1 /*
2 * Copyright (c) 2003, 2010, 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_CLASSFILE_LOADERCONSTRAINTS_HPP
26 #define SHARE_VM_CLASSFILE_LOADERCONSTRAINTS_HPP
27
28 #include "classfile/dictionary.hpp"
29 #include "classfile/placeholders.hpp"
30 #include "utilities/hashtable.hpp"
31
32 class LoaderConstraintEntry;
33
34 class LoaderConstraintTable : public Hashtable {
35 friend class VMStructs;
36 private:
37
38 enum Constants {
39 _loader_constraint_size = 107, // number of entries in constraint table
40 _nof_buckets = 1009 // number of buckets in hash table
41 };
42
43 LoaderConstraintEntry** find_loader_constraint(symbolHandle name,
44 Handle loader);
45
46 public:
47
48 LoaderConstraintTable(int nof_buckets);
49
50 LoaderConstraintEntry* new_entry(unsigned int hash, symbolOop name,
51 klassOop klass, int num_loaders,
52 int max_loaders);
53
54 LoaderConstraintEntry* bucket(int i) {
55 return (LoaderConstraintEntry*)Hashtable::bucket(i);
56 }
57
58 LoaderConstraintEntry** bucket_addr(int i) {
59 return (LoaderConstraintEntry**)Hashtable::bucket_addr(i);
60 }
61
62 // GC support
63 void oops_do(OopClosure* f);
64 void always_strong_classes_do(OopClosure* blk);
65
66 // Check class loader constraints
67 bool add_entry(symbolHandle name, klassOop klass1, Handle loader1,
68 klassOop klass2, Handle loader2);
69
70 // Note: The main entry point for this module is via SystemDictionary.
71 // SystemDictionary::check_signature_loaders(symbolHandle signature,
72 // Handle loader1, Handle loader2,
73 // bool is_method, TRAPS)
74
75 klassOop find_constrained_klass(symbolHandle name, Handle loader);
76
77 // Class loader constraints
78
79 void ensure_loader_constraint_capacity(LoaderConstraintEntry *p, int nfree);
80 void extend_loader_constraint(LoaderConstraintEntry* p, Handle loader,
81 klassOop klass);
82 void merge_loader_constraints(LoaderConstraintEntry** pp1,
83 LoaderConstraintEntry** pp2, klassOop klass);
84
85 bool check_or_update(instanceKlassHandle k, Handle loader,
86 symbolHandle name);
87
88
89 void purge_loader_constraints(BoolObjectClosure* is_alive);
90
91 void verify(Dictionary* dictionary, PlaceholderTable* placeholders);
92 #ifndef PRODUCT
93 void print();
94 #endif
95 };
96
97 class LoaderConstraintEntry : public HashtableEntry {
98 friend class VMStructs;
99 private:
100 symbolOop _name; // class name
101 int _num_loaders;
102 int _max_loaders;
103 oop* _loaders; // initiating loaders
104
105 public:
106
107 klassOop klass() { return (klassOop)literal(); }
108 klassOop* klass_addr() { return (klassOop*)literal_addr(); }
109 void set_klass(klassOop k) { set_literal(k); }
110
111 LoaderConstraintEntry* next() {
112 return (LoaderConstraintEntry*)HashtableEntry::next();
113 }
114
115 LoaderConstraintEntry** next_addr() {
116 return (LoaderConstraintEntry**)HashtableEntry::next_addr();
117 }
118 void set_next(LoaderConstraintEntry* next) {
119 HashtableEntry::set_next(next);
120 }
121
122 symbolOop name() { return _name; }
123 symbolOop* name_addr() { return &_name; }
124 void set_name(symbolOop name) { _name = name; }
125
126 int num_loaders() { return _num_loaders; }
127 void set_num_loaders(int i) { _num_loaders = i; }
128
129 int max_loaders() { return _max_loaders; }
130 void set_max_loaders(int i) { _max_loaders = i; }
131
132 oop* loaders() { return _loaders; }
133 void set_loaders(oop* loaders) { _loaders = loaders; }
134
135 oop loader(int i) { return _loaders[i]; }
136 oop* loader_addr(int i) { return &_loaders[i]; }
137 void set_loader(int i, oop p) { _loaders[i] = p; }
138
139 };
140
141 #endif // SHARE_VM_CLASSFILE_LOADERCONSTRAINTS_HPP