Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/parMarkBitMap.cpp @ 14213:6c4c27c5cc9a
8029366: ShouldNotReachHere error when creating an array with component type of void
Reviewed-by: kvn
author | twisti |
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date | Fri, 06 Dec 2013 16:43:56 -0800 |
parents | 10f759898d40 |
children | bdd155477289 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2005, 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/parMarkBitMap.hpp" | |
27 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp" | |
28 #include "oops/oop.inline.hpp" | |
29 #include "runtime/os.hpp" | |
30 #include "utilities/bitMap.inline.hpp" | |
6197 | 31 #include "services/memTracker.hpp" |
1972 | 32 #ifdef TARGET_OS_FAMILY_linux |
33 # include "os_linux.inline.hpp" | |
34 #endif | |
35 #ifdef TARGET_OS_FAMILY_solaris | |
36 # include "os_solaris.inline.hpp" | |
37 #endif | |
38 #ifdef TARGET_OS_FAMILY_windows | |
39 # include "os_windows.inline.hpp" | |
40 #endif | |
3960 | 41 #ifdef TARGET_OS_FAMILY_bsd |
42 # include "os_bsd.inline.hpp" | |
43 #endif | |
0 | 44 |
45 bool | |
46 ParMarkBitMap::initialize(MemRegion covered_region) | |
47 { | |
48 const idx_t bits = bits_required(covered_region); | |
49 // The bits will be divided evenly between two bitmaps; each of them should be | |
50 // an integral number of words. | |
51 assert(bits % (BitsPerWord * 2) == 0, "region size unaligned"); | |
52 | |
53 const size_t words = bits / BitsPerWord; | |
54 const size_t raw_bytes = words * sizeof(idx_t); | |
55 const size_t page_sz = os::page_size_for_region(raw_bytes, raw_bytes, 10); | |
56 const size_t granularity = os::vm_allocation_granularity(); | |
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57 _reserved_byte_size = align_size_up(raw_bytes, MAX2(page_sz, granularity)); |
0 | 58 |
59 const size_t rs_align = page_sz == (size_t) os::vm_page_size() ? 0 : | |
60 MAX2(page_sz, granularity); | |
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61 ReservedSpace rs(_reserved_byte_size, rs_align, rs_align > 0); |
0 | 62 os::trace_page_sizes("par bitmap", raw_bytes, raw_bytes, page_sz, |
63 rs.base(), rs.size()); | |
6197 | 64 |
65 MemTracker::record_virtual_memory_type((address)rs.base(), mtGC); | |
66 | |
0 | 67 _virtual_space = new PSVirtualSpace(rs, page_sz); |
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68 if (_virtual_space != NULL && _virtual_space->expand_by(_reserved_byte_size)) { |
0 | 69 _region_start = covered_region.start(); |
70 _region_size = covered_region.word_size(); | |
71 idx_t* map = (idx_t*)_virtual_space->reserved_low_addr(); | |
72 _beg_bits.set_map(map); | |
73 _beg_bits.set_size(bits / 2); | |
74 _end_bits.set_map(map + words / 2); | |
75 _end_bits.set_size(bits / 2); | |
76 return true; | |
77 } | |
78 | |
79 _region_start = 0; | |
80 _region_size = 0; | |
81 if (_virtual_space != NULL) { | |
82 delete _virtual_space; | |
83 _virtual_space = NULL; | |
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84 // Release memory reserved in the space. |
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85 rs.release(); |
0 | 86 } |
87 return false; | |
88 } | |
89 | |
90 #ifdef ASSERT | |
91 extern size_t mark_bitmap_count; | |
92 extern size_t mark_bitmap_size; | |
93 #endif // #ifdef ASSERT | |
94 | |
95 bool | |
96 ParMarkBitMap::mark_obj(HeapWord* addr, size_t size) | |
97 { | |
98 const idx_t beg_bit = addr_to_bit(addr); | |
99 if (_beg_bits.par_set_bit(beg_bit)) { | |
100 const idx_t end_bit = addr_to_bit(addr + size - 1); | |
101 bool end_bit_ok = _end_bits.par_set_bit(end_bit); | |
102 assert(end_bit_ok, "concurrency problem"); | |
103 DEBUG_ONLY(Atomic::inc_ptr(&mark_bitmap_count)); | |
104 DEBUG_ONLY(Atomic::add_ptr(size, &mark_bitmap_size)); | |
105 return true; | |
106 } | |
107 return false; | |
108 } | |
109 | |
110 size_t ParMarkBitMap::live_words_in_range(HeapWord* beg_addr, oop end_obj) const | |
111 { | |
112 assert(beg_addr <= (HeapWord*)end_obj, "bad range"); | |
113 assert(is_marked(end_obj), "end_obj must be live"); | |
114 | |
115 idx_t live_bits = 0; | |
116 | |
117 // The bitmap routines require the right boundary to be word-aligned. | |
118 const idx_t end_bit = addr_to_bit((HeapWord*)end_obj); | |
119 const idx_t range_end = BitMap::word_align_up(end_bit); | |
120 | |
121 idx_t beg_bit = find_obj_beg(addr_to_bit(beg_addr), range_end); | |
122 while (beg_bit < end_bit) { | |
