//===----------------------------------------------------------------------===//
//
// This file defines the SmallPtrSet class. See the doxygen comment for
-// SmallPtrSetImpl for more details on the algorithm used.
+// SmallPtrSetImplBase for more details on the algorithm used.
//
//===----------------------------------------------------------------------===//
#include <cstddef>
#include <cstring>
#include <iterator>
+#include <utility>
namespace llvm {
class SmallPtrSetIteratorImpl;
-/// SmallPtrSetImpl - This is the common code shared among all the
+/// SmallPtrSetImplBase - This is the common code shared among all the
/// SmallPtrSet<>'s, which is almost everything. SmallPtrSet has two modes, one
/// for small and one for large sets.
///
/// (-2), to allow deletion. The hash table is resized when the table is 3/4 or
/// more. When this happens, the table is doubled in size.
///
-class SmallPtrSetImpl {
+class SmallPtrSetImplBase {
friend class SmallPtrSetIteratorImpl;
protected:
/// SmallArray - Points to a fixed size set of buckets, used in 'small mode'.
unsigned NumTombstones;
// Helpers to copy and move construct a SmallPtrSet.
- SmallPtrSetImpl(const void **SmallStorage, const SmallPtrSetImpl &that);
-#if LLVM_HAS_RVALUE_REFERENCES
- SmallPtrSetImpl(const void **SmallStorage, unsigned SmallSize,
- SmallPtrSetImpl &&that);
-#endif
- explicit SmallPtrSetImpl(const void **SmallStorage, unsigned SmallSize) :
+ SmallPtrSetImplBase(const void **SmallStorage, const SmallPtrSetImplBase &that);
+ SmallPtrSetImplBase(const void **SmallStorage, unsigned SmallSize,
+ SmallPtrSetImplBase &&that);
+ explicit SmallPtrSetImplBase(const void **SmallStorage, unsigned SmallSize) :
SmallArray(SmallStorage), CurArray(SmallStorage), CurArraySize(SmallSize) {
assert(SmallSize && (SmallSize & (SmallSize-1)) == 0 &&
"Initial size must be a power of two!");
clear();
}
- ~SmallPtrSetImpl();
+ ~SmallPtrSetImplBase();
public:
+ typedef unsigned size_type;
bool LLVM_ATTRIBUTE_UNUSED_RESULT empty() const { return size() == 0; }
- unsigned size() const { return NumElements; }
+ size_type size() const { return NumElements; }
void clear() {
// If the capacity of the array is huge, and the # elements used is small,
/// insert_imp - This returns true if the pointer was new to the set, false if
/// it was already in the set. This is hidden from the client so that the
/// derived class can check that the right type of pointer is passed in.
- bool insert_imp(const void * Ptr);
+ std::pair<const void *const *, bool> insert_imp(const void *Ptr);
/// erase_imp - If the set contains the specified pointer, remove it and
/// return true, otherwise return false. This is hidden from the client so
/// Grow - Allocate a larger backing store for the buckets and move it over.
void Grow(unsigned NewSize);
- void operator=(const SmallPtrSetImpl &RHS) LLVM_DELETED_FUNCTION;
+ void operator=(const SmallPtrSetImplBase &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 swap(SmallPtrSetImplBase &RHS);
- void CopyFrom(const SmallPtrSetImpl &RHS);
-#if LLVM_HAS_RVALUE_REFERENCES
- void MoveFrom(unsigned SmallSize, SmallPtrSetImpl &&RHS);
-#endif
+ void CopyFrom(const SmallPtrSetImplBase &RHS);
+ void MoveFrom(unsigned SmallSize, SmallPtrSetImplBase &&RHS);
};
/// SmallPtrSetIteratorImpl - This is the common base class shared between all
void AdvanceIfNotValid() {
assert(Bucket <= End);
while (Bucket != End &&
- (*Bucket == SmallPtrSetImpl::getEmptyMarker() ||
- *Bucket == SmallPtrSetImpl::getTombstoneMarker()))
+ (*Bucket == SmallPtrSetImplBase::getEmptyMarker() ||
+ *Bucket == SmallPtrSetImplBase::getTombstoneMarker()))
++Bucket;
}
};
};
-/// SmallPtrSet - This class implements a set which is optimized for holding
-/// SmallSize or less elements. This internally rounds up SmallSize to the next
-/// power of two if it is not already a power of two. See the comments above
-/// SmallPtrSetImpl for details of the algorithm.
-template<class PtrType, unsigned SmallSize>
-class SmallPtrSet : public SmallPtrSetImpl {
- // Make sure that SmallSize is a power of two, round up if not.
- enum { SmallSizePowTwo = RoundUpToPowerOfTwo<SmallSize>::Val };
- /// SmallStorage - Fixed size storage used in 'small mode'.
- const void *SmallStorage[SmallSizePowTwo];
+/// \brief A templated base class for \c SmallPtrSet which provides the
+/// typesafe interface that is common across all small sizes.
+///
+/// This is particularly useful for passing around between interface boundaries
+/// to avoid encoding a particular small size in the interface boundary.
