src/starboard/common/log.h - cobalt - Git at Google

 // Copyright 2015 The Cobalt Authors. All Rights Reserved.
 //
 // 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.

 // Module Overview: Starboard Logging module
 //
 // Implements a set of convenience functions and macros built on top of the core
 // Starboard logging API.

 #ifndef STARBOARD_COMMON_LOG_H_
 #define STARBOARD_COMMON_LOG_H_

 #include "starboard/configuration.h"
 #include "starboard/log.h"
 #include "starboard/system.h"

 #ifdef __cplusplus

 extern "C++" {

 #include <sstream>
 #include <string>

 #if defined(COBALT_BUILD_TYPE_GOLD)
 #define SB_LOGGING_IS_OFFICIAL_BUILD 1
 #else
 #define SB_LOGGING_IS_OFFICIAL_BUILD 0
 #endif

 // This file provides a selected subset of the //base/logging/ macros and
 // assertions. See those files for more comments and details.

 namespace starboard {
 namespace logging {

 void SetMinLogLevel(SbLogPriority level);
 SbLogPriority GetMinLogLevel();
 SbLogPriority StringToLogLevel(const std::string& log_level);
 void Break();

 // An object which will dumps the stack to the given ostream, without adding any
 // frames of its own. |skip_frames| is the number of frames to skip in the dump.
 struct Stack {
   explicit Stack(int skip_frames);
   int skip_frames;
 };
 std::ostream& operator<<(std::ostream& out, const Stack& stack);

 std::ostream& operator<<(std::ostream& out, const wchar_t* wstr);
 std::ostream& operator<<(std::ostream& out, const std::wstring& wstr);

 #if defined(__cplusplus_winrt)
 inline std::ostream& operator<<(std::ostream& out, ::Platform::String ^ str);
 #endif

 const SbLogPriority SB_LOG_INFO = kSbLogPriorityInfo;
 const SbLogPriority SB_LOG_WARNING = kSbLogPriorityWarning;
 const SbLogPriority SB_LOG_ERROR = kSbLogPriorityError;
 const SbLogPriority SB_LOG_FATAL = kSbLogPriorityFatal;
 const SbLogPriority SB_LOG_0 = SB_LOG_ERROR;

 // TODO: Export this, e.g. by wrapping in straight-C functions which can then be
 // SB_EXPORT'd. Using SB_EXPORT here directly causes issues on Windows because
 // it uses std classes which also need to be exported.
 class LogMessage {
  public:
   LogMessage(const char* file, int line, SbLogPriority priority);
   ~LogMessage();

   std::ostream& stream();

  private:
   void Init(const char* file, int line);

   SbLogPriority priority_;
   std::ostringstream stream_;
   size_t message_start_;  // Offset of the start of the message (past prefix
                           // info).
   // The file and line information passed in to the constructor.
   const char* file_;
   const int line_;
 };

 class LogMessageVoidify {
  public:
   LogMessageVoidify();
   // This has to be an operator with a precedence lower than << but
   // higher than ?:
   void operator&(std::ostream&);
 };

 }  // namespace logging
 }  // namespace starboard

 #define SB_LOG_MESSAGE_INFO                            \
   ::starboard::logging::LogMessage(__FILE__, __LINE__, \
                                    ::starboard::logging::SB_LOG_INFO)
 #define SB_LOG_MESSAGE_WARNING                         \
   ::starboard::logging::LogMessage(__FILE__, __LINE__, \
                                    ::starboard::logging::SB_LOG_WARNING)
 #define SB_LOG_MESSAGE_ERROR                           \
   ::starboard::logging::LogMessage(__FILE__, __LINE__, \
                                    ::starboard::logging::SB_LOG_ERROR)
 #define SB_LOG_MESSAGE_FATAL                           \
   ::starboard::logging::LogMessage(__FILE__, __LINE__, \
                                    ::starboard::logging::SB_LOG_FATAL)

 // Compatibility with base/logging.h which defines ERROR to be 0 to workaround
 // some system header defines that do the same thing.
 #define SB_LOG_MESSAGE_0 SB_LOG_MESSAGE_ERROR

