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()->resolve_oop(key), "should be forwarded");
85 assert(p->object()->get_oop() == oopDesc::bs()->resolve_oop(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