loaderConstraints.hpp revision 1472:c18cbe5936b8 
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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  // Note:  The main entry point for this module is via SystemDictionary.
64  // SystemDictionary::check_signature_loaders(symbolHandle signature,
65  //                                           Handle loader1, Handle loader2,
66  //                                           bool is_method, TRAPS)
67
68  klassOop find_constrained_klass(symbolHandle name, Handle loader);
69
70  // Class loader constraints
71
72  void ensure_loader_constraint_capacity(LoaderConstraintEntry *p, int nfree);
73  void extend_loader_constraint(LoaderConstraintEntry* p, Handle loader,
74                                klassOop klass);
75  void merge_loader_constraints(LoaderConstraintEntry** pp1,
76                                LoaderConstraintEntry** pp2, klassOop klass);
77
78  bool check_or_update(instanceKlassHandle k, Handle loader,
79                              symbolHandle name);
80
81
82  void purge_loader_constraints(BoolObjectClosure* is_alive);
83
84  void verify(Dictionary* dictionary, PlaceholderTable* placeholders);
85#ifndef PRODUCT
86  void print();
87#endif
88};
89
90class LoaderConstraintEntry : public HashtableEntry {
91  friend class VMStructs;
92private:
93  symbolOop              _name;                   // class name
94  int                    _num_loaders;
95  int                    _max_loaders;
96  oop*                   _loaders;                // initiating loaders
97
98public:
99
100  klassOop klass() { return (klassOop)literal(); }
101  klassOop* klass_addr() { return (klassOop*)literal_addr(); }
102  void set_klass(klassOop k) { set_literal(k); }
103
104  LoaderConstraintEntry* next() {
105    return (LoaderConstraintEntry*)HashtableEntry::next();
106  }
107
108  LoaderConstraintEntry** next_addr() {
109    return (LoaderConstraintEntry**)HashtableEntry::next_addr();
110  }
111  void set_next(LoaderConstraintEntry* next) {
112    HashtableEntry::set_next(next);
113  }
114
115  symbolOop name() { return _name; }
116  symbolOop* name_addr() { return &_name; }
117  void set_name(symbolOop name) { _name = name; }
118
119  int num_loaders() { return _num_loaders; }
120  void set_num_loaders(int i) { _num_loaders = i; }
121
122  int max_loaders() { return _max_loaders; }
123  void set_max_loaders(int i) { _max_loaders = i; }
124
125  oop* loaders() { return _loaders; }
126  void set_loaders(oop* loaders) { _loaders = loaders; }
127
128  oop loader(int i) { return _loaders[i]; }
129  oop* loader_addr(int i) { return &_loaders[i]; }
130  void set_loader(int i, oop p) { _loaders[i] = p; }
131
132};
133