Mercurial > hg > graal-jvmci-8
annotate src/share/vm/memory/space.hpp @ 20264:30c99d8e0f02
8038399: Remove dead oop_iterate MemRegion variants from SharedHeap, Generation and Space classes
Reviewed-by: tschatzl, stefank
| author | mgerdin |
|---|---|
| date | Thu, 06 Mar 2014 09:08:18 +0100 |
| parents | c49dcaf78a65 |
| children | 5255b195f828 |
| rev | line source |
|---|---|
| 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 // A Space describes a heap area. Class Space is an abstract | |
| 69 // base class. | |
| 70 // | |
| 71 // Space supports allocation, size computation and GC support is provided. | |
| 72 // | |
| 73 // Invariant: bottom() and end() are on page_size boundaries and | |
| 74 // bottom() <= top() <= end() | |
| 75 // top() is inclusive and end() is exclusive. | |
| 76 | |
| 6197 | 77 class Space: public CHeapObj<mtGC> { |
| 0 | 78 friend class VMStructs; |
| 79 protected: | |
| 80 HeapWord* _bottom; | |
| 81 HeapWord* _end; | |
| 82 | |
| 83 // Used in support of save_marks() | |
| 84 HeapWord* _saved_mark_word; | |
| 85 | |
| 86 MemRegionClosure* _preconsumptionDirtyCardClosure; | |
| 87 | |
| 88 // A sequential tasks done structure. This supports | |
| 89 // parallel GC, where we have threads dynamically | |
| 90 // claiming sub-tasks from a larger parallel task. | |
| 91 SequentialSubTasksDone _par_seq_tasks; | |
| 92 | |
| 93 Space(): | |
| 94 _bottom(NULL), _end(NULL), _preconsumptionDirtyCardClosure(NULL) { } | |
| 95 | |
| 96 public: | |
| 97 // Accessors | |
| 98 HeapWord* bottom() const { return _bottom; } | |
| 99 HeapWord* end() const { return _end; } | |
| 100 virtual void set_bottom(HeapWord* value) { _bottom = value; } | |
| 101 virtual void set_end(HeapWord* value) { _end = value; } | |
| 102 | |
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103 virtual HeapWord* saved_mark_word() const { return _saved_mark_word; } |
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104 |
| 0 | 105 void set_saved_mark_word(HeapWord* p) { _saved_mark_word = p; } |
| 106 | |
| 107 MemRegionClosure* preconsumptionDirtyCardClosure() const { | |
| 108 return _preconsumptionDirtyCardClosure; | |
| 109 } | |
| 110 void setPreconsumptionDirtyCardClosure(MemRegionClosure* cl) { | |
| 111 _preconsumptionDirtyCardClosure = cl; | |
| 112 } | |
| 113 | |
| 114 // Returns a subregion of the space containing all the objects in | |
| 115 // the space. | |
| 116 virtual MemRegion used_region() const { return MemRegion(bottom(), end()); } | |
| 117 | |
| 118 // Returns a region that is guaranteed to contain (at least) all objects | |
| 119 // allocated at the time of the last call to "save_marks". If the space | |
| 120 // initializes its DirtyCardToOopClosure's specifying the "contig" option | |
| 121 // (that is, if the space is contiguous), then this region must contain only | |
| 122 // such objects: the memregion will be from the bottom of the region to the | |
| 123 // saved mark. Otherwise, the "obj_allocated_since_save_marks" method of | |
| 124 // the space must distiguish between objects in the region allocated before | |
| 125 // and after the call to save marks. | |
| 126 virtual MemRegion used_region_at_save_marks() const { | |
| 127 return MemRegion(bottom(), saved_mark_word()); | |
| 128 } | |
| 129 | |
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130 // Initialization. |
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131 // "initialize" should be called once on a space, before it is used for |
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132 // any purpose. The "mr" arguments gives the bounds of the space, and |
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133 // the "clear_space" argument should be true unless the memory in "mr" is |
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134 // known to be zeroed. |
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135 virtual void initialize(MemRegion mr, bool clear_space, bool mangle_space); |
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136 |
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137 // The "clear" method must be called on a region that may have |
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138 // had allocation performed in it, but is now to be considered empty. |
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139 virtual void clear(bool mangle_space); |
| 0 | 140 |
| 141 // For detecting GC bugs. Should only be called at GC boundaries, since | |
| 142 // some unused space may be used as scratch space during GC's. | |
| 143 // Default implementation does nothing. We also call this when expanding | |
| 144 // a space to satisfy an allocation request. See bug #4668531 | |
| 145 virtual void mangle_unused_area() {} | |
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146 virtual void mangle_unused_area_complete() {} |
| 0 | 147 virtual void mangle_region(MemRegion mr) {} |
| 148 | |
| 149 // Testers | |
