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annotate src/share/vm/utilities/hashtable.hpp @ 8071:bbc7936779f9
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date | Thu, 14 Feb 2013 09:11:43 +0100 |
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0 | 1 /* |
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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 #ifndef SHARE_VM_UTILITIES_HASHTABLE_HPP |
26 #define SHARE_VM_UTILITIES_HASHTABLE_HPP | |
27 | |
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28 #include "classfile/classLoaderData.hpp" |
1972 | 29 #include "memory/allocation.hpp" |
30 #include "oops/oop.hpp" | |
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31 #include "oops/symbol.hpp" |
1972 | 32 #include "runtime/handles.hpp" |
33 | |
0 | 34 // This is a generic hashtable, designed to be used for the symbol |
35 // and string tables. | |
36 // | |
37 // It is implemented as an open hash table with a fixed number of buckets. | |
38 // | |
39 // %note: | |
40 // - TableEntrys are allocated in blocks to reduce the space overhead. | |
41 | |
42 | |
43 | |
6197 | 44 template <MEMFLAGS F> class BasicHashtableEntry : public CHeapObj<F> { |
0 | 45 friend class VMStructs; |
46 private: | |
47 unsigned int _hash; // 32-bit hash for item | |
48 | |
49 // Link to next element in the linked list for this bucket. EXCEPT | |
50 // bit 0 set indicates that this entry is shared and must not be | |
51 // unlinked from the table. Bit 0 is set during the dumping of the | |
52 // archive. Since shared entries are immutable, _next fields in the | |
53 // shared entries will not change. New entries will always be | |
54 // unshared and since pointers are align, bit 0 will always remain 0 | |
55 // with no extra effort. | |
6197 | 56 BasicHashtableEntry<F>* _next; |
0 | 57 |
58 // Windows IA64 compiler requires subclasses to be able to access these | |
59 protected: | |
60 // Entry objects should not be created, they should be taken from the | |
61 // free list with BasicHashtable.new_entry(). | |
62 BasicHashtableEntry() { ShouldNotReachHere(); } | |
63 // Entry objects should not be destroyed. They should be placed on | |
64 // the free list instead with BasicHashtable.free_entry(). | |
65 ~BasicHashtableEntry() { ShouldNotReachHere(); } | |
66 | |
67 public: | |
68 | |
69 unsigned int hash() const { return _hash; } | |
70 void set_hash(unsigned int hash) { _hash = hash; } | |
71 unsigned int* hash_addr() { return &_hash; } | |
72 | |
6197 | 73 static BasicHashtableEntry<F>* make_ptr(BasicHashtableEntry<F>* p) { |
0 | 74 return (BasicHashtableEntry*)((intptr_t)p & -2); |
75 } | |
76 | |
6197 | 77 BasicHashtableEntry<F>* next() const { |
0 | 78 return make_ptr(_next); |
79 } | |
80 | |
6197 | 81 void set_next(BasicHashtableEntry<F>* next) { |
0 | 82 _next = next; |
83 } | |
84 | |
6197 | 85 BasicHashtableEntry<F>** next_addr() { |
0 | 86 return &_next; |
87 } | |
88 | |
89 bool is_shared() const { | |
90 return ((intptr_t)_next & 1) != 0; | |
91 } | |
92 | |
93 void set_shared() { | |
6197 | 94 _next = (BasicHashtableEntry<F>*)((intptr_t)_next | 1); |
0 | 95 } |
96 }; | |
97 | |
98 | |
99 | |
6197 | 100 template <class T, MEMFLAGS F> class HashtableEntry : public BasicHashtableEntry<F> { |
0 | 101 friend class VMStructs; |
102 private: | |
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103 T _literal; // ref to item in table. |
0 | 104 |
105 public: | |
106 // Literal | |
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107 T literal() const { return _literal; } |
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108 T* literal_addr() { return &_literal; } |
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109 void set_literal(T s) { _literal = s; } |
0 | 110 |
111 HashtableEntry* next() const { | |
6197 | 112 return (HashtableEntry*)BasicHashtableEntry<F>::next(); |
0 | 113 } |
114 HashtableEntry** next_addr() { | |
6197 | 115 return (HashtableEntry**)BasicHashtableEntry<F>::next_addr(); |
0 | 116 } |
117 }; | |
