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annotate src/share/vm/utilities/hashtable.cpp @ 20804:7848fc12602b

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Merge with jdk8u40-b25
author Gilles Duboscq <gilles.m.duboscq@oracle.com>
date Tue, 07 Apr 2015 14:58:49 +0200
parents 52b4284cb496 7baf47cb97cb
children
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1 /*
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2 * Copyright (c) 2003, 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #include "precompiled.hpp"
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26 #include "classfile/altHashing.hpp"
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27 #include "classfile/javaClasses.hpp"
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28 #include "memory/allocation.inline.hpp"
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29 #include "memory/filemap.hpp"
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30 #include "memory/resourceArea.hpp"
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31 #include "oops/oop.inline.hpp"
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32 #include "runtime/safepoint.hpp"
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33 #include "utilities/dtrace.hpp"
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34 #include "utilities/hashtable.hpp"
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35 #include "utilities/hashtable.inline.hpp"
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36 #include "utilities/numberSeq.hpp"
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37
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38
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39 // This hashtable is implemented as an open hash table with a fixed number of buckets.
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40
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41 template <MEMFLAGS F> BasicHashtableEntry<F>* BasicHashtable<F>::new_entry_free_list() {
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42 BasicHashtableEntry<F>* entry = NULL;
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43 if (_free_list != NULL) {
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44 entry = _free_list;
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45 _free_list = _free_list->next();
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46 }
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47 return entry;
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48 }
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49
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50 // HashtableEntrys are allocated in blocks to reduce the space overhead.
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51 template <MEMFLAGS F> BasicHashtableEntry<F>* BasicHashtable<F>::new_entry(unsigned int hashValue) {
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52 BasicHashtableEntry<F>* entry = new_entry_free_list();
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53
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54 if (entry == NULL) {
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55 if (_first_free_entry + _entry_size >= _end_block) {
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56 int block_size = MIN2(512, MAX2((int)_table_size / 2, (int)_number_of_entries));
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57 int len = _entry_size * block_size;
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58 len = 1 << log2_intptr(len); // round down to power of 2
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59 assert(len >= _entry_size, "");
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60 _first_free_entry = NEW_C_HEAP_ARRAY2(char, len, F, CURRENT_PC);
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61 _end_block = _first_free_entry + len;
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62 }
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63 entry = (BasicHashtableEntry<F>*)_first_free_entry;
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64 _first_free_entry += _entry_size;
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65 }
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66
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67 assert(_entry_size % HeapWordSize == 0, "");
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68 entry->set_hash(hashValue);
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69 return entry;
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70 }
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72
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73 template <class T, MEMFLAGS F> HashtableEntry<T, F>* Hashtable<T, F>::new_entry(unsigned int hashValue, T obj) {
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74 HashtableEntry<T, F>* entry;
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75
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76 entry = (HashtableEntry<T, F>*)BasicHashtable<F>::new_entry(hashValue);
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77 entry->set_literal(obj);
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78 return entry;
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79 }
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80
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81 // Check to see if the hashtable is unbalanced. The caller set a flag to
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82 // rehash at the next safepoint. If this bucket is 60 times greater than the
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83 // expected average bucket length, it's an unbalanced hashtable.
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84 // This is somewhat an arbitrary heuristic but if one bucket gets to
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85 // rehash_count which is currently 100, there's probably something wrong.
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86
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87 template <class T, MEMFLAGS F> bool RehashableHashtable<T, F>::check_rehash_table(int count) {
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88 assert(this->table_size() != 0, "underflow");
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89 if (count > (((double)this->number_of_entries()/(double)this->table_size())*rehash_multiple)) {
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90 // Set a flag for the next safepoint, which should be at some guaranteed
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91 // safepoint interval.
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92 return true;
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93 }
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94 return false;
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95 }
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96
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97 template <class T, MEMFLAGS F> juint RehashableHashtable<T, F>::_seed = 0;
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98
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99 // Create a new table and using alternate hash code, populate the new table
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100 // with the existing elements. This can be used to change the hash code
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101 // and could in the future change the size of the table.
