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224 lines
7.8 KiB
224 lines
7.8 KiB
/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "logging.h"
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#include <iostream>
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#include <limits>
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#include <mutex>
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#include <sstream>
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#include "aborting.h"
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#include "os.h"
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#include "unix_file/fd_file.h"
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// Headers for LogMessage::LogLine.
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#ifdef ART_TARGET_ANDROID
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#include <log/log.h>
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#else
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#include <sys/types.h>
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#include <unistd.h>
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#endif
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namespace art {
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LogVerbosity gLogVerbosity;
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std::atomic<unsigned int> gAborting(0);
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static std::unique_ptr<std::string> gCmdLine;
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static std::unique_ptr<std::string> gProgramInvocationName;
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static std::unique_ptr<std::string> gProgramInvocationShortName;
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const char* GetCmdLine() {
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return (gCmdLine.get() != nullptr) ? gCmdLine->c_str() : nullptr;
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}
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const char* ProgramInvocationName() {
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return (gProgramInvocationName.get() != nullptr) ? gProgramInvocationName->c_str() : "art";
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}
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const char* ProgramInvocationShortName() {
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return (gProgramInvocationShortName.get() != nullptr) ? gProgramInvocationShortName->c_str()
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: "art";
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}
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void InitLogging(char* argv[], AbortFunction& abort_function) {
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if (gCmdLine.get() != nullptr) {
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return;
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}
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// Stash the command line for later use. We can use /proc/self/cmdline on Linux to recover this,
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// but we don't have that luxury on the Mac, and there are a couple of argv[0] variants that are
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// commonly used.
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if (argv != nullptr) {
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gCmdLine.reset(new std::string(argv[0]));
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for (size_t i = 1; argv[i] != nullptr; ++i) {
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gCmdLine->append(" ");
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gCmdLine->append(argv[i]);
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}
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gProgramInvocationName.reset(new std::string(argv[0]));
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const char* last_slash = strrchr(argv[0], '/');
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gProgramInvocationShortName.reset(new std::string((last_slash != nullptr) ? last_slash + 1
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: argv[0]));
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} else {
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// TODO: fall back to /proc/self/cmdline when argv is null on Linux.
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gCmdLine.reset(new std::string("<unset>"));
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}
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#ifdef ART_TARGET_ANDROID
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// android::base::LogdLogger breaks messages up into line delimited 4K chunks, since that is the
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// most that logd can handle per message. To prevent other threads from interleaving their
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// messages, LogdLoggerLocked uses a mutex to ensure that only one ART thread is logging at a
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// time.
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// Note that this lock makes logging after fork() unsafe in multi-threaded programs, which is part
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// of the motivation that this lock is not a part of libbase logging. Zygote guarantees that no
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// threads are running before calling fork() via ZygoteHooks.waitUntilAllThreadsStopped().
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class LogdLoggerLocked {
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public:
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LogdLoggerLocked() {}
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void operator()(android::base::LogId id,
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android::base::LogSeverity severity,
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const char* tag,
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const char* file,
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unsigned int line,
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const char* message) {
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static std::mutex* logging_lock_ = new std::mutex();
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std::lock_guard<std::mutex> guard(*logging_lock_);
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logd_logger_(id, severity, tag, file, line, message);
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}
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private:
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android::base::LogdLogger logd_logger_;
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};
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#define INIT_LOGGING_DEFAULT_LOGGER LogdLoggerLocked()
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#else
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#define INIT_LOGGING_DEFAULT_LOGGER android::base::StderrLogger
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#endif
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android::base::InitLogging(argv, INIT_LOGGING_DEFAULT_LOGGER,
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std::move<AbortFunction>(abort_function));
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#undef INIT_LOGGING_DEFAULT_LOGGER
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}
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#ifdef ART_TARGET_ANDROID
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static const android_LogPriority kLogSeverityToAndroidLogPriority[] = {
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ANDROID_LOG_VERBOSE, ANDROID_LOG_DEBUG, ANDROID_LOG_INFO, ANDROID_LOG_WARN,
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ANDROID_LOG_ERROR, ANDROID_LOG_FATAL, ANDROID_LOG_FATAL
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};
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static_assert(arraysize(kLogSeverityToAndroidLogPriority) == ::android::base::FATAL + 1,
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"Mismatch in size of kLogSeverityToAndroidLogPriority and values in LogSeverity");
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#endif
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void LogHelper::LogLineLowStack(const char* file,
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unsigned int line,
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LogSeverity log_severity,
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const char* message) {
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#ifdef ART_TARGET_ANDROID
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// Use android_writeLog() to avoid stack-based buffers used by android_printLog().