| 150 bool is_empty() const { return used() == 0; } | |
| 151 bool not_empty() const { return used() > 0; } | |
| 152 | |
| 153 // Returns true iff the given the space contains the | |
| 154 // given address as part of an allocated object. For | |
| 155 // ceratin kinds of spaces, this might be a potentially | |
| 156 // expensive operation. To prevent performance problems | |
| 157 // on account of its inadvertent use in product jvm's, | |
| 158 // we restrict its use to assertion checks only. | |
| 4708 | 159 virtual bool is_in(const void* p) const = 0; |
| 0 | 160 |
| 161 // Returns true iff the given reserved memory of the space contains the | |
| 162 // given address. | |
| 163 bool is_in_reserved(const void* p) const { return _bottom <= p && p < _end; } | |
| 164 | |
| 165 // Returns true iff the given block is not allocated. | |
| 166 virtual bool is_free_block(const HeapWord* p) const = 0; | |
| 167 | |
| 168 // Test whether p is double-aligned | |
| 169 static bool is_aligned(void* p) { | |
| 170 return ((intptr_t)p & (sizeof(double)-1)) == 0; | |
| 171 } | |
| 172 | |
| 173 // Size computations. Sizes are in bytes. | |
| 174 size_t capacity() const { return byte_size(bottom(), end()); } | |
| 175 virtual size_t used() const = 0; | |
| 176 virtual size_t free() const = 0; | |
| 177 | |
| 178 // Iterate over all the ref-containing fields of all objects in the | |
| 179 // space, calling "cl.do_oop" on each. Fields in objects allocated by | |
| 180 // applications of the closure are not included in the iteration. | |
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181 virtual void oop_iterate(ExtendedOopClosure* cl); |
| 0 | 182 |
| 183 // Iterate over all objects in the space, calling "cl.do_object" on | |
| 184 // each. Objects allocated by applications of the closure are not | |
| 185 // included in the iteration. | |
| 186 virtual void object_iterate(ObjectClosure* blk) = 0; | |
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187 // Similar to object_iterate() except only iterates over |
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188 // objects whose internal references point to objects in the space. |
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189 virtual void safe_object_iterate(ObjectClosure* blk) = 0; |
| 0 | 190 |
| 191 // Iterate over all objects that intersect with mr, calling "cl->do_object" | |
| 192 // on each. There is an exception to this: if this closure has already | |
| 193 // been invoked on an object, it may skip such objects in some cases. This is | |
| 194 // Most likely to happen in an "upwards" (ascending address) iteration of | |
| 195 // MemRegions. | |
| 196 virtual void object_iterate_mem(MemRegion mr, UpwardsObjectClosure* cl); | |
| 197 | |
| 198 // Iterate over as many initialized objects in the space as possible, | |
| 199 // calling "cl.do_object_careful" on each. Return NULL if all objects | |
| 200 // in the space (at the start of the iteration) were iterated over. | |
| 201 // Return an address indicating the extent of the iteration in the | |
| 202 // event that the iteration had to return because of finding an | |
| 203 // uninitialized object in the space, or if the closure "cl" | |
| 204 // signalled early termination. | |
| 205 virtual HeapWord* object_iterate_careful(ObjectClosureCareful* cl); | |
| 206 virtual HeapWord* object_iterate_careful_m(MemRegion mr, | |
| 207 ObjectClosureCareful* cl); | |
| 208 | |
| 209 // Create and return a new dirty card to oop closure. Can be | |
| 210 // overriden to return the appropriate type of closure | |
| 211 // depending on the type of space in which the closure will | |
| 212 // operate. ResourceArea allocated. | |
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213 virtual DirtyCardToOopClosure* new_dcto_cl(ExtendedOopClosure* cl, |
| 0 | 214 CardTableModRefBS::PrecisionStyle precision, |
| 215 HeapWord* boundary = NULL); | |
| 216 | |
| 217 // If "p" is in the space, returns the address of the start of the | |
| 218 // "block" that contains "p". We say "block" instead of "object" since | |
| 219 // some heaps may not pack objects densely; a chunk may either be an | |
| 220 // object or a non-object. If "p" is not in the space, return NULL. | |
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221 virtual HeapWord* block_start_const(const void* p) const = 0; |
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222 |
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223 // The non-const version may have benevolent side effects on the data |
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224 // structure supporting these calls, possibly speeding up future calls. |
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225 // The default implementation, however, is simply to call the const |
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226 // version. |
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227 inline virtual HeapWord* block_start(const void* p); |
