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author | Android Build Coastguard Worker <android-build-coastguard-worker@google.com> | 2024-02-02 23:49:36 +0000 |
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committer | Android Build Coastguard Worker <android-build-coastguard-worker@google.com> | 2024-02-02 23:49:36 +0000 |
commit | 2abe333d18331e09635f444e4676a990ee9eedf9 (patch) | |
tree | fb22bbbde0c615b678d2d293a510e985be516a0f /abseil-cpp/absl/log/internal/nullstream.h | |
parent | 194e654485ff35c8a9b6d1c6740cebce93092bda (diff) | |
parent | 6f56677b3f8b18c6e63c5779bf3dceea75685c12 (diff) | |
download | libtextclassifier-2abe333d18331e09635f444e4676a990ee9eedf9.tar.gz |
Snap for 11400057 from 6f56677b3f8b18c6e63c5779bf3dceea75685c12 to simpleperf-releasesimpleperf-release
Change-Id: Iada2b682dc262b6f7c1ba17a65175406d1aa143b
Diffstat (limited to 'abseil-cpp/absl/log/internal/nullstream.h')
-rw-r--r-- | abseil-cpp/absl/log/internal/nullstream.h | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/abseil-cpp/absl/log/internal/nullstream.h b/abseil-cpp/absl/log/internal/nullstream.h new file mode 100644 index 0000000..9266852 --- /dev/null +++ b/abseil-cpp/absl/log/internal/nullstream.h @@ -0,0 +1,136 @@ +// Copyright 2022 The Abseil Authors. +// +// 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 +// +// https://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. +// +// ----------------------------------------------------------------------------- +// File: log/internal/nullstream.h +// ----------------------------------------------------------------------------- +// +// Classes `NullStream`, `NullStreamMaybeFatal ` and `NullStreamFatal` +// implement a subset of the `LogMessage` API and are used instead when logging +// of messages has been disabled. + +#ifndef ABSL_LOG_INTERNAL_NULLSTREAM_H_ +#define ABSL_LOG_INTERNAL_NULLSTREAM_H_ + +#ifdef _WIN32 +#include <cstdlib> +#else +#include <unistd.h> +#endif +#include <ios> +#include <ostream> + +#include "absl/base/attributes.h" +#include "absl/base/config.h" +#include "absl/base/log_severity.h" +#include "absl/strings/string_view.h" + +namespace absl { +ABSL_NAMESPACE_BEGIN +namespace log_internal { + +// A `NullStream` implements the API of `LogMessage` (a few methods and +// `operator<<`) but does nothing. All methods are defined inline so the +// compiler can eliminate the whole instance and discard anything that's +// streamed in. +class NullStream { + public: + NullStream& AtLocation(absl::string_view, int) { return *this; } + template <typename SourceLocationType> + NullStream& AtLocation(SourceLocationType) { + return *this; + } + NullStream& NoPrefix() { return *this; } + NullStream& WithVerbosity(int) { return *this; } + template <typename TimeType> + NullStream& WithTimestamp(TimeType) { + return *this; + } + template <typename Tid> + NullStream& WithThreadID(Tid) { + return *this; + } + template <typename LogEntryType> + NullStream& WithMetadataFrom(const LogEntryType&) { + return *this; + } + NullStream& WithPerror() { return *this; } + template <typename LogSinkType> + NullStream& ToSinkAlso(LogSinkType*) { + return *this; + } + template <typename LogSinkType> + NullStream& ToSinkOnly(LogSinkType*) { + return *this; + } + template <typename LogSinkType> + NullStream& OutputToSink(LogSinkType*, bool) { + return *this; + } + NullStream& InternalStream() { return *this; } +}; +template <typename T> +inline NullStream& operator<<(NullStream& str, const T&) { + return str; +} +inline NullStream& operator<<(NullStream& str, + std::ostream& (*)(std::ostream& os)) { + return str; +} +inline NullStream& operator<<(NullStream& str, + std::ios_base& (*)(std::ios_base& os)) { + return str; +} + +// `NullStreamMaybeFatal` implements the process termination semantics of +// `LogMessage`, which is used for `DFATAL` severity and expression-defined +// severity e.g. `LOG(LEVEL(HowBadIsIt()))`. Like `LogMessage`, it terminates +// the process when destroyed if the passed-in severity equals `FATAL`. +class NullStreamMaybeFatal final : public NullStream { + public: + explicit NullStreamMaybeFatal(absl::LogSeverity severity) + : fatal_(severity == absl::LogSeverity::kFatal) {} + ~NullStreamMaybeFatal() { + if (fatal_) { + _exit(1); + } + } + + private: + bool fatal_; +}; + +// `NullStreamFatal` implements the process termination semantics of +// `LogMessageFatal`, which means it always terminates the process. `DFATAL` +// and expression-defined severity use `NullStreamMaybeFatal` above. +class NullStreamFatal final : public NullStream { + public: + NullStreamFatal() = default; + // ABSL_ATTRIBUTE_NORETURN doesn't seem to work on destructors with msvc, so + // disable msvc's warning about the d'tor never returning. +#if defined(_MSC_VER) && !defined(__clang__) +#pragma warning(push) +#pragma warning(disable : 4722) +#endif + ABSL_ATTRIBUTE_NORETURN ~NullStreamFatal() { _exit(1); } +#if defined(_MSC_VER) && !defined(__clang__) +#pragma warning(pop) +#endif +}; + +} // namespace log_internal +ABSL_NAMESPACE_END +} // namespace absl + +#endif // ABSL_LOG_INTERNAL_GLOBALS_H_ |