1 /*
   2  * Copyright (c) 1997, 2020, 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/compilationPolicy.hpp"
  34 #include "compiler/compileBroker.hpp"
  35 #include "gc/shared/collectedHeap.inline.hpp"
  36 #include "interpreter/bootstrapInfo.hpp"
  37 #include "interpreter/bytecode.hpp"
  38 #include "interpreter/interpreterRuntime.hpp"
  39 #include "interpreter/linkResolver.hpp"
  40 #include "logging/log.hpp"
  41 #include "logging/logStream.hpp"
  42 #include "memory/resourceArea.hpp"
  43 #include "oops/constantPool.hpp"
  44 #include "oops/cpCache.inline.hpp"
  45 #include "oops/instanceKlass.hpp"
  46 #include "oops/method.hpp"
  47 #include "oops/objArrayKlass.hpp"
  48 #include "oops/objArrayOop.hpp"
  49 #include "oops/oop.inline.hpp"
  50 #include "prims/methodHandles.hpp"
  51 #include "prims/nativeLookup.hpp"
  52 #include "runtime/fieldDescriptor.inline.hpp"
  53 #include "runtime/frame.inline.hpp"
  54 #include "runtime/handles.inline.hpp"
  55 #include "runtime/reflection.hpp"
  56 #include "runtime/safepointVerifiers.hpp"
  57 #include "runtime/signature.hpp"
  58 #include "runtime/thread.inline.hpp"
  59 #include "runtime/vmThread.hpp"
  60 
  61 //------------------------------------------------------------------------------------------------------------------------
  62 // Implementation of CallInfo
  63 
  64 
  65 void CallInfo::set_static(Klass* resolved_klass, const methodHandle& resolved_method, TRAPS) {
  66   int vtable_index = Method::nonvirtual_vtable_index;
  67   set_common(resolved_klass, resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK);
  68 }
  69 
  70 
  71 void CallInfo::set_interface(Klass* resolved_klass,
  72                              Klass* selected_klass,
  73                              const methodHandle& resolved_method,
  74                              const methodHandle& selected_method,
  75                              int itable_index, TRAPS) {
  76   // This is only called for interface methods. If the resolved_method
  77   // comes from java/lang/Object, it can be the subject of a virtual call, so
  78   // we should pick the vtable index from the resolved method.
  79   // In that case, the caller must call set_virtual instead of set_interface.
  80   assert(resolved_method->method_holder()->is_interface(), "");
  81   assert(itable_index == resolved_method()->itable_index(), "");
  82   set_common(resolved_klass, selected_klass, resolved_method, selected_method, CallInfo::itable_call, itable_index, CHECK);
  83 }
  84 
  85 void CallInfo::set_virtual(Klass* resolved_klass,
  86                            Klass* selected_klass,
  87                            const methodHandle& resolved_method,
  88                            const methodHandle& selected_method,
  89                            int vtable_index, TRAPS) {
  90   assert(vtable_index >= 0 || vtable_index == Method::nonvirtual_vtable_index, "valid index");
  91   assert(vtable_index < 0 || !resolved_method->has_vtable_index() || vtable_index == resolved_method->vtable_index(), "");
  92   CallKind kind = (vtable_index >= 0 && !resolved_method->can_be_statically_bound() ? CallInfo::vtable_call : CallInfo::direct_call);
  93   set_common(resolved_klass, selected_klass, resolved_method, selected_method, kind, vtable_index, CHECK);
  94   assert(!resolved_method->is_compiled_lambda_form(), "these must be handled via an invokehandle call");
  95 }
  96 
  97 void CallInfo::set_handle(const methodHandle& resolved_method,
  98                           Handle resolved_appendix, TRAPS) {
  99   set_handle(SystemDictionary::MethodHandle_klass(), resolved_method, resolved_appendix, CHECK);
 100 }
 101 
 102 void CallInfo::set_handle(Klass* resolved_klass,
 103                           const methodHandle& resolved_method,
 104                           Handle resolved_appendix, TRAPS) {
 105   guarantee(resolved_method.not_null(), "resolved method is null");
 106   assert(resolved_method->intrinsic_id() == vmIntrinsics::_invokeBasic ||
 107          resolved_method->is_compiled_lambda_form(),
 108          "linkMethod must return one of these");
 109   int vtable_index = Method::nonvirtual_vtable_index;
 110   assert(!resolved_method->has_vtable_index(), "");
 111   set_common(resolved_klass, resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK);
 112   _resolved_appendix = resolved_appendix;
 113 }
 114 
 115 void CallInfo::set_common(Klass* resolved_klass,
 116                           Klass* selected_klass,
 117                           const methodHandle& resolved_method,
 118                           const methodHandle& selected_method,
 119                           CallKind kind,
 120                           int index,
 121                           TRAPS) {
 122   assert(resolved_method->signature() == selected_method->signature(), "signatures must correspond");
 123   _resolved_klass  = resolved_klass;
 124   _selected_klass  = selected_klass;
 125   _resolved_method = resolved_method;
 126   _selected_method = selected_method;
 127   _call_kind       = kind;
 128   _call_index      = index;
 129   _resolved_appendix = Handle();
 130   DEBUG_ONLY(verify());  // verify before making side effects
 131 
 132   CompilationPolicy::compile_if_required(selected_method, THREAD);
 133 }
 134 
 135 // utility query for unreflecting a method
 136 CallInfo::CallInfo(Method* resolved_method, Klass* resolved_klass, TRAPS) {
 137   Klass* resolved_method_holder = resolved_method->method_holder();
 138   if (resolved_klass == NULL) { // 2nd argument defaults to holder of 1st
 139     resolved_klass = resolved_method_holder;
 140   }
 141   _resolved_klass  = resolved_klass;
 142   _selected_klass  = resolved_klass;
 143   _resolved_method = methodHandle(THREAD, resolved_method);
 144   _selected_method = methodHandle(THREAD, resolved_method);
 145   // classify:
 146   CallKind kind = CallInfo::unknown_kind;
 147   int index = resolved_method->vtable_index();
 148   if (resolved_method->can_be_statically_bound()) {
 149     kind = CallInfo::direct_call;
 150   } else if (!resolved_method_holder->is_interface()) {
 151     // Could be an Object method inherited into an interface, but still a vtable call.
 152     kind = CallInfo::vtable_call;
 153   } else if (!resolved_klass->is_interface()) {
 154     // A default or miranda method.  Compute the vtable index.
 155     index = LinkResolver::vtable_index_of_interface_method(resolved_klass,
 156                            _resolved_method);
 157     assert(index >= 0 , "we should have valid vtable index at this point");
 158 
 159     kind = CallInfo::vtable_call;
 160   } else if (resolved_method->has_vtable_index()) {
 161     // Can occur if an interface redeclares a method of Object.
 162 
 163 #ifdef ASSERT
 164     // Ensure that this is really the case.
 165     Klass* object_klass = SystemDictionary::Object_klass();
 166     Method * object_resolved_method = object_klass->vtable().method_at(index);
 167     assert(object_resolved_method->name() == resolved_method->name(),
 168       "Object and interface method names should match at vtable index %d, %s != %s",
 169       index, object_resolved_method->name()->as_C_string(), resolved_method->name()->as_C_string());
 170     assert(object_resolved_method->signature() == resolved_method->signature(),
 171       "Object and interface method signatures should match at vtable index %d, %s != %s",
 172       index, object_resolved_method->signature()->as_C_string(), resolved_method->signature()->as_C_string());
 173 #endif // ASSERT
 174 
 175     kind = CallInfo::vtable_call;
 176   } else {
 177     // A regular interface call.
 178     kind = CallInfo::itable_call;
 179     index = resolved_method->itable_index();
 180   }
 181   assert(index == Method::nonvirtual_vtable_index || index >= 0, "bad index %d", index);
 182   _call_kind  = kind;
 183   _call_index = index;
 184   _resolved_appendix = Handle();
 185   // Find or create a ResolvedMethod instance for this Method*
 186   set_resolved_method_name(CHECK);
 187 
 188   DEBUG_ONLY(verify());
 189 }
 190 
 191 void CallInfo::set_resolved_method_name(TRAPS) {
 192   assert(_resolved_method() != NULL, "Should already have a Method*");
 193   oop rmethod_name = java_lang_invoke_ResolvedMethodName::find_resolved_method(_resolved_method, CHECK);
 194   _resolved_method_name = Handle(THREAD, rmethod_name);
 195 }
 196 
 197 #ifdef ASSERT
 198 void CallInfo::verify() {
 199   switch (call_kind()) {  // the meaning and allowed value of index depends on kind
 200   case CallInfo::direct_call:
 201     if (_call_index == Method::nonvirtual_vtable_index)  break;
 202     // else fall through to check vtable index:
 203   case CallInfo::vtable_call:
 204     assert(resolved_klass()->verify_vtable_index(_call_index), "");
 205     break;
 206   case CallInfo::itable_call:
 207     assert(resolved_method()->method_holder()->verify_itable_index(_call_index), "");
 208     break;
 209   case CallInfo::unknown_kind:
 210     assert(call_kind() != CallInfo::unknown_kind, "CallInfo must be set");
 211     break;
 212   default:
 213     fatal("Unexpected call kind %d", call_kind());
 214   }
 215 }
 216 #endif // ASSERT
 217 
 218 #ifndef PRODUCT
 219 void CallInfo::print() {
 220   ResourceMark rm;
 221   const char* kindstr;
 222   switch (_call_kind) {
 223   case direct_call: kindstr = "direct";  break;
 224   case vtable_call: kindstr = "vtable";  break;
 225   case itable_call: kindstr = "itable";  break;
 226   default         : kindstr = "unknown"; break;
 227   }
 228   tty->print_cr("Call %s@%d %s", kindstr, _call_index,
 229                 _resolved_method.is_null() ? "(none)" : _resolved_method->name_and_sig_as_C_string());
 230 }
 231 #endif
 232 
 233 //------------------------------------------------------------------------------------------------------------------------
 234 // Implementation of LinkInfo
 235 
 236 LinkInfo::LinkInfo(const constantPoolHandle& pool, int index, const methodHandle& current_method, TRAPS) {
 237    // resolve klass
 238   _resolved_klass = pool->klass_ref_at(index, CHECK);
 239 
 240   // Get name, signature, and static klass
 241   _name          = pool->name_ref_at(index);
 242   _signature     = pool->signature_ref_at(index);
 243   _tag           = pool->tag_ref_at(index);
 244   _current_klass = pool->pool_holder();
 245   _current_method = current_method;
 246 
 247   // Coming from the constant pool always checks access
 248   _check_access  = true;
 249 }
 250 
 251 LinkInfo::LinkInfo(const constantPoolHandle& pool, int index, TRAPS) {
 252    // resolve klass
 253   _resolved_klass = pool->klass_ref_at(index, CHECK);
 254 
 255   // Get name, signature, and static klass
 256   _name          = pool->name_ref_at(index);
 257   _signature     = pool->signature_ref_at(index);
 258   _tag           = pool->tag_ref_at(index);
 259   _current_klass = pool->pool_holder();
 260   _current_method = methodHandle();
 261 
 262   // Coming from the constant pool always checks access
 263   _check_access  = true;
 264 }
 265 
 266 #ifndef PRODUCT
 267 void LinkInfo::print() {
 268   ResourceMark rm;
 269   tty->print_cr("Link resolved_klass=%s name=%s signature=%s current_klass=%s check_access=%s",
 270                 _resolved_klass->name()->as_C_string(),
 271                 _name->as_C_string(),
 272                 _signature->as_C_string(),
 273                 _current_klass == NULL ? "(none)" : _current_klass->name()->as_C_string(),
 274                 _check_access ? "true" : "false");
 275 }
 276 #endif // PRODUCT
 277 //------------------------------------------------------------------------------------------------------------------------
 278 // Klass resolution
 279 
 280 void LinkResolver::check_klass_accessability(Klass* ref_klass, Klass* sel_klass,
 281                                              bool fold_type_to_class, TRAPS) {
 282   Klass* base_klass = sel_klass;
 283   if (fold_type_to_class) {
 284     if (sel_klass->is_objArray_klass()) {
 285       base_klass = ObjArrayKlass::cast(sel_klass)->bottom_klass();
 286     }
 287     // The element type could be a typeArray - we only need the access
 288     // check if it is a reference to another class.
