jdk-sandbox: comparison hotspot/src/share/vm/oops/instanceKlass.cpp

equal deleted inserted replaced

-:fd16c54261b3
+:489c9b5090e2
+/*
+* Copyright 1997-2007 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+* CA 95054 USA or visit www.sun.com if you need additional information or
+* have any questions.
+*
+*/
+# include "incls/_precompiled.incl"
+# include "incls/_instanceKlass.cpp.incl"
+bool instanceKlass::should_be_initialized() const {
+return !is_initialized();
+}
+klassVtable* instanceKlass::vtable() const {
+return new klassVtable(as_klassOop(), start_of_vtable(), vtable_length() / vtableEntry::size());
+}
+klassItable* instanceKlass::itable() const {
+return new klassItable(as_klassOop());
+}
+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)
+klassOop 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->as_klassOop());
+eager_initialize_impl(this_oop);
+}
+}
+void instanceKlass::eager_initialize_impl(instanceKlassHandle this_oop) {
+EXCEPTION_MARK;
+ObjectLocker ol(this_oop, THREAD);
+// 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);
+// 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->as_klassOop());
+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, 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()) {
+instanceKlassHandle this_oop(THREAD, this->as_klassOop());
+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()) {
+instanceKlassHandle this_oop(THREAD, this->as_klassOop());
+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;
+PerfTraceTimedEvent vmtimer(ClassLoader::perf_class_link_time(),
+ClassLoader::perf_classes_linked(),
+jt->get_thread_stat()->class_link_recursion_count_addr());
+// 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,
+vmSymbolHandles::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
+objArrayHandle interfaces (THREAD, this_oop->local_interfaces());
+int num_interfaces = interfaces->length();
+for (int index = 0; index < num_interfaces; index++) {
+HandleMark hm(THREAD);
+instanceKlassHandle ih(THREAD, klassOop(interfaces->obj_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;
+}
+// verification & rewriting
+{
+ObjectLocker ol(this_oop, THREAD);
+// 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()) {
+{
+assert(THREAD->is_Java_thread(), "non-JavaThread in link_class_impl");
+JavaThread* jt = (JavaThread*)THREAD;
+// Timer includes any side effects of class verification (resolution,
+// etc), but not recursive entry into verify_code().
+PerfTraceTime timer(ClassLoader::perf_class_verify_time(),
+jt->get_thread_stat()->class_verify_recursion_count_addr());
+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);
+}
+// Initialize the vtable and interface table after
+// methods have been rewritten since rewrite may
+// fabricate new methodOops.
+// 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.
+// Three cases:
+//    During the link of a newly loaded class.
+//    During the preloading of classes to be written to the shared spaces.
+//      - Rewrite the methods and update the method entry points.
+//
+//    During the link of a class in the shared spaces.
+//      - The methods were already rewritten, update the metho entry points.
+//
+// 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->as_klassOop());
+if (this_oop->is_rewritten()) {
+assert(this_oop()->is_shared(), "rewriting an unshared class?");
+return;
+}
+Rewriter::rewrite(this_oop, CHECK); // No exception can happen here
+this_oop->set_rewritten();
+}
+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);
+// refer to the JVM book page 47 for description of steps
+// Step 1
+{ ObjectLocker ol(this_oop, THREAD);
+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)) {
+ol.waitUninterruptibly(CHECK);
+}
+// Step 3
+if (this_oop->is_being_initialized() && this_oop->is_reentrant_initialization(self))
+return;
+// Step 4
+if (this_oop->is_initialized())
+return;
+// Step 5
+if (this_oop->is_in_error_state()) {
+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_C_HEAP_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
+klassOop super_klass = this_oop->super();
+if (super_klass != NULL && !this_oop->is_interface() && Klass::cast(super_klass)->should_be_initialized()) {
+Klass::cast(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
+}
+THROW_OOP(e());
+}
+}
+// Step 8
+{
+assert(THREAD->is_Java_thread(), "non-JavaThread in initialize_impl");
+JavaThread* jt = (JavaThread*)THREAD;
+// Timer includes any side effects of class initialization (resolution,
+// etc), but not recursive entry into call_class_initializer().
+PerfTraceTimedEvent timer(ClassLoader::perf_class_init_time(),
+ClassLoader::perf_classes_inited(),
+jt->get_thread_stat()->class_init_recursion_count_addr());
+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
+}
+if (e->is_a(SystemDictionary::error_klass())) {
+THROW_OOP(e());
+} else {
+JavaCallArguments args(e);
+THROW_ARG(vmSymbolHandles::java_lang_ExceptionInInitializerError(),
+vmSymbolHandles::throwable_void_signature(),
+&args);
+}
+}
+}
+// 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->as_klassOop());
+set_initialization_state_and_notify_impl(kh, state, CHECK);
+}
+void instanceKlass::set_initialization_state_and_notify_impl(instanceKlassHandle this_oop, ClassState state, TRAPS) {
+ObjectLocker ol(this_oop, THREAD);
+this_oop->set_init_state(state);
+ol.notify_all(CHECK);
+}
+void instanceKlass::add_implementor(klassOop k) {
+assert(Compile_lock->owned_by_self(), "");
+// 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.)
+klassOop sk = instanceKlass::cast(k)->super();
+if (sk != NULL && instanceKlass::cast(sk)->implements_interface(as_klassOop()))
+// 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;
+// Update number of implementors
+int i = _nof_implementors++;
+// Record this implementor, if there are not too many already
+if (i < implementors_limit) {
+assert(_implementors[i] == NULL, "should be exactly one implementor");
+oop_store_without_check((oop*)&_implementors[i], k);
+} else if (i == implementors_limit) {
+// clear out the list on first overflow
+for (int i2 = 0; i2 < implementors_limit; i2++)
+oop_store_without_check((oop*)&_implementors[i2], NULL);
+}
+// The implementor also implements the transitive_interfaces
+for (int index = 0; index < local_interfaces()->length(); index++) {
+instanceKlass::cast(klassOop(local_interfaces()->obj_at(index)))->add_implementor(k);
+}
+}
+void instanceKlass::init_implementor() {
+for (int i = 0; i < implementors_limit; i++)
+oop_store_without_check((oop*)&_implementors[i], NULL);
+_nof_implementors = 0;
+}
+void instanceKlass::process_interfaces(Thread *thread) {
+// link this class into the implementors list of every interface it implements
+KlassHandle this_as_oop (thread, this->as_klassOop());
+for (int i = local_interfaces()->length() - 1; i >= 0; i--) {
+assert(local_interfaces()->obj_at(i)->is_klass(), "must be a klass");
+instanceKlass* interf = instanceKlass::cast(klassOop(local_interfaces()->obj_at(i)));
+assert(interf->is_interface(), "expected interface");
+interf->add_implementor(this_as_oop());
+}
+}
+bool instanceKlass::can_be_primary_super_slow() const {
+if (is_interface())
+return false;
+else
+return Klass::can_be_primary_super_slow();
+}
+objArrayOop instanceKlass::compute_secondary_supers(int num_extra_slots, TRAPS) {
+// The secondaries are the implemented interfaces.
