1 /*
   2  * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "classfile/systemDictionary.hpp"
  27 #include "classfile/vmSymbols.hpp"
  28 #include "compiler/compileBroker.hpp"
  29 #include "gc_interface/collectedHeap.inline.hpp"
  30 #include "interpreter/bytecode.hpp"
  31 #include "interpreter/interpreterRuntime.hpp"
  32 #include "interpreter/linkResolver.hpp"
  33 #include "memory/resourceArea.hpp"
  34 #include "memory/universe.inline.hpp"
  35 #include "oops/instanceKlass.hpp"
  36 #include "oops/objArrayOop.hpp"
  37 #include "prims/methodHandles.hpp"
  38 #include "prims/nativeLookup.hpp"
  39 #include "runtime/compilationPolicy.hpp"
  40 #include "runtime/fieldDescriptor.hpp"
  41 #include "runtime/frame.inline.hpp"
  42 #include "runtime/handles.inline.hpp"
  43 #include "runtime/reflection.hpp"
  44 #include "runtime/signature.hpp"
  45 #include "runtime/vmThread.hpp"
  46 #ifdef TARGET_OS_FAMILY_linux
  47 # include "thread_linux.inline.hpp"
  48 #endif
  49 #ifdef TARGET_OS_FAMILY_solaris
  50 # include "thread_solaris.inline.hpp"
  51 #endif
  52 #ifdef TARGET_OS_FAMILY_windows
  53 # include "thread_windows.inline.hpp"
  54 #endif
  55 
  56 //------------------------------------------------------------------------------------------------------------------------
  57 // Implementation of FieldAccessInfo
  58 
  59 void FieldAccessInfo::set(KlassHandle klass, symbolHandle name, int field_index, int field_offset,
  60 BasicType field_type, AccessFlags access_flags) {
  61   _klass        = klass;
  62   _name         = name;
  63   _field_index  = field_index;
  64   _field_offset = field_offset;
  65   _field_type   = field_type;
  66   _access_flags = access_flags;
  67 }
  68 
  69 
  70 //------------------------------------------------------------------------------------------------------------------------
  71 // Implementation of CallInfo
  72 
  73 
  74 void CallInfo::set_static(KlassHandle resolved_klass, methodHandle resolved_method, TRAPS) {
  75   int vtable_index = methodOopDesc::nonvirtual_vtable_index;
  76   set_common(resolved_klass, resolved_klass, resolved_method, resolved_method, vtable_index, CHECK);
  77 }
  78 
  79 
  80 void CallInfo::set_interface(KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method, TRAPS) {
  81   // This is only called for interface methods. If the resolved_method
  82   // comes from java/lang/Object, it can be the subject of a virtual call, so
  83   // we should pick the vtable index from the resolved method.
  84   // Other than that case, there is no valid vtable index to specify.
  85   int vtable_index = methodOopDesc::invalid_vtable_index;
  86   if (resolved_method->method_holder() == SystemDictionary::Object_klass()) {
  87     assert(resolved_method->vtable_index() == selected_method->vtable_index(), "sanity check");
  88     vtable_index = resolved_method->vtable_index();
  89   }
  90   set_common(resolved_klass, selected_klass, resolved_method, selected_method, vtable_index, CHECK);
  91 }
  92 
  93 void CallInfo::set_virtual(KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method, int vtable_index, TRAPS) {
  94   assert(vtable_index >= 0 || vtable_index == methodOopDesc::nonvirtual_vtable_index, "valid index");
  95   set_common(resolved_klass, selected_klass, resolved_method, selected_method, vtable_index, CHECK);
  96 }
  97 
  98 void CallInfo::set_dynamic(methodHandle resolved_method, TRAPS) {
  99   assert(resolved_method->is_method_handle_invoke(), "");
 100   KlassHandle resolved_klass = SystemDictionaryHandles::MethodHandle_klass();
 101   assert(resolved_klass == resolved_method->method_holder(), "");
 102   int vtable_index = methodOopDesc::nonvirtual_vtable_index;
 103   assert(resolved_method->vtable_index() == vtable_index, "");
 104   set_common(resolved_klass, KlassHandle(), resolved_method, resolved_method, vtable_index, CHECK);
 105 }
 106 
 107 void CallInfo::set_common(KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method, int vtable_index, TRAPS) {
 108   assert(resolved_method->signature() == selected_method->signature(), "signatures must correspond");
 109   _resolved_klass  = resolved_klass;
 110   _selected_klass  = selected_klass;
 111   _resolved_method = resolved_method;
 112   _selected_method = selected_method;
 113   _vtable_index    = vtable_index;
 114   if (CompilationPolicy::must_be_compiled(selected_method)) {
 115     // This path is unusual, mostly used by the '-Xcomp' stress test mode.
 116 
 117     // Note: with several active threads, the must_be_compiled may be true
 118     //       while can_be_compiled is false; remove assert
 119     // assert(CompilationPolicy::can_be_compiled(selected_method), "cannot compile");
 120     if (THREAD->is_Compiler_thread()) {
 121       // don't force compilation, resolve was on behalf of compiler
 122       return;
 123     }
 124     if (instanceKlass::cast(selected_method->method_holder())->is_not_initialized()) {
 125       // 'is_not_initialized' means not only '!is_initialized', but also that
 126       // initialization has not been started yet ('!being_initialized')
 127       // Do not force compilation of methods in uninitialized classes.
 128       // Note that doing this would throw an assert later,
 129       // in CompileBroker::compile_method.
 130       // We sometimes use the link resolver to do reflective lookups
 131       // even before classes are initialized.