 289     if (!base_klass->is_instance_klass()) {
 290       return;  // no relevant check to do
 291     }
 292   }
 293   Reflection::VerifyClassAccessResults vca_result =
 294     Reflection::verify_class_access(ref_klass, InstanceKlass::cast(base_klass), true);
 295   if (vca_result != Reflection::ACCESS_OK) {
 296     ResourceMark rm(THREAD);
 297     char* msg = Reflection::verify_class_access_msg(ref_klass,
 298                                                     InstanceKlass::cast(base_klass),
 299                                                     vca_result);
 300     bool same_module = (base_klass->module() == ref_klass->module());
 301     if (msg == NULL) {
 302       Exceptions::fthrow(
 303         THREAD_AND_LOCATION,
 304         vmSymbols::java_lang_IllegalAccessError(),
 305         "failed to access class %s from class %s (%s%s%s)",
 306         base_klass->external_name(),
 307         ref_klass->external_name(),
 308         (same_module) ? base_klass->joint_in_module_of_loader(ref_klass) : base_klass->class_in_module_of_loader(),
 309         (same_module) ? "" : "; ",
 310         (same_module) ? "" : ref_klass->class_in_module_of_loader());
 311     } else {
 312       // Use module specific message returned by verify_class_access_msg().
 313       Exceptions::fthrow(
 314         THREAD_AND_LOCATION,
 315         vmSymbols::java_lang_IllegalAccessError(),
 316         "%s", msg);
 317     }
 318   }
 319 }
 320 
 321 //------------------------------------------------------------------------------------------------------------------------
 322 // Method resolution
 323 //
 324 // According to JVM spec. $5.4.3c & $5.4.3d
 325 
 326 // Look up method in klasses, including static methods
 327 // Then look up local default methods
 328 Method* LinkResolver::lookup_method_in_klasses(const LinkInfo& link_info,
 329                                                bool checkpolymorphism,
 330                                                bool in_imethod_resolve) {
 331   NoSafepointVerifier nsv;  // Method* returned may not be reclaimed
 332 
 333   Klass* klass = link_info.resolved_klass();
 334   Symbol* name = link_info.name();
 335   Symbol* signature = link_info.signature();
 336 
 337   // Ignore overpasses so statics can be found during resolution
 338   Method* result = klass->uncached_lookup_method(name, signature, Klass::skip_overpass);
 339 
 340   if (klass->is_array_klass()) {
 341     // Only consider klass and super klass for arrays
 342     return result;
 343   }
 344 
 345   InstanceKlass* ik = InstanceKlass::cast(klass);
 346 
 347   // JDK 8, JVMS 5.4.3.4: Interface method resolution should
 348   // ignore static and non-public methods of java.lang.Object,
 349   // like clone, finalize, registerNatives.
 350   if (in_imethod_resolve &&
 351       result != NULL &&
 352       ik->is_interface() &&
 353       (result->is_static() || !result->is_public()) &&
 354       result->method_holder() == SystemDictionary::Object_klass()) {
 355     result = NULL;
 356   }
 357 
 358   // Before considering default methods, check for an overpass in the
 359   // current class if a method has not been found.
 360   if (result == NULL) {
 361     result = ik->find_method(name, signature);
 362   }
 363 
 364   if (result == NULL) {
 365     Array<Method*>* default_methods = ik->default_methods();
 366     if (default_methods != NULL) {
 367       result = InstanceKlass::find_method(default_methods, name, signature);
 368     }
 369   }
 370 
 371   if (checkpolymorphism && result != NULL) {
 372     vmIntrinsics::ID iid = result->intrinsic_id();
 373     if (MethodHandles::is_signature_polymorphic(iid)) {
 374       // Do not link directly to these.  The VM must produce a synthetic one using lookup_polymorphic_method.
 375       return NULL;
 376     }
 377   }
 378   return result;
 379 }
 380 
 381 // returns first instance method
 382 // Looks up method in classes, then looks up local default methods
 383 Method* LinkResolver::lookup_instance_method_in_klasses(Klass* klass,
 384                                                         Symbol* name,
 385                                                         Symbol* signature,
 386                                                         Klass::PrivateLookupMode private_mode, TRAPS) {
 387   Method* result = klass->uncached_lookup_method(name, signature, Klass::find_overpass, private_mode);
 388 
 389   while (result != NULL && result->is_static() && result->method_holder()->super() != NULL) {
 390     Klass* super_klass = result->method_holder()->super();
 391     result = super_klass->uncached_lookup_method(name, signature, Klass::find_overpass, private_mode);
 392   }
 393 
 394   if (klass->is_array_klass()) {
 395     // Only consider klass and super klass for arrays
 396     return result;
 397   }
 398 
 399   if (result == NULL) {
 400     Array<Method*>* default_methods = InstanceKlass::cast(klass)->default_methods();
 401     if (default_methods != NULL) {
 402       result = InstanceKlass::find_method(default_methods, name, signature);
 403       assert(result == NULL || !result->is_static(), "static defaults not allowed");
 404     }
 405   }
 406   return result;
 407 }
 408 
 409 int LinkResolver::vtable_index_of_interface_method(Klass* klass,
 410                                                    const methodHandle& resolved_method) {
 411 
 412   int vtable_index = Method::invalid_vtable_index;
 413   Symbol* name = resolved_method->name();
 414   Symbol* signature = resolved_method->signature();
 415   InstanceKlass* ik = InstanceKlass::cast(klass);
 416 
 417   // First check in default method array
 418   if (!resolved_method->is_abstract() && ik->default_methods() != NULL) {
 419     int index = InstanceKlass::find_method_index(ik->default_methods(),
 420                                                  name, signature, Klass::find_overpass,
 421                                                  Klass::find_static, Klass::find_private);
 422     if (index >= 0 ) {
 423       vtable_index = ik->default_vtable_indices()->at(index);
 424     }
 425   }
 426   if (vtable_index == Method::invalid_vtable_index) {
 427     // get vtable_index for miranda methods
 428     klassVtable vt = ik->vtable();
 429     vtable_index = vt.index_of_miranda(name, signature);
 430   }
 431   return vtable_index;
 432 }
 433 
 434 Method* LinkResolver::lookup_method_in_interfaces(const LinkInfo& cp_info) {
 435   InstanceKlass *ik = InstanceKlass::cast(cp_info.resolved_klass());
 436 
 437   // Specify 'true' in order to skip default methods when searching the
 438   // interfaces.  Function lookup_method_in_klasses() already looked for
 439   // the method in the default methods table.
 440   return ik->lookup_method_in_all_interfaces(cp_info.name(), cp_info.signature(), Klass::skip_defaults);
 441 }
 442 
 443 Method* LinkResolver::lookup_polymorphic_method(const LinkInfo& link_info,
 444                                                 Handle *appendix_result_or_null,
 445                                                 TRAPS) {
 446   Klass* klass = link_info.resolved_klass();
 447   Symbol* name = link_info.name();
 448   Symbol* full_signature = link_info.signature();
 449 
 450   vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name);
 451   if (TraceMethodHandles) {
 452     ResourceMark rm(THREAD);
 453     tty->print_cr("lookup_polymorphic_method iid=%s %s.%s%s",
 454                   vmIntrinsics::name_at(iid), klass->external_name(),
 455                   name->as_C_string(), full_signature->as_C_string());
 456   }
 457   if ((klass == SystemDictionary::MethodHandle_klass() ||
 458        klass == SystemDictionary::VarHandle_klass()) &&
 459       iid != vmIntrinsics::_none) {
 460     if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) {
 461       // Most of these do not need an up-call to Java to resolve, so can be done anywhere.
 462       // Do not erase last argument type (MemberName) if it is a static linkTo method.
