1 /*
   2  * Copyright (c) 1997, 2019, 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 "aot/aotLoader.hpp"
  28 #include "classfile/classFileParser.hpp"
  29 #include "classfile/classFileStream.hpp"
  30 #include "classfile/classLoader.hpp"
  31 #include "classfile/classLoaderData.inline.hpp"
  32 #include "classfile/javaClasses.hpp"
  33 #include "classfile/moduleEntry.hpp"
  34 #include "classfile/symbolTable.hpp"
  35 #include "classfile/systemDictionary.hpp"
  36 #include "classfile/systemDictionaryShared.hpp"
  37 #include "classfile/verifier.hpp"
  38 #include "classfile/vmSymbols.hpp"
  39 #include "code/dependencyContext.hpp"
  40 #include "compiler/compileBroker.hpp"
  41 #include "gc/shared/collectedHeap.inline.hpp"
  42 #include "interpreter/oopMapCache.hpp"
  43 #include "interpreter/rewriter.hpp"
  44 #include "jvmtifiles/jvmti.h"
  45 #include "logging/log.hpp"
  46 #include "logging/logMessage.hpp"
  47 #include "logging/logStream.hpp"
  48 #include "memory/allocation.inline.hpp"
  49 #include "memory/heapInspection.hpp"
  50 #include "memory/iterator.inline.hpp"
  51 #include "memory/metadataFactory.hpp"
  52 #include "memory/metaspaceClosure.hpp"
  53 #include "memory/metaspaceShared.hpp"
  54 #include "memory/oopFactory.hpp"
  55 #include "memory/resourceArea.hpp"
  56 #include "memory/universe.hpp"
  57 #include "oops/fieldStreams.hpp"
  58 #include "oops/constantPool.hpp"
  59 #include "oops/instanceClassLoaderKlass.hpp"
  60 #include "oops/instanceKlass.inline.hpp"
  61 #include "oops/instanceMirrorKlass.hpp"
  62 #include "oops/instanceOop.hpp"
  63 #include "oops/klass.inline.hpp"
  64 #include "oops/method.hpp"
  65 #include "oops/oop.inline.hpp"
  66 #include "oops/symbol.hpp"
  67 #include "oops/valueKlass.hpp"
  68 #include "prims/jvmtiExport.hpp"
  69 #include "prims/jvmtiRedefineClasses.hpp"
  70 #include "prims/jvmtiThreadState.hpp"
  71 #include "prims/methodComparator.hpp"
  72 #include "runtime/atomic.hpp"
  73 #include "runtime/fieldDescriptor.inline.hpp"
  74 #include "runtime/handles.inline.hpp"
  75 #include "runtime/javaCalls.hpp"
  76 #include "runtime/mutexLocker.hpp"
  77 #include "runtime/orderAccess.hpp"
  78 #include "runtime/thread.inline.hpp"
  79 #include "services/classLoadingService.hpp"
  80 #include "services/threadService.hpp"
  81 #include "utilities/dtrace.hpp"
  82 #include "utilities/events.hpp"
  83 #include "utilities/macros.hpp"
  84 #include "utilities/stringUtils.hpp"
  85 #ifdef COMPILER1
  86 #include "c1/c1_Compiler.hpp"
  87 #endif
  88 #if INCLUDE_JFR
  89 #include "jfr/jfrEvents.hpp"
  90 #endif
  91 
  92 
  93 #ifdef DTRACE_ENABLED
  94 
  95 
  96 #define HOTSPOT_CLASS_INITIALIZATION_required HOTSPOT_CLASS_INITIALIZATION_REQUIRED
  97 #define HOTSPOT_CLASS_INITIALIZATION_recursive HOTSPOT_CLASS_INITIALIZATION_RECURSIVE
  98 #define HOTSPOT_CLASS_INITIALIZATION_concurrent HOTSPOT_CLASS_INITIALIZATION_CONCURRENT
  99 #define HOTSPOT_CLASS_INITIALIZATION_erroneous HOTSPOT_CLASS_INITIALIZATION_ERRONEOUS
 100 #define HOTSPOT_CLASS_INITIALIZATION_super__failed HOTSPOT_CLASS_INITIALIZATION_SUPER_FAILED
 101 #define HOTSPOT_CLASS_INITIALIZATION_clinit HOTSPOT_CLASS_INITIALIZATION_CLINIT
 102 #define HOTSPOT_CLASS_INITIALIZATION_error HOTSPOT_CLASS_INITIALIZATION_ERROR
 103 #define HOTSPOT_CLASS_INITIALIZATION_end HOTSPOT_CLASS_INITIALIZATION_END
 104 #define DTRACE_CLASSINIT_PROBE(type, thread_type)                \
 105   {                                                              \
 106     char* data = NULL;                                           \
 107     int len = 0;                                                 \
 108     Symbol* clss_name = name();                                  \
 109     if (clss_name != NULL) {                                     \
 110       data = (char*)clss_name->bytes();                          \
 111       len = clss_name->utf8_length();                            \
 112     }                                                            \
 113     HOTSPOT_CLASS_INITIALIZATION_##type(                         \
 114       data, len, (void*)class_loader(), thread_type);            \
 115   }
 116 
 117 #define DTRACE_CLASSINIT_PROBE_WAIT(type, thread_type, wait)     \
 118   {                                                              \
 119     char* data = NULL;                                           \
 120     int len = 0;                                                 \
 121     Symbol* clss_name = name();                                  \
 122     if (clss_name != NULL) {                                     \
 123       data = (char*)clss_name->bytes();                          \
 124       len = clss_name->utf8_length();                            \
 125     }                                                            \
 126     HOTSPOT_CLASS_INITIALIZATION_##type(                         \
 127       data, len, (void*)class_loader(), thread_type, wait);      \
 128   }
 129 
 130 #else //  ndef DTRACE_ENABLED
 131 
 132 #define DTRACE_CLASSINIT_PROBE(type, thread_type)
 133 #define DTRACE_CLASSINIT_PROBE_WAIT(type, thread_type, wait)
 134 
 135 #endif //  ndef DTRACE_ENABLED
 136 
 137 static inline bool is_class_loader(const Symbol* class_name,
 138                                    const ClassFileParser& parser) {
 139   assert(class_name != NULL, "invariant");
 140 
 141   if (class_name == vmSymbols::java_lang_ClassLoader()) {
 142     return true;
 143   }
 144 
 145   if (SystemDictionary::ClassLoader_klass_loaded()) {
 146     const Klass* const super_klass = parser.super_klass();
 147     if (super_klass != NULL) {
 148       if (super_klass->is_subtype_of(SystemDictionary::ClassLoader_klass())) {
 149         return true;
 150       }
 151     }
 152   }
 153   return false;
 154 }
 155 
 156 // called to verify that k is a member of this nest
 157 bool InstanceKlass::has_nest_member(InstanceKlass* k, TRAPS) const {
 158   if (_nest_members == NULL || _nest_members == Universe::the_empty_short_array()) {
 159     if (log_is_enabled(Trace, class, nestmates)) {
 160       ResourceMark rm(THREAD);
 161       log_trace(class, nestmates)("Checked nest membership of %s in non-nest-host class %s",
 162                                   k->external_name(), this->external_name());
 163     }
 164     return false;
 165   }
 166 
 167   if (log_is_enabled(Trace, class, nestmates)) {
 168     ResourceMark rm(THREAD);
 169     log_trace(class, nestmates)("Checking nest membership of %s in %s",
 170                                 k->external_name(), this->external_name());
 171   }
 172 
 173   // Check for a resolved cp entry , else fall back to a name check.
 174   // We don't want to resolve any class other than the one being checked.
 175   for (int i = 0; i < _nest_members->length(); i++) {
 176     int cp_index = _nest_members->at(i);
 177     if (_constants->tag_at(cp_index).is_klass()) {
 178       Klass* k2 = _constants->klass_at(cp_index, CHECK_false);
 179       if (k2 == k) {
 180         log_trace(class, nestmates)("- class is listed at nest_members[%d] => cp[%d]", i, cp_index);
 181         return true;
 182       }
 183     }
 184     else {
 185       Symbol* name = _constants->klass_name_at(cp_index);
 186       if (name == k->name()) {
 187         log_trace(class, nestmates)("- Found it at nest_members[%d] => cp[%d]", i, cp_index);
 188 
 189         // Names match so check actual klass - this may trigger class loading if
 190         // it doesn't match (though that should be impossible). But to be safe we
 191         // have to check for a compiler thread executing here.
 192         if (!THREAD->can_call_java() && !_constants->tag_at(cp_index).is_klass()) {
 193           log_trace(class, nestmates)("- validation required resolution in an unsuitable thread");
 194           return false;
 195         }
 196 
 197         Klass* k2 = _constants->klass_at(cp_index, CHECK_false);
 198         if (k2 == k) {
 199           log_trace(class, nestmates)("- class is listed as a nest member");
 200           return true;
 201         }
 202         else {
 203           // same name but different klass!
 204           log_trace(class, nestmates)(" - klass comparison failed!");
 205           // can't have two names the same, so we're done
 206           return false;
 207         }
 208       }
 209     }
 210   }
 211   log_trace(class, nestmates)("- class is NOT a nest member!");
 212   return false;
 213 }
 214 
 215 // Return nest-host class, resolving, validating and saving it if needed.
 216 // In cases where this is called from a thread that can not do classloading
 217 // (such as a native JIT thread) then we simply return NULL, which in turn
 218 // causes the access check to return false. Such code will retry the access
 219 // from a more suitable environment later.
 220 InstanceKlass* InstanceKlass::nest_host(Symbol* validationException, TRAPS) {
 221   InstanceKlass* nest_host_k = _nest_host;
 222   if (nest_host_k == NULL) {
 223     // need to resolve and save our nest-host class. This could be attempted
 224     // concurrently but as the result is idempotent and we don't use the class
 225     // then we do not need any synchronization beyond what is implicitly used
 226     // during class loading.
 227     if (_nest_host_index != 0) { // we have a real nest_host
 228       // Before trying to resolve check if we're in a suitable context
 229       if (!THREAD->can_call_java() && !_constants->tag_at(_nest_host_index).is_klass()) {
 230         if (log_is_enabled(Trace, class, nestmates)) {
 231           ResourceMark rm(THREAD);
 232           log_trace(class, nestmates)("Rejected resolution of nest-host of %s in unsuitable thread",
 233                                       this->external_name());
 234         }
 235         return NULL;
 236       }
 237 
 238       if (log_is_enabled(Trace, class, nestmates)) {
 239         ResourceMark rm(THREAD);
 240         log_trace(class, nestmates)("Resolving nest-host of %s using cp entry for %s",
 241                                     this->external_name(),
 242                                     _constants->klass_name_at(_nest_host_index)->as_C_string());
 243       }
 244 
 245       Klass* k = _constants->klass_at(_nest_host_index, THREAD);
 246       if (HAS_PENDING_EXCEPTION) {
 247         Handle exc_h = Handle(THREAD, PENDING_EXCEPTION);
 248         if (exc_h->is_a(SystemDictionary::NoClassDefFoundError_klass())) {
 249           // throw a new CDNFE with the original as its cause, and a clear msg
 250           ResourceMark rm(THREAD);
 251           char buf[200];
 252           CLEAR_PENDING_EXCEPTION;
 253           jio_snprintf(buf, sizeof(buf),
 254                        "Unable to load nest-host class (%s) of %s",
 255                        _constants->klass_name_at(_nest_host_index)->as_C_string(),
 256                        this->external_name());
 257           log_trace(class, nestmates)("%s - NoClassDefFoundError", buf);
 258           THROW_MSG_CAUSE_NULL(vmSymbols::java_lang_NoClassDefFoundError(), buf, exc_h);
 259         }
 260         // All other exceptions pass through (OOME, StackOverflowError, LinkageErrors etc).
 261         return NULL;
 262       }
 263 
 264       // A valid nest-host is an instance class in the current package that lists this
 265       // class as a nest member. If any of these conditions are not met we post the
 266       // requested exception type (if any) and return NULL
 267 
 268       const char* error = NULL;
 269 
 270       // JVMS 5.4.4 indicates package check comes first
 271       if (is_same_class_package(k)) {
 272 
 273         // Now check actual membership. We can't be a member if our "host" is
 274         // not an instance class.
 275         if (k->is_instance_klass()) {
 276           nest_host_k = InstanceKlass::cast(k);
 277 
 278           bool is_member = nest_host_k->has_nest_member(this, CHECK_NULL);
 279           if (is_member) {
 280             // save resolved nest-host value
 281             _nest_host = nest_host_k;
 282 
 283             if (log_is_enabled(Trace, class, nestmates)) {
 284               ResourceMark rm(THREAD);
 285               log_trace(class, nestmates)("Resolved nest-host of %s to %s",
 286                                           this->external_name(), k->external_name());
 287             }
 288             return nest_host_k;
 289           }
 290         }
 291         error = "current type is not listed as a nest member";
 292       } else {
 293         error = "types are in different packages";
 294       }
 295 
 296       if (log_is_enabled(Trace, class, nestmates)) {
 297         ResourceMark rm(THREAD);
 298         log_trace(class, nestmates)
 299           ("Type %s (loader: %s) is not a nest member of "
 300            "resolved type %s (loader: %s): %s",
 301            this->external_name(),
 302            this->class_loader_data()->loader_name_and_id(),
 303            k->external_name(),
 304            k->class_loader_data()->loader_name_and_id(),
 305            error);
 306       }
 307 
 308       if (validationException != NULL && THREAD->can_call_java()) {
 309         ResourceMark rm(THREAD);
 310         Exceptions::fthrow(THREAD_AND_LOCATION,
 311                            validationException,
 312                            "Type %s (loader: %s) is not a nest member of %s (loader: %s): %s",
 313                            this->external_name(),
 314                            this->class_loader_data()->loader_name_and_id(),
 315                            k->external_name(),
 316                            k->class_loader_data()->loader_name_and_id(),
 317                            error
 318                            );
 319       }
 320       return NULL;
 321     } else {
 322       if (log_is_enabled(Trace, class, nestmates)) {
 323         ResourceMark rm(THREAD);
 324         log_trace(class, nestmates)("Type %s is not part of a nest: setting nest-host to self",
 325                                     this->external_name());
 326       }
 327       // save resolved nest-host value
 328       return (_nest_host = this);
 329     }
 330   }
 331   return nest_host_k;
 332 }
 333 
 334 // check if 'this' and k are nestmates (same nest_host), or k is our nest_host,
 335 // or we are k's nest_host - all of which is covered by comparing the two
 336 // resolved_nest_hosts
 337 bool InstanceKlass::has_nestmate_access_to(InstanceKlass* k, TRAPS) {
 338 
 339   assert(this != k, "this should be handled by higher-level code");
 340 
 341   // Per JVMS 5.4.4 we first resolve and validate the current class, then
 342   // the target class k. Resolution exceptions will be passed on by upper
 343   // layers. IncompatibleClassChangeErrors from membership validation failures
 344   // will also be passed through.
 345 
 346   Symbol* icce = vmSymbols::java_lang_IncompatibleClassChangeError();
 347   InstanceKlass* cur_host = nest_host(icce, CHECK_false);
 348   if (cur_host == NULL) {
 349     return false;
 350   }
 351 
 352   Klass* k_nest_host = k->nest_host(icce, CHECK_false);
 353   if (k_nest_host == NULL) {
 354     return false;
 355   }
 356 
 357   bool access = (cur_host == k_nest_host);
 358 
 359   if (log_is_enabled(Trace, class, nestmates)) {
 360     ResourceMark rm(THREAD);
 361     log_trace(class, nestmates)("Class %s does %shave nestmate access to %s",
 362                                 this->external_name(),
 363                                 access ? "" : "NOT ",
 364                                 k->external_name());
 365   }
 366 
 367   return access;
 368 }
 369 
 370 InstanceKlass* InstanceKlass::allocate_instance_klass(const ClassFileParser& parser, TRAPS) {
 371   const int size = InstanceKlass::size(parser.vtable_size(),
 372                                        parser.itable_size(),
 373                                        nonstatic_oop_map_size(parser.total_oop_map_count()),
 374                                        parser.is_interface(),
 375                                        parser.is_unsafe_anonymous(),
 376                                        should_store_fingerprint(parser.is_unsafe_anonymous()),
 377                                        parser.has_flattenable_fields() ? parser.java_fields_count() : 0,
 378                                        parser.is_value_type());
 379 
 380   const Symbol* const class_name = parser.class_name();
 381   assert(class_name != NULL, "invariant");
 382   ClassLoaderData* loader_data = parser.loader_data();
 383   assert(loader_data != NULL, "invariant");
 384 
 385   InstanceKlass* ik;
 386 
 387   // Allocation
 388   if (REF_NONE == parser.reference_type()) {
 389     if (class_name == vmSymbols::java_lang_Class()) {
 390       // mirror
 391       ik = new (loader_data, size, THREAD) InstanceMirrorKlass(parser);
 392     } else if (is_class_loader(class_name, parser)) {
 393       // class loader
 394       ik = new (loader_data, size, THREAD) InstanceClassLoaderKlass(parser);
 395     } else if (parser.is_value_type()) {
 396       // value type
 397       ik = new (loader_data, size, THREAD) ValueKlass(parser);
 398     } else {
 399       // normal
 400       ik = new (loader_data, size, THREAD) InstanceKlass(parser, InstanceKlass::_misc_kind_other);
 401     }
 402   } else {
 403     // reference
 404     ik = new (loader_data, size, THREAD) InstanceRefKlass(parser);
 405   }
 406 
 407   // Check for pending exception before adding to the loader data and incrementing
 408   // class count.  Can get OOM here.
 409   if (HAS_PENDING_EXCEPTION) {
 410     return NULL;
 411   }
 412 
 413 #ifdef ASSERT
 414   assert(ik->size() == size, "");
 415   ik->bounds_check((address) ik->start_of_vtable(), false, size);
 416   ik->bounds_check((address) ik->start_of_itable(), false, size);
 417   ik->bounds_check((address) ik->end_of_itable(), true, size);
 418   ik->bounds_check((address) ik->end_of_nonstatic_oop_maps(), true, size);
 419 #endif //ASSERT
 420   return ik;
 421 }
 422 
 423 #ifndef PRODUCT
 424 bool InstanceKlass::bounds_check(address addr, bool edge_ok, intptr_t size_in_bytes) const {
 425   const char* bad = NULL;
 426   address end = NULL;
 427   if (addr < (address)this) {
 428     bad = "before";
 429   } else if (addr == (address)this) {
 430     if (edge_ok)  return true;
 431     bad = "just before";
 432   } else if (addr == (end = (address)this + sizeof(intptr_t) * (size_in_bytes < 0 ? size() : size_in_bytes))) {
 433     if (edge_ok)  return true;
 434     bad = "just after";
 435   } else if (addr > end) {
 436     bad = "after";
 437   } else {
 438     return true;
 439   }
 440   tty->print_cr("%s object bounds: " INTPTR_FORMAT " [" INTPTR_FORMAT ".." INTPTR_FORMAT "]",
 441       bad, (intptr_t)addr, (intptr_t)this, (intptr_t)end);
 442   Verbose = WizardMode = true; this->print(); //@@
 443   return false;
 444 }
 445 #endif //PRODUCT
 446 
 447 // copy method ordering from resource area to Metaspace
 448 void InstanceKlass::copy_method_ordering(const intArray* m, TRAPS) {
 449   if (m != NULL) {
 450     // allocate a new array and copy contents (memcpy?)
 451     _method_ordering = MetadataFactory::new_array<int>(class_loader_data(), m->length(), CHECK);
 452     for (int i = 0; i < m->length(); i++) {
 453       _method_ordering->at_put(i, m->at(i));
 454     }
 455   } else {
 456     _method_ordering = Universe::the_empty_int_array();
 457   }
 458 }
 459 
 460 // create a new array of vtable_indices for default methods
 461 Array<int>* InstanceKlass::create_new_default_vtable_indices(int len, TRAPS) {
 462   Array<int>* vtable_indices = MetadataFactory::new_array<int>(class_loader_data(), len, CHECK_NULL);
 463   assert(default_vtable_indices() == NULL, "only create once");
 464   set_default_vtable_indices(vtable_indices);
 465   return vtable_indices;
 466 }
 467 
 468 InstanceKlass::InstanceKlass(const ClassFileParser& parser, unsigned kind, KlassID id) :
 469   Klass(id),
 470   _nest_members(NULL),
 471   _nest_host_index(0),
 472   _nest_host(NULL),
 473   _static_field_size(parser.static_field_size()),
 474   _nonstatic_oop_map_size(nonstatic_oop_map_size(parser.total_oop_map_count())),
 475   _itable_len(parser.itable_size()),
 476   _extra_flags(0),
 477   _init_thread(NULL),
 478   _init_state(allocated),
 479   _reference_type(parser.reference_type()),
 480   _adr_valueklass_fixed_block(NULL)
 481 {
 482   set_vtable_length(parser.vtable_size());
 483   set_kind(kind);
 484   set_access_flags(parser.access_flags());
 485   set_is_unsafe_anonymous(parser.is_unsafe_anonymous());
 486   set_layout_helper(Klass::instance_layout_helper(parser.layout_size(),
 487                                                     false));
 488     if (parser.has_flattenable_fields()) {
 489       set_has_value_fields();
 490     }
 491     _java_fields_count = parser.java_fields_count();
 492 
 493     assert(NULL == _methods, "underlying memory not zeroed?");
 494     assert(is_instance_klass(), "is layout incorrect?");
 495     assert(size_helper() == parser.layout_size(), "incorrect size_helper?");
 496 
 497   if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
 498       SystemDictionaryShared::init_dumptime_info(this);
 499     }
 500 }
 501 
 502 void InstanceKlass::deallocate_methods(ClassLoaderData* loader_data,
 503                                        Array<Method*>* methods) {
 504   if (methods != NULL && methods != Universe::the_empty_method_array() &&
 505       !methods->is_shared()) {
 506     for (int i = 0; i < methods->length(); i++) {
 507       Method* method = methods->at(i);
 508       if (method == NULL) continue;  // maybe null if error processing
 509       // Only want to delete methods that are not executing for RedefineClasses.
