template<typename ValueTy>
class StringMapEntry;
-/// StringMapEntryInitializer - This datatype can be partially specialized for
-/// various datatypes in a stringmap to allow them to be initialized when an
-/// entry is default constructed for the map.
-template<typename ValueTy>
-class StringMapEntryInitializer {
-public:
- template <typename InitTy>
- static void Initialize(StringMapEntry<ValueTy> &T, InitTy InitVal) {
- T.second = InitVal;
- }
-};
-
-
/// StringMapEntryBase - Shared base class of StringMapEntry instances.
class StringMapEntryBase {
unsigned StrLen;
/// StringMapImpl - This is the base class of StringMap that is shared among
/// all of its instantiations.
class StringMapImpl {
-public:
- /// ItemBucket - The hash table consists of an array of these. If Item is
- /// non-null, this is an extant entry, otherwise, it is a hole.
- struct ItemBucket {
- /// FullHashValue - This remembers the full hash value of the key for
- /// easy scanning.
- unsigned FullHashValue;
-
- /// Item - This is a pointer to the actual item object.
- StringMapEntryBase *Item;
- };
-
protected:
- ItemBucket *TheTable;
+ // Array of NumBuckets pointers to entries, null pointers are holes.
+ // TheTable[NumBuckets] contains a sentinel value for easy iteration. Followed
+ // by an array of the actual hash values as unsigned integers.
+ StringMapEntryBase **TheTable;
unsigned NumBuckets;
unsigned NumItems;
unsigned NumTombstones;
protected:
explicit StringMapImpl(unsigned itemSize) : ItemSize(itemSize) {
// Initialize the map with zero buckets to allocation.
- TheTable = 0;
+ TheTable = nullptr;
NumBuckets = 0;
NumItems = 0;
NumTombstones = 0;
bool empty() const { return NumItems == 0; }
unsigned size() const { return NumItems; }
+
+ void swap(StringMapImpl &Other) {
+ std::swap(TheTable, Other.TheTable);
+ std::swap(NumBuckets, Other.NumBuckets);
+ std::swap(NumItems, Other.NumItems);
+ std::swap(NumTombstones, Other.NumTombstones);
+ }
};
/// StringMapEntry - This is used to represent one value that is inserted into
/// and data.
template<typename ValueTy>
class StringMapEntry : public StringMapEntryBase {
+ StringMapEntry(StringMapEntry &E) LLVM_DELETED_FUNCTION;
public:
ValueTy second;
InitType InitVal) {
unsigned KeyLength = static_cast<unsigned>(KeyEnd-KeyStart);
- // Okay, the item doesn't already exist, and 'Bucket' is the bucket to fill
- // in. Allocate a new item with space for the string at the end and a null
+ // Allocate a new item with space for the string at the end and a null
// terminator.
-
unsigned AllocSize = static_cast<unsigned>(sizeof(StringMapEntry))+
KeyLength+1;
unsigned Alignment = alignOf<StringMapEntry>();
static_cast<StringMapEntry*>(Allocator.Allocate(AllocSize,Alignment));
// Default construct the value.
- new (NewItem) StringMapEntry(KeyLength);
+ new (NewItem) StringMapEntry(KeyLength, InitVal);
// Copy the string information.
char *StrBuffer = const_cast<char*>(NewItem->getKeyData());
memcpy(StrBuffer, KeyStart, KeyLength);
StrBuffer[KeyLength] = 0; // Null terminate for convenience of clients.
-
- // Initialize the value if the client wants to.
- StringMapEntryInitializer<ValueTy>::Initialize(*NewItem, InitVal);
return NewItem;
}
return Create(KeyStart, KeyEnd, Allocator, 0);
}
-
/// Create - Create a StringMapEntry with normal malloc/free.
template<typename InitType>
static StringMapEntry *Create(const char *KeyStart, const char *KeyEnd,
return *reinterpret_cast<StringMapEntry*>(Ptr);
}
-
/// Destroy - Destroy this StringMapEntry, releasing memory back to the
/// specified allocator.
template<typename AllocatorTy>
void Destroy(AllocatorTy &Allocator) {
// Free memory referenced by the item.
