Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/concurrentMarkSweep/binaryTreeDictionary.cpp @ 3672:5e331d5f760e
removed transition to vm in ci interface
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Fri, 18 Nov 2011 17:01:32 +0100 |
parents | f95d63e2154a |
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rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2001, 2010, 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" |
26 #include "gc_implementation/concurrentMarkSweep/binaryTreeDictionary.hpp" | |
27 #include "gc_implementation/shared/allocationStats.hpp" | |
28 #include "gc_implementation/shared/spaceDecorator.hpp" | |
29 #include "memory/space.inline.hpp" | |
30 #include "runtime/globals.hpp" | |
31 #include "utilities/ostream.hpp" | |
0 | 32 |
33 //////////////////////////////////////////////////////////////////////////////// | |
34 // A binary tree based search structure for free blocks. | |
35 // This is currently used in the Concurrent Mark&Sweep implementation. | |
36 //////////////////////////////////////////////////////////////////////////////// | |
37 | |
38 TreeChunk* TreeChunk::as_TreeChunk(FreeChunk* fc) { | |
39 // Do some assertion checking here. | |
40 return (TreeChunk*) fc; | |
41 } | |
42 | |
43 void TreeChunk::verifyTreeChunkList() const { | |
44 TreeChunk* nextTC = (TreeChunk*)next(); | |
45 if (prev() != NULL) { // interior list node shouldn'r have tree fields | |
46 guarantee(embedded_list()->parent() == NULL && embedded_list()->left() == NULL && | |
47 embedded_list()->right() == NULL, "should be clear"); | |
48 } | |
49 if (nextTC != NULL) { | |
50 guarantee(as_TreeChunk(nextTC->prev()) == this, "broken chain"); | |
51 guarantee(nextTC->size() == size(), "wrong size"); | |
52 nextTC->verifyTreeChunkList(); | |
53 } | |
54 } | |
55 | |
56 | |
57 TreeList* TreeList::as_TreeList(TreeChunk* tc) { | |
58 // This first free chunk in the list will be the tree list. | |
59 assert(tc->size() >= sizeof(TreeChunk), "Chunk is too small for a TreeChunk"); | |
60 TreeList* tl = tc->embedded_list(); | |
61 tc->set_list(tl); | |
62 #ifdef ASSERT | |
63 tl->set_protecting_lock(NULL); | |
64 #endif | |
65 tl->set_hint(0); | |
66 tl->set_size(tc->size()); | |
67 tl->link_head(tc); | |
68 tl->link_tail(tc); | |
69 tl->set_count(1); | |
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70 tl->init_statistics(true /* split_birth */); |
0 | 71 tl->setParent(NULL); |
72 tl->setLeft(NULL); | |
73 tl->setRight(NULL); | |
74 return tl; | |
75 } | |
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76 |
0 | 77 TreeList* TreeList::as_TreeList(HeapWord* addr, size_t size) { |
78 TreeChunk* tc = (TreeChunk*) addr; | |
79 assert(size >= sizeof(TreeChunk), "Chunk is too small for a TreeChunk"); | |
263
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80 // The space in the heap will have been mangled initially but |
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81 // is not remangled when a free chunk is returned to the free list |
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82 // (since it is used to maintain the chunk on the free list). |
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83 assert((ZapUnusedHeapArea && |
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84 SpaceMangler::is_mangled((HeapWord*) tc->size_addr()) && |
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85 SpaceMangler::is_mangled((HeapWord*) tc->prev_addr()) && |
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86 SpaceMangler::is_mangled((HeapWord*) tc->next_addr())) || |
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87 (tc->size() == 0 && tc->prev() == NULL && tc->next() == NULL), |
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88 "Space should be clear or mangled"); |
0 | 89 tc->setSize(size); |
90 tc->linkPrev(NULL); | |
91 tc->linkNext(NULL); | |
92 TreeList* tl = TreeList::as_TreeList(tc); | |
93 return tl; | |
94 } | |
95 | |
96 TreeList* TreeList::removeChunkReplaceIfNeeded(TreeChunk* tc) { | |
97 | |
98 TreeList* retTL = this; | |
99 FreeChunk* list = head(); | |
100 assert(!list || list != list->next(), "Chunk on list twice"); | |
101 assert(tc != NULL, "Chunk being removed is NULL"); | |
102 assert(parent() == NULL || this == parent()->left() || | |
103 this == parent()->right(), "list is inconsistent"); | |
104 assert(tc->isFree(), "Header is not marked correctly"); | |
105 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
106 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
107 | |
108 FreeChunk* prevFC = tc->prev(); | |
109 TreeChunk* nextTC = TreeChunk::as_TreeChunk(tc->next()); | |
110 assert(list != NULL, "should have at least the target chunk"); | |
111 | |
112 // Is this the first item on the list? | |
113 if (tc == list) { | |
114 // The "getChunk..." functions for a TreeList will not return the | |
115 // first chunk in the list unless it is the last chunk in the list | |
116 // because the first chunk is also acting as the tree node. | |
117 // When coalescing happens, however, the first chunk in the a tree | |
118 // list can be the start of a free range. Free ranges are removed | |
119 // from the free lists so that they are not available to be | |
120 // allocated when the sweeper yields (giving up the free list lock) | |
121 // to allow mutator activity. If this chunk is the first in the | |
122 // list and is not the last in the list, do the work to copy the | |
123 // TreeList from the first chunk to the next chunk and update all | |
124 // the TreeList pointers in the chunks in the list. | |
125 if (nextTC == NULL) { | |
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126 assert(prevFC == NULL, "Not last chunk in the list"); |
0 | 127 set_tail(NULL); |
128 set_head(NULL); | |
129 } else { | |
130 // copy embedded list. | |
131 nextTC->set_embedded_list(tc->embedded_list()); | |
132 retTL = nextTC->embedded_list(); | |
133 // Fix the pointer to the list in each chunk in the list. | |
134 // This can be slow for a long list. Consider having | |
135 // an option that does not allow the first chunk on the | |
136 // list to be coalesced. | |
137 for (TreeChunk* curTC = nextTC; curTC != NULL; | |
138 curTC = TreeChunk::as_TreeChunk(curTC->next())) { | |
139 curTC->set_list(retTL); | |
140 } | |
141 // Fix the parent to point to the new TreeList. | |
142 if (retTL->parent() != NULL) { | |
143 if (this == retTL->parent()->left()) { | |
144 retTL->parent()->setLeft(retTL); | |
145 } else { | |
146 assert(this == retTL->parent()->right(), "Parent is incorrect"); | |
147 retTL->parent()->setRight(retTL); | |
148 } | |
149 } | |
150 // Fix the children's parent pointers to point to the | |
151 // new list. | |
152 assert(right() == retTL->right(), "Should have been copied"); | |
153 if (retTL->right() != NULL) { | |
