Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/concurrentMarkSweep/binaryTreeDictionary.hpp @ 408:52e32c8b317e
6761092: jvm crashes when CDS is enabled.
Summary: CDS hardcoded max c++ virtual method table increased
Reviewed-by: coleenp, xlu, jmasa
author | acorn |
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date | Wed, 22 Oct 2008 14:48:08 -0400 |
parents | d1605aabd0a1 |
children | e018e6884bd8 |
rev | line source |
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0 | 1 /* |
196 | 2 * Copyright 2001-2008 Sun Microsystems, Inc. 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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 /* | |
26 * A binary tree based search structure for free blocks. | |
27 * This is currently used in the Concurrent Mark&Sweep implementation. | |
28 */ | |
29 | |
30 // A TreeList is a FreeList which can be used to maintain a | |
31 // binary tree of free lists. | |
32 | |
33 class TreeChunk; | |
34 class BinaryTreeDictionary; | |
35 class AscendTreeCensusClosure; | |
36 class DescendTreeCensusClosure; | |
37 class DescendTreeSearchClosure; | |
38 | |
39 class TreeList: public FreeList { | |
40 friend class TreeChunk; | |
41 friend class BinaryTreeDictionary; | |
42 friend class AscendTreeCensusClosure; | |
43 friend class DescendTreeCensusClosure; | |
44 friend class DescendTreeSearchClosure; | |
45 TreeList* _parent; | |
46 TreeList* _left; | |
47 TreeList* _right; | |
48 | |
49 protected: | |
50 TreeList* parent() const { return _parent; } | |
51 TreeList* left() const { return _left; } | |
52 TreeList* right() const { return _right; } | |
53 | |
54 // Accessors for links in tree. | |
55 | |
56 void setLeft(TreeList* tl) { | |
57 _left = tl; | |
58 if (tl != NULL) | |
59 tl->setParent(this); | |
60 } | |
61 void setRight(TreeList* tl) { | |
62 _right = tl; | |
63 if (tl != NULL) | |
64 tl->setParent(this); | |
65 } | |
66 void setParent(TreeList* tl) { _parent = tl; } | |
67 | |
68 void clearLeft() { _left = NULL; } | |
69 void clearRight() { _right = NULL; } | |
70 void clearParent() { _parent = NULL; } | |
71 void initialize() { clearLeft(); clearRight(), clearParent(); } | |
72 | |
73 // For constructing a TreeList from a Tree chunk or | |
74 // address and size. | |
75 static TreeList* as_TreeList(TreeChunk* tc); | |
76 static TreeList* as_TreeList(HeapWord* addr, size_t size); | |
77 | |
78 // Returns the head of the free list as a pointer to a TreeChunk. | |
79 TreeChunk* head_as_TreeChunk(); | |
80 | |
81 // Returns the first available chunk in the free list as a pointer | |
82 // to a TreeChunk. | |
83 TreeChunk* first_available(); | |
84 | |
85 // removeChunkReplaceIfNeeded() removes the given "tc" from the TreeList. | |
86 // If "tc" is the first chunk in the list, it is also the | |
87 // TreeList that is the node in the tree. removeChunkReplaceIfNeeded() | |
88 // returns the possibly replaced TreeList* for the node in | |
89 // the tree. It also updates the parent of the original | |
90 // node to point to the new node. | |
91 TreeList* removeChunkReplaceIfNeeded(TreeChunk* tc); | |
92 // See FreeList. | |
93 void returnChunkAtHead(TreeChunk* tc); | |
94 void returnChunkAtTail(TreeChunk* tc); | |
95 }; | |
96 | |
97 // A TreeChunk is a subclass of a FreeChunk that additionally | |
98 // maintains a pointer to the free list on which it is currently | |
99 // linked. | |
100 // A TreeChunk is also used as a node in the binary tree. This | |
101 // allows the binary tree to be maintained without any additional | |
102 // storage (the free chunks are used). In a binary tree the first | |
103 // chunk in the free list is also the tree node. Note that the | |
104 // TreeChunk has an embedded TreeList for this purpose. Because | |
105 // the first chunk in the list is distinguished in this fashion | |
