#ifndef LLVM_ADT_DENSEMAP_H
#define LLVM_ADT_DENSEMAP_H
-#include "llvm/Support/DataTypes.h"
#include "llvm/Support/MathExtras.h"
-#include <cassert>
+#include "llvm/Support/PointerLikeTypeTraits.h"
+#include "llvm/Support/type_traits.h"
+#include "llvm/ADT/DenseMapInfo.h"
+#include <iterator>
+#include <new>
#include <utility>
+#include <cassert>
+#include <cstddef>
+#include <cstring>
namespace llvm {
-template<typename T>
-struct DenseMapInfo {
- //static inline T getEmptyKey();
- //static inline T getTombstoneKey();
- //static unsigned getHashValue(const T &Val);
- //static bool isEqual(const T &LHS, const T &RHS);
- //static bool isPod()
-};
-
-// Provide DenseMapInfo for all pointers.
-template<typename T>
-struct DenseMapInfo<T*> {
- static inline T* getEmptyKey() { return reinterpret_cast<T*>(-1); }
- static inline T* getTombstoneKey() { return reinterpret_cast<T*>(-2); }
- static unsigned getHashValue(const T *PtrVal) {
- return (unsigned((uintptr_t)PtrVal) >> 4) ^
- (unsigned((uintptr_t)PtrVal) >> 9);
- }
- static bool isEqual(const T *LHS, const T *RHS) { return LHS == RHS; }
- static bool isPod() { return true; }
-};
-
-// Provide DenseMapInfo for unsigned ints.
-template<> struct DenseMapInfo<unsigned> {
- static inline unsigned getEmptyKey() { return ~0; }
- static inline unsigned getTombstoneKey() { return ~0 - 1; }
- static unsigned getHashValue(const unsigned& Val) { return Val * 37; }
- static bool isPod() { return true; }
- static bool isEqual(const unsigned& LHS, const unsigned& RHS) {
- return LHS == RHS;
- }
-};
-
-// Provide DenseMapInfo for unsigned longs.
-template<> struct DenseMapInfo<unsigned long> {
- static inline unsigned long getEmptyKey() { return ~0L; }
- static inline unsigned long getTombstoneKey() { return ~0L - 1L; }
- static unsigned getHashValue(const unsigned long& Val) { return Val * 37L; }
- static bool isPod() { return true; }
- static bool isEqual(const unsigned long& LHS, const unsigned long& RHS) {
- return LHS == RHS;
- }
-};
-
-// Provide DenseMapInfo for all pairs whose members have info.
-template<typename T, typename U>
-struct DenseMapInfo<std::pair<T, U> > {
- typedef std::pair<T, U> Pair;
- typedef DenseMapInfo<T> FirstInfo;
- typedef DenseMapInfo<U> SecondInfo;
-
- static inline Pair getEmptyKey() {
- return std::make_pair(FirstInfo::getEmptyKey(),
- SecondInfo::getEmptyKey());
- }
- static inline Pair getTombstoneKey() {
- return std::make_pair(FirstInfo::getTombstoneKey(),
- SecondInfo::getEmptyKey());
- }
- static unsigned getHashValue(const Pair& PairVal) {
- uint64_t key = (uint64_t)FirstInfo::getHashValue(PairVal.first) << 32
- | (uint64_t)SecondInfo::getHashValue(PairVal.second);
- key += ~(key << 32);
- key ^= (key >> 22);
- key += ~(key << 13);
- key ^= (key >> 8);
- key += (key << 3);
- key ^= (key >> 15);
- key += ~(key << 27);
- key ^= (key >> 31);
- return (unsigned)key;
- }
- static bool isEqual(const Pair& LHS, const Pair& RHS) { return LHS == RHS; }
- static bool isPod() { return FirstInfo::isPod() && SecondInfo::isPod(); }
-};
-
template<typename KeyT, typename ValueT,
typename KeyInfoT = DenseMapInfo<KeyT>,
- typename ValueInfoT = DenseMapInfo<ValueT> >
+ typename ValueInfoT = DenseMapInfo<ValueT>, bool IsConst = false>
class DenseMapIterator;
-template<typename KeyT, typename ValueT,
- typename KeyInfoT = DenseMapInfo<KeyT>,
- typename ValueInfoT = DenseMapInfo<ValueT> >
-class DenseMapConstIterator;
template<typename KeyT, typename ValueT,
typename KeyInfoT = DenseMapInfo<KeyT>,
typedef ValueT mapped_type;
typedef BucketT value_type;
- DenseMap(const DenseMap& other) {
+ DenseMap(const DenseMap &other) {
NumBuckets = 0;
CopyFrom(other);
}
init(NumInitBuckets);
}
+ template<typename InputIt>
+ DenseMap(const InputIt &I, const InputIt &E) {
+ init(64);
+ insert(I, E);
+ }
+
~DenseMap() {
const KeyT EmptyKey = getEmptyKey(), TombstoneKey = getTombstoneKey();
for (BucketT *P = Buckets, *E = Buckets+NumBuckets; P != E; ++P) {
P->second.~ValueT();
P->first.~KeyT();
}
+#ifndef NDEBUG
+ memset(Buckets, 0x5a, sizeof(BucketT)*NumBuckets);
+#endif
operator delete(Buckets);
}
typedef DenseMapIterator<KeyT, ValueT, KeyInfoT> iterator;
- typedef DenseMapConstIterator<KeyT, ValueT, KeyInfoT> const_iterator;
+ typedef DenseMapIterator<KeyT, ValueT,
+ KeyInfoT, ValueInfoT, true> const_iterator;
inline iterator begin() {
- return iterator(Buckets, Buckets+NumBuckets);
+ // When the map is empty, avoid the overhead of AdvancePastEmptyBuckets().
