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Remove SmallMap, and the several files that were used to implement it.

Browse Source 
We have SmallDenseMap now that has more correct and predictable
semantics, even though it is a more narrow abstraction.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158644 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth 2012-06-17 12:07:42 +00:00
parent 5f6c7cfa93
commit b4bec53f36
3 changed files with 0 additions and 912 deletions
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325
include/llvm/ADT/FlatArrayMap.h
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//===- llvm/ADT/FlatArrayMap.h - 'Normally small' pointer set ----*- 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 FlatArrayMap class.
// See FlatArrayMap doxygen comments for more details.
//
//===----------------------------------------------------------------------===//
#ifndef FLATARRAYMAP_H_
#define FLATARRAYMAP_H_
#include <algorithm>
#include <utility>
#include "llvm/Support/type_traits.h"
namespace llvm {
template <typename KeyTy, typename MappedTy>
struct FlatArrayMapTypes {
typedef KeyTy key_type;
typedef MappedTy mapped_type;
typedef typename std::pair<key_type, mapped_type> value_type;
};
template<typename KeyTy, typename MappedTy, bool IsConst = false>
class FlatArrayMapIterator;
//===--------------------------------------------------------------------===//
/// FlatArrayMap presents map container interface.
/// It uses flat array implementation inside:
/// [ <key0, value0>, <key1, value1>, ... <keyN, valueN> ]
/// It works fast for small amount of elements.
/// User should pass key type, mapped type (type of value), and maximum
/// number of elements.
/// After maximum number of elements is reached, map declines any farther
/// attempts to insert new elements ("insert" method returns <end(),false>).
///
template <typename KeyTy, typename MappedTy, unsigned MaxArraySize>
class FlatArrayMap {
public:
typedef FlatArrayMapTypes<KeyTy, MappedTy> Types;
typedef typename Types::key_type key_type;
typedef typename Types::mapped_type mapped_type;
typedef typename Types::value_type value_type;
typedef FlatArrayMapIterator<KeyTy, MappedTy> iterator;
typedef FlatArrayMapIterator<KeyTy, MappedTy, true> const_iterator;
typedef FlatArrayMap<KeyTy, MappedTy, MaxArraySize> self;
private:
enum { BadIndex = -1U };
key_type EmptyKey;
mapped_type EmptyValue;
value_type Array[MaxArraySize + 1];
unsigned NumElements;
unsigned findFor(const KeyTy Ptr) const {
// Linear search for the item.
for (const value_type *APtr = Array, *E = Array + NumElements;
APtr != E; ++APtr) {
if (APtr->first == Ptr) {
return APtr - Array;
}
}
return BadIndex;
}
bool lookupFor(const KeyTy &Ptr, const value_type*& Found) const {
unsigned FoundIdx = findFor(Ptr);
if (FoundIdx != BadIndex) {
Found = Array + FoundIdx;
return true;
}
return false;
}
bool lookupFor(const KeyTy &Ptr, value_type*& Found) {
unsigned FoundIdx = findFor(Ptr);
if (FoundIdx != BadIndex) {
Found = Array + FoundIdx;
return true;
}
return false;
}
void copyFrom(const self &RHS) {
std::copy(RHS.Array, RHS.Array + MaxArraySize + 1, Array);
NumElements = RHS.NumElements;
}
void init () {
// Even if Array contains non POD, use memset for last element,
// since it is used as end() iterator only.
memset(Array + MaxArraySize, 0, sizeof(value_type));
NumElements = 0;
}
bool insertInternal(KeyTy Ptr, MappedTy Val, value_type*& Item) {
// Check to see if it is already in the set.
value_type *Found;
if (lookupFor(Ptr, Found)) {
Item = Found;
return false;
}
if (NumElements < MaxArraySize) {
unsigned Idx = NumElements++;
Array[Idx] = std::make_pair(Ptr, Val);
Item = Array + Idx;
return true;
}
Item = Array + MaxArraySize; // return end()
return false;
}
public:
// Constructors
FlatArrayMap() : EmptyKey(), EmptyValue() {
init();
}
FlatArrayMap(const self &that) :
EmptyKey(), EmptyValue() {
copyFrom(that);
}
template<typename It>
FlatArrayMap(It I, It E) :
EmptyKey(), EmptyValue() {
init();
insert(I, E);
}
// Size
unsigned size() const {
return NumElements;
}
bool empty() const {
return !NumElements;
}
// Iterators
iterator begin() {
return iterator(Array);
}
const_iterator begin() const {
return const_iterator(Array);
}
iterator end() {
return iterator(Array + NumElements);
}
const_iterator end() const {
return const_iterator(Array + NumElements);
}
// Modifiers
void clear() {
for (unsigned i = 0; i < NumElements; ++i) {
Array[i].first = EmptyKey;
Array[i].second = EmptyValue;
}
NumElements = 0;
}
// The map container is extended by inserting a single new element.
