Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psPromotionLAB.cpp @ 1286:ab75c83d7c37
Merge
author | johnc |
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date | Tue, 02 Mar 2010 13:57:46 -0800 |
parents | d1605aabd0a1 |
children | c18cbe5936b8 |
rev | line source |
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0 | 1 /* |
196 | 2 * Copyright 2002-2008 Sun Microsystems, Inc. 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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 #include "incls/_precompiled.incl" | |
26 #include "incls/_psPromotionLAB.cpp.incl" | |
27 | |
113
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28 size_t PSPromotionLAB::filler_header_size; |
0 | 29 |
30 // This is the shared initialization code. It sets up the basic pointers, | |
31 // and allows enough extra space for a filler object. We call a virtual | |
32 // method, "lab_is_valid()" to handle the different asserts the old/young | |
33 // labs require. | |
34 void PSPromotionLAB::initialize(MemRegion lab) { | |
35 assert(lab_is_valid(lab), "Sanity"); | |
36 | |
37 HeapWord* bottom = lab.start(); | |
38 HeapWord* end = lab.end(); | |
39 | |
40 set_bottom(bottom); | |
41 set_end(end); | |
42 set_top(bottom); | |
43 | |
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44 // Initialize after VM starts up because header_size depends on compressed |
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45 // oops. |
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46 filler_header_size = align_object_size(typeArrayOopDesc::header_size(T_INT)); |
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47 |
0 | 48 // We can be initialized to a zero size! |
49 if (free() > 0) { | |
50 if (ZapUnusedHeapArea) { | |
51 debug_only(Copy::fill_to_words(top(), free()/HeapWordSize, badHeapWord)); | |
52 } | |
53 | |
54 // NOTE! We need to allow space for a filler object. | |
55 assert(lab.word_size() >= filler_header_size, "lab is too small"); | |
56 end = end - filler_header_size; | |
57 set_end(end); | |
58 | |
59 _state = needs_flush; | |
60 } else { | |
61 _state = zero_size; | |
62 } | |
63 | |
64 assert(this->top() <= this->end(), "pointers out of order"); | |
65 } | |
66 | |
67 // Fill all remaining lab space with an unreachable object. | |
68 // The goal is to leave a contiguous parseable span of objects. | |
69 void PSPromotionLAB::flush() { | |
70 assert(_state != flushed, "Attempt to flush PLAB twice"); | |
71 assert(top() <= end(), "pointers out of order"); | |
72 | |
73 // If we were initialized to a zero sized lab, there is | |
74 // nothing to flush | |
75 if (_state == zero_size) | |
76 return; | |
77 | |
78 // PLAB's never allocate the last aligned_header_size | |
79 // so they can always fill with an array. | |
80 HeapWord* tlab_end = end() + filler_header_size; | |
81 typeArrayOop filler_oop = (typeArrayOop) top(); | |
82 filler_oop->set_mark(markOopDesc::prototype()); | |
83 filler_oop->set_klass(Universe::intArrayKlassObj()); | |
84 const size_t array_length = | |
85 pointer_delta(tlab_end, top()) - typeArrayOopDesc::header_size(T_INT); | |
86 assert( (array_length * (HeapWordSize/sizeof(jint))) < (size_t)max_jint, "array too big in PSPromotionLAB"); | |
87 filler_oop->set_length((int)(array_length * (HeapWordSize/sizeof(jint)))); | |
88 | |
89 #ifdef ASSERT | |
90 // Note that we actually DO NOT want to use the aligned header size! | |
91 HeapWord* elt_words = ((HeapWord*)filler_oop) + typeArrayOopDesc::header_size(T_INT); | |
92 Copy::fill_to_words(elt_words, array_length, 0xDEAABABE); | |
93 #endif | |
94 | |
95 set_bottom(NULL); | |
96 set_end(NULL); | |
97 set_top(NULL); | |
98 | |
99 _state = flushed; | |
100 } | |
101 | |
102 bool PSPromotionLAB::unallocate_object(oop obj) { | |
103 assert(Universe::heap()->is_in(obj), "Object outside heap"); | |
104 | |
105 if (contains(obj)) { | |
106 HeapWord* object_end = (HeapWord*)obj + obj->size(); | |
107 assert(object_end <= top(), "Object crosses promotion LAB boundary"); | |
108 | |
109 if (object_end == top()) { | |
110 set_top((HeapWord*)obj); | |
111 return true; | |
112 } | |
113 } | |
114 | |
115 return false; | |
116 } | |
117 | |
118 // Fill all remaining lab space with an unreachable object. | |
119 // The goal is to leave a contiguous parseable span of objects. | |
120 void PSOldPromotionLAB::flush() { | |
121 assert(_state != flushed, "Attempt to flush PLAB twice"); | |
122 assert(top() <= end(), "pointers out of order"); | |
123 | |
124 if (_state == zero_size) | |
125 return; | |
126 | |
127 HeapWord* obj = top(); | |
128 | |
129 PSPromotionLAB::flush(); | |
130 | |
131 assert(_start_array != NULL, "Sanity"); | |
132 | |
133 _start_array->allocate_block(obj); | |
134 } | |
135 | |
136 #ifdef ASSERT | |
137 | |
138 bool PSYoungPromotionLAB::lab_is_valid(MemRegion lab) { | |
139 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
140 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
141 | |
142 MutableSpace* to_space = heap->young_gen()->to_space(); | |
143 MemRegion used = to_space->used_region(); | |
144 if (used.contains(lab)) { | |
145 return true; | |
146 } | |
147 | |
148 return false; | |
149 } | |
150 | |
151 bool PSOldPromotionLAB::lab_is_valid(MemRegion lab) { | |
152 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
153 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
154 assert(_start_array->covered_region().contains(lab), "Sanity"); | |
155 | |
156 PSOldGen* old_gen = heap->old_gen(); | |
157 MemRegion used = old_gen->object_space()->used_region(); | |
158 | |
159 if (used.contains(lab)) { | |
160 return true; | |
161 } | |
162 | |
163 return false; | |
164 } | |
165 | |
166 #endif /* ASSERT */ |