Source/ThirdParty/ANGLE/src/common/debug.h - WebKit - Git at Google

 //
 // Copyright 2002 The ANGLE Project Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //

 // debug.h: Debugging utilities. A lot of the logging code is adapted from Chromium's
 // base/logging.h.

 #ifndef COMMON_DEBUG_H_
 #define COMMON_DEBUG_H_

 #include <assert.h>
 #include <stdio.h>

 #include <iomanip>
 #include <ios>
 #include <sstream>
 #include <string>

 #include "common/angleutils.h"
 #include "common/platform.h"

 #if !defined(TRACE_OUTPUT_FILE)
 #    define TRACE_OUTPUT_FILE "angle_debug.txt"
 #endif

 namespace gl
 {

 // Pairs a D3D begin event with an end event.
 class ScopedPerfEventHelper : angle::NonCopyable
 {
   public:
     ANGLE_FORMAT_PRINTF(2, 3)
     ScopedPerfEventHelper(const char *format, ...);
     ~ScopedPerfEventHelper();

   private:
     const char *mFunctionName;
 };

 using LogSeverity = int;
 // Note: the log severities are used to index into the array of names,
 // see g_logSeverityNames.
 constexpr LogSeverity LOG_EVENT          = 0;
 constexpr LogSeverity LOG_INFO           = 1;
 constexpr LogSeverity LOG_WARN           = 2;
 constexpr LogSeverity LOG_ERR            = 3;
 constexpr LogSeverity LOG_FATAL          = 4;
 constexpr LogSeverity LOG_NUM_SEVERITIES = 5;

 void Trace(LogSeverity severity, const char *message);

 // This class more or less represents a particular log message.  You
 // create an instance of LogMessage and then stream stuff to it.
 // When you finish streaming to it, ~LogMessage is called and the
 // full message gets streamed to the appropriate destination.
 //
 // You shouldn't actually use LogMessage's constructor to log things,
 // though.  You should use the ERR() and WARN() macros.
 class LogMessage : angle::NonCopyable
 {
   public:
     // Used for ANGLE_LOG(severity).
     LogMessage(const char *function, int line, LogSeverity severity);
     ~LogMessage();
     std::ostream &stream() { return mStream; }

     LogSeverity getSeverity() const;
     std::string getMessage() const;

   private:
     const char *mFunction;
     const int mLine;
     const LogSeverity mSeverity;

     std::ostringstream mStream;
 };

 // Wraps the API/Platform-specific debug annotation functions.
 // Also handles redirecting logging destination.
 class DebugAnnotator : angle::NonCopyable
 {
   public:
     DebugAnnotator() {}
     virtual ~DebugAnnotator() {}
     virtual void beginEvent(const char *eventName, const char *eventMessage) = 0;
     virtual void endEvent(const char *eventName)                             = 0;
     virtual void setMarker(const char *markerName)                           = 0;
     virtual bool getStatus()                                                 = 0;
     // Log Message Handler that gets passed every log message,
     // when debug annotations are initialized,
     // replacing default handling by LogMessage.
     virtual void logMessage(const LogMessage &msg) const = 0;
 };

 void InitializeDebugAnnotations(DebugAnnotator *debugAnnotator);
 void UninitializeDebugAnnotations();
 bool DebugAnnotationsActive();
 bool DebugAnnotationsInitialized();

 void InitializeDebugMutexIfNeeded();

 namespace priv
 {
 // This class is used to explicitly ignore values in the conditional logging macros. This avoids
 // compiler warnings like "value computed is not used" and "statement has no effect".
 class LogMessageVoidify
 {
   public:
     LogMessageVoidify() {}
     // This has to be an operator with a precedence lower than << but higher than ?:
     void operator&(std::ostream &) {}
 };

 extern std::ostream *gSwallowStream;

