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1 /*
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2 * Copyright 2001-2006 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 // An ImmutableSpace is a viewport into a contiguous range
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26 // (or subrange) of previously allocated objects.
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27
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28 // Invariant: bottom() and end() are on page_size boundaries and
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29 // bottom() <= end()
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30
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31 class ImmutableSpace: public CHeapObj {
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32 friend class VMStructs;
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33 protected:
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34 HeapWord* _bottom;
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35 HeapWord* _end;
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36
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37 public:
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38 ImmutableSpace() { _bottom = NULL; _end = NULL; }
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39 HeapWord* bottom() const { return _bottom; }
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40 HeapWord* end() const { return _end; }
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41
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42 MemRegion region() const { return MemRegion(bottom(), end()); }
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43
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44 // Initialization
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45 void initialize(MemRegion mr);
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46
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47 bool contains(const void* p) const { return _bottom <= p && p < _end; }
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48
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49 // Size computations. Sizes are in bytes.
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50 size_t capacity_in_bytes() const { return capacity_in_words() * HeapWordSize; }
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51
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52 // Size computations. Sizes are in heapwords.
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53 size_t capacity_in_words() const { return pointer_delta(end(), bottom()); }
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54
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55 // Iteration.
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56 virtual void oop_iterate(OopClosure* cl);
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57 virtual void object_iterate(ObjectClosure* cl);
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58
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59 // Debugging
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60 virtual void print() const PRODUCT_RETURN;
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61 virtual void print_short() const PRODUCT_RETURN;
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62 virtual void verify(bool allow_dirty) const;
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63 };
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