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annotate src/share/vm/memory/space.hpp @ 20261:27188ae8bbbb
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author | stefank |
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date | Thu, 27 Feb 2014 10:34:55 +0100 |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2013, 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_MEMORY_SPACE_HPP |
26 #define SHARE_VM_MEMORY_SPACE_HPP | |
27 | |
28 #include "memory/allocation.hpp" | |
29 #include "memory/blockOffsetTable.hpp" | |
30 #include "memory/cardTableModRefBS.hpp" | |
31 #include "memory/iterator.hpp" | |
32 #include "memory/memRegion.hpp" | |
33 #include "memory/watermark.hpp" | |
34 #include "oops/markOop.hpp" | |
35 #include "runtime/mutexLocker.hpp" | |
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36 #include "utilities/macros.hpp" |
1972 | 37 #include "utilities/workgroup.hpp" |
38 | |
0 | 39 // A space is an abstraction for the "storage units" backing |
40 // up the generation abstraction. It includes specific | |
41 // implementations for keeping track of free and used space, | |
42 // for iterating over objects and free blocks, etc. | |
43 | |
44 // Here's the Space hierarchy: | |
45 // | |
46 // - Space -- an asbtract base class describing a heap area | |
47 // - CompactibleSpace -- a space supporting compaction | |
48 // - CompactibleFreeListSpace -- (used for CMS generation) | |
49 // - ContiguousSpace -- a compactible space in which all free space | |
50 // is contiguous | |
51 // - EdenSpace -- contiguous space used as nursery | |
52 // - ConcEdenSpace -- contiguous space with a 'soft end safe' allocation | |
53 // - OffsetTableContigSpace -- contiguous space with a block offset array | |
54 // that allows "fast" block_start calls | |
55 // - TenuredSpace -- (used for TenuredGeneration) | |
56 | |
57 // Forward decls. | |
58 class Space; | |
59 class BlockOffsetArray; | |
60 class BlockOffsetArrayContigSpace; | |
61 class Generation; | |
62 class CompactibleSpace; | |
63 class BlockOffsetTable; | |
64 class GenRemSet; | |
65 class CardTableRS; | |
66 class DirtyCardToOopClosure; | |
67 | |
68 // An oop closure that is circumscribed by a filtering memory region. | |
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69 class SpaceMemRegionOopsIterClosure: public ExtendedOopClosure { |
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70 private: |
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71 ExtendedOopClosure* _cl; |
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72 MemRegion _mr; |
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73 protected: |
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74 template <class T> void do_oop_work(T* p) { |
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75 if (_mr.contains(p)) { |
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76 _cl->do_oop(p); |
0 | 77 } |
78 } | |
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79 public: |
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80 SpaceMemRegionOopsIterClosure(ExtendedOopClosure* cl, MemRegion mr): |
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81 _cl(cl), _mr(mr) {} |
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82 virtual void do_oop(oop* p); |
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83 virtual void do_oop(narrowOop* p); |
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84 virtual bool do_metadata() { |
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85 // _cl is of type ExtendedOopClosure instead of OopClosure, so that we can check this. |
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86 assert(!_cl->do_metadata(), "I've checked all call paths, this shouldn't happen."); |
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87 return false; |
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88 } |
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89 virtual void do_klass(Klass* k) { ShouldNotReachHere(); } |
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90 virtual void do_class_loader_data(ClassLoaderData* cld) { ShouldNotReachHere(); } |
0 | 91 }; |
92 | |
93 // A Space describes a heap area. Class Space is an abstract | |
94 // base class. | |
95 // | |
96 // Space supports allocation, size computation and GC support is provided. | |
97 // | |
98 // Invariant: bottom() and end() are on page_size boundaries and | |
99 // bottom() <= top() <= end() | |
100 // top() is inclusive and end() is exclusive. | |
101 | |
6197 | 102 class Space: public CHeapObj<mtGC> { |
0 | 103 friend class VMStructs; |
104 protected: | |
105 HeapWord* _bottom; | |
106 HeapWord* _end; | |
107 | |
108 // Used in support of save_marks() | |
109 HeapWord* _saved_mark_word; | |
110 | |
111 MemRegionClosure* _preconsumptionDirtyCardClosure; | |
112 | |
113 // A sequential tasks done structure. This supports | |
114 // parallel GC, where we have threads dynamically | |
115 // claiming sub-tasks from a larger parallel task. | |
116 SequentialSubTasksDone _par_seq_tasks; | |
117 | |
118 Space(): | |
119 _bottom(NULL), _end(NULL), _preconsumptionDirtyCardClosure(NULL) { } | |
120 | |
121 public: | |
122 // Accessors | |
123 HeapWord* bottom() const { return _bottom; } | |
124 HeapWord* end() const { return _end; } | |
