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https://git.libcamera.org/libcamera/libcamera.git
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aca8457d34
Use move construction to essentially pass through the string returned by `Loggable::logPrefix()` to avoid an unnecessary copy. Signed-off-by: Barnabás Pőcze <pobrn@protonmail.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
135 lines
3.4 KiB
C++
135 lines
3.4 KiB
C++
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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/*
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* Copyright (C) 2018, Google Inc.
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*
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* Logging infrastructure
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*/
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#pragma once
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#include <atomic>
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#include <sstream>
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#include <string_view>
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#include <libcamera/base/private.h>
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#include <libcamera/base/class.h>
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#include <libcamera/base/utils.h>
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namespace libcamera {
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enum LogSeverity {
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LogInvalid = -1,
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LogDebug = 0,
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LogInfo,
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LogWarning,
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LogError,
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LogFatal,
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};
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class LogCategory
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{
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public:
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static LogCategory *create(std::string_view name);
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const std::string &name() const { return name_; }
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LogSeverity severity() const { return severity_.load(std::memory_order_relaxed); }
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void setSeverity(LogSeverity severity) { severity_.store(severity, std::memory_order_relaxed); }
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static const LogCategory &defaultCategory();
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private:
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explicit LogCategory(std::string_view name);
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const std::string name_;
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std::atomic<LogSeverity> severity_;
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static_assert(decltype(severity_)::is_always_lock_free);
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};
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#define LOG_DECLARE_CATEGORY(name) \
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extern const LogCategory &_LOG_CATEGORY(name)();
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#define LOG_DEFINE_CATEGORY(name) \
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LOG_DECLARE_CATEGORY(name) \
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const LogCategory &_LOG_CATEGORY(name)() \
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{ \
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/* The instance will be deleted by the Logger destructor. */ \
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static LogCategory *category = LogCategory::create(#name); \
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return *category; \
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}
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class LogMessage
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{
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public:
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LogMessage(const char *fileName, unsigned int line,
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const LogCategory &category, LogSeverity severity,
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std::string prefix = {});
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~LogMessage();
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std::ostream &stream() { return msgStream_; }
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const utils::time_point ×tamp() const { return timestamp_; }
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LogSeverity severity() const { return severity_; }
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const LogCategory &category() const { return category_; }
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const std::string &fileInfo() const { return fileInfo_; }
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const std::string &prefix() const { return prefix_; }
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const std::string msg() const { return msgStream_.str(); }
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private:
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LIBCAMERA_DISABLE_COPY_AND_MOVE(LogMessage)
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std::ostringstream msgStream_;
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const LogCategory &category_;
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LogSeverity severity_;
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utils::time_point timestamp_;
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std::string fileInfo_;
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std::string prefix_;
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};
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class Loggable
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{
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public:
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virtual ~Loggable();
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protected:
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virtual std::string logPrefix() const = 0;
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LogMessage _log(const LogCategory *category, LogSeverity severity,
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const char *fileName = __builtin_FILE(),
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unsigned int line = __builtin_LINE()) const;
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};
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LogMessage _log(const LogCategory *category, LogSeverity severity,
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const char *fileName = __builtin_FILE(),
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unsigned int line = __builtin_LINE());
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#ifndef __DOXYGEN__
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#define _LOG_CATEGORY(name) logCategory##name
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#define _LOG1(severity) \
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_log(nullptr, Log##severity).stream()
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#define _LOG2(category, severity) \
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_log(&_LOG_CATEGORY(category)(), Log##severity).stream()
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/*
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* Expand the LOG() macro to _LOG1() or _LOG2() based on the number of
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* arguments.
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*/
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#define _LOG_MACRO(_1, _2, NAME, ...) NAME
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#define LOG(...) _LOG_MACRO(__VA_ARGS__, _LOG2, _LOG1)(__VA_ARGS__)
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#else /* __DOXYGEN___ */
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#define LOG(category, severity)
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#endif /* __DOXYGEN__ */
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#ifndef NDEBUG
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#define ASSERT(condition) static_cast<void>(({ \
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if (!(condition)) \
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LOG(Fatal) << "assertion \"" #condition "\" failed in " \
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<< __func__ << "()"; \
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}))
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#else
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#define ASSERT(condition) static_cast<void>(false && (condition))
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#endif
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} /* namespace libcamera */
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