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 
  55 void 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 
  61 void 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 
  75 void 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 
  87 void 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 
 104 void 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->can_call_java()) {
 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
 148 CallInfo::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
 203 void CallInfo::verify() {
 204   switch (call_kind()) {  // the meaning and allowed value of index depends on kind
 205   case CallInfo::direct_call:
 206     if (_call_index == Method::nonvirtual_vtable_index)  break;
 207     // else fall through to check vtable index:
 208   case CallInfo::vtable_call:
 209     assert(resolved_klass()->verify_vtable_index(_call_index), "");
 210     break;
 211   case CallInfo::itable_call:
 212     assert(resolved_method()->method_holder()->verify_itable_index(_call_index), "");
 213     break;
 214   case CallInfo::unknown_kind:
 215     assert(call_kind() != CallInfo::unknown_kind, "CallInfo must be set");
 216     break;
 217   default:
 218     fatal("Unexpected call kind %d", call_kind());
 219   }
 220 }
 221 #endif //ASSERT
 222 
 223 #ifndef PRODUCT
 224 void CallInfo::print() {
 225   ResourceMark rm;
 226   const char* kindstr = "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 
 240 LinkInfo::LinkInfo(const 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 
 254 char* LinkInfo::method_string() const {
 255   return Method::name_and_sig_as_C_string(_resolved_klass(), _name, _signature);
 256 }
 257 
 258 #ifndef PRODUCT
 259 void 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 
 272 void 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
 295 methodHandle 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->is_array_klass()) {
 306     // Only consider klass and super klass for arrays
 307     return methodHandle(THREAD, result);
 308   }
 309 
 310   InstanceKlass* ik = InstanceKlass::cast(klass());
 311 
 312   // JDK 8, JVMS 5.4.3.4: Interface method resolution should
 313   // ignore static and non-public methods of java.lang.Object,
 314   // like clone, finalize, registerNatives.
 315   if (in_imethod_resolve &&
 316       result != NULL &&
 317       ik->is_interface() &&
 318       (result->is_static() || !result->is_public()) &&
 319       result->method_holder() == SystemDictionary::Object_klass()) {
 320     result = NULL;
 321   }
 322 
 323   // Before considering default methods, check for an overpass in the
 324   // current class if a method has not been found.
 325   if (result == NULL) {
 326     result = ik->find_method(name, signature);
 327   }
 328 
 329   if (result == NULL) {
 330     Array<Method*>* default_methods = ik->default_methods();
 331     if (default_methods != NULL) {
 332       result = InstanceKlass::find_method(default_methods, name, signature);
 333     }
 334   }
 335 
 336   if (checkpolymorphism && result != NULL) {
 337     vmIntrinsics::ID iid = result->intrinsic_id();
 338     if (MethodHandles::is_signature_polymorphic(iid)) {
 339       // Do not link directly to these.  The VM must produce a synthetic one using lookup_polymorphic_method.
 340       return NULL;
 341     }
 342   }
 343   return methodHandle(THREAD, result);
 344 }
 345 
 346 // returns first instance method
 347 // Looks up method in classes, then looks up local default methods
 348 methodHandle LinkResolver::lookup_instance_method_in_klasses(KlassHandle klass,
 349                                                              Symbol* name,
 350                                                              Symbol* signature, TRAPS) {
 351   Method* result = klass->uncached_lookup_method(name, signature, Klass::find_overpass);
 352 
 353   while (result != NULL && result->is_static() && result->method_holder()->super() != NULL) {
 354     Klass* super_klass = result->method_holder()->super();
 355     result = super_klass->uncached_lookup_method(name, signature, Klass::find_overpass);
 356   }
 357 
 358   if (klass->is_array_klass()) {
 359     // Only consider klass and super klass for arrays
 360     return methodHandle(THREAD, result);
 361   }
 362 
 363   if (result == NULL) {
 364     Array<Method*>* default_methods = InstanceKlass::cast(klass())->default_methods();
 365     if (default_methods != NULL) {
 366       result = InstanceKlass::find_method(default_methods, name, signature);
 367       assert(result == NULL || !result->is_static(), "static defaults not allowed");
 368     }
 369   }
 370   return methodHandle(THREAD, result);
 371 }
 372 
 373 int LinkResolver::vtable_index_of_interface_method(KlassHandle klass,
 374                                                    const methodHandle& resolved_method) {
 375 
 376   int vtable_index = Method::invalid_vtable_index;
 377   Symbol* name = resolved_method->name();
 378   Symbol* signature = resolved_method->signature();
 379   InstanceKlass* ik = InstanceKlass::cast(klass());
 380 
 381   // First check in default method array
 382   if (!resolved_method->is_abstract() && ik->default_methods() != NULL) {
 383     int index = InstanceKlass::find_method_index(ik->default_methods(),
 384                                                  name, signature, Klass::find_overpass,
 385                                                  Klass::find_static, Klass::find_private);
 386     if (index >= 0 ) {
 387       vtable_index = ik->default_vtable_indices()->at(index);
 388     }
 389   }
 390   if (vtable_index == Method::invalid_vtable_index) {
 391     // get vtable_index for miranda methods
 392     ResourceMark rm;
 393     klassVtable *vt = ik->vtable();
 394     vtable_index = vt->index_of_miranda(name, signature);
 395   }
 396   return vtable_index;
 397 }
 398 
 399 methodHandle LinkResolver::lookup_method_in_interfaces(const LinkInfo& cp_info, TRAPS) {
 400   InstanceKlass *ik = InstanceKlass::cast(cp_info.resolved_klass()());
 401 
 402   // Specify 'true' in order to skip default methods when searching the
 403   // interfaces.  Function lookup_method_in_klasses() already looked for
 404   // the method in the default methods table.
 405   return methodHandle(THREAD,
 406     ik->lookup_method_in_all_interfaces(cp_info.name(), cp_info.signature(),
 407     Klass::skip_defaults));
 408 }
 409 
 410 methodHandle LinkResolver::lookup_polymorphic_method(
 411                                              const LinkInfo& link_info,
 412                                              Handle *appendix_result_or_null,
 413                                              Handle *method_type_result,
 414                                              TRAPS) {
 415   KlassHandle klass = link_info.resolved_klass();
 416   Symbol* name = link_info.name();
 417   Symbol* full_signature = link_info.signature();
 418 
 419   vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name);
 420   if (TraceMethodHandles) {
 421     ResourceMark rm(THREAD);
 422     tty->print_cr("lookup_polymorphic_method iid=%s %s.%s%s",
 423                   vmIntrinsics::name_at(iid), klass->external_name(),
 424                   name->as_C_string(), full_signature->as_C_string());
 425   }
 426   if (klass() == SystemDictionary::MethodHandle_klass() &&
 427       iid != vmIntrinsics::_none) {
 428     if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) {
 429       // Most of these do not need an up-call to Java to resolve, so can be done anywhere.
 430       // Do not erase last argument type (MemberName) if it is a static linkTo method.
