//
// The LLVM Compiler Infrastructure
//
-// This file was developed by Evan Cheng and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
#include "llvm/Support/MathExtras.h"
#include <algorithm>
-#include <cstdlib>
#include <cassert>
+#include <climits>
+#include <cstring>
namespace llvm {
class BitVector {
typedef unsigned long BitWord;
- enum { BITWORD_SIZE = sizeof(BitWord) * 8 };
+ enum { BITWORD_SIZE = (unsigned)sizeof(BitWord) * CHAR_BIT };
- BitWord *Bits; // Actual bits.
+ BitWord *Bits; // Actual bits.
unsigned Size; // Size of bitvector in bits.
unsigned Capacity; // Size of allocated memory in BitWord.
~reference() {}
+ reference &operator=(reference t) {
+ *this = bool(t);
+ return *this;
+ }
+
reference& operator=(bool t) {
if (t)
*WordRef |= 1L << BitPos;
}
operator bool() const {
- return (*WordRef) & (1L << BitPos);
+ return ((*WordRef) & (1L << BitPos)) ? true : false;
}
};
/// BitVector default ctor - Creates an empty bitvector.
BitVector() : Size(0), Capacity(0) {
- Bits = NULL;
+ Bits = 0;
}
/// BitVector ctor - Creates a bitvector of specified number of bits. All
/// BitVector copy ctor.
BitVector(const BitVector &RHS) : Size(RHS.size()) {
if (Size == 0) {
- Bits = NULL;
+ Bits = 0;
Capacity = 0;
return;
}
Bits = new BitWord[Capacity];
std::copy(RHS.Bits, &RHS.Bits[Capacity], Bits);
}
-
+
~BitVector() {
delete[] Bits;
}
+ /// empty - Tests whether there are no bits in this bitvector.
+ bool empty() const { return Size == 0; }
+
/// size - Returns the number of bits in this bitvector.
unsigned size() const { return Size; }
unsigned NumBits = 0;
for (unsigned i = 0; i < NumBitWords(size()); ++i)
if (sizeof(BitWord) == 4)
- NumBits += CountPopulation_32(Bits[i]);
+ NumBits += CountPopulation_32((uint32_t)Bits[i]);
else if (sizeof(BitWord) == 8)
NumBits += CountPopulation_64(Bits[i]);
else
return false;
}
+ /// all - Returns true if all bits are set.
+ bool all() const {
+ // TODO: Optimize this.
+ return count() == size();
+ }
+
/// none - Returns true if none of the bits are set.
bool none() const {
return !any();
for (unsigned i = 0; i < NumBitWords(size()); ++i)
if (Bits[i] != 0) {
if (sizeof(BitWord) == 4)
- return i * BITWORD_SIZE + CountTrailingZeros_32(Bits[i]);
+ return i * BITWORD_SIZE + CountTrailingZeros_32((uint32_t)Bits[i]);
else if (sizeof(BitWord) == 8)
return i * BITWORD_SIZE + CountTrailingZeros_64(Bits[i]);
else
if (Copy != 0) {
if (sizeof(BitWord) == 4)
- return WordPos * BITWORD_SIZE + CountTrailingZeros_32(Copy);
+ return WordPos * BITWORD_SIZE + CountTrailingZeros_32((uint32_t)Copy);
else if (sizeof(BitWord) == 8)
return WordPos * BITWORD_SIZE + CountTrailingZeros_64(Copy);
else
for (unsigned i = WordPos+1; i < NumBitWords(size()); ++i)
if (Bits[i] != 0) {
if (sizeof(BitWord) == 4)
- return i * BITWORD_SIZE + CountTrailingZeros_32(Bits[i]);
+ return i * BITWORD_SIZE + CountTrailingZeros_32((uint32_t)Bits[i]);
else if (sizeof(BitWord) == 8)
return i * BITWORD_SIZE + CountTrailingZeros_64(Bits[i]);
else
grow(N);
init_words(&Bits[OldCapacity], (Capacity-OldCapacity), t);
}
-
- // Set any old unused bits that are now included in the BitVector. This
- // may set bits that are not included in the new vector, but we will clear
+
+ // Set any old unused bits that are now included in the BitVector. This
+ // may set bits that are not included in the new vector, but we will clear
// them back out below.
if (N > Size)
set_unused_bits(t);
-
+
// Update the size, and clear out any bits that are now unused
unsigned OldSize = Size;
Size = N;
// Indexing.
