forked from triblerteam/libswift
/
binmap.cpp
2185 lines (1794 loc) · 64.1 KB
/
binmap.cpp
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#include <cassert>
#include <cstddef>
#include <cstdlib>
#include <cstring>
#include <cstdio>
#include <iostream>
#include "binmap.h"
using namespace swift;
namespace swift {
inline size_t _max_(const size_t x, const size_t y)
{
return x < y ? y : x;
}
typedef binmap_t::ref_t ref_t;
typedef binmap_t::bitmap_t bitmap_t;
/* Bitmap constants */
const bitmap_t BITMAP_EMPTY = static_cast<bitmap_t>(0);
const bitmap_t BITMAP_FILLED = static_cast<bitmap_t>(-1);
const bin_t::uint_t BITMAP_LAYER_BITS = 2 * 8 * sizeof(bitmap_t) - 1;
const ref_t ROOT_REF = 0;
#ifdef _MSC_VER
# pragma warning (push)
# pragma warning ( disable:4309 )
#endif
const bitmap_t BITMAP[] = {
static_cast<bitmap_t>(0x00000001), static_cast<bitmap_t>(0x00000003),
static_cast<bitmap_t>(0x00000002), static_cast<bitmap_t>(0x0000000f),
static_cast<bitmap_t>(0x00000004), static_cast<bitmap_t>(0x0000000c),
static_cast<bitmap_t>(0x00000008), static_cast<bitmap_t>(0x000000ff),
static_cast<bitmap_t>(0x00000010), static_cast<bitmap_t>(0x00000030),
static_cast<bitmap_t>(0x00000020), static_cast<bitmap_t>(0x000000f0),
static_cast<bitmap_t>(0x00000040), static_cast<bitmap_t>(0x000000c0),
static_cast<bitmap_t>(0x00000080), static_cast<bitmap_t>(0x0000ffff),
static_cast<bitmap_t>(0x00000100), static_cast<bitmap_t>(0x00000300),
static_cast<bitmap_t>(0x00000200), static_cast<bitmap_t>(0x00000f00),
static_cast<bitmap_t>(0x00000400), static_cast<bitmap_t>(0x00000c00),
static_cast<bitmap_t>(0x00000800), static_cast<bitmap_t>(0x0000ff00),
static_cast<bitmap_t>(0x00001000), static_cast<bitmap_t>(0x00003000),
static_cast<bitmap_t>(0x00002000), static_cast<bitmap_t>(0x0000f000),
static_cast<bitmap_t>(0x00004000), static_cast<bitmap_t>(0x0000c000),
static_cast<bitmap_t>(0x00008000), static_cast<bitmap_t>(0xffffffff),
static_cast<bitmap_t>(0x00010000), static_cast<bitmap_t>(0x00030000),
static_cast<bitmap_t>(0x00020000), static_cast<bitmap_t>(0x000f0000),
static_cast<bitmap_t>(0x00040000), static_cast<bitmap_t>(0x000c0000),
static_cast<bitmap_t>(0x00080000), static_cast<bitmap_t>(0x00ff0000),
static_cast<bitmap_t>(0x00100000), static_cast<bitmap_t>(0x00300000),
static_cast<bitmap_t>(0x00200000), static_cast<bitmap_t>(0x00f00000),
static_cast<bitmap_t>(0x00400000), static_cast<bitmap_t>(0x00c00000),
static_cast<bitmap_t>(0x00800000), static_cast<bitmap_t>(0xffff0000),
static_cast<bitmap_t>(0x01000000), static_cast<bitmap_t>(0x03000000),
static_cast<bitmap_t>(0x02000000), static_cast<bitmap_t>(0x0f000000),
static_cast<bitmap_t>(0x04000000), static_cast<bitmap_t>(0x0c000000),
static_cast<bitmap_t>(0x08000000), static_cast<bitmap_t>(0xff000000),
static_cast<bitmap_t>(0x10000000), static_cast<bitmap_t>(0x30000000),
static_cast<bitmap_t>(0x20000000), static_cast<bitmap_t>(0xf0000000),
