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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is mozilla.org code.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1999
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either of the GNU General Public License Version 2 or later (the "GPL"),
+ * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#ifndef _MORKMAP_
+#define _MORKMAP_ 1
+
+#ifndef _MORK_
+#include "mork.h"
+#endif
+
+#ifndef _MORKNODE_
+#include "morkNode.h"
+#endif
+
+//3456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789
+
+/* (These hash methods closely resemble those in public domain IronDoc.) */
+
+/*| Equal: equal for hash table. Note equal(a,b) implies hash(a)==hash(b).
+|*/
+typedef mork_bool (* morkMap_mEqual)
+(const morkMap* self, morkEnv* ev, const void* inKeyA, const void* inKeyB);
+
+/*| Hash: hash for hash table. Note equal(a,b) implies hash(a)==hash(b).
+|*/
+typedef mork_u4 (* morkMap_mHash)
+(const morkMap* self, morkEnv* ev, const void* inKey);
+
+/*| IsNil: whether a key slot contains a "null" value denoting "no such key".
+|*/
+typedef mork_bool (* morkMap_mIsNil)
+(const morkMap* self, morkEnv* ev, const void* inKey);
+
+/*| Note: notify regarding a refcounting change for a key or a value.
+|*/
+//typedef void (* morkMap_mNote)
+//(morkMap* self, morkEnv* ev, void* inKeyOrVal);
+
+/*| morkMapForm: slots need to initialize a new dict. (This is very similar
+**| to the config object for public domain IronDoc hash tables.)
+|*/
+class morkMapForm { // a struct of callback method pointers for morkMap
+public:
+
+ // const void* mMapForm_NilKey; // externally defined 'nil' bit pattern
+
+ // void* mMapForm_NilBuf[ 8 ]; // potential place to put NilKey
+ // If keys are no larger than 8*sizeof(void*), NilKey can be put in NilBuf.
+ // Note this should be true for all Mork subclasses, and we plan usage so.
+
+ // These three methods must always be provided, so zero will cause errors:
+
+ // morkMap_mEqual mMapForm_Equal; // for comparing two keys for identity
+ // morkMap_mHash mMapForm_Hash; // deterministic key to hash method
+ // morkMap_mIsNil mMapForm_IsNil; // to query whether a key equals 'nil'
+
+ // If any of these method slots are nonzero, then morkMap will call the
+ // appropriate one to notify dict users when a key or value is added or cut.
+ // Presumably a caller wants to know this in order to perform refcounting or
+ // some other kind of memory management. These methods are definitely only
+ // called when references to keys or values are inserted or removed, and are
+ // never called when the actual number of references does not change (such
+ // as when added keys are already present or cut keys are alreading missing).
+ //
+ // morkMap_mNote mMapForm_AddKey; // if nonzero, notify about add key
+ // morkMap_mNote mMapForm_CutKey; // if nonzero, notify about cut key
+ // morkMap_mNote mMapForm_AddVal; // if nonzero, notify about add val
+ // morkMap_mNote mMapForm_CutVal; // if nonzero, notify about cut val
+ //
+ // These note methods have been removed because it seems difficult to
+ // guarantee suitable alignment of objects passed to notification methods.
+
+ // Note dict clients should pick key and val sizes that provide whatever
+ // alignment will be required for an array of such keys and values.
+ mork_size mMapForm_KeySize; // size of every key (cannot be zero)
+ mork_size mMapForm_ValSize; // size of every val (can indeed be zero)
+
+ mork_bool mMapForm_HoldChanges; // support changes array in the map
+ mork_change mMapForm_DummyChange; // change used for false HoldChanges
+ mork_bool mMapForm_KeyIsIP; // key is mork_ip sized
+ mork_bool mMapForm_ValIsIP; // key is mork_ip sized
+};
+
+/*| morkAssoc: a canonical association slot in a morkMap. A single assoc
+**| instance does nothing except point to the next assoc in the same bucket
+**| of a hash table. Each assoc has only two interesting attributes: 1) the
+**| address of the assoc, and 2) the next assoc in a bucket's list. The assoc
+**| address is interesting because in the context of an array of such assocs,
+**| one can determine the index of a particular assoc in the array by address
+**| arithmetic, subtracting the array address from the assoc address. And the
+**| index of each assoc is the same index as the associated key and val slots
+**| in the associated arrays
+**|
+**|| Think of an assoc instance as really also containing a key slot and a val
+**| slot, where each key is mMap_Form.mMapForm_KeySize bytes in size, and
+**| each val is mMap_Form.mMapForm_ValSize in size. But the key and val
+**| slots are stored in separate arrays with indexes that are parallel to the
+**| indexes in the array of morkAssoc instances. We have taken the variable
+**| sized slots out of the morkAssoc structure, and put them into parallel
+**| arrays associated with each morkAssoc by array index. And this leaves us
+**| with only the link field to the next assoc in each assoc instance.