125 virtual void set_bottom(HeapWord* value) { _bottom = value; } | |
126 virtual void set_end(HeapWord* value) { _end = value; } | |
127 | |
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128 virtual HeapWord* saved_mark_word() const { return _saved_mark_word; } |
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129 |
0 | 130 void set_saved_mark_word(HeapWord* p) { _saved_mark_word = p; } |
131 | |
132 MemRegionClosure* preconsumptionDirtyCardClosure() const { | |
133 return _preconsumptionDirtyCardClosure; | |
134 } | |
135 void setPreconsumptionDirtyCardClosure(MemRegionClosure* cl) { | |
136 _preconsumptionDirtyCardClosure = cl; | |
137 } | |
138 | |
139 // Returns a subregion of the space containing all the objects in | |
140 // the space. | |
141 virtual MemRegion used_region() const { return MemRegion(bottom(), end()); } | |
142 | |
143 // Returns a region that is guaranteed to contain (at least) all objects | |
144 // allocated at the time of the last call to "save_marks". If the space | |
145 // initializes its DirtyCardToOopClosure's specifying the "contig" option | |
146 // (that is, if the space is contiguous), then this region must contain only | |
147 // such objects: the memregion will be from the bottom of the region to the | |
148 // saved mark. Otherwise, the "obj_allocated_since_save_marks" method of | |
149 // the space must distiguish between objects in the region allocated before | |
150 // and after the call to save marks. | |
151 virtual MemRegion used_region_at_save_marks() const { | |
152 return MemRegion(bottom(), saved_mark_word()); | |
153 } | |
154 | |
342
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155 // Initialization. |
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156 // "initialize" should be called once on a space, before it is used for |
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157 // any purpose. The "mr" arguments gives the bounds of the space, and |
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158 // the "clear_space" argument should be true unless the memory in "mr" is |
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159 // known to be zeroed. |
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160 virtual void initialize(MemRegion mr, bool clear_space, bool mangle_space); |
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161 |
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162 // The "clear" method must be called on a region that may have |
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163 // had allocation performed in it, but is now to be considered empty. |
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164 virtual void clear(bool mangle_space); |
0 | 165 |
166 // For detecting GC bugs. Should only be called at GC boundaries, since | |
167 // some unused space may be used as scratch space during GC's. | |
168 // Default implementation does nothing. We also call this when expanding | |
169 // a space to satisfy an allocation request. See bug #4668531 | |
170 virtual void mangle_unused_area() {} | |
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171 virtual void mangle_unused_area_complete() {} |
0 | 172 virtual void mangle_region(MemRegion mr) {} |
173 | |
174 // Testers | |
175 bool is_empty() const { return used() == 0; } | |
176 bool not_empty() const { return used() > 0; } | |
177 | |
178 // Returns true iff the given the space contains the | |
179 // given address as part of an allocated object. For | |
180 // ceratin kinds of spaces, this might be a potentially | |
181 // expensive operation. To prevent performance problems | |
182 // on account of its inadvertent use in product jvm's, | |
183 // we restrict its use to assertion checks only. | |
4708 | 184 virtual bool is_in(const void* p) const = 0; |
0 | 185 |
186 // Returns true iff the given reserved memory of the space contains the | |
187 // given address. | |
188 bool is_in_reserved(const void* p) const { return _bottom <= p && p < _end; } | |
189 | |
190 // Returns true iff the given block is not allocated. | |
191 virtual bool is_free_block(const HeapWord* p) const = 0; | |
192 | |
193 // Test whether p is double-aligned | |
194 static bool is_aligned(void* p) { | |
195 return ((intptr_t)p & (sizeof(double)-1)) == 0; | |
196 } | |
197 | |
198 // Size computations. Sizes are in bytes. | |
199 size_t capacity() const { return byte_size(bottom(), end()); } | |
200 virtual size_t used() const = 0; | |
201 virtual size_t free() const = 0; | |
202 | |
203 // Iterate over all the ref-containing fields of all objects in the | |
204 // space, calling "cl.do_oop" on each. Fields in objects allocated by | |
205 // applications of the closure are not included in the iteration. | |
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206 virtual void oop_iterate(ExtendedOopClosure* cl); |
0 | 207 |
208 // Same as above, restricted to the intersection of a memory region and | |
209 // the space. Fields in objects allocated by applications of the closure | |
210 // are not included in the iteration. | |
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211 virtual void oop_iterate(MemRegion mr, ExtendedOopClosure* cl) = 0; |
0 | 212 |
213 // Iterate over all objects in the space, calling "cl.do_object" on | |
214 // each. Objects allocated by applications of the closure are not | |
