//
//===----------------------------------------------------------------------===//
-#ifndef LLVM_ADT_IMSET_H
-#define LLVM_ADT_IMSET_H
+#ifndef LLVM_ADT_IMMUTABLESET_H
+#define LLVM_ADT_IMMUTABLESET_H
-#include "llvm/Support/Allocator.h"
+#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/FoldingSet.h"
-#include "llvm/System/DataTypes.h"
+#include "llvm/Support/Allocator.h"
+#include "llvm/Support/DataTypes.h"
+#include "llvm/Support/ErrorHandling.h"
#include <cassert>
#include <functional>
+#include <vector>
namespace llvm {
template <typename ImutInfo> class ImutAVLTreeGenericIterator;
template <typename ImutInfo >
-class ImutAVLTree : public FoldingSetNode {
+class ImutAVLTree {
public:
typedef typename ImutInfo::key_type_ref key_type_ref;
typedef typename ImutInfo::value_type value_type;
friend class ImutIntervalAVLFactory<ImutInfo>;
friend class ImutAVLTreeGenericIterator<ImutInfo>;
- friend class FoldingSet<ImutAVLTree>;
typedef ImutAVLTreeInOrderIterator<ImutInfo> iterator;
// Public Interface.
//===----------------------------------------------------===//
- /// getLeft - Returns a pointer to the left subtree. This value
+ /// Return a pointer to the left subtree. This value
/// is NULL if there is no left subtree.
ImutAVLTree *getLeft() const { return left; }
- /// getRight - Returns a pointer to the right subtree. This value is
+ /// Return a pointer to the right subtree. This value is
/// NULL if there is no right subtree.
ImutAVLTree *getRight() const { return right; }
else
T = T->getRight();
}
- return NULL;
+ return nullptr;
}
-
+
/// getMaxElement - Find the subtree associated with the highest ranged
/// key value.
ImutAVLTree* getMaxElement() {
ImutAVLTree *T = this;
- ImutAVLTree *Right = T->getRight();
- while (Right) { T = right; right = T->getRight(); }
+ ImutAVLTree *Right = T->getRight();
+ while (Right) { T = Right; Right = T->getRight(); }
return T;
}
iterator RItr = RHS.begin(), REnd = RHS.end();
while (LItr != LEnd && RItr != REnd) {
- if (*LItr == *RItr) {
+ if (&*LItr == &*RItr) {
LItr.skipSubTree();
RItr.skipSubTree();
continue;
}
- if (!LItr->isElementEqual(*RItr))
+ if (!LItr->isElementEqual(&*RItr))
return false;
++LItr;
return getHeight();
}
- /// Profile - Profiling for ImutAVLTree.
- void Profile(llvm::FoldingSetNodeID& ID) {
- ID.AddInteger(computeDigest());
- }
-
//===----------------------------------------------------===//
// Internal values.
//===----------------------------------------------------===//
private:
- ImutAVLTree* left;
- ImutAVLTree* right;
- unsigned height : 28;
- unsigned IsMutable : 1;
- unsigned IsDigestCached : 1;
- value_type value;
- uint32_t digest;
+ Factory *factory;
+ ImutAVLTree *left;
+ ImutAVLTree *right;
+ ImutAVLTree *prev;
+ ImutAVLTree *next;
+
+ unsigned height : 28;
+ unsigned IsMutable : 1;
+ unsigned IsDigestCached : 1;
+ unsigned IsCanonicalized : 1;
+
+ value_type value;
+ uint32_t digest;
+ uint32_t refCount;
//===----------------------------------------------------===//
// Internal methods (node manipulation; used by Factory).
private:
/// ImutAVLTree - Internal constructor that is only called by
/// ImutAVLFactory.
- ImutAVLTree(ImutAVLTree* l, ImutAVLTree* r, value_type_ref v,
+ ImutAVLTree(Factory *f, ImutAVLTree* l, ImutAVLTree* r, value_type_ref v,
unsigned height)
- : left(l), right(r), height(height), IsMutable(true),
- IsDigestCached(false), value(v), digest(0) {}
+ : factory(f), left(l), right(r), prev(nullptr), next(nullptr),
+ height(height), IsMutable(true), IsDigestCached(false),
+ IsCanonicalized(0), value(v), digest(0), refCount(0)
+ {
+ if (left) left->retain();
+ if (right) right->retain();
+ }
/// isMutable - Returns true if the left and right subtree references
/// (as well as height) can be changed. If this method returns false,
/// method returns false for an instance of ImutAVLTree, all subtrees
/// will also have this method return false. The converse is not true.
bool isMutable() const { return IsMutable; }
-
+
/// hasCachedDigest - Returns true if the digest for this tree is cached.
