namespace llvm {
-/// ImutKeyValueInfo -Traits class used by ImmutableMap. While both the first and
-/// second elements in a pair are used to generate profile information,
+/// ImutKeyValueInfo -Traits class used by ImmutableMap. While both the first
+/// and second elements in a pair are used to generate profile information,
/// only the first element (the key) is used by isEqual and isLess.
template <typename T, typename S>
struct ImutKeyValueInfo {
typedef const T& key_type_ref;
typedef const S data_type;
typedef const S& data_type_ref;
-
+
static inline key_type_ref KeyOfValue(value_type_ref V) {
return V.first;
}
-
+
+ static inline data_type_ref DataOfValue(value_type_ref V) {
+ return V.second;
+ }
+
static inline bool isEqual(key_type_ref L, key_type_ref R) {
return ImutContainerInfo<T>::isEqual(L,R);
}
-
static inline bool isLess(key_type_ref L, key_type_ref R) {
return ImutContainerInfo<T>::isLess(L,R);
}
-
+
+ static inline bool isDataEqual(data_type_ref L, data_type_ref R) {
+ return ImutContainerInfo<S>::isEqual(L,R);
+ }
+
static inline void Profile(FoldingSetNodeID& ID, value_type_ref V) {
ImutContainerInfo<T>::Profile(ID, V.first);
ImutContainerInfo<S>::Profile(ID, V.second);
}
-};
+};
-
-template <typename KeyT, typename ValT,
+
+template <typename KeyT, typename ValT,
typename ValInfo = ImutKeyValueInfo<KeyT,ValT> >
class ImmutableMap {
+public:
typedef typename ValInfo::value_type value_type;
typedef typename ValInfo::value_type_ref value_type_ref;
typedef typename ValInfo::key_type key_type;
typedef typename ValInfo::key_type_ref key_type_ref;
typedef typename ValInfo::data_type data_type;
typedef typename ValInfo::data_type_ref data_type_ref;
-
-private:
- typedef ImutAVLTree<ValInfo> TreeTy;
+ typedef ImutAVLTree<ValInfo> TreeTy;
+
+protected:
TreeTy* Root;
-
- ImmutableMap(TreeTy* R) : Root(R) {}
-
+
public:
-
+ /// Constructs a map from a pointer to a tree root. In general one
+ /// should use a Factory object to create maps instead of directly
+ /// invoking the constructor, but there are cases where make this
+ /// constructor public is useful.
+ explicit ImmutableMap(const TreeTy* R) : Root(const_cast<TreeTy*>(R)) {}
+
class Factory {
typename TreeTy::Factory F;
-
+ const bool Canonicalize;
+
public:
- Factory() {}
+ Factory(bool canonicalize = true)
+ : Canonicalize(canonicalize) {}
+ Factory(BumpPtrAllocator& Alloc, bool canonicalize = true)
+ : F(Alloc), Canonicalize(canonicalize) {}
+
ImmutableMap GetEmptyMap() { return ImmutableMap(F.GetEmptyTree()); }
-
+
ImmutableMap Add(ImmutableMap Old, key_type_ref K, data_type_ref D) {
- return ImmutableMap(F.Add(Old.Root,
- std::make_pair<key_type,data_type>(K,D)));
+ TreeTy *T = F.Add(Old.Root, std::make_pair<key_type,data_type>(K,D));
+ return ImmutableMap(Canonicalize ? F.GetCanonicalTree(T): T);
}
-
+
ImmutableMap Remove(ImmutableMap Old, key_type_ref K) {
- return ImmutableMap(F.Remove(Old.Root,K));
- }
-
+ TreeTy *T = F.Remove(Old.Root,K);
+ return ImmutableMap(Canonicalize ? F.GetCanonicalTree(T): T);
+ }
+
private:
- Factory(const Factory& RHS) {};
- void operator=(const Factory& RHS) {};
+ Factory(const Factory& RHS); // DO NOT IMPLEMENT
+ void operator=(const Factory& RHS); // DO NOT IMPLEMENT
};
-
- friend class Factory;
-
+
bool contains(key_type_ref K) const {
return Root ? Root->contains(K) : false;
}
-
- data_type* find(key_type_ref K) const {
- if (Root) {
- TreeTy* T = Root->find(K);
- if (T) return &T->getValue().second;
- }
-
- return NULL;
- }
-
+
bool operator==(ImmutableMap RHS) const {
return Root && RHS.Root ? Root->isEqual(*RHS.Root) : Root == RHS.Root;
}
-
+
bool operator!=(ImmutableMap RHS) const {
return Root && RHS.Root ? Root->isNotEqual(*RHS.Root) : Root != RHS.Root;
}
-
+
+ TreeTy* getRoot() const { return Root; }
+
bool isEmpty() const { return !Root; }
- //===--------------------------------------------------===//
+ //===--------------------------------------------------===//
// Foreach - A limited form of map iteration.
