author | egahlin |
Tue, 15 May 2018 20:24:34 +0200 | |
changeset 50113 | caf115bb98ad |
parent 49948 | ff8dbb56740a |
child 50304 | d5331b94f821 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#include "precompiled.hpp" |
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#include "classfile/javaClasses.hpp" |
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#include "classfile/systemDictionary.hpp" |
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#include "classfile/vmSymbols.hpp" |
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#include "gc/shared/collectedHeap.inline.hpp" |
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#include "jvmtifiles/jvmti.h" |
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#include "memory/metaspaceClosure.hpp" |
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#include "memory/resourceArea.hpp" |
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#include "memory/universe.hpp" |
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#include "oops/arrayKlass.hpp" |
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#include "oops/arrayOop.hpp" |
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#include "oops/instanceKlass.hpp" |
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#include "oops/objArrayOop.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "runtime/handles.inline.hpp" |
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int ArrayKlass::static_size(int header_size) { |
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// size of an array klass object |
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assert(header_size <= InstanceKlass::header_size(), "bad header size"); |
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// If this assert fails, see comments in base_create_array_klass. |
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header_size = InstanceKlass::header_size(); |
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int vtable_len = Universe::base_vtable_size(); |
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int size = header_size + vtable_len; |
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return align_metadata_size(size); |
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} |
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Klass* ArrayKlass::java_super() const { |
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if (super() == NULL) return NULL; // bootstrap case |
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// Array klasses have primary supertypes which are not reported to Java. |
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// Example super chain: String[][] -> Object[][] -> Object[] -> Object |
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return SystemDictionary::Object_klass(); |
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} |
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oop ArrayKlass::multi_allocate(int rank, jint* sizes, TRAPS) { |
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ShouldNotReachHere(); |
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return NULL; |
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} |
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// find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined |
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Klass* ArrayKlass::find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const { |
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// There are no fields in an array klass but look to the super class (Object) |
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assert(super(), "super klass must be present"); |
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return super()->find_field(name, sig, fd); |
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} |
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Method* ArrayKlass::uncached_lookup_method(const Symbol* name, |
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const Symbol* signature, |
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OverpassLookupMode overpass_mode) const { |
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// There are no methods in an array klass but the super class (Object) has some |
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assert(super(), "super klass must be present"); |
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// Always ignore overpass methods in superclasses, although technically the |
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// super klass of an array, (j.l.Object) should not have |
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// any overpass methods present. |
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return super()->uncached_lookup_method(name, signature, Klass::skip_overpass); |
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} |
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ArrayKlass::ArrayKlass(Symbol* name) : |
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_dimension(1), |
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_higher_dimension(NULL), |
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_lower_dimension(NULL) { |
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// Arrays don't add any new methods, so their vtable is the same size as |
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// the vtable of klass Object. |
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set_vtable_length(Universe::base_vtable_size()); |
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set_name(name); |
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set_super(Universe::is_bootstrapping() ? (Klass*)NULL : SystemDictionary::Object_klass()); |
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set_layout_helper(Klass::_lh_neutral_value); |
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set_is_cloneable(); // All arrays are considered to be cloneable (See JLS 20.1.5) |
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JFR_ONLY(INIT_ID(this);) |
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} |
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// Initialization of vtables and mirror object is done separatly from base_create_array_klass, |
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// since a GC can happen. At this point all instance variables of the ArrayKlass must be setup. |
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void ArrayKlass::complete_create_array_klass(ArrayKlass* k, Klass* super_klass, ModuleEntry* module_entry, TRAPS) { |
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ResourceMark rm(THREAD); |
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k->initialize_supers(super_klass, NULL, CHECK); |
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k->vtable().initialize_vtable(false, CHECK); |
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// During bootstrapping, before java.base is defined, the module_entry may not be present yet. |
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// These classes will be put on a fixup list and their module fields will be patched once |
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// java.base is defined. |
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assert((module_entry != NULL) || ((module_entry == NULL) && !ModuleEntryTable::javabase_defined()), |
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"module entry not available post " JAVA_BASE_NAME " definition"); |
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oop module = (module_entry != NULL) ? module_entry->module() : (oop)NULL; |
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java_lang_Class::create_mirror(k, Handle(THREAD, k->class_loader()), Handle(THREAD, module), Handle(), CHECK); |
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} |
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GrowableArray<Klass*>* ArrayKlass::compute_secondary_supers(int num_extra_slots, |
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Array<Klass*>* transitive_interfaces) { |
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// interfaces = { cloneable_klass, serializable_klass }; |
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assert(num_extra_slots == 0, "sanity of primitive array type"); |
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assert(transitive_interfaces == NULL, "sanity"); |
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// Must share this for correct bootstrapping! |
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set_secondary_supers(Universe::the_array_interfaces_array()); |
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return NULL; |
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} |
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bool ArrayKlass::compute_is_subtype_of(Klass* k) { |
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// An array is a subtype of Serializable, Clonable, and Object |
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return k == SystemDictionary::Object_klass() |