 431       bool keep_last_arg = MethodHandles::is_signature_polymorphic_static(iid);
 432       TempNewSymbol basic_signature =
 433         MethodHandles::lookup_basic_type_signature(full_signature, keep_last_arg, CHECK_NULL);
 434       if (TraceMethodHandles) {
 435         ResourceMark rm(THREAD);
 436         tty->print_cr("lookup_polymorphic_method %s %s => basic %s",
 437                       name->as_C_string(),
 438                       full_signature->as_C_string(),
 439                       basic_signature->as_C_string());
 440       }
 441       methodHandle result = SystemDictionary::find_method_handle_intrinsic(iid,
 442                                                               basic_signature,
 443                                                               CHECK_NULL);
 444       if (result.not_null()) {
 445         assert(result->is_method_handle_intrinsic(), "MH.invokeBasic or MH.linkTo* intrinsic");
 446         assert(result->intrinsic_id() != vmIntrinsics::_invokeGeneric, "wrong place to find this");
 447         assert(basic_signature == result->signature(), "predict the result signature");
 448         if (TraceMethodHandles) {
 449           tty->print("lookup_polymorphic_method => intrinsic ");
 450           result->print_on(tty);
 451         }
 452       }
 453       return result;
 454     } else if (iid == vmIntrinsics::_invokeGeneric
 455                && THREAD->can_call_java()
 456                && appendix_result_or_null != NULL) {
 457       // This is a method with type-checking semantics.
 458       // We will ask Java code to spin an adapter method for it.
 459       if (!MethodHandles::enabled()) {
 460         // Make sure the Java part of the runtime has been booted up.
 461         Klass* natives = SystemDictionary::MethodHandleNatives_klass();
 462         if (natives == NULL || InstanceKlass::cast(natives)->is_not_initialized()) {
 463           SystemDictionary::resolve_or_fail(vmSymbols::java_lang_invoke_MethodHandleNatives(),
 464                                             Handle(),
 465                                             Handle(),
 466                                             true,
 467                                             CHECK_NULL);
 468         }
 469       }
 470 
 471       Handle appendix;
 472       Handle method_type;
 473       methodHandle result = SystemDictionary::find_method_handle_invoker(
 474                                                             name,
 475                                                             full_signature,
 476                                                             link_info.current_klass(),
 477                                                             &appendix,
 478                                                             &method_type,
 479                                                             CHECK_NULL);
 480       if (TraceMethodHandles) {
 481         tty->print("lookup_polymorphic_method => (via Java) ");
 482         result->print_on(tty);
 483         tty->print("  lookup_polymorphic_method => appendix = ");
 484         if (appendix.is_null())  tty->print_cr("(none)");
 485         else                     appendix->print_on(tty);
 486       }
 487       if (result.not_null()) {
 488 #ifdef ASSERT
 489         ResourceMark rm(THREAD);
 490 
 491         TempNewSymbol basic_signature =
 492           MethodHandles::lookup_basic_type_signature(full_signature, CHECK_NULL);
 493         int actual_size_of_params = result->size_of_parameters();
 494         int expected_size_of_params = ArgumentSizeComputer(basic_signature).size();
 495         // +1 for MethodHandle.this, +1 for trailing MethodType
 496         if (!MethodHandles::is_signature_polymorphic_static(iid))  expected_size_of_params += 1;
 497         if (appendix.not_null())                                   expected_size_of_params += 1;
 498         if (actual_size_of_params != expected_size_of_params) {
 499           tty->print_cr("*** basic_signature=%s", basic_signature->as_C_string());
 500           tty->print_cr("*** result for %s: ", vmIntrinsics::name_at(iid));
 501           result->print();
 502         }
 503         assert(actual_size_of_params == expected_size_of_params,
 504                "%d != %d", actual_size_of_params, expected_size_of_params);
 505 #endif //ASSERT
 506 
 507         assert(appendix_result_or_null != NULL, "");
 508         (*appendix_result_or_null) = appendix;
 509         (*method_type_result)      = method_type;
 510       }
 511       return result;
 512     }
 513   }
 514   return NULL;
 515 }
 516 
 517 void LinkResolver::check_method_accessability(KlassHandle ref_klass,
 518                                               KlassHandle resolved_klass,
 519                                               KlassHandle sel_klass,
 520                                               const methodHandle& sel_method,
 521                                               TRAPS) {
 522 
 523   AccessFlags flags = sel_method->access_flags();
 524 
 525   // Special case:  arrays always override "clone". JVMS 2.15.
 526   // If the resolved klass is an array class, and the declaring class
 527   // is java.lang.Object and the method is "clone", set the flags
 528   // to public.
 529   //
 530   // We'll check for the method name first, as that's most likely
 531   // to be false (so we'll short-circuit out of these tests).
 532   if (sel_method->name() == vmSymbols::clone_name() &&
 533       sel_klass() == SystemDictionary::Object_klass() &&
 534       resolved_klass->is_array_klass()) {
 535     // We need to change "protected" to "public".
 536     assert(flags.is_protected(), "clone not protected?");
 537     jint new_flags = flags.as_int();
 538     new_flags = new_flags & (~JVM_ACC_PROTECTED);
 539     new_flags = new_flags | JVM_ACC_PUBLIC;
 540     flags.set_flags(new_flags);
 541   }
 542 //  assert(extra_arg_result_or_null != NULL, "must be able to return extra argument");
 543 
 544   if (!Reflection::verify_field_access(ref_klass(),
 545                                        resolved_klass(),
 546                                        sel_klass(),
 547                                        flags,
 548                                        true)) {
 549     ResourceMark rm(THREAD);
 550     Exceptions::fthrow(
 551       THREAD_AND_LOCATION,
 552       vmSymbols::java_lang_IllegalAccessError(),
 553       "tried to access method %s.%s%s from class %s",
 554       sel_klass->external_name(),
 555       sel_method->name()->as_C_string(),
 556       sel_method->signature()->as_C_string(),
 557       ref_klass->external_name()
 558     );
 559     return;
 560   }
 561 }
 562 
 563 methodHandle LinkResolver::resolve_method_statically(Bytecodes::Code code,
 564                                                      const constantPoolHandle& pool, int index, TRAPS) {
 565   // This method is used only
 566   // (1) in C2 from InlineTree::ok_to_inline (via ciMethod::check_call),
 567   // and
 568   // (2) in Bytecode_invoke::static_target
 569   // It appears to fail when applied to an invokeinterface call site.
 570   // FIXME: Remove this method and ciMethod::check_call; refactor to use the other LinkResolver entry points.
