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+//===- llvm/ADT/SmallPtrSet.h - 'Normally small' pointer set ----*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the SmallPtrSet class. See the doxygen comment for
+// SmallPtrSetImplBase for more details on the algorithm used.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_ADT_SMALLPTRSET_H
+#define LLVM_ADT_SMALLPTRSET_H
+
+#include "llvm/ADT/EpochTracker.h"
+#include "llvm/Support/Compiler.h"
+#include "llvm/Support/ReverseIteration.h"
+#include "llvm/Support/type_traits.h"
+#include <cassert>
+#include <cstddef>
+#include <cstdlib>
+#include <cstring>
+#include <initializer_list>
+#include <iterator>
+#include <utility>
+
+namespace llvm {
+
+/// 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.
+///
+/// Small sets use an array of pointers allocated in the SmallPtrSet object,
+/// which is treated as a simple array of pointers. When a pointer is added to
+/// the set, the array is scanned to see if the element already exists, if not
+/// the element is 'pushed back' onto the array. If we run out of space in the
+/// array, we grow into the 'large set' case. SmallSet should be used when the
+/// sets are often small. In this case, no memory allocation is used, and only
+/// light-weight and cache-efficient scanning is used.
+///
+/// Large sets use a classic exponentially-probed hash table. Empty buckets are
+/// represented with an illegal pointer value (-1) to allow null pointers to be
+/// inserted. Tombstones are represented with another illegal pointer value
+/// (-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 SmallPtrSetImplBase : public DebugEpochBase {
+ friend class SmallPtrSetIteratorImpl;
+
+protected:
+ /// SmallArray - Points to a fixed size set of buckets, used in 'small mode'.
+ const void **SmallArray;
+ /// CurArray - This is the current set of buckets. If equal to SmallArray,
+ /// then the set is in 'small mode'.
+ const void **CurArray;
+ /// CurArraySize - The allocated size of CurArray, always a power of two.
+ unsigned CurArraySize;
+
+ /// Number of elements in CurArray that contain a value or are a tombstone.
+ /// If small, all these elements are at the beginning of CurArray and the rest
+ /// is uninitialized.
+ unsigned NumNonEmpty;
+ /// Number of tombstones in CurArray.
+ unsigned NumTombstones;
+
+ // Helpers to copy and move construct a SmallPtrSet.
+ 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), NumNonEmpty(0), NumTombstones(0) {
+ assert(SmallSize && (SmallSize & (SmallSize-1)) == 0 &&
+ "Initial size must be a power of two!");
+ }
+
+ ~SmallPtrSetImplBase() {
+ if (!isSmall())
+ free(CurArray);
+ }
+
+public:
+ using size_type = unsigned;
+
+ SmallPtrSetImplBase &operator=(const SmallPtrSetImplBase &) = delete;
+
+ LLVM_NODISCARD bool empty() const { return size() == 0; }
+ size_type size() const { return NumNonEmpty - NumTombstones; }
+
+ void clear() {
+ incrementEpoch();
+ // If the capacity of the array is huge, and the # elements used is small,
+ // shrink the array.
+ if (!isSmall()) {
+ if (size() * 4 < CurArraySize && CurArraySize > 32)
+ return shrink_and_clear();
+ // Fill the array with empty markers.
+ memset(CurArray, -1, CurArraySize * sizeof(void *));
+ }
+
+ NumNonEmpty = 0;
+ NumTombstones = 0;
+ }
+
+protected:
+ static void *getTombstoneMarker() { return reinterpret_cast<void*>(-2); }
+
+ static void *getEmptyMarker() {
+ // Note that -1 is chosen to make clear() efficiently implementable with
+ // memset and because it's not a valid pointer value.
+ return reinterpret_cast<void*>(-1);
+ }
+
+ const void **EndPointer() const {
+ return isSmall() ? CurArray + NumNonEmpty : CurArray + CurArraySize;
+ }
+
+ /// 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.
+ std::pair<const void *const *, bool> insert_imp(const void *Ptr) {
+ if (isSmall()) {
+ // Check to see if it is already in the set.
+ const void **LastTombstone = nullptr;
+ for (const void **APtr = SmallArray, **E = SmallArray + NumNonEmpty;
+ APtr != E; ++APtr) {
+ const void *Value = *APtr;
+ if (Value == Ptr)
+ return std::make_pair(APtr, false);
+ if (Value == getTombstoneMarker())
+ LastTombstone = APtr;
+ }
+
+ // Did we find any tombstone marker?
+ if (LastTombstone != nullptr) {
+ *LastTombstone = Ptr;
+ --NumTombstones;
+ incrementEpoch();
+ return std::make_pair(LastTombstone, true);
+ }
+
+ // Nope, there isn't. If we stay small, just 'pushback' now.
+ if (NumNonEmpty < CurArraySize) {
+ SmallArray[NumNonEmpty++] = Ptr;
+ incrementEpoch();
+ return std::make_pair(SmallArray + (NumNonEmpty - 1), true);
+ }
+ // Otherwise, hit the big set case, which will call grow.
