Mercurial > hg > graal-compiler
view src/share/vm/gc_implementation/shared/immutableSpace.hpp @ 11001:c52abc8a0b08
8010124: JVM_GetClassContext: use GrowableArray instead of KlassLink
Summary: replace linked data structure with array (performance)
Reviewed-by: kvn
Contributed-by: christian.thalinger@oracle.com, david.r.chase@oracle.com
author | drchase |
---|---|
date | Thu, 13 Jun 2013 15:39:47 -0400 |
parents | da91efe96a93 |
children |
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/* * Copyright (c) 2001, 2012, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_IMMUTABLESPACE_HPP #define SHARE_VM_GC_IMPLEMENTATION_SHARED_IMMUTABLESPACE_HPP #include "memory/iterator.hpp" // 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<mtGC> { 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()); } virtual size_t capacity_in_words(Thread*) const { return capacity_in_words(); } // Iteration. virtual void oop_iterate(ExtendedOopClosure* cl); virtual void object_iterate(ObjectClosure* cl); // Debugging virtual void print() const PRODUCT_RETURN; virtual void print_short() const PRODUCT_RETURN; virtual void verify(); }; #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_IMMUTABLESPACE_HPP