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102
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103 template <class T, MEMFLAGS F> void RehashableHashtable<T, F>::move_to(RehashableHashtable<T, F>* new_table) {
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104
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105 // Initialize the global seed for hashing.
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106 _seed = AltHashing::compute_seed();
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107 assert(seed() != 0, "shouldn't be zero");
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108
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109 int saved_entry_count = this->number_of_entries();
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110
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111 // Iterate through the table and create a new entry for the new table
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112 for (int i = 0; i < new_table->table_size(); ++i) {
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113 for (HashtableEntry<T, F>* p = this->bucket(i); p != NULL; ) {
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114 HashtableEntry<T, F>* next = p->next();
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115 T string = p->literal();
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116 // Use alternate hashing algorithm on the symbol in the first table
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117 unsigned int hashValue = string->new_hash(seed());
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118 // Get a new index relative to the new table (can also change size)
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119 int index = new_table->hash_to_index(hashValue);
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120 p->set_hash(hashValue);
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121 // Keep the shared bit in the Hashtable entry to indicate that this entry
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122 // can't be deleted. The shared bit is the LSB in the _next field so
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123 // walking the hashtable past these entries requires
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124 // BasicHashtableEntry::make_ptr() call.
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125 bool keep_shared = p->is_shared();
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126 this->unlink_entry(p);
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127 new_table->add_entry(index, p);
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128 if (keep_shared) {
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129 p->set_shared();
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130 }
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131 p = next;
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132 }
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133 }
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134 // give the new table the free list as well
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135 new_table->copy_freelist(this);
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136 assert(new_table->number_of_entries() == saved_entry_count, "lost entry on dictionary copy?");
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137
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138 // Destroy memory used by the buckets in the hashtable. The memory
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139 // for the elements has been used in a new table and is not
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140 // destroyed. The memory reuse will benefit resizing the SystemDictionary
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141 // to avoid a memory allocation spike at safepoint.
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142 BasicHashtable<F>::free_buckets();
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143 }
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144
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145 template <MEMFLAGS F> void BasicHashtable<F>::free_buckets() {
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146 if (NULL != _buckets) {
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147 // Don't delete the buckets in the shared space. They aren't
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148 // allocated by os::malloc
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149 if (!UseSharedSpaces ||
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150 !FileMapInfo::current_info()->is_in_shared_space(_buckets)) {
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151 FREE_C_HEAP_ARRAY(HashtableBucket, _buckets, F);
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152 }
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153 _buckets = NULL;
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154 }
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155 }
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156
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157
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158 // Reverse the order of elements in the hash buckets.
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159
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160 template <MEMFLAGS F> void BasicHashtable<F>::reverse() {
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161
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162 for (int i = 0; i < _table_size; ++i) {
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163 BasicHashtableEntry<F>* new_list = NULL;
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164 BasicHashtableEntry<F>* p = bucket(i);
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165 while (p != NULL) {
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166 BasicHashtableEntry<F>* next = p->next();
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167 p->set_next(new_list);
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168 new_list = p;
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169 p = next;
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170 }
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171 *bucket_addr(i) = new_list;
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172 }
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173 }
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174
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175
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176 // Copy the table to the shared space.
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177
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178 template <MEMFLAGS F> void BasicHashtable<F>::copy_table(char** top, char* end) {
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179
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180 // Dump the hash table entries.
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181
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182 intptr_t *plen = (intptr_t*)(*top);
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183 *top += sizeof(*plen);
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184
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185 int i;
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186 for (i = 0; i < _table_size; ++i) {
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187 for (BasicHashtableEntry<F>** p = _buckets[i].entry_addr();
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188 *p != NULL;
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189 p = (*p)->next_addr()) {
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190 if (*top + entry_size() > end) {
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191 report_out_of_shared_space(SharedMiscData);
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192 }
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193 *p = (BasicHashtableEntry<F>*)memcpy(*top, *p, entry_size());
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194 *top += entry_size();
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195 }
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196 }
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197 *plen = (char*)(*top) - (char*)plen - sizeof(*plen);
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198
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199 // Set the shared bit.
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200
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201 for (i = 0; i < _table_size; ++i) {
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202 for (BasicHashtableEntry<F>* p = bucket(i); p != NULL; p = p->next()) {
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203 p->set_shared();
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204 }
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205 }
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206 }
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207
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208
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209
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210 // Reverse the order of elements in the hash buckets.
