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         Klass* klass = this->get_value_field_klass_or_null(fs.index());
1127         if (klass == NULL) {
1128           assert(fs.access_flags().is_static() && fs.access_flags().is_flattenable(),
1129               "Otherwise should have been pre-loaded");
1130           klass = SystemDictionary::resolve_or_fail(field_signature(fs.index())->fundamental_name(THREAD),
1131               Handle(THREAD, class_loader()),
1132               Handle(THREAD, protection_domain()),
1133               true, CHECK);
1134           if (klass == NULL) {
1135             THROW(vmSymbols::java_lang_NoClassDefFoundError());
1136           }
1137           if (!klass->is_value()) {
1138             THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
1139           }
1140           this->set_value_field_klass(fs.index(), klass);
1141         }
1142         InstanceKlass::cast(klass)->initialize(CHECK);
1143         if (fs.access_flags().is_static()) {
1144           java_mirror()->obj_field_put(fs.offset(), ValueKlass::cast(klass)->default_value());
1145         }
1146       }
1147     }
1148   }
1149 
1150 
1151   // Look for aot compiled methods for this klass, including class initializer.
1152   AOTLoader::load_for_klass(this, THREAD);
1153 
1154   // Step 9
1155   {
1156     DTRACE_CLASSINIT_PROBE_WAIT(clinit, -1, wait);
1157     // Timer includes any side effects of class initialization (resolution,
1158     // etc), but not recursive entry into call_class_initializer().
1159     PerfClassTraceTime timer(ClassLoader::perf_class_init_time(),
1160                              ClassLoader::perf_class_init_selftime(),
1161                              ClassLoader::perf_classes_inited(),
1162                              jt->get_thread_stat()->perf_recursion_counts_addr(),
1163                              jt->get_thread_stat()->perf_timers_addr(),
1164                              PerfClassTraceTime::CLASS_CLINIT);
1165     call_class_initializer(THREAD);
1166   }
1167 
1168   // Step 10
1169   if (!HAS_PENDING_EXCEPTION) {
1170     set_initialization_state_and_notify(fully_initialized, CHECK);
1171     {
1172       debug_only(vtable().verify(tty, true);)
1173     }
1174   }
1175   else {
1176     // Step 11 and 12
1177     Handle e(THREAD, PENDING_EXCEPTION);
1178     CLEAR_PENDING_EXCEPTION;
1179     // JVMTI has already reported the pending exception
1180     // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
1181     JvmtiExport::clear_detected_exception(jt);
1182     {
1183       EXCEPTION_MARK;
1184       set_initialization_state_and_notify(initialization_error, THREAD);
1185       CLEAR_PENDING_EXCEPTION;   // ignore any exception thrown, class initialization error is thrown below
1186       // JVMTI has already reported the pending exception
1187       // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
1188       JvmtiExport::clear_detected_exception(jt);
1189     }
1190     DTRACE_CLASSINIT_PROBE_WAIT(error, -1, wait);
1191     if (e->is_a(SystemDictionary::Error_klass())) {
1192       THROW_OOP(e());
1193     } else {
1194       JavaCallArguments args(e);
1195       THROW_ARG(vmSymbols::java_lang_ExceptionInInitializerError(),
1196                 vmSymbols::throwable_void_signature(),
1197                 &args);
1198     }
1199   }
1200   DTRACE_CLASSINIT_PROBE_WAIT(end, -1, wait);
1201 }
1202 
1203 
1204 void InstanceKlass::set_initialization_state_and_notify(ClassState state, TRAPS) {
1205   Handle h_init_lock(THREAD, init_lock());
1206   if (h_init_lock() != NULL) {
1207     ObjectLocker ol(h_init_lock, THREAD);
1208     set_init_thread(NULL); // reset _init_thread before changing _init_state
1209     set_init_state(state);
1210     fence_and_clear_init_lock();
1211     ol.notify_all(CHECK);
1212   } else {
1213     assert(h_init_lock() != NULL, "The initialization state should never be set twice");
1214     set_init_thread(NULL); // reset _init_thread before changing _init_state
1215     set_init_state(state);
1216   }
1217 }
1218 
1219 Klass* InstanceKlass::implementor() const {
1220   Klass* volatile* k = adr_implementor();
1221   if (k == NULL) {
1222     return NULL;
1223   } else {
1224     // This load races with inserts, and therefore needs acquire.
1225     Klass* kls = OrderAccess::load_acquire(k);
1226     if (kls != NULL && !kls->is_loader_alive()) {
1227       return NULL;  // don't return unloaded class
1228     } else {
1229       return kls;
1230     }
1231   }
1232 }
1233 
1234 
1235 void InstanceKlass::set_implementor(Klass* k) {
1236   assert_lock_strong(Compile_lock);
1237   assert(is_interface(), "not interface");
1238   Klass* volatile* addr = adr_implementor();
1239   assert(addr != NULL, "null addr");
1240   if (addr != NULL) {
1241     OrderAccess::release_store(addr, k);
1242   }
1243 }
1244 
1245 int  InstanceKlass::nof_implementors() const {
1246   Klass* k = implementor();
1247   if (k == NULL) {
1248     return 0;
1249   } else if (k != this) {
1250     return 1;
1251   } else {
1252     return 2;
1253   }
1254 }
1255 
1256 // The embedded _implementor field can only record one implementor.
1257 // When there are more than one implementors, the _implementor field
1258 // is set to the interface Klass* itself. Following are the possible
1259 // values for the _implementor field:
1260 //   NULL                  - no implementor
1261 //   implementor Klass*    - one implementor
1262 //   self                  - more than one implementor
1263 //
1264 // The _implementor field only exists for interfaces.
1265 void InstanceKlass::add_implementor(Klass* k) {
1266   assert_lock_strong(Compile_lock);
1267   assert(is_interface(), "not interface");
1268   // Filter out my subinterfaces.
1269   // (Note: Interfaces are never on the subklass list.)
1270   if (InstanceKlass::cast(k)->is_interface()) return;
1271 
1272   // Filter out subclasses whose supers already implement me.
1273   // (Note: CHA must walk subclasses of direct implementors
1274   // in order to locate indirect implementors.)
1275   Klass* sk = k->super();
1276   if (sk != NULL && InstanceKlass::cast(sk)->implements_interface(this))
1277     // We only need to check one immediate superclass, since the
1278     // implements_interface query looks at transitive_interfaces.
1279     // Any supers of the super have the same (or fewer) transitive_interfaces.
1280     return;
1281 
1282   Klass* ik = implementor();
1283   if (ik == NULL) {
1284     set_implementor(k);
1285   } else if (ik != this) {
1286     // There is already an implementor. Use itself as an indicator of
1287     // more than one implementors.
1288     set_implementor(this);
1289   }
1290 
1291   // The implementor also implements the transitive_interfaces
1292   for (int index = 0; index < local_interfaces()->length(); index++) {
1293     InstanceKlass::cast(local_interfaces()->at(index))->add_implementor(k);
1294   }
1295 }
1296 
1297 void InstanceKlass::init_implementor() {
1298   if (is_interface()) {
1299     set_implementor(NULL);
1300   }
1301 }
1302 
1303 
1304 void InstanceKlass::process_interfaces(Thread *thread) {
1305   // link this class into the implementors list of every interface it implements
1306   for (int i = local_interfaces()->length() - 1; i >= 0; i--) {
1307     assert(local_interfaces()->at(i)->is_klass(), "must be a klass");
1308     InstanceKlass* interf = InstanceKlass::cast(local_interfaces()->at(i));
1309     assert(interf->is_interface(), "expected interface");
1310     interf->add_implementor(this);
1311   }
1312 }
1313 
1314 bool InstanceKlass::can_be_primary_super_slow() const {
1315   if (is_interface())
1316     return false;
1317   else
1318     return Klass::can_be_primary_super_slow();
1319 }
1320 
1321 GrowableArray<Klass*>* InstanceKlass::compute_secondary_supers(int num_extra_slots,
1322                                                                Array<InstanceKlass*>* transitive_interfaces) {
1323   // The secondaries are the implemented interfaces.
1324   Array<InstanceKlass*>* interfaces = transitive_interfaces;
1325   int num_secondaries = num_extra_slots + interfaces->length();
1326   if (num_secondaries == 0) {
1327     // Must share this for correct bootstrapping!
1328     set_secondary_supers(Universe::the_empty_klass_array());
1329     return NULL;
1330   } else if (num_extra_slots == 0) {
1331     // The secondary super list is exactly the same as the transitive interfaces, so
1332     // let's use it instead of making a copy.
1333     // Redefine classes has to be careful not to delete this!
1334     // We need the cast because Array<Klass*> is NOT a supertype of Array<InstanceKlass*>,
1335     // (but it's safe to do here because we won't write into _secondary_supers from this point on).
1336     set_secondary_supers((Array<Klass*>*)(address)interfaces);
1337     return NULL;
1338   } else {
1339     // Copy transitive interfaces to a temporary growable array to be constructed
1340     // into the secondary super list with extra slots.
1341     GrowableArray<Klass*>* secondaries = new GrowableArray<Klass*>(interfaces->length());
1342     for (int i = 0; i < interfaces->length(); i++) {
1343       secondaries->push(interfaces->at(i));
1344     }
1345     return secondaries;
1346   }
1347 }
1348 
1349 bool InstanceKlass::implements_interface(Klass* k) const {
1350   if (this == k) return true;
1351   assert(k->is_interface(), "should be an interface class");
1352   for (int i = 0; i < transitive_interfaces()->length(); i++) {
1353     if (transitive_interfaces()->at(i) == k) {
1354       return true;
1355     }
1356   }
1357   return false;
1358 }
1359 
1360 bool InstanceKlass::is_same_or_direct_interface(Klass *k) const {
1361   // Verify direct super interface
1362   if (this == k) return true;
1363   assert(k->is_interface(), "should be an interface class");
1364   for (int i = 0; i < local_interfaces()->length(); i++) {
1365     if (local_interfaces()->at(i) == k) {
1366       return true;
1367     }
1368   }
1369   return false;
1370 }
1371 
1372 objArrayOop InstanceKlass::allocate_objArray(int n, int length, TRAPS) {
1373   check_array_allocation_length(length, arrayOopDesc::max_array_length(T_OBJECT), CHECK_NULL);
1374   int size = objArrayOopDesc::object_size(length);
1375   Klass* ak = array_klass(n, CHECK_NULL);
1376   objArrayOop o = (objArrayOop)Universe::heap()->array_allocate(ak, size, length,
1377                                                                 /* do_zero */ true, CHECK_NULL);
1378   return o;
1379 }
1380 
1381 instanceOop InstanceKlass::register_finalizer(instanceOop i, TRAPS) {
1382   if (TraceFinalizerRegistration) {
1383     tty->print("Registered ");
1384     i->print_value_on(tty);
1385     tty->print_cr(" (" INTPTR_FORMAT ") as finalizable", p2i(i));
1386   }
1387   instanceHandle h_i(THREAD, i);
1388   // Pass the handle as argument, JavaCalls::call expects oop as jobjects
1389   JavaValue result(T_VOID);
1390   JavaCallArguments args(h_i);
1391   methodHandle mh (THREAD, Universe::finalizer_register_method());
1392   JavaCalls::call(&result, mh, &args, CHECK_NULL);
1393   return h_i();
1394 }
1395 
1396 instanceOop InstanceKlass::allocate_instance(TRAPS) {
1397   bool has_finalizer_flag = has_finalizer(); // Query before possible GC
1398   int size = size_helper();  // Query before forming handle.
1399 
1400   instanceOop i;
1401 
1402   i = (instanceOop)Universe::heap()->obj_allocate(this, size, CHECK_NULL);
1403   if (has_finalizer_flag && !RegisterFinalizersAtInit) {
1404     i = register_finalizer(i, CHECK_NULL);
1405   }
1406   return i;
1407 }
1408 
1409 instanceHandle InstanceKlass::allocate_instance_handle(TRAPS) {
1410   return instanceHandle(THREAD, allocate_instance(THREAD));
1411 }
1412 
1413 void InstanceKlass::check_valid_for_instantiation(bool throwError, TRAPS) {
1414   if (is_interface() || is_abstract()) {
1415     ResourceMark rm(THREAD);
1416     THROW_MSG(throwError ? vmSymbols::java_lang_InstantiationError()
1417               : vmSymbols::java_lang_InstantiationException(), external_name());
1418   }
1419   if (this == SystemDictionary::Class_klass()) {
1420     ResourceMark rm(THREAD);
1421     THROW_MSG(throwError ? vmSymbols::java_lang_IllegalAccessError()
1422               : vmSymbols::java_lang_IllegalAccessException(), external_name());
1423   }
1424 }
1425 
1426 Klass* InstanceKlass::array_klass_impl(ArrayStorageProperties storage_props, bool or_null, int n, TRAPS) {
1427   assert(storage_props.is_empty(), "Unexpected");
1428   // Need load-acquire for lock-free read
1429   if (array_klasses_acquire() == NULL) {
1430     if (or_null) return NULL;
1431 
1432     ResourceMark rm;
1433     {
1434       // Atomic creation of array_klasses
1435       MutexLocker ma(MultiArray_lock, THREAD);
1436 
1437       // Check if update has already taken place
1438       if (array_klasses() == NULL) {
1439         Klass*    k = ObjArrayKlass::allocate_objArray_klass(storage_props, 1, this, CHECK_NULL);
1440         // use 'release' to pair with lock-free load
1441         release_set_array_klasses(k);
1442       }
1443     }
1444   }
1445   // _this will always be set at this point
1446   ObjArrayKlass* oak = (ObjArrayKlass*)array_klasses();
1447   if (or_null) {
1448     return oak->array_klass_or_null(storage_props, n);
1449   }
1450   return oak->array_klass(storage_props, n, THREAD);
1451 }
1452 
1453 Klass* InstanceKlass::array_klass_impl(ArrayStorageProperties storage_props, bool or_null, TRAPS) {
1454   return array_klass_impl(storage_props, or_null, 1, THREAD);
1455 }
1456 
1457 static int call_class_initializer_counter = 0;   // for debugging
1458 
1459 Method* InstanceKlass::class_initializer() const {
1460   Method* clinit = find_method(
1461       vmSymbols::class_initializer_name(), vmSymbols::void_method_signature());
1462   if (clinit != NULL && clinit->is_class_initializer()) {
1463     return clinit;
1464   }
1465   return NULL;
1466 }
1467 
1468 void InstanceKlass::call_class_initializer(TRAPS) {
1469   if (ReplayCompiles &&
1470       (ReplaySuppressInitializers == 1 ||
1471        (ReplaySuppressInitializers >= 2 && class_loader() != NULL))) {
1472     // Hide the existence of the initializer for the purpose of replaying the compile
1473     return;
1474   }
1475 
1476   methodHandle h_method(THREAD, class_initializer());
1477   assert(!is_initialized(), "we cannot initialize twice");
1478   LogTarget(Info, class, init) lt;
1479   if (lt.is_enabled()) {
1480     ResourceMark rm;
1481     LogStream ls(lt);
1482     ls.print("%d Initializing ", call_class_initializer_counter++);
1483     name()->print_value_on(&ls);
1484     ls.print_cr("%s (" INTPTR_FORMAT ")", h_method() == NULL ? "(no method)" : "", p2i(this));
1485   }
1486   if (h_method() != NULL) {
1487     JavaCallArguments args; // No arguments
1488     JavaValue result(T_VOID);
1489     JavaCalls::call(&result, h_method, &args, CHECK); // Static call (no args)
1490   }
1491 }
1492 
1493 
1494 void InstanceKlass::mask_for(const methodHandle& method, int bci,
1495   InterpreterOopMap* entry_for) {
1496   // Lazily create the _oop_map_cache at first request
1497   // Lock-free access requires load_acquire.