 #define SB_LOG_STREAM(severity) SB_LOG_MESSAGE_##severity.stream()
 #define SB_LAZY_STREAM(stream, condition) \
   !(condition) ? (void)0 : ::starboard::logging::LogMessageVoidify() & (stream)

 #if SB_LOGGING_IS_OFFICIAL_BUILD
 #define SB_LOG_IS_ON(severity)                         \
   ((::starboard::logging::SB_LOG_##severity >=         \
     ::starboard::logging::SB_LOG_FATAL)                \
        ? ((::starboard::logging::SB_LOG_##severity) >= \
           ::starboard::logging::GetMinLogLevel())      \
        : false)
 #else  // SB_LOGGING_IS_OFFICIAL_BUILD
 #define SB_LOG_IS_ON(severity)                  \
   ((::starboard::logging::SB_LOG_##severity) >= \
    ::starboard::logging::GetMinLogLevel())
 #endif  // SB_LOGGING_IS_OFFICIAL_BUILD

 #define SB_LOG_IF(severity, condition) \
   SB_LAZY_STREAM(SB_LOG_STREAM(severity), SB_LOG_IS_ON(severity) && (condition))
 #define SB_LOG(severity) SB_LOG_IF(severity, true)
 #define SB_EAT_STREAM_PARAMETERS SB_LOG_IF(INFO, false)
 #define SB_STACK_IF(severity, condition) \
   SB_LOG_IF(severity, condition) << "\n" << ::starboard::logging::Stack(0)
 #define SB_STACK(severity) SB_STACK_IF(severity, true)

 #if SB_LOGGING_IS_OFFICIAL_BUILD
 #define SB_CHECK(condition) \
   !(condition) ? ::starboard::logging::Break() : SB_EAT_STREAM_PARAMETERS
 #elif defined(_PREFAST_)
 #define SB_CHECK(condition) \
   __analysis_assume(condition), SB_EAT_STREAM_PARAMETERS
 #else
 #define SB_CHECK(condition) \
   SB_LOG_IF(FATAL, !(condition)) << "Check failed: " #condition ". "
 #endif  // SB_LOGGING_IS_OFFICIAL_BUILD

 #if SB_LOGGING_IS_OFFICIAL_BUILD || \
     (defined(NDEBUG) && !defined(__LB_SHELL__FORCE_LOGGING__))
 #define SB_DLOG_IS_ON(severity) false
 #define SB_DLOG_IF(severity, condition) SB_EAT_STREAM_PARAMETERS
 #else
 #define SB_DLOG_IS_ON(severity) SB_LOG_IS_ON(severity)
 #define SB_DLOG_IF(severity, condition) SB_LOG_IF(severity, condition)
 #endif

 #if SB_LOGGING_IS_OFFICIAL_BUILD || \
     (defined(NDEBUG) && !defined(DCHECK_ALWAYS_ON))
 #define SB_DCHECK(condition) SB_EAT_STREAM_PARAMETERS
 #else
 #define SB_DCHECK(condition) SB_CHECK(condition)
 #endif

 #define SB_DLOG(severity) SB_DLOG_IF(severity, SB_DLOG_IS_ON(severity))
 #define SB_DSTACK(severity) SB_STACK_IF(severity, SB_DLOG_IS_ON(severity))
 #define SB_NOTREACHED() SB_DCHECK(false)

 #define SB_NOTIMPLEMENTED_MSG "Not implemented reached in " << SB_FUNCTION

 #if !defined(SB_NOTIMPLEMENTED_POLICY)
 #if SB_LOGGING_IS_OFFICIAL_BUILD
 #define SB_NOTIMPLEMENTED_POLICY 0
 #else
 #define SB_NOTIMPLEMENTED_POLICY 5
 #endif
 #endif  // !defined(SB_NOTIMPLEMENTED_POLICY)