215 // included in the iteration. | |
216 virtual void object_iterate(ObjectClosure* blk) = 0; | |
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217 // Similar to object_iterate() except only iterates over |
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218 // objects whose internal references point to objects in the space. |
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219 virtual void safe_object_iterate(ObjectClosure* blk) = 0; |
0 | 220 |
221 // Iterate over all objects that intersect with mr, calling "cl->do_object" | |
222 // on each. There is an exception to this: if this closure has already | |
223 // been invoked on an object, it may skip such objects in some cases. This is | |
224 // Most likely to happen in an "upwards" (ascending address) iteration of | |
225 // MemRegions. | |
226 virtual void object_iterate_mem(MemRegion mr, UpwardsObjectClosure* cl); | |
227 | |
228 // Iterate over as many initialized objects in the space as possible, | |
229 // calling "cl.do_object_careful" on each. Return NULL if all objects | |
230 // in the space (at the start of the iteration) were iterated over. | |
231 // Return an address indicating the extent of the iteration in the | |
232 // event that the iteration had to return because of finding an | |
233 // uninitialized object in the space, or if the closure "cl" | |
234 // signalled early termination. | |
235 virtual HeapWord* object_iterate_careful(ObjectClosureCareful* cl); | |
236 virtual HeapWord* object_iterate_careful_m(MemRegion mr, | |
237 ObjectClosureCareful* cl); | |
238 | |
239 // Create and return a new dirty card to oop closure. Can be | |
240 // overriden to return the appropriate type of closure | |
241 // depending on the type of space in which the closure will | |
242 // operate. ResourceArea allocated. | |
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243 virtual DirtyCardToOopClosure* new_dcto_cl(ExtendedOopClosure* cl, |
0 | 244 CardTableModRefBS::PrecisionStyle precision, |
245 HeapWord* boundary = NULL); | |
246 | |
247 // If "p" is in the space, returns the address of the start of the | |
248 // "block" that contains "p". We say "block" instead of "object" since | |
249 // some heaps may not pack objects densely; a chunk may either be an | |
250 // object or a non-object. If "p" is not in the space, return NULL. | |
342
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251 virtual HeapWord* block_start_const(const void* p) const = 0; |
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252 |
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253 // The non-const version may have benevolent side effects on the data |
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254 // structure supporting these calls, possibly speeding up future calls. |
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255 // The default implementation, however, is simply to call the const |
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256 // version. |
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257 inline virtual HeapWord* block_start(const void* p); |
0 | 258 |
259 // Requires "addr" to be the start of a chunk, and returns its size. | |
260 // "addr + size" is required to be the start of a new chunk, or the end | |
261 // of the active area of the heap. | |
262 virtual size_t block_size(const HeapWord* addr) const = 0; | |
263 | |
264 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
265 // the block is an object. | |
266 virtual bool block_is_obj(const HeapWord* addr) const = 0; | |
267 | |
268 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
269 // the block is an object and the object is alive. | |
270 virtual bool obj_is_alive(const HeapWord* addr) const; | |
271 | |
272 // Allocation (return NULL if full). Assumes the caller has established | |
273 // mutually exclusive access to the space. | |
274 virtual HeapWord* allocate(size_t word_size) = 0; | |
275 | |
276 // Allocation (return NULL if full). Enforces mutual exclusion internally. | |
277 virtual HeapWord* par_allocate(size_t word_size) = 0; | |
278 | |
279 // Returns true if this object has been allocated since a | |
280 // generation's "save_marks" call. | |
281 virtual bool obj_allocated_since_save_marks(const oop obj) const = 0; | |
282 | |
283 // Mark-sweep-compact support: all spaces can update pointers to objects | |
284 // moving as a part of compaction. | |
285 virtual void adjust_pointers(); | |
286 | |
287 // PrintHeapAtGC support | |
288 virtual void print() const; | |
289 virtual void print_on(outputStream* st) const; | |
290 virtual void print_short() const; | |
291 virtual void print_short_on(outputStream* st) const; | |
292 | |
293 | |
294 // Accessor for parallel sequential tasks. | |
295 SequentialSubTasksDone* par_seq_tasks() { return &_par_seq_tasks; } | |
296 | |
297 // IF "this" is a ContiguousSpace, return it, else return NULL. | |
298 virtual ContiguousSpace* toContiguousSpace() { | |
299 return NULL; | |
300 } | |
301 | |
302 // Debugging | |
6008 | 303 virtual void verify() const = 0; |
0 | 304 }; |
305 | |
306 // A MemRegionClosure (ResourceObj) whose "do_MemRegion" function applies an | |
307 // OopClosure to (the addresses of) all the ref-containing fields that could | |
308 // be modified by virtue of the given MemRegion being dirty. (Note that | |
