#include "llvm/ADT/StringRef.h"
#include "llvm/Support/Allocator.h"
#include <cstring>
-#include <string>
namespace llvm {
template<typename ValueT>
/// 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;
StringMapImpl(unsigned InitSize, unsigned ItemSize);
void RehashTable();
- /// ShouldRehash - Return true if the table should be rehashed after a new
- /// element was recently inserted.
- bool ShouldRehash() const {
- // If the hash table is now more than 3/4 full, or if fewer than 1/8 of
- // the buckets are empty (meaning that many are filled with tombstones),
- // grow the table.
- return NumItems*4 > NumBuckets*3 ||
- NumBuckets-(NumItems+NumTombstones) < NumBuckets/8;
- }
-
/// 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
/// specified bucket will be non-null. Otherwise, it will be null. In either
StringMapEntry(unsigned strLen, const ValueTy &V)
: StringMapEntryBase(strLen), second(V) {}
- StringRef getKey() const {
- return StringRef(getKeyData(), getKeyLength());
+ StringRef getKey() const {
+ return StringRef(getKeyData(), getKeyLength());
}
const ValueTy &getValue() const { return second; }
/// StringMapEntry object.
const char *getKeyData() const {return reinterpret_cast<const char*>(this+1);}
- const char *first() const { return getKeyData(); }
+ StringRef first() const { return StringRef(getKeyData(), getKeyLength()); }
/// Create - Create a StringMapEntry for the specified key and default
/// construct the value.
unsigned AllocSize = static_cast<unsigned>(sizeof(StringMapEntry))+
KeyLength+1;
- unsigned Alignment = alignof<StringMapEntry>();
+ unsigned Alignment = alignOf<StringMapEntry>();
StringMapEntry *NewItem =
static_cast<StringMapEntry*>(Allocator.Allocate(AllocSize,Alignment));
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,
static const StringMapEntry &GetStringMapEntryFromValue(const ValueTy &V) {
return GetStringMapEntryFromValue(const_cast<ValueTy&>(V));
}
-
+
/// GetStringMapEntryFromKeyData - Given key data that is known to be embedded
/// into a StringMapEntry, return the StringMapEntry itself.
static StringMapEntry &GetStringMapEntryFromKeyData(const char *KeyData) {
char *Ptr = const_cast<char*>(KeyData) - sizeof(StringMapEntry<ValueTy>);
return *reinterpret_cast<StringMapEntry*>(Ptr);
}
-
/// Destroy - Destroy this StringMapEntry, releasing memory back to the
/// specified 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(const StringMap &RHS)
+
+ explicit StringMap(AllocatorTy A)
+ : StringMapImpl(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();
}
-
- AllocatorTy &getAllocator() { return Allocator; }
- const AllocatorTy &getAllocator() const { return Allocator; }
+ typedef typename ReferenceAdder<AllocatorTy>::result AllocatorRefTy;
+ typedef typename ReferenceAdder<const AllocatorTy>::result AllocatorCRefTy;
+ AllocatorRefTy getAllocator() { return Allocator; }
+ AllocatorCRefTy 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 ValueTy();
}
- ValueTy& operator[](StringRef Key) {
+ ValueTy &operator[](StringRef Key) {
return GetOrCreateValue(Key).getValue();
}
/// 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);
- if (ShouldRehash())
- RehashTable();
+ RehashTable();
return true;
}
// 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 = 0;
}
}
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>
- StringMapEntry<ValueTy> &GetOrCreateValue(StringRef Key,
- InitTy Val) {
+ 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;
- if (ShouldRehash())
- RehashTable();
+ RehashTable();
return *NewItem;
}
- StringMapEntry<ValueTy> &GetOrCreateValue(StringRef Key) {
+ MapEntryTy &GetOrCreateValue(StringRef Key) {
return GetOrCreateValue(Key, ValueTy());
}
- template <typename InitTy>
- StringMapEntry<ValueTy> &GetOrCreateValue(const char *KeyStart,
- const char *KeyEnd,
- InitTy Val) {
- return GetOrCreateValue(StringRef(KeyStart, KeyEnd - KeyStart), Val);
- }
-
- StringMapEntry<ValueTy> &GetOrCreateValue(const char *KeyStart,
- const char *KeyEnd) {
- return GetOrCreateValue(StringRef(KeyStart, KeyEnd - KeyStart));
- }
-
/// 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) {
template<typename ValueTy>
class StringMapConstIterator {
protected:
- StringMapImpl::ItemBucket *Ptr;
+ StringMapEntryBase **Ptr;
public:
typedef StringMapEntry<ValueTy> value_type;
- explicit StringMapConstIterator(StringMapImpl::ItemBucket *Bucket,
+ 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 == 0 || *Ptr == StringMapImpl::getTombstoneVal())
++Ptr;
}
};
template<typename ValueTy>
class StringMapIterator : public StringMapConstIterator<ValueTy> {
public:
- explicit StringMapIterator(StringMapImpl::ItemBucket *Bucket,
+ 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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