| 0 | 228 |
| 229 // Requires "addr" to be the start of a chunk, and returns its size. | |
| 230 // "addr + size" is required to be the start of a new chunk, or the end | |
| 231 // of the active area of the heap. | |
| 232 virtual size_t block_size(const HeapWord* addr) const = 0; | |
| 233 | |
| 234 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
| 235 // the block is an object. | |
| 236 virtual bool block_is_obj(const HeapWord* addr) const = 0; | |
| 237 | |
| 238 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
| 239 // the block is an object and the object is alive. | |
| 240 virtual bool obj_is_alive(const HeapWord* addr) const; | |
| 241 | |
| 242 // Allocation (return NULL if full). Assumes the caller has established | |
| 243 // mutually exclusive access to the space. | |
| 244 virtual HeapWord* allocate(size_t word_size) = 0; | |
| 245 | |
| 246 // Allocation (return NULL if full). Enforces mutual exclusion internally. | |
| 247 virtual HeapWord* par_allocate(size_t word_size) = 0; | |
| 248 | |
| 249 // Returns true if this object has been allocated since a | |
| 250 // generation's "save_marks" call. | |
| 251 virtual bool obj_allocated_since_save_marks(const oop obj) const = 0; | |
| 252 | |
| 253 // Mark-sweep-compact support: all spaces can update pointers to objects | |
| 254 // moving as a part of compaction. | |
| 255 virtual void adjust_pointers(); | |
| 256 | |
| 257 // PrintHeapAtGC support | |
| 258 virtual void print() const; | |
| 259 virtual void print_on(outputStream* st) const; | |
| 260 virtual void print_short() const; | |
| 261 virtual void print_short_on(outputStream* st) const; | |
| 262 | |
| 263 | |
| 264 // Accessor for parallel sequential tasks. | |
| 265 SequentialSubTasksDone* par_seq_tasks() { return &_par_seq_tasks; } | |
| 266 | |
| 267 // IF "this" is a ContiguousSpace, return it, else return NULL. | |
| 268 virtual ContiguousSpace* toContiguousSpace() { | |
| 269 return NULL; | |
| 270 } | |
| 271 | |
| 272 // Debugging | |
| 6008 | 273 virtual void verify() const = 0; |
| 0 | 274 }; |
| 275 | |
| 276 // A MemRegionClosure (ResourceObj) whose "do_MemRegion" function applies an | |
| 277 // OopClosure to (the addresses of) all the ref-containing fields that could | |
| 278 // be modified by virtue of the given MemRegion being dirty. (Note that | |
| 279 // because of the imprecise nature of the write barrier, this may iterate | |
| 280 // over oops beyond the region.) | |
| 281 // This base type for dirty card to oop closures handles memory regions | |
| 282 // in non-contiguous spaces with no boundaries, and should be sub-classed | |
| 283 // to support other space types. See ContiguousDCTOC for a sub-class | |
| 284 // that works with ContiguousSpaces. | |
| 285 | |
| 286 class DirtyCardToOopClosure: public MemRegionClosureRO { | |
| 287 protected: | |
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288 ExtendedOopClosure* _cl; |
| 0 | 289 Space* _sp; |
| 290 CardTableModRefBS::PrecisionStyle _precision; | |
| 291 HeapWord* _boundary; // If non-NULL, process only non-NULL oops | |
| 292 // pointing below boundary. | |
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293 HeapWord* _min_done; // ObjHeadPreciseArray precision requires |
| 0 | 294 // a downwards traversal; this is the |
| 295 // lowest location already done (or, | |
| 296 // alternatively, the lowest address that | |
| 297 // shouldn't be done again. NULL means infinity.) | |
| 298 NOT_PRODUCT(HeapWord* _last_bottom;) | |
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299 NOT_PRODUCT(HeapWord* _last_explicit_min_done;) |
| 0 | 300 |
| 301 // Get the actual top of the area on which the closure will | |
| 302 // operate, given where the top is assumed to be (the end of the | |
| 303 // memory region passed to do_MemRegion) and where the object | |
| 304 // at the top is assumed to start. For example, an object may | |
| 305 // start at the top but actually extend past the assumed top, | |
| 306 // in which case the top becomes the end of the object. | |
| 307 virtual HeapWord* get_actual_top(HeapWord* top, HeapWord* top_obj); | |
| 308 | |
| 309 // Walk the given memory region from bottom to (actual) top | |
| 310 // looking for objects and applying the oop closure (_cl) to | |
| 311 // them. The base implementation of this treats the area as | |
| 312 // blocks, where a block may or may not be an object. Sub- | |
| 313 // classes should override this to provide more accurate | |
| 314 // or possibly more efficient walking. | |
| 315 virtual void walk_mem_region(MemRegion mr, HeapWord* bottom, HeapWord* top); | |
| 316 | |
| 317 public: | |
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318 DirtyCardToOopClosure(Space* sp, ExtendedOopClosure* cl, |
| 0 | 319 CardTableModRefBS::PrecisionStyle precision, |
| 320 HeapWord* boundary) : | |
| 321 _sp(sp), _cl(cl), _precision(precision), _boundary(boundary), | |
| 322 _min_done(NULL) { | |