309 // because of the imprecise nature of the write barrier, this may iterate | |
310 // over oops beyond the region.) | |
311 // This base type for dirty card to oop closures handles memory regions | |
312 // in non-contiguous spaces with no boundaries, and should be sub-classed | |
313 // to support other space types. See ContiguousDCTOC for a sub-class | |
314 // that works with ContiguousSpaces. | |
315 | |
316 class DirtyCardToOopClosure: public MemRegionClosureRO { | |
317 protected: | |
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318 ExtendedOopClosure* _cl; |
0 | 319 Space* _sp; |
320 CardTableModRefBS::PrecisionStyle _precision; | |
321 HeapWord* _boundary; // If non-NULL, process only non-NULL oops | |
322 // pointing below boundary. | |
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323 HeapWord* _min_done; // ObjHeadPreciseArray precision requires |
0 | 324 // a downwards traversal; this is the |
325 // lowest location already done (or, | |
326 // alternatively, the lowest address that | |
327 // shouldn't be done again. NULL means infinity.) | |
328 NOT_PRODUCT(HeapWord* _last_bottom;) | |
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329 NOT_PRODUCT(HeapWord* _last_explicit_min_done;) |
0 | 330 |
331 // Get the actual top of the area on which the closure will | |
332 // operate, given where the top is assumed to be (the end of the | |
333 // memory region passed to do_MemRegion) and where the object | |
334 // at the top is assumed to start. For example, an object may | |
335 // start at the top but actually extend past the assumed top, | |
336 // in which case the top becomes the end of the object. | |
337 virtual HeapWord* get_actual_top(HeapWord* top, HeapWord* top_obj); | |
338 | |
339 // Walk the given memory region from bottom to (actual) top | |
340 // looking for objects and applying the oop closure (_cl) to | |
341 // them. The base implementation of this treats the area as | |
342 // blocks, where a block may or may not be an object. Sub- | |
343 // classes should override this to provide more accurate | |
344 // or possibly more efficient walking. | |
345 virtual void walk_mem_region(MemRegion mr, HeapWord* bottom, HeapWord* top); | |
346 | |
347 public: | |
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348 DirtyCardToOopClosure(Space* sp, ExtendedOopClosure* cl, |
0 | 349 CardTableModRefBS::PrecisionStyle precision, |
350 HeapWord* boundary) : | |
351 _sp(sp), _cl(cl), _precision(precision), _boundary(boundary), | |
352 _min_done(NULL) { | |
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353 NOT_PRODUCT(_last_bottom = NULL); |
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354 NOT_PRODUCT(_last_explicit_min_done = NULL); |
0 | 355 } |
356 | |
357 void do_MemRegion(MemRegion mr); | |
358 | |
359 void set_min_done(HeapWord* min_done) { | |
360 _min_done = min_done; | |
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361 NOT_PRODUCT(_last_explicit_min_done = _min_done); |
0 | 362 } |
363 #ifndef PRODUCT | |
364 void set_last_bottom(HeapWord* last_bottom) { | |
365 _last_bottom = last_bottom; | |
366 } | |
367 #endif | |
368 }; | |
369 | |
370 // A structure to represent a point at which objects are being copied | |
371 // during compaction. | |
372 class CompactPoint : public StackObj { | |
373 public: | |
374 Generation* gen; | |
375 CompactibleSpace* space; | |
376 HeapWord* threshold; | |
377 CompactPoint(Generation* _gen, CompactibleSpace* _space, | |
378 HeapWord* _threshold) : | |
379 gen(_gen), space(_space), threshold(_threshold) {} | |
380 }; | |
381 | |
382 | |
383 // A space that supports compaction operations. This is usually, but not | |
384 // necessarily, a space that is normally contiguous. But, for example, a | |
385 // free-list-based space whose normal collection is a mark-sweep without | |
386 // compaction could still support compaction in full GC's. | |
387 | |
388 class CompactibleSpace: public Space { | |
389 friend class VMStructs; | |
390 friend class CompactibleFreeListSpace; | |
391 private: | |
392 HeapWord* _compaction_top; | |
393 CompactibleSpace* _next_compaction_space; | |
394 | |
395 public: | |
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396 CompactibleSpace() : |
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397 _compaction_top(NULL), _next_compaction_space(NULL) {} |
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398 |
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399 virtual void initialize(MemRegion mr, bool clear_space, bool mangle_space); |
356 | 400 virtual void clear(bool mangle_space); |
0 | 401 |
402 // Used temporarily during a compaction phase to hold the value | |
403 // top should have when compaction is complete. | |
404 HeapWord* compaction_top() const { return _compaction_top; } | |
405 | |
406 void set_compaction_top(HeapWord* value) { | |
407 assert(value == NULL || (value >= bottom() && value <= end()), | |
408 "should point inside space"); | |
409 _compaction_top = value; | |
410 } | |
411 | |
412 // Perform operations on the space needed after a compaction | |
413 // has been performed. | |
414 virtual void reset_after_compaction() {} | |
415 | |
416 // Returns the next space (in the current generation) to be compacted in | |
417 // the global compaction order. Also is used to select the next | |
