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annotate src/share/vm/memory/metaspaceShared.hpp @ 6725:da91efe96a93

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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>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
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children fb19af007ffc
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1 /*
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2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24 #ifndef SHARE_VM_MEMORY_METASPACE_SHARED_HPP
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25 #define SHARE_VM_MEMORY_METASPACE_SHARED_HPP
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26
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27 #include "memory/allocation.hpp"
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28 #include "memory/memRegion.hpp"
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29 #include "runtime/virtualspace.hpp"
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30 #include "utilities/exceptions.hpp"
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31 #include "utilities/macros.hpp"
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32
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33 class FileMapInfo;
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34
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35 // Class Data Sharing Support
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36 class MetaspaceShared : AllStatic {
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37
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38 // CDS support
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39 static ReservedSpace* _shared_rs;
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40 static int _max_alignment;
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41
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42 public:
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43 enum {
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44 vtbl_list_size = 17, // number of entries in the shared space vtable list.
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45 num_virtuals = 200 // maximum number of virtual functions
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46 // If virtual functions are added to Metadata,
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47 // this number needs to be increased. Also,
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48 // SharedMiscCodeSize will need to be increased.
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49 };
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50
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51 enum {
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52 ro = 0, // read-only shared space in the heap
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53 rw = 1, // read-write shared space in the heap
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54 md = 2, // miscellaneous data for initializing tables, etc.
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55 mc = 3, // miscellaneous code - vtable replacement.
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56 n_regions = 4
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57 };
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58
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59 static void set_max_alignment(int alignment) KERNEL_RETURN;
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60 static int max_alignment() KERNEL_RETURN_(0);
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61
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62 static void preload_and_dump(TRAPS) KERNEL_RETURN;
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63 static ReservedSpace* shared_rs();
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64 static void set_shared_rs(ReservedSpace* rs) KERNEL_RETURN;
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65
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66 static bool map_shared_spaces(FileMapInfo* mapinfo) KERNEL_RETURN_(false);
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67 static void initialize_shared_spaces() KERNEL_RETURN;
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68
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69 // Return true if given address is in the mapped shared space.
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70 static bool is_in_shared_space(const void* p) KERNEL_RETURN_(false);
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71
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72 static void generate_vtable_methods(void** vtbl_list,
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73 void** vtable,
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74 char** md_top, char* md_end,
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75 char** mc_top, char* mc_end);
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76 static void serialize(SerializeClosure* sc);
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77
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78 // JVM/TI RedefineClasses() support:
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79 // Remap the shared readonly space to shared readwrite, private if
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80 // sharing is enabled. Simply returns true if sharing is not enabled
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81 // or if the remapping has already been done by a prior call.
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82 static bool remap_shared_readonly_as_readwrite() KERNEL_RETURN_(true);
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83
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84 static void print_shared_spaces();
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85 };
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86 #endif // SHARE_VM_MEMORY_METASPACE_SHARED_HPP