//
// 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.
//
//===----------------------------------------------------------------------===//
//
#ifndef LLVM_ADT_BITVECTOR_H
#define LLVM_ADT_BITVECTOR_H
+#include "llvm/Support/Compiler.h"
+#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MathExtras.h"
#include <algorithm>
-#include <cstdlib>
#include <cassert>
+#include <climits>
+#include <cstdlib>
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
/// bits are initialized to the specified value.
explicit BitVector(unsigned s, bool t = false) : Size(s) {
Capacity = NumBitWords(s);
- Bits = new BitWord[Capacity];
+ Bits = (BitWord *)std::malloc(Capacity * sizeof(BitWord));
init_words(Bits, Capacity, t);
if (t)
clear_unused_bits();
/// BitVector copy ctor.
BitVector(const BitVector &RHS) : Size(RHS.size()) {
if (Size == 0) {
- Bits = NULL;
+ Bits = 0;
Capacity = 0;
return;
}
Capacity = NumBitWords(RHS.size());
- Bits = new BitWord[Capacity];
- std::copy(RHS.Bits, &RHS.Bits[Capacity], Bits);
+ Bits = (BitWord *)std::malloc(Capacity * sizeof(BitWord));
+ std::memcpy(Bits, RHS.Bits, Capacity * sizeof(BitWord));
+ }
+
+#if LLVM_HAS_RVALUE_REFERENCES
+ BitVector(BitVector &&RHS)
+ : Bits(RHS.Bits), Size(RHS.Size), Capacity(RHS.Capacity) {
+ RHS.Bits = 0;
}
-
+#endif
+
~BitVector() {
- delete[] Bits;
+ std::free(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
- assert(0 && "Unsupported!");
+ llvm_unreachable("Unsupported!");
return NumBits;
}
return false;
}
+ /// all - Returns true if all bits are set.
+ bool all() const {
+ for (unsigned i = 0; i < Size / BITWORD_SIZE; ++i)
+ if (Bits[i] != ~0UL)
+ return false;
+
+ // If bits remain check that they are ones. The unused bits are always zero.
+ if (unsigned Remainder = Size % BITWORD_SIZE)
+ return Bits[Size / BITWORD_SIZE] == (1UL << Remainder) - 1;
+
+ return true;
+ }
+
/// 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]);
- else if (sizeof(BitWord) == 8)
- return i * BITWORD_SIZE + CountTrailingZeros_64(Bits[i]);
- else
- assert(0 && "Unsupported!");
+ return i * BITWORD_SIZE + countTrailingZeros((uint32_t)Bits[i]);
+ if (sizeof(BitWord) == 8)
+ return i * BITWORD_SIZE + countTrailingZeros(Bits[i]);
+ llvm_unreachable("Unsupported!");
}
return -1;
}
unsigned BitPos = Prev % BITWORD_SIZE;
BitWord Copy = Bits[WordPos];
// Mask off previous bits.
- Copy &= ~0L << BitPos;
+ Copy &= ~0UL << BitPos;
if (Copy != 0) {
if (sizeof(BitWord) == 4)
- return WordPos * BITWORD_SIZE + CountTrailingZeros_32(Copy);
- else if (sizeof(BitWord) == 8)
- return WordPos * BITWORD_SIZE + CountTrailingZeros_64(Copy);
- else
- assert(0 && "Unsupported!");
+ return WordPos * BITWORD_SIZE + countTrailingZeros((uint32_t)Copy);
+ if (sizeof(BitWord) == 8)
+ return WordPos * BITWORD_SIZE + countTrailingZeros(Copy);
+ llvm_unreachable("Unsupported!");
}
// Check subsequent words.
