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// 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.
#include "absl/log/internal/globals.h"
#include <atomic>
#include <cstdio>
#if defined(__EMSCRIPTEN__)
#include <emscripten/console.h>
#endif
#include "absl/base/attributes.h"
#include "absl/base/config.h"
#include "absl/base/internal/raw_logging.h"
#include "absl/base/log_severity.h"
#include "absl/strings/string_view.h"
#include "absl/strings/strip.h"
#include "absl/time/time.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace log_internal {
namespace {
// Keeps track of whether Logging initialization is finalized.
// Log messages generated before that will go to stderr.
ABSL_CONST_INIT std::atomic<bool> logging_initialized(false);
// The TimeZone used for logging. This may only be set once.
ABSL_CONST_INIT std::atomic<absl::TimeZone*> timezone_ptr{nullptr};
// If true, the logging library will symbolize stack in fatal messages
ABSL_CONST_INIT std::atomic<bool> symbolize_stack_trace(true);
// Specifies maximum number of stack frames to report in fatal messages.
ABSL_CONST_INIT std::atomic<int> max_frames_in_stack_trace(64);
ABSL_CONST_INIT std::atomic<bool> exit_on_dfatal(true);
ABSL_CONST_INIT std::atomic<bool> suppress_sigabort_trace(false);
} // namespace
bool IsInitialized() {
return logging_initialized.load(std::memory_order_acquire);
}
void SetInitialized() {
logging_initialized.store(true, std::memory_order_release);
}
void WriteToStderr(absl::string_view message, absl::LogSeverity severity) {
if (message.empty()) return;
#if defined(__EMSCRIPTEN__)
// In WebAssembly, bypass filesystem emulation via fwrite.
// Skip a trailing newline character as emscripten_errn adds one itself.
const auto message_minus_newline = absl::StripSuffix(message, "\n");
// emscripten_errn was introduced in 3.1.41 but broken in standalone mode
// until 3.1.43.
#if ABSL_INTERNAL_EMSCRIPTEN_VERSION >= 3001043
emscripten_errn(message_minus_newline.data(), message_minus_newline.size());
#else
std::string null_terminated_message(message_minus_newline);
_emscripten_err(null_terminated_message.c_str());
#endif
#else
// Avoid using std::cerr from this module since we may get called during
// exit code, and cerr may be partially or fully destroyed by then.
std::fwrite(message.data(), message.size(), 1, stderr);
#endif
#if defined(_WIN64) || defined(_WIN32) || defined(_WIN16)
// C99 requires stderr to not be fully-buffered by default (7.19.3.7), but
// MS CRT buffers it anyway, so we must `fflush` to ensure the string hits
// the console/file before the program dies (and takes the libc buffers
// with it).
// https://docs.microsoft.com/en-us/cpp/c-runtime-library/stream-i-o
if (severity >= absl::LogSeverity::kWarning) {
std::fflush(stderr);
}
#else
// Avoid unused parameter warning in this branch.
(void)severity;
#endif
}
void SetTimeZone(absl::TimeZone tz) {
absl::TimeZone* expected = nullptr;
absl::TimeZone* new_tz = new absl::TimeZone(tz);
// timezone_ptr can only be set once, otherwise new_tz is leaked.
if (!timezone_ptr.compare_exchange_strong(expected, new_tz,
std::memory_order_release,
std::memory_order_relaxed)) {
ABSL_RAW_LOG(FATAL,
"absl::log_internal::SetTimeZone() has already been called");
}
}
const absl::TimeZone* TimeZone() {
return timezone_ptr.load(std::memory_order_acquire);
}
bool ShouldSymbolizeLogStackTrace() {
return symbolize_stack_trace.load(std::memory_order_acquire);
}
void EnableSymbolizeLogStackTrace(bool on_off) {
symbolize_stack_trace.store(on_off, std::memory_order_release);
}
int MaxFramesInLogStackTrace() {
return max_frames_in_stack_trace.load(std::memory_order_acquire);
}
void SetMaxFramesInLogStackTrace(int max_num_frames) {
max_frames_in_stack_trace.store(max_num_frames, std::memory_order_release);
}
bool ExitOnDFatal() { return exit_on_dfatal.load(std::memory_order_acquire); }
void SetExitOnDFatal(bool on_off) {
exit_on_dfatal.store(on_off, std::memory_order_release);
}
bool SuppressSigabortTrace() {
return suppress_sigabort_trace.load(std::memory_order_acquire);
}
bool SetSuppressSigabortTrace(bool on_off) {
return suppress_sigabort_trace.exchange(on_off);
}
} // namespace log_internal
ABSL_NAMESPACE_END
} // namespace absl
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