154 retTL->right()->setParent(retTL); | |
155 } | |
156 assert(left() == retTL->left(), "Should have been copied"); | |
157 if (retTL->left() != NULL) { | |
158 retTL->left()->setParent(retTL); | |
159 } | |
160 retTL->link_head(nextTC); | |
161 assert(nextTC->isFree(), "Should be a free chunk"); | |
162 } | |
163 } else { | |
164 if (nextTC == NULL) { | |
165 // Removing chunk at tail of list | |
166 link_tail(prevFC); | |
167 } | |
168 // Chunk is interior to the list | |
169 prevFC->linkAfter(nextTC); | |
170 } | |
171 | |
172 // Below this point the embeded TreeList being used for the | |
173 // tree node may have changed. Don't use "this" | |
174 // TreeList*. | |
175 // chunk should still be a free chunk (bit set in _prev) | |
176 assert(!retTL->head() || retTL->size() == retTL->head()->size(), | |
177 "Wrong sized chunk in list"); | |
178 debug_only( | |
179 tc->linkPrev(NULL); | |
180 tc->linkNext(NULL); | |
181 tc->set_list(NULL); | |
182 bool prev_found = false; | |
183 bool next_found = false; | |
184 for (FreeChunk* curFC = retTL->head(); | |
185 curFC != NULL; curFC = curFC->next()) { | |
186 assert(curFC != tc, "Chunk is still in list"); | |
187 if (curFC == prevFC) { | |
188 prev_found = true; | |
189 } | |
190 if (curFC == nextTC) { | |
191 next_found = true; | |
192 } | |
193 } | |
194 assert(prevFC == NULL || prev_found, "Chunk was lost from list"); | |
195 assert(nextTC == NULL || next_found, "Chunk was lost from list"); | |
196 assert(retTL->parent() == NULL || | |
197 retTL == retTL->parent()->left() || | |
198 retTL == retTL->parent()->right(), | |
199 "list is inconsistent"); | |
200 ) | |
201 retTL->decrement_count(); | |
202 | |
203 assert(tc->isFree(), "Should still be a free chunk"); | |
204 assert(retTL->head() == NULL || retTL->head()->prev() == NULL, | |
205 "list invariant"); | |
206 assert(retTL->tail() == NULL || retTL->tail()->next() == NULL, | |
207 "list invariant"); | |
208 return retTL; | |
209 } | |
210 void TreeList::returnChunkAtTail(TreeChunk* chunk) { | |
211 assert(chunk != NULL, "returning NULL chunk"); | |
212 assert(chunk->list() == this, "list should be set for chunk"); | |
213 assert(tail() != NULL, "The tree list is embedded in the first chunk"); | |
214 // which means that the list can never be empty. | |
215 assert(!verifyChunkInFreeLists(chunk), "Double entry"); | |
216 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
217 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
218 | |
219 FreeChunk* fc = tail(); | |
220 fc->linkAfter(chunk); | |
221 link_tail(chunk); | |
222 | |
223 assert(!tail() || size() == tail()->size(), "Wrong sized chunk in list"); | |
224 increment_count(); | |
225 debug_only(increment_returnedBytes_by(chunk->size()*sizeof(HeapWord));) | |
226 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
227 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
228 } | |
229 | |
230 // Add this chunk at the head of the list. "At the head of the list" | |
231 // is defined to be after the chunk pointer to by head(). This is | |
232 // because the TreeList is embedded in the first TreeChunk in the | |
233 // list. See the definition of TreeChunk. | |
234 void TreeList::returnChunkAtHead(TreeChunk* chunk) { | |
235 assert(chunk->list() == this, "list should be set for chunk"); | |
236 assert(head() != NULL, "The tree list is embedded in the first chunk"); | |
237 assert(chunk != NULL, "returning NULL chunk"); | |
238 assert(!verifyChunkInFreeLists(chunk), "Double entry"); | |
239 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
240 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
241 | |
242 FreeChunk* fc = head()->next(); | |
243 if (fc != NULL) { | |
244 chunk->linkAfter(fc); | |
245 } else { | |
246 assert(tail() == NULL, "List is inconsistent"); | |
247 link_tail(chunk); | |
248 } | |
249 head()->linkAfter(chunk); | |
250 assert(!head() || size() == head()->size(), "Wrong sized chunk in list"); | |
251 increment_count(); | |
252 debug_only(increment_returnedBytes_by(chunk->size()*sizeof(HeapWord));) | |
253 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
254 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
255 } | |
256 | |
257 TreeChunk* TreeList::head_as_TreeChunk() { | |
258 assert(head() == NULL || TreeChunk::as_TreeChunk(head())->list() == this, | |
259 "Wrong type of chunk?"); | |
260 return TreeChunk::as_TreeChunk(head()); | |
261 } | |
262 | |
263 TreeChunk* TreeList::first_available() { | |
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264 assert(head() != NULL, "The head of the list cannot be NULL"); |
0 | 265 FreeChunk* fc = head()->next(); |
266 TreeChunk* retTC; | |
267 if (fc == NULL) { | |
268 retTC = head_as_TreeChunk(); | |
269 } else { | |
270 retTC = TreeChunk::as_TreeChunk(fc); | |
271 } | |
272 assert(retTC->list() == this, "Wrong type of chunk."); | |
273 return retTC; | |
274 } | |
275 | |
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276 // Returns the block with the largest heap address amongst |
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277 // those in the list for this size; potentially slow and expensive, |
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278 // use with caution! |
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279 TreeChunk* TreeList::largest_address() { |
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280 assert(head() != NULL, "The head of the list cannot be NULL"); |
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281 FreeChunk* fc = head()->next(); |
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282 TreeChunk* retTC; |
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283 if (fc == NULL) { |
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284 retTC = head_as_TreeChunk(); |
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285 } else { |
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286 // walk down the list and return the one with the highest |
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287 // heap address among chunks of this size. |
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288 FreeChunk* last = fc; |
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289 while (fc->next() != NULL) { |
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290 if ((HeapWord*)last < (HeapWord*)fc) { |
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291 last = fc; |
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292 } |
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293 fc = fc->next(); |
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294 } |
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295 retTC = TreeChunk::as_TreeChunk(last); |
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296 } |
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297 assert(retTC->list() == this, "Wrong type of chunk."); |