106 // (also is the node in the tree), it is the last chunk to be found | |
107 // on the free list for a node in the tree and is only removed if | |
108 // it is the last chunk on the free list. | |
109 | |
110 class TreeChunk : public FreeChunk { | |
111 friend class TreeList; | |
112 TreeList* _list; | |
113 TreeList _embedded_list; // if non-null, this chunk is on _list | |
114 protected: | |
115 TreeList* embedded_list() const { return (TreeList*) &_embedded_list; } | |
116 void set_embedded_list(TreeList* v) { _embedded_list = *v; } | |
117 public: | |
118 TreeList* list() { return _list; } | |
119 void set_list(TreeList* v) { _list = v; } | |
120 static TreeChunk* as_TreeChunk(FreeChunk* fc); | |
121 // Initialize fields in a TreeChunk that should be | |
122 // initialized when the TreeChunk is being added to | |
123 // a free list in the tree. | |
124 void initialize() { embedded_list()->initialize(); } | |
125 | |
126 // debugging | |
127 void verifyTreeChunkList() const; | |
128 }; | |
129 | |
130 const size_t MIN_TREE_CHUNK_SIZE = sizeof(TreeChunk)/HeapWordSize; | |
131 | |
132 class BinaryTreeDictionary: public FreeBlockDictionary { | |
152
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133 friend class VMStructs; |
0 | 134 bool _splay; |
135 size_t _totalSize; | |
136 size_t _totalFreeBlocks; | |
137 TreeList* _root; | |
138 | |
139 // private accessors | |
140 bool splay() const { return _splay; } | |
141 void set_splay(bool v) { _splay = v; } | |
142 size_t totalSize() const { return _totalSize; } | |
143 void set_totalSize(size_t v) { _totalSize = v; } | |
144 virtual void inc_totalSize(size_t v); | |
145 virtual void dec_totalSize(size_t v); | |
146 size_t totalFreeBlocks() const { return _totalFreeBlocks; } | |
147 void set_totalFreeBlocks(size_t v) { _totalFreeBlocks = v; } | |
148 TreeList* root() const { return _root; } | |
149 void set_root(TreeList* v) { _root = v; } | |
150 | |
151 // Remove a chunk of size "size" or larger from the tree and | |
152 // return it. If the chunk | |
153 // is the last chunk of that size, remove the node for that size | |
154 // from the tree. | |
155 TreeChunk* getChunkFromTree(size_t size, Dither dither, bool splay); | |
156 // Return a list of the specified size or NULL from the tree. | |
157 // The list is not removed from the tree. | |
158 TreeList* findList (size_t size) const; | |
159 // Remove this chunk from the tree. If the removal results | |
160 // in an empty list in the tree, remove the empty list. | |
161 TreeChunk* removeChunkFromTree(TreeChunk* tc); | |
162 // Remove the node in the trees starting at tl that has the | |
163 // minimum value and return it. Repair the tree as needed. | |
164 TreeList* removeTreeMinimum(TreeList* tl); | |
165 void semiSplayStep(TreeList* tl); | |
166 // Add this free chunk to the tree. | |
167 void insertChunkInTree(FreeChunk* freeChunk); | |
168 public: | |
169 void verifyTree() const; | |
170 // verify that the given chunk is in the tree. | |
171 bool verifyChunkInFreeLists(FreeChunk* tc) const; | |
172 private: | |
173 void verifyTreeHelper(TreeList* tl) const; | |
174 static size_t verifyPrevFreePtrs(TreeList* tl); | |
175 | |
176 // Returns the total number of chunks in the list. | |
177 size_t totalListLength(TreeList* tl) const; | |
178 // Returns the total number of words in the chunks in the tree | |
179 // starting at "tl". | |
180 size_t totalSizeInTree(TreeList* tl) const; | |
181 // Returns the sum of the square of the size of each block | |
182 // in the tree starting at "tl". | |
183 double sum_of_squared_block_sizes(TreeList* const tl) const; | |
184 // Returns the total number of free blocks in the tree starting | |
185 // at "tl". | |
186 size_t totalFreeBlocksInTree(TreeList* tl) const; | |
