base/check.cc - chromium/src.git - Git at Google

 // Copyright 2020 The Chromium Authors
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #include "base/check.h"

 #include <optional>

 #include "base/check_op.h"
 #include "base/check_version_internal.h"
 #include "base/debug/alias.h"
 #include "base/debug/dump_without_crashing.h"
 #include "base/feature_list.h"
 #include "base/features.h"
 #include "base/logging.h"
 #include "base/thread_annotations.h"
 #include "base/types/cxx23_to_underlying.h"
 #include "build/build_config.h"

 #if BUILDFLAG(IS_NACL)
 // Forward declaring this ptr for code simplicity below, we'll never dereference
 // it under NaCl.
 namespace base::debug {
 class CrashKeyString;
 }  // namespace base::debug
 #else
 #include "base/debug/crash_logging.h"
 #endif  // !BUILDFLAG(IS_NACL)

 namespace logging {

 namespace {

 LogSeverity GetDumpSeverity() {
 #if BUILDFLAG(USE_FUZZING_ENGINE)
   // Crash in fuzzing builds because non-fatal CHECKs will eventually be
   // migrated to fatal CHECKs.
   return LOGGING_FATAL;
 #else
   return DCHECK_IS_ON() ? LOGGING_DCHECK : LOGGING_ERROR;
 #endif
 }

 LogSeverity GetNotFatalUntilSeverity(base::NotFatalUntil fatal_milestone) {
   if (fatal_milestone != base::NotFatalUntil::NoSpecifiedMilestoneInternal &&
       base::to_underlying(fatal_milestone) <= BASE_CHECK_VERSION_INTERNAL) {
     return LOGGING_FATAL;
   }
   return GetDumpSeverity();
 }

 LogSeverity GetCheckSeverity(base::NotFatalUntil fatal_milestone) {
   // CHECKs are fatal unless `fatal_milestone` overrides it.
   if (fatal_milestone == base::NotFatalUntil::NoSpecifiedMilestoneInternal) {
     return LOGGING_FATAL;
   }
   return GetNotFatalUntilSeverity(fatal_milestone);
 }

 LogSeverity GetNotReachedSeverity(base::NotFatalUntil fatal_milestone) {
   // NOTREACHED severity is controlled by kNotReachedIsFatal unless
   // `fatal_milestone` overrides it.
   //
   // NOTREACHED() instances may be hit before base::FeatureList is enabled.
   if (fatal_milestone == base::NotFatalUntil::NoSpecifiedMilestoneInternal &&
       base::FeatureList::GetInstance() &&
       base::FeatureList::IsEnabled(base::features::kNotReachedIsFatal)) {
     return LOGGING_FATAL;
   }
   return GetNotFatalUntilSeverity(fatal_milestone);
 }

 base::debug::CrashKeyString* GetNotReachedCrashKey() {
 #if BUILDFLAG(IS_NACL)
   return nullptr;
 #else
   static auto* const key = ::base::debug::AllocateCrashKeyString(
       "Logging-NOTREACHED_MESSAGE", base::debug::CrashKeySize::Size1024);
   return key;
 #endif  // BUILDFLAG(IS_NACL)
 }

 base::debug::CrashKeyString* GetDCheckCrashKey() {
 #if BUILDFLAG(IS_NACL)
   return nullptr;
 #else
   static auto* const key = ::base::debug::AllocateCrashKeyString(
       "Logging-DCHECK_MESSAGE", base::debug::CrashKeySize::Size1024);
   return key;
 #endif  // BUILDFLAG(IS_NACL)
 }

 base::debug::CrashKeyString* GetDumpWillBeCheckCrashKey() {
 #if BUILDFLAG(IS_NACL)
   return nullptr;
 #else
   static auto* const key = ::base::debug::AllocateCrashKeyString(
       "Logging-DUMP_WILL_BE_CHECK_MESSAGE",
       base::debug::CrashKeySize::Size1024);
   return key;
 #endif  // BUILDFLAG(IS_NACL)
 }

