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/*
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* Copyright 2001-2006 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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// An ImmutableSpace is a viewport into a contiguous range
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// (or subrange) of previously allocated objects.
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// Invariant: bottom() and end() are on page_size boundaries and
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// bottom() <= end()
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class ImmutableSpace: public CHeapObj {
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friend class VMStructs;
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protected:
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HeapWord* _bottom;
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HeapWord* _end;
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public:
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ImmutableSpace() { _bottom = NULL; _end = NULL; }
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HeapWord* bottom() const { return _bottom; }
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HeapWord* end() const { return _end; }
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MemRegion region() const { return MemRegion(bottom(), end()); }
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// Initialization
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void initialize(MemRegion mr);
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bool contains(const void* p) const { return _bottom <= p && p < _end; }
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// Size computations. Sizes are in bytes.
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size_t capacity_in_bytes() const { return capacity_in_words() * HeapWordSize; }
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// Size computations. Sizes are in heapwords.
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size_t capacity_in_words() const { return pointer_delta(end(), bottom()); }
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// Iteration.
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virtual void oop_iterate(OopClosure* cl);
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virtual void object_iterate(ObjectClosure* cl);
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// Debugging
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virtual void print() const PRODUCT_RETURN;
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virtual void print_short() const PRODUCT_RETURN;
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virtual void verify(bool allow_dirty) const;
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};
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