1023 lines
39 KiB
C++
1023 lines
39 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_LOGGING_H_
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#define BASE_LOGGING_H_
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#include <cassert>
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#include <string>
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#include <cstring>
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#include <sstream>
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#include "base/base_export.h"
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#include "base/basictypes.h"
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#include "base/debug/debugger.h"
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#include "build/build_config.h"
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//
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// Optional message capabilities
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// -----------------------------
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// Assertion failed messages and fatal errors are displayed in a dialog box
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// before the application exits. However, running this UI creates a message
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// loop, which causes application messages to be processed and potentially
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// dispatched to existing application windows. Since the application is in a
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// bad state when this assertion dialog is displayed, these messages may not
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// get processed and hang the dialog, or the application might go crazy.
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//
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// Therefore, it can be beneficial to display the error dialog in a separate
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// process from the main application. When the logging system needs to display
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// a fatal error dialog box, it will look for a program called
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// "DebugMessage.exe" in the same directory as the application executable. It
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// will run this application with the message as the command line, and will
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// not include the name of the application as is traditional for easier
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// parsing.
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//
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// The code for DebugMessage.exe is only one line. In WinMain, do:
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// MessageBox(NULL, GetCommandLineW(), L"Fatal Error", 0);
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//
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// If DebugMessage.exe is not found, the logging code will use a normal
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// MessageBox, potentially causing the problems discussed above.
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// Instructions
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// ------------
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//
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// Make a bunch of macros for logging. The way to log things is to stream
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// things to LOG(<a particular severity level>). E.g.,
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//
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// LOG(INFO) << "Found " << num_cookies << " cookies";
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//
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// You can also do conditional logging:
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//
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// LOG_IF(INFO, num_cookies > 10) << "Got lots of cookies";
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//
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// The above will cause log messages to be output on the 1st, 11th, 21st, ...
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// times it is executed. Note that the special COUNTER value is used to
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// identify which repetition is happening.
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//
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// The CHECK(condition) macro is active in both debug and release builds and
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// effectively performs a LOG(FATAL) which terminates the process and
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// generates a crashdump unless a debugger is attached.
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//
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// There are also "debug mode" logging macros like the ones above:
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//
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// DLOG(INFO) << "Found cookies";
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//
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// DLOG_IF(INFO, num_cookies > 10) << "Got lots of cookies";
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//
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// All "debug mode" logging is compiled away to nothing for non-debug mode
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// compiles. LOG_IF and development flags also work well together
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// because the code can be compiled away sometimes.
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//
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// We also have
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//
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// LOG_ASSERT(assertion);
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// DLOG_ASSERT(assertion);
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//
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// which is syntactic sugar for {,D}LOG_IF(FATAL, assert fails) << assertion;
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//
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// There are "verbose level" logging macros. They look like
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//
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// VLOG(1) << "I'm printed when you run the program with --v=1 or more";
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// VLOG(2) << "I'm printed when you run the program with --v=2 or more";
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//
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// These always log at the INFO log level (when they log at all).
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// The verbose logging can also be turned on module-by-module. For instance,
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// --vmodule=profile=2,icon_loader=1,browser_*=3,*/chromeos/*=4 --v=0
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// will cause:
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// a. VLOG(2) and lower messages to be printed from profile.{h,cc}
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// b. VLOG(1) and lower messages to be printed from icon_loader.{h,cc}
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// c. VLOG(3) and lower messages to be printed from files prefixed with
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// "browser"
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// d. VLOG(4) and lower messages to be printed from files under a
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// "chromeos" directory.
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// e. VLOG(0) and lower messages to be printed from elsewhere
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//
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// The wildcarding functionality shown by (c) supports both '*' (match
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// 0 or more characters) and '?' (match any single character)
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// wildcards. Any pattern containing a forward or backward slash will
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// be tested against the whole pathname and not just the module.
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// E.g., "*/foo/bar/*=2" would change the logging level for all code
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// in source files under a "foo/bar" directory.
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//
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// There's also VLOG_IS_ON(n) "verbose level" condition macro. To be used as
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//
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// if (VLOG_IS_ON(2)) {
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// // do some logging preparation and logging
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// // that can't be accomplished with just VLOG(2) << ...;
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// }
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//
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// There is also a VLOG_IF "verbose level" condition macro for sample
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// cases, when some extra computation and preparation for logs is not
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// needed.
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//
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// VLOG_IF(1, (size > 1024))
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// << "I'm printed when size is more than 1024 and when you run the "
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// "program with --v=1 or more";
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//
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// We also override the standard 'assert' to use 'DLOG_ASSERT'.
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//
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// Lastly, there is:
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//
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// PLOG(ERROR) << "Couldn't do foo";
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// DPLOG(ERROR) << "Couldn't do foo";
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// PLOG_IF(ERROR, cond) << "Couldn't do foo";
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// DPLOG_IF(ERROR, cond) << "Couldn't do foo";
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// PCHECK(condition) << "Couldn't do foo";
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// DPCHECK(condition) << "Couldn't do foo";
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//
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// which append the last system error to the message in string form (taken from
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// GetLastError() on Windows and errno on POSIX).
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//
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// The supported severity levels for macros that allow you to specify one
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// are (in increasing order of severity) INFO, WARNING, ERROR, ERROR_REPORT,
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// and FATAL.
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//
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// Very important: logging a message at the FATAL severity level causes
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// the program to terminate (after the message is logged).
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//
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// Note the special severity of ERROR_REPORT only available/relevant in normal
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// mode, which displays error dialog without terminating the program. There is
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// no error dialog for severity ERROR or below in normal mode.
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//
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// There is also the special severity of DFATAL, which logs FATAL in
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// debug mode, ERROR in normal mode.
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namespace logging {
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// TODO(avi): do we want to do a unification of character types here?
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#if defined(OS_WIN)
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typedef wchar_t PathChar;
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#else
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typedef char PathChar;
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#endif
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// Where to record logging output? A flat file and/or system debug log
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// via OutputDebugString.
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enum LoggingDestination {
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LOG_NONE = 0,
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LOG_TO_FILE = 1 << 0,
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LOG_TO_SYSTEM_DEBUG_LOG = 1 << 1,
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LOG_TO_ALL = LOG_TO_FILE | LOG_TO_SYSTEM_DEBUG_LOG,
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// On Windows, use a file next to the exe; on POSIX platforms, where
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// it may not even be possible to locate the executable on disk, use
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// stderr.