 571   // resolve klass
 572   KlassHandle resolved_klass;
 573   if (code == Bytecodes::_invokedynamic) {
 574     resolved_klass = SystemDictionary::MethodHandle_klass();
 575     Symbol* method_name = vmSymbols::invoke_name();
 576     Symbol* method_signature = pool->signature_ref_at(index);
 577     KlassHandle  current_klass(THREAD, pool->pool_holder());
 578     LinkInfo link_info(resolved_klass, method_name, method_signature, current_klass);
 579     return resolve_method(link_info, /*require_methodref*/false, THREAD);
 580   }
 581 
 582   LinkInfo link_info(pool, index, CHECK_NULL);
 583   resolved_klass = link_info.resolved_klass();
 584 
 585   if (pool->has_preresolution()
 586       || (resolved_klass() == SystemDictionary::MethodHandle_klass() &&
 587           MethodHandles::is_signature_polymorphic_name(resolved_klass(), link_info.name()))) {
 588     Method* result = ConstantPool::method_at_if_loaded(pool, index);
 589     if (result != NULL) {
 590       return methodHandle(THREAD, result);
 591     }
 592   }
 593 
 594   if (code == Bytecodes::_invokeinterface) {
 595     return resolve_interface_method(link_info, true, THREAD);
 596   } else if (code == Bytecodes::_invokevirtual) {
 597     return resolve_method(link_info, /*require_methodref*/true, THREAD);
 598   } else if (!resolved_klass->is_interface()) {
 599     return resolve_method(link_info, /*require_methodref*/false, THREAD);
 600   } else {
 601     bool nostatics = (code == Bytecodes::_invokestatic) ? false : true;
 602     return resolve_interface_method(link_info, nostatics, THREAD);
 603   }
 604 }
 605 
 606 // Check and print a loader constraint violation message for method or interface method
 607 void LinkResolver::check_method_loader_constraints(const LinkInfo& link_info,
 608                                                    const methodHandle& resolved_method,
 609                                                    const char* method_type, TRAPS) {
 610   Handle current_loader(THREAD, link_info.current_klass()->class_loader());
 611   Handle resolved_loader(THREAD, resolved_method->method_holder()->class_loader());
 612 
 613   ResourceMark rm(THREAD);
 614   Symbol* failed_type_symbol =
 615     SystemDictionary::check_signature_loaders(link_info.signature(), current_loader,
 616                                               resolved_loader, true, CHECK);
 617   if (failed_type_symbol != NULL) {
 618     const char* msg = "loader constraint violation: when resolving %s"
 619       " \"%s\" the class loader (instance of %s) of the current class, %s,"
 620       " and the class loader (instance of %s) for the method's defining class, %s, have"
 621       " different Class objects for the type %s used in the signature";
 622     char* sig = link_info.method_string();
 623     const char* loader1_name = SystemDictionary::loader_name(current_loader());
 624     char* current = link_info.current_klass()->name()->as_C_string();
 625     const char* loader2_name = SystemDictionary::loader_name(resolved_loader());
 626     char* target = resolved_method->method_holder()->name()->as_C_string();
 627     char* failed_type_name = failed_type_symbol->as_C_string();
 628     size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1_name) +
 629       strlen(current) + strlen(loader2_name) + strlen(target) +
 630       strlen(failed_type_name) + strlen(method_type) + 1;
 631     char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen);
 632     jio_snprintf(buf, buflen, msg, method_type, sig, loader1_name, current, loader2_name,
 633                  target, failed_type_name);
 634     THROW_MSG(vmSymbols::java_lang_LinkageError(), buf);
 635   }
 636 }
 637 
 638 void LinkResolver::check_field_loader_constraints(Symbol* field, Symbol* sig,
 639                                                   KlassHandle current_klass,
 640                                                   KlassHandle sel_klass, TRAPS) {
 641   Handle ref_loader(THREAD, current_klass->class_loader());
 642   Handle sel_loader(THREAD, sel_klass->class_loader());
 643 
 644   ResourceMark rm(THREAD);  // needed for check_signature_loaders
 645   Symbol* failed_type_symbol =
 646     SystemDictionary::check_signature_loaders(sig,
 647                                               ref_loader, sel_loader,
 648                                               false,
 649                                               CHECK);
 650   if (failed_type_symbol != NULL) {
 651     const char* msg = "loader constraint violation: when resolving field"
 652       " \"%s\" the class loader (instance of %s) of the referring class, "
 653       "%s, and the class loader (instance of %s) for the field's resolved "
 654       "type, %s, have different Class objects for that type";
 655     char* field_name = field->as_C_string();
 656     const char* loader1_name = SystemDictionary::loader_name(ref_loader());
 657     char* sel = sel_klass->name()->as_C_string();
 658     const char* loader2_name = SystemDictionary::loader_name(sel_loader());
 659     char* failed_type_name = failed_type_symbol->as_C_string();
 660     size_t buflen = strlen(msg) + strlen(field_name) + strlen(loader1_name) +
 661                     strlen(sel) + strlen(loader2_name) + strlen(failed_type_name) + 1;
 662     char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen);
 663     jio_snprintf(buf, buflen, msg, field_name, loader1_name, sel, loader2_name,
 664                      failed_type_name);
 665     THROW_MSG(vmSymbols::java_lang_LinkageError(), buf);
 666   }
 667 }
 668 
 669 methodHandle LinkResolver::resolve_method(const LinkInfo& link_info,
 670                                           bool require_methodref, TRAPS) {
 671 
 672   Handle nested_exception;
 673   KlassHandle resolved_klass = link_info.resolved_klass();
 674 
 675   // 1. check if methodref required, that resolved_klass is not interfacemethodref
 676   if (require_methodref && resolved_klass->is_interface()) {
 677     ResourceMark rm(THREAD);
 678     char buf[200];
 679     jio_snprintf(buf, sizeof(buf), "Found interface %s, but class was expected",
 680         resolved_klass()->external_name());
 681     THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
 682   }
 683 
 684   // 2. lookup method in resolved klass and its super klasses
 685   methodHandle resolved_method = lookup_method_in_klasses(link_info, true, false, CHECK_NULL);
 686 
 687   if (resolved_method.is_null() && !resolved_klass->is_array_klass()) { // not found in the class hierarchy
 688     // 3. lookup method in all the interfaces implemented by the resolved klass
 689     resolved_method = lookup_method_in_interfaces(link_info, CHECK_NULL);
 690 
 691     if (resolved_method.is_null()) {
 692       // JSR 292:  see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc
 693       resolved_method = lookup_polymorphic_method(link_info, (Handle*)NULL, (Handle*)NULL, THREAD);
 694       if (HAS_PENDING_EXCEPTION) {
 695         nested_exception = Handle(THREAD, PENDING_EXCEPTION);
 696         CLEAR_PENDING_EXCEPTION;
 697       }
 698     }
 699   }
 700 
 701   if (resolved_method.is_null()) {
 702     // 4. method lookup failed
 703     ResourceMark rm(THREAD);
 704     THROW_MSG_CAUSE_(vmSymbols::java_lang_NoSuchMethodError(),
 705                     Method::name_and_sig_as_C_string(resolved_klass(),
 706                                                      link_info.name(),
 707                                                      link_info.signature()),
 708                     nested_exception, NULL);
 709   }
 710 
 711   // 5. access checks, access checking may be turned off when calling from within the VM.
