| /* |
| * Copyright (c) 2001, 2015, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #ifndef SHARE_VM_GC_PARALLEL_IMMUTABLESPACE_HPP |
| #define SHARE_VM_GC_PARALLEL_IMMUTABLESPACE_HPP |
| |
| #include "memory/iterator.hpp" |
| |
| // 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<mtGC> { |
| 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()); } |
| virtual size_t capacity_in_words(Thread*) const { return capacity_in_words(); } |
| |
| // Iteration. |
| virtual void oop_iterate(ExtendedOopClosure* cl); |
| virtual void object_iterate(ObjectClosure* cl); |
| |
| // Debugging |
| virtual void print() const PRODUCT_RETURN; |
| virtual void print_short() const PRODUCT_RETURN; |
| virtual void verify(); |
| }; |
| |
| #endif // SHARE_VM_GC_PARALLEL_IMMUTABLESPACE_HPP |