1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
//===- llvm/ADT/MapVector.h - Map w/ deterministic value order --*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements a map that provides insertion order iteration. The
// interface is purposefully minimal. The key is assumed to be cheap to copy
// and 2 copies are kept, one for indexing in a DenseMap, one for iteration in
// a std::vector.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_ADT_MAPVECTOR_H
#define LLVM_ADT_MAPVECTOR_H
#include "llvm/ADT/DenseMap.h"
#include <vector>
namespace llvm {
/// This class implements a map that also provides access to all stored values
/// in a deterministic order. The values are kept in a std::vector and the
/// mapping is done with DenseMap from Keys to indexes in that vector.
template<typename KeyT, typename ValueT,
typename MapType = llvm::DenseMap<KeyT, unsigned>,
typename VectorType = std::vector<std::pair<KeyT, ValueT> > >
class MapVector {
typedef typename VectorType::size_type SizeType;
MapType Map;
VectorType Vector;
public:
typedef typename VectorType::iterator iterator;
typedef typename VectorType::const_iterator const_iterator;
SizeType size() const {
return Vector.size();
}
iterator begin() {
return Vector.begin();
}
const_iterator begin() const {
return Vector.begin();
}
iterator end() {
return Vector.end();
}
const_iterator end() const {
return Vector.end();
}
bool empty() const {
return Vector.empty();
}
std::pair<KeyT, ValueT> &front() { return Vector.front(); }
const std::pair<KeyT, ValueT> &front() const { return Vector.front(); }
std::pair<KeyT, ValueT> &back() { return Vector.back(); }
const std::pair<KeyT, ValueT> &back() const { return Vector.back(); }
void clear() {
Map.clear();
Vector.clear();
}
ValueT &operator[](const KeyT &Key) {
std::pair<KeyT, unsigned> Pair = std::make_pair(Key, 0);
std::pair<typename MapType::iterator, bool> Result = Map.insert(Pair);
unsigned &I = Result.first->second;
if (Result.second) {
Vector.push_back(std::make_pair(Key, ValueT()));
I = Vector.size() - 1;
}
return Vector[I].second;
}
ValueT lookup(const KeyT &Key) const {
typename MapType::const_iterator Pos = Map.find(Key);
return Pos == Map.end()? ValueT() : Vector[Pos->second].second;
}
std::pair<iterator, bool> insert(const std::pair<KeyT, ValueT> &KV) {
std::pair<KeyT, unsigned> Pair = std::make_pair(KV.first, 0);
std::pair<typename MapType::iterator, bool> Result = Map.insert(Pair);
unsigned &I = Result.first->second;
if (Result.second) {
Vector.push_back(std::make_pair(KV.first, KV.second));
I = Vector.size() - 1;
return std::make_pair(std::prev(end()), true);
}
return std::make_pair(begin() + I, false);
}
unsigned count(const KeyT &Key) const {
typename MapType::const_iterator Pos = Map.find(Key);
return Pos == Map.end()? 0 : 1;
}
iterator find(const KeyT &Key) {
typename MapType::const_iterator Pos = Map.find(Key);
return Pos == Map.end()? Vector.end() :
(Vector.begin() + Pos->second);
}
const_iterator find(const KeyT &Key) const {
typename MapType::const_iterator Pos = Map.find(Key);
return Pos == Map.end()? Vector.end() :
(Vector.begin() + Pos->second);
}
/// \brief Remove the last element from the vector.
void pop_back() {
typename MapType::iterator Pos = Map.find(Vector.back().first);
Map.erase(Pos);
Vector.pop_back();
}
};
}
#endif
|
