Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/parallelScavenge/psMarkSweepDecorator.hpp @ 10185:d50cc62e94ff
8012715: G1: GraphKit accesses PtrQueue::_index as int but is size_t
Summary: In graphKit INT operations were generated to access PtrQueue::_index which has type size_t. This is 64 bit on 64-bit machines. No problems occur on little endian machines as long as the index fits into 32 bit, but on big endian machines the upper part is read, which is zero. This leads to unnecessary branches to the slow path in the runtime.
Reviewed-by: twisti, johnc
Contributed-by: Martin Doerr <martin.doerr@sap.com>
| author | johnc |
|---|---|
| date | Wed, 24 Apr 2013 14:48:43 -0700 |
| parents | da91efe96a93 |
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| rev | line source |
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| 0 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
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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_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSMARKSWEEPDECORATOR_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSMARKSWEEPDECORATOR_HPP | |
| 27 | |
| 28 #include "gc_implementation/shared/mutableSpace.hpp" | |
| 29 | |
| 0 | 30 // |
| 31 // A PSMarkSweepDecorator is used to add "ParallelScavenge" style mark sweep operations | |
| 32 // to a MutableSpace. | |
| 33 // | |
| 34 | |
| 35 class ObjectStartArray; | |
| 36 | |
| 6197 | 37 class PSMarkSweepDecorator: public CHeapObj<mtGC> { |
| 0 | 38 private: |
| 39 static PSMarkSweepDecorator* _destination_decorator; | |
| 40 | |
| 41 protected: | |
| 42 MutableSpace* _space; | |
| 43 ObjectStartArray* _start_array; | |
| 44 HeapWord* _first_dead; | |
| 45 HeapWord* _end_of_live; | |
| 46 HeapWord* _compaction_top; | |
| 438 | 47 size_t _allowed_dead_ratio; |
| 0 | 48 |
| 438 | 49 bool insert_deadspace(size_t& allowed_deadspace_words, HeapWord* q, |
| 50 size_t word_len); | |
| 0 | 51 |
| 52 public: | |
| 53 PSMarkSweepDecorator(MutableSpace* space, ObjectStartArray* start_array, | |
| 438 | 54 size_t allowed_dead_ratio) : |
| 55 _space(space), _start_array(start_array), | |
| 56 _allowed_dead_ratio(allowed_dead_ratio) { } | |
| 0 | 57 |
| 58 // During a compacting collection, we need to collapse objects into | |
| 59 // spaces in a given order. We want to fill space A, space B, and so | |
| 60 // on. The code that controls that order is in the following methods. | |
| 61 static void set_destination_decorator_tenured(); | |
| 62 static void advance_destination_decorator(); | |
| 63 static PSMarkSweepDecorator* destination_decorator(); | |
| 64 | |
| 65 // Accessors | |
| 438 | 66 MutableSpace* space() { return _space; } |
| 67 ObjectStartArray* start_array() { return _start_array; } | |
| 0 | 68 |
| 438 | 69 HeapWord* compaction_top() { return _compaction_top; } |
| 70 void set_compaction_top(HeapWord* value) { _compaction_top = value; } | |
| 0 | 71 |
| 438 | 72 size_t allowed_dead_ratio() { return _allowed_dead_ratio; } |
| 73 void set_allowed_dead_ratio(size_t value) { _allowed_dead_ratio = value; } | |
| 0 | 74 |
| 75 // Work methods | |
| 76 void adjust_pointers(); | |
| 77 void precompact(); | |
| 78 void compact(bool mangle_free_space); | |
| 79 }; | |
| 1972 | 80 |
| 81 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSMARKSWEEPDECORATOR_HPP |