michael@0: // Copyright (c) 2012 The Chromium Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: 
michael@0: #include "base/logging.h"
michael@0: 
michael@0: #if defined(OS_WIN)
michael@0: #include <io.h>
michael@0: #include <windows.h>
michael@0: typedef HANDLE FileHandle;
michael@0: typedef HANDLE MutexHandle;
michael@0: // Windows warns on using write().  It prefers _write().
michael@0: #define write(fd, buf, count) _write(fd, buf, static_cast<unsigned int>(count))
michael@0: // Windows doesn't define STDERR_FILENO.  Define it here.
michael@0: #define STDERR_FILENO 2
michael@0: #elif defined(OS_MACOSX)
michael@0: #include <mach/mach.h>
michael@0: #include <mach/mach_time.h>
michael@0: #include <mach-o/dyld.h>
michael@0: #elif defined(OS_POSIX)
michael@0: #if defined(OS_NACL)
michael@0: #include <sys/time.h> // timespec doesn't seem to be in <time.h>
michael@0: #else
michael@0: #include <sys/syscall.h>
michael@0: #endif
michael@0: #include <time.h>
michael@0: #endif
michael@0: 
michael@0: #if defined(OS_POSIX)
michael@0: #include <errno.h>
michael@0: #include <pthread.h>
michael@0: #include <stdio.h>
michael@0: #include <stdlib.h>
michael@0: #include <string.h>
michael@0: #include <unistd.h>
michael@0: #define MAX_PATH PATH_MAX
michael@0: typedef FILE* FileHandle;
michael@0: typedef pthread_mutex_t* MutexHandle;
michael@0: #endif
michael@0: 
michael@0: #include <algorithm>
michael@0: #include <cstring>
michael@0: #include <ctime>
michael@0: #include <iomanip>
michael@0: #include <ostream>
michael@0: 
michael@0: #include "base/base_switches.h"
michael@0: #include "base/command_line.h"
michael@0: #include "base/debug/alias.h"
michael@0: #include "base/debug/debugger.h"
michael@0: #include "base/debug/stack_trace.h"
michael@0: #include "base/posix/eintr_wrapper.h"
michael@0: #include "base/strings/string_piece.h"
michael@0: #include "base/strings/utf_string_conversions.h"
michael@0: #include "base/synchronization/lock_impl.h"
michael@0: #include "base/threading/platform_thread.h"
michael@0: #include "base/vlog.h"
michael@0: #if defined(OS_POSIX)
michael@0: #include "base/safe_strerror_posix.h"
michael@0: #endif
michael@0: 
michael@0: #if defined(OS_ANDROID)
michael@0: #include <android/log.h>
michael@0: #endif
michael@0: 
michael@0: namespace logging {
michael@0: 
michael@0: DcheckState g_dcheck_state = DISABLE_DCHECK_FOR_NON_OFFICIAL_RELEASE_BUILDS;
michael@0: 
michael@0: DcheckState get_dcheck_state() {
michael@0:   return g_dcheck_state;
michael@0: }
michael@0: 
michael@0: void set_dcheck_state(DcheckState state) {
michael@0:   g_dcheck_state = state;
michael@0: }
michael@0: 
michael@0: namespace {
michael@0: 
michael@0: VlogInfo* g_vlog_info = NULL;
michael@0: VlogInfo* g_vlog_info_prev = NULL;
michael@0: 
michael@0: const char* const log_severity_names[LOG_NUM_SEVERITIES] = {
michael@0:   "INFO", "WARNING", "ERROR", "ERROR_REPORT", "FATAL" };
michael@0: 
michael@0: int min_log_level = 0;
michael@0: 
michael@0: LoggingDestination logging_destination = LOG_DEFAULT;
michael@0: 
michael@0: // For LOG_ERROR and above, always print to stderr.
michael@0: const int kAlwaysPrintErrorLevel = LOG_ERROR;
michael@0: 
michael@0: // Which log file to use? This is initialized by InitLogging or
michael@0: // will be lazily initialized to the default value when it is
michael@0: // first needed.
michael@0: #if defined(OS_WIN)
michael@0: typedef std::wstring PathString;
michael@0: #else
michael@0: typedef std::string PathString;
michael@0: #endif
michael@0: PathString* log_file_name = NULL;
michael@0: 
michael@0: // this file is lazily opened and the handle may be NULL
michael@0: FileHandle log_file = NULL;
michael@0: 
michael@0: // what should be prepended to each message?
michael@0: bool log_process_id = false;
michael@0: bool log_thread_id = false;
michael@0: bool log_timestamp = true;
michael@0: bool log_tickcount = false;
michael@0: 
michael@0: // Should we pop up fatal debug messages in a dialog?
michael@0: bool show_error_dialogs = false;
michael@0: 
michael@0: // An assert handler override specified by the client to be called instead of
michael@0: // the debug message dialog and process termination.
