jdk8-mips64-public/hotspot: src/share/vm/oops/instanceKlass.cpp@7dca5ed0e13d (annotated)

src/share/vm/oops/instanceKlass.cpp@7dca5ed0e13d (annotated)

src/share/vm/oops/instanceKlass.cpp

Tue, 02 Sep 2014 21:27:08 -0400

author: dholmes
date: Tue, 02 Sep 2014 21:27:08 -0400
changeset 7191: 7dca5ed0e13d
parent 7097: 14b8221771dc
child 7290: 90257dfad6e3
permissions: -rw-r--r--

8046210: Missing memory barrier when reading init_lock
Reviewed-by: fparain, dcubed, mdoerr
Contributed-by: Bill Pittore <bill.pittore@oracle.com>

 /*
  * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #include "precompiled.hpp"
 #include "classfile/javaClasses.hpp"
 #include "classfile/systemDictionary.hpp"
 #include "classfile/verifier.hpp"
 #include "classfile/vmSymbols.hpp"
 #include "compiler/compileBroker.hpp"
 #include "gc_implementation/shared/markSweep.inline.hpp"
 #include "gc_interface/collectedHeap.inline.hpp"
 #include "interpreter/oopMapCache.hpp"
 #include "interpreter/rewriter.hpp"
 #include "jvmtifiles/jvmti.h"
 #include "memory/genOopClosures.inline.hpp"
 #include "memory/heapInspection.hpp"
 #include "memory/iterator.inline.hpp"
 #include "memory/metadataFactory.hpp"
 #include "memory/oopFactory.hpp"
 #include "oops/fieldStreams.hpp"
 #include "oops/instanceClassLoaderKlass.hpp"
 #include "oops/instanceKlass.hpp"
 #include "oops/instanceMirrorKlass.hpp"
 #include "oops/instanceOop.hpp"
 #include "oops/klass.inline.hpp"
 #include "oops/method.hpp"
 #include "oops/oop.inline.hpp"
 #include "oops/symbol.hpp"
 #include "prims/jvmtiExport.hpp"
 #include "prims/jvmtiRedefineClassesTrace.hpp"
 #include "prims/jvmtiRedefineClasses.hpp"
 #include "prims/methodComparator.hpp"
 #include "runtime/fieldDescriptor.hpp"
 #include "runtime/handles.inline.hpp"
 #include "runtime/javaCalls.hpp"
 #include "runtime/mutexLocker.hpp"
 #include "runtime/orderAccess.inline.hpp"
 #include "runtime/thread.inline.hpp"
 #include "services/classLoadingService.hpp"
 #include "services/threadService.hpp"
 #include "utilities/dtrace.hpp"
 #include "utilities/macros.hpp"
 #if INCLUDE_ALL_GCS
 #include "gc_implementation/concurrentMarkSweep/cmsOopClosures.inline.hpp"
 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
 #include "gc_implementation/g1/g1OopClosures.inline.hpp"
 #include "gc_implementation/g1/g1RemSet.inline.hpp"
 #include "gc_implementation/g1/heapRegionManager.inline.hpp"
 #include "gc_implementation/parNew/parOopClosures.inline.hpp"
 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.inline.hpp"
 #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp"
 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"
 #include "oops/oop.pcgc.inline.hpp"
 #endif // INCLUDE_ALL_GCS
 #ifdef COMPILER1
 #include "c1/c1_Compiler.hpp"
 #endif
 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
 #ifdef DTRACE_ENABLED
 #ifndef USDT2
 HS_DTRACE_PROBE_DECL4(hotspot, class__initialization__required,
   char*, intptr_t, oop, intptr_t);
 HS_DTRACE_PROBE_DECL5(hotspot, class__initialization__recursive,
   char*, intptr_t, oop, intptr_t, int);
 HS_DTRACE_PROBE_DECL5(hotspot, class__initialization__concurrent,
   char*, intptr_t, oop, intptr_t, int);
 HS_DTRACE_PROBE_DECL5(hotspot, class__initialization__erroneous,
   char*, intptr_t, oop, intptr_t, int);
 HS_DTRACE_PROBE_DECL5(hotspot, class__initialization__super__failed,
   char*, intptr_t, oop, intptr_t, int);
 HS_DTRACE_PROBE_DECL5(hotspot, class__initialization__clinit,
   char*, intptr_t, oop, intptr_t, int);
 HS_DTRACE_PROBE_DECL5(hotspot, class__initialization__error,
   char*, intptr_t, oop, intptr_t, int);
 HS_DTRACE_PROBE_DECL5(hotspot, class__initialization__end,
   char*, intptr_t, oop, intptr_t, int);
 #define DTRACE_CLASSINIT_PROBE(type, clss, thread_type)          \
   {                                                              \
     char* data = NULL;                                           \
     int len = 0;                                                 \
     Symbol* name = (clss)->name();                               \
     if (name != NULL) {                                          \
       data = (char*)name->bytes();                               \
       len = name->utf8_length();                                 \
     }                                                            \
     HS_DTRACE_PROBE4(hotspot, class__initialization__##type,     \
       data, len, SOLARIS_ONLY((void *))(clss)->class_loader(), thread_type);           \
   }
 #define DTRACE_CLASSINIT_PROBE_WAIT(type, clss, thread_type, wait) \
   {                                                              \
     char* data = NULL;                                           \
     int len = 0;                                                 \
     Symbol* name = (clss)->name();                               \
     if (name != NULL) {                                          \
       data = (char*)name->bytes();                               \
       len = name->utf8_length();                                 \
     }                                                            \
     HS_DTRACE_PROBE5(hotspot, class__initialization__##type,     \
       data, len, SOLARIS_ONLY((void *))(clss)->class_loader(), thread_type, wait);     \
   }
 #else /* USDT2 */
 #define HOTSPOT_CLASS_INITIALIZATION_required HOTSPOT_CLASS_INITIALIZATION_REQUIRED
 #define HOTSPOT_CLASS_INITIALIZATION_recursive HOTSPOT_CLASS_INITIALIZATION_RECURSIVE
 #define HOTSPOT_CLASS_INITIALIZATION_concurrent HOTSPOT_CLASS_INITIALIZATION_CONCURRENT
 #define HOTSPOT_CLASS_INITIALIZATION_erroneous HOTSPOT_CLASS_INITIALIZATION_ERRONEOUS
 #define HOTSPOT_CLASS_INITIALIZATION_super__failed HOTSPOT_CLASS_INITIALIZATION_SUPER_FAILED
 #define HOTSPOT_CLASS_INITIALIZATION_clinit HOTSPOT_CLASS_INITIALIZATION_CLINIT
 #define HOTSPOT_CLASS_INITIALIZATION_error HOTSPOT_CLASS_INITIALIZATION_ERROR
 #define HOTSPOT_CLASS_INITIALIZATION_end HOTSPOT_CLASS_INITIALIZATION_END
 #define DTRACE_CLASSINIT_PROBE(type, clss, thread_type)          \
   {                                                              \
     char* data = NULL;                                           \
     int len = 0;                                                 \
     Symbol* name = (clss)->name();                               \
     if (name != NULL) {                                          \
       data = (char*)name->bytes();                               \
       len = name->utf8_length();                                 \
     }                                                            \
     HOTSPOT_CLASS_INITIALIZATION_##type(                         \
       data, len, (clss)->class_loader(), thread_type);           \
   }
 #define DTRACE_CLASSINIT_PROBE_WAIT(type, clss, thread_type, wait) \
   {                                                              \
     char* data = NULL;                                           \
     int len = 0;                                                 \
     Symbol* name = (clss)->name();                               \
     if (name != NULL) {                                          \
       data = (char*)name->bytes();                               \
       len = name->utf8_length();                                 \
     }                                                            \
     HOTSPOT_CLASS_INITIALIZATION_##type(                         \
       data, len, (clss)->class_loader(), thread_type, wait);     \
   }
 #endif /* USDT2 */
 #else //  ndef DTRACE_ENABLED
 #define DTRACE_CLASSINIT_PROBE(type, clss, thread_type)
 #define DTRACE_CLASSINIT_PROBE_WAIT(type, clss, thread_type, wait)
 #endif //  ndef DTRACE_ENABLED
 volatile int InstanceKlass::_total_instanceKlass_count = 0;
 InstanceKlass* InstanceKlass::allocate_instance_klass(
                                               ClassLoaderData* loader_data,
                                               int vtable_len,
                                               int itable_len,
                                               int static_field_size,
                                               int nonstatic_oop_map_size,
                                               ReferenceType rt,
                                               AccessFlags access_flags,
                                               Symbol* name,
                                               Klass* super_klass,
                                               bool is_anonymous,
                                               TRAPS) {
   int size = InstanceKlass::size(vtable_len, itable_len, nonstatic_oop_map_size,
                                  access_flags.is_interface(), is_anonymous);
   // Allocation
   InstanceKlass* ik;
   if (rt == REF_NONE) {
     if (name == vmSymbols::java_lang_Class()) {
       ik = new (loader_data, size, THREAD) InstanceMirrorKlass(
         vtable_len, itable_len, static_field_size, nonstatic_oop_map_size, rt,
         access_flags, is_anonymous);
     } else if (name == vmSymbols::java_lang_ClassLoader() ||
           (SystemDictionary::ClassLoader_klass_loaded() &&
           super_klass != NULL &&
           super_klass->is_subtype_of(SystemDictionary::ClassLoader_klass()))) {
       ik = new (loader_data, size, THREAD) InstanceClassLoaderKlass(
         vtable_len, itable_len, static_field_size, nonstatic_oop_map_size, rt,
         access_flags, is_anonymous);
     } else {
       // normal class
       ik = new (loader_data, size, THREAD) InstanceKlass(
         vtable_len, itable_len, static_field_size, nonstatic_oop_map_size, rt,
         access_flags, is_anonymous);
     }
   } else {
     // reference klass
     ik = new (loader_data, size, THREAD) InstanceRefKlass(
         vtable_len, itable_len, static_field_size, nonstatic_oop_map_size, rt,
         access_flags, is_anonymous);
   }
   // Check for pending exception before adding to the loader data and incrementing
   // class count.  Can get OOM here.
   if (HAS_PENDING_EXCEPTION) {
     return NULL;
   }
   // Add all classes to our internal class loader list here,
   // including classes in the bootstrap (NULL) class loader.
   loader_data->add_class(ik);
   Atomic::inc(&_total_instanceKlass_count);
   return ik;
 }
 // copy method ordering from resource area to Metaspace
 void InstanceKlass::copy_method_ordering(intArray* m, TRAPS) {
   if (m != NULL) {
     // allocate a new array and copy contents (memcpy?)
     _method_ordering = MetadataFactory::new_array<int>(class_loader_data(), m->length(), CHECK);
     for (int i = 0; i < m->length(); i++) {
       _method_ordering->at_put(i, m->at(i));
     }
   } else {
     _method_ordering = Universe::the_empty_int_array();
   }
 }
 // create a new array of vtable_indices for default methods
 Array<int>* InstanceKlass::create_new_default_vtable_indices(int len, TRAPS) {
   Array<int>* vtable_indices = MetadataFactory::new_array<int>(class_loader_data(), len, CHECK_NULL);
   assert(default_vtable_indices() == NULL, "only create once");
   set_default_vtable_indices(vtable_indices);
   return vtable_indices;
 }
 InstanceKlass::InstanceKlass(int vtable_len,
                              int itable_len,
                              int static_field_size,
                              int nonstatic_oop_map_size,
                              ReferenceType rt,
                              AccessFlags access_flags,
                              bool is_anonymous) {
   No_Safepoint_Verifier no_safepoint; // until k becomes parsable
   int iksize = InstanceKlass::size(vtable_len, itable_len, nonstatic_oop_map_size,
                                    access_flags.is_interface(), is_anonymous);
   set_vtable_length(vtable_len);
   set_itable_length(itable_len);
   set_static_field_size(static_field_size);
   set_nonstatic_oop_map_size(nonstatic_oop_map_size);
   set_access_flags(access_flags);
   _misc_flags = 0;  // initialize to zero
   set_is_anonymous(is_anonymous);
   assert(size() == iksize, "wrong size for object");
   set_array_klasses(NULL);
   set_methods(NULL);
   set_method_ordering(NULL);
   set_default_methods(NULL);
   set_default_vtable_indices(NULL);
   set_local_interfaces(NULL);
   set_transitive_interfaces(NULL);
   init_implementor();
   set_fields(NULL, 0);
   set_constants(NULL);
   set_class_loader_data(NULL);
   set_source_file_name_index(0);
   set_source_debug_extension(NULL, 0);
   set_array_name(NULL);
   set_inner_classes(NULL);
   set_static_oop_field_count(0);
   set_nonstatic_field_size(0);
   set_is_marked_dependent(false);
   set_has_unloaded_dependent(false);
   set_init_state(InstanceKlass::allocated);
   set_init_thread(NULL);
   set_reference_type(rt);
   set_oop_map_cache(NULL);
   set_jni_ids(NULL);
   set_osr_nmethods_head(NULL);
   set_breakpoints(NULL);
   init_previous_versions();
   set_generic_signature_index(0);
   release_set_methods_jmethod_ids(NULL);
   set_annotations(NULL);
   set_jvmti_cached_class_field_map(NULL);
   set_initial_method_idnum(0);
   _dependencies = NULL;
   set_jvmti_cached_class_field_map(NULL);
   set_cached_class_file(NULL);
   set_initial_method_idnum(0);
   set_minor_version(0);
   set_major_version(0);
   NOT_PRODUCT(_verify_count = 0;)
   // initialize the non-header words to zero
   intptr_t* p = (intptr_t*)this;
   for (int index = InstanceKlass::header_size(); index < iksize; index++) {
     p[index] = NULL_WORD;
   }
   // Set temporary value until parseClassFile updates it with the real instance
   // size.
   set_layout_helper(Klass::instance_layout_helper(0, true));
 }
 void InstanceKlass::deallocate_methods(ClassLoaderData* loader_data,
                                        Array<Method*>* methods) {
   if (methods != NULL && methods != Universe::the_empty_method_array() &&
       !methods->is_shared()) {
     for (int i = 0; i < methods->length(); i++) {
       Method* method = methods->at(i);
       if (method == NULL) continue;  // maybe null if error processing
       // Only want to delete methods that are not executing for RedefineClasses.
       // The previous version will point to them so they're not totally dangling
       assert (!method->on_stack(), "shouldn't be called with methods on stack");
       MetadataFactory::free_metadata(loader_data, method);
     }
     MetadataFactory::free_array<Method*>(loader_data, methods);
   }
 }
 void InstanceKlass::deallocate_interfaces(ClassLoaderData* loader_data,
                                           Klass* super_klass,
                                           Array<Klass*>* local_interfaces,
                                           Array<Klass*>* transitive_interfaces) {
   // Only deallocate transitive interfaces if not empty, same as super class
   // or same as local interfaces.  See code in parseClassFile.
   Array<Klass*>* ti = transitive_interfaces;
   if (ti != Universe::the_empty_klass_array() && ti != local_interfaces) {
     // check that the interfaces don't come from super class
     Array<Klass*>* sti = (super_klass == NULL) ? NULL :
                     InstanceKlass::cast(super_klass)->transitive_interfaces();
     if (ti != sti && ti != NULL && !ti->is_shared()) {
       MetadataFactory::free_array<Klass*>(loader_data, ti);
     }
   }
   // local interfaces can be empty
   if (local_interfaces != Universe::the_empty_klass_array() &&
       local_interfaces != NULL && !local_interfaces->is_shared()) {
     MetadataFactory::free_array<Klass*>(loader_data, local_interfaces);
   }
 }
 // This function deallocates the metadata and C heap pointers that the
 // InstanceKlass points to.
 void InstanceKlass::deallocate_contents(ClassLoaderData* loader_data) {
   // Orphan the mirror first, CMS thinks it's still live.
   if (java_mirror() != NULL) {
     java_lang_Class::set_klass(java_mirror(), NULL);
   }
   // Need to take this class off the class loader data list.
   loader_data->remove_class(this);
   // The array_klass for this class is created later, after error handling.