 510       // The previous version will point to them so they're not totally dangling
 511       assert (!method->on_stack(), "shouldn't be called with methods on stack");
 512       MetadataFactory::free_metadata(loader_data, method);
 513     }
 514     MetadataFactory::free_array<Method*>(loader_data, methods);
 515   }
 516 }
 517 
 518 void InstanceKlass::deallocate_interfaces(ClassLoaderData* loader_data,
 519                                           const Klass* super_klass,
 520                                           Array<InstanceKlass*>* local_interfaces,
 521                                           Array<InstanceKlass*>* transitive_interfaces) {
 522   // Only deallocate transitive interfaces if not empty, same as super class
 523   // or same as local interfaces.  See code in parseClassFile.
 524   Array<InstanceKlass*>* ti = transitive_interfaces;
 525   if (ti != Universe::the_empty_instance_klass_array() && ti != local_interfaces) {
 526     // check that the interfaces don't come from super class
 527     Array<InstanceKlass*>* sti = (super_klass == NULL) ? NULL :
 528                     InstanceKlass::cast(super_klass)->transitive_interfaces();
 529     if (ti != sti && ti != NULL && !ti->is_shared()) {
 530       MetadataFactory::free_array<InstanceKlass*>(loader_data, ti);
 531     }
 532   }
 533 
 534   // local interfaces can be empty
 535   if (local_interfaces != Universe::the_empty_instance_klass_array() &&
 536       local_interfaces != NULL && !local_interfaces->is_shared()) {
 537     MetadataFactory::free_array<InstanceKlass*>(loader_data, local_interfaces);
 538   }
 539 }
 540 
 541 // This function deallocates the metadata and C heap pointers that the
 542 // InstanceKlass points to.
 543 void InstanceKlass::deallocate_contents(ClassLoaderData* loader_data) {
 544 
 545   // Orphan the mirror first, CMS thinks it's still live.
 546   if (java_mirror() != NULL) {
 547     java_lang_Class::set_klass(java_mirror(), NULL);
 548   }
 549 
 550   // Also remove mirror from handles
 551   loader_data->remove_handle(_java_mirror);
 552 
 553   // Need to take this class off the class loader data list.
 554   loader_data->remove_class(this);
 555 
 556   // The array_klass for this class is created later, after error handling.
 557   // For class redefinition, we keep the original class so this scratch class
 558   // doesn't have an array class.  Either way, assert that there is nothing
 559   // to deallocate.
 560   assert(array_klasses() == NULL, "array classes shouldn't be created for this class yet");
 561 
 562   // Release C heap allocated data that this might point to, which includes
 563   // reference counting symbol names.
 564   release_C_heap_structures();
 565 
 566   deallocate_methods(loader_data, methods());
 567   set_methods(NULL);
 568 
 569   if (method_ordering() != NULL &&
 570       method_ordering() != Universe::the_empty_int_array() &&
 571       !method_ordering()->is_shared()) {
 572     MetadataFactory::free_array<int>(loader_data, method_ordering());
 573   }
 574   set_method_ordering(NULL);
 575 
 576   // default methods can be empty
 577   if (default_methods() != NULL &&
 578       default_methods() != Universe::the_empty_method_array() &&
 579       !default_methods()->is_shared()) {
 580     MetadataFactory::free_array<Method*>(loader_data, default_methods());
 581   }
 582   // Do NOT deallocate the default methods, they are owned by superinterfaces.
 583   set_default_methods(NULL);
 584 
 585   // default methods vtable indices can be empty
 586   if (default_vtable_indices() != NULL &&
 587       !default_vtable_indices()->is_shared()) {
 588     MetadataFactory::free_array<int>(loader_data, default_vtable_indices());
 589   }
 590   set_default_vtable_indices(NULL);
 591 
 592 
 593   // This array is in Klass, but remove it with the InstanceKlass since
 594   // this place would be the only caller and it can share memory with transitive
 595   // interfaces.
 596   if (secondary_supers() != NULL &&
 597       secondary_supers() != Universe::the_empty_klass_array() &&
 598       // see comments in compute_secondary_supers about the following cast
 599       (address)(secondary_supers()) != (address)(transitive_interfaces()) &&
 600       !secondary_supers()->is_shared()) {
 601     MetadataFactory::free_array<Klass*>(loader_data, secondary_supers());
 602   }
 603   set_secondary_supers(NULL);
 604 
 605   deallocate_interfaces(loader_data, super(), local_interfaces(), transitive_interfaces());
 606   set_transitive_interfaces(NULL);
 607   set_local_interfaces(NULL);
 608 
 609   if (fields() != NULL && !fields()->is_shared()) {
 610     MetadataFactory::free_array<jushort>(loader_data, fields());
 611   }
 612   set_fields(NULL, 0);
 613 
 614   // If a method from a redefined class is using this constant pool, don't
 615   // delete it, yet.  The new class's previous version will point to this.
 616   if (constants() != NULL) {
 617     assert (!constants()->on_stack(), "shouldn't be called if anything is onstack");
 618     if (!constants()->is_shared()) {
 619       MetadataFactory::free_metadata(loader_data, constants());
 620     }
 621     // Delete any cached resolution errors for the constant pool
 622     SystemDictionary::delete_resolution_error(constants());
 623 
 624     set_constants(NULL);
 625   }
 626 
 627   if (inner_classes() != NULL &&
 628       inner_classes() != Universe::the_empty_short_array() &&
 629       !inner_classes()->is_shared()) {
 630     MetadataFactory::free_array<jushort>(loader_data, inner_classes());
 631   }
 632   set_inner_classes(NULL);
 633 
 634   if (nest_members() != NULL &&
 635       nest_members() != Universe::the_empty_short_array() &&
 636       !nest_members()->is_shared()) {
 637     MetadataFactory::free_array<jushort>(loader_data, nest_members());
 638   }
 639   set_nest_members(NULL);
 640 
 641   // We should deallocate the Annotations instance if it's not in shared spaces.
 642   if (annotations() != NULL && !annotations()->is_shared()) {
 643     MetadataFactory::free_metadata(loader_data, annotations());
 644   }
 645   set_annotations(NULL);
 646 
 647   if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
 648     SystemDictionaryShared::remove_dumptime_info(this);
 649   }
 650 }
 651 
 652 bool InstanceKlass::should_be_initialized() const {
 653   return !is_initialized();
 654 }
 655 
 656 klassItable InstanceKlass::itable() const {
 657   return klassItable(const_cast<InstanceKlass*>(this));
 658 }
 659 
 660 void InstanceKlass::eager_initialize(Thread *thread) {
 661   if (!EagerInitialization) return;
 662 
 663   if (this->is_not_initialized()) {
 664     // abort if the the class has a class initializer
 665     if (this->class_initializer() != NULL) return;
 666 
 667     // abort if it is java.lang.Object (initialization is handled in genesis)
 668     Klass* super_klass = super();
 669     if (super_klass == NULL) return;
 670 
 671     // abort if the super class should be initialized
 672     if (!InstanceKlass::cast(super_klass)->is_initialized()) return;
 673 
 674     // call body to expose the this pointer
 675     eager_initialize_impl();
 676   }
 677 }
 678 
 679 // JVMTI spec thinks there are signers and protection domain in the
 680 // instanceKlass.  These accessors pretend these fields are there.
 681 // The hprof specification also thinks these fields are in InstanceKlass.
 682 oop InstanceKlass::protection_domain() const {
 683   // return the protection_domain from the mirror
 684   return java_lang_Class::protection_domain(java_mirror());
 685 }
 686 
 687 // To remove these from requires an incompatible change and CCC request.
 688 objArrayOop InstanceKlass::signers() const {
 689   // return the signers from the mirror
 690   return java_lang_Class::signers(java_mirror());
 691 }
 692 
 693 oop InstanceKlass::init_lock() const {
 694   // return the init lock from the mirror
 695   oop lock = java_lang_Class::init_lock(java_mirror());
 696   // Prevent reordering with any access of initialization state
 697   OrderAccess::loadload();
 698   assert((oop)lock != NULL || !is_not_initialized(), // initialized or in_error state
 699          "only fully initialized state can have a null lock");
 700   return lock;
 701 }
 702 
 703 // Set the initialization lock to null so the object can be GC'ed.  Any racing
 704 // threads to get this lock will see a null lock and will not lock.
 705 // That's okay because they all check for initialized state after getting
 706 // the lock and return.
 707 void InstanceKlass::fence_and_clear_init_lock() {
 708   // make sure previous stores are all done, notably the init_state.
 709   OrderAccess::storestore();
 710   java_lang_Class::set_init_lock(java_mirror(), NULL);
 711   assert(!is_not_initialized(), "class must be initialized now");
 712 }
 713 
 714 void InstanceKlass::eager_initialize_impl() {
 715   EXCEPTION_MARK;
 716   HandleMark hm(THREAD);
 717   Handle h_init_lock(THREAD, init_lock());
 718   ObjectLocker ol(h_init_lock, THREAD, h_init_lock() != NULL);
 719 
 720   // abort if someone beat us to the initialization
 721   if (!is_not_initialized()) return;  // note: not equivalent to is_initialized()
 722 
 723   ClassState old_state = init_state();
 724   link_class_impl(THREAD);
 725   if (HAS_PENDING_EXCEPTION) {
 726     CLEAR_PENDING_EXCEPTION;
 727     // Abort if linking the class throws an exception.
 728 
 729     // Use a test to avoid redundantly resetting the state if there's
 730     // no change.  Set_init_state() asserts that state changes make
 731     // progress, whereas here we might just be spinning in place.
 732     if (old_state != _init_state)
 733       set_init_state(old_state);
 734   } else {
 735     // linking successfull, mark class as initialized
 736     set_init_state(fully_initialized);
 737     fence_and_clear_init_lock();
 738     // trace
 739     if (log_is_enabled(Info, class, init)) {
 740       ResourceMark rm(THREAD);
 741       log_info(class, init)("[Initialized %s without side effects]", external_name());
 742     }
 743   }
 744 }
 745 
 746 
 747 // See "The Virtual Machine Specification" section 2.16.5 for a detailed explanation of the class initialization
 748 // process. The step comments refers to the procedure described in that section.
 749 // Note: implementation moved to static method to expose the this pointer.
 750 void InstanceKlass::initialize(TRAPS) {
 751   if (this->should_be_initialized()) {
 752     initialize_impl(CHECK);
 753     // Note: at this point the class may be initialized
 754     //       OR it may be in the state of being initialized
 755     //       in case of recursive initialization!
 756   } else {
 757     assert(is_initialized(), "sanity check");
 758   }
 759 }
 760 
 761 
 762 bool InstanceKlass::verify_code(TRAPS) {
 763   // 1) Verify the bytecodes
 764   return Verifier::verify(this, should_verify_class(), THREAD);
 765 }
 766 
 767 void InstanceKlass::link_class(TRAPS) {
 768   assert(is_loaded(), "must be loaded");
 769   if (!is_linked()) {
 770     link_class_impl(CHECK);
 771   }
 772 }
 773 
 774 // Called to verify that a class can link during initialization, without
 775 // throwing a VerifyError.
 776 bool InstanceKlass::link_class_or_fail(TRAPS) {
 777   assert(is_loaded(), "must be loaded");
 778   if (!is_linked()) {
 779     link_class_impl(CHECK_false);
 780   }
 781   return is_linked();
 782 }
 783 
 784 bool InstanceKlass::link_class_impl(TRAPS) {
 785   if (DumpSharedSpaces && is_in_error_state()) {
 786     // This is for CDS dumping phase only -- we use the in_error_state to indicate that
 787     // the class has failed verification. Throwing the NoClassDefFoundError here is just
 788     // a convenient way to stop repeat attempts to verify the same (bad) class.
 789     //
 790     // Note that the NoClassDefFoundError is not part of the JLS, and should not be thrown
 791     // if we are executing Java code. This is not a problem for CDS dumping phase since
 792     // it doesn't execute any Java code.
 793     ResourceMark rm(THREAD);
 794     Exceptions::fthrow(THREAD_AND_LOCATION,
 795                        vmSymbols::java_lang_NoClassDefFoundError(),
 796                        "Class %s, or one of its supertypes, failed class initialization",
 797                        external_name());
 798     return false;
 799   }
 800   // return if already verified
 801   if (is_linked()) {
 802     return true;
 803   }
 804 
 805   // Timing
 806   // timer handles recursion
 807   assert(THREAD->is_Java_thread(), "non-JavaThread in link_class_impl");
 808   JavaThread* jt = (JavaThread*)THREAD;
 809 
 810   // link super class before linking this class
 811   Klass* super_klass = super();
 812   if (super_klass != NULL) {
 813     if (super_klass->is_interface()) {  // check if super class is an interface
 814       ResourceMark rm(THREAD);
 815       Exceptions::fthrow(
 816         THREAD_AND_LOCATION,
 817         vmSymbols::java_lang_IncompatibleClassChangeError(),
 818         "class %s has interface %s as super class",
 819         external_name(),
 820         super_klass->external_name()
 821       );
 822       return false;
 823     }
 824 
 825     InstanceKlass* ik_super = InstanceKlass::cast(super_klass);
 826     ik_super->link_class_impl(CHECK_false);
 827   }
 828 
 829   // link all interfaces implemented by this class before linking this class
 830   Array<InstanceKlass*>* interfaces = local_interfaces();
 831   int num_interfaces = interfaces->length();
 832   for (int index = 0; index < num_interfaces; index++) {
 833     InstanceKlass* interk = interfaces->at(index);
 834     interk->link_class_impl(CHECK_false);
 835   }
 836 
 837 
 838   // If a class declares a method that uses a value class as an argument
 839   // type or return value type, this value class must be loaded during the
 840   // linking of this class because size and properties of the value class
 841   // must be known in order to be able to perform value type optimizations.
 842   // The implementation below is an approximation of this rule, the code
 843   // iterates over all methods of the current class (including overridden
 844   // methods), not only the methods declared by this class. This
 845   // approximation makes the code simpler, and doesn't change the semantic
 846   // because classes declaring methods overridden by the current class are
 847   // linked (and have performed their own pre-loading) before the linking
 848   // of the current class.
 849   // This is also the moment to detect potential mismatch between the
 850   // ValueTypes attribute and the kind of the class effectively loaded.
 851 
 852 
 853   // Note:
 854   // Value class types used for flattenable fields are loaded during
 855   // the loading phase (see ClassFileParser::post_process_parsed_stream()).
 856   // Value class types used as element types for array creation
 857   // are not pre-loaded. Their loading is triggered by either anewarray
 858   // or multianewarray bytecodes.
 859 
 860   // Could it be possible to do the following processing only if the
 861   // class uses value types?
 862   {
 863     ResourceMark rm(THREAD);
 864     for (int i = 0; i < methods()->length(); i++) {
 865       Method* m = methods()->at(i);
 866       for (SignatureStream ss(m->signature()); !ss.is_done(); ss.next()) {
 867         Symbol* sig = ss.as_symbol();
 868         if (ss.is_object()) {
 869           Symbol* symb = sig;
 870           if (ss.is_array()) {
 871             int i=0;
 872             while (sig->char_at(i) == '[') i++;
 873             if (i == sig->utf8_length() - 1 ) continue; // primitive array
 874             symb = SymbolTable::new_symbol(sig->as_C_string() + i + 1,
 875                                            sig->utf8_length() - 3);
 876           }
 877           if (ss.type() == T_VALUETYPE) {
 878             oop loader = class_loader();
 879             oop protection_domain = this->protection_domain();
 880             Klass* klass = SystemDictionary::resolve_or_fail(symb,
 881                                                              Handle(THREAD, loader), Handle(THREAD, protection_domain), true,
 882                                                              CHECK_false);
 883             if (symb != sig) {
 884               symb->decrement_refcount();
 885             }
 886             if (klass == NULL) {
 887               THROW_(vmSymbols::java_lang_LinkageError(), false);
 888             }
 889             if (!klass->is_value()) {
 890               THROW_(vmSymbols::java_lang_IncompatibleClassChangeError(), false);
 891             }
 892           }
 893         }
 894       }
 895     }
 896   }
 897 
 898   // in case the class is linked in the process of linking its superclasses
 899   if (is_linked()) {
 900     return true;
 901   }
 902 
 903   // trace only the link time for this klass that includes
 904   // the verification time
 905   PerfClassTraceTime vmtimer(ClassLoader::perf_class_link_time(),
 906                              ClassLoader::perf_class_link_selftime(),
 907                              ClassLoader::perf_classes_linked(),
 908                              jt->get_thread_stat()->perf_recursion_counts_addr(),
 909                              jt->get_thread_stat()->perf_timers_addr(),
 910                              PerfClassTraceTime::CLASS_LINK);
 911 
 912   // verification & rewriting
 913   {
 914     HandleMark hm(THREAD);
 915     Handle h_init_lock(THREAD, init_lock());
 916     ObjectLocker ol(h_init_lock, THREAD, h_init_lock() != NULL);
 917     // rewritten will have been set if loader constraint error found
 918     // on an earlier link attempt
 919     // don't verify or rewrite if already rewritten
 920     //
 921 
 922     if (!is_linked()) {
 923       if (!is_rewritten()) {
 924         {
 925           bool verify_ok = verify_code(THREAD);
 926           if (!verify_ok) {
 927             return false;
 928           }
 929         }
 930 
 931         // Just in case a side-effect of verify linked this class already
 932         // (which can sometimes happen since the verifier loads classes
 933         // using custom class loaders, which are free to initialize things)
 934         if (is_linked()) {
 935           return true;
 936         }
 937 
 938         // also sets rewritten
 939         rewrite_class(CHECK_false);
 940       } else if (is_shared()) {
 941         SystemDictionaryShared::check_verification_constraints(this, CHECK_false);
 942       }
 943 
 944       // relocate jsrs and link methods after they are all rewritten
 945       link_methods(CHECK_false);
 946 
 947       // Initialize the vtable and interface table after
 948       // methods have been rewritten since rewrite may
 949       // fabricate new Method*s.
 950       // also does loader constraint checking
 951       //
 952       // initialize_vtable and initialize_itable need to be rerun for
 953       // a shared class if the class is not loaded by the NULL classloader.
 954       ClassLoaderData * loader_data = class_loader_data();
 955       if (!(is_shared() &&
 956             loader_data->is_the_null_class_loader_data())) {
 957         vtable().initialize_vtable(true, CHECK_false);
 958         itable().initialize_itable(true, CHECK_false);
 959       }
 960 #ifdef ASSERT
 961       else {
 962         vtable().verify(tty, true);
 963         // In case itable verification is ever added.
 964         // itable().verify(tty, true);
 965       }
 966 #endif
 967 
 968       set_init_state(linked);
 969       if (JvmtiExport::should_post_class_prepare()) {
 970         Thread *thread = THREAD;
 971         assert(thread->is_Java_thread(), "thread->is_Java_thread()");
 972         JvmtiExport::post_class_prepare((JavaThread *) thread, this);
 973       }
 974     }
 975   }
 976   return true;
 977 }
 978 
 979 // Rewrite the byte codes of all of the methods of a class.
 980 // The rewriter must be called exactly once. Rewriting must happen after
 981 // verification but before the first method of the class is executed.
 982 void InstanceKlass::rewrite_class(TRAPS) {
 983   assert(is_loaded(), "must be loaded");
 984   if (is_rewritten()) {
 985     assert(is_shared(), "rewriting an unshared class?");
 986     return;
 987   }
 988   Rewriter::rewrite(this, CHECK);
 989   set_rewritten();
 990 }
 991 
 992 // Now relocate and link method entry points after class is rewritten.
 993 // This is outside is_rewritten flag. In case of an exception, it can be
 994 // executed more than once.
 995 void InstanceKlass::link_methods(TRAPS) {
 996   int len = methods()->length();
 997   for (int i = len-1; i >= 0; i--) {
 998     methodHandle m(THREAD, methods()->at(i));
 999 
1000     // Set up method entry points for compiler and interpreter    .
1001     m->link_method(m, CHECK);
1002   }
1003 }
1004 
1005 // Eagerly initialize superinterfaces that declare default methods (concrete instance: any access)
1006 void InstanceKlass::initialize_super_interfaces(TRAPS) {
1007   assert (has_nonstatic_concrete_methods(), "caller should have checked this");
1008   for (int i = 0; i < local_interfaces()->length(); ++i) {
1009     InstanceKlass* ik = local_interfaces()->at(i);
1010 
1011     // Initialization is depth first search ie. we start with top of the inheritance tree
1012     // has_nonstatic_concrete_methods drives searching superinterfaces since it
1013     // means has_nonstatic_concrete_methods in its superinterface hierarchy
1014     if (ik->has_nonstatic_concrete_methods()) {
1015       ik->initialize_super_interfaces(CHECK);
1016     }
1017 
1018     // Only initialize() interfaces that "declare" concrete methods.
