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#ifndef UTIL_LOGGING_H_
6#define UTIL_LOGGING_H_
7
8// Simplified version of Google's logging.
9
10#include <assert.h>
11#include <stdio.h>
12#include <stdlib.h>
13#include <ostream>
14#include <sstream>
15
16#include "util/util.h"
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_WARNING LogMessage(__FILE__, __LINE__)
38#define LOG_ERROR LogMessage(__FILE__, __LINE__)
39#define LOG_FATAL LogMessageFatal(__FILE__, __LINE__)
40#define LOG_QFATAL LOG_FATAL
41
42// It seems that one of the Windows header files defines ERROR as 0.
43#ifdef _WIN32
44#define LOG_0 LOG_INFO
45#endif
46
47#ifdef NDEBUG
48#define LOG_DFATAL LOG_ERROR
49#else
50#define LOG_DFATAL LOG_FATAL
51#endif
52
53#define LOG(severity) LOG_ ## severity.stream()
54
55#define VLOG(x) if((x)>0){}else LOG_INFO.stream()
56
57class LogMessage {
58 public:
59 LogMessage(const char* file, int line)
60 : flushed_(false) {
61 stream() << file << ":" << line << ": ";
62 }
63 void Flush() {
64 stream() << "\n";
65 std::string s = str_.str();
66 size_t n = s.size();
67 if (fwrite(s.data(), 1, n, stderr) < n) {} // shut up gcc
68 flushed_ = true;
69 }
70 ~LogMessage() {
71 if (!flushed_) {
72 Flush();
73 }
74 }
75 std::ostream& stream() { return str_; }
76
77 private:
78 bool flushed_;
79 std::ostringstream str_;
80
81 LogMessage(const LogMessage&) = delete;
82 LogMessage& operator=(const LogMessage&) = delete;
83};
84
85// Silence "destructor never returns" warning for ~LogMessageFatal().
86// Since this is a header file, push and then pop to limit the scope.
87#ifdef _MSC_VER
88#pragma warning(push)
89#pragma warning(disable: 4722)
90#endif
91
92class LogMessageFatal : public LogMessage {
93 public:
94 LogMessageFatal(const char* file, int line)
95 : LogMessage(file, line) {}
96 ATTRIBUTE_NORETURN ~LogMessageFatal() {
97 Flush();
98 abort();
99 }
100 private:
101 LogMessageFatal(const LogMessageFatal&) = delete;
102 LogMessageFatal& operator=(const LogMessageFatal&) = delete;
103};
104
105#ifdef _MSC_VER
106#pragma warning(pop)
107#endif
108
109#endif // UTIL_LOGGING_H_
110