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