1019     if (ik->should_be_initialized() && ik->declares_nonstatic_concrete_methods()) {
1020       ik->initialize(CHECK);
1021     }
1022   }
1023 }
1024 
1025 void InstanceKlass::initialize_impl(TRAPS) {
1026   HandleMark hm(THREAD);
1027 
1028   // Make sure klass is linked (verified) before initialization
1029   // A class could already be verified, since it has been reflected upon.
1030   link_class(CHECK);
1031 
1032   DTRACE_CLASSINIT_PROBE(required, -1);
1033 
1034   bool wait = false;
1035 
1036   assert(THREAD->is_Java_thread(), "non-JavaThread in initialize_impl");
1037   JavaThread* jt = (JavaThread*)THREAD;
1038 
1039   // refer to the JVM book page 47 for description of steps
1040   // Step 1
1041   {
1042     Handle h_init_lock(THREAD, init_lock());
1043     ObjectLocker ol(h_init_lock, THREAD, h_init_lock() != NULL);
1044 
1045     // Step 2
1046     // If we were to use wait() instead of waitInterruptibly() then
1047     // we might end up throwing IE from link/symbol resolution sites
1048     // that aren't expected to throw.  This would wreak havoc.  See 6320309.
1049     while (is_being_initialized() && !is_reentrant_initialization(jt)) {
1050       wait = true;
1051       jt->set_class_to_be_initialized(this);
1052       ol.waitUninterruptibly(jt);
1053       jt->set_class_to_be_initialized(NULL);
1054     }
1055 
1056     // Step 3
1057     if (is_being_initialized() && is_reentrant_initialization(jt)) {
1058       DTRACE_CLASSINIT_PROBE_WAIT(recursive, -1, wait);
1059       return;
1060     }
1061 
1062     // Step 4
1063     if (is_initialized()) {
1064       DTRACE_CLASSINIT_PROBE_WAIT(concurrent, -1, wait);
1065       return;
1066     }
1067 
1068     // Step 5
1069     if (is_in_error_state()) {
1070       DTRACE_CLASSINIT_PROBE_WAIT(erroneous, -1, wait);
1071       ResourceMark rm(THREAD);
1072       const char* desc = "Could not initialize class ";
1073       const char* className = external_name();
1074       size_t msglen = strlen(desc) + strlen(className) + 1;
1075       char* message = NEW_RESOURCE_ARRAY(char, msglen);
1076       if (NULL == message) {
1077         // Out of memory: can't create detailed error message
1078           THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), className);
1079       } else {
1080         jio_snprintf(message, msglen, "%s%s", desc, className);
1081           THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), message);
1082       }
1083     }
1084 
1085     // Step 6
1086     set_init_state(being_initialized);
1087     set_init_thread(jt);
1088   }
1089 
1090   // Step 7
1091   // Next, if C is a class rather than an interface, initialize it's super class and super
1092   // interfaces.
1093   if (!is_interface()) {
1094     Klass* super_klass = super();
1095     if (super_klass != NULL && super_klass->should_be_initialized()) {
1096       super_klass->initialize(THREAD);
1097     }
1098     // If C implements any interface that declares a non-static, concrete method,
1099     // the initialization of C triggers initialization of its super interfaces.
1100     // Only need to recurse if has_nonstatic_concrete_methods which includes declaring and
1101     // having a superinterface that declares, non-static, concrete methods
1102     if (!HAS_PENDING_EXCEPTION && has_nonstatic_concrete_methods()) {
1103       initialize_super_interfaces(THREAD);
1104     }
1105 
1106     // If any exceptions, complete abruptly, throwing the same exception as above.
1107     if (HAS_PENDING_EXCEPTION) {
1108       Handle e(THREAD, PENDING_EXCEPTION);
1109       CLEAR_PENDING_EXCEPTION;
1110       {
1111         EXCEPTION_MARK;
1112         // Locks object, set state, and notify all waiting threads
1113         set_initialization_state_and_notify(initialization_error, THREAD);
1114         CLEAR_PENDING_EXCEPTION;
1115       }
1116       DTRACE_CLASSINIT_PROBE_WAIT(super__failed, -1, wait);
1117       THROW_OOP(e());
1118     }
1119   }
1120 
1121   // Step 8
1122   // Initialize classes of flattenable fields
1123   {
1124     for (AllFieldStream fs(this); !fs.done(); fs.next()) {
1125       if (fs.is_flattenable()) {
1126         InstanceKlass* field_klass = InstanceKlass::cast(this->get_value_field_klass(fs.index()));









1127         field_klass->initialize(CHECK);
1128       }
1129     }
1130   }
1131 
1132 
1133   // Look for aot compiled methods for this klass, including class initializer.
1134   AOTLoader::load_for_klass(this, THREAD);
1135 
1136   // Step 9
1137   {
1138     DTRACE_CLASSINIT_PROBE_WAIT(clinit, -1, wait);
1139     // Timer includes any side effects of class initialization (resolution,
1140     // etc), but not recursive entry into call_class_initializer().
1141     PerfClassTraceTime timer(ClassLoader::perf_class_init_time(),
1142                              ClassLoader::perf_class_init_selftime(),
1143                              ClassLoader::perf_classes_inited(),
1144                              jt->get_thread_stat()->perf_recursion_counts_addr(),
1145                              jt->get_thread_stat()->perf_timers_addr(),
1146                              PerfClassTraceTime::CLASS_CLINIT);
1147     call_class_initializer(THREAD);
1148   }
1149 
1150   // Step 10
1151   if (!HAS_PENDING_EXCEPTION) {
1152     set_initialization_state_and_notify(fully_initialized, CHECK);
1153     {
1154       debug_only(vtable().verify(tty, true);)
1155     }
1156   }
1157   else {
1158     // Step 11 and 12
1159     Handle e(THREAD, PENDING_EXCEPTION);
1160     CLEAR_PENDING_EXCEPTION;
1161     // JVMTI has already reported the pending exception
1162     // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
1163     JvmtiExport::clear_detected_exception(jt);
1164     {
1165       EXCEPTION_MARK;
1166       set_initialization_state_and_notify(initialization_error, THREAD);
1167       CLEAR_PENDING_EXCEPTION;   // ignore any exception thrown, class initialization error is thrown below
1168       // JVMTI has already reported the pending exception
1169       // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
1170       JvmtiExport::clear_detected_exception(jt);
1171     }
1172     DTRACE_CLASSINIT_PROBE_WAIT(error, -1, wait);
1173     if (e->is_a(SystemDictionary::Error_klass())) {
1174       THROW_OOP(e());
1175     } else {
1176       JavaCallArguments args(e);
1177       THROW_ARG(vmSymbols::java_lang_ExceptionInInitializerError(),
1178                 vmSymbols::throwable_void_signature(),
1179                 &args);
1180     }
1181   }
1182   DTRACE_CLASSINIT_PROBE_WAIT(end, -1, wait);
1183 }
1184 
1185 
1186 void InstanceKlass::set_initialization_state_and_notify(ClassState state, TRAPS) {
1187   Handle h_init_lock(THREAD, init_lock());
1188   if (h_init_lock() != NULL) {
1189     ObjectLocker ol(h_init_lock, THREAD);
1190     set_init_thread(NULL); // reset _init_thread before changing _init_state
1191     set_init_state(state);
1192     fence_and_clear_init_lock();
1193     ol.notify_all(CHECK);
1194   } else {
1195     assert(h_init_lock() != NULL, "The initialization state should never be set twice");
1196     set_init_thread(NULL); // reset _init_thread before changing _init_state
1197     set_init_state(state);
1198   }
1199 }
1200 
1201 Klass* InstanceKlass::implementor() const {
1202   Klass* volatile* k = adr_implementor();
1203   if (k == NULL) {
1204     return NULL;
1205   } else {
1206     // This load races with inserts, and therefore needs acquire.
1207     Klass* kls = OrderAccess::load_acquire(k);
1208     if (kls != NULL && !kls->is_loader_alive()) {
1209       return NULL;  // don't return unloaded class
1210     } else {
1211       return kls;
1212     }
1213   }
1214 }
1215 
1216 
1217 void InstanceKlass::set_implementor(Klass* k) {
1218   assert_lock_strong(Compile_lock);
1219   assert(is_interface(), "not interface");
1220   Klass* volatile* addr = adr_implementor();
1221   assert(addr != NULL, "null addr");
1222   if (addr != NULL) {
1223     OrderAccess::release_store(addr, k);
1224   }
1225 }
1226 
1227 int  InstanceKlass::nof_implementors() const {
1228   Klass* k = implementor();
1229   if (k == NULL) {
1230     return 0;
1231   } else if (k != this) {
1232     return 1;
1233   } else {
1234     return 2;
1235   }
1236 }
1237 
1238 // The embedded _implementor field can only record one implementor.
1239 // When there are more than one implementors, the _implementor field
1240 // is set to the interface Klass* itself. Following are the possible
1241 // values for the _implementor field:
1242 //   NULL                  - no implementor
1243 //   implementor Klass*    - one implementor
1244 //   self                  - more than one implementor
1245 //
1246 // The _implementor field only exists for interfaces.
1247 void InstanceKlass::add_implementor(Klass* k) {
1248   assert_lock_strong(Compile_lock);
1249   assert(is_interface(), "not interface");
1250   // Filter out my subinterfaces.
1251   // (Note: Interfaces are never on the subklass list.)
1252   if (InstanceKlass::cast(k)->is_interface()) return;
1253 
1254   // Filter out subclasses whose supers already implement me.
1255   // (Note: CHA must walk subclasses of direct implementors
1256   // in order to locate indirect implementors.)
1257   Klass* sk = k->super();
1258   if (sk != NULL && InstanceKlass::cast(sk)->implements_interface(this))
1259     // We only need to check one immediate superclass, since the
1260     // implements_interface query looks at transitive_interfaces.
1261     // Any supers of the super have the same (or fewer) transitive_interfaces.
1262     return;
1263 
1264   Klass* ik = implementor();
1265   if (ik == NULL) {
1266     set_implementor(k);
1267   } else if (ik != this) {
1268     // There is already an implementor. Use itself as an indicator of
1269     // more than one implementors.
1270     set_implementor(this);
1271   }
1272 
1273   // The implementor also implements the transitive_interfaces
1274   for (int index = 0; index < local_interfaces()->length(); index++) {
1275     InstanceKlass::cast(local_interfaces()->at(index))->add_implementor(k);
1276   }
1277 }
1278 
1279 void InstanceKlass::init_implementor() {
1280   if (is_interface()) {
1281     set_implementor(NULL);
1282   }
1283 }
1284 
1285 
1286 void InstanceKlass::process_interfaces(Thread *thread) {
1287   // link this class into the implementors list of every interface it implements
1288   for (int i = local_interfaces()->length() - 1; i >= 0; i--) {
1289     assert(local_interfaces()->at(i)->is_klass(), "must be a klass");
1290     InstanceKlass* interf = InstanceKlass::cast(local_interfaces()->at(i));
1291     assert(interf->is_interface(), "expected interface");
1292     interf->add_implementor(this);
1293   }
1294 }
1295 
1296 bool InstanceKlass::can_be_primary_super_slow() const {
1297   if (is_interface())
1298     return false;
1299   else
1300     return Klass::can_be_primary_super_slow();
1301 }
1302 
1303 GrowableArray<Klass*>* InstanceKlass::compute_secondary_supers(int num_extra_slots,
1304                                                                Array<InstanceKlass*>* transitive_interfaces) {
1305   // The secondaries are the implemented interfaces.
1306   Array<InstanceKlass*>* interfaces = transitive_interfaces;
1307   int num_secondaries = num_extra_slots + interfaces->length();
1308   if (num_secondaries == 0) {
1309     // Must share this for correct bootstrapping!
1310     set_secondary_supers(Universe::the_empty_klass_array());
1311     return NULL;
1312   } else if (num_extra_slots == 0) {
1313     // The secondary super list is exactly the same as the transitive interfaces, so
1314     // let's use it instead of making a copy.
1315     // Redefine classes has to be careful not to delete this!
1316     // We need the cast because Array<Klass*> is NOT a supertype of Array<InstanceKlass*>,
1317     // (but it's safe to do here because we won't write into _secondary_supers from this point on).
1318     set_secondary_supers((Array<Klass*>*)(address)interfaces);
1319     return NULL;
1320   } else {
1321     // Copy transitive interfaces to a temporary growable array to be constructed
1322     // into the secondary super list with extra slots.
1323     GrowableArray<Klass*>* secondaries = new GrowableArray<Klass*>(interfaces->length());
1324     for (int i = 0; i < interfaces->length(); i++) {
1325       secondaries->push(interfaces->at(i));
1326     }
1327     return secondaries;
1328   }
1329 }
1330 
1331 bool InstanceKlass::implements_interface(Klass* k) const {
1332   if (this == k) return true;
1333   assert(k->is_interface(), "should be an interface class");
1334   for (int i = 0; i < transitive_interfaces()->length(); i++) {
1335     if (transitive_interfaces()->at(i) == k) {
1336       return true;
1337     }
1338   }
1339   return false;
1340 }
1341 
1342 bool InstanceKlass::is_same_or_direct_interface(Klass *k) const {
1343   // Verify direct super interface
1344   if (this == k) return true;
1345   assert(k->is_interface(), "should be an interface class");
1346   for (int i = 0; i < local_interfaces()->length(); i++) {
1347     if (local_interfaces()->at(i) == k) {
1348       return true;
1349     }
1350   }
1351   return false;
1352 }
1353 
1354 objArrayOop InstanceKlass::allocate_objArray(int n, int length, TRAPS) {
1355   check_array_allocation_length(length, arrayOopDesc::max_array_length(T_OBJECT), CHECK_NULL);
1356   int size = objArrayOopDesc::object_size(length);
1357   Klass* ak = array_klass(n, CHECK_NULL);
1358   objArrayOop o = (objArrayOop)Universe::heap()->array_allocate(ak, size, length,
1359                                                                 /* do_zero */ true, CHECK_NULL);
1360   return o;
1361 }
1362 
1363 instanceOop InstanceKlass::register_finalizer(instanceOop i, TRAPS) {
1364   if (TraceFinalizerRegistration) {
1365     tty->print("Registered ");
1366     i->print_value_on(tty);
1367     tty->print_cr(" (" INTPTR_FORMAT ") as finalizable", p2i(i));
1368   }
1369   instanceHandle h_i(THREAD, i);
1370   // Pass the handle as argument, JavaCalls::call expects oop as jobjects
1371   JavaValue result(T_VOID);
1372   JavaCallArguments args(h_i);
1373   methodHandle mh (THREAD, Universe::finalizer_register_method());
1374   JavaCalls::call(&result, mh, &args, CHECK_NULL);
1375   return h_i();
1376 }
1377 
1378 instanceOop InstanceKlass::allocate_instance(TRAPS) {
1379   bool has_finalizer_flag = has_finalizer(); // Query before possible GC
1380   int size = size_helper();  // Query before forming handle.
1381 
1382   instanceOop i;
1383 
1384   i = (instanceOop)Universe::heap()->obj_allocate(this, size, CHECK_NULL);
1385   if (has_finalizer_flag && !RegisterFinalizersAtInit) {
1386     i = register_finalizer(i, CHECK_NULL);
1387   }
1388   return i;
1389 }
1390 
1391 instanceHandle InstanceKlass::allocate_instance_handle(TRAPS) {
1392   return instanceHandle(THREAD, allocate_instance(THREAD));
1393 }
1394 
1395 void InstanceKlass::check_valid_for_instantiation(bool throwError, TRAPS) {
1396   if (is_interface() || is_abstract()) {
1397     ResourceMark rm(THREAD);
1398     THROW_MSG(throwError ? vmSymbols::java_lang_InstantiationError()
1399               : vmSymbols::java_lang_InstantiationException(), external_name());
1400   }
1401   if (this == SystemDictionary::Class_klass()) {
1402     ResourceMark rm(THREAD);
1403     THROW_MSG(throwError ? vmSymbols::java_lang_IllegalAccessError()
1404               : vmSymbols::java_lang_IllegalAccessException(), external_name());
1405   }
1406 }
1407 
1408 Klass* InstanceKlass::array_klass_impl(ArrayStorageProperties storage_props, bool or_null, int n, TRAPS) {
1409   assert(storage_props.is_empty(), "Unexpected");
1410   // Need load-acquire for lock-free read
1411   if (array_klasses_acquire() == NULL) {
1412     if (or_null) return NULL;
1413 
1414     ResourceMark rm;
1415     {
1416       // Atomic creation of array_klasses
1417       MutexLocker ma(MultiArray_lock, THREAD);
1418 
1419       // Check if update has already taken place
1420       if (array_klasses() == NULL) {
1421         Klass*    k = ObjArrayKlass::allocate_objArray_klass(storage_props, 1, this, CHECK_NULL);
1422         // use 'release' to pair with lock-free load
1423         release_set_array_klasses(k);
1424       }
1425     }
1426   }
1427   // _this will always be set at this point
1428   ObjArrayKlass* oak = (ObjArrayKlass*)array_klasses();
1429   if (or_null) {
1430     return oak->array_klass_or_null(storage_props, n);
1431   }
1432   return oak->array_klass(storage_props, n, THREAD);
1433 }
1434 
1435 Klass* InstanceKlass::array_klass_impl(ArrayStorageProperties storage_props, bool or_null, TRAPS) {
1436   return array_klass_impl(storage_props, or_null, 1, THREAD);
1437 }
1438 
1439 static int call_class_initializer_counter = 0;   // for debugging
1440 
1441 Method* InstanceKlass::class_initializer() const {
1442   Method* clinit = find_method(
1443       vmSymbols::class_initializer_name(), vmSymbols::void_method_signature());
1444   if (clinit != NULL && clinit->is_class_initializer()) {
1445     return clinit;
1446   }
1447   return NULL;
1448 }
1449 
1450 void InstanceKlass::call_class_initializer(TRAPS) {
1451   if (ReplayCompiles &&
1452       (ReplaySuppressInitializers == 1 ||
1453        (ReplaySuppressInitializers >= 2 && class_loader() != NULL))) {
1454     // Hide the existence of the initializer for the purpose of replaying the compile
1455     return;
1456   }
1457 
1458   methodHandle h_method(THREAD, class_initializer());
1459   assert(!is_initialized(), "we cannot initialize twice");
1460   LogTarget(Info, class, init) lt;
1461   if (lt.is_enabled()) {
1462     ResourceMark rm;
1463     LogStream ls(lt);
1464     ls.print("%d Initializing ", call_class_initializer_counter++);
1465     name()->print_value_on(&ls);
1466     ls.print_cr("%s (" INTPTR_FORMAT ")", h_method() == NULL ? "(no method)" : "", p2i(this));
1467   }
1468   if (h_method() != NULL) {
1469     JavaCallArguments args; // No arguments
1470     JavaValue result(T_VOID);
1471     JavaCalls::call(&result, h_method, &args, CHECK); // Static call (no args)
1472   }
1473 }
1474 
1475 
1476 void InstanceKlass::mask_for(const methodHandle& method, int bci,
1477   InterpreterOopMap* entry_for) {
1478   // Lazily create the _oop_map_cache at first request
1479   // Lock-free access requires load_acquire.
1480   OopMapCache* oop_map_cache = OrderAccess::load_acquire(&_oop_map_cache);
1481   if (oop_map_cache == NULL) {
1482     MutexLocker x(OopMapCacheAlloc_lock,  Mutex::_no_safepoint_check_flag);
1483     // Check if _oop_map_cache was allocated while we were waiting for this lock
1484     if ((oop_map_cache = _oop_map_cache) == NULL) {
1485       oop_map_cache = new OopMapCache();
1486       // Ensure _oop_map_cache is stable, since it is examined without a lock
1487       OrderAccess::release_store(&_oop_map_cache, oop_map_cache);
1488     }
1489   }
1490   // _oop_map_cache is constant after init; lookup below does its own locking.
1491   oop_map_cache->lookup(method, bci, entry_for);
1492 }
1493 
1494 
1495 bool InstanceKlass::find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1496   for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1497     Symbol* f_name = fs.name();
1498     Symbol* f_sig  = fs.signature();
1499     if (f_name == name && f_sig == sig) {
1500       fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index());
1501       return true;
1502     }
1503   }
1504   return false;
1505 }
1506 
1507 
1508 Klass* InstanceKlass::find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1509   const int n = local_interfaces()->length();
1510   for (int i = 0; i < n; i++) {
1511     Klass* intf1 = local_interfaces()->at(i);
1512     assert(intf1->is_interface(), "just checking type");
1513     // search for field in current interface
1514     if (InstanceKlass::cast(intf1)->find_local_field(name, sig, fd)) {
1515       assert(fd->is_static(), "interface field must be static");
1516       return intf1;
1517     }
1518     // search for field in direct superinterfaces
1519     Klass* intf2 = InstanceKlass::cast(intf1)->find_interface_field(name, sig, fd);
1520     if (intf2 != NULL) return intf2;
1521   }
1522   // otherwise field lookup fails
1523   return NULL;
1524 }
1525 
1526 
1527 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1528   // search order according to newest JVM spec (5.4.3.2, p.167).
