#include "llvm/ADT/StringRef.h"
#include "llvm/Support/Allocator.h"
#include <cstring>
+#include <utility>
namespace llvm {
template<typename ValueT>
/// StringMapEntryBase - Shared base class of StringMapEntry instances.
class StringMapEntryBase {
unsigned StrLen;
+
public:
explicit StringMapEntryBase(unsigned Len) : StrLen(Len) {}
unsigned NumItems;
unsigned NumTombstones;
unsigned ItemSize;
+
protected:
- explicit StringMapImpl(unsigned itemSize) : ItemSize(itemSize) {
- // Initialize the map with zero buckets to allocation.
- TheTable = 0;
- NumBuckets = 0;
- NumItems = 0;
- NumTombstones = 0;
+ explicit StringMapImpl(unsigned itemSize)
+ : TheTable(nullptr),
+ // Initialize the map with zero buckets to allocation.
+ NumBuckets(0), NumItems(0), NumTombstones(0), ItemSize(itemSize) {}
+ StringMapImpl(StringMapImpl &&RHS)
+ : TheTable(RHS.TheTable), NumBuckets(RHS.NumBuckets),
+ NumItems(RHS.NumItems), NumTombstones(RHS.NumTombstones),
+ ItemSize(RHS.ItemSize) {
+ RHS.TheTable = nullptr;
+ RHS.NumBuckets = 0;
+ RHS.NumItems = 0;
+ RHS.NumTombstones = 0;
}
+
StringMapImpl(unsigned InitSize, unsigned ItemSize);
- void RehashTable();
+ unsigned RehashTable(unsigned BucketNo = 0);
/// LookupBucketFor - Look up the bucket that the specified string should end
/// up in. If it already exists as a key in the map, the Item pointer for the
/// RemoveKey - Remove the StringMapEntry for the specified key from the
/// table, returning it. If the key is not in the table, this returns null.
StringMapEntryBase *RemoveKey(StringRef Key);
+
private:
void init(unsigned Size);
+
public:
static StringMapEntryBase *getTombstoneVal() {
return (StringMapEntryBase*)-1;
/// and data.
template<typename ValueTy>
class StringMapEntry : public StringMapEntryBase {
- StringMapEntry(StringMapEntry &E) LLVM_DELETED_FUNCTION;
+ StringMapEntry(StringMapEntry &E) = delete;
+
public:
ValueTy second;
explicit StringMapEntry(unsigned strLen)
: StringMapEntryBase(strLen), second() {}
- StringMapEntry(unsigned strLen, const ValueTy &V)
- : StringMapEntryBase(strLen), second(V) {}
+ template <class InitTy>
+ StringMapEntry(unsigned strLen, InitTy &&V)
+ : StringMapEntryBase(strLen), second(std::forward<InitTy>(V)) {}
StringRef getKey() const {
return StringRef(getKeyData(), getKeyLength());
/// Create - Create a StringMapEntry for the specified key and default
/// construct the value.
- template<typename AllocatorTy, typename InitType>
- static StringMapEntry *Create(const char *KeyStart, const char *KeyEnd,
- AllocatorTy &Allocator,
- InitType InitVal) {
- unsigned KeyLength = static_cast<unsigned>(KeyEnd-KeyStart);
+ template <typename AllocatorTy, typename InitType>
+ static StringMapEntry *Create(StringRef Key, AllocatorTy &Allocator,
+ InitType &&InitVal) {
+ unsigned KeyLength = Key.size();
// Allocate a new item with space for the string at the end and a null
// terminator.
static_cast<StringMapEntry*>(Allocator.Allocate(AllocSize,Alignment));
// Default construct the value.
- new (NewItem) StringMapEntry(KeyLength, InitVal);
+ new (NewItem) StringMapEntry(KeyLength, std::forward<InitType>(InitVal));
// Copy the string information.
char *StrBuffer = const_cast<char*>(NewItem->getKeyData());
- memcpy(StrBuffer, KeyStart, KeyLength);
+ if (KeyLength > 0)
+ memcpy(StrBuffer, Key.data(), KeyLength);
StrBuffer[KeyLength] = 0; // Null terminate for convenience of clients.
return NewItem;
}
template<typename AllocatorTy>
- static StringMapEntry *Create(const char *KeyStart, const char *KeyEnd,
- AllocatorTy &Allocator) {
- return Create(KeyStart, KeyEnd, Allocator, 0);
+ static StringMapEntry *Create(StringRef Key, AllocatorTy &Allocator) {
+ return Create(Key, Allocator, ValueTy());
}
/// Create - Create a StringMapEntry with normal malloc/free.
template<typename InitType>
- static StringMapEntry *Create(const char *KeyStart, const char *KeyEnd,
- InitType InitVal) {
+ static StringMapEntry *Create(StringRef Key, InitType &&InitVal) {
MallocAllocator A;
- return Create(KeyStart, KeyEnd, A, InitVal);
- }
-
- static StringMapEntry *Create(const char *KeyStart, const char *KeyEnd) {
- return Create(KeyStart, KeyEnd, ValueTy());
+ return Create(Key, A, std::forward<InitType>(InitVal));
}
- /// GetStringMapEntryFromValue - Given a value that is known to be embedded
- /// into a StringMapEntry, return the StringMapEntry itself.