 132       return;
 133     }
 134     CompileBroker::compile_method(selected_method, InvocationEntryBci,
 135                                   CompLevel_initial_compile,
 136                                   methodHandle(), 0, "must_be_compiled", CHECK);
 137   }
 138 }
 139 
 140 
 141 //------------------------------------------------------------------------------------------------------------------------
 142 // Klass resolution
 143 
 144 void LinkResolver::check_klass_accessability(KlassHandle ref_klass, KlassHandle sel_klass, TRAPS) {
 145   if (!Reflection::verify_class_access(ref_klass->as_klassOop(),
 146                                        sel_klass->as_klassOop(),
 147                                        true)) {
 148     ResourceMark rm(THREAD);
 149     Exceptions::fthrow(
 150       THREAD_AND_LOCATION,
 151       vmSymbolHandles::java_lang_IllegalAccessError(),
 152       "tried to access class %s from class %s",
 153       sel_klass->external_name(),
 154       ref_klass->external_name()
 155     );
 156     return;
 157   }
 158 }
 159 
 160 void LinkResolver::resolve_klass(KlassHandle& result, constantPoolHandle pool, int index, TRAPS) {
 161   klassOop result_oop = pool->klass_ref_at(index, CHECK);
 162   result = KlassHandle(THREAD, result_oop);
 163 }
 164 
 165 void LinkResolver::resolve_klass_no_update(KlassHandle& result, constantPoolHandle pool, int index, TRAPS) {
 166   klassOop result_oop =
 167          constantPoolOopDesc::klass_ref_at_if_loaded_check(pool, index, CHECK);
 168   result = KlassHandle(THREAD, result_oop);
 169 }
 170 
 171 
 172 //------------------------------------------------------------------------------------------------------------------------
 173 // Method resolution
 174 //
 175 // According to JVM spec. $5.4.3c & $5.4.3d
 176 
 177 void LinkResolver::lookup_method_in_klasses(methodHandle& result, KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS) {
 178   methodOop result_oop = klass->uncached_lookup_method(name(), signature());
 179   if (EnableMethodHandles && result_oop != NULL) {
 180     switch (result_oop->intrinsic_id()) {
 181     case vmIntrinsics::_invokeExact:
 182     case vmIntrinsics::_invokeGeneric:
 183     case vmIntrinsics::_invokeDynamic:
 184       // Do not link directly to these.  The VM must produce a synthetic one using lookup_implicit_method.
 185       return;
 186     }
 187   }
 188   result = methodHandle(THREAD, result_oop);
 189 }
 190 
 191 // returns first instance method
 192 void LinkResolver::lookup_instance_method_in_klasses(methodHandle& result, KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS) {
 193   methodOop result_oop = klass->uncached_lookup_method(name(), signature());
 194   result = methodHandle(THREAD, result_oop);
 195   while (!result.is_null() && result->is_static()) {
 196     klass = KlassHandle(THREAD, Klass::cast(result->method_holder())->super());
 197     result = methodHandle(THREAD, klass->uncached_lookup_method(name(), signature()));
 198   }
 199 }
 200 
 201 
 202 int LinkResolver::vtable_index_of_miranda_method(KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS) {
 203   ResourceMark rm(THREAD);
 204   klassVtable *vt = instanceKlass::cast(klass())->vtable();
 205   return vt->index_of_miranda(name(), signature());
 206 }
 207 
 208 void LinkResolver::lookup_method_in_interfaces(methodHandle& result, KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS) {
 209   instanceKlass *ik = instanceKlass::cast(klass());
 210   result = methodHandle(THREAD, ik->lookup_method_in_all_interfaces(name(), signature()));
 211 }
 212 
 213 void LinkResolver::lookup_implicit_method(methodHandle& result,
 214                                           KlassHandle klass, symbolHandle name, symbolHandle signature,
 215                                           KlassHandle current_klass,
 216                                           TRAPS) {
 217   if (EnableMethodHandles &&
 218       klass() == SystemDictionary::MethodHandle_klass() &&
 219       methodOopDesc::is_method_handle_invoke_name(name())) {
 220     if (!MethodHandles::enabled()) {
 221       // Make sure the Java part of the runtime has been booted up.
 222       klassOop natives = SystemDictionary::MethodHandleNatives_klass();
 223       if (natives == NULL || instanceKlass::cast(natives)->is_not_initialized()) {
 224         SystemDictionary::resolve_or_fail(vmSymbolHandles::sun_dyn_MethodHandleNatives(),
 225                                           Handle(),
 226                                           Handle(),
 227                                           true,
 228                                           CHECK);
 229       }
 230     }
 231     methodOop result_oop = SystemDictionary::find_method_handle_invoke(name,
 232                                                                        signature,
 233                                                                        current_klass,
 234                                                                        CHECK);
 235     if (result_oop != NULL) {
 236       assert(result_oop->is_method_handle_invoke() && result_oop->signature() == signature(), "consistent");
 237       result = methodHandle(THREAD, result_oop);
 238     }
 239   }
 240 }
 241 
 242 void LinkResolver::check_method_accessability(KlassHandle ref_klass,
 243                                               KlassHandle resolved_klass,
 244                                               KlassHandle sel_klass,
 245                                               methodHandle sel_method,
 246                                               TRAPS) {
 247 
 248   AccessFlags flags = sel_method->access_flags();
 249 
 250   // Special case:  arrays always override "clone". JVMS 2.15.
 251   // If the resolved klass is an array class, and the declaring class
 252   // is java.lang.Object and the method is "clone", set the flags
 253   // to public.
 254   //
 255   // We'll check for the method name first, as that's most likely
 256   // to be false (so we'll short-circuit out of these tests).
 257   if (sel_method->name() == vmSymbols::clone_name() &&
 258       sel_klass() == SystemDictionary::Object_klass() &&
 259       resolved_klass->oop_is_array()) {
 260     // We need to change "protected" to "public".