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]);
- else if (sizeof(BitWord) == 8)
- return i * BITWORD_SIZE + CountTrailingZeros_64(Bits[i]);
- else
- assert(0 && "Unsupported!");
+ return i * BITWORD_SIZE + countTrailingZeros((uint32_t)Bits[i]);
+ if (sizeof(BitWord) == 8)
+ return i * BITWORD_SIZE + countTrailingZeros(Bits[i]);
+ llvm_unreachable("Unsupported!");
}
return -1;
}
grow(N);
init_words(&Bits[OldCapacity], (Capacity-OldCapacity), t);
}
-
- // If we previously had no size, initialize the low word
- if (Size == 0)
- for (unsigned i = 0; i < Capacity; ++i)
- Bits[i] = 0 - (unsigned)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
+ // 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;
- clear_unused_bits();
+ if (t || N < OldSize)
+ clear_unused_bits();
}
void reserve(unsigned N) {
return *this;
}
+ /// set - Efficiently set a range of bits in [I, E)
+ BitVector &set(unsigned I, unsigned E) {
+ assert(I <= E && "Attempted to set backwards range!");
+ assert(E <= size() && "Attempted to set out-of-bounds range!");
+
+ if (I == E) return *this;
+
+ if (I / BITWORD_SIZE == E / BITWORD_SIZE) {
+ BitWord EMask = 1UL << (E % BITWORD_SIZE);
+ BitWord IMask = 1UL << (I % BITWORD_SIZE);
+ BitWord Mask = EMask - IMask;
+ Bits[I / BITWORD_SIZE] |= Mask;
+ return *this;
+ }
+
+ BitWord PrefixMask = ~0UL << (I % BITWORD_SIZE);
+ Bits[I / BITWORD_SIZE] |= PrefixMask;
+ I = RoundUpToAlignment(I, BITWORD_SIZE);
+
+ for (; I + BITWORD_SIZE <= E; I += BITWORD_SIZE)
+ Bits[I / BITWORD_SIZE] = ~0UL;
+
+ BitWord PostfixMask = (1UL << (E % BITWORD_SIZE)) - 1;
+ Bits[I / BITWORD_SIZE] |= PostfixMask;
+
+ return *this;
+ }
+
BitVector &reset() {
init_words(Bits, Capacity, false);
return *this;
return *this;
}
+ /// reset - Efficiently reset a range of bits in [I, E)
+ BitVector &reset(unsigned I, unsigned E) {
+ assert(I <= E && "Attempted to reset backwards range!");
+ assert(E <= size() && "Attempted to reset out-of-bounds range!");
+
+ if (I == E) return *this;
+
+ if (I / BITWORD_SIZE == E / BITWORD_SIZE) {
+ BitWord EMask = 1UL << (E % BITWORD_SIZE);
+ BitWord IMask = 1UL << (I % BITWORD_SIZE);
+ BitWord Mask = EMask - IMask;
+ Bits[I / BITWORD_SIZE] &= ~Mask;
+ return *this;
+ }
+
+ BitWord PrefixMask = ~0UL << (I % BITWORD_SIZE);
+ Bits[I / BITWORD_SIZE] &= ~PrefixMask;
+ I = RoundUpToAlignment(I, BITWORD_SIZE);
+
+ for (; I + BITWORD_SIZE <= E; I += BITWORD_SIZE)
+ Bits[I / BITWORD_SIZE] = 0UL;
+
+ BitWord PostfixMask = (1UL << (E % BITWORD_SIZE)) - 1;
+ Bits[I / BITWORD_SIZE] &= ~PostfixMask;
+
+ return *this;
+ }
+
BitVector &flip() {
for (unsigned i = 0; i < NumBitWords(size()); ++i)
Bits[i] = ~Bits[i];
return *this;
}
- // No argument flip.
- BitVector operator~() const {
- return BitVector(*this).flip();
- }
-
// 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;
}
return (*this)[Idx];
}
+ /// Test if any common bits are set.