// The behavior is the same as the std::map::insert, except the
// case when maximum number of elements is reached;
// in this case map declines any farther attempts
// to insert new elements ("insert" method returns <end(),false>).
std::pair<iterator, bool> insert(const value_type& KV) {
value_type* Item;
bool Res = insertInternal(KV.first, KV.second, Item);
return std::make_pair(iterator(Item), Res);
}
template <typename IterT>
void insert(IterT I, IterT E) {
for (; I != E; ++I)
insert(*I);
}
void erase(key_type K) {
unsigned Found = findFor(K);
if (Found != BadIndex) {
value_type *APtr = Array + Found;
value_type *E = Array + NumElements;
*APtr = E[-1];
E[-1].first.~key_type();
E[-1].second.~mapped_type();
--NumElements;
}
}
void erase(iterator i) {
erase(i->first);
}
void swap(self& RHS) {
std::swap_ranges(Array, Array+MaxArraySize, RHS.Array);
std::swap(this->NumElements, RHS.NumElements);
}
// Search operations
iterator find(const key_type& K) {
value_type *Found;
if (lookupFor(K, Found))
return iterator(Found);
return end();
}
const_iterator find(const key_type& K) const {
const value_type *Found;
if (lookupFor(K, Found))
return const_iterator(Found);
return end();
}
bool count(const key_type& K) const {
return find(K) != end();
}
mapped_type &operator[](const key_type &Key) {
std::pair<iterator, bool> res = insert(Key, mapped_type());
return res.first->second;
}
// Other operations
self& operator=(const self& other) {
clear();
copyFrom(other);
return *this;
}
/// isPointerIntoBucketsArray - Return true if the specified pointer points
/// somewhere into the map's array of buckets (i.e. either to a key or
/// value).
bool isPointerIntoBucketsArray(const void *Ptr) const {
return Ptr >= Array && Ptr < Array + NumElements;
}
/// getPointerIntoBucketsArray() - Return an opaque pointer into the buckets
/// array.
const void *getPointerIntoBucketsArray() const { return Array; }
};
template<typename KeyTy, typename MappedTy, bool IsConst>
class FlatArrayMapIterator {
typedef FlatArrayMapTypes<KeyTy, MappedTy> Types;
typedef typename conditional<IsConst,
const typename Types::value_type,
typename Types::value_type>::type value_type;
typedef value_type *pointer;
typedef value_type &reference;
typedef FlatArrayMapIterator<KeyTy, MappedTy, IsConst> self;
typedef FlatArrayMapIterator<KeyTy, MappedTy, false> non_const_self;
typedef FlatArrayMapIterator<KeyTy, MappedTy, true> const_self;
friend class FlatArrayMapIterator<KeyTy, MappedTy, false>;
friend class FlatArrayMapIterator<KeyTy, MappedTy, true>;
pointer TheBucket;
public:
FlatArrayMapIterator() : TheBucket(0) {}
explicit FlatArrayMapIterator(pointer BP) :
TheBucket(BP) {}
// If IsConst is true this is a converting constructor from iterator to
// const_iterator and the default copy constructor is used.
// Otherwise this is a copy constructor for iterator.
FlatArrayMapIterator(const non_const_self& I)
: TheBucket(I.TheBucket) {}
bool operator==(const const_self &RHS) const {
return TheBucket->first == RHS.TheBucket->first;
}
bool operator!=(const const_self &RHS) const {
return TheBucket->first != RHS.TheBucket->first;
}
reference operator*() const {
return *TheBucket;
}
pointer operator->() const {
return TheBucket;
}
inline self& operator++() { // Preincrement
++TheBucket;
return *this;
}
self operator++(int) { // Postincrement
FlatArrayMapIterator tmp = *this; ++*this; return tmp;
}
};
}
#endif /* FLATARRAYMAP_H_ */

550
include/llvm/ADT/MultiImplMap.h
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//===- llvm/ADT/MultiImplMap.h - 'Normally small' pointer set ----*- 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 MultiImplMap class.
