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llvm-mirror/include/llvm/ADT/ImmutableSet.h
Ted Kremenek bb322e520d Tweak ImmutableMap/ImmutableSet/ImmutableList APIs 
to use lowercase letters for the start of most
method names and to replace some method names
with more descriptive names (e.g., "getLeft()"
instead of "Left()").  No real functionality
change.

llvm-svn: 120070
2010-11-24 00:54:28 +00:00

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//===--- ImmutableSet.h - Immutable (functional) set 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 ImutAVLTree and ImmutableSet classes.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_ADT_IMSET_H
#define LLVM_ADT_IMSET_H
#include "llvm/Support/Allocator.h"
#include "llvm/ADT/FoldingSet.h"
#include "llvm/System/DataTypes.h"
#include <cassert>
#include <functional>
namespace llvm {
//===----------------------------------------------------------------------===//
// Immutable AVL-Tree Definition.
//===----------------------------------------------------------------------===//
template <typename ImutInfo> class ImutAVLFactory;
template <typename ImutInfo> class ImutIntervalAVLFactory;
template <typename ImutInfo> class ImutAVLTreeInOrderIterator;
template <typename ImutInfo> class ImutAVLTreeGenericIterator;
template <typename ImutInfo >
class ImutAVLTree : public FoldingSetNode {
public:
typedef typename ImutInfo::key_type_ref key_type_ref;
typedef typename ImutInfo::value_type value_type;
typedef typename ImutInfo::value_type_ref value_type_ref;
typedef ImutAVLFactory<ImutInfo> Factory;
friend class ImutAVLFactory<ImutInfo>;
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
/// is NULL if there is no left subtree.
ImutAVLTree *getLeft() const { return left; }
/// getRight - Returns a pointer to the right subtree. This value is
/// NULL if there is no right subtree.
ImutAVLTree *getRight() const { return right; }
/// getHeight - Returns the height of the tree. A tree with no subtrees
/// has a height of 1.
unsigned getHeight() const { return height; }
/// getValue - Returns the data value associated with the tree node.
const value_type& getValue() const { return value; }
/// find - Finds the subtree associated with the specified key value.
/// This method returns NULL if no matching subtree is found.
ImutAVLTree* find(key_type_ref K) {
ImutAVLTree *T = this;
while (T) {
key_type_ref CurrentKey = ImutInfo::KeyOfValue(T->getValue());
if (ImutInfo::isEqual(K,CurrentKey))
return T;
else if (ImutInfo::isLess(K,CurrentKey))
T = T->getLeft();
else
T = T->getRight();
}
return NULL;
}
/// 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(); }
return T;
}
/// size - Returns the number of nodes in the tree, which includes
/// both leaves and non-leaf nodes.
unsigned size() const {
unsigned n = 1;
if (const ImutAVLTree* L = getLeft())
n += L->size();
if (const ImutAVLTree* R = getRight())
n += R->size();
return n;
}
/// begin - Returns an iterator that iterates over the nodes of the tree
/// in an inorder traversal. The returned iterator thus refers to the
/// the tree node with the minimum data element.
iterator begin() const { return iterator(this); }
/// end - Returns an iterator for the tree that denotes the end of an
/// inorder traversal.
iterator end() const { return iterator(); }
bool isElementEqual(value_type_ref V) const {
// Compare the keys.
if (!ImutInfo::isEqual(ImutInfo::KeyOfValue(getValue()),
ImutInfo::KeyOfValue(V)))
return false;
// Also compare the data values.
if (!ImutInfo::isDataEqual(ImutInfo::DataOfValue(getValue()),
ImutInfo::DataOfValue(V)))
return false;
return true;
}
bool isElementEqual(const ImutAVLTree* RHS) const {
return isElementEqual(RHS->getValue());
}
/// isEqual - Compares two trees for structural equality and returns true
/// if they are equal. This worst case performance of this operation is
// linear in the sizes of the trees.
