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
|
// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Logging and checks. Avoids a dependency on base.
//
// LOG(tag) prints messages. Tags are INFO, WARNING, ERROR and FATAL.
// INFO prints to stdout, the others to stderr. FATAL aborts after printing.
//
// LOG_IF(tag, predicate) logs if predicate evaluates to true, else silent.
//
// VLOG(level) logs INFO messages where level is less than or equal to the
// verbosity level set with SetVerbose().
//
// VLOG_IF(level, predicate) logs INFO if predicate evaluates to true,
// else silent.
//
// CHECK(predicate) logs a FATAL error if predicate is false.
// NOTREACHED() always aborts.
// Log streams can be changed with SetStreams(). Logging is not thread-safe.
//
#ifndef TOOLS_RELOCATION_PACKER_SRC_DEBUG_H_
#define TOOLS_RELOCATION_PACKER_SRC_DEBUG_H_
#include <limits.h>
#include <ostream>
#include <sstream>
namespace relocation_packer {
class Logger {
public:
enum Severity {INFO = 0, WARNING, ERROR, FATAL};
// Construct a new message logger. Prints if level is less than or
// equal to the level set with SetVerbose() and predicate is true.
// |severity| is an enumerated severity.
// |level| is the verbosity level.
// |predicate| controls if the logger prints or is silent.
Logger(Severity severity, int level, bool predicate);
// On destruction, flush and print the strings accumulated in stream_.
~Logger();
// Return the stream for this logger.
std::ostream& GetStream() { return stream_; }
// Set verbosity level. Messages with a level less than or equal to
// this level are printed, others are discarded. Static, not thread-safe.
static void SetVerbose(int level) { max_level_ = level; }
// Set info and error logging streams. Static, not thread-safe.
static void SetStreams(std::ostream* info_stream,
std::ostream* error_stream) {
info_stream_ = info_stream;
error_stream_ = error_stream;
}
// Reset to initial state.
static void Reset();
private:
// Message severity, verbosity level, and predicate.
Severity severity_;
int level_;
bool predicate_;
// String stream, accumulates message text.
std::ostringstream stream_;
// Verbosity for INFO messages. Not thread-safe.
static int max_level_;
// Logging streams. Not thread-safe.
static std::ostream* info_stream_;
static std::ostream* error_stream_;
};
} // namespace relocation_packer
// Make logging severities visible globally.
typedef relocation_packer::Logger::Severity LogSeverity;
// LOG(severity) prints a message with the given severity, and aborts if
// severity is FATAL. LOG_IF(severity, predicate) does the same but only if
// predicate is true. INT_MIN is guaranteed to be less than or equal to
// any verbosity level.
#define LOG(severity) \
(relocation_packer::Logger(relocation_packer::Logger::severity, INT_MIN, \
true) \
.GetStream())
#define LOG_IF(severity, predicate) \
(relocation_packer::Logger(relocation_packer::Logger::severity, INT_MIN, \
(predicate)) \
.GetStream())
// VLOG(level) prints its message as INFO if level is less than or equal to
// the current verbosity level.
#define VLOG(level) \
(relocation_packer::Logger(relocation_packer::Logger::INFO, (level), true) \
.GetStream())
#define VLOG_IF(level, predicate) \
(relocation_packer::Logger(relocation_packer::Logger::INFO, (level), \
(predicate)) \
.GetStream())
// CHECK(predicate) fails with a FATAL log message if predicate is false.
#define CHECK(predicate) (LOG_IF(FATAL, !(predicate)) \
<< __FILE__ << ":" << __LINE__ << ": " \
<< __FUNCTION__ << ": CHECK '" #predicate "' failed")
// NOTREACHED() always fails with a FATAL log message.
#define NOTREACHED(_) (LOG(FATAL) \
<< __FILE__ << ":" << __LINE__ << ": " \
<< __FUNCTION__ << ": NOTREACHED() hit")
#endif // TOOLS_RELOCATION_PACKER_SRC_DEBUG_H_
|
