: caller-class:", 1160 current_klass, resolved_klass, resolved_method); 1161 tty->cr(); 1162 } 1163 1164 return resolved_method; 1165} 1166 1167// throws runtime exceptions 1168void LinkResolver::runtime_resolve_virtual_method(CallInfo& result, 1169 const methodHandle& resolved_method, 1170 KlassHandle resolved_klass, 1171 Handle recv, 1172 KlassHandle recv_klass, 1173 bool check_null_and_abstract, 1174 TRAPS) { 1175 1176 // setup default return values 1177 int vtable_index = Method::invalid_vtable_index; 1178 methodHandle selected_method; 1179 1180 assert(recv.is_null() || recv->is_oop(), "receiver is not an oop"); 1181 1182 // runtime method resolution 1183 if (check_null_and_abstract && recv.is_null()) { // check if receiver exists 1184 THROW(vmSymbols::java_lang_NullPointerException()); 1185 } 1186 1187 // Virtual methods cannot be resolved before its klass has been linked, for otherwise the Method*'s 1188 // has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since 1189 // a missing receiver might result in a bogus lookup. 1190 assert(resolved_method->method_holder()->is_linked(), "must be linked"); 1191 1192 // do lookup based on receiver klass using the vtable index 1193 if (resolved_method->method_holder()->is_interface()) { // default or miranda method 1194 vtable_index = vtable_index_of_interface_method(resolved_klass, 1195 resolved_method); 1196 assert(vtable_index >= 0 , "we should have valid vtable index at this point"); 1197 1198 InstanceKlass* inst = InstanceKlass::cast(recv_klass()); 1199 selected_method = methodHandle(THREAD, inst->method_at_vtable(vtable_index)); 1200 } else { 1201 // at this point we are sure that resolved_method is virtual and not 1202 // a default or miranda method; therefore, it must have a valid vtable index. 1203 assert(!resolved_method->has_itable_index(), ""); 1204 vtable_index = resolved_method->vtable_index(); 1205 // We could get a negative vtable_index for final methods, 1206 // because as an optimization they are they are never put in the vtable, 1207 // unless they override an existing method. 1208 // If we do get a negative, it means the resolved method is the the selected 1209 // method, and it can never be changed by an override. 1210 if (vtable_index == Method::nonvirtual_vtable_index) { 1211 assert(resolved_method->can_be_statically_bound(), "cannot override this method"); 1212 selected_method = resolved_method; 1213 } else { 1214 // recv_klass might be an arrayKlassOop but all vtables start at 1215 // the same place. The cast is to avoid virtual call and assertion. 1216 InstanceKlass* inst = (InstanceKlass*)recv_klass(); 1217 selected_method = methodHandle(THREAD, inst->method_at_vtable(vtable_index)); 1218 } 1219 } 1220 1221 // check if method exists 1222 if (selected_method.is_null()) { 1223 ResourceMark rm(THREAD); 1224 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), 1225 Method::name_and_sig_as_C_string(resolved_klass(), 1226 resolved_method->name(), 1227 resolved_method->signature())); 1228 } 1229 1230 // check if abstract 1231 if (check_null_and_abstract && selected_method->is_abstract()) { 1232 ResourceMark rm(THREAD); 1233 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), 1234 Method::name_and_sig_as_C_string(resolved_klass(), 1235 selected_method->name(), 1236 selected_method->signature())); 1237 } 1238 1239 if (PrintVtables && Verbose) { 1240 trace_method_resolution("invokevirtual selected method: receiver-class:", 1241 recv_klass, resolved_klass, selected_method); 1242 tty->print_cr("vtable_index:%d", vtable_index); 1243 } 1244 // setup result 1245 