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1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 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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259 BasicJsonStringifier::BasicJsonStringifier(Isolate* isolate) | 259 BasicJsonStringifier::BasicJsonStringifier(Isolate* isolate) |
260 : isolate_(isolate), | 260 : isolate_(isolate), |
261 current_index_(0), | 261 current_index_(0), |
262 is_ascii_(true), | 262 is_ascii_(true), |
263 overflowed_(false) { | 263 overflowed_(false) { |
264 factory_ = isolate_->factory(); | 264 factory_ = isolate_->factory(); |
265 accumulator_store_ = Handle<JSValue>::cast( | 265 accumulator_store_ = Handle<JSValue>::cast( |
266 factory_->ToObject(factory_->empty_string())); | 266 factory_->ToObject(factory_->empty_string())); |
267 part_length_ = kInitialPartLength; | 267 part_length_ = kInitialPartLength; |
268 current_part_ = factory_->NewRawOneByteString(part_length_); | 268 current_part_ = factory_->NewRawOneByteString(part_length_); |
| 269 ASSERT(!current_part_.is_null()); |
269 tojson_string_ = factory_->toJSON_string(); | 270 tojson_string_ = factory_->toJSON_string(); |
270 stack_ = factory_->NewJSArray(8); | 271 stack_ = factory_->NewJSArray(8); |
271 } | 272 } |
272 | 273 |
273 | 274 |
274 MaybeObject* BasicJsonStringifier::Stringify(Handle<Object> object) { | 275 MaybeObject* BasicJsonStringifier::Stringify(Handle<Object> object) { |
275 switch (SerializeObject(object)) { | 276 switch (SerializeObject(object)) { |
276 case UNCHANGED: | 277 case UNCHANGED: |
277 return isolate_->heap()->undefined_value(); | 278 return isolate_->heap()->undefined_value(); |
278 case SUCCESS: { | 279 case SUCCESS: { |
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302 if (worst_case_length > 32 * KB) { // Slow path if too large. | 303 if (worst_case_length > 32 * KB) { // Slow path if too large. |
303 BasicJsonStringifier stringifier(isolate); | 304 BasicJsonStringifier stringifier(isolate); |
304 return stringifier.Stringify(object); | 305 return stringifier.Stringify(object); |
305 } | 306 } |
306 | 307 |
307 FlattenString(object); | 308 FlattenString(object); |
308 ASSERT(object->IsFlat()); | 309 ASSERT(object->IsFlat()); |
309 if (object->IsOneByteRepresentationUnderneath()) { | 310 if (object->IsOneByteRepresentationUnderneath()) { |
310 Handle<String> result = | 311 Handle<String> result = |
311 isolate->factory()->NewRawOneByteString(worst_case_length); | 312 isolate->factory()->NewRawOneByteString(worst_case_length); |
| 313 ASSERT(!result.is_null()); |
312 DisallowHeapAllocation no_gc; | 314 DisallowHeapAllocation no_gc; |
313 return StringifyString_<SeqOneByteString>( | 315 return StringifyString_<SeqOneByteString>( |
314 isolate, | 316 isolate, |
315 object->GetFlatContent().ToOneByteVector(), | 317 object->GetFlatContent().ToOneByteVector(), |
316 result); | 318 result); |
317 } else { | 319 } else { |
318 Handle<String> result = | 320 Handle<String> result = |
319 isolate->factory()->NewRawTwoByteString(worst_case_length); | 321 isolate->factory()->NewRawTwoByteString(worst_case_length); |
| 322 ASSERT(!result.is_null()); |
320 DisallowHeapAllocation no_gc; | 323 DisallowHeapAllocation no_gc; |
321 return StringifyString_<SeqTwoByteString>( | 324 return StringifyString_<SeqTwoByteString>( |
322 isolate, | 325 isolate, |
323 object->GetFlatContent().ToUC16Vector(), | 326 object->GetFlatContent().ToUC16Vector(), |
324 result); | 327 result); |
325 } | 328 } |
326 } | 329 } |
327 | 330 |
328 | 331 |
329 template <typename ResultType, typename Char> | 332 template <typename ResultType, typename Char> |