static_cast<bitmap_t>(0x40000000), static_cast<bitmap_t>(0xc0000000),
static_cast<bitmap_t>(0x80000000), /* special */ static_cast<bitmap_t>(0xffffffff) /* special */
};
#ifdef _MSC_VER
#pragma warning (pop)
#endif
/**
* Get the leftmost bin that corresponded to bitmap (the bin is filled in bitmap)
*/
bin_t::uint_t bitmap_to_bin(register bitmap_t b)
{
static const unsigned char BITMAP_TO_BIN[] = {
0xff, 0, 2, 1, 4, 0, 2, 1, 6, 0, 2, 1, 5, 0, 2, 3,
8, 0, 2, 1, 4, 0, 2, 1, 6, 0, 2, 1, 5, 0, 2, 3,
10, 0, 2, 1, 4, 0, 2, 1, 6, 0, 2, 1, 5, 0, 2, 3,
9, 0, 2, 1, 4, 0, 2, 1, 6, 0, 2, 1, 5, 0, 2, 3,
12, 0, 2, 1, 4, 0, 2, 1, 6, 0, 2, 1, 5, 0, 2, 3,
8, 0, 2, 1, 4, 0, 2, 1, 6, 0, 2, 1, 5, 0, 2, 3,
10, 0, 2, 1, 4, 0, 2, 1, 6, 0, 2, 1, 5, 0, 2, 3,
9, 0, 2, 1, 4, 0, 2, 1, 6, 0, 2, 1, 5, 0, 2, 3,
14, 0, 2, 1, 4, 0, 2, 1, 6, 0, 2, 1, 5, 0, 2, 3,
8, 0, 2, 1, 4, 0, 2, 1, 6, 0, 2, 1, 5, 0, 2, 3,
10, 0, 2, 1, 4, 0, 2, 1, 6, 0, 2, 1, 5, 0, 2, 3,
9, 0, 2, 1, 4, 0, 2, 1, 6, 0, 2, 1, 5, 0, 2, 3,
13, 0, 2, 1, 4, 0, 2, 1, 6, 0, 2, 1, 5, 0, 2, 3,
8, 0, 2, 1, 4, 0, 2, 1, 6, 0, 2, 1, 5, 0, 2, 3,
10, 0, 2, 1, 4, 0, 2, 1, 6, 0, 2, 1, 5, 0, 2, 3,
11, 0, 2, 1, 4, 0, 2, 1, 6, 0, 2, 1, 5, 0, 2, 7
};
assert (sizeof(bitmap_t) <= 4);
assert (b != BITMAP_EMPTY);
unsigned char t;
t = BITMAP_TO_BIN[ b & 0xff ];
if (t < 16) {
if (t != 7) {
return static_cast<bin_t::uint_t>(t);
}
b += 1;
b &= -b;
if (0 == b) {
return BITMAP_LAYER_BITS / 2;
}
if (0 == (b & 0xffff)) {
return 15;
}
return 7;
}
b >>= 8;
t = BITMAP_TO_BIN[ b & 0xff ];
if (t <= 15) {
return 16 + t;
}
/* Recursion */
// return 32 + bitmap_to_bin( b >> 8 );
assert (sizeof(bitmap_t) == 4);
b >>= 8;
t = BITMAP_TO_BIN[ b & 0xff ];
if (t < 16) {
if (t != 7) {
return 32 + static_cast<bin_t::uint_t>(t);
}
b += 1;
b &= -b;
if (0 == (b & 0xffff)) {
return 47;
}
return 39;
}
b >>= 8;
return 48 + BITMAP_TO_BIN[ b & 0xff ];
}
/**
* Get the leftmost bin that corresponded to bitmap (the bin is filled in bitmap)
*/
bin_t bitmap_to_bin(const bin_t& bin, const bitmap_t bitmap)
{
assert (bitmap != BITMAP_EMPTY);
if (bitmap == BITMAP_FILLED) {
return bin;
}
return bin_t(bin.base_left().toUInt() + bitmap_to_bin(bitmap));
}
} /* namespace */
/* Methods */
/**
* Constructor
*/
binmap_t::binmap_t()
: root_bin_(63)
{
assert (sizeof(bitmap_t) <= 4);
cell_ = NULL;
cells_number_ = 0;
allocated_cells_number_ = 0;
free_top_ = ROOT_REF;
const ref_t root_ref = alloc_cell();
assert (root_ref == ROOT_REF && cells_number_ > 0);
}
/**
* Destructor
*/
binmap_t::~binmap_t()
{
if (cell_) {
free(cell_);
}
}
/**
* Allocates one cell (dirty allocation)
*/
ref_t binmap_t::_alloc_cell()
{
assert (allocated_cells_number_ < cells_number_);
/* Pop an element from the free cell list */
const ref_t ref = free_top_;
assert (cell_[ref].is_free_);
free_top_ = cell_[ ref ].free_next_;
assert (!(cell_[ ref ].is_free_ = false)); /* Reset flag in DEBUG */
