1 /*
   2  * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "jvm.h"
  27 #include "classfile/defaultMethods.hpp"
  28 #include "classfile/javaClasses.hpp"
  29 #include "classfile/resolutionErrors.hpp"
  30 #include "classfile/symbolTable.hpp"
  31 #include "classfile/systemDictionary.hpp"
  32 #include "classfile/vmSymbols.hpp"
  33 #include "compiler/compileBroker.hpp"
  34 #include "gc/shared/collectedHeap.inline.hpp"
  35 #include "interpreter/bytecode.hpp"
  36 #include "interpreter/interpreterRuntime.hpp"
  37 #include "interpreter/linkResolver.hpp"
  38 #include "logging/log.hpp"
  39 #include "logging/logStream.hpp"
  40 #include "memory/resourceArea.hpp"
  41 #include "memory/universe.hpp"
  42 #include "oops/cpCache.inline.hpp"
  43 #include "oops/instanceKlass.hpp"
  44 #include "oops/method.hpp"
  45 #include "oops/objArrayKlass.hpp"
  46 #include "oops/objArrayOop.hpp"
  47 #include "oops/oop.inline.hpp"
  48 #include "prims/methodHandles.hpp"
  49 #include "prims/nativeLookup.hpp"
  50 #include "runtime/compilationPolicy.hpp"
  51 #include "runtime/fieldDescriptor.hpp"
  52 #include "runtime/frame.inline.hpp"
  53 #include "runtime/handles.inline.hpp"
  54 #include "runtime/reflection.hpp"
  55 #include "runtime/safepointVerifiers.hpp"
  56 #include "runtime/signature.hpp"
  57 #include "runtime/thread.inline.hpp"
  58 #include "runtime/vmThread.hpp"
  59 
  60 //------------------------------------------------------------------------------------------------------------------------
  61 // Implementation of CallInfo
  62 
  63 
  64 void CallInfo::set_static(Klass* resolved_klass, const methodHandle& resolved_method, TRAPS) {
  65   int vtable_index = Method::nonvirtual_vtable_index;
  66   set_common(resolved_klass, resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK);
  67 }
  68 
  69 
  70 void CallInfo::set_interface(Klass* resolved_klass,
  71                              Klass* selected_klass,
  72                              const methodHandle& resolved_method,
  73                              const methodHandle& selected_method,
  74                              int itable_index, TRAPS) {
  75   // This is only called for interface methods. If the resolved_method
  76   // comes from java/lang/Object, it can be the subject of a virtual call, so
  77   // we should pick the vtable index from the resolved method.
  78   // In that case, the caller must call set_virtual instead of set_interface.
  79   assert(resolved_method->method_holder()->is_interface(), "");
  80   assert(itable_index == resolved_method()->itable_index(), "");
  81   set_common(resolved_klass, selected_klass, resolved_method, selected_method, CallInfo::itable_call, itable_index, CHECK);
  82 }
  83 
  84 void CallInfo::set_virtual(Klass* resolved_klass,
  85                            Klass* selected_klass,
  86                            const methodHandle& resolved_method,
  87                            const methodHandle& selected_method,
  88                            int vtable_index, TRAPS) {
  89   assert(vtable_index >= 0 || vtable_index == Method::nonvirtual_vtable_index, "valid index");
  90   assert(vtable_index < 0 || !resolved_method->has_vtable_index() || vtable_index == resolved_method->vtable_index(), "");
  91   CallKind kind = (vtable_index >= 0 && !resolved_method->can_be_statically_bound() ? CallInfo::vtable_call : CallInfo::direct_call);
  92   set_common(resolved_klass, selected_klass, resolved_method, selected_method, kind, vtable_index, CHECK);
  93   assert(!resolved_method->is_compiled_lambda_form(), "these must be handled via an invokehandle call");
  94 }
  95 
  96 void CallInfo::set_handle(const methodHandle& resolved_method,
  97                           Handle resolved_appendix,
  98                           Handle resolved_method_type, TRAPS) {
  99   set_handle(SystemDictionary::MethodHandle_klass(), resolved_method, resolved_appendix, resolved_method_type, CHECK);
 100 }
 101 
 102 void CallInfo::set_handle(Klass* resolved_klass,
 103                           const methodHandle& resolved_method,
 104                           Handle resolved_appendix,
 105                           Handle resolved_method_type, TRAPS) {
 106   if (resolved_method.is_null()) {
 107     THROW_MSG(vmSymbols::java_lang_InternalError(), "resolved method is null");
 108   }
 109   assert(resolved_method->intrinsic_id() == vmIntrinsics::_invokeBasic ||
 110          resolved_method->is_compiled_lambda_form(),
 111          "linkMethod must return one of these");
 112   int vtable_index = Method::nonvirtual_vtable_index;
 113   assert(!resolved_method->has_vtable_index(), "");
 114   set_common(resolved_klass, resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK);
 115   _resolved_appendix    = resolved_appendix;
 116   _resolved_method_type = resolved_method_type;
 117 }
 118 
 119 void CallInfo::set_common(Klass* resolved_klass,
 120                           Klass* selected_klass,
 121                           const methodHandle& resolved_method,
 122                           const methodHandle& selected_method,
 123                           CallKind kind,
 124                           int index,
 125                           TRAPS) {
 126   assert(resolved_method->signature() == selected_method->signature(), "signatures must correspond");
 127   _resolved_klass  = resolved_klass;
 128   _selected_klass  = selected_klass;
 129   _resolved_method = resolved_method;
 130   _selected_method = selected_method;
 131   _call_kind       = kind;
 132   _call_index      = index;
 133   _resolved_appendix = Handle();
 134   DEBUG_ONLY(verify());  // verify before making side effects
 135 
 136   CompilationPolicy::compile_if_required(selected_method, THREAD);
 137 }
 138 
 139 // utility query for unreflecting a method
 140 CallInfo::CallInfo(Method* resolved_method, Klass* resolved_klass, TRAPS) {
 141   Klass* resolved_method_holder = resolved_method->method_holder();
 142   if (resolved_klass == NULL) { // 2nd argument defaults to holder of 1st
 143     resolved_klass = resolved_method_holder;
 144   }
 145   _resolved_klass  = resolved_klass;
 146   _selected_klass  = resolved_klass;
 147   _resolved_method = resolved_method;
 148   _selected_method = resolved_method;
 149   // classify:
 150   CallKind kind = CallInfo::unknown_kind;
 151   int index = resolved_method->vtable_index();
 152   if (resolved_method->can_be_statically_bound()) {
 153     kind = CallInfo::direct_call;
 154   } else if (!resolved_method_holder->is_interface()) {
 155     // Could be an Object method inherited into an interface, but still a vtable call.
 156     kind = CallInfo::vtable_call;
 157   } else if (!resolved_klass->is_interface()) {
 158     // A default or miranda method.  Compute the vtable index.
 159     index = LinkResolver::vtable_index_of_interface_method(resolved_klass,
 160                            resolved_method);
 161     assert(index >= 0 , "we should have valid vtable index at this point");
 162 
 163     kind = CallInfo::vtable_call;
 164   } else if (resolved_method->has_vtable_index()) {
 165     // Can occur if an interface redeclares a method of Object.
 166 
 167 #ifdef ASSERT
 168     // Ensure that this is really the case.
 169     Klass* object_klass = SystemDictionary::Object_klass();
 170     Method * object_resolved_method = object_klass->vtable().method_at(index);
 171     assert(object_resolved_method->name() == resolved_method->name(),
 172       "Object and interface method names should match at vtable index %d, %s != %s",
 173       index, object_resolved_method->name()->as_C_string(), resolved_method->name()->as_C_string());
 174     assert(object_resolved_method->signature() == resolved_method->signature(),
 175       "Object and interface method signatures should match at vtable index %d, %s != %s",
 176       index, object_resolved_method->signature()->as_C_string(), resolved_method->signature()->as_C_string());
 177 #endif // ASSERT
 178 
 179     kind = CallInfo::vtable_call;
 180   } else {
 181     // A regular interface call.