 463       bool keep_last_arg = MethodHandles::is_signature_polymorphic_static(iid);
 464       TempNewSymbol basic_signature =
 465         MethodHandles::lookup_basic_type_signature(full_signature, keep_last_arg, CHECK_NULL);
 466       if (TraceMethodHandles) {
 467         ResourceMark rm(THREAD);
 468         tty->print_cr("lookup_polymorphic_method %s %s => basic %s",
 469                       name->as_C_string(),
 470                       full_signature->as_C_string(),
 471                       basic_signature->as_C_string());
 472       }
 473       Method* result = SystemDictionary::find_method_handle_intrinsic(iid,
 474                                                               basic_signature,
 475                                                               CHECK_NULL);
 476       if (result != NULL) {
 477         assert(result->is_method_handle_intrinsic(), "MH.invokeBasic or MH.linkTo* intrinsic");
 478         assert(result->intrinsic_id() != vmIntrinsics::_invokeGeneric, "wrong place to find this");
 479         assert(basic_signature == result->signature(), "predict the result signature");
 480         if (TraceMethodHandles) {
 481           ttyLocker ttyl;
 482           tty->print("lookup_polymorphic_method => intrinsic ");
 483           result->print_on(tty);
 484         }
 485       }
 486       return result;
 487     } else if (iid == vmIntrinsics::_invokeGeneric
 488                && THREAD->can_call_java()
 489                && appendix_result_or_null != NULL) {
 490       // This is a method with type-checking semantics.
 491       // We will ask Java code to spin an adapter method for it.
 492       if (!MethodHandles::enabled()) {
 493         // Make sure the Java part of the runtime has been booted up.
 494         Klass* natives = SystemDictionary::MethodHandleNatives_klass();
 495         if (natives == NULL || InstanceKlass::cast(natives)->is_not_initialized()) {
 496           SystemDictionary::resolve_or_fail(vmSymbols::java_lang_invoke_MethodHandleNatives(),
 497                                             Handle(),
 498                                             Handle(),
 499                                             true,
 500                                             CHECK_NULL);
 501         }
 502       }
 503 
 504       Handle appendix;
 505       Handle method_type;
 506       Method* result = SystemDictionary::find_method_handle_invoker(
 507                                                             klass,
 508                                                             name,
 509                                                             full_signature,
 510                                                             link_info.current_klass(),
 511                                                             &appendix,
 512                                                             CHECK_NULL);
 513       if (TraceMethodHandles) {
 514         ttyLocker ttyl;
 515         tty->print("lookup_polymorphic_method => (via Java) ");
 516         result->print_on(tty);
 517         tty->print("  lookup_polymorphic_method => appendix = ");
 518         if (appendix.is_null())  tty->print_cr("(none)");
 519         else                     appendix->print_on(tty);
 520       }
 521       if (result != NULL) {
 522 #ifdef ASSERT
 523         ResourceMark rm(THREAD);
 524 
 525         TempNewSymbol basic_signature =
 526           MethodHandles::lookup_basic_type_signature(full_signature, CHECK_NULL);
 527         int actual_size_of_params = result->size_of_parameters();
 528         int expected_size_of_params = ArgumentSizeComputer(basic_signature).size();
 529         // +1 for MethodHandle.this, +1 for trailing MethodType
 530         if (!MethodHandles::is_signature_polymorphic_static(iid))  expected_size_of_params += 1;
 531         if (appendix.not_null())                                   expected_size_of_params += 1;
 532         if (actual_size_of_params != expected_size_of_params) {
 533           tty->print_cr("*** basic_signature=%s", basic_signature->as_C_string());
 534           tty->print_cr("*** result for %s: ", vmIntrinsics::name_at(iid));
 535           result->print();
 536         }
 537         assert(actual_size_of_params == expected_size_of_params,
 538                "%d != %d", actual_size_of_params, expected_size_of_params);
 539 #endif //ASSERT
 540 
 541         assert(appendix_result_or_null != NULL, "");
 542         (*appendix_result_or_null) = appendix;
 543       }
 544       return result;
 545     }
 546   }
 547   return NULL;
 548 }
 549 
 550 static void print_nest_host_error_on(stringStream* ss, Klass* ref_klass, Klass* sel_klass, TRAPS) {
 551   assert(ref_klass->is_instance_klass(), "must be");
 552   assert(sel_klass->is_instance_klass(), "must be");
 553   InstanceKlass* ref_ik = InstanceKlass::cast(ref_klass);
 554   InstanceKlass* sel_ik = InstanceKlass::cast(sel_klass);
 555   const char* nest_host_error_1 = ref_ik->nest_host_error(THREAD);
 556   const char* nest_host_error_2 = sel_ik->nest_host_error(THREAD);
 557   if (nest_host_error_1 != NULL || nest_host_error_2 != NULL) {
 558     ss->print(", (%s%s%s)",
 559               (nest_host_error_1 != NULL) ? nest_host_error_1 : "",
 560               (nest_host_error_1 != NULL && nest_host_error_2 != NULL) ? ", " : "",
 561               (nest_host_error_2 != NULL) ? nest_host_error_2 : "");
 562   }
 563 }
 564 
 565 void LinkResolver::check_method_accessability(Klass* ref_klass,
 566                                               Klass* resolved_klass,
 567                                               Klass* sel_klass,
 568                                               const methodHandle& sel_method,
 569                                               TRAPS) {
 570 
 571   AccessFlags flags = sel_method->access_flags();
 572 
 573   // Special case:  arrays always override "clone". JVMS 2.15.
 574   // If the resolved klass is an array class, and the declaring class
 575   // is java.lang.Object and the method is "clone", set the flags
 576   // to public.
 577   //
 578   // We'll check for the method name first, as that's most likely
 579   // to be false (so we'll short-circuit out of these tests).
 580   if (sel_method->name() == vmSymbols::clone_name() &&
 581       sel_klass == SystemDictionary::Object_klass() &&
 582       resolved_klass->is_array_klass()) {
 583     // We need to change "protected" to "public".
 584     assert(flags.is_protected(), "clone not protected?");
 585     jint new_flags = flags.as_int();
 586     new_flags = new_flags & (~JVM_ACC_PROTECTED);
 587     new_flags = new_flags | JVM_ACC_PUBLIC;
 588     flags.set_flags(new_flags);
 589   }
 590 //  assert(extra_arg_result_or_null != NULL, "must be able to return extra argument");
 591 
 592   bool can_access = Reflection::verify_member_access(ref_klass,
 593                                                      resolved_klass,
 594                                                      sel_klass,
 595                                                      flags,
 596                                                      true, false, CHECK);
 597   // Any existing exceptions that may have been thrown
 598   // have been allowed to propagate.
 599   if (!can_access) {
 600     ResourceMark rm(THREAD);
 601     stringStream ss;
 602     bool same_module = (sel_klass->module() == ref_klass->module());
 603     ss.print("class %s tried to access %s%s%smethod '%s' (%s%s%s)",
 604              ref_klass->external_name(),
 605              sel_method->is_abstract()  ? "abstract "  : "",
 606              sel_method->is_protected() ? "protected " : "",
 607              sel_method->is_private()   ? "private "   : "",
 608              sel_method->external_name(),
 609              (same_module) ? ref_klass->joint_in_module_of_loader(sel_klass) : ref_klass->class_in_module_of_loader(),
 610              (same_module) ? "" : "; ",
 611              (same_module) ? "" : sel_klass->class_in_module_of_loader()
 612              );
 613 
 614     // For private access check if there was a problem with nest host
 615     // resolution, and if so report that as part of the message.
 616     if (sel_method->is_private()) {
 617       print_nest_host_error_on(&ss, ref_klass, sel_klass, THREAD);
 618     }
 619 
 620     Exceptions::fthrow(THREAD_AND_LOCATION,
 621                        vmSymbols::java_lang_IllegalAccessError(),
 622                        "%s",
 623                        ss.as_string()
 624                        );
 625     return;
 626   }
 627 }
 628 
 629 Method* LinkResolver::resolve_method_statically(Bytecodes::Code code,
 630                                                 const constantPoolHandle& pool, int index, TRAPS) {
 631   // This method is used only
 632   // (1) in C2 from InlineTree::ok_to_inline (via ciMethod::check_call),
 633   // and
 634   // (2) in Bytecode_invoke::static_target
 635   // It appears to fail when applied to an invokeinterface call site.
 636   // FIXME: Remove this method and ciMethod::check_call; refactor to use the other LinkResolver entry points.