/// This can only be true if the tree is immutable.
bool hasCachedDigest() const { return IsDigestCached; }
assert(isMutable() && "Mutable flag already removed.");
IsMutable = false;
}
-
+
/// markedCachedDigest - Clears the NoCachedDigest flag for a tree.
void markedCachedDigest() {
assert(!hasCachedDigest() && "NoCachedDigest flag already removed.");
IsDigestCached = true;
}
- /// setLeft - Changes the reference of the left subtree. Used internally
- /// by ImutAVLFactory.
- void setLeft(ImutAVLTree* NewLeft) {
- assert(isMutable() &&
- "Only a mutable tree can have its left subtree changed.");
- left = NewLeft;
- IsDigestCached = false;
- }
-
- /// setRight - Changes the reference of the right subtree. Used internally
- /// by ImutAVLFactory.
- void setRight(ImutAVLTree* newRight) {
- assert(isMutable() &&
- "Only a mutable tree can have its right subtree changed.");
-
- right = newRight;
- IsDigestCached = false;
- }
-
/// setHeight - Changes the height of the tree. Used internally by
/// ImutAVLFactory.
void setHeight(unsigned h) {
height = h;
}
- static inline
- uint32_t computeDigest(ImutAVLTree* L, ImutAVLTree* R, value_type_ref V) {
+ static uint32_t computeDigest(ImutAVLTree *L, ImutAVLTree *R,
+ value_type_ref V) {
uint32_t digest = 0;
if (L)
return digest;
}
- inline uint32_t computeDigest() {
+ uint32_t computeDigest() {
// Check the lowest bit to determine if digest has actually been
// pre-computed.
if (hasCachedDigest())
markedCachedDigest();
return X;
}
+
+ //===----------------------------------------------------===//
+ // Reference count operations.
+ //===----------------------------------------------------===//
+
+public:
+ void retain() { ++refCount; }
+ void release() {
+ assert(refCount > 0);
+ if (--refCount == 0)
+ destroy();
+ }
+ void destroy() {
+ if (left)
+ left->release();
+ if (right)
+ right->release();
+ if (IsCanonicalized) {
+ if (next)
+ next->prev = prev;
+
+ if (prev)
+ prev->next = next;
+ else
+ factory->Cache[factory->maskCacheIndex(computeDigest())] = next;
+ }
+
+ // We need to clear the mutability bit in case we are
+ // destroying the node as part of a sweep in ImutAVLFactory::recoverNodes().
+ IsMutable = false;
+ factory->freeNodes.push_back(this);
+ }
};
//===----------------------------------------------------------------------===//
template <typename ImutInfo >
class ImutAVLFactory {
+ friend class ImutAVLTree<ImutInfo>;
typedef ImutAVLTree<ImutInfo> TreeTy;
typedef typename TreeTy::value_type_ref value_type_ref;
typedef typename TreeTy::key_type_ref key_type_ref;
- typedef FoldingSet<TreeTy> CacheTy;
+ typedef DenseMap<unsigned, TreeTy*> CacheTy;
CacheTy Cache;
uintptr_t Allocator;
+ std::vector<TreeTy*> createdNodes;
+ std::vector<TreeTy*> freeNodes;
bool ownsAllocator() const {
return Allocator & 0x1 ? false : true;
TreeTy* add(TreeTy* T, value_type_ref V) {
T = add_internal(V,T);
markImmutable(T);
+ recoverNodes();
return T;
}
TreeTy* remove(TreeTy* T, key_type_ref V) {
T = remove_internal(V,T);
markImmutable(T);
+ recoverNodes();
return T;
}
- TreeTy* getEmptyTree() const { return NULL; }
+ TreeTy* getEmptyTree() const { return nullptr; }
protected:
-
+
//===--------------------------------------------------===//
// A bunch of quick helper functions used for reasoning
// about the properties of trees and their children.
TreeTy* getRight(TreeTy* T) const { return T->getRight(); }
value_type_ref getValue(TreeTy* T) const { return T->value; }
+ // Make sure the index is not the Tombstone or Entry key of the DenseMap.