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298 return retTC; |
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299 } |
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300 |
0 | 301 BinaryTreeDictionary::BinaryTreeDictionary(MemRegion mr, bool splay): |
302 _splay(splay) | |
303 { | |
304 assert(mr.byte_size() > MIN_TREE_CHUNK_SIZE, "minimum chunk size"); | |
305 | |
306 reset(mr); | |
307 assert(root()->left() == NULL, "reset check failed"); | |
308 assert(root()->right() == NULL, "reset check failed"); | |
309 assert(root()->head()->next() == NULL, "reset check failed"); | |
310 assert(root()->head()->prev() == NULL, "reset check failed"); | |
311 assert(totalSize() == root()->size(), "reset check failed"); | |
312 assert(totalFreeBlocks() == 1, "reset check failed"); | |
313 } | |
314 | |
315 void BinaryTreeDictionary::inc_totalSize(size_t inc) { | |
316 _totalSize = _totalSize + inc; | |
317 } | |
318 | |
319 void BinaryTreeDictionary::dec_totalSize(size_t dec) { | |
320 _totalSize = _totalSize - dec; | |
321 } | |
322 | |
323 void BinaryTreeDictionary::reset(MemRegion mr) { | |
324 assert(mr.byte_size() > MIN_TREE_CHUNK_SIZE, "minimum chunk size"); | |
325 set_root(TreeList::as_TreeList(mr.start(), mr.word_size())); | |
326 set_totalSize(mr.word_size()); | |
327 set_totalFreeBlocks(1); | |
328 } | |
329 | |
330 void BinaryTreeDictionary::reset(HeapWord* addr, size_t byte_size) { | |
331 MemRegion mr(addr, heap_word_size(byte_size)); | |
332 reset(mr); | |
333 } | |
334 | |
335 void BinaryTreeDictionary::reset() { | |
336 set_root(NULL); | |
337 set_totalSize(0); | |
338 set_totalFreeBlocks(0); | |
339 } | |
340 | |
341 // Get a free block of size at least size from tree, or NULL. | |
342 // If a splay step is requested, the removal algorithm (only) incorporates | |
343 // a splay step as follows: | |
344 // . the search proceeds down the tree looking for a possible | |
345 // match. At the (closest) matching location, an appropriate splay step is applied | |
346 // (zig, zig-zig or zig-zag). A chunk of the appropriate size is then returned | |
347 // if available, and if it's the last chunk, the node is deleted. A deteleted | |
348 // node is replaced in place by its tree successor. | |
349 TreeChunk* | |
350 BinaryTreeDictionary::getChunkFromTree(size_t size, Dither dither, bool splay) | |
351 { | |
352 TreeList *curTL, *prevTL; | |
353 TreeChunk* retTC = NULL; | |
354 assert(size >= MIN_TREE_CHUNK_SIZE, "minimum chunk size"); | |
355 if (FLSVerifyDictionary) { | |
356 verifyTree(); | |
357 } | |
358 // starting at the root, work downwards trying to find match. | |
359 // Remember the last node of size too great or too small. | |
360 for (prevTL = curTL = root(); curTL != NULL;) { | |
361 if (curTL->size() == size) { // exact match | |
362 break; | |
363 } | |
364 prevTL = curTL; | |
365 if (curTL->size() < size) { // proceed to right sub-tree | |
366 curTL = curTL->right(); | |
367 } else { // proceed to left sub-tree | |
368 assert(curTL->size() > size, "size inconsistency"); | |
369 curTL = curTL->left(); | |
370 } | |
371 } | |
372 if (curTL == NULL) { // couldn't find exact match | |
373 // try and find the next larger size by walking back up the search path | |
374 for (curTL = prevTL; curTL != NULL;) { | |
375 if (curTL->size() >= size) break; | |
376 else curTL = curTL->parent(); | |
377 } | |
378 assert(curTL == NULL || curTL->count() > 0, | |
379 "An empty list should not be in the tree"); | |
380 } | |
381 if (curTL != NULL) { | |
382 assert(curTL->size() >= size, "size inconsistency"); | |
383 if (UseCMSAdaptiveFreeLists) { | |
384 | |
385 // A candidate chunk has been found. If it is already under | |
386 // populated, get a chunk associated with the hint for this | |
387 // chunk. | |
388 if (curTL->surplus() <= 0) { | |
389 /* Use the hint to find a size with a surplus, and reset the hint. */ | |
390 TreeList* hintTL = curTL; | |
391 while (hintTL->hint() != 0) { | |
392 assert(hintTL->hint() == 0 || hintTL->hint() > hintTL->size(), | |
393 "hint points in the wrong direction"); | |
394 hintTL = findList(hintTL->hint()); | |
395 assert(curTL != hintTL, "Infinite loop"); | |
396 if (hintTL == NULL || | |
397 hintTL == curTL /* Should not happen but protect against it */ ) { | |
398 // No useful hint. Set the hint to NULL and go on. | |
399 curTL->set_hint(0); | |
400 break; | |
401 } | |
402 assert(hintTL->size() > size, "hint is inconsistent"); | |
403 if (hintTL->surplus() > 0) { | |
404 // The hint led to a list that has a surplus. Use it. | |
405 // Set the hint for the candidate to an overpopulated | |
406 // size. | |
407 curTL->set_hint(hintTL->size()); | |
408 // Change the candidate. | |
409 curTL = hintTL; | |
410 break; | |
411 } | |
412 // The evm code reset the hint of the candidate as | |
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413 // at an interim point. Why? Seems like this leaves |
0 | 414 // the hint pointing to a list that didn't work. |
415 // curTL->set_hint(hintTL->size()); | |
416 } | |
417 } | |
418 } | |
419 // don't waste time splaying if chunk's singleton | |
420 if (splay && curTL->head()->next() != NULL) { | |
421 semiSplayStep(curTL); | |
422 } | |
423 retTC = curTL->first_available(); | |
424 assert((retTC != NULL) && (curTL->count() > 0), | |
425 "A list in the binary tree should not be NULL"); | |
426 assert(retTC->size() >= size, | |
427 "A chunk of the wrong size was found"); | |
428 removeChunkFromTree(retTC); | |
429 assert(retTC->isFree(), "Header is not marked correctly"); | |
430 } | |
431 | |
432 if (FLSVerifyDictionary) { | |
433 verify(); | |
434 } | |
435 return retTC; | |
436 } | |
437 | |
438 TreeList* BinaryTreeDictionary::findList(size_t size) const { | |
439 TreeList* curTL; | |
440 for (curTL = root(); curTL != NULL;) { | |
441 if (curTL->size() == size) { // exact match | |
442 break; | |
443 } | |
444 | |
445 if (curTL->size() < size) { // proceed to right sub-tree | |
446 curTL = curTL->right(); | |
447 } else { // proceed to left sub-tree | |
448 assert(curTL->size() > size, "size inconsistency"); | |
449 curTL = curTL->left(); | |
450 } | |
451 } | |
452 return curTL; | |
453 } | |
454 | |
455 | |
456 bool BinaryTreeDictionary::verifyChunkInFreeLists(FreeChunk* tc) const { | |
457 size_t size = tc->size(); | |
458 TreeList* tl = findList(size); | |
459 if (tl == NULL) { | |
460 return false; | |
461 } else { | |
462 return tl->verifyChunkInFreeLists(tc); | |
463 } | |
464 } | |
465 | |
466 FreeChunk* BinaryTreeDictionary::findLargestDict() const { | |
467 TreeList *curTL = root(); | |
468 if (curTL != NULL) { | |
469 while(curTL->right() != NULL) curTL = curTL->right(); | |
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470 return curTL->largest_address(); |
0 | 471 } else { |
472 return NULL; | |