 637   // resolve klass
 638   if (code == Bytecodes::_invokedynamic) {
 639     Klass* resolved_klass = SystemDictionary::MethodHandle_klass();
 640     Symbol* method_name = vmSymbols::invoke_name();
 641     Symbol* method_signature = pool->signature_ref_at(index);
 642     Klass*  current_klass = pool->pool_holder();
 643     LinkInfo link_info(resolved_klass, method_name, method_signature, current_klass);
 644     return resolve_method(link_info, code, THREAD);
 645   }
 646 
 647   LinkInfo link_info(pool, index, methodHandle(), CHECK_NULL);
 648   Klass* resolved_klass = link_info.resolved_klass();
 649 
 650   if (pool->has_preresolution()
 651       || (resolved_klass == SystemDictionary::MethodHandle_klass() &&
 652           MethodHandles::is_signature_polymorphic_name(resolved_klass, link_info.name()))) {
 653     Method* result = ConstantPool::method_at_if_loaded(pool, index);
 654     if (result != NULL) {
 655       return result;
 656     }
 657   }
 658 
 659   if (code == Bytecodes::_invokeinterface) {
 660     return resolve_interface_method(link_info, code, THREAD);
 661   } else if (code == Bytecodes::_invokevirtual) {
 662     return resolve_method(link_info, code, THREAD);
 663   } else if (!resolved_klass->is_interface()) {
 664     return resolve_method(link_info, code, THREAD);
 665   } else {
 666     return resolve_interface_method(link_info, code, THREAD);
 667   }
 668 }
 669 
 670 // Check and print a loader constraint violation message for method or interface method
 671 void LinkResolver::check_method_loader_constraints(const LinkInfo& link_info,
 672                                                    const methodHandle& resolved_method,
 673                                                    const char* method_type, TRAPS) {
 674   Handle current_loader(THREAD, link_info.current_klass()->class_loader());
 675   Handle resolved_loader(THREAD, resolved_method->method_holder()->class_loader());
 676 
 677   ResourceMark rm(THREAD);
 678   Symbol* failed_type_symbol =
 679     SystemDictionary::check_signature_loaders(link_info.signature(), current_loader,
 680                                               resolved_loader, true, CHECK);
 681   if (failed_type_symbol != NULL) {
 682     Klass* current_class = link_info.current_klass();
 683     ClassLoaderData* current_loader_data = current_class->class_loader_data();
 684     assert(current_loader_data != NULL, "current class has no class loader data");
 685     Klass* resolved_method_class = resolved_method->method_holder();
 686     ClassLoaderData* target_loader_data = resolved_method_class->class_loader_data();
 687     assert(target_loader_data != NULL, "resolved method's class has no class loader data");
 688 
 689     stringStream ss;
 690     ss.print("loader constraint violation: when resolving %s '", method_type);
 691     Method::print_external_name(&ss, link_info.resolved_klass(), link_info.name(), link_info.signature());
 692     ss.print("' the class loader %s of the current class, %s,"
 693              " and the class loader %s for the method's defining class, %s, have"
 694              " different Class objects for the type %s used in the signature (%s; %s)",
 695              current_loader_data->loader_name_and_id(),
 696              current_class->name()->as_C_string(),
 697              target_loader_data->loader_name_and_id(),
 698              resolved_method_class->name()->as_C_string(),
 699              failed_type_symbol->as_C_string(),
 700              current_class->class_in_module_of_loader(false, true),
 701              resolved_method_class->class_in_module_of_loader(false, true));
 702     THROW_MSG(vmSymbols::java_lang_LinkageError(), ss.as_string());
 703   }
 704 }
 705 
 706 void LinkResolver::check_field_loader_constraints(Symbol* field, Symbol* sig,
 707                                                   Klass* current_klass,
 708                                                   Klass* sel_klass, TRAPS) {
 709   Handle ref_loader(THREAD, current_klass->class_loader());
 710   Handle sel_loader(THREAD, sel_klass->class_loader());
 711 
 712   ResourceMark rm(THREAD);  // needed for check_signature_loaders
 713   Symbol* failed_type_symbol =
 714     SystemDictionary::check_signature_loaders(sig,
 715                                               ref_loader, sel_loader,
 716                                               false,
 717                                               CHECK);
 718   if (failed_type_symbol != NULL) {
 719     stringStream ss;
 720     const char* failed_type_name = failed_type_symbol->as_klass_external_name();
 721 
 722     ss.print("loader constraint violation: when resolving field \"%s\" of type %s, "
 723              "the class loader %s of the current class, %s, "
 724              "and the class loader %s for the field's defining %s, %s, "
 725              "have different Class objects for type %s (%s; %s)",
 726              field->as_C_string(),
 727              failed_type_name,
 728              current_klass->class_loader_data()->loader_name_and_id(),
 729              current_klass->external_name(),
 730              sel_klass->class_loader_data()->loader_name_and_id(),
 731              sel_klass->external_kind(),
 732              sel_klass->external_name(),
 733              failed_type_name,
 734              current_klass->class_in_module_of_loader(false, true),
 735              sel_klass->class_in_module_of_loader(false, true));
 736     THROW_MSG(vmSymbols::java_lang_LinkageError(), ss.as_string());
 737   }
 738 }
 739 
 740 Method* LinkResolver::resolve_method(const LinkInfo& link_info,
 741                                      Bytecodes::Code code, TRAPS) {
 742 
 743   Handle nested_exception;
 744   Klass* resolved_klass = link_info.resolved_klass();
 745 
 746   // 1. For invokevirtual, cannot call an interface method
 747   if (code == Bytecodes::_invokevirtual && resolved_klass->is_interface()) {
 748     ResourceMark rm(THREAD);
 749     char buf[200];
 750     jio_snprintf(buf, sizeof(buf), "Found interface %s, but class was expected",
 751         resolved_klass->external_name());
 752     THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
 753   }
 754 
 755   // 2. check constant pool tag for called method - must be JVM_CONSTANT_Methodref
 756   if (!link_info.tag().is_invalid() && !link_info.tag().is_method()) {
 757     ResourceMark rm(THREAD);
 758     stringStream ss;
 759     ss.print("Method '");
 760     Method::print_external_name(&ss, link_info.resolved_klass(), link_info.name(), link_info.signature());
 761     ss.print("' must be Methodref constant");
 762     THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
 763   }
 764 
 765   // 3. lookup method in resolved klass and its super klasses
 766   methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, true, false));
 767 
 768   // 4. lookup method in all the interfaces implemented by the resolved klass
 769   if (resolved_method.is_null() && !resolved_klass->is_array_klass()) { // not found in the class hierarchy
 770     resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info));
 771 
 772     if (resolved_method.is_null()) {
 773       // JSR 292:  see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc
 774       Method* method = lookup_polymorphic_method(link_info, (Handle*)NULL, THREAD);
 775       resolved_method = methodHandle(THREAD, method);
 776       if (HAS_PENDING_EXCEPTION) {
 777         nested_exception = Handle(THREAD, PENDING_EXCEPTION);
 778         CLEAR_PENDING_EXCEPTION;
 779       }
 780     }
 781   }
 782 
 783   // 5. method lookup failed
 784   if (resolved_method.is_null()) {
 785     ResourceMark rm(THREAD);
 786     stringStream ss;
 787     ss.print("'");
 788     Method::print_external_name(&ss, resolved_klass, link_info.name(), link_info.signature());
 789     ss.print("'");
 790     THROW_MSG_CAUSE_(vmSymbols::java_lang_NoSuchMethodError(),
 791                      ss.as_string(), nested_exception, NULL);
 792   }
 793 
 794   // 6. access checks, access checking may be turned off when calling from within the VM.
 795   Klass* current_klass = link_info.current_klass();
 796   if (link_info.check_access()) {
 797     assert(current_klass != NULL , "current_klass should not be null");
 798 
 799     // check if method can be accessed by the referring class
 800     check_method_accessability(current_klass,
 801                                resolved_klass,
 802                                resolved_method->method_holder(),
 803                                resolved_method,
 804                                CHECK_NULL);
 805 
 806     // check loader constraints
 807     check_method_loader_constraints(link_info, resolved_method, "method", CHECK_NULL);
 808   }
 809 
 810   return resolved_method();
 811 }
 812 
 813 static void trace_method_resolution(const char* prefix,
 814                                     Klass* klass,
 815                                     Klass* resolved_klass,
 816                                     Method* method,
 817                                     bool logitables,
 818                                     int index = -1) {
 819 #ifndef PRODUCT
 820   ResourceMark rm;
 821   Log(itables) logi;
 822   LogStream lsi(logi.trace());
 823   Log(vtables) logv;
 824   LogStream lsv(logv.trace());
 825   outputStream* st;
 826   if (logitables) {
 827     st = &lsi;
 828   } else {
 829     st = &lsv;
 830   }
 831   st->print("%s%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ",
 832             prefix,
 833             (klass == NULL ? "<NULL>" : klass->internal_name()),
 834             (resolved_klass == NULL ? "<NULL>" : resolved_klass->internal_name()),
 835             Method::name_and_sig_as_C_string(resolved_klass,
 836                                              method->name(),
 837                                              method->signature()),
 838             method->method_holder()->internal_name());
 839   method->print_linkage_flags(st);
 840   if (index != -1) {
 841     st->print("vtable_index:%d", index);
 842   }
 843   st->cr();
 844 #endif // PRODUCT
 845 }
 846 
 847 // Do linktime resolution of a method in the interface within the context of the specied bytecode.
 848 Method* LinkResolver::resolve_interface_method(const LinkInfo& link_info, Bytecodes::Code code, TRAPS) {
 849 
 850   Klass* resolved_klass = link_info.resolved_klass();
 851 
 852   // check if klass is interface
 853   if (!resolved_klass->is_interface()) {
 854     ResourceMark rm(THREAD);
 855     char buf[200];
 856     jio_snprintf(buf, sizeof(buf), "Found class %s, but interface was expected", resolved_klass->external_name());
 857     THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
 858   }
 859 
 860   // check constant pool tag for called method - must be JVM_CONSTANT_InterfaceMethodref
 861   if (!link_info.tag().is_invalid() && !link_info.tag().is_interface_method()) {
 862     ResourceMark rm(THREAD);
 863     stringStream ss;
 864     ss.print("Method '");
 865     Method::print_external_name(&ss, link_info.resolved_klass(), link_info.name(), link_info.signature());
 866     ss.print("' must be InterfaceMethodref constant");
 867     THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
 868   }
 869 
 870   // lookup method in this interface or its super, java.lang.Object
 871   // JDK8: also look for static methods
 872   methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, false, true));
 873 
 874   if (resolved_method.is_null() && !resolved_klass->is_array_klass()) {
 875     // lookup method in all the super-interfaces
 876     resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info));
 877   }
 878 
 879   if (resolved_method.is_null()) {
 880     // no method found
 881     ResourceMark rm(THREAD);
 882     stringStream ss;
 883     ss.print("'");
 884     Method::print_external_name(&ss, resolved_klass, link_info.name(), link_info.signature());
 885     ss.print("'");
 886     THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), ss.as_string());
 887   }
 888 
 889   if (link_info.check_access()) {
 890     // JDK8 adds non-public interface methods, and accessability check requirement
 891     Klass* current_klass = link_info.current_klass();
 892 
 893     assert(current_klass != NULL , "current_klass should not be null");
 894 
 895     // check if method can be accessed by the referring class
 896     check_method_accessability(current_klass,
 897                                resolved_klass,
 898                                resolved_method->method_holder(),
 899                                resolved_method,
 900                                CHECK_NULL);
 901 
 902     check_method_loader_constraints(link_info, resolved_method, "interface method", CHECK_NULL);
 903   }
 904 
 905   if (code != Bytecodes::_invokestatic && resolved_method->is_static()) {
 906     ResourceMark rm(THREAD);
 907     stringStream ss;
 908     ss.print("Expected instance not static method '");
 909     Method::print_external_name(&ss, resolved_klass,
 910                                 resolved_method->name(), resolved_method->signature());
 911     ss.print("'");
 912     THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
 913   }
 914 
 915   if (log_develop_is_enabled(Trace, itables)) {
 916     char buf[200];
 917     jio_snprintf(buf, sizeof(buf), "%s resolved interface method: caller-class:",
 918                  Bytecodes::name(code));
 919     trace_method_resolution(buf, link_info.current_klass(), resolved_klass, resolved_method(), true);
 920   }
 921 
 922   return resolved_method();
 923 }
 924 
 925 //------------------------------------------------------------------------------------------------------------------------
 926 // Field resolution
 927 
 928 void LinkResolver::check_field_accessability(Klass* ref_klass,
 929                                              Klass* resolved_klass,
 930                                              Klass* sel_klass,
 931                                              const fieldDescriptor& fd,
 932                                              TRAPS) {
 933   bool can_access = Reflection::verify_member_access(ref_klass,
 934                                                      resolved_klass,
 935                                                      sel_klass,
 936                                                      fd.access_flags(),
 937                                                      true, false, CHECK);
 938   // Any existing exceptions that may have been thrown, for example LinkageErrors
 939   // from nest-host resolution, have been allowed to propagate.