 182     kind = CallInfo::itable_call;
 183     index = resolved_method->itable_index();
 184   }
 185   assert(index == Method::nonvirtual_vtable_index || index >= 0, "bad index %d", index);
 186   _call_kind  = kind;
 187   _call_index = index;
 188   _resolved_appendix = Handle();
 189   // Find or create a ResolvedMethod instance for this Method*
 190   set_resolved_method_name(CHECK);
 191 
 192   DEBUG_ONLY(verify());
 193 }
 194 
 195 void CallInfo::set_resolved_method_name(TRAPS) {
 196   Method* m = _resolved_method();
 197   assert(m != NULL, "Should already have a Method*");
 198   oop rmethod_name = java_lang_invoke_ResolvedMethodName::find_resolved_method(m, CHECK);
 199   _resolved_method_name = Handle(THREAD, rmethod_name);
 200 }
 201 
 202 #ifdef ASSERT
 203 void CallInfo::verify() {
 204   switch (call_kind()) {  // the meaning and allowed value of index depends on kind
 205   case CallInfo::direct_call:
 206     if (_call_index == Method::nonvirtual_vtable_index)  break;
 207     // else fall through to check vtable index:
 208   case CallInfo::vtable_call:
 209     assert(resolved_klass()->verify_vtable_index(_call_index), "");
 210     break;
 211   case CallInfo::itable_call:
 212     assert(resolved_method()->method_holder()->verify_itable_index(_call_index), "");
 213     break;
 214   case CallInfo::unknown_kind:
 215     assert(call_kind() != CallInfo::unknown_kind, "CallInfo must be set");
 216     break;
 217   default:
 218     fatal("Unexpected call kind %d", call_kind());
 219   }
 220 }
 221 #endif //ASSERT
 222 
 223 #ifndef PRODUCT
 224 void CallInfo::print() {
 225   ResourceMark rm;
 226   const char* kindstr;
 227   switch (_call_kind) {
 228   case direct_call: kindstr = "direct";  break;
 229   case vtable_call: kindstr = "vtable";  break;
 230   case itable_call: kindstr = "itable";  break;
 231   default         : kindstr = "unknown"; break;
 232   }
 233   tty->print_cr("Call %s@%d %s", kindstr, _call_index,
 234                 _resolved_method.is_null() ? "(none)" : _resolved_method->name_and_sig_as_C_string());
 235 }
 236 #endif
 237 
 238 //------------------------------------------------------------------------------------------------------------------------
 239 // Implementation of LinkInfo
 240 
 241 LinkInfo::LinkInfo(const constantPoolHandle& pool, int index, const methodHandle& current_method, TRAPS) {
 242    // resolve klass
 243   _resolved_klass = pool->klass_ref_at(index, CHECK);
 244 
 245   // Get name, signature, and static klass
 246   _name          = pool->name_ref_at(index);
 247   _signature     = pool->signature_ref_at(index);
 248   _tag           = pool->tag_ref_at(index);
 249   _current_klass = pool->pool_holder();
 250   _current_method = current_method;
 251 
 252   // Coming from the constant pool always checks access
 253   _check_access  = true;
 254 }
 255 
 256 LinkInfo::LinkInfo(const constantPoolHandle& pool, int index, TRAPS) {
 257    // resolve klass
 258   _resolved_klass = pool->klass_ref_at(index, CHECK);
 259 
 260   // Get name, signature, and static klass
 261   _name          = pool->name_ref_at(index);
 262   _signature     = pool->signature_ref_at(index);
 263   _tag           = pool->tag_ref_at(index);
 264   _current_klass = pool->pool_holder();
 265   _current_method = methodHandle();
 266 
 267   // Coming from the constant pool always checks access
 268   _check_access  = true;
 269 }
 270 
 271 char* LinkInfo::method_string() const {
 272   return Method::name_and_sig_as_C_string(_resolved_klass, _name, _signature);
 273 }
 274 
 275 #ifndef PRODUCT
 276 void LinkInfo::print() {
 277   ResourceMark rm;
 278   tty->print_cr("Link resolved_klass=%s name=%s signature=%s current_klass=%s check_access=%s",
 279                 _resolved_klass->name()->as_C_string(),
 280                 _name->as_C_string(),
 281                 _signature->as_C_string(),
 282                 _current_klass == NULL ? "(none)" : _current_klass->name()->as_C_string(),
 283                 _check_access ? "true" : "false");
 284 }
 285 #endif // PRODUCT
 286 //------------------------------------------------------------------------------------------------------------------------
 287 // Klass resolution
 288 
 289 void LinkResolver::check_klass_accessability(Klass* ref_klass, Klass* sel_klass,
 290                                              bool fold_type_to_class, TRAPS) {
 291   Klass* base_klass = sel_klass;
 292   if (fold_type_to_class) {
 293     if (sel_klass->is_objArray_klass()) {
 294       base_klass = ObjArrayKlass::cast(sel_klass)->bottom_klass();
 295     }
 296     // The element type could be a typeArray - we only need the access
 297     // check if it is an reference to another class.
 298     if (!base_klass->is_instance_klass()) {
 299       return;  // no relevant check to do
 300     }
 301   }
 302   Reflection::VerifyClassAccessResults vca_result =
 303     Reflection::verify_class_access(ref_klass, InstanceKlass::cast(base_klass), true);
 304   if (vca_result != Reflection::ACCESS_OK) {
 305     ResourceMark rm(THREAD);
 306     char* msg = Reflection::verify_class_access_msg(ref_klass,
 307                                                     InstanceKlass::cast(base_klass),
 308                                                     vca_result);
 309     if (msg == NULL) {
 310       Exceptions::fthrow(
 311         THREAD_AND_LOCATION,
 312         vmSymbols::java_lang_IllegalAccessError(),
 313         "failed to access class %s from class %s",
 314         base_klass->external_name(),
 315         ref_klass->external_name());
 316     } else {
 317       // Use module specific message returned by verify_class_access_msg().
 318       Exceptions::fthrow(
 319         THREAD_AND_LOCATION,
 320         vmSymbols::java_lang_IllegalAccessError(),
 321         "%s", msg);
 322     }
 323   }
 324 }
 325 
 326 //------------------------------------------------------------------------------------------------------------------------
 327 // Method resolution
 328 //
 329 // According to JVM spec. $5.4.3c & $5.4.3d
 330 
 331 // Look up method in klasses, including static methods
 332 // Then look up local default methods
 333 Method* LinkResolver::lookup_method_in_klasses(const LinkInfo& link_info,
 334                                                bool checkpolymorphism,
 335                                                bool in_imethod_resolve) {
 336   NoSafepointVerifier nsv;  // Method* returned may not be reclaimed
 337 
 338   Klass* klass = link_info.resolved_klass();
 339   Symbol* name = link_info.name();
 340   Symbol* signature = link_info.signature();
 341 
 342   // Ignore overpasses so statics can be found during resolution
 343   Method* result = klass->uncached_lookup_method(name, signature, Klass::skip_overpass);
 344 
 345   if (klass->is_array_klass()) {
 346     // Only consider klass and super klass for arrays
 347     return result;
 348   }
 349 
 350   InstanceKlass* ik = InstanceKlass::cast(klass);
 351 
 352   // JDK 8, JVMS 5.4.3.4: Interface method resolution should
 353   // ignore static and non-public methods of java.lang.Object,
 354   // like clone, finalize, registerNatives.
 355   if (in_imethod_resolve &&
 356       result != NULL &&
 357       ik->is_interface() &&
 358       (result->is_static() || !result->is_public()) &&
 359       result->method_holder() == SystemDictionary::Object_klass()) {
 360     result = NULL;
 361   }
 362 
 363   // Before considering default methods, check for an overpass in the
 364   // current class if a method has not been found.
 365   if (result == NULL) {
 366     result = ik->find_method(name, signature);
 367   }
 368 
 369   if (result == NULL) {
 370     Array<Method*>* default_methods = ik->default_methods();
 371     if (default_methods != NULL) {
 372       result = InstanceKlass::find_method(default_methods, name, signature);
 373     }
 374   }
 375 
 376   if (checkpolymorphism && result != NULL) {
 377     vmIntrinsics::ID iid = result->intrinsic_id();
 378     if (MethodHandles::is_signature_polymorphic(iid)) {
 379       // Do not link directly to these.  The VM must produce a synthetic one using lookup_polymorphic_method.
 380       return NULL;
 381     }
 382   }
 383   return result;
 384 }
 385 
 386 // returns first instance method
 387 // Looks up method in classes, then looks up local default methods
 388 methodHandle LinkResolver::lookup_instance_method_in_klasses(Klass* klass,
 389                                                              Symbol* name,
 390                                                              Symbol* signature,
 391                                                              Klass::PrivateLookupMode private_mode, TRAPS) {
 392   Method* result = klass->uncached_lookup_method(name, signature, Klass::find_overpass, private_mode);
 393 
 394   while (result != NULL && result->is_static() && result->method_holder()->super() != NULL) {
 395     Klass* super_klass = result->method_holder()->super();
 396     result = super_klass->uncached_lookup_method(name, signature, Klass::find_overpass, private_mode);
 397   }
 398 
 399   if (klass->is_array_klass()) {
 400     // Only consider klass and super klass for arrays
 401     return methodHandle(THREAD, result);
 402   }
 403 
 404   if (result == NULL) {
 405     Array<Method*>* default_methods = InstanceKlass::cast(klass)->default_methods();
 406     if (default_methods != NULL) {
 407       result = InstanceKlass::find_method(default_methods, name, signature);
 408       assert(result == NULL || !result->is_static(), "static defaults not allowed");
 409     }
 410   }
 411   return methodHandle(THREAD, result);
 412 }
 413 
 414 int LinkResolver::vtable_index_of_interface_method(Klass* klass,
 415                                                    const methodHandle& resolved_method) {
 416 
 417   int vtable_index = Method::invalid_vtable_index;
 418   Symbol* name = resolved_method->name();
 419   Symbol* signature = resolved_method->signature();
 420   InstanceKlass* ik = InstanceKlass::cast(klass);
 421 
 422   // First check in default method array
 423   if (!resolved_method->is_abstract() && ik->default_methods() != NULL) {
 424     int index = InstanceKlass::find_method_index(ik->default_methods(),
 425                                                  name, signature, Klass::find_overpass,
 426                                                  Klass::find_static, Klass::find_private);
 427     if (index >= 0 ) {
 428       vtable_index = ik->default_vtable_indices()->at(index);
 429     }
 430   }
 431   if (vtable_index == Method::invalid_vtable_index) {
 432     // get vtable_index for miranda methods
 433     klassVtable vt = ik->vtable();
 434     vtable_index = vt.index_of_miranda(name, signature);
 435   }
 436   return vtable_index;
 437 }
 438 
 439 Method* LinkResolver::lookup_method_in_interfaces(const LinkInfo& cp_info) {
 440   InstanceKlass *ik = InstanceKlass::cast(cp_info.resolved_klass());
 441 
 442   // Specify 'true' in order to skip default methods when searching the
 443   // interfaces.  Function lookup_method_in_klasses() already looked for
 444   // the method in the default methods table.
 445   return ik->lookup_method_in_all_interfaces(cp_info.name(), cp_info.signature(), Klass::skip_defaults);
 446 }
 447 
 448 methodHandle LinkResolver::lookup_polymorphic_method(
 449                                              const LinkInfo& link_info,
 450                                              Handle *appendix_result_or_null,
 451                                              Handle *method_type_result,
 452                                              TRAPS) {
 453   Klass* klass = link_info.resolved_klass();
 454   Symbol* name = link_info.name();
 455   Symbol* full_signature = link_info.signature();
 456 
 457   vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name);
 458   if (TraceMethodHandles) {
 459     ResourceMark rm(THREAD);
 460     tty->print_cr("lookup_polymorphic_method iid=%s %s.%s%s",
 461                   vmIntrinsics::name_at(iid), klass->external_name(),
 462                   name->as_C_string(), full_signature->as_C_string());
 463   }
 464   if ((klass == SystemDictionary::MethodHandle_klass() ||
 465        klass == SystemDictionary::VarHandle_klass()) &&
 466       iid != vmIntrinsics::_none) {
 467     if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) {
 468       // Most of these do not need an up-call to Java to resolve, so can be done anywhere.
 469       // Do not erase last argument type (MemberName) if it is a static linkTo method.