 #if SB_NOTIMPLEMENTED_POLICY == 0
 #define SB_NOTIMPLEMENTED() SB_EAT_STREAM_PARAMETERS
 #elif SB_NOTIMPLEMENTED_POLICY == 1
 #define SB_NOTIMPLEMENTED() SB_COMPILE_ASSERT(false, NOT_IMPLEMENTED)
 #elif SB_NOTIMPLEMENTED_POLICY == 2
 #define SB_NOTIMPLEMENTED() SB_COMPILE_ASSERT(false, NOT_IMPLEMENTED)
 #elif SB_NOTIMPLEMENTED_POLICY == 3
 #define SB_NOTIMPLEMENTED() SB_NOTREACHED()
 #elif SB_NOTIMPLEMENTED_POLICY == 4
 #define SB_NOTIMPLEMENTED() SB_LOG(ERROR) << SB_NOTIMPLEMENTED_MSG
 #elif SB_NOTIMPLEMENTED_POLICY == 5
 #define SB_NOTIMPLEMENTED()                                  \
   do {                                                       \
     static int count = 0;                                    \
     SB_LOG_IF(ERROR, 0 == count++) << SB_NOTIMPLEMENTED_MSG; \
   } while (0);                                               \
   SB_EAT_STREAM_PARAMETERS
 #endif

 }  // extern "C++"

 #else  // !__cplusplus

 // Provide a very small subset for straight-C users.
 #define SB_NOTIMPLEMENTED_IN(X) "Not implemented reached in " #X
 #define SB_NOTIMPLEMENTED_MSG SB_NOTIMPLEMENTED_IN(SB_FUNCTION)

 #define SB_CHECK(condition)                                        \
   do {                                                             \
     if (!(condition)) {                                            \
       SbLog(kSbLogPriorityError, "Check failed: " #condition "."); \
       SbSystemBreakIntoDebugger();                                 \
     }                                                              \
   } while (0)

 #if SB_LOGGING_IS_OFFICIAL_BUILD
 #define SB_NOTIMPLEMENTED()
 #define SB_DCHECK(condition)
 #else
 #define SB_DCHECK(condition) SB_CHECK(condition)
 #define SB_NOTIMPLEMENTED()                              \
   do {                                                   \
     static int count = 0;                                \
     if (0 == count++) {                                  \
       SbLog(kSbLogPriorityError, SB_NOTIMPLEMENTED_MSG); \
     }                                                    \
   } while (0)
 #endif

 #define SB_NOTREACHED() SB_DCHECK(false)
 #endif  // __cplusplus

 #endif  // STARBOARD_COMMON_LOG_H_
	// Copyright 2015 The Cobalt Authors. All Rights Reserved.
	//
	// 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.

	// Module Overview: Starboard Logging module
	//
	// Implements a set of convenience functions and macros built on top of the core
	// Starboard logging API.

	#ifndef STARBOARD_COMMON_LOG_H_
	#define STARBOARD_COMMON_LOG_H_

	#include "starboard/configuration.h"
	#include "starboard/log.h"
	#include "starboard/system.h"

	#ifdef __cplusplus

	extern "C++" {

	#include <sstream>
	#include <string>

	#if defined(COBALT_BUILD_TYPE_GOLD)
	#define SB_LOGGING_IS_OFFICIAL_BUILD 1
	#else
	#define SB_LOGGING_IS_OFFICIAL_BUILD 0
	#endif

	// This file provides a selected subset of the //base/logging/ macros and
	// assertions. See those files for more comments and details.

	namespace starboard {
	namespace logging {

	void SetMinLogLevel(SbLogPriority level);
	SbLogPriority GetMinLogLevel();
	SbLogPriority StringToLogLevel(const std::string& log_level);
	void Break();

	// An object which will dumps the stack to the given ostream, without adding any
	// frames of its own. \|skip_frames\| is the number of frames to skip in the dump.
	struct Stack {
	explicit Stack(int skip_frames);
	int skip_frames;
	};
	std::ostream& operator<<(std::ostream& out, const Stack& stack);

	std::ostream& operator<<(std::ostream& out, const wchar_t* wstr);
	std::ostream& operator<<(std::ostream& out, const std::wstring& wstr);

	#if defined(__cplusplus_winrt)
	inline std::ostream& operator<<(std::ostream& out, ::Platform::String ^ str);
	#endif

	const SbLogPriority SB_LOG_INFO = kSbLogPriorityInfo;
	const SbLogPriority SB_LOG_WARNING = kSbLogPriorityWarning;
	const SbLogPriority SB_LOG_ERROR = kSbLogPriorityError;
	const SbLogPriority SB_LOG_FATAL = kSbLogPriorityFatal;
	const SbLogPriority SB_LOG_0 = SB_LOG_ERROR;