michael@0: LogAssertHandlerFunction log_assert_handler = NULL;
michael@0: // An report handler override specified by the client to be called instead of
michael@0: // the debug message dialog.
michael@0: LogReportHandlerFunction log_report_handler = NULL;
michael@0: // A log message handler that gets notified of every log message we process.
michael@0: LogMessageHandlerFunction log_message_handler = NULL;
michael@0: 
michael@0: // Helper functions to wrap platform differences.
michael@0: 
michael@0: int32 CurrentProcessId() {
michael@0: #if defined(OS_WIN)
michael@0:   return GetCurrentProcessId();
michael@0: #elif defined(OS_POSIX)
michael@0:   return getpid();
michael@0: #endif
michael@0: }
michael@0: 
michael@0: uint64 TickCount() {
michael@0: #if defined(OS_WIN)
michael@0:   return GetTickCount();
michael@0: #elif defined(OS_MACOSX)
michael@0:   return mach_absolute_time();
michael@0: #elif defined(OS_NACL)
michael@0:   // NaCl sadly does not have _POSIX_TIMERS enabled in sys/features.h
michael@0:   // So we have to use clock() for now.
michael@0:   return clock();
michael@0: #elif defined(OS_POSIX)
michael@0:   struct timespec ts;
michael@0:   clock_gettime(CLOCK_MONOTONIC, &ts);
michael@0: 
michael@0:   uint64 absolute_micro =
michael@0:     static_cast<int64>(ts.tv_sec) * 1000000 +
michael@0:     static_cast<int64>(ts.tv_nsec) / 1000;
michael@0: 
michael@0:   return absolute_micro;
michael@0: #endif
michael@0: }
michael@0: 
michael@0: void DeleteFilePath(const PathString& log_name) {
michael@0: #if defined(OS_WIN)
michael@0:   DeleteFile(log_name.c_str());
michael@0: #elif defined (OS_NACL)
michael@0:   // Do nothing; unlink() isn't supported on NaCl.
michael@0: #else
michael@0:   unlink(log_name.c_str());
michael@0: #endif
michael@0: }
michael@0: 
michael@0: PathString GetDefaultLogFile() {
michael@0: #if defined(OS_WIN)
michael@0:   // On Windows we use the same path as the exe.
michael@0:   wchar_t module_name[MAX_PATH];
michael@0:   GetModuleFileName(NULL, module_name, MAX_PATH);
michael@0: 
michael@0:   PathString log_file = module_name;
michael@0:   PathString::size_type last_backslash =
michael@0:       log_file.rfind('\\', log_file.size());
michael@0:   if (last_backslash != PathString::npos)
michael@0:     log_file.erase(last_backslash + 1);
michael@0:   log_file += L"debug.log";
michael@0:   return log_file;
michael@0: #elif defined(OS_POSIX)
michael@0:   // On other platforms we just use the current directory.
michael@0:   return PathString("debug.log");
michael@0: #endif
michael@0: }
michael@0: 
michael@0: // This class acts as a wrapper for locking the logging files.
michael@0: // LoggingLock::Init() should be called from the main thread before any logging
michael@0: // is done. Then whenever logging, be sure to have a local LoggingLock
michael@0: // instance on the stack. This will ensure that the lock is unlocked upon
michael@0: // exiting the frame.
michael@0: // LoggingLocks can not be nested.
michael@0: class LoggingLock {
michael@0:  public:
michael@0:   LoggingLock() {
michael@0:     LockLogging();
michael@0:   }
michael@0: 
michael@0:   ~LoggingLock() {
michael@0:     UnlockLogging();
michael@0:   }
michael@0: 
michael@0:   static void Init(LogLockingState lock_log, const PathChar* new_log_file) {
michael@0:     if (initialized)
michael@0:       return;
michael@0:     lock_log_file = lock_log;
michael@0:     if (lock_log_file == LOCK_LOG_FILE) {
michael@0: #if defined(OS_WIN)
michael@0:       if (!log_mutex) {
michael@0:         std::wstring safe_name;
michael@0:         if (new_log_file)
michael@0:           safe_name = new_log_file;
michael@0:         else
michael@0:           safe_name = GetDefaultLogFile();
michael@0:         // \ is not a legal character in mutex names so we replace \ with /
michael@0:         std::replace(safe_name.begin(), safe_name.end(), '\\', '/');
michael@0:         std::wstring t(L"Global\\");
michael@0:         t.append(safe_name);
michael@0:         log_mutex = ::CreateMutex(NULL, FALSE, t.c_str());
michael@0: 
michael@0:         if (log_mutex == NULL) {
michael@0: #if DEBUG
michael@0:           // Keep the error code for debugging
michael@0:           int error = GetLastError();  // NOLINT
michael@0:           base::debug::BreakDebugger();
michael@0: #endif
michael@0:           // Return nicely without putting initialized to true.
michael@0:           return;
michael@0:         }
michael@0:       }
michael@0: #endif
michael@0:     } else {
michael@0:       log_lock = new base::internal::LockImpl();
michael@0:     }
michael@0:     initialized = true;
michael@0:   }
michael@0: 
michael@0:  private:
michael@0:   static void LockLogging() {
michael@0:     if (lock_log_file == LOCK_LOG_FILE) {
michael@0: #if defined(OS_WIN)
michael@0:       ::WaitForSingleObject(log_mutex, INFINITE);
michael@0:       // WaitForSingleObject could have returned WAIT_ABANDONED. We don't
michael@0:       // abort the process here. UI tests might be crashy sometimes,
michael@0:       // and aborting the test binary only makes the problem worse.
michael@0:       // We also don't use LOG macros because that might lead to an infinite
michael@0:       // loop. For more info see http://crbug.com/18028.
michael@0: #elif defined(OS_POSIX)
michael@0:       pthread_mutex_lock(&log_mutex);
michael@0: #endif
michael@0:     } else {
michael@0:       // use the lock
michael@0:       log_lock->Lock();
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   static void UnlockLogging() {
michael@0:     if (lock_log_file == LOCK_LOG_FILE) {
michael@0: #if defined(OS_WIN)
michael@0:       ReleaseMutex(log_mutex);
michael@0: #elif defined(OS_POSIX)
michael@0:       pthread_mutex_unlock(&log_mutex);
michael@0: #endif
michael@0:     } else {
michael@0:       log_lock->Unlock();
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   // The lock is used if log file locking is false. It helps us avoid problems
michael@0:   // with multiple threads writing to the log file at the same time.  Use
michael@0:   // LockImpl directly instead of using Lock, because Lock makes logging calls.
michael@0:   static base::internal::LockImpl* log_lock;
michael@0: 
michael@0:   // When we don't use a lock, we are using a global mutex. We need to do this
michael@0:   // because LockFileEx is not thread safe.
michael@0: #if defined(OS_WIN)
michael@0:   static MutexHandle log_mutex;
michael@0: #elif defined(OS_POSIX)
michael@0:   static pthread_mutex_t log_mutex;
michael@0: #endif
michael@0: 
michael@0:   static bool initialized;
michael@0:   static LogLockingState lock_log_file;
michael@0: };
michael@0: 
michael@0: // static
michael@0: bool LoggingLock::initialized = false;
michael@0: // static
michael@0: base::internal::LockImpl* LoggingLock::log_lock = NULL;
michael@0: // static
michael@0: LogLockingState LoggingLock::lock_log_file = LOCK_LOG_FILE;
michael@0: 
michael@0: #if defined(OS_WIN)
michael@0: // static
michael@0: MutexHandle LoggingLock::log_mutex = NULL;
michael@0: #elif defined(OS_POSIX)
michael@0: pthread_mutex_t LoggingLock::log_mutex = PTHREAD_MUTEX_INITIALIZER;
michael@0: #endif
michael@0: 
michael@0: // Called by logging functions to ensure that debug_file is initialized
michael@0: // and can be used for writing. Returns false if the file could not be
michael@0: // initialized. debug_file will be NULL in this case.
michael@0: bool InitializeLogFileHandle() {
michael@0:   if (log_file)
michael@0:     return true;
michael@0: 
michael@0:   if (!log_file_name) {
michael@0:     // Nobody has called InitLogging to specify a debug log file, so here we
michael@0:     // initialize the log file name to a default.
michael@0:     log_file_name = new PathString(GetDefaultLogFile());
michael@0:   }
michael@0: 
michael@0:   if ((logging_destination & LOG_TO_FILE) != 0) {
michael@0: #if defined(OS_WIN)
michael@0:     log_file = CreateFile(log_file_name->c_str(), GENERIC_WRITE,
michael@0:                           FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
michael@0:                           OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
michael@0:     if (log_file == INVALID_HANDLE_VALUE || log_file == NULL) {
michael@0:       // try the current directory
michael@0:       log_file = CreateFile(L".\\debug.log", GENERIC_WRITE,
michael@0:                             FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
michael@0:                             OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
michael@0:       if (log_file == INVALID_HANDLE_VALUE || log_file == NULL) {
michael@0:         log_file = NULL;
michael@0:         return false;
michael@0:       }
michael@0:     }
michael@0:     SetFilePointer(log_file, 0, 0, FILE_END);
michael@0: #elif defined(OS_POSIX)
michael@0:     log_file = fopen(log_file_name->c_str(), "a");
michael@0:     if (log_file == NULL)
michael@0:       return false;
michael@0: #endif
michael@0:   }
michael@0: 
michael@0:   return true;
michael@0: }
michael@0: 
michael@0: void CloseFile(FileHandle log) {
michael@0: #if defined(OS_WIN)
michael@0:   CloseHandle(log);
michael@0: #else
michael@0:   fclose(log);
michael@0: #endif
michael@0: }
michael@0: 
michael@0: void CloseLogFileUnlocked() {
michael@0:   if (!log_file)
michael@0:     return;
michael@0: 
michael@0:   CloseFile(log_file);
michael@0:   log_file = NULL;
michael@0: }
michael@0: 
michael@0: }  // namespace
michael@0: 
michael@0: LoggingSettings::LoggingSettings()
michael@0:     : logging_dest(LOG_DEFAULT),
michael@0:       log_file(NULL),
michael@0:       lock_log(LOCK_LOG_FILE),
michael@0:       delete_old(APPEND_TO_OLD_LOG_FILE),
michael@0:       dcheck_state(DISABLE_DCHECK_FOR_NON_OFFICIAL_RELEASE_BUILDS) {}
michael@0: 
michael@0: bool BaseInitLoggingImpl(const LoggingSettings& settings) {
michael@0: #if defined(OS_NACL)
michael@0:   // Can log only to the system debug log.
