Mercurial > hg > graal-jvmci-8
diff src/share/vm/gc_implementation/shared/immutableSpace.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | d1635bf93939 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/gc_implementation/shared/immutableSpace.hpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,63 @@ +/* + * Copyright 2001-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +// 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 { + 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()); } + + // Iteration. + virtual void oop_iterate(OopClosure* cl); + virtual void object_iterate(ObjectClosure* cl); + + // Debugging + virtual void print() const PRODUCT_RETURN; + virtual void print_short() const PRODUCT_RETURN; + virtual void verify(bool allow_dirty) const; +};