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323 NOT_PRODUCT(_last_bottom = NULL); |
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324 NOT_PRODUCT(_last_explicit_min_done = NULL); |
| 0 | 325 } |
| 326 | |
| 327 void do_MemRegion(MemRegion mr); | |
| 328 | |
| 329 void set_min_done(HeapWord* min_done) { | |
| 330 _min_done = min_done; | |
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331 NOT_PRODUCT(_last_explicit_min_done = _min_done); |
| 0 | 332 } |
| 333 #ifndef PRODUCT | |
| 334 void set_last_bottom(HeapWord* last_bottom) { | |
| 335 _last_bottom = last_bottom; | |
| 336 } | |
| 337 #endif | |
| 338 }; | |
| 339 | |
| 340 // A structure to represent a point at which objects are being copied | |
| 341 // during compaction. | |
| 342 class CompactPoint : public StackObj { | |
| 343 public: | |
| 344 Generation* gen; | |
| 345 CompactibleSpace* space; | |
| 346 HeapWord* threshold; | |
| 347 CompactPoint(Generation* _gen, CompactibleSpace* _space, | |
| 348 HeapWord* _threshold) : | |
| 349 gen(_gen), space(_space), threshold(_threshold) {} | |
| 350 }; | |
| 351 | |
| 352 | |
| 353 // A space that supports compaction operations. This is usually, but not | |
| 354 // necessarily, a space that is normally contiguous. But, for example, a | |
| 355 // free-list-based space whose normal collection is a mark-sweep without | |
| 356 // compaction could still support compaction in full GC's. | |
| 357 | |
| 358 class CompactibleSpace: public Space { | |
| 359 friend class VMStructs; | |
| 360 friend class CompactibleFreeListSpace; | |
| 361 private: | |
| 362 HeapWord* _compaction_top; | |
| 363 CompactibleSpace* _next_compaction_space; | |
| 364 | |
| 365 public: | |
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366 CompactibleSpace() : |
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367 _compaction_top(NULL), _next_compaction_space(NULL) {} |
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368 |
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369 virtual void initialize(MemRegion mr, bool clear_space, bool mangle_space); |
| 356 | 370 virtual void clear(bool mangle_space); |
| 0 | 371 |
| 372 // Used temporarily during a compaction phase to hold the value | |
| 373 // top should have when compaction is complete. | |
| 374 HeapWord* compaction_top() const { return _compaction_top; } | |
| 375 | |
| 376 void set_compaction_top(HeapWord* value) { | |
| 377 assert(value == NULL || (value >= bottom() && value <= end()), | |
| 378 "should point inside space"); | |
| 379 _compaction_top = value; | |
| 380 } | |
| 381 | |
| 382 // Perform operations on the space needed after a compaction | |
| 383 // has been performed. | |
| 384 virtual void reset_after_compaction() {} | |
| 385 | |
| 386 // Returns the next space (in the current generation) to be compacted in | |
| 387 // the global compaction order. Also is used to select the next | |
| 388 // space into which to compact. | |
| 389 | |
| 390 virtual CompactibleSpace* next_compaction_space() const { | |
| 391 return _next_compaction_space; | |
| 392 } | |
| 393 | |
| 394 void set_next_compaction_space(CompactibleSpace* csp) { | |
| 395 _next_compaction_space = csp; | |
| 396 } | |
| 397 | |
| 398 // MarkSweep support phase2 | |
| 399 | |
| 400 // Start the process of compaction of the current space: compute | |
| 401 // post-compaction addresses, and insert forwarding pointers. The fields | |
| 402 // "cp->gen" and "cp->compaction_space" are the generation and space into | |
| 403 // which we are currently compacting. This call updates "cp" as necessary, | |
| 404 // and leaves the "compaction_top" of the final value of | |
| 405 // "cp->compaction_space" up-to-date. Offset tables may be updated in | |
| 406 // this phase as if the final copy had occurred; if so, "cp->threshold" | |
| 407 // indicates when the next such action should be taken. | |
| 408 virtual void prepare_for_compaction(CompactPoint* cp); | |
| 409 // MarkSweep support phase3 | |
| 410 virtual void adjust_pointers(); | |
| 411 // MarkSweep support phase4 | |
| 412 virtual void compact(); | |
| 413 | |
| 414 // The maximum percentage of objects that can be dead in the compacted | |
| 415 // live part of a compacted space ("deadwood" support.) | |
| 438 | 416 virtual size_t allowed_dead_ratio() const { return 0; }; |
| 0 | 417 |
| 418 // Some contiguous spaces may maintain some data structures that should | |
| 419 // be updated whenever an allocation crosses a boundary. This function | |
| 420 // returns the first such boundary. | |
| 421 // (The default implementation returns the end of the space, so the | |
| 422 // boundary is never crossed.) | |
| 423 virtual HeapWord* initialize_threshold() { return end(); } | |
| 424 | |
| 425 // "q" is an object of the given "size" that should be forwarded; | |
| 426 // "cp" names the generation ("gen") and containing "this" (which must | |
| 427 // also equal "cp->space"). "compact_top" is where in "this" the | |