michael@0:   CHECK_EQ(settings.logging_dest & ~LOG_TO_SYSTEM_DEBUG_LOG, 0);
michael@0: #endif
michael@0:   g_dcheck_state = settings.dcheck_state;
michael@0:   CommandLine* command_line = CommandLine::ForCurrentProcess();
michael@0:   // Don't bother initializing g_vlog_info unless we use one of the
michael@0:   // vlog switches.
michael@0:   if (command_line->HasSwitch(switches::kV) ||
michael@0:       command_line->HasSwitch(switches::kVModule)) {
michael@0:     // NOTE: If g_vlog_info has already been initialized, it might be in use
michael@0:     // by another thread. Don't delete the old VLogInfo, just create a second
michael@0:     // one. We keep track of both to avoid memory leak warnings.
michael@0:     CHECK(!g_vlog_info_prev);
michael@0:     g_vlog_info_prev = g_vlog_info;
michael@0: 
michael@0:     g_vlog_info =
michael@0:         new VlogInfo(command_line->GetSwitchValueASCII(switches::kV),
michael@0:                      command_line->GetSwitchValueASCII(switches::kVModule),
michael@0:                      &min_log_level);
michael@0:   }
michael@0: 
michael@0:   logging_destination = settings.logging_dest;
michael@0: 
michael@0:   // ignore file options unless logging to file is set.
michael@0:   if ((logging_destination & LOG_TO_FILE) == 0)
michael@0:     return true;
michael@0: 
michael@0:   LoggingLock::Init(settings.lock_log, settings.log_file);
michael@0:   LoggingLock logging_lock;
michael@0: 
michael@0:   // Calling InitLogging twice or after some log call has already opened the
michael@0:   // default log file will re-initialize to the new options.
michael@0:   CloseLogFileUnlocked();
michael@0: 
michael@0:   if (!log_file_name)
michael@0:     log_file_name = new PathString();
michael@0:   *log_file_name = settings.log_file;
michael@0:   if (settings.delete_old == DELETE_OLD_LOG_FILE)
michael@0:     DeleteFilePath(*log_file_name);
michael@0: 
michael@0:   return InitializeLogFileHandle();
michael@0: }
michael@0: 
michael@0: void SetMinLogLevel(int level) {
michael@0:   min_log_level = std::min(LOG_ERROR_REPORT, level);
michael@0: }
michael@0: 
michael@0: int GetMinLogLevel() {
michael@0:   return min_log_level;
michael@0: }
michael@0: 
michael@0: int GetVlogVerbosity() {
michael@0:   return std::max(-1, LOG_INFO - GetMinLogLevel());
michael@0: }
michael@0: 
michael@0: int GetVlogLevelHelper(const char* file, size_t N) {
michael@0:   DCHECK_GT(N, 0U);
michael@0:   // Note: g_vlog_info may change on a different thread during startup
michael@0:   // (but will always be valid or NULL).
michael@0:   VlogInfo* vlog_info = g_vlog_info;
michael@0:   return vlog_info ?
michael@0:       vlog_info->GetVlogLevel(base::StringPiece(file, N - 1)) :
michael@0:       GetVlogVerbosity();
michael@0: }
michael@0: 
michael@0: void SetLogItems(bool enable_process_id, bool enable_thread_id,
michael@0:                  bool enable_timestamp, bool enable_tickcount) {
michael@0:   log_process_id = enable_process_id;
michael@0:   log_thread_id = enable_thread_id;
michael@0:   log_timestamp = enable_timestamp;
michael@0:   log_tickcount = enable_tickcount;
michael@0: }
michael@0: 
michael@0: void SetShowErrorDialogs(bool enable_dialogs) {
michael@0:   show_error_dialogs = enable_dialogs;
michael@0: }
michael@0: 
michael@0: void SetLogAssertHandler(LogAssertHandlerFunction handler) {
michael@0:   log_assert_handler = handler;
michael@0: }
michael@0: 
michael@0: void SetLogReportHandler(LogReportHandlerFunction handler) {
michael@0:   log_report_handler = handler;
michael@0: }
michael@0: 
michael@0: void SetLogMessageHandler(LogMessageHandlerFunction handler) {
michael@0:   log_message_handler = handler;
michael@0: }
michael@0: 
michael@0: LogMessageHandlerFunction GetLogMessageHandler() {
michael@0:   return log_message_handler;
michael@0: }
michael@0: 
michael@0: // MSVC doesn't like complex extern templates and DLLs.
