resolutionErrors.cpp revision 2273:1d1603768966 
1/*
2 * Copyright (c) 2005, 2011, 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#include "precompiled.hpp"
26#include "classfile/resolutionErrors.hpp"
27#include "memory/resourceArea.hpp"
28#include "oops/oop.inline.hpp"
29#include "runtime/handles.inline.hpp"
30#include "runtime/safepoint.hpp"
31#include "utilities/hashtable.inline.hpp"
32
33// add new entry to the table
34void ResolutionErrorTable::add_entry(int index, unsigned int hash,
35                                     constantPoolHandle pool, int cp_index, Symbol* error)
36{
37  assert_locked_or_safepoint(SystemDictionary_lock);
38  assert(!pool.is_null() && error != NULL, "adding NULL obj");
39
40  ResolutionErrorEntry* entry = new_entry(hash, pool(), cp_index, error);
41  add_entry(index, entry);
42}
43
44// find entry in the table
45ResolutionErrorEntry* ResolutionErrorTable::find_entry(int index, unsigned int hash,
46                                                       constantPoolHandle pool, int cp_index)
47{
48  assert_locked_or_safepoint(SystemDictionary_lock);
49
50  for (ResolutionErrorEntry *error_probe = bucket(index);
51                         error_probe != NULL;
52                         error_probe = error_probe->next()) {
53  if (error_probe->hash() == hash && error_probe->pool() == pool()) {
54      return error_probe;;
55    }
56  }
57  return NULL;
58}
59
60void ResolutionErrorEntry::set_error(Symbol* e) {
61  assert(e == NULL || _error == NULL, "cannot reset error");
62  _error = e;
63  if (_error != NULL) _error->increment_refcount();
64}
65
66// create new error entry
67ResolutionErrorEntry* ResolutionErrorTable::new_entry(int hash, constantPoolOop pool,
68                                                      int cp_index, Symbol* error)
69{
70  ResolutionErrorEntry* entry = (ResolutionErrorEntry*)Hashtable<constantPoolOop>::new_entry(hash, pool);
71  entry->set_cp_index(cp_index);
72  NOT_PRODUCT(entry->set_error(NULL);)
73  entry->set_error(error);
74
75  return entry;
76}
77
78void ResolutionErrorTable::free_entry(ResolutionErrorEntry *entry) {
79  // decrement error refcount
80  assert(entry->error() != NULL, "error should be set");
81  entry->error()->decrement_refcount();
82  Hashtable<constantPoolOop>::free_entry(entry);
83}
84
85
86// create resolution error table
87ResolutionErrorTable::ResolutionErrorTable(int table_size)
88    : Hashtable<constantPoolOop>(table_size, sizeof(ResolutionErrorEntry)) {
89}
90
91// GC support
92void ResolutionErrorTable::oops_do(OopClosure* f) {
93  for (int i = 0; i < table_size(); i++) {
94    for (ResolutionErrorEntry* probe = bucket(i);
95                           probe != NULL;
96                           probe = probe->next()) {
97      assert(probe->pool() != (constantPoolOop)NULL, "resolution error table is corrupt");
98      assert(probe->error() != (Symbol*)NULL, "resolution error table is corrupt");
99      probe->oops_do(f);
100    }
101  }
102}
103
104// GC support
105void ResolutionErrorEntry::oops_do(OopClosure* blk) {
106  blk->do_oop((oop*)pool_addr());
107}
108
109// Remove unloaded entries from the table
110void ResolutionErrorTable::purge_resolution_errors(BoolObjectClosure* is_alive) {
111  assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
112  for (int i = 0; i < table_size(); i++) {
113    for (ResolutionErrorEntry** p = bucket_addr(i); *p != NULL; ) {
114      ResolutionErrorEntry* entry = *p;
115      assert(entry->pool() != (constantPoolOop)NULL, "resolution error table is corrupt");
116      constantPoolOop pool = entry->pool();
117      if (is_alive->do_object_b(pool)) {
118        p = entry->next_addr();
119      } else {
120        *p = entry->next();
121        free_entry(entry);
122      }
123    }
124  }
125}
126