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annotate src/share/vm/gc_implementation/parallelScavenge/adjoiningVirtualSpaces.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 |
children | db8a7163c682 |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2003, 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. | |
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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). | |
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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/adjoiningVirtualSpaces.hpp" | |
27 #include "runtime/java.hpp" | |
0 | 28 |
29 AdjoiningVirtualSpaces::AdjoiningVirtualSpaces(ReservedSpace rs, | |
30 size_t min_low_byte_size, | |
31 size_t min_high_byte_size, | |
32 size_t alignment) : | |
33 _reserved_space(rs), _min_low_byte_size(min_low_byte_size), | |
34 _min_high_byte_size(min_high_byte_size), _low(0), _high(0), | |
35 _alignment(alignment) {} | |
36 | |
37 // The maximum byte sizes are for the initial layout of the | |
38 // virtual spaces and are not the limit on the maximum bytes sizes. | |
39 void AdjoiningVirtualSpaces::initialize(size_t max_low_byte_size, | |
40 size_t init_low_byte_size, | |
41 size_t init_high_byte_size) { | |
42 | |
43 // The reserved spaces for the two parts of the virtual space. | |
44 ReservedSpace old_rs = _reserved_space.first_part(max_low_byte_size); | |
45 ReservedSpace young_rs = _reserved_space.last_part(max_low_byte_size); | |
46 | |
47 _low = new PSVirtualSpace(old_rs, alignment()); | |
48 if (!_low->expand_by(init_low_byte_size)) { | |
49 vm_exit_during_initialization("Could not reserve enough space for " | |
50 "object heap"); | |
51 } | |
52 | |
53 _high = new PSVirtualSpaceHighToLow(young_rs, alignment()); | |
54 if (!_high->expand_by(init_high_byte_size)) { | |
55 vm_exit_during_initialization("Could not reserve enough space for " | |
56 "object heap"); | |
57 } | |
58 } | |
59 | |
60 bool AdjoiningVirtualSpaces::adjust_boundary_up(size_t change_in_bytes) { | |
61 assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check"); | |
62 size_t actual_change = low()->expand_into(high(), change_in_bytes); | |
63 return actual_change != 0; | |
64 } | |
65 | |
66 bool AdjoiningVirtualSpaces::adjust_boundary_down(size_t change_in_bytes) { | |
67 assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check"); | |
68 size_t actual_change = high()->expand_into(low(), change_in_bytes); | |
69 return actual_change != 0; | |
70 } |