1529   // 1) search for field in current klass
1530   if (find_local_field(name, sig, fd)) {
1531     return const_cast<InstanceKlass*>(this);
1532   }
1533   // 2) search for field recursively in direct superinterfaces
1534   { Klass* intf = find_interface_field(name, sig, fd);
1535     if (intf != NULL) return intf;
1536   }
1537   // 3) apply field lookup recursively if superclass exists
1538   { Klass* supr = super();
1539     if (supr != NULL) return InstanceKlass::cast(supr)->find_field(name, sig, fd);
1540   }
1541   // 4) otherwise field lookup fails
1542   return NULL;
1543 }
1544 
1545 
1546 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const {
1547   // search order according to newest JVM spec (5.4.3.2, p.167).
1548   // 1) search for field in current klass
1549   if (find_local_field(name, sig, fd)) {
1550     if (fd->is_static() == is_static) return const_cast<InstanceKlass*>(this);
1551   }
1552   // 2) search for field recursively in direct superinterfaces
1553   if (is_static) {
1554     Klass* intf = find_interface_field(name, sig, fd);
1555     if (intf != NULL) return intf;
1556   }
1557   // 3) apply field lookup recursively if superclass exists
1558   { Klass* supr = super();
1559     if (supr != NULL) return InstanceKlass::cast(supr)->find_field(name, sig, is_static, fd);
1560   }
1561   // 4) otherwise field lookup fails
1562   return NULL;
1563 }
1564 
1565 
1566 bool InstanceKlass::find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
1567   for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1568     if (fs.offset() == offset) {
1569       fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index());
1570       if (fd->is_static() == is_static) return true;
1571     }
1572   }
1573   return false;
1574 }
1575 
1576 
1577 bool InstanceKlass::find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
1578   Klass* klass = const_cast<InstanceKlass*>(this);
1579   while (klass != NULL) {
1580     if (InstanceKlass::cast(klass)->find_local_field_from_offset(offset, is_static, fd)) {
1581       return true;
1582     }
1583     klass = klass->super();
1584   }
1585   return false;
1586 }
1587 
1588 
1589 void InstanceKlass::methods_do(void f(Method* method)) {
1590   // Methods aren't stable until they are loaded.  This can be read outside
1591   // a lock through the ClassLoaderData for profiling
1592   if (!is_loaded()) {
1593     return;
1594   }
1595 
1596   int len = methods()->length();
1597   for (int index = 0; index < len; index++) {
1598     Method* m = methods()->at(index);
1599     assert(m->is_method(), "must be method");
1600     f(m);
1601   }
1602 }
1603 
1604 
1605 void InstanceKlass::do_local_static_fields(FieldClosure* cl) {
1606   for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1607     if (fs.access_flags().is_static()) {
1608       fieldDescriptor& fd = fs.field_descriptor();
1609       cl->do_field(&fd);
1610     }
1611   }
1612 }
1613 
1614 
1615 void InstanceKlass::do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle mirror, TRAPS) {
1616   for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1617     if (fs.access_flags().is_static()) {
1618       fieldDescriptor& fd = fs.field_descriptor();
1619       f(&fd, mirror, CHECK);
1620     }
1621   }
1622 }
1623 
1624 
1625 static int compare_fields_by_offset(int* a, int* b) {
1626   return a[0] - b[0];
1627 }
1628 
1629 void InstanceKlass::do_nonstatic_fields(FieldClosure* cl) {
1630   InstanceKlass* super = superklass();
1631   if (super != NULL) {
1632     super->do_nonstatic_fields(cl);
1633   }
1634   fieldDescriptor fd;
1635   int length = java_fields_count();
1636   // In DebugInfo nonstatic fields are sorted by offset.
1637   int* fields_sorted = NEW_C_HEAP_ARRAY(int, 2*(length+1), mtClass);
1638   int j = 0;
1639   for (int i = 0; i < length; i += 1) {
1640     fd.reinitialize(this, i);
1641     if (!fd.is_static()) {
1642       fields_sorted[j + 0] = fd.offset();
1643       fields_sorted[j + 1] = i;
1644       j += 2;
1645     }
1646   }
1647   if (j > 0) {
1648     length = j;
1649     // _sort_Fn is defined in growableArray.hpp.
1650     qsort(fields_sorted, length/2, 2*sizeof(int), (_sort_Fn)compare_fields_by_offset);
1651     for (int i = 0; i < length; i += 2) {
1652       fd.reinitialize(this, fields_sorted[i + 1]);
1653       assert(!fd.is_static() && fd.offset() == fields_sorted[i], "only nonstatic fields");
1654       cl->do_field(&fd);
1655     }
1656   }
1657   FREE_C_HEAP_ARRAY(int, fields_sorted);
1658 }
1659 
1660 
1661 void InstanceKlass::array_klasses_do(void f(Klass* k)) {
1662   if (array_klasses() != NULL)
1663     ArrayKlass::cast(array_klasses())->array_klasses_do(f);
1664 }
1665 
1666 #ifdef ASSERT
1667 static int linear_search(const Array<Method*>* methods,
1668                          const Symbol* name,
1669                          const Symbol* signature) {
1670   const int len = methods->length();
1671   for (int index = 0; index < len; index++) {
1672     const Method* const m = methods->at(index);
1673     assert(m->is_method(), "must be method");
1674     if (m->signature() == signature && m->name() == name) {
1675        return index;
1676     }
1677   }
1678   return -1;
1679 }
1680 #endif
1681 
1682 static int binary_search(const Array<Method*>* methods, const Symbol* name) {
1683   int len = methods->length();
1684   // methods are sorted, so do binary search
1685   int l = 0;
1686   int h = len - 1;
1687   while (l <= h) {
1688     int mid = (l + h) >> 1;
1689     Method* m = methods->at(mid);
1690     assert(m->is_method(), "must be method");
1691     int res = m->name()->fast_compare(name);
1692     if (res == 0) {
1693       return mid;
1694     } else if (res < 0) {
1695       l = mid + 1;
1696     } else {
1697       h = mid - 1;
1698     }
1699   }
1700   return -1;
1701 }
1702 
1703 // find_method looks up the name/signature in the local methods array
1704 Method* InstanceKlass::find_method(const Symbol* name,
1705                                    const Symbol* signature) const {
1706   return find_method_impl(name, signature, find_overpass, find_static, find_private);
1707 }
1708 
1709 Method* InstanceKlass::find_method_impl(const Symbol* name,
1710                                         const Symbol* signature,
1711                                         OverpassLookupMode overpass_mode,
1712                                         StaticLookupMode static_mode,
1713                                         PrivateLookupMode private_mode) const {
1714   return InstanceKlass::find_method_impl(methods(),
1715                                          name,
1716                                          signature,
1717                                          overpass_mode,
1718                                          static_mode,
1719                                          private_mode);
1720 }
1721 
1722 // find_instance_method looks up the name/signature in the local methods array
1723 // and skips over static methods
1724 Method* InstanceKlass::find_instance_method(const Array<Method*>* methods,
1725                                             const Symbol* name,
1726                                             const Symbol* signature,
1727                                             PrivateLookupMode private_mode) {
1728   Method* const meth = InstanceKlass::find_method_impl(methods,
1729                                                  name,
1730                                                  signature,
1731                                                  find_overpass,
1732                                                  skip_static,
1733                                                  private_mode);
1734   assert(((meth == NULL) || !meth->is_static()),
1735     "find_instance_method should have skipped statics");
1736   return meth;
1737 }
1738 
1739 // find_instance_method looks up the name/signature in the local methods array
1740 // and skips over static methods
1741 Method* InstanceKlass::find_instance_method(const Symbol* name,
1742                                             const Symbol* signature,
1743                                             PrivateLookupMode private_mode) const {
1744   return InstanceKlass::find_instance_method(methods(), name, signature, private_mode);
1745 }
1746 
1747 // Find looks up the name/signature in the local methods array
1748 // and filters on the overpass, static and private flags
1749 // This returns the first one found
1750 // note that the local methods array can have up to one overpass, one static
1751 // and one instance (private or not) with the same name/signature
1752 Method* InstanceKlass::find_local_method(const Symbol* name,
1753                                          const Symbol* signature,
1754                                          OverpassLookupMode overpass_mode,
1755                                          StaticLookupMode static_mode,
1756                                          PrivateLookupMode private_mode) const {
1757   return InstanceKlass::find_method_impl(methods(),
1758                                          name,
1759                                          signature,
1760                                          overpass_mode,
1761                                          static_mode,
1762                                          private_mode);
1763 }
1764 
1765 // Find looks up the name/signature in the local methods array
1766 // and filters on the overpass, static and private flags
1767 // This returns the first one found
1768 // note that the local methods array can have up to one overpass, one static
1769 // and one instance (private or not) with the same name/signature
1770 Method* InstanceKlass::find_local_method(const Array<Method*>* methods,
1771                                          const Symbol* name,
1772                                          const Symbol* signature,
1773                                          OverpassLookupMode overpass_mode,
1774                                          StaticLookupMode static_mode,
1775                                          PrivateLookupMode private_mode) {
1776   return InstanceKlass::find_method_impl(methods,
1777                                          name,
1778                                          signature,
1779                                          overpass_mode,
1780                                          static_mode,
1781                                          private_mode);
1782 }
1783 
1784 Method* InstanceKlass::find_method(const Array<Method*>* methods,
1785                                    const Symbol* name,
1786                                    const Symbol* signature) {
1787   return InstanceKlass::find_method_impl(methods,
1788                                          name,
1789                                          signature,
1790                                          find_overpass,
1791                                          find_static,
1792                                          find_private);
1793 }
1794 
1795 Method* InstanceKlass::find_method_impl(const Array<Method*>* methods,
1796                                         const Symbol* name,
1797                                         const Symbol* signature,
1798                                         OverpassLookupMode overpass_mode,
1799                                         StaticLookupMode static_mode,
1800                                         PrivateLookupMode private_mode) {
1801   int hit = find_method_index(methods, name, signature, overpass_mode, static_mode, private_mode);
1802   return hit >= 0 ? methods->at(hit): NULL;
1803 }
1804 
1805 // true if method matches signature and conforms to skipping_X conditions.
1806 static bool method_matches(const Method* m,
1807                            const Symbol* signature,
1808                            bool skipping_overpass,
1809                            bool skipping_static,
1810                            bool skipping_private) {
1811   return ((m->signature() == signature) &&
1812     (!skipping_overpass || !m->is_overpass()) &&
1813     (!skipping_static || !m->is_static()) &&
1814     (!skipping_private || !m->is_private()));
1815 }
1816 
1817 // Used directly for default_methods to find the index into the
1818 // default_vtable_indices, and indirectly by find_method
1819 // find_method_index looks in the local methods array to return the index
1820 // of the matching name/signature. If, overpass methods are being ignored,
1821 // the search continues to find a potential non-overpass match.  This capability
1822 // is important during method resolution to prefer a static method, for example,
1823 // over an overpass method.
1824 // There is the possibility in any _method's array to have the same name/signature
1825 // for a static method, an overpass method and a local instance method
1826 // To correctly catch a given method, the search criteria may need
1827 // to explicitly skip the other two. For local instance methods, it
1828 // is often necessary to skip private methods
1829 int InstanceKlass::find_method_index(const Array<Method*>* methods,
1830                                      const Symbol* name,
1831                                      const Symbol* signature,
1832                                      OverpassLookupMode overpass_mode,
1833                                      StaticLookupMode static_mode,
1834                                      PrivateLookupMode private_mode) {
1835   const bool skipping_overpass = (overpass_mode == skip_overpass);
1836   const bool skipping_static = (static_mode == skip_static);
1837   const bool skipping_private = (private_mode == skip_private);
1838   const int hit = binary_search(methods, name);
1839   if (hit != -1) {
1840     const Method* const m = methods->at(hit);
1841 
1842     // Do linear search to find matching signature.  First, quick check
1843     // for common case, ignoring overpasses if requested.
1844     if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
1845       return hit;
1846     }
1847 
1848     // search downwards through overloaded methods
1849     int i;
1850     for (i = hit - 1; i >= 0; --i) {
1851         const Method* const m = methods->at(i);
1852         assert(m->is_method(), "must be method");
1853         if (m->name() != name) {
1854           break;
1855         }
1856         if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
1857           return i;
1858         }
1859     }
1860     // search upwards
1861     for (i = hit + 1; i < methods->length(); ++i) {
1862         const Method* const m = methods->at(i);
1863         assert(m->is_method(), "must be method");
1864         if (m->name() != name) {
1865           break;
1866         }
1867         if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
1868           return i;
1869         }
1870     }
1871     // not found
1872 #ifdef ASSERT
1873     const int index = (skipping_overpass || skipping_static || skipping_private) ? -1 :
1874       linear_search(methods, name, signature);
1875     assert(-1 == index, "binary search should have found entry %d", index);
1876 #endif
1877   }
1878   return -1;
1879 }
1880 
1881 int InstanceKlass::find_method_by_name(const Symbol* name, int* end) const {
1882   return find_method_by_name(methods(), name, end);
1883 }
1884 
1885 int InstanceKlass::find_method_by_name(const Array<Method*>* methods,
1886                                        const Symbol* name,
1887                                        int* end_ptr) {
1888   assert(end_ptr != NULL, "just checking");
1889   int start = binary_search(methods, name);
1890   int end = start + 1;
1891   if (start != -1) {
1892     while (start - 1 >= 0 && (methods->at(start - 1))->name() == name) --start;
1893     while (end < methods->length() && (methods->at(end))->name() == name) ++end;
1894     *end_ptr = end;
1895     return start;
1896   }
1897   return -1;
1898 }
1899 
1900 // uncached_lookup_method searches both the local class methods array and all
1901 // superclasses methods arrays, skipping any overpass methods in superclasses,
1902 // and possibly skipping private methods.
1903 Method* InstanceKlass::uncached_lookup_method(const Symbol* name,
1904                                               const Symbol* signature,
1905                                               OverpassLookupMode overpass_mode,
1906                                               PrivateLookupMode private_mode) const {
1907   OverpassLookupMode overpass_local_mode = overpass_mode;
1908   const Klass* klass = this;
1909   while (klass != NULL) {
1910     Method* const method = InstanceKlass::cast(klass)->find_method_impl(name,
1911                                                                         signature,
1912                                                                         overpass_local_mode,
1913                                                                         find_static,
1914                                                                         private_mode);
1915     if (method != NULL) {
1916       return method;
1917     }
1918     if (name == vmSymbols::object_initializer_name()) {
1919       break;  // <init> is never inherited, not even as a static factory
1920     }
1921     klass = klass->super();
1922     overpass_local_mode = skip_overpass;   // Always ignore overpass methods in superclasses
1923   }
1924   return NULL;
1925 }
1926 
1927 #ifdef ASSERT
1928 // search through class hierarchy and return true if this class or
1929 // one of the superclasses was redefined
1930 bool InstanceKlass::has_redefined_this_or_super() const {
1931   const Klass* klass = this;
1932   while (klass != NULL) {
1933     if (InstanceKlass::cast(klass)->has_been_redefined()) {
1934       return true;
1935     }
1936     klass = klass->super();
1937   }
1938   return false;
1939 }
1940 #endif
1941 
1942 // lookup a method in the default methods list then in all transitive interfaces
1943 // Do NOT return private or static methods
1944 Method* InstanceKlass::lookup_method_in_ordered_interfaces(Symbol* name,
1945                                                          Symbol* signature) const {
1946   Method* m = NULL;
1947   if (default_methods() != NULL) {
1948     m = find_method(default_methods(), name, signature);
1949   }
1950   // Look up interfaces
1951   if (m == NULL) {
1952     m = lookup_method_in_all_interfaces(name, signature, find_defaults);
1953   }
1954   return m;
1955 }
1956 
1957 // lookup a method in all the interfaces that this class implements
1958 // Do NOT return private or static methods, new in JDK8 which are not externally visible
1959 // They should only be found in the initial InterfaceMethodRef
1960 Method* InstanceKlass::lookup_method_in_all_interfaces(Symbol* name,
1961                                                        Symbol* signature,
1962                                                        DefaultsLookupMode defaults_mode) const {
1963   Array<InstanceKlass*>* all_ifs = transitive_interfaces();
1964   int num_ifs = all_ifs->length();
1965   InstanceKlass *ik = NULL;
1966   for (int i = 0; i < num_ifs; i++) {
1967     ik = all_ifs->at(i);
1968     Method* m = ik->lookup_method(name, signature);
1969     if (m != NULL && m->is_public() && !m->is_static() &&
1970         ((defaults_mode != skip_defaults) || !m->is_default_method())) {
1971       return m;
1972     }
1973   }
1974   return NULL;
1975 }
1976 
1977 /* jni_id_for_impl for jfieldIds only */
1978 JNIid* InstanceKlass::jni_id_for_impl(int offset) {
1979   MutexLocker ml(JfieldIdCreation_lock);
1980   // Retry lookup after we got the lock
1981   JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset);
1982   if (probe == NULL) {
1983     // Slow case, allocate new static field identifier
1984     probe = new JNIid(this, offset, jni_ids());
1985     set_jni_ids(probe);
1986   }
1987   return probe;
1988 }
1989 
1990 
1991 /* jni_id_for for jfieldIds only */
1992 JNIid* InstanceKlass::jni_id_for(int offset) {
1993   JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset);
1994   if (probe == NULL) {
1995     probe = jni_id_for_impl(offset);
1996   }
1997   return probe;
1998 }
1999 
2000 u2 InstanceKlass::enclosing_method_data(int offset) const {
2001   const Array<jushort>* const inner_class_list = inner_classes();
2002   if (inner_class_list == NULL) {
2003     return 0;
2004   }
2005   const int length = inner_class_list->length();
2006   if (length % inner_class_next_offset == 0) {
2007     return 0;
2008   }
2009   const int index = length - enclosing_method_attribute_size;
2010   assert(offset < enclosing_method_attribute_size, "invalid offset");
2011   return inner_class_list->at(index + offset);
2012 }
2013 
2014 void InstanceKlass::set_enclosing_method_indices(u2 class_index,
2015                                                  u2 method_index) {
2016   Array<jushort>* inner_class_list = inner_classes();
2017   assert (inner_class_list != NULL, "_inner_classes list is not set up");
2018   int length = inner_class_list->length();
2019   if (length % inner_class_next_offset == enclosing_method_attribute_size) {
2020     int index = length - enclosing_method_attribute_size;
2021     inner_class_list->at_put(
2022       index + enclosing_method_class_index_offset, class_index);
2023     inner_class_list->at_put(
2024       index + enclosing_method_method_index_offset, method_index);
2025   }
2026 }
2027 
2028 // Lookup or create a jmethodID.
2029 // This code is called by the VMThread and JavaThreads so the
2030 // locking has to be done very carefully to avoid deadlocks
2031 // and/or other cache consistency problems.
2032 //
2033 jmethodID InstanceKlass::get_jmethod_id(const methodHandle& method_h) {
2034   size_t idnum = (size_t)method_h->method_idnum();
2035   jmethodID* jmeths = methods_jmethod_ids_acquire();
2036   size_t length = 0;
2037   jmethodID id = NULL;
2038 
2039   // We use a double-check locking idiom here because this cache is
2040   // performance sensitive. In the normal system, this cache only
2041   // transitions from NULL to non-NULL which is safe because we use
2042   // release_set_methods_jmethod_ids() to advertise the new cache.
2043   // A partially constructed cache should never be seen by a racing
2044   // thread. We also use release_store() to save a new jmethodID
2045   // in the cache so a partially constructed jmethodID should never be
2046   // seen either. Cache reads of existing jmethodIDs proceed without a
2047   // lock, but cache writes of a new jmethodID requires uniqueness and
2048   // creation of the cache itself requires no leaks so a lock is
2049   // generally acquired in those two cases.
2050   //
2051   // If the RedefineClasses() API has been used, then this cache can
2052   // grow and we'll have transitions from non-NULL to bigger non-NULL.
2053   // Cache creation requires no leaks and we require safety between all
2054   // cache accesses and freeing of the old cache so a lock is generally
2055   // acquired when the RedefineClasses() API has been used.
2056 
2057   if (jmeths != NULL) {
2058     // the cache already exists
2059     if (!idnum_can_increment()) {
2060       // the cache can't grow so we can just get the current values
2061       get_jmethod_id_length_value(jmeths, idnum, &length, &id);
2062     } else {
2063       // cache can grow so we have to be more careful
2064       if (Threads::number_of_threads() == 0 ||
2065           SafepointSynchronize::is_at_safepoint()) {
2066         // we're single threaded or at a safepoint - no locking needed
2067         get_jmethod_id_length_value(jmeths, idnum, &length, &id);
2068       } else {
2069         MutexLocker ml(JmethodIdCreation_lock);
2070         get_jmethod_id_length_value(jmeths, idnum, &length, &id);
2071       }
2072     }
2073   }
2074   // implied else:
2075   // we need to allocate a cache so default length and id values are good
2076 
2077   if (jmeths == NULL ||   // no cache yet
2078       length <= idnum ||  // cache is too short
2079       id == NULL) {       // cache doesn't contain entry
2080 
2081     // This function can be called by the VMThread so we have to do all
2082     // things that might block on a safepoint before grabbing the lock.
2083     // Otherwise, we can deadlock with the VMThread or have a cache
2084     // consistency issue. These vars keep track of what we might have
2085     // to free after the lock is dropped.
