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// Copyright (c) 1999, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Author: Ray Sidney
//
// This file contains #include information about logging-related stuff.
// Pretty much everybody needs to #include this file so that they can
// log various happenings.
//
#ifndef _LOGGING_H_
#define _LOGGING_H_
#include <errno.h>
#include <string.h>
#include <time.h>
#include <iosfwd>
#include <ostream>
#include <sstream>
#include <string>
#if 1
# include <unistd.h>
#endif
#include <vector>
#if defined(_MSC_VER)
#define GLOG_MSVC_PUSH_DISABLE_WARNING(n) __pragma(warning(push)) \
__pragma(warning(disable:n))
#define GLOG_MSVC_POP_WARNING() __pragma(warning(pop))
#else
#define GLOG_MSVC_PUSH_DISABLE_WARNING(n)
#define GLOG_MSVC_POP_WARNING()
#endif
// Annoying stuff for windows -- makes sure clients can import these functions
#ifndef GOOGLE_GLOG_DLL_DECL
# if defined(_WIN32) && !defined(__CYGWIN__)
# define GOOGLE_GLOG_DLL_DECL __declspec(dllimport)
# else
# define GOOGLE_GLOG_DLL_DECL
# endif
#endif
// We care a lot about number of bits things take up. Unfortunately,
// systems define their bit-specific ints in a lot of different ways.
// We use our own way, and have a typedef to get there.
// Note: these commands below may look like "#if 1" or "#if 0", but
// that's because they were constructed that way at ./configure time.
// Look at logging.h.in to see how they're calculated (based on your config).
#if 1
#include <stdint.h> // the normal place uint16_t is defined
#endif
#if 1
#include <sys/types.h> // the normal place u_int16_t is defined
#endif
#if 1
#include <inttypes.h> // a third place for uint16_t or u_int16_t
#endif
#if 0
#include <gflags/gflags.h>
#endif
namespace google {
#if 1 // the C99 format
typedef int32_t int32;
typedef uint32_t uint32;
typedef int64_t int64;
typedef uint64_t uint64;
#elif 1 // the BSD format
typedef int32_t int32;
typedef u_int32_t uint32;
typedef int64_t int64;
typedef u_int64_t uint64;
#elif 0 // the windows (vc7) format
typedef __int32 int32;
typedef unsigned __int32 uint32;
typedef __int64 int64;
typedef unsigned __int64 uint64;
#else
#error Do not know how to define a 32-bit integer quantity on your system
#endif
}
// The global value of GOOGLE_STRIP_LOG. All the messages logged to
// LOG(XXX) with severity less than GOOGLE_STRIP_LOG will not be displayed.
// If it can be determined at compile time that the message will not be
// printed, the statement will be compiled out.
//
// Example: to strip out all INFO and WARNING messages, use the value
// of 2 below. To make an exception for WARNING messages from a single
// file, add "#define GOOGLE_STRIP_LOG 1" to that file _before_ including
// base/logging.h
#ifndef GOOGLE_STRIP_LOG
#define GOOGLE_STRIP_LOG 0
#endif
// GCC can be told that a certain branch is not likely to be taken (for
// instance, a CHECK failure), and use that information in static analysis.
// Giving it this information can help it optimize for the common case in
// the absence of better information (ie. -fprofile-arcs).
//
#ifndef GOOGLE_PREDICT_BRANCH_NOT_TAKEN
#if 1
#define GOOGLE_PREDICT_BRANCH_NOT_TAKEN(x) (__builtin_expect(x, 0))
#else
#define GOOGLE_PREDICT_BRANCH_NOT_TAKEN(x) x
#endif
#endif
#ifndef GOOGLE_PREDICT_FALSE
#if 1
#define GOOGLE_PREDICT_FALSE(x) (__builtin_expect(x, 0))
#else
#define GOOGLE_PREDICT_FALSE(x) x
#endif
#endif
#ifndef GOOGLE_PREDICT_TRUE
#if 1
#define GOOGLE_PREDICT_TRUE(x) (__builtin_expect(!!(x), 1))
#else
#define GOOGLE_PREDICT_TRUE(x) x
#endif
#endif
// Make a bunch of macros for logging. The way to log things is to stream
// things to LOG(<a particular severity level>). E.g.,
//
// LOG(INFO) << "Found " << num_cookies << " cookies";
//
// You can capture log messages in a string, rather than reporting them
// immediately:
//
// vector<string> errors;
// LOG_STRING(ERROR, &errors) << "Couldn't parse cookie #" << cookie_num;
//
// This pushes back the new error onto 'errors'; if given a NULL pointer,
// it reports the error via LOG(ERROR).
//
// You can also do conditional logging:
//
// LOG_IF(INFO, num_cookies > 10) << "Got lots of cookies";
//
// You can also do occasional logging (log every n'th occurrence of an
// event):
//
// LOG_EVERY_N(INFO, 10) << "Got the " << google::COUNTER << "th cookie";
//
// The above will cause log messages to be output on the 1st, 11th, 21st, ...
// times it is executed. Note that the special google::COUNTER value is used
// to identify which repetition is happening.
//
// You can also do occasional conditional logging (log every n'th
// occurrence of an event, when condition is satisfied):
//
// LOG_IF_EVERY_N(INFO, (size > 1024), 10) << "Got the " << google::COUNTER
// << "th big cookie";
//
// You can log messages the first N times your code executes a line. E.g.
//
// LOG_FIRST_N(INFO, 20) << "Got the " << google::COUNTER << "th cookie";
//
// Outputs log messages for the first 20 times it is executed.
//
// Analogous SYSLOG, SYSLOG_IF, and SYSLOG_EVERY_N macros are available.
// These log to syslog as well as to the normal logs. If you use these at
// all, you need to be aware that syslog can drastically reduce performance,
// especially if it is configured for remote logging! Don't use these
// unless you fully understand this and have a concrete need to use them.
// Even then, try to minimize your use of them.
//
// There are also "debug mode" logging macros like the ones above:
//
// DLOG(INFO) << "Found cookies";
//
// DLOG_IF(INFO, num_cookies > 10) << "Got lots of cookies";
//
// DLOG_EVERY_N(INFO, 10) << "Got the " << google::COUNTER << "th cookie";
//
// All "debug mode" logging is compiled away to nothing for non-debug mode
// compiles.
//
// We also have
//
// LOG_ASSERT(assertion);
// DLOG_ASSERT(assertion);
//
// which is syntactic sugar for {,D}LOG_IF(FATAL, assert fails) << assertion;
//
// There are "verbose level" logging macros. They look like
//
// VLOG(1) << "I'm printed when you run the program with --v=1 or more";
// VLOG(2) << "I'm printed when you run the program with --v=2 or more";
//
// These always log at the INFO log level (when they log at all).
// The verbose logging can also be turned on module-by-module. For instance,
// --vmodule=mapreduce=2,file=1,gfs*=3 --v=0
// will cause:
// a. VLOG(2) and lower messages to be printed from mapreduce.{h,cc}
// b. VLOG(1) and lower messages to be printed from file.{h,cc}
// c. VLOG(3) and lower messages to be printed from files prefixed with "gfs"
// d. VLOG(0) and lower messages to be printed from elsewhere
//
// The wildcarding functionality shown by (c) supports both '*' (match
// 0 or more characters) and '?' (match any single character) wildcards.
//
// There's also VLOG_IS_ON(n) "verbose level" condition macro. To be used as
//
// if (VLOG_IS_ON(2)) {
// // do some logging preparation and logging
// // that can't be accomplished with just VLOG(2) << ...;
// }
//
// There are also VLOG_IF, VLOG_EVERY_N and VLOG_IF_EVERY_N "verbose level"
// condition macros for sample cases, when some extra computation and
// preparation for logs is not needed.
// VLOG_IF(1, (size > 1024))
// << "I'm printed when size is more than 1024 and when you run the "
// "program with --v=1 or more";
// VLOG_EVERY_N(1, 10)
// << "I'm printed every 10th occurrence, and when you run the program "
// "with --v=1 or more. Present occurence is " << google::COUNTER;
// VLOG_IF_EVERY_N(1, (size > 1024), 10)
// << "I'm printed on every 10th occurence of case when size is more "
// " than 1024, when you run the program with --v=1 or more. ";
// "Present occurence is " << google::COUNTER;
//
// The supported severity levels for macros that allow you to specify one
// are (in increasing order of severity) INFO, WARNING, ERROR, and FATAL.