// MultiImplMap presents map container interface.
// It has two modes, one for small amount of elements and one for big amount.
// User should set map implementation for both of them. User also should
// set the maximum possible number of elements for small mode.
// If user want to use MultiImplMap instead of DenseMap, he should pass
// DenseMapCompatible = true. Note that in this case map implementations should
// present additional DenseMap specific methods (see below).
// Initially MultiImplMap uses small mode and small map implementation.
// It triggered to the big mode when number of contained elements exceeds
// maximum possible elements for small mode.
//
// Types that should be defined in nested map class:
//
// key_type;
// mapped_type;
// value_type; // std::pair<key_type, mapped_type>
// // or std::pair<const key_type, mapped_type>
// iterator;
// const_iterator;
//
// Map implementation should provide the next interface:
//
// // Constructors
// (default constructor)
// (copy constructor)
//
// // Size
// unsigned size() const;
// bool empty() const;
//
// // Iterators
// iterator begin();
// const_iterator begin();
// iterator end();
// const_iterator end();
//
// // Modifiers
// void clear();
// std::pair<iterator, bool> insert(const value_type& KV);
// template <typename IterT>
// void insert(IterT I, IterT E);
// void erase(key_type K);
// void erase(iterator i);
// void swap(MultiImplMap& rhs);
//
// // Search operations
// iterator find(const key_type& K);
// const_iterator find(const key_type& K) const;
// bool count(const key_type& K) const;
// mapped_type &operator[](const key_type &Key);
//
// // Other operations
// self& operator=(const self& other);
//
// // If DenseMapCompatible == true, you also should present next methods.
// // See DenseMap comments for more details about its behavior.
// bool isPointerIntoBucketsArray(const void *Ptr) const;
// const void *getPointerIntoBucketsArray() const;
// value_type& FindAndConstruct(const key_type &Key);
//
// The list of methods that should be implemented in nested map iterator class:
//
// (conversion constructor from non-constant iterator)
//
// bool operator==(const const_iterator& rhs) const;
// bool operator!=(const const_iterator& rhs) const;
// reference operator*() const;
// pointer operator->() const;
// inline self& operator++();
//
//
//===----------------------------------------------------------------------===//
#ifndef MULTIIMPLEMENTATIONMAP_H_
#define MULTIIMPLEMENTATIONMAP_H_
#include <algorithm>
#include <utility>
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/FlatArrayMap.h"
#include "llvm/Support/type_traits.h"
namespace llvm {
template<class SmallMapTy, class BigMapTy, bool IsConst = false>
class MultiImplMapIterator;
template<class SmallMapTy, class BigMapTy>
struct MultiImplMapIteratorsFactory;
template<class SmallMapTy, class BigMapTy>
struct MultiImplMapTypes {
typedef typename SmallMapTy::key_type key_type;
typedef typename SmallMapTy::mapped_type mapped_type;
typedef typename std::pair<key_type, mapped_type> value_type;
};
//===--------------------------------------------------------------------===//
/// MultiImplMap is map that has two modes, one for small amount of
/// elements and one for big amount.
/// User should set map implementation for both of them. User also should
/// set the maximum possible number of elements for small mode.
/// If user want to use MultiImplMap instead of DenseMap, he should pass
/// DenseMapCompatible = true.
/// Initially MultiImplMap uses small mode and small map implementation.
/// It triggered to the big mode when number of contained elements exceeds
/// maximum possible elements for small mode.
