Mercurial > hg > truffle
annotate src/share/vm/utilities/hashtable.cpp @ 7287:76c9023ed438
Remove now useless prefix arguments for jtt unittests
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Thu, 20 Dec 2012 17:06:59 +0100 |
parents | da91efe96a93 |
children | a5d6f0c3585f |
rev | line source |
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0 | 1 /* |
6162 | 2 * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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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. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
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26 #include "classfile/altHashing.hpp" |
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27 #include "classfile/javaClasses.hpp" |
1972 | 28 #include "memory/allocation.inline.hpp" |
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29 #include "memory/filemap.hpp" |
1972 | 30 #include "memory/resourceArea.hpp" |
31 #include "oops/oop.inline.hpp" | |
32 #include "runtime/safepoint.hpp" | |
33 #include "utilities/dtrace.hpp" | |
34 #include "utilities/hashtable.hpp" | |
35 #include "utilities/hashtable.inline.hpp" | |
0 | 36 |
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37 |
0 | 38 // This is a generic hashtable, designed to be used for the symbol |
39 // and string tables. | |
40 // | |
41 // It is implemented as an open hash table with a fixed number of buckets. | |
42 // | |
43 // %note: | |
44 // - HashtableEntrys are allocated in blocks to reduce the space overhead. | |
45 | |
6197 | 46 template <MEMFLAGS F> BasicHashtableEntry<F>* BasicHashtable<F>::new_entry(unsigned int hashValue) { |
47 BasicHashtableEntry<F>* entry; | |
0 | 48 |
49 if (_free_list) { | |
50 entry = _free_list; | |
51 _free_list = _free_list->next(); | |
52 } else { | |
432 | 53 if (_first_free_entry + _entry_size >= _end_block) { |
54 int block_size = MIN2(512, MAX2((int)_table_size / 2, (int)_number_of_entries)); | |
0 | 55 int len = _entry_size * block_size; |
432 | 56 len = 1 << log2_intptr(len); // round down to power of 2 |
57 assert(len >= _entry_size, ""); | |
6197 | 58 _first_free_entry = NEW_C_HEAP_ARRAY2(char, len, F, CURRENT_PC); |
0 | 59 _end_block = _first_free_entry + len; |
60 } | |
6197 | 61 entry = (BasicHashtableEntry<F>*)_first_free_entry; |
0 | 62 _first_free_entry += _entry_size; |
63 } | |
64 | |
432 | 65 assert(_entry_size % HeapWordSize == 0, ""); |
0 | 66 entry->set_hash(hashValue); |
67 return entry; | |
68 } | |
69 | |
70 | |
6197 | 71 template <class T, MEMFLAGS F> HashtableEntry<T, F>* Hashtable<T, F>::new_entry(unsigned int hashValue, T obj) { |
72 HashtableEntry<T, F>* entry; | |
0 | 73 |
6197 | 74 entry = (HashtableEntry<T, F>*)BasicHashtable<F>::new_entry(hashValue); |
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75 entry->set_literal(obj); |
0 | 76 return entry; |
77 } | |
78 | |
6162 | 79 // Check to see if the hashtable is unbalanced. The caller set a flag to |
80 // rehash at the next safepoint. If this bucket is 60 times greater than the | |
81 // expected average bucket length, it's an unbalanced hashtable. | |
82 // This is somewhat an arbitrary heuristic but if one bucket gets to | |
83 // rehash_count which is currently 100, there's probably something wrong. | |
84 | |
6197 | 85 template <MEMFLAGS F> bool BasicHashtable<F>::check_rehash_table(int count) { |
6162 | 86 assert(table_size() != 0, "underflow"); |
87 if (count > (((double)number_of_entries()/(double)table_size())*rehash_multiple)) { | |
88 // Set a flag for the next safepoint, which should be at some guaranteed | |
89 // safepoint interval. | |
90 return true; | |
91 } | |
92 return false; | |
93 } | |
94 | |
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95 template <class T, MEMFLAGS F> jint Hashtable<T, F>::_seed = 0; |
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96 |
6162 | 97 // Create a new table and using alternate hash code, populate the new table |
98 // with the existing elements. This can be used to change the hash code | |
99 // and could in the future change the size of the table. | |
100 | |
6197 | 101 template <class T, MEMFLAGS F> void Hashtable<T, F>::move_to(Hashtable<T, F>* new_table) { |
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102 |
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103 // Initialize the global seed for hashing. |
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104 _seed = AltHashing::compute_seed(); |
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105 assert(seed() != 0, "shouldn't be zero"); |
