71 // LogHandle(logging) log;
72 // if (log.is_debug()) {
73 // ...
74 // log.debug("result = %d", result).trace(" tracing info");
75 // obj->print_on(log.debug_stream());
76 // }
77 //
78 #define LogHandle(...) Log<LOG_TAGS(__VA_ARGS__)>
79
80 template <LogTagType T0, LogTagType T1 = LogTag::__NO_TAG, LogTagType T2 = LogTag::__NO_TAG, LogTagType T3 = LogTag::__NO_TAG,
81 LogTagType T4 = LogTag::__NO_TAG, LogTagType GuardTag = LogTag::__NO_TAG>
82 class Log VALUE_OBJ_CLASS_SPEC {
83 private:
84 static const size_t LogBufferSize = 512;
85 public:
86 // Make sure no more than the maximum number of tags have been given.
87 // The GuardTag allows this to be detected if/when it happens. If the GuardTag
88 // is not __NO_TAG, the number of tags given exceeds the maximum allowed.
89 STATIC_ASSERT(GuardTag == LogTag::__NO_TAG); // Number of logging tags exceeds maximum supported!
90
91 static bool is_level(LogLevelType level) {
92 return LogTagSetMapping<T0, T1, T2, T3, T4>::tagset().is_level(level);
93 }
94
95 template <LogLevelType Level>
96 ATTRIBUTE_PRINTF(1, 2)
97 static void write(const char* fmt, ...) {
98 va_list args;
99 va_start(args, fmt);
100 vwrite<Level>(fmt, args);
101 va_end(args);
102 };
103
104 template <LogLevelType Level>
105 ATTRIBUTE_PRINTF(1, 0)
106 static void vwrite(const char* fmt, va_list args) {
107 char buf[LogBufferSize];
108 size_t prefix_len = LogPrefix<T0, T1, T2, T3, T4>::prefix(buf, sizeof(buf));
109 // Check that string fits in buffer; resize buffer if necessary
110 int ret = os::log_vsnprintf(buf + prefix_len, sizeof(buf) - prefix_len, fmt, args);
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71 // LogHandle(logging) log;
72 // if (log.is_debug()) {
73 // ...
74 // log.debug("result = %d", result).trace(" tracing info");
75 // obj->print_on(log.debug_stream());
76 // }
77 //
78 #define LogHandle(...) Log<LOG_TAGS(__VA_ARGS__)>
79
80 template <LogTagType T0, LogTagType T1 = LogTag::__NO_TAG, LogTagType T2 = LogTag::__NO_TAG, LogTagType T3 = LogTag::__NO_TAG,
81 LogTagType T4 = LogTag::__NO_TAG, LogTagType GuardTag = LogTag::__NO_TAG>
82 class Log VALUE_OBJ_CLASS_SPEC {
83 private:
84 static const size_t LogBufferSize = 512;
85 public:
86 // Make sure no more than the maximum number of tags have been given.
87 // The GuardTag allows this to be detected if/when it happens. If the GuardTag
88 // is not __NO_TAG, the number of tags given exceeds the maximum allowed.
89 STATIC_ASSERT(GuardTag == LogTag::__NO_TAG); // Number of logging tags exceeds maximum supported!
90
91 Log() {}
92
93 static bool is_level(LogLevelType level) {
94 return LogTagSetMapping<T0, T1, T2, T3, T4>::tagset().is_level(level);
95 }
96
97 template <LogLevelType Level>
98 ATTRIBUTE_PRINTF(1, 2)
99 static void write(const char* fmt, ...) {
100 va_list args;
101 va_start(args, fmt);
102 vwrite<Level>(fmt, args);
103 va_end(args);
104 };
105
106 template <LogLevelType Level>
107 ATTRIBUTE_PRINTF(1, 0)
108 static void vwrite(const char* fmt, va_list args) {
109 char buf[LogBufferSize];
110 size_t prefix_len = LogPrefix<T0, T1, T2, T3, T4>::prefix(buf, sizeof(buf));
111 // Check that string fits in buffer; resize buffer if necessary
112 int ret = os::log_vsnprintf(buf + prefix_len, sizeof(buf) - prefix_len, fmt, args);
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