 261     assert(flags.is_protected(), "clone not protected?");
 262     jint new_flags = flags.as_int();
 263     new_flags = new_flags & (~JVM_ACC_PROTECTED);
 264     new_flags = new_flags | JVM_ACC_PUBLIC;
 265     flags.set_flags(new_flags);
 266   }
 267 
 268   if (!Reflection::verify_field_access(ref_klass->as_klassOop(),
 269                                        resolved_klass->as_klassOop(),
 270                                        sel_klass->as_klassOop(),
 271                                        flags,
 272                                        true)) {
 273     ResourceMark rm(THREAD);
 274     Exceptions::fthrow(
 275       THREAD_AND_LOCATION,
 276       vmSymbolHandles::java_lang_IllegalAccessError(),
 277       "tried to access method %s.%s%s from class %s",
 278       sel_klass->external_name(),
 279       sel_method->name()->as_C_string(),
 280       sel_method->signature()->as_C_string(),
 281       ref_klass->external_name()
 282     );
 283     return;
 284   }
 285 }
 286 
 287 void LinkResolver::resolve_method(methodHandle& resolved_method, KlassHandle& resolved_klass,
 288                                   constantPoolHandle pool, int index, TRAPS) {
 289 
 290   // resolve klass
 291   resolve_klass(resolved_klass, pool, index, CHECK);
 292 
 293   symbolHandle method_name      (THREAD, pool->name_ref_at(index));
 294   symbolHandle method_signature (THREAD, pool->signature_ref_at(index));
 295   KlassHandle  current_klass(THREAD, pool->pool_holder());
 296 
 297   resolve_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, true, CHECK);
 298 }
 299 
 300 void LinkResolver::resolve_dynamic_method(methodHandle& resolved_method, KlassHandle& resolved_klass, constantPoolHandle pool, int index, TRAPS) {
 301   // The class is java.dyn.MethodHandle
 302   resolved_klass = SystemDictionaryHandles::MethodHandle_klass();
 303 
 304   symbolHandle method_name = vmSymbolHandles::invokeExact_name();
 305 
 306   symbolHandle method_signature(THREAD, pool->signature_ref_at(index));
 307   KlassHandle  current_klass   (THREAD, pool->pool_holder());
 308 
 309   resolve_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, true, CHECK);
 310 }
 311 
 312 void LinkResolver::resolve_interface_method(methodHandle& resolved_method, KlassHandle& resolved_klass, constantPoolHandle pool, int index, TRAPS) {
 313 
 314   // resolve klass
 315   resolve_klass(resolved_klass, pool, index, CHECK);
 316   symbolHandle method_name      (THREAD, pool->name_ref_at(index));
 317   symbolHandle method_signature (THREAD, pool->signature_ref_at(index));
 318   KlassHandle  current_klass(THREAD, pool->pool_holder());
 319 
 320   resolve_interface_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, true, CHECK);
 321 }
 322 
 323 
 324 void LinkResolver::resolve_method(methodHandle& resolved_method, KlassHandle resolved_klass,
 325                                   symbolHandle method_name, symbolHandle method_signature,
 326                                   KlassHandle current_klass, bool check_access, TRAPS) {
 327 
 328   // 1. check if klass is not interface
 329   if (resolved_klass->is_interface()) {
 330     char buf[200];
 331     jio_snprintf(buf, sizeof(buf), "Found interface %s, but class was expected", Klass::cast(resolved_klass())->external_name());
 332     THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
 333   }
 334 
 335   // 2. lookup method in resolved klass and its super klasses
 336   lookup_method_in_klasses(resolved_method, resolved_klass, method_name, method_signature, CHECK);
 337 
 338   if (resolved_method.is_null()) { // not found in the class hierarchy
 339     // 3. lookup method in all the interfaces implemented by the resolved klass
 340     lookup_method_in_interfaces(resolved_method, resolved_klass, method_name, method_signature, CHECK);
 341 
 342     if (resolved_method.is_null()) {
 343       // JSR 292:  see if this is an implicitly generated method MethodHandle.invoke(*...)
 344       lookup_implicit_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, CHECK);
 345     }
 346 
 347     if (resolved_method.is_null()) {
 348       // 4. method lookup failed
 349       ResourceMark rm(THREAD);
 350       THROW_MSG(vmSymbols::java_lang_NoSuchMethodError(),
 351                 methodOopDesc::name_and_sig_as_C_string(Klass::cast(resolved_klass()),
 352                                                         method_name(),
 353                                                         method_signature()));
 354     }
 355   }
 356 
 357   // 5. check if method is concrete
 358   if (resolved_method->is_abstract() && !resolved_klass->is_abstract()) {
 359     ResourceMark rm(THREAD);
 360     THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
 361               methodOopDesc::name_and_sig_as_C_string(Klass::cast(resolved_klass()),
 362                                                       method_name(),
 363                                                       method_signature()));
 364   }
 365 
 366   // 6. access checks, access checking may be turned off when calling from within the VM.
 367   if (check_access) {
 368     assert(current_klass.not_null() , "current_klass should not be null");
 369 
 370     // check if method can be accessed by the referring class
 371     check_method_accessability(current_klass,
 372                                resolved_klass,
 373                                KlassHandle(THREAD, resolved_method->method_holder()),
 374                                resolved_method,
 375                                CHECK);
 376 
 377     // check loader constraints
 378     Handle loader (THREAD, instanceKlass::cast(current_klass())->class_loader());
 379     Handle class_loader (THREAD, instanceKlass::cast(resolved_method->method_holder())->class_loader());
 380     {
 381       ResourceMark rm(THREAD);
 382       char* failed_type_name =
 383         SystemDictionary::check_signature_loaders(method_signature, loader,
 384                                                   class_loader, true, CHECK);
 385       if (failed_type_name != NULL) {
 386         const char* msg = "loader constraint violation: when resolving method"
 387           " \"%s\" the class loader (instance of %s) of the current class, %s,"
 388           " and the class loader (instance of %s) for resolved class, %s, have"
 389           " different Class objects for the type %s used in the signature";
 390         char* sig = methodOopDesc::name_and_sig_as_C_string(Klass::cast(resolved_klass()),method_name(),method_signature());
 391         const char* loader1 = SystemDictionary::loader_name(loader());
 392         char* current = instanceKlass::cast(current_klass())->name()->as_C_string();
 393         const char* loader2 = SystemDictionary::loader_name(class_loader());
 394         char* resolved = instanceKlass::cast(resolved_klass())->name()->as_C_string();
 395         size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1) +
 396           strlen(current) + strlen(loader2) + strlen(resolved) +
 397           strlen(failed_type_name);
 398         char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen);
 399         jio_snprintf(buf, buflen, msg, sig, loader1, current, loader2,
 400                      resolved, failed_type_name);