418 // space into which to compact. | |
419 | |
420 virtual CompactibleSpace* next_compaction_space() const { | |
421 return _next_compaction_space; | |
422 } | |
423 | |
424 void set_next_compaction_space(CompactibleSpace* csp) { | |
425 _next_compaction_space = csp; | |
426 } | |
427 | |
428 // MarkSweep support phase2 | |
429 | |
430 // Start the process of compaction of the current space: compute | |
431 // post-compaction addresses, and insert forwarding pointers. The fields | |
432 // "cp->gen" and "cp->compaction_space" are the generation and space into | |
433 // which we are currently compacting. This call updates "cp" as necessary, | |
434 // and leaves the "compaction_top" of the final value of | |
435 // "cp->compaction_space" up-to-date. Offset tables may be updated in | |
436 // this phase as if the final copy had occurred; if so, "cp->threshold" | |
437 // indicates when the next such action should be taken. | |
438 virtual void prepare_for_compaction(CompactPoint* cp); | |
439 // MarkSweep support phase3 | |
440 virtual void adjust_pointers(); | |
441 // MarkSweep support phase4 | |
442 virtual void compact(); | |
443 | |
444 // The maximum percentage of objects that can be dead in the compacted | |
445 // live part of a compacted space ("deadwood" support.) | |
438 | 446 virtual size_t allowed_dead_ratio() const { return 0; }; |
0 | 447 |
448 // Some contiguous spaces may maintain some data structures that should | |
449 // be updated whenever an allocation crosses a boundary. This function | |
450 // returns the first such boundary. | |
451 // (The default implementation returns the end of the space, so the | |
452 // boundary is never crossed.) | |
453 virtual HeapWord* initialize_threshold() { return end(); } | |
454 | |
455 // "q" is an object of the given "size" that should be forwarded; | |
456 // "cp" names the generation ("gen") and containing "this" (which must | |
457 // also equal "cp->space"). "compact_top" is where in "this" the | |
458 // next object should be forwarded to. If there is room in "this" for | |
459 // the object, insert an appropriate forwarding pointer in "q". | |
460 // If not, go to the next compaction space (there must | |
461 // be one, since compaction must succeed -- we go to the first space of | |
462 // the previous generation if necessary, updating "cp"), reset compact_top | |
463 // and then forward. In either case, returns the new value of "compact_top". | |
464 // If the forwarding crosses "cp->threshold", invokes the "cross_threhold" | |
465 // function of the then-current compaction space, and updates "cp->threshold | |
466 // accordingly". | |
467 virtual HeapWord* forward(oop q, size_t size, CompactPoint* cp, | |
468 HeapWord* compact_top); | |
469 | |
470 // Return a size with adjusments as required of the space. | |
471 virtual size_t adjust_object_size_v(size_t size) const { return size; } | |
472 | |
473 protected: | |
474 // Used during compaction. | |
475 HeapWord* _first_dead; | |
476 HeapWord* _end_of_live; | |
477 | |
478 // Minimum size of a free block. | |
479 virtual size_t minimum_free_block_size() const = 0; | |
480 | |
481 // This the function is invoked when an allocation of an object covering | |
482 // "start" to "end occurs crosses the threshold; returns the next | |
483 // threshold. (The default implementation does nothing.) | |
484 virtual HeapWord* cross_threshold(HeapWord* start, HeapWord* the_end) { | |
485 return end(); | |
486 } | |
487 | |
488 // Requires "allowed_deadspace_words > 0", that "q" is the start of a | |
489 // free block of the given "word_len", and that "q", were it an object, | |
490 // would not move if forwared. If the size allows, fill the free | |
491 // block with an object, to prevent excessive compaction. Returns "true" | |
492 // iff the free region was made deadspace, and modifies | |
493 // "allowed_deadspace_words" to reflect the number of available deadspace | |
494 // words remaining after this operation. | |
495 bool insert_deadspace(size_t& allowed_deadspace_words, HeapWord* q, | |
496 size_t word_len); | |
497 }; | |
498 | |
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499 class GenSpaceMangler; |
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500 |
0 | 501 // A space in which the free area is contiguous. It therefore supports |
502 // faster allocation, and compaction. | |
503 class ContiguousSpace: public CompactibleSpace { | |
504 friend class OneContigSpaceCardGeneration; | |
505 friend class VMStructs; | |
506 protected: | |
507 HeapWord* _top; | |
508 HeapWord* _concurrent_iteration_safe_limit; | |
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509 // A helper for mangling the unused area of the space in debug builds. |
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510 GenSpaceMangler* _mangler; |
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511 |
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512 GenSpaceMangler* mangler() { return _mangler; } |
0 | 513 |
514 // Allocation helpers (return NULL if full). | |
515 inline HeapWord* allocate_impl(size_t word_size, HeapWord* end_value); | |
516 inline HeapWord* par_allocate_impl(size_t word_size, HeapWord* end_value); | |
517 | |
518 public: | |
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519 ContiguousSpace(); |