   // For class redefinition, we keep the original class so this scratch class
   // doesn't have an array class.  Either way, assert that there is nothing
   // to deallocate.
   assert(array_klasses() == NULL, "array classes shouldn't be created for this class yet");
   // Release C heap allocated data that this might point to, which includes
   // reference counting symbol names.
   release_C_heap_structures();
   deallocate_methods(loader_data, methods());
   set_methods(NULL);
   if (method_ordering() != NULL &&
       method_ordering() != Universe::the_empty_int_array() &&
       !method_ordering()->is_shared()) {
     MetadataFactory::free_array<int>(loader_data, method_ordering());
   }
   set_method_ordering(NULL);
   // default methods can be empty
   if (default_methods() != NULL &&
       default_methods() != Universe::the_empty_method_array() &&
       !default_methods()->is_shared()) {
     MetadataFactory::free_array<Method*>(loader_data, default_methods());
   }
   // Do NOT deallocate the default methods, they are owned by superinterfaces.
   set_default_methods(NULL);
   // default methods vtable indices can be empty
   if (default_vtable_indices() != NULL &&
       !default_vtable_indices()->is_shared()) {
     MetadataFactory::free_array<int>(loader_data, default_vtable_indices());
   }
   set_default_vtable_indices(NULL);
   // This array is in Klass, but remove it with the InstanceKlass since
   // this place would be the only caller and it can share memory with transitive
   // interfaces.
   if (secondary_supers() != NULL &&
       secondary_supers() != Universe::the_empty_klass_array() &&
       secondary_supers() != transitive_interfaces() &&
       !secondary_supers()->is_shared()) {
     MetadataFactory::free_array<Klass*>(loader_data, secondary_supers());
   }
   set_secondary_supers(NULL);
   deallocate_interfaces(loader_data, super(), local_interfaces(), transitive_interfaces());
   set_transitive_interfaces(NULL);
   set_local_interfaces(NULL);
   if (fields() != NULL && !fields()->is_shared()) {
     MetadataFactory::free_array<jushort>(loader_data, fields());
   }
   set_fields(NULL, 0);
   // If a method from a redefined class is using this constant pool, don't
   // delete it, yet.  The new class's previous version will point to this.
   if (constants() != NULL) {
     assert (!constants()->on_stack(), "shouldn't be called if anything is onstack");
     if (!constants()->is_shared()) {
       MetadataFactory::free_metadata(loader_data, constants());
     }
     set_constants(NULL);
   }
   if (inner_classes() != NULL &&
       inner_classes() != Universe::the_empty_short_array() &&
       !inner_classes()->is_shared()) {
     MetadataFactory::free_array<jushort>(loader_data, inner_classes());
   }
   set_inner_classes(NULL);
   // We should deallocate the Annotations instance if it's not in shared spaces.
   if (annotations() != NULL && !annotations()->is_shared()) {
     MetadataFactory::free_metadata(loader_data, annotations());
   }
   set_annotations(NULL);
 }
 bool InstanceKlass::should_be_initialized() const {
   return !is_initialized();
 }
 klassVtable* InstanceKlass::vtable() const {
   return new klassVtable(this, start_of_vtable(), vtable_length() / vtableEntry::size());
 }
 klassItable* InstanceKlass::itable() const {
   return new klassItable(instanceKlassHandle(this));
 }
 void InstanceKlass::eager_initialize(Thread *thread) {
   if (!EagerInitialization) return;
   if (this->is_not_initialized()) {
     // abort if the the class has a class initializer
     if (this->class_initializer() != NULL) return;
     // abort if it is java.lang.Object (initialization is handled in genesis)
     Klass* super = this->super();
     if (super == NULL) return;
     // abort if the super class should be initialized
     if (!InstanceKlass::cast(super)->is_initialized()) return;
     // call body to expose the this pointer
     instanceKlassHandle this_oop(thread, this);
     eager_initialize_impl(this_oop);
   }
 }
 // JVMTI spec thinks there are signers and protection domain in the
 // instanceKlass.  These accessors pretend these fields are there.
 // The hprof specification also thinks these fields are in InstanceKlass.
 oop InstanceKlass::protection_domain() const {
   // return the protection_domain from the mirror
   return java_lang_Class::protection_domain(java_mirror());
 }
 // To remove these from requires an incompatible change and CCC request.
 objArrayOop InstanceKlass::signers() const {
   // return the signers from the mirror
   return java_lang_Class::signers(java_mirror());
 }
 oop InstanceKlass::init_lock() const {
   // return the init lock from the mirror
   oop lock = java_lang_Class::init_lock(java_mirror());
   // Prevent reordering with any access of initialization state
   OrderAccess::loadload();
   assert((oop)lock != NULL || !is_not_initialized(), // initialized or in_error state
          "only fully initialized state can have a null lock");
   return lock;
 }
 // Set the initialization lock to null so the object can be GC'ed.  Any racing
 // threads to get this lock will see a null lock and will not lock.
 // That's okay because they all check for initialized state after getting
 // the lock and return.
 void InstanceKlass::fence_and_clear_init_lock() {
   // make sure previous stores are all done, notably the init_state.
   OrderAccess::storestore();
   java_lang_Class::set_init_lock(java_mirror(), NULL);
   assert(!is_not_initialized(), "class must be initialized now");
 }
 void InstanceKlass::eager_initialize_impl(instanceKlassHandle this_oop) {
   EXCEPTION_MARK;
   oop init_lock = this_oop->init_lock();
   ObjectLocker ol(init_lock, THREAD, init_lock != NULL);
   // abort if someone beat us to the initialization
   if (!this_oop->is_not_initialized()) return;  // note: not equivalent to is_initialized()
   ClassState old_state = this_oop->init_state();
   link_class_impl(this_oop, true, THREAD);
   if (HAS_PENDING_EXCEPTION) {
     CLEAR_PENDING_EXCEPTION;
     // Abort if linking the class throws an exception.
     // Use a test to avoid redundantly resetting the state if there's
     // no change.  Set_init_state() asserts that state changes make
     // progress, whereas here we might just be spinning in place.
     if( old_state != this_oop->_init_state )
       this_oop->set_init_state (old_state);
   } else {
     // linking successfull, mark class as initialized
     this_oop->set_init_state (fully_initialized);
     this_oop->fence_and_clear_init_lock();
     // trace
     if (TraceClassInitialization) {
       ResourceMark rm(THREAD);
       tty->print_cr("[Initialized %s without side effects]", this_oop->external_name());
     }
   }
 }
 // See "The Virtual Machine Specification" section 2.16.5 for a detailed explanation of the class initialization
 // process. The step comments refers to the procedure described in that section.
 // Note: implementation moved to static method to expose the this pointer.
 void InstanceKlass::initialize(TRAPS) {
   if (this->should_be_initialized()) {
     HandleMark hm(THREAD);
     instanceKlassHandle this_oop(THREAD, this);
     initialize_impl(this_oop, CHECK);
     // Note: at this point the class may be initialized
     //       OR it may be in the state of being initialized
     //       in case of recursive initialization!
   } else {
     assert(is_initialized(), "sanity check");
   }
 }
 bool InstanceKlass::verify_code(
     instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS) {
   // 1) Verify the bytecodes
   Verifier::Mode mode =
     throw_verifyerror ? Verifier::ThrowException : Verifier::NoException;
   return Verifier::verify(this_oop, mode, this_oop->should_verify_class(), CHECK_false);
 }
 // Used exclusively by the shared spaces dump mechanism to prevent
 // classes mapped into the shared regions in new VMs from appearing linked.
 void InstanceKlass::unlink_class() {
   assert(is_linked(), "must be linked");
   _init_state = loaded;
 }
 void InstanceKlass::link_class(TRAPS) {
   assert(is_loaded(), "must be loaded");
   if (!is_linked()) {
     HandleMark hm(THREAD);
     instanceKlassHandle this_oop(THREAD, this);
     link_class_impl(this_oop, true, CHECK);
   }
 }
 // Called to verify that a class can link during initialization, without
 // throwing a VerifyError.
 bool InstanceKlass::link_class_or_fail(TRAPS) {
   assert(is_loaded(), "must be loaded");
   if (!is_linked()) {
     HandleMark hm(THREAD);
     instanceKlassHandle this_oop(THREAD, this);
     link_class_impl(this_oop, false, CHECK_false);
   }
   return is_linked();
 }
 bool InstanceKlass::link_class_impl(
     instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS) {
   // check for error state
   if (this_oop->is_in_error_state()) {
     ResourceMark rm(THREAD);
     THROW_MSG_(vmSymbols::java_lang_NoClassDefFoundError(),
                this_oop->external_name(), false);
   }
   // return if already verified
   if (this_oop->is_linked()) {
     return true;
   }
   // Timing
   // timer handles recursion
   assert(THREAD->is_Java_thread(), "non-JavaThread in link_class_impl");
   JavaThread* jt = (JavaThread*)THREAD;
   // link super class before linking this class
   instanceKlassHandle super(THREAD, this_oop->super());
   if (super.not_null()) {
     if (super->is_interface()) {  // check if super class is an interface
       ResourceMark rm(THREAD);
       Exceptions::fthrow(
         THREAD_AND_LOCATION,
         vmSymbols::java_lang_IncompatibleClassChangeError(),
         "class %s has interface %s as super class",
         this_oop->external_name(),
         super->external_name()
       );
       return false;
     }
     link_class_impl(super, throw_verifyerror, CHECK_false);
   }
   // link all interfaces implemented by this class before linking this class
   Array<Klass*>* interfaces = this_oop->local_interfaces();
   int num_interfaces = interfaces->length();
   for (int index = 0; index < num_interfaces; index++) {
     HandleMark hm(THREAD);
     instanceKlassHandle ih(THREAD, interfaces->at(index));
     link_class_impl(ih, throw_verifyerror, CHECK_false);
   }
   // in case the class is linked in the process of linking its superclasses
   if (this_oop->is_linked()) {
     return true;
   }
   // trace only the link time for this klass that includes
   // the verification time
   PerfClassTraceTime vmtimer(ClassLoader::perf_class_link_time(),
                              ClassLoader::perf_class_link_selftime(),
                              ClassLoader::perf_classes_linked(),
                              jt->get_thread_stat()->perf_recursion_counts_addr(),
                              jt->get_thread_stat()->perf_timers_addr(),
                              PerfClassTraceTime::CLASS_LINK);
   // verification & rewriting
   {
     oop init_lock = this_oop->init_lock();
     ObjectLocker ol(init_lock, THREAD, init_lock != NULL);
     // rewritten will have been set if loader constraint error found
     // on an earlier link attempt
     // don't verify or rewrite if already rewritten
     if (!this_oop->is_linked()) {
       if (!this_oop->is_rewritten()) {
         {
           // Timer includes any side effects of class verification (resolution,
           // etc), but not recursive entry into verify_code().
           PerfClassTraceTime timer(ClassLoader::perf_class_verify_time(),
                                    ClassLoader::perf_class_verify_selftime(),
                                    ClassLoader::perf_classes_verified(),
                                    jt->get_thread_stat()->perf_recursion_counts_addr(),
                                    jt->get_thread_stat()->perf_timers_addr(),
                                    PerfClassTraceTime::CLASS_VERIFY);
           bool verify_ok = verify_code(this_oop, throw_verifyerror, THREAD);
           if (!verify_ok) {
             return false;
           }
         }
         // Just in case a side-effect of verify linked this class already
         // (which can sometimes happen since the verifier loads classes
         // using custom class loaders, which are free to initialize things)
         if (this_oop->is_linked()) {
           return true;
         }
         // also sets rewritten
         this_oop->rewrite_class(CHECK_false);
       }
       // relocate jsrs and link methods after they are all rewritten
       this_oop->link_methods(CHECK_false);
       // Initialize the vtable and interface table after
       // methods have been rewritten since rewrite may
       // fabricate new Method*s.
       // also does loader constraint checking
       if (!this_oop()->is_shared()) {
         ResourceMark rm(THREAD);
         this_oop->vtable()->initialize_vtable(true, CHECK_false);
         this_oop->itable()->initialize_itable(true, CHECK_false);
       }
 #ifdef ASSERT
       else {
         ResourceMark rm(THREAD);
         this_oop->vtable()->verify(tty, true);
         // In case itable verification is ever added.
         // this_oop->itable()->verify(tty, true);
       }
 #endif
       this_oop->set_init_state(linked);
       if (JvmtiExport::should_post_class_prepare()) {
         Thread *thread = THREAD;
         assert(thread->is_Java_thread(), "thread->is_Java_thread()");
         JvmtiExport::post_class_prepare((JavaThread *) thread, this_oop());
       }
     }
   }
   return true;
 }
 // Rewrite the byte codes of all of the methods of a class.
 // The rewriter must be called exactly once. Rewriting must happen after
 // verification but before the first method of the class is executed.
 void InstanceKlass::rewrite_class(TRAPS) {
   assert(is_loaded(), "must be loaded");
   instanceKlassHandle this_oop(THREAD, this);
   if (this_oop->is_rewritten()) {
     assert(this_oop()->is_shared(), "rewriting an unshared class?");
     return;
   }
   Rewriter::rewrite(this_oop, CHECK);
   this_oop->set_rewritten();
 }
 // Now relocate and link method entry points after class is rewritten.
 // This is outside is_rewritten flag. In case of an exception, it can be
 // executed more than once.
 void InstanceKlass::link_methods(TRAPS) {
   int len = methods()->length();
   for (int i = len-1; i >= 0; i--) {
     methodHandle m(THREAD, methods()->at(i));
     // Set up method entry points for compiler and interpreter    .
     m->link_method(m, CHECK);
     // This is for JVMTI and unrelated to relocator but the last thing we do
 #ifdef ASSERT
     if (StressMethodComparator) {
       ResourceMark rm(THREAD);
       static int nmc = 0;
       for (int j = i; j >= 0 && j >= i-4; j--) {
         if ((++nmc % 1000) == 0)  tty->print_cr("Have run MethodComparator %d times...", nmc);
         bool z = MethodComparator::methods_EMCP(m(),
                    methods()->at(j));
         if (j == i && !z) {
           tty->print("MethodComparator FAIL: "); m->print(); m->print_codes();
           assert(z, "method must compare equal to itself");
         }
       }
     }
 #endif //ASSERT
   }
 }
 void InstanceKlass::initialize_impl(instanceKlassHandle this_oop, TRAPS) {
   // Make sure klass is linked (verified) before initialization
   // A class could already be verified, since it has been reflected upon.
   this_oop->link_class(CHECK);
   DTRACE_CLASSINIT_PROBE(required, InstanceKlass::cast(this_oop()), -1);
   bool wait = false;
   // refer to the JVM book page 47 for description of steps
   // Step 1
   {
     oop init_lock = this_oop->init_lock();
     ObjectLocker ol(init_lock, THREAD, init_lock != NULL);
     Thread *self = THREAD; // it's passed the current thread
     // Step 2
     // If we were to use wait() instead of waitInterruptibly() then
     // we might end up throwing IE from link/symbol resolution sites
     // that aren't expected to throw.  This would wreak havoc.  See 6320309.
     while(this_oop->is_being_initialized() && !this_oop->is_reentrant_initialization(self)) {
         wait = true;
       ol.waitUninterruptibly(CHECK);
     }
     // Step 3
     if (this_oop->is_being_initialized() && this_oop->is_reentrant_initialization(self)) {
       DTRACE_CLASSINIT_PROBE_WAIT(recursive, InstanceKlass::cast(this_oop()), -1,wait);
       return;
     }
     // Step 4
     if (this_oop->is_initialized()) {
       DTRACE_CLASSINIT_PROBE_WAIT(concurrent, InstanceKlass::cast(this_oop()), -1,wait);
       return;
     }
     // Step 5
     if (this_oop->is_in_error_state()) {
       DTRACE_CLASSINIT_PROBE_WAIT(erroneous, InstanceKlass::cast(this_oop()), -1,wait);
       ResourceMark rm(THREAD);
       const char* desc = "Could not initialize class ";
       const char* className = this_oop->external_name();
       size_t msglen = strlen(desc) + strlen(className) + 1;
       char* message = NEW_RESOURCE_ARRAY(char, msglen);
       if (NULL == message) {
         // Out of memory: can't create detailed error message
         THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), className);
       } else {
         jio_snprintf(message, msglen, "%s%s", desc, className);
         THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), message);
       }
     }
     // Step 6
     this_oop->set_init_state(being_initialized);
     this_oop->set_init_thread(self);
   }
   // Step 7
   Klass* super_klass = this_oop->super();
   if (super_klass != NULL && !this_oop->is_interface() && super_klass->should_be_initialized()) {
     super_klass->initialize(THREAD);
     if (HAS_PENDING_EXCEPTION) {
       Handle e(THREAD, PENDING_EXCEPTION);
       CLEAR_PENDING_EXCEPTION;
       {
         EXCEPTION_MARK;
         this_oop->set_initialization_state_and_notify(initialization_error, THREAD); // Locks object, set state, and notify all waiting threads
         CLEAR_PENDING_EXCEPTION;   // ignore any exception thrown, superclass initialization error is thrown below
       }
       DTRACE_CLASSINIT_PROBE_WAIT(super__failed, InstanceKlass::cast(this_oop()), -1,wait);
       THROW_OOP(e());
     }
   }
   if (this_oop->has_default_methods()) {
     // Step 7.5: initialize any interfaces which have default methods
     for (int i = 0; i < this_oop->local_interfaces()->length(); ++i) {
       Klass* iface = this_oop->local_interfaces()->at(i);
       InstanceKlass* ik = InstanceKlass::cast(iface);
       if (ik->has_default_methods() && ik->should_be_initialized()) {
         ik->initialize(THREAD);
         if (HAS_PENDING_EXCEPTION) {
           Handle e(THREAD, PENDING_EXCEPTION);
           CLEAR_PENDING_EXCEPTION;
           {
             EXCEPTION_MARK;
             // Locks object, set state, and notify all waiting threads
             this_oop->set_initialization_state_and_notify(
                 initialization_error, THREAD);
             // ignore any exception thrown, superclass initialization error is
             // thrown below
             CLEAR_PENDING_EXCEPTION;
           }
           DTRACE_CLASSINIT_PROBE_WAIT(
               super__failed, InstanceKlass::cast(this_oop()), -1, wait);
           THROW_OOP(e());
         }
       }
     }
   }
   // Step 8
   {
     assert(THREAD->is_Java_thread(), "non-JavaThread in initialize_impl");
     JavaThread* jt = (JavaThread*)THREAD;
     DTRACE_CLASSINIT_PROBE_WAIT(clinit, InstanceKlass::cast(this_oop()), -1,wait);
     // Timer includes any side effects of class initialization (resolution,
     // etc), but not recursive entry into call_class_initializer().
