blob: ec460fb45df736c4e0cee1cac28c3dd1728ba988 [file] [log] [blame]
// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Logging macros, similar to Chromium's base/logging.h, except with |MOJO_|
// prefixes and missing some features (notably |CHECK_EQ()|, etc.).
// TODO(vtl): It's weird that this is in the environment directory, since its
// implementation (in environment/lib) is meant to be used by any implementation
// of the environment.
#ifndef MOJO_PUBLIC_CPP_ENVIRONMENT_LOGGING_H_
#define MOJO_PUBLIC_CPP_ENVIRONMENT_LOGGING_H_
#include <mojo/environment/logger.h>
#include <sstream>
#include "mojo/public/cpp/environment/environment.h"
#include "mojo/public/cpp/system/macros.h"
#define MOJO_LOG_STREAM(level) \
::mojo::internal::LogMessage(MOJO_LOG_LEVEL_##level, __FILE__, __LINE__) \
.stream()
#define MOJO_LAZY_LOG_STREAM(level, condition) \
!(condition) ? (void)0 \
: ::mojo::internal::VoidifyOstream() & MOJO_LOG_STREAM(level)
#define MOJO_SHOULD_LOG(level) \
(MOJO_LOG_LEVEL_##level >= \
::mojo::Environment::GetDefaultLogger()->GetMinimumLogLevel())
#define MOJO_LOG(level) MOJO_LAZY_LOG_STREAM(level, MOJO_SHOULD_LOG(level))
#define MOJO_LOG_IF(level, condition) \
MOJO_LAZY_LOG_STREAM(level, MOJO_SHOULD_LOG(level) && (condition))
#define MOJO_CHECK(condition) \
MOJO_LAZY_LOG_STREAM(FATAL, !(condition)) << "Check failed: " #condition "." \
" "
// Note: For non-debug builds, |MOJO_DLOG_IF()| *eliminates* (i.e., doesn't
// compile) the condition, whereas |MOJO_DCHECK()| "neuters" the condition
// (i.e., compiles, but doesn't evaluate).
#ifdef NDEBUG
#define MOJO_DLOG(level) MOJO_LAZY_LOG_STREAM(level, false)
#define MOJO_DLOG_IF(level, condition) MOJO_LAZY_LOG_STREAM(level, false)
#else
#define MOJO_DLOG(level) MOJO_LOG(level)
#define MOJO_DLOG_IF(level, condition) MOJO_LOG_IF(level, condition)
#endif // NDEBUG
#if defined(NDEBUG) && !defined(DCHECK_ALWAYS_ON)
#define MOJO_DCHECK(condition) \
MOJO_LAZY_LOG_STREAM(FATAL, false ? !(condition) : false)
#else
#define MOJO_DCHECK(condition) MOJO_CHECK(condition)
#endif // NDEBUG && !defined(DCHECK_ALWAYS_ON)
namespace mojo {
namespace internal {
class LogMessage {
public:
LogMessage(MojoLogLevel log_level, const char* file, int line);
~LogMessage();
std::ostream& stream() { return stream_; }
private:
const MojoLogLevel log_level_;
const char* const file_;
const int line_;
std::ostringstream stream_;
MOJO_DISALLOW_COPY_AND_ASSIGN(LogMessage);
};
// Used to ignore a stream.
struct VoidifyOstream {
// Use & since it has precedence lower than << but higher than ?:.
void operator&(std::ostream&) {}
};
} // namespace internal
} // namespace mojo
#endif // MOJO_PUBLIC_CPP_ENVIRONMENT_LOGGING_H_