Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 1997, 2017, 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

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  */

 #include "precompiled.hpp"

 #include "classfile/javaClasses.hpp"

 #include "classfile/systemDictionary.hpp"

 #include "classfile/vmSymbols.hpp"

 #include "gc_interface/collectedHeap.inline.hpp"

 #include "jvmtifiles/jvmti.h"

 #include "memory/gcLocker.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();

 #ifdef _LP64

   int size = header_size + align_object_offset(vtable_len);

 #else

   int size = header_size + vtable_len;

 #endif

   return align_object_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(Symbol* name, 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) {

   set_name(name);

   set_super(Universe::is_bootstrapping() ? (Klass*)NULL : SystemDictionary::Object_klass());

   set_layout_helper(Klass::_lh_neutral_value);

   set_dimension(1);

   set_higher_dimension(NULL);

   set_lower_dimension(NULL);

   set_component_mirror(NULL);

   // Arrays don't add any new methods, so their vtable is the same size as

   // the vtable of klass Object.

   int vtable_size = Universe::base_vtable_size();

   set_vtable_length(vtable_size);

   set_is_cloneable(); // All arrays are considered to be cloneable (See JLS 20.1.5)

   JFR_ONLY(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, TRAPS) {

   ResourceMark rm(THREAD);

   k->initialize_supers(super_klass(), CHECK);

   k->vtable()->initialize_vtable(false, CHECK);

   java_lang_Class::create_mirror(k, Handle(THREAD, k->class_loader()), 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();

 }

 inline intptr_t* ArrayKlass::start_of_vtable() const {

   // all vtables start at the same place, that's why we use InstanceKlass::header_size here

   return ((intptr_t*)this) + InstanceKlass::header_size();

 }

 klassVtable* ArrayKlass::vtable() const {

   KlassHandle kh(Thread::current(), this);

   return new klassVtable(kh, start_of_vtable(), vtable_length() / vtableEntry::size());

 }

 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();

   }

 }

 // GC support

 void ArrayKlass::oops_do(OopClosure* cl) {

   Klass::oops_do(cl);

   cl->do_oop(adr_component_mirror());

 }

 // 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();

   // Clear the java mirror

   set_component_mirror(NULL);

 }

 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);

   if (component_mirror() != NULL) {

     guarantee(component_mirror()->klass() != NULL, "should have a class");

   }

 }

 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?");

 }