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3 // modification, are permitted provided that the following conditions are
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28 #ifndef V8_LOG_UTILS_H_
29 #define V8_LOG_UTILS_H_
31 #include "allocation.h"
38 // Functions and data for performing output of log messages.
41 // Performs process-wide initialization.
44 // Disables logging, but preserves acquired resources.
45 void stop() { is_stopped_ = true; }
47 // Frees all resources acquired in Initialize and Open... functions.
48 // When a temporary file is used for the log, returns its stream descriptor,
49 // leaving the file open.
52 // Returns whether logging is enabled.
54 return !is_stopped_ && output_handle_ != NULL;
57 // Size of buffer used for formatting log messages.
58 static const int kMessageBufferSize = 2048;
60 // This mode is only used in tests, as temporary files are automatically
61 // deleted on close and thus can't be accessed afterwards.
62 static const char* const kLogToTemporaryFile;
65 explicit Log(Logger* logger);
67 // Opens stdout for logging.
70 // Opens file for logging.
71 void OpenFile(const char* name);
73 // Opens a temporary file for logging.
74 void OpenTemporaryFile();
76 // Implementation of writing to a log file.
77 int WriteToFile(const char* msg, int length) {
78 ASSERT(output_handle_ != NULL);
79 size_t rv = fwrite(msg, 1, length, output_handle_);
80 ASSERT(static_cast<size_t>(length) == rv);
82 fflush(output_handle_);
86 // Whether logging is stopped (e.g. due to insufficient resources).
89 // When logging is active output_handle_ is used to store a pointer to log
90 // destination. mutex_ should be acquired before using output_handle_.
93 // Used when low-level profiling is active.
94 FILE* ll_output_handle_;
96 // mutex_ is a Mutex used for enforcing exclusive
97 // access to the formatting buffer and the log file or log memory buffer.
100 // Buffer used for formatting log messages. This is a singleton buffer and
101 // mutex_ should be acquired before using it.
102 char* message_buffer_;
107 friend class LogMessageBuilder;
111 // Utility class for formatting log messages. It fills the message into the
112 // static buffer in Log.
113 class LogMessageBuilder BASE_EMBEDDED {
115 // Create a message builder starting from position 0. This acquires the mutex
116 // in the log as well.
117 explicit LogMessageBuilder(Logger* logger);
118 ~LogMessageBuilder() { }
120 // Append string data to the log message.
121 void Append(const char* format, ...);
123 // Append string data to the log message.
124 void AppendVA(const char* format, va_list args);
126 // Append a character to the log message.
127 void Append(const char c);
129 // Append a heap string.
130 void Append(String* str);
132 // Appends an address.
133 void AppendAddress(Address addr);
135 void AppendDetailed(String* str, bool show_impl_info);
137 // Append a portion of a string.
138 void AppendStringPart(const char* str, int len);
140 // Write the log message to the log file currently opened.
141 void WriteToLogFile();
149 } } // namespace v8::internal
151 #endif // V8_LOG_UTILS_H_