1498   OopMapCache* oop_map_cache = OrderAccess::load_acquire(&_oop_map_cache);
1499   if (oop_map_cache == NULL) {
1500     MutexLocker x(OopMapCacheAlloc_lock,  Mutex::_no_safepoint_check_flag);
1501     // Check if _oop_map_cache was allocated while we were waiting for this lock
1502     if ((oop_map_cache = _oop_map_cache) == NULL) {
1503       oop_map_cache = new OopMapCache();
1504       // Ensure _oop_map_cache is stable, since it is examined without a lock
1505       OrderAccess::release_store(&_oop_map_cache, oop_map_cache);
1506     }
1507   }
1508   // _oop_map_cache is constant after init; lookup below does its own locking.
1509   oop_map_cache->lookup(method, bci, entry_for);
1510 }
1511 
1512 
1513 bool InstanceKlass::find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1514   for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1515     Symbol* f_name = fs.name();
1516     Symbol* f_sig  = fs.signature();
1517     if (f_name == name && f_sig == sig) {
1518       fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index());
1519       return true;
1520     }
1521   }
1522   return false;
1523 }
1524 
1525 
1526 Klass* InstanceKlass::find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1527   const int n = local_interfaces()->length();
1528   for (int i = 0; i < n; i++) {
1529     Klass* intf1 = local_interfaces()->at(i);
1530     assert(intf1->is_interface(), "just checking type");
1531     // search for field in current interface
1532     if (InstanceKlass::cast(intf1)->find_local_field(name, sig, fd)) {
1533       assert(fd->is_static(), "interface field must be static");
1534       return intf1;
1535     }
1536     // search for field in direct superinterfaces
1537     Klass* intf2 = InstanceKlass::cast(intf1)->find_interface_field(name, sig, fd);
1538     if (intf2 != NULL) return intf2;
1539   }
1540   // otherwise field lookup fails
1541   return NULL;
1542 }
1543 
1544 
1545 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1546   // search order according to newest JVM spec (5.4.3.2, p.167).
1547   // 1) search for field in current klass
1548   if (find_local_field(name, sig, fd)) {
1549     return const_cast<InstanceKlass*>(this);
1550   }
1551   // 2) search for field recursively in direct superinterfaces
1552   { Klass* intf = find_interface_field(name, sig, fd);
1553     if (intf != NULL) return intf;
1554   }
1555   // 3) apply field lookup recursively if superclass exists
1556   { Klass* supr = super();
1557     if (supr != NULL) return InstanceKlass::cast(supr)->find_field(name, sig, fd);
1558   }
1559   // 4) otherwise field lookup fails
1560   return NULL;
1561 }
1562 
1563 
1564 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const {
1565   // search order according to newest JVM spec (5.4.3.2, p.167).
1566   // 1) search for field in current klass
1567   if (find_local_field(name, sig, fd)) {
1568     if (fd->is_static() == is_static) return const_cast<InstanceKlass*>(this);
1569   }
1570   // 2) search for field recursively in direct superinterfaces
1571   if (is_static) {
1572     Klass* intf = find_interface_field(name, sig, fd);
1573     if (intf != NULL) return intf;
1574   }
1575   // 3) apply field lookup recursively if superclass exists
1576   { Klass* supr = super();
1577     if (supr != NULL) return InstanceKlass::cast(supr)->find_field(name, sig, is_static, fd);
1578   }
1579   // 4) otherwise field lookup fails
1580   return NULL;
1581 }
1582 
1583 
1584 bool InstanceKlass::find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
1585   for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1586     if (fs.offset() == offset) {
1587       fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index());
1588       if (fd->is_static() == is_static) return true;
1589     }
1590   }
1591   return false;
1592 }
1593 
1594 
1595 bool InstanceKlass::find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
1596   Klass* klass = const_cast<InstanceKlass*>(this);
1597   while (klass != NULL) {
1598     if (InstanceKlass::cast(klass)->find_local_field_from_offset(offset, is_static, fd)) {
1599       return true;
1600     }
1601     klass = klass->super();
1602   }
1603   return false;
1604 }
1605 
1606 
1607 void InstanceKlass::methods_do(void f(Method* method)) {
1608   // Methods aren't stable until they are loaded.  This can be read outside
1609   // a lock through the ClassLoaderData for profiling
1610   if (!is_loaded()) {
1611     return;
1612   }
1613 
1614   int len = methods()->length();
1615   for (int index = 0; index < len; index++) {
1616     Method* m = methods()->at(index);
1617     assert(m->is_method(), "must be method");
1618     f(m);
1619   }
1620 }
1621 
1622 
1623 void InstanceKlass::do_local_static_fields(FieldClosure* cl) {
1624   for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1625     if (fs.access_flags().is_static()) {
1626       fieldDescriptor& fd = fs.field_descriptor();
1627       cl->do_field(&fd);
1628     }
1629   }
1630 }
1631 
1632 
1633 void InstanceKlass::do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle mirror, TRAPS) {
1634   for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1635     if (fs.access_flags().is_static()) {
1636       fieldDescriptor& fd = fs.field_descriptor();
1637       f(&fd, mirror, CHECK);
1638     }
1639   }
1640 }
1641 
1642 
1643 static int compare_fields_by_offset(int* a, int* b) {
1644   return a[0] - b[0];
1645 }
1646 
1647 void InstanceKlass::do_nonstatic_fields(FieldClosure* cl) {
1648   InstanceKlass* super = superklass();
1649   if (super != NULL) {
1650     super->do_nonstatic_fields(cl);
1651   }
1652   fieldDescriptor fd;
1653   int length = java_fields_count();
1654   // In DebugInfo nonstatic fields are sorted by offset.
1655   int* fields_sorted = NEW_C_HEAP_ARRAY(int, 2*(length+1), mtClass);
1656   int j = 0;
1657   for (int i = 0; i < length; i += 1) {
1658     fd.reinitialize(this, i);
1659     if (!fd.is_static()) {
1660       fields_sorted[j + 0] = fd.offset();
1661       fields_sorted[j + 1] = i;
1662       j += 2;
1663     }
1664   }
1665   if (j > 0) {
1666     length = j;
1667     // _sort_Fn is defined in growableArray.hpp.
1668     qsort(fields_sorted, length/2, 2*sizeof(int), (_sort_Fn)compare_fields_by_offset);
1669     for (int i = 0; i < length; i += 2) {
1670       fd.reinitialize(this, fields_sorted[i + 1]);
1671       assert(!fd.is_static() && fd.offset() == fields_sorted[i], "only nonstatic fields");
1672       cl->do_field(&fd);
1673     }
1674   }
1675   FREE_C_HEAP_ARRAY(int, fields_sorted);
1676 }
1677 
1678 
1679 void InstanceKlass::array_klasses_do(void f(Klass* k)) {
1680   if (array_klasses() != NULL)
1681     ArrayKlass::cast(array_klasses())->array_klasses_do(f);
1682 }
1683 
1684 #ifdef ASSERT
1685 static int linear_search(const Array<Method*>* methods,
1686                          const Symbol* name,
1687                          const Symbol* signature) {
1688   const int len = methods->length();
1689   for (int index = 0; index < len; index++) {
1690     const Method* const m = methods->at(index);
1691     assert(m->is_method(), "must be method");
1692     if (m->signature() == signature && m->name() == name) {
1693        return index;
1694     }
1695   }
1696   return -1;
1697 }
1698 #endif
1699 
1700 static int binary_search(const Array<Method*>* methods, const Symbol* name) {
1701   int len = methods->length();
1702   // methods are sorted, so do binary search
1703   int l = 0;
1704   int h = len - 1;
1705   while (l <= h) {
1706     int mid = (l + h) >> 1;
1707     Method* m = methods->at(mid);
1708     assert(m->is_method(), "must be method");
1709     int res = m->name()->fast_compare(name);
1710     if (res == 0) {
1711       return mid;
1712     } else if (res < 0) {
1713       l = mid + 1;
1714     } else {
1715       h = mid - 1;
1716     }
1717   }
1718   return -1;
1719 }
1720 
1721 // find_method looks up the name/signature in the local methods array
1722 Method* InstanceKlass::find_method(const Symbol* name,
1723                                    const Symbol* signature) const {
1724   return find_method_impl(name, signature, find_overpass, find_static, find_private);
1725 }
1726 
1727 Method* InstanceKlass::find_method_impl(const Symbol* name,
1728                                         const Symbol* signature,
1729                                         OverpassLookupMode overpass_mode,
1730                                         StaticLookupMode static_mode,
1731                                         PrivateLookupMode private_mode) const {
1732   return InstanceKlass::find_method_impl(methods(),
1733                                          name,
1734                                          signature,
1735                                          overpass_mode,
1736                                          static_mode,
1737                                          private_mode);
1738 }
1739 
1740 // find_instance_method looks up the name/signature in the local methods array
1741 // and skips over static methods
1742 Method* InstanceKlass::find_instance_method(const Array<Method*>* methods,
1743                                             const Symbol* name,
1744                                             const Symbol* signature,
1745                                             PrivateLookupMode private_mode) {
1746   Method* const meth = InstanceKlass::find_method_impl(methods,
1747                                                  name,
1748                                                  signature,
1749                                                  find_overpass,
1750                                                  skip_static,
1751                                                  private_mode);
1752   assert(((meth == NULL) || !meth->is_static()),
1753     "find_instance_method should have skipped statics");
1754   return meth;
1755 }
1756 
1757 // find_instance_method looks up the name/signature in the local methods array
1758 // and skips over static methods
1759 Method* InstanceKlass::find_instance_method(const Symbol* name,
1760                                             const Symbol* signature,
1761                                             PrivateLookupMode private_mode) const {
1762   return InstanceKlass::find_instance_method(methods(), name, signature, 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 Symbol* name,
1771                                          const Symbol* signature,
1772                                          OverpassLookupMode overpass_mode,
1773                                          StaticLookupMode static_mode,
1774                                          PrivateLookupMode private_mode) const {
1775   return InstanceKlass::find_method_impl(methods(),
1776                                          name,
1777                                          signature,
1778                                          overpass_mode,
1779                                          static_mode,
1780                                          private_mode);
1781 }
1782 
1783 // Find looks up the name/signature in the local methods array
1784 // and filters on the overpass, static and private flags
1785 // This returns the first one found
1786 // note that the local methods array can have up to one overpass, one static
1787 // and one instance (private or not) with the same name/signature
1788 Method* InstanceKlass::find_local_method(const Array<Method*>* methods,
1789                                          const Symbol* name,
1790                                          const Symbol* signature,
1791                                          OverpassLookupMode overpass_mode,
1792                                          StaticLookupMode static_mode,
1793                                          PrivateLookupMode private_mode) {
1794   return InstanceKlass::find_method_impl(methods,
1795                                          name,
1796                                          signature,
1797                                          overpass_mode,
1798                                          static_mode,
1799                                          private_mode);
1800 }
1801 
1802 Method* InstanceKlass::find_method(const Array<Method*>* methods,
1803                                    const Symbol* name,
1804                                    const Symbol* signature) {
1805   return InstanceKlass::find_method_impl(methods,
1806                                          name,
1807                                          signature,
1808                                          find_overpass,
1809                                          find_static,
1810                                          find_private);
1811 }
1812 
1813 Method* InstanceKlass::find_method_impl(const Array<Method*>* methods,
1814                                         const Symbol* name,
1815                                         const Symbol* signature,
1816                                         OverpassLookupMode overpass_mode,
1817                                         StaticLookupMode static_mode,
1818                                         PrivateLookupMode private_mode) {
1819   int hit = find_method_index(methods, name, signature, overpass_mode, static_mode, private_mode);
1820   return hit >= 0 ? methods->at(hit): NULL;
1821 }
1822 
1823 // true if method matches signature and conforms to skipping_X conditions.
1824 static bool method_matches(const Method* m,
1825                            const Symbol* signature,
1826                            bool skipping_overpass,
1827                            bool skipping_static,
1828                            bool skipping_private) {
1829   return ((m->signature() == signature) &&
1830     (!skipping_overpass || !m->is_overpass()) &&
1831     (!skipping_static || !m->is_static()) &&
1832     (!skipping_private || !m->is_private()));
1833 }
1834 
1835 // Used directly for default_methods to find the index into the
1836 // default_vtable_indices, and indirectly by find_method
1837 // find_method_index looks in the local methods array to return the index
1838 // of the matching name/signature. If, overpass methods are being ignored,
1839 // the search continues to find a potential non-overpass match.  This capability
1840 // is important during method resolution to prefer a static method, for example,
1841 // over an overpass method.
1842 // There is the possibility in any _method's array to have the same name/signature
1843 // for a static method, an overpass method and a local instance method
1844 // To correctly catch a given method, the search criteria may need
1845 // to explicitly skip the other two. For local instance methods, it
1846 // is often necessary to skip private methods
1847 int InstanceKlass::find_method_index(const Array<Method*>* methods,
1848                                      const Symbol* name,
1849                                      const Symbol* signature,
1850                                      OverpassLookupMode overpass_mode,
1851                                      StaticLookupMode static_mode,
1852                                      PrivateLookupMode private_mode) {
1853   const bool skipping_overpass = (overpass_mode == skip_overpass);
1854   const bool skipping_static = (static_mode == skip_static);
1855   const bool skipping_private = (private_mode == skip_private);
1856   const int hit = binary_search(methods, name);
1857   if (hit != -1) {
1858     const Method* const m = methods->at(hit);
1859 
1860     // Do linear search to find matching signature.  First, quick check
1861     // for common case, ignoring overpasses if requested.
1862     if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
1863       return hit;
1864     }
1865 
1866     // search downwards through overloaded methods
1867     int i;
1868     for (i = hit - 1; i >= 0; --i) {
1869         const Method* const m = methods->at(i);
1870         assert(m->is_method(), "must be method");
1871         if (m->name() != name) {
1872           break;
1873         }
1874         if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
1875           return i;
1876         }
1877     }
1878     // search upwards
1879     for (i = hit + 1; i < methods->length(); ++i) {
1880         const Method* const m = methods->at(i);
1881         assert(m->is_method(), "must be method");
1882         if (m->name() != name) {
1883           break;
1884         }
1885         if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
1886           return i;
1887         }
1888     }
1889     // not found
1890 #ifdef ASSERT
1891     const int index = (skipping_overpass || skipping_static || skipping_private) ? -1 :
1892       linear_search(methods, name, signature);
1893     assert(-1 == index, "binary search should have found entry %d", index);
1894 #endif
1895   }
1896   return -1;
1897 }
1898 
1899 int InstanceKlass::find_method_by_name(const Symbol* name, int* end) const {
1900   return find_method_by_name(methods(), name, end);
1901 }
1902 
1903 int InstanceKlass::find_method_by_name(const Array<Method*>* methods,
1904                                        const Symbol* name,
1905                                        int* end_ptr) {
1906   assert(end_ptr != NULL, "just checking");
1907   int start = binary_search(methods, name);
1908   int end = start + 1;
1909   if (start != -1) {
1910     while (start - 1 >= 0 && (methods->at(start - 1))->name() == name) --start;
1911     while (end < methods->length() && (methods->at(end))->name() == name) ++end;
1912     *end_ptr = end;
1913     return start;
1914   }
1915   return -1;
1916 }
1917 
1918 // uncached_lookup_method searches both the local class methods array and all
1919 // superclasses methods arrays, skipping any overpass methods in superclasses,
1920 // and possibly skipping private methods.