 470       bool keep_last_arg = MethodHandles::is_signature_polymorphic_static(iid);
 471       TempNewSymbol basic_signature =
 472         MethodHandles::lookup_basic_type_signature(full_signature, keep_last_arg, CHECK_NULL);
 473       if (TraceMethodHandles) {
 474         ResourceMark rm(THREAD);
 475         tty->print_cr("lookup_polymorphic_method %s %s => basic %s",
 476                       name->as_C_string(),
 477                       full_signature->as_C_string(),
 478                       basic_signature->as_C_string());
 479       }
 480       methodHandle result = SystemDictionary::find_method_handle_intrinsic(iid,
 481                                                               basic_signature,
 482                                                               CHECK_NULL);
 483       if (result.not_null()) {
 484         assert(result->is_method_handle_intrinsic(), "MH.invokeBasic or MH.linkTo* intrinsic");
 485         assert(result->intrinsic_id() != vmIntrinsics::_invokeGeneric, "wrong place to find this");
 486         assert(basic_signature == result->signature(), "predict the result signature");
 487         if (TraceMethodHandles) {
 488           ttyLocker ttyl;
 489           tty->print("lookup_polymorphic_method => intrinsic ");
 490           result->print_on(tty);
 491         }
 492       }
 493       return result;
 494     } else if (iid == vmIntrinsics::_invokeGeneric
 495                && THREAD->can_call_java()
 496                && appendix_result_or_null != NULL) {
 497       // This is a method with type-checking semantics.
 498       // We will ask Java code to spin an adapter method for it.
 499       if (!MethodHandles::enabled()) {
 500         // Make sure the Java part of the runtime has been booted up.
 501         Klass* natives = SystemDictionary::MethodHandleNatives_klass();
 502         if (natives == NULL || InstanceKlass::cast(natives)->is_not_initialized()) {
 503           SystemDictionary::resolve_or_fail(vmSymbols::java_lang_invoke_MethodHandleNatives(),
 504                                             Handle(),
 505                                             Handle(),
 506                                             true,
 507                                             CHECK_NULL);
 508         }
 509       }
 510 
 511       Handle appendix;
 512       Handle method_type;
 513       methodHandle result = SystemDictionary::find_method_handle_invoker(
 514                                                             klass,
 515                                                             name,
 516                                                             full_signature,
 517                                                             link_info.current_klass(),
 518                                                             &appendix,
 519                                                             &method_type,
 520                                                             CHECK_NULL);
 521       if (TraceMethodHandles) {
 522         ttyLocker ttyl;
 523         tty->print("lookup_polymorphic_method => (via Java) ");
 524         result->print_on(tty);
 525         tty->print("  lookup_polymorphic_method => appendix = ");
 526         if (appendix.is_null())  tty->print_cr("(none)");
 527         else                     appendix->print_on(tty);
 528       }
 529       if (result.not_null()) {
 530 #ifdef ASSERT
 531         ResourceMark rm(THREAD);
 532 
 533         TempNewSymbol basic_signature =
 534           MethodHandles::lookup_basic_type_signature(full_signature, CHECK_NULL);
 535         int actual_size_of_params = result->size_of_parameters();
 536         int expected_size_of_params = ArgumentSizeComputer(basic_signature).size();
 537         // +1 for MethodHandle.this, +1 for trailing MethodType
 538         if (!MethodHandles::is_signature_polymorphic_static(iid))  expected_size_of_params += 1;
 539         if (appendix.not_null())                                   expected_size_of_params += 1;
 540         if (actual_size_of_params != expected_size_of_params) {
 541           tty->print_cr("*** basic_signature=%s", basic_signature->as_C_string());
 542           tty->print_cr("*** result for %s: ", vmIntrinsics::name_at(iid));
 543           result->print();
 544         }
 545         assert(actual_size_of_params == expected_size_of_params,
 546                "%d != %d", actual_size_of_params, expected_size_of_params);
 547 #endif //ASSERT
 548 
 549         assert(appendix_result_or_null != NULL, "");
 550         (*appendix_result_or_null) = appendix;
 551         (*method_type_result)      = method_type;
 552       }
 553       return result;
 554     }
 555   }
 556   return NULL;
 557 }
 558 
 559 void LinkResolver::check_method_accessability(Klass* ref_klass,
 560                                               Klass* resolved_klass,
 561                                               Klass* sel_klass,
 562                                               const methodHandle& sel_method,
 563                                               TRAPS) {
 564 
 565   AccessFlags flags = sel_method->access_flags();
 566 
 567   // Special case:  arrays always override "clone". JVMS 2.15.
 568   // If the resolved klass is an array class, and the declaring class
 569   // is java.lang.Object and the method is "clone", set the flags
 570   // to public.
 571   //
 572   // We'll check for the method name first, as that's most likely
 573   // to be false (so we'll short-circuit out of these tests).
 574   if (sel_method->name() == vmSymbols::clone_name() &&
 575       sel_klass == SystemDictionary::Object_klass() &&
 576       resolved_klass->is_array_klass()) {
 577     // We need to change "protected" to "public".
 578     assert(flags.is_protected(), "clone not protected?");
 579     jint new_flags = flags.as_int();
 580     new_flags = new_flags & (~JVM_ACC_PROTECTED);
 581     new_flags = new_flags | JVM_ACC_PUBLIC;
 582     flags.set_flags(new_flags);
 583   }
 584 //  assert(extra_arg_result_or_null != NULL, "must be able to return extra argument");
 585 
 586   bool can_access = Reflection::verify_member_access(ref_klass,
 587                                                      resolved_klass,
 588                                                      sel_klass,
 589                                                      flags,
 590                                                      true, false, CHECK);
 591   // Any existing exceptions that may have been thrown, for example LinkageErrors
 592   // from nest-host resolution, have been allowed to propagate.
 593   if (!can_access) {
 594     ResourceMark rm(THREAD);
 595     bool same_module = (sel_klass->module() == ref_klass->module());
 596     Exceptions::fthrow(
 597       THREAD_AND_LOCATION,
 598       vmSymbols::java_lang_IllegalAccessError(),
 599       "class %s tried to access method %s.%s%s (%s%s%s)",
 600       ref_klass->external_name(),
 601       sel_klass->external_name(),
 602       sel_method->name()->as_C_string(),
 603       sel_method->signature()->as_C_string(),
 604       (same_module) ? ref_klass->joint_in_module_of_loader(sel_klass) : ref_klass->class_in_module_of_loader(),
 605       (same_module) ? "" : "; ",
 606       (same_module) ? "" : sel_klass->class_in_module_of_loader()
 607     );
 608     return;
 609   }
 610 }
 611 
 612 methodHandle LinkResolver::resolve_method_statically(Bytecodes::Code code,
 613                                                      const constantPoolHandle& pool, int index, TRAPS) {
 614   // This method is used only
 615   // (1) in C2 from InlineTree::ok_to_inline (via ciMethod::check_call),
 616   // and
 617   // (2) in Bytecode_invoke::static_target
 618   // It appears to fail when applied to an invokeinterface call site.
 619   // FIXME: Remove this method and ciMethod::check_call; refactor to use the other LinkResolver entry points.
 620   // resolve klass
 621   if (code == Bytecodes::_invokedynamic) {
 622     Klass* resolved_klass = SystemDictionary::MethodHandle_klass();
 623     Symbol* method_name = vmSymbols::invoke_name();
 624     Symbol* method_signature = pool->signature_ref_at(index);
 625     Klass*  current_klass = pool->pool_holder();
 626     LinkInfo link_info(resolved_klass, method_name, method_signature, current_klass);
 627     return resolve_method(link_info, code, THREAD);
 628   }
 629 
 630   LinkInfo link_info(pool, index, methodHandle(), CHECK_NULL);
 631   Klass* resolved_klass = link_info.resolved_klass();
 632 
 633   if (pool->has_preresolution()
 634       || (resolved_klass == SystemDictionary::MethodHandle_klass() &&
 635           MethodHandles::is_signature_polymorphic_name(resolved_klass, link_info.name()))) {
 636     Method* result = ConstantPool::method_at_if_loaded(pool, index);
 637     if (result != NULL) {
 638       return methodHandle(THREAD, result);
 639     }
 640   }
 641 
 642   if (code == Bytecodes::_invokeinterface) {
 643     return resolve_interface_method(link_info, code, THREAD);
 644   } else if (code == Bytecodes::_invokevirtual) {
 645     return resolve_method(link_info, code, THREAD);
 646   } else if (!resolved_klass->is_interface()) {
 647     return resolve_method(link_info, code, THREAD);
 648   } else {
 649     return resolve_interface_method(link_info, code, THREAD);
 650   }
 651 }
 652 
 653 // Check and print a loader constraint violation message for method or interface method
 654 void LinkResolver::check_method_loader_constraints(const LinkInfo& link_info,
 655                                                    const methodHandle& resolved_method,
 656                                                    const char* method_type, TRAPS) {
 657   Handle current_loader(THREAD, link_info.current_klass()->class_loader());
 658   Handle resolved_loader(THREAD, resolved_method->method_holder()->class_loader());
 659 
 660   ResourceMark rm(THREAD);
 661   Symbol* failed_type_symbol =
 662     SystemDictionary::check_signature_loaders(link_info.signature(), current_loader,
 663                                               resolved_loader, true, CHECK);
 664   if (failed_type_symbol != NULL) {
 665     const char* msg = "loader constraint violation: when resolving %s"
 666       " \"%s\" the class loader %s of the current class, %s,"
 667       " and the class loader %s for the method's defining class, %s, have"
 668       " different Class objects for the type %s used in the signature";
 669     char* sig = link_info.method_string();
 670     const char* loader1_name = java_lang_ClassLoader::describe_external(current_loader());
 671     char* current = link_info.current_klass()->name()->as_C_string();
 672     const char* loader2_name = java_lang_ClassLoader::describe_external(resolved_loader());
 673     char* target = resolved_method->method_holder()->name()->as_C_string();
 674     char* failed_type_name = failed_type_symbol->as_C_string();
 675     size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1_name) +
 676       strlen(current) + strlen(loader2_name) + strlen(target) +
 677       strlen(failed_type_name) + strlen(method_type) + 1;
 678     char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen);
 679     jio_snprintf(buf, buflen, msg, method_type, sig, loader1_name, current, loader2_name,
 680                  target, failed_type_name);
 681     THROW_MSG(vmSymbols::java_lang_LinkageError(), buf);
 682   }
 683 }
 684 
 685 void LinkResolver::check_field_loader_constraints(Symbol* field, Symbol* sig,
 686                                                   Klass* current_klass,
 687                                                   Klass* sel_klass, TRAPS) {
