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third_party/libjingle/overrides/talk/base/logging.h

Index: third_party/libjingle/overrides/talk/base/logging.h
diff --git a/third_party/libjingle/overrides/talk/base/logging.h b/third_party/libjingle/overrides/talk/base/logging.h
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+/*
+ * libjingle
+ * Copyright 2004--2005, Google Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright notice,
+ *     this list of conditions and the following disclaimer in the documentation
+ *     and/or other materials provided with the distribution.
+ *  3. The name of the author may not be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+//   LOG(...) an ostream target that can be used to send formatted
+// output to a variety of logging targets, such as debugger console, stderr,
+// file, or any StreamInterface.
+//   The severity level passed as the first argument to the the LOGging
+// functions is used as a filter, to limit the verbosity of the logging.
+//   Static members of LogMessage documented below are used to control the
+// verbosity and target of the output.
+//   There are several variations on the LOG macro which facilitate logging
+// of common error conditions, detailed below.
+
+// LOG(sev) logs the given stream at severity "sev", which must be a
+//     compile-time constant of the LoggingSeverity type, without the namespace
+//     prefix.
+// LOG_V(sev) Like LOG(), but sev is a run-time variable of the LoggingSeverity
+//     type (basically, it just doesn't prepend the namespace).
+// LOG_F(sev) Like LOG(), but includes the name of the current function.
+// LOG_GLE(M)(sev [, mod]) attempt to add a string description of the
+//     HRESULT returned by GetLastError.  The "M" variant allows searching of a
+//     DLL's string table for the error description.
+// LOG_ERRNO(sev) attempts to add a string description of an errno-derived
+//     error. errno and associated facilities exist on both Windows and POSIX,
+//     but on Windows they only apply to the C/C++ runtime.
+// LOG_ERR(sev) is an alias for the platform's normal error system, i.e. _GLE on
+//     Windows and _ERRNO on POSIX.
+// (The above three also all have _EX versions that let you specify the error
+// code, rather than using the last one.)
+// LOG_E(sev, ctx, err, ...) logs a detailed error interpreted using the
+//     specified context.
+// LOG_CHECK_LEVEL(sev) (and LOG_CHECK_LEVEL_V(sev)) can be used as a test
+//     before performing expensive or sensitive operations whose sole purpose is
+//     to output logging data at the desired level.
+// Lastly, PLOG(sev, err) is an alias for LOG_ERR_EX.
+
+#ifndef TALK_BASE_LOGGING_H_
+#define TALK_BASE_LOGGING_H_
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"  // NOLINT
+#endif
+
+#include <list>
+#include <sstream>
+#include <string>
+#include <utility>
+#include "talk/base/basictypes.h"
+#include "talk/base/criticalsection.h"
+
+namespace talk_base {
+
+class StreamInterface;
+
+///////////////////////////////////////////////////////////////////////////////
+// ConstantLabel can be used to easily generate string names from constant
+// values.  This can be useful for logging descriptive names of error messages.
+// Usage:
+//   const ConstantLabel LIBRARY_ERRORS[] = {
+//     KLABEL(SOME_ERROR),
+//     KLABEL(SOME_OTHER_ERROR),
+//     ...
+//     LASTLABEL
+//   }
+//
+//   int err = LibraryFunc();
+//   LOG(LS_ERROR) << "LibraryFunc returned: "
+//                 << ErrorName(err, LIBRARY_ERRORS);
+
+struct ConstantLabel { int value; const char * label; };
+
+#if defined(SAFE_TO_DEFINE_TALK_BASE_LOGGING_MACROS)
+#define KLABEL(x) { x, #x }
+#define TLABEL(x, y) { x, y }
+#define LASTLABEL { 0, 0 }
+#endif  // defined(SAFE_TO_DEFINE_TALK_BASE_LOGGING_MACROS)
+
+const char * FindLabel(int value, const ConstantLabel entries[]);
+std::string ErrorName(int err, const ConstantLabel* err_table);
+
+//////////////////////////////////////////////////////////////////////
+
+// Note that the non-standard LoggingSeverity aliases exist because they are
+// still in broad use.  The meanings of the levels are:
+//  LS_SENSITIVE: Information which should only be logged with the consent
+//   of the user, due to privacy concerns.