+instanceKlass* ik = instanceKlass::cast(as_klassOop());
+objArrayHandle interfaces (THREAD, ik->transitive_interfaces());
+int num_secondaries = num_extra_slots + interfaces->length();
+if (num_secondaries == 0) {
+return Universe::the_empty_system_obj_array();
+} else if (num_extra_slots == 0) {
+return interfaces();
+} else {
+// a mix of both
+objArrayOop secondaries = oopFactory::new_system_objArray(num_secondaries, CHECK_NULL);
+for (int i = 0; i < interfaces->length(); i++) {
+secondaries->obj_at_put(num_extra_slots+i, interfaces->obj_at(i));
+}
+return secondaries;
+}
+}
+bool instanceKlass::compute_is_subtype_of(klassOop k) {
+if (Klass::cast(k)->is_interface()) {
+return implements_interface(k);
+} else {
+return Klass::compute_is_subtype_of(k);
+}
+}
+bool instanceKlass::implements_interface(klassOop k) const {
+if (as_klassOop() == k) return true;
+assert(Klass::cast(k)->is_interface(), "should be an interface class");
+for (int i = 0; i < transitive_interfaces()->length(); i++) {
+if (transitive_interfaces()->obj_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)) {
+THROW_OOP_0(Universe::out_of_memory_error_array_size());
+}
+int size = objArrayOopDesc::object_size(length);
+klassOop 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, as_klassOop());
+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;
+}
+instanceOop instanceKlass::allocate_permanent_instance(TRAPS) {
+// Finalizer registration occurs in the Object.<init> constructor
+// and constructors normally aren't run when allocating perm
+// instances so simply disallow finalizable perm objects.  This can
+// be relaxed if a need for it is found.
+assert(!has_finalizer(), "perm objects not allowed to have finalizers");
+int size = size_helper();  // Query before forming handle.
+KlassHandle h_k(THREAD, as_klassOop());
+instanceOop i = (instanceOop)
+CollectedHeap::permanent_obj_allocate(h_k, size, 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 (as_klassOop() == SystemDictionary::class_klass()) {
+ResourceMark rm(THREAD);
+THROW_MSG(throwError ? vmSymbols::java_lang_IllegalAccessError()
+: vmSymbols::java_lang_IllegalAccessException(), external_name());
+}
+}
+klassOop instanceKlass::array_klass_impl(bool or_null, int n, TRAPS) {
+instanceKlassHandle this_oop(THREAD, as_klassOop());
+return array_klass_impl(this_oop, or_null, n, THREAD);
+}
+klassOop 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) {
+objArrayKlassKlass* oakk =
+(objArrayKlassKlass*)Universe::objArrayKlassKlassObj()->klass_part();
+klassOop  k = oakk->allocate_objArray_klass(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()->klass_part();
+if (or_null) {
+return oak->array_klass_or_null(n);
+}
+return oak->array_klass(n, CHECK_NULL);
+}
+klassOop 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, as_klassOop());
+call_class_initializer_impl(ik, THREAD);
+}
+static int call_class_initializer_impl_counter = 0;   // for debugging
+methodOop instanceKlass::class_initializer() {
+return find_method(vmSymbols::class_initializer_name(), vmSymbols::void_method_signature());
+}
+void instanceKlass::call_class_initializer_impl(instanceKlassHandle this_oop, TRAPS) {
+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) {
+_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(symbolOop name, symbolOop sig, fieldDescriptor* fd) const {
+const int n = fields()->length();
+for (int i = 0; i < n; i += next_offset ) {
+int name_index = fields()->ushort_at(i + name_index_offset);
+int sig_index  = fields()->ushort_at(i + signature_index_offset);
+symbolOop f_name = constants()->symbol_at(name_index);
+symbolOop f_sig  = constants()->symbol_at(sig_index);
+if (f_name == name && f_sig == sig) {
+fd->initialize(as_klassOop(), i);
+return true;
+}
+}
+return false;
+}
+void instanceKlass::field_names_and_sigs_iterate(OopClosure* closure) {
+const int n = fields()->length();
+for (int i = 0; i < n; i += next_offset ) {
+int name_index = fields()->ushort_at(i + name_index_offset);
+symbolOop name = constants()->symbol_at(name_index);
+closure->do_oop((oop*)&name);
+int sig_index  = fields()->ushort_at(i + signature_index_offset);
+symbolOop sig = constants()->symbol_at(sig_index);
+closure->do_oop((oop*)&sig);
+}
+}
+klassOop instanceKlass::find_interface_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const {
+const int n = local_interfaces()->length();
+for (int i = 0; i < n; i++) {
+klassOop intf1 = klassOop(local_interfaces()->obj_at(i));
+assert(Klass::cast(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
+klassOop intf2 = instanceKlass::cast(intf1)->find_interface_field(name, sig, fd);
+if (intf2 != NULL) return intf2;
+}
+// otherwise field lookup fails
+return NULL;
+}
+klassOop instanceKlass::find_field(symbolOop name, symbolOop 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 as_klassOop();
+}
+// 2) search for field recursively in direct superinterfaces
+{ klassOop intf = find_interface_field(name, sig, fd);
+if (intf != NULL) return intf;
+}
+// 3) apply field lookup recursively if superclass exists
+{ klassOop supr = super();
+if (supr != NULL) return instanceKlass::cast(supr)->find_field(name, sig, fd);
+}
+// 4) otherwise field lookup fails
+return NULL;
+}
+klassOop instanceKlass::find_field(symbolOop name, symbolOop 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 as_klassOop();
+}
+// 2) search for field recursively in direct superinterfaces
+if (is_static) {
+klassOop intf = find_interface_field(name, sig, fd);
+if (intf != NULL) return intf;
+}
+// 3) apply field lookup recursively if superclass exists
+{ klassOop 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 {
+int length = fields()->length();
+for (int i = 0; i < length; i += next_offset) {
+if (offset_from_fields( i ) == offset) {
+fd->initialize(as_klassOop(), i);
+if (fd->is_static() == is_static) return true;
+}
+}
+return false;
+}
+bool instanceKlass::find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
+klassOop klass = as_klassOop();
+while (klass != NULL) {
+if (instanceKlass::cast(klass)->find_local_field_from_offset(offset, is_static, fd)) {
+return true;
+}
+klass = Klass::cast(klass)->super();
+}
+return false;
+}
+void instanceKlass::methods_do(void f(methodOop method)) {
+int len = methods()->length();
+for (int index = 0; index < len; index++) {
+methodOop m = methodOop(methods()->obj_at(index));
+assert(m->is_method(), "must be method");
+f(m);
+}
+}
+void instanceKlass::do_local_static_fields(FieldClosure* cl) {
+fieldDescriptor fd;
+int length = fields()->length();
+for (int i = 0; i < length; i += next_offset) {
+fd.initialize(as_klassOop(), i);
+if (fd.is_static()) cl->do_field(&fd);
+}
+}
+void instanceKlass::do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS) {
+instanceKlassHandle h_this(THREAD, as_klassOop());
+do_local_static_fields_impl(h_this, f, CHECK);
+}
+void instanceKlass::do_local_static_fields_impl(instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS) {
+fieldDescriptor fd;
+int length = this_oop->fields()->length();
+for (int i = 0; i < length; i += next_offset) {
+fd.initialize(this_oop(), i);
+if (fd.is_static()) { f(&fd, CHECK); } // Do NOT remove {}! (CHECK macro expands into several statements)
+}
+}
+void instanceKlass::do_nonstatic_fields(FieldClosure* cl) {
+fieldDescriptor fd;
+instanceKlass* super = superklass();
+if (super != NULL) {
+super->do_nonstatic_fields(cl);
+}
+int length = fields()->length();
+for (int i = 0; i < length; i += next_offset) {
+fd.initialize(as_klassOop(), i);
+if (!(fd.is_static())) cl->do_field(&fd);
+}
+}
+void instanceKlass::array_klasses_do(void f(klassOop k)) {
+if (array_klasses() != NULL)
+arrayKlass::cast(array_klasses())->array_klasses_do(f);
+}
+void instanceKlass::with_array_klasses_do(void f(klassOop k)) {
+f(as_klassOop());
+array_klasses_do(f);
+}
+#ifdef ASSERT
+static int linear_search(objArrayOop methods, symbolOop name, symbolOop signature) {
+int len = methods->length();