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#if defined(OS_WIN)
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LOG_DEFAULT = LOG_TO_FILE,
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#elif defined(OS_POSIX)
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LOG_DEFAULT = LOG_TO_SYSTEM_DEBUG_LOG,
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#endif
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};
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// Indicates that the log file should be locked when being written to.
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// Unless there is only one single-threaded process that is logging to
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// the log file, the file should be locked during writes to make each
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// log outut atomic. Other writers will block.
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//
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// All processes writing to the log file must have their locking set for it to
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// work properly. Defaults to LOCK_LOG_FILE.
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enum LogLockingState { LOCK_LOG_FILE, DONT_LOCK_LOG_FILE };
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// On startup, should we delete or append to an existing log file (if any)?
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// Defaults to APPEND_TO_OLD_LOG_FILE.
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enum OldFileDeletionState { DELETE_OLD_LOG_FILE, APPEND_TO_OLD_LOG_FILE };
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enum DcheckState {
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DISABLE_DCHECK_FOR_NON_OFFICIAL_RELEASE_BUILDS,
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ENABLE_DCHECK_FOR_NON_OFFICIAL_RELEASE_BUILDS
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};
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struct BASE_EXPORT LoggingSettings {
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// The defaults values are:
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//
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// logging_dest: LOG_DEFAULT
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// log_file: NULL
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// lock_log: LOCK_LOG_FILE
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// delete_old: APPEND_TO_OLD_LOG_FILE
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// dcheck_state: DISABLE_DCHECK_FOR_NON_OFFICIAL_RELEASE_BUILDS
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LoggingSettings();
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LoggingDestination logging_dest;
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// The three settings below have an effect only when LOG_TO_FILE is
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// set in |logging_dest|.
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const PathChar* log_file;
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LogLockingState lock_log;
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OldFileDeletionState delete_old;
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DcheckState dcheck_state;
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};
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// Define different names for the BaseInitLoggingImpl() function depending on
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// whether NDEBUG is defined or not so that we'll fail to link if someone tries
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// to compile logging.cc with NDEBUG but includes logging.h without defining it,
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// or vice versa.
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#if NDEBUG
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#define BaseInitLoggingImpl BaseInitLoggingImpl_built_with_NDEBUG
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#else
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#define BaseInitLoggingImpl BaseInitLoggingImpl_built_without_NDEBUG
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#endif
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// Implementation of the InitLogging() method declared below. We use a
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// more-specific name so we can #define it above without affecting other code
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// that has named stuff "InitLogging".
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BASE_EXPORT bool BaseInitLoggingImpl(const LoggingSettings& settings);
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// Sets the log file name and other global logging state. Calling this function
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// is recommended, and is normally done at the beginning of application init.
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// If you don't call it, all the flags will be initialized to their default
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// values, and there is a race condition that may leak a critical section
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// object if two threads try to do the first log at the same time.
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// See the definition of the enums above for descriptions and default values.
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//
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// The default log file is initialized to "debug.log" in the application
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// directory. You probably don't want this, especially since the program
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// directory may not be writable on an enduser's system.
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//
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// This function may be called a second time to re-direct logging (e.g after
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// loging in to a user partition), however it should never be called more than
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// twice.
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inline bool InitLogging(const LoggingSettings& settings) {
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return BaseInitLoggingImpl(settings);
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}
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// Sets the log level. Anything at or above this level will be written to the
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// log file/displayed to the user (if applicable). Anything below this level
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// will be silently ignored. The log level defaults to 0 (everything is logged
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// up to level INFO) if this function is not called.
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// Note that log messages for VLOG(x) are logged at level -x, so setting
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// the min log level to negative values enables verbose logging.
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BASE_EXPORT void SetMinLogLevel(int level);
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// Gets the current log level.
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BASE_EXPORT int GetMinLogLevel();
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// Gets the VLOG default verbosity level.
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BASE_EXPORT int GetVlogVerbosity();
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// Gets the current vlog level for the given file (usually taken from
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// __FILE__).
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// Note that |N| is the size *with* the null terminator.
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BASE_EXPORT int GetVlogLevelHelper(const char* file_start, size_t N);
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template <size_t N>
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int GetVlogLevel(const char (&file)[N]) {
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return GetVlogLevelHelper(file, N);
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}
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// Sets the common items you want to be prepended to each log message.
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// process and thread IDs default to off, the timestamp defaults to on.
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// If this function is not called, logging defaults to writing the timestamp
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// only.
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BASE_EXPORT void SetLogItems(bool enable_process_id, bool enable_thread_id,
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bool enable_timestamp, bool enable_tickcount);
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// Sets whether or not you'd like to see fatal debug messages popped up in
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// a dialog box or not.
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// Dialogs are not shown by default.
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BASE_EXPORT void SetShowErrorDialogs(bool enable_dialogs);
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// Sets the Log Assert Handler that will be used to notify of check failures.
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// The default handler shows a dialog box and then terminate the process,
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// however clients can use this function to override with their own handling
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// (e.g. a silent one for Unit Tests)
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typedef void (*LogAssertHandlerFunction)(const std::string& str);
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BASE_EXPORT void SetLogAssertHandler(LogAssertHandlerFunction handler);
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// Sets the Log Report Handler that will be used to notify of check failures
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// in non-debug mode. The default handler shows a dialog box and continues
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// the execution, however clients can use this function to override with their
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// own handling.
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typedef void (*LogReportHandlerFunction)(const std::string& str);
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BASE_EXPORT void SetLogReportHandler(LogReportHandlerFunction handler);
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// Sets the Log Message Handler that gets passed every log message before
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// it's sent to other log destinations (if any).
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// Returns true to signal that it handled the message and the message
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// should not be sent to other log destinations.
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typedef bool (*LogMessageHandlerFunction)(int severity,
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const char* file, int line, size_t message_start, const std::string& str);
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BASE_EXPORT void SetLogMessageHandler(LogMessageHandlerFunction handler);
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BASE_EXPORT LogMessageHandlerFunction GetLogMessageHandler();
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typedef int LogSeverity;
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const LogSeverity LOG_VERBOSE = -1; // This is level 1 verbosity
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// Note: the log severities are used to index into the array of names,
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// see log_severity_names.