+//  LS_VERBOSE: This level is for data which we do not want to appear in the
+//   normal debug log, but should appear in diagnostic logs.
+//  LS_INFO: Chatty level used in debugging for all sorts of things, the default
+//   in debug builds.
+//  LS_WARNING: Something that may warrant investigation.
+//  LS_ERROR: Something that should not have occurred.
+enum LoggingSeverity { LS_SENSITIVE, LS_VERBOSE, LS_INFO, LS_WARNING, LS_ERROR,
+                       INFO = LS_INFO,
+                       WARNING = LS_WARNING,
+                       LERROR = LS_ERROR };
+
+// LogErrorContext assists in interpreting the meaning of an error value.
+enum LogErrorContext {
+  ERRCTX_NONE,
+  ERRCTX_ERRNO,     // System-local errno
+  ERRCTX_HRESULT,   // Windows HRESULT
+  ERRCTX_OSSTATUS,  // MacOS OSStatus
+
+  // Abbreviations for LOG_E macro
+  ERRCTX_EN = ERRCTX_ERRNO,     // LOG_E(sev, EN, x)
+  ERRCTX_HR = ERRCTX_HRESULT,   // LOG_E(sev, HR, x)
+  ERRCTX_OS = ERRCTX_OSSTATUS,  // LOG_E(sev, OS, x)
+};
+
+class LogMessage {
+ public:
+  static const int NO_LOGGING;
+
+  LogMessage(const char* file, int line, LoggingSeverity sev,
+             LogErrorContext err_ctx = ERRCTX_NONE, int err = 0,
+             const char* module = NULL);
+  ~LogMessage();
+
+  static inline bool Loggable(LoggingSeverity sev) { return (sev >= min_sev_); }
+  std::ostream& stream() { return print_stream_; }
+
+  // These are attributes which apply to all logging channels
+  //  LogContext: Display the file and line number of the message
+  static void LogContext(int min_sev);
+  //  LogThreads: Display the thread identifier of the current thread
+  static void LogThreads(bool on = true);
+  //  LogTimestamps: Display the elapsed time of the program
+  static void LogTimestamps(bool on = true);
+
+  // Timestamps begin with program execution, but can be reset with this
+  // function for measuring the duration of an activity, or to synchronize
+  // timestamps between multiple instances.
+  static void ResetTimestamps();
+
+  // These are the available logging channels
+  //  Debug: Debug console on Windows, otherwise stderr
+  static void LogToDebug(int min_sev);
+  static int GetLogToDebug() { return dbg_sev_; }
+
+  //  Stream: Any non-blocking stream interface.  LogMessage takes ownership of
+  //   the stream. Multiple streams may be specified by using AddLogToStream.
+  //   LogToStream is retained for backwards compatibility; when invoked, it
+  //   will discard any previously set streams and install the specified stream.
+  //   GetLogToStream gets the severity for the specified stream, of if none
+  //   is specified, the minimum stream severity.
+  //   RemoveLogToStream removes the specified stream, without destroying it.
+  static void LogToStream(StreamInterface* stream, int min_sev);
+  static int GetLogToStream(StreamInterface* stream = NULL);
+  static void AddLogToStream(StreamInterface* stream, int min_sev);
+  static void RemoveLogToStream(StreamInterface* stream);
+
+  // Testing against MinLogSeverity allows code to avoid potentially expensive
+  // logging operations by pre-checking the logging level.
+  static int GetMinLogSeverity() { return min_sev_; }
+
+  static void SetDiagnosticMode(bool f) { is_diagnostic_mode_ = f; }
+  static bool IsDiagnosticMode() { return is_diagnostic_mode_; }
+
+  // Parses the provided parameter stream to configure the options above.