+ bool anyCommon(const BitVector &RHS) const {
+ unsigned ThisWords = NumBitWords(size());
+ unsigned RHSWords = NumBitWords(RHS.size());
+ for (unsigned i = 0, e = std::min(ThisWords, RHSWords); i != e; ++i)
+ if (Bits[i] & RHS.Bits[i])
+ return true;
+ return false;
+ }
+
// Comparison operators.
bool operator==(const BitVector &RHS) const {
- if (Size != RHS.Size)
- return false;
-
- for (unsigned i = 0; i < NumBitWords(size()); ++i)
+ unsigned ThisWords = NumBitWords(size());
+ unsigned RHSWords = NumBitWords(RHS.size());
+ unsigned i;
+ 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)
+ if (Bits[i])
+ return false;
+ } else if (i != RHSWords) {
+ for (; i != RHSWords; ++i)
+ if (RHS.Bits[i])
+ return false;
+ }
return true;
}
return !(*this == RHS);
}
- // Intersection, union, disjoint union.
- BitVector operator&=(const BitVector &RHS) {
- assert(Size == RHS.Size && "Illegal operation!");
- for (unsigned i = 0; i < NumBitWords(size()); ++i)
+ /// Intersection, union, disjoint union.
+ 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)
+ /// reset - Reset bits that are set in RHS. Same as *this &= ~RHS.
+ BitVector &reset(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];
+ return *this;
+ }
+
+ /// test - Check if (This - RHS) is zero.
+ /// This is the same as reset(RHS) and any().
+ bool test(const BitVector &RHS) const {
+ unsigned ThisWords = NumBitWords(size());
+ unsigned RHSWords = NumBitWords(RHS.size());
+ unsigned i;
+ for (i = 0; i != std::min(ThisWords, RHSWords); ++i)
+ if ((Bits[i] & ~RHS.Bits[i]) != 0)
+ return true;
+
+ for (; i != ThisWords ; ++i)
+ if (Bits[i] != 0)
+ return true;
+
+ return false;
+ }
+
+ 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::memcpy(Bits, RHS.Bits, RHSWords * sizeof(BitWord));
clear_unused_bits();
return *this;
}
-
+
// Grow the bitvector to have enough elements.
- Capacity = NumBitWords(Size);
- BitWord *NewBits = new BitWord[Capacity];
- std::copy(RHS.Bits, &RHS.Bits[RHSWords], NewBits);
+ Capacity = RHSWords;
+ BitWord *NewBits = (BitWord *)std::malloc(Capacity * sizeof(BitWord));
+ std::memcpy(NewBits, RHS.Bits, Capacity * sizeof(BitWord));
// Destroy the old bits.
- delete[] Bits;
+ std::free(Bits);
Bits = NewBits;
return *this;
}
+#if LLVM_HAS_RVALUE_REFERENCES
+ const BitVector &operator=(BitVector &&RHS) {
+ if (this == &RHS) return *this;
+
+ std::free(Bits);
+ Bits = RHS.Bits;
+ Size = RHS.Size;
+ Capacity = RHS.Capacity;
+
+ RHS.Bits = 0;
+
+ return *this;
+ }
+#endif
+
+ void swap(BitVector &RHS) {
+ std::swap(Bits, RHS.Bits);
+ std::swap(Size, RHS.Size);
+ std::swap(Capacity, RHS.Capacity);
+ }
+
+ //===--------------------------------------------------------------------===//
+ // Portable bit mask operations.
+ //===--------------------------------------------------------------------===//
+ //
+ // These methods all operate on arrays of uint32_t, each holding 32 bits. The
+ // fixed word size makes it easier to work with literal bit vector constants
+ // in portable code.
+ //
+ // The LSB in each word is the lowest numbered bit. The size of a portable
+ // bit mask is always a whole multiple of 32 bits. If no bit mask size is
+ // given, the bit mask is assumed to cover the entire BitVector.
+
+ /// setBitsInMask - Add '1' bits from Mask to this vector. Don't resize.
+ /// This computes "*this |= Mask".
+ void setBitsInMask(const uint32_t *Mask, unsigned MaskWords = ~0u) {
+ applyMask<true, false>(Mask, MaskWords);
+ }
+
+ /// clearBitsInMask - Clear any bits in this vector that are set in Mask.
+ /// Don't resize. This computes "*this &= ~Mask".
+ void clearBitsInMask(const uint32_t *Mask, unsigned MaskWords = ~0u) {
+ applyMask<false, false>(Mask, MaskWords);
+ }
+
+ /// setBitsNotInMask - Add a bit to this vector for every '0' bit in Mask.