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520 ~ContiguousSpace(); |
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521 |
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522 virtual void initialize(MemRegion mr, bool clear_space, bool mangle_space); |
356 | 523 virtual void clear(bool mangle_space); |
0 | 524 |
525 // Accessors | |
526 HeapWord* top() const { return _top; } | |
527 void set_top(HeapWord* value) { _top = value; } | |
528 | |
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529 virtual void set_saved_mark() { _saved_mark_word = top(); } |
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530 void reset_saved_mark() { _saved_mark_word = bottom(); } |
0 | 531 |
532 WaterMark bottom_mark() { return WaterMark(this, bottom()); } | |
533 WaterMark top_mark() { return WaterMark(this, top()); } | |
534 WaterMark saved_mark() { return WaterMark(this, saved_mark_word()); } | |
535 bool saved_mark_at_top() const { return saved_mark_word() == top(); } | |
536 | |
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537 // In debug mode mangle (write it with a particular bit |
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538 // pattern) the unused part of a space. |
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539 |
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540 // Used to save the an address in a space for later use during mangling. |
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541 void set_top_for_allocations(HeapWord* v) PRODUCT_RETURN; |
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542 // Used to save the space's current top for later use during mangling. |
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543 void set_top_for_allocations() PRODUCT_RETURN; |
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544 |
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545 // Mangle regions in the space from the current top up to the |
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546 // previously mangled part of the space. |
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547 void mangle_unused_area() PRODUCT_RETURN; |
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548 // Mangle [top, end) |
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549 void mangle_unused_area_complete() PRODUCT_RETURN; |
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550 // Mangle the given MemRegion. |
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551 void mangle_region(MemRegion mr) PRODUCT_RETURN; |
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552 |
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553 // Do some sparse checking on the area that should have been mangled. |
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554 void check_mangled_unused_area(HeapWord* limit) PRODUCT_RETURN; |
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555 // Check the complete area that should have been mangled. |
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556 // This code may be NULL depending on the macro DEBUG_MANGLING. |
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557 void check_mangled_unused_area_complete() PRODUCT_RETURN; |
0 | 558 |
559 // Size computations: sizes in bytes. | |
560 size_t capacity() const { return byte_size(bottom(), end()); } | |
561 size_t used() const { return byte_size(bottom(), top()); } | |
562 size_t free() const { return byte_size(top(), end()); } | |
563 | |
564 // Override from space. | |
565 bool is_in(const void* p) const; | |
566 | |
567 virtual bool is_free_block(const HeapWord* p) const; | |
568 | |
569 // In a contiguous space we have a more obvious bound on what parts | |
570 // contain objects. | |
571 MemRegion used_region() const { return MemRegion(bottom(), top()); } | |
572 | |
573 MemRegion used_region_at_save_marks() const { | |
574 return MemRegion(bottom(), saved_mark_word()); | |
575 } | |
576 | |
577 // Allocation (return NULL if full) | |
578 virtual HeapWord* allocate(size_t word_size); | |
579 virtual HeapWord* par_allocate(size_t word_size); | |
580 | |
581 virtual bool obj_allocated_since_save_marks(const oop obj) const { | |
582 return (HeapWord*)obj >= saved_mark_word(); | |
583 } | |
584 | |
585 // Iteration | |
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586 void oop_iterate(ExtendedOopClosure* cl); |
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587 void oop_iterate(MemRegion mr, ExtendedOopClosure* cl); |
0 | 588 void object_iterate(ObjectClosure* blk); |
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589 // For contiguous spaces this method will iterate safely over objects |
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590 // in the space (i.e., between bottom and top) when at a safepoint. |
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591 void safe_object_iterate(ObjectClosure* blk); |
0 | 592 void object_iterate_mem(MemRegion mr, UpwardsObjectClosure* cl); |
593 // iterates on objects up to the safe limit | |
594 HeapWord* object_iterate_careful(ObjectClosureCareful* cl); | |
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595 HeapWord* concurrent_iteration_safe_limit() { |
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596 assert(_concurrent_iteration_safe_limit <= top(), |