bool isEqual(const ImutAVLTree& RHS) const {
if (&RHS == this)
return true;
iterator LItr = begin(), LEnd = end();
iterator RItr = RHS.begin(), REnd = RHS.end();
while (LItr != LEnd && RItr != REnd) {
if (*LItr == *RItr) {
LItr.skipSubTree();
RItr.skipSubTree();
continue;
}
if (!LItr->isElementEqual(*RItr))
return false;
++LItr;
++RItr;
}
return LItr == LEnd && RItr == REnd;
}
/// isNotEqual - Compares two trees for structural inequality. Performance
/// is the same is isEqual.
bool isNotEqual(const ImutAVLTree& RHS) const { return !isEqual(RHS); }
/// contains - Returns true if this tree contains a subtree (node) that
/// has an data element that matches the specified key. Complexity
/// is logarithmic in the size of the tree.
bool contains(key_type_ref K) { return (bool) find(K); }
/// foreach - A member template the accepts invokes operator() on a functor
/// object (specifed by Callback) for every node/subtree in the tree.
/// Nodes are visited using an inorder traversal.
template <typename Callback>
void foreach(Callback& C) {
if (ImutAVLTree* L = getLeft())
L->foreach(C);
C(value);
if (ImutAVLTree* R = getRight())
R->foreach(C);
}
/// validateTree - A utility method that checks that the balancing and
/// ordering invariants of the tree are satisifed. It is a recursive
/// method that returns the height of the tree, which is then consumed
/// by the enclosing validateTree call. External callers should ignore the
/// return value. An invalid tree will cause an assertion to fire in
/// a debug build.
unsigned validateTree() const {
unsigned HL = getLeft() ? getLeft()->validateTree() : 0;
unsigned HR = getRight() ? getRight()->validateTree() : 0;
(void) HL;
(void) HR;
assert(getHeight() == ( HL > HR ? HL : HR ) + 1
&& "Height calculation wrong");
assert((HL > HR ? HL-HR : HR-HL) <= 2
&& "Balancing invariant violated");
assert((!getLeft() ||
ImutInfo::isLess(ImutInfo::KeyOfValue(getLeft()->getValue()),
ImutInfo::KeyOfValue(getValue()))) &&
"Value in left child is not less that current value");
assert(!(getRight() ||
ImutInfo::isLess(ImutInfo::KeyOfValue(getValue()),
ImutInfo::KeyOfValue(getRight()->getValue()))) &&
"Current value is not less that value of right child");
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;
//===----------------------------------------------------===//
// 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,
unsigned height)
: left(l), right(r), height(height), IsMutable(true),
IsDigestCached(false), value(v), digest(0) {}
/// isMutable - Returns true if the left and right subtree references
/// (as well as height) can be changed. If this method returns false,
/// the tree is truly immutable. Trees returned from an ImutAVLFactory
/// object should always have this method return true. Further, if this
/// 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; }
//===----------------------------------------------------===//
// Mutating operations. A tree root can be manipulated as
// long as its reference has not "escaped" from internal
// methods of a factory object (see below). When a tree
// pointer is externally viewable by client code, the
// internal "mutable bit" is cleared to mark the tree
// immutable. Note that a tree that still has its mutable
// bit set may have children (subtrees) that are themselves
// immutable.
//===----------------------------------------------------===//
/// markImmutable - Clears the mutable flag for a tree. After this happens,
/// it is an error to call setLeft(), setRight(), and setHeight().
void markImmutable() {
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) {
assert(isMutable() && "Only a mutable tree can have its height changed.");
height = h;
}
static inline
uint32_t computeDigest(ImutAVLTree* L, ImutAVLTree* R, value_type_ref V) {
uint32_t digest = 0;
if (L)
digest += L->computeDigest();
// Compute digest of stored data.
FoldingSetNodeID ID;
ImutInfo::Profile(ID,V);
digest += ID.ComputeHash();
if (R)
digest += R->computeDigest();
return digest;
}
inline uint32_t computeDigest() {
// Check the lowest bit to determine if digest has actually been
// pre-computed.
if (hasCachedDigest())
return digest;
uint32_t X = computeDigest(getLeft(), getRight(), getValue());
digest = X;
markedCachedDigest();
return X;
}
};
//===----------------------------------------------------------------------===//
// Immutable AVL-Tree Factory class.
