1 /* 2 * Copyright (c) 2001, 2010, 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 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_MEMORY_GENERATIONSPEC_HPP 26 #define SHARE_VM_MEMORY_GENERATIONSPEC_HPP 27 28 #include "memory/generation.hpp" 29 #include "memory/permGen.hpp" 30 31 // The specification of a generation. This class also encapsulates 32 // some generation-specific behavior. This is done here rather than as a 33 // virtual function of Generation because these methods are needed in 34 // initialization of the Generations. 35 class GenerationSpec : public CHeapObj { 36 friend class VMStructs; 37 private: 38 Generation::Name _name; 39 size_t _init_size; 40 size_t _max_size; 41 42 public: 43 GenerationSpec(Generation::Name name, size_t init_size, size_t max_size) { 44 _name = name; 45 _init_size = init_size; 46 _max_size = max_size; 47 } 48 49 Generation* init(ReservedSpace rs, int level, GenRemSet* remset); 50 51 // Accessors 52 Generation::Name name() const { return _name; } 53 size_t init_size() const { return _init_size; } 54 void set_init_size(size_t size) { _init_size = size; } 55 size_t max_size() const { return _max_size; } 56 void set_max_size(size_t size) { _max_size = size; } 57 58 // Alignment 59 void align(size_t alignment) { 60 set_init_size(align_size_up(init_size(), alignment)); 61 set_max_size(align_size_up(max_size(), alignment)); 62 } 63 64 // Return the number of regions contained in the generation which 65 // might need to be independently covered by a remembered set. 66 virtual int n_covered_regions() const { return 1; } 67 }; 68 69 typedef GenerationSpec* GenerationSpecPtr; 70 71 // The specification of a permanent generation. This class is very 72 // similar to GenerationSpec in use. Due to PermGen's not being a 73 // true Generation, we cannot combine the spec classes either. 74 class PermanentGenerationSpec : public CHeapObj { 75 friend class VMStructs; 76 private: 77 PermGen::Name _name; 78 size_t _init_size; 79 size_t _max_size; 80 size_t _read_only_size; 81 size_t _read_write_size; 82 size_t _misc_data_size; 83 size_t _misc_code_size; 84 bool _enable_shared_spaces; 85 86 enum { 87 _n_spaces = 2 88 }; 89 90 public: 91 PermanentGenerationSpec(PermGen::Name name, size_t init_size, 92 size_t max_size, size_t read_only_size, 93 size_t read_write_size, size_t misc_data_size, 94 size_t misc_code_size); 95 96 PermGen* init(ReservedSpace rs, size_t init_size, GenRemSet* remset); 97 98 void disable_sharing() { 99 _enable_shared_spaces = false; 100 _read_only_size = 0; 101 _read_write_size = 0; 102 _misc_data_size = 0; 103 _misc_code_size = 0; 104 } 105 106 // Accessors 107 PermGen::Name name() const { return _name; } 108 size_t init_size() const { return _init_size; } 109 void set_init_size(size_t size) { _init_size = size; } 110 111 // Max size for user DOES NOT include shared spaces. 112 // Max size for space allocation DOES include shared spaces. 113 size_t max_size() const { 114 return _max_size + _read_only_size + _read_write_size; 115 } 116 117 // Need one covered region for the main space, and one for the shared 118 // spaces (together). 119 int n_covered_regions() const { return 2; } 120 121 void align(size_t alignment); 122 123 size_t read_only_size() const { return _read_only_size; } 124 size_t read_write_size() const { return _read_write_size; } 125 size_t misc_data_size() const { return _misc_data_size; } 126 size_t misc_code_size() const { return _misc_code_size; } 127 bool enable_shared_spaces() const { return _enable_shared_spaces; } 128 }; 129 130 #endif // SHARE_VM_MEMORY_GENERATIONSPEC_HPP