187 size_t numFreeBlocks() const; | |
188 size_t treeHeight() const; | |
189 size_t treeHeightHelper(TreeList* tl) const; | |
190 size_t totalNodesInTree(TreeList* tl) const; | |
191 size_t totalNodesHelper(TreeList* tl) const; | |
192 | |
193 public: | |
194 // Constructor | |
195 BinaryTreeDictionary(MemRegion mr, bool splay = false); | |
196 | |
197 // Reset the dictionary to the initial conditions with | |
198 // a single free chunk. | |
199 void reset(MemRegion mr); | |
200 void reset(HeapWord* addr, size_t size); | |
201 // Reset the dictionary to be empty. | |
202 void reset(); | |
203 | |
204 // Return a chunk of size "size" or greater from | |
205 // the tree. | |
206 // want a better dynamic splay strategy for the future. | |
207 FreeChunk* getChunk(size_t size, Dither dither) { | |
208 verify_par_locked(); | |
209 FreeChunk* res = getChunkFromTree(size, dither, splay()); | |
210 assert(res == NULL || res->isFree(), | |
211 "Should be returning a free chunk"); | |
212 return res; | |
213 } | |
214 | |
215 void returnChunk(FreeChunk* chunk) { | |
216 verify_par_locked(); | |
217 insertChunkInTree(chunk); | |
218 } | |
219 | |
220 void removeChunk(FreeChunk* chunk) { | |
221 verify_par_locked(); | |
222 removeChunkFromTree((TreeChunk*)chunk); | |
223 assert(chunk->isFree(), "Should still be a free chunk"); | |
224 } | |
225 | |
226 size_t maxChunkSize() const; | |
227 size_t totalChunkSize(debug_only(const Mutex* lock)) const { | |
228 debug_only( | |
229 if (lock != NULL && lock->owned_by_self()) { | |
230 assert(totalSizeInTree(root()) == totalSize(), | |
231 "_totalSize inconsistency"); | |
232 } | |
233 ) | |
234 return totalSize(); | |
235 } | |
236 | |
237 size_t minSize() const { | |
238 return MIN_TREE_CHUNK_SIZE; | |
239 } | |
240 | |
241 double sum_of_squared_block_sizes() const { | |
242 return sum_of_squared_block_sizes(root()); | |
243 } | |
244 | |
245 FreeChunk* find_chunk_ends_at(HeapWord* target) const; | |
246 | |
247 // Find the list with size "size" in the binary tree and update | |
248 // the statistics in the list according to "split" (chunk was | |
249 // split or coalesce) and "birth" (chunk was added or removed). | |
250 void dictCensusUpdate(size_t size, bool split, bool birth); | |
251 // Return true if the dictionary is overpopulated (more chunks of | |
252 // this size than desired) for size "size". | |
253 bool coalDictOverPopulated(size_t size); | |
254 // Methods called at the beginning of a sweep to prepare the | |
255 // statistics for the sweep. | |
256 void beginSweepDictCensus(double coalSurplusPercent, | |
257 float sweep_current, | |
258 float sweep_estimate); | |
259 // Methods called after the end of a sweep to modify the | |
260 // statistics for the sweep. | |
261 void endSweepDictCensus(double splitSurplusPercent); | |
262 // Return the largest free chunk in the tree. | |
263 FreeChunk* findLargestDict() const; | |
264 // Accessors for statistics | |
265 void setTreeSurplus(double splitSurplusPercent); | |
266 void setTreeHints(void); | |
267 // Reset statistics for all the lists in the tree. | |
268 void clearTreeCensus(void); | |
269 // Print the statistcis for all the lists in the tree. Also may | |
270 // print out summaries. | |
271 void printDictCensus(void) const; | |
272 | |
273 // For debugging. Returns the sum of the _returnedBytes for | |
274 // all lists in the tree. | |
275 size_t sumDictReturnedBytes() PRODUCT_RETURN0; | |
276 // Sets the _returnedBytes for all the lists in the tree to zero. | |
277 void initializeDictReturnedBytes() PRODUCT_RETURN; | |
278 // For debugging. Return the total number of chunks in the dictionary. | |
279 size_t totalCount() PRODUCT_RETURN0; | |
280 | |
281 void reportStatistics() const; | |
282 | |
283 void verify() const; | |
284 }; |