// Note that messages of a given severity are logged not only in the
// logfile for that severity, but also in all logfiles of lower severity.
// E.g., a message of severity FATAL will be logged to the logfiles of
// severity FATAL, ERROR, WARNING, and INFO.
//
// There is also the special severity of DFATAL, which logs FATAL in
// debug mode, ERROR in normal mode.
//
// Very important: logging a message at the FATAL severity level causes
// the program to terminate (after the message is logged).
//
// Unless otherwise specified, logs will be written to the filename
// "<program name>.<hostname>.<user name>.log.<severity level>.", followed
// by the date, time, and pid (you can't prevent the date, time, and pid
// from being in the filename).
//
// The logging code takes two flags:
// --v=# set the verbose level
// --logtostderr log all the messages to stderr instead of to logfiles
// LOG LINE PREFIX FORMAT
//
// Log lines have this form:
//
// Lmmdd hh:mm:ss.uuuuuu threadid file:line] msg...
//
// where the fields are defined as follows:
//
// L A single character, representing the log level
// (eg 'I' for INFO)
// mm The month (zero padded; ie May is '05')
// dd The day (zero padded)
// hh:mm:ss.uuuuuu Time in hours, minutes and fractional seconds
// threadid The space-padded thread ID as returned by GetTID()
// (this matches the PID on Linux)
// file The file name
// line The line number
// msg The user-supplied message
//
// Example:
//
// I1103 11:57:31.739339 24395 google.cc:2341] Command line: ./some_prog
// I1103 11:57:31.739403 24395 google.cc:2342] Process id 24395
//
// NOTE: although the microseconds are useful for comparing events on
// a single machine, clocks on different machines may not be well
// synchronized. Hence, use caution when comparing the low bits of
// timestamps from different machines.
#ifndef DECLARE_VARIABLE
#define MUST_UNDEF_GFLAGS_DECLARE_MACROS
#define DECLARE_VARIABLE(type, shorttype, name, tn) \
namespace fL##shorttype { \
extern GOOGLE_GLOG_DLL_DECL type FLAGS_##name; \
} \
using fL##shorttype::FLAGS_##name
// bool specialization
#define DECLARE_bool(name) \
DECLARE_VARIABLE(bool, B, name, bool)
// int32 specialization
#define DECLARE_int32(name) \
DECLARE_VARIABLE(google::int32, I, name, int32)
// Special case for string, because we have to specify the namespace
// std::string, which doesn't play nicely with our FLAG__namespace hackery.
#define DECLARE_string(name) \
namespace fLS { \
extern GOOGLE_GLOG_DLL_DECL std::string& FLAGS_##name; \
} \
using fLS::FLAGS_##name
#endif
// Set whether log messages go to stderr instead of logfiles
DECLARE_bool(logtostderr);
// Set whether log messages go to stderr in addition to logfiles.
DECLARE_bool(alsologtostderr);
// Set color messages logged to stderr (if supported by terminal).
DECLARE_bool(colorlogtostderr);
// Log messages at a level >= this flag are automatically sent to
// stderr in addition to log files.
DECLARE_int32(stderrthreshold);
// Set whether the log prefix should be prepended to each line of output.
DECLARE_bool(log_prefix);
// Log messages at a level <= this flag are buffered.
// Log messages at a higher level are flushed immediately.
DECLARE_int32(logbuflevel);
// Sets the maximum number of seconds which logs may be buffered for.
DECLARE_int32(logbufsecs);
// Log suppression level: messages logged at a lower level than this
// are suppressed.
DECLARE_int32(minloglevel);
// If specified, logfiles are written into this directory instead of the
// default logging directory.
DECLARE_string(log_dir);
// Set the log file mode.
DECLARE_int32(logfile_mode);
// Sets the path of the directory into which to put additional links
// to the log files.
DECLARE_string(log_link);
DECLARE_int32(v); // in vlog_is_on.cc
// Sets the maximum log file size (in MB).
DECLARE_int32(max_log_size);
// Sets whether to avoid logging to the disk if the disk is full.
DECLARE_bool(stop_logging_if_full_disk);
#ifdef MUST_UNDEF_GFLAGS_DECLARE_MACROS
#undef MUST_UNDEF_GFLAGS_DECLARE_MACROS
#undef DECLARE_VARIABLE
#undef DECLARE_bool
#undef DECLARE_int32
#undef DECLARE_string
#endif
// Log messages below the GOOGLE_STRIP_LOG level will be compiled away for
// security reasons. See LOG(severtiy) below.
// A few definitions of macros that don't generate much code. Since
// LOG(INFO) and its ilk are used all over our code, it's
// better to have compact code for these operations.
#if GOOGLE_STRIP_LOG == 0
#define COMPACT_GOOGLE_LOG_INFO google::LogMessage( \
__FILE__, __LINE__)
#define LOG_TO_STRING_INFO(message) google::LogMessage( \
__FILE__, __LINE__, google::GLOG_INFO, message)
#else
#define COMPACT_GOOGLE_LOG_INFO google::NullStream()
#define LOG_TO_STRING_INFO(message) google::NullStream()
#endif
#if GOOGLE_STRIP_LOG <= 1
#define COMPACT_GOOGLE_LOG_WARNING google::LogMessage( \
__FILE__, __LINE__, google::GLOG_WARNING)
#define LOG_TO_STRING_WARNING(message) google::LogMessage( \
__FILE__, __LINE__, google::GLOG_WARNING, message)
#else
#define COMPACT_GOOGLE_LOG_WARNING google::NullStream()
#define LOG_TO_STRING_WARNING(message) google::NullStream()
#endif
#if GOOGLE_STRIP_LOG <= 2
#define COMPACT_GOOGLE_LOG_ERROR google::LogMessage( \
__FILE__, __LINE__, google::GLOG_ERROR)
#define LOG_TO_STRING_ERROR(message) google::LogMessage( \
__FILE__, __LINE__, google::GLOG_ERROR, message)
#else
#define COMPACT_GOOGLE_LOG_ERROR google::NullStream()
#define LOG_TO_STRING_ERROR(message) google::NullStream()
#endif
#if GOOGLE_STRIP_LOG <= 3
#define COMPACT_GOOGLE_LOG_FATAL google::LogMessageFatal( \
__FILE__, __LINE__)
#define LOG_TO_STRING_FATAL(message) google::LogMessage( \
__FILE__, __LINE__, google::GLOG_FATAL, message)
#else
#define COMPACT_GOOGLE_LOG_FATAL google::NullStreamFatal()
#define LOG_TO_STRING_FATAL(message) google::NullStreamFatal()
#endif
#if defined(NDEBUG) && !defined(DCHECK_ALWAYS_ON)
#define DCHECK_IS_ON() 0
#else
#define DCHECK_IS_ON() 1
#endif
// For DFATAL, we want to use LogMessage (as opposed to
// LogMessageFatal), to be consistent with the original behavior.