 void DumpWithoutCrashing(base::debug::CrashKeyString* message_key,
                          const std::string& crash_string,
                          const base::Location& location,
                          base::NotFatalUntil fatal_milestone) {
 #if !BUILDFLAG(IS_NACL)
   static auto* const fatal_milestone_key =
       ::base::debug::AllocateCrashKeyString("Logging-FATAL_MILESTONE",
                                             base::debug::CrashKeySize::Size32);
   std::optional<base::debug::ScopedCrashKeyString> scoped_fatal_milestone_key;
   // Store the fatal milestone only when one is provided.
   if (fatal_milestone != base::NotFatalUntil::NoSpecifiedMilestoneInternal) {
     scoped_fatal_milestone_key.emplace(
         fatal_milestone_key,
         base::NumberToString(base::to_underlying(fatal_milestone)));
   }
   // Always store the crash string.
   base::debug::ScopedCrashKeyString scoped_message_key(message_key,
                                                        crash_string);
 #endif  // !BUILDFLAG(IS_NACL)
   // Copy the crash message to stack memory to make sure it can be recovered in
   // crash dumps. This is easier to recover in minidumps than crash keys during
   // local debugging.
   DEBUG_ALIAS_FOR_CSTR(log_message_str, crash_string.c_str(), 1024);

   // Report from the same location at most once every 30 days (unless the
   // process has died). This attempts to prevent us from flooding ourselves with
   // repeat reports for the same bug.
   base::debug::DumpWithoutCrashing(location, base::Days(30));
 }

 class NotReachedLogMessage : public LogMessage {
  public:
   NotReachedLogMessage(const base::Location& location,
                        LogSeverity severity,
                        base::NotFatalUntil fatal_milestone)
       : LogMessage(location.file_name(), location.line_number(), severity),
         location_(location),
         fatal_milestone_(fatal_milestone) {}
   ~NotReachedLogMessage() override {
     if (severity() != logging::LOGGING_FATAL) {
       DumpWithoutCrashing(GetNotReachedCrashKey(), BuildCrashString(),
                           location_, fatal_milestone_);
     }
   }

  private:
   const base::Location location_;
   const base::NotFatalUntil fatal_milestone_;
 };

 class DCheckLogMessage : public LogMessage {
  public:
   DCheckLogMessage(const base::Location& location)
       : LogMessage(location.file_name(),
                    location.line_number(),
                    LOGGING_DCHECK),
         location_(location) {}
   ~DCheckLogMessage() override {
     if (severity() != logging::LOGGING_FATAL) {
       DumpWithoutCrashing(GetDCheckCrashKey(), BuildCrashString(), location_,
                           base::NotFatalUntil::NoSpecifiedMilestoneInternal);
     }
   }

  private:
   const base::Location location_;
 };

 class CheckLogMessage : public LogMessage {
  public:
   CheckLogMessage(const base::Location& location,
                   LogSeverity severity,
                   base::NotFatalUntil fatal_milestone)
       : LogMessage(location.file_name(), location.line_number(), severity),
         location_(location),
         fatal_milestone_(fatal_milestone) {}
   ~CheckLogMessage() override {
     if (severity() != logging::LOGGING_FATAL) {
       DumpWithoutCrashing(GetDumpWillBeCheckCrashKey(), BuildCrashString(),
                           location_, fatal_milestone_);
     }
   }

  private:
   const base::Location location_;
   const base::NotFatalUntil fatal_milestone_;
 };