michael@0: #if !defined(COMPILER_MSVC)
michael@0: // Explicit instantiations for commonly used comparisons.
michael@0: template std::string* MakeCheckOpString<int, int>(
michael@0:     const int&, const int&, const char* names);
michael@0: template std::string* MakeCheckOpString<unsigned long, unsigned long>(
michael@0:     const unsigned long&, const unsigned long&, const char* names);
michael@0: template std::string* MakeCheckOpString<unsigned long, unsigned int>(
michael@0:     const unsigned long&, const unsigned int&, const char* names);
michael@0: template std::string* MakeCheckOpString<unsigned int, unsigned long>(
michael@0:     const unsigned int&, const unsigned long&, const char* names);
michael@0: template std::string* MakeCheckOpString<std::string, std::string>(
michael@0:     const std::string&, const std::string&, const char* name);
michael@0: #endif
michael@0: 
michael@0: // Displays a message box to the user with the error message in it.
michael@0: // Used for fatal messages, where we close the app simultaneously.
michael@0: // This is for developers only; we don't use this in circumstances
michael@0: // (like release builds) where users could see it, since users don't
michael@0: // understand these messages anyway.
michael@0: void DisplayDebugMessageInDialog(const std::string& str) {
michael@0:   if (str.empty())
michael@0:     return;
michael@0: 
michael@0:   if (!show_error_dialogs)
michael@0:     return;
michael@0: 
michael@0: #if defined(OS_WIN)
michael@0:   // For Windows programs, it's possible that the message loop is
michael@0:   // messed up on a fatal error, and creating a MessageBox will cause
michael@0:   // that message loop to be run. Instead, we try to spawn another
michael@0:   // process that displays its command line. We look for "Debug
michael@0:   // Message.exe" in the same directory as the application. If it
michael@0:   // exists, we use it, otherwise, we use a regular message box.
michael@0:   wchar_t prog_name[MAX_PATH];
michael@0:   GetModuleFileNameW(NULL, prog_name, MAX_PATH);
michael@0:   wchar_t* backslash = wcsrchr(prog_name, '\\');
michael@0:   if (backslash)
michael@0:     backslash[1] = 0;
michael@0:   wcscat_s(prog_name, MAX_PATH, L"debug_message.exe");
michael@0: 
michael@0:   std::wstring cmdline = UTF8ToWide(str);
michael@0:   if (cmdline.empty())
michael@0:     return;
michael@0: 
michael@0:   STARTUPINFO startup_info;
michael@0:   memset(&startup_info, 0, sizeof(startup_info));
michael@0:   startup_info.cb = sizeof(startup_info);
michael@0: 
michael@0:   PROCESS_INFORMATION process_info;
michael@0:   if (CreateProcessW(prog_name, &cmdline[0], NULL, NULL, false, 0, NULL,
michael@0:                      NULL, &startup_info, &process_info)) {
michael@0:     WaitForSingleObject(process_info.hProcess, INFINITE);
michael@0:     CloseHandle(process_info.hThread);
michael@0:     CloseHandle(process_info.hProcess);
michael@0:   } else {
michael@0:     // debug process broken, let's just do a message box
michael@0:     MessageBoxW(NULL, &cmdline[0], L"Fatal error",
michael@0:                 MB_OK | MB_ICONHAND | MB_TOPMOST);
michael@0:   }
michael@0: #else
michael@0:   // We intentionally don't implement a dialog on other platforms.
michael@0:   // You can just look at stderr.
