ciObjectFactory.hpp revision 1472:c18cbe5936b8 
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.
31class ciObjectFactory : public ResourceObj {
32private:
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<ciReturnAddress*>* _return_addresses;
43  int                       _next_ident;
44
45public:
46  struct NonPermObject : public ResourceObj {
47    ciObject*      _object;
48    NonPermObject* _next;
49
50    inline NonPermObject(NonPermObject* &bucket, oop key, ciObject* object);
51    ciObject*     object()  { return _object; }
52    NonPermObject* &next()  { return _next; }
53  };
54private:
55  enum { NON_PERM_BUCKETS = 61 };
56  NonPermObject* _non_perm_bucket[NON_PERM_BUCKETS];
57  int _non_perm_count;
58
59  int find(oop key, GrowableArray<ciObject*>* objects);
60  bool is_found_at(int index, oop key, GrowableArray<ciObject*>* objects);
61  void insert(int index, ciObject* obj, GrowableArray<ciObject*>* objects);
62  ciObject* create_new_object(oop o);
63  static bool is_equal(NonPermObject* p, oop key) {
64    return p->object()->get_oop() == key;
65  }
66
67  NonPermObject* &find_non_perm(oop key);
68  void insert_non_perm(NonPermObject* &where, oop key, ciObject* obj);
69
70  void init_ident_of(ciObject* obj);
71
72  Arena* arena() { return _arena; }
73
74  void print_contents_impl();
75
76public:
77  static bool is_initialized() { return _initialized; }
78
79  static void initialize();
80  void init_shared_objects();
81
82  ciObjectFactory(Arena* arena, int expected_size);
83
84
85  // Get the ciObject corresponding to some oop.
86  ciObject* get(oop key);
87
88  // Get the ciSymbol corresponding to one of the vmSymbols.
89  static ciSymbol* vm_symbol_at(int index);
90
91  // Get the ciMethod representing an unloaded/unfound method.
92  ciMethod* get_unloaded_method(ciInstanceKlass* holder,
93                                ciSymbol*        name,
94                                ciSymbol*        signature);
95
96  // Get a ciKlass representing an unloaded klass.
97  ciKlass* get_unloaded_klass(ciKlass* accessing_klass,
98                              ciSymbol* name,
99                              bool create_if_not_found);
100
101
102  // Get the ciMethodData representing the methodData for a method
103  // with none.
104  ciMethodData* get_empty_methodData();
105
106  ciReturnAddress* get_return_address(int bci);
107
108  void print_contents();
109  void print();
110};
111