1 /* 2 * Copyright (c) 1999, 2007, 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 // ciObjectFactory 26 // 27 // This class handles requests for the creation of new instances 28 // of ciObject and its subclasses. It contains a caching mechanism 29 // which ensures that for each oop, at most one ciObject is created. 30 // This invariant allows efficient implementation of ciObject. 31 class ciObjectFactory : public ResourceObj { 32 private: 33 static volatile bool _initialized; 34 static GrowableArray<ciObject*>* _shared_ci_objects; 35 static ciSymbol* _shared_ci_symbols[]; 36 static int _shared_ident_limit; 37 38 Arena* _arena; 39 GrowableArray<ciObject*>* _ci_objects; 40 GrowableArray<ciMethod*>* _unloaded_methods; 41 GrowableArray<ciKlass*>* _unloaded_klasses; 42 GrowableArray<ciInstance*>* _unloaded_instances; 43 GrowableArray<ciReturnAddress*>* _return_addresses; 44 int _next_ident; 45 46 public: 47 struct NonPermObject : public ResourceObj { 48 ciObject* _object; 49 NonPermObject* _next; 50 51 inline NonPermObject(NonPermObject* &bucket, oop key, ciObject* object); 52 ciObject* object() { return _object; } 53 NonPermObject* &next() { return _next; } 54 }; 55 private: 56 enum { NON_PERM_BUCKETS = 61 }; 57 NonPermObject* _non_perm_bucket[NON_PERM_BUCKETS]; 58 int _non_perm_count; 59 60 int find(oop key, GrowableArray<ciObject*>* objects); 61 bool is_found_at(int index, oop key, GrowableArray<ciObject*>* objects); 62 void insert(int index, ciObject* obj, GrowableArray<ciObject*>* objects); 63 ciObject* create_new_object(oop o); 64 static bool is_equal(NonPermObject* p, oop key) { 65 return p->object()->get_oop() == key; 66 } 67 68 NonPermObject* &find_non_perm(oop key); 69 void insert_non_perm(NonPermObject* &where, oop key, ciObject* obj); 70 71 void init_ident_of(ciObject* obj); 72 73 Arena* arena() { return _arena; } 74 75 void print_contents_impl(); 76 77 ciInstance* get_unloaded_instance(ciInstanceKlass* klass); 78 79 public: 80 static bool is_initialized() { return _initialized; } 81 82 static void initialize(); 83 void init_shared_objects(); 84 85 ciObjectFactory(Arena* arena, int expected_size); 86 87 88 // Get the ciObject corresponding to some oop. 89 ciObject* get(oop key); 90 91 // Get the ciSymbol corresponding to one of the vmSymbols. 92 static ciSymbol* vm_symbol_at(int index); 93 94 // Get the ciMethod representing an unloaded/unfound method. 95 ciMethod* get_unloaded_method(ciInstanceKlass* holder, 96 ciSymbol* name, 97 ciSymbol* signature); 98 99 // Get a ciKlass representing an unloaded klass. 100 ciKlass* get_unloaded_klass(ciKlass* accessing_klass, 101 ciSymbol* name, 102 bool create_if_not_found); 103 104 // Get a ciInstance representing an unresolved klass mirror. 105 ciInstance* get_unloaded_klass_mirror(ciKlass* type); 106 107 // Get a ciInstance representing an unresolved method handle constant. 108 ciInstance* get_unloaded_method_handle_constant(ciKlass* holder, 109 ciSymbol* name, 110 ciSymbol* signature, 111 int ref_kind); 112 113 // Get a ciInstance representing an unresolved method type constant. 114 ciInstance* get_unloaded_method_type_constant(ciSymbol* signature); 115 116 117 // Get the ciMethodData representing the methodData for a method 118 // with none. 119 ciMethodData* get_empty_methodData(); 120 121 ciReturnAddress* get_return_address(int bci); 122 123 void print_contents(); 124 void print(); 125 };