 // Used by ANGLE_LOG_IS_ON to lazy-evaluate stream arguments.
 bool ShouldCreatePlatformLogMessage(LogSeverity severity);

 template <int N, typename T>
 std::ostream &FmtHex(std::ostream &os, T value)
 {
     os << "0x";

     std::ios_base::fmtflags oldFlags = os.flags();
     std::streamsize oldWidth         = os.width();
     std::ostream::char_type oldFill  = os.fill();

     os << std::hex << std::uppercase << std::setw(N) << std::setfill('0') << value;

     os.flags(oldFlags);
     os.width(oldWidth);
     os.fill(oldFill);

     return os;
 }

 template <typename T>
 std::ostream &FmtHexAutoSized(std::ostream &os, T value)
 {
     constexpr int N = sizeof(T) * 2;
     return priv::FmtHex<N>(os, value);
 }

 template <typename T>
 class FmtHexHelper
 {
   public:
     FmtHexHelper(const char *prefix, T value) : mPrefix(prefix), mValue(value) {}
     explicit FmtHexHelper(T value) : mPrefix(nullptr), mValue(value) {}

   private:
     const char *mPrefix;
     T mValue;

     friend std::ostream &operator<<(std::ostream &os, const FmtHexHelper &fmt)
     {
         if (fmt.mPrefix)
         {
             os << fmt.mPrefix;
         }
         return FmtHexAutoSized(os, fmt.mValue);
     }
 };

 }  // namespace priv

 template <typename T>
 priv::FmtHexHelper<T> FmtHex(T value)
 {
     return priv::FmtHexHelper<T>(value);
 }

 #if defined(ANGLE_PLATFORM_WINDOWS)
 priv::FmtHexHelper<HRESULT> FmtHR(HRESULT value);
 priv::FmtHexHelper<DWORD> FmtErr(DWORD value);
 #endif  // defined(ANGLE_PLATFORM_WINDOWS)

 template <typename T>
 std::ostream &FmtHex(std::ostream &os, T value)
 {
     return priv::FmtHexAutoSized(os, value);
 }

 // A few definitions of macros that don't generate much code. These are used
 // by ANGLE_LOG(). Since these are used all over our code, it's
 // better to have compact code for these operations.
 #define COMPACT_ANGLE_LOG_EX_EVENT(ClassName, ...) \
     ::gl::ClassName(__FUNCTION__, __LINE__, ::gl::LOG_EVENT, ##__VA_ARGS__)
 #define COMPACT_ANGLE_LOG_EX_INFO(ClassName, ...) \
     ::gl::ClassName(__FUNCTION__, __LINE__, ::gl::LOG_INFO, ##__VA_ARGS__)
 #define COMPACT_ANGLE_LOG_EX_WARN(ClassName, ...) \
     ::gl::ClassName(__FUNCTION__, __LINE__, ::gl::LOG_WARN, ##__VA_ARGS__)
 #define COMPACT_ANGLE_LOG_EX_ERR(ClassName, ...) \
     ::gl::ClassName(__FUNCTION__, __LINE__, ::gl::LOG_ERR, ##__VA_ARGS__)
 #define COMPACT_ANGLE_LOG_EX_FATAL(ClassName, ...) \
     ::gl::ClassName(__FUNCTION__, __LINE__, ::gl::LOG_FATAL, ##__VA_ARGS__)

 #define COMPACT_ANGLE_LOG_EVENT COMPACT_ANGLE_LOG_EX_EVENT(LogMessage)
 #define COMPACT_ANGLE_LOG_INFO COMPACT_ANGLE_LOG_EX_INFO(LogMessage)
 #define COMPACT_ANGLE_LOG_WARN COMPACT_ANGLE_LOG_EX_WARN(LogMessage)
 #define COMPACT_ANGLE_LOG_ERR COMPACT_ANGLE_LOG_EX_ERR(LogMessage)
 #define COMPACT_ANGLE_LOG_FATAL COMPACT_ANGLE_LOG_EX_FATAL(LogMessage)

 #define ANGLE_LOG_IS_ON(severity) (::gl::priv::ShouldCreatePlatformLogMessage(::gl::LOG_##severity))

 // Helper macro which avoids evaluating the arguments to a stream if the condition doesn't hold.
 // Condition is evaluated once and only once.
 #define ANGLE_LAZY_STREAM(stream, condition) \
     !(condition) ? static_cast<void>(0) : ::gl::priv::LogMessageVoidify() & (stream)

