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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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4063 void StringPrint(); | 4063 void StringPrint(); |
4064 void StringVerify(); | 4064 void StringVerify(); |
4065 #endif | 4065 #endif |
4066 inline bool IsFlat(); | 4066 inline bool IsFlat(); |
4067 | 4067 |
4068 // Layout description. | 4068 // Layout description. |
4069 static const int kLengthOffset = HeapObject::kHeaderSize; | 4069 static const int kLengthOffset = HeapObject::kHeaderSize; |
4070 static const int kSize = kLengthOffset + kIntSize; | 4070 static const int kSize = kLengthOffset + kIntSize; |
4071 // Notice: kSize is not pointer-size aligned if pointers are 64-bit. | 4071 // Notice: kSize is not pointer-size aligned if pointers are 64-bit. |
4072 | 4072 |
4073 // Limits on sizes of different types of strings. | 4073 // Maximum number of characters to consider when trying to convert a string |
4074 static const int kMaxShortStringSize = 63; | 4074 // value into an array index. |
4075 static const int kMaxMediumStringSize = 16383; | |
4076 | |
4077 static const int kMaxArrayIndexSize = 10; | 4075 static const int kMaxArrayIndexSize = 10; |
4078 | 4076 |
4079 // Max ascii char code. | 4077 // Max ascii char code. |
4080 static const int kMaxAsciiCharCode = unibrow::Utf8::kMaxOneByteChar; | 4078 static const int kMaxAsciiCharCode = unibrow::Utf8::kMaxOneByteChar; |
4081 static const unsigned kMaxAsciiCharCodeU = unibrow::Utf8::kMaxOneByteChar; | 4079 static const unsigned kMaxAsciiCharCodeU = unibrow::Utf8::kMaxOneByteChar; |
4082 static const int kMaxUC16CharCode = 0xffff; | 4080 static const int kMaxUC16CharCode = 0xffff; |
4083 | 4081 |
4084 // Minimum length for a cons or sliced string. | 4082 // Minimum length for a cons or sliced string. |
4085 static const int kMinNonFlatLength = 13; | 4083 static const int kMinNonFlatLength = 13; |
4086 | 4084 |
4087 // Mask constant for checking if a string has a computed hash code | 4085 // Mask constant for checking if a string has a computed hash code |
4088 // and if it is an array index. The least significant bit indicates | 4086 // and if it is an array index. The least significant bit indicates |
4089 // whether a hash code has been computed. If the hash code has been | 4087 // whether a hash code has been computed. If the hash code has been |
4090 // computed the 2nd bit tells whether the string can be used as an | 4088 // computed the 2nd bit tells whether the string can be used as an |
4091 // array index. | 4089 // array index. |
4092 static const int kHashComputedMask = 1; | 4090 static const int kHashComputedMask = 1; |
4093 static const int kIsArrayIndexMask = 1 << 1; | 4091 static const int kIsArrayIndexMask = 1 << 1; |
4094 static const int kNofLengthBitFields = 2; | 4092 static const int kNofLengthBitFields = 2; |
4095 | 4093 |
4096 // Array index strings this short can keep their index in the hash | 4094 // Array index strings this short can keep their index in the hash |
4097 // field. | 4095 // field. |
4098 static const int kMaxCachedArrayIndexLength = 7; | 4096 static const int kMaxCachedArrayIndexLength = 7; |
4099 | 4097 |
4100 // Shift constants for retriving length and hash code from | 4098 // Shift constants for retrieving length and hash code from |
4101 // length/hash field. | 4099 // length/hash field. |
4102 static const int kHashShift = kNofLengthBitFields; | 4100 static const int kHashShift = kNofLengthBitFields; |
4103 static const int kShortLengthShift = kHashShift + kShortStringTag; | 4101 static const int kShortLengthShift = kHashShift + kShortStringTag; |
4104 static const int kMediumLengthShift = kHashShift + kMediumStringTag; | 4102 static const int kMediumLengthShift = kHashShift + kMediumStringTag; |
4105 static const int kLongLengthShift = kHashShift + kLongStringTag; | 4103 static const int kLongLengthShift = kHashShift + kLongStringTag; |
4106 // Maximal string length that can be stored in the hash/length field. | 4104 |
| 4105 // Maximal string length that can be stored in the hash/length field for |
| 4106 // different types of strings. |
| 4107 static const int kMaxShortSize = (1 << (32 - kShortLengthShift)) - 1; |
| 4108 static const int kMaxMediumSize = (1 << (32 - kMediumLengthShift)) - 1; |
4107 static const int kMaxLength = (1 << (32 - kLongLengthShift)) - 1; | 4109 static const int kMaxLength = (1 << (32 - kLongLengthShift)) - 1; |
4108 | 4110 |
4109 // Limit for truncation in short printing. | 4111 // Limit for truncation in short printing. |
4110 static const int kMaxShortPrintLength = 1024; | 4112 static const int kMaxShortPrintLength = 1024; |
4111 | 4113 |
4112 // Support for regular expressions. | 4114 // Support for regular expressions. |
4113 const uc16* GetTwoByteData(); | 4115 const uc16* GetTwoByteData(); |
4114 const uc16* GetTwoByteData(unsigned start); | 4116 const uc16* GetTwoByteData(unsigned start); |
4115 | 4117 |
4116 // Support for StringInputBuffer | 4118 // Support for StringInputBuffer |
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5144 } else { | 5146 } else { |
5145 value &= ~(1 << bit_position); | 5147 value &= ~(1 << bit_position); |
5146 } | 5148 } |
5147 return value; | 5149 return value; |
5148 } | 5150 } |
5149 }; | 5151 }; |
5150 | 5152 |
5151 } } // namespace v8::internal | 5153 } } // namespace v8::internal |
5152 | 5154 |
5153 #endif // V8_OBJECTS_H_ | 5155 #endif // V8_OBJECTS_H_ |
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