++allocated_cells_number_;
return ref;
}
/**
* Allocates one cell
*/
ref_t binmap_t::alloc_cell()
{
if (!reserve_cells(1)) {
return ROOT_REF /* MEMORY ERROR or OVERFLOW ERROR */;
}
const ref_t ref = _alloc_cell();
/* Cleans cell */
memset(&cell_[ref], 0, sizeof(cell_[0]));
return ref;
}
/**
* Reserve cells allocation capacity
*/
bool binmap_t::reserve_cells(size_t count)
{
if (cells_number_ - allocated_cells_number_ < count) {
/* Finding new sizeof of the buffer */
const size_t old_cells_number = cells_number_;
const size_t new_cells_number = _max_(16U, _max_(2 * old_cells_number, allocated_cells_number_ + count));
/* Check for reference capacity */
if (static_cast<ref_t>(new_cells_number) < old_cells_number) {
fprintf(stderr, "Warning: binmap_t::reserve_cells: REFERENCE LIMIT ERROR\n");
return false /* REFERENCE LIMIT ERROR */;
}
/* Check for integer overflow */
static const size_t MAX_NUMBER = (static_cast<size_t>(-1) / sizeof(cell_[0]));
if (MAX_NUMBER < new_cells_number) {
fprintf(stderr, "Warning: binmap_t::reserve_cells: INTEGER OVERFLOW\n");
return false /* INTEGER OVERFLOW */;
}
/* Reallocate memory */
cell_t* const cell = static_cast<cell_t*>(realloc(cell_, new_cells_number * sizeof(cell_[0])));
if (cell == NULL) {
fprintf(stderr, "Warning: binmap_t::reserve_cells: MEMORY ERROR\n");
return false /* MEMORY ERROR */;
}
// Arno, 2012-09-13: Clear cells before use.
if (new_cells_number > cells_number_) {
for (int i=cells_number_; i<new_cells_number; i++) {
memset(&cell[i], 0, sizeof(cell_t));
}
}
cell_ = cell;
cells_number_ = new_cells_number;
/* Insert new cells to the free cell list */
const size_t stop_idx = old_cells_number - 1;
size_t idx = new_cells_number - 1;
cell_[ idx ].is_free_ = true;
cell_[ idx ].free_next_ = free_top_;
for (--idx; idx != stop_idx; --idx) {
cell_[ idx ].is_free_ = true;
cell_[ idx ].free_next_ = static_cast<ref_t>(idx + 1);
}
free_top_ = static_cast<ref_t>(old_cells_number);
}
return true;
}
/**
* Releases the cell
*/
void binmap_t::free_cell(ref_t ref)
{
assert (ref > 0);
assert (!cell_[ref].is_free_);
if (cell_[ref].is_left_ref_) {
free_cell(cell_[ref].left_.ref_);
}
if (cell_[ref].is_right_ref_) {
free_cell(cell_[ref].right_.ref_);
}
assert ((cell_[ref].is_free_ = true)); /* Set flag in DEBUG */
cell_[ref].free_next_ = free_top_;
free_top_ = ref;
--allocated_cells_number_;
}
/**
* Extend root
*/
bool binmap_t::extend_root()
{
assert (!root_bin_.is_all());
if (!cell_[ROOT_REF].is_left_ref_ && !cell_[ROOT_REF].is_right_ref_ && cell_[ROOT_REF].left_.bitmap_ == cell_[ROOT_REF].right_.bitmap_) {
/* Setup the root cell */
cell_[ROOT_REF].right_.bitmap_ = BITMAP_EMPTY;
} else {
/* Allocate new cell */
const ref_t ref = alloc_cell();
if (ref == ROOT_REF) {
return false /* ALLOC ERROR */;
}
/* Move old root to the cell */
cell_[ref] = cell_[ROOT_REF];
/* Setup new root */
