//
// The LLVM Compiler Infrastructure
//
-// This file was developed by Chris Lattner and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
#include "llvm/Support/Allocator.h"
#include <cstring>
+#include <string>
namespace llvm {
template<typename ValueT>
class StringMapConstIterator;
template<typename ValueT>
class StringMapIterator;
+ 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) {
+ }
+};
+
-
/// StringMapEntryBase - Shared base class of StringMapEntry instances.
class StringMapEntryBase {
unsigned StrLen;
public:
- StringMapEntryBase(unsigned Len) : StrLen(Len) {}
-
+ explicit StringMapEntryBase(unsigned Len) : StrLen(Len) {}
+
unsigned getKeyLength() const { return StrLen; }
};
-
-/// StringMapVisitor - Subclasses of this class may be implemented to walk all
-/// of the items in a StringMap.
-class StringMapVisitor {
-public:
- virtual ~StringMapVisitor();
- virtual void Visit(const char *Key, StringMapEntryBase *Value) const = 0;
-};
/// StringMapImpl - This is the base class of StringMap that is shared among
/// all of its instantiations.
/// 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;
unsigned NumBuckets;
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;
+ }
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
/// case, the FullHashValue field of the bucket will be set to the hash value
/// of the string.
unsigned LookupBucketFor(const char *KeyStart, const char *KeyEnd);
-
+
+ /// FindKey - Look up the bucket that contains the specified key. If it exists
+ /// in the map, return the bucket number of the key. Otherwise return -1.
+ /// This does not modify the map.
+ int FindKey(const char *KeyStart, const char *KeyEnd) const;
+
+ /// RemoveKey - Remove the specified StringMapEntry from the table, but do not
+ /// delete it. This aborts if the value isn't in the table.
+ void RemoveKey(StringMapEntryBase *V);
+
+ /// 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(const char *KeyStart, const char *KeyEnd);
+private:
+ void init(unsigned Size);
public:
static StringMapEntryBase *getTombstoneVal() {
return (StringMapEntryBase*)-1;
}
-
+
unsigned getNumBuckets() const { return NumBuckets; }
unsigned getNumItems() const { return NumItems; }
bool empty() const { return NumItems == 0; }
unsigned size() const { return NumItems; }
-
- void VisitEntries(const StringMapVisitor &Visitor) const;
};
/// StringMapEntry - This is used to represent one value that is inserted into
/// and data.
template<typename ValueTy>
class StringMapEntry : public StringMapEntryBase {
- ValueTy Val;
public:
- StringMapEntry(unsigned StrLen)
- : StringMapEntryBase(StrLen), Val() {}
- StringMapEntry(unsigned StrLen, const ValueTy &V)
- : StringMapEntryBase(StrLen), Val(V) {}
-
- const ValueTy &getValue() const { return Val; }
- ValueTy &getValue() { return Val; }
-
- void setValue(const ValueTy &V) { Val = V; }
-
+ ValueTy second;
+
+ explicit StringMapEntry(unsigned strLen)
+ : StringMapEntryBase(strLen), second() {}
+ StringMapEntry(unsigned strLen, const ValueTy &V)
+ : StringMapEntryBase(strLen), second(V) {}
+
+ const ValueTy &getValue() const { return second; }
+ ValueTy &getValue() { return second; }
+
+ void setValue(const ValueTy &V) { second = V; }
+
/// getKeyData - Return the start of the string data that is the key for this
/// value. The string data is always stored immediately after the
/// StringMapEntry object.
const char *getKeyData() const {return reinterpret_cast<const char*>(this+1);}
-
+
+ const char *first() const { return getKeyData(); }
+
/// Create - Create a StringMapEntry for the specified key and default
/// construct the value.
- template<typename AllocatorTy>
+ template<typename AllocatorTy, typename InitType>
static StringMapEntry *Create(const char *KeyStart, const char *KeyEnd,
- AllocatorTy &Allocator) {
- unsigned KeyLength = KeyEnd-KeyStart;
-
+ AllocatorTy &Allocator,
+ 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
// terminator.