 940   if (!can_access) {
 941     bool same_module = (sel_klass->module() == ref_klass->module());
 942     ResourceMark rm(THREAD);
 943     stringStream ss;
 944     ss.print("class %s tried to access %s%sfield %s.%s (%s%s%s)",
 945              ref_klass->external_name(),
 946              fd.is_protected() ? "protected " : "",
 947              fd.is_private()   ? "private "   : "",
 948              sel_klass->external_name(),
 949              fd.name()->as_C_string(),
 950              (same_module) ? ref_klass->joint_in_module_of_loader(sel_klass) : ref_klass->class_in_module_of_loader(),
 951              (same_module) ? "" : "; ",
 952              (same_module) ? "" : sel_klass->class_in_module_of_loader()
 953              );
 954     // For private access check if there was a problem with nest host
 955     // resolution, and if so report that as part of the message.
 956     if (fd.is_private()) {
 957       print_nest_host_error_on(&ss, ref_klass, sel_klass, THREAD);
 958     }
 959     Exceptions::fthrow(THREAD_AND_LOCATION,
 960                        vmSymbols::java_lang_IllegalAccessError(),
 961                        "%s",
 962                        ss.as_string()
 963                        );
 964     return;
 965   }
 966 }
 967 
 968 void LinkResolver::resolve_field_access(fieldDescriptor& fd, const constantPoolHandle& pool, int index, const methodHandle& method, Bytecodes::Code byte, TRAPS) {
 969   LinkInfo link_info(pool, index, method, CHECK);
 970   resolve_field(fd, link_info, byte, true, CHECK);
 971 }
 972 
 973 void LinkResolver::resolve_field(fieldDescriptor& fd,
 974                                  const LinkInfo& link_info,
 975                                  Bytecodes::Code byte, bool initialize_class,
 976                                  TRAPS) {
 977   assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic ||
 978          byte == Bytecodes::_getfield  || byte == Bytecodes::_putfield  ||
 979          byte == Bytecodes::_nofast_getfield  || byte == Bytecodes::_nofast_putfield  ||
 980          (byte == Bytecodes::_nop && !link_info.check_access()), "bad field access bytecode");
 981 
 982   bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic);
 983   bool is_put    = (byte == Bytecodes::_putfield  || byte == Bytecodes::_putstatic || byte == Bytecodes::_nofast_putfield);
 984   // Check if there's a resolved klass containing the field
 985   Klass* resolved_klass = link_info.resolved_klass();
 986   Symbol* field = link_info.name();
 987   Symbol* sig = link_info.signature();
 988 
 989   if (resolved_klass == NULL) {
 990     ResourceMark rm(THREAD);
 991     THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
 992   }
 993 
 994   // Resolve instance field
 995   Klass* sel_klass = resolved_klass->find_field(field, sig, &fd);
 996   // check if field exists; i.e., if a klass containing the field def has been selected
 997   if (sel_klass == NULL) {
 998     ResourceMark rm(THREAD);
 999     THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
1000   }
1001 
1002   // Access checking may be turned off when calling from within the VM.
1003   Klass* current_klass = link_info.current_klass();
1004   if (link_info.check_access()) {
1005 
1006     // check access
1007     check_field_accessability(current_klass, resolved_klass, sel_klass, fd, CHECK);
1008 
1009     // check for errors
1010     if (is_static != fd.is_static()) {
1011       ResourceMark rm(THREAD);
1012       char msg[200];
1013       jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string());
1014       THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg);
1015     }
1016 
1017     // A final field can be modified only
1018     // (1) by methods declared in the class declaring the field and
1019     // (2) by the <clinit> method (in case of a static field)
1020     //     or by the <init> method (in case of an instance field).
1021     if (is_put && fd.access_flags().is_final()) {
1022       ResourceMark rm(THREAD);
1023       stringStream ss;
1024 
1025       if (sel_klass != current_klass) {
1026         ss.print("Update to %s final field %s.%s attempted from a different class (%s) than the field's declaring class",
1027                  is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(),
1028                 current_klass->external_name());
1029         THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
1030       }
1031 
1032       if (fd.constants()->pool_holder()->major_version() >= 53) {
1033         Method* m = link_info.current_method();
1034         assert(m != NULL, "information about the current method must be available for 'put' bytecodes");
1035         bool is_initialized_static_final_update = (byte == Bytecodes::_putstatic &&
1036                                                    fd.is_static() &&
1037                                                    !m->is_static_initializer());
1038         bool is_initialized_instance_final_update = ((byte == Bytecodes::_putfield || byte == Bytecodes::_nofast_putfield) &&
1039                                                      !fd.is_static() &&
1040                                                      !m->is_object_initializer());
1041 
1042         if (is_initialized_static_final_update || is_initialized_instance_final_update) {
1043           ss.print("Update to %s final field %s.%s attempted from a different method (%s) than the initializer method %s ",
1044                    is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(),
1045                    m->name()->as_C_string(),
1046                    is_static ? "<clinit>" : "<init>");
1047           THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
1048         }
1049       }
1050     }
1051 
1052     // initialize resolved_klass if necessary
1053     // note 1: the klass which declared the field must be initialized (i.e, sel_klass)
1054     //         according to the newest JVM spec (5.5, p.170) - was bug (gri 7/28/99)
1055     //
1056     // note 2: we don't want to force initialization if we are just checking
1057     //         if the field access is legal; e.g., during compilation
1058     if (is_static && initialize_class) {
1059       sel_klass->initialize(CHECK);
1060     }
1061   }
1062 
1063   if ((sel_klass != current_klass) && (current_klass != NULL)) {
1064     check_field_loader_constraints(field, sig, current_klass, sel_klass, CHECK);
1065   }
1066 
1067   // return information. note that the klass is set to the actual klass containing the
1068   // field, otherwise access of static fields in superclasses will not work.
1069 }
1070 
1071 
1072 //------------------------------------------------------------------------------------------------------------------------
1073 // Invoke resolution
1074 //
1075 // Naming conventions:
1076 //
1077 // resolved_method    the specified method (i.e., static receiver specified via constant pool index)
1078 // sel_method         the selected method  (selected via run-time lookup; e.g., based on dynamic receiver class)
1079 // resolved_klass     the specified klass  (i.e., specified via constant pool index)
1080 // recv_klass         the receiver klass
1081 
1082 
1083 void LinkResolver::resolve_static_call(CallInfo& result,
1084                                        const LinkInfo& link_info,
1085                                        bool initialize_class, TRAPS) {
1086   Method* resolved_method = linktime_resolve_static_method(link_info, CHECK);
1087 
1088   // The resolved class can change as a result of this resolution.
1089   Klass* resolved_klass = resolved_method->method_holder();
1090 
1091   // Initialize klass (this should only happen if everything is ok)
1092   if (initialize_class && resolved_klass->should_be_initialized()) {
1093     resolved_klass->initialize(CHECK);
1094     // Use updated LinkInfo to reresolve with resolved method holder
1095     LinkInfo new_info(resolved_klass, link_info.name(), link_info.signature(),
1096                       link_info.current_klass(),
1097                       link_info.check_access() ? LinkInfo::needs_access_check : LinkInfo::skip_access_check);
1098     resolved_method = linktime_resolve_static_method(new_info, CHECK);
1099   }
1100 
1101   // setup result
1102   result.set_static(resolved_klass, methodHandle(THREAD, resolved_method), CHECK);
1103 }
1104 
1105 // throws linktime exceptions
1106 Method* LinkResolver::linktime_resolve_static_method(const LinkInfo& link_info, TRAPS) {
1107 
1108   Klass* resolved_klass = link_info.resolved_klass();
1109   Method* resolved_method;
1110   if (!resolved_klass->is_interface()) {
1111     resolved_method = resolve_method(link_info, Bytecodes::_invokestatic, CHECK_NULL);
1112   } else {
1113     resolved_method = resolve_interface_method(link_info, Bytecodes::_invokestatic, CHECK_NULL);
1114   }
1115   assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier");
1116 
1117   // check if static
1118   if (!resolved_method->is_static()) {
1119     ResourceMark rm(THREAD);
1120     stringStream ss;
1121     ss.print("Expected static method '");
1122     resolved_method->print_external_name(&ss);
1123     ss.print("'");
1124     THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1125   }
1126   return resolved_method;
1127 }
1128 
1129 
1130 void LinkResolver::resolve_special_call(CallInfo& result,
1131                                         Handle recv,
1132                                         const LinkInfo& link_info,
1133                                         TRAPS) {
1134   Method* resolved_method = linktime_resolve_special_method(link_info, CHECK);
1135   runtime_resolve_special_method(result, link_info, methodHandle(THREAD, resolved_method), recv, CHECK);
1136 }
1137 
1138 // throws linktime exceptions
1139 Method* LinkResolver::linktime_resolve_special_method(const LinkInfo& link_info, TRAPS) {
1140 
1141   // Invokespecial is called for multiple special reasons:
1142   // <init>
1143   // local private method invocation, for classes and interfaces
1144   // superclass.method, which can also resolve to a default method
1145   // and the selected method is recalculated relative to the direct superclass
1146   // superinterface.method, which explicitly does not check shadowing
1147   Klass* resolved_klass = link_info.resolved_klass();
1148   Method* resolved_method;
1149 
1150   if (!resolved_klass->is_interface()) {
1151     resolved_method = resolve_method(link_info, Bytecodes::_invokespecial, CHECK_NULL);
1152   } else {
1153     resolved_method = resolve_interface_method(link_info, Bytecodes::_invokespecial, CHECK_NULL);
1154   }
1155 
1156   // check if method name is <init>, that it is found in same klass as static type
1157   if (resolved_method->name() == vmSymbols::object_initializer_name() &&
1158       resolved_method->method_holder() != resolved_klass) {
1159     ResourceMark rm(THREAD);
1160     stringStream ss;
1161     ss.print("%s: method '", resolved_klass->external_name());
1162     resolved_method->signature()->print_as_signature_external_return_type(&ss);
1163     ss.print(" %s(", resolved_method->name()->as_C_string());
1164     resolved_method->signature()->print_as_signature_external_parameters(&ss);
1165     ss.print(")' not found");
1166     Exceptions::fthrow(
1167       THREAD_AND_LOCATION,
1168       vmSymbols::java_lang_NoSuchMethodError(),
1169       "%s", ss.as_string());
1170     return NULL;