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const LogSeverity LOG_INFO = 0;
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const LogSeverity LOG_WARNING = 1;
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const LogSeverity LOG_ERROR = 2;
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const LogSeverity LOG_ERROR_REPORT = 3;
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const LogSeverity LOG_FATAL = 4;
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const LogSeverity LOG_NUM_SEVERITIES = 5;
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// LOG_DFATAL is LOG_FATAL in debug mode, ERROR in normal mode
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#ifdef NDEBUG
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const LogSeverity LOG_DFATAL = LOG_ERROR;
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#else
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const LogSeverity LOG_DFATAL = LOG_FATAL;
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#endif
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// A few definitions of macros that don't generate much code. These are used
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// by LOG() and LOG_IF, etc. Since these are used all over our code, it's
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// better to have compact code for these operations.
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#define COMPACT_GOOGLE_LOG_EX_INFO(ClassName, ...) \
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logging::ClassName(__FILE__, __LINE__, logging::LOG_INFO , ##__VA_ARGS__)
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#define COMPACT_GOOGLE_LOG_EX_WARNING(ClassName, ...) \
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logging::ClassName(__FILE__, __LINE__, logging::LOG_WARNING , ##__VA_ARGS__)
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#define COMPACT_GOOGLE_LOG_EX_ERROR(ClassName, ...) \
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logging::ClassName(__FILE__, __LINE__, logging::LOG_ERROR , ##__VA_ARGS__)
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#define COMPACT_GOOGLE_LOG_EX_ERROR_REPORT(ClassName, ...) \
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logging::ClassName(__FILE__, __LINE__, \
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logging::LOG_ERROR_REPORT , ##__VA_ARGS__)
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#define COMPACT_GOOGLE_LOG_EX_FATAL(ClassName, ...) \
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logging::ClassName(__FILE__, __LINE__, logging::LOG_FATAL , ##__VA_ARGS__)
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#define COMPACT_GOOGLE_LOG_EX_DFATAL(ClassName, ...) \
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logging::ClassName(__FILE__, __LINE__, logging::LOG_DFATAL , ##__VA_ARGS__)
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#define COMPACT_GOOGLE_LOG_INFO \
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COMPACT_GOOGLE_LOG_EX_INFO(LogMessage)
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#define COMPACT_GOOGLE_LOG_WARNING \
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COMPACT_GOOGLE_LOG_EX_WARNING(LogMessage)
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#define COMPACT_GOOGLE_LOG_ERROR \
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COMPACT_GOOGLE_LOG_EX_ERROR(LogMessage)
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#define COMPACT_GOOGLE_LOG_ERROR_REPORT \
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COMPACT_GOOGLE_LOG_EX_ERROR_REPORT(LogMessage)
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#define COMPACT_GOOGLE_LOG_FATAL \
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COMPACT_GOOGLE_LOG_EX_FATAL(LogMessage)
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#define COMPACT_GOOGLE_LOG_DFATAL \
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COMPACT_GOOGLE_LOG_EX_DFATAL(LogMessage)
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#if defined(OS_WIN)
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// wingdi.h defines ERROR to be 0. When we call LOG(ERROR), it gets
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// substituted with 0, and it expands to COMPACT_GOOGLE_LOG_0. To allow us
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// to keep using this syntax, we define this macro to do the same thing
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// as COMPACT_GOOGLE_LOG_ERROR, and also define ERROR the same way that
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// the Windows SDK does for consistency.
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#define ERROR 0
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#define COMPACT_GOOGLE_LOG_EX_0(ClassName, ...) \
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COMPACT_GOOGLE_LOG_EX_ERROR(ClassName , ##__VA_ARGS__)
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#define COMPACT_GOOGLE_LOG_0 COMPACT_GOOGLE_LOG_ERROR
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// Needed for LOG_IS_ON(ERROR).
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const LogSeverity LOG_0 = LOG_ERROR;
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#endif
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// As special cases, we can assume that LOG_IS_ON(ERROR_REPORT) and
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// LOG_IS_ON(FATAL) always hold. Also, LOG_IS_ON(DFATAL) always holds
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// in debug mode. In particular, CHECK()s will always fire if they
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// fail.
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#define LOG_IS_ON(severity) \
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((::logging::LOG_ ## severity) >= ::logging::GetMinLogLevel())
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// We can't do any caching tricks with VLOG_IS_ON() like the
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// google-glog version since it requires GCC extensions. This means
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// that using the v-logging functions in conjunction with --vmodule
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// may be slow.
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#define VLOG_IS_ON(verboselevel) \
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((verboselevel) <= ::logging::GetVlogLevel(__FILE__))
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// Helper macro which avoids evaluating the arguments to a stream if
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// the condition doesn't hold.
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#define LAZY_STREAM(stream, condition) \
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!(condition) ? (void) 0 : ::logging::LogMessageVoidify() & (stream)
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// We use the preprocessor's merging operator, "##", so that, e.g.,
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// LOG(INFO) becomes the token COMPACT_GOOGLE_LOG_INFO. There's some funny
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// subtle difference between ostream member streaming functions (e.g.,
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// ostream::operator<<(int) and ostream non-member streaming functions
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// (e.g., ::operator<<(ostream&, string&): it turns out that it's
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// impossible to stream something like a string directly to an unnamed
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// ostream. We employ a neat hack by calling the stream() member
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// function of LogMessage which seems to avoid the problem.
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#define LOG_STREAM(severity) COMPACT_GOOGLE_LOG_ ## severity.stream()
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#define LOG(severity) LAZY_STREAM(LOG_STREAM(severity), LOG_IS_ON(severity))
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#define LOG_IF(severity, condition) \
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LAZY_STREAM(LOG_STREAM(severity), LOG_IS_ON(severity) && (condition))
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#define SYSLOG(severity) LOG(severity)
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#define SYSLOG_IF(severity, condition) LOG_IF(severity, condition)
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// The VLOG macros log with negative verbosities.