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|| k == SystemDictionary::Cloneable_klass() |
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|| k == SystemDictionary::Serializable_klass(); |
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} |
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objArrayOop ArrayKlass::allocate_arrayArray(int n, int length, TRAPS) { |
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if (length < 0) { |
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THROW_0(vmSymbols::java_lang_NegativeArraySizeException()); |
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} |
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if (length > arrayOopDesc::max_array_length(T_ARRAY)) { |
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report_java_out_of_memory("Requested array size exceeds VM limit"); |
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JvmtiExport::post_array_size_exhausted(); |
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THROW_OOP_0(Universe::out_of_memory_error_array_size()); |
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} |
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int size = objArrayOopDesc::object_size(length); |
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Klass* k = array_klass(n+dimension(), CHECK_0); |
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ArrayKlass* ak = ArrayKlass::cast(k); |
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objArrayOop o = |
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(objArrayOop)CollectedHeap::array_allocate(ak, size, length, CHECK_0); |
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// initialization to NULL not necessary, area already cleared |
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return o; |
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} |
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void ArrayKlass::array_klasses_do(void f(Klass* k, TRAPS), TRAPS) { |
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Klass* k = this; |
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// Iterate over this array klass and all higher dimensions |
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while (k != NULL) { |
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f(k, CHECK); |
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k = ArrayKlass::cast(k)->higher_dimension(); |
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} |
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} |
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void ArrayKlass::array_klasses_do(void f(Klass* k)) { |
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Klass* k = this; |
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// Iterate over this array klass and all higher dimensions |
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while (k != NULL) { |
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f(k); |
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k = ArrayKlass::cast(k)->higher_dimension(); |
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} |
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} |
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// JVM support |
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jint ArrayKlass::compute_modifier_flags(TRAPS) const { |
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return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; |
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} |
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// JVMTI support |
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jint ArrayKlass::jvmti_class_status() const { |
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return JVMTI_CLASS_STATUS_ARRAY; |
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} |
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void ArrayKlass::metaspace_pointers_do(MetaspaceClosure* it) { |
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Klass::metaspace_pointers_do(it); |
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ResourceMark rm; |
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log_trace(cds)("Iter(ArrayKlass): %p (%s)", this, external_name()); |
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// need to cast away volatile |
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it->push((Klass**)&_higher_dimension); |
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it->push((Klass**)&_lower_dimension); |
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} |
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void ArrayKlass::remove_unshareable_info() { |
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Klass::remove_unshareable_info(); |
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if (_higher_dimension != NULL) { |
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ArrayKlass *ak = ArrayKlass::cast(higher_dimension()); |
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ak->remove_unshareable_info(); |
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} |
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} |
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void ArrayKlass::remove_java_mirror() { |
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Klass::remove_java_mirror(); |
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if (_higher_dimension != NULL) { |
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ArrayKlass *ak = ArrayKlass::cast(higher_dimension()); |
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ak->remove_java_mirror(); |
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} |
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} |
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void ArrayKlass::restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS) { |
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assert(loader_data == ClassLoaderData::the_null_class_loader_data(), "array classes belong to null loader"); |
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Klass::restore_unshareable_info(loader_data, protection_domain, CHECK); |
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// Klass recreates the component mirror also |
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|
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if (_higher_dimension != NULL) { |
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ArrayKlass *ak = ArrayKlass::cast(higher_dimension()); |
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ak->restore_unshareable_info(loader_data, protection_domain, CHECK); |
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} |
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} |
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|
1 | 217 |
// Printing |
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||
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void ArrayKlass::print_on(outputStream* st) const { |
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assert(is_klass(), "must be klass"); |
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Klass::print_on(st); |
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} |
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|
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void ArrayKlass::print_value_on(outputStream* st) const { |
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assert(is_klass(), "must be klass"); |
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for(int index = 0; index < dimension(); index++) { |
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st->print("[]"); |
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} |
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} |
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|
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void ArrayKlass::oop_print_on(oop obj, outputStream* st) { |
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assert(obj->is_array(), "must be array"); |
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Klass::oop_print_on(obj, st); |
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st->print_cr(" - length: %d", arrayOop(obj)->length()); |
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} |
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||
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|
1 | 238 |
// Verification |
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void ArrayKlass::verify_on(outputStream* st) { |
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Klass::verify_on(st); |
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} |
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|
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void ArrayKlass::oop_verify_on(oop obj, outputStream* st) { |
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guarantee(obj->is_array(), "must be array"); |
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arrayOop a = arrayOop(obj); |
|
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guarantee(a->length() >= 0, "array with negative length?"); |
|
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} |