473 } | |
474 } | |
475 | |
476 // Remove the current chunk from the tree. If it is not the last | |
477 // chunk in a list on a tree node, just unlink it. | |
478 // If it is the last chunk in the list (the next link is NULL), | |
479 // remove the node and repair the tree. | |
480 TreeChunk* | |
481 BinaryTreeDictionary::removeChunkFromTree(TreeChunk* tc) { | |
482 assert(tc != NULL, "Should not call with a NULL chunk"); | |
483 assert(tc->isFree(), "Header is not marked correctly"); | |
484 | |
485 TreeList *newTL, *parentTL; | |
486 TreeChunk* retTC; | |
487 TreeList* tl = tc->list(); | |
488 debug_only( | |
489 bool removing_only_chunk = false; | |
490 if (tl == _root) { | |
491 if ((_root->left() == NULL) && (_root->right() == NULL)) { | |
492 if (_root->count() == 1) { | |
493 assert(_root->head() == tc, "Should only be this one chunk"); | |
494 removing_only_chunk = true; | |
495 } | |
496 } | |
497 } | |
498 ) | |
499 assert(tl != NULL, "List should be set"); | |
500 assert(tl->parent() == NULL || tl == tl->parent()->left() || | |
501 tl == tl->parent()->right(), "list is inconsistent"); | |
502 | |
503 bool complicatedSplice = false; | |
504 | |
505 retTC = tc; | |
506 // Removing this chunk can have the side effect of changing the node | |
507 // (TreeList*) in the tree. If the node is the root, update it. | |
508 TreeList* replacementTL = tl->removeChunkReplaceIfNeeded(tc); | |
509 assert(tc->isFree(), "Chunk should still be free"); | |
510 assert(replacementTL->parent() == NULL || | |
511 replacementTL == replacementTL->parent()->left() || | |
512 replacementTL == replacementTL->parent()->right(), | |
513 "list is inconsistent"); | |
514 if (tl == root()) { | |
515 assert(replacementTL->parent() == NULL, "Incorrectly replacing root"); | |
516 set_root(replacementTL); | |
517 } | |
518 debug_only( | |
519 if (tl != replacementTL) { | |
520 assert(replacementTL->head() != NULL, | |
521 "If the tree list was replaced, it should not be a NULL list"); | |
522 TreeList* rhl = replacementTL->head_as_TreeChunk()->list(); | |
523 TreeList* rtl = TreeChunk::as_TreeChunk(replacementTL->tail())->list(); | |
524 assert(rhl == replacementTL, "Broken head"); | |
525 assert(rtl == replacementTL, "Broken tail"); | |
526 assert(replacementTL->size() == tc->size(), "Broken size"); | |
527 } | |
528 ) | |
529 | |
530 // Does the tree need to be repaired? | |
531 if (replacementTL->count() == 0) { | |
532 assert(replacementTL->head() == NULL && | |
533 replacementTL->tail() == NULL, "list count is incorrect"); | |
534 // Find the replacement node for the (soon to be empty) node being removed. | |
535 // if we have a single (or no) child, splice child in our stead | |
536 if (replacementTL->left() == NULL) { | |
537 // left is NULL so pick right. right may also be NULL. | |
538 newTL = replacementTL->right(); | |
539 debug_only(replacementTL->clearRight();) | |
540 } else if (replacementTL->right() == NULL) { | |
541 // right is NULL | |
542 newTL = replacementTL->left(); | |
543 debug_only(replacementTL->clearLeft();) | |
544 } else { // we have both children, so, by patriarchal convention, | |
545 // my replacement is least node in right sub-tree | |
546 complicatedSplice = true; | |
547 newTL = removeTreeMinimum(replacementTL->right()); | |
548 assert(newTL != NULL && newTL->left() == NULL && | |
549 newTL->right() == NULL, "sub-tree minimum exists"); | |
550 } | |
551 // newTL is the replacement for the (soon to be empty) node. | |
552 // newTL may be NULL. | |
553 // should verify; we just cleanly excised our replacement | |
554 if (FLSVerifyDictionary) { | |
555 verifyTree(); | |
556 } | |
557 // first make newTL my parent's child | |
558 if ((parentTL = replacementTL->parent()) == NULL) { | |
559 // newTL should be root | |
560 assert(tl == root(), "Incorrectly replacing root"); | |
561 set_root(newTL); | |
562 if (newTL != NULL) { | |
563 newTL->clearParent(); | |
564 } | |
565 } else if (parentTL->right() == replacementTL) { | |
566 // replacementTL is a right child | |
567 parentTL->setRight(newTL); | |
568 } else { // replacementTL is a left child | |
569 assert(parentTL->left() == replacementTL, "should be left child"); | |
570 parentTL->setLeft(newTL); | |
571 } | |
572 debug_only(replacementTL->clearParent();) | |
573 if (complicatedSplice) { // we need newTL to get replacementTL's | |
574 // two children | |
575 assert(newTL != NULL && | |
576 newTL->left() == NULL && newTL->right() == NULL, | |
577 "newTL should not have encumbrances from the past"); | |
578 // we'd like to assert as below: | |
579 // assert(replacementTL->left() != NULL && replacementTL->right() != NULL, | |
580 // "else !complicatedSplice"); | |
581 // ... however, the above assertion is too strong because we aren't | |
582 // guaranteed that replacementTL->right() is still NULL. | |
583 // Recall that we removed | |
584 // the right sub-tree minimum from replacementTL. | |
585 // That may well have been its right | |
586 // child! So we'll just assert half of the above: | |
587 assert(replacementTL->left() != NULL, "else !complicatedSplice"); | |
588 newTL->setLeft(replacementTL->left()); | |
589 newTL->setRight(replacementTL->right()); | |
590 debug_only( | |
591 replacementTL->clearRight(); | |
592 replacementTL->clearLeft(); | |
593 ) | |
594 } | |
595 assert(replacementTL->right() == NULL && | |
596 replacementTL->left() == NULL && | |
597 replacementTL->parent() == NULL, | |
598 "delete without encumbrances"); | |
599 } | |
600 | |
601 assert(totalSize() >= retTC->size(), "Incorrect total size"); | |
602 dec_totalSize(retTC->size()); // size book-keeping | |
603 assert(totalFreeBlocks() > 0, "Incorrect total count"); | |
604 set_totalFreeBlocks(totalFreeBlocks() - 1); | |
605 | |
606 assert(retTC != NULL, "null chunk?"); | |
607 assert(retTC->prev() == NULL && retTC->next() == NULL, | |
608 "should return without encumbrances"); | |
609 if (FLSVerifyDictionary) { | |
610 verifyTree(); | |
611 } | |
612 assert(!removing_only_chunk || _root == NULL, "root should be NULL"); | |
613 return TreeChunk::as_TreeChunk(retTC); | |
614 } | |
615 | |
616 // Remove the leftmost node (lm) in the tree and return it. | |
617 // If lm has a right child, link it to the left node of | |
618 // the parent of lm. | |
619 TreeList* BinaryTreeDictionary::removeTreeMinimum(TreeList* tl) { | |
620 assert(tl != NULL && tl->parent() != NULL, "really need a proper sub-tree"); | |
621 // locate the subtree minimum by walking down left branches | |
622 TreeList* curTL = tl; | |
623 for (; curTL->left() != NULL; curTL = curTL->left()); | |
624 // obviously curTL now has at most one child, a right child | |
625 if (curTL != root()) { // Should this test just be removed? | |
626 TreeList* parentTL = curTL->parent(); | |
627 if (parentTL->left() == curTL) { // curTL is a left child | |