#if !DCHECK_IS_ON()
#define COMPACT_GOOGLE_LOG_DFATAL COMPACT_GOOGLE_LOG_ERROR
#elif GOOGLE_STRIP_LOG <= 3
#define COMPACT_GOOGLE_LOG_DFATAL google::LogMessage( \
__FILE__, __LINE__, google::GLOG_FATAL)
#else
#define COMPACT_GOOGLE_LOG_DFATAL google::NullStreamFatal()
#endif
#define GOOGLE_LOG_INFO(counter) google::LogMessage(__FILE__, __LINE__, google::GLOG_INFO, counter, &google::LogMessage::SendToLog)
#define SYSLOG_INFO(counter) \
google::LogMessage(__FILE__, __LINE__, google::GLOG_INFO, counter, \
&google::LogMessage::SendToSyslogAndLog)
#define GOOGLE_LOG_WARNING(counter) \
google::LogMessage(__FILE__, __LINE__, google::GLOG_WARNING, counter, \
&google::LogMessage::SendToLog)
#define SYSLOG_WARNING(counter) \
google::LogMessage(__FILE__, __LINE__, google::GLOG_WARNING, counter, \
&google::LogMessage::SendToSyslogAndLog)
#define GOOGLE_LOG_ERROR(counter) \
google::LogMessage(__FILE__, __LINE__, google::GLOG_ERROR, counter, \
&google::LogMessage::SendToLog)
#define SYSLOG_ERROR(counter) \
google::LogMessage(__FILE__, __LINE__, google::GLOG_ERROR, counter, \
&google::LogMessage::SendToSyslogAndLog)
#define GOOGLE_LOG_FATAL(counter) \
google::LogMessage(__FILE__, __LINE__, google::GLOG_FATAL, counter, \
&google::LogMessage::SendToLog)
#define SYSLOG_FATAL(counter) \
google::LogMessage(__FILE__, __LINE__, google::GLOG_FATAL, counter, \
&google::LogMessage::SendToSyslogAndLog)
#define GOOGLE_LOG_DFATAL(counter) \
google::LogMessage(__FILE__, __LINE__, google::DFATAL_LEVEL, counter, \
&google::LogMessage::SendToLog)
#define SYSLOG_DFATAL(counter) \
google::LogMessage(__FILE__, __LINE__, google::DFATAL_LEVEL, counter, \
&google::LogMessage::SendToSyslogAndLog)
#if defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__) || defined(__CYGWIN32__)
// A very useful logging macro to log windows errors:
#define LOG_SYSRESULT(result) \
if (FAILED(HRESULT_FROM_WIN32(result))) { \
LPSTR message = NULL; \
LPSTR msg = reinterpret_cast<LPSTR>(&message); \
DWORD message_length = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER | \
FORMAT_MESSAGE_FROM_SYSTEM, \
0, result, 0, msg, 100, NULL); \
if (message_length > 0) { \
google::LogMessage(__FILE__, __LINE__, google::GLOG_ERROR, 0, \
&google::LogMessage::SendToLog).stream() \
<< reinterpret_cast<const char*>(message); \
LocalFree(message); \
} \
}
#endif
// We use the preprocessor's merging operator, "##", so that, e.g.,
// LOG(INFO) becomes the token GOOGLE_LOG_INFO. There's some funny
// subtle difference between ostream member streaming functions (e.g.,
// ostream::operator<<(int) and ostream non-member streaming functions
// (e.g., ::operator<<(ostream&, string&): it turns out that it's
// impossible to stream something like a string directly to an unnamed
// ostream. We employ a neat hack by calling the stream() member
// function of LogMessage which seems to avoid the problem.
#define LOG(severity) COMPACT_GOOGLE_LOG_ ## severity.stream()
#define SYSLOG(severity) SYSLOG_ ## severity(0).stream()
namespace google {
// They need the definitions of integer types.
#include "glog/log_severity.h"
#include "glog/vlog_is_on.h"
// Initialize google's logging library. You will see the program name
// specified by argv0 in log outputs.
GOOGLE_GLOG_DLL_DECL void InitGoogleLogging(const char* argv0);
// Shutdown google's logging library.
GOOGLE_GLOG_DLL_DECL void ShutdownGoogleLogging();
// Install a function which will be called after LOG(FATAL).
GOOGLE_GLOG_DLL_DECL void InstallFailureFunction(void (*fail_func)());
class LogSink; // defined below
// If a non-NULL sink pointer is given, we push this message to that sink.
// For LOG_TO_SINK we then do normal LOG(severity) logging as well.
// This is useful for capturing messages and passing/storing them
// somewhere more specific than the global log of the process.
// Argument types:
// LogSink* sink;
// LogSeverity severity;
// The cast is to disambiguate NULL arguments.
#define LOG_TO_SINK(sink, severity) \
google::LogMessage( \
__FILE__, __LINE__, \
google::GLOG_ ## severity, \
static_cast<google::LogSink*>(sink), true).stream()
#define LOG_TO_SINK_BUT_NOT_TO_LOGFILE(sink, severity) \
google::LogMessage( \
__FILE__, __LINE__, \
google::GLOG_ ## severity, \
static_cast<google::LogSink*>(sink), false).stream()
// If a non-NULL string pointer is given, we write this message to that string.
// We then do normal LOG(severity) logging as well.
// This is useful for capturing messages and storing them somewhere more
// specific than the global log of the process.
// Argument types:
// string* message;
// LogSeverity severity;
// The cast is to disambiguate NULL arguments.
// NOTE: LOG(severity) expands to LogMessage().stream() for the specified
// severity.
#define LOG_TO_STRING(severity, message) \
LOG_TO_STRING_##severity(static_cast<string*>(message)).stream()
// If a non-NULL pointer is given, we push the message onto the end
// of a vector of strings; otherwise, we report it with LOG(severity).
// This is handy for capturing messages and perhaps passing them back
// to the caller, rather than reporting them immediately.
// Argument types:
// LogSeverity severity;
// vector<string> *outvec;
// The cast is to disambiguate NULL arguments.
#define LOG_STRING(severity, outvec) \
LOG_TO_STRING_##severity(static_cast<std::vector<std::string>*>(outvec)).stream()
#define LOG_IF(severity, condition) \
!(condition) ? (void) 0 : google::LogMessageVoidify() & LOG(severity)
#define SYSLOG_IF(severity, condition) \
!(condition) ? (void) 0 : google::LogMessageVoidify() & SYSLOG(severity)
#define LOG_ASSERT(condition) \
LOG_IF(FATAL, !(condition)) << "Assert failed: " #condition
#define SYSLOG_ASSERT(condition) \
SYSLOG_IF(FATAL, !(condition)) << "Assert failed: " #condition
// CHECK dies with a fatal error if condition is not true. It is *not*
// controlled by DCHECK_IS_ON(), so the check will be executed regardless of
// compilation mode. Therefore, it is safe to do things like:
// CHECK(fp->Write(x) == 4)
#define CHECK(condition) \
LOG_IF(FATAL, GOOGLE_PREDICT_BRANCH_NOT_TAKEN(!(condition))) \
<< "Check failed: " #condition " "
// A container for a string pointer which can be evaluated to a bool -
// true iff the pointer is NULL.
struct CheckOpString {
CheckOpString(std::string* str) : str_(str) { }
// No destructor: if str_ is non-NULL, we're about to LOG(FATAL),
// so there's no point in cleaning up str_.
operator bool() const {
return GOOGLE_PREDICT_BRANCH_NOT_TAKEN(str_ != NULL);
}
std::string* str_;
};
// Function is overloaded for integral types to allow static const
// integrals declared in classes and not defined to be used as arguments to
// CHECK* macros. It's not encouraged though.
template <class T>
inline const T& GetReferenceableValue(const T& t) { return t; }
inline char GetReferenceableValue(char t) { return t; }
inline unsigned char GetReferenceableValue(unsigned char t) { return t; }
inline signed char GetReferenceableValue(signed char t) { return t; }
inline short GetReferenceableValue(short t) { return t; }
inline unsigned short GetReferenceableValue(unsigned short t) { return t; }
inline int GetReferenceableValue(int t) { return t; }
inline unsigned int GetReferenceableValue(unsigned int t) { return t; }
inline long GetReferenceableValue(long t) { return t; }
inline unsigned long GetReferenceableValue(unsigned long t) { return t; }
inline long long GetReferenceableValue(long long t) { return t; }
inline unsigned long long GetReferenceableValue(unsigned long long t) {
return t;
}
// This is a dummy class to define the following operator.
struct DummyClassToDefineOperator {};
}
// Define global operator<< to declare using ::operator<<.
// This declaration will allow use to use CHECK macros for user
// defined classes which have operator<< (e.g., stl_logging.h).
inline std::ostream& operator<<(
std::ostream& out, const google::DummyClassToDefineOperator&) {
return out;
}
namespace google {
// This formats a value for a failing CHECK_XX statement. Ordinarily,
// it uses the definition for operator<<, with a few special cases below.
template <typename T>
inline void MakeCheckOpValueString(std::ostream* os, const T& v) {
(*os) << v;
}
// Overrides for char types provide readable values for unprintable
// characters.
template <> GOOGLE_GLOG_DLL_DECL
void MakeCheckOpValueString(std::ostream* os, const char& v);
template <> GOOGLE_GLOG_DLL_DECL
void MakeCheckOpValueString(std::ostream* os, const signed char& v);
template <> GOOGLE_GLOG_DLL_DECL
void MakeCheckOpValueString(std::ostream* os, const unsigned char& v);
// Build the error message string. Specify no inlining for code size.
template <typename T1, typename T2>
std::string* MakeCheckOpString(const T1& v1, const T2& v2, const char* exprtext)
__attribute__ ((noinline));
namespace base {
namespace internal {
// If "s" is less than base_logging::INFO, returns base_logging::INFO.