//===----------------------------------------------------------------------===//
template <typename ImutInfo >
class ImutAVLFactory {
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;
CacheTy Cache;
uintptr_t Allocator;
bool ownsAllocator() const {
return Allocator & 0x1 ? false : true;
}
BumpPtrAllocator& getAllocator() const {
return *reinterpret_cast<BumpPtrAllocator*>(Allocator & ~0x1);
}
//===--------------------------------------------------===//
// Public interface.
//===--------------------------------------------------===//
public:
ImutAVLFactory()
: Allocator(reinterpret_cast<uintptr_t>(new BumpPtrAllocator())) {}
ImutAVLFactory(BumpPtrAllocator& Alloc)
: Allocator(reinterpret_cast<uintptr_t>(&Alloc) | 0x1) {}
~ImutAVLFactory() {
if (ownsAllocator()) delete &getAllocator();
}
TreeTy* add(TreeTy* T, value_type_ref V) {
T = add_internal(V,T);
markImmutable(T);
return T;
}
TreeTy* remove(TreeTy* T, key_type_ref V) {
T = remove_internal(V,T);
markImmutable(T);
return T;
}
TreeTy* getEmptyTree() const { return NULL; }
protected:
//===--------------------------------------------------===//
// A bunch of quick helper functions used for reasoning
// about the properties of trees and their children.
// These have succinct names so that the balancing code
// is as terse (and readable) as possible.
//===--------------------------------------------------===//
bool isEmpty(TreeTy* T) const { return !T; }
unsigned getHeight(TreeTy* T) const { return T ? T->getHeight() : 0; }
TreeTy* getLeft(TreeTy* T) const { return T->getLeft(); }
TreeTy* getRight(TreeTy* T) const { return T->getRight(); }
value_type_ref getValue(TreeTy* T) const { return T->value; }
unsigned incrementHeight(TreeTy* L, TreeTy* R) const {
unsigned hl = getHeight(L);
unsigned hr = getHeight(R);
return (hl > hr ? hl : hr) + 1;
}
static bool compareTreeWithSection(TreeTy* T,
typename TreeTy::iterator& TI,
typename TreeTy::iterator& TE) {
typename TreeTy::iterator I = T->begin(), E = T->end();
for ( ; I!=E ; ++I, ++TI) {
if (TI == TE || !I->isElementEqual(*TI))
return false;
}
return true;
}
//===--------------------------------------------------===//
// "createNode" is used to generate new tree roots that link
// to other trees. The functon may also simply move links
// in an existing root if that root is still marked mutable.
// This is necessary because otherwise our balancing code
// would leak memory as it would create nodes that are
// then discarded later before the finished tree is
// returned to the caller.
//===--------------------------------------------------===//
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));
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;
}
else
return createNode(newLeft, getValue(oldTree), newRight);
}
/// balanceTree - Used by add_internal and remove_internal to
/// balance a newly created tree.
TreeTy* balanceTree(TreeTy* L, value_type_ref V, TreeTy* R) {
unsigned hl = getHeight(L);
unsigned hr = getHeight(R);
if (hl > hr + 2) {
assert(!isEmpty(L) && "Left tree cannot be empty to have a height >= 2");
TreeTy *LL = getLeft(L);
TreeTy *LR = getRight(L);
if (getHeight(LL) >= getHeight(LR))
return createNode(LL, L, createNode(LR,V,R));
assert(!isEmpty(LR) && "LR cannot be empty because it has a height >= 1");
TreeTy *LRL = getLeft(LR);
TreeTy *LRR = getRight(LR);
return createNode(createNode(LL,L,LRL), LR, createNode(LRR,V,R));
}
else if (hr > hl + 2) {
assert(!isEmpty(R) && "Right tree cannot be empty to have a height >= 2");
TreeTy *RL = getLeft(R);
TreeTy *RR = getRight(R);
if (getHeight(RR) >= getHeight(RL))
return createNode(createNode(L,V,RL), R, RR);
assert(!isEmpty(RL) && "RL cannot be empty because it has a height >= 1");
TreeTy *RLL = getLeft(RL);
TreeTy *RLR = getRight(RL);
return createNode(createNode(L,V,RLL), RL, createNode(RLR,R,RR));
}
else
return createNode(L,V,R);
}
/// add_internal - Creates a new tree that includes the specified
/// data and the data from the original tree. If the original tree
/// already contained the data item, the original tree is returned.
