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log.h
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log.h
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// Copyright 2010-2022 Google LLC
// 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
//
// http://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.
#ifndef OR_TOOLS_BASE_LOG_H_
#define OR_TOOLS_BASE_LOG_H_
#include <errno.h>
#include <string.h>
#include <time.h>
#include <cassert>
#include <cstddef>
#include <iosfwd>
#include <ostream>
#include <sstream>
#include <string>
#if defined(__GNUC__) && defined(__linux__)
#include <unistd.h>
#endif
#include <vector>
#include "ortools/base/flags.h"
#include "ortools/base/integral_types.h"
#include "ortools/base/log_severity.h"
#include "ortools/base/logging_export.h"
#include "ortools/base/macros.h"
#include "ortools/base/vlog_is_on.h"
#define QCHECK CHECK
#define QCHECK_EQ CHECK_EQ
#define QCHECK_GE CHECK_GE
#define QCHECK_GT CHECK_GT
#define ABSL_DIE_IF_NULL CHECK_NOTNULL
#define CHECK_OK(x) CHECK((x).ok())
#define QCHECK_OK CHECK_OK
// used by or-tools non C++ ports to bridge with the C++ layer.
void FixFlagsAndEnvironmentForSwig();
#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))
#define ATTRIBUTE_NOINLINE
#define ATTRIBUTE_NORETURN __declspec(noreturn)
#else
#define GLOG_MSVC_PUSH_DISABLE_WARNING(n)
#define GLOG_MSVC_POP_WARNING()
#define ATTRIBUTE_NOINLINE __attribute__((noinline))
#define ATTRIBUTE_NORETURN __attribute__((noreturn))
#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 !defined(_MSC_VER)
#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 !defined(_MSC_VER)
#define GOOGLE_PREDICT_FALSE(x) (__builtin_expect(x, 0))
#else
#define GOOGLE_PREDICT_FALSE(x) x
#endif
#endif
#ifndef GOOGLE_PREDICT_TRUE
#if !defined(_MSC_VER)
#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 is also a VLOG_EVERY_N "verbose level"
// condition macros for sample cases, when some extra computation and
// preparation for logs is not needed.
// VLOG_EVERY_N(1, 10)
// << "I'm printed every 10th occurrence, and when you run the program "
// "with --v=1 or more. Present occurrence 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.
// 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
#define COMPACT_GOOGLE_LOG_QFATAL COMPACT_GOOGLE_LOG_FATAL
#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 = nullptr; \
LPSTR msg = reinterpret_cast<LPSTR>(&message); \
DWORD message_length = FormatMessageA( \
FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM, 0, \
result, 0, msg, 100, nullptr); \
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 {
// 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 pointer 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 pointer 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 pointer arguments.
#define LOG_STRING(severity, outvec) \
LOG_TO_STRING_##severity(static_cast<std::vector<std::string>*>(outvec)) \
.stream()
#define LOG_IF(severity, condition) \
static_cast<void>(0), \
!(condition) ? (void)0 : google::LogMessageVoidify() & LOG(severity)
#define SYSLOG_IF(severity, condition) \
static_cast<void>(0), \
!(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_ != nullptr);
}
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 int16_t GetReferenceableValue(int16_t t) { return t; }
inline uint16_t GetReferenceableValue(uint16_t t) { return t; }
inline int GetReferenceableValue(int t) { return t; }
inline unsigned int GetReferenceableValue(unsigned int t) { return t; }
inline int64_t GetReferenceableValue(int64_t t) { return t; }
inline uint64_t GetReferenceableValue(uint64_t t) { return t; }
// This is a dummy class to define the following operator.
struct DummyClassToDefineOperator {};
} // namespace google
// 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;
// Provide printable value for std::nullptr_t
template <>
GOOGLE_GLOG_DLL_DECL void MakeCheckOpValueString(std::ostream* os,
const std::nullptr_t& v);
namespace base {
namespace internal {
// If "s" is less than INFO, returns INFO.
// If "s" is greater than FATAL, returns
// 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 nullptr; \
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(nullptr, x)?
DEFINE_CHECK_OP_IMPL(Check_NE, !=) // Use CHECK(x == nullptr) 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 statements 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) \
static_cast<void>(0), \
!(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 logging_internal {
template <bool>
struct CompileAssert {};
struct CrashReason;
} // namespace logging_internal
#define LOG_EVERY_N(severity, n) \
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 _MSC_VER
// 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;
#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) \
static_cast<void>(0), \
true ? (void)0 : google::LogMessageVoidify() & LOG(severity)
#define DVLOG(verboselevel) \
static_cast<void>(0), (true || !VLOG_IS_ON(verboselevel)) \
? (void)0 \
: google::LogMessageVoidify() & LOG(INFO)
#define DLOG_IF(severity, condition) \
static_cast<void>(0), (true || !(condition)) \
? (void)0 \
: google::LogMessageVoidify() & LOG(severity)
#define DLOG_EVERY_N(severity, n) \
static_cast<void>(0), \
true ? (void)0 : google::LogMessageVoidify() & LOG(severity)
#define DLOG_IF_EVERY_N(severity, condition, n) \
static_cast<void>(0), (true || !(condition)) \
? (void)0 \
: google::LogMessageVoidify() & LOG(severity)
#define DLOG_ASSERT(condition) \
static_cast<void>(0), 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_EVERY_N(verboselevel, n) \
LOG_IF_EVERY_N(INFO, 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 '\0'.
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.
GLOG_MSVC_PUSH_DISABLE_WARNING(4275)
class GOOGLE_GLOG_DLL_DECL LogStream : public std::ostream {
GLOG_MSVC_POP_WARNING()
public:
LogStream(char* buf, int len, int ctr)
: std::ostream(nullptr), 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_; }