jdk8-mips64-public/hotspot: src/share/vm/oops/instanceOop.hpp@8e47bac5643a

7054512: Compress class pointers after perm gen removal
Summary: support of compress class pointers in the compilers.
Reviewed-by: kvn, twisti

     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

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    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     // offset computation code breaks if UseCompressedKlassPointers

    41     // only is true

    42     return (UseCompressedOops && UseCompressedKlassPointers) ?

    43              klass_gap_offset_in_bytes() :

    44              sizeof(instanceOopDesc);

    45   }

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

    48     int base_in_bytes = base_offset_in_bytes();

    49     return (offset >= base_in_bytes &&

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

    51   }

    52 };

    54 #endif // SHARE_VM_OOPS_INSTANCEOOP_HPP

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