- unsigned AllocSize = sizeof(StringMapEntry)+KeyLength+1;
-
-#ifdef __GNUC__
- unsigned Alignment = __alignof__(StringMapEntry);
-#else
- // FIXME: ugly.
- unsigned Alignment = 8;
-#endif
- StringMapEntry *NewItem =
- static_cast<StringMapEntry*>(Allocator.Allocate(AllocSize, Alignment));
-
+
+ unsigned AllocSize = static_cast<unsigned>(sizeof(StringMapEntry))+
+ KeyLength+1;
+ unsigned Alignment = alignof<StringMapEntry>();
+
+ StringMapEntry *NewItem =
+ static_cast<StringMapEntry*>(Allocator.Allocate(AllocSize,Alignment));
+
// Default construct the value.
new (NewItem) StringMapEntry(KeyLength);
-
+
// 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;
}
-
+
+ template<typename AllocatorTy>
+ static StringMapEntry *Create(const char *KeyStart, const char *KeyEnd,
+ AllocatorTy &Allocator) {
+ return Create(KeyStart, KeyEnd, Allocator, (void*)0);
+ }
+
+
/// Create - Create a StringMapEntry with normal malloc/free.
- static StringMapEntry *Create(const char *KeyStart, const char *KeyEnd) {
+ template<typename InitType>
+ static StringMapEntry *Create(const char *KeyStart, const char *KeyEnd,
+ InitType InitVal) {
MallocAllocator A;
- return Create(KeyStart, KeyEnd, A);
+ return Create(KeyStart, KeyEnd, A, InitVal);
+ }
+
+ static StringMapEntry *Create(const char *KeyStart, const char *KeyEnd) {
+ return Create(KeyStart, KeyEnd, (void*)0);
+ }
+
+ /// 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));
}
/// Destroy - Destroy this StringMapEntry, releasing memory back to the
this->~StringMapEntry();
Allocator.Deallocate(this);
}
-
+
/// Destroy this object, releasing memory back to the malloc allocator.
void Destroy() {
MallocAllocator A;
AllocatorTy Allocator;
typedef StringMapEntry<ValueTy> MapEntryTy;
public:
- StringMap(unsigned InitialSize = 0)
- : StringMapImpl(InitialSize, sizeof(MapEntryTy)) {}
-
+ StringMap() : StringMapImpl(static_cast<unsigned>(sizeof(MapEntryTy))) {}
+ explicit StringMap(unsigned InitialSize)
+ : StringMapImpl(InitialSize, static_cast<unsigned>(sizeof(MapEntryTy))) {}
+
AllocatorTy &getAllocator() { return Allocator; }
const AllocatorTy &getAllocator() const { return Allocator; }
+ typedef const char* key_type;
+ typedef ValueTy mapped_type;
+ typedef StringMapEntry<ValueTy> value_type;
+ typedef size_t size_type;
+
typedef StringMapConstIterator<ValueTy> const_iterator;
typedef StringMapIterator<ValueTy> iterator;
-
- iterator begin() { return iterator(TheTable); }
- iterator end() { return iterator(TheTable+NumBuckets); }
- const_iterator begin() const { return const_iterator(TheTable); }
- const_iterator end() const { return const_iterator(TheTable+NumBuckets); }
-
- /// FindValue - Look up the specified key in the map. If it exists, return a
- /// pointer to the element, otherwise return null.