 712   KlassHandle current_klass = link_info.current_klass();
 713   if (link_info.check_access()) {
 714     assert(current_klass.not_null() , "current_klass should not be null");
 715 
 716     // check if method can be accessed by the referring class
 717     check_method_accessability(current_klass,
 718                                resolved_klass,
 719                                KlassHandle(THREAD, resolved_method->method_holder()),
 720                                resolved_method,
 721                                CHECK_NULL);
 722 
 723     // check loader constraints
 724     check_method_loader_constraints(link_info, resolved_method, "method", CHECK_NULL);
 725   }
 726 
 727   return resolved_method;
 728 }
 729 
 730 methodHandle LinkResolver::resolve_interface_method(const LinkInfo& link_info,
 731                                                     bool nostatics, TRAPS) {
 732 
 733   KlassHandle resolved_klass = link_info.resolved_klass();
 734 
 735   // check if klass is interface
 736   if (!resolved_klass->is_interface()) {
 737     ResourceMark rm(THREAD);
 738     char buf[200];
 739     jio_snprintf(buf, sizeof(buf), "Found class %s, but interface was expected", resolved_klass()->external_name());
 740     THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
 741   }
 742 
 743   // lookup method in this interface or its super, java.lang.Object
 744   // JDK8: also look for static methods
 745   methodHandle resolved_method = lookup_method_in_klasses(link_info, false, true, CHECK_NULL);
 746 
 747   if (resolved_method.is_null() && !resolved_klass->is_array_klass()) {
 748     // lookup method in all the super-interfaces
 749     resolved_method = lookup_method_in_interfaces(link_info, CHECK_NULL);
 750   }
 751 
 752   if (resolved_method.is_null()) {
 753     // no method found
 754     ResourceMark rm(THREAD);
 755     THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(),
 756                    Method::name_and_sig_as_C_string(resolved_klass(),
 757                                                     link_info.name(),
 758                                                     link_info.signature()));
 759   }
 760 
 761   if (link_info.check_access()) {
 762     // JDK8 adds non-public interface methods, and accessability check requirement
 763     KlassHandle current_klass = link_info.current_klass();
 764 
 765     assert(current_klass.not_null() , "current_klass should not be null");
 766 
 767     // check if method can be accessed by the referring class
 768     check_method_accessability(current_klass,
 769                                resolved_klass,
 770                                KlassHandle(THREAD, resolved_method->method_holder()),
 771                                resolved_method,
 772                                CHECK_NULL);
 773 
 774     check_method_loader_constraints(link_info, resolved_method, "interface method", CHECK_NULL);
 775   }
 776 
 777   if (nostatics && resolved_method->is_static()) {
 778     ResourceMark rm(THREAD);
 779     char buf[200];
 780     jio_snprintf(buf, sizeof(buf), "Expected instance not static method %s",
 781                  Method::name_and_sig_as_C_string(resolved_klass(),
 782                  resolved_method->name(), resolved_method->signature()));
 783     THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
 784   }
 785 
 786   if (TraceItables && Verbose) {
 787     trace_method_resolution("invokeinterface resolved method: caller-class",
 788                             link_info.current_klass(), resolved_klass, resolved_method);
 789     tty->cr();
 790   }
 791 
 792   return resolved_method;
 793 }
 794 
 795 //------------------------------------------------------------------------------------------------------------------------
 796 // Field resolution
 797 
 798 void LinkResolver::check_field_accessability(KlassHandle ref_klass,
 799                                              KlassHandle resolved_klass,
 800                                              KlassHandle sel_klass,
 801                                              const fieldDescriptor& fd,
 802                                              TRAPS) {
 803   if (!Reflection::verify_field_access(ref_klass(),
 804                                        resolved_klass(),
 805                                        sel_klass(),
 806                                        fd.access_flags(),
 807                                        true)) {
 808     ResourceMark rm(THREAD);
 809     Exceptions::fthrow(
 810       THREAD_AND_LOCATION,
 811       vmSymbols::java_lang_IllegalAccessError(),
 812       "tried to access field %s.%s from class %s",
 813       sel_klass->external_name(),
 814       fd.name()->as_C_string(),
 815       ref_klass->external_name()
 816     );
 817     return;
 818   }
 819 }
 820 
 821 void LinkResolver::resolve_field_access(fieldDescriptor& fd, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) {
 822   LinkInfo link_info(pool, index, CHECK);
 823   resolve_field(fd, link_info, byte, true, CHECK);
 824 }
 825 
 826 void LinkResolver::resolve_field(fieldDescriptor& fd,
 827                                  const LinkInfo& link_info,
 828                                  Bytecodes::Code byte, bool initialize_class,
 829                                  TRAPS) {
 830   assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic ||
 831          byte == Bytecodes::_getfield  || byte == Bytecodes::_putfield  ||
 832          byte == Bytecodes::_nofast_getfield  || byte == Bytecodes::_nofast_putfield  ||
 833          (byte == Bytecodes::_nop && !link_info.check_access()), "bad field access bytecode");
 834 
 835   bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic);
 836   bool is_put    = (byte == Bytecodes::_putfield  || byte == Bytecodes::_putstatic || byte == Bytecodes::_nofast_putfield);
 837   // Check if there's a resolved klass containing the field
 838   KlassHandle resolved_klass = link_info.resolved_klass();
 839   Symbol* field = link_info.name();
 840   Symbol* sig = link_info.signature();
 841 
 842   if (resolved_klass.is_null()) {
 843     ResourceMark rm(THREAD);
 844     THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
 845   }
 846 
 847   // Resolve instance field
 848   KlassHandle sel_klass(THREAD, resolved_klass->find_field(field, sig, &fd));
 849   // check if field exists; i.e., if a klass containing the field def has been selected
 850   if (sel_klass.is_null()) {
 851     ResourceMark rm(THREAD);
 852     THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
 853   }
 854 
 855   if (!link_info.check_access())
 856     // Access checking may be turned off when calling from within the VM.
 857     return;
 858 
 859   // check access
 860   KlassHandle current_klass = link_info.current_klass();
 861   check_field_accessability(current_klass, resolved_klass, sel_klass, fd, CHECK);
 862 
 863   // check for errors
 864   if (is_static != fd.is_static()) {
 865     ResourceMark rm(THREAD);
 866     char msg[200];
 867     jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", resolved_klass()->external_name(), fd.name()->as_C_string());
 868     THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg);
 869   }
 870 
 871   // Final fields can only be accessed from its own class.
 872   if (is_put && fd.access_flags().is_final() && sel_klass() != current_klass()) {
 873     THROW(vmSymbols::java_lang_IllegalAccessError());
 874   }
 875 
 876   // initialize resolved_klass if necessary
 877   // note 1: the klass which declared the field must be initialized (i.e, sel_klass)
 878   //         according to the newest JVM spec (5.5, p.170) - was bug (gri 7/28/99)
 879   //
 880   // note 2: we don't want to force initialization if we are just checking
 881   //         if the field access is legal; e.g., during compilation
 882   if (is_static && initialize_class) {
 883     sel_klass->initialize(CHECK);
 884   }
 885 
 886   if (sel_klass() != current_klass()) {
 887     check_field_loader_constraints(field, sig, current_klass, sel_klass, CHECK);
 888   }
 889 
 890   // return information. note that the klass is set to the actual klass containing the
 891   // field, otherwise access of static fields in superclasses will not work.
 892 }
 893 
 894 
 895 //------------------------------------------------------------------------------------------------------------------------
 896 // Invoke resolution
 897 //
 898 // Naming conventions:
 899 //
 900 // resolved_method    the specified method (i.e., static receiver specified via constant pool index)
 901 // sel_method         the selected method  (selected via run-time lookup; e.g., based on dynamic receiver class)
 902 // resolved_klass     the specified klass  (i.e., specified via constant pool index)
 903 // recv_klass         the receiver klass
 904 
 905 
 906 void LinkResolver::resolve_static_call(CallInfo& result,
 907                                        const LinkInfo& link_info,
 908                                        bool initialize_class, TRAPS) {
 909   methodHandle resolved_method = linktime_resolve_static_method(link_info, CHECK);
 910 
 911   // The resolved class can change as a result of this resolution.
 912   KlassHandle resolved_klass = KlassHandle(THREAD, resolved_method->method_holder());
 913 
 914   Method* save_resolved_method = resolved_method();
 915   // Initialize klass (this should only happen if everything is ok)
 916   if (initialize_class && resolved_klass->should_be_initialized()) {
 917     resolved_klass->initialize(CHECK);
 918     // Use updated LinkInfo (to reresolve with resolved_klass as method_holder?)