//===--------------------------------------------------===//
template <typename Callback>
struct CBWrapper {
Callback C;
- void operator()(value_type_ref V) { C(V.first,V.second); }
- };
-
+ void operator()(value_type_ref V) { C(V.first,V.second); }
+ };
+
template <typename Callback>
struct CBWrapperRef {
Callback &C;
CBWrapperRef(Callback& c) : C(c) {}
-
- void operator()(value_type_ref V) { C(V.first,V.second); }
+
+ void operator()(value_type_ref V) { C(V.first,V.second); }
};
-
-public:
+
+public:
template <typename Callback>
- void foreach(Callback& C) {
- if (Root) {
+ void foreach(Callback& C) {
+ if (Root) {
CBWrapperRef<Callback> CB(C);
Root->foreach(CB);
}
}
-
+
template <typename Callback>
- void foreach() {
+ void foreach() {
if (Root) {
CBWrapper<Callback> CB;
Root->foreach(CB);
}
}
-
- //===--------------------------------------------------===//
+
+ //===--------------------------------------------------===//
// For testing.
- //===--------------------------------------------------===//
-
+ //===--------------------------------------------------===//
+
void verify() const { if (Root) Root->verify(); }
-
- //===--------------------------------------------------===//
+
+ //===--------------------------------------------------===//
// Iterators.
- //===--------------------------------------------------===//
-
+ //===--------------------------------------------------===//
+
class iterator {
typename TreeTy::iterator itr;
-
+
iterator() {}
iterator(TreeTy* t) : itr(t) {}
- friend class ImmutableSet<ValT,ValInfo>;
+ friend class ImmutableMap;
public:
- inline value_type_ref operator*() const { return itr->getValue(); }
- inline key_type_ref getKey() const { return itr->getValue().first; }
- inline data_type_ref getData() const { return itr->getValue().second; }
-
- inline iterator& operator++() { ++itr; return *this; }
- inline iterator operator++(int) { iterator tmp(*this); ++itr; return tmp; }
- inline iterator& operator--() { --itr; return *this; }
- inline iterator operator--(int) { iterator tmp(*this); --itr; return tmp; }
- inline bool operator==(const iterator& RHS) const { return RHS.itr == itr; }
- inline bool operator!=(const iterator& RHS) const { return RHS.itr != itr; }
+ value_type_ref operator*() const { return itr->getValue(); }
+ value_type* operator->() const { return &itr->getValue(); }
+
+ key_type_ref getKey() const { return itr->getValue().first; }
+ data_type_ref getData() const { return itr->getValue().second; }
+
+
+ iterator& operator++() { ++itr; return *this; }
+ iterator operator++(int) { iterator tmp(*this); ++itr; return tmp; }
+ iterator& operator--() { --itr; return *this; }
+ iterator operator--(int) { iterator tmp(*this); --itr; return tmp; }
+ bool operator==(const iterator& RHS) const { return RHS.itr == itr; }
+ bool operator!=(const iterator& RHS) const { return RHS.itr != itr; }
};
-
+
iterator begin() const { return iterator(Root); }
- iterator end() const { return iterator(); }
+ iterator end() const { return iterator(); }
+
+ data_type* lookup(key_type_ref K) const {
+ if (Root) {
+ TreeTy* T = Root->find(K);
+ if (T) return &T->getValue().second;
+ }
+
+ return 0;
+ }
- //===--------------------------------------------------===//
+ /// getMaxElement - Returns the <key,value> pair in the ImmutableMap for
+ /// which key is the highest in the ordering of keys in the map. This
+ /// method returns NULL if the map is empty.
+ value_type* getMaxElement() const {
+ return Root ? &(Root->getMaxElement()->getValue()) : 0;
+ }
+
+ //===--------------------------------------------------===//
// Utility methods.
- //===--------------------------------------------------===//
-
- inline unsigned getHeight() const { return Root ? Root->getHeight() : 0; }
+ //===--------------------------------------------------===//
- static inline void Profile(FoldingSetNodeID& ID, const ImmutableMap& M) {
+ unsigned getHeight() const { return Root ? Root->getHeight() : 0; }
+
+ static inline void Profile(FoldingSetNodeID& ID, const ImmutableMap& M) {
ID.AddPointer(M.Root);
}
-
+
inline void Profile(FoldingSetNodeID& ID) const {
return Profile(ID,*this);
- }
+ }
};
-
+
} // end namespace llvm
#endif
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