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#define VLOG_STREAM(verbose_level) \
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logging::LogMessage(__FILE__, __LINE__, -verbose_level).stream()
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#define VLOG(verbose_level) \
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LAZY_STREAM(VLOG_STREAM(verbose_level), VLOG_IS_ON(verbose_level))
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#define VLOG_IF(verbose_level, condition) \
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LAZY_STREAM(VLOG_STREAM(verbose_level), \
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VLOG_IS_ON(verbose_level) && (condition))
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#if defined (OS_WIN)
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#define VPLOG_STREAM(verbose_level) \
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logging::Win32ErrorLogMessage(__FILE__, __LINE__, -verbose_level, \
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::logging::GetLastSystemErrorCode()).stream()
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#elif defined(OS_POSIX)
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#define VPLOG_STREAM(verbose_level) \
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logging::ErrnoLogMessage(__FILE__, __LINE__, -verbose_level, \
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::logging::GetLastSystemErrorCode()).stream()
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#endif
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#define VPLOG(verbose_level) \
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LAZY_STREAM(VPLOG_STREAM(verbose_level), VLOG_IS_ON(verbose_level))
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#define VPLOG_IF(verbose_level, condition) \
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LAZY_STREAM(VPLOG_STREAM(verbose_level), \
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VLOG_IS_ON(verbose_level) && (condition))
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// TODO(akalin): Add more VLOG variants, e.g. VPLOG.
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#define LOG_ASSERT(condition) \
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LOG_IF(FATAL, !(condition)) << "Assert failed: " #condition ". "
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|
#define SYSLOG_ASSERT(condition) \
|
|
SYSLOG_IF(FATAL, !(condition)) << "Assert failed: " #condition ". "
|
|
|
|
#if defined(OS_WIN)
|
|
#define LOG_GETLASTERROR_STREAM(severity) \
|
|
COMPACT_GOOGLE_LOG_EX_ ## severity(Win32ErrorLogMessage, \
|
|
::logging::GetLastSystemErrorCode()).stream()
|
|
#define LOG_GETLASTERROR(severity) \
|
|
LAZY_STREAM(LOG_GETLASTERROR_STREAM(severity), LOG_IS_ON(severity))
|
|
#define LOG_GETLASTERROR_MODULE_STREAM(severity, module) \
|
|
COMPACT_GOOGLE_LOG_EX_ ## severity(Win32ErrorLogMessage, \
|
|
::logging::GetLastSystemErrorCode(), module).stream()
|
|
#define LOG_GETLASTERROR_MODULE(severity, module) \
|
|
LAZY_STREAM(LOG_GETLASTERROR_STREAM(severity, module), \
|
|
LOG_IS_ON(severity))
|
|
// PLOG_STREAM is used by PLOG, which is the usual error logging macro
|
|
// for each platform.
|
|
#define PLOG_STREAM(severity) LOG_GETLASTERROR_STREAM(severity)
|
|
#elif defined(OS_POSIX)
|
|
#define LOG_ERRNO_STREAM(severity) \
|
|
COMPACT_GOOGLE_LOG_EX_ ## severity(ErrnoLogMessage, \
|
|
::logging::GetLastSystemErrorCode()).stream()
|
|
#define LOG_ERRNO(severity) \
|
|
LAZY_STREAM(LOG_ERRNO_STREAM(severity), LOG_IS_ON(severity))
|
|
// PLOG_STREAM is used by PLOG, which is the usual error logging macro
|
|
// for each platform.
|
|
#define PLOG_STREAM(severity) LOG_ERRNO_STREAM(severity)
|
|
#endif
|
|
|
|
#define PLOG(severity) \
|
|
LAZY_STREAM(PLOG_STREAM(severity), LOG_IS_ON(severity))
|
|
|
|
#define PLOG_IF(severity, condition) \
|
|
LAZY_STREAM(PLOG_STREAM(severity), LOG_IS_ON(severity) && (condition))
|
|
|
|
#if !defined(NDEBUG)
|
|
// Debug builds always include DCHECK and DLOG.
|
|
#undef LOGGING_IS_OFFICIAL_BUILD
|
|
#define LOGGING_IS_OFFICIAL_BUILD 0
|
|
#elif defined(OFFICIAL_BUILD)
|
|
// Official release builds always disable and remove DCHECK and DLOG.
|
|
#undef LOGGING_IS_OFFICIAL_BUILD
|
|
#define LOGGING_IS_OFFICIAL_BUILD 1
|
|
#elif !defined(LOGGING_IS_OFFICIAL_BUILD)
|
|
// Unless otherwise specified, unofficial release builds include
|
|
// DCHECK and DLOG.
|
|
#define LOGGING_IS_OFFICIAL_BUILD 0
|
|
#endif
|
|
|
|
// The actual stream used isn't important.
|
|
#define EAT_STREAM_PARAMETERS \
|
|
true ? (void) 0 : ::logging::LogMessageVoidify() & LOG_STREAM(FATAL)
|
|
|
|
// CHECK dies with a fatal error if condition is not true. It is *not*
|
|
// controlled by NDEBUG, so the check will be executed regardless of
|
|
// compilation mode.
|
|
//
|
|
// We make sure CHECK et al. always evaluates their arguments, as
|
|
// doing CHECK(FunctionWithSideEffect()) is a common idiom.
|
|
|
|
#if LOGGING_IS_OFFICIAL_BUILD
|
|
|
|
// Make all CHECK functions discard their log strings to reduce code
|
|
// bloat for official builds.
|
|
|
|
// TODO(akalin): This would be more valuable if there were some way to
|
|
// remove BreakDebugger() from the backtrace, perhaps by turning it
|
|
// into a macro (like __debugbreak() on Windows).
|
|
#define CHECK(condition) \
|
|
!(condition) ? ::base::debug::BreakDebugger() : EAT_STREAM_PARAMETERS
|
|
|
|
#define PCHECK(condition) CHECK(condition)
|
|
|
|
#define CHECK_OP(name, op, val1, val2) CHECK((val1) op (val2))
|
|
|
|
#else
|
|
|
|
#define CHECK(condition) \
|
|
LAZY_STREAM(LOG_STREAM(FATAL), !(condition)) \
|
|
<< "Check failed: " #condition ". "
|
|
|
|
#define PCHECK(condition) \
|
|
LAZY_STREAM(PLOG_STREAM(FATAL), !(condition)) \
|
|
<< "Check failed: " #condition ". "
|
|
|
|
// Helper macro for binary operators.
