| /* |
| * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "classfile/javaClasses.hpp" |
| #include "classfile/systemDictionary.hpp" |
| #include "classfile/vmSymbols.hpp" |
| #include "gc/shared/collectedHeap.inline.hpp" |
| #include "gc/shared/gcLocker.hpp" |
| #include "jvmtifiles/jvmti.h" |
| #include "memory/resourceArea.hpp" |
| #include "memory/universe.inline.hpp" |
| #include "oops/arrayKlass.hpp" |
| #include "oops/arrayOop.hpp" |
| #include "oops/instanceKlass.hpp" |
| #include "oops/objArrayOop.hpp" |
| #include "oops/oop.inline.hpp" |
| |
| int ArrayKlass::static_size(int header_size) { |
| // size of an array klass object |
| assert(header_size <= InstanceKlass::header_size(), "bad header size"); |
| // If this assert fails, see comments in base_create_array_klass. |
| header_size = InstanceKlass::header_size(); |
| int vtable_len = Universe::base_vtable_size(); |
| int size = header_size + vtable_len; |
| return align_metadata_size(size); |
| } |
| |
| |
| Klass* ArrayKlass::java_super() const { |
| if (super() == NULL) return NULL; // bootstrap case |
| // Array klasses have primary supertypes which are not reported to Java. |
| // Example super chain: String[][] -> Object[][] -> Object[] -> Object |
| return SystemDictionary::Object_klass(); |
| } |
| |
| |
| oop ArrayKlass::multi_allocate(int rank, jint* sizes, TRAPS) { |
| ShouldNotReachHere(); |
| return NULL; |
| } |
| |
| // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined |
| Klass* ArrayKlass::find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const { |
| // There are no fields in an array klass but look to the super class (Object) |
| assert(super(), "super klass must be present"); |
| return super()->find_field(name, sig, fd); |
| } |
| |
| Method* ArrayKlass::uncached_lookup_method(const Symbol* name, |
| const Symbol* signature, |
| OverpassLookupMode overpass_mode) const { |
| // There are no methods in an array klass but the super class (Object) has some |
| assert(super(), "super klass must be present"); |
| // Always ignore overpass methods in superclasses, although technically the |
| // super klass of an array, (j.l.Object) should not have |
| // any overpass methods present. |
| return super()->uncached_lookup_method(name, signature, Klass::skip_overpass); |
| } |
| |
| ArrayKlass::ArrayKlass(Symbol* name) : |
| _dimension(1), |
| _higher_dimension(NULL), |
| _lower_dimension(NULL) { |
| // Arrays don't add any new methods, so their vtable is the same size as |
| // the vtable of klass Object. |
| set_vtable_length(Universe::base_vtable_size()); |
| set_name(name); |
| set_super(Universe::is_bootstrapping() ? (Klass*)NULL : SystemDictionary::Object_klass()); |
| set_layout_helper(Klass::_lh_neutral_value); |
| set_is_cloneable(); // All arrays are considered to be cloneable (See JLS 20.1.5) |
| TRACE_INIT_ID(this); |
| } |
| |
| |
| // Initialization of vtables and mirror object is done separatly from base_create_array_klass, |
| // since a GC can happen. At this point all instance variables of the ArrayKlass must be setup. |
| void ArrayKlass::complete_create_array_klass(ArrayKlass* k, KlassHandle super_klass, ModuleEntry* module_entry, TRAPS) { |
| ResourceMark rm(THREAD); |
| k->initialize_supers(super_klass(), CHECK); |
| k->vtable()->initialize_vtable(false, CHECK); |
| |
| // During bootstrapping, before java.base is defined, the module_entry may not be present yet. |
| // These classes will be put on a fixup list and their module fields will be patched once |
| // java.base is defined. |
| assert((module_entry != NULL) || ((module_entry == NULL) && !ModuleEntryTable::javabase_defined()), |
| "module entry not available post " JAVA_BASE_NAME " definition"); |
