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 /*

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  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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  * published by the Free Software Foundation.

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  * 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.

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 #ifndef SHARE_VM_LIBADT_VECTSET_HPP

 #define SHARE_VM_LIBADT_VECTSET_HPP

 #include "libadt/set.hpp"

 // Vector Sets - An Abstract Data Type

 //INTERFACE

 // These sets can grow or shrink, based on the initial size and the largest

 // element currently in them.  Slow and bulky for sparse sets, these sets

 // are super for dense sets.  They are fast and compact when dense.

 // TIME:

 // O(1) - Insert, Delete, Member, Sort

 // O(max_element) - Create, Clear, Size, Copy, Union, Intersect, Difference,

 //                  Equal, ChooseMember, Forall

 // SPACE: (max_element)/(8*sizeof(int))

 //------------------------------VectorSet--------------------------------------

 class VectorSet : public Set {

 friend class VectorSetI;        // Friendly iterator class

 protected:

   uint size;                    // Size of data IN LONGWORDS (32bits)

   uint32 *data;                 // The data, bit packed

   void slamin( const VectorSet& s );     // Initialize one set with another

   int compare(const VectorSet &s) const; // Compare set contents

   void grow(uint newsize);               // Grow vector to required bitsize

 public:

   VectorSet(Arena *arena);                      // Creates a new, empty set.

   VectorSet(const VectorSet &s) : Set(s._set_arena) {slamin(s);} // Set clone; deep-copy guts

   Set &operator =(const Set &s);                // Set clone; deep-copy guts

   VectorSet &operator =(const VectorSet &s)     // Set clone; deep-copy guts

   { if( &s != this ) { slamin(s); } return *this; }

   ~VectorSet() {}

   Set &clone(void) const { return *(new VectorSet(*this)); }

   Set &operator <<=(uint elem);          // Add member to set

   VectorSet operator << (uint elem)      // Add member to new set

   { VectorSet foo(*this); foo <<= elem; return foo; }

   Set &operator >>=(uint elem);          // Delete member from set

   VectorSet operator >> (uint elem)      // Delete member from new set

   { VectorSet foo(*this); foo >>= elem; return foo; }

   VectorSet &operator &=(const VectorSet &s); // Intersect sets into first set

   Set       &operator &=(const Set       &s); // Intersect sets into first set

   VectorSet operator & (const VectorSet &s) const

   { VectorSet foo(*this); foo &= s; return foo; }

   VectorSet &operator |=(const VectorSet &s); // Intersect sets into first set

   Set       &operator |=(const Set       &s); // Intersect sets into first set

   VectorSet operator | (const VectorSet &s) const

   { VectorSet foo(*this); foo |= s; return foo; }

   VectorSet &operator -=(const VectorSet &s); // Intersect sets into first set

   Set       &operator -=(const Set       &s); // Intersect sets into first set

   VectorSet operator - (const VectorSet &s) const

   { VectorSet foo(*this); foo -= s; return foo; }

   int operator ==(const VectorSet &s) const;  // True if sets are equal

   int operator ==(const Set       &s) const;  // True if sets are equal

   int operator < (const VectorSet &s) const;  // True if strict subset

   int operator < (const Set       &s) const;  // True if strict subset

   int operator <=(const VectorSet &s) const;  // True if subset relation holds.

   int operator <=(const Set       &s) const;  // True if subset relation holds.

   int disjoint   (const Set       &s) const;  // True if sets are disjoint

   int operator [](uint elem) const; // Test for membership

   uint getelem(void) const;         // Return a random element

   void Clear(void);                 // Clear a set

   uint Size(void) const;            // Number of elements in the Set.

   void Sort(void);                  // Sort before iterating

   int hash() const;                 // Hash function

   /* Removed for MCC BUG

      operator const VectorSet* (void) const { return this; } */

   const VectorSet *asVectorSet() const { return this; }

   // Expose internals for speed-critical fast iterators

   uint word_size() const { return size; }

   uint32 *EXPOSE() const { return data; }

   // Fast inlined "test and set".  Replaces the idiom:

   //     if( visited[idx] ) return;

   //     visited <<= idx;

   // With:

   //     if( visited.test_set(idx) ) return;

   //

   int test_set( uint elem ) {

     uint word = elem >> 5;           // Get the longword offset

     if( word >= size )               // Beyond the last?

       return test_set_grow(elem);    // Then grow; set; return 0;

     uint32 mask = 1L << (elem & 31); // Get bit mask

     uint32 datum = data[word] & mask;// Get bit

     data[word] |= mask;              // Set bit

     return datum;                    // Return bit

   }

   int test_set_grow( uint elem ) {    // Insert & return 0;

     (*this) <<= elem;                 // Insert into set

     return 0;                         // Return 0!

   }

   // Fast inlined test

   int test( uint elem ) const {

     uint word = elem >> 5;      // Get the longword offset

     if( word >= size ) return 0; // Beyond the last?

     uint32 mask = 1L << (elem & 31); // Get bit mask

     return data[word] & mask;   // Get bit

   }

   // Fast inlined set

   void set( uint elem ) {

     uint word = elem >> 5;      // Get the longword offset

     if( word >= size ) {        // Beyond the last?

       test_set_grow(elem);      // Then grow and set

     } else {

       uint32 mask = 1L << (elem & 31); // Get bit mask

       data[word] |= mask;       // Set bit

     }

   }

 private:

   friend class VSetI_;

   SetI_ *iterate(uint&) const;

 };

 //------------------------------Iteration--------------------------------------

 // Loop thru all elements of the set, setting "elem" to the element numbers

 // in random order.  Inserted or deleted elements during this operation may

 // or may not be iterated over; untouched elements will be affected once.

 // Usage:  for( VectorSetI i(s); i.test(); i++ ) { body = i.elem; }

 class VSetI_ : public SetI_ {

   friend class VectorSet;

   friend class VectorSetI;

   const VectorSet *s;

   uint i, j;

   uint32 mask;

   VSetI_(const VectorSet *vset);

   uint next(void);

   int test(void) { return i < s->size; }

 };

 class VectorSetI : public SetI {

 public:

   VectorSetI( const VectorSet *s ) : SetI(s) { }

   void operator ++(void) { elem = ((VSetI_*)impl)->next(); }

   int test(void) { return ((VSetI_*)impl)->test(); }

 };

 #endif // SHARE_VM_LIBADT_VECTSET_HPP