- static StringMapEntry &GetStringMapEntryFromValue(ValueTy &V) {
- StringMapEntry *EPtr = 0;
- char *Ptr = reinterpret_cast<char*>(&V) -
- (reinterpret_cast<char*>(&EPtr->second) -
- reinterpret_cast<char*>(EPtr));
- return *reinterpret_cast<StringMapEntry*>(Ptr);
- }
- static const StringMapEntry &GetStringMapEntryFromValue(const ValueTy &V) {
- return GetStringMapEntryFromValue(const_cast<ValueTy&>(V));
+ static StringMapEntry *Create(StringRef Key) {
+ return Create(Key, ValueTy());
}
/// GetStringMapEntryFromKeyData - Given key data that is known to be embedded
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.
}
};
-
/// StringMap - This is an unconventional map that is specialized for handling
/// keys that are "strings", which are basically ranges of bytes. This does some
/// funky memory allocation and hashing things to make it extremely efficient,
template<typename ValueTy, typename AllocatorTy = MallocAllocator>
class StringMap : public StringMapImpl {
AllocatorTy Allocator;
+
public:
typedef StringMapEntry<ValueTy> MapEntryTy;
-
+
StringMap() : StringMapImpl(static_cast<unsigned>(sizeof(MapEntryTy))) {}
explicit StringMap(unsigned InitialSize)
: StringMapImpl(InitialSize, static_cast<unsigned>(sizeof(MapEntryTy))) {}
: 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!");
- (void)RHS;
- }
- void operator=(const StringMap &RHS) {
- assert(RHS.empty() &&
- "assignment from non-empty stringmap not implemented yet!");
- (void)RHS;
- clear();
+ StringMap(StringMap &&RHS)
+ : StringMapImpl(std::move(RHS)), Allocator(std::move(RHS.Allocator)) {}
+
+ StringMap &operator=(StringMap RHS) {
+ StringMapImpl::swap(RHS);
+ std::swap(Allocator, RHS.Allocator);
+ return *this;
}
- typedef typename ReferenceAdder<AllocatorTy>::result AllocatorRefTy;
- typedef typename ReferenceAdder<const AllocatorTy>::result AllocatorCRefTy;
- AllocatorRefTy getAllocator() { return Allocator; }
- AllocatorCRefTy getAllocator() const { return Allocator; }
+ // FIXME: Implement copy operations if/when they're needed.
+
+ AllocatorTy &getAllocator() { return Allocator; }
+ const AllocatorTy &getAllocator() const { return Allocator; }
typedef const char* key_type;
typedef ValueTy mapped_type;
}
ValueTy &operator[](StringRef Key) {
- return GetOrCreateValue(Key).getValue();
+ return insert(std::make_pair(Key, ValueTy())).first->second;
}
/// count - Return 1 if the element is in the map, 0 otherwise.
return true;
}
+ /// insert - Inserts the specified key/value pair into the map if the key
+ /// isn't already in the map. 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 with key equivalent to the key of the pair.
+ std::pair<iterator, bool> insert(std::pair<StringRef, ValueTy> KV) {
+ unsigned BucketNo = LookupBucketFor(KV.first);
+ StringMapEntryBase *&Bucket = TheTable[BucketNo];
+ if (Bucket && Bucket != getTombstoneVal())
+ return std::make_pair(iterator(TheTable + BucketNo, false),
+ false); // Already exists in map.
+
+ if (Bucket == getTombstoneVal())
+ --NumTombstones;
+ Bucket =
+ MapEntryTy::Create(KV.first, Allocator, std::move(KV.second));
+ ++NumItems;
+ assert(NumItems + NumTombstones <= NumBuckets);
+
+ BucketNo = RehashTable(BucketNo);
+ return std::make_pair(iterator(TheTable + BucketNo, false), true);
+ }
+
// clear - Empties out the StringMap
void clear() {
if (empty()) return;
if (Bucket && Bucket != getTombstoneVal()) {
static_cast<MapEntryTy*>(Bucket)->Destroy(Allocator);
}
- Bucket = 0;
+ Bucket = nullptr;
}
NumItems = 0;
NumTombstones = 0;
}
- /// GetOrCreateValue - Look up the specified key in the table. If a value
- /// exists, return it. Otherwise, default construct a value, insert it, and
- /// return.
- template <typename InitTy>
- MapEntryTy &GetOrCreateValue(StringRef Key, InitTy Val) {
- unsigned BucketNo = LookupBucketFor(Key);
- 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 == getTombstoneVal())
- --NumTombstones;
- ++NumItems;
- assert(NumItems + NumTombstones <= NumBuckets);
-
- // Fill in the bucket for the hash table. The FullHashValue was already
- // filled in by LookupBucketFor.
- Bucket = NewItem;
-
- RehashTable();
- return *NewItem;
- }
-
- MapEntryTy &GetOrCreateValue(StringRef Key) {
- return GetOrCreateValue(Key, ValueTy());
- }
-
/// remove - Remove the specified key/value pair from the map, but do not
/// erase it. This aborts if the key is not in the map.
void remove(MapEntryTy *KeyValue) {
}
~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:
StringMapEntryBase **Ptr;
+
public:
typedef StringMapEntry<ValueTy> value_type;
- StringMapConstIterator() : Ptr(0) { }
+ StringMapConstIterator() : Ptr(nullptr) { }
explicit StringMapConstIterator(StringMapEntryBase **Bucket,
bool NoAdvance = false)
private:
void AdvancePastEmptyBuckets() {
- while (*Ptr == 0 || *Ptr == StringMapImpl::getTombstoneVal())
+ while (*Ptr == nullptr || *Ptr == StringMapImpl::getTombstoneVal())
++Ptr;
}
};
return static_cast<StringMapEntry<ValueTy>*>(*this->Ptr);
}
};
-
}
#endif
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