template<class SmallMapTy, class BigMapTy, unsigned MaxSmallN,
bool DenseMapCompatible = false,
class ItFactory =
MultiImplMapIteratorsFactory<SmallMapTy, BigMapTy> >
class MultiImplMap {
protected:
SmallMapTy SmallMap;
BigMapTy BigMap;
bool UseSmall;
enum { MaxSmallSize = MaxSmallN };
public:
typedef MultiImplMapTypes<SmallMapTy, BigMapTy> Types;
typedef typename Types::key_type key_type;
typedef typename Types::mapped_type mapped_type;
typedef typename Types::value_type value_type;
typedef typename ItFactory::iterator iterator;
typedef typename ItFactory::const_iterator const_iterator;
typedef std::pair<iterator, bool> ins_res;
typedef typename std::pair<typename SmallMapTy::iterator, bool>
small_ins_res;
typedef typename std::pair<typename BigMapTy::iterator, bool>
big_ins_res;
typedef MultiImplMap<SmallMapTy, BigMapTy, MaxSmallN> self;
MultiImplMap() : UseSmall(true) {}
MultiImplMap(const self& other) {
if (other.UseSmall) {
SmallMap = other.SmallMap;
UseSmall = true;
} else {
if (other.size() <= MaxSmallN) {
SmallMap.insert(other.BigMap.begin(), other.BigMap.end());
UseSmall = true;
} else {
BigMap = other.BigMap;
UseSmall = false;
}
}
}
// Size
unsigned size() const {
if (UseSmall)
return SmallMap.size();
return BigMap.size();
}
bool empty() const {
if (UseSmall)
return SmallMap.empty();
return BigMap.empty();
}
// Iterators
iterator begin() {
if (UseSmall)
return ItFactory::begin(SmallMap);
return ItFactory::begin(BigMap);
}
const_iterator begin() const {
if (UseSmall)
return ItFactory::begin(SmallMap);
return ItFactory::begin(BigMap);
}
iterator end() {
if (UseSmall)
return ItFactory::end(SmallMap);
return ItFactory::end(BigMap);
}
const_iterator end() const {
if (UseSmall)
return ItFactory::end(SmallMap);
return ItFactory::end(BigMap);
}
// Modifiers
void clear() {
if (UseSmall)
SmallMap.clear();
else
BigMap.clear();
}
std::pair<iterator, bool> insert(const value_type& KV) {
if (UseSmall) {
if (SmallMap.size() < MaxSmallSize) {
small_ins_res Res = SmallMap.insert(KV);
return std::make_pair(ItFactory::it(SmallMap, Res.first), Res.second);
}
// Move all to big map.
BigMap.insert(SmallMap.begin(), SmallMap.end());
SmallMap.clear();
UseSmall = false;
}
big_ins_res Res = BigMap.insert(KV);
return std::make_pair(ItFactory::it(BigMap, Res.first), Res.second);
}
template <typename OtherValTy>
std::pair<iterator, bool> insert(const OtherValTy& OtherKV) {
const value_type* KV = reinterpret_cast<const value_type*>(
reinterpret_cast<const void*>(OtherKV));
return insert(*KV);
}
template <typename IterT>
void insert(IterT I, IterT E) {
for (; I != E; ++I)
insert(*I);
}
void erase(key_type K) {
if (UseSmall)
SmallMap.erase(K);
else
BigMap.erase(K);
}
void erase(iterator i) {
erase(i->first);
}
void swap(MultiImplMap& rhs) {
SmallMap.swap(rhs.SmallMap);
BigMap.swap(rhs.BigMap);
std::swap(UseSmall, rhs.UseSmall);
}
// Search operations
iterator find(const key_type& K) {
if (UseSmall)
return ItFactory::it(SmallMap, SmallMap.find(K));
return ItFactory::it(BigMap, BigMap.find(K));
}
const_iterator find(const key_type& K) const {
if (UseSmall)
return ItFactory::const_it(SmallMap, SmallMap.find(K));
return ItFactory::const_it(BigMap, BigMap.find(K));
}
bool count(const key_type& K) const {
return find(K) != end();
}
mapped_type &operator[](const key_type &Key) {
ins_res res = insert(std::make_pair(Key, mapped_type()));
return res.first->second;
}
// Other operations
self& operator=(const self& other) {
if (other.isSmall()) {
SmallMap = other.SmallMap;
if (!UseSmall) {
BigMap.clear();
UseSmall = true;
}
return *this;
}
if (UseSmall) {
SmallMap.clear();
UseSmall = false;
}
BigMap = other.BigMap;
return *this;
}
// Utilities
bool isSmall()const {
return UseSmall;
}
SmallMapTy& getSmallMap() {
return SmallMap;
}
const SmallMapTy& getSmallMap() const {
return SmallMap;
}
BigMapTy& getBigMap() {
return BigMap;
}
const BigMapTy& getBigMap() const {
return BigMap;
}
};
template<class SmallMapTy, class BigMapTy, unsigned MaxSmallN>
class MultiImplMap<SmallMapTy, BigMapTy, MaxSmallN, true> :
public MultiImplMap<SmallMapTy, BigMapTy, MaxSmallN, false>
{
public:
typedef MultiImplMap<SmallMapTy, BigMapTy, MaxSmallN, false> ParentTy;
typedef typename ParentTy::Types Types;
typedef typename Types::key_type key_type;
typedef typename Types::mapped_type mapped_type;
typedef typename Types::value_type value_type;
typedef typename ParentTy::iterator iterator;
/// isPointerIntoBucketsArray - Return true if the specified pointer points
/// somewhere into the DenseMap's array of buckets (i.e. either to a key or
/// value).
