mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-11-08 19:06:39 +00:00
afcbfb40fb
It relies on undefined behaviour, since `StringMapEntry<>` is not a standard layout type. There are no users anyway. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223439 91177308-0d34-0410-b5e6-96231b3b80d8
453 lines
15 KiB
C++
453 lines
15 KiB
C++
//===--- StringMap.h - String Hash table 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 StringMap class.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_ADT_STRINGMAP_H
|
|
#define LLVM_ADT_STRINGMAP_H
|
|
|
|
#include "llvm/ADT/StringRef.h"
|
|
#include "llvm/Support/Allocator.h"
|
|
#include <cstring>
|
|
#include <utility>
|
|
|
|
namespace llvm {
|
|
template<typename ValueT>
|
|
class StringMapConstIterator;
|
|
template<typename ValueT>
|
|
class StringMapIterator;
|
|
template<typename ValueTy>
|
|
class StringMapEntry;
|
|
|
|
/// StringMapEntryBase - Shared base class of StringMapEntry instances.
|
|
class StringMapEntryBase {
|
|
unsigned StrLen;
|
|
public:
|
|
explicit StringMapEntryBase(unsigned Len) : StrLen(Len) {}
|
|
|
|
unsigned getKeyLength() const { return StrLen; }
|
|
};
|
|
|
|
/// StringMapImpl - This is the base class of StringMap that is shared among
|
|
/// all of its instantiations.
|
|
class StringMapImpl {
|
|
protected:
|
|
// Array of NumBuckets pointers to entries, null pointers are holes.
|
|
// TheTable[NumBuckets] contains a sentinel value for easy iteration. Followed
|
|
// by an array of the actual hash values as unsigned integers.
|
|
StringMapEntryBase **TheTable;
|
|
unsigned NumBuckets;
|
|
unsigned NumItems;
|
|
unsigned NumTombstones;
|
|
unsigned ItemSize;
|
|
protected:
|
|
explicit StringMapImpl(unsigned itemSize)
|
|
: TheTable(nullptr),
|
|
// Initialize the map with zero buckets to allocation.
|
|
NumBuckets(0), NumItems(0), NumTombstones(0), ItemSize(itemSize) {}
|
|
StringMapImpl(StringMapImpl &&RHS)
|
|
: TheTable(RHS.TheTable), NumBuckets(RHS.NumBuckets),
|
|
NumItems(RHS.NumItems), NumTombstones(RHS.NumTombstones),
|
|
ItemSize(RHS.ItemSize) {
|
|
RHS.TheTable = nullptr;
|
|
RHS.NumBuckets = 0;
|
|
RHS.NumItems = 0;
|
|
RHS.NumTombstones = 0;
|
|
}
|
|
|
|
StringMapImpl(unsigned InitSize, unsigned ItemSize);
|
|
unsigned RehashTable(unsigned BucketNo = 0);
|
|
|
|
/// LookupBucketFor - Look up the bucket that the specified string should end
|
|
/// up in. If it already exists as a key in the map, the Item pointer for the
|
|
/// specified bucket will be non-null. Otherwise, it will be null. In either
|
|
/// case, the FullHashValue field of the bucket will be set to the hash value
|
|
/// of the string.
|
|
unsigned LookupBucketFor(StringRef Key);
|
|
|
|
/// FindKey - Look up the bucket that contains the specified key. If it exists
|
|
/// in the map, return the bucket number of the key. Otherwise return -1.
|
|
/// This does not modify the map.
|
|
int FindKey(StringRef Key) const;
|
|
|
|
/// RemoveKey - Remove the specified StringMapEntry from the table, but do not
|
|
/// delete it. This aborts if the value isn't in the table.
|
|
void RemoveKey(StringMapEntryBase *V);
|
|
|
|
/// RemoveKey - Remove the StringMapEntry for the specified key from the
|
|
/// table, returning it. If the key is not in the table, this returns null.