1921 Method* InstanceKlass::uncached_lookup_method(const Symbol* name,
1922                                               const Symbol* signature,
1923                                               OverpassLookupMode overpass_mode,
1924                                               PrivateLookupMode private_mode) const {
1925   OverpassLookupMode overpass_local_mode = overpass_mode;
1926   const Klass* klass = this;
1927   while (klass != NULL) {
1928     Method* const method = InstanceKlass::cast(klass)->find_method_impl(name,
1929                                                                         signature,
1930                                                                         overpass_local_mode,
1931                                                                         find_static,
1932                                                                         private_mode);
1933     if (method != NULL) {
1934       return method;
1935     }
1936     if (name == vmSymbols::object_initializer_name()) {
1937       break;  // <init> is never inherited, not even as a static factory
1938     }
1939     klass = klass->super();
1940     overpass_local_mode = skip_overpass;   // Always ignore overpass methods in superclasses
1941   }
1942   return NULL;
1943 }
1944 
1945 #ifdef ASSERT
1946 // search through class hierarchy and return true if this class or
1947 // one of the superclasses was redefined
1948 bool InstanceKlass::has_redefined_this_or_super() const {
1949   const Klass* klass = this;
1950   while (klass != NULL) {
1951     if (InstanceKlass::cast(klass)->has_been_redefined()) {
1952       return true;
1953     }
1954     klass = klass->super();
1955   }
1956   return false;
1957 }
1958 #endif
1959 
1960 // lookup a method in the default methods list then in all transitive interfaces
1961 // Do NOT return private or static methods
1962 Method* InstanceKlass::lookup_method_in_ordered_interfaces(Symbol* name,
1963                                                          Symbol* signature) const {
1964   Method* m = NULL;
1965   if (default_methods() != NULL) {
1966     m = find_method(default_methods(), name, signature);
1967   }
1968   // Look up interfaces
1969   if (m == NULL) {
1970     m = lookup_method_in_all_interfaces(name, signature, find_defaults);
1971   }
1972   return m;
1973 }
1974 
1975 // lookup a method in all the interfaces that this class implements
1976 // Do NOT return private or static methods, new in JDK8 which are not externally visible
1977 // They should only be found in the initial InterfaceMethodRef
1978 Method* InstanceKlass::lookup_method_in_all_interfaces(Symbol* name,
1979                                                        Symbol* signature,
1980                                                        DefaultsLookupMode defaults_mode) const {
1981   Array<InstanceKlass*>* all_ifs = transitive_interfaces();
1982   int num_ifs = all_ifs->length();
1983   InstanceKlass *ik = NULL;
1984   for (int i = 0; i < num_ifs; i++) {
1985     ik = all_ifs->at(i);
1986     Method* m = ik->lookup_method(name, signature);
1987     if (m != NULL && m->is_public() && !m->is_static() &&
1988         ((defaults_mode != skip_defaults) || !m->is_default_method())) {
1989       return m;
1990     }
1991   }
1992   return NULL;
1993 }
1994 
1995 /* jni_id_for_impl for jfieldIds only */
1996 JNIid* InstanceKlass::jni_id_for_impl(int offset) {
1997   MutexLocker ml(JfieldIdCreation_lock);
1998   // Retry lookup after we got the lock
1999   JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset);
2000   if (probe == NULL) {
2001     // Slow case, allocate new static field identifier
2002     probe = new JNIid(this, offset, jni_ids());
2003     set_jni_ids(probe);
2004   }
2005   return probe;
2006 }
2007 
2008 
2009 /* jni_id_for for jfieldIds only */
2010 JNIid* InstanceKlass::jni_id_for(int offset) {
2011   JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset);
2012   if (probe == NULL) {
2013     probe = jni_id_for_impl(offset);
2014   }
2015   return probe;
2016 }
2017 
2018 u2 InstanceKlass::enclosing_method_data(int offset) const {
2019   const Array<jushort>* const inner_class_list = inner_classes();
2020   if (inner_class_list == NULL) {
2021     return 0;
2022   }
2023   const int length = inner_class_list->length();
2024   if (length % inner_class_next_offset == 0) {
2025     return 0;
2026   }
2027   const int index = length - enclosing_method_attribute_size;
2028   assert(offset < enclosing_method_attribute_size, "invalid offset");
2029   return inner_class_list->at(index + offset);
2030 }
2031 
2032 void InstanceKlass::set_enclosing_method_indices(u2 class_index,
2033                                                  u2 method_index) {
2034   Array<jushort>* inner_class_list = inner_classes();
2035   assert (inner_class_list != NULL, "_inner_classes list is not set up");
2036   int length = inner_class_list->length();
2037   if (length % inner_class_next_offset == enclosing_method_attribute_size) {
2038     int index = length - enclosing_method_attribute_size;
2039     inner_class_list->at_put(
2040       index + enclosing_method_class_index_offset, class_index);
2041     inner_class_list->at_put(
2042       index + enclosing_method_method_index_offset, method_index);
2043   }
2044 }
2045 
2046 // Lookup or create a jmethodID.
2047 // This code is called by the VMThread and JavaThreads so the
2048 // locking has to be done very carefully to avoid deadlocks
2049 // and/or other cache consistency problems.
2050 //
2051 jmethodID InstanceKlass::get_jmethod_id(const methodHandle& method_h) {
2052   size_t idnum = (size_t)method_h->method_idnum();
2053   jmethodID* jmeths = methods_jmethod_ids_acquire();
2054   size_t length = 0;
2055   jmethodID id = NULL;
2056 
2057   // We use a double-check locking idiom here because this cache is
2058   // performance sensitive. In the normal system, this cache only
2059   // transitions from NULL to non-NULL which is safe because we use
2060   // release_set_methods_jmethod_ids() to advertise the new cache.
2061   // A partially constructed cache should never be seen by a racing
2062   // thread. We also use release_store() to save a new jmethodID
2063   // in the cache so a partially constructed jmethodID should never be
2064   // seen either. Cache reads of existing jmethodIDs proceed without a
2065   // lock, but cache writes of a new jmethodID requires uniqueness and
2066   // creation of the cache itself requires no leaks so a lock is
2067   // generally acquired in those two cases.
2068   //
2069   // If the RedefineClasses() API has been used, then this cache can
2070   // grow and we'll have transitions from non-NULL to bigger non-NULL.
2071   // Cache creation requires no leaks and we require safety between all
2072   // cache accesses and freeing of the old cache so a lock is generally
2073   // acquired when the RedefineClasses() API has been used.
2074 
2075   if (jmeths != NULL) {
2076     // the cache already exists
2077     if (!idnum_can_increment()) {
2078       // the cache can't grow so we can just get the current values
2079       get_jmethod_id_length_value(jmeths, idnum, &length, &id);
2080     } else {
2081       // cache can grow so we have to be more careful
2082       if (Threads::number_of_threads() == 0 ||
2083           SafepointSynchronize::is_at_safepoint()) {
2084         // we're single threaded or at a safepoint - no locking needed
2085         get_jmethod_id_length_value(jmeths, idnum, &length, &id);
2086       } else {
2087         MutexLocker ml(JmethodIdCreation_lock);
2088         get_jmethod_id_length_value(jmeths, idnum, &length, &id);
2089       }
2090     }
2091   }
2092   // implied else:
2093   // we need to allocate a cache so default length and id values are good
2094 
2095   if (jmeths == NULL ||   // no cache yet
2096       length <= idnum ||  // cache is too short
2097       id == NULL) {       // cache doesn't contain entry
2098 
2099     // This function can be called by the VMThread so we have to do all
2100     // things that might block on a safepoint before grabbing the lock.
2101     // Otherwise, we can deadlock with the VMThread or have a cache
2102     // consistency issue. These vars keep track of what we might have
2103     // to free after the lock is dropped.
2104     jmethodID  to_dealloc_id     = NULL;
2105     jmethodID* to_dealloc_jmeths = NULL;
2106 
2107     // may not allocate new_jmeths or use it if we allocate it
2108     jmethodID* new_jmeths = NULL;
2109     if (length <= idnum) {
2110       // allocate a new cache that might be used
2111       size_t size = MAX2(idnum+1, (size_t)idnum_allocated_count());
2112       new_jmeths = NEW_C_HEAP_ARRAY(jmethodID, size+1, mtClass);
2113       memset(new_jmeths, 0, (size+1)*sizeof(jmethodID));
2114       // cache size is stored in element[0], other elements offset by one
2115       new_jmeths[0] = (jmethodID)size;
2116     }
2117 
2118     // allocate a new jmethodID that might be used
2119     jmethodID new_id = NULL;
2120     if (method_h->is_old() && !method_h->is_obsolete()) {
2121       // The method passed in is old (but not obsolete), we need to use the current version
2122       Method* current_method = method_with_idnum((int)idnum);
2123       assert(current_method != NULL, "old and but not obsolete, so should exist");
2124       new_id = Method::make_jmethod_id(class_loader_data(), current_method);
2125     } else {
2126       // It is the current version of the method or an obsolete method,
2127       // use the version passed in
2128       new_id = Method::make_jmethod_id(class_loader_data(), method_h());
2129     }
2130 
2131     if (Threads::number_of_threads() == 0 ||
2132         SafepointSynchronize::is_at_safepoint()) {
2133       // we're single threaded or at a safepoint - no locking needed
2134       id = get_jmethod_id_fetch_or_update(idnum, new_id, new_jmeths,
2135                                           &to_dealloc_id, &to_dealloc_jmeths);
2136     } else {
2137       MutexLocker ml(JmethodIdCreation_lock);
2138       id = get_jmethod_id_fetch_or_update(idnum, new_id, new_jmeths,
2139                                           &to_dealloc_id, &to_dealloc_jmeths);
2140     }
2141 
2142     // The lock has been dropped so we can free resources.
2143     // Free up either the old cache or the new cache if we allocated one.
2144     if (to_dealloc_jmeths != NULL) {
2145       FreeHeap(to_dealloc_jmeths);
2146     }
2147     // free up the new ID since it wasn't needed
2148     if (to_dealloc_id != NULL) {
2149       Method::destroy_jmethod_id(class_loader_data(), to_dealloc_id);
2150     }
2151   }
2152   return id;
2153 }
2154 
2155 // Figure out how many jmethodIDs haven't been allocated, and make
2156 // sure space for them is pre-allocated.  This makes getting all
2157 // method ids much, much faster with classes with more than 8
2158 // methods, and has a *substantial* effect on performance with jvmti
2159 // code that loads all jmethodIDs for all classes.
2160 void InstanceKlass::ensure_space_for_methodids(int start_offset) {
2161   int new_jmeths = 0;
2162   int length = methods()->length();
2163   for (int index = start_offset; index < length; index++) {
2164     Method* m = methods()->at(index);
2165     jmethodID id = m->find_jmethod_id_or_null();
2166     if (id == NULL) {
2167       new_jmeths++;
2168     }
2169   }
2170   if (new_jmeths != 0) {
2171     Method::ensure_jmethod_ids(class_loader_data(), new_jmeths);
2172   }
2173 }
2174 
2175 // Common code to fetch the jmethodID from the cache or update the
2176 // cache with the new jmethodID. This function should never do anything
2177 // that causes the caller to go to a safepoint or we can deadlock with
2178 // the VMThread or have cache consistency issues.
2179 //
2180 jmethodID InstanceKlass::get_jmethod_id_fetch_or_update(
2181             size_t idnum, jmethodID new_id,
2182             jmethodID* new_jmeths, jmethodID* to_dealloc_id_p,
2183             jmethodID** to_dealloc_jmeths_p) {
2184   assert(new_id != NULL, "sanity check");
2185   assert(to_dealloc_id_p != NULL, "sanity check");
2186   assert(to_dealloc_jmeths_p != NULL, "sanity check");
2187   assert(Threads::number_of_threads() == 0 ||
2188          SafepointSynchronize::is_at_safepoint() ||
2189          JmethodIdCreation_lock->owned_by_self(), "sanity check");
2190 
2191   // reacquire the cache - we are locked, single threaded or at a safepoint
2192   jmethodID* jmeths = methods_jmethod_ids_acquire();
2193   jmethodID  id     = NULL;
2194   size_t     length = 0;
2195 
2196   if (jmeths == NULL ||                         // no cache yet
2197       (length = (size_t)jmeths[0]) <= idnum) {  // cache is too short
2198     if (jmeths != NULL) {
2199       // copy any existing entries from the old cache
2200       for (size_t index = 0; index < length; index++) {
2201         new_jmeths[index+1] = jmeths[index+1];
2202       }
2203       *to_dealloc_jmeths_p = jmeths;  // save old cache for later delete
2204     }
2205     release_set_methods_jmethod_ids(jmeths = new_jmeths);
2206   } else {
2207     // fetch jmethodID (if any) from the existing cache
2208     id = jmeths[idnum+1];
2209     *to_dealloc_jmeths_p = new_jmeths;  // save new cache for later delete
2210   }
2211   if (id == NULL) {
2212     // No matching jmethodID in the existing cache or we have a new
2213     // cache or we just grew the cache. This cache write is done here
2214     // by the first thread to win the foot race because a jmethodID
2215     // needs to be unique once it is generally available.
2216     id = new_id;
2217 
2218     // The jmethodID cache can be read while unlocked so we have to
2219     // make sure the new jmethodID is complete before installing it
2220     // in the cache.
2221     OrderAccess::release_store(&jmeths[idnum+1], id);
2222   } else {
2223     *to_dealloc_id_p = new_id; // save new id for later delete
2224   }
2225   return id;
2226 }
2227 
2228 
2229 // Common code to get the jmethodID cache length and the jmethodID
2230 // value at index idnum if there is one.
2231 //
2232 void InstanceKlass::get_jmethod_id_length_value(jmethodID* cache,
2233        size_t idnum, size_t *length_p, jmethodID* id_p) {
2234   assert(cache != NULL, "sanity check");
2235   assert(length_p != NULL, "sanity check");
2236   assert(id_p != NULL, "sanity check");
2237 
2238   // cache size is stored in element[0], other elements offset by one
2239   *length_p = (size_t)cache[0];
2240   if (*length_p <= idnum) {  // cache is too short
2241     *id_p = NULL;
2242   } else {
2243     *id_p = cache[idnum+1];  // fetch jmethodID (if any)
2244   }
2245 }
2246 
2247 
2248 // Lookup a jmethodID, NULL if not found.  Do no blocking, no allocations, no handles
2249 jmethodID InstanceKlass::jmethod_id_or_null(Method* method) {
2250   size_t idnum = (size_t)method->method_idnum();
2251   jmethodID* jmeths = methods_jmethod_ids_acquire();
2252   size_t length;                                // length assigned as debugging crumb
2253   jmethodID id = NULL;
2254   if (jmeths != NULL &&                         // If there is a cache
2255       (length = (size_t)jmeths[0]) > idnum) {   // and if it is long enough,
2256     id = jmeths[idnum+1];                       // Look up the id (may be NULL)
2257   }
2258   return id;
2259 }
2260 
2261 inline DependencyContext InstanceKlass::dependencies() {
2262   DependencyContext dep_context(&_dep_context, &_dep_context_last_cleaned);
2263   return dep_context;
2264 }
2265 
2266 int InstanceKlass::mark_dependent_nmethods(KlassDepChange& changes) {
2267   return dependencies().mark_dependent_nmethods(changes);
2268 }
2269 
2270 void InstanceKlass::add_dependent_nmethod(nmethod* nm) {
2271   dependencies().add_dependent_nmethod(nm);
2272 }
2273 
2274 void InstanceKlass::remove_dependent_nmethod(nmethod* nm) {
2275   dependencies().remove_dependent_nmethod(nm);
2276 }
2277 
2278 void InstanceKlass::clean_dependency_context() {
2279   dependencies().clean_unloading_dependents();
2280 }
2281 
2282 #ifndef PRODUCT
2283 void InstanceKlass::print_dependent_nmethods(bool verbose) {
2284   dependencies().print_dependent_nmethods(verbose);
2285 }
2286 
2287 bool InstanceKlass::is_dependent_nmethod(nmethod* nm) {
2288   return dependencies().is_dependent_nmethod(nm);
2289 }
2290 #endif //PRODUCT
2291 
2292 void InstanceKlass::clean_weak_instanceklass_links() {
2293   clean_implementors_list();
2294   clean_method_data();
2295 }
2296 
2297 void InstanceKlass::clean_implementors_list() {
2298   assert(is_loader_alive(), "this klass should be live");
2299   if (is_interface()) {
2300     assert (ClassUnloading, "only called for ClassUnloading");
2301     for (;;) {
2302       // Use load_acquire due to competing with inserts
2303       Klass* impl = OrderAccess::load_acquire(adr_implementor());
2304       if (impl != NULL && !impl->is_loader_alive()) {
2305         // NULL this field, might be an unloaded klass or NULL
2306         Klass* volatile* klass = adr_implementor();
2307         if (Atomic::cmpxchg((Klass*)NULL, klass, impl) == impl) {
2308           // Successfully unlinking implementor.
