llvm-6502/include/llvm/ADT/ImmutableMap.h
2010-02-02 01:57:01 +00:00

231 lines
6.8 KiB
C++

//===--- ImmutableMap.h - Immutable (functional) map interface --*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the ImmutableMap class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_ADT_IMMAP_H
#define LLVM_ADT_IMMAP_H
#include "llvm/ADT/ImmutableSet.h"
namespace llvm {
/// 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 std::pair<T,S> value_type;
typedef const value_type& value_type_ref;
typedef const T key_type;
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,
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;
typedef ImutAVLTree<ValInfo> TreeTy;
protected:
TreeTy* Root;
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(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) {
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) {
TreeTy *T = F.Remove(Old.Root,K);
return ImmutableMap(Canonicalize ? F.GetCanonicalTree(T): T);
}
private:
Factory(const Factory& RHS); // DO NOT IMPLEMENT
void operator=(const Factory& RHS); // DO NOT IMPLEMENT
};
bool contains(key_type_ref K) const {
return Root ? Root->contains(K) : false;
}
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.
//===--------------------------------------------------===//
private:
template <typename Callback>
struct CBWrapper {
Callback C;
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); }
};
public:
template <typename Callback>
void foreach(Callback& C) {
if (Root) {
CBWrapperRef<Callback> CB(C);
Root->foreach(CB);
}
}
template <typename Callback>
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 ImmutableMap;
public:
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(); }
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.
//===--------------------------------------------------===//
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