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 LargeSharedArchiveSize (300*M) 36 #define HugeSharedArchiveSize (800*M) 37 #define ReadOnlyRegionPercentage 0.4 38 #define ReadWriteRegionPercentage 0.55 39 #define MiscDataRegionPercentage 0.03 40 #define MiscCodeRegionPercentage 0.02 41 #define LargeThresholdClassCount 5000 42 #define HugeThresholdClassCount 40000 43 44 #define SET_ESTIMATED_SIZE(type, region) \ 45 Shared ##region## Size = FLAG_IS_DEFAULT(Shared ##region## Size) ? \ 46 (uintx)(type ## SharedArchiveSize * region ## RegionPercentage) : Shared ## region ## Size 47 48 class FileMapInfo; 49 50 class MetaspaceSharedStats VALUE_OBJ_CLASS_SPEC { 51 public: 52 MetaspaceSharedStats() { 53 memset(this, 0, sizeof(*this)); 54 } 55 CompactHashtableStats symbol; 56 }; 57 58 // Class Data Sharing Support 59 class MetaspaceShared : AllStatic { 60 61 // CDS support 62 static ReservedSpace* _shared_rs; 63 static int _max_alignment; 64 static MetaspaceSharedStats _stats; 65 static bool _link_classes_made_progress; 66 static bool _check_classes_made_progress; 67 static bool _has_error_classes; 68 static bool _archive_loading_failed; 69 public: 70 enum { 71 vtbl_list_size = 17, // number of entries in the shared space vtable list. 72 num_virtuals = 200, // maximum number of virtual functions 73 // If virtual functions are added to Metadata, 74 // this number needs to be increased. Also, 75 // SharedMiscCodeSize will need to be increased. 76 // The following 2 sizes were based on 77 // MetaspaceShared::generate_vtable_methods() 78 vtbl_method_size = 16, // conservative size of the mov1 and jmp instructions 79 // for the x64 platform 80 vtbl_common_code_size = (1*K) // conservative size of the "common_code" for the x64 platform 81 }; 82 83 enum { 84 min_ro_size = NOT_LP64(8*M) LP64_ONLY(9*M), // minimum ro and rw regions sizes based on dumping 85 min_rw_size = NOT_LP64(7*M) LP64_ONLY(12*M) // of a shared archive using the default classlist 86 }; 87 88 enum { 89 ro = 0, // read-only shared space in the heap 90 rw = 1, // read-write shared space in the heap 91 md = 2, // miscellaneous data for initializing tables, etc. 92 mc = 3, // miscellaneous code - vtable replacement. 93 n_regions = 4 94 }; 95 96 // Accessor functions to save shared space created for metadata, which has 97 // extra space allocated at the end for miscellaneous data and code. 98 static void set_max_alignment(int alignment) { 99 CDS_ONLY(_max_alignment = alignment); 100 } 101 102 static int max_alignment() { 103 CDS_ONLY(return _max_alignment); 104 NOT_CDS(return 0); 105 } 106 107 static void prepare_for_dumping() NOT_CDS_RETURN; 108 static void preload_and_dump(TRAPS) NOT_CDS_RETURN; 109 static int preload_and_dump(const char * class_list_path, 110 GrowableArray<Klass*>* class_promote_order, 111 TRAPS) NOT_CDS_RETURN_(0); 112 113 static ReservedSpace* shared_rs() { 114 CDS_ONLY(return _shared_rs); 115 NOT_CDS(return NULL); 116 } 117 118 static void set_shared_rs(ReservedSpace* rs) { 119 CDS_ONLY(_shared_rs = rs;) 120 } 121 122 static void set_archive_loading_failed() { 123 _archive_loading_failed = true; 124 } 125 static bool map_shared_spaces(FileMapInfo* mapinfo) NOT_CDS_RETURN_(false); 126 static void initialize_shared_spaces() NOT_CDS_RETURN; 127 128 // Return true if given address is in the mapped shared space. 129 static bool is_in_shared_space(const void* p) NOT_CDS_RETURN_(false); 130 131 static void generate_vtable_methods(void** vtbl_list, 132 void** vtable, 133 char** md_top, char* md_end, 134 char** mc_top, char* mc_end); 135 static void serialize(SerializeClosure* sc); 136 137 static MetaspaceSharedStats* stats() { 138 return &_stats; 139 } 140 141 // JVM/TI RedefineClasses() support: 142 // Remap the shared readonly space to shared readwrite, private if 143 // sharing is enabled. Simply returns true if sharing is not enabled 144 // or if the remapping has already been done by a prior call. 145 static bool remap_shared_readonly_as_readwrite() NOT_CDS_RETURN_(true); 146 147 static void print_shared_spaces(); 148 149 static bool try_link_class(InstanceKlass* ik, TRAPS); 150 static void link_one_shared_class(Klass* obj, TRAPS); 151 static void check_one_shared_class(Klass* obj); 152 static void link_and_cleanup_shared_classes(TRAPS); 153 154 static int count_class(const char* classlist_file); 155 static void estimate_regions_size() NOT_CDS_RETURN; 156 }; 157 #endif // SHARE_VM_MEMORY_METASPACESHARED_HPP