Quellcode-Bibliothek

^© Kompilation durch diese Firma

[Weder Korrektheit noch Funktionsfähigkeit der Software werden zugesichert.]

Datei: cds.h Sprache: C

/*
* Copyright (c) 2018, 2022, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/

#ifndef SHARE_INCLUDE_CDS_H
#define SHARE_INCLUDE_CDS_H

#include <stddef.h>

// This file declares the CDS data structures that are used by the HotSpot Serviceability Agent
// (see C sources inside src/jdk.hotspot.agent).
//
// We should use only standard C types. Do not use custom types such as bool, intx,
// etc, to avoid introducing unnecessary dependencies to other HotSpot type declarations.
//
// Also, this is a C header file. Do not use C++ here.

#define NUM_CDS_REGIONS 7 // this must be the same as MetaspaceShared::n_regions
#define CDS_ARCHIVE_MAGIC 0xf00baba2
#define CDS_DYNAMIC_ARCHIVE_MAGIC 0xf00baba8
#define CDS_GENERIC_HEADER_SUPPORTED_MIN_VERSION 13
#define CURRENT_CDS_ARCHIVE_VERSION 17

typedef struct CDSFileMapRegion {
  int     _crc;               // CRC checksum of this region.
  int     _read_only;         // read only region?
  int     _allow_exec;        // executable code in this region?
  int     _is_heap_region;    // Used by SA and debug build.
  int     _is_bitmap_region;  // Relocation bitmap for RO/RW regions (used by SA and debug build).
  int     _mapped_from_file;  // Is this region mapped from a file?
                              // If false, this region was initialized using ::read().
  size_t  _file_offset;       // Data for this region starts at this offset in the archive file.
  size_t  _mapping_offset;    // This encodes the requested address for this region to be mapped at runtime.
                              // However, the JVM may choose to map at an alternative location (e.g., for ASLR,
                              // or to adapt to the available ranges in the Java heap range).
                              // - For an RO/RW region, the requested address is:
                              //     FileMapHeader::requested_base_address() + _mapping_offset
                              // - For a heap region, the requested address is:
                              //     +UseCompressedOops: /*runtime*/ CompressedOops::base() + _mapping_offset
                              //     -UseCompressedOops: FileMapHeader::heap_begin() + _mapping_offset
                              //     See FileMapInfo::heap_region_requested_address().
                              // - For bitmap regions, the _mapping_offset is always zero. The runtime address
                              //   is picked by the OS.
  size_t  _used;              // Number of bytes actually used by this region (excluding padding bytes added
                              // for alignment purposed.
  size_t  _oopmap_offset;     // Bitmap for relocating oop fields in archived heap objects.
                              // (The base address is the bottom of the BM region)
  size_t  _oopmap_size_in_bits;
  size_t  _ptrmap_offset;     // Bitmap for relocating native pointer fields in archived heap objects.
                              // (The base address is the bottom of the BM region).
  size_t  _ptrmap_size_in_bits;
  char*   _mapped_base;       // Actually mapped address (NULL if this region is not mapped).
} CDSFileMapRegion;

// This portion of the archive file header must remain unchanged for
// _version >= CDS_GENERIC_HEADER_SUPPORTED_MIN_VERSION (13).
// This makes it possible to read important information from a CDS archive created by
// a different version of HotSpot, so that we can automatically regenerate the archive as necessary.
typedef struct GenericCDSFileMapHeader {
  unsigned int _magic;                    // identification of file type
  int          _crc;                      // header crc checksum, start from _base_archive_name_offset
  int          _version;                  // CURRENT_CDS_ARCHIVE_VERSION of the jdk that dumped the this archive
  unsigned int _header_size;              // total size of the header, in bytes
  unsigned int _base_archive_name_offset; // offset where the base archive name is stored
                                          //   static archive:  0
                                          //   dynamic archive:
                                          //     0 for default base archive
                                          //     non-zero for non-default base archive
                                          //       (char*)this + _base_archive_name_offset
                                          //       points to a 0-terminated string for the base archive name
  unsigned int _base_archive_name_size;   // size of base archive name including ending '\0'
                                          //   static:  0
                                          //   dynamic:
                                          //     0 for default base archive
                                          //     non-zero for non-default base archive

} GenericCDSFileMapHeader;

// This type is used by the Serviceability Agent to access the contents of
// a memory-mapped CDS archive.
typedef struct CDSFileMapHeaderBase {
  // We cannot inherit from GenericCDSFileMapHeader as this type may be used
  // by both C and C++ code.
  GenericCDSFileMapHeader _generic_header;
  CDSFileMapRegion _regions[NUM_CDS_REGIONS];
} CDSFileMapHeaderBase;

#endif // SHARE_INCLUDE_CDS_H

¤ Dauer der Verarbeitung: 0.21 Sekunden (vorverarbeitet) ¤

Download des Quellennavigators
Download des sprechenden Kalenders
in der Quellcodebibliothek suchen

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.