| oop module = (module_entry != NULL) ? JNIHandles::resolve(module_entry->module()) : (oop)NULL; |
| java_lang_Class::create_mirror(k, Handle(THREAD, k->class_loader()), Handle(THREAD, module), Handle(NULL), CHECK); |
| } |
| |
| GrowableArray<Klass*>* ArrayKlass::compute_secondary_supers(int num_extra_slots) { |
| // interfaces = { cloneable_klass, serializable_klass }; |
| assert(num_extra_slots == 0, "sanity of primitive array type"); |
| // Must share this for correct bootstrapping! |
| set_secondary_supers(Universe::the_array_interfaces_array()); |
| return NULL; |
| } |
| |
| bool ArrayKlass::compute_is_subtype_of(Klass* k) { |
| // An array is a subtype of Serializable, Clonable, and Object |
| return k == SystemDictionary::Object_klass() |
| || k == SystemDictionary::Cloneable_klass() |
| || k == SystemDictionary::Serializable_klass(); |
| } |
| |
| objArrayOop ArrayKlass::allocate_arrayArray(int n, int length, TRAPS) { |
| if (length < 0) { |
| THROW_0(vmSymbols::java_lang_NegativeArraySizeException()); |
| } |
| if (length > arrayOopDesc::max_array_length(T_ARRAY)) { |
| report_java_out_of_memory("Requested array size exceeds VM limit"); |
| JvmtiExport::post_array_size_exhausted(); |
| THROW_OOP_0(Universe::out_of_memory_error_array_size()); |
| } |
| int size = objArrayOopDesc::object_size(length); |
| Klass* k = array_klass(n+dimension(), CHECK_0); |
| ArrayKlass* ak = ArrayKlass::cast(k); |
| objArrayOop o = |
| (objArrayOop)CollectedHeap::array_allocate(ak, size, length, CHECK_0); |
| // initialization to NULL not necessary, area already cleared |
| return o; |
| } |
| |
| void ArrayKlass::array_klasses_do(void f(Klass* k, TRAPS), TRAPS) { |
| Klass* k = this; |
| // Iterate over this array klass and all higher dimensions |
| while (k != NULL) { |
| f(k, CHECK); |
| k = ArrayKlass::cast(k)->higher_dimension(); |
| } |
| } |
| |
| void ArrayKlass::array_klasses_do(void f(Klass* k)) { |
| Klass* k = this; |
| // Iterate over this array klass and all higher dimensions |
| while (k != NULL) { |
| f(k); |
| k = ArrayKlass::cast(k)->higher_dimension(); |
| } |
| } |
| |
| // JVM support |
| |
| jint ArrayKlass::compute_modifier_flags(TRAPS) const { |
| return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; |
| } |
| |
| // JVMTI support |
| |
| jint ArrayKlass::jvmti_class_status() const { |
| return JVMTI_CLASS_STATUS_ARRAY; |
| } |
| |
| void ArrayKlass::remove_unshareable_info() { |
| Klass::remove_unshareable_info(); |
| } |
| |
| void ArrayKlass::restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS) { |
| assert(loader_data == ClassLoaderData::the_null_class_loader_data(), "array classes belong to null loader"); |
| Klass::restore_unshareable_info(loader_data, protection_domain, CHECK); |
| // Klass recreates the component mirror also |
| } |
| |
| // Printing |
| |
| void ArrayKlass::print_on(outputStream* st) const { |
| assert(is_klass(), "must be klass"); |
| Klass::print_on(st); |
| } |
| |
| void ArrayKlass::print_value_on(outputStream* st) const { |
| assert(is_klass(), "must be klass"); |
| for(int index = 0; index < dimension(); index++) { |
| st->print("[]"); |
| } |
| } |
| |
| void ArrayKlass::oop_print_on(oop obj, outputStream* st) { |
| assert(obj->is_array(), "must be array"); |
| Klass::oop_print_on(obj, st); |
| st->print_cr(" - length: %d", arrayOop(obj)->length()); |
| } |
| |
| |
| // Verification |
| |
| void ArrayKlass::verify_on(outputStream* st) { |
| Klass::verify_on(st); |
| } |
| |
| void ArrayKlass::oop_verify_on(oop obj, outputStream* st) { |
| guarantee(obj->is_array(), "must be array"); |
| arrayOop a = arrayOop(obj); |
| guarantee(a->length() >= 0, "array with negative length?"); |
| } |