 401         THROW_MSG(vmSymbols::java_lang_LinkageError(), buf);
 402       }
 403     }
 404   }
 405 }
 406 
 407 void LinkResolver::resolve_interface_method(methodHandle& resolved_method,
 408                                             KlassHandle resolved_klass,
 409                                             symbolHandle method_name,
 410                                             symbolHandle method_signature,
 411                                             KlassHandle current_klass,
 412                                             bool check_access, TRAPS) {
 413 
 414  // check if klass is interface
 415   if (!resolved_klass->is_interface()) {
 416     char buf[200];
 417     jio_snprintf(buf, sizeof(buf), "Found class %s, but interface was expected", Klass::cast(resolved_klass())->external_name());
 418     THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
 419   }
 420 
 421   // lookup method in this interface or its super, java.lang.Object
 422   lookup_instance_method_in_klasses(resolved_method, resolved_klass, method_name, method_signature, CHECK);
 423 
 424   if (resolved_method.is_null()) {
 425     // lookup method in all the super-interfaces
 426     lookup_method_in_interfaces(resolved_method, resolved_klass, method_name, method_signature, CHECK);
 427     if (resolved_method.is_null()) {
 428       // no method found
 429       ResourceMark rm(THREAD);
 430       THROW_MSG(vmSymbols::java_lang_NoSuchMethodError(),
 431                 methodOopDesc::name_and_sig_as_C_string(Klass::cast(resolved_klass()),
 432                                                         method_name(),
 433                                                         method_signature()));
 434     }
 435   }
 436 
 437   if (check_access) {
 438     HandleMark hm(THREAD);
 439     Handle loader (THREAD, instanceKlass::cast(current_klass())->class_loader());
 440     Handle class_loader (THREAD, instanceKlass::cast(resolved_method->method_holder())->class_loader());
 441     {
 442       ResourceMark rm(THREAD);
 443       char* failed_type_name =
 444         SystemDictionary::check_signature_loaders(method_signature, loader,
 445                                                   class_loader, true, CHECK);
 446       if (failed_type_name != NULL) {
 447         const char* msg = "loader constraint violation: when resolving "
 448           "interface method \"%s\" the class loader (instance of %s) of the "
 449           "current class, %s, and the class loader (instance of %s) for "
 450           "resolved class, %s, have different Class objects for the type %s "
 451           "used in the signature";
 452         char* sig = methodOopDesc::name_and_sig_as_C_string(Klass::cast(resolved_klass()),method_name(),method_signature());
 453         const char* loader1 = SystemDictionary::loader_name(loader());
 454         char* current = instanceKlass::cast(current_klass())->name()->as_C_string();
 455         const char* loader2 = SystemDictionary::loader_name(class_loader());
 456         char* resolved = instanceKlass::cast(resolved_klass())->name()->as_C_string();
 457         size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1) +
 458           strlen(current) + strlen(loader2) + strlen(resolved) +
 459           strlen(failed_type_name);
 460         char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen);
 461         jio_snprintf(buf, buflen, msg, sig, loader1, current, loader2,
 462                      resolved, failed_type_name);
 463         THROW_MSG(vmSymbols::java_lang_LinkageError(), buf);
 464       }
 465     }
 466   }
 467 }
 468 
 469 //------------------------------------------------------------------------------------------------------------------------
 470 // Field resolution
 471 
 472 void LinkResolver::check_field_accessability(KlassHandle ref_klass,
 473                                              KlassHandle resolved_klass,
 474                                              KlassHandle sel_klass,
 475                                              fieldDescriptor& fd,
 476                                              TRAPS) {
 477   if (!Reflection::verify_field_access(ref_klass->as_klassOop(),
 478                                        resolved_klass->as_klassOop(),
 479                                        sel_klass->as_klassOop(),
 480                                        fd.access_flags(),
 481                                        true)) {
 482     ResourceMark rm(THREAD);
 483     Exceptions::fthrow(
 484       THREAD_AND_LOCATION,
 485       vmSymbolHandles::java_lang_IllegalAccessError(),
 486       "tried to access field %s.%s from class %s",
 487       sel_klass->external_name(),
 488       fd.name()->as_C_string(),
 489       ref_klass->external_name()
 490     );
 491     return;
 492   }
 493 }
 494 
 495 void LinkResolver::resolve_field(FieldAccessInfo& result, constantPoolHandle pool, int index, Bytecodes::Code byte, bool check_only, TRAPS) {
 496   resolve_field(result, pool, index, byte, check_only, true, CHECK);
 497 }
 498 
 499 void LinkResolver::resolve_field(FieldAccessInfo& result, constantPoolHandle pool, int index, Bytecodes::Code byte, bool check_only, bool update_pool, TRAPS) {
 500   assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic ||
 501          byte == Bytecodes::_getfield  || byte == Bytecodes::_putfield, "bad bytecode");
 502 
 503   bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic);
 504   bool is_put    = (byte == Bytecodes::_putfield  || byte == Bytecodes::_putstatic);
 505 
 506   // resolve specified klass
 507   KlassHandle resolved_klass;
 508   if (update_pool) {
 509     resolve_klass(resolved_klass, pool, index, CHECK);
 510   } else {
 511     resolve_klass_no_update(resolved_klass, pool, index, CHECK);
 512   }
 513   // Load these early in case the resolve of the containing klass fails
 514   symbolOop field = pool->name_ref_at(index);
 515   symbolHandle field_h (THREAD, field); // preserve in case we need the name
 516   symbolOop sig   = pool->signature_ref_at(index);
 517   // Check if there's a resolved klass containing the field
 518   if( resolved_klass.is_null() ) {
 519     ResourceMark rm(THREAD);
 520     THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
 521   }
 522 
 523   // Resolve instance field
 524   fieldDescriptor fd; // find_field initializes fd if found
 525   KlassHandle sel_klass(THREAD, instanceKlass::cast(resolved_klass())->find_field(field, sig, &fd));
 526   // check if field exists; i.e., if a klass containing the field def has been selected
 527   if (sel_klass.is_null()){
 528     ResourceMark rm(THREAD);
 529     THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
 530   }
 531 
 532   // check access
 533   KlassHandle ref_klass(THREAD, pool->pool_holder());
 534   check_field_accessability(ref_klass, resolved_klass, sel_klass, fd, CHECK);
 535 
 536   // check for errors
 537   if (is_static != fd.is_static()) {
 538     char msg[200];
 539     jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", Klass::cast(resolved_klass())->external_name(), fd.name()->as_C_string());
 540     THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg);
 541   }
 542 
 543   // Final fields can only be accessed from its own class.