+  // Useful for configuring logging from the command line.  If file logging
+  // is enabled, it is output to the specified filename.
+  static void ConfigureLogging(const char* params, const char* filename);
+
+  // Convert the string to a LS_ value; also accept numeric values.
+  static int ParseLogSeverity(const std::string& value);
+
+ private:
+  typedef std::list<std::pair<StreamInterface*, int> > StreamList;
+
+  // Updates min_sev_ appropriately when debug sinks change.
+  static void UpdateMinLogSeverity();
+
+  // These assist in formatting some parts of the debug output.
+  static const char* Describe(LoggingSeverity sev);
+  static const char* DescribeFile(const char* file);
+
+  // These write out the actual log messages.
+  static void OutputToDebug(const std::string& msg, LoggingSeverity severity_);
+  static void OutputToStream(StreamInterface* stream, const std::string& msg);
+
+  // The ostream that buffers the formatted message before output
+  std::ostringstream print_stream_;
+
+  // The severity level of this message
+  LoggingSeverity severity_;
+
+  // String data generated in the constructor, that should be appended to
+  // the message before output.
+  std::string extra_;
+
+  // Global lock for the logging subsystem
+  static CriticalSection crit_;
+
+  // dbg_sev_ is the thresholds for those output targets
+  // min_sev_ is the minimum (most verbose) of those levels, and is used
+  //  as a short-circuit in the logging macros to identify messages that won't
+  //  be logged.
+  // ctx_sev_ is the minimum level at which file context is displayed
+  static int min_sev_, dbg_sev_, ctx_sev_;
+
+  // The output streams and their associated severities
+  static StreamList streams_;
+
+  // Flags for formatting options
+  static bool thread_, timestamp_;
+
+  // The timestamp at which logging started.
+  static uint32 start_;
+
+  // are we in diagnostic mode (as defined by the app)?
+  static bool is_diagnostic_mode_;
+
+  DISALLOW_EVIL_CONSTRUCTORS(LogMessage);
+};
+
+//////////////////////////////////////////////////////////////////////
+// Logging Helpers
+//////////////////////////////////////////////////////////////////////
+
+class LogMultilineState {
+ public:
+  size_t unprintable_count_[2];
+  LogMultilineState() {
+    unprintable_count_[0] = unprintable_count_[1] = 0;
+  }
+};
+
+// When possible, pass optional state variable to track various data across
+// multiple calls to LogMultiline.  Otherwise, pass NULL.
+void LogMultiline(LoggingSeverity level, const char* label, bool input,
+                  const void* data, size_t len, bool hex_mode,
+                  LogMultilineState* state);
+
+//////////////////////////////////////////////////////////////////////
+// Macros which automatically disable logging when LOGGING == 0
+//////////////////////////////////////////////////////////////////////
+
+// If LOGGING is not explicitly defined, default to enabled in debug mode
+#if defined(SAFE_TO_DEFINE_TALK_BASE_LOGGING_MACROS)
+#if !defined(LOGGING)
+#if defined(_DEBUG) && !defined(NDEBUG)
+#define LOGGING 1
+#else
+#define LOGGING 0
+#endif
+#endif  // !defined(LOGGING)
+
+#ifndef LOG
+#if LOGGING
+
+// The following non-obvious technique for implementation of a
+// conditional log stream was stolen from google3/base/logging.h.
+
+// 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&) { }
+};
+
+#define LOG_SEVERITY_PRECONDITION(sev) \
+  !(talk_base::LogMessage::Loggable(sev)) \
+    ? (void) 0 \
+    : talk_base::LogMessageVoidify() &
+
+#define LOG(sev) \
+  LOG_SEVERITY_PRECONDITION(talk_base::sev) \
+    talk_base::LogMessage(__FILE__, __LINE__, talk_base::sev).stream()
+
+// The _V version is for when a variable is passed in.  It doesn't do the
+// namespace concatination.
