1 /*

     2  * Copyright (c) 2011, 2017, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    24 

    25 #include "precompiled.hpp"

    26 #include "classfile/javaClasses.hpp"

    27 #include "classfile/systemDictionary.hpp"

    28 #include "gc/shared/collectedHeap.inline.hpp"

    29 #include "gc/shared/specialized_oop_closures.hpp"

    30 #include "memory/iterator.inline.hpp"

    31 #include "memory/oopFactory.hpp"

    32 #include "oops/instanceKlass.hpp"

    33 #include "oops/instanceMirrorKlass.hpp"

    34 #include "oops/instanceOop.hpp"

    35 #include "oops/oop.inline.hpp"

    36 #include "oops/symbol.hpp"

    37 #include "runtime/handles.inline.hpp"

    38 #include "utilities/macros.hpp"

    39 

    40 int InstanceMirrorKlass::_offset_of_static_fields = 0;

    41 

    42 int InstanceMirrorKlass::instance_size(Klass* k) {

    43   if (k != NULL && k->is_instance_klass()) {

    44     return align_object_size(size_helper() + InstanceKlass::cast(k)->static_field_size());

    45   }

    46   return size_helper();

    47 }

    48 

    49 instanceOop InstanceMirrorKlass::allocate_instance(Klass* k, TRAPS) {

    50   // Query before forming handle.

    51   int size = instance_size(k);

    52   assert(size > 0, "total object size must be positive: %d", size);

    53 

    54   // Since mirrors can be variable sized because of the static fields, store

    55   // the size in the mirror itself.

    56   return (instanceOop)CollectedHeap::class_allocate(this, size, CHECK_NULL);

    57 }

    58 

    59 int InstanceMirrorKlass::oop_size(oop obj) const {

    60   return java_lang_Class::oop_size(obj);

    61 }

    62 

    63 int InstanceMirrorKlass::compute_static_oop_field_count(oop obj) {

    64   Klass* k = java_lang_Class::as_Klass(obj);

    65   if (k != NULL && k->is_instance_klass()) {

    66     return InstanceKlass::cast(k)->static_oop_field_count();

    67   }

    68   return 0;

    69 }