1171   }
1172 
1173   // ensure that invokespecial's interface method reference is in
1174   // a direct superinterface, not an indirect superinterface
1175   Klass* current_klass = link_info.current_klass();
1176   if (current_klass != NULL && resolved_klass->is_interface()) {
1177     InstanceKlass* ck = InstanceKlass::cast(current_klass);
1178     InstanceKlass *klass_to_check = !ck->is_unsafe_anonymous() ?
1179                                     ck :
1180                                     ck->unsafe_anonymous_host();
1181     // Disable verification for the dynamically-generated reflection bytecodes.
1182     bool is_reflect = klass_to_check->is_subclass_of(
1183                         SystemDictionary::reflect_MagicAccessorImpl_klass());
1184 
1185     if (!is_reflect &&
1186         !klass_to_check->is_same_or_direct_interface(resolved_klass)) {
1187       ResourceMark rm(THREAD);
1188       stringStream ss;
1189       ss.print("Interface method reference: '");
1190       resolved_method->print_external_name(&ss);
1191       ss.print("', is in an indirect superinterface of %s",
1192                current_klass->external_name());
1193       THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1194     }
1195   }
1196 
1197   // check if not static
1198   if (resolved_method->is_static()) {
1199     ResourceMark rm(THREAD);
1200     stringStream ss;
1201     ss.print("Expecting non-static method '");
1202     resolved_method->print_external_name(&ss);
1203     ss.print("'");
1204     THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1205   }
1206 
1207   if (log_develop_is_enabled(Trace, itables)) {
1208     trace_method_resolution("invokespecial resolved method: caller-class:",
1209                             current_klass, resolved_klass, resolved_method, true);
1210   }
1211 
1212   return resolved_method;
1213 }
1214 
1215 // throws runtime exceptions
1216 void LinkResolver::runtime_resolve_special_method(CallInfo& result,
1217                                                   const LinkInfo& link_info,
1218                                                   const methodHandle& resolved_method,
1219                                                   Handle recv, TRAPS) {
1220 
1221   Klass* resolved_klass = link_info.resolved_klass();
1222 
1223   // resolved method is selected method unless we have an old-style lookup
1224   // for a superclass method
1225   // Invokespecial for a superinterface, resolved method is selected method,
1226   // no checks for shadowing
1227   methodHandle sel_method(THREAD, resolved_method());
1228 
1229   if (link_info.check_access() &&
1230       // check if the method is not <init>
1231       resolved_method->name() != vmSymbols::object_initializer_name()) {
1232 
1233     Klass* current_klass = link_info.current_klass();
1234 
1235     // Check if the class of the resolved_klass is a superclass
1236     // (not supertype in order to exclude interface classes) of the current class.
1237     // This check is not performed for super.invoke for interface methods
1238     // in super interfaces.
1239     if (current_klass->is_subclass_of(resolved_klass) &&
1240         current_klass != resolved_klass) {
1241       // Lookup super method
1242       Klass* super_klass = current_klass->super();
1243       Method* instance_method = lookup_instance_method_in_klasses(super_klass,
1244                                                      resolved_method->name(),
1245                                                      resolved_method->signature(),
1246                                                      Klass::find_private, CHECK);
1247       sel_method = methodHandle(THREAD, instance_method);
1248 
1249       // check if found
1250       if (sel_method.is_null()) {
1251         ResourceMark rm(THREAD);
1252         stringStream ss;
1253         ss.print("'");
1254         resolved_method->print_external_name(&ss);
1255         ss.print("'");
1256         THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1257       // check loader constraints if found a different method
1258       } else if (sel_method() != resolved_method()) {
1259         check_method_loader_constraints(link_info, sel_method, "method", CHECK);
1260       }
1261     }
1262 
1263     // Check that the class of objectref (the receiver) is the current class or interface,
1264     // or a subtype of the current class or interface (the sender), otherwise invokespecial
1265     // throws IllegalAccessError.
1266     // The verifier checks that the sender is a subtype of the class in the I/MR operand.
1267     // The verifier also checks that the receiver is a subtype of the sender, if the sender is
1268     // a class.  If the sender is an interface, the check has to be performed at runtime.
1269     InstanceKlass* sender = InstanceKlass::cast(current_klass);
1270     sender = sender->is_unsafe_anonymous() ? sender->unsafe_anonymous_host() : sender;
1271     if (sender->is_interface() && recv.not_null()) {
1272       Klass* receiver_klass = recv->klass();
1273       if (!receiver_klass->is_subtype_of(sender)) {
1274         ResourceMark rm(THREAD);
1275         char buf[500];
1276         jio_snprintf(buf, sizeof(buf),
1277                      "Receiver class %s must be the current class or a subtype of interface %s",
1278                      receiver_klass->external_name(),
1279                      sender->external_name());
1280         THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), buf);
1281       }
1282     }
1283   }
1284 
1285   // check if not static
1286   if (sel_method->is_static()) {
1287     ResourceMark rm(THREAD);
1288     stringStream ss;
1289     ss.print("Expecting non-static method '");
1290     resolved_method->print_external_name(&ss);
1291     ss.print("'");
1292     THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1293   }
1294 
1295   // check if abstract
1296   if (sel_method->is_abstract()) {
1297     ResourceMark rm(THREAD);
1298     stringStream ss;
1299     ss.print("'");
1300     Method::print_external_name(&ss, resolved_klass, sel_method->name(), sel_method->signature());
1301     ss.print("'");
1302     THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1303   }
1304 
1305   if (log_develop_is_enabled(Trace, itables)) {
1306     trace_method_resolution("invokespecial selected method: resolved-class:",
1307                             resolved_klass, resolved_klass, sel_method(), true);
1308   }
1309 
1310   // setup result
1311   result.set_static(resolved_klass, sel_method, CHECK);
1312 }
1313 
1314 void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, Klass* receiver_klass,
1315                                         const LinkInfo& link_info,
1316                                         bool check_null_and_abstract, TRAPS) {
1317   Method* resolved_method = linktime_resolve_virtual_method(link_info, CHECK);
1318   runtime_resolve_virtual_method(result, methodHandle(THREAD, resolved_method),
1319                                  link_info.resolved_klass(),
1320                                  recv, receiver_klass,
1321                                  check_null_and_abstract, CHECK);
1322 }
1323 
1324 // throws linktime exceptions
1325 Method* LinkResolver::linktime_resolve_virtual_method(const LinkInfo& link_info,
1326                                                            TRAPS) {
1327   // normal method resolution
1328   Method* resolved_method = resolve_method(link_info, Bytecodes::_invokevirtual, CHECK_NULL);
1329 
1330   assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1331   assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1332 
1333   // check if private interface method
1334   Klass* resolved_klass = link_info.resolved_klass();
1335   Klass* current_klass = link_info.current_klass();
1336 
1337   // This is impossible, if resolve_klass is an interface, we've thrown icce in resolve_method
1338   if (resolved_klass->is_interface() && resolved_method->is_private()) {
1339     ResourceMark rm(THREAD);
1340     stringStream ss;
1341     ss.print("private interface method requires invokespecial, not invokevirtual: method '");
1342     resolved_method->print_external_name(&ss);
1343     ss.print("', caller-class: %s",
1344              (current_klass == NULL ? "<null>" : current_klass->internal_name()));
1345     THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1346   }
1347 
1348   // check if not static
1349   if (resolved_method->is_static()) {
1350     ResourceMark rm(THREAD);
1351     stringStream ss;
1352     ss.print("Expecting non-static method '");
1353     resolved_method->print_external_name(&ss);
1354     ss.print("'");
1355     THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1356   }
1357 
1358   if (log_develop_is_enabled(Trace, vtables)) {
1359     trace_method_resolution("invokevirtual resolved method: caller-class:",
1360                             current_klass, resolved_klass, resolved_method, false);
1361   }
1362 
1363   return resolved_method;
1364 }
1365 
1366 // throws runtime exceptions
1367 void LinkResolver::runtime_resolve_virtual_method(CallInfo& result,
1368                                                   const methodHandle& resolved_method,
1369                                                   Klass* resolved_klass,
1370                                                   Handle recv,
1371                                                   Klass* recv_klass,
1372                                                   bool check_null_and_abstract,
1373                                                   TRAPS) {
1374 
1375   // setup default return values
1376   int vtable_index = Method::invalid_vtable_index;
1377   methodHandle selected_method;
1378 
1379   // runtime method resolution
1380   if (check_null_and_abstract && recv.is_null()) { // check if receiver exists
1381     THROW(vmSymbols::java_lang_NullPointerException());
1382   }
1383 
1384   // Virtual methods cannot be resolved before its klass has been linked, for otherwise the Method*'s
1385   // has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since
1386   // a missing receiver might result in a bogus lookup.