cell_[ROOT_REF].is_left_ref_ = true;
cell_[ROOT_REF].is_right_ref_ = false;
cell_[ROOT_REF].left_.ref_ = ref;
cell_[ROOT_REF].right_.bitmap_ = BITMAP_EMPTY;
}
/* Reset bin */
root_bin_.to_parent();
return true;
}
/**
* Pack a trace of cells
*/
void binmap_t::pack_cells(ref_t* href)
{
ref_t ref = *href--;
if (ref == ROOT_REF) {
return;
}
if (cell_[ref].is_left_ref_ || cell_[ref].is_right_ref_ ||
cell_[ref].left_.bitmap_ != cell_[ref].right_.bitmap_) {
return;
}
const bitmap_t bitmap = cell_[ref].left_.bitmap_;
do {
ref = *href--;
if (!cell_[ref].is_left_ref_) {
if (cell_[ref].left_.bitmap_ != bitmap) {
break;
}
} else if (!cell_[ref].is_right_ref_) {
if (cell_[ref].right_.bitmap_ != bitmap) {
break;
}
} else {
break;
}
} while (ref != ROOT_REF);
const ref_t par_ref = href[2];
if (cell_[ref].is_left_ref_ && cell_[ref].left_.ref_ == par_ref) {
cell_[ref].is_left_ref_ = false;
cell_[ref].left_.bitmap_ = bitmap;
} else {
cell_[ref].is_right_ref_ = false;
cell_[ref].right_.bitmap_ = bitmap;
}
free_cell(par_ref);
}
/**
* Whether binmap is empty
*/
bool binmap_t::is_empty() const
{
const cell_t& cell = cell_[ROOT_REF];
return !cell.is_left_ref_ && !cell.is_right_ref_ &&
cell.left_.bitmap_ == BITMAP_EMPTY && cell.right_.bitmap_ == BITMAP_EMPTY;
}
/**
* Whether binmap is filled
*/
bool binmap_t::is_filled() const
{
const cell_t& cell = cell_[ROOT_REF];
return root_bin_.is_all() && !cell.is_left_ref_ && !cell.is_right_ref_ &&
cell.left_.bitmap_ == BITMAP_FILLED && cell.right_.bitmap_ == BITMAP_FILLED;
}
/**
* Whether range/bin is empty
*/
bool binmap_t::is_empty(const bin_t& bin) const
{
/* Process hi-layers case */
if (!root_bin_.contains(bin)) {
return !bin.contains(root_bin_) || is_empty();
}
/* Trace the bin */
ref_t cur_ref;
bin_t cur_bin;
trace(&cur_ref, &cur_bin, bin);
assert (cur_bin.layer_bits() > BITMAP_LAYER_BITS);
/* Process common case */
const cell_t& cell = cell_[cur_ref];
if (bin.layer_bits() > BITMAP_LAYER_BITS) {
if (bin < cur_bin) {
return cell.left_.bitmap_ == BITMAP_EMPTY;
}
if (cur_bin < bin) {
return cell.right_.bitmap_ == BITMAP_EMPTY;
}
return !cell.is_left_ref_ && !cell.is_right_ref_ &&
cell.left_.bitmap_ == BITMAP_EMPTY && cell.right_.bitmap_ == BITMAP_EMPTY;
}
/* Process low-layers case */
assert (bin != cur_bin);
const bitmap_t bm1 = (bin < cur_bin) ? cell.left_.bitmap_ : cell.right_.bitmap_;
const bitmap_t bm2 = BITMAP[ BITMAP_LAYER_BITS & bin.toUInt() ];
return (bm1 & bm2) == BITMAP_EMPTY;
}
/**
* Whether range/bin is filled
*/
bool binmap_t::is_filled(const bin_t& bin) const
{
/* Process hi-layers case */
if (!root_bin_.contains(bin)) {
return false;
}
/* Trace the bin */
ref_t cur_ref;
bin_t cur_bin;
trace(&cur_ref, &cur_bin, bin);
assert (cur_bin.layer_bits() > BITMAP_LAYER_BITS);
/* Process common case */
const cell_t& cell = cell_[cur_ref];
if (bin.layer_bits() > BITMAP_LAYER_BITS) {