|
|
StringMapEntryBase *RemoveKey(StringRef Key);
|
|
private:
|
|
void init(unsigned Size);
|
|
public:
|
|
static StringMapEntryBase *getTombstoneVal() {
|
|
return (StringMapEntryBase*)-1;
|
|
}
|
|
|
|
unsigned getNumBuckets() const { return NumBuckets; }
|
|
unsigned getNumItems() const { return NumItems; }
|
|
|
|
bool empty() const { return NumItems == 0; }
|
|
unsigned size() const { return NumItems; }
|
|
|
|
void swap(StringMapImpl &Other) {
|
|
std::swap(TheTable, Other.TheTable);
|
|
std::swap(NumBuckets, Other.NumBuckets);
|
|
std::swap(NumItems, Other.NumItems);
|
|
std::swap(NumTombstones, Other.NumTombstones);
|
|
}
|
|
};
|
|
|
|
/// StringMapEntry - This is used to represent one value that is inserted into
|
|
/// a StringMap. It contains the Value itself and the key: the string length
|
|
/// and data.
|
|
template<typename ValueTy>
|
|
class StringMapEntry : public StringMapEntryBase {
|
|
StringMapEntry(StringMapEntry &E) LLVM_DELETED_FUNCTION;
|
|
public:
|
|
ValueTy second;
|
|
|
|
explicit StringMapEntry(unsigned strLen)
|
|
: StringMapEntryBase(strLen), second() {}
|
|
template <class InitTy>
|
|
StringMapEntry(unsigned strLen, InitTy &&V)
|
|
: StringMapEntryBase(strLen), second(std::forward<InitTy>(V)) {}
|
|
|
|
StringRef getKey() const {
|
|
return StringRef(getKeyData(), getKeyLength());
|
|
}
|
|
|
|
const ValueTy &getValue() const { return second; }
|
|
ValueTy &getValue() { return second; }
|
|
|
|
void setValue(const ValueTy &V) { second = V; }
|
|
|
|
/// getKeyData - Return the start of the string data that is the key for this
|
|
/// value. The string data is always stored immediately after the
|
|
/// StringMapEntry object.
|
|
const char *getKeyData() const {return reinterpret_cast<const char*>(this+1);}
|
|
|
|
StringRef first() const { return StringRef(getKeyData(), getKeyLength()); }
|
|
|
|
/// Create - Create a StringMapEntry for the specified key and default
|
|
/// construct the value.
|
|
template <typename AllocatorTy, typename InitType>
|
|
static StringMapEntry *Create(StringRef Key, AllocatorTy &Allocator,
|
|
InitType &&InitVal) {
|
|
unsigned KeyLength = Key.size();
|
|
|
|
// Allocate a new item with space for the string at the end and a null
|
|
// terminator.
|
|
unsigned AllocSize = static_cast<unsigned>(sizeof(StringMapEntry))+
|
|
KeyLength+1;
|
|
unsigned Alignment = alignOf<StringMapEntry>();
|
|
|
|
StringMapEntry *NewItem =
|
|
static_cast<StringMapEntry*>(Allocator.Allocate(AllocSize,Alignment));
|
|
|
|
// Default construct the value.
|
|
new (NewItem) StringMapEntry(KeyLength, std::forward<InitType>(InitVal));
|
|
|
|
// Copy the string information.
|
|
char *StrBuffer = const_cast<char*>(NewItem->getKeyData());
|
|
memcpy(StrBuffer, Key.data(), KeyLength);
|
|
StrBuffer[KeyLength] = 0; // Null terminate for convenience of clients.
|
|
return NewItem;
|
|
}
|
|
|
|
template<typename AllocatorTy>
|
|
static StringMapEntry *Create(StringRef Key, AllocatorTy &Allocator) {
|
|
return Create(Key, Allocator, ValueTy());
|
|
}
|
|
|
|
/// Create - Create a StringMapEntry with normal malloc/free.
