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of the empty key for U. This shouldn't really matter because the tombstone key for the pair was still distinct from every other key, but it is odd. Patch by Michael Ilseman! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136336 91177308-0d34-0410-b5e6-96231b3b80d8
169 lines
5.4 KiB
C++
169 lines
5.4 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 "llvm/Support/type_traits.h"
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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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};
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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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};
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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 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 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 (unsigned)(Val * 37UL);
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}
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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 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 ints.
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template<> struct DenseMapInfo<int> {
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static inline int getEmptyKey() { return 0x7fffffff; }
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static inline int getTombstoneKey() { return -0x7fffffff - 1; }
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static unsigned getHashValue(const int& Val) { return (unsigned)(Val * 37); }
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static bool isEqual(const int& LHS, const int& RHS) {
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return LHS == RHS;
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}
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};
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// Provide DenseMapInfo for longs.
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template<> struct DenseMapInfo<long> {
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static inline long getEmptyKey() {
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return (1UL << (sizeof(long) * 8 - 1)) - 1L;
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}
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static inline long getTombstoneKey() { return getEmptyKey() - 1L; }
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static unsigned getHashValue(const long& Val) {
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return (unsigned)(Val * 37L);
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}
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static bool isEqual(const long& LHS, const long& RHS) {
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return LHS == RHS;
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}
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};
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// Provide DenseMapInfo for long longs.
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template<> struct DenseMapInfo<long long> {
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static inline long long getEmptyKey() { return 0x7fffffffffffffffLL; }
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static inline long long getTombstoneKey() { return -0x7fffffffffffffffLL-1; }
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static unsigned getHashValue(const long long& Val) {
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return (unsigned)(Val * 37LL);
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}
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static bool isEqual(const long long& LHS,
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const 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::getTombstoneKey());
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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) {
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return FirstInfo::isEqual(LHS.first, RHS.first) &&
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SecondInfo::isEqual(LHS.second, RHS.second);
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}
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};
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} // end namespace llvm
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#endif
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