- MapEntryTy *FindValue(const char *KeyStart, const char *KeyEnd) {
- unsigned BucketNo = LookupBucketFor(KeyStart, KeyEnd);
- return static_cast<MapEntryTy*>(TheTable[BucketNo].Item);
+
+ iterator begin() {
+ return iterator(TheTable, NumBuckets == 0);
+ }
+ iterator end() {
+ return iterator(TheTable+NumBuckets, true);
+ }
+ const_iterator begin() const {
+ return const_iterator(TheTable, NumBuckets == 0);
+ }
+ const_iterator end() const {
+ return const_iterator(TheTable+NumBuckets, true);
+ }
+
+ iterator find(const char *KeyStart, const char *KeyEnd) {
+ int Bucket = FindKey(KeyStart, KeyEnd);
+ if (Bucket == -1) return end();
+ return iterator(TheTable+Bucket);
+ }
+ iterator find(const char *Key) {
+ return find(Key, Key + strlen(Key));
+ }
+ iterator find(const std::string &Key) {
+ const char* key_start = (Key.empty() ? NULL : &Key[0]);
+ return find(key_start, key_start + Key.size());
+ }
+
+ const_iterator find(const char *KeyStart, const char *KeyEnd) const {
+ int Bucket = FindKey(KeyStart, KeyEnd);
+ if (Bucket == -1) return end();
+ return const_iterator(TheTable+Bucket);
+ }
+ const_iterator find(const char *Key) const {
+ return find(Key, Key + strlen(Key));
+ }
+ const_iterator find(const std::string &Key) const {
+ const char* key_start = (Key.empty() ? NULL : &Key[0]);
+ return find(key_start, key_start + Key.size());
+ }
+
+ ValueTy& operator[](const char *Key) {
+ value_type& entry = GetOrCreateValue(Key, Key + strlen(Key));
+ return entry.getValue();
}
-
+ ValueTy& operator[](const std::string &Key) {
+ const char* key_start = (Key.empty() ? NULL : &Key[0]);
+ value_type& entry = GetOrCreateValue(key_start, key_start + Key.size());
+ return entry.getValue();
+ }
+
+ size_type count(const char *KeyStart, const char *KeyEnd) const {
+ return find(KeyStart, KeyEnd) == end() ? 0 : 1;
+ }
+ size_type count(const char *Key) const {
+ return count(Key, Key + strlen(Key));
+ }
+ size_type count(const std::string &Key) const {
+ const char* key_start = (Key.empty() ? NULL : &Key[0]);
+ return count(key_start, key_start + Key.size());
+ }
+
+ /// insert - Insert the specified key/value pair into the map. If the key
+ /// already exists in the map, return false and ignore the request, otherwise
+ /// insert it and return true.
+ bool insert(MapEntryTy *KeyValue) {
+ unsigned BucketNo =
+ LookupBucketFor(KeyValue->getKeyData(),
+ KeyValue->getKeyData()+KeyValue->getKeyLength());
+ ItemBucket &Bucket = TheTable[BucketNo];
+ if (Bucket.Item && Bucket.Item != getTombstoneVal())
+ return false; // Already exists in map.
+
+ if (Bucket.Item == getTombstoneVal())
+ --NumTombstones;
+ Bucket.Item = KeyValue;
+ ++NumItems;
+
+ if (ShouldRehash())
+ RehashTable();
+ return true;
+ }
+
/// GetOrCreateValue - Look up the specified key in the table. If a value
/// exists, return it. Otherwise, default construct a value, insert it, and
/// return.
- StringMapEntry<ValueTy> &GetOrCreateValue(const char *KeyStart,
- const char *KeyEnd) {
+ template <typename InitTy>
+ StringMapEntry<ValueTy> &GetOrCreateValue(const char *KeyStart,
+ const char *KeyEnd,
+ InitTy Val) {
unsigned BucketNo = LookupBucketFor(KeyStart, KeyEnd);
ItemBucket &Bucket = TheTable[BucketNo];
- if (Bucket.Item)
+ if (Bucket.Item && Bucket.Item != getTombstoneVal())
return *static_cast<MapEntryTy*>(Bucket.Item);
-
- MapEntryTy *NewItem = MapEntryTy::Create(KeyStart, KeyEnd, Allocator);
+
+ MapEntryTy *NewItem = MapEntryTy::Create(KeyStart, KeyEnd, Allocator, Val);
+
+ if (Bucket.Item == getTombstoneVal())
+ --NumTombstones;
++NumItems;
-
+
// Fill in the bucket for the hash table. The FullHashValue was already
// filled in by LookupBucketFor.
