/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* 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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*/
#include "precompiled.hpp"
#include "libadt/vectset.hpp"
#include "memory/allocation.inline.hpp"
#include "memory/arena.hpp"
// Vector Sets - An Abstract Data Type
// BitsInByte is a lookup table which tells the number of bits that
// are in the looked-up number. It is very useful in VectorSet_Size.
uint8_t bitsInByte[BITS_IN_BYTE_ARRAY_SIZE] = {
0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4,
1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8
};
//------------------------------VectorSet--------------------------------------
// Create a new, empty Set.
VectorSet::VectorSet(Arena *arena) : Set(arena) {
size = 2; // Small initial size
data = (uint32_t *)_set_arena->Amalloc(size*sizeof(uint32_t));
data[0] = 0; // No elements
data[1] = 0;
}
//------------------------------operator=--------------------------------------
Set &VectorSet::operator = (const Set &set)
{
if( &set == this ) return *this;
FREE_FAST(data);
// The cast is a virtual function that checks that "set" is a VectorSet.
slamin(*(set.asVectorSet()));
return *this;
}
//------------------------------slamin-----------------------------------------
// Initialize one set with another. No regard is made to the existing Set.
void VectorSet::slamin(const VectorSet& s)
{
size = s.size; // Use new size
data = (uint32_t*)s._set_arena->Amalloc(size*sizeof(uint32_t)); // Make array of required size
memcpy( data, s.data, size*sizeof(uint32_t) ); // Fill the array
}
//------------------------------grow-------------------------------------------
// Expand the existing set to a bigger size
void VectorSet::grow( uint newsize )
{
newsize = (newsize+31) >> 5; // Convert to longwords
uint x = size;
while( x < newsize ) x <<= 1;
data = (uint32_t *)_set_arena->Arealloc(data, size*sizeof(uint32_t), x*sizeof(uint32_t));
memset((char *)(data + size), 0, (x - size)*sizeof(uint32_t));
size = x;
}
//------------------------------operator<<=------------------------------------
// Insert a member into an existing Set.
Set &VectorSet::operator <<= (uint elem)
{
uint word = elem >> 5; // Get the longword offset
uint32_t mask = 1L << (elem & 31); // Get bit mask
if( word >= size ) // Need to grow set?
grow(elem+1); // Then grow it
data[word] |= mask; // Set new bit
return *this;
}
//------------------------------operator>>=------------------------------------
// Delete a member from an existing Set.
Set &VectorSet::operator >>= (uint elem)
{
uint word = elem >> 5; // Get the longword offset
if( word >= size ) // Beyond the last?
return *this; // Then it's clear & return clear
uint32_t mask = 1L << (elem & 31); // Get bit mask
data[word] &= ~mask; // Clear bit
return *this;
}
//------------------------------operator&=-------------------------------------
// Intersect one set into another.
VectorSet &VectorSet::operator &= (const VectorSet &s)
{
// NOTE: The intersection is never any larger than the smallest set.
if( s.size < size ) size = s.size; // Get smaller size
uint32_t *u1 = data; // Pointer to the destination data
uint32_t *u2 = s.data; // Pointer to the source data
for( uint i=0; i<size; i++) // For data in set
*u1++ &= *u2++; // Copy and AND longwords
return *this; // Return set
}
//------------------------------operator&=-------------------------------------
Set &VectorSet::operator &= (const Set &set)
{
// The cast is a virtual function that checks that "set" is a VectorSet.
return (*this) &= *(set.asVectorSet());
}
//------------------------------operator|=-------------------------------------
// Union one set into another.
VectorSet &VectorSet::operator |= (const VectorSet &s)
{
// This many words must be unioned
uint cnt = ((size<s.size)?size:s.size);
uint32_t *u1 = data; // Pointer to the destination data
uint32_t *u2 = s.data; // Pointer to the source data
for( uint i=0; i<cnt; i++) // Copy and OR the two sets
*u1++ |= *u2++;
if( size < s.size ) { // Is set 2 larger than set 1?
// Extend result by larger set
grow(s.size*sizeof(uint32_t)*8);
memcpy(&data[cnt], u2, (s.size - cnt)*sizeof(uint32_t));
}
return *this; // Return result set
}
//------------------------------operator|=-------------------------------------
Set &VectorSet::operator |= (const Set &set)
{
// The cast is a virtual function that checks that "set" is a VectorSet.
return (*this) |= *(set.asVectorSet());
}
//------------------------------operator-=-------------------------------------
// Difference one set from another.
VectorSet &VectorSet::operator -= (const VectorSet &s)
{
// This many words must be unioned
uint cnt = ((size<s.size)?size:s.size);
uint32_t *u1 = data; // Pointer to the destination data
uint32_t *u2 = s.data; // Pointer to the source data
for( uint i=0; i<cnt; i++ ) // For data in set
*u1++ &= ~(*u2++); // A <-- A & ~B with longwords
return *this; // Return new set
}
//------------------------------operator-=-------------------------------------
Set &VectorSet::operator -= (const Set &set)
{
// The cast is a virtual function that checks that "set" is a VectorSet.
return (*this) -= *(set.asVectorSet());
}
//------------------------------compare----------------------------------------
// Compute 2 booleans: bits in A not B, bits in B not A.