+ static unsigned maskCacheIndex(unsigned I) { return (I & ~0x02); }
+
unsigned incrementHeight(TreeTy* L, TreeTy* R) const {
unsigned hl = getHeight(L);
unsigned hr = getHeight(R);
typename TreeTy::iterator& TE) {
typename TreeTy::iterator I = T->begin(), E = T->end();
for ( ; I!=E ; ++I, ++TI) {
- if (TI == TE || !I->isElementEqual(*TI))
+ if (TI == TE || !I->isElementEqual(&*TI))
return false;
}
return true;
// returned to the caller.
//===--------------------------------------------------===//
- TreeTy* createNode(TreeTy* L, value_type_ref V, TreeTy* R) {
+ TreeTy* createNode(TreeTy* L, value_type_ref V, TreeTy* R) {
BumpPtrAllocator& A = getAllocator();
- TreeTy* T = (TreeTy*) A.Allocate<TreeTy>();
- new (T) TreeTy(L, R, V, incrementHeight(L,R));
+ TreeTy* T;
+ if (!freeNodes.empty()) {
+ T = freeNodes.back();
+ freeNodes.pop_back();
+ assert(T != L);
+ assert(T != R);
+ } else {
+ T = (TreeTy*) A.Allocate<TreeTy>();
+ }
+ new (T) TreeTy(this, L, R, V, incrementHeight(L,R));
+ createdNodes.push_back(T);
return T;
}
TreeTy* createNode(TreeTy* newLeft, TreeTy* oldTree, TreeTy* newRight) {
- assert(!isEmpty(oldTree));
- if (oldTree->isMutable()) {
- oldTree->setLeft(newLeft);
- oldTree->setRight(newRight);
- oldTree->setHeight(incrementHeight(newLeft, newRight));
- return oldTree;
+ return createNode(newLeft, getValue(oldTree), newRight);
+ }
+
+ void recoverNodes() {
+ for (unsigned i = 0, n = createdNodes.size(); i < n; ++i) {
+ TreeTy *N = createdNodes[i];
+ if (N->isMutable() && N->refCount == 0)
+ N->destroy();
}
- else
- return createNode(newLeft, getValue(oldTree), newRight);
+ createdNodes.clear();
}
/// balanceTree - Used by add_internal and remove_internal to
return createNode(createNode(LL,L,LRL), LR, createNode(LRR,V,R));
}
- else if (hr > hl + 2) {
+
+ if (hr > hl + 2) {
assert(!isEmpty(R) && "Right tree cannot be empty to have a height >= 2");
TreeTy *RL = getLeft(R);
return createNode(createNode(L,V,RLL), RL, createNode(RLR,R,RR));
}
- else
- return createNode(L,V,R);
+
+ return createNode(L,V,R);
}
/// add_internal - Creates a new tree that includes the specified
markImmutable(getLeft(T));
markImmutable(getRight(T));
}
-
+
public:
TreeTy *getCanonicalTree(TreeTy *TNew) {
if (!TNew)
- return NULL;
-
- // Search the FoldingSet bucket for a Tree with the same digest.
- FoldingSetNodeID ID;
+ return nullptr;
+
+ if (TNew->IsCanonicalized)
+ return TNew;
+
+ // Search the hashtable for another tree with the same digest, and
+ // if find a collision compare those trees by their contents.
unsigned digest = TNew->computeDigest();
- ID.AddInteger(digest);
- unsigned hash = ID.ComputeHash();
-
- typename CacheTy::bucket_iterator I = Cache.bucket_begin(hash);
- typename CacheTy::bucket_iterator E = Cache.bucket_end(hash);
-
- for (; I != E; ++I) {
- TreeTy *T = &*I;
-
- if (T->computeDigest() != digest)
- continue;
-
- // We found a collision. Perform a comparison of Contents('T')
- // with Contents('TNew')
- typename TreeTy::iterator TI = T->begin(), TE = T->end();
-
- if (!compareTreeWithSection(TNew, TI, TE))
- continue;
-
- if (TI != TE)
- continue; // T has more contents than TNew.
-
- // Trees did match! Return 'T'.
- return T;
+ TreeTy *&entry = Cache[maskCacheIndex(digest)];
+ do {
+ if (!entry)
+ break;
+ for (TreeTy *T = entry ; T != nullptr; T = T->next) {
+ // Compare the Contents('T') with Contents('TNew')
+ typename TreeTy::iterator TI = T->begin(), TE = T->end();
+ if (!compareTreeWithSection(TNew, TI, TE))
+ continue;
+ if (TI != TE)
+ continue; // T has more contents than TNew.