// If "s" is greater than base_logging::FATAL, returns
// base_logging::ERROR. Otherwise, returns "s".
LogSeverity NormalizeSeverity(LogSeverity s);
} // namespace internal
// A helper class for formatting "expr (V1 vs. V2)" in a CHECK_XX
// statement. See MakeCheckOpString for sample usage. Other
// approaches were considered: use of a template method (e.g.,
// base::BuildCheckOpString(exprtext, base::Print<T1>, &v1,
// base::Print<T2>, &v2), however this approach has complications
// related to volatile arguments and function-pointer arguments).
class GOOGLE_GLOG_DLL_DECL CheckOpMessageBuilder {
public:
// Inserts "exprtext" and " (" to the stream.
explicit CheckOpMessageBuilder(const char *exprtext);
// Deletes "stream_".
~CheckOpMessageBuilder();
// For inserting the first variable.
std::ostream* ForVar1() { return stream_; }
// For inserting the second variable (adds an intermediate " vs. ").
std::ostream* ForVar2();
// Get the result (inserts the closing ")").
std::string* NewString();
private:
std::ostringstream *stream_;
};
} // namespace base
template <typename T1, typename T2>
std::string* MakeCheckOpString(const T1& v1, const T2& v2, const char* exprtext) {
base::CheckOpMessageBuilder comb(exprtext);
MakeCheckOpValueString(comb.ForVar1(), v1);
MakeCheckOpValueString(comb.ForVar2(), v2);
return comb.NewString();
}
// Helper functions for CHECK_OP macro.
// The (int, int) specialization works around the issue that the compiler
// will not instantiate the template version of the function on values of
// unnamed enum type - see comment below.
#define DEFINE_CHECK_OP_IMPL(name, op) \
template <typename T1, typename T2> \
inline std::string* name##Impl(const T1& v1, const T2& v2, \
const char* exprtext) { \
if (GOOGLE_PREDICT_TRUE(v1 op v2)) return NULL; \
else return MakeCheckOpString(v1, v2, exprtext); \
} \
inline std::string* name##Impl(int v1, int v2, const char* exprtext) { \
return name##Impl<int, int>(v1, v2, exprtext); \
}
// We use the full name Check_EQ, Check_NE, etc. in case the file including
// base/logging.h provides its own #defines for the simpler names EQ, NE, etc.
// This happens if, for example, those are used as token names in a
// yacc grammar.
DEFINE_CHECK_OP_IMPL(Check_EQ, ==) // Compilation error with CHECK_EQ(NULL, x)?
DEFINE_CHECK_OP_IMPL(Check_NE, !=) // Use CHECK(x == NULL) instead.
DEFINE_CHECK_OP_IMPL(Check_LE, <=)
DEFINE_CHECK_OP_IMPL(Check_LT, < )
DEFINE_CHECK_OP_IMPL(Check_GE, >=)
DEFINE_CHECK_OP_IMPL(Check_GT, > )
#undef DEFINE_CHECK_OP_IMPL
// Helper macro for binary operators.
// Don't use this macro directly in your code, use CHECK_EQ et al below.
#if defined(STATIC_ANALYSIS)
// Only for static analysis tool to know that it is equivalent to assert
#define CHECK_OP_LOG(name, op, val1, val2, log) CHECK((val1) op (val2))
#elif DCHECK_IS_ON()
// In debug mode, avoid constructing CheckOpStrings if possible,
// to reduce the overhead of CHECK statments by 2x.
// Real DCHECK-heavy tests have seen 1.5x speedups.
// The meaning of "string" might be different between now and
// when this macro gets invoked (e.g., if someone is experimenting
// with other string implementations that get defined after this
// file is included). Save the current meaning now and use it
// in the macro.
typedef std::string _Check_string;
#define CHECK_OP_LOG(name, op, val1, val2, log) \
while (google::_Check_string* _result = \
google::Check##name##Impl( \
google::GetReferenceableValue(val1), \
google::GetReferenceableValue(val2), \
#val1 " " #op " " #val2)) \
log(__FILE__, __LINE__, \
google::CheckOpString(_result)).stream()
#else
// In optimized mode, use CheckOpString to hint to compiler that
// the while condition is unlikely.
#define CHECK_OP_LOG(name, op, val1, val2, log) \
while (google::CheckOpString _result = \
google::Check##name##Impl( \
google::GetReferenceableValue(val1), \
google::GetReferenceableValue(val2), \
#val1 " " #op " " #val2)) \
log(__FILE__, __LINE__, _result).stream()
#endif // STATIC_ANALYSIS, DCHECK_IS_ON()
#if GOOGLE_STRIP_LOG <= 3
#define CHECK_OP(name, op, val1, val2) \
CHECK_OP_LOG(name, op, val1, val2, google::LogMessageFatal)
#else
#define CHECK_OP(name, op, val1, val2) \
CHECK_OP_LOG(name, op, val1, val2, google::NullStreamFatal)
#endif // STRIP_LOG <= 3
// Equality/Inequality checks - compare two values, and log a FATAL message
// including the two values when the result is not as expected. The values
// must have operator<<(ostream, ...) defined.
//
// You may append to the error message like so:
// CHECK_NE(1, 2) << ": The world must be ending!";
//
// We are very careful to ensure that each argument is evaluated exactly
// once, and that anything which is legal to pass as a function argument is
// legal here. In particular, the arguments may be temporary expressions
// which will end up being destroyed at the end of the apparent statement,
// for example:
// CHECK_EQ(string("abc")[1], 'b');
//
// WARNING: These don't compile correctly if one of the arguments is a pointer
// and the other is NULL. To work around this, simply static_cast NULL to the
// type of the desired pointer.
#define CHECK_EQ(val1, val2) CHECK_OP(_EQ, ==, val1, val2)
#define CHECK_NE(val1, val2) CHECK_OP(_NE, !=, val1, val2)
#define CHECK_LE(val1, val2) CHECK_OP(_LE, <=, val1, val2)
#define CHECK_LT(val1, val2) CHECK_OP(_LT, < , val1, val2)
#define CHECK_GE(val1, val2) CHECK_OP(_GE, >=, val1, val2)
#define CHECK_GT(val1, val2) CHECK_OP(_GT, > , val1, val2)
// Check that the input is non NULL. This very useful in constructor
// initializer lists.
#define CHECK_NOTNULL(val) \
google::CheckNotNull(__FILE__, __LINE__, "'" #val "' Must be non NULL", (val))
// Helper functions for string comparisons.
// To avoid bloat, the definitions are in logging.cc.
#define DECLARE_CHECK_STROP_IMPL(func, expected) \
GOOGLE_GLOG_DLL_DECL std::string* Check##func##expected##Impl( \
const char* s1, const char* s2, const char* names);
DECLARE_CHECK_STROP_IMPL(strcmp, true)
DECLARE_CHECK_STROP_IMPL(strcmp, false)
DECLARE_CHECK_STROP_IMPL(strcasecmp, true)
DECLARE_CHECK_STROP_IMPL(strcasecmp, false)
#undef DECLARE_CHECK_STROP_IMPL
// Helper macro for string comparisons.
// Don't use this macro directly in your code, use CHECK_STREQ et al below.
#define CHECK_STROP(func, op, expected, s1, s2) \
while (google::CheckOpString _result = \
google::Check##func##expected##Impl((s1), (s2), \
#s1 " " #op " " #s2)) \
LOG(FATAL) << *_result.str_
// String (char*) equality/inequality checks.
// CASE versions are case-insensitive.
//
// Note that "s1" and "s2" may be temporary strings which are destroyed
// by the compiler at the end of the current "full expression"
// (e.g. CHECK_STREQ(Foo().c_str(), Bar().c_str())).
#define CHECK_STREQ(s1, s2) CHECK_STROP(strcmp, ==, true, s1, s2)
#define CHECK_STRNE(s1, s2) CHECK_STROP(strcmp, !=, false, s1, s2)
#define CHECK_STRCASEEQ(s1, s2) CHECK_STROP(strcasecmp, ==, true, s1, s2)
#define CHECK_STRCASENE(s1, s2) CHECK_STROP(strcasecmp, !=, false, s1, s2)
#define CHECK_INDEX(I,A) CHECK(I < (sizeof(A)/sizeof(A[0])))
#define CHECK_BOUND(B,A) CHECK(B <= (sizeof(A)/sizeof(A[0])))
#define CHECK_DOUBLE_EQ(val1, val2) \
do { \
CHECK_LE((val1), (val2)+0.000000000000001L); \
CHECK_GE((val1), (val2)-0.000000000000001L); \
} while (0)
#define CHECK_NEAR(val1, val2, margin) \
do { \
CHECK_LE((val1), (val2)+(margin)); \
CHECK_GE((val1), (val2)-(margin)); \
} while (0)
// perror()..googly style!