if (bin < cur_bin) {
return cell.left_.bitmap_ == BITMAP_FILLED;
}
if (cur_bin < bin) {
return cell.right_.bitmap_ == BITMAP_FILLED;
}
return !cell.is_left_ref_ && !cell.is_right_ref_ &&
cell.left_.bitmap_ == BITMAP_FILLED && cell.right_.bitmap_ == BITMAP_FILLED;
}
/* Process low-layers case */
assert (bin != cur_bin);
const bitmap_t bm1 = (bin < cur_bin) ? cell.left_.bitmap_ : cell.right_.bitmap_;
const bitmap_t bm2 = BITMAP[ BITMAP_LAYER_BITS & bin.toUInt() ];
return (bm1 & bm2) == bm2;
}
/**
* Return the topmost solid bin which covers the specified bin
*/
bin_t binmap_t::cover(const bin_t& bin) const
{
/* Process hi-layers case */
if (!root_bin_.contains(bin)) {
if (!bin.contains(root_bin_)) {
return root_bin_.sibling();
}
if (is_empty()) {
return bin_t::ALL;
}
return bin_t::NONE;
}
/* Trace the bin */
ref_t cur_ref;
bin_t cur_bin;
trace(&cur_ref, &cur_bin, bin);
assert (cur_bin.layer_bits() > BITMAP_LAYER_BITS);
/* Process common case */
const cell_t& cell = cell_[cur_ref];
if (bin.layer_bits() > BITMAP_LAYER_BITS) {
if (bin < cur_bin) {
if (cell.left_.bitmap_ == BITMAP_EMPTY || cell.left_.bitmap_ == BITMAP_FILLED) {
return cur_bin.left();
}
return bin_t::NONE;
}
if (cur_bin < bin) {
if (cell.right_.bitmap_ == BITMAP_EMPTY || cell.right_.bitmap_ == BITMAP_FILLED) {
return cur_bin.right();
}
return bin_t::NONE;
}
if (cell.is_left_ref_ || cell.is_right_ref_) {
return bin_t::NONE;
}
if (cell.left_.bitmap_ != cell.right_.bitmap_) {
return bin_t::NONE;
}
assert (cur_bin == root_bin_);
if (cell.left_.bitmap_ == BITMAP_EMPTY) {
return bin_t::ALL;
}
if (cell.left_.bitmap_ == BITMAP_FILLED) {
return cur_bin;
}
return bin_t::NONE;
}
/* Process low-layers case */
assert (bin != cur_bin);
bitmap_t bm1;
if (bin < cur_bin) {
bm1 = cell.left_.bitmap_;
cur_bin.to_left();
} else {
bm1 = cell.right_.bitmap_;
cur_bin.to_right();
}
if (bm1 == BITMAP_EMPTY) {
if (is_empty()) {
return bin_t::ALL;
}
return cur_bin;
}
if (bm1 == BITMAP_FILLED) {
if (is_filled()) {
return bin_t::ALL;
}
return cur_bin;
}
/* Trace the bitmap */
bin_t b = bin;
bitmap_t bm2 = BITMAP[ BITMAP_LAYER_BITS & b.toUInt() ];
if ((bm1 & bm2) == BITMAP_EMPTY) {
do {
cur_bin = b;
b.to_parent();
bm2 = BITMAP[ BITMAP_LAYER_BITS & b.toUInt() ];
} while ((bm1 & bm2) == BITMAP_EMPTY);
return cur_bin;
} else if ((bm1 & bm2) == bm2) {
do {
cur_bin = b;
b.to_parent();
bm2 = BITMAP[ BITMAP_LAYER_BITS & b.toUInt() ];
} while ((bm1 & bm2) == bm2);
return cur_bin;
}
return bin_t::NONE;
}
/**
* Find first empty bin
*/
bin_t binmap_t::find_empty() const
{
/* Trace the bin */
bitmap_t bitmap = BITMAP_FILLED;
ref_t cur_ref;
bin_t cur_bin;
do {
/* Processing the root */
if (cell_[ROOT_REF].is_left_ref_) {
cur_ref = cell_[ROOT_REF].left_.ref_;
cur_bin = root_bin_.left();
} else if (cell_[ROOT_REF].left_.bitmap_ != BITMAP_FILLED) {
if (cell_[ ROOT_REF].left_.bitmap_ == BITMAP_EMPTY) {