 // We use the preprocessor's merging operator, "##", so that, e.g.,
 // ANGLE_LOG(EVENT) becomes the token COMPACT_ANGLE_LOG_EVENT.  There's some funny
 // subtle difference between ostream member streaming functions (e.g.,
 // ostream::operator<<(int) and ostream non-member streaming functions
 // (e.g., ::operator<<(ostream&, string&): it turns out that it's
 // impossible to stream something like a string directly to an unnamed
 // ostream. We employ a neat hack by calling the stream() member
 // function of LogMessage which seems to avoid the problem.
 #define ANGLE_LOG_STREAM(severity) COMPACT_ANGLE_LOG_##severity.stream()

 #define ANGLE_LOG(severity) ANGLE_LAZY_STREAM(ANGLE_LOG_STREAM(severity), ANGLE_LOG_IS_ON(severity))

 }  // namespace gl

 #if defined(ANGLE_ENABLE_DEBUG_TRACE) || defined(ANGLE_ENABLE_DEBUG_ANNOTATIONS)
 #    define ANGLE_TRACE_ENABLED
 #endif

 #if !defined(NDEBUG) || defined(ANGLE_ENABLE_RELEASE_ASSERTS)
 #    define ANGLE_ENABLE_ASSERTS
 #endif

 #define INFO() ANGLE_LOG(INFO)
 #define WARN() ANGLE_LOG(WARN)
 #define ERR() ANGLE_LOG(ERR)
 #define FATAL() ANGLE_LOG(FATAL)

 // A macro to log a performance event around a scope.
 #if defined(ANGLE_TRACE_ENABLED)
 #    if defined(_MSC_VER)
 #        define EVENT(function, message, ...)                                                      \
             gl::ScopedPerfEventHelper scopedPerfEventHelper##__LINE__("%s(" message ")", function, \
                                                                       __VA_ARGS__)
 #    else
 #        define EVENT(function, message, ...)                                            \
             gl::ScopedPerfEventHelper scopedPerfEventHelper("%s(" message ")", function, \
                                                             ##__VA_ARGS__)
 #    endif  // _MSC_VER
 #else
 #    define EVENT(message, ...) (void(0))
 #endif

 #if defined(__GNUC__)
 #    define ANGLE_CRASH() __builtin_trap()
 #else
 #    define ANGLE_CRASH() ((void)(*(volatile char *)0 = 0)), __assume(0)
 #endif

 #if !defined(NDEBUG)
 #    define ANGLE_ASSERT_IMPL(expression) assert(expression)
 #else
 // TODO(jmadill): Detect if debugger is attached and break.
 #    define ANGLE_ASSERT_IMPL(expression) ANGLE_CRASH()
 #endif  // !defined(NDEBUG)

 // Note that gSwallowStream is used instead of an arbitrary LOG() stream to avoid the creation of an
 // object with a non-trivial destructor (LogMessage). On MSVC x86 (checked on 2015 Update 3), this
 // causes a few additional pointless instructions to be emitted even at full optimization level,
 // even though the : arm of the ternary operator is clearly never executed. Using a simpler object
 // to be &'d with Voidify() avoids these extra instructions. Using a simpler POD object with a
 // templated operator<< also works to avoid these instructions. However, this causes warnings on
 // statically defined implementations of operator<<(std::ostream, ...) in some .cpp files, because
 // they become defined-but-unreferenced functions. A reinterpret_cast of 0 to an ostream* also is
 // not suitable, because some compilers warn of undefined behavior.
 #define ANGLE_EAT_STREAM_PARAMETERS \
     true ? static_cast<void>(0) : ::gl::priv::LogMessageVoidify() & (*::gl::priv::gSwallowStream)