+for (int index = 0; index < len; index++) {
+methodOop m = (methodOop)(methods->obj_at(index));
+assert(m->is_method(), "must be method");
+if (m->signature() == signature && m->name() == name) {
+return index;
+}
+}
+return -1;
+}
+#endif
+methodOop instanceKlass::find_method(symbolOop name, symbolOop signature) const {
+return instanceKlass::find_method(methods(), name, signature);
+}
+methodOop instanceKlass::find_method(objArrayOop methods, symbolOop name, symbolOop signature) {
+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;
+methodOop m = (methodOop)methods->obj_at(mid);
+assert(m->is_method(), "must be method");
+int res = m->name()->fast_compare(name);
+if (res == 0) {
+// found matching name; do linear search to find matching signature
+// first, quick check for common case
+if (m->signature() == signature) return m;
+// search downwards through overloaded methods
+int i;
+for (i = mid - 1; i >= l; i--) {
+methodOop m = (methodOop)methods->obj_at(i);
+assert(m->is_method(), "must be method");
+if (m->name() != name) break;
+if (m->signature() == signature) return m;
+}
+// search upwards
+for (i = mid + 1; i <= h; i++) {
+methodOop m = (methodOop)methods->obj_at(i);
+assert(m->is_method(), "must be method");
+if (m->name() != name) break;
+if (m->signature() == signature) return m;
+}
+// not found
+#ifdef ASSERT
+int index = linear_search(methods, name, signature);
+if (index != -1) fatal1("binary search bug: should have found entry %d", index);
+#endif
+return NULL;
+} else if (res < 0) {
+l = mid + 1;
+} else {
+h = mid - 1;
+}
+}
+#ifdef ASSERT
+int index = linear_search(methods, name, signature);
+if (index != -1) fatal1("binary search bug: should have found entry %d", index);
+#endif
+return NULL;
+}
+methodOop instanceKlass::uncached_lookup_method(symbolOop name, symbolOop signature) const {
+klassOop klass = as_klassOop();
+while (klass != NULL) {
+methodOop method = instanceKlass::cast(klass)->find_method(name, signature);
+if (method != NULL) return method;
+klass = instanceKlass::cast(klass)->super();
+}
+return NULL;
+}
+// lookup a method in all the interfaces that this class implements
+methodOop instanceKlass::lookup_method_in_all_interfaces(symbolOop name,
+symbolOop signature) const {
+objArrayOop all_ifs = instanceKlass::cast(as_klassOop())->transitive_interfaces();
+int num_ifs = all_ifs->length();
+instanceKlass *ik = NULL;
+for (int i = 0; i < num_ifs; i++) {
+ik = instanceKlass::cast(klassOop(all_ifs->obj_at(i)));
+methodOop m = ik->lookup_method(name, signature);
+if (m != NULL) {
+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->as_klassOop(), 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->as_klassOop(), offset);
+}
+return probe;
+}
+// Lookup or create a jmethodID.
+// This code can be called by the VM thread.  For this reason it is critical that
+// there are no blocking operations (safepoints) while the lock is held -- or a
+// deadlock can occur.
+jmethodID instanceKlass::jmethod_id_for_impl(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;
+// array length stored in first element, other elements offset by one
+if (jmeths == NULL ||                         // If there is no jmethodID array,
+(length = (size_t)jmeths[0]) <= idnum ||  // or if it is too short,
+(id = jmeths[idnum+1]) == NULL) {         // or if this jmethodID isn't allocated
+// Do all the safepointing things (allocations) before grabbing the lock.
+// These allocations will have to be freed if they are unused.
+// Allocate a new array of methods.
+jmethodID* to_dealloc_jmeths = NULL;
+jmethodID* new_jmeths = NULL;
+if (length <= idnum) {
+// A new array will be needed (unless some other thread beats us to it)
+size_t size = MAX2(idnum+1, (size_t)ik_h->idnum_allocated_count());
+new_jmeths = NEW_C_HEAP_ARRAY(jmethodID, size+1);
+memset(new_jmeths, 0, (size+1)*sizeof(jmethodID));
+new_jmeths[0] =(jmethodID)size;  // array size held in the first element
+}
+// Allocate a new method ID.
+jmethodID to_dealloc_id = NULL;
+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
+methodOop current_method = ik_h->method_with_idnum((int)idnum);
+assert(current_method != NULL, "old and but not obsolete, so should exist");
+methodHandle current_method_h(current_method == NULL? method_h() : current_method);
+new_id = JNIHandles::make_jmethod_id(current_method_h);
+} else {
+// It is the current version of the method or an obsolete method,
+// use the version passed in
+new_id = JNIHandles::make_jmethod_id(method_h);
+}
+{
+MutexLocker ml(JmethodIdCreation_lock);
+// We must not go to a safepoint while holding this lock.
+debug_only(No_Safepoint_Verifier nosafepoints;)
+// Retry lookup after we got the lock
+jmeths = ik_h->methods_jmethod_ids_acquire();
+if (jmeths == NULL || (length = (size_t)jmeths[0]) <= idnum) {
+if (jmeths != NULL) {
+// We have grown the array: copy the existing entries, and delete the old array
+for (size_t index = 0; index < length; index++) {
+new_jmeths[index+1] = jmeths[index+1];
+}
+to_dealloc_jmeths = jmeths; // using the new jmeths, deallocate the old one
+}
+ik_h->release_set_methods_jmethod_ids(jmeths = new_jmeths);
+} else {
+id = jmeths[idnum+1];
+to_dealloc_jmeths = new_jmeths; // using the old jmeths, deallocate the new one
+}
+if (id == NULL) {
+id = new_id;
+jmeths[idnum+1] = id;  // install the new method ID
+} else {
+to_dealloc_id = new_id; // the new id wasn't used, mark it for deallocation
+}
+}
+// Free up unneeded or no longer needed resources
+FreeHeap(to_dealloc_jmeths);
+if (to_dealloc_id != NULL) {
+JNIHandles::destroy_jmethod_id(to_dealloc_id);
+}
+}
+return id;
+}
+// Lookup a jmethodID, NULL if not found.  Do no blocking, no allocations, no handles
+jmethodID instanceKlass::jmethod_id_or_null(methodOop 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 jmethodID array,
+(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;
+}
+// Cache an itable index
+void instanceKlass::set_cached_itable_index(size_t idnum, int index) {
+int* indices = methods_cached_itable_indices_acquire();
+if (indices == NULL ||                         // If there is no index array,
+((size_t)indices[0]) <= idnum) {           // or if it is too short
+// Lock before we allocate the array so we don't leak
+MutexLocker ml(JNICachedItableIndex_lock);
+// Retry lookup after we got the lock
+indices = methods_cached_itable_indices_acquire();
+size_t length = 0;
+// array length stored in first element, other elements offset by one
+if (indices == NULL || (length = (size_t)indices[0]) <= idnum) {
+size_t size = MAX2(idnum+1, (size_t)idnum_allocated_count());
+int* new_indices = NEW_C_HEAP_ARRAY(int, size+1);
+// Copy the existing entries, if any
+size_t i;
+for (i = 0; i < length; i++) {
+new_indices[i+1] = indices[i+1];
+}
+// Set all the rest to -1
+for (i = length; i < size; i++) {
+new_indices[i+1] = -1;
+}
+if (indices != NULL) {
+FreeHeap(indices);  // delete any old indices
+}
+release_set_methods_cached_itable_indices(indices = new_indices);
+}
+} else {
+CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
+}
+// This is a cache, if there is a race to set it, it doesn't matter
+indices[idnum+1] = index;
+}
+// Retrieve a cached itable index
+int instanceKlass::cached_itable_index(size_t idnum) {
+int* indices = methods_cached_itable_indices_acquire();
+if (indices != NULL && ((size_t)indices[0]) > idnum) {
+// indices exist and are long enough, retrieve possible cached
+return indices[idnum+1];
+}
+return -1;
+}
+//
+// nmethodBucket is used to record dependent nmethods for
+// deoptimization.  nmethod dependencies are actually <klass, method>
+// pairs but we really only care about the klass part for purposes of
+// finding nmethods which might need to be deoptimized.  Instead of
+// recording the method, a count of how many times a particular nmethod
+// was recorded is kept.  This ensures that any recording errors are
+// noticed since an nmethod should be removed as many times are it's
+// added.