|
|
template<typename InitType>
|
|
static StringMapEntry *Create(StringRef Key, InitType &&InitVal) {
|
|
MallocAllocator A;
|
|
return Create(Key, A, std::forward<InitType>(InitVal));
|
|
}
|
|
|
|
static StringMapEntry *Create(StringRef Key) {
|
|
return Create(Key, ValueTy());
|
|
}
|
|
|
|
/// GetStringMapEntryFromKeyData - Given key data that is known to be embedded
|
|
/// into a StringMapEntry, return the StringMapEntry itself.
|
|
static StringMapEntry &GetStringMapEntryFromKeyData(const char *KeyData) {
|
|
char *Ptr = const_cast<char*>(KeyData) - sizeof(StringMapEntry<ValueTy>);
|
|
return *reinterpret_cast<StringMapEntry*>(Ptr);
|
|
}
|
|
|
|
/// Destroy - Destroy this StringMapEntry, releasing memory back to the
|
|
/// specified allocator.
|
|
template<typename AllocatorTy>
|
|
void Destroy(AllocatorTy &Allocator) {
|
|
// Free memory referenced by the item.
|
|
unsigned AllocSize =
|
|
static_cast<unsigned>(sizeof(StringMapEntry)) + getKeyLength() + 1;
|
|
this->~StringMapEntry();
|
|
Allocator.Deallocate(static_cast<void *>(this), AllocSize);
|
|
}
|
|
|
|
/// Destroy this object, releasing memory back to the malloc allocator.
|
|
void Destroy() {
|
|
MallocAllocator A;
|
|
Destroy(A);
|
|
}
|
|
};
|
|
|
|
|
|
/// StringMap - This is an unconventional map that is specialized for handling
|
|
/// keys that are "strings", which are basically ranges of bytes. This does some
|
|
/// funky memory allocation and hashing things to make it extremely efficient,
|
|
/// storing the string data *after* the value in the map.
|
|
template<typename ValueTy, typename AllocatorTy = MallocAllocator>
|
|
class StringMap : public StringMapImpl {
|
|
AllocatorTy Allocator;
|
|
public:
|
|
typedef StringMapEntry<ValueTy> MapEntryTy;
|
|
|
|
StringMap() : StringMapImpl(static_cast<unsigned>(sizeof(MapEntryTy))) {}
|
|
explicit StringMap(unsigned InitialSize)
|
|
: StringMapImpl(InitialSize, static_cast<unsigned>(sizeof(MapEntryTy))) {}
|
|
|
|
explicit StringMap(AllocatorTy A)
|
|
: StringMapImpl(static_cast<unsigned>(sizeof(MapEntryTy))), Allocator(A) {}
|
|
|
|
StringMap(unsigned InitialSize, AllocatorTy A)
|
|
: StringMapImpl(InitialSize, static_cast<unsigned>(sizeof(MapEntryTy))),
|
|
Allocator(A) {}
|
|
|
|
StringMap(StringMap &&RHS)
|
|
: StringMapImpl(std::move(RHS)), Allocator(std::move(RHS.Allocator)) {}
|
|
|
|
StringMap &operator=(StringMap RHS) {
|
|
StringMapImpl::swap(RHS);
|
|
std::swap(Allocator, RHS.Allocator);
|
|
return *this;
|
|
}
|
|
|
|
// FIXME: Implement copy operations if/when they're needed.
|
|
|
|
AllocatorTy &getAllocator() { return Allocator; }
|
|
const AllocatorTy &getAllocator() const { return Allocator; }
|
|
|
|
typedef const char* key_type;
|
|
typedef ValueTy mapped_type;
|
|
typedef StringMapEntry<ValueTy> value_type;
|
|
typedef size_t size_type;
|
|
|
|
typedef StringMapConstIterator<ValueTy> const_iterator;
|
|
typedef StringMapIterator<ValueTy> iterator;
|
|
|
|
iterator begin() {
|
|
return iterator(TheTable, NumBuckets == 0);
|
|
}
|
|
iterator end() {
|
|
return iterator(TheTable+NumBuckets, true);
|
|
}
|
|
const_iterator begin() const {
|
|
return const_iterator(TheTable, NumBuckets == 0);
|
|
}
|
|
const_iterator end() const {
|
|
return const_iterator(TheTable+NumBuckets, true);
|
|
}
|
|
|
|
iterator find(StringRef Key) {
|
|
int Bucket = FindKey(Key);
|
|
if (Bucket == -1) return end();
|
|
return iterator(TheTable+Bucket, true);
|
|
}
|
|
|
|
const_iterator find(StringRef Key) const {
|
|
int Bucket = FindKey(Key);
|
|
if (Bucket == -1) return end();
|
|
return const_iterator(TheTable+Bucket, true);
|
|
}
|
|
|
|
/// lookup - Return the entry for the specified key, or a default
|
|
/// constructed value if no such entry exists.