 // A macro asserting a condition and outputting failures to the debug log
 #if defined(ANGLE_ENABLE_ASSERTS)
 #    define ASSERT(expression)                                                                \
         (expression ? static_cast<void>(0)                                                    \
                     : (FATAL() << "\t! Assert failed in " << __FUNCTION__ << " (" << __FILE__ \
                                << ":" << __LINE__ << "): " << #expression))
 #else
 #    define ASSERT(condition) ANGLE_EAT_STREAM_PARAMETERS << !(condition)
 #endif  // defined(ANGLE_ENABLE_ASSERTS)

 #define UNREACHABLE_IS_NORETURN 0

 #define ANGLE_UNUSED_VARIABLE(variable) (static_cast<void>(variable))

 // A macro to indicate unimplemented functionality
 #ifndef NOASSERT_UNIMPLEMENTED
 #    define NOASSERT_UNIMPLEMENTED 1
 #endif

 #if defined(ANGLE_TRACE_ENABLED) || defined(ANGLE_ENABLE_ASSERTS)
 #    define UNIMPLEMENTED()                                                                       \
         do                                                                                        \
         {                                                                                         \
             WARN() << "\t! Unimplemented: " << __FUNCTION__ << "(" << __FILE__ << ":" << __LINE__ \
                    << ")";                                                                        \
             ASSERT(NOASSERT_UNIMPLEMENTED);                                                       \
         } while (0)

 // A macro for code which is not expected to be reached under valid assumptions
 #    define UNREACHABLE()                                                                    \
         do                                                                                   \
         {                                                                                    \
             FATAL() << "\t! Unreachable reached: " << __FUNCTION__ << "(" << __FILE__ << ":" \
                     << __LINE__ << ")";                                                      \
         } while (0)
 #else
 #    define UNIMPLEMENTED()                 \
         do                                  \
         {                                   \
             ASSERT(NOASSERT_UNIMPLEMENTED); \
         } while (0)

 // A macro for code which is not expected to be reached under valid assumptions
 #    define UNREACHABLE()  \
         do                 \
         {                  \
             ASSERT(false); \
         } while (0)
 #endif  // defined(ANGLE_TRACE_ENABLED) || defined(ANGLE_ENABLE_ASSERTS)

 #if defined(ANGLE_PLATFORM_WINDOWS)
 #    define ANGLE_FUNCTION __FUNCTION__
 #else
 #    define ANGLE_FUNCTION __func__
 #endif

 // Defining ANGLE_ENABLE_STRUCT_PADDING_WARNINGS will enable warnings when members are added to
 // structs to enforce packing. This is helpful for diagnosing unexpected struct sizes when making
 // fast cache variables.
 #if defined(__clang__)
 #    define ANGLE_ENABLE_STRUCT_PADDING_WARNINGS \
         _Pragma("clang diagnostic push") _Pragma("clang diagnostic error \"-Wpadded\"")
 #    define ANGLE_DISABLE_STRUCT_PADDING_WARNINGS _Pragma("clang diagnostic pop")
 #elif defined(__GNUC__)
 #    define ANGLE_ENABLE_STRUCT_PADDING_WARNINGS \
         _Pragma("GCC diagnostic push") _Pragma("GCC diagnostic error \"-Wpadded\"")
 #    define ANGLE_DISABLE_STRUCT_PADDING_WARNINGS _Pragma("GCC diagnostic pop")
 #elif defined(_MSC_VER)
 #    define ANGLE_ENABLE_STRUCT_PADDING_WARNINGS \
         __pragma(warning(push)) __pragma(warning(error : 4820))
 #    define ANGLE_DISABLE_STRUCT_PADDING_WARNINGS __pragma(warning(pop))
 #else
 #    define ANGLE_ENABLE_STRUCT_PADDING_WARNINGS
 #    define ANGLE_DISABLE_STRUCT_PADDING_WARNINGS
 #endif

 #if defined(__clang__)
 #    define ANGLE_DISABLE_EXTRA_SEMI_WARNING \
         _Pragma("clang diagnostic push") _Pragma("clang diagnostic ignored \"-Wextra-semi\"")
 #    define ANGLE_REENABLE_EXTRA_SEMI_WARNING _Pragma("clang diagnostic pop")
 #else
 #    define ANGLE_DISABLE_EXTRA_SEMI_WARNING
 #    define ANGLE_REENABLE_EXTRA_SEMI_WARNING
 #endif

 #endif  // COMMON_DEBUG_H_
	//
	// Copyright 2002 The ANGLE Project Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.
	//

	// debug.h: Debugging utilities. A lot of the logging code is adapted from Chromium's
	// base/logging.h.