 #if BUILDFLAG(IS_WIN)
 class DCheckWin32ErrorLogMessage : public Win32ErrorLogMessage {
  public:
   DCheckWin32ErrorLogMessage(const base::Location& location,
                              SystemErrorCode err)
       : Win32ErrorLogMessage(location.file_name(),
                              location.line_number(),
                              LOGGING_DCHECK,
                              err),
         location_(location) {}
   ~DCheckWin32ErrorLogMessage() override {
     if (severity() != logging::LOGGING_FATAL) {
       DumpWithoutCrashing(GetDCheckCrashKey(), BuildCrashString(), location_,
                           base::NotFatalUntil::NoSpecifiedMilestoneInternal);
     }
   }

  private:
   const base::Location location_;
 };
 #elif BUILDFLAG(IS_POSIX) || BUILDFLAG(IS_FUCHSIA)
 class DCheckErrnoLogMessage : public ErrnoLogMessage {
  public:
   DCheckErrnoLogMessage(const base::Location& location, SystemErrorCode err)
       : ErrnoLogMessage(location.file_name(),
                         location.line_number(),
                         LOGGING_DCHECK,
                         err),
         location_(location) {}
   ~DCheckErrnoLogMessage() override {
     if (severity() != logging::LOGGING_FATAL) {
       DumpWithoutCrashing(GetDCheckCrashKey(), BuildCrashString(), location_,
                           base::NotFatalUntil::NoSpecifiedMilestoneInternal);
     }
   }

  private:
   const base::Location location_;
 };
 #endif  // BUILDFLAG(IS_WIN)

 }  // namespace

 CheckError CheckError::Check(const char* condition,
                              base::NotFatalUntil fatal_milestone,
                              const base::Location& location) {
   auto* const log_message = new CheckLogMessage(
       location, GetCheckSeverity(fatal_milestone), fatal_milestone);
   log_message->stream() << "Check failed: " << condition << ". ";
   return CheckError(log_message);
 }

 CheckError CheckError::CheckOp(char* log_message_str,
                                base::NotFatalUntil fatal_milestone,
                                const base::Location& location) {
   auto* const log_message = new CheckLogMessage(
       location, GetCheckSeverity(fatal_milestone), fatal_milestone);
   log_message->stream() << log_message_str;
   free(log_message_str);
   return CheckError(log_message);
 }

 CheckError CheckError::DCheck(const char* condition,
                               const base::Location& location) {
   auto* const log_message = new DCheckLogMessage(location);
   log_message->stream() << "Check failed: " << condition << ". ";
   return CheckError(log_message);
 }

 CheckError CheckError::DCheckOp(char* log_message_str,
                                 const base::Location& location) {
   auto* const log_message = new DCheckLogMessage(location);
   log_message->stream() << log_message_str;
   free(log_message_str);
   return CheckError(log_message);
 }

 CheckError CheckError::DumpWillBeCheck(const char* condition,
                                        const base::Location& location) {
   auto* const log_message =
       new CheckLogMessage(location, GetDumpSeverity(),
                           base::NotFatalUntil::NoSpecifiedMilestoneInternal);
   log_message->stream() << "Check failed: " << condition << ". ";
   return CheckError(log_message);
 }

 CheckError CheckError::DumpWillBeCheckOp(char* log_message_str,
                                          const base::Location& location) {
   auto* const log_message =
       new CheckLogMessage(location, GetDumpSeverity(),
                           base::NotFatalUntil::NoSpecifiedMilestoneInternal);
   log_message->stream() << log_message_str;
   free(log_message_str);
   return CheckError(log_message);
 }

 CheckError CheckError::PCheck(const char* condition,
                               const base::Location& location) {
   SystemErrorCode err_code = logging::GetLastSystemErrorCode();
 #if BUILDFLAG(IS_WIN)
   auto* const log_message = new Win32ErrorLogMessage(
       location.file_name(), location.line_number(), LOGGING_FATAL, err_code);
 #elif BUILDFLAG(IS_POSIX) || BUILDFLAG(IS_FUCHSIA)
   auto* const log_message = new ErrnoLogMessage(
       location.file_name(), location.line_number(), LOGGING_FATAL, err_code);
 #endif
   log_message->stream() << "Check failed: " << condition << ". ";
   return CheckError(log_message);
 }

 CheckError CheckError::PCheck(const base::Location& location) {
   return PCheck("", location);
 }