| 428 // next object should be forwarded to. If there is room in "this" for | |
| 429 // the object, insert an appropriate forwarding pointer in "q". | |
| 430 // If not, go to the next compaction space (there must | |
| 431 // be one, since compaction must succeed -- we go to the first space of | |
| 432 // the previous generation if necessary, updating "cp"), reset compact_top | |
| 433 // and then forward. In either case, returns the new value of "compact_top". | |
| 434 // If the forwarding crosses "cp->threshold", invokes the "cross_threhold" | |
| 435 // function of the then-current compaction space, and updates "cp->threshold | |
| 436 // accordingly". | |
| 437 virtual HeapWord* forward(oop q, size_t size, CompactPoint* cp, | |
| 438 HeapWord* compact_top); | |
| 439 | |
| 440 // Return a size with adjusments as required of the space. | |
| 441 virtual size_t adjust_object_size_v(size_t size) const { return size; } | |
| 442 | |
| 443 protected: | |
| 444 // Used during compaction. | |
| 445 HeapWord* _first_dead; | |
| 446 HeapWord* _end_of_live; | |
| 447 | |
| 448 // Minimum size of a free block. | |
| 449 virtual size_t minimum_free_block_size() const = 0; | |
| 450 | |
| 451 // This the function is invoked when an allocation of an object covering | |
| 452 // "start" to "end occurs crosses the threshold; returns the next | |
| 453 // threshold. (The default implementation does nothing.) | |
| 454 virtual HeapWord* cross_threshold(HeapWord* start, HeapWord* the_end) { | |
| 455 return end(); | |
| 456 } | |
| 457 | |
| 458 // Requires "allowed_deadspace_words > 0", that "q" is the start of a | |
| 459 // free block of the given "word_len", and that "q", were it an object, | |
| 460 // would not move if forwared. If the size allows, fill the free | |
| 461 // block with an object, to prevent excessive compaction. Returns "true" | |
| 462 // iff the free region was made deadspace, and modifies | |
| 463 // "allowed_deadspace_words" to reflect the number of available deadspace | |
| 464 // words remaining after this operation. | |
| 465 bool insert_deadspace(size_t& allowed_deadspace_words, HeapWord* q, | |
| 466 size_t word_len); | |
| 467 }; | |
| 468 | |
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469 class GenSpaceMangler; |
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470 |
| 0 | 471 // A space in which the free area is contiguous. It therefore supports |
| 472 // faster allocation, and compaction. | |
| 473 class ContiguousSpace: public CompactibleSpace { | |
| 474 friend class OneContigSpaceCardGeneration; | |
| 475 friend class VMStructs; | |
| 476 protected: | |
| 477 HeapWord* _top; | |
| 478 HeapWord* _concurrent_iteration_safe_limit; | |
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479 // A helper for mangling the unused area of the space in debug builds. |
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480 GenSpaceMangler* _mangler; |
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481 |
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482 GenSpaceMangler* mangler() { return _mangler; } |
| 0 | 483 |
| 484 // Allocation helpers (return NULL if full). | |
| 485 inline HeapWord* allocate_impl(size_t word_size, HeapWord* end_value); | |
| 486 inline HeapWord* par_allocate_impl(size_t word_size, HeapWord* end_value); | |
| 487 | |
| 488 public: | |
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489 ContiguousSpace(); |
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490 ~ContiguousSpace(); |
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491 |
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492 virtual void initialize(MemRegion mr, bool clear_space, bool mangle_space); |
| 356 | 493 virtual void clear(bool mangle_space); |
| 0 | 494 |
| 495 // Accessors | |
| 496 HeapWord* top() const { return _top; } | |
| 497 void set_top(HeapWord* value) { _top = value; } | |
| 498 | |
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499 virtual void set_saved_mark() { _saved_mark_word = top(); } |
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500 void reset_saved_mark() { _saved_mark_word = bottom(); } |
| 0 | 501 |
| 502 WaterMark bottom_mark() { return WaterMark(this, bottom()); } | |
| 503 WaterMark top_mark() { return WaterMark(this, top()); } | |
| 504 WaterMark saved_mark() { return WaterMark(this, saved_mark_word()); } | |
| 505 bool saved_mark_at_top() const { return saved_mark_word() == top(); } | |
| 506 | |
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507 // In debug mode mangle (write it with a particular bit |
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508 // pattern) the unused part of a space. |
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509 |
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510 // Used to save the an address in a space for later use during mangling. |