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211
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212 template <class T, MEMFLAGS F> void Hashtable<T, F>::reverse(void* boundary) {
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213
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214 for (int i = 0; i < this->table_size(); ++i) {
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215 HashtableEntry<T, F>* high_list = NULL;
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216 HashtableEntry<T, F>* low_list = NULL;
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217 HashtableEntry<T, F>* last_low_entry = NULL;
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218 HashtableEntry<T, F>* p = bucket(i);
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219 while (p != NULL) {
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220 HashtableEntry<T, F>* next = p->next();
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221 if ((void*)p->literal() >= boundary) {
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222 p->set_next(high_list);
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223 high_list = p;
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224 } else {
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225 p->set_next(low_list);
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226 low_list = p;
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227 if (last_low_entry == NULL) {
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228 last_low_entry = p;
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229 }
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230 }
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231 p = next;
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232 }
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233 if (low_list != NULL) {
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234 *bucket_addr(i) = low_list;
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235 last_low_entry->set_next(high_list);
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236 } else {
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237 *bucket_addr(i) = high_list;
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238 }
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239 }
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240 }
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241
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242 template <class T, MEMFLAGS F> int RehashableHashtable<T, F>::literal_size(Symbol *symbol) {
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243 return symbol->size() * HeapWordSize;
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244 }
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245
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246 template <class T, MEMFLAGS F> int RehashableHashtable<T, F>::literal_size(oop oop) {
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247 // NOTE: this would over-count if (pre-JDK8) java_lang_Class::has_offset_field() is true,
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248 // and the String.value array is shared by several Strings. However, starting from JDK8,
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249 // the String.value array is not shared anymore.
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250 assert(oop != NULL && oop->klass() == SystemDictionary::String_klass(), "only strings are supported");
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251 return (oop->size() + java_lang_String::value(oop)->size()) * HeapWordSize;
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252 }
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253
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254 // Dump footprint and bucket length statistics
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255 //
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256 // Note: if you create a new subclass of Hashtable<MyNewType, F>, you will need to
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257 // add a new function Hashtable<T, F>::literal_size(MyNewType lit)
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258
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259 template <class T, MEMFLAGS F> void RehashableHashtable<T, F>::dump_table(outputStream* st, const char *table_name) {
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260 NumberSeq summary;
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261 int literal_bytes = 0;
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262 for (int i = 0; i < this->table_size(); ++i) {
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263 int count = 0;
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264 for (HashtableEntry<T, F>* e = this->bucket(i);
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265 e != NULL; e = e->next()) {
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266 count++;
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267 literal_bytes += literal_size(e->literal());
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268 }
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269 summary.add((double)count);
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270 }
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271 double num_buckets = summary.num();
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272 double num_entries = summary.sum();
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273
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274 int bucket_bytes = (int)num_buckets * sizeof(HashtableBucket<F>);
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275 int entry_bytes = (int)num_entries * sizeof(HashtableEntry<T, F>);
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276 int total_bytes = literal_bytes + bucket_bytes + entry_bytes;
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277
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278 double bucket_avg = (num_buckets <= 0) ? 0 : (bucket_bytes / num_buckets);
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279 double entry_avg = (num_entries <= 0) ? 0 : (entry_bytes / num_entries);
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280 double literal_avg = (num_entries <= 0) ? 0 : (literal_bytes / num_entries);
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281
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282 st->print_cr("%s statistics:", table_name);
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283 st->print_cr("Number of buckets : %9d = %9d bytes, avg %7.3f", (int)num_buckets, bucket_bytes, bucket_avg);
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284 st->print_cr("Number of entries : %9d = %9d bytes, avg %7.3f", (int)num_entries, entry_bytes, entry_avg);
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285 st->print_cr("Number of literals : %9d = %9d bytes, avg %7.3f", (int)num_entries, literal_bytes, literal_avg);
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286 st->print_cr("Total footprint : %9s = %9d bytes", "", total_bytes);
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287 st->print_cr("Average bucket size : %9.3f", summary.avg());
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288 st->print_cr("Variance of bucket size : %9.3f", summary.variance());
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289 st->print_cr("Std. dev. of bucket size: %9.3f", summary.sd());
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290 st->print_cr("Maximum bucket size : %9d", (int)summary.maximum());
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291 }
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292
0
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293
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294 // Dump the hash table buckets.