	#ifndef COMMON_DEBUG_H_
	#define COMMON_DEBUG_H_

	#include <assert.h>
	#include <stdio.h>

	#include <iomanip>
	#include <ios>
	#include <sstream>
	#include <string>

	#include "common/angleutils.h"
	#include "common/platform.h"

	#if !defined(TRACE_OUTPUT_FILE)
	# define TRACE_OUTPUT_FILE "angle_debug.txt"
	#endif

	namespace gl
	{

	// Pairs a D3D begin event with an end event.
	class ScopedPerfEventHelper : angle::NonCopyable
	{
	public:
	ANGLE_FORMAT_PRINTF(2, 3)
	ScopedPerfEventHelper(const char *format, ...);
	~ScopedPerfEventHelper();

	private:
	const char *mFunctionName;
	};

	using LogSeverity = int;
	// Note: the log severities are used to index into the array of names,
	// see g_logSeverityNames.
	constexpr LogSeverity LOG_EVENT = 0;
	constexpr LogSeverity LOG_INFO = 1;
	constexpr LogSeverity LOG_WARN = 2;
	constexpr LogSeverity LOG_ERR = 3;
	constexpr LogSeverity LOG_FATAL = 4;
	constexpr LogSeverity LOG_NUM_SEVERITIES = 5;

	void Trace(LogSeverity severity, const char *message);

	// This class more or less represents a particular log message. You
	// create an instance of LogMessage and then stream stuff to it.
	// When you finish streaming to it, ~LogMessage is called and the
	// full message gets streamed to the appropriate destination.
	//
	// You shouldn't actually use LogMessage's constructor to log things,
	// though. You should use the ERR() and WARN() macros.
	class LogMessage : angle::NonCopyable
	{
	public:
	// Used for ANGLE_LOG(severity).
	LogMessage(const char *function, int line, LogSeverity severity);
	~LogMessage();
	std::ostream &stream() { return mStream; }

	LogSeverity getSeverity() const;
	std::string getMessage() const;

	private:
	const char *mFunction;
	const int mLine;
	const LogSeverity mSeverity;

	std::ostringstream mStream;
	};

	// Wraps the API/Platform-specific debug annotation functions.
	// Also handles redirecting logging destination.
	class DebugAnnotator : angle::NonCopyable
	{
	public:
	DebugAnnotator() {}
	virtual ~DebugAnnotator() {}
	virtual void beginEvent(const char eventName, const char eventMessage) = 0;
	virtual void endEvent(const char *eventName) = 0;
	virtual void setMarker(const char *markerName) = 0;
	virtual bool getStatus() = 0;
	// Log Message Handler that gets passed every log message,
	// when debug annotations are initialized,
	// replacing default handling by LogMessage.
	virtual void logMessage(const LogMessage &msg) const = 0;
	};

	void InitializeDebugAnnotations(DebugAnnotator *debugAnnotator);
	void UninitializeDebugAnnotations();
	bool DebugAnnotationsActive();
	bool DebugAnnotationsInitialized();

	void InitializeDebugMutexIfNeeded();

	namespace priv
	{
	// This class is used to explicitly ignore values in the conditional logging macros. This avoids
	// compiler warnings like "value computed is not used" and "statement has no effect".
	class LogMessageVoidify
	{
	public:
	LogMessageVoidify() {}
	// This has to be an operator with a precedence lower than << but higher than ?:
	void operator&(std::ostream &) {}
	};

	extern std::ostream *gSwallowStream;