+#define LOG_V(sev) \
+  LOG_SEVERITY_PRECONDITION(sev) \
+    talk_base::LogMessage(__FILE__, __LINE__, sev).stream()
+
+// The _F version prefixes the message with the current function name.
+#if defined(__GNUC__) && defined(_DEBUG)
+#define LOG_F(sev) LOG(sev) << __PRETTY_FUNCTION__ << ": "
+#else
+#define LOG_F(sev) LOG(sev) << __FUNCTION__ << ": "
+#endif
+
+#define LOG_CHECK_LEVEL(sev) \
+  talk_base::LogCheckLevel(talk_base::sev)
+#define LOG_CHECK_LEVEL_V(sev) \
+  talk_base::LogCheckLevel(sev)
+inline bool LogCheckLevel(LoggingSeverity sev) {
+  return (LogMessage::GetMinLogSeverity() <= sev);
+}
+
+#define LOG_E(sev, ctx, err, ...) \
+  LOG_SEVERITY_PRECONDITION(talk_base::sev) \
+    talk_base::LogMessage(__FILE__, __LINE__, talk_base::sev, \
+                          talk_base::ERRCTX_ ## ctx, err , ##__VA_ARGS__) \
+        .stream()
+
+#else  // !LOGGING
+
+// Hopefully, the compiler will optimize away some of this code.
+// Note: syntax of "1 ? (void)0 : LogMessage" was causing errors in g++,
+//   converted to "while (false)"
+#define LOG(sev) \
+  while (false)talk_base:: LogMessage(NULL, 0, talk_base::sev).stream()
+#define LOG_V(sev) \
+  while (false) talk_base::LogMessage(NULL, 0, sev).stream()
+#define LOG_F(sev) LOG(sev) << __FUNCTION__ << ": "
+#define LOG_CHECK_LEVEL(sev) \
+  false
+#define LOG_CHECK_LEVEL_V(sev) \
+  false
+
+#define LOG_E(sev, ctx, err, ...) \
+  while (false) talk_base::LogMessage(__FILE__, __LINE__, talk_base::sev, \
+                          talk_base::ERRCTX_ ## ctx, err , ##__VA_ARGS__) \
+      .stream()
+
+#endif  // !LOGGING
+
+#define LOG_ERRNO_EX(sev, err) \
+  LOG_E(sev, ERRNO, err)
+#define LOG_ERRNO(sev) \
+  LOG_ERRNO_EX(sev, errno)
+
+#ifdef WIN32
+#define LOG_GLE_EX(sev, err) \
+  LOG_E(sev, HRESULT, err)
+#define LOG_GLE(sev) \
+  LOG_GLE_EX(sev, GetLastError())
+#define LOG_GLEM(sev, mod) \
+  LOG_E(sev, HRESULT, GetLastError(), mod)
+#define LOG_ERR_EX(sev, err) \
+  LOG_GLE_EX(sev, err)
+#define LOG_ERR(sev) \
+  LOG_GLE(sev)
+#define LAST_SYSTEM_ERROR \
+  (::GetLastError())
+#elif POSIX
+#define LOG_ERR_EX(sev, err) \
+  LOG_ERRNO_EX(sev, err)
+#define LOG_ERR(sev) \
+  LOG_ERRNO(sev)
+#define LAST_SYSTEM_ERROR \
+  (errno)
+#endif  // WIN32
+
+#define PLOG(sev, err) \
+  LOG_ERR_EX(sev, err)
+
+// TODO(?): Add an "assert" wrapper that logs in the same manner.
+
+#endif  // LOG
+#endif  // defined(SAFE_TO_DEFINE_TALK_BASE_LOGGING_MACROS)
+
+}  // namespace talk_base
+
+#endif  // TALK_BASE_LOGGING_H_