 688   Handle ref_loader(THREAD, current_klass->class_loader());
 689   Handle sel_loader(THREAD, sel_klass->class_loader());
 690 
 691   ResourceMark rm(THREAD);  // needed for check_signature_loaders
 692   Symbol* failed_type_symbol =
 693     SystemDictionary::check_signature_loaders(sig,
 694                                               ref_loader, sel_loader,
 695                                               false,
 696                                               CHECK);
 697   if (failed_type_symbol != NULL) {
 698     const char* msg = "loader constraint violation: when resolving field"
 699       " \"%s\" of type %s, the class loader %s of the current class, "
 700       "%s, and the class loader %s for the field's defining "
 701       "type, %s, have different Class objects for type %s";
 702     const char* field_name = field->as_C_string();
 703     const char* loader1_name = java_lang_ClassLoader::describe_external(ref_loader());
 704     const char* sel = sel_klass->external_name();
 705     const char* loader2_name = java_lang_ClassLoader::describe_external(sel_loader());
 706     const char* failed_type_name = failed_type_symbol->as_klass_external_name();
 707     const char* curr_klass_name = current_klass->external_name();
 708     size_t buflen = strlen(msg) + strlen(field_name) + 2 * strlen(failed_type_name) +
 709                     strlen(loader1_name) + strlen(curr_klass_name) +
 710                     strlen(loader2_name) + strlen(sel) + 1;
 711     char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen);
 712     jio_snprintf(buf, buflen, msg, field_name, failed_type_name, loader1_name,
 713                  curr_klass_name, loader2_name, sel, failed_type_name);
 714     THROW_MSG(vmSymbols::java_lang_LinkageError(), buf);
 715   }
 716 }
 717 
 718 methodHandle LinkResolver::resolve_method(const LinkInfo& link_info,
 719                                           Bytecodes::Code code, TRAPS) {
 720 
 721   Handle nested_exception;
 722   Klass* resolved_klass = link_info.resolved_klass();
 723 
 724   // 1. For invokevirtual, cannot call an interface method
 725   if (code == Bytecodes::_invokevirtual && resolved_klass->is_interface()) {
 726     ResourceMark rm(THREAD);
 727     char buf[200];
 728     jio_snprintf(buf, sizeof(buf), "Found interface %s, but class was expected",
 729         resolved_klass->external_name());
 730     THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
 731   }
 732 
 733   // 2. check constant pool tag for called method - must be JVM_CONSTANT_Methodref
 734   if (!link_info.tag().is_invalid() && !link_info.tag().is_method()) {
 735     ResourceMark rm(THREAD);
 736     char buf[200];
 737     jio_snprintf(buf, sizeof(buf), "Method %s must be Methodref constant", link_info.method_string());
 738     THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
 739   }
 740 
 741   // 3. lookup method in resolved klass and its super klasses
 742   methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, true, false));
 743 
 744   // 4. lookup method in all the interfaces implemented by the resolved klass
 745   if (resolved_method.is_null() && !resolved_klass->is_array_klass()) { // not found in the class hierarchy
 746     resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info));
 747 
 748     if (resolved_method.is_null()) {
 749       // JSR 292:  see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc
 750       resolved_method = lookup_polymorphic_method(link_info, (Handle*)NULL, (Handle*)NULL, THREAD);
 751       if (HAS_PENDING_EXCEPTION) {
 752         nested_exception = Handle(THREAD, PENDING_EXCEPTION);
 753         CLEAR_PENDING_EXCEPTION;
 754       }
 755     }
 756   }
 757 
 758   // 5. method lookup failed
 759   if (resolved_method.is_null()) {
 760     ResourceMark rm(THREAD);
 761     THROW_MSG_CAUSE_(vmSymbols::java_lang_NoSuchMethodError(),
 762                     Method::name_and_sig_as_C_string(resolved_klass,
 763                                                      link_info.name(),
 764                                                      link_info.signature()),
 765                     nested_exception, NULL);
 766   }
 767 
 768   // 6. access checks, access checking may be turned off when calling from within the VM.
 769   Klass* current_klass = link_info.current_klass();
 770   if (link_info.check_access()) {
 771     assert(current_klass != NULL , "current_klass should not be null");
 772 
 773     // check if method can be accessed by the referring class
 774     check_method_accessability(current_klass,
 775                                resolved_klass,
 776                                resolved_method->method_holder(),
 777                                resolved_method,
 778                                CHECK_NULL);
 779 
 780     // check loader constraints
 781     check_method_loader_constraints(link_info, resolved_method, "method", CHECK_NULL);
 782   }
 783 
 784   // For private method invocation we should only find the method in the resolved class.
 785   // If that is not the case then we have a found a supertype method that we have nestmate
 786   // access to.
 787   if (resolved_method->is_private() && resolved_method->method_holder() != resolved_klass) {
 788     ResourceMark rm(THREAD);
 789     DEBUG_ONLY(bool is_nestmate = InstanceKlass::cast(link_info.current_klass())->has_nestmate_access_to(InstanceKlass::cast(resolved_klass), THREAD);)
 790     assert(is_nestmate, "was only expecting nestmates to get here!");
 791     Exceptions::fthrow(
 792       THREAD_AND_LOCATION,
 793       vmSymbols::java_lang_NoSuchMethodError(),
 794       "%s: method %s%s not found",
 795       resolved_klass->external_name(),
 796       resolved_method->name()->as_C_string(),
 797       resolved_method->signature()->as_C_string()
 798     );
 799     return NULL;
 800   }
 801 
 802   return resolved_method;
 803 }
 804 
 805 static void trace_method_resolution(const char* prefix,
 806                                     Klass* klass,
 807                                     Klass* resolved_klass,
 808                                     const methodHandle& method,
 809                                     bool logitables,
 810                                     int index = -1) {
 811 #ifndef PRODUCT
 812   ResourceMark rm;
 813   Log(itables) logi;
 814   LogStream lsi(logi.trace());
 815   Log(vtables) logv;
 816   LogStream lsv(logv.trace());
 817   outputStream* st;
 818   if (logitables) {
 819     st = &lsi;
 820   } else {
 821     st = &lsv;
 822   }
 823   st->print("%s%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ",
 824             prefix,
 825             (klass == NULL ? "<NULL>" : klass->internal_name()),
 826             (resolved_klass == NULL ? "<NULL>" : resolved_klass->internal_name()),
 827             Method::name_and_sig_as_C_string(resolved_klass,
 828                                              method->name(),
 829                                              method->signature()),
 830             method->method_holder()->internal_name());
 831   method->print_linkage_flags(st);
 832   if (index != -1) {
 833     st->print("vtable_index:%d", index);
 834   }
 835   st->cr();
 836 #endif // PRODUCT
 837 }
 838 
 839 // Do linktime resolution of a method in the interface within the context of the specied bytecode.
 840 methodHandle LinkResolver::resolve_interface_method(const LinkInfo& link_info, Bytecodes::Code code, TRAPS) {
 841 
 842   Klass* resolved_klass = link_info.resolved_klass();
 843 
 844   // check if klass is interface
 845   if (!resolved_klass->is_interface()) {
 846     ResourceMark rm(THREAD);
 847     char buf[200];
 848     jio_snprintf(buf, sizeof(buf), "Found class %s, but interface was expected", resolved_klass->external_name());
 849     THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
 850   }
 851 
 852   // check constant pool tag for called method - must be JVM_CONSTANT_InterfaceMethodref
 853   if (!link_info.tag().is_invalid() && !link_info.tag().is_interface_method()) {
 854     ResourceMark rm(THREAD);
 855     char buf[200];
 856     jio_snprintf(buf, sizeof(buf), "Method %s must be InterfaceMethodref constant", link_info.method_string());
 857     THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
 858   }
 859 
 860   // lookup method in this interface or its super, java.lang.Object
 861   // JDK8: also look for static methods
 862   methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, false, true));
 863 
 864   if (resolved_method.is_null() && !resolved_klass->is_array_klass()) {
 865     // lookup method in all the super-interfaces
 866     resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info));
 867   }
 868 
 869   if (resolved_method.is_null()) {
 870     // no method found
 871     ResourceMark rm(THREAD);
 872     THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(),
 873                    Method::name_and_sig_as_C_string(resolved_klass,
 874                                                     link_info.name(),
 875                                                     link_info.signature()));
 876   }
 877 
 878   if (link_info.check_access()) {
 879     // JDK8 adds non-public interface methods, and accessability check requirement
 880     Klass* current_klass = link_info.current_klass();
 881 
 882     assert(current_klass != NULL , "current_klass should not be null");
 883 
 884     // check if method can be accessed by the referring class
 885     check_method_accessability(current_klass,
 886                                resolved_klass,
 887                                resolved_method->method_holder(),
 888                                resolved_method,
 889                                CHECK_NULL);
 890 
 891     check_method_loader_constraints(link_info, resolved_method, "interface method", CHECK_NULL);
 892   }
 893 
 894   if (code != Bytecodes::_invokestatic && resolved_method->is_static()) {
 895     ResourceMark rm(THREAD);
 896     char buf[200];
 897     jio_snprintf(buf, sizeof(buf), "Expected instance not static method %s",
 898                  Method::name_and_sig_as_C_string(resolved_klass,
 899                  resolved_method->name(), resolved_method->signature()));
 900     THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
 901   }
 902 
 903   if (log_develop_is_enabled(Trace, itables)) {
 904     char buf[200];
 905     jio_snprintf(buf, sizeof(buf), "%s resolved interface method: caller-class:",
 906                  Bytecodes::name(code));
 907     trace_method_resolution(buf, link_info.current_klass(), resolved_klass,
 908                             resolved_method, true);
 909   }
 910 
 911   return resolved_method;
 912 }
 913 
 914 //------------------------------------------------------------------------------------------------------------------------
 915 // Field resolution
 916 
 917 void LinkResolver::check_field_accessability(Klass* ref_klass,
 918                                              Klass* resolved_klass,
 919                                              Klass* sel_klass,
 920                                              const fieldDescriptor& fd,
 921                                              TRAPS) {
 922   bool can_access = Reflection::verify_member_access(ref_klass,
 923                                                      resolved_klass,
 924                                                      sel_klass,
 925                                                      fd.access_flags(),
 926                                                      true, false, CHECK);
 927   // Any existing exceptions that may have been thrown, for example LinkageErrors
 928   // from nest-host resolution, have been allowed to propagate.