//
// PLOG() and PLOG_IF() and PCHECK() behave exactly like their LOG* and
// CHECK equivalents with the addition that they postpend a description
// of the current state of errno to their output lines.
#define PLOG(severity) GOOGLE_PLOG(severity, 0).stream()
#define GOOGLE_PLOG(severity, counter) \
google::ErrnoLogMessage( \
__FILE__, __LINE__, google::GLOG_ ## severity, counter, \
&google::LogMessage::SendToLog)
#define PLOG_IF(severity, condition) \
!(condition) ? (void) 0 : google::LogMessageVoidify() & PLOG(severity)
// A CHECK() macro that postpends errno if the condition is false. E.g.
//
// if (poll(fds, nfds, timeout) == -1) { PCHECK(errno == EINTR); ... }
#define PCHECK(condition) \
PLOG_IF(FATAL, GOOGLE_PREDICT_BRANCH_NOT_TAKEN(!(condition))) \
<< "Check failed: " #condition " "
// A CHECK() macro that lets you assert the success of a function that
// returns -1 and sets errno in case of an error. E.g.
//
// CHECK_ERR(mkdir(path, 0700));
//
// or
//
// int fd = open(filename, flags); CHECK_ERR(fd) << ": open " << filename;
#define CHECK_ERR(invocation) \
PLOG_IF(FATAL, GOOGLE_PREDICT_BRANCH_NOT_TAKEN((invocation) == -1)) \
<< #invocation
// Use macro expansion to create, for each use of LOG_EVERY_N(), static
// variables with the __LINE__ expansion as part of the variable name.
#define LOG_EVERY_N_VARNAME(base, line) LOG_EVERY_N_VARNAME_CONCAT(base, line)
#define LOG_EVERY_N_VARNAME_CONCAT(base, line) base ## line
#define LOG_OCCURRENCES LOG_EVERY_N_VARNAME(occurrences_, __LINE__)
#define LOG_OCCURRENCES_MOD_N LOG_EVERY_N_VARNAME(occurrences_mod_n_, __LINE__)
#define SOME_KIND_OF_LOG_EVERY_N(severity, n, what_to_do) \
static int LOG_OCCURRENCES = 0, LOG_OCCURRENCES_MOD_N = 0; \
++LOG_OCCURRENCES; \
if (++LOG_OCCURRENCES_MOD_N > n) LOG_OCCURRENCES_MOD_N -= n; \
if (LOG_OCCURRENCES_MOD_N == 1) \
google::LogMessage( \
__FILE__, __LINE__, google::GLOG_ ## severity, LOG_OCCURRENCES, \
&what_to_do).stream()
#define SOME_KIND_OF_LOG_IF_EVERY_N(severity, condition, n, what_to_do) \
static int LOG_OCCURRENCES = 0, LOG_OCCURRENCES_MOD_N = 0; \
++LOG_OCCURRENCES; \
if (condition && \
((LOG_OCCURRENCES_MOD_N=(LOG_OCCURRENCES_MOD_N + 1) % n) == (1 % n))) \
google::LogMessage( \
__FILE__, __LINE__, google::GLOG_ ## severity, LOG_OCCURRENCES, \
&what_to_do).stream()
#define SOME_KIND_OF_PLOG_EVERY_N(severity, n, what_to_do) \
static int LOG_OCCURRENCES = 0, LOG_OCCURRENCES_MOD_N = 0; \
++LOG_OCCURRENCES; \
if (++LOG_OCCURRENCES_MOD_N > n) LOG_OCCURRENCES_MOD_N -= n; \
if (LOG_OCCURRENCES_MOD_N == 1) \
google::ErrnoLogMessage( \
__FILE__, __LINE__, google::GLOG_ ## severity, LOG_OCCURRENCES, \
&what_to_do).stream()
#define SOME_KIND_OF_LOG_FIRST_N(severity, n, what_to_do) \
static int LOG_OCCURRENCES = 0; \
if (LOG_OCCURRENCES <= n) \
++LOG_OCCURRENCES; \
if (LOG_OCCURRENCES <= n) \
google::LogMessage( \
__FILE__, __LINE__, google::GLOG_ ## severity, LOG_OCCURRENCES, \
&what_to_do).stream()
namespace glog_internal_namespace_ {
template <bool>
struct CompileAssert {
};
struct CrashReason;
// Returns true if FailureSignalHandler is installed.
bool IsFailureSignalHandlerInstalled();
} // namespace glog_internal_namespace_
#define GOOGLE_GLOG_COMPILE_ASSERT(expr, msg) \
typedef google::glog_internal_namespace_::CompileAssert<(bool(expr))> msg[bool(expr) ? 1 : -1]
#define LOG_EVERY_N(severity, n) \
GOOGLE_GLOG_COMPILE_ASSERT(google::GLOG_ ## severity < \
google::NUM_SEVERITIES, \
INVALID_REQUESTED_LOG_SEVERITY); \
SOME_KIND_OF_LOG_EVERY_N(severity, (n), google::LogMessage::SendToLog)
#define SYSLOG_EVERY_N(severity, n) \
SOME_KIND_OF_LOG_EVERY_N(severity, (n), google::LogMessage::SendToSyslogAndLog)
#define PLOG_EVERY_N(severity, n) \
SOME_KIND_OF_PLOG_EVERY_N(severity, (n), google::LogMessage::SendToLog)
#define LOG_FIRST_N(severity, n) \
SOME_KIND_OF_LOG_FIRST_N(severity, (n), google::LogMessage::SendToLog)
#define LOG_IF_EVERY_N(severity, condition, n) \
SOME_KIND_OF_LOG_IF_EVERY_N(severity, (condition), (n), google::LogMessage::SendToLog)
// We want the special COUNTER value available for LOG_EVERY_X()'ed messages
enum PRIVATE_Counter {COUNTER};
#ifdef GLOG_NO_ABBREVIATED_SEVERITIES
// wingdi.h defines ERROR to be 0. When we call LOG(ERROR), it gets
// substituted with 0, and it expands to COMPACT_GOOGLE_LOG_0. To allow us
// to keep using this syntax, we define this macro to do the same thing
// as COMPACT_GOOGLE_LOG_ERROR.
#define COMPACT_GOOGLE_LOG_0 COMPACT_GOOGLE_LOG_ERROR
#define SYSLOG_0 SYSLOG_ERROR
#define LOG_TO_STRING_0 LOG_TO_STRING_ERROR
// Needed for LOG_IS_ON(ERROR).
const LogSeverity GLOG_0 = GLOG_ERROR;
#else
// Users may include windows.h after logging.h without
// GLOG_NO_ABBREVIATED_SEVERITIES nor WIN32_LEAN_AND_MEAN.
// For this case, we cannot detect if ERROR is defined before users
// actually use ERROR. Let's make an undefined symbol to warn users.
# define GLOG_ERROR_MSG ERROR_macro_is_defined_Define_GLOG_NO_ABBREVIATED_SEVERITIES_before_including_logging_h_See_the_document_for_detail
# define COMPACT_GOOGLE_LOG_0 GLOG_ERROR_MSG
# define SYSLOG_0 GLOG_ERROR_MSG
# define LOG_TO_STRING_0 GLOG_ERROR_MSG
# define GLOG_0 GLOG_ERROR_MSG
#endif
// Plus some debug-logging macros that get compiled to nothing for production
#if DCHECK_IS_ON()
#define DLOG(severity) LOG(severity)
#define DVLOG(verboselevel) VLOG(verboselevel)
#define DLOG_IF(severity, condition) LOG_IF(severity, condition)
#define DLOG_EVERY_N(severity, n) LOG_EVERY_N(severity, n)
#define DLOG_IF_EVERY_N(severity, condition, n) \
LOG_IF_EVERY_N(severity, condition, n)
#define DLOG_ASSERT(condition) LOG_ASSERT(condition)
// debug-only checking. executed if DCHECK_IS_ON().