+//
+class nmethodBucket {
+private:
+nmethod*       _nmethod;
+int            _count;
+nmethodBucket* _next;
+public:
+nmethodBucket(nmethod* nmethod, nmethodBucket* next) {
+_nmethod = nmethod;
+_next = next;
+_count = 1;
+}
+int count()                             { return _count; }
+int increment()                         { _count += 1; return _count; }
+int decrement()                         { _count -= 1; assert(_count >= 0, "don't underflow"); return _count; }
+nmethodBucket* next()                   { return _next; }
+void set_next(nmethodBucket* b)         { _next = b; }
+nmethod* get_nmethod()                  { return _nmethod; }
+};
+//
+// Walk the list of dependent nmethods searching for nmethods which
+// are dependent on the klassOop that was 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 (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;
+}
+//
+// 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()) {
+if (b->decrement() == 0) {
+if (last == NULL) {
+_dependencies = b->next();
+} else {
+last->set_next(b->next());
+}
+delete b;
+}
+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()) {
+return true;
+}
+b = b->next();
+}
+return false;
+}
+#endif //PRODUCT
+void instanceKlass::follow_static_fields() {
+oop* start = start_of_static_fields();
+oop* end   = start + static_oop_field_size();
+while (start < end) {
+if (*start != NULL) {
+assert(Universe::heap()->is_in_closed_subset(*start),
+"should be in heap");
+MarkSweep::mark_and_push(start);
+}
+start++;
+}
+}
+#ifndef SERIALGC
+void instanceKlass::follow_static_fields(ParCompactionManager* cm) {
+oop* start = start_of_static_fields();
+oop* end   = start + static_oop_field_size();
+while (start < end) {
+if (*start != NULL) {
+assert(Universe::heap()->is_in(*start), "should be in heap");
+PSParallelCompact::mark_and_push(cm, start);
+}
+start++;
+}
+}
+#endif // SERIALGC
+void instanceKlass::adjust_static_fields() {
+oop* start = start_of_static_fields();
+oop* end   = start + static_oop_field_size();
+while (start < end) {
+MarkSweep::adjust_pointer(start);
+start++;
+}
+}
+#ifndef SERIALGC
+void instanceKlass::update_static_fields() {
+oop* const start = start_of_static_fields();
+oop* const beg_oop = start;
+oop* const end_oop = start + static_oop_field_size();
+for (oop* cur_oop = beg_oop; cur_oop < end_oop; ++cur_oop) {
+PSParallelCompact::adjust_pointer(cur_oop);
+}
+}
+void
+instanceKlass::update_static_fields(HeapWord* beg_addr, HeapWord* end_addr) {
+oop* const start = start_of_static_fields();
+oop* const beg_oop = MAX2((oop*)beg_addr, start);
+oop* const end_oop = MIN2((oop*)end_addr, start + static_oop_field_size());
+for (oop* cur_oop = beg_oop; cur_oop < end_oop; ++cur_oop) {
+PSParallelCompact::adjust_pointer(cur_oop);
+}
+}
+#endif // SERIALGC
+void instanceKlass::oop_follow_contents(oop obj) {
+assert (obj!=NULL, "can't follow the content of NULL object");
+obj->follow_header();
+OopMapBlock* map     = start_of_nonstatic_oop_maps();
+OopMapBlock* end_map = map + nonstatic_oop_map_size();
+while (map < end_map) {
+oop* start = obj->obj_field_addr(map->offset());
+oop* end   = start + map->length();
+while (start < end) {
+if (*start != NULL) {
+assert(Universe::heap()->is_in_closed_subset(*start),
+"should be in heap");
+MarkSweep::mark_and_push(start);
+}
+start++;
+}
+map++;
+}
+}
+#ifndef SERIALGC
+void instanceKlass::oop_follow_contents(ParCompactionManager* cm,
+oop obj) {
+assert (obj!=NULL, "can't follow the content of NULL object");
+obj->follow_header(cm);
+OopMapBlock* map     = start_of_nonstatic_oop_maps();
+OopMapBlock* end_map = map + nonstatic_oop_map_size();
+while (map < end_map) {
+oop* start = obj->obj_field_addr(map->offset());
+oop* end   = start + map->length();
+while (start < end) {
+if (*start != NULL) {
+assert(Universe::heap()->is_in(*start), "should be in heap");
+PSParallelCompact::mark_and_push(cm, start);
+}
+start++;
+}
+map++;
+}
+}
+#endif // SERIALGC
+#define invoke_closure_on(start, closure, nv_suffix) {                          \
+oop obj = *(start);                                                           \
+if (obj != NULL) {                                                            \
+assert(Universe::heap()->is_in_closed_subset(obj), "should be in heap");    \
+(closure)->do_oop##nv_suffix(start);                                        \
+}                                                                             \
+}
+// closure's do_header() method dicates 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 (closure->do_header()) {                                                   \
+obj->oop_iterate_header(closure);                                           \
+}                                                                             \
+/* instance variables */                                                      \
+OopMapBlock* map     = start_of_nonstatic_oop_maps();                         \
+OopMapBlock* const end_map = map + nonstatic_oop_map_size();                  \
+const intx field_offset    = PrefetchFieldsAhead;                             \
+if (field_offset > 0) {                                                       \
+while (map < end_map) {                                                     \
+oop* start = obj->obj_field_addr(map->offset());                          \
+oop* const end   = start + map->length();                                 \
+while (start < end) {                                                     \
+prefetch_beyond(start, (oop*)end, field_offset,                         \
+closure->prefetch_style());                             \
+SpecializationStats::                                                   \
+record_do_oop_call##nv_suffix(SpecializationStats::ik);               \
+invoke_closure_on(start, closure, nv_suffix);                           \
+start++;                                                                \
+}                                                                         \
+map++;                                                                    \
+}                                                                           \
+} else {                                                                      \
+while (map < end_map) {                                                     \
+oop* start = obj->obj_field_addr(map->offset());                          \
+oop* const end   = start + map->length();                                 \
+while (start < end) {                                                     \
+SpecializationStats::                                                   \
+record_do_oop_call##nv_suffix(SpecializationStats::ik);               \
+invoke_closure_on(start, closure, nv_suffix);                           \
+start++;                                                                \
+}                                                                         \
+map++;                                                                    \
+}                                                                           \
+}                                                                             \
+return size_helper();                                                         \
+}
+#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); \
+/* header */                                                                  \
+if (closure->do_header()) {                                                   \
+obj->oop_iterate_header(closure, mr);                                       \
+}                                                                             \
+/* instance variables */                                                      \
+OopMapBlock* map     = start_of_nonstatic_oop_maps();                         \
+OopMapBlock* const end_map = map + nonstatic_oop_map_size();                  \
+HeapWord* bot = mr.start();                                                   \
+HeapWord* top = mr.end();                                                     \
+oop* start = obj->obj_field_addr(map->offset());                              \
+HeapWord* end = MIN2((HeapWord*)(start + map->length()), top);                \
+/* Find the first map entry that extends onto mr. */                          \
+while (map < end_map && end <= bot) {                                         \
+map++;                                                                      \
+start = obj->obj_field_addr(map->offset());                                 \
+end = MIN2((HeapWord*)(start + map->length()), top);                        \
+}                                                                             \
+if (map != end_map) {                                                         \
+/* The current map's end is past the start of "mr".  Skip up to the first   \
+entry on "mr". */                                                        \
+while ((HeapWord*)start < bot) {                                            \
+start++;                                                                  \
+}                                                                           \
+const intx field_offset = PrefetchFieldsAhead;                              \
+for (;;) {                                                                  \
+if (field_offset > 0) {                                                   \
+while ((HeapWord*)start < end) {                                        \
+prefetch_beyond(start, (oop*)end, field_offset,                       \
+closure->prefetch_style());                           \
+invoke_closure_on(start, closure, nv_suffix);                         \
+start++;                                                              \
+}                                                                       \
+} else {                                                                  \
+while ((HeapWord*)start < end) {                                        \
+invoke_closure_on(start, closure, nv_suffix);                         \
+start++;                                                              \
+}                                                                       \
+}                                                                         \
+/* Go to the next map. */                                                 \
+map++;                                                                    \
+if (map == end_map) {                                                     \
+break;                                                                  \
+}                                                                         \
+/* Otherwise,  */                                                         \
+start = obj->obj_field_addr(map->offset());                               \
+if ((HeapWord*)start >= top) {                                            \
+break;                                                                  \
+}                                                                         \
+end = MIN2((HeapWord*)(start + map->length()), top);                      \
+}                                                                           \
+}                                                                             \
+return size_helper();                                                         \
+}
+ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DEFN)
+ALL_OOP_OOP_ITERATE_CLOSURES_3(InstanceKlass_OOP_OOP_ITERATE_DEFN)
+ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DEFN_m)
+ALL_OOP_OOP_ITERATE_CLOSURES_3(InstanceKlass_OOP_OOP_ITERATE_DEFN_m)
+void instanceKlass::iterate_static_fields(OopClosure* closure) {
+oop* start = start_of_static_fields();
+oop* end   = start + static_oop_field_size();
+while (start < end) {
+assert(Universe::heap()->is_in_reserved_or_null(*start), "should be in heap");
+closure->do_oop(start);
+start++;
+}
+}
+void instanceKlass::iterate_static_fields(OopClosure* closure,
+MemRegion mr) {
+oop* start = start_of_static_fields();
+oop* end   = start + static_oop_field_size();
+// I gather that the the static fields of reference types come first,
+// hence the name of "oop_field_size", and that is what makes this safe.