 929   if (!can_access) {
 930     ResourceMark rm(THREAD);
 931     Exceptions::fthrow(
 932       THREAD_AND_LOCATION,
 933       vmSymbols::java_lang_IllegalAccessError(),
 934       "tried to access field %s.%s from class %s",
 935       sel_klass->external_name(),
 936       fd.name()->as_C_string(),
 937       ref_klass->external_name()
 938     );
 939     return;
 940   }
 941 }
 942 
 943 void LinkResolver::resolve_field_access(fieldDescriptor& fd, const constantPoolHandle& pool, int index, const methodHandle& method, Bytecodes::Code byte, TRAPS) {
 944   LinkInfo link_info(pool, index, method, CHECK);
 945   resolve_field(fd, link_info, byte, true, CHECK);
 946 }
 947 
 948 void LinkResolver::resolve_field(fieldDescriptor& fd,
 949                                  const LinkInfo& link_info,
 950                                  Bytecodes::Code byte, bool initialize_class,
 951                                  TRAPS) {
 952   assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic ||
 953          byte == Bytecodes::_getfield  || byte == Bytecodes::_putfield  ||
 954          byte == Bytecodes::_nofast_getfield  || byte == Bytecodes::_nofast_putfield  ||
 955          (byte == Bytecodes::_nop && !link_info.check_access()), "bad field access bytecode");
 956 
 957   bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic);
 958   bool is_put    = (byte == Bytecodes::_putfield  || byte == Bytecodes::_putstatic || byte == Bytecodes::_nofast_putfield);
 959   // Check if there's a resolved klass containing the field
 960   Klass* resolved_klass = link_info.resolved_klass();
 961   Symbol* field = link_info.name();
 962   Symbol* sig = link_info.signature();
 963 
 964   if (resolved_klass == NULL) {
 965     ResourceMark rm(THREAD);
 966     THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
 967   }
 968 
 969   // Resolve instance field
 970   Klass* sel_klass = resolved_klass->find_field(field, sig, &fd);
 971   // check if field exists; i.e., if a klass containing the field def has been selected
 972   if (sel_klass == NULL) {
 973     ResourceMark rm(THREAD);
 974     THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
 975   }
 976 
 977   if (!link_info.check_access())
 978     // Access checking may be turned off when calling from within the VM.
 979     return;
 980 
 981   // check access
 982   Klass* current_klass = link_info.current_klass();
 983   check_field_accessability(current_klass, resolved_klass, sel_klass, fd, CHECK);
 984 
 985   // check for errors
 986   if (is_static != fd.is_static()) {
 987     ResourceMark rm(THREAD);
 988     char msg[200];
 989     jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string());
 990     THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg);
 991   }
 992 
 993   // A final field can be modified only
 994   // (1) by methods declared in the class declaring the field and
 995   // (2) by the <clinit> method (in case of a static field)
 996   //     or by the <init> method (in case of an instance field).
 997   if (is_put && fd.access_flags().is_final()) {
 998     ResourceMark rm(THREAD);
 999     stringStream ss;
1000 
1001     if (sel_klass != current_klass) {
1002       ss.print("Update to %s final field %s.%s attempted from a different class (%s) than the field's declaring class",
1003                 is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(),
1004                 current_klass->external_name());
1005       THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
1006     }
1007 
1008     if (fd.constants()->pool_holder()->major_version() >= 53) {
1009       methodHandle m = link_info.current_method();
1010       assert(!m.is_null(), "information about the current method must be available for 'put' bytecodes");
1011       bool is_initialized_static_final_update = (byte == Bytecodes::_putstatic &&
1012                                                  fd.is_static() &&
1013                                                  !m()->is_static_initializer());
1014       bool is_initialized_instance_final_update = ((byte == Bytecodes::_putfield || byte == Bytecodes::_nofast_putfield) &&
1015                                                    !fd.is_static() &&
1016                                                    !m->is_object_initializer());
1017 
1018       if (is_initialized_static_final_update || is_initialized_instance_final_update) {
1019         ss.print("Update to %s final field %s.%s attempted from a different method (%s) than the initializer method %s ",
1020                  is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(),
1021                  m()->name()->as_C_string(),
1022                  is_static ? "<clinit>" : "<init>");
1023         THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
1024       }
1025     }
1026   }
1027 
1028   // initialize resolved_klass if necessary
1029   // note 1: the klass which declared the field must be initialized (i.e, sel_klass)
1030   //         according to the newest JVM spec (5.5, p.170) - was bug (gri 7/28/99)
1031   //
1032   // note 2: we don't want to force initialization if we are just checking
1033   //         if the field access is legal; e.g., during compilation
1034   if (is_static && initialize_class) {
1035     sel_klass->initialize(CHECK);
1036   }
1037 
1038   if (sel_klass != current_klass) {
1039     check_field_loader_constraints(field, sig, current_klass, sel_klass, CHECK);
1040   }
1041 
1042   // return information. note that the klass is set to the actual klass containing the
1043   // field, otherwise access of static fields in superclasses will not work.
1044 }
1045 
1046 
1047 //------------------------------------------------------------------------------------------------------------------------
1048 // Invoke resolution
1049 //
1050 // Naming conventions:
1051 //
1052 // resolved_method    the specified method (i.e., static receiver specified via constant pool index)
1053 // sel_method         the selected method  (selected via run-time lookup; e.g., based on dynamic receiver class)
1054 // resolved_klass     the specified klass  (i.e., specified via constant pool index)
1055 // recv_klass         the receiver klass
1056 
1057 
1058 void LinkResolver::resolve_static_call(CallInfo& result,
1059                                        const LinkInfo& link_info,
1060                                        bool initialize_class, TRAPS) {
1061   methodHandle resolved_method = linktime_resolve_static_method(link_info, CHECK);
1062 
1063   // The resolved class can change as a result of this resolution.
1064   Klass* resolved_klass = resolved_method->method_holder();
1065 
1066   // Initialize klass (this should only happen if everything is ok)
1067   if (initialize_class && resolved_klass->should_be_initialized()) {
1068     resolved_klass->initialize(CHECK);
1069     // Use updated LinkInfo to reresolve with resolved method holder
1070     LinkInfo new_info(resolved_klass, link_info.name(), link_info.signature(),
1071                       link_info.current_klass(),
1072                       link_info.check_access() ? LinkInfo::needs_access_check : LinkInfo::skip_access_check);
1073     resolved_method = linktime_resolve_static_method(new_info, CHECK);
1074   }
1075 
1076   // setup result
1077   result.set_static(resolved_klass, resolved_method, CHECK);
1078 }
1079 
1080 // throws linktime exceptions
1081 methodHandle LinkResolver::linktime_resolve_static_method(const LinkInfo& link_info, TRAPS) {
1082 
1083   Klass* resolved_klass = link_info.resolved_klass();
1084   methodHandle resolved_method;
1085   if (!resolved_klass->is_interface()) {
1086     resolved_method = resolve_method(link_info, Bytecodes::_invokestatic, CHECK_NULL);
1087   } else {
1088     resolved_method = resolve_interface_method(link_info, Bytecodes::_invokestatic, CHECK_NULL);
1089   }
1090   assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier");
1091 
1092   // check if static
1093   if (!resolved_method->is_static()) {
1094     ResourceMark rm(THREAD);
1095     char buf[200];
1096     jio_snprintf(buf, sizeof(buf), "Expected static method %s", Method::name_and_sig_as_C_string(resolved_klass,
1097                                                       resolved_method->name(),
1098                                                       resolved_method->signature()));
1099     THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1100   }
1101   return resolved_method;
1102 }
1103 
1104 
1105 void LinkResolver::resolve_special_call(CallInfo& result,
1106                                         Handle recv,
1107                                         const LinkInfo& link_info,
1108                                         TRAPS) {
1109   methodHandle resolved_method = linktime_resolve_special_method(link_info, CHECK);
1110   runtime_resolve_special_method(result, link_info, resolved_method, recv, CHECK);
1111 }
1112 
1113 // throws linktime exceptions
1114 methodHandle LinkResolver::linktime_resolve_special_method(const LinkInfo& link_info,
1115                                                            TRAPS) {
1116 
1117   // Invokespecial is called for multiple special reasons:
1118   // <init>
1119   // local private method invocation, for classes and interfaces
1120   // superclass.method, which can also resolve to a default method
1121   // and the selected method is recalculated relative to the direct superclass
1122   // superinterface.method, which explicitly does not check shadowing
1123   Klass* resolved_klass = link_info.resolved_klass();
1124   methodHandle resolved_method;
1125 
1126   if (!resolved_klass->is_interface()) {
1127     resolved_method = resolve_method(link_info, Bytecodes::_invokespecial, CHECK_NULL);
1128   } else {
1129     resolved_method = resolve_interface_method(link_info, Bytecodes::_invokespecial, CHECK_NULL);
1130   }
1131 
1132   // check if method name is <init>, that it is found in same klass as static type
1133   if (resolved_method->name() == vmSymbols::object_initializer_name() &&
1134       resolved_method->method_holder() != resolved_klass) {
1135     ResourceMark rm(THREAD);
1136     Exceptions::fthrow(
1137       THREAD_AND_LOCATION,
1138       vmSymbols::java_lang_NoSuchMethodError(),
1139       "%s: method %s%s not found",
1140       resolved_klass->external_name(),
1141       resolved_method->name()->as_C_string(),
1142       resolved_method->signature()->as_C_string()
1143     );
1144     return NULL;
1145   }
1146 
1147   // ensure that invokespecial's interface method reference is in
1148   // a direct superinterface, not an indirect superinterface
1149   Klass* current_klass = link_info.current_klass();
1150   if (current_klass != NULL && resolved_klass->is_interface()) {
1151     InstanceKlass* ck = InstanceKlass::cast(current_klass);
1152     InstanceKlass *klass_to_check = !ck->is_anonymous() ?
1153                                     ck :
1154                                     InstanceKlass::cast(ck->host_klass());
1155     // Disable verification for the dynamically-generated reflection bytecodes.
