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// Copyright 2009 The RE2 Authors. All Rights Reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#ifndef UTIL_LOGGING_H_
#define UTIL_LOGGING_H_
// Simplified version of Google's logging.
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <ostream>
#include <sstream>
#include "util/util.h"
// Debug-only checking.
#define DCHECK(condition) assert(condition)
#define DCHECK_EQ(val1, val2) assert((val1) == (val2))
#define DCHECK_NE(val1, val2) assert((val1) != (val2))
#define DCHECK_LE(val1, val2) assert((val1) <= (val2))
#define DCHECK_LT(val1, val2) assert((val1) < (val2))
#define DCHECK_GE(val1, val2) assert((val1) >= (val2))
#define DCHECK_GT(val1, val2) assert((val1) > (val2))
// Always-on checking
#define CHECK(x) if(x){}else LogMessageFatal(__FILE__, __LINE__).stream() << "Check failed: " #x
#define CHECK_LT(x, y) CHECK((x) < (y))
#define CHECK_GT(x, y) CHECK((x) > (y))
#define CHECK_LE(x, y) CHECK((x) <= (y))
#define CHECK_GE(x, y) CHECK((x) >= (y))
#define CHECK_EQ(x, y) CHECK((x) == (y))
#define CHECK_NE(x, y) CHECK((x) != (y))
#define LOG_INFO LogMessage(__FILE__, __LINE__)
#define LOG_WARNING LogMessage(__FILE__, __LINE__)
#define LOG_ERROR LogMessage(__FILE__, __LINE__)
#define LOG_FATAL LogMessageFatal(__FILE__, __LINE__)
#define LOG_QFATAL LOG_FATAL
// It seems that one of the Windows header files defines ERROR as 0.
#ifdef _WIN32
#define LOG_0 LOG_INFO
#endif
#ifdef NDEBUG
#define LOG_DFATAL LOG_ERROR
#else
#define LOG_DFATAL LOG_FATAL
#endif
#define LOG(severity) LOG_ ## severity.stream()
#define VLOG(x) if((x)>0){}else LOG_INFO.stream()
class LogMessage {
public:
LogMessage(const char* file, int line)
: flushed_(false) {
stream() << file << ":" << line << ": ";
}
void Flush() {
stream() << "\n";
std::string s = str_.str();
size_t n = s.size();
if (fwrite(s.data(), 1, n, stderr) < n) {} // shut up gcc
flushed_ = true;
}
~LogMessage() {
if (!flushed_) {
Flush();
}
}
std::ostream& stream() { return str_; }
private:
bool flushed_;
std::ostringstream str_;
LogMessage(const LogMessage&) = delete;
LogMessage& operator=(const LogMessage&) = delete;
};
// Silence "destructor never returns" warning for ~LogMessageFatal().
// Since this is a header file, push and then pop to limit the scope.
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable: 4722)
#endif
class LogMessageFatal : public LogMessage {
public:
LogMessageFatal(const char* file, int line)
: LogMessage(file, line) {}
ATTRIBUTE_NORETURN ~LogMessageFatal() {
Flush();
abort();
}
private:
LogMessageFatal(const LogMessageFatal&) = delete;
LogMessageFatal& operator=(const LogMessageFatal&) = delete;
};
#ifdef _MSC_VER
#pragma warning(pop)
#endif
#endif // UTIL_LOGGING_H_
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