Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: src/share/vm/gc_implementation/shared/immutableSpace.hpp
src/share/vm/gc_implementation/shared/immutableSpace.hpp
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| 1 /* | |
| 2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. | |
| 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
| 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 20 * or visit www.oracle.com if you need additional information or have any | |
| 21 * questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_IMMUTABLESPACE_HPP | |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_IMMUTABLESPACE_HPP | |
| 27 | |
| 28 #include "memory/iterator.hpp" | |
| 29 | |
| 30 // An ImmutableSpace is a viewport into a contiguous range | |
| 31 // (or subrange) of previously allocated objects. | |
| 32 | |
| 33 // Invariant: bottom() and end() are on page_size boundaries and | |
| 34 // bottom() <= end() | |
| 35 | |
| 36 class ImmutableSpace: public CHeapObj<mtGC> { | |
| 37 friend class VMStructs; | |
| 38 protected: | |
| 39 HeapWord* _bottom; | |
| 40 HeapWord* _end; | |
| 41 | |
| 42 public: | |
| 43 ImmutableSpace() { _bottom = NULL; _end = NULL; } | |
| 44 HeapWord* bottom() const { return _bottom; } | |
| 45 HeapWord* end() const { return _end; } | |
| 46 | |
| 47 MemRegion region() const { return MemRegion(bottom(), end()); } | |
| 48 | |
| 49 // Initialization | |
| 50 void initialize(MemRegion mr); | |
| 51 | |
| 52 bool contains(const void* p) const { return _bottom <= p && p < _end; } | |
| 53 | |
| 54 // Size computations. Sizes are in bytes. | |
| 55 size_t capacity_in_bytes() const { return capacity_in_words() * HeapWordSize; } | |
| 56 | |
| 57 // Size computations. Sizes are in heapwords. | |
| 58 size_t capacity_in_words() const { return pointer_delta(end(), bottom()); } | |
| 59 virtual size_t capacity_in_words(Thread*) const { return capacity_in_words(); } | |
| 60 | |
| 61 // Iteration. | |
| 62 virtual void oop_iterate(ExtendedOopClosure* cl); | |
| 63 virtual void object_iterate(ObjectClosure* cl); | |
| 64 | |
| 65 // Debugging | |
| 66 virtual void print() const PRODUCT_RETURN; | |
| 67 virtual void print_short() const PRODUCT_RETURN; | |
| 68 virtual void verify(); | |
| 69 }; | |
| 70 | |
| 71 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_IMMUTABLESPACE_HPP |