|
|
ValueTy lookup(StringRef Key) const {
|
|
const_iterator it = find(Key);
|
|
if (it != end())
|
|
return it->second;
|
|
return ValueTy();
|
|
}
|
|
|
|
ValueTy &operator[](StringRef Key) {
|
|
return insert(std::make_pair(Key, ValueTy())).first->second;
|
|
}
|
|
|
|
/// count - Return 1 if the element is in the map, 0 otherwise.
|
|
size_type count(StringRef Key) const {
|
|
return find(Key) == end() ? 0 : 1;
|
|
}
|
|
|
|
/// insert - Insert the specified key/value pair into the map. If the key
|
|
/// already exists in the map, return false and ignore the request, otherwise
|
|
/// insert it and return true.
|
|
bool insert(MapEntryTy *KeyValue) {
|
|
unsigned BucketNo = LookupBucketFor(KeyValue->getKey());
|
|
StringMapEntryBase *&Bucket = TheTable[BucketNo];
|
|
if (Bucket && Bucket != getTombstoneVal())
|
|
return false; // Already exists in map.
|
|
|
|
if (Bucket == getTombstoneVal())
|
|
--NumTombstones;
|
|
Bucket = KeyValue;
|
|
++NumItems;
|
|
assert(NumItems + NumTombstones <= NumBuckets);
|
|
|
|
RehashTable();
|
|
return true;
|
|
}
|
|
|
|
/// insert - Inserts the specified key/value pair into the map if the key
|
|
/// isn't already in the map. The bool component of the returned pair is true
|
|
/// if and only if the insertion takes place, and the iterator component of
|
|
/// the pair points to the element with key equivalent to the key of the pair.
|
|
std::pair<iterator, bool> insert(std::pair<StringRef, ValueTy> KV) {
|
|
unsigned BucketNo = LookupBucketFor(KV.first);
|
|
StringMapEntryBase *&Bucket = TheTable[BucketNo];
|
|
if (Bucket && Bucket != getTombstoneVal())
|
|
return std::make_pair(iterator(TheTable + BucketNo, false),
|
|
false); // Already exists in map.
|
|
|
|
if (Bucket == getTombstoneVal())
|
|
--NumTombstones;
|
|
Bucket =
|
|
MapEntryTy::Create(KV.first, Allocator, std::move(KV.second));
|
|
++NumItems;
|
|
assert(NumItems + NumTombstones <= NumBuckets);
|
|
|
|
BucketNo = RehashTable(BucketNo);
|
|
return std::make_pair(iterator(TheTable + BucketNo, false), true);
|
|
}
|
|
|
|
// clear - Empties out the StringMap
|
|
void clear() {
|
|
if (empty()) return;
|
|
|
|
// Zap all values, resetting the keys back to non-present (not tombstone),
|
|
// which is safe because we're removing all elements.
|
|
for (unsigned I = 0, E = NumBuckets; I != E; ++I) {
|
|
StringMapEntryBase *&Bucket = TheTable[I];
|
|
if (Bucket && Bucket != getTombstoneVal()) {
|
|
static_cast<MapEntryTy*>(Bucket)->Destroy(Allocator);
|
|
}
|
|
Bucket = nullptr;
|
|
}
|
|
|
|
NumItems = 0;
|
|
NumTombstones = 0;
|
|
}
|
|
|
|
/// remove - Remove the specified key/value pair from the map, but do not
|
|
/// erase it. This aborts if the key is not in the map.