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511 void set_top_for_allocations(HeapWord* v) PRODUCT_RETURN; |
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512 // Used to save the space's current top for later use during mangling. |
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513 void set_top_for_allocations() PRODUCT_RETURN; |
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514 |
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515 // Mangle regions in the space from the current top up to the |
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516 // previously mangled part of the space. |
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517 void mangle_unused_area() PRODUCT_RETURN; |
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518 // Mangle [top, end) |
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519 void mangle_unused_area_complete() PRODUCT_RETURN; |
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520 // Mangle the given MemRegion. |
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521 void mangle_region(MemRegion mr) PRODUCT_RETURN; |
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522 |
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523 // Do some sparse checking on the area that should have been mangled. |
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524 void check_mangled_unused_area(HeapWord* limit) PRODUCT_RETURN; |
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525 // Check the complete area that should have been mangled. |
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526 // This code may be NULL depending on the macro DEBUG_MANGLING. |
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527 void check_mangled_unused_area_complete() PRODUCT_RETURN; |
| 0 | 528 |
| 529 // Size computations: sizes in bytes. | |
| 530 size_t capacity() const { return byte_size(bottom(), end()); } | |
| 531 size_t used() const { return byte_size(bottom(), top()); } | |
| 532 size_t free() const { return byte_size(top(), end()); } | |
| 533 | |
| 534 // Override from space. | |
| 535 bool is_in(const void* p) const; | |
| 536 | |
| 537 virtual bool is_free_block(const HeapWord* p) const; | |
| 538 | |
| 539 // In a contiguous space we have a more obvious bound on what parts | |
| 540 // contain objects. | |
| 541 MemRegion used_region() const { return MemRegion(bottom(), top()); } | |
| 542 | |
| 543 MemRegion used_region_at_save_marks() const { | |
| 544 return MemRegion(bottom(), saved_mark_word()); | |
| 545 } | |
| 546 | |
| 547 // Allocation (return NULL if full) | |
| 548 virtual HeapWord* allocate(size_t word_size); | |
| 549 virtual HeapWord* par_allocate(size_t word_size); | |
| 550 | |
| 551 virtual bool obj_allocated_since_save_marks(const oop obj) const { | |
| 552 return (HeapWord*)obj >= saved_mark_word(); | |
| 553 } | |
| 554 | |
| 555 // Iteration | |
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556 void oop_iterate(ExtendedOopClosure* cl); |
| 0 | 557 void object_iterate(ObjectClosure* blk); |
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558 // For contiguous spaces this method will iterate safely over objects |
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559 // in the space (i.e., between bottom and top) when at a safepoint. |
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560 void safe_object_iterate(ObjectClosure* blk); |
| 0 | 561 void object_iterate_mem(MemRegion mr, UpwardsObjectClosure* cl); |
| 562 // iterates on objects up to the safe limit | |
| 563 HeapWord* object_iterate_careful(ObjectClosureCareful* cl); | |
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564 HeapWord* concurrent_iteration_safe_limit() { |
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565 assert(_concurrent_iteration_safe_limit <= top(), |
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566 "_concurrent_iteration_safe_limit update missed"); |
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567 return _concurrent_iteration_safe_limit; |
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568 } |
| 0 | 569 // changes the safe limit, all objects from bottom() to the new |
| 570 // limit should be properly initialized | |
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571 void set_concurrent_iteration_safe_limit(HeapWord* new_limit) { |
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572 assert(new_limit <= top(), "uninitialized objects in the safe range"); |
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573 _concurrent_iteration_safe_limit = new_limit; |
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574 } |
| 0 | 575 |
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576 |
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577 #if INCLUDE_ALL_GCS |
| 0 | 578 // In support of parallel oop_iterate. |
| 579 #define ContigSpace_PAR_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ | |
| 580 void par_oop_iterate(MemRegion mr, OopClosureType* blk); | |
| 581 | |
