1 /* 2 * Copyright (c) 2012, 2017, 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_SHARED_READ_WRITE_SIZE (NOT_LP64(6*M) LP64_ONLY(10*M)) 36 #define MIN_SHARED_READ_WRITE_SIZE (NOT_LP64(6*M) LP64_ONLY(10*M)) 37 38 #define DEFAULT_SHARED_READ_ONLY_SIZE (NOT_LP64(6*M) LP64_ONLY(10*M)) 39 #define MIN_SHARED_READ_ONLY_SIZE (NOT_LP64(6*M) LP64_ONLY(10*M)) 40 41 // the MIN_SHARED_MISC_DATA_SIZE and MIN_SHARED_MISC_CODE_SIZE estimates are based on 42 // the sizes required for dumping the archive using the default classlist. The sizes 43 // are multiplied by 1.5 for a safety margin. 44 45 #define DEFAULT_SHARED_MISC_DATA_SIZE (NOT_LP64(2*M) LP64_ONLY(4*M)) 46 #define MIN_SHARED_MISC_DATA_SIZE (NOT_LP64(1*M) LP64_ONLY(1200*K)) 47 48 #define DEFAULT_SHARED_MISC_CODE_SIZE (120*K) 49 #define MIN_SHARED_MISC_CODE_SIZE (NOT_LP64(63*K) LP64_ONLY(69*K)) 50 #define DEFAULT_COMBINED_SIZE (DEFAULT_SHARED_READ_WRITE_SIZE+DEFAULT_SHARED_READ_ONLY_SIZE+DEFAULT_SHARED_MISC_DATA_SIZE+DEFAULT_SHARED_MISC_CODE_SIZE) 51 52 // the max size is the MAX size (ie. 0x7FFFFFFF) - the total size of 53 // the other 3 sections - page size (to avoid overflow in case the final 54 // size will get aligned up on page size) 55 #define SHARED_PAGE ((size_t)os::vm_page_size()) 56 #define MAX_SHARED_DELTA (0x7FFFFFFF) 57 #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) 58 #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) 59 #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) 60 #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) 61 62 #define LargeSharedArchiveSize (300*M) 63 #define HugeSharedArchiveSize (800*M) 64 #define ReadOnlyRegionPercentage 0.4 65 #define ReadWriteRegionPercentage 0.55 66 #define MiscDataRegionPercentage 0.03 67 #define MiscCodeRegionPercentage 0.02 68 #define LargeThresholdClassCount 5000 69 #define HugeThresholdClassCount 40000 70 71 #define SET_ESTIMATED_SIZE(type, region) \ 72 Shared ##region## Size = FLAG_IS_DEFAULT(Shared ##region## Size) ? \ 73 (uintx)(type ## SharedArchiveSize * region ## RegionPercentage) : Shared ## region ## Size 74 75 class FileMapInfo; 76 77 class MetaspaceSharedStats VALUE_OBJ_CLASS_SPEC { 78 public: 79 MetaspaceSharedStats() { 80 memset(this, 0, sizeof(*this)); 81 } 82 CompactHashtableStats symbol; 83 CompactHashtableStats string; 84 }; 85 86 class SharedMiscRegion VALUE_OBJ_CLASS_SPEC { 87 private: 88 VirtualSpace _vs; 89 char* _alloc_top; 90 SharedSpaceType _space_type; 91 92 public: 93 void initialize(ReservedSpace rs, size_t committed_byte_size, SharedSpaceType space_type); 94 VirtualSpace* virtual_space() { 95 return &_vs; 96 } 97 char* low() const { 98 return _vs.low(); 99 } 100 char* alloc_top() const { 101 return _alloc_top; 102 } 103 char* alloc(size_t num_bytes) NOT_CDS_RETURN_(NULL); 104 }; 105 106 // Class Data Sharing Support 107 class MetaspaceShared : AllStatic { 108 109 // CDS support 110 static ReservedSpace* _shared_rs; 111 static int _max_alignment; 112 static MetaspaceSharedStats _stats; 113 static bool _link_classes_made_progress; 114 static bool _check_classes_made_progress; 115 static bool _has_error_classes; 116 static bool _archive_loading_failed; 117 static bool _remapped_readwrite; 118 static address _cds_i2i_entry_code_buffers; 119 static size_t _cds_i2i_entry_code_buffers_size; 120 121 // Used only during dumping. 122 static SharedMiscRegion _md; 123 static SharedMiscRegion _mc; 124 static SharedMiscRegion _od; 125 public: 126 enum { 127 ro = 0, // read-only shared space in the heap 128 rw = 1, // read-write shared space in the heap 129 md = 2, // miscellaneous data for initializing tables, etc. 130 mc = 3, // miscellaneous code - vtable replacement. 131 max_strings = 2, // max number of string regions in string space 132 num_non_strings = 4, // number of non-string regions 133 first_string = num_non_strings, // index of first string region 134 // The optional data region is the last region. 