2309           if (log_is_enabled(Trace, class, unload)) {
2310             ResourceMark rm;
2311             log_trace(class, unload)("unlinking class (implementor): %s", impl->external_name());
2312           }
2313           return;
2314         }
2315       } else {
2316         return;
2317       }
2318     }
2319   }
2320 }
2321 
2322 void InstanceKlass::clean_method_data() {
2323   for (int m = 0; m < methods()->length(); m++) {
2324     MethodData* mdo = methods()->at(m)->method_data();
2325     if (mdo != NULL) {
2326       MutexLocker ml(SafepointSynchronize::is_at_safepoint() ? NULL : mdo->extra_data_lock());
2327       mdo->clean_method_data(/*always_clean*/false);
2328     }
2329   }
2330 }
2331 
2332 bool InstanceKlass::supers_have_passed_fingerprint_checks() {
2333   if (java_super() != NULL && !java_super()->has_passed_fingerprint_check()) {
2334     ResourceMark rm;
2335     log_trace(class, fingerprint)("%s : super %s not fingerprinted", external_name(), java_super()->external_name());
2336     return false;
2337   }
2338 
2339   Array<InstanceKlass*>* local_interfaces = this->local_interfaces();
2340   if (local_interfaces != NULL) {
2341     int length = local_interfaces->length();
2342     for (int i = 0; i < length; i++) {
2343       InstanceKlass* intf = local_interfaces->at(i);
2344       if (!intf->has_passed_fingerprint_check()) {
2345         ResourceMark rm;
2346         log_trace(class, fingerprint)("%s : interface %s not fingerprinted", external_name(), intf->external_name());
2347         return false;
2348       }
2349     }
2350   }
2351 
2352   return true;
2353 }
2354 
2355 bool InstanceKlass::should_store_fingerprint(bool is_unsafe_anonymous) {
2356 #if INCLUDE_AOT
2357   // We store the fingerprint into the InstanceKlass only in the following 2 cases:
2358   if (CalculateClassFingerprint) {
2359     // (1) We are running AOT to generate a shared library.
2360     return true;
2361   }
2362   if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
2363     // (2) We are running -Xshare:dump or -XX:ArchiveClassesAtExit to create a shared archive
2364     return true;
2365   }
2366   if (UseAOT && is_unsafe_anonymous) {
2367     // (3) We are using AOT code from a shared library and see an unsafe anonymous class
2368     return true;
2369   }
2370 #endif
2371 
2372   // In all other cases we might set the _misc_has_passed_fingerprint_check bit,
2373   // but do not store the 64-bit fingerprint to save space.
2374   return false;
2375 }
2376 
2377 bool InstanceKlass::has_stored_fingerprint() const {
2378 #if INCLUDE_AOT
2379   return should_store_fingerprint() || is_shared();
2380 #else
2381   return false;
2382 #endif
2383 }
2384 
2385 uint64_t InstanceKlass::get_stored_fingerprint() const {
2386   address adr = adr_fingerprint();
2387   if (adr != NULL) {
2388     return (uint64_t)Bytes::get_native_u8(adr); // adr may not be 64-bit aligned
2389   }
2390   return 0;
2391 }
2392 
2393 void InstanceKlass::store_fingerprint(uint64_t fingerprint) {
2394   address adr = adr_fingerprint();
2395   if (adr != NULL) {
2396     Bytes::put_native_u8(adr, (u8)fingerprint); // adr may not be 64-bit aligned
2397 
2398     ResourceMark rm;
2399     log_trace(class, fingerprint)("stored as " PTR64_FORMAT " for class %s", fingerprint, external_name());
2400   }
2401 }
2402 
2403 void InstanceKlass::metaspace_pointers_do(MetaspaceClosure* it) {
2404   Klass::metaspace_pointers_do(it);
2405 
2406   if (log_is_enabled(Trace, cds)) {
2407     ResourceMark rm;
2408     log_trace(cds)("Iter(InstanceKlass): %p (%s)", this, external_name());
2409   }
2410 
2411   it->push(&_annotations);
2412   it->push((Klass**)&_array_klasses);
2413   it->push(&_constants);
2414   it->push(&_inner_classes);
2415   it->push(&_array_name);
2416 #if INCLUDE_JVMTI
2417   it->push(&_previous_versions);
2418 #endif
2419   it->push(&_methods);
2420   it->push(&_default_methods);
2421   it->push(&_local_interfaces);
2422   it->push(&_transitive_interfaces);
2423   it->push(&_method_ordering);
2424   it->push(&_default_vtable_indices);
2425   it->push(&_fields);
2426 
2427   if (itable_length() > 0) {
2428     itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable();
2429     int method_table_offset_in_words = ioe->offset()/wordSize;
2430     int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words())
2431                          / itableOffsetEntry::size();
2432 
2433     for (int i = 0; i < nof_interfaces; i ++, ioe ++) {
2434       if (ioe->interface_klass() != NULL) {
2435         it->push(ioe->interface_klass_addr());
2436         itableMethodEntry* ime = ioe->first_method_entry(this);
2437         int n = klassItable::method_count_for_interface(ioe->interface_klass());
2438         for (int index = 0; index < n; index ++) {
2439           it->push(ime[index].method_addr());
2440         }
2441       }
2442     }
2443   }
2444 
2445   it->push(&_nest_members);
2446 }
2447 
2448 void InstanceKlass::remove_unshareable_info() {
2449   Klass::remove_unshareable_info();
2450 
2451   if (is_in_error_state()) {
2452     // Classes are attempted to link during dumping and may fail,
2453     // but these classes are still in the dictionary and class list in CLD.
2454     // Check in_error state first because in_error is > linked state, so
2455     // is_linked() is true.
2456     // If there's a linking error, there is nothing else to remove.
2457     return;
2458   }
2459 
2460   // Reset to the 'allocated' state to prevent any premature accessing to
2461   // a shared class at runtime while the class is still being loaded and
2462   // restored. A class' init_state is set to 'loaded' at runtime when it's
2463   // being added to class hierarchy (see SystemDictionary:::add_to_hierarchy()).
2464   _init_state = allocated;
2465 
2466   {
2467     MutexLocker ml(Compile_lock);
2468     init_implementor();
2469   }
2470 
2471   constants()->remove_unshareable_info();
2472 
2473   for (int i = 0; i < methods()->length(); i++) {
2474     Method* m = methods()->at(i);
2475     m->remove_unshareable_info();
2476   }
2477 
2478   // do array classes also.
2479   if (array_klasses() != NULL) {
2480     array_klasses()->remove_unshareable_info();
2481   }
2482 
2483   // These are not allocated from metaspace. They are safe to set to NULL.
2484   _source_debug_extension = NULL;
2485   _dep_context = NULL;
2486   _osr_nmethods_head = NULL;
2487 #if INCLUDE_JVMTI
2488   _breakpoints = NULL;
2489   _previous_versions = NULL;
2490   _cached_class_file = NULL;
2491 #endif
2492 
2493   _init_thread = NULL;
2494   _methods_jmethod_ids = NULL;
2495   _jni_ids = NULL;
2496   _oop_map_cache = NULL;
2497   // clear _nest_host to ensure re-load at runtime
2498   _nest_host = NULL;
2499 }
2500 
2501 void InstanceKlass::remove_java_mirror() {
2502   Klass::remove_java_mirror();
2503 
2504   // do array classes also.
2505   if (array_klasses() != NULL) {
2506     array_klasses()->remove_java_mirror();
2507   }
2508 }
2509 
2510 void InstanceKlass::restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS) {
2511   // SystemDictionary::add_to_hierarchy() sets the init_state to loaded
2512   // before the InstanceKlass is added to the SystemDictionary. Make
2513   // sure the current state is <loaded.
2514   assert(!is_loaded(), "invalid init state");
2515   set_package(loader_data, CHECK);
2516   Klass::restore_unshareable_info(loader_data, protection_domain, CHECK);
2517 
2518   Array<Method*>* methods = this->methods();
2519   int num_methods = methods->length();
2520   for (int index = 0; index < num_methods; ++index) {
2521     methods->at(index)->restore_unshareable_info(CHECK);
2522   }
2523   if (JvmtiExport::has_redefined_a_class()) {
2524     // Reinitialize vtable because RedefineClasses may have changed some
2525     // entries in this vtable for super classes so the CDS vtable might
2526     // point to old or obsolete entries.  RedefineClasses doesn't fix up
2527     // vtables in the shared system dictionary, only the main one.
2528     // It also redefines the itable too so fix that too.
2529     vtable().initialize_vtable(false, CHECK);
2530     itable().initialize_itable(false, CHECK);
2531   }
2532 
2533   // restore constant pool resolved references
2534   constants()->restore_unshareable_info(CHECK);
2535 
2536   if (array_klasses() != NULL) {
2537     // Array classes have null protection domain.
2538     // --> see ArrayKlass::complete_create_array_klass()
2539     array_klasses()->restore_unshareable_info(ClassLoaderData::the_null_class_loader_data(), Handle(), CHECK);
2540   }
2541 }
2542 
2543 // returns true IFF is_in_error_state() has been changed as a result of this call.
2544 bool InstanceKlass::check_sharing_error_state() {
2545   assert(DumpSharedSpaces, "should only be called during dumping");
2546   bool old_state = is_in_error_state();
2547 
2548   if (!is_in_error_state()) {
2549     bool bad = false;
2550     for (InstanceKlass* sup = java_super(); sup; sup = sup->java_super()) {
2551       if (sup->is_in_error_state()) {
2552         bad = true;
2553         break;
2554       }
2555     }
2556     if (!bad) {
2557       Array<InstanceKlass*>* interfaces = transitive_interfaces();
2558       for (int i = 0; i < interfaces->length(); i++) {
2559         InstanceKlass* iface = interfaces->at(i);
2560         if (iface->is_in_error_state()) {
2561           bad = true;
2562           break;
2563         }
2564       }
2565     }
2566 
2567     if (bad) {
2568       set_in_error_state();
2569     }
2570   }
2571 
2572   return (old_state != is_in_error_state());
2573 }
2574 
2575 void InstanceKlass::set_class_loader_type(s2 loader_type) {
2576   switch (loader_type) {
2577   case ClassLoader::BOOT_LOADER:
2578     _misc_flags |= _misc_is_shared_boot_class;
2579     break;
2580   case ClassLoader::PLATFORM_LOADER:
2581     _misc_flags |= _misc_is_shared_platform_class;
2582     break;
2583   case ClassLoader::APP_LOADER:
2584     _misc_flags |= _misc_is_shared_app_class;
2585     break;
2586   default:
2587     ShouldNotReachHere();
2588     break;
2589   }
2590 }
2591 
2592 #if INCLUDE_JVMTI
2593 static void clear_all_breakpoints(Method* m) {
2594   m->clear_all_breakpoints();
2595 }
2596 #endif
2597 
2598 void InstanceKlass::unload_class(InstanceKlass* ik) {
2599   // Release dependencies.
2600   ik->dependencies().remove_all_dependents();
2601 
2602   // notify the debugger
2603   if (JvmtiExport::should_post_class_unload()) {
2604     JvmtiExport::post_class_unload(ik);
2605   }
2606 
2607   // notify ClassLoadingService of class unload
2608   ClassLoadingService::notify_class_unloaded(ik);
2609 
2610   if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
2611     SystemDictionaryShared::remove_dumptime_info(ik);
2612   }
2613 
2614   if (log_is_enabled(Info, class, unload)) {
2615     ResourceMark rm;
2616     log_info(class, unload)("unloading class %s " INTPTR_FORMAT, ik->external_name(), p2i(ik));
2617   }
2618 
2619   Events::log_class_unloading(Thread::current(), ik);
2620 
2621 #if INCLUDE_JFR
2622   assert(ik != NULL, "invariant");
2623   EventClassUnload event;
2624   event.set_unloadedClass(ik);
2625   event.set_definingClassLoader(ik->class_loader_data());
2626   event.commit();
2627 #endif
2628 }
2629 
2630 void InstanceKlass::release_C_heap_structures(InstanceKlass* ik) {
2631   // Clean up C heap
2632   ik->release_C_heap_structures();
2633   ik->constants()->release_C_heap_structures();
2634 }
2635 
2636 void InstanceKlass::release_C_heap_structures() {
2637   // Can't release the constant pool here because the constant pool can be
2638   // deallocated separately from the InstanceKlass for default methods and
2639   // redefine classes.
2640 
2641   // Deallocate oop map cache
2642   if (_oop_map_cache != NULL) {
2643     delete _oop_map_cache;
2644     _oop_map_cache = NULL;
2645   }
2646 
2647   // Deallocate JNI identifiers for jfieldIDs
2648   JNIid::deallocate(jni_ids());
2649   set_jni_ids(NULL);
2650 
2651   jmethodID* jmeths = methods_jmethod_ids_acquire();
2652   if (jmeths != (jmethodID*)NULL) {
2653     release_set_methods_jmethod_ids(NULL);
2654     FreeHeap(jmeths);
2655   }
2656 
2657   assert(_dep_context == NULL,
2658          "dependencies should already be cleaned");
2659 
2660 #if INCLUDE_JVMTI
2661   // Deallocate breakpoint records
2662   if (breakpoints() != 0x0) {
2663     methods_do(clear_all_breakpoints);
2664     assert(breakpoints() == 0x0, "should have cleared breakpoints");
2665   }
2666 
2667   // deallocate the cached class file
2668   if (_cached_class_file != NULL) {
2669     os::free(_cached_class_file);
2670     _cached_class_file = NULL;
2671   }
2672 #endif
2673 
2674   // Decrement symbol reference counts associated with the unloaded class.
2675   if (_name != NULL) _name->decrement_refcount();
2676   // unreference array name derived from this class name (arrays of an unloaded
2677   // class can't be referenced anymore).
2678   if (_array_name != NULL)  _array_name->decrement_refcount();
2679   if (_value_types != NULL) {
2680     for (int i = 0; i < _value_types->length(); i++) {
2681       Symbol* s = _value_types->at(i)._class_name;
2682       if (s != NULL) {
2683         s->decrement_refcount();
2684       }
2685     }
2686   }
2687   if (_source_debug_extension != NULL) FREE_C_HEAP_ARRAY(char, _source_debug_extension);
2688 }
2689 
2690 void InstanceKlass::set_source_debug_extension(const char* array, int length) {
2691   if (array == NULL) {
2692     _source_debug_extension = NULL;
2693   } else {
2694     // Adding one to the attribute length in order to store a null terminator
2695     // character could cause an overflow because the attribute length is
2696     // already coded with an u4 in the classfile, but in practice, it's
2697     // unlikely to happen.