michael@0: #endif
michael@0: }
michael@0: 
michael@0: #if defined(OS_WIN)
michael@0: LogMessage::SaveLastError::SaveLastError() : last_error_(::GetLastError()) {
michael@0: }
michael@0: 
michael@0: LogMessage::SaveLastError::~SaveLastError() {
michael@0:   ::SetLastError(last_error_);
michael@0: }
michael@0: #endif  // defined(OS_WIN)
michael@0: 
michael@0: LogMessage::LogMessage(const char* file, int line, LogSeverity severity,
michael@0:                        int ctr)
michael@0:     : severity_(severity), file_(file), line_(line) {
michael@0:   Init(file, line);
michael@0: }
michael@0: 
michael@0: LogMessage::LogMessage(const char* file, int line)
michael@0:     : severity_(LOG_INFO), file_(file), line_(line) {
michael@0:   Init(file, line);
michael@0: }
michael@0: 
michael@0: LogMessage::LogMessage(const char* file, int line, LogSeverity severity)
michael@0:     : severity_(severity), file_(file), line_(line) {
michael@0:   Init(file, line);
michael@0: }
michael@0: 
michael@0: LogMessage::LogMessage(const char* file, int line, std::string* result)
michael@0:     : severity_(LOG_FATAL), file_(file), line_(line) {
michael@0:   Init(file, line);
michael@0:   stream_ << "Check failed: " << *result;
michael@0:   delete result;
michael@0: }
michael@0: 
michael@0: LogMessage::LogMessage(const char* file, int line, LogSeverity severity,
michael@0:                        std::string* result)
michael@0:     : severity_(severity), file_(file), line_(line) {
michael@0:   Init(file, line);
michael@0:   stream_ << "Check failed: " << *result;
michael@0:   delete result;
michael@0: }
michael@0: 
michael@0: LogMessage::~LogMessage() {
michael@0: #if !defined(NDEBUG) && !defined(OS_NACL)
michael@0:   if (severity_ == LOG_FATAL) {
michael@0:     // Include a stack trace on a fatal.
michael@0:     base::debug::StackTrace trace;
michael@0:     stream_ << std::endl;  // Newline to separate from log message.
michael@0:     trace.OutputToStream(&stream_);
michael@0:   }
michael@0: #endif
michael@0:   stream_ << std::endl;
michael@0:   std::string str_newline(stream_.str());
michael@0: 
michael@0:   // Give any log message handler first dibs on the message.
michael@0:   if (log_message_handler &&
michael@0:       log_message_handler(severity_, file_, line_,
michael@0:                           message_start_, str_newline)) {
michael@0:     // The handler took care of it, no further processing.
michael@0:     return;
michael@0:   }
michael@0: 
michael@0:   if ((logging_destination & LOG_TO_SYSTEM_DEBUG_LOG) != 0) {
michael@0: #if defined(OS_WIN)
michael@0:     OutputDebugStringA(str_newline.c_str());
michael@0: #elif defined(OS_ANDROID)
michael@0:     android_LogPriority priority =
michael@0:         (severity_ < 0) ? ANDROID_LOG_VERBOSE : ANDROID_LOG_UNKNOWN;
michael@0:     switch (severity_) {
michael@0:       case LOG_INFO:
michael@0:         priority = ANDROID_LOG_INFO;
michael@0:         break;
michael@0:       case LOG_WARNING:
michael@0:         priority = ANDROID_LOG_WARN;
michael@0:         break;
michael@0:       case LOG_ERROR:
michael@0:       case LOG_ERROR_REPORT:
michael@0:         priority = ANDROID_LOG_ERROR;
michael@0:         break;
michael@0:       case LOG_FATAL:
michael@0:         priority = ANDROID_LOG_FATAL;
michael@0:         break;
michael@0:     }
michael@0:     __android_log_write(priority, "chromium", str_newline.c_str());
michael@0: #endif
michael@0:     fprintf(stderr, "%s", str_newline.c_str());
michael@0:     fflush(stderr);
michael@0:   } else if (severity_ >= kAlwaysPrintErrorLevel) {
michael@0:     // When we're only outputting to a log file, above a certain log level, we
michael@0:     // should still output to stderr so that we can better detect and diagnose
michael@0:     // problems with unit tests, especially on the buildbots.
michael@0:     fprintf(stderr, "%s", str_newline.c_str());
michael@0:     fflush(stderr);
michael@0:   }
michael@0: 
michael@0:   // write to log file
michael@0:   if ((logging_destination & LOG_TO_FILE) != 0) {
michael@0:     // We can have multiple threads and/or processes, so try to prevent them
michael@0:     // from clobbering each other's writes.
michael@0:     // If the client app did not call InitLogging, and the lock has not
michael@0:     // been created do it now. We do this on demand, but if two threads try
michael@0:     // to do this at the same time, there will be a race condition to create
michael@0:     // the lock. This is why InitLogging should be called from the main
michael@0:     // thread at the beginning of execution.
michael@0:     LoggingLock::Init(LOCK_LOG_FILE, NULL);
michael@0:     LoggingLock logging_lock;
michael@0:     if (InitializeLogFileHandle()) {
michael@0: #if defined(OS_WIN)
michael@0:       SetFilePointer(log_file, 0, 0, SEEK_END);
michael@0:       DWORD num_written;
michael@0:       WriteFile(log_file,
michael@0:                 static_cast<const void*>(str_newline.c_str()),
michael@0:                 static_cast<DWORD>(str_newline.length()),
michael@0:                 &num_written,
michael@0:                 NULL);
michael@0: #else
michael@0:       fprintf(log_file, "%s", str_newline.c_str());
michael@0:       fflush(log_file);
michael@0: #endif
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   if (severity_ == LOG_FATAL) {
michael@0:     // Ensure the first characters of the string are on the stack so they
michael@0:     // are contained in minidumps for diagnostic purposes.
