1 /* 2 * Copyright (c) 1999, 2011, 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_CI_CIOBJECTFACTORY_HPP 26 #define SHARE_VM_CI_CIOBJECTFACTORY_HPP 27 28 #include "ci/ciClassList.hpp" 29 #include "ci/ciObject.hpp" 30 #include "utilities/growableArray.hpp" 31 32 // ciObjectFactory 33 // 34 // This class handles requests for the creation of new instances 35 // of ciObject and its subclasses. It contains a caching mechanism 36 // which ensures that for each oop, at most one ciObject is created. 37 // This invariant allows efficient implementation of ciObject. 38 class ciObjectFactory : public ResourceObj { 39 friend class VMStructs; 40 friend class ciEnv; 41 42 private: 43 static volatile bool _initialized; 44 static GrowableArray<ciObject*>* _shared_ci_objects; 45 static ciSymbol* _shared_ci_symbols[]; 46 static int _shared_ident_limit; 47 48 Arena* _arena; 49 GrowableArray<ciObject*>* _ci_objects; 50 GrowableArray<ciMethod*>* _unloaded_methods; 51 GrowableArray<ciKlass*>* _unloaded_klasses; 52 GrowableArray<ciInstance*>* _unloaded_instances; 53 GrowableArray<ciReturnAddress*>* _return_addresses; 54 GrowableArray<ciSymbol*>* _symbols; // keep list of symbols created 55 int _next_ident; 56 57 public: 58 struct NonPermObject : public ResourceObj { 59 ciObject* _object; 60 NonPermObject* _next; 61 62 inline NonPermObject(NonPermObject* &bucket, oop key, ciObject* object); 63 ciObject* object() { return _object; } 64 NonPermObject* &next() { return _next; } 65 }; 66 private: 67 enum { NON_PERM_BUCKETS = 61 }; 68 NonPermObject* _non_perm_bucket[NON_PERM_BUCKETS]; 69 int _non_perm_count; 70 71 int find(oop key, GrowableArray<ciObject*>* objects); 72 bool is_found_at(int index, oop key, GrowableArray<ciObject*>* objects); 73 void insert(int index, ciObject* obj, GrowableArray<ciObject*>* objects); 74 ciObject* create_new_object(oop o); 75 static bool is_equal(NonPermObject* p, oop key) { 76 return p->object()->get_oop() == key; 77 } 78 79 NonPermObject* &find_non_perm(oop key); 80 void insert_non_perm(NonPermObject* &where, oop key, ciObject* obj); 81 82 void init_ident_of(ciObject* obj); 83 void init_ident_of(ciSymbol* obj); 84 85 Arena* arena() { return _arena; } 86 87 void print_contents_impl(); 88 89 ciInstance* get_unloaded_instance(ciInstanceKlass* klass); 90 91 public: 92 static bool is_initialized() { return _initialized; } 93 94 static void initialize(); 95 void init_shared_objects(); 96 void remove_symbols(); 97 98 ciObjectFactory(Arena* arena, int expected_size); 99 100 // Get the ciObject corresponding to some oop. 101 ciObject* get(oop key); 102 103 ciSymbol* get_symbol(Symbol* key); 104 105 // Get the ciSymbol corresponding to one of the vmSymbols. 106 static ciSymbol* vm_symbol_at(int index); 107 108 // Get the ciMethod representing an unloaded/unfound method. 109 ciMethod* get_unloaded_method(ciInstanceKlass* holder, 110 ciSymbol* name, 111 ciSymbol* signature); 112 113 // Get a ciKlass representing an unloaded klass. 114 ciKlass* get_unloaded_klass(ciKlass* accessing_klass, 115 ciSymbol* name, 116 bool create_if_not_found); 117 118 // Get a ciInstance representing an unresolved klass mirror. 119 ciInstance* get_unloaded_klass_mirror(ciKlass* type); 120 121 // Get a ciInstance representing an unresolved method handle constant. 122 ciInstance* get_unloaded_method_handle_constant(ciKlass* holder, 123 ciSymbol* name, 124 ciSymbol* signature, 125 int ref_kind); 126 127 // Get a ciInstance representing an unresolved method type constant. 128 ciInstance* get_unloaded_method_type_constant(ciSymbol* signature); 129 130 131 // Get the ciMethodData representing the methodData for a method 132 // with none. 133 ciMethodData* get_empty_methodData(); 134 135 ciReturnAddress* get_return_address(int bci); 136 137 void print_contents(); 138 void print(); 139 }; 140 141 #endif // SHARE_VM_CI_CIOBJECTFACTORY_HPP