2698     assert((length+1) > length, "Overflow checking");
2699     char* sde = NEW_C_HEAP_ARRAY(char, (length + 1), mtClass);
2700     for (int i = 0; i < length; i++) {
2701       sde[i] = array[i];
2702     }
2703     sde[length] = '\0';
2704     _source_debug_extension = sde;
2705   }
2706 }
2707 
2708 const char* InstanceKlass::signature_name() const {
2709   return signature_name_of(is_value() ? 'Q' : 'L');
2710 }
2711 
2712 const char* InstanceKlass::signature_name_of(char c) const {
2713   int hash_len = 0;
2714   char hash_buf[40];
2715 
2716   // If this is an unsafe anonymous class, append a hash to make the name unique
2717   if (is_unsafe_anonymous()) {
2718     intptr_t hash = (java_mirror() != NULL) ? java_mirror()->identity_hash() : 0;
2719     jio_snprintf(hash_buf, sizeof(hash_buf), "/" UINTX_FORMAT, (uintx)hash);
2720     hash_len = (int)strlen(hash_buf);
2721   }
2722 
2723   // Get the internal name as a c string
2724   const char* src = (const char*) (name()->as_C_string());
2725   const int src_length = (int)strlen(src);
2726 
2727   char* dest = NEW_RESOURCE_ARRAY(char, src_length + hash_len + 3);
2728 
2729   // Add L or Q as type indicator
2730   int dest_index = 0;
2731   dest[dest_index++] = c;
2732 
2733   // Add the actual class name
2734   for (int src_index = 0; src_index < src_length; ) {
2735     dest[dest_index++] = src[src_index++];
2736   }
2737 
2738   // If we have a hash, append it
2739   for (int hash_index = 0; hash_index < hash_len; ) {
2740     dest[dest_index++] = hash_buf[hash_index++];
2741   }
2742 
2743   // Add the semicolon and the NULL
2744   dest[dest_index++] = ';';
2745   dest[dest_index] = '\0';
2746   return dest;
2747 }
2748 
2749 // Used to obtain the package name from a fully qualified class name.
2750 Symbol* InstanceKlass::package_from_name(const Symbol* name, TRAPS) {
2751   if (name == NULL) {
2752     return NULL;
2753   } else {
2754     if (name->utf8_length() <= 0) {
2755       return NULL;
2756     }
2757     ResourceMark rm;
2758     const char* package_name = ClassLoader::package_from_name((const char*) name->as_C_string());
2759     if (package_name == NULL) {
2760       return NULL;
2761     }
2762     Symbol* pkg_name = SymbolTable::new_symbol(package_name);
2763     return pkg_name;
2764   }
2765 }
2766 
2767 ModuleEntry* InstanceKlass::module() const {
2768   // For an unsafe anonymous class return the host class' module
2769   if (is_unsafe_anonymous()) {
2770     assert(unsafe_anonymous_host() != NULL, "unsafe anonymous class must have a host class");
2771     return unsafe_anonymous_host()->module();
2772   }
2773 
2774   // Class is in a named package
2775   if (!in_unnamed_package()) {
2776     return _package_entry->module();
2777   }
2778 
2779   // Class is in an unnamed package, return its loader's unnamed module
2780   return class_loader_data()->unnamed_module();
2781 }
2782 
2783 void InstanceKlass::set_package(ClassLoaderData* loader_data, TRAPS) {
2784 
2785   // ensure java/ packages only loaded by boot or platform builtin loaders
2786   check_prohibited_package(name(), loader_data, CHECK);
2787 
2788   TempNewSymbol pkg_name = package_from_name(name(), CHECK);
2789 
2790   if (pkg_name != NULL && loader_data != NULL) {
2791 
2792     // Find in class loader's package entry table.
2793     _package_entry = loader_data->packages()->lookup_only(pkg_name);
2794 
2795     // If the package name is not found in the loader's package
2796     // entry table, it is an indication that the package has not
2797     // been defined. Consider it defined within the unnamed module.
2798     if (_package_entry == NULL) {
2799       ResourceMark rm;
2800 
2801       if (!ModuleEntryTable::javabase_defined()) {
2802         // Before java.base is defined during bootstrapping, define all packages in
2803         // the java.base module.  If a non-java.base package is erroneously placed
2804         // in the java.base module it will be caught later when java.base
2805         // is defined by ModuleEntryTable::verify_javabase_packages check.
2806         assert(ModuleEntryTable::javabase_moduleEntry() != NULL, JAVA_BASE_NAME " module is NULL");
2807         _package_entry = loader_data->packages()->lookup(pkg_name, ModuleEntryTable::javabase_moduleEntry());
2808       } else {
2809         assert(loader_data->unnamed_module() != NULL, "unnamed module is NULL");
2810         _package_entry = loader_data->packages()->lookup(pkg_name,
2811                                                          loader_data->unnamed_module());
2812       }
2813 
2814       // A package should have been successfully created
2815       assert(_package_entry != NULL, "Package entry for class %s not found, loader %s",
2816              name()->as_C_string(), loader_data->loader_name_and_id());
2817     }
2818 
2819     if (log_is_enabled(Debug, module)) {
2820       ResourceMark rm;
2821       ModuleEntry* m = _package_entry->module();
2822       log_trace(module)("Setting package: class: %s, package: %s, loader: %s, module: %s",
2823                         external_name(),
2824                         pkg_name->as_C_string(),
2825                         loader_data->loader_name_and_id(),
2826                         (m->is_named() ? m->name()->as_C_string() : UNNAMED_MODULE));
2827     }
2828   } else {
2829     ResourceMark rm;
2830     log_trace(module)("Setting package: class: %s, package: unnamed, loader: %s, module: %s",
2831                       external_name(),
2832                       (loader_data != NULL) ? loader_data->loader_name_and_id() : "NULL",
2833                       UNNAMED_MODULE);
2834   }
2835 }
2836 
2837 
2838 // different versions of is_same_class_package
2839 
2840 bool InstanceKlass::is_same_class_package(const Klass* class2) const {
2841   oop classloader1 = this->class_loader();
2842   PackageEntry* classpkg1 = this->package();
2843   if (class2->is_objArray_klass()) {
2844     class2 = ObjArrayKlass::cast(class2)->bottom_klass();
2845   }
2846 
2847   oop classloader2;
2848   PackageEntry* classpkg2;
2849   if (class2->is_instance_klass()) {
2850     classloader2 = class2->class_loader();
2851     classpkg2 = class2->package();
2852   } else {
2853     assert(class2->is_typeArray_klass(), "should be type array");
2854     classloader2 = NULL;
2855     classpkg2 = NULL;
2856   }
2857 
2858   // Same package is determined by comparing class loader
2859   // and package entries. Both must be the same. This rule
2860   // applies even to classes that are defined in the unnamed
2861   // package, they still must have the same class loader.
2862   if (oopDesc::equals(classloader1, classloader2) && (classpkg1 == classpkg2)) {
2863     return true;
2864   }
2865 
2866   return false;
2867 }
2868 
2869 // return true if this class and other_class are in the same package. Classloader
2870 // and classname information is enough to determine a class's package
2871 bool InstanceKlass::is_same_class_package(oop other_class_loader,
2872                                           const Symbol* other_class_name) const {
2873   if (!oopDesc::equals(class_loader(), other_class_loader)) {
2874     return false;
2875   }
2876   if (name()->fast_compare(other_class_name) == 0) {
2877      return true;
2878   }
2879 
2880   {
2881     ResourceMark rm;
2882 
2883     bool bad_class_name = false;
2884     const char* other_pkg =
2885       ClassLoader::package_from_name((const char*) other_class_name->as_C_string(), &bad_class_name);
2886     if (bad_class_name) {
2887       return false;
2888     }
2889     // Check that package_from_name() returns NULL, not "", if there is no package.
2890     assert(other_pkg == NULL || strlen(other_pkg) > 0, "package name is empty string");
2891 
2892     const Symbol* const this_package_name =
2893       this->package() != NULL ? this->package()->name() : NULL;
2894 
2895     if (this_package_name == NULL || other_pkg == NULL) {
2896       // One of the two doesn't have a package.  Only return true if the other
2897       // one also doesn't have a package.
2898       return (const char*)this_package_name == other_pkg;
2899     }
2900 
2901     // Check if package is identical
2902     return this_package_name->equals(other_pkg);
2903   }
2904 }
2905 
2906 // Returns true iff super_method can be overridden by a method in targetclassname
2907 // See JLS 3rd edition 8.4.6.1
2908 // Assumes name-signature match
2909 // "this" is InstanceKlass of super_method which must exist
2910 // note that the InstanceKlass of the method in the targetclassname has not always been created yet
2911 bool InstanceKlass::is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS) {
2912    // Private methods can not be overridden
2913    if (super_method->is_private()) {
2914      return false;
2915    }
2916    // If super method is accessible, then override
2917    if ((super_method->is_protected()) ||
2918        (super_method->is_public())) {
2919      return true;
2920    }
2921    // Package-private methods are not inherited outside of package
2922    assert(super_method->is_package_private(), "must be package private");
2923    return(is_same_class_package(targetclassloader(), targetclassname));
2924 }
2925 
2926 // Only boot and platform class loaders can define classes in "java/" packages.
2927 void InstanceKlass::check_prohibited_package(Symbol* class_name,
2928                                              ClassLoaderData* loader_data,
2929                                              TRAPS) {
2930   if (!loader_data->is_boot_class_loader_data() &&
2931       !loader_data->is_platform_class_loader_data() &&
2932       class_name != NULL) {
2933     ResourceMark rm(THREAD);
2934     char* name = class_name->as_C_string();
2935     if (strncmp(name, JAVAPKG, JAVAPKG_LEN) == 0 && name[JAVAPKG_LEN] == '/') {
2936       TempNewSymbol pkg_name = InstanceKlass::package_from_name(class_name, CHECK);
2937       assert(pkg_name != NULL, "Error in parsing package name starting with 'java/'");
2938       name = pkg_name->as_C_string();
2939       const char* class_loader_name = loader_data->loader_name_and_id();
2940       StringUtils::replace_no_expand(name, "/", ".");
2941       const char* msg_text1 = "Class loader (instance of): ";
2942       const char* msg_text2 = " tried to load prohibited package name: ";
2943       size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + strlen(name) + 1;
2944       char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len);
2945       jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, name);
2946       THROW_MSG(vmSymbols::java_lang_SecurityException(), message);
2947     }
2948   }
2949   return;
2950 }
2951 
2952 bool InstanceKlass::find_inner_classes_attr(int* ooff, int* noff, TRAPS) const {
2953   constantPoolHandle i_cp(THREAD, constants());
2954   for (InnerClassesIterator iter(this); !iter.done(); iter.next()) {
2955     int ioff = iter.inner_class_info_index();
2956     if (ioff != 0) {
2957       // Check to see if the name matches the class we're looking for
2958       // before attempting to find the class.
2959       if (i_cp->klass_name_at_matches(this, ioff)) {
2960         Klass* inner_klass = i_cp->klass_at(ioff, CHECK_false);
2961         if (this == inner_klass) {
2962           *ooff = iter.outer_class_info_index();
2963           *noff = iter.inner_name_index();
2964           return true;
2965         }
2966       }
2967     }
2968   }
2969   return false;
2970 }
2971 
2972 InstanceKlass* InstanceKlass::compute_enclosing_class(bool* inner_is_member, TRAPS) const {
2973   InstanceKlass* outer_klass = NULL;
2974   *inner_is_member = false;
2975   int ooff = 0, noff = 0;
2976   bool has_inner_classes_attr = find_inner_classes_attr(&ooff, &noff, THREAD);
2977   if (has_inner_classes_attr) {
2978     constantPoolHandle i_cp(THREAD, constants());
2979     if (ooff != 0) {
2980       Klass* ok = i_cp->klass_at(ooff, CHECK_NULL);
2981       outer_klass = InstanceKlass::cast(ok);
2982       *inner_is_member = true;
2983     }
2984     if (NULL == outer_klass) {
2985       // It may be unsafe anonymous; try for that.
2986       int encl_method_class_idx = enclosing_method_class_index();
2987       if (encl_method_class_idx != 0) {
2988         Klass* ok = i_cp->klass_at(encl_method_class_idx, CHECK_NULL);
2989         outer_klass = InstanceKlass::cast(ok);
2990         *inner_is_member = false;
2991       }
2992     }
2993   }
2994 
2995   // If no inner class attribute found for this class.
2996   if (NULL == outer_klass) return NULL;
2997 
2998   // Throws an exception if outer klass has not declared k as an inner klass
2999   // We need evidence that each klass knows about the other, or else
3000   // the system could allow a spoof of an inner class to gain access rights.
3001   Reflection::check_for_inner_class(outer_klass, this, *inner_is_member, CHECK_NULL);
3002   return outer_klass;
3003 }
3004 
3005 jint InstanceKlass::compute_modifier_flags(TRAPS) const {
3006   jint access = access_flags().as_int();
3007 
3008   // But check if it happens to be member class.
3009   InnerClassesIterator iter(this);
3010   for (; !iter.done(); iter.next()) {
3011     int ioff = iter.inner_class_info_index();
3012     // Inner class attribute can be zero, skip it.
3013     // Strange but true:  JVM spec. allows null inner class refs.
3014     if (ioff == 0) continue;
3015 
3016     // only look at classes that are already loaded
3017     // since we are looking for the flags for our self.
3018     Symbol* inner_name = constants()->klass_name_at(ioff);
3019     if (name() == inner_name) {
3020       // This is really a member class.
3021       access = iter.inner_access_flags();
3022       break;
3023     }
3024   }
3025   // Remember to strip ACC_SUPER bit
3026   return (access & (~JVM_ACC_SUPER)) & JVM_ACC_WRITTEN_FLAGS;
3027 }
3028 
3029 jint InstanceKlass::jvmti_class_status() const {
3030   jint result = 0;
3031 
3032   if (is_linked()) {
3033     result |= JVMTI_CLASS_STATUS_VERIFIED | JVMTI_CLASS_STATUS_PREPARED;
3034   }
3035 
3036   if (is_initialized()) {
3037     assert(is_linked(), "Class status is not consistent");
3038     result |= JVMTI_CLASS_STATUS_INITIALIZED;
3039   }
3040   if (is_in_error_state()) {
3041     result |= JVMTI_CLASS_STATUS_ERROR;
3042   }
3043   return result;
3044 }
3045 
3046 Method* InstanceKlass::method_at_itable(Klass* holder, int index, TRAPS) {
3047   itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable();
3048   int method_table_offset_in_words = ioe->offset()/wordSize;
3049   int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words())
3050                        / itableOffsetEntry::size();
3051 
3052   for (int cnt = 0 ; ; cnt ++, ioe ++) {
3053     // If the interface isn't implemented by the receiver class,
3054     // the VM should throw IncompatibleClassChangeError.