1156     bool is_reflect = klass_to_check->is_subclass_of(
1157                         SystemDictionary::reflect_MagicAccessorImpl_klass());
1158 
1159     if (!is_reflect &&
1160         !klass_to_check->is_same_or_direct_interface(resolved_klass)) {
1161       ResourceMark rm(THREAD);
1162       char buf[200];
1163       jio_snprintf(buf, sizeof(buf),
1164                    "Interface method reference: %s, is in an indirect superinterface of %s",
1165                    Method::name_and_sig_as_C_string(resolved_klass,
1166                                                                            resolved_method->name(),
1167                                                                            resolved_method->signature()),
1168                    current_klass->external_name());
1169       THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1170     }
1171   }
1172 
1173   // check if not static
1174   if (resolved_method->is_static()) {
1175     ResourceMark rm(THREAD);
1176     char buf[200];
1177     jio_snprintf(buf, sizeof(buf),
1178                  "Expecting non-static method %s",
1179                  Method::name_and_sig_as_C_string(resolved_klass,
1180                                                   resolved_method->name(),
1181                                                   resolved_method->signature()));
1182     THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1183   }
1184 
1185   if (log_develop_is_enabled(Trace, itables)) {
1186     trace_method_resolution("invokespecial resolved method: caller-class:",
1187                             current_klass, resolved_klass, resolved_method, true);
1188   }
1189 
1190   return resolved_method;
1191 }
1192 
1193 // throws runtime exceptions
1194 void LinkResolver::runtime_resolve_special_method(CallInfo& result,
1195                                                   const LinkInfo& link_info,
1196                                                   const methodHandle& resolved_method,
1197                                                   Handle recv, TRAPS) {
1198 
1199   Klass* resolved_klass = link_info.resolved_klass();
1200 
1201   // resolved method is selected method unless we have an old-style lookup
1202   // for a superclass method
1203   // Invokespecial for a superinterface, resolved method is selected method,
1204   // no checks for shadowing
1205   methodHandle sel_method(THREAD, resolved_method());
1206 
1207   if (link_info.check_access() &&
1208       // check if the method is not <init>
1209       resolved_method->name() != vmSymbols::object_initializer_name()) {
1210 
1211      // check if this is an old-style super call and do a new lookup if so
1212      // a) check if ACC_SUPER flag is set for the current class
1213     Klass* current_klass = link_info.current_klass();
1214     if ((current_klass->is_super() || !AllowNonVirtualCalls) &&
1215         // b) check if the class of the resolved_klass is a superclass
1216         // (not supertype in order to exclude interface classes) of the current class.
1217         // This check is not performed for super.invoke for interface methods
1218         // in super interfaces.
1219         current_klass->is_subclass_of(resolved_klass) &&
1220         current_klass != resolved_klass
1221         ) {
1222       // Lookup super method
1223       Klass* super_klass = current_klass->super();
1224       sel_method = lookup_instance_method_in_klasses(super_klass,
1225                                                      resolved_method->name(),
1226                                                      resolved_method->signature(),
1227                                                      Klass::find_private, CHECK);
1228       // check if found
1229       if (sel_method.is_null()) {
1230         ResourceMark rm(THREAD);
1231         THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1232                   Method::name_and_sig_as_C_string(resolved_klass,
1233                                             resolved_method->name(),
1234                                             resolved_method->signature()));
1235       // check loader constraints if found a different method
1236       } else if (sel_method() != resolved_method()) {
1237         check_method_loader_constraints(link_info, sel_method, "method", CHECK);
1238       }
1239     }
1240 
1241     // Check that the class of objectref (the receiver) is the current class or interface,
1242     // or a subtype of the current class or interface (the sender), otherwise invokespecial
1243     // throws IllegalAccessError.
1244     // The verifier checks that the sender is a subtype of the class in the I/MR operand.
1245     // The verifier also checks that the receiver is a subtype of the sender, if the sender is
1246     // a class.  If the sender is an interface, the check has to be performed at runtime.
1247     InstanceKlass* sender = InstanceKlass::cast(current_klass);
1248     sender = sender->is_anonymous() ? sender->host_klass() : sender;
1249     if (sender->is_interface() && recv.not_null()) {
1250       Klass* receiver_klass = recv->klass();
1251       if (!receiver_klass->is_subtype_of(sender)) {
1252         ResourceMark rm(THREAD);
1253         char buf[500];
1254         jio_snprintf(buf, sizeof(buf),
1255                      "Receiver class %s must be the current class or a subtype of interface %s",
1256                      receiver_klass->name()->as_C_string(),
1257                      sender->name()->as_C_string());
1258         THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), buf);
1259       }
1260     }
1261   }
1262 
1263   // check if not static
1264   if (sel_method->is_static()) {
1265     ResourceMark rm(THREAD);
1266     char buf[200];
1267     jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass,
1268                                                                                       resolved_method->name(),
1269                                                                                       resolved_method->signature()));
1270     THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1271   }
1272 
1273   // check if abstract
1274   if (sel_method->is_abstract()) {
1275     ResourceMark rm(THREAD);
1276     THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1277               Method::name_and_sig_as_C_string(resolved_klass,
1278                                                sel_method->name(),
1279                                                sel_method->signature()));
1280   }
1281 
1282   if (log_develop_is_enabled(Trace, itables)) {
1283     trace_method_resolution("invokespecial selected method: resolved-class:",
1284                             resolved_klass, resolved_klass, sel_method, true);
1285   }
1286 
1287   // setup result
1288   result.set_static(resolved_klass, sel_method, CHECK);
1289 }
1290 
1291 void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, Klass* receiver_klass,
1292                                         const LinkInfo& link_info,
1293                                         bool check_null_and_abstract, TRAPS) {
1294   methodHandle resolved_method = linktime_resolve_virtual_method(link_info, CHECK);
1295   runtime_resolve_virtual_method(result, resolved_method,
1296                                  link_info.resolved_klass(),
1297                                  recv, receiver_klass,
1298                                  check_null_and_abstract, CHECK);
1299 }
1300 
1301 // throws linktime exceptions
1302 methodHandle LinkResolver::linktime_resolve_virtual_method(const LinkInfo& link_info,
1303                                                            TRAPS) {
1304   // normal method resolution
1305   methodHandle resolved_method = resolve_method(link_info, Bytecodes::_invokevirtual, CHECK_NULL);
1306 
1307   assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1308   assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1309 
1310   // check if private interface method
1311   Klass* resolved_klass = link_info.resolved_klass();
1312   Klass* current_klass = link_info.current_klass();
1313 
1314   // This is impossible, if resolve_klass is an interface, we've thrown icce in resolve_method
1315   if (resolved_klass->is_interface() && resolved_method->is_private()) {
1316     ResourceMark rm(THREAD);
1317     char buf[200];
1318     jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokevirtual: method %s, caller-class:%s",
1319                  Method::name_and_sig_as_C_string(resolved_klass,
1320                                                   resolved_method->name(),
1321                                                   resolved_method->signature()),
1322                    (current_klass == NULL ? "<NULL>" : current_klass->internal_name()));
1323     THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1324   }
1325 
1326   // check if not static
1327   if (resolved_method->is_static()) {
1328     ResourceMark rm(THREAD);
1329     char buf[200];
1330     jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass,
1331                                                                                            resolved_method->name(),
1332                                                                                            resolved_method->signature()));
1333     THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1334   }
1335 
1336   if (log_develop_is_enabled(Trace, vtables)) {
1337     trace_method_resolution("invokevirtual resolved method: caller-class:",
1338                             current_klass, resolved_klass, resolved_method, false);
1339   }
1340 
1341   return resolved_method;
1342 }
1343 
1344 // throws runtime exceptions
1345 void LinkResolver::runtime_resolve_virtual_method(CallInfo& result,
1346                                                   const methodHandle& resolved_method,
1347                                                   Klass* resolved_klass,
1348                                                   Handle recv,
1349                                                   Klass* recv_klass,
1350                                                   bool check_null_and_abstract,
1351                                                   TRAPS) {
1352 
1353   // setup default return values
1354   int vtable_index = Method::invalid_vtable_index;
1355   methodHandle selected_method;
1356 
1357   // runtime method resolution
1358   if (check_null_and_abstract && recv.is_null()) { // check if receiver exists
1359     THROW(vmSymbols::java_lang_NullPointerException());
1360   }
1361 
1362   // Virtual methods cannot be resolved before its klass has been linked, for otherwise the Method*'s
1363   // has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since
1364   // a missing receiver might result in a bogus lookup.
1365   assert(resolved_method->method_holder()->is_linked(), "must be linked");
1366 
1367   // do lookup based on receiver klass using the vtable index
1368   if (resolved_method->method_holder()->is_interface()) { // default or miranda method
1369     vtable_index = vtable_index_of_interface_method(resolved_klass, resolved_method);
1370     assert(vtable_index >= 0 , "we should have valid vtable index at this point");
1371 
1372     selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1373   } else {
1374     // at this point we are sure that resolved_method is virtual and not
1375     // a default or miranda method; therefore, it must have a valid vtable index.
1376     assert(!resolved_method->has_itable_index(), "");
1377     vtable_index = resolved_method->vtable_index();
1378     // We could get a negative vtable_index of nonvirtual_vtable_index for private
1379     // methods, or for final methods. Private methods never appear in the vtable
1380     // and never override other methods. As an optimization, final methods are
1381     // never put in the vtable, unless they override an existing method.
1382     // So if we do get nonvirtual_vtable_index, it means the selected method is the
1383     // resolved method, and it can never be changed by an override.
1384     if (vtable_index == Method::nonvirtual_vtable_index) {
1385       assert(resolved_method->can_be_statically_bound(), "cannot override this method");
1386       selected_method = resolved_method;
1387     } else {
1388       selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1389     }
1390   }
1391 
1392   // check if method exists
1393   if (selected_method.is_null()) {
1394     throw_abstract_method_error(resolved_method, recv_klass, CHECK);
1395   }
1396 
1397   // check if abstract
1398   if (check_null_and_abstract && selected_method->is_abstract()) {
1399     // Pass arguments for generating a verbose error message.