TreeTy* add_internal(value_type_ref V, TreeTy* T) {
if (isEmpty(T))
return createNode(T, V, T);
assert(!T->isMutable());
key_type_ref K = ImutInfo::KeyOfValue(V);
key_type_ref KCurrent = ImutInfo::KeyOfValue(getValue(T));
if (ImutInfo::isEqual(K,KCurrent))
return createNode(getLeft(T), V, getRight(T));
else if (ImutInfo::isLess(K,KCurrent))
return balanceTree(add_internal(V, getLeft(T)), getValue(T), getRight(T));
else
return balanceTree(getLeft(T), getValue(T), add_internal(V, getRight(T)));
}
/// remove_internal - Creates a new tree that includes all the data
/// from the original tree except the specified data. If the
/// specified data did not exist in the original tree, the original
/// tree is returned.
TreeTy* remove_internal(key_type_ref K, TreeTy* T) {
if (isEmpty(T))
return T;
assert(!T->isMutable());
key_type_ref KCurrent = ImutInfo::KeyOfValue(getValue(T));
if (ImutInfo::isEqual(K,KCurrent)) {
return combineTrees(getLeft(T), getRight(T));
} else if (ImutInfo::isLess(K,KCurrent)) {
return balanceTree(remove_internal(K, getLeft(T)),
getValue(T), getRight(T));
} else {
return balanceTree(getLeft(T), getValue(T),
remove_internal(K, getRight(T)));
}
}
TreeTy* combineTrees(TreeTy* L, TreeTy* R) {
if (isEmpty(L))
return R;
if (isEmpty(R))
return L;
TreeTy* OldNode;
TreeTy* newRight = removeMinBinding(R,OldNode);
return balanceTree(L, getValue(OldNode), newRight);
}
TreeTy* removeMinBinding(TreeTy* T, TreeTy*& Noderemoved) {
assert(!isEmpty(T));
if (isEmpty(getLeft(T))) {
Noderemoved = T;
return getRight(T);
}
return balanceTree(removeMinBinding(getLeft(T), Noderemoved),
getValue(T), getRight(T));
}
/// markImmutable - Clears the mutable bits of a root and all of its
/// descendants.
void markImmutable(TreeTy* T) {
if (!T || !T->isMutable())
return;
T->markImmutable();
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;
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;
}
// 'TNew' is the only tree of its kind. Return it.
Cache.InsertNode(TNew, (void*) &*Cache.bucket_end(hash));
return TNew;
}
};
//===----------------------------------------------------------------------===//
// Immutable AVL-Tree Iterators.
//===----------------------------------------------------------------------===//
template <typename ImutInfo>
class ImutAVLTreeGenericIterator {
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) {
if (Root) stack.push_back(reinterpret_cast<uintptr_t>(Root));
}
TreeTy* operator*() const {
assert(!stack.empty());
return reinterpret_cast<TreeTy*>(stack.back() & ~Flags);
}
uintptr_t getVisitState() {
assert(!stack.empty());
return stack.back() & Flags;
}
bool atEnd() const { return stack.empty(); }
bool atBeginning() const {
return stack.size() == 1 && getVisitState() == VisitedNone;
}
void skipToParent() {
assert(!stack.empty());
stack.pop_back();
if (stack.empty())
return;
switch (getVisitState()) {
case VisitedNone:
stack.back() |= VisitedLeft;
break;
case VisitedLeft:
stack.back() |= VisitedRight;
break;
default:
assert(false && "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;
}
inline bool operator!=(const _Self& x) const { return !operator==(x); }
_Self& operator++() {
assert(!stack.empty());
TreeTy* Current = reinterpret_cast<TreeTy*>(stack.back() & ~Flags);
assert(Current);
switch (getVisitState()) {
case VisitedNone:
if (TreeTy* L = Current->getLeft())
stack.push_back(reinterpret_cast<uintptr_t>(L));
else
stack.back() |= VisitedLeft;
break;
case VisitedLeft:
if (TreeTy* R = Current->getRight())
stack.push_back(reinterpret_cast<uintptr_t>(R));
else
stack.back() |= VisitedRight;
break;
case VisitedRight:
skipToParent();
break;
default:
assert(false && "Unreachable.");
}
return *this;
}
_Self& operator--() {
assert(!stack.empty());
TreeTy* Current = reinterpret_cast<TreeTy*>(stack.back() & ~Flags);
assert(Current);
switch (getVisitState()) {
case VisitedNone:
stack.pop_back();
break;
case VisitedLeft:
stack.back() &= ~Flags; // Set state to "VisitedNone."