3055     if (cnt >= nof_interfaces) {
3056       ResourceMark rm(THREAD);
3057       stringStream ss;
3058       bool same_module = (module() == holder->module());
3059       ss.print("Receiver class %s does not implement "
3060                "the interface %s defining the method to be called "
3061                "(%s%s%s)",
3062                external_name(), holder->external_name(),
3063                (same_module) ? joint_in_module_of_loader(holder) : class_in_module_of_loader(),
3064                (same_module) ? "" : "; ",
3065                (same_module) ? "" : holder->class_in_module_of_loader());
3066       THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
3067     }
3068 
3069     Klass* ik = ioe->interface_klass();
3070     if (ik == holder) break;
3071   }
3072 
3073   itableMethodEntry* ime = ioe->first_method_entry(this);
3074   Method* m = ime[index].method();
3075   if (m == NULL) {
3076     THROW_NULL(vmSymbols::java_lang_AbstractMethodError());
3077   }
3078   return m;
3079 }
3080 
3081 
3082 #if INCLUDE_JVMTI
3083 // update default_methods for redefineclasses for methods that are
3084 // not yet in the vtable due to concurrent subclass define and superinterface
3085 // redefinition
3086 // Note: those in the vtable, should have been updated via adjust_method_entries
3087 void InstanceKlass::adjust_default_methods(bool* trace_name_printed) {
3088   // search the default_methods for uses of either obsolete or EMCP methods
3089   if (default_methods() != NULL) {
3090     for (int index = 0; index < default_methods()->length(); index ++) {
3091       Method* old_method = default_methods()->at(index);
3092       if (old_method == NULL || !old_method->is_old()) {
3093         continue; // skip uninteresting entries
3094       }
3095       assert(!old_method->is_deleted(), "default methods may not be deleted");
3096       Method* new_method = old_method->get_new_method();
3097       default_methods()->at_put(index, new_method);
3098 
3099       if (log_is_enabled(Info, redefine, class, update)) {
3100         ResourceMark rm;
3101         if (!(*trace_name_printed)) {
3102           log_info(redefine, class, update)
3103             ("adjust: klassname=%s default methods from name=%s",
3104              external_name(), old_method->method_holder()->external_name());
3105           *trace_name_printed = true;
3106         }
3107         log_debug(redefine, class, update, vtables)
3108           ("default method update: %s(%s) ",
3109            new_method->name()->as_C_string(), new_method->signature()->as_C_string());
3110       }
3111     }
3112   }
3113 }
3114 #endif // INCLUDE_JVMTI
3115 
3116 // On-stack replacement stuff
3117 void InstanceKlass::add_osr_nmethod(nmethod* n) {
3118 #ifndef PRODUCT
3119   if (TieredCompilation) {
3120       nmethod * prev = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), n->comp_level(), true);
3121       assert(prev == NULL || !prev->is_in_use(),
3122       "redundunt OSR recompilation detected. memory leak in CodeCache!");
3123   }
3124 #endif
3125   // only one compilation can be active
3126   {
3127     // This is a short non-blocking critical region, so the no safepoint check is ok.
3128     MutexLocker ml(OsrList_lock, Mutex::_no_safepoint_check_flag);
3129     assert(n->is_osr_method(), "wrong kind of nmethod");
3130     n->set_osr_link(osr_nmethods_head());
3131     set_osr_nmethods_head(n);
3132     // Raise the highest osr level if necessary
3133     if (TieredCompilation) {
3134       Method* m = n->method();
3135       m->set_highest_osr_comp_level(MAX2(m->highest_osr_comp_level(), n->comp_level()));
3136     }
3137   }
3138 
3139   // Get rid of the osr methods for the same bci that have lower levels.
3140   if (TieredCompilation) {
3141     for (int l = CompLevel_limited_profile; l < n->comp_level(); l++) {
3142       nmethod *inv = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), l, true);
3143       if (inv != NULL && inv->is_in_use()) {
3144         inv->make_not_entrant();
3145       }
3146     }
3147   }
3148 }
3149 
3150 // Remove osr nmethod from the list. Return true if found and removed.
3151 bool InstanceKlass::remove_osr_nmethod(nmethod* n) {
3152   // This is a short non-blocking critical region, so the no safepoint check is ok.
3153   MutexLocker ml(OsrList_lock, Mutex::_no_safepoint_check_flag);
3154   assert(n->is_osr_method(), "wrong kind of nmethod");
3155   nmethod* last = NULL;
3156   nmethod* cur  = osr_nmethods_head();
3157   int max_level = CompLevel_none;  // Find the max comp level excluding n
3158   Method* m = n->method();
3159   // Search for match
3160   bool found = false;
3161   while(cur != NULL && cur != n) {
3162     if (TieredCompilation && m == cur->method()) {
3163       // Find max level before n
3164       max_level = MAX2(max_level, cur->comp_level());
3165     }
3166     last = cur;
3167     cur = cur->osr_link();
3168   }
3169   nmethod* next = NULL;
3170   if (cur == n) {
3171     found = true;
3172     next = cur->osr_link();
3173     if (last == NULL) {
3174       // Remove first element
3175       set_osr_nmethods_head(next);
3176     } else {
3177       last->set_osr_link(next);
3178     }
3179   }
3180   n->set_osr_link(NULL);
3181   if (TieredCompilation) {
3182     cur = next;
3183     while (cur != NULL) {
3184       // Find max level after n
3185       if (m == cur->method()) {
3186         max_level = MAX2(max_level, cur->comp_level());
3187       }
3188       cur = cur->osr_link();
3189     }
3190     m->set_highest_osr_comp_level(max_level);
3191   }
3192   return found;
3193 }
3194 
3195 int InstanceKlass::mark_osr_nmethods(const Method* m) {
3196   // This is a short non-blocking critical region, so the no safepoint check is ok.
3197   MutexLocker ml(OsrList_lock, Mutex::_no_safepoint_check_flag);
3198   nmethod* osr = osr_nmethods_head();
3199   int found = 0;
3200   while (osr != NULL) {
3201     assert(osr->is_osr_method(), "wrong kind of nmethod found in chain");
3202     if (osr->method() == m) {
3203       osr->mark_for_deoptimization();
3204       found++;
3205     }
3206     osr = osr->osr_link();
3207   }
3208   return found;
3209 }
3210 
3211 nmethod* InstanceKlass::lookup_osr_nmethod(const Method* m, int bci, int comp_level, bool match_level) const {
3212   // This is a short non-blocking critical region, so the no safepoint check is ok.
3213   MutexLocker ml(OsrList_lock, Mutex::_no_safepoint_check_flag);
3214   nmethod* osr = osr_nmethods_head();
3215   nmethod* best = NULL;
3216   while (osr != NULL) {
3217     assert(osr->is_osr_method(), "wrong kind of nmethod found in chain");
3218     // There can be a time when a c1 osr method exists but we are waiting
3219     // for a c2 version. When c2 completes its osr nmethod we will trash
3220     // the c1 version and only be able to find the c2 version. However
3221     // while we overflow in the c1 code at back branches we don't want to
3222     // try and switch to the same code as we are already running
3223 
3224     if (osr->method() == m &&
3225         (bci == InvocationEntryBci || osr->osr_entry_bci() == bci)) {
3226       if (match_level) {
3227         if (osr->comp_level() == comp_level) {
3228           // Found a match - return it.
3229           return osr;
3230         }
3231       } else {
3232         if (best == NULL || (osr->comp_level() > best->comp_level())) {
3233           if (osr->comp_level() == CompLevel_highest_tier) {
3234             // Found the best possible - return it.
3235             return osr;
3236           }
3237           best = osr;
3238         }
3239       }
3240     }
3241     osr = osr->osr_link();
3242   }
3243 
3244   assert(match_level == false || best == NULL, "shouldn't pick up anything if match_level is set");
3245   if (best != NULL && best->comp_level() >= comp_level) {
3246     return best;
3247   }
3248   return NULL;
3249 }
3250 
3251 // -----------------------------------------------------------------------------------------------------
3252 // Printing
3253 
3254 #ifndef PRODUCT
3255 
3256 #define BULLET  " - "
3257 
3258 static const char* state_names[] = {
3259   "allocated", "loaded", "linked", "being_initialized", "fully_initialized", "initialization_error"
3260 };
3261 
3262 static void print_vtable(address self, intptr_t* start, int len, outputStream* st) {
3263   ResourceMark rm;
3264   int* forward_refs = NEW_RESOURCE_ARRAY(int, len);
3265   for (int i = 0; i < len; i++)  forward_refs[i] = 0;
3266   for (int i = 0; i < len; i++) {
3267     intptr_t e = start[i];
3268     st->print("%d : " INTPTR_FORMAT, i, e);
3269     if (forward_refs[i] != 0) {
3270       int from = forward_refs[i];
3271       int off = (int) start[from];
3272       st->print(" (offset %d <= [%d])", off, from);
3273     }
3274     if (MetaspaceObj::is_valid((Metadata*)e)) {
3275       st->print(" ");
3276       ((Metadata*)e)->print_value_on(st);
3277     } else if (self != NULL && e > 0 && e < 0x10000) {
3278       address location = self + e;
3279       int index = (int)((intptr_t*)location - start);
3280       st->print(" (offset %d => [%d])", (int)e, index);
3281       if (index >= 0 && index < len)
3282         forward_refs[index] = i;
3283     }
3284     st->cr();
3285   }
3286 }
3287 
3288 static void print_vtable(vtableEntry* start, int len, outputStream* st) {
3289   return print_vtable(NULL, reinterpret_cast<intptr_t*>(start), len, st);
3290 }
3291 
3292 template<typename T>
3293  static void print_array_on(outputStream* st, Array<T>* array) {
3294    if (array == NULL) { st->print_cr("NULL"); return; }
3295    array->print_value_on(st); st->cr();
3296    if (Verbose || WizardMode) {
3297      for (int i = 0; i < array->length(); i++) {
3298        st->print("%d : ", i); array->at(i)->print_value_on(st); st->cr();
3299      }
3300    }
3301  }
3302 
3303 static void print_array_on(outputStream* st, Array<int>* array) {
3304   if (array == NULL) { st->print_cr("NULL"); return; }
3305   array->print_value_on(st); st->cr();
3306   if (Verbose || WizardMode) {
3307     for (int i = 0; i < array->length(); i++) {
3308       st->print("%d : %d", i, array->at(i)); st->cr();
3309     }
3310   }
3311 }
3312 
3313 void InstanceKlass::print_on(outputStream* st) const {
3314   assert(is_klass(), "must be klass");
3315   Klass::print_on(st);
3316 
3317   st->print(BULLET"instance size:     %d", size_helper());                        st->cr();
3318   st->print(BULLET"klass size:        %d", size());                               st->cr();
3319   st->print(BULLET"access:            "); access_flags().print_on(st);            st->cr();
3320   st->print(BULLET"misc flags:        0x%x", _misc_flags);                        st->cr();
3321   st->print(BULLET"state:             "); st->print_cr("%s", state_names[_init_state]);
3322   st->print(BULLET"name:              "); name()->print_value_on(st);             st->cr();
3323   st->print(BULLET"super:             "); Metadata::print_value_on_maybe_null(st, super()); st->cr();
3324   st->print(BULLET"sub:               ");
3325   Klass* sub = subklass();
3326   int n;
3327   for (n = 0; sub != NULL; n++, sub = sub->next_sibling()) {
3328     if (n < MaxSubklassPrintSize) {
3329       sub->print_value_on(st);
3330       st->print("   ");
3331     }
3332   }
3333   if (n >= MaxSubklassPrintSize) st->print("(" INTX_FORMAT " more klasses...)", n - MaxSubklassPrintSize);
3334   st->cr();
3335 
3336   if (is_interface()) {
3337     st->print_cr(BULLET"nof implementors:  %d", nof_implementors());
3338     if (nof_implementors() == 1) {
3339       st->print_cr(BULLET"implementor:    ");
3340       st->print("   ");
3341       implementor()->print_value_on(st);
3342       st->cr();
3343     }
3344   }
3345 
3346   st->print(BULLET"arrays:            "); Metadata::print_value_on_maybe_null(st, array_klasses()); st->cr();
3347   st->print(BULLET"methods:           "); print_array_on(st, methods());
3348   st->print(BULLET"method ordering:   "); print_array_on(st, method_ordering());
3349   st->print(BULLET"default_methods:   "); print_array_on(st, default_methods());
3350   if (default_vtable_indices() != NULL) {
3351     st->print(BULLET"default vtable indices:   "); print_array_on(st, default_vtable_indices());
3352   }
3353   st->print(BULLET"local interfaces:  "); print_array_on(st, local_interfaces());
3354   st->print(BULLET"trans. interfaces: "); print_array_on(st, transitive_interfaces());
3355   st->print(BULLET"constants:         "); constants()->print_value_on(st);         st->cr();
3356   if (class_loader_data() != NULL) {
3357     st->print(BULLET"class loader data:  ");
3358     class_loader_data()->print_value_on(st);
3359     st->cr();
3360   }
3361   st->print(BULLET"unsafe anonymous host class:        "); Metadata::print_value_on_maybe_null(st, unsafe_anonymous_host()); st->cr();
3362   if (source_file_name() != NULL) {
3363     st->print(BULLET"source file:       ");
3364     source_file_name()->print_value_on(st);
3365     st->cr();
3366   }
3367   if (source_debug_extension() != NULL) {
3368     st->print(BULLET"source debug extension:       ");
3369     st->print("%s", source_debug_extension());
3370     st->cr();
3371   }
3372   st->print(BULLET"class annotations:       "); class_annotations()->print_value_on(st); st->cr();
3373   st->print(BULLET"class type annotations:  "); class_type_annotations()->print_value_on(st); st->cr();
3374   st->print(BULLET"field annotations:       "); fields_annotations()->print_value_on(st); st->cr();
3375   st->print(BULLET"field type annotations:  "); fields_type_annotations()->print_value_on(st); st->cr();
3376   {
3377     bool have_pv = false;
3378     // previous versions are linked together through the InstanceKlass
3379     for (InstanceKlass* pv_node = previous_versions();
3380          pv_node != NULL;
3381          pv_node = pv_node->previous_versions()) {
3382       if (!have_pv)
3383         st->print(BULLET"previous version:  ");
3384       have_pv = true;
3385       pv_node->constants()->print_value_on(st);
3386     }
3387     if (have_pv) st->cr();
3388   }
3389 
3390   if (generic_signature() != NULL) {
3391     st->print(BULLET"generic signature: ");
3392     generic_signature()->print_value_on(st);
3393     st->cr();
3394   }
3395   st->print(BULLET"inner classes:     "); inner_classes()->print_value_on(st);     st->cr();
3396   st->print(BULLET"nest members:     "); nest_members()->print_value_on(st);     st->cr();
3397   if (java_mirror() != NULL) {
3398     st->print(BULLET"java mirror:       ");
3399     java_mirror()->print_value_on(st);
3400     st->cr();
3401   } else {
3402     st->print_cr(BULLET"java mirror:       NULL");
3403   }
3404   st->print(BULLET"vtable length      %d  (start addr: " INTPTR_FORMAT ")", vtable_length(), p2i(start_of_vtable())); st->cr();
3405   if (vtable_length() > 0 && (Verbose || WizardMode))  print_vtable(start_of_vtable(), vtable_length(), st);
3406   st->print(BULLET"itable length      %d (start addr: " INTPTR_FORMAT ")", itable_length(), p2i(start_of_itable())); st->cr();
3407   if (itable_length() > 0 && (Verbose || WizardMode))  print_vtable(NULL, start_of_itable(), itable_length(), st);
3408   st->print_cr(BULLET"---- static fields (%d words):", static_field_size());
3409   FieldPrinter print_static_field(st);
3410   ((InstanceKlass*)this)->do_local_static_fields(&print_static_field);
3411   st->print_cr(BULLET"---- non-static fields (%d words):", nonstatic_field_size());
3412   FieldPrinter print_nonstatic_field(st);
3413   InstanceKlass* ik = const_cast<InstanceKlass*>(this);
3414   ik->do_nonstatic_fields(&print_nonstatic_field);
3415 
3416   st->print(BULLET"non-static oop maps: ");