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715 void BasicJsonStringifier::ShrinkCurrentPart() { | 718 void BasicJsonStringifier::ShrinkCurrentPart() { |
716 ASSERT(current_index_ < part_length_); | 719 ASSERT(current_index_ < part_length_); |
717 current_part_ = SeqString::Truncate(Handle<SeqString>::cast(current_part_), | 720 current_part_ = SeqString::Truncate(Handle<SeqString>::cast(current_part_), |
718 current_index_); | 721 current_index_); |
719 } | 722 } |
720 | 723 |
721 | 724 |
722 void BasicJsonStringifier::Accumulate() { | 725 void BasicJsonStringifier::Accumulate() { |
723 if (accumulator()->length() + current_part_->length() > String::kMaxLength) { | 726 if (accumulator()->length() + current_part_->length() > String::kMaxLength) { |
724 // Screw it. Simply set the flag and carry on. Throw exception at the end. | 727 // Screw it. Simply set the flag and carry on. Throw exception at the end. |
725 // We most likely will trigger a real OOM before even reaching this point. | |
726 set_accumulator(factory_->empty_string()); | 728 set_accumulator(factory_->empty_string()); |
727 overflowed_ = true; | 729 overflowed_ = true; |
728 } else { | 730 } else { |
729 set_accumulator(factory_->NewConsString(accumulator(), current_part_)); | 731 set_accumulator(factory_->NewConsString(accumulator(), current_part_)); |
730 } | 732 } |
731 } | 733 } |
732 | 734 |
733 | 735 |
734 void BasicJsonStringifier::Extend() { | 736 void BasicJsonStringifier::Extend() { |
735 Accumulate(); | 737 Accumulate(); |
736 if (part_length_ <= kMaxPartLength / kPartLengthGrowthFactor) { | 738 if (part_length_ <= kMaxPartLength / kPartLengthGrowthFactor) { |
737 part_length_ *= kPartLengthGrowthFactor; | 739 part_length_ *= kPartLengthGrowthFactor; |
738 } | 740 } |
739 if (is_ascii_) { | 741 if (is_ascii_) { |
740 current_part_ = factory_->NewRawOneByteString(part_length_); | 742 current_part_ = factory_->NewRawOneByteString(part_length_); |
741 } else { | 743 } else { |
742 current_part_ = factory_->NewRawTwoByteString(part_length_); | 744 current_part_ = factory_->NewRawTwoByteString(part_length_); |
743 } | 745 } |
| 746 ASSERT(!current_part_.is_null()); |
744 current_index_ = 0; | 747 current_index_ = 0; |
745 } | 748 } |
746 | 749 |
747 | 750 |
748 void BasicJsonStringifier::ChangeEncoding() { | 751 void BasicJsonStringifier::ChangeEncoding() { |
749 ShrinkCurrentPart(); | 752 ShrinkCurrentPart(); |
750 Accumulate(); | 753 Accumulate(); |
751 current_part_ = factory_->NewRawTwoByteString(part_length_); | 754 current_part_ = factory_->NewRawTwoByteString(part_length_); |
| 755 ASSERT(!current_part_.is_null()); |
752 current_index_ = 0; | 756 current_index_ = 0; |
753 is_ascii_ = false; | 757 is_ascii_ = false; |
754 } | 758 } |
755 | 759 |
756 | 760 |
757 template <typename SrcChar, typename DestChar> | 761 template <typename SrcChar, typename DestChar> |
758 int BasicJsonStringifier::SerializeStringUnchecked_(const SrcChar* src, | 762 int BasicJsonStringifier::SerializeStringUnchecked_(const SrcChar* src, |
759 DestChar* dest, | 763 DestChar* dest, |
760 int length) { | 764 int length) { |
761 DestChar* dest_start = dest; | 765 DestChar* dest_start = dest; |
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870 SerializeString_<false, uint8_t>(object); | 874 SerializeString_<false, uint8_t>(object); |
871 } else { | 875 } else { |
872 SerializeString_<false, uc16>(object); | 876 SerializeString_<false, uc16>(object); |
873 } | 877 } |
874 } | 878 } |
875 } | 879 } |
876 | 880 |
877 } } // namespace v8::internal | 881 } } // namespace v8::internal |
878 | 882 |
879 #endif // V8_JSON_STRINGIFIER_H_ | 883 #endif // V8_JSON_STRINGIFIER_H_ |
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