 919     LinkInfo new_info(resolved_klass, link_info.name(), link_info.signature(),
 920                       link_info.current_klass(), link_info.check_access());
 921     resolved_method = linktime_resolve_static_method(new_info, CHECK);
 922   }
 923 
 924   assert(save_resolved_method == resolved_method(), "does this change?");
 925   // setup result
 926   result.set_static(resolved_klass, resolved_method, CHECK);
 927 }
 928 
 929 // throws linktime exceptions
 930 methodHandle LinkResolver::linktime_resolve_static_method(const LinkInfo& link_info, TRAPS) {
 931 
 932   KlassHandle resolved_klass = link_info.resolved_klass();
 933   methodHandle resolved_method;
 934   if (!resolved_klass->is_interface()) {
 935     resolved_method = resolve_method(link_info, /*require_methodref*/false, CHECK_NULL);
 936   } else {
 937     resolved_method = resolve_interface_method(link_info, /*nostatics*/false, CHECK_NULL);
 938   }
 939   assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier");
 940 
 941   // check if static
 942   if (!resolved_method->is_static()) {
 943     ResourceMark rm(THREAD);
 944     char buf[200];
 945     jio_snprintf(buf, sizeof(buf), "Expected static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
 946                                                       resolved_method->name(),
 947                                                       resolved_method->signature()));
 948     THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
 949   }
 950   return resolved_method;
 951 }
 952 
 953 
 954 void LinkResolver::resolve_special_call(CallInfo& result,
 955                                         const LinkInfo& link_info,
 956                                         TRAPS) {
 957   methodHandle resolved_method = linktime_resolve_special_method(link_info, CHECK);
 958   runtime_resolve_special_method(result, resolved_method,
 959                                  link_info.resolved_klass(),
 960                                  link_info.current_klass(),
 961                                  link_info.check_access(), CHECK);
 962 }
 963 
 964 // throws linktime exceptions
 965 methodHandle LinkResolver::linktime_resolve_special_method(const LinkInfo& link_info,
 966                                                            TRAPS) {
 967 
 968   // Invokespecial is called for multiple special reasons:
 969   // <init>
 970   // local private method invocation, for classes and interfaces
 971   // superclass.method, which can also resolve to a default method
 972   // and the selected method is recalculated relative to the direct superclass
 973   // superinterface.method, which explicitly does not check shadowing
 974   KlassHandle resolved_klass = link_info.resolved_klass();
 975   methodHandle resolved_method;
 976 
 977   if (!resolved_klass->is_interface()) {
 978     resolved_method = resolve_method(link_info, /*require_methodref*/false, CHECK_NULL);
 979   } else {
 980     resolved_method = resolve_interface_method(link_info, /*nostatics*/true, CHECK_NULL);
 981   }
 982 
 983   // check if method name is <init>, that it is found in same klass as static type
 984   if (resolved_method->name() == vmSymbols::object_initializer_name() &&
 985       resolved_method->method_holder() != resolved_klass()) {
 986     ResourceMark rm(THREAD);
 987     Exceptions::fthrow(
 988       THREAD_AND_LOCATION,
 989       vmSymbols::java_lang_NoSuchMethodError(),
 990       "%s: method %s%s not found",
 991       resolved_klass->external_name(),
 992       resolved_method->name()->as_C_string(),
 993       resolved_method->signature()->as_C_string()
 994     );
 995     return NULL;
 996   }
 997 
 998   // check if invokespecial's interface method reference is in an indirect superinterface
 999   KlassHandle current_klass = link_info.current_klass();
1000   if (!current_klass.is_null() && resolved_klass->is_interface()) {
1001     Klass *klass_to_check = !InstanceKlass::cast(current_klass())->is_anonymous() ?
1002                                   current_klass() :
1003                                   InstanceKlass::cast(current_klass())->host_klass();
1004     // Disable verification for the dynamically-generated reflection bytecodes.
1005     bool is_reflect = klass_to_check->is_subclass_of(
1006                         SystemDictionary::reflect_MagicAccessorImpl_klass());
1007 
1008     if (!is_reflect &&
1009         !InstanceKlass::cast(klass_to_check)->is_same_or_direct_interface(resolved_klass())) {
1010       ResourceMark rm(THREAD);
1011       char buf[200];
1012       jio_snprintf(buf, sizeof(buf),
1013                    "Interface method reference: %s, is in an indirect superinterface of %s",
1014                    Method::name_and_sig_as_C_string(resolved_klass(),
1015                                                          resolved_method->name(),
1016                                                          resolved_method->signature()),
1017                    current_klass->external_name());
1018       THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1019     }
1020   }
1021 
1022   // check if not static
1023   if (resolved_method->is_static()) {
1024     ResourceMark rm(THREAD);
1025     char buf[200];
1026     jio_snprintf(buf, sizeof(buf),
1027                  "Expecting non-static method %s",
1028                  Method::name_and_sig_as_C_string(resolved_klass(),
1029                                                   resolved_method->name(),
1030                                                   resolved_method->signature()));
1031     THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1032   }
1033 
1034   if (TraceItables && Verbose) {
1035     trace_method_resolution("invokespecial resolved method: caller-class:",
1036                             current_klass, resolved_klass, resolved_method);
1037     tty->cr();
1038   }
1039 
1040   return resolved_method;
1041 }
1042 
1043 // throws runtime exceptions
1044 void LinkResolver::runtime_resolve_special_method(CallInfo& result,
1045                                                   const methodHandle& resolved_method,
1046                                                   KlassHandle resolved_klass,
1047                                                   KlassHandle current_klass,
1048                                                   bool check_access, TRAPS) {
1049 
1050   // resolved method is selected method unless we have an old-style lookup
1051   // for a superclass method
1052   // Invokespecial for a superinterface, resolved method is selected method,
1053   // no checks for shadowing
1054   methodHandle sel_method(THREAD, resolved_method());
1055 
1056   // check if this is an old-style super call and do a new lookup if so
1057   { KlassHandle method_klass  = KlassHandle(THREAD,
1058                                             resolved_method->method_holder());
1059 
1060     if (check_access &&
1061         // a) check if ACC_SUPER flag is set for the current class
1062         (current_klass->is_super() || !AllowNonVirtualCalls) &&
1063         // b) check if the class of the resolved_klass is a superclass
1064         // (not supertype in order to exclude interface classes) of the current class.
1065         // This check is not performed for super.invoke for interface methods
1066         // in super interfaces.