+|*/
+class morkAssoc {
+public:
+ morkAssoc* mAssoc_Next;
+};
+
+
+#define morkDerived_kMap /*i*/ 0x4D70 /* ascii 'Mp' */
+
+#define morkMap_kTag /*i*/ 0x6D4D6150 /* ascii 'mMaP' */
+
+/*| morkMap: a hash table based on the public domain IronDoc hash table
+**| (which is in turn rather like a similar OpenDoc hash table).
+|*/
+class morkMap : public morkNode {
+
+// public: // slots inherited from morkNode (meant to inform only)
+ // nsIMdbHeap* mNode_Heap;
+
+ // mork_base mNode_Base; // must equal morkBase_kNode
+ // mork_derived mNode_Derived; // depends on specific node subclass
+
+ // mork_access mNode_Access; // kOpen, kClosing, kShut, or kDead
+ // mork_usage mNode_Usage; // kHeap, kStack, kMember, kGlobal, kNone
+ // mork_able mNode_Mutable; // can this node be modified?
+ // mork_load mNode_Load; // is this node clean or dirty?
+
+ // mork_uses mNode_Uses; // refcount for strong refs
+ // mork_refs mNode_Refs; // refcount for strong refs + weak refs
+
+public: // state is public because the entire Mork system is private
+
+ nsIMdbHeap* mMap_Heap; // strong ref to heap allocating all space
+ mork_u4 mMap_Tag; // must equal morkMap_kTag
+
+ // When a morkMap instance is constructed, the dict form slots must be
+ // provided in order to properly configure a dict with all runtime needs:
+
+ morkMapForm mMap_Form; // construction time parameterization
+
+ // Whenever the dict changes structure in a way that would affect any
+ // iteration of the dict associations, the seed increments to show this:
+
+ mork_seed mMap_Seed; // counter for member and structural changes
+
+ // The current total assoc capacity of the dict is mMap_Slots, where
+ // mMap_Fill of these slots are actually holding content, so mMap_Fill
+ // is the actual membership count, and mMap_Slots is how larger membership
+ // can become before the hash table must grow the buffers being used.
+
+ mork_count mMap_Slots; // count of slots in the hash table
+ mork_fill mMap_Fill; // number of used slots in the hash table
+
+ // Key and value slots are bound to corresponding mMap_Assocs array slots.
+ // Instead of having a single array like this: {key,val,next}[ mMap_Slots ]
+ // we have instead three parallel arrays with essentially the same meaning:
+ // {key}[ mMap_Slots ], {val}[ mMap_Slots ], {assocs}[ mMap_Slots ]
+
+ mork_u1* mMap_Keys; // mMap_Slots * mMapForm_KeySize buffer
+ mork_u1* mMap_Vals; // mMap_Slots * mMapForm_ValSize buffer
+
+ // An assoc is "used" when it appears in a bucket's linked list of assocs.
+ // Until an assoc is used, it appears in the FreeList linked list. Every
+ // assoc that becomes used goes into the bucket determined by hashing the
+ // key associated with a new assoc. The key associated with a new assoc
+ // goes in to the slot in mMap_Keys which occupies exactly the same array
+ // index as the array index of the used assoc in the mMap_Assocs array.
+
+ morkAssoc* mMap_Assocs; // mMap_Slots * sizeof(morkAssoc) buffer
+
+ // The changes array is only needed when the
+
+ mork_change* mMap_Changes; // mMap_Slots * sizeof(mork_change) buffer
+
+ // The Buckets array need not be the same length as the Assocs array, but we
+ // usually do it that way so the average bucket depth is no more than one.
+ // (We could pick a different policy, or make it parameterizable, but that's
+ // tuning we can do some other time.)