+template <typename PtrType>
+class SmallPtrSetImpl : public SmallPtrSetImplBase {
typedef PointerLikeTypeTraits<PtrType> PtrTraits;
-public:
- SmallPtrSet() : SmallPtrSetImpl(SmallStorage, SmallSizePowTwo) {}
- SmallPtrSet(const SmallPtrSet &that) : SmallPtrSetImpl(SmallStorage, that) {}
-#if LLVM_HAS_RVALUE_REFERENCES
- SmallPtrSet(SmallPtrSet &&that)
- : SmallPtrSetImpl(SmallStorage, SmallSizePowTwo, std::move(that)) {}
-#endif
- template<typename It>
- SmallPtrSet(It I, It E) : SmallPtrSetImpl(SmallStorage, SmallSizePowTwo) {
- insert(I, E);
- }
+ SmallPtrSetImpl(const SmallPtrSetImpl&) LLVM_DELETED_FUNCTION;
+protected:
+ // Constructors that forward to the base.
+ SmallPtrSetImpl(const void **SmallStorage, const SmallPtrSetImpl &that)
+ : SmallPtrSetImplBase(SmallStorage, that) {}
+ SmallPtrSetImpl(const void **SmallStorage, unsigned SmallSize,
+ SmallPtrSetImpl &&that)
+ : SmallPtrSetImplBase(SmallStorage, SmallSize, std::move(that)) {}
+ explicit SmallPtrSetImpl(const void **SmallStorage, unsigned SmallSize)
+ : SmallPtrSetImplBase(SmallStorage, SmallSize) {}
+
+public:
+ typedef SmallPtrSetIterator<PtrType> iterator;
+ typedef SmallPtrSetIterator<PtrType> const_iterator;
- /// insert - This returns true if the pointer was new to the set, false if it
- /// was already in the set.
- bool insert(PtrType Ptr) {
- return insert_imp(PtrTraits::getAsVoidPointer(Ptr));
+ /// Inserts Ptr if and only if there is no element in the container equal to
+ /// Ptr. The bool component of the returned pair is true if and only if the
+ /// insertion takes place, and the iterator component of the pair points to
+ /// the element equal to Ptr.
+ std::pair<iterator, bool> insert(PtrType Ptr) {
+ auto p = insert_imp(PtrTraits::getAsVoidPointer(Ptr));
+ return std::make_pair(iterator(p.first, CurArray + CurArraySize), p.second);
}
/// erase - If the set contains the specified pointer, remove it and return
}
/// count - Return 1 if the specified pointer is in the set, 0 otherwise.
- unsigned count(PtrType Ptr) const {
+ size_type count(PtrType Ptr) const {
return count_imp(PtrTraits::getAsVoidPointer(Ptr)) ? 1 : 0;
}
insert(*I);
}
- typedef SmallPtrSetIterator<PtrType> iterator;
- typedef SmallPtrSetIterator<PtrType> const_iterator;
inline iterator begin() const {
return iterator(CurArray, CurArray+CurArraySize);
}
inline iterator end() const {
return iterator(CurArray+CurArraySize, CurArray+CurArraySize);
}
+};
+
+/// SmallPtrSet - This class implements a set which is optimized for holding
+/// SmallSize or less elements. This internally rounds up SmallSize to the next
+/// power of two if it is not already a power of two. See the comments above
+/// SmallPtrSetImplBase for details of the algorithm.
+template<class PtrType, unsigned SmallSize>
+class SmallPtrSet : public SmallPtrSetImpl<PtrType> {
+ typedef SmallPtrSetImpl<PtrType> BaseT;
+
+ // Make sure that SmallSize is a power of two, round up if not.
+ enum { SmallSizePowTwo = RoundUpToPowerOfTwo<SmallSize>::Val };
+ /// SmallStorage - Fixed size storage used in 'small mode'.
+ const void *SmallStorage[SmallSizePowTwo];
+public:
+ SmallPtrSet() : BaseT(SmallStorage, SmallSizePowTwo) {}
+ SmallPtrSet(const SmallPtrSet &that) : BaseT(SmallStorage, that) {}
+ SmallPtrSet(SmallPtrSet &&that)
+ : BaseT(SmallStorage, SmallSizePowTwo, std::move(that)) {}
+
+ template<typename It>
+ SmallPtrSet(It I, It E) : BaseT(SmallStorage, SmallSizePowTwo) {
+ this->insert(I, E);
+ }
SmallPtrSet<PtrType, SmallSize> &
operator=(const SmallPtrSet<PtrType, SmallSize> &RHS) {
if (&RHS != this)
- CopyFrom(RHS);
+ this->CopyFrom(RHS);
return *this;
}
-#if LLVM_HAS_RVALUE_REFERENCES
SmallPtrSet<PtrType, SmallSize>&
operator=(SmallPtrSet<PtrType, SmallSize> &&RHS) {
if (&RHS != this)
- MoveFrom(SmallSizePowTwo, std::move(RHS));
+ this->MoveFrom(SmallSizePowTwo, std::move(RHS));
return *this;
}
-#endif
/// swap - Swaps the elements of two sets.
void swap(SmallPtrSet<PtrType, SmallSize> &RHS) {
- SmallPtrSetImpl::swap(RHS);
+ SmallPtrSetImplBase::swap(RHS);
}
};
projects / oota-llvm.git / blobdiff