3417   OopMapBlock* map     = start_of_nonstatic_oop_maps();
3418   OopMapBlock* end_map = map + nonstatic_oop_map_count();
3419   while (map < end_map) {
3420     st->print("%d-%d ", map->offset(), map->offset() + heapOopSize*(map->count() - 1));
3421     map++;
3422   }
3423   st->cr();
3424 }
3425 
3426 #endif //PRODUCT
3427 
3428 void InstanceKlass::print_value_on(outputStream* st) const {
3429   assert(is_klass(), "must be klass");
3430   if (Verbose || WizardMode)  access_flags().print_on(st);
3431   name()->print_value_on(st);
3432 }
3433 
3434 #ifndef PRODUCT
3435 
3436 void FieldPrinter::do_field(fieldDescriptor* fd) {
3437   _st->print(BULLET);
3438    if (_obj == NULL) {
3439      fd->print_on(_st);
3440      _st->cr();
3441    } else {
3442      fd->print_on_for(_st, _obj);
3443      _st->cr();
3444    }
3445 }
3446 
3447 
3448 void InstanceKlass::oop_print_on(oop obj, outputStream* st) {
3449   Klass::oop_print_on(obj, st);
3450 
3451   if (this == SystemDictionary::String_klass()) {
3452     typeArrayOop value  = java_lang_String::value(obj);
3453     juint        length = java_lang_String::length(obj);
3454     if (value != NULL &&
3455         value->is_typeArray() &&
3456         length <= (juint) value->length()) {
3457       st->print(BULLET"string: ");
3458       java_lang_String::print(obj, st);
3459       st->cr();
3460       if (!WizardMode)  return;  // that is enough
3461     }
3462   }
3463 
3464   st->print_cr(BULLET"---- fields (total size %d words):", oop_size(obj));
3465   FieldPrinter print_field(st, obj);
3466   do_nonstatic_fields(&print_field);
3467 
3468   if (this == SystemDictionary::Class_klass()) {
3469     st->print(BULLET"signature: ");
3470     java_lang_Class::print_signature(obj, st);
3471     st->cr();
3472     Klass* mirrored_klass = java_lang_Class::as_Klass(obj);
3473     st->print(BULLET"fake entry for mirror: ");
3474     Metadata::print_value_on_maybe_null(st, mirrored_klass);
3475     st->cr();
3476     Klass* array_klass = java_lang_Class::array_klass_acquire(obj);
3477     st->print(BULLET"fake entry for array: ");
3478     Metadata::print_value_on_maybe_null(st, array_klass);
3479     st->cr();
3480     st->print_cr(BULLET"fake entry for oop_size: %d", java_lang_Class::oop_size(obj));
3481     st->print_cr(BULLET"fake entry for static_oop_field_count: %d", java_lang_Class::static_oop_field_count(obj));
3482     Klass* real_klass = java_lang_Class::as_Klass(obj);
3483     if (real_klass != NULL && real_klass->is_instance_klass()) {
3484       InstanceKlass::cast(real_klass)->do_local_static_fields(&print_field);
3485     }
3486   } else if (this == SystemDictionary::MethodType_klass()) {
3487     st->print(BULLET"signature: ");
3488     java_lang_invoke_MethodType::print_signature(obj, st);
3489     st->cr();
3490   }
3491 }
3492 
3493 bool InstanceKlass::verify_itable_index(int i) {
3494   int method_count = klassItable::method_count_for_interface(this);
3495   assert(i >= 0 && i < method_count, "index out of bounds");
3496   return true;
3497 }
3498 
3499 #endif //PRODUCT
3500 
3501 void InstanceKlass::oop_print_value_on(oop obj, outputStream* st) {
3502   st->print("a ");
3503   name()->print_value_on(st);
3504   obj->print_address_on(st);
3505   if (this == SystemDictionary::String_klass()
3506       && java_lang_String::value(obj) != NULL) {
3507     ResourceMark rm;
3508     int len = java_lang_String::length(obj);
3509     int plen = (len < 24 ? len : 12);
3510     char* str = java_lang_String::as_utf8_string(obj, 0, plen);
3511     st->print(" = \"%s\"", str);
3512     if (len > plen)
3513       st->print("...[%d]", len);
3514   } else if (this == SystemDictionary::Class_klass()) {
3515     Klass* k = java_lang_Class::as_Klass(obj);
3516     st->print(" = ");
3517     if (k != NULL) {
3518       k->print_value_on(st);
3519     } else {
3520       const char* tname = type2name(java_lang_Class::primitive_type(obj));
3521       st->print("%s", tname ? tname : "type?");
3522     }
3523   } else if (this == SystemDictionary::MethodType_klass()) {
3524     st->print(" = ");
3525     java_lang_invoke_MethodType::print_signature(obj, st);
3526   } else if (java_lang_boxing_object::is_instance(obj)) {
3527     st->print(" = ");
3528     java_lang_boxing_object::print(obj, st);
3529   } else if (this == SystemDictionary::LambdaForm_klass()) {
3530     oop vmentry = java_lang_invoke_LambdaForm::vmentry(obj);
3531     if (vmentry != NULL) {
3532       st->print(" => ");
3533       vmentry->print_value_on(st);
3534     }
3535   } else if (this == SystemDictionary::MemberName_klass()) {
3536     Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(obj);
3537     if (vmtarget != NULL) {
3538       st->print(" = ");
3539       vmtarget->print_value_on(st);
3540     } else {
3541       java_lang_invoke_MemberName::clazz(obj)->print_value_on(st);
3542       st->print(".");
3543       java_lang_invoke_MemberName::name(obj)->print_value_on(st);
3544     }
3545   }
3546 }
3547 
3548 const char* InstanceKlass::internal_name() const {
3549   return external_name();
3550 }
3551 
3552 void InstanceKlass::print_class_load_logging(ClassLoaderData* loader_data,
3553                                              const char* module_name,
3554                                              const ClassFileStream* cfs) const {
3555   if (!log_is_enabled(Info, class, load)) {
3556     return;
3557   }
3558 
3559   ResourceMark rm;
3560   LogMessage(class, load) msg;
3561   stringStream info_stream;
3562 
3563   // Name and class hierarchy info
3564   info_stream.print("%s", external_name());
3565 
3566   // Source
3567   if (cfs != NULL) {
3568     if (cfs->source() != NULL) {
3569       if (module_name != NULL) {
3570         // When the boot loader created the stream, it didn't know the module name
3571         // yet. Let's format it now.
3572         if (cfs->from_boot_loader_modules_image()) {
3573           info_stream.print(" source: jrt:/%s", module_name);
3574         } else {
3575           info_stream.print(" source: %s", cfs->source());
3576         }
3577       } else {
3578         info_stream.print(" source: %s", cfs->source());
3579       }
3580     } else if (loader_data == ClassLoaderData::the_null_class_loader_data()) {
3581       Thread* THREAD = Thread::current();
3582       Klass* caller =
3583             THREAD->is_Java_thread()
3584                 ? ((JavaThread*)THREAD)->security_get_caller_class(1)
3585                 : NULL;
3586       // caller can be NULL, for example, during a JVMTI VM_Init hook
3587       if (caller != NULL) {
3588         info_stream.print(" source: instance of %s", caller->external_name());
3589       } else {
3590         // source is unknown
3591       }
3592     } else {
3593       oop class_loader = loader_data->class_loader();
3594       info_stream.print(" source: %s", class_loader->klass()->external_name());
3595     }
3596   } else {
3597     assert(this->is_shared(), "must be");
3598     if (MetaspaceShared::is_shared_dynamic((void*)this)) {
3599       info_stream.print(" source: shared objects file (top)");
3600     } else {
3601       info_stream.print(" source: shared objects file");
3602     }
3603   }
3604 
3605   msg.info("%s", info_stream.as_string());
3606 
3607   if (log_is_enabled(Debug, class, load)) {
3608     stringStream debug_stream;
3609 
3610     // Class hierarchy info
3611     debug_stream.print(" klass: " INTPTR_FORMAT " super: " INTPTR_FORMAT,
3612                        p2i(this),  p2i(superklass()));
3613 
3614     // Interfaces
3615     if (local_interfaces() != NULL && local_interfaces()->length() > 0) {
3616       debug_stream.print(" interfaces:");
3617       int length = local_interfaces()->length();
3618       for (int i = 0; i < length; i++) {
3619         debug_stream.print(" " INTPTR_FORMAT,
3620                            p2i(InstanceKlass::cast(local_interfaces()->at(i))));
3621       }
3622     }
3623 
3624     // Class loader
3625     debug_stream.print(" loader: [");
3626     loader_data->print_value_on(&debug_stream);
3627     debug_stream.print("]");
3628 
3629     // Classfile checksum
3630     if (cfs) {
3631       debug_stream.print(" bytes: %d checksum: %08x",
3632                          cfs->length(),
3633                          ClassLoader::crc32(0, (const char*)cfs->buffer(),
3634                          cfs->length()));
3635     }
3636 
3637     msg.debug("%s", debug_stream.as_string());
3638   }
3639 }
3640 
3641 #if INCLUDE_SERVICES
3642 // Size Statistics
3643 void InstanceKlass::collect_statistics(KlassSizeStats *sz) const {
3644   Klass::collect_statistics(sz);
3645 
3646   sz->_inst_size  = wordSize * size_helper();
3647   sz->_vtab_bytes = wordSize * vtable_length();
3648   sz->_itab_bytes = wordSize * itable_length();
3649   sz->_nonstatic_oopmap_bytes = wordSize * nonstatic_oop_map_size();
3650 
3651   int n = 0;
3652   n += (sz->_methods_array_bytes         = sz->count_array(methods()));
3653   n += (sz->_method_ordering_bytes       = sz->count_array(method_ordering()));
3654   n += (sz->_local_interfaces_bytes      = sz->count_array(local_interfaces()));
3655   n += (sz->_transitive_interfaces_bytes = sz->count_array(transitive_interfaces()));
3656   n += (sz->_fields_bytes                = sz->count_array(fields()));
3657   n += (sz->_inner_classes_bytes         = sz->count_array(inner_classes()));
3658   n += (sz->_nest_members_bytes          = sz->count_array(nest_members()));
3659   sz->_ro_bytes += n;
3660 
3661   const ConstantPool* cp = constants();
3662   if (cp) {
3663     cp->collect_statistics(sz);
3664   }
3665 
3666   const Annotations* anno = annotations();
3667   if (anno) {
3668     anno->collect_statistics(sz);
3669   }
3670 
3671   const Array<Method*>* methods_array = methods();
3672   if (methods()) {
3673     for (int i = 0; i < methods_array->length(); i++) {
3674       Method* method = methods_array->at(i);
3675       if (method) {
3676         sz->_method_count ++;
3677         method->collect_statistics(sz);
3678       }
3679     }
3680   }
3681 }
3682 #endif // INCLUDE_SERVICES
3683 
3684 // Verification
3685 
3686 class VerifyFieldClosure: public BasicOopIterateClosure {
3687  protected:
3688   template <class T> void do_oop_work(T* p) {
3689     oop obj = RawAccess<>::oop_load(p);
3690     if (!oopDesc::is_oop_or_null(obj)) {
3691       tty->print_cr("Failed: " PTR_FORMAT " -> " PTR_FORMAT, p2i(p), p2i(obj));
3692       Universe::print_on(tty);
3693       guarantee(false, "boom");
3694     }
3695   }
3696  public:
3697   virtual void do_oop(oop* p)       { VerifyFieldClosure::do_oop_work(p); }
3698   virtual void do_oop(narrowOop* p) { VerifyFieldClosure::do_oop_work(p); }
3699 };
3700 
3701 void InstanceKlass::verify_on(outputStream* st) {
3702 #ifndef PRODUCT
3703   // Avoid redundant verifies, this really should be in product.
3704   if (_verify_count == Universe::verify_count()) return;
3705   _verify_count = Universe::verify_count();
3706 #endif
3707 
3708   // Verify Klass
3709   Klass::verify_on(st);
3710 
3711   // Verify that klass is present in ClassLoaderData
3712   guarantee(class_loader_data()->contains_klass(this),
3713             "this class isn't found in class loader data");
3714 
3715   // Verify vtables
3716   if (is_linked()) {
3717     // $$$ This used to be done only for m/s collections.  Doing it
3718     // always seemed a valid generalization.  (DLD -- 6/00)
3719     vtable().verify(st);
3720   }
3721 
3722   // Verify first subklass
3723   if (subklass() != NULL) {
3724     guarantee(subklass()->is_klass(), "should be klass");
3725   }
3726 
3727   // Verify siblings
3728   Klass* super = this->super();
3729   Klass* sib = next_sibling();
3730   if (sib != NULL) {
3731     if (sib == this) {
3732       fatal("subclass points to itself " PTR_FORMAT, p2i(sib));
3733     }
3734 
3735     guarantee(sib->is_klass(), "should be klass");
3736     guarantee(sib->super() == super, "siblings should have same superklass");
3737   }
3738 
3739   // Verify local interfaces
3740   if (local_interfaces()) {
3741     Array<InstanceKlass*>* local_interfaces = this->local_interfaces();
3742     for (int j = 0; j < local_interfaces->length(); j++) {
3743       InstanceKlass* e = local_interfaces->at(j);
3744       guarantee(e->is_klass() && e->is_interface(), "invalid local interface");
3745     }
3746   }
3747 
3748   // Verify transitive interfaces
3749   if (transitive_interfaces() != NULL) {
3750     Array<InstanceKlass*>* transitive_interfaces = this->transitive_interfaces();
3751     for (int j = 0; j < transitive_interfaces->length(); j++) {
3752       InstanceKlass* e = transitive_interfaces->at(j);
3753       guarantee(e->is_klass() && e->is_interface(), "invalid transitive interface");
3754     }
3755   }
3756 
3757   // Verify methods
3758   if (methods() != NULL) {
3759     Array<Method*>* methods = this->methods();
3760     for (int j = 0; j < methods->length(); j++) {
3761       guarantee(methods->at(j)->is_method(), "non-method in methods array");
3762     }
3763     for (int j = 0; j < methods->length() - 1; j++) {
3764       Method* m1 = methods->at(j);
3765       Method* m2 = methods->at(j + 1);
3766       guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
3767     }
3768   }
3769 
3770   // Verify method ordering
3771   if (method_ordering() != NULL) {
3772     Array<int>* method_ordering = this->method_ordering();
3773     int length = method_ordering->length();
3774     if (JvmtiExport::can_maintain_original_method_order() ||
3775         ((UseSharedSpaces || DumpSharedSpaces) && length != 0)) {
3776       guarantee(length == methods()->length(), "invalid method ordering length");
3777       jlong sum = 0;
3778       for (int j = 0; j < length; j++) {
3779         int original_index = method_ordering->at(j);
3780         guarantee(original_index >= 0, "invalid method ordering index");
3781         guarantee(original_index < length, "invalid method ordering index");
3782         sum += original_index;
3783       }
3784       // Verify sum of indices 0,1,...,length-1
3785       guarantee(sum == ((jlong)length*(length-1))/2, "invalid method ordering sum");
3786     } else {
3787       guarantee(length == 0, "invalid method ordering length");
3788     }
3789   }
3790 
3791   // Verify default methods
3792   if (default_methods() != NULL) {
3793     Array<Method*>* methods = this->default_methods();
3794     for (int j = 0; j < methods->length(); j++) {
3795       guarantee(methods->at(j)->is_method(), "non-method in methods array");
3796     }
3797     for (int j = 0; j < methods->length() - 1; j++) {
3798       Method* m1 = methods->at(j);
3799       Method* m2 = methods->at(j + 1);
3800       guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
3801     }
3802   }
3803 
3804   // Verify JNI static field identifiers
3805   if (jni_ids() != NULL) {
3806     jni_ids()->verify(this);
3807   }
3808 
3809   // Verify other fields
3810   if (array_klasses() != NULL) {
3811     guarantee(array_klasses()->is_klass(), "should be klass");
3812   }
3813   if (constants() != NULL) {
3814     guarantee(constants()->is_constantPool(), "should be constant pool");
3815   }
3816   const Klass* anonymous_host = unsafe_anonymous_host();
3817   if (anonymous_host != NULL) {
3818     guarantee(anonymous_host->is_klass(), "should be klass");
3819   }
3820 }
3821 
3822 void InstanceKlass::oop_verify_on(oop obj, outputStream* st) {
3823   Klass::oop_verify_on(obj, st);
3824   VerifyFieldClosure blk;
3825   obj->oop_iterate(&blk);
3826 }
3827 
3828 
3829 // JNIid class for jfieldIDs only
3830 // Note to reviewers:
3831 // These JNI functions are just moved over to column 1 and not changed
3832 // in the compressed oops workspace.
