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| 1 // Copyright 2006-2009 the V8 project authors. All rights reserved. | 1 // Copyright 2006-2009 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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| 166 f(14, 32) \ | 166 f(14, 32) \ |
| 167 f(15, 36) | 167 f(15, 36) |
| 168 | 168 |
| 169 // The Serializer/Deserializer class is a common superclass for Serializer and | 169 // The Serializer/Deserializer class is a common superclass for Serializer and |
| 170 // Deserializer which is used to store common constants and methods used by | 170 // Deserializer which is used to store common constants and methods used by |
| 171 // both. | 171 // both. |
| 172 class SerializerDeserializer: public ObjectVisitor { | 172 class SerializerDeserializer: public ObjectVisitor { |
| 173 public: | 173 public: |
| 174 static void Iterate(ObjectVisitor* visitor); | 174 static void Iterate(ObjectVisitor* visitor); |
| 175 static void SetSnapshotCacheSize(int size); | 175 static void SetSnapshotCacheSize(int size); |
| 176 #ifdef DEBUG | |
| 177 static void StartTracing() { tracing_ = true; } | |
| 178 static void StopTracing() { tracing_ = false; } | |
| 179 static void Trace(const char *msg, int arg) { if (tracing_) printf("%s %d\n",
msg, arg); } | |
| 180 static void Trace(const char *msg, const char* arg) { if (tracing_) printf("%s
%s\n", msg, arg); } | |
| 181 static void Trace(const char *msg, const char* arg1, int arg2) { if (tracing_)
printf("%s %s %d\n", msg, arg1, arg2); } | |
| 182 static bool tracing() { return tracing_; } | |
| 183 #else | |
| 184 static void StartTracing() { } | |
| 185 static void StopTracing() { } | |
| 186 static void Trace(const char *msg, int arg) { } | |
| 187 static void Trace(const char *msg, const char* arg) { } | |
| 188 static void Trace(const char *msg, const char* arg1, int arg2) { } | |
| 189 static bool tracing() { return false; } | |
| 190 #endif | |
| 191 | 176 |
| 192 protected: | 177 protected: |
| 193 enum DataType { | 178 enum DataType { |
| 194 RAW_DATA_SERIALIZATION = 0, | 179 RAW_DATA_SERIALIZATION = 0, |
| 195 // And 15 common raw lengths. | 180 // And 15 common raw lengths. |
| 196 OBJECT_SERIALIZATION = 16, | 181 OBJECT_SERIALIZATION = 16, |
| 197 // One variant per space. | 182 // One variant per space. |
| 198 CODE_OBJECT_SERIALIZATION = 25, | 183 CODE_OBJECT_SERIALIZATION = 25, |
| 199 // One per space (only code spaces in use). | 184 // One per space (only code spaces in use). |
| 200 EXTERNAL_REFERENCE_SERIALIZATION = 34, | 185 EXTERNAL_REFERENCE_SERIALIZATION = 34, |
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| 226 static const int kSpaceMask = 15; | 211 static const int kSpaceMask = 15; |
| 227 | 212 |
| 228 static inline bool SpaceIsLarge(int space) { return space >= kLargeData; } | 213 static inline bool SpaceIsLarge(int space) { return space >= kLargeData; } |
| 229 static inline bool SpaceIsPaged(int space) { | 214 static inline bool SpaceIsPaged(int space) { |
| 230 return space >= FIRST_PAGED_SPACE && space <= LAST_PAGED_SPACE; | 215 return space >= FIRST_PAGED_SPACE && space <= LAST_PAGED_SPACE; |
| 231 } | 216 } |
| 232 | 217 |
| 233 static int partial_snapshot_cache_length_; | 218 static int partial_snapshot_cache_length_; |
| 234 static const int kPartialSnapshotCacheCapacity = 1300; | 219 static const int kPartialSnapshotCacheCapacity = 1300; |
