1 /* 2 * Copyright (c) 2001, 2015, 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_SHARED_IMMUTABLESPACE_HPP 26 #define SHARE_VM_GC_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_SHARED_IMMUTABLESPACE_HPP