|
|
// Don't use this macro directly in your code, use CHECK_EQ et al below.
|
|
//
|
|
// TODO(akalin): Rewrite this so that constructs like if (...)
|
|
// CHECK_EQ(...) else { ... } work properly.
|
|
#define CHECK_OP(name, op, val1, val2) \
|
|
if (std::string* _result = \
|
|
logging::Check##name##Impl((val1), (val2), \
|
|
#val1 " " #op " " #val2)) \
|
|
logging::LogMessage(__FILE__, __LINE__, _result).stream()
|
|
|
|
#endif
|
|
|
|
// Build the error message string. This is separate from the "Impl"
|
|
// function template because it is not performance critical and so can
|
|
// be out of line, while the "Impl" code should be inline. Caller
|
|
// takes ownership of the returned string.
|
|
template<class t1, class t2>
|
|
std::string* MakeCheckOpString(const t1& v1, const t2& v2, const char* names) {
|
|
std::ostringstream ss;
|
|
ss << names << " (" << v1 << " vs. " << v2 << ")";
|
|
std::string* msg = new std::string(ss.str());
|
|
return msg;
|
|
}
|
|
|
|
// MSVC doesn't like complex extern templates and DLLs.
|
|
#if !defined(COMPILER_MSVC)
|
|
// Commonly used instantiations of MakeCheckOpString<>. Explicitly instantiated
|
|
// in logging.cc.
|
|
extern template BASE_EXPORT std::string* MakeCheckOpString<int, int>(
|
|
const int&, const int&, const char* names);
|
|
extern template BASE_EXPORT
|
|
std::string* MakeCheckOpString<unsigned long, unsigned long>(
|
|
const unsigned long&, const unsigned long&, const char* names);
|
|
extern template BASE_EXPORT
|
|
std::string* MakeCheckOpString<unsigned long, unsigned int>(
|
|
const unsigned long&, const unsigned int&, const char* names);
|
|
extern template BASE_EXPORT
|
|
std::string* MakeCheckOpString<unsigned int, unsigned long>(
|
|
const unsigned int&, const unsigned long&, const char* names);
|
|
extern template BASE_EXPORT
|
|
std::string* MakeCheckOpString<std::string, std::string>(
|
|
const std::string&, const std::string&, const char* name);
|
|
#endif
|
|
|
|
// Helper functions for CHECK_OP macro.
|
|
// The (int, int) specialization works around the issue that the compiler
|
|
// will not instantiate the template version of the function on values of
|
|
// unnamed enum type - see comment below.
|
|
#define DEFINE_CHECK_OP_IMPL(name, op) \
|
|
template <class t1, class t2> \
|
|
inline std::string* Check##name##Impl(const t1& v1, const t2& v2, \
|
|
const char* names) { \
|
|
if (v1 op v2) return NULL; \
|
|
else return MakeCheckOpString(v1, v2, names); \
|
|
} \
|
|
inline std::string* Check##name##Impl(int v1, int v2, const char* names) { \
|
|
if (v1 op v2) return NULL; \
|
|
else return MakeCheckOpString(v1, v2, names); \
|
|
}
|
|
DEFINE_CHECK_OP_IMPL(EQ, ==)
|
|
DEFINE_CHECK_OP_IMPL(NE, !=)
|
|
DEFINE_CHECK_OP_IMPL(LE, <=)
|
|
DEFINE_CHECK_OP_IMPL(LT, < )
|
|
DEFINE_CHECK_OP_IMPL(GE, >=)
|
|
DEFINE_CHECK_OP_IMPL(GT, > )
|
|
#undef DEFINE_CHECK_OP_IMPL
|
|
|
|
#define CHECK_EQ(val1, val2) CHECK_OP(EQ, ==, val1, val2)
|
|
#define CHECK_NE(val1, val2) CHECK_OP(NE, !=, val1, val2)
|
|
#define CHECK_LE(val1, val2) CHECK_OP(LE, <=, val1, val2)
|
|
#define CHECK_LT(val1, val2) CHECK_OP(LT, < , val1, val2)
|
|
#define CHECK_GE(val1, val2) CHECK_OP(GE, >=, val1, val2)
|
|
#define CHECK_GT(val1, val2) CHECK_OP(GT, > , val1, val2)
|
|
|
|
#if LOGGING_IS_OFFICIAL_BUILD
|
|
// In order to have optimized code for official builds, remove DLOGs and
|
|
// DCHECKs.
|
|
#define ENABLE_DLOG 0
|
|
#define ENABLE_DCHECK 0
|
|
|
|
#elif defined(NDEBUG)
|
|
// Otherwise, if we're a release build, remove DLOGs but not DCHECKs
|
|
// (since those can still be turned on via a command-line flag).
|
|
#define ENABLE_DLOG 0
|
|
#define ENABLE_DCHECK 1
|
|
|
|
#else
|
|
// Otherwise, we're a debug build so enable DLOGs and DCHECKs.
|
|
#define ENABLE_DLOG 1
|
|
#define ENABLE_DCHECK 1
|
|
#endif
|
|
|
|
// Definitions for DLOG et al.
|
|
|
|
#if ENABLE_DLOG
|
|
|
|
#define DLOG_IS_ON(severity) LOG_IS_ON(severity)
|
|
#define DLOG_IF(severity, condition) LOG_IF(severity, condition)
|
|
#define DLOG_ASSERT(condition) LOG_ASSERT(condition)
|
|
#define DPLOG_IF(severity, condition) PLOG_IF(severity, condition)
|
|
#define DVLOG_IF(verboselevel, condition) VLOG_IF(verboselevel, condition)
|
|
#define DVPLOG_IF(verboselevel, condition) VPLOG_IF(verboselevel, condition)
|
|
|
|
#else // ENABLE_DLOG
|
|
|
|
// If ENABLE_DLOG is off, we want to avoid emitting any references to
|
|
// |condition| (which may reference a variable defined only if NDEBUG
|
|
// is not defined). Contrast this with DCHECK et al., which has
|
|
// different behavior.