result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK); 1246} 1247 1248void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, KlassHandle recv_klass, 1249 const LinkInfo& link_info, 1250 bool check_null_and_abstract, TRAPS) { 1251 // throws linktime exceptions 1252 methodHandle resolved_method = linktime_resolve_interface_method(link_info, CHECK); 1253 runtime_resolve_interface_method(result, resolved_method,link_info.resolved_klass(), 1254 recv, recv_klass, check_null_and_abstract, CHECK); 1255} 1256 1257methodHandle LinkResolver::linktime_resolve_interface_method(const LinkInfo& link_info, 1258 TRAPS) { 1259 // normal interface method resolution 1260 methodHandle resolved_method = resolve_interface_method(link_info, true, CHECK_NULL); 1261 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier"); 1262 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier"); 1263 1264 return resolved_method; 1265} 1266 1267// throws runtime exceptions 1268void LinkResolver::runtime_resolve_interface_method(CallInfo& result, 1269 const methodHandle& resolved_method, 1270 KlassHandle resolved_klass, 1271 Handle recv, 1272 KlassHandle recv_klass, 1273 bool check_null_and_abstract, TRAPS) { 1274 // check if receiver exists 1275 if (check_null_and_abstract && recv.is_null()) { 1276 THROW(vmSymbols::java_lang_NullPointerException()); 1277 } 1278 1279 // check if private interface method 1280 if (resolved_klass->is_interface() && resolved_method->is_private()) { 1281 ResourceMark rm(THREAD); 1282 char buf[200]; 1283 jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokeinterface: method %s", 1284 Method::name_and_sig_as_C_string(resolved_klass(), 1285 resolved_method->name(), 1286 resolved_method->signature())); 1287 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1288 } 1289 1290 // check if receiver klass implements the resolved interface 1291 if (!recv_klass->is_subtype_of(resolved_klass())) { 1292 ResourceMark rm(THREAD); 1293 char buf[200]; 1294 jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s", 1295 recv_klass()->external_name(), 1296 resolved_klass()->external_name()); 1297 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1298 } 1299 1300 // do lookup based on receiver klass 1301 // This search must match the linktime preparation search for itable initialization 1302 // to correctly enforce loader constraints for interface method inheritance 1303 methodHandle sel_method = lookup_instance_method_in_klasses(recv_klass, 1304 resolved_method->name(), 1305 resolved_method->signature(), CHECK); 1306 if (sel_method.is_null() && !check_null_and_abstract) { 1307 // In theory this is a harmless placeholder value, but 1308 // in practice leaving in null affects the nsk default method tests. 1309 // This needs further study. 1310 sel_method = resolved_method; 1311 } 1312 // check if method exists 1313 if (sel_method.is_null()) { 1314 ResourceMark rm(THREAD); 1315 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), 1316 Method::name_and_sig_as_C_string(recv_klass(), 1317 resolved_method->name(), 1318 resolved_method->signature())); 1319 } 1320 // check access 1321 // Throw Illegal Access Error if sel_method is not public. 