 CheckError CheckError::DPCheck(const char* condition,
                                const base::Location& location) {
   SystemErrorCode err_code = logging::GetLastSystemErrorCode();
 #if BUILDFLAG(IS_WIN)
   auto* const log_message = new DCheckWin32ErrorLogMessage(location, err_code);
 #elif BUILDFLAG(IS_POSIX) || BUILDFLAG(IS_FUCHSIA)
   auto* const log_message = new DCheckErrnoLogMessage(location, err_code);
 #endif
   log_message->stream() << "Check failed: " << condition << ". ";
   return CheckError(log_message);
 }

 CheckError CheckError::DumpWillBeNotReachedNoreturn(
     const base::Location& location) {
   auto* const log_message = new NotReachedLogMessage(
       location, GetDumpSeverity(),
       base::NotFatalUntil::NoSpecifiedMilestoneInternal);
   log_message->stream() << "NOTREACHED hit. ";
   return CheckError(log_message);
 }

 CheckError CheckError::NotImplemented(const char* function,
                                       const base::Location& location) {
   auto* const log_message = new LogMessage(
       location.file_name(), location.line_number(), LOGGING_ERROR);
   log_message->stream() << "Not implemented reached in " << function;
   return CheckError(log_message);
 }

 std::ostream& CheckError::stream() {
   return log_message_->stream();
 }

 CheckError::~CheckError() {
   // TODO(crbug.com/1409729): Consider splitting out CHECK from DCHECK so that
   // the destructor can be marked [[noreturn]] and we don't need to check
   // severity in the destructor.
   const bool is_fatal = log_message_->severity() == LOGGING_FATAL;
   // Note: This function ends up in crash stack traces. If its full name
   // changes, the crash server's magic signature logic needs to be updated.
   // See cl/306632920.

   // Reset before `ImmediateCrash()` to ensure the message is flushed.
   log_message_.reset();

   // Make sure we crash even if LOG(FATAL) has been overridden.
   // TODO(crbug.com/1409729): Remove severity checking in the destructor when
   // LOG(FATAL) is [[noreturn]] and can't be overridden.
   if (is_fatal) {
     base::ImmediateCrash();
   }
 }

 CheckError::CheckError(LogMessage* log_message) : log_message_(log_message) {}

 NotReachedError NotReachedError::NotReached(base::NotFatalUntil fatal_milestone,
                                             const base::Location& location) {
   auto* const log_message = new NotReachedLogMessage(
       location, GetNotReachedSeverity(fatal_milestone), fatal_milestone);

   // TODO(pbos): Consider a better message for NotReached(), this is here to
   // match existing behavior + test expectations.
   log_message->stream() << "Check failed: false. ";
   return NotReachedError(log_message);
 }

 void NotReachedError::TriggerNotReached() {
   // This triggers a NOTREACHED() error as the returned NotReachedError goes out
   // of scope.
   NotReached()
       << "NOTREACHED log messages are omitted in official builds. Sorry!";
 }

 NotReachedError::~NotReachedError() = default;

 NotReachedNoreturnError::NotReachedNoreturnError(const base::Location& location)
     : CheckError([location]() {
         auto* const log_message = new NotReachedLogMessage(
             location, LOGGING_FATAL,
             base::NotFatalUntil::NoSpecifiedMilestoneInternal);
         log_message->stream() << "NOTREACHED hit. ";
         return log_message;
       }()) {}

 // Note: This function ends up in crash stack traces. If its full name changes,
 // the crash server's magic signature logic needs to be updated. See
 // cl/306632920.
 NotReachedNoreturnError::~NotReachedNoreturnError() {
   // Reset before `ImmediateCrash()` to ensure the message is flushed.
   log_message_.reset();

   // Make sure we die if we haven't.
   // TODO(crbug.com/1409729): Replace this with NOTREACHED_NORETURN() once
   // LOG(FATAL) is [[noreturn]].
   base::ImmediateCrash();
 }

 void RawCheckFailure(const char* message) {
   RawLog(LOGGING_FATAL, message);
   __builtin_unreachable();
 }