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597 "_concurrent_iteration_safe_limit update missed"); |
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598 return _concurrent_iteration_safe_limit; |
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599 } |
0 | 600 // changes the safe limit, all objects from bottom() to the new |
601 // limit should be properly initialized | |
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602 void set_concurrent_iteration_safe_limit(HeapWord* new_limit) { |
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603 assert(new_limit <= top(), "uninitialized objects in the safe range"); |
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604 _concurrent_iteration_safe_limit = new_limit; |
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605 } |
0 | 606 |
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607 |
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608 #if INCLUDE_ALL_GCS |
0 | 609 // In support of parallel oop_iterate. |
610 #define ContigSpace_PAR_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ | |
611 void par_oop_iterate(MemRegion mr, OopClosureType* blk); | |
612 | |
613 ALL_PAR_OOP_ITERATE_CLOSURES(ContigSpace_PAR_OOP_ITERATE_DECL) | |
614 #undef ContigSpace_PAR_OOP_ITERATE_DECL | |
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615 #endif // INCLUDE_ALL_GCS |
0 | 616 |
617 // Compaction support | |
618 virtual void reset_after_compaction() { | |
619 assert(compaction_top() >= bottom() && compaction_top() <= end(), "should point inside space"); | |
620 set_top(compaction_top()); | |
621 // set new iteration safe limit | |
622 set_concurrent_iteration_safe_limit(compaction_top()); | |
623 } | |
624 virtual size_t minimum_free_block_size() const { return 0; } | |
625 | |
626 // Override. | |
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627 DirtyCardToOopClosure* new_dcto_cl(ExtendedOopClosure* cl, |
0 | 628 CardTableModRefBS::PrecisionStyle precision, |
629 HeapWord* boundary = NULL); | |
630 | |
631 // Apply "blk->do_oop" to the addresses of all reference fields in objects | |
632 // starting with the _saved_mark_word, which was noted during a generation's | |
633 // save_marks and is required to denote the head of an object. | |
634 // Fields in objects allocated by applications of the closure | |
635 // *are* included in the iteration. | |
636 // Updates _saved_mark_word to point to just after the last object | |
637 // iterated over. | |
638 #define ContigSpace_OOP_SINCE_SAVE_MARKS_DECL(OopClosureType, nv_suffix) \ | |
639 void oop_since_save_marks_iterate##nv_suffix(OopClosureType* blk); | |
640 | |
641 ALL_SINCE_SAVE_MARKS_CLOSURES(ContigSpace_OOP_SINCE_SAVE_MARKS_DECL) | |
642 #undef ContigSpace_OOP_SINCE_SAVE_MARKS_DECL | |
643 | |
644 // Same as object_iterate, but starting from "mark", which is required | |
645 // to denote the start of an object. Objects allocated by | |
646 // applications of the closure *are* included in the iteration. | |
647 virtual void object_iterate_from(WaterMark mark, ObjectClosure* blk); | |
648 | |
649 // Very inefficient implementation. | |
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650 virtual HeapWord* block_start_const(const void* p) const; |
0 | 651 size_t block_size(const HeapWord* p) const; |
652 // If a block is in the allocated area, it is an object. | |
653 bool block_is_obj(const HeapWord* p) const { return p < top(); } | |
654 | |
655 // Addresses for inlined allocation | |
656 HeapWord** top_addr() { return &_top; } | |
657 HeapWord** end_addr() { return &_end; } | |
658 | |
659 // Overrides for more efficient compaction support. | |
660 void prepare_for_compaction(CompactPoint* cp); | |
661 | |
662 // PrintHeapAtGC support. | |
663 virtual void print_on(outputStream* st) const; | |
664 | |
665 // Checked dynamic downcasts. | |
666 virtual ContiguousSpace* toContiguousSpace() { | |
667 return this; | |
668 } | |
669 | |
670 // Debugging | |
6008 | 671 virtual void verify() const; |
0 | 672 |
673 // Used to increase collection frequency. "factor" of 0 means entire | |
674 // space. | |
675 void allocate_temporary_filler(int factor); | |
676 | |
677 }; | |
678 | |
679 | |
680 // A dirty card to oop closure that does filtering. | |
681 // It knows how to filter out objects that are outside of the _boundary. | |
682 class Filtering_DCTOC : public DirtyCardToOopClosure { | |
683 protected: | |
684 // Override. | |
685 void walk_mem_region(MemRegion mr, | |
686 HeapWord* bottom, HeapWord* top); | |
687 | |
688 // Walk the given memory region, from bottom to top, applying | |
689 // the given oop closure to (possibly) all objects found. The | |
690 // given oop closure may or may not be the same as the oop | |
691 // closure with which this closure was created, as it may | |
692 // be a filtering closure which makes use of the _boundary. | |
693 // We offer two signatures, so the FilteringClosure static type is | |
694 // apparent. | |
695 virtual void walk_mem_region_with_cl(MemRegion mr, | |
696 HeapWord* bottom, HeapWord* top, | |
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697 ExtendedOopClosure* cl) = 0; |
0 | 698 virtual void walk_mem_region_with_cl(MemRegion mr, |
699 HeapWord* bottom, HeapWord* top, | |
700 FilteringClosure* cl) = 0; | |
701 | |
702 public: | |
