Tue, 20 Jul 2010 08:41:42 -0700
6964170: Verifier crashes
Summary: Check if klassOop != NULL rather than klass_part != NULL
Reviewed-by: kamg, never
1 /*
2 * Copyright (c) 2003, 2009, 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.
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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.
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23 */
25 class LoaderConstraintEntry;
27 class LoaderConstraintTable : public Hashtable {
28 friend class VMStructs;
29 private:
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 };
36 LoaderConstraintEntry** find_loader_constraint(symbolHandle name,
37 Handle loader);
39 public:
41 LoaderConstraintTable(int nof_buckets);
43 LoaderConstraintEntry* new_entry(unsigned int hash, symbolOop name,
44 klassOop klass, int num_loaders,
45 int max_loaders);
47 LoaderConstraintEntry* bucket(int i) {
48 return (LoaderConstraintEntry*)Hashtable::bucket(i);
49 }
51 LoaderConstraintEntry** bucket_addr(int i) {
52 return (LoaderConstraintEntry**)Hashtable::bucket_addr(i);
53 }
55 // GC support
56 void oops_do(OopClosure* f);
57 void always_strong_classes_do(OopClosure* blk);
59 // Check class loader constraints
60 bool add_entry(symbolHandle name, klassOop klass1, Handle loader1,
61 klassOop klass2, Handle loader2);
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)
68 klassOop find_constrained_klass(symbolHandle name, Handle loader);
70 // Class loader constraints
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);
78 bool check_or_update(instanceKlassHandle k, Handle loader,
79 symbolHandle name);
82 void purge_loader_constraints(BoolObjectClosure* is_alive);
84 void verify(Dictionary* dictionary, PlaceholderTable* placeholders);
85 #ifndef PRODUCT
86 void print();
87 #endif
88 };
90 class LoaderConstraintEntry : public HashtableEntry {
91 friend class VMStructs;
92 private:
93 symbolOop _name; // class name
94 int _num_loaders;
95 int _max_loaders;
96 oop* _loaders; // initiating loaders
98 public:
100 klassOop klass() { return (klassOop)literal(); }
101 klassOop* klass_addr() { return (klassOop*)literal_addr(); }
102 void set_klass(klassOop k) { set_literal(k); }
104 LoaderConstraintEntry* next() {
105 return (LoaderConstraintEntry*)HashtableEntry::next();
106 }
108 LoaderConstraintEntry** next_addr() {
109 return (LoaderConstraintEntry**)HashtableEntry::next_addr();
110 }
111 void set_next(LoaderConstraintEntry* next) {
112 HashtableEntry::set_next(next);
113 }
115 symbolOop name() { return _name; }
116 symbolOop* name_addr() { return &_name; }
117 void set_name(symbolOop name) { _name = name; }
119 int num_loaders() { return _num_loaders; }
120 void set_num_loaders(int i) { _num_loaders = i; }
122 int max_loaders() { return _max_loaders; }
123 void set_max_loaders(int i) { _max_loaders = i; }
125 oop* loaders() { return _loaders; }
126 void set_loaders(oop* loaders) { _loaders = loaders; }
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; }
132 };