Thu, 05 Jun 2008 15:57:56 -0700
6711316: Open source the Garbage-First garbage collector
Summary: First mercurial integration of the code for the Garbage-First garbage collector.
Reviewed-by: apetrusenko, iveresov, jmasa, sgoldman, tonyp, ysr
duke@435 | 1 | /* |
duke@435 | 2 | * Copyright 2001-2006 Sun Microsystems, Inc. All Rights Reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
duke@435 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
duke@435 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
duke@435 | 21 | * have any questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
duke@435 | 25 | // An ImmutableSpace is a viewport into a contiguous range |
duke@435 | 26 | // (or subrange) of previously allocated objects. |
duke@435 | 27 | |
duke@435 | 28 | // Invariant: bottom() and end() are on page_size boundaries and |
duke@435 | 29 | // bottom() <= end() |
duke@435 | 30 | |
duke@435 | 31 | class ImmutableSpace: public CHeapObj { |
duke@435 | 32 | friend class VMStructs; |
duke@435 | 33 | protected: |
duke@435 | 34 | HeapWord* _bottom; |
duke@435 | 35 | HeapWord* _end; |
duke@435 | 36 | |
duke@435 | 37 | public: |
duke@435 | 38 | ImmutableSpace() { _bottom = NULL; _end = NULL; } |
duke@435 | 39 | HeapWord* bottom() const { return _bottom; } |
duke@435 | 40 | HeapWord* end() const { return _end; } |
duke@435 | 41 | |
duke@435 | 42 | MemRegion region() const { return MemRegion(bottom(), end()); } |
duke@435 | 43 | |
duke@435 | 44 | // Initialization |
duke@435 | 45 | void initialize(MemRegion mr); |
duke@435 | 46 | |
duke@435 | 47 | bool contains(const void* p) const { return _bottom <= p && p < _end; } |
duke@435 | 48 | |
duke@435 | 49 | // Size computations. Sizes are in bytes. |
duke@435 | 50 | size_t capacity_in_bytes() const { return capacity_in_words() * HeapWordSize; } |
duke@435 | 51 | |
duke@435 | 52 | // Size computations. Sizes are in heapwords. |
duke@435 | 53 | size_t capacity_in_words() const { return pointer_delta(end(), bottom()); } |
duke@435 | 54 | |
duke@435 | 55 | // Iteration. |
duke@435 | 56 | virtual void oop_iterate(OopClosure* cl); |
duke@435 | 57 | virtual void object_iterate(ObjectClosure* cl); |
duke@435 | 58 | |
duke@435 | 59 | // Debugging |
duke@435 | 60 | virtual void print() const PRODUCT_RETURN; |
duke@435 | 61 | virtual void print_short() const PRODUCT_RETURN; |
duke@435 | 62 | virtual void verify(bool allow_dirty) const; |
duke@435 | 63 | }; |