+ // Trees did match! Return 'T'.
+ if (TNew->refCount == 0)
+ TNew->destroy();
+ return T;
+ }
+ entry->prev = TNew;
+ TNew->next = entry;
}
+ while (false);
- // 'TNew' is the only tree of its kind. Return it.
- Cache.InsertNode(TNew, (void*) &*Cache.bucket_end(hash));
+ entry = TNew;
+ TNew->IsCanonicalized = true;
return TNew;
}
};
-
//===----------------------------------------------------------------------===//
// Immutable AVL-Tree Iterators.
//===----------------------------------------------------------------------===//
template <typename ImutInfo>
-class ImutAVLTreeGenericIterator {
+class ImutAVLTreeGenericIterator
+ : public std::iterator<std::bidirectional_iterator_tag,
+ ImutAVLTree<ImutInfo>> {
SmallVector<uintptr_t,20> stack;
public:
enum VisitFlag { VisitedNone=0x0, VisitedLeft=0x1, VisitedRight=0x3,
Flags=0x3 };
typedef ImutAVLTree<ImutInfo> TreeTy;
- typedef ImutAVLTreeGenericIterator<ImutInfo> _Self;
- inline ImutAVLTreeGenericIterator() {}
- inline ImutAVLTreeGenericIterator(const TreeTy* Root) {
+ ImutAVLTreeGenericIterator() {}
+ ImutAVLTreeGenericIterator(const TreeTy *Root) {
if (Root) stack.push_back(reinterpret_cast<uintptr_t>(Root));
}
- TreeTy* operator*() const {
+ TreeTy &operator*() const {
assert(!stack.empty());
- return reinterpret_cast<TreeTy*>(stack.back() & ~Flags);
+ return *reinterpret_cast<TreeTy *>(stack.back() & ~Flags);
}
+ TreeTy *operator->() const { return &*this; }
- uintptr_t getVisitState() {
+ uintptr_t getVisitState() const {
assert(!stack.empty());
return stack.back() & Flags;
}
stack.back() |= VisitedRight;
break;
default:
- assert(false && "Unreachable.");
+ llvm_unreachable("Unreachable.");
}
}
- inline bool operator==(const _Self& x) const {
- if (stack.size() != x.stack.size())
- return false;
- for (unsigned i = 0 ; i < stack.size(); i++)
- if (stack[i] != x.stack[i])
- return false;
- return true;
+ bool operator==(const ImutAVLTreeGenericIterator &x) const {
+ return stack == x.stack;
}
- inline bool operator!=(const _Self& x) const { return !operator==(x); }
+ bool operator!=(const ImutAVLTreeGenericIterator &x) const {
+ return !(*this == x);
+ }
- _Self& operator++() {
+ ImutAVLTreeGenericIterator &operator++() {
assert(!stack.empty());
TreeTy* Current = reinterpret_cast<TreeTy*>(stack.back() & ~Flags);
assert(Current);
skipToParent();
break;
default:
- assert(false && "Unreachable.");
+ llvm_unreachable("Unreachable.");
}
return *this;
}
- _Self& operator--() {
+ ImutAVLTreeGenericIterator &operator--() {
assert(!stack.empty());
TreeTy* Current = reinterpret_cast<TreeTy*>(stack.back() & ~Flags);
assert(Current);
stack.push_back(reinterpret_cast<uintptr_t>(R) | VisitedRight);
break;
default:
- assert(false && "Unreachable.");
+ llvm_unreachable("Unreachable.");
}
return *this;
}
};
template <typename ImutInfo>
-class ImutAVLTreeInOrderIterator {
+class ImutAVLTreeInOrderIterator
+ : public std::iterator<std::bidirectional_iterator_tag,
+ ImutAVLTree<ImutInfo>> {
typedef ImutAVLTreeGenericIterator<ImutInfo> InternalIteratorTy;
InternalIteratorTy InternalItr;
public:
typedef ImutAVLTree<ImutInfo> TreeTy;
- typedef ImutAVLTreeInOrderIterator<ImutInfo> _Self;
ImutAVLTreeInOrderIterator(const TreeTy* Root) : InternalItr(Root) {
- if (Root) operator++(); // Advance to first element.
