1 /* 2 * Copyright (c) 2012, 2015, 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_METASPACESHARED_HPP 26 #define SHARE_VM_MEMORY_METASPACESHARED_HPP 27 28 #include "classfile/compactHashtable.hpp" 29 #include "memory/allocation.hpp" 30 #include "memory/memRegion.hpp" 31 #include "memory/virtualspace.hpp" 32 #include "utilities/exceptions.hpp" 33 #include "utilities/macros.hpp" 34 35 #define DEFAULT_VTBL_LIST_SIZE (17) // number of entries in the shared space vtable list. 36 #define DEFAULT_VTBL_VIRTUALS_COUNT (200) // maximum number of virtual functions 37 // If virtual functions are added to Metadata, 38 // this number needs to be increased. Also, 39 // SharedMiscCodeSize will need to be increased. 40 // The following 2 sizes were based on 41 // MetaspaceShared::generate_vtable_methods() 42 #define DEFAULT_VTBL_METHOD_SIZE (16) // conservative size of the mov1 and jmp instructions 43 // for the x64 platform 44 #define DEFAULT_VTBL_COMMON_CODE_SIZE (1*K) // conservative size of the "common_code" for the x64 platform 45 46 #define DEFAULT_SHARED_READ_WRITE_SIZE (NOT_LP64(12*M) LP64_ONLY(16*M)) 47 #define MIN_SHARED_READ_WRITE_SIZE (NOT_LP64(7*M) LP64_ONLY(12*M)) 48 49 #define DEFAULT_SHARED_READ_ONLY_SIZE (NOT_LP64(12*M) LP64_ONLY(16*M)) 50 #define MIN_SHARED_READ_ONLY_SIZE (NOT_LP64(8*M) LP64_ONLY(9*M)) 51 52 // the MIN_SHARED_MISC_DATA_SIZE and MIN_SHARED_MISC_CODE_SIZE estimates are based on 53 // MetaspaceShared::generate_vtable_methods(). 54 // The minimum size only accounts for the vtable methods. Any size less than the 55 // minimum required size would cause vm crash when allocating the vtable methods. 56 #define SHARED_MISC_SIZE_FOR(size) (DEFAULT_VTBL_VIRTUALS_COUNT*DEFAULT_VTBL_LIST_SIZE*size) 57 58 #define DEFAULT_SHARED_MISC_DATA_SIZE (NOT_LP64(2*M) LP64_ONLY(4*M)) 59 #define MIN_SHARED_MISC_DATA_SIZE (SHARED_MISC_SIZE_FOR(sizeof(void*))) 60 61 #define DEFAULT_SHARED_MISC_CODE_SIZE (120*K) 62 #define MIN_SHARED_MISC_CODE_SIZE (SHARED_MISC_SIZE_FOR(sizeof(void*))+SHARED_MISC_SIZE_FOR(DEFAULT_VTBL_METHOD_SIZE)+DEFAULT_VTBL_COMMON_CODE_SIZE) 63 64 #define DEFAULT_COMBINED_SIZE (DEFAULT_SHARED_READ_WRITE_SIZE+DEFAULT_SHARED_READ_ONLY_SIZE+DEFAULT_SHARED_MISC_DATA_SIZE+DEFAULT_SHARED_MISC_CODE_SIZE) 65 66 // the max size is the MAX size (ie. 0x7FFFFFFF) - the total size of 67 // the other 3 sections - page size (to avoid overflow in case the final 68 // size will get aligned up on page size) 69 #define SHARED_PAGE ((size_t)os::vm_page_size()) 70 #define MAX_SHARED_DELTA (0x7FFFFFFF) 71 #define MAX_SHARED_READ_WRITE_SIZE (MAX_SHARED_DELTA-(MIN_SHARED_READ_ONLY_SIZE+MIN_SHARED_MISC_DATA_SIZE+MIN_SHARED_MISC_CODE_SIZE)-SHARED_PAGE) 72 #define MAX_SHARED_READ_ONLY_SIZE (MAX_SHARED_DELTA-(MIN_SHARED_READ_WRITE_SIZE+MIN_SHARED_MISC_DATA_SIZE+MIN_SHARED_MISC_CODE_SIZE)-SHARED_PAGE) 73 #define MAX_SHARED_MISC_DATA_SIZE (MAX_SHARED_DELTA-(MIN_SHARED_READ_WRITE_SIZE+MIN_SHARED_READ_ONLY_SIZE+MIN_SHARED_MISC_CODE_SIZE)-SHARED_PAGE) 74 #define MAX_SHARED_MISC_CODE_SIZE (MAX_SHARED_DELTA-(MIN_SHARED_READ_WRITE_SIZE+MIN_SHARED_READ_ONLY_SIZE+MIN_SHARED_MISC_DATA_SIZE)-SHARED_PAGE) 75 76 #define LargeSharedArchiveSize (300*M) 77 #define HugeSharedArchiveSize (800*M) 78 #define ReadOnlyRegionPercentage 0.4 79 #define ReadWriteRegionPercentage 0.55 80 #define MiscDataRegionPercentage 0.03 81 #define MiscCodeRegionPercentage 0.02 82 #define LargeThresholdClassCount 5000 83 #define HugeThresholdClassCount 40000 84 85 #define SET_ESTIMATED_SIZE(type, region) \ 86 Shared ##region## Size = FLAG_IS_DEFAULT(Shared ##region## Size) ? \ 87 (uintx)(type ## SharedArchiveSize * region ## RegionPercentage) : Shared ## region ## Size 88 89 class