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1 // Copyright 2006-2008 the V8 project authors. All rights reserved. | 1 // Copyright 2006-2008 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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75 int predata_function_skip() { return backing_[kPredataFunctionSkipOffset]; } | 75 int predata_function_skip() { return backing_[kPredataFunctionSkipOffset]; } |
76 void set_predata_function_skip(int value) { | 76 void set_predata_function_skip(int value) { |
77 backing_[kPredataFunctionSkipOffset] = value; | 77 backing_[kPredataFunctionSkipOffset] = value; |
78 } | 78 } |
79 | 79 |
80 int predata_symbol_skip() { return backing_[kPredataSymbolSkipOffset]; } | 80 int predata_symbol_skip() { return backing_[kPredataSymbolSkipOffset]; } |
81 void set_predata_symbol_skip(int value) { | 81 void set_predata_symbol_skip(int value) { |
82 backing_[kPredataSymbolSkipOffset] = value; | 82 backing_[kPredataSymbolSkipOffset] = value; |
83 } | 83 } |
84 | 84 |
85 int symbol_id_skip() { return backing_[kSymbolIdSkipOffset]; } | |
86 void set_symbol_id_skip(int value) { | |
87 backing_[kSymbolIdSkipOffset] = value; | |
88 } | |
89 | |
90 | |
91 bool is_valid() { return backing_.length() > 0; } | 85 bool is_valid() { return backing_.length() > 0; } |
92 | 86 |
93 static const int kSize = 7; | 87 static const int kSize = 6; |
94 | 88 |
95 private: | 89 private: |
96 Vector<unsigned> backing_; | 90 Vector<unsigned> backing_; |
97 static const int kStartPosOffset = 0; | 91 static const int kStartPosOffset = 0; |
98 static const int kEndPosOffset = 1; | 92 static const int kEndPosOffset = 1; |
99 static const int kLiteralCountOffset = 2; | 93 static const int kLiteralCountOffset = 2; |
100 static const int kPropertyCountOffset = 3; | 94 static const int kPropertyCountOffset = 3; |
101 static const int kPredataFunctionSkipOffset = 4; | 95 static const int kPredataFunctionSkipOffset = 4; |
102 static const int kPredataSymbolSkipOffset = 5; | 96 static const int kPredataSymbolSkipOffset = 5; |
103 static const int kSymbolIdSkipOffset = 6; | |
104 }; | 97 }; |
105 | 98 |
106 | 99 |
107 class ScriptDataImpl : public ScriptData { | 100 class ScriptDataImpl : public ScriptData { |
108 public: | 101 public: |
109 explicit ScriptDataImpl(Vector<unsigned> store) | 102 explicit ScriptDataImpl(Vector<unsigned> store) |
110 : store_(store), | 103 : store_(store), |
111 function_index_(kHeaderSize), | 104 function_index_(kHeaderSize), |
112 symbol_id_(0), | |
113 owns_store_(true) { | 105 owns_store_(true) { |
114 Initialize(); | 106 Initialize(); |
115 } | 107 } |
116 | 108 |
117 void Initialize() { | |
118 if (store_.length() >= kHeaderSize) { | |
119 // Otherwise we won't satisfy the SanityCheck. | |
120 symbol_index_ = kHeaderSize + store_[kFunctionsSizeOffset]; | |
121 } | |
122 } | |
123 | |
124 // Create an empty ScriptDataImpl that is guaranteed to not satisfy | 109 // Create an empty ScriptDataImpl that is guaranteed to not satisfy |
125 // a SanityCheck. | 110 // a SanityCheck. |
126 ScriptDataImpl() : store_(Vector<unsigned>()), owns_store_(false) { } | 111 ScriptDataImpl() : store_(Vector<unsigned>()), owns_store_(false) { } |
127 | 112 |
128 virtual ~ScriptDataImpl(); | 113 virtual ~ScriptDataImpl(); |
129 virtual int Length(); | 114 virtual int Length(); |
130 virtual const char* Data(); | 115 virtual const char* Data(); |
131 virtual bool HasError(); | 116 virtual bool HasError(); |
132 | 117 |
| 118 void Initialize(); |
| 119 void ReadNextSymbolPosition(); |
| 120 |
133 FunctionEntry GetFunctionEntry(int start); | 121 FunctionEntry GetFunctionEntry(int start); |
134 int GetSymbolIdentifier(int start); | 122 int GetSymbolIdentifier(); |
135 void SkipFunctionEntry(int start); | 123 void SkipFunctionEntry(int start); |
136 bool SanityCheck(); | 124 bool SanityCheck(); |
137 | 125 |
138 Scanner::Location MessageLocation(); | 126 Scanner::Location MessageLocation(); |
139 const char* BuildMessage(); | 127 const char* BuildMessage(); |
140 Vector<const char*> BuildArgs(); | 128 Vector<const char*> BuildArgs(); |
141 | 129 |
142 int symbol_count() { | 130 int symbol_count() { |
143 return (store_.length() > kHeaderSize) ? store_[kSymbolCountOffset] : 0; | 131 return (store_.length() > kHeaderSize) ? store_[kSymbolCountOffset] : 0; |
144 } | 132 } |
145 // The following functions should only be called if SanityCheck has | 133 // The following functions should only be called if SanityCheck has |
146 // returned true. | 134 // returned true. |
147 bool has_error() { return store_[kHasErrorOffset]; } | 135 bool has_error() { return store_[kHasErrorOffset]; } |
148 unsigned magic() { return store_[kMagicOffset]; } | 136 unsigned magic() { return store_[kMagicOffset]; } |
149 unsigned version() { return store_[kVersionOffset]; } | 137 unsigned version() { return store_[kVersionOffset]; } |
150 | 138 |