135 // Currently it only contains class file data. 136 od = max_strings + num_non_strings, 137 n_regions = od + 1 // total number of regions 138 }; 139 140 // Accessor functions to save shared space created for metadata, which has 141 // extra space allocated at the end for miscellaneous data and code. 142 static void set_max_alignment(int alignment) { 143 CDS_ONLY(_max_alignment = alignment); 144 } 145 146 static int max_alignment() { 147 CDS_ONLY(return _max_alignment); 148 NOT_CDS(return 0); 149 } 150 151 static void prepare_for_dumping() NOT_CDS_RETURN; 152 static void preload_and_dump(TRAPS) NOT_CDS_RETURN; 153 static int preload_and_dump(const char * class_list_path, 154 GrowableArray<Klass*>* class_promote_order, 155 TRAPS) NOT_CDS_RETURN_(0); 156 157 static ReservedSpace* shared_rs() { 158 CDS_ONLY(return _shared_rs); 159 NOT_CDS(return NULL); 160 } 161 162 static void initialize_shared_rs(ReservedSpace* rs) NOT_CDS_RETURN; 163 164 static void set_archive_loading_failed() { 165 _archive_loading_failed = true; 166 } 167 static bool map_shared_spaces(FileMapInfo* mapinfo) NOT_CDS_RETURN_(false); 168 static void initialize_shared_spaces() NOT_CDS_RETURN; 169 static void fixup_shared_string_regions() NOT_CDS_RETURN; 170 171 // Return true if given address is in the mapped shared space. 172 static bool is_in_shared_space(const void* p) NOT_CDS_RETURN_(false); 173 174 // Return true if given address is in the shared region corresponding to the idx 175 static bool is_in_shared_region(const void* p, int idx) NOT_CDS_RETURN_(false); 176 177 static bool is_string_region(int idx) NOT_CDS_RETURN_(false); 178 179 static intptr_t* allocate_cpp_vtable_clones(intptr_t* top, intptr_t* end); 180 static intptr_t* clone_cpp_vtables(intptr_t* p); 181 static void zero_cpp_vtable_clones_for_writing(); 182 static void patch_cpp_vtable_pointers(); 183 static bool is_valid_shared_method(const Method* m); 184 185 static void serialize(SerializeClosure* sc, GrowableArray<MemRegion> *string_space, 186 size_t* space_size); 187 188 static MetaspaceSharedStats* stats() { 189 return &_stats; 190 } 191 192 // JVM/TI RedefineClasses() support: 193 // Remap the shared readonly space to shared readwrite, private if 194 // sharing is enabled. Simply returns true if sharing is not enabled 195 // or if the remapping has already been done by a prior call. 196 static bool remap_shared_readonly_as_readwrite() NOT_CDS_RETURN_(true); 197 static bool remapped_readwrite() { 198 CDS_ONLY(return _remapped_readwrite); 199 NOT_CDS(return false); 200 } 201 202 static void print_shared_spaces(); 203 204 static bool try_link_class(InstanceKlass* ik, TRAPS); 205 static void link_one_shared_class(Klass* obj, TRAPS); 206 static void check_one_shared_class(Klass* obj); 207 static void check_shared_class_loader_type(Klass* obj); 208 static void link_and_cleanup_shared_classes(TRAPS); 209 210 static int count_class(const char* classlist_file); 211 static void estimate_regions_size() NOT_CDS_RETURN; 212 213 // Allocate a block of memory from the "mc", "md", or "od" regions. 214 static char* misc_code_space_alloc(size_t num_bytes) { return _mc.alloc(num_bytes); } 215 static char* misc_data_space_alloc(size_t num_bytes) { return _md.alloc(num_bytes); } 216 static char* optional_data_space_alloc(size_t num_bytes) { return _od.alloc(num_bytes); } 217 218 static address cds_i2i_entry_code_buffers(size_t total_size); 219 220 static address cds_i2i_entry_code_buffers() { 221 return _cds_i2i_entry_code_buffers; 222 } 223 static size_t cds_i2i_entry_code_buffers_size() { 224 return _cds_i2i_entry_code_buffers_size; 225 } 226 227 static SharedMiscRegion* misc_code_region() { 228 assert(DumpSharedSpaces, "used during dumping only"); 229 return &_mc; 230 } 231 static SharedMiscRegion* misc_data_region() { 232 assert(DumpSharedSpaces, "used during dumping only"); 233 return &_md; 234 } 235 static SharedMiscRegion* optional_data_region() { 236 assert(DumpSharedSpaces, "used during dumping only"); 237 return &_od; 238 } 239 }; 240 #endif // SHARE_VM_MEMORY_METASPACESHARED_HPP