     PerfClassTraceTime timer(ClassLoader::perf_class_init_time(),
                              ClassLoader::perf_class_init_selftime(),
                              ClassLoader::perf_classes_inited(),
                              jt->get_thread_stat()->perf_recursion_counts_addr(),
                              jt->get_thread_stat()->perf_timers_addr(),
                              PerfClassTraceTime::CLASS_CLINIT);
     this_oop->call_class_initializer(THREAD);
   }
   // Step 9
   if (!HAS_PENDING_EXCEPTION) {
     this_oop->set_initialization_state_and_notify(fully_initialized, CHECK);
     { ResourceMark rm(THREAD);
       debug_only(this_oop->vtable()->verify(tty, true);)
     }
   }
   else {
     // Step 10 and 11
     Handle e(THREAD, PENDING_EXCEPTION);
     CLEAR_PENDING_EXCEPTION;
     {
       EXCEPTION_MARK;
       this_oop->set_initialization_state_and_notify(initialization_error, THREAD);
       CLEAR_PENDING_EXCEPTION;   // ignore any exception thrown, class initialization error is thrown below
     }
     DTRACE_CLASSINIT_PROBE_WAIT(error, InstanceKlass::cast(this_oop()), -1,wait);
     if (e->is_a(SystemDictionary::Error_klass())) {
       THROW_OOP(e());
     } else {
       JavaCallArguments args(e);
       THROW_ARG(vmSymbols::java_lang_ExceptionInInitializerError(),
                 vmSymbols::throwable_void_signature(),
                 &args);
     }
   }
   DTRACE_CLASSINIT_PROBE_WAIT(end, InstanceKlass::cast(this_oop()), -1,wait);
 }
 // Note: implementation moved to static method to expose the this pointer.
 void InstanceKlass::set_initialization_state_and_notify(ClassState state, TRAPS) {
   instanceKlassHandle kh(THREAD, this);
   set_initialization_state_and_notify_impl(kh, state, CHECK);
 }
 void InstanceKlass::set_initialization_state_and_notify_impl(instanceKlassHandle this_oop, ClassState state, TRAPS) {
   oop init_lock = this_oop->init_lock();
   ObjectLocker ol(init_lock, THREAD, init_lock != NULL);
   this_oop->set_init_state(state);
   this_oop->fence_and_clear_init_lock();
   ol.notify_all(CHECK);
 }
 // The embedded _implementor field can only record one implementor.
 // When there are more than one implementors, the _implementor field
 // is set to the interface Klass* itself. Following are the possible
 // values for the _implementor field:
 //   NULL                  - no implementor
 //   implementor Klass*    - one implementor
 //   self                  - more than one implementor
 //
 // The _implementor field only exists for interfaces.
 void InstanceKlass::add_implementor(Klass* k) {
   assert(Compile_lock->owned_by_self(), "");
   assert(is_interface(), "not interface");
   // Filter out my subinterfaces.
   // (Note: Interfaces are never on the subklass list.)
   if (InstanceKlass::cast(k)->is_interface()) return;
   // Filter out subclasses whose supers already implement me.
   // (Note: CHA must walk subclasses of direct implementors
   // in order to locate indirect implementors.)
   Klass* sk = InstanceKlass::cast(k)->super();
   if (sk != NULL && InstanceKlass::cast(sk)->implements_interface(this))
     // We only need to check one immediate superclass, since the
     // implements_interface query looks at transitive_interfaces.
     // Any supers of the super have the same (or fewer) transitive_interfaces.
     return;
   Klass* ik = implementor();
   if (ik == NULL) {
     set_implementor(k);
   } else if (ik != this) {
     // There is already an implementor. Use itself as an indicator of
     // more than one implementors.
     set_implementor(this);
   }
   // The implementor also implements the transitive_interfaces
   for (int index = 0; index < local_interfaces()->length(); index++) {
     InstanceKlass::cast(local_interfaces()->at(index))->add_implementor(k);
   }
 }
 void InstanceKlass::init_implementor() {
   if (is_interface()) {
     set_implementor(NULL);
   }
 }
 void InstanceKlass::process_interfaces(Thread *thread) {
   // link this class into the implementors list of every interface it implements
   Klass* this_as_klass_oop = this;
   for (int i = local_interfaces()->length() - 1; i >= 0; i--) {
     assert(local_interfaces()->at(i)->is_klass(), "must be a klass");
     InstanceKlass* interf = InstanceKlass::cast(local_interfaces()->at(i));
     assert(interf->is_interface(), "expected interface");
     interf->add_implementor(this_as_klass_oop);
   }
 }
 bool InstanceKlass::can_be_primary_super_slow() const {
   if (is_interface())
     return false;
   else
     return Klass::can_be_primary_super_slow();
 }
 GrowableArray<Klass*>* InstanceKlass::compute_secondary_supers(int num_extra_slots) {
   // The secondaries are the implemented interfaces.
   InstanceKlass* ik = InstanceKlass::cast(this);
   Array<Klass*>* interfaces = ik->transitive_interfaces();
   int num_secondaries = num_extra_slots + interfaces->length();
   if (num_secondaries == 0) {
     // Must share this for correct bootstrapping!
     set_secondary_supers(Universe::the_empty_klass_array());
     return NULL;
   } else if (num_extra_slots == 0) {
     // The secondary super list is exactly the same as the transitive interfaces.
     // Redefine classes has to be careful not to delete this!
     set_secondary_supers(interfaces);
     return NULL;
   } else {
     // Copy transitive interfaces to a temporary growable array to be constructed
     // into the secondary super list with extra slots.
     GrowableArray<Klass*>* secondaries = new GrowableArray<Klass*>(interfaces->length());
     for (int i = 0; i < interfaces->length(); i++) {
       secondaries->push(interfaces->at(i));
     }
     return secondaries;
   }
 }
 bool InstanceKlass::compute_is_subtype_of(Klass* k) {
   if (k->is_interface()) {
     return implements_interface(k);
   } else {
     return Klass::compute_is_subtype_of(k);
   }
 }
 bool InstanceKlass::implements_interface(Klass* k) const {
   if (this == k) return true;
   assert(k->is_interface(), "should be an interface class");
   for (int i = 0; i < transitive_interfaces()->length(); i++) {
     if (transitive_interfaces()->at(i) == k) {
       return true;
     }
   }
   return false;
 }
 bool InstanceKlass::is_same_or_direct_interface(Klass *k) const {
   // Verify direct super interface
   if (this == k) return true;
   assert(k->is_interface(), "should be an interface class");
   for (int i = 0; i < local_interfaces()->length(); i++) {
     if (local_interfaces()->at(i) == k) {
       return true;
     }
   }
   return false;
 }
 objArrayOop InstanceKlass::allocate_objArray(int n, int length, TRAPS) {
   if (length < 0) THROW_0(vmSymbols::java_lang_NegativeArraySizeException());
   if (length > arrayOopDesc::max_array_length(T_OBJECT)) {
     report_java_out_of_memory("Requested array size exceeds VM limit");
     JvmtiExport::post_array_size_exhausted();
     THROW_OOP_0(Universe::out_of_memory_error_array_size());
   }
   int size = objArrayOopDesc::object_size(length);
   Klass* ak = array_klass(n, CHECK_NULL);
   KlassHandle h_ak (THREAD, ak);
   objArrayOop o =
     (objArrayOop)CollectedHeap::array_allocate(h_ak, size, length, CHECK_NULL);
   return o;
 }
 instanceOop InstanceKlass::register_finalizer(instanceOop i, TRAPS) {
   if (TraceFinalizerRegistration) {
     tty->print("Registered ");
     i->print_value_on(tty);
     tty->print_cr(" (" INTPTR_FORMAT ") as finalizable", (address)i);
   }
   instanceHandle h_i(THREAD, i);
   // Pass the handle as argument, JavaCalls::call expects oop as jobjects
   JavaValue result(T_VOID);
   JavaCallArguments args(h_i);
   methodHandle mh (THREAD, Universe::finalizer_register_method());
   JavaCalls::call(&result, mh, &args, CHECK_NULL);
   return h_i();
 }
 instanceOop InstanceKlass::allocate_instance(TRAPS) {
   bool has_finalizer_flag = has_finalizer(); // Query before possible GC
   int size = size_helper();  // Query before forming handle.
   KlassHandle h_k(THREAD, this);
   instanceOop i;
   i = (instanceOop)CollectedHeap::obj_allocate(h_k, size, CHECK_NULL);
   if (has_finalizer_flag && !RegisterFinalizersAtInit) {
     i = register_finalizer(i, CHECK_NULL);
   }
   return i;
 }
 void InstanceKlass::check_valid_for_instantiation(bool throwError, TRAPS) {
   if (is_interface() || is_abstract()) {
     ResourceMark rm(THREAD);
     THROW_MSG(throwError ? vmSymbols::java_lang_InstantiationError()
               : vmSymbols::java_lang_InstantiationException(), external_name());
   }
   if (this == SystemDictionary::Class_klass()) {
     ResourceMark rm(THREAD);
     THROW_MSG(throwError ? vmSymbols::java_lang_IllegalAccessError()
               : vmSymbols::java_lang_IllegalAccessException(), external_name());
   }
 }
 Klass* InstanceKlass::array_klass_impl(bool or_null, int n, TRAPS) {
   instanceKlassHandle this_oop(THREAD, this);
   return array_klass_impl(this_oop, or_null, n, THREAD);
 }
 Klass* InstanceKlass::array_klass_impl(instanceKlassHandle this_oop, bool or_null, int n, TRAPS) {
   if (this_oop->array_klasses() == NULL) {
     if (or_null) return NULL;
     ResourceMark rm;
     JavaThread *jt = (JavaThread *)THREAD;
     {
       // Atomic creation of array_klasses
       MutexLocker mc(Compile_lock, THREAD);   // for vtables
       MutexLocker ma(MultiArray_lock, THREAD);
       // Check if update has already taken place
       if (this_oop->array_klasses() == NULL) {
         Klass*    k = ObjArrayKlass::allocate_objArray_klass(this_oop->class_loader_data(), 1, this_oop, CHECK_NULL);
         this_oop->set_array_klasses(k);
       }
     }
   }
   // _this will always be set at this point
   ObjArrayKlass* oak = (ObjArrayKlass*)this_oop->array_klasses();
   if (or_null) {
     return oak->array_klass_or_null(n);
   }
   return oak->array_klass(n, CHECK_NULL);
 }
 Klass* InstanceKlass::array_klass_impl(bool or_null, TRAPS) {
   return array_klass_impl(or_null, 1, THREAD);
 }
 void InstanceKlass::call_class_initializer(TRAPS) {
   instanceKlassHandle ik (THREAD, this);
   call_class_initializer_impl(ik, THREAD);
 }
 static int call_class_initializer_impl_counter = 0;   // for debugging
 Method* InstanceKlass::class_initializer() {
   Method* clinit = find_method(
       vmSymbols::class_initializer_name(), vmSymbols::void_method_signature());
   if (clinit != NULL && clinit->has_valid_initializer_flags()) {
     return clinit;
   }
   return NULL;
 }
 void InstanceKlass::call_class_initializer_impl(instanceKlassHandle this_oop, TRAPS) {
   if (ReplayCompiles &&
       (ReplaySuppressInitializers == 1 ||
        ReplaySuppressInitializers >= 2 && this_oop->class_loader() != NULL)) {
     // Hide the existence of the initializer for the purpose of replaying the compile
     return;
   }
   methodHandle h_method(THREAD, this_oop->class_initializer());
   assert(!this_oop->is_initialized(), "we cannot initialize twice");
   if (TraceClassInitialization) {
     tty->print("%d Initializing ", call_class_initializer_impl_counter++);
     this_oop->name()->print_value();
     tty->print_cr("%s (" INTPTR_FORMAT ")", h_method() == NULL ? "(no method)" : "", (address)this_oop());
   }
   if (h_method() != NULL) {
     JavaCallArguments args; // No arguments
     JavaValue result(T_VOID);
     JavaCalls::call(&result, h_method, &args, CHECK); // Static call (no args)
   }
 }
 void InstanceKlass::mask_for(methodHandle method, int bci,
   InterpreterOopMap* entry_for) {
   // Dirty read, then double-check under a lock.
   if (_oop_map_cache == NULL) {
     // Otherwise, allocate a new one.
     MutexLocker x(OopMapCacheAlloc_lock);
     // First time use. Allocate a cache in C heap
     if (_oop_map_cache == NULL) {
       // Release stores from OopMapCache constructor before assignment
       // to _oop_map_cache. C++ compilers on ppc do not emit the
       // required memory barrier only because of the volatile
       // qualifier of _oop_map_cache.
       OrderAccess::release_store_ptr(&_oop_map_cache, new OopMapCache());
     }
   }
   // _oop_map_cache is constant after init; lookup below does is own locking.
   _oop_map_cache->lookup(method, bci, entry_for);
 }
 bool InstanceKlass::find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
   for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
     Symbol* f_name = fs.name();
     Symbol* f_sig  = fs.signature();
     if (f_name == name && f_sig == sig) {
       fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index());
       return true;
     }
   }
   return false;
 }
 Klass* InstanceKlass::find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
   const int n = local_interfaces()->length();
   for (int i = 0; i < n; i++) {
     Klass* intf1 = local_interfaces()->at(i);
     assert(intf1->is_interface(), "just checking type");
     // search for field in current interface
     if (InstanceKlass::cast(intf1)->find_local_field(name, sig, fd)) {
       assert(fd->is_static(), "interface field must be static");
       return intf1;
     }
     // search for field in direct superinterfaces
     Klass* intf2 = InstanceKlass::cast(intf1)->find_interface_field(name, sig, fd);
     if (intf2 != NULL) return intf2;
   }
   // otherwise field lookup fails
   return NULL;
 }
 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
   // search order according to newest JVM spec (5.4.3.2, p.167).
   // 1) search for field in current klass
   if (find_local_field(name, sig, fd)) {
     return const_cast<InstanceKlass*>(this);
   }
   // 2) search for field recursively in direct superinterfaces
   { Klass* intf = find_interface_field(name, sig, fd);
     if (intf != NULL) return intf;
   }
   // 3) apply field lookup recursively if superclass exists
   { Klass* supr = super();
     if (supr != NULL) return InstanceKlass::cast(supr)->find_field(name, sig, fd);
   }
   // 4) otherwise field lookup fails
   return NULL;
 }
 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const {
   // search order according to newest JVM spec (5.4.3.2, p.167).
   // 1) search for field in current klass
   if (find_local_field(name, sig, fd)) {
     if (fd->is_static() == is_static) return const_cast<InstanceKlass*>(this);
   }
   // 2) search for field recursively in direct superinterfaces
   if (is_static) {
     Klass* intf = find_interface_field(name, sig, fd);
     if (intf != NULL) return intf;
   }
   // 3) apply field lookup recursively if superclass exists
   { Klass* supr = super();
     if (supr != NULL) return InstanceKlass::cast(supr)->find_field(name, sig, is_static, fd);
   }
   // 4) otherwise field lookup fails
   return NULL;
 }
 bool InstanceKlass::find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
   for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
     if (fs.offset() == offset) {
       fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index());
       if (fd->is_static() == is_static) return true;
     }
   }
   return false;
 }
 bool InstanceKlass::find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
   Klass* klass = const_cast<InstanceKlass*>(this);
   while (klass != NULL) {
     if (InstanceKlass::cast(klass)->find_local_field_from_offset(offset, is_static, fd)) {
       return true;
     }
     klass = klass->super();
   }
   return false;
 }
 void InstanceKlass::methods_do(void f(Method* method)) {
   int len = methods()->length();
   for (int index = 0; index < len; index++) {
     Method* m = methods()->at(index);
     assert(m->is_method(), "must be method");
     f(m);
   }
 }
 void InstanceKlass::do_local_static_fields(FieldClosure* cl) {
   for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
     if (fs.access_flags().is_static()) {
       fieldDescriptor& fd = fs.field_descriptor();
       cl->do_field(&fd);
     }
   }
 }
 void InstanceKlass::do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle mirror, TRAPS) {
   instanceKlassHandle h_this(THREAD, this);
   do_local_static_fields_impl(h_this, f, mirror, CHECK);
 }
 void InstanceKlass::do_local_static_fields_impl(instanceKlassHandle this_k,
                              void f(fieldDescriptor* fd, Handle mirror, TRAPS), Handle mirror, TRAPS) {
   for (JavaFieldStream fs(this_k()); !fs.done(); fs.next()) {
     if (fs.access_flags().is_static()) {
       fieldDescriptor& fd = fs.field_descriptor();
       f(&fd, mirror, CHECK);
     }
   }
 }
 static int compare_fields_by_offset(int* a, int* b) {
   return a[0] - b[0];
 }
 void InstanceKlass::do_nonstatic_fields(FieldClosure* cl) {
   InstanceKlass* super = superklass();
   if (super != NULL) {
     super->do_nonstatic_fields(cl);
   }
   fieldDescriptor fd;
   int length = java_fields_count();
   // In DebugInfo nonstatic fields are sorted by offset.
   int* fields_sorted = NEW_C_HEAP_ARRAY(int, 2*(length+1), mtClass);
   int j = 0;
   for (int i = 0; i < length; i += 1) {
     fd.reinitialize(this, i);
     if (!fd.is_static()) {
       fields_sorted[j + 0] = fd.offset();
       fields_sorted[j + 1] = i;
       j += 2;
     }
   }
   if (j > 0) {
     length = j;
     // _sort_Fn is defined in growableArray.hpp.