+ /// Don't resize. This computes "*this |= ~Mask".
+ void setBitsNotInMask(const uint32_t *Mask, unsigned MaskWords = ~0u) {
+ applyMask<true, true>(Mask, MaskWords);
+ }
+
+ /// clearBitsNotInMask - Clear a bit in this vector for every '0' bit in Mask.
+ /// Don't resize. This computes "*this &= Mask".
+ void clearBitsNotInMask(const uint32_t *Mask, unsigned MaskWords = ~0u) {
+ applyMask<false, true>(Mask, MaskWords);
+ }
+
private:
unsigned NumBitWords(unsigned S) const {
return (S + BITWORD_SIZE-1) / BITWORD_SIZE;
}
- // Clear the unused top bits in the high word.
- void clear_unused_bits() {
+ // 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) {
- unsigned index = Size / BITWORD_SIZE;
- Bits[index] &= ~(~0L << ExtraBits);
+ BitWord ExtraBitMask = ~0UL << ExtraBits;
+ if (t)
+ Bits[UsedWords-1] |= ExtraBitMask;
+ else
+ Bits[UsedWords-1] &= ~ExtraBitMask;
}
}
- void grow(unsigned NewSize) {
- unsigned OldCapacity = Capacity;
- Capacity = NumBitWords(NewSize);
- BitWord *NewBits = new BitWord[Capacity];
+ // Clear the unused bits in the high words.
+ void clear_unused_bits() {
+ set_unused_bits(false);
+ }
- // Copy the old bits over.
- if (OldCapacity != 0)
- std::copy(Bits, &Bits[OldCapacity], NewBits);
+ void grow(unsigned NewSize) {
+ Capacity = std::max(NumBitWords(NewSize), Capacity * 2);
+ Bits = (BitWord *)std::realloc(Bits, Capacity * sizeof(BitWord));
- // 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));
- }
+ }
+
+ template<bool AddBits, bool InvertMask>
+ void applyMask(const uint32_t *Mask, unsigned MaskWords) {
+ assert(BITWORD_SIZE % 32 == 0 && "Unsupported BitWord size.");
+ MaskWords = std::min(MaskWords, (size() + 31) / 32);
+ const unsigned Scale = BITWORD_SIZE / 32;
+ unsigned i;
+ for (i = 0; MaskWords >= Scale; ++i, MaskWords -= Scale) {
+ BitWord BW = Bits[i];
+ // This inner loop should unroll completely when BITWORD_SIZE > 32.
+ for (unsigned b = 0; b != BITWORD_SIZE; b += 32) {
+ uint32_t M = *Mask++;
+ if (InvertMask) M = ~M;
+ if (AddBits) BW |= BitWord(M) << b;
+ else BW &= ~(BitWord(M) << b);
+ }
+ Bits[i] = BW;
+ }
+ for (unsigned b = 0; MaskWords; b += 32, --MaskWords) {
+ uint32_t M = *Mask++;
+ if (InvertMask) M = ~M;
+ if (AddBits) Bits[i] |= BitWord(M) << b;
+ else Bits[i] &= ~(BitWord(M) << b);
+ }
+ if (AddBits)
+ clear_unused_bits();
+ }
};
-inline BitVector operator&(const BitVector &LHS, const BitVector &RHS) {
- BitVector Result(LHS);
- Result &= RHS;
- return Result;
-}
+} // End llvm namespace
-inline BitVector operator|(const BitVector &LHS, const BitVector &RHS) {
- BitVector Result(LHS);
- Result |= RHS;
- return Result;
+namespace std {
+ /// Implement std::swap in terms of BitVector swap.
+ inline void
+ swap(llvm::BitVector &LHS, llvm::BitVector &RHS) {
+ LHS.swap(RHS);
+ }
}
-inline BitVector operator^(const BitVector &LHS, const BitVector &RHS) {
- BitVector Result(LHS);
- Result ^= RHS;
- return Result;
-}
-
-} // End llvm namespace
#endif