 }  // namespace logging
	// Copyright 2020 The Chromium Authors
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	#include "base/check.h"

	#include <optional>

	#include "base/check_op.h"
	#include "base/check_version_internal.h"
	#include "base/debug/alias.h"
	#include "base/debug/dump_without_crashing.h"
	#include "base/feature_list.h"
	#include "base/features.h"
	#include "base/logging.h"
	#include "base/thread_annotations.h"
	#include "base/types/cxx23_to_underlying.h"
	#include "build/build_config.h"

	#if BUILDFLAG(IS_NACL)
	// Forward declaring this ptr for code simplicity below, we'll never dereference
	// it under NaCl.
	namespace base::debug {
	class CrashKeyString;
	} // namespace base::debug
	#else
	#include "base/debug/crash_logging.h"
	#endif // !BUILDFLAG(IS_NACL)

	namespace logging {

	namespace {

	LogSeverity GetDumpSeverity() {
	#if BUILDFLAG(USE_FUZZING_ENGINE)
	// Crash in fuzzing builds because non-fatal CHECKs will eventually be
	// migrated to fatal CHECKs.
	return LOGGING_FATAL;
	#else
	return DCHECK_IS_ON() ? LOGGING_DCHECK : LOGGING_ERROR;
	#endif
	}

	LogSeverity GetNotFatalUntilSeverity(base::NotFatalUntil fatal_milestone) {
	if (fatal_milestone != base::NotFatalUntil::NoSpecifiedMilestoneInternal &&
	base::to_underlying(fatal_milestone) <= BASE_CHECK_VERSION_INTERNAL) {
	return LOGGING_FATAL;
	}
	return GetDumpSeverity();
	}

	LogSeverity GetCheckSeverity(base::NotFatalUntil fatal_milestone) {
	// CHECKs are fatal unless `fatal_milestone` overrides it.
	if (fatal_milestone == base::NotFatalUntil::NoSpecifiedMilestoneInternal) {
	return LOGGING_FATAL;
	}
	return GetNotFatalUntilSeverity(fatal_milestone);
	}

	LogSeverity GetNotReachedSeverity(base::NotFatalUntil fatal_milestone) {
	// NOTREACHED severity is controlled by kNotReachedIsFatal unless
	// `fatal_milestone` overrides it.
	//
	// NOTREACHED() instances may be hit before base::FeatureList is enabled.
	if (fatal_milestone == base::NotFatalUntil::NoSpecifiedMilestoneInternal &&
	base::FeatureList::GetInstance() &&
	base::FeatureList::IsEnabled(base::features::kNotReachedIsFatal)) {
	return LOGGING_FATAL;
	}
	return GetNotFatalUntilSeverity(fatal_milestone);
	}

	base::debug::CrashKeyString* GetNotReachedCrashKey() {
	#if BUILDFLAG(IS_NACL)
	return nullptr;
	#else
	static auto* const key = ::base::debug::AllocateCrashKeyString(
	"Logging-NOTREACHED_MESSAGE", base::debug::CrashKeySize::Size1024);
	return key;
	#endif // BUILDFLAG(IS_NACL)
	}

	base::debug::CrashKeyString* GetDCheckCrashKey() {
	#if BUILDFLAG(IS_NACL)
	return nullptr;
	#else
	static auto* const key = ::base::debug::AllocateCrashKeyString(
	"Logging-DCHECK_MESSAGE", base::debug::CrashKeySize::Size1024);
	return key;
	#endif // BUILDFLAG(IS_NACL)
	}

	base::debug::CrashKeyString* GetDumpWillBeCheckCrashKey() {
	#if BUILDFLAG(IS_NACL)
	return nullptr;
	#else
	static auto* const key = ::base::debug::AllocateCrashKeyString(
	"Logging-DUMP_WILL_BE_CHECK_MESSAGE",
	base::debug::CrashKeySize::Size1024);
	return key;
	#endif // BUILDFLAG(IS_NACL)
	}

	void DumpWithoutCrashing(base::debug::CrashKeyString* message_key,
	const std::string& crash_string,
	const base::Location& location,
	base::NotFatalUntil fatal_milestone) {
	#if !BUILDFLAG(IS_NACL)
	static auto* const fatal_milestone_key =
	::base::debug::AllocateCrashKeyString("Logging-FATAL_MILESTONE",
	base::debug::CrashKeySize::Size32);
	std::optional<base::debug::ScopedCrashKeyString> scoped_fatal_milestone_key;
	// Store the fatal milestone only when one is provided.
	if (fatal_milestone != base::NotFatalUntil::NoSpecifiedMilestoneInternal) {
	scoped_fatal_milestone_key.emplace(
	fatal_milestone_key,
	base::NumberToString(base::to_underlying(fatal_milestone)));
	}
	// Always store the crash string.
	base::debug::ScopedCrashKeyString scoped_message_key(message_key,
	crash_string);
	#endif // !BUILDFLAG(IS_NACL)
	// Copy the crash message to stack memory to make sure it can be recovered in
	// crash dumps. This is easier to recover in minidumps than crash keys during
	// local debugging.
	DEBUG_ALIAS_FOR_CSTR(log_message_str, crash_string.c_str(), 1024);

	// Report from the same location at most once every 30 days (unless the
	// process has died). This attempts to prevent us from flooding ourselves with
	// repeat reports for the same bug.
	base::debug::DumpWithoutCrashing(location, base::Days(30));
	}

	class NotReachedLogMessage : public LogMessage {
	public:
	NotReachedLogMessage(const base::Location& location,
	LogSeverity severity,
	base::NotFatalUntil fatal_milestone)
	: LogMessage(location.file_name(), location.line_number(), severity),
	location_(location),
	fatal_milestone_(fatal_milestone) {}
	~NotReachedLogMessage() override {
	if (severity() != logging::LOGGING_FATAL) {
	DumpWithoutCrashing(GetNotReachedCrashKey(), BuildCrashString(),
	location_, fatal_milestone_);
	}
	}

	private:
	const base::Location location_;
	const base::NotFatalUntil fatal_milestone_;
	};

	class DCheckLogMessage : public LogMessage {
	public:
	DCheckLogMessage(const base::Location& location)
	: LogMessage(location.file_name(),
	location.line_number(),
	LOGGING_DCHECK),
	location_(location) {}
	~DCheckLogMessage() override {
	if (severity() != logging::LOGGING_FATAL) {
	DumpWithoutCrashing(GetDCheckCrashKey(), BuildCrashString(), location_,
	base::NotFatalUntil::NoSpecifiedMilestoneInternal);
	}
	}

	private:
	const base::Location location_;
	};

	class CheckLogMessage : public LogMessage {
	public:
	CheckLogMessage(const base::Location& location,
	LogSeverity severity,
	base::NotFatalUntil fatal_milestone)
	: LogMessage(location.file_name(), location.line_number(), severity),
	location_(location),
	fatal_milestone_(fatal_milestone) {}
	~CheckLogMessage() override {
	if (severity() != logging::LOGGING_FATAL) {
	DumpWithoutCrashing(GetDumpWillBeCheckCrashKey(), BuildCrashString(),
	location_, fatal_milestone_);
	}
	}

	private:
	const base::Location location_;
	const base::NotFatalUntil fatal_milestone_;
	};

