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