+ if (Root)
+ ++*this; // Advance to first element.
}
ImutAVLTreeInOrderIterator() : InternalItr() {}
- inline bool operator==(const _Self& x) const {
+ bool operator==(const ImutAVLTreeInOrderIterator &x) const {
return InternalItr == x.InternalItr;
}
- inline bool operator!=(const _Self& x) const { return !operator==(x); }
+ bool operator!=(const ImutAVLTreeInOrderIterator &x) const {
+ return !(*this == x);
+ }
- inline TreeTy* operator*() const { return *InternalItr; }
- inline TreeTy* operator->() const { return *InternalItr; }
+ TreeTy &operator*() const { return *InternalItr; }
+ TreeTy *operator->() const { return &*InternalItr; }
- inline _Self& operator++() {
+ ImutAVLTreeInOrderIterator &operator++() {
do ++InternalItr;
while (!InternalItr.atEnd() &&
InternalItr.getVisitState() != InternalIteratorTy::VisitedLeft);
return *this;
}
- inline _Self& operator--() {
+ ImutAVLTreeInOrderIterator &operator--() {
do --InternalItr;
while (!InternalItr.atBeginning() &&
InternalItr.getVisitState() != InternalIteratorTy::VisitedLeft);
return *this;
}
- inline void skipSubTree() {
+ void skipSubTree() {
InternalItr.skipToParent();
while (!InternalItr.atEnd() &&
}
};
+/// Generic iterator that wraps a T::TreeTy::iterator and exposes
+/// iterator::getValue() on dereference.
+template <typename T>
+struct ImutAVLValueIterator
+ : iterator_adaptor_base<
+ ImutAVLValueIterator<T>, typename T::TreeTy::iterator,
+ typename std::iterator_traits<
+ typename T::TreeTy::iterator>::iterator_category,
+ const typename T::value_type> {
+ ImutAVLValueIterator() = default;
+ explicit ImutAVLValueIterator(typename T::TreeTy *Tree)
+ : ImutAVLValueIterator::iterator_adaptor_base(Tree) {}
+
+ typename ImutAVLValueIterator::reference operator*() const {
+ return this->I->getValue();
+ }
+};
+
//===----------------------------------------------------------------------===//
// Trait classes for Profile information.
//===----------------------------------------------------------------------===//
typedef const T value_type;
typedef const T& value_type_ref;
- static inline void Profile(FoldingSetNodeID& ID, value_type_ref X) {
+ static void Profile(FoldingSetNodeID &ID, value_type_ref X) {
FoldingSetTrait<T>::Profile(X,ID);
}
};
typedef const T value_type;
typedef const T& value_type_ref;
- static inline void Profile(FoldingSetNodeID& ID, value_type_ref X) {
+ static void Profile(FoldingSetNodeID &ID, value_type_ref X) {
ID.AddInteger(X);
}
};
#undef PROFILE_INTEGER_INFO
+/// Profile traits for booleans.
+template <>
+struct ImutProfileInfo<bool> {
+ typedef const bool value_type;
+ typedef const bool& value_type_ref;
+
+ static void Profile(FoldingSetNodeID &ID, value_type_ref X) {
+ ID.AddBoolean(X);
+ }
+};
+
+
/// Generic profile trait for pointer types. We treat pointers as
/// references to unique objects.