118 | |
119 | |
120 | |
6197 | 121 template <MEMFLAGS F> class HashtableBucket : public CHeapObj<F> { |
0 | 122 friend class VMStructs; |
123 private: | |
124 // Instance variable | |
6197 | 125 BasicHashtableEntry<F>* _entry; |
0 | 126 |
127 public: | |
128 // Accessing | |
129 void clear() { _entry = NULL; } | |
130 | |
131 // The following methods use order access methods to avoid race | |
132 // conditions in multiprocessor systems. | |
6197 | 133 BasicHashtableEntry<F>* get_entry() const; |
134 void set_entry(BasicHashtableEntry<F>* l); | |
0 | 135 |
136 // The following method is not MT-safe and must be done under lock. | |
6197 | 137 BasicHashtableEntry<F>** entry_addr() { return &_entry; } |
0 | 138 }; |
139 | |
140 | |
6197 | 141 template <MEMFLAGS F> class BasicHashtable : public CHeapObj<F> { |
0 | 142 friend class VMStructs; |
143 | |
144 public: | |
145 BasicHashtable(int table_size, int entry_size); | |
146 BasicHashtable(int table_size, int entry_size, | |
6197 | 147 HashtableBucket<F>* buckets, int number_of_entries); |
0 | 148 |
149 // Sharing support. | |
150 void copy_buckets(char** top, char* end); | |
151 void copy_table(char** top, char* end); | |
152 | |
153 // Bucket handling | |
154 int hash_to_index(unsigned int full_hash) { | |
155 int h = full_hash % _table_size; | |
156 assert(h >= 0 && h < _table_size, "Illegal hash value"); | |
157 return h; | |
158 } | |
159 | |
160 // Reverse the order of elements in each of the buckets. | |
161 void reverse(); | |
162 | |
163 private: | |
164 // Instance variables | |
165 int _table_size; | |
6197 | 166 HashtableBucket<F>* _buckets; |
167 BasicHashtableEntry<F>* _free_list; | |
0 | 168 char* _first_free_entry; |
169 char* _end_block; | |
170 int _entry_size; | |
171 int _number_of_entries; | |
172 | |
173 protected: | |
174 | |
175 #ifdef ASSERT | |
176 int _lookup_count; | |
177 int _lookup_length; | |
178 void verify_lookup_length(double load); | |
179 #endif | |
180 | |
6162 | 181 enum { |
182 rehash_count = 100, | |
183 rehash_multiple = 60 | |
184 }; | |
185 | |
0 | 186 void initialize(int table_size, int entry_size, int number_of_entries); |
187 | |
188 // Accessor | |
189 int entry_size() const { return _entry_size; } | |
190 | |
191 // The following method is MT-safe and may be used with caution. | |
6197 | 192 BasicHashtableEntry<F>* bucket(int i); |
0 | 193 |
194 // The following method is not MT-safe and must be done under lock. | |
6197 | 195 BasicHashtableEntry<F>** bucket_addr(int i) { return _buckets[i].entry_addr(); } |
0 | 196 |
197 // Table entry management | |
6197 | 198 BasicHashtableEntry<F>* new_entry(unsigned int hashValue); |
0 | 199 |
6162 | 200 // Check that the table is unbalanced |
201 bool check_rehash_table(int count); | |
202 | |
203 // Used when moving the entry to another table | |
204 // Clean up links, but do not add to free_list | |
6197 | 205 void unlink_entry(BasicHashtableEntry<F>* entry) { |
6162 | 206 entry->set_next(NULL); |
207 --_number_of_entries; | |
208 } | |
209 | |
210 // Move over freelist and free block for allocation | |
211 void copy_freelist(BasicHashtable* src) { | |
212 _free_list = src->_free_list; | |
213 src->_free_list = NULL; | |
214 _first_free_entry = src->_first_free_entry; | |
215 src->_first_free_entry = NULL; | |
216 _end_block = src->_end_block; | |
217 src->_end_block = NULL; | |
218 } | |
219 | |
220 // Free the buckets in this hashtable | |
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221 void free_buckets(); |
6162 | 222 |
0 | 223 public: |
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224 int table_size() { return _table_size; } |
6197 | 225 void set_entry(int index, BasicHashtableEntry<F>* entry); |
0 | 226 |
6197 | 227 void add_entry(int index, BasicHashtableEntry<F>* entry); |
0 | 228 |
6197 | 229 void free_entry(BasicHashtableEntry<F>* entry); |
0 | 230 |
231 int number_of_entries() { return _number_of_entries; } | |
232 | |
233 void verify() PRODUCT_RETURN; | |
234 }; | |
235 | |
236 | |