1400     throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK);
1401   }
1402 
1403   if (log_develop_is_enabled(Trace, vtables)) {
1404     trace_method_resolution("invokevirtual selected method: receiver-class:",
1405                             recv_klass, resolved_klass, selected_method,
1406                             false, vtable_index);
1407   }
1408   // setup result
1409   result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK);
1410 }
1411 
1412 void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, Klass* recv_klass,
1413                                           const LinkInfo& link_info,
1414                                           bool check_null_and_abstract, TRAPS) {
1415   // throws linktime exceptions
1416   methodHandle resolved_method = linktime_resolve_interface_method(link_info, CHECK);
1417   runtime_resolve_interface_method(result, resolved_method,link_info.resolved_klass(),
1418                                    recv, recv_klass, check_null_and_abstract, CHECK);
1419 }
1420 
1421 methodHandle LinkResolver::linktime_resolve_interface_method(const LinkInfo& link_info,
1422                                                              TRAPS) {
1423   // normal interface method resolution
1424   methodHandle resolved_method = resolve_interface_method(link_info, Bytecodes::_invokeinterface, CHECK_NULL);
1425   assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1426   assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1427 
1428   return resolved_method;
1429 }
1430 
1431 // throws runtime exceptions
1432 void LinkResolver::runtime_resolve_interface_method(CallInfo& result,
1433                                                     const methodHandle& resolved_method,
1434                                                     Klass* resolved_klass,
1435                                                     Handle recv,
1436                                                     Klass* recv_klass,
1437                                                     bool check_null_and_abstract, TRAPS) {
1438 
1439   // check if receiver exists
1440   if (check_null_and_abstract && recv.is_null()) {
1441     THROW(vmSymbols::java_lang_NullPointerException());
1442   }
1443 
1444   // check if receiver klass implements the resolved interface
1445   if (!recv_klass->is_subtype_of(resolved_klass)) {
1446     ResourceMark rm(THREAD);
1447     char buf[200];
1448     jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s",
1449                  recv_klass->external_name(),
1450                  resolved_klass->external_name());
1451     THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1452   }
1453 
1454   methodHandle selected_method = resolved_method;
1455 
1456   // resolve the method in the receiver class, unless it is private
1457   if (!resolved_method()->is_private()) {
1458     // do lookup based on receiver klass
1459     // This search must match the linktime preparation search for itable initialization
1460     // to correctly enforce loader constraints for interface method inheritance.
1461     // Private methods are skipped as the resolved method was not private.
1462     selected_method = lookup_instance_method_in_klasses(recv_klass,
1463                                                         resolved_method->name(),
1464                                                         resolved_method->signature(),
1465                                                         Klass::skip_private, CHECK);
1466 
1467     if (selected_method.is_null() && !check_null_and_abstract) {
1468       // In theory this is a harmless placeholder value, but
1469       // in practice leaving in null affects the nsk default method tests.
1470       // This needs further study.
1471       selected_method = resolved_method;
1472     }
1473     // check if method exists
1474     if (selected_method.is_null()) {
1475       // Pass arguments for generating a verbose error message.
1476       throw_abstract_method_error(resolved_method, recv_klass, CHECK);
1477     }
1478     // check access
1479     // Throw Illegal Access Error if selected_method is not public.
1480     if (!selected_method->is_public()) {
1481       ResourceMark rm(THREAD);
1482       THROW_MSG(vmSymbols::java_lang_IllegalAccessError(),
1483                 Method::name_and_sig_as_C_string(recv_klass,
1484                                                  selected_method->name(),
1485                                                  selected_method->signature()));
1486     }
1487     // check if abstract
1488     if (check_null_and_abstract && selected_method->is_abstract()) {
1489       throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK);
1490     }
1491   }
1492 
1493   if (log_develop_is_enabled(Trace, itables)) {
1494     trace_method_resolution("invokeinterface selected method: receiver-class:",
1495                             recv_klass, resolved_klass, selected_method, true);
1496   }
1497   // setup result
1498   if (resolved_method->has_vtable_index()) {
1499     int vtable_index = resolved_method->vtable_index();
1500     log_develop_trace(itables)("  -- vtable index: %d", vtable_index);
1501     assert(vtable_index == selected_method->vtable_index(), "sanity check");
1502     result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK);
1503   } else if (resolved_method->has_itable_index()) {
1504     int itable_index = resolved_method()->itable_index();
1505     log_develop_trace(itables)("  -- itable index: %d", itable_index);
1506     result.set_interface(resolved_klass, recv_klass, resolved_method, selected_method, itable_index, CHECK);
1507   } else {
1508     int index = resolved_method->vtable_index();
1509     log_develop_trace(itables)("  -- non itable/vtable index: %d", index);
1510     assert(index == Method::nonvirtual_vtable_index, "Oops hit another case!");
1511     assert(resolved_method()->is_private() ||
1512            (resolved_method()->is_final() && resolved_method->method_holder() == SystemDictionary::Object_klass()),
1513            "Should only have non-virtual invokeinterface for private or final-Object methods!");
1514     assert(resolved_method()->can_be_statically_bound(), "Should only have non-virtual invokeinterface for statically bound methods!");
1515     // This sets up the nonvirtual form of "virtual" call (as needed for final and private methods)
1516     result.set_virtual(resolved_klass, resolved_klass, resolved_method, resolved_method, index, CHECK);
1517   }
1518 }
1519 
1520 
1521 methodHandle LinkResolver::linktime_resolve_interface_method_or_null(
1522                                                  const LinkInfo& link_info) {
1523   EXCEPTION_MARK;
1524   methodHandle method_result = linktime_resolve_interface_method(link_info, THREAD);
1525   if (HAS_PENDING_EXCEPTION) {
1526     CLEAR_PENDING_EXCEPTION;
1527     return methodHandle();
1528   } else {
1529     return method_result;
1530   }
1531 }
1532 
1533 methodHandle LinkResolver::linktime_resolve_virtual_method_or_null(
1534                                                  const LinkInfo& link_info) {
1535   EXCEPTION_MARK;
1536   methodHandle method_result = linktime_resolve_virtual_method(link_info, THREAD);
1537   if (HAS_PENDING_EXCEPTION) {
1538     CLEAR_PENDING_EXCEPTION;
1539     return methodHandle();
1540   } else {
1541     return method_result;
1542   }
1543 }
1544 
1545 methodHandle LinkResolver::resolve_virtual_call_or_null(
1546                                                  Klass* receiver_klass,
1547                                                  const LinkInfo& link_info) {
1548   EXCEPTION_MARK;
1549   CallInfo info;
1550   resolve_virtual_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1551   if (HAS_PENDING_EXCEPTION) {
1552     CLEAR_PENDING_EXCEPTION;
1553     return methodHandle();
1554   }
1555   return info.selected_method();
1556 }
1557 
1558 methodHandle LinkResolver::resolve_interface_call_or_null(
1559                                                  Klass* receiver_klass,
1560                                                  const LinkInfo& link_info) {
1561   EXCEPTION_MARK;
1562   CallInfo info;
1563   resolve_interface_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1564   if (HAS_PENDING_EXCEPTION) {
1565     CLEAR_PENDING_EXCEPTION;
1566     return methodHandle();
1567   }
1568   return info.selected_method();
1569 }
1570 
1571 int LinkResolver::resolve_virtual_vtable_index(Klass* receiver_klass,
1572                                                const LinkInfo& link_info) {
1573   EXCEPTION_MARK;
1574   CallInfo info;
1575   resolve_virtual_call(info, Handle(), receiver_klass, link_info,
1576                        /*check_null_or_abstract*/false, THREAD);
1577   if (HAS_PENDING_EXCEPTION) {
1578     CLEAR_PENDING_EXCEPTION;
1579     return Method::invalid_vtable_index;
1580   }
1581   return info.vtable_index();
1582 }
1583 
1584 methodHandle LinkResolver::resolve_static_call_or_null(const LinkInfo& link_info) {
1585   EXCEPTION_MARK;
1586   CallInfo info;
1587   resolve_static_call(info, link_info, /*initialize_class*/false, THREAD);
1588   if (HAS_PENDING_EXCEPTION) {
1589     CLEAR_PENDING_EXCEPTION;
1590     return methodHandle();
1591   }
1592   return info.selected_method();
1593 }
1594 
1595 methodHandle LinkResolver::resolve_special_call_or_null(const LinkInfo& link_info) {
1596   EXCEPTION_MARK;
1597   CallInfo info;
1598   resolve_special_call(info, Handle(), link_info, THREAD);
1599   if (HAS_PENDING_EXCEPTION) {
1600     CLEAR_PENDING_EXCEPTION;
1601     return methodHandle();
1602   }
1603   return info.selected_method();
1604 }
1605 
1606 
1607 
1608 //------------------------------------------------------------------------------------------------------------------------
1609 // ConstantPool entries
1610 
1611 void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) {
1612   switch (byte) {
1613     case Bytecodes::_invokestatic   : resolve_invokestatic   (result,       pool, index, CHECK); break;
1614     case Bytecodes::_invokespecial  : resolve_invokespecial  (result, recv, pool, index, CHECK); break;
1615     case Bytecodes::_invokevirtual  : resolve_invokevirtual  (result, recv, pool, index, CHECK); break;
1616     case Bytecodes::_invokehandle   : resolve_invokehandle   (result,       pool, index, CHECK); break;
1617     case Bytecodes::_invokedynamic  : resolve_invokedynamic  (result,       pool, index, CHECK); break;
1618     case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break;
1619     default                         :                                                            break;
1620   }
1621   return;
1622 }
1623 
1624 void LinkResolver::resolve_invoke(CallInfo& result, Handle& recv,
1625                              const methodHandle& attached_method,
1626                              Bytecodes::Code byte, TRAPS) {
1627   Klass* defc = attached_method->method_holder();
1628   Symbol* name = attached_method->name();
1629   Symbol* type = attached_method->signature();
1630   LinkInfo link_info(defc, name, type);
1631   switch(byte) {
1632     case Bytecodes::_invokevirtual:
1633       resolve_virtual_call(result, recv, recv->klass(), link_info,
1634                            /*check_null_and_abstract=*/true, CHECK);
1635       break;
1636     case Bytecodes::_invokeinterface:
1637       resolve_interface_call(result, recv, recv->klass(), link_info,
1638                              /*check_null_and_abstract=*/true, CHECK);
1639       break;
1640     case Bytecodes::_invokestatic:
1641       resolve_static_call(result, link_info, /*initialize_class=*/false, CHECK);
1642       break;
1643     case Bytecodes::_invokespecial:
1644       resolve_special_call(result, recv, link_info, CHECK);
1645       break;
1646     default:
1647       fatal("bad call: %s", Bytecodes::name(byte));
1648       break;
1649   }
1650 }
1651 
1652 void LinkResolver::resolve_invokestatic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1653   LinkInfo link_info(pool, index, CHECK);
1654   resolve_static_call(result, link_info, /*initialize_class*/true, CHECK);
1655 }
1656 
1657 
1658 void LinkResolver::resolve_invokespecial(CallInfo& result, Handle recv,
1659                                          const constantPoolHandle& pool, int index, TRAPS) {
1660   LinkInfo link_info(pool, index, CHECK);
1661   resolve_special_call(result, recv, link_info, CHECK);
1662 }
1663 
1664 
1665 void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv,
1666                                           const constantPoolHandle& pool, int index,
1667                                           TRAPS) {
1668 
1669   LinkInfo link_info(pool, index, CHECK);
1670   Klass* recvrKlass = recv.is_null() ? (Klass*)NULL : recv->klass();
1671   resolve_virtual_call(result, recv, recvrKlass, link_info, /*check_null_or_abstract*/true, CHECK);
1672 }
1673 
1674 
1675 void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, TRAPS) {
1676   LinkInfo link_info(pool, index, CHECK);
1677   Klass* recvrKlass = recv.is_null() ? (Klass*)NULL : recv->klass();
1678   resolve_interface_call(result, recv, recvrKlass, link_info, true, CHECK);
1679 }
1680 
1681 
1682 void LinkResolver::resolve_invokehandle(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1683   // This guy is reached from InterpreterRuntime::resolve_invokehandle.