| 235 static Object* partial_snapshot_cache_[]; | 220 static Object* partial_snapshot_cache_[]; |
| 236 static bool tracing_; | |
| 237 }; | 221 }; |
| 238 | 222 |
| 239 | 223 |
| 240 int SnapshotByteSource::GetInt() { | 224 int SnapshotByteSource::GetInt() { |
| 241 // A little unwind to catch the really small ints. | 225 // A little unwind to catch the really small ints. |
| 242 int snapshot_byte = Get(); | 226 int snapshot_byte = Get(); |
| 243 if ((snapshot_byte & 0x80) == 0) { | 227 if ((snapshot_byte & 0x80) == 0) { |
| 244 SerializerDeserializer::Trace("Tag IntLastPart", snapshot_byte); | |
| 245 return snapshot_byte; | 228 return snapshot_byte; |
| 246 } | 229 } |
| 247 SerializerDeserializer::Trace("Tag IntPart", snapshot_byte); | |
| 248 int accumulator = (snapshot_byte & 0x7f) << 7; | 230 int accumulator = (snapshot_byte & 0x7f) << 7; |
| 249 while (true) { | 231 while (true) { |
| 250 snapshot_byte = Get(); | 232 snapshot_byte = Get(); |
| 251 if ((snapshot_byte & 0x80) == 0) { | 233 if ((snapshot_byte & 0x80) == 0) { |
| 252 SerializerDeserializer::Trace("Tag IntLastPart", snapshot_byte); | |
| 253 return accumulator | snapshot_byte; | 234 return accumulator | snapshot_byte; |
| 254 } | 235 } |
| 255 SerializerDeserializer::Trace("Tag IntPart", snapshot_byte); | |
| 256 accumulator = (accumulator | (snapshot_byte & 0x7f)) << 7; | 236 accumulator = (accumulator | (snapshot_byte & 0x7f)) << 7; |
| 257 } | 237 } |
| 258 UNREACHABLE(); | 238 UNREACHABLE(); |
| 259 return accumulator; | 239 return accumulator; |
| 260 } | 240 } |
| 261 | 241 |
| 262 | 242 |
| 263 void SnapshotByteSource::CopyRaw(byte* to, int number_of_bytes) { | 243 void SnapshotByteSource::CopyRaw(byte* to, int number_of_bytes) { |
| 264 if (SerializerDeserializer::tracing()) { | |
| 265 for (int i = 0; i < number_of_bytes; i++) { | |
| 266 SerializerDeserializer::Trace("Tag Byte", data_[position_ + i]); | |
| 267 } | |
| 268 } | |
| 269 memcpy(to, data_ + position_, number_of_bytes); | 244 memcpy(to, data_ + position_, number_of_bytes); |
| 270 position_ += number_of_bytes; | 245 position_ += number_of_bytes; |
| 271 } | 246 } |
| 272 | 247 |
| 273 | 248 |
| 274 // A Deserializer reads a snapshot and reconstructs the Object graph it defines. | 249 // A Deserializer reads a snapshot and reconstructs the Object graph it defines. |
| 275 class Deserializer: public SerializerDeserializer { | 250 class Deserializer: public SerializerDeserializer { |
| 276 public: | 251 public: |
| 277 // Create a deserializer from a snapshot byte source. | 252 // Create a deserializer from a snapshot byte source. |
| 278 explicit Deserializer(SnapshotByteSource* source); | 253 explicit Deserializer(SnapshotByteSource* source); |
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| 557 virtual int RootIndex(HeapObject* o) { return kInvalidRootIndex; } | 532 virtual int RootIndex(HeapObject* o) { return kInvalidRootIndex; } |
| 558 virtual bool ShouldBeInThePartialSnapshotCache(HeapObject* o) { | 533 virtual bool ShouldBeInThePartialSnapshotCache(HeapObject* o) { |
| 559 return false; | 534 return false; |
| 560 } | 535 } |
| 561 }; | 536 }; |
| 562 | 537 |
| 563 | 538 |
| 564 } } // namespace v8::internal | 539 } } // namespace v8::internal |
| 565 | 540 |
| 566 #endif // V8_SERIALIZE_H_ | 541 #endif // V8_SERIALIZE_H_ |
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