Bucket.Item = NewItem;
-
- // If the hash table is now more than 3/4 full, rehash into a larger table.
- if (NumItems > NumBuckets*3/4)
+
+ if (ShouldRehash())
RehashTable();
return *NewItem;
}
-
+
+ StringMapEntry<ValueTy> &GetOrCreateValue(const char *KeyStart,
+ const char *KeyEnd) {
+ return GetOrCreateValue(KeyStart, KeyEnd, (void*)0);
+ }
+
+ /// 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) {
+ RemoveKey(KeyValue);
+ }
+
+ void erase(iterator I) {
+ MapEntryTy &V = *I;
+ remove(&V);
+ V.Destroy(Allocator);
+ }
+
+ bool erase(const char *Key) {
+ iterator I = find(Key);
+ if (I == end()) return false;
+ erase(I);
+ return true;
+ }
+
+ bool erase(const std::string &Key) {
+ iterator I = find(Key);
+ if (I == end()) return false;
+ erase(I);
+ return true;
+ }
+
~StringMap() {
for (ItemBucket *I = TheTable, *E = TheTable+NumBuckets; I != E; ++I) {
- if (MapEntryTy *Id = static_cast<MapEntryTy*>(I->Item))
- Id->Destroy(Allocator);
+ if (I->Item && I->Item != getTombstoneVal())
+ static_cast<MapEntryTy*>(I->Item)->Destroy(Allocator);
}
- delete [] TheTable;
+ free(TheTable);
}
+private:
+ StringMap(const StringMap &); // FIXME: Implement.
+ void operator=(const StringMap &); // FIXME: Implement.
};
-
+
template<typename ValueTy>
class StringMapConstIterator {
+protected:
StringMapImpl::ItemBucket *Ptr;
public:
- StringMapConstIterator(StringMapImpl::ItemBucket *Bucket) : Ptr(Bucket) {
- AdvancePastEmptyBuckets();
+ explicit StringMapConstIterator(StringMapImpl::ItemBucket *Bucket,
+ bool NoAdvance = false)
+ : Ptr(Bucket) {
+ if (!NoAdvance) AdvancePastEmptyBuckets();
}
-
+
const StringMapEntry<ValueTy> &operator*() const {
return *static_cast<StringMapEntry<ValueTy>*>(Ptr->Item);
}
const StringMapEntry<ValueTy> *operator->() const {
return static_cast<StringMapEntry<ValueTy>*>(Ptr->Item);
}
-
+
bool operator==(const StringMapConstIterator &RHS) const {
return Ptr == RHS.Ptr;
}
bool operator!=(const StringMapConstIterator &RHS) const {
return Ptr != RHS.Ptr;
}
-
+
inline StringMapConstIterator& operator++() { // Preincrement
++Ptr;
AdvancePastEmptyBuckets();
StringMapConstIterator operator++(int) { // Postincrement
StringMapConstIterator tmp = *this; ++*this; return tmp;
}
-
+
private:
void AdvancePastEmptyBuckets() {
while (Ptr->Item == 0 || Ptr->Item == StringMapImpl::getTombstoneVal())
template<typename ValueTy>
class StringMapIterator : public StringMapConstIterator<ValueTy> {
-public:
- StringMapIterator(StringMapImpl::ItemBucket *Bucket)
- : StringMapConstIterator<ValueTy>(Bucket) {
+public:
+ explicit StringMapIterator(StringMapImpl::ItemBucket *Bucket,
+ bool NoAdvance = false)
+ : StringMapConstIterator<ValueTy>(Bucket, NoAdvance) {
}
StringMapEntry<ValueTy> &operator*() const {
return *static_cast<StringMapEntry<ValueTy>*>(this->Ptr->Item);
}
#endif
-
projects / oota-llvm.git / blobdiff