jdk8-mips64-public/hotspot: src/share/vm/classfile/resolutionErrors.cpp@461159cd7a91

     1 /*

     2  * Copyright (c) 2005, 2012, 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  */

    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"

    33 // add new entry to the table

    34 void 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");

    40   ResolutionErrorEntry* entry = new_entry(hash, pool(), cp_index, error);

    41   add_entry(index, entry);

    42 }

    44 // find entry in the table

    45 ResolutionErrorEntry* ResolutionErrorTable::find_entry(int index, unsigned int hash,

    46                                                        constantPoolHandle pool, int cp_index)

    47 {

    48   assert_locked_or_safepoint(SystemDictionary_lock);

    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 }

    60 void 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 }

    66 // create new error entry

    67 ResolutionErrorEntry* ResolutionErrorTable::new_entry(int hash, ConstantPool* pool,

    68                                                       int cp_index, Symbol* error)

    69 {

    70   ResolutionErrorEntry* entry = (ResolutionErrorEntry*)Hashtable<ConstantPool*, mtClass>::new_entry(hash, pool);

    71   entry->set_cp_index(cp_index);

    72   NOT_PRODUCT(entry->set_error(NULL);)

    73   entry->set_error(error);

    75   return entry;

    76 }

    78 void 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<ConstantPool*, mtClass>::free_entry(entry);

    83 }

    86 // create resolution error table

    87 ResolutionErrorTable::ResolutionErrorTable(int table_size)

    88     : Hashtable<ConstantPool*, mtClass>(table_size, sizeof(ResolutionErrorEntry)) {

    89 }

    91 // RedefineClasses support - remove matching entry of a

    92 // constant pool that is going away

    93 void ResolutionErrorTable::delete_entry(ConstantPool* c) {

    94   assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");

    95   for (int i = 0; i < table_size(); i++) {

    96     for (ResolutionErrorEntry** p = bucket_addr(i); *p != NULL; ) {

    97       ResolutionErrorEntry* entry = *p;

    98       assert(entry->pool() != NULL, "resolution error table is corrupt");

    99       if (entry->pool() == c) {

   100         *p = entry->next();

   101         free_entry(entry);

   102       } else {

   103         p = entry->next_addr();

   104       }

   105     }

   106   }

   107 }

   110 // Remove unloaded entries from the table

   111 void ResolutionErrorTable::purge_resolution_errors() {

   112   assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");

   113   for (int i = 0; i < table_size(); i++) {

   114     for (ResolutionErrorEntry** p = bucket_addr(i); *p != NULL; ) {

   115       ResolutionErrorEntry* entry = *p;

   116       assert(entry->pool() != (ConstantPool*)NULL, "resolution error table is corrupt");

   117       ConstantPool* pool = entry->pool();

   118       assert(pool->pool_holder() != NULL, "Constant pool without a class?");

   119       ClassLoaderData* loader_data =

   120               pool->pool_holder()->class_loader_data();

   121       if (!loader_data->is_unloading()) {

   122         p = entry->next_addr();

   123       } else {

   124         *p = entry->next();

   125         free_entry(entry);

   126       }

   127     }

   128   }

   129 }

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