 544   if (is_put && fd.access_flags().is_final() && sel_klass() != pool->pool_holder()) {
 545     THROW(vmSymbols::java_lang_IllegalAccessError());
 546   }
 547 
 548   // initialize resolved_klass if necessary
 549   // note 1: the klass which declared the field must be initialized (i.e, sel_klass)
 550   //         according to the newest JVM spec (5.5, p.170) - was bug (gri 7/28/99)
 551   //
 552   // note 2: we don't want to force initialization if we are just checking
 553   //         if the field access is legal; e.g., during compilation
 554   if (is_static && !check_only) {
 555     sel_klass->initialize(CHECK);
 556   }
 557 
 558   {
 559     HandleMark hm(THREAD);
 560     Handle ref_loader (THREAD, instanceKlass::cast(ref_klass())->class_loader());
 561     Handle sel_loader (THREAD, instanceKlass::cast(sel_klass())->class_loader());
 562     symbolHandle signature_ref (THREAD, pool->signature_ref_at(index));
 563     {
 564       ResourceMark rm(THREAD);
 565       char* failed_type_name =
 566         SystemDictionary::check_signature_loaders(signature_ref,
 567                                                   ref_loader, sel_loader,
 568                                                   false,
 569                                                   CHECK);
 570       if (failed_type_name != NULL) {
 571         const char* msg = "loader constraint violation: when resolving field"
 572           " \"%s\" the class loader (instance of %s) of the referring class, "
 573           "%s, and the class loader (instance of %s) for the field's resolved "
 574           "type, %s, have different Class objects for that type";
 575         char* field_name = field_h()->as_C_string();
 576         const char* loader1 = SystemDictionary::loader_name(ref_loader());
 577         char* sel = instanceKlass::cast(sel_klass())->name()->as_C_string();
 578         const char* loader2 = SystemDictionary::loader_name(sel_loader());
 579         size_t buflen = strlen(msg) + strlen(field_name) + strlen(loader1) +
 580           strlen(sel) + strlen(loader2) + strlen(failed_type_name);
 581         char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen);
 582         jio_snprintf(buf, buflen, msg, field_name, loader1, sel, loader2,
 583                      failed_type_name);
 584         THROW_MSG(vmSymbols::java_lang_LinkageError(), buf);
 585       }
 586     }
 587   }
 588 
 589   // return information. note that the klass is set to the actual klass containing the
 590   // field, otherwise access of static fields in superclasses will not work.
 591   KlassHandle holder (THREAD, fd.field_holder());
 592   symbolHandle name  (THREAD, fd.name());
 593   result.set(holder, name, fd.index(), fd.offset(), fd.field_type(), fd.access_flags());
 594 }
 595 
 596 
 597 //------------------------------------------------------------------------------------------------------------------------
 598 // Invoke resolution
 599 //
 600 // Naming conventions:
 601 //
 602 // resolved_method    the specified method (i.e., static receiver specified via constant pool index)
 603 // sel_method         the selected method  (selected via run-time lookup; e.g., based on dynamic receiver class)
 604 // resolved_klass     the specified klass  (i.e., specified via constant pool index)
 605 // recv_klass         the receiver klass
 606 
 607 
 608 void LinkResolver::resolve_static_call(CallInfo& result, KlassHandle& resolved_klass, symbolHandle method_name,
 609                                        symbolHandle method_signature, KlassHandle current_klass,
 610                                        bool check_access, bool initialize_class, TRAPS) {
 611   methodHandle resolved_method;
 612   linktime_resolve_static_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK);
 613   resolved_klass = KlassHandle(THREAD, Klass::cast(resolved_method->method_holder()));
 614 
 615   // Initialize klass (this should only happen if everything is ok)
 616   if (initialize_class && resolved_klass->should_be_initialized()) {
 617     resolved_klass->initialize(CHECK);
 618     linktime_resolve_static_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK);
 619   }
 620 
 621   // setup result
 622   result.set_static(resolved_klass, resolved_method, CHECK);
 623 }
 624 
 625 // throws linktime exceptions
 626 void LinkResolver::linktime_resolve_static_method(methodHandle& resolved_method, KlassHandle resolved_klass,
 627                                                   symbolHandle method_name, symbolHandle method_signature,
 628                                                   KlassHandle current_klass, bool check_access, TRAPS) {
 629 
 630   resolve_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK);
 631   assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier");
 632 
 633   // check if static
 634   if (!resolved_method->is_static()) {
 635     char buf[200];
 636     jio_snprintf(buf, sizeof(buf), "Expected static method %s", methodOopDesc::name_and_sig_as_C_string(Klass::cast(resolved_klass()),
 637                                                       resolved_method->name(),
 638                                                       resolved_method->signature()));
 639     THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
 640   }
 641 }
 642 
 643 
 644 void LinkResolver::resolve_special_call(CallInfo& result, KlassHandle resolved_klass, symbolHandle method_name,
 645                                         symbolHandle method_signature, KlassHandle current_klass, bool check_access, TRAPS) {
 646   methodHandle resolved_method;
 647   linktime_resolve_special_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK);
 648   runtime_resolve_special_method(result, resolved_method, resolved_klass, current_klass, check_access, CHECK);
 649 }
 650 
 651 // throws linktime exceptions
 652 void LinkResolver::linktime_resolve_special_method(methodHandle& resolved_method, KlassHandle resolved_klass,
 653                                                    symbolHandle method_name, symbolHandle method_signature,
 654                                                    KlassHandle current_klass, bool check_access, TRAPS) {
 655 
 656   resolve_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK);
 657 
 658   // check if method name is <init>, that it is found in same klass as static type
 659   if (resolved_method->name() == vmSymbols::object_initializer_name() &&
 660       resolved_method->method_holder() != resolved_klass()) {
 661     ResourceMark rm(THREAD);
 662     Exceptions::fthrow(
 663       THREAD_AND_LOCATION,
 664       vmSymbolHandles::java_lang_NoSuchMethodError(),
 665       "%s: method %s%s not found",
 666       resolved_klass->external_name(),
 667       resolved_method->name()->as_C_string(),
 668       resolved_method->signature()->as_C_string()
 669     );
 670     return;
 671   }
 672 
 673   // check if not static
 674   if (resolved_method->is_static()) {
 675     char buf[200];
 676     jio_snprintf(buf, sizeof(buf),
 677                  "Expecting non-static method %s",
 678                  methodOopDesc::name_and_sig_as_C_string(Klass::cast(resolved_klass()),
 679                                                          resolved_method->name(),
 680                                                          resolved_method->signature()));
 681     THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
 682   }
 683 }
 684 
 685 // throws runtime exceptions
 686 void LinkResolver::runtime_resolve_special_method(CallInfo& result, methodHandle resolved_method, KlassHandle resolved_klass,
 687                                                   KlassHandle current_klass, bool check_access, TRAPS) {
 688 
 689   // resolved method is selected method unless we have an old-style lookup
 690   methodHandle sel_method(THREAD, resolved_method());
 691 
 692   // check if this is an old-style super call and do a new lookup if so
 693   { KlassHandle method_klass  = KlassHandle(THREAD,
 694                                             resolved_method->method_holder());
 695 
 696     if (check_access &&
 697         // a) check if ACC_SUPER flag is set for the current class
 698         current_klass->is_super() &&
 699         // b) check if the method class is a superclass of the current class (superclass relation is not reflexive!)