if (TreeTy* L = Current->getLeft())
stack.push_back(reinterpret_cast<uintptr_t>(L) | VisitedRight);
break;
case VisitedRight:
stack.back() &= ~Flags;
stack.back() |= VisitedLeft;
if (TreeTy* R = Current->getRight())
stack.push_back(reinterpret_cast<uintptr_t>(R) | VisitedRight);
break;
default:
assert(false && "Unreachable.");
}
return *this;
}
};
template <typename ImutInfo>
class ImutAVLTreeInOrderIterator {
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.
}
ImutAVLTreeInOrderIterator() : InternalItr() {}
inline bool operator==(const _Self& x) const {
return InternalItr == x.InternalItr;
}
inline bool operator!=(const _Self& x) const { return !operator==(x); }
inline TreeTy* operator*() const { return *InternalItr; }
inline TreeTy* operator->() const { return *InternalItr; }
inline _Self& operator++() {
do ++InternalItr;
while (!InternalItr.atEnd() &&
InternalItr.getVisitState() != InternalIteratorTy::VisitedLeft);
return *this;
}
inline _Self& operator--() {
do --InternalItr;
while (!InternalItr.atBeginning() &&
InternalItr.getVisitState() != InternalIteratorTy::VisitedLeft);
return *this;
}
inline void skipSubTree() {
InternalItr.skipToParent();
while (!InternalItr.atEnd() &&
InternalItr.getVisitState() != InternalIteratorTy::VisitedLeft)
++InternalItr;
}
};
//===----------------------------------------------------------------------===//
// Trait classes for Profile information.
//===----------------------------------------------------------------------===//
/// Generic profile template. The default behavior is to invoke the
/// profile method of an object. Specializations for primitive integers
/// and generic handling of pointers is done below.
template <typename T>
struct ImutProfileInfo {
typedef const T value_type;
typedef const T& value_type_ref;
static inline void Profile(FoldingSetNodeID& ID, value_type_ref X) {
FoldingSetTrait<T>::Profile(X,ID);
}
};
/// Profile traits for integers.
template <typename T>
struct ImutProfileInteger {
typedef const T value_type;
typedef const T& value_type_ref;
static inline void Profile(FoldingSetNodeID& ID, value_type_ref X) {
ID.AddInteger(X);
}
};
#define PROFILE_INTEGER_INFO(X)\
template<> struct ImutProfileInfo<X> : ImutProfileInteger<X> {};
PROFILE_INTEGER_INFO(char)
PROFILE_INTEGER_INFO(unsigned char)
PROFILE_INTEGER_INFO(short)
PROFILE_INTEGER_INFO(unsigned short)
PROFILE_INTEGER_INFO(unsigned)
PROFILE_INTEGER_INFO(signed)
PROFILE_INTEGER_INFO(long)
PROFILE_INTEGER_INFO(unsigned long)
PROFILE_INTEGER_INFO(long long)
PROFILE_INTEGER_INFO(unsigned long long)
#undef PROFILE_INTEGER_INFO
/// Generic profile trait for pointer types. We treat pointers as
/// references to unique objects.
template <typename T>
struct ImutProfileInfo<T*> {
typedef const T* value_type;
typedef value_type value_type_ref;
static inline void Profile(FoldingSetNodeID &ID, value_type_ref X) {
ID.AddPointer(X);
}
};
//===----------------------------------------------------------------------===//
// Trait classes that contain element comparison operators and type
// definitions used by ImutAVLTree, ImmutableSet, and ImmutableMap. These
// inherit from the profile traits (ImutProfileInfo) to include operations
// for element profiling.
