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
|
// Copyright 2022 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/log/globals.h"
#include <stddef.h>
#include <stdint.h>
#include <atomic>
#include "absl/base/attributes.h"
#include "absl/base/config.h"
#include "absl/base/internal/atomic_hook.h"
#include "absl/base/log_severity.h"
#include "absl/hash/hash.h"
#include "absl/strings/string_view.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace {
// These atomics represent logging library configuration.
// Integer types are used instead of absl::LogSeverity to ensure that a
// lock-free std::atomic is used when possible.
ABSL_CONST_INIT std::atomic<int> min_log_level{
static_cast<int>(absl::LogSeverityAtLeast::kInfo)};
ABSL_CONST_INIT std::atomic<int> stderrthreshold{
static_cast<int>(absl::LogSeverityAtLeast::kError)};
// We evaluate this value as a hash comparison to avoid having to
// hold a mutex or make a copy (to access the value of a string-typed flag) in
// very hot codepath.
ABSL_CONST_INIT std::atomic<size_t> log_backtrace_at_hash{0};
ABSL_CONST_INIT std::atomic<bool> prepend_log_prefix{true};
ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES
absl::base_internal::AtomicHook<log_internal::LoggingGlobalsListener>
logging_globals_listener;
size_t HashSiteForLogBacktraceAt(absl::string_view file, int line) {
return absl::HashOf(file, line);
}
void TriggerLoggingGlobalsListener() {
auto* listener = logging_globals_listener.Load();
if (listener != nullptr) listener();
}
} // namespace
namespace log_internal {
void RawSetMinLogLevel(absl::LogSeverityAtLeast severity) {
min_log_level.store(static_cast<int>(severity), std::memory_order_release);
}
void RawSetStderrThreshold(absl::LogSeverityAtLeast severity) {
stderrthreshold.store(static_cast<int>(severity), std::memory_order_release);
}
void RawEnableLogPrefix(bool on_off) {
prepend_log_prefix.store(on_off, std::memory_order_release);
}
void SetLoggingGlobalsListener(LoggingGlobalsListener l) {
logging_globals_listener.Store(l);
}
} // namespace log_internal
absl::LogSeverityAtLeast MinLogLevel() {
return static_cast<absl::LogSeverityAtLeast>(
min_log_level.load(std::memory_order_acquire));
}
void SetMinLogLevel(absl::LogSeverityAtLeast severity) {
log_internal::RawSetMinLogLevel(severity);
TriggerLoggingGlobalsListener();
}
namespace log_internal {
ScopedMinLogLevel::ScopedMinLogLevel(absl::LogSeverityAtLeast severity)
: saved_severity_(absl::MinLogLevel()) {
absl::SetMinLogLevel(severity);
}
ScopedMinLogLevel::~ScopedMinLogLevel() {
absl::SetMinLogLevel(saved_severity_);
}
} // namespace log_internal
absl::LogSeverityAtLeast StderrThreshold() {
return static_cast<absl::LogSeverityAtLeast>(
stderrthreshold.load(std::memory_order_acquire));
}
void SetStderrThreshold(absl::LogSeverityAtLeast severity) {
log_internal::RawSetStderrThreshold(severity);
TriggerLoggingGlobalsListener();
}
ScopedStderrThreshold::ScopedStderrThreshold(absl::LogSeverityAtLeast severity)
: saved_severity_(absl::StderrThreshold()) {
absl::SetStderrThreshold(severity);
}
ScopedStderrThreshold::~ScopedStderrThreshold() {
absl::SetStderrThreshold(saved_severity_);
}
namespace log_internal {
bool ShouldLogBacktraceAt(absl::string_view file, int line) {
const size_t flag_hash =
log_backtrace_at_hash.load(std::memory_order_acquire);
return flag_hash != 0 && flag_hash == HashSiteForLogBacktraceAt(file, line);
}
} // namespace log_internal
void SetLogBacktraceLocation(absl::string_view file, int line) {
log_backtrace_at_hash.store(HashSiteForLogBacktraceAt(file, line),
std::memory_order_release);
}
bool ShouldPrependLogPrefix() {
return prepend_log_prefix.load(std::memory_order_acquire);
}
void EnableLogPrefix(bool on_off) {
log_internal::RawEnableLogPrefix(on_off);
TriggerLoggingGlobalsListener();
}
ABSL_NAMESPACE_END
} // namespace absl
|
