1 /* 2 * Copyright (c) 2012, 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 #ifndef SHARE_VM_MEMORY_METASPACE_SHARED_HPP 25 #define SHARE_VM_MEMORY_METASPACE_SHARED_HPP 26 27 #include "classfile/compactHashtable.hpp" 28 #include "memory/allocation.hpp" 29 #include "memory/memRegion.hpp" 30 #include "runtime/virtualspace.hpp" 31 #include "utilities/exceptions.hpp" 32 #include "utilities/macros.hpp" 33 34 #define LargeSharedArchiveSize (300*M) 35 #define HugeSharedArchiveSize (800*M) 36 #define ReadOnlyRegionPercentage 0.4 37 #define ReadWriteRegionPercentage 0.55 38 #define MiscDataRegionPercentage 0.03 39 #define MiscCodeRegionPercentage 0.02 40 #define LargeThresholdClassCount 5000 41 #define HugeThresholdClassCount 40000 42 43 #define SET_ESTIMATED_SIZE(type, region) \ 44 Shared ##region## Size = FLAG_IS_DEFAULT(Shared ##region## Size) ? \ 45 (uintx)(type ## SharedArchiveSize * region ## RegionPercentage) : Shared ## region ## Size 46 47 class FileMapInfo; 48 49 class MetaspaceSharedStats VALUE_OBJ_CLASS_SPEC { 50 public: 51 MetaspaceSharedStats() { 52 memset(this, 0, sizeof(*this)); 53 } 54 CompactHashtableStats symbol; 55 }; 56 57 // Class Data Sharing Support 58 class MetaspaceShared : AllStatic { 59 60 // CDS support 61 static ReservedSpace* _shared_rs; 62 static int _max_alignment; 63 static MetaspaceSharedStats _stats; 64 static bool _link_classes_made_progress; 65 static bool _check_classes_made_progress; 66 static bool _has_error_classes; 67 static bool _archive_loading_failed; 68 public: 69 enum { 70 vtbl_list_size = 17, // number of entries in the shared space vtable list. 71 num_virtuals = 200, // maximum number of virtual functions 72 // If virtual functions are added to Metadata, 73 // this number needs to be increased. Also, 74 // SharedMiscCodeSize will need to be increased. 75 // The following 2 sizes were based on 76 // MetaspaceShared::generate_vtable_methods() 77 vtbl_method_size = 16, // conservative size of the mov1 and jmp instructions 78 // for the x64 platform 79 vtbl_common_code_size = (1*K) // conservative size of the "common_code" for the x64 platform 80 }; 81 82 enum { 83 min_ro_size = NOT_LP64(8*M) LP64_ONLY(9*M), // minimum ro and rw regions sizes based on dumping 84 min_rw_size = NOT_LP64(7*M) LP64_ONLY(12*M) // of a shared archive using the default classlist 85 }; 86 87 enum { 88 ro = 0, // read-only shared space in the heap 89 rw = 1, // read-write shared space in the heap 90 md = 2, // miscellaneous data for initializing tables, etc. 91 mc = 3, // miscellaneous code - vtable replacement. 92 n_regions = 4 93 }; 94 95 // Accessor functions to save shared space created for metadata, which has 96 // extra space allocated at the end for miscellaneous data and code. 97 static void set_max_alignment(int alignment) { 98 CDS_ONLY(_max_alignment = alignment); 99 } 100 101 static int max_alignment() { 102 CDS_ONLY(return _max_alignment); 103 NOT_CDS(return 0); 104 } 105 106 static void prepare_for_dumping() NOT_CDS_RETURN; 107 static void preload_and_dump(TRAPS) NOT_CDS_RETURN; 108 static int preload_and_dump(const char * class_list_path, 109 GrowableArray<Klass*>* class_promote_order, 110 TRAPS) NOT_CDS_RETURN_(0); 111 112 static ReservedSpace* shared_rs() { 113 CDS_ONLY(return _shared_rs); 114 NOT_CDS(return NULL); 115 } 116 117 static void set_shared_rs(ReservedSpace* rs) { 118 CDS_ONLY(_shared_rs = rs;) 119 } 120 121 static void set_archive_loading_failed() { 122 _archive_loading_failed = true; 123 } 124 static bool map_shared_spaces(FileMapInfo* mapinfo) NOT_CDS_RETURN_(false); 125 static void initialize_shared_spaces() NOT_CDS_RETURN; 126 127 // Return true if given address is in the mapped shared space. 128 static bool is_in_shared_space(const void* p) NOT_CDS_RETURN_(false); 129 130 static void generate_vtable_methods(void** vtbl_list, 131 void** vtable, 132 char** md_top, char* md_end, 133 char** mc_top, char* mc_end); 134 static void serialize(SerializeClosure* sc); 135 136 static MetaspaceSharedStats* stats() { 137 return &_stats; 138 } 139 140 // JVM/TI RedefineClasses() support: 141 // Remap the shared readonly space to shared readwrite, private if 142 // sharing is enabled. Simply returns true if sharing is not enabled 143 // or if the remapping has already been done by a prior call. 144 static bool remap_shared_readonly_as_readwrite() NOT_CDS_RETURN_(true); 145 146 static void print_shared_spaces(); 147 148 static bool try_link_class(InstanceKlass* ik, TRAPS); 149 static void link_one_shared_class(Klass* obj, TRAPS); 150 static void check_one_shared_class(Klass* obj); 151 static void link_and_cleanup_shared_classes(TRAPS); 152 153 static int count_class(const char* classlist_file); 154 static void estimate_regions_size() NOT_CDS_RETURN; 155 }; 156 #endif // SHARE_VM_MEMORY_METASPACE_SHARED_HPP