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Copy pathlogging.h
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119 lines (99 loc) · 3.44 KB
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// Copyright 2018 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 CC_LOGGING_H_
#define CC_LOGGING_H_
#include <sstream>
#include "absl/base/attributes.h"
#include "absl/base/optimization.h"
namespace minigo {
namespace internal {
enum class LogLevel {
INFO,
WARNING,
ERROR,
FATAL,
};
// A simple thread-safe logging stream that replaces logging directly to
// stderr, which is not thread-safe.
// All logging is written to stderr.
// For log levels other than INFO, the line is prefixed with the log level and
// source code location of the message.
class LogStream {
public:
LogStream(const char* file, int line, LogLevel level);
~LogStream();
template <typename T>
LogStream& operator<<(const T& t) {
stream_ << t;
return *this;
}
private:
std::stringstream stream_;
LogLevel level_;
};
void ABSL_ATTRIBUTE_NOINLINE CheckFail(const char* cond, const char* file,
int line);
// CheckFailStream is used by the MG_CHECK macro to log a FATAL error when a
// condition fails.
class CheckFailStream {
public:
CheckFailStream(const char* cond, const char* file, int line);
template <typename T>
CheckFailStream& operator<<(const T& t) {
impl_ << t;
return *this;
}
operator bool() { return true; }
private:
LogStream impl_;
};
// CheckNoOpStream is used in non-debug builds (i.e. when NDEBUG defined) that
// allows the compiler to completely optimize away MG_DCHECK macros.
class CheckNoOpStream {
public:
template <typename T>
CheckNoOpStream& operator<<(const T& t) {
return *this;
}
operator bool() { return true; }
};
// CheckStreamVoidify is used in the MG_CHECK macro to convert the result of
// CheckFailStream logging to void. The & operator is used because it has a
// precedence lower than << but higher than ?:
class CheckStreamVoidify {
public:
void operator&(const CheckFailStream&) {}
void operator&(const CheckNoOpStream&) {}
};
} // namespace internal
} // namespace minigo
#define MG_LOG(level) \
::minigo::internal::LogStream(__FILE__, __LINE__, \
::minigo::internal::LogLevel::level)
// MG_CHECK(cond) and MG_DCHECK(cond) halt the program, printing the current
// the given condition `cond` is not true. MG_CHECK is always enabled, MG_DCHECK
// is only enabled for debug builds (i.e. when NDEBUG is not defined).
// Both result expressions of the ?: ternary operator evaluate to void, which
// silences "statement has no effect" compiler warnings.
#define MG_CHECK(cond) \
(cond) ? (void)0 \
: ::minigo::internal::CheckStreamVoidify() & \
::minigo::internal::CheckFailStream(#cond, __FILE__, __LINE__)
#ifndef NDEBUG
#define MG_DCHECK(cond) MG_CHECK(cond)
#else
#define MG_DCHECK(cond) \
while (false && (cond)) ::minigo::internal::CheckNoOpStream()
#endif
#endif // CC_LOGGING_H_