+ }
+ return insert_imp_big(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
+ /// that the derived class can check that the right type of pointer is passed
+ /// in.
+ bool erase_imp(const void * Ptr) {
+ const void *const *P = find_imp(Ptr);
+ if (P == EndPointer())
+ return false;
+
+ const void **Loc = const_cast<const void **>(P);
+ assert(*Loc == Ptr && "broken find!");
+ *Loc = getTombstoneMarker();
+ NumTombstones++;
+ return true;
+ }
+
+ /// Returns the raw pointer needed to construct an iterator. If element not
+ /// found, this will be EndPointer. Otherwise, it will be a pointer to the
+ /// slot which stores Ptr;
+ const void *const * find_imp(const void * Ptr) const {
+ if (isSmall()) {
+ // Linear search for the item.
+ for (const void *const *APtr = SmallArray,
+ *const *E = SmallArray + NumNonEmpty; APtr != E; ++APtr)
+ if (*APtr == Ptr)
+ return APtr;
+ return EndPointer();
+ }
+
+ // Big set case.
+ auto *Bucket = FindBucketFor(Ptr);
+ if (*Bucket == Ptr)
+ return Bucket;
+ return EndPointer();
+ }
+
+private:
+ bool isSmall() const { return CurArray == SmallArray; }
+
+ std::pair<const void *const *, bool> insert_imp_big(const void *Ptr);
+
+ 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(unsigned NewSize);
+
+protected:
+ /// swap - Swaps the elements of two sets.
+ /// Note: This method assumes that both sets have the same small size.
+ void swap(SmallPtrSetImplBase &RHS);
+
+ void CopyFrom(const SmallPtrSetImplBase &RHS);
+ void MoveFrom(unsigned SmallSize, SmallPtrSetImplBase &&RHS);
+
+private:
+ /// Code shared by MoveFrom() and move constructor.
+ void MoveHelper(unsigned SmallSize, SmallPtrSetImplBase &&RHS);
+ /// Code shared by CopyFrom() and copy constructor.
+ void CopyHelper(const SmallPtrSetImplBase &RHS);
+};
+
+/// SmallPtrSetIteratorImpl - This is the common base class shared between all
+/// instances of SmallPtrSetIterator.
+class SmallPtrSetIteratorImpl {
+protected:
+ const void *const *Bucket;
+ const void *const *End;
+
+public:
+ explicit SmallPtrSetIteratorImpl(const void *const *BP, const void*const *E)
+ : Bucket(BP), End(E) {
+ if (shouldReverseIterate()) {
+ RetreatIfNotValid();
+ return;
+ }
+ AdvanceIfNotValid();
+ }
+
+ bool operator==(const SmallPtrSetIteratorImpl &RHS) const {
+ return Bucket == RHS.Bucket;
+ }
+ bool operator!=(const SmallPtrSetIteratorImpl &RHS) const {
+ return Bucket != RHS.Bucket;
+ }
+
+protected:
+ /// AdvanceIfNotValid - If the current bucket isn't valid, advance to a bucket
+ /// that is. This is guaranteed to stop because the end() bucket is marked
+ /// valid.
+ void AdvanceIfNotValid() {
+ assert(Bucket <= End);
+ while (Bucket != End &&
+ (*Bucket == SmallPtrSetImplBase::getEmptyMarker() ||
+ *Bucket == SmallPtrSetImplBase::getTombstoneMarker()))
+ ++Bucket;
+ }
+ void RetreatIfNotValid() {
+ assert(Bucket >= End);
+ while (Bucket != End &&
+ (Bucket[-1] == SmallPtrSetImplBase::getEmptyMarker() ||
+ Bucket[-1] == SmallPtrSetImplBase::getTombstoneMarker())) {
+ --Bucket;
+ }
+ }
+};
+
+/// SmallPtrSetIterator - This implements a const_iterator for SmallPtrSet.
+template <typename PtrTy>
+class SmallPtrSetIterator : public SmallPtrSetIteratorImpl,
+ DebugEpochBase::HandleBase {
+ using PtrTraits = PointerLikeTypeTraits<PtrTy>;
+
+public:
+ using value_type = PtrTy;
+ using reference = PtrTy;
+ using pointer = PtrTy;
+ using difference_type = std::ptrdiff_t;
+ using iterator_category = std::forward_iterator_tag;
+
+ explicit SmallPtrSetIterator(const void *const *BP, const void *const *E,
+ const DebugEpochBase &Epoch)
+ : SmallPtrSetIteratorImpl(BP, E), DebugEpochBase::HandleBase(&Epoch) {}
+
+ // Most methods provided by baseclass.