     qsort(fields_sorted, length/2, 2*sizeof(int), (_sort_Fn)compare_fields_by_offset);
     for (int i = 0; i < length; i += 2) {
       fd.reinitialize(this, fields_sorted[i + 1]);
       assert(!fd.is_static() && fd.offset() == fields_sorted[i], "only nonstatic fields");
       cl->do_field(&fd);
     }
   }
   FREE_C_HEAP_ARRAY(int, fields_sorted, mtClass);
 }
 void InstanceKlass::array_klasses_do(void f(Klass* k, TRAPS), TRAPS) {
   if (array_klasses() != NULL)
     ArrayKlass::cast(array_klasses())->array_klasses_do(f, THREAD);
 }
 void InstanceKlass::array_klasses_do(void f(Klass* k)) {
   if (array_klasses() != NULL)
     ArrayKlass::cast(array_klasses())->array_klasses_do(f);
 }
 #ifdef ASSERT
 static int linear_search(Array<Method*>* methods, Symbol* name, Symbol* signature) {
   int len = methods->length();
   for (int index = 0; index < len; index++) {
     Method* m = methods->at(index);
     assert(m->is_method(), "must be method");
     if (m->signature() == signature && m->name() == name) {
        return index;
     }
   }
   return -1;
 }
 #endif
 static int binary_search(Array<Method*>* methods, Symbol* name) {
   int len = methods->length();
   // methods are sorted, so do binary search
   int l = 0;
   int h = len - 1;
   while (l <= h) {
     int mid = (l + h) >> 1;
     Method* m = methods->at(mid);
     assert(m->is_method(), "must be method");
     int res = m->name()->fast_compare(name);
     if (res == 0) {
       return mid;
     } else if (res < 0) {
       l = mid + 1;
     } else {
       h = mid - 1;
     }
   }
   return -1;
 }
 // find_method looks up the name/signature in the local methods array
 Method* InstanceKlass::find_method(Symbol* name, Symbol* signature) const {
   return find_method_impl(name, signature, false);
 }
 Method* InstanceKlass::find_method_impl(Symbol* name, Symbol* signature, bool skipping_overpass) const {
   return InstanceKlass::find_method_impl(methods(), name, signature, skipping_overpass);
 }
 // find_instance_method looks up the name/signature in the local methods array
 // and skips over static methods
 Method* InstanceKlass::find_instance_method(
     Array<Method*>* methods, Symbol* name, Symbol* signature) {
   Method* meth = InstanceKlass::find_method(methods, name, signature);
   if (meth != NULL && meth->is_static()) {
       meth = NULL;
   }
   return meth;
 }
 // find_method looks up the name/signature in the local methods array
 Method* InstanceKlass::find_method(
     Array<Method*>* methods, Symbol* name, Symbol* signature) {
   return InstanceKlass::find_method_impl(methods, name, signature, false);
 }
 Method* InstanceKlass::find_method_impl(
     Array<Method*>* methods, Symbol* name, Symbol* signature, bool skipping_overpass) {
   int hit = find_method_index(methods, name, signature, skipping_overpass);
   return hit >= 0 ? methods->at(hit): NULL;
 }
 // Used directly for default_methods to find the index into the
 // default_vtable_indices, and indirectly by find_method
 // find_method_index looks in the local methods array to return the index
 // of the matching name/signature. If, overpass methods are being ignored,
 // the search continues to find a potential non-overpass match.  This capability
 // is important during method resolution to prefer a static method, for example,
 // over an overpass method.
 int InstanceKlass::find_method_index(
     Array<Method*>* methods, Symbol* name, Symbol* signature, bool skipping_overpass) {
   int hit = binary_search(methods, name);
   if (hit != -1) {
     Method* m = methods->at(hit);
     // Do linear search to find matching signature.  First, quick check
     // for common case, ignoring overpasses if requested.
     if ((m->signature() == signature) && (!skipping_overpass || !m->is_overpass())) return hit;
     // search downwards through overloaded methods
     int i;
     for (i = hit - 1; i >= 0; --i) {
         Method* m = methods->at(i);
         assert(m->is_method(), "must be method");
         if (m->name() != name) break;
         if ((m->signature() == signature) && (!skipping_overpass || !m->is_overpass())) return i;
     }
     // search upwards
     for (i = hit + 1; i < methods->length(); ++i) {
         Method* m = methods->at(i);
         assert(m->is_method(), "must be method");
         if (m->name() != name) break;
         if ((m->signature() == signature) && (!skipping_overpass || !m->is_overpass())) return i;
     }
     // not found
 #ifdef ASSERT
     int index = skipping_overpass ? -1 : linear_search(methods, name, signature);
     assert(index == -1, err_msg("binary search should have found entry %d", index));
 #endif
   }
   return -1;
 }
 int InstanceKlass::find_method_by_name(Symbol* name, int* end) {
   return find_method_by_name(methods(), name, end);
 }
 int InstanceKlass::find_method_by_name(
     Array<Method*>* methods, Symbol* name, int* end_ptr) {
   assert(end_ptr != NULL, "just checking");
   int start = binary_search(methods, name);
   int end = start + 1;
   if (start != -1) {
     while (start - 1 >= 0 && (methods->at(start - 1))->name() == name) --start;
     while (end < methods->length() && (methods->at(end))->name() == name) ++end;
     *end_ptr = end;
     return start;
   }
   return -1;
 }
 // uncached_lookup_method searches both the local class methods array and all
 // superclasses methods arrays, skipping any overpass methods in superclasses.
 Method* InstanceKlass::uncached_lookup_method(Symbol* name, Symbol* signature, MethodLookupMode mode) const {
   MethodLookupMode lookup_mode = mode;
   Klass* klass = const_cast<InstanceKlass*>(this);
   while (klass != NULL) {
     Method* method = InstanceKlass::cast(klass)->find_method_impl(name, signature, (lookup_mode == skip_overpass));
     if (method != NULL) {
       return method;
     }
     klass = InstanceKlass::cast(klass)->super();
     lookup_mode = skip_overpass;   // Always ignore overpass methods in superclasses
   }
   return NULL;
 }
 // lookup a method in the default methods list then in all transitive interfaces
 // Do NOT return private or static methods
 Method* InstanceKlass::lookup_method_in_ordered_interfaces(Symbol* name,
                                                          Symbol* signature) const {
   Method* m = NULL;
   if (default_methods() != NULL) {
     m = find_method(default_methods(), name, signature);
   }
   // Look up interfaces
   if (m == NULL) {
     m = lookup_method_in_all_interfaces(name, signature, normal);
   }
   return m;
 }
 // lookup a method in all the interfaces that this class implements
 // Do NOT return private or static methods, new in JDK8 which are not externally visible
 // They should only be found in the initial InterfaceMethodRef
 Method* InstanceKlass::lookup_method_in_all_interfaces(Symbol* name,
                                                        Symbol* signature,
                                                        MethodLookupMode mode) const {
   Array<Klass*>* all_ifs = transitive_interfaces();
   int num_ifs = all_ifs->length();
   InstanceKlass *ik = NULL;
   for (int i = 0; i < num_ifs; i++) {
     ik = InstanceKlass::cast(all_ifs->at(i));
     Method* m = ik->lookup_method(name, signature);
     if (m != NULL && m->is_public() && !m->is_static() &&
         ((mode != skip_defaults) || !m->is_default_method())) {
       return m;
     }
   }
   return NULL;
 }
 /* jni_id_for_impl for jfieldIds only */
 JNIid* InstanceKlass::jni_id_for_impl(instanceKlassHandle this_oop, int offset) {
   MutexLocker ml(JfieldIdCreation_lock);
   // Retry lookup after we got the lock
   JNIid* probe = this_oop->jni_ids() == NULL ? NULL : this_oop->jni_ids()->find(offset);
   if (probe == NULL) {
     // Slow case, allocate new static field identifier
     probe = new JNIid(this_oop(), offset, this_oop->jni_ids());
     this_oop->set_jni_ids(probe);
   }
   return probe;
 }
 /* jni_id_for for jfieldIds only */
 JNIid* InstanceKlass::jni_id_for(int offset) {
   JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset);
   if (probe == NULL) {
     probe = jni_id_for_impl(this, offset);
   }
   return probe;
 }
 u2 InstanceKlass::enclosing_method_data(int offset) {
   Array<jushort>* inner_class_list = inner_classes();
   if (inner_class_list == NULL) {
     return 0;
   }
   int length = inner_class_list->length();
   if (length % inner_class_next_offset == 0) {
     return 0;
   } else {
     int index = length - enclosing_method_attribute_size;
     assert(offset < enclosing_method_attribute_size, "invalid offset");
     return inner_class_list->at(index + offset);
   }
 }
 void InstanceKlass::set_enclosing_method_indices(u2 class_index,
                                                  u2 method_index) {
   Array<jushort>* inner_class_list = inner_classes();
   assert (inner_class_list != NULL, "_inner_classes list is not set up");
   int length = inner_class_list->length();
   if (length % inner_class_next_offset == enclosing_method_attribute_size) {
     int index = length - enclosing_method_attribute_size;
     inner_class_list->at_put(
       index + enclosing_method_class_index_offset, class_index);
     inner_class_list->at_put(
       index + enclosing_method_method_index_offset, method_index);
   }
 }
 // Lookup or create a jmethodID.
 // This code is called by the VMThread and JavaThreads so the
 // locking has to be done very carefully to avoid deadlocks
 // and/or other cache consistency problems.
 //
 jmethodID InstanceKlass::get_jmethod_id(instanceKlassHandle ik_h, methodHandle method_h) {
   size_t idnum = (size_t)method_h->method_idnum();
   jmethodID* jmeths = ik_h->methods_jmethod_ids_acquire();
   size_t length = 0;
   jmethodID id = NULL;
   // We use a double-check locking idiom here because this cache is
   // performance sensitive. In the normal system, this cache only
   // transitions from NULL to non-NULL which is safe because we use
   // release_set_methods_jmethod_ids() to advertise the new cache.
   // A partially constructed cache should never be seen by a racing
   // thread. We also use release_store_ptr() to save a new jmethodID
   // in the cache so a partially constructed jmethodID should never be
   // seen either. Cache reads of existing jmethodIDs proceed without a
   // lock, but cache writes of a new jmethodID requires uniqueness and
   // creation of the cache itself requires no leaks so a lock is
   // generally acquired in those two cases.
   //
   // If the RedefineClasses() API has been used, then this cache can
   // grow and we'll have transitions from non-NULL to bigger non-NULL.
   // Cache creation requires no leaks and we require safety between all
   // cache accesses and freeing of the old cache so a lock is generally
   // acquired when the RedefineClasses() API has been used.
   if (jmeths != NULL) {
     // the cache already exists
     if (!ik_h->idnum_can_increment()) {
       // the cache can't grow so we can just get the current values
       get_jmethod_id_length_value(jmeths, idnum, &length, &id);
     } else {
       // cache can grow so we have to be more careful
       if (Threads::number_of_threads() == 0 ||
           SafepointSynchronize::is_at_safepoint()) {
         // we're single threaded or at a safepoint - no locking needed
         get_jmethod_id_length_value(jmeths, idnum, &length, &id);
       } else {
         MutexLocker ml(JmethodIdCreation_lock);
         get_jmethod_id_length_value(jmeths, idnum, &length, &id);
       }
     }
   }
   // implied else:
   // we need to allocate a cache so default length and id values are good
   if (jmeths == NULL ||   // no cache yet
       length <= idnum ||  // cache is too short
       id == NULL) {       // cache doesn't contain entry
     // This function can be called by the VMThread so we have to do all
     // things that might block on a safepoint before grabbing the lock.
     // Otherwise, we can deadlock with the VMThread or have a cache
     // consistency issue. These vars keep track of what we might have
     // to free after the lock is dropped.
     jmethodID  to_dealloc_id     = NULL;
     jmethodID* to_dealloc_jmeths = NULL;
     // may not allocate new_jmeths or use it if we allocate it
     jmethodID* new_jmeths = NULL;
     if (length <= idnum) {
       // allocate a new cache that might be used
       size_t size = MAX2(idnum+1, (size_t)ik_h->idnum_allocated_count());
       new_jmeths = NEW_C_HEAP_ARRAY(jmethodID, size+1, mtClass);
       memset(new_jmeths, 0, (size+1)*sizeof(jmethodID));
       // cache size is stored in element[0], other elements offset by one
       new_jmeths[0] = (jmethodID)size;
     }
     // allocate a new jmethodID that might be used
     jmethodID new_id = NULL;
     if (method_h->is_old() && !method_h->is_obsolete()) {
       // The method passed in is old (but not obsolete), we need to use the current version
       Method* current_method = ik_h->method_with_idnum((int)idnum);
       assert(current_method != NULL, "old and but not obsolete, so should exist");
       new_id = Method::make_jmethod_id(ik_h->class_loader_data(), current_method);
     } else {
       // It is the current version of the method or an obsolete method,
       // use the version passed in
       new_id = Method::make_jmethod_id(ik_h->class_loader_data(), method_h());
     }
     if (Threads::number_of_threads() == 0 ||
         SafepointSynchronize::is_at_safepoint()) {
       // we're single threaded or at a safepoint - no locking needed
       id = get_jmethod_id_fetch_or_update(ik_h, idnum, new_id, new_jmeths,
                                           &to_dealloc_id, &to_dealloc_jmeths);
     } else {
       MutexLocker ml(JmethodIdCreation_lock);
       id = get_jmethod_id_fetch_or_update(ik_h, idnum, new_id, new_jmeths,
                                           &to_dealloc_id, &to_dealloc_jmeths);
     }
     // The lock has been dropped so we can free resources.
     // Free up either the old cache or the new cache if we allocated one.
     if (to_dealloc_jmeths != NULL) {
       FreeHeap(to_dealloc_jmeths);
     }
     // free up the new ID since it wasn't needed
     if (to_dealloc_id != NULL) {
       Method::destroy_jmethod_id(ik_h->class_loader_data(), to_dealloc_id);
     }
   }
   return id;
 }
 // Common code to fetch the jmethodID from the cache or update the
 // cache with the new jmethodID. This function should never do anything
 // that causes the caller to go to a safepoint or we can deadlock with
 // the VMThread or have cache consistency issues.
 //
 jmethodID InstanceKlass::get_jmethod_id_fetch_or_update(
             instanceKlassHandle ik_h, size_t idnum, jmethodID new_id,
             jmethodID* new_jmeths, jmethodID* to_dealloc_id_p,
             jmethodID** to_dealloc_jmeths_p) {
   assert(new_id != NULL, "sanity check");
   assert(to_dealloc_id_p != NULL, "sanity check");
   assert(to_dealloc_jmeths_p != NULL, "sanity check");
   assert(Threads::number_of_threads() == 0 ||
          SafepointSynchronize::is_at_safepoint() ||
          JmethodIdCreation_lock->owned_by_self(), "sanity check");
   // reacquire the cache - we are locked, single threaded or at a safepoint
   jmethodID* jmeths = ik_h->methods_jmethod_ids_acquire();
   jmethodID  id     = NULL;
   size_t     length = 0;
   if (jmeths == NULL ||                         // no cache yet
       (length = (size_t)jmeths[0]) <= idnum) {  // cache is too short
     if (jmeths != NULL) {
       // copy any existing entries from the old cache
       for (size_t index = 0; index < length; index++) {
         new_jmeths[index+1] = jmeths[index+1];
       }
       *to_dealloc_jmeths_p = jmeths;  // save old cache for later delete
     }
     ik_h->release_set_methods_jmethod_ids(jmeths = new_jmeths);
   } else {
     // fetch jmethodID (if any) from the existing cache
     id = jmeths[idnum+1];
     *to_dealloc_jmeths_p = new_jmeths;  // save new cache for later delete
   }
   if (id == NULL) {
     // No matching jmethodID in the existing cache or we have a new
     // cache or we just grew the cache. This cache write is done here
     // by the first thread to win the foot race because a jmethodID
     // needs to be unique once it is generally available.
     id = new_id;
     // The jmethodID cache can be read while unlocked so we have to
     // make sure the new jmethodID is complete before installing it
     // in the cache.
     OrderAccess::release_store_ptr(&jmeths[idnum+1], id);
   } else {
     *to_dealloc_id_p = new_id; // save new id for later delete
   }
   return id;
 }
 // Common code to get the jmethodID cache length and the jmethodID
 // value at index idnum if there is one.
 //
 void InstanceKlass::get_jmethod_id_length_value(jmethodID* cache,
        size_t idnum, size_t *length_p, jmethodID* id_p) {
   assert(cache != NULL, "sanity check");
   assert(length_p != NULL, "sanity check");
   assert(id_p != NULL, "sanity check");
   // cache size is stored in element[0], other elements offset by one
   *length_p = (size_t)cache[0];
   if (*length_p <= idnum) {  // cache is too short
     *id_p = NULL;
   } else {
     *id_p = cache[idnum+1];  // fetch jmethodID (if any)
   }
 }
 // Lookup a jmethodID, NULL if not found.  Do no blocking, no allocations, no handles
 jmethodID InstanceKlass::jmethod_id_or_null(Method* method) {
   size_t idnum = (size_t)method->method_idnum();
   jmethodID* jmeths = methods_jmethod_ids_acquire();
   size_t length;                                // length assigned as debugging crumb
   jmethodID id = NULL;
   if (jmeths != NULL &&                         // If there is a cache
       (length = (size_t)jmeths[0]) > idnum) {   // and if it is long enough,
     id = jmeths[idnum+1];                       // Look up the id (may be NULL)
   }
   return id;
 }
 int nmethodBucket::decrement() {
   return Atomic::add(-1, (volatile int *)&_count);
 }
 //
 // Walk the list of dependent nmethods searching for nmethods which
 // are dependent on the changes that were passed in and mark them for
 // deoptimization.  Returns the number of nmethods found.
