jdk8-mips64-public/hotspot: src/share/vm/oops/instanceOop.hpp@da91efe96a93

6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>

     1 /*

     2  * Copyright (c) 1997, 2012, 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  */

    25 #ifndef SHARE_VM_OOPS_INSTANCEOOP_HPP

    26 #define SHARE_VM_OOPS_INSTANCEOOP_HPP

    28 #include "oops/oop.hpp"

    30 // An instanceOop is an instance of a Java Class

    31 // Evaluating "new HashTable()" will create an instanceOop.

    33 class instanceOopDesc : public oopDesc {

    34  public:

    35   // aligned header size.

    36   static int header_size() { return sizeof(instanceOopDesc)/HeapWordSize; }

    38   // If compressed, the offset of the fields of the instance may not be aligned.

    39   static int base_offset_in_bytes() {

    40     return UseCompressedKlassPointers ?

    41              klass_gap_offset_in_bytes() :

    42              sizeof(instanceOopDesc);

    43   }

    45   static bool contains_field_offset(int offset, int nonstatic_field_size) {

    46     int base_in_bytes = base_offset_in_bytes();

    47     return (offset >= base_in_bytes &&

    48             (offset-base_in_bytes) < nonstatic_field_size * heapOopSize);

    49   }

    50 };

    52 #endif // SHARE_VM_OOPS_INSTANCEOOP_HPP

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

src/share/vm/oops/instanceOop.hpp@da91efe96a93

src/share/vm/oops/instanceOop.hpp