+
+ const PtrTy operator*() const {
+ assert(isHandleInSync() && "invalid iterator access!");
+ if (shouldReverseIterate()) {
+ assert(Bucket > End);
+ return PtrTraits::getFromVoidPointer(const_cast<void *>(Bucket[-1]));
+ }
+ assert(Bucket < End);
+ return PtrTraits::getFromVoidPointer(const_cast<void*>(*Bucket));
+ }
+
+ inline SmallPtrSetIterator& operator++() { // Preincrement
+ assert(isHandleInSync() && "invalid iterator access!");
+ if (shouldReverseIterate()) {
+ --Bucket;
+ RetreatIfNotValid();
+ return *this;
+ }
+ ++Bucket;
+ AdvanceIfNotValid();
+ return *this;
+ }
+
+ SmallPtrSetIterator operator++(int) { // Postincrement
+ SmallPtrSetIterator tmp = *this;
+ ++*this;
+ return tmp;
+ }
+};
+
+/// 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 RoundUpToPowerOfTwo;
+
+/// 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 RoundUpToPowerOfTwoH {
+ enum { Val = N };
+};
+template<unsigned N>
+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 = RoundUpToPowerOfTwo<(N|(N-1)) + 1>::Val
+ };
+};
+
+template<unsigned N>
+struct RoundUpToPowerOfTwo {
+ enum { Val = RoundUpToPowerOfTwoH<N, (N&(N-1)) == 0>::Val };
+};
+
+/// \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 {
+ using ConstPtrType = typename add_const_past_pointer<PtrType>::type;
+ using PtrTraits = PointerLikeTypeTraits<PtrType>;
+ using ConstPtrTraits = PointerLikeTypeTraits<ConstPtrType>;
+
+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:
+ using iterator = SmallPtrSetIterator<PtrType>;
+ using const_iterator = SmallPtrSetIterator<PtrType>;
+ using key_type = ConstPtrType;
+ using value_type = PtrType;
+
+ SmallPtrSetImpl(const SmallPtrSetImpl &) = delete;
+
+ /// 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(makeIterator(p.first), p.second);
+ }
+
+ /// erase - If the set contains the specified pointer, remove it and return
+ /// true, otherwise return false.
+ bool erase(PtrType Ptr) {
+ return erase_imp(PtrTraits::getAsVoidPointer(Ptr));
+ }
+ /// count - Return 1 if the specified pointer is in the set, 0 otherwise.
+ size_type count(ConstPtrType Ptr) const { return find(Ptr) != end() ? 1 : 0; }
+ iterator find(ConstPtrType Ptr) const {
+ return makeIterator(find_imp(ConstPtrTraits::getAsVoidPointer(Ptr)));
+ }
+
+ template <typename IterT>
+ void insert(IterT I, IterT E) {
+ for (; I != E; ++I)
+ insert(*I);
+ }
+
+ void insert(std::initializer_list<PtrType> IL) {
+ insert(IL.begin(), IL.end());
+ }
+
+ iterator begin() const {
+ if (shouldReverseIterate())
+ return makeIterator(EndPointer() - 1);
+ return makeIterator(CurArray);
+ }
+ iterator end() const { return makeIterator(EndPointer()); }
+
+private:
+ /// Create an iterator that dereferences to same place as the given pointer.
+ iterator makeIterator(const void *const *P) const {
+ if (shouldReverseIterate())
+ return iterator(P == EndPointer() ? CurArray : P + 1, CurArray, *this);
+ return iterator(P, EndPointer(), *this);
+ }
+};
+
+/// 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> {
+ // In small mode SmallPtrSet uses linear search for the elements, so it is
+ // not a good idea to choose this value too high. You may consider using a
+ // DenseSet<> instead if you expect many elements in the set.
+ static_assert(SmallSize <= 32, "SmallSize should be small");
+
+ using BaseT = SmallPtrSetImpl<PtrType>;
+
+ // 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(std::initializer_list<PtrType> IL)
+ : BaseT(SmallStorage, SmallSizePowTwo) {
+ this->insert(IL.begin(), IL.end());
+ }
+
+ SmallPtrSet<PtrType, SmallSize> &
+ operator=(const SmallPtrSet<PtrType, SmallSize> &RHS) {
+ if (&RHS != this)
+ this->CopyFrom(RHS);
+ return *this;
+ }
+
+ SmallPtrSet<PtrType, SmallSize> &
+ operator=(SmallPtrSet<PtrType, SmallSize> &&RHS) {
+ if (&RHS != this)
+ this->MoveFrom(SmallSizePowTwo, std::move(RHS));
+ return *this;
+ }
+
+ SmallPtrSet<PtrType, SmallSize> &
+ operator=(std::initializer_list<PtrType> IL) {
+ this->clear();
+ this->insert(IL.begin(), IL.end());
+ return *this;
+ }
+
+ /// swap - Swaps the elements of two sets.
+ void swap(SmallPtrSet<PtrType, SmallSize> &RHS) {
+ SmallPtrSetImplBase::swap(RHS);
+ }
+};
+
+} // end namespace llvm
+
+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);
+ }
+
+} // end namespace std
+
+#endif // LLVM_ADT_SMALLPTRSET_H