+assert((intptr_t)mr.start() ==
+align_size_up((intptr_t)mr.start(), sizeof(oop)) &&
+(intptr_t)mr.end() == align_size_up((intptr_t)mr.end(), sizeof(oop)),
+"Memregion must be oop-aligned.");
+if ((HeapWord*)start < mr.start()) start = (oop*)mr.start();
+if ((HeapWord*)end   > mr.end())   end   = (oop*)mr.end();
+while (start < end) {
+invoke_closure_on(start, closure,_v);
+start++;
+}
+}
+int instanceKlass::oop_adjust_pointers(oop obj) {
+int size = size_helper();
+// 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_size();
+// Iterate over oopmap blocks
+while (map < end_map) {
+// Compute oop range for this block
+oop* start = obj->obj_field_addr(map->offset());
+oop* end   = start + map->length();
+// Iterate over oops
+while (start < end) {
+assert(Universe::heap()->is_in_or_null(*start), "should be in heap");
+MarkSweep::adjust_pointer(start);
+start++;
+}
+map++;
+}
+obj->adjust_header();
+return size;
+}
+#ifndef SERIALGC
+void instanceKlass::oop_copy_contents(PSPromotionManager* pm, oop obj) {
+assert(!pm->depth_first(), "invariant");
+// Compute oopmap block range. The common case is nonstatic_oop_map_size == 1.
+OopMapBlock* start_map = start_of_nonstatic_oop_maps();
+OopMapBlock* map       = start_map + nonstatic_oop_map_size();
+// Iterate over oopmap blocks
+while (start_map < map) {
+--map;
+// Compute oop range for this block
+oop* start = obj->obj_field_addr(map->offset());
+oop* curr  = start + map->length();
+// Iterate over oops
+while (start < curr) {
+--curr;
+if (PSScavenge::should_scavenge(*curr)) {
+assert(Universe::heap()->is_in(*curr), "should be in heap");
+pm->claim_or_forward_breadth(curr);
+}
+}
+}
+}
+void instanceKlass::oop_push_contents(PSPromotionManager* pm, oop obj) {
+assert(pm->depth_first(), "invariant");
+// Compute oopmap block range. The common case is nonstatic_oop_map_size == 1.
+OopMapBlock* start_map = start_of_nonstatic_oop_maps();
+OopMapBlock* map       = start_map + nonstatic_oop_map_size();
+// Iterate over oopmap blocks
+while (start_map < map) {
+--map;
+// Compute oop range for this block
+oop* start = obj->obj_field_addr(map->offset());
+oop* curr  = start + map->length();
+// Iterate over oops
+while (start < curr) {
+--curr;
+if (PSScavenge::should_scavenge(*curr)) {
+assert(Universe::heap()->is_in(*curr), "should be in heap");
+pm->claim_or_forward_depth(curr);
+}
+}
+}
+}
+int instanceKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) {
+// 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_size();
+// Iterate over oopmap blocks
+while (map < end_map) {
+// Compute oop range for this oopmap block.
+oop* const map_start = obj->obj_field_addr(map->offset());
+oop* const beg_oop = map_start;
+oop* const end_oop = map_start + map->length();
+for (oop* cur_oop = beg_oop; cur_oop < end_oop; ++cur_oop) {
+PSParallelCompact::adjust_pointer(cur_oop);
+}
+++map;
+}
+return size_helper();
+}
+int instanceKlass::oop_update_pointers(ParCompactionManager* cm, oop obj,
+HeapWord* beg_addr, HeapWord* end_addr) {
+// 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_size();
+// Iterate over oopmap blocks
+while (map < end_map) {
+// Compute oop range for this oopmap block.
+oop* const map_start = obj->obj_field_addr(map->offset());
+oop* const beg_oop = MAX2((oop*)beg_addr, map_start);
+oop* const end_oop = MIN2((oop*)end_addr, map_start + map->length());
+for (oop* cur_oop = beg_oop; cur_oop < end_oop; ++cur_oop) {
+PSParallelCompact::adjust_pointer(cur_oop);
+}
+++map;
+}
+return size_helper();
+}
+void instanceKlass::copy_static_fields(PSPromotionManager* pm) {
+assert(!pm->depth_first(), "invariant");
+// Compute oop range
+oop* start = start_of_static_fields();
+oop* end   = start + static_oop_field_size();
+// Iterate over oops
+while (start < end) {
+if (PSScavenge::should_scavenge(*start)) {
+assert(Universe::heap()->is_in(*start), "should be in heap");
+pm->claim_or_forward_breadth(start);
+}
+start++;
+}
+}
+void instanceKlass::push_static_fields(PSPromotionManager* pm) {
+assert(pm->depth_first(), "invariant");
+// Compute oop range
+oop* start = start_of_static_fields();
+oop* end   = start + static_oop_field_size();
+// Iterate over oops
+while (start < end) {
+if (PSScavenge::should_scavenge(*start)) {
+assert(Universe::heap()->is_in(*start), "should be in heap");
+pm->claim_or_forward_depth(start);
+}
+start++;
+}
+}
+void instanceKlass::copy_static_fields(ParCompactionManager* cm) {
+// Compute oop range
+oop* start = start_of_static_fields();
+oop* end   = start + static_oop_field_size();
+// Iterate over oops
+while (start < end) {
+if (*start != NULL) {
+assert(Universe::heap()->is_in(*start), "should be in heap");
+// *start = (oop) cm->summary_data()->calc_new_pointer(*start);
+PSParallelCompact::adjust_pointer(start);
+}
+start++;
+}
+}
+#endif // SERIALGC
+// This klass is alive but the implementor link is not followed/updated.