+ return empty() ? end() : iterator(Buckets, Buckets+NumBuckets);
}
inline iterator end() {
return iterator(Buckets+NumBuckets, Buckets+NumBuckets);
}
inline const_iterator begin() const {
- return const_iterator(Buckets, Buckets+NumBuckets);
+ return empty() ? end() : const_iterator(Buckets, Buckets+NumBuckets);
}
inline const_iterator end() const {
return const_iterator(Buckets+NumBuckets, Buckets+NumBuckets);
void resize(size_t Size) { grow(Size); }
void clear() {
+ if (NumEntries == 0 && NumTombstones == 0) return;
+
// If the capacity of the array is huge, and the # elements used is small,
// shrink the array.
if (NumEntries * 4 < NumBuckets && NumBuckets > 64) {
return ValueT();
}
+ // Inserts key,value pair into the map if the key isn't already in the map.
+ // If the key is already in the map, it returns false and doesn't update the
+ // value.
std::pair<iterator, bool> insert(const std::pair<KeyT, ValueT> &KV) {
BucketT *TheBucket;
if (LookupBucketFor(KV.first, TheBucket))
++NumTombstones;
return true;
}
- bool erase(iterator I) {
+ void erase(iterator I) {
BucketT *TheBucket = &*I;
TheBucket->second.~ValueT();
TheBucket->first = getTombstoneKey();
--NumEntries;
++NumTombstones;
- return true;
+ }
+
+ void swap(DenseMap& RHS) {
+ std::swap(NumBuckets, RHS.NumBuckets);
+ std::swap(Buckets, RHS.Buckets);
+ std::swap(NumEntries, RHS.NumEntries);
+ std::swap(NumTombstones, RHS.NumTombstones);
}
value_type& FindAndConstruct(const KeyT &Key) {
return *this;
}
+ /// isPointerIntoBucketsArray - Return true if the specified pointer points
+ /// somewhere into the DenseMap's array of buckets (i.e. either to a key or
+ /// value in the DenseMap).
+ bool isPointerIntoBucketsArray(const void *Ptr) const {
+ return Ptr >= Buckets && Ptr < Buckets+NumBuckets;
+ }
+
+ /// getPointerIntoBucketsArray() - Return an opaque pointer into the buckets
+ /// array. In conjunction with the previous method, this can be used to
+ /// determine whether an insertion caused the DenseMap to reallocate.
+ const void *getPointerIntoBucketsArray() const { return Buckets; }
+
private:
void CopyFrom(const DenseMap& other) {
- if (NumBuckets != 0 && (!KeyInfoT::isPod() || !ValueInfoT::isPod())) {
+ if (NumBuckets != 0 &&
+ (!isPodLike<KeyInfoT>::value || !isPodLike<ValueInfoT>::value)) {
const KeyT EmptyKey = getEmptyKey(), TombstoneKey = getTombstoneKey();
for (BucketT *P = Buckets, *E = Buckets+NumBuckets; P != E; ++P) {
if (!KeyInfoT::isEqual(P->first, EmptyKey) &&
NumEntries = other.NumEntries;
NumTombstones = other.NumTombstones;
- if (NumBuckets)
+ if (NumBuckets) {
+#ifndef NDEBUG
+ memset(Buckets, 0x5a, sizeof(BucketT)*NumBuckets);
+#endif
operator delete(Buckets);
+ }
Buckets = static_cast<BucketT*>(operator new(sizeof(BucketT) *
other.NumBuckets));
- if (KeyInfoT::isPod() && ValueInfoT::isPod())
+ if (isPodLike<KeyInfoT>::value && isPodLike<ValueInfoT>::value)
memcpy(Buckets, other.Buckets, other.NumBuckets * sizeof(BucketT));
else
for (size_t i = 0; i < other.NumBuckets; ++i) {
// probe almost the entire table until it found the empty bucket. If the
// table completely filled with tombstones, no lookup would ever succeed,
// causing infinite loops in lookup.