	// TODO: Export this, e.g. by wrapping in straight-C functions which can then be
	// SB_EXPORT'd. Using SB_EXPORT here directly causes issues on Windows because
	// it uses std classes which also need to be exported.
	class LogMessage {
	public:
	LogMessage(const char* file, int line, SbLogPriority priority);
	~LogMessage();

	std::ostream& stream();

	private:
	void Init(const char* file, int line);

	SbLogPriority priority_;
	std::ostringstream stream_;
	size_t message_start_; // Offset of the start of the message (past prefix
	// info).
	// The file and line information passed in to the constructor.
	const char* file_;
	const int line_;
	};

	class LogMessageVoidify {
	public:
	LogMessageVoidify();
	// This has to be an operator with a precedence lower than << but
	// higher than ?:
	void operator&(std::ostream&);
	};

	} // namespace logging
	} // namespace starboard

	#define SB_LOG_MESSAGE_INFO \
	::starboard::logging::LogMessage(__FILE__, __LINE__, \
	::starboard::logging::SB_LOG_INFO)
	#define SB_LOG_MESSAGE_WARNING \
	::starboard::logging::LogMessage(__FILE__, __LINE__, \
	::starboard::logging::SB_LOG_WARNING)
	#define SB_LOG_MESSAGE_ERROR \
	::starboard::logging::LogMessage(__FILE__, __LINE__, \
	::starboard::logging::SB_LOG_ERROR)
	#define SB_LOG_MESSAGE_FATAL \
	::starboard::logging::LogMessage(__FILE__, __LINE__, \
	::starboard::logging::SB_LOG_FATAL)

	// Compatibility with base/logging.h which defines ERROR to be 0 to workaround
	// some system header defines that do the same thing.
	#define SB_LOG_MESSAGE_0 SB_LOG_MESSAGE_ERROR

	#define SB_LOG_STREAM(severity) SB_LOG_MESSAGE_##severity.stream()
	#define SB_LAZY_STREAM(stream, condition) \
	!(condition) ? (void)0 : ::starboard::logging::LogMessageVoidify() & (stream)

	#if SB_LOGGING_IS_OFFICIAL_BUILD
	#define SB_LOG_IS_ON(severity) \
	((::starboard::logging::SB_LOG_##severity >= \
	::starboard::logging::SB_LOG_FATAL) \
	? ((::starboard::logging::SB_LOG_##severity) >= \
	::starboard::logging::GetMinLogLevel()) \
	: false)
	#else // SB_LOGGING_IS_OFFICIAL_BUILD
	#define SB_LOG_IS_ON(severity) \
	((::starboard::logging::SB_LOG_##severity) >= \
	::starboard::logging::GetMinLogLevel())
	#endif // SB_LOGGING_IS_OFFICIAL_BUILD

	#define SB_LOG_IF(severity, condition) \
	SB_LAZY_STREAM(SB_LOG_STREAM(severity), SB_LOG_IS_ON(severity) && (condition))
	#define SB_LOG(severity) SB_LOG_IF(severity, true)
	#define SB_EAT_STREAM_PARAMETERS SB_LOG_IF(INFO, false)
	#define SB_STACK_IF(severity, condition) \
	SB_LOG_IF(severity, condition) << "\n" << ::starboard::logging::Stack(0)
	#define SB_STACK(severity) SB_STACK_IF(severity, true)

	#if SB_LOGGING_IS_OFFICIAL_BUILD
	#define SB_CHECK(condition) \
	!(condition) ? ::starboard::logging::Break() : SB_EAT_STREAM_PARAMETERS
	#elif defined(_PREFAST_)
	#define SB_CHECK(condition) \
	__analysis_assume(condition), SB_EAT_STREAM_PARAMETERS
	#else
	#define SB_CHECK(condition) \
	SB_LOG_IF(FATAL, !(condition)) << "Check failed: " #condition ". "
	#endif // SB_LOGGING_IS_OFFICIAL_BUILD