//===----------------------------------------------------------------------===//
/// ImutContainerInfo - Generic definition of comparison operations for
/// elements of immutable containers that defaults to using
/// std::equal_to<> and std::less<> to perform comparison of elements.
template <typename T>
struct ImutContainerInfo : public ImutProfileInfo<T> {
typedef typename ImutProfileInfo<T>::value_type value_type;
typedef typename ImutProfileInfo<T>::value_type_ref value_type_ref;
typedef value_type key_type;
typedef value_type_ref key_type_ref;
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 inline 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) {
return std::less<key_type>()(LHS,RHS);
}
static inline bool isDataEqual(data_type_ref,data_type_ref) { return true; }
};
/// ImutContainerInfo - Specialization for pointer values to treat pointers
/// as references to unique objects. Pointers are thus compared by
/// their addresses.
template <typename T>
struct ImutContainerInfo<T*> : public ImutProfileInfo<T*> {
typedef typename ImutProfileInfo<T*>::value_type value_type;
typedef typename ImutProfileInfo<T*>::value_type_ref value_type_ref;
typedef value_type key_type;
typedef value_type_ref key_type_ref;
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 inline 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 inline bool isDataEqual(data_type_ref,data_type_ref) { return true; }
};
//===----------------------------------------------------------------------===//
// Immutable Set
//===----------------------------------------------------------------------===//
template <typename ValT, typename ValInfo = ImutContainerInfo<ValT> >
class ImmutableSet {
public:
typedef typename ValInfo::value_type value_type;
typedef typename ValInfo::value_type_ref value_type_ref;
typedef ImutAVLTree<ValInfo> TreeTy;
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) {}
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) {}
/// getEmptySet - Returns an immutable set that contains no elements.
ImmutableSet getEmptySet() {
return ImmutableSet(F.getEmptyTree());
}
/// add - Creates a new immutable set that contains all of the values
/// of the original set with the addition of the specified value. If
/// the original set already included the value, then the original set is
/// returned and no memory is allocated. The time and space complexity
/// of this operation is logarithmic in the size of the original set.
/// The memory allocated to represent the set is released when the
/// factory object that created the set is destroyed.
ImmutableSet add(ImmutableSet Old, value_type_ref V) {
TreeTy *NewT = F.add(Old.Root, V);
return ImmutableSet(Canonicalize ? F.getCanonicalTree(NewT) : NewT);
}
/// remove - Creates a new immutable set that contains all of the values
/// of the original set with the exception of the specified value. If
/// the original set did not contain the value, the original set is
/// returned and no memory is allocated. The time and space complexity
/// of this operation is logarithmic in the size of the original set.
/// The memory allocated to represent the set is released when the
/// factory object that created the set is destroyed.
ImmutableSet remove(ImmutableSet Old, value_type_ref V) {
TreeTy *NewT = F.remove(Old.Root, V);
return ImmutableSet(Canonicalize ? F.getCanonicalTree(NewT) : NewT);
}
BumpPtrAllocator& getAllocator() { return F.getAllocator(); }
private:
Factory(const Factory& RHS); // DO NOT IMPLEMENT
void operator=(const Factory& RHS); // DO NOT IMPLEMENT
};
friend class Factory;
/// contains - 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 {
return Root && RHS.Root ? Root->isEqual(*RHS.Root) : Root == RHS.Root;
}
bool operator!=(ImmutableSet RHS) const {
return Root && RHS.Root ? Root->isNotEqual(*RHS.Root) : Root != RHS.Root;
}
TreeTy *getRoot() {
return 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; }
template <typename Callback>
void foreach(Callback& C) { if (Root) Root->foreach(C); }
template <typename Callback>
void foreach() { if (Root) { Callback C; Root->foreach(C); } }
//===--------------------------------------------------===//
// 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*()); }
};
iterator begin() const { return iterator(Root); }
iterator end() const { return iterator(); }
//===--------------------------------------------------===//
// Utility methods.
//===--------------------------------------------------===//
unsigned getHeight() const { return Root ? Root->getHeight() : 0; }
static inline void Profile(FoldingSetNodeID& ID, const ImmutableSet& S) {
ID.AddPointer(S.Root);
}
inline void Profile(FoldingSetNodeID& ID) const {
return Profile(ID,*this);
}
//===--------------------------------------------------===//
// For testing.
//===--------------------------------------------------===//
void validateTree() const { if (Root) Root->validateTree(); }
};
} // end namespace llvm
#endif
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