66 lines
2.6 KiB
C
66 lines
2.6 KiB
C
/*
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* Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef SHARE_INCLUDE_CDS_H
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#define SHARE_INCLUDE_CDS_H
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// This file declares the CDS data structures that are used by the HotSpot Serviceability Agent
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// (see C sources inside src/jdk.hotspot.agent).
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//
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// We should use only standard C types. Do not use custom types such as bool, intx,
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// etc, to avoid introducing unnecessary dependencies to other HotSpot type declarations.
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//
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// Also, this is a C header file. Do not use C++ here.
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#define NUM_CDS_REGIONS 9
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#define CDS_ARCHIVE_MAGIC 0xf00baba2
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#define CURRENT_CDS_ARCHIVE_VERSION 5
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#define INVALID_CDS_ARCHIVE_VERSION -1
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struct CDSFileMapRegion {
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int _crc; // crc checksum of the current space
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size_t _file_offset; // sizeof(this) rounded to vm page size
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union {
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char* _base; // copy-on-write base address
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size_t _offset; // offset from the compressed oop encoding base, only used
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// by archive heap space
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} _addr;
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size_t _used; // for setting space top on read
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int _read_only; // read only space?
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int _allow_exec; // executable code in space?
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void* _oopmap; // bitmap for relocating embedded oops
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size_t _oopmap_size_in_bits;
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};
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struct CDSFileMapHeaderBase {
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unsigned int _magic; // identify file type
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int _crc; // header crc checksum
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int _version; // must be CURRENT_CDS_ARCHIVE_VERSION
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struct CDSFileMapRegion _space[NUM_CDS_REGIONS];
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};
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typedef struct CDSFileMapHeaderBase CDSFileMapHeaderBase;
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#endif // SHARE_INCLUDE_CDS_H
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