loaderConstraints.hpp revision 0:a61af66fc99e 
1/*
2 * Copyright 2003-2006 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25class LoaderConstraintEntry;
26
27class LoaderConstraintTable : public Hashtable {
28  friend class VMStructs;
29private:
30
31  enum Constants {
32    _loader_constraint_size = 107,                     // number of entries in constraint table
33    _nof_buckets            = 1009                     // number of buckets in hash table
34  };
35
36  LoaderConstraintEntry** find_loader_constraint(symbolHandle name,
37                                                 Handle loader);
38
39public:
40
41  LoaderConstraintTable(int nof_buckets);
42
43  LoaderConstraintEntry* new_entry(unsigned int hash, symbolOop name,
44                                   klassOop klass, int num_loaders,
45                                   int max_loaders);
46
47  LoaderConstraintEntry* bucket(int i) {
48    return (LoaderConstraintEntry*)Hashtable::bucket(i);
49  }
50
51  LoaderConstraintEntry** bucket_addr(int i) {
52    return (LoaderConstraintEntry**)Hashtable::bucket_addr(i);
53  }
54
55  // GC support
56  void oops_do(OopClosure* f);
57  void always_strong_classes_do(OopClosure* blk);
58
59  // Check class loader constraints
60  bool add_entry(symbolHandle name, klassOop klass1, Handle loader1,
61                                    klassOop klass2, Handle loader2);
62
63  void check_signature_loaders(symbolHandle signature, Handle loader1,
64                               Handle loader2, bool is_method, TRAPS);
65
66  klassOop find_constrained_klass(symbolHandle name, Handle loader);
67  klassOop find_constrained_elem_klass(symbolHandle name, symbolHandle elem_name,
68                                       Handle loader, TRAPS);
69
70
71  // Class loader constraints
72
73  void ensure_loader_constraint_capacity(LoaderConstraintEntry *p, int nfree);
74  void extend_loader_constraint(LoaderConstraintEntry* p, Handle loader,
75                                klassOop klass);
76  void merge_loader_constraints(LoaderConstraintEntry** pp1,
77                                LoaderConstraintEntry** pp2, klassOop klass);
78
79  bool check_or_update(instanceKlassHandle k, Handle loader,
80                              symbolHandle name);
81
82
83  void purge_loader_constraints(BoolObjectClosure* is_alive);
84
85  void verify(Dictionary* dictionary);
86#ifndef PRODUCT
87  void print();
88#endif
89};
90
91class LoaderConstraintEntry : public HashtableEntry {
92  friend class VMStructs;
93private:
94  symbolOop              _name;                   // class name
95  int                    _num_loaders;
96  int                    _max_loaders;
97  oop*                   _loaders;                // initiating loaders
98
99public:
100
101  klassOop klass() { return (klassOop)literal(); }
102  klassOop* klass_addr() { return (klassOop*)literal_addr(); }
103  void set_klass(klassOop k) { set_literal(k); }
104
105  LoaderConstraintEntry* next() {
106    return (LoaderConstraintEntry*)HashtableEntry::next();
107  }
108
109  LoaderConstraintEntry** next_addr() {
110    return (LoaderConstraintEntry**)HashtableEntry::next_addr();
111  }
112  void set_next(LoaderConstraintEntry* next) {
113    HashtableEntry::set_next(next);
114  }
115
116  symbolOop name() { return _name; }
117  symbolOop* name_addr() { return &_name; }
118  void set_name(symbolOop name) { _name = name; }
119
120  int num_loaders() { return _num_loaders; }
121  void set_num_loaders(int i) { _num_loaders = i; }
122
123  int max_loaders() { return _max_loaders; }
124  void set_max_loaders(int i) { _max_loaders = i; }
125
126  oop* loaders() { return _loaders; }
127  void set_loaders(oop* loaders) { _loaders = loaders; }
128
129  oop loader(int i) { return _loaders[i]; }
130  oop* loader_addr(int i) { return &_loaders[i]; }
131  void set_loader(int i, oop p) { _loaders[i] = p; }
132
133};
134