michael@0:     char str_stack[1024];
michael@0:     str_newline.copy(str_stack, arraysize(str_stack));
michael@0:     base::debug::Alias(str_stack);
michael@0: 
michael@0:     // display a message or break into the debugger on a fatal error
michael@0:     if (base::debug::BeingDebugged()) {
michael@0:       base::debug::BreakDebugger();
michael@0:     } else {
michael@0:       if (log_assert_handler) {
michael@0:         // make a copy of the string for the handler out of paranoia
michael@0:         log_assert_handler(std::string(stream_.str()));
michael@0:       } else {
michael@0:         // Don't use the string with the newline, get a fresh version to send to
michael@0:         // the debug message process. We also don't display assertions to the
michael@0:         // user in release mode. The enduser can't do anything with this
michael@0:         // information, and displaying message boxes when the application is
michael@0:         // hosed can cause additional problems.
michael@0: #ifndef NDEBUG
michael@0:         DisplayDebugMessageInDialog(stream_.str());
michael@0: #endif
michael@0:         // Crash the process to generate a dump.
michael@0:         base::debug::BreakDebugger();
michael@0:       }
michael@0:     }
michael@0:   } else if (severity_ == LOG_ERROR_REPORT) {
michael@0:     // We are here only if the user runs with --enable-dcheck in release mode.
michael@0:     if (log_report_handler) {
michael@0:       log_report_handler(std::string(stream_.str()));
michael@0:     } else {
michael@0:       DisplayDebugMessageInDialog(stream_.str());
michael@0:     }
michael@0:   }
michael@0: }
michael@0: 
michael@0: // writes the common header info to the stream
michael@0: void LogMessage::Init(const char* file, int line) {
michael@0:   base::StringPiece filename(file);
michael@0:   size_t last_slash_pos = filename.find_last_of("\\/");
michael@0:   if (last_slash_pos != base::StringPiece::npos)
michael@0:     filename.remove_prefix(last_slash_pos + 1);
michael@0: 
michael@0:   // TODO(darin): It might be nice if the columns were fixed width.
michael@0: 
michael@0:   stream_ <<  '[';
michael@0:   if (log_process_id)
michael@0:     stream_ << CurrentProcessId() << ':';
michael@0:   if (log_thread_id)
michael@0:     stream_ << base::PlatformThread::CurrentId() << ':';
michael@0:   if (log_timestamp) {
michael@0:     time_t t = time(NULL);
michael@0:     struct tm local_time = {0};
michael@0: #if _MSC_VER >= 1400
michael@0:     localtime_s(&local_time, &t);
michael@0: #else
michael@0:     localtime_r(&t, &local_time);
michael@0: #endif
michael@0:     struct tm* tm_time = &local_time;
michael@0:     stream_ << std::setfill('0')
michael@0:             << std::setw(2) << 1 + tm_time->tm_mon
michael@0:             << std::setw(2) << tm_time->tm_mday
michael@0:             << '/'
michael@0:             << std::setw(2) << tm_time->tm_hour
michael@0:             << std::setw(2) << tm_time->tm_min
michael@0:             << std::setw(2) << tm_time->tm_sec
michael@0:             << ':';
michael@0:   }
michael@0:   if (log_tickcount)
michael@0:     stream_ << TickCount() << ':';
michael@0:   if (severity_ >= 0)
michael@0:     stream_ << log_severity_names[severity_];
michael@0:   else
michael@0:     stream_ << "VERBOSE" << -severity_;
michael@0: 
michael@0:   stream_ << ":" << filename << "(" << line << ")] ";
michael@0: 
michael@0:   message_start_ = stream_.tellp();
michael@0: }
michael@0: 
michael@0: #if defined(OS_WIN)
michael@0: // This has already been defined in the header, but defining it again as DWORD
michael@0: // ensures that the type used in the header is equivalent to DWORD. If not,
michael@0: // the redefinition is a compile error.