123 idx_t tmp_end = find_obj_end(beg_bit, range_end); | |
124 assert(tmp_end < end_bit, "missing end bit"); | |
125 live_bits += tmp_end - beg_bit + 1; | |
126 beg_bit = find_obj_beg(tmp_end + 1, range_end); | |
127 } | |
128 return bits_to_words(live_bits); | |
129 } | |
130 | |
131 ParMarkBitMap::IterationStatus | |
132 ParMarkBitMap::iterate(ParMarkBitMapClosure* live_closure, | |
133 idx_t range_beg, idx_t range_end) const | |
134 { | |
135 DEBUG_ONLY(verify_bit(range_beg);) | |
136 DEBUG_ONLY(verify_bit(range_end);) | |
137 assert(range_beg <= range_end, "live range invalid"); | |
138 | |
139 // The bitmap routines require the right boundary to be word-aligned. | |
140 const idx_t search_end = BitMap::word_align_up(range_end); | |
141 | |
142 idx_t cur_beg = find_obj_beg(range_beg, search_end); | |
143 while (cur_beg < range_end) { | |
144 const idx_t cur_end = find_obj_end(cur_beg, search_end); | |
145 if (cur_end >= range_end) { | |
146 // The obj ends outside the range. | |
147 live_closure->set_source(bit_to_addr(cur_beg)); | |
148 return incomplete; | |
149 } | |
150 | |
151 const size_t size = obj_size(cur_beg, cur_end); | |
152 IterationStatus status = live_closure->do_addr(bit_to_addr(cur_beg), size); | |
153 if (status != incomplete) { | |
154 assert(status == would_overflow || status == full, "sanity"); | |
155 return status; | |
156 } | |
157 | |
158 // Successfully processed the object; look for the next object. | |
159 cur_beg = find_obj_beg(cur_end + 1, search_end); | |
160 } | |
161 | |
162 live_closure->set_source(bit_to_addr(range_end)); | |
163 return complete; | |
164 } | |
165 | |
166 ParMarkBitMap::IterationStatus | |
167 ParMarkBitMap::iterate(ParMarkBitMapClosure* live_closure, | |
168 ParMarkBitMapClosure* dead_closure, | |
169 idx_t range_beg, idx_t range_end, | |
170 idx_t dead_range_end) const | |
171 { | |
172 DEBUG_ONLY(verify_bit(range_beg);) | |
173 DEBUG_ONLY(verify_bit(range_end);) | |
174 DEBUG_ONLY(verify_bit(dead_range_end);) | |
175 assert(range_beg <= range_end, "live range invalid"); | |
176 assert(range_end <= dead_range_end, "dead range invalid"); | |
177 | |
178 // The bitmap routines require the right boundary to be word-aligned. | |
179 const idx_t live_search_end = BitMap::word_align_up(range_end); | |
180 const idx_t dead_search_end = BitMap::word_align_up(dead_range_end); | |
181 | |
182 idx_t cur_beg = range_beg; | |
183 if (range_beg < range_end && is_unmarked(range_beg)) { | |
184 // The range starts with dead space. Look for the next object, then fill. | |
185 cur_beg = find_obj_beg(range_beg + 1, dead_search_end); | |
186 const idx_t dead_space_end = MIN2(cur_beg - 1, dead_range_end - 1); | |
187 const size_t size = obj_size(range_beg, dead_space_end); | |
188 dead_closure->do_addr(bit_to_addr(range_beg), size); | |
189 } | |
190 | |
191 while (cur_beg < range_end) { | |
192 const idx_t cur_end = find_obj_end(cur_beg, live_search_end); | |
193 if (cur_end >= range_end) { | |
194 // The obj ends outside the range. | |
195 live_closure->set_source(bit_to_addr(cur_beg)); | |
196 return incomplete; | |
197 } | |
198 | |
199 const size_t size = obj_size(cur_beg, cur_end); | |
200 IterationStatus status = live_closure->do_addr(bit_to_addr(cur_beg), size); | |
201 if (status != incomplete) { | |
202 assert(status == would_overflow || status == full, "sanity"); | |
203 return status; | |
204 } | |
205 | |
206 // Look for the start of the next object. | |
207 const idx_t dead_space_beg = cur_end + 1; | |
208 cur_beg = find_obj_beg(dead_space_beg, dead_search_end); | |
209 if (cur_beg > dead_space_beg) { | |
210 // Found dead space; compute the size and invoke the dead closure. | |
211 const idx_t dead_space_end = MIN2(cur_beg - 1, dead_range_end - 1); | |
212 const size_t size = obj_size(dead_space_beg, dead_space_end); | |
213 dead_closure->do_addr(bit_to_addr(dead_space_beg), size); | |
214 } | |
215 } | |
216 | |
217 live_closure->set_source(bit_to_addr(range_end)); | |
218 return complete; | |
219 } | |
220 | |
221 #ifdef ASSERT | |
222 void ParMarkBitMap::verify_clear() const | |
223 { | |
224 const idx_t* const beg = (const idx_t*)_virtual_space->committed_low_addr(); | |
225 const idx_t* const end = (const idx_t*)_virtual_space->committed_high_addr(); | |
226 for (const idx_t* p = beg; p < end; ++p) { | |
227 assert(*p == 0, "bitmap not clear"); | |
228 } | |
229 } | |
230 #endif // #ifdef ASSERT |