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const char* tag = ProgramInvocationShortName();
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int priority = kLogSeverityToAndroidLogPriority[static_cast<size_t>(log_severity)];
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char* buf = nullptr;
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size_t buf_size = 0u;
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if (priority == ANDROID_LOG_FATAL) {
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// Allocate buffer for snprintf(buf, buf_size, "%s:%u] %s", file, line, message) below.
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// If allocation fails, fall back to printing only the message.
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buf_size = strlen(file) + 1 /* ':' */ + std::numeric_limits<decltype(line)>::max_digits10 +
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2 /* "] " */ + strlen(message) + 1 /* terminating 0 */;
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buf = reinterpret_cast<char*>(malloc(buf_size));
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}
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if (buf != nullptr) {
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snprintf(buf, buf_size, "%s:%u] %s", file, line, message);
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android_writeLog(priority, tag, buf);
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free(buf);
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} else {
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android_writeLog(priority, tag, message);
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}
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#else
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static constexpr char kLogCharacters[] = { 'V', 'D', 'I', 'W', 'E', 'F', 'F' };
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static_assert(
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arraysize(kLogCharacters) == static_cast<size_t>(::android::base::FATAL) + 1,
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"Wrong character array size");
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const char* program_name = ProgramInvocationShortName();
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TEMP_FAILURE_RETRY(write(STDERR_FILENO, program_name, strlen(program_name)));
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TEMP_FAILURE_RETRY(write(STDERR_FILENO, " ", 1));
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TEMP_FAILURE_RETRY(write(STDERR_FILENO, &kLogCharacters[static_cast<size_t>(log_severity)], 1));
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TEMP_FAILURE_RETRY(write(STDERR_FILENO, " ", 1));
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// TODO: pid and tid.
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TEMP_FAILURE_RETRY(write(STDERR_FILENO, file, strlen(file)));
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// TODO: line.
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UNUSED(line);
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TEMP_FAILURE_RETRY(write(STDERR_FILENO, "] ", 2));
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TEMP_FAILURE_RETRY(write(STDERR_FILENO, message, strlen(message)));
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TEMP_FAILURE_RETRY(write(STDERR_FILENO, "\n", 1));
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#endif // ART_TARGET_ANDROID
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}
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bool PrintFileToLog(const std::string& file_name, android::base::LogSeverity level) {
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File file(file_name, O_RDONLY, false);
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if (!file.IsOpened()) {
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return false;
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}
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constexpr size_t kBufSize = 256; // Small buffer. Avoid stack overflow and stack size warnings.
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char buf[kBufSize + 1]; // +1 for terminator.
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size_t filled_to = 0;
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while (true) {
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DCHECK_LT(filled_to, kBufSize);
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int64_t n = TEMP_FAILURE_RETRY(read(file.Fd(), &buf[filled_to], kBufSize - filled_to));
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if (n <= 0) {
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// Print the rest of the buffer, if it exists.
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if (filled_to > 0) {
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buf[filled_to] = 0;
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LOG(level) << buf;
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}
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return n == 0;
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}
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// Scan for '\n'.
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size_t i = filled_to;
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bool found_newline = false;
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for (; i < filled_to + n; ++i) {
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if (buf[i] == '\n') {
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// Found a line break, that's something to print now.
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buf[i] = 0;
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LOG(level) << buf;
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// Copy the rest to the front.
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if (i + 1 < filled_to + n) {
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memmove(&buf[0], &buf[i + 1], filled_to + n - i - 1);
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filled_to = filled_to + n - i - 1;
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} else {
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filled_to = 0;
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}
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found_newline = true;
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break;
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}
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}
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if (found_newline) {
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continue;
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} else {
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filled_to += n;
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// Check if we must flush now.
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if (filled_to == kBufSize) {
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buf[kBufSize] = 0;
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LOG(level) << buf;
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filled_to = 0;
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}
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}
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}
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}
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} // namespace art
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