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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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660 cs->set_first(result); | 660 cs->set_first(result); |
661 cs->set_second(Heap::empty_string()); | 661 cs->set_second(Heap::empty_string()); |
662 return this; | 662 return this; |
663 } | 663 } |
664 default: | 664 default: |
665 return this; | 665 return this; |
666 } | 666 } |
667 } | 667 } |
668 | 668 |
669 | 669 |
| 670 bool String::MakeExternal(v8::String::ExternalStringResource* resource) { |
| 671 #ifdef DEBUG |
| 672 { // NOLINT (presubmit.py gets confused about if and braces) |
| 673 // Assert that the resource and the string are equivalent. |
| 674 ASSERT(static_cast<size_t>(this->length()) == resource->length()); |
| 675 SmartPointer<uc16> smart_chars = this->ToWideCString(); |
| 676 ASSERT(memcmp(*smart_chars, |
| 677 resource->data(), |
| 678 resource->length()*sizeof(**smart_chars)) == 0); |
| 679 } |
| 680 #endif // DEBUG |
| 681 |
| 682 int size = this->Size(); // Byte size of the original string. |
| 683 if (size < ExternalString::kSize) { |
| 684 // The string is too small to fit an external String in its place. This can |
| 685 // only happen for zero length strings. |
| 686 return false; |
| 687 } |
| 688 ASSERT(size >= ExternalString::kSize); |
| 689 bool is_symbol = this->IsSymbol(); |
| 690 int length = this->length(); |
| 691 |
| 692 // Morph the object to an external string by adjusting the map and |
| 693 // reinitializing the fields. |
| 694 this->set_map(ExternalTwoByteString::StringMap(length)); |
| 695 ExternalTwoByteString* self = ExternalTwoByteString::cast(this); |
| 696 self->set_length(length); |
| 697 self->set_resource(resource); |
| 698 // Additionally make the object into an external symbol if the original string |
| 699 // was a symbol to start with. |
| 700 if (is_symbol) { |
| 701 self->Hash(); // Force regeneration of the hash value. |
| 702 // Now morph this external string into a external symbol. |
| 703 self->set_map(ExternalTwoByteString::SymbolMap(length)); |
| 704 } |
| 705 |
| 706 // Fill the remainder of the string with dead wood. |
| 707 int new_size = this->Size(); // Byte size of the external String object. |
| 708 Heap::CreateFillerObjectAt(this->address() + new_size, size - new_size); |
| 709 return true; |
| 710 } |
| 711 |
| 712 |
| 713 bool String::MakeExternal(v8::String::ExternalAsciiStringResource* resource) { |
| 714 #ifdef DEBUG |
| 715 { // NOLINT (presubmit.py gets confused about if and braces) |
| 716 // Assert that the resource and the string are equivalent. |
| 717 ASSERT(static_cast<size_t>(this->length()) == resource->length()); |
| 718 SmartPointer<char> smart_chars = this->ToCString(); |
| 719 ASSERT(memcmp(*smart_chars, |
| 720 resource->data(), |
| 721 resource->length()*sizeof(**smart_chars)) == 0); |
| 722 } |
| 723 #endif // DEBUG |
| 724 |
| 725 int size = this->Size(); // Byte size of the original string. |
| 726 if (size < ExternalString::kSize) { |
| 727 // The string is too small to fit an external String in its place. This can |
| 728 // only happen for zero length strings. |
| 729 return false; |
| 730 } |
| 731 ASSERT(size >= ExternalString::kSize); |
| 732 bool is_symbol = this->IsSymbol(); |
| 733 int length = this->length(); |
| 734 |
| 735 // Morph the object to an external string by adjusting the map and |
| 736 // reinitializing the fields. |
| 737 this->set_map(ExternalAsciiString::StringMap(length)); |
| 738 ExternalAsciiString* self = ExternalAsciiString::cast(this); |
| 739 self->set_length(length); |
| 740 self->set_resource(resource); |
| 741 // Additionally make the object into an external symbol if the original string |
| 742 // was a symbol to start with. |
| 743 if (is_symbol) { |
| 744 self->Hash(); // Force regeneration of the hash value. |
| 745 // Now morph this external string into a external symbol. |
| 746 self->set_map(ExternalAsciiString::SymbolMap(length)); |
| 747 } |
| 748 |
| 749 // Fill the remainder of the string with dead wood. |
| 750 int new_size = this->Size(); // Byte size of the external String object. |
| 751 Heap::CreateFillerObjectAt(this->address() + new_size, size - new_size); |
| 752 return true; |
| 753 } |
| 754 |
| 755 |
670 void String::StringShortPrint(StringStream* accumulator) { | 756 void String::StringShortPrint(StringStream* accumulator) { |
