1// Protocol Buffers - Google's data interchange format
2// Copyright 2008 Google Inc. All rights reserved.
3// https://developers.google.com/protocol-buffers/
4//
5// Redistribution and use in source and binary forms, with or without
6// modification, are permitted provided that the following conditions are
7// met:
8//
9// * Redistributions of source code must retain the above copyright
10// notice, this list of conditions and the following disclaimer.
11// * Redistributions in binary form must reproduce the above
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13// in the documentation and/or other materials provided with the
14// distribution.
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17// this software without specific prior written permission.
18//
19// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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29// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30
31#ifndef GOOGLE_PROTOBUF_STUBS_LOGGING_H_
32#define GOOGLE_PROTOBUF_STUBS_LOGGING_H_
33
34#include <google/protobuf/stubs/macros.h>
35#include <google/protobuf/stubs/port.h>
36
37#include <google/protobuf/port_def.inc>
38
39// ===================================================================
40// emulates google3/base/logging.h
41
42namespace google {
43namespace protobuf {
44
45enum LogLevel {
46 LOGLEVEL_INFO, // Informational. This is never actually used by
47 // libprotobuf.
48 LOGLEVEL_WARNING, // Warns about issues that, although not technically a
49 // problem now, could cause problems in the future. For
50 // example, a // warning will be printed when parsing a
51 // message that is near the message size limit.
52 LOGLEVEL_ERROR, // An error occurred which should never happen during
53 // normal use.
54 LOGLEVEL_FATAL, // An error occurred from which the library cannot
55 // recover. This usually indicates a programming error
56 // in the code which calls the library, especially when
57 // compiled in debug mode.
58
59#ifdef NDEBUG
60 LOGLEVEL_DFATAL = LOGLEVEL_ERROR
61#else
62 LOGLEVEL_DFATAL = LOGLEVEL_FATAL
63#endif
64};
65
66class StringPiece;
67namespace util {
68class Status;
69}
70class uint128;
71namespace internal {
72
73class LogFinisher;
74
75class PROTOBUF_EXPORT LogMessage {
76 public:
77 LogMessage(LogLevel level, const char* filename, int line);
78 ~LogMessage();
79
80 LogMessage& operator<<(const std::string& value);
81 LogMessage& operator<<(const char* value);
82 LogMessage& operator<<(char value);
83 LogMessage& operator<<(int value);
84 LogMessage& operator<<(uint value);
85 LogMessage& operator<<(long value);
86 LogMessage& operator<<(unsigned long value);
87 LogMessage& operator<<(long long value);
88 LogMessage& operator<<(unsigned long long value);
89 LogMessage& operator<<(double value);
90 LogMessage& operator<<(void* value);
91 LogMessage& operator<<(const StringPiece& value);
92 LogMessage& operator<<(const util::Status& status);
93 LogMessage& operator<<(const uint128& value);
94
95 private:
96 friend class LogFinisher;
97 void Finish();
98
99 LogLevel level_;
100 const char* filename_;
101 int line_;
102 std::string message_;
103};
104
105// Used to make the entire "LOG(BLAH) << etc." expression have a void return
106// type and print a newline after each message.
107class PROTOBUF_EXPORT LogFinisher {
108 public:
109 void operator=(LogMessage& other);
110};
111
112template<typename T>
113bool IsOk(T status) { return status.ok(); }
114template<>
115inline bool IsOk(bool status) { return status; }
116
117} // namespace internal
118
119// Undef everything in case we're being mixed with some other Google library
120// which already defined them itself. Presumably all Google libraries will
121// support the same syntax for these so it should not be a big deal if they
122// end up using our definitions instead.
