#ifndef LLVM_ADT_SMALLPTRSET_H
#define LLVM_ADT_SMALLPTRSET_H
+#include "llvm/Support/Compiler.h"
+#include "llvm/Support/DataTypes.h"
+#include "llvm/Support/PointerLikeTypeTraits.h"
#include <cassert>
+#include <cstddef>
#include <cstring>
#include <iterator>
-#include "llvm/System/DataTypes.h"
-#include "llvm/Support/PointerLikeTypeTraits.h"
namespace llvm {
/// it, so that the end iterator actually points to valid memory.
unsigned CurArraySize;
- // If small, this is # elts allocated consequtively
+ // If small, this is # elts allocated consecutively
unsigned NumElements;
unsigned NumTombstones;
private:
bool isSmall() const { return CurArray == SmallArray; }
- unsigned Hash(const void *Ptr) const {
- return static_cast<unsigned>(((uintptr_t)Ptr >> 4) & (CurArraySize-1));
- }
const void * const *FindBucketFor(const void *Ptr) const;
void shrink_and_clear();
/// Grow - Allocate a larger backing store for the buckets and move it over.
- void Grow();
+ void Grow(unsigned NewSize);
- void operator=(const SmallPtrSetImpl &RHS); // DO NOT IMPLEMENT.
+ void operator=(const SmallPtrSetImpl &RHS) LLVM_DELETED_FUNCTION;
protected:
+ /// swap - Swaps the elements of two sets.
+ /// Note: This method assumes that both sets have the same small size.
+ void swap(SmallPtrSetImpl &RHS);
+
void CopyFrom(const SmallPtrSetImpl &RHS);
};
}
};
-/// NextPowerOfTwo - This is a helper template that rounds N up to the next
+/// RoundUpToPowerOfTwo - This is a helper template that rounds N up to the next
/// power of two (which means N itself if N is already a power of two).
template<unsigned N>
-struct NextPowerOfTwo;
+struct RoundUpToPowerOfTwo;
-/// NextPowerOfTwoH - If N is not a power of two, increase it. This is a helper
-/// template used to implement NextPowerOfTwo.
+/// RoundUpToPowerOfTwoH - If N is not a power of two, increase it. This is a
+/// helper template used to implement RoundUpToPowerOfTwo.
template<unsigned N, bool isPowerTwo>
-struct NextPowerOfTwoH {
+struct RoundUpToPowerOfTwoH {
enum { Val = N };
};
template<unsigned N>
-struct NextPowerOfTwoH<N, false> {
+struct RoundUpToPowerOfTwoH<N, false> {
enum {
// We could just use NextVal = N+1, but this converges faster. N|(N-1) sets
// the right-most zero bits to one all at once, e.g. 0b0011000 -> 0b0011111.
- Val = NextPowerOfTwo<(N|(N-1)) + 1>::Val
+ Val = RoundUpToPowerOfTwo<(N|(N-1)) + 1>::Val
};
};
template<unsigned N>
-struct NextPowerOfTwo {
- enum { Val = NextPowerOfTwoH<N, (N&(N-1)) == 0>::Val };
+struct RoundUpToPowerOfTwo {
+ enum { Val = RoundUpToPowerOfTwoH<N, (N&(N-1)) == 0>::Val };
};
template<class PtrType, unsigned SmallSize>
class SmallPtrSet : public SmallPtrSetImpl {
// Make sure that SmallSize is a power of two, round up if not.
- enum { SmallSizePowTwo = NextPowerOfTwo<SmallSize>::Val };
+ enum { SmallSizePowTwo = RoundUpToPowerOfTwo<SmallSize>::Val };
/// SmallStorage - Fixed size storage used in 'small mode'. The extra element
/// ensures that the end iterator actually points to valid memory.
const void *SmallStorage[SmallSizePowTwo+1];
return *this;
}
+ /// swap - Swaps the elements of two sets.
+ void swap(SmallPtrSet<PtrType, SmallSize> &RHS) {
+ SmallPtrSetImpl::swap(RHS);
+ }
};
}
+namespace std {
+ /// Implement std::swap in terms of SmallPtrSet swap.
+ template<class T, unsigned N>
+ inline void swap(llvm::SmallPtrSet<T, N> &LHS, llvm::SmallPtrSet<T, N> &RHS) {
+ LHS.swap(RHS);
+ }
+}
+
#endif