1067         current_klass->is_subclass_of(resolved_klass()) &&
1068         current_klass() != resolved_klass() &&
1069         // c) check if the method is not <init>
1070         resolved_method->name() != vmSymbols::object_initializer_name()) {
1071       // Lookup super method
1072       KlassHandle super_klass(THREAD, current_klass->super());
1073       sel_method = lookup_instance_method_in_klasses(super_klass,
1074                            resolved_method->name(),
1075                            resolved_method->signature(), CHECK);
1076       // check if found
1077       if (sel_method.is_null()) {
1078         ResourceMark rm(THREAD);
1079         THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1080                   Method::name_and_sig_as_C_string(resolved_klass(),
1081                                             resolved_method->name(),
1082                                             resolved_method->signature()));
1083       }
1084     }
1085   }
1086 
1087   // check if not static
1088   if (sel_method->is_static()) {
1089     ResourceMark rm(THREAD);
1090     char buf[200];
1091     jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
1092                                                                                                              resolved_method->name(),
1093                                                                                                              resolved_method->signature()));
1094     THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1095   }
1096 
1097   // check if abstract
1098   if (sel_method->is_abstract()) {
1099     ResourceMark rm(THREAD);
1100     THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1101               Method::name_and_sig_as_C_string(resolved_klass(),
1102                                                sel_method->name(),
1103                                                sel_method->signature()));
1104   }
1105 
1106   if (TraceItables && Verbose) {
1107     trace_method_resolution("invokespecial selected method: resolved-class:",
1108                             resolved_klass, resolved_klass, sel_method);
1109     tty->cr();
1110   }
1111 
1112   // setup result
1113   result.set_static(resolved_klass, sel_method, CHECK);
1114 }
1115 
1116 void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, KlassHandle receiver_klass,
1117                                         const LinkInfo& link_info,
1118                                         bool check_null_and_abstract, TRAPS) {
1119   methodHandle resolved_method = linktime_resolve_virtual_method(link_info, CHECK);
1120   runtime_resolve_virtual_method(result, resolved_method,
1121                                  link_info.resolved_klass(),
1122                                  recv, receiver_klass,
1123                                  check_null_and_abstract, CHECK);
1124 }
1125 
1126 // throws linktime exceptions
1127 methodHandle LinkResolver::linktime_resolve_virtual_method(const LinkInfo& link_info,
1128                                                            TRAPS) {
1129   // normal method resolution
1130   methodHandle resolved_method = resolve_method(link_info, /*require_methodref*/true, CHECK_NULL);
1131 
1132   assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1133   assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1134 
1135   // check if private interface method
1136   KlassHandle resolved_klass = link_info.resolved_klass();
1137   KlassHandle current_klass = link_info.current_klass();
1138 
1139   if (resolved_klass->is_interface() && resolved_method->is_private()) {
1140     ResourceMark rm(THREAD);
1141     char buf[200];
1142     jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokevirtual: method %s, caller-class:%s",
1143                  Method::name_and_sig_as_C_string(resolved_klass(),
1144                                                   resolved_method->name(),
1145                                                   resolved_method->signature()),
1146                    (current_klass.is_null() ? "<NULL>" : current_klass->internal_name()));
1147     THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1148   }
1149 
1150   // check if not static
1151   if (resolved_method->is_static()) {
1152     ResourceMark rm(THREAD);
1153     char buf[200];
1154     jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
1155                                                                                                              resolved_method->name(),
1156                                                                                                              resolved_method->signature()));
1157     THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1158   }
1159 
1160   if (PrintVtables && Verbose) {
1161     trace_method_resolution("invokevirtual resolved method: caller-class:",
1162                             current_klass, resolved_klass, resolved_method);
1163     tty->cr();
1164   }
1165 
1166   return resolved_method;
1167 }
1168 
1169 // throws runtime exceptions
1170 void LinkResolver::runtime_resolve_virtual_method(CallInfo& result,
1171                                                   const methodHandle& resolved_method,
1172                                                   KlassHandle resolved_klass,
1173                                                   Handle recv,
1174                                                   KlassHandle recv_klass,
1175                                                   bool check_null_and_abstract,
1176                                                   TRAPS) {
1177 
1178   // setup default return values
1179   int vtable_index = Method::invalid_vtable_index;
1180   methodHandle selected_method;
1181 
1182   assert(recv.is_null() || recv->is_oop(), "receiver is not an oop");
1183 
1184   // runtime method resolution
1185   if (check_null_and_abstract && recv.is_null()) { // check if receiver exists
1186     THROW(vmSymbols::java_lang_NullPointerException());
1187   }
1188 
1189   // Virtual methods cannot be resolved before its klass has been linked, for otherwise the Method*'s
1190   // has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since
1191   // a missing receiver might result in a bogus lookup.
1192   assert(resolved_method->method_holder()->is_linked(), "must be linked");
1193 
1194   // do lookup based on receiver klass using the vtable index
1195   if (resolved_method->method_holder()->is_interface()) { // default or miranda method
1196     vtable_index = vtable_index_of_interface_method(resolved_klass,
1197                            resolved_method);
1198     assert(vtable_index >= 0 , "we should have valid vtable index at this point");
1199 
1200     InstanceKlass* inst = InstanceKlass::cast(recv_klass());
1201     selected_method = methodHandle(THREAD, inst->method_at_vtable(vtable_index));
1202   } else {
1203     // at this point we are sure that resolved_method is virtual and not
1204     // a default or miranda method; therefore, it must have a valid vtable index.
1205     assert(!resolved_method->has_itable_index(), "");
1206     vtable_index = resolved_method->vtable_index();
1207     // We could get a negative vtable_index for final methods,
1208     // because as an optimization they are they are never put in the vtable,
1209     // unless they override an existing method.
1210     // If we do get a negative, it means the resolved method is the the selected
1211     // method, and it can never be changed by an override.
1212     if (vtable_index == Method::nonvirtual_vtable_index) {
1213       assert(resolved_method->can_be_statically_bound(), "cannot override this method");
1214       selected_method = resolved_method;
1215     } else {
1216       // recv_klass might be an arrayKlassOop but all vtables start at
1217       // the same place. The cast is to avoid virtual call and assertion.
1218       InstanceKlass* inst = (InstanceKlass*)recv_klass();
1219       selected_method = methodHandle(THREAD, inst->method_at_vtable(vtable_index));
1220     }
1221   }
1222 
1223   // check if method exists
1224   if (selected_method.is_null()) {
1225     ResourceMark rm(THREAD);
1226     THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1227               Method::name_and_sig_as_C_string(resolved_klass(),
1228                                                       resolved_method->name(),
1229                                                       resolved_method->signature()));
1230   }
1231 
1232   // check if abstract
1233   if (check_null_and_abstract && selected_method->is_abstract()) {
1234     ResourceMark rm(THREAD);
1235     THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1236               Method::name_and_sig_as_C_string(resolved_klass(),
1237                                                       selected_method->name(),
1238                                                       selected_method->signature()));
1239   }
1240 
1241   if (PrintVtables && Verbose) {
1242     trace_method_resolution("invokevirtual selected method: receiver-class:",
1243                             recv_klass, resolved_klass, selected_method);
1244     tty->print_cr("vtable_index:%d", vtable_index);
1245   }
1246   // setup result
1247   result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK);
1248 }
1249 
1250 void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, KlassHandle recv_klass,
1251                                           const LinkInfo& link_info,
1252                                           bool check_null_and_abstract, TRAPS) {
1253   // throws linktime exceptions
1254   methodHandle resolved_method = linktime_resolve_interface_method(link_info, CHECK);
1255   runtime_resolve_interface_method(result, resolved_method,link_info.resolved_klass(),
1256                                    recv, recv_klass, check_null_and_abstract, CHECK);
1257 }
1258 
1259 methodHandle LinkResolver::linktime_resolve_interface_method(const LinkInfo& link_info,
1260                                                              TRAPS) {
1261   // normal interface method resolution
1262   methodHandle resolved_method = resolve_interface_method(link_info, true, CHECK_NULL);
1263   assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1264   assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1265 
1266   return resolved_method;
1267 }
1268 
1269 // throws runtime exceptions
1270 void LinkResolver::runtime_resolve_interface_method(CallInfo& result,
1271                                                     const methodHandle& resolved_method,
1272                                                     KlassHandle resolved_klass,
1273                                                     Handle recv,
1274                                                     KlassHandle recv_klass,
1275                                                     bool check_null_and_abstract, TRAPS) {
1276   // check if receiver exists
1277   if (check_null_and_abstract && recv.is_null()) {
1278     THROW(vmSymbols::java_lang_NullPointerException());
1279   }
1280 
1281   // check if private interface method
1282   if (resolved_klass->is_interface() && resolved_method->is_private()) {
1283     ResourceMark rm(THREAD);
1284     char buf[200];
1285     jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokeinterface: method %s",
1286                  Method::name_and_sig_as_C_string(resolved_klass(),
1287                                                   resolved_method->name(),
1288                                                   resolved_method->signature()));
1289     THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1290   }
1291 
1292   // check if receiver klass implements the resolved interface
1293   if (!recv_klass->is_subtype_of(resolved_klass())) {
1294     ResourceMark rm(THREAD);
1295     char buf[200];
1296     jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s",
1297                  recv_klass()->external_name(),
1298                  resolved_klass()->external_name());
1299     THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1300   }
1301 
1302   // do lookup based on receiver klass
1303   // This search must match the linktime preparation search for itable initialization
1304   // to correctly enforce loader constraints for interface method inheritance
1305   methodHandle sel_method = lookup_instance_method_in_klasses(recv_klass,
1306                                                   resolved_method->name(),
1307                                                   resolved_method->signature(), CHECK);
1308   if (sel_method.is_null() && !check_null_and_abstract) {
1309     // In theory this is a harmless placeholder value, but
1310     // in practice leaving in null affects the nsk default method tests.