+
+ morkAssoc** mMap_Buckets; // mMap_Slots * sizeof(morkAssoc*) buffer
+
+ // The length of the mMap_FreeList should equal (mMap_Slots - mMap_Fill).
+ // We need a free list instead of a simpler representation because assocs
+ // can be cut and returned to availability in any kind of unknown pattern.
+ // (However, when assocs are first allocated, or when the dict is grown, we
+ // know all new assocs are contiguous and can chain together adjacently.)
+
+ morkAssoc* mMap_FreeList; // list of unused mMap_Assocs array slots
+
+public: // getters (morkProbeMap compatibility)
+ mork_fill MapFill() const { return mMap_Fill; }
+
+// { ===== begin morkNode interface =====
+public: // morkNode virtual methods
+ virtual void CloseMorkNode(morkEnv* ev) override; // CloseMap() only if open
+ virtual ~morkMap(); // assert that CloseMap() executed earlier
+
+public: // morkMap construction & destruction
+ morkMap(morkEnv* ev, const morkUsage& inUsage, nsIMdbHeap* ioNodeHeap,
+ mork_size inKeySize, mork_size inValSize,
+ mork_size inSlots, nsIMdbHeap* ioSlotHeap, mork_bool inHoldChanges);
+
+ void CloseMap(morkEnv* ev); // called by
+
+public: // dynamic type identification
+ mork_bool IsMap() const
+ { return IsNode() && mNode_Derived == morkDerived_kMap; }
+// } ===== end morkNode methods =====
+
+public: // poly map hash table methods
+
+// { ===== begin morkMap poly interface =====
+ virtual mork_bool // note: equal(a,b) implies hash(a) == hash(b)
+ Equal(morkEnv* ev, const void* inKeyA, const void* inKeyB) const = 0;
+
+ virtual mork_u4 // note: equal(a,b) implies hash(a) == hash(b)
+ Hash(morkEnv* ev, const void* inKey) const = 0;
+// } ===== end morkMap poly interface =====
+
+public: // open utitity methods
+
+ mork_bool GoodMapTag() const { return mMap_Tag == morkMap_kTag; }
+ mork_bool GoodMap() const
+ { return ( IsNode() && GoodMapTag() ); }
+
+ void NewIterOutOfSyncError(morkEnv* ev);
+ void NewBadMapError(morkEnv* ev);
+ void NewSlotsUnderflowWarning(morkEnv* ev);
+ void InitMap(morkEnv* ev, mork_size inSlots);
+
+protected: // internal utitity methods
+
+ friend class morkMapIter;
+ void clear_map(morkEnv* ev, nsIMdbHeap* ioHeap);
+
+ void* alloc(morkEnv* ev, mork_size inSize);
+ void* clear_alloc(morkEnv* ev, mork_size inSize);
+
+ void push_free_assoc(morkAssoc* ioAssoc)
+ {
+ ioAssoc->mAssoc_Next = mMap_FreeList;
+ mMap_FreeList = ioAssoc;
+ }
+
+ morkAssoc* pop_free_assoc()
+ {
+ morkAssoc* assoc = mMap_FreeList;
+ if ( assoc )
+ mMap_FreeList = assoc->mAssoc_Next;
+ return assoc;
+ }
+
+ morkAssoc** find(morkEnv* ev, const void* inKey, mork_u4 inHash) const;
+
+ mork_u1* new_keys(morkEnv* ev, mork_num inSlots);
+ mork_u1* new_values(morkEnv* ev, mork_num inSlots);
+ mork_change* new_changes(morkEnv* ev, mork_num inSlots);
+ morkAssoc** new_buckets(morkEnv* ev, mork_num inSlots);
+ morkAssoc* new_assocs(morkEnv* ev, mork_num inSlots);
+ mork_bool new_arrays(morkEnv* ev, morkHashArrays* old, mork_num inSlots);
+
+ mork_bool grow(morkEnv* ev);
+
+ void get_assoc(void* outKey, void* outVal, mork_pos inPos) const;
+ void put_assoc(const void* inKey, const void* inVal, mork_pos inPos) const;
+
+public: // inlines to form slots
+ // const void* FormNilKey() const { return mMap_Form.mMapForm_NilKey; }
+
+ // morkMap_mEqual FormEqual() const { return mMap_Form.mMapForm_Equal; }
+ // morkMap_mHash FormHash() const { return mMap_Form.mMapForm_Hash; }
