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 57 class LogMessage { 58 public: LogMessage(const char * file,int line)59 LogMessage(const char* file, int line) 60 : flushed_(false) { 61 stream() << file << ":" << line << ": "; 62 } Flush()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 } ~LogMessage()70 ~LogMessage() { 71 if (!flushed_) { 72 Flush(); 73 } 74 } stream()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 92 class LogMessageFatal : public LogMessage { 93 public: LogMessageFatal(const char * file,int line)94 LogMessageFatal(const char* file, int line) 95 : LogMessage(file, line) {} ~LogMessageFatal()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