628 parentTL->setLeft(curTL->right()); | |
629 } else { | |
630 // If the list tl has no left child, then curTL may be | |
631 // the right child of parentTL. | |
632 assert(parentTL->right() == curTL, "should be a right child"); | |
633 parentTL->setRight(curTL->right()); | |
634 } | |
635 } else { | |
636 // The only use of this method would not pass the root of the | |
637 // tree (as indicated by the assertion above that the tree list | |
638 // has a parent) but the specification does not explicitly exclude the | |
639 // passing of the root so accomodate it. | |
640 set_root(NULL); | |
641 } | |
642 debug_only( | |
643 curTL->clearParent(); // Test if this needs to be cleared | |
644 curTL->clearRight(); // recall, above, left child is already null | |
645 ) | |
646 // we just excised a (non-root) node, we should still verify all tree invariants | |
647 if (FLSVerifyDictionary) { | |
648 verifyTree(); | |
649 } | |
650 return curTL; | |
651 } | |
652 | |
653 // Based on a simplification of the algorithm by Sleator and Tarjan (JACM 1985). | |
654 // The simplifications are the following: | |
655 // . we splay only when we delete (not when we insert) | |
656 // . we apply a single spay step per deletion/access | |
657 // By doing such partial splaying, we reduce the amount of restructuring, | |
658 // while getting a reasonably efficient search tree (we think). | |
659 // [Measurements will be needed to (in)validate this expectation.] | |
660 | |
661 void BinaryTreeDictionary::semiSplayStep(TreeList* tc) { | |
662 // apply a semi-splay step at the given node: | |
663 // . if root, norting needs to be done | |
664 // . if child of root, splay once | |
665 // . else zig-zig or sig-zag depending on path from grandparent | |
666 if (root() == tc) return; | |
667 warning("*** Splaying not yet implemented; " | |
668 "tree operations may be inefficient ***"); | |
669 } | |
670 | |
671 void BinaryTreeDictionary::insertChunkInTree(FreeChunk* fc) { | |
672 TreeList *curTL, *prevTL; | |
673 size_t size = fc->size(); | |
674 | |
675 assert(size >= MIN_TREE_CHUNK_SIZE, "too small to be a TreeList"); | |
676 if (FLSVerifyDictionary) { | |
677 verifyTree(); | |
678 } | |
679 // XXX: do i need to clear the FreeChunk fields, let me do it just in case | |
680 // Revisit this later | |
681 | |
682 fc->clearNext(); | |
683 fc->linkPrev(NULL); | |
684 | |
685 // work down from the _root, looking for insertion point | |
686 for (prevTL = curTL = root(); curTL != NULL;) { | |
687 if (curTL->size() == size) // exact match | |
688 break; | |
689 prevTL = curTL; | |
690 if (curTL->size() > size) { // follow left branch | |
691 curTL = curTL->left(); | |
692 } else { // follow right branch | |
693 assert(curTL->size() < size, "size inconsistency"); | |
694 curTL = curTL->right(); | |
695 } | |
696 } | |
697 TreeChunk* tc = TreeChunk::as_TreeChunk(fc); | |
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698 // This chunk is being returned to the binary tree. Its embedded |
0 | 699 // TreeList should be unused at this point. |
700 tc->initialize(); | |
701 if (curTL != NULL) { // exact match | |
702 tc->set_list(curTL); | |
703 curTL->returnChunkAtTail(tc); | |
704 } else { // need a new node in tree | |
705 tc->clearNext(); | |
706 tc->linkPrev(NULL); | |
707 TreeList* newTL = TreeList::as_TreeList(tc); | |
708 assert(((TreeChunk*)tc)->list() == newTL, | |
709 "List was not initialized correctly"); | |
710 if (prevTL == NULL) { // we are the only tree node | |
711 assert(root() == NULL, "control point invariant"); | |
712 set_root(newTL); | |
713 } else { // insert under prevTL ... | |
714 if (prevTL->size() < size) { // am right child | |
715 assert(prevTL->right() == NULL, "control point invariant"); | |
716 prevTL->setRight(newTL); | |
717 } else { // am left child | |
718 assert(prevTL->size() > size && prevTL->left() == NULL, "cpt pt inv"); | |
719 prevTL->setLeft(newTL); | |
720 } | |
721 } | |
722 } | |
723 assert(tc->list() != NULL, "Tree list should be set"); | |
724 | |
725 inc_totalSize(size); | |
726 // Method 'totalSizeInTree' walks through the every block in the | |
727 // tree, so it can cause significant performance loss if there are | |
728 // many blocks in the tree | |
729 assert(!FLSVerifyDictionary || totalSizeInTree(root()) == totalSize(), "_totalSize inconsistency"); | |
730 set_totalFreeBlocks(totalFreeBlocks() + 1); | |
731 if (FLSVerifyDictionary) { | |
732 verifyTree(); | |
733 } | |
734 } | |
735 | |
736 size_t BinaryTreeDictionary::maxChunkSize() const { | |
737 verify_par_locked(); | |
738 TreeList* tc = root(); | |
739 if (tc == NULL) return 0; | |
740 for (; tc->right() != NULL; tc = tc->right()); | |
741 return tc->size(); | |
742 } | |
743 | |
744 size_t BinaryTreeDictionary::totalListLength(TreeList* tl) const { | |
745 size_t res; | |
746 res = tl->count(); | |
747 #ifdef ASSERT | |
748 size_t cnt; | |
749 FreeChunk* tc = tl->head(); | |
750 for (cnt = 0; tc != NULL; tc = tc->next(), cnt++); | |
751 assert(res == cnt, "The count is not being maintained correctly"); | |
752 #endif | |
753 return res; | |
754 } | |
755 | |
756 size_t BinaryTreeDictionary::totalSizeInTree(TreeList* tl) const { | |
757 if (tl == NULL) | |
758 return 0; | |
759 return (tl->size() * totalListLength(tl)) + | |
760 totalSizeInTree(tl->left()) + | |
761 totalSizeInTree(tl->right()); | |
762 } | |
763 | |
764 double BinaryTreeDictionary::sum_of_squared_block_sizes(TreeList* const tl) const { | |
765 if (tl == NULL) { | |
766 return 0.0; | |
767 } | |
768 double size = (double)(tl->size()); | |
769 double curr = size * size * totalListLength(tl); | |
770 curr += sum_of_squared_block_sizes(tl->left()); | |
771 curr += sum_of_squared_block_sizes(tl->right()); | |
772 return curr; | |
773 } | |
774 | |
775 size_t BinaryTreeDictionary::totalFreeBlocksInTree(TreeList* tl) const { | |
776 if (tl == NULL) | |
777 return 0; | |
778 return totalListLength(tl) + | |
779 totalFreeBlocksInTree(tl->left()) + | |
780 totalFreeBlocksInTree(tl->right()); | |
781 } | |
782 | |
783 size_t BinaryTreeDictionary::numFreeBlocks() const { | |
784 assert(totalFreeBlocksInTree(root()) == totalFreeBlocks(), | |
785 "_totalFreeBlocks inconsistency"); | |
786 return totalFreeBlocks(); | |
787 } | |
788 | |
789 size_t BinaryTreeDictionary::treeHeightHelper(TreeList* tl) const { | |
790 if (tl == NULL) | |
791 return 0; | |
792 return 1 + MAX2(treeHeightHelper(tl->left()), | |
793 treeHeightHelper(tl->right())); | |
794 } | |
795 | |
796 size_t BinaryTreeDictionary::treeHeight() const { | |
797 return treeHeightHelper(root()); | |
798 } | |
799 | |
800 size_t BinaryTreeDictionary::totalNodesHelper(TreeList* tl) const { | |
801 if (tl == NULL) { | |
802 return 0; | |
803 } | |
804 return 1 + totalNodesHelper(tl->left()) + | |
