Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/objectStartArray.cpp @ 19083:09292c24d555
LSStackSlotAllocator: hide inner class.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Sat, 31 Jan 2015 11:07:15 +0100 |
parents | 52b4284cb496 |
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rev | line source |
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0 | 1 /* |
17524 | 2 * Copyright (c) 2001, 2013, 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 #include "precompiled.hpp" |
26 #include "gc_implementation/parallelScavenge/objectStartArray.hpp" | |
27 #include "memory/allocation.inline.hpp" | |
28 #include "memory/cardTableModRefBS.hpp" | |
29 #include "oops/oop.inline.hpp" | |
30 #include "runtime/java.hpp" | |
6197 | 31 #include "services/memTracker.hpp" |
0 | 32 |
33 void ObjectStartArray::initialize(MemRegion reserved_region) { | |
34 // We're based on the assumption that we use the same | |
35 // size blocks as the card table. | |
36 assert((int)block_size == (int)CardTableModRefBS::card_size, "Sanity"); | |
37 assert((int)block_size <= 512, "block_size must be less than or equal to 512"); | |
38 | |
39 // Calculate how much space must be reserved | |
40 _reserved_region = reserved_region; | |
41 | |
42 size_t bytes_to_reserve = reserved_region.word_size() / block_size_in_words; | |
43 assert(bytes_to_reserve > 0, "Sanity"); | |
44 | |
45 bytes_to_reserve = | |
46 align_size_up(bytes_to_reserve, os::vm_allocation_granularity()); | |
47 | |
48 // Do not use large-pages for the backing store. The one large page region | |
49 // will be used for the heap proper. | |
50 ReservedSpace backing_store(bytes_to_reserve); | |
51 if (!backing_store.is_reserved()) { | |
52 vm_exit_during_initialization("Could not reserve space for ObjectStartArray"); | |
53 } | |
6197 | 54 MemTracker::record_virtual_memory_type((address)backing_store.base(), mtGC); |
0 | 55 |
56 // We do not commit any memory initially | |
57 if (!_virtual_space.initialize(backing_store, 0)) { | |
58 vm_exit_during_initialization("Could not commit space for ObjectStartArray"); | |
59 } | |
60 | |
61 _raw_base = (jbyte*)_virtual_space.low_boundary(); | |
6197 | 62 |
0 | 63 if (_raw_base == NULL) { |
64 vm_exit_during_initialization("Could not get raw_base address"); | |
65 } | |
66 | |
6197 | 67 MemTracker::record_virtual_memory_type((address)_raw_base, mtGC); |
68 | |
69 | |
0 | 70 _offset_base = _raw_base - (size_t(reserved_region.start()) >> block_shift); |
71 | |
72 _covered_region.set_start(reserved_region.start()); | |
73 _covered_region.set_word_size(0); | |
74 | |
75 _blocks_region.set_start((HeapWord*)_raw_base); | |
76 _blocks_region.set_word_size(0); | |
77 } | |
78 | |
79 void ObjectStartArray::set_covered_region(MemRegion mr) { | |
80 assert(_reserved_region.contains(mr), "MemRegion outside of reserved space"); | |
81 assert(_reserved_region.start() == mr.start(), "Attempt to move covered region"); | |
82 | |
83 HeapWord* low_bound = mr.start(); | |
84 HeapWord* high_bound = mr.end(); | |
85 assert((uintptr_t(low_bound) & (block_size - 1)) == 0, "heap must start at block boundary"); | |
86 assert((uintptr_t(high_bound) & (block_size - 1)) == 0, "heap must end at block boundary"); | |
87 | |
88 size_t requested_blocks_size_in_bytes = mr.word_size() / block_size_in_words; | |
89 | |
90 // Only commit memory in page sized chunks | |
91 requested_blocks_size_in_bytes = | |
92 align_size_up(requested_blocks_size_in_bytes, os::vm_page_size()); | |
93 | |
94 _covered_region = mr; | |
95 | |
96 size_t current_blocks_size_in_bytes = _blocks_region.byte_size(); | |
97 | |
98 if (requested_blocks_size_in_bytes > current_blocks_size_in_bytes) { | |
99 // Expand | |
100 size_t expand_by = requested_blocks_size_in_bytes - current_blocks_size_in_bytes; | |
101 if (!_virtual_space.expand_by(expand_by)) { | |
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102 vm_exit_out_of_memory(expand_by, OOM_MMAP_ERROR, "object start array expansion"); |
0 | 103 } |
104 // Clear *only* the newly allocated region | |
105 memset(_blocks_region.end(), clean_block, expand_by); | |
106 } | |
107 | |
108 if (requested_blocks_size_in_bytes < current_blocks_size_in_bytes) { | |
109 // Shrink | |
110 size_t shrink_by = current_blocks_size_in_bytes - requested_blocks_size_in_bytes; | |
111 _virtual_space.shrink_by(shrink_by); | |
112 } | |
113 | |
114 _blocks_region.set_word_size(requested_blocks_size_in_bytes / sizeof(HeapWord)); | |
115 | |
116 assert(requested_blocks_size_in_bytes % sizeof(HeapWord) == 0, "Block table not expanded in word sized increment"); | |
117 assert(requested_blocks_size_in_bytes == _blocks_region.byte_size(), "Sanity"); | |
118 assert(block_for_addr(low_bound) == &_raw_base[0], "Checking start of map"); | |
119 assert(block_for_addr(high_bound-1) <= &_raw_base[_blocks_region.byte_size()-1], "Checking end of map"); | |
120 } | |
121 | |
122 void ObjectStartArray::reset() { | |
123 memset(_blocks_region.start(), clean_block, _blocks_region.byte_size()); | |
124 } | |
125 | |
126 | |
127 bool ObjectStartArray::object_starts_in_range(HeapWord* start_addr, | |
128 HeapWord* end_addr) const { | |
129 assert(start_addr <= end_addr, "range is wrong"); | |
130 if (start_addr > end_addr) { | |
131 return false; | |
132 } | |
133 | |
134 jbyte* start_block = block_for_addr(start_addr); | |
135 jbyte* end_block = block_for_addr(end_addr); | |
136 | |
137 for (jbyte* block = start_block; block <= end_block; block++) { | |
138 if (*block != clean_block) { | |
139 return true; | |
140 } | |
141 } | |
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142 |
0 | 143 return false; |
144 } |