if (!cell_[ ROOT_REF].is_right_ref_ && cell_[ ROOT_REF ].right_.bitmap_ == BITMAP_EMPTY) {
return bin_t::ALL;
}
return root_bin_.left();
}
bitmap = cell_[ROOT_REF].left_.bitmap_;
cur_bin = root_bin_.left();
break;
} else if (cell_[ROOT_REF].is_right_ref_) {
cur_ref = cell_[ROOT_REF].right_.ref_;
cur_bin = root_bin_.right();
} else {
if (cell_[ROOT_REF].right_.bitmap_ == BITMAP_FILLED) {
if (root_bin_.is_all()) {
return bin_t::NONE;
}
return root_bin_.sibling();
}
bitmap = cell_[ROOT_REF].right_.bitmap_;
cur_bin = root_bin_.right();
break;
}
/* Processing middle layers */
for ( ;;) {
if (cell_[cur_ref].is_left_ref_) {
cur_ref = cell_[cur_ref].left_.ref_;
cur_bin.to_left();
} else if (cell_[cur_ref].left_.bitmap_ != BITMAP_FILLED) {
bitmap = cell_[cur_ref].left_.bitmap_;
cur_bin.to_left();
break;
} else if (cell_[cur_ref].is_right_ref_) {
cur_ref = cell_[cur_ref].right_.ref_;
cur_bin.to_right();
} else {
assert (cell_[cur_ref].right_.bitmap_ != BITMAP_FILLED);
bitmap = cell_[cur_ref].right_.bitmap_;
cur_bin.to_right();
break;
}
}
} while (false);
/* Getting result */
assert (bitmap != BITMAP_FILLED);
return bitmap_to_bin(cur_bin, ~bitmap);
}
/**
* Find first filled bin
*/
bin_t binmap_t::find_filled() const
{
/* Trace the bin */
bitmap_t bitmap = BITMAP_EMPTY;
ref_t cur_ref;
bin_t cur_bin;
do {
/* Processing the root */
if (cell_[ROOT_REF].is_left_ref_) {
cur_ref = cell_[ROOT_REF].left_.ref_;
cur_bin = root_bin_.left();
} else if (cell_[ROOT_REF].left_.bitmap_ != BITMAP_EMPTY) {
if (cell_[ ROOT_REF].left_.bitmap_ == BITMAP_FILLED) {
if (!cell_[ ROOT_REF].is_right_ref_ && cell_[ ROOT_REF ].right_.bitmap_ == BITMAP_FILLED) {
return root_bin_;
}
return root_bin_.left();
}
bitmap = cell_[ROOT_REF].left_.bitmap_;
cur_bin = root_bin_.left();
break;
} else if (cell_[ROOT_REF].is_right_ref_) {
cur_ref = cell_[ROOT_REF].right_.ref_;
cur_bin = root_bin_.right();
} else {
if (cell_[ROOT_REF].right_.bitmap_ == BITMAP_EMPTY) {
return bin_t::NONE;
}
bitmap = cell_[ROOT_REF].right_.bitmap_;
cur_bin = root_bin_.right();
break;
}
/* Processing middle layers */
for ( ;;) {
if (cell_[cur_ref].is_left_ref_) {
cur_ref = cell_[cur_ref].left_.ref_;
cur_bin.to_left();
} else if (cell_[cur_ref].left_.bitmap_ != BITMAP_EMPTY) {
bitmap = cell_[cur_ref].left_.bitmap_;
cur_bin.to_left();
break;
} else if (cell_[cur_ref].is_right_ref_) {
cur_ref = cell_[cur_ref].right_.ref_;
cur_bin.to_right();
} else {
assert (cell_[cur_ref].right_.bitmap_ != BITMAP_EMPTY);
bitmap = cell_[cur_ref].right_.bitmap_;
cur_bin.to_right();
break;
}
}
} while (false);
/* Getting result */
assert (bitmap != BITMAP_EMPTY);
return bitmap_to_bin(cur_bin, bitmap);
}
/**
* Arno: Find first empty bin right of start (start inclusive)
*/
bin_t binmap_t::find_empty(bin_t start) const
{
bin_t cur_bin = start;
if (is_empty(cur_bin))
return cur_bin;
do
{
// Move up till we find ancestor that is not filled.
