1 /* 2 * Copyright (c) 2001, 2008, 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 // An ImmutableSpace is a viewport into a contiguous range 26 // (or subrange) of previously allocated objects. 27 28 // Invariant: bottom() and end() are on page_size boundaries and 29 // bottom() <= end() 30 31 class ImmutableSpace: public CHeapObj { 32 friend class VMStructs; 33 protected: 34 HeapWord* _bottom; 35 HeapWord* _end; 36 37 public: 38 ImmutableSpace() { _bottom = NULL; _end = NULL; } 39 HeapWord* bottom() const { return _bottom; } 40 HeapWord* end() const { return _end; } 41 42 MemRegion region() const { return MemRegion(bottom(), end()); } 43 44 // Initialization 45 void initialize(MemRegion mr); 46 47 bool contains(const void* p) const { return _bottom <= p && p < _end; } 48 49 // Size computations. Sizes are in bytes. 50 size_t capacity_in_bytes() const { return capacity_in_words() * HeapWordSize; } 51 52 // Size computations. Sizes are in heapwords. 53 size_t capacity_in_words() const { return pointer_delta(end(), bottom()); } 54 virtual size_t capacity_in_words(Thread*) const { return capacity_in_words(); } 55 56 // Iteration. 57 virtual void oop_iterate(OopClosure* cl); 58 virtual void object_iterate(ObjectClosure* cl); 59 60 // Debugging 61 virtual void print() const PRODUCT_RETURN; 62 virtual void print_short() const PRODUCT_RETURN; 63 virtual void verify(bool allow_dirty); 64 };