805 totalNodesHelper(tl->right()); | |
806 } | |
807 | |
808 size_t BinaryTreeDictionary::totalNodesInTree(TreeList* tl) const { | |
809 return totalNodesHelper(root()); | |
810 } | |
811 | |
812 void BinaryTreeDictionary::dictCensusUpdate(size_t size, bool split, bool birth){ | |
813 TreeList* nd = findList(size); | |
814 if (nd) { | |
815 if (split) { | |
816 if (birth) { | |
817 nd->increment_splitBirths(); | |
818 nd->increment_surplus(); | |
819 } else { | |
820 nd->increment_splitDeaths(); | |
821 nd->decrement_surplus(); | |
822 } | |
823 } else { | |
824 if (birth) { | |
825 nd->increment_coalBirths(); | |
826 nd->increment_surplus(); | |
827 } else { | |
828 nd->increment_coalDeaths(); | |
829 nd->decrement_surplus(); | |
830 } | |
831 } | |
832 } | |
833 // A list for this size may not be found (nd == 0) if | |
834 // This is a death where the appropriate list is now | |
835 // empty and has been removed from the list. | |
836 // This is a birth associated with a LinAB. The chunk | |
837 // for the LinAB is not in the dictionary. | |
838 } | |
839 | |
840 bool BinaryTreeDictionary::coalDictOverPopulated(size_t size) { | |
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841 if (FLSAlwaysCoalesceLarge) return true; |
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842 |
0 | 843 TreeList* list_of_size = findList(size); |
844 // None of requested size implies overpopulated. | |
845 return list_of_size == NULL || list_of_size->coalDesired() <= 0 || | |
846 list_of_size->count() > list_of_size->coalDesired(); | |
847 } | |
848 | |
849 // Closures for walking the binary tree. | |
850 // do_list() walks the free list in a node applying the closure | |
851 // to each free chunk in the list | |
852 // do_tree() walks the nodes in the binary tree applying do_list() | |
853 // to each list at each node. | |
854 | |
855 class TreeCensusClosure : public StackObj { | |
856 protected: | |
857 virtual void do_list(FreeList* fl) = 0; | |
858 public: | |
859 virtual void do_tree(TreeList* tl) = 0; | |
860 }; | |
861 | |
862 class AscendTreeCensusClosure : public TreeCensusClosure { | |
863 public: | |
864 void do_tree(TreeList* tl) { | |
865 if (tl != NULL) { | |
866 do_tree(tl->left()); | |
867 do_list(tl); | |
868 do_tree(tl->right()); | |
869 } | |
870 } | |
871 }; | |
872 | |
873 class DescendTreeCensusClosure : public TreeCensusClosure { | |
874 public: | |
875 void do_tree(TreeList* tl) { | |
876 if (tl != NULL) { | |
877 do_tree(tl->right()); | |
878 do_list(tl); | |
879 do_tree(tl->left()); | |
880 } | |
881 } | |
882 }; | |
883 | |
884 // For each list in the tree, calculate the desired, desired | |
885 // coalesce, count before sweep, and surplus before sweep. | |
886 class BeginSweepClosure : public AscendTreeCensusClosure { | |
887 double _percentage; | |
888 float _inter_sweep_current; | |
889 float _inter_sweep_estimate; | |
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890 float _intra_sweep_estimate; |
0 | 891 |
892 public: | |
893 BeginSweepClosure(double p, float inter_sweep_current, | |
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894 float inter_sweep_estimate, |
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895 float intra_sweep_estimate) : |
0 | 896 _percentage(p), |
897 _inter_sweep_current(inter_sweep_current), | |
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898 _inter_sweep_estimate(inter_sweep_estimate), |
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899 _intra_sweep_estimate(intra_sweep_estimate) { } |
0 | 900 |
901 void do_list(FreeList* fl) { | |
902 double coalSurplusPercent = _percentage; | |
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903 fl->compute_desired(_inter_sweep_current, _inter_sweep_estimate, _intra_sweep_estimate); |
0 | 904 fl->set_coalDesired((ssize_t)((double)fl->desired() * coalSurplusPercent)); |
905 fl->set_beforeSweep(fl->count()); | |
906 fl->set_bfrSurp(fl->surplus()); | |
907 } | |
908 }; | |
909 | |
910 // Used to search the tree until a condition is met. | |
911 // Similar to TreeCensusClosure but searches the | |
912 // tree and returns promptly when found. | |
913 | |
914 class TreeSearchClosure : public StackObj { | |
915 protected: | |
916 virtual bool do_list(FreeList* fl) = 0; | |
917 public: | |
918 virtual bool do_tree(TreeList* tl) = 0; | |
919 }; | |
920 | |
921 #if 0 // Don't need this yet but here for symmetry. | |
922 class AscendTreeSearchClosure : public TreeSearchClosure { | |
923 public: | |
924 bool do_tree(TreeList* tl) { | |
925 if (tl != NULL) { | |
926 if (do_tree(tl->left())) return true; | |
927 if (do_list(tl)) return true; | |
928 if (do_tree(tl->right())) return true; | |
929 } | |
930 return false; | |
931 } | |
932 }; | |
933 #endif | |
934 | |
935 class DescendTreeSearchClosure : public TreeSearchClosure { | |
936 public: | |
937 bool do_tree(TreeList* tl) { | |
938 if (tl != NULL) { | |
939 if (do_tree(tl->right())) return true; | |
940 if (do_list(tl)) return true; | |
941 if (do_tree(tl->left())) return true; | |
942 } | |
943 return false; | |
944 } | |
945 }; | |
946 | |
947 // Searches the tree for a chunk that ends at the | |
948 // specified address. | |
949 class EndTreeSearchClosure : public DescendTreeSearchClosure { | |
950 HeapWord* _target; | |
951 FreeChunk* _found; | |
952 | |
953 public: | |
954 EndTreeSearchClosure(HeapWord* target) : _target(target), _found(NULL) {} | |
955 bool do_list(FreeList* fl) { | |
956 FreeChunk* item = fl->head(); | |
957 while (item != NULL) { | |
958 if (item->end() == _target) { | |
959 _found = item; | |
960 return true; | |
961 } | |
962 item = item->next(); | |
963 } | |
964 return false; | |
965 } | |
966 FreeChunk* found() { return _found; } | |
967 }; | |
968 | |
969 FreeChunk* BinaryTreeDictionary::find_chunk_ends_at(HeapWord* target) const { | |
970 EndTreeSearchClosure etsc(target); | |
971 bool found_target = etsc.do_tree(root()); | |
972 assert(found_target || etsc.found() == NULL, "Consistency check"); | |
973 assert(!found_target || etsc.found() != NULL, "Consistency check"); | |
974 return etsc.found(); | |
975 } | |
976 | |
977 void BinaryTreeDictionary::beginSweepDictCensus(double coalSurplusPercent, | |
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978 float inter_sweep_current, float inter_sweep_estimate, float intra_sweep_estimate) { |
0 | 979 BeginSweepClosure bsc(coalSurplusPercent, inter_sweep_current, |
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980 inter_sweep_estimate, |
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981 intra_sweep_estimate); |
0 | 982 bsc.do_tree(root()); |
983 } | |
984 | |
985 // Closures and methods for calculating total bytes returned to the | |
986 // free lists in the tree. | |
987 NOT_PRODUCT( | |
988 class InitializeDictReturnedBytesClosure : public AscendTreeCensusClosure { | |