| 582 ALL_PAR_OOP_ITERATE_CLOSURES(ContigSpace_PAR_OOP_ITERATE_DECL) | |
| 583 #undef ContigSpace_PAR_OOP_ITERATE_DECL | |
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584 #endif // INCLUDE_ALL_GCS |
| 0 | 585 |
| 586 // Compaction support | |
| 587 virtual void reset_after_compaction() { | |
| 588 assert(compaction_top() >= bottom() && compaction_top() <= end(), "should point inside space"); | |
| 589 set_top(compaction_top()); | |
| 590 // set new iteration safe limit | |
| 591 set_concurrent_iteration_safe_limit(compaction_top()); | |
| 592 } | |
| 593 virtual size_t minimum_free_block_size() const { return 0; } | |
| 594 | |
| 595 // Override. | |
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596 DirtyCardToOopClosure* new_dcto_cl(ExtendedOopClosure* cl, |
| 0 | 597 CardTableModRefBS::PrecisionStyle precision, |
| 598 HeapWord* boundary = NULL); | |
| 599 | |
| 600 // Apply "blk->do_oop" to the addresses of all reference fields in objects | |
| 601 // starting with the _saved_mark_word, which was noted during a generation's | |
| 602 // save_marks and is required to denote the head of an object. | |
| 603 // Fields in objects allocated by applications of the closure | |
| 604 // *are* included in the iteration. | |
| 605 // Updates _saved_mark_word to point to just after the last object | |
| 606 // iterated over. | |
| 607 #define ContigSpace_OOP_SINCE_SAVE_MARKS_DECL(OopClosureType, nv_suffix) \ | |
| 608 void oop_since_save_marks_iterate##nv_suffix(OopClosureType* blk); | |
| 609 | |
| 610 ALL_SINCE_SAVE_MARKS_CLOSURES(ContigSpace_OOP_SINCE_SAVE_MARKS_DECL) | |
| 611 #undef ContigSpace_OOP_SINCE_SAVE_MARKS_DECL | |
| 612 | |
| 613 // Same as object_iterate, but starting from "mark", which is required | |
| 614 // to denote the start of an object. Objects allocated by | |
| 615 // applications of the closure *are* included in the iteration. | |
| 616 virtual void object_iterate_from(WaterMark mark, ObjectClosure* blk); | |
| 617 | |
| 618 // Very inefficient implementation. | |
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619 virtual HeapWord* block_start_const(const void* p) const; |
| 0 | 620 size_t block_size(const HeapWord* p) const; |
| 621 // If a block is in the allocated area, it is an object. | |
| 622 bool block_is_obj(const HeapWord* p) const { return p < top(); } | |
| 623 | |
| 624 // Addresses for inlined allocation | |
| 625 HeapWord** top_addr() { return &_top; } | |
| 626 HeapWord** end_addr() { return &_end; } | |
| 627 | |
| 628 // Overrides for more efficient compaction support. | |
| 629 void prepare_for_compaction(CompactPoint* cp); | |
| 630 | |
| 631 // PrintHeapAtGC support. | |
| 632 virtual void print_on(outputStream* st) const; | |
| 633 | |
| 634 // Checked dynamic downcasts. | |
| 635 virtual ContiguousSpace* toContiguousSpace() { | |
| 636 return this; | |
| 637 } | |
| 638 | |
| 639 // Debugging | |
| 6008 | 640 virtual void verify() const; |
| 0 | 641 |
| 642 // Used to increase collection frequency. "factor" of 0 means entire | |
| 643 // space. | |
| 644 void allocate_temporary_filler(int factor); | |
| 645 | |
| 646 }; | |
| 647 | |
| 648 | |
| 649 // A dirty card to oop closure that does filtering. | |
| 650 // It knows how to filter out objects that are outside of the _boundary. | |
| 651 class Filtering_DCTOC : public DirtyCardToOopClosure { | |
| 652 protected: | |
| 653 // Override. | |
| 654 void walk_mem_region(MemRegion mr, | |
| 655 HeapWord* bottom, HeapWord* top); | |
| 656 | |
| 657 // Walk the given memory region, from bottom to top, applying | |
| 658 // the given oop closure to (possibly) all objects found. The | |
| 659 // given oop closure may or may not be the same as the oop | |
| 660 // closure with which this closure was created, as it may | |
| 661 // be a filtering closure which makes use of the _boundary. | |
| 662 // We offer two signatures, so the FilteringClosure static type is | |
| 663 // apparent. | |
| 664 virtual void walk_mem_region_with_cl(MemRegion mr, | |
| 665 HeapWord* bottom, HeapWord* top, | |
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666 ExtendedOopClosure* cl) = 0; |
| 0 | 667 virtual void walk_mem_region_with_cl(MemRegion mr, |
| 668 HeapWord* bottom, HeapWord* top, | |
| 669 FilteringClosure* cl) = 0; | |
| 670 | |
| 671 public: | |
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672 Filtering_DCTOC(Space* sp, ExtendedOopClosure* cl, |
| 0 | 673 CardTableModRefBS::PrecisionStyle precision, |
| 674 HeapWord* boundary) : | |
| 675 DirtyCardToOopClosure(sp, cl, precision, boundary) {} | |
| 676 }; | |
| 677 | |
| 678 // A dirty card to oop closure for contiguous spaces | |
| 679 // (ContiguousSpace and sub-classes). | |
| 680 // It is a FilteringClosure, as defined above, and it knows: | |
| 681 // | |
| 682 // 1. That the actual top of any area in a memory region | |
| 683 // contained by the space is bounded by the end of the contiguous | |
