hotspot/src/share/vm/gc_implementation/g1/sparsePRT.hpp
author tonyp
Fri, 15 Oct 2010 17:26:56 -0400
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child 6983 a8c50cedbce9
permissions -rw-r--r--
6992189: G1: inconsistent base used in sparse rem set iterator Summary: The remembered set iterator for sparse tables incorrectly assumes that index 0 corresponds to the bottom of the heap, not address 0 as it is the case. Reviewed-by: ysr, jmasa
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/*
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 * Copyright (c) 2001, 2009, 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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// Sparse remembered set for a heap region (the "owning" region).  Maps
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// indices of other regions to short sequences of cards in the other region
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// that might contain pointers into the owner region.
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// These tables only expand while they are accessed in parallel --
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// deletions may be done in single-threaded code.  This allows us to allow
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// unsynchronized reads/iterations, as long as expansions caused by
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// insertions only enqueue old versions for deletions, but do not delete
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// old versions synchronously.
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class SparsePRTEntry: public CHeapObj {
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public:
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  enum SomePublicConstants {
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    NullEntry     = -1,
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    UnrollFactor  =  4
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  };
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private:
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  RegionIdx_t _region_ind;
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  int         _next_index;
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  CardIdx_t   _cards[1];
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  // WARNING: Don't put any data members beyond this line. Card array has, in fact, variable length.
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  // It should always be the last data member.
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  // Returns the size of the entry, used for entry allocation.
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  static size_t size() { return sizeof(SparsePRTEntry) + sizeof(CardIdx_t) * (cards_num() - 1); }
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  // Returns the size of the card array.
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  static int cards_num() {
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    // The number of cards should be a multiple of 4, because that's our current
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    // unrolling factor.
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    static const int s = MAX2<int>(G1RSetSparseRegionEntries & ~(UnrollFactor - 1), UnrollFactor);
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    return s;
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  }
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  // Set the region_ind to the given value, and delete all cards.
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  inline void init(RegionIdx_t region_ind);
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  RegionIdx_t r_ind() const { return _region_ind; }
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  bool valid_entry() const { return r_ind() >= 0; }
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  void set_r_ind(RegionIdx_t rind) { _region_ind = rind; }
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  int next_index() const { return _next_index; }
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  int* next_index_addr() { return &_next_index; }
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  void set_next_index(int ni) { _next_index = ni; }
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  // Returns "true" iff the entry contains the given card index.
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  inline bool contains_card(CardIdx_t card_index) const;
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  // Returns the number of non-NULL card entries.
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  inline int num_valid_cards() const;
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  // Requires that the entry not contain the given card index.  If there is
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  // space available, add the given card index to the entry and return
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  // "true"; otherwise, return "false" to indicate that the entry is full.
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  enum AddCardResult {
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    overflow,
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    found,
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    added
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  };
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  inline AddCardResult add_card(CardIdx_t card_index);
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  // Copy the current entry's cards into "cards".
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  inline void copy_cards(CardIdx_t* cards) const;
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  // Copy the current entry's cards into the "_card" array of "e."
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  inline void copy_cards(SparsePRTEntry* e) const;
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  inline CardIdx_t card(int i) const { return _cards[i]; }
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};
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class RSHashTable : public CHeapObj {
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  friend class RSHashTableIter;
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  enum SomePrivateConstants {
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    NullEntry = -1
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  };
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  size_t _capacity;
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  size_t _capacity_mask;
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  size_t _occupied_entries;
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  size_t _occupied_cards;
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  SparsePRTEntry* _entries;
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  int* _buckets;
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  int  _free_region;
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  int  _free_list;
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  // Requires that the caller hold a lock preventing parallel modifying
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  // operations, and that the the table be less than completely full.  If
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  // an entry for "region_ind" is already in the table, finds it and
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  // returns its address; otherwise returns "NULL."
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  SparsePRTEntry* entry_for_region_ind(RegionIdx_t region_ind) const;
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  // Requires that the caller hold a lock preventing parallel modifying
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  // operations, and that the the table be less than completely full.  If
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  // an entry for "region_ind" is already in the table, finds it and
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  // returns its address; otherwise allocates, initializes, inserts and
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  // returns a new entry for "region_ind".
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  SparsePRTEntry* entry_for_region_ind_create(RegionIdx_t region_ind);
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  // Returns the index of the next free entry in "_entries".
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  int alloc_entry();
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  // Declares the entry "fi" to be free.  (It must have already been
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  // deleted from any bucket lists.
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  void free_entry(int fi);
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  RSHashTable(size_t capacity);
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  ~RSHashTable();
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  // Attempts to ensure that the given card_index in the given region is in
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  // the sparse table.  If successful (because the card was already
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  // present, or because it was successfullly added) returns "true".
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  // Otherwise, returns "false" to indicate that the addition would
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  // overflow the entry for the region.  The caller must transfer these
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  // entries to a larger-capacity representation.
