1 /*
   2  * Copyright (c) 2011, 2018, 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 "memory/iterator.inline.hpp"
  30 #include "memory/oopFactory.hpp"
  31 #include "oops/instanceKlass.hpp"
  32 #include "oops/instanceMirrorKlass.hpp"
  33 #include "oops/instanceOop.hpp"
  34 #include "oops/oop.inline.hpp"
  35 #include "oops/symbol.hpp"
  36 #include "runtime/handles.inline.hpp"
  37 #include "utilities/macros.hpp"
  38 
  39 int InstanceMirrorKlass::_offset_of_static_fields = 0;
  40 
  41 int InstanceMirrorKlass::instance_size(Klass* k) {
  42   if (k != NULL && k->is_instance_klass()) {
  43     return align_object_size(size_helper() + InstanceKlass::cast(k)->static_field_size());
  44   }
  45   return size_helper();
  46 }
  47 
  48 instanceOop InstanceMirrorKlass::allocate_instance(Klass* k, TRAPS) {
  49   // Query before forming handle.
  50   int size = instance_size(k);
  51   assert(size > 0, "total object size must be positive: %d", size);
  52 
  53   // Since mirrors can be variable sized because of the static fields, store
  54   // the size in the mirror itself.
  55   instanceOop i = (instanceOop)Universe::heap()->class_allocate(this, size, CHECK_NULL);
  56   return i;
  57 }
  58 
  59 int InstanceMirrorKlass::oop_size(oop obj) const {
  60   return java_lang_Class::oop_size_raw(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 }
  70 
  71 #if INCLUDE_CDS
  72 void InstanceMirrorKlass::serialize_offsets(SerializeClosure* f) {
  73   f->do_u4((u4*)&_offset_of_static_fields);
  74 }
  75 #endif