Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/parallelScavenge/psPromotionLAB.hpp @ 20804:7848fc12602b
Merge with jdk8u40-b25
| author | Gilles Duboscq <gilles.m.duboscq@oracle.com> |
|---|---|
| date | Tue, 07 Apr 2015 14:58:49 +0200 |
| parents | 4ca6dc0799b6 ee019285a52c |
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| rev | line source |
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| 0 | 1 /* |
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2 * Copyright (c) 2002, 2012, 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_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPROMOTIONLAB_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPROMOTIONLAB_HPP | |
| 27 | |
| 28 #include "gc_implementation/parallelScavenge/objectStartArray.hpp" | |
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29 #include "gc_interface/collectedHeap.inline.hpp" |
| 1972 | 30 #include "memory/allocation.hpp" |
| 31 | |
| 0 | 32 // |
| 33 // PSPromotionLAB is a parallel scavenge promotion lab. This class acts very | |
| 34 // much like a MutableSpace. We couldn't embed a MutableSpace, though, as | |
| 35 // it has a considerable number of asserts and invariants that are violated. | |
| 36 // | |
| 37 | |
| 38 class ObjectStartArray; | |
| 39 | |
| 6197 | 40 class PSPromotionLAB : public CHeapObj<mtGC> { |
| 0 | 41 protected: |
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42 static size_t filler_header_size; |
| 0 | 43 |
| 44 enum LabState { | |
| 45 needs_flush, | |
| 46 flushed, | |
| 47 zero_size | |
| 48 }; | |
| 49 | |
| 50 HeapWord* _top; | |
| 51 HeapWord* _bottom; | |
| 52 HeapWord* _end; | |
| 53 LabState _state; | |
| 54 | |
| 55 void set_top(HeapWord* value) { _top = value; } | |
| 56 void set_bottom(HeapWord* value) { _bottom = value; } | |
| 57 void set_end(HeapWord* value) { _end = value; } | |
| 58 | |
| 59 // The shared initialize code invokes this. | |
| 60 debug_only(virtual bool lab_is_valid(MemRegion lab) { return false; }); | |
| 61 | |
| 62 PSPromotionLAB() : _top(NULL), _bottom(NULL), _end(NULL) { } | |
| 63 | |
| 64 public: | |
| 65 // Filling and flushing. | |
| 66 void initialize(MemRegion lab); | |
| 67 | |
| 68 virtual void flush(); | |
| 69 | |
| 70 // Accessors | |
| 71 HeapWord* bottom() const { return _bottom; } | |
| 72 HeapWord* end() const { return _end; } | |
| 73 HeapWord* top() const { return _top; } | |
| 74 | |
| 75 bool is_flushed() { return _state == flushed; } | |
| 76 | |
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77 bool unallocate_object(HeapWord* obj, size_t obj_size); |
| 0 | 78 |
| 79 // Returns a subregion containing all objects in this space. | |
| 80 MemRegion used_region() { return MemRegion(bottom(), top()); } | |
| 81 | |
| 82 // Boolean querries. | |
| 83 bool is_empty() const { return used() == 0; } | |
| 84 bool not_empty() const { return used() > 0; } | |
| 85 bool contains(const void* p) const { return _bottom <= p && p < _end; } | |
| 86 | |
| 87 // Size computations. Sizes are in bytes. | |
| 88 size_t capacity() const { return byte_size(bottom(), end()); } | |
| 89 size_t used() const { return byte_size(bottom(), top()); } | |
| 90 size_t free() const { return byte_size(top(), end()); } | |
| 91 }; | |
| 92 | |
| 93 class PSYoungPromotionLAB : public PSPromotionLAB { | |
| 94 public: | |
| 95 PSYoungPromotionLAB() { } | |
| 96 | |
| 97 // Not MT safe | |
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98 inline HeapWord* allocate(size_t size); |
| 0 | 99 |
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100 debug_only(virtual bool lab_is_valid(MemRegion lab);) |
| 0 | 101 }; |
| 102 | |
| 103 class PSOldPromotionLAB : public PSPromotionLAB { | |
| 104 private: | |
| 105 ObjectStartArray* _start_array; | |
| 106 | |
| 107 public: | |
| 108 PSOldPromotionLAB() : _start_array(NULL) { } | |
| 109 PSOldPromotionLAB(ObjectStartArray* start_array) : _start_array(start_array) { } | |
| 110 | |
| 111 void set_start_array(ObjectStartArray* start_array) { _start_array = start_array; } | |
| 112 | |
| 113 void flush(); | |
| 114 | |
| 115 // Not MT safe | |
| 116 HeapWord* allocate(size_t size) { | |
| 117 // Cannot test for this now that we're doing promotion failures | |
| 118 // assert(_state != flushed, "Sanity"); | |
| 119 assert(_start_array != NULL, "Sanity"); | |
| 120 HeapWord* obj = top(); | |
| 121 HeapWord* new_top = obj + size; | |
| 122 // The 'new_top>obj' check is needed to detect overflow of obj+size. | |
| 123 if (new_top > obj && new_top <= end()) { | |
| 124 set_top(new_top); | |
| 125 assert(is_object_aligned((intptr_t)obj) && is_object_aligned((intptr_t)new_top), | |
| 126 "checking alignment"); | |
| 127 _start_array->allocate_block(obj); | |
| 128 return obj; | |
| 129 } | |
| 130 | |
| 131 return NULL; | |
| 132 } | |
| 133 | |
| 134 debug_only(virtual bool lab_is_valid(MemRegion lab)); | |
| 135 }; | |
| 1972 | 136 |
| 137 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPROMOTIONLAB_HPP |