chromium/third_party/breakpad/breakpad/src/processor/logging.h

// Copyright 2007 Google LLC
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * 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.
//     * Neither the name of Google LLC nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "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 COPYRIGHT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// logging.h: Breakpad logging
//
// Breakpad itself uses Breakpad logging with statements of the form:
//   BPLOG(severity) << "message";
// severity may be INFO, ERROR, or other values defined in this file.
//
// BPLOG is an overridable macro so that users can customize Breakpad's
// logging.  Left at the default, logging messages are sent to stderr along
// with a timestamp and the source code location that produced a message.
// The streams may be changed by redefining BPLOG_*_STREAM, the logging
// behavior may be changed by redefining BPLOG_*, and the entire logging
// system may be overridden by redefining BPLOG(severity).  These
// redefinitions may be passed to the preprocessor as a command-line flag
// (-D).
//
// If an additional header is required to override Breakpad logging, it can
// be specified by the BP_LOGGING_INCLUDE macro.  If defined, this header
// will #include the header specified by that macro.
//
// If any initialization is needed before logging, it can be performed by
// a function called through the BPLOG_INIT macro.  Each main function of
// an executable program in the Breakpad processor library calls
// BPLOG_INIT(&argc, &argv); before any logging can be performed; define
// BPLOG_INIT appropriately if initialization is required.
//
// Author: Mark Mentovai

#ifndef PROCESSOR_LOGGING_H__
#define PROCESSOR_LOGGING_H__

#include <iostream>
#include <sstream>
#include <string>
#include <iomanip>

#include "common/using_std_string.h"
#include "google_breakpad/common/breakpad_types.h"

#ifdef BP_LOGGING_INCLUDE
#include BP_LOGGING_INCLUDE
#endif  // BP_LOGGING_INCLUDE

namespace google_breakpad {

// These are defined in Microsoft headers.
#ifdef SEVERITY_ERROR
#undef SEVERITY_ERROR
#endif

#ifdef ERROR
#undef ERROR
#endif

class LogStream { … };

// 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 { … };

// Returns number formatted as a hexadecimal string, such as "0x7b".
template<typename T>
string HexString(T number) { … }

// Returns the error code as set in the global errno variable, and sets
// error_string, a required argument, to a string describing that error
// code.
int ErrnoString(string* error_string);

}  // namespace google_breakpad

#ifndef BPLOG_INIT
#define BPLOG_INIT(pargc, pargv) …
#endif  // BPLOG_INIT

#ifndef BPLOG_LAZY_STREAM
#define BPLOG_LAZY_STREAM(stream, condition) …
#endif

#ifndef BPLOG_MINIMUM_SEVERITY
#define BPLOG_MINIMUM_SEVERITY …
#endif

#define BPLOG_LOG_IS_ON(severity) …

#ifndef BPLOG
#define BPLOG(severity) …
#endif  // BPLOG

#ifndef BPLOG_INFO
#ifndef BPLOG_INFO_STREAM
#define BPLOG_INFO_STREAM …
#endif  // BPLOG_INFO_STREAM
#define BPLOG_INFO …
#endif  // BPLOG_INFO

#ifndef BPLOG_ERROR
#ifndef BPLOG_ERROR_STREAM
#define BPLOG_ERROR_STREAM …
#endif  // BPLOG_ERROR_STREAM
#define BPLOG_ERROR …
#endif  // BPLOG_ERROR

#ifndef BPLOG_CRITICAL
#ifndef BPLOG_CRITICAL_STREAM
#define BPLOG_CRITICAL_STREAM …
#endif  // BPLOG_CRITICAL_STREAM
#define BPLOG_CRITICAL …
#endif  // BPLOG_CRITICAL

#ifndef BPLOG_IF
#define BPLOG_IF(severity, condition) …
#endif  // BPLOG_IF

#endif  // PROCESSOR_LOGGING_H__