1 // Copyright 2006-2009 the V8 project authors. All rights reserved.
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3 // modification, are permitted provided that the following conditions are
6 // * Redistributions of source code must retain the above copyright
7 // notice, this list of conditions and the following disclaimer.
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11 // with the distribution.
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16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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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.
42 void Initialize(const char* log_file_name);
44 // Disables logging, but preserves acquired resources.
45 void stop() { is_stopped_ = true; }
47 static bool InitLogAtStart() {
48 return FLAG_log || FLAG_log_runtime || FLAG_log_api
49 || FLAG_log_code || FLAG_log_gc || FLAG_log_handles || FLAG_log_suspect
50 || FLAG_log_regexp || FLAG_ll_prof || FLAG_perf_basic_prof
51 || FLAG_perf_jit_prof || FLAG_log_internal_timer_events;
54 // Frees all resources acquired in Initialize and Open... functions.
55 // When a temporary file is used for the log, returns its stream descriptor,
56 // leaving the file open.
59 // Returns whether logging is enabled.
61 return !is_stopped_ && output_handle_ != NULL;
64 // Size of buffer used for formatting log messages.
65 static const int kMessageBufferSize = 2048;
67 // This mode is only used in tests, as temporary files are automatically
68 // deleted on close and thus can't be accessed afterwards.
69 static const char* const kLogToTemporaryFile;
70 static const char* const kLogToConsole;
72 // Utility class for formatting log messages. It fills the message into the
73 // static buffer in Log.
74 class MessageBuilder BASE_EMBEDDED {
76 // Create a message builder starting from position 0.
77 // This acquires the mutex in the log as well.
78 explicit MessageBuilder(Log* log);
81 // Append string data to the log message.
82 void Append(const char* format, ...);
84 // Append string data to the log message.
85 void AppendVA(const char* format, va_list args);
87 // Append a character to the log message.
88 void Append(const char c);
90 // Append double quoted string to the log message.
91 void AppendDoubleQuotedString(const char* string);
93 // Append a heap string.
94 void Append(String* str);
96 // Appends an address.
97 void AppendAddress(Address addr);
99 void AppendSymbolName(Symbol* symbol);
101 void AppendDetailed(String* str, bool show_impl_info);
103 // Append a portion of a string.
104 void AppendStringPart(const char* str, int len);
106 // Write the log message to the log file currently opened.
107 void WriteToLogFile();
111 LockGuard<Mutex> lock_guard_;
116 explicit Log(Logger* logger);
118 // Opens stdout for logging.
121 // Opens file for logging.
122 void OpenFile(const char* name);
124 // Opens a temporary file for logging.
125 void OpenTemporaryFile();
127 // Implementation of writing to a log file.
128 int WriteToFile(const char* msg, int length) {
129 ASSERT(output_handle_ != NULL);
130 size_t rv = fwrite(msg, 1, length, output_handle_);
131 ASSERT(static_cast<size_t>(length) == rv);
133 fflush(output_handle_);
137 // Whether logging is stopped (e.g. due to insufficient resources).
140 // When logging is active output_handle_ is used to store a pointer to log
141 // destination. mutex_ should be acquired before using output_handle_.
142 FILE* output_handle_;
144 // mutex_ is a Mutex used for enforcing exclusive
145 // access to the formatting buffer and the log file or log memory buffer.
148 // Buffer used for formatting log messages. This is a singleton buffer and
149 // mutex_ should be acquired before using it.
150 char* message_buffer_;
158 } } // namespace v8::internal
160 #endif // V8_LOG_UTILS_H_