| 684 // region of the space. | |
| 685 // 2. That the space is really made up of objects and not just | |
| 686 // blocks. | |
| 687 | |
| 688 class ContiguousSpaceDCTOC : public Filtering_DCTOC { | |
| 689 protected: | |
| 690 // Overrides. | |
| 691 HeapWord* get_actual_top(HeapWord* top, HeapWord* top_obj); | |
| 692 | |
| 693 virtual void walk_mem_region_with_cl(MemRegion mr, | |
| 694 HeapWord* bottom, HeapWord* top, | |
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695 ExtendedOopClosure* cl); |
| 0 | 696 virtual void walk_mem_region_with_cl(MemRegion mr, |
| 697 HeapWord* bottom, HeapWord* top, | |
| 698 FilteringClosure* cl); | |
| 699 | |
| 700 public: | |
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701 ContiguousSpaceDCTOC(ContiguousSpace* sp, ExtendedOopClosure* cl, |
| 0 | 702 CardTableModRefBS::PrecisionStyle precision, |
| 703 HeapWord* boundary) : | |
| 704 Filtering_DCTOC(sp, cl, precision, boundary) | |
| 705 {} | |
| 706 }; | |
| 707 | |
| 708 | |
| 709 // Class EdenSpace describes eden-space in new generation. | |
| 710 | |
| 711 class DefNewGeneration; | |
| 712 | |
| 713 class EdenSpace : public ContiguousSpace { | |
| 714 friend class VMStructs; | |
| 715 private: | |
| 716 DefNewGeneration* _gen; | |
| 717 | |
| 718 // _soft_end is used as a soft limit on allocation. As soft limits are | |
| 719 // reached, the slow-path allocation code can invoke other actions and then | |
| 720 // adjust _soft_end up to a new soft limit or to end(). | |
| 721 HeapWord* _soft_end; | |
| 722 | |
| 723 public: | |
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724 EdenSpace(DefNewGeneration* gen) : |
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725 _gen(gen), _soft_end(NULL) {} |
| 0 | 726 |
| 727 // Get/set just the 'soft' limit. | |
| 728 HeapWord* soft_end() { return _soft_end; } | |
| 729 HeapWord** soft_end_addr() { return &_soft_end; } | |
| 730 void set_soft_end(HeapWord* value) { _soft_end = value; } | |
| 731 | |
| 732 // Override. | |
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733 void clear(bool mangle_space); |
| 0 | 734 |
| 735 // Set both the 'hard' and 'soft' limits (_end and _soft_end). | |
| 736 void set_end(HeapWord* value) { | |
| 737 set_soft_end(value); | |
| 738 ContiguousSpace::set_end(value); | |
| 739 } | |
| 740 | |
| 741 // Allocation (return NULL if full) | |
| 742 HeapWord* allocate(size_t word_size); | |
| 743 HeapWord* par_allocate(size_t word_size); | |
| 744 }; | |
| 745 | |
| 746 // Class ConcEdenSpace extends EdenSpace for the sake of safe | |
| 747 // allocation while soft-end is being modified concurrently | |
| 748 | |
| 749 class ConcEdenSpace : public EdenSpace { | |
| 750 public: | |
| 751 ConcEdenSpace(DefNewGeneration* gen) : EdenSpace(gen) { } | |
| 752 | |
| 753 // Allocation (return NULL if full) | |
| 754 HeapWord* par_allocate(size_t word_size); | |
| 755 }; | |
| 756 | |
| 757 | |
| 758 // A ContigSpace that Supports an efficient "block_start" operation via | |
| 759 // a BlockOffsetArray (whose BlockOffsetSharedArray may be shared with | |
| 760 // other spaces.) This is the abstract base class for old generation | |
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761 // (tenured) spaces. |
| 0 | 762 |
| 763 class OffsetTableContigSpace: public ContiguousSpace { | |
| 764 friend class VMStructs; | |
| 765 protected: | |
| 766 BlockOffsetArrayContigSpace _offsets; | |
| 767 Mutex _par_alloc_lock; | |
| 768 | |
| 769 public: | |
| 770 // Constructor | |
| 771 OffsetTableContigSpace(BlockOffsetSharedArray* sharedOffsetArray, | |
| 772 MemRegion mr); | |
| 773 | |
| 774 void set_bottom(HeapWord* value); | |
| 775 void set_end(HeapWord* value); | |
| 776 | |
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777 void clear(bool mangle_space); |
| 0 | 778 |
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779 inline HeapWord* block_start_const(const void* p) const; |
| 0 | 780 |
| 781 // Add offset table update. | |
| 782 virtual inline HeapWord* allocate(size_t word_size); | |
| 783 inline HeapWord* par_allocate(size_t word_size); | |
| 784 | |
| 785 // MarkSweep support phase3 | |
| 786 virtual HeapWord* initialize_threshold(); | |
| 787 virtual HeapWord* cross_threshold(HeapWord* start, HeapWord* end); | |
| 788 | |
| 789 virtual void print_on(outputStream* st) const; | |
| 790 | |
| 791 // Debugging | |
| 6008 | 792 void verify() const; |
| 0 | 793 }; |
| 794 | |
| 795 | |
| 796 // Class TenuredSpace is used by TenuredGeneration | |
| 797 | |
| 798 class TenuredSpace: public OffsetTableContigSpace { | |
| 799 friend class VMStructs; | |
| 800 protected: | |
| 801 // Mark sweep support | |
| 438 | 802 size_t allowed_dead_ratio() const; |
| 0 | 803 public: |
| 804 // Constructor | |
| 805 TenuredSpace(BlockOffsetSharedArray* sharedOffsetArray, | |
| 806 MemRegion mr) : | |
| 807 OffsetTableContigSpace(sharedOffsetArray, mr) {} | |
| 808 }; | |
| 1972 | 809 #endif // SHARE_VM_MEMORY_SPACE_HPP |