151 // Skip forward in the preparser data by the given number | 139 // Skip forward in the preparser data by the given number |
152 // of unsigned ints. | 140 // of unsigned ints of function entries and the given number of bytes of |
153 virtual void Skip(int function_entries, int symbol_entries, int symbol_ids) { | 141 // symbol id encoding. |
| 142 void Skip(int function_entries, int symbol_entries) { |
154 ASSERT(function_entries >= 0); | 143 ASSERT(function_entries >= 0); |
155 ASSERT(function_entries | 144 ASSERT(function_entries |
156 <= (static_cast<int>(store_[kFunctionsSizeOffset]) | 145 <= (static_cast<int>(store_[kFunctionsSizeOffset]) |
157 - (function_index_ - kHeaderSize))); | 146 - (function_index_ - kHeaderSize))); |
158 function_index_ += function_entries; | 147 ASSERT(symbol_entries >= 0); |
159 symbol_index_ += symbol_entries; | 148 ASSERT(symbol_entries <= symbol_data_end_ - symbol_data_); |
160 symbol_id_ += symbol_ids; | 149 |
| 150 unsigned max_function_skip = store_[kFunctionsSizeOffset] - |
| 151 static_cast<unsigned>(function_index_ - kHeaderSize); |
| 152 function_index_ += |
| 153 Min(static_cast<unsigned>(function_entries), max_function_skip); |
| 154 symbol_data_ += |
| 155 Min(static_cast<unsigned>(symbol_entries), |
| 156 static_cast<unsigned>(symbol_data_end_ - symbol_data_)); |
161 } | 157 } |
162 | 158 |
163 static const unsigned kMagicNumber = 0xBadDead; | 159 static const unsigned kMagicNumber = 0xBadDead; |
164 static const unsigned kCurrentVersion = 2; | 160 static const unsigned kCurrentVersion = 3; |
165 | 161 |
166 static const int kMagicOffset = 0; | 162 static const int kMagicOffset = 0; |
167 static const int kVersionOffset = 1; | 163 static const int kVersionOffset = 1; |
168 static const int kHasErrorOffset = 2; | 164 static const int kHasErrorOffset = 2; |
169 static const int kFunctionsSizeOffset = 3; | 165 static const int kFunctionsSizeOffset = 3; |
170 static const int kSymbolCountOffset = 4; | 166 static const int kSymbolCountOffset = 4; |
171 static const int kSizeOffset = 5; | 167 static const int kSizeOffset = 5; |
172 static const int kHeaderSize = 6; | 168 static const int kHeaderSize = 6; |
173 | 169 |
| 170 // If encoding a message, the following positions are fixed. |
174 static const int kMessageStartPos = 0; | 171 static const int kMessageStartPos = 0; |
175 static const int kMessageEndPos = 1; | 172 static const int kMessageEndPos = 1; |
176 static const int kMessageArgCountPos = 2; | 173 static const int kMessageArgCountPos = 2; |
177 static const int kMessageTextPos = 3; | 174 static const int kMessageTextPos = 3; |
178 | 175 |
| 176 static const byte kNumberTerminator = 0x80u; |
| 177 |
179 private: | 178 private: |
180 Vector<unsigned> store_; | 179 Vector<unsigned> store_; |
| 180 unsigned char* symbol_data_; |
| 181 unsigned char* symbol_data_end_; |
181 int function_index_; | 182 int function_index_; |
182 int symbol_index_; | |
183 int symbol_id_; | |
184 bool owns_store_; | 183 bool owns_store_; |
185 | 184 |
186 unsigned Read(int position); | 185 unsigned Read(int position); |
187 unsigned* ReadAddress(int position); | 186 unsigned* ReadAddress(int position); |
| 187 // Reads a number from the current symbols |
| 188 int ReadNumber(byte** source); |
188 | 189 |
189 ScriptDataImpl(const char* backing_store, int length) | 190 ScriptDataImpl(const char* backing_store, int length) |
190 : store_(reinterpret_cast<unsigned*>(const_cast<char*>(backing_store)), | 191 : store_(reinterpret_cast<unsigned*>(const_cast<char*>(backing_store)), |
191 length / sizeof(unsigned)), | 192 length / sizeof(unsigned)), |
192 function_index_(kHeaderSize), | 193 function_index_(kHeaderSize), |
193 symbol_id_(0), | |
194 owns_store_(false) { | 194 owns_store_(false) { |
195 ASSERT_EQ(0, reinterpret_cast<intptr_t>(backing_store) % sizeof(unsigned)); | 195 ASSERT_EQ(0, reinterpret_cast<intptr_t>(backing_store) % sizeof(unsigned)); |
196 Initialize(); | 196 Initialize(); |
197 } | 197 } |
198 | 198 |
199 // Read strings written by ParserRecorder::WriteString. | 199 // Read strings written by ParserRecorder::WriteString. |
200 static const char* ReadString(unsigned* start, int* chars); | 200 static const char* ReadString(unsigned* start, int* chars); |
201 | 201 |
202 friend class ScriptData; | 202 friend class ScriptData; |
203 }; | 203 }; |
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272 static const int kTypeSlot = 0; | 272 static const int kTypeSlot = 0; |
273 static const int kElementsSlot = 1; | 273 static const int kElementsSlot = 1; |
274 | 274 |
275 DISALLOW_IMPLICIT_CONSTRUCTORS(CompileTimeValue); | 275 DISALLOW_IMPLICIT_CONSTRUCTORS(CompileTimeValue); |
276 }; | 276 }; |
277 | 277 |
278 | 278 |
279 } } // namespace v8::internal | 279 } } // namespace v8::internal |
280 | 280 |
281 #endif // V8_PARSER_H_ | 281 #endif // V8_PARSER_H_ |
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