1 /* 2 * Copyright (c) 2018, 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_HEAPSHARED_HPP 26 #define SHARE_VM_MEMORY_HEAPSHARED_HPP 27 28 #include "classfile/systemDictionary.hpp" 29 #include "memory/universe.hpp" 30 #include "oops/objArrayKlass.hpp" 31 #include "oops/oop.hpp" 32 #include "oops/typeArrayKlass.hpp" 33 #include "utilities/growableArray.hpp" 34 35 #if INCLUDE_CDS_JAVA_HEAP 36 // A dump time sub-graph info for Klass _k. It includes the entry points 37 // (static fields in _k's mirror) of the archived sub-graphs reachable 38 // from _k's mirror. It also contains a list of Klasses of the objects 39 // within the sub-graphs. 40 class KlassSubGraphInfo: public CHeapObj<mtClass> { 41 private: 42 KlassSubGraphInfo* _next; 43 // The class that contains the static field(s) as the entry point(s) 44 // of archived object sub-graph(s). 45 Klass* _k; 46 // A list of classes need to be loaded and initialized before the archived 47 // object sub-graphs can be accessed at runtime. 48 GrowableArray<Klass*>* _subgraph_object_klasses; 49 // A list of _k's static fields as the entry points of archived sub-graphs. 50 // For each entry field, it is a pair of field_offset and field_value. 51 GrowableArray<juint>* _subgraph_entry_fields; 52 53 public: 54 KlassSubGraphInfo(Klass* k, KlassSubGraphInfo* next) : 55 _next(next), _k(k), _subgraph_object_klasses(NULL), 56 _subgraph_entry_fields(NULL) {} 57 ~KlassSubGraphInfo() { 58 if (_subgraph_object_klasses != NULL) { 59 delete _subgraph_object_klasses; 60 } 61 if (_subgraph_entry_fields != NULL) { 62 delete _subgraph_entry_fields; 63 } 64 }; 65 66 KlassSubGraphInfo* next() { return _next; } 67 Klass* klass() { return _k; } 68 GrowableArray<Klass*>* subgraph_object_klasses() { 69 return _subgraph_object_klasses; 70 } 71 GrowableArray<juint>* subgraph_entry_fields() { 72 return _subgraph_entry_fields; 73 } 74 void add_subgraph_entry_field(int static_field_offset, oop v); 75 void add_subgraph_object_klass(Klass *orig_k, Klass *relocated_k); 76 }; 77 78 // An archived record of object sub-graphs reachable from static 79 // fields within _k's mirror. The record is reloaded from the archive 80 // at runtime. 81 class ArchivedKlassSubGraphInfoRecord { 82 private: 83 ArchivedKlassSubGraphInfoRecord* _next; 84 Klass* _k; 85 86 // contains pairs of field offset and value for each subgraph entry field 87 Array<juint>* _entry_field_records; 88 89 // klasses of objects in archived sub-graphs referenced from the entry points 90 // (static fields) in the containing class 91 Array<Klass*>* _subgraph_klasses; 92 public: 93 ArchivedKlassSubGraphInfoRecord() : 94 _next(NULL), _k(NULL), _entry_field_records(NULL), _subgraph_klasses(NULL) {} 95 void init(KlassSubGraphInfo* info); 96 Klass* klass() { return _k; } 97 ArchivedKlassSubGraphInfoRecord* next() { return _next; } 98 void set_next(ArchivedKlassSubGraphInfoRecord* next) { _next = next; } 99 Array<juint>* entry_field_records() { return _entry_field_records; } 100 Array<Klass*>* subgraph_klasses() { return _subgraph_klasses; } 101 }; 102 #endif // INCLUDE_CDS_JAVA_HEAP 103 104 class HeapShared: AllStatic { 105 private: 106 #if INCLUDE_CDS_JAVA_HEAP 107 // This is a list of subgraph infos built at dump time while 108 // archiving object subgraphs. 109 static KlassSubGraphInfo* _subgraph_info_list; 110 111 // Contains a list of ArchivedKlassSubGraphInfoRecords that is stored 112 // in the archive file and reloaded at runtime. 113 static int _num_archived_subgraph_info_records; 114 static Array<ArchivedKlassSubGraphInfoRecord>* _archived_subgraph_info_records; 115 116 // Archive object sub-graph starting from the given static field 117 // in Klass k's mirror. 118 static void archive_reachable_objects_from_static_field( 119 Klass* k, int field_ofset, BasicType field_type, TRAPS); 120 121 static KlassSubGraphInfo* find_subgraph_info(Klass *k); 122 static KlassSubGraphInfo* get_subgraph_info(Klass *k); 123 static int num_of_subgraph_infos(); 124 125 static size_t build_archived_subgraph_info_records(int num_records); 126 127 // Used by decode_not_null 128 static address _narrow_oop_base; 129 static int _narrow_oop_shift; 130 131 #endif // INCLUDE_CDS_JAVA_HEAP 132 public: 133 static char* read_archived_subgraph_infos(char* buffer) NOT_CDS_JAVA_HEAP_RETURN_(buffer); 134 static void write_archived_subgraph_infos() NOT_CDS_JAVA_HEAP_RETURN; 135 static void initialize_from_archived_subgraph(Klass* k) NOT_CDS_JAVA_HEAP_RETURN; 136 137 // When reading an (unrelocated) narrowOop from the archive, use this function 138 // instead of CompressedOops::decode_not_null 139 inline static oop decode_not_null(narrowOop v) NOT_CDS_JAVA_HEAP_RETURN_(NULL); 140 static void init_narrow_oop_decoding(address base, int shift) NOT_CDS_JAVA_HEAP_RETURN; 141 142 static void archive_module_graph_objects(Thread* THREAD) NOT_CDS_JAVA_HEAP_RETURN; 143 }; 144 #endif // SHARE_VM_MEMORY_HEAPSHARED_HPP