mirror of
https://github.com/autc04/Retro68.git
synced 2024-11-24 23:32:06 +00:00
350 lines
9.3 KiB
C++
350 lines
9.3 KiB
C++
//===-- sanitizer_bitvector.h -----------------------------------*- C++ -*-===//
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Specializer BitVector implementation.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef SANITIZER_BITVECTOR_H
|
|
#define SANITIZER_BITVECTOR_H
|
|
|
|
#include "sanitizer_common.h"
|
|
|
|
namespace __sanitizer {
|
|
|
|
// Fixed size bit vector based on a single basic integer.
|
|
template <class basic_int_t = uptr>
|
|
class BasicBitVector {
|
|
public:
|
|
enum SizeEnum { kSize = sizeof(basic_int_t) * 8 };
|
|
|
|
uptr size() const { return kSize; }
|
|
// No CTOR.
|
|
void clear() { bits_ = 0; }
|
|
void setAll() { bits_ = ~(basic_int_t)0; }
|
|
bool empty() const { return bits_ == 0; }
|
|
|
|
// Returns true if the bit has changed from 0 to 1.
|
|
bool setBit(uptr idx) {
|
|
basic_int_t old = bits_;
|
|
bits_ |= mask(idx);
|
|
return bits_ != old;
|
|
}
|
|
|
|
// Returns true if the bit has changed from 1 to 0.
|
|
bool clearBit(uptr idx) {
|
|
basic_int_t old = bits_;
|
|
bits_ &= ~mask(idx);
|
|
return bits_ != old;
|
|
}
|
|
|
|
bool getBit(uptr idx) const { return (bits_ & mask(idx)) != 0; }
|
|
|
|
uptr getAndClearFirstOne() {
|
|
CHECK(!empty());
|
|
uptr idx = LeastSignificantSetBitIndex(bits_);
|
|
clearBit(idx);
|
|
return idx;
|
|
}
|
|
|
|
// Do "this |= v" and return whether new bits have been added.
|
|
bool setUnion(const BasicBitVector &v) {
|
|
basic_int_t old = bits_;
|
|
bits_ |= v.bits_;
|
|
return bits_ != old;
|
|
}
|
|
|
|
// Do "this &= v" and return whether any bits have been removed.
|
|
bool setIntersection(const BasicBitVector &v) {
|
|
basic_int_t old = bits_;
|
|
bits_ &= v.bits_;
|
|
return bits_ != old;
|
|
}
|
|
|
|
// Do "this &= ~v" and return whether any bits have been removed.
|
|
bool setDifference(const BasicBitVector &v) {
|
|
basic_int_t old = bits_;
|
|
bits_ &= ~v.bits_;
|
|
return bits_ != old;
|
|
}
|
|
|
|
void copyFrom(const BasicBitVector &v) { bits_ = v.bits_; }
|
|
|
|
// Returns true if 'this' intersects with 'v'.
|
|
bool intersectsWith(const BasicBitVector &v) const {
|
|
return (bits_ & v.bits_) != 0;
|
|
}
|
|
|
|
// for (BasicBitVector<>::Iterator it(bv); it.hasNext();) {
|
|
// uptr idx = it.next();
|
|
// use(idx);
|
|
// }
|
|
class Iterator {
|
|
public:
|
|
Iterator() { }
|
|
explicit Iterator(const BasicBitVector &bv) : bv_(bv) {}
|
|
bool hasNext() const { return !bv_.empty(); }
|
|
uptr next() { return bv_.getAndClearFirstOne(); }
|
|
void clear() { bv_.clear(); }
|
|
private:
|
|
BasicBitVector bv_;
|
|
};
|
|
|
|
private:
|
|
basic_int_t mask(uptr idx) const {
|
|
CHECK_LT(idx, size());
|
|
return (basic_int_t)1UL << idx;
|
|
}
|
|
basic_int_t bits_;
|
|
};
|
|
|
|
// Fixed size bit vector of (kLevel1Size*BV::kSize**2) bits.
|
|
// The implementation is optimized for better performance on
|
|
// sparse bit vectors, i.e. the those with few set bits.
|
|
template <uptr kLevel1Size = 1, class BV = BasicBitVector<> >
|
|
class TwoLevelBitVector {
|
|
// This is essentially a 2-level bit vector.
|
|
// Set bit in the first level BV indicates that there are set bits
|
|
// in the corresponding BV of the second level.
|
|
// This structure allows O(kLevel1Size) time for clear() and empty(),
|
|
// as well fast handling of sparse BVs.
|
|
public:
|
|
enum SizeEnum { kSize = BV::kSize * BV::kSize * kLevel1Size };
|
|
// No CTOR.