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106 |
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107 int saved_entry_count = this->number_of_entries(); |
6162 | 108 |
109 // Iterate through the table and create a new entry for the new table | |
110 for (int i = 0; i < new_table->table_size(); ++i) { | |
6197 | 111 for (HashtableEntry<T, F>* p = bucket(i); p != NULL; ) { |
112 HashtableEntry<T, F>* next = p->next(); | |
6162 | 113 T string = p->literal(); |
114 // Use alternate hashing algorithm on the symbol in the first table | |
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115 unsigned int hashValue = string->new_hash(seed()); |
6162 | 116 // Get a new index relative to the new table (can also change size) |
117 int index = new_table->hash_to_index(hashValue); | |
118 p->set_hash(hashValue); | |
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119 // Keep the shared bit in the Hashtable entry to indicate that this entry |
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120 // can't be deleted. The shared bit is the LSB in the _next field so |
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121 // walking the hashtable past these entries requires |
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122 // BasicHashtableEntry::make_ptr() call. |
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123 bool keep_shared = p->is_shared(); |
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124 this->unlink_entry(p); |
6162 | 125 new_table->add_entry(index, p); |
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126 if (keep_shared) { |
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127 p->set_shared(); |
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128 } |
6162 | 129 p = next; |
130 } | |
131 } | |
132 // give the new table the free list as well | |
133 new_table->copy_freelist(this); | |
134 assert(new_table->number_of_entries() == saved_entry_count, "lost entry on dictionary copy?"); | |
135 | |
136 // Destroy memory used by the buckets in the hashtable. The memory | |
137 // for the elements has been used in a new table and is not | |
138 // destroyed. The memory reuse will benefit resizing the SystemDictionary | |
139 // to avoid a memory allocation spike at safepoint. | |
6197 | 140 BasicHashtable<F>::free_buckets(); |
6162 | 141 } |
142 | |
6197 | 143 template <MEMFLAGS F> void BasicHashtable<F>::free_buckets() { |
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144 if (NULL != _buckets) { |
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145 // Don't delete the buckets in the shared space. They aren't |
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146 // allocated by os::malloc |
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147 if (!UseSharedSpaces || |
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148 !FileMapInfo::current_info()->is_in_shared_space(_buckets)) { |
6197 | 149 FREE_C_HEAP_ARRAY(HashtableBucket, _buckets, F); |
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150 } |
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151 _buckets = NULL; |
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152 } |
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153 } |
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154 |
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155 |
0 | 156 // Reverse the order of elements in the hash buckets. |
157 | |
6197 | 158 template <MEMFLAGS F> void BasicHashtable<F>::reverse() { |
0 | 159 |
160 for (int i = 0; i < _table_size; ++i) { | |
6197 | 161 BasicHashtableEntry<F>* new_list = NULL; |
162 BasicHashtableEntry<F>* p = bucket(i); | |
0 | 163 while (p != NULL) { |
6197 | 164 BasicHashtableEntry<F>* next = p->next(); |
0 | 165 p->set_next(new_list); |
166 new_list = p; | |
167 p = next; | |
168 } | |
169 *bucket_addr(i) = new_list; | |
170 } | |
171 } | |
172 | |
173 | |
174 // Copy the table to the shared space. | |
175 | |
6197 | 176 template <MEMFLAGS F> void BasicHashtable<F>::copy_table(char** top, char* end) { |
0 | 177 |
178 // Dump the hash table entries. | |
179 | |
180 intptr_t *plen = (intptr_t*)(*top); | |
181 *top += sizeof(*plen); | |
182 | |
183 int i; | |
184 for (i = 0; i < _table_size; ++i) { | |
6197 | 185 for (BasicHashtableEntry<F>** p = _buckets[i].entry_addr(); |
0 | 186 *p != NULL; |
187 p = (*p)->next_addr()) { | |
188 if (*top + entry_size() > end) { | |
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189 report_out_of_shared_space(SharedMiscData); |
