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1 /*
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2 * Copyright 2003-2005 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 # include "incls/_precompiled.incl"
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26 # include "incls/_adjoiningVirtualSpaces.cpp.incl"
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27
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28 AdjoiningVirtualSpaces::AdjoiningVirtualSpaces(ReservedSpace rs,
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29 size_t min_low_byte_size,
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30 size_t min_high_byte_size,
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31 size_t alignment) :
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32 _reserved_space(rs), _min_low_byte_size(min_low_byte_size),
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33 _min_high_byte_size(min_high_byte_size), _low(0), _high(0),
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34 _alignment(alignment) {}
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35
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36 // The maximum byte sizes are for the initial layout of the
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37 // virtual spaces and are not the limit on the maximum bytes sizes.
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38 void AdjoiningVirtualSpaces::initialize(size_t max_low_byte_size,
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39 size_t init_low_byte_size,
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40 size_t init_high_byte_size) {
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41
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42 // The reserved spaces for the two parts of the virtual space.
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43 ReservedSpace old_rs = _reserved_space.first_part(max_low_byte_size);
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44 ReservedSpace young_rs = _reserved_space.last_part(max_low_byte_size);
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45
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46 _low = new PSVirtualSpace(old_rs, alignment());
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47 if (!_low->expand_by(init_low_byte_size)) {
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48 vm_exit_during_initialization("Could not reserve enough space for "
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49 "object heap");
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50 }
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51
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52 _high = new PSVirtualSpaceHighToLow(young_rs, alignment());
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53 if (!_high->expand_by(init_high_byte_size)) {
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54 vm_exit_during_initialization("Could not reserve enough space for "
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55 "object heap");
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56 }
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57 }
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58
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59 bool AdjoiningVirtualSpaces::adjust_boundary_up(size_t change_in_bytes) {
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60 assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check");
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61 size_t actual_change = low()->expand_into(high(), change_in_bytes);
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62 return actual_change != 0;
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63 }
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64
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65 bool AdjoiningVirtualSpaces::adjust_boundary_down(size_t change_in_bytes) {
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66 assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check");
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67 size_t actual_change = high()->expand_into(low(), change_in_bytes);
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68 return actual_change != 0;
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69 }
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