1 /*
2 * Copyright (c) 1999, 2020, 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_CI_CIOBJECTFACTORY_HPP
26 #define SHARE_CI_CIOBJECTFACTORY_HPP
27
28 #include "ci/ciClassList.hpp"
29 #include "ci/ciObject.hpp"
30 #include "utilities/growableArray.hpp"
31 #include "utilities/vmEnums.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 ArenaObj {
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 ArenaObj {
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 static int metadata_compare(Metadata* const& key, ciMetadata* const& elt);
73
74 ciObject* create_new_object(oop o);
75 ciMetadata* create_new_metadata(Metadata* o);
76
77 static bool is_equal(NonPermObject* p, oop key) {
78 return p->object()->get_oop() == key;
79 }
80
81 NonPermObject* &find_non_perm(oop key);
82 void insert_non_perm(NonPermObject* &where, oop key, ciObject* obj);
83
84 void init_ident_of(ciBaseObject* obj);
85
86 Arena* arena() { return _arena; }
87
88 void print_contents_impl();
89
90 ciInstance* get_unloaded_instance(ciInstanceKlass* klass);
91
92 public:
93 static bool is_initialized() { return _initialized; }
94
95 static void initialize();
96 void init_shared_objects();
97 void remove_symbols();
98
99 ciObjectFactory(Arena* arena, int expected_size);
100
101 // Get the ciObject corresponding to some oop.
102 ciObject* get(oop key);
103 ciMetadata* get_metadata(Metadata* key);
104 ciMetadata* cached_metadata(Metadata* key);
105 ciSymbol* get_symbol(Symbol* key);
106
107 // Get the ciSymbol corresponding to one of the vmSymbols.
108 static ciSymbol* vm_symbol_at(vmSymbolID index);
109
110 // Get the ciMethod representing an unloaded/unfound method.
111 ciMethod* get_unloaded_method(ciInstanceKlass* holder,
112 ciSymbol* name,
113 ciSymbol* signature,
114 ciInstanceKlass* accessor);
115
116 // Get a ciKlass representing an unloaded klass.
117 ciKlass* get_unloaded_klass(ciKlass* accessing_klass,
118 ciSymbol* name,
119 bool create_if_not_found);
120
121 // Get a ciInstance representing an unresolved klass mirror.
122 ciInstance* get_unloaded_klass_mirror(ciKlass* type);
123
124 // Get a ciInstance representing an unresolved method handle constant.
125 ciInstance* get_unloaded_method_handle_constant(ciKlass* holder,
126 ciSymbol* name,
127 ciSymbol* signature,
128 int ref_kind);
129
130 // Get a ciInstance representing an unresolved method type constant.
131 ciInstance* get_unloaded_method_type_constant(ciSymbol* signature);
132
133
134 ciInstance* get_unloaded_object_constant();
135
136 // Get the ciMethodData representing the methodData for a method
137 // with none.
138 ciMethodData* get_empty_methodData();
139
140 ciReturnAddress* get_return_address(int bci);
141
142 ciWrapper* make_null_free_wrapper(ciType* type);
143
144 GrowableArray<ciMetadata*>* get_ci_metadata() { return &_ci_metadata; }
145 // RedefineClasses support
146 void metadata_do(MetadataClosure* f);
147
148 void print_contents();
149 void print();
150 };
151
152 #endif // SHARE_CI_CIOBJECTFACTORY_HPP