989 public: | |
990 void do_list(FreeList* fl) { | |
991 fl->set_returnedBytes(0); | |
992 } | |
993 }; | |
994 | |
995 void BinaryTreeDictionary::initializeDictReturnedBytes() { | |
996 InitializeDictReturnedBytesClosure idrb; | |
997 idrb.do_tree(root()); | |
998 } | |
999 | |
1000 class ReturnedBytesClosure : public AscendTreeCensusClosure { | |
1001 size_t _dictReturnedBytes; | |
1002 public: | |
1003 ReturnedBytesClosure() { _dictReturnedBytes = 0; } | |
1004 void do_list(FreeList* fl) { | |
1005 _dictReturnedBytes += fl->returnedBytes(); | |
1006 } | |
1007 size_t dictReturnedBytes() { return _dictReturnedBytes; } | |
1008 }; | |
1009 | |
1010 size_t BinaryTreeDictionary::sumDictReturnedBytes() { | |
1011 ReturnedBytesClosure rbc; | |
1012 rbc.do_tree(root()); | |
1013 | |
1014 return rbc.dictReturnedBytes(); | |
1015 } | |
1016 | |
1017 // Count the number of entries in the tree. | |
1018 class treeCountClosure : public DescendTreeCensusClosure { | |
1019 public: | |
1020 uint count; | |
1021 treeCountClosure(uint c) { count = c; } | |
1022 void do_list(FreeList* fl) { | |
1023 count++; | |
1024 } | |
1025 }; | |
1026 | |
1027 size_t BinaryTreeDictionary::totalCount() { | |
1028 treeCountClosure ctc(0); | |
1029 ctc.do_tree(root()); | |
1030 return ctc.count; | |
1031 } | |
1032 ) | |
1033 | |
1034 // Calculate surpluses for the lists in the tree. | |
1035 class setTreeSurplusClosure : public AscendTreeCensusClosure { | |
1036 double percentage; | |
1037 public: | |
1038 setTreeSurplusClosure(double v) { percentage = v; } | |
1039 void do_list(FreeList* fl) { | |
1040 double splitSurplusPercent = percentage; | |
1041 fl->set_surplus(fl->count() - | |
1042 (ssize_t)((double)fl->desired() * splitSurplusPercent)); | |
1043 } | |
1044 }; | |
1045 | |
1046 void BinaryTreeDictionary::setTreeSurplus(double splitSurplusPercent) { | |
1047 setTreeSurplusClosure sts(splitSurplusPercent); | |
1048 sts.do_tree(root()); | |
1049 } | |
1050 | |
1051 // Set hints for the lists in the tree. | |
1052 class setTreeHintsClosure : public DescendTreeCensusClosure { | |
1053 size_t hint; | |
1054 public: | |
1055 setTreeHintsClosure(size_t v) { hint = v; } | |
1056 void do_list(FreeList* fl) { | |
1057 fl->set_hint(hint); | |
1058 assert(fl->hint() == 0 || fl->hint() > fl->size(), | |
1059 "Current hint is inconsistent"); | |
1060 if (fl->surplus() > 0) { | |
1061 hint = fl->size(); | |
1062 } | |
1063 } | |
1064 }; | |
1065 | |
1066 void BinaryTreeDictionary::setTreeHints(void) { | |
1067 setTreeHintsClosure sth(0); | |
1068 sth.do_tree(root()); | |
1069 } | |
1070 | |
1071 // Save count before previous sweep and splits and coalesces. | |
1072 class clearTreeCensusClosure : public AscendTreeCensusClosure { | |
1073 void do_list(FreeList* fl) { | |
1074 fl->set_prevSweep(fl->count()); | |
1075 fl->set_coalBirths(0); | |
1076 fl->set_coalDeaths(0); | |
1077 fl->set_splitBirths(0); | |
1078 fl->set_splitDeaths(0); | |
1079 } | |
1080 }; | |
1081 | |
1082 void BinaryTreeDictionary::clearTreeCensus(void) { | |
1083 clearTreeCensusClosure ctc; | |
1084 ctc.do_tree(root()); | |
1085 } | |
1086 | |
1087 // Do reporting and post sweep clean up. | |
1088 void BinaryTreeDictionary::endSweepDictCensus(double splitSurplusPercent) { | |
1089 // Does walking the tree 3 times hurt? | |
1090 setTreeSurplus(splitSurplusPercent); | |
1091 setTreeHints(); | |
1092 if (PrintGC && Verbose) { | |
1093 reportStatistics(); | |
1094 } | |
1095 clearTreeCensus(); | |
1096 } | |
1097 | |
1098 // Print summary statistics | |
1099 void BinaryTreeDictionary::reportStatistics() const { | |
1100 verify_par_locked(); | |
1101 gclog_or_tty->print("Statistics for BinaryTreeDictionary:\n" | |
1102 "------------------------------------\n"); | |
1103 size_t totalSize = totalChunkSize(debug_only(NULL)); | |
1104 size_t freeBlocks = numFreeBlocks(); | |
1105 gclog_or_tty->print("Total Free Space: %d\n", totalSize); | |
1106 gclog_or_tty->print("Max Chunk Size: %d\n", maxChunkSize()); | |
1107 gclog_or_tty->print("Number of Blocks: %d\n", freeBlocks); | |
1108 if (freeBlocks > 0) { | |
1109 gclog_or_tty->print("Av. Block Size: %d\n", totalSize/freeBlocks); | |
1110 } | |
1111 gclog_or_tty->print("Tree Height: %d\n", treeHeight()); | |
1112 } | |
1113 | |
1114 // Print census information - counts, births, deaths, etc. | |
1115 // for each list in the tree. Also print some summary | |
1116 // information. | |
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1117 class PrintTreeCensusClosure : public AscendTreeCensusClosure { |
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1118 int _print_line; |
0 | 1119 size_t _totalFree; |
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1120 FreeList _total; |
0 | 1121 |
1122 public: | |
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1123 PrintTreeCensusClosure() { |
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1124 _print_line = 0; |
0 | 1125 _totalFree = 0; |
1126 } | |
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1127 FreeList* total() { return &_total; } |
0 | 1128 size_t totalFree() { return _totalFree; } |
1129 void do_list(FreeList* fl) { | |
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1130 if (++_print_line >= 40) { |
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1131 FreeList::print_labels_on(gclog_or_tty, "size"); |
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1132 _print_line = 0; |
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1133 } |
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1134 fl->print_on(gclog_or_tty); |
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1135 _totalFree += fl->count() * fl->size() ; |
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1136 total()->set_count( total()->count() + fl->count() ); |
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1137 total()->set_bfrSurp( total()->bfrSurp() + fl->bfrSurp() ); |
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1138 total()->set_surplus( total()->splitDeaths() + fl->surplus() ); |
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1139 total()->set_desired( total()->desired() + fl->desired() ); |
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1140 total()->set_prevSweep( total()->prevSweep() + fl->prevSweep() ); |
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1141 total()->set_beforeSweep(total()->beforeSweep() + fl->beforeSweep()); |
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1142 total()->set_coalBirths( total()->coalBirths() + fl->coalBirths() ); |
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1143 total()->set_coalDeaths( total()->coalDeaths() + fl->coalDeaths() ); |
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1144 total()->set_splitBirths(total()->splitBirths() + fl->splitBirths()); |