 //
 int InstanceKlass::mark_dependent_nmethods(DepChange& changes) {
   assert_locked_or_safepoint(CodeCache_lock);
   int found = 0;
   nmethodBucket* b = _dependencies;
   while (b != NULL) {
     nmethod* nm = b->get_nmethod();
     // since dependencies aren't removed until an nmethod becomes a zombie,
     // the dependency list may contain nmethods which aren't alive.
     if (b->count() > 0 && nm->is_alive() && !nm->is_marked_for_deoptimization() && nm->check_dependency_on(changes)) {
       if (TraceDependencies) {
         ResourceMark rm;
         tty->print_cr("Marked for deoptimization");
         tty->print_cr("  context = %s", this->external_name());
         changes.print();
         nm->print();
         nm->print_dependencies();
       }
       nm->mark_for_deoptimization();
       found++;
     }
     b = b->next();
   }
   return found;
 }
 void InstanceKlass::clean_dependent_nmethods() {
   assert_locked_or_safepoint(CodeCache_lock);
   if (has_unloaded_dependent()) {
     nmethodBucket* b = _dependencies;
     nmethodBucket* last = NULL;
     while (b != NULL) {
       assert(b->count() >= 0, err_msg("bucket count: %d", b->count()));
       nmethodBucket* next = b->next();
       if (b->count() == 0) {
         if (last == NULL) {
           _dependencies = next;
         } else {
           last->set_next(next);
         }
         delete b;
         // last stays the same.
       } else {
         last = b;
       }
       b = next;
     }
     set_has_unloaded_dependent(false);
   }
 #ifdef ASSERT
   else {
     // Verification
     for (nmethodBucket* b = _dependencies; b != NULL; b = b->next()) {
       assert(b->count() >= 0, err_msg("bucket count: %d", b->count()));
       assert(b->count() != 0, "empty buckets need to be cleaned");
     }
   }
 #endif
 }
 //
 // Add an nmethodBucket to the list of dependencies for this nmethod.
 // It's possible that an nmethod has multiple dependencies on this klass
 // so a count is kept for each bucket to guarantee that creation and
 // deletion of dependencies is consistent.
 //
 void InstanceKlass::add_dependent_nmethod(nmethod* nm) {
   assert_locked_or_safepoint(CodeCache_lock);
   nmethodBucket* b = _dependencies;
   nmethodBucket* last = NULL;
   while (b != NULL) {
     if (nm == b->get_nmethod()) {
       b->increment();
       return;
     }
     b = b->next();
   }
   _dependencies = new nmethodBucket(nm, _dependencies);
 }
 //
 // Decrement count of the nmethod in the dependency list and remove
 // the bucket competely when the count goes to 0.  This method must
 // find a corresponding bucket otherwise there's a bug in the
 // recording of dependecies.
 //
 void InstanceKlass::remove_dependent_nmethod(nmethod* nm) {
   assert_locked_or_safepoint(CodeCache_lock);
   nmethodBucket* b = _dependencies;
   nmethodBucket* last = NULL;
   while (b != NULL) {
     if (nm == b->get_nmethod()) {
       int val = b->decrement();
       guarantee(val >= 0, err_msg("Underflow: %d", val));
       if (val == 0) {
         set_has_unloaded_dependent(true);
       }
       return;
     }
     last = b;
     b = b->next();
   }
 #ifdef ASSERT
   tty->print_cr("### %s can't find dependent nmethod:", this->external_name());
   nm->print();
 #endif // ASSERT
   ShouldNotReachHere();
 }
 #ifndef PRODUCT
 void InstanceKlass::print_dependent_nmethods(bool verbose) {
   nmethodBucket* b = _dependencies;
   int idx = 0;
   while (b != NULL) {
     nmethod* nm = b->get_nmethod();
     tty->print("[%d] count=%d { ", idx++, b->count());
     if (!verbose) {
       nm->print_on(tty, "nmethod");
       tty->print_cr(" } ");
     } else {
       nm->print();
       nm->print_dependencies();
       tty->print_cr("--- } ");
     }
     b = b->next();
   }
 }
 bool InstanceKlass::is_dependent_nmethod(nmethod* nm) {
   nmethodBucket* b = _dependencies;
   while (b != NULL) {
     if (nm == b->get_nmethod()) {
 #ifdef ASSERT
       int count = b->count();
       assert(count >= 0, err_msg("count shouldn't be negative: %d", count));
 #endif
       return true;
     }
     b = b->next();
   }
   return false;
 }
 #endif //PRODUCT
 // Garbage collection
 #ifdef ASSERT
 template <class T> void assert_is_in(T *p) {
   T heap_oop = oopDesc::load_heap_oop(p);
   if (!oopDesc::is_null(heap_oop)) {
     oop o = oopDesc::decode_heap_oop_not_null(heap_oop);
     assert(Universe::heap()->is_in(o), "should be in heap");
   }
 }
 template <class T> void assert_is_in_closed_subset(T *p) {
   T heap_oop = oopDesc::load_heap_oop(p);
   if (!oopDesc::is_null(heap_oop)) {
     oop o = oopDesc::decode_heap_oop_not_null(heap_oop);
     assert(Universe::heap()->is_in_closed_subset(o),
            err_msg("should be in closed *p " INTPTR_FORMAT " " INTPTR_FORMAT, (address)p, (address)o));
   }
 }
 template <class T> void assert_is_in_reserved(T *p) {
   T heap_oop = oopDesc::load_heap_oop(p);
   if (!oopDesc::is_null(heap_oop)) {
     oop o = oopDesc::decode_heap_oop_not_null(heap_oop);
     assert(Universe::heap()->is_in_reserved(o), "should be in reserved");
   }
 }
 template <class T> void assert_nothing(T *p) {}
 #else
 template <class T> void assert_is_in(T *p) {}
 template <class T> void assert_is_in_closed_subset(T *p) {}
 template <class T> void assert_is_in_reserved(T *p) {}
 template <class T> void assert_nothing(T *p) {}
 #endif // ASSERT
 //
 // Macros that iterate over areas of oops which are specialized on type of
 // oop pointer either narrow or wide, depending on UseCompressedOops
 //
 // Parameters are:
 //   T         - type of oop to point to (either oop or narrowOop)
 //   start_p   - starting pointer for region to iterate over
 //   count     - number of oops or narrowOops to iterate over
 //   do_oop    - action to perform on each oop (it's arbitrary C code which
 //               makes it more efficient to put in a macro rather than making
 //               it a template function)
 //   assert_fn - assert function which is template function because performance
 //               doesn't matter when enabled.
 #define InstanceKlass_SPECIALIZED_OOP_ITERATE( \
   T, start_p, count, do_oop,                \
   assert_fn)                                \
 {                                           \
   T* p         = (T*)(start_p);             \
   T* const end = p + (count);               \
   while (p < end) {                         \
     (assert_fn)(p);                         \
     do_oop;                                 \
     ++p;                                    \
   }                                         \
 }
 #define InstanceKlass_SPECIALIZED_OOP_REVERSE_ITERATE( \
   T, start_p, count, do_oop,                \
   assert_fn)                                \
 {                                           \
   T* const start = (T*)(start_p);           \
   T*       p     = start + (count);         \
   while (start < p) {                       \
     --p;                                    \
     (assert_fn)(p);                         \
     do_oop;                                 \
   }                                         \
 }
 #define InstanceKlass_SPECIALIZED_BOUNDED_OOP_ITERATE( \
   T, start_p, count, low, high,             \
   do_oop, assert_fn)                        \
 {                                           \
   T* const l = (T*)(low);                   \
   T* const h = (T*)(high);                  \
   assert(mask_bits((intptr_t)l, sizeof(T)-1) == 0 && \
          mask_bits((intptr_t)h, sizeof(T)-1) == 0,   \
          "bounded region must be properly aligned"); \
   T* p       = (T*)(start_p);               \
   T* end     = p + (count);                 \
   if (p < l) p = l;                         \
   if (end > h) end = h;                     \
   while (p < end) {                         \
     (assert_fn)(p);                         \
     do_oop;                                 \
     ++p;                                    \
   }                                         \
 }
 // The following macros call specialized macros, passing either oop or
 // narrowOop as the specialization type.  These test the UseCompressedOops
 // flag.
 #define InstanceKlass_OOP_MAP_ITERATE(obj, do_oop, assert_fn)            \
 {                                                                        \
   /* Compute oopmap block range. The common case                         \
      is nonstatic_oop_map_size == 1. */                                  \
   OopMapBlock* map           = start_of_nonstatic_oop_maps();            \
   OopMapBlock* const end_map = map + nonstatic_oop_map_count();          \
   if (UseCompressedOops) {                                               \
     while (map < end_map) {                                              \
       InstanceKlass_SPECIALIZED_OOP_ITERATE(narrowOop,                   \
         obj->obj_field_addr<narrowOop>(map->offset()), map->count(),     \
         do_oop, assert_fn)                                               \
       ++map;                                                             \
     }                                                                    \
   } else {                                                               \
     while (map < end_map) {                                              \
       InstanceKlass_SPECIALIZED_OOP_ITERATE(oop,                         \
         obj->obj_field_addr<oop>(map->offset()), map->count(),           \
         do_oop, assert_fn)                                               \
       ++map;                                                             \
     }                                                                    \
   }                                                                      \
 }
 #define InstanceKlass_OOP_MAP_REVERSE_ITERATE(obj, do_oop, assert_fn)    \
 {                                                                        \
   OopMapBlock* const start_map = start_of_nonstatic_oop_maps();          \
   OopMapBlock* map             = start_map + nonstatic_oop_map_count();  \
   if (UseCompressedOops) {                                               \
     while (start_map < map) {                                            \
       --map;                                                             \
       InstanceKlass_SPECIALIZED_OOP_REVERSE_ITERATE(narrowOop,           \
         obj->obj_field_addr<narrowOop>(map->offset()), map->count(),     \
         do_oop, assert_fn)                                               \
     }                                                                    \
   } else {                                                               \
     while (start_map < map) {                                            \
       --map;                                                             \
       InstanceKlass_SPECIALIZED_OOP_REVERSE_ITERATE(oop,                 \
         obj->obj_field_addr<oop>(map->offset()), map->count(),           \
         do_oop, assert_fn)                                               \
     }                                                                    \
   }                                                                      \
 }
 #define InstanceKlass_BOUNDED_OOP_MAP_ITERATE(obj, low, high, do_oop,    \
                                               assert_fn)                 \
 {                                                                        \
   /* Compute oopmap block range. The common case is                      \
      nonstatic_oop_map_size == 1, so we accept the                       \
      usually non-existent extra overhead of examining                    \
      all the maps. */                                                    \
   OopMapBlock* map           = start_of_nonstatic_oop_maps();            \
   OopMapBlock* const end_map = map + nonstatic_oop_map_count();          \
   if (UseCompressedOops) {                                               \
     while (map < end_map) {                                              \
       InstanceKlass_SPECIALIZED_BOUNDED_OOP_ITERATE(narrowOop,           \
         obj->obj_field_addr<narrowOop>(map->offset()), map->count(),     \
         low, high,                                                       \
         do_oop, assert_fn)                                               \
       ++map;                                                             \
     }                                                                    \
   } else {                                                               \
     while (map < end_map) {                                              \
       InstanceKlass_SPECIALIZED_BOUNDED_OOP_ITERATE(oop,                 \
         obj->obj_field_addr<oop>(map->offset()), map->count(),           \
         low, high,                                                       \
         do_oop, assert_fn)                                               \
       ++map;                                                             \
     }                                                                    \
   }                                                                      \
 }
 void InstanceKlass::oop_follow_contents(oop obj) {
   assert(obj != NULL, "can't follow the content of NULL object");
   MarkSweep::follow_klass(obj->klass());
   InstanceKlass_OOP_MAP_ITERATE( \
     obj, \
     MarkSweep::mark_and_push(p), \
     assert_is_in_closed_subset)
 }
 #if INCLUDE_ALL_GCS
 void InstanceKlass::oop_follow_contents(ParCompactionManager* cm,
                                         oop obj) {
   assert(obj != NULL, "can't follow the content of NULL object");
   PSParallelCompact::follow_klass(cm, obj->klass());
   // Only mark the header and let the scan of the meta-data mark
   // everything else.
   InstanceKlass_OOP_MAP_ITERATE( \
     obj, \
     PSParallelCompact::mark_and_push(cm, p), \
     assert_is_in)
 }
 #endif // INCLUDE_ALL_GCS
 // closure's do_metadata() method dictates whether the given closure should be
 // applied to the klass ptr in the object header.
 #define InstanceKlass_OOP_OOP_ITERATE_DEFN(OopClosureType, nv_suffix)        \
                                                                              \
 int InstanceKlass::oop_oop_iterate##nv_suffix(oop obj, OopClosureType* closure) { \
   SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::ik);\
   /* header */                                                          \
   if_do_metadata_checked(closure, nv_suffix) {                          \
     closure->do_klass##nv_suffix(obj->klass());                         \
   }                                                                     \
   InstanceKlass_OOP_MAP_ITERATE(                                        \
     obj,                                                                \
     SpecializationStats::                                               \
       record_do_oop_call##nv_suffix(SpecializationStats::ik);           \
     (closure)->do_oop##nv_suffix(p),                                    \
     assert_is_in_closed_subset)                                         \
   return size_helper();                                                 \
 }
 #if INCLUDE_ALL_GCS
 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN(OopClosureType, nv_suffix) \
                                                                                 \
 int InstanceKlass::oop_oop_iterate_backwards##nv_suffix(oop obj,                \
                                               OopClosureType* closure) {        \
   SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::ik); \
                                                                                 \
   assert_should_ignore_metadata(closure, nv_suffix);                            \
                                                                                 \
   /* instance variables */                                                      \
   InstanceKlass_OOP_MAP_REVERSE_ITERATE(                                        \
     obj,                                                                        \
     SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::ik);\
     (closure)->do_oop##nv_suffix(p),                                            \
     assert_is_in_closed_subset)                                                 \
    return size_helper();                                                        \
 }
 #endif // INCLUDE_ALL_GCS
 #define InstanceKlass_OOP_OOP_ITERATE_DEFN_m(OopClosureType, nv_suffix) \
                                                                         \
 int InstanceKlass::oop_oop_iterate##nv_suffix##_m(oop obj,              \
                                                   OopClosureType* closure, \
                                                   MemRegion mr) {          \
   SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::ik);\
   if_do_metadata_checked(closure, nv_suffix) {                           \
     if (mr.contains(obj)) {                                              \
       closure->do_klass##nv_suffix(obj->klass());                        \
     }                                                                    \
   }                                                                      \
   InstanceKlass_BOUNDED_OOP_MAP_ITERATE(                                 \
     obj, mr.start(), mr.end(),                                           \
     (closure)->do_oop##nv_suffix(p),                                     \
     assert_is_in_closed_subset)                                          \
   return size_helper();                                                  \
 }
 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DEFN)
 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DEFN)
 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DEFN_m)
 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DEFN_m)
 #if INCLUDE_ALL_GCS
 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN)
 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN)
 #endif // INCLUDE_ALL_GCS
 int InstanceKlass::oop_adjust_pointers(oop obj) {
   int size = size_helper();
   InstanceKlass_OOP_MAP_ITERATE( \
     obj, \
     MarkSweep::adjust_pointer(p), \
     assert_is_in)
   return size;
 }
 #if INCLUDE_ALL_GCS
 void InstanceKlass::oop_push_contents(PSPromotionManager* pm, oop obj) {
   InstanceKlass_OOP_MAP_REVERSE_ITERATE( \
     obj, \
     if (PSScavenge::should_scavenge(p)) { \
       pm->claim_or_forward_depth(p); \
     }, \
     assert_nothing )
 }
 int InstanceKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) {
   int size = size_helper();
   InstanceKlass_OOP_MAP_ITERATE( \
     obj, \
     PSParallelCompact::adjust_pointer(p), \
     assert_is_in)
   return size;
 }
 #endif // INCLUDE_ALL_GCS
 void InstanceKlass::clean_implementors_list(BoolObjectClosure* is_alive) {
   assert(class_loader_data()->is_alive(is_alive), "this klass should be live");
   if (is_interface()) {
     if (ClassUnloading) {
       Klass* impl = implementor();
       if (impl != NULL) {
         if (!impl->is_loader_alive(is_alive)) {
           // remove this guy
           Klass** klass = adr_implementor();
           assert(klass != NULL, "null klass");
           if (klass != NULL) {
             *klass = NULL;
           }
         }
       }
     }
   }
 }
 void InstanceKlass::clean_method_data(BoolObjectClosure* is_alive) {
   for (int m = 0; m < methods()->length(); m++) {
     MethodData* mdo = methods()->at(m)->method_data();
     if (mdo != NULL) {
       mdo->clean_method_data(is_alive);
     }
   }
 }
 static void remove_unshareable_in_class(Klass* k) {
   // remove klass's unshareable info
   k->remove_unshareable_info();
 }
 void InstanceKlass::remove_unshareable_info() {
   Klass::remove_unshareable_info();
   // Unlink the class
   if (is_linked()) {
     unlink_class();
   }
   init_implementor();
   constants()->remove_unshareable_info();
   for (int i = 0; i < methods()->length(); i++) {
     Method* m = methods()->at(i);
     m->remove_unshareable_info();
   }
   // do array classes also.
   array_klasses_do(remove_unshareable_in_class);
 }
 static void restore_unshareable_in_class(Klass* k, TRAPS) {
   // Array classes have null protection domain.