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  bool add_card(RegionIdx_t region_id, CardIdx_t card_index);
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  bool get_cards(RegionIdx_t region_id, CardIdx_t* cards);
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  bool delete_entry(RegionIdx_t region_id);
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  bool contains_card(RegionIdx_t region_id, CardIdx_t card_index) const;
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  void add_entry(SparsePRTEntry* e);
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  SparsePRTEntry* get_entry(RegionIdx_t region_id);
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  void clear();
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  size_t capacity() const      { return _capacity;       }
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  size_t capacity_mask() const { return _capacity_mask;  }
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  size_t occupied_entries() const { return _occupied_entries; }
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  size_t occupied_cards() const   { return _occupied_cards;   }
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  size_t mem_size() const;
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  SparsePRTEntry* entry(int i) const { return (SparsePRTEntry*)((char*)_entries + SparsePRTEntry::size() * i); }
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  void print();
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};
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// ValueObj because will be embedded in HRRS iterator.
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class RSHashTableIter VALUE_OBJ_CLASS_SPEC {
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  int _tbl_ind;         // [-1, 0.._rsht->_capacity)
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  int _bl_ind;          // [-1, 0.._rsht->_capacity)
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  short _card_ind;      // [0..SparsePRTEntry::cards_num())
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  RSHashTable* _rsht;
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  // If the bucket list pointed to by _bl_ind contains a card, sets
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  // _bl_ind to the index of that entry, and returns the card.
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  // Otherwise, returns SparseEntry::NullEntry.
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  CardIdx_t find_first_card_in_list();
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  // Computes the proper card index for the card whose offset in the
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  // current region (as indicated by _bl_ind) is "ci".
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  // This is subject to errors when there is iteration concurrent with
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  // modification, but these errors should be benign.
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  size_t compute_card_ind(CardIdx_t ci);
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public:
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  RSHashTableIter() :
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    _tbl_ind(RSHashTable::NullEntry),
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    _bl_ind(RSHashTable::NullEntry),
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    _card_ind((SparsePRTEntry::cards_num() - 1)),
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    _rsht(NULL) {}
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  void init(RSHashTable* rsht) {
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    _rsht = rsht;
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    _tbl_ind = -1; // So that first increment gets to 0.
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    _bl_ind = RSHashTable::NullEntry;
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    _card_ind = (SparsePRTEntry::cards_num() - 1);
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  }
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  bool has_next(size_t& card_index);
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};
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// Concurrent accesss to a SparsePRT must be serialized by some external
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// mutex.
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class SparsePRTIter;
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class SparsePRT VALUE_OBJ_CLASS_SPEC {
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  //  Iterations are done on the _cur hash table, since they only need to
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  //  see entries visible at the start of a collection pause.
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  //  All other operations are done using the _next hash table.
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  RSHashTable* _cur;
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  RSHashTable* _next;
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  HeapRegion* _hr;
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  enum SomeAdditionalPrivateConstants {
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    InitialCapacity = 16
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  };
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  void expand();
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  bool _expanded;
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  bool expanded() { return _expanded; }
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  void set_expanded(bool b) { _expanded = b; }
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  SparsePRT* _next_expanded;
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  SparsePRT* next_expanded() { return _next_expanded; }
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  void set_next_expanded(SparsePRT* nxt) { _next_expanded = nxt; }
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  static SparsePRT* _head_expanded_list;
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public:
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  SparsePRT(HeapRegion* hr);
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  ~SparsePRT();
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  size_t occupied() const { return _next->occupied_cards(); }
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  size_t mem_size() const;
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  // Attempts to ensure that the given card_index in the given region is in
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  // the sparse table.  If successful (because the card was already
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  // present, or because it was successfullly added) returns "true".
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  // Otherwise, returns "false" to indicate that the addition would
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  // overflow the entry for the region.  The caller must transfer these
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  // entries to a larger-capacity representation.
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  bool add_card(RegionIdx_t region_id, CardIdx_t card_index);
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  // If the table hold an entry for "region_ind",  Copies its
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  // cards into "cards", which must be an array of length at least
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  // "SparePRTEntry::cards_num()", and returns "true"; otherwise,
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  // returns "false".
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  bool get_cards(RegionIdx_t region_ind, CardIdx_t* cards);
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  // Return the pointer to the entry associated with the given region.
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  SparsePRTEntry* get_entry(RegionIdx_t region_ind);
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  // If there is an entry for "region_ind", removes it and return "true";
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  // otherwise returns "false."
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  bool delete_entry(RegionIdx_t region_ind);
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  // Clear the table, and reinitialize to initial capacity.
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  void clear();
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  // Ensure that "_cur" and "_next" point to the same table.
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  void cleanup();
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  // Clean up all tables on the expanded list.  Called single threaded.
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  static void cleanup_all();
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  RSHashTable* cur() const { return _cur; }
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  void init_iterator(SparsePRTIter* sprt_iter);
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  static void add_to_expanded_list(SparsePRT* sprt);
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  static SparsePRT* get_from_expanded_list();
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  bool contains_card(RegionIdx_t region_id, CardIdx_t card_index) const {
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    return _next->contains_card(region_id, card_index);
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  }
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};
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class SparsePRTIter: public RSHashTableIter {
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  SparsePRTIter() : RSHashTableIter() { }
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  void init(const SparsePRT* sprt) {
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    RSHashTableIter::init(sprt->cur());
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  }
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  bool has_next(size_t& card_index) {
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    return RSHashTableIter::has_next(card_index);
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  }
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};