+// Subklass and sibling links are handled by Klass::follow_weak_klass_links
+void instanceKlass::follow_weak_klass_links(
+BoolObjectClosure* is_alive, OopClosure* keep_alive) {
+assert(is_alive->do_object_b(as_klassOop()), "this oop should be live");
+if (ClassUnloading) {
+for (int i = 0; i < implementors_limit; i++) {
+klassOop impl = _implementors[i];
+if (impl == NULL)  break;  // no more in the list
+if (!is_alive->do_object_b(impl)) {
+// remove this guy from the list by overwriting him with the tail
+int lasti = --_nof_implementors;
+assert(lasti >= i && lasti < implementors_limit, "just checking");
+_implementors[i] = _implementors[lasti];
+_implementors[lasti] = NULL;
+--i; // rerun the loop at this index
+}
+}
+} else {
+for (int i = 0; i < implementors_limit; i++) {
+keep_alive->do_oop(&adr_implementors()[i]);
+}
+}
+Klass::follow_weak_klass_links(is_alive, keep_alive);
+}
+void instanceKlass::remove_unshareable_info() {
+Klass::remove_unshareable_info();
+init_implementor();
+}
+static void clear_all_breakpoints(methodOop m) {
+m->clear_all_breakpoints();
+}
+void instanceKlass::release_C_heap_structures() {
+// 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);
+}
+int* indices = methods_cached_itable_indices_acquire();
+if (indices != (int*)NULL) {
+release_set_methods_cached_itable_indices(NULL);
+FreeHeap(indices);
+}
+// 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_bytes != NULL) {
+os::free(_cached_class_file_bytes);
+_cached_class_file_bytes = NULL;
+_cached_class_file_len = 0;
+}
+}
+char* instanceKlass::signature_name() const {
+const char* src = (const char*) (name()->as_C_string());
+const int src_length = (int)strlen(src);
+char* dest = NEW_RESOURCE_ARRAY(char, src_length + 3);
+int src_index = 0;
+int dest_index = 0;
+dest[dest_index++] = 'L';
+while (src_index < src_length) {
+dest[dest_index++] = src[src_index++];
+}
+dest[dest_index++] = ';';
+dest[dest_index] = '\0';
+return dest;
+}
+// different verisons of is_same_class_package
+bool instanceKlass::is_same_class_package(klassOop class2) {
+klassOop class1 = as_klassOop();
+oop classloader1 = instanceKlass::cast(class1)->class_loader();
+symbolOop classname1 = Klass::cast(class1)->name();
+if (Klass::cast(class2)->oop_is_objArray()) {
+class2 = objArrayKlass::cast(class2)->bottom_klass();
+}
+oop classloader2;
+if (Klass::cast(class2)->oop_is_instance()) {
+classloader2 = instanceKlass::cast(class2)->class_loader();
+} else {
+assert(Klass::cast(class2)->oop_is_typeArray(), "should be type array");
+classloader2 = NULL;
+}
+symbolOop classname2 = Klass::cast(class2)->name();
+return instanceKlass::is_same_class_package(classloader1, classname1,
+classloader2, classname2);
+}
+bool instanceKlass::is_same_class_package(oop classloader2, symbolOop classname2) {
+klassOop class1 = as_klassOop();
+oop classloader1 = instanceKlass::cast(class1)->class_loader();
+symbolOop classname1 = Klass::cast(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, symbolOop class_name1,
+oop class_loader2, symbolOop class_name2) {
+if (class_loader1 != class_loader2) {
+return false;
+} else {
+ResourceMark rm;
+// The symbolOop'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.
+jbyte *name1 = class_name1->base();
+jbyte *name2 = class_name2->base();
+jbyte *last_slash1 = UTF8::strrchr(name1, class_name1->utf8_length(), '/');
+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);
+}
+}
+}
+jint instanceKlass::compute_modifier_flags(TRAPS) const {
+klassOop k = as_klassOop();
+jint access = access_flags().as_int();
+// But check if it happens to be member class.
+typeArrayOop inner_class_list = inner_classes();
+int length = (inner_class_list == NULL) ? 0 : inner_class_list->length();
+assert (length % instanceKlass::inner_class_next_offset == 0, "just checking");
+if (length > 0) {
+typeArrayHandle inner_class_list_h(THREAD, inner_class_list);
+instanceKlassHandle ik(THREAD, k);
+for (int i = 0; i < length; i += instanceKlass::inner_class_next_offset) {
+int ioff = inner_class_list_h->ushort_at(
+i + instanceKlass::inner_class_inner_class_info_offset);
+// 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.
+symbolOop inner_name = ik->constants()->klass_name_at(ioff);
+if ((ik->name() == inner_name)) {
+// This is really a member class.
+access = inner_class_list_h->ushort_at(i + instanceKlass::inner_class_access_flags_offset);
+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;
+}
+methodOop instanceKlass::method_at_itable(klassOop 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 reciever class,
+// the VM should throw IncompatibleClassChangeError.
+if (cnt >= nof_interfaces) {
+THROW_OOP_0(vmSymbols::java_lang_IncompatibleClassChangeError());
+}
+klassOop ik = ioe->interface_klass();
+if (ik == holder) break;
+}
+itableMethodEntry* ime = ioe->first_method_entry(as_klassOop());
+methodOop m = ime[index].method();
+if (m == NULL) {
+THROW_OOP_0(vmSymbols::java_lang_AbstractMethodError());
+}
+return m;
+}
+// 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_link(osr_nmethods_head());
+set_osr_nmethods_head(n);
+// Remember to unlock again
+OsrList_lock->unlock();
+}
+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();
+// Search for match
+while(cur != NULL && cur != n) {
+last = cur;
+cur = cur->link();
+}
+if (cur == n) {
+if (last == NULL) {
+// Remove first element
+set_osr_nmethods_head(osr_nmethods_head()->link());
+} else {
+last->set_link(cur->link());
+}
+}
+n->set_link(NULL);
+// Remember to unlock again
+OsrList_lock->unlock();
+}
+nmethod* instanceKlass::lookup_osr_nmethod(const methodOop m, int bci) 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();
+while (osr != NULL) {
+assert(osr->is_osr_method(), "wrong kind of nmethod found in chain");
+if (osr->method() == m &&
+(bci == InvocationEntryBci || osr->osr_entry_bci() == bci)) {
+// Found a match - return it.
+OsrList_lock->unlock();
+return osr;
+}
+osr = osr->link();
+}
+OsrList_lock->unlock();
+return NULL;
+}
+// -----------------------------------------------------------------------------------------------------
+#ifndef PRODUCT
+// Printing
+void FieldPrinter::do_field(fieldDescriptor* fd) {
+if (fd->is_static() == (_obj == NULL)) {
+_st->print("   - ");
+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 (as_klassOop() == 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("string: ");
+Handle h_obj(obj);
+java_lang_String::print(h_obj, st);
+st->cr();
+if (!WizardMode)  return;  // that is enough
+}
+}
+st->print_cr("fields:");
+FieldPrinter print_nonstatic_field(st, obj);
+do_nonstatic_fields(&print_nonstatic_field);
+if (as_klassOop() == SystemDictionary::class_klass()) {
+klassOop mirrored_klass = java_lang_Class::as_klassOop(obj);
+st->print("   - fake entry for mirror: ");
+mirrored_klass->print_value_on(st);
+st->cr();
+st->print("   - fake entry resolved_constructor: ");
+methodOop ctor = java_lang_Class::resolved_constructor(obj);
+ctor->print_value_on(st);
+klassOop array_klass = java_lang_Class::array_klass(obj);
+st->print("   - fake entry for array: ");
+array_klass->print_value_on(st);
+st->cr();
+st->cr();
+}
+}
+void instanceKlass::oop_print_value_on(oop obj, outputStream* st) {
+st->print("a ");
+name()->print_value_on(st);
+obj->print_address_on(st);
+}
+#endif
+const char* instanceKlass::internal_name() const {
+return external_name();
+}
+// Verification
+class VerifyFieldClosure: public OopClosure {
+public:
+void do_oop(oop* p) {
+guarantee(Universe::heap()->is_in_closed_subset(p), "should be in heap");
+if (!(*p)->is_oop_or_null()) {
+tty->print_cr("Failed: %p -> %p",p,(address)*p);
+Universe::print();
+guarantee(false, "boom");
+}
+}
+};
+void instanceKlass::oop_verify_on(oop obj, outputStream* st) {
+Klass::oop_verify_on(obj, st);
+VerifyFieldClosure blk;
+oop_oop_iterate(obj, &blk);
+}
+#ifndef PRODUCT
+void instanceKlass::verify_class_klass_nonstatic_oop_maps(klassOop k) {
+// This verification code is disabled.  JDK_Version::is_gte_jdk14x_version()
+// cannot be called since this function is called before the VM is
+// able to determine what JDK version is running with.