bool isPointerIntoBucketsArray(const void *Ptr) const {
if (this->UseSmall)
return this->SmallMap.isPointerIntoBucketsArray(Ptr);
return this->BigMap.isPointerIntoBucketsArray(Ptr);
}
/// getPointerIntoBucketsArray() - Return an opaque pointer into the buckets
/// array. In conjunction with the previous method, this can be used to
/// determine whether an insertion caused the map to reallocate data.
const void *getPointerIntoBucketsArray() const {
if (this->UseSmall)
return this->SmallMap.getPointerIntoBucketsArray();
return this->BigMap.getPointerIntoBucketsArray();
}
value_type& FindAndConstruct(const key_type &Key) {
std::pair<iterator, bool> Res =
this->insert(std::make_pair(Key, mapped_type()));
return *Res.first;
}
};
template<class SmallMapTy, class BigMapTy, bool IsConst>
class MultiImplMapIterator {
public:
typedef MultiImplMapTypes<SmallMapTy, BigMapTy> Types;
typedef typename Types::mapped_type mapped_type;
typedef typename conditional<IsConst,
const typename Types::value_type,
typename Types::value_type>::type value_type;
typedef typename conditional<IsConst,
typename SmallMapTy::const_iterator,
typename SmallMapTy::iterator>::type
small_iterator;
typedef typename conditional<IsConst,
typename BigMapTy::const_iterator,
typename BigMapTy::iterator>::type
big_iterator;
typedef typename conditional<IsConst, const void*, void*>::type void_ptr_ty;
typedef value_type *pointer;
typedef value_type &reference;
typedef MultiImplMapIterator<SmallMapTy, BigMapTy, IsConst> self;
typedef MultiImplMapIterator<SmallMapTy, BigMapTy, false> non_const_self;
typedef MultiImplMapIterator<SmallMapTy, BigMapTy, true> const_self;
friend class MultiImplMapIterator<SmallMapTy, BigMapTy, true>;
friend class MultiImplMapIterator<SmallMapTy, BigMapTy, false>;
protected:
template <typename OtherValTy>
static value_type* toValueTypePtr(OtherValTy& ValTyRef) {
return reinterpret_cast<value_type*>(
reinterpret_cast<void_ptr_ty>(&ValTyRef));
}
template <typename OtherValTy>
static value_type& toValueTypeRef(OtherValTy& ValTyRef) {
return *reinterpret_cast<value_type*>(
reinterpret_cast<void_ptr_ty>(&ValTyRef));
}
small_iterator SmallIt;
big_iterator BigIt;
bool UseSmall;
public:
MultiImplMapIterator() : UseSmall(true) {}
MultiImplMapIterator(small_iterator It) : SmallIt(It), UseSmall(true) {}
MultiImplMapIterator(big_iterator It) : BigIt(It), UseSmall(false) {}
MultiImplMapIterator(const non_const_self& src) :
SmallIt(src.SmallIt), BigIt(src.BigIt), UseSmall(src.UseSmall) {}
bool operator==(const const_self& rhs) const {
if (UseSmall != rhs.UseSmall)
return false;
if (UseSmall)
return SmallIt == rhs.SmallIt;
return BigIt == rhs.BigIt;
}
bool operator!=(const const_self& rhs) const {
if (UseSmall != rhs.UseSmall)
return true;
if (UseSmall)
return SmallIt != rhs.SmallIt;
return BigIt != rhs.BigIt;
}
reference operator*() const {
return UseSmall ? toValueTypeRef(*SmallIt) : toValueTypeRef(*BigIt);;
}
pointer operator->() const {
return UseSmall ? toValueTypePtr(*SmallIt) : toValueTypePtr(*BigIt);
}
// Preincrement
inline self& operator++() {
if (UseSmall) ++SmallIt;
return *this;
}
// Postincrement
self operator++(int) {
self tmp = *this; ++*this; return tmp;
}
};
template<class SmallMapTy, class BigMapTy>
struct MultiImplMapIteratorsFactory {
typedef MultiImplMapIterator<SmallMapTy, BigMapTy, false> iterator;