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295
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296 template <MEMFLAGS F> void BasicHashtable<F>::copy_buckets(char** top, char* end) {
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297 intptr_t len = _table_size * sizeof(HashtableBucket<F>);
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298 *(intptr_t*)(*top) = len;
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299 *top += sizeof(intptr_t);
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300
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301 *(intptr_t*)(*top) = _number_of_entries;
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302 *top += sizeof(intptr_t);
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303
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304 if (*top + len > end) {
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305 report_out_of_shared_space(SharedMiscData);
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306 }
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307 _buckets = (HashtableBucket<F>*)memcpy(*top, _buckets, len);
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308 *top += len;
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309 }
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310
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311
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312 #ifndef PRODUCT
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313
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314 template <class T, MEMFLAGS F> void Hashtable<T, F>::print() {
0
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315 ResourceMark rm;
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316
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317 for (int i = 0; i < BasicHashtable<F>::table_size(); i++) {
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318 HashtableEntry<T, F>* entry = bucket(i);
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319 while(entry != NULL) {
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320 tty->print("%d : ", i);
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321 entry->literal()->print();
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322 tty->cr();
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323 entry = entry->next();
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324 }
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325 }
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326 }
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327
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328
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329 template <MEMFLAGS F> void BasicHashtable<F>::verify() {
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330 int count = 0;
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331 for (int i = 0; i < table_size(); i++) {
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332 for (BasicHashtableEntry<F>* p = bucket(i); p != NULL; p = p->next()) {
0
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333 ++count;
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334 }
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335 }
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336 assert(count == number_of_entries(), "number of hashtable entries incorrect");
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337 }
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338
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339
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340 #endif // PRODUCT
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341
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342
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343 #ifdef ASSERT
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344
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345 template <MEMFLAGS F> void BasicHashtable<F>::verify_lookup_length(double load) {
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346 if ((double)_lookup_length / (double)_lookup_count > load * 2.0) {
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347 warning("Performance bug: SystemDictionary lookup_count=%d "
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348 "lookup_length=%d average=%lf load=%f",
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349 _lookup_count, _lookup_length,
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350 (double) _lookup_length / _lookup_count, load);
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351 }
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352 }
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353
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354 #endif
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355 // Explicitly instantiate these types
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356 #if INCLUDE_ALL_GCS
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357 template class Hashtable<nmethod*, mtGC>;
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358 template class HashtableEntry<nmethod*, mtGC>;
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359 template class BasicHashtable<mtGC>;
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360 #endif
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361 template class Hashtable<ConstantPool*, mtClass>;
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362 template class RehashableHashtable<Symbol*, mtSymbol>;
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363 template class RehashableHashtable<oopDesc*, mtSymbol>;
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364 template class Hashtable<Symbol*, mtSymbol>;
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365 template class Hashtable<Klass*, mtClass>;
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366 template class Hashtable<oop, mtClass>;
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367 #if defined(SOLARIS) || defined(CHECK_UNHANDLED_OOPS)
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368 template class Hashtable<oop, mtSymbol>;
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369 template class RehashableHashtable<oop, mtSymbol>;
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370 #endif // SOLARIS || CHECK_UNHANDLED_OOPS
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371 template class Hashtable<oopDesc*, mtSymbol>;
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372 template class Hashtable<Symbol*, mtClass>;
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373 template class HashtableEntry<Symbol*, mtSymbol>;
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374 template class HashtableEntry<Symbol*, mtClass>;
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375 template class HashtableEntry<oop, mtSymbol>;
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376 template class BasicHashtableEntry<mtSymbol>;
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377 template class BasicHashtableEntry<mtCode>;
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378 template class BasicHashtable<mtClass>;
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379 template class BasicHashtable<mtSymbol>;
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380 template class BasicHashtable<mtCode>;
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381 template class BasicHashtable<mtInternal>;