1 /* 2 * Copyright (c) 1999, 2013, 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 "gc/shared/barrierSet.hpp" 31 #include "utilities/growableArray.hpp" 32 33 // ciObjectFactory 34 // 35 // This class handles requests for the creation of new instances 36 // of ciObject and its subclasses. It contains a caching mechanism 37 // which ensures that for each oop, at most one ciObject is created. 38 // This invariant allows efficient implementation of ciObject. 39 class ciObjectFactory : public ResourceObj { 40 friend class VMStructs; 41 friend class ciEnv; 42 43 private: 44 static volatile bool _initialized; 45 static GrowableArray<ciMetadata*>* _shared_ci_metadata; 46 static ciSymbol* _shared_ci_symbols[]; 47 static int _shared_ident_limit; 48 49 Arena* _arena; 50 GrowableArray<ciMetadata*>* _ci_metadata; 51 GrowableArray<ciMethod*>* _unloaded_methods; 52 GrowableArray<ciKlass*>* _unloaded_klasses; 53 GrowableArray<ciInstance*>* _unloaded_instances; 54 GrowableArray<ciReturnAddress*>* _return_addresses; 55 GrowableArray<ciSymbol*>* _symbols; // keep list of symbols created 56 int _next_ident; 57 58 public: 59 struct NonPermObject : public ResourceObj { 60 ciObject* _object; 61 NonPermObject* _next; 62 63 inline NonPermObject(NonPermObject* &bucket, oop key, ciObject* object); 64 ciObject* object() { return _object; } 65 NonPermObject* &next() { return _next; } 66 }; 67 private: 68 enum { NON_PERM_BUCKETS = 61 }; 69 NonPermObject* _non_perm_bucket[NON_PERM_BUCKETS]; 70 int _non_perm_count; 71 72 int find(Metadata* key, GrowableArray<ciMetadata*>* objects); 73 bool is_found_at(int index, Metadata* key, GrowableArray<ciMetadata*>* objects); 74 void insert(int index, ciMetadata* obj, GrowableArray<ciMetadata*>* objects); 75 76 ciObject* create_new_object(oop o); 77 ciMetadata* create_new_metadata(Metadata* o); 78 79 void ensure_metadata_alive(ciMetadata* m); 80 81 static bool is_equal(NonPermObject* p, oop key) { 82 // Shenandoah: We already force-forwarded the key earlier. 83 // The oop in the object should always point to to-space. 84 assert(key == oopDesc::bs()->read_barrier(key), "should be forwarded"); 85 assert(p->object()->get_oop() == oopDesc::bs()->read_barrier(p->object()->get_oop()), 86 "should be forwarded"); 87 return p->object()->get_oop() == key; 88 } 89 90 NonPermObject* &find_non_perm(oop key); 91 void insert_non_perm(NonPermObject* &where, oop key, ciObject* obj); 92 93 void init_ident_of(ciBaseObject* obj); 94 95 Arena* arena() { return _arena; } 96 97 void print_contents_impl(); 98 99 ciInstance* get_unloaded_instance(ciInstanceKlass* klass); 100 101 public: 102 static bool is_initialized() { return _initialized; } 103 104 static void initialize(); 105 void init_shared_objects(); 106 void remove_symbols(); 107 108 ciObjectFactory(Arena* arena, int expected_size); 109 110 // Get the ciObject corresponding to some oop. 111 ciObject* get(oop key); 112 ciMetadata* get_metadata(Metadata* key); 113 ciSymbol* get_symbol(Symbol* key); 114 115 // Get the ciSymbol corresponding to one of the vmSymbols. 116 static ciSymbol* vm_symbol_at(int index); 117 118 // Get the ciMethod representing an unloaded/unfound method. 119 ciMethod* get_unloaded_method(ciInstanceKlass* holder, 120 ciSymbol* name, 121 ciSymbol* signature, 122 ciInstanceKlass* accessor); 123 124 // Get a ciKlass representing an unloaded klass. 125 ciKlass* get_unloaded_klass(ciKlass* accessing_klass, 126 ciSymbol* name, 127 bool create_if_not_found); 128 129 // Get a ciInstance representing an unresolved klass mirror. 130 ciInstance* get_unloaded_klass_mirror(ciKlass* type); 131 132 // Get a ciInstance representing an unresolved method handle constant. 133 ciInstance* get_unloaded_method_handle_constant(ciKlass* holder, 134 ciSymbol* name, 135 ciSymbol* signature, 136 int ref_kind); 137 138 // Get a ciInstance representing an unresolved method type constant. 139 ciInstance* get_unloaded_method_type_constant(ciSymbol* signature); 140 141 142 ciInstance* get_unloaded_object_constant(); 143 144 // Get the ciMethodData representing the methodData for a method 145 // with none. 146 ciMethodData* get_empty_methodData(); 147 148 ciReturnAddress* get_return_address(int bci); 149 150 GrowableArray<ciMetadata*>* get_ci_metadata() const { return _ci_metadata; } 151 // RedefineClasses support 152 void metadata_do(void f(Metadata*)); 153 154 void print_contents(); 155 void print(); 156 }; 157 158 #endif // SHARE_VM_CI_CIOBJECTFACTORY_HPP