   // --> see ArrayKlass::complete_create_array_klass()
   k->restore_unshareable_info(ClassLoaderData::the_null_class_loader_data(), Handle(), CHECK);
 }
 void InstanceKlass::restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS) {
   Klass::restore_unshareable_info(loader_data, protection_domain, CHECK);
   instanceKlassHandle ik(THREAD, this);
   Array<Method*>* methods = ik->methods();
   int num_methods = methods->length();
   for (int index2 = 0; index2 < num_methods; ++index2) {
     methodHandle m(THREAD, methods->at(index2));
     m->restore_unshareable_info(CHECK);
   }
   if (JvmtiExport::has_redefined_a_class()) {
     // Reinitialize vtable because RedefineClasses may have changed some
     // entries in this vtable for super classes so the CDS vtable might
     // point to old or obsolete entries.  RedefineClasses doesn't fix up
     // vtables in the shared system dictionary, only the main one.
     // It also redefines the itable too so fix that too.
     ResourceMark rm(THREAD);
     ik->vtable()->initialize_vtable(false, CHECK);
     ik->itable()->initialize_itable(false, CHECK);
   }
   // restore constant pool resolved references
   ik->constants()->restore_unshareable_info(CHECK);
   ik->array_klasses_do(restore_unshareable_in_class, CHECK);
 }
 // returns true IFF is_in_error_state() has been changed as a result of this call.
 bool InstanceKlass::check_sharing_error_state() {
   assert(DumpSharedSpaces, "should only be called during dumping");
   bool old_state = is_in_error_state();
   if (!is_in_error_state()) {
     bool bad = false;
     for (InstanceKlass* sup = java_super(); sup; sup = sup->java_super()) {
       if (sup->is_in_error_state()) {
         bad = true;
         break;
       }
     }
     if (!bad) {
       Array<Klass*>* interfaces = transitive_interfaces();
       for (int i = 0; i < interfaces->length(); i++) {
         Klass* iface = interfaces->at(i);
         if (InstanceKlass::cast(iface)->is_in_error_state()) {
           bad = true;
           break;
         }
       }
     }
     if (bad) {
       set_in_error_state();
     }
   }
   return (old_state != is_in_error_state());
 }
 static void clear_all_breakpoints(Method* m) {
   m->clear_all_breakpoints();
 }
 void InstanceKlass::notify_unload_class(InstanceKlass* ik) {
   // notify the debugger
   if (JvmtiExport::should_post_class_unload()) {
     JvmtiExport::post_class_unload(ik);
   }
   // notify ClassLoadingService of class unload
   ClassLoadingService::notify_class_unloaded(ik);
 }
 void InstanceKlass::release_C_heap_structures(InstanceKlass* ik) {
   // Clean up C heap
   ik->release_C_heap_structures();
   ik->constants()->release_C_heap_structures();
 }
 void InstanceKlass::release_C_heap_structures() {
   // Can't release the constant pool here because the constant pool can be
   // deallocated separately from the InstanceKlass for default methods and
   // redefine classes.
   // Deallocate oop map cache
   if (_oop_map_cache != NULL) {
     delete _oop_map_cache;
     _oop_map_cache = NULL;
   }
   // Deallocate JNI identifiers for jfieldIDs
   JNIid::deallocate(jni_ids());
   set_jni_ids(NULL);
   jmethodID* jmeths = methods_jmethod_ids_acquire();
   if (jmeths != (jmethodID*)NULL) {
     release_set_methods_jmethod_ids(NULL);
     FreeHeap(jmeths);
   }
   // Deallocate MemberNameTable
   {
     Mutex* lock_or_null = SafepointSynchronize::is_at_safepoint() ? NULL : MemberNameTable_lock;
     MutexLockerEx ml(lock_or_null, Mutex::_no_safepoint_check_flag);
     MemberNameTable* mnt = member_names();
     if (mnt != NULL) {
       delete mnt;
       set_member_names(NULL);
     }
   }
   // release dependencies
   nmethodBucket* b = _dependencies;
   _dependencies = NULL;
   while (b != NULL) {
     nmethodBucket* next = b->next();
     delete b;
     b = next;
   }
   // Deallocate breakpoint records
   if (breakpoints() != 0x0) {
     methods_do(clear_all_breakpoints);
     assert(breakpoints() == 0x0, "should have cleared breakpoints");
   }
   // deallocate information about previous versions
   if (_previous_versions != NULL) {
     for (int i = _previous_versions->length() - 1; i >= 0; i--) {
       PreviousVersionNode * pv_node = _previous_versions->at(i);
       delete pv_node;
     }
     delete _previous_versions;
     _previous_versions = NULL;
   }
   // deallocate the cached class file
   if (_cached_class_file != NULL) {
     os::free(_cached_class_file, mtClass);
     _cached_class_file = NULL;
   }
   // Decrement symbol reference counts associated with the unloaded class.
   if (_name != NULL) _name->decrement_refcount();
   // unreference array name derived from this class name (arrays of an unloaded
   // class can't be referenced anymore).
   if (_array_name != NULL)  _array_name->decrement_refcount();
   if (_source_debug_extension != NULL) FREE_C_HEAP_ARRAY(char, _source_debug_extension, mtClass);
   assert(_total_instanceKlass_count >= 1, "Sanity check");
   Atomic::dec(&_total_instanceKlass_count);
 }
 void InstanceKlass::set_source_debug_extension(char* array, int length) {
   if (array == NULL) {
     _source_debug_extension = NULL;
   } else {
     // Adding one to the attribute length in order to store a null terminator
     // character could cause an overflow because the attribute length is
     // already coded with an u4 in the classfile, but in practice, it's
     // unlikely to happen.
     assert((length+1) > length, "Overflow checking");
     char* sde = NEW_C_HEAP_ARRAY(char, (length + 1), mtClass);
     for (int i = 0; i < length; i++) {
       sde[i] = array[i];
     }
     sde[length] = '\0';
     _source_debug_extension = sde;
   }
 }
 address InstanceKlass::static_field_addr(int offset) {
   return (address)(offset + InstanceMirrorKlass::offset_of_static_fields() + cast_from_oop<intptr_t>(java_mirror()));
 }
 const char* InstanceKlass::signature_name() const {
   int hash_len = 0;
   char hash_buf[40];
   // If this is an anonymous class, append a hash to make the name unique
   if (is_anonymous()) {
     assert(EnableInvokeDynamic, "EnableInvokeDynamic was not set.");
     intptr_t hash = (java_mirror() != NULL) ? java_mirror()->identity_hash() : 0;
     sprintf(hash_buf, "/" UINTX_FORMAT, (uintx)hash);
     hash_len = (int)strlen(hash_buf);
   }
   // Get the internal name as a c string
   const char* src = (const char*) (name()->as_C_string());
   const int src_length = (int)strlen(src);
   char* dest = NEW_RESOURCE_ARRAY(char, src_length + hash_len + 3);
   // Add L as type indicator
   int dest_index = 0;
   dest[dest_index++] = 'L';
   // Add the actual class name
   for (int src_index = 0; src_index < src_length; ) {
     dest[dest_index++] = src[src_index++];
   }
   // If we have a hash, append it
   for (int hash_index = 0; hash_index < hash_len; ) {
     dest[dest_index++] = hash_buf[hash_index++];
   }
   // Add the semicolon and the NULL
   dest[dest_index++] = ';';
   dest[dest_index] = '\0';
   return dest;
 }
 // different verisons of is_same_class_package
 bool InstanceKlass::is_same_class_package(Klass* class2) {
   Klass* class1 = this;
   oop classloader1 = InstanceKlass::cast(class1)->class_loader();
   Symbol* classname1 = class1->name();
   if (class2->oop_is_objArray()) {
     class2 = ObjArrayKlass::cast(class2)->bottom_klass();
   }
   oop classloader2;
   if (class2->oop_is_instance()) {
     classloader2 = InstanceKlass::cast(class2)->class_loader();
   } else {
     assert(class2->oop_is_typeArray(), "should be type array");
     classloader2 = NULL;
   }
   Symbol* classname2 = class2->name();
   return InstanceKlass::is_same_class_package(classloader1, classname1,
                                               classloader2, classname2);
 }
 bool InstanceKlass::is_same_class_package(oop classloader2, Symbol* classname2) {
   Klass* class1 = this;
   oop classloader1 = InstanceKlass::cast(class1)->class_loader();
   Symbol* classname1 = class1->name();
   return InstanceKlass::is_same_class_package(classloader1, classname1,
                                               classloader2, classname2);
 }
 // return true if two classes are in the same package, classloader
 // and classname information is enough to determine a class's package
 bool InstanceKlass::is_same_class_package(oop class_loader1, Symbol* class_name1,
                                           oop class_loader2, Symbol* class_name2) {
   if (class_loader1 != class_loader2) {
     return false;
   } else if (class_name1 == class_name2) {
     return true;                // skip painful bytewise comparison
   } else {
     ResourceMark rm;
     // The Symbol*'s are in UTF8 encoding. Since we only need to check explicitly
     // for ASCII characters ('/', 'L', '['), we can keep them in UTF8 encoding.
     // Otherwise, we just compare jbyte values between the strings.
     const jbyte *name1 = class_name1->base();
     const jbyte *name2 = class_name2->base();
     const jbyte *last_slash1 = UTF8::strrchr(name1, class_name1->utf8_length(), '/');
     const jbyte *last_slash2 = UTF8::strrchr(name2, class_name2->utf8_length(), '/');
     if ((last_slash1 == NULL) || (last_slash2 == NULL)) {
       // One of the two doesn't have a package.  Only return true
       // if the other one also doesn't have a package.
       return last_slash1 == last_slash2;
     } else {
       // Skip over '['s
       if (*name1 == '[') {
         do {
           name1++;
         } while (*name1 == '[');
         if (*name1 != 'L') {
           // Something is terribly wrong.  Shouldn't be here.
           return false;
         }
       }
       if (*name2 == '[') {
         do {
           name2++;
         } while (*name2 == '[');
         if (*name2 != 'L') {
           // Something is terribly wrong.  Shouldn't be here.
           return false;
         }
       }
       // Check that package part is identical
       int length1 = last_slash1 - name1;
       int length2 = last_slash2 - name2;
       return UTF8::equal(name1, length1, name2, length2);
     }
   }
 }
 // Returns true iff super_method can be overridden by a method in targetclassname
 // See JSL 3rd edition 8.4.6.1
 // Assumes name-signature match
 // "this" is InstanceKlass of super_method which must exist
 // note that the InstanceKlass of the method in the targetclassname has not always been created yet
 bool InstanceKlass::is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS) {
    // Private methods can not be overridden
    if (super_method->is_private()) {
      return false;
    }
    // If super method is accessible, then override
    if ((super_method->is_protected()) ||
        (super_method->is_public())) {
      return true;
    }
    // Package-private methods are not inherited outside of package
    assert(super_method->is_package_private(), "must be package private");
    return(is_same_class_package(targetclassloader(), targetclassname));
 }
 /* defined for now in jvm.cpp, for historical reasons *--
 Klass* InstanceKlass::compute_enclosing_class_impl(instanceKlassHandle self,
                                                      Symbol*& simple_name_result, TRAPS) {
   ...
 }
 */
 // tell if two classes have the same enclosing class (at package level)
 bool InstanceKlass::is_same_package_member_impl(instanceKlassHandle class1,
                                                 Klass* class2_oop, TRAPS) {
   if (class2_oop == class1())                       return true;
   if (!class2_oop->oop_is_instance())  return false;
   instanceKlassHandle class2(THREAD, class2_oop);
   // must be in same package before we try anything else
   if (!class1->is_same_class_package(class2->class_loader(), class2->name()))
     return false;
   // As long as there is an outer1.getEnclosingClass,
   // shift the search outward.
   instanceKlassHandle outer1 = class1;
   for (;;) {
     // As we walk along, look for equalities between outer1 and class2.
     // Eventually, the walks will terminate as outer1 stops
     // at the top-level class around the original class.
     bool ignore_inner_is_member;
     Klass* next = outer1->compute_enclosing_class(&ignore_inner_is_member,
                                                     CHECK_false);
     if (next == NULL)  break;
     if (next == class2())  return true;
     outer1 = instanceKlassHandle(THREAD, next);
   }
   // Now do the same for class2.
   instanceKlassHandle outer2 = class2;
   for (;;) {
     bool ignore_inner_is_member;
     Klass* next = outer2->compute_enclosing_class(&ignore_inner_is_member,
                                                     CHECK_false);
     if (next == NULL)  break;
     // Might as well check the new outer against all available values.
     if (next == class1())  return true;
     if (next == outer1())  return true;
     outer2 = instanceKlassHandle(THREAD, next);
   }
   // If by this point we have not found an equality between the
   // two classes, we know they are in separate package members.
   return false;
 }
 jint InstanceKlass::compute_modifier_flags(TRAPS) const {
   jint access = access_flags().as_int();
   // But check if it happens to be member class.
   instanceKlassHandle ik(THREAD, this);
   InnerClassesIterator iter(ik);
   for (; !iter.done(); iter.next()) {
     int ioff = iter.inner_class_info_index();
     // Inner class attribute can be zero, skip it.
     // Strange but true:  JVM spec. allows null inner class refs.
     if (ioff == 0) continue;
     // only look at classes that are already loaded
     // since we are looking for the flags for our self.
     Symbol* inner_name = ik->constants()->klass_name_at(ioff);
     if ((ik->name() == inner_name)) {
       // This is really a member class.
       access = iter.inner_access_flags();
       break;
     }
   }
   // Remember to strip ACC_SUPER bit
   return (access & (~JVM_ACC_SUPER)) & JVM_ACC_WRITTEN_FLAGS;
 }
 jint InstanceKlass::jvmti_class_status() const {
   jint result = 0;
   if (is_linked()) {
     result |= JVMTI_CLASS_STATUS_VERIFIED | JVMTI_CLASS_STATUS_PREPARED;
   }
   if (is_initialized()) {
     assert(is_linked(), "Class status is not consistent");
     result |= JVMTI_CLASS_STATUS_INITIALIZED;
   }
   if (is_in_error_state()) {
     result |= JVMTI_CLASS_STATUS_ERROR;
   }
   return result;
 }
 Method* InstanceKlass::method_at_itable(Klass* holder, int index, TRAPS) {
   itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable();
   int method_table_offset_in_words = ioe->offset()/wordSize;
   int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words())
                        / itableOffsetEntry::size();
   for (int cnt = 0 ; ; cnt ++, ioe ++) {
     // If the interface isn't implemented by the receiver class,
     // the VM should throw IncompatibleClassChangeError.
     if (cnt >= nof_interfaces) {
       THROW_NULL(vmSymbols::java_lang_IncompatibleClassChangeError());
     }
     Klass* ik = ioe->interface_klass();
     if (ik == holder) break;
   }
   itableMethodEntry* ime = ioe->first_method_entry(this);
   Method* m = ime[index].method();
   if (m == NULL) {
     THROW_NULL(vmSymbols::java_lang_AbstractMethodError());
   }
   return m;
 }
 #if INCLUDE_JVMTI
 // update default_methods for redefineclasses for methods that are
 // not yet in the vtable due to concurrent subclass define and superinterface
 // redefinition
 // Note: those in the vtable, should have been updated via adjust_method_entries
 void InstanceKlass::adjust_default_methods(Method** old_methods, Method** new_methods,
                                            int methods_length, bool* trace_name_printed) {
   // search the default_methods for uses of either obsolete or EMCP methods
   if (default_methods() != NULL) {
     for (int j = 0; j < methods_length; j++) {
       Method* old_method = old_methods[j];
       Method* new_method = new_methods[j];
       for (int index = 0; index < default_methods()->length(); index ++) {
         if (default_methods()->at(index) == old_method) {
           default_methods()->at_put(index, new_method);
           if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) {
             if (!(*trace_name_printed)) {
               // RC_TRACE_MESG macro has an embedded ResourceMark
               RC_TRACE_MESG(("adjust: klassname=%s default methods from name=%s",
                              external_name(),
                              old_method->method_holder()->external_name()));
               *trace_name_printed = true;
             }
             RC_TRACE(0x00100000, ("default method update: %s(%s) ",
                                   new_method->name()->as_C_string(),
                                   new_method->signature()->as_C_string()));
           }
         }
       }
     }
   }
 }
 #endif // INCLUDE_JVMTI
 // On-stack replacement stuff
 void InstanceKlass::add_osr_nmethod(nmethod* n) {
   // only one compilation can be active
   NEEDS_CLEANUP
   // This is a short non-blocking critical region, so the no safepoint check is ok.
   OsrList_lock->lock_without_safepoint_check();
   assert(n->is_osr_method(), "wrong kind of nmethod");
   n->set_osr_link(osr_nmethods_head());
   set_osr_nmethods_head(n);
   // Raise the highest osr level if necessary
   if (TieredCompilation) {
     Method* m = n->method();
     m->set_highest_osr_comp_level(MAX2(m->highest_osr_comp_level(), n->comp_level()));
   }
   // Remember to unlock again
   OsrList_lock->unlock();
   // Get rid of the osr methods for the same bci that have lower levels.
   if (TieredCompilation) {
     for (int l = CompLevel_limited_profile; l < n->comp_level(); l++) {
       nmethod *inv = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), l, true);
       if (inv != NULL && inv->is_in_use()) {
         inv->make_not_entrant();
       }
     }
   }
 }
 void InstanceKlass::remove_osr_nmethod(nmethod* n) {
   // This is a short non-blocking critical region, so the no safepoint check is ok.