|
|
void remove(MapEntryTy *KeyValue) {
|
|
RemoveKey(KeyValue);
|
|
}
|
|
|
|
void erase(iterator I) {
|
|
MapEntryTy &V = *I;
|
|
remove(&V);
|
|
V.Destroy(Allocator);
|
|
}
|
|
|
|
bool erase(StringRef Key) {
|
|
iterator I = find(Key);
|
|
if (I == end()) return false;
|
|
erase(I);
|
|
return true;
|
|
}
|
|
|
|
~StringMap() {
|
|
// Delete all the elements in the map, but don't reset the elements
|
|
// to default values. This is a copy of clear(), but avoids unnecessary
|
|
// work not required in the destructor.
|
|
if (!empty()) {
|
|
for (unsigned I = 0, E = NumBuckets; I != E; ++I) {
|
|
StringMapEntryBase *Bucket = TheTable[I];
|
|
if (Bucket && Bucket != getTombstoneVal()) {
|
|
static_cast<MapEntryTy*>(Bucket)->Destroy(Allocator);
|
|
}
|
|
}
|
|
}
|
|
free(TheTable);
|
|
}
|
|
};
|
|
|
|
|
|
template<typename ValueTy>
|
|
class StringMapConstIterator {
|
|
protected:
|
|
StringMapEntryBase **Ptr;
|
|
public:
|
|
typedef StringMapEntry<ValueTy> value_type;
|
|
|
|
StringMapConstIterator() : Ptr(nullptr) { }
|
|
|
|
explicit StringMapConstIterator(StringMapEntryBase **Bucket,
|
|
bool NoAdvance = false)
|
|
: Ptr(Bucket) {
|
|
if (!NoAdvance) AdvancePastEmptyBuckets();
|
|
}
|
|
|
|
const value_type &operator*() const {
|
|
return *static_cast<StringMapEntry<ValueTy>*>(*Ptr);
|
|
}
|
|
const value_type *operator->() const {
|
|
return static_cast<StringMapEntry<ValueTy>*>(*Ptr);
|
|
}
|
|
|
|
bool operator==(const StringMapConstIterator &RHS) const {
|
|
return Ptr == RHS.Ptr;
|
|
}
|
|
bool operator!=(const StringMapConstIterator &RHS) const {
|
|
return Ptr != RHS.Ptr;
|
|
}
|
|
|
|
inline StringMapConstIterator& operator++() { // Preincrement
|
|
++Ptr;
|
|
AdvancePastEmptyBuckets();
|
|
return *this;
|
|
}
|
|
StringMapConstIterator operator++(int) { // Postincrement
|
|
StringMapConstIterator tmp = *this; ++*this; return tmp;
|
|
}
|
|
|
|
private:
|
|
void AdvancePastEmptyBuckets() {
|
|
while (*Ptr == nullptr || *Ptr == StringMapImpl::getTombstoneVal())
|
|
++Ptr;
|
|
}
|
|
};
|
|
|
|
template<typename ValueTy>
|
|
class StringMapIterator : public StringMapConstIterator<ValueTy> {
|
|
public:
|
|
StringMapIterator() {}
|
|
explicit StringMapIterator(StringMapEntryBase **Bucket,
|
|
bool NoAdvance = false)
|
|
: StringMapConstIterator<ValueTy>(Bucket, NoAdvance) {
|
|
}
|
|
StringMapEntry<ValueTy> &operator*() const {
|
|
return *static_cast<StringMapEntry<ValueTy>*>(*this->Ptr);
|
|
}
|
|
StringMapEntry<ValueTy> *operator->() const {
|
|
return static_cast<StringMapEntry<ValueTy>*>(*this->Ptr);
|
|
}
|
|
};
|
|
|
|
}
|
|
|
|
#endif
|