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703 Filtering_DCTOC(Space* sp, ExtendedOopClosure* cl, |
0 | 704 CardTableModRefBS::PrecisionStyle precision, |
705 HeapWord* boundary) : | |
706 DirtyCardToOopClosure(sp, cl, precision, boundary) {} | |
707 }; | |
708 | |
709 // A dirty card to oop closure for contiguous spaces | |
710 // (ContiguousSpace and sub-classes). | |
711 // It is a FilteringClosure, as defined above, and it knows: | |
712 // | |
713 // 1. That the actual top of any area in a memory region | |
714 // contained by the space is bounded by the end of the contiguous | |
715 // region of the space. | |
716 // 2. That the space is really made up of objects and not just | |
717 // blocks. | |
718 | |
719 class ContiguousSpaceDCTOC : public Filtering_DCTOC { | |
720 protected: | |
721 // Overrides. | |
722 HeapWord* get_actual_top(HeapWord* top, HeapWord* top_obj); | |
723 | |
724 virtual void walk_mem_region_with_cl(MemRegion mr, | |
725 HeapWord* bottom, HeapWord* top, | |
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726 ExtendedOopClosure* cl); |
0 | 727 virtual void walk_mem_region_with_cl(MemRegion mr, |
728 HeapWord* bottom, HeapWord* top, | |
729 FilteringClosure* cl); | |
730 | |
731 public: | |
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732 ContiguousSpaceDCTOC(ContiguousSpace* sp, ExtendedOopClosure* cl, |
0 | 733 CardTableModRefBS::PrecisionStyle precision, |
734 HeapWord* boundary) : | |
735 Filtering_DCTOC(sp, cl, precision, boundary) | |
736 {} | |
737 }; | |
738 | |
739 | |
740 // Class EdenSpace describes eden-space in new generation. | |
741 | |
742 class DefNewGeneration; | |
743 | |
744 class EdenSpace : public ContiguousSpace { | |
745 friend class VMStructs; | |
746 private: | |
747 DefNewGeneration* _gen; | |
748 | |
749 // _soft_end is used as a soft limit on allocation. As soft limits are | |
750 // reached, the slow-path allocation code can invoke other actions and then | |
751 // adjust _soft_end up to a new soft limit or to end(). | |
752 HeapWord* _soft_end; | |
753 | |
754 public: | |
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755 EdenSpace(DefNewGeneration* gen) : |
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756 _gen(gen), _soft_end(NULL) {} |
0 | 757 |
758 // Get/set just the 'soft' limit. | |
759 HeapWord* soft_end() { return _soft_end; } | |
760 HeapWord** soft_end_addr() { return &_soft_end; } | |
761 void set_soft_end(HeapWord* value) { _soft_end = value; } | |
762 | |
763 // Override. | |
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764 void clear(bool mangle_space); |
0 | 765 |
766 // Set both the 'hard' and 'soft' limits (_end and _soft_end). | |
767 void set_end(HeapWord* value) { | |
768 set_soft_end(value); | |
769 ContiguousSpace::set_end(value); | |
770 } | |
771 | |
772 // Allocation (return NULL if full) | |
773 HeapWord* allocate(size_t word_size); | |
774 HeapWord* par_allocate(size_t word_size); | |
775 }; | |
776 | |
777 // Class ConcEdenSpace extends EdenSpace for the sake of safe | |
778 // allocation while soft-end is being modified concurrently | |
779 | |
780 class ConcEdenSpace : public EdenSpace { | |
781 public: | |
782 ConcEdenSpace(DefNewGeneration* gen) : EdenSpace(gen) { } | |
783 | |
784 // Allocation (return NULL if full) | |
785 HeapWord* par_allocate(size_t word_size); | |
786 }; | |
787 | |
788 | |
789 // A ContigSpace that Supports an efficient "block_start" operation via | |
790 // a BlockOffsetArray (whose BlockOffsetSharedArray may be shared with | |
791 // other spaces.) This is the abstract base class for old generation | |
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792 // (tenured) spaces. |
0 | 793 |
794 class OffsetTableContigSpace: public ContiguousSpace { | |
795 friend class VMStructs; | |
796 protected: | |
797 BlockOffsetArrayContigSpace _offsets; | |
798 Mutex _par_alloc_lock; | |
799 | |
800 public: | |
801 // Constructor | |
802 OffsetTableContigSpace(BlockOffsetSharedArray* sharedOffsetArray, | |
803 MemRegion mr); | |
804 | |
805 void set_bottom(HeapWord* value); | |
806 void set_end(HeapWord* value); | |
807 | |
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808 void clear(bool mangle_space); |
0 | 809 |
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810 inline HeapWord* block_start_const(const void* p) const; |
0 | 811 |
812 // Add offset table update. | |
813 virtual inline HeapWord* allocate(size_t word_size); | |
814 inline HeapWord* par_allocate(size_t word_size); | |
815 | |
816 // MarkSweep support phase3 | |
817 virtual HeapWord* initialize_threshold(); | |
818 virtual HeapWord* cross_threshold(HeapWord* start, HeapWord* end); | |
819 | |
820 virtual void print_on(outputStream* st) const; | |
821 | |
822 // Debugging | |
6008 | 823 void verify() const; |
0 | 824 }; |
825 | |
826 | |
827 // Class TenuredSpace is used by TenuredGeneration | |
828 | |
829 class TenuredSpace: public OffsetTableContigSpace { | |
830 friend class VMStructs; | |
831 protected: | |
832 // Mark sweep support | |
438 | 833 size_t allowed_dead_ratio() const; |
0 | 834 public: |
835 // Constructor | |
836 TenuredSpace(BlockOffsetSharedArray* sharedOffsetArray, | |
837 MemRegion mr) : | |
838 OffsetTableContigSpace(sharedOffsetArray, mr) {} | |
839 }; | |
1972 | 840 #endif // SHARE_VM_MEMORY_SPACE_HPP |