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// Copyright (c) 2007, Google Inc.
// All rights reserved.
//
// 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 Inc. 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
// OWNER OR CONTRIBUTORS 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.
// 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 <string>
#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 {
public:
enum Severity {
SEVERITY_INFO,
SEVERITY_ERROR
};
// Begin logging a message to the stream identified by |stream|, at the
// indicated severity. The file and line parameters should be set so as to
// identify the line of source code that is producing a message.
LogStream(std::ostream &stream, Severity severity,
const char *file, int line);
// Finish logging by printing a newline and flushing the output stream.
~LogStream();
template<typename T> std::ostream& operator<<(const T &t) {
return stream_ << t;
}
private:
std::ostream &stream_;
// Disallow copy constructor and assignment operator
explicit LogStream(const LogStream &that);
void operator=(const LogStream &that);
};
// 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 &) {}
};
// Returns number formatted as a hexadecimal string, such as "0x7b".
string HexString(u_int32_t number);
string HexString(u_int64_t number);
string HexString(int 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
#define BPLOG(severity) BPLOG_ ## severity
#endif // BPLOG
#ifndef BPLOG_INFO
#ifndef BPLOG_INFO_STREAM
#define BPLOG_INFO_STREAM std::clog
#endif // BPLOG_INFO_STREAM
#define BPLOG_INFO google_breakpad::LogStream(BPLOG_INFO_STREAM, \
google_breakpad::LogStream::SEVERITY_INFO, \
__FILE__, __LINE__)
#endif // BPLOG_INFO
#ifndef BPLOG_ERROR
#ifndef BPLOG_ERROR_STREAM
#define BPLOG_ERROR_STREAM std::cerr
#endif // BPLOG_ERROR_STREAM
#define BPLOG_ERROR google_breakpad::LogStream(BPLOG_ERROR_STREAM, \
google_breakpad::LogStream::SEVERITY_ERROR, \
__FILE__, __LINE__)
#endif // BPLOG_ERROR
#define BPLOG_IF(severity, condition) \
!(condition) ? (void) 0 : \
google_breakpad::LogMessageVoidify() & BPLOG(severity)
#endif // PROCESSOR_LOGGING_H__
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