0 | 190 } |
6197 | 191 *p = (BasicHashtableEntry<F>*)memcpy(*top, *p, entry_size()); |
0 | 192 *top += entry_size(); |
193 } | |
194 } | |
195 *plen = (char*)(*top) - (char*)plen - sizeof(*plen); | |
196 | |
197 // Set the shared bit. | |
198 | |
199 for (i = 0; i < _table_size; ++i) { | |
6197 | 200 for (BasicHashtableEntry<F>* p = bucket(i); p != NULL; p = p->next()) { |
0 | 201 p->set_shared(); |
202 } | |
203 } | |
204 } | |
205 | |
206 | |
207 | |
208 // Reverse the order of elements in the hash buckets. | |
209 | |
6197 | 210 template <class T, MEMFLAGS F> void Hashtable<T, F>::reverse(void* boundary) { |
0 | 211 |
6197 | 212 for (int i = 0; i < this->table_size(); ++i) { |
213 HashtableEntry<T, F>* high_list = NULL; | |
214 HashtableEntry<T, F>* low_list = NULL; | |
215 HashtableEntry<T, F>* last_low_entry = NULL; | |
216 HashtableEntry<T, F>* p = bucket(i); | |
0 | 217 while (p != NULL) { |
6197 | 218 HashtableEntry<T, F>* next = p->next(); |
0 | 219 if ((void*)p->literal() >= boundary) { |
220 p->set_next(high_list); | |
221 high_list = p; | |
222 } else { | |
223 p->set_next(low_list); | |
224 low_list = p; | |
225 if (last_low_entry == NULL) { | |
226 last_low_entry = p; | |
227 } | |
228 } | |
229 p = next; | |
230 } | |
231 if (low_list != NULL) { | |
232 *bucket_addr(i) = low_list; | |
233 last_low_entry->set_next(high_list); | |
234 } else { | |
235 *bucket_addr(i) = high_list; | |
236 } | |
237 } | |
238 } | |
239 | |
240 | |
241 // Dump the hash table buckets. | |
242 | |
6197 | 243 template <MEMFLAGS F> void BasicHashtable<F>::copy_buckets(char** top, char* end) { |
244 intptr_t len = _table_size * sizeof(HashtableBucket<F>); | |
0 | 245 *(intptr_t*)(*top) = len; |
246 *top += sizeof(intptr_t); | |
247 | |
248 *(intptr_t*)(*top) = _number_of_entries; | |
249 *top += sizeof(intptr_t); | |
250 | |
251 if (*top + len > end) { | |
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252 report_out_of_shared_space(SharedMiscData); |
0 | 253 } |
6197 | 254 _buckets = (HashtableBucket<F>*)memcpy(*top, _buckets, len); |
0 | 255 *top += len; |
256 } | |
257 | |
258 | |
259 #ifndef PRODUCT | |
260 | |
6197 | 261 template <class T, MEMFLAGS F> void Hashtable<T, F>::print() { |
0 | 262 ResourceMark rm; |
263 | |
6197 | 264 for (int i = 0; i < BasicHashtable<F>::table_size(); i++) { |
265 HashtableEntry<T, F>* entry = bucket(i); | |
0 | 266 while(entry != NULL) { |
267 tty->print("%d : ", i); | |
268 entry->literal()->print(); | |
269 tty->cr(); | |
270 entry = entry->next(); | |
271 } | |
272 } | |
273 } | |
274 | |
275 | |
6197 | 276 template <MEMFLAGS F> void BasicHashtable<F>::verify() { |
0 | 277 int count = 0; |
278 for (int i = 0; i < table_size(); i++) { | |
6197 | 279 for (BasicHashtableEntry<F>* p = bucket(i); p != NULL; p = p->next()) { |
0 | 280 ++count; |
281 } | |
282 } | |
283 assert(count == number_of_entries(), "number of hashtable entries incorrect"); | |
284 } | |
285 | |
286 | |
287 #endif // PRODUCT | |
288 | |
289 | |
290 #ifdef ASSERT | |
291 | |
6197 | 292 template <MEMFLAGS F> void BasicHashtable<F>::verify_lookup_length(double load) { |
0 | 293 if ((double)_lookup_length / (double)_lookup_count > load * 2.0) { |
294 warning("Performance bug: SystemDictionary lookup_count=%d " | |
295 "lookup_length=%d average=%lf load=%f", | |
296 _lookup_count, _lookup_length, | |
297 (double) _lookup_length / _lookup_count, load); | |
298 } | |
299 } | |
300 | |
301 #endif | |
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302 // Explicitly instantiate these types |
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303 template class Hashtable<ConstantPool*, mtClass>; |
6197 | 304 template class Hashtable<Symbol*, mtSymbol>; |
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305 template class Hashtable<Klass*, mtClass>; |
6197 | 306 template class Hashtable<oop, mtClass>; |
307 #ifdef SOLARIS | |
308 template class Hashtable<oop, mtSymbol>; | |
309 #endif | |
310 template class Hashtable<oopDesc*, mtSymbol>; | |
311 template class Hashtable<Symbol*, mtClass>; | |
312 template class HashtableEntry<Symbol*, mtSymbol>; | |
313 template class HashtableEntry<Symbol*, mtClass>; | |
314 template class HashtableEntry<oop, mtSymbol>; | |
315 template class BasicHashtableEntry<mtSymbol>; | |
316 template class BasicHashtableEntry<mtCode>; | |
317 template class BasicHashtable<mtClass>; | |
318 template class BasicHashtable<mtSymbol>; | |
319 template class BasicHashtable<mtCode>; | |
320 template class BasicHashtable<mtInternal>; |