   OsrList_lock->lock_without_safepoint_check();
   assert(n->is_osr_method(), "wrong kind of nmethod");
   nmethod* last = NULL;
   nmethod* cur  = osr_nmethods_head();
   int max_level = CompLevel_none;  // Find the max comp level excluding n
   Method* m = n->method();
   // Search for match
   while(cur != NULL && cur != n) {
     if (TieredCompilation && m == cur->method()) {
       // Find max level before n
       max_level = MAX2(max_level, cur->comp_level());
     }
     last = cur;
     cur = cur->osr_link();
   }
   nmethod* next = NULL;
   if (cur == n) {
     next = cur->osr_link();
     if (last == NULL) {
       // Remove first element
       set_osr_nmethods_head(next);
     } else {
       last->set_osr_link(next);
     }
   }
   n->set_osr_link(NULL);
   if (TieredCompilation) {
     cur = next;
     while (cur != NULL) {
       // Find max level after n
       if (m == cur->method()) {
         max_level = MAX2(max_level, cur->comp_level());
       }
       cur = cur->osr_link();
     }
     m->set_highest_osr_comp_level(max_level);
   }
   // Remember to unlock again
   OsrList_lock->unlock();
 }
 nmethod* InstanceKlass::lookup_osr_nmethod(const Method* m, int bci, int comp_level, bool match_level) const {
   // This is a short non-blocking critical region, so the no safepoint check is ok.
   OsrList_lock->lock_without_safepoint_check();
   nmethod* osr = osr_nmethods_head();
   nmethod* best = NULL;
   while (osr != NULL) {
     assert(osr->is_osr_method(), "wrong kind of nmethod found in chain");
     // There can be a time when a c1 osr method exists but we are waiting
     // for a c2 version. When c2 completes its osr nmethod we will trash
     // the c1 version and only be able to find the c2 version. However
     // while we overflow in the c1 code at back branches we don't want to
     // try and switch to the same code as we are already running
     if (osr->method() == m &&
         (bci == InvocationEntryBci || osr->osr_entry_bci() == bci)) {
       if (match_level) {
         if (osr->comp_level() == comp_level) {
           // Found a match - return it.
           OsrList_lock->unlock();
           return osr;
         }
       } else {
         if (best == NULL || (osr->comp_level() > best->comp_level())) {
           if (osr->comp_level() == CompLevel_highest_tier) {
             // Found the best possible - return it.
             OsrList_lock->unlock();
             return osr;
           }
           best = osr;
         }
       }
     }
     osr = osr->osr_link();
   }
   OsrList_lock->unlock();
   if (best != NULL && best->comp_level() >= comp_level && match_level == false) {
     return best;
   }
   return NULL;
 }
 void InstanceKlass::add_member_name(int index, Handle mem_name) {
   jweak mem_name_wref = JNIHandles::make_weak_global(mem_name);
   MutexLocker ml(MemberNameTable_lock);
   assert(0 <= index && index < idnum_allocated_count(), "index is out of bounds");
   DEBUG_ONLY(No_Safepoint_Verifier nsv);
   if (_member_names == NULL) {
     _member_names = new (ResourceObj::C_HEAP, mtClass) MemberNameTable(idnum_allocated_count());
   }
   _member_names->add_member_name(index, mem_name_wref);
 }
 oop InstanceKlass::get_member_name(int index) {
   MutexLocker ml(MemberNameTable_lock);
   assert(0 <= index && index < idnum_allocated_count(), "index is out of bounds");
   DEBUG_ONLY(No_Safepoint_Verifier nsv);
   if (_member_names == NULL) {
     return NULL;
   }
   oop mem_name =_member_names->get_member_name(index);
   return mem_name;
 }
 // -----------------------------------------------------------------------------------------------------
 // Printing
 #ifndef PRODUCT
 #define BULLET  " - "
 static const char* state_names[] = {
   "allocated", "loaded", "linked", "being_initialized", "fully_initialized", "initialization_error"
 };
 static void print_vtable(intptr_t* start, int len, outputStream* st) {
   for (int i = 0; i < len; i++) {
     intptr_t e = start[i];
     st->print("%d : " INTPTR_FORMAT, i, e);
     if (e != 0 && ((Metadata*)e)->is_metaspace_object()) {
       st->print(" ");
       ((Metadata*)e)->print_value_on(st);
     }
     st->cr();
   }
 }
 void InstanceKlass::print_on(outputStream* st) const {
   assert(is_klass(), "must be klass");
   Klass::print_on(st);
   st->print(BULLET"instance size:     %d", size_helper());                        st->cr();
   st->print(BULLET"klass size:        %d", size());                               st->cr();
   st->print(BULLET"access:            "); access_flags().print_on(st);            st->cr();
   st->print(BULLET"state:             "); st->print_cr("%s", state_names[_init_state]);
   st->print(BULLET"name:              "); name()->print_value_on(st);             st->cr();
   st->print(BULLET"super:             "); super()->print_value_on_maybe_null(st); st->cr();
   st->print(BULLET"sub:               ");
   Klass* sub = subklass();
   int n;
   for (n = 0; sub != NULL; n++, sub = sub->next_sibling()) {
     if (n < MaxSubklassPrintSize) {
       sub->print_value_on(st);
       st->print("   ");
     }
   }
   if (n >= MaxSubklassPrintSize) st->print("(%d more klasses...)", n - MaxSubklassPrintSize);
   st->cr();
   if (is_interface()) {
     st->print_cr(BULLET"nof implementors:  %d", nof_implementors());
     if (nof_implementors() == 1) {
       st->print_cr(BULLET"implementor:    ");
       st->print("   ");
       implementor()->print_value_on(st);
       st->cr();
     }
   }
   st->print(BULLET"arrays:            "); array_klasses()->print_value_on_maybe_null(st); st->cr();
   st->print(BULLET"methods:           "); methods()->print_value_on(st);                  st->cr();
   if (Verbose || WizardMode) {
     Array<Method*>* method_array = methods();
     for (int i = 0; i < method_array->length(); i++) {
       st->print("%d : ", i); method_array->at(i)->print_value(); st->cr();
     }
   }
   st->print(BULLET"method ordering:   "); method_ordering()->print_value_on(st);      st->cr();
   st->print(BULLET"default_methods:   "); default_methods()->print_value_on(st);      st->cr();
   if (Verbose && default_methods() != NULL) {
     Array<Method*>* method_array = default_methods();
     for (int i = 0; i < method_array->length(); i++) {
       st->print("%d : ", i); method_array->at(i)->print_value(); st->cr();
     }
   }
   if (default_vtable_indices() != NULL) {
     st->print(BULLET"default vtable indices:   "); default_vtable_indices()->print_value_on(st);       st->cr();
   }
   st->print(BULLET"local interfaces:  "); local_interfaces()->print_value_on(st);      st->cr();
   st->print(BULLET"trans. interfaces: "); transitive_interfaces()->print_value_on(st); st->cr();
   st->print(BULLET"constants:         "); constants()->print_value_on(st);         st->cr();
   if (class_loader_data() != NULL) {
     st->print(BULLET"class loader data:  ");
     class_loader_data()->print_value_on(st);
     st->cr();
   }
   st->print(BULLET"host class:        "); host_klass()->print_value_on_maybe_null(st); st->cr();
   if (source_file_name() != NULL) {
     st->print(BULLET"source file:       ");
     source_file_name()->print_value_on(st);
     st->cr();
   }
   if (source_debug_extension() != NULL) {
     st->print(BULLET"source debug extension:       ");
     st->print("%s", source_debug_extension());
     st->cr();
   }
   st->print(BULLET"class annotations:       "); class_annotations()->print_value_on(st); st->cr();
   st->print(BULLET"class type annotations:  "); class_type_annotations()->print_value_on(st); st->cr();
   st->print(BULLET"field annotations:       "); fields_annotations()->print_value_on(st); st->cr();
   st->print(BULLET"field type annotations:  "); fields_type_annotations()->print_value_on(st); st->cr();
   {
     bool have_pv = false;
     PreviousVersionWalker pvw(Thread::current(), (InstanceKlass*)this);
     for (PreviousVersionNode * pv_node = pvw.next_previous_version();
          pv_node != NULL; pv_node = pvw.next_previous_version()) {
       if (!have_pv)
         st->print(BULLET"previous version:  ");
       have_pv = true;
       pv_node->prev_constant_pool()->print_value_on(st);
     }
     if (have_pv) st->cr();
   } // pvw is cleaned up
   if (generic_signature() != NULL) {
     st->print(BULLET"generic signature: ");
     generic_signature()->print_value_on(st);
     st->cr();
   }
   st->print(BULLET"inner classes:     "); inner_classes()->print_value_on(st);     st->cr();
   st->print(BULLET"java mirror:       "); java_mirror()->print_value_on(st);       st->cr();
   st->print(BULLET"vtable length      %d  (start addr: " INTPTR_FORMAT ")", vtable_length(), start_of_vtable());  st->cr();
   if (vtable_length() > 0 && (Verbose || WizardMode))  print_vtable(start_of_vtable(), vtable_length(), st);
   st->print(BULLET"itable length      %d (start addr: " INTPTR_FORMAT ")", itable_length(), start_of_itable()); st->cr();
   if (itable_length() > 0 && (Verbose || WizardMode))  print_vtable(start_of_itable(), itable_length(), st);
   st->print_cr(BULLET"---- static fields (%d words):", static_field_size());
   FieldPrinter print_static_field(st);
   ((InstanceKlass*)this)->do_local_static_fields(&print_static_field);
   st->print_cr(BULLET"---- non-static fields (%d words):", nonstatic_field_size());
   FieldPrinter print_nonstatic_field(st);
   ((InstanceKlass*)this)->do_nonstatic_fields(&print_nonstatic_field);
   st->print(BULLET"non-static oop maps: ");
   OopMapBlock* map     = start_of_nonstatic_oop_maps();
   OopMapBlock* end_map = map + nonstatic_oop_map_count();
   while (map < end_map) {
     st->print("%d-%d ", map->offset(), map->offset() + heapOopSize*(map->count() - 1));
     map++;
   }
   st->cr();
 }
 #endif //PRODUCT
 void InstanceKlass::print_value_on(outputStream* st) const {
   assert(is_klass(), "must be klass");
   if (Verbose || WizardMode)  access_flags().print_on(st);
   name()->print_value_on(st);
 }
 #ifndef PRODUCT
 void FieldPrinter::do_field(fieldDescriptor* fd) {
   _st->print(BULLET);
    if (_obj == NULL) {
      fd->print_on(_st);
      _st->cr();
    } else {
      fd->print_on_for(_st, _obj);
      _st->cr();
    }
 }
 void InstanceKlass::oop_print_on(oop obj, outputStream* st) {
   Klass::oop_print_on(obj, st);
   if (this == SystemDictionary::String_klass()) {
     typeArrayOop value  = java_lang_String::value(obj);
     juint        offset = java_lang_String::offset(obj);
     juint        length = java_lang_String::length(obj);
     if (value != NULL &&
         value->is_typeArray() &&
         offset          <= (juint) value->length() &&
         offset + length <= (juint) value->length()) {
       st->print(BULLET"string: ");
       java_lang_String::print(obj, st);
       st->cr();
       if (!WizardMode)  return;  // that is enough
     }
   }
   st->print_cr(BULLET"---- fields (total size %d words):", oop_size(obj));
   FieldPrinter print_field(st, obj);
   do_nonstatic_fields(&print_field);
   if (this == SystemDictionary::Class_klass()) {
     st->print(BULLET"signature: ");
     java_lang_Class::print_signature(obj, st);
     st->cr();
     Klass* mirrored_klass = java_lang_Class::as_Klass(obj);
     st->print(BULLET"fake entry for mirror: ");
     mirrored_klass->print_value_on_maybe_null(st);
     st->cr();
     Klass* array_klass = java_lang_Class::array_klass(obj);
     st->print(BULLET"fake entry for array: ");
     array_klass->print_value_on_maybe_null(st);
     st->cr();
     st->print_cr(BULLET"fake entry for oop_size: %d", java_lang_Class::oop_size(obj));
     st->print_cr(BULLET"fake entry for static_oop_field_count: %d", java_lang_Class::static_oop_field_count(obj));
     Klass* real_klass = java_lang_Class::as_Klass(obj);
     if (real_klass != NULL && real_klass->oop_is_instance()) {
       InstanceKlass::cast(real_klass)->do_local_static_fields(&print_field);
     }
   } else if (this == SystemDictionary::MethodType_klass()) {
     st->print(BULLET"signature: ");
     java_lang_invoke_MethodType::print_signature(obj, st);
     st->cr();
   }
 }
 #endif //PRODUCT
 void InstanceKlass::oop_print_value_on(oop obj, outputStream* st) {
   st->print("a ");
   name()->print_value_on(st);
   obj->print_address_on(st);
   if (this == SystemDictionary::String_klass()
       && java_lang_String::value(obj) != NULL) {
     ResourceMark rm;
     int len = java_lang_String::length(obj);
     int plen = (len < 24 ? len : 12);
     char* str = java_lang_String::as_utf8_string(obj, 0, plen);
     st->print(" = \"%s\"", str);
     if (len > plen)
       st->print("...[%d]", len);
   } else if (this == SystemDictionary::Class_klass()) {
     Klass* k = java_lang_Class::as_Klass(obj);
     st->print(" = ");
     if (k != NULL) {
       k->print_value_on(st);
     } else {
       const char* tname = type2name(java_lang_Class::primitive_type(obj));
       st->print("%s", tname ? tname : "type?");
     }
   } else if (this == SystemDictionary::MethodType_klass()) {
     st->print(" = ");
     java_lang_invoke_MethodType::print_signature(obj, st);
   } else if (java_lang_boxing_object::is_instance(obj)) {
     st->print(" = ");
     java_lang_boxing_object::print(obj, st);
   } else if (this == SystemDictionary::LambdaForm_klass()) {
     oop vmentry = java_lang_invoke_LambdaForm::vmentry(obj);
     if (vmentry != NULL) {
       st->print(" => ");
       vmentry->print_value_on(st);
     }
   } else if (this == SystemDictionary::MemberName_klass()) {
     Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(obj);
     if (vmtarget != NULL) {
       st->print(" = ");
       vmtarget->print_value_on(st);
     } else {
       java_lang_invoke_MemberName::clazz(obj)->print_value_on(st);
       st->print(".");
       java_lang_invoke_MemberName::name(obj)->print_value_on(st);
     }
   }
 }
 const char* InstanceKlass::internal_name() const {
   return external_name();
 }
 #if INCLUDE_SERVICES
 // Size Statistics
 void InstanceKlass::collect_statistics(KlassSizeStats *sz) const {
   Klass::collect_statistics(sz);
   sz->_inst_size  = HeapWordSize * size_helper();
   sz->_vtab_bytes = HeapWordSize * align_object_offset(vtable_length());
   sz->_itab_bytes = HeapWordSize * align_object_offset(itable_length());
   sz->_nonstatic_oopmap_bytes = HeapWordSize *
         ((is_interface() || is_anonymous()) ?
          align_object_offset(nonstatic_oop_map_size()) :
          nonstatic_oop_map_size());
   int n = 0;
   n += (sz->_methods_array_bytes         = sz->count_array(methods()));
   n += (sz->_method_ordering_bytes       = sz->count_array(method_ordering()));
   n += (sz->_local_interfaces_bytes      = sz->count_array(local_interfaces()));
   n += (sz->_transitive_interfaces_bytes = sz->count_array(transitive_interfaces()));
   n += (sz->_fields_bytes                = sz->count_array(fields()));
   n += (sz->_inner_classes_bytes         = sz->count_array(inner_classes()));
   sz->_ro_bytes += n;
   const ConstantPool* cp = constants();
   if (cp) {
     cp->collect_statistics(sz);
   }
   const Annotations* anno = annotations();
   if (anno) {
     anno->collect_statistics(sz);
   }
   const Array<Method*>* methods_array = methods();
   if (methods()) {
     for (int i = 0; i < methods_array->length(); i++) {
       Method* method = methods_array->at(i);
       if (method) {
         sz->_method_count ++;
         method->collect_statistics(sz);
       }
     }
   }
 }
 #endif // INCLUDE_SERVICES
 // Verification
 class VerifyFieldClosure: public OopClosure {
  protected:
   template <class T> void do_oop_work(T* p) {
     oop obj = oopDesc::load_decode_heap_oop(p);
     if (!obj->is_oop_or_null()) {
       tty->print_cr("Failed: " PTR_FORMAT " -> " PTR_FORMAT, p, (address)obj);
       Universe::print();
       guarantee(false, "boom");
     }
   }
  public:
   virtual void do_oop(oop* p)       { VerifyFieldClosure::do_oop_work(p); }
   virtual void do_oop(narrowOop* p) { VerifyFieldClosure::do_oop_work(p); }
 };
 void InstanceKlass::verify_on(outputStream* st) {
 #ifndef PRODUCT
   // Avoid redundant verifies, this really should be in product.
