hotspot/src/share/vm/gc_implementation/g1/heapRegionSeq.hpp
author jwilhelm
Thu, 03 Oct 2013 21:36:29 +0200
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parent 20083 df032615dd00
child 22234 da823d78ad65
permissions -rw-r--r--
8025852: Remove unnecessary setters in collector policy classes Summary: Use instance variables directly within the collector policy classes and remove unused setters. Reviewed-by: tschatzl, jcoomes
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/*
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 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_HPP
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#define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_HPP
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#include "gc_implementation/g1/g1BiasedArray.hpp"
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class HeapRegion;
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class HeapRegionClosure;
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class FreeRegionList;
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class G1HeapRegionTable : public G1BiasedMappedArray<HeapRegion*> {
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 protected:
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   virtual HeapRegion* default_value() const { return NULL; }
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};
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// This class keeps track of the region metadata (i.e., HeapRegion
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// instances). They are kept in the _regions array in address
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// order. A region's index in the array corresponds to its index in
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// the heap (i.e., 0 is the region at the bottom of the heap, 1 is
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// the one after it, etc.). Two regions that are consecutive in the
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// array should also be adjacent in the address space (i.e.,
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// region(i).end() == region(i+1).bottom().
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//
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// We create a HeapRegion when we commit the region's address space
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// for the first time. When we uncommit the address space of a
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// region we retain the HeapRegion to be able to re-use it in the
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// future (in case we recommit it).
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//
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// We keep track of three lengths:
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//
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// * _committed_length (returned by length()) is the number of currently
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//   committed regions.
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// * _allocated_length (not exposed outside this class) is the
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//   number of regions for which we have HeapRegions.
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// * max_length() returns the maximum number of regions the heap can have.
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//
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// and maintain that: _committed_length <= _allocated_length <= max_length()
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class HeapRegionSeq: public CHeapObj<mtGC> {
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  friend class VMStructs;
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  G1HeapRegionTable _regions;
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  // The number of regions committed in the heap.
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  uint _committed_length;
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  // A hint for which index to start searching from for humongous
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  // allocations.
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  uint _next_search_index;
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  // The number of regions for which we have allocated HeapRegions for.
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  uint _allocated_length;
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  // Find a contiguous set of empty regions of length num, starting
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  // from the given index.
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  uint find_contiguous_from(uint from, uint num);
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  void increment_allocated_length() {
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    assert(_allocated_length < max_length(), "pre-condition");
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    _allocated_length++;
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  }
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  void increment_length() {
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    assert(length() < max_length(), "pre-condition");
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    _committed_length++;
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  }
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  void decrement_length() {
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    assert(length() > 0, "pre-condition");
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    _committed_length--;
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  }
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  HeapWord* heap_bottom() const { return _regions.bottom_address_mapped(); }
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  HeapWord* heap_end() const {return _regions.end_address_mapped(); }
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 public:
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  // Empty contructor, we'll initialize it with the initialize() method.
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  HeapRegionSeq() : _regions(), _committed_length(0), _next_search_index(0), _allocated_length(0) { }
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  void initialize(HeapWord* bottom, HeapWord* end);
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  // Return the HeapRegion at the given index. Assume that the index
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  // is valid.
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  inline HeapRegion* at(uint index) const;
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  // If addr is within the committed space return its corresponding
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  // HeapRegion, otherwise return NULL.
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  inline HeapRegion* addr_to_region(HeapWord* addr) const;
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  // Return the HeapRegion that corresponds to the given
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  // address. Assume the address is valid.
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  inline HeapRegion* addr_to_region_unsafe(HeapWord* addr) const;
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  // Return the number of regions that have been committed in the heap.
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  uint length() const { return _committed_length; }
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  // Return the maximum number of regions in the heap.
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  uint max_length() const { return (uint)_regions.length(); }
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  // Expand the sequence to reflect that the heap has grown from
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  // old_end to new_end. Either create new HeapRegions, or re-use
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  // existing ones, and return them in the given list. Returns the
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  // memory region that covers the newly-created regions. If a
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  // HeapRegion allocation fails, the result memory region might be
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  // smaller than the desired one.
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  MemRegion expand_by(HeapWord* old_end, HeapWord* new_end,
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                      FreeRegionList* list);
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  // Return the number of contiguous regions at the end of the sequence
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  // that are available for allocation.
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  uint free_suffix();
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  // Find a contiguous set of empty regions of length num and return
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  // the index of the first region or G1_NULL_HRS_INDEX if the
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  // search was unsuccessful.
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  uint find_contiguous(uint num);
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  // Apply blk->doHeapRegion() on all committed regions in address order,
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  // terminating the iteration early if doHeapRegion() returns true.
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  void iterate(HeapRegionClosure* blk) const;
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  // As above, but start the iteration from hr and loop around. If hr
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  // is NULL, we start from the first region in the heap.
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  void iterate_from(HeapRegion* hr, HeapRegionClosure* blk) const;
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  // Tag as uncommitted as many regions that are completely free as
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  // possible, up to num_regions_to_remove, from the suffix of the committed
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  // sequence. Return the actual number of removed regions.
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  uint shrink_by(uint num_regions_to_remove);
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  // Do some sanity checking.
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  void verify_optional() PRODUCT_RETURN;
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};
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#endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_HPP