1311     // This needs further study.
1312     sel_method = resolved_method;
1313   }
1314   // check if method exists
1315   if (sel_method.is_null()) {
1316     ResourceMark rm(THREAD);
1317     THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1318                    Method::name_and_sig_as_C_string(recv_klass(),
1319                                                     resolved_method->name(),
1320                                                     resolved_method->signature()));
1321   }
1322   // check access
1323   // Throw Illegal Access Error if sel_method is not public.
1324   if (!sel_method->is_public()) {
1325     ResourceMark rm(THREAD);
1326     THROW_MSG(vmSymbols::java_lang_IllegalAccessError(),
1327               Method::name_and_sig_as_C_string(recv_klass(),
1328                                                sel_method->name(),
1329                                                sel_method->signature()));
1330   }
1331   // check if abstract
1332   if (check_null_and_abstract && sel_method->is_abstract()) {
1333     ResourceMark rm(THREAD);
1334     THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1335               Method::name_and_sig_as_C_string(recv_klass(),
1336                                                       sel_method->name(),
1337                                                       sel_method->signature()));
1338   }
1339 
1340   if (TraceItables && Verbose) {
1341     trace_method_resolution("invokeinterface selected method: receiver-class",
1342                             recv_klass, resolved_klass, sel_method);
1343     tty->cr();
1344   }
1345   // setup result
1346   if (!resolved_method->has_itable_index()) {
1347     int vtable_index = resolved_method->vtable_index();
1348     assert(vtable_index == sel_method->vtable_index(), "sanity check");
1349     result.set_virtual(resolved_klass, recv_klass, resolved_method, sel_method, vtable_index, CHECK);
1350   } else {
1351     int itable_index = resolved_method()->itable_index();
1352     result.set_interface(resolved_klass, recv_klass, resolved_method, sel_method, itable_index, CHECK);
1353   }
1354 }
1355 
1356 
1357 methodHandle LinkResolver::linktime_resolve_interface_method_or_null(
1358                                                  const LinkInfo& link_info) {
1359   EXCEPTION_MARK;
1360   methodHandle method_result = linktime_resolve_interface_method(link_info, THREAD);
1361   if (HAS_PENDING_EXCEPTION) {
1362     CLEAR_PENDING_EXCEPTION;
1363     return methodHandle();
1364   } else {
1365     return method_result;
1366   }
1367 }
1368 
1369 methodHandle LinkResolver::linktime_resolve_virtual_method_or_null(
1370                                                  const LinkInfo& link_info) {
1371   EXCEPTION_MARK;
1372   methodHandle method_result = linktime_resolve_virtual_method(link_info, THREAD);
1373   if (HAS_PENDING_EXCEPTION) {
1374     CLEAR_PENDING_EXCEPTION;
1375     return methodHandle();
1376   } else {
1377     return method_result;
1378   }
1379 }
1380 
1381 methodHandle LinkResolver::resolve_virtual_call_or_null(
1382                                                  KlassHandle receiver_klass,
1383                                                  const LinkInfo& link_info) {
1384   EXCEPTION_MARK;
1385   CallInfo info;
1386   resolve_virtual_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1387   if (HAS_PENDING_EXCEPTION) {
1388     CLEAR_PENDING_EXCEPTION;
1389     return methodHandle();
1390   }
1391   return info.selected_method();
1392 }
1393 
1394 methodHandle LinkResolver::resolve_interface_call_or_null(
1395                                                  KlassHandle receiver_klass,
1396                                                  const LinkInfo& link_info) {
1397   EXCEPTION_MARK;
1398   CallInfo info;
1399   resolve_interface_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1400   if (HAS_PENDING_EXCEPTION) {
1401     CLEAR_PENDING_EXCEPTION;
1402     return methodHandle();
1403   }
1404   return info.selected_method();
1405 }
1406 
1407 int LinkResolver::resolve_virtual_vtable_index(KlassHandle receiver_klass,
1408                                                const LinkInfo& link_info) {
1409   EXCEPTION_MARK;
1410   CallInfo info;
1411   resolve_virtual_call(info, Handle(), receiver_klass, link_info,
1412                        /*check_null_or_abstract*/false, THREAD);
1413   if (HAS_PENDING_EXCEPTION) {
1414     CLEAR_PENDING_EXCEPTION;
1415     return Method::invalid_vtable_index;
1416   }
1417   return info.vtable_index();
1418 }
1419 
1420 methodHandle LinkResolver::resolve_static_call_or_null(const LinkInfo& link_info) {
1421   EXCEPTION_MARK;
1422   CallInfo info;
1423   resolve_static_call(info, link_info, /*initialize_class*/false, THREAD);
1424   if (HAS_PENDING_EXCEPTION) {
1425     CLEAR_PENDING_EXCEPTION;
1426     return methodHandle();
1427   }
1428   return info.selected_method();
1429 }
1430 
1431 methodHandle LinkResolver::resolve_special_call_or_null(const LinkInfo& link_info) {
1432   EXCEPTION_MARK;
1433   CallInfo info;
1434   resolve_special_call(info, link_info, THREAD);
1435   if (HAS_PENDING_EXCEPTION) {
1436     CLEAR_PENDING_EXCEPTION;
1437     return methodHandle();
1438   }
1439   return info.selected_method();
1440 }
1441 
1442 
1443 
1444 //------------------------------------------------------------------------------------------------------------------------
1445 // ConstantPool entries
1446 
1447 void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) {
1448   switch (byte) {
1449     case Bytecodes::_invokestatic   : resolve_invokestatic   (result,       pool, index, CHECK); break;
1450     case Bytecodes::_invokespecial  : resolve_invokespecial  (result,       pool, index, CHECK); break;
1451     case Bytecodes::_invokevirtual  : resolve_invokevirtual  (result, recv, pool, index, CHECK); break;
1452     case Bytecodes::_invokehandle   : resolve_invokehandle   (result,       pool, index, CHECK); break;
1453     case Bytecodes::_invokedynamic  : resolve_invokedynamic  (result,       pool, index, CHECK); break;
1454     case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break;
1455   }
1456   return;
1457 }
1458 
1459 void LinkResolver::resolve_invokestatic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1460   LinkInfo link_info(pool, index, CHECK);
1461   resolve_static_call(result, link_info, /*initialize_class*/true, CHECK);
1462 }
1463 
1464 
1465 void LinkResolver::resolve_invokespecial(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1466   LinkInfo link_info(pool, index, CHECK);
1467   resolve_special_call(result, link_info, CHECK);
1468 }
1469 
1470 
1471 void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv,
1472                                           const constantPoolHandle& pool, int index,
1473                                           TRAPS) {
1474 
1475   LinkInfo link_info(pool, index, CHECK);
1476   KlassHandle recvrKlass (THREAD, recv.is_null() ? (Klass*)NULL : recv->klass());
1477   resolve_virtual_call(result, recv, recvrKlass, link_info, /*check_null_or_abstract*/true, CHECK);
1478 }
1479 
1480 
1481 void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, TRAPS) {
1482   LinkInfo link_info(pool, index, CHECK);
1483   KlassHandle recvrKlass (THREAD, recv.is_null() ? (Klass*)NULL : recv->klass());
1484   resolve_interface_call(result, recv, recvrKlass, link_info, true, CHECK);
1485 }
1486 
1487 
1488 void LinkResolver::resolve_invokehandle(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1489   // This guy is reached from InterpreterRuntime::resolve_invokehandle.