1322 if (!sel_method->is_public()) { 1323 ResourceMark rm(THREAD); 1324 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), 1325 Method::name_and_sig_as_C_string(recv_klass(), 1326 sel_method->name(), 1327 sel_method->signature())); 1328 } 1329 // check if abstract 1330 if (check_null_and_abstract && sel_method->is_abstract()) { 1331 ResourceMark rm(THREAD); 1332 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), 1333 Method::name_and_sig_as_C_string(recv_klass(), 1334 sel_method->name(), 1335 sel_method->signature())); 1336 } 1337 1338 if (TraceItables && Verbose) { 1339 trace_method_resolution("invokeinterface selected method: receiver-class", 1340 recv_klass, resolved_klass, sel_method); 1341 tty->cr(); 1342 } 1343 // setup result 1344 if (!resolved_method->has_itable_index()) { 1345 int vtable_index = resolved_method->vtable_index(); 1346 assert(vtable_index == sel_method->vtable_index(), "sanity check"); 1347 result.set_virtual(resolved_klass, recv_klass, resolved_method, sel_method, vtable_index, CHECK); 1348 } else { 1349 int itable_index = resolved_method()->itable_index(); 1350 result.set_interface(resolved_klass, recv_klass, resolved_method, sel_method, itable_index, CHECK); 1351 } 1352} 1353 1354 1355methodHandle LinkResolver::linktime_resolve_interface_method_or_null( 1356 const LinkInfo& link_info) { 1357 EXCEPTION_MARK; 1358 methodHandle method_result = linktime_resolve_interface_method(link_info, THREAD); 1359 if (HAS_PENDING_EXCEPTION) { 1360 CLEAR_PENDING_EXCEPTION; 1361 return methodHandle(); 1362 } else { 1363 return method_result; 1364 } 1365} 1366 1367methodHandle LinkResolver::linktime_resolve_virtual_method_or_null( 1368 const LinkInfo& link_info) { 1369 EXCEPTION_MARK; 1370 methodHandle method_result = linktime_resolve_virtual_method(link_info, THREAD); 1371 if (HAS_PENDING_EXCEPTION) { 1372 CLEAR_PENDING_EXCEPTION; 1373 return methodHandle(); 1374 } else { 1375 return method_result; 1376 } 1377} 1378 1379methodHandle LinkResolver::resolve_virtual_call_or_null( 1380 KlassHandle receiver_klass, 1381 const LinkInfo& link_info) { 1382 EXCEPTION_MARK; 1383 CallInfo info; 1384 resolve_virtual_call(info, Handle(), receiver_klass, link_info, false, THREAD); 1385 if (HAS_PENDING_EXCEPTION) { 1386 CLEAR_PENDING_EXCEPTION; 1387 return methodHandle(); 1388 } 1389 return info.selected_method(); 1390} 1391 1392methodHandle LinkResolver::resolve_interface_call_or_null( 1393 KlassHandle receiver_klass, 1394 const LinkInfo& link_info) { 1395 EXCEPTION_MARK; 1396 CallInfo info; 1397 resolve_interface_call(info, Handle(), receiver_klass, link_info, false, THREAD); 1398 if (HAS_PENDING_EXCEPTION) { 1399 CLEAR_PENDING_EXCEPTION; 1400 return methodHandle(); 1401 } 1402 return info.selected_method(); 1403} 1404 1405int LinkResolver::resolve_virtual_vtable_index(KlassHandle receiver_klass, 1406 const LinkInfo& link_info) { 1407 EXCEPTION_MARK; 1408 CallInfo info; 1409 resolve_virtual_call(info, Handle(), receiver_klass, link_info, 1410 /*check_null_or_abstract*/false, THREAD); 1411 if (HAS_PENDING_EXCEPTION) { 1412 CLEAR_PENDING_EXCEPTION; 1413 return Method::invalid_vtable_index; 1414 } 1415 return info.vtable_index(); 1416} 1417 1418methodHandle LinkResolver::resolve_static_call_or_null(const LinkInfo& link_info) { 1419 EXCEPTION_MARK; 1420 CallInfo info; 1421 resolve_static_call(info, link_info, /*initialize_class*/false, THREAD); 1422 if (HAS_PENDING_EXCEPTION) { 1423 CLEAR_PENDING_EXCEPTION; 1424 return methodHandle(); 1425 } 1426 return info.selected_method(); 1427} 1428 1429methodHandle LinkResolver::resolve_special_call_or_null(const LinkInfo& link_info) { 1430 EXCEPTION_MARK; 1431 CallInfo info; 1432 resolve_special_call(info, link_info, THREAD); 1433 if (HAS_PENDING_EXCEPTION) { 1434 CLEAR_PENDING_EXCEPTION; 1435 return methodHandle(); 1436 } 1437 return info.selected_method(); 1438} 1439 1440 1441 1442//------------------------------------------------------------------------------------------------------------------------ 1443// ConstantPool entries 1444 