2086     jmethodID  to_dealloc_id     = NULL;
2087     jmethodID* to_dealloc_jmeths = NULL;
2088 
2089     // may not allocate new_jmeths or use it if we allocate it
2090     jmethodID* new_jmeths = NULL;
2091     if (length <= idnum) {
2092       // allocate a new cache that might be used
2093       size_t size = MAX2(idnum+1, (size_t)idnum_allocated_count());
2094       new_jmeths = NEW_C_HEAP_ARRAY(jmethodID, size+1, mtClass);
2095       memset(new_jmeths, 0, (size+1)*sizeof(jmethodID));
2096       // cache size is stored in element[0], other elements offset by one
2097       new_jmeths[0] = (jmethodID)size;
2098     }
2099 
2100     // allocate a new jmethodID that might be used
2101     jmethodID new_id = NULL;
2102     if (method_h->is_old() && !method_h->is_obsolete()) {
2103       // The method passed in is old (but not obsolete), we need to use the current version
2104       Method* current_method = method_with_idnum((int)idnum);
2105       assert(current_method != NULL, "old and but not obsolete, so should exist");
2106       new_id = Method::make_jmethod_id(class_loader_data(), current_method);
2107     } else {
2108       // It is the current version of the method or an obsolete method,
2109       // use the version passed in
2110       new_id = Method::make_jmethod_id(class_loader_data(), method_h());
2111     }
2112 
2113     if (Threads::number_of_threads() == 0 ||
2114         SafepointSynchronize::is_at_safepoint()) {
2115       // we're single threaded or at a safepoint - no locking needed
2116       id = get_jmethod_id_fetch_or_update(idnum, new_id, new_jmeths,
2117                                           &to_dealloc_id, &to_dealloc_jmeths);
2118     } else {
2119       MutexLocker ml(JmethodIdCreation_lock);
2120       id = get_jmethod_id_fetch_or_update(idnum, new_id, new_jmeths,
2121                                           &to_dealloc_id, &to_dealloc_jmeths);
2122     }
2123 
2124     // The lock has been dropped so we can free resources.
2125     // Free up either the old cache or the new cache if we allocated one.
2126     if (to_dealloc_jmeths != NULL) {
2127       FreeHeap(to_dealloc_jmeths);
2128     }
2129     // free up the new ID since it wasn't needed
2130     if (to_dealloc_id != NULL) {
2131       Method::destroy_jmethod_id(class_loader_data(), to_dealloc_id);
2132     }
2133   }
2134   return id;
2135 }
2136 
2137 // Figure out how many jmethodIDs haven't been allocated, and make
2138 // sure space for them is pre-allocated.  This makes getting all
2139 // method ids much, much faster with classes with more than 8
2140 // methods, and has a *substantial* effect on performance with jvmti
2141 // code that loads all jmethodIDs for all classes.
2142 void InstanceKlass::ensure_space_for_methodids(int start_offset) {
2143   int new_jmeths = 0;
2144   int length = methods()->length();
2145   for (int index = start_offset; index < length; index++) {
2146     Method* m = methods()->at(index);
2147     jmethodID id = m->find_jmethod_id_or_null();
2148     if (id == NULL) {
2149       new_jmeths++;
2150     }
2151   }
2152   if (new_jmeths != 0) {
2153     Method::ensure_jmethod_ids(class_loader_data(), new_jmeths);
2154   }
2155 }
2156 
2157 // Common code to fetch the jmethodID from the cache or update the
2158 // cache with the new jmethodID. This function should never do anything
2159 // that causes the caller to go to a safepoint or we can deadlock with
2160 // the VMThread or have cache consistency issues.
2161 //
2162 jmethodID InstanceKlass::get_jmethod_id_fetch_or_update(
2163             size_t idnum, jmethodID new_id,
2164             jmethodID* new_jmeths, jmethodID* to_dealloc_id_p,
2165             jmethodID** to_dealloc_jmeths_p) {
2166   assert(new_id != NULL, "sanity check");
2167   assert(to_dealloc_id_p != NULL, "sanity check");
2168   assert(to_dealloc_jmeths_p != NULL, "sanity check");
2169   assert(Threads::number_of_threads() == 0 ||
2170          SafepointSynchronize::is_at_safepoint() ||
2171          JmethodIdCreation_lock->owned_by_self(), "sanity check");
2172 
2173   // reacquire the cache - we are locked, single threaded or at a safepoint
2174   jmethodID* jmeths = methods_jmethod_ids_acquire();
2175   jmethodID  id     = NULL;
2176   size_t     length = 0;
2177 
2178   if (jmeths == NULL ||                         // no cache yet
2179       (length = (size_t)jmeths[0]) <= idnum) {  // cache is too short
2180     if (jmeths != NULL) {
2181       // copy any existing entries from the old cache
2182       for (size_t index = 0; index < length; index++) {
2183         new_jmeths[index+1] = jmeths[index+1];
2184       }
2185       *to_dealloc_jmeths_p = jmeths;  // save old cache for later delete
2186     }
2187     release_set_methods_jmethod_ids(jmeths = new_jmeths);
2188   } else {
2189     // fetch jmethodID (if any) from the existing cache
2190     id = jmeths[idnum+1];
2191     *to_dealloc_jmeths_p = new_jmeths;  // save new cache for later delete
2192   }
2193   if (id == NULL) {
2194     // No matching jmethodID in the existing cache or we have a new
2195     // cache or we just grew the cache. This cache write is done here
2196     // by the first thread to win the foot race because a jmethodID
2197     // needs to be unique once it is generally available.
2198     id = new_id;
2199 
2200     // The jmethodID cache can be read while unlocked so we have to
2201     // make sure the new jmethodID is complete before installing it
2202     // in the cache.
2203     OrderAccess::release_store(&jmeths[idnum+1], id);
2204   } else {
2205     *to_dealloc_id_p = new_id; // save new id for later delete
2206   }
2207   return id;
2208 }
2209 
2210 
2211 // Common code to get the jmethodID cache length and the jmethodID
2212 // value at index idnum if there is one.
2213 //
2214 void InstanceKlass::get_jmethod_id_length_value(jmethodID* cache,
2215        size_t idnum, size_t *length_p, jmethodID* id_p) {
2216   assert(cache != NULL, "sanity check");
2217   assert(length_p != NULL, "sanity check");
2218   assert(id_p != NULL, "sanity check");
2219 
2220   // cache size is stored in element[0], other elements offset by one
2221   *length_p = (size_t)cache[0];
2222   if (*length_p <= idnum) {  // cache is too short
2223     *id_p = NULL;
2224   } else {
2225     *id_p = cache[idnum+1];  // fetch jmethodID (if any)
2226   }
2227 }
2228 
2229 
2230 // Lookup a jmethodID, NULL if not found.  Do no blocking, no allocations, no handles
2231 jmethodID InstanceKlass::jmethod_id_or_null(Method* method) {
2232   size_t idnum = (size_t)method->method_idnum();
2233   jmethodID* jmeths = methods_jmethod_ids_acquire();
2234   size_t length;                                // length assigned as debugging crumb
2235   jmethodID id = NULL;
2236   if (jmeths != NULL &&                         // If there is a cache
2237       (length = (size_t)jmeths[0]) > idnum) {   // and if it is long enough,
2238     id = jmeths[idnum+1];                       // Look up the id (may be NULL)
2239   }
2240   return id;
2241 }
2242 
2243 inline DependencyContext InstanceKlass::dependencies() {
2244   DependencyContext dep_context(&_dep_context, &_dep_context_last_cleaned);
2245   return dep_context;
2246 }
2247 
2248 int InstanceKlass::mark_dependent_nmethods(KlassDepChange& changes) {
2249   return dependencies().mark_dependent_nmethods(changes);
2250 }
2251 
2252 void InstanceKlass::add_dependent_nmethod(nmethod* nm) {
2253   dependencies().add_dependent_nmethod(nm);
2254 }
2255 
2256 void InstanceKlass::remove_dependent_nmethod(nmethod* nm) {
2257   dependencies().remove_dependent_nmethod(nm);
2258 }
2259 
2260 void InstanceKlass::clean_dependency_context() {
2261   dependencies().clean_unloading_dependents();
2262 }
2263 
2264 #ifndef PRODUCT
2265 void InstanceKlass::print_dependent_nmethods(bool verbose) {
2266   dependencies().print_dependent_nmethods(verbose);
2267 }
2268 
2269 bool InstanceKlass::is_dependent_nmethod(nmethod* nm) {
2270   return dependencies().is_dependent_nmethod(nm);
2271 }
2272 #endif //PRODUCT
2273 
2274 void InstanceKlass::clean_weak_instanceklass_links() {
2275   clean_implementors_list();
2276   clean_method_data();
2277 }
2278 
2279 void InstanceKlass::clean_implementors_list() {
2280   assert(is_loader_alive(), "this klass should be live");
2281   if (is_interface()) {
2282     assert (ClassUnloading, "only called for ClassUnloading");
2283     for (;;) {
2284       // Use load_acquire due to competing with inserts
2285       Klass* impl = OrderAccess::load_acquire(adr_implementor());
2286       if (impl != NULL && !impl->is_loader_alive()) {
2287         // NULL this field, might be an unloaded klass or NULL
2288         Klass* volatile* klass = adr_implementor();
2289         if (Atomic::cmpxchg((Klass*)NULL, klass, impl) == impl) {
2290           // Successfully unlinking implementor.
2291           if (log_is_enabled(Trace, class, unload)) {
2292             ResourceMark rm;
2293             log_trace(class, unload)("unlinking class (implementor): %s", impl->external_name());
2294           }
2295           return;
2296         }
2297       } else {
2298         return;
2299       }
2300     }
2301   }
2302 }
2303 
2304 void InstanceKlass::clean_method_data() {
2305   for (int m = 0; m < methods()->length(); m++) {
2306     MethodData* mdo = methods()->at(m)->method_data();
2307     if (mdo != NULL) {
2308       MutexLocker ml(SafepointSynchronize::is_at_safepoint() ? NULL : mdo->extra_data_lock());
2309       mdo->clean_method_data(/*always_clean*/false);
2310     }
2311   }
2312 }
2313 
2314 bool InstanceKlass::supers_have_passed_fingerprint_checks() {
2315   if (java_super() != NULL && !java_super()->has_passed_fingerprint_check()) {
2316     ResourceMark rm;
2317     log_trace(class, fingerprint)("%s : super %s not fingerprinted", external_name(), java_super()->external_name());
2318     return false;
2319   }
2320 
2321   Array<InstanceKlass*>* local_interfaces = this->local_interfaces();
2322   if (local_interfaces != NULL) {
2323     int length = local_interfaces->length();
2324     for (int i = 0; i < length; i++) {
2325       InstanceKlass* intf = local_interfaces->at(i);
2326       if (!intf->has_passed_fingerprint_check()) {
2327         ResourceMark rm;
2328         log_trace(class, fingerprint)("%s : interface %s not fingerprinted", external_name(), intf->external_name());
2329         return false;
2330       }
2331     }
2332   }
2333 
2334   return true;
2335 }
2336 
2337 bool InstanceKlass::should_store_fingerprint(bool is_unsafe_anonymous) {
2338 #if INCLUDE_AOT
2339   // We store the fingerprint into the InstanceKlass only in the following 2 cases:
2340   if (CalculateClassFingerprint) {
2341     // (1) We are running AOT to generate a shared library.
2342     return true;
2343   }
2344   if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
2345     // (2) We are running -Xshare:dump or -XX:ArchiveClassesAtExit to create a shared archive
2346     return true;
2347   }
2348   if (UseAOT && is_unsafe_anonymous) {
2349     // (3) We are using AOT code from a shared library and see an unsafe anonymous class
2350     return true;
2351   }
2352 #endif
2353 
2354   // In all other cases we might set the _misc_has_passed_fingerprint_check bit,
2355   // but do not store the 64-bit fingerprint to save space.
2356   return false;
2357 }
2358 
2359 bool InstanceKlass::has_stored_fingerprint() const {
2360 #if INCLUDE_AOT
2361   return should_store_fingerprint() || is_shared();
2362 #else
2363   return false;
2364 #endif
2365 }
2366 
2367 uint64_t InstanceKlass::get_stored_fingerprint() const {
2368   address adr = adr_fingerprint();
2369   if (adr != NULL) {
2370     return (uint64_t)Bytes::get_native_u8(adr); // adr may not be 64-bit aligned
2371   }
2372   return 0;
2373 }
2374 
2375 void InstanceKlass::store_fingerprint(uint64_t fingerprint) {
2376   address adr = adr_fingerprint();
2377   if (adr != NULL) {
2378     Bytes::put_native_u8(adr, (u8)fingerprint); // adr may not be 64-bit aligned
2379 
2380     ResourceMark rm;
2381     log_trace(class, fingerprint)("stored as " PTR64_FORMAT " for class %s", fingerprint, external_name());
2382   }
2383 }
2384 
2385 void InstanceKlass::metaspace_pointers_do(MetaspaceClosure* it) {
2386   Klass::metaspace_pointers_do(it);
2387 
2388   if (log_is_enabled(Trace, cds)) {
2389     ResourceMark rm;
2390     log_trace(cds)("Iter(InstanceKlass): %p (%s)", this, external_name());
2391   }
2392 
2393   it->push(&_annotations);
2394   it->push((Klass**)&_array_klasses);
2395   it->push(&_constants);
2396   it->push(&_inner_classes);
2397   it->push(&_array_name);
2398 #if INCLUDE_JVMTI
2399   it->push(&_previous_versions);
2400 #endif
2401   it->push(&_methods);
2402   it->push(&_default_methods);
2403   it->push(&_local_interfaces);
2404   it->push(&_transitive_interfaces);
2405   it->push(&_method_ordering);
2406   it->push(&_default_vtable_indices);
2407   it->push(&_fields);
2408 
2409   if (itable_length() > 0) {
2410     itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable();
2411     int method_table_offset_in_words = ioe->offset()/wordSize;
2412     int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words())
2413                          / itableOffsetEntry::size();
2414 
2415     for (int i = 0; i < nof_interfaces; i ++, ioe ++) {
2416       if (ioe->interface_klass() != NULL) {
2417         it->push(ioe->interface_klass_addr());
2418         itableMethodEntry* ime = ioe->first_method_entry(this);
2419         int n = klassItable::method_count_for_interface(ioe->interface_klass());
2420         for (int index = 0; index < n; index ++) {
2421           it->push(ime[index].method_addr());
2422         }
2423       }
2424     }
2425   }
2426 
2427   it->push(&_nest_members);
2428 }
2429 
2430 void InstanceKlass::remove_unshareable_info() {
2431   Klass::remove_unshareable_info();
2432 
2433   if (is_in_error_state()) {
2434     // Classes are attempted to link during dumping and may fail,
2435     // but these classes are still in the dictionary and class list in CLD.
2436     // Check in_error state first because in_error is > linked state, so
2437     // is_linked() is true.
2438     // If there's a linking error, there is nothing else to remove.
2439     return;
2440   }
2441 
2442   // Reset to the 'allocated' state to prevent any premature accessing to
2443   // a shared class at runtime while the class is still being loaded and
2444   // restored. A class' init_state is set to 'loaded' at runtime when it's
2445   // being added to class hierarchy (see SystemDictionary:::add_to_hierarchy()).
2446   _init_state = allocated;
2447 
2448   {
2449     MutexLocker ml(Compile_lock);
2450     init_implementor();
2451   }
2452 
2453   constants()->remove_unshareable_info();
2454 
2455   for (int i = 0; i < methods()->length(); i++) {
2456     Method* m = methods()->at(i);
2457     m->remove_unshareable_info();
2458   }
2459 
2460   // do array classes also.
2461   if (array_klasses() != NULL) {
2462     array_klasses()->remove_unshareable_info();
2463   }
2464 
2465   // These are not allocated from metaspace. They are safe to set to NULL.
2466   _source_debug_extension = NULL;
2467   _dep_context = NULL;
2468   _osr_nmethods_head = NULL;
2469 #if INCLUDE_JVMTI
2470   _breakpoints = NULL;
2471   _previous_versions = NULL;
2472   _cached_class_file = NULL;
2473 #endif
2474 
2475   _init_thread = NULL;
2476   _methods_jmethod_ids = NULL;
2477   _jni_ids = NULL;
2478   _oop_map_cache = NULL;
2479   // clear _nest_host to ensure re-load at runtime
2480   _nest_host = NULL;
2481 }
2482 
2483 void InstanceKlass::remove_java_mirror() {
2484   Klass::remove_java_mirror();
2485 
2486   // do array classes also.
2487   if (array_klasses() != NULL) {
2488     array_klasses()->remove_java_mirror();
2489   }
2490 }
2491 
2492 void InstanceKlass::restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS) {
2493   // SystemDictionary::add_to_hierarchy() sets the init_state to loaded
2494   // before the InstanceKlass is added to the SystemDictionary. Make
2495   // sure the current state is <loaded.
2496   assert(!is_loaded(), "invalid init state");
2497   set_package(loader_data, CHECK);
2498   Klass::restore_unshareable_info(loader_data, protection_domain, CHECK);
2499 
2500   Array<Method*>* methods = this->methods();
2501   int num_methods = methods->length();
2502   for (int index = 0; index < num_methods; ++index) {
2503     methods->at(index)->restore_unshareable_info(CHECK);
2504   }
2505   if (JvmtiExport::has_redefined_a_class()) {
2506     // Reinitialize vtable because RedefineClasses may have changed some
2507     // entries in this vtable for super classes so the CDS vtable might
2508     // point to old or obsolete entries.  RedefineClasses doesn't fix up
2509     // vtables in the shared system dictionary, only the main one.
2510     // It also redefines the itable too so fix that too.
2511     vtable().initialize_vtable(false, CHECK);
2512     itable().initialize_itable(false, CHECK);
2513   }
2514 
2515   // restore constant pool resolved references
2516   constants()->restore_unshareable_info(CHECK);
2517 
2518   if (array_klasses() != NULL) {
2519     // Array classes have null protection domain.
2520     // --> see ArrayKlass::complete_create_array_klass()
2521     array_klasses()->restore_unshareable_info(ClassLoaderData::the_null_class_loader_data(), Handle(), CHECK);
2522   }
2523 }
2524 
2525 // returns true IFF is_in_error_state() has been changed as a result of this call.
2526 bool InstanceKlass::check_sharing_error_state() {
2527   assert(DumpSharedSpaces, "should only be called during dumping");
2528   bool old_state = is_in_error_state();
2529 
2530   if (!is_in_error_state()) {
2531     bool bad = false;
2532     for (InstanceKlass* sup = java_super(); sup; sup = sup->java_super()) {
2533       if (sup->is_in_error_state()) {
2534         bad = true;
2535         break;
2536       }
2537     }
2538     if (!bad) {
2539       Array<InstanceKlass*>* interfaces = transitive_interfaces();
2540       for (int i = 0; i < interfaces->length(); i++) {
2541         InstanceKlass* iface = interfaces->at(i);
2542         if (iface->is_in_error_state()) {
2543           bad = true;
2544           break;
2545         }
2546       }
2547     }
2548 
2549     if (bad) {
2550       set_in_error_state();
2551     }
2552   }
2553 
2554   return (old_state != is_in_error_state());
2555 }
2556 
2557 void InstanceKlass::set_class_loader_type(s2 loader_type) {
2558   switch (loader_type) {
2559   case ClassLoader::BOOT_LOADER:
2560     _misc_flags |= _misc_is_shared_boot_class;
2561     break;
2562   case ClassLoader::PLATFORM_LOADER:
2563     _misc_flags |= _misc_is_shared_platform_class;
2564     break;
2565   case ClassLoader::APP_LOADER:
2566     _misc_flags |= _misc_is_shared_app_class;
2567     break;
2568   default:
2569     ShouldNotReachHere();
2570     break;
2571   }
2572 }
2573 
2574 #if INCLUDE_JVMTI
2575 static void clear_all_breakpoints(Method* m) {
2576   m->clear_all_breakpoints();
2577 }
2578 #endif
2579 
2580 void InstanceKlass::unload_class(InstanceKlass* ik) {
2581   // Release dependencies.
2582   ik->dependencies().remove_all_dependents();
2583 
2584   // notify the debugger
2585   if (JvmtiExport::should_post_class_unload()) {
2586     JvmtiExport::post_class_unload(ik);
2587   }
2588 
2589   // notify ClassLoadingService of class unload
2590   ClassLoadingService::notify_class_unloaded(ik);
2591 
2592   if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
2593     SystemDictionaryShared::remove_dumptime_info(ik);
2594   }
2595 
2596   if (log_is_enabled(Info, class, unload)) {
2597     ResourceMark rm;
2598     log_info(class, unload)("unloading class %s " INTPTR_FORMAT, ik->external_name(), p2i(ik));
2599   }
2600 
2601   Events::log_class_unloading(Thread::current(), ik);
2602 
2603 #if INCLUDE_JFR
2604   assert(ik != NULL, "invariant");
2605   EventClassUnload event;
2606   event.set_unloadedClass(ik);
2607   event.set_definingClassLoader(ik->class_loader_data());
2608   event.commit();
2609 #endif
2610 }
2611 
2612 void InstanceKlass::release_C_heap_structures(InstanceKlass* ik) {
2613   // Clean up C heap
2614   ik->release_C_heap_structures();
2615   ik->constants()->release_C_heap_structures();
2616 }
2617 
2618 void InstanceKlass::release_C_heap_structures() {
2619   // Can't release the constant pool here because the constant pool can be
2620   // deallocated separately from the InstanceKlass for default methods and
2621   // redefine classes.