cur_bin = cur_bin.parent();
if (!is_filled(cur_bin))
{
// Ancestor is not filled
break;
}
if (cur_bin == root_bin_)
{
// Hit top, full tree, sort of. For some reason root_bin_ not
// set to real top (but to ALL), so we may actually return a
// bin that is outside the size of the content here.
return bin_t::NONE;
}
}
while (true);
// Move down
do
{
if (!is_filled(cur_bin.left()))
{
cur_bin.to_left();
}
else if (!is_filled(cur_bin.right()))
{
cur_bin.to_right();
}
if (cur_bin.is_base())
{
// Found empty bin
return cur_bin;
}
} while(!cur_bin.is_base()); // safety catch
return bin_t::NONE;
}
#define LR_LEFT (0x00)
#define RL_RIGHT (0x01)
#define RL_LEFT (0x02)
#define LR_RIGHT (0x03)
#define SSTACK() \
int _top_ = 0; \
bin_t _bin_[64]; \
ref_t _sref_[64]; \
char _dir_[64];
#define DSTACK() \
int _top_ = 0; \
bin_t _bin_[64]; \
ref_t _dref_[64]; \
char _dir_[64];
#define SDSTACK() \
int _top_ = 0; \
bin_t _bin_[64]; \
ref_t _sref_[64]; \
ref_t _dref_[64]; \
char _dir_[64];
#define SPUSH(b, sr, twist) \
do { \
_bin_[_top_] = b; \
_sref_[_top_] = sr; \
_dir_[_top_] = (0 != (twist & (b.base_length() >> 1))); \
++_top_; \
} while (false)
#define DPUSH(b, dr, twist) \
do { \
_bin_[_top_] = b; \
_dref_[_top_] = dr; \
_dir_[_top_] = (0 != (twist & (b.base_length() >> 1))); \
++_top_; \
} while (false)
#define SDPUSH(b, sr, dr, twist) \
do { \
_bin_[_top_] = b; \
_sref_[_top_] = sr; \
_dref_[_top_] = dr; \
_dir_[_top_] = (0 != (twist & (b.base_length() >> 1))); \
++_top_; \
} while (false)
#define SPOP() \
assert (_top_ < 65); \
--_top_; \
const bin_t b = _bin_[_top_]; \
const cell_t& sc = source.cell_[_sref_[_top_]]; \
const bool is_left = !(_dir_[_top_] & 0x01); \
if (0 == (_dir_[_top_] & 0x02)) { \
_dir_[_top_++] ^= 0x03; \
}
#define DPOP() \
assert (_top_ < 65); \
--_top_; \
const bin_t b = _bin_[_top_]; \
const cell_t& dc = destination.cell_[_dref_[_top_]]; \
const bool is_left = !(_dir_[_top_] & 0x01); \
if (0 == (_dir_[_top_] & 0x02)) { \
_dir_[_top_++] ^= 0x03; \
}
#define SDPOP() \
assert (_top_ < 65); \
--_top_; \
const bin_t b = _bin_[_top_]; \
const cell_t& sc = source.cell_[_sref_[_top_]]; \
const cell_t& dc = destination.cell_[_dref_[_top_]]; \
const bool is_left = !(_dir_[_top_] & 0x01); \
if (0 == (_dir_[_top_] & 0x02)) { \
_dir_[_top_++] ^= 0x03; \
}
/**
* Find first additional bin in source
*
* @param destination
* the destination binmap
* @param source
* the source binmap
*/
bin_t binmap_t::find_complement(const binmap_t& destination, const binmap_t& source, const bin_t::uint_t twist)
{
return find_complement(destination, source, bin_t::ALL, twist);
if (destination.is_empty()) {
const cell_t& cell = source.cell_[ROOT_REF];