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1145 total()->set_splitDeaths(total()->splitDeaths() + fl->splitDeaths()); |
0 | 1146 } |
1147 }; | |
1148 | |
1149 void BinaryTreeDictionary::printDictCensus(void) const { | |
1150 | |
1151 gclog_or_tty->print("\nBinaryTree\n"); | |
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1152 FreeList::print_labels_on(gclog_or_tty, "size"); |
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1153 PrintTreeCensusClosure ptc; |
0 | 1154 ptc.do_tree(root()); |
1155 | |
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1156 FreeList* total = ptc.total(); |
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1157 FreeList::print_labels_on(gclog_or_tty, " "); |
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1158 total->print_on(gclog_or_tty, "TOTAL\t"); |
0 | 1159 gclog_or_tty->print( |
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1160 "totalFree(words): " SIZE_FORMAT_W(16) |
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1161 " growth: %8.5f deficit: %8.5f\n", |
0 | 1162 ptc.totalFree(), |
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1163 (double)(total->splitBirths() + total->coalBirths() |
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1164 - total->splitDeaths() - total->coalDeaths()) |
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1165 /(total->prevSweep() != 0 ? (double)total->prevSweep() : 1.0), |
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1166 (double)(total->desired() - total->count()) |
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1167 /(total->desired() != 0 ? (double)total->desired() : 1.0)); |
0 | 1168 } |
1169 | |
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1170 class PrintFreeListsClosure : public AscendTreeCensusClosure { |
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1171 outputStream* _st; |
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1172 int _print_line; |
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1173 |
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1174 public: |
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1175 PrintFreeListsClosure(outputStream* st) { |
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1176 _st = st; |
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1177 _print_line = 0; |
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1178 } |
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1179 void do_list(FreeList* fl) { |
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1180 if (++_print_line >= 40) { |
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1181 FreeList::print_labels_on(_st, "size"); |
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1182 _print_line = 0; |
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1183 } |
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1184 fl->print_on(gclog_or_tty); |
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1185 size_t sz = fl->size(); |
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1186 for (FreeChunk* fc = fl->head(); fc != NULL; |
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1187 fc = fc->next()) { |
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1188 _st->print_cr("\t[" PTR_FORMAT "," PTR_FORMAT ") %s", |
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1189 fc, (HeapWord*)fc + sz, |
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1190 fc->cantCoalesce() ? "\t CC" : ""); |
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1191 } |
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1192 } |
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1193 }; |
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1194 |
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1195 void BinaryTreeDictionary::print_free_lists(outputStream* st) const { |
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1196 |
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1197 FreeList::print_labels_on(st, "size"); |
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1198 PrintFreeListsClosure pflc(st); |
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1199 pflc.do_tree(root()); |
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1200 } |
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1201 |
0 | 1202 // Verify the following tree invariants: |
1203 // . _root has no parent | |
1204 // . parent and child point to each other | |
1205 // . each node's key correctly related to that of its child(ren) | |
1206 void BinaryTreeDictionary::verifyTree() const { | |
1207 guarantee(root() == NULL || totalFreeBlocks() == 0 || | |
1208 totalSize() != 0, "_totalSize should't be 0?"); | |
1209 guarantee(root() == NULL || root()->parent() == NULL, "_root shouldn't have parent"); | |
1210 verifyTreeHelper(root()); | |
1211 } | |
1212 | |
1213 size_t BinaryTreeDictionary::verifyPrevFreePtrs(TreeList* tl) { | |
1214 size_t ct = 0; | |
1215 for (FreeChunk* curFC = tl->head(); curFC != NULL; curFC = curFC->next()) { | |
1216 ct++; | |
1217 assert(curFC->prev() == NULL || curFC->prev()->isFree(), | |
1218 "Chunk should be free"); | |
1219 } | |
1220 return ct; | |
1221 } | |
1222 | |
1223 // Note: this helper is recursive rather than iterative, so use with | |
1224 // caution on very deep trees; and watch out for stack overflow errors; | |
1225 // In general, to be used only for debugging. | |
1226 void BinaryTreeDictionary::verifyTreeHelper(TreeList* tl) const { | |
1227 if (tl == NULL) | |
1228 return; | |
1229 guarantee(tl->size() != 0, "A list must has a size"); | |
1230 guarantee(tl->left() == NULL || tl->left()->parent() == tl, | |
1231 "parent<-/->left"); | |
1232 guarantee(tl->right() == NULL || tl->right()->parent() == tl, | |
1233 "parent<-/->right");; | |
1234 guarantee(tl->left() == NULL || tl->left()->size() < tl->size(), | |
1235 "parent !> left"); | |
1236 guarantee(tl->right() == NULL || tl->right()->size() > tl->size(), | |
1237 "parent !< left"); | |
1238 guarantee(tl->head() == NULL || tl->head()->isFree(), "!Free"); | |
1239 guarantee(tl->head() == NULL || tl->head_as_TreeChunk()->list() == tl, | |
1240 "list inconsistency"); | |
1241 guarantee(tl->count() > 0 || (tl->head() == NULL && tl->tail() == NULL), | |
1242 "list count is inconsistent"); | |
1243 guarantee(tl->count() > 1 || tl->head() == tl->tail(), | |
1244 "list is incorrectly constructed"); | |
1245 size_t count = verifyPrevFreePtrs(tl); | |
1246 guarantee(count == (size_t)tl->count(), "Node count is incorrect"); | |
1247 if (tl->head() != NULL) { | |
1248 tl->head_as_TreeChunk()->verifyTreeChunkList(); | |
1249 } | |
1250 verifyTreeHelper(tl->left()); | |
1251 verifyTreeHelper(tl->right()); | |
1252 } | |
1253 | |
1254 void BinaryTreeDictionary::verify() const { | |
1255 verifyTree(); | |
1256 guarantee(totalSize() == totalSizeInTree(root()), "Total Size inconsistency"); | |
1257 } |