	// Used by ANGLE_LOG_IS_ON to lazy-evaluate stream arguments.
	bool ShouldCreatePlatformLogMessage(LogSeverity severity);

	template <int N, typename T>
	std::ostream &FmtHex(std::ostream &os, T value)
	{
	os << "0x";

	std::ios_base::fmtflags oldFlags = os.flags();
	std::streamsize oldWidth = os.width();
	std::ostream::char_type oldFill = os.fill();

	os << std::hex << std::uppercase << std::setw(N) << std::setfill('0') << value;

	os.flags(oldFlags);
	os.width(oldWidth);
	os.fill(oldFill);

	return os;
	}

	template <typename T>
	std::ostream &FmtHexAutoSized(std::ostream &os, T value)
	{
	constexpr int N = sizeof(T) * 2;
	return priv::FmtHex<N>(os, value);
	}

	template <typename T>
	class FmtHexHelper
	{
	public:
	FmtHexHelper(const char *prefix, T value) : mPrefix(prefix), mValue(value) {}
	explicit FmtHexHelper(T value) : mPrefix(nullptr), mValue(value) {}

	private:
	const char *mPrefix;
	T mValue;

	friend std::ostream &operator<<(std::ostream &os, const FmtHexHelper &fmt)
	{
	if (fmt.mPrefix)
	{
	os << fmt.mPrefix;
	}
	return FmtHexAutoSized(os, fmt.mValue);
	}
	};

	} // namespace priv

	template <typename T>
	priv::FmtHexHelper<T> FmtHex(T value)
	{
	return priv::FmtHexHelper<T>(value);
	}

	#if defined(ANGLE_PLATFORM_WINDOWS)
	priv::FmtHexHelper<HRESULT> FmtHR(HRESULT value);
	priv::FmtHexHelper<DWORD> FmtErr(DWORD value);
	#endif // defined(ANGLE_PLATFORM_WINDOWS)

	template <typename T>
	std::ostream &FmtHex(std::ostream &os, T value)
	{
	return priv::FmtHexAutoSized(os, value);
	}

	// A few definitions of macros that don't generate much code. These are used
	// by ANGLE_LOG(). Since these are used all over our code, it's
	// better to have compact code for these operations.
	#define COMPACT_ANGLE_LOG_EX_EVENT(ClassName, ...) \
	::gl::ClassName(__FUNCTION__, __LINE__, ::gl::LOG_EVENT, ##__VA_ARGS__)
	#define COMPACT_ANGLE_LOG_EX_INFO(ClassName, ...) \
	::gl::ClassName(__FUNCTION__, __LINE__, ::gl::LOG_INFO, ##__VA_ARGS__)
	#define COMPACT_ANGLE_LOG_EX_WARN(ClassName, ...) \
	::gl::ClassName(__FUNCTION__, __LINE__, ::gl::LOG_WARN, ##__VA_ARGS__)
	#define COMPACT_ANGLE_LOG_EX_ERR(ClassName, ...) \
	::gl::ClassName(__FUNCTION__, __LINE__, ::gl::LOG_ERR, ##__VA_ARGS__)
	#define COMPACT_ANGLE_LOG_EX_FATAL(ClassName, ...) \
	::gl::ClassName(__FUNCTION__, __LINE__, ::gl::LOG_FATAL, ##__VA_ARGS__)

	#define COMPACT_ANGLE_LOG_EVENT COMPACT_ANGLE_LOG_EX_EVENT(LogMessage)
	#define COMPACT_ANGLE_LOG_INFO COMPACT_ANGLE_LOG_EX_INFO(LogMessage)
	#define COMPACT_ANGLE_LOG_WARN COMPACT_ANGLE_LOG_EX_WARN(LogMessage)
	#define COMPACT_ANGLE_LOG_ERR COMPACT_ANGLE_LOG_EX_ERR(LogMessage)
	#define COMPACT_ANGLE_LOG_FATAL COMPACT_ANGLE_LOG_EX_FATAL(LogMessage)

	#define ANGLE_LOG_IS_ON(severity) (::gl::priv::ShouldCreatePlatformLogMessage(::gl::LOG_##severity))