#define DCHECK(condition) CHECK(condition)
#define DCHECK_EQ(val1, val2) CHECK_EQ(val1, val2)
#define DCHECK_NE(val1, val2) CHECK_NE(val1, val2)
#define DCHECK_LE(val1, val2) CHECK_LE(val1, val2)
#define DCHECK_LT(val1, val2) CHECK_LT(val1, val2)
#define DCHECK_GE(val1, val2) CHECK_GE(val1, val2)
#define DCHECK_GT(val1, val2) CHECK_GT(val1, val2)
#define DCHECK_NOTNULL(val) CHECK_NOTNULL(val)
#define DCHECK_STREQ(str1, str2) CHECK_STREQ(str1, str2)
#define DCHECK_STRCASEEQ(str1, str2) CHECK_STRCASEEQ(str1, str2)
#define DCHECK_STRNE(str1, str2) CHECK_STRNE(str1, str2)
#define DCHECK_STRCASENE(str1, str2) CHECK_STRCASENE(str1, str2)
#else // !DCHECK_IS_ON()
#define DLOG(severity) \
true ? (void) 0 : google::LogMessageVoidify() & LOG(severity)
#define DVLOG(verboselevel) \
(true || !VLOG_IS_ON(verboselevel)) ?\
(void) 0 : google::LogMessageVoidify() & LOG(INFO)
#define DLOG_IF(severity, condition) \
(true || !(condition)) ? (void) 0 : google::LogMessageVoidify() & LOG(severity)
#define DLOG_EVERY_N(severity, n) \
true ? (void) 0 : google::LogMessageVoidify() & LOG(severity)
#define DLOG_IF_EVERY_N(severity, condition, n) \
(true || !(condition))? (void) 0 : google::LogMessageVoidify() & LOG(severity)
#define DLOG_ASSERT(condition) \
true ? (void) 0 : LOG_ASSERT(condition)
// MSVC warning C4127: conditional expression is constant
#define DCHECK(condition) \
GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
while (false) \
GLOG_MSVC_POP_WARNING() CHECK(condition)
#define DCHECK_EQ(val1, val2) \
GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
while (false) \
GLOG_MSVC_POP_WARNING() CHECK_EQ(val1, val2)
#define DCHECK_NE(val1, val2) \
GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
while (false) \
GLOG_MSVC_POP_WARNING() CHECK_NE(val1, val2)
#define DCHECK_LE(val1, val2) \
GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
while (false) \
GLOG_MSVC_POP_WARNING() CHECK_LE(val1, val2)
#define DCHECK_LT(val1, val2) \
GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
while (false) \
GLOG_MSVC_POP_WARNING() CHECK_LT(val1, val2)
#define DCHECK_GE(val1, val2) \
GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
while (false) \
GLOG_MSVC_POP_WARNING() CHECK_GE(val1, val2)
#define DCHECK_GT(val1, val2) \
GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
while (false) \
GLOG_MSVC_POP_WARNING() CHECK_GT(val1, val2)
// You may see warnings in release mode if you don't use the return
// value of DCHECK_NOTNULL. Please just use DCHECK for such cases.
#define DCHECK_NOTNULL(val) (val)
#define DCHECK_STREQ(str1, str2) \
GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
while (false) \
GLOG_MSVC_POP_WARNING() CHECK_STREQ(str1, str2)
#define DCHECK_STRCASEEQ(str1, str2) \
GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
while (false) \
GLOG_MSVC_POP_WARNING() CHECK_STRCASEEQ(str1, str2)
#define DCHECK_STRNE(str1, str2) \
GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
while (false) \
GLOG_MSVC_POP_WARNING() CHECK_STRNE(str1, str2)
#define DCHECK_STRCASENE(str1, str2) \
GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
while (false) \
GLOG_MSVC_POP_WARNING() CHECK_STRCASENE(str1, str2)
#endif // DCHECK_IS_ON()
// Log only in verbose mode.
#define VLOG(verboselevel) LOG_IF(INFO, VLOG_IS_ON(verboselevel))
#define VLOG_IF(verboselevel, condition) \
LOG_IF(INFO, (condition) && VLOG_IS_ON(verboselevel))
#define VLOG_EVERY_N(verboselevel, n) \
LOG_IF_EVERY_N(INFO, VLOG_IS_ON(verboselevel), n)
#define VLOG_IF_EVERY_N(verboselevel, condition, n) \
LOG_IF_EVERY_N(INFO, (condition) && VLOG_IS_ON(verboselevel), n)
namespace base_logging {
// LogMessage::LogStream is a std::ostream backed by this streambuf.
// This class ignores overflow and leaves two bytes at the end of the
// buffer to allow for a '\n' and '\0'.
class GOOGLE_GLOG_DLL_DECL LogStreamBuf : public std::streambuf {
public:
// REQUIREMENTS: "len" must be >= 2 to account for the '\n' and '\n'.
LogStreamBuf(char *buf, int len) {
setp(buf, buf + len - 2);
}
// This effectively ignores overflow.
virtual int_type overflow(int_type ch) {
return ch;
}
// Legacy public ostrstream method.
size_t pcount() const { return pptr() - pbase(); }
char* pbase() const { return std::streambuf::pbase(); }
};
} // namespace base_logging
//
// This class more or less represents a particular log message. You
// create an instance of LogMessage and then stream stuff to it.
// When you finish streaming to it, ~LogMessage is called and the
// full message gets streamed to the appropriate destination.
//
// You shouldn't actually use LogMessage's constructor to log things,
// though. You should use the LOG() macro (and variants thereof)
// above.
class GOOGLE_GLOG_DLL_DECL LogMessage {
public:
enum {
// Passing kNoLogPrefix for the line number disables the
// log-message prefix. Useful for using the LogMessage
// infrastructure as a printing utility. See also the --log_prefix
// flag for controlling the log-message prefix on an
// application-wide basis.
kNoLogPrefix = -1
};
// LogStream inherit from non-DLL-exported class (std::ostrstream)
// and VC++ produces a warning for this situation.
// However, MSDN says "C4275 can be ignored in Microsoft Visual C++
// 2005 if you are deriving from a type in the Standard C++ Library"
// http://msdn.microsoft.com/en-us/library/3tdb471s(VS.80).aspx
// Let's just ignore the warning.
#ifdef _MSC_VER
# pragma warning(disable: 4275)
#endif
class GOOGLE_GLOG_DLL_DECL LogStream : public std::ostream {
#ifdef _MSC_VER
# pragma warning(default: 4275)
#endif
public:
LogStream(char *buf, int len, int ctr)
: std::ostream(NULL),
streambuf_(buf, len),
ctr_(ctr),
self_(this) {
rdbuf(&streambuf_);
}
int ctr() const { return ctr_; }
void set_ctr(int ctr) { ctr_ = ctr; }
LogStream* self() const { return self_; }
// Legacy std::streambuf methods.
size_t pcount() const { return streambuf_.pcount(); }
char* pbase() const { return streambuf_.pbase(); }
char* str() const { return pbase(); }
private:
LogStream(const LogStream&);
LogStream& operator=(const LogStream&);
base_logging::LogStreamBuf streambuf_;
int ctr_; // Counter hack (for the LOG_EVERY_X() macro)
LogStream *self_; // Consistency check hack
};
public:
// icc 8 requires this typedef to avoid an internal compiler error.
typedef void (LogMessage::*SendMethod)();
LogMessage(const char* file, int line, LogSeverity severity, int ctr,
SendMethod send_method);
// Two special constructors that generate reduced amounts of code at
// LOG call sites for common cases.
// Used for LOG(INFO): Implied are:
// severity = INFO, ctr = 0, send_method = &LogMessage::SendToLog.
//
// Using this constructor instead of the more complex constructor above
// saves 19 bytes per call site.
LogMessage(const char* file, int line);
// Used for LOG(severity) where severity != INFO. Implied
// are: ctr = 0, send_method = &LogMessage::SendToLog
//
// Using this constructor instead of the more complex constructor above
// saves 17 bytes per call site.
LogMessage(const char* file, int line, LogSeverity severity);
// Constructor to log this message to a specified sink (if not NULL).
// Implied are: ctr = 0, send_method = &LogMessage::SendToSinkAndLog if
// also_send_to_log is true, send_method = &LogMessage::SendToSink otherwise.
