logging.h revision 5821806d5e7f356e8fa4b058a389a808ea183019 
1// Copyright 2009 The RE2 Authors.  All Rights Reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5// Simplified version of Google's logging.
6
7#ifndef RE2_UTIL_LOGGING_H__
8#define RE2_UTIL_LOGGING_H__
9
10#ifndef WIN32
11#include <unistd.h>  /* for write */
12#endif
13#include <sstream>
14#ifdef WIN32
15#include <io.h>
16#endif
17
18// Debug-only checking.
19#define DCHECK(condition) assert(condition)
20#define DCHECK_EQ(val1, val2) assert((val1) == (val2))
21#define DCHECK_NE(val1, val2) assert((val1) != (val2))
22#define DCHECK_LE(val1, val2) assert((val1) <= (val2))
23#define DCHECK_LT(val1, val2) assert((val1) < (val2))
24#define DCHECK_GE(val1, val2) assert((val1) >= (val2))
25#define DCHECK_GT(val1, val2) assert((val1) > (val2))
26
27// Always-on checking
28#define CHECK(x)	if(x){}else LogMessageFatal(__FILE__, __LINE__).stream() << "Check failed: " #x
29#define CHECK_LT(x, y)	CHECK((x) < (y))
30#define CHECK_GT(x, y)	CHECK((x) > (y))
31#define CHECK_LE(x, y)	CHECK((x) <= (y))
32#define CHECK_GE(x, y)	CHECK((x) >= (y))
33#define CHECK_EQ(x, y)	CHECK((x) == (y))
34#define CHECK_NE(x, y)	CHECK((x) != (y))
35
36#define LOG_INFO LogMessage(__FILE__, __LINE__)
37#define LOG_ERROR LOG_INFO
38#define LOG_WARNING LOG_INFO
39#define LOG_FATAL LogMessageFatal(__FILE__, __LINE__)
40#define LOG_QFATAL LOG_FATAL
41
42#define VLOG(x) if((x)>0){}else LOG_INFO.stream()
43
44#ifdef NDEBUG
45#define DEBUG_MODE 0
46#define LOG_DFATAL LOG_ERROR
47#else
48#define DEBUG_MODE 1
49#define LOG_DFATAL LOG_FATAL
50#endif
51
52#define LOG(severity) LOG_ ## severity.stream()
53
54class LogMessage {
55 public:
56  LogMessage(const char* file, int line) : flushed_(false) {
57    stream() << file << ":" << line << ": ";
58  }
59  void Flush() {
60    stream() << "\n";
61    string s = str_.str();
62    if(write(2, s.data(), s.size()) < 0) {}  // shut up gcc
63    flushed_ = true;
64  }
65  ~LogMessage() {
66    if (!flushed_) {
67      Flush();
68    }
69  }
70  ostream& stream() { return str_; }
71
72 private:
73  bool flushed_;
74  std::ostringstream str_;
75  DISALLOW_EVIL_CONSTRUCTORS(LogMessage);
76};
77
78class LogMessageFatal : public LogMessage {
79 public:
80  LogMessageFatal(const char* file, int line)
81    : LogMessage(file, line) { }
82  ~LogMessageFatal() {
83    Flush();
84    abort();
85  }
86 private:
87  DISALLOW_EVIL_CONSTRUCTORS(LogMessageFatal);
88};
89
90#endif  // RE2_UTIL_LOGGING_H__
91