2622 
2623   // Deallocate oop map cache
2624   if (_oop_map_cache != NULL) {
2625     delete _oop_map_cache;
2626     _oop_map_cache = NULL;
2627   }
2628 
2629   // Deallocate JNI identifiers for jfieldIDs
2630   JNIid::deallocate(jni_ids());
2631   set_jni_ids(NULL);
2632 
2633   jmethodID* jmeths = methods_jmethod_ids_acquire();
2634   if (jmeths != (jmethodID*)NULL) {
2635     release_set_methods_jmethod_ids(NULL);
2636     FreeHeap(jmeths);
2637   }
2638 
2639   assert(_dep_context == NULL,
2640          "dependencies should already be cleaned");
2641 
2642 #if INCLUDE_JVMTI
2643   // Deallocate breakpoint records
2644   if (breakpoints() != 0x0) {
2645     methods_do(clear_all_breakpoints);
2646     assert(breakpoints() == 0x0, "should have cleared breakpoints");
2647   }
2648 
2649   // deallocate the cached class file
2650   if (_cached_class_file != NULL) {
2651     os::free(_cached_class_file);
2652     _cached_class_file = NULL;
2653   }
2654 #endif
2655 
2656   // Decrement symbol reference counts associated with the unloaded class.
2657   if (_name != NULL) _name->decrement_refcount();
2658   // unreference array name derived from this class name (arrays of an unloaded
2659   // class can't be referenced anymore).
2660   if (_array_name != NULL)  _array_name->decrement_refcount();
2661   if (_value_types != NULL) {
2662     for (int i = 0; i < _value_types->length(); i++) {
2663       Symbol* s = _value_types->at(i)._class_name;
2664       if (s != NULL) {
2665         s->decrement_refcount();
2666       }
2667     }
2668   }
2669   if (_source_debug_extension != NULL) FREE_C_HEAP_ARRAY(char, _source_debug_extension);
2670 }
2671 
2672 void InstanceKlass::set_source_debug_extension(const char* array, int length) {
2673   if (array == NULL) {
2674     _source_debug_extension = NULL;
2675   } else {
2676     // Adding one to the attribute length in order to store a null terminator
2677     // character could cause an overflow because the attribute length is
2678     // already coded with an u4 in the classfile, but in practice, it's
2679     // unlikely to happen.
2680     assert((length+1) > length, "Overflow checking");
2681     char* sde = NEW_C_HEAP_ARRAY(char, (length + 1), mtClass);
2682     for (int i = 0; i < length; i++) {
2683       sde[i] = array[i];
2684     }
2685     sde[length] = '\0';
2686     _source_debug_extension = sde;
2687   }
2688 }
2689 
2690 const char* InstanceKlass::signature_name() const {
2691   return signature_name_of(is_value() ? 'Q' : 'L');
2692 }
2693 
2694 const char* InstanceKlass::signature_name_of(char c) const {
2695   int hash_len = 0;
2696   char hash_buf[40];
2697 
2698   // If this is an unsafe anonymous class, append a hash to make the name unique
2699   if (is_unsafe_anonymous()) {
2700     intptr_t hash = (java_mirror() != NULL) ? java_mirror()->identity_hash() : 0;
2701     jio_snprintf(hash_buf, sizeof(hash_buf), "/" UINTX_FORMAT, (uintx)hash);
2702     hash_len = (int)strlen(hash_buf);
2703   }
2704 
2705   // Get the internal name as a c string
2706   const char* src = (const char*) (name()->as_C_string());
2707   const int src_length = (int)strlen(src);
2708 
2709   char* dest = NEW_RESOURCE_ARRAY(char, src_length + hash_len + 3);
2710 
2711   // Add L or Q as type indicator
2712   int dest_index = 0;
2713   dest[dest_index++] = c;
2714 
2715   // Add the actual class name
2716   for (int src_index = 0; src_index < src_length; ) {
2717     dest[dest_index++] = src[src_index++];
2718   }
2719 
2720   // If we have a hash, append it
2721   for (int hash_index = 0; hash_index < hash_len; ) {
2722     dest[dest_index++] = hash_buf[hash_index++];
2723   }
2724 
2725   // Add the semicolon and the NULL
2726   dest[dest_index++] = ';';
2727   dest[dest_index] = '\0';
2728   return dest;
2729 }
2730 
2731 // Used to obtain the package name from a fully qualified class name.
2732 Symbol* InstanceKlass::package_from_name(const Symbol* name, TRAPS) {
2733   if (name == NULL) {
2734     return NULL;
2735   } else {
2736     if (name->utf8_length() <= 0) {
2737       return NULL;
2738     }
2739     ResourceMark rm;
2740     const char* package_name = ClassLoader::package_from_name((const char*) name->as_C_string());
2741     if (package_name == NULL) {
2742       return NULL;
2743     }
2744     Symbol* pkg_name = SymbolTable::new_symbol(package_name);
2745     return pkg_name;
2746   }
2747 }
2748 
2749 ModuleEntry* InstanceKlass::module() const {
2750   // For an unsafe anonymous class return the host class' module
2751   if (is_unsafe_anonymous()) {
2752     assert(unsafe_anonymous_host() != NULL, "unsafe anonymous class must have a host class");
2753     return unsafe_anonymous_host()->module();
2754   }
2755 
2756   // Class is in a named package
2757   if (!in_unnamed_package()) {
2758     return _package_entry->module();
2759   }
2760 
2761   // Class is in an unnamed package, return its loader's unnamed module
2762   return class_loader_data()->unnamed_module();
2763 }
2764 
2765 void InstanceKlass::set_package(ClassLoaderData* loader_data, TRAPS) {
2766 
2767   // ensure java/ packages only loaded by boot or platform builtin loaders
2768   check_prohibited_package(name(), loader_data, CHECK);
2769 
2770   TempNewSymbol pkg_name = package_from_name(name(), CHECK);
2771 
2772   if (pkg_name != NULL && loader_data != NULL) {
2773 
2774     // Find in class loader's package entry table.
2775     _package_entry = loader_data->packages()->lookup_only(pkg_name);
2776 
2777     // If the package name is not found in the loader's package
2778     // entry table, it is an indication that the package has not
2779     // been defined. Consider it defined within the unnamed module.
2780     if (_package_entry == NULL) {
2781       ResourceMark rm;
2782 
2783       if (!ModuleEntryTable::javabase_defined()) {
2784         // Before java.base is defined during bootstrapping, define all packages in
2785         // the java.base module.  If a non-java.base package is erroneously placed
2786         // in the java.base module it will be caught later when java.base
2787         // is defined by ModuleEntryTable::verify_javabase_packages check.
2788         assert(ModuleEntryTable::javabase_moduleEntry() != NULL, JAVA_BASE_NAME " module is NULL");
2789         _package_entry = loader_data->packages()->lookup(pkg_name, ModuleEntryTable::javabase_moduleEntry());
2790       } else {
2791         assert(loader_data->unnamed_module() != NULL, "unnamed module is NULL");
2792         _package_entry = loader_data->packages()->lookup(pkg_name,
2793                                                          loader_data->unnamed_module());
2794       }
2795 
2796       // A package should have been successfully created
2797       assert(_package_entry != NULL, "Package entry for class %s not found, loader %s",
2798              name()->as_C_string(), loader_data->loader_name_and_id());
2799     }
2800 
2801     if (log_is_enabled(Debug, module)) {
2802       ResourceMark rm;
2803       ModuleEntry* m = _package_entry->module();
2804       log_trace(module)("Setting package: class: %s, package: %s, loader: %s, module: %s",
2805                         external_name(),
2806                         pkg_name->as_C_string(),
2807                         loader_data->loader_name_and_id(),
2808                         (m->is_named() ? m->name()->as_C_string() : UNNAMED_MODULE));
2809     }
2810   } else {
2811     ResourceMark rm;
2812     log_trace(module)("Setting package: class: %s, package: unnamed, loader: %s, module: %s",
2813                       external_name(),
2814                       (loader_data != NULL) ? loader_data->loader_name_and_id() : "NULL",
2815                       UNNAMED_MODULE);
2816   }
2817 }
2818 
2819 
2820 // different versions of is_same_class_package
2821 
2822 bool InstanceKlass::is_same_class_package(const Klass* class2) const {
2823   oop classloader1 = this->class_loader();
2824   PackageEntry* classpkg1 = this->package();
2825   if (class2->is_objArray_klass()) {
2826     class2 = ObjArrayKlass::cast(class2)->bottom_klass();
2827   }
2828 
2829   oop classloader2;
2830   PackageEntry* classpkg2;
2831   if (class2->is_instance_klass()) {
2832     classloader2 = class2->class_loader();
2833     classpkg2 = class2->package();
2834   } else {
2835     assert(class2->is_typeArray_klass(), "should be type array");
2836     classloader2 = NULL;
2837     classpkg2 = NULL;
2838   }
2839 
2840   // Same package is determined by comparing class loader
2841   // and package entries. Both must be the same. This rule
2842   // applies even to classes that are defined in the unnamed
2843   // package, they still must have the same class loader.
2844   if (oopDesc::equals(classloader1, classloader2) && (classpkg1 == classpkg2)) {
2845     return true;
2846   }
2847 
2848   return false;
2849 }
2850 
2851 // return true if this class and other_class are in the same package. Classloader
2852 // and classname information is enough to determine a class's package
2853 bool InstanceKlass::is_same_class_package(oop other_class_loader,
2854                                           const Symbol* other_class_name) const {
2855   if (!oopDesc::equals(class_loader(), other_class_loader)) {
2856     return false;
2857   }
2858   if (name()->fast_compare(other_class_name) == 0) {
2859      return true;
2860   }
2861 
2862   {
2863     ResourceMark rm;
2864 
2865     bool bad_class_name = false;
2866     const char* other_pkg =
2867       ClassLoader::package_from_name((const char*) other_class_name->as_C_string(), &bad_class_name);
2868     if (bad_class_name) {
2869       return false;
2870     }
2871     // Check that package_from_name() returns NULL, not "", if there is no package.
2872     assert(other_pkg == NULL || strlen(other_pkg) > 0, "package name is empty string");
2873 
2874     const Symbol* const this_package_name =
2875       this->package() != NULL ? this->package()->name() : NULL;
2876 
2877     if (this_package_name == NULL || other_pkg == NULL) {
2878       // One of the two doesn't have a package.  Only return true if the other
2879       // one also doesn't have a package.
2880       return (const char*)this_package_name == other_pkg;
2881     }
2882 
2883     // Check if package is identical
2884     return this_package_name->equals(other_pkg);
2885   }
2886 }
2887 
2888 // Returns true iff super_method can be overridden by a method in targetclassname
2889 // See JLS 3rd edition 8.4.6.1
2890 // Assumes name-signature match
2891 // "this" is InstanceKlass of super_method which must exist
2892 // note that the InstanceKlass of the method in the targetclassname has not always been created yet
2893 bool InstanceKlass::is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS) {
2894    // Private methods can not be overridden
2895    if (super_method->is_private()) {
2896      return false;
2897    }
2898    // If super method is accessible, then override
2899    if ((super_method->is_protected()) ||
2900        (super_method->is_public())) {
2901      return true;
2902    }
2903    // Package-private methods are not inherited outside of package
2904    assert(super_method->is_package_private(), "must be package private");
2905    return(is_same_class_package(targetclassloader(), targetclassname));
2906 }
2907 
2908 // Only boot and platform class loaders can define classes in "java/" packages.
2909 void InstanceKlass::check_prohibited_package(Symbol* class_name,
2910                                              ClassLoaderData* loader_data,
2911                                              TRAPS) {
2912   if (!loader_data->is_boot_class_loader_data() &&
2913       !loader_data->is_platform_class_loader_data() &&
2914       class_name != NULL) {
2915     ResourceMark rm(THREAD);
2916     char* name = class_name->as_C_string();
2917     if (strncmp(name, JAVAPKG, JAVAPKG_LEN) == 0 && name[JAVAPKG_LEN] == '/') {
2918       TempNewSymbol pkg_name = InstanceKlass::package_from_name(class_name, CHECK);
2919       assert(pkg_name != NULL, "Error in parsing package name starting with 'java/'");
2920       name = pkg_name->as_C_string();
2921       const char* class_loader_name = loader_data->loader_name_and_id();
2922       StringUtils::replace_no_expand(name, "/", ".");
2923       const char* msg_text1 = "Class loader (instance of): ";
2924       const char* msg_text2 = " tried to load prohibited package name: ";
2925       size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + strlen(name) + 1;
2926       char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len);
2927       jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, name);
2928       THROW_MSG(vmSymbols::java_lang_SecurityException(), message);
2929     }
2930   }
2931   return;
2932 }
2933 
2934 bool InstanceKlass::find_inner_classes_attr(int* ooff, int* noff, TRAPS) const {
2935   constantPoolHandle i_cp(THREAD, constants());
2936   for (InnerClassesIterator iter(this); !iter.done(); iter.next()) {
2937     int ioff = iter.inner_class_info_index();
2938     if (ioff != 0) {
2939       // Check to see if the name matches the class we're looking for
2940       // before attempting to find the class.
2941       if (i_cp->klass_name_at_matches(this, ioff)) {
2942         Klass* inner_klass = i_cp->klass_at(ioff, CHECK_false);
2943         if (this == inner_klass) {
2944           *ooff = iter.outer_class_info_index();
2945           *noff = iter.inner_name_index();
2946           return true;
2947         }
2948       }
2949     }
2950   }
2951   return false;
2952 }
2953 
2954 InstanceKlass* InstanceKlass::compute_enclosing_class(bool* inner_is_member, TRAPS) const {
2955   InstanceKlass* outer_klass = NULL;
2956   *inner_is_member = false;
2957   int ooff = 0, noff = 0;
2958   bool has_inner_classes_attr = find_inner_classes_attr(&ooff, &noff, THREAD);
2959   if (has_inner_classes_attr) {
2960     constantPoolHandle i_cp(THREAD, constants());
2961     if (ooff != 0) {
2962       Klass* ok = i_cp->klass_at(ooff, CHECK_NULL);
2963       outer_klass = InstanceKlass::cast(ok);
2964       *inner_is_member = true;
2965     }
2966     if (NULL == outer_klass) {
2967       // It may be unsafe anonymous; try for that.
2968       int encl_method_class_idx = enclosing_method_class_index();
2969       if (encl_method_class_idx != 0) {
2970         Klass* ok = i_cp->klass_at(encl_method_class_idx, CHECK_NULL);
2971         outer_klass = InstanceKlass::cast(ok);
2972         *inner_is_member = false;
2973       }
2974     }
2975   }
2976 
2977   // If no inner class attribute found for this class.
2978   if (NULL == outer_klass) return NULL;
2979 
2980   // Throws an exception if outer klass has not declared k as an inner klass
2981   // We need evidence that each klass knows about the other, or else
2982   // the system could allow a spoof of an inner class to gain access rights.
2983   Reflection::check_for_inner_class(outer_klass, this, *inner_is_member, CHECK_NULL);
2984   return outer_klass;
2985 }
2986 
2987 jint InstanceKlass::compute_modifier_flags(TRAPS) const {
2988   jint access = access_flags().as_int();
2989 
2990   // But check if it happens to be member class.
2991   InnerClassesIterator iter(this);
2992   for (; !iter.done(); iter.next()) {
2993     int ioff = iter.inner_class_info_index();
2994     // Inner class attribute can be zero, skip it.
2995     // Strange but true:  JVM spec. allows null inner class refs.
2996     if (ioff == 0) continue;
2997 
2998     // only look at classes that are already loaded
2999     // since we are looking for the flags for our self.
3000     Symbol* inner_name = constants()->klass_name_at(ioff);
3001     if (name() == inner_name) {
3002       // This is really a member class.
3003       access = iter.inner_access_flags();
3004       break;
3005     }
3006   }
3007   // Remember to strip ACC_SUPER bit
3008   return (access & (~JVM_ACC_SUPER)) & JVM_ACC_WRITTEN_FLAGS;
3009 }
3010 
3011 jint InstanceKlass::jvmti_class_status() const {
3012   jint result = 0;
3013 
3014   if (is_linked()) {
3015     result |= JVMTI_CLASS_STATUS_VERIFIED | JVMTI_CLASS_STATUS_PREPARED;
3016   }
3017 
3018   if (is_initialized()) {
3019     assert(is_linked(), "Class status is not consistent");
3020     result |= JVMTI_CLASS_STATUS_INITIALIZED;
3021   }
3022   if (is_in_error_state()) {
3023     result |= JVMTI_CLASS_STATUS_ERROR;
3024   }
3025   return result;
3026 }
3027 
3028 Method* InstanceKlass::method_at_itable(Klass* holder, int index, TRAPS) {
3029   itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable();
3030   int method_table_offset_in_words = ioe->offset()/wordSize;
3031   int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words())
3032                        / itableOffsetEntry::size();
3033 
3034   for (int cnt = 0 ; ; cnt ++, ioe ++) {
3035     // If the interface isn't implemented by the receiver class,
3036     // the VM should throw IncompatibleClassChangeError.
3037     if (cnt >= nof_interfaces) {
3038       ResourceMark rm(THREAD);
3039       stringStream ss;
3040       bool same_module = (module() == holder->module());
3041       ss.print("Receiver class %s does not implement "
3042                "the interface %s defining the method to be called "
3043                "(%s%s%s)",
3044                external_name(), holder->external_name(),
3045                (same_module) ? joint_in_module_of_loader(holder) : class_in_module_of_loader(),
3046                (same_module) ? "" : "; ",
3047                (same_module) ? "" : holder->class_in_module_of_loader());
3048       THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
3049     }
3050 
3051     Klass* ik = ioe->interface_klass();
3052     if (ik == holder) break;
3053   }
3054 
3055   itableMethodEntry* ime = ioe->first_method_entry(this);
3056   Method* m = ime[index].method();
3057   if (m == NULL) {
3058     THROW_NULL(vmSymbols::java_lang_AbstractMethodError());
3059   }
3060   return m;
3061 }
3062 
3063 
3064 #if INCLUDE_JVMTI
3065 // update default_methods for redefineclasses for methods that are
3066 // not yet in the vtable due to concurrent subclass define and superinterface
3067 // redefinition
3068 // Note: those in the vtable, should have been updated via adjust_method_entries
3069 void InstanceKlass::adjust_default_methods(bool* trace_name_printed) {
3070   // search the default_methods for uses of either obsolete or EMCP methods
3071   if (default_methods() != NULL) {
3072     for (int index = 0; index < default_methods()->length(); index ++) {
3073       Method* old_method = default_methods()->at(index);
3074       if (old_method == NULL || !old_method->is_old()) {
3075         continue; // skip uninteresting entries
3076       }
3077       assert(!old_method->is_deleted(), "default methods may not be deleted");
3078       Method* new_method = old_method->get_new_method();
3079       default_methods()->at_put(index, new_method);
3080 
3081       if (log_is_enabled(Info, redefine, class, update)) {
3082         ResourceMark rm;
3083         if (!(*trace_name_printed)) {
3084           log_info(redefine, class, update)
3085             ("adjust: klassname=%s default methods from name=%s",
3086              external_name(), old_method->method_holder()->external_name());
3087           *trace_name_printed = true;
3088         }
3089         log_debug(redefine, class, update, vtables)
3090           ("default method update: %s(%s) ",
3091            new_method->name()->as_C_string(), new_method->signature()->as_C_string());
3092       }
3093     }
3094   }
3095 }
3096 #endif // INCLUDE_JVMTI
3097 
3098 // On-stack replacement stuff
3099 void InstanceKlass::add_osr_nmethod(nmethod* n) {
3100 #ifndef PRODUCT
3101   if (TieredCompilation) {
3102       nmethod * prev = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), n->comp_level(), true);
3103       assert(prev == NULL || !prev->is_in_use(),
3104       "redundunt OSR recompilation detected. memory leak in CodeCache!");
3105   }
3106 #endif
3107   // only one compilation can be active
3108   {
3109     // This is a short non-blocking critical region, so the no safepoint check is ok.
3110     MutexLocker ml(OsrList_lock, Mutex::_no_safepoint_check_flag);
3111     assert(n->is_osr_method(), "wrong kind of nmethod");
3112     n->set_osr_link(osr_nmethods_head());
3113     set_osr_nmethods_head(n);
3114     // Raise the highest osr level if necessary
3115     if (TieredCompilation) {
3116       Method* m = n->method();
3117       m->set_highest_osr_comp_level(MAX2(m->highest_osr_comp_level(), n->comp_level()));
3118     }
3119   }
3120 
3121   // Get rid of the osr methods for the same bci that have lower levels.
3122   if (TieredCompilation) {
3123     for (int l = CompLevel_limited_profile; l < n->comp_level(); l++) {
3124       nmethod *inv = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), l, true);
3125       if (inv != NULL && inv->is_in_use()) {
3126         inv->make_not_entrant();
3127       }
3128     }
3129   }
3130 }
3131 
3132 // Remove osr nmethod from the list. Return true if found and removed.
3133 bool InstanceKlass::remove_osr_nmethod(nmethod* n) {
3134   // This is a short non-blocking critical region, so the no safepoint check is ok.
