136 lines
4.4 KiB
C++
136 lines
4.4 KiB
C++
//===- llvm/ADT/DenseMapInfo.h - Type traits for DenseMap -------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines DenseMapInfo traits for DenseMap.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ADT_DENSEMAPINFO_H
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#define LLVM_ADT_DENSEMAPINFO_H
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#include "llvm/Support/PointerLikeTypeTraits.h"
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#include <utility>
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namespace llvm {
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template<typename T>
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struct DenseMapInfo {
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//static inline T getEmptyKey();
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//static inline T getTombstoneKey();
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//static unsigned getHashValue(const T &Val);
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//static bool isEqual(const T &LHS, const T &RHS);
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//static bool isPod()
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};
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// Provide DenseMapInfo for all pointers.
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template<typename T>
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struct DenseMapInfo<T*> {
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static inline T* getEmptyKey() {
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intptr_t Val = -1;
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Val <<= PointerLikeTypeTraits<T*>::NumLowBitsAvailable;
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return reinterpret_cast<T*>(Val);
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}
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static inline T* getTombstoneKey() {
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intptr_t Val = -2;
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Val <<= PointerLikeTypeTraits<T*>::NumLowBitsAvailable;
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return reinterpret_cast<T*>(Val);
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}
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static unsigned getHashValue(const T *PtrVal) {
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return (unsigned((uintptr_t)PtrVal) >> 4) ^
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(unsigned((uintptr_t)PtrVal) >> 9);
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}
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static bool isEqual(const T *LHS, const T *RHS) { return LHS == RHS; }
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static bool isPod() { return true; }
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};
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// Provide DenseMapInfo for chars.
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template<> struct DenseMapInfo<char> {
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static inline char getEmptyKey() { return ~0; }
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static inline char getTombstoneKey() { return ~0 - 1; }
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static unsigned getHashValue(const char& Val) { return Val * 37; }
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static bool isPod() { return true; }
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static bool isEqual(const char &LHS, const char &RHS) {
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return LHS == RHS;
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}
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};
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// Provide DenseMapInfo for unsigned ints.
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template<> struct DenseMapInfo<unsigned> {
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static inline unsigned getEmptyKey() { return ~0; }
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static inline unsigned getTombstoneKey() { return ~0U - 1; }
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static unsigned getHashValue(const unsigned& Val) { return Val * 37; }
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static bool isPod() { return true; }
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static bool isEqual(const unsigned& LHS, const unsigned& RHS) {
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return LHS == RHS;
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}
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};
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// Provide DenseMapInfo for unsigned longs.
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template<> struct DenseMapInfo<unsigned long> {
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static inline unsigned long getEmptyKey() { return ~0UL; }
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static inline unsigned long getTombstoneKey() { return ~0UL - 1L; }
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static unsigned getHashValue(const unsigned long& Val) {
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return Val * 37UL;
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}
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static bool isPod() { return true; }
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static bool isEqual(const unsigned long& LHS, const unsigned long& RHS) {
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return LHS == RHS;
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}
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};
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// Provide DenseMapInfo for unsigned long longs.
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template<> struct DenseMapInfo<unsigned long long> {
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static inline unsigned long long getEmptyKey() { return ~0ULL; }
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static inline unsigned long long getTombstoneKey() { return ~0ULL - 1ULL; }
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static unsigned getHashValue(const unsigned long long& Val) {
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return (unsigned)Val * 37ULL;
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}
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static bool isPod() { return true; }
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static bool isEqual(const unsigned long long& LHS,
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const unsigned long long& RHS) {
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return LHS == RHS;
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}
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};
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// Provide DenseMapInfo for all pairs whose members have info.
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template<typename T, typename U>
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struct DenseMapInfo<std::pair<T, U> > {
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typedef std::pair<T, U> Pair;
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typedef DenseMapInfo<T> FirstInfo;
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typedef DenseMapInfo<U> SecondInfo;
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static inline Pair getEmptyKey() {
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return std::make_pair(FirstInfo::getEmptyKey(),
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SecondInfo::getEmptyKey());
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}
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static inline Pair getTombstoneKey() {
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return std::make_pair(FirstInfo::getTombstoneKey(),
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SecondInfo::getEmptyKey());
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}
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static unsigned getHashValue(const Pair& PairVal) {
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uint64_t key = (uint64_t)FirstInfo::getHashValue(PairVal.first) << 32
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| (uint64_t)SecondInfo::getHashValue(PairVal.second);
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key += ~(key << 32);
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key ^= (key >> 22);
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key += ~(key << 13);
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key ^= (key >> 8);
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key += (key << 3);
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key ^= (key >> 15);
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key += ~(key << 27);
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key ^= (key >> 31);
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return (unsigned)key;
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}
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static bool isEqual(const Pair& LHS, const Pair& RHS) { return LHS == RHS; }
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static bool isPod() { return FirstInfo::isPod() && SecondInfo::isPod(); }
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};
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} // end namespace llvm
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#endif
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