1445void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, constantPoolHandle pool, int index, Bytecodes::Code byte, TRAPS) { 1446 switch (byte) { 1447 case Bytecodes::_invokestatic : resolve_invokestatic (result, pool, index, CHECK); break; 1448 case Bytecodes::_invokespecial : resolve_invokespecial (result, pool, index, CHECK); break; 1449 case Bytecodes::_invokevirtual : resolve_invokevirtual (result, recv, pool, index, CHECK); break; 1450 case Bytecodes::_invokehandle : resolve_invokehandle (result, pool, index, CHECK); break; 1451 case Bytecodes::_invokedynamic : resolve_invokedynamic (result, pool, index, CHECK); break; 1452 case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break; 1453 } 1454 return; 1455} 1456 1457void LinkResolver::resolve_invokestatic(CallInfo& result, constantPoolHandle pool, int index, TRAPS) { 1458 LinkInfo link_info(pool, index, CHECK); 1459 resolve_static_call(result, link_info, /*initialize_class*/true, CHECK); 1460} 1461 1462 1463void LinkResolver::resolve_invokespecial(CallInfo& result, constantPoolHandle pool, int index, TRAPS) { 1464 LinkInfo link_info(pool, index, CHECK); 1465 resolve_special_call(result, link_info, CHECK); 1466} 1467 1468 1469void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv, 1470 constantPoolHandle pool, int index, 1471 TRAPS) { 1472 1473 LinkInfo link_info(pool, index, CHECK); 1474 KlassHandle recvrKlass (THREAD, recv.is_null() ? (Klass*)NULL : recv->klass()); 1475 resolve_virtual_call(result, recv, recvrKlass, link_info, /*check_null_or_abstract*/true, CHECK); 1476} 1477 1478 1479void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, constantPoolHandle pool, int index, TRAPS) { 1480 LinkInfo link_info(pool, index, CHECK); 1481 KlassHandle recvrKlass (THREAD, recv.is_null() ? (Klass*)NULL : recv->klass()); 1482 resolve_interface_call(result, recv, recvrKlass, link_info, true, CHECK); 1483} 1484 1485 1486void LinkResolver::resolve_invokehandle(CallInfo& result, constantPoolHandle pool, int index, TRAPS) { 1487 // This guy is reached from InterpreterRuntime::resolve_invokehandle. 1488 LinkInfo link_info(pool, index, CHECK); 1489 if (TraceMethodHandles) { 1490 ResourceMark rm(THREAD); 1491 tty->print_cr("resolve_invokehandle %s %s", link_info.name()->as_C_string(), 1492 link_info.signature()->as_C_string()); 1493 } 1494 resolve_handle_call(result, link_info, CHECK); 1495} 1496 1497void LinkResolver::resolve_handle_call(CallInfo& result, 1498 const LinkInfo& link_info, 1499 TRAPS) { 1500 // JSR 292: this must be an implicitly generated method MethodHandle.invokeExact(*...) or similar 1501 assert(link_info.resolved_klass()() == SystemDictionary::MethodHandle_klass(), ""); 1502 assert(MethodHandles::is_signature_polymorphic_name(link_info.name()), ""); 1503 Handle resolved_appendix; 1504 Handle resolved_method_type; 1505 methodHandle resolved_method = lookup_polymorphic_method(link_info, 1506 &resolved_appendix, &resolved_method_type, CHECK); 1507 result.set_handle(resolved_method, resolved_appendix, resolved_method_type, CHECK); 1508} 1509 1510static void wrap_invokedynamic_exception(TRAPS) { 1511 if (HAS_PENDING_EXCEPTION) { 1512 if (TraceMethodHandles) { 1513 tty->print_cr("invokedynamic throws BSME for " INTPTR_FORMAT, p2i((void *)PENDING_EXCEPTION)); 1514 PENDING_EXCEPTION->print(); 1515 } 1516 if (PENDING_EXCEPTION->is_a(SystemDictionary::BootstrapMethodError_klass())) { 1517 // throw these guys, since they are already wrapped 1518 return; 1519 } 1520 if (!PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { 1521 // intercept only LinkageErrors which might have failed to wrap 1522 return; 1523 } 1524 // See the "Linking Exceptions" section for the invokedynamic instruction in the JVMS. 1525 Handle nested_exception(THREAD, PENDING_EXCEPTION); 1526 CLEAR_PENDING_EXCEPTION; 1527 THROW_CAUSE(vmSymbols::java_lang_BootstrapMethodError(), nested_exception) 1528 } 1529} 1530 1531void LinkResolver::resolve_invokedynamic(CallInfo& result, constantPoolHandle pool, int index, TRAPS) { 1532 Symbol* method_name = pool->name_ref_at(index); 1533 Symbol* method_signature = pool->signature_ref_at(index); 1534 KlassHandle current_klass = KlassHandle(THREAD, pool->pool_holder()); 1535 1536 // Resolve the bootstrap specifier (BSM + optional arguments). 1537 Handle bootstrap_specifier; 1538 // Check if CallSite has been bound already: 1539 ConstantPoolCacheEntry* cpce = pool->invokedynamic_cp_cache_entry_at(index); 1540 if (cpce->is_f1_null()) { 1541 int pool_index = cpce->constant_pool_index(); 1542 oop bsm_info = pool->resolve_bootstrap_specifier_at(pool_index, THREAD); 1543 wrap_invokedynamic_exception(CHECK); 1544 assert(bsm_info != NULL, ""); 1545 // FIXME: Cache this once per BootstrapMethods entry, not once per CONSTANT_InvokeDynamic. 1546 bootstrap_specifier = Handle(THREAD, bsm_info); 1547 } 1548 if (!cpce->is_f1_null()) { 1549 methodHandle method( THREAD, cpce->f1_as_method()); 1550 Handle appendix( THREAD, cpce->appendix_if_resolved(pool)); 1551 Handle method_type(THREAD, cpce->method_type_if_resolved(pool)); 1552 result.set_handle(method, appendix, method_type, THREAD); 1553 wrap_invokedynamic_exception(CHECK); 1554 return; 1555 } 1556 1557 if (TraceMethodHandles) { 1558 ResourceMark rm(THREAD); 1559 tty->print_cr("resolve_invokedynamic #%d %s %s", 1560 ConstantPool::decode_invokedynamic_index(index), 1561 method_name->as_C_string(), method_signature->as_C_string()); 1562 tty->print(" BSM info: "); bootstrap_specifier->print(); 1563 } 1564 1565 resolve_dynamic_call(result, bootstrap_specifier, method_name, method_signature, current_klass, CHECK); 1566} 1567 1568void LinkResolver::resolve_dynamic_call(CallInfo& result, 1569 Handle bootstrap_specifier, 1570 Symbol* method_name, Symbol* method_signature, 1571 KlassHandle current_klass, 1572 TRAPS) { 1573 // JSR 292: this must resolve to an implicitly generated method MH.linkToCallSite(*...) 1574 // The appendix argument is likely to be a freshly-created CallSite. 1575 Handle resolved_appendix; 1576 Handle resolved_method_type; 1577 methodHandle resolved_method = 1578 SystemDictionary::find_dynamic_call_site_invoker(current_klass, 1579 bootstrap_specifier, 1580 method_name, method_signature, 1581 &resolved_appendix, 1582 &resolved_method_type, 1583 THREAD); 1584 wrap_invokedynamic_exception(CHECK); 1585 result.set_handle(resolved_method, resolved_appendix, resolved_method_type, THREAD); 1586 wrap_invokedynamic_exception(CHECK); 1587} 1588 1589#ifndef PRODUCT 1590void LinkResolver::trace_method_resolution(const char* prefix, 1591 KlassHandle klass, 1592 KlassHandle resolved_klass, 1593 const methodHandle& method) { 1594 ResourceMark rm; 1595 tty->print("%s%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ", 1596 prefix, 1597 (klass.is_null() ? "<NULL>" : klass->internal_name()), 1598 (resolved_klass.is_null() ? "<NULL>" : resolved_klass->internal_name()), 1599 Method::name_and_sig_as_C_string(resolved_klass(), 1600 method->name(), 1601 method->signature()), 1602 method->method_holder()->internal_name() 1603 ); 1604 method->access_flags().print_on(tty); 1605 if (method->is_default_method()) { 1606 tty->print("default "); 1607 } 1608 if (method->is_overpass()) { 1609 tty->print("overpass "); 1610 } 1611} 1612#endif // PRODUCT 1613