3135   MutexLocker ml(OsrList_lock, Mutex::_no_safepoint_check_flag);
3136   assert(n->is_osr_method(), "wrong kind of nmethod");
3137   nmethod* last = NULL;
3138   nmethod* cur  = osr_nmethods_head();
3139   int max_level = CompLevel_none;  // Find the max comp level excluding n
3140   Method* m = n->method();
3141   // Search for match
3142   bool found = false;
3143   while(cur != NULL && cur != n) {
3144     if (TieredCompilation && m == cur->method()) {
3145       // Find max level before n
3146       max_level = MAX2(max_level, cur->comp_level());
3147     }
3148     last = cur;
3149     cur = cur->osr_link();
3150   }
3151   nmethod* next = NULL;
3152   if (cur == n) {
3153     found = true;
3154     next = cur->osr_link();
3155     if (last == NULL) {
3156       // Remove first element
3157       set_osr_nmethods_head(next);
3158     } else {
3159       last->set_osr_link(next);
3160     }
3161   }
3162   n->set_osr_link(NULL);
3163   if (TieredCompilation) {
3164     cur = next;
3165     while (cur != NULL) {
3166       // Find max level after n
3167       if (m == cur->method()) {
3168         max_level = MAX2(max_level, cur->comp_level());
3169       }
3170       cur = cur->osr_link();
3171     }
3172     m->set_highest_osr_comp_level(max_level);
3173   }
3174   return found;
3175 }
3176 
3177 int InstanceKlass::mark_osr_nmethods(const Method* m) {
3178   // This is a short non-blocking critical region, so the no safepoint check is ok.
3179   MutexLocker ml(OsrList_lock, Mutex::_no_safepoint_check_flag);
3180   nmethod* osr = osr_nmethods_head();
3181   int found = 0;
3182   while (osr != NULL) {
3183     assert(osr->is_osr_method(), "wrong kind of nmethod found in chain");
3184     if (osr->method() == m) {
3185       osr->mark_for_deoptimization();
3186       found++;
3187     }
3188     osr = osr->osr_link();
3189   }
3190   return found;
3191 }
3192 
3193 nmethod* InstanceKlass::lookup_osr_nmethod(const Method* m, int bci, int comp_level, bool match_level) const {
3194   // This is a short non-blocking critical region, so the no safepoint check is ok.
3195   MutexLocker ml(OsrList_lock, Mutex::_no_safepoint_check_flag);
3196   nmethod* osr = osr_nmethods_head();
3197   nmethod* best = NULL;
3198   while (osr != NULL) {
3199     assert(osr->is_osr_method(), "wrong kind of nmethod found in chain");
3200     // There can be a time when a c1 osr method exists but we are waiting
3201     // for a c2 version. When c2 completes its osr nmethod we will trash
3202     // the c1 version and only be able to find the c2 version. However
3203     // while we overflow in the c1 code at back branches we don't want to
3204     // try and switch to the same code as we are already running
3205 
3206     if (osr->method() == m &&
3207         (bci == InvocationEntryBci || osr->osr_entry_bci() == bci)) {
3208       if (match_level) {
3209         if (osr->comp_level() == comp_level) {
3210           // Found a match - return it.
3211           return osr;
3212         }
3213       } else {
3214         if (best == NULL || (osr->comp_level() > best->comp_level())) {
3215           if (osr->comp_level() == CompLevel_highest_tier) {
3216             // Found the best possible - return it.
3217             return osr;
3218           }
3219           best = osr;
3220         }
3221       }
3222     }
3223     osr = osr->osr_link();
3224   }
3225 
3226   assert(match_level == false || best == NULL, "shouldn't pick up anything if match_level is set");
3227   if (best != NULL && best->comp_level() >= comp_level) {
3228     return best;
3229   }
3230   return NULL;
3231 }
3232 
3233 // -----------------------------------------------------------------------------------------------------
3234 // Printing
3235 
3236 #ifndef PRODUCT
3237 
3238 #define BULLET  " - "
3239 
3240 static const char* state_names[] = {
3241   "allocated", "loaded", "linked", "being_initialized", "fully_initialized", "initialization_error"
3242 };
3243 
3244 static void print_vtable(address self, intptr_t* start, int len, outputStream* st) {
3245   ResourceMark rm;
3246   int* forward_refs = NEW_RESOURCE_ARRAY(int, len);
3247   for (int i = 0; i < len; i++)  forward_refs[i] = 0;
3248   for (int i = 0; i < len; i++) {
3249     intptr_t e = start[i];
3250     st->print("%d : " INTPTR_FORMAT, i, e);
3251     if (forward_refs[i] != 0) {
3252       int from = forward_refs[i];
3253       int off = (int) start[from];
3254       st->print(" (offset %d <= [%d])", off, from);
3255     }
3256     if (MetaspaceObj::is_valid((Metadata*)e)) {
3257       st->print(" ");
3258       ((Metadata*)e)->print_value_on(st);
3259     } else if (self != NULL && e > 0 && e < 0x10000) {
3260       address location = self + e;
3261       int index = (int)((intptr_t*)location - start);
3262       st->print(" (offset %d => [%d])", (int)e, index);
3263       if (index >= 0 && index < len)
3264         forward_refs[index] = i;
3265     }
3266     st->cr();
3267   }
3268 }
3269 
3270 static void print_vtable(vtableEntry* start, int len, outputStream* st) {
3271   return print_vtable(NULL, reinterpret_cast<intptr_t*>(start), len, st);
3272 }
3273 
3274 template<typename T>
3275  static void print_array_on(outputStream* st, Array<T>* array) {
3276    if (array == NULL) { st->print_cr("NULL"); return; }
3277    array->print_value_on(st); st->cr();
3278    if (Verbose || WizardMode) {
3279      for (int i = 0; i < array->length(); i++) {
3280        st->print("%d : ", i); array->at(i)->print_value_on(st); st->cr();
3281      }
3282    }
3283  }
3284 
3285 static void print_array_on(outputStream* st, Array<int>* array) {
3286   if (array == NULL) { st->print_cr("NULL"); return; }
3287   array->print_value_on(st); st->cr();
3288   if (Verbose || WizardMode) {
3289     for (int i = 0; i < array->length(); i++) {
3290       st->print("%d : %d", i, array->at(i)); st->cr();
3291     }
3292   }
3293 }
3294 
3295 void InstanceKlass::print_on(outputStream* st) const {
3296   assert(is_klass(), "must be klass");
3297   Klass::print_on(st);
3298 
3299   st->print(BULLET"instance size:     %d", size_helper());                        st->cr();
3300   st->print(BULLET"klass size:        %d", size());                               st->cr();
3301   st->print(BULLET"access:            "); access_flags().print_on(st);            st->cr();
3302   st->print(BULLET"misc flags:        0x%x", _misc_flags);                        st->cr();
3303   st->print(BULLET"state:             "); st->print_cr("%s", state_names[_init_state]);
3304   st->print(BULLET"name:              "); name()->print_value_on(st);             st->cr();
3305   st->print(BULLET"super:             "); Metadata::print_value_on_maybe_null(st, super()); st->cr();
3306   st->print(BULLET"sub:               ");
3307   Klass* sub = subklass();
3308   int n;
3309   for (n = 0; sub != NULL; n++, sub = sub->next_sibling()) {
3310     if (n < MaxSubklassPrintSize) {
3311       sub->print_value_on(st);
3312       st->print("   ");
3313     }
3314   }
3315   if (n >= MaxSubklassPrintSize) st->print("(" INTX_FORMAT " more klasses...)", n - MaxSubklassPrintSize);
3316   st->cr();
3317 
3318   if (is_interface()) {
3319     st->print_cr(BULLET"nof implementors:  %d", nof_implementors());
3320     if (nof_implementors() == 1) {
3321       st->print_cr(BULLET"implementor:    ");
3322       st->print("   ");
3323       implementor()->print_value_on(st);
3324       st->cr();
3325     }
3326   }
3327 
3328   st->print(BULLET"arrays:            "); Metadata::print_value_on_maybe_null(st, array_klasses()); st->cr();
3329   st->print(BULLET"methods:           "); print_array_on(st, methods());
3330   st->print(BULLET"method ordering:   "); print_array_on(st, method_ordering());
3331   st->print(BULLET"default_methods:   "); print_array_on(st, default_methods());
3332   if (default_vtable_indices() != NULL) {
3333     st->print(BULLET"default vtable indices:   "); print_array_on(st, default_vtable_indices());
3334   }
3335   st->print(BULLET"local interfaces:  "); print_array_on(st, local_interfaces());
3336   st->print(BULLET"trans. interfaces: "); print_array_on(st, transitive_interfaces());
3337   st->print(BULLET"constants:         "); constants()->print_value_on(st);         st->cr();
3338   if (class_loader_data() != NULL) {
3339     st->print(BULLET"class loader data:  ");
3340     class_loader_data()->print_value_on(st);
3341     st->cr();
3342   }
3343   st->print(BULLET"unsafe anonymous host class:        "); Metadata::print_value_on_maybe_null(st, unsafe_anonymous_host()); st->cr();
3344   if (source_file_name() != NULL) {
3345     st->print(BULLET"source file:       ");
3346     source_file_name()->print_value_on(st);
3347     st->cr();
3348   }
3349   if (source_debug_extension() != NULL) {
3350     st->print(BULLET"source debug extension:       ");
3351     st->print("%s", source_debug_extension());
3352     st->cr();
3353   }
3354   st->print(BULLET"class annotations:       "); class_annotations()->print_value_on(st); st->cr();
3355   st->print(BULLET"class type annotations:  "); class_type_annotations()->print_value_on(st); st->cr();
3356   st->print(BULLET"field annotations:       "); fields_annotations()->print_value_on(st); st->cr();
3357   st->print(BULLET"field type annotations:  "); fields_type_annotations()->print_value_on(st); st->cr();
3358   {
3359     bool have_pv = false;
3360     // previous versions are linked together through the InstanceKlass
3361     for (InstanceKlass* pv_node = previous_versions();
3362          pv_node != NULL;
3363          pv_node = pv_node->previous_versions()) {
3364       if (!have_pv)
3365         st->print(BULLET"previous version:  ");
3366       have_pv = true;
3367       pv_node->constants()->print_value_on(st);
3368     }
3369     if (have_pv) st->cr();
3370   }
3371 
3372   if (generic_signature() != NULL) {
3373     st->print(BULLET"generic signature: ");
3374     generic_signature()->print_value_on(st);
3375     st->cr();
3376   }
3377   st->print(BULLET"inner classes:     "); inner_classes()->print_value_on(st);     st->cr();
3378   st->print(BULLET"nest members:     "); nest_members()->print_value_on(st);     st->cr();
3379   if (java_mirror() != NULL) {
3380     st->print(BULLET"java mirror:       ");
3381     java_mirror()->print_value_on(st);
3382     st->cr();
3383   } else {
3384     st->print_cr(BULLET"java mirror:       NULL");
3385   }
3386   st->print(BULLET"vtable length      %d  (start addr: " INTPTR_FORMAT ")", vtable_length(), p2i(start_of_vtable())); st->cr();
3387   if (vtable_length() > 0 && (Verbose || WizardMode))  print_vtable(start_of_vtable(), vtable_length(), st);
3388   st->print(BULLET"itable length      %d (start addr: " INTPTR_FORMAT ")", itable_length(), p2i(start_of_itable())); st->cr();
3389   if (itable_length() > 0 && (Verbose || WizardMode))  print_vtable(NULL, start_of_itable(), itable_length(), st);
3390   st->print_cr(BULLET"---- static fields (%d words):", static_field_size());
3391   FieldPrinter print_static_field(st);
3392   ((InstanceKlass*)this)->do_local_static_fields(&print_static_field);
3393   st->print_cr(BULLET"---- non-static fields (%d words):", nonstatic_field_size());
3394   FieldPrinter print_nonstatic_field(st);
3395   InstanceKlass* ik = const_cast<InstanceKlass*>(this);
3396   ik->do_nonstatic_fields(&print_nonstatic_field);
3397 
3398   st->print(BULLET"non-static oop maps: ");
3399   OopMapBlock* map     = start_of_nonstatic_oop_maps();
3400   OopMapBlock* end_map = map + nonstatic_oop_map_count();
3401   while (map < end_map) {
3402     st->print("%d-%d ", map->offset(), map->offset() + heapOopSize*(map->count() - 1));
3403     map++;
3404   }
3405   st->cr();
3406 }
3407 
3408 #endif //PRODUCT
3409 
3410 void InstanceKlass::print_value_on(outputStream* st) const {
3411   assert(is_klass(), "must be klass");
3412   if (Verbose || WizardMode)  access_flags().print_on(st);
3413   name()->print_value_on(st);
3414 }
3415 
3416 #ifndef PRODUCT
3417 
3418 void FieldPrinter::do_field(fieldDescriptor* fd) {
3419   _st->print(BULLET);
3420    if (_obj == NULL) {
3421      fd->print_on(_st);
3422      _st->cr();
3423    } else {
3424      fd->print_on_for(_st, _obj);
3425      _st->cr();
3426    }
3427 }
3428 
3429 
3430 void InstanceKlass::oop_print_on(oop obj, outputStream* st) {
3431   Klass::oop_print_on(obj, st);
3432 
3433   if (this == SystemDictionary::String_klass()) {
3434     typeArrayOop value  = java_lang_String::value(obj);
3435     juint        length = java_lang_String::length(obj);
3436     if (value != NULL &&
3437         value->is_typeArray() &&
3438         length <= (juint) value->length()) {
3439       st->print(BULLET"string: ");
3440       java_lang_String::print(obj, st);
3441       st->cr();
3442       if (!WizardMode)  return;  // that is enough
3443     }
3444   }
3445 
3446   st->print_cr(BULLET"---- fields (total size %d words):", oop_size(obj));
3447   FieldPrinter print_field(st, obj);
3448   do_nonstatic_fields(&print_field);
3449 
3450   if (this == SystemDictionary::Class_klass()) {
3451     st->print(BULLET"signature: ");
3452     java_lang_Class::print_signature(obj, st);
3453     st->cr();
3454     Klass* mirrored_klass = java_lang_Class::as_Klass(obj);
3455     st->print(BULLET"fake entry for mirror: ");
3456     Metadata::print_value_on_maybe_null(st, mirrored_klass);
3457     st->cr();
3458     Klass* array_klass = java_lang_Class::array_klass_acquire(obj);
3459     st->print(BULLET"fake entry for array: ");
3460     Metadata::print_value_on_maybe_null(st, array_klass);
3461     st->cr();
3462     st->print_cr(BULLET"fake entry for oop_size: %d", java_lang_Class::oop_size(obj));
3463     st->print_cr(BULLET"fake entry for static_oop_field_count: %d", java_lang_Class::static_oop_field_count(obj));
3464     Klass* real_klass = java_lang_Class::as_Klass(obj);
3465     if (real_klass != NULL && real_klass->is_instance_klass()) {
3466       InstanceKlass::cast(real_klass)->do_local_static_fields(&print_field);
3467     }
3468   } else if (this == SystemDictionary::MethodType_klass()) {
3469     st->print(BULLET"signature: ");
3470     java_lang_invoke_MethodType::print_signature(obj, st);
3471     st->cr();
3472   }
3473 }
3474 
3475 bool InstanceKlass::verify_itable_index(int i) {
3476   int method_count = klassItable::method_count_for_interface(this);
3477   assert(i >= 0 && i < method_count, "index out of bounds");
3478   return true;
3479 }
3480 
3481 #endif //PRODUCT
3482 
3483 void InstanceKlass::oop_print_value_on(oop obj, outputStream* st) {
3484   st->print("a ");
3485   name()->print_value_on(st);
3486   obj->print_address_on(st);
3487   if (this == SystemDictionary::String_klass()
3488       && java_lang_String::value(obj) != NULL) {
3489     ResourceMark rm;
3490     int len = java_lang_String::length(obj);
3491     int plen = (len < 24 ? len : 12);
3492     char* str = java_lang_String::as_utf8_string(obj, 0, plen);
3493     st->print(" = \"%s\"", str);
3494     if (len > plen)
3495       st->print("...[%d]", len);
3496   } else if (this == SystemDictionary::Class_klass()) {
3497     Klass* k = java_lang_Class::as_Klass(obj);
3498     st->print(" = ");
3499     if (k != NULL) {
3500       k->print_value_on(st);
3501     } else {
3502       const char* tname = type2name(java_lang_Class::primitive_type(obj));
3503       st->print("%s", tname ? tname : "type?");
3504     }
3505   } else if (this == SystemDictionary::MethodType_klass()) {
3506     st->print(" = ");
3507     java_lang_invoke_MethodType::print_signature(obj, st);
3508   } else if (java_lang_boxing_object::is_instance(obj)) {
3509     st->print(" = ");
3510     java_lang_boxing_object::print(obj, st);
3511   } else if (this == SystemDictionary::LambdaForm_klass()) {
3512     oop vmentry = java_lang_invoke_LambdaForm::vmentry(obj);
3513     if (vmentry != NULL) {
3514       st->print(" => ");
3515       vmentry->print_value_on(st);
3516     }
3517   } else if (this == SystemDictionary::MemberName_klass()) {
3518     Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(obj);
3519     if (vmtarget != NULL) {
3520       st->print(" = ");
3521       vmtarget->print_value_on(st);
3522     } else {
3523       java_lang_invoke_MemberName::clazz(obj)->print_value_on(st);
3524       st->print(".");
3525       java_lang_invoke_MemberName::name(obj)->print_value_on(st);
3526     }
3527   }
3528 }
3529 
3530 const char* InstanceKlass::internal_name() const {
3531   return external_name();
3532 }
3533 
3534 void InstanceKlass::print_class_load_logging(ClassLoaderData* loader_data,
3535                                              const char* module_name,
3536                                              const ClassFileStream* cfs) const {
3537   if (!log_is_enabled(Info, class, load)) {
3538     return;
3539   }
3540 
3541   ResourceMark rm;
3542   LogMessage(class, load) msg;
3543   stringStream info_stream;
3544 
3545   // Name and class hierarchy info
3546   info_stream.print("%s", external_name());
3547 
3548   // Source
3549   if (cfs != NULL) {
3550     if (cfs->source() != NULL) {
3551       if (module_name != NULL) {
3552         // When the boot loader created the stream, it didn't know the module name
3553         // yet. Let's format it now.
3554         if (cfs->from_boot_loader_modules_image()) {
3555           info_stream.print(" source: jrt:/%s", module_name);
3556         } else {
3557           info_stream.print(" source: %s", cfs->source());
3558         }
3559       } else {
3560         info_stream.print(" source: %s", cfs->source());
3561       }
3562     } else if (loader_data == ClassLoaderData::the_null_class_loader_data()) {
3563       Thread* THREAD = Thread::current();
3564       Klass* caller =
3565             THREAD->is_Java_thread()
3566                 ? ((JavaThread*)THREAD)->security_get_caller_class(1)
3567                 : NULL;
3568       // caller can be NULL, for example, during a JVMTI VM_Init hook
3569       if (caller != NULL) {
3570         info_stream.print(" source: instance of %s", caller->external_name());
3571       } else {
3572         // source is unknown
3573       }
3574     } else {
3575       oop class_loader = loader_data->class_loader();
3576       info_stream.print(" source: %s", class_loader->klass()->external_name());
3577     }
3578   } else {
3579     assert(this->is_shared(), "must be");
3580     if (MetaspaceShared::is_shared_dynamic((void*)this)) {
3581       info_stream.print(" source: shared objects file (top)");
3582     } else {
3583       info_stream.print(" source: shared objects file");
3584     }
3585   }
3586 
3587   msg.info("%s", info_stream.as_string());
3588 
3589   if (log_is_enabled(Debug, class, load)) {
3590     stringStream debug_stream;
3591 
3592     // Class hierarchy info
3593     debug_stream.print(" klass: " INTPTR_FORMAT " super: " INTPTR_FORMAT,
3594                        p2i(this),  p2i(superklass()));
3595 
3596     // Interfaces
3597     if (local_interfaces() != NULL && local_interfaces()->length() > 0) {
3598       debug_stream.print(" interfaces:");
3599       int length = local_interfaces()->length();
3600       for (int i = 0; i < length; i++) {
3601         debug_stream.print(" " INTPTR_FORMAT,
3602                            p2i(InstanceKlass::cast(local_interfaces()->at(i))));
3603       }
3604     }
3605 
3606     // Class loader
3607     debug_stream.print(" loader: [");
3608     loader_data->print_value_on(&debug_stream);
3609     debug_stream.print("]");
3610 
3611     // Classfile checksum
3612     if (cfs) {
3613       debug_stream.print(" bytes: %d checksum: %08x",
3614                          cfs->length(),
3615                          ClassLoader::crc32(0, (const char*)cfs->buffer(),
3616                          cfs->length()));
3617     }
3618 
3619     msg.debug("%s", debug_stream.as_string());
3620   }
3621 }
3622 
3623 #if INCLUDE_SERVICES
3624 // Size Statistics
3625 void InstanceKlass::collect_statistics(KlassSizeStats *sz) const {
3626   Klass::collect_statistics(sz);
3627 
3628   sz->_inst_size  = wordSize * size_helper();
3629   sz->_vtab_bytes = wordSize * vtable_length();
3630   sz->_itab_bytes = wordSize * itable_length();
3631   sz->_nonstatic_oopmap_bytes = wordSize * nonstatic_oop_map_size();
3632 
3633   int n = 0;
3634   n += (sz->_methods_array_bytes         = sz->count_array(methods()));
3635   n += (sz->_method_ordering_bytes       = sz->count_array(method_ordering()));
3636   n += (sz->_local_interfaces_bytes      = sz->count_array(local_interfaces()));
3637   n += (sz->_transitive_interfaces_bytes = sz->count_array(transitive_interfaces()));
3638   n += (sz->_fields_bytes                = sz->count_array(fields()));
3639   n += (sz->_inner_classes_bytes         = sz->count_array(inner_classes()));
3640   n += (sz->_nest_members_bytes          = sz->count_array(nest_members()));
3641   sz->_ro_bytes += n;
3642 
3643   const ConstantPool* cp = constants();
3644   if (cp) {
3645     cp->collect_statistics(sz);
3646   }
3647 
3648   const Annotations* anno = annotations();
3649   if (anno) {
3650     anno->collect_statistics(sz);
3651   }
3652 
3653   const Array<Method*>* methods_array = methods();
3654   if (methods()) {
3655     for (int i = 0; i < methods_array->length(); i++) {
3656       Method* method = methods_array->at(i);
3657       if (method) {
3658         sz->_method_count ++;
3659         method->collect_statistics(sz);
3660       }
3661     }
3662   }
3663 }
3664 #endif // INCLUDE_SERVICES
3665 
3666 // Verification
3667 
3668 class VerifyFieldClosure: public BasicOopIterateClosure {
3669  protected:
3670   template <class T> void do_oop_work(T* p) {
3671     oop obj = RawAccess<>::oop_load(p);
3672     if (!oopDesc::is_oop_or_null(obj)) {
3673       tty->print_cr("Failed: " PTR_FORMAT " -> " PTR_FORMAT, p2i(p), p2i(obj));
3674       Universe::print_on(tty);
3675       guarantee(false, "boom");
3676     }
3677   }
3678  public:
3679   virtual void do_oop(oop* p)       { VerifyFieldClosure::do_oop_work(p); }
3680   virtual void do_oop(narrowOop* p) { VerifyFieldClosure::do_oop_work(p); }
3681 };
3682 
3683 void InstanceKlass::verify_on(outputStream* st) {
3684 #ifndef PRODUCT
3685   // Avoid redundant verifies, this really should be in product.