typedef MultiImplMapIterator<SmallMapTy, BigMapTy, true> const_iterator;
template<class MapImpl, class ItTy>
static iterator it(MapImpl& impl, ItTy it) {
return iterator(it);
}
template<class MapImpl, class ConstItTy>
static const_iterator const_it(const MapImpl& impl, ConstItTy it) {
return const_iterator(it);
}
template<class MapImpl>
static iterator begin(MapImpl& impl) {
return iterator(impl.begin());
}
template<class MapImpl>
static const_iterator begin(const MapImpl& impl) {
return const_iterator(impl.begin());
}
template<class MapImpl>
static iterator end(MapImpl& impl) {
return iterator(impl.end());
}
template<class MapImpl>
static const_iterator end(const MapImpl& impl) {
return const_iterator(impl.end());
}
};
template<typename KeyTy, typename MappedTy, unsigned MaxArraySize,
typename KeyInfoT>
struct MultiImplMapIteratorsFactory<
FlatArrayMap<KeyTy, MappedTy, MaxArraySize>,
DenseMap<KeyTy, MappedTy, KeyInfoT> >
{
typedef FlatArrayMap<KeyTy, MappedTy, MaxArraySize> SmallMapTy;
typedef DenseMap<KeyTy, MappedTy, KeyInfoT> BigMapTy;
typedef DenseMapIterator<KeyTy, MappedTy, KeyInfoT, false>
iterator;
typedef DenseMapIterator<KeyTy, MappedTy, KeyInfoT, true>
const_iterator;
static iterator it(SmallMapTy& impl, typename SmallMapTy::iterator it) {
return iterator(&(*it), &(*impl.end()));
}
static const_iterator const_it(
const SmallMapTy& impl, typename SmallMapTy::const_iterator it) {
return const_iterator(&(*it), &(*impl.end()));
}
static iterator it(BigMapTy& impl, typename BigMapTy::iterator it) {
return it;
}
static const_iterator const_it(
const BigMapTy& impl, typename BigMapTy::const_iterator it) {
return it;
}
static iterator begin(SmallMapTy& impl) {
return it(impl, impl.begin());
}
static const_iterator begin(const SmallMapTy& impl) {
return it(impl, impl.begin());
}
static iterator begin(BigMapTy& impl) {
return impl.begin();
}
static const_iterator begin(const BigMapTy& impl) {
return impl.begin();
}
static iterator end(SmallMapTy& impl) {
return it(impl, impl.end());
}
static const_iterator end(const SmallMapTy& impl) {
return const_it(impl, impl.end());
}
static iterator end(BigMapTy& impl) {
return impl.end();
}
static const_iterator end(const BigMapTy& impl) {
return impl.end();
}
};
}
#endif /* MULTIIMPLEMENTATIONMAP_H_ */

37
include/llvm/ADT/SmallMap.h
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//===- llvm/ADT/SmallMap.h - 'Normally small' pointer set -------*- 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 SmallMap class.
// SmallMap is DenseMap compatible MultiImplMap.
// It uses FlatArrayMap for small mode, and DenseMap for big mode.
// See MultiMapImpl comments for more details on the algorithm is used.
//
//===----------------------------------------------------------------------===//
#ifndef SMALLPTRMAP_H_
#define SMALLPTRMAP_H_
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/FlatArrayMap.h"
#include "llvm/ADT/MultiImplMap.h"
namespace llvm {
//===--------------------------------------------------------------------===//
/// SmallMap is wrapper around MultiImplMap. It uses FlatArrayMap for
/// small mode, and DenseMap for big mode.
template <typename KeyTy, typename MappedTy, unsigned N = 16>
class SmallMap : public MultiImplMap<
FlatArrayMap<KeyTy, MappedTy, N>,
DenseMap<KeyTy, MappedTy>,
N, true> {
};
}
#endif /* SMALLPTRMAP_H_ */