LogMessage(const char* file, int line, LogSeverity severity, LogSink* sink,
bool also_send_to_log);
// Constructor where we also give a vector<string> pointer
// for storing the messages (if the pointer is not NULL).
// Implied are: ctr = 0, send_method = &LogMessage::SaveOrSendToLog.
LogMessage(const char* file, int line, LogSeverity severity,
std::vector<std::string>* outvec);
// Constructor where we also give a string pointer for storing the
// message (if the pointer is not NULL). Implied are: ctr = 0,
// send_method = &LogMessage::WriteToStringAndLog.
LogMessage(const char* file, int line, LogSeverity severity,
std::string* message);
// A special constructor used for check failures
LogMessage(const char* file, int line, const CheckOpString& result);
~LogMessage();
// Flush a buffered message to the sink set in the constructor. Always
// called by the destructor, it may also be called from elsewhere if
// needed. Only the first call is actioned; any later ones are ignored.
void Flush();
// An arbitrary limit on the length of a single log message. This
// is so that streaming can be done more efficiently.
static const size_t kMaxLogMessageLen;
// Theses should not be called directly outside of logging.*,
// only passed as SendMethod arguments to other LogMessage methods:
void SendToLog(); // Actually dispatch to the logs
void SendToSyslogAndLog(); // Actually dispatch to syslog and the logs
// Call abort() or similar to perform LOG(FATAL) crash.
static void __attribute__ ((noreturn)) Fail();
std::ostream& stream();
int preserved_errno() const;
// Must be called without the log_mutex held. (L < log_mutex)
static int64 num_messages(int severity);
struct LogMessageData;
private:
// Fully internal SendMethod cases:
void SendToSinkAndLog(); // Send to sink if provided and dispatch to the logs
void SendToSink(); // Send to sink if provided, do nothing otherwise.
// Write to string if provided and dispatch to the logs.
void WriteToStringAndLog();
void SaveOrSendToLog(); // Save to stringvec if provided, else to logs
void Init(const char* file, int line, LogSeverity severity,
void (LogMessage::*send_method)());
// Used to fill in crash information during LOG(FATAL) failures.
void RecordCrashReason(glog_internal_namespace_::CrashReason* reason);
// Counts of messages sent at each priority:
static int64 num_messages_[NUM_SEVERITIES]; // under log_mutex
// We keep the data in a separate struct so that each instance of
// LogMessage uses less stack space.
LogMessageData* allocated_;
LogMessageData* data_;
friend class LogDestination;
LogMessage(const LogMessage&);
void operator=(const LogMessage&);
};
// This class happens to be thread-hostile because all instances share
// a single data buffer, but since it can only be created just before
// the process dies, we don't worry so much.
class GOOGLE_GLOG_DLL_DECL LogMessageFatal : public LogMessage {
public:
LogMessageFatal(const char* file, int line);
LogMessageFatal(const char* file, int line, const CheckOpString& result);
__attribute__ ((noreturn)) ~LogMessageFatal();
};
// A non-macro interface to the log facility; (useful
// when the logging level is not a compile-time constant).
inline void LogAtLevel(int const severity, std::string const &msg) {
LogMessage(__FILE__, __LINE__, severity).stream() << msg;
}
// A macro alternative of LogAtLevel. New code may want to use this
// version since there are two advantages: 1. this version outputs the
// file name and the line number where this macro is put like other
// LOG macros, 2. this macro can be used as C++ stream.
#define LOG_AT_LEVEL(severity) google::LogMessage(__FILE__, __LINE__, severity).stream()
// Check if it's compiled in C++11 mode.
//
// GXX_EXPERIMENTAL_CXX0X is defined by gcc and clang up to at least
// gcc-4.7 and clang-3.1 (2011-12-13). __cplusplus was defined to 1
// in gcc before 4.7 (Crosstool 16) and clang before 3.1, but is
// defined according to the language version in effect thereafter.
// Microsoft Visual Studio 14 (2015) sets __cplusplus==199711 despite
// reasonably good C++11 support, so we set LANG_CXX for it and
// newer versions (_MSC_VER >= 1900).
#if (defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L || \
(defined(_MSC_VER) && _MSC_VER >= 1900))
// Helper for CHECK_NOTNULL().
//
// In C++11, all cases can be handled by a single function. Since the value
// category of the argument is preserved (also for rvalue references),
// member initializer lists like the one below will compile correctly:
//
// Foo()
// : x_(CHECK_NOTNULL(MethodReturningUniquePtr())) {}
template <typename T>
T CheckNotNull(const char* file, int line, const char* names, T&& t) {
if (t == nullptr) {
LogMessageFatal(file, line, new std::string(names));
}
return std::forward<T>(t);
}
#else
// A small helper for CHECK_NOTNULL().
template <typename T>
T* CheckNotNull(const char *file, int line, const char *names, T* t) {
if (t == NULL) {
LogMessageFatal(file, line, new std::string(names));
}
return t;
}
#endif
// Allow folks to put a counter in the LOG_EVERY_X()'ed messages. This
// only works if ostream is a LogStream. If the ostream is not a
// LogStream you'll get an assert saying as much at runtime.
GOOGLE_GLOG_DLL_DECL std::ostream& operator<<(std::ostream &os,
const PRIVATE_Counter&);
// Derived class for PLOG*() above.
class GOOGLE_GLOG_DLL_DECL ErrnoLogMessage : public LogMessage {
public:
ErrnoLogMessage(const char* file, int line, LogSeverity severity, int ctr,
void (LogMessage::*send_method)());
// Postpends ": strerror(errno) [errno]".
~ErrnoLogMessage();
private:
ErrnoLogMessage(const ErrnoLogMessage&);
void operator=(const ErrnoLogMessage&);
};
// This class is used to explicitly ignore values in the conditional
// logging macros. This avoids compiler warnings like "value computed
// is not used" and "statement has no effect".
class GOOGLE_GLOG_DLL_DECL LogMessageVoidify {
public:
LogMessageVoidify() { }
// This has to be an operator with a precedence lower than << but
// higher than ?:
void operator&(std::ostream&) { }
};
// Flushes all log files that contains messages that are at least of
// the specified severity level. Thread-safe.
GOOGLE_GLOG_DLL_DECL void FlushLogFiles(LogSeverity min_severity);
// Flushes all log files that contains messages that are at least of
// the specified severity level. Thread-hostile because it ignores
// locking -- used for catastrophic failures.
GOOGLE_GLOG_DLL_DECL void FlushLogFilesUnsafe(LogSeverity min_severity);
//
// Set the destination to which a particular severity level of log
// messages is sent. If base_filename is "", it means "don't log this
// severity". Thread-safe.
//
GOOGLE_GLOG_DLL_DECL void SetLogDestination(LogSeverity severity,
const char* base_filename);
//
// Set the basename of the symlink to the latest log file at a given
// severity. If symlink_basename is empty, do not make a symlink. If
// you don't call this function, the symlink basename is the
// invocation name of the program. Thread-safe.
//
GOOGLE_GLOG_DLL_DECL void SetLogSymlink(LogSeverity severity,
const char* symlink_basename);
//
// Used to send logs to some other kind of destination
// Users should subclass LogSink and override send to do whatever they want.
// Implementations must be thread-safe because a shared instance will
// be called from whichever thread ran the LOG(XXX) line.
class GOOGLE_GLOG_DLL_DECL LogSink {
public:
virtual ~LogSink();
// Sink's logging logic (message_len is such as to exclude '\n' at the end).
// This method can't use LOG() or CHECK() as logging system mutex(s) are held
// during this call.
virtual void send(LogSeverity severity, const char* full_filename,
const char* base_filename, int line,
const struct ::tm* tm_time,
const char* message, size_t message_len) = 0;
// Redefine this to implement waiting for
// the sink's logging logic to complete.
// It will be called after each send() returns,
// but before that LogMessage exits or crashes.
// By default this function does nothing.
// Using this function one can implement complex logic for send()
// that itself involves logging; and do all this w/o causing deadlocks and
// inconsistent rearrangement of log messages.
// E.g. if a LogSink has thread-specific actions, the send() method
// can simply add the message to a queue and wake up another thread that
// handles real logging while itself making some LOG() calls;
// WaitTillSent() can be implemented to wait for that logic to complete.
// See our unittest for an example.
virtual void WaitTillSent();
// Returns the normal text output of the log message.