FileMapInfo; 90 91 class MetaspaceSharedStats VALUE_OBJ_CLASS_SPEC { 92 public: 93 MetaspaceSharedStats() { 94 memset(this, 0, sizeof(*this)); 95 } 96 CompactHashtableStats symbol; 97 CompactHashtableStats string; 98 }; 99 100 // Class Data Sharing Support 101 class MetaspaceShared : AllStatic { 102 103 // CDS support 104 static ReservedSpace* _shared_rs; 105 static int _max_alignment; 106 static MetaspaceSharedStats _stats; 107 static bool _link_classes_made_progress; 108 static bool _check_classes_made_progress; 109 static bool _has_error_classes; 110 static bool _archive_loading_failed; 111 public: 112 enum { 113 vtbl_list_size = DEFAULT_VTBL_LIST_SIZE, 114 num_virtuals = DEFAULT_VTBL_VIRTUALS_COUNT, 115 vtbl_method_size = DEFAULT_VTBL_METHOD_SIZE, 116 vtbl_common_code_size = DEFAULT_VTBL_COMMON_CODE_SIZE 117 }; 118 119 enum { 120 ro = 0, // read-only shared space in the heap 121 rw = 1, // read-write shared space in the heap 122 md = 2, // miscellaneous data for initializing tables, etc. 123 mc = 3, // miscellaneous code - vtable replacement. 124 max_strings = 2, // max number of string regions in string space 125 num_non_strings = 4, // number of non-string regions 126 first_string = num_non_strings, // index of first string region 127 n_regions = max_strings + num_non_strings // total number of regions 128 }; 129 130 // Accessor functions to save shared space created for metadata, which has 131 // extra space allocated at the end for miscellaneous data and code. 132 static void set_max_alignment(int alignment) { 133 CDS_ONLY(_max_alignment = alignment); 134 } 135 136 static int max_alignment() { 137 CDS_ONLY(return _max_alignment); 138 NOT_CDS(return 0); 139 } 140 141 static void prepare_for_dumping() NOT_CDS_RETURN; 142 static void preload_and_dump(TRAPS) NOT_CDS_RETURN; 143 static int preload_and_dump(const char * class_list_path, 144 GrowableArray<Klass*>* class_promote_order, 145 TRAPS) NOT_CDS_RETURN_(0); 146 147 static ReservedSpace* shared_rs() { 148 CDS_ONLY(return _shared_rs); 149 NOT_CDS(return NULL); 150 } 151 152 static void set_shared_rs(ReservedSpace* rs) { 153 CDS_ONLY(_shared_rs = rs;) 154 } 155 156 static void set_archive_loading_failed() { 157 _archive_loading_failed = true; 158 } 159 static bool map_shared_spaces(FileMapInfo* mapinfo) NOT_CDS_RETURN_(false); 160 static void initialize_shared_spaces() NOT_CDS_RETURN; 161 static void fixup_shared_string_regions() NOT_CDS_RETURN; 162 163 // Return true if given address is in the mapped shared space. 164 static bool is_in_shared_space(const void* p) NOT_CDS_RETURN_(false); 165 166 static bool is_string_region(int idx) NOT_CDS_RETURN_(false); 167 168 static void generate_vtable_methods(void** vtbl_list, 169 void** vtable, 170 char** md_top, char* md_end, 171 char** mc_top, char* mc_end); 172 static void serialize(SerializeClosure* sc); 173 174 static MetaspaceSharedStats* stats() { 175 return &_stats; 176 } 177 178 // JVM/TI RedefineClasses() support: 179 // Remap the shared readonly space to shared readwrite, private if 180 // sharing is enabled. Simply returns true if sharing is not enabled 181 // or if the remapping has already been done by a prior call. 182 static bool remap_shared_readonly_as_readwrite() NOT_CDS_RETURN_(true); 183 184 static void print_shared_spaces(); 185 186 static bool try_link_class(InstanceKlass* ik, TRAPS); 187 static void link_one_shared_class(Klass* obj, TRAPS); 188 static void check_one_shared_class(Klass* obj); 189 static void link_and_cleanup_shared_classes(TRAPS); 190 191 static int count_class(const char* classlist_file); 192 static void estimate_regions_size() NOT_CDS_RETURN; 193 }; 194 #endif // SHARE_VM_MEMORY_METASPACESHARED_HPP