|
|
|
|
uptr size() const { return kSize; }
|
|
|
|
void clear() {
|
|
for (uptr i = 0; i < kLevel1Size; i++)
|
|
l1_[i].clear();
|
|
}
|
|
|
|
void setAll() {
|
|
for (uptr i0 = 0; i0 < kLevel1Size; i0++) {
|
|
l1_[i0].setAll();
|
|
for (uptr i1 = 0; i1 < BV::kSize; i1++)
|
|
l2_[i0][i1].setAll();
|
|
}
|
|
}
|
|
|
|
bool empty() const {
|
|
for (uptr i = 0; i < kLevel1Size; i++)
|
|
if (!l1_[i].empty())
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
// Returns true if the bit has changed from 0 to 1.
|
|
bool setBit(uptr idx) {
|
|
check(idx);
|
|
uptr i0 = idx0(idx);
|
|
uptr i1 = idx1(idx);
|
|
uptr i2 = idx2(idx);
|
|
if (!l1_[i0].getBit(i1)) {
|
|
l1_[i0].setBit(i1);
|
|
l2_[i0][i1].clear();
|
|
}
|
|
bool res = l2_[i0][i1].setBit(i2);
|
|
// Printf("%s: %zd => %zd %zd %zd; %d\n", __func__,
|
|
// idx, i0, i1, i2, res);
|
|
return res;
|
|
}
|
|
|
|
bool clearBit(uptr idx) {
|
|
check(idx);
|
|
uptr i0 = idx0(idx);
|
|
uptr i1 = idx1(idx);
|
|
uptr i2 = idx2(idx);
|
|
bool res = false;
|
|
if (l1_[i0].getBit(i1)) {
|
|
res = l2_[i0][i1].clearBit(i2);
|
|
if (l2_[i0][i1].empty())
|
|
l1_[i0].clearBit(i1);
|
|
}
|
|
return res;
|
|
}
|
|
|
|
bool getBit(uptr idx) const {
|
|
check(idx);
|
|
uptr i0 = idx0(idx);
|
|
uptr i1 = idx1(idx);
|
|
uptr i2 = idx2(idx);
|
|
// Printf("%s: %zd => %zd %zd %zd\n", __func__, idx, i0, i1, i2);
|
|
return l1_[i0].getBit(i1) && l2_[i0][i1].getBit(i2);
|
|
}
|
|
|
|
uptr getAndClearFirstOne() {
|
|
for (uptr i0 = 0; i0 < kLevel1Size; i0++) {
|
|
if (l1_[i0].empty()) continue;
|
|
uptr i1 = l1_[i0].getAndClearFirstOne();
|
|
uptr i2 = l2_[i0][i1].getAndClearFirstOne();
|
|
if (!l2_[i0][i1].empty())
|
|
l1_[i0].setBit(i1);
|
|
uptr res = i0 * BV::kSize * BV::kSize + i1 * BV::kSize + i2;
|
|
// Printf("getAndClearFirstOne: %zd %zd %zd => %zd\n", i0, i1, i2, res);
|
|
return res;
|
|
}
|
|
CHECK(0);
|
|
return 0;
|
|
}
|
|
|
|
// Do "this |= v" and return whether new bits have been added.
|
|
bool setUnion(const TwoLevelBitVector &v) {
|
|
bool res = false;
|
|
for (uptr i0 = 0; i0 < kLevel1Size; i0++) {
|
|
BV t = v.l1_[i0];
|
|
while (!t.empty()) {
|
|
uptr i1 = t.getAndClearFirstOne();
|
|
if (l1_[i0].setBit(i1))
|
|
l2_[i0][i1].clear();
|
|
if (l2_[i0][i1].setUnion(v.l2_[i0][i1]))
|
|
res = true;
|
|
}
|
|
}
|
|
return res;
|
|
}
|
|
|
|
// Do "this &= v" and return whether any bits have been removed.
|
|
bool setIntersection(const TwoLevelBitVector &v) {
|
|
bool res = false;
|
|
for (uptr i0 = 0; i0 < kLevel1Size; i0++) {
|
|
if (l1_[i0].setIntersection(v.l1_[i0]))
|
|
res = true;
|
|
if (!l1_[i0].empty()) {
|
|
BV t = l1_[i0];
|
|
while (!t.empty()) {
|
|
uptr i1 = t.getAndClearFirstOne();
|
|
if (l2_[i0][i1].setIntersection(v.l2_[i0][i1]))
|
|
res = true;
|
|
if (l2_[i0][i1].empty())
|
|
l1_[i0].clearBit(i1);
|
|
}
|
|
}
|
|
}
|
|
return res;
|
|
}
|
|
|
|
// Do "this &= ~v" and return whether any bits have been removed.