|
|
|
|
#define DLOG_IS_ON(severity) false
|
|
#define DLOG_IF(severity, condition) EAT_STREAM_PARAMETERS
|
|
#define DLOG_ASSERT(condition) EAT_STREAM_PARAMETERS
|
|
#define DPLOG_IF(severity, condition) EAT_STREAM_PARAMETERS
|
|
#define DVLOG_IF(verboselevel, condition) EAT_STREAM_PARAMETERS
|
|
#define DVPLOG_IF(verboselevel, condition) EAT_STREAM_PARAMETERS
|
|
|
|
#endif // ENABLE_DLOG
|
|
|
|
// DEBUG_MODE is for uses like
|
|
// if (DEBUG_MODE) foo.CheckThatFoo();
|
|
// instead of
|
|
// #ifndef NDEBUG
|
|
// foo.CheckThatFoo();
|
|
// #endif
|
|
//
|
|
// We tie its state to ENABLE_DLOG.
|
|
enum { DEBUG_MODE = ENABLE_DLOG };
|
|
|
|
#undef ENABLE_DLOG
|
|
|
|
#define DLOG(severity) \
|
|
LAZY_STREAM(LOG_STREAM(severity), DLOG_IS_ON(severity))
|
|
|
|
#if defined(OS_WIN)
|
|
#define DLOG_GETLASTERROR(severity) \
|
|
LAZY_STREAM(LOG_GETLASTERROR_STREAM(severity), DLOG_IS_ON(severity))
|
|
#define DLOG_GETLASTERROR_MODULE(severity, module) \
|
|
LAZY_STREAM(LOG_GETLASTERROR_STREAM(severity, module), \
|
|
DLOG_IS_ON(severity))
|
|
#elif defined(OS_POSIX)
|
|
#define DLOG_ERRNO(severity) \
|
|
LAZY_STREAM(LOG_ERRNO_STREAM(severity), DLOG_IS_ON(severity))
|
|
#endif
|
|
|
|
#define DPLOG(severity) \
|
|
LAZY_STREAM(PLOG_STREAM(severity), DLOG_IS_ON(severity))
|
|
|
|
#define DVLOG(verboselevel) DVLOG_IF(verboselevel, VLOG_IS_ON(verboselevel))
|
|
|
|
#define DVPLOG(verboselevel) DVPLOG_IF(verboselevel, VLOG_IS_ON(verboselevel))
|
|
|
|
// Definitions for DCHECK et al.
|
|
|
|
#if ENABLE_DCHECK
|
|
|
|
#if defined(NDEBUG)
|
|
|
|
BASE_EXPORT DcheckState get_dcheck_state();
|
|
BASE_EXPORT void set_dcheck_state(DcheckState state);
|
|
|
|
#if defined(DCHECK_ALWAYS_ON)
|
|
|
|
#define DCHECK_IS_ON() true
|
|
#define COMPACT_GOOGLE_LOG_EX_DCHECK(ClassName, ...) \
|
|
COMPACT_GOOGLE_LOG_EX_FATAL(ClassName , ##__VA_ARGS__)
|
|
#define COMPACT_GOOGLE_LOG_DCHECK COMPACT_GOOGLE_LOG_FATAL
|
|
const LogSeverity LOG_DCHECK = LOG_FATAL;
|
|
|
|
#else
|
|
|
|
#define COMPACT_GOOGLE_LOG_EX_DCHECK(ClassName, ...) \
|
|
COMPACT_GOOGLE_LOG_EX_ERROR_REPORT(ClassName , ##__VA_ARGS__)
|
|
#define COMPACT_GOOGLE_LOG_DCHECK COMPACT_GOOGLE_LOG_ERROR_REPORT
|
|
const LogSeverity LOG_DCHECK = LOG_ERROR_REPORT;
|
|
#define DCHECK_IS_ON() \
|
|
((::logging::get_dcheck_state() == \
|
|
::logging::ENABLE_DCHECK_FOR_NON_OFFICIAL_RELEASE_BUILDS) && \
|
|
LOG_IS_ON(DCHECK))
|
|
|
|
#endif // defined(DCHECK_ALWAYS_ON)
|
|
|
|
#else // defined(NDEBUG)
|
|
|
|
// On a regular debug build, we want to have DCHECKs enabled.
|
|
#define COMPACT_GOOGLE_LOG_EX_DCHECK(ClassName, ...) \
|
|
COMPACT_GOOGLE_LOG_EX_FATAL(ClassName , ##__VA_ARGS__)
|
|
#define COMPACT_GOOGLE_LOG_DCHECK COMPACT_GOOGLE_LOG_FATAL
|
|
const LogSeverity LOG_DCHECK = LOG_FATAL;
|
|
#define DCHECK_IS_ON() true
|
|
|
|
#endif // defined(NDEBUG)
|
|
|
|
#else // ENABLE_DCHECK
|
|
|
|
// These are just dummy values since DCHECK_IS_ON() is always false in
|
|
// this case.
|
|
#define COMPACT_GOOGLE_LOG_EX_DCHECK(ClassName, ...) \
|
|
COMPACT_GOOGLE_LOG_EX_INFO(ClassName , ##__VA_ARGS__)
|
|
#define COMPACT_GOOGLE_LOG_DCHECK COMPACT_GOOGLE_LOG_INFO
|
|
const LogSeverity LOG_DCHECK = LOG_INFO;
|
|
#define DCHECK_IS_ON() false
|
|
|
|
#endif // ENABLE_DCHECK
|
|
#undef ENABLE_DCHECK
|
|
|
|
// DCHECK et al. make sure to reference |condition| regardless of
|
|
// whether DCHECKs are enabled; this is so that we don't get unused
|
|
// variable warnings if the only use of a variable is in a DCHECK.
|
|
// This behavior is different from DLOG_IF et al.
|
|
|
|
#define DCHECK(condition) \
|
|
LAZY_STREAM(LOG_STREAM(DCHECK), DCHECK_IS_ON() && !(condition)) \
|
|
<< "Check failed: " #condition ". "
|
|
|
|
#define DPCHECK(condition) \
|
|
LAZY_STREAM(PLOG_STREAM(DCHECK), DCHECK_IS_ON() && !(condition)) \
|
|
<< "Check failed: " #condition ". "
|
|
|
|
// Helper macro for binary operators.
|
|
// Don't use this macro directly in your code, use DCHECK_EQ et al below.