template <typename T>
typedef const T* value_type;
typedef value_type value_type_ref;
- static inline void Profile(FoldingSetNodeID &ID, value_type_ref X) {
+ static void Profile(FoldingSetNodeID &ID, value_type_ref X) {
ID.AddPointer(X);
}
};
typedef bool data_type;
typedef bool data_type_ref;
- static inline key_type_ref KeyOfValue(value_type_ref D) { return D; }
- static inline data_type_ref DataOfValue(value_type_ref) { return true; }
+ static key_type_ref KeyOfValue(value_type_ref D) { return D; }
+ static data_type_ref DataOfValue(value_type_ref) { return true; }
- static inline bool isEqual(key_type_ref LHS, key_type_ref RHS) {
+ static bool isEqual(key_type_ref LHS, key_type_ref RHS) {
return std::equal_to<key_type>()(LHS,RHS);
}
- static inline bool isLess(key_type_ref LHS, key_type_ref RHS) {
+ static bool isLess(key_type_ref LHS, key_type_ref RHS) {
return std::less<key_type>()(LHS,RHS);
}
- static inline bool isDataEqual(data_type_ref,data_type_ref) { return true; }
+ static bool isDataEqual(data_type_ref, data_type_ref) { return true; }
};
/// ImutContainerInfo - Specialization for pointer values to treat pointers
typedef bool data_type;
typedef bool data_type_ref;
- static inline key_type_ref KeyOfValue(value_type_ref D) { return D; }
- static inline data_type_ref DataOfValue(value_type_ref) { return true; }
+ static key_type_ref KeyOfValue(value_type_ref D) { return D; }
+ static data_type_ref DataOfValue(value_type_ref) { return true; }
- static inline bool isEqual(key_type_ref LHS, key_type_ref RHS) {
- return LHS == RHS;
- }
+ static bool isEqual(key_type_ref LHS, key_type_ref RHS) { return LHS == RHS; }
- static inline bool isLess(key_type_ref LHS, key_type_ref RHS) {
- return LHS < RHS;
- }
+ static bool isLess(key_type_ref LHS, key_type_ref RHS) { return LHS < RHS; }
- static inline bool isDataEqual(data_type_ref,data_type_ref) { return true; }
+ static bool isDataEqual(data_type_ref, data_type_ref) { return true; }
};
//===----------------------------------------------------------------------===//
private:
TreeTy *Root;
-
+
public:
/// Constructs a set from a pointer to a tree root. In general one
/// should use a Factory object to create sets instead of directly
/// invoking the constructor, but there are cases where make this
/// constructor public is useful.
- explicit ImmutableSet(TreeTy* R) : Root(R) {}
+ explicit ImmutableSet(TreeTy* R) : Root(R) {
+ if (Root) { Root->retain(); }
+ }
+ ImmutableSet(const ImmutableSet &X) : Root(X.Root) {
+ if (Root) { Root->retain(); }
+ }
+ ImmutableSet &operator=(const ImmutableSet &X) {
+ if (Root != X.Root) {
+ if (X.Root) { X.Root->retain(); }
+ if (Root) { Root->release(); }
+ Root = X.Root;
+ }
+ return *this;
+ }
+ ~ImmutableSet() {
+ if (Root) { Root->release(); }
+ }
class Factory {
typename TreeTy::Factory F;
BumpPtrAllocator& getAllocator() { return F.getAllocator(); }
+ typename TreeTy::Factory *getTreeFactory() const {
+ return const_cast<typename TreeTy::Factory *>(&F);
+ }
+
private:
- Factory(const Factory& RHS); // DO NOT IMPLEMENT
- void operator=(const Factory& RHS); // DO NOT IMPLEMENT
+ Factory(const Factory& RHS) = delete;
+ void operator=(const Factory& RHS) = delete;
};
friend class Factory;
- /// contains - Returns true if the set contains the specified value.
+ /// Returns true if the set contains the specified value.
bool contains(value_type_ref V) const {
return Root ? Root->contains(V) : false;
}
- bool operator==(ImmutableSet RHS) const {
+ bool operator==(const ImmutableSet &RHS) const {
return Root && RHS.Root ? Root->isEqual(*RHS.Root) : Root == RHS.Root;
}
- bool operator!=(ImmutableSet RHS) const {
+ bool operator!=(const ImmutableSet &RHS) const {
return Root && RHS.Root ? Root->isNotEqual(*RHS.Root) : Root != RHS.Root;
}
- TreeTy *getRoot() {
+ TreeTy *getRoot() {
+ if (Root) { Root->retain(); }
+ return Root;
+ }
+
+ TreeTy *getRootWithoutRetain() const {
return Root;
}
// Iterators.
//===--------------------------------------------------===//
- class iterator {
- typename TreeTy::iterator itr;
- iterator(TreeTy* t) : itr(t) {}
- friend class ImmutableSet<ValT,ValInfo>;
- public:
- iterator() {}
- inline value_type_ref operator*() const { return itr->getValue(); }
- 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; }
- inline value_type *operator->() const { return &(operator*()); }
- };
+ typedef ImutAVLValueIterator<ImmutableSet> iterator;
iterator begin() const { return iterator(Root); }
iterator end() const { return iterator(); }
unsigned getHeight() const { return Root ? Root->getHeight() : 0; }
- static inline void Profile(FoldingSetNodeID& ID, const ImmutableSet& S) {
+ static void Profile(FoldingSetNodeID &ID, const ImmutableSet &S) {
ID.AddPointer(S.Root);
}
- inline void Profile(FoldingSetNodeID& ID) const {
- return Profile(ID,*this);
+ void Profile(FoldingSetNodeID &ID) const { return Profile(ID, *this); }
+
+ //===--------------------------------------------------===//
+ // For testing.