1387   assert(resolved_method->method_holder()->is_linked(), "must be linked");
1388 
1389   // do lookup based on receiver klass using the vtable index
1390   if (resolved_method->method_holder()->is_interface()) { // default or miranda method
1391     vtable_index = vtable_index_of_interface_method(resolved_klass, resolved_method);
1392     assert(vtable_index >= 0 , "we should have valid vtable index at this point");
1393 
1394     selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1395   } else {
1396     // at this point we are sure that resolved_method is virtual and not
1397     // a default or miranda method; therefore, it must have a valid vtable index.
1398     assert(!resolved_method->has_itable_index(), "");
1399     vtable_index = resolved_method->vtable_index();
1400     // We could get a negative vtable_index of nonvirtual_vtable_index for private
1401     // methods, or for final methods. Private methods never appear in the vtable
1402     // and never override other methods. As an optimization, final methods are
1403     // never put in the vtable, unless they override an existing method.
1404     // So if we do get nonvirtual_vtable_index, it means the selected method is the
1405     // resolved method, and it can never be changed by an override.
1406     if (vtable_index == Method::nonvirtual_vtable_index) {
1407       assert(resolved_method->can_be_statically_bound(), "cannot override this method");
1408       selected_method = resolved_method;
1409     } else {
1410       selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1411     }
1412   }
1413 
1414   // check if method exists
1415   if (selected_method.is_null()) {
1416     throw_abstract_method_error(resolved_method, recv_klass, CHECK);
1417   }
1418 
1419   // check if abstract
1420   if (check_null_and_abstract && selected_method->is_abstract()) {
1421     // Pass arguments for generating a verbose error message.
1422     throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK);
1423   }
1424 
1425   if (log_develop_is_enabled(Trace, vtables)) {
1426     trace_method_resolution("invokevirtual selected method: receiver-class:",
1427                             recv_klass, resolved_klass, selected_method(),
1428                             false, vtable_index);
1429   }
1430   // setup result
1431   result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK);
1432 }
1433 
1434 void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, Klass* recv_klass,
1435                                           const LinkInfo& link_info,
1436                                           bool check_null_and_abstract, TRAPS) {
1437   // throws linktime exceptions
1438   Method* resolved_method = linktime_resolve_interface_method(link_info, CHECK);
1439   methodHandle mh(THREAD, resolved_method);
1440   runtime_resolve_interface_method(result, mh, link_info.resolved_klass(),
1441                                    recv, recv_klass, check_null_and_abstract, CHECK);
1442 }
1443 
1444 Method* LinkResolver::linktime_resolve_interface_method(const LinkInfo& link_info,
1445                                                              TRAPS) {
1446   // normal interface method resolution
1447   Method* resolved_method = resolve_interface_method(link_info, Bytecodes::_invokeinterface, CHECK_NULL);
1448   assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1449   assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1450 
1451   return resolved_method;
1452 }
1453 
1454 // throws runtime exceptions
1455 void LinkResolver::runtime_resolve_interface_method(CallInfo& result,
1456                                                     const methodHandle& resolved_method,
1457                                                     Klass* resolved_klass,
1458                                                     Handle recv,
1459                                                     Klass* recv_klass,
1460                                                     bool check_null_and_abstract, TRAPS) {
1461 
1462   // check if receiver exists
1463   if (check_null_and_abstract && recv.is_null()) {
1464     THROW(vmSymbols::java_lang_NullPointerException());
1465   }
1466 
1467   // check if receiver klass implements the resolved interface
1468   if (!recv_klass->is_subtype_of(resolved_klass)) {
1469     ResourceMark rm(THREAD);
1470     char buf[200];
1471     jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s",
1472                  recv_klass->external_name(),
1473                  resolved_klass->external_name());
1474     THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1475   }
1476 
1477   methodHandle selected_method = resolved_method;
1478 
1479   // resolve the method in the receiver class, unless it is private
1480   if (!resolved_method()->is_private()) {
1481     // do lookup based on receiver klass
1482     // This search must match the linktime preparation search for itable initialization
1483     // to correctly enforce loader constraints for interface method inheritance.
1484     // Private methods are skipped as the resolved method was not private.
1485     Method* method = lookup_instance_method_in_klasses(recv_klass,
1486                                                        resolved_method->name(),
1487                                                        resolved_method->signature(),
1488                                                        Klass::skip_private, CHECK);
1489     selected_method = methodHandle(THREAD, method);
1490 
1491     if (selected_method.is_null() && !check_null_and_abstract) {
1492       // In theory this is a harmless placeholder value, but
1493       // in practice leaving in null affects the nsk default method tests.
1494       // This needs further study.
1495       selected_method = resolved_method;
1496     }
1497     // check if method exists
1498     if (selected_method.is_null()) {
1499       // Pass arguments for generating a verbose error message.
1500       throw_abstract_method_error(resolved_method, recv_klass, CHECK);
1501     }
1502     // check access
1503     // Throw Illegal Access Error if selected_method is not public.
1504     if (!selected_method->is_public()) {
1505       ResourceMark rm(THREAD);
1506       stringStream ss;
1507       ss.print("'");
1508       Method::print_external_name(&ss, recv_klass, selected_method->name(), selected_method->signature());
1509       ss.print("'");
1510       THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string());
1511     }
1512     // check if abstract
1513     if (check_null_and_abstract && selected_method->is_abstract()) {
1514       throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK);
1515     }
1516   }
1517 
1518   if (log_develop_is_enabled(Trace, itables)) {
1519     trace_method_resolution("invokeinterface selected method: receiver-class:",
1520                             recv_klass, resolved_klass, selected_method(), true);
1521   }
1522   // setup result
1523   if (resolved_method->has_vtable_index()) {
1524     int vtable_index = resolved_method->vtable_index();
1525     log_develop_trace(itables)("  -- vtable index: %d", vtable_index);
1526     assert(vtable_index == selected_method->vtable_index(), "sanity check");
1527     result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK);
1528   } else if (resolved_method->has_itable_index()) {
1529     int itable_index = resolved_method()->itable_index();
1530     log_develop_trace(itables)("  -- itable index: %d", itable_index);
1531     result.set_interface(resolved_klass, recv_klass, resolved_method, selected_method, itable_index, CHECK);
1532   } else {
1533     int index = resolved_method->vtable_index();
1534     log_develop_trace(itables)("  -- non itable/vtable index: %d", index);
1535     assert(index == Method::nonvirtual_vtable_index, "Oops hit another case!");
1536     assert(resolved_method()->is_private() ||
1537            (resolved_method()->is_final() && resolved_method->method_holder() == SystemDictionary::Object_klass()),
1538            "Should only have non-virtual invokeinterface for private or final-Object methods!");
1539     assert(resolved_method()->can_be_statically_bound(), "Should only have non-virtual invokeinterface for statically bound methods!");
1540     // This sets up the nonvirtual form of "virtual" call (as needed for final and private methods)
1541     result.set_virtual(resolved_klass, resolved_klass, resolved_method, resolved_method, index, CHECK);
1542   }
1543 }
1544 
1545 
1546 Method* LinkResolver::linktime_resolve_interface_method_or_null(
1547                                                  const LinkInfo& link_info) {
1548   EXCEPTION_MARK;
1549   Method* method_result = linktime_resolve_interface_method(link_info, THREAD);
1550   if (HAS_PENDING_EXCEPTION) {
1551     CLEAR_PENDING_EXCEPTION;
1552     return NULL;
1553   } else {
1554     return method_result;
1555   }
1556 }
1557 
1558 Method* LinkResolver::linktime_resolve_virtual_method_or_null(
1559                                                  const LinkInfo& link_info) {
1560   EXCEPTION_MARK;
1561   Method* method_result = linktime_resolve_virtual_method(link_info, THREAD);
1562   if (HAS_PENDING_EXCEPTION) {
1563     CLEAR_PENDING_EXCEPTION;
1564     return NULL;
1565   } else {
1566     return method_result;
1567   }
1568 }
1569 
1570 Method* LinkResolver::resolve_virtual_call_or_null(
1571                                                  Klass* receiver_klass,
1572                                                  const LinkInfo& link_info) {
1573   EXCEPTION_MARK;
1574   CallInfo info;
1575   resolve_virtual_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1576   if (HAS_PENDING_EXCEPTION) {
1577     CLEAR_PENDING_EXCEPTION;
1578     return NULL;
1579   }
1580   return info.selected_method();
1581 }
1582 
1583 Method* LinkResolver::resolve_interface_call_or_null(
1584                                                  Klass* receiver_klass,
1585                                                  const LinkInfo& link_info) {
1586   EXCEPTION_MARK;
1587   CallInfo info;
1588   resolve_interface_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1589   if (HAS_PENDING_EXCEPTION) {
1590     CLEAR_PENDING_EXCEPTION;
1591     return NULL;
1592   }
1593   return info.selected_method();
1594 }
1595 
1596 int LinkResolver::resolve_virtual_vtable_index(Klass* receiver_klass,
1597                                                const LinkInfo& link_info) {
1598   EXCEPTION_MARK;
1599   CallInfo info;
1600   resolve_virtual_call(info, Handle(), receiver_klass, link_info,
1601                        /*check_null_or_abstract*/false, THREAD);
1602   if (HAS_PENDING_EXCEPTION) {
1603     CLEAR_PENDING_EXCEPTION;
1604     return Method::invalid_vtable_index;
1605   }
1606   return info.vtable_index();
1607 }
