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1 // Copyright 2006-2009 the V8 project authors. All rights reserved. | |
2 // Redistribution and use in source and binary forms, with or without | |
3 // modification, are permitted provided that the following conditions are | |
4 // met: | |
5 // | |
6 // * Redistributions of source code must retain the above copyright | |
7 // notice, this list of conditions and the following disclaimer. | |
8 // * Redistributions in binary form must reproduce the above | |
9 // copyright notice, this list of conditions and the following | |
10 // disclaimer in the documentation and/or other materials provided | |
11 // with the distribution. | |
12 // * Neither the name of Google Inc. nor the names of its | |
13 // contributors may be used to endorse or promote products derived | |
14 // from this software without specific prior written permission. | |
15 // | |
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
27 | |
28 #ifndef V8_LOG_UTILS_H_ | |
29 #define V8_LOG_UTILS_H_ | |
30 | |
31 namespace v8 { | |
32 namespace internal { | |
33 | |
34 #ifdef ENABLE_LOGGING_AND_PROFILING | |
35 | |
36 // A memory buffer that increments its size as you write in it. Size | |
37 // is incremented with 'block_size' steps, never exceeding 'max_size'. | |
38 // During growth, memory contents are never copied. | |
39 // | |
40 // An instance of this class is created dynamically by Log. | |
41 class LogDynamicBuffer { | |
42 public: | |
43 LogDynamicBuffer(int block_size, int max_size); | |
44 | |
45 ~LogDynamicBuffer(); | |
46 | |
47 // Reads contents of the buffer starting from 'from_pos'. Upon | |
48 // return, 'dest_buf' is filled with the data. Actual amount of data | |
49 // filled is returned, it is <= that 'buf_size'. | |
Søren Thygesen Gjesse
2009/05/27 12:00:40
Remove that
Mikhail Naganov
2009/05/28 07:05:35
Done.
| |
50 int Read(int from_pos, char* dest_buf, int buf_size); | |
51 | |
52 // Writes 'data' to the buffer, making it larger if necessary. If | |
53 // data is too big to fit in the buffer, it doesn't get written at | |
54 // all. Returns amount of data written (it is either 'data_size', or | |
55 // 0, if 'data' is too big). | |
56 int Write(const char* data, int data_size); | |
57 | |
58 private: | |
59 int BlockIndex(int pos) const { return pos / block_size_; } | |
60 | |
61 int BlocksCount() const { return BlockIndex(max_size_) + 1; } | |
62 | |
63 int PosInBlock(int pos) const { return pos % block_size_; } | |
64 | |
65 const int block_size_; | |
66 const int max_size_; | |
67 ScopedVector<char*> blocks_; | |
68 int write_pos_; | |
69 int block_index_; | |
70 int block_write_pos_; | |
71 }; | |
72 | |
73 | |
74 // Functions and data for performing output of log messages. | |
75 class Log : public AllStatic { | |
76 public: | |
77 // Opens stdout for logging. | |
78 static void OpenStdout(); | |
79 | |
80 // Opens file for logging. | |
81 static void OpenFile(const char* name); | |
82 | |
83 // Opens memory buffer for logging. | |
84 static void OpenMemoryBuffer(); | |
85 | |
86 // Frees all resources acquired in Open... functions. | |
87 static void Close(); | |
88 | |
89 // See description in include/v8.h. | |
90 static int GetLogLines(int from_pos, char* dest_buf, int max_size); | |
91 | |
92 // Returns whether logging is enabled. | |
93 static bool IsEnabled() { | |
94 return output_handle_ != NULL || output_buffer_ != NULL; | |
95 } | |
96 | |
97 private: | |
98 typedef int (*WritePtr)(const char* msg, int length); | |
99 | |
100 // Initialization function called from Open... functions. | |
101 static void Init(); | |
102 | |
103 // Write functions assume that mutex_ is acquired by the caller. | |
104 static WritePtr Write; | |
105 | |
106 // Implementation of writing to a log file. | |
107 static int WriteToFile(const char* msg, int length) { | |
108 ASSERT(output_handle_ != NULL); | |
109 int rv = fwrite(msg, 1, length, output_handle_); | |
110 ASSERT(length == rv); | |
111 return rv; | |
112 } | |
113 | |
114 // Implementation of writing to a memory buffer. | |
115 static int WriteToMemory(const char* msg, int length) { | |
116 ASSERT(output_buffer_ != NULL); | |
117 return output_buffer_->Write(msg, length); | |
118 } | |
119 | |
120 // When logging is active, either output_handle_ or output_buffer_ is used | |
121 // to store a pointer to log destination. If logging was opened via OpenStdout | |
122 // or OpenFile, then output_handle_ is used. If logging was opened | |
123 // via OpenMemoryBuffer, then output_buffer_ is used. | |
124 // mutex_ should be acquired before using output_handle_ or output_buffer_. | |
125 static FILE* output_handle_; | |
126 | |
127 static LogDynamicBuffer* output_buffer_; | |
128 | |
129 // Size of dynamic buffer block (and dynamic buffer initial size). | |
130 static const int kDynamicBufferBlockSize = 65536; | |
131 | |
132 // Maximum size of dynamic buffer. | |
133 static const int kMaxDynamicBufferSize = 50 * 1024 * 1024; | |
134 | |
135 // mutex_ is a Mutex used for enforcing exclusive | |
136 // access to the formatting buffer and the log file or log memory buffer. | |
137 static Mutex* mutex_; | |
138 | |
139 // Size of buffer used for formatting log messages. | |
140 static const int kMessageBufferSize = 2048; | |
141 | |
142 // Buffer used for formatting log messages. This is a singleton buffer and | |
143 // mutex_ should be acquired before using it. | |
144 static char* message_buffer_; | |
145 | |
146 friend class LogMessageBuilder; | |
147 }; | |
148 | |
149 | |
150 // Utility class for formatting log messages. It fills the message into the | |
151 // static buffer in Log. | |
152 class LogMessageBuilder BASE_EMBEDDED { | |
153 public: | |
154 // Create a message builder starting from position 0. This acquires the mutex | |
155 // in the log as well. | |
156 explicit LogMessageBuilder(); | |
157 ~LogMessageBuilder() { } | |
158 | |
159 // Append string data to the log message. | |
160 void Append(const char* format, ...); | |
161 | |
162 // Append string data to the log message. | |
163 void Append(const char* format, va_list args); | |
164 | |
165 // Append a character to the log message. | |
166 void Append(const char c); | |
167 | |
168 // Append a heap string. | |
169 void Append(String* str); | |
170 | |
171 void AppendDetailed(String* str, bool show_impl_info); | |
172 | |
173 // Write the log message to the log file currently opened. | |
174 void WriteToLogFile(); | |
175 | |
176 // Write a null-terminated string to to the log file currently opened. | |
177 void WriteCStringToLogFile(const char* str); | |
178 | |
179 private: | |
180 ScopedLock sl; | |
181 int pos_; | |
182 }; | |
183 | |
184 #endif // ENABLE_LOGGING_AND_PROFILING | |
185 | |
186 } } // namespace v8::internal | |
187 | |
188 #endif // V8_LOG_UTILS_H_ | |
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