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This is the verbatim text of the mapTable.h include file.
/* Sun-$Revision: 23.4 $ */

/* Copyright 1992-9 Sun Microsystems, Inc. and Stanford University.
   See the LICENSE file for license information. */

# pragma interface

// The map table is used to canonicalize maps (i.e. all objects having the
// same structure have the same map, independently of how they arrived at
// the current structure.)

const int32 mapTableSize = 20011;

class mapTable : public CHeapObj {

  bool   maps_are_canonical_in_snapshot;
  nmln   buckets[mapTableSize];

  int32           hash(int32 length, VtblPtr_t vtbl_value, slotDesc* slot);
  nmln*           bucketFor(slotsMapDeps* m);
  void            add(slotsMapDeps* m);
  slotsMapDeps*   equivalent_map(slotsMapDeps* m);
  void            verify_chain(nmln* head);
  void            print_bucket(int32 bucket_num);
  void            print_histogram();


  bool get_maps_are_canonical() {return CanonicalizeMaps;};
  bool set_maps_are_canonical(bool f);
  bool get_maps_are_canonical_in_snapshot() {
           return maps_are_canonical_in_snapshot; }
  void set_maps_are_canonical_in_snapshot(bool f);

  slotsMapDeps*  canonical_map(slotsMapDeps* m);
  // to speed reading in snapshots, avoid probe
  void add_map_from_snapshot(slotsMapDeps* m);
  void verify();
  void verify_map(slotsMapDeps* m);
  bool contains(nmln* p) { // used by nmln for verification
    return (p >= buckets) && (p < (buckets + mapTableSize));

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