|
|
#define DCHECK_OP(name, op, val1, val2) \
|
|
if (DCHECK_IS_ON()) \
|
|
if (std::string* _result = \
|
|
logging::Check##name##Impl((val1), (val2), \
|
|
#val1 " " #op " " #val2)) \
|
|
logging::LogMessage( \
|
|
__FILE__, __LINE__, ::logging::LOG_DCHECK, \
|
|
_result).stream()
|
|
|
|
// Equality/Inequality checks - compare two values, and log a
|
|
// LOG_DCHECK message including the two values when the result is not
|
|
// as expected. The values must have operator<<(ostream, ...)
|
|
// defined.
|
|
//
|
|
// You may append to the error message like so:
|
|
// DCHECK_NE(1, 2) << ": The world must be ending!";
|
|
//
|
|
// We are very careful to ensure that each argument is evaluated exactly
|
|
// once, and that anything which is legal to pass as a function argument is
|
|
// legal here. In particular, the arguments may be temporary expressions
|
|
// which will end up being destroyed at the end of the apparent statement,
|
|
// for example:
|
|
// DCHECK_EQ(string("abc")[1], 'b');
|
|
//
|
|
// WARNING: These may not compile correctly if one of the arguments is a pointer
|
|
// and the other is NULL. To work around this, simply static_cast NULL to the
|
|
// type of the desired pointer.
|
|
|
|
#define DCHECK_EQ(val1, val2) DCHECK_OP(EQ, ==, val1, val2)
|
|
#define DCHECK_NE(val1, val2) DCHECK_OP(NE, !=, val1, val2)
|
|
#define DCHECK_LE(val1, val2) DCHECK_OP(LE, <=, val1, val2)
|
|
#define DCHECK_LT(val1, val2) DCHECK_OP(LT, < , val1, val2)
|
|
#define DCHECK_GE(val1, val2) DCHECK_OP(GE, >=, val1, val2)
|
|
#define DCHECK_GT(val1, val2) DCHECK_OP(GT, > , val1, val2)
|
|
|
|
#define NOTREACHED() DCHECK(false)
|
|
|
|
// Redefine the standard assert to use our nice log files
|
|
#undef assert
|
|
#define assert(x) DLOG_ASSERT(x)
|
|
|
|
// This class more or less represents a particular log message. You
|
|
// create an instance of LogMessage and then stream stuff to it.
|
|
// When you finish streaming to it, ~LogMessage is called and the
|
|
// full message gets streamed to the appropriate destination.
|
|
//
|
|
// You shouldn't actually use LogMessage's constructor to log things,
|
|
// though. You should use the LOG() macro (and variants thereof)
|
|
// above.
|
|
class BASE_EXPORT LogMessage {
|
|
public:
|
|
LogMessage(const char* file, int line, LogSeverity severity, int ctr);
|
|
|
|
// Two special constructors that generate reduced amounts of code at
|
|
// LOG call sites for common cases.
|
|
//
|
|
// Used for LOG(INFO): Implied are:
|
|
// severity = LOG_INFO, ctr = 0
|
|
//
|
|
// Using this constructor instead of the more complex constructor above
|
|
// saves a couple of bytes per call site.
|
|
LogMessage(const char* file, int line);
|
|
|
|
// Used for LOG(severity) where severity != INFO. Implied
|
|
// are: ctr = 0
|
|
//
|
|
// Using this constructor instead of the more complex constructor above
|
|
// saves a couple of bytes per call site.
|
|
LogMessage(const char* file, int line, LogSeverity severity);
|
|
|
|
// A special constructor used for check failures. Takes ownership
|
|
// of the given string.
|
|
// Implied severity = LOG_FATAL
|
|
LogMessage(const char* file, int line, std::string* result);
|
|
|
|
// A special constructor used for check failures, with the option to
|
|
// specify severity. Takes ownership of the given string.
|
|
LogMessage(const char* file, int line, LogSeverity severity,
|
|
std::string* result);
|
|
|
|
~LogMessage();
|
|
|
|
std::ostream& stream() { return stream_; }
|
|
|
|
private:
|
|
void Init(const char* file, int line);
|
|
|
|
LogSeverity severity_;
|
|
std::ostringstream stream_;
|
|
size_t message_start_; // Offset of the start of the message (past prefix
|
|
// info).
|
|
// The file and line information passed in to the constructor.
|
|
const char* file_;
|
|
const int line_;
|
|
|
|
#if defined(OS_WIN)
|
|
// Stores the current value of GetLastError in the constructor and restores
|
|
// it in the destructor by calling SetLastError.
|
|
// This is useful since the LogMessage class uses a lot of Win32 calls
|
|
// that will lose the value of GLE and the code that called the log function
|
|
// will have lost the thread error value when the log call returns.
|
|
class SaveLastError {
|
|
public:
|
|
SaveLastError();
|
|
~SaveLastError();
|
|
|
|
unsigned long get_error() const { return last_error_; }
|
|
|
|
protected:
|
|
unsigned long last_error_;
|
|
};
|
|
|
|
SaveLastError last_error_;
|
|
#endif
|
|
|
|
DISALLOW_COPY_AND_ASSIGN(LogMessage);
|
|
};
|
|
|
|
// A non-macro interface to the log facility; (useful
|
|
// when the logging level is not a compile-time constant).
|
|
inline void LogAtLevel(int const log_level, std::string const &msg) {
|
|
LogMessage(__FILE__, __LINE__, log_level).stream() << msg;
|
|
}
|
|
|
|
// This class is used to explicitly ignore values in the conditional
|
|
// logging macros. This avoids compiler warnings like "value computed
|
|
// is not used" and "statement has no effect".
|
|
class LogMessageVoidify {
|
|
public:
|
|
LogMessageVoidify() { }
|
|
// This has to be an operator with a precedence lower than << but
|
|
// higher than ?:
|
|
void operator&(std::ostream&) { }
|
|
};
|
|
|
|
#if defined(OS_WIN)
|
|
typedef unsigned long SystemErrorCode;
|
|
#elif defined(OS_POSIX)
|
|
typedef int SystemErrorCode;
|
|
#endif
|
|
|
|
// Alias for ::GetLastError() on Windows and errno on POSIX. Avoids having to
|
|
// pull in windows.h just for GetLastError() and DWORD.