   if (_verify_count == Universe::verify_count()) return;
   _verify_count = Universe::verify_count();
 #endif
   // Verify Klass
   Klass::verify_on(st);
   // Verify that klass is present in ClassLoaderData
   guarantee(class_loader_data()->contains_klass(this),
             "this class isn't found in class loader data");
   // Verify vtables
   if (is_linked()) {
     ResourceMark rm;
     // $$$ This used to be done only for m/s collections.  Doing it
     // always seemed a valid generalization.  (DLD -- 6/00)
     vtable()->verify(st);
   }
   // Verify first subklass
   if (subklass_oop() != NULL) {
     guarantee(subklass_oop()->is_klass(), "should be klass");
   }
   // Verify siblings
   Klass* super = this->super();
   Klass* sib = next_sibling();
   if (sib != NULL) {
     if (sib == this) {
       fatal(err_msg("subclass points to itself " PTR_FORMAT, sib));
     }
     guarantee(sib->is_klass(), "should be klass");
     guarantee(sib->super() == super, "siblings should have same superklass");
   }
   // Verify implementor fields
   Klass* im = implementor();
   if (im != NULL) {
     guarantee(is_interface(), "only interfaces should have implementor set");
     guarantee(im->is_klass(), "should be klass");
     guarantee(!im->is_interface() || im == this,
       "implementors cannot be interfaces");
   }
   // Verify local interfaces
   if (local_interfaces()) {
     Array<Klass*>* local_interfaces = this->local_interfaces();
     for (int j = 0; j < local_interfaces->length(); j++) {
       Klass* e = local_interfaces->at(j);
       guarantee(e->is_klass() && e->is_interface(), "invalid local interface");
     }
   }
   // Verify transitive interfaces
   if (transitive_interfaces() != NULL) {
     Array<Klass*>* transitive_interfaces = this->transitive_interfaces();
     for (int j = 0; j < transitive_interfaces->length(); j++) {
       Klass* e = transitive_interfaces->at(j);
       guarantee(e->is_klass() && e->is_interface(), "invalid transitive interface");
     }
   }
   // Verify methods
   if (methods() != NULL) {
     Array<Method*>* methods = this->methods();
     for (int j = 0; j < methods->length(); j++) {
       guarantee(methods->at(j)->is_method(), "non-method in methods array");
     }
     for (int j = 0; j < methods->length() - 1; j++) {
       Method* m1 = methods->at(j);
       Method* m2 = methods->at(j + 1);
       guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
     }
   }
   // Verify method ordering
   if (method_ordering() != NULL) {
     Array<int>* method_ordering = this->method_ordering();
     int length = method_ordering->length();
     if (JvmtiExport::can_maintain_original_method_order() ||
         ((UseSharedSpaces || DumpSharedSpaces) && length != 0)) {
       guarantee(length == methods()->length(), "invalid method ordering length");
       jlong sum = 0;
       for (int j = 0; j < length; j++) {
         int original_index = method_ordering->at(j);
         guarantee(original_index >= 0, "invalid method ordering index");
         guarantee(original_index < length, "invalid method ordering index");
         sum += original_index;
       }
       // Verify sum of indices 0,1,...,length-1
       guarantee(sum == ((jlong)length*(length-1))/2, "invalid method ordering sum");
     } else {
       guarantee(length == 0, "invalid method ordering length");
     }
   }
   // Verify default methods
   if (default_methods() != NULL) {
     Array<Method*>* methods = this->default_methods();
     for (int j = 0; j < methods->length(); j++) {
       guarantee(methods->at(j)->is_method(), "non-method in methods array");
     }
     for (int j = 0; j < methods->length() - 1; j++) {
       Method* m1 = methods->at(j);
       Method* m2 = methods->at(j + 1);
       guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
     }
   }
   // Verify JNI static field identifiers
   if (jni_ids() != NULL) {
     jni_ids()->verify(this);
   }
   // Verify other fields
   if (array_klasses() != NULL) {
     guarantee(array_klasses()->is_klass(), "should be klass");
   }
   if (constants() != NULL) {
     guarantee(constants()->is_constantPool(), "should be constant pool");
   }
   const Klass* host = host_klass();
   if (host != NULL) {
     guarantee(host->is_klass(), "should be klass");
   }
 }
 void InstanceKlass::oop_verify_on(oop obj, outputStream* st) {
   Klass::oop_verify_on(obj, st);
   VerifyFieldClosure blk;
   obj->oop_iterate_no_header(&blk);
 }
 // JNIid class for jfieldIDs only
 // Note to reviewers:
 // These JNI functions are just moved over to column 1 and not changed
 // in the compressed oops workspace.
 JNIid::JNIid(Klass* holder, int offset, JNIid* next) {
   _holder = holder;
   _offset = offset;
   _next = next;
   debug_only(_is_static_field_id = false;)
 }
 JNIid* JNIid::find(int offset) {
   JNIid* current = this;
   while (current != NULL) {
     if (current->offset() == offset) return current;
     current = current->next();
   }
   return NULL;
 }
 void JNIid::deallocate(JNIid* current) {
   while (current != NULL) {
     JNIid* next = current->next();
     delete current;
     current = next;
   }
 }
 void JNIid::verify(Klass* holder) {
   int first_field_offset  = InstanceMirrorKlass::offset_of_static_fields();
   int end_field_offset;
   end_field_offset = first_field_offset + (InstanceKlass::cast(holder)->static_field_size() * wordSize);
   JNIid* current = this;
   while (current != NULL) {
     guarantee(current->holder() == holder, "Invalid klass in JNIid");
 #ifdef ASSERT
     int o = current->offset();
     if (current->is_static_field_id()) {
       guarantee(o >= first_field_offset  && o < end_field_offset,  "Invalid static field offset in JNIid");
     }
 #endif
     current = current->next();
   }
 }
 #ifdef ASSERT
 void InstanceKlass::set_init_state(ClassState state) {
   bool good_state = is_shared() ? (_init_state <= state)
                                                : (_init_state < state);
   assert(good_state || state == allocated, "illegal state transition");
   _init_state = (u1)state;
 }
 #endif
 // RedefineClasses() support for previous versions:
 // Purge previous versions
 static void purge_previous_versions_internal(InstanceKlass* ik, int emcp_method_count) {
   if (ik->previous_versions() != NULL) {
     // This klass has previous versions so see what we can cleanup
     // while it is safe to do so.
     int deleted_count = 0;    // leave debugging breadcrumbs
     int live_count = 0;
     ClassLoaderData* loader_data = ik->class_loader_data() == NULL ?
                        ClassLoaderData::the_null_class_loader_data() :
                        ik->class_loader_data();
     // RC_TRACE macro has an embedded ResourceMark
     RC_TRACE(0x00000200, ("purge: %s: previous version length=%d",
       ik->external_name(), ik->previous_versions()->length()));
     for (int i = ik->previous_versions()->length() - 1; i >= 0; i--) {
       // check the previous versions array
       PreviousVersionNode * pv_node = ik->previous_versions()->at(i);
       ConstantPool* cp_ref = pv_node->prev_constant_pool();
       assert(cp_ref != NULL, "cp ref was unexpectedly cleared");
       ConstantPool* pvcp = cp_ref;
       if (!pvcp->on_stack()) {
         // If the constant pool isn't on stack, none of the methods
         // are executing.  Delete all the methods, the constant pool and
         // and this previous version node.
         GrowableArray<Method*>* method_refs = pv_node->prev_EMCP_methods();
         if (method_refs != NULL) {
           for (int j = method_refs->length() - 1; j >= 0; j--) {
             Method* method = method_refs->at(j);
             assert(method != NULL, "method ref was unexpectedly cleared");
             method_refs->remove_at(j);
             // method will be freed with associated class.
           }
         }
         // Remove the constant pool
         delete pv_node;
         // Since we are traversing the array backwards, we don't have to
         // do anything special with the index.
         ik->previous_versions()->remove_at(i);
         deleted_count++;
         continue;
       } else {
         RC_TRACE(0x00000200, ("purge: previous version @%d is alive", i));
         assert(pvcp->pool_holder() != NULL, "Constant pool with no holder");
         guarantee (!loader_data->is_unloading(), "unloaded classes can't be on the stack");
         live_count++;
       }
       // At least one method is live in this previous version, clean out
       // the others or mark them as obsolete.
       GrowableArray<Method*>* method_refs = pv_node->prev_EMCP_methods();
       if (method_refs != NULL) {
         RC_TRACE(0x00000200, ("purge: previous methods length=%d",
           method_refs->length()));
         for (int j = method_refs->length() - 1; j >= 0; j--) {
           Method* method = method_refs->at(j);
           assert(method != NULL, "method ref was unexpectedly cleared");
           // Remove the emcp method if it's not executing
           // If it's been made obsolete by a redefinition of a non-emcp
           // method, mark it as obsolete but leave it to clean up later.
           if (!method->on_stack()) {
             method_refs->remove_at(j);
           } else if (emcp_method_count == 0) {
             method->set_is_obsolete();
           } else {
             // RC_TRACE macro has an embedded ResourceMark
             RC_TRACE(0x00000200,
               ("purge: %s(%s): prev method @%d in version @%d is alive",
               method->name()->as_C_string(),
               method->signature()->as_C_string(), j, i));
           }
         }
       }
     }
     assert(ik->previous_versions()->length() == live_count, "sanity check");
     RC_TRACE(0x00000200,
       ("purge: previous version stats: live=%d, deleted=%d", live_count,
       deleted_count));
   }
 }
 // External interface for use during class unloading.
 void InstanceKlass::purge_previous_versions(InstanceKlass* ik) {
   // Call with >0 emcp methods since they are not currently being redefined.
   purge_previous_versions_internal(ik, 1);
 }
 // Potentially add an information node that contains pointers to the
 // interesting parts of the previous version of the_class.
 // This is also where we clean out any unused references.
 // Note that while we delete nodes from the _previous_versions
 // array, we never delete the array itself until the klass is
 // unloaded. The has_been_redefined() query depends on that fact.
 //
 void InstanceKlass::add_previous_version(instanceKlassHandle ikh,
        BitMap* emcp_methods, int emcp_method_count) {
   assert(Thread::current()->is_VM_thread(),
          "only VMThread can add previous versions");
   if (_previous_versions == NULL) {
     // This is the first previous version so make some space.
     // Start with 2 elements under the assumption that the class
     // won't be redefined much.
     _previous_versions =  new (ResourceObj::C_HEAP, mtClass)
                             GrowableArray<PreviousVersionNode *>(2, true);
   }
   ConstantPool* cp_ref = ikh->constants();
   // RC_TRACE macro has an embedded ResourceMark
   RC_TRACE(0x00000400, ("adding previous version ref for %s @%d, EMCP_cnt=%d "
                         "on_stack=%d",
     ikh->external_name(), _previous_versions->length(), emcp_method_count,
     cp_ref->on_stack()));
   // If the constant pool for this previous version of the class
   // is not marked as being on the stack, then none of the methods
   // in this previous version of the class are on the stack so
   // we don't need to create a new PreviousVersionNode. However,
   // we still need to examine older previous versions below.
   Array<Method*>* old_methods = ikh->methods();
   if (cp_ref->on_stack()) {
     PreviousVersionNode * pv_node = NULL;
     if (emcp_method_count == 0) {
       // non-shared ConstantPool gets a reference
       pv_node = new PreviousVersionNode(cp_ref, NULL);
       RC_TRACE(0x00000400,
           ("add: all methods are obsolete; flushing any EMCP refs"));
     } else {
       int local_count = 0;
       GrowableArray<Method*>* method_refs = new (ResourceObj::C_HEAP, mtClass)
           GrowableArray<Method*>(emcp_method_count, true);
       for (int i = 0; i < old_methods->length(); i++) {
         if (emcp_methods->at(i)) {
             // this old method is EMCP. Save it only if it's on the stack
             Method* old_method = old_methods->at(i);
             if (old_method->on_stack()) {
               method_refs->append(old_method);
             }
           if (++local_count >= emcp_method_count) {
             // no more EMCP methods so bail out now
             break;
           }
         }
       }
       // non-shared ConstantPool gets a reference
       pv_node = new PreviousVersionNode(cp_ref, method_refs);
     }
     // append new previous version.
     _previous_versions->append(pv_node);
   }
   // Since the caller is the VMThread and we are at a safepoint, this
   // is a good time to clear out unused references.
   RC_TRACE(0x00000400, ("add: previous version length=%d",
     _previous_versions->length()));
   // Purge previous versions not executing on the stack
   purge_previous_versions_internal(this, emcp_method_count);
   int obsolete_method_count = old_methods->length() - emcp_method_count;
   if (emcp_method_count != 0 && obsolete_method_count != 0 &&
       _previous_versions->length() > 0) {
     // We have a mix of obsolete and EMCP methods so we have to
     // clear out any matching EMCP method entries the hard way.
     int local_count = 0;
     for (int i = 0; i < old_methods->length(); i++) {
       if (!emcp_methods->at(i)) {
         // only obsolete methods are interesting
         Method* old_method = old_methods->at(i);
         Symbol* m_name = old_method->name();
         Symbol* m_signature = old_method->signature();
         // we might not have added the last entry
         for (int j = _previous_versions->length() - 1; j >= 0; j--) {
           // check the previous versions array for non executing obsolete methods
           PreviousVersionNode * pv_node = _previous_versions->at(j);
           GrowableArray<Method*>* method_refs = pv_node->prev_EMCP_methods();
           if (method_refs == NULL) {
             // We have run into a PreviousVersion generation where
             // all methods were made obsolete during that generation's
             // RedefineClasses() operation. At the time of that
             // operation, all EMCP methods were flushed so we don't
             // have to go back any further.
             //
             // A NULL method_refs is different than an empty method_refs.
             // We cannot infer any optimizations about older generations
             // from an empty method_refs for the current generation.
             break;
           }
           for (int k = method_refs->length() - 1; k >= 0; k--) {
             Method* method = method_refs->at(k);
             if (!method->is_obsolete() &&
                 method->name() == m_name &&
                 method->signature() == m_signature) {
               // The current RedefineClasses() call has made all EMCP
               // versions of this method obsolete so mark it as obsolete
               // and remove the reference.
               RC_TRACE(0x00000400,
                 ("add: %s(%s): flush obsolete method @%d in version @%d",
                 m_name->as_C_string(), m_signature->as_C_string(), k, j));
               method->set_is_obsolete();
               // Leave obsolete methods on the previous version list to
               // clean up later.
               break;
             }
           }
           // The previous loop may not find a matching EMCP method, but
           // that doesn't mean that we can optimize and not go any
           // further back in the PreviousVersion generations. The EMCP
           // method for this generation could have already been deleted,
           // but there still may be an older EMCP method that has not
           // been deleted.
         }
         if (++local_count >= obsolete_method_count) {
           // no more obsolete methods so bail out now
           break;
         }
       }
     }
   }
 } // end add_previous_version()
 // Determine if InstanceKlass has a previous version.
 bool InstanceKlass::has_previous_version() const {
   return (_previous_versions != NULL && _previous_versions->length() > 0);
 } // end has_previous_version()
 Method* InstanceKlass::method_with_idnum(int idnum) {
   Method* m = NULL;
   if (idnum < methods()->length()) {
     m = methods()->at(idnum);
   }
   if (m == NULL || m->method_idnum() != idnum) {
     for (int index = 0; index < methods()->length(); ++index) {
       m = methods()->at(index);
       if (m->method_idnum() == idnum) {
         return m;
       }
     }
     // None found, return null for the caller to handle.
     return NULL;
   }
   return m;
 }
 jint InstanceKlass::get_cached_class_file_len() {
   return VM_RedefineClasses::get_cached_class_file_len(_cached_class_file);
 }
 unsigned char * InstanceKlass::get_cached_class_file_bytes() {
   return VM_RedefineClasses::get_cached_class_file_bytes(_cached_class_file);
 }
 // Construct a PreviousVersionNode entry for the array hung off
 // the InstanceKlass.
 PreviousVersionNode::PreviousVersionNode(ConstantPool* prev_constant_pool,
   GrowableArray<Method*>* prev_EMCP_methods) {
   _prev_constant_pool = prev_constant_pool;
   _prev_EMCP_methods = prev_EMCP_methods;
 }
 // Destroy a PreviousVersionNode
 PreviousVersionNode::~PreviousVersionNode() {
   if (_prev_constant_pool != NULL) {
     _prev_constant_pool = NULL;
   }
   if (_prev_EMCP_methods != NULL) {
     delete _prev_EMCP_methods;
   }
 }
 // Construct a helper for walking the previous versions array
 PreviousVersionWalker::PreviousVersionWalker(Thread* thread, InstanceKlass *ik) {
   _thread = thread;
   _previous_versions = ik->previous_versions();
   _current_index = 0;
   _current_p = NULL;
   _current_constant_pool_handle = constantPoolHandle(thread, ik->constants());
 }
 // Return the interesting information for the next previous version
 // of the klass. Returns NULL if there are no more previous versions.
 PreviousVersionNode* PreviousVersionWalker::next_previous_version() {
   if (_previous_versions == NULL) {
     // no previous versions so nothing to return
     return NULL;
   }
   _current_p = NULL;  // reset to NULL
   _current_constant_pool_handle = NULL;
   int length = _previous_versions->length();
   while (_current_index < length) {
     PreviousVersionNode * pv_node = _previous_versions->at(_current_index++);
     // Save a handle to the constant pool for this previous version,
     // which keeps all the methods from being deallocated.
     _current_constant_pool_handle = constantPoolHandle(_thread, pv_node->prev_constant_pool());
     _current_p = pv_node;
     return pv_node;
   }
   return NULL;
 } // end next_previous_version()

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/oops/instanceKlass.cpp@7dca5ed0e13d (annotated)

src/share/vm/oops/instanceKlass.cpp