if (!cell.is_left_ref_ && !cell.is_right_ref_ && cell.left_.bitmap_ == BITMAP_FILLED && cell.right_.bitmap_ == BITMAP_FILLED) {
return source.root_bin_;
}
return _find_complement(source.root_bin_, BITMAP_EMPTY, ROOT_REF, source, twist);
}
if (destination.root_bin_.contains(source.root_bin_)) {
ref_t dref;
bin_t dbin;
destination.trace(&dref, &dbin, source.root_bin_);
if (dbin == source.root_bin_) {
return binmap_t::_find_complement(dbin, dref, destination, ROOT_REF, source, twist);
}
assert (source.root_bin_ < dbin);
if (destination.cell_[dref].left_.bitmap_ != BITMAP_FILLED) {
if (destination.cell_[dref].left_.bitmap_ == BITMAP_EMPTY) {
const cell_t& cell = source.cell_[ROOT_REF];
if (!cell.is_left_ref_ && !cell.is_right_ref_ && cell.left_.bitmap_ == BITMAP_FILLED && cell.right_.bitmap_ == BITMAP_FILLED) {
return source.root_bin_;
}
}
return binmap_t::_find_complement(source.root_bin_, destination.cell_[dref].left_.bitmap_, ROOT_REF, source, twist);
}
return bin_t::NONE;
} else {
SSTACK();
/* Initialization */
SPUSH(source.root_bin_, ROOT_REF, twist);
/* Main loop */
do {
SPOP();
if (is_left) {
if (b.left() == destination.root_bin_) {
if (sc.is_left_ref_) {
const bin_t res = binmap_t::_find_complement(destination.root_bin_, ROOT_REF, destination, sc.left_.ref_, source, twist);
if (!res.is_none()) {
return res;
}
} else if (sc.left_.bitmap_ != BITMAP_EMPTY) {
const bin_t res = binmap_t::_find_complement(destination.root_bin_, ROOT_REF, destination, sc.left_.bitmap_, twist);
if (!res.is_none()) {
return res;
}
}
continue;
}
if (sc.is_left_ref_) {
SPUSH(b.left(), sc.left_.ref_, twist);
continue;
} else if (sc.left_.bitmap_ != BITMAP_EMPTY) {
if (0 == (twist & (b.left().base_length() - 1) & ~(destination.root_bin_.base_length() - 1))) {
const bin_t res = binmap_t::_find_complement(destination.root_bin_, ROOT_REF, destination, sc.left_.bitmap_, twist);
if (!res.is_none()) {
return res;
}
return binmap_t::_find_complement(destination.root_bin_.sibling(), BITMAP_EMPTY, sc.left_.bitmap_, twist);
} else if (sc.left_.bitmap_ != BITMAP_FILLED) {
return binmap_t::_find_complement(b.left(), BITMAP_EMPTY, sc.left_.bitmap_, twist);
} else {
bin_t::uint_t s = twist & (b.left().base_length() - 1);
/* Sorry for the following hardcode hack: Flow the highest bit of s */
s |= s >> 1; s |= s >> 2;
s |= s >> 4; s |= s >> 8;
s |= s >> 16;
s |= (s >> 16) >> 16; // FIXME: hide warning
return bin_t(s + 1 + (s >> 1)); /* bin_t(s >> 1).sibling(); */
}
}
} else {
if (sc.is_right_ref_) {
return binmap_t::_find_complement(b.right(), BITMAP_EMPTY, sc.right_.ref_, source, twist);
} else if (sc.right_.bitmap_ != BITMAP_EMPTY) {
return binmap_t::_find_complement(b.right(), BITMAP_EMPTY, sc.right_.bitmap_, twist);
}
continue;