Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psPromotionLAB.hpp @ 1562:dfe27f03244a
Merge
author | trims |
---|---|
date | Tue, 01 Jun 2010 11:48:33 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
rev | line source |
---|---|
0 | 1 /* |
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
196
diff
changeset
|
2 * Copyright (c) 2002, 2008, 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 * | |
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
196
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
196
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
196
diff
changeset
|
21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 // | |
26 // PSPromotionLAB is a parallel scavenge promotion lab. This class acts very | |
27 // much like a MutableSpace. We couldn't embed a MutableSpace, though, as | |
28 // it has a considerable number of asserts and invariants that are violated. | |
29 // | |
30 | |
31 class ObjectStartArray; | |
32 | |
33 class PSPromotionLAB : public CHeapObj { | |
34 protected: | |
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
35 static size_t filler_header_size; |
0 | 36 |
37 enum LabState { | |
38 needs_flush, | |
39 flushed, | |
40 zero_size | |
41 }; | |
42 | |
43 HeapWord* _top; | |
44 HeapWord* _bottom; | |
45 HeapWord* _end; | |
46 LabState _state; | |
47 | |
48 void set_top(HeapWord* value) { _top = value; } | |
49 void set_bottom(HeapWord* value) { _bottom = value; } | |
50 void set_end(HeapWord* value) { _end = value; } | |
51 | |
52 // The shared initialize code invokes this. | |
53 debug_only(virtual bool lab_is_valid(MemRegion lab) { return false; }); | |
54 | |
55 PSPromotionLAB() : _top(NULL), _bottom(NULL), _end(NULL) { } | |
56 | |
57 public: | |
58 // Filling and flushing. | |
59 void initialize(MemRegion lab); | |
60 | |
61 virtual void flush(); | |
62 | |
63 // Accessors | |
64 HeapWord* bottom() const { return _bottom; } | |
65 HeapWord* end() const { return _end; } | |
66 HeapWord* top() const { return _top; } | |
67 | |
68 bool is_flushed() { return _state == flushed; } | |
69 | |
70 bool unallocate_object(oop obj); | |
71 | |
72 // Returns a subregion containing all objects in this space. | |
73 MemRegion used_region() { return MemRegion(bottom(), top()); } | |
74 | |
75 // Boolean querries. | |
76 bool is_empty() const { return used() == 0; } | |
77 bool not_empty() const { return used() > 0; } | |
78 bool contains(const void* p) const { return _bottom <= p && p < _end; } | |
79 | |
80 // Size computations. Sizes are in bytes. | |
81 size_t capacity() const { return byte_size(bottom(), end()); } | |
82 size_t used() const { return byte_size(bottom(), top()); } | |
83 size_t free() const { return byte_size(top(), end()); } | |
84 }; | |
85 | |
86 class PSYoungPromotionLAB : public PSPromotionLAB { | |
87 public: | |
88 PSYoungPromotionLAB() { } | |
89 | |
90 // Not MT safe | |
91 HeapWord* allocate(size_t size) { | |
92 // Can't assert this, when young fills, we keep the LAB around, but flushed. | |
93 // assert(_state != flushed, "Sanity"); | |
94 HeapWord* obj = top(); | |
95 HeapWord* new_top = obj + size; | |
96 // The 'new_top>obj' check is needed to detect overflow of obj+size. | |
97 if (new_top > obj && new_top <= end()) { | |
98 set_top(new_top); | |
99 assert(is_object_aligned((intptr_t)obj) && is_object_aligned((intptr_t)new_top), | |
100 "checking alignment"); | |
101 return obj; | |
102 } | |
103 | |
104 return NULL; | |
105 } | |
106 | |
107 debug_only(virtual bool lab_is_valid(MemRegion lab)); | |
108 }; | |
109 | |
110 class PSOldPromotionLAB : public PSPromotionLAB { | |
111 private: | |
112 ObjectStartArray* _start_array; | |
113 | |
114 public: | |
115 PSOldPromotionLAB() : _start_array(NULL) { } | |
116 PSOldPromotionLAB(ObjectStartArray* start_array) : _start_array(start_array) { } | |
117 | |
118 void set_start_array(ObjectStartArray* start_array) { _start_array = start_array; } | |
119 | |
120 void flush(); | |
121 | |
122 // Not MT safe | |
123 HeapWord* allocate(size_t size) { | |
124 // Cannot test for this now that we're doing promotion failures | |
125 // assert(_state != flushed, "Sanity"); | |
126 assert(_start_array != NULL, "Sanity"); | |
127 HeapWord* obj = top(); | |
128 HeapWord* new_top = obj + size; | |
129 // The 'new_top>obj' check is needed to detect overflow of obj+size. | |
130 if (new_top > obj && new_top <= end()) { | |
131 set_top(new_top); | |
132 assert(is_object_aligned((intptr_t)obj) && is_object_aligned((intptr_t)new_top), | |
133 "checking alignment"); | |
134 _start_array->allocate_block(obj); | |
135 return obj; | |
136 } | |
137 | |
138 return NULL; | |
139 } | |
140 | |
141 debug_only(virtual bool lab_is_valid(MemRegion lab)); | |
142 }; |