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476b46954c
These should be entirely non-breaking, i.e. 1:1 and same backing `int` value. (See https://github.com/flutter/engine/pull/46052)
116 lines
3.3 KiB
C++
116 lines
3.3 KiB
C++
// Copyright 2013 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef FLUTTER_FML_LOGGING_H_
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#define FLUTTER_FML_LOGGING_H_
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#include <sstream>
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#include "flutter/fml/log_level.h"
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#include "flutter/fml/macros.h"
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namespace fml {
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namespace testing {
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struct LogCapture {
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LogCapture();
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~LogCapture();
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std::string str() const;
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private:
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std::ostringstream stream_;
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};
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} // namespace testing
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class LogMessageVoidify {
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public:
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void operator&(std::ostream&) {}
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};
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class LogMessage {
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public:
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LogMessage(LogSeverity severity,
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const char* file,
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int line,
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const char* condition);
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~LogMessage();
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std::ostream& stream() { return stream_; }
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static void CaptureNextLog(std::ostringstream* stream);
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private:
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// This is a raw pointer so that we avoid having a non-trivially-destructible
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// static. It is only ever for use in unit tests.
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static thread_local std::ostringstream* capture_next_log_stream_;
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std::ostringstream stream_;
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const LogSeverity severity_;
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const char* file_;
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const int line_;
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FML_DISALLOW_COPY_AND_ASSIGN(LogMessage);
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};
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// Gets the FML_VLOG default verbosity level.
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int GetVlogVerbosity();
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// Returns true if |severity| is at or above the current minimum log level.
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// kLogFatal and above is always true.
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bool ShouldCreateLogMessage(LogSeverity severity);
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[[noreturn]] void KillProcess();
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} // namespace fml
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#define FML_LOG_STREAM(severity) \
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::fml::LogMessage(::fml::LOG_##severity, __FILE__, __LINE__, nullptr).stream()
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#define FML_LAZY_STREAM(stream, condition) \
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!(condition) ? (void)0 : ::fml::LogMessageVoidify() & (stream)
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#define FML_EAT_STREAM_PARAMETERS(ignored) \
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true || (ignored) \
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? (void)0 \
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: ::fml::LogMessageVoidify() & \
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::fml::LogMessage(::fml::kLogFatal, 0, 0, nullptr).stream()
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#define FML_LOG_IS_ON(severity) \
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(::fml::ShouldCreateLogMessage(::fml::LOG_##severity))
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#define FML_LOG(severity) \
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FML_LAZY_STREAM(FML_LOG_STREAM(severity), FML_LOG_IS_ON(severity))
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#define FML_CHECK(condition) \
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FML_LAZY_STREAM( \
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::fml::LogMessage(::fml::kLogFatal, __FILE__, __LINE__, #condition) \
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.stream(), \
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!(condition))
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#define FML_VLOG_IS_ON(verbose_level) \
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((verbose_level) <= ::fml::GetVlogVerbosity())
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// The VLOG macros log with negative verbosities.
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#define FML_VLOG_STREAM(verbose_level) \
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::fml::LogMessage(-verbose_level, __FILE__, __LINE__, nullptr).stream()
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#define FML_VLOG(verbose_level) \
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FML_LAZY_STREAM(FML_VLOG_STREAM(verbose_level), FML_VLOG_IS_ON(verbose_level))
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#ifndef NDEBUG
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#define FML_DLOG(severity) FML_LOG(severity)
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#define FML_DCHECK(condition) FML_CHECK(condition)
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#else
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#define FML_DLOG(severity) FML_EAT_STREAM_PARAMETERS(true)
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#define FML_DCHECK(condition) FML_EAT_STREAM_PARAMETERS(condition)
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#endif
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#define FML_UNREACHABLE() \
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{ \
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FML_LOG(ERROR) << "Reached unreachable code."; \
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::fml::KillProcess(); \
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}
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#endif // FLUTTER_FML_LOGGING_H_
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