+ unsigned AllocSize =
+ static_cast<unsigned>(sizeof(StringMapEntry)) + getKeyLength() + 1;
this->~StringMapEntry();
- Allocator.Deallocate(this);
+ Allocator.Deallocate(static_cast<void *>(this), AllocSize);
}
/// Destroy this object, releasing memory back to the malloc allocator.
template<typename ValueTy, typename AllocatorTy = MallocAllocator>
class StringMap : public StringMapImpl {
AllocatorTy Allocator;
- typedef StringMapEntry<ValueTy> MapEntryTy;
public:
+ typedef StringMapEntry<ValueTy> MapEntryTy;
+
StringMap() : StringMapImpl(static_cast<unsigned>(sizeof(MapEntryTy))) {}
explicit StringMap(unsigned InitialSize)
: StringMapImpl(InitialSize, static_cast<unsigned>(sizeof(MapEntryTy))) {}
explicit StringMap(AllocatorTy A)
: StringMapImpl(static_cast<unsigned>(sizeof(MapEntryTy))), Allocator(A) {}
- explicit StringMap(const StringMap &RHS)
+ StringMap(unsigned InitialSize, AllocatorTy A)
+ : StringMapImpl(InitialSize, static_cast<unsigned>(sizeof(MapEntryTy))),
+ Allocator(A) {}
+
+ StringMap(const StringMap &RHS)
: StringMapImpl(static_cast<unsigned>(sizeof(MapEntryTy))) {
assert(RHS.empty() &&
"Copy ctor from non-empty stringmap not implemented yet!");
clear();
}
- typedef typename ReferenceAdder<AllocatorTy>::result AllocatorRefTy;
- typedef typename ReferenceAdder<const AllocatorTy>::result AllocatorCRefTy;
- AllocatorRefTy getAllocator() { return Allocator; }
- AllocatorCRefTy getAllocator() const { return Allocator; }
+ AllocatorTy &getAllocator() { return Allocator; }
+ const AllocatorTy &getAllocator() const { return Allocator; }
typedef const char* key_type;
typedef ValueTy mapped_type;
iterator find(StringRef Key) {
int Bucket = FindKey(Key);
if (Bucket == -1) return end();
- return iterator(TheTable+Bucket);
+ return iterator(TheTable+Bucket, true);
}
const_iterator find(StringRef Key) const {
int Bucket = FindKey(Key);
if (Bucket == -1) return end();
- return const_iterator(TheTable+Bucket);
+ return const_iterator(TheTable+Bucket, true);
}
- /// lookup - Return the entry for the specified key, or a default
+ /// lookup - Return the entry for the specified key, or a default
/// constructed value if no such entry exists.
ValueTy lookup(StringRef Key) const {
const_iterator it = find(Key);
return GetOrCreateValue(Key).getValue();
}
+ /// count - Return 1 if the element is in the map, 0 otherwise.
size_type count(StringRef Key) const {
return find(Key) == end() ? 0 : 1;
}
/// insert it and return true.
bool insert(MapEntryTy *KeyValue) {
unsigned BucketNo = LookupBucketFor(KeyValue->getKey());
- ItemBucket &Bucket = TheTable[BucketNo];
- if (Bucket.Item && Bucket.Item != getTombstoneVal())
+ StringMapEntryBase *&Bucket = TheTable[BucketNo];
+ if (Bucket && Bucket != getTombstoneVal())
return false; // Already exists in map.
- if (Bucket.Item == getTombstoneVal())
+ if (Bucket == getTombstoneVal())
--NumTombstones;
- Bucket.Item = KeyValue;
+ Bucket = KeyValue;
++NumItems;
assert(NumItems + NumTombstones <= NumBuckets);
// Zap all values, resetting the keys back to non-present (not tombstone),
// which is safe because we're removing all elements.