123#undef GOOGLE_LOG
124#undef GOOGLE_LOG_IF
125
126#undef GOOGLE_CHECK
127#undef GOOGLE_CHECK_OK
128#undef GOOGLE_CHECK_EQ
129#undef GOOGLE_CHECK_NE
130#undef GOOGLE_CHECK_LT
131#undef GOOGLE_CHECK_LE
132#undef GOOGLE_CHECK_GT
133#undef GOOGLE_CHECK_GE
134#undef GOOGLE_CHECK_NOTNULL
135
136#undef GOOGLE_DLOG
137#undef GOOGLE_DCHECK
138#undef GOOGLE_DCHECK_OK
139#undef GOOGLE_DCHECK_EQ
140#undef GOOGLE_DCHECK_NE
141#undef GOOGLE_DCHECK_LT
142#undef GOOGLE_DCHECK_LE
143#undef GOOGLE_DCHECK_GT
144#undef GOOGLE_DCHECK_GE
145
146#define GOOGLE_LOG(LEVEL) \
147 ::google::protobuf::internal::LogFinisher() = \
148 ::google::protobuf::internal::LogMessage( \
149 ::google::protobuf::LOGLEVEL_##LEVEL, __FILE__, __LINE__)
150#define GOOGLE_LOG_IF(LEVEL, CONDITION) \
151 !(CONDITION) ? (void)0 : GOOGLE_LOG(LEVEL)
152
153#define GOOGLE_CHECK(EXPRESSION) \
154 GOOGLE_LOG_IF(FATAL, !(EXPRESSION)) << "CHECK failed: " #EXPRESSION ": "
155#define GOOGLE_CHECK_OK(A) GOOGLE_CHECK(::google::protobuf::internal::IsOk(A))
156#define GOOGLE_CHECK_EQ(A, B) GOOGLE_CHECK((A) == (B))
157#define GOOGLE_CHECK_NE(A, B) GOOGLE_CHECK((A) != (B))
158#define GOOGLE_CHECK_LT(A, B) GOOGLE_CHECK((A) < (B))
159#define GOOGLE_CHECK_LE(A, B) GOOGLE_CHECK((A) <= (B))
160#define GOOGLE_CHECK_GT(A, B) GOOGLE_CHECK((A) > (B))
161#define GOOGLE_CHECK_GE(A, B) GOOGLE_CHECK((A) >= (B))
162
163namespace internal {
164template<typename T>
165T* CheckNotNull(const char* /* file */, int /* line */,
166 const char* name, T* val) {
167 if (val == nullptr) {
168 GOOGLE_LOG(FATAL) << name;
169 }
170 return val;
171}
172} // namespace internal
173#define GOOGLE_CHECK_NOTNULL(A) \
174 ::google::protobuf::internal::CheckNotNull( \
175 __FILE__, __LINE__, "'" #A "' must not be nullptr", (A))
176
177#ifdef NDEBUG
178
179#define GOOGLE_DLOG(LEVEL) GOOGLE_LOG_IF(LEVEL, false)
180
181#define GOOGLE_DCHECK(EXPRESSION) while(false) GOOGLE_CHECK(EXPRESSION)
182#define GOOGLE_DCHECK_OK(E) GOOGLE_DCHECK(::google::protobuf::internal::IsOk(E))
183#define GOOGLE_DCHECK_EQ(A, B) GOOGLE_DCHECK((A) == (B))
184#define GOOGLE_DCHECK_NE(A, B) GOOGLE_DCHECK((A) != (B))
185#define GOOGLE_DCHECK_LT(A, B) GOOGLE_DCHECK((A) < (B))
186#define GOOGLE_DCHECK_LE(A, B) GOOGLE_DCHECK((A) <= (B))
187#define GOOGLE_DCHECK_GT(A, B) GOOGLE_DCHECK((A) > (B))
188#define GOOGLE_DCHECK_GE(A, B) GOOGLE_DCHECK((A) >= (B))
189
190#else // NDEBUG
191
192#define GOOGLE_DLOG GOOGLE_LOG
193
194#define GOOGLE_DCHECK GOOGLE_CHECK
195#define GOOGLE_DCHECK_OK GOOGLE_CHECK_OK
196#define GOOGLE_DCHECK_EQ GOOGLE_CHECK_EQ
197#define GOOGLE_DCHECK_NE GOOGLE_CHECK_NE
198#define GOOGLE_DCHECK_LT GOOGLE_CHECK_LT
199#define GOOGLE_DCHECK_LE GOOGLE_CHECK_LE
200#define GOOGLE_DCHECK_GT GOOGLE_CHECK_GT
201#define GOOGLE_DCHECK_GE GOOGLE_CHECK_GE
202
203#endif // !NDEBUG
204
205typedef void LogHandler(LogLevel level, const char* filename, int line,
206 const std::string& message);
207
208// The protobuf library sometimes writes warning and error messages to
209// stderr. These messages are primarily useful for developers, but may
210// also help end users figure out a problem. If you would prefer that
211// these messages be sent somewhere other than stderr, call SetLogHandler()
212// to set your own handler. This returns the old handler. Set the handler
213// to nullptr to ignore log messages (but see also LogSilencer, below).
214//
215// Obviously, SetLogHandler is not thread-safe. You should only call it
216// at initialization time, and probably not from library code. If you
217// simply want to suppress log messages temporarily (e.g. because you
218// have some code that tends to trigger them frequently and you know
219// the warnings are not important to you), use the LogSilencer class
220// below.
221PROTOBUF_EXPORT LogHandler* SetLogHandler(LogHandler* new_func);
222
223// Create a LogSilencer if you want to temporarily suppress all log
224// messages. As long as any LogSilencer objects exist, non-fatal
225// log messages will be discarded (the current LogHandler will *not*
226// be called). Constructing a LogSilencer is thread-safe. You may
227// accidentally suppress log messages occurring in another thread, but
228// since messages are generally for debugging purposes only, this isn't
229// a big deal. If you want to intercept log messages, use SetLogHandler().
230class PROTOBUF_EXPORT LogSilencer {
231 public:
232 LogSilencer();
233 ~LogSilencer();
234};
235
236} // namespace protobuf
237} // namespace google
238
239#include <google/protobuf/port_undef.inc>
240
241#endif // GOOGLE_PROTOBUF_STUBS_LOGGING_H_
242

source code of include/google/protobuf/stubs/logging.h