	// Helper macro which avoids evaluating the arguments to a stream if the condition doesn't hold.
	// Condition is evaluated once and only once.
	#define ANGLE_LAZY_STREAM(stream, condition) \
	!(condition) ? static_cast<void>(0) : ::gl::priv::LogMessageVoidify() & (stream)

	// We use the preprocessor's merging operator, "##", so that, e.g.,
	// ANGLE_LOG(EVENT) becomes the token COMPACT_ANGLE_LOG_EVENT. There's some funny
	// subtle difference between ostream member streaming functions (e.g.,
	// ostream::operator<<(int) and ostream non-member streaming functions
	// (e.g., ::operator<<(ostream&, string&): it turns out that it's
	// impossible to stream something like a string directly to an unnamed
	// ostream. We employ a neat hack by calling the stream() member
	// function of LogMessage which seems to avoid the problem.
	#define ANGLE_LOG_STREAM(severity) COMPACT_ANGLE_LOG_##severity.stream()

	#define ANGLE_LOG(severity) ANGLE_LAZY_STREAM(ANGLE_LOG_STREAM(severity), ANGLE_LOG_IS_ON(severity))

	} // namespace gl

	#if defined(ANGLE_ENABLE_DEBUG_TRACE) \|\| defined(ANGLE_ENABLE_DEBUG_ANNOTATIONS)
	# define ANGLE_TRACE_ENABLED
	#endif

	#if !defined(NDEBUG) \|\| defined(ANGLE_ENABLE_RELEASE_ASSERTS)
	# define ANGLE_ENABLE_ASSERTS
	#endif

	#define INFO() ANGLE_LOG(INFO)
	#define WARN() ANGLE_LOG(WARN)
	#define ERR() ANGLE_LOG(ERR)
	#define FATAL() ANGLE_LOG(FATAL)

	// A macro to log a performance event around a scope.
	#if defined(ANGLE_TRACE_ENABLED)
	# if defined(_MSC_VER)
	# define EVENT(function, message, ...) \
	gl::ScopedPerfEventHelper scopedPerfEventHelper##__LINE__("%s(" message ")", function, \
	__VA_ARGS__)
	# else
	# define EVENT(function, message, ...) \
	gl::ScopedPerfEventHelper scopedPerfEventHelper("%s(" message ")", function, \
	##__VA_ARGS__)
	# endif // _MSC_VER
	#else
	# define EVENT(message, ...) (void(0))
	#endif

	#if defined(__GNUC__)
	# define ANGLE_CRASH() __builtin_trap()
	#else
	# define ANGLE_CRASH() ((void)((volatile char )0 = 0)), __assume(0)
	#endif

	#if !defined(NDEBUG)
	# define ANGLE_ASSERT_IMPL(expression) assert(expression)
	#else
	// TODO(jmadill): Detect if debugger is attached and break.
	# define ANGLE_ASSERT_IMPL(expression) ANGLE_CRASH()
	#endif // !defined(NDEBUG)

	// Note that gSwallowStream is used instead of an arbitrary LOG() stream to avoid the creation of an
	// object with a non-trivial destructor (LogMessage). On MSVC x86 (checked on 2015 Update 3), this
	// causes a few additional pointless instructions to be emitted even at full optimization level,
	// even though the : arm of the ternary operator is clearly never executed. Using a simpler object
	// to be &'d with Voidify() avoids these extra instructions. Using a simpler POD object with a
	// templated operator<< also works to avoid these instructions. However, this causes warnings on
	// statically defined implementations of operator<<(std::ostream, ...) in some .cpp files, because
	// they become defined-but-unreferenced functions. A reinterpret_cast of 0 to an ostream* also is
	// not suitable, because some compilers warn of undefined behavior.
	#define ANGLE_EAT_STREAM_PARAMETERS \
	true ? static_cast<void>(0) : ::gl::priv::LogMessageVoidify() & (*::gl::priv::gSwallowStream)