 700         current_klass->is_subtype_of(method_klass()) && current_klass() != method_klass() &&
 701         // c) check if the method is not <init>
 702         resolved_method->name() != vmSymbols::object_initializer_name()) {
 703       // Lookup super method
 704       KlassHandle super_klass(THREAD, current_klass->super());
 705       lookup_instance_method_in_klasses(sel_method, super_klass,
 706                            symbolHandle(THREAD, resolved_method->name()),
 707                            symbolHandle(THREAD, resolved_method->signature()), CHECK);
 708       // check if found
 709       if (sel_method.is_null()) {
 710         ResourceMark rm(THREAD);
 711         THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
 712                   methodOopDesc::name_and_sig_as_C_string(Klass::cast(resolved_klass()),
 713                                             resolved_method->name(),
 714                                             resolved_method->signature()));
 715       }
 716     }
 717   }
 718 
 719   // check if not static
 720   if (sel_method->is_static()) {
 721     char buf[200];
 722     jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", methodOopDesc::name_and_sig_as_C_string(Klass::cast(resolved_klass()),
 723                                                                                                              resolved_method->name(),
 724                                                                                                              resolved_method->signature()));
 725     THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
 726   }
 727 
 728   // check if abstract
 729   if (sel_method->is_abstract()) {
 730     ResourceMark rm(THREAD);
 731     THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
 732               methodOopDesc::name_and_sig_as_C_string(Klass::cast(resolved_klass()),
 733                                                       sel_method->name(),
 734                                                       sel_method->signature()));
 735   }
 736 
 737   // setup result
 738   result.set_static(resolved_klass, sel_method, CHECK);
 739 }
 740 
 741 void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, KlassHandle receiver_klass, KlassHandle resolved_klass,
 742                                         symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass,
 743                                         bool check_access, bool check_null_and_abstract, TRAPS) {
 744   methodHandle resolved_method;
 745   linktime_resolve_virtual_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK);
 746   runtime_resolve_virtual_method(result, resolved_method, resolved_klass, recv, receiver_klass, check_null_and_abstract, CHECK);
 747 }
 748 
 749 // throws linktime exceptions
 750 void LinkResolver::linktime_resolve_virtual_method(methodHandle &resolved_method, KlassHandle resolved_klass,
 751                                                    symbolHandle method_name, symbolHandle method_signature,
 752                                                    KlassHandle current_klass, bool check_access, TRAPS) {
 753   // normal method resolution
 754   resolve_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK);
 755 
 756   assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
 757   assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
 758 
 759   // check if not static
 760   if (resolved_method->is_static()) {
 761     char buf[200];
 762     jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", methodOopDesc::name_and_sig_as_C_string(Klass::cast(resolved_klass()),
 763                                                                                                              resolved_method->name(),
 764                                                                                                              resolved_method->signature()));
 765     THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
 766   }
 767 }
 768 
 769 // throws runtime exceptions
 770 void LinkResolver::runtime_resolve_virtual_method(CallInfo& result,
 771                                                   methodHandle resolved_method,
 772                                                   KlassHandle resolved_klass,
 773                                                   Handle recv,
 774                                                   KlassHandle recv_klass,
 775                                                   bool check_null_and_abstract,
 776                                                   TRAPS) {
 777 
 778   // setup default return values
 779   int vtable_index = methodOopDesc::invalid_vtable_index;
 780   methodHandle selected_method;
 781 
 782   assert(recv.is_null() || recv->is_oop(), "receiver is not an oop");
 783 
 784   // runtime method resolution
 785   if (check_null_and_abstract && recv.is_null()) { // check if receiver exists
 786     THROW(vmSymbols::java_lang_NullPointerException());
 787   }
 788 
 789   // Virtual methods cannot be resolved before its klass has been linked, for otherwise the methodOop's
 790   // has not been rewritten, and the vtable initialized.
 791   assert(instanceKlass::cast(resolved_method->method_holder())->is_linked(), "must be linked");
 792 
 793   // Virtual methods cannot be resolved before its klass has been linked, for otherwise the methodOop's
 794   // has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since
 795   // a missing receiver might result in a bogus lookup.
 796   assert(instanceKlass::cast(resolved_method->method_holder())->is_linked(), "must be linked");
 797 
 798   // do lookup based on receiver klass using the vtable index
 799   if (resolved_method->method_holder()->klass_part()->is_interface()) { // miranda method
 800     vtable_index = vtable_index_of_miranda_method(resolved_klass,
 801                            symbolHandle(THREAD, resolved_method->name()),
 802                            symbolHandle(THREAD, resolved_method->signature()), CHECK);
 803     assert(vtable_index >= 0 , "we should have valid vtable index at this point");
 804 
 805     instanceKlass* inst = instanceKlass::cast(recv_klass());
 806     selected_method = methodHandle(THREAD, inst->method_at_vtable(vtable_index));
 807   } else {
 808     // at this point we are sure that resolved_method is virtual and not
 809     // a miranda method; therefore, it must have a valid vtable index.
 810     vtable_index = resolved_method->vtable_index();
 811     // We could get a negative vtable_index for final methods,
 812     // because as an optimization they are they are never put in the vtable,
 813     // unless they override an existing method.
 814     // If we do get a negative, it means the resolved method is the the selected
 815     // method, and it can never be changed by an override.
 816     if (vtable_index == methodOopDesc::nonvirtual_vtable_index) {
 817       assert(resolved_method->can_be_statically_bound(), "cannot override this method");
 818       selected_method = resolved_method;
 819     } else {
 820       // recv_klass might be an arrayKlassOop but all vtables start at
 821       // the same place. The cast is to avoid virtual call and assertion.