	#if SB_LOGGING_IS_OFFICIAL_BUILD \|\| \
	(defined(NDEBUG) && !defined(__LB_SHELL__FORCE_LOGGING__))
	#define SB_DLOG_IS_ON(severity) false
	#define SB_DLOG_IF(severity, condition) SB_EAT_STREAM_PARAMETERS
	#else
	#define SB_DLOG_IS_ON(severity) SB_LOG_IS_ON(severity)
	#define SB_DLOG_IF(severity, condition) SB_LOG_IF(severity, condition)
	#endif

	#if SB_LOGGING_IS_OFFICIAL_BUILD \|\| \
	(defined(NDEBUG) && !defined(DCHECK_ALWAYS_ON))
	#define SB_DCHECK(condition) SB_EAT_STREAM_PARAMETERS
	#else
	#define SB_DCHECK(condition) SB_CHECK(condition)
	#endif

	#define SB_DLOG(severity) SB_DLOG_IF(severity, SB_DLOG_IS_ON(severity))
	#define SB_DSTACK(severity) SB_STACK_IF(severity, SB_DLOG_IS_ON(severity))
	#define SB_NOTREACHED() SB_DCHECK(false)

	#define SB_NOTIMPLEMENTED_MSG "Not implemented reached in " << SB_FUNCTION

	#if !defined(SB_NOTIMPLEMENTED_POLICY)
	#if SB_LOGGING_IS_OFFICIAL_BUILD
	#define SB_NOTIMPLEMENTED_POLICY 0
	#else
	#define SB_NOTIMPLEMENTED_POLICY 5
	#endif
	#endif // !defined(SB_NOTIMPLEMENTED_POLICY)

	#if SB_NOTIMPLEMENTED_POLICY == 0
	#define SB_NOTIMPLEMENTED() SB_EAT_STREAM_PARAMETERS
	#elif SB_NOTIMPLEMENTED_POLICY == 1
	#define SB_NOTIMPLEMENTED() SB_COMPILE_ASSERT(false, NOT_IMPLEMENTED)
	#elif SB_NOTIMPLEMENTED_POLICY == 2
	#define SB_NOTIMPLEMENTED() SB_COMPILE_ASSERT(false, NOT_IMPLEMENTED)
	#elif SB_NOTIMPLEMENTED_POLICY == 3
	#define SB_NOTIMPLEMENTED() SB_NOTREACHED()
	#elif SB_NOTIMPLEMENTED_POLICY == 4
	#define SB_NOTIMPLEMENTED() SB_LOG(ERROR) << SB_NOTIMPLEMENTED_MSG
	#elif SB_NOTIMPLEMENTED_POLICY == 5
	#define SB_NOTIMPLEMENTED() \
	do { \
	static int count = 0; \
	SB_LOG_IF(ERROR, 0 == count++) << SB_NOTIMPLEMENTED_MSG; \
	} while (0); \
	SB_EAT_STREAM_PARAMETERS
	#endif

	} // extern "C++"

	#else // !__cplusplus

	// Provide a very small subset for straight-C users.
	#define SB_NOTIMPLEMENTED_IN(X) "Not implemented reached in " #X
	#define SB_NOTIMPLEMENTED_MSG SB_NOTIMPLEMENTED_IN(SB_FUNCTION)

	#define SB_CHECK(condition) \
	do { \
	if (!(condition)) { \
	SbLog(kSbLogPriorityError, "Check failed: " #condition "."); \
	SbSystemBreakIntoDebugger(); \
	} \
	} while (0)

	#if SB_LOGGING_IS_OFFICIAL_BUILD
	#define SB_NOTIMPLEMENTED()
	#define SB_DCHECK(condition)
	#else
	#define SB_DCHECK(condition) SB_CHECK(condition)
	#define SB_NOTIMPLEMENTED() \
	do { \
	static int count = 0; \
	if (0 == count++) { \
	SbLog(kSbLogPriorityError, SB_NOTIMPLEMENTED_MSG); \
	} \
	} while (0)
	#endif

	#define SB_NOTREACHED() SB_DCHECK(false)
	#endif // __cplusplus

	#endif // STARBOARD_COMMON_LOG_H_