1490   LinkInfo link_info(pool, index, CHECK);
1491   if (TraceMethodHandles) {
1492     ResourceMark rm(THREAD);
1493     tty->print_cr("resolve_invokehandle %s %s", link_info.name()->as_C_string(),
1494                   link_info.signature()->as_C_string());
1495   }
1496   resolve_handle_call(result, link_info, CHECK);
1497 }
1498 
1499 void LinkResolver::resolve_handle_call(CallInfo& result,
1500                                        const LinkInfo& link_info,
1501                                        TRAPS) {
1502   // JSR 292:  this must be an implicitly generated method MethodHandle.invokeExact(*...) or similar
1503   assert(link_info.resolved_klass()() == SystemDictionary::MethodHandle_klass(), "");
1504   assert(MethodHandles::is_signature_polymorphic_name(link_info.name()), "");
1505   Handle       resolved_appendix;
1506   Handle       resolved_method_type;
1507   methodHandle resolved_method = lookup_polymorphic_method(link_info,
1508                                        &resolved_appendix, &resolved_method_type, CHECK);
1509   result.set_handle(resolved_method, resolved_appendix, resolved_method_type, CHECK);
1510 }
1511 
1512 static void wrap_invokedynamic_exception(TRAPS) {
1513   if (HAS_PENDING_EXCEPTION) {
1514     if (TraceMethodHandles) {
1515       tty->print_cr("invokedynamic throws BSME for " INTPTR_FORMAT, p2i((void *)PENDING_EXCEPTION));
1516       PENDING_EXCEPTION->print();
1517     }
1518     if (PENDING_EXCEPTION->is_a(SystemDictionary::BootstrapMethodError_klass())) {
1519       // throw these guys, since they are already wrapped
1520       return;
1521     }
1522     if (!PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1523       // intercept only LinkageErrors which might have failed to wrap
1524       return;
1525     }
1526     // See the "Linking Exceptions" section for the invokedynamic instruction in the JVMS.
1527     Handle nested_exception(THREAD, PENDING_EXCEPTION);
1528     CLEAR_PENDING_EXCEPTION;
1529     THROW_CAUSE(vmSymbols::java_lang_BootstrapMethodError(), nested_exception)
1530   }
1531 }
1532 
1533 void LinkResolver::resolve_invokedynamic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1534   Symbol* method_name       = pool->name_ref_at(index);
1535   Symbol* method_signature  = pool->signature_ref_at(index);
1536   KlassHandle current_klass = KlassHandle(THREAD, pool->pool_holder());
1537 
1538   // Resolve the bootstrap specifier (BSM + optional arguments).
1539   Handle bootstrap_specifier;
1540   // Check if CallSite has been bound already:
1541   ConstantPoolCacheEntry* cpce = pool->invokedynamic_cp_cache_entry_at(index);
1542   if (cpce->is_f1_null()) {
1543     int pool_index = cpce->constant_pool_index();
1544     oop bsm_info = pool->resolve_bootstrap_specifier_at(pool_index, THREAD);
1545     wrap_invokedynamic_exception(CHECK);
1546     assert(bsm_info != NULL, "");
1547     // FIXME: Cache this once per BootstrapMethods entry, not once per CONSTANT_InvokeDynamic.
1548     bootstrap_specifier = Handle(THREAD, bsm_info);
1549   }
1550   if (!cpce->is_f1_null()) {
1551     methodHandle method(     THREAD, cpce->f1_as_method());
1552     Handle       appendix(   THREAD, cpce->appendix_if_resolved(pool));
1553     Handle       method_type(THREAD, cpce->method_type_if_resolved(pool));
1554     result.set_handle(method, appendix, method_type, THREAD);
1555     wrap_invokedynamic_exception(CHECK);
1556     return;
1557   }
1558 
1559   if (TraceMethodHandles) {
1560       ResourceMark rm(THREAD);
1561       tty->print_cr("resolve_invokedynamic #%d %s %s",
1562                   ConstantPool::decode_invokedynamic_index(index),
1563                   method_name->as_C_string(), method_signature->as_C_string());
1564     tty->print("  BSM info: "); bootstrap_specifier->print();
1565   }
1566 
1567   resolve_dynamic_call(result, bootstrap_specifier, method_name, method_signature, current_klass, CHECK);
1568 }
1569 
1570 void LinkResolver::resolve_dynamic_call(CallInfo& result,
1571                                         Handle bootstrap_specifier,
1572                                         Symbol* method_name, Symbol* method_signature,
1573                                         KlassHandle current_klass,
1574                                         TRAPS) {
1575   // JSR 292:  this must resolve to an implicitly generated method MH.linkToCallSite(*...)
1576   // The appendix argument is likely to be a freshly-created CallSite.
1577   Handle       resolved_appendix;
1578   Handle       resolved_method_type;
1579   methodHandle resolved_method =
1580     SystemDictionary::find_dynamic_call_site_invoker(current_klass,
1581                                                      bootstrap_specifier,
1582                                                      method_name, method_signature,
1583                                                      &resolved_appendix,
1584                                                      &resolved_method_type,
1585                                                      THREAD);
1586   wrap_invokedynamic_exception(CHECK);
1587   result.set_handle(resolved_method, resolved_appendix, resolved_method_type, THREAD);
1588   wrap_invokedynamic_exception(CHECK);
1589 }
1590 
1591 #ifndef PRODUCT
1592 void LinkResolver::trace_method_resolution(const char* prefix,
1593                                            KlassHandle klass,
1594                                            KlassHandle resolved_klass,
1595                                            const methodHandle& method) {
1596   ResourceMark rm;
1597   tty->print("%s%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ",
1598              prefix,
1599              (klass.is_null() ? "<NULL>" : klass->internal_name()),
1600              (resolved_klass.is_null() ? "<NULL>" : resolved_klass->internal_name()),
1601              Method::name_and_sig_as_C_string(resolved_klass(),
1602                                               method->name(),
1603                                               method->signature()),
1604              method->method_holder()->internal_name()
1605              );
1606   method->access_flags().print_on(tty);
1607   if (method->is_default_method()) {
1608     tty->print("default ");
1609   }
1610   if (method->is_overpass()) {
1611     tty->print("overpass ");
1612   }
1613 }
1614 #endif // PRODUCT