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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 |