+ //===--------------------------------------------------===//
+
+ void validateTree() const { if (Root) Root->validateTree(); }
+};
+
+// NOTE: This may some day replace the current ImmutableSet.
+template <typename ValT, typename ValInfo = ImutContainerInfo<ValT> >
+class ImmutableSetRef {
+public:
+ typedef typename ValInfo::value_type value_type;
+ typedef typename ValInfo::value_type_ref value_type_ref;
+ typedef ImutAVLTree<ValInfo> TreeTy;
+ typedef typename TreeTy::Factory FactoryTy;
+
+private:
+ TreeTy *Root;
+ FactoryTy *Factory;
+
+public:
+ /// Constructs a set from a pointer to a tree root. In general one
+ /// should use a Factory object to create sets instead of directly
+ /// invoking the constructor, but there are cases where make this
+ /// constructor public is useful.
+ explicit ImmutableSetRef(TreeTy* R, FactoryTy *F)
+ : Root(R),
+ Factory(F) {
+ if (Root) { Root->retain(); }
+ }
+ ImmutableSetRef(const ImmutableSetRef &X)
+ : Root(X.Root),
+ Factory(X.Factory) {
+ if (Root) { Root->retain(); }
+ }
+ ImmutableSetRef &operator=(const ImmutableSetRef &X) {
+ if (Root != X.Root) {
+ if (X.Root) { X.Root->retain(); }
+ if (Root) { Root->release(); }
+ Root = X.Root;
+ Factory = X.Factory;
+ }
+ return *this;
+ }
+ ~ImmutableSetRef() {
+ if (Root) { Root->release(); }
+ }
+
+ static ImmutableSetRef getEmptySet(FactoryTy *F) {
+ return ImmutableSetRef(0, F);
}
+ ImmutableSetRef add(value_type_ref V) {
+ return ImmutableSetRef(Factory->add(Root, V), Factory);
+ }
+
+ ImmutableSetRef remove(value_type_ref V) {
+ return ImmutableSetRef(Factory->remove(Root, V), Factory);
+ }
+
+ /// Returns true if the set contains the specified value.
+ bool contains(value_type_ref V) const {
+ return Root ? Root->contains(V) : false;
+ }
+
+ ImmutableSet<ValT> asImmutableSet(bool canonicalize = true) const {
+ return ImmutableSet<ValT>(canonicalize ?
+ Factory->getCanonicalTree(Root) : Root);
+ }
+
+ TreeTy *getRootWithoutRetain() const {
+ return Root;
+ }
+
+ bool operator==(const ImmutableSetRef &RHS) const {
+ return Root && RHS.Root ? Root->isEqual(*RHS.Root) : Root == RHS.Root;
+ }
+
+ bool operator!=(const ImmutableSetRef &RHS) const {
+ return Root && RHS.Root ? Root->isNotEqual(*RHS.Root) : Root != RHS.Root;
+ }
+
+ /// isEmpty - Return true if the set contains no elements.
+ bool isEmpty() const { return !Root; }
+
+ /// isSingleton - Return true if the set contains exactly one element.
+ /// This method runs in constant time.
+ bool isSingleton() const { return getHeight() == 1; }
+
+ //===--------------------------------------------------===//
+ // Iterators.
+ //===--------------------------------------------------===//
+
+ typedef ImutAVLValueIterator<ImmutableSetRef> iterator;
+
+ iterator begin() const { return iterator(Root); }
+ iterator end() const { return iterator(); }
+
+ //===--------------------------------------------------===//
+ // Utility methods.
+ //===--------------------------------------------------===//
+
+ unsigned getHeight() const { return Root ? Root->getHeight() : 0; }
+
+ static void Profile(FoldingSetNodeID &ID, const ImmutableSetRef &S) {
+ ID.AddPointer(S.Root);
+ }
+
+ void Profile(FoldingSetNodeID &ID) const { return Profile(ID, *this); }
+
//===--------------------------------------------------===//
// For testing.
//===--------------------------------------------------===//
projects / oota-llvm.git / blobdiff