michael@0: typedef DWORD SystemErrorCode;
michael@0: #endif
michael@0: 
michael@0: SystemErrorCode GetLastSystemErrorCode() {
michael@0: #if defined(OS_WIN)
michael@0:   return ::GetLastError();
michael@0: #elif defined(OS_POSIX)
michael@0:   return errno;
michael@0: #else
michael@0: #error Not implemented
michael@0: #endif
michael@0: }
michael@0: 
michael@0: #if defined(OS_WIN)
michael@0: Win32ErrorLogMessage::Win32ErrorLogMessage(const char* file,
michael@0:                                            int line,
michael@0:                                            LogSeverity severity,
michael@0:                                            SystemErrorCode err,
michael@0:                                            const char* module)
michael@0:     : err_(err),
michael@0:       module_(module),
michael@0:       log_message_(file, line, severity) {
michael@0: }
michael@0: 
michael@0: Win32ErrorLogMessage::Win32ErrorLogMessage(const char* file,
michael@0:                                            int line,
michael@0:                                            LogSeverity severity,
michael@0:                                            SystemErrorCode err)
michael@0:     : err_(err),
michael@0:       module_(NULL),
michael@0:       log_message_(file, line, severity) {
michael@0: }
michael@0: 
michael@0: Win32ErrorLogMessage::~Win32ErrorLogMessage() {
michael@0:   const int error_message_buffer_size = 256;
michael@0:   char msgbuf[error_message_buffer_size];
michael@0:   DWORD flags = FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS;
michael@0:   HMODULE hmod;
michael@0:   if (module_) {
michael@0:     hmod = GetModuleHandleA(module_);
michael@0:     if (hmod) {
michael@0:       flags |= FORMAT_MESSAGE_FROM_HMODULE;
michael@0:     } else {
michael@0:       // This makes a nested Win32ErrorLogMessage. It will have module_ of NULL
michael@0:       // so it will not call GetModuleHandle, so recursive errors are
michael@0:       // impossible.
michael@0:       DPLOG(WARNING) << "Couldn't open module " << module_
michael@0:           << " for error message query";
michael@0:     }
michael@0:   } else {
michael@0:     hmod = NULL;
michael@0:   }
michael@0:   DWORD len = FormatMessageA(flags,
michael@0:                              hmod,
michael@0:                              err_,
michael@0:                              0,
michael@0:                              msgbuf,
michael@0:                              sizeof(msgbuf) / sizeof(msgbuf[0]),
michael@0:                              NULL);
michael@0:   if (len) {
michael@0:     while ((len > 0) &&
michael@0:            isspace(static_cast<unsigned char>(msgbuf[len - 1]))) {
michael@0:       msgbuf[--len] = 0;
michael@0:     }
michael@0:     stream() << ": " << msgbuf;
michael@0:   } else {
michael@0:     stream() << ": Error " << GetLastError() << " while retrieving error "
michael@0:         << err_;
michael@0:   }
michael@0:   // We're about to crash (CHECK). Put |err_| on the stack (by placing it in a
michael@0:   // field) and use Alias in hopes that it makes it into crash dumps.
michael@0:   DWORD last_error = err_;
michael@0:   base::debug::Alias(&last_error);
michael@0: }
michael@0: #elif defined(OS_POSIX)
michael@0: ErrnoLogMessage::ErrnoLogMessage(const char* file,
michael@0:                                  int line,
michael@0:                                  LogSeverity severity,
michael@0:                                  SystemErrorCode err)
michael@0:     : err_(err),
michael@0:       log_message_(file, line, severity) {
michael@0: }
michael@0: 
michael@0: ErrnoLogMessage::~ErrnoLogMessage() {
michael@0:   stream() << ": " << safe_strerror(err_);
michael@0: }
michael@0: #endif  // OS_WIN
michael@0: 
michael@0: void CloseLogFile() {
michael@0:   LoggingLock logging_lock;
michael@0:   CloseLogFileUnlocked();
michael@0: }
michael@0: 
michael@0: void RawLog(int level, const char* message) {
michael@0:   if (level >= min_log_level) {
michael@0:     size_t bytes_written = 0;
michael@0:     const size_t message_len = strlen(message);
michael@0:     int rv;
michael@0:     while (bytes_written < message_len) {
michael@0:       rv = HANDLE_EINTR(
michael@0:           write(STDERR_FILENO, message + bytes_written,
michael@0:                 message_len - bytes_written));
michael@0:       if (rv < 0) {
michael@0:         // Give up, nothing we can do now.
michael@0:         break;
michael@0:       }
michael@0:       bytes_written += rv;
michael@0:     }
michael@0: 
michael@0:     if (message_len > 0 && message[message_len - 1] != '\n') {
michael@0:       do {
michael@0:         rv = HANDLE_EINTR(write(STDERR_FILENO, "\n", 1));
michael@0:         if (rv < 0) {
michael@0:           // Give up, nothing we can do now.
michael@0:           break;
michael@0:         }
michael@0:       } while (rv != 1);
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   if (level == LOG_FATAL)
michael@0:     base::debug::BreakDebugger();
michael@0: }
michael@0: 
michael@0: // This was defined at the beginning of this file.
michael@0: #undef write
michael@0: 
michael@0: #if defined(OS_WIN)
michael@0: std::wstring GetLogFileFullPath() {
michael@0:   if (log_file_name)
michael@0:     return *log_file_name;
michael@0:   return std::wstring();
michael@0: }
michael@0: #endif
michael@0: 
michael@0: }  // namespace logging
michael@0: 
michael@0: std::ostream& operator<<(std::ostream& out, const wchar_t* wstr) {
michael@0:   return out << WideToUTF8(std::wstring(wstr));
michael@0: }