// Can be useful to implement send().
static std::string ToString(LogSeverity severity, const char* file, int line,
const struct ::tm* tm_time,
const char* message, size_t message_len);
};
// Add or remove a LogSink as a consumer of logging data. Thread-safe.
GOOGLE_GLOG_DLL_DECL void AddLogSink(LogSink *destination);
GOOGLE_GLOG_DLL_DECL void RemoveLogSink(LogSink *destination);
//
// Specify an "extension" added to the filename specified via
// SetLogDestination. This applies to all severity levels. It's
// often used to append the port we're listening on to the logfile
// name. Thread-safe.
//
GOOGLE_GLOG_DLL_DECL void SetLogFilenameExtension(
const char* filename_extension);
//
// Make it so that all log messages of at least a particular severity
// are logged to stderr (in addition to logging to the usual log
// file(s)). Thread-safe.
//
GOOGLE_GLOG_DLL_DECL void SetStderrLogging(LogSeverity min_severity);
//
// Make it so that all log messages go only to stderr. Thread-safe.
//
GOOGLE_GLOG_DLL_DECL void LogToStderr();
//
// Make it so that all log messages of at least a particular severity are
// logged via email to a list of addresses (in addition to logging to the
// usual log file(s)). The list of addresses is just a string containing
// the email addresses to send to (separated by spaces, say). Thread-safe.
//
GOOGLE_GLOG_DLL_DECL void SetEmailLogging(LogSeverity min_severity,
const char* addresses);
// A simple function that sends email. dest is a commma-separated
// list of addressess. Thread-safe.
GOOGLE_GLOG_DLL_DECL bool SendEmail(const char *dest,
const char *subject, const char *body);
GOOGLE_GLOG_DLL_DECL const std::vector<std::string>& GetLoggingDirectories();
// For tests only: Clear the internal [cached] list of logging directories to
// force a refresh the next time GetLoggingDirectories is called.
// Thread-hostile.
void TestOnly_ClearLoggingDirectoriesList();
// Returns a set of existing temporary directories, which will be a
// subset of the directories returned by GetLogginDirectories().
// Thread-safe.
GOOGLE_GLOG_DLL_DECL void GetExistingTempDirectories(
std::vector<std::string>* list);
// Print any fatal message again -- useful to call from signal handler
// so that the last thing in the output is the fatal message.
// Thread-hostile, but a race is unlikely.
GOOGLE_GLOG_DLL_DECL void ReprintFatalMessage();
// Truncate a log file that may be the append-only output of multiple
// processes and hence can't simply be renamed/reopened (typically a
// stdout/stderr). If the file "path" is > "limit" bytes, copy the
// last "keep" bytes to offset 0 and truncate the rest. Since we could
// be racing with other writers, this approach has the potential to
// lose very small amounts of data. For security, only follow symlinks
// if the path is /proc/self/fd/*
GOOGLE_GLOG_DLL_DECL void TruncateLogFile(const char *path,
int64 limit, int64 keep);
// Truncate stdout and stderr if they are over the value specified by
// --max_log_size; keep the final 1MB. This function has the same
// race condition as TruncateLogFile.
GOOGLE_GLOG_DLL_DECL void TruncateStdoutStderr();
// Return the string representation of the provided LogSeverity level.
// Thread-safe.
GOOGLE_GLOG_DLL_DECL const char* GetLogSeverityName(LogSeverity severity);
// ---------------------------------------------------------------------
// Implementation details that are not useful to most clients
// ---------------------------------------------------------------------
// A Logger is the interface used by logging modules to emit entries
// to a log. A typical implementation will dump formatted data to a
// sequence of files. We also provide interfaces that will forward
// the data to another thread so that the invoker never blocks.
// Implementations should be thread-safe since the logging system
// will write to them from multiple threads.
namespace base {
class GOOGLE_GLOG_DLL_DECL Logger {
public:
virtual ~Logger();
// Writes "message[0,message_len-1]" corresponding to an event that
// occurred at "timestamp". If "force_flush" is true, the log file
// is flushed immediately.
//
// The input message has already been formatted as deemed
// appropriate by the higher level logging facility. For example,
// textual log messages already contain timestamps, and the
// file:linenumber header.
virtual void Write(bool force_flush,
time_t timestamp,
const char* message,
int message_len) = 0;
// Flush any buffered messages
virtual void Flush() = 0;
// Get the current LOG file size.
// The returned value is approximate since some
// logged data may not have been flushed to disk yet.
virtual uint32 LogSize() = 0;
};
// Get the logger for the specified severity level. The logger
// remains the property of the logging module and should not be
// deleted by the caller. Thread-safe.
extern GOOGLE_GLOG_DLL_DECL Logger* GetLogger(LogSeverity level);
// Set the logger for the specified severity level. The logger
// becomes the property of the logging module and should not
// be deleted by the caller. Thread-safe.
extern GOOGLE_GLOG_DLL_DECL void SetLogger(LogSeverity level, Logger* logger);
}
// glibc has traditionally implemented two incompatible versions of
// strerror_r(). There is a poorly defined convention for picking the
// version that we want, but it is not clear whether it even works with
// all versions of glibc.
// So, instead, we provide this wrapper that automatically detects the
// version that is in use, and then implements POSIX semantics.
// N.B. In addition to what POSIX says, we also guarantee that "buf" will
// be set to an empty string, if this function failed. This means, in most
// cases, you do not need to check the error code and you can directly
// use the value of "buf". It will never have an undefined value.
// DEPRECATED: Use StrError(int) instead.
GOOGLE_GLOG_DLL_DECL int posix_strerror_r(int err, char *buf, size_t len);
// A thread-safe replacement for strerror(). Returns a string describing the
// given POSIX error code.
GOOGLE_GLOG_DLL_DECL std::string StrError(int err);
// A class for which we define operator<<, which does nothing.
class GOOGLE_GLOG_DLL_DECL NullStream : public LogMessage::LogStream {
public:
// Initialize the LogStream so the messages can be written somewhere
// (they'll never be actually displayed). This will be needed if a
// NullStream& is implicitly converted to LogStream&, in which case
// the overloaded NullStream::operator<< will not be invoked.
NullStream() : LogMessage::LogStream(message_buffer_, 1, 0) { }
NullStream(const char* /*file*/, int /*line*/,
const CheckOpString& /*result*/) :
LogMessage::LogStream(message_buffer_, 1, 0) { }
NullStream &stream() { return *this; }
private:
// A very short buffer for messages (which we discard anyway). This
// will be needed if NullStream& converted to LogStream& (e.g. as a
// result of a conditional expression).
char message_buffer_[2];
};
// Do nothing. This operator is inline, allowing the message to be
// compiled away. The message will not be compiled away if we do
// something like (flag ? LOG(INFO) : LOG(ERROR)) << message; when
// SKIP_LOG=WARNING. In those cases, NullStream will be implicitly
// converted to LogStream and the message will be computed and then
// quietly discarded.
template<class T>
inline NullStream& operator<<(NullStream &str, const T &) { return str; }
// Similar to NullStream, but aborts the program (without stack
// trace), like LogMessageFatal.
class GOOGLE_GLOG_DLL_DECL NullStreamFatal : public NullStream {
public:
NullStreamFatal() { }
NullStreamFatal(const char* file, int line, const CheckOpString& result) :
NullStream(file, line, result) { }
__attribute__ ((noreturn)) ~NullStreamFatal() throw () { _exit(1); }
};
// Install a signal handler that will dump signal information and a stack
// trace when the program crashes on certain signals. We'll install the
// signal handler for the following signals.
//
// SIGSEGV, SIGILL, SIGFPE, SIGABRT, SIGBUS, and SIGTERM.
//
// By default, the signal handler will write the failure dump to the
// standard error. You can customize the destination by installing your
// own writer function by InstallFailureWriter() below.
//
// Note on threading:
//
// The function should be called before threads are created, if you want
// to use the failure signal handler for all threads. The stack trace
// will be shown only for the thread that receives the signal. In other
// words, stack traces of other threads won't be shown.
GOOGLE_GLOG_DLL_DECL void InstallFailureSignalHandler();
// Installs a function that is used for writing the failure dump. "data"
// is the pointer to the beginning of a message to be written, and "size"
// is the size of the message. You should not expect the data is
// terminated with '\0'.
GOOGLE_GLOG_DLL_DECL void InstallFailureWriter(
void (*writer)(const char* data, int size));
}
#endif // _LOGGING_H_
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