1608 
1609 Method* LinkResolver::resolve_static_call_or_null(const LinkInfo& link_info) {
1610   EXCEPTION_MARK;
1611   CallInfo info;
1612   resolve_static_call(info, link_info, /*initialize_class*/false, THREAD);
1613   if (HAS_PENDING_EXCEPTION) {
1614     CLEAR_PENDING_EXCEPTION;
1615     return NULL;
1616   }
1617   return info.selected_method();
1618 }
1619 
1620 Method* LinkResolver::resolve_special_call_or_null(const LinkInfo& link_info) {
1621   EXCEPTION_MARK;
1622   CallInfo info;
1623   resolve_special_call(info, Handle(), link_info, THREAD);
1624   if (HAS_PENDING_EXCEPTION) {
1625     CLEAR_PENDING_EXCEPTION;
1626     return NULL;
1627   }
1628   return info.selected_method();
1629 }
1630 
1631 
1632 
1633 //------------------------------------------------------------------------------------------------------------------------
1634 // ConstantPool entries
1635 
1636 void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) {
1637   switch (byte) {
1638     case Bytecodes::_invokestatic   : resolve_invokestatic   (result,       pool, index, CHECK); break;
1639     case Bytecodes::_invokespecial  : resolve_invokespecial  (result, recv, pool, index, CHECK); break;
1640     case Bytecodes::_invokevirtual  : resolve_invokevirtual  (result, recv, pool, index, CHECK); break;
1641     case Bytecodes::_invokehandle   : resolve_invokehandle   (result,       pool, index, CHECK); break;
1642     case Bytecodes::_invokedynamic  : resolve_invokedynamic  (result,       pool, index, CHECK); break;
1643     case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break;
1644     default                         :                                                            break;
1645   }
1646   return;
1647 }
1648 
1649 void LinkResolver::resolve_invoke(CallInfo& result, Handle& recv,
1650                              const methodHandle& attached_method,
1651                              Bytecodes::Code byte, TRAPS) {
1652   Klass* defc = attached_method->method_holder();
1653   Symbol* name = attached_method->name();
1654   Symbol* type = attached_method->signature();
1655   LinkInfo link_info(defc, name, type);
1656   switch(byte) {
1657     case Bytecodes::_invokevirtual:
1658       resolve_virtual_call(result, recv, recv->klass(), link_info,
1659                            /*check_null_and_abstract=*/true, CHECK);
1660       break;
1661     case Bytecodes::_invokeinterface:
1662       resolve_interface_call(result, recv, recv->klass(), link_info,
1663                              /*check_null_and_abstract=*/true, CHECK);
1664       break;
1665     case Bytecodes::_invokestatic:
1666       resolve_static_call(result, link_info, /*initialize_class=*/false, CHECK);
1667       break;
1668     case Bytecodes::_invokespecial:
1669       resolve_special_call(result, recv, link_info, CHECK);
1670       break;
1671     default:
1672       fatal("bad call: %s", Bytecodes::name(byte));
1673       break;
1674   }
1675 }
1676 
1677 void LinkResolver::resolve_invokestatic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1678   LinkInfo link_info(pool, index, CHECK);
1679   resolve_static_call(result, link_info, /*initialize_class*/true, CHECK);
1680 }
1681 
1682 
1683 void LinkResolver::resolve_invokespecial(CallInfo& result, Handle recv,
1684                                          const constantPoolHandle& pool, int index, TRAPS) {
1685   LinkInfo link_info(pool, index, CHECK);
1686   resolve_special_call(result, recv, link_info, CHECK);
1687 }
1688 
1689 
1690 void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv,
1691                                           const constantPoolHandle& pool, int index,
1692                                           TRAPS) {
1693 
1694   LinkInfo link_info(pool, index, CHECK);
1695   Klass* recvrKlass = recv.is_null() ? (Klass*)NULL : recv->klass();
1696   resolve_virtual_call(result, recv, recvrKlass, link_info, /*check_null_or_abstract*/true, CHECK);
1697 }
1698 
1699 
1700 void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, TRAPS) {
1701   LinkInfo link_info(pool, index, CHECK);
1702   Klass* recvrKlass = recv.is_null() ? (Klass*)NULL : recv->klass();
1703   resolve_interface_call(result, recv, recvrKlass, link_info, true, CHECK);
1704 }
1705 
1706 
1707 void LinkResolver::resolve_invokehandle(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1708   // This guy is reached from InterpreterRuntime::resolve_invokehandle.
1709   LinkInfo link_info(pool, index, CHECK);
1710   if (TraceMethodHandles) {
1711     ResourceMark rm(THREAD);
1712     tty->print_cr("resolve_invokehandle %s %s", link_info.name()->as_C_string(),
1713                   link_info.signature()->as_C_string());
1714   }
1715   resolve_handle_call(result, link_info, CHECK);
1716 }
1717 
1718 void LinkResolver::resolve_handle_call(CallInfo& result,
1719                                        const LinkInfo& link_info,
1720                                        TRAPS) {
1721   // JSR 292:  this must be an implicitly generated method MethodHandle.invokeExact(*...) or similar
1722   Klass* resolved_klass = link_info.resolved_klass();
1723   assert(resolved_klass == SystemDictionary::MethodHandle_klass() ||
1724          resolved_klass == SystemDictionary::VarHandle_klass(), "");
1725   assert(MethodHandles::is_signature_polymorphic_name(link_info.name()), "");
1726   Handle       resolved_appendix;
1727   Method* resolved_method = lookup_polymorphic_method(link_info, &resolved_appendix, CHECK);
1728   result.set_handle(resolved_klass, methodHandle(THREAD, resolved_method), resolved_appendix, CHECK);
1729 }
1730 
1731 void LinkResolver::resolve_invokedynamic(CallInfo& result, const constantPoolHandle& pool, int indy_index, TRAPS) {
1732   ConstantPoolCacheEntry* cpce = pool->invokedynamic_cp_cache_entry_at(indy_index);
1733   int pool_index = cpce->constant_pool_index();
1734 
1735   // Resolve the bootstrap specifier (BSM + optional arguments).
1736   BootstrapInfo bootstrap_specifier(pool, pool_index, indy_index);
1737 
1738   // Check if CallSite has been bound already or failed already, and short circuit:
1739   {
1740     bool is_done = bootstrap_specifier.resolve_previously_linked_invokedynamic(result, CHECK);
1741     if (is_done) return;
1742   }
1743 
1744   // The initial step in Call Site Specifier Resolution is to resolve the symbolic
1745   // reference to a method handle which will be the bootstrap method for a dynamic
1746   // call site.  If resolution for the java.lang.invoke.MethodHandle for the bootstrap
1747   // method fails, then a MethodHandleInError is stored at the corresponding bootstrap
1748   // method's CP index for the CONSTANT_MethodHandle_info.  So, there is no need to
1749   // set the indy_rf flag since any subsequent invokedynamic instruction which shares
1750   // this bootstrap method will encounter the resolution of MethodHandleInError.
1751 
1752   resolve_dynamic_call(result, bootstrap_specifier, CHECK);
1753 
1754   if (TraceMethodHandles) {
1755     bootstrap_specifier.print_msg_on(tty, "resolve_invokedynamic");
1756   }
1757 
1758   // The returned linkage result is provisional up to the moment
1759   // the interpreter or runtime performs a serialized check of
1760   // the relevant CPCE::f1 field.  This is done by the caller
1761   // of this method, via CPCE::set_dynamic_call, which uses
1762   // an ObjectLocker to do the final serialization of updates
1763   // to CPCE state, including f1.
1764 }
1765 
1766 void LinkResolver::resolve_dynamic_call(CallInfo& result,
1767                                         BootstrapInfo& bootstrap_specifier,
1768                                         TRAPS) {
1769   // JSR 292:  this must resolve to an implicitly generated method
1770   // such as MH.linkToCallSite(*...) or some other call-site shape.
1771   // The appendix argument is likely to be a freshly-created CallSite.
1772   // It may also be a MethodHandle from an unwrapped ConstantCallSite,
1773   // or any other reference.  The resolved_method as well as the appendix
1774   // are both recorded together via CallInfo::set_handle.
1775   SystemDictionary::invoke_bootstrap_method(bootstrap_specifier, THREAD);
1776   Exceptions::wrap_dynamic_exception(THREAD);
1777 
1778   if (HAS_PENDING_EXCEPTION) {
1779     if (!PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1780       // Let any random low-level IE or SOE or OOME just bleed through.
1781       // Basically we pretend that the bootstrap method was never called,
1782       // if it fails this way:  We neither record a successful linkage,
1783       // nor do we memorize a LE for posterity.
1784       return;
1785     }
1786     // JVMS 5.4.3 says: If an attempt by the Java Virtual Machine to resolve
1787     // a symbolic reference fails because an error is thrown that is an
1788     // instance of LinkageError (or a subclass), then subsequent attempts to
1789     // resolve the reference always fail with the same error that was thrown
1790     // as a result of the initial resolution attempt.
1791      bool recorded_res_status = bootstrap_specifier.save_and_throw_indy_exc(CHECK);
1792      if (!recorded_res_status) {
1793        // Another thread got here just before we did.  So, either use the method
1794        // that it resolved or throw the LinkageError exception that it threw.
1795        bool is_done = bootstrap_specifier.resolve_previously_linked_invokedynamic(result, CHECK);
1796        if (is_done) return;
1797      }
1798      assert(bootstrap_specifier.invokedynamic_cp_cache_entry()->indy_resolution_failed(),
1799             "Resolution failure flag wasn't set");
1800   }
1801 
1802   bootstrap_specifier.resolve_newly_linked_invokedynamic(result, CHECK);
1803   // Exceptions::wrap_dynamic_exception not used because
1804   // set_handle doesn't throw linkage errors
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",
1825            resolved_method->is_abstract() ? "abstract " : "",
1826            resolved_method->is_private()  ? "private "  : "");
1827   resolved_method->signature()->print_as_signature_external_return_type(&ss);
1828   ss.print(" %s(", resolved_method->name()->as_C_string());
1829   resolved_method->signature()->print_as_signature_external_parameters(&ss);
1830   ss.print(")' of %s %s.",
1831            resolved_klass->external_kind(),
1832            resolved_klass->external_name());
1833 
1834   if (selected_method.not_null() && !(resolved_method == selected_method)) {
1835     ss.print(" Selected method is '%s%s",
1836              selected_method->is_abstract() ? "abstract " : "",
1837              selected_method->is_private()  ? "private "  : "");
1838     selected_method->print_external_name(&ss);
1839     ss.print("'.");
1840   }
1841 
1842   THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1843 }