 822       instanceKlass* inst = (instanceKlass*)recv_klass()->klass_part();
 823       selected_method = methodHandle(THREAD, inst->method_at_vtable(vtable_index));
 824     }
 825   }
 826 
 827   // check if method exists
 828   if (selected_method.is_null()) {
 829     ResourceMark rm(THREAD);
 830     THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
 831               methodOopDesc::name_and_sig_as_C_string(Klass::cast(resolved_klass()),
 832                                                       resolved_method->name(),
 833                                                       resolved_method->signature()));
 834   }
 835 
 836   // check if abstract
 837   if (check_null_and_abstract && selected_method->is_abstract()) {
 838     ResourceMark rm(THREAD);
 839     THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
 840               methodOopDesc::name_and_sig_as_C_string(Klass::cast(resolved_klass()),
 841                                                       selected_method->name(),
 842                                                       selected_method->signature()));
 843   }
 844 
 845   // setup result
 846   result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK);
 847 }
 848 
 849 void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, KlassHandle recv_klass, KlassHandle resolved_klass,
 850                                           symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass,
 851                                           bool check_access, bool check_null_and_abstract, TRAPS) {
 852   methodHandle resolved_method;
 853   linktime_resolve_interface_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK);
 854   runtime_resolve_interface_method(result, resolved_method, resolved_klass, recv, recv_klass, check_null_and_abstract, CHECK);
 855 }
 856 
 857 // throws linktime exceptions
 858 void LinkResolver::linktime_resolve_interface_method(methodHandle& resolved_method, KlassHandle resolved_klass, symbolHandle method_name,
 859                                                      symbolHandle method_signature, KlassHandle current_klass, bool check_access, TRAPS) {
 860   // normal interface method resolution
 861   resolve_interface_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK);
 862 
 863   assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
 864   assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
 865 }
 866 
 867 // throws runtime exceptions
 868 void LinkResolver::runtime_resolve_interface_method(CallInfo& result, methodHandle resolved_method, KlassHandle resolved_klass,
 869                                                     Handle recv, KlassHandle recv_klass, bool check_null_and_abstract, TRAPS) {
 870   // check if receiver exists
 871   if (check_null_and_abstract && recv.is_null()) {
 872     THROW(vmSymbols::java_lang_NullPointerException());
 873   }
 874 
 875   // check if receiver klass implements the resolved interface
 876   if (!recv_klass->is_subtype_of(resolved_klass())) {
 877     char buf[200];
 878     jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s",
 879                  (Klass::cast(recv_klass()))->external_name(),
 880                  (Klass::cast(resolved_klass()))->external_name());
 881     THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
 882   }
 883   // do lookup based on receiver klass
 884   methodHandle sel_method;
 885   lookup_instance_method_in_klasses(sel_method, recv_klass,
 886             symbolHandle(THREAD, resolved_method->name()),
 887             symbolHandle(THREAD, resolved_method->signature()), CHECK);
 888   // check if method exists
 889   if (sel_method.is_null()) {
 890     ResourceMark rm(THREAD);
 891     THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
 892               methodOopDesc::name_and_sig_as_C_string(Klass::cast(recv_klass()),
 893                                                       resolved_method->name(),
 894                                                       resolved_method->signature()));
 895   }
 896   // check if public
 897   if (!sel_method->is_public()) {
 898     ResourceMark rm(THREAD);
 899     THROW_MSG(vmSymbols::java_lang_IllegalAccessError(),
 900               methodOopDesc::name_and_sig_as_C_string(Klass::cast(recv_klass()),
 901                                                       sel_method->name(),
 902                                                       sel_method->signature()));
 903   }
 904   // check if abstract
 905   if (check_null_and_abstract && sel_method->is_abstract()) {
 906     ResourceMark rm(THREAD);
 907     THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
 908               methodOopDesc::name_and_sig_as_C_string(Klass::cast(recv_klass()),
 909                                                       sel_method->name(),
 910                                                       sel_method->signature()));
 911   }
 912   // setup result
 913   result.set_interface(resolved_klass, recv_klass, resolved_method, sel_method, CHECK);
 914 }
 915 
 916 
 917 methodHandle LinkResolver::linktime_resolve_interface_method_or_null(
 918                                                  KlassHandle resolved_klass,
 919                                                  symbolHandle method_name,
 920                                                  symbolHandle method_signature,
 921                                                  KlassHandle current_klass,
 922                                                  bool check_access) {
 923   EXCEPTION_MARK;
 924   methodHandle method_result;
 925   linktime_resolve_interface_method(method_result, resolved_klass, method_name, method_signature, current_klass, check_access, THREAD);
 926   if (HAS_PENDING_EXCEPTION) {
 927     CLEAR_PENDING_EXCEPTION;
 928     return methodHandle();
 929   } else {
 930     return method_result;
 931   }
 932 }
 933 
 934 methodHandle LinkResolver::linktime_resolve_virtual_method_or_null(
 935                                                  KlassHandle resolved_klass,
 936                                                  symbolHandle method_name,
 937                                                  symbolHandle method_signature,
 938                                                  KlassHandle current_klass,
 939                                                  bool check_access) {
 940   EXCEPTION_MARK;
 941   methodHandle method_result;
 942   linktime_resolve_virtual_method(method_result, resolved_klass, method_name, method_signature, current_klass, check_access, THREAD);
 943   if (HAS_PENDING_EXCEPTION) {
 944     CLEAR_PENDING_EXCEPTION;
 945     return methodHandle();
 946   } else {
 947     return method_result;
 948   }
 949 }
 950 
 951 methodHandle LinkResolver::resolve_virtual_call_or_null(
 952                                                  KlassHandle receiver_klass,
 953                                                  KlassHandle resolved_klass,
 954                                                  symbolHandle name,
 955                                                  symbolHandle signature,
 956                                                  KlassHandle current_klass) {
 957   EXCEPTION_MARK;
 958   CallInfo info;
 959   resolve_virtual_call(info, Handle(), receiver_klass, resolved_klass, name, signature, current_klass, true, false, THREAD);
 960   if (HAS_PENDING_EXCEPTION) {
 961     CLEAR_PENDING_EXCEPTION;
 962     return methodHandle();
 963   }
 964   return info.selected_method();
 965 }
 966 
 967 methodHandle LinkResolver::resolve_interface_call_or_null(
 968                                                  KlassHandle receiver_klass,
 969                                                  KlassHandle resolved_klass,