3686   if (_verify_count == Universe::verify_count()) return;
3687   _verify_count = Universe::verify_count();
3688 #endif
3689 
3690   // Verify Klass
3691   Klass::verify_on(st);
3692 
3693   // Verify that klass is present in ClassLoaderData
3694   guarantee(class_loader_data()->contains_klass(this),
3695             "this class isn't found in class loader data");
3696 
3697   // Verify vtables
3698   if (is_linked()) {
3699     // $$$ This used to be done only for m/s collections.  Doing it
3700     // always seemed a valid generalization.  (DLD -- 6/00)
3701     vtable().verify(st);
3702   }
3703 
3704   // Verify first subklass
3705   if (subklass() != NULL) {
3706     guarantee(subklass()->is_klass(), "should be klass");
3707   }
3708 
3709   // Verify siblings
3710   Klass* super = this->super();
3711   Klass* sib = next_sibling();
3712   if (sib != NULL) {
3713     if (sib == this) {
3714       fatal("subclass points to itself " PTR_FORMAT, p2i(sib));
3715     }
3716 
3717     guarantee(sib->is_klass(), "should be klass");
3718     guarantee(sib->super() == super, "siblings should have same superklass");
3719   }
3720 
3721   // Verify local interfaces
3722   if (local_interfaces()) {
3723     Array<InstanceKlass*>* local_interfaces = this->local_interfaces();
3724     for (int j = 0; j < local_interfaces->length(); j++) {
3725       InstanceKlass* e = local_interfaces->at(j);
3726       guarantee(e->is_klass() && e->is_interface(), "invalid local interface");
3727     }
3728   }
3729 
3730   // Verify transitive interfaces
3731   if (transitive_interfaces() != NULL) {
3732     Array<InstanceKlass*>* transitive_interfaces = this->transitive_interfaces();
3733     for (int j = 0; j < transitive_interfaces->length(); j++) {
3734       InstanceKlass* e = transitive_interfaces->at(j);
3735       guarantee(e->is_klass() && e->is_interface(), "invalid transitive interface");
3736     }
3737   }
3738 
3739   // Verify methods
3740   if (methods() != NULL) {
3741     Array<Method*>* methods = this->methods();
3742     for (int j = 0; j < methods->length(); j++) {
3743       guarantee(methods->at(j)->is_method(), "non-method in methods array");
3744     }
3745     for (int j = 0; j < methods->length() - 1; j++) {
3746       Method* m1 = methods->at(j);
3747       Method* m2 = methods->at(j + 1);
3748       guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
3749     }
3750   }
3751 
3752   // Verify method ordering
3753   if (method_ordering() != NULL) {
3754     Array<int>* method_ordering = this->method_ordering();
3755     int length = method_ordering->length();
3756     if (JvmtiExport::can_maintain_original_method_order() ||
3757         ((UseSharedSpaces || DumpSharedSpaces) && length != 0)) {
3758       guarantee(length == methods()->length(), "invalid method ordering length");
3759       jlong sum = 0;
3760       for (int j = 0; j < length; j++) {
3761         int original_index = method_ordering->at(j);
3762         guarantee(original_index >= 0, "invalid method ordering index");
3763         guarantee(original_index < length, "invalid method ordering index");
3764         sum += original_index;
3765       }
3766       // Verify sum of indices 0,1,...,length-1
3767       guarantee(sum == ((jlong)length*(length-1))/2, "invalid method ordering sum");
3768     } else {
3769       guarantee(length == 0, "invalid method ordering length");
3770     }
3771   }
3772 
3773   // Verify default methods
3774   if (default_methods() != NULL) {
3775     Array<Method*>* methods = this->default_methods();
3776     for (int j = 0; j < methods->length(); j++) {
3777       guarantee(methods->at(j)->is_method(), "non-method in methods array");
3778     }
3779     for (int j = 0; j < methods->length() - 1; j++) {
3780       Method* m1 = methods->at(j);
3781       Method* m2 = methods->at(j + 1);
3782       guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
3783     }
3784   }
3785 
3786   // Verify JNI static field identifiers
3787   if (jni_ids() != NULL) {
3788     jni_ids()->verify(this);
3789   }
3790 
3791   // Verify other fields
3792   if (array_klasses() != NULL) {
3793     guarantee(array_klasses()->is_klass(), "should be klass");
3794   }
3795   if (constants() != NULL) {
3796     guarantee(constants()->is_constantPool(), "should be constant pool");
3797   }
3798   const Klass* anonymous_host = unsafe_anonymous_host();
3799   if (anonymous_host != NULL) {
3800     guarantee(anonymous_host->is_klass(), "should be klass");
3801   }
3802 }
3803 
3804 void InstanceKlass::oop_verify_on(oop obj, outputStream* st) {
3805   Klass::oop_verify_on(obj, st);
3806   VerifyFieldClosure blk;
3807   obj->oop_iterate(&blk);
3808 }
3809 
3810 
3811 // JNIid class for jfieldIDs only
3812 // Note to reviewers:
3813 // These JNI functions are just moved over to column 1 and not changed
3814 // in the compressed oops workspace.
3815 JNIid::JNIid(Klass* holder, int offset, JNIid* next) {
3816   _holder = holder;
3817   _offset = offset;
3818   _next = next;
3819   debug_only(_is_static_field_id = false;)
3820 }
3821 
3822 
3823 JNIid* JNIid::find(int offset) {
3824   JNIid* current = this;
3825   while (current != NULL) {
3826     if (current->offset() == offset) return current;
3827     current = current->next();
3828   }
3829   return NULL;
3830 }
3831 
3832 void JNIid::deallocate(JNIid* current) {
3833   while (current != NULL) {
3834     JNIid* next = current->next();
3835     delete current;
3836     current = next;
3837   }
3838 }
3839 
3840 
3841 void JNIid::verify(Klass* holder) {
3842   int first_field_offset  = InstanceMirrorKlass::offset_of_static_fields();
3843   int end_field_offset;
3844   end_field_offset = first_field_offset + (InstanceKlass::cast(holder)->static_field_size() * wordSize);
3845 
3846   JNIid* current = this;
3847   while (current != NULL) {
3848     guarantee(current->holder() == holder, "Invalid klass in JNIid");
3849 #ifdef ASSERT
3850     int o = current->offset();
3851     if (current->is_static_field_id()) {
3852       guarantee(o >= first_field_offset  && o < end_field_offset,  "Invalid static field offset in JNIid");
3853     }
3854 #endif
3855     current = current->next();
3856   }
3857 }
3858 
3859 void InstanceKlass::set_init_state(ClassState state) {
3860 #ifdef ASSERT
3861   bool good_state = is_shared() ? (_init_state <= state)
3862                                                : (_init_state < state);
3863   assert(good_state || state == allocated, "illegal state transition");
3864 #endif
3865   assert(_init_thread == NULL, "should be cleared before state change");
3866   _init_state = (u1)state;
3867 }
3868 
3869 #if INCLUDE_JVMTI
3870 
3871 // RedefineClasses() support for previous versions
3872 
3873 // Globally, there is at least one previous version of a class to walk
3874 // during class unloading, which is saved because old methods in the class
3875 // are still running.   Otherwise the previous version list is cleaned up.
3876 bool InstanceKlass::_has_previous_versions = false;
3877 
3878 // Returns true if there are previous versions of a class for class
3879 // unloading only. Also resets the flag to false. purge_previous_version
3880 // will set the flag to true if there are any left, i.e., if there's any
3881 // work to do for next time. This is to avoid the expensive code cache
3882 // walk in CLDG::clean_deallocate_lists().
3883 bool InstanceKlass::has_previous_versions_and_reset() {
3884   bool ret = _has_previous_versions;
3885   log_trace(redefine, class, iklass, purge)("Class unloading: has_previous_versions = %s",
3886      ret ? "true" : "false");
3887   _has_previous_versions = false;
3888   return ret;
3889 }
3890 
3891 // Purge previous versions before adding new previous versions of the class and
3892 // during class unloading.
3893 void InstanceKlass::purge_previous_version_list() {
3894   assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
3895   assert(has_been_redefined(), "Should only be called for main class");
3896 
3897   // Quick exit.
3898   if (previous_versions() == NULL) {
3899     return;
3900   }
3901 
3902   // This klass has previous versions so see what we can cleanup
3903   // while it is safe to do so.
3904 
3905   int deleted_count = 0;    // leave debugging breadcrumbs
3906   int live_count = 0;
3907   ClassLoaderData* loader_data = class_loader_data();
3908   assert(loader_data != NULL, "should never be null");
3909 
3910   ResourceMark rm;
3911   log_trace(redefine, class, iklass, purge)("%s: previous versions", external_name());
3912 
3913   // previous versions are linked together through the InstanceKlass
3914   InstanceKlass* pv_node = previous_versions();
3915   InstanceKlass* last = this;
3916   int version = 0;
3917 
3918   // check the previous versions list
3919   for (; pv_node != NULL; ) {
3920 
3921     ConstantPool* pvcp = pv_node->constants();
3922     assert(pvcp != NULL, "cp ref was unexpectedly cleared");
3923 
3924     if (!pvcp->on_stack()) {
3925       // If the constant pool isn't on stack, none of the methods
3926       // are executing.  Unlink this previous_version.
3927       // The previous version InstanceKlass is on the ClassLoaderData deallocate list
3928       // so will be deallocated during the next phase of class unloading.
3929       log_trace(redefine, class, iklass, purge)
3930         ("previous version " INTPTR_FORMAT " is dead.", p2i(pv_node));
3931       // For debugging purposes.
3932       pv_node->set_is_scratch_class();
3933       // Unlink from previous version list.
3934       assert(pv_node->class_loader_data() == loader_data, "wrong loader_data");
3935       InstanceKlass* next = pv_node->previous_versions();
3936       pv_node->link_previous_versions(NULL);   // point next to NULL
3937       last->link_previous_versions(next);
3938       // Add to the deallocate list after unlinking
3939       loader_data->add_to_deallocate_list(pv_node);
3940       pv_node = next;
3941       deleted_count++;
3942       version++;
3943       continue;
3944     } else {
3945       log_trace(redefine, class, iklass, purge)("previous version " INTPTR_FORMAT " is alive", p2i(pv_node));
3946       assert(pvcp->pool_holder() != NULL, "Constant pool with no holder");
3947       guarantee (!loader_data->is_unloading(), "unloaded classes can't be on the stack");
3948       live_count++;
3949       // found a previous version for next time we do class unloading
3950       _has_previous_versions = true;
3951     }
3952 
3953     // At least one method is live in this previous version.
3954     // Reset dead EMCP methods not to get breakpoints.
3955     // All methods are deallocated when all of the methods for this class are no
3956     // longer running.
3957     Array<Method*>* method_refs = pv_node->methods();
3958     if (method_refs != NULL) {
3959       log_trace(redefine, class, iklass, purge)("previous methods length=%d", method_refs->length());
3960       for (int j = 0; j < method_refs->length(); j++) {
3961         Method* method = method_refs->at(j);
3962 
3963         if (!method->on_stack()) {
3964           // no breakpoints for non-running methods
3965           if (method->is_running_emcp()) {
3966             method->set_running_emcp(false);
3967           }
3968         } else {
3969           assert (method->is_obsolete() || method->is_running_emcp(),
3970                   "emcp method cannot run after emcp bit is cleared");
3971           log_trace(redefine, class, iklass, purge)
3972             ("purge: %s(%s): prev method @%d in version @%d is alive",
3973              method->name()->as_C_string(), method->signature()->as_C_string(), j, version);
3974         }
3975       }
3976     }
3977     // next previous version
3978     last = pv_node;
3979     pv_node = pv_node->previous_versions();
3980     version++;
3981   }
3982   log_trace(redefine, class, iklass, purge)
3983     ("previous version stats: live=%d, deleted=%d", live_count, deleted_count);
3984 }
3985 
3986 void InstanceKlass::mark_newly_obsolete_methods(Array<Method*>* old_methods,
3987                                                 int emcp_method_count) {
3988   int obsolete_method_count = old_methods->length() - emcp_method_count;
3989 
3990   if (emcp_method_count != 0 && obsolete_method_count != 0 &&
3991       _previous_versions != NULL) {
3992     // We have a mix of obsolete and EMCP methods so we have to
3993     // clear out any matching EMCP method entries the hard way.
3994     int local_count = 0;
3995     for (int i = 0; i < old_methods->length(); i++) {
3996       Method* old_method = old_methods->at(i);
3997       if (old_method->is_obsolete()) {
3998         // only obsolete methods are interesting
3999         Symbol* m_name = old_method->name();
4000         Symbol* m_signature = old_method->signature();
4001 
4002         // previous versions are linked together through the InstanceKlass
4003         int j = 0;
4004         for (InstanceKlass* prev_version = _previous_versions;
4005              prev_version != NULL;
4006              prev_version = prev_version->previous_versions(), j++) {
4007 
4008           Array<Method*>* method_refs = prev_version->methods();
4009           for (int k = 0; k < method_refs->length(); k++) {
4010             Method* method = method_refs->at(k);
4011 
4012             if (!method->is_obsolete() &&
4013                 method->name() == m_name &&
4014                 method->signature() == m_signature) {
4015               // The current RedefineClasses() call has made all EMCP
4016               // versions of this method obsolete so mark it as obsolete
4017               log_trace(redefine, class, iklass, add)
4018                 ("%s(%s): flush obsolete method @%d in version @%d",
4019                  m_name->as_C_string(), m_signature->as_C_string(), k, j);
4020 
4021               method->set_is_obsolete();
4022               break;
4023             }
4024           }
4025 
4026           // The previous loop may not find a matching EMCP method, but
4027           // that doesn't mean that we can optimize and not go any
4028           // further back in the PreviousVersion generations. The EMCP
4029           // method for this generation could have already been made obsolete,
4030           // but there still may be an older EMCP method that has not
4031           // been made obsolete.
4032         }
4033 
4034         if (++local_count >= obsolete_method_count) {
4035           // no more obsolete methods so bail out now
4036           break;
4037         }
4038       }
4039     }
4040   }
4041 }
4042 
4043 // Save the scratch_class as the previous version if any of the methods are running.
4044 // The previous_versions are used to set breakpoints in EMCP methods and they are
4045 // also used to clean MethodData links to redefined methods that are no longer running.
4046 void InstanceKlass::add_previous_version(InstanceKlass* scratch_class,
4047                                          int emcp_method_count) {
4048   assert(Thread::current()->is_VM_thread(),
4049          "only VMThread can add previous versions");
4050 
4051   ResourceMark rm;
4052   log_trace(redefine, class, iklass, add)
4053     ("adding previous version ref for %s, EMCP_cnt=%d", scratch_class->external_name(), emcp_method_count);
4054 
4055   // Clean out old previous versions for this class
4056   purge_previous_version_list();
4057 
4058   // Mark newly obsolete methods in remaining previous versions.  An EMCP method from
4059   // a previous redefinition may be made obsolete by this redefinition.
4060   Array<Method*>* old_methods = scratch_class->methods();
4061   mark_newly_obsolete_methods(old_methods, emcp_method_count);
4062 
4063   // If the constant pool for this previous version of the class
4064   // is not marked as being on the stack, then none of the methods
4065   // in this previous version of the class are on the stack so
4066   // we don't need to add this as a previous version.
4067   ConstantPool* cp_ref = scratch_class->constants();
4068   if (!cp_ref->on_stack()) {
4069     log_trace(redefine, class, iklass, add)("scratch class not added; no methods are running");
4070     // For debugging purposes.
4071     scratch_class->set_is_scratch_class();
4072     scratch_class->class_loader_data()->add_to_deallocate_list(scratch_class);
4073     return;
4074   }
4075 
4076   if (emcp_method_count != 0) {
4077     // At least one method is still running, check for EMCP methods
4078     for (int i = 0; i < old_methods->length(); i++) {
4079       Method* old_method = old_methods->at(i);
4080       if (!old_method->is_obsolete() && old_method->on_stack()) {
4081         // if EMCP method (not obsolete) is on the stack, mark as EMCP so that
4082         // we can add breakpoints for it.
4083 
4084         // We set the method->on_stack bit during safepoints for class redefinition
4085         // and use this bit to set the is_running_emcp bit.
4086         // After the safepoint, the on_stack bit is cleared and the running emcp
4087         // method may exit.   If so, we would set a breakpoint in a method that
4088         // is never reached, but this won't be noticeable to the programmer.
4089         old_method->set_running_emcp(true);
4090         log_trace(redefine, class, iklass, add)
4091           ("EMCP method %s is on_stack " INTPTR_FORMAT, old_method->name_and_sig_as_C_string(), p2i(old_method));
4092       } else if (!old_method->is_obsolete()) {
4093         log_trace(redefine, class, iklass, add)
4094           ("EMCP method %s is NOT on_stack " INTPTR_FORMAT, old_method->name_and_sig_as_C_string(), p2i(old_method));
4095       }
4096     }
4097   }
4098 
4099   // Add previous version if any methods are still running.
4100   // Set has_previous_version flag for processing during class unloading.
4101   _has_previous_versions = true;
4102   log_trace(redefine, class, iklass, add) ("scratch class added; one of its methods is on_stack.");
4103   assert(scratch_class->previous_versions() == NULL, "shouldn't have a previous version");
4104   scratch_class->link_previous_versions(previous_versions());
4105   link_previous_versions(scratch_class);
4106 } // end add_previous_version()
4107 
4108 #endif // INCLUDE_JVMTI
4109 
4110 Method* InstanceKlass::method_with_idnum(int idnum) {
4111   Method* m = NULL;
4112   if (idnum < methods()->length()) {
4113     m = methods()->at(idnum);
4114   }
4115   if (m == NULL || m->method_idnum() != idnum) {
4116     for (int index = 0; index < methods()->length(); ++index) {
4117       m = methods()->at(index);
4118       if (m->method_idnum() == idnum) {
4119         return m;
4120       }
4121     }
4122     // None found, return null for the caller to handle.
4123     return NULL;
4124   }
4125   return m;
4126 }
4127 
4128 
4129 Method* InstanceKlass::method_with_orig_idnum(int idnum) {
4130   if (idnum >= methods()->length()) {
4131     return NULL;
4132   }
4133   Method* m = methods()->at(idnum);
4134   if (m != NULL && m->orig_method_idnum() == idnum) {
4135     return m;
4136   }
4137   // Obsolete method idnum does not match the original idnum
4138   for (int index = 0; index < methods()->length(); ++index) {
4139     m = methods()->at(index);
4140     if (m->orig_method_idnum() == idnum) {
4141       return m;
4142     }
4143   }
4144   // None found, return null for the caller to handle.
4145   return NULL;
4146 }
4147 
4148 
4149 Method* InstanceKlass::method_with_orig_idnum(int idnum, int version) {
4150   InstanceKlass* holder = get_klass_version(version);
4151   if (holder == NULL) {
4152     return NULL; // The version of klass is gone, no method is found
4153   }
4154   Method* method = holder->method_with_orig_idnum(idnum);
4155   return method;
4156 }
4157 
4158 #if INCLUDE_JVMTI
4159 JvmtiCachedClassFileData* InstanceKlass::get_cached_class_file() {
4160   return _cached_class_file;
4161 }
4162 
4163 jint InstanceKlass::get_cached_class_file_len() {
4164   return VM_RedefineClasses::get_cached_class_file_len(_cached_class_file);
4165 }
4166 
4167 unsigned char * InstanceKlass::get_cached_class_file_bytes() {
4168   return VM_RedefineClasses::get_cached_class_file_bytes(_cached_class_file);
4169 }
4170 #endif
4171 
4172 #define THROW_DVT_ERROR(s) \
4173   Exceptions::fthrow(THREAD_AND_LOCATION, vmSymbols::java_lang_IncompatibleClassChangeError(), \
4174       "ValueCapableClass class '%s' %s", external_name(),(s)); \
4175       return
--- EOF ---