	// A macro asserting a condition and outputting failures to the debug log
	#if defined(ANGLE_ENABLE_ASSERTS)
	# define ASSERT(expression) \
	(expression ? static_cast<void>(0) \
	: (FATAL() << "\t! Assert failed in " << __FUNCTION__ << " (" << __FILE__ \
	<< ":" << __LINE__ << "): " << #expression))
	#else
	# define ASSERT(condition) ANGLE_EAT_STREAM_PARAMETERS << !(condition)
	#endif // defined(ANGLE_ENABLE_ASSERTS)

	#define UNREACHABLE_IS_NORETURN 0

	#define ANGLE_UNUSED_VARIABLE(variable) (static_cast<void>(variable))

	// A macro to indicate unimplemented functionality
	#ifndef NOASSERT_UNIMPLEMENTED
	# define NOASSERT_UNIMPLEMENTED 1
	#endif

	#if defined(ANGLE_TRACE_ENABLED) \|\| defined(ANGLE_ENABLE_ASSERTS)
	# define UNIMPLEMENTED() \
	do \
	{ \
	WARN() << "\t! Unimplemented: " << __FUNCTION__ << "(" << __FILE__ << ":" << __LINE__ \
	<< ")"; \
	ASSERT(NOASSERT_UNIMPLEMENTED); \
	} while (0)

	// A macro for code which is not expected to be reached under valid assumptions
	# define UNREACHABLE() \
	do \
	{ \
	FATAL() << "\t! Unreachable reached: " << __FUNCTION__ << "(" << __FILE__ << ":" \
	<< __LINE__ << ")"; \
	} while (0)
	#else
	# define UNIMPLEMENTED() \
	do \
	{ \
	ASSERT(NOASSERT_UNIMPLEMENTED); \
	} while (0)

	// A macro for code which is not expected to be reached under valid assumptions
	# define UNREACHABLE() \
	do \
	{ \
	ASSERT(false); \
	} while (0)
	#endif // defined(ANGLE_TRACE_ENABLED) \|\| defined(ANGLE_ENABLE_ASSERTS)

	#if defined(ANGLE_PLATFORM_WINDOWS)
	# define ANGLE_FUNCTION __FUNCTION__
	#else
	# define ANGLE_FUNCTION __func__
	#endif

	// Defining ANGLE_ENABLE_STRUCT_PADDING_WARNINGS will enable warnings when members are added to
	// structs to enforce packing. This is helpful for diagnosing unexpected struct sizes when making
	// fast cache variables.
	#if defined(__clang__)
	# define ANGLE_ENABLE_STRUCT_PADDING_WARNINGS \
	_Pragma("clang diagnostic push") _Pragma("clang diagnostic error \"-Wpadded\"")
	# define ANGLE_DISABLE_STRUCT_PADDING_WARNINGS _Pragma("clang diagnostic pop")
	#elif defined(__GNUC__)
	# define ANGLE_ENABLE_STRUCT_PADDING_WARNINGS \
	_Pragma("GCC diagnostic push") _Pragma("GCC diagnostic error \"-Wpadded\"")
	# define ANGLE_DISABLE_STRUCT_PADDING_WARNINGS _Pragma("GCC diagnostic pop")
	#elif defined(_MSC_VER)
	# define ANGLE_ENABLE_STRUCT_PADDING_WARNINGS \
	__pragma(warning(push)) __pragma(warning(error : 4820))
	# define ANGLE_DISABLE_STRUCT_PADDING_WARNINGS __pragma(warning(pop))
	#else
	# define ANGLE_ENABLE_STRUCT_PADDING_WARNINGS
	# define ANGLE_DISABLE_STRUCT_PADDING_WARNINGS
	#endif

	#if defined(__clang__)
	# define ANGLE_DISABLE_EXTRA_SEMI_WARNING \
	_Pragma("clang diagnostic push") _Pragma("clang diagnostic ignored \"-Wextra-semi\"")
	# define ANGLE_REENABLE_EXTRA_SEMI_WARNING _Pragma("clang diagnostic pop")
	#else
	# define ANGLE_DISABLE_EXTRA_SEMI_WARNING
	# define ANGLE_REENABLE_EXTRA_SEMI_WARNING
	#endif

	#endif // COMMON_DEBUG_H_