	#if BUILDFLAG(IS_WIN)
	class DCheckWin32ErrorLogMessage : public Win32ErrorLogMessage {
	public:
	DCheckWin32ErrorLogMessage(const base::Location& location,
	SystemErrorCode err)
	: Win32ErrorLogMessage(location.file_name(),
	location.line_number(),
	LOGGING_DCHECK,
	err),
	location_(location) {}
	~DCheckWin32ErrorLogMessage() override {
	if (severity() != logging::LOGGING_FATAL) {
	DumpWithoutCrashing(GetDCheckCrashKey(), BuildCrashString(), location_,
	base::NotFatalUntil::NoSpecifiedMilestoneInternal);
	}
	}

	private:
	const base::Location location_;
	};
	#elif BUILDFLAG(IS_POSIX) \|\| BUILDFLAG(IS_FUCHSIA)
	class DCheckErrnoLogMessage : public ErrnoLogMessage {
	public:
	DCheckErrnoLogMessage(const base::Location& location, SystemErrorCode err)
	: ErrnoLogMessage(location.file_name(),
	location.line_number(),
	LOGGING_DCHECK,
	err),
	location_(location) {}
	~DCheckErrnoLogMessage() override {
	if (severity() != logging::LOGGING_FATAL) {
	DumpWithoutCrashing(GetDCheckCrashKey(), BuildCrashString(), location_,
	base::NotFatalUntil::NoSpecifiedMilestoneInternal);
	}
	}

	private:
	const base::Location location_;
	};
	#endif // BUILDFLAG(IS_WIN)

	} // namespace

	CheckError CheckError::Check(const char* condition,
	base::NotFatalUntil fatal_milestone,
	const base::Location& location) {
	auto* const log_message = new CheckLogMessage(
	location, GetCheckSeverity(fatal_milestone), fatal_milestone);
	log_message->stream() << "Check failed: " << condition << ". ";
	return CheckError(log_message);
	}

	CheckError CheckError::CheckOp(char* log_message_str,
	base::NotFatalUntil fatal_milestone,
	const base::Location& location) {
	auto* const log_message = new CheckLogMessage(
	location, GetCheckSeverity(fatal_milestone), fatal_milestone);
	log_message->stream() << log_message_str;
	free(log_message_str);
	return CheckError(log_message);
	}

	CheckError CheckError::DCheck(const char* condition,
	const base::Location& location) {
	auto* const log_message = new DCheckLogMessage(location);
	log_message->stream() << "Check failed: " << condition << ". ";
	return CheckError(log_message);
	}

	CheckError CheckError::DCheckOp(char* log_message_str,
	const base::Location& location) {
	auto* const log_message = new DCheckLogMessage(location);
	log_message->stream() << log_message_str;
	free(log_message_str);
	return CheckError(log_message);
	}

	CheckError CheckError::DumpWillBeCheck(const char* condition,
	const base::Location& location) {
	auto* const log_message =
	new CheckLogMessage(location, GetDumpSeverity(),
	base::NotFatalUntil::NoSpecifiedMilestoneInternal);
	log_message->stream() << "Check failed: " << condition << ". ";
	return CheckError(log_message);
	}

	CheckError CheckError::DumpWillBeCheckOp(char* log_message_str,
	const base::Location& location) {
	auto* const log_message =
	new CheckLogMessage(location, GetDumpSeverity(),
	base::NotFatalUntil::NoSpecifiedMilestoneInternal);
	log_message->stream() << log_message_str;
	free(log_message_str);
	return CheckError(log_message);
	}

	CheckError CheckError::PCheck(const char* condition,
	const base::Location& location) {
	SystemErrorCode err_code = logging::GetLastSystemErrorCode();
	#if BUILDFLAG(IS_WIN)
	auto* const log_message = new Win32ErrorLogMessage(
	location.file_name(), location.line_number(), LOGGING_FATAL, err_code);
	#elif BUILDFLAG(IS_POSIX) \|\| BUILDFLAG(IS_FUCHSIA)
	auto* const log_message = new ErrnoLogMessage(
	location.file_name(), location.line_number(), LOGGING_FATAL, err_code);
	#endif
	log_message->stream() << "Check failed: " << condition << ". ";
	return CheckError(log_message);
	}

	CheckError CheckError::PCheck(const base::Location& location) {
	return PCheck("", location);
	}