671 StringShape shape(this); | 757 StringShape shape(this); |
672 int len = length(shape); | 758 int len = length(shape); |
673 if (len > kMaxMediumStringSize) { | 759 if (len > kMaxMediumStringSize) { |
674 accumulator->Add("<Very long string[%u]>", len); | 760 accumulator->Add("<Very long string[%u]>", len); |
675 return; | 761 return; |
676 } | 762 } |
677 | 763 |
678 if (!LooksValid()) { | 764 if (!LooksValid()) { |
679 accumulator->Add("<Invalid String>"); | 765 accumulator->Add("<Invalid String>"); |
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1920 | 2006 |
1921 // Copy the next enumeration index from instance descriptor. | 2007 // Copy the next enumeration index from instance descriptor. |
1922 int index = map()->instance_descriptors()->NextEnumerationIndex(); | 2008 int index = map()->instance_descriptors()->NextEnumerationIndex(); |
1923 dictionary->SetNextEnumerationIndex(index); | 2009 dictionary->SetNextEnumerationIndex(index); |
1924 | 2010 |
1925 // Allocate new map. | 2011 // Allocate new map. |
1926 obj = map()->Copy(); | 2012 obj = map()->Copy(); |
1927 if (obj->IsFailure()) return obj; | 2013 if (obj->IsFailure()) return obj; |
1928 Map* new_map = Map::cast(obj); | 2014 Map* new_map = Map::cast(obj); |
1929 | 2015 |
1930 // Clear inobject properties if needed by adjusting the instance | 2016 // Clear inobject properties if needed by adjusting the instance size and |
1931 // size and putting in a filler or byte array instead of the | 2017 // putting in a filler object instead of the inobject properties. |
1932 // inobject properties. | |
1933 if (mode == CLEAR_INOBJECT_PROPERTIES && map()->inobject_properties() > 0) { | 2018 if (mode == CLEAR_INOBJECT_PROPERTIES && map()->inobject_properties() > 0) { |
1934 int instance_size_delta = map()->inobject_properties() * kPointerSize; | 2019 int instance_size_delta = map()->inobject_properties() * kPointerSize; |
1935 int new_instance_size = map()->instance_size() - instance_size_delta; | 2020 int new_instance_size = map()->instance_size() - instance_size_delta; |
1936 new_map->set_inobject_properties(0); | 2021 new_map->set_inobject_properties(0); |
1937 new_map->set_instance_size(new_instance_size); | 2022 new_map->set_instance_size(new_instance_size); |
1938 if (instance_size_delta == kPointerSize) { | 2023 Heap::CreateFillerObjectAt(this->address() + new_instance_size, |
1939 WRITE_FIELD(this, new_instance_size, Heap::one_word_filler_map()); | 2024 instance_size_delta); |
1940 } else { | |
1941 int byte_array_length = ByteArray::LengthFor(instance_size_delta); | |
1942 int byte_array_length_offset = new_instance_size + kPointerSize; | |
1943 WRITE_FIELD(this, new_instance_size, Heap::byte_array_map()); | |
1944 WRITE_INT_FIELD(this, byte_array_length_offset, byte_array_length); | |
1945 } | |
1946 WRITE_BARRIER(this, new_instance_size); | |
1947 } | 2025 } |
1948 new_map->set_unused_property_fields(0); | 2026 new_map->set_unused_property_fields(0); |
1949 | 2027 |
1950 // We have now successfully allocated all the necessary objects. | 2028 // We have now successfully allocated all the necessary objects. |
1951 // Changes can now be made with the guarantee that all of them take effect. | 2029 // Changes can now be made with the guarantee that all of them take effect. |
1952 set_map(new_map); | 2030 set_map(new_map); |
1953 map()->set_instance_descriptors(Heap::empty_descriptor_array()); | 2031 map()->set_instance_descriptors(Heap::empty_descriptor_array()); |
1954 | 2032 |
1955 set_properties(dictionary); | 2033 set_properties(dictionary); |
1956 | 2034 |
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7077 // No break point. | 7155 // No break point. |
7078 if (break_point_objects()->IsUndefined()) return 0; | 7156 if (break_point_objects()->IsUndefined()) return 0; |
7079 // Single beak point. | 7157 // Single beak point. |
7080 if (!break_point_objects()->IsFixedArray()) return 1; | 7158 if (!break_point_objects()->IsFixedArray()) return 1; |
7081 // Multiple break points. | 7159 // Multiple break points. |
7082 return FixedArray::cast(break_point_objects())->length(); | 7160 return FixedArray::cast(break_point_objects())->length(); |
7083 } | 7161 } |
7084 | 7162 |
7085 | 7163 |
7086 } } // namespace v8::internal | 7164 } } // namespace v8::internal |
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