+ // orkMap_mIsNil FormIsNil() const { return mMap_Form.mMapForm_IsNil; }
+
+ // morkMap_mNote FormAddKey() const { return mMap_Form.mMapForm_AddKey; }
+ // morkMap_mNote FormCutKey() const { return mMap_Form.mMapForm_CutKey; }
+ // morkMap_mNote FormAddVal() const { return mMap_Form.mMapForm_AddVal; }
+ // morkMap_mNote FormCutVal() const { return mMap_Form.mMapForm_CutVal; }
+
+ mork_size FormKeySize() const { return mMap_Form.mMapForm_KeySize; }
+ mork_size FormValSize() const { return mMap_Form.mMapForm_ValSize; }
+
+ mork_bool FormKeyIsIP() const { return mMap_Form.mMapForm_KeyIsIP; }
+ mork_bool FormValIsIP() const { return mMap_Form.mMapForm_ValIsIP; }
+
+ mork_bool FormHoldChanges() const
+ { return mMap_Form.mMapForm_HoldChanges; }
+
+ mork_change* FormDummyChange()
+ { return &mMap_Form.mMapForm_DummyChange; }
+
+public: // other map methods
+
+ mork_bool Put(morkEnv* ev, const void* inKey, const void* inVal,
+ void* outKey, void* outVal, mork_change** outChange);
+
+ mork_bool Cut(morkEnv* ev, const void* inKey,
+ void* outKey, void* outVal, mork_change** outChange);
+
+ mork_bool Get(morkEnv* ev, const void* inKey,
+ void* outKey, void* outVal, mork_change** outChange);
+
+ mork_num CutAll(morkEnv* ev);
+
+private: // copying is not allowed
+ morkMap(const morkMap& other);
+ morkMap& operator=(const morkMap& other);
+
+
+public: // typesafe refcounting inlines calling inherited morkNode methods
+ static void SlotWeakMap(morkMap* me,
+ morkEnv* ev, morkMap** ioSlot)
+ { morkNode::SlotWeakNode((morkNode*) me, ev, (morkNode**) ioSlot); }
+
+ static void SlotStrongMap(morkMap* me,
+ morkEnv* ev, morkMap** ioSlot)
+ { morkNode::SlotStrongNode((morkNode*) me, ev, (morkNode**) ioSlot); }
+};
+
+/*| morkMapIter: an iterator for morkMap and subclasses. This is not a node,
+**| and expected usage is as a member of some other node subclass, such as in
+**| a cursor subclass or a thumb subclass. Also, iters might be as temp stack
+**| objects when scanning the content of a map.
+|*/
+class morkMapIter{ // iterator for hash table map
+
+protected:
+ morkMap* mMapIter_Map; // map to iterate, NOT refcounted
+ mork_seed mMapIter_Seed; // cached copy of map's seed
+
+ morkAssoc** mMapIter_Bucket; // one bucket in mMap_Buckets array
+ morkAssoc** mMapIter_AssocRef; // usually *AtRef equals Here
+ morkAssoc* mMapIter_Assoc; // the current assoc in an iteration
+ morkAssoc* mMapIter_Next; // mMapIter_Assoc->mAssoc_Next */
+
+public:
+ morkMapIter(morkEnv* ev, morkMap* ioMap);
+ void CloseMapIter(morkEnv* ev);
+
+ morkMapIter( ); // everything set to zero -- need to call InitMapIter()
+
+protected: // we want all subclasses to provide typesafe wrappers:
+
+ void InitMapIter(morkEnv* ev, morkMap* ioMap);
+
+ // The morkAssoc returned below is always either mork_change* or
+ // else nil (when there is no such assoc). We return a pointer to
+ // the change rather than a simple bool, because callers might
+ // want to access change info associated with an assoc.
+
+ mork_change* First(morkEnv* ev, void* outKey, void* outVal);
+ mork_change* Next(morkEnv* ev, void* outKey, void* outVal);
+ mork_change* Here(morkEnv* ev, void* outKey, void* outVal);
+
+ mork_change* CutHere(morkEnv* ev, void* outKey, void* outVal);
+};
+
+//3456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789
+
+#endif /* _MORKMAP_ */
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