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       err_msg("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       err_msg("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, err_msg("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(err_msg_res("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(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->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
 346 methodHandle 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 
 371 int 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 
 397 methodHandle 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 
 408 methodHandle 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->can_call_java()
 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                err_msg("%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 
 515 void 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 
 561 methodHandle 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
 605 void 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 
 636 void 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 
 667 methodHandle 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 
 728 methodHandle 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 
 796 void 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 
 819 void 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 
 824 void 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 
 904 void 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
 928 methodHandle 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 
 952 void 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
 963 methodHandle 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
1042 void 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 
1114 void 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
1125 methodHandle 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
1168 void 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 
1248 void 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 
1257 methodHandle 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
1268 void 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 
1355 methodHandle 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 
1367 methodHandle 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 
1379 methodHandle 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 
1392 methodHandle 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 
1405 int 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 
1418 methodHandle 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 
1429 methodHandle 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 
1445 void 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 
1457 void 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 
1463 void 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 
1469 void 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 
1479 void 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 
1486 void 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 
1497 void 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 
1510 static 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 
1531 void 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 
1568 void 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
1590 void 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