+// The check below always is false since 1.4.
+return;
+// This verification code temporarily disabled for the 1.4
+// reflection implementation since java.lang.Class now has
+// Java-level instance fields. Should rewrite this to handle this
+// case.
+if (!(JDK_Version::is_gte_jdk14x_version() && UseNewReflection)) {
+// Verify that java.lang.Class instances have a fake oop field added.
+instanceKlass* ik = instanceKlass::cast(k);
+// Check that we have the right class
+static bool first_time = true;
+guarantee(k == SystemDictionary::class_klass() && first_time, "Invalid verify of maps");
+first_time = false;
+const int extra = java_lang_Class::number_of_fake_oop_fields;
+guarantee(ik->nonstatic_field_size() == extra, "just checking");
+guarantee(ik->nonstatic_oop_map_size() == 1, "just checking");
+guarantee(ik->size_helper() == align_object_size(instanceOopDesc::header_size() + extra), "just checking");
+// Check that the map is (2,extra)
+int offset = java_lang_Class::klass_offset;
+OopMapBlock* map = ik->start_of_nonstatic_oop_maps();
+guarantee(map->offset() == offset && map->length() == extra, "just checking");
+}
+}
+#endif
+/* JNIid class for jfieldIDs only */
+JNIid::JNIid(klassOop 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::oops_do(OopClosure* f) {
+for (JNIid* cur = this; cur != NULL; cur = cur->next()) {
+f->do_oop(cur->holder_addr());
+}
+}
+void JNIid::deallocate(JNIid* current) {
+while (current != NULL) {
+JNIid* next = current->next();
+delete current;
+current = next;
+}
+}
+void JNIid::verify(klassOop holder) {
+int first_field_offset  = instanceKlass::cast(holder)->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 = as_klassOop()->is_shared() ? (_init_state <= state)
+: (_init_state < state);
+assert(good_state || state == allocated, "illegal state transition");
+_init_state = state;
+}
+#endif
+// RedefineClasses() support for previous versions:
+// Add an information node that contains weak references to the
+// interesting parts of the previous version of the_class.
+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)
+GrowableArray<PreviousVersionNode *>(2, true);
+}
+// RC_TRACE macro has an embedded ResourceMark
+RC_TRACE(0x00000100, ("adding previous version ref for %s @%d, EMCP_cnt=%d",
+ikh->external_name(), _previous_versions->length(), emcp_method_count));
+constantPoolHandle cp_h(ikh->constants());
+jweak cp_ref = JNIHandles::make_weak_global(cp_h);
+PreviousVersionNode * pv_node = NULL;
+objArrayOop old_methods = ikh->methods();
+if (emcp_method_count == 0) {
+pv_node = new PreviousVersionNode(cp_ref, NULL);
+RC_TRACE(0x00000400,
+("add: all methods are obsolete; flushing any EMCP weak refs"));
+} else {
+int local_count = 0;
+GrowableArray<jweak>* method_refs = new (ResourceObj::C_HEAP)
+GrowableArray<jweak>(emcp_method_count, true);
+for (int i = 0; i < old_methods->length(); i++) {
+if (emcp_methods->at(i)) {
+// this old method is EMCP so save a weak ref
+methodOop old_method = (methodOop) old_methods->obj_at(i);
+methodHandle old_method_h(old_method);
+jweak method_ref = JNIHandles::make_weak_global(old_method_h);
+method_refs->append(method_ref);
+if (++local_count >= emcp_method_count) {
+// no more EMCP methods so bail out now
+break;
+}
+}
+}
+pv_node = new PreviousVersionNode(cp_ref, method_refs);
+}
+_previous_versions->append(pv_node);
+// Using weak references allows the interesting parts of previous
+// classes to be GC'ed when they are no longer needed. Since the
+// caller is the VMThread and we are at a safepoint, this is a good
+// time to clear out unused weak references.
+RC_TRACE(0x00000400, ("add: previous version length=%d",
+_previous_versions->length()));
+// skip the last entry since we just added it
+for (int i = _previous_versions->length() - 2; i >= 0; i--) {
+// check the previous versions array for a GC'ed weak refs
+pv_node = _previous_versions->at(i);
+cp_ref = pv_node->prev_constant_pool();
+assert(cp_ref != NULL, "weak cp ref was unexpectedly cleared");
+if (cp_ref == NULL) {
+delete pv_node;
+_previous_versions->remove_at(i);
+// Since we are traversing the array backwards, we don't have to
+// do anything special with the index.
+continue;  // robustness
+}
+constantPoolOop cp = (constantPoolOop)JNIHandles::resolve(cp_ref);
+if (cp == NULL) {
+// this entry has been GC'ed so remove it
+delete pv_node;
+_previous_versions->remove_at(i);
+// Since we are traversing the array backwards, we don't have to
+// do anything special with the index.
+continue;
+} else {
+RC_TRACE(0x00000400, ("add: previous version @%d is alive", i));
+}
+GrowableArray<jweak>* method_refs = pv_node->prev_EMCP_methods();
+if (method_refs != NULL) {
+RC_TRACE(0x00000400, ("add: previous methods length=%d",
+method_refs->length()));
+for (int j = method_refs->length() - 1; j >= 0; j--) {
+jweak method_ref = method_refs->at(j);
+assert(method_ref != NULL, "weak method ref was unexpectedly cleared");
+if (method_ref == NULL) {
+method_refs->remove_at(j);
+// Since we are traversing the array backwards, we don't have to
+// do anything special with the index.
+continue;  // robustness
+}
+methodOop method = (methodOop)JNIHandles::resolve(method_ref);
+if (method == NULL || emcp_method_count == 0) {
+// This method entry has been GC'ed or the current
+// RedefineClasses() call has made all methods obsolete
+// so remove it.
+JNIHandles::destroy_weak_global(method_ref);
+method_refs->remove_at(j);
+} else {
+// RC_TRACE macro has an embedded ResourceMark
+RC_TRACE(0x00000400,
+("add: %s(%s): previous method @%d in version @%d is alive",
+method->name()->as_C_string(), method->signature()->as_C_string(),
+j, i));
+}
+}
+}
+}
+int obsolete_method_count = old_methods->length() - emcp_method_count;
+if (emcp_method_count != 0 && obsolete_method_count != 0 &&
+_previous_versions->length() > 1) {
+// We have a mix of obsolete and EMCP methods. If there is more
+// than the previous version that we just added, then 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
+methodOop old_method = (methodOop) old_methods->obj_at(i);
+symbolOop m_name = old_method->name();
+symbolOop m_signature = old_method->signature();
+// skip the last entry since we just added it
+for (int j = _previous_versions->length() - 2; j >= 0; j--) {
+// check the previous versions array for a GC'ed weak refs
+pv_node = _previous_versions->at(j);
+cp_ref = pv_node->prev_constant_pool();
+assert(cp_ref != NULL, "weak cp ref was unexpectedly cleared");
+if (cp_ref == NULL) {
+delete pv_node;
+_previous_versions->remove_at(j);
+// Since we are traversing the array backwards, we don't have to
+// do anything special with the index.
+continue;  // robustness
+}
+constantPoolOop cp = (constantPoolOop)JNIHandles::resolve(cp_ref);
+if (cp == NULL) {
+// this entry has been GC'ed so remove it
+delete pv_node;
+_previous_versions->remove_at(j);
+// Since we are traversing the array backwards, we don't have to
+// do anything special with the index.