+ ++NumEntries;
if (NumEntries*4 >= NumBuckets*3 ||
NumBuckets-(NumEntries+NumTombstones) < NumBuckets/8) {
this->grow(NumBuckets * 2);
LookupBucketFor(Key, TheBucket);
}
- ++NumEntries;
// If we are writing over a tombstone, remember this.
if (!KeyInfoT::isEqual(TheBucket->first, getEmptyKey()))
BucketT *OldBuckets = Buckets;
// Double the number of buckets.
- while (NumBuckets <= AtLeast)
+ while (NumBuckets < AtLeast)
NumBuckets <<= 1;
NumTombstones = 0;
Buckets = static_cast<BucketT*>(operator new(sizeof(BucketT)*NumBuckets));
B->first.~KeyT();
}
+#ifndef NDEBUG
+ memset(OldBuckets, 0x5a, sizeof(BucketT)*OldNumBuckets);
+#endif
// Free the old table.
operator delete(OldBuckets);
}
B->first.~KeyT();
}
+#ifndef NDEBUG
+ memset(OldBuckets, 0x5a, sizeof(BucketT)*OldNumBuckets);
+#endif
// Free the old table.
operator delete(OldBuckets);
}
};
-template<typename KeyT, typename ValueT, typename KeyInfoT, typename ValueInfoT>
+template<typename KeyT, typename ValueT,
+ typename KeyInfoT, typename ValueInfoT, bool IsConst>
class DenseMapIterator {
- typedef std::pair<KeyT, ValueT> BucketT;
-protected:
- const BucketT *Ptr, *End;
+ typedef std::pair<KeyT, ValueT> Bucket;
+ typedef DenseMapIterator<KeyT, ValueT,
+ KeyInfoT, ValueInfoT, true> ConstIterator;
+ friend class DenseMapIterator<KeyT, ValueT, KeyInfoT, ValueInfoT, true>;
+public:
+ typedef ptrdiff_t difference_type;
+ typedef typename conditional<IsConst, const Bucket, Bucket>::type value_type;
+ typedef value_type *pointer;
+ typedef value_type &reference;
+ typedef std::forward_iterator_tag iterator_category;
+private:
+ pointer Ptr, End;
public:
- DenseMapIterator(void) : Ptr(0), End(0) {}
+ DenseMapIterator() : Ptr(0), End(0) {}
- DenseMapIterator(const BucketT *Pos, const BucketT *E) : Ptr(Pos), End(E) {
+ DenseMapIterator(pointer Pos, pointer E) : Ptr(Pos), End(E) {
AdvancePastEmptyBuckets();
}
- std::pair<KeyT, ValueT> &operator*() const {
- return *const_cast<BucketT*>(Ptr);
+ // If IsConst is true this is a converting constructor from iterator to
+ // const_iterator and the default copy constructor is used.
+ // Otherwise this is a copy constructor for iterator.
+ DenseMapIterator(const DenseMapIterator<KeyT, ValueT,
+ KeyInfoT, ValueInfoT, false>& I)
+ : Ptr(I.Ptr), End(I.End) {}
+
+ reference operator*() const {
+ return *Ptr;
}
- std::pair<KeyT, ValueT> *operator->() const {
- return const_cast<BucketT*>(Ptr);
+ pointer operator->() const {
+ return Ptr;
}
- bool operator==(const DenseMapIterator &RHS) const {
- return Ptr == RHS.Ptr;
+ bool operator==(const ConstIterator &RHS) const {
+ return Ptr == RHS.operator->();
}
- bool operator!=(const DenseMapIterator &RHS) const {
- return Ptr != RHS.Ptr;
+ bool operator!=(const ConstIterator &RHS) const {
+ return Ptr != RHS.operator->();
}
- inline DenseMapIterator& operator++() { // Preincrement
+ inline DenseMapIterator& operator++() { // Preincrement
++Ptr;
AdvancePastEmptyBuckets();
return *this;
}
- DenseMapIterator operator++(int) { // Postincrement
+ DenseMapIterator operator++(int) { // Postincrement
DenseMapIterator tmp = *this; ++*this; return tmp;
}
}
};
-template<typename KeyT, typename ValueT, typename KeyInfoT, typename ValueInfoT>
-class DenseMapConstIterator : public DenseMapIterator<KeyT, ValueT, KeyInfoT> {
-public:
- DenseMapConstIterator(void) : DenseMapIterator<KeyT, ValueT, KeyInfoT>() {}
- DenseMapConstIterator(const std::pair<KeyT, ValueT> *Pos,
- const std::pair<KeyT, ValueT> *E)
- : DenseMapIterator<KeyT, ValueT, KeyInfoT>(Pos, E) {
- }
- const std::pair<KeyT, ValueT> &operator*() const {
- return *this->Ptr;
- }
- const std::pair<KeyT, ValueT> *operator->() const {
- return this->Ptr;
- }
-};
-
} // end namespace llvm
#endif
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