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BASE_EXPORT SystemErrorCode GetLastSystemErrorCode();
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#if defined(OS_WIN)
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// Appends a formatted system message of the GetLastError() type.
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class BASE_EXPORT Win32ErrorLogMessage {
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public:
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Win32ErrorLogMessage(const char* file,
|
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int line,
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LogSeverity severity,
|
|
SystemErrorCode err,
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const char* module);
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|
|
Win32ErrorLogMessage(const char* file,
|
|
int line,
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|
LogSeverity severity,
|
|
SystemErrorCode err);
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|
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// Appends the error message before destructing the encapsulated class.
|
|
~Win32ErrorLogMessage();
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|
|
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std::ostream& stream() { return log_message_.stream(); }
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private:
|
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SystemErrorCode err_;
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|
// Optional name of the module defining the error.
|
|
const char* module_;
|
|
LogMessage log_message_;
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|
DISALLOW_COPY_AND_ASSIGN(Win32ErrorLogMessage);
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|
};
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|
#elif defined(OS_POSIX)
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|
// Appends a formatted system message of the errno type
|
|
class BASE_EXPORT ErrnoLogMessage {
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|
public:
|
|
ErrnoLogMessage(const char* file,
|
|
int line,
|
|
LogSeverity severity,
|
|
SystemErrorCode err);
|
|
|
|
// Appends the error message before destructing the encapsulated class.
|
|
~ErrnoLogMessage();
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|
|
|
std::ostream& stream() { return log_message_.stream(); }
|
|
|
|
private:
|
|
SystemErrorCode err_;
|
|
LogMessage log_message_;
|
|
|
|
DISALLOW_COPY_AND_ASSIGN(ErrnoLogMessage);
|
|
};
|
|
#endif // OS_WIN
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|
|
// Closes the log file explicitly if open.
|
|
// NOTE: Since the log file is opened as necessary by the action of logging
|
|
// statements, there's no guarantee that it will stay closed
|
|
// after this call.
|
|
BASE_EXPORT void CloseLogFile();
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|
|
|
// Async signal safe logging mechanism.
|
|
BASE_EXPORT void RawLog(int level, const char* message);
|
|
|
|
#define RAW_LOG(level, message) logging::RawLog(logging::LOG_ ## level, message)
|
|
|
|
#define RAW_CHECK(condition) \
|
|
do { \
|
|
if (!(condition)) \
|
|
logging::RawLog(logging::LOG_FATAL, "Check failed: " #condition "\n"); \
|
|
} while (0)
|
|
|
|
#if defined(OS_WIN)
|
|
// Returns the default log file path.
|
|
BASE_EXPORT std::wstring GetLogFileFullPath();
|
|
#endif
|
|
|
|
} // namespace logging
|
|
|
|
// These functions are provided as a convenience for logging, which is where we
|
|
// use streams (it is against Google style to use streams in other places). It
|
|
// is designed to allow you to emit non-ASCII Unicode strings to the log file,
|
|
// which is normally ASCII. It is relatively slow, so try not to use it for
|
|
// common cases. Non-ASCII characters will be converted to UTF-8 by these
|
|
// operators.
|
|
BASE_EXPORT std::ostream& operator<<(std::ostream& out, const wchar_t* wstr);
|
|
inline std::ostream& operator<<(std::ostream& out, const std::wstring& wstr) {
|
|
return out << wstr.c_str();
|
|
}
|
|
|
|
// The NOTIMPLEMENTED() macro annotates codepaths which have
|
|
// not been implemented yet.
|
|
//
|
|
// The implementation of this macro is controlled by NOTIMPLEMENTED_POLICY:
|
|
// 0 -- Do nothing (stripped by compiler)
|
|
// 1 -- Warn at compile time
|
|
// 2 -- Fail at compile time
|
|
// 3 -- Fail at runtime (DCHECK)
|
|
// 4 -- [default] LOG(ERROR) at runtime
|
|
// 5 -- LOG(ERROR) at runtime, only once per call-site
|
|
|
|
#ifndef NOTIMPLEMENTED_POLICY
|
|
#if defined(OS_ANDROID) && defined(OFFICIAL_BUILD)
|
|
#define NOTIMPLEMENTED_POLICY 0
|
|
#else
|
|
// Select default policy: LOG(ERROR)
|
|
#define NOTIMPLEMENTED_POLICY 4
|
|
#endif
|
|
#endif
|
|
|
|
#if defined(COMPILER_GCC)
|
|
// On Linux, with GCC, we can use __PRETTY_FUNCTION__ to get the demangled name
|
|
// of the current function in the NOTIMPLEMENTED message.
|
|
#define NOTIMPLEMENTED_MSG "Not implemented reached in " << __PRETTY_FUNCTION__
|
|
#else
|
|
#define NOTIMPLEMENTED_MSG "NOT IMPLEMENTED"
|
|
#endif
|
|
|
|
#if NOTIMPLEMENTED_POLICY == 0
|
|
#define NOTIMPLEMENTED() EAT_STREAM_PARAMETERS
|
|
#elif NOTIMPLEMENTED_POLICY == 1
|
|
// TODO, figure out how to generate a warning
|
|
#define NOTIMPLEMENTED() COMPILE_ASSERT(false, NOT_IMPLEMENTED)
|
|
#elif NOTIMPLEMENTED_POLICY == 2
|
|
#define NOTIMPLEMENTED() COMPILE_ASSERT(false, NOT_IMPLEMENTED)
|
|
#elif NOTIMPLEMENTED_POLICY == 3
|
|
#define NOTIMPLEMENTED() NOTREACHED()
|
|
#elif NOTIMPLEMENTED_POLICY == 4
|
|
#define NOTIMPLEMENTED() LOG(ERROR) << NOTIMPLEMENTED_MSG
|
|
#elif NOTIMPLEMENTED_POLICY == 5
|
|
#define NOTIMPLEMENTED() do {\
|
|
static bool logged_once = false;\
|
|
LOG_IF(ERROR, !logged_once) << NOTIMPLEMENTED_MSG;\
|
|
logged_once = true;\
|
|
} while(0);\
|
|
EAT_STREAM_PARAMETERS
|
|
#endif
|
|
|
|
#endif // BASE_LOGGING_H_
|