// Return X0 -- A is not a subset of B
// X1 -- A is a subset of B
// 0X -- B is not a subset of A
// 1X -- B is a subset of A
int VectorSet::compare (const VectorSet &s) const
{
uint32_t *u1 = data; // Pointer to the destination data
uint32_t *u2 = s.data; // Pointer to the source data
uint32_t AnotB = 0, BnotA = 0;
// This many words must be unioned
uint cnt = ((size<s.size)?size:s.size);
// Get bits for both sets
uint i; // Exit value of loop
for( i=0; i<cnt; i++ ) { // For data in BOTH sets
uint32_t A = *u1++; // Data from one guy
uint32_t B = *u2++; // Data from other guy
AnotB |= (A & ~B); // Compute bits in A not B
BnotA |= (B & ~A); // Compute bits in B not A
}
// Get bits from bigger set
if( size < s.size ) {
for( ; i<s.size; i++ ) // For data in larger set
BnotA |= *u2++; // These bits are in B not A
} else {
for( ; i<size; i++ ) // For data in larger set
AnotB |= *u1++; // These bits are in A not B
}
// Set & return boolean flags
return ((!BnotA)<<1) + (!AnotB);
}
//------------------------------operator==-------------------------------------
// Test for set equality
int VectorSet::operator == (const VectorSet &s) const
{
return compare(s) == 3; // TRUE if A and B are mutual subsets
}
//------------------------------operator==-------------------------------------
int VectorSet::operator == (const Set &set) const
{
// The cast is a virtual function that checks that "set" is a VectorSet.
return (*this) == *(set.asVectorSet());
}
//------------------------------disjoint---------------------------------------
// Check for sets being disjoint.
int VectorSet::disjoint(const Set &set) const
{
// The cast is a virtual function that checks that "set" is a VectorSet.
const VectorSet &s = *(set.asVectorSet());
// NOTE: The intersection is never any larger than the smallest set.
uint small_size = ((size<s.size)?size:s.size);
uint32_t *u1 = data; // Pointer to the destination data
uint32_t *u2 = s.data; // Pointer to the source data
for( uint i=0; i<small_size; i++) // For data in set
if( *u1++ & *u2++ ) // If any elements in common
return 0; // Then not disjoint
return 1; // Else disjoint
}
//------------------------------operator<--------------------------------------
// Test for strict subset
int VectorSet::operator < (const VectorSet &s) const
{
return compare(s) == 1; // A subset B, B not subset A
}
//------------------------------operator<--------------------------------------
int VectorSet::operator < (const Set &set) const
{
// The cast is a virtual function that checks that "set" is a VectorSet.
return (*this) < *(set.asVectorSet());
}
//------------------------------operator<=-------------------------------------
// Test for subset
int VectorSet::operator <= (const VectorSet &s) const
{
return compare(s) & 1; // A subset B
}
//------------------------------operator<=-------------------------------------
int VectorSet::operator <= (const Set &set) const
{
// The cast is a virtual function that checks that "set" is a VectorSet.
return (*this) <= *(set.asVectorSet());
}
//------------------------------operator[]-------------------------------------
// Test for membership. A Zero/Non-Zero value is returned!
int VectorSet::operator[](uint elem) const
{
uint word = elem >> 5; // Get the longword offset
if( word >= size ) // Beyond the last?
return 0; // Then it's clear
uint32_t mask = 1L << (elem & 31); // Get bit mask
return ((data[word] & mask))!=0; // Return the sense of the bit
}
//------------------------------Clear------------------------------------------
// Clear a set
void VectorSet::Clear(void)
{
if( size > 100 ) { // Reclaim storage only if huge
FREE_RESOURCE_ARRAY(uint32_t,data,size);
size = 2; // Small initial size
data = NEW_RESOURCE_ARRAY(uint32_t,size);
}
memset( data, 0, size*sizeof(uint32_t) );
}
//------------------------------Size-------------------------------------------
// Return number of elements in a Set
uint VectorSet::Size(void) const
{
uint sum = 0; // Cumulative size so far.
uint8_t* currByte = (uint8_t*) data;
for( uint32_t i = 0; i < (size<<2); i++) // While have bytes to process
sum += bitsInByte[*currByte++]; // Add bits in current byte to size.
return sum;
}
//------------------------------Sort-------------------------------------------
// Sort the elements for the next forall statement
void VectorSet::Sort(void)
{
}
//------------------------------hash-------------------------------------------
int VectorSet::hash() const
{
uint32_t _xor = 0;
uint lim = ((size<4)?size:4);
for( uint i = 0; i < lim; i++ )
_xor ^= data[i];
return (int)_xor;
}
//------------------------------iterate----------------------------------------
// Used by Set::print().
class VSetI_ : public SetI_ {
VectorSetI vsi;
public:
VSetI_( const VectorSet *vset, uint &elem ) : vsi(vset) { elem = vsi.elem; }
uint next(void) { ++vsi; return vsi.elem; }
int test(void) { return vsi.test(); }
};
SetI_ *VectorSet::iterate(uint &elem) const {
return new(ResourceObj::C_HEAP, mtInternal) VSetI_(this, elem);
}
//=============================================================================
//------------------------------next-------------------------------------------
// Find and return the next element of a vector set, or return garbage and
// make "VectorSetI::test()" fail.
uint VectorSetI::next(void)
{
j++; // Next element in word
mask = (mask & max_jint) << 1;// Next bit in word
do { // Do While still have words
while( mask ) { // While have bits in word
if( s->data[i] & mask ) { // If found a bit
return (i<<5)+j; // Return the bit address
}
j++; // Skip to next bit
mask = (mask & max_jint) << 1;
}
j = 0; // No more bits in word; setup for next word
mask = 1;
for( i++; (i<s->size) && (!s->data[i]); i++ ); // Skip to non-zero word
} while( i<s->size );
return max_juint; // No element, iterated them all
}