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annotate src/share/vm/gc_implementation/parallelScavenge/psPromotionLAB.cpp @ 3710:4e037604f6ee
use alignment for constants specified in DataPatch.alignment
author | Christian Wimmer <christian.wimmer@oracle.com> |
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date | Mon, 05 Dec 2011 18:15:25 -0800 |
parents | f95d63e2154a |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2002, 2010, 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
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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 #include "precompiled.hpp" |
26 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" | |
27 #include "gc_implementation/parallelScavenge/psPromotionLAB.hpp" | |
28 #include "gc_implementation/shared/mutableSpace.hpp" | |
29 #include "oops/oop.inline.hpp" | |
0 | 30 |
113
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31 size_t PSPromotionLAB::filler_header_size; |
0 | 32 |
33 // This is the shared initialization code. It sets up the basic pointers, | |
34 // and allows enough extra space for a filler object. We call a virtual | |
35 // method, "lab_is_valid()" to handle the different asserts the old/young | |
36 // labs require. | |
37 void PSPromotionLAB::initialize(MemRegion lab) { | |
38 assert(lab_is_valid(lab), "Sanity"); | |
39 | |
40 HeapWord* bottom = lab.start(); | |
41 HeapWord* end = lab.end(); | |
42 | |
43 set_bottom(bottom); | |
44 set_end(end); | |
45 set_top(bottom); | |
46 | |
113
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47 // Initialize after VM starts up because header_size depends on compressed |
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48 // oops. |
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49 filler_header_size = align_object_size(typeArrayOopDesc::header_size(T_INT)); |
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50 |
0 | 51 // We can be initialized to a zero size! |
52 if (free() > 0) { | |
53 if (ZapUnusedHeapArea) { | |
54 debug_only(Copy::fill_to_words(top(), free()/HeapWordSize, badHeapWord)); | |
55 } | |
56 | |
57 // NOTE! We need to allow space for a filler object. | |
58 assert(lab.word_size() >= filler_header_size, "lab is too small"); | |
59 end = end - filler_header_size; | |
60 set_end(end); | |
61 | |
62 _state = needs_flush; | |
63 } else { | |
64 _state = zero_size; | |
65 } | |
66 | |
67 assert(this->top() <= this->end(), "pointers out of order"); | |
68 } | |
69 | |
70 // Fill all remaining lab space with an unreachable object. | |
71 // The goal is to leave a contiguous parseable span of objects. | |
72 void PSPromotionLAB::flush() { | |
73 assert(_state != flushed, "Attempt to flush PLAB twice"); | |
74 assert(top() <= end(), "pointers out of order"); | |
75 | |
76 // If we were initialized to a zero sized lab, there is | |
77 // nothing to flush | |
78 if (_state == zero_size) | |
79 return; | |
80 | |
81 // PLAB's never allocate the last aligned_header_size | |
82 // so they can always fill with an array. | |
83 HeapWord* tlab_end = end() + filler_header_size; | |
84 typeArrayOop filler_oop = (typeArrayOop) top(); | |
85 filler_oop->set_mark(markOopDesc::prototype()); | |
86 filler_oop->set_klass(Universe::intArrayKlassObj()); | |
87 const size_t array_length = | |
88 pointer_delta(tlab_end, top()) - typeArrayOopDesc::header_size(T_INT); | |
89 assert( (array_length * (HeapWordSize/sizeof(jint))) < (size_t)max_jint, "array too big in PSPromotionLAB"); | |
90 filler_oop->set_length((int)(array_length * (HeapWordSize/sizeof(jint)))); | |
91 | |
92 #ifdef ASSERT | |
93 // Note that we actually DO NOT want to use the aligned header size! | |
94 HeapWord* elt_words = ((HeapWord*)filler_oop) + typeArrayOopDesc::header_size(T_INT); | |
95 Copy::fill_to_words(elt_words, array_length, 0xDEAABABE); | |
96 #endif | |
97 | |
98 set_bottom(NULL); | |
99 set_end(NULL); | |
100 set_top(NULL); | |
101 | |
102 _state = flushed; | |
103 } | |
104 | |
105 bool PSPromotionLAB::unallocate_object(oop obj) { | |
106 assert(Universe::heap()->is_in(obj), "Object outside heap"); | |
107 | |
108 if (contains(obj)) { | |
109 HeapWord* object_end = (HeapWord*)obj + obj->size(); | |
110 assert(object_end <= top(), "Object crosses promotion LAB boundary"); | |
111 | |
112 if (object_end == top()) { | |
113 set_top((HeapWord*)obj); | |
114 return true; | |
115 } | |
116 } | |
117 | |
118 return false; | |
119 } | |
120 | |
121 // Fill all remaining lab space with an unreachable object. | |
122 // The goal is to leave a contiguous parseable span of objects. | |
123 void PSOldPromotionLAB::flush() { | |
124 assert(_state != flushed, "Attempt to flush PLAB twice"); | |
125 assert(top() <= end(), "pointers out of order"); | |
126 | |
127 if (_state == zero_size) | |
128 return; | |
129 | |
130 HeapWord* obj = top(); | |
131 | |
132 PSPromotionLAB::flush(); | |
133 | |
134 assert(_start_array != NULL, "Sanity"); | |
135 | |
136 _start_array->allocate_block(obj); | |
137 } | |
138 | |
139 #ifdef ASSERT | |
140 | |
141 bool PSYoungPromotionLAB::lab_is_valid(MemRegion lab) { | |
142 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
143 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
144 | |
145 MutableSpace* to_space = heap->young_gen()->to_space(); | |
146 MemRegion used = to_space->used_region(); | |
147 if (used.contains(lab)) { | |
148 return true; | |
149 } | |
150 | |
151 return false; | |
152 } | |
153 | |
154 bool PSOldPromotionLAB::lab_is_valid(MemRegion lab) { | |
155 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
156 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
157 assert(_start_array->covered_region().contains(lab), "Sanity"); | |
158 | |
159 PSOldGen* old_gen = heap->old_gen(); | |
160 MemRegion used = old_gen->object_space()->used_region(); | |
161 | |
162 if (used.contains(lab)) { | |
163 return true; | |
164 } | |
165 | |
166 return false; | |
167 } | |
168 | |
169 #endif /* ASSERT */ |