1684   LinkInfo link_info(pool, index, CHECK);
1685   if (TraceMethodHandles) {
1686     ResourceMark rm(THREAD);
1687     tty->print_cr("resolve_invokehandle %s %s", link_info.name()->as_C_string(),
1688                   link_info.signature()->as_C_string());
1689   }
1690   resolve_handle_call(result, link_info, CHECK);
1691 }
1692 
1693 void LinkResolver::resolve_handle_call(CallInfo& result,
1694                                        const LinkInfo& link_info,
1695                                        TRAPS) {
1696   // JSR 292:  this must be an implicitly generated method MethodHandle.invokeExact(*...) or similar
1697   Klass* resolved_klass = link_info.resolved_klass();
1698   assert(resolved_klass == SystemDictionary::MethodHandle_klass() ||
1699          resolved_klass == SystemDictionary::VarHandle_klass(), "");
1700   assert(MethodHandles::is_signature_polymorphic_name(link_info.name()), "");
1701   Handle       resolved_appendix;
1702   Handle       resolved_method_type;
1703   methodHandle resolved_method = lookup_polymorphic_method(link_info,
1704                                        &resolved_appendix, &resolved_method_type, CHECK);
1705   result.set_handle(resolved_klass, resolved_method, resolved_appendix, resolved_method_type, CHECK);
1706 }
1707 
1708 void LinkResolver::resolve_invokedynamic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1709   Symbol* method_name       = pool->name_ref_at(index);
1710   Symbol* method_signature  = pool->signature_ref_at(index);
1711   Klass* current_klass = pool->pool_holder();
1712 
1713   // Resolve the bootstrap specifier (BSM + optional arguments).
1714   Handle bootstrap_specifier;
1715   // Check if CallSite has been bound already:
1716   ConstantPoolCacheEntry* cpce = pool->invokedynamic_cp_cache_entry_at(index);
1717   int pool_index = cpce->constant_pool_index();
1718 
1719   if (cpce->is_f1_null()) {
1720     if (cpce->indy_resolution_failed()) {
1721       ConstantPool::throw_resolution_error(pool,
1722                                            ResolutionErrorTable::encode_cpcache_index(index),
1723                                            CHECK);
1724     }
1725 
1726     // The initial step in Call Site Specifier Resolution is to resolve the symbolic
1727     // reference to a method handle which will be the bootstrap method for a dynamic
1728     // call site.  If resolution for the java.lang.invoke.MethodHandle for the bootstrap
1729     // method fails, then a MethodHandleInError is stored at the corresponding bootstrap
1730     // method's CP index for the CONSTANT_MethodHandle_info.  So, there is no need to
1731     // set the indy_rf flag since any subsequent invokedynamic instruction which shares
1732     // this bootstrap method will encounter the resolution of MethodHandleInError.
1733     oop bsm_info = pool->resolve_bootstrap_specifier_at(pool_index, THREAD);
1734     Exceptions::wrap_dynamic_exception(CHECK);
1735     assert(bsm_info != NULL, "");
1736     // FIXME: Cache this once per BootstrapMethods entry, not once per CONSTANT_InvokeDynamic.
1737     bootstrap_specifier = Handle(THREAD, bsm_info);
1738   }
1739   if (!cpce->is_f1_null()) {
1740     methodHandle method(     THREAD, cpce->f1_as_method());
1741     Handle       appendix(   THREAD, cpce->appendix_if_resolved(pool));
1742     Handle       method_type(THREAD, cpce->method_type_if_resolved(pool));
1743     result.set_handle(method, appendix, method_type, THREAD);
1744     Exceptions::wrap_dynamic_exception(CHECK);
1745     return;
1746   }
1747 
1748   if (TraceMethodHandles) {
1749     ResourceMark rm(THREAD);
1750     tty->print_cr("resolve_invokedynamic #%d %s %s in %s",
1751                   ConstantPool::decode_invokedynamic_index(index),
1752                   method_name->as_C_string(), method_signature->as_C_string(),
1753                   current_klass->name()->as_C_string());
1754     tty->print("  BSM info: "); bootstrap_specifier->print();
1755   }
1756 
1757   resolve_dynamic_call(result, pool_index, bootstrap_specifier, method_name,
1758                        method_signature, current_klass, THREAD);
1759   if (HAS_PENDING_EXCEPTION && PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1760     int encoded_index = ResolutionErrorTable::encode_cpcache_index(index);
1761     bool recorded_res_status = cpce->save_and_throw_indy_exc(pool, pool_index,
1762                                                              encoded_index,
1763                                                              pool()->tag_at(pool_index),
1764                                                              CHECK);
1765     if (!recorded_res_status) {
1766       // Another thread got here just before we did.  So, either use the method
1767       // that it resolved or throw the LinkageError exception that it threw.
1768       if (!cpce->is_f1_null()) {
1769         methodHandle method(     THREAD, cpce->f1_as_method());
1770         Handle       appendix(   THREAD, cpce->appendix_if_resolved(pool));
1771         Handle       method_type(THREAD, cpce->method_type_if_resolved(pool));
1772         result.set_handle(method, appendix, method_type, THREAD);
1773         Exceptions::wrap_dynamic_exception(CHECK);
1774       } else {
1775         assert(cpce->indy_resolution_failed(), "Resolution failure flag not set");
1776         ConstantPool::throw_resolution_error(pool, encoded_index, CHECK);
1777       }
1778       return;
1779     }
1780     assert(cpce->indy_resolution_failed(), "Resolution failure flag wasn't set");
1781   }
1782 }
1783 
1784 void LinkResolver::resolve_dynamic_call(CallInfo& result,
1785                                         int pool_index,
1786                                         Handle bootstrap_specifier,
1787                                         Symbol* method_name, Symbol* method_signature,
1788                                         Klass* current_klass,
1789                                         TRAPS) {
1790   // JSR 292:  this must resolve to an implicitly generated method MH.linkToCallSite(*...)
1791   // The appendix argument is likely to be a freshly-created CallSite.
1792   Handle       resolved_appendix;
1793   Handle       resolved_method_type;
1794   methodHandle resolved_method =
1795     SystemDictionary::find_dynamic_call_site_invoker(current_klass,
1796                                                      pool_index,
1797                                                      bootstrap_specifier,
1798                                                      method_name, method_signature,
1799                                                      &resolved_appendix,
1800                                                      &resolved_method_type,
1801                                                      THREAD);
1802   Exceptions::wrap_dynamic_exception(CHECK);
1803   result.set_handle(resolved_method, resolved_appendix, resolved_method_type, THREAD);
1804   Exceptions::wrap_dynamic_exception(CHECK);
1805 }
1806 
1807 // Selected method is abstract.
1808 void LinkResolver::throw_abstract_method_error(const methodHandle& resolved_method,
1809                                                const methodHandle& selected_method,
1810                                                Klass *recv_klass, TRAPS) {
1811   Klass *resolved_klass = resolved_method->method_holder();
1812   ResourceMark rm(THREAD);
1813   stringStream ss;
1814 
1815   if (recv_klass != NULL) {
1816     ss.print("Receiver class %s does not define or inherit an "
1817              "implementation of the",
1818              recv_klass->external_name());
1819   } else {
1820     ss.print("Missing implementation of");
1821   }
1822 
1823   assert(resolved_method.not_null(), "Sanity");
1824   ss.print(" resolved method %s%s%s%s of %s %s.",
1825            resolved_method->is_abstract() ? "abstract " : "",
1826            resolved_method->is_private()  ? "private "  : "",
1827            resolved_method->name()->as_C_string(),
1828            resolved_method->signature()->as_C_string(),
1829            resolved_klass->external_kind(),
1830            resolved_klass->external_name());
1831 
1832   if (selected_method.not_null() && !(resolved_method == selected_method)) {
1833     ss.print(" Selected method is %s%s%s.",
1834              selected_method->is_abstract() ? "abstract " : "",
1835              selected_method->is_private()  ? "private "  : "",
1836              selected_method->name_and_sig_as_C_string());
1837   }
1838 
1839   THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1840 }