|
|
bool setDifference(const TwoLevelBitVector &v) {
|
|
bool res = false;
|
|
for (uptr i0 = 0; i0 < kLevel1Size; i0++) {
|
|
BV t = l1_[i0];
|
|
t.setIntersection(v.l1_[i0]);
|
|
while (!t.empty()) {
|
|
uptr i1 = t.getAndClearFirstOne();
|
|
if (l2_[i0][i1].setDifference(v.l2_[i0][i1]))
|
|
res = true;
|
|
if (l2_[i0][i1].empty())
|
|
l1_[i0].clearBit(i1);
|
|
}
|
|
}
|
|
return res;
|
|
}
|
|
|
|
void copyFrom(const TwoLevelBitVector &v) {
|
|
clear();
|
|
setUnion(v);
|
|
}
|
|
|
|
// Returns true if 'this' intersects with 'v'.
|
|
bool intersectsWith(const TwoLevelBitVector &v) const {
|
|
for (uptr i0 = 0; i0 < kLevel1Size; i0++) {
|
|
BV t = l1_[i0];
|
|
t.setIntersection(v.l1_[i0]);
|
|
while (!t.empty()) {
|
|
uptr i1 = t.getAndClearFirstOne();
|
|
if (!v.l1_[i0].getBit(i1)) continue;
|
|
if (l2_[i0][i1].intersectsWith(v.l2_[i0][i1]))
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
// for (TwoLevelBitVector<>::Iterator it(bv); it.hasNext();) {
|
|
// uptr idx = it.next();
|
|
// use(idx);
|
|
// }
|
|
class Iterator {
|
|
public:
|
|
Iterator() { }
|
|
explicit Iterator(const TwoLevelBitVector &bv) : bv_(bv), i0_(0), i1_(0) {
|
|
it1_.clear();
|
|
it2_.clear();
|
|
}
|
|
|
|
bool hasNext() const {
|
|
if (it1_.hasNext()) return true;
|
|
for (uptr i = i0_; i < kLevel1Size; i++)
|
|
if (!bv_.l1_[i].empty()) return true;
|
|
return false;
|
|
}
|
|
|
|
uptr next() {
|
|
// Printf("++++: %zd %zd; %d %d; size %zd\n", i0_, i1_, it1_.hasNext(),
|
|
// it2_.hasNext(), kSize);
|
|
if (!it1_.hasNext() && !it2_.hasNext()) {
|
|
for (; i0_ < kLevel1Size; i0_++) {
|
|
if (bv_.l1_[i0_].empty()) continue;
|
|
it1_ = typename BV::Iterator(bv_.l1_[i0_]);
|
|
// Printf("+i0: %zd %zd; %d %d; size %zd\n", i0_, i1_, it1_.hasNext(),
|
|
// it2_.hasNext(), kSize);
|
|
break;
|
|
}
|
|
}
|
|
if (!it2_.hasNext()) {
|
|
CHECK(it1_.hasNext());
|
|
i1_ = it1_.next();
|
|
it2_ = typename BV::Iterator(bv_.l2_[i0_][i1_]);
|
|
// Printf("++i1: %zd %zd; %d %d; size %zd\n", i0_, i1_, it1_.hasNext(),
|
|
// it2_.hasNext(), kSize);
|
|
}
|
|
CHECK(it2_.hasNext());
|
|
uptr i2 = it2_.next();
|
|
uptr res = i0_ * BV::kSize * BV::kSize + i1_ * BV::kSize + i2;
|
|
// Printf("+ret: %zd %zd; %d %d; size %zd; res: %zd\n", i0_, i1_,
|
|
// it1_.hasNext(), it2_.hasNext(), kSize, res);
|
|
if (!it1_.hasNext() && !it2_.hasNext())
|
|
i0_++;
|
|
return res;
|
|
}
|
|
|
|
private:
|
|
const TwoLevelBitVector &bv_;
|
|
uptr i0_, i1_;
|
|
typename BV::Iterator it1_, it2_;
|
|
};
|
|
|
|
private:
|
|
void check(uptr idx) const { CHECK_LE(idx, size()); }
|
|
|
|
uptr idx0(uptr idx) const {
|
|
uptr res = idx / (BV::kSize * BV::kSize);
|
|
CHECK_LE(res, kLevel1Size);
|
|
return res;
|
|
}
|
|
|
|
uptr idx1(uptr idx) const {
|
|
uptr res = (idx / BV::kSize) % BV::kSize;
|
|
CHECK_LE(res, BV::kSize);
|
|
return res;
|
|
}
|
|
|
|
uptr idx2(uptr idx) const {
|
|
uptr res = idx % BV::kSize;
|
|
CHECK_LE(res, BV::kSize);
|
|
return res;
|
|
}
|
|
|
|
BV l1_[kLevel1Size];
|
|
BV l2_[kLevel1Size][BV::kSize];
|
|
};
|
|
|
|
} // namespace __sanitizer
|
|
|
|
#endif // SANITIZER_BITVECTOR_H
|