- for (ItemBucket *I = TheTable, *E = TheTable+NumBuckets; I != E; ++I) {
- if (I->Item && I->Item != getTombstoneVal()) {
- static_cast<MapEntryTy*>(I->Item)->Destroy(Allocator);
- I->Item = 0;
+ for (unsigned I = 0, E = NumBuckets; I != E; ++I) {
+ StringMapEntryBase *&Bucket = TheTable[I];
+ if (Bucket && Bucket != getTombstoneVal()) {
+ static_cast<MapEntryTy*>(Bucket)->Destroy(Allocator);
}
+ Bucket = nullptr;
}
NumItems = 0;
template <typename InitTy>
MapEntryTy &GetOrCreateValue(StringRef Key, InitTy Val) {
unsigned BucketNo = LookupBucketFor(Key);
- ItemBucket &Bucket = TheTable[BucketNo];
- if (Bucket.Item && Bucket.Item != getTombstoneVal())
- return *static_cast<MapEntryTy*>(Bucket.Item);
+ StringMapEntryBase *&Bucket = TheTable[BucketNo];
+ if (Bucket && Bucket != getTombstoneVal())
+ return *static_cast<MapEntryTy*>(Bucket);
MapEntryTy *NewItem =
MapEntryTy::Create(Key.begin(), Key.end(), Allocator, Val);
- if (Bucket.Item == getTombstoneVal())
+ if (Bucket == getTombstoneVal())
--NumTombstones;
++NumItems;
assert(NumItems + NumTombstones <= NumBuckets);
// Fill in the bucket for the hash table. The FullHashValue was already
// filled in by LookupBucketFor.
- Bucket.Item = NewItem;
+ Bucket = NewItem;
RehashTable();
return *NewItem;
}
~StringMap() {
- clear();
+ // Delete all the elements in the map, but don't reset the elements
+ // to default values. This is a copy of clear(), but avoids unnecessary
+ // work not required in the destructor.
+ if (!empty()) {
+ for (unsigned I = 0, E = NumBuckets; I != E; ++I) {
+ StringMapEntryBase *Bucket = TheTable[I];
+ if (Bucket && Bucket != getTombstoneVal()) {
+ static_cast<MapEntryTy*>(Bucket)->Destroy(Allocator);
+ }
+ }
+ }
free(TheTable);
}
};
template<typename ValueTy>
class StringMapConstIterator {
protected:
- StringMapImpl::ItemBucket *Ptr;
+ StringMapEntryBase **Ptr;
public:
typedef StringMapEntry<ValueTy> value_type;
- explicit StringMapConstIterator(StringMapImpl::ItemBucket *Bucket,
+ StringMapConstIterator() : Ptr(nullptr) { }
+
+ explicit StringMapConstIterator(StringMapEntryBase **Bucket,
bool NoAdvance = false)
: Ptr(Bucket) {
if (!NoAdvance) AdvancePastEmptyBuckets();
}
const value_type &operator*() const {
- return *static_cast<StringMapEntry<ValueTy>*>(Ptr->Item);
+ return *static_cast<StringMapEntry<ValueTy>*>(*Ptr);
}
const value_type *operator->() const {
- return static_cast<StringMapEntry<ValueTy>*>(Ptr->Item);
+ return static_cast<StringMapEntry<ValueTy>*>(*Ptr);
}
bool operator==(const StringMapConstIterator &RHS) const {
return Ptr != RHS.Ptr;
}
- inline StringMapConstIterator& operator++() { // Preincrement
+ inline StringMapConstIterator& operator++() { // Preincrement
++Ptr;
AdvancePastEmptyBuckets();
return *this;
private:
void AdvancePastEmptyBuckets() {
- while (Ptr->Item == 0 || Ptr->Item == StringMapImpl::getTombstoneVal())
+ while (*Ptr == nullptr || *Ptr == StringMapImpl::getTombstoneVal())
++Ptr;
}
};
template<typename ValueTy>
class StringMapIterator : public StringMapConstIterator<ValueTy> {
public:
- explicit StringMapIterator(StringMapImpl::ItemBucket *Bucket,
+ StringMapIterator() {}
+ explicit StringMapIterator(StringMapEntryBase **Bucket,
bool NoAdvance = false)
: StringMapConstIterator<ValueTy>(Bucket, NoAdvance) {
}
StringMapEntry<ValueTy> &operator*() const {
- return *static_cast<StringMapEntry<ValueTy>*>(this->Ptr->Item);
+ return *static_cast<StringMapEntry<ValueTy>*>(*this->Ptr);
}
StringMapEntry<ValueTy> *operator->() const {
- return static_cast<StringMapEntry<ValueTy>*>(this->Ptr->Item);
+ return static_cast<StringMapEntry<ValueTy>*>(*this->Ptr);
}
};
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