	CheckError CheckError::DPCheck(const char* condition,
	const base::Location& location) {
	SystemErrorCode err_code = logging::GetLastSystemErrorCode();
	#if BUILDFLAG(IS_WIN)
	auto* const log_message = new DCheckWin32ErrorLogMessage(location, err_code);
	#elif BUILDFLAG(IS_POSIX) \|\| BUILDFLAG(IS_FUCHSIA)
	auto* const log_message = new DCheckErrnoLogMessage(location, err_code);
	#endif
	log_message->stream() << "Check failed: " << condition << ". ";
	return CheckError(log_message);
	}

	CheckError CheckError::DumpWillBeNotReachedNoreturn(
	const base::Location& location) {
	auto* const log_message = new NotReachedLogMessage(
	location, GetDumpSeverity(),
	base::NotFatalUntil::NoSpecifiedMilestoneInternal);
	log_message->stream() << "NOTREACHED hit. ";
	return CheckError(log_message);
	}

	CheckError CheckError::NotImplemented(const char* function,
	const base::Location& location) {
	auto* const log_message = new LogMessage(
	location.file_name(), location.line_number(), LOGGING_ERROR);
	log_message->stream() << "Not implemented reached in " << function;
	return CheckError(log_message);
	}

	std::ostream& CheckError::stream() {
	return log_message_->stream();
	}

	CheckError::~CheckError() {
	// TODO(crbug.com/1409729): Consider splitting out CHECK from DCHECK so that
	// the destructor can be marked [[noreturn]] and we don't need to check
	// severity in the destructor.
	const bool is_fatal = log_message_->severity() == LOGGING_FATAL;
	// Note: This function ends up in crash stack traces. If its full name
	// changes, the crash server's magic signature logic needs to be updated.
	// See cl/306632920.

	// Reset before `ImmediateCrash()` to ensure the message is flushed.
	log_message_.reset();

	// Make sure we crash even if LOG(FATAL) has been overridden.
	// TODO(crbug.com/1409729): Remove severity checking in the destructor when
	// LOG(FATAL) is [[noreturn]] and can't be overridden.
	if (is_fatal) {
	base::ImmediateCrash();
	}
	}

	CheckError::CheckError(LogMessage* log_message) : log_message_(log_message) {}

	NotReachedError NotReachedError::NotReached(base::NotFatalUntil fatal_milestone,
	const base::Location& location) {
	auto* const log_message = new NotReachedLogMessage(
	location, GetNotReachedSeverity(fatal_milestone), fatal_milestone);

	// TODO(pbos): Consider a better message for NotReached(), this is here to
	// match existing behavior + test expectations.
	log_message->stream() << "Check failed: false. ";
	return NotReachedError(log_message);
	}

	void NotReachedError::TriggerNotReached() {
	// This triggers a NOTREACHED() error as the returned NotReachedError goes out
	// of scope.
	NotReached()
	<< "NOTREACHED log messages are omitted in official builds. Sorry!";
	}

	NotReachedError::~NotReachedError() = default;

	NotReachedNoreturnError::NotReachedNoreturnError(const base::Location& location)
	: CheckError([location]() {
	auto* const log_message = new NotReachedLogMessage(
	location, LOGGING_FATAL,
	base::NotFatalUntil::NoSpecifiedMilestoneInternal);
	log_message->stream() << "NOTREACHED hit. ";
	return log_message;
	}()) {}

	// Note: This function ends up in crash stack traces. If its full name changes,
	// the crash server's magic signature logic needs to be updated. See
	// cl/306632920.
	NotReachedNoreturnError::~NotReachedNoreturnError() {
	// Reset before `ImmediateCrash()` to ensure the message is flushed.
	log_message_.reset();

	// Make sure we die if we haven't.
	// TODO(crbug.com/1409729): Replace this with NOTREACHED_NORETURN() once
	// LOG(FATAL) is [[noreturn]].
	base::ImmediateCrash();
	}

	void RawCheckFailure(const char* message) {
	RawLog(LOGGING_FATAL, message);
	__builtin_unreachable();
	}

	} // namespace logging