+continue;
+}
+GrowableArray<jweak>* 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--) {
+jweak method_ref = method_refs->at(k);
+assert(method_ref != NULL,
+"weak method ref was unexpectedly cleared");
+if (method_ref == NULL) {
+method_refs->remove_at(k);
+// Since we are traversing the array backwards, we don't
+// have to do anything special with the index.
+continue;  // robustness
+}
+methodOop method = (methodOop)JNIHandles::resolve(method_ref);
+if (method == NULL) {
+// this method entry has been GC'ed so skip it
+JNIHandles::destroy_weak_global(method_ref);
+method_refs->remove_at(k);
+continue;
+}
+if (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 weak ref.
+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();
+JNIHandles::destroy_weak_global(method_ref);
+method_refs->remove_at(k);
+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 GC'ed,
+// but there still may be an older EMCP method that has not
+// been GC'ed.
+}
+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 {
+if (_previous_versions == NULL) {
+// no previous versions array so answer is easy
+return false;
+}
+for (int i = _previous_versions->length() - 1; i >= 0; i--) {
+// Check the previous versions array for an info node that hasn't
+// been GC'ed
+PreviousVersionNode * pv_node = _previous_versions->at(i);
+jweak cp_ref = pv_node->prev_constant_pool();
+assert(cp_ref != NULL, "weak reference was unexpectedly cleared");
+if (cp_ref == NULL) {
+continue;  // robustness
+}
+constantPoolOop cp = (constantPoolOop)JNIHandles::resolve(cp_ref);
+if (cp != NULL) {
+// we have at least one previous version
+return true;
+}
+// We don't have to check the method refs. If the constant pool has
+// been GC'ed then so have the methods.
+}
+// all of the underlying nodes' info has been GC'ed
+return false;
+} // end has_previous_version()
+methodOop instanceKlass::method_with_idnum(int idnum) {
+methodOop m = NULL;
+if (idnum < methods()->length()) {
+m = (methodOop) methods()->obj_at(idnum);
+}
+if (m == NULL || m->method_idnum() != idnum) {
+for (int index = 0; index < methods()->length(); ++index) {
+m = (methodOop) methods()->obj_at(index);
+if (m->method_idnum() == idnum) {
+return m;
+}
+}
+}
+return m;
+}
+// Set the annotation at 'idnum' to 'anno'.
+// We don't want to create or extend the array if 'anno' is NULL, since that is the
+// default value.  However, if the array exists and is long enough, we must set NULL values.
+void instanceKlass::set_methods_annotations_of(int idnum, typeArrayOop anno, objArrayOop* md_p) {
+objArrayOop md = *md_p;
+if (md != NULL && md->length() > idnum) {
+md->obj_at_put(idnum, anno);
+} else if (anno != NULL) {
+// create the array
+int length = MAX2(idnum+1, (int)_idnum_allocated_count);
+md = oopFactory::new_system_objArray(length, Thread::current());
+if (*md_p != NULL) {
+// copy the existing entries
+for (int index = 0; index < (*md_p)->length(); index++) {
+md->obj_at_put(index, (*md_p)->obj_at(index));
+}
+}
+set_annotations(md, md_p);
+md->obj_at_put(idnum, anno);
+} // if no array and idnum isn't included there is nothing to do
+}
+// Construct a PreviousVersionNode entry for the array hung off
+// the instanceKlass.
+PreviousVersionNode::PreviousVersionNode(jweak prev_constant_pool,
+GrowableArray<jweak>* 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) {
+JNIHandles::destroy_weak_global(_prev_constant_pool);
+}
+if (_prev_EMCP_methods != NULL) {
+for (int i = _prev_EMCP_methods->length() - 1; i >= 0; i--) {
+jweak method_ref = _prev_EMCP_methods->at(i);
+if (method_ref != NULL) {
+JNIHandles::destroy_weak_global(method_ref);
+}
+}
+delete _prev_EMCP_methods;
+}
+}
+// Construct a PreviousVersionInfo entry
+PreviousVersionInfo::PreviousVersionInfo(PreviousVersionNode *pv_node) {
+_prev_constant_pool_handle = constantPoolHandle();  // NULL handle
+_prev_EMCP_method_handles = NULL;
+jweak cp_ref = pv_node->prev_constant_pool();
+assert(cp_ref != NULL, "weak constant pool ref was unexpectedly cleared");
+if (cp_ref == NULL) {
+return;  // robustness
+}
+constantPoolOop cp = (constantPoolOop)JNIHandles::resolve(cp_ref);
+if (cp == NULL) {
+// Weak reference has been GC'ed. Since the constant pool has been
+// GC'ed, the methods have also been GC'ed.
+return;
+}
+// make the constantPoolOop safe to return
+_prev_constant_pool_handle = constantPoolHandle(cp);
+GrowableArray<jweak>* method_refs = pv_node->prev_EMCP_methods();
+if (method_refs == NULL) {
+// the instanceKlass did not have any EMCP methods
+return;
+}
+_prev_EMCP_method_handles = new GrowableArray<methodHandle>(10);
+int n_methods = method_refs->length();
+for (int i = 0; i < n_methods; i++) {
+jweak method_ref = method_refs->at(i);
+assert(method_ref != NULL, "weak method ref was unexpectedly cleared");
+if (method_ref == NULL) {
+continue;  // robustness
+}
+methodOop method = (methodOop)JNIHandles::resolve(method_ref);
+if (method == NULL) {
+// this entry has been GC'ed so skip it
+continue;
+}
+// make the methodOop safe to return
+_prev_EMCP_method_handles->append(methodHandle(method));
+}
+}
+// Destroy a PreviousVersionInfo
+PreviousVersionInfo::~PreviousVersionInfo() {
+// Since _prev_EMCP_method_handles is not C-heap allocated, we
+// don't have to delete it.
+}
+// Construct a helper for walking the previous versions array
+PreviousVersionWalker::PreviousVersionWalker(instanceKlass *ik) {
+_previous_versions = ik->previous_versions();
+_current_index = 0;
+// _hm needs no initialization
+_current_p = NULL;
+}
+// Destroy a PreviousVersionWalker
+PreviousVersionWalker::~PreviousVersionWalker() {
+// Delete the current info just in case the caller didn't walk to
+// the end of the previous versions list. No harm if _current_p is
+// already NULL.
+delete _current_p;
+// When _hm is destroyed, all the Handles returned in
+// PreviousVersionInfo objects will be destroyed.
+// Also, after this destructor is finished it will be
+// safe to delete the GrowableArray allocated in the
+// PreviousVersionInfo objects.
+}
+// Return the interesting information for the next previous version
+// of the klass. Returns NULL if there are no more previous versions.
+PreviousVersionInfo* PreviousVersionWalker::next_previous_version() {
+if (_previous_versions == NULL) {
+// no previous versions so nothing to return
+return NULL;
+}
+delete _current_p;  // cleanup the previous info for the caller
+_current_p = NULL;  // reset to NULL so we don't delete same object twice
+int length = _previous_versions->length();
+while (_current_index < length) {
+PreviousVersionNode * pv_node = _previous_versions->at(_current_index++);
+PreviousVersionInfo * pv_info = new (ResourceObj::C_HEAP)
+PreviousVersionInfo(pv_node);
+constantPoolHandle cp_h = pv_info->prev_constant_pool_handle();
+if (cp_h.is_null()) {
+delete pv_info;
+// The underlying node's info has been GC'ed so try the next one.
+// We don't have to check the methods. If the constant pool has
+// GC'ed then so have the methods.
+continue;
+}
+// Found a node with non GC'ed info so return it. The caller will
+// need to delete pv_info when they are done with it.
+_current_p = pv_info;
+return pv_info;
+}
+// all of the underlying nodes' info has been GC'ed
+return NULL;
+} // end next_previous_version()

changeset 1	489c9b5090e2
child 220	e6ef4818c49d
child 217	c646ef2f5d58