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
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
|
//===- llvm/Support/Chrono.h - Utilities for Timing Manipulation-*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_CHRONO_H
#define LLVM_SUPPORT_CHRONO_H
#include "llvm/Support/Compiler.h"
#include "llvm/Support/FormatProviders.h"
#include <chrono>
#include <ctime>
namespace llvm {
class raw_ostream;
namespace sys {
/// A time point on the system clock. This is provided for two reasons:
/// - to insulate us agains subtle differences in behavoir to differences in
/// system clock precision (which is implementation-defined and differs between
/// platforms).
/// - to shorten the type name
/// The default precision is nanoseconds. If need a specific precision specify
/// it explicitly. If unsure, use the default. If you need a time point on a
/// clock other than the system_clock, use std::chrono directly.
template <typename D = std::chrono::nanoseconds>
using TimePoint = std::chrono::time_point<std::chrono::system_clock, D>;
/// Convert a TimePoint to std::time_t
inline std::time_t toTimeT(TimePoint<> TP) {
using namespace std::chrono;
return system_clock::to_time_t(
time_point_cast<system_clock::time_point::duration>(TP));
}
/// Convert a std::time_t to a TimePoint
inline TimePoint<std::chrono::seconds>
toTimePoint(std::time_t T) {
using namespace std::chrono;
return time_point_cast<seconds>(system_clock::from_time_t(T));
}
/// Convert a std::time_t + nanoseconds to a TimePoint
inline TimePoint<>
toTimePoint(std::time_t T, uint32_t nsec) {
using namespace std::chrono;
return time_point_cast<nanoseconds>(system_clock::from_time_t(T))
+ nanoseconds(nsec);
}
} // namespace sys
raw_ostream &operator<<(raw_ostream &OS, sys::TimePoint<> TP);
/// Format provider for TimePoint<>
///
/// The options string is a strftime format string, with extensions:
/// - %L is millis: 000-999
/// - %f is micros: 000000-999999
/// - %N is nanos: 000000000 - 999999999
///
/// If no options are given, the default format is "%Y-%m-%d %H:%M:%S.%N".
template <>
struct format_provider<sys::TimePoint<>> {
static void format(const sys::TimePoint<> &TP, llvm::raw_ostream &OS,
StringRef Style);
};
namespace detail {
template <typename Period> struct unit { static const char value[]; };
template <typename Period> const char unit<Period>::value[] = "";
template <> struct unit<std::ratio<3600>> { static const char value[]; };
template <> struct unit<std::ratio<60>> { static const char value[]; };
template <> struct unit<std::ratio<1>> { static const char value[]; };
template <> struct unit<std::milli> { static const char value[]; };
template <> struct unit<std::micro> { static const char value[]; };
template <> struct unit<std::nano> { static const char value[]; };
} // namespace detail
/// Implementation of format_provider<T> for duration types.
///
/// The options string of a duration type has the grammar:
///
/// duration_options ::= [unit][show_unit [number_options]]
/// unit ::= `h`|`m`|`s`|`ms|`us`|`ns`
/// show_unit ::= `+` | `-`
/// number_options ::= options string for a integral or floating point type
///
/// Examples
/// =================================
/// | options | Input | Output |
/// =================================
/// | "" | 1s | 1 s |
/// | "ms" | 1s | 1000 ms |
/// | "ms-" | 1s | 1000 |
/// | "ms-n" | 1s | 1,000 |
/// | "" | 1.0s | 1.00 s |
/// =================================
///
/// If the unit of the duration type is not one of the units specified above,
/// it is still possible to format it, provided you explicitly request a
/// display unit or you request that the unit is not displayed.
template <typename Rep, typename Period>
struct format_provider<std::chrono::duration<Rep, Period>> {
private:
typedef std::chrono::duration<Rep, Period> Dur;
typedef std::conditional_t<std::chrono::treat_as_floating_point<Rep>::value,
double, intmax_t>
InternalRep;
template <typename AsPeriod> static InternalRep getAs(const Dur &D) {
using namespace std::chrono;
return duration_cast<duration<InternalRep, AsPeriod>>(D).count();
}
static std::pair<InternalRep, StringRef> consumeUnit(StringRef &Style,
const Dur &D) {
using namespace std::chrono;
if (Style.consume_front("ns"))
return {getAs<std::nano>(D), "ns"};
if (Style.consume_front("us"))
return {getAs<std::micro>(D), "us"};
if (Style.consume_front("ms"))
return {getAs<std::milli>(D), "ms"};
if (Style.consume_front("s"))
return {getAs<std::ratio<1>>(D), "s"};
if (Style.consume_front("m"))
return {getAs<std::ratio<60>>(D), "m"};
if (Style.consume_front("h"))
return {getAs<std::ratio<3600>>(D), "h"};
return {D.count(), detail::unit<Period>::value};
}
static bool consumeShowUnit(StringRef &Style) {
if (Style.empty())
return true;
if (Style.consume_front("-"))
return false;
if (Style.consume_front("+"))
return true;
assert(0 && "Unrecognised duration format");
return true;
}
public:
static void format(const Dur &D, llvm::raw_ostream &Stream, StringRef Style) {
InternalRep count;
StringRef unit;
std::tie(count, unit) = consumeUnit(Style, D);
bool show_unit = consumeShowUnit(Style);
format_provider<InternalRep>::format(count, Stream, Style);
if (show_unit) {
assert(!unit.empty());
Stream << " " << unit;
}
}
};
} // namespace llvm
#endif // LLVM_SUPPORT_CHRONO_H
|