6197 | 237 template <class T, MEMFLAGS F> class Hashtable : public BasicHashtable<F> { |
0 | 238 friend class VMStructs; |
239 | |
240 public: | |
241 Hashtable(int table_size, int entry_size) | |
6197 | 242 : BasicHashtable<F>(table_size, entry_size) { } |
0 | 243 |
244 Hashtable(int table_size, int entry_size, | |
6197 | 245 HashtableBucket<F>* buckets, int number_of_entries) |
246 : BasicHashtable<F>(table_size, entry_size, buckets, number_of_entries) { } | |
0 | 247 |
248 // Debugging | |
249 void print() PRODUCT_RETURN; | |
250 | |
251 // Reverse the order of elements in each of the buckets. Hashtable | |
252 // entries which refer to objects at a lower address than 'boundary' | |
253 // are separated from those which refer to objects at higher | |
254 // addresses, and appear first in the list. | |
255 void reverse(void* boundary = NULL); | |
256 | |
257 protected: | |
258 | |
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259 unsigned int compute_hash(Symbol* name) { |
0 | 260 return (unsigned int) name->identity_hash(); |
261 } | |
262 | |
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263 int index_for(Symbol* name) { |
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264 return this->hash_to_index(compute_hash(name)); |
0 | 265 } |
266 | |
267 // Table entry management | |
6197 | 268 HashtableEntry<T, F>* new_entry(unsigned int hashValue, T obj); |
0 | 269 |
270 // The following method is MT-safe and may be used with caution. | |
6197 | 271 HashtableEntry<T, F>* bucket(int i) { |
272 return (HashtableEntry<T, F>*)BasicHashtable<F>::bucket(i); | |
0 | 273 } |
274 | |
275 // The following method is not MT-safe and must be done under lock. | |
6197 | 276 HashtableEntry<T, F>** bucket_addr(int i) { |
277 return (HashtableEntry<T, F>**)BasicHashtable<F>::bucket_addr(i); | |
0 | 278 } |
6162 | 279 |
280 // Function to move these elements into the new table. | |
6197 | 281 void move_to(Hashtable<T, F>* new_table); |
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282 static bool use_alternate_hashcode() { return _seed != 0; } |
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283 static jint seed() { return _seed; } |
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284 |
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285 private: |
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286 static jint _seed; |
0 | 287 }; |
288 | |
289 | |
290 // Verions of hashtable where two handles are used to compute the index. | |
291 | |
6197 | 292 template <class T, MEMFLAGS F> class TwoOopHashtable : public Hashtable<T, F> { |
0 | 293 friend class VMStructs; |
294 protected: | |
295 TwoOopHashtable(int table_size, int entry_size) | |
6197 | 296 : Hashtable<T, F>(table_size, entry_size) {} |
0 | 297 |
6197 | 298 TwoOopHashtable(int table_size, int entry_size, HashtableBucket<F>* t, |
0 | 299 int number_of_entries) |
6197 | 300 : Hashtable<T, F>(table_size, entry_size, t, number_of_entries) {} |
0 | 301 |
302 public: | |
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303 unsigned int compute_hash(Symbol* name, ClassLoaderData* loader_data) { |
0 | 304 unsigned int name_hash = name->identity_hash(); |
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305 // loader is null with CDS |
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306 assert(loader_data != NULL || UseSharedSpaces || DumpSharedSpaces, |
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307 "only allowed with shared spaces"); |
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308 unsigned int loader_hash = loader_data == NULL ? 0 : loader_data->identity_hash(); |
0 | 309 return name_hash ^ loader_hash; |
310 } | |
311 | |
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312 int index_for(Symbol* name, ClassLoaderData* loader_data) { |
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313 return this->hash_to_index(compute_hash(name, loader_data)); |
0 | 314 } |
315 }; | |
1972 | 316 |
317 #endif // SHARE_VM_UTILITIES_HASHTABLE_HPP |