 970                                                  symbolHandle name,
 971                                                  symbolHandle signature,
 972                                                  KlassHandle current_klass) {
 973   EXCEPTION_MARK;
 974   CallInfo info;
 975   resolve_interface_call(info, Handle(), receiver_klass, resolved_klass, name, signature, current_klass, true, false, THREAD);
 976   if (HAS_PENDING_EXCEPTION) {
 977     CLEAR_PENDING_EXCEPTION;
 978     return methodHandle();
 979   }
 980   return info.selected_method();
 981 }
 982 
 983 int LinkResolver::resolve_virtual_vtable_index(
 984                                                KlassHandle receiver_klass,
 985                                                KlassHandle resolved_klass,
 986                                                symbolHandle name,
 987                                                symbolHandle signature,
 988                                                KlassHandle current_klass) {
 989   EXCEPTION_MARK;
 990   CallInfo info;
 991   resolve_virtual_call(info, Handle(), receiver_klass, resolved_klass, name, signature, current_klass, true, false, THREAD);
 992   if (HAS_PENDING_EXCEPTION) {
 993     CLEAR_PENDING_EXCEPTION;
 994     return methodOopDesc::invalid_vtable_index;
 995   }
 996   return info.vtable_index();
 997 }
 998 
 999 methodHandle LinkResolver::resolve_static_call_or_null(
1000                                                   KlassHandle resolved_klass,
1001                                                   symbolHandle name,
1002                                                   symbolHandle signature,
1003                                                   KlassHandle current_klass) {
1004   EXCEPTION_MARK;
1005   CallInfo info;
1006   resolve_static_call(info, resolved_klass, name, signature, current_klass, true, false, THREAD);
1007   if (HAS_PENDING_EXCEPTION) {
1008     CLEAR_PENDING_EXCEPTION;
1009     return methodHandle();
1010   }
1011   return info.selected_method();
1012 }
1013 
1014 methodHandle LinkResolver::resolve_special_call_or_null(KlassHandle resolved_klass, symbolHandle name, symbolHandle signature,
1015                                                         KlassHandle current_klass) {
1016   EXCEPTION_MARK;
1017   CallInfo info;
1018   resolve_special_call(info, resolved_klass, name, signature, current_klass, true, THREAD);
1019   if (HAS_PENDING_EXCEPTION) {
1020     CLEAR_PENDING_EXCEPTION;
1021     return methodHandle();
1022   }
1023   return info.selected_method();
1024 }
1025 
1026 
1027 
1028 //------------------------------------------------------------------------------------------------------------------------
1029 // ConstantPool entries
1030 
1031 void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, constantPoolHandle pool, int index, Bytecodes::Code byte, TRAPS) {
1032   switch (byte) {
1033     case Bytecodes::_invokestatic   : resolve_invokestatic   (result,       pool, index, CHECK); break;
1034     case Bytecodes::_invokespecial  : resolve_invokespecial  (result,       pool, index, CHECK); break;
1035     case Bytecodes::_invokevirtual  : resolve_invokevirtual  (result, recv, pool, index, CHECK); break;
1036     case Bytecodes::_invokedynamic  : resolve_invokedynamic  (result,       pool, index, CHECK); break;
1037     case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break;
1038   }
1039   return;
1040 }
1041 
1042 void LinkResolver::resolve_pool(KlassHandle& resolved_klass, symbolHandle& method_name, symbolHandle& method_signature,
1043                                 KlassHandle& current_klass, constantPoolHandle pool, int index, TRAPS) {
1044    // resolve klass
1045   resolve_klass(resolved_klass, pool, index, CHECK);
1046 
1047   // Get name, signature, and static klass
1048   method_name      = symbolHandle(THREAD, pool->name_ref_at(index));
1049   method_signature = symbolHandle(THREAD, pool->signature_ref_at(index));
1050   current_klass    = KlassHandle(THREAD, pool->pool_holder());
1051 }
1052 
1053 
1054 void LinkResolver::resolve_invokestatic(CallInfo& result, constantPoolHandle pool, int index, TRAPS) {
1055   KlassHandle  resolved_klass;
1056   symbolHandle method_name;
1057   symbolHandle method_signature;
1058   KlassHandle  current_klass;
1059   resolve_pool(resolved_klass, method_name,  method_signature, current_klass, pool, index, CHECK);
1060   resolve_static_call(result, resolved_klass, method_name, method_signature, current_klass, true, true, CHECK);
1061 }
1062 
1063 
1064 void LinkResolver::resolve_invokespecial(CallInfo& result, constantPoolHandle pool, int index, TRAPS) {
1065   KlassHandle  resolved_klass;
1066   symbolHandle method_name;
1067   symbolHandle method_signature;
1068   KlassHandle  current_klass;
1069   resolve_pool(resolved_klass, method_name,  method_signature, current_klass, pool, index, CHECK);
1070   resolve_special_call(result, resolved_klass, method_name, method_signature, current_klass, true, CHECK);
1071 }
1072 
1073 
1074 void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv,
1075                                           constantPoolHandle pool, int index,
1076                                           TRAPS) {
1077 
1078   KlassHandle  resolved_klass;
1079   symbolHandle method_name;
1080   symbolHandle method_signature;
1081   KlassHandle  current_klass;
1082   resolve_pool(resolved_klass, method_name,  method_signature, current_klass, pool, index, CHECK);
1083   KlassHandle recvrKlass (THREAD, recv.is_null() ? (klassOop)NULL : recv->klass());
1084   resolve_virtual_call(result, recv, recvrKlass, resolved_klass, method_name, method_signature, current_klass, true, true, CHECK);
1085 }
1086 
1087 
1088 void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, constantPoolHandle pool, int index, TRAPS) {
1089   KlassHandle  resolved_klass;
1090   symbolHandle method_name;
1091   symbolHandle method_signature;
1092   KlassHandle  current_klass;
1093   resolve_pool(resolved_klass, method_name,  method_signature, current_klass, pool, index, CHECK);
1094   KlassHandle recvrKlass (THREAD, recv.is_null() ? (klassOop)NULL : recv->klass());
1095   resolve_interface_call(result, recv, recvrKlass, resolved_klass, method_name, method_signature, current_klass, true, true, CHECK);
1096 }
1097 
1098 
1099 void LinkResolver::resolve_invokedynamic(CallInfo& result, constantPoolHandle pool, int raw_index, TRAPS) {
1100   assert(EnableInvokeDynamic, "");
1101 
1102   // This guy is reached from InterpreterRuntime::resolve_invokedynamic.
1103 
1104   // At this point, we only need the signature, and can ignore the name.
1105   symbolHandle method_signature(THREAD, pool->signature_ref_at(raw_index));  // raw_index works directly
1106   symbolHandle method_name = vmSymbolHandles::invokeExact_name();
1107   KlassHandle resolved_klass = SystemDictionaryHandles::MethodHandle_klass();
1108 
1109   // JSR 292:  this must be an implicitly generated method MethodHandle.invokeExact(*...)
1110   // The extra MH receiver will be inserted into the stack on every call.
1111   methodHandle resolved_method;
1112   KlassHandle current_klass(THREAD, pool->pool_holder());
1113   lookup_implicit_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, CHECK);
1114   if (resolved_method.is_null()) {
1115     THROW(vmSymbols::java_lang_InternalError());
1116   }
1117   result.set_dynamic(resolved_method, CHECK);
1118 }
1119 
1120 //------------------------------------------------------------------------------------------------------------------------
1121 #ifndef PRODUCT
1122 
1123 void FieldAccessInfo::print() {
1124   ResourceMark rm;
1125   tty->print_cr("Field %s@%d", name()->as_C_string(), field_offset());
1126 }
1127 
1128 #endif