3833 JNIid::JNIid(Klass* holder, int offset, JNIid* next) {
3834   _holder = holder;
3835   _offset = offset;
3836   _next = next;
3837   debug_only(_is_static_field_id = false;)
3838 }
3839 
3840 
3841 JNIid* JNIid::find(int offset) {
3842   JNIid* current = this;
3843   while (current != NULL) {
3844     if (current->offset() == offset) return current;
3845     current = current->next();
3846   }
3847   return NULL;
3848 }
3849 
3850 void JNIid::deallocate(JNIid* current) {
3851   while (current != NULL) {
3852     JNIid* next = current->next();
3853     delete current;
3854     current = next;
3855   }
3856 }
3857 
3858 
3859 void JNIid::verify(Klass* holder) {
3860   int first_field_offset  = InstanceMirrorKlass::offset_of_static_fields();
3861   int end_field_offset;
3862   end_field_offset = first_field_offset + (InstanceKlass::cast(holder)->static_field_size() * wordSize);
3863 
3864   JNIid* current = this;
3865   while (current != NULL) {
3866     guarantee(current->holder() == holder, "Invalid klass in JNIid");
3867 #ifdef ASSERT
3868     int o = current->offset();
3869     if (current->is_static_field_id()) {
3870       guarantee(o >= first_field_offset  && o < end_field_offset,  "Invalid static field offset in JNIid");
3871     }
3872 #endif
3873     current = current->next();
3874   }
3875 }
3876 
3877 void InstanceKlass::set_init_state(ClassState state) {
3878 #ifdef ASSERT
3879   bool good_state = is_shared() ? (_init_state <= state)
3880                                                : (_init_state < state);
3881   assert(good_state || state == allocated, "illegal state transition");
3882 #endif
3883   assert(_init_thread == NULL, "should be cleared before state change");
3884   _init_state = (u1)state;
3885 }
3886 
3887 #if INCLUDE_JVMTI
3888 
3889 // RedefineClasses() support for previous versions
3890 
3891 // Globally, there is at least one previous version of a class to walk
3892 // during class unloading, which is saved because old methods in the class
3893 // are still running.   Otherwise the previous version list is cleaned up.
3894 bool InstanceKlass::_has_previous_versions = false;
3895 
3896 // Returns true if there are previous versions of a class for class
3897 // unloading only. Also resets the flag to false. purge_previous_version
3898 // will set the flag to true if there are any left, i.e., if there's any
3899 // work to do for next time. This is to avoid the expensive code cache
3900 // walk in CLDG::clean_deallocate_lists().
3901 bool InstanceKlass::has_previous_versions_and_reset() {
3902   bool ret = _has_previous_versions;
3903   log_trace(redefine, class, iklass, purge)("Class unloading: has_previous_versions = %s",
3904      ret ? "true" : "false");
3905   _has_previous_versions = false;
3906   return ret;
3907 }
3908 
3909 // Purge previous versions before adding new previous versions of the class and
3910 // during class unloading.
3911 void InstanceKlass::purge_previous_version_list() {
3912   assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
3913   assert(has_been_redefined(), "Should only be called for main class");
3914 
3915   // Quick exit.
3916   if (previous_versions() == NULL) {
3917     return;
3918   }
3919 
3920   // This klass has previous versions so see what we can cleanup
3921   // while it is safe to do so.
3922 
3923   int deleted_count = 0;    // leave debugging breadcrumbs
3924   int live_count = 0;
3925   ClassLoaderData* loader_data = class_loader_data();
3926   assert(loader_data != NULL, "should never be null");
3927 
3928   ResourceMark rm;
3929   log_trace(redefine, class, iklass, purge)("%s: previous versions", external_name());
3930 
3931   // previous versions are linked together through the InstanceKlass
3932   InstanceKlass* pv_node = previous_versions();
3933   InstanceKlass* last = this;
3934   int version = 0;
3935 
3936   // check the previous versions list
3937   for (; pv_node != NULL; ) {
3938 
3939     ConstantPool* pvcp = pv_node->constants();
3940     assert(pvcp != NULL, "cp ref was unexpectedly cleared");
3941 
3942     if (!pvcp->on_stack()) {
3943       // If the constant pool isn't on stack, none of the methods
3944       // are executing.  Unlink this previous_version.
3945       // The previous version InstanceKlass is on the ClassLoaderData deallocate list
3946       // so will be deallocated during the next phase of class unloading.
3947       log_trace(redefine, class, iklass, purge)
3948         ("previous version " INTPTR_FORMAT " is dead.", p2i(pv_node));
3949       // For debugging purposes.
3950       pv_node->set_is_scratch_class();
3951       // Unlink from previous version list.
3952       assert(pv_node->class_loader_data() == loader_data, "wrong loader_data");
3953       InstanceKlass* next = pv_node->previous_versions();
3954       pv_node->link_previous_versions(NULL);   // point next to NULL
3955       last->link_previous_versions(next);
3956       // Add to the deallocate list after unlinking
3957       loader_data->add_to_deallocate_list(pv_node);
3958       pv_node = next;
3959       deleted_count++;
3960       version++;
3961       continue;
3962     } else {
3963       log_trace(redefine, class, iklass, purge)("previous version " INTPTR_FORMAT " is alive", p2i(pv_node));
3964       assert(pvcp->pool_holder() != NULL, "Constant pool with no holder");
3965       guarantee (!loader_data->is_unloading(), "unloaded classes can't be on the stack");
3966       live_count++;
3967       // found a previous version for next time we do class unloading
3968       _has_previous_versions = true;
3969     }
3970 
3971     // At least one method is live in this previous version.
3972     // Reset dead EMCP methods not to get breakpoints.
3973     // All methods are deallocated when all of the methods for this class are no
3974     // longer running.
3975     Array<Method*>* method_refs = pv_node->methods();
3976     if (method_refs != NULL) {
3977       log_trace(redefine, class, iklass, purge)("previous methods length=%d", method_refs->length());
3978       for (int j = 0; j < method_refs->length(); j++) {
3979         Method* method = method_refs->at(j);
3980 
3981         if (!method->on_stack()) {
3982           // no breakpoints for non-running methods
3983           if (method->is_running_emcp()) {
3984             method->set_running_emcp(false);
3985           }
3986         } else {
3987           assert (method->is_obsolete() || method->is_running_emcp(),
3988                   "emcp method cannot run after emcp bit is cleared");
3989           log_trace(redefine, class, iklass, purge)
3990             ("purge: %s(%s): prev method @%d in version @%d is alive",
3991              method->name()->as_C_string(), method->signature()->as_C_string(), j, version);
3992         }
3993       }
3994     }
3995     // next previous version
3996     last = pv_node;
3997     pv_node = pv_node->previous_versions();
3998     version++;
3999   }
4000   log_trace(redefine, class, iklass, purge)
4001     ("previous version stats: live=%d, deleted=%d", live_count, deleted_count);
4002 }
4003 
4004 void InstanceKlass::mark_newly_obsolete_methods(Array<Method*>* old_methods,
4005                                                 int emcp_method_count) {
4006   int obsolete_method_count = old_methods->length() - emcp_method_count;
4007 
4008   if (emcp_method_count != 0 && obsolete_method_count != 0 &&
4009       _previous_versions != NULL) {
4010     // We have a mix of obsolete and EMCP methods so we have to
4011     // clear out any matching EMCP method entries the hard way.
4012     int local_count = 0;
4013     for (int i = 0; i < old_methods->length(); i++) {
4014       Method* old_method = old_methods->at(i);
4015       if (old_method->is_obsolete()) {
4016         // only obsolete methods are interesting
4017         Symbol* m_name = old_method->name();
4018         Symbol* m_signature = old_method->signature();
4019 
4020         // previous versions are linked together through the InstanceKlass
4021         int j = 0;
4022         for (InstanceKlass* prev_version = _previous_versions;
4023              prev_version != NULL;
4024              prev_version = prev_version->previous_versions(), j++) {
4025 
4026           Array<Method*>* method_refs = prev_version->methods();
4027           for (int k = 0; k < method_refs->length(); k++) {
4028             Method* method = method_refs->at(k);
4029 
4030             if (!method->is_obsolete() &&
4031                 method->name() == m_name &&
4032                 method->signature() == m_signature) {
4033               // The current RedefineClasses() call has made all EMCP
4034               // versions of this method obsolete so mark it as obsolete
4035               log_trace(redefine, class, iklass, add)
4036                 ("%s(%s): flush obsolete method @%d in version @%d",
4037                  m_name->as_C_string(), m_signature->as_C_string(), k, j);
4038 
4039               method->set_is_obsolete();
4040               break;
4041             }
4042           }
4043 
4044           // The previous loop may not find a matching EMCP method, but
4045           // that doesn't mean that we can optimize and not go any
4046           // further back in the PreviousVersion generations. The EMCP
4047           // method for this generation could have already been made obsolete,
4048           // but there still may be an older EMCP method that has not
4049           // been made obsolete.
4050         }
4051 
4052         if (++local_count >= obsolete_method_count) {
4053           // no more obsolete methods so bail out now
4054           break;
4055         }
4056       }
4057     }
4058   }
4059 }
4060 
4061 // Save the scratch_class as the previous version if any of the methods are running.
4062 // The previous_versions are used to set breakpoints in EMCP methods and they are
4063 // also used to clean MethodData links to redefined methods that are no longer running.
4064 void InstanceKlass::add_previous_version(InstanceKlass* scratch_class,
4065                                          int emcp_method_count) {
4066   assert(Thread::current()->is_VM_thread(),
4067          "only VMThread can add previous versions");
4068 
4069   ResourceMark rm;
4070   log_trace(redefine, class, iklass, add)
4071     ("adding previous version ref for %s, EMCP_cnt=%d", scratch_class->external_name(), emcp_method_count);
4072 
4073   // Clean out old previous versions for this class
4074   purge_previous_version_list();
4075 
4076   // Mark newly obsolete methods in remaining previous versions.  An EMCP method from
4077   // a previous redefinition may be made obsolete by this redefinition.
4078   Array<Method*>* old_methods = scratch_class->methods();
4079   mark_newly_obsolete_methods(old_methods, emcp_method_count);
4080 
4081   // If the constant pool for this previous version of the class
4082   // is not marked as being on the stack, then none of the methods
4083   // in this previous version of the class are on the stack so
4084   // we don't need to add this as a previous version.
4085   ConstantPool* cp_ref = scratch_class->constants();
4086   if (!cp_ref->on_stack()) {
4087     log_trace(redefine, class, iklass, add)("scratch class not added; no methods are running");
4088     // For debugging purposes.
4089     scratch_class->set_is_scratch_class();
4090     scratch_class->class_loader_data()->add_to_deallocate_list(scratch_class);
4091     return;
4092   }
4093 
4094   if (emcp_method_count != 0) {
4095     // At least one method is still running, check for EMCP methods
4096     for (int i = 0; i < old_methods->length(); i++) {
4097       Method* old_method = old_methods->at(i);
4098       if (!old_method->is_obsolete() && old_method->on_stack()) {
4099         // if EMCP method (not obsolete) is on the stack, mark as EMCP so that
4100         // we can add breakpoints for it.
4101 
4102         // We set the method->on_stack bit during safepoints for class redefinition
4103         // and use this bit to set the is_running_emcp bit.
4104         // After the safepoint, the on_stack bit is cleared and the running emcp
4105         // method may exit.   If so, we would set a breakpoint in a method that
4106         // is never reached, but this won't be noticeable to the programmer.
4107         old_method->set_running_emcp(true);
4108         log_trace(redefine, class, iklass, add)
4109           ("EMCP method %s is on_stack " INTPTR_FORMAT, old_method->name_and_sig_as_C_string(), p2i(old_method));
4110       } else if (!old_method->is_obsolete()) {
4111         log_trace(redefine, class, iklass, add)
4112           ("EMCP method %s is NOT on_stack " INTPTR_FORMAT, old_method->name_and_sig_as_C_string(), p2i(old_method));
4113       }
4114     }
4115   }
4116 
4117   // Add previous version if any methods are still running.
4118   // Set has_previous_version flag for processing during class unloading.
4119   _has_previous_versions = true;
4120   log_trace(redefine, class, iklass, add) ("scratch class added; one of its methods is on_stack.");
4121   assert(scratch_class->previous_versions() == NULL, "shouldn't have a previous version");
4122   scratch_class->link_previous_versions(previous_versions());
4123   link_previous_versions(scratch_class);
4124 } // end add_previous_version()
4125 
4126 #endif // INCLUDE_JVMTI
4127 
4128 Method* InstanceKlass::method_with_idnum(int idnum) {
4129   Method* m = NULL;
4130   if (idnum < methods()->length()) {
4131     m = methods()->at(idnum);
4132   }
4133   if (m == NULL || m->method_idnum() != idnum) {
4134     for (int index = 0; index < methods()->length(); ++index) {
4135       m = methods()->at(index);
4136       if (m->method_idnum() == idnum) {
4137         return m;
4138       }
4139     }
4140     // None found, return null for the caller to handle.
4141     return NULL;
4142   }
4143   return m;
4144 }
4145 
4146 
4147 Method* InstanceKlass::method_with_orig_idnum(int idnum) {
4148   if (idnum >= methods()->length()) {
4149     return NULL;
4150   }
4151   Method* m = methods()->at(idnum);
4152   if (m != NULL && m->orig_method_idnum() == idnum) {
4153     return m;
4154   }
4155   // Obsolete method idnum does not match the original idnum
4156   for (int index = 0; index < methods()->length(); ++index) {
4157     m = methods()->at(index);
4158     if (m->orig_method_idnum() == idnum) {
4159       return m;
4160     }
4161   }
4162   // None found, return null for the caller to handle.
4163   return NULL;
4164 }
4165 
4166 
4167 Method* InstanceKlass::method_with_orig_idnum(int idnum, int version) {
4168   InstanceKlass* holder = get_klass_version(version);
4169   if (holder == NULL) {
4170     return NULL; // The version of klass is gone, no method is found
4171   }
4172   Method* method = holder->method_with_orig_idnum(idnum);
4173   return method;
4174 }
4175 
4176 #if INCLUDE_JVMTI
4177 JvmtiCachedClassFileData* InstanceKlass::get_cached_class_file() {
4178   return _cached_class_file;
4179 }
4180 
4181 jint InstanceKlass::get_cached_class_file_len() {
4182   return VM_RedefineClasses::get_cached_class_file_len(_cached_class_file);
4183 }
4184 
4185 unsigned char * InstanceKlass::get_cached_class_file_bytes() {
4186   return VM_RedefineClasses::get_cached_class_file_bytes(_cached_class_file);
4187 }
4188 #endif
4189 
4190 #define THROW_DVT_ERROR(s) \
4191   Exceptions::fthrow(THREAD_AND_LOCATION, vmSymbols::java_lang_IncompatibleClassChangeError(), \
4192       "ValueCapableClass class '%s' %s", external_name(),(s)); \
4193       return