reference operator[](unsigned Idx) {
+ assert (Idx < Size && "Out-of-bounds Bit access.");
return reference(*this, Idx);
}
bool operator[](unsigned Idx) const {
+ assert (Idx < Size && "Out-of-bounds Bit access.");
BitWord Mask = 1L << (Idx % BITWORD_SIZE);
return (Bits[Idx / BITWORD_SIZE] & Mask) != 0;
}
for (i = 0; i != std::min(ThisWords, RHSWords); ++i)
if (Bits[i] != RHS.Bits[i])
return false;
-
+
// Verify that any extra words are all zeros.
if (i != ThisWords) {
for (; i != ThisWords; ++i)
}
// Intersection, union, disjoint union.
- BitVector operator&=(const BitVector &RHS) {
+ BitVector &operator&=(const BitVector &RHS) {
unsigned ThisWords = NumBitWords(size());
unsigned RHSWords = NumBitWords(RHS.size());
unsigned i;
for (i = 0; i != std::min(ThisWords, RHSWords); ++i)
Bits[i] &= RHS.Bits[i];
-
+
// Any bits that are just in this bitvector become zero, because they aren't
// in the RHS bit vector. Any words only in RHS are ignored because they
// are already zero in the LHS.
for (; i != ThisWords; ++i)
Bits[i] = 0;
-
+
return *this;
}
- BitVector operator|=(const BitVector &RHS) {
- assert(Size == RHS.Size && "Illegal operation!");
- for (unsigned i = 0; i < NumBitWords(size()); ++i)
+ BitVector &operator|=(const BitVector &RHS) {
+ if (size() < RHS.size())
+ resize(RHS.size());
+ for (size_t i = 0, e = NumBitWords(RHS.size()); i != e; ++i)
Bits[i] |= RHS.Bits[i];
return *this;
}
- BitVector operator^=(const BitVector &RHS) {
- assert(Size == RHS.Size && "Illegal operation!");
- for (unsigned i = 0; i < NumBitWords(size()); ++i)
+ BitVector &operator^=(const BitVector &RHS) {
+ if (size() < RHS.size())
+ resize(RHS.size());
+ for (size_t i = 0, e = NumBitWords(RHS.size()); i != e; ++i)
Bits[i] ^= RHS.Bits[i];
return *this;
}
-
+
// Assignment operator.
const BitVector &operator=(const BitVector &RHS) {
if (this == &RHS) return *this;
Size = RHS.size();
unsigned RHSWords = NumBitWords(Size);
if (Size <= Capacity * BITWORD_SIZE) {
- std::copy(RHS.Bits, &RHS.Bits[RHSWords], Bits);
+ if (Size)
+ std::copy(RHS.Bits, &RHS.Bits[RHSWords], Bits);
clear_unused_bits();
return *this;
}
-
+
// Grow the bitvector to have enough elements.
Capacity = RHSWords;
BitWord *NewBits = new BitWord[Capacity];
return *this;
}
+ void swap(BitVector &RHS) {
+ std::swap(Bits, RHS.Bits);
+ std::swap(Size, RHS.Size);
+ std::swap(Capacity, RHS.Capacity);
+ }
+
private:
unsigned NumBitWords(unsigned S) const {
return (S + BITWORD_SIZE-1) / BITWORD_SIZE;
}
-
+
// Set the unused bits in the high words.
void set_unused_bits(bool t = true) {
// Set high words first.
unsigned UsedWords = NumBitWords(Size);
if (Capacity > UsedWords)
init_words(&Bits[UsedWords], (Capacity-UsedWords), t);
-
+
// Then set any stray high bits of the last used word.
unsigned ExtraBits = Size % BITWORD_SIZE;
if (ExtraBits) {
// Destroy the old bits.
delete[] Bits;
Bits = NewBits;
+
+ clear_unused_bits();
}
void init_words(BitWord *B, unsigned NumWords, bool t) {
memset(B, 0 - (int)t, NumWords*sizeof(BitWord));
- }
+ }
};
inline BitVector operator&(const BitVector &LHS, const BitVector &RHS) {
Result ^= RHS;
return Result;
}
-
+
} // End llvm namespace
+
+namespace std {
+ /// Implement